/*
* Texas Instruments TLV320AIC26 low power audio CODEC
* ALSA SoC CODEC driver
*
* Copyright (C) 2008 Secret Lab Technologies Ltd.
*/
#include <linux/module.h>
#include <linux/moduleparam.h>
#include <linux/init.h>
#include <linux/delay.h>
#include <linux/pm.h>
#include <linux/device.h>
#include <linux/sysfs.h>
#include <linux/spi/spi.h>
#include <linux/slab.h>
#include <sound/core.h>
#include <sound/pcm.h>
#include <sound/pcm_params.h>
#include <sound/soc.h>
#include <sound/initval.h>
#include "tlv320aic26.h"
MODULE_DESCRIPTION("ASoC TLV320AIC26 codec driver");
MODULE_AUTHOR("Grant Likely <grant.likely@secretlab.ca>");
MODULE_LICENSE("GPL");
/* AIC26 driver private data */
struct aic26 {
struct spi_device *spi;
struct snd_soc_codec codec;
int master;
int datfm;
int mclk;
/* Keyclick parameters */
int keyclick_amplitude;
int keyclick_freq;
int keyclick_len;
};
/* ---------------------------------------------------------------------
* Register access routines
*/
static unsigned int aic26_reg_read(struct snd_soc_codec *codec,
unsigned int reg)
{
struct aic26 *aic26 = snd_soc_codec_get_drvdata(codec);
u16 *cache = codec->reg_cache;
u16 cmd, value;
u8 buffer[2];
int rc;
if (reg >= AIC26_NUM_REGS) {
WARN_ON_ONCE(1);
return 0;
}
/* Do SPI transfer; first 16bits are command; remaining is
* register contents */
cmd = AIC26_READ_COMMAND_WORD(reg);
buffer[0] = (cmd >> 8) & 0xff;
buffer[1] = cmd & 0xff;
rc = spi_write_then_read(aic26->spi, buffer, 2, buffer, 2);
if (rc) {
dev_err(&aic26->spi->dev, "AIC26 reg read error\n");
return -EIO;
}
value = (buffer[0] << 8) | buffer[1];
/* Update the cache before returning with the value */
cache[reg] = value;
return value;
}
static unsigned int aic26_reg_read_cache(struct snd_soc_codec *codec,
unsigned int reg)
{
u16 *cache = codec->reg_cache;
if (reg >= AIC26_NUM_REGS) {
WARN_ON_ONCE(1);
return 0;
}
return cache[reg];
}
static int aic26_reg_write(struct snd_soc_codec *codec, unsigned int reg,
unsigned int value)
{
struct aic26 *aic26 = snd_soc_codec_get_drvdata(codec);
u16 *cache = codec->reg_cache;
u16 cmd;
u8 buffer[4];
int rc;
if (reg >= AIC26_NUM_REGS) {
WARN_ON_ONCE(1);
return -EINVAL;
}
/* Do SPI transfer; first 16bits are command; remaining is data
* to write into register */
cmd = AIC26_WRITE_COMMAND_WORD(reg);
buffer[0] = (cmd >> 8) & 0xff;
buffer[1] = cmd & 0xff;
buffer[2] = value >> 8;
buffer[3] = value;
rc = spi_write(aic26->spi, buffer, 4);
if (rc) {
dev_err(&aic26->spi->dev, "AIC26 reg read error\n");
return -EIO;
}
/* update cache before returning */
cache[reg] = value;
return 0;
}
/* ---------------------------------------------------------------------
* Digital Audio Interface Operations
*/
static int aic26_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_codec *codec = rtd->codec;
struct aic26 *aic26 = snd_soc_codec_get_drvdata(codec);
int fsref, divisor, wlen, pval, jval, dval, qval;
u16 reg;
dev_dbg(&aic26->spi->dev, "aic26_hw_params(substream=%p, params=%p)\n",
substream, params);
dev_dbg(&aic26->spi->dev, "rate=%i format=%i\n", params_rate(params),
params_format(params));
switch (params_rate(params)) {
