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.

Andrey Konovalov committed 3 years ago

Commit c3a383d1 parent 1f97e3f2 files · +56 −10Browse files

Showing the changes to include/uapi/linux/usb (1 of 2 files). Show all

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include/uapi/linux/usb/raw_gadget.h+12−2

@@ -44,6 +44,16 @@ enum usb_raw_event_type { · 43 unmodified lines
44	44	/* This event is queued when a new control request arrived to ep0. */
45	45	USB_RAW_EVENT_CONTROL = 2,
46	46
	47	+ /*
	48	+ * These events are queued when the gadget driver is suspended,
	49	+ * resumed, reset, or disconnected. Note that some UDCs (e.g. dwc2)
	50	+ * report a disconnect event instead of a reset.
	51	+ */
	52	+ USB_RAW_EVENT_SUSPEND = 3,
	53	+ USB_RAW_EVENT_RESUME = 4,
	54	+ USB_RAW_EVENT_RESET = 5,
	55	+ USB_RAW_EVENT_DISCONNECT = 6,
	56	+
47	57	/* The list might grow in the future. */
48	58	};
49	59
@@ -54,8 +64,8 @@ enum usb_raw_event_type { · 4 unmodified lines
54	64	* actual length of the fetched event data.
55	65	* @data: A buffer to store the fetched event data.
56	66	*
57		− * Currently the fetched data buffer is empty for USB_RAW_EVENT_CONNECT,
58		− * and contains struct usb_ctrlrequest for USB_RAW_EVENT_CONTROL.
	67	+ * The fetched event data buffer contains struct usb_ctrlrequest for
	68	+ * USB_RAW_EVENT_CONTROL and is empty for other events.
59	69	*/
60	70	struct usb_raw_event {
61	71	__u32 type;