path: root/target/linux/brcm2708/patches-4.1/0048-Added-driver-for-HiFiBerry-Amp-amplifier-add-on-boar.patch

From e4f72f2ce26695642af17308eb52c676aac0cbf8 Mon Sep 17 00:00:00 2001
From: Daniel Matuschek <info@crazy-audio.com>
Date: Mon, 4 Aug 2014 11:09:58 +0200
Subject: [PATCH 048/171] Added driver for HiFiBerry Amp amplifier add-on board

The driver contains a low-level hardware driver for the TAS5713 and the
drivers for the Raspberry Pi I2S subsystem.

TAS5713: return error if initialisation fails

Existing TAS5713 driver logs errors during initialisation, but does not return
an error code. Therefore even if initialisation fails, the driver will still be
loaded, but won't work. This patch fixes this. I2C communication error will now
reported correctly by a non-zero return code.

HiFiBerry Amp: fix device-tree problems

Some code to load the driver based on device-tree-overlays was missing. This is added by this patch.
---
 arch/arm/mach-bcm2708/bcm2708.c |  19 +++
 sound/soc/bcm/Kconfig           |   7 +
 sound/soc/bcm/Makefile          |   2 +
 sound/soc/bcm/hifiberry_amp.c   | 127 ++++++++++++++
 sound/soc/codecs/Kconfig        |   4 +
 sound/soc/codecs/Makefile       |   2 +
 sound/soc/codecs/tas5713.c      | 369 ++++++++++++++++++++++++++++++++++++++++
 sound/soc/codecs/tas5713.h      | 210 +++++++++++++++++++++++
 8 files changed, 740 insertions(+)
 create mode 100644 sound/soc/bcm/hifiberry_amp.c
 create mode 100644 sound/soc/codecs/tas5713.c
 create mode 100644 sound/soc/codecs/tas5713.h

--- a/arch/arm/mach-bcm2708/bcm2708.c
+++ b/arch/arm/mach-bcm2708/bcm2708.c
@@ -681,6 +681,20 @@ static struct i2c_board_info __initdata
 
 #endif
 
+#if defined(CONFIG_SND_BCM2708_SOC_HIFIBERRY_AMP) || defined(CONFIG_SND_BCM2708_SOC_HIFIBERRY_AMP_MODULE)
+static struct platform_device snd_hifiberry_amp_device = {
+        .name = "snd-hifiberry-amp",
+        .id = 0,
+        .num_resources = 0,
+};
+
+static struct i2c_board_info __initdata snd_tas5713_i2c_devices[] = {
+        {
+                I2C_BOARD_INFO("tas5713", 0x1b)
+        },
+};
+#endif
+
 #if defined(CONFIG_SND_BCM2708_SOC_RPI_DAC) || defined(CONFIG_SND_BCM2708_SOC_RPI_DAC_MODULE)
 static struct platform_device snd_rpi_dac_device = {
         .name = "snd-rpi-dac",
@@ -894,6 +908,11 @@ void __init bcm2708_init(void)
         i2c_register_board_info_dt(1, snd_wm8804_i2c_devices, ARRAY_SIZE(snd_wm8804_i2c_devices));
 #endif
 
+#if defined(CONFIG_SND_BCM2708_SOC_HIFIBERRY_AMP) || defined(CONFIG_SND_BCM2708_SOC_HIFIBERRY_AMP_MODULE)
+        bcm_register_device_dt(&snd_hifiberry_amp_device);
+        i2c_register_board_info_dt(1, snd_tas5713_i2c_devices, ARRAY_SIZE(snd_tas5713_i2c_devices));
+#endif
+
 #if defined(CONFIG_SND_BCM2708_SOC_RPI_DAC) || defined(CONFIG_SND_BCM2708_SOC_RPI_DAC_MODULE)
         bcm_register_device_dt(&snd_rpi_dac_device);
         bcm_register_device_dt(&snd_pcm1794a_codec_device);
--- a/sound/soc/bcm/Kconfig
+++ b/sound/soc/bcm/Kconfig
@@ -40,6 +40,13 @@ config SND_BCM2708_SOC_HIFIBERRY_DIGI
         help
          Say Y or M if you want to add support for HifiBerry Digi S/PDIF output board.
 
+config SND_BCM2708_SOC_HIFIBERRY_AMP
+        tristate "Support for the HifiBerry Amp"
+        depends on SND_BCM2708_SOC_I2S || SND_BCM2835_SOC_I2S
+        select SND_SOC_TAS5713
+        help
+         Say Y or M if you want to add support for the HifiBerry Amp amplifier board.