case 8000: fsref = 48000; divisor = AIC26_DIV_6; break;
case 11025: fsref = 44100; divisor = AIC26_DIV_4; break;
case 12000: fsref = 48000; divisor = AIC26_DIV_4; break;
case 16000: fsref = 48000; divisor = AIC26_DIV_3; break;
case 22050: fsref = 44100; divisor = AIC26_DIV_2; break;
case 24000: fsref = 48000; divisor = AIC26_DIV_2; break;
case 32000: fsref = 48000; divisor = AIC26_DIV_1_5; break;
case 44100: fsref = 44100; divisor = AIC26_DIV_1; break;
case 48000: fsref = 48000; divisor = AIC26_DIV_1; break;
default:
dev_dbg(&aic26->spi->dev, "bad rate\n"); return -EINVAL;
}
/* select data word length */
switch (params_format(params)) {
case SNDRV_PCM_FORMAT_S8: wlen = AIC26_WLEN_16; break;
case SNDRV_PCM_FORMAT_S16_BE: wlen = AIC26_WLEN_16; break;
case SNDRV_PCM_FORMAT_S24_BE: wlen = AIC26_WLEN_24; break;
case SNDRV_PCM_FORMAT_S32_BE: wlen = AIC26_WLEN_32; break;
default:
dev_dbg(&aic26->spi->dev, "bad format\n"); return -EINVAL;
}
/**
* Configure PLL
* fsref = (mclk * PLLM) / 2048
* where PLLM = J.DDDD (DDDD register ranges from 0 to 9999, decimal)
*/
pval = 1;
/* compute J portion of multiplier */
jval = fsref / (aic26->mclk / 2048);
/* compute fractional DDDD component of multiplier */
dval = fsref - (jval * (aic26->mclk / 2048));
dval = (10000 * dval) / (aic26->mclk / 2048);
dev_dbg(&aic26->spi->dev, "Setting PLLM to %d.%04d\n", jval, dval);
qval = 0;
reg = 0x8000 | qval << 11 | pval << 8 | jval << 2;
aic26_reg_write(codec, AIC26_REG_PLL_PROG1, reg);
reg = dval << 2;
aic26_reg_write(codec, AIC26_REG_PLL_PROG2, reg);
/* Audio Control 3 (master mode, fsref rate) */
reg = aic26_reg_read_cache(codec, AIC26_REG_AUDIO_CTRL3);
reg &= ~0xf800;
if (aic26->master)
reg |= 0x0800;
if (fsref == 48000)
reg |= 0x2000;
aic26_reg_write(codec, AIC26_REG_AUDIO_CTRL3, reg);
/* Audio Control 1 (FSref divisor) */
reg = aic26_reg_read_cache(codec, AIC26_REG_AUDIO_CTRL1);
reg &= ~0x0fff;
reg |= wlen | aic26->datfm | (divisor << 3) | divisor;
aic26_reg_write(codec, AIC26_REG_AUDIO_CTRL1, reg);
return 0;
}
/**
* aic26_mute - Mute control to reduce noise when changing audio format
*/
static int aic26_mute(struct snd_soc_dai *dai, int mute)
{
struct snd_soc_codec *codec = dai->codec;
struct aic26 *aic26 = snd_soc_codec_get_drvdata(codec);
u16 reg = aic26_reg_read_cache(codec, AIC26_REG_DAC_GAIN);
dev_dbg(&aic26->spi->dev, "aic26_mute(dai=%p, mute=%i)\n",
dai, mute);
if (mute)
reg |= 0x8080;
else
reg &= ~0x8080;
aic26_reg_write(codec, AIC26_REG_DAC_GAIN, reg);
return 0;
}
static int aic26_set_sysclk(struct snd_soc_dai *codec_dai,
int clk_id, unsigned int freq, int dir)
{
struct snd_soc_codec *codec = codec_dai->codec;
struct aic26 *aic26 = snd_soc_codec_get_drvdata(codec);
dev_dbg(&aic26->spi->dev, "aic26_set_sysclk(dai=%p, clk_id==%i,"
" freq=%i, dir=%i)\n",
codec_dai, clk_id, freq, dir);
/* MCLK needs to fall between 2MHz and 50 MHz */
if ((freq < 2000000) || (freq > 50000000))
return -EINVAL;
aic26->mclk = freq;
return 0;
}
static int aic26_set_fmt(struct snd_soc_dai *codec_dai, unsigned int fmt)
{
struct snd_soc_codec *codec = codec_dai->codec;
