/*
* File: sound/soc/codecs/ad1836.c
* Author: Barry Song <Barry.Song@analog.com>
*
* Created: Aug 04 2009
* Description: Driver for AD1836 sound chip
*
* Modified:
* Copyright 2009 Analog Devices Inc.
*
* Bugs: Enter bugs at http://blackfin.uclinux.org/
*
* 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.
*/
#include <linux/init.h>
#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/device.h>
#include <sound/core.h>
#include <sound/pcm.h>
#include <sound/pcm_params.h>
#include <sound/initval.h>
#include <sound/soc.h>
#include <sound/tlv.h>
#include <sound/soc-dapm.h>
#include <linux/spi/spi.h>
#include "ad1836.h"
/* codec private data */
struct ad1836_priv {
struct snd_soc_codec codec;
u16 reg_cache[AD1836_NUM_REGS];
};
static struct snd_soc_codec *ad1836_codec;
struct snd_soc_codec_device soc_codec_dev_ad1836;
static int ad1836_register(struct ad1836_priv *ad1836);
static void ad1836_unregister(struct ad1836_priv *ad1836);
/*
* AD1836 volume/mute/de-emphasis etc. controls
*/
static const char *ad1836_deemp[] = {"None", "44.1kHz", "32kHz", "48kHz"};
static const struct soc_enum ad1836_deemp_enum =
SOC_ENUM_SINGLE(AD1836_DAC_CTRL1, 8, 4, ad1836_deemp);
static const struct snd_kcontrol_new ad1836_snd_controls[] = {
/* DAC volume control */
SOC_DOUBLE_R("DAC1 Volume", AD1836_DAC_L1_VOL,
AD1836_DAC_R1_VOL, 0, 0x3FF, 0),
SOC_DOUBLE_R("DAC2 Volume", AD1836_DAC_L2_VOL,
AD1836_DAC_R2_VOL, 0, 0x3FF, 0),
SOC_DOUBLE_R("DAC3 Volume", AD1836_DAC_L3_VOL,
AD1836_DAC_R3_VOL, 0, 0x3FF, 0),
/* ADC switch control */
SOC_DOUBLE("ADC1 Switch", AD1836_ADC_CTRL2, AD1836_ADCL1_MUTE,
AD1836_ADCR1_MUTE, 1, 1),
SOC_DOUBLE("ADC2 Switch", AD1836_ADC_CTRL2, AD1836_ADCL2_MUTE,
AD1836_ADCR2_MUTE, 1, 1),
/* DAC switch control */
SOC_DOUBLE("DAC1 Switch", AD1836_DAC_CTRL2, AD1836_DACL1_MUTE,
AD1836_DACR1_MUTE, 1, 1),
SOC_DOUBLE("DAC2 Switch", AD1836_DAC_CTRL2, AD1836_DACL2_MUTE,
AD1836_DACR2_MUTE, 1, 1),
SOC_DOUBLE("DAC3 Switch", AD1836_DAC_CTRL2, AD1836_DACL3_MUTE,
AD1836_DACR3_MUTE, 1, 1),
/* ADC high-pass filter */
SOC_SINGLE("ADC High Pass Filter Switch", AD1836_ADC_CTRL1,
AD1836_ADC_HIGHPASS_FILTER, 1, 0),
/* DAC de-emphasis */
SOC_ENUM("Playback Deemphasis", ad1836_deemp_enum),
};
static const struct snd_soc_dapm_widget ad1836_dapm_widgets[] = {
SND_SOC_DAPM_DAC("DAC", "Playback", AD1836_DAC_CTRL1,
AD1836_DAC_POWERDOWN, 1),
SND_SOC_DAPM_ADC("ADC", "Capture", SND_SOC_NOPM, 0, 0),
SND_SOC_DAPM_SUPPLY("ADC_PWR", AD1836_ADC_CTRL1,
AD1836_ADC_POWERDOWN, 1, NULL, 0),
SND_SOC_DAPM_OUTPUT("DAC1OUT"),
SND_SOC_DAPM_OUTPUT("DAC2OUT"),
SND_SOC_DAPM_OUTPUT("DAC3OUT"),
SND_SOC_DAPM_INPUT("ADC1IN"),
SND_SOC_DAPM_INPUT("ADC2IN"),
};
static const struct snd_soc_dapm_route audio_paths[] = {
{ "DAC", NULL, "ADC_PWR" },
{ "ADC", NULL, "ADC_PWR" },
{ "DAC1OUT", "DAC1 Switch", "DAC" },
{ "DAC2OUT", "DAC2 Switch", "DAC" },
{ "DAC3OUT", "DAC3 Switch", "DAC" },
{ "ADC", "ADC1 Switch", "ADC1IN" },
{ "ADC", "ADC2 Switch", "ADC2IN" },
};
/*
* DAI ops entries
*/
static int ad1836_set_dai_fmt(struct snd_soc_dai *codec_dai,
unsigned int fmt)
{
switch (fmt & SND_SOC_DAIFMT_FORMAT_MASK) {
/* at present, we support adc aux mode to interface with
* blackfin sport tdm mode
*/
case SND_SOC_DAIFMT_DSP_A:
break;
default:
return -EINVAL;
}
