ALSA: hda - Add the generic Headphone Mic feature

This patch improves the generic parser code to allow to set up the
headphone jack as a mic input.  User can enable this feature by giving
hp_mic hint string.

The former shared hp/mic feature for the single built-in mic is still
retained.  This detection can be disabled now via hp_mic_detect hint
string, too.

Signed-off-by: Takashi Iwai <tiwai@suse.de>

Documentation/sound/alsa/HD-Audio.txt

@@ -466,6 +466,9 @@ The generic parser supports the following hints:
 - add_in_jack_modes (bool): add "xxx Jack Mode" enum controls to each
   input jack for allowing to change the mic bias vref
 - power_down_unused (bool): power down the unused widgets
+- add_hp_mic (bool): add the headphone to capture source if possible
+- hp_mic_detect (bool): enable/disable the hp/mic shared input for a
+  single built-in mic case; default true
 - mixer_nid (int): specifies the widget NID of the analog-loopback
   mixer
 

sound/pci/hda/hda_generic.c

@@ -159,6 +159,12 @@ static void parse_user_hints(struct hda_codec *codec)
 	val = snd_hda_get_bool_hint(codec, "power_down_unused");
 	if (val >= 0)
 		spec->power_down_unused = !!val;
+	val = snd_hda_get_bool_hint(codec, "add_hp_mic");
+	if (val >= 0)
+		spec->hp_mic = !!val;
+	val = snd_hda_get_bool_hint(codec, "hp_mic_detect");
+	if (val >= 0)
+		spec->suppress_hp_mic_detect = !val;
 
 	if (!snd_hda_get_int_hint(codec, "mixer_nid", &val))
 		spec->mixer_nid = val;
@@ -2194,63 +2200,97 @@ static int create_loopback_mixing_ctl(struct hda_codec *codec)
 static void call_update_outputs(struct hda_codec *codec);
 
 /* for shared I/O, change the pin-control accordingly */
-static void update_shared_mic_hp(struct hda_codec *codec, bool set_as_mic)
+static void update_hp_mic(struct hda_codec *codec, int adc_mux, bool force)
 {
 	struct hda_gen_spec *spec = codec->spec;
+	bool as_mic;
 	unsigned int val;
-	hda_nid_t pin = spec->autocfg.inputs[1].pin;
-	/* NOTE: this assumes that there are only two inputs, the
-	 * first is the real internal mic and the second is HP/mic jack.
-	 */
+	hda_nid_t pin;
+
+	pin = spec->hp_mic_pin;
+	as_mic = spec->cur_mux[adc_mux] == spec->hp_mic_mux_idx;
+
+	if (!force) {
+		val = snd_hda_codec_get_pin_target(codec, pin);
+		if (as_mic) {
+			if (val & PIN_IN)
+				return;
+		} else {
+			if (val & PIN_OUT)
+				return;
+		}
+	}
 
 	val = snd_hda_get_default_vref(codec, pin);
-
-	/* This pin does not have vref caps - let's enable vref on pin 0x18
-	   instead, as suggested by Realtek */
+	/* if the HP pin doesn't support VREF and the codec driver gives an
+	 * alternative pin, set up the VREF on that pin instead
+	 */
 	if (val == AC_PINCTL_VREF_HIZ && spec->shared_mic_vref_pin) {
 		const hda_nid_t vref_pin = spec->shared_mic_vref_pin;
 		unsigned int vref_val = snd_hda_get_default_vref(codec, vref_pin);
 		if (vref_val != AC_PINCTL_VREF_HIZ)
 			snd_hda_set_pin_ctl_cache(codec, vref_pin,
-					PIN_IN | (set_as_mic ? vref_val : 0));
+						  PIN_IN | (as_mic ? vref_val : 0));
 	}
 
-	val = set_as_mic ? val | PIN_IN : PIN_HP;
+	if (as_mic)
+		val |= PIN_IN;
+	else
+		val = PIN_HP;
 	set_pin_target(codec, pin, val, true);
 
-	spec->automute_speaker = !set_as_mic;
-	call_update_outputs(codec);
+	/* update HP auto-mute state too */
+	if (spec->hp_automute_hook)
+		spec->hp_automute_hook(codec, NULL);
+	else
+		snd_hda_gen_hp_automute(codec, NULL);
 }
 
 /* create a shared input with the headphone out */
-static int create_shared_input(struct hda_codec *codec)
+static int create_hp_mic(struct hda_codec *codec)
 {
 	struct hda_gen_spec *spec = codec->spec;
 	struct auto_pin_cfg *cfg = &spec->autocfg;
 	unsigned int defcfg;
 	hda_nid_t nid;
 
