sound/soc/codecs/uda134x.c - kernel/msm-4.9 - Gitiles

 /*
  * uda134x.c  --  UDA134X ALSA SoC Codec driver
  *
  * Modifications by Christian Pellegrin <chripell@evolware.org>
  *
  * Copyright 2007 Dension Audio Systems Ltd.
  * Author: Zoltan Devai
  *
  * Based on the WM87xx drivers by Liam Girdwood and Richard Purdie
  *
  * 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/delay.h>
 #include <linux/slab.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/uda134x.h>
 #include <sound/l3.h>

 #include "uda134x.h"


 #define POWER_OFF_ON_STANDBY 1
 /*
   ALSA SOC usually puts the device in standby mode when it's not used
   for sometime. If you define POWER_OFF_ON_STANDBY the driver will
   turn off the ADC/DAC when this callback is invoked and turn it back
   on when needed. Unfortunately this will result in a very light bump
   (it can be audible only with good earphones). If this bothers you
   just comment this line, you will have slightly higher power
   consumption . Please note that sending the L3 command for ADC is
   enough to make the bump, so it doesn't make difference if you
   completely take off power from the codec.
  */

 #define UDA134X_RATES SNDRV_PCM_RATE_8000_48000
 #define UDA134X_FORMATS (SNDRV_PCM_FMTBIT_S8 | SNDRV_PCM_FMTBIT_S16_LE | \
 		SNDRV_PCM_FMTBIT_S18_3LE | SNDRV_PCM_FMTBIT_S20_3LE)

 struct uda134x_priv {
 	int sysclk;
 	int dai_fmt;

 	struct snd_pcm_substream *master_substream;
 	struct snd_pcm_substream *slave_substream;
 };

 /* In-data addresses are hard-coded into the reg-cache values */
 static const char uda134x_reg[UDA134X_REGS_NUM] = {
 	/* Extended address registers */
 	0x04, 0x04, 0x04, 0x00, 0x00, 0x00, 0x00, 0x00,
 	/* Status, data regs */
 	0x00, 0x83, 0x00, 0x40, 0x80, 0x00,
 };

 /*
  * The codec has no support for reading its registers except for peak level...
  */
 static inline unsigned int uda134x_read_reg_cache(struct snd_soc_codec *codec,
 	unsigned int reg)
 {
 	u8 *cache = codec->reg_cache;

 	if (reg >= UDA134X_REGS_NUM)
 		return -1;
 	return cache[reg];
 }

 /*
  * Write the register cache
  */
 static inline void uda134x_write_reg_cache(struct snd_soc_codec *codec,
 	u8 reg, unsigned int value)
 {
 	u8 *cache = codec->reg_cache;

 	if (reg >= UDA134X_REGS_NUM)
 		return;
 	cache[reg] = value;
 }

 /*
  * Write to the uda134x registers
  *
  */
 static int uda134x_write(struct snd_soc_codec *codec, unsigned int reg,
 	unsigned int value)
 {
 	int ret;
 	u8 addr;
 	u8 data = value;
 	struct uda134x_platform_data *pd = codec->control_data;

 	pr_debug("%s reg: %02X, value:%02X\n", __func__, reg, value);

 	if (reg >= UDA134X_REGS_NUM) {
 		printk(KERN_ERR "%s unknown register: reg: %u",
 		       __func__, reg);
 		return -EINVAL;
 	}

 	uda134x_write_reg_cache(codec, reg, value);

 	switch (reg) {
 	case UDA134X_STATUS0:
 	case UDA134X_STATUS1:
 		addr = UDA134X_STATUS_ADDR;
 		break;
 	case UDA134X_DATA000:
 	case UDA134X_DATA001:
 	case UDA134X_DATA010:
 		addr = UDA134X_DATA0_ADDR;
 		break;
 	case UDA134X_DATA1:
 		addr = UDA134X_DATA1_ADDR;
 		break;
 	default:
 		/* It's an extended address register */
 		addr =  (reg | UDA134X_EXTADDR_PREFIX);

 		ret = l3_write(&pd->l3,
 			       UDA134X_DATA0_ADDR, &addr, 1);
 		if (ret != 1)
 			return -EIO;

 		addr = UDA134X_DATA0_ADDR;
 		data = (value | UDA134X_EXTDATA_PREFIX);
 		break;
 	}

 	ret = l3_write(&pd->l3,
 		       addr, &data, 1);
 	if (ret != 1)
 		return -EIO;

 	return 0;
 }

 static inline void uda134x_reset(struct snd_soc_codec *codec)
 {
 	u8 reset_reg = uda134x_read_reg_cache(codec, UDA134X_STATUS0);
 	uda134x_write(codec, UDA134X_STATUS0, reset_reg | (1<<6));
 	msleep(1);
 	uda134x_write(codec, UDA134X_STATUS0, reset_reg & ~(1<<6));
 }

 static int uda134x_mute(struct snd_soc_dai *dai, int mute)
 {
 	struct snd_soc_codec *codec = dai->codec;
 	u8 mute_reg = uda134x_read_reg_cache(codec, UDA134X_DATA010);

 	pr_debug("%s mute: %d\n", __func__, mute);

 	if (mute)
 		mute_reg |= (1<<2);
 	else
 		mute_reg &= ~(1<<2);

 	uda134x_write(codec, UDA134X_DATA010, mute_reg);

 	return 0;
 }

 static int uda134x_startup(struct snd_pcm_substream *substream,
 	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 uda134x_priv *uda134x = codec->private_data;
 	struct snd_pcm_runtime *master_runtime;

 	if (uda134x->master_substream) {
 		master_runtime = uda134x->master_substream->runtime;

