ALSA: ASoC: add codec driver for TI TAS5086

This patch adds a driver for TI's TA5086 6-channel PWM processor.

This chip has a very unusual register layout, specifically because the
registers are of unequal size, and multi-byte registers require bulk
writes to take effect. Regmap does not support these kind of mappings.

Currently, the driver does not touch any of the registers >= 0x20, so
it doesn't matter, because the register map is mapped to an 8-bit array.
In case more features will be added in the future that require access
to higher registers, the entire regmap H/W I/O routines have to be
open-coded.

Signed-off-by: Daniel Mack <zonque@gmail.com>
Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>

5 files changed, 646 insertions, 0 deletions

diff --git a/Documentation/devicetree/bindings/sound/ti,tas5086.txt b/Documentation/devicetree/bindings/sound/ti,tas5086.txt
new file mode 100644
index 000000000000..8ea4f5b4818d
--- /dev/null
+++ b/Documentation/devicetree/bindings/sound/ti,tas5086.txt
@@ -0,0 +1,32 @@
+Texas Instruments TAS5086 6-channel PWM Processor
+
+Required properties:
+
+ - compatible:          Should contain "ti,tas5086".
+ - reg:                 The i2c address. Should contain <0x1b>.
+
+Optional properties:
+
+ - reset-gpio:          A GPIO spec to define which pin is connected to the
+                        chip's !RESET pin. If specified, the driver will
+                        assert a hardware reset at probe time.
+
+ - ti,charge-period:    This property should contain the time in microseconds
+                        that closely matches the external single-ended
+                        split-capacitor charge period. The hardware chip
+                        waits for this period of time before starting the
+                        PWM signals. This helps reduce pops and clicks.
+
+                        When not specified, the hardware default of 1300ms
+                        is retained.
+
+Examples:
+
+        i2c_bus {
+                tas5086@1b {
+                        compatible = "ti,tas5086";
+                        reg = <0x1b>;
+                        reset-gpio = <&gpio 23 0>;
+                        ti,charge-period = <156000>;
+                };
+        };
diff --git a/include/sound/tas5086.h b/include/sound/tas5086.h
new file mode 100644
index 000000000000..aac481b7db8f
--- /dev/null
+++ b/include/sound/tas5086.h
@@ -0,0 +1,7 @@
+#ifndef _SND_SOC_CODEC_TAS5086_H_
+#define _SND_SOC_CODEC_TAS5086_H_
+
+#define TAS5086_CLK_IDX_MCLK    0
+#define TAS5086_CLK_IDX_SCLK    1
+
+#endif /* _SND_SOC_CODEC_TAS5086_H_ */
diff --git a/sound/soc/codecs/Kconfig b/sound/soc/codecs/Kconfig
index 45b72561c615..86b35245e559 100644
--- a/sound/soc/codecs/Kconfig
+++ b/sound/soc/codecs/Kconfig
@@ -63,6 +63,7 @@ config SND_SOC_ALL_CODECS
         select SND_SOC_STA32X if I2C
         select SND_SOC_STA529 if I2C
         select SND_SOC_STAC9766 if SND_SOC_AC97_BUS
+        select SND_SOC_TAS5086 if I2C
         select SND_SOC_TLV320AIC23 if I2C
         select SND_SOC_TLV320AIC26 if SPI_MASTER
         select SND_SOC_TLV320AIC32X4 if I2C
@@ -320,6 +321,9 @@ config SND_SOC_STA529
 config SND_SOC_STAC9766
         tristate
 
+config SND_SOC_TAS5086
+        tristate
+
 config SND_SOC_TLV320AIC23
         tristate
 
diff --git a/sound/soc/codecs/Makefile b/sound/soc/codecs/Makefile
index 6a3b3c3b8b41..8077bc2b4f43 100644
--- a/sound/soc/codecs/Makefile
+++ b/sound/soc/codecs/Makefile
@@ -55,6 +55,7 @@ snd-soc-ssm2602-objs := ssm2602.o
 snd-soc-sta32x-objs := sta32x.o
