Commit 992bee40 authored by Ian Lartey's avatar Ian Lartey Committed by Mark Brown
Browse files

ASoC: Initial WM8741 CODEC driver 



The WM8741 is a very high performance stereo DAC designed for audio
applications such as professional recording systems, A/V receivers and
high specification CD, DVD and home theatre systems. The device supports
PCM data input word lengths from 16 to 32-bits and sampling rates up to
192kHz.  The WM8741 also supports DSD bit-stream data format, in both
direct DSD and PCM-converted DSD modes.

TODO: Expand wm8741_set_dai_sysclk and rate_constraint members to
allow for all supported sample rate / Master Clock frequency combinations.
Fully enable control of supplies.

Signed-off-by: default avatarIan Lartey <ian@opensource.wolfsonmicro.com>
Acked-by: default avatarLiam Girdwood <lrg@slimlogic.co.uk>
Signed-off-by: default avatarMark Brown <broonie@opensource.wolfsonmicro.com>
parent 988b0dc1

sound/soc/codecs/Kconfig

+4 −0
Original line number Diff line number Diff line
@@ -50,6 +50,7 @@ config SND_SOC_ALL_CODECS 
	select SND_SOC_WM8727

	select SND_SOC_WM8728 if SND_SOC_I2C_AND_SPI

	select SND_SOC_WM8731 if SND_SOC_I2C_AND_SPI

	select SND_SOC_WM8741 if SND_SOC_I2C_AND_SPI

	select SND_SOC_WM8750 if SND_SOC_I2C_AND_SPI

	select SND_SOC_WM8753 if SND_SOC_I2C_AND_SPI

	select SND_SOC_WM8776 if SND_SOC_I2C_AND_SPI
@@ -214,6 +215,9 @@ config SND_SOC_WM8728 
config SND_SOC_WM8731

	tristate



config SND_SOC_WM8741

	tristate



config SND_SOC_WM8750

	tristate

sound/soc/codecs/Makefile

+2 −0
Original line number Diff line number Diff line
@@ -35,6 +35,7 @@ snd-soc-wm8711-objs := wm8711.o 
snd-soc-wm8727-objs := wm8727.o

snd-soc-wm8728-objs := wm8728.o

snd-soc-wm8731-objs := wm8731.o

snd-soc-wm8741-objs := wm8741.o

snd-soc-wm8750-objs := wm8750.o

snd-soc-wm8753-objs := wm8753.o

snd-soc-wm8776-objs := wm8776.o
@@ -103,6 +104,7 @@ obj-$(CONFIG_SND_SOC_WM8711) += snd-soc-wm8711.o 
obj-$(CONFIG_SND_SOC_WM8727)	+= snd-soc-wm8727.o

obj-$(CONFIG_SND_SOC_WM8728)	+= snd-soc-wm8728.o

obj-$(CONFIG_SND_SOC_WM8731)	+= snd-soc-wm8731.o

obj-$(CONFIG_SND_SOC_WM8741)	+= snd-soc-wm8741.o

obj-$(CONFIG_SND_SOC_WM8750)	+= snd-soc-wm8750.o

obj-$(CONFIG_SND_SOC_WM8753)	+= snd-soc-wm8753.o

obj-$(CONFIG_SND_SOC_WM8776)	+= snd-soc-wm8776.o

sound/soc/codecs/wm8741.c

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+579 −0
Original line number Diff line number Diff line 
/*

 * wm8741.c  --  WM8741 ALSA SoC Audio driver

 *

 * Copyright 2010 Wolfson Microelectronics plc

 *

 * Author: Ian Lartey <ian@opensource.wolfsonmicro.com>

 *

 *

 * 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.

 */



#include <linux/module.h>

#include <linux/moduleparam.h>

#include <linux/init.h>

#include <linux/delay.h>

#include <linux/pm.h>

#include <linux/i2c.h>

#include <linux/platform_device.h>

#include <linux/regulator/consumer.h>

#include <linux/slab.h>

#include <sound/core.h>

#include <sound/pcm.h>

#include <sound/pcm_params.h>

#include <sound/soc.h>

#include <sound/soc-dapm.h>

#include <sound/initval.h>

#include <sound/tlv.h>



#include "wm8741.h"



static struct snd_soc_codec *wm8741_codec;

struct snd_soc_codec_device soc_codec_dev_wm8741;



#define WM8741_NUM_SUPPLIES 2

static const char *wm8741_supply_names[WM8741_NUM_SUPPLIES] = {

	"AVDD",

	"DVDD",

};



