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Commit 3b2af7f7 authored by Peter Rosin's avatar Peter Rosin Committed by Mark Brown
Browse files

ASoC: max9860: new driver 

This is a driver for the MAX9860 Mono Audio Voice Codec.

https://datasheets.maximintegrated.com/en/ds/MAX9860.pdf



This driver does not support sidetone since the DVST register field is
backwards with the mute near the maximum level instead of the minimum.

Signed-off-by: default avatarPeter Rosin <peda@axentia.se>
Signed-off-by: default avatarMark Brown <broonie@kernel.org>
parent e1f90fc2

MAINTAINERS

+7 −0
Original line number Diff line number Diff line
@@ -7253,6 +7253,13 @@ F: Documentation/devicetree/bindings/i2c/max6697.txt 
F:	drivers/hwmon/max6697.c

F:	include/linux/platform_data/max6697.h



MAX9860 MONO AUDIO VOICE CODEC DRIVER

M:	Peter Rosin <peda@axentia.se>

L:	alsa-devel@alsa-project.org (moderated for non-subscribers)

S:	Maintained

F:	Documentation/devicetree/bindings/sound/max9860.txt

F:	sound/soc/codecs/max9860.*



MAXIM MUIC CHARGER DRIVERS FOR EXYNOS BASED BOARDS

M:	Krzysztof Kozlowski <k.kozlowski@samsung.com>

L:	linux-pm@vger.kernel.org

sound/soc/codecs/Kconfig

+6 −0
Original line number Diff line number Diff line
@@ -84,6 +84,7 @@ config SND_SOC_ALL_CODECS 
	select SND_SOC_MAX98925 if I2C

	select SND_SOC_MAX98926 if I2C

	select SND_SOC_MAX9850 if I2C

	select SND_SOC_MAX9860 if I2C

	select SND_SOC_MAX9768 if I2C

	select SND_SOC_MAX9877 if I2C

	select SND_SOC_MC13783 if MFD_MC13XXX
@@ -547,6 +548,11 @@ config SND_SOC_MAX98926 
config SND_SOC_MAX9850

	tristate



config SND_SOC_MAX9860

	tristate "Maxim MAX9860 Mono Audio Voice Codec"

	depends on I2C

	select REGMAP_I2C



config SND_SOC_PCM1681

	tristate "Texas Instruments PCM1681 CODEC"

	depends on I2C

sound/soc/codecs/Makefile

+2 −0
Original line number Diff line number Diff line
@@ -79,6 +79,7 @@ snd-soc-max9867-objs := max9867.o 
snd-soc-max98925-objs := max98925.o

snd-soc-max98926-objs := max98926.o

snd-soc-max9850-objs := max9850.o

snd-soc-max9860-objs := max9860.o

snd-soc-mc13783-objs := mc13783.o

snd-soc-ml26124-objs := ml26124.o

snd-soc-nau8825-objs := nau8825.o
@@ -293,6 +294,7 @@ obj-$(CONFIG_SND_SOC_MAX9867) += snd-soc-max9867.o 
obj-$(CONFIG_SND_SOC_MAX98925)	+= snd-soc-max98925.o

obj-$(CONFIG_SND_SOC_MAX98926)	+= snd-soc-max98926.o

obj-$(CONFIG_SND_SOC_MAX9850)	+= snd-soc-max9850.o

obj-$(CONFIG_SND_SOC_MAX9860)	+= snd-soc-max9860.o

obj-$(CONFIG_SND_SOC_MC13783)	+= snd-soc-mc13783.o

obj-$(CONFIG_SND_SOC_ML26124)	+= snd-soc-ml26124.o

obj-$(CONFIG_SND_SOC_NAU8825)   += snd-soc-nau8825.o

sound/soc/codecs/max9860.c

0 → 100644
+753 −0
Original line number Diff line number Diff line 
/*

 * Driver for the MAX9860 Mono Audio Voice Codec

 *

 * https://datasheets.maximintegrated.com/en/ds/MAX9860.pdf

 *

 * The driver does not support sidetone since the DVST register field is

 * backwards with the mute near the maximum level instead of the minimum.

