#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
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);
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;
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);
}
}
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 (!wm8524->sysclk)
return 0;
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" },
{ }
};
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");
