53 files changed, 1671 insertions, 1475 deletions

diff --git a/drivers/usb/gadget/Kconfig b/drivers/usb/gadget/Kconfig
index 14625fd2cecd..6665d255d32a 100644
--- a/drivers/usb/gadget/Kconfig
+++ b/drivers/usb/gadget/Kconfig
@@ -500,6 +500,15 @@ config USB_LIBCOMPOSITE
         tristate
         depends on USB_GADGET
 
+config USB_F_ACM
+        tristate
+
+config USB_F_SS_LB
+        tristate
+
+config USB_U_SERIAL
+        tristate
+
 choice
         tristate "USB Gadget Drivers"
         default USB_ETH
@@ -524,6 +533,7 @@ choice
 config USB_ZERO
         tristate "Gadget Zero (DEVELOPMENT)"
         select USB_LIBCOMPOSITE
+        select USB_F_SS_LB
         help
           Gadget Zero is a two-configuration device.  It either sinks and
           sources bulk data; or it loops back a configurable number of
@@ -750,6 +760,8 @@ config USB_GADGET_TARGET
 
 config USB_G_SERIAL
         tristate "Serial Gadget (with CDC ACM and CDC OBEX support)"
+        select USB_U_SERIAL
+        select USB_F_ACM
         select USB_LIBCOMPOSITE
         help
           The Serial Gadget talks to the Linux-USB generic serial driver.
@@ -803,6 +815,8 @@ config USB_CDC_COMPOSITE
         tristate "CDC Composite Device (Ethernet and ACM)"
         depends on NET
         select USB_LIBCOMPOSITE
+        select USB_U_SERIAL
+        select USB_F_ACM
         help
           This driver provides two functions in one configuration:
           a CDC Ethernet (ECM) link, and a CDC ACM (serial port) link.
@@ -818,6 +832,7 @@ config USB_G_NOKIA
         tristate "Nokia composite gadget"
         depends on PHONET
         select USB_LIBCOMPOSITE
+        select USB_U_SERIAL
         help
           The Nokia composite gadget provides support for acm, obex
           and phonet in only one composite gadget driver.
@@ -829,6 +844,8 @@ config USB_G_ACM_MS
         tristate "CDC Composite Device (ACM and mass storage)"
         depends on BLOCK
         select USB_LIBCOMPOSITE
+        select USB_U_SERIAL
+        select USB_F_ACM
         help
           This driver provides two functions in one configuration:
           a mass storage, and a CDC ACM (serial port) link.
@@ -841,6 +858,8 @@ config USB_G_MULTI
         depends on BLOCK && NET
         select USB_G_MULTI_CDC if !USB_G_MULTI_RNDIS
         select USB_LIBCOMPOSITE
+        select USB_U_SERIAL
+        select USB_F_ACM
         help
           The Multifunction Composite Gadget provides Ethernet (RNDIS
           and/or CDC Ethernet), mass storage and ACM serial link
@@ -916,6 +935,7 @@ config USB_G_DBGP_PRINTK
 
 config USB_G_DBGP_SERIAL
         depends on USB_G_DBGP
+        select USB_U_SERIAL
         bool "serial"
         help
           Userland can interact using /dev/ttyGSxxx.
diff --git a/drivers/usb/gadget/Makefile b/drivers/usb/gadget/Makefile
index 8b4acfd92aa3..97a13c349cc5 100644
--- a/drivers/usb/gadget/Makefile
+++ b/drivers/usb/gadget/Makefile
@@ -6,7 +6,7 @@ ccflags-$(CONFIG_USB_GADGET_DEBUG) := -DDEBUG
 obj-$(CONFIG_USB_GADGET)        += udc-core.o
 obj-$(CONFIG_USB_LIBCOMPOSITE)  += libcomposite.o
 libcomposite-y                  := usbstring.o config.o epautoconf.o
-libcomposite-y                  += composite.o
+libcomposite-y                  += composite.o functions.o
 obj-$(CONFIG_USB_DUMMY_HCD)     += dummy_hcd.o
 obj-$(CONFIG_USB_NET2272)       += net2272.o
 obj-$(CONFIG_USB_NET2280)       += net2280.o
@@ -74,3 +74,9 @@ obj-$(CONFIG_USB_G_WEBCAM)	+= g_webcam.o
 obj-$(CONFIG_USB_G_NCM)         += g_ncm.o
 obj-$(CONFIG_USB_G_ACM_MS)      += g_acm_ms.o
 obj-$(CONFIG_USB_GADGET_TARGET) += tcm_usb_gadget.o
+
+# USB Functions
+obj-$(CONFIG_USB_F_ACM)         += f_acm.o
+f_ss_lb-y                       := f_loopback.o f_sourcesink.o
+obj-$(CONFIG_USB_F_SS_LB)       += f_ss_lb.o
+obj-$(CONFIG_USB_U_SERIAL)      += u_serial.o
diff --git a/drivers/usb/gadget/acm_ms.c b/drivers/usb/gadget/acm_ms.c
index 5a7f289805ff..8f2b0e391534 100644
--- a/drivers/usb/gadget/acm_ms.c
+++ b/drivers/usb/gadget/acm_ms.c
@@ -40,9 +40,6 @@
  * the runtime footprint, and giving us at least some parts of what
  * a "gcc --combine ... part1.c part2.c part3.c ... " build would.
  */
-
-#include "u_serial.c"
-#include "f_acm.c"
 #include "f_mass_storage.c"
 
 /*-------------------------------------------------------------------------*/
@@ -112,12 +109,15 @@ FSG_MODULE_PARAMETERS(/* no prefix */, fsg_mod_data);
 static struct fsg_common fsg_common;
 
 /*-------------------------------------------------------------------------*/
-
+static unsigned char tty_line;
+static struct usb_function *f_acm;
+static struct usb_function_instance *f_acm_inst;
 /*
  * We _always_ have both ACM and mass storage functions.
  */
 static int __init acm_ms_do_config(struct usb_configuration *c)
 {
+        struct f_serial_opts *opts;
         int     status;
 
         if (gadget_is_otg(c->cdev->gadget)) {
@@ -125,16 +125,35 @@ static int __init acm_ms_do_config(struct usb_configuration *c)
                 c->bmAttributes |= USB_CONFIG_ATT_WAKEUP;
         }
 
+        f_acm_inst = usb_get_function_instance("acm");
+        if (IS_ERR(f_acm_inst))
+                return PTR_ERR(f_acm_inst);
+
+        opts = container_of(f_acm_inst, struct f_serial_opts, func_inst);
+        opts->port_num = tty_line;
+
+        f_acm = usb_get_function(f_acm_inst);
+        if (IS_ERR(f_acm)) {
+                status = PTR_ERR(f_acm);
+                goto err_func;
+        }
 
-        status = acm_bind_config(c, 0);
+        status = usb_add_function(c, f_acm);
         if (status < 0)
-                return status;
+                goto err_conf;
 
         status = fsg_bind_config(c->cdev, c, &fsg_common);
         if (status < 0)
-                return status;
+                goto err_fsg;
 
         return 0;
+err_fsg:
+        usb_remove_function(c, f_acm);
+err_conf:
+        usb_put_function(f_acm);
+err_func:
+        usb_put_function_instance(f_acm_inst);
+        return status;
 }
 
 static struct usb_configuration acm_ms_config_driver = {
@@ -153,7 +172,7 @@ static int __init acm_ms_bind(struct usb_composite_dev *cdev)
         void                    *retp;
 
         /* set up serial link layer */
-        status = gserial_setup(cdev->gadget, 1);
+        status = gserial_alloc_line(&tty_line);
         if (status < 0)
                 return status;
 
@@ -189,14 +208,15 @@ static int __init acm_ms_bind(struct usb_composite_dev *cdev)
 fail1:
         fsg_common_put(&fsg_common);
 fail0:
-        gserial_cleanup();
+        gserial_free_line(tty_line);
         return status;
 }
 
 static int __exit acm_ms_unbind(struct usb_composite_dev *cdev)
 {
-        gserial_cleanup();
-
+        usb_put_function(f_acm);
+        usb_put_function_instance(f_acm_inst);
+        gserial_free_line(tty_line);
         return 0;
 }
 
diff --git a/drivers/usb/gadget/amd5536udc.c b/drivers/usb/gadget/amd5536udc.c
index d9f6b9372491..75973f33a4c8 100644
--- a/drivers/usb/gadget/amd5536udc.c
+++ b/drivers/usb/gadget/amd5536udc.c
@@ -1400,15 +1400,16 @@ static int udc_wakeup(struct usb_gadget *gadget)
         return 0;
 }
 
-static int amd5536_start(struct usb_gadget_driver *driver,
-                int (*bind)(struct usb_gadget *, struct usb_gadget_driver *));
-static int amd5536_stop(struct usb_gadget_driver *driver);
+static int amd5536_udc_start(struct usb_gadget *g,
+                struct usb_gadget_driver *driver);
+static int amd5536_udc_stop(struct usb_gadget *g,
+                struct usb_gadget_driver *driver);
 /* gadget operations */
 static const struct usb_gadget_ops udc_ops = {
         .wakeup         = udc_wakeup,
         .get_frame      = udc_get_frame,
-        .start          = amd5536_start,
-        .stop           = amd5536_stop,
+        .udc_start      = amd5536_udc_start,
+        .udc_stop       = amd5536_udc_stop,
 };
 
 /* Setups endpoint parameters, adds endpoints to linked list */
@@ -1913,41 +1914,22 @@ static int setup_ep0(struct udc *dev)
 }
 
 /* Called by gadget driver to register itself */
-static int amd5536_start(struct usb_gadget_driver *driver,
-                int (*bind)(struct usb_gadget *, struct usb_gadget_driver *))
+static int amd5536_udc_start(struct usb_gadget *g,
+                struct usb_gadget_driver *driver)
 {
-        struct udc              *dev = udc;
-        int                     retval;
+        struct udc *dev = to_amd5536_udc(g);
         u32 tmp;
 
-        if (!driver || !bind || !driver->setup
-                        || driver->max_speed < USB_SPEED_HIGH)
-                return -EINVAL;
-        if (!dev)
-                return -ENODEV;
-        if (dev->driver)
-                return -EBUSY;
-
         driver->driver.bus = NULL;
         dev->driver = driver;
         dev->gadget.dev.driver = &driver->driver;
 
-        retval = bind(&dev->gadget, driver);
-
         /* Some gadget drivers use both ep0 directions.
          * NOTE: to gadget driver, ep0 is just one endpoint...
          */
         dev->ep[UDC_EP0OUT_IX].ep.driver_data =
                 dev->ep[UDC_EP0IN_IX].ep.driver_data;
 
-        if (retval) {
-                DBG(dev, "binding to %s returning %d\n",
-                                driver->driver.name, retval);
-                dev->driver = NULL;
-                dev->gadget.dev.driver = NULL;
-                return retval;
-        }
-
         /* get ready for ep0 traffic */
         setup_ep0(dev);
 
@@ -1969,14 +1951,9 @@ __acquires(dev->lock)
 {
         int tmp;
 
-        if (dev->gadget.speed != USB_SPEED_UNKNOWN) {
-                spin_unlock(&dev->lock);
-                driver->disconnect(&dev->gadget);
-                spin_lock(&dev->lock);
-        }
-
         /* empty queues and init hardware */
         udc_basic_init(dev);
+
         for (tmp = 0; tmp < UDC_EP_NUM; tmp++)
                 empty_req_queue(&dev->ep[tmp]);
 
@@ -1984,23 +1961,18 @@ __acquires(dev->lock)
 }
 
 /* Called by gadget driver to unregister itself */
-static int amd5536_stop(struct usb_gadget_driver *driver)
+static int amd5536_udc_stop(struct usb_gadget *g,
+                struct usb_gadget_driver *driver)
 {
-        struct udc      *dev = udc;
-        unsigned long   flags;
+        struct udc *dev = to_amd5536_udc(g);
+        unsigned long flags;
         u32 tmp;
 
-        if (!dev)
-                return -ENODEV;
-        if (!driver || driver != dev->driver || !driver->unbind)
-                return -EINVAL;
-
         spin_lock_irqsave(&dev->lock, flags);
         udc_mask_unused_interrupts(dev);
         shutdown(dev, driver);
         spin_unlock_irqrestore(&dev->lock, flags);
 
-        driver->unbind(&dev->gadget);
         dev->gadget.dev.driver = NULL;
         dev->driver = NULL;
 
@@ -2009,9 +1981,6 @@ static int amd5536_stop(struct usb_gadget_driver *driver)
         tmp |= AMD_BIT(UDC_DEVCTL_SD);
         writel(tmp, &dev->regs->ctl);
 
-
-        DBG(dev, "%s: unregistered\n", driver->driver.name);
-
         return 0;
 }
 
diff --git a/drivers/usb/gadget/amd5536udc.h b/drivers/usb/gadget/amd5536udc.h
index 14af87d65caa..f1bf32e6b8d8 100644
--- a/drivers/usb/gadget/amd5536udc.h
+++ b/drivers/usb/gadget/amd5536udc.h
@@ -563,6 +563,8 @@ struct udc {
         u16                             cur_alt;
 };
 
+#define to_amd5536_udc(g)       (container_of((g), struct udc, gadget))
+
 /* setup request data */
 union udc_setup_data {
         u32                     data[2];
diff --git a/drivers/usb/gadget/at91_udc.c b/drivers/usb/gadget/at91_udc.c
index f4a21f6f081f..10f45fa01abd 100644
--- a/drivers/usb/gadget/at91_udc.c
+++ b/drivers/usb/gadget/at91_udc.c
@@ -1621,8 +1621,7 @@ static void at91_vbus_timer(unsigned long data)
          * bus such as i2c or spi which may sleep, so schedule some work
          * to read the vbus gpio
          */
-        if (!work_pending(&udc->vbus_timer_work))
-                schedule_work(&udc->vbus_timer_work);
+        schedule_work(&udc->vbus_timer_work);
 }
 
 static int at91_start(struct usb_gadget *gadget,
@@ -1739,7 +1738,7 @@ static int at91udc_probe(struct platform_device *pdev)
 
         /* rm9200 needs manual D+ pullup; off by default */
         if (cpu_is_at91rm9200()) {
-                if (gpio_is_valid(udc->board.pullup_pin)) {
+                if (!gpio_is_valid(udc->board.pullup_pin)) {
                         DBG("no D+ pullup?\n");
                         retval = -ENODEV;
                         goto fail0;
diff --git a/drivers/usb/gadget/cdc2.c b/drivers/usb/gadget/cdc2.c
index 1e4bb77f00bb..a7d6f7026757 100644
--- a/drivers/usb/gadget/cdc2.c
+++ b/drivers/usb/gadget/cdc2.c
@@ -42,9 +42,6 @@ USB_GADGET_COMPOSITE_OPTIONS();
  * the runtime footprint, and giving us at least some parts of what
  * a "gcc --combine ... part1.c part2.c part3.c ... " build would.
  */
-
-#include "u_serial.c"
-#include "f_acm.c"
 #include "f_ecm.c"
 #include "u_ether.c"
 
@@ -108,12 +105,16 @@ static struct usb_gadget_strings *dev_strings[] = {
 static u8 hostaddr[ETH_ALEN];
 
 /*-------------------------------------------------------------------------*/
+static struct usb_function *f_acm;
+static struct usb_function_instance *fi_serial;
 
+static unsigned char tty_line;
 /*
  * We _always_ have both CDC ECM and CDC ACM functions.
  */
 static int __init cdc_do_config(struct usb_configuration *c)
 {
+        struct f_serial_opts *opts;
         int     status;
 
         if (gadget_is_otg(c->cdev->gadget)) {
@@ -125,11 +126,26 @@ static int __init cdc_do_config(struct usb_configuration *c)
         if (status < 0)
                 return status;
 
-        status = acm_bind_config(c, 0);
-        if (status < 0)
-                return status;
+        fi_serial = usb_get_function_instance("acm");
+        if (IS_ERR(fi_serial))
+                return PTR_ERR(fi_serial);
 
+        opts = container_of(fi_serial, struct f_serial_opts, func_inst);
+        opts->port_num = tty_line;
+
+        f_acm = usb_get_function(fi_serial);
+        if (IS_ERR(f_acm))
+                goto err_func_acm;
+
+        status = usb_add_function(c, f_acm);
+        if (status)
+                goto err_conf;
         return 0;
+err_conf:
+        usb_put_function(f_acm);
+err_func_acm:
+        usb_put_function_instance(fi_serial);
+        return status;
 }
 
 static struct usb_configuration cdc_config_driver = {
@@ -158,7 +174,7 @@ static int __init cdc_bind(struct usb_composite_dev *cdev)
                 return status;
 
         /* set up serial link layer */
-        status = gserial_setup(cdev->gadget, 1);
+        status = gserial_alloc_line(&tty_line);
         if (status < 0)
                 goto fail0;
 
@@ -184,7 +200,7 @@ static int __init cdc_bind(struct usb_composite_dev *cdev)
         return 0;
 
 fail1:
-        gserial_cleanup();
+        gserial_free_line(tty_line);
 fail0:
         gether_cleanup();
         return status;
@@ -192,7 +208,9 @@ fail0:
 
 static int __exit cdc_unbind(struct usb_composite_dev *cdev)
 {
-        gserial_cleanup();
+        usb_put_function(f_acm);
+        usb_put_function_instance(fi_serial);
+        gserial_free_line(tty_line);
         gether_cleanup();
         return 0;
 }
diff --git a/drivers/usb/gadget/composite.c b/drivers/usb/gadget/composite.c
index 2a6bfe759c29..7c821de8ce3d 100644
--- a/drivers/usb/gadget/composite.c
+++ b/drivers/usb/gadget/composite.c
@@ -28,6 +28,12 @@
  * with the relevant device-wide data.
  */
 
+static struct usb_gadget_strings **get_containers_gs(
+                struct usb_gadget_string_container *uc)
+{
+        return (struct usb_gadget_strings **)uc->stash;
+}
+
 /**
  * next_ep_desc() - advance to the next EP descriptor
  * @t: currect pointer within descriptor array
@@ -215,6 +221,18 @@ done:
 }
 EXPORT_SYMBOL_GPL(usb_add_function);
 
+void usb_remove_function(struct usb_configuration *c, struct usb_function *f)
+{
+        if (f->disable)
+                f->disable(f);
+
+        bitmap_zero(f->endpoints, 32);
+        list_del(&f->list);
+        if (f->unbind)
+                f->unbind(c, f);
+}
+EXPORT_SYMBOL_GPL(usb_remove_function);
+
 /**
  * usb_function_deactivate - prevent function and gadget enumeration
  * @function: the function that isn't yet ready to respond
@@ -320,6 +338,25 @@ int usb_interface_id(struct usb_configuration *config,
 }
 EXPORT_SYMBOL_GPL(usb_interface_id);
 
+static u8 encode_bMaxPower(enum usb_device_speed speed,
+                struct usb_configuration *c)
+{
+        unsigned val;
+
+        if (c->MaxPower)
+                val = c->MaxPower;
+        else
+                val = CONFIG_USB_GADGET_VBUS_DRAW;
+        if (!val)
+                return 0;
+        switch (speed) {
+        case USB_SPEED_SUPER:
+                return DIV_ROUND_UP(val, 8);
+        default:
+                return DIV_ROUND_UP(val, 2);
+        };
+}
+
 static int config_buf(struct usb_configuration *config,
                 enum usb_device_speed speed, void *buf, u8 type)
 {
@@ -339,7 +376,7 @@ static int config_buf(struct usb_configuration *config,
         c->bConfigurationValue = config->bConfigurationValue;
         c->iConfiguration = config->iConfiguration;
         c->bmAttributes = USB_CONFIG_ATT_ONE | config->bmAttributes;
-        c->bMaxPower = config->bMaxPower ? : (CONFIG_USB_GADGET_VBUS_DRAW / 2);
+        c->bMaxPower = encode_bMaxPower(speed, config);
 
         /* There may be e.g. OTG descriptors */
         if (config->descriptors) {
@@ -656,7 +693,7 @@ static int set_config(struct usb_composite_dev *cdev,
         }
 
         /* when we return, be sure our power usage is valid */
-        power = c->bMaxPower ? (2 * c->bMaxPower) : CONFIG_USB_GADGET_VBUS_DRAW;
+        power = c->MaxPower ? c->MaxPower : CONFIG_USB_GADGET_VBUS_DRAW;
 done:
         usb_gadget_vbus_draw(gadget, power);
         if (result >= 0 && cdev->delayed_status)
@@ -664,6 +701,31 @@ done:
         return result;
 }
 
+int usb_add_config_only(struct usb_composite_dev *cdev,
+                struct usb_configuration *config)
+{
+        struct usb_configuration *c;
+
+        if (!config->bConfigurationValue)
+                return -EINVAL;
+
+        /* Prevent duplicate configuration identifiers */
+        list_for_each_entry(c, &cdev->configs, list) {
+                if (c->bConfigurationValue == config->bConfigurationValue)
+                        return -EBUSY;
+        }
+
+        config->cdev = cdev;
+        list_add_tail(&config->list, &cdev->configs);
+
+        INIT_LIST_HEAD(&config->functions);
+        config->next_interface_id = 0;
+        memset(config->interface, 0, sizeof(config->interface));
+
+        return 0;
+}
+EXPORT_SYMBOL_GPL(usb_add_config_only);
+
 /**
  * usb_add_config() - add a configuration to a device.
  * @cdev: wraps the USB gadget
@@ -684,30 +746,18 @@ int usb_add_config(struct usb_composite_dev *cdev,
                 int (*bind)(struct usb_configuration *))
 {
         int                             status = -EINVAL;
-        struct usb_configuration        *c;
+
+        if (!bind)
+                goto done;
 
         DBG(cdev, "adding config #%u '%s'/%p\n",
                         config->bConfigurationValue,
                         config->label, config);
 
-        if (!config->bConfigurationValue || !bind)
+        status = usb_add_config_only(cdev, config);
+        if (status)
                 goto done;
 
-        /* Prevent duplicate configuration identifiers */
-        list_for_each_entry(c, &cdev->configs, list) {
-                if (c->bConfigurationValue == config->bConfigurationValue) {
-                        status = -EBUSY;
-                        goto done;
-                }
-        }
-
-        config->cdev = cdev;
-        list_add_tail(&config->list, &cdev->configs);
-
-        INIT_LIST_HEAD(&config->functions);
-        config->next_interface_id = 0;
-        memset(config->interface, 0, sizeof(config->interface));
-
         status = bind(config);
         if (status < 0) {
                 while (!list_empty(&config->functions)) {
@@ -860,6 +910,7 @@ static int get_string(struct usb_composite_dev *cdev,
                 void *buf, u16 language, int id)
 {
         struct usb_composite_driver     *composite = cdev->driver;
+        struct usb_gadget_string_container *uc;
         struct usb_configuration        *c;
         struct usb_function             *f;
         int                             len;
@@ -892,6 +943,12 @@ static int get_string(struct usb_composite_dev *cdev,
                                         collect_langs(sp, s->wData);
                         }
                 }
+                list_for_each_entry(uc, &cdev->gstrings, list) {
+                        struct usb_gadget_strings **sp;
+
+                        sp = get_containers_gs(uc);
+                        collect_langs(sp, s->wData);
+                }
 
                 for (len = 0; len <= 126 && s->wData[len]; len++)
                         continue;
@@ -902,6 +959,15 @@ static int get_string(struct usb_composite_dev *cdev,
                 return s->bLength;
         }
 
+        list_for_each_entry(uc, &cdev->gstrings, list) {
+                struct usb_gadget_strings **sp;
+
+                sp = get_containers_gs(uc);
+                len = lookup_string(sp, buf, language, id);
+                if (len > 0)
+                        return len;
+        }
+
         /* String IDs are device-scoped, so we look up each string
          * table we're told about.  These lookups are infrequent;
          * simpler-is-better here.
@@ -987,6 +1053,119 @@ int usb_string_ids_tab(struct usb_composite_dev *cdev, struct usb_string *str)
 }
 EXPORT_SYMBOL_GPL(usb_string_ids_tab);
 
+static struct usb_gadget_string_container *copy_gadget_strings(
+                struct usb_gadget_strings **sp, unsigned n_gstrings,
+                unsigned n_strings)
+{
+        struct usb_gadget_string_container *uc;
+        struct usb_gadget_strings **gs_array;
+        struct usb_gadget_strings *gs;
+        struct usb_string *s;
+        unsigned mem;
+        unsigned n_gs;
+        unsigned n_s;
+        void *stash;
+
+        mem = sizeof(*uc);
+        mem += sizeof(void *) * (n_gstrings + 1);
+        mem += sizeof(struct usb_gadget_strings) * n_gstrings;
+        mem += sizeof(struct usb_string) * (n_strings + 1) * (n_gstrings);
+        uc = kmalloc(mem, GFP_KERNEL);
+        if (!uc)
+                return ERR_PTR(-ENOMEM);
+        gs_array = get_containers_gs(uc);
+        stash = uc->stash;
+        stash += sizeof(void *) * (n_gstrings + 1);
+        for (n_gs = 0; n_gs < n_gstrings; n_gs++) {
+                struct usb_string *org_s;
+
+                gs_array[n_gs] = stash;
+                gs = gs_array[n_gs];
+                stash += sizeof(struct usb_gadget_strings);
+                gs->language = sp[n_gs]->language;
+                gs->strings = stash;
+                org_s = sp[n_gs]->strings;
+
+                for (n_s = 0; n_s < n_strings; n_s++) {
+                        s = stash;
+                        stash += sizeof(struct usb_string);
+                        if (org_s->s)
+                                s->s = org_s->s;
+                        else
+                                s->s = "";
+                        org_s++;
+                }
+                s = stash;
+                s->s = NULL;
+                stash += sizeof(struct usb_string);
+
+        }
+        gs_array[n_gs] = NULL;
+        return uc;
+}
+
+/**
+ * usb_gstrings_attach() - attach gadget strings to a cdev and assign ids
+ * @cdev: the device whose string descriptor IDs are being allocated
+ * and attached.
+ * @sp: an array of usb_gadget_strings to attach.
+ * @n_strings: number of entries in each usb_strings array (sp[]->strings)
+ *
+ * This function will create a deep copy of usb_gadget_strings and usb_string
+ * and attach it to the cdev. The actual string (usb_string.s) will not be
+ * copied but only a referenced will be made. The struct usb_gadget_strings
+ * array may contain multiple languges and should be NULL terminated.
+ * The ->language pointer of each struct usb_gadget_strings has to contain the
+ * same amount of entries.
+ * For instance: sp[0] is en-US, sp[1] is es-ES. It is expected that the first
+ * usb_string entry of es-ES containts the translation of the first usb_string
+ * entry of en-US. Therefore both entries become the same id assign.
+ */
+struct usb_string *usb_gstrings_attach(struct usb_composite_dev *cdev,
+                struct usb_gadget_strings **sp, unsigned n_strings)
+{
+        struct usb_gadget_string_container *uc;
+        struct usb_gadget_strings **n_gs;
+        unsigned n_gstrings = 0;
+        unsigned i;
+        int ret;
+
+        for (i = 0; sp[i]; i++)
+                n_gstrings++;
+
+        if (!n_gstrings)
+                return ERR_PTR(-EINVAL);
+
+        uc = copy_gadget_strings(sp, n_gstrings, n_strings);
+        if (IS_ERR(uc))
+                return ERR_PTR(PTR_ERR(uc));
+
+        n_gs = get_containers_gs(uc);
+        ret = usb_string_ids_tab(cdev, n_gs[0]->strings);
+        if (ret)
+                goto err;
+
+        for (i = 1; i < n_gstrings; i++) {
+                struct usb_string *m_s;
+                struct usb_string *s;
+                unsigned n;
+
+                m_s = n_gs[0]->strings;
+                s = n_gs[i]->strings;
+                for (n = 0; n < n_strings; n++) {
+                        s->id = m_s->id;
+                        s++;
+                        m_s++;
+                }
+        }
+        list_add_tail(&uc->list, &cdev->gstrings);
+        return n_gs[0]->strings;
+err:
+        kfree(uc);
+        return ERR_PTR(ret);
+}
+EXPORT_SYMBOL_GPL(usb_gstrings_attach);
+
 /**
  * usb_string_ids_n() - allocate unused string IDs in batch
  * @c: the device whose string descriptor IDs are being allocated
@@ -1033,7 +1212,7 @@ static void composite_setup_complete(struct usb_ep *ep, struct usb_request *req)
  * housekeeping for the gadget function we're implementing.  Most of
  * the work is in config and function specific setup.
  */
-static int
+int
 composite_setup(struct usb_gadget *gadget, const struct usb_ctrlrequest *ctrl)
 {
         struct usb_composite_dev        *cdev = get_gadget_data(gadget);
@@ -1300,7 +1479,7 @@ done:
         return value;
 }
 