 *

 * Author: Peter Rosin <peda@axentia.s>

 *         Copyright 2016 Axentia Technologies

 *

 * 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/init.h>

#include <linux/module.h>

#include <linux/clk.h>

#include <linux/kernel.h>

#include <linux/pm_runtime.h>

#include <linux/regmap.h>

#include <linux/i2c.h>

#include <linux/regulator/consumer.h>

#include <sound/soc.h>

#include <sound/soc-dapm.h>

#include <sound/pcm_params.h>

#include <sound/tlv.h>



#include "max9860.h"



struct max9860_priv {

	struct regmap *regmap;

	struct regulator *dvddio;

	struct notifier_block dvddio_nb;

	u8 psclk;

	unsigned long pclk_rate;

	int fmt;

};



static int max9860_dvddio_event(struct notifier_block *nb,

				unsigned long event, void *data)

{

	struct max9860_priv *max9860 = container_of(nb, struct max9860_priv,

						    dvddio_nb);

	if (event & REGULATOR_EVENT_DISABLE) {

		regcache_mark_dirty(max9860->regmap);

		regcache_cache_only(max9860->regmap, true);

	}



	return 0;

}



static const struct reg_default max9860_reg_defaults[] = {

	{ MAX9860_PWRMAN,       0x00 },

	{ MAX9860_INTEN,        0x00 },

	{ MAX9860_SYSCLK,       0x00 },

	{ MAX9860_AUDIOCLKHIGH, 0x00 },

	{ MAX9860_AUDIOCLKLOW,  0x00 },

	{ MAX9860_IFC1A,        0x00 },

	{ MAX9860_IFC1B,        0x00 },

	{ MAX9860_VOICEFLTR,    0x00 },

	{ MAX9860_DACATTN,      0x00 },

	{ MAX9860_ADCLEVEL,     0x00 },

	{ MAX9860_DACGAIN,      0x00 },

	{ MAX9860_MICGAIN,      0x00 },

	{ MAX9860_MICADC,       0x00 },

	{ MAX9860_NOISEGATE,    0x00 },

};



static bool max9860_readable(struct device *dev, unsigned int reg)

{

	switch (reg) {

	case MAX9860_INTRSTATUS ... MAX9860_MICGAIN:

	case MAX9860_MICADC ... MAX9860_PWRMAN:

	case MAX9860_REVISION:

		return true;

	}



	return false;

}



static bool max9860_writeable(struct device *dev, unsigned int reg)

{

	switch (reg) {

	case MAX9860_INTEN ... MAX9860_MICGAIN:

	case MAX9860_MICADC ... MAX9860_PWRMAN:

		return true;

	}



	return false;

}



static bool max9860_volatile(struct device *dev, unsigned int reg)

{

	switch (reg) {

	case MAX9860_INTRSTATUS:

	case MAX9860_MICREADBACK:

		return true;

	}



	return false;

}



static bool max9860_precious(struct device *dev, unsigned int reg)

{

	switch (reg) {

	case MAX9860_INTRSTATUS:

		return true;

	}



	return false;

}



const struct regmap_config max9860_regmap = {

	.reg_bits = 8,

	.val_bits = 8,



	.readable_reg = max9860_readable,

	.writeable_reg = max9860_writeable,

	.volatile_reg = max9860_volatile,

	.precious_reg = max9860_precious,



	.max_register = MAX9860_MAX_REGISTER,

	.reg_defaults = max9860_reg_defaults,

	.num_reg_defaults = ARRAY_SIZE(max9860_reg_defaults),

	.cache_type = REGCACHE_RBTREE,

};



static const DECLARE_TLV_DB_SCALE(dva_tlv, -9100, 100, 1);

static const DECLARE_TLV_DB_SCALE(dvg_tlv, 0, 600, 0);

static const DECLARE_TLV_DB_SCALE(adc_tlv, -1200, 100, 0);

