ALSA: HDA - Add Independent Headphone for all models of ad1988/ad1989

- Add "AD198x Headphone" playback device for independent headphone playback
  while playing 7.1 surround using rear panel audio jacks.

- Remove "6stack-dig-fp" model since "Headphone Playback Volume" control using
  DAC0 instead of DAC1 (HDA_FRONT) was already added to all models.

- Add "Independent HP" switch to enable/disable this playback device.
  When the switch is OFF, headphone use "copy front" mode to get the front
  channel as the green jack.
  When the switch is ON, you can play stereo sound through "AD198x Headphone"
  device to headphone while playing 7.1 surround sound through "AD198x Analog"
  device.
  The switch cannot be changed when either "AD198x Headphone" or "AD198X Analog"
  is open.

Signed-off-by: Raymond Yau <superquad.vortex2@gmail.com>
Signed-off-by: Takashi Iwai <tiwai@suse.de>

sound/pci/hda/patch_analog.c

@@ -48,6 +48,8 @@ struct ad198x_spec {
 
 	const hda_nid_t *alt_dac_nid;
 	const struct hda_pcm_stream *stream_analog_alt_playback;
+	int independent_hp;
+	int num_active_streams;
 
 	/* capture */
 	unsigned int num_adc_nids;
@@ -302,6 +304,72 @@ static int ad198x_check_power_status(struct hda_codec *codec, hda_nid_t nid)
 }
 #endif
 
+static void activate_ctl(struct hda_codec *codec, const char *name, int active)
+{
+	struct snd_kcontrol *ctl = snd_hda_find_mixer_ctl(codec, name);
+	if (ctl) {
+		ctl->vd[0].access &= ~SNDRV_CTL_ELEM_ACCESS_INACTIVE;
+		ctl->vd[0].access |= active ? 0 :
+			SNDRV_CTL_ELEM_ACCESS_INACTIVE;
+		ctl->vd[0].access &= ~SNDRV_CTL_ELEM_ACCESS_WRITE;
+		ctl->vd[0].access |= active ?
+			SNDRV_CTL_ELEM_ACCESS_WRITE : 0;
+		snd_ctl_notify(codec->bus->card,
+			       SNDRV_CTL_EVENT_MASK_INFO, &ctl->id);
+	}
+}
+
+static void set_stream_active(struct hda_codec *codec, bool active)
+{
+	struct ad198x_spec *spec = codec->spec;
+	if (active)
+		spec->num_active_streams++;
+	else
+		spec->num_active_streams--;
+	activate_ctl(codec, "Independent HP", spec->num_active_streams == 0);
+}
+
+static int ad1988_independent_hp_info(struct snd_kcontrol *kcontrol,
+				   struct snd_ctl_elem_info *uinfo)
+{
+	static const char * const texts[] = { "OFF", "ON", NULL};
+	int index;
+	uinfo->type = SNDRV_CTL_ELEM_TYPE_ENUMERATED;
+	uinfo->count = 1;
+	uinfo->value.enumerated.items = 2;
+	index = uinfo->value.enumerated.item;
+	if (index >= 2)
+		index = 1;
+	strcpy(uinfo->value.enumerated.name, texts[index]);
+	return 0;
+}
+
+static int ad1988_independent_hp_get(struct snd_kcontrol *kcontrol,
+				  struct snd_ctl_elem_value *ucontrol)
+{
+	struct hda_codec *codec = snd_kcontrol_chip(kcontrol);
+	struct ad198x_spec *spec = codec->spec;
+	ucontrol->value.enumerated.item[0] = spec->independent_hp;
+	return 0;
+}
+
+static int ad1988_independent_hp_put(struct snd_kcontrol *kcontrol,
+				  struct snd_ctl_elem_value *ucontrol)
+{
+	struct hda_codec *codec = snd_kcontrol_chip(kcontrol);
+	struct ad198x_spec *spec = codec->spec;
+	unsigned int select = ucontrol->value.enumerated.item[0];
+	if (spec->independent_hp != select) {
+		spec->independent_hp = select;
+		if (spec->independent_hp)
+			spec->multiout.hp_nid = 0;
+		else
+			spec->multiout.hp_nid = spec->alt_dac_nid[0];
+		return 1;
+	}
+	return 0;
+}
+
 /*
  * Analog playback callbacks
  */
@@ -310,8 +378,15 @@ static int ad198x_playback_pcm_open(struct hda_pcm_stream *hinfo,
 				    struct snd_pcm_substream *substream)
 {
 	struct ad198x_spec *spec = codec->spec;
-	return snd_hda_multi_out_analog_open(codec, &spec->multiout, substream,
+	int err;
+	set_stream_active(codec, true);
+	err = snd_hda_multi_out_analog_open(codec, &spec->multiout, substream,
 					     hinfo);
+	if (err < 0) {
+		set_stream_active(codec, false);
+		return err;
+	}
+	return 0;
 }
 