-	/* only one internal input pin? */
-	if (cfg->num_inputs != 1)
-		return 0;
-	defcfg = snd_hda_codec_get_pincfg(codec, cfg->inputs[0].pin);
-	if (snd_hda_get_input_pin_attr(defcfg) != INPUT_PIN_ATTR_INT)
+	if (!spec->hp_mic) {
+		if (spec->suppress_hp_mic_detect)
+			return 0;
+		/* automatic detection: only if no input or a single internal
+		 * input pin is found, try to detect the shared hp/mic
+		 */
+		if (cfg->num_inputs > 1)
+			return 0;
+		else if (cfg->num_inputs == 1) {
+			defcfg = snd_hda_codec_get_pincfg(codec, cfg->inputs[0].pin);
+			if (snd_hda_get_input_pin_attr(defcfg) != INPUT_PIN_ATTR_INT)
+				return 0;
+		}
+	}
+
+	spec->hp_mic = 0; /* clear once */
+	if (cfg->num_inputs >= AUTO_CFG_MAX_INS)
 		return 0;
 
-	if (cfg->hp_outs == 1 && cfg->line_out_type == AUTO_PIN_SPEAKER_OUT)
-		nid = cfg->hp_pins[0]; /* OK, we have a single HP-out */
-	else if (cfg->line_outs == 1 && cfg->line_out_type == AUTO_PIN_HP_OUT)
-		nid = cfg->line_out_pins[0]; /* OK, we have a single line-out */
-	else
-		return 0; /* both not available */
+	nid = 0;
+	if (cfg->line_out_type == AUTO_PIN_HP_OUT && cfg->line_outs > 0)
+		nid = cfg->line_out_pins[0];
+	else if (cfg->hp_outs > 0)
+		nid = cfg->hp_pins[0];
+	if (!nid)
+		return 0;
 
 	if (!(snd_hda_query_pin_caps(codec, nid) & AC_PINCAP_IN))
 		return 0; /* no input */
 
-	cfg->inputs[1].pin = nid;
-	cfg->inputs[1].type = AUTO_PIN_MIC;
-	cfg->num_inputs = 2;
-	spec->shared_mic_hp = 1;
+	cfg->inputs[cfg->num_inputs].pin = nid;
+	cfg->inputs[cfg->num_inputs].type = AUTO_PIN_MIC;
+	cfg->num_inputs++;
+	spec->hp_mic = 1;
+	spec->hp_mic_pin = nid;
+	/* we can't handle auto-mic together with HP-mic */
+	spec->suppress_auto_mic = 1;
 	snd_printdd("hda-codec: Enable shared I/O jack on NID 0x%x\n", nid);
 	return 0;
 }
@@ -2602,7 +2642,6 @@ static int check_dyn_adc_switch(struct hda_codec *codec)
 	unsigned int ok_bits;
 	int i, n, nums;
 
- again:
 	nums = 0;
 	ok_bits = 0;
 	for (n = 0; n < spec->num_adc_nids; n++) {
@@ -2617,12 +2656,6 @@ static int check_dyn_adc_switch(struct hda_codec *codec)
 	}
 
 	if (!ok_bits) {
-		if (spec->shared_mic_hp) {
-			spec->shared_mic_hp = 0;
-			imux->num_items = 1;
-			goto again;
-		}
-
 		/* check whether ADC-switch is possible */
 		for (i = 0; i < imux->num_items; i++) {
 			for (n = 0; n < spec->num_adc_nids; n++) {
@@ -2655,7 +2688,8 @@ static int check_dyn_adc_switch(struct hda_codec *codec)
 		spec->num_adc_nids = nums;
 	}
 
-	if (imux->num_items == 1 || spec->shared_mic_hp) {
+	if (imux->num_items == 1 ||
+	    (imux->num_items == 2 && spec->hp_mic)) {
 		snd_printdd("hda-codec: reducing to a single ADC\n");
 		spec->num_adc_nids = 1; /* reduce to a single ADC */
 	}
@@ -2692,6 +2726,8 @@ static int parse_capture_source(struct hda_codec *codec, hda_nid_t pin,
 			snd_hda_get_path_idx(codec, path);
 
 		if (!imux_added) {
+			if (spec->hp_mic_pin == pin)
+				spec->hp_mic_mux_idx = imux->num_items;
 			spec->imux_pins[imux->num_items] = pin;
 			snd_hda_add_imux_item(imux, label, cfg_idx, NULL);
 			imux_added = true;
@@ -3416,8 +3452,8 @@ static int mux_select(struct hda_codec *codec, unsigned int adc_idx,
 
 	spec->cur_mux[adc_idx] = idx;
 
