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Subject[PATCHv2 3/3] media: uvcvideo: add UVC 1.5 ROI control
Date
From: Sergey Senozhatsky <senozhatsky@chromium.org>

This patch implements parts of UVC 1.5 Region of Interest (ROI)
control, using the uvcvideo selection API.

There are several things to mention here.

First, UVC 1.5 defines CT_DIGITAL_WINDOW_CONTROL; and ROI rectangle
coordinates "must be within the current Digital Window as specified
by the CT_WINDOW control." (4.2.2.1.20 Digital Region of Interest
(ROI) Control.) This is not entirely clear if we need to implement
CT_DIGITAL_WINDOW_CONTROL. ROI is naturally limited by: ROI GET_MIN
and GET_MAX rectangles. Besides, the H/W that I'm playing with
implements ROI, but doesn't implement CT_DIGITAL_WINDOW_CONTROL,
so WINDOW_CONTROL is probably optional.

Second, the patch doesn't implement all of the ROI requests.
Namely, SEL_TGT_BOUNDS for ROI implements GET_MAX (that is maximal
ROI rectangle area). GET_MIN is not implemented (as of now) since
it's not very clear if user space would need such information.

Signed-off-by: Sergey Senozhatsky <senozhatsky@chromium.org>
---
drivers/media/usb/uvc/uvc_v4l2.c | 143 ++++++++++++++++++++++++++++++-
1 file changed, 140 insertions(+), 3 deletions(-)

diff --git a/drivers/media/usb/uvc/uvc_v4l2.c b/drivers/media/usb/uvc/uvc_v4l2.c
index 252136cc885c..71b4577196e5 100644
--- a/drivers/media/usb/uvc/uvc_v4l2.c
+++ b/drivers/media/usb/uvc/uvc_v4l2.c
@@ -1139,14 +1139,60 @@ static int uvc_ioctl_querymenu(struct file *file, void *fh,
return uvc_query_v4l2_menu(chain, qm);
}

-static int uvc_ioctl_g_selection(struct file *file, void *fh,
- struct v4l2_selection *sel)
+/* UVC 1.5 ROI rectangle is half the size of v4l2_rect */
+struct uvc_roi_rect {
+ __u16 top;
+ __u16 left;
+ __u16 bottom;
+ __u16 right;
+};
+
+static int uvc_ioctl_g_roi_target(struct file *file, void *fh,
+ struct v4l2_selection *sel)
{
struct uvc_fh *handle = fh;
struct uvc_streaming *stream = handle->stream;
+ struct uvc_roi_rect *roi;
+ u8 query;
+ int ret;

- if (sel->type != stream->type)
+ switch (sel->target) {
+ case V4L2_SEL_TGT_ROI_DEFAULT:
+ query = UVC_GET_DEF;
+ break;
+ case V4L2_SEL_TGT_ROI_CURRENT:
+ query = UVC_GET_CUR;
+ break;
+ case V4L2_SEL_TGT_ROI_BOUNDS:
+ query = UVC_GET_MAX;
+ break;
+ default:
return -EINVAL;
+ }
+
+ roi = kzalloc(sizeof(struct uvc_roi_rect), GFP_KERNEL);
+ if (!roi)
+ return -ENOMEM;
+
+ ret = uvc_query_ctrl(stream->dev, query, 1, stream->dev->intfnum,
+ UVC_CT_REGION_OF_INTEREST_CONTROL, roi,
+ sizeof(struct uvc_roi_rect));
+ if (!ret) {
+ sel->r.left = roi->left;
+ sel->r.top = roi->top;
+ sel->r.width = roi->right;
+ sel->r.height = roi->bottom;
+ }
+
+ kfree(roi);
+ return ret;
+}
+
+static int uvc_ioctl_g_sel_target(struct file *file, void *fh,
+ struct v4l2_selection *sel)
+{
+ struct uvc_fh *handle = fh;
+ struct uvc_streaming *stream = handle->stream;

switch (sel->target) {
case V4L2_SEL_TGT_CROP_DEFAULT:
@@ -1173,6 +1219,96 @@ static int uvc_ioctl_g_selection(struct file *file, void *fh,
return 0;
}

