USB: gadget: gadget_is_{dualspeed,otg} predicates and cleanup

This adds two small inlines to the gadget stack, which will
often evaluate to compile-time constants.  That can help
shrink object code and remove #ifdeffery.

 - gadget_is_dualspeed(), currently always a compile-time
   constant (depending on which controller is selected).

 - gadget_is_otg(), usually a compile time "false", but this
   is a runtime test if the platform enables OTG (since it's
   reasonable to populate boards with different USB sockets).

It also updates two peripheral controller drivers to use these:

 - fsl_usb2_udc, mostly OTG-related bugfixes:  non-OTG devices
   must follow the rules about drawing VBUS power, and OTG ones
   need to reject invalid SET_FEATURE requests.

 - omap_udc, just scrubbing a bit of #ifdeffery.

And also gadgetfs, which lost some #ifdefs and moved to a more
standard handling of DEBUG and VERBOSE_DEBUG.

The main benefits come from patches which will follow.

Signed-off-by: David Brownell <dbrownell@users.sourceforge.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

4 files changed, 59 insertions, 37 deletions

diff --git a/drivers/usb/gadget/fsl_usb2_udc.c b/drivers/usb/gadget/fsl_usb2_udc.c
index d57bcfbc08a5..89c768e2aed7 100644
--- a/drivers/usb/gadget/fsl_usb2_udc.c
+++ b/drivers/usb/gadget/fsl_usb2_udc.c
@@ -1090,14 +1090,11 @@ static int fsl_vbus_session(struct usb_gadget *gadget, int is_active)
  */
 static int fsl_vbus_draw(struct usb_gadget *gadget, unsigned mA)
 {
-#ifdef CONFIG_USB_OTG
         struct fsl_udc *udc;
 
         udc = container_of(gadget, struct fsl_udc, gadget);
-
         if (udc->transceiver)
                 return otg_set_power(udc->transceiver, mA);
-#endif
         return -ENOTSUPP;
 }
 
@@ -1321,7 +1318,7 @@ static void setup_received_irq(struct fsl_udc *udc,
                                 | USB_TYPE_STANDARD)) {
                         /* Note: The driver has not include OTG support yet.
                          * This will be set when OTG support is added */
-                        if (!udc->gadget.is_otg)
+                        if (!gadget_is_otg(udc->gadget))
                                 break;
                         else if (setup->bRequest == USB_DEVICE_B_HNP_ENABLE)
                                 udc->gadget.b_hnp_enable = 1;
@@ -1330,6 +1327,8 @@ static void setup_received_irq(struct fsl_udc *udc,
                         else if (setup->bRequest ==
                                         USB_DEVICE_A_ALT_HNP_SUPPORT)
                                 udc->gadget.a_alt_hnp_support = 1;
+                        else
+                                break;
                         rc = 0;
                 } else
                         break;
@@ -1840,10 +1839,8 @@ int usb_gadget_unregister_driver(struct usb_gadget_driver *driver)
         if (!driver || driver != udc_controller->driver || !driver->unbind)
                 return -EINVAL;
 
-#ifdef CONFIG_USB_OTG
         if (udc_controller->transceiver)
                 (void)otg_set_peripheral(udc_controller->transceiver, 0);
-#endif
 
         /* stop DR, disable intr */
         dr_controller_stop(udc_controller);
diff --git a/drivers/usb/gadget/inode.c b/drivers/usb/gadget/inode.c
index 173004f60fea..129eda5358f7 100644
--- a/drivers/usb/gadget/inode.c
+++ b/drivers/usb/gadget/inode.c
@@ -20,8 +20,7 @@
  */
 
 
-// #define      DEBUG                   /* data to help fault diagnosis */
-// #define      VERBOSE         /* extra debug messages (success too) */
+/* #define VERBOSE_DEBUG */
 
 #include <linux/init.h>
 #include <linux/module.h>
@@ -253,7 +252,7 @@ static const char *CHIP;
         do { } while (0)
 #endif /* DEBUG */
 
-#ifdef VERBOSE
+#ifdef VERBOSE_DEBUG
 #define VDEBUG  DBG
 #else
 #define VDEBUG(dev,fmt,args...) \
@@ -1010,11 +1009,12 @@ ep0_read (struct file *fd, char __user *buf, size_t len, loff_t *ptr)
                         /* assume that was SET_CONFIGURATION */
                         if (dev->current_config) {
                                 unsigned power;
-#ifdef  CONFIG_USB_GADGET_DUALSPEED
-                                if (dev->gadget->speed == USB_SPEED_HIGH)
+
+                                if (gadget_is_dualspeed(dev->gadget)
+                                                && (dev->gadget->speed
+                                                        == USB_SPEED_HIGH))
                                         power = dev->hs_config->bMaxPower;
                                 else
-#endif
                                         power = dev->config->bMaxPower;
                                 usb_gadget_vbus_draw(dev->gadget, 2 * power);
                         }
@@ -1355,24 +1355,21 @@ static int
 config_buf (struct dev_data *dev, u8 type, unsigned index)
 {
         int             len;
-#ifdef CONFIG_USB_GADGET_DUALSPEED
-        int             hs;
-#endif
+        int             hs = 0;
 
         /* only one configuration */
         if (index > 0)
                 return -EINVAL;
 