+
 config SND_BCM2708_SOC_RPI_DAC
         tristate "Support for RPi-DAC"
         depends on SND_BCM2708_SOC_I2S || SND_BCM2835_SOC_I2S
--- a/sound/soc/bcm/Makefile
+++ b/sound/soc/bcm/Makefile
@@ -12,11 +12,13 @@ obj-$(CONFIG_SND_BCM2708_SOC_I2S) += snd
 snd-soc-hifiberry-dac-objs := hifiberry_dac.o
 snd-soc-hifiberry-dacplus-objs := hifiberry_dacplus.o
 snd-soc-hifiberry-digi-objs := hifiberry_digi.o
+snd-soc-hifiberry-amp-objs := hifiberry_amp.o
 snd-soc-rpi-dac-objs := rpi-dac.o
 snd-soc-iqaudio-dac-objs := iqaudio-dac.o
 
 obj-$(CONFIG_SND_BCM2708_SOC_HIFIBERRY_DAC) += snd-soc-hifiberry-dac.o
 obj-$(CONFIG_SND_BCM2708_SOC_HIFIBERRY_DACPLUS) += snd-soc-hifiberry-dacplus.o
 obj-$(CONFIG_SND_BCM2708_SOC_HIFIBERRY_DIGI) += snd-soc-hifiberry-digi.o
+obj-$(CONFIG_SND_BCM2708_SOC_HIFIBERRY_AMP) += snd-soc-hifiberry-amp.o
 obj-$(CONFIG_SND_BCM2708_SOC_RPI_DAC) += snd-soc-rpi-dac.o
 obj-$(CONFIG_SND_BCM2708_SOC_IQAUDIO_DAC) += snd-soc-iqaudio-dac.o
--- /dev/null
+++ b/sound/soc/bcm/hifiberry_amp.c
@@ -0,0 +1,127 @@
+/*
+ * ASoC Driver for HifiBerry AMP
+ *
+ * Author:	Sebastian Eickhoff <basti.eickhoff@googlemail.com>
+ *		Copyright 2014
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * version 2 as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * General Public License for more details.
+ */
+
+#include <linux/module.h>
+#include <linux/platform_device.h>
+
+#include <sound/core.h>
+#include <sound/pcm.h>
+#include <sound/pcm_params.h>
+#include <sound/soc.h>
+#include <sound/jack.h>
+
+static int snd_rpi_hifiberry_amp_init(struct snd_soc_pcm_runtime *rtd)
+{
+	// ToDo: init of the dsp-registers.
+	return 0;
+}
+
+static int snd_rpi_hifiberry_amp_hw_params( struct snd_pcm_substream *substream,
+				       struct snd_pcm_hw_params *params )
+{
+	struct snd_soc_pcm_runtime *rtd = substream->private_data;
+	struct snd_soc_dai *cpu_dai = rtd->cpu_dai;
+
+	return snd_soc_dai_set_bclk_ratio(cpu_dai, 64);
+}
+
+static struct snd_soc_ops snd_rpi_hifiberry_amp_ops = {
+	.hw_params = snd_rpi_hifiberry_amp_hw_params,
+};
+
+static struct snd_soc_dai_link snd_rpi_hifiberry_amp_dai[] = {
+    {
+		.name			= "HifiBerry AMP",
+		.stream_name	= "HifiBerry AMP HiFi",
+		.cpu_dai_name	= "bcm2708-i2s.0",
+		.codec_dai_name	= "tas5713-hifi",
+		.platform_name	= "bcm2708-i2s.0",
+		.codec_name		= "tas5713.1-001b",
+		.dai_fmt		= SND_SOC_DAIFMT_I2S |
+						  SND_SOC_DAIFMT_NB_NF |
+						  SND_SOC_DAIFMT_CBS_CFS,
+		.ops			= &snd_rpi_hifiberry_amp_ops,
+		.init			= snd_rpi_hifiberry_amp_init,
+	},
+};
+
+
+static struct snd_soc_card snd_rpi_hifiberry_amp = {
+	.name         = "snd_rpi_hifiberry_amp",
+	.dai_link     = snd_rpi_hifiberry_amp_dai,
+	.num_links    = ARRAY_SIZE(snd_rpi_hifiberry_amp_dai),
+};
+
+static const struct of_device_id snd_rpi_hifiberry_amp_of_match[] = {
+        { .compatible = "hifiberry,hifiberry-amp", },
+        {},
+};
+MODULE_DEVICE_TABLE(of, snd_rpi_hifiberry_amp_of_match);
+
+
+static int snd_rpi_hifiberry_amp_probe(struct platform_device *pdev)
+{
+	int ret = 0;
+
+	snd_rpi_hifiberry_amp.dev = &pdev->dev;
+
+        if (pdev->dev.of_node) {
