V4L/DVB (12345): em28xx: fix audio VIDIOC_S_CTRL adjustments on devices without ac97

Even devices without ac97 needs to call analog audio setup function, to
properly set xclk and mute/unmute.

Thanks to Angelo Cano <acano@fastmail.fm> for reporting and testing it.

Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>

1 files changed, 17 insertions, 3 deletions

diff --git a/drivers/media/video/em28xx/em28xx-video.c b/drivers/media/video/em28xx/em28xx-video.c
index 7ed3051554c1..477b9b67eaeb 100644
--- a/drivers/media/video/em28xx/em28xx-video.c
+++ b/drivers/media/video/em28xx/em28xx-video.c
@@ -1146,11 +1146,25 @@ static int vidioc_s_ctrl(struct file *file, void *priv,
         else
                 rc = 1;
 
-        /* It were not an AC97 control. Sends it to the v4l2 dev interface */
+        /* It isn't an AC97 control. Sends it to the v4l2 dev interface */
         if (rc == 1) {
                 v4l2_device_call_all(&dev->v4l2_dev, 0, core, s_ctrl, ctrl);
-                /* FIXME: should be returning a meaninful value */
-                rc = 0;
+
+                /*
+                 * In the case of non-AC97 volume controls, we still need
+                 * to do some setups at em28xx, in order to mute/unmute
+                 * and to adjust audio volume. However, the value ranges
+                 * should be checked by the corresponding V4L subdriver.
+                 */
+                switch (ctrl->id) {
+                case V4L2_CID_AUDIO_MUTE:
+                        dev->mute = ctrl->value;
+                        rc = em28xx_audio_analog_set(dev);
+                        break;
+                case V4L2_CID_AUDIO_VOLUME:
+                        dev->volume = ctrl->value;
+                        rc = em28xx_audio_analog_set(dev);
+                }
         }
 
         mutex_unlock(&dev->lock);