 snd-soc-sta529-objs := sta529.o
 snd-soc-stac9766-objs := stac9766.o
+snd-soc-tas5086-objs := tas5086.o
 snd-soc-tlv320aic23-objs := tlv320aic23.o
 snd-soc-tlv320aic26-objs := tlv320aic26.o
 snd-soc-tlv320aic3x-objs := tlv320aic3x.o
@@ -177,6 +178,7 @@ obj-$(CONFIG_SND_SOC_SSM2602)	+= snd-soc-ssm2602.o
 obj-$(CONFIG_SND_SOC_STA32X)   += snd-soc-sta32x.o
 obj-$(CONFIG_SND_SOC_STA529)   += snd-soc-sta529.o
 obj-$(CONFIG_SND_SOC_STAC9766)  += snd-soc-stac9766.o
+obj-$(CONFIG_SND_SOC_TAS5086)   += snd-soc-tas5086.o
 obj-$(CONFIG_SND_SOC_TLV320AIC23)       += snd-soc-tlv320aic23.o
 obj-$(CONFIG_SND_SOC_TLV320AIC26)       += snd-soc-tlv320aic26.o
 obj-$(CONFIG_SND_SOC_TLV320AIC3X)       += snd-soc-tlv320aic3x.o
diff --git a/sound/soc/codecs/tas5086.c b/sound/soc/codecs/tas5086.c
new file mode 100644
index 000000000000..008bea4d6208
--- /dev/null
+++ b/sound/soc/codecs/tas5086.c
@@ -0,0 +1,601 @@
+/*
+ * TAS5086 ASoC codec driver
+ *
+ * Copyright (c) 2013 Daniel Mack <zonque@gmail.com>
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version 2
+ * of the License, or (at your option) any later version.
+ *
+ * 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.
+ *
+ * TODO:
+ *  - implement DAPM and input muxing
+ *  - implement modulation limit
+ *  - implement non-default PWM start
+ *
+ * Note that this chip has a very unusual register layout, specifically
+ * because the registers are of unequal size, and multi-byte registers
+ * require bulk writes to take effect. Regmap does not support that kind
+ * of devices.
+ *
+ * Currently, the driver does not touch any of the registers >= 0x20, so
+ * it doesn't matter because the entire map can be accessed as 8-bit
+ * array. In case more features will be added in the future
+ * that require access to higher registers, the entire regmap H/W I/O
+ * routines have to be open-coded.
+ */
+
+#include <linux/module.h>
+#include <linux/slab.h>
+#include <linux/delay.h>
+#include <linux/gpio.h>
+#include <linux/i2c.h>
+#include <linux/regmap.h>
+#include <linux/spi/spi.h>
+#include <linux/of_device.h>
+#include <linux/of_gpio.h>
+#include <sound/pcm.h>
+#include <sound/pcm_params.h>
+#include <sound/soc.h>
+#include <sound/tlv.h>
+#include <sound/tas5086.h>
+
+#define TAS5086_PCM_FORMATS (SNDRV_PCM_FMTBIT_S16_LE  |         \
+                             SNDRV_PCM_FMTBIT_S20_3LE |         \
+                             SNDRV_PCM_FMTBIT_S24_3LE)
+
+#define TAS5086_PCM_RATES   (SNDRV_PCM_RATE_32000 | SNDRV_PCM_RATE_44100  | \
+                             SNDRV_PCM_RATE_48000 | SNDRV_PCM_RATE_88200  | \
+                             SNDRV_PCM_RATE_96000 | SNDRV_PCM_RATE_176400 | \
+                             SNDRV_PCM_RATE_192000)
+
+/*
+ * TAS5086 registers
+ */
+#define TAS5086_CLOCK_CONTROL           0x00    /* Clock control register  */
+#define TAS5086_CLOCK_RATE(val)         (val << 5)
+#define TAS5086_CLOCK_RATE_MASK         (0x7 << 5)
+#define TAS5086_CLOCK_RATIO(val)        (val << 2)
+#define TAS5086_CLOCK_RATIO_MASK        (0x7 << 2)
+#define TAS5086_CLOCK_SCLK_RATIO_48     (1 << 1)
+#define TAS5086_CLOCK_VALID             (1 << 0)
+
+#define TAS5086_DEEMPH_MASK             0x03
+#define TAS5086_SOFT_MUTE_ALL           0x3f
+
+#define TAS5086_DEV_ID                  0x01    /* Device ID register */
+#define TAS5086_ERROR_STATUS            0x02    /* Error status register */
+#define TAS5086_SYS_CONTROL_1           0x03    /* System control register 1 */
+#define TAS5086_SERIAL_DATA_IF          0x04    /* Serial data interface register  */
