em28xx: fix audio VIDIOC_S_CTRL adjustments on devices without ac97

From: Mauro Carvalho Chehab <mchehab@redhat.com>

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.

Priority: normal

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

1 files changed, 18 insertions, 1 deletions

diff --git a/linux/drivers/media/video/em28xx/em28xx-video.c b/linux/drivers/media/video/em28xx/em28xx-video.c
index 1237e325d..8cb8674c9 100644
--- a/linux/drivers/media/video/em28xx/em28xx-video.c
+++ b/linux/drivers/media/video/em28xx/em28xx-video.c
@@ -1123,9 +1123,26 @@ 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);
+
+		/*
+		 * 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;
+			return em28xx_audio_analog_set(dev);
+			break;
+		case V4L2_CID_AUDIO_VOLUME:
+			dev->volume = ctrl->value;
+			return em28xx_audio_analog_set(dev);
+		}
+
 		/* FIXME: should be returning a meaninful value */
 		rc = 0;
 	}