static const DECLARE_TLV_DB_RANGE(pam_tlv,

	0, MAX9860_PAM_MAX - 1,             TLV_DB_SCALE_ITEM(-2000, 2000, 1),

	MAX9860_PAM_MAX, MAX9860_PAM_MAX,   TLV_DB_SCALE_ITEM(3000, 0, 0));

static const DECLARE_TLV_DB_SCALE(pgam_tlv, 0, 100, 0);

static const DECLARE_TLV_DB_SCALE(anth_tlv, -7600, 400, 1);

static const DECLARE_TLV_DB_SCALE(agcth_tlv, -1800, 100, 0);



static const char * const agchld_text[] = {

	"AGC Disabled", "50ms", "100ms", "400ms"

};



static SOC_ENUM_SINGLE_DECL(agchld_enum, MAX9860_MICADC,

			    MAX9860_AGCHLD_SHIFT, agchld_text);



static const char * const agcsrc_text[] = {

	"Left ADC", "Left/Right ADC"

};



static SOC_ENUM_SINGLE_DECL(agcsrc_enum, MAX9860_MICADC,

			    MAX9860_AGCSRC_SHIFT, agcsrc_text);



static const char * const agcatk_text[] = {

	"3ms", "12ms", "50ms", "200ms"

};



static SOC_ENUM_SINGLE_DECL(agcatk_enum, MAX9860_MICADC,

			    MAX9860_AGCATK_SHIFT, agcatk_text);



static const char * const agcrls_text[] = {

	"78ms", "156ms", "312ms", "625ms",

	"1.25s", "2.5s", "5s", "10s"

};



static SOC_ENUM_SINGLE_DECL(agcrls_enum, MAX9860_MICADC,

			    MAX9860_AGCRLS_SHIFT, agcrls_text);



static const char * const filter_text[] = {

	"Disabled",

	"Elliptical HP 217Hz notch (16kHz)",

	"Butterworth HP 500Hz (16kHz)",

	"Elliptical HP 217Hz notch (8kHz)",

	"Butterworth HP 500Hz (8kHz)",

	"Butterworth HP 200Hz (48kHz)"

};



static SOC_ENUM_SINGLE_DECL(avflt_enum, MAX9860_VOICEFLTR,

			    MAX9860_AVFLT_SHIFT, filter_text);



static SOC_ENUM_SINGLE_DECL(dvflt_enum, MAX9860_VOICEFLTR,

			    MAX9860_DVFLT_SHIFT, filter_text);



static const struct snd_kcontrol_new max9860_controls[] = {

SOC_SINGLE_TLV("Master Playback Volume", MAX9860_DACATTN,

	       MAX9860_DVA_SHIFT, MAX9860_DVA_MUTE, 1, dva_tlv),

SOC_SINGLE_TLV("DAC Gain Volume", MAX9860_DACGAIN,

	       MAX9860_DVG_SHIFT, MAX9860_DVG_MAX, 0, dvg_tlv),

SOC_DOUBLE_TLV("Line Capture Volume", MAX9860_ADCLEVEL,

	       MAX9860_ADCLL_SHIFT, MAX9860_ADCRL_SHIFT, MAX9860_ADCxL_MIN, 1,

	       adc_tlv),



SOC_ENUM("AGC Hold Time", agchld_enum),

SOC_ENUM("AGC/Noise Gate Source", agcsrc_enum),

SOC_ENUM("AGC Attack Time", agcatk_enum),

SOC_ENUM("AGC Release Time", agcrls_enum),



SOC_SINGLE_TLV("Noise Gate Threshold Volume", MAX9860_NOISEGATE,

	       MAX9860_ANTH_SHIFT, MAX9860_ANTH_MAX, 0, anth_tlv),

SOC_SINGLE_TLV("AGC Signal Threshold Volume", MAX9860_NOISEGATE,

	       MAX9860_AGCTH_SHIFT, MAX9860_AGCTH_MIN, 1, agcth_tlv),



SOC_SINGLE_TLV("Mic PGA Volume", MAX9860_MICGAIN,

	       MAX9860_PGAM_SHIFT, MAX9860_PGAM_MIN, 1, pgam_tlv),

SOC_SINGLE_TLV("Mic Preamp Volume", MAX9860_MICGAIN,

	       MAX9860_PAM_SHIFT, MAX9860_PAM_MAX, 0, pam_tlv),



SOC_ENUM("ADC Filter", avflt_enum),

SOC_ENUM("DAC Filter", dvflt_enum),

};



