V4L/DVB (6185): cx88-alsa: Add mute controls, change control names

Add two mute controls.  One mutes everything, the other just mutes the analog
pass-through output.

Rename the existing volume control.  The controls are now:
Playback Volume
Playback Switch
Capture Switch

These names might seem odd, but I believe they are more correct.  The previous
"Capture Volume" control didn't actually effect the volume of the captured
audio.  Instead it controls the volume of the analog pass-thought output.  It
appears that pass-through controls like this are usually considered to be in
the playback direction, not capture.  For example, "CAPTURE feedback Playback
Volume" is the name used for a control that appears to have the same effect in
the ca0106 driver.  We only have one volume control, so we can omit the
"CAPTURE feedback" part.

If someone where to add PCM playback support to the driver, then this would be
the volume control.
Signed-off-by: NTrent Piepho <xyzzy@speakeasy.org>
Signed-off-by: NMauro Carvalho Chehab <mchehab@infradead.org>

drivers/media/video/cx88/cx88-alsa.c

@@ -82,6 +82,7 @@ typedef struct cx88_audio_dev snd_cx88_card_t;
 
 
 
+
 /****************************************************************************
 			Module global static vars
  ****************************************************************************/
@@ -545,8 +546,8 @@ static int __devinit snd_cx88_pcm(snd_cx88_card_t *chip, int device, char *name)
 /****************************************************************************
 				CONTROL INTERFACE
  ****************************************************************************/
-static int snd_cx88_capture_volume_info(struct snd_kcontrol *kcontrol,
-					struct snd_ctl_elem_info *info)
+static int snd_cx88_volume_info(struct snd_kcontrol *kcontrol,
+				struct snd_ctl_elem_info *info)
 {
 	info->type = SNDRV_CTL_ELEM_TYPE_INTEGER;
 	info->count = 2;
@@ -556,9 +557,8 @@ static int snd_cx88_capture_volume_info(struct snd_kcontrol *kcontrol,
 	return 0;
 }
 
-/* OK - TODO: test it */
-static int snd_cx88_capture_volume_get(struct snd_kcontrol *kcontrol,
-				       struct snd_ctl_elem_value *value)
+static int snd_cx88_volume_get(struct snd_kcontrol *kcontrol,
+			       struct snd_ctl_elem_value *value)
 {
 	snd_cx88_card_t *chip = snd_kcontrol_chip(kcontrol);
 	struct cx88_core *core=chip->core;
@@ -573,8 +573,8 @@ static int snd_cx88_capture_volume_get(struct snd_kcontrol *kcontrol,
 }
 
 /* OK - TODO: test it */
-static int snd_cx88_capture_volume_put(struct snd_kcontrol *kcontrol,
-				       struct snd_ctl_elem_value *value)
+static int snd_cx88_volume_put(struct snd_kcontrol *kcontrol,
+			       struct snd_ctl_elem_value *value)
 {
 	snd_cx88_card_t *chip = snd_kcontrol_chip(kcontrol);
 	struct cx88_core *core=chip->core;
@@ -605,14 +605,62 @@ static int snd_cx88_capture_volume_put(struct snd_kcontrol *kcontrol,
 	return changed;
 }
 
-static struct snd_kcontrol_new snd_cx88_capture_volume = {
+static struct snd_kcontrol_new snd_cx88_volume = {
 	.iface = SNDRV_CTL_ELEM_IFACE_MIXER,
-	.name = "Capture Volume",
-	.info = snd_cx88_capture_volume_info,
-	.get = snd_cx88_capture_volume_get,
-	.put = snd_cx88_capture_volume_put,
+	.name = "Playback Volume",
+	.info = snd_cx88_volume_info,
+	.get = snd_cx88_volume_get,
+	.put = snd_cx88_volume_put,
 };
 
+static int snd_cx88_switch_get(struct snd_kcontrol *kcontrol,
+			       struct snd_ctl_elem_value *value)
+{
+	snd_cx88_card_t *chip = snd_kcontrol_chip(kcontrol);
+	struct cx88_core *core = chip->core;
+	u32 bit = kcontrol->private_value;
+
+	value->value.integer.value[0] = !(cx_read(AUD_VOL_CTL) & bit);
+	return 0;
+}
+
+static int snd_cx88_switch_put(struct snd_kcontrol *kcontrol,
+				       struct snd_ctl_elem_value *value)
+{
+	snd_cx88_card_t *chip = snd_kcontrol_chip(kcontrol);
+	struct cx88_core *core = chip->core;
+	u32 bit = kcontrol->private_value;
+	int ret = 0;
+	u32 vol;
+
+	spin_lock_irq(&chip->reg_lock);
+	vol = cx_read(AUD_VOL_CTL);
+	if (value->value.integer.value[0] != !(vol & bit)) {
+		vol ^= bit;
+		cx_write(AUD_VOL_CTL, vol);
+		ret = 1;
+	}
+	spin_unlock_irq(&chip->reg_lock);
+	return ret;
+}
+
+static struct snd_kcontrol_new snd_cx88_dac_switch = {
+	.iface = SNDRV_CTL_ELEM_IFACE_MIXER,
+	.name = "Playback Switch",
+	.info = snd_ctl_boolean_mono_info,
+	.get = snd_cx88_switch_get,
+	.put = snd_cx88_switch_put,
+	.private_value = (1<<8),
+};
+
+static struct snd_kcontrol_new snd_cx88_source_switch = {
+	.iface = SNDRV_CTL_ELEM_IFACE_MIXER,
+	.name = "Capture Switch",
+	.info = snd_ctl_boolean_mono_info,
+	.get = snd_cx88_switch_get,
+	.put = snd_cx88_switch_put,
+	.private_value = (1<<6),
+};
 
 /****************************************************************************
 			Basic Flow for Sound Devices
@@ -762,7 +810,13 @@ static int __devinit cx88_audio_initdev(struct pci_dev *pci,
 	if (err < 0)
 		goto error;
 
-	err = snd_ctl_add(card, snd_ctl_new1(&snd_cx88_capture_volume, chip));
+	err = snd_ctl_add(card, snd_ctl_new1(&snd_cx88_volume, chip));
+	if (err < 0)
+		goto error;
+	err = snd_ctl_add(card, snd_ctl_new1(&snd_cx88_dac_switch, chip));
+	if (err < 0)
+		goto error;
+	err = snd_ctl_add(card, snd_ctl_new1(&snd_cx88_source_switch, chip));
 	if (err < 0)
 		goto error;