 		pr_debug("%s constraining to %d bits at %d\n", __func__,
 			 master_runtime->sample_bits,
 			 master_runtime->rate);

 		snd_pcm_hw_constraint_minmax(substream->runtime,
 					     SNDRV_PCM_HW_PARAM_RATE,
 					     master_runtime->rate,
 					     master_runtime->rate);

 		snd_pcm_hw_constraint_minmax(substream->runtime,
 					     SNDRV_PCM_HW_PARAM_SAMPLE_BITS,
 					     master_runtime->sample_bits,
 					     master_runtime->sample_bits);

 		uda134x->slave_substream = substream;
 	} else
 		uda134x->master_substream = substream;

 	return 0;
 }

 static void uda134x_shutdown(struct snd_pcm_substream *substream,
 	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 uda134x_priv *uda134x = codec->private_data;

 	if (uda134x->master_substream == substream)
 		uda134x->master_substream = uda134x->slave_substream;

 	uda134x->slave_substream = NULL;
 }

 static int uda134x_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 uda134x_priv *uda134x = codec->private_data;
 	u8 hw_params;

 	if (substream == uda134x->slave_substream) {
 		pr_debug("%s ignoring hw_params for slave substream\n",
 			 __func__);
 		return 0;
 	}

 	hw_params = uda134x_read_reg_cache(codec, UDA134X_STATUS0);
 	hw_params &= STATUS0_SYSCLK_MASK;
 	hw_params &= STATUS0_DAIFMT_MASK;

 	pr_debug("%s sysclk: %d, rate:%d\n", __func__,
 		 uda134x->sysclk, params_rate(params));

 	/* set SYSCLK / fs ratio */
 	switch (uda134x->sysclk / params_rate(params)) {
 	case 512:
 		break;
 	case 384:
 		hw_params |= (1<<4);
 		break;
 	case 256:
 		hw_params |= (1<<5);
 		break;
 	default:
 		printk(KERN_ERR "%s unsupported fs\n", __func__);
 		return -EINVAL;
 	}

 	pr_debug("%s dai_fmt: %d, params_format:%d\n", __func__,
 		 uda134x->dai_fmt, params_format(params));

 	/* set DAI format and word length */
 	switch (uda134x->dai_fmt & SND_SOC_DAIFMT_FORMAT_MASK) {
 	case SND_SOC_DAIFMT_I2S:
 		break;
 	case SND_SOC_DAIFMT_RIGHT_J:
 		switch (params_format(params)) {
 		case SNDRV_PCM_FORMAT_S16_LE:
 			hw_params |= (1<<1);
 			break;
 		case SNDRV_PCM_FORMAT_S18_3LE:
 			hw_params |= (1<<2);
 			break;
 		case SNDRV_PCM_FORMAT_S20_3LE:
 			hw_params |= ((1<<2) | (1<<1));
 			break;
 		default:
 			printk(KERN_ERR "%s unsupported format (right)\n",
 			       __func__);
 			return -EINVAL;
 		}
 		break;
 	case SND_SOC_DAIFMT_LEFT_J:
 		hw_params |= (1<<3);
 		break;
 	default:
 		printk(KERN_ERR "%s unsupported format\n", __func__);
 		return -EINVAL;
 	}

 	uda134x_write(codec, UDA134X_STATUS0, hw_params);

 	return 0;
 }

 static int uda134x_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 uda134x_priv *uda134x = codec->private_data;

 	pr_debug("%s clk_id: %d, freq: %u, dir: %d\n", __func__,
 		 clk_id, freq, dir);

 	/* Anything between 256fs*8Khz and 512fs*48Khz should be acceptable
 	   because the codec is slave. Of course limitations of the clock
 	   master (the IIS controller) apply.
 	   We'll error out on set_hw_params if it's not OK */
 	if ((freq >= (256 * 8000)) && (freq <= (512 * 48000))) {
 		uda134x->sysclk = freq;
 		return 0;
 	}

 	printk(KERN_ERR "%s unsupported sysclk\n", __func__);
 	return -EINVAL;
 }

 static int uda134x_set_dai_fmt(struct snd_soc_dai *codec_dai,
 			       unsigned int fmt)
 {
 	struct snd_soc_codec *codec = codec_dai->codec;
 	struct uda134x_priv *uda134x = codec->private_data;

 	pr_debug("%s fmt: %08X\n", __func__, fmt);

 	/* codec supports only full slave mode */
 	if ((fmt & SND_SOC_DAIFMT_MASTER_MASK) != SND_SOC_DAIFMT_CBS_CFS) {
 		printk(KERN_ERR "%s unsupported slave mode\n", __func__);
 		return -EINVAL;
 	}

 	/* no support for clock inversion */
 	if ((fmt & SND_SOC_DAIFMT_INV_MASK) != SND_SOC_DAIFMT_NB_NF) {
 		printk(KERN_ERR "%s unsupported clock inversion\n", __func__);
 		return -EINVAL;
 	}