static const struct snd_soc_dapm_widget max9860_dapm_widgets[] = {

SND_SOC_DAPM_INPUT("MICL"),

SND_SOC_DAPM_INPUT("MICR"),



SND_SOC_DAPM_ADC("ADCL", NULL, MAX9860_PWRMAN, MAX9860_ADCLEN_SHIFT, 0),

SND_SOC_DAPM_ADC("ADCR", NULL, MAX9860_PWRMAN, MAX9860_ADCREN_SHIFT, 0),



SND_SOC_DAPM_AIF_OUT("AIFOUTL", "Capture", 0, SND_SOC_NOPM, 0, 0),

SND_SOC_DAPM_AIF_OUT("AIFOUTR", "Capture", 1, SND_SOC_NOPM, 0, 0),



SND_SOC_DAPM_AIF_IN("AIFINL", "Playback", 0, SND_SOC_NOPM, 0, 0),

SND_SOC_DAPM_AIF_IN("AIFINR", "Playback", 1, SND_SOC_NOPM, 0, 0),



SND_SOC_DAPM_DAC("DAC", NULL, MAX9860_PWRMAN, MAX9860_DACEN_SHIFT, 0),



SND_SOC_DAPM_OUTPUT("OUT"),



SND_SOC_DAPM_SUPPLY("Supply", SND_SOC_NOPM, 0, 0,

		    NULL, SND_SOC_DAPM_PRE_PMU | SND_SOC_DAPM_POST_PMD),

SND_SOC_DAPM_REGULATOR_SUPPLY("AVDD", 0, 0),

SND_SOC_DAPM_REGULATOR_SUPPLY("DVDD", 0, 0),

SND_SOC_DAPM_CLOCK_SUPPLY("mclk"),

};



static const struct snd_soc_dapm_route max9860_dapm_routes[] = {

	{ "ADCL", NULL, "MICL" },

	{ "ADCR", NULL, "MICR" },

	{ "AIFOUTL", NULL, "ADCL" },

	{ "AIFOUTR", NULL, "ADCR" },



	{ "DAC", NULL, "AIFINL" },

	{ "DAC", NULL, "AIFINR" },

	{ "OUT", NULL, "DAC" },



	{ "Supply", NULL, "AVDD" },

	{ "Supply", NULL, "DVDD" },

	{ "Supply", NULL, "mclk" },



	{ "DAC", NULL, "Supply" },

	{ "ADCL", NULL, "Supply" },

	{ "ADCR", NULL, "Supply" },

};



static int max9860_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 max9860_priv *max9860 = snd_soc_codec_get_drvdata(codec);

	u8 master;

	u8 ifc1a = 0;

	u8 ifc1b = 0;

	u8 sysclk = 0;

	unsigned long n;

	int ret;



	dev_dbg(codec->dev, "hw_params %u Hz, %u channels\n",

		params_rate(params),

		params_channels(params));



	if (params_channels(params) == 2)

		ifc1b |= MAX9860_ST;



	switch (max9860->fmt & SND_SOC_DAIFMT_MASTER_MASK) {

	case SND_SOC_DAIFMT_CBS_CFS:

		master = 0;

		break;

	case SND_SOC_DAIFMT_CBM_CFM:

		master = MAX9860_MASTER;

		break;

	default:

		return -EINVAL;

	}

	ifc1a |= master;



	if (master) {

		if (params_width(params) * params_channels(params) > 48)

			ifc1b |= MAX9860_BSEL_64X;

		else

			ifc1b |= MAX9860_BSEL_48X;

