ALSA: hda - Add "Mute-LED Mode" enum control

Create snd_hda_add_vmaster_hook() and snd_hda_sync_vmaster_hook()
helper functions to handle the mute-LED in vmaster hook more
commonly.  In the former function, a new enum control "Mute-LED Mode"
is added.  This provides user to choose whether the mute-LED should be
turned on/off explicitly or to follow the master-mute status.
Reviewed-by: David Henningsson <david.henningsson@canonical.com>
Signed-off-by: Takashi Iwai <tiwai@suse.de>

sound/pci/hda/hda_codec.c

@@ -2450,6 +2450,100 @@ int __snd_hda_add_vmaster(struct hda_codec *codec, char *name,
 }
 EXPORT_SYMBOL_HDA(__snd_hda_add_vmaster);
 
+/*
+ * mute-LED control using vmaster
+ */
+static int vmaster_mute_mode_info(struct snd_kcontrol *kcontrol,
+				  struct snd_ctl_elem_info *uinfo)
+{
+	static const char * const texts[] = {
+		"Off", "On", "Follow Master"
+	};
+	unsigned int index;
+
+	uinfo->type = SNDRV_CTL_ELEM_TYPE_ENUMERATED;
+	uinfo->count = 1;
+	uinfo->value.enumerated.items = 3;
+	index = uinfo->value.enumerated.item;
+	if (index >= 3)
+		index = 2;
+	strcpy(uinfo->value.enumerated.name, texts[index]);
+	return 0;
+}
+
+static int vmaster_mute_mode_get(struct snd_kcontrol *kcontrol,
+				 struct snd_ctl_elem_value *ucontrol)
+{
+	struct hda_vmaster_mute_hook *hook = snd_kcontrol_chip(kcontrol);
+	ucontrol->value.enumerated.item[0] = hook->mute_mode;
+	return 0;
+}
+
+static int vmaster_mute_mode_put(struct snd_kcontrol *kcontrol,
+				 struct snd_ctl_elem_value *ucontrol)
+{
+	struct hda_vmaster_mute_hook *hook = snd_kcontrol_chip(kcontrol);
+	unsigned int old_mode = hook->mute_mode;
+
+	hook->mute_mode = ucontrol->value.enumerated.item[0];
+	if (hook->mute_mode > HDA_VMUTE_FOLLOW_MASTER)
+		hook->mute_mode = HDA_VMUTE_FOLLOW_MASTER;
+	if (old_mode == hook->mute_mode)
+		return 0;
+	snd_hda_sync_vmaster_hook(hook);
+	return 1;
+}
+
+static struct snd_kcontrol_new vmaster_mute_mode = {
+	.iface = SNDRV_CTL_ELEM_IFACE_MIXER,
+	.name = "Mute-LED Mode",
+	.info = vmaster_mute_mode_info,
+	.get = vmaster_mute_mode_get,
+	.put = vmaster_mute_mode_put,
+};
+
+/*
+ * Add a mute-LED hook with the given vmaster switch kctl
+ * "Mute-LED Mode" control is automatically created and associated with
+ * the given hook.
+ */
+int snd_hda_add_vmaster_hook(struct hda_codec *codec,
+			     struct hda_vmaster_mute_hook *hook)
+{
+	struct snd_kcontrol *kctl;
+
+	if (!hook->hook || !hook->sw_kctl)
+		return 0;
+	snd_ctl_add_vmaster_hook(hook->sw_kctl, hook->hook, codec);
+	hook->codec = codec;
+	hook->mute_mode = HDA_VMUTE_FOLLOW_MASTER;
+	kctl = snd_ctl_new1(&vmaster_mute_mode, hook);
+	if (!kctl)
+		return -ENOMEM;
+	return snd_hda_ctl_add(codec, 0, kctl);
+}
+EXPORT_SYMBOL_HDA(snd_hda_add_vmaster_hook);
+
+/*
+ * Call the hook with the current value for synchronization
+ * Should be called in init callback
+ */
+void snd_hda_sync_vmaster_hook(struct hda_vmaster_mute_hook *hook)
+{
+	if (!hook->hook || !hook->codec)
+		return;
+	switch (hook->mute_mode) {
+	case HDA_VMUTE_FOLLOW_MASTER:
+		snd_ctl_sync_vmaster_hook(hook->sw_kctl);
+		break;
+	default:
+		hook->hook(hook->codec, hook->mute_mode);
+		break;
+	}
+}
+EXPORT_SYMBOL_HDA(snd_hda_sync_vmaster_hook);
+
+
 /**
  * snd_hda_mixer_amp_switch_info - Info callback for a standard AMP mixer switch
  *