-static void composite_disconnect(struct usb_gadget *gadget)
+void composite_disconnect(struct usb_gadget *gadget)
 {
         struct usb_composite_dev        *cdev = get_gadget_data(gadget);
         unsigned long                   flags;
@@ -1330,8 +1509,7 @@ static ssize_t composite_show_suspended(struct device *dev,
 
 static DEVICE_ATTR(suspended, 0444, composite_show_suspended, NULL);
 
-static void
-composite_unbind(struct usb_gadget *gadget)
+static void __composite_unbind(struct usb_gadget *gadget, bool unbind_driver)
 {
         struct usb_composite_dev        *cdev = get_gadget_data(gadget);
 
@@ -1348,19 +1526,21 @@ composite_unbind(struct usb_gadget *gadget)
                                 struct usb_configuration, list);
                 remove_config(cdev, c);
         }
-        if (cdev->driver->unbind)
+        if (cdev->driver->unbind && unbind_driver)
                 cdev->driver->unbind(cdev);
 
-        if (cdev->req) {
-                kfree(cdev->req->buf);
-                usb_ep_free_request(gadget->ep0, cdev->req);
-        }
-        device_remove_file(&gadget->dev, &dev_attr_suspended);
+        composite_dev_cleanup(cdev);
+
         kfree(cdev->def_manufacturer);
         kfree(cdev);
         set_gadget_data(gadget, NULL);
 }
 
+static void composite_unbind(struct usb_gadget *gadget)
+{
+        __composite_unbind(gadget, true);
+}
+
 static void update_unchanged_dev_desc(struct usb_device_descriptor *new,
                 const struct usb_device_descriptor *old)
 {
@@ -1399,34 +1579,25 @@ static void update_unchanged_dev_desc(struct usb_device_descriptor *new,
                 new->iProduct = iProduct;
 }
 
-static struct usb_composite_driver *to_cdriver(struct usb_gadget_driver *gdrv)
-{
-        return container_of(gdrv, struct usb_composite_driver, gadget_driver);
-}
-
-static int composite_bind(struct usb_gadget *gadget,
-                struct usb_gadget_driver *gdriver)
+int composite_dev_prepare(struct usb_composite_driver *composite,
+                struct usb_composite_dev *cdev)
 {
-        struct usb_composite_dev        *cdev;
-        struct usb_composite_driver     *composite = to_cdriver(gdriver);
-        int                             status = -ENOMEM;
-
-        cdev = kzalloc(sizeof *cdev, GFP_KERNEL);
-        if (!cdev)
-                return status;
-
-        spin_lock_init(&cdev->lock);
-        cdev->gadget = gadget;
-        set_gadget_data(gadget, cdev);
-        INIT_LIST_HEAD(&cdev->configs);
+        struct usb_gadget *gadget = cdev->gadget;
+        int ret = -ENOMEM;
 
         /* preallocate control response and buffer */
         cdev->req = usb_ep_alloc_request(gadget->ep0, GFP_KERNEL);
         if (!cdev->req)
-                goto fail;
+                return -ENOMEM;
+
         cdev->req->buf = kmalloc(USB_COMP_EP0_BUFSIZ, GFP_KERNEL);
         if (!cdev->req->buf)
                 goto fail;
+
+        ret = device_create_file(&gadget->dev, &dev_attr_suspended);
+        if (ret)
+                goto fail_dev;
+
         cdev->req->complete = composite_setup_complete;
         gadget->ep0->driver_data = cdev;
 
@@ -1444,7 +1615,51 @@ static int composite_bind(struct usb_gadget *gadget,
          * we force endpoints to start unassigned; few controller
          * drivers will zero ep->driver_data.
          */
-        usb_ep_autoconfig_reset(cdev->gadget);
+        usb_ep_autoconfig_reset(gadget);
+        return 0;
+fail_dev:
+        kfree(cdev->req->buf);
+fail:
+        usb_ep_free_request(gadget->ep0, cdev->req);
+        cdev->req = NULL;
+        return ret;
+}
+
+void composite_dev_cleanup(struct usb_composite_dev *cdev)
+{
+        struct usb_gadget_string_container *uc, *tmp;
+
+        list_for_each_entry_safe(uc, tmp, &cdev->gstrings, list) {
+                list_del(&uc->list);
+                kfree(uc);
+        }
+        if (cdev->req) {
+                kfree(cdev->req->buf);
+                usb_ep_free_request(cdev->gadget->ep0, cdev->req);
+        }
+        device_remove_file(&cdev->gadget->dev, &dev_attr_suspended);
+}
+
+static int composite_bind(struct usb_gadget *gadget,
+                struct usb_gadget_driver *gdriver)
+{
+        struct usb_composite_dev        *cdev;
+        struct usb_composite_driver     *composite = to_cdriver(gdriver);
+        int                             status = -ENOMEM;
+
+        cdev = kzalloc(sizeof *cdev, GFP_KERNEL);
+        if (!cdev)
+                return status;
+
+        spin_lock_init(&cdev->lock);
+        cdev->gadget = gadget;
+        set_gadget_data(gadget, cdev);
+        INIT_LIST_HEAD(&cdev->configs);
+        INIT_LIST_HEAD(&cdev->gstrings);
+
+        status = composite_dev_prepare(composite, cdev);
+        if (status)
+                goto fail;
 
         /* composite gadget needs to assign strings for whole device (like
          * serial number), register function drivers, potentially update
@@ -1460,16 +1675,11 @@ static int composite_bind(struct usb_gadget *gadget,
         if (composite->needs_serial && !cdev->desc.iSerialNumber)
                 WARNING(cdev, "userspace failed to provide iSerialNumber\n");
 
-        /* finish up */
-        status = device_create_file(&gadget->dev, &dev_attr_suspended);
-        if (status)
-                goto fail;
-
         INFO(cdev, "%s ready\n", composite->name);
         return 0;
 
 fail:
-        composite_unbind(gadget);
+        __composite_unbind(gadget, false);
         return status;
 }
 
@@ -1518,10 +1728,10 @@ composite_resume(struct usb_gadget *gadget)
                                 f->resume(f);
                 }
 
-                maxpower = cdev->config->bMaxPower;
+                maxpower = cdev->config->MaxPower;
 
                 usb_gadget_vbus_draw(gadget, maxpower ?
-                        (2 * maxpower) : CONFIG_USB_GADGET_VBUS_DRAW);
+                        maxpower : CONFIG_USB_GADGET_VBUS_DRAW);
         }
 
         cdev->suspended = 0;
diff --git a/drivers/usb/gadget/dbgp.c b/drivers/usb/gadget/dbgp.c
index 87d165028162..986fc511a2ed 100644
--- a/drivers/usb/gadget/dbgp.c
+++ b/drivers/usb/gadget/dbgp.c
@@ -13,9 +13,7 @@
 #include <linux/usb/ch9.h>
 #include <linux/usb/gadget.h>
 
-#ifdef CONFIG_USB_G_DBGP_SERIAL
-#include "u_serial.c"
-#endif
+#include "u_serial.h"
 
 #define DRIVER_VENDOR_ID        0x0525 /* NetChip */
 #define DRIVER_PRODUCT_ID       0xc0de /* undefined */
@@ -233,6 +231,10 @@ static void dbgp_unbind(struct usb_gadget *gadget)
         gadget->ep0->driver_data = NULL;
 }
 
+#ifdef CONFIG_USB_G_DBGP_SERIAL
+static unsigned char tty_line;
+#endif
+
 static int __init dbgp_configure_endpoints(struct usb_gadget *gadget)
 {
         int stp;
@@ -270,7 +272,7 @@ static int __init dbgp_configure_endpoints(struct usb_gadget *gadget)
         dbgp.serial->in->desc = &i_desc;
         dbgp.serial->out->desc = &o_desc;
 
-        if (gserial_setup(gadget, 1) < 0) {
+        if (gserial_alloc_line(&tty_line)) {
                 stp = 3;
                 goto fail_3;
         }
@@ -379,7 +381,7 @@ static int dbgp_setup(struct usb_gadget *gadget,
 #ifdef CONFIG_USB_G_DBGP_PRINTK
                 err = dbgp_enable_ep();
 #else
-                err = gserial_connect(dbgp.serial, 0);
+                err = gserial_connect(dbgp.serial, tty_line);
 #endif
                 if (err < 0)
                         goto fail;
@@ -422,7 +424,7 @@ static void __exit dbgp_exit(void)
 {
         usb_gadget_unregister_driver(&dbgp_driver);
 #ifdef CONFIG_USB_G_DBGP_SERIAL
-        gserial_cleanup();
+        gserial_free_line(tty_line);
 #endif
 }
 
diff --git a/drivers/usb/gadget/f_acm.c b/drivers/usb/gadget/f_acm.c
index 549174466c21..1ae180baa597 100644
--- a/drivers/usb/gadget/f_acm.c
+++ b/drivers/usb/gadget/f_acm.c
@@ -16,7 +16,9 @@
 
 #include <linux/slab.h>
 #include <linux/kernel.h>
+#include <linux/module.h>
 #include <linux/device.h>
+#include <linux/err.h>
 
 #include "u_serial.h"
 #include "gadget_chips.h"
@@ -283,7 +285,6 @@ static struct usb_string acm_string_defs[] = {
         [ACM_CTRL_IDX].s = "CDC Abstract Control Model (ACM)",
         [ACM_DATA_IDX].s = "CDC ACM Data",
         [ACM_IAD_IDX ].s = "CDC Serial",
-        {  /* ZEROES END LIST */ },
 };
 
 static struct usb_gadget_strings acm_string_table = {
@@ -605,9 +606,23 @@ acm_bind(struct usb_configuration *c, struct usb_function *f)
 {
         struct usb_composite_dev *cdev = c->cdev;
         struct f_acm            *acm = func_to_acm(f);
+        struct usb_string       *us;
         int                     status;
         struct usb_ep           *ep;
 
+        /* REVISIT might want instance-specific strings to help
+         * distinguish instances ...
+         */
+
+        /* maybe allocate device-global string IDs, and patch descriptors */
+        us = usb_gstrings_attach(cdev, acm_strings,
+                        ARRAY_SIZE(acm_string_defs));
+        if (IS_ERR(us))
+                return PTR_ERR(us);
+        acm_control_interface_desc.iInterface = us[ACM_CTRL_IDX].id;
+        acm_data_interface_desc.iInterface = us[ACM_DATA_IDX].id;
+        acm_iad_descriptor.iFunction = us[ACM_IAD_IDX].id;
+
         /* allocate instance-specific interface IDs, and patch descriptors */
         status = usb_interface_id(c, f);
         if (status < 0)
@@ -700,24 +715,42 @@ fail:
         return status;
 }
 
+static struct f_acm *acm_alloc_basic_func(void)
+{
+        struct f_acm    *acm;
+
+        acm = kzalloc(sizeof(*acm), GFP_KERNEL);
+        if (!acm)
+                return NULL;
+
+        spin_lock_init(&acm->lock);
+
+        acm->port.connect = acm_connect;
+        acm->port.disconnect = acm_disconnect;
+        acm->port.send_break = acm_send_break;
+
+        acm->port.func.name = "acm";
+        /* descriptors are per-instance copies */
+        acm->port.func.bind = acm_bind;
+        acm->port.func.set_alt = acm_set_alt;
+        acm->port.func.setup = acm_setup;
+        acm->port.func.disable = acm_disable;
+
+        return acm;
+}
+
+#ifdef USB_FACM_INCLUDED
 static void
-acm_unbind(struct usb_configuration *c, struct usb_function *f)
+acm_old_unbind(struct usb_configuration *c, struct usb_function *f)
 {
         struct f_acm            *acm = func_to_acm(f);
 
-        acm_string_defs[0].id = 0;
         usb_free_all_descriptors(f);
-        gs_free_req(acm->notify, acm->notify_req);
+        if (acm->notify_req)
+                gs_free_req(acm->notify, acm->notify_req);
         kfree(acm);
 }
 
-/* Some controllers can't support CDC ACM ... */
-static inline bool can_support_cdc(struct usb_configuration *c)
-{
-        /* everything else is *probably* fine ... */
-        return true;
-}
-
 /**
  * acm_bind_config - add a CDC ACM function to a configuration
  * @c: the configuration to support the CDC ACM instance
@@ -726,58 +759,80 @@ static inline bool can_support_cdc(struct usb_configuration *c)
  *
  * Returns zero on success, else negative errno.
  *
- * Caller must have called @gserial_setup() with enough ports to
- * handle all the ones it binds.  Caller is also responsible
- * for calling @gserial_cleanup() before module unload.
  */
 int acm_bind_config(struct usb_configuration *c, u8 port_num)
 {
         struct f_acm    *acm;
         int             status;
 
-        if (!can_support_cdc(c))
-                return -EINVAL;
-
-        /* REVISIT might want instance-specific strings to help
-         * distinguish instances ...
-         */
-
-        /* maybe allocate device-global string IDs, and patch descriptors */
-        if (acm_string_defs[0].id == 0) {
-                status = usb_string_ids_tab(c->cdev, acm_string_defs);
-                if (status < 0)
-                        return status;
-                acm_control_interface_desc.iInterface =
-                        acm_string_defs[ACM_CTRL_IDX].id;
-                acm_data_interface_desc.iInterface =
-                        acm_string_defs[ACM_DATA_IDX].id;
-                acm_iad_descriptor.iFunction = acm_string_defs[ACM_IAD_IDX].id;
-        }
-
         /* allocate and initialize one new instance */
-        acm = kzalloc(sizeof *acm, GFP_KERNEL);
+        acm = acm_alloc_basic_func();
         if (!acm)
                 return -ENOMEM;
 
-        spin_lock_init(&acm->lock);
-
         acm->port_num = port_num;
-
-        acm->port.connect = acm_connect;
-        acm->port.disconnect = acm_disconnect;
-        acm->port.send_break = acm_send_break;
-
-        acm->port.func.name = "acm";
-        acm->port.func.strings = acm_strings;
-        /* descriptors are per-instance copies */
-        acm->port.func.bind = acm_bind;
-        acm->port.func.unbind = acm_unbind;
-        acm->port.func.set_alt = acm_set_alt;
-        acm->port.func.setup = acm_setup;
-        acm->port.func.disable = acm_disable;
+        acm->port.func.unbind = acm_old_unbind;
 
         status = usb_add_function(c, &acm->port.func);
         if (status)
                 kfree(acm);
         return status;
 }
+
+#else
+
+static void acm_unbind(struct usb_configuration *c, struct usb_function *f)
+{
+        struct f_acm            *acm = func_to_acm(f);
+
+        acm_string_defs[0].id = 0;
+        usb_free_all_descriptors(f);
+        if (acm->notify_req)
+                gs_free_req(acm->notify, acm->notify_req);
+}
+
+static void acm_free_func(struct usb_function *f)
+{
+        struct f_acm            *acm = func_to_acm(f);
+
+        kfree(acm);
+}
+
+static struct usb_function *acm_alloc_func(struct usb_function_instance *fi)
+{
+        struct f_serial_opts *opts;
+        struct f_acm *acm;
+
+        acm = acm_alloc_basic_func();
+        if (!acm)
+                return ERR_PTR(-ENOMEM);
+
+        opts = container_of(fi, struct f_serial_opts, func_inst);
+        acm->port_num = opts->port_num;
+        acm->port.func.unbind = acm_unbind;
+        acm->port.func.free_func = acm_free_func;
+
+        return &acm->port.func;
+}
+
+static void acm_free_instance(struct usb_function_instance *fi)
+{
+        struct f_serial_opts *opts;
+
+        opts = container_of(fi, struct f_serial_opts, func_inst);
+        kfree(opts);
+}
+
+static struct usb_function_instance *acm_alloc_instance(void)
+{
+        struct f_serial_opts *opts;
+
+        opts = kzalloc(sizeof(*opts), GFP_KERNEL);
+        if (!opts)
+                return ERR_PTR(-ENOMEM);
+        opts->func_inst.free_func_inst = acm_free_instance;
+        return &opts->func_inst;
+}
+DECLARE_USB_FUNCTION_INIT(acm, acm_alloc_instance, acm_alloc_func);
+MODULE_LICENSE("GPL");
+#endif
diff --git a/drivers/usb/gadget/f_fs.c b/drivers/usb/gadget/f_fs.c
index 4a6961c517f2..449186c9fd6c 100644
--- a/drivers/usb/gadget/f_fs.c
+++ b/drivers/usb/gadget/f_fs.c
@@ -1103,8 +1103,8 @@ static int ffs_fs_parse_opts(struct ffs_sb_fill_data *data, char *opts)
                 return 0;
 
         for (;;) {
-                char *end, *eq, *comma;
                 unsigned long value;
+                char *eq, *comma;
 
                 /* Option limit */
                 comma = strchr(opts, ',');
@@ -1120,8 +1120,7 @@ static int ffs_fs_parse_opts(struct ffs_sb_fill_data *data, char *opts)
                 *eq = 0;
 
                 /* Parse value */
-                value = simple_strtoul(eq + 1, &end, 0);
-                if (unlikely(*end != ',' && *end != 0)) {
+                if (kstrtoul(eq + 1, 0, &value)) {
                         pr_err("%s: invalid value: %s\n", opts, eq + 1);
                         return -EINVAL;
                 }
diff --git a/drivers/usb/gadget/f_loopback.c b/drivers/usb/gadget/f_loopback.c
index bb39cb2bb3a3..4a3873a0f2d0 100644
--- a/drivers/usb/gadget/f_loopback.c
+++ b/drivers/usb/gadget/f_loopback.c
@@ -15,10 +15,11 @@
 #include <linux/slab.h>
 #include <linux/kernel.h>
 #include <linux/device.h>
+#include <linux/module.h>
+#include <linux/err.h>
+#include <linux/usb/composite.h>
 
 #include "g_zero.h"
-#include "gadget_chips.h"
-
 
 /*
  * LOOPBACK FUNCTION ... a testing vehicle for USB peripherals,
@@ -44,9 +45,8 @@ static inline struct f_loopback *func_to_loop(struct usb_function *f)
         return container_of(f, struct f_loopback, function);
 }
 
-static unsigned qlen = 32;
-module_param(qlen, uint, 0);
-MODULE_PARM_DESC(qlenn, "depth of loopback queue");
+static unsigned qlen;
+static unsigned buflen;
 
 /*-------------------------------------------------------------------------*/
 
@@ -171,8 +171,7 @@ static struct usb_gadget_strings *loopback_strings[] = {
 
 /*-------------------------------------------------------------------------*/
 
-static int __init
-loopback_bind(struct usb_configuration *c, struct usb_function *f)
+static int loopback_bind(struct usb_configuration *c, struct usb_function *f)
 {
         struct usb_composite_dev *cdev = c->cdev;
         struct f_loopback       *loop = func_to_loop(f);
@@ -185,6 +184,12 @@ loopback_bind(struct usb_configuration *c, struct usb_function *f)
                 return id;
         loopback_intf.bInterfaceNumber = id;
 
+        id = usb_string_id(cdev);
+        if (id < 0)
+                return id;
+        strings_loopback[0].id = id;
+        loopback_intf.iInterface = id;
+
         /* allocate endpoints */
 
         loop->in_ep = usb_ep_autoconfig(cdev->gadget, &fs_loop_source_desc);
@@ -223,8 +228,7 @@ autoconf_fail:
         return 0;
 }
 
-static void
-loopback_unbind(struct usb_configuration *c, struct usb_function *f)
+static void lb_free_func(struct usb_function *f)
 {
         usb_free_all_descriptors(f);
         kfree(func_to_loop(f));
@@ -366,63 +370,64 @@ static void loopback_disable(struct usb_function *f)
         disable_loopback(loop);
 }
 
-/*-------------------------------------------------------------------------*/
-
-static int __init loopback_bind_config(struct usb_configuration *c)
+static struct usb_function *loopback_alloc(struct usb_function_instance *fi)
 {
         struct f_loopback       *loop;
-        int                     status;
+        struct f_lb_opts        *lb_opts;
 
         loop = kzalloc(sizeof *loop, GFP_KERNEL);
         if (!loop)
-                return -ENOMEM;
+                return ERR_PTR(-ENOMEM);
+
+        lb_opts = container_of(fi, struct f_lb_opts, func_inst);
+        buflen = lb_opts->bulk_buflen;
+        qlen = lb_opts->qlen;
+        if (!qlen)
+                qlen = 32;
 
         loop->function.name = "loopback";
         loop->function.bind = loopback_bind;
-        loop->function.unbind = loopback_unbind;
         loop->function.set_alt = loopback_set_alt;
         loop->function.disable = loopback_disable;
+        loop->function.strings = loopback_strings;
 
-        status = usb_add_function(c, &loop->function);
-        if (status)
-                kfree(loop);
-        return status;
-}
+        loop->function.free_func = lb_free_func;
 
-static struct usb_configuration loopback_driver = {
-        .label          = "loopback",
-        .strings        = loopback_strings,
-        .bConfigurationValue = 2,
-        .bmAttributes   = USB_CONFIG_ATT_SELFPOWER,
-        /* .iConfiguration = DYNAMIC */
-};
+        return &loop->function;
+}
 
-/**
- * loopback_add - add a loopback testing configuration to a device
- * @cdev: the device to support the loopback configuration
- */
-int __init loopback_add(struct usb_composite_dev *cdev, bool autoresume)
+static void lb_free_instance(struct usb_function_instance *fi)
 {
-        int id;
+        struct f_lb_opts *lb_opts;
 
-        /* allocate string ID(s) */
-        id = usb_string_id(cdev);
-        if (id < 0)
-                return id;
-        strings_loopback[0].id = id;
+        lb_opts = container_of(fi, struct f_lb_opts, func_inst);
+        kfree(lb_opts);
+}
 
-        loopback_intf.iInterface = id;
-        loopback_driver.iConfiguration = id;
+static struct usb_function_instance *loopback_alloc_instance(void)
+{
+        struct f_lb_opts *lb_opts;
 
-        /* support autoresume for remote wakeup testing */
-        if (autoresume)
-                loopback_driver.bmAttributes |= USB_CONFIG_ATT_WAKEUP;
+        lb_opts = kzalloc(sizeof(*lb_opts), GFP_KERNEL);
+        if (!lb_opts)
+                return ERR_PTR(-ENOMEM);
+        lb_opts->func_inst.free_func_inst = lb_free_instance;
+        return  &lb_opts->func_inst;
+}
+DECLARE_USB_FUNCTION(Loopback, loopback_alloc_instance, loopback_alloc);
 
-        /* support OTG systems */
-        if (gadget_is_otg(cdev->gadget)) {
-                loopback_driver.descriptors = otg_desc;
-                loopback_driver.bmAttributes |= USB_CONFIG_ATT_WAKEUP;
-        }
+int __init lb_modinit(void)
+{
+        int ret;
 
-        return usb_add_config(cdev, &loopback_driver, loopback_bind_config);
+        ret = usb_function_register(&Loopbackusb_func);
+        if (ret)
+                return ret;
+        return ret;
 }
+void __exit lb_modexit(void)
+{
+        usb_function_unregister(&Loopbackusb_func);
+}
+
+MODULE_LICENSE("GPL");
diff --git a/drivers/usb/gadget/f_mass_storage.c b/drivers/usb/gadget/f_mass_storage.c
index 5d027b3e1ef0..fc5c16ca5e0a 100644
--- a/drivers/usb/gadget/f_mass_storage.c
+++ b/drivers/usb/gadget/f_mass_storage.c
@@ -246,20 +246,6 @@ struct fsg_operations {
          * set).
          */
         int (*thread_exits)(struct fsg_common *common);
-
-        /*
-         * Called prior to ejection.  Negative return means error,
-         * zero means to continue with ejection, positive means not to
-         * eject.
-         */
-        int (*pre_eject)(struct fsg_common *common,
-                         struct fsg_lun *lun, int num);
-        /*
-         * Called after ejection.  Negative return means error, zero
-         * or positive is just a success.
-         */
-        int (*post_eject)(struct fsg_common *common,
-                          struct fsg_lun *lun, int num);
 };
 
 /* Data shared by all the FSG instances. */
@@ -1374,26 +1360,13 @@ static int do_start_stop(struct fsg_common *common)
         if (!loej)
                 return 0;
 
-        /* Simulate an unload/eject */
-        if (common->ops && common->ops->pre_eject) {
-                int r = common->ops->pre_eject(common, curlun,
-                                               curlun - common->luns);
-                if (unlikely(r < 0))
-                        return r;
-                else if (r)
-                        return 0;
-        }
-
         up_read(&common->filesem);
         down_write(&common->filesem);
         fsg_lun_close(curlun);
         up_write(&common->filesem);
         down_read(&common->filesem);
 
-        return common->ops && common->ops->post_eject
-                ? min(0, common->ops->post_eject(common, curlun,
-                                                 curlun - common->luns))
-                : 0;
+        return 0;
 }
 
 static int do_prevent_allow(struct fsg_common *common)
@@ -1718,7 +1691,7 @@ static int check_command(struct fsg_common *common, int cmnd_size,
                          int needs_medium, const char *name)
 {
         int                     i;
-        int                     lun = common->cmnd[1] >> 5;
+        unsigned int            lun = common->cmnd[1] >> 5;
         static const char       dirletter[4] = {'u', 'o', 'i', 'n'};
         char                    hdlen[20];
         struct fsg_lun          *curlun;
@@ -1784,7 +1757,7 @@ static int check_command(struct fsg_common *common, int cmnd_size,
 
         /* Check that the LUN values are consistent */
         if (common->lun != lun)
-                DBG(common, "using LUN %d from CBW, not LUN %d from CDB\n",
+                DBG(common, "using LUN %u from CBW, not LUN %u from CDB\n",
                     common->lun, lun);
 
         /* Check the LUN */
@@ -1804,7 +1777,7 @@ static int check_command(struct fsg_common *common, int cmnd_size,
                  */
                 if (common->cmnd[0] != INQUIRY &&
                     common->cmnd[0] != REQUEST_SENSE) {
-                        DBG(common, "unsupported LUN %d\n", common->lun);
+                        DBG(common, "unsupported LUN %u\n", common->lun);
                         return -EINVAL;
                 }
         }
@@ -2196,7 +2169,7 @@ static int received_cbw(struct fsg_dev *fsg, struct fsg_buffhd *bh)
         if (common->data_size == 0)
                 common->data_dir = DATA_DIR_NONE;
         common->lun = cbw->Lun;
-        if (common->lun >= 0 && common->lun < common->nluns)
+        if (common->lun < common->nluns)
                 common->curlun = &common->luns[common->lun];
         else
                 common->curlun = NULL;
diff --git a/drivers/usb/gadget/f_ncm.c b/drivers/usb/gadget/f_ncm.c
index 6c8362f937be..5e7557e23ecc 100644
--- a/drivers/usb/gadget/f_ncm.c
+++ b/drivers/usb/gadget/f_ncm.c
@@ -56,8 +56,9 @@ struct f_ncm {
         u8                              notify_state;
         bool                            is_open;
 
