Revert "usb: gadget: Add function wakeup support"

This reverts commit e36d975b04 which is
commit f0db885fb0 upstream.

It breaks the Android kernel abi and can be brought back in the future
in an abi-safe way if it is really needed.

Bug: 161946584
Change-Id: I56b3a1daccf44443aa4142534777b97bb3a70d14
Signed-off-by: Greg Kroah-Hartman <gregkh@google.com>

drivers/usb/gadget/composite.c

@@ -490,46 +490,6 @@ int usb_interface_id(struct usb_configuration *config,
 }
 EXPORT_SYMBOL_GPL(usb_interface_id);
 
-/**
- * usb_func_wakeup - sends function wake notification to the host.
- * @func: function that sends the remote wakeup notification.
- *
- * Applicable to devices operating at enhanced superspeed when usb
- * functions are put in function suspend state and armed for function
- * remote wakeup. On completion, function wake notification is sent. If
- * the device is in low power state it tries to bring the device to active
- * state before sending the wake notification. Since it is a synchronous
- * call, caller must take care of not calling it in interrupt context.
- * For devices operating at lower speeds  returns negative errno.
- *
- * Returns zero on success, else negative errno.
- */
-int usb_func_wakeup(struct usb_function *func)
-{
-	struct usb_gadget	*gadget = func->config->cdev->gadget;
-	int			id;
-
-	if (!gadget->ops->func_wakeup)
-		return -EOPNOTSUPP;
-
-	if (!func->func_wakeup_armed) {
-		ERROR(func->config->cdev, "not armed for func remote wakeup\n");
-		return -EINVAL;
-	}
-
-	for (id = 0; id < MAX_CONFIG_INTERFACES; id++)
-		if (func->config->interface[id] == func)
-			break;
-
-	if (id == MAX_CONFIG_INTERFACES) {
-		ERROR(func->config->cdev, "Invalid function\n");
-		return -EINVAL;
-	}
-
-	return gadget->ops->func_wakeup(gadget, id);
-}
-EXPORT_SYMBOL_GPL(usb_func_wakeup);
-
 static u8 encode_bMaxPower(enum usb_device_speed speed,
 		struct usb_configuration *c)
 {

include/linux/usb/composite.h

@@ -149,9 +149,6 @@ struct usb_os_desc_table {
  *	GetStatus() request when the recipient is Interface.
  * @func_suspend: callback to be called when
  *	SetFeature(FUNCTION_SUSPEND) is reseived
- * @func_suspended: Indicates whether the function is in function suspend state.
- * @func_wakeup_armed: Indicates whether the function is armed by the host for
- *	wakeup signaling.
  *
  * A single USB function uses one or more interfaces, and should in most
  * cases support operation at both full and high speeds.  Each function is
@@ -222,8 +219,6 @@ struct usb_function {
 	int			(*get_status)(struct usb_function *);
 	int			(*func_suspend)(struct usb_function *,
 						u8 suspend_opt);
-	bool			func_suspended;
-	bool			func_wakeup_armed;
 	/* private: */
 	/* internals */
 	struct list_head		list;
@@ -245,7 +240,6 @@ int config_ep_by_speed_and_alt(struct usb_gadget *g, struct usb_function *f,
 
 int config_ep_by_speed(struct usb_gadget *g, struct usb_function *f,
 			struct usb_ep *_ep);
-int usb_func_wakeup(struct usb_function *func);
 
 #define	MAX_CONFIG_INTERFACES		16	/* arbitrary; max 255 */
 

include/linux/usb/gadget.h

@@ -315,7 +315,6 @@ struct usb_udc;
 struct usb_gadget_ops {
 	int	(*get_frame)(struct usb_gadget *);
 	int	(*wakeup)(struct usb_gadget *);
-	int	(*func_wakeup)(struct usb_gadget *gadget, int intf_id);
 	int	(*set_selfpowered) (struct usb_gadget *, int is_selfpowered);
 	int	(*vbus_session) (struct usb_gadget *, int is_active);
 	int	(*vbus_draw) (struct usb_gadget *, unsigned mA);