sound/pci/hda/hda_local.h

@@ -147,6 +147,27 @@ int __snd_hda_add_vmaster(struct hda_codec *codec, char *name,
 	__snd_hda_add_vmaster(codec, name, tlv, slaves, suffix, true, NULL)
 int snd_hda_codec_reset(struct hda_codec *codec);
 
+enum {
+	HDA_VMUTE_OFF,
+	HDA_VMUTE_ON,
+	HDA_VMUTE_FOLLOW_MASTER,
+};
+
+struct hda_vmaster_mute_hook {
+	/* below two fields must be filled by the caller of
+	 * snd_hda_add_vmaster_hook() beforehand
+	 */
+	struct snd_kcontrol *sw_kctl;
+	void (*hook)(void *, int);
+	/* below are initialized automatically */
+	unsigned int mute_mode; /* HDA_VMUTE_XXX */
+	struct hda_codec *codec;
+};
+
+int snd_hda_add_vmaster_hook(struct hda_codec *codec,
+			     struct hda_vmaster_mute_hook *hook);
+void snd_hda_sync_vmaster_hook(struct hda_vmaster_mute_hook *hook);
+
 /* amp value bits */
 #define HDA_AMP_MUTE	0x80
 #define HDA_AMP_UNMUTE	0x00

sound/pci/hda/patch_conexant.c

@@ -70,8 +70,7 @@ struct conexant_spec {
 	const struct snd_kcontrol_new *mixers[5];
 	int num_mixers;
 	hda_nid_t vmaster_nid;
-	struct snd_kcontrol *vmaster_sw_kctl;
-	void (*vmaster_hook)(struct snd_kcontrol *, int);
+	struct hda_vmaster_mute_hook vmaster_mute;
 
 	const struct hda_verb *init_verbs[5];	/* initialization verbs
 						 * don't forget NULL
@@ -518,7 +517,7 @@ static int conexant_build_controls(struct hda_codec *codec)
 		err = __snd_hda_add_vmaster(codec, "Master Playback Switch",
 					    NULL, slave_pfxs,
 					    "Playback Switch", true,
-					    &spec->vmaster_sw_kctl);
+					    &spec->vmaster_mute.sw_kctl);
 		if (err < 0)
 			return err;
 	}
@@ -4101,7 +4100,7 @@ static int cx_auto_init(struct hda_codec *codec)
 	cx_auto_init_input(codec);
 	cx_auto_init_digital(codec);
 	snd_hda_jack_report_sync(codec);
-	snd_ctl_sync_vmaster_hook(spec->vmaster_sw_kctl);
+	snd_hda_sync_vmaster_hook(&spec->vmaster_mute);
 	return 0;
 }
 
@@ -4347,10 +4346,10 @@ static int cx_auto_build_controls(struct hda_codec *codec)
 	err = snd_hda_jack_add_kctls(codec, &spec->autocfg);
 	if (err < 0)
 		return err;
-	if (spec->vmaster_hook && spec->vmaster_sw_kctl) {
-		snd_ctl_add_vmaster_hook(spec->vmaster_sw_kctl,
-					 spec->vmaster_hook, codec);
-		snd_ctl_sync_vmaster_hook(spec->vmaster_sw_kctl);
+	if (spec->vmaster_mute.hook && spec->vmaster_mute.sw_kctl) {
+		err = snd_hda_add_vmaster_hook(codec, &spec->vmaster_mute);
+		if (err < 0)
+			return err;
 	}
 	return 0;
 }
@@ -4481,7 +4480,7 @@ static int patch_conexant_auto(struct hda_codec *codec)
 	/* NOTE: this should be applied via fixup once when the generic
 	 *       fixup code is merged to hda_codec.c
 	 */
-	spec->vmaster_hook = cx_auto_vmaster_hook;
+	spec->vmaster_mute.hook = cx_auto_vmaster_hook;
 