#define WM8741_NUM_RATES 4



/* codec private data */

struct wm8741_priv {

	struct snd_soc_codec codec;

	u16 reg_cache[WM8741_REGISTER_COUNT];

	struct regulator_bulk_data supplies[WM8741_NUM_SUPPLIES];

	unsigned int sysclk;

	unsigned int rate_constraint_list[WM8741_NUM_RATES];

	struct snd_pcm_hw_constraint_list rate_constraint;

};



static const u16 wm8741_reg_defaults[WM8741_REGISTER_COUNT] = {

	0x0000,     /* R0  - DACLLSB Attenuation */

	0x0000,     /* R1  - DACLMSB Attenuation */

	0x0000,     /* R2  - DACRLSB Attenuation */

	0x0000,     /* R3  - DACRMSB Attenuation */

	0x0000,     /* R4  - Volume Control */

	0x000A,     /* R5  - Format Control */

	0x0000,     /* R6  - Filter Control */

	0x0000,     /* R7  - Mode Control 1 */

	0x0002,     /* R8  - Mode Control 2 */

	0x0000,	    /* R9  - Reset */

	0x0002,     /* R32 - ADDITONAL_CONTROL_1 */

};





static int wm8741_reset(struct snd_soc_codec *codec)

{

	return snd_soc_write(codec, WM8741_RESET, 0);

}



static const DECLARE_TLV_DB_SCALE(dac_tlv_fine, -12700, 13, 0);

static const DECLARE_TLV_DB_SCALE(dac_tlv, -12700, 400, 0);



static const struct snd_kcontrol_new wm8741_snd_controls[] = {

SOC_DOUBLE_R_TLV("Fine Playback Volume", WM8741_DACLLSB_ATTENUATION,

		 WM8741_DACRLSB_ATTENUATION, 1, 255, 1, dac_tlv_fine),

SOC_DOUBLE_R_TLV("Playback Volume", WM8741_DACLMSB_ATTENUATION,

		 WM8741_DACRMSB_ATTENUATION, 0, 511, 1, dac_tlv),

};



static const struct snd_soc_dapm_widget wm8741_dapm_widgets[] = {

SND_SOC_DAPM_DAC("DACL", "Playback", SND_SOC_NOPM, 0, 0),

SND_SOC_DAPM_DAC("DACR", "Playback", SND_SOC_NOPM, 0, 0),

SND_SOC_DAPM_OUTPUT("VOUTLP"),

SND_SOC_DAPM_OUTPUT("VOUTLN"),

SND_SOC_DAPM_OUTPUT("VOUTRP"),

SND_SOC_DAPM_OUTPUT("VOUTRN"),

};



static const struct snd_soc_dapm_route intercon[] = {

	{ "VOUTLP", NULL, "DACL" },

	{ "VOUTLN", NULL, "DACL" },

	{ "VOUTRP", NULL, "DACR" },

	{ "VOUTRN", NULL, "DACR" },

};



static int wm8741_add_widgets(struct snd_soc_codec *codec)

{

	snd_soc_dapm_new_controls(codec, wm8741_dapm_widgets,

				  ARRAY_SIZE(wm8741_dapm_widgets));



	snd_soc_dapm_add_routes(codec, intercon, ARRAY_SIZE(intercon));



	return 0;

}



static struct {

	int value;

	int ratio;

} lrclk_ratios[WM8741_NUM_RATES] = {

	{ 1, 256 },

	{ 2, 384 },

	{ 3, 512 },

	{ 4, 768 },

};





static int wm8741_startup(struct snd_pcm_substream *substream,

			  struct snd_soc_dai *dai)

{

	struct snd_soc_codec *codec = dai->codec;

	struct wm8741_priv *wm8741 = snd_soc_codec_get_drvdata(codec);



	/* The set of sample rates that can be supported depends on the

	 * MCLK supplied to the CODEC - enforce this.

	 */

	if (!wm8741->sysclk) {

		dev_err(codec->dev,

			"No MCLK configured, call set_sysclk() on init\n");

		return -EINVAL;

	}



	snd_pcm_hw_constraint_list(substream->runtime, 0,

				   SNDRV_PCM_HW_PARAM_RATE,

				   &wm8741->rate_constraint);



	return 0;

}



static int wm8741_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_device *socdev = rtd->socdev;

	struct snd_soc_codec *codec = socdev->card->codec;

	struct wm8741_priv *wm8741 = snd_soc_codec_get_drvdata(codec);

	u16 iface = snd_soc_read(codec, WM8741_FORMAT_CONTROL) & 0x1FC;

	int i;



	/* Find a supported LRCLK ratio */

	for (i = 0; i < ARRAY_SIZE(lrclk_ratios); i++) {

		if (wm8741->sysclk / params_rate(params) ==

		    lrclk_ratios[i].ratio)

			break;