+            struct device_node *i2s_node;
+            struct snd_soc_dai_link *dai = &snd_rpi_hifiberry_amp_dai[0];
+            i2s_node = of_parse_phandle(pdev->dev.of_node,
+                                        "i2s-controller", 0);
+
+            if (i2s_node) {
+                dai->cpu_dai_name = NULL;
+                dai->cpu_of_node = i2s_node;
+                dai->platform_name = NULL;
+                dai->platform_of_node = i2s_node;
+            }
+        }
+
+	ret = snd_soc_register_card(&snd_rpi_hifiberry_amp);
+
+	if (ret != 0) {
+		dev_err(&pdev->dev, "snd_soc_register_card() failed: %d\n", ret);
+	}
+
+	return ret;
+}
+
+
+static int snd_rpi_hifiberry_amp_remove(struct platform_device *pdev)
+{
+	return snd_soc_unregister_card(&snd_rpi_hifiberry_amp);
+}
+
+
+static struct platform_driver snd_rpi_hifiberry_amp_driver = {
+        .driver = {
+                .name   = "snd-hifiberry-amp",
+                .owner  = THIS_MODULE,
+		.of_match_table = snd_rpi_hifiberry_amp_of_match,
+        },
+        .probe          = snd_rpi_hifiberry_amp_probe,
+        .remove         = snd_rpi_hifiberry_amp_remove,
+};
+
+
+module_platform_driver(snd_rpi_hifiberry_amp_driver);
+
+
+MODULE_AUTHOR("Sebastian Eickhoff <basti.eickhoff@googlemail.com>");
+MODULE_DESCRIPTION("ASoC driver for HiFiBerry-AMP");
+MODULE_LICENSE("GPL v2");
--- a/sound/soc/codecs/Kconfig
+++ b/sound/soc/codecs/Kconfig
@@ -109,6 +109,7 @@ config SND_SOC_ALL_CODECS
 	select SND_SOC_TFA9879 if I2C
 	select SND_SOC_TLV320AIC23_I2C if I2C
 	select SND_SOC_TLV320AIC23_SPI if SPI_MASTER
+	select SND_SOC_TAS5713 if I2C
 	select SND_SOC_TLV320AIC26 if SPI_MASTER
 	select SND_SOC_TLV320AIC31XX if I2C
 	select SND_SOC_TLV320AIC32X4 if I2C
@@ -623,6 +624,9 @@ config SND_SOC_TFA9879
 	tristate "NXP Semiconductors TFA9879 amplifier"
 	depends on I2C
 
+config SND_SOC_TAS5713
+	tristate
+
 config SND_SOC_TLV320AIC23
 	tristate
 
--- a/sound/soc/codecs/Makefile
+++ b/sound/soc/codecs/Makefile
@@ -109,6 +109,7 @@ snd-soc-sta529-objs := sta529.o
 snd-soc-stac9766-objs := stac9766.o
 snd-soc-tas5086-objs := tas5086.o
 snd-soc-tfa9879-objs := tfa9879.o
+snd-soc-tas5713-objs := tas5713.o
 snd-soc-tlv320aic23-objs := tlv320aic23.o
 snd-soc-tlv320aic23-i2c-objs := tlv320aic23-i2c.o
 snd-soc-tlv320aic23-spi-objs := tlv320aic23-spi.o
@@ -293,6 +294,7 @@ obj-$(CONFIG_SND_SOC_STAC9766)	+= snd-so
 obj-$(CONFIG_SND_SOC_TAS2552)	+= snd-soc-tas2552.o
 obj-$(CONFIG_SND_SOC_TAS5086)	+= snd-soc-tas5086.o
 obj-$(CONFIG_SND_SOC_TFA9879)	+= snd-soc-tfa9879.o
+obj-$(CONFIG_SND_SOC_TAS5713)	+= snd-soc-tas5713.o
 obj-$(CONFIG_SND_SOC_TLV320AIC23)	+= snd-soc-tlv320aic23.o
 obj-$(CONFIG_SND_SOC_TLV320AIC23_I2C)	+= snd-soc-tlv320aic23-i2c.o
 obj-$(CONFIG_SND_SOC_TLV320AIC23_SPI)	+= snd-soc-tlv320aic23-spi.o
--- /dev/null
+++ b/sound/soc/codecs/tas5713.c
@@ -0,0 +1,369 @@
+/*
+ * ASoC Driver for TAS5713
+ *
+ * Author:	Sebastian Eickhoff <basti.eickhoff@googlemail.com>
+ *		Copyright 2014
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * version 2 as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * General Public License for more details.
