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media: uvcvideo: Allow custom control mapping

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Some advanced controls might not be completely implemented by vendors.

If the controls are a enumeration, UVC does not gives a way to probe
what is implemented and what is not.

Let's create a new callback function where heuristics can be implemented
to detect what is implemented and what not and update the control
mapping accordingly.

Reviewed-by: Sergey Senozhatsky <senozhatsky@chromium.org>
Signed-off-by: Ricardo Ribalda <ribalda@chromium.org>
Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Reviewed-by: Ricardo Ribalda <ribalda@chromium.org>
This commit is contained in:
Ricardo Ribalda 2024-06-10 23:09:52 +00:00 committed by Laurent Pinchart
parent 9e3d55fbd1
commit 8f4362a8d4
2 changed files with 12 additions and 0 deletions
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7
drivers/media/usb/uvc/uvc_ctrl.c
View File

@ -2659,6 +2659,13 @@ static void uvc_ctrl_init_ctrl(struct uvc_video_chain *chain,
for (i = 0; i < ARRAY_SIZE(uvc_ctrl_mappings); ++i) {
const struct uvc_control_mapping *mapping = &uvc_ctrl_mappings[i];
/* Let the device provide a custom mapping. */
if (mapping->filter_mapping) {
mapping = mapping->filter_mapping(chain, ctrl);
if (!mapping)
continue;
}
if (uvc_entity_match_guid(ctrl->entity, mapping->entity) &&
ctrl->info.selector == mapping->selector)
__uvc_ctrl_add_mapping(chain, ctrl, mapping);

5
drivers/media/usb/uvc/uvcvideo.h
View File

@ -87,7 +87,9 @@
struct gpio_desc;
struct sg_table;
struct uvc_control;
struct uvc_device;
struct uvc_video_chain;
/*
* TODO: Put the most frequently accessed fields at the beginning of
@ -126,6 +128,9 @@ struct uvc_control_mapping {
s32 master_manual;
u32 slave_ids[2];
const struct uvc_control_mapping *(*filter_mapping)
(struct uvc_video_chain *chain,
struct uvc_control *ctrl);
s32 (*get)(struct uvc_control_mapping *mapping, u8 query,
const u8 *data);
void (*set)(struct uvc_control_mapping *mapping, s32 value,