struct aic26 *aic26 = snd_soc_codec_get_drvdata(codec);
dev_dbg(&aic26->spi->dev, "aic26_set_fmt(dai=%p, fmt==%i)\n",
codec_dai, fmt);
/* set master/slave audio interface */
switch (fmt & SND_SOC_DAIFMT_MASTER_MASK) {
case SND_SOC_DAIFMT_CBM_CFM: aic26->master = 1; break;
case SND_SOC_DAIFMT_CBS_CFS: aic26->master = 0; break;
default:
dev_dbg(&aic26->spi->dev, "bad master\n"); return -EINVAL;
}
/* interface format */
switch (fmt & SND_SOC_DAIFMT_FORMAT_MASK) {
case SND_SOC_DAIFMT_I2S: aic26->datfm = AIC26_DATFM_I2S; break;
case SND_SOC_DAIFMT_DSP_A: aic26->datfm = AIC26_DATFM_DSP; break;
case SND_SOC_DAIFMT_RIGHT_J: aic26->datfm = AIC26_DATFM_RIGHTJ; break;
case SND_SOC_DAIFMT_LEFT_J: aic26->datfm = AIC26_DATFM_LEFTJ; break;
default:
dev_dbg(&aic26->spi->dev, "bad format\n"); return -EINVAL;
}
return 0;
}
/* ---------------------------------------------------------------------
* Digital Audio Interface Definition
*/
#define AIC26_RATES (SNDRV_PCM_RATE_8000 | SNDRV_PCM_RATE_11025 |\
SNDRV_PCM_RATE_16000 | SNDRV_PCM_RATE_22050 |\
SNDRV_PCM_RATE_32000 | SNDRV_PCM_RATE_44100 |\
SNDRV_PCM_RATE_48000)
#define AIC26_FORMATS (SNDRV_PCM_FMTBIT_S8 | SNDRV_PCM_FMTBIT_S16_BE |\
SNDRV_PCM_FMTBIT_S24_BE | SNDRV_PCM_FMTBIT_S32_BE)
static struct snd_soc_dai_ops aic26_dai_ops = {
.hw_params = aic26_hw_params,
.digital_mute = aic26_mute,
.set_sysclk = aic26_set_sysclk,
.set_fmt = aic26_set_fmt,
};
static struct snd_soc_dai_driver aic26_dai = {
.name = "tlv320aic26-hifi",
.playback = {
.stream_name = "Playback",
.channels_min = 2,
.channels_max = 2,
.rates = AIC26_RATES,
.formats = AIC26_FORMATS,
},
.capture = {
.stream_name = "Capture",
.channels_min = 2,
.channels_max = 2,
.rates = AIC26_RATES,
.formats = AIC26_FORMATS,
},
.ops = &aic26_dai_ops,
};
/* ---------------------------------------------------------------------
* ALSA controls
*/
static const char *aic26_capture_src_text[] = {"Mic", "Aux"};
static const struct soc_enum aic26_capture_src_enum =
SOC_ENUM_SINGLE(AIC26_REG_AUDIO_CTRL1, 12, 2, aic26_capture_src_text);
static const struct snd_kcontrol_new aic26_snd_controls[] = {
/* Output */
SOC_DOUBLE("PCM Playback Volume", AIC26_REG_DAC_GAIN, 8, 0, 0x7f, 1),
SOC_DOUBLE("PCM Playback Switch", AIC26_REG_DAC_GAIN, 15, 7, 1, 1),
SOC_SINGLE("PCM Capture Volume", AIC26_REG_ADC_GAIN, 8, 0x7f, 0),
SOC_SINGLE("PCM Capture Mute", AIC26_REG_ADC_GAIN, 15, 1, 1),
SOC_SINGLE("Keyclick activate", AIC26_REG_AUDIO_CTRL2, 15, 0x1, 0),
SOC_SINGLE("Keyclick amplitude", AIC26_REG_AUDIO_CTRL2, 12, 0x7, 0),
SOC_SINGLE("Keyclick frequency", AIC26_REG_AUDIO_CTRL2, 8, 0x7, 0),
SOC_SINGLE("Keyclick period", AIC26_REG_AUDIO_CTRL2, 4, 0xf, 0),
SOC_ENUM("Capture Source", aic26_capture_src_enum),
};
/* ---------------------------------------------------------------------
* SPI device portion of driver: sysfs files for debugging
*/
static ssize_t aic26_keyclick_show(struct device *dev,
struct device_attribute *attr, char *buf)
{
struct aic26 *aic26 = dev_get_drvdata(dev);
int val, amp, freq, len;
val = aic26_reg_read_cache(&aic26->codec, AIC26_REG_AUDIO_CTRL2);
amp = (val >> 12) & 0x7;
freq = (125 << ((val >> 8) & 0x7)) >> 1;
