Hi Ricardo,
Thank you for the patch.
On Friday 12 June 2015 18:46:23 Ricardo Ribalda Delgado wrote:
> 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.riba...@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);
There's no need to call uvc_ctrl_begin() here (and if there was, you'd have to
call uvc_ctrl_rollback() or uvc_ctrl_commit() before returning).
> + 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;
> +}
Instead of open-coding this in multiple drivers, how about adding a helper
function to the core ? Something like (totally untested)
int v4l2_ioctl_g_def_ext_ctrls(struct file *file, void *fh,
struct v4l2_ext_controls *ctrls)
{
struct video_device *vdev = video_devdata(file);
unsigned int i;
int ret;
for (i = 0; i < ctrls->count; ++i) {
struct v4l2_queryctrl qc;
qc.id = ctrl->id;
ret = vdev->ioctl_ops->vidioc_queryctrl(file, fh, &qc);
if (ret < 0) {
ctrls->error_idx = i;
return ret;
}
ctrls->controls[i].value = qc.default_value;
}
ctrls->error_idx = 0;
return 0;
}
The function could be called by v4l_g_def_ext_ctrls() when ops-
>vidioc_g_def_ext_ctrls is NULL.
> 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,
--
Regards,
Laurent Pinchart
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