ASoC: CS4271 codec support

Added support for CS4271 codec to ASoC.

Signed-off-by: Alexander Sverdlin <subaparts@yandex.ru>
Acked-by: Liam Girdwood <lrg@slimlogic.co.uk>
Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>

4 files changed, 661 insertions, 0 deletions

diff --git a/include/sound/cs4271.h b/include/sound/cs4271.h
new file mode 100644
index 000000000000..16f8d325d3dc
--- /dev/null
+++ b/include/sound/cs4271.h
@@ -0,0 +1,25 @@
+/*
+ * Definitions for CS4271 ASoC codec driver
+ *
+ * Copyright (c) 2010 Alexander Sverdlin <subaparts@yandex.ru>
+ *
+ * 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.
+ */
+
+#ifndef __CS4271_H
+#define __CS4271_H
+
+struct cs4271_platform_data {
+        int gpio_nreset;        /* GPIO driving Reset pin, if any */
+        int gpio_disable;       /* GPIO that disable serial bus, if any */
+};
+
+#endif /* __CS4271_H */
diff --git a/sound/soc/codecs/Kconfig b/sound/soc/codecs/Kconfig
index a9cb2a04ad56..e239345a4d5d 100644
--- a/sound/soc/codecs/Kconfig
+++ b/sound/soc/codecs/Kconfig
@@ -26,6 +26,7 @@ config SND_SOC_ALL_CODECS
         select SND_SOC_CQ0093VC if MFD_DAVINCI_VOICECODEC
         select SND_SOC_CS42L51 if I2C
         select SND_SOC_CS4270 if I2C
+        select SND_SOC_CS4271 if SND_SOC_I2C_AND_SPI
         select SND_SOC_CX20442
         select SND_SOC_DA7210 if I2C
         select SND_SOC_JZ4740_CODEC if SOC_JZ4740
@@ -157,6 +158,9 @@ config SND_SOC_CS4270_VD33_ERRATA
         bool
         depends on SND_SOC_CS4270
 
+config SND_SOC_CS4271
+        tristate
+
 config SND_SOC_CX20442
         tristate
 
diff --git a/sound/soc/codecs/Makefile b/sound/soc/codecs/Makefile
index 68e76af894b9..83b7accd7037 100644
--- a/sound/soc/codecs/Makefile
+++ b/sound/soc/codecs/Makefile
@@ -12,6 +12,7 @@ snd-soc-ak4671-objs := ak4671.o
 snd-soc-cq93vc-objs := cq93vc.o
 snd-soc-cs42l51-objs := cs42l51.o
 snd-soc-cs4270-objs := cs4270.o
+snd-soc-cs4271-objs := cs4271.o
 snd-soc-cx20442-objs := cx20442.o
 snd-soc-da7210-objs := da7210.o
 snd-soc-dmic-objs := dmic.o
@@ -93,6 +94,7 @@ obj-$(CONFIG_SND_SOC_AK4671)	+= snd-soc-ak4671.o
 obj-$(CONFIG_SND_SOC_CQ0093VC) += snd-soc-cq93vc.o
 obj-$(CONFIG_SND_SOC_CS42L51)   += snd-soc-cs42l51.o
 obj-$(CONFIG_SND_SOC_CS4270)    += snd-soc-cs4270.o
+obj-$(CONFIG_SND_SOC_CS4271)    += snd-soc-cs4271.o
 obj-$(CONFIG_SND_SOC_CX20442)   += snd-soc-cx20442.o
 obj-$(CONFIG_SND_SOC_DA7210)    += snd-soc-da7210.o
 obj-$(CONFIG_SND_SOC_DMIC)      += snd-soc-dmic.o
diff --git a/sound/soc/codecs/cs4271.c b/sound/soc/codecs/cs4271.c
new file mode 100644
index 000000000000..237ece3f1046
--- /dev/null
+++ b/sound/soc/codecs/cs4271.c
@@ -0,0 +1,630 @@
+/*
+ * CS4271 ASoC codec driver
+ *
+ * Copyright (c) 2010 Alexander Sverdlin <subaparts@yandex.ru>
+ *
+ * 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.
