5 files changed, 285 insertions, 21 deletions

diff --git a/drivers/usb/otg/Kconfig b/drivers/usb/otg/Kconfig
index ee55b449ffd..aa884d072f0 100644
--- a/drivers/usb/otg/Kconfig
+++ b/drivers/usb/otg/Kconfig
@@ -43,7 +43,7 @@ config ISP1301_OMAP
 
 config TWL4030_USB
         tristate "TWL4030 USB Transceiver Driver"
-        depends on TWL4030_CORE
+        depends on TWL4030_CORE && REGULATOR_TWL4030
         select USB_OTG_UTILS
         help
           Enable this to support the USB OTG transceiver on TWL4030
@@ -51,4 +51,12 @@ config TWL4030_USB
           This transceiver supports high and full speed devices plus,
           in host mode, low speed.
 
+config NOP_USB_XCEIV
+        tristate "NOP USB Transceiver Driver"
+        select USB_OTG_UTILS
+        help
+         this driver is to be used by all the usb transceiver which are either
+         built-in with usb ip or which are autonomous and doesn't require any
+         phy programming such as ISP1x04 etc.
+
 endif # USB || OTG
diff --git a/drivers/usb/otg/Makefile b/drivers/usb/otg/Makefile
index d73c7cf5e2f..20816785652 100644
--- a/drivers/usb/otg/Makefile
+++ b/drivers/usb/otg/Makefile
@@ -9,6 +9,7 @@ obj-$(CONFIG_USB_OTG_UTILS)	+= otg.o
 obj-$(CONFIG_USB_GPIO_VBUS)     += gpio_vbus.o
 obj-$(CONFIG_ISP1301_OMAP)      += isp1301_omap.o
 obj-$(CONFIG_TWL4030_USB)       += twl4030-usb.o
+obj-$(CONFIG_NOP_USB_XCEIV)     += nop-usb-xceiv.o
 
 ccflags-$(CONFIG_USB_DEBUG)     += -DDEBUG
 ccflags-$(CONFIG_USB_GADGET_DEBUG) += -DDEBUG
diff --git a/drivers/usb/otg/gpio_vbus.c b/drivers/usb/otg/gpio_vbus.c
index 63a6036f04b..1c26c94513e 100644
--- a/drivers/usb/otg/gpio_vbus.c
+++ b/drivers/usb/otg/gpio_vbus.c
@@ -13,6 +13,7 @@
 #include <linux/gpio.h>
 #include <linux/interrupt.h>
 #include <linux/usb.h>
+#include <linux/workqueue.h>
 
 #include <linux/regulator/consumer.h>
 
@@ -34,6 +35,7 @@ struct gpio_vbus_data {
         struct regulator       *vbus_draw;
         int                     vbus_draw_enabled;
         unsigned                mA;
+        struct work_struct      work;
 };
 
 
@@ -76,24 +78,26 @@ static void set_vbus_draw(struct gpio_vbus_data *gpio_vbus, unsigned mA)
         gpio_vbus->mA = mA;
 }
 
-/* VBUS change IRQ handler */
-static irqreturn_t gpio_vbus_irq(int irq, void *data)
+static int is_vbus_powered(struct gpio_vbus_mach_info *pdata)
 {
-        struct platform_device *pdev = data;
-        struct gpio_vbus_mach_info *pdata = pdev->dev.platform_data;
-        struct gpio_vbus_data *gpio_vbus = platform_get_drvdata(pdev);
-        int gpio, vbus;
+        int vbus;
 
         vbus = gpio_get_value(pdata->gpio_vbus);
         if (pdata->gpio_vbus_inverted)
                 vbus = !vbus;
 
-        dev_dbg(&pdev->dev, "VBUS %s (gadget: %s)\n",
-                vbus ? "supplied" : "inactive",
-                gpio_vbus->otg.gadget ? gpio_vbus->otg.gadget->name : "none");
+        return vbus;
+}
+
+static void gpio_vbus_work(struct work_struct *work)
+{
+        struct gpio_vbus_data *gpio_vbus =
+                container_of(work, struct gpio_vbus_data, work);
+        struct gpio_vbus_mach_info *pdata = gpio_vbus->dev->platform_data;
+        int gpio;
 
         if (!gpio_vbus->otg.gadget)
-                return IRQ_HANDLED;
+                return;
 
         /* Peripheral controllers which manage the pullup themselves won't have
          * gpio_pullup configured here.  If it's configured here, we'll do what
@@ -101,7 +105,7 @@ static irqreturn_t gpio_vbus_irq(int irq, void *data)
          * that may complicate usb_gadget_{,dis}connect() support.
          */
         gpio = pdata->gpio_pullup;
-        if (vbus) {
+        if (is_vbus_powered(pdata)) {
                 gpio_vbus->otg.state = OTG_STATE_B_PERIPHERAL;
                 usb_gadget_vbus_connect(gpio_vbus->otg.gadget);
 