+ */
+
+#include <linux/module.h>
+#include <linux/moduleparam.h>
+#include <linux/init.h>
+#include <linux/delay.h>
+#include <linux/pm.h>
+#include <linux/i2c.h>
+#include <linux/of_device.h>
+#include <linux/spi/spi.h>
+#include <linux/regmap.h>
+#include <linux/regulator/consumer.h>
+#include <linux/slab.h>
+#include <sound/core.h>
+#include <sound/pcm.h>
+#include <sound/pcm_params.h>
+#include <sound/soc.h>
+#include <sound/initval.h>
+#include <sound/tlv.h>
+
+#include <linux/kernel.h>
+#include <linux/string.h>
+#include <linux/fs.h>
+#include <asm/uaccess.h>
+
+#include "tas5713.h"
+
+
+static struct i2c_client *i2c;
+
+struct tas5713_priv {
+	struct regmap *regmap;
+	int mclk_div;
+	struct snd_soc_codec *codec;
+};
+
+static struct tas5713_priv *priv_data;
+
+
+
+
+/*
+ *    _   _    ___   _      ___         _           _
+ *   /_\ | |  / __| /_\    / __|___ _ _| |_ _ _ ___| |___
+ *  / _ \| |__\__ \/ _ \  | (__/ _ \ ' \  _| '_/ _ \ (_-<
+ * /_/ \_\____|___/_/ \_\  \___\___/_||_\__|_| \___/_/__/
+ *
+ */
+
+static const DECLARE_TLV_DB_SCALE(tas5713_vol_tlv, -10000, 50, 1);
+
+
+static const struct snd_kcontrol_new tas5713_snd_controls[] = {
+	SOC_SINGLE_TLV  ("Master"    , TAS5713_VOL_MASTER, 0, 248, 1, tas5713_vol_tlv),
+	SOC_DOUBLE_R_TLV("Channels"  , TAS5713_VOL_CH1, TAS5713_VOL_CH2, 0, 248, 1, tas5713_vol_tlv)
+};
+
+
+
+
+/*
+ *  __  __         _    _            ___      _
+ * |  \/  |__ _ __| |_ (_)_ _  ___  |   \ _ _(_)_ _____ _ _
+ * | |\/| / _` / _| ' \| | ' \/ -_) | |) | '_| \ V / -_) '_|
+ * |_|  |_\__,_\__|_||_|_|_||_\___| |___/|_| |_|\_/\___|_|
+ *
+ */
+
+static int tas5713_hw_params(struct snd_pcm_substream *substream,
+			    struct snd_pcm_hw_params *params,
+			    struct snd_soc_dai *dai)
+{
+	u16 blen = 0x00;
+
+	struct snd_soc_codec *codec;
+	codec = dai->codec;
+	priv_data->codec = dai->codec;
+
+	switch (params_format(params)) {
+	case SNDRV_PCM_FORMAT_S16_LE:
+		blen = 0x03;
+		break;
+	case SNDRV_PCM_FORMAT_S20_3LE:
+		blen = 0x1;
+		break;
+	case SNDRV_PCM_FORMAT_S24_LE:
+		blen = 0x04;
+		break;
+	case SNDRV_PCM_FORMAT_S32_LE:
+		blen = 0x05;
+		break;
+	default:
+		dev_err(dai->dev, "Unsupported word length: %u\n",
+			params_format(params));
+		return -EINVAL;
+	}
+
+	// set word length
+	snd_soc_update_bits(codec, TAS5713_SERIAL_DATA_INTERFACE, 0x7, blen);
+
+	return 0;
+}
+
+
+static int tas5713_mute_stream(struct snd_soc_dai *dai, int mute, int stream)
+{
+	unsigned int val = 0;
+
+	struct tas5713_priv *tas5713;
+	struct snd_soc_codec *codec = dai->codec;
+	tas5713 = snd_soc_codec_get_drvdata(codec);
+
+	if (mute) {
+		val = TAS5713_SOFT_MUTE_ALL;
+	}
+
+	return regmap_write(tas5713->regmap, TAS5713_SOFT_MUTE, val);
+}
+
+
+static const struct snd_soc_dai_ops tas5713_dai_ops = {
+	.hw_params 		= tas5713_hw_params,
+	.mute_stream	= tas5713_mute_stream,
+};
+
+
+static struct snd_soc_dai_driver tas5713_dai = {
+	.name		= "tas5713-hifi",
+	.playback 	= {
+		.stream_name	= "Playback",
+		.channels_min	= 2,
+		.channels_max	= 2,
+		.rates		    = SNDRV_PCM_RATE_8000_48000,
+		.formats	    = (SNDRV_PCM_FMTBIT_S16_LE | SNDRV_PCM_FMTBIT_S24_LE | SNDRV_PCM_FMTBIT_S32_LE ),
+	},
+	.ops        = &tas5713_dai_ops,
+};
+
+
+
+
+/*
+ *   ___         _          ___      _
+ *  / __|___  __| |___ __  |   \ _ _(_)_ _____ _ _
+ * | (__/ _ \/ _` / -_) _| | |) | '_| \ V / -_) '_|
+ *  \___\___/\__,_\___\__| |___/|_| |_|\_/\___|_|
+ *
+ */
+
+static int tas5713_remove(struct snd_soc_codec *codec)
+{
+	struct tas5713_priv *tas5713;
