V4L/DVB (9670): em28xx: allow specifying audio output

Some boards use different AC97 setups for output. This patch adds the
capability of specifying the output to be used. Currently, only one
output is selected, but the better is to allow user to select it via a
mixer, on alsa driver.
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>

drivers/media/video/em28xx/em28xx-core.c

@@ -388,9 +388,17 @@ static int em28xx_set_audio_source(struct em28xx *dev)
 	return ret;
 }
 
+static int outputs[] = {
+	[EM28XX_AOUT_MASTER] = AC97_MASTER_VOL,
+	[EM28XX_AOUT_LINE]   = AC97_LINE_LEVEL_VOL,
+	[EM28XX_AOUT_MONO]   = AC97_MASTER_MONO_VOL,
+	[EM28XX_AOUT_LFE]    = AC97_LFE_MASTER_VOL,
+	[EM28XX_AOUT_SURR]   = AC97_SURR_MASTER_VOL,
+};
+
 int em28xx_audio_analog_set(struct em28xx *dev)
 {
-	int ret;
+	int ret, i;
 	u8 xclk = 0x07;
 
 	if (!dev->audio_mode.has_audio)
@@ -400,11 +408,13 @@ int em28xx_audio_analog_set(struct em28xx *dev)
 	   It would be possible to use also line output.
 	 */
 	if (dev->audio_mode.ac97 != EM28XX_NO_AC97) {
-		/* Mute */
-		ret = em28xx_write_ac97(dev, AC97_MASTER_VOL, 0x8000);
-
-		if (ret < 0)
-			return ret;
+		/* Mute all outputs */
+		for (i = 0; i < ARRAY_SIZE(outputs); i++) {
+			ret = em28xx_write_ac97(dev, outputs[i], 0x8000);
+			if (ret < 0)
+				em28xx_warn("couldn't setup AC97 register %d\n",
+				     outputs[i]);
+		}
 	}
 
 	if (dev->has_12mhz_i2s)
@@ -433,7 +443,7 @@ int em28xx_audio_analog_set(struct em28xx *dev)
 			vol |= 0x8000;
 
 		/* Sets volume */
-		ret = em28xx_write_ac97(dev, AC97_MASTER_VOL, vol);
+		ret = em28xx_write_ac97(dev, outputs[dev->ctl_aoutput], vol);
 	}
 
 	return ret;

drivers/media/video/em28xx/em28xx-video.c

@@ -566,6 +566,7 @@ static void video_mux(struct em28xx *dev, int index)
 	route.output = 0;
 	dev->ctl_input = index;
 	dev->ctl_ainput = INPUT(index)->amux;
+	dev->ctl_aoutput = INPUT(index)->aout;
 
 	em28xx_i2c_call_clients(dev, VIDIOC_INT_S_VIDEO_ROUTING, &route);
 
@@ -928,20 +929,38 @@ static int vidioc_g_audio(struct file *file, void *priv, struct v4l2_audio *a)
 {
 	struct em28xx_fh   *fh    = priv;
 	struct em28xx      *dev   = fh->dev;
-	unsigned int        index = a->index;
 
-	if (a->index > 1)
-		return -EINVAL;
-
-	index = dev->ctl_ainput;
-
-	if (index == 0)
+	switch (a->index) {
+	case EM28XX_AMUX_VIDEO:
 		strcpy(a->name, "Television");
-	else
+		break;
+	case EM28XX_AMUX_LINE_IN:
 		strcpy(a->name, "Line In");
+		break;
+	case EM28XX_AMUX_VIDEO2:
+		strcpy(a->name, "Television alt");
+		break;
+	case EM28XX_AMUX_PHONE:
+		strcpy(a->name, "Phone");
+		break;
+	case EM28XX_AMUX_MIC:
+		strcpy(a->name, "Mic");
+		break;
+	case EM28XX_AMUX_CD:
+		strcpy(a->name, "CD");
+		break;
+	case EM28XX_AMUX_AUX:
+		strcpy(a->name, "Aux");
+		break;
+	case EM28XX_AMUX_PCM_OUT:
+		strcpy(a->name, "PCM");
+		break;
+	default:
+		return -EINVAL;
+	}
 
+	a->index = dev->ctl_ainput;
 	a->capability = V4L2_AUDCAP_STEREO;
-	a->index = index;
 
 	return 0;
 }
@@ -951,9 +970,8 @@ static int vidioc_s_audio(struct file *file, void *priv, struct v4l2_audio *a)
 	struct em28xx_fh   *fh  = priv;
 	struct em28xx      *dev = fh->dev;
 
-	if (a->index != dev->ctl_ainput)
-		return -EINVAL;
-
+	dev->ctl_ainput = INPUT(a->index)->amux;
+	dev->ctl_aoutput = INPUT(a->index)->aout;
 	return 0;
 }
 

drivers/media/video/em28xx/em28xx.h

@@ -295,10 +295,19 @@ enum em28xx_amux {
 	EM28XX_AMUX_PCM_OUT,
 };
 
+enum em28xx_aout {
+	EM28XX_AOUT_MASTER = 0,	/* should be the default */
+	EM28XX_AOUT_LINE,
+	EM28XX_AOUT_MONO,
+	EM28XX_AOUT_LFE,
+	EM28XX_AOUT_SURR,
+};
+
 struct em28xx_input {
 	enum enum28xx_itype type;
 	unsigned int vmux;
 	enum em28xx_amux amux;
+	enum em28xx_aout aout;
 };
 
 #define INPUT(nr) (&em28xx_boards[dev->model].input[nr])
@@ -450,6 +459,7 @@ struct em28xx {
 	int ctl_freq;		/* selected frequency */
 	unsigned int ctl_input;	/* selected input */
 	unsigned int ctl_ainput;/* selected audio input */
+	unsigned int ctl_aoutput;/* selected audio output */
 	int mute;
 	int volume;
 	/* frame properties */