[ALSA] hda: add sigmatel hp detect support

HDA Codec driver
Adds support for detecting hp insertion/removal and enable/disable of
lineouts based on unsolicited events.

Signed-off-by: Matt <matt@embeddedalley.com>
Signed-off-by: Takashi Iwai <tiwai@suse.de>

2 files changed, 63 insertions, 2 deletions

diff --git a/sound/pci/hda/hda_codec.h b/sound/pci/hda/hda_codec.h
index 59991560d492..dd0d99d2ad27 100644
--- a/sound/pci/hda/hda_codec.h
+++ b/sound/pci/hda/hda_codec.h
@@ -262,6 +262,9 @@ enum {
 #define AC_PINCTL_OUT_EN                (1<<6)
 #define AC_PINCTL_HP_EN                 (1<<7)
 
+/* Unsolicited response - 8bit */
+#define AC_USRSP_EN                     (1<<7)
+
 /* configuration default - 32bit */
 #define AC_DEFCFG_SEQUENCE              (0xf<<0)
 #define AC_DEFCFG_DEF_ASSOC             (0xf<<4)
diff --git a/sound/pci/hda/patch_sigmatel.c b/sound/pci/hda/patch_sigmatel.c
index 07d06f7c4390..9d503da7320d 100644
--- a/sound/pci/hda/patch_sigmatel.c
+++ b/sound/pci/hda/patch_sigmatel.c
@@ -36,6 +36,10 @@
 
 #undef STAC_TEST
 
+#define NUM_CONTROL_ALLOC       32
+#define STAC_HP_EVENT           0x37
+#define STAC_UNSOL_ENABLE       (AC_USRSP_EN | STAC_HP_EVENT)
+
 struct sigmatel_spec {
         snd_kcontrol_new_t *mixers[4];
         unsigned int num_mixers;
@@ -507,8 +511,6 @@ static int stac92xx_build_pcms(struct hda_codec *codec)
         return 0;
 }
 
-#define NUM_CONTROL_ALLOC       32
-
 enum {
         STAC_CTL_WIDGET_VOL,
         STAC_CTL_WIDGET_MUTE,
@@ -617,10 +619,18 @@ static int stac92xx_auto_create_hp_ctls(struct hda_codec *codec, struct auto_pin
         hda_nid_t pin = cfg->hp_pin;
         hda_nid_t nid;
         int i, err;
+        unsigned int wid_caps;
 
         if (! pin)
                 return 0;
 
+        wid_caps = snd_hda_param_read(codec, pin, AC_PAR_AUDIO_WIDGET_CAP);
+        if (wid_caps & AC_WCAP_UNSOL_CAP)
+                /* Enable unsolicited responses on the HP widget */
+                snd_hda_codec_write(codec, pin, 0,
+                                AC_VERB_SET_UNSOLICITED_ENABLE,
+                                STAC_UNSOL_ENABLE);
+
         nid = snd_hda_codec_read(codec, pin, 0, AC_VERB_GET_CONNECT_LIST, 0) & 0xff;
         for (i = 0; i < cfg->line_outs; i++) {
                 if (! spec->multiout.dac_nids[i])
@@ -828,6 +838,53 @@ static void stac92xx_free(struct hda_codec *codec)
         kfree(spec);
 }
 
+static void stac92xx_set_pinctl(struct hda_codec *codec, hda_nid_t nid,
+                                unsigned int flag)
+{
+        unsigned int pin_ctl = snd_hda_codec_read(codec, nid,
+                        0, AC_VERB_GET_PIN_WIDGET_CONTROL, 0x00);
+        snd_hda_codec_write(codec, nid, 0,
+                        AC_VERB_SET_PIN_WIDGET_CONTROL,
+                        pin_ctl | flag);
+}
+
+static void stac92xx_reset_pinctl(struct hda_codec *codec, hda_nid_t nid,
+                                  unsigned int flag)
+{
+        unsigned int pin_ctl = snd_hda_codec_read(codec, nid,
+                        0, AC_VERB_GET_PIN_WIDGET_CONTROL, 0x00);
+        snd_hda_codec_write(codec, nid, 0,
+                        AC_VERB_SET_PIN_WIDGET_CONTROL,
+                        pin_ctl & ~flag);
+}
+
+static void stac92xx_unsol_event(struct hda_codec *codec, unsigned int res)
+{
+        struct sigmatel_spec *spec = codec->spec;
+        struct auto_pin_cfg *cfg = &spec->autocfg;
+        int i, presence;
+
+        if ((res >> 26) != STAC_HP_EVENT)
+                return;
+
+        presence = snd_hda_codec_read(codec, cfg->hp_pin, 0,
+                        AC_VERB_GET_PIN_SENSE, 0x00) >> 31;
+
+        if (presence) {
+                /* disable lineouts, enable hp */
+                for (i = 0; i < cfg->line_outs; i++)
+                        stac92xx_reset_pinctl(codec, cfg->line_out_pins[i],
+                                                AC_PINCTL_OUT_EN);
+                stac92xx_set_pinctl(codec, cfg->hp_pin, AC_PINCTL_OUT_EN);
+        } else {
+                /* enable lineouts, disable hp */
+                for (i = 0; i < cfg->line_outs; i++)
+                        stac92xx_set_pinctl(codec, cfg->line_out_pins[i],
+                                                AC_PINCTL_OUT_EN);
+                stac92xx_reset_pinctl(codec, cfg->hp_pin, AC_PINCTL_OUT_EN);
+        }
+} 
+
 #ifdef CONFIG_PM
 static int stac92xx_resume(struct hda_codec *codec)
 {
@@ -851,6 +908,7 @@ static struct hda_codec_ops stac92xx_patch_ops = {
         .build_pcms = stac92xx_build_pcms,
         .init = stac92xx_init,
         .free = stac92xx_free,
+        .unsol_event = stac92xx_unsol_event,
 #ifdef CONFIG_PM
         .resume = stac92xx_resume,
 #endif