	}



	/* Should never happen, should be handled by constraints */

	if (i == ARRAY_SIZE(lrclk_ratios)) {

		dev_err(codec->dev, "MCLK/fs ratio %d unsupported\n",

			wm8741->sysclk / params_rate(params));

		return -EINVAL;

	}



	/* bit size */

	switch (params_format(params)) {

	case SNDRV_PCM_FORMAT_S16_LE:

		break;

	case SNDRV_PCM_FORMAT_S20_3LE:

		iface |= 0x0001;

		break;

	case SNDRV_PCM_FORMAT_S24_LE:

		iface |= 0x0002;

		break;

	case SNDRV_PCM_FORMAT_S32_LE:

		iface |= 0x0003;

		break;

	default:

		dev_dbg(codec->dev, "wm8741_hw_params:    Unsupported bit size param = %d",

			params_format(params));

		return -EINVAL;

	}



	dev_dbg(codec->dev, "wm8741_hw_params:    bit size param = %d",

		params_format(params));



	snd_soc_write(codec, WM8741_FORMAT_CONTROL, iface);

	return 0;

}



static int wm8741_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 wm8741_priv *wm8741 = snd_soc_codec_get_drvdata(codec);

	unsigned int val;

	int i;



	dev_dbg(codec->dev, "wm8741_set_dai_sysclk info: freq=%dHz\n", freq);



	wm8741->sysclk = freq;



	wm8741->rate_constraint.count = 0;



	for (i = 0; i < ARRAY_SIZE(lrclk_ratios); i++) {

		dev_dbg(codec->dev, "index = %d, ratio = %d, freq = %d",

				i, lrclk_ratios[i].ratio, freq);



		val = freq / lrclk_ratios[i].ratio;

		/* Check that it's a standard rate since core can't

		 * cope with others and having the odd rates confuses

		 * constraint matching.

		 */

		switch (val) {

		case 32000:

		case 44100:

		case 48000:

		case 64000:

		case 88200:

		case 96000:

			dev_dbg(codec->dev, "Supported sample rate: %dHz\n",

				val);

			wm8741->rate_constraint_list[i] = val;

			wm8741->rate_constraint.count++;

			break;

		default:

			dev_dbg(codec->dev, "Skipping sample rate: %dHz\n",

				val);

		}

	}



	/* Need at least one supported rate... */

	if (wm8741->rate_constraint.count == 0)

		return -EINVAL;



	return 0;

}



static int wm8741_set_dai_fmt(struct snd_soc_dai *codec_dai,

		unsigned int fmt)

{

	struct snd_soc_codec *codec = codec_dai->codec;

	u16 iface = snd_soc_read(codec, WM8741_FORMAT_CONTROL) & 0x1C3;



	/* check master/slave audio interface */

	switch (fmt & SND_SOC_DAIFMT_MASTER_MASK) {

	case SND_SOC_DAIFMT_CBS_CFS:

		break;

	default:

		return -EINVAL;

	}



	/* interface format */

	switch (fmt & SND_SOC_DAIFMT_FORMAT_MASK) {

	case SND_SOC_DAIFMT_I2S:

		iface |= 0x0008;

		break;

	case SND_SOC_DAIFMT_RIGHT_J:

		break;

	case SND_SOC_DAIFMT_LEFT_J:

		iface |= 0x0004;

		break;

	case SND_SOC_DAIFMT_DSP_A:

		iface |= 0x0003;

		break;

	case SND_SOC_DAIFMT_DSP_B:

		iface |= 0x0013;

		break;

	default:

		return -EINVAL;

	}



	/* clock inversion */

	switch (fmt & SND_SOC_DAIFMT_INV_MASK) {

	case SND_SOC_DAIFMT_NB_NF:

		break;

	case SND_SOC_DAIFMT_IB_IF:

		iface |= 0x0010;

		break;

	case SND_SOC_DAIFMT_IB_NF:

		iface |= 0x0020;

		break;

	case SND_SOC_DAIFMT_NB_IF:

		iface |= 0x0030;

		break;

	default:

		return -EINVAL;

	}





	dev_dbg(codec->dev, "wm8741_set_dai_fmt:    Format=%x, Clock Inv=%x\n",

				fmt & SND_SOC_DAIFMT_FORMAT_MASK,

				((fmt & SND_SOC_DAIFMT_INV_MASK)));



	snd_soc_write(codec, WM8741_FORMAT_CONTROL, iface);

	return 0;

}



#define WM8741_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)