@@ -121,6 +125,21 @@ static irqreturn_t gpio_vbus_irq(int irq, void *data)
                 usb_gadget_vbus_disconnect(gpio_vbus->otg.gadget);
                 gpio_vbus->otg.state = OTG_STATE_B_IDLE;
         }
+}
+
+/* VBUS change IRQ handler */
+static irqreturn_t gpio_vbus_irq(int irq, void *data)
+{
+        struct platform_device *pdev = data;
+        struct gpio_vbus_mach_info *pdata = pdev->dev.platform_data;
+        struct gpio_vbus_data *gpio_vbus = platform_get_drvdata(pdev);
+
+        dev_dbg(&pdev->dev, "VBUS %s (gadget: %s)\n",
+                is_vbus_powered(pdata) ? "supplied" : "inactive",
+                gpio_vbus->otg.gadget ? gpio_vbus->otg.gadget->name : "none");
+
+        if (gpio_vbus->otg.gadget)
+                schedule_work(&gpio_vbus->work);
 
         return IRQ_HANDLED;
 }
@@ -257,6 +276,7 @@ static int __init gpio_vbus_probe(struct platform_device *pdev)
                         irq, err);
                 goto err_irq;
         }
+        INIT_WORK(&gpio_vbus->work, gpio_vbus_work);
 
         /* only active when a gadget is registered */
         err = otg_set_transceiver(&gpio_vbus->otg);
diff --git a/drivers/usb/otg/nop-usb-xceiv.c b/drivers/usb/otg/nop-usb-xceiv.c
new file mode 100644
index 00000000000..4b933f646f2
--- /dev/null
+++ b/drivers/usb/otg/nop-usb-xceiv.c
@@ -0,0 +1,180 @@
+/*
+ * drivers/usb/otg/nop-usb-xceiv.c
+ *
+ * NOP USB transceiver for all USB transceiver which are either built-in
+ * into USB IP or which are mostly autonomous.
+ *
+ * Copyright (C) 2009 Texas Instruments Inc
+ * Author: Ajay Kumar Gupta <ajay.gupta@ti.com>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+ *
+ * Current status:
+ *      this is to add "nop" transceiver for all those phy which is
+ *      autonomous such as isp1504 etc.
+ */
+
+#include <linux/module.h>
+#include <linux/platform_device.h>
+#include <linux/dma-mapping.h>
+#include <linux/usb/otg.h>
+
+struct nop_usb_xceiv {
+        struct otg_transceiver  otg;
+        struct device           *dev;
+};
+
+static u64 nop_xceiv_dmamask = DMA_32BIT_MASK;
+
+static struct platform_device nop_xceiv_device = {
+        .name           = "nop_usb_xceiv",
+        .id             = -1,
+        .dev = {
+                .dma_mask               = &nop_xceiv_dmamask,
+                .coherent_dma_mask      = DMA_32BIT_MASK,
+                .platform_data          = NULL,
+        },
+};
+
+void usb_nop_xceiv_register(void)
+{
+        if (platform_device_register(&nop_xceiv_device) < 0) {
+                printk(KERN_ERR "Unable to register usb nop transceiver\n");
+                return;
+        }
+}
+
+void usb_nop_xceiv_unregister(void)
+{
+        platform_device_unregister(&nop_xceiv_device);
+}
+
+static inline struct nop_usb_xceiv *xceiv_to_nop(struct otg_transceiver *x)
+{
+        return container_of(x, struct nop_usb_xceiv, otg);
+}
+
+static int nop_set_suspend(struct otg_transceiver *x, int suspend)
+{
+        return 0;
+}
+
+static int nop_set_peripheral(struct otg_transceiver *x,
+                struct usb_gadget *gadget)
+{
+        struct nop_usb_xceiv *nop;
+
+        if (!x)
+                return -ENODEV;
+
+        nop = xceiv_to_nop(x);
+
+        if (!gadget) {
+                nop->otg.gadget = NULL;
+                return -ENODEV;
+        }
+
+        nop->otg.gadget = gadget;
+        nop->otg.state = OTG_STATE_B_IDLE;
+        return 0;
+}
+
+static int nop_set_host(struct otg_transceiver *x, struct usb_bus *host)
+{
+        struct nop_usb_xceiv *nop;
+
+        if (!x)
+                return -ENODEV;
+
+        nop = xceiv_to_nop(x);
+
+        if (!host) {
+                nop->otg.host = NULL;
+                return -ENODEV;
+        }
+
+        nop->otg.host = host;
+        return 0;
+}
+
+static int __devinit nop_usb_xceiv_probe(struct platform_device *pdev)
+{
+        struct nop_usb_xceiv    *nop;
+        int err;
+
+        nop = kzalloc(sizeof *nop, GFP_KERNEL);
+        if (!nop)
+                return -ENOMEM;
+
+        nop->dev                = &pdev->dev;
+        nop->otg.dev            = nop->dev;
+        nop->otg.label          = "nop-xceiv";
+        nop->otg.state          = OTG_STATE_UNDEFINED;
+        nop->otg.set_host       = nop_set_host;
+        nop->otg.set_peripheral = nop_set_peripheral;
+        nop->otg.set_suspend    = nop_set_suspend;
+
+        err = otg_set_transceiver(&nop->otg);
+        if (err) {
+                dev_err(&pdev->dev, "can't register transceiver, err: %d\n",
+                        err);
+                goto exit;
+        }
+
+        platform_set_drvdata(pdev, nop);
+
+        return 0;
+exit:
+        kfree(nop);
+        return err;
+}
+
+static int __devexit nop_usb_xceiv_remove(struct platform_device *pdev)
+{
+        struct nop_usb_xceiv *nop = platform_get_drvdata(pdev);
+
+        otg_set_transceiver(NULL);
+
+        platform_set_drvdata(pdev, NULL);
+        kfree(nop);
+
+        return 0;
+}
+
+static struct platform_driver nop_usb_xceiv_driver = {
+        .probe          = nop_usb_xceiv_probe,
+        .remove         = __devexit_p(nop_usb_xceiv_remove),
+        .driver         = {
+                .name   = "nop_usb_xceiv",
+                .owner  = THIS_MODULE,
+        },
+};
+
+static int __init nop_usb_xceiv_init(void)
+{
+        return platform_driver_register(&nop_usb_xceiv_driver);
+}
+subsys_initcall(nop_usb_xceiv_init);
+
+static void __exit nop_usb_xceiv_exit(void)
+{
+        platform_driver_unregister(&nop_usb_xceiv_driver);
+}
+module_exit(nop_usb_xceiv_exit);
+
+MODULE_ALIAS("platform:nop_usb_xceiv");
+MODULE_AUTHOR("Texas Instruments Inc");
+MODULE_DESCRIPTION("NOP USB Transceiver driver");
+MODULE_LICENSE("GPL");
diff --git a/drivers/usb/otg/twl4030-usb.c b/drivers/usb/otg/twl4030-usb.c
index 416e4410be0..d9478d0e1c8 100644
--- a/drivers/usb/otg/twl4030-usb.c
+++ b/drivers/usb/otg/twl4030-usb.c
@@ -34,6 +34,8 @@
 #include <linux/delay.h>
 #include <linux/usb/otg.h>
 #include <linux/i2c/twl4030.h>
+#include <linux/regulator/consumer.h>
+#include <linux/err.h>
 
