[tegra ALSA] Support built-in speaker

Added support for built-in speaker. Although audio subsystem on
different boards have various topology, Tegra boards usually have
amplifier connected to codec. The patch added a control interface to
expose speaker control widget to user space. Amplifier could be driven
automatically if internal speaker turned on.

fixes bug 766757

Change-Id: Ic6b8d0c58830a71ff8d6c09d1268cbd97982d08b
Reviewed-on: http://git-master/r/21985
Reviewed-by: Chao Jiang <chaoj@nvidia.com>
Tested-by: Chao Jiang <chaoj@nvidia.com>
Reviewed-by: Scott Peterson <speterson@nvidia.com>

4 files changed, 107 insertions, 16 deletions

diff --git a/arch/arm/mach-tegra/include/mach/audio.h b/arch/arm/mach-tegra/include/mach/audio.h
index 49d5f5e41503..5e7f48e2ed18 100644
--- a/arch/arm/mach-tegra/include/mach/audio.h
+++ b/arch/arm/mach-tegra/include/mach/audio.h
@@ -58,6 +58,7 @@ struct tegra_wired_jack_conf {
 	int hp_det_n;   /* headphone jack detection gpio pin */
 	int en_mic_ext; /* external mic enable gpio pin */
 	int en_mic_int; /* internal mic enable gpio pin */
+	int en_spkr;    /* gpio pin to drive amplifier */
 };
 
 #endif /* __ARCH_ARM_MACH_TEGRA_AUDIO_H */
diff --git a/sound/soc/tegra/tegra_soc.h b/sound/soc/tegra/tegra_soc.h
index 215b4c580edb..ea3bf4a786d1 100644
--- a/sound/soc/tegra/tegra_soc.h
+++ b/sound/soc/tegra/tegra_soc.h
@@ -104,6 +104,13 @@ struct tegra_audio_data {
 	bool is_call_mode;
 };
 
+struct wired_jack_conf {
+	int hp_det_n;
+	int en_mic_int;
+	int en_mic_ext;
+	int en_spkr;
+};
+
 int tegra_controls_init(struct snd_soc_codec *codec);
 void tegra_controls_exit(void);
 
diff --git a/sound/soc/tegra/tegra_soc_controls.c b/sound/soc/tegra/tegra_soc_controls.c
index e076cf93b672..4371130e1081 100644
--- a/sound/soc/tegra/tegra_soc_controls.c
+++ b/sound/soc/tegra/tegra_soc_controls.c
@@ -18,21 +18,30 @@
  * 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
  */
 
+#include <linux/gpio.h>
+#include <sound/soc-dapm.h>
+#include <mach/audio.h>
 
 #include "tegra_soc.h"
 
-#include <mach/audio.h>
-
 #define TEGRA_HP	0
 #define TEGRA_MIC	1
 #define TEGRA_LINE	2
 #define TEGRA_HEADSET	3
 #define TEGRA_HP_OFF	4
-#define TEGRA_SPK_ON	0
-#define TEGRA_SPK_OFF	1
+
+#define TEGRA_LINEOUT_ON	0
+#define TEGRA_LINEOUT_OFF	1
+
+#define TEGRA_INT_SPK_ON	0
+#define TEGRA_INT_SPK_OFF	1
+
+extern struct wired_jack_conf tegra_wired_jack_conf;
 
 static struct tegra_audio_data *audio_data;
+
 static int tegra_jack_func;
+static int tegra_lineout_func;
 static int tegra_spk_func;
 
 static void tegra_ext_control(struct snd_soc_codec *codec)
@@ -67,11 +76,19 @@ static void tegra_ext_control(struct snd_soc_codec *codec)
 		break;
 	}
 
-	if (tegra_spk_func == TEGRA_SPK_ON) {
-		snd_soc_dapm_enable_pin(codec, "Ext Spk");
+
+	if (tegra_lineout_func == TEGRA_LINEOUT_ON) {
+		snd_soc_dapm_enable_pin(codec, "Lineout");
+	} else {
+		snd_soc_dapm_disable_pin(codec, "Lineout");
+	}
+
+	if (tegra_spk_func == TEGRA_INT_SPK_ON) {
+		snd_soc_dapm_enable_pin(codec, "Int Spk");
 	} else {
-		snd_soc_dapm_disable_pin(codec, "Ext Spk");
+		snd_soc_dapm_disable_pin(codec, "Int Spk");
 	}
+
 	/* signal a DAPM event */
 	snd_soc_dapm_sync(codec);
 }
@@ -96,6 +113,26 @@ static int tegra_set_jack(struct snd_kcontrol *kcontrol,
 	return 1;
 }
 