len = 2 * (1 + ((val >> 4) & 0xf));
return sprintf(buf, "amp=%x freq=%iHz len=%iclks\n", amp, freq, len);
}
/* Any write to the keyclick attribute will trigger the keyclick event */
static ssize_t aic26_keyclick_set(struct device *dev,
struct device_attribute *attr,
const char *buf, size_t count)
{
struct aic26 *aic26 = dev_get_drvdata(dev);
int val;
val = aic26_reg_read_cache(&aic26->codec, AIC26_REG_AUDIO_CTRL2);
val |= 0x8000;
aic26_reg_write(&aic26->codec, AIC26_REG_AUDIO_CTRL2, val);
return count;
}
static DEVICE_ATTR(keyclick, 0644, aic26_keyclick_show, aic26_keyclick_set);
/* ---------------------------------------------------------------------
* SoC CODEC portion of driver: probe and release routines
*/
static int aic26_probe(struct snd_soc_codec *codec)
{
int ret, err, i, reg;
dev_info(codec->dev, "Probing AIC26 SoC CODEC driver\n");
/* Reset the codec to power on defaults */
aic26_reg_write(codec, AIC26_REG_RESET, 0xBB00);
/* Power up CODEC */
aic26_reg_write(codec, AIC26_REG_POWER_CTRL, 0);
/* Audio Control 3 (master mode, fsref rate) */
reg = aic26_reg_read(codec, AIC26_REG_AUDIO_CTRL3);
reg &= ~0xf800;
reg |= 0x0800; /* set master mode */
aic26_reg_write(codec, AIC26_REG_AUDIO_CTRL3, reg);
/* Fill register cache */
for (i = 0; i < codec->driver->reg_cache_size; i++)
aic26_reg_read(codec, i);
/* Register the sysfs files for debugging */
/* Create SysFS files */
ret = device_create_file(codec->dev, &dev_attr_keyclick);
if (ret)
dev_info(codec->dev, "error creating sysfs files\n");
/* register controls */
dev_dbg(codec->dev, "Registering controls\n");
err = snd_soc_add_controls(codec, aic26_snd_controls,
ARRAY_SIZE(aic26_snd_controls));
WARN_ON(err < 0);
return 0;
}
static struct snd_soc_codec_driver aic26_soc_codec_dev = {
.probe = aic26_probe,
.read = aic26_reg_read,
.write = aic26_reg_write,
.reg_cache_size = AIC26_NUM_REGS,
.reg_word_size = sizeof(u16),
};
/* ---------------------------------------------------------------------
* SPI device portion of driver: probe and release routines and SPI
* driver registration.
*/
static int aic26_spi_probe(struct spi_device *spi)
{
struct aic26 *aic26;
int ret;
dev_dbg(&spi->dev, "probing tlv320aic26 spi device\n");
/* Allocate driver data */
aic26 = kzalloc(sizeof *aic26, GFP_KERNEL);
if (!aic26)
return -ENOMEM;
/* Initialize the driver data */
aic26->spi = spi;
dev_set_drvdata(&spi->dev, aic26);
aic26->master = 1;
ret = snd_soc_register_codec(&spi->dev,
&aic26_soc_codec_dev, &aic26_dai, 1);
if (ret < 0)
kfree(aic26);
return ret;
dev_dbg(&spi->dev, "SPI device initialized\n");
return 0;
}
static int aic26_spi_remove(struct spi_device *spi)
{
snd_soc_unregister_codec(&spi->dev);
kfree(spi_get_drvdata(spi));
return 0;
}
static struct spi_driver aic26_spi = {
.driver = {
.name = "tlv320aic26-codec",
.owner = THIS_MODULE,
},
.probe = aic26_spi_probe,
.remove = aic26_spi_remove,
};
static int __init aic26_init(void)
{
return spi_register_driver(&aic26_spi);
}
module_init(aic26_init);
static void __exit aic26_exit(void)
{
spi_unregister_driver(&aic26_spi);
}
module_exit(aic26_exit);