 
 /* Register defines */
@@ -246,6 +248,11 @@ struct twl4030_usb {
         struct otg_transceiver  otg;
         struct device           *dev;
 
+        /* TWL4030 internal USB regulator supplies */
+        struct regulator        *usb1v5;
+        struct regulator        *usb1v8;
+        struct regulator        *usb3v1;
+
         /* for vbus reporting with irqs disabled */
         spinlock_t              lock;
 
@@ -434,6 +441,18 @@ static void twl4030_phy_power(struct twl4030_usb *twl, int on)
 
         pwr = twl4030_usb_read(twl, PHY_PWR_CTRL);
         if (on) {
+                regulator_enable(twl->usb3v1);
+                regulator_enable(twl->usb1v8);
+                /*
+                 * Disabling usb3v1 regulator (= writing 0 to VUSB3V1_DEV_GRP
+                 * in twl4030) resets the VUSB_DEDICATED2 register. This reset
+                 * enables VUSB3V1_SLEEP bit that remaps usb3v1 ACTIVE state to
+                 * SLEEP. We work around this by clearing the bit after usv3v1
+                 * is re-activated. This ensures that VUSB3V1 is really active.
+                 */
+                twl4030_i2c_write_u8(TWL4030_MODULE_PM_RECEIVER, 0,
+                                                        VUSB_DEDICATED2);
+                regulator_enable(twl->usb1v5);
                 pwr &= ~PHY_PWR_PHYPWD;
                 WARN_ON(twl4030_usb_write_verify(twl, PHY_PWR_CTRL, pwr) < 0);
                 twl4030_usb_write(twl, PHY_CLK_CTRL,
@@ -443,6 +462,9 @@ static void twl4030_phy_power(struct twl4030_usb *twl, int on)
         } else  {
                 pwr |= PHY_PWR_PHYPWD;
                 WARN_ON(twl4030_usb_write_verify(twl, PHY_PWR_CTRL, pwr) < 0);
+                regulator_disable(twl->usb1v5);
+                regulator_disable(twl->usb1v8);
+                regulator_disable(twl->usb3v1);
         }
 }
 
