[tegra alsa] support digital mic on ventana

added code to support digital mic on wm8903 for ventana. By default
analog mic is enabled. To enable digital mic write 1 and to disable
 write 0 to
/sys/devices/platform/soc-audio/enable_digital_mic

Change-Id: I36e239d10404a9bc8446e275e5c59e9829409608
Reviewed-on: http://git-master/r/29615
Reviewed-by: Niket Sirsi <nsirsi@nvidia.com>
Tested-by: Niket Sirsi <nsirsi@nvidia.com>

4 files changed, 95 insertions, 1 deletions

diff --git a/arch/arm/mach-tegra/board-ventana.c b/arch/arm/mach-tegra/board-ventana.c
index 7f2f1c04bc7b..329fb7c65a46 100644
--- a/arch/arm/mach-tegra/board-ventana.c
+++ b/arch/arm/mach-tegra/board-ventana.c
@@ -417,6 +417,7 @@ static struct tegra_audio_platform_data tegra_audio_pdata[] = {
 		.bit_size	= I2S_BIT_SIZE_16,
 		.i2s_bus_width = 32,
 		.dsp_bus_width = 16,
+		.en_dmic = false, /* by default analog mic is used */
 	},
 	/* For I2S2 */
 	[1] = {
diff --git a/arch/arm/mach-tegra/include/mach/audio.h b/arch/arm/mach-tegra/include/mach/audio.h
index 4d7c58afb287..6b526e96f8ac 100644
--- a/arch/arm/mach-tegra/include/mach/audio.h
+++ b/arch/arm/mach-tegra/include/mach/audio.h
@@ -56,6 +56,7 @@ struct tegra_audio_platform_data {
 	int dsp_bus_width; /* 16-bit for DSP data format */
 	int mask; /* enable tx and rx? */
 	bool stereo_capture; /* True if hardware supports stereo */
+	bool en_dmic; /* True if digital mic is default*/
 	void *driver_data;
 };
 
diff --git a/sound/soc/tegra/tegra_i2s.c b/sound/soc/tegra/tegra_i2s.c
index 1f40cff697d8..ee197165dc9d 100644
--- a/sound/soc/tegra/tegra_i2s.c
+++ b/sound/soc/tegra/tegra_i2s.c
@@ -19,6 +19,8 @@
 
 #include "tegra_soc.h"
 
+int en_dmic;
+
 /* i2s controller */
 struct tegra_i2s_info {
 	struct platform_device *pdev;
@@ -294,6 +296,9 @@ static int i2s_configure(struct tegra_i2s_info *info )
 	i2s_set_bit_size(i2s_id, pdata->bit_size);
 	i2s_set_fifo_format(i2s_id, pdata->fifo_fmt);
 
+	if (i2s_id == 0)
+		en_dmic = pdata->en_dmic;
+
 	return 0;
 }
 
diff --git a/sound/soc/tegra/tegra_soc_wm8903.c b/sound/soc/tegra/tegra_soc_wm8903.c
index 59fc6ddd0c9a..efad1e607e9d 100644
--- a/sound/soc/tegra/tegra_soc_wm8903.c
+++ b/sound/soc/tegra/tegra_soc_wm8903.c
@@ -19,10 +19,13 @@
 #include <linux/gpio.h>
 #include <sound/soc-dapm.h>
 #include <linux/regulator/consumer.h>
+#include <linux/sysfs.h>
 #include "../codecs/wm8903.h"
 
 static struct platform_device *tegra_snd_device;
 
+extern int en_dmic;
+
 extern struct snd_soc_dai tegra_i2s_dai[];
 extern struct snd_soc_dai tegra_spdif_dai;
 extern struct snd_soc_dai tegra_generic_codec_dai[];
@@ -47,8 +50,81 @@ extern struct wired_jack_conf tegra_wired_jack_conf;
 #define B04_ADC_HPF_ENA		4
 #define R20_SIDETONE_CTRL	32
 #define R29_DRC_1		41
+
+#define B08_GPx_FN		8
+#define B07_GPx_DIR		7
+
+#define DMIC_CLK_OUT		(0x6 << B08_GPx_FN)
+#define DMIC_DAT_DATA_IN	(0x6 << B08_GPx_FN)
+#define GPIO_DIR_OUT		(0x0 << B07_GPx_DIR)
+#define GPIO_DIR_IN			(0x1 << B07_GPx_DIR)
+
+#define ADC_DIGITAL_VOL_9DB		0x1D8
+#define ADC_DIGITAL_VOL_12DB	0x1E0
+#define ADC_ANALOG_VOLUME		0x1C
+#define DRC_MAX_36DB			0x03
+
 #define SET_REG_VAL(r,m,l,v) (((r)&(~((m)<<(l))))|(((v)&(m))<<(l)))
 