+static int uvc_ioctl_g_selection(struct file *file, void *fh,
+ struct v4l2_selection *sel)
+{
+ struct uvc_fh *handle = fh;
+ struct uvc_streaming *stream = handle->stream;
+
+ if (sel->type != stream->type)
+ return -EINVAL;
+
+ switch (sel->target) {
+ case V4L2_SEL_TGT_CROP_DEFAULT:
+ case V4L2_SEL_TGT_CROP_BOUNDS:
+ case V4L2_SEL_TGT_COMPOSE_DEFAULT:
+ case V4L2_SEL_TGT_COMPOSE_BOUNDS:
+ return uvc_ioctl_g_sel_target(file, fh, sel);
+ case V4L2_SEL_TGT_ROI_CURRENT:
+ case V4L2_SEL_TGT_ROI_DEFAULT:
+ case V4L2_SEL_TGT_ROI_BOUNDS:
+ return uvc_ioctl_g_roi_target(file, fh, sel);
+ }
+
+ return -EINVAL;
+}
+
+static bool validate_roi_bounds(struct uvc_streaming *stream,
+ struct v4l2_selection *sel)
+{
+ bool ok = true;
+
+ if (sel->r.left > USHRT_MAX || sel->r.top > USHRT_MAX ||
+ sel->r.width > USHRT_MAX || sel->r.height > USHRT_MAX)
+ return false;
+
+ /* perhaps also can test against ROI GET_MAX */
+
+ mutex_lock(&stream->mutex);
+ if ((u16)sel->r.width > stream->cur_frame->wWidth)
+ ok = false;
+ if ((u16)sel->r.height > stream->cur_frame->wHeight)
+ ok = false;
+ mutex_unlock(&stream->mutex);
+
+ return ok;
+}
+
+static int uvc_ioctl_s_roi(struct file *file, void *fh,
+ struct v4l2_selection *sel)
+{
+ struct uvc_fh *handle = fh;
+ struct uvc_streaming *stream = handle->stream;
+ struct uvc_roi_rect *roi;
+ int ret;
+
+ if (!validate_roi_bounds(stream, sel))
+ return -E2BIG;
+
+ roi = kzalloc(sizeof(struct uvc_roi_rect), GFP_KERNEL);
+ if (!roi)
+ return -ENOMEM;
+
+ roi->left = sel->r.left;
+ roi->top = sel->r.top;
+ roi->right = sel->r.width;
+ roi->bottom = sel->r.height;
+
+ ret = uvc_query_ctrl(stream->dev, UVC_SET_CUR, 1, stream->dev->intfnum,
+ UVC_CT_REGION_OF_INTEREST_CONTROL, roi,
+ sizeof(struct uvc_roi_rect));
+
+ kfree(roi);
+ return ret;
+}
+
+static int uvc_ioctl_s_selection(struct file *file, void *fh,
+ struct v4l2_selection *sel)
+{
+ struct uvc_fh *handle = fh;
+ struct uvc_streaming *stream = handle->stream;
+
+ if (sel->type != stream->type)
+ return -EINVAL;
+
+ switch (sel->target) {
+ case V4L2_SEL_TGT_ROI:
+ return uvc_ioctl_s_roi(file, fh, sel);
+ }
+
+ return -EINVAL;
+}
+
static int uvc_ioctl_g_parm(struct file *file, void *fh,
struct v4l2_streamparm *parm)
{
@@ -1533,6 +1669,7 @@ const struct v4l2_ioctl_ops uvc_ioctl_ops = {
.vidioc_try_ext_ctrls = uvc_ioctl_try_ext_ctrls,
.vidioc_querymenu = uvc_ioctl_querymenu,
.vidioc_g_selection = uvc_ioctl_g_selection,
+ .vidioc_s_selection = uvc_ioctl_s_selection,
.vidioc_g_parm = uvc_ioctl_g_parm,
.vidioc_s_parm = uvc_ioctl_s_parm,
.vidioc_enum_framesizes = uvc_ioctl_enum_framesizes,
--
2.30.0
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