+static int tegra_get_lineout(struct snd_kcontrol *kcontrol,
+			     struct snd_ctl_elem_value *ucontrol)
+{
+	ucontrol->value.integer.value[0] = tegra_lineout_func;
+	return 0;
+}
+
+static int tegra_set_lineout(struct snd_kcontrol *kcontrol,
+			     struct snd_ctl_elem_value *ucontrol)
+{
+	struct snd_soc_codec *codec =  snd_kcontrol_chip(kcontrol);
+
+	if (tegra_lineout_func == ucontrol->value.integer.value[0])
+		return 0;
+
+	tegra_lineout_func = ucontrol->value.integer.value[0];
+	tegra_ext_control(codec);
+	return 1;
+}
+
 static int tegra_get_spk(struct snd_kcontrol *kcontrol,
 				struct snd_ctl_elem_value *ucontrol)
 {
@@ -117,11 +154,22 @@ static int tegra_set_spk(struct snd_kcontrol *kcontrol,
 	return 1;
 }
 
+static int tegra_dapm_event_int_spk(struct snd_soc_dapm_widget* w,
+				    struct snd_kcontrol* k, int event)
+{
+	if (tegra_wired_jack_conf.en_spkr != -1)
+		gpio_set_value_cansleep(tegra_wired_jack_conf.en_spkr,
+					SND_SOC_DAPM_EVENT_ON(event));
+
+	return 0;
+}
+
 /*tegra machine dapm widgets */
 static const struct snd_soc_dapm_widget tegra_dapm_widgets[] = {
 	SND_SOC_DAPM_HP("Headphone Jack", NULL),
 	SND_SOC_DAPM_MIC("Mic Jack", NULL),
-	SND_SOC_DAPM_SPK("Ext Spk", NULL),
+	SND_SOC_DAPM_SPK("Lineout", NULL),
+	SND_SOC_DAPM_SPK("Int Spk", tegra_dapm_event_int_spk),
 	SND_SOC_DAPM_LINE("Line Jack", NULL),
 	SND_SOC_DAPM_HP("Headset Jack", NULL),
 };
@@ -135,8 +183,15 @@ static const struct snd_soc_dapm_route audio_map[] = {
 	/* headphone connected to LHPOUT1, RHPOUT1 */
 	{"Headphone Jack", NULL, "HPOUTR"}, {"Headphone Jack", NULL, "HPOUTL"},
 
-	/* speaker connected to LOUT, ROUT */
-	{"Ext Spk", NULL, "LINEOUTR"}, {"Ext Spk", NULL, "LINEOUTL"},
+	/* build-in speaker connected to LON/P RON/P */
+	{"Int Spk", NULL, "RON"},
+	{"Int Spk", NULL, "ROP"},
+	{"Int Spk", NULL, "LON"},
+	{"Int Spk", NULL, "LOP"},
+
+	/* lineout connected to LINEOUTR and LINEOUTL */
+	{"Lineout", NULL, "LINEOUTR"},
+	{"Lineout", NULL, "LINEOUTL"},
 
 	/* mic is connected to MICIN (via right channel of headphone jack) */
 	{"IN1L", NULL, "Mic Jack"},
@@ -148,16 +203,21 @@ static const struct snd_soc_dapm_route audio_map[] = {
 static const char *jack_function[] = {"Headphone", "Mic", "Line", "Headset",
 					"Off"
 					};
+static const char *lineout_function[] = {"On", "Off"};
 static const char *spk_function[] = {"On", "Off"};
+
 static const struct soc_enum tegra_enum[] = {
 	SOC_ENUM_SINGLE_EXT(5, jack_function),
+	SOC_ENUM_SINGLE_EXT(2, lineout_function),
 	SOC_ENUM_SINGLE_EXT(2, spk_function),
 };
 
 static const struct snd_kcontrol_new tegra_controls[] = {
 	SOC_ENUM_EXT("Jack Function", tegra_enum[0], tegra_get_jack,
 			tegra_set_jack),
-	SOC_ENUM_EXT("Speaker Function", tegra_enum[1], tegra_get_spk,
+	SOC_ENUM_EXT("Lineout Function", tegra_enum[1], tegra_get_lineout,
+			tegra_set_lineout),
+	SOC_ENUM_EXT("Speaker Function", tegra_enum[2], tegra_get_spk,
 			tegra_set_spk),
 };
 