+#define TAS5086_SYS_CONTROL_2           0x05    /* System control register 2 */
+#define TAS5086_SOFT_MUTE               0x06    /* Soft mute register */
+#define TAS5086_MASTER_VOL              0x07    /* Master volume  */
+#define TAS5086_CHANNEL_VOL(X)          (0x08 + (X))    /* Channel 1-6 volume */
+#define TAS5086_VOLUME_CONTROL          0x09    /* Volume control register */
+#define TAS5086_MOD_LIMIT               0x10    /* Modulation limit register */
+#define TAS5086_PWM_START               0x18    /* PWM start register */
+#define TAS5086_SURROUND                0x19    /* Surround register */
+#define TAS5086_SPLIT_CAP_CHARGE        0x1a    /* Split cap charge period register */
+#define TAS5086_OSC_TRIM                0x1b    /* Oscillator trim register */
+#define TAS5086_BKNDERR                 0x1c
+
+/*
+ * Default TAS5086 power-up configuration
+ */
+static const struct reg_default tas5086_reg_defaults[] = {
+        { 0x00, 0x6c },
+        { 0x01, 0x03 },
+        { 0x02, 0x00 },
+        { 0x03, 0xa0 },
+        { 0x04, 0x05 },
+        { 0x05, 0x60 },
+        { 0x06, 0x00 },
+        { 0x07, 0xff },
+        { 0x08, 0x30 },
+        { 0x09, 0x30 },
+        { 0x0a, 0x30 },
+        { 0x0b, 0x30 },
+        { 0x0c, 0x30 },
+        { 0x0d, 0x30 },
+        { 0x0e, 0xb1 },
+        { 0x0f, 0x00 },
+        { 0x10, 0x02 },
+        { 0x11, 0x00 },
+        { 0x12, 0x00 },
+        { 0x13, 0x00 },
+        { 0x14, 0x00 },
+        { 0x15, 0x00 },
+        { 0x16, 0x00 },
+        { 0x17, 0x00 },
+        { 0x18, 0x3f },
+        { 0x19, 0x00 },
+        { 0x1a, 0x18 },
+        { 0x1b, 0x82 },
+        { 0x1c, 0x05 },
+};
+
+static bool tas5086_accessible_reg(struct device *dev, unsigned int reg)
+{
+        return !((reg == 0x0f) || (reg >= 0x11 && reg <= 0x17));
+}
+
+static bool tas5086_volatile_reg(struct device *dev, unsigned int reg)
+{
+        switch (reg) {
+        case TAS5086_DEV_ID:
+        case TAS5086_ERROR_STATUS:
+                return true;
+        }
+
+        return false;
+}
+
+static bool tas5086_writeable_reg(struct device *dev, unsigned int reg)
+{
+        return tas5086_accessible_reg(dev, reg) && (reg != TAS5086_DEV_ID);
+}
+
+struct tas5086_private {
+        struct regmap   *regmap;
+        unsigned int    mclk, sclk;
+        unsigned int    format;
+        bool            deemph;
+        /* Current sample rate for de-emphasis control */
+        int             rate;
+        /* GPIO driving Reset pin, if any */
+        int             gpio_nreset;
+};
+
+static int tas5086_deemph[] = { 0, 32000, 44100, 48000 };
+
+static int tas5086_set_deemph(struct snd_soc_codec *codec)
+{
+        struct tas5086_private *priv = snd_soc_codec_get_drvdata(codec);
+        int i, val = 0;
+
+        if (priv->deemph)
+                for (i = 0; i < ARRAY_SIZE(tas5086_deemph); i++)
+                        if (tas5086_deemph[i] == priv->rate)
+                                val = i;
+
+        return regmap_update_bits(priv->regmap, TAS5086_SYS_CONTROL_1,
+                                  TAS5086_DEEMPH_MASK, val);
+}
+
+static int tas5086_get_deemph(struct snd_kcontrol *kcontrol,
+                              struct snd_ctl_elem_value *ucontrol)
+{
+        struct snd_soc_codec *codec = snd_kcontrol_chip(kcontrol);
+        struct tas5086_private *priv = snd_soc_codec_get_drvdata(codec);
+
+        ucontrol->value.enumerated.item[0] = priv->deemph;
+
+        return 0;
+}
+
+static int tas5086_put_deemph(struct snd_kcontrol *kcontrol,
+                              struct snd_ctl_elem_value *ucontrol)
+{
