[PATCH v9 10/11] media: uvcvideo: support V4L2_CTRL_WHICH_MIN/MAX_VAL

Yunke Cao
2022-10-25T05:56:30Z

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>
---
Changelog since v8:
- No change.
Changelog since v7:
- Address some comments.

drivers/media/usb/uvc/uvc_ctrl.c | 45 +++++++++++++++++++++++++++-----
drivers/media/usb/uvc/uvc_v4l2.c | 11 ++++++--
drivers/media/usb/uvc/uvcvideo.h | 3 ++-
3 files changed, 49 insertions(+), 10 deletions(-)

diff --git a/drivers/media/usb/uvc/uvc_ctrl.c b/drivers/media/usb/uvc/uvc_ctrl.c
index 33199de7f1be..0713685f8005 100644
--- a/drivers/media/usb/uvc/uvc_ctrl.c
+++ b/drivers/media/usb/uvc/uvc_ctrl.c
@@ -1975,6 +1975,7 @@ int uvc_ctrl_get(struct uvc_video_chain *chain,
int __uvc_ctrl_get_boundary_std(struct uvc_video_chain *chain,
struct uvc_control *ctrl,
struct uvc_control_mapping *mapping,
+ u32 v4l2_which,
struct v4l2_ext_control *xctrl)
{
struct v4l2_queryctrl qc = { .id = xctrl->id };
@@ -1984,19 +1985,47 @@ int __uvc_ctrl_get_boundary_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;
+ }
+
return 0;
}

static int __uvc_ctrl_get_boundary_compound(struct uvc_video_chain *chain,
struct uvc_control *ctrl,
struct uvc_control_mapping *mapping,
+ u32 v4l2_which,
struct v4l2_ext_control *xctrl)
{
+ u32 flag, id;
int ret;

- if (!uvc_ctrl_mapping_is_compound(mapping))
- 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;
+ }
+
+ if (!(ctrl->info.flags & flag) && flag != UVC_CTRL_FLAG_GET_DEF)
+ return -EACCES;

if (!ctrl->cached) {
ret = uvc_ctrl_populate_cache(chain, ctrl);
@@ -2004,11 +2033,11 @@ static int __uvc_ctrl_get_boundary_compound(struct uvc_video_chain *chain,
return ret;
}

- return __uvc_ctrl_get_compound(mapping, ctrl, UVC_CTRL_DATA_DEF, xctrl);
+ return __uvc_ctrl_get_compound(mapping, ctrl, id, xctrl);
}

int uvc_ctrl_get_boundary(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;
@@ -2025,9 +2054,11 @@ int uvc_ctrl_get_boundary(struct uvc_video_chain *chain,

if (uvc_ctrl_mapping_is_compound(mapping))
ret = __uvc_ctrl_get_boundary_compound(chain, ctrl, mapping,
- xctrl);
+ v4l2_which, xctrl);
else
- ret = __uvc_ctrl_get_boundary_std(chain, ctrl, mapping, xctrl);
+ ret = __uvc_ctrl_get_boundary_std(chain, ctrl, mapping,
+ v4l2_which, xctrl);
+

done:
mutex_unlock(&chain->ctrl_mutex);
diff --git a/drivers/media/usb/uvc/uvc_v4l2.c b/drivers/media/usb/uvc/uvc_v4l2.c
index 52a7dc9ad4b9..08060145700a 100644
--- a/drivers/media/usb/uvc/uvc_v4l2.c
+++ b/drivers/media/usb/uvc/uvc_v4l2.c
@@ -1047,9 +1047,12 @@ 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_boundary(chain, ctrl);
+ ret = uvc_ctrl_get_boundary(chain, ctrl, ctrls->which);
if (ret < 0) {
ctrls->error_idx = i;
return ret;
@@ -1057,6 +1060,10 @@ static int uvc_ioctl_g_ext_ctrls(struct file *file, void *fh,
}

return 0;
+ case V4L2_CTRL_WHICH_CUR_VAL:
+ break;
+ default:
+ return -EINVAL;
}

ret = uvc_ctrl_begin(chain);
diff --git a/drivers/media/usb/uvc/uvcvideo.h b/drivers/media/usb/uvc/uvcvideo.h
index c7d20333ca8a..5c3b4ce85615 100644
--- a/drivers/media/usb/uvc/uvcvideo.h
+++ b/drivers/media/usb/uvc/uvcvideo.h
@@ -778,7 +778,8 @@ 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_boundary(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);
--
2.38.0.135.g90850a2211-goog