#define WM8741_FORMATS (SNDRV_PCM_FMTBIT_S16_LE | SNDRV_PCM_FMTBIT_S20_3LE |\

			SNDRV_PCM_FMTBIT_S24_LE | SNDRV_PCM_FMTBIT_S32_LE)



static struct snd_soc_dai_ops wm8741_dai_ops = {

	.startup	= wm8741_startup,

	.hw_params	= wm8741_hw_params,

	.set_sysclk	= wm8741_set_dai_sysclk,

	.set_fmt	= wm8741_set_dai_fmt,

};



struct snd_soc_dai wm8741_dai = {

	.name = "WM8741",

	.playback = {

		.stream_name = "Playback",

		.channels_min = 2,  /* Mono modes not yet supported */

		.channels_max = 2,

		.rates = WM8741_RATES,

		.formats = WM8741_FORMATS,

	},

	.ops = &wm8741_dai_ops,

};

EXPORT_SYMBOL_GPL(wm8741_dai);



#ifdef CONFIG_PM

static int wm8741_resume(struct platform_device *pdev)

{

	struct snd_soc_device *socdev = platform_get_drvdata(pdev);

	struct snd_soc_codec *codec = socdev->card->codec;

	u16 *cache = codec->reg_cache;

	int i;



	/* RESTORE REG Cache */

	for (i = 0; i < WM8741_REGISTER_COUNT; i++) {

		if (cache[i] == wm8741_reg_defaults[i] || WM8741_RESET == i)

			continue;

		snd_soc_write(codec, i, cache[i]);

	}

	return 0;

}

#else

#define wm8741_suspend NULL

#define wm8741_resume NULL

#endif



static int wm8741_probe(struct platform_device *pdev)

{

	struct snd_soc_device *socdev = platform_get_drvdata(pdev);

	struct snd_soc_codec *codec;

	int ret = 0;



	if (wm8741_codec == NULL) {

		dev_err(&pdev->dev, "Codec device not registered\n");

		return -ENODEV;

	}



	socdev->card->codec = wm8741_codec;

	codec = wm8741_codec;



	/* register pcms */

	ret = snd_soc_new_pcms(socdev, SNDRV_DEFAULT_IDX1, SNDRV_DEFAULT_STR1);

	if (ret < 0) {

		dev_err(codec->dev, "failed to create pcms: %d\n", ret);

		goto pcm_err;

	}



	snd_soc_add_controls(codec, wm8741_snd_controls,

			     ARRAY_SIZE(wm8741_snd_controls));

	wm8741_add_widgets(codec);



	return ret;



pcm_err:

	return ret;

}



static int wm8741_remove(struct platform_device *pdev)

{

	struct snd_soc_device *socdev = platform_get_drvdata(pdev);



	snd_soc_free_pcms(socdev);

	snd_soc_dapm_free(socdev);



	return 0;

}



struct snd_soc_codec_device soc_codec_dev_wm8741 = {

	.probe =	wm8741_probe,

	.remove =	wm8741_remove,

	.resume =	wm8741_resume,

};

EXPORT_SYMBOL_GPL(soc_codec_dev_wm8741);



static int wm8741_register(struct wm8741_priv *wm8741,

			   enum snd_soc_control_type control)

{

	int ret;

	struct snd_soc_codec *codec = &wm8741->codec;

	int i;



	if (wm8741_codec) {

		dev_err(codec->dev, "Another WM8741 is registered\n");

		return -EINVAL;

	}



	mutex_init(&codec->mutex);

	INIT_LIST_HEAD(&codec->dapm_widgets);

	INIT_LIST_HEAD(&codec->dapm_paths);



	snd_soc_codec_set_drvdata(codec, wm8741);

	codec->name = "WM8741";

	codec->owner = THIS_MODULE;

	codec->bias_level = SND_SOC_BIAS_OFF;

	codec->set_bias_level = NULL;

	codec->dai = &wm8741_dai;

	codec->num_dai = 1;

	codec->reg_cache_size = WM8741_REGISTER_COUNT;

	codec->reg_cache = &wm8741->reg_cache;



	wm8741->rate_constraint.list = &wm8741->rate_constraint_list[0];

	wm8741->rate_constraint.count =

		ARRAY_SIZE(wm8741->rate_constraint_list);



	memcpy(codec->reg_cache, wm8741_reg_defaults,

		sizeof(wm8741->reg_cache));



	ret = snd_soc_codec_set_cache_io(codec, 7, 9, control);

	if (ret != 0) {

		dev_err(codec->dev, "Failed to set cache I/O: %d\n", ret);

		goto err;