+
+	tas5713 = snd_soc_codec_get_drvdata(codec);
+
+	return 0;
+}
+
+
+static int tas5713_probe(struct snd_soc_codec *codec)
+{
+	struct tas5713_priv *tas5713;
+	int i, ret;
+
+	i2c = container_of(codec->dev, struct i2c_client, dev);
+
+	tas5713 = snd_soc_codec_get_drvdata(codec);
+
+	// Reset error
+	ret = snd_soc_write(codec, TAS5713_ERROR_STATUS, 0x00);
+	if (ret < 0) return ret;
+
+	// Trim oscillator
+	ret = snd_soc_write(codec, TAS5713_OSC_TRIM, 0x00);
+	if (ret < 0) return ret;
+	msleep(1000);
+
+	// Reset error
+	ret = snd_soc_write(codec, TAS5713_ERROR_STATUS, 0x00);
+	if (ret < 0) return ret;
+
+	// Clock mode: 44/48kHz, MCLK=64xfs
+	ret = snd_soc_write(codec, TAS5713_CLOCK_CTRL, 0x60);
+	if (ret < 0) return ret;
+
+	// I2S 24bit
+	ret = snd_soc_write(codec, TAS5713_SERIAL_DATA_INTERFACE, 0x05);
+	if (ret < 0) return ret;
+
+	// Unmute
+	ret = snd_soc_write(codec, TAS5713_SYSTEM_CTRL2, 0x00);
+	if (ret < 0) return ret;
+	ret = snd_soc_write(codec, TAS5713_SOFT_MUTE, 0x00);
+	if (ret < 0) return ret;
+
+	// Set volume to 0db
+	ret = snd_soc_write(codec, TAS5713_VOL_MASTER, 0x00);
+	if (ret < 0) return ret;
+
+	// Now start programming the default initialization sequence
+	for (i = 0; i < ARRAY_SIZE(tas5713_init_sequence); ++i) {
+		ret = i2c_master_send(i2c,
+				     tas5713_init_sequence[i].data,
+				     tas5713_init_sequence[i].size);
+		if (ret < 0) {
+			printk(KERN_INFO "TAS5713 CODEC PROBE: InitSeq returns: %d\n", ret);
+		}
+	}
+
+	// Unmute
+	ret = snd_soc_write(codec, TAS5713_SYSTEM_CTRL2, 0x00);
+	if (ret < 0) return ret;
+
+	return 0;
+}
+
+
+static struct snd_soc_codec_driver soc_codec_dev_tas5713 = {
+	.probe = tas5713_probe,
+	.remove = tas5713_remove,
+	.controls = tas5713_snd_controls,
+	.num_controls = ARRAY_SIZE(tas5713_snd_controls),
+};
+
+
+
+
+/*
+ *   ___ ___ ___   ___      _
+ *  |_ _|_  ) __| |   \ _ _(_)_ _____ _ _
+ *   | | / / (__  | |) | '_| \ V / -_) '_|
+ *  |___/___\___| |___/|_| |_|\_/\___|_|
+ *
+ */
+
+static const struct reg_default tas5713_reg_defaults[] = {
+	{ 0x07 ,0x80 },     // R7  - VOL_MASTER    - -40dB
+	{ 0x08 ,  30 },     // R8  - VOL_CH1	   -   0dB
+	{ 0x09 ,  30 },     // R9  - VOL_CH2       -   0dB
+	{ 0x0A ,0x80 },     // R10 - VOL_HEADPHONE - -40dB
+};
+
+
+static bool tas5713_reg_volatile(struct device *dev, unsigned int reg)
+{
+	switch (reg) {
+		case TAS5713_DEVICE_ID:
+		case TAS5713_ERROR_STATUS:
+			return true;
+	default:
+			return false;
+	}
+}
+
+
+static const struct of_device_id tas5713_of_match[] = {
+	{ .compatible = "ti,tas5713", },
+	{ }
+};
+MODULE_DEVICE_TABLE(of, tas5713_of_match);
+
+
+static struct regmap_config tas5713_regmap_config = {
+	.reg_bits = 8,
+	.val_bits = 8,
+
+	.max_register = TAS5713_MAX_REGISTER,
+	.volatile_reg = tas5713_reg_volatile,
+
+	.cache_type = REGCACHE_RBTREE,
+	.reg_defaults = tas5713_reg_defaults,
+	.num_reg_defaults = ARRAY_SIZE(tas5713_reg_defaults),
+};
+
+
+static int tas5713_i2c_probe(struct i2c_client *i2c,
+			    const struct i2c_device_id *id)
+{
+	int ret;
+
+	priv_data = devm_kzalloc(&i2c->dev, sizeof *priv_data, GFP_KERNEL);
+	if (!priv_data)
+		return -ENOMEM;
+
+	priv_data->regmap = devm_regmap_init_i2c(i2c, &tas5713_regmap_config);
+	if (IS_ERR(priv_data->regmap)) {
+		ret = PTR_ERR(priv_data->regmap);
+		return ret;
+	}
+
+	i2c_set_clientdata(i2c, priv_data);
+
+	ret = snd_soc_register_codec(&i2c->dev,
+				     &soc_codec_dev_tas5713, &tas5713_dai, 1);
+
+	return ret;
+}
+
+
+static int tas5713_i2c_remove(struct i2c_client *i2c)