-	if (spec->shared_mic_hp)
-		update_shared_mic_hp(codec, spec->cur_mux[adc_idx]);
+	if (spec->hp_mic)
+		update_hp_mic(codec, adc_idx, false);
 
 	if (spec->dyn_adc_switch)
 		dyn_adc_pcm_resetup(codec, idx);
@@ -3465,18 +3501,21 @@ static void do_automute(struct hda_codec *codec, int num_pins, hda_nid_t *pins,
 
 	for (i = 0; i < num_pins; i++) {
 		hda_nid_t nid = pins[i];
-		unsigned int val;
+		unsigned int val, oldval;
 		if (!nid)
 			break;
+		oldval = snd_hda_codec_get_pin_target(codec, nid);
+		if (oldval & PIN_IN)
+			continue; /* no mute for inputs */
 		/* don't reset VREF value in case it's controlling
 		 * the amp (see alc861_fixup_asus_amp_vref_0f())
 		 */
 		if (spec->keep_vref_in_automute)
-			val = snd_hda_codec_get_pin_target(codec, nid) & ~PIN_HP;
+			val = oldval & ~PIN_HP;
 		else
 			val = 0;
 		if (!mute)
-			val |= snd_hda_codec_get_pin_target(codec, nid);
+			val |= oldval;
 		/* here we call update_pin_ctl() so that the pinctl is changed
 		 * without changing the pinctl target value;
 		 * the original target value will be still referred at the
@@ -3497,8 +3536,7 @@ void snd_hda_gen_update_outputs(struct hda_codec *codec)
 	 * in general, HP pins/amps control should be enabled in all cases,
 	 * but currently set only for master_mute, just to be safe
 	 */
-	if (!spec->shared_mic_hp) /* don't change HP-pin when shared with mic */
-		do_automute(codec, ARRAY_SIZE(spec->autocfg.hp_pins),
+	do_automute(codec, ARRAY_SIZE(spec->autocfg.hp_pins),
 		    spec->autocfg.hp_pins, spec->master_mute);
 
 	if (!spec->automute_speaker)
@@ -3978,7 +4016,7 @@ int snd_hda_gen_parse_auto_config(struct hda_codec *codec,
 	err = create_loopback_mixing_ctl(codec);
 	if (err < 0)
 		return err;
-	err = create_shared_input(codec);
+	err = create_hp_mic(codec);
 	if (err < 0)
 		return err;
 	err = create_input_ctls(codec);
@@ -4004,11 +4042,9 @@ int snd_hda_gen_parse_auto_config(struct hda_codec *codec,
 	if (err < 0)
 		return err;
 
-	if (!spec->shared_mic_hp) {
-		err = check_auto_mic_availability(codec);
-		if (err < 0)
-			return err;
-	}
+	err = check_auto_mic_availability(codec);
+	if (err < 0)
+		return err;
 
 	err = create_capture_mixers(codec);
 	if (err < 0)
@@ -4115,9 +4151,9 @@ int snd_hda_gen_build_controls(struct hda_codec *codec)
 
 	free_kctls(spec); /* no longer needed */
 
-	if (spec->shared_mic_hp) {
+	if (spec->hp_mic_pin) {
 		int err;
-		int nid = spec->autocfg.inputs[1].pin;
+		int nid = spec->hp_mic_pin;
 		err = snd_hda_jack_add_kctl(codec, nid, "Headphone Mic", 0);
 		if (err < 0)
 			return err;
@@ -4780,11 +4816,10 @@ static void init_input_src(struct hda_codec *codec)
 				snd_hda_activate_path(codec, path, active, false);
 			}
 		}
+		if (spec->hp_mic)
+			update_hp_mic(codec, c, true);
 	}
 
-	if (spec->shared_mic_hp)
-		update_shared_mic_hp(codec, spec->cur_mux[0]);
-
 	if (spec->cap_sync_hook)
 		spec->cap_sync_hook(codec, NULL);
 }

sound/pci/hda/hda_generic.h

@@ -145,7 +145,10 @@ struct hda_gen_spec {
 	hda_nid_t private_dac_nids[AUTO_CFG_MAX_OUTS];
 	hda_nid_t imux_pins[HDA_MAX_NUM_INPUTS];
 	unsigned int dyn_adc_idx[HDA_MAX_NUM_INPUTS];
+	/* shared hp/mic */
 	hda_nid_t shared_mic_vref_pin;
+	hda_nid_t hp_mic_pin;
+	int hp_mic_mux_idx;
 
 	/* DAC/ADC lists */
 	int num_all_dacs;
@@ -200,7 +203,8 @@ struct hda_gen_spec {
 
 	/* other parse behavior flags */
 	unsigned int need_dac_fix:1; /* need to limit DACs for multi channels */
-	unsigned int shared_mic_hp:1; /* HP/Mic-in sharing */
+	unsigned int hp_mic:1; /* Allow HP as a mic-in */
+	unsigned int suppress_hp_mic_detect:1; /* Don't detect HP/mic */
 	unsigned int no_primary_hp:1; /* Don't prefer HP pins to speaker pins */
 	unsigned int multi_cap_vol:1; /* allow multiple capture xxx volumes */
 	unsigned int inv_dmic_split:1; /* inverted dmic w/a for conexant */