Quelle  wm1250-ev1.c   Sprache: C

// SPDX-License-Identifier: GPL-2.0-or-later
/*
 * Driver for the 1250-EV1 audio I/O module
 *
 * Copyright 2011 Wolfson Microelectronics plc
 */

#include <linux/init.h>
#include <linux/module.h>
#include <linux/slab.h>
#include <linux/i2c.h>
#include <linux/gpio/consumer.h>

#include <sound/soc.h>
#include <sound/soc-dapm.h>

struct wm1250_priv {
 struct gpio_desc *clk_ena;
 struct gpio_desc *clk_sel0;
 struct gpio_desc *clk_sel1;
 struct gpio_desc *osr;
 struct gpio_desc *master;
};

static int wm1250_ev1_set_bias_level(struct snd_soc_component *component,
         enum snd_soc_bias_level level)
{
 struct wm1250_priv *wm1250 = dev_get_drvdata(component->dev);

 switch (level) {
 case SND_SOC_BIAS_ON:
  break;

 case SND_SOC_BIAS_PREPARE:
  break;

 case SND_SOC_BIAS_STANDBY:
  gpiod_set_value_cansleep(wm1250->clk_ena, 1);
  break;

 case SND_SOC_BIAS_OFF:
  gpiod_set_value_cansleep(wm1250->clk_ena, 0);
  break;
 }

 return 0;
}

static const struct snd_soc_dapm_widget wm1250_ev1_dapm_widgets[] = {
SND_SOC_DAPM_ADC("ADC", "wm1250-ev1 Capture", SND_SOC_NOPM, 0, 0),
SND_SOC_DAPM_DAC("DAC", "wm1250-ev1 Playback", SND_SOC_NOPM, 0, 0),

SND_SOC_DAPM_INPUT("WM1250 Input"),
SND_SOC_DAPM_OUTPUT("WM1250 Output"),
};

static const struct snd_soc_dapm_route wm1250_ev1_dapm_routes[] = {
 { "ADC", NULL, "WM1250 Input" },
 { "WM1250 Output", NULL, "DAC" },
};

static int wm1250_ev1_hw_params(struct snd_pcm_substream *substream,
    struct snd_pcm_hw_params *params,
    struct snd_soc_dai *dai)
{
 struct wm1250_priv *wm1250 = snd_soc_component_get_drvdata(dai->component);

 switch (params_rate(params)) {
 case 8000:
  gpiod_set_value(wm1250->clk_sel0, 1);
  gpiod_set_value(wm1250->clk_sel1, 1);
  break;
 case 16000:
  gpiod_set_value(wm1250->clk_sel0, 0);
  gpiod_set_value(wm1250->clk_sel1, 1);
  break;
 case 32000:
  gpiod_set_value(wm1250->clk_sel0, 1);
  gpiod_set_value(wm1250->clk_sel1, 0);
  break;
 case 64000:
  gpiod_set_value(wm1250->clk_sel0, 0);
  gpiod_set_value(wm1250->clk_sel1, 0);
  break;
 default:
  return -EINVAL;
 }

 return 0;
}

static const struct snd_soc_dai_ops wm1250_ev1_ops = {
 .hw_params = wm1250_ev1_hw_params,
};

#define WM1250_EV1_RATES (SNDRV_PCM_RATE_8000 | SNDRV_PCM_RATE_16000 |\
     SNDRV_PCM_RATE_32000 | SNDRV_PCM_RATE_64000)

static struct snd_soc_dai_driver wm1250_ev1_dai = {
 .name = "wm1250-ev1",
 .playback = {
  .stream_name = "Playback",
  .channels_min = 1,
  .channels_max = 2,
  .rates = WM1250_EV1_RATES,
  .formats = SNDRV_PCM_FMTBIT_S16_LE,
 },
 .capture = {
  .stream_name = "Capture",
  .channels_min = 1,
  .channels_max = 2,
  .rates = WM1250_EV1_RATES,
  .formats = SNDRV_PCM_FMTBIT_S16_LE,
 },
 .ops = &wm1250_ev1_ops,
};