+{
+	snd_soc_unregister_codec(&i2c->dev);
+	i2c_set_clientdata(i2c, NULL);
+
+	kfree(priv_data);
+
+	return 0;
+}
+
+
+static const struct i2c_device_id tas5713_i2c_id[] = {
+	{ "tas5713", 0 },
+	{ }
+};
+
+MODULE_DEVICE_TABLE(i2c, tas5713_i2c_id);
+
+
+static struct i2c_driver tas5713_i2c_driver = {
+	.driver = {
+		.name = "tas5713",
+		.owner = THIS_MODULE,
+		.of_match_table = tas5713_of_match,
+	},
+	.probe = tas5713_i2c_probe,
+	.remove = tas5713_i2c_remove,
+	.id_table = tas5713_i2c_id
+};
+
+
+static int __init tas5713_modinit(void)
+{
+	int ret = 0;
+
+	ret = i2c_add_driver(&tas5713_i2c_driver);
+	if (ret) {
+		printk(KERN_ERR "Failed to register tas5713 I2C driver: %d\n",
+		       ret);
+	}
+
+	return ret;
+}
+module_init(tas5713_modinit);
+
+
+static void __exit tas5713_exit(void)
+{
+	i2c_del_driver(&tas5713_i2c_driver);
+}
+module_exit(tas5713_exit);
+
+
+MODULE_AUTHOR("Sebastian Eickhoff <basti.eickhoff@googlemail.com>");
+MODULE_DESCRIPTION("ASoC driver for TAS5713");
+MODULE_LICENSE("GPL v2");
--- /dev/null
+++ b/sound/soc/codecs/tas5713.h
@@ -0,0 +1,210 @@
+/*
+ * ASoC Driver for TAS5713
+ *
+ * Author:      Sebastian Eickhoff <basti.eickhoff@googlemail.com>
+ *              Copyright 2014
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * version 2 as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * General Public License for more details.
+ */
+
+#ifndef _TAS5713_H
+#define _TAS5713_H
+
+
+// TAS5713 I2C-bus register addresses
+
+#define TAS5713_CLOCK_CTRL              0x00
+#define TAS5713_DEVICE_ID               0x01
+#define TAS5713_ERROR_STATUS            0x02
+#define TAS5713_SYSTEM_CTRL1            0x03
+#define TAS5713_SERIAL_DATA_INTERFACE   0x04
+#define TAS5713_SYSTEM_CTRL2            0x05
+#define TAS5713_SOFT_MUTE               0x06
+#define TAS5713_VOL_MASTER              0x07
+#define TAS5713_VOL_CH1                 0x08
+#define TAS5713_VOL_CH2                 0x09
+#define TAS5713_VOL_HEADPHONE           0x0A
+#define TAS5713_VOL_CONFIG              0x0E
+#define TAS5713_MODULATION_LIMIT        0x10
+#define TAS5713_IC_DLY_CH1              0x11
+#define TAS5713_IC_DLY_CH2              0x12
+#define TAS5713_IC_DLY_CH3              0x13
+#define TAS5713_IC_DLY_CH4              0x14
+
+#define TAS5713_START_STOP_PERIOD       0x1A
+#define TAS5713_OSC_TRIM                0x1B
+#define TAS5713_BKND_ERR                0x1C
+
+#define TAS5713_INPUT_MUX               0x20
+#define TAS5713_SRC_SELECT_CH4          0x21
+#define TAS5713_PWM_MUX                 0x25
+
+#define TAS5713_CH1_BQ0                 0x29
+#define TAS5713_CH1_BQ1                 0x2A
+#define TAS5713_CH1_BQ2                 0x2B
+#define TAS5713_CH1_BQ3                 0x2C
+#define TAS5713_CH1_BQ4                 0x2D
+#define TAS5713_CH1_BQ5                 0x2E
+#define TAS5713_CH1_BQ6                 0x2F
+#define TAS5713_CH1_BQ7                 0x58
+#define TAS5713_CH1_BQ8                 0x59
+
+#define TAS5713_CH2_BQ0                 0x30
+#define TAS5713_CH2_BQ1                 0x31
+#define TAS5713_CH2_BQ2                 0x32
+#define TAS5713_CH2_BQ3                 0x33
+#define TAS5713_CH2_BQ4                 0x34
+#define TAS5713_CH2_BQ5                 0x35
+#define TAS5713_CH2_BQ6                 0x36
+#define TAS5713_CH2_BQ7                 0x5C
+#define TAS5713_CH2_BQ8                 0x5D
+
+#define TAS5713_CH4_BQ0                 0x5A
+#define TAS5713_CH4_BQ1                 0x5B
+#define TAS5713_CH3_BQ0                 0x5E
