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SubjectRe: [PATCH 17/31] media: au0828 video change to use v4l_enable_media_tuner()
Em Wed,  6 Jan 2016 13:27:06 -0700
Shuah Khan <shuahkh@osg.samsung.com> escreveu:

> au0828 is changed to use v4l_enable_media_tuner() to check for
> tuner availability from vidioc_g_tuner(), and au0828_v4l2_close(),
> before changing tuner settings. If tuner isn't free, return busy
> condition from vidioc_g_tuner() and in au0828_v4l2_close() tuner
> is left untouched without powering down to save energy.

Did you test the code when the input is not a tuner, but, instead,
Composite or S-Video connector, as shown at:
https://mchehab.fedorapeople.org/mc-next-gen/au0828.png

I guess calling it v4l-enable_media_tuner() is not right, specially
since there are hybrid devices that have DTV (via DVB API) and
S-Video and/or Composite/RCA capture via V4L2 API.

>
> Signed-off-by: Shuah Khan <shuahkh@osg.samsung.com>
> ---
> drivers/media/usb/au0828/au0828-video.c | 14 ++++++++++++--
> 1 file changed, 12 insertions(+), 2 deletions(-)
>
> diff --git a/drivers/media/usb/au0828/au0828-video.c b/drivers/media/usb/au0828/au0828-video.c
> index 32bcc56..ed3ba05 100644
> --- a/drivers/media/usb/au0828/au0828-video.c
> +++ b/drivers/media/usb/au0828/au0828-video.c
> @@ -1010,8 +1010,12 @@ static int au0828_v4l2_close(struct file *filp)
> goto end;
>
> if (dev->users == 1) {
> - /* Save some power by putting tuner to sleep */
> - v4l2_device_call_all(&dev->v4l2_dev, 0, core, s_power, 0);
> + /* Save some power by putting tuner to sleep, if it is free */
> + /* What happens when radio is using tuner?? */
> + ret = v4l_enable_media_tuner(vdev);
> + if (ret == 0)
> + v4l2_device_call_all(&dev->v4l2_dev, 0, core,
> + s_power, 0);
> dev->std_set_in_tuner_core = 0;
>
> /* When close the device, set the usb intf0 into alt0 to free
> @@ -1412,10 +1416,16 @@ static int vidioc_s_audio(struct file *file, void *priv, const struct v4l2_audio
> static int vidioc_g_tuner(struct file *file, void *priv, struct v4l2_tuner *t)
> {
> struct au0828_dev *dev = video_drvdata(file);
> + struct video_device *vfd = video_devdata(file);
> + int ret;
>
> if (t->index != 0)
> return -EINVAL;
>
> + ret = v4l_enable_media_tuner(vfd);
> + if (ret)
> + return ret;
> +
> dprintk(1, "%s called std_set %d dev_state %d\n", __func__,
> dev->std_set_in_tuner_core, dev->dev_state);
>

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