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    Subject[PATCH 17/31] media: au0828 video change to use v4l_enable_media_tuner()
    Date
    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.

    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);

    --
    2.5.0


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