USB: gadget: f_accessory: New gadget driver for android USB accesories

Signed-off-by: Mike Lockwood <lockwood@android.com>

drivers/usb/gadget/Kconfig

@@ -884,6 +884,13 @@ config USB_ANDROID_RNDIS_WCEIS
          If you enable this option, the device is no longer CDC ethernet
          compatible.
 
+
+config USB_ANDROID_ACCESSORY
+	boolean "Android USB accessory function"
+	depends on USB_ANDROID
+	help
+	  Provides Android USB Accessory support for android gadget driver.
+
 config USB_CDC_COMPOSITE
 	tristate "CDC Composite Device (Ethernet and ACM)"
 	depends on NET

drivers/usb/gadget/Makefile

@@ -69,4 +69,5 @@ obj-$(CONFIG_USB_ANDROID_ADB)	+= f_adb.o
 obj-$(CONFIG_USB_ANDROID_MASS_STORAGE)	+= f_mass_storage.o
 obj-$(CONFIG_USB_ANDROID_MTP)	+= f_mtp.o
 obj-$(CONFIG_USB_ANDROID_RNDIS)	+= f_rndis.o u_ether.o
+obj-$(CONFIG_USB_ANDROID_ACCESSORY)	+= f_accessory.o
 

drivers/usb/gadget/android.c

@@ -404,6 +404,19 @@ void android_enable_function(struct usb_function *f, int enable)
 			}
 		}
 #endif
+#ifdef CONFIG_USB_ANDROID_ACCESSORY
+		if (!strcmp(f->name, "accessory") && enable) {
+			struct usb_function		*func;
+
+		    /* disable everything else (and keep adb for now) */
+			list_for_each_entry(func, &android_config_driver.functions, list) {
+				if (strcmp(func->name, "accessory")
+					&& strcmp(func->name, "adb")) {
+					usb_function_set_enabled(func, 0);
+				}
+			}
+        }
+#endif
 
 		device_desc.idVendor = __constant_cpu_to_le16(get_vendor_id(dev));
 		device_desc.idProduct = __constant_cpu_to_le16(get_product_id(dev));