// SPDX-License-Identifier: GPL-2.0-only
/*
* wm8524.c -- WM8524 ALSA SoC Audio driver
*
* Copyright 2009 Wolfson Microelectronics plc
* Copyright 2017 NXP
*
* Based on WM8523 ALSA SoC Audio driver written by Mark Brown
*/
#include <linux/mod_devicetable.h>
#include <linux/module.h>
#include <linux/moduleparam.h>
#include <linux/init.h>
#include <linux/delay.h>
#include <linux/slab.h>
#include <linux/gpio/consumer.h>
#include <sound/core.h>
#include <sound/pcm.h>
#include <sound/pcm_params.h>
#include <sound/soc.h>
#include <sound/initval.h>
#define WM8524_NUM_RATES 12
/* codec private data */
struct wm8524_priv {
struct gpio_desc *mute;
unsigned int sysclk;
unsigned int rate_constraint_list[WM8524_NUM_RATES];
struct snd_pcm_hw_constraint_list rate_constraint;
};
static const struct snd_soc_dapm_widget wm8524_dapm_widgets[] = {
SND_SOC_DAPM_DAC("DAC" , "Playback" , SND_SOC_NOPM, 0 , 0 ),
SND_SOC_DAPM_OUTPUT("LINEVOUTL" ),
SND_SOC_DAPM_OUTPUT("LINEVOUTR" ),
};
static const struct snd_soc_dapm_route wm8524_dapm_routes[] = {
{ "LINEVOUTL" , NULL, "DAC" },
{ "LINEVOUTR" , NULL, "DAC" },
};
static const struct {
int value;
int ratio;
} lrclk_ratios[] = {
{ 1 , 128 },
{ 2 , 192 },
{ 3 , 256 },
{ 4 , 384 },
{ 5 , 512 },
{ 6 , 768 },
{ 7 , 1152 },
};
static int wm8524_startup(struct snd_pcm_substream *substream,
struct snd_soc_dai *dai)
{
struct snd_soc_component *component = dai->component;
struct wm8524_priv *wm8524 = snd_soc_component_get_drvdata(component);
/* The set of sample rates that can be supported depends on the
* MCLK supplied to the CODEC.
*/
if (wm8524->sysclk)
snd_pcm_hw_constraint_list(substream->runtime, 0 ,
SNDRV_PCM_HW_PARAM_RATE,
&wm8524->rate_constraint);
gpiod_set_value_cansleep(wm8524->mute, 1 );
return 0 ;
}
static void wm8524_shutdown(struct snd_pcm_substream *substream,
struct snd_soc_dai *dai)
{
struct snd_soc_component *component = dai->component;
struct wm8524_priv *wm8524 = snd_soc_component_get_drvdata(component);
gpiod_set_value_cansleep(wm8524->mute, 0 );
}
static int wm8524_set_dai_sysclk(struct snd_soc_dai *codec_dai,
int clk_id, unsigned int freq, int dir)
{
struct snd_soc_component *component = codec_dai->component;
struct wm8524_priv *wm8524 = snd_soc_component_get_drvdata(component);
unsigned int val;
int i, j = 0 ;
wm8524->rate_constraint.count = 0 ;
wm8524->sysclk = freq;
if (!wm8524->sysclk)
return 0 ;
for (i = 0 ; i < ARRAY_SIZE(lrclk_ratios); i++) {
val = freq / lrclk_ratios[i].ratio;
/* Check that it's a standard rate since core can't
* cope with others and having the odd rates confuses
* constraint matching.
*/
switch (val) {
case 8000 :
case 11025 :
case 16000 :
case 22050 :
case 32000 :
case 44100 :
case 48000 :
case 64000 :
case 88200 :
case 96000 :
case 176400 :
case 192000 :
dev_dbg(component->dev, "Supported sample rate: %dHz\n" ,
val);
wm8524->rate_constraint_list[j++] = val;
wm8524->rate_constraint.count++;
break ;
default :
dev_dbg(component->dev, "Skipping sample rate: %dHz\n" ,
val);
}
}
/* Need at least one supported rate... */
if (wm8524->rate_constraint.count == 0 )
return -EINVAL;
return 0 ;
}
static int wm8524_set_fmt(struct snd_soc_dai *codec_dai, unsigned int fmt)
{
fmt &= (SND_SOC_DAIFMT_FORMAT_MASK | SND_SOC_DAIFMT_INV_MASK |
SND_SOC_DAIFMT_MASTER_MASK);
if (fmt != (SND_SOC_DAIFMT_I2S | SND_SOC_DAIFMT_NB_NF |
SND_SOC_DAIFMT_CBC_CFC)) {
dev_err(codec_dai->dev, "Invalid DAI format\n" );
return -EINVAL;
}
return 0 ;
}
static int wm8524_mute_stream(struct snd_soc_dai *dai, int mute, int stream)
{
struct wm8524_priv *wm8524 = snd_soc_component_get_drvdata(dai->component);
if (wm8524->mute)
gpiod_set_value_cansleep(wm8524->mute, mute);
return 0 ;
}
static int wm8524_hw_params(struct snd_pcm_substream *substream,
struct snd_pcm_hw_params *params,
struct snd_soc_dai *dai)
{
struct snd_soc_component *component = dai->component;
struct wm8524_priv *wm8524 = snd_soc_component_get_drvdata(component);
int i;
/* If sysclk is not configured, no need to check the rate */
if (!wm8524->sysclk)
return 0 ;
/* Find a supported LRCLK rate */
for (i = 0 ; i < wm8524->rate_constraint.count; i++) {
if (wm8524->rate_constraint.list[i] == params_rate(params))
break ;
}
if (i == wm8524->rate_constraint.count) {
dev_err(component->dev, "LRCLK %d unsupported with MCLK %d\n" ,
params_rate(params), wm8524->sysclk);
return -EINVAL;
}
return 0 ;
}
#define WM8524_RATES SNDRV_PCM_RATE_8000_192000
#define WM8524_FORMATS (SNDRV_PCM_FMTBIT_S16_LE |\
SNDRV_PCM_FMTBIT_S24_LE |\
SNDRV_PCM_FMTBIT_S32_LE)
static const struct snd_soc_dai_ops wm8524_dai_ops = {
.startup = wm8524_startup,
.shutdown = wm8524_shutdown,
.set_sysclk = wm8524_set_dai_sysclk,
.set_fmt = wm8524_set_fmt,
.mute_stream = wm8524_mute_stream,
.hw_params = wm8524_hw_params,
};
static struct snd_soc_dai_driver wm8524_dai = {
.name = "wm8524-hifi" ,
.playback = {
.stream_name = "Playback" ,
.channels_min = 2 ,
.channels_max = 2 ,
.rates = WM8524_RATES,
.formats = WM8524_FORMATS,
},
.ops = &wm8524_dai_ops,
};
static int wm8524_probe(struct snd_soc_component *component)
{
struct wm8524_priv *wm8524 = snd_soc_component_get_drvdata(component);
wm8524->rate_constraint.list = &wm8524->rate_constraint_list[0 ];
wm8524->rate_constraint.count =
ARRAY_SIZE(wm8524->rate_constraint_list);
return 0 ;
}
static const struct snd_soc_component_driver soc_component_dev_wm8524 = {
.probe = wm8524_probe,
.dapm_widgets = wm8524_dapm_widgets,
.num_dapm_widgets = ARRAY_SIZE(wm8524_dapm_widgets),
.dapm_routes = wm8524_dapm_routes,
.num_dapm_routes = ARRAY_SIZE(wm8524_dapm_routes),
.idle_bias_on = 1 ,
.use_pmdown_time = 1 ,
.endianness = 1 ,
};
static const struct of_device_id wm8524_of_match[] = {
{ .compatible = "wlf,wm8524" },
{ /* sentinel*/ }
};
MODULE_DEVICE_TABLE(of, wm8524_of_match);
static int wm8524_codec_probe(struct platform_device *pdev)
{
struct wm8524_priv *wm8524;
int ret;
wm8524 = devm_kzalloc(&pdev->dev, sizeof (struct wm8524_priv),
GFP_KERNEL);
if (wm8524 == NULL)
return -ENOMEM;
platform_set_drvdata(pdev, wm8524);
wm8524->mute = devm_gpiod_get(&pdev->dev, "wlf,mute" , GPIOD_OUT_LOW);
if (IS_ERR(wm8524->mute)) {
ret = PTR_ERR(wm8524->mute);
dev_err_probe(&pdev->dev, ret, "Failed to get mute line\n" );
return ret;
}
ret = devm_snd_soc_register_component(&pdev->dev,
&soc_component_dev_wm8524, &wm8524_dai, 1 );
if (ret < 0 )
dev_err(&pdev->dev, "Failed to register component: %d\n" , ret);
return ret;
}
static struct platform_driver wm8524_codec_driver = {
.probe = wm8524_codec_probe,
.driver = {
.name = "wm8524-codec" ,
.of_match_table = wm8524_of_match,
},
};
module_platform_driver(wm8524_codec_driver);
MODULE_DESCRIPTION("ASoC WM8524 driver" );
MODULE_AUTHOR("Mihai Serban <mihai.serban@nxp.com>" );
MODULE_ALIAS("platform:wm8524-codec" );
MODULE_LICENSE("GPL" );
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