+        struct snd_soc_codec *codec = snd_kcontrol_chip(kcontrol);
+        struct tas5086_private *priv = snd_soc_codec_get_drvdata(codec);
+
+        priv->deemph = ucontrol->value.enumerated.item[0];
+
+        return tas5086_set_deemph(codec);
+}
+
+
+static int tas5086_set_dai_sysclk(struct snd_soc_dai *codec_dai,
+                                  int clk_id, unsigned int freq, int dir)
+{
+        struct snd_soc_codec *codec = codec_dai->codec;
+        struct tas5086_private *priv = snd_soc_codec_get_drvdata(codec);
+
+        switch (clk_id) {
+        case TAS5086_CLK_IDX_MCLK:
+                priv->mclk = freq;
+                break;
+        case TAS5086_CLK_IDX_SCLK:
+                priv->sclk = freq;
+                break;
+        }
+
+        return 0;
+}
+
+static int tas5086_set_dai_fmt(struct snd_soc_dai *codec_dai,
+                               unsigned int format)
+{
+        struct snd_soc_codec *codec = codec_dai->codec;
+        struct tas5086_private *priv = snd_soc_codec_get_drvdata(codec);
+
+        /* The TAS5086 can only be slave to all clocks */
+        if ((format & SND_SOC_DAIFMT_MASTER_MASK) != SND_SOC_DAIFMT_CBS_CFS) {
+                dev_err(codec->dev, "Invalid clocking mode\n");
+                return -EINVAL;
+        }
+
+        /* we need to refer to the data format from hw_params() */
+        priv->format = format;
+
+        return 0;
+}
+
+static const int tas5086_sample_rates[] = {
+        32000, 38000, 44100, 48000, 88200, 96000, 176400, 192000
+};
+
+static const int tas5086_ratios[] = {
+        64, 128, 192, 256, 384, 512
+};
+
+static int index_in_array(const int *array, int len, int needle)
+{
+        int i;
+
+        for (i = 0; i < len; i++)
+                if (array[i] == needle)
+                        return i;
+
+        return -ENOENT;
+}
+
+static int tas5086_hw_params(struct snd_pcm_substream *substream,
+                             struct snd_pcm_hw_params *params,
+                             struct snd_soc_dai *dai)
+{
+        struct snd_soc_codec *codec = dai->codec;
+        struct tas5086_private *priv = snd_soc_codec_get_drvdata(codec);
+        unsigned int val;
+        int ret;
+
+        priv->rate = params_rate(params);
+
+        /* Look up the sample rate and refer to the offset in the list */
+        val = index_in_array(tas5086_sample_rates,
+                             ARRAY_SIZE(tas5086_sample_rates), priv->rate);
+
+        if (val < 0) {
+                dev_err(codec->dev, "Invalid sample rate\n");
+                return -EINVAL;
+        }
+
+        ret = regmap_update_bits(priv->regmap, TAS5086_CLOCK_CONTROL,
+                                 TAS5086_CLOCK_RATE_MASK,
+                                 TAS5086_CLOCK_RATE(val));
+        if (ret < 0)
+                return ret;
+
+        /* MCLK / Fs ratio */
+        val = index_in_array(tas5086_ratios, ARRAY_SIZE(tas5086_ratios),
+                             priv->mclk / priv->rate);
+        if (val < 0) {
+                dev_err(codec->dev, "Inavlid MCLK / Fs ratio\n");
+                return -EINVAL;
+        }
+
+        ret = regmap_update_bits(priv->regmap, TAS5086_CLOCK_CONTROL,
+                                 TAS5086_CLOCK_RATIO_MASK,
+                                 TAS5086_CLOCK_RATIO(val));
+        if (ret < 0)
+                return ret;
+
+
+        ret = regmap_update_bits(priv->regmap, TAS5086_CLOCK_CONTROL,
+                                 TAS5086_CLOCK_SCLK_RATIO_48,
+                                 (priv->sclk == 48 * priv->rate) ? 