+ *
+ * This driver support CS4271 codec being master or slave, working
+ * in control port mode, connected either via SPI or I2C.
+ * The data format accepted is I2S or left-justified.
+ * DAPM support not implemented.
+ */
+
+#include <linux/module.h>
+#include <linux/slab.h>
+#include <linux/delay.h>
+#include <sound/pcm.h>
+#include <sound/soc.h>
+#include <sound/tlv.h>
+#include <linux/gpio.h>
+#include <linux/i2c.h>
+#include <linux/spi/spi.h>
+#include <sound/cs4271.h>
+
+#define CS4271_PCM_FORMATS (SNDRV_PCM_FMTBIT_S16_LE | \
+                            SNDRV_PCM_FMTBIT_S24_LE | \
+                            SNDRV_PCM_FMTBIT_S32_LE)
+
+/*
+ * CS4271 registers
+ * High byte represents SPI chip address (0x10) + write command (0)
+ * Low byte - codec register address
+ */
+#define CS4271_MODE1    0x2001  /* Mode Control 1 */
+#define CS4271_DACCTL   0x2002  /* DAC Control */
+#define CS4271_DACVOL   0x2003  /* DAC Volume & Mixing Control */
+#define CS4271_VOLA     0x2004  /* DAC Channel A Volume Control */
+#define CS4271_VOLB     0x2005  /* DAC Channel B Volume Control */
+#define CS4271_ADCCTL   0x2006  /* ADC Control */
+#define CS4271_MODE2    0x2007  /* Mode Control 2 */
+#define CS4271_CHIPID   0x2008  /* Chip ID */
+
+#define CS4271_FIRSTREG CS4271_MODE1
+#define CS4271_LASTREG  CS4271_MODE2
+#define CS4271_NR_REGS  ((CS4271_LASTREG & 0xFF) + 1)
+
+/* Bit masks for the CS4271 registers */
+#define CS4271_MODE1_MODE_MASK  0xC0
+#define CS4271_MODE1_MODE_1X    0x00
+#define CS4271_MODE1_MODE_2X    0x80
+#define CS4271_MODE1_MODE_4X    0xC0
+
+#define CS4271_MODE1_DIV_MASK   0x30
+#define CS4271_MODE1_DIV_1      0x00
+#define CS4271_MODE1_DIV_15     0x10
+#define CS4271_MODE1_DIV_2      0x20
+#define CS4271_MODE1_DIV_3      0x30
+
+#define CS4271_MODE1_MASTER     0x08
+
+#define CS4271_MODE1_DAC_DIF_MASK       0x07
+#define CS4271_MODE1_DAC_DIF_LJ         0x00
+#define CS4271_MODE1_DAC_DIF_I2S        0x01
+#define CS4271_MODE1_DAC_DIF_RJ16       0x02
+#define CS4271_MODE1_DAC_DIF_RJ24       0x03
+#define CS4271_MODE1_DAC_DIF_RJ20       0x04
+#define CS4271_MODE1_DAC_DIF_RJ18       0x05
+
+#define CS4271_DACCTL_AMUTE     0x80
+#define CS4271_DACCTL_IF_SLOW   0x40
+
+#define CS4271_DACCTL_DEM_MASK  0x30
+#define CS4271_DACCTL_DEM_DIS   0x00
+#define CS4271_DACCTL_DEM_441   0x10
+#define CS4271_DACCTL_DEM_48    0x20
+#define CS4271_DACCTL_DEM_32    0x30
+
+#define CS4271_DACCTL_SVRU      0x08
+#define CS4271_DACCTL_SRD       0x04
+#define CS4271_DACCTL_INVA      0x02
+#define CS4271_DACCTL_INVB      0x01
+
+#define CS4271_DACVOL_BEQUA     0x40
+#define CS4271_DACVOL_SOFT      0x20
+#define CS4271_DACVOL_ZEROC     0x10
+
+#define CS4271_DACVOL_ATAPI_MASK        0x0F
+#define CS4271_DACVOL_ATAPI_M_M         0x00
+#define CS4271_DACVOL_ATAPI_M_BR        0x01
+#define CS4271_DACVOL_ATAPI_M_BL        0x02
+#define CS4271_DACVOL_ATAPI_M_BLR2      0x03
+#define CS4271_DACVOL_ATAPI_AR_M        0x04
+#define CS4271_DACVOL_ATAPI_AR_BR       0x05
+#define CS4271_DACVOL_ATAPI_AR_BL       0x06
+#define CS4271_DACVOL_ATAPI_AR_BLR2     0x07
+#define CS4271_DACVOL_ATAPI_AL_M        0x08
+#define CS4271_DACVOL_ATAPI_AL_BR       0x09