	}



	switch (max9860->fmt & SND_SOC_DAIFMT_FORMAT_MASK) {

	case SND_SOC_DAIFMT_I2S:

		ifc1a |= MAX9860_DDLY;

		ifc1b |= MAX9860_ADLY;

		break;

	case SND_SOC_DAIFMT_LEFT_J:

		ifc1a |= MAX9860_WCI;

		break;

	case SND_SOC_DAIFMT_DSP_A:

		if (params_width(params) != 16) {

			dev_err(codec->dev,

				"DSP_A works for 16 bits per sample only.\n");

			return -EINVAL;

		}

		ifc1a |= MAX9860_DDLY | MAX9860_WCI | MAX9860_HIZ | MAX9860_TDM;

		ifc1b |= MAX9860_ADLY;

		break;

	case SND_SOC_DAIFMT_DSP_B:

		if (params_width(params) != 16) {

			dev_err(codec->dev,

				"DSP_B works for 16 bits per sample only.\n");

			return -EINVAL;

		}

		ifc1a |= MAX9860_WCI | MAX9860_HIZ | MAX9860_TDM;

		break;

	default:

		return -EINVAL;

	}



	switch (max9860->fmt & SND_SOC_DAIFMT_INV_MASK) {

	case SND_SOC_DAIFMT_NB_NF:

		break;

	case SND_SOC_DAIFMT_NB_IF:

		switch (max9860->fmt & SND_SOC_DAIFMT_FORMAT_MASK) {

		case SND_SOC_DAIFMT_DSP_A:

		case SND_SOC_DAIFMT_DSP_B:

			return -EINVAL;

		}

		ifc1a ^= MAX9860_WCI;

		break;

	case SND_SOC_DAIFMT_IB_IF:

		switch (max9860->fmt & SND_SOC_DAIFMT_FORMAT_MASK) {

		case SND_SOC_DAIFMT_DSP_A:

		case SND_SOC_DAIFMT_DSP_B:

			return -EINVAL;

		}

		ifc1a ^= MAX9860_WCI;

		/* fall through */

	case SND_SOC_DAIFMT_IB_NF:

		ifc1a ^= MAX9860_DBCI;

		ifc1b ^= MAX9860_ABCI;

		break;

	default:

		return -EINVAL;

	}



	dev_dbg(codec->dev, "IFC1A  %02x\n", ifc1a);

	ret = regmap_write(max9860->regmap, MAX9860_IFC1A, ifc1a);

	if (ret) {

		dev_err(codec->dev, "Failed to set IFC1A: %d\n", ret);

		return ret;

	}

	dev_dbg(codec->dev, "IFC1B  %02x\n", ifc1b);

	ret = regmap_write(max9860->regmap, MAX9860_IFC1B, ifc1b);

	if (ret) {

		dev_err(codec->dev, "Failed to set IFC1B: %d\n", ret);

		return ret;

	}



	/*

	 * Check if Integer Clock Mode is possible, but avoid it in slave mode

	 * since we then do not know if lrclk is derived from pclk and the

	 * datasheet mentions that the frequencies have to match exactly in

	 * order for this to work.

	 */

	if (params_rate(params) == 8000 || params_rate(params) == 16000) {

		if (master) {

			switch (max9860->pclk_rate) {

			case 12000000:

				sysclk = MAX9860_FREQ_12MHZ;

				break;

			case 13000000:

				sysclk = MAX9860_FREQ_13MHZ;

				break;

			case 19200000:

				sysclk = MAX9860_FREQ_19_2MHZ;

				break;

			default:

				/*

				 * Integer Clock Mode not possible. Leave

				 * sysclk at zero and fall through to the

				 * code below for PLL mode.

				 */

				break;

			}



			if (sysclk && params_rate(params) == 16000)

				sysclk |= MAX9860_16KHZ;

		}

	}



	/*

	 * Largest possible n:

	 *    65536 * 96 * 48kHz / 10MHz -> 30199

	 * Smallest possible n:

	 *    65536 * 96 *  8kHz / 20MHz -> 2517

	 * Both fit nicely in the available 15 bits, no need to apply any mask.

