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alistair23-linux/sound/soc/codecs/ak4104.c
Mark Brown a5db4d50fa ASoC: ak4104: Manage TXE using DAPM 
Saves some code. We should also be able to manage the power up and reset
registers using DAPM but it's probably more trouble than it's worth in
mains powered systems.

Signed-off-by: Mark Brown <broonie@linaro.org>
2013-08-12 11:22:39 +01:00

310 lines
7.4 KiB
C
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/*
* AK4104 ALSA SoC (ASoC) driver
*
* Copyright (c) 2009 Daniel Mack <daniel@caiaq.de>
*
* 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/module.h>
#include <linux/slab.h>
#include <sound/core.h>
#include <sound/soc.h>
#include <sound/initval.h>
#include <linux/spi/spi.h>
#include <linux/of_device.h>
#include <linux/of_gpio.h>
#include <sound/asoundef.h>
/* AK4104 registers addresses */
#define AK4104_REG_CONTROL1 0x00
#define AK4104_REG_RESERVED 0x01
#define AK4104_REG_CONTROL2 0x02
#define AK4104_REG_TX 0x03
#define AK4104_REG_CHN_STATUS(x) ((x) + 0x04)
#define AK4104_NUM_REGS 10
#define AK4104_REG_MASK 0x1f
#define AK4104_READ 0xc0
#define AK4104_WRITE 0xe0
#define AK4104_RESERVED_VAL 0x5b
/* Bit masks for AK4104 registers */
#define AK4104_CONTROL1_RSTN (1 << 0)
#define AK4104_CONTROL1_PW (1 << 1)
#define AK4104_CONTROL1_DIF0 (1 << 2)
#define AK4104_CONTROL1_DIF1 (1 << 3)
#define AK4104_CONTROL2_SEL0 (1 << 0)
#define AK4104_CONTROL2_SEL1 (1 << 1)
#define AK4104_CONTROL2_MODE (1 << 2)
#define AK4104_TX_TXE (1 << 0)
#define AK4104_TX_V (1 << 1)
#define DRV_NAME "ak4104-codec"
struct ak4104_private {
struct regmap *regmap;
};
static const struct snd_soc_dapm_widget ak4104_dapm_widgets[] = {
SND_SOC_DAPM_PGA("TXE", AK4104_REG_TX, AK4104_TX_TXE, 0, NULL, 0),
SND_SOC_DAPM_OUTPUT("TX"),
};
static const struct snd_soc_dapm_route ak4104_dapm_routes[] = {
{ "TXE", NULL, "Playback" },
{ "TX", NULL, "TXE" },
};
static int ak4104_set_dai_fmt(struct snd_soc_dai *codec_dai,
unsigned int format)
{
struct snd_soc_codec *codec = codec_dai->codec;
struct ak4104_private *ak4104 = snd_soc_codec_get_drvdata(codec);
int val = 0;
int ret;
/* set DAI format */
switch (format & SND_SOC_DAIFMT_FORMAT_MASK) {
case SND_SOC_DAIFMT_RIGHT_J:
break;
case SND_SOC_DAIFMT_LEFT_J:
val |= AK4104_CONTROL1_DIF0;
break;
case SND_SOC_DAIFMT_I2S:
val |= AK4104_CONTROL1_DIF0 | AK4104_CONTROL1_DIF1;
break;
default:
dev_err(codec->dev, "invalid dai format\n");
return -EINVAL;
}
/* This device can only be slave */
if ((format & SND_SOC_DAIFMT_MASTER_MASK) != SND_SOC_DAIFMT_CBS_CFS)
return -EINVAL;
ret = regmap_update_bits(ak4104->regmap, AK4104_REG_CONTROL1,
AK4104_CONTROL1_DIF0 | AK4104_CONTROL1_DIF1,
val);
if (ret < 0)
return ret;
return 0;
}
static int ak4104_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 ak4104_private *ak4104 = snd_soc_codec_get_drvdata(codec);
int ret, val = 0;
/* set the IEC958 bits: consumer mode, no copyright bit */
val |= IEC958_AES0_CON_NOT_COPYRIGHT;
regmap_write(ak4104->regmap, AK4104_REG_CHN_STATUS(0), val);
val = 0;
switch (params_rate(params)) {
case 22050:
val |= IEC958_AES3_CON_FS_22050;
break;
case 24000:
val |= IEC958_AES3_CON_FS_24000;
break;
case 32000:
val |= IEC958_AES3_CON_FS_32000;
break;
case 44100:
val |= IEC958_AES3_CON_FS_44100;
break;
case 48000:
val |= IEC958_AES3_CON_FS_48000;
break;
case 88200:
val |= IEC958_AES3_CON_FS_88200;
break;
case 96000:
val |= IEC958_AES3_CON_FS_96000;
break;
case 176400:
val |= IEC958_AES3_CON_FS_176400;
break;
case 192000:
val |= IEC958_AES3_CON_FS_192000;
break;
default:
dev_err(codec->dev, "unsupported sampling rate\n");
return -EINVAL;
}
ret = regmap_write(ak4104->regmap, AK4104_REG_CHN_STATUS(3), val);
if (ret < 0)
return ret;
return 0;
}
static const struct snd_soc_dai_ops ak4101_dai_ops = {
.hw_params = ak4104_hw_params,
.set_fmt = ak4104_set_dai_fmt,
};
static struct snd_soc_dai_driver ak4104_dai = {
.name = "ak4104-hifi",
.playback = {
.stream_name = "Playback",
.channels_min = 2,
.channels_max = 2,
.rates = SNDRV_PCM_RATE_8000_192000,
.formats = SNDRV_PCM_FMTBIT_S16_LE |
SNDRV_PCM_FMTBIT_S24_3LE |
SNDRV_PCM_FMTBIT_S24_LE
},
.ops = &ak4101_dai_ops,
};
static int ak4104_probe(struct snd_soc_codec *codec)
{
struct ak4104_private *ak4104 = snd_soc_codec_get_drvdata(codec);
int ret;
codec->control_data = ak4104->regmap;
/* set power-up and non-reset bits */
ret = regmap_update_bits(ak4104->regmap, AK4104_REG_CONTROL1,
AK4104_CONTROL1_PW | AK4104_CONTROL1_RSTN,
AK4104_CONTROL1_PW | AK4104_CONTROL1_RSTN);
if (ret < 0)
return ret;
/* enable transmitter */
ret = regmap_update_bits(ak4104->regmap, AK4104_REG_TX,
AK4104_TX_TXE, AK4104_TX_TXE);
if (ret < 0)
return ret;
return 0;
}
static int ak4104_remove(struct snd_soc_codec *codec)
{
struct ak4104_private *ak4104 = snd_soc_codec_get_drvdata(codec);
regmap_update_bits(ak4104->regmap, AK4104_REG_CONTROL1,
AK4104_CONTROL1_PW | AK4104_CONTROL1_RSTN, 0);
return 0;
}
static struct snd_soc_codec_driver soc_codec_device_ak4104 = {
.probe = ak4104_probe,
.remove = ak4104_remove,
.dapm_widgets = ak4104_dapm_widgets,
.num_dapm_widgets = ARRAY_SIZE(ak4104_dapm_widgets),
.dapm_routes = ak4104_dapm_routes,
.num_dapm_routes = ARRAY_SIZE(ak4104_dapm_routes),
};
static const struct regmap_config ak4104_regmap = {
.reg_bits = 8,
.val_bits = 8,
.max_register = AK4104_NUM_REGS - 1,
.read_flag_mask = AK4104_READ,
.write_flag_mask = AK4104_WRITE,
.cache_type = REGCACHE_RBTREE,
};
static int ak4104_spi_probe(struct spi_device *spi)
{
struct device_node *np = spi->dev.of_node;
struct ak4104_private *ak4104;
unsigned int val;
int ret;
spi->bits_per_word = 8;
spi->mode = SPI_MODE_0;
ret = spi_setup(spi);
if (ret < 0)
return ret;
ak4104 = devm_kzalloc(&spi->dev, sizeof(struct ak4104_private),
GFP_KERNEL);
if (ak4104 == NULL)
return -ENOMEM;
ak4104->regmap = devm_regmap_init_spi(spi, &ak4104_regmap);
if (IS_ERR(ak4104->regmap)) {
ret = PTR_ERR(ak4104->regmap);
return ret;
}
if (np) {
enum of_gpio_flags flags;
int gpio = of_get_named_gpio_flags(np, "reset-gpio", 0, &flags);
if (gpio_is_valid(gpio)) {
ret = devm_gpio_request_one(&spi->dev, gpio,
flags & OF_GPIO_ACTIVE_LOW ?
GPIOF_OUT_INIT_LOW : GPIOF_OUT_INIT_HIGH,
"ak4104 reset");
if (ret < 0)
return ret;
}
}
/* read the 'reserved' register - according to the datasheet, it
* should contain 0x5b. Not a good way to verify the presence of
* the device, but there is no hardware ID register. */
ret = regmap_read(ak4104->regmap, AK4104_REG_RESERVED, &val);
if (ret != 0)
return ret;
if (val != AK4104_RESERVED_VAL)
return -ENODEV;
spi_set_drvdata(spi, ak4104);
ret = snd_soc_register_codec(&spi->dev,
&soc_codec_device_ak4104, &ak4104_dai, 1);
return ret;
}
static int ak4104_spi_remove(struct spi_device *spi)
{
snd_soc_unregister_codec(&spi->dev);
return 0;
}
static const struct of_device_id ak4104_of_match[] = {
{ .compatible = "asahi-kasei,ak4104", },
{ }
};
MODULE_DEVICE_TABLE(of, ak4104_of_match);
static struct spi_driver ak4104_spi_driver = {
.driver = {
.name = DRV_NAME,
.owner = THIS_MODULE,
.of_match_table = ak4104_of_match,
},
.probe = ak4104_spi_probe,
.remove = ak4104_spi_remove,
};
module_spi_driver(ak4104_spi_driver);
MODULE_AUTHOR("Daniel Mack <daniel@caiaq.de>");
MODULE_DESCRIPTION("Asahi Kasei AK4104 ALSA SoC driver");
MODULE_LICENSE("GPL");
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