 	/* We can't setup DAI format here as it depends on the word bit num */
 	/* so let's just store the value for later */
 	uda134x->dai_fmt = fmt;

 	return 0;
 }

 static int uda134x_set_bias_level(struct snd_soc_codec *codec,
 				  enum snd_soc_bias_level level)
 {
 	u8 reg;
 	struct uda134x_platform_data *pd = codec->control_data;
 	int i;
 	u8 *cache = codec->reg_cache;

 	pr_debug("%s bias level %d\n", __func__, level);

 	switch (level) {
 	case SND_SOC_BIAS_ON:
 		/* ADC, DAC on */
 		reg = uda134x_read_reg_cache(codec, UDA134X_STATUS1);
 		uda134x_write(codec, UDA134X_STATUS1, reg | 0x03);
 		break;
 	case SND_SOC_BIAS_PREPARE:
 		/* power on */
 		if (pd->power) {
 			pd->power(1);
 			/* Sync reg_cache with the hardware */
 			for (i = 0; i < ARRAY_SIZE(uda134x_reg); i++)
 				codec->write(codec, i, *cache++);
 		}
 		break;
 	case SND_SOC_BIAS_STANDBY:
 		/* ADC, DAC power off */
 		reg = uda134x_read_reg_cache(codec, UDA134X_STATUS1);
 		uda134x_write(codec, UDA134X_STATUS1, reg & ~(0x03));
 		break;
 	case SND_SOC_BIAS_OFF:
 		/* power off */
 		if (pd->power)
 			pd->power(0);
 		break;
 	}
 	codec->bias_level = level;
 	return 0;
 }

 static const char *uda134x_dsp_setting[] = {"Flat", "Minimum1",
 					    "Minimum2", "Maximum"};
 static const char *uda134x_deemph[] = {"None", "32Khz", "44.1Khz", "48Khz"};
 static const char *uda134x_mixmode[] = {"Differential", "Analog1",
 					"Analog2", "Both"};

 static const struct soc_enum uda134x_mixer_enum[] = {
 SOC_ENUM_SINGLE(UDA134X_DATA010, 0, 0x04, uda134x_dsp_setting),
 SOC_ENUM_SINGLE(UDA134X_DATA010, 3, 0x04, uda134x_deemph),
 SOC_ENUM_SINGLE(UDA134X_EA010, 0, 0x04, uda134x_mixmode),
 };

 static const struct snd_kcontrol_new uda1341_snd_controls[] = {
 SOC_SINGLE("Master Playback Volume", UDA134X_DATA000, 0, 0x3F, 1),
 SOC_SINGLE("Capture Volume", UDA134X_EA010, 2, 0x07, 0),
 SOC_SINGLE("Analog1 Volume", UDA134X_EA000, 0, 0x1F, 1),
 SOC_SINGLE("Analog2 Volume", UDA134X_EA001, 0, 0x1F, 1),

 SOC_SINGLE("Mic Sensitivity", UDA134X_EA010, 2, 7, 0),
 SOC_SINGLE("Mic Volume", UDA134X_EA101, 0, 0x1F, 0),

 SOC_SINGLE("Tone Control - Bass", UDA134X_DATA001, 2, 0xF, 0),
 SOC_SINGLE("Tone Control - Treble", UDA134X_DATA001, 0, 3, 0),

 SOC_ENUM("Sound Processing Filter", uda134x_mixer_enum[0]),
 SOC_ENUM("PCM Playback De-emphasis", uda134x_mixer_enum[1]),
 SOC_ENUM("Input Mux", uda134x_mixer_enum[2]),

 SOC_SINGLE("AGC Switch", UDA134X_EA100, 4, 1, 0),
 SOC_SINGLE("AGC Target Volume", UDA134X_EA110, 0, 0x03, 1),
 SOC_SINGLE("AGC Timing", UDA134X_EA110, 2, 0x07, 0),

 SOC_SINGLE("DAC +6dB Switch", UDA134X_STATUS1, 6, 1, 0),
 SOC_SINGLE("ADC +6dB Switch", UDA134X_STATUS1, 5, 1, 0),
 SOC_SINGLE("ADC Polarity Switch", UDA134X_STATUS1, 4, 1, 0),
 SOC_SINGLE("DAC Polarity Switch", UDA134X_STATUS1, 3, 1, 0),
 SOC_SINGLE("Double Speed Playback Switch", UDA134X_STATUS1, 2, 1, 0),
 SOC_SINGLE("DC Filter Enable Switch", UDA134X_STATUS0, 0, 1, 0),
 };

 static const struct snd_kcontrol_new uda1340_snd_controls[] = {
 SOC_SINGLE("Master Playback Volume", UDA134X_DATA000, 0, 0x3F, 1),

 SOC_SINGLE("Tone Control - Bass", UDA134X_DATA001, 2, 0xF, 0),
 SOC_SINGLE("Tone Control - Treble", UDA134X_DATA001, 0, 3, 0),

 SOC_ENUM("Sound Processing Filter", uda134x_mixer_enum[0]),
 SOC_ENUM("PCM Playback De-emphasis", uda134x_mixer_enum[1]),

 SOC_SINGLE("DC Filter Enable Switch", UDA134X_STATUS0, 0, 1, 0),
 };

 static struct snd_soc_dai_ops uda134x_dai_ops = {
 	.startup	= uda134x_startup,
 	.shutdown	= uda134x_shutdown,
 	.hw_params	= uda134x_hw_params,
 	.digital_mute	= uda134x_mute,
 	.set_sysclk	= uda134x_set_dai_sysclk,
 	.set_fmt	= uda134x_set_dai_fmt,
 };

 struct snd_soc_dai uda134x_dai = {
 	.name = "UDA134X",
 	/* playback capabilities */
 	.playback = {
 		.stream_name = "Playback",
 		.channels_min = 1,
 		.channels_max = 2,
 		.rates = UDA134X_RATES,
 		.formats = UDA134X_FORMATS,
 	},
 	/* capture capabilities */
 	.capture = {
 		.stream_name = "Capture",
 		.channels_min = 1,
 		.channels_max = 2,
 		.rates = UDA134X_RATES,
 		.formats = UDA134X_FORMATS,
 	},
 	/* pcm operations */
 	.ops = &uda134x_dai_ops,
 };
 EXPORT_SYMBOL(uda134x_dai);