 static int ad198x_playback_pcm_prepare(struct hda_pcm_stream *hinfo,
@@ -333,11 +408,41 @@ static int ad198x_playback_pcm_cleanup(struct hda_pcm_stream *hinfo,
 	return snd_hda_multi_out_analog_cleanup(codec, &spec->multiout);
 }
 
+static int ad198x_playback_pcm_close(struct hda_pcm_stream *hinfo,
+				 struct hda_codec *codec,
+				 struct snd_pcm_substream *substream)
+{
+	set_stream_active(codec, false);
+	return 0;
+}
+
+static int ad1988_alt_playback_pcm_open(struct hda_pcm_stream *hinfo,
+				 struct hda_codec *codec,
+				 struct snd_pcm_substream *substream)
+{
+	struct ad198x_spec *spec = codec->spec;
+	if (!spec->independent_hp)
+		return -EBUSY;
+	set_stream_active(codec, true);
+	return 0;
+}
+
+static int ad1988_alt_playback_pcm_close(struct hda_pcm_stream *hinfo,
+				 struct hda_codec *codec,
+				 struct snd_pcm_substream *substream)
+{
+	set_stream_active(codec, false);
+	return 0;
+}
+
 static const struct hda_pcm_stream ad198x_pcm_analog_alt_playback = {
 	.substreams = 1,
 	.channels_min = 2,
 	.channels_max = 2,
-	/* NID is set in ad198x_build_pcms */
+	.ops = {
+		.open  = ad1988_alt_playback_pcm_open,
+		.close = ad1988_alt_playback_pcm_close
+	},
 };
 
 /*
@@ -402,7 +507,6 @@ static int ad198x_capture_pcm_cleanup(struct hda_pcm_stream *hinfo,
 	return 0;
 }
 
-
 /*
  */
 static const struct hda_pcm_stream ad198x_pcm_analog_playback = {
@@ -413,7 +517,8 @@ static const struct hda_pcm_stream ad198x_pcm_analog_playback = {
 	.ops = {
 		.open = ad198x_playback_pcm_open,
 		.prepare = ad198x_playback_pcm_prepare,
-		.cleanup = ad198x_playback_pcm_cleanup
+		.cleanup = ad198x_playback_pcm_cleanup,
+		.close = ad198x_playback_pcm_close
 	},
 };
 
@@ -2058,7 +2163,6 @@ static int patch_ad1981(struct hda_codec *codec)
 enum {
 	AD1988_6STACK,
 	AD1988_6STACK_DIG,
-	AD1988_6STACK_DIG_FP,
 	AD1988_3STACK,
 	AD1988_3STACK_DIG,
 	AD1988_LAPTOP,
@@ -2168,6 +2272,17 @@ static int ad198x_ch_mode_put(struct snd_kcontrol *kcontrol,
 	return err;
 }
 