	 */

	n = DIV_ROUND_CLOSEST_ULL(65536ULL * 96 * params_rate(params),

				  max9860->pclk_rate);



	if (!sysclk) {

		/* PLL mode */

		if (params_rate(params) > 24000)

			sysclk |= MAX9860_16KHZ;



		if (!master)

			n |= 1; /* trigger rapid pll lock mode */

	}



	sysclk |= max9860->psclk;

	dev_dbg(codec->dev, "SYSCLK %02x\n", sysclk);

	ret = regmap_write(max9860->regmap,

			   MAX9860_SYSCLK, sysclk);

	if (ret) {

		dev_err(codec->dev, "Failed to set SYSCLK: %d\n", ret);

		return ret;

	}

	dev_dbg(codec->dev, "N %lu\n", n);

	ret = regmap_write(max9860->regmap,

			   MAX9860_AUDIOCLKHIGH, n >> 8);

	if (ret) {

		dev_err(codec->dev, "Failed to set NHI: %d\n", ret);

		return ret;

	}

	ret = regmap_write(max9860->regmap,

			   MAX9860_AUDIOCLKLOW, n & 0xff);

	if (ret) {

		dev_err(codec->dev, "Failed to set NLO: %d\n", ret);

		return ret;

	}



	if (!master) {

		dev_dbg(codec->dev, "Enable PLL\n");

		ret = regmap_update_bits(max9860->regmap, MAX9860_AUDIOCLKHIGH,

					 MAX9860_PLL, MAX9860_PLL);

		if (ret) {

			dev_err(codec->dev, "Failed to enable PLL: %d\n", ret);

			return ret;

		}

	}



	return 0;

}



static int max9860_set_fmt(struct snd_soc_dai *dai, unsigned int fmt)

{

	struct snd_soc_codec *codec = dai->codec;

	struct max9860_priv *max9860 = snd_soc_codec_get_drvdata(codec);



	switch (fmt & SND_SOC_DAIFMT_MASTER_MASK) {

	case SND_SOC_DAIFMT_CBM_CFM:

	case SND_SOC_DAIFMT_CBS_CFS:

		max9860->fmt = fmt;

		return 0;



	default:

		return -EINVAL;

	}

}



static const struct snd_soc_dai_ops max9860_dai_ops = {

	.hw_params = max9860_hw_params,

	.set_fmt = max9860_set_fmt,

};



static struct snd_soc_dai_driver max9860_dai = {

	.name = "max9860-hifi",

	.playback = {

		.stream_name = "Playback",

		.channels_min = 1,

		.channels_max = 2,

		.rates = SNDRV_PCM_RATE_CONTINUOUS,

		.rate_min = 8000,

		.rate_max = 48000,

		.formats = SNDRV_PCM_FMTBIT_S16_LE |

			   SNDRV_PCM_FMTBIT_S24_LE |

			   SNDRV_PCM_FMTBIT_S32_LE,

	},

	.capture = {

		.stream_name = "Capture",

		.channels_min = 1,

		.channels_max = 2,

		.rates = SNDRV_PCM_RATE_CONTINUOUS,

		.rate_min = 8000,

		.rate_max = 48000,

		.formats = SNDRV_PCM_FMTBIT_S16_LE |

			   SNDRV_PCM_FMTBIT_S24_LE |

			   SNDRV_PCM_FMTBIT_S32_LE,

	},

	.ops = &max9860_dai_ops,

	.symmetric_rates = 1,

};



static int max9860_set_bias_level(struct snd_soc_codec *codec,

				  enum snd_soc_bias_level level)

{

	struct max9860_priv *max9860 = dev_get_drvdata(codec->dev);

	int ret;



	switch (level) {

	case SND_SOC_BIAS_ON:

	case SND_SOC_BIAS_PREPARE:

		break;



	case SND_SOC_BIAS_STANDBY:

		ret = regmap_update_bits(max9860->regmap, MAX9860_PWRMAN,

					 MAX9860_SHDN, MAX9860_SHDN);

		if (ret) {

			dev_err(codec->dev, "Failed to remove SHDN: %d\n", ret);

			return ret;

