[PATCH] Fix internal mic for Lenovo Ideapad U300s

[David Henningsson]

The internal mic input is phase inverted on one channel.
To avoid people in userspace summing the channels together
and get zero result, mute the right channel and make sure
they can't unmute it.

BugLink: https://bugs.launchpad.net/bugs/903853
Signed-off-by: David Henningsson <david.henningsson at canonical.com>
---
 sound/pci/hda/patch_conexant.c |   41 +++++++++++++++++++++++++++++----------
 1 files changed, 30 insertions(+), 11 deletions(-)

diff --git a/sound/pci/hda/patch_conexant.c b/sound/pci/hda/patch_conexant.c
index 266e5a6..4a05817 100644
--- a/sound/pci/hda/patch_conexant.c
+++ b/sound/pci/hda/patch_conexant.c
@@ -140,6 +140,7 @@ struct conexant_spec {
 	unsigned int asus:1;
 	unsigned int pin_eapd_ctrls:1;
 	unsigned int single_adc_amp:1;
+	unsigned int fixup_stereo_dmic:1;
 
 	unsigned int adc_switching:1;
 
@@ -4044,7 +4045,7 @@ static int cx_auto_init(struct hda_codec *codec)
 
 static int cx_auto_add_volume_idx(struct hda_codec *codec, const char *basename,
 			      const char *dir, int cidx,
-			      hda_nid_t nid, int hda_dir, int amp_idx)
+			      hda_nid_t nid, int hda_dir, int amp_idx, int chs)
 {
 	static char name[32];
 	static struct snd_kcontrol_new knew[] = {
@@ -4056,7 +4057,7 @@ static int cx_auto_add_volume_idx(struct hda_codec *codec, const char *basename,
 
 	for (i = 0; i < 2; i++) {
 		struct snd_kcontrol *kctl;
-		knew[i].private_value = HDA_COMPOSE_AMP_VAL(nid, 3, amp_idx,
+		knew[i].private_value = HDA_COMPOSE_AMP_VAL(nid, chs, amp_idx,
 							    hda_dir);
 		knew[i].subdevice = HDA_SUBDEV_AMP_FLAG;
 		knew[i].index = cidx;
@@ -4074,7 +4075,7 @@ static int cx_auto_add_volume_idx(struct hda_codec *codec, const char *basename,
 }
 
 #define cx_auto_add_volume(codec, str, dir, cidx, nid, hda_dir)		\
-	cx_auto_add_volume_idx(codec, str, dir, cidx, nid, hda_dir, 0)
+	cx_auto_add_volume_idx(codec, str, dir, cidx, nid, hda_dir, 0, 3)
 
 #define cx_auto_add_pb_volume(codec, nid, str, idx)			\
 	cx_auto_add_volume(codec, str, " Playback", idx, nid, HDA_OUTPUT)
@@ -4152,14 +4153,22 @@ static int cx_auto_add_capture_volume(struct hda_codec *codec, hda_nid_t nid,
 	int i;
 
 	for (i = 0; i < spec->num_adc_nids; i++) {
+		int chs = 3;
 		hda_nid_t adc_nid = spec->adc_nids[i];
 		int idx = get_input_connection(codec, adc_nid, nid);
 		if (idx < 0)
 			continue;
 		if (spec->single_adc_amp)
 			idx = 0;
+
+		if (spec->fixup_stereo_dmic && (strcmp("Internal Mic", label) == 0)) {
+			/* Make left channel controllable and right channel muted */
+			chs = 1;
+			snd_hda_codec_write_cache(codec, adc_nid, 0, AC_VERB_SET_AMP_GAIN_MUTE, 
+				AC_AMP_SET_RIGHT | AC_AMP_SET_INPUT | (idx << AC_AMP_SET_INDEX_SHIFT) | AC_AMP_MUTE);
+		}
 		return cx_auto_add_volume_idx(codec, label, pfx,
-					      cidx, adc_nid, HDA_INPUT, idx);
+					      cidx, adc_nid, HDA_INPUT, idx, chs);
 	}
 	return 0;
 }
@@ -4335,22 +4344,30 @@ static void apply_pincfg(struct hda_codec *codec, const struct cxt_pincfg *cfg)
 
 }
 
-static void apply_pin_fixup(struct hda_codec *codec,
+enum {
+	CXT_PINCFG_LENOVO_X200,
+	CXT_FIXUP_STEREO_DMIC,
+};
+
+static void apply_fixup(struct hda_codec *codec,
 			    const struct snd_pci_quirk *quirk,
 			    const struct cxt_pincfg **table)
 {
+	struct conexant_spec *spec = codec->spec;
+
 	quirk = snd_pci_quirk_lookup(codec->bus->pci, quirk);
-	if (quirk) {
+	if (quirk && table[quirk->value]) {
 		snd_printdd(KERN_INFO "hda_codec: applying pincfg for %s\n",
 			    quirk->name);
 		apply_pincfg(codec, table[quirk->value]);
 	}
+	if (quirk->value == CXT_FIXUP_STEREO_DMIC) {
+		snd_printdd(KERN_INFO "hda_codec: applying internal mic workaround for %s\n",
+			    quirk->name);
+		spec->fixup_stereo_dmic = 1;
+	}
 }
 
-enum {
-	CXT_PINCFG_LENOVO_X200,
-};
-
 static const struct cxt_pincfg cxt_pincfg_lenovo_x200[] = {
 	{ 0x16, 0x042140ff }, /* HP (seq# overridden) */
 	{ 0x17, 0x21a11000 }, /* dock-mic */
@@ -4360,10 +4377,12 @@ static const struct cxt_pincfg cxt_pincfg_lenovo_x200[] = {
 
 static const struct cxt_pincfg *cxt_pincfg_tbl[] = {
 	[CXT_PINCFG_LENOVO_X200] = cxt_pincfg_lenovo_x200,
+	[CXT_FIXUP_STEREO_DMIC] = NULL,
 };
 
 static const struct snd_pci_quirk cxt_fixups[] = {
 	SND_PCI_QUIRK(0x17aa, 0x20f2, "Lenovo X200", CXT_PINCFG_LENOVO_X200),
+	SND_PCI_QUIRK(0x17aa, 0x3975, "Lenovo U300s", CXT_FIXUP_STEREO_DMIC),
 	{}
 };
 
@@ -4387,7 +4406,7 @@ static int patch_conexant_auto(struct hda_codec *codec)
 		break;
 	}
 
-	apply_pin_fixup(codec, cxt_fixups, cxt_pincfg_tbl);
+	apply_fixup(codec, cxt_fixups, cxt_pincfg_tbl);
 
 	err = cx_auto_search_adcs(codec);
 	if (err < 0)
-- 
1.7.9


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