- 根目录:
- sound
- soc
- codecs
- wm1250-ev1.c
/*
* Driver for the 1250-EV1 audio I/O module
*
* Copyright 2011 Wolfson Microelectronics plc
*
* This program is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License as published by the
* Free Software Foundation; either version 2 of the License, or (at your
* option) any later version.
*
*/
#include <linux/init.h>
#include <linux/module.h>
#include <linux/slab.h>
#include <linux/i2c.h>
#include <linux/gpio.h>
#include <sound/soc.h>
#include <sound/soc-dapm.h>
#include <sound/wm1250-ev1.h>
static const char *wm1250_gpio_names[WM1250_EV1_NUM_GPIOS] = {
"WM1250 CLK_ENA",
"WM1250 CLK_SEL0",
"WM1250 CLK_SEL1",
"WM1250 OSR",
"WM1250 MASTER",
};
struct wm1250_priv {
struct gpio gpios[WM1250_EV1_NUM_GPIOS];
};
static int wm1250_ev1_set_bias_level(struct snd_soc_codec *codec,
enum snd_soc_bias_level level)
{
struct wm1250_priv *wm1250 = dev_get_drvdata(codec->dev);
int ena;
if (wm1250)
ena = wm1250->gpios[WM1250_EV1_GPIO_CLK_ENA].gpio;
else
ena = -1;
switch (level) {
case SND_SOC_BIAS_ON:
break;
case SND_SOC_BIAS_PREPARE:
break;
case SND_SOC_BIAS_STANDBY:
if (ena >= 0)
gpio_set_value_cansleep(ena, 1);
break;
case SND_SOC_BIAS_OFF:
if (ena >= 0)
gpio_set_value_cansleep(ena, 0);
break;
}
codec->dapm.bias_level = level;
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_codec_get_drvdata(dai->codec);
switch (params_rate(params)) {
case 8000:
gpio_set_value(wm1250->gpios[WM1250_EV1_GPIO_CLK_SEL0].gpio,
1);
gpio_set_value(wm1250->gpios[WM1250_EV1_GPIO_CLK_SEL1].gpio,
1);
break;
case 16000:
gpio_set_value(wm1250->gpios[WM1250_EV1_GPIO_CLK_SEL0].gpio,
0);
gpio_set_value(wm1250->gpios[WM1250_EV1_GPIO_CLK_SEL1].gpio,
1);
break;
case 32000:
gpio_set_value(wm1250->gpios[WM1250_EV1_GPIO_CLK_SEL0].gpio,
1);
gpio_set_value(wm1250->gpios[WM1250_EV1_GPIO_CLK_SEL1].gpio,
0);
break;
case 64000:
gpio_set_value(wm1250->gpios[WM1250_EV1_GPIO_CLK_SEL0].gpio,
0);
gpio_set_value(wm1250->gpios[WM1250_EV1_GPIO_CLK_SEL1].gpio,
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 struct snd_soc_codec_driver soc_codec_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,
.idle_bias_off = true,
};
static int wm1250_ev1_pdata(struct i2c_client *i2c)
{
struct wm1250_ev1_pdata *pdata = dev_get_platdata(&i2c->dev);
struct wm1250_priv *wm1250;
int i, ret;
if (!pdata)
return 0;
wm1250 = devm_kzalloc(&i2c->dev, sizeof(*wm1250), GFP_KERNEL);
if (!wm1250) {
ret = -ENOMEM;
goto err;
}
for (i = 0; i < ARRAY_SIZE(wm1250->gpios); i++) {
wm1250->gpios[i].gpio = pdata->gpios[i];
wm1250->gpios[i].label = wm1250_gpio_names[i];
wm1250->gpios[i].flags = GPIOF_OUT_INIT_LOW;
}
wm1250->gpios[WM1250_EV1_GPIO_CLK_SEL0].flags = GPIOF_OUT_INIT_HIGH;
wm1250->gpios[WM1250_EV1_GPIO_CLK_SEL1].flags = GPIOF_OUT_INIT_HIGH;
ret = gpio_request_array(wm1250->gpios, ARRAY_SIZE(wm1250->gpios));
if (ret != 0) {
dev_err(&i2c->dev, "Failed to get GPIOs: %d\n", ret);
goto err;
}
dev_set_drvdata(&i2c->dev, wm1250);
return ret;
err:
return ret;
}
static void wm1250_ev1_free(struct i2c_client *i2c)
{
struct wm1250_priv *wm1250 = dev_get_drvdata(&i2c->dev);
if (wm1250)
gpio_free_array(wm1250->gpios, ARRAY_SIZE(wm1250->gpios));
}
static int wm1250_ev1_probe(struct i2c_client *i2c,
const struct i2c