Re: [PATCH v7 6/7] media: uvcvideo: support V4L2_CTRL_WHICH_MIN/MAX_VAL

Ricardo Ribalda
2022-06-30T06:42:15Z

On Tue, 28 Jun 2022 at 09:57, Yunke Cao <yunkec@google.com> wrote:
>
> Add support for V4L2_CTRL_WHICH_MIN/MAX_VAL in uvc driver.
> It is useful for the V4L2_CID_UVC_REGION_OF_INTEREST_RECT control.
>
> Signed-off-by: Yunke Cao <yunkec@google.com>
Reviewed-by: Ricardo Ribalda <ribalda@chromium.org>
> ---
> drivers/media/usb/uvc/uvc_ctrl.c | 73 ++++++++++++++++++++++++++------
> drivers/media/usb/uvc/uvc_v4l2.c | 11 +++--
> drivers/media/usb/uvc/uvcvideo.h | 3 +-
> 3 files changed, 70 insertions(+), 17 deletions(-)
>
> diff --git a/drivers/media/usb/uvc/uvc_ctrl.c b/drivers/media/usb/uvc/uvc_ctrl.c
> index 00482269233a..b569d6824ac1 100644
> --- a/drivers/media/usb/uvc/uvc_ctrl.c
> +++ b/drivers/media/usb/uvc/uvc_ctrl.c
> @@ -1923,7 +1923,7 @@ int uvc_ctrl_get(struct uvc_video_chain *chain,
> }
>
> int __uvc_ctrl_get_fixed_std(struct uvc_video_chain *chain,
> - struct v4l2_ext_control *xctrl)
> + struct v4l2_ext_control *xctrl, u32 v4l2_which)
> {
> struct v4l2_queryctrl qc = { .id = xctrl->id };
> int ret = uvc_query_v4l2_ctrl(chain, &qc);
> @@ -1931,16 +1931,69 @@ int __uvc_ctrl_get_fixed_std(struct uvc_video_chain *chain,
> if (ret < 0)
> return ret;
>
> - xctrl->value = qc.default_value;
> + switch (v4l2_which) {
> + case V4L2_CTRL_WHICH_DEF_VAL:
> + xctrl->value = qc.default_value;
> + break;
> + case V4L2_CTRL_WHICH_MIN_VAL:
> + xctrl->value = qc.minimum;
> + break;
> + case V4L2_CTRL_WHICH_MAX_VAL:
> + xctrl->value = qc.maximum;
> + break;
> + default:
> + return -EINVAL;
> + }
> +
> return 0;
> }
>
> +static int __uvc_ctrl_get_fixed_compound(struct uvc_video_chain *chain,
> + struct uvc_control_mapping *mapping,
> + struct uvc_control *ctrl,
> + u32 v4l2_which,
> + struct v4l2_ext_control *xctrl)
> +{
> + int ret;
> + u32 flag, id;
> +
> + if (mapping->v4l2_type < V4L2_CTRL_COMPOUND_TYPES)
> + return -EINVAL;
> +
> + switch (v4l2_which) {
> + case V4L2_CTRL_WHICH_DEF_VAL:
> + flag = UVC_CTRL_FLAG_GET_DEF;
> + id = UVC_CTRL_DATA_DEF;
> + break;
> + case V4L2_CTRL_WHICH_MIN_VAL:
> + flag = UVC_CTRL_FLAG_GET_MIN;
> + id = UVC_CTRL_DATA_MIN;
> + break;
> + case V4L2_CTRL_WHICH_MAX_VAL:
> + flag = UVC_CTRL_FLAG_GET_MAX;
> + id = UVC_CTRL_DATA_MAX;
> + break;
> + default:
> + return -EINVAL;
> + }
> +
> + if (!(ctrl->info.flags & flag) && flag != UVC_CTRL_FLAG_GET_DEF)
> + return -EACCES;
> +
> + if (!ctrl->cached) {
> + ret = uvc_ctrl_populate_cache(chain, ctrl);
> + if (ret < 0)
> + return ret;
> + }
> +