+                                        TAS5086_CLOCK_SCLK_RATIO_48 : 0);
+        if (ret < 0)
+                return ret;
+
+        /*
+         * The chip has a very unituitive register mapping and muxes information
+         * about data format and sample depth into the same register, but not on
+         * a logical bit-boundary. Hence, we have to refer to the format passed
+         * in the set_dai_fmt() callback and set up everything from here.
+         *
+         * First, determine the 'base' value, using the format ...
+         */
+        switch (priv->format & SND_SOC_DAIFMT_FORMAT_MASK) {
+        case SND_SOC_DAIFMT_RIGHT_J:
+                val = 0x00;
+                break;
+        case SND_SOC_DAIFMT_I2S:
+                val = 0x03;
+                break;
+        case SND_SOC_DAIFMT_LEFT_J:
+                val = 0x06;
+                break;
+        default:
+                dev_err(codec->dev, "Invalid DAI format\n");
+                return -EINVAL;
+        }
+
+        /* ... then add the offset for the sample bit depth. */
+        switch (params_format(params)) {
+        case SNDRV_PCM_FORMAT_S16_LE:
+                val += 0;
+                break;
+        case SNDRV_PCM_FORMAT_S20_3LE:
+                val += 1;
+                break;
+        case SNDRV_PCM_FORMAT_S24_3LE:
+                val += 2;
+                break;
+        default:
+                dev_err(codec->dev, "Invalid bit width\n");
+                return -EINVAL;
+        };
+
+        ret = regmap_write(priv->regmap, TAS5086_SERIAL_DATA_IF, val);
+        if (ret < 0)
+                return ret;
+
+        /* clock is considered valid now */
+        ret = regmap_update_bits(priv->regmap, TAS5086_CLOCK_CONTROL,
+                                 TAS5086_CLOCK_VALID, TAS5086_CLOCK_VALID);
+        if (ret < 0)
+                return ret;
+
+        return tas5086_set_deemph(codec);
+}
+
+static int tas5086_mute_stream(struct snd_soc_dai *dai, int mute, int stream)
+{
+        struct snd_soc_codec *codec = dai->codec;
+        struct tas5086_private *priv = snd_soc_codec_get_drvdata(codec);
+        unsigned int val = 0;
+
+        if (mute)
+                val = TAS5086_SOFT_MUTE_ALL;
+
+        return regmap_write(priv->regmap, TAS5086_SOFT_MUTE, val);
+}
+
+/* TAS5086 controls */
+static const DECLARE_TLV_DB_SCALE(tas5086_dac_tlv, -10350, 50, 1);
+
+static const struct snd_kcontrol_new tas5086_controls[] = {
+        SOC_SINGLE_TLV("Master Playback Volume", TAS5086_MASTER_VOL,
+                       0, 0xff, 1, tas5086_dac_tlv),
+        SOC_DOUBLE_R_TLV("Channel 1/2 Playback Volume",
+                         TAS5086_CHANNEL_VOL(0), TAS5086_CHANNEL_VOL(1),
+                         0, 0xff, 1, tas5086_dac_tlv),
+        SOC_DOUBLE_R_TLV("Channel 3/4 Playback Volume",
+                         TAS5086_CHANNEL_VOL(2), TAS5086_CHANNEL_VOL(3),
+                         0, 0xff, 1, tas5086_dac_tlv),
+        SOC_DOUBLE_R_TLV("Channel 5/6 Playback Volume",
+                         TAS5086_CHANNEL_VOL(4), TAS5086_CHANNEL_VOL(5),
+                         0, 0xff, 1, tas5086_dac_tlv),
+        SOC_SINGLE_BOOL_EXT("De-emphasis Switch", 0,
+                            tas5086_get_deemph, tas5086_put_deemph),
+};
+
+static const struct snd_soc_dai_ops tas5086_dai_ops = {
+        .hw_params      = tas5086_hw_params,
+        .set_sysclk     = tas5086_set_dai_sysclk,
+        .set_fmt        = tas5086_set_dai_fmt,
+        .mute_stream    = tas5086_mute_stream,
+};
+
+static struct snd_soc_dai_driver tas5086_dai = {
+        .name = "tas5086-hifi",
