Add the rt linux 4.1.3-rt3 as base

Import the rt linux 4.1.3-rt3 as OPNFV kvm base.

It's from git://git.kernel.org/pub/scm/linux/kernel/git/rt/linux-rt-devel.git linux-4.1.y-rt and
the base is:

commit 0917f823c59692d751951bf5ea699a2d1e2f26a2
Author: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
Date:   Sat Jul 25 12:13:34 2015 +0200

    Prepare v4.1.3-rt3

    Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>

We lose all the git history this way and it's not good. We
should apply another opnfv project repo in future.

Change-Id: I87543d81c9df70d99c5001fbdf646b202c19f423
Signed-off-by: Yunhong Jiang <yunhong.jiang@intel.com>

1 files changed, 678 insertions, 0 deletions

diff --git a/kernel/sound/soc/codecs/cs4271.c b/kernel/sound/soc/codecs/cs4271.c
new file mode 100644
index 000000000..e770ee6f3
--- /dev/null
+++ b/kernel/sound/soc/codecs/cs4271.c
@@ -0,0 +1,678 @@
+/*
+ * 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 <linux/gpio.h>
+#include <linux/of.h>
+#include <linux/of_device.h>
+#include <linux/of_gpio.h>
+#include <sound/pcm.h>
+#include <sound/soc.h>
+#include <sound/tlv.h>
+#include <sound/cs4271.h>
+#include "cs4271.h"
+
+#define CS4271_PCM_FORMATS (SNDRV_PCM_FMTBIT_S16_LE | \
+			    SNDRV_PCM_FMTBIT_S24_LE | \
+			    SNDRV_PCM_FMTBIT_S32_LE)
+#define CS4271_PCM_RATES SNDRV_PCM_RATE_8000_192000
+
+/*
+ * CS4271 registers
+ */
+#define CS4271_MODE1	0x01	/* Mode Control 1 */
+#define CS4271_DACCTL	0x02	/* DAC Control */
+#define CS4271_DACVOL	0x03	/* DAC Volume & Mixing Control */
+#define CS4271_VOLA	0x04	/* DAC Channel A Volume Control */
+#define CS4271_VOLB	0x05	/* DAC Channel B Volume Control */
+#define CS4271_ADCCTL	0x06	/* ADC Control */
+#define CS4271_MODE2	0x07	/* Mode Control 2 */
+#define CS4271_CHIPID	0x08	/* 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 struct reg_default cs4271_reg_defaults[] = {
+	{ CS4271_MODE1,		0, },
+	{ CS4271_DACCTL,	CS4271_DACCTL_AMUTE, },
+	{ CS4271_DACVOL,	CS4271_DACVOL_SOFT | CS4271_DACVOL_ATAPI_AL_BR, },
+	{ CS4271_VOLA,		0, },
+	{ CS4271_VOLB,		0, },
+	{ CS4271_ADCCTL,	0, },
+	{ CS4271_MODE2,		0, },
+};
+
+static bool cs4271_volatile_reg(struct device *dev, unsigned int reg)
+{
+	return reg == CS4271_CHIPID;
+}
+
+struct cs4271_private {
+	unsigned int			mclk;
+	bool				master;
+	bool				deemph;
+	struct regmap			*regmap;
+	/* 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;
+	/* enable soft reset workaround */
+	bool				enable_soft_reset;
+};
+
+static const struct snd_soc_dapm_widget cs4271_dapm_widgets[] = {
+SND_SOC_DAPM_INPUT("AINA"),
+SND_SOC_DAPM_INPUT("AINB"),
+
+SND_SOC_DAPM_OUTPUT("AOUTA+"),
+SND_SOC_DAPM_OUTPUT("AOUTA-"),
+SND_SOC_DAPM_OUTPUT("AOUTB+"),
+SND_SOC_DAPM_OUTPUT("AOUTB-"),
+};
+
+static const struct snd_soc_dapm_route cs4271_dapm_routes[] = {
+	{ "Capture", NULL, "AINA" },