-        struct ndp_parser_opts          *parser_opts;
+        const struct ndp_parser_opts    *parser_opts;
         bool                            is_crc;
+        u32                             ndp_sign;
 
         /*
          * for notification, it is accessed from both
@@ -390,8 +391,8 @@ struct ndp_parser_opts {
                 .next_fp_index = 2,                             \
         }
 
-static struct ndp_parser_opts ndp16_opts = INIT_NDP16_OPTS;
-static struct ndp_parser_opts ndp32_opts = INIT_NDP32_OPTS;
+static const struct ndp_parser_opts ndp16_opts = INIT_NDP16_OPTS;
+static const struct ndp_parser_opts ndp32_opts = INIT_NDP32_OPTS;
 
 static inline void put_ncm(__le16 **p, unsigned size, unsigned val)
 {
@@ -732,8 +733,7 @@ static int ncm_setup(struct usb_function *f, const struct usb_ctrlrequest *ctrl)
                 default:
                         goto invalid;
                 }
-                ncm->parser_opts->ndp_sign &= ~NCM_NDP_HDR_CRC_MASK;
-                ncm->parser_opts->ndp_sign |= ndp_hdr_crc;
+                ncm->ndp_sign = ncm->parser_opts->ndp_sign | ndp_hdr_crc;
                 value = 0;
                 break;
         }
@@ -875,7 +875,7 @@ static struct sk_buff *ncm_wrap_ntb(struct gether *port,
         int             ndp_align;
         int             ndp_pad;
         unsigned        max_size = ncm->port.fixed_in_len;
-        struct ndp_parser_opts *opts = ncm->parser_opts;
+        const struct ndp_parser_opts *opts = ncm->parser_opts;
         unsigned        crc_len = ncm->is_crc ? sizeof(uint32_t) : 0;
 
         div = le16_to_cpu(ntb_parameters.wNdpInDivisor);
@@ -921,7 +921,7 @@ static struct sk_buff *ncm_wrap_ntb(struct gether *port,
         tmp = (void *)tmp + ndp_pad;
 
         /* NDP */
-        put_unaligned_le32(opts->ndp_sign, tmp); /* dwSignature */
+        put_unaligned_le32(ncm->ndp_sign, tmp); /* dwSignature */
         tmp += 2;
         /* wLength */
         put_unaligned_le16(ncb_len - opts->nth_size - pad, tmp++);
@@ -965,7 +965,7 @@ static int ncm_unwrap_ntb(struct gether *port,
         struct sk_buff  *skb2;
         int             ret = -EINVAL;
         unsigned        max_size = le32_to_cpu(ntb_parameters.dwNtbOutMaxSize);
-        struct ndp_parser_opts *opts = ncm->parser_opts;
+        const struct ndp_parser_opts *opts = ncm->parser_opts;
         unsigned        crc_len = ncm->is_crc ? sizeof(uint32_t) : 0;
         int             dgram_counter;
 
@@ -1002,7 +1002,7 @@ static int ncm_unwrap_ntb(struct gether *port,
 
         /* walk through NDP */
         tmp = ((void *)skb->data) + index;
-        if (get_unaligned_le32(tmp) != opts->ndp_sign) {
+        if (get_unaligned_le32(tmp) != ncm->ndp_sign) {
                 INFO(port->func.config->cdev, "Wrong NDP SIGN\n");
                 goto err;
         }
diff --git a/drivers/usb/gadget/f_obex.c b/drivers/usb/gadget/f_obex.c
index d8dd8782768c..36a004563b82 100644
--- a/drivers/usb/gadget/f_obex.c
+++ b/drivers/usb/gadget/f_obex.c
@@ -406,10 +406,6 @@ static inline bool can_support_obex(struct usb_configuration *c)
  * Context: single threaded during gadget setup
  *
  * Returns zero on success, else negative errno.
- *
- * Caller must have called @gserial_setup() with enough ports to
- * handle all the ones it binds.  Caller is also responsible
- * for calling @gserial_cleanup() before module unload.
  */
 int __init obex_bind_config(struct usb_configuration *c, u8 port_num)
 {
diff --git a/drivers/usb/gadget/f_serial.c b/drivers/usb/gadget/f_serial.c
index 98fa7795df5f..da33cfb3031d 100644
--- a/drivers/usb/gadget/f_serial.c
+++ b/drivers/usb/gadget/f_serial.c
@@ -260,10 +260,6 @@ gser_unbind(struct usb_configuration *c, struct usb_function *f)
  * Context: single threaded during gadget setup
  *
  * Returns zero on success, else negative errno.
- *
- * Caller must have called @gserial_setup() with enough ports to
- * handle all the ones it binds.  Caller is also responsible
- * for calling @gserial_cleanup() before module unload.
  */
 int __init gser_bind_config(struct usb_configuration *c, u8 port_num)
 {
diff --git a/drivers/usb/gadget/f_sourcesink.c b/drivers/usb/gadget/f_sourcesink.c
index 102d49beb9df..41adf3ef96c2 100644
--- a/drivers/usb/gadget/f_sourcesink.c
+++ b/drivers/usb/gadget/f_sourcesink.c
@@ -16,11 +16,12 @@
 #include <linux/kernel.h>
 #include <linux/device.h>
 #include <linux/module.h>
+#include <linux/usb/composite.h>
+#include <linux/err.h>
 
 #include "g_zero.h"
 #include "gadget_chips.h"
 
-
 /*
  * SOURCE/SINK FUNCTION ... a primary testing vehicle for USB peripheral
  * controller drivers.
@@ -62,24 +63,11 @@ static inline struct f_sourcesink *func_to_ss(struct usb_function *f)
 }
 
 static unsigned pattern;
-module_param(pattern, uint, S_IRUGO|S_IWUSR);
-MODULE_PARM_DESC(pattern, "0 = all zeroes, 1 = mod63, 2 = none");
-
-static unsigned isoc_interval = 4;
-module_param(isoc_interval, uint, S_IRUGO|S_IWUSR);
-MODULE_PARM_DESC(isoc_interval, "1 - 16");
-
-static unsigned isoc_maxpacket = 1024;
-module_param(isoc_maxpacket, uint, S_IRUGO|S_IWUSR);
-MODULE_PARM_DESC(isoc_maxpacket, "0 - 1023 (fs), 0 - 1024 (hs/ss)");
-
+static unsigned isoc_interval;
+static unsigned isoc_maxpacket;
 static unsigned isoc_mult;
-module_param(isoc_mult, uint, S_IRUGO|S_IWUSR);
-MODULE_PARM_DESC(isoc_mult, "0 - 2 (hs/ss only)");
-
 static unsigned isoc_maxburst;
-module_param(isoc_maxburst, uint, S_IRUGO|S_IWUSR);
-MODULE_PARM_DESC(isoc_maxburst, "0 - 15 (ss only)");
+static unsigned buflen;
 
 /*-------------------------------------------------------------------------*/
 
@@ -313,7 +301,57 @@ static struct usb_gadget_strings *sourcesink_strings[] = {
 
 /*-------------------------------------------------------------------------*/
 
-static int __init
+struct usb_request *alloc_ep_req(struct usb_ep *ep, int len)
+{
+        struct usb_request      *req;
+
+        req = usb_ep_alloc_request(ep, GFP_ATOMIC);
+        if (req) {
+                if (len)
+                        req->length = len;
+                else
+                        req->length = buflen;
+                req->buf = kmalloc(req->length, GFP_ATOMIC);
+                if (!req->buf) {
+                        usb_ep_free_request(ep, req);
+                        req = NULL;
+                }
+        }
+        return req;
+}
+
+void free_ep_req(struct usb_ep *ep, struct usb_request *req)
+{
+        kfree(req->buf);
+        usb_ep_free_request(ep, req);
+}
+
+static void disable_ep(struct usb_composite_dev *cdev, struct usb_ep *ep)
+{
+        int                     value;
+
+        if (ep->driver_data) {
+                value = usb_ep_disable(ep);
+                if (value < 0)
+                        DBG(cdev, "disable %s --> %d\n",
+                                        ep->name, value);
+                ep->driver_data = NULL;
+        }
+}
+
+void disable_endpoints(struct usb_composite_dev *cdev,
+                struct usb_ep *in, struct usb_ep *out,
+                struct usb_ep *iso_in, struct usb_ep *iso_out)
+{
+        disable_ep(cdev, in);
+        disable_ep(cdev, out);
+        if (iso_in)
+                disable_ep(cdev, iso_in);
+        if (iso_out)
+                disable_ep(cdev, iso_out);
+}
+
+static int
 sourcesink_bind(struct usb_configuration *c, struct usb_function *f)
 {
         struct usb_composite_dev *cdev = c->cdev;
@@ -450,7 +488,7 @@ no_iso:
 }
 
 static void
-sourcesink_unbind(struct usb_configuration *c, struct usb_function *f)
+sourcesink_free_func(struct usb_function *f)
 {
         usb_free_all_descriptors(f);
         kfree(func_to_ss(f));
@@ -531,8 +569,7 @@ static void source_sink_complete(struct usb_ep *ep, struct usb_request *req)
                         check_read_data(ss, req);
                         if (pattern != 2)
                                 memset(req->buf, 0x55, req->length);
-                } else
-                        reinit_write_data(ep, req);
+                }
                 break;
 
         /* this endpoint is normally active while we're configured */
@@ -758,31 +795,10 @@ static void sourcesink_disable(struct usb_function *f)
 
 /*-------------------------------------------------------------------------*/
 
-static int __init sourcesink_bind_config(struct usb_configuration *c)
-{
-        struct f_sourcesink     *ss;
-        int                     status;
-
-        ss = kzalloc(sizeof *ss, GFP_KERNEL);
-        if (!ss)
-                return -ENOMEM;
-
-        ss->function.name = "source/sink";
-        ss->function.bind = sourcesink_bind;
-        ss->function.unbind = sourcesink_unbind;
-        ss->function.set_alt = sourcesink_set_alt;
-        ss->function.get_alt = sourcesink_get_alt;
-        ss->function.disable = sourcesink_disable;
-
-        status = usb_add_function(c, &ss->function);
-        if (status)
-                kfree(ss);
-        return status;
-}
-
-static int sourcesink_setup(struct usb_configuration *c,
+static int sourcesink_setup(struct usb_function *f,
                 const struct usb_ctrlrequest *ctrl)
 {
+        struct usb_configuration        *c = f->config;
         struct usb_request      *req = c->cdev->req;
         int                     value = -EOPNOTSUPP;
         u16                     w_index = le16_to_cpu(ctrl->wIndex);
@@ -851,42 +867,76 @@ unknown:
         return value;
 }
 
-static struct usb_configuration sourcesink_driver = {
-        .label                  = "source/sink",
-        .strings                = sourcesink_strings,
-        .setup                  = sourcesink_setup,
-        .bConfigurationValue    = 3,
-        .bmAttributes           = USB_CONFIG_ATT_SELFPOWER,
-        /* .iConfiguration      = DYNAMIC */
-};
+static struct usb_function *source_sink_alloc_func(
+                struct usb_function_instance *fi)
+{
+        struct f_sourcesink     *ss;
+        struct f_ss_opts        *ss_opts;
 
-/**
- * sourcesink_add - add a source/sink testing configuration to a device
- * @cdev: the device to support the configuration
- */
-int __init sourcesink_add(struct usb_composite_dev *cdev, bool autoresume)
+        ss = kzalloc(sizeof(*ss), GFP_KERNEL);
+        if (!ss)
+                return NULL;
+
+        ss_opts =  container_of(fi, struct f_ss_opts, func_inst);
+        pattern = ss_opts->pattern;
+        isoc_interval = ss_opts->isoc_interval;
+        isoc_maxpacket = ss_opts->isoc_maxpacket;
+        isoc_mult = ss_opts->isoc_mult;
+        isoc_maxburst = ss_opts->isoc_maxburst;
+        buflen = ss_opts->bulk_buflen;
+
+        ss->function.name = "source/sink";
+        ss->function.bind = sourcesink_bind;
+        ss->function.set_alt = sourcesink_set_alt;
+        ss->function.get_alt = sourcesink_get_alt;
+        ss->function.disable = sourcesink_disable;
+        ss->function.setup = sourcesink_setup;
+        ss->function.strings = sourcesink_strings;
+
+        ss->function.free_func = sourcesink_free_func;
+
+        return &ss->function;
+}
+
+static void acm_free_instance(struct usb_function_instance *fi)
 {
-        int id;
+        struct f_ss_opts *ss_opts;
 
-        /* allocate string ID(s) */
-        id = usb_string_id(cdev);
-        if (id < 0)
-                return id;
-        strings_sourcesink[0].id = id;
+        ss_opts = container_of(fi, struct f_ss_opts, func_inst);
+        kfree(ss_opts);
+}
 
-        source_sink_intf_alt0.iInterface = id;
-        source_sink_intf_alt1.iInterface = id;
-        sourcesink_driver.iConfiguration = id;
+static struct usb_function_instance *source_sink_alloc_inst(void)
+{
+        struct f_ss_opts *ss_opts;
 
-        /* support autoresume for remote wakeup testing */
-        if (autoresume)
-                sourcesink_driver.bmAttributes |= USB_CONFIG_ATT_WAKEUP;
+        ss_opts = kzalloc(sizeof(*ss_opts), GFP_KERNEL);
+        if (!ss_opts)
+                return ERR_PTR(-ENOMEM);
+        ss_opts->func_inst.free_func_inst = acm_free_instance;
+        return &ss_opts->func_inst;
+}
+DECLARE_USB_FUNCTION(SourceSink, source_sink_alloc_inst,
+                source_sink_alloc_func);
 
-        /* support OTG systems */
-        if (gadget_is_otg(cdev->gadget)) {
-                sourcesink_driver.descriptors = otg_desc;
-                sourcesink_driver.bmAttributes |= USB_CONFIG_ATT_WAKEUP;
-        }
+static int __init sslb_modinit(void)
+{
+        int ret;
 
-        return usb_add_config(cdev, &sourcesink_driver, sourcesink_bind_config);
+        ret = usb_function_register(&SourceSinkusb_func);
+        if (ret)
+                return ret;
+        ret = lb_modinit();
+        if (ret)
+                usb_function_unregister(&SourceSinkusb_func);
+        return ret;
+}
+static void __exit sslb_modexit(void)
+{
+        usb_function_unregister(&SourceSinkusb_func);
+        lb_modexit();
 }
+module_init(sslb_modinit);
+module_exit(sslb_modexit);
+
+MODULE_LICENSE("GPL");
diff --git a/drivers/usb/gadget/f_uac2.c b/drivers/usb/gadget/f_uac2.c
index d7da258fa3f6..c7468b6c07b0 100644
--- a/drivers/usb/gadget/f_uac2.c
+++ b/drivers/usb/gadget/f_uac2.c
@@ -260,19 +260,14 @@ static int
 uac2_pcm_trigger(struct snd_pcm_substream *substream, int cmd)
 {
         struct snd_uac2_chip *uac2 = snd_pcm_substream_chip(substream);
-        struct audio_dev *agdev = uac2_to_agdev(uac2);
         struct uac2_rtd_params *prm;
         unsigned long flags;
-        struct usb_ep *ep;
         int err = 0;
 
-        if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
-                ep = agdev->in_ep;
+        if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
                 prm = &uac2->p_prm;
-        } else {
-                ep = agdev->out_ep;
+        else
                 prm = &uac2->c_prm;
-        }
 
         spin_lock_irqsave(&prm->lock, flags);
 
diff --git a/drivers/usb/gadget/fsl_qe_udc.c b/drivers/usb/gadget/fsl_qe_udc.c
index ec50f18c8890..034477ce77c6 100644
--- a/drivers/usb/gadget/fsl_qe_udc.c
+++ b/drivers/usb/gadget/fsl_qe_udc.c
@@ -1894,7 +1894,7 @@ static int fsl_qe_stop(struct usb_gadget *gadget,
                 struct usb_gadget_driver *driver);
 
 /* defined in usb_gadget.h */
-static struct usb_gadget_ops qe_gadget_ops = {
+static const struct usb_gadget_ops qe_gadget_ops = {
         .get_frame = qe_get_frame,
         .udc_start = fsl_qe_start,
         .udc_stop = fsl_qe_stop,
diff --git a/drivers/usb/gadget/fsl_udc_core.c b/drivers/usb/gadget/fsl_udc_core.c
index c19f7f13790b..38939561cff3 100644
--- a/drivers/usb/gadget/fsl_udc_core.c
+++ b/drivers/usb/gadget/fsl_udc_core.c
@@ -1254,19 +1254,20 @@ static int fsl_pullup(struct usb_gadget *gadget, int is_on)
         return 0;
 }
 
-static int fsl_start(struct usb_gadget_driver *driver,
-                int (*bind)(struct usb_gadget *, struct usb_gadget_driver *));
-static int fsl_stop(struct usb_gadget_driver *driver);
+static int fsl_udc_start(struct usb_gadget *g,
+                struct usb_gadget_driver *driver);
+static int fsl_udc_stop(struct usb_gadget *g,
+                struct usb_gadget_driver *driver);
 /* defined in gadget.h */
-static struct usb_gadget_ops fsl_gadget_ops = {
+static const struct usb_gadget_ops fsl_gadget_ops = {
         .get_frame = fsl_get_frame,
         .wakeup = fsl_wakeup,
 /*      .set_selfpowered = fsl_set_selfpowered, */ /* Always selfpowered */
         .vbus_session = fsl_vbus_session,
         .vbus_draw = fsl_vbus_draw,
         .pullup = fsl_pullup,
-        .start = fsl_start,
-        .stop = fsl_stop,
+        .udc_start = fsl_udc_start,
+        .udc_stop = fsl_udc_stop,
 };
 
 /* Set protocol stall on ep0, protocol stall will automatically be cleared
@@ -1950,22 +1951,12 @@ static irqreturn_t fsl_udc_irq(int irq, void *_udc)
  * Hook to gadget drivers
  * Called by initialization code of gadget drivers
 *----------------------------------------------------------------*/
-static int fsl_start(struct usb_gadget_driver *driver,
-                int (*bind)(struct usb_gadget *, struct usb_gadget_driver *))
+static int fsl_udc_start(struct usb_gadget *g,
+                struct usb_gadget_driver *driver)
 {
-        int retval = -ENODEV;
+        int retval = 0;
         unsigned long flags = 0;
 
-        if (!udc_controller)
-                return -ENODEV;
-
-        if (!driver || driver->max_speed < USB_SPEED_FULL
-                        || !bind || !driver->disconnect || !driver->setup)
-                return -EINVAL;
-
-        if (udc_controller->driver)
-                return -EBUSY;
-
         /* lock is needed but whether should use this lock or another */
         spin_lock_irqsave(&udc_controller->lock, flags);
 
@@ -1975,15 +1966,6 @@ static int fsl_start(struct usb_gadget_driver *driver,
         udc_controller->gadget.dev.driver = &driver->driver;
         spin_unlock_irqrestore(&udc_controller->lock, flags);
 
-        /* bind udc driver to gadget driver */
-        retval = bind(&udc_controller->gadget, driver);
-        if (retval) {
-                VDBG("bind to %s --> %d", driver->driver.name, retval);
-                udc_controller->gadget.dev.driver = NULL;
-                udc_controller->driver = NULL;
-                goto out;
-        }
-
         if (!IS_ERR_OR_NULL(udc_controller->transceiver)) {
                 /* Suspend the controller until OTG enable it */
                 udc_controller->stopped = 1;
@@ -2009,28 +1991,17 @@ static int fsl_start(struct usb_gadget_driver *driver,
                 udc_controller->ep0_state = WAIT_FOR_SETUP;
                 udc_controller->ep0_dir = 0;
         }
-        printk(KERN_INFO "%s: bind to driver %s\n",
-                        udc_controller->gadget.name, driver->driver.name);
 
-out:
-        if (retval)
-                printk(KERN_WARNING "gadget driver register failed %d\n",
-                       retval);
         return retval;
 }
 
 /* Disconnect from gadget driver */
-static int fsl_stop(struct usb_gadget_driver *driver)
+static int fsl_udc_stop(struct usb_gadget *g,
+                struct usb_gadget_driver *driver)
 {
         struct fsl_ep *loop_ep;
         unsigned long flags;
 
-        if (!udc_controller)
-                return -ENODEV;
-
-        if (!driver || driver != udc_controller->driver || !driver->unbind)
-                return -EINVAL;
-
         if (!IS_ERR_OR_NULL(udc_controller->transceiver))
                 otg_set_peripheral(udc_controller->transceiver->otg, NULL);
 
@@ -2051,16 +2022,9 @@ static int fsl_stop(struct usb_gadget_driver *driver)
                 nuke(loop_ep, -ESHUTDOWN);
         spin_unlock_irqrestore(&udc_controller->lock, flags);
 
-        /* report disconnect; the controller is already quiesced */
-        driver->disconnect(&udc_controller->gadget);
-
-        /* unbind gadget and unhook driver. */
-        driver->unbind(&udc_controller->gadget);
         udc_controller->gadget.dev.driver = NULL;
         udc_controller->driver = NULL;
 
-        printk(KERN_WARNING "unregistered gadget driver '%s'\n",
-               driver->driver.name);
         return 0;
 }
 
diff --git a/drivers/usb/gadget/functions.c b/drivers/usb/gadget/functions.c
new file mode 100644
index 000000000000..b13f839e7368
--- /dev/null
+++ b/drivers/usb/gadget/functions.c
@@ -0,0 +1,116 @@
+#include <linux/kernel.h>
+#include <linux/slab.h>
+#include <linux/module.h>
+#include <linux/err.h>
+
+#include <linux/usb/composite.h>
+
+static LIST_HEAD(func_list);
+static DEFINE_MUTEX(func_lock);
+
+static struct usb_function_instance *try_get_usb_function_instance(const char *name)
+{
+        struct usb_function_driver *fd;
+        struct usb_function_instance *fi;
+
+        fi = ERR_PTR(-ENOENT);
+        mutex_lock(&func_lock);
+        list_for_each_entry(fd, &func_list, list) {
+
+                if (strcmp(name, fd->name))
+                        continue;
+
+                if (!try_module_get(fd->mod)) {
+                        fi = ERR_PTR(-EBUSY);
+                        break;
+                }
+                fi = fd->alloc_inst();
+                if (IS_ERR(fi))
+                        module_put(fd->mod);
+                else
+                        fi->fd = fd;
+                break;
+        }
+        mutex_unlock(&func_lock);
+        return fi;
+}
+
+struct usb_function_instance *usb_get_function_instance(const char *name)
+{
+        struct usb_function_instance *fi;
+        int ret;
+
+        fi = try_get_usb_function_instance(name);
+        if (!IS_ERR(fi))
+                return fi;
+        ret = PTR_ERR(fi);
+        if (ret != -ENOENT)
+                return fi;
+        ret = request_module("usbfunc:%s", name);
+        if (ret < 0)
+                return ERR_PTR(ret);
+        return try_get_usb_function_instance(name);
+}
+EXPORT_SYMBOL_GPL(usb_get_function_instance);
+
+struct usb_function *usb_get_function(struct usb_function_instance *fi)
+{
+        struct usb_function *f;
+
+        f = fi->fd->alloc_func(fi);
+        if (IS_ERR(f))
+                return f;
+        f->fi = fi;
+        return f;
+}
+EXPORT_SYMBOL_GPL(usb_get_function);
+
+void usb_put_function_instance(struct usb_function_instance *fi)
+{
+        struct module *mod;
+
+        if (!fi)
+                return;
+
+        mod = fi->fd->mod;
+        fi->free_func_inst(fi);
+        module_put(mod);
+}
+EXPORT_SYMBOL_GPL(usb_put_function_instance);
+
+void usb_put_function(struct usb_function *f)
+{
+        if (!f)
+                return;
+
+        f->free_func(f);
+}
+EXPORT_SYMBOL_GPL(usb_put_function);
+
+int usb_function_register(struct usb_function_driver *newf)
+{
+        struct usb_function_driver *fd;
+        int ret;
+
+        ret = -EEXIST;
+
+        mutex_lock(&func_lock);
+        list_for_each_entry(fd, &func_list, list) {
+                if (!strcmp(fd->name, newf->name))
+                        goto out;
+        }
+        ret = 0;
+        list_add_tail(&newf->list, &func_list);
+out:
+        mutex_unlock(&func_lock);
+        return ret;
+}
+EXPORT_SYMBOL_GPL(usb_function_register);
+
+void usb_function_unregister(struct usb_function_driver *fd)
+{
+        mutex_lock(&func_lock);
+        list_del(&fd->list);
+        mutex_unlock(&func_lock);
+}
+EXPORT_SYMBOL_GPL(usb_function_unregister);
diff --git a/drivers/usb/gadget/fusb300_udc.c b/drivers/usb/gadget/fusb300_udc.c
index 72cd5e6719db..9fafb00d3c7a 100644
--- a/drivers/usb/gadget/fusb300_udc.c
+++ b/drivers/usb/gadget/fusb300_udc.c
@@ -1308,65 +1308,28 @@ static void init_controller(struct fusb300 *fusb300)
         iowrite32(0xcfffff9f, fusb300->reg + FUSB300_OFFSET_IGER1);
 }
 /*------------------------------------------------------------------------*/
-static struct fusb300 *the_controller;
-
-static int fusb300_udc_start(struct usb_gadget_driver *driver,
-                int (*bind)(struct usb_gadget *, struct usb_gadget_driver *))
+static int fusb300_udc_start(struct usb_gadget *g,
+                struct usb_gadget_driver *driver)
 {
-        struct fusb300 *fusb300 = the_controller;
-        int retval;
-
-        if (!driver
-                        || driver->max_speed < USB_SPEED_FULL
-                        || !bind
-                        || !driver->setup)
-                return -EINVAL;
-
-        if (!fusb300)
-                return -ENODEV;
-
-        if (fusb300->driver)
-                return -EBUSY;
+        struct fusb300 *fusb300 = to_fusb300(g);
 
         /* hook up the driver */
         driver->driver.bus = NULL;
         fusb300->driver = driver;
         fusb300->gadget.dev.driver = &driver->driver;
 
-        retval = device_add(&fusb300->gadget.dev);
-        if (retval) {
-                pr_err("device_add error (%d)\n", retval);
-                goto error;
-        }
-
-        retval = bind(&fusb300->gadget, driver);
-        if (retval) {
-                pr_err("bind to driver error (%d)\n", retval);
-                device_del(&fusb300->gadget.dev);
-                goto error;
-        }
-
         return 0;
-
-error:
-        fusb300->driver = NULL;
-        fusb300->gadget.dev.driver = NULL;
-
-        return retval;
 }
 
-static int fusb300_udc_stop(struct usb_gadget_driver *driver)
+static int fusb300_udc_stop(struct usb_gadget *g,
+                struct usb_gadget_driver *driver)
 {
-        struct fusb300 *fusb300 = the_controller;
-
-        if (driver != fusb300->driver || !driver->unbind)
-                return -EINVAL;
+        struct fusb300 *fusb300 = to_fusb300(g);
 
         driver->unbind(&fusb300->gadget);
         fusb300->gadget.dev.driver = NULL;
 
         init_controller(fusb300);
-        device_del(&fusb300->gadget.dev);
         fusb300->driver = NULL;
 
         return 0;
@@ -1378,10 +1341,10 @@ static int fusb300_udc_pullup(struct usb_gadget *_gadget, int is_active)
         return 0;
 }
 