+static const struct snd_kcontrol_new ad1988_hp_mixers[] = {
+	{
+		.iface = SNDRV_CTL_ELEM_IFACE_MIXER,
+		.name = "Independent HP",
+		.info = ad1988_independent_hp_info,
+		.get = ad1988_independent_hp_get,
+		.put = ad1988_independent_hp_put,
+	},
+	{ } /* end */
+};
+
 /* 6-stack mode */
 static const struct snd_kcontrol_new ad1988_6stack_mixers1[] = {
 	HDA_CODEC_VOLUME("Front Playback Volume", 0x04, 0x0, HDA_OUTPUT),
@@ -2211,7 +2326,6 @@ static const struct snd_kcontrol_new ad1988_6stack_mixers2[] = {
 
 	HDA_CODEC_VOLUME("Front Mic Boost Volume", 0x39, 0x0, HDA_OUTPUT),
 	HDA_CODEC_VOLUME("Mic Boost Volume", 0x3c, 0x0, HDA_OUTPUT),
-
 	{ } /* end */
 };
 
@@ -3147,7 +3261,6 @@ static int ad1988_auto_init(struct hda_codec *codec)
 static const char * const ad1988_models[AD1988_MODEL_LAST] = {
 	[AD1988_6STACK]		= "6stack",
 	[AD1988_6STACK_DIG]	= "6stack-dig",
-	[AD1988_6STACK_DIG_FP]	= "6stack-dig-fp",
 	[AD1988_3STACK]		= "3stack",
 	[AD1988_3STACK_DIG]	= "3stack-dig",
 	[AD1988_LAPTOP]		= "laptop",
@@ -3206,11 +3319,10 @@ static int patch_ad1988(struct hda_codec *codec)
 	set_beep_amp(spec, 0x10, 0, HDA_OUTPUT);
 
 	if (!spec->multiout.hp_nid)
-		spec->multiout.hp_nid = 0x03;
+		spec->multiout.hp_nid = ad1988_alt_dac_nid[0];
 	switch (board_config) {
 	case AD1988_6STACK:
 	case AD1988_6STACK_DIG:
-	case AD1988_6STACK_DIG_FP:
 		spec->multiout.max_channels = 8;
 		spec->multiout.num_dacs = 4;
 		if (is_rev2(codec))
@@ -3226,16 +3338,7 @@ static int patch_ad1988(struct hda_codec *codec)
 		spec->mixers[1] = ad1988_6stack_mixers2;
 		spec->num_init_verbs = 1;
 		spec->init_verbs[0] = ad1988_6stack_init_verbs;
-		if (board_config == AD1988_6STACK_DIG_FP) {
-			spec->multiout.hp_nid = 0;
-			spec->slave_vols = ad1988_6stack_fp_slave_vols;
-			spec->slave_sws = ad1988_6stack_fp_slave_sws;
-			spec->alt_dac_nid = ad1988_alt_dac_nid;
-			spec->stream_analog_alt_playback =
-				&ad198x_pcm_analog_alt_playback;
-		}
-		if ((board_config == AD1988_6STACK_DIG) ||
-			(board_config == AD1988_6STACK_DIG_FP)) {
+		if (board_config == AD1988_6STACK_DIG) {
 			spec->multiout.dig_out_nid = AD1988_SPDIF_OUT;
 			spec->dig_in_nid = AD1988_SPDIF_IN;
 		}
@@ -3278,6 +3381,15 @@ static int patch_ad1988(struct hda_codec *codec)
 		break;
 	}
 
+	if (spec->autocfg.hp_pins[0]) {
+		spec->mixers[spec->num_mixers++] = ad1988_hp_mixers;
+		spec->slave_vols = ad1988_6stack_fp_slave_vols;
+		spec->slave_sws = ad1988_6stack_fp_slave_sws;
+		spec->alt_dac_nid = ad1988_alt_dac_nid;
+		spec->stream_analog_alt_playback =
+			&ad198x_pcm_analog_alt_playback;
+	}
+
 	spec->num_adc_nids = ARRAY_SIZE(ad1988_adc_nids);
 	spec->adc_nids = ad1988_adc_nids;
 	spec->capsrc_nids = ad1988_capsrc_nids;