diff mbox series

[v11,08/11] media: uvcvideo: support V4L2_CTRL_WHICH_MIN/MAX_VAL

Message ID 20230426082923.132909-9-yunkec@google.com
State New
Headers show
Series media: Implement UVC v1.5 ROI | expand

Commit Message

Yunke Cao April 26, 2023, 8:29 a.m. UTC 
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 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 | 44 ++++++++++++++++++++++++++++----
 drivers/media/usb/uvc/uvc_v4l2.c |  7 +++--
 drivers/media/usb/uvc/uvcvideo.h |  3 ++-
 3 files changed, 46 insertions(+), 8 deletions(-)
diff mbox series

Patch

diff --git a/drivers/media/usb/uvc/uvc_ctrl.c b/drivers/media/usb/uvc/uvc_ctrl.c
index 8f0401230649..109369ec2c42 100644
--- a/drivers/media/usb/uvc/uvc_ctrl.c
+++ b/drivers/media/usb/uvc/uvc_ctrl.c
@@ -1978,6 +1978,7 @@  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 };
@@ -1987,28 +1988,59 @@  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 -EACCES;
+
 	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;
@@ -2025,9 +2057,11 @@  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 77704bd21e5c..2aeb92e8621f 100644
--- a/drivers/media/usb/uvc/uvc_v4l2.c
+++ b/drivers/media/usb/uvc/uvc_v4l2.c
@@ -1093,9 +1093,12 @@  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 8d36a3f8c52e..69aba8873f65 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,