+	{ "Capture", NULL, "AINB" },
+
+	{ "AOUTA+", NULL, "Playback" },
+	{ "AOUTA-", NULL, "Playback" },
+	{ "AOUTB+", NULL, "Playback" },
+	{ "AOUTB-", NULL, "Playback" },
+};
+
+/*
+ * @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;
+	int ret;
+
+	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;
+		ret = regmap_update_bits(cs4271->regmap, CS4271_ADCCTL,
+			CS4271_ADCCTL_ADC_DIF_MASK, CS4271_ADCCTL_ADC_DIF_LJ);
+		if (ret < 0)
+			return ret;
+		break;
+	case SND_SOC_DAIFMT_I2S:
+		val |= CS4271_MODE1_DAC_DIF_I2S;
+		ret = regmap_update_bits(cs4271->regmap, CS4271_ADCCTL,
+			CS4271_ADCCTL_ADC_DIF_MASK, CS4271_ADCCTL_ADC_DIF_I2S);
+		if (ret < 0)
+			return ret;
+		break;
+	default:
+		dev_err(codec->dev, "Invalid DAI format\n");
+		return -EINVAL;
+	}
+
+	ret = regmap_update_bits(cs4271->regmap, CS4271_MODE1,
+		CS4271_MODE1_DAC_DIF_MASK | CS4271_MODE1_MASTER, val);
+	if (ret < 0)
+		return ret;
+	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, ret;
+	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;
+	}
+
+	ret = regmap_update_bits(cs4271->regmap, CS4271_DACCTL,
+		CS4271_DACCTL_DEM_MASK, val);
+	if (ret < 0)
+		return ret;
+	return 0;
+}
+
+static int cs4271_get_deemph(struct snd_kcontrol *kcontrol,
+			     struct snd_ctl_elem_value *ucontrol)
+{
+	struct snd_soc_codec *codec = snd_soc_kcontrol_codec(kcontrol);
+	struct cs4271_private *cs4271 = snd_soc_codec_get_drvdata(codec);
+
+	ucontrol->value.integer.value[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_soc_kcontrol_codec(kcontrol);
+	struct cs4271_private *cs4271 = snd_soc_codec_get_drvdata(codec);
+
+	cs4271->deemph = ucontrol->value.integer.value[0];
+	return cs4271_set_deemph(codec);
+}
+
+struct cs4271_clk_cfg {
+	bool		master;		/* codec mode */
+	u8		speed_mode;	/* codec speed mode: 1x, 2x, 4x */
+	unsigned short	ratio;		/* MCLK / sample rate */
+	u8		ratio_mask;	/* ratio bit mask for Master mode */
+};
+
+static struct cs4271_clk_cfg cs4271_clk_tab[] = {
+	{1, CS4271_MODE1_MODE_1X, 256,  CS4271_MODE1_DIV_1},
+	{1, CS4271_MODE1_MODE_1X, 384,  CS4271_MODE1_DIV_15},
+	{1, CS4271_MODE1_MODE_1X, 512,  CS4271_MODE1_DIV_2},
+	{1, CS4271_MODE1_MODE_1X, 768,  CS4271_MODE1_DIV_3},
+	{1, CS4271_MODE1_MODE_2X, 128,  CS4271_MODE1_DIV_1},
+	{1, CS4271_MODE1_MODE_2X, 192,  CS4271_MODE1_DIV_15},
+	{1, CS4271_MODE1_MODE_2X, 256,  CS4271_MODE1_DIV_2},
+	{1, CS4271_MODE1_MODE_2X, 384,  CS4271_MODE1_DIV_3},
+	{1, CS4271_MODE1_MODE_4X, 64,   CS4271_MODE1_DIV_1},
+	{1, CS4271_MODE1_MODE_4X, 96,   CS4271_MODE1_DIV_15},
+	{1, CS4271_MODE1_MODE_4X, 128,  CS4271_MODE1_DIV_2},
+	{1, CS4271_MODE1_MODE_4X, 192,  CS4271_MODE1_DIV_3},
+	{0, CS4271_MODE1_MODE_1X, 256,  CS4271_MODE1_DIV_1},
+	{0, CS4271_MODE1_MODE_1X, 384,  CS4271_MODE1_DIV_1},
+	{0, CS4271_MODE1_MODE_1X, 512,  CS4271_MODE1_DIV_1},