 static int uda134x_soc_probe(struct platform_device *pdev)
 {
 	struct snd_soc_device *socdev = platform_get_drvdata(pdev);
 	struct snd_soc_codec *codec;
 	struct uda134x_priv *uda134x;
 	void *codec_setup_data = socdev->codec_data;
 	int ret = -ENOMEM;
 	struct uda134x_platform_data *pd;

 	printk(KERN_INFO "UDA134X SoC Audio Codec\n");

 	if (!codec_setup_data) {
 		printk(KERN_ERR "UDA134X SoC codec: "
 		       "missing L3 bitbang function\n");
 		return -ENODEV;
 	}

 	pd = codec_setup_data;
 	switch (pd->model) {
 	case UDA134X_UDA1340:
 	case UDA134X_UDA1341:
 	case UDA134X_UDA1344:
 		break;
 	default:
 		printk(KERN_ERR "UDA134X SoC codec: "
 		       "unsupported model %d\n",
 			pd->model);
 		return -EINVAL;
 	}

 	socdev->card->codec = kzalloc(sizeof(struct snd_soc_codec), GFP_KERNEL);
 	if (socdev->card->codec == NULL)
 		return ret;

 	codec = socdev->card->codec;

 	uda134x = kzalloc(sizeof(struct uda134x_priv), GFP_KERNEL);
 	if (uda134x == NULL)
 		goto priv_err;
 	codec->private_data = uda134x;

 	codec->reg_cache = kmemdup(uda134x_reg, sizeof(uda134x_reg),
 				   GFP_KERNEL);
 	if (codec->reg_cache == NULL)
 		goto reg_err;

 	mutex_init(&codec->mutex);

 	codec->reg_cache_size = sizeof(uda134x_reg);
 	codec->reg_cache_step = 1;

 	codec->name = "UDA134X";
 	codec->owner = THIS_MODULE;
 	codec->dai = &uda134x_dai;
 	codec->num_dai = 1;
 	codec->read = uda134x_read_reg_cache;
 	codec->write = uda134x_write;
 #ifdef POWER_OFF_ON_STANDBY
 	codec->set_bias_level = uda134x_set_bias_level;
 #endif
 	INIT_LIST_HEAD(&codec->dapm_widgets);
 	INIT_LIST_HEAD(&codec->dapm_paths);

 	codec->control_data = codec_setup_data;

 	if (pd->power)
 		pd->power(1);

 	uda134x_reset(codec);

 	/* register pcms */
 	ret = snd_soc_new_pcms(socdev, SNDRV_DEFAULT_IDX1, SNDRV_DEFAULT_STR1);
 	if (ret < 0) {
 		printk(KERN_ERR "UDA134X: failed to register pcms\n");
 		goto pcm_err;
 	}

 	switch (pd->model) {
 	case UDA134X_UDA1340:
 	case UDA134X_UDA1344:
 		ret = snd_soc_add_controls(codec, uda1340_snd_controls,
 					ARRAY_SIZE(uda1340_snd_controls));
 	break;
 	case UDA134X_UDA1341:
 		ret = snd_soc_add_controls(codec, uda1341_snd_controls,
 					ARRAY_SIZE(uda1341_snd_controls));
 	break;
 	default:
 		printk(KERN_ERR "%s unknown codec type: %d",
 			__func__, pd->model);
 	return -EINVAL;
 	}

 	if (ret < 0) {
 		printk(KERN_ERR "UDA134X: failed to register controls\n");
 		goto pcm_err;
 	}

 	return 0;

 pcm_err:
 	kfree(codec->reg_cache);
 reg_err:
 	kfree(codec->private_data);
 priv_err:
 	kfree(codec);
 	return ret;
 }

 /* power down chip */
 static int uda134x_soc_remove(struct platform_device *pdev)
 {
 	struct snd_soc_device *socdev = platform_get_drvdata(pdev);
 	struct snd_soc_codec *codec = socdev->card->codec;

 	uda134x_set_bias_level(codec, SND_SOC_BIAS_STANDBY);
 	uda134x_set_bias_level(codec, SND_SOC_BIAS_OFF);

 	snd_soc_free_pcms(socdev);
 	snd_soc_dapm_free(socdev);

 	kfree(codec->private_data);
 	kfree(codec->reg_cache);
 	kfree(codec);

 	return 0;
 }

 #if defined(CONFIG_PM)
 static int uda134x_soc_suspend(struct platform_device *pdev,
 						pm_message_t state)
 {
 	struct snd_soc_device *socdev = platform_get_drvdata(pdev);
 	struct snd_soc_codec *codec = socdev->card->codec;

 	uda134x_set_bias_level(codec, SND_SOC_BIAS_STANDBY);
 	uda134x_set_bias_level(codec, SND_SOC_BIAS_OFF);
 	return 0;
 }

 static int uda134x_soc_resume(struct platform_device *pdev)
 {
 	struct snd_soc_device *socdev = platform_get_drvdata(pdev);
 	struct snd_soc_codec *codec = socdev->card->codec;

 	uda134x_set_bias_level(codec, SND_SOC_BIAS_PREPARE);
 	uda134x_set_bias_level(codec, SND_SOC_BIAS_ON);
 	return 0;
 }
 #else
 #define uda134x_soc_suspend NULL
 #define uda134x_soc_resume NULL
 #endif /* CONFIG_PM */

 struct snd_soc_codec_device soc_codec_dev_uda134x = {
 	.probe =        uda134x_soc_probe,
 	.remove =       uda134x_soc_remove,
 	.suspend =      uda134x_soc_suspend,
 	.resume =       uda134x_soc_resume,
 };
 EXPORT_SYMBOL_GPL(soc_codec_dev_uda134x);

 static int __init uda134x_init(void)
 {
 	return snd_soc_register_dai(&uda134x_dai);
 }
 module_init(uda134x_init);

 static void __exit uda134x_exit(void)
 {
 	snd_soc_unregister_dai(&uda134x_dai);
 }
 module_exit(uda134x_exit);