-static struct usb_gadget_ops fusb300_gadget_ops = {
+static const struct usb_gadget_ops fusb300_gadget_ops = {
         .pullup         = fusb300_udc_pullup,
-        .start          = fusb300_udc_start,
-        .stop           = fusb300_udc_stop,
+        .udc_start      = fusb300_udc_start,
+        .udc_stop       = fusb300_udc_stop,
 };
 
 static int __exit fusb300_remove(struct platform_device *pdev)
@@ -1505,8 +1468,6 @@ static int __init fusb300_probe(struct platform_device *pdev)
         fusb300->gadget.ep0 = &fusb300->ep[0]->ep;
         INIT_LIST_HEAD(&fusb300->gadget.ep0->ep_list);
 
-        the_controller = fusb300;
-
         fusb300->ep0_req = fusb300_alloc_request(&fusb300->ep[0]->ep,
                                 GFP_KERNEL);
         if (fusb300->ep0_req == NULL)
@@ -1517,9 +1478,19 @@ static int __init fusb300_probe(struct platform_device *pdev)
         if (ret)
                 goto err_add_udc;
 
+        ret = device_add(&fusb300->gadget.dev);
+        if (ret) {
+                pr_err("device_add error (%d)\n", ret);
+                goto err_add_device;
+        }
+
         dev_info(&pdev->dev, "version %s\n", DRIVER_VERSION);
 
         return 0;
+
+err_add_device:
+        usb_del_gadget_udc(&fusb300->gadget);
+
 err_add_udc:
         fusb300_free_request(&fusb300->ep[0]->ep, fusb300->ep0_req);
 
diff --git a/drivers/usb/gadget/fusb300_udc.h b/drivers/usb/gadget/fusb300_udc.h
index 542cd83cc806..6ba444ae8dd5 100644
--- a/drivers/usb/gadget/fusb300_udc.h
+++ b/drivers/usb/gadget/fusb300_udc.h
@@ -673,4 +673,6 @@ struct fusb300 {
         u8                      reenum;         /* if re-enumeration */
 };
 
+#define to_fusb300(g)           (container_of((g), struct fusb300, gadget))
+
 #endif
diff --git a/drivers/usb/gadget/g_zero.h b/drivers/usb/gadget/g_zero.h
index 71ca193358b8..ef3e8515272b 100644
--- a/drivers/usb/gadget/g_zero.h
+++ b/drivers/usb/gadget/g_zero.h
@@ -6,11 +6,34 @@
 #ifndef __G_ZERO_H
 #define __G_ZERO_H
 
-#include <linux/usb/composite.h>
+struct usb_zero_options {
+        unsigned pattern;
+        unsigned isoc_interval;
+        unsigned isoc_maxpacket;
+        unsigned isoc_mult;
+        unsigned isoc_maxburst;
+        unsigned bulk_buflen;
+        unsigned qlen;
+};
 
-/* global state */
-extern unsigned buflen;
-extern const struct usb_descriptor_header *otg_desc[];
+struct f_ss_opts {
+        struct usb_function_instance func_inst;
+        unsigned pattern;
+        unsigned isoc_interval;
+        unsigned isoc_maxpacket;
+        unsigned isoc_mult;
+        unsigned isoc_maxburst;
+        unsigned bulk_buflen;
+};
+
+struct f_lb_opts {
+        struct usb_function_instance func_inst;
+        unsigned bulk_buflen;
+        unsigned qlen;
+};
+
+void lb_modexit(void);
+int lb_modinit(void);
 
 /* common utilities */
 struct usb_request *alloc_ep_req(struct usb_ep *ep, int len);
@@ -19,8 +42,4 @@ void disable_endpoints(struct usb_composite_dev *cdev,
                 struct usb_ep *in, struct usb_ep *out,
                 struct usb_ep *iso_in, struct usb_ep *iso_out);
 
-/* configuration-specific linkup */
-int sourcesink_add(struct usb_composite_dev *cdev, bool autoresume);
-int loopback_add(struct usb_composite_dev *cdev, bool autoresume);
-
 #endif /* __G_ZERO_H */
diff --git a/drivers/usb/gadget/gmidi.c b/drivers/usb/gadget/gmidi.c
index 881aab86ae99..e879e2c9f461 100644
--- a/drivers/usb/gadget/gmidi.c
+++ b/drivers/usb/gadget/gmidi.c
@@ -125,7 +125,7 @@ static struct usb_configuration midi_config = {
         .bConfigurationValue = 1,
         /* .iConfiguration = DYNAMIC */
         .bmAttributes   = USB_CONFIG_ATT_ONE,
-        .bMaxPower      = CONFIG_USB_GADGET_VBUS_DRAW / 2,
+        .MaxPower       = CONFIG_USB_GADGET_VBUS_DRAW,
 };
 
 static int __init midi_bind_config(struct usb_configuration *c)
diff --git a/drivers/usb/gadget/goku_udc.c b/drivers/usb/gadget/goku_udc.c
index 51037cb78604..85742d4c67df 100644
--- a/drivers/usb/gadget/goku_udc.c
+++ b/drivers/usb/gadget/goku_udc.c
@@ -993,14 +993,15 @@ static int goku_get_frame(struct usb_gadget *_gadget)
         return -EOPNOTSUPP;
 }
 
-static int goku_start(struct usb_gadget_driver *driver,
-                int (*bind)(struct usb_gadget *, struct usb_gadget_driver *));
-static int goku_stop(struct usb_gadget_driver *driver);
+static int goku_udc_start(struct usb_gadget *g,
+                struct usb_gadget_driver *driver);
+static int goku_udc_stop(struct usb_gadget *g,
+                struct usb_gadget_driver *driver);
 
 static const struct usb_gadget_ops goku_ops = {
         .get_frame      = goku_get_frame,
-        .start          = goku_start,
-        .stop           = goku_stop,
+        .udc_start      = goku_udc_start,
+        .udc_stop       = goku_udc_stop,
         // no remote wakeup
         // not selfpowered
 };
@@ -1339,50 +1340,28 @@ static void udc_enable(struct goku_udc *dev)
  * - one function driver, initted second
  */
 
-static struct goku_udc  *the_controller;
-
 /* when a driver is successfully registered, it will receive
  * control requests including set_configuration(), which enables
  * non-control requests.  then usb traffic follows until a
  * disconnect is reported.  then a host may connect again, or
  * the driver might get unbound.
  */
-static int goku_start(struct usb_gadget_driver *driver,
-                int (*bind)(struct usb_gadget *, struct usb_gadget_driver *))
+static int goku_udc_start(struct usb_gadget *g,
+                struct usb_gadget_driver *driver)
 {
-        struct goku_udc *dev = the_controller;
-        int                     retval;
-
-        if (!driver
-                        || driver->max_speed < USB_SPEED_FULL
-                        || !bind
-                        || !driver->disconnect
-                        || !driver->setup)
-                return -EINVAL;
-        if (!dev)
-                return -ENODEV;
-        if (dev->driver)
-                return -EBUSY;
+        struct goku_udc *dev = to_goku_udc(g);
 
         /* hook up the driver */
         driver->driver.bus = NULL;
         dev->driver = driver;
         dev->gadget.dev.driver = &driver->driver;
-        retval = bind(&dev->gadget, driver);
-        if (retval) {
-                DBG(dev, "bind to driver %s --> error %d\n",
-                                driver->driver.name, retval);
-                dev->driver = NULL;
-                dev->gadget.dev.driver = NULL;
-                return retval;
-        }
 
-        /* then enable host detection and ep0; and we're ready
+        /*
+         * then enable host detection and ep0; and we're ready
          * for set_configuration as well as eventual disconnect.
          */
         udc_enable(dev);
 
-        DBG(dev, "registered gadget driver '%s'\n", driver->driver.name);
         return 0;
 }
 
@@ -1400,35 +1379,23 @@ stop_activity(struct goku_udc *dev, struct usb_gadget_driver *driver)
         udc_reset (dev);
         for (i = 0; i < 4; i++)
                 nuke(&dev->ep [i], -ESHUTDOWN);
-        if (driver) {
-                spin_unlock(&dev->lock);
-                driver->disconnect(&dev->gadget);
-                spin_lock(&dev->lock);
-        }
 
         if (dev->driver)
                 udc_enable(dev);
 }
 
-static int goku_stop(struct usb_gadget_driver *driver)
+static int goku_udc_stop(struct usb_gadget *g,
+                struct usb_gadget_driver *driver)
 {
-        struct goku_udc *dev = the_controller;
+        struct goku_udc *dev = to_goku_udc(g);
         unsigned long   flags;
 
-        if (!dev)
-                return -ENODEV;
-        if (!driver || driver != dev->driver || !driver->unbind)
-                return -EINVAL;
-
         spin_lock_irqsave(&dev->lock, flags);
         dev->driver = NULL;
         stop_activity(dev, driver);
         spin_unlock_irqrestore(&dev->lock, flags);
-
-        driver->unbind(&dev->gadget);
         dev->gadget.dev.driver = NULL;
 
-        DBG(dev, "unregistered driver '%s'\n", driver->driver.name);
         return 0;
 }
 
@@ -1754,7 +1721,6 @@ static void goku_remove(struct pci_dev *pdev)
 
         pci_set_drvdata(pdev, NULL);
         dev->regs = NULL;
-        the_controller = NULL;
 
         INFO(dev, "unbind\n");
 }
@@ -1770,13 +1736,6 @@ static int goku_probe(struct pci_dev *pdev, const struct pci_device_id *id)
         void __iomem            *base = NULL;
         int                     retval;
 
-        /* if you want to support more than one controller in a system,
-         * usb_gadget_driver_{register,unregister}() must change.
-         */
-        if (the_controller) {
-                pr_warning("ignoring %s\n", pci_name(pdev));
-                return -EBUSY;
-        }
         if (!pdev->irq) {
                 printk(KERN_ERR "Check PCI %s IRQ setup!\n", pci_name(pdev));
                 retval = -ENODEV;
@@ -1851,7 +1810,6 @@ static int goku_probe(struct pci_dev *pdev, const struct pci_device_id *id)
         create_proc_read_entry(proc_node_name, 0, NULL, udc_proc_read, dev);
 #endif
 
-        the_controller = dev;
         retval = device_register(&dev->gadget.dev);
         if (retval) {
                 put_device(&dev->gadget.dev);
diff --git a/drivers/usb/gadget/goku_udc.h b/drivers/usb/gadget/goku_udc.h
index 85cdce0d1901..b4470d2b1d86 100644
--- a/drivers/usb/gadget/goku_udc.h
+++ b/drivers/usb/gadget/goku_udc.h
@@ -261,6 +261,7 @@ struct goku_udc {
         /* statistics... */
         unsigned long                   irqs;
 };
+#define to_goku_udc(g)          (container_of((g), struct goku_udc, gadget))
 
 /*-------------------------------------------------------------------------*/
 
diff --git a/drivers/usb/gadget/m66592-udc.c b/drivers/usb/gadget/m66592-udc.c
index b6401f1b56ce..34a0cb9382dc 100644
--- a/drivers/usb/gadget/m66592-udc.c
+++ b/drivers/usb/gadget/m66592-udc.c
@@ -1463,42 +1463,16 @@ static struct usb_ep_ops m66592_ep_ops = {
 };
 
 /*-------------------------------------------------------------------------*/
-static struct m66592 *the_controller;
-
-static int m66592_start(struct usb_gadget_driver *driver,
-                int (*bind)(struct usb_gadget *, struct usb_gadget_driver *))
+static int m66592_udc_start(struct usb_gadget *g,
+                struct usb_gadget_driver *driver)
 {
-        struct m66592 *m66592 = the_controller;
-        int retval;
-
-        if (!driver
-                        || driver->max_speed < USB_SPEED_HIGH
-                        || !bind
-                        || !driver->setup)
-                return -EINVAL;
-        if (!m66592)
-                return -ENODEV;
-        if (m66592->driver)
-                return -EBUSY;
+        struct m66592 *m66592 = to_m66592(g);
 
         /* hook up the driver */
         driver->driver.bus = NULL;
         m66592->driver = driver;
         m66592->gadget.dev.driver = &driver->driver;
 
-        retval = device_add(&m66592->gadget.dev);
-        if (retval) {
-                pr_err("device_add error (%d)\n", retval);
-                goto error;
-        }
-
-        retval = bind(&m66592->gadget, driver);
-        if (retval) {
-                pr_err("bind to driver error (%d)\n", retval);
-                device_del(&m66592->gadget.dev);
-                goto error;
-        }
-
         m66592_bset(m66592, M66592_VBSE | M66592_URST, M66592_INTENB0);
         if (m66592_read(m66592, M66592_INTSTS0) & M66592_VBSTS) {
                 m66592_start_xclock(m66592);
@@ -1510,26 +1484,12 @@ static int m66592_start(struct usb_gadget_driver *driver,
         }
 
         return 0;
-
-error:
-        m66592->driver = NULL;
-        m66592->gadget.dev.driver = NULL;
-
-        return retval;
 }
 
-static int m66592_stop(struct usb_gadget_driver *driver)
+static int m66592_udc_stop(struct usb_gadget *g,
+                struct usb_gadget_driver *driver)
 {
-        struct m66592 *m66592 = the_controller;
-        unsigned long flags;
-
-        if (driver != m66592->driver || !driver->unbind)
-                return -EINVAL;
-
-        spin_lock_irqsave(&m66592->lock, flags);
-        if (m66592->gadget.speed != USB_SPEED_UNKNOWN)
-                m66592_usb_disconnect(m66592);
-        spin_unlock_irqrestore(&m66592->lock, flags);
+        struct m66592 *m66592 = to_m66592(g);
 
         m66592_bclr(m66592, M66592_VBSE | M66592_URST, M66592_INTENB0);
 
@@ -1539,8 +1499,8 @@ static int m66592_stop(struct usb_gadget_driver *driver)
         init_controller(m66592);
         disable_controller(m66592);
 
-        device_del(&m66592->gadget.dev);
         m66592->driver = NULL;
+
         return 0;
 }
 
@@ -1566,10 +1526,10 @@ static int m66592_pullup(struct usb_gadget *gadget, int is_on)
         return 0;
 }
 
-static struct usb_gadget_ops m66592_gadget_ops = {
+static const struct usb_gadget_ops m66592_gadget_ops = {
         .get_frame              = m66592_get_frame,
-        .start                  = m66592_start,
-        .stop                   = m66592_stop,
+        .udc_start              = m66592_udc_start,
+        .udc_stop               = m66592_udc_stop,
         .pullup                 = m66592_pullup,
 };
 
@@ -1578,6 +1538,7 @@ static int __exit m66592_remove(struct platform_device *pdev)
         struct m66592           *m66592 = dev_get_drvdata(&pdev->dev);
 
         usb_del_gadget_udc(&m66592->gadget);
+        device_del(&m66592->gadget.dev);
 
         del_timer_sync(&m66592->timer);
         iounmap(m66592->reg);
@@ -1706,8 +1667,6 @@ static int __init m66592_probe(struct platform_device *pdev)
         m66592->pipenum2ep[0] = &m66592->ep[0];
         m66592->epaddr2ep[0] = &m66592->ep[0];
 
-        the_controller = m66592;
-
         m66592->ep0_req = m66592_alloc_request(&m66592->ep[0].ep, GFP_KERNEL);
         if (m66592->ep0_req == NULL)
                 goto clean_up3;
@@ -1715,6 +1674,12 @@ static int __init m66592_probe(struct platform_device *pdev)
 
         init_controller(m66592);
 
+        ret = device_add(&m66592->gadget.dev);
+        if (ret) {
+                pr_err("device_add error (%d)\n", ret);
+                goto err_device_add;
+        }
+
         ret = usb_add_gadget_udc(&pdev->dev, &m66592->gadget);
         if (ret)
                 goto err_add_udc;
@@ -1723,6 +1688,9 @@ static int __init m66592_probe(struct platform_device *pdev)
         return 0;
 
 err_add_udc:
+        device_del(&m66592->gadget.dev);
+
+err_device_add:
         m66592_free_request(&m66592->ep[0].ep, m66592->ep0_req);
 
 clean_up3:
diff --git a/drivers/usb/gadget/m66592-udc.h b/drivers/usb/gadget/m66592-udc.h
index 16c7e14678b8..96d49d7bfb6b 100644
--- a/drivers/usb/gadget/m66592-udc.h
+++ b/drivers/usb/gadget/m66592-udc.h
@@ -492,6 +492,7 @@ struct m66592 {
         int isochronous;
         int num_dma;
 };
+#define to_m66592(g)    (container_of((g), struct m66592, gadget))
 
 #define gadget_to_m66592(_gadget) container_of(_gadget, struct m66592, gadget)
 #define m66592_to_gadget(m66592) (&m66592->gadget)
diff --git a/drivers/usb/gadget/multi.c b/drivers/usb/gadget/multi.c
index 88472bf7dbb7..20bbbf917fc2 100644
--- a/drivers/usb/gadget/multi.c
+++ b/drivers/usb/gadget/multi.c
@@ -16,6 +16,7 @@
 #include <linux/kernel.h>
 #include <linux/module.h>
 
+#include "u_serial.h"
 #if defined USB_ETH_RNDIS
 #  undef USB_ETH_RNDIS
 #endif
@@ -42,9 +43,6 @@ MODULE_LICENSE("GPL");
  */
 #include "f_mass_storage.c"
 
-#include "u_serial.c"
-#include "f_acm.c"
-
 #include "f_ecm.c"
 #include "f_subset.c"
 #ifdef USB_ETH_RNDIS
@@ -137,10 +135,13 @@ static struct fsg_common fsg_common;
 
 static u8 hostaddr[ETH_ALEN];
 
+static unsigned char tty_line;
+static struct usb_function_instance *fi_acm;
 
 /********** RNDIS **********/
 
 #ifdef USB_ETH_RNDIS
+static struct usb_function *f_acm_rndis;
 
 static __init int rndis_do_config(struct usb_configuration *c)
 {
@@ -155,15 +156,25 @@ static __init int rndis_do_config(struct usb_configuration *c)
         if (ret < 0)
                 return ret;
 
-        ret = acm_bind_config(c, 0);
-        if (ret < 0)
-                return ret;
+        f_acm_rndis = usb_get_function(fi_acm);
+        if (IS_ERR(f_acm_rndis))
+                goto err_func_acm;
+
+        ret = usb_add_function(c, f_acm_rndis);
+        if (ret)
+                goto err_conf;
 
         ret = fsg_bind_config(c->cdev, c, &fsg_common);
         if (ret < 0)
-                return ret;
+                goto err_fsg;
 
         return 0;
+err_fsg:
+        usb_remove_function(c, f_acm_rndis);
+err_conf:
+        usb_put_function(f_acm_rndis);
+err_func_acm:
+        return ret;
 }
 
 static int rndis_config_register(struct usb_composite_dev *cdev)
@@ -192,6 +203,7 @@ static int rndis_config_register(struct usb_composite_dev *cdev)
 /********** CDC ECM **********/
 
 #ifdef CONFIG_USB_G_MULTI_CDC
+static struct usb_function *f_acm_multi;
 
 static __init int cdc_do_config(struct usb_configuration *c)
 {
@@ -206,15 +218,26 @@ static __init int cdc_do_config(struct usb_configuration *c)
         if (ret < 0)
                 return ret;
 
-        ret = acm_bind_config(c, 0);
-        if (ret < 0)
-                return ret;
+        /* implicit port_num is zero */
+        f_acm_multi = usb_get_function(fi_acm);
+        if (IS_ERR(f_acm_multi))
+                goto err_func_acm;
+
+        ret = usb_add_function(c, f_acm_multi);
+        if (ret)
+                goto err_conf;
 
         ret = fsg_bind_config(c->cdev, c, &fsg_common);
         if (ret < 0)
-                return ret;
+                goto err_fsg;
 
         return 0;
+err_fsg:
+        usb_remove_function(c, f_acm_multi);
+err_conf:
+        usb_put_function(f_acm_multi);
+err_func_acm:
+        return ret;
 }
 
 static int cdc_config_register(struct usb_composite_dev *cdev)
@@ -243,10 +266,10 @@ static int cdc_config_register(struct usb_composite_dev *cdev)
 
 /****************************** Gadget Bind ******************************/
 
-
 static int __ref multi_bind(struct usb_composite_dev *cdev)
 {
         struct usb_gadget *gadget = cdev->gadget;
+        struct f_serial_opts *opts;
         int status;
 
         if (!can_support_ecm(cdev->gadget)) {
@@ -261,10 +284,19 @@ static int __ref multi_bind(struct usb_composite_dev *cdev)
                 return status;
 
         /* set up serial link layer */
-        status = gserial_setup(cdev->gadget, 1);
+        status = gserial_alloc_line(&tty_line);
         if (status < 0)
                 goto fail0;
 
+        fi_acm = usb_get_function_instance("acm");
+        if (IS_ERR(fi_acm)) {
+                status = PTR_ERR(fi_acm);
+                goto fail0dot5;
+        }
+
+        opts = container_of(fi_acm, struct f_serial_opts, func_inst);
+        opts->port_num = tty_line;
+
         /* set up mass storage function */
         {
                 void *retp;
@@ -301,7 +333,9 @@ static int __ref multi_bind(struct usb_composite_dev *cdev)
 fail2:
         fsg_common_put(&fsg_common);
 fail1:
-        gserial_cleanup();
+        usb_put_function_instance(fi_acm);
+fail0dot5:
+        gserial_free_line(tty_line);
 fail0:
         gether_cleanup();
         return status;
@@ -309,7 +343,14 @@ fail0:
 
 static int __exit multi_unbind(struct usb_composite_dev *cdev)
 {
-        gserial_cleanup();
+#ifdef CONFIG_USB_G_MULTI_CDC
+        usb_put_function(f_acm_multi);
+#endif
+#ifdef USB_ETH_RNDIS
+        usb_put_function(f_acm_rndis);
+#endif
+        usb_put_function_instance(fi_acm);
+        gserial_free_line(tty_line);
         gether_cleanup();
         return 0;
 }
diff --git a/drivers/usb/gadget/mv_udc_core.c b/drivers/usb/gadget/mv_udc_core.c
index 6e8b1272ebce..c8cf959057fe 100644
--- a/drivers/usb/gadget/mv_udc_core.c
+++ b/drivers/usb/gadget/mv_udc_core.c
@@ -61,9 +61,6 @@ static DECLARE_COMPLETION(release_done);
 static const char driver_name[] = "mv_udc";
 static const char driver_desc[] = DRIVER_DESC;
 
-/* controller device global variable */
-static struct mv_udc    *the_controller;
-
 static void nuke(struct mv_ep *ep, int status);
 static void stop_activity(struct mv_udc *udc, struct usb_gadget_driver *driver);
 
@@ -1268,9 +1265,8 @@ static int mv_udc_pullup(struct usb_gadget *gadget, int is_on)
         return retval;
 }
 
-static int mv_udc_start(struct usb_gadget_driver *driver,
-                int (*bind)(struct usb_gadget *, struct usb_gadget_driver *));
-static int mv_udc_stop(struct usb_gadget_driver *driver);
+static int mv_udc_start(struct usb_gadget *, struct usb_gadget_driver *);
+static int mv_udc_stop(struct usb_gadget *, struct usb_gadget_driver *);
 /* device controller usb_gadget_ops structure */
 static const struct usb_gadget_ops mv_ops = {
 
@@ -1285,8 +1281,8 @@ static const struct usb_gadget_ops mv_ops = {
 
         /* D+ pullup, software-controlled connect/disconnect to USB host */
         .pullup         = mv_udc_pullup,
-        .start          = mv_udc_start,
-        .stop           = mv_udc_stop,
+        .udc_start      = mv_udc_start,
+        .udc_stop       = mv_udc_stop,
 };
 
 static int eps_init(struct mv_udc *udc)
@@ -1373,15 +1369,14 @@ static void stop_activity(struct mv_udc *udc, struct usb_gadget_driver *driver)
         }
 }
 
-static int mv_udc_start(struct usb_gadget_driver *driver,
-                int (*bind)(struct usb_gadget *, struct usb_gadget_driver *))
+static int mv_udc_start(struct usb_gadget *gadget,
+                struct usb_gadget_driver *driver)
 {
-        struct mv_udc *udc = the_controller;
+        struct mv_udc *udc;
         int retval = 0;
         unsigned long flags;
 
-        if (!udc)
-                return -ENODEV;
+        udc = container_of(gadget, struct mv_udc, gadget);
 
         if (udc->driver)
                 return -EBUSY;
@@ -1399,26 +1394,14 @@ static int mv_udc_start(struct usb_gadget_driver *driver,
 
         spin_unlock_irqrestore(&udc->lock, flags);
 
-        retval = bind(&udc->gadget, driver);
-        if (retval) {
-                dev_err(&udc->dev->dev, "bind to driver %s --> %d\n",
-                                driver->driver.name, retval);
-                udc->driver = NULL;
-                udc->gadget.dev.driver = NULL;
-                return retval;
-        }
-
-        if (!IS_ERR_OR_NULL(udc->transceiver)) {
+        if (udc->transceiver) {
                 retval = otg_set_peripheral(udc->transceiver->otg,
                                         &udc->gadget);
                 if (retval) {
                         dev_err(&udc->dev->dev,
                                 "unable to register peripheral to otg\n");
-                        if (driver->unbind) {
-                                driver->unbind(&udc->gadget);
-                                udc->gadget.dev.driver = NULL;
-                                udc->driver = NULL;
-                        }
+                        udc->driver = NULL;
+                        udc->gadget.dev.driver = NULL;
                         return retval;
                 }
         }
@@ -1433,13 +1416,13 @@ static int mv_udc_start(struct usb_gadget_driver *driver,
         return 0;
 }
 
-static int mv_udc_stop(struct usb_gadget_driver *driver)
+static int mv_udc_stop(struct usb_gadget *gadget,
+                struct usb_gadget_driver *driver)
 {
-        struct mv_udc *udc = the_controller;
+        struct mv_udc *udc;
         unsigned long flags;
 
-        if (!udc)
-                return -ENODEV;
+        udc = container_of(gadget, struct mv_udc, gadget);
 
         spin_lock_irqsave(&udc->lock, flags);
 
@@ -1454,7 +1437,6 @@ static int mv_udc_stop(struct usb_gadget_driver *driver)
         spin_unlock_irqrestore(&udc->lock, flags);
 
         /* unbind gadget driver */
-        driver->unbind(&udc->gadget);
         udc->gadget.dev.driver = NULL;
         udc->driver = NULL;
 
@@ -1472,10 +1454,13 @@ static void mv_set_ptc(struct mv_udc *udc, u32 mode)
 
 static void prime_status_complete(struct usb_ep *ep, struct usb_request *_req)
 {
-        struct mv_udc *udc = the_controller;
+        struct mv_ep *mvep = container_of(ep, struct mv_ep, ep);
         struct mv_req *req = container_of(_req, struct mv_req, req);
+        struct mv_udc *udc;
         unsigned long flags;
 
+        udc = mvep->udc;
+
         dev_info(&udc->dev->dev, "switch to test mode %d\n", req->test_mode);
 
         spin_lock_irqsave(&udc->lock, flags);
@@ -2123,15 +2108,18 @@ static void mv_udc_vbus_work(struct work_struct *work)
 /* release device structure */
 static void gadget_release(struct device *_dev)
 {
-        struct mv_udc *udc = the_controller;
+        struct mv_udc *udc;
+
+        udc = dev_get_drvdata(_dev);
 
         complete(udc->done);
 }
 
-static int mv_udc_remove(struct platform_device *dev)
+static int mv_udc_remove(struct platform_device *pdev)
 {
-        struct mv_udc *udc = the_controller;
-        int clk_i;
+        struct mv_udc *udc;
+
+        udc = platform_get_drvdata(pdev);
 
         usb_del_gadget_udc(&udc->gadget);
 