@@ -468,7 +490,7 @@ static void twl4030_phy_resume(struct twl4030_usb *twl)
         twl->asleep = 0;
 }
 
-static void twl4030_usb_ldo_init(struct twl4030_usb *twl)
+static int twl4030_usb_ldo_init(struct twl4030_usb *twl)
 {
         /* Enable writing to power configuration registers */
         twl4030_i2c_write_u8(TWL4030_MODULE_PM_MASTER, 0xC0, PROTECT_KEY);
@@ -480,20 +502,45 @@ static void twl4030_usb_ldo_init(struct twl4030_usb *twl)
         /* input to VUSB3V1 LDO is from VBAT, not VBUS */
         twl4030_i2c_write_u8(TWL4030_MODULE_PM_RECEIVER, 0x14, VUSB_DEDICATED1);
 
-        /* turn on 3.1V regulator */
-        twl4030_i2c_write_u8(TWL4030_MODULE_PM_RECEIVER, 0x20, VUSB3V1_DEV_GRP);
+        /* Initialize 3.1V regulator */
+        twl4030_i2c_write_u8(TWL4030_MODULE_PM_RECEIVER, 0, VUSB3V1_DEV_GRP);
+
+        twl->usb3v1 = regulator_get(twl->dev, "usb3v1");
+        if (IS_ERR(twl->usb3v1))
+                return -ENODEV;
+
         twl4030_i2c_write_u8(TWL4030_MODULE_PM_RECEIVER, 0, VUSB3V1_TYPE);
 
-        /* turn on 1.5V regulator */
-        twl4030_i2c_write_u8(TWL4030_MODULE_PM_RECEIVER, 0x20, VUSB1V5_DEV_GRP);
+        /* Initialize 1.5V regulator */
+        twl4030_i2c_write_u8(TWL4030_MODULE_PM_RECEIVER, 0, VUSB1V5_DEV_GRP);
+
+        twl->usb1v5 = regulator_get(twl->dev, "usb1v5");
+        if (IS_ERR(twl->usb1v5))
+                goto fail1;
+
         twl4030_i2c_write_u8(TWL4030_MODULE_PM_RECEIVER, 0, VUSB1V5_TYPE);
 
-        /* turn on 1.8V regulator */
-        twl4030_i2c_write_u8(TWL4030_MODULE_PM_RECEIVER, 0x20, VUSB1V8_DEV_GRP);
+        /* Initialize 1.8V regulator */
+        twl4030_i2c_write_u8(TWL4030_MODULE_PM_RECEIVER, 0, VUSB1V8_DEV_GRP);
+
+        twl->usb1v8 = regulator_get(twl->dev, "usb1v8");
+        if (IS_ERR(twl->usb1v8))
+                goto fail2;
+
         twl4030_i2c_write_u8(TWL4030_MODULE_PM_RECEIVER, 0, VUSB1V8_TYPE);
 
         /* disable access to power configuration registers */
         twl4030_i2c_write_u8(TWL4030_MODULE_PM_MASTER, 0, PROTECT_KEY);
+
+        return 0;
+
+fail2:
+        regulator_put(twl->usb1v5);
+        twl->usb1v5 = NULL;
+fail1:
+        regulator_put(twl->usb3v1);
+        twl->usb3v1 = NULL;
+        return -ENODEV;
 }
 
 static ssize_t twl4030_usb_vbus_show(struct device *dev,
@@ -598,7 +645,7 @@ static int __init twl4030_usb_probe(struct platform_device *pdev)
 {
         struct twl4030_usb_data *pdata = pdev->dev.platform_data;
         struct twl4030_usb      *twl;
-        int                     status;
+        int                     status, err;
 
         if (!pdata) {
                 dev_dbg(&pdev->dev, "platform_data not available\n");
@@ -622,7 +669,12 @@ static int __init twl4030_usb_probe(struct platform_device *pdev)
         /* init spinlock for workqueue */
         spin_lock_init(&twl->lock);
 
-        twl4030_usb_ldo_init(twl);
+        err = twl4030_usb_ldo_init(twl);
+        if (err) {
+                dev_err(&pdev->dev, "ldo init failed\n");
+                kfree(twl);
+                return err;
+        }
         otg_set_transceiver(&twl->otg);
 
         platform_set_drvdata(pdev, twl);
@@ -688,6 +740,9 @@ static int __exit twl4030_usb_remove(struct platform_device *pdev)
         twl4030_usb_clear_bits(twl, POWER_CTRL, POWER_CTRL_OTG_ENAB);
 
         twl4030_phy_power(twl, 0);
+        regulator_put(twl->usb1v5);
+        regulator_put(twl->usb1v8);
+        regulator_put(twl->usb3v1);
 
         kfree(twl);