 	err = cx_auto_search_adcs(codec);
 	if (err < 0)

sound/pci/hda/patch_realtek.c

@@ -198,7 +198,7 @@ struct alc_spec {
 
 	/* for virtual master */
 	hda_nid_t vmaster_nid;
-	struct snd_kcontrol *vmaster_sw_kctl;
+	struct hda_vmaster_mute_hook vmaster_mute;
 #ifdef CONFIG_SND_HDA_POWER_SAVE
 	struct hda_loopback_check loopback;
 	int num_loopbacks;
@@ -1960,7 +1960,7 @@ static int __alc_build_controls(struct hda_codec *codec)
 		err = __snd_hda_add_vmaster(codec, "Master Playback Switch",
 					    NULL, alc_slave_pfxs,
 					    "Playback Switch",
-					    true, &spec->vmaster_sw_kctl);
+					    true, &spec->vmaster_mute.sw_kctl);
 		if (err < 0)
 			return err;
 	}
@@ -5894,13 +5894,11 @@ static void alc269_fixup_mic2_mute(struct hda_codec *codec,
 	struct alc_spec *spec = codec->spec;
 	switch (action) {
 	case ALC_FIXUP_ACT_BUILD:
-		if (!spec->vmaster_sw_kctl)
-			return;
-		snd_ctl_add_vmaster_hook(spec->vmaster_sw_kctl,
-					 alc269_fixup_mic2_mute_hook, codec);
+		spec->vmaster_mute.hook = alc269_fixup_mic2_mute_hook;
+		snd_hda_add_vmaster_hook(codec, &spec->vmaster_mute);
 		/* fallthru */
 	case ALC_FIXUP_ACT_INIT:
-		snd_ctl_sync_vmaster_hook(spec->vmaster_sw_kctl);
+		snd_hda_sync_vmaster_hook(&spec->vmaster_mute);
 		break;
 	}
 }

sound/pci/hda/patch_sigmatel.c

@@ -311,7 +311,7 @@ struct sigmatel_spec {
 	unsigned auto_dmic_cnt;
 	hda_nid_t auto_dmic_nids[MAX_DMICS_NUM];
 
-	struct snd_kcontrol *vmaster_sw_kctl;
+	struct hda_vmaster_mute_hook vmaster_mute;
 };
 
 static const hda_nid_t stac9200_adc_nids[1] = {
@@ -1160,14 +1160,15 @@ static int stac92xx_build_controls(struct hda_codec *codec)
 	err = __snd_hda_add_vmaster(codec, "Master Playback Switch",
 				    NULL, slave_pfxs,
 				    "Playback Switch", true,
-				    &spec->vmaster_sw_kctl);
+				    &spec->vmaster_mute.sw_kctl);
 	if (err < 0)
 		return err;
 
 	if (spec->gpio_led) {
-		snd_ctl_add_vmaster_hook(spec->vmaster_sw_kctl,
-					 stac92xx_vmaster_hook, codec);
-		snd_ctl_sync_vmaster_hook(spec->vmaster_sw_kctl);
+		spec->vmaster_mute.hook = stac92xx_vmaster_hook;
+		err = snd_hda_add_vmaster_hook(codec, &spec->vmaster_mute);
+		if (err < 0)
+			return err;
 	}
 
 	if (spec->aloopback_ctl &&
@@ -4432,7 +4433,7 @@ static int stac92xx_init(struct hda_codec *codec)
 	snd_hda_jack_report_sync(codec);
 
 	/* sync mute LED */
-	snd_ctl_sync_vmaster_hook(spec->vmaster_sw_kctl);
+	snd_hda_sync_vmaster_hook(&spec->vmaster_mute);
 	if (spec->dac_list)
 		stac92xx_power_down(codec);
 	return 0;