@@ -2140,57 +2128,27 @@ static int mv_udc_remove(struct platform_device *dev)
                 destroy_workqueue(udc->qwork);
         }
 
-        /*
-         * If we have transceiver inited,
-         * then vbus irq will not be requested in udc driver.
-         */
-        if (udc->pdata && udc->pdata->vbus
-                && udc->clock_gating && IS_ERR_OR_NULL(udc->transceiver))
-                free_irq(udc->pdata->vbus->irq, &dev->dev);
-
         /* free memory allocated in probe */
         if (udc->dtd_pool)
                 dma_pool_destroy(udc->dtd_pool);
 
         if (udc->ep_dqh)
-                dma_free_coherent(&dev->dev, udc->ep_dqh_size,
+                dma_free_coherent(&pdev->dev, udc->ep_dqh_size,
                         udc->ep_dqh, udc->ep_dqh_dma);
 
-        kfree(udc->eps);
-
-        if (udc->irq)
-                free_irq(udc->irq, &dev->dev);
-
         mv_udc_disable(udc);
 
-        if (udc->cap_regs)
-                iounmap(udc->cap_regs);
-
-        if (udc->phy_regs)
-                iounmap(udc->phy_regs);
-
-        if (udc->status_req) {
-                kfree(udc->status_req->req.buf);
-                kfree(udc->status_req);
-        }
-
-        for (clk_i = 0; clk_i <= udc->clknum; clk_i++)
-                clk_put(udc->clk[clk_i]);
-
         device_unregister(&udc->gadget.dev);
 
         /* free dev, wait for the release() finished */
         wait_for_completion(udc->done);
-        kfree(udc);
-
-        the_controller = NULL;
 
         return 0;
 }
 
-static int mv_udc_probe(struct platform_device *dev)
+static int mv_udc_probe(struct platform_device *pdev)
 {
-        struct mv_usb_platform_data *pdata = dev->dev.platform_data;
+        struct mv_usb_platform_data *pdata = pdev->dev.platform_data;
         struct mv_udc *udc;
         int retval = 0;
         int clk_i = 0;
@@ -2198,71 +2156,73 @@ static int mv_udc_probe(struct platform_device *dev)
         size_t size;
 
         if (pdata == NULL) {
-                dev_err(&dev->dev, "missing platform_data\n");
+                dev_err(&pdev->dev, "missing platform_data\n");
                 return -ENODEV;
         }
 
         size = sizeof(*udc) + sizeof(struct clk *) * pdata->clknum;
-        udc = kzalloc(size, GFP_KERNEL);
+        udc = devm_kzalloc(&pdev->dev, size, GFP_KERNEL);
         if (udc == NULL) {
-                dev_err(&dev->dev, "failed to allocate memory for udc\n");
+                dev_err(&pdev->dev, "failed to allocate memory for udc\n");
                 return -ENOMEM;
         }
 
-        the_controller = udc;
         udc->done = &release_done;
-        udc->pdata = dev->dev.platform_data;
+        udc->pdata = pdev->dev.platform_data;
         spin_lock_init(&udc->lock);
 
-        udc->dev = dev;
+        udc->dev = pdev;
 
 #ifdef CONFIG_USB_OTG_UTILS
-        if (pdata->mode == MV_USB_MODE_OTG)
-                udc->transceiver = usb_get_phy(USB_PHY_TYPE_USB2);
+        if (pdata->mode == MV_USB_MODE_OTG) {
+                udc->transceiver = devm_usb_get_phy(&pdev->dev,
+                                        USB_PHY_TYPE_USB2);
+                if (IS_ERR_OR_NULL(udc->transceiver)) {
+                        udc->transceiver = NULL;
+                        return -ENODEV;
+                }
+        }
 #endif
 
         udc->clknum = pdata->clknum;
         for (clk_i = 0; clk_i < udc->clknum; clk_i++) {
-                udc->clk[clk_i] = clk_get(&dev->dev, pdata->clkname[clk_i]);
+                udc->clk[clk_i] = devm_clk_get(&pdev->dev,
+                                        pdata->clkname[clk_i]);
                 if (IS_ERR(udc->clk[clk_i])) {
                         retval = PTR_ERR(udc->clk[clk_i]);
-                        goto err_put_clk;
+                        return retval;
                 }
         }
 
         r = platform_get_resource_byname(udc->dev, IORESOURCE_MEM, "capregs");
         if (r == NULL) {
-                dev_err(&dev->dev, "no I/O memory resource defined\n");
-                retval = -ENODEV;
-                goto err_put_clk;
+                dev_err(&pdev->dev, "no I/O memory resource defined\n");
+                return -ENODEV;
         }
 
         udc->cap_regs = (struct mv_cap_regs __iomem *)
-                ioremap(r->start, resource_size(r));
+                devm_ioremap(&pdev->dev, r->start, resource_size(r));
         if (udc->cap_regs == NULL) {
-                dev_err(&dev->dev, "failed to map I/O memory\n");
-                retval = -EBUSY;
-                goto err_put_clk;
+                dev_err(&pdev->dev, "failed to map I/O memory\n");
+                return -EBUSY;
         }
 
         r = platform_get_resource_byname(udc->dev, IORESOURCE_MEM, "phyregs");
         if (r == NULL) {
-                dev_err(&dev->dev, "no phy I/O memory resource defined\n");
-                retval = -ENODEV;
-                goto err_iounmap_capreg;
+                dev_err(&pdev->dev, "no phy I/O memory resource defined\n");
+                return -ENODEV;
         }
 
         udc->phy_regs = ioremap(r->start, resource_size(r));
         if (udc->phy_regs == NULL) {
-                dev_err(&dev->dev, "failed to map phy I/O memory\n");
-                retval = -EBUSY;
-                goto err_iounmap_capreg;
+                dev_err(&pdev->dev, "failed to map phy I/O memory\n");
+                return -EBUSY;
         }
 
         /* we will acces controller register, so enable the clk */
         retval = mv_udc_enable_internal(udc);
         if (retval)
-                goto err_iounmap_phyreg;
+                return retval;
 
         udc->op_regs =
                 (struct mv_op_regs __iomem *)((unsigned long)udc->cap_regs
@@ -2279,11 +2239,11 @@ static int mv_udc_probe(struct platform_device *dev)
 
         size = udc->max_eps * sizeof(struct mv_dqh) *2;
         size = (size + DQH_ALIGNMENT - 1) & ~(DQH_ALIGNMENT - 1);
-        udc->ep_dqh = dma_alloc_coherent(&dev->dev, size,
+        udc->ep_dqh = dma_alloc_coherent(&pdev->dev, size,
                                         &udc->ep_dqh_dma, GFP_KERNEL);
 
         if (udc->ep_dqh == NULL) {
-                dev_err(&dev->dev, "allocate dQH memory failed\n");
+                dev_err(&pdev->dev, "allocate dQH memory failed\n");
                 retval = -ENOMEM;
                 goto err_disable_clock;
         }
@@ -2291,7 +2251,7 @@ static int mv_udc_probe(struct platform_device *dev)
 
         /* create dTD dma_pool resource */
         udc->dtd_pool = dma_pool_create("mv_dtd",
-                        &dev->dev,
+                        &pdev->dev,
                         sizeof(struct mv_dtd),
                         DTD_ALIGNMENT,
                         DMA_BOUNDARY);
@@ -2302,19 +2262,20 @@ static int mv_udc_probe(struct platform_device *dev)
         }
 
         size = udc->max_eps * sizeof(struct mv_ep) *2;
-        udc->eps = kzalloc(size, GFP_KERNEL);
+        udc->eps = devm_kzalloc(&pdev->dev, size, GFP_KERNEL);
         if (udc->eps == NULL) {
-                dev_err(&dev->dev, "allocate ep memory failed\n");
+                dev_err(&pdev->dev, "allocate ep memory failed\n");
                 retval = -ENOMEM;
                 goto err_destroy_dma;
         }
 
         /* initialize ep0 status request structure */
-        udc->status_req = kzalloc(sizeof(struct mv_req), GFP_KERNEL);
+        udc->status_req = devm_kzalloc(&pdev->dev, sizeof(struct mv_req),
+                                        GFP_KERNEL);
         if (!udc->status_req) {
-                dev_err(&dev->dev, "allocate status_req memory failed\n");
+                dev_err(&pdev->dev, "allocate status_req memory failed\n");
                 retval = -ENOMEM;
-                goto err_free_eps;
+                goto err_destroy_dma;
         }
         INIT_LIST_HEAD(&udc->status_req->queue);
 
@@ -2329,17 +2290,17 @@ static int mv_udc_probe(struct platform_device *dev)
 
         r = platform_get_resource(udc->dev, IORESOURCE_IRQ, 0);
         if (r == NULL) {
-                dev_err(&dev->dev, "no IRQ resource defined\n");
+                dev_err(&pdev->dev, "no IRQ resource defined\n");
                 retval = -ENODEV;
-                goto err_free_status_req;
+                goto err_destroy_dma;
         }
         udc->irq = r->start;
-        if (request_irq(udc->irq, mv_udc_irq,
+        if (devm_request_irq(&pdev->dev, udc->irq, mv_udc_irq,
                 IRQF_SHARED, driver_name, udc)) {
-                dev_err(&dev->dev, "Request irq %d for UDC failed\n",
+                dev_err(&pdev->dev, "Request irq %d for UDC failed\n",
                         udc->irq);
                 retval = -ENODEV;
-                goto err_free_status_req;
+                goto err_destroy_dma;
         }
 
         /* initialize gadget structure */
@@ -2351,26 +2312,27 @@ static int mv_udc_probe(struct platform_device *dev)
 
         /* the "gadget" abstracts/virtualizes the controller */
         dev_set_name(&udc->gadget.dev, "gadget");
-        udc->gadget.dev.parent = &dev->dev;
-        udc->gadget.dev.dma_mask = dev->dev.dma_mask;
+        udc->gadget.dev.parent = &pdev->dev;
+        udc->gadget.dev.dma_mask = pdev->dev.dma_mask;
         udc->gadget.dev.release = gadget_release;
         udc->gadget.name = driver_name;         /* gadget name */
 
         retval = device_register(&udc->gadget.dev);
         if (retval)
-                goto err_free_irq;
+                goto err_destroy_dma;
 
         eps_init(udc);
 
         /* VBUS detect: we can disable/enable clock on demand.*/
-        if (!IS_ERR_OR_NULL(udc->transceiver))
+        if (udc->transceiver)
                 udc->clock_gating = 1;
         else if (pdata->vbus) {
                 udc->clock_gating = 1;
-                retval = request_threaded_irq(pdata->vbus->irq, NULL,
+                retval = devm_request_threaded_irq(&pdev->dev,
+                                pdata->vbus->irq, NULL,
                                 mv_udc_vbus_irq, IRQF_ONESHOT, "vbus", udc);
                 if (retval) {
-                        dev_info(&dev->dev,
+                        dev_info(&pdev->dev,
                                 "Can not request irq for VBUS, "
                                 "disable clock gating\n");
                         udc->clock_gating = 0;
@@ -2378,7 +2340,7 @@ static int mv_udc_probe(struct platform_device *dev)
 
                 udc->qwork = create_singlethread_workqueue("mv_udc_queue");
                 if (!udc->qwork) {
-                        dev_err(&dev->dev, "cannot create workqueue\n");
+                        dev_err(&pdev->dev, "cannot create workqueue\n");
                         retval = -ENOMEM;
                         goto err_unregister;
                 }
@@ -2396,53 +2358,40 @@ static int mv_udc_probe(struct platform_device *dev)
         else
                 udc->vbus_active = 1;
 
-        retval = usb_add_gadget_udc(&dev->dev, &udc->gadget);
+        retval = usb_add_gadget_udc(&pdev->dev, &udc->gadget);
         if (retval)
-                goto err_unregister;
+                goto err_create_workqueue;
 
-        dev_info(&dev->dev, "successful probe UDC device %s clock gating.\n",
+        platform_set_drvdata(pdev, udc);
+        dev_info(&pdev->dev, "successful probe UDC device %s clock gating.\n",
                 udc->clock_gating ? "with" : "without");
 
         return 0;
 
+err_create_workqueue:
+        destroy_workqueue(udc->qwork);
 err_unregister:
-        if (udc->pdata && udc->pdata->vbus
-                && udc->clock_gating && IS_ERR_OR_NULL(udc->transceiver))
-                free_irq(pdata->vbus->irq, &dev->dev);
         device_unregister(&udc->gadget.dev);
-err_free_irq:
-        free_irq(udc->irq, &dev->dev);
-err_free_status_req:
-        kfree(udc->status_req->req.buf);
-        kfree(udc->status_req);
-err_free_eps:
-        kfree(udc->eps);
 err_destroy_dma:
         dma_pool_destroy(udc->dtd_pool);
 err_free_dma:
-        dma_free_coherent(&dev->dev, udc->ep_dqh_size,
+        dma_free_coherent(&pdev->dev, udc->ep_dqh_size,
                         udc->ep_dqh, udc->ep_dqh_dma);
 err_disable_clock:
         mv_udc_disable_internal(udc);
-err_iounmap_phyreg:
-        iounmap(udc->phy_regs);
-err_iounmap_capreg:
-        iounmap(udc->cap_regs);
-err_put_clk:
-        for (clk_i--; clk_i >= 0; clk_i--)
-                clk_put(udc->clk[clk_i]);
-        the_controller = NULL;
-        kfree(udc);
+
         return retval;
 }
 
 #ifdef CONFIG_PM
-static int mv_udc_suspend(struct device *_dev)
+static int mv_udc_suspend(struct device *dev)
 {
-        struct mv_udc *udc = the_controller;
+        struct mv_udc *udc;
+
+        udc = dev_get_drvdata(dev);
 
         /* if OTG is enabled, the following will be done in OTG driver*/
-        if (!IS_ERR_OR_NULL(udc->transceiver))
+        if (udc->transceiver)
                 return 0;
 
         if (udc->pdata->vbus && udc->pdata->vbus->poll)
@@ -2469,13 +2418,15 @@ static int mv_udc_suspend(struct device *_dev)
         return 0;
 }
 
-static int mv_udc_resume(struct device *_dev)
+static int mv_udc_resume(struct device *dev)
 {
-        struct mv_udc *udc = the_controller;
+        struct mv_udc *udc;
         int retval;
 
+        udc = dev_get_drvdata(dev);
+
         /* if OTG is enabled, the following will be done in OTG driver*/
-        if (!IS_ERR_OR_NULL(udc->transceiver))
+        if (udc->transceiver)
                 return 0;
 
         if (!udc->clock_gating) {
@@ -2499,11 +2450,12 @@ static const struct dev_pm_ops mv_udc_pm_ops = {
 };
 #endif
 
-static void mv_udc_shutdown(struct platform_device *dev)
+static void mv_udc_shutdown(struct platform_device *pdev)
 {
-        struct mv_udc *udc = the_controller;
+        struct mv_udc *udc;
         u32 mode;
 
+        udc = platform_get_drvdata(pdev);
         /* reset controller mode to IDLE */
         mv_udc_enable(udc);
         mode = readl(&udc->op_regs->usbmode);
@@ -2514,7 +2466,7 @@ static void mv_udc_shutdown(struct platform_device *dev)
 
 static struct platform_driver udc_driver = {
         .probe          = mv_udc_probe,
-        .remove         = __exit_p(mv_udc_remove),
+        .remove         = mv_udc_remove,
         .shutdown       = mv_udc_shutdown,
         .driver         = {
                 .owner  = THIS_MODULE,
diff --git a/drivers/usb/gadget/nokia.c b/drivers/usb/gadget/nokia.c
index 661600abace8..def37403989a 100644
--- a/drivers/usb/gadget/nokia.c
+++ b/drivers/usb/gadget/nokia.c
@@ -37,7 +37,7 @@
  * the runtime footprint, and giving us at least some parts of what
  * a "gcc --combine ... part1.c part2.c part3.c ... " build would.
  */
-#include "u_serial.c"
+#define USB_FACM_INCLUDED
 #include "f_acm.c"
 #include "f_ecm.c"
 #include "f_obex.c"
@@ -101,6 +101,15 @@ MODULE_LICENSE("GPL");
 
 static u8 hostaddr[ETH_ALEN];
 
+enum {
+        TTY_PORT_OBEX0,
+        TTY_PORT_OBEX1,
+        TTY_PORT_ACM,
+        TTY_PORTS_MAX,
+};
+
+static unsigned char tty_lines[TTY_PORTS_MAX];
+
 static int __init nokia_bind_config(struct usb_configuration *c)
 {
         int status = 0;
@@ -109,15 +118,15 @@ static int __init nokia_bind_config(struct usb_configuration *c)
         if (status)
                 printk(KERN_DEBUG "could not bind phonet config\n");
 
-        status = obex_bind_config(c, 0);
+        status = obex_bind_config(c, tty_lines[TTY_PORT_OBEX0]);
         if (status)
                 printk(KERN_DEBUG "could not bind obex config %d\n", 0);
 
-        status = obex_bind_config(c, 1);
+        status = obex_bind_config(c, tty_lines[TTY_PORT_OBEX1]);
         if (status)
                 printk(KERN_DEBUG "could not bind obex config %d\n", 0);
 
-        status = acm_bind_config(c, 2);
+        status = acm_bind_config(c, tty_lines[TTY_PORT_ACM]);
         if (status)
                 printk(KERN_DEBUG "could not bind acm config\n");
 
@@ -133,7 +142,7 @@ static struct usb_configuration nokia_config_500ma_driver = {
         .bConfigurationValue = 1,
         /* .iConfiguration = DYNAMIC */
         .bmAttributes   = USB_CONFIG_ATT_ONE,
-        .bMaxPower      = 250, /* 500mA */
+        .MaxPower       = 500,
 };
 
 static struct usb_configuration nokia_config_100ma_driver = {
@@ -141,21 +150,24 @@ static struct usb_configuration nokia_config_100ma_driver = {
         .bConfigurationValue = 2,
         /* .iConfiguration = DYNAMIC */
         .bmAttributes   = USB_CONFIG_ATT_ONE | USB_CONFIG_ATT_SELFPOWER,
-        .bMaxPower      = 50, /* 100 mA */
+        .MaxPower       = 100,
 };
 
 static int __init nokia_bind(struct usb_composite_dev *cdev)
 {
         struct usb_gadget       *gadget = cdev->gadget;
         int                     status;
+        int                     cur_line;
 
         status = gphonet_setup(cdev->gadget);
         if (status < 0)
                 goto err_phonet;
 
-        status = gserial_setup(cdev->gadget, 3);
-        if (status < 0)
-                goto err_serial;
+        for (cur_line = 0; cur_line < TTY_PORTS_MAX; cur_line++) {
+                status = gserial_alloc_line(&tty_lines[cur_line]);
+                if (status)
+                        goto err_ether;
+        }
 
         status = gether_setup(cdev->gadget, hostaddr);
         if (status < 0)
@@ -192,8 +204,10 @@ static int __init nokia_bind(struct usb_composite_dev *cdev)
 err_usb:
         gether_cleanup();
 err_ether:
-        gserial_cleanup();
-err_serial:
+        cur_line--;
+        while (cur_line >= 0)
+                gserial_free_line(tty_lines[cur_line--]);
+
         gphonet_cleanup();
 err_phonet:
         return status;
@@ -201,8 +215,13 @@ err_phonet:
 
 static int __exit nokia_unbind(struct usb_composite_dev *cdev)
 {
+        int i;
+
         gphonet_cleanup();
-        gserial_cleanup();
+
+        for (i = 0; i < TTY_PORTS_MAX; i++)
+                gserial_free_line(tty_lines[i]);
+
         gether_cleanup();
 
         return 0;
diff --git a/drivers/usb/gadget/omap_udc.c b/drivers/usb/gadget/omap_udc.c
index 8bfe990caf1a..06be85c2b233 100644
--- a/drivers/usb/gadget/omap_udc.c
+++ b/drivers/usb/gadget/omap_udc.c
@@ -1309,19 +1309,20 @@ static int omap_pullup(struct usb_gadget *gadget, int is_on)
         return 0;
 }
 
-static int omap_udc_start(struct usb_gadget_driver *driver,
-                int (*bind)(struct usb_gadget *, struct usb_gadget_driver *));
-static int omap_udc_stop(struct usb_gadget_driver *driver);
+static int omap_udc_start(struct usb_gadget *g,
+                struct usb_gadget_driver *driver)
+static int omap_udc_stop(struct usb_gadget *g,
+                struct usb_gadget_driver *driver);
 
-static struct usb_gadget_ops omap_gadget_ops = {
+static const struct usb_gadget_ops omap_gadget_ops = {
         .get_frame              = omap_get_frame,
         .wakeup                 = omap_wakeup,
         .set_selfpowered        = omap_set_selfpowered,
         .vbus_session           = omap_vbus_session,
         .vbus_draw              = omap_vbus_draw,
         .pullup                 = omap_pullup,
-        .start                  = omap_udc_start,
-        .stop                   = omap_udc_stop,
+        .udc_start              = omap_udc_start,
+        .udc_stop               = omap_udc_stop,
 };
 
 /*-------------------------------------------------------------------------*/
@@ -2041,28 +2042,15 @@ static inline int machine_without_vbus_sense(void)
                 || cpu_is_omap7xx();
 }
 
-static int omap_udc_start(struct usb_gadget_driver *driver,
-                int (*bind)(struct usb_gadget *, struct usb_gadget_driver *))
+static int omap_udc_start(struct usb_gadget *g,
+                struct usb_gadget_driver *driver)
 {
         int             status = -ENODEV;
         struct omap_ep  *ep;
         unsigned long   flags;
 
-        /* basic sanity tests */
-        if (!udc)
-                return -ENODEV;
-        if (!driver
-                        /* FIXME if otg, check:  driver->is_otg */
-                        || driver->max_speed < USB_SPEED_FULL
-                        || !bind || !driver->setup)
-                return -EINVAL;
 
         spin_lock_irqsave(&udc->lock, flags);
-        if (udc->driver) {
-                spin_unlock_irqrestore(&udc->lock, flags);
-                return -EBUSY;
-        }
-
         /* reset state */
         list_for_each_entry(ep, &udc->gadget.ep_list, ep.ep_list) {
                 ep->irqs = 0;
@@ -2084,15 +2072,6 @@ static int omap_udc_start(struct usb_gadget_driver *driver,
         if (udc->dc_clk != NULL)
                 omap_udc_enable_clock(1);
 
-        status = bind(&udc->gadget, driver);
-        if (status) {
-                DBG("bind to %s --> %d\n", driver->driver.name, status);
-                udc->gadget.dev.driver = NULL;
-                udc->driver = NULL;
-                goto done;
-        }
-        DBG("bound to driver %s\n", driver->driver.name);
-
         omap_writew(UDC_IRQ_SRC_MASK, UDC_IRQ_SRC);
 
         /* connect to bus through transceiver */
@@ -2124,19 +2103,16 @@ static int omap_udc_start(struct usb_gadget_driver *driver,
 done:
         if (udc->dc_clk != NULL)
                 omap_udc_enable_clock(0);
+
         return status;
 }
 
-static int omap_udc_stop(struct usb_gadget_driver *driver)
+static int omap_udc_stop(struct usb_gadget *g,
+                struct usb_gadget_driver *driver)
 {
         unsigned long   flags;
         int             status = -ENODEV;
 
-        if (!udc)
-                return -ENODEV;
-        if (!driver || driver != udc->driver || !driver->unbind)
-                return -EINVAL;
-
         if (udc->dc_clk != NULL)
                 omap_udc_enable_clock(1);
 
@@ -2152,13 +2128,12 @@ static int omap_udc_stop(struct usb_gadget_driver *driver)
         udc_quiesce(udc);
         spin_unlock_irqrestore(&udc->lock, flags);
 
-        driver->unbind(&udc->gadget);
         udc->gadget.dev.driver = NULL;
         udc->driver = NULL;
 
         if (udc->dc_clk != NULL)
                 omap_udc_enable_clock(0);
-        DBG("unregistered driver '%s'\n", driver->driver.name);
+
         return status;
 }
 
diff --git a/drivers/usb/gadget/pch_udc.c b/drivers/usb/gadget/pch_udc.c
index 6490c0040e3a..a787a8ef672b 100644
--- a/drivers/usb/gadget/pch_udc.c
+++ b/drivers/usb/gadget/pch_udc.c
@@ -375,6 +375,7 @@ struct pch_udc_dev {
         struct pch_udc_cfg_data         cfg_data;
         struct pch_vbus_gpio_data       vbus_gpio;
 };
+#define to_pch_udc(g)   (container_of((g), struct pch_udc_dev, gadget))
 
 #define PCH_UDC_PCI_BAR                 1
 #define PCI_DEVICE_ID_INTEL_EG20T_UDC   0x8808
@@ -384,7 +385,6 @@ struct pch_udc_dev {
 
 static const char       ep0_string[] = "ep0in";
 static DEFINE_SPINLOCK(udc_stall_spinlock);     /* stall spin lock */
-struct pch_udc_dev *pch_udc;            /* pointer to device object */
 static bool speed_fs;
 module_param_named(speed_fs, speed_fs, bool, S_IRUGO);
 MODULE_PARM_DESC(speed_fs, "true for Full speed operation");
@@ -1235,9 +1235,10 @@ static int pch_udc_pcd_vbus_draw(struct usb_gadget *gadget, unsigned int mA)
         return -EOPNOTSUPP;
 }
 
-static int pch_udc_start(struct usb_gadget_driver *driver,
-        int (*bind)(struct usb_gadget *, struct usb_gadget_driver *));
-static int pch_udc_stop(struct usb_gadget_driver *driver);
+static int pch_udc_start(struct usb_gadget *g,
+                struct usb_gadget_driver *driver);
+static int pch_udc_stop(struct usb_gadget *g,
+                struct usb_gadget_driver *driver);
 static const struct usb_gadget_ops pch_udc_ops = {
         .get_frame = pch_udc_pcd_get_frame,
         .wakeup = pch_udc_pcd_wakeup,
@@ -1245,8 +1246,8 @@ static const struct usb_gadget_ops pch_udc_ops = {
         .pullup = pch_udc_pcd_pullup,
         .vbus_session = pch_udc_pcd_vbus_session,
         .vbus_draw = pch_udc_pcd_vbus_draw,
-        .start  = pch_udc_start,
-        .stop   = pch_udc_stop,
+        .udc_start = pch_udc_start,
+        .udc_stop = pch_udc_stop,
 };
 
 /**
@@ -2981,40 +2982,15 @@ static int init_dma_pools(struct pch_udc_dev *dev)
         return 0;
 }
 
-static int pch_udc_start(struct usb_gadget_driver *driver,
-        int (*bind)(struct usb_gadget *, struct usb_gadget_driver *))
+static int pch_udc_start(struct usb_gadget *g,
+                struct usb_gadget_driver *driver)
 {
-        struct pch_udc_dev      *dev = pch_udc;
-        int                     retval;
-
-        if (!driver || (driver->max_speed == USB_SPEED_UNKNOWN) || !bind ||
-            !driver->setup || !driver->unbind || !driver->disconnect) {
-                dev_err(&dev->pdev->dev,
-                        "%s: invalid driver parameter\n", __func__);
-                return -EINVAL;
-        }
+        struct pch_udc_dev      *dev = to_pch_udc(g);
 
-        if (!dev)
-                return -ENODEV;
-
-        if (dev->driver) {
-                dev_err(&dev->pdev->dev, "%s: already bound\n", __func__);
-                return -EBUSY;
-        }
         driver->driver.bus = NULL;
         dev->driver = driver;
         dev->gadget.dev.driver = &driver->driver;
 