	}



	for (i = 0; i < ARRAY_SIZE(wm8741->supplies); i++)

		wm8741->supplies[i].supply = wm8741_supply_names[i];



	ret = regulator_bulk_get(codec->dev, ARRAY_SIZE(wm8741->supplies),

				 wm8741->supplies);

	if (ret != 0) {

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

		goto err;

	}



	ret = regulator_bulk_enable(ARRAY_SIZE(wm8741->supplies),

				    wm8741->supplies);

	if (ret != 0) {

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

		goto err_get;

	}



	ret = wm8741_reset(codec);

	if (ret < 0) {

		dev_err(codec->dev, "Failed to issue reset\n");

		goto err_enable;

	}



	wm8741_dai.dev = codec->dev;



	/* Change some default settings - latch VU */

	wm8741->reg_cache[WM8741_DACLLSB_ATTENUATION] |= WM8741_UPDATELL;

	wm8741->reg_cache[WM8741_DACLMSB_ATTENUATION] |= WM8741_UPDATELM;

	wm8741->reg_cache[WM8741_DACRLSB_ATTENUATION] |= WM8741_UPDATERL;

	wm8741->reg_cache[WM8741_DACRLSB_ATTENUATION] |= WM8741_UPDATERM;



	wm8741_codec = codec;



	ret = snd_soc_register_codec(codec);

	if (ret != 0) {

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

		return ret;

	}



	ret = snd_soc_register_dai(&wm8741_dai);

	if (ret != 0) {

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

		snd_soc_unregister_codec(codec);

		return ret;

	}



	dev_dbg(codec->dev, "Successful registration\n");

	return 0;



err_enable:

	regulator_bulk_disable(ARRAY_SIZE(wm8741->supplies), wm8741->supplies);



err_get:

	regulator_bulk_free(ARRAY_SIZE(wm8741->supplies), wm8741->supplies);



err:

	kfree(wm8741);

	return ret;

}



static void wm8741_unregister(struct wm8741_priv *wm8741)

{

	regulator_bulk_free(ARRAY_SIZE(wm8741->supplies), wm8741->supplies);



	snd_soc_unregister_dai(&wm8741_dai);

	snd_soc_unregister_codec(&wm8741->codec);

	kfree(wm8741);

	wm8741_codec = NULL;

}



#if defined(CONFIG_I2C) || defined(CONFIG_I2C_MODULE)

static __devinit int wm8741_i2c_probe(struct i2c_client *i2c,

				      const struct i2c_device_id *id)

{

	struct wm8741_priv *wm8741;

	struct snd_soc_codec *codec;



	wm8741 = kzalloc(sizeof(struct wm8741_priv), GFP_KERNEL);

	if (wm8741 == NULL)

		return -ENOMEM;



	codec = &wm8741->codec;

	codec->hw_write = (hw_write_t)i2c_master_send;



	i2c_set_clientdata(i2c, wm8741);

	codec->control_data = i2c;



	codec->dev = &i2c->dev;



	return wm8741_register(wm8741, SND_SOC_I2C);

}



static __devexit int wm8741_i2c_remove(struct i2c_client *client)

{

	struct wm8741_priv *wm8741 = i2c_get_clientdata(client);

	wm8741_unregister(wm8741);

	return 0;

}



static const struct i2c_device_id wm8741_i2c_id[] = {

	{ "wm8741", 0 },

	{ }

};

MODULE_DEVICE_TABLE(i2c, wm8741_i2c_id);





static struct i2c_driver wm8741_i2c_driver = {

	.driver = {

		.name = "WM8741",

		.owner = THIS_MODULE,

	},

	.probe =    wm8741_i2c_probe,

	.remove =   __devexit_p(wm8741_i2c_remove),

	.id_table = wm8741_i2c_id,

};

#endif



static int __init wm8741_modinit(void)

{

	int ret;

#if defined(CONFIG_I2C) || defined(CONFIG_I2C_MODULE)

	ret = i2c_add_driver(&wm8741_i2c_driver);

	if (ret != 0) {

		printk(KERN_ERR "Failed to register WM8741 I2C driver: %d\n",

		       ret);

	}

#endif

	return 0;

}

module_init(wm8741_modinit);



static void __exit wm8741_exit(void)

{

#if defined(CONFIG_I2C) || defined(CONFIG_I2C_MODULE)

	i2c_del_driver(&wm8741_i2c_driver);

#endif

}

module_exit(wm8741_exit);



MODULE_DESCRIPTION("ASoC WM8741 driver");

MODULE_AUTHOR("Ian Lartey <ian@opensource.wolfsonmicro.com>");

MODULE_LICENSE("GPL");

sound/soc/codecs/wm8741.h

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