 MODULE_DESCRIPTION("UDA134X ALSA soc codec driver");
 MODULE_AUTHOR("Zoltan Devai, Christian Pellegrin <chripell@evolware.org>");
 MODULE_LICENSE("GPL");
	/*
	* uda134x.c -- UDA134X ALSA SoC Codec driver
	*
	* Modifications by Christian Pellegrin <chripell@evolware.org>
	*
	* Copyright 2007 Dension Audio Systems Ltd.
	* Author: Zoltan Devai
	*
	* Based on the WM87xx drivers by Liam Girdwood and Richard Purdie
	*
	* 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/delay.h>
	#include <linux/slab.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/uda134x.h>
	#include <sound/l3.h>

	#include "uda134x.h"


	#define POWER_OFF_ON_STANDBY 1
	/*
	ALSA SOC usually puts the device in standby mode when it's not used
	for sometime. If you define POWER_OFF_ON_STANDBY the driver will
	turn off the ADC/DAC when this callback is invoked and turn it back
	on when needed. Unfortunately this will result in a very light bump
	(it can be audible only with good earphones). If this bothers you
	just comment this line, you will have slightly higher power
	consumption . Please note that sending the L3 command for ADC is
	enough to make the bump, so it doesn't make difference if you
	completely take off power from the codec.
	*/

	#define UDA134X_RATES SNDRV_PCM_RATE_8000_48000
	#define UDA134X_FORMATS (SNDRV_PCM_FMTBIT_S8 \| SNDRV_PCM_FMTBIT_S16_LE \| \
	SNDRV_PCM_FMTBIT_S18_3LE \| SNDRV_PCM_FMTBIT_S20_3LE)

	struct uda134x_priv {
	int sysclk;
	int dai_fmt;

	struct snd_pcm_substream *master_substream;
	struct snd_pcm_substream *slave_substream;
	};

	/* In-data addresses are hard-coded into the reg-cache values */
	static const char uda134x_reg[UDA134X_REGS_NUM] = {
	/* Extended address registers */
	0x04, 0x04, 0x04, 0x00, 0x00, 0x00, 0x00, 0x00,
	/* Status, data regs */
	0x00, 0x83, 0x00, 0x40, 0x80, 0x00,
	};

	/*
	* The codec has no support for reading its registers except for peak level...
	*/
	static inline unsigned int uda134x_read_reg_cache(struct snd_soc_codec *codec,
	unsigned int reg)
	{
	u8 *cache = codec->reg_cache;

	if (reg >= UDA134X_REGS_NUM)
	return -1;
	return cache[reg];
	}

	/*
	* Write the register cache
	*/
	static inline void uda134x_write_reg_cache(struct snd_soc_codec *codec,
	u8 reg, unsigned int value)
	{
	u8 *cache = codec->reg_cache;

	if (reg >= UDA134X_REGS_NUM)
	return;
	cache[reg] = value;
	}

	/*
	* Write to the uda134x registers
	*
	*/
	static int uda134x_write(struct snd_soc_codec *codec, unsigned int reg,
	unsigned int value)
	{
	int ret;
	u8 addr;
	u8 data = value;
	struct uda134x_platform_data *pd = codec->control_data;

	pr_debug("%s reg: %02X, value:%02X\n", __func__, reg, value);

	if (reg >= UDA134X_REGS_NUM) {
	printk(KERN_ERR "%s unknown register: reg: %u",
	__func__, reg);
	return -EINVAL;
	}

	uda134x_write_reg_cache(codec, reg, value);

	switch (reg) {
	case UDA134X_STATUS0:
	case UDA134X_STATUS1:
	addr = UDA134X_STATUS_ADDR;
	break;
	case UDA134X_DATA000:
	case UDA134X_DATA001:
	case UDA134X_DATA010:
	addr = UDA134X_DATA0_ADDR;
	break;
	case UDA134X_DATA1:
	addr = UDA134X_DATA1_ADDR;
	break;
	default:
	/* It's an extended address register */
	addr = (reg \| UDA134X_EXTADDR_PREFIX);

	ret = l3_write(&pd->l3,
	UDA134X_DATA0_ADDR, &addr, 1);
	if (ret != 1)
	return -EIO;

	addr = UDA134X_DATA0_ADDR;
	data = (value \| UDA134X_EXTDATA_PREFIX);
	break;
	}

	ret = l3_write(&pd->l3,
	addr, &data, 1);
	if (ret != 1)
	return -EIO;

	return 0;
	}

	static inline void uda134x_reset(struct snd_soc_codec *codec)
	{
	u8 reset_reg = uda134x_read_reg_cache(codec, UDA134X_STATUS0);
	uda134x_write(codec, UDA134X_STATUS0, reset_reg \| (1<<6));
	msleep(1);
	uda134x_write(codec, UDA134X_STATUS0, reset_reg & ~(1<<6));
	}

	static int uda134x_mute(struct snd_soc_dai *dai, int mute)
	{
	struct snd_soc_codec *codec = dai->codec;
	u8 mute_reg = uda134x_read_reg_cache(codec, UDA134X_DATA010);

	pr_debug("%s mute: %d\n", __func__, mute);

	if (mute)
	mute_reg \|= (1<<2);
	else
	mute_reg &= ~(1<<2);

	uda134x_write(codec, UDA134X_DATA010, mute_reg);

