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[media] uvcvideo: Document the struct uvc_xu_control_query query field 

Several developers have reported that the lack of macros for the struct
uvc_xu_control_query query field in uvcvideo.h was confusing and forced
them to look at the driver source code to find out what applications
were supposed to pass in that field.

Add a comment to the header to clarify the expected usage of the query
field.

Reported-by: Paulo Assis <pj.assis@gmail.com>
Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>
This commit is contained in:
Laurent Pinchart 2012-05-14 04:34:34 -03:00 committed by Mauro Carvalho Chehab
parent 257ee97eeb
commit 7078daa020
1 changed files with 2 additions and 1 deletions
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3
include/linux/uvcvideo.h
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@ -58,7 +58,8 @@ struct uvc_xu_control_mapping {
struct uvc_xu_control_query {
__u8 unit;
__u8 selector;
__u8 query;
__u8 query; /* Video Class-Specific Request Code, */
/* defined in linux/usb/video.h A.8. */
__u16 size;
__u8 __user *data;
};