-#ifdef CONFIG_USB_GADGET_DUALSPEED
-        hs = (dev->gadget->speed == USB_SPEED_HIGH);
-        if (type == USB_DT_OTHER_SPEED_CONFIG)
-                hs = !hs;
+        if (gadget_is_dualspeed(dev->gadget)) {
+                hs = (dev->gadget->speed == USB_SPEED_HIGH);
+                if (type == USB_DT_OTHER_SPEED_CONFIG)
+                        hs = !hs;
+        }
         if (hs) {
                 dev->req->buf = dev->hs_config;
                 len = le16_to_cpu(dev->hs_config->wTotalLength);
-        } else
-#endif
-        {
+        } else {
                 dev->req->buf = dev->config;
                 len = le16_to_cpu(dev->config->wTotalLength);
         }
@@ -1393,13 +1390,13 @@ gadgetfs_setup (struct usb_gadget *gadget, const struct usb_ctrlrequest *ctrl)
         spin_lock (&dev->lock);
         dev->setup_abort = 0;
         if (dev->state == STATE_DEV_UNCONNECTED) {
-#ifdef  CONFIG_USB_GADGET_DUALSPEED
-                if (gadget->speed == USB_SPEED_HIGH && dev->hs_config == NULL) {
+                if (gadget_is_dualspeed(gadget)
+                                && gadget->speed == USB_SPEED_HIGH
+                                && dev->hs_config == NULL) {
                         spin_unlock(&dev->lock);
                         ERROR (dev, "no high speed config??\n");
                         return -EINVAL;
                 }
-#endif  /* CONFIG_USB_GADGET_DUALSPEED */
 
                 dev->state = STATE_DEV_CONNECTED;
                 dev->dev->bMaxPacketSize0 = gadget->ep0->maxpacket;
@@ -1469,13 +1466,12 @@ gadgetfs_setup (struct usb_gadget *gadget, const struct usb_ctrlrequest *ctrl)
                         // user mode expected to disable endpoints
                 } else {
                         u8      config, power;
-#ifdef  CONFIG_USB_GADGET_DUALSPEED
-                        if (gadget->speed == USB_SPEED_HIGH) {
+
+                        if (gadget_is_dualspeed(gadget)
+                                        && gadget->speed == USB_SPEED_HIGH) {
                                 config = dev->hs_config->bConfigurationValue;
                                 power = dev->hs_config->bMaxPower;
-                        } else
-#endif
-                        {
+                        } else {
                                 config = dev->config->bConfigurationValue;
                                 power = dev->config->bMaxPower;
                         }
diff --git a/drivers/usb/gadget/omap_udc.c b/drivers/usb/gadget/omap_udc.c
index 9b0f0925dddf..bf2788dfb32b 100644
--- a/drivers/usb/gadget/omap_udc.c
+++ b/drivers/usb/gadget/omap_udc.c
@@ -1241,19 +1241,15 @@ static void pullup_enable(struct omap_udc *udc)
         udc->gadget.dev.parent->power.power_state = PMSG_ON;
         udc->gadget.dev.power.power_state = PMSG_ON;
         UDC_SYSCON1_REG |= UDC_PULLUP_EN;
-#ifndef CONFIG_USB_OTG
-        if (!cpu_is_omap15xx())
+        if (!gadget_is_otg(udc->gadget) && !cpu_is_omap15xx())
                 OTG_CTRL_REG |= OTG_BSESSVLD;
-#endif
         UDC_IRQ_EN_REG = UDC_DS_CHG_IE;
 }
 
 static void pullup_disable(struct omap_udc *udc)
 {
-#ifndef CONFIG_USB_OTG
-        if (!cpu_is_omap15xx())
+        if (!gadget_is_otg(udc->gadget) && !cpu_is_omap15xx())
                 OTG_CTRL_REG &= ~OTG_BSESSVLD;
-#endif
         UDC_IRQ_EN_REG = UDC_DS_CHG_IE;
         UDC_SYSCON1_REG &= ~UDC_PULLUP_EN;
 }
@@ -1390,7 +1386,7 @@ static void update_otg(struct omap_udc *udc)
 {
         u16     devstat;
 
-        if (!udc->gadget.is_otg)
+        if (!gadget_is_otg(udc->gadget))
                 return;
 
         if (OTG_CTRL_REG & OTG_ID)
diff --git a/include/linux/usb_gadget.h b/include/linux/usb_gadget.h
index ec9732e7fea2..5ea611e48ec1 100644
--- a/include/linux/usb_gadget.h
+++ b/include/linux/usb_gadget.h
@@ -480,6 +480,39 @@ static inline void *get_gadget_data (struct usb_gadget *gadget)
 
 
 /**
+ * gadget_is_dualspeed - return true iff the hardware handles high speed
+ * @gadget: controller that might support both high and full speeds
+ */
+static inline int gadget_is_dualspeed(struct usb_gadget *g)
+{
+#ifdef CONFIG_USB_GADGET_DUALSPEED
+        /* runtime test would check "g->is_dualspeed" ... that might be
+         * useful to work around hardware bugs, but is mostly pointless
+         */
+        return 1;
+#else
+        return 0;
+#endif
+}
+
+/**
+ * gadget_is_otg - return true iff the hardware is OTG-ready
+ * @gadget: controller that might have a Mini-AB connector
+ *
+ * This is a runtime test, since kernels with a USB-OTG stack sometimes
+ * run on boards which only have a Mini-B (or Mini-A) connector.
+ */
+static inline int gadget_is_otg(struct usb_gadget *g)
+{
+#ifdef CONFIG_USB_OTG
+        return g->is_otg;
+#else
+        return 0;
+#endif
+}
+
+
+/**
  * usb_gadget_frame_number - returns the current frame number
  * @gadget: controller that reports the frame number
  *