+#define CS4271_DACVOL_ATAPI_AL_BL       0x0A
+#define CS4271_DACVOL_ATAPI_AL_BLR2     0x0B
+#define CS4271_DACVOL_ATAPI_ALR2_M      0x0C
+#define CS4271_DACVOL_ATAPI_ALR2_BR     0x0D
+#define CS4271_DACVOL_ATAPI_ALR2_BL     0x0E
+#define CS4271_DACVOL_ATAPI_ALR2_BLR2   0x0F
+
+#define CS4271_VOLA_MUTE        0x80
+#define CS4271_VOLA_VOL_MASK    0x7F
+#define CS4271_VOLB_MUTE        0x80
+#define CS4271_VOLB_VOL_MASK    0x7F
+
+#define CS4271_ADCCTL_DITHER16  0x20
+
+#define CS4271_ADCCTL_ADC_DIF_MASK      0x10
+#define CS4271_ADCCTL_ADC_DIF_LJ        0x00
+#define CS4271_ADCCTL_ADC_DIF_I2S       0x10
+
+#define CS4271_ADCCTL_MUTEA     0x08
+#define CS4271_ADCCTL_MUTEB     0x04
+#define CS4271_ADCCTL_HPFDA     0x02
+#define CS4271_ADCCTL_HPFDB     0x01
+
+#define CS4271_MODE2_LOOP       0x10
+#define CS4271_MODE2_MUTECAEQUB 0x08
+#define CS4271_MODE2_FREEZE     0x04
+#define CS4271_MODE2_CPEN       0x02
+#define CS4271_MODE2_PDN        0x01
+
+#define CS4271_CHIPID_PART_MASK 0xF0
+#define CS4271_CHIPID_REV_MASK  0x0F
+
+/*
+ * Default CS4271 power-up configuration
+ * Array contains non-existing in hw register at address 0
+ * Array do not include Chip ID, as codec driver does not use
+ * registers read operations at all
+ */
+static const u8 cs4271_dflt_reg[CS4271_NR_REGS] = {
+        0,
+        0,
+        CS4271_DACCTL_AMUTE,
+        CS4271_DACVOL_SOFT | CS4271_DACVOL_ATAPI_AL_BR,
+        0,
+        0,
+        0,
+        0,
+};
+
+struct cs4271_private {
+        /* SND_SOC_I2C or SND_SOC_SPI */
+        enum snd_soc_control_type       bus_type;
+        void                            *control_data;
+        unsigned int                    mclk;
+        bool                            master;
+        bool                            deemph;
+        /* Current sample rate for de-emphasis control */
+        int                             rate;
+        /* GPIO driving Reset pin, if any */
+        int                             gpio_nreset;
+        /* GPIO that disable serial bus, if any */
+        int                             gpio_disable;
+};
+
+struct cs4271_clk_cfg {
+        unsigned int    ratio;          /* MCLK / sample rate */
+        u8              speed_mode;     /* codec speed mode: 1x, 2x, 4x */
+        u8              mclk_master;    /* ratio bit mask for Master mode */
+        u8              mclk_slave;     /* ratio bit mask for Slave mode */
+};
+
+static struct cs4271_clk_cfg cs4271_clk_tab[] = {
+        {64,   CS4271_MODE1_MODE_4X, CS4271_MODE1_DIV_1,  CS4271_MODE1_DIV_1},
+        {96,   CS4271_MODE1_MODE_4X, CS4271_MODE1_DIV_15, CS4271_MODE1_DIV_1},
+        {128,  CS4271_MODE1_MODE_2X, CS4271_MODE1_DIV_1,  CS4271_MODE1_DIV_1},
+        {192,  CS4271_MODE1_MODE_2X, CS4271_MODE1_DIV_15, CS4271_MODE1_DIV_1},
+        {256,  CS4271_MODE1_MODE_1X, CS4271_MODE1_DIV_1,  CS4271_MODE1_DIV_1},
+        {384,  CS4271_MODE1_MODE_1X, CS4271_MODE1_DIV_15, CS4271_MODE1_DIV_1},
+        {512,  CS4271_MODE1_MODE_1X, CS4271_MODE1_DIV_2,  CS4271_MODE1_DIV_1},
+        {768,  CS4271_MODE1_MODE_1X, CS4271_MODE1_DIV_3,  CS4271_MODE1_DIV_3},
+        {1024, CS4271_MODE1_MODE_1X, CS4271_MODE1_DIV_3,  CS4271_MODE1_DIV_3}