+#define TAS5713_CH3_BQ1                 0x5F
+
+#define TAS5713_DRC1_SOFTENING_FILTER_ALPHA_OMEGA       0x3B
+#define TAS5713_DRC1_ATTACK_RELEASE_RATE                0x3C
+#define TAS5713_DRC2_SOFTENING_FILTER_ALPHA_OMEGA       0x3E
+#define TAS5713_DRC2_ATTACK_RELEASE_RATE                0x3F
+#define TAS5713_DRC1_ATTACK_RELEASE_THRES               0x40
+#define TAS5713_DRC2_ATTACK_RELEASE_THRES               0x43
+#define TAS5713_DRC_CTRL                                0x46
+
+#define TAS5713_BANK_SW_CTRL            0x50
+#define TAS5713_CH1_OUTPUT_MIXER        0x51
+#define TAS5713_CH2_OUTPUT_MIXER        0x52
+#define TAS5713_CH1_INPUT_MIXER         0x53
+#define TAS5713_CH2_INPUT_MIXER         0x54
+#define TAS5713_OUTPUT_POST_SCALE       0x56
+#define TAS5713_OUTPUT_PRESCALE         0x57
+
+#define TAS5713_IDF_POST_SCALE          0x62
+
+#define TAS5713_CH1_INLINE_MIXER        0x70
+#define TAS5713_CH1_INLINE_DRC_EN_MIXER 0x71
+#define TAS5713_CH1_R_CHANNEL_MIXER     0x72
+#define TAS5713_CH1_L_CHANNEL_MIXER     0x73
+#define TAS5713_CH2_INLINE_MIXER        0x74
+#define TAS5713_CH2_INLINE_DRC_EN_MIXER 0x75
+#define TAS5713_CH2_L_CHANNEL_MIXER     0x76
+#define TAS5713_CH2_R_CHANNEL_MIXER     0x77
+
+#define TAS5713_UPDATE_DEV_ADDR_KEY     0xF8
+#define TAS5713_UPDATE_DEV_ADDR_REG     0xF9
+
+#define TAS5713_REGISTER_COUNT          0x46
+#define TAS5713_MAX_REGISTER            0xF9
+
+
+// Bitmasks for registers
+#define TAS5713_SOFT_MUTE_ALL           0x07
+
+
+
+struct tas5713_init_command {
+        const int size;
+        const char *const data;
+};
+
+static const struct tas5713_init_command tas5713_init_sequence[] = {
+
+        // Trim oscillator
+    { .size = 2,  .data = "\x1B\x00" },
+    // System control register 1 (0x03): block DC
+    { .size = 2,  .data = "\x03\x80" },
+    // Mute everything
+    { .size = 2,  .data = "\x05\x40" },
+    // Modulation limit register (0x10): 97.7%
+    { .size = 2,  .data = "\x10\x02" },
+    // Interchannel delay registers
+    // (0x11, 0x12, 0x13, and 0x14): BD mode
+    { .size = 2,  .data = "\x11\xB8" },
+    { .size = 2,  .data = "\x12\x60" },
+    { .size = 2,  .data = "\x13\xA0" },
+    { .size = 2,  .data = "\x14\x48" },
+    // PWM shutdown group register (0x19): no shutdown
+    { .size = 2,  .data = "\x19\x00" },
+    // Input multiplexer register (0x20): BD mode
+    { .size = 2,  .data = "\x20\x00\x89\x77\x72" },
+    // PWM output mux register (0x25)
+    // Channel 1 --> OUTA, channel 1 neg --> OUTB
+    // Channel 2 --> OUTC, channel 2 neg --> OUTD
+    { .size = 5,  .data = "\x25\x01\x02\x13\x45" },
+    // DRC control (0x46): DRC off
+    { .size = 5,  .data = "\x46\x00\x00\x00\x00" },
+    // BKND_ERR register (0x1C): 299ms reset period
+    { .size = 2,  .data = "\x1C\x07" },
+    // Mute channel 3
+    { .size = 2,  .data = "\x0A\xFF" },
+    // Volume configuration register (0x0E): volume slew 512 steps
+    { .size = 2,  .data = "\x0E\x90" },
+    // Clock control register (0x00): 44/48kHz, MCLK=64xfs
+    { .size = 2,  .data = "\x00\x60" },
+    // Bank switch and eq control (0x50): no bank switching
+    { .size = 5,  .data = "\x50\x00\x00\x00\x00" },
+    // Volume registers (0x07, 0x08, 0x09, 0x0A)
+    { .size = 2,  .data = "\x07\x20" },
+    { .size = 2,  .data = "\x08\x30" },
+    { .size = 2,  .data = "\x09\x30" },
+    { .size = 2,  .data = "\x0A\xFF" },
+    // 0x72, 0x73, 0x76, 0x77 input mixer:
+    // no intermix between channels