switch (fmt & SND_SOC_DAIFMT_INV_MASK) {
case SND_SOC_DAIFMT_IB_IF:
break;
default:
return -EINVAL;
}
switch (fmt & SND_SOC_DAIFMT_MASTER_MASK) {
/* ALCLK,ABCLK are both output, AD1836 can only be master */
case SND_SOC_DAIFMT_CBM_CFM:
break;
default:
return -EINVAL;
}
return 0;
}
static int ad1836_hw_params(struct snd_pcm_substream *substream,
struct snd_pcm_hw_params *params,
struct snd_soc_dai *dai)
{
int word_len = 0;
struct snd_soc_pcm_runtime *rtd = substream->private_data;
struct snd_soc_device *socdev = rtd->socdev;
struct snd_soc_codec *codec = socdev->card->codec;
/* bit size */
switch (params_format(params)) {
case SNDRV_PCM_FORMAT_S16_LE:
word_len = 3;
break;
case SNDRV_PCM_FORMAT_S20_3LE:
word_len = 1;
break;
case SNDRV_PCM_FORMAT_S24_LE:
case SNDRV_PCM_FORMAT_S32_LE:
word_len = 0;
break;
}
snd_soc_update_bits(codec, AD1836_DAC_CTRL1,
AD1836_DAC_WORD_LEN_MASK, word_len);
snd_soc_update_bits(codec, AD1836_ADC_CTRL2,
AD1836_ADC_WORD_LEN_MASK, word_len);
return 0;
}
/*
* interface to read/write ad1836 register
*/
#define AD1836_SPI_REG_SHFT 12
#define AD1836_SPI_READ (1 << 11)
#define AD1836_SPI_VAL_MSK 0x3FF
/*
* write to the ad1836 register space
*/
static int ad1836_write_reg(struct snd_soc_codec *codec, unsigned int reg,
unsigned int value)
{
u16 *reg_cache = codec->reg_cache;
int ret = 0;
if (value != reg_cache[reg]) {
unsigned short buf;
struct spi_transfer t = {
.tx_buf = &buf,
.len = 2,
};
struct spi_message m;
buf = (reg << AD1836_SPI_REG_SHFT) |
(value & AD1836_SPI_VAL_MSK);
spi_message_init(&m);
spi_message_add_tail(&t, &m);
ret = spi_sync(codec->control_data, &m);
if (ret == 0)
reg_cache[reg] = value;
}
return ret;
}
/*
* read from the ad1836 register space cache
*/
static unsigned int ad1836_read_reg_cache(struct snd_soc_codec *codec,
unsigned int reg)
{
u16 *reg_cache = codec->reg_cache;
if (reg >= codec->reg_cache_size)
return -EINVAL;
return reg_cache[reg];
}
static int __devinit ad1836_spi_probe(struct spi_device *spi)
{
struct snd_soc_codec *codec;
struct ad1836_priv *ad1836;
ad1836 = kzalloc(sizeof(struct ad1836_priv), GFP_KERNEL);
if (ad1836 == NULL)
return -ENOMEM;
codec = &ad1836->codec;
codec->control_data = spi;
codec->dev = &spi->dev;
dev_set_drvdata(&spi->dev, ad1836);
return ad1836_register(ad1836);
}
static int __devexit ad1836_spi_remove(struct spi_device *spi)
{
struct ad1836_priv *ad1836 = dev_get_drvdata(&spi->dev);
ad1836_unregister(ad1836);
return 0;
}
static struct spi_driver ad1836_spi_driver = {
.driver = {
.name = "ad1836",
.owner = THIS_MODULE,
},
.probe = ad1836_spi_probe,
.remove = __devexit_p(ad1836_spi_remove),
};
static struct snd_soc_dai_ops ad1836_dai_ops = {
.hw_params = ad1836_hw_params,
.set_fmt = ad1836_set_dai_fmt,
};
/* codec DAI instance */
struct snd_soc_dai ad1836_dai = {
.name = "AD1836",
.playback = {
.stream_name = "Playback",
.channels_min = 2,
.channels_max = 6,
.rates = SNDRV_PCM_RATE_48000,
.formats = SNDRV_PCM_FMTBIT_S32_LE | SNDRV_PCM_FMTBIT_S16_LE |
SNDRV_PCM_FMTBIT_S20_3LE | SNDRV_PCM_FMTBIT_S24_LE,
},
.capture = {
.stream_name = "Capture",
.channels_min = 2,
.channels_max = 4,
.rates = SNDRV_PCM_RATE_48000,
.formats = SNDRV_PCM_FMTBIT_S32_LE | SNDRV_PCM_FMTBIT_S16_LE |
SNDRV_PCM_FMTBIT_S20_3LE | SNDRV_PCM_FMTBIT_S24_LE,
},