+	{0, CS4271_MODE1_MODE_1X, 768,  CS4271_MODE1_DIV_2},
+	{0, CS4271_MODE1_MODE_1X, 1024, CS4271_MODE1_DIV_2},
+	{0, CS4271_MODE1_MODE_2X, 128,  CS4271_MODE1_DIV_1},
+	{0, CS4271_MODE1_MODE_2X, 192,  CS4271_MODE1_DIV_1},
+	{0, CS4271_MODE1_MODE_2X, 256,  CS4271_MODE1_DIV_1},
+	{0, CS4271_MODE1_MODE_2X, 384,  CS4271_MODE1_DIV_2},
+	{0, CS4271_MODE1_MODE_2X, 512,  CS4271_MODE1_DIV_2},
+	{0, CS4271_MODE1_MODE_4X, 64,   CS4271_MODE1_DIV_1},
+	{0, CS4271_MODE1_MODE_4X, 96,   CS4271_MODE1_DIV_1},
+	{0, CS4271_MODE1_MODE_4X, 128,  CS4271_MODE1_DIV_1},
+	{0, CS4271_MODE1_MODE_4X, 192,  CS4271_MODE1_DIV_2},
+	{0, CS4271_MODE1_MODE_4X, 256,  CS4271_MODE1_DIV_2},
+};
+
+#define CS4171_NR_RATIOS ARRAY_SIZE(cs4271_clk_tab)
+
+static int cs4271_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 cs4271_private *cs4271 = snd_soc_codec_get_drvdata(codec);
+	int i, ret;
+	unsigned int ratio, val;
+
+	if (cs4271->enable_soft_reset) {
+		/*
+		 * Put the codec in soft reset and back again in case it's not
+		 * currently streaming data. This way of bringing the codec in
+		 * sync to the current clocks is not explicitly documented in
+		 * the data sheet, but it seems to work fine, and in contrast
+		 * to a read hardware reset, we don't have to sync back all
+		 * registers every time.
+		 */
+
+		if ((substream->stream == SNDRV_PCM_STREAM_PLAYBACK &&
+		     !dai->capture_active) ||
+		    (substream->stream == SNDRV_PCM_STREAM_CAPTURE &&
+		     !dai->playback_active)) {
+			ret = regmap_update_bits(cs4271->regmap, CS4271_MODE2,
+						 CS4271_MODE2_PDN,
+						 CS4271_MODE2_PDN);
+			if (ret < 0)
+				return ret;
+
+			ret = regmap_update_bits(cs4271->regmap, CS4271_MODE2,
+						 CS4271_MODE2_PDN, 0);
+			if (ret < 0)
+				return ret;
+		}
+	}
+
+	cs4271->rate = params_rate(params);
+
+	/* Configure DAC */
+	if (cs4271->rate < 50000)
+		val = CS4271_MODE1_MODE_1X;
+	else if (cs4271->rate < 100000)
+		val = CS4271_MODE1_MODE_2X;
+	else
+		val = CS4271_MODE1_MODE_4X;
+
+	ratio = cs4271->mclk / cs4271->rate;
+	for (i = 0; i < CS4171_NR_RATIOS; i++)
+		if ((cs4271_clk_tab[i].master == cs4271->master) &&
+		    (cs4271_clk_tab[i].speed_mode == val) &&
+		    (cs4271_clk_tab[i].ratio == ratio))
+			break;
+
+	if (i == CS4171_NR_RATIOS) {
+		dev_err(codec->dev, "Invalid sample rate\n");
+		return -EINVAL;
+	}
+
+	val |= cs4271_clk_tab[i].ratio_mask;
+
+	ret = regmap_update_bits(cs4271->regmap, CS4271_MODE1,
+		CS4271_MODE1_MODE_MASK | CS4271_MODE1_DIV_MASK, val);
+	if (ret < 0)
+		return ret;
+
+	return cs4271_set_deemph(codec);
+}
+
+static int cs4271_mute_stream(struct snd_soc_dai *dai, int mute, int stream)
+{
+	struct snd_soc_codec *codec = dai->codec;
+	struct cs4271_private *cs4271 = snd_soc_codec_get_drvdata(codec);
+	int ret;
+	int val_a = 0;
+	int val_b = 0;
+
+	if (stream != SNDRV_PCM_STREAM_PLAYBACK)
