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// SPDX-License-Identifier: (GPL-2.0 OR MIT)
//
// Copyright (c) 2018 BayLibre, SAS.
// Author: Jerome Brunet <jbrunet@baylibre.com>
#include <linux/gpio/consumer.h>
#include <linux/of_platform.h>
#include <linux/module.h>
#include <sound/soc.h>
struct es7241_clock_mode {
unsigned int rate_min;
unsigned int rate_max;
unsigned int *slv_mfs;
unsigned int slv_mfs_num;
unsigned int mst_mfs;
unsigned int mst_m0:1;
unsigned int mst_m1:1;
};
struct es7241_chip {
const struct es7241_clock_mode *modes;
unsigned int mode_num;
};
struct es7241_data {
struct gpio_desc *reset;
struct gpio_desc *m0;
struct gpio_desc *m1;
unsigned int fmt;
unsigned int mclk;
bool is_slave;
const struct es7241_chip *chip;
};
static void es7241_set_mode(struct es7241_data *priv, int m0, int m1)
{
/* put the device in reset */
gpiod_set_value_cansleep(priv->reset, 0);
/* set the mode */
gpiod_set_value_cansleep(priv->m0, m0);
gpiod_set_value_cansleep(priv->m1, m1);
/* take the device out of reset - datasheet does not specify a delay */
gpiod_set_value_cansleep(priv->reset, 1);
}
static int es7241_set_slave_mode(struct es7241_data *priv,
const struct es7241_clock_mode *mode,
unsigned int mfs)
{
int j;
if (!mfs)
goto out_ok;
for (j = 0; j < mode->slv_mfs_num; j++) {
if (mode->slv_mfs[j] == mfs)
goto out_ok;
}
return -EINVAL;
out_ok:
es7241_set_mode(priv, 1, 1);
return 0;
}
static int es7241_set_master_mode(struct es7241_data *priv,
const struct es7241_clock_mode *mode,
unsigned int mfs)
{
/*
* We can't really set clock ratio, if the mclk/lrclk is different
* from what we provide, then error out
*/
if (mfs && mfs != mode->mst_mfs)
return -EINVAL;
es7241_set_mode(priv, mode->mst_m0, mode->mst_m1);
return 0;
}
static int es7241_hw_params(struct snd_pcm_substream *substream,
struct snd_pcm_hw_params *params,
struct snd_soc_dai *dai)
{
struct es7241_data *priv = snd_soc_dai_get_drvdata(dai);
unsigned int rate = params_rate(params);
unsigned int mfs = priv->mclk / rate;
int i;
for (i = 0; i < priv->chip->mode_num; i++) {
const struct es7241_clock_mode *mode = &priv->chip->modes[i];
if (rate < mode->rate_min || rate >= mode->rate_max)
continue;
if (priv->is_slave)
return es7241_set_slave_mode(priv, mode, mfs);
else
return es7241_set_master_mode(priv, mode, mfs);
}
/* should not happen */
dev_err(dai->dev, "unsupported rate: %u\n", rate);
return -EINVAL;
}
static int es7241_set_sysclk(struct snd_soc_dai *dai, int clk_id,
unsigned int freq, int dir)
{
struct es7241_data *priv = snd_soc_dai_get_drvdata(dai);
if (dir == SND_SOC_CLOCK_IN && clk_id == 0) {
priv->mclk = freq;
return 0;
}
return -ENOTSUPP;
}
static int es7241_set_fmt(struct snd_soc_dai *dai, unsigned int fmt)
{
struct es7241_data *priv = snd_soc_dai_get_drvdata(dai);
if ((fmt & SND_SOC_DAIFMT_INV_MASK) != SND_SOC_DAIFMT_NB_NF) {
dev_err(dai->dev, "Unsupported dai clock inversion\n");
return -EINVAL;
}
if ((fmt & SND_SOC_DAIFMT_FORMAT_MASK) != priv->fmt) {
dev_err(dai->dev, "Invalid dai format\n");
return -EINVAL;
}
switch (fmt & SND_SOC_DAIFMT_MASTER_MASK) {
case SND_SOC_DAIFMT_CBS_CFS:
priv->is_slave = true;
break;
case SND_SOC_DAIFMT_CBM_CFM:
priv->is_slave = false;
break;
default:
dev_err(dai->dev, "Unsupported clock configuration\n");
return -EINVAL;
}
return 0;
}
static const struct snd_soc_dai_ops es7241_dai_ops = {
.set_fmt = es7241_set_fmt,
.hw_params = es7241_hw_params,
.set_sysclk = es7241_set_sysclk,
};
static struct snd_soc_dai_driver es7241_dai = {
.name = "es7241-hifi",
.capture = {
.stream_name = "Capture",
.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 = &es7241_dai_ops,
};
static const struct es7241_clock_mode es7241_modes[] = {
{
/* Single speed mode */
.rate_min = 8000,
.rate_max = 50000,
.slv_mfs = (unsigned int[]) { 256, 384, 512, 768, 1024 },
.slv_mfs_num = 5,
.mst_mfs = 256,
.mst_m0 = 0,
.mst_m1 = 0,
}, {
/* Double speed mode */
.rate_min = 50000,
.rate_max = 100000,
.slv_mfs = (unsigned int[]) { 128, 192 },
.slv_mfs_num = 2,
.mst_mfs = 128,
.mst_m0 = 1,
.mst_m1 = 0,
}, {
/* Quad speed mode */
.rate_min = 100000,
.rate_max = 200000,
.slv_mfs = (unsigned int[]) { 64 },
.slv_mfs_num = 1,
.mst_mfs = 64,
.mst_m0 = 0,
.mst_m1 = 1,
},
};
static const struct es7241_chip es7241_chip __maybe_unused = {
.modes = es7241_modes,
.mode_num = ARRAY_SIZE(es7241_modes),
};
static const struct snd_soc_dapm_widget es7241_dapm_widgets[] = {
SND_SOC_DAPM_INPUT("AINL"),
SND_SOC_DAPM_INPUT("AINR"),
SND_SOC_DAPM_DAC("ADC", "Capture", SND_SOC_NOPM, 0, 0),
SND_SOC_DAPM_REGULATOR_SUPPLY("VDDP", 0, 0),
SND_SOC_DAPM_REGULATOR_SUPPLY("VDDD", 0, 0),
SND_SOC_DAPM_REGULATOR_SUPPLY("VDDA", 0, 0),
};
static const struct snd_soc_dapm_route es7241_dapm_routes[] = {
{ "ADC", NULL, "AINL", },
{ "ADC", NULL, "AINR", },
{ "ADC", NULL, "VDDA", },
{ "Capture", NULL, "VDDP", },
{ "Capture", NULL, "VDDD", },
};
static const struct snd_soc_component_driver es7241_component_driver = {
.dapm_widgets = es7241_dapm_widgets,
.num_dapm_widgets = ARRAY_SIZE(es7241_dapm_widgets),
.dapm_routes = es7241_dapm_routes,
.num_dapm_routes = ARRAY_SIZE(es7241_dapm_routes),
.idle_bias_on = 1,
.endianness = 1,
.non_legacy_dai_naming = 1,
};
static void es7241_parse_fmt(struct device *dev, struct es7241_data *priv)
{
bool is_leftj;
/*
* The format is given by a pull resistor on the SDOUT pin:
* pull-up for i2s, pull-down for left justified.
*/
is_leftj = of_property_read_bool(dev->of_node,
"everest,sdout-pull-down");
if (is_leftj)
priv->fmt = SND_SOC_DAIFMT_LEFT_J;
else
priv->fmt = SND_SOC_DAIFMT_I2S;
}
static int es7241_probe(struct platform_device *pdev)
{
struct device *dev = &pdev->dev;
struct es7241_data *priv;
int err;
priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL);
if (!priv)
return -ENOMEM;
platform_set_drvdata(pdev, priv);
priv->chip = of_device_get_match_data(dev);
if (!priv->chip) {
dev_err(dev, "failed to match device\n");
return -ENODEV;
}
es7241_parse_fmt(dev, priv);
priv->reset = devm_gpiod_get_optional(dev, "reset", GPIOD_OUT_LOW);
if (IS_ERR(priv->reset)) {
err = PTR_ERR(priv->reset);
if (err != -EPROBE_DEFER)
dev_err(dev, "Failed to get 'reset' gpio: %d", err);
return err;
}
priv->m0 = devm_gpiod_get_optional(dev, "m0", GPIOD_OUT_LOW);
if (IS_ERR(priv->m0)) {
err = PTR_ERR(priv->m0);
if (err != -EPROBE_DEFER)
dev_err(dev, "Failed to get 'm0' gpio: %d", err);
return err;
}
priv->m1 = devm_gpiod_get_optional(dev, "m1", GPIOD_OUT_LOW);
if (IS_ERR(priv->m1)) {
err = PTR_ERR(priv->m1);
if (err != -EPROBE_DEFER)
dev_err(dev, "Failed to get 'm1' gpio: %d", err);
return err;
}
return devm_snd_soc_register_component(&pdev->dev,
&es7241_component_driver,
&es7241_dai, 1);
}
#ifdef CONFIG_OF
static const struct of_device_id es7241_ids[] = {
{ .compatible = "everest,es7241", .data = &es7241_chip },
{ }
};
MODULE_DEVICE_TABLE(of, es7241_ids);
#endif
static struct platform_driver es7241_driver = {
.driver = {
.name = "es7241",
.of_match_table = of_match_ptr(es7241_ids),
},
.probe = es7241_probe,
};
module_platform_driver(es7241_driver);
MODULE_DESCRIPTION("ASoC ES7241 audio codec driver");
MODULE_AUTHOR("Jerome Brunet <jbrunet@baylibre.com>");
MODULE_LICENSE("GPL");
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