+};
+
+#define CS4171_NR_RATIOS ARRAY_SIZE(cs4271_clk_tab)
+
+/*
+ * @freq is the desired MCLK rate
+ * MCLK rate should (c) be the sample rate, multiplied by one of the
+ * ratios listed in cs4271_mclk_fs_ratios table
+ */
+static int cs4271_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 cs4271_private *cs4271 = snd_soc_codec_get_drvdata(codec);
+
+        cs4271->mclk = freq;
+        return 0;
+}
+
+static int cs4271_set_dai_fmt(struct snd_soc_dai *codec_dai,
+                              unsigned int format)
+{
+        struct snd_soc_codec *codec = codec_dai->codec;
+        struct cs4271_private *cs4271 = snd_soc_codec_get_drvdata(codec);
+        unsigned int val = 0;
+
+        switch (format & SND_SOC_DAIFMT_MASTER_MASK) {
+        case SND_SOC_DAIFMT_CBS_CFS:
+                cs4271->master = 0;
+                break;
+        case SND_SOC_DAIFMT_CBM_CFM:
+                cs4271->master = 1;
+                val |= CS4271_MODE1_MASTER;
+                break;
+        default:
+                dev_err(codec->dev, "Invalid DAI format\n");
+                return -EINVAL;
+        }
+
+        switch (format & SND_SOC_DAIFMT_FORMAT_MASK) {
+        case SND_SOC_DAIFMT_LEFT_J:
+                val |= CS4271_MODE1_DAC_DIF_LJ;
+                snd_soc_update_bits(codec, CS4271_ADCCTL,
+                        CS4271_ADCCTL_ADC_DIF_MASK, CS4271_ADCCTL_ADC_DIF_LJ);
+                break;
+        case SND_SOC_DAIFMT_I2S:
+                val |= CS4271_MODE1_DAC_DIF_I2S;
+                snd_soc_update_bits(codec, CS4271_ADCCTL,
+                        CS4271_ADCCTL_ADC_DIF_MASK, CS4271_ADCCTL_ADC_DIF_I2S);
+                break;
+        default:
+                dev_err(codec->dev, "Invalid DAI format\n");
+                return -EINVAL;
+        }
+
+        snd_soc_update_bits(codec, CS4271_MODE1,
+                CS4271_MODE1_DAC_DIF_MASK | CS4271_MODE1_MASTER, val);
+
+        return 0;
+}
+
+static int cs4271_deemph[] = {0, 44100, 48000, 32000};
+
+static int cs4271_set_deemph(struct snd_soc_codec *codec)
+{
+        struct cs4271_private *cs4271 = snd_soc_codec_get_drvdata(codec);
+        int i;
+        int val = CS4271_DACCTL_DEM_DIS;
+
+        if (cs4271->deemph) {
+                /* Find closest de-emphasis freq */
+                val = 1;
+                for (i = 2; i < ARRAY_SIZE(cs4271_deemph); i++)
+                        if (abs(cs4271_deemph[i] - cs4271->rate) <
+                            abs(cs4271_deemph[val] - cs4271->rate))
+                                val = i;
+                val <<= 4;
+        }
+
+        return snd_soc_update_bits(codec, CS4271_DACCTL,
+                CS4271_DACCTL_DEM_MASK, val);
+}
+
+static int cs4271_get_deemph(struct snd_kcontrol *kcontrol,
+                             struct snd_ctl_elem_value *ucontrol)
+{
+        struct snd_soc_codec *codec = snd_kcontrol_chip(kcontrol);
+        struct cs4271_private *cs4271 = snd_soc_codec_get_drvdata(codec);
+
+        ucontrol->value.enumerated.item[0] = cs4271->deemph;
+        return 0;
+}
+
+static int cs4271_put_deemph(struct snd_kcontrol *kcontrol,
+                             struct snd_ctl_elem_value *ucontrol)