> + return __uvc_ctrl_get_compound_to_user(mapping, ctrl, id, xctrl);
> +}
> +
> int uvc_ctrl_get_fixed(struct uvc_video_chain *chain,
> - struct v4l2_ext_control *xctrl)
> + struct v4l2_ext_control *xctrl, u32 v4l2_which)
> {
> struct uvc_control *ctrl;
> struct uvc_control_mapping *mapping;
> - int ret;
>
> if (__uvc_query_v4l2_class(chain, xctrl->id, 0) >= 0)
> return -EACCES;
> @@ -1950,16 +2003,10 @@ int uvc_ctrl_get_fixed(struct uvc_video_chain *chain,
> return -EINVAL;
>
> if (mapping->v4l2_type < V4L2_CTRL_COMPOUND_TYPES)
> - return __uvc_ctrl_get_fixed_std(chain, xctrl);
> + return __uvc_ctrl_get_fixed_std(chain, xctrl, v4l2_which);
>
> - if (!ctrl->cached) {
> - ret = uvc_ctrl_populate_cache(chain, ctrl);
> - if (ret < 0)
> - return ret;
> - }
> -
> - return __uvc_ctrl_get_compound_to_user(mapping, ctrl, UVC_CTRL_DATA_DEF,
> - xctrl);
> + return __uvc_ctrl_get_fixed_compound(chain, mapping, ctrl, v4l2_which,
> + xctrl);
> }
>
> int __uvc_ctrl_set_compound(struct uvc_control_mapping *mapping,
> diff --git a/drivers/media/usb/uvc/uvc_v4l2.c b/drivers/media/usb/uvc/uvc_v4l2.c
> index aad61af36271..004e3b764737 100644
> --- a/drivers/media/usb/uvc/uvc_v4l2.c
> +++ b/drivers/media/usb/uvc/uvc_v4l2.c
> @@ -1043,16 +1043,21 @@ static int uvc_ioctl_g_ext_ctrls(struct file *file, void *fh,
> if (ret < 0)
> return ret;
>
> - if (ctrls->which == V4L2_CTRL_WHICH_DEF_VAL) {
> + switch (ctrls->which) {
> + case V4L2_CTRL_WHICH_DEF_VAL:
> + case V4L2_CTRL_WHICH_MIN_VAL:
> + case V4L2_CTRL_WHICH_MAX_VAL:
> for (i = 0; i < ctrls->count; ++ctrl, ++i) {
> - ret = uvc_ctrl_get_fixed(chain, ctrl);
> + ret = uvc_ctrl_get_fixed(chain, ctrl, ctrls->which);
> if (ret < 0) {
> ctrls->error_idx = i;
> return ret;
> }
> }
> -
> return 0;
> +
> + default:
> + break;
> }
>
> ret = uvc_ctrl_begin(chain);
> diff --git a/drivers/media/usb/uvc/uvcvideo.h b/drivers/media/usb/uvc/uvcvideo.h
> index 9ff95bbad251..54cc47bc2d33 100644
> --- a/drivers/media/usb/uvc/uvcvideo.h
> +++ b/drivers/media/usb/uvc/uvcvideo.h
> @@ -913,7 +913,8 @@ static inline int uvc_ctrl_rollback(struct uvc_fh *handle)
>
> int uvc_ctrl_get(struct uvc_video_chain *chain, struct v4l2_ext_control *xctrl);
> int uvc_ctrl_get_fixed(struct uvc_video_chain *chain,
> - struct v4l2_ext_control *xctrl);
> + struct v4l2_ext_control *xctrl,
> + u32 v4l2_which);
> int uvc_ctrl_set(struct uvc_fh *handle, struct v4l2_ext_control *xctrl);
> int uvc_ctrl_is_accessible(struct uvc_video_chain *chain, u32 v4l2_id,
> bool read);
> --
> 2.37.0.rc0.161.g10f37bed90-goog
>

--
Ricardo Ribalda