		}

		break;



	case SND_SOC_BIAS_OFF:

		ret = regmap_update_bits(max9860->regmap, MAX9860_PWRMAN,

					 MAX9860_SHDN, 0);

		if (ret) {

			dev_err(codec->dev, "Failed to request SHDN: %d\n",

				ret);

			return ret;

		}

		break;

	}



	return 0;

}



static struct snd_soc_codec_driver max9860_codec_driver = {

	.set_bias_level = max9860_set_bias_level,

	.idle_bias_off = true,



	.controls = max9860_controls,

	.num_controls = ARRAY_SIZE(max9860_controls),

	.dapm_widgets = max9860_dapm_widgets,

	.num_dapm_widgets = ARRAY_SIZE(max9860_dapm_widgets),

	.dapm_routes = max9860_dapm_routes,

	.num_dapm_routes = ARRAY_SIZE(max9860_dapm_routes),

};



#ifdef CONFIG_PM

static int max9860_suspend(struct device *dev)

{

	struct max9860_priv *max9860 = dev_get_drvdata(dev);

	int ret;



	ret = regmap_update_bits(max9860->regmap, MAX9860_SYSCLK,

				 MAX9860_PSCLK, MAX9860_PSCLK_OFF);

	if (ret) {

		dev_err(dev, "Failed to disable clock: %d\n", ret);

		return ret;

	}



	regulator_disable(max9860->dvddio);



	return 0;

}



static int max9860_resume(struct device *dev)

{

	struct max9860_priv *max9860 = dev_get_drvdata(dev);

	int ret;



	ret = regulator_enable(max9860->dvddio);

	if (ret) {

		dev_err(dev, "Failed to enable DVDDIO: %d\n", ret);

		return ret;

	}



	regcache_cache_only(max9860->regmap, false);

	ret = regcache_sync(max9860->regmap);

	if (ret) {

		dev_err(dev, "Failed to sync cache: %d\n", ret);

		return ret;

	}



	ret = regmap_update_bits(max9860->regmap, MAX9860_SYSCLK,

				 MAX9860_PSCLK, max9860->psclk);

	if (ret) {

		dev_err(dev, "Failed to enable clock: %d\n", ret);

		return ret;

	}



	return 0;

}

#endif



const struct dev_pm_ops max9860_pm_ops = {

	SET_RUNTIME_PM_OPS(max9860_suspend, max9860_resume, NULL)

};



static int max9860_probe(struct i2c_client *i2c,

			 const struct i2c_device_id *id)

{

	struct device *dev = &i2c->dev;

	struct max9860_priv *max9860;

	int ret;

	struct clk *mclk;

	unsigned long mclk_rate;

	int i;

	int intr;



	max9860 = devm_kzalloc(dev, sizeof(struct max9860_priv), GFP_KERNEL);

	if (!max9860)

		return -ENOMEM;



	max9860->dvddio = devm_regulator_get(dev, "DVDDIO");

	if (IS_ERR(max9860->dvddio)) {

		ret = PTR_ERR(max9860->dvddio);

		if (ret != -EPROBE_DEFER)

			dev_err(dev, "Failed to get DVDDIO supply: %d\n", ret);

		return ret;

	}



	max9860->dvddio_nb.notifier_call = max9860_dvddio_event;



	ret = regulator_register_notifier(max9860->dvddio, &max9860->dvddio_nb);

	if (ret)

		dev_err(dev, "Failed to register DVDDIO notifier: %d\n", ret);



	ret = regulator_enable(max9860->dvddio);

	if (ret != 0) {

		dev_err(dev, "Failed to enable DVDDIO: %d\n", ret);

		return ret;

	}



	max9860->regmap = devm_regmap_init_i2c(i2c, &max9860_regmap);

	if (IS_ERR(max9860->regmap)) {

		ret = PTR_ERR(max9860->regmap);

		goto err_regulator;

	}



	dev_set_drvdata(dev, max9860);



	/*

	 * mclk has to be in the 10MHz to 60MHz range.