.ops = &ad1836_dai_ops,
};
EXPORT_SYMBOL_GPL(ad1836_dai);
static int ad1836_register(struct ad1836_priv *ad1836)
{
int ret;
struct snd_soc_codec *codec = &ad1836->codec;
if (ad1836_codec) {
dev_err(codec->dev, "Another ad1836 is registered\n");
return -EINVAL;
}
mutex_init(&codec->mutex);
INIT_LIST_HEAD(&codec->dapm_widgets);
INIT_LIST_HEAD(&codec->dapm_paths);
codec->private_data = ad1836;
codec->reg_cache = ad1836->reg_cache;
codec->reg_cache_size = AD1836_NUM_REGS;
codec->name = "AD1836";
codec->owner = THIS_MODULE;
codec->dai = &ad1836_dai;
codec->num_dai = 1;
codec->write = ad1836_write_reg;
codec->read = ad1836_read_reg_cache;
INIT_LIST_HEAD(&codec->dapm_widgets);
INIT_LIST_HEAD(&codec->dapm_paths);
ad1836_dai.dev = codec->dev;
ad1836_codec = codec;
/* default setting for ad1836 */
/* de-emphasis: 48kHz, power-on dac */
codec->write(codec, AD1836_DAC_CTRL1, 0x300);
/* unmute dac channels */
codec->write(codec, AD1836_DAC_CTRL2, 0x0);
/* high-pass filter enable, power-on adc */
codec->write(codec, AD1836_ADC_CTRL1, 0x100);
/* unmute adc channles, adc aux mode */
codec->write(codec, AD1836_ADC_CTRL2, 0x180);
/* left/right diff:PGA/MUX */
codec->write(codec, AD1836_ADC_CTRL3, 0x3A);
/* volume */
codec->write(codec, AD1836_DAC_L1_VOL, 0x3FF);
codec->write(codec, AD1836_DAC_R1_VOL, 0x3FF);
codec->write(codec, AD1836_DAC_L2_VOL, 0x3FF);
codec->write(codec, AD1836_DAC_R2_VOL, 0x3FF);
codec->write(codec, AD1836_DAC_L3_VOL, 0x3FF);
codec->write(codec, AD1836_DAC_R3_VOL, 0x3FF);
ret = snd_soc_register_codec(codec);
if (ret != 0) {
dev_err(codec->dev, "Failed to register codec: %d\n", ret);
kfree(ad1836);
return ret;
}
ret = snd_soc_register_dai(&ad1836_dai);
if (ret != 0) {
dev_err(codec->dev, "Failed to register DAI: %d\n", ret);
snd_soc_unregister_codec(codec);
kfree(ad1836);
return ret;
}
return 0;
}
static void ad1836_unregister(struct ad1836_priv *ad1836)
{
snd_soc_unregister_dai(&ad1836_dai);
snd_soc_unregister_codec(&ad1836->codec);
kfree(ad1836);
ad1836_codec = NULL;
}
static int ad1836_probe(struct platform_device *pdev)
{
struct snd_soc_device *socdev = platform_get_drvdata(pdev);
struct snd_soc_codec *codec;
int ret = 0;
if (ad1836_codec == NULL) {
dev_err(&pdev->dev, "Codec device not registered\n");
return -ENODEV;
}
socdev->card->codec = ad1836_codec;
codec = ad1836_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, ad1836_snd_controls,
ARRAY_SIZE(ad1836_snd_controls));
snd_soc_dapm_new_controls(codec, ad1836_dapm_widgets,
ARRAY_SIZE(ad1836_dapm_widgets));
snd_soc_dapm_add_routes(codec, audio_paths, ARRAY_SIZE(audio_paths));
pcm_err:
return ret;
}
/* power down chip */
static int ad1836_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_ad1836 = {
.probe = ad1836_probe,
.remove = ad1836_remove,
};
EXPORT_SYMBOL_GPL(soc_codec_dev_ad1836);
static int __init ad1836_init(void)
{
int ret;
ret = spi_register_driver(&ad1836_spi_driver);
if (ret != 0) {
printk(KERN_ERR "Failed to register ad1836 SPI driver: %d\n",
ret);
}
return ret;
}
module_init(ad1836_init);
static void __exit ad1836_exit(void)
{
spi_unregister_driver(&ad1836_spi_driver);
}
module_exit(ad1836_exit);
MODULE_DESCRIPTION("ASoC ad1836 driver");
MODULE_AUTHOR("Barry Song <21cnbao@gmail.com>");
MODULE_LICENSE("GPL");
