ALSA: hda - Support auto-mic switching with IDT/STAC codec

Support the automatic mic-switching with some devices with IDT/STAC
codecs.  The condition is that the device has only two inputs, one
for an external mic and one for an internal mic.

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

1 files changed, 154 insertions, 16 deletions

diff --git a/sound/pci/hda/patch_sigmatel.c b/sound/pci/hda/patch_sigmatel.c
index 307e86ceede1..f39dc98519a1 100644
--- a/sound/pci/hda/patch_sigmatel.c
+++ b/sound/pci/hda/patch_sigmatel.c
@@ -40,6 +40,7 @@ enum {
         STAC_INSERT_EVENT,
         STAC_PWR_EVENT,
         STAC_HP_EVENT,
+        STAC_MIC_EVENT,
 };
 
 enum {
@@ -176,6 +177,12 @@ struct sigmatel_jack {
         struct snd_jack *jack;
 };
 
+struct sigmatel_mic_route {
+        hda_nid_t pin;
+        unsigned char mux_idx;
+        unsigned char dmux_idx;
+};
+
 struct sigmatel_spec {
         struct snd_kcontrol_new *mixers[4];
         unsigned int num_mixers;
@@ -187,6 +194,7 @@ struct sigmatel_spec {
         unsigned int hp_detect: 1;
         unsigned int spdif_mute: 1;
         unsigned int check_volume_offset:1;
+        unsigned int auto_mic:1;
 
         /* gpio lines */
         unsigned int eapd_mask;
@@ -243,6 +251,9 @@ struct sigmatel_spec {
         unsigned long *capsws; /* amp-mute attr: HDA_COMPOSE_AMP_VAL() */
         unsigned int num_caps; /* number of capture volume/switch elements */
 
+        struct sigmatel_mic_route ext_mic;
+        struct sigmatel_mic_route int_mic;
+
         const char **spdif_labels;
 
         hda_nid_t dig_in_nid;
@@ -1304,7 +1315,7 @@ static int stac92xx_build_controls(struct hda_codec *codec)
                 if (err < 0)
                         return err;
         }
-        if (spec->num_dmuxes > 0) {
+        if (!spec->auto_mic && spec->num_dmuxes > 0) {
                 stac_dmux_mixer.count = spec->num_dmuxes;
                 err = snd_hda_ctl_add(codec,
                                   snd_ctl_new1(&stac_dmux_mixer, codec));
@@ -2950,6 +2961,8 @@ static int stac92xx_add_input_source(struct sigmatel_spec *spec)
         struct snd_kcontrol_new *knew;
         struct hda_input_mux *imux = &spec->private_imux;
 
+        if (spec->auto_mic)
+                return 0; /* no need for input source */
         if (!spec->num_adcs || imux->num_items <= 1)
                 return 0; /* no need for input source control */
         knew = stac_control_new(spec, &stac_input_src_temp,
@@ -3557,14 +3570,26 @@ static const char *stac92xx_dmic_labels[5] = {
         "Digital Mic 3", "Digital Mic 4"
 };
 
+static int get_connection_index(struct hda_codec *codec, hda_nid_t mux,
+                                hda_nid_t nid)
+{
+        hda_nid_t conn[HDA_MAX_NUM_INPUTS];
+        int i, nums;
+
+        nums = snd_hda_get_connections(codec, mux, conn, ARRAY_SIZE(conn));
+        for (i = 0; i < nums; i++)
+                if (conn[i] == nid)
+                        return i;
+        return -1;
+}
+
 /* create playback/capture controls for input pins on dmic capable codecs */
 static int stac92xx_auto_create_dmic_input_ctls(struct hda_codec *codec,
                                                 const struct auto_pin_cfg *cfg)
 {
         struct sigmatel_spec *spec = codec->spec;
         struct hda_input_mux *dimux = &spec->private_dimux;
-        hda_nid_t con_lst[HDA_MAX_NUM_INPUTS];
-        int err, i, j;
+        int err, i;
         char name[32];
 
         dimux->items[dimux->num_items].label = stac92xx_dmic_labels[0];
@@ -3574,7 +3599,6 @@ static int stac92xx_auto_create_dmic_input_ctls(struct hda_codec *codec,
         for (i = 0; i < spec->num_dmics; i++) {
                 hda_nid_t nid;
                 int index;
-                int num_cons;
                 unsigned int wcaps;
                 unsigned int def_conf;
 