	 * psclk is used to scale mclk into pclk so that

	 * pclk is in the 10MHz to 20MHz range.

	 */

	mclk = clk_get(dev, "mclk");



	if (IS_ERR(mclk)) {

		ret = PTR_ERR(mclk);

		if (ret != -EPROBE_DEFER)

			dev_err(dev, "Failed to get MCLK: %d\n", ret);

		goto err_regulator;

	}



	mclk_rate = clk_get_rate(mclk);

	clk_put(mclk);



	if (mclk_rate > 60000000 || mclk_rate < 10000000) {

		dev_err(dev, "Bad mclk %luHz (needs 10MHz - 60MHz)\n",

			mclk_rate);

		ret = -EINVAL;

		goto err_regulator;

	}

	if (mclk_rate >= 40000000)

		max9860->psclk = 3;

	else if (mclk_rate >= 20000000)

		max9860->psclk = 2;

	else

		max9860->psclk = 1;

	max9860->pclk_rate = mclk_rate >> (max9860->psclk - 1);

	max9860->psclk <<= MAX9860_PSCLK_SHIFT;

	dev_dbg(dev, "mclk %lu pclk %lu\n", mclk_rate, max9860->pclk_rate);



	regcache_cache_bypass(max9860->regmap, true);

	for (i = 0; i < max9860_regmap.num_reg_defaults; ++i) {

		ret = regmap_write(max9860->regmap,

				   max9860_regmap.reg_defaults[i].reg,

				   max9860_regmap.reg_defaults[i].def);

		if (ret) {

			dev_err(dev, "Failed to initialize register %u: %d\n",

				max9860_regmap.reg_defaults[i].reg, ret);

			goto err_regulator;

		}

	}

	regcache_cache_bypass(max9860->regmap, false);



	ret = regmap_read(max9860->regmap, MAX9860_INTRSTATUS, &intr);

	if (ret) {

		dev_err(dev, "Failed to clear INTRSTATUS: %d\n", ret);

		goto err_regulator;

	}



	pm_runtime_set_active(dev);

	pm_runtime_enable(dev);

	pm_runtime_idle(dev);



	ret = snd_soc_register_codec(dev, &max9860_codec_driver,

				     &max9860_dai, 1);

	if (ret) {

		dev_err(dev, "Failed to register CODEC: %d\n", ret);

		goto err_pm;

	}



	return 0;



err_pm:

	pm_runtime_disable(dev);

err_regulator:

	regulator_disable(max9860->dvddio);

	return ret;

}



static int max9860_remove(struct i2c_client *i2c)

{

	struct device *dev = &i2c->dev;

	struct max9860_priv *max9860 = dev_get_drvdata(dev);



	snd_soc_unregister_codec(dev);

	pm_runtime_disable(dev);

	regulator_disable(max9860->dvddio);

	return 0;

}



static const struct i2c_device_id max9860_i2c_id[] = {

	{ "max9860", },

	{ }

};

MODULE_DEVICE_TABLE(i2c, max9860_i2c_id);



static const struct of_device_id max9860_of_match[] = {

	{ .compatible = "maxim,max9860", },

	{ }

};

MODULE_DEVICE_TABLE(of, max9860_of_match);



static struct i2c_driver max9860_i2c_driver = {

	.probe	        = max9860_probe,

	.remove         = max9860_remove,

	.id_table       = max9860_i2c_id,

	.driver         = {

		.name           = "max9860",

		.of_match_table = max9860_of_match,

		.pm             = &max9860_pm_ops,

	},

};



module_i2c_driver(max9860_i2c_driver);



MODULE_DESCRIPTION("ASoC MAX9860 Mono Audio Voice Codec driver");

MODULE_AUTHOR("Peter Rosin <peda@axentia.se>");

MODULE_LICENSE("GPL v2");

sound/soc/codecs/max9860.h

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