[PATCH v14 08/11] media: uvcvideo: support V4L2_CTRL_WHICH_MIN/MAX_VAL

Yunke Cao
2023-12-01T07:19:53Z

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.

Reviewed-by: Ricardo Ribalda <ribalda@chromium.org>
Reviewed-by: Sergey Senozhatsky <senozhatsky@chromium.org>
Signed-off-by: Yunke Cao <yunkec@google.com>
---
Changelog since v11:
- No change.
Changelog since v10:
- Added Reviewed-by from Sergey.
Changelog since v9:
- Revert a change in v7 that causes v4l2-compliance failure:
- In uvc_ioctl_g_ext_ctrls(), when v4l2_which is not V4L2_CTRL_WHICH_*_VAL,
- treat it the same as cur instead of returning EINVAL. This is the existing
- behavior.
- The change in v7 of returning EINVAL fails the check in
- v4l2-compliance/v4l2-test-controls.cpp#L834.
Changelog since v8:
- No change.
Changelog since v7:
- Address some comments.

drivers/media/usb/uvc/uvc_ctrl.c | 64 +++++++++++++++++++++++++++-----
drivers/media/usb/uvc/uvc_v4l2.c | 7 +++-
drivers/media/usb/uvc/uvcvideo.h | 3 +-
3 files changed, 61 insertions(+), 13 deletions(-)

diff --git a/drivers/media/usb/uvc/uvc_ctrl.c b/drivers/media/usb/uvc/uvc_ctrl.c
index aae2480496b7..c073c2a02102 100644
--- a/drivers/media/usb/uvc/uvc_ctrl.c
+++ b/drivers/media/usb/uvc/uvc_ctrl.c
@@ -1247,11 +1247,18 @@ int uvc_ctrl_is_accessible(struct uvc_video_chain *chain, u32 v4l2_id,
if (!ctrl)
return -EINVAL;

- if (!(ctrl->info.flags & UVC_CTRL_FLAG_GET_CUR) && read)
- return -EACCES;
-
- if (!(ctrl->info.flags & UVC_CTRL_FLAG_SET_CUR) && !read)
- return -EACCES;
+ if (read) {
+ if (ctrls->which == V4L2_CTRL_WHICH_MIN_VAL ||
+ ctrls->which == V4L2_CTRL_WHICH_MAX_VAL) {
+ if (!(ctrl->info.flags & UVC_CTRL_FLAG_GET_MIN) ||
+ !(ctrl->info.flags & UVC_CTRL_FLAG_GET_MAX))
+ return -EINVAL;
+ } else if (!(ctrl->info.flags & UVC_CTRL_FLAG_GET_CUR))
+ return -EACCES;
+ } else {
+ if (!(ctrl->info.flags & UVC_CTRL_FLAG_SET_CUR))
+ return -EACCES;
+ }

if (ioctl != VIDIOC_S_EXT_CTRLS || !mapping->master_id)
return 0;
@@ -1332,6 +1339,9 @@ static int __uvc_query_v4l2_ctrl(struct uvc_video_chain *chain,
v4l2_ctrl->flags |= V4L2_CTRL_FLAG_WRITE_ONLY;
if (!(ctrl->info.flags & UVC_CTRL_FLAG_SET_CUR))
v4l2_ctrl->flags |= V4L2_CTRL_FLAG_READ_ONLY;
+ if ((ctrl->info.flags & UVC_CTRL_FLAG_GET_MAX) &&
+ (ctrl->info.flags & UVC_CTRL_FLAG_GET_MIN))
+ v4l2_ctrl->flags |= V4L2_CTRL_FLAG_HAS_WHICH_MIN_MAX;

if (mapping->master_id)
__uvc_find_control(ctrl->entity, mapping->master_id,
@@ -1981,6 +1991,7 @@ int uvc_ctrl_get(struct uvc_video_chain *chain,
static 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 };
@@ -1990,28 +2001,59 @@ static 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;

+ 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 -EINVAL;
+
if (!ctrl->cached) {
ret = uvc_ctrl_populate_cache(chain, ctrl);
if (ret < 0)
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;
@@ -2028,9 +2070,11 @@ 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 ff72caf7bc9e..352f62ef02f2 100644
--- a/drivers/media/usb/uvc/uvc_v4l2.c
+++ b/drivers/media/usb/uvc/uvc_v4l2.c
@@ -1094,9 +1094,12 @@ 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;
diff --git a/drivers/media/usb/uvc/uvcvideo.h b/drivers/media/usb/uvc/uvcvideo.h
index 11805b729c22..6fda40919e7f 100644
--- a/drivers/media/usb/uvc/uvcvideo.h
+++ b/drivers/media/usb/uvc/uvcvideo.h
@@ -790,7 +790,8 @@ 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,
const struct v4l2_ext_controls *ctrls,
--
2.43.0.rc2.451.g8631bc7472-goog