Hi Ricardo,
Thank you for the patch.
Maybe s/Entity defined/Allow entity-defined/ in the subject line ?
On Tue, Dec 15, 2020 at 04:44:34PM +0100, Ricardo Ribalda wrote:
> Allows controls to get their properties and current value
> from an entity-defined function instead of via a query to the USB
> device.
>
> Signed-off-by: Ricardo Ribalda <riba...@chromium.org>
> ---
> drivers/media/usb/uvc/uvc_ctrl.c | 22 ++++++++++++++++++----
> drivers/media/usb/uvc/uvcvideo.h | 5 +++++
> 2 files changed, 23 insertions(+), 4 deletions(-)
>
> diff --git a/drivers/media/usb/uvc/uvc_ctrl.c
> b/drivers/media/usb/uvc/uvc_ctrl.c
> index 9f6174a10e73..531816762892 100644
> --- a/drivers/media/usb/uvc/uvc_ctrl.c
> +++ b/drivers/media/usb/uvc/uvc_ctrl.c
> @@ -980,10 +980,20 @@ static int __uvc_ctrl_get(struct uvc_video_chain *chain,
> return -EACCES;
>
> if (!ctrl->loaded) {
> - ret = uvc_query_ctrl(chain->dev, UVC_GET_CUR, ctrl->entity->id,
> - chain->dev->intfnum, ctrl->info.selector,
> + if (ctrl->entity->get_cur) {
> + ret = ctrl->entity->get_cur(chain->dev,
> + ctrl->entity,
> + ctrl->info.selector,
> uvc_ctrl_data(ctrl, UVC_CTRL_DATA_CURRENT),
> ctrl->info.size);
> + } else {
> + ret = uvc_query_ctrl(chain->dev, UVC_GET_CUR,
> + ctrl->entity->id,
> + chain->dev->intfnum,
> + ctrl->info.selector,
> + uvc_ctrl_data(ctrl, UVC_CTRL_DATA_CURRENT),
> + ctrl->info.size);
We could possibly set entity->get_cur by default to a function wrapping
uvc_query_ctrl() to avoid the condition here. This isn't mandatory for
now though, but I'll toy with it on top of the series to avoid storing
function pointers in a non-const structure.
Reviewed-by: Laurent Pinchart <laurent.pinch...@ideasonboard.com>
> + }
> if (ret < 0)
> return ret;
>
> @@ -1687,8 +1697,12 @@ static int uvc_ctrl_get_flags(struct uvc_device *dev,
> if (data == NULL)
> return -ENOMEM;
>
> - ret = uvc_query_ctrl(dev, UVC_GET_INFO, ctrl->entity->id, dev->intfnum,
> - info->selector, data, 1);
> + if (ctrl->entity->get_info)
> + ret = ctrl->entity->get_info(dev, ctrl->entity,
> + ctrl->info.selector, data);
> + else
> + ret = uvc_query_ctrl(dev, UVC_GET_INFO, ctrl->entity->id,
> + dev->intfnum, info->selector, data, 1);
> if (!ret)
> info->flags |= (data[0] & UVC_CONTROL_CAP_GET ?
> UVC_CTRL_FLAG_GET_CUR : 0)
> diff --git a/drivers/media/usb/uvc/uvcvideo.h
> b/drivers/media/usb/uvc/uvcvideo.h
> index 00f985001c1d..ae464ba83f4f 100644
> --- a/drivers/media/usb/uvc/uvcvideo.h
> +++ b/drivers/media/usb/uvc/uvcvideo.h
> @@ -353,6 +353,11 @@ struct uvc_entity {
> u8 bNrInPins;
> u8 *baSourceID;
>
> + int (*get_info)(struct uvc_device *dev, struct uvc_entity *entity,
> + u8 cs, u8 *caps);
> + int (*get_cur)(struct uvc_device *dev, struct uvc_entity *entity,
> + u8 cs, void *data, u16 size);
> +
> unsigned int ncontrols;
> struct uvc_control *controls;
> };
--
Regards,
Laurent Pinchart