+static ssize_t digital_mic_show(struct device *dev,
+				struct device_attribute *attr,
+				char *buf)
+{
+	return sprintf(buf, "%d\n", en_dmic);
+}
+
+static ssize_t digital_mic_store(struct device *dev,
+				struct device_attribute *attr,
+				const char *buf, size_t count)
+{
+	if (count > 3) {
+		pr_err("%s: buffer size %d too big\n", __func__, count);
+		return -EINVAL;
+	}
+
+	if (sscanf(buf, "%d", &en_dmic) != 1) {
+		pr_err("%s: invalid input string [%s]\n", __func__, buf);
+		return -EINVAL;
+	}
+	return count;
+}
+
+static DEVICE_ATTR(enable_digital_mic, 0644, digital_mic_show, digital_mic_store);
+
+static void configure_dmic(struct snd_soc_codec *codec)
+{
+	u16 test4, reg;
+
+	if (en_dmic) {
+		/* Set GP1_FN as DMIC_LR */
+		snd_soc_write(codec, WM8903_GPIO_CONTROL_1,
+					DMIC_CLK_OUT | GPIO_DIR_OUT);
+
+		/* Set GP2_FN as DMIC_DAT */
+		snd_soc_write(codec, WM8903_GPIO_CONTROL_2,
+					DMIC_DAT_DATA_IN | GPIO_DIR_IN);
+
+		/* Enable ADC Digital volumes */
+		snd_soc_write(codec, WM8903_ADC_DIGITAL_VOLUME_LEFT,
+					ADC_DIGITAL_VOL_9DB);
+		snd_soc_write(codec, WM8903_ADC_DIGITAL_VOLUME_RIGHT,
+					ADC_DIGITAL_VOL_9DB);
+
+		/* Enable DIG_MIC */
+		test4 = WM8903_ADC_DIG_MIC;
+	} else {
+		/* Disable DIG_MIC */
+		test4 = snd_soc_read(codec, WM8903_CLOCK_RATE_TEST_4);
+		test4 &= ~WM8903_ADC_DIG_MIC;
+	}
+
+	reg = snd_soc_read(codec, WM8903_CONTROL_INTERFACE_TEST_1);
+	snd_soc_write(codec, WM8903_CONTROL_INTERFACE_TEST_1,
+			 reg | WM8903_TEST_KEY);
+	snd_soc_write(codec, WM8903_CLOCK_RATE_TEST_4, test4);
+	snd_soc_write(codec, WM8903_CONTROL_INTERFACE_TEST_1, reg);
+
+}
 
 static int tegra_hifi_hw_params(struct snd_pcm_substream *substream,
 					struct snd_pcm_hw_params *params)
@@ -104,7 +180,6 @@ static int tegra_hifi_hw_params(struct snd_pcm_substream *substream,
 		int CtrlReg = 0;
 		int VolumeCtrlReg = 0;
 		int SidetoneCtrlReg = 0;
-		int SideToneAtenuation = 0;
 
 		snd_soc_write(codec, WM8903_ANALOGUE_LEFT_INPUT_0, 0X7);
 		snd_soc_write(codec, WM8903_ANALOGUE_RIGHT_INPUT_0, 0X7);
@@ -149,6 +224,9 @@ static int tegra_hifi_hw_params(struct snd_pcm_substream *substream,
 		CtrlReg = snd_soc_read(codec, R29_DRC_1);
 		CtrlReg |= 0x3; /*mic volume 18 db */
 		snd_soc_write(codec, R29_DRC_1, CtrlReg);
+
+		configure_dmic(codec);
+
 	}
 
 	return 0;
@@ -530,6 +608,15 @@ static int __init tegra_init(void)
 		goto fail;
 	}
 
+	ret = device_create_file(&tegra_snd_device->dev,
+							&dev_attr_enable_digital_mic);
+	if (ret < 0) {
+		dev_err(&tegra_snd_device->dev,
+				"%s: could not create sysfs entry %s: %d\n",
+				__func__, dev_attr_enable_digital_mic.attr.name, ret);
+		return ret;
+	}
+
 	return 0;
 
 fail: