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linux/sound/soc/codecs/tlv320aic26.c
Bhumika Goyal a180ba45b1 ASoC: codecs: add const to snd_soc_codec_driver structures 
Declare snd_soc_codec_driver structures as const as they are only passed
as an argument to the function snd_soc_register_codec. This argument is
of type const, so declare the structures with this property as const.
In file codecs/sn95031.c, snd_soc_codec_driver structure is also used in
a copy operation along with getting passed to snd_soc_register_codec.
So, it can be made const too.
Done using Coccinelle:

@match disable optional_qualifier@
identifier s;
position p;
@@
static struct snd_soc_codec_driver s@p={...};

@good1@
identifier match.s;
position p;
@@
snd_soc_register_codec(...,&s@p,...)

@bad@
identifier match.s;
position p!={match.p,good1.p};
@@
s@p

@depends on !bad disable optional_qualifier@
identifier match.s;
@@
static
+const
struct snd_soc_codec_driver s={...};

Signed-off-by: Bhumika Goyal <bhumirks@gmail.com>
Signed-off-by: Mark Brown <broonie@kernel.org>
2017-08-10 16:10:50 +01:00

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/*
* 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 regmap *regmap;
struct snd_soc_codec *codec;
int master;
int datfm;
int mclk;
/* Keyclick parameters */
int keyclick_amplitude;
int keyclick_freq;
int keyclick_len;
};
static const struct snd_soc_dapm_widget tlv320aic26_dapm_widgets[] = {
SND_SOC_DAPM_INPUT("MICIN"),
SND_SOC_DAPM_INPUT("AUX"),
SND_SOC_DAPM_OUTPUT("HPL"),
SND_SOC_DAPM_OUTPUT("HPR"),
};
static const struct snd_soc_dapm_route tlv320aic26_dapm_routes[] = {
{ "Capture", NULL, "MICIN" },
{ "Capture", NULL, "AUX" },
{ "HPL", NULL, "Playback" },
{ "HPR", NULL, "Playback" },
};
/* ---------------------------------------------------------------------
* 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_codec *codec = dai->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 width=%d\n", params_rate(params),
params_width(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_width(params)) {
case 8: wlen = AIC26_WLEN_16; break;
case 16: wlen = AIC26_WLEN_16; break;
case 24: wlen = AIC26_WLEN_24; break;
case 32: 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;
snd_soc_write(codec, AIC26_REG_PLL_PROG1, reg);
reg = dval << 2;
snd_soc_write(codec, AIC26_REG_PLL_PROG2, reg);
/* Audio Control 3 (master mode, fsref rate) */
if (aic26->master)
reg = 0x0800;
if (fsref == 48000)
reg = 0x2000;
snd_soc_update_bits(codec, AIC26_REG_AUDIO_CTRL3, 0xf800, reg);
/* Audio Control 1 (FSref divisor) */
reg = wlen | aic26->datfm | (divisor << 3) | divisor;
snd_soc_update_bits(codec, AIC26_REG_AUDIO_CTRL1, 0xfff, 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;
dev_dbg(&aic26->spi->dev, "aic26_mute(dai=%p, mute=%i)\n",
dai, mute);
if (mute)
reg = 0x8080;
else
reg = 0;
snd_soc_update_bits(codec, AIC26_REG_DAC_GAIN, 0x8000, 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 const 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 SOC_ENUM_SINGLE_DECL(aic26_capture_src_enum,
AIC26_REG_AUDIO_CTRL1, 12,
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 = snd_soc_read(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);
snd_soc_update_bits(aic26->codec, AIC26_REG_AUDIO_CTRL2,
0x8000, 0x800);
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)
{
struct aic26 *aic26 = dev_get_drvdata(codec->dev);
int ret, reg;
aic26->codec = codec;
/* Reset the codec to power on defaults */
snd_soc_write(codec, AIC26_REG_RESET, 0xBB00);
/* Power up CODEC */
snd_soc_write(codec, AIC26_REG_POWER_CTRL, 0);
/* Audio Control 3 (master mode, fsref rate) */
reg = snd_soc_read(codec, AIC26_REG_AUDIO_CTRL3);
reg &= ~0xf800;
reg |= 0x0800; /* set master mode */
snd_soc_write(codec, AIC26_REG_AUDIO_CTRL3, reg);
/* 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");
return 0;
}
static const struct snd_soc_codec_driver aic26_soc_codec_dev = {
.probe = aic26_probe,
.component_driver = {
.controls = aic26_snd_controls,
.num_controls = ARRAY_SIZE(aic26_snd_controls),
.dapm_widgets = tlv320aic26_dapm_widgets,
.num_dapm_widgets = ARRAY_SIZE(tlv320aic26_dapm_widgets),
.dapm_routes = tlv320aic26_dapm_routes,
.num_dapm_routes = ARRAY_SIZE(tlv320aic26_dapm_routes),
},
};
static const struct regmap_config aic26_regmap = {
.reg_bits = 16,
.val_bits = 16,
};
/* ---------------------------------------------------------------------
* 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 = devm_kzalloc(&spi->dev, sizeof *aic26, GFP_KERNEL);
if (!aic26)
return -ENOMEM;
aic26->regmap = devm_regmap_init_spi(spi, &aic26_regmap);
if (IS_ERR(aic26->regmap))
return PTR_ERR(aic26->regmap);
/* 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);
return ret;
}
static int aic26_spi_remove(struct spi_device *spi)
{
snd_soc_unregister_codec(&spi->dev);
return 0;
}
static struct spi_driver aic26_spi = {
.driver = {
.name = "tlv320aic26-codec",
},
.probe = aic26_spi_probe,
.remove = aic26_spi_remove,
};
module_spi_driver(aic26_spi);
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