@@ -184,13 +244,16 @@ static void tegra_audio_route(int device_new, int is_call_mode_new)
 		}
 
 		if (play_device_new & TEGRA_AUDIO_DEVICE_OUT_SPEAKER) {
-			tegra_spk_func = TEGRA_SPK_ON;
+			tegra_lineout_func = TEGRA_LINEOUT_OFF;
+			tegra_spk_func = TEGRA_INT_SPK_ON;
 		}
 		else if (play_device_new & TEGRA_AUDIO_DEVICE_OUT_EAR_SPEAKER) {
-			tegra_spk_func = TEGRA_SPK_ON;
+			tegra_spk_func = TEGRA_INT_SPK_OFF;
+			tegra_lineout_func = TEGRA_LINEOUT_ON;
 		}
 		else {
-			tegra_spk_func = TEGRA_SPK_OFF;
+			tegra_lineout_func = TEGRA_LINEOUT_OFF;
+			tegra_spk_func = TEGRA_INT_SPK_OFF;
 		}
 		tegra_ext_control(audio_data->codec);
 		audio_data->play_device = play_device_new;
@@ -435,7 +498,8 @@ int tegra_controls_init(struct snd_soc_codec *codec)
 
 		/* Default to HP output */
 		tegra_jack_func = TEGRA_HP;
-		tegra_spk_func = TEGRA_SPK_ON;
+		tegra_lineout_func = TEGRA_LINEOUT_ON;
+		tegra_spk_func = TEGRA_INT_SPK_ON;
 		tegra_ext_control(codec);
 
 		snd_soc_dapm_sync(codec);
diff --git a/sound/soc/tegra/tegra_wired_jack.c b/sound/soc/tegra/tegra_wired_jack.c
index 7967caefce33..10fb237ce64a 100644
--- a/sound/soc/tegra/tegra_wired_jack.c
+++ b/sound/soc/tegra/tegra_wired_jack.c
@@ -19,6 +19,7 @@
  */
 
 #include <linux/types.h>
+#include <linux/gpio.h>
 #include <linux/switch.h>
 #include <linux/notifier.h>
 #include <sound/jack.h>
@@ -29,6 +30,10 @@
 
 #define HEAD_DET_GPIO 0
 
+struct wired_jack_conf tegra_wired_jack_conf = {
+	-1, -1, -1, -1
+};
+
 /* jack */
 static struct snd_soc_jack *tegra_wired_jack;
 
@@ -97,10 +102,11 @@ static int tegra_wired_jack_probe(struct platform_device *pdev)
 {
 	int ret;
 	int hp_det_n;
+	int en_spkr;
 	struct tegra_wired_jack_conf *pdata;
 
 	pdata = (struct tegra_wired_jack_conf *)pdev->dev.platform_data;
-	if (!pdata || !pdata->hp_det_n) {
+	if (!pdata || !pdata->hp_det_n || !pdata->en_spkr) {
 		pr_err("Please set up gpio pins for jack.\n");
 		return -EBUSY;
 	}
@@ -119,6 +125,19 @@ static int tegra_wired_jack_probe(struct platform_device *pdev)
 		return ret;
 	}
 
+	en_spkr = pdata->en_spkr;
+	ret = gpio_request(en_spkr, "en_spkr");
+	if (ret) {
+		pr_err("Could NOT set up gpio pin for amplifier.\n");
+		gpio_free(en_spkr);
+	}
+	gpio_direction_output(en_spkr, 0);
+	gpio_export(en_spkr, false);
+
+	/* restore configuration of these pins */
+	tegra_wired_jack_conf.hp_det_n = hp_det_n;
+	tegra_wired_jack_conf.en_spkr = en_spkr;
+
 	return 0;
 }