+		return 0;
+
+	if (mute) {
+		val_a = CS4271_VOLA_MUTE;
+		val_b = CS4271_VOLB_MUTE;
+	}
+
+	ret = regmap_update_bits(cs4271->regmap, CS4271_VOLA,
+				 CS4271_VOLA_MUTE, val_a);
+	if (ret < 0)
+		return ret;
+
+	ret = regmap_update_bits(cs4271->regmap, CS4271_VOLB,
+				 CS4271_VOLB_MUTE, val_b);
+	if (ret < 0)
+		return ret;
+
+	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 const 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,
+	.mute_stream	= cs4271_mute_stream,
+};
+
+static struct snd_soc_dai_driver cs4271_dai = {
+	.name = "cs4271-hifi",
+	.playback = {
+		.stream_name	= "Playback",
+		.channels_min	= 2,
+		.channels_max	= 2,
+		.rates		= CS4271_PCM_RATES,
+		.formats	= CS4271_PCM_FORMATS,
+	},
+	.capture = {
+		.stream_name	= "Capture",
+		.channels_min	= 2,
+		.channels_max	= 2,
+		.rates		= CS4271_PCM_RATES,
+		.formats	= CS4271_PCM_FORMATS,
+	},
+	.ops = &cs4271_dai_ops,
+	.symmetric_rates = 1,
+};
+
+#ifdef CONFIG_PM
+static int cs4271_soc_suspend(struct snd_soc_codec *codec)
+{
+	int ret;
+	struct cs4271_private *cs4271 = snd_soc_codec_get_drvdata(codec);
+
+	/* Set power-down bit */
+	ret = regmap_update_bits(cs4271->regmap, CS4271_MODE2,
+				 CS4271_MODE2_PDN, CS4271_MODE2_PDN);
+	if (ret < 0)
+		return ret;
+
+	return 0;
+}
+
+static int cs4271_soc_resume(struct snd_soc_codec *codec)
+{
+	int ret;
+	struct cs4271_private *cs4271 = snd_soc_codec_get_drvdata(codec);
+
+	/* Restore codec state */
+	ret = regcache_sync(cs4271->regmap);
+	if (ret < 0)
+		return ret;
+
+	/* then disable the power-down bit */
+	ret = regmap_update_bits(cs4271->regmap, CS4271_MODE2,
+				 CS4271_MODE2_PDN, 0);
+	if (ret < 0)
+		return ret;
+
+	return 0;
+}
+#else
+#define cs4271_soc_suspend	NULL
+#define cs4271_soc_resume	NULL
+#endif /* CONFIG_PM */
+
+#ifdef CONFIG_OF
+const struct of_device_id cs4271_dt_ids[] = {
+	{ .compatible = "cirrus,cs4271", },
+	{ }
+};
+MODULE_DEVICE_TABLE(of, cs4271_dt_ids);
+EXPORT_SYMBOL_GPL(cs4271_dt_ids);
+#endif
+
+static int cs4271_codec_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;
+	bool amutec_eq_bmutec = false;
+
+#ifdef CONFIG_OF
+	if (of_match_device(cs4271_dt_ids, codec->dev)) {
+		if (of_get_property(codec->dev->of_node,
+				     "cirrus,amutec-eq-bmutec", NULL))
+			amutec_eq_bmutec = true;
+
+		if (of_get_property(codec->dev->of_node,
+				     "cirrus,enable-soft-reset", NULL))
+			cs4271->enable_soft_reset = true;
+	}
+#endif
+
+	if (cs4271plat) {
+		amutec_eq_bmutec = cs4271plat->amutec_eq_bmutec;
+		cs4271->enable_soft_reset = cs4271plat->enable_soft_reset;
+	}
+
+	if (gpio_is_valid(cs4271->gpio_nreset)) {
+		/* Reset codec */
+		gpio_direction_output(cs4271->gpio_nreset, 0);
+		mdelay(1);
+		gpio_set_value(cs4271->gpio_nreset, 1);
+		/* Give the codec time to wake up */
+		mdelay(1);
+	}
+
