usb: raw-gadget: report suspend, resume, reset, and disconnect events

Update USB_RAW_IOCTL_EVENT_FETCH to also report suspend, resume, reset,
and disconnect events.

This allows the code that emulates a USB device via Raw Gadget to handle
these events. For example, the device can restart enumeration when it
gets reset.

Also do not print a WARNING when the event queue overflows. With these new
events being queued, the queue might overflow if the device emulation code
stops fetching events.

Also print debug messages when a non-control event is received.

Signed-off-by: Andrey Konovalov <andreyknvl@gmail.com>
Link: https://lore.kernel.org/r/d610b629a5f32fb76c24012180743f7f0f1872c0.1698350424.git.andreyknvl@gmail.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

1 files changed, 12 insertions, 2 deletions

diff --git a/include/uapi/linux/usb/raw_gadget.h b/include/uapi/linux/usb/raw_gadget.h
index c7d2199134d7..f0224a8dc858 100644
--- a/include/uapi/linux/usb/raw_gadget.h
+++ b/include/uapi/linux/usb/raw_gadget.h
@@ -44,6 +44,16 @@ enum usb_raw_event_type {
 	/* This event is queued when a new control request arrived to ep0. */
 	USB_RAW_EVENT_CONTROL = 2,
 
+	/*
+	 * These events are queued when the gadget driver is suspended,
+	 * resumed, reset, or disconnected. Note that some UDCs (e.g. dwc2)
+	 * report a disconnect event instead of a reset.
+	 */
+	USB_RAW_EVENT_SUSPEND = 3,
+	USB_RAW_EVENT_RESUME = 4,
+	USB_RAW_EVENT_RESET = 5,
+	USB_RAW_EVENT_DISCONNECT = 6,
+
 	/* The list might grow in the future. */
 };
 
@@ -54,8 +64,8 @@ enum usb_raw_event_type {
  *     actual length of the fetched event data.
  * @data: A buffer to store the fetched event data.
  *
- * Currently the fetched data buffer is empty for USB_RAW_EVENT_CONNECT,
- * and contains struct usb_ctrlrequest for USB_RAW_EVENT_CONTROL.
+ * The fetched event data buffer contains struct usb_ctrlrequest for
+ * USB_RAW_EVENT_CONTROL and is empty for other events.
  */
 struct usb_raw_event {
 	__u32		type;