+        .playback = {
+                .stream_name    = "Playback",
+                .channels_min   = 2,
+                .channels_max   = 6,
+                .rates          = TAS5086_PCM_RATES,
+                .formats        = TAS5086_PCM_FORMATS,
+        },
+        .ops = &tas5086_dai_ops,
+};
+
+#ifdef CONFIG_PM
+static int tas5086_soc_resume(struct snd_soc_codec *codec)
+{
+        struct tas5086_private *priv = snd_soc_codec_get_drvdata(codec);
+
+        /* Restore codec state */
+        return regcache_sync(priv->regmap);
+}
+#else
+#define tas5086_soc_resume      NULL
+#endif /* CONFIG_PM */
+
+#ifdef CONFIG_OF
+static const struct of_device_id tas5086_dt_ids[] = {
+        { .compatible = "ti,tas5086", },
+        { }
+};
+MODULE_DEVICE_TABLE(of, tas5086_dt_ids);
+#endif
+
+/* charge period values in microseconds */
+static const int tas5086_charge_period[] = {
+          13000,  16900,   23400,   31200,   41600,   54600,   72800,   96200,
+         130000, 156000,  234000,  312000,  416000,  546000,  728000,  962000,
+        1300000, 169000, 2340000, 3120000, 4160000, 5460000, 7280000, 9620000,
+};
+
+static int tas5086_probe(struct snd_soc_codec *codec)
+{
+        struct tas5086_private *priv = snd_soc_codec_get_drvdata(codec);
+        int charge_period = 1300000; /* hardware default is 1300 ms */
+        int i, ret;
+
+        if (of_match_device(of_match_ptr(tas5086_dt_ids), codec->dev)) {
+                struct device_node *of_node = codec->dev->of_node;
+                of_property_read_u32(of_node, "ti,charge-period", &charge_period);
+        }
+
+        /* lookup and set split-capacitor charge period */
+        if (charge_period == 0) {
+                regmap_write(priv->regmap, TAS5086_SPLIT_CAP_CHARGE, 0);
+        } else {
+                i = index_in_array(tas5086_charge_period,
+                                   ARRAY_SIZE(tas5086_charge_period),
+                                   charge_period);
+                if (i >= 0)
+                        regmap_write(priv->regmap, TAS5086_SPLIT_CAP_CHARGE,
+                                     i + 0x08);
+                else
+                        dev_warn(codec->dev,
+                                 "Invalid split-cap charge period of %d ns.\n",
+                                 charge_period);
+        }
+
+        /* enable factory trim */
+        ret = regmap_write(priv->regmap, TAS5086_OSC_TRIM, 0x00);
+        if (ret < 0)
+                return ret;
+
+        /* start all channels */
+        ret = regmap_write(priv->regmap, TAS5086_SYS_CONTROL_2, 0x20);
+        if (ret < 0)
+                return ret;
+
+        /* set master volume to 0 dB */
+        ret = regmap_write(priv->regmap, TAS5086_MASTER_VOL, 0x30);
+        if (ret < 0)
+                return ret;
+
+        /* mute all channels for now */
+        ret = regmap_write(priv->regmap, TAS5086_SOFT_MUTE,
+                           TAS5086_SOFT_MUTE_ALL);
+        if (ret < 0)
+                return ret;
+
+        return 0;
+}
+
+static int tas5086_remove(struct snd_soc_codec *codec)
+{
+        struct tas5086_private *priv = snd_soc_codec_get_drvdata(codec);
+
+        if (gpio_is_valid(priv->gpio_nreset))
+                /* Set codec to the reset state */
+                gpio_set_value(priv->gpio_nreset, 0);
+
+        return 0;
+};
+
+static struct snd_soc_codec_driver soc_codec_dev_tas5086 = {
+        .probe                  = tas5086_probe,
+        .remove                 = tas5086_remove,
+        .resume                 = tas5086_soc_resume,
+        .controls               = tas5086_controls,
+        .num_controls           = ARRAY_SIZE(tas5086_controls),
+};
+
+static const struct i2c_device_id tas5086_i2c_id[] = {
+        { "tas5086", 0 },
+        { }
+};
+MODULE_DEVICE_TABLE(i2c, tas5086_i2c_id);
+
+static const struct regmap_config tas5086_regmap = {
+        .reg_bits               = 8,
+        .val_bits               = 8,
+        .max_register           = ARRAY_SIZE(tas5086_reg_defaults),
+        .reg_defaults           = tas5086_reg_defaults,
+        .num_reg_defaults       = ARRAY_SIZE(tas5086_reg_defaults),
+        .cache_type             = REGCACHE_RBTREE,
+        .volatile_reg           = tas5086_volatile_reg,
+        .writeable_reg          = tas5086_writeable_reg,
+        .readable_reg           = tas5086_accessible_reg,
+};
+
+static int tas5086_i2c_probe(struct i2c_client *i2c,
+                             const struct i2c_device_id *id)
+{
+        struct tas5086_private *priv;
+        struct device *dev = &i2c->dev;
+        int gpio_nreset = -EINVAL;
+        int i, ret;
+
+        priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL);
+        if (!priv)
+                return -ENOMEM;
+
+        priv->regmap = devm_regmap_init_i2c(i2c, &tas5086_regmap);
+        if (IS_ERR(priv->regmap)) {
+                ret = PTR_ERR(priv->regmap);
+                dev_err(&i2c->dev, "Failed to create regmap: %d\n", ret);
+                return ret;
+        }
+
+        i2c_set_clientdata(i2c, priv);
+
+        if (of_match_device(of_match_ptr(tas5086_dt_ids), dev)) {
+                struct device_node *of_node = dev->of_node;
+                gpio_nreset = of_get_named_gpio(of_node, "reset-gpio", 0);
+        }
+
+        if (gpio_is_valid(gpio_nreset))
+                if (devm_gpio_request(dev, gpio_nreset, "TAS5086 Reset"))
+                        gpio_nreset = -EINVAL;
+
+        if (gpio_is_valid(gpio_nreset)) {
+                /* Reset codec - minimum assertion time is 400ns */
+                gpio_direction_output(gpio_nreset, 0);
+                udelay(1);
+                gpio_set_value(gpio_nreset, 1);
+
+                /* Codec needs ~15ms to wake up */
+                msleep(15);
+        }
+
+        priv->gpio_nreset = gpio_nreset;
+
+        /* The TAS5086 always returns 0x03 in its TAS5086_DEV_ID register */
+        ret = regmap_read(priv->regmap, TAS5086_DEV_ID, &i);
+        if (ret < 0)
+                return ret;
+
+        if (i != 0x3) {
+                dev_err(dev,
+                        "Failed to identify TAS5086 codec (got %02x)\n", i);
+                return -ENODEV;
+        }
+
+        return snd_soc_register_codec(&i2c->dev, &soc_codec_dev_tas5086,
+                &tas5086_dai, 1);
+}
+
+static int tas5086_i2c_remove(struct i2c_client *i2c)
+{
+        snd_soc_unregister_codec(&i2c->dev);
+        return 0;
+}
+
+static struct i2c_driver tas5086_i2c_driver = {
+        .driver = {
+                .name   = "tas5086",
+                .owner  = THIS_MODULE,
+                .of_match_table = of_match_ptr(tas5086_dt_ids),
+        },
+        .id_table       = tas5086_i2c_id,
+        .probe          = tas5086_i2c_probe,
+        .remove         = tas5086_i2c_remove,
+};
+
+static int __init tas5086_modinit(void)
+{
+        return i2c_add_driver(&tas5086_i2c_driver);
+}
+module_init(tas5086_modinit);
+
+static void __exit tas5086_modexit(void)
+{
+        i2c_del_driver(&tas5086_i2c_driver);
+}
+module_exit(tas5086_modexit);
+
+MODULE_AUTHOR("Daniel Mack <zonque@gmail.com>");
+MODULE_DESCRIPTION("Texas Instruments TAS5086 ALSA SoC Codec Driver");
+MODULE_LICENSE("GPL");