	return 0;
	}

	static int uda134x_startup(struct snd_pcm_substream *substream,
	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 uda134x_priv *uda134x = codec->private_data;
	struct snd_pcm_runtime *master_runtime;

	if (uda134x->master_substream) {
	master_runtime = uda134x->master_substream->runtime;

	pr_debug("%s constraining to %d bits at %d\n", __func__,
	master_runtime->sample_bits,
	master_runtime->rate);

	snd_pcm_hw_constraint_minmax(substream->runtime,
	SNDRV_PCM_HW_PARAM_RATE,
	master_runtime->rate,
	master_runtime->rate);

	snd_pcm_hw_constraint_minmax(substream->runtime,
	SNDRV_PCM_HW_PARAM_SAMPLE_BITS,
	master_runtime->sample_bits,
	master_runtime->sample_bits);

	uda134x->slave_substream = substream;
	} else
	uda134x->master_substream = substream;

	return 0;
	}

	static void uda134x_shutdown(struct snd_pcm_substream *substream,
	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 uda134x_priv *uda134x = codec->private_data;

	if (uda134x->master_substream == substream)
	uda134x->master_substream = uda134x->slave_substream;

	uda134x->slave_substream = NULL;
	}

	static int uda134x_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 uda134x_priv *uda134x = codec->private_data;
	u8 hw_params;

	if (substream == uda134x->slave_substream) {
	pr_debug("%s ignoring hw_params for slave substream\n",
	__func__);
	return 0;
	}

	hw_params = uda134x_read_reg_cache(codec, UDA134X_STATUS0);
	hw_params &= STATUS0_SYSCLK_MASK;
	hw_params &= STATUS0_DAIFMT_MASK;

	pr_debug("%s sysclk: %d, rate:%d\n", __func__,
	uda134x->sysclk, params_rate(params));

	/* set SYSCLK / fs ratio */
	switch (uda134x->sysclk / params_rate(params)) {
	case 512:
	break;
	case 384:
	hw_params \|= (1<<4);
	break;
	case 256:
	hw_params \|= (1<<5);
	break;
	default:
	printk(KERN_ERR "%s unsupported fs\n", __func__);
	return -EINVAL;
	}

	pr_debug("%s dai_fmt: %d, params_format:%d\n", __func__,
	uda134x->dai_fmt, params_format(params));

	/* set DAI format and word length */
	switch (uda134x->dai_fmt & SND_SOC_DAIFMT_FORMAT_MASK) {
	case SND_SOC_DAIFMT_I2S:
	break;
	case SND_SOC_DAIFMT_RIGHT_J:
	switch (params_format(params)) {
	case SNDRV_PCM_FORMAT_S16_LE:
	hw_params \|= (1<<1);
	break;
	case SNDRV_PCM_FORMAT_S18_3LE:
	hw_params \|= (1<<2);
	break;
	case SNDRV_PCM_FORMAT_S20_3LE:
	hw_params \|= ((1<<2) \| (1<<1));
	break;
	default:
	printk(KERN_ERR "%s unsupported format (right)\n",
	__func__);
	return -EINVAL;
	}
	break;
	case SND_SOC_DAIFMT_LEFT_J:
	hw_params \|= (1<<3);
	break;
	default:
	printk(KERN_ERR "%s unsupported format\n", __func__);
	return -EINVAL;
	}

	uda134x_write(codec, UDA134X_STATUS0, hw_params);

	return 0;
	}

	static int uda134x_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 uda134x_priv *uda134x = codec->private_data;

	pr_debug("%s clk_id: %d, freq: %u, dir: %d\n", __func__,
	clk_id, freq, dir);

	/* Anything between 256fs8Khz and 512fs48Khz should be acceptable
	because the codec is slave. Of course limitations of the clock
	master (the IIS controller) apply.
	We'll error out on set_hw_params if it's not OK */
	if ((freq >= (256 * 8000)) && (freq <= (512 * 48000))) {
	uda134x->sysclk = freq;
	return 0;
	}

	printk(KERN_ERR "%s unsupported sysclk\n", __func__);
	return -EINVAL;
	}

	static int uda134x_set_dai_fmt(struct snd_soc_dai *codec_dai,
	unsigned int fmt)
	{
	struct snd_soc_codec *codec = codec_dai->codec;
	struct uda134x_priv *uda134x = codec->private_data;

	pr_debug("%s fmt: %08X\n", __func__, fmt);

	/* codec supports only full slave mode */
	if ((fmt & SND_SOC_DAIFMT_MASTER_MASK) != SND_SOC_DAIFMT_CBS_CFS) {
	printk(KERN_ERR "%s unsupported slave mode\n", __func__);
	return -EINVAL;
	}

	/* no support for clock inversion */
	if ((fmt & SND_SOC_DAIFMT_INV_MASK) != SND_SOC_DAIFMT_NB_NF) {
	printk(KERN_ERR "%s unsupported clock inversion\n", __func__);
	return -EINVAL;
	}