+    { .size = 5,  .data = "\x72\x00\x00\x00\x00" },
+    { .size = 5,  .data = "\x73\x00\x80\x00\x00" },
+    { .size = 5,  .data = "\x76\x00\x00\x00\x00" },
+    { .size = 5,  .data = "\x77\x00\x80\x00\x00" },
+    // 0x70, 0x71, 0x74, 0x75 inline DRC mixer:
+    // no inline DRC inmix
+    { .size = 5,  .data = "\x70\x00\x80\x00\x00" },
+    { .size = 5,  .data = "\x71\x00\x00\x00\x00" },
+    { .size = 5,  .data = "\x74\x00\x80\x00\x00" },
+    { .size = 5,  .data = "\x75\x00\x00\x00\x00" },
+    // 0x56, 0x57 Output scale
+    { .size = 5,  .data = "\x56\x00\x80\x00\x00" },
+    { .size = 5,  .data = "\x57\x00\x02\x00\x00" },
+    // 0x3B, 0x3c
+    { .size = 9,  .data = "\x3B\x00\x08\x00\x00\x00\x78\x00\x00" },
+    { .size = 9,  .data = "\x3C\x00\x00\x01\x00\xFF\xFF\xFF\x00" },
+    { .size = 9,  .data = "\x3E\x00\x08\x00\x00\x00\x78\x00\x00" },
+    { .size = 9,  .data = "\x3F\x00\x00\x01\x00\xFF\xFF\xFF\x00" },
+    { .size = 9,  .data = "\x40\x00\x00\x01\x00\xFF\xFF\xFF\x00" },
+    { .size = 9,  .data = "\x43\x00\x00\x01\x00\xFF\xFF\xFF\x00" },
+    // 0x51, 0x52: output mixer
+    { .size = 9,  .data = "\x51\x00\x80\x00\x00\x00\x00\x00\x00" },
+    { .size = 9,  .data = "\x52\x00\x80\x00\x00\x00\x00\x00\x00" },
+    // PEQ defaults
+    { .size = 21,  .data = "\x29\x00\x80\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00" },
+    { .size = 21,  .data = "\x2A\x00\x80\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00" },
+    { .size = 21,  .data = "\x2B\x00\x80\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00" },
+    { .size = 21,  .data = "\x2C\x00\x80\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00" },
+    { .size = 21,  .data = "\x2D\x00\x80\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00" },
+    { .size = 21,  .data = "\x2E\x00\x80\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00" },
+    { .size = 21,  .data = "\x2F\x00\x80\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00" },
+    { .size = 21,  .data = "\x30\x00\x80\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00" },
+    { .size = 21,  .data = "\x31\x00\x80\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00" },
+    { .size = 21,  .data = "\x32\x00\x80\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00" },
+    { .size = 21,  .data = "\x33\x00\x80\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00" },
+    { .size = 21,  .data = "\x34\x00\x80\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00" },
+    { .size = 21,  .data = "\x35\x00\x80\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00" },
+    { .size = 21,  .data = "\x36\x00\x80\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00" },
+    { .size = 21,  .data = "\x58\x00\x80\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00" },
+    { .size = 21,  .data = "\x59\x00\x80\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00" },
+    { .size = 21,  .data = "\x5C\x00\x80\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00" },
+    { .size = 21,  .data = "\x5D\x00\x80\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00" },
+    { .size = 21,  .data = "\x5E\x00\x80\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00" },
+    { .size = 21,  .data = "\x5F\x00\x80\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00" },
+    { .size = 21,  .data = "\x5A\x00\x80\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00" },
+    { .size = 21,  .data = "\x5B\x00\x80\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00" },
+};
+
+
+#endif  /* _TAS5713_H */