static const struct snd_soc_component_driver soc_component_dev_wm1250_ev1 = {
 .dapm_widgets  = wm1250_ev1_dapm_widgets,
 .num_dapm_widgets = ARRAY_SIZE(wm1250_ev1_dapm_widgets),
 .dapm_routes  = wm1250_ev1_dapm_routes,
 .num_dapm_routes = ARRAY_SIZE(wm1250_ev1_dapm_routes),
 .set_bias_level  = wm1250_ev1_set_bias_level,
 .use_pmdown_time = 1,
 .endianness  = 1,
};

static int wm1250_ev1_pdata(struct i2c_client *i2c)
{
 struct wm1250_ev1_pdata *pdata = dev_get_platdata(&i2c->dev);
 struct wm1250_priv *wm1250;

 if (!pdata)
  return 0;

 wm1250 = devm_kzalloc(&i2c->dev, sizeof(*wm1250), GFP_KERNEL);
 if (!wm1250)
  return -ENOMEM;

 wm1250->clk_ena = devm_gpiod_get(&i2c->dev, "clk-ena", GPIOD_OUT_LOW);
 if (IS_ERR(wm1250->clk_ena))
  return dev_err_probe(&i2c->dev, PTR_ERR(wm1250->clk_ena),
         "failed to get clock enable GPIO\n");

 wm1250->clk_sel0 = devm_gpiod_get(&i2c->dev, "clk-sel0", GPIOD_OUT_HIGH);
 if (IS_ERR(wm1250->clk_sel0))
  return dev_err_probe(&i2c->dev, PTR_ERR(wm1250->clk_sel0),
         "failed to get clock sel0 GPIO\n");

 wm1250->clk_sel1 = devm_gpiod_get(&i2c->dev, "clk-sel1", GPIOD_OUT_HIGH);
 if (IS_ERR(wm1250->clk_sel1))
  return dev_err_probe(&i2c->dev, PTR_ERR(wm1250->clk_sel1),
         "failed to get clock sel1 GPIO\n");

 wm1250->osr = devm_gpiod_get(&i2c->dev, "osr", GPIOD_OUT_LOW);
 if (IS_ERR(wm1250->osr))
  return dev_err_probe(&i2c->dev, PTR_ERR(wm1250->osr),
         "failed to get OSR GPIO\n");

 wm1250->master = devm_gpiod_get(&i2c->dev, "master", GPIOD_OUT_LOW);
 if (IS_ERR(wm1250->master))
  return dev_err_probe(&i2c->dev, PTR_ERR(wm1250->master),
         "failed to get MASTER GPIO\n");

 dev_set_drvdata(&i2c->dev, wm1250);

 return 0;
}

static int wm1250_ev1_probe(struct i2c_client *i2c)
{
 int id, board, rev, ret;

 dev_set_drvdata(&i2c->dev, NULL);

 board = i2c_smbus_read_byte_data(i2c, 0);
 if (board < 0) {
  dev_err(&i2c->dev, "Failed to read ID: %d\n", board);
  return board;
 }

 id = (board & 0xfe) >> 2;
 rev = board & 0x3;

 if (id != 1) {
  dev_err(&i2c->dev, "Unknown board ID %d\n", id);
  return -ENODEV;
 }

 dev_info(&i2c->dev, "revision %d\n", rev + 1);

 ret = wm1250_ev1_pdata(i2c);
 if (ret != 0)
  return ret;

 ret = devm_snd_soc_register_component(&i2c->dev, &soc_component_dev_wm1250_ev1,
         &wm1250_ev1_dai, 1);
 if (ret != 0) {
  dev_err(&i2c->dev, "Failed to register CODEC: %d\n", ret);
  return ret;
 }

 return 0;
}

static const struct i2c_device_id wm1250_ev1_i2c_id[] = {
 { "wm1250-ev1" },
 { }
};
MODULE_DEVICE_TABLE(i2c, wm1250_ev1_i2c_id);

static struct i2c_driver wm1250_ev1_i2c_driver = {
 .driver = {
  .name = "wm1250-ev1",
 },
 .probe =    wm1250_ev1_probe,
 .id_table = wm1250_ev1_i2c_id,
};

module_i2c_driver(wm1250_ev1_i2c_driver);

MODULE_AUTHOR("Mark Brown ");
MODULE_DESCRIPTION("WM1250-EV1 audio I/O module driver");
MODULE_LICENSE("GPL");