	/* We can't setup DAI format here as it depends on the word bit num */
	/* so let's just store the value for later */
	uda134x->dai_fmt = fmt;

	return 0;
	}

	static int uda134x_set_bias_level(struct snd_soc_codec *codec,
	enum snd_soc_bias_level level)
	{
	u8 reg;
	struct uda134x_platform_data *pd = codec->control_data;
	int i;
	u8 *cache = codec->reg_cache;

	pr_debug("%s bias level %d\n", __func__, level);

	switch (level) {
	case SND_SOC_BIAS_ON:
	/* ADC, DAC on */
	reg = uda134x_read_reg_cache(codec, UDA134X_STATUS1);
	uda134x_write(codec, UDA134X_STATUS1, reg \| 0x03);
	break;
	case SND_SOC_BIAS_PREPARE:
	/* power on */
	if (pd->power) {
	pd->power(1);
	/* Sync reg_cache with the hardware */
	for (i = 0; i < ARRAY_SIZE(uda134x_reg); i++)
	codec->write(codec, i, *cache++);
	}
	break;
	case SND_SOC_BIAS_STANDBY:
	/* ADC, DAC power off */
	reg = uda134x_read_reg_cache(codec, UDA134X_STATUS1);
	uda134x_write(codec, UDA134X_STATUS1, reg & ~(0x03));
	break;
	case SND_SOC_BIAS_OFF:
	/* power off */
	if (pd->power)
	pd->power(0);
	break;
	}
	codec->bias_level = level;
	return 0;
	}

	static const char *uda134x_dsp_setting[] = {"Flat", "Minimum1",
	"Minimum2", "Maximum"};
	static const char *uda134x_deemph[] = {"None", "32Khz", "44.1Khz", "48Khz"};
	static const char *uda134x_mixmode[] = {"Differential", "Analog1",
	"Analog2", "Both"};

	static const struct soc_enum uda134x_mixer_enum[] = {
	SOC_ENUM_SINGLE(UDA134X_DATA010, 0, 0x04, uda134x_dsp_setting),
	SOC_ENUM_SINGLE(UDA134X_DATA010, 3, 0x04, uda134x_deemph),
	SOC_ENUM_SINGLE(UDA134X_EA010, 0, 0x04, uda134x_mixmode),
	};

	static const struct snd_kcontrol_new uda1341_snd_controls[] = {
	SOC_SINGLE("Master Playback Volume", UDA134X_DATA000, 0, 0x3F, 1),
	SOC_SINGLE("Capture Volume", UDA134X_EA010, 2, 0x07, 0),
	SOC_SINGLE("Analog1 Volume", UDA134X_EA000, 0, 0x1F, 1),
	SOC_SINGLE("Analog2 Volume", UDA134X_EA001, 0, 0x1F, 1),

	SOC_SINGLE("Mic Sensitivity", UDA134X_EA010, 2, 7, 0),
	SOC_SINGLE("Mic Volume", UDA134X_EA101, 0, 0x1F, 0),

	SOC_SINGLE("Tone Control - Bass", UDA134X_DATA001, 2, 0xF, 0),
	SOC_SINGLE("Tone Control - Treble", UDA134X_DATA001, 0, 3, 0),

	SOC_ENUM("Sound Processing Filter", uda134x_mixer_enum[0]),
	SOC_ENUM("PCM Playback De-emphasis", uda134x_mixer_enum[1]),
	SOC_ENUM("Input Mux", uda134x_mixer_enum[2]),

	SOC_SINGLE("AGC Switch", UDA134X_EA100, 4, 1, 0),
	SOC_SINGLE("AGC Target Volume", UDA134X_EA110, 0, 0x03, 1),
	SOC_SINGLE("AGC Timing", UDA134X_EA110, 2, 0x07, 0),

	SOC_SINGLE("DAC +6dB Switch", UDA134X_STATUS1, 6, 1, 0),
	SOC_SINGLE("ADC +6dB Switch", UDA134X_STATUS1, 5, 1, 0),
	SOC_SINGLE("ADC Polarity Switch", UDA134X_STATUS1, 4, 1, 0),
	SOC_SINGLE("DAC Polarity Switch", UDA134X_STATUS1, 3, 1, 0),
	SOC_SINGLE("Double Speed Playback Switch", UDA134X_STATUS1, 2, 1, 0),
	SOC_SINGLE("DC Filter Enable Switch", UDA134X_STATUS0, 0, 1, 0),
	};

	static const struct snd_kcontrol_new uda1340_snd_controls[] = {
	SOC_SINGLE("Master Playback Volume", UDA134X_DATA000, 0, 0x3F, 1),

	SOC_SINGLE("Tone Control - Bass", UDA134X_DATA001, 2, 0xF, 0),
	SOC_SINGLE("Tone Control - Treble", UDA134X_DATA001, 0, 3, 0),

	SOC_ENUM("Sound Processing Filter", uda134x_mixer_enum[0]),
	SOC_ENUM("PCM Playback De-emphasis", uda134x_mixer_enum[1]),

	SOC_SINGLE("DC Filter Enable Switch", UDA134X_STATUS0, 0, 1, 0),
	};

	static struct snd_soc_dai_ops uda134x_dai_ops = {
	.startup = uda134x_startup,
	.shutdown = uda134x_shutdown,
	.hw_params = uda134x_hw_params,
	.digital_mute = uda134x_mute,
	.set_sysclk = uda134x_set_dai_sysclk,
	.set_fmt = uda134x_set_dai_fmt,
	};

	struct snd_soc_dai uda134x_dai = {
	.name = "UDA134X",
	/* playback capabilities */
	.playback = {
	.stream_name = "Playback",
	.channels_min = 1,
	.channels_max = 2,
	.rates = UDA134X_RATES,
	.formats = UDA134X_FORMATS,
	},
	/* capture capabilities */
	.capture = {
	.stream_name = "Capture",
	.channels_min = 1,
	.channels_max = 2,
	.rates = UDA134X_RATES,
	.formats = UDA134X_FORMATS,
	},
	/* pcm operations */
	.ops = &uda134x_dai_ops,
	};
	EXPORT_SYMBOL(uda134x_dai);


	static int uda134x_soc_probe(struct platform_device *pdev)
	{
	struct snd_soc_device *socdev = platform_get_drvdata(pdev);
	struct snd_soc_codec *codec;
	struct uda134x_priv *uda134x;
	void *codec_setup_data = socdev->codec_data;
	int ret = -ENOMEM;
	struct uda134x_platform_data *pd;

