[RFC v3 04/19] media/usb/uvc: Implement vivioc_g_def_ext_ctrls

Ricardo Ribalda Delgado
2015-06-12T16:46:23Z

Callback needed by ioctl VIDIOC_G_DEF_EXT_CTRLS as this driver does not
use the controller framework.

Signed-off-by: Ricardo Ribalda Delgado <ricardo.ribalda@gmail.com>
---
drivers/media/usb/uvc/uvc_v4l2.c | 30 ++++++++++++++++++++++++++++++
1 file changed, 30 insertions(+)

diff --git a/drivers/media/usb/uvc/uvc_v4l2.c b/drivers/media/usb/uvc/uvc_v4l2.c
index 2764f43607c1..e2698a77138a 100644
--- a/drivers/media/usb/uvc/uvc_v4l2.c
+++ b/drivers/media/usb/uvc/uvc_v4l2.c
@@ -1001,6 +1001,35 @@ static int uvc_ioctl_g_ext_ctrls(struct file *file, void *fh,
return uvc_ctrl_rollback(handle);
}

+static int uvc_ioctl_g_def_ext_ctrls(struct file *file, void *fh,
+ struct v4l2_ext_controls *ctrls)
+{
+ struct uvc_fh *handle = fh;
+ struct uvc_video_chain *chain = handle->chain;
+ struct v4l2_ext_control *ctrl = ctrls->controls;
+ unsigned int i;
+ int ret;
+ struct v4l2_queryctrl qc;
+
+ ret = uvc_ctrl_begin(chain);
+ if (ret < 0)
+ return ret;
+
+ for (i = 0; i < ctrls->count; ++ctrl, ++i) {
+ qc.id = ctrl->id;
+ ret = uvc_query_v4l2_ctrl(chain, &qc);
+ if (ret < 0) {
+ ctrls->error_idx = i;
+ return ret;
+ }
+ ctrl->value = qc.default_value;
+ }
+
+ ctrls->error_idx = 0;
+
+ return 0;
+}
+
static int uvc_ioctl_s_try_ext_ctrls(struct uvc_fh *handle,
struct v4l2_ext_controls *ctrls,
bool commit)
@@ -1500,6 +1529,7 @@ const struct v4l2_ioctl_ops uvc_ioctl_ops = {
.vidioc_g_ctrl = uvc_ioctl_g_ctrl,
.vidioc_s_ctrl = uvc_ioctl_s_ctrl,
.vidioc_g_ext_ctrls = uvc_ioctl_g_ext_ctrls,
+ .vidioc_g_def_ext_ctrls = uvc_ioctl_g_def_ext_ctrls,
.vidioc_s_ext_ctrls = uvc_ioctl_s_ext_ctrls,
.vidioc_try_ext_ctrls = uvc_ioctl_try_ext_ctrls,
.vidioc_querymenu = uvc_ioctl_querymenu,
--
2.1.4