+{
+        struct snd_soc_codec *codec = snd_kcontrol_chip(kcontrol);
+        struct cs4271_private *cs4271 = snd_soc_codec_get_drvdata(codec);
+
+        cs4271->deemph = ucontrol->value.enumerated.item[0];
+        return cs4271_set_deemph(codec);
+}
+
+static int cs4271_hw_params(struct snd_pcm_substream *substream,
+                            struct snd_pcm_hw_params *params,
+                            struct snd_soc_dai *dai)
+{
+        struct snd_soc_pcm_runtime *rtd = substream->private_data;
+        struct snd_soc_codec *codec = rtd->codec;
+        struct cs4271_private *cs4271 = snd_soc_codec_get_drvdata(codec);
+        unsigned int i, ratio, val;
+
+        cs4271->rate = params_rate(params);
+        ratio = cs4271->mclk / cs4271->rate;
+        for (i = 0; i < CS4171_NR_RATIOS; i++)
+                if (cs4271_clk_tab[i].ratio == ratio)
+                        break;
+
+        if ((i == CS4171_NR_RATIOS) || ((ratio == 1024) && cs4271->master)) {
+                dev_err(codec->dev, "Invalid sample rate\n");
+                return -EINVAL;
+        }
+
+        /* Configure DAC */
+        val = cs4271_clk_tab[i].speed_mode;
+
+        if (cs4271->master)
+                val |= cs4271_clk_tab[i].mclk_master;
+        else
+                val |= cs4271_clk_tab[i].mclk_slave;
+
+        snd_soc_update_bits(codec, CS4271_MODE1,
+                CS4271_MODE1_MODE_MASK | CS4271_MODE1_DIV_MASK, val);
+
+        return cs4271_set_deemph(codec);
+}
+
+static int cs4271_digital_mute(struct snd_soc_dai *dai, int mute)
+{
+        struct snd_soc_codec *codec = dai->codec;
+        int val_a = 0;
+        int val_b = 0;
+
+        if (mute) {
+                val_a = CS4271_VOLA_MUTE;
+                val_b = CS4271_VOLB_MUTE;
+        }
+
+        snd_soc_update_bits(codec, CS4271_VOLA, CS4271_VOLA_MUTE, val_a);
+        snd_soc_update_bits(codec, CS4271_VOLB, CS4271_VOLB_MUTE, val_b);
+
+        return 0;
+}
+
+/* CS4271 controls */
+static DECLARE_TLV_DB_SCALE(cs4271_dac_tlv, -12700, 100, 0);
+
+static const struct snd_kcontrol_new cs4271_snd_controls[] = {
+        SOC_DOUBLE_R_TLV("Master Playback Volume", CS4271_VOLA, CS4271_VOLB,
+                0, 0x7F, 1, cs4271_dac_tlv),
+        SOC_SINGLE("Digital Loopback Switch", CS4271_MODE2, 4, 1, 0),
+        SOC_SINGLE("Soft Ramp Switch", CS4271_DACVOL, 5, 1, 0),
+        SOC_SINGLE("Zero Cross Switch", CS4271_DACVOL, 4, 1, 0),
+        SOC_SINGLE_BOOL_EXT("De-emphasis Switch", 0,
+                cs4271_get_deemph, cs4271_put_deemph),
+        SOC_SINGLE("Auto-Mute Switch", CS4271_DACCTL, 7, 1, 0),
+        SOC_SINGLE("Slow Roll Off Filter Switch", CS4271_DACCTL, 6, 1, 0),
+        SOC_SINGLE("Soft Volume Ramp-Up Switch", CS4271_DACCTL, 3, 1, 0),
+        SOC_SINGLE("Soft Ramp-Down Switch", CS4271_DACCTL, 2, 1, 0),
+        SOC_SINGLE("Left Channel Inversion Switch", CS4271_DACCTL, 1, 1, 0),
+        SOC_SINGLE("Right Channel Inversion Switch", CS4271_DACCTL, 0, 1, 0),
+        SOC_DOUBLE("Master Capture Switch", CS4271_ADCCTL, 3, 2, 1, 1),
+        SOC_SINGLE("Dither 16-Bit Data Switch", CS4271_ADCCTL, 5, 1, 0),
+        SOC_DOUBLE("High Pass Filter Switch", CS4271_ADCCTL, 1, 0, 1, 1),