	printk(KERN_INFO "UDA134X SoC Audio Codec\n");

	if (!codec_setup_data) {
	printk(KERN_ERR "UDA134X SoC codec: "
	"missing L3 bitbang function\n");
	return -ENODEV;
	}

	pd = codec_setup_data;
	switch (pd->model) {
	case UDA134X_UDA1340:
	case UDA134X_UDA1341:
	case UDA134X_UDA1344:
	break;
	default:
	printk(KERN_ERR "UDA134X SoC codec: "
	"unsupported model %d\n",
	pd->model);
	return -EINVAL;
	}

	socdev->card->codec = kzalloc(sizeof(struct snd_soc_codec), GFP_KERNEL);
	if (socdev->card->codec == NULL)
	return ret;

	codec = socdev->card->codec;

	uda134x = kzalloc(sizeof(struct uda134x_priv), GFP_KERNEL);
	if (uda134x == NULL)
	goto priv_err;
	codec->private_data = uda134x;

	codec->reg_cache = kmemdup(uda134x_reg, sizeof(uda134x_reg),
	GFP_KERNEL);
	if (codec->reg_cache == NULL)
	goto reg_err;

	mutex_init(&codec->mutex);

	codec->reg_cache_size = sizeof(uda134x_reg);
	codec->reg_cache_step = 1;

	codec->name = "UDA134X";
	codec->owner = THIS_MODULE;
	codec->dai = &uda134x_dai;
	codec->num_dai = 1;
	codec->read = uda134x_read_reg_cache;
	codec->write = uda134x_write;
	#ifdef POWER_OFF_ON_STANDBY
	codec->set_bias_level = uda134x_set_bias_level;
	#endif
	INIT_LIST_HEAD(&codec->dapm_widgets);
	INIT_LIST_HEAD(&codec->dapm_paths);

	codec->control_data = codec_setup_data;

	if (pd->power)
	pd->power(1);

	uda134x_reset(codec);

	/* register pcms */
	ret = snd_soc_new_pcms(socdev, SNDRV_DEFAULT_IDX1, SNDRV_DEFAULT_STR1);
	if (ret < 0) {
	printk(KERN_ERR "UDA134X: failed to register pcms\n");
	goto pcm_err;
	}

	switch (pd->model) {
	case UDA134X_UDA1340:
	case UDA134X_UDA1344:
	ret = snd_soc_add_controls(codec, uda1340_snd_controls,
	ARRAY_SIZE(uda1340_snd_controls));
	break;
	case UDA134X_UDA1341:
	ret = snd_soc_add_controls(codec, uda1341_snd_controls,
	ARRAY_SIZE(uda1341_snd_controls));
	break;
	default:
	printk(KERN_ERR "%s unknown codec type: %d",
	__func__, pd->model);
	return -EINVAL;
	}

	if (ret < 0) {
	printk(KERN_ERR "UDA134X: failed to register controls\n");
	goto pcm_err;
	}

	return 0;

	pcm_err:
	kfree(codec->reg_cache);
	reg_err:
	kfree(codec->private_data);
	priv_err:
	kfree(codec);
	return ret;
	}

	/* power down chip */
	static int uda134x_soc_remove(struct platform_device *pdev)
	{
	struct snd_soc_device *socdev = platform_get_drvdata(pdev);
	struct snd_soc_codec *codec = socdev->card->codec;

	uda134x_set_bias_level(codec, SND_SOC_BIAS_STANDBY);
	uda134x_set_bias_level(codec, SND_SOC_BIAS_OFF);

	snd_soc_free_pcms(socdev);
	snd_soc_dapm_free(socdev);

	kfree(codec->private_data);
	kfree(codec->reg_cache);
	kfree(codec);

	return 0;
	}

	#if defined(CONFIG_PM)
	static int uda134x_soc_suspend(struct platform_device *pdev,
	pm_message_t state)
	{
	struct snd_soc_device *socdev = platform_get_drvdata(pdev);
	struct snd_soc_codec *codec = socdev->card->codec;

	uda134x_set_bias_level(codec, SND_SOC_BIAS_STANDBY);
	uda134x_set_bias_level(codec, SND_SOC_BIAS_OFF);
	return 0;
	}

	static int uda134x_soc_resume(struct platform_device *pdev)
	{
	struct snd_soc_device *socdev = platform_get_drvdata(pdev);
	struct snd_soc_codec *codec = socdev->card->codec;

	uda134x_set_bias_level(codec, SND_SOC_BIAS_PREPARE);
	uda134x_set_bias_level(codec, SND_SOC_BIAS_ON);
	return 0;
	}
	#else
	#define uda134x_soc_suspend NULL
	#define uda134x_soc_resume NULL
	#endif /* CONFIG_PM */

	struct snd_soc_codec_device soc_codec_dev_uda134x = {
	.probe = uda134x_soc_probe,
	.remove = uda134x_soc_remove,
	.suspend = uda134x_soc_suspend,
	.resume = uda134x_soc_resume,
	};
	EXPORT_SYMBOL_GPL(soc_codec_dev_uda134x);

	static int __init uda134x_init(void)
	{
	return snd_soc_register_dai(&uda134x_dai);
	}
	module_init(uda134x_init);

	static void __exit uda134x_exit(void)
	{
	snd_soc_unregister_dai(&uda134x_dai);
	}
	module_exit(uda134x_exit);

	MODULE_DESCRIPTION("UDA134X ALSA soc codec driver");
	MODULE_AUTHOR("Zoltan Devai, Christian Pellegrin <chripell@evolware.org>");
	MODULE_LICENSE("GPL");