@@ -3583,17 +3607,10 @@ static int stac92xx_auto_create_dmic_input_ctls(struct hda_codec *codec,
                         continue;
 
                 nid = spec->dmic_nids[i];
-                num_cons = snd_hda_get_connections(codec,
-                                spec->dmux_nids[0],
-                                con_lst,
-                                HDA_MAX_NUM_INPUTS);
-                for (j = 0; j < num_cons; j++)
-                        if (con_lst[j] == nid) {
-                                index = j;
-                                goto found;
-                        }
-                continue;
-found:
+                index = get_connection_index(codec, spec->dmux_nids[0], nid);
+                if (index < 0)
+                        continue;
+
                 wcaps = get_wcaps(codec, nid) &
                         (AC_WCAP_OUT_AMP | AC_WCAP_IN_AMP);
 
@@ -3620,6 +3637,88 @@ found:
         return 0;
 }
 
+static int check_mic_pin(struct hda_codec *codec, hda_nid_t nid,
+                         hda_nid_t *fixed, hda_nid_t *ext)
+{
+        unsigned int cfg;
+
+        if (!nid)
+                return 0;
+        cfg = snd_hda_codec_get_pincfg(codec, nid);
+        switch (get_defcfg_connect(cfg)) {
+        case AC_JACK_PORT_FIXED:
+                if (*fixed)
+                        return 1; /* already occupied */
+                *fixed = nid;
+                break;
+        case AC_JACK_PORT_COMPLEX:
+                if (*ext)
+                        return 1; /* already occupied */
+                *ext = nid;
+                break;
+        }
+        return 0;
+}
+
+static int set_mic_route(struct hda_codec *codec,
+                         struct sigmatel_mic_route *mic,
+                         hda_nid_t pin)
+{
+        struct sigmatel_spec *spec = codec->spec;
+        struct auto_pin_cfg *cfg = &spec->autocfg;
+        int i;
+
+        mic->pin = pin;
+        for (i = AUTO_PIN_MIC; i <= AUTO_PIN_FRONT_MIC; i++)
+                if (pin == cfg->input_pins[i])
+                        break;
+        if (i <= AUTO_PIN_FRONT_MIC) {
+                /* analog pin */
+                mic->dmux_idx = 0;
+                i = get_connection_index(codec, spec->mux_nids[0], pin);
+                if (i < 0)
+                        return -1;
+                mic->mux_idx = i;
+        }  else {
+                /* digital pin */
+                mic->mux_idx = 0;
+                i = get_connection_index(codec, spec->dmux_nids[0], pin);
+                if (i < 0)
+                        return -1;
+                mic->dmux_idx = i;
+        }
+        return 0;
+}
+
+/* return non-zero if the device is for automatic mic switch */
+static int stac_check_auto_mic(struct hda_codec *codec)
+{
+        struct sigmatel_spec *spec = codec->spec;
+        struct auto_pin_cfg *cfg = &spec->autocfg;
+        hda_nid_t fixed, ext;
+        int i;
+
+        for (i = AUTO_PIN_LINE; i < AUTO_PIN_LAST; i++) {
+                if (cfg->input_pins[i])
+                        return 0; /* must be exclusively mics */
+        }
+        fixed = ext = 0;
+        for (i = AUTO_PIN_MIC; i <= AUTO_PIN_FRONT_MIC; i++)
+                if (check_mic_pin(codec, cfg->input_pins[i], &fixed, &ext))
+                        return 0;
+        for (i = 0; i < spec->num_dmics; i++)
+                if (check_mic_pin(codec, spec->dmic_nids[i], &fixed, &ext))
+                        return 0;
+        if (!fixed || !ext)
+                return 0;
+        if (!(get_wcaps(codec, ext) & AC_WCAP_UNSOL_CAP))
+                return 0; /* no unsol support */
+        if (set_mic_route(codec, &spec->ext_mic, ext) ||
+            set_mic_route(codec, &spec->int_mic, fixed))
+                return 0; /* something is wrong */
+        return 1;
+}
+
 /* create playback/capture controls for input pins */
 static int stac92xx_auto_create_analog_input_ctls(struct hda_codec *codec, const struct auto_pin_cfg *cfg)
 {
@@ -3837,6 +3936,14 @@ static int stac92xx_parse_auto_config(struct hda_codec *codec, hda_nid_t dig_out
                 spec->autocfg.line_outs = 0;
         }
 
