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usb: gadget: uvc: default the ctrl request interface offsets

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For the userspace it is needed to distinguish between requests for the
control or streaming interface. The userspace would have to parse the
configfs to know which interface index it has to compare the ctrl
requests against. Since the interface numbers are not fixed, e.g. for
composite gadgets, the interface offset depends on the setup.

The kernel has this information when handing over the ctrl request to
the userspace. This patch removes the offset from the interface numbers
and expose the default interface defines in the uapi g_uvc.h.

Signed-off-by: Michael Grzeschik <m.grzeschik@pengutronix.de>
Link: https://lore.kernel.org/r/20221011075348.1786897-1-m.grzeschik@pengutronix.de
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Michael Grzeschik
2022-10-11 09:53:48 +02:00
committed by Greg Kroah-Hartman
parent 9b6447e04b
commit d182bf156c
2 changed files with 15 additions and 3 deletions
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include/uapi/linux/usb/g_uvc.h
+3
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@@ -21,6 +21,9 @@
#define UVC_EVENT_DATA (V4L2_EVENT_PRIVATE_START + 5)
#define UVC_EVENT_LAST (V4L2_EVENT_PRIVATE_START + 5)
#define UVC_STRING_CONTROL_IDX 0
#define UVC_STRING_STREAMING_IDX 1
struct uvc_request_data {
__s32 length;
__u8 data[60];