-        /* Invoke the bind routine of the gadget driver */
-        retval = bind(&dev->gadget, driver);
-
-        if (retval) {
-                dev_err(&dev->pdev->dev, "%s: binding to %s returning %d\n",
-                       __func__, driver->driver.name, retval);
-                dev->driver = NULL;
-                dev->gadget.dev.driver = NULL;
-                return retval;
-        }
         /* get ready for ep0 traffic */
         pch_udc_setup_ep0(dev);
 
@@ -3026,30 +3002,21 @@ static int pch_udc_start(struct usb_gadget_driver *driver,
         return 0;
 }
 
-static int pch_udc_stop(struct usb_gadget_driver *driver)
+static int pch_udc_stop(struct usb_gadget *g,
+                struct usb_gadget_driver *driver)
 {
-        struct pch_udc_dev      *dev = pch_udc;
-
-        if (!dev)
-                return -ENODEV;
-
-        if (!driver || (driver != dev->driver)) {
-                dev_err(&dev->pdev->dev,
-                        "%s: invalid driver parameter\n", __func__);
-                return -EINVAL;
-        }
+        struct pch_udc_dev      *dev = to_pch_udc(g);
 
         pch_udc_disable_interrupts(dev, UDC_DEVINT_MSK);
 
         /* Assures that there are no pending requests with this driver */
-        driver->disconnect(&dev->gadget);
-        driver->unbind(&dev->gadget);
         dev->gadget.dev.driver = NULL;
         dev->driver = NULL;
         dev->connected = 0;
 
         /* set SD */
         pch_udc_set_disconnect(dev);
+
         return 0;
 }
 
@@ -3164,11 +3131,6 @@ static int pch_udc_probe(struct pci_dev *pdev,
         int                     retval;
         struct pch_udc_dev      *dev;
 
-        /* one udc only */
-        if (pch_udc) {
-                pr_err("%s: already probed\n", __func__);
-                return -EBUSY;
-        }
         /* init */
         dev = kzalloc(sizeof *dev, GFP_KERNEL);
         if (!dev) {
@@ -3207,7 +3169,6 @@ static int pch_udc_probe(struct pci_dev *pdev,
                 retval = -ENODEV;
                 goto finished;
         }
-        pch_udc = dev;
         /* initialize the hardware */
         if (pch_udc_pcd_init(dev)) {
                 retval = -ENODEV;
diff --git a/drivers/usb/gadget/pxa25x_udc.c b/drivers/usb/gadget/pxa25x_udc.c
index d4ca9f1f7f24..fa9c34469a82 100644
--- a/drivers/usb/gadget/pxa25x_udc.c
+++ b/drivers/usb/gadget/pxa25x_udc.c
@@ -996,9 +996,10 @@ static int pxa25x_udc_vbus_draw(struct usb_gadget *_gadget, unsigned mA)
         return -EOPNOTSUPP;
 }
 
-static int pxa25x_start(struct usb_gadget_driver *driver,
-                int (*bind)(struct usb_gadget *, struct usb_gadget_driver *));
-static int pxa25x_stop(struct usb_gadget_driver *driver);
+static int pxa25x_udc_start(struct usb_gadget *g,
+                struct usb_gadget_driver *driver);
+static int pxa25x_udc_stop(struct usb_gadget *g,
+                struct usb_gadget_driver *driver);
 
 static const struct usb_gadget_ops pxa25x_udc_ops = {
         .get_frame      = pxa25x_udc_get_frame,
@@ -1006,8 +1007,8 @@ static const struct usb_gadget_ops pxa25x_udc_ops = {
         .vbus_session   = pxa25x_udc_vbus_session,
         .pullup         = pxa25x_udc_pullup,
         .vbus_draw      = pxa25x_udc_vbus_draw,
-        .start          = pxa25x_start,
-        .stop           = pxa25x_stop,
+        .udc_start      = pxa25x_udc_start,
+        .udc_stop       = pxa25x_udc_stop,
 };
 
 /*-------------------------------------------------------------------------*/
@@ -1254,23 +1255,12 @@ static void udc_enable (struct pxa25x_udc *dev)
  * disconnect is reported.  then a host may connect again, or
  * the driver might get unbound.
  */
-static int pxa25x_start(struct usb_gadget_driver *driver,
-                int (*bind)(struct usb_gadget *, struct usb_gadget_driver *))
+static int pxa25x_udc_start(struct usb_gadget *g,
+                struct usb_gadget_driver *driver)
 {
-        struct pxa25x_udc       *dev = the_controller;
+        struct pxa25x_udc       *dev = to_pxa25x(g);
         int                     retval;
 
-        if (!driver
-                        || driver->max_speed < USB_SPEED_FULL
-                        || !bind
-                        || !driver->disconnect
-                        || !driver->setup)
-                return -EINVAL;
-        if (!dev)
-                return -ENODEV;
-        if (dev->driver)
-                return -EBUSY;
-
         /* first hook up the driver ... */
         dev->driver = driver;
         dev->gadget.dev.driver = &driver->driver;
@@ -1278,34 +1268,20 @@ static int pxa25x_start(struct usb_gadget_driver *driver,
 
         retval = device_add (&dev->gadget.dev);
         if (retval) {
-fail:
                 dev->driver = NULL;
                 dev->gadget.dev.driver = NULL;
                 return retval;
         }
-        retval = bind(&dev->gadget, driver);
-        if (retval) {
-                DMSG("bind to driver %s --> error %d\n",
-                                driver->driver.name, retval);
-                device_del (&dev->gadget.dev);
-                goto fail;
-        }
 
         /* ... then enable host detection and ep0; and we're ready
          * for set_configuration as well as eventual disconnect.
          */
-        DMSG("registered gadget driver '%s'\n", driver->driver.name);
-
         /* connect to bus through transceiver */
         if (!IS_ERR_OR_NULL(dev->transceiver)) {
                 retval = otg_set_peripheral(dev->transceiver->otg,
                                                 &dev->gadget);
-                if (retval) {
-                        DMSG("can't bind to transceiver\n");
-                        if (driver->unbind)
-                                driver->unbind(&dev->gadget);
+                if (retval)
                         goto bind_fail;
-                }
         }
 
         pullup(dev);
@@ -1334,22 +1310,14 @@ stop_activity(struct pxa25x_udc *dev, struct usb_gadget_driver *driver)
         }
         del_timer_sync(&dev->timer);
 
-        /* report disconnect; the driver is already quiesced */
-        if (driver)
-                driver->disconnect(&dev->gadget);
-
         /* re-init driver-visible data structures */
         udc_reinit(dev);
 }
 
-static int pxa25x_stop(struct usb_gadget_driver *driver)
+static int pxa25x_udc_stop(struct usb_gadget*g,
+                struct usb_gadget_driver *driver)
 {
-        struct pxa25x_udc       *dev = the_controller;
-
-        if (!dev)
-                return -ENODEV;
-        if (!driver || driver != dev->driver || !driver->unbind)
-                return -EINVAL;
+        struct pxa25x_udc       *dev = to_pxa25x(g);
 
         local_irq_disable();
         dev->pullup = 0;
@@ -1360,14 +1328,12 @@ static int pxa25x_stop(struct usb_gadget_driver *driver)
         if (!IS_ERR_OR_NULL(dev->transceiver))
                 (void) otg_set_peripheral(dev->transceiver->otg, NULL);
 
-        driver->unbind(&dev->gadget);
         dev->gadget.dev.driver = NULL;
         dev->driver = NULL;
 
         device_del (&dev->gadget.dev);
-
-        DMSG("unregistered gadget driver '%s'\n", driver->driver.name);
         dump_state(dev);
+
         return 0;
 }
 
diff --git a/drivers/usb/gadget/pxa25x_udc.h b/drivers/usb/gadget/pxa25x_udc.h
index 2eca1e71fecd..3fe5931dc21a 100644
--- a/drivers/usb/gadget/pxa25x_udc.h
+++ b/drivers/usb/gadget/pxa25x_udc.h
@@ -126,6 +126,7 @@ struct pxa25x_udc {
         struct dentry                           *debugfs_udc;
 #endif
 };
+#define to_pxa25x(g)    (container_of((g), struct pxa25x_udc, gadget))
 
 /*-------------------------------------------------------------------------*/
 
diff --git a/drivers/usb/gadget/pxa27x_udc.c b/drivers/usb/gadget/pxa27x_udc.c
index 2b3b01d5f403..f7d25795821a 100644
--- a/drivers/usb/gadget/pxa27x_udc.c
+++ b/drivers/usb/gadget/pxa27x_udc.c
@@ -1671,9 +1671,10 @@ static int pxa_udc_vbus_draw(struct usb_gadget *_gadget, unsigned mA)
         return -EOPNOTSUPP;
 }
 
-static int pxa27x_udc_start(struct usb_gadget_driver *driver,
-                int (*bind)(struct usb_gadget *, struct usb_gadget_driver *));
-static int pxa27x_udc_stop(struct usb_gadget_driver *driver);
+static int pxa27x_udc_start(struct usb_gadget *g,
+                struct usb_gadget_driver *driver);
+static int pxa27x_udc_stop(struct usb_gadget *g,
+                struct usb_gadget_driver *driver);
 
 static const struct usb_gadget_ops pxa_udc_ops = {
         .get_frame      = pxa_udc_get_frame,
@@ -1681,8 +1682,8 @@ static const struct usb_gadget_ops pxa_udc_ops = {
         .pullup         = pxa_udc_pullup,
         .vbus_session   = pxa_udc_vbus_session,
         .vbus_draw      = pxa_udc_vbus_draw,
-        .start          = pxa27x_udc_start,
-        .stop           = pxa27x_udc_stop,
+        .udc_start      = pxa27x_udc_start,
+        .udc_stop       = pxa27x_udc_stop,
 };
 
 /**
@@ -1802,20 +1803,12 @@ static void udc_enable(struct pxa_udc *udc)
  *
  * Returns 0 if no error, -EINVAL, -ENODEV, -EBUSY otherwise
  */
-static int pxa27x_udc_start(struct usb_gadget_driver *driver,
-                int (*bind)(struct usb_gadget *, struct usb_gadget_driver *))
+static int pxa27x_udc_start(struct usb_gadget *g,
+                struct usb_gadget_driver *driver)
 {
-        struct pxa_udc *udc = the_controller;
+        struct pxa_udc *udc = to_pxa(g);
         int retval;
 
-        if (!driver || driver->max_speed < USB_SPEED_FULL || !bind
-                        || !driver->disconnect || !driver->setup)
-                return -EINVAL;
-        if (!udc)
-                return -ENODEV;
-        if (udc->driver)
-                return -EBUSY;
-
         /* first hook up the driver ... */
         udc->driver = driver;
         udc->gadget.dev.driver = &driver->driver;
@@ -1824,23 +1817,14 @@ static int pxa27x_udc_start(struct usb_gadget_driver *driver,
         retval = device_add(&udc->gadget.dev);
         if (retval) {
                 dev_err(udc->dev, "device_add error %d\n", retval);
-                goto add_fail;
+                goto fail;
         }
-        retval = bind(&udc->gadget, driver);
-        if (retval) {
-                dev_err(udc->dev, "bind to driver %s --> error %d\n",
-                        driver->driver.name, retval);
-                goto bind_fail;
-        }
-        dev_dbg(udc->dev, "registered gadget driver '%s'\n",
-                driver->driver.name);
-
         if (!IS_ERR_OR_NULL(udc->transceiver)) {
                 retval = otg_set_peripheral(udc->transceiver->otg,
                                                 &udc->gadget);
                 if (retval) {
                         dev_err(udc->dev, "can't bind to transceiver\n");
-                        goto transceiver_fail;
+                        goto fail;
                 }
         }
 
@@ -1848,12 +1832,7 @@ static int pxa27x_udc_start(struct usb_gadget_driver *driver,
                 udc_enable(udc);
         return 0;
 
-transceiver_fail:
-        if (driver->unbind)
-                driver->unbind(&udc->gadget);
-bind_fail:
-        device_del(&udc->gadget.dev);
-add_fail:
+fail:
         udc->driver = NULL;
         udc->gadget.dev.driver = NULL;
         return retval;
@@ -1878,9 +1857,6 @@ static void stop_activity(struct pxa_udc *udc, struct usb_gadget_driver *driver)
 
         for (i = 0; i < NR_USB_ENDPOINTS; i++)
                 pxa_ep_disable(&udc->udc_usb_ep[i].usb_ep);
-
-        if (driver)
-                driver->disconnect(&udc->gadget);
 }
 
 /**
@@ -1889,25 +1865,18 @@ static void stop_activity(struct pxa_udc *udc, struct usb_gadget_driver *driver)
  *
  * Returns 0 if no error, -ENODEV, -EINVAL otherwise
  */
-static int pxa27x_udc_stop(struct usb_gadget_driver *driver)
+static int pxa27x_udc_stop(struct usb_gadget *g,
+                struct usb_gadget_driver *driver)
 {
-        struct pxa_udc *udc = the_controller;
-
-        if (!udc)
-                return -ENODEV;
-        if (!driver || driver != udc->driver || !driver->unbind)
-                return -EINVAL;
+        struct pxa_udc *udc = to_pxa(g);
 
         stop_activity(udc, driver);
         udc_disable(udc);
         dplus_pullup(udc, 0);
 
-        driver->unbind(&udc->gadget);
         udc->driver = NULL;
 
         device_del(&udc->gadget.dev);
-        dev_info(udc->dev, "unregistered gadget driver '%s'\n",
-                 driver->driver.name);
 
         if (!IS_ERR_OR_NULL(udc->transceiver))
                 return otg_set_peripheral(udc->transceiver->otg, NULL);
diff --git a/drivers/usb/gadget/pxa27x_udc.h b/drivers/usb/gadget/pxa27x_udc.h
index 79d81a4b2344..28f2b53530f5 100644
--- a/drivers/usb/gadget/pxa27x_udc.h
+++ b/drivers/usb/gadget/pxa27x_udc.h
@@ -473,6 +473,7 @@ struct pxa_udc {
         struct dentry                           *debugfs_eps;
 #endif
 };
+#define to_pxa(g)       (container_of((g), struct pxa_udc, gadget))
 
 static inline struct pxa_udc *to_gadget_udc(struct usb_gadget *gadget)
 {
diff --git a/drivers/usb/gadget/r8a66597-udc.c b/drivers/usb/gadget/r8a66597-udc.c
index 5a80751accb7..234838da6d51 100644
--- a/drivers/usb/gadget/r8a66597-udc.c
+++ b/drivers/usb/gadget/r8a66597-udc.c
@@ -1812,7 +1812,7 @@ static int r8a66597_set_selfpowered(struct usb_gadget *gadget, int is_self)
         return 0;
 }
 
-static struct usb_gadget_ops r8a66597_gadget_ops = {
+static const struct usb_gadget_ops r8a66597_gadget_ops = {
         .get_frame              = r8a66597_get_frame,
         .udc_start              = r8a66597_start,
         .udc_stop               = r8a66597_stop,
diff --git a/drivers/usb/gadget/s3c-hsotg.c b/drivers/usb/gadget/s3c-hsotg.c
index 439c3f972f8c..e1cd0f1adfb9 100644
--- a/drivers/usb/gadget/s3c-hsotg.c
+++ b/drivers/usb/gadget/s3c-hsotg.c
@@ -3055,7 +3055,7 @@ static int s3c_hsotg_pullup(struct usb_gadget *gadget, int is_on)
         return 0;
 }
 
-static struct usb_gadget_ops s3c_hsotg_gadget_ops = {
+static const struct usb_gadget_ops s3c_hsotg_gadget_ops = {
         .get_frame      = s3c_hsotg_gadget_getframe,
         .udc_start              = s3c_hsotg_udc_start,
         .udc_stop               = s3c_hsotg_udc_stop,
@@ -3572,7 +3572,7 @@ static int s3c_hsotg_probe(struct platform_device *pdev)
         for (i = 0; i < ARRAY_SIZE(hsotg->supplies); i++)
                 hsotg->supplies[i].supply = s3c_hsotg_supply_names[i];
 
-        ret = regulator_bulk_get(dev, ARRAY_SIZE(hsotg->supplies),
+        ret = devm_regulator_bulk_get(dev, ARRAY_SIZE(hsotg->supplies),
                                  hsotg->supplies);
         if (ret) {
                 dev_err(dev, "failed to request supplies: %d\n", ret);
@@ -3662,8 +3662,6 @@ err_ep_mem:
         kfree(eps);
 err_supplies:
         s3c_hsotg_phy_disable(hsotg);
-        regulator_bulk_free(ARRAY_SIZE(hsotg->supplies), hsotg->supplies);
-
 err_clk:
         clk_disable_unprepare(hsotg->clk);
 
@@ -3688,7 +3686,6 @@ static int s3c_hsotg_remove(struct platform_device *pdev)
         }
 
         s3c_hsotg_phy_disable(hsotg);
-        regulator_bulk_free(ARRAY_SIZE(hsotg->supplies), hsotg->supplies);
 
         clk_disable_unprepare(hsotg->clk);
 
diff --git a/drivers/usb/gadget/s3c-hsudc.c b/drivers/usb/gadget/s3c-hsudc.c
index 52379b11f080..3ed5a397296f 100644
--- a/drivers/usb/gadget/s3c-hsudc.c
+++ b/drivers/usb/gadget/s3c-hsudc.c
@@ -435,7 +435,7 @@ static void s3c_hsudc_epin_intr(struct s3c_hsudc *hsudc, u32 ep_idx)
         struct s3c_hsudc_req *hsreq;
         u32 csr;
 
-        csr = readl((u32)hsudc->regs + S3C_ESR);
+        csr = readl(hsudc->regs + S3C_ESR);
         if (csr & S3C_ESR_STALL) {
                 writel(S3C_ESR_STALL, hsudc->regs + S3C_ESR);
                 return;
@@ -468,7 +468,7 @@ static void s3c_hsudc_epout_intr(struct s3c_hsudc *hsudc, u32 ep_idx)
         struct s3c_hsudc_req *hsreq;
         u32 csr;
 
-        csr = readl((u32)hsudc->regs + S3C_ESR);
+        csr = readl(hsudc->regs + S3C_ESR);
         if (csr & S3C_ESR_STALL) {
                 writel(S3C_ESR_STALL, hsudc->regs + S3C_ESR);
                 return;
@@ -901,12 +901,12 @@ static int s3c_hsudc_queue(struct usb_ep *_ep, struct usb_request *_req,
         if (list_empty(&hsep->queue) && !hsep->stopped) {
                 offset = (ep_index(hsep)) ? S3C_ESR : S3C_EP0SR;
                 if (ep_is_in(hsep)) {
-                        csr = readl((u32)hsudc->regs + offset);
+                        csr = readl(hsudc->regs + offset);
                         if (!(csr & S3C_ESR_TX_SUCCESS) &&
                                 (s3c_hsudc_write_fifo(hsep, hsreq) == 1))
                                 hsreq = NULL;
                 } else {
-                        csr = readl((u32)hsudc->regs + offset);
+                        csr = readl(hsudc->regs + offset);
                         if ((csr & S3C_ESR_RX_SUCCESS)
                                    && (s3c_hsudc_read_fifo(hsep, hsreq) == 1))
                                 hsreq = NULL;
@@ -1254,7 +1254,7 @@ static int s3c_hsudc_vbus_draw(struct usb_gadget *gadget, unsigned mA)
         return -EOPNOTSUPP;
 }
 
-static struct usb_gadget_ops s3c_hsudc_gadget_ops = {
+static const struct usb_gadget_ops s3c_hsudc_gadget_ops = {
         .get_frame      = s3c_hsudc_gadget_getframe,
         .udc_start      = s3c_hsudc_start,
         .udc_stop       = s3c_hsudc_stop,
@@ -1286,7 +1286,7 @@ static int s3c_hsudc_probe(struct platform_device *pdev)
         for (i = 0; i < ARRAY_SIZE(hsudc->supplies); i++)
                 hsudc->supplies[i].supply = s3c_hsudc_supply_names[i];
 
-        ret = regulator_bulk_get(dev, ARRAY_SIZE(hsudc->supplies),
+        ret = devm_regulator_bulk_get(dev, ARRAY_SIZE(hsudc->supplies),
                                  hsudc->supplies);
         if (ret != 0) {
                 dev_err(dev, "failed to request supplies: %d\n", ret);
@@ -1367,7 +1367,6 @@ err_res:
         if (!IS_ERR_OR_NULL(hsudc->transceiver))
                 usb_put_phy(hsudc->transceiver);
 
-        regulator_bulk_free(ARRAY_SIZE(hsudc->supplies), hsudc->supplies);
 err_supplies:
         return ret;
 }
diff --git a/drivers/usb/gadget/s3c2410_udc.c b/drivers/usb/gadget/s3c2410_udc.c
index a2fa6e16d019..fc07b4381286 100644
--- a/drivers/usb/gadget/s3c2410_udc.c
+++ b/drivers/usb/gadget/s3c2410_udc.c
@@ -1538,9 +1538,10 @@ static int s3c2410_vbus_draw(struct usb_gadget *_gadget, unsigned ma)
         return -ENOTSUPP;
 }
 
-static int s3c2410_udc_start(struct usb_gadget_driver *driver,
-                int (*bind)(struct usb_gadget *, struct usb_gadget_driver *));
-static int s3c2410_udc_stop(struct usb_gadget_driver *driver);
+static int s3c2410_udc_start(struct usb_gadget *g,
+                struct usb_gadget_driver *driver);
+static int s3c2410_udc_stop(struct usb_gadget *g,
+                struct usb_gadget_driver *driver);
 
 static const struct usb_gadget_ops s3c2410_ops = {
         .get_frame              = s3c2410_udc_get_frame,
@@ -1549,8 +1550,8 @@ static const struct usb_gadget_ops s3c2410_ops = {
         .pullup                 = s3c2410_udc_pullup,
         .vbus_session           = s3c2410_udc_vbus_session,
         .vbus_draw              = s3c2410_vbus_draw,
-        .start                  = s3c2410_udc_start,
-        .stop                   = s3c2410_udc_stop,
+        .udc_start              = s3c2410_udc_start,
+        .udc_stop               = s3c2410_udc_stop,
 };
 
 static void s3c2410_udc_command(enum s3c2410_udc_cmd_e cmd)
@@ -1664,33 +1665,14 @@ static void s3c2410_udc_enable(struct s3c2410_udc *dev)
         s3c2410_udc_command(S3C2410_UDC_P_ENABLE);
 }
 
-static int s3c2410_udc_start(struct usb_gadget_driver *driver,
-                int (*bind)(struct usb_gadget *, struct usb_gadget_driver *))
+static int s3c2410_udc_start(struct usb_gadget *g,
+                struct usb_gadget_driver *driver)
 {
-        struct s3c2410_udc *udc = the_controller;
+        struct s3c2410_udc *udc = to_s3c2410(g)
         int             retval;
 
         dprintk(DEBUG_NORMAL, "%s() '%s'\n", __func__, driver->driver.name);
 
-        /* Sanity checks */
-        if (!udc)
-                return -ENODEV;
-
-        if (udc->driver)
-                return -EBUSY;
-
-        if (!bind || !driver->setup || driver->max_speed < USB_SPEED_FULL) {
-                dev_err(&udc->gadget.dev, "Invalid driver: bind %p setup %p speed %d\n",
-                        bind, driver->setup, driver->max_speed);
-                return -EINVAL;
-        }
-#if defined(MODULE)
-        if (!driver->unbind) {
-                dev_err(&udc->gadget.dev, "Invalid driver: no unbind method\n");
-                return -EINVAL;
-        }
-#endif
-
         /* Hook the driver */
         udc->driver = driver;
         udc->gadget.dev.driver = &driver->driver;
@@ -1702,15 +1684,6 @@ static int s3c2410_udc_start(struct usb_gadget_driver *driver,
                 goto register_error;
         }
 
-        dprintk(DEBUG_NORMAL, "binding gadget driver '%s'\n",
-                driver->driver.name);
-
-        retval = bind(&udc->gadget, driver);
-        if (retval) {
-                device_del(&udc->gadget.dev);
-                goto register_error;
-        }
-
         /* Enable udc */
         s3c2410_udc_enable(udc);
 
@@ -1722,24 +1695,10 @@ register_error:
         return retval;
 }
 
-static int s3c2410_udc_stop(struct usb_gadget_driver *driver)
+static int s3c2410_udc_stop(struct usb_gadget *g,
+                struct usb_gadget_driver *driver)
 {
-        struct s3c2410_udc *udc = the_controller;
-
-        if (!udc)
-                return -ENODEV;
-
-        if (!driver || driver != udc->driver || !driver->unbind)
-                return -EINVAL;
-
-        dprintk(DEBUG_NORMAL, "usb_gadget_unregister_driver() '%s'\n",
-                driver->driver.name);
-
-        /* report disconnect */
-        if (driver->disconnect)
-                driver->disconnect(&udc->gadget);
-
-        driver->unbind(&udc->gadget);
+        struct s3c2410_udc *udc = to_s3c2410(g);
 
         device_del(&udc->gadget.dev);
         udc->driver = NULL;
diff --git a/drivers/usb/gadget/s3c2410_udc.h b/drivers/usb/gadget/s3c2410_udc.h
index 3e80fd5c820f..93bf225f1969 100644
--- a/drivers/usb/gadget/s3c2410_udc.h
+++ b/drivers/usb/gadget/s3c2410_udc.h
@@ -95,5 +95,6 @@ struct s3c2410_udc {
         u8                              vbus;
         struct dentry                   *regs_info;
 };
+#define to_s3c2410(g)   (container_of((g), struct s3c2410_udc, gadget))
 
 #endif
diff --git a/drivers/usb/gadget/serial.c b/drivers/usb/gadget/serial.c
index 44752f531e85..68d7bb06ebcb 100644
--- a/drivers/usb/gadget/serial.c
+++ b/drivers/usb/gadget/serial.c
@@ -36,10 +36,8 @@
  * the runtime footprint, and giving us at least some parts of what
  * a "gcc --combine ... part1.c part2.c part3.c ... " build would.
  */
-#include "f_acm.c"
 #include "f_obex.c"
 #include "f_serial.c"
-#include "u_serial.c"
 
 /*-------------------------------------------------------------------------*/
 USB_GADGET_COMPOSITE_OPTIONS();
@@ -128,20 +126,25 @@ module_param(n_ports, uint, 0);
 MODULE_PARM_DESC(n_ports, "number of ports to create, default=1");
 
 /*-------------------------------------------------------------------------*/
+static unsigned char tty_lines[MAX_U_SERIAL_PORTS];
 
-static int __init serial_bind_config(struct usb_configuration *c)
+static int __init serial_bind_obex_config(struct usb_configuration *c)
 {
         unsigned i;
         int status = 0;
 
-        for (i = 0; i < n_ports && status == 0; i++) {
-                if (use_acm)
-                        status = acm_bind_config(c, i);
-                else if (use_obex)
-                        status = obex_bind_config(c, i);
-                else
-                        status = gser_bind_config(c, i);
-        }
+        for (i = 0; i < n_ports && status == 0; i++)
+                status = obex_bind_config(c, tty_lines[i]);
+        return status;
+}
+
+static int __init serial_bind_gser_config(struct usb_configuration *c)
+{
+        unsigned i;
+        int status = 0;
+
+        for (i = 0; i < n_ports && status == 0; i++)
+                status = gser_bind_config(c, tty_lines[i]);
         return status;
 }
 
@@ -152,13 +155,70 @@ static struct usb_configuration serial_config_driver = {
         .bmAttributes   = USB_CONFIG_ATT_SELFPOWER,
 };
 