+	ret = regmap_update_bits(cs4271->regmap, CS4271_MODE2,
+				 CS4271_MODE2_PDN | CS4271_MODE2_CPEN,
+				 CS4271_MODE2_PDN | CS4271_MODE2_CPEN);
+	if (ret < 0)
+		return ret;
+	ret = regmap_update_bits(cs4271->regmap, CS4271_MODE2,
+				 CS4271_MODE2_PDN, 0);
+	if (ret < 0)
+		return ret;
+	/* Power-up sequence requires 85 uS */
+	udelay(85);
+
+	if (amutec_eq_bmutec)
+		regmap_update_bits(cs4271->regmap, CS4271_MODE2,
+				   CS4271_MODE2_MUTECAEQUB,
+				   CS4271_MODE2_MUTECAEQUB);
+
+	return 0;
+}
+
+static int cs4271_codec_remove(struct snd_soc_codec *codec)
+{
+	struct cs4271_private *cs4271 = snd_soc_codec_get_drvdata(codec);
+
+	if (gpio_is_valid(cs4271->gpio_nreset))
+		/* Set codec to the reset state */
+		gpio_set_value(cs4271->gpio_nreset, 0);
+
+	return 0;
+};
+
+static struct snd_soc_codec_driver soc_codec_dev_cs4271 = {
+	.probe			= cs4271_codec_probe,
+	.remove			= cs4271_codec_remove,
+	.suspend		= cs4271_soc_suspend,
+	.resume			= cs4271_soc_resume,
+
+	.controls		= cs4271_snd_controls,
+	.num_controls		= ARRAY_SIZE(cs4271_snd_controls),
+	.dapm_widgets		= cs4271_dapm_widgets,
+	.num_dapm_widgets	= ARRAY_SIZE(cs4271_dapm_widgets),
+	.dapm_routes		= cs4271_dapm_routes,
+	.num_dapm_routes	= ARRAY_SIZE(cs4271_dapm_routes),
+};
+
+static int cs4271_common_probe(struct device *dev,
+			       struct cs4271_private **c)
+{
+	struct cs4271_platform_data *cs4271plat = dev->platform_data;
+	struct cs4271_private *cs4271;
+
+	cs4271 = devm_kzalloc(dev, sizeof(*cs4271), GFP_KERNEL);
+	if (!cs4271)
+		return -ENOMEM;
+
+	if (of_match_device(cs4271_dt_ids, dev))
+		cs4271->gpio_nreset =
+			of_get_named_gpio(dev->of_node, "reset-gpio", 0);
+
+	if (cs4271plat)
+		cs4271->gpio_nreset = cs4271plat->gpio_nreset;
+
+	if (gpio_is_valid(cs4271->gpio_nreset)) {
+		int ret;
+
+		ret = devm_gpio_request(dev, cs4271->gpio_nreset,
+					"CS4271 Reset");
+		if (ret < 0)
+			return ret;
+	}
+
+	*c = cs4271;
+	return 0;
+}
+
+const struct regmap_config cs4271_regmap_config = {
+	.max_register = CS4271_LASTREG,
+
+	.reg_defaults = cs4271_reg_defaults,
+	.num_reg_defaults = ARRAY_SIZE(cs4271_reg_defaults),
+	.cache_type = REGCACHE_RBTREE,
+
+	.volatile_reg = cs4271_volatile_reg,
+};
+EXPORT_SYMBOL_GPL(cs4271_regmap_config);
+
+int cs4271_probe(struct device *dev, struct regmap *regmap)
+{
+	struct cs4271_private *cs4271;
+	int ret;
+
+	if (IS_ERR(regmap))
+		return PTR_ERR(regmap);
+
+	ret = cs4271_common_probe(dev, &cs4271);
+	if (ret < 0)
+		return ret;
+
+	dev_set_drvdata(dev, cs4271);
+	cs4271->regmap = regmap;
+
+	return snd_soc_register_codec(dev, &soc_codec_dev_cs4271, &cs4271_dai,
+				      1);
+}
+EXPORT_SYMBOL_GPL(cs4271_probe);
+
+MODULE_AUTHOR("Alexander Sverdlin <subaparts@yandex.ru>");
+MODULE_DESCRIPTION("Cirrus Logic CS4271 ALSA SoC Codec Driver");
+MODULE_LICENSE("GPL");