+        SOC_DOUBLE_R("Master Playback Switch", CS4271_VOLA, CS4271_VOLB,
+                7, 1, 1),
+};
+
+static struct snd_soc_dai_ops cs4271_dai_ops = {
+        .hw_params      = cs4271_hw_params,
+        .set_sysclk     = cs4271_set_dai_sysclk,
+        .set_fmt        = cs4271_set_dai_fmt,
+        .digital_mute   = cs4271_digital_mute,
+};
+
+struct snd_soc_dai_driver cs4271_dai = {
+        .name = "cs4271-hifi",
+        .playback = {
+                .stream_name    = "Playback",
+                .channels_min   = 2,
+                .channels_max   = 2,
+                .rates          = SNDRV_PCM_RATE_8000_96000,
+                .formats        = CS4271_PCM_FORMATS,
+        },
+        .capture = {
+                .stream_name    = "Capture",
+                .channels_min   = 2,
+                .channels_max   = 2,
+                .rates          = SNDRV_PCM_RATE_8000_96000,
+                .formats        = CS4271_PCM_FORMATS,
+        },
+        .ops = &cs4271_dai_ops,
+        .symmetric_rates = 1,
+};
+
+#ifdef CONFIG_PM
+static int cs4271_soc_suspend(struct snd_soc_codec *codec, pm_message_t mesg)
+{
+        /* Set power-down bit */
+        snd_soc_update_bits(codec, CS4271_MODE2, 0, CS4271_MODE2_PDN);
+        return 0;
+}
+
+static int cs4271_soc_resume(struct snd_soc_codec *codec)
+{
+        /* Restore codec state */
+        snd_soc_cache_sync(codec);
+        /* then disable the power-down bit */
+        snd_soc_update_bits(codec, CS4271_MODE2, CS4271_MODE2_PDN, 0);
+        return 0;
+}
+#else
+#define cs4271_soc_suspend      NULL
+#define cs4271_soc_resume       NULL
+#endif /* CONFIG_PM */
+
+static int cs4271_probe(struct snd_soc_codec *codec)
+{
+        struct cs4271_private *cs4271 = snd_soc_codec_get_drvdata(codec);
+        struct cs4271_platform_data *cs4271plat = codec->dev->platform_data;
+        int ret;
+        int gpio_nreset = -EINVAL;
+        int gpio_disable = -EINVAL;
+
+        codec->control_data = cs4271->control_data;
+
+        if (cs4271plat) {
+                if (gpio_is_valid(cs4271plat->gpio_nreset))
+                        gpio_nreset = cs4271plat->gpio_nreset;
+                if (gpio_is_valid(cs4271plat->gpio_disable))
+                        gpio_disable = cs4271plat->gpio_disable;
+        }
+
+        if (gpio_disable >= 0)
+                if (gpio_request(gpio_disable, "CS4271 Disable"))
+                        gpio_disable = -EINVAL;
+        if (gpio_disable >= 0)
+                gpio_direction_output(gpio_disable, 0);
+
+        if (gpio_nreset >= 0)
+                if (gpio_request(gpio_nreset, "CS4271 Reset"))
+                        gpio_nreset = -EINVAL;
+        if (gpio_nreset >= 0) {
+                /* Reset codec */
+                gpio_direction_output(gpio_nreset, 0);
+                udelay(1);
+                gpio_set_value(gpio_nreset, 1);
+                /* Give the codec time to wake up */
+                udelay(1);
+        }
+
+        cs4271->gpio_nreset = gpio_nreset;
+        cs4271->gpio_disable = gpio_disable;
+
+        /*
+         * In case of I2C, chip address specified in board data.