+static struct usb_function_instance *fi_serial[MAX_U_SERIAL_PORTS];
+static struct usb_function *f_serial[MAX_U_SERIAL_PORTS];
+
+static int serial_register_ports(struct usb_composite_dev *cdev,
+                struct usb_configuration *c, const char *f_name)
+{
+        int i;
+        int ret;
+
+        ret = usb_add_config_only(cdev, c);
+        if (ret)
+                goto out;
+
+        for (i = 0; i < n_ports; i++) {
+                struct f_serial_opts *opts;
+
+                fi_serial[i] = usb_get_function_instance(f_name);
+                if (IS_ERR(fi_serial[i])) {
+                        ret = PTR_ERR(fi_serial[i]);
+                        goto fail;
+                }
+                opts = container_of(fi_serial[i], struct f_serial_opts, func_inst);
+                opts->port_num = tty_lines[i];
+
+                f_serial[i] = usb_get_function(fi_serial[i]);
+                if (IS_ERR(f_serial[i])) {
+                        ret = PTR_ERR(f_serial[i]);
+                        goto err_get_func;
+                }
+
+                ret = usb_add_function(c, f_serial[i]);
+                if (ret)
+                        goto err_add_func;
+        }
+
+        return 0;
+
+err_add_func:
+        usb_put_function(f_serial[i]);
+err_get_func:
+        usb_put_function_instance(fi_serial[i]);
+
+fail:
+        i--;
+        while (i >= 0) {
+                usb_remove_function(c, f_serial[i]);
+                usb_put_function(f_serial[i]);
+                usb_put_function_instance(fi_serial[i]);
+                i--;
+        }
+out:
+        return ret;
+}
+
 static int __init gs_bind(struct usb_composite_dev *cdev)
 {
         int                     status;
+        int                     cur_line;
 
-        status = gserial_setup(cdev->gadget, n_ports);
-        if (status < 0)
-                return status;
+        for (cur_line = 0; cur_line < n_ports; cur_line++) {
+                status = gserial_alloc_line(&tty_lines[cur_line]);
+                if (status)
+                        goto fail;
+        }
 
         /* Allocate string descriptor numbers ... note that string
          * contents can be overridden by the composite_dev glue.
@@ -178,8 +238,16 @@ static int __init gs_bind(struct usb_composite_dev *cdev)
         }
 
         /* register our configuration */
-        status = usb_add_config(cdev, &serial_config_driver,
-                        serial_bind_config);
+        if (use_acm) {
+                status  = serial_register_ports(cdev, &serial_config_driver,
+                                "acm");
+                usb_ep_autoconfig_reset(cdev->gadget);
+        } else if (use_obex)
+                status = usb_add_config(cdev, &serial_config_driver,
+                                serial_bind_obex_config);
+        else
+                status = usb_add_config(cdev, &serial_config_driver,
+                                serial_bind_gser_config);
         if (status < 0)
                 goto fail;
 
@@ -189,16 +257,31 @@ static int __init gs_bind(struct usb_composite_dev *cdev)
         return 0;
 
 fail:
-        gserial_cleanup();
+        cur_line--;
+        while (cur_line >= 0)
+                gserial_free_line(tty_lines[cur_line--]);
         return status;
 }
 
+static int gs_unbind(struct usb_composite_dev *cdev)
+{
+        int i;
+
+        for (i = 0; i < n_ports; i++) {
+                usb_put_function(f_serial[i]);
+                usb_put_function_instance(fi_serial[i]);
+                gserial_free_line(tty_lines[i]);
+        }
+        return 0;
+}
+
 static __refdata struct usb_composite_driver gserial_driver = {
         .name           = "g_serial",
         .dev            = &device_desc,
         .strings        = dev_strings,
         .max_speed      = USB_SPEED_SUPER,
         .bind           = gs_bind,
+        .unbind         = gs_unbind,
 };
 
 static int __init init(void)
@@ -234,6 +317,5 @@ module_init(init);
 static void __exit cleanup(void)
 {
         usb_composite_unregister(&gserial_driver);
-        gserial_cleanup();
 }
 module_exit(cleanup);
diff --git a/drivers/usb/gadget/storage_common.c b/drivers/usb/gadget/storage_common.c
index 0e3ae43454a2..4ecbf8496f48 100644
--- a/drivers/usb/gadget/storage_common.c
+++ b/drivers/usb/gadget/storage_common.c
@@ -93,18 +93,6 @@
 
 /*-------------------------------------------------------------------------*/
 
-/* CBI Interrupt data structure */
-struct interrupt_data {
-        u8      bType;
-        u8      bValue;
-};
-
-#define CBI_INTERRUPT_DATA_LEN          2
-
-/* CBI Accept Device-Specific Command request */
-#define USB_CBI_ADSC_REQUEST            0x00
-
-
 /* Length of a SCSI Command Data Block */
 #define MAX_COMMAND_SIZE        16
 
@@ -385,41 +373,6 @@ static struct usb_ss_ep_comp_descriptor fsg_ss_bulk_out_comp_desc = {
         /*.bMaxBurst =          DYNAMIC, */
 };
 
-static __maybe_unused struct usb_ext_cap_descriptor fsg_ext_cap_desc = {
-        .bLength =              USB_DT_USB_EXT_CAP_SIZE,
-        .bDescriptorType =      USB_DT_DEVICE_CAPABILITY,
-        .bDevCapabilityType =   USB_CAP_TYPE_EXT,
-
-        .bmAttributes =         cpu_to_le32(USB_LPM_SUPPORT),
-};
-
-static __maybe_unused struct usb_ss_cap_descriptor fsg_ss_cap_desc = {
-        .bLength =              USB_DT_USB_SS_CAP_SIZE,
-        .bDescriptorType =      USB_DT_DEVICE_CAPABILITY,
-        .bDevCapabilityType =   USB_SS_CAP_TYPE,
-
-        /* .bmAttributes = LTM is not supported yet */
-
-        .wSpeedSupported =      cpu_to_le16(USB_LOW_SPEED_OPERATION
-                | USB_FULL_SPEED_OPERATION
-                | USB_HIGH_SPEED_OPERATION
-                | USB_5GBPS_OPERATION),
-        .bFunctionalitySupport = USB_LOW_SPEED_OPERATION,
-        .bU1devExitLat =        USB_DEFAULT_U1_DEV_EXIT_LAT,
-        .bU2DevExitLat =        cpu_to_le16(USB_DEFAULT_U2_DEV_EXIT_LAT),
-};
-
-static __maybe_unused struct usb_bos_descriptor fsg_bos_desc = {
-        .bLength =              USB_DT_BOS_SIZE,
-        .bDescriptorType =      USB_DT_BOS,
-
-        .wTotalLength =         cpu_to_le16(USB_DT_BOS_SIZE
-                                + USB_DT_USB_EXT_CAP_SIZE
-                                + USB_DT_USB_SS_CAP_SIZE),
-
-        .bNumDeviceCaps =       2,
-};
-
 static struct usb_descriptor_header *fsg_ss_function[] = {
         (struct usb_descriptor_header *) &fsg_intf_desc,
         (struct usb_descriptor_header *) &fsg_ss_bulk_in_desc,
@@ -429,20 +382,6 @@ static struct usb_descriptor_header *fsg_ss_function[] = {
         NULL,
 };
 
-/* Maxpacket and other transfer characteristics vary by speed. */
-static __maybe_unused struct usb_endpoint_descriptor *
-fsg_ep_desc(struct usb_gadget *g, struct usb_endpoint_descriptor *fs,
-                struct usb_endpoint_descriptor *hs,
-                struct usb_endpoint_descriptor *ss)
-{
-        if (gadget_is_superspeed(g) && g->speed == USB_SPEED_SUPER)
-                return ss;
-        else if (gadget_is_dualspeed(g) && g->speed == USB_SPEED_HIGH)
-                return hs;
-        return fs;
-}
-
-
 /* Static strings, in UTF-8 (for simplicity we use only ASCII characters) */
 static struct usb_string                fsg_strings[] = {
         {FSG_STRING_INTERFACE,          fsg_string_interface},
diff --git a/drivers/usb/gadget/u_serial.c b/drivers/usb/gadget/u_serial.c
index 598dcc1212f0..588a9be18ef8 100644
--- a/drivers/usb/gadget/u_serial.c
+++ b/drivers/usb/gadget/u_serial.c
@@ -26,6 +26,7 @@
 #include <linux/tty_flip.h>
 #include <linux/slab.h>
 #include <linux/export.h>
+#include <linux/module.h>
 
 #include "u_serial.h"
 
@@ -35,11 +36,12 @@
  * "serial port" functionality through the USB gadget stack.  Each such
  * port is exposed through a /dev/ttyGS* node.
  *
- * After initialization (gserial_setup), these TTY port devices stay
- * available until they are removed (gserial_cleanup).  Each one may be
- * connected to a USB function (gserial_connect), or disconnected (with
- * gserial_disconnect) when the USB host issues a config change event.
- * Data can only flow when the port is connected to the host.
+ * After this module has been loaded, the individual TTY port can be requested
+ * (gserial_alloc_line()) and it will stay available until they are removed
+ * (gserial_free_line()). Each one may be connected to a USB function
+ * (gserial_connect), or disconnected (with gserial_disconnect) when the USB
+ * host issues a config change event. Data can only flow when the port is
+ * connected to the host.
  *
  * A given TTY port can be made available in multiple configurations.
  * For example, each one might expose a ttyGS0 node which provides a
@@ -119,13 +121,10 @@ struct gs_port {
         struct usb_cdc_line_coding port_line_coding;    /* 8-N-1 etc */
 };
 
-/* increase N_PORTS if you need more */
-#define N_PORTS         4
 static struct portmaster {
         struct mutex    lock;                   /* protect open/close */
         struct gs_port  *port;
-} ports[N_PORTS];
-static unsigned n_ports;
+} ports[MAX_U_SERIAL_PORTS];
 
 #define GS_CLOSE_TIMEOUT                15              /* seconds */
 
@@ -309,6 +308,7 @@ gs_alloc_req(struct usb_ep *ep, unsigned len, gfp_t kmalloc_flags)
 
         return req;
 }
+EXPORT_SYMBOL_GPL(gs_alloc_req);
 
 /*
  * gs_free_req
@@ -320,6 +320,7 @@ void gs_free_req(struct usb_ep *ep, struct usb_request *req)
         kfree(req->buf);
         usb_ep_free_request(ep, req);
 }
+EXPORT_SYMBOL_GPL(gs_free_req);
 
 /*
  * gs_send_packet
@@ -1030,10 +1031,19 @@ static int
 gs_port_alloc(unsigned port_num, struct usb_cdc_line_coding *coding)
 {
         struct gs_port  *port;
+        int             ret = 0;
+
+        mutex_lock(&ports[port_num].lock);
+        if (ports[port_num].port) {
+                ret = -EBUSY;
+                goto out;
+        }
 
         port = kzalloc(sizeof(struct gs_port), GFP_KERNEL);
-        if (port == NULL)
-                return -ENOMEM;
+        if (port == NULL) {
+                ret = -ENOMEM;
+                goto out;
+        }
 
         tty_port_init(&port->port);
         spin_lock_init(&port->port_lock);
@@ -1049,109 +1059,9 @@ gs_port_alloc(unsigned port_num, struct usb_cdc_line_coding *coding)
         port->port_line_coding = *coding;
 
         ports[port_num].port = port;
-
-        return 0;
-}
-
-/**
- * gserial_setup - initialize TTY driver for one or more ports
- * @g: gadget to associate with these ports
- * @count: how many ports to support
- * Context: may sleep
- *
- * The TTY stack needs to know in advance how many devices it should
- * plan to manage.  Use this call to set up the ports you will be
- * exporting through USB.  Later, connect them to functions based
- * on what configuration is activated by the USB host; and disconnect
- * them as appropriate.
- *
- * An example would be a two-configuration device in which both
- * configurations expose port 0, but through different functions.
- * One configuration could even expose port 1 while the other
- * one doesn't.
- *
- * Returns negative errno or zero.
- */
-int gserial_setup(struct usb_gadget *g, unsigned count)
-{
-        unsigned                        i;
-        struct usb_cdc_line_coding      coding;
-        int                             status;
-
-        if (count == 0 || count > N_PORTS)
-                return -EINVAL;
-
-        gs_tty_driver = alloc_tty_driver(count);
-        if (!gs_tty_driver)
-                return -ENOMEM;
-
-        gs_tty_driver->driver_name = "g_serial";
-        gs_tty_driver->name = PREFIX;
-        /* uses dynamically assigned dev_t values */
-
-        gs_tty_driver->type = TTY_DRIVER_TYPE_SERIAL;
-        gs_tty_driver->subtype = SERIAL_TYPE_NORMAL;
-        gs_tty_driver->flags = TTY_DRIVER_REAL_RAW | TTY_DRIVER_DYNAMIC_DEV;
-        gs_tty_driver->init_termios = tty_std_termios;
-
-        /* 9600-8-N-1 ... matches defaults expected by "usbser.sys" on
-         * MS-Windows.  Otherwise, most of these flags shouldn't affect
-         * anything unless we were to actually hook up to a serial line.
-         */
-        gs_tty_driver->init_termios.c_cflag =
-                        B9600 | CS8 | CREAD | HUPCL | CLOCAL;
-        gs_tty_driver->init_termios.c_ispeed = 9600;
-        gs_tty_driver->init_termios.c_ospeed = 9600;
-
-        coding.dwDTERate = cpu_to_le32(9600);
-        coding.bCharFormat = 8;
-        coding.bParityType = USB_CDC_NO_PARITY;
-        coding.bDataBits = USB_CDC_1_STOP_BITS;
-
-        tty_set_operations(gs_tty_driver, &gs_tty_ops);
-
-        /* make devices be openable */
-        for (i = 0; i < count; i++) {
-                mutex_init(&ports[i].lock);
-                status = gs_port_alloc(i, &coding);
-                if (status) {
-                        count = i;
-                        goto fail;
-                }
-        }
-        n_ports = count;
-
-        /* export the driver ... */
-        status = tty_register_driver(gs_tty_driver);
-        if (status) {
-                pr_err("%s: cannot register, err %d\n",
-                                __func__, status);
-                goto fail;
-        }
-
-        /* ... and sysfs class devices, so mdev/udev make /dev/ttyGS* */
-        for (i = 0; i < count; i++) {
-                struct device   *tty_dev;
-
-                tty_dev = tty_port_register_device(&ports[i].port->port,
-                                gs_tty_driver, i, &g->dev);
-                if (IS_ERR(tty_dev))
-                        pr_warning("%s: no classdev for port %d, err %ld\n",
-                                __func__, i, PTR_ERR(tty_dev));
-        }
-
-        pr_debug("%s: registered %d ttyGS* device%s\n", __func__,
-                        count, (count == 1) ? "" : "s");
-
-        return status;
-fail:
-        while (count--) {
-                tty_port_destroy(&ports[count].port->port);
-                kfree(ports[count].port);
-        }
-        put_tty_driver(gs_tty_driver);
-        gs_tty_driver = NULL;
-        return status;
+out:
+        mutex_unlock(&ports[port_num].lock);
+        return ret;
 }
 
 static int gs_closed(struct gs_port *port)
@@ -1164,55 +1074,77 @@ static int gs_closed(struct gs_port *port)
         return cond;
 }
 
-/**
- * gserial_cleanup - remove TTY-over-USB driver and devices
- * Context: may sleep
- *
- * This is called to free all resources allocated by @gserial_setup().
- * Accordingly, it may need to wait until some open /dev/ files have
- * closed.
- *
- * The caller must have issued @gserial_disconnect() for any ports
- * that had previously been connected, so that there is never any
- * I/O pending when it's called.
- */
-void gserial_cleanup(void)
+static void gserial_free_port(struct gs_port *port)
+{
+        tasklet_kill(&port->push);
+        /* wait for old opens to finish */
+        wait_event(port->port.close_wait, gs_closed(port));
+        WARN_ON(port->port_usb != NULL);
+        tty_port_destroy(&port->port);
+        kfree(port);
+}
+
+void gserial_free_line(unsigned char port_num)
 {
-        unsigned        i;
         struct gs_port  *port;
 
-        if (!gs_tty_driver)
+        mutex_lock(&ports[port_num].lock);
+        if (WARN_ON(!ports[port_num].port)) {
+                mutex_unlock(&ports[port_num].lock);
                 return;
+        }
+        port = ports[port_num].port;
+        ports[port_num].port = NULL;
+        mutex_unlock(&ports[port_num].lock);
 
-        /* start sysfs and /dev/ttyGS* node removal */
-        for (i = 0; i < n_ports; i++)
-                tty_unregister_device(gs_tty_driver, i);
-
-        for (i = 0; i < n_ports; i++) {
-                /* prevent new opens */
-                mutex_lock(&ports[i].lock);
-                port = ports[i].port;
-                ports[i].port = NULL;
-                mutex_unlock(&ports[i].lock);
-
-                tasklet_kill(&port->push);
+        gserial_free_port(port);
+        tty_unregister_device(gs_tty_driver, port_num);
+}
+EXPORT_SYMBOL_GPL(gserial_free_line);
 
-                /* wait for old opens to finish */
-                wait_event(port->port.close_wait, gs_closed(port));
+int gserial_alloc_line(unsigned char *line_num)
+{
+        struct usb_cdc_line_coding      coding;
+        struct device                   *tty_dev;
+        int                             ret;
+        int                             port_num;
 
-                WARN_ON(port->port_usb != NULL);
+        coding.dwDTERate = cpu_to_le32(9600);
+        coding.bCharFormat = 8;
+        coding.bParityType = USB_CDC_NO_PARITY;
+        coding.bDataBits = USB_CDC_1_STOP_BITS;
 
-                tty_port_destroy(&port->port);
-                kfree(port);
+        for (port_num = 0; port_num < MAX_U_SERIAL_PORTS; port_num++) {
+                ret = gs_port_alloc(port_num, &coding);
+                if (ret == -EBUSY)
+                        continue;
+                if (ret)
+                        return ret;
+                break;
         }
-        n_ports = 0;
+        if (ret)
+                return ret;
 
-        tty_unregister_driver(gs_tty_driver);
-        put_tty_driver(gs_tty_driver);
-        gs_tty_driver = NULL;
+        /* ... and sysfs class devices, so mdev/udev make /dev/ttyGS* */
+
+        tty_dev = tty_port_register_device(&ports[port_num].port->port,
+                        gs_tty_driver, port_num, NULL);
+        if (IS_ERR(tty_dev)) {
+                struct gs_port  *port;
+                pr_err("%s: failed to register tty for port %d, err %ld\n",
+                                __func__, port_num, PTR_ERR(tty_dev));
 
-        pr_debug("%s: cleaned up ttyGS* support\n", __func__);
+                ret = PTR_ERR(tty_dev);
+                port = ports[port_num].port;
+                ports[port_num].port = NULL;
+                gserial_free_port(port);
+                goto err;
+        }
+        *line_num = port_num;
+err:
+        return ret;
 }
+EXPORT_SYMBOL_GPL(gserial_alloc_line);
 
 /**
  * gserial_connect - notify TTY I/O glue that USB link is active
@@ -1229,8 +1161,8 @@ void gserial_cleanup(void)
  *
  * Caller needs to have set up the endpoints and USB function in @dev
  * before calling this, as well as the appropriate (speed-specific)
- * endpoint descriptors, and also have set up the TTY driver by calling
- * @gserial_setup().
+ * endpoint descriptors, and also have allocate @port_num by calling
+ * @gserial_alloc_line().
  *
  * Returns negative errno or zero.
  * On success, ep->driver_data will be overwritten.
@@ -1241,11 +1173,18 @@ int gserial_connect(struct gserial *gser, u8 port_num)
         unsigned long   flags;
         int             status;
 
-        if (!gs_tty_driver || port_num >= n_ports)
+        if (port_num >= MAX_U_SERIAL_PORTS)
                 return -ENXIO;
 
-        /* we "know" gserial_cleanup() hasn't been called */
         port = ports[port_num].port;
+        if (!port) {
+                pr_err("serial line %d not allocated.\n", port_num);
+                return -EINVAL;
+        }
+        if (port->port_usb) {
+                pr_err("serial line %d is in use.\n", port_num);
+                return -EBUSY;
+        }
 
         /* activate the endpoints */
         status = usb_ep_enable(gser->in);
@@ -1292,7 +1231,7 @@ fail_out:
         gser->in->driver_data = NULL;
         return status;
 }
-
+EXPORT_SYMBOL_GPL(gserial_connect);
 /**
  * gserial_disconnect - notify TTY I/O glue that USB link is inactive
  * @gser: the function, on which gserial_connect() was called
@@ -1347,3 +1286,65 @@ void gserial_disconnect(struct gserial *gser)
 
         spin_unlock_irqrestore(&port->port_lock, flags);
 }
+EXPORT_SYMBOL_GPL(gserial_disconnect);
+
+static int userial_init(void)
+{
+        unsigned                        i;
+        int                             status;
+
+        gs_tty_driver = alloc_tty_driver(MAX_U_SERIAL_PORTS);
+        if (!gs_tty_driver)
+                return -ENOMEM;
+
+        gs_tty_driver->driver_name = "g_serial";
+        gs_tty_driver->name = PREFIX;
+        /* uses dynamically assigned dev_t values */
+
+        gs_tty_driver->type = TTY_DRIVER_TYPE_SERIAL;
+        gs_tty_driver->subtype = SERIAL_TYPE_NORMAL;
+        gs_tty_driver->flags = TTY_DRIVER_REAL_RAW | TTY_DRIVER_DYNAMIC_DEV;
+        gs_tty_driver->init_termios = tty_std_termios;
+
+        /* 9600-8-N-1 ... matches defaults expected by "usbser.sys" on
+         * MS-Windows.  Otherwise, most of these flags shouldn't affect
+         * anything unless we were to actually hook up to a serial line.
+         */
+        gs_tty_driver->init_termios.c_cflag =
+                        B9600 | CS8 | CREAD | HUPCL | CLOCAL;
+        gs_tty_driver->init_termios.c_ispeed = 9600;
+        gs_tty_driver->init_termios.c_ospeed = 9600;
+
+        tty_set_operations(gs_tty_driver, &gs_tty_ops);
+        for (i = 0; i < MAX_U_SERIAL_PORTS; i++)
+                mutex_init(&ports[i].lock);
+
+        /* export the driver ... */
+        status = tty_register_driver(gs_tty_driver);
+        if (status) {
+                pr_err("%s: cannot register, err %d\n",
+                                __func__, status);
+                goto fail;
+        }
+
+        pr_debug("%s: registered %d ttyGS* device%s\n", __func__,
+                        MAX_U_SERIAL_PORTS,
+                        (MAX_U_SERIAL_PORTS == 1) ? "" : "s");
+
+        return status;
+fail:
+        put_tty_driver(gs_tty_driver);
+        gs_tty_driver = NULL;
+        return status;
+}
+module_init(userial_init);
+
+static void userial_cleanup(void)
+{
+        tty_unregister_driver(gs_tty_driver);
+        put_tty_driver(gs_tty_driver);
+        gs_tty_driver = NULL;
+}
+module_exit(userial_cleanup);
+
+MODULE_LICENSE("GPL");
diff --git a/drivers/usb/gadget/u_serial.h b/drivers/usb/gadget/u_serial.h
index 9b0fe6450fbf..66ce73a00509 100644
--- a/drivers/usb/gadget/u_serial.h
+++ b/drivers/usb/gadget/u_serial.h
@@ -15,6 +15,13 @@
 #include <linux/usb/composite.h>
 #include <linux/usb/cdc.h>
 
+#define MAX_U_SERIAL_PORTS      4
+
+struct f_serial_opts {
+        struct usb_function_instance func_inst;
+        u8 port_num;
+};
+
 /*
  * One non-multiplexed "serial" I/O port ... there can be several of these
  * on any given USB peripheral device, if it provides enough endpoints.
@@ -49,9 +56,9 @@ struct gserial {
 struct usb_request *gs_alloc_req(struct usb_ep *ep, unsigned len, gfp_t flags);
 void gs_free_req(struct usb_ep *, struct usb_request *req);
 
-/* port setup/teardown is handled by gadget driver */
-int gserial_setup(struct usb_gadget *g, unsigned n_ports);
-void gserial_cleanup(void);
+/* management of individual TTY ports */
+int gserial_alloc_line(unsigned char *port_line);
+void gserial_free_line(unsigned char port_line);
 
 /* connect/disconnect is handled by individual functions */
 int gserial_connect(struct gserial *, u8 port_num);
diff --git a/drivers/usb/gadget/udc-core.c b/drivers/usb/gadget/udc-core.c
index 4d90a800063c..2a9cd369f71c 100644
--- a/drivers/usb/gadget/udc-core.c
+++ b/drivers/usb/gadget/udc-core.c
@@ -102,28 +102,6 @@ EXPORT_SYMBOL_GPL(usb_gadget_unmap_request);
 /* ------------------------------------------------------------------------- */
 
 /**
- * usb_gadget_start - tells usb device controller to start up
- * @gadget: The gadget we want to get started
- * @driver: The driver we want to bind to @gadget
- * @bind: The bind function for @driver
- *
- * This call is issued by the UDC Class driver when it's about
- * to register a gadget driver to the device controller, before
- * calling gadget driver's bind() method.
- *
- * It allows the controller to be powered off until strictly
- * necessary to have it powered on.
- *
- * Returns zero on success, else negative errno.
- */
-static inline int usb_gadget_start(struct usb_gadget *gadget,
-                struct usb_gadget_driver *driver,
-                int (*bind)(struct usb_gadget *, struct usb_gadget_driver *))
-{
-        return gadget->ops->start(driver, bind);
-}
-
-/**
  * usb_gadget_udc_start - tells usb device controller to start up
  * @gadget: The gadget we want to get started
  * @driver: The driver we want to bind to @gadget
@@ -144,24 +122,6 @@ static inline int usb_gadget_udc_start(struct usb_gadget *gadget,
 }
 
 /**
- * usb_gadget_stop - tells usb device controller we don't need it anymore
- * @gadget: The device we want to stop activity
- * @driver: The driver to unbind from @gadget
- *
- * This call is issued by the UDC Class driver after calling
- * gadget driver's unbind() method.
- *
- * The details are implementation specific, but it can go as
- * far as powering off UDC completely and disable its data
- * line pullups.
- */
-static inline void usb_gadget_stop(struct usb_gadget *gadget,
-                struct usb_gadget_driver *driver)
-{
-        gadget->ops->stop(driver);
-}
-
-/**
  * usb_gadget_udc_stop - tells usb device controller we don't need it anymore
  * @gadget: The device we want to stop activity
  * @driver: The driver to unbind from @gadget
@@ -246,14 +206,6 @@ err1:
 }
 EXPORT_SYMBOL_GPL(usb_add_gadget_udc);
 
-static int udc_is_newstyle(struct usb_udc *udc)
-{
-        if (udc->gadget->ops->udc_start && udc->gadget->ops->udc_stop)
-                return 1;
-        return 0;
-}
-
-
 static void usb_gadget_remove_driver(struct usb_udc *udc)
 {
         dev_dbg(&udc->dev, "unregistering UDC driver [%s]\n",
@@ -261,14 +213,10 @@ static void usb_gadget_remove_driver(struct usb_udc *udc)
 
         kobject_uevent(&udc->dev.kobj, KOBJ_CHANGE);
 
-        if (udc_is_newstyle(udc)) {
-                usb_gadget_disconnect(udc->gadget);
-                udc->driver->disconnect(udc->gadget);
-                udc->driver->unbind(udc->gadget);
-                usb_gadget_udc_stop(udc->gadget, udc->driver);
-        } else {
-                usb_gadget_stop(udc->gadget, udc->driver);
-        }
+        usb_gadget_disconnect(udc->gadget);
+        udc->driver->disconnect(udc->gadget);
+        udc->driver->unbind(udc->gadget);
+        usb_gadget_udc_stop(udc->gadget, udc->driver);
 
         udc->driver = NULL;
         udc->dev.driver = NULL;
@@ -311,6 +259,62 @@ EXPORT_SYMBOL_GPL(usb_del_gadget_udc);
 
