ALSA: asihpi - Add volume mute controls

Mute functionality was recently added to the DSP firmware
Signed-off-by: Eliot Blennerhassett <eblennerhassett@audioscience.com>
Signed-off-by: Takashi Iwai <tiwai@suse.de>

sound/pci/asihpi/asihpi.c

@@ -1487,11 +1487,48 @@ static int snd_asihpi_volume_put(struct snd_kcontrol *kcontrol,
 
 static const DECLARE_TLV_DB_SCALE(db_scale_100, -10000, VOL_STEP_mB, 0);
 
+static int snd_asihpi_volume_mute_info(struct snd_kcontrol *kcontrol,
+				  struct snd_ctl_elem_info *uinfo)
+{
+	uinfo->type = SNDRV_CTL_ELEM_TYPE_BOOLEAN;
+	uinfo->count = 1;
+	uinfo->value.integer.min = 0;
+	uinfo->value.integer.max = 1;
+	return 0;
+}
+
+static int snd_asihpi_volume_mute_get(struct snd_kcontrol *kcontrol,
+				 struct snd_ctl_elem_value *ucontrol)
+{
+	u32 h_control = kcontrol->private_value;
+	u32 mute;
+
+	hpi_handle_error(hpi_volume_get_mute(h_control, &mute));
+	ucontrol->value.integer.value[0] = mute ? 0 : 1;
+
+	return 0;
+}
+
+static int snd_asihpi_volume_mute_put(struct snd_kcontrol *kcontrol,
+				 struct snd_ctl_elem_value *ucontrol)
+{
+	u32 h_control = kcontrol->private_value;
+	int change = 1;
+	/* HPI currently only supports all or none muting of multichannel volume
+	ALSA Switch element has opposite sense to HPI mute: on==unmuted, off=muted
+	*/
+	int mute =  ucontrol->value.integer.value[0] ? 0 : HPI_BITMASK_ALL_CHANNELS;
+	hpi_handle_error(hpi_volume_set_mute(h_control, mute));
+	return change;
+}
+
 static int __devinit snd_asihpi_volume_add(struct snd_card_asihpi *asihpi,
 					struct hpi_control *hpi_ctl)
 {
 	struct snd_card *card = asihpi->card;
 	struct snd_kcontrol_new snd_control;
+	int err;
+	u32 mute;
 
 	asihpi_ctl_init(&snd_control, hpi_ctl, "Volume");
 	snd_control.access = SNDRV_CTL_ELEM_ACCESS_READWRITE |
@@ -1501,7 +1538,19 @@ static int __devinit snd_asihpi_volume_add(struct snd_card_asihpi *asihpi,
 	snd_control.put = snd_asihpi_volume_put;
 	snd_control.tlv.p = db_scale_100;
 
-	return ctl_add(card, &snd_control, asihpi);
+	err = ctl_add(card, &snd_control, asihpi);
+	if (err)
+		return err;
+
+	if (hpi_volume_get_mute(hpi_ctl->h_control, &mute) == 0) {
+		asihpi_ctl_init(&snd_control, hpi_ctl, "Switch");
+		snd_control.access = SNDRV_CTL_ELEM_ACCESS_READWRITE;
+		snd_control.info = snd_asihpi_volume_mute_info;
+		snd_control.get = snd_asihpi_volume_mute_get;
+		snd_control.put = snd_asihpi_volume_mute_put;
+		err = ctl_add(card, &snd_control, asihpi);
+	}
+	return err;
 }
 
 /*------------------------------------------------------------