+        if (stac_check_auto_mic(codec)) {
+                spec->auto_mic = 1;
+                /* only one capture for auto-mic */
+                spec->num_adcs = 1;
+                spec->num_caps = 1;
+                spec->num_muxes = 1;
+        }
+
         for (i = 0; i < spec->num_caps; i++) {
                 err = stac92xx_add_capvol_ctls(codec, spec->capvols[i],
                                                spec->capsws[i], i);
@@ -4264,6 +4371,10 @@ static int stac92xx_init(struct hda_codec *codec)
                 for (i = 0; i < cfg->hp_outs; i++)
                         stac_toggle_power_map(codec, cfg->hp_pins[i], 1);
         }
+        if (spec->auto_mic) {
+                if (enable_pin_detect(codec, spec->ext_mic.pin, STAC_MIC_EVENT))
+                        stac_issue_unsol_event(codec, spec->ext_mic.pin);
+        }
         for (i = 0; i < AUTO_PIN_LAST; i++) {
                 hda_nid_t nid = cfg->input_pins[i];
                 if (nid) {
@@ -4601,6 +4712,25 @@ static void stac92xx_report_jack(struct hda_codec *codec, hda_nid_t nid)
         }
 }
 
+static void stac92xx_mic_detect(struct hda_codec *codec)
+{
+        struct sigmatel_spec *spec = codec->spec;
+        struct sigmatel_mic_route *mic;
+
+        if (get_pin_presence(codec, spec->ext_mic.pin))
+                mic = &spec->ext_mic;
+        else
+                mic = &spec->int_mic;
+        if (mic->dmux_idx)
+                snd_hda_codec_write_cache(codec, spec->dmux_nids[0], 0,
+                                          AC_VERB_SET_CONNECT_SEL,
+                                          mic->dmux_idx);
+        else
+                snd_hda_codec_write_cache(codec, spec->mux_nids[0], 0,
+                                          AC_VERB_SET_CONNECT_SEL,
+                                          mic->mux_idx);
+}
+
 static void stac_issue_unsol_event(struct hda_codec *codec, hda_nid_t nid)
 {
         struct sigmatel_event *event = stac_get_event(codec, nid);
@@ -4623,7 +4753,15 @@ static void stac92xx_unsol_event(struct hda_codec *codec, unsigned int res)
         switch (event->type) {
         case STAC_HP_EVENT:
                 stac92xx_hp_detect(codec);
-                /* fallthru */
+                break;
+        case STAC_MIC_EVENT:
+                stac92xx_mic_detect(codec);
+                break;
+        }
+
+        switch (event->type) {
+        case STAC_HP_EVENT:
+        case STAC_MIC_EVENT:
         case STAC_INSERT_EVENT:
         case STAC_PWR_EVENT:
                 if (spec->num_pwrs > 0)