 /* ------------------------------------------------------------------------- */
 
+static int udc_bind_to_driver(struct usb_udc *udc, struct usb_gadget_driver *driver)
+{
+        int ret;
+
+        dev_dbg(&udc->dev, "registering UDC driver [%s]\n",
+                        driver->function);
+
+        udc->driver = driver;
+        udc->dev.driver = &driver->driver;
+
+        ret = driver->bind(udc->gadget, driver);
+        if (ret)
+                goto err1;
+        ret = usb_gadget_udc_start(udc->gadget, driver);
+        if (ret) {
+                driver->unbind(udc->gadget);
+                goto err1;
+        }
+        usb_gadget_connect(udc->gadget);
+
+        kobject_uevent(&udc->dev.kobj, KOBJ_CHANGE);
+        return 0;
+err1:
+        dev_err(&udc->dev, "failed to start %s: %d\n",
+                        udc->driver->function, ret);
+        udc->driver = NULL;
+        udc->dev.driver = NULL;
+        return ret;
+}
+
+int udc_attach_driver(const char *name, struct usb_gadget_driver *driver)
+{
+        struct usb_udc *udc = NULL;
+        int ret = -ENODEV;
+
+        mutex_lock(&udc_lock);
+        list_for_each_entry(udc, &udc_list, list) {
+                ret = strcmp(name, dev_name(&udc->dev));
+                if (!ret)
+                        break;
+        }
+        if (ret) {
+                ret = -ENODEV;
+                goto out;
+        }
+        if (udc->driver) {
+                ret = -EBUSY;
+                goto out;
+        }
+        ret = udc_bind_to_driver(udc, driver);
+out:
+        mutex_unlock(&udc_lock);
+        return ret;
+}
+EXPORT_SYMBOL_GPL(udc_attach_driver);
+
 int usb_gadget_probe_driver(struct usb_gadget_driver *driver)
 {
         struct usb_udc          *udc = NULL;
@@ -329,41 +333,8 @@ int usb_gadget_probe_driver(struct usb_gadget_driver *driver)
         pr_debug("couldn't find an available UDC\n");
         mutex_unlock(&udc_lock);
         return -ENODEV;
-
 found:
-        dev_dbg(&udc->dev, "registering UDC driver [%s]\n",
-                        driver->function);
-
-        udc->driver = driver;
-        udc->dev.driver = &driver->driver;
-
-        if (udc_is_newstyle(udc)) {
-                ret = driver->bind(udc->gadget, driver);
-                if (ret)
-                        goto err1;
-                ret = usb_gadget_udc_start(udc->gadget, driver);
-                if (ret) {
-                        driver->unbind(udc->gadget);
-                        goto err1;
-                }
-                usb_gadget_connect(udc->gadget);
-        } else {
-
-                ret = usb_gadget_start(udc->gadget, driver, driver->bind);
-                if (ret)
-                        goto err1;
-
-        }
-
-        kobject_uevent(&udc->dev.kobj, KOBJ_CHANGE);
-        mutex_unlock(&udc_lock);
-        return 0;
-
-err1:
-        dev_err(&udc->dev, "failed to start %s: %d\n",
-                        udc->driver->function, ret);
-        udc->driver = NULL;
-        udc->dev.driver = NULL;
+        ret = udc_bind_to_driver(udc, driver);
         mutex_unlock(&udc_lock);
         return ret;
 }
@@ -410,13 +381,11 @@ static ssize_t usb_udc_softconn_store(struct device *dev,
         struct usb_udc          *udc = container_of(dev, struct usb_udc, dev);
 
         if (sysfs_streq(buf, "connect")) {
-                if (udc_is_newstyle(udc))
-                        usb_gadget_udc_start(udc->gadget, udc->driver);
+                usb_gadget_udc_start(udc->gadget, udc->driver);
                 usb_gadget_connect(udc->gadget);
         } else if (sysfs_streq(buf, "disconnect")) {
                 usb_gadget_disconnect(udc->gadget);
-                if (udc_is_newstyle(udc))
-                        usb_gadget_udc_stop(udc->gadget, udc->driver);
+                usb_gadget_udc_stop(udc->gadget, udc->driver);
         } else {
                 dev_err(dev, "unsupported command '%s'\n", buf);
                 return -EINVAL;
diff --git a/drivers/usb/gadget/webcam.c b/drivers/usb/gadget/webcam.c
index 69cf5c2cd335..8cef1e658c29 100644
--- a/drivers/usb/gadget/webcam.c
+++ b/drivers/usb/gadget/webcam.c
@@ -336,7 +336,7 @@ static struct usb_configuration webcam_config_driver = {
         .bConfigurationValue    = 1,
         .iConfiguration         = 0, /* dynamic */
         .bmAttributes           = USB_CONFIG_ATT_SELFPOWER,
-        .bMaxPower              = CONFIG_USB_GADGET_VBUS_DRAW / 2,
+        .MaxPower               = CONFIG_USB_GADGET_VBUS_DRAW,
 };
 
 static int /* __init_or_exit */
diff --git a/drivers/usb/gadget/zero.c b/drivers/usb/gadget/zero.c
index 6bf4c0611365..685fa681cb65 100644
--- a/drivers/usb/gadget/zero.c
+++ b/drivers/usb/gadget/zero.c
@@ -10,7 +10,6 @@
  * (at your option) any later version.
  */
 
-
 /*
  * Gadget Zero only needs two bulk endpoints, and is an example of how you
  * can write a hardware-agnostic gadget driver running inside a USB device.
@@ -43,23 +42,11 @@
 #include <linux/kernel.h>
 #include <linux/slab.h>
 #include <linux/device.h>
+#include <linux/module.h>
+#include <linux/err.h>
+#include <linux/usb/composite.h>
 
 #include "g_zero.h"
-#include "gadget_chips.h"
-
-
-/*-------------------------------------------------------------------------*/
-
-/*
- * Kbuild is not very cooperative with respect to linking separately
- * compiled library objects into one module.  So for now we won't use
- * separate compilation ... ensuring init/exit sections work to shrink
- * the runtime footprint, and giving us at least some parts of what
- * a "gcc --combine ... part1.c part2.c part3.c ... " build would.
- */
-#include "f_sourcesink.c"
-#include "f_loopback.c"
-
 /*-------------------------------------------------------------------------*/
 USB_GADGET_COMPOSITE_OPTIONS();
 
@@ -67,9 +54,6 @@ USB_GADGET_COMPOSITE_OPTIONS();
 
 static const char longname[] = "Gadget Zero";
 
-unsigned buflen = 4096;         /* only used for bulk endpoints */
-module_param(buflen, uint, 0);
-
 /*
  * Normally the "loopback" configuration is second (index 1) so
  * it's not the default.  Here's where to change that order, to
@@ -79,6 +63,13 @@ module_param(buflen, uint, 0);
 static bool loopdefault = 0;
 module_param(loopdefault, bool, S_IRUGO|S_IWUSR);
 
+static struct usb_zero_options gzero_options = {
+        .isoc_interval = 4,
+        .isoc_maxpacket = 1024,
+        .bulk_buflen = 4096,
+        .qlen = 32,
+};
+
 /*-------------------------------------------------------------------------*/
 
 /* Thanks to NetChip Technologies for donating this product ID.
@@ -129,20 +120,27 @@ static struct usb_otg_descriptor otg_descriptor = {
         .bmAttributes =         USB_OTG_SRP | USB_OTG_HNP,
 };
 
-const struct usb_descriptor_header *otg_desc[] = {
+static const struct usb_descriptor_header *otg_desc[] = {
         (struct usb_descriptor_header *) &otg_descriptor,
         NULL,
 };
+#else
+#define otg_desc        NULL
 #endif
 
 /* string IDs are assigned dynamically */
 /* default serial number takes at least two packets */
 static char serial[] = "0123456789.0123456789.0123456789";
 
+#define USB_GZERO_SS_DESC       (USB_GADGET_FIRST_AVAIL_IDX + 0)
+#define USB_GZERO_LB_DESC       (USB_GADGET_FIRST_AVAIL_IDX + 1)
+
 static struct usb_string strings_dev[] = {
         [USB_GADGET_MANUFACTURER_IDX].s = "",
         [USB_GADGET_PRODUCT_IDX].s = longname,
         [USB_GADGET_SERIAL_IDX].s = serial,
+        [USB_GZERO_SS_DESC].s   = "source and sink data",
+        [USB_GZERO_LB_DESC].s   = "loop input to output",
         {  }                    /* end of list */
 };
 
@@ -158,58 +156,6 @@ static struct usb_gadget_strings *dev_strings[] = {
 
 /*-------------------------------------------------------------------------*/
 
-struct usb_request *alloc_ep_req(struct usb_ep *ep, int len)
-{
-        struct usb_request      *req;
-
-        req = usb_ep_alloc_request(ep, GFP_ATOMIC);
-        if (req) {
-                if (len)
-                        req->length = len;
-                else
-                        req->length = buflen;
-                req->buf = kmalloc(req->length, GFP_ATOMIC);
-                if (!req->buf) {
-                        usb_ep_free_request(ep, req);
-                        req = NULL;
-                }
-        }
-        return req;
-}
-
-void free_ep_req(struct usb_ep *ep, struct usb_request *req)
-{
-        kfree(req->buf);
-        usb_ep_free_request(ep, req);
-}
-
-static void disable_ep(struct usb_composite_dev *cdev, struct usb_ep *ep)
-{
-        int                     value;
-
-        if (ep->driver_data) {
-                value = usb_ep_disable(ep);
-                if (value < 0)
-                        DBG(cdev, "disable %s --> %d\n",
-                                        ep->name, value);
-                ep->driver_data = NULL;
-        }
-}
-
-void disable_endpoints(struct usb_composite_dev *cdev,
-                struct usb_ep *in, struct usb_ep *out,
-                struct usb_ep *iso_in, struct usb_ep *iso_out)
-{
-        disable_ep(cdev, in);
-        disable_ep(cdev, out);
-        if (iso_in)
-                disable_ep(cdev, iso_in);
-        if (iso_out)
-                disable_ep(cdev, iso_out);
-}
-
-/*-------------------------------------------------------------------------*/
-
 static struct timer_list        autoresume_timer;
 
 static void zero_autoresume(unsigned long _c)
@@ -251,8 +197,65 @@ static void zero_resume(struct usb_composite_dev *cdev)
 
 /*-------------------------------------------------------------------------*/
 
+static struct usb_configuration loopback_driver = {
+        .label          = "loopback",
+        .bConfigurationValue = 2,
+        .bmAttributes   = USB_CONFIG_ATT_SELFPOWER,
+        /* .iConfiguration = DYNAMIC */
+};
+
+static struct usb_function *func_ss;
+static struct usb_function_instance *func_inst_ss;
+
+static int ss_config_setup(struct usb_configuration *c,
+                const struct usb_ctrlrequest *ctrl)
+{
+        switch (ctrl->bRequest) {
+        case 0x5b:
+        case 0x5c:
+                return func_ss->setup(func_ss, ctrl);
+        default:
+                return -EOPNOTSUPP;
+        }
+}
+
+static struct usb_configuration sourcesink_driver = {
+        .label                  = "source/sink",
+        .setup                  = ss_config_setup,
+        .bConfigurationValue    = 3,
+        .bmAttributes           = USB_CONFIG_ATT_SELFPOWER,
+        /* .iConfiguration      = DYNAMIC */
+};
+
+module_param_named(buflen, gzero_options.bulk_buflen, uint, 0);
+module_param_named(pattern, gzero_options.pattern, uint, S_IRUGO|S_IWUSR);
+MODULE_PARM_DESC(pattern, "0 = all zeroes, 1 = mod63, 2 = none");
+
+module_param_named(isoc_interval, gzero_options.isoc_interval, uint,
+                S_IRUGO|S_IWUSR);
+MODULE_PARM_DESC(isoc_interval, "1 - 16");
+
+module_param_named(isoc_maxpacket, gzero_options.isoc_maxpacket, uint,
+                S_IRUGO|S_IWUSR);
+MODULE_PARM_DESC(isoc_maxpacket, "0 - 1023 (fs), 0 - 1024 (hs/ss)");
+
+module_param_named(isoc_mult, gzero_options.isoc_mult, uint, S_IRUGO|S_IWUSR);
+MODULE_PARM_DESC(isoc_mult, "0 - 2 (hs/ss only)");
+
+module_param_named(isoc_maxburst, gzero_options.isoc_maxburst, uint,
+                S_IRUGO|S_IWUSR);
+MODULE_PARM_DESC(isoc_maxburst, "0 - 15 (ss only)");
+
+static struct usb_function *func_lb;
+static struct usb_function_instance *func_inst_lb;
+
+module_param_named(qlen, gzero_options.qlen, uint, S_IRUGO|S_IWUSR);
+MODULE_PARM_DESC(qlen, "depth of loopback queue");
+
 static int __init zero_bind(struct usb_composite_dev *cdev)
 {
+        struct f_ss_opts        *ss_opts;
+        struct f_lb_opts        *lb_opts;
         int                     status;
 
         /* Allocate string descriptor numbers ... note that string
@@ -268,27 +271,105 @@ static int __init zero_bind(struct usb_composite_dev *cdev)
 
         setup_timer(&autoresume_timer, zero_autoresume, (unsigned long) cdev);
 
+        func_inst_ss = usb_get_function_instance("SourceSink");
+        if (IS_ERR(func_inst_ss))
+                return PTR_ERR(func_inst_ss);
+
+        ss_opts =  container_of(func_inst_ss, struct f_ss_opts, func_inst);
+        ss_opts->pattern = gzero_options.pattern;
+        ss_opts->isoc_interval = gzero_options.isoc_interval;
+        ss_opts->isoc_maxpacket = gzero_options.isoc_maxpacket;
+        ss_opts->isoc_mult = gzero_options.isoc_mult;
+        ss_opts->isoc_maxburst = gzero_options.isoc_maxpacket;
+        ss_opts->bulk_buflen = gzero_options.bulk_buflen;
+
+        func_ss = usb_get_function(func_inst_ss);
+        if (IS_ERR(func_ss))
+                goto err_put_func_inst_ss;
+
+        func_inst_lb = usb_get_function_instance("Loopback");
+        if (IS_ERR(func_inst_lb))
+                goto err_put_func_ss;
+
+        lb_opts = container_of(func_inst_lb, struct f_lb_opts, func_inst);
+        lb_opts->bulk_buflen = gzero_options.bulk_buflen;
+        lb_opts->qlen = gzero_options.qlen;
+
+        func_lb = usb_get_function(func_inst_lb);
+        if (IS_ERR(func_lb)) {
+                status = PTR_ERR(func_lb);
+                goto err_put_func_inst_lb;
+        }
+
+        sourcesink_driver.iConfiguration = strings_dev[USB_GZERO_SS_DESC].id;
+        loopback_driver.iConfiguration = strings_dev[USB_GZERO_LB_DESC].id;
+
+        /* support autoresume for remote wakeup testing */
+        sourcesink_driver.bmAttributes &= ~USB_CONFIG_ATT_WAKEUP;
+        loopback_driver.bmAttributes &= ~USB_CONFIG_ATT_WAKEUP;
+        sourcesink_driver.descriptors = NULL;
+        loopback_driver.descriptors = NULL;
+        if (autoresume) {
+                sourcesink_driver.bmAttributes |= USB_CONFIG_ATT_WAKEUP;
+                loopback_driver.bmAttributes |= USB_CONFIG_ATT_WAKEUP;
+        }
+
+        /* support OTG systems */
+        if (gadget_is_otg(cdev->gadget)) {
+                sourcesink_driver.descriptors = otg_desc;
+                sourcesink_driver.bmAttributes |= USB_CONFIG_ATT_WAKEUP;
+                loopback_driver.descriptors = otg_desc;
+                loopback_driver.bmAttributes |= USB_CONFIG_ATT_WAKEUP;
+        }
+
         /* Register primary, then secondary configuration.  Note that
          * SH3 only allows one config...
          */
         if (loopdefault) {
-                loopback_add(cdev, autoresume != 0);
-                sourcesink_add(cdev, autoresume != 0);
+                usb_add_config_only(cdev, &loopback_driver);
+                usb_add_config_only(cdev, &sourcesink_driver);
         } else {
-                sourcesink_add(cdev, autoresume != 0);
-                loopback_add(cdev, autoresume != 0);
+                usb_add_config_only(cdev, &sourcesink_driver);
+                usb_add_config_only(cdev, &loopback_driver);
         }
+        status = usb_add_function(&sourcesink_driver, func_ss);
+        if (status)
+                goto err_conf_flb;
+
+        usb_ep_autoconfig_reset(cdev->gadget);
+        status = usb_add_function(&loopback_driver, func_lb);
+        if (status)
+                goto err_conf_flb;
 
+        usb_ep_autoconfig_reset(cdev->gadget);
         usb_composite_overwrite_options(cdev, &coverwrite);
 
         INFO(cdev, "%s, version: " DRIVER_VERSION "\n", longname);
 
         return 0;
+
+err_conf_flb:
+        usb_put_function(func_lb);
+        func_lb = NULL;
+err_put_func_inst_lb:
+        usb_put_function_instance(func_inst_lb);
+        func_inst_lb = NULL;
+err_put_func_ss:
+        usb_put_function(func_ss);
+        func_ss = NULL;
+err_put_func_inst_ss:
+        usb_put_function_instance(func_inst_ss);
+        func_inst_ss = NULL;
+        return status;
 }
 
 static int zero_unbind(struct usb_composite_dev *cdev)
 {
         del_timer_sync(&autoresume_timer);
+        if (!IS_ERR_OR_NULL(func_ss))
+                usb_put_function(func_ss);
+        if (!IS_ERR_OR_NULL(func_lb))
+                usb_put_function(func_lb);
         return 0;
 }
 
diff --git a/drivers/usb/host/ehci-mv.c b/drivers/usb/host/ehci-mv.c
index 6c56297ea16b..3065809546b1 100644
--- a/drivers/usb/host/ehci-mv.c
+++ b/drivers/usb/host/ehci-mv.c
@@ -302,7 +302,6 @@ static int mv_ehci_remove(struct platform_device *pdev)
 {
         struct ehci_hcd_mv *ehci_mv = platform_get_drvdata(pdev);
         struct usb_hcd *hcd = ehci_mv->hcd;
-        int clk_i;
 
         if (hcd->rh_registered)
                 usb_remove_hcd(hcd);
diff --git a/drivers/usb/otg/mv_otg.c b/drivers/usb/otg/mv_otg.c
index eace975991a8..da2d60c06f15 100644
--- a/drivers/usb/otg/mv_otg.c
+++ b/drivers/usb/otg/mv_otg.c
@@ -662,18 +662,9 @@ static struct attribute_group inputs_attr_group = {
 int mv_otg_remove(struct platform_device *pdev)
 {
         struct mv_otg *mvotg = platform_get_drvdata(pdev);
-        int clk_i;
 
         sysfs_remove_group(&mvotg->pdev->dev.kobj, &inputs_attr_group);
 
-        if (mvotg->irq)
-                free_irq(mvotg->irq, mvotg);
-
-        if (mvotg->pdata->vbus)
-                free_irq(mvotg->pdata->vbus->irq, mvotg);
-        if (mvotg->pdata->id)
-                free_irq(mvotg->pdata->id->irq, mvotg);
-
         if (mvotg->qwork) {
                 flush_workqueue(mvotg->qwork);
                 destroy_workqueue(mvotg->qwork);
@@ -681,21 +672,9 @@ int mv_otg_remove(struct platform_device *pdev)
 
         mv_otg_disable(mvotg);
 
-        if (mvotg->cap_regs)
-                iounmap(mvotg->cap_regs);
-
-        if (mvotg->phy_regs)
-                iounmap(mvotg->phy_regs);
-
-        for (clk_i = 0; clk_i <= mvotg->clknum; clk_i++)
-                clk_put(mvotg->clk[clk_i]);
-
         usb_remove_phy(&mvotg->phy);
         platform_set_drvdata(pdev, NULL);
 
-        kfree(mvotg->phy.otg);
-        kfree(mvotg);
-
         return 0;
 }
 
@@ -714,17 +693,15 @@ static int mv_otg_probe(struct platform_device *pdev)
         }
 
         size = sizeof(*mvotg) + sizeof(struct clk *) * pdata->clknum;
-        mvotg = kzalloc(size, GFP_KERNEL);
+        mvotg = devm_kzalloc(&pdev->dev, size, GFP_KERNEL);
         if (!mvotg) {
                 dev_err(&pdev->dev, "failed to allocate memory!\n");
                 return -ENOMEM;
         }
 
-        otg = kzalloc(sizeof *otg, GFP_KERNEL);
-        if (!otg) {
-                kfree(mvotg);
+        otg = devm_kzalloc(&pdev->dev, sizeof(*otg), GFP_KERNEL);
+        if (!otg)
                 return -ENOMEM;
-        }
 
         platform_set_drvdata(pdev, mvotg);
 
@@ -733,18 +710,18 @@ static int mv_otg_probe(struct platform_device *pdev)
 
         mvotg->clknum = pdata->clknum;
         for (clk_i = 0; clk_i < mvotg->clknum; clk_i++) {
-                mvotg->clk[clk_i] = clk_get(&pdev->dev, pdata->clkname[clk_i]);
+                mvotg->clk[clk_i] = devm_clk_get(&pdev->dev,
+                                                pdata->clkname[clk_i]);
                 if (IS_ERR(mvotg->clk[clk_i])) {
                         retval = PTR_ERR(mvotg->clk[clk_i]);
-                        goto err_put_clk;
+                        return retval;
                 }
         }
 
         mvotg->qwork = create_singlethread_workqueue("mv_otg_queue");
         if (!mvotg->qwork) {
                 dev_dbg(&pdev->dev, "cannot create workqueue for OTG\n");
-                retval = -ENOMEM;
-                goto err_put_clk;
+                return -ENOMEM;
         }
 
         INIT_DELAYED_WORK(&mvotg->work, mv_otg_work);
@@ -772,7 +749,7 @@ static int mv_otg_probe(struct platform_device *pdev)
                 goto err_destroy_workqueue;
         }
 
-        mvotg->phy_regs = ioremap(r->start, resource_size(r));
+        mvotg->phy_regs = devm_ioremap(&pdev->dev, r->start, resource_size(r));
         if (mvotg->phy_regs == NULL) {
                 dev_err(&pdev->dev, "failed to map phy I/O memory\n");
                 retval = -EFAULT;
@@ -784,21 +761,21 @@ static int mv_otg_probe(struct platform_device *pdev)
         if (r == NULL) {
                 dev_err(&pdev->dev, "no I/O memory resource defined\n");
                 retval = -ENODEV;
-                goto err_unmap_phyreg;
+                goto err_destroy_workqueue;
         }
 
-        mvotg->cap_regs = ioremap(r->start, resource_size(r));
+        mvotg->cap_regs = devm_ioremap(&pdev->dev, r->start, resource_size(r));
         if (mvotg->cap_regs == NULL) {
                 dev_err(&pdev->dev, "failed to map I/O memory\n");
                 retval = -EFAULT;
-                goto err_unmap_phyreg;
+                goto err_destroy_workqueue;
         }
 
         /* we will acces controller register, so enable the udc controller */
         retval = mv_otg_enable_internal(mvotg);
         if (retval) {
                 dev_err(&pdev->dev, "mv otg enable error %d\n", retval);
-                goto err_unmap_capreg;
+                goto err_destroy_workqueue;
         }
 
         mvotg->op_regs =
@@ -806,9 +783,9 @@ static int mv_otg_probe(struct platform_device *pdev)
                         + (readl(mvotg->cap_regs) & CAPLENGTH_MASK));
 
         if (pdata->id) {
-                retval = request_threaded_irq(pdata->id->irq, NULL,
-                                              mv_otg_inputs_irq,
-                                              IRQF_ONESHOT, "id", mvotg);
+                retval = devm_request_threaded_irq(&pdev->dev, pdata->id->irq,
+                                                NULL, mv_otg_inputs_irq,
+                                                IRQF_ONESHOT, "id", mvotg);
                 if (retval) {
                         dev_info(&pdev->dev,
                                  "Failed to request irq for ID\n");
@@ -818,9 +795,9 @@ static int mv_otg_probe(struct platform_device *pdev)
 
         if (pdata->vbus) {
                 mvotg->clock_gating = 1;
-                retval = request_threaded_irq(pdata->vbus->irq, NULL,
-                                              mv_otg_inputs_irq,
-                                              IRQF_ONESHOT, "vbus", mvotg);
+                retval = devm_request_threaded_irq(&pdev->dev, pdata->vbus->irq,
+                                                NULL, mv_otg_inputs_irq,
+                                                IRQF_ONESHOT, "vbus", mvotg);
                 if (retval) {
                         dev_info(&pdev->dev,
                                  "Failed to request irq for VBUS, "
@@ -844,7 +821,7 @@ static int mv_otg_probe(struct platform_device *pdev)
         }
 
         mvotg->irq = r->start;
-        if (request_irq(mvotg->irq, mv_otg_irq, IRQF_SHARED,
+        if (devm_request_irq(&pdev->dev, mvotg->irq, mv_otg_irq, IRQF_SHARED,
                         driver_name, mvotg)) {
                 dev_err(&pdev->dev, "Request irq %d for OTG failed\n",
                         mvotg->irq);
@@ -857,14 +834,14 @@ static int mv_otg_probe(struct platform_device *pdev)
         if (retval < 0) {
                 dev_err(&pdev->dev, "can't register transceiver, %d\n",
                         retval);
-                goto err_free_irq;
+                goto err_disable_clk;
         }
 
         retval = sysfs_create_group(&pdev->dev.kobj, &inputs_attr_group);
         if (retval < 0) {
                 dev_dbg(&pdev->dev,
                         "Can't register sysfs attr group: %d\n", retval);
-                goto err_set_transceiver;
+                goto err_remove_phy;
         }
 
         spin_lock_init(&mvotg->wq_lock);
@@ -879,30 +856,15 @@ static int mv_otg_probe(struct platform_device *pdev)
 
         return 0;
 
-err_set_transceiver:
+err_remove_phy:
         usb_remove_phy(&mvotg->phy);
-err_free_irq:
-        free_irq(mvotg->irq, mvotg);
 err_disable_clk:
-        if (pdata->vbus)
-                free_irq(pdata->vbus->irq, mvotg);
-        if (pdata->id)
-                free_irq(pdata->id->irq, mvotg);
         mv_otg_disable_internal(mvotg);
-err_unmap_capreg:
-        iounmap(mvotg->cap_regs);
-err_unmap_phyreg:
-        iounmap(mvotg->phy_regs);
 err_destroy_workqueue:
         flush_workqueue(mvotg->qwork);
         destroy_workqueue(mvotg->qwork);
-err_put_clk:
-        for (clk_i--; clk_i >= 0; clk_i--)
-                clk_put(mvotg->clk[clk_i]);
 
         platform_set_drvdata(pdev, NULL);
-        kfree(otg);
-        kfree(mvotg);
 
         return retval;
 }
diff --git a/drivers/usb/renesas_usbhs/mod_gadget.c b/drivers/usb/renesas_usbhs/mod_gadget.c
index f2985cd88021..78fca978b2d0 100644
--- a/drivers/usb/renesas_usbhs/mod_gadget.c
+++ b/drivers/usb/renesas_usbhs/mod_gadget.c
@@ -900,7 +900,7 @@ static int usbhsg_set_selfpowered(struct usb_gadget *gadget, int is_self)
         return 0;
 }
 
-static struct usb_gadget_ops usbhsg_gadget_ops = {
+static const struct usb_gadget_ops usbhsg_gadget_ops = {
         .get_frame              = usbhsg_get_frame,
         .set_selfpowered        = usbhsg_set_selfpowered,
         .udc_start              = usbhsg_gadget_start,