+         * So cache IO operations use 8 bit codec register address.
+         * In case of SPI, chip address and register address
+         * passed together as 16 bit value.
+         * Anyway, register address is masked with 0xFF inside
+         * soc-cache code.
+         */
+        if (cs4271->bus_type == SND_SOC_SPI)
+                ret = snd_soc_codec_set_cache_io(codec, 16, 8,
+                        cs4271->bus_type);
+        else
+                ret = snd_soc_codec_set_cache_io(codec, 8, 8,
+                        cs4271->bus_type);
+        if (ret) {
+                dev_err(codec->dev, "Failed to set cache I/O: %d\n", ret);
+                return ret;
+        }
+
+        snd_soc_update_bits(codec, CS4271_MODE2, 0,
+                CS4271_MODE2_PDN | CS4271_MODE2_CPEN);
+        snd_soc_update_bits(codec, CS4271_MODE2, CS4271_MODE2_PDN, 0);
+        /* Power-up sequence requires 85 uS */
+        udelay(85);
+
+        return snd_soc_add_controls(codec, cs4271_snd_controls,
+                ARRAY_SIZE(cs4271_snd_controls));
+}
+
+static int cs4271_remove(struct snd_soc_codec *codec)
+{
+        struct cs4271_private *cs4271 = snd_soc_codec_get_drvdata(codec);
+        int gpio_nreset, gpio_disable;
+
+        gpio_nreset = cs4271->gpio_nreset;
+        gpio_disable = cs4271->gpio_disable;
+
+        if (gpio_is_valid(gpio_nreset)) {
+                /* Set codec to the reset state */
+                gpio_set_value(gpio_nreset, 0);
+                gpio_free(gpio_nreset);
+        }
+
+        if (gpio_is_valid(gpio_disable))
+                gpio_free(gpio_disable);
+
+        return 0;
+};
+
+struct snd_soc_codec_driver soc_codec_dev_cs4271 = {
+        .probe                  = cs4271_probe,
+        .remove                 = cs4271_remove,
+        .suspend                = cs4271_soc_suspend,
+        .resume                 = cs4271_soc_resume,
+        .reg_cache_default      = cs4271_dflt_reg,
+        .reg_cache_size         = ARRAY_SIZE(cs4271_dflt_reg),
+        .reg_word_size          = sizeof(cs4271_dflt_reg[0]),
+        .compress_type          = SND_SOC_FLAT_COMPRESSION,
+};
+
+#if defined(CONFIG_SPI_MASTER)
+static int __devinit cs4271_spi_probe(struct spi_device *spi)
+{
+        struct cs4271_private *cs4271;
+
+        cs4271 = devm_kzalloc(&spi->dev, sizeof(*cs4271), GFP_KERNEL);
+        if (!cs4271)
+                return -ENOMEM;
+
+        spi_set_drvdata(spi, cs4271);
+        cs4271->control_data = spi;
+        cs4271->bus_type = SND_SOC_SPI;
+
+        return snd_soc_register_codec(&spi->dev, &soc_codec_dev_cs4271,
+                &cs4271_dai, 1);
+}
+
+static int __devexit cs4271_spi_remove(struct spi_device *spi)
+{
+        snd_soc_unregister_codec(&spi->dev);
+        return 0;
+}
+
+static struct spi_driver cs4271_spi_driver = {
+        .driver = {
+                .name   = "cs4271",
+                .owner  = THIS_MODULE,
+        },
+        .probe          = cs4271_spi_probe,
+        .remove         = __devexit_p(cs4271_spi_remove),
+};
+#endif /* defined(CONFIG_SPI_MASTER) */
+
+#if defined(CONFIG_I2C) || defined(CONFIG_I2C_MODULE)
+static struct i2c_device_id cs4271_i2c_id[] = {
+        {"cs4271", 0},
+        {}
+};
+MODULE_DEVICE_TABLE(i2c, cs4271_i2c_id);
+
+static int __devinit cs4271_i2c_probe(struct i2c_client *client,
+                                      const struct i2c_device_id *id)
+{
+        struct cs4271_private *cs4271;
+
+        cs4271 = devm_kzalloc(&client->dev, sizeof(*cs4271), GFP_KERNEL);
+        if (!cs4271)
+                return -ENOMEM;
+
+        i2c_set_clientdata(client, cs4271);
+        cs4271->control_data = client;
+        cs4271->bus_type = SND_SOC_I2C;
+
+        return snd_soc_register_codec(&client->dev, &soc_codec_dev_cs4271,
+                &cs4271_dai, 1);
+}
+
+static int __devexit cs4271_i2c_remove(struct i2c_client *client)
+{
+        snd_soc_unregister_codec(&client->dev);
+        return 0;
+}
+
+static struct i2c_driver cs4271_i2c_driver = {
+        .driver = {
+                .name   = "cs4271",
+                .owner  = THIS_MODULE,
+        },
+        .id_table       = cs4271_i2c_id,
+        .probe          = cs4271_i2c_probe,
+        .remove         = __devexit_p(cs4271_i2c_remove),
+};
+#endif /* defined(CONFIG_I2C) || defined(CONFIG_I2C_MODULE) */
+
+/*
+ * We only register our serial bus driver here without
+ * assignment to particular chip. So if any of the below
+ * fails, there is some problem with I2C or SPI subsystem.
+ * In most cases this module will be compiled with support
+ * of only one serial bus.
+ */
+static int __init cs4271_modinit(void)
+{
+        int ret;
+
+#if defined(CONFIG_I2C) || defined(CONFIG_I2C_MODULE)
+        ret = i2c_add_driver(&cs4271_i2c_driver);
+        if (ret) {
+                pr_err("Failed to register CS4271 I2C driver: %d\n", ret);
+                return ret;
+        }
+#endif
+
+#if defined(CONFIG_SPI_MASTER)
+        ret = spi_register_driver(&cs4271_spi_driver);
+        if (ret) {
+                pr_err("Failed to register CS4271 SPI driver: %d\n", ret);
+                return ret;
+        }
+#endif
+
+        return 0;
+}
+module_init(cs4271_modinit);
+
+static void __exit cs4271_modexit(void)
+{
+#if defined(CONFIG_SPI_MASTER)
+        spi_unregister_driver(&cs4271_spi_driver);
+#endif
+
+#if defined(CONFIG_I2C) || defined(CONFIG_I2C_MODULE)
+        i2c_del_driver(&cs4271_i2c_driver);
+#endif
+}
+module_exit(cs4271_modexit);
+
+MODULE_AUTHOR("Alexander Sverdlin <subaparts@yandex.ru>");
+MODULE_DESCRIPTION("Cirrus Logic CS4271 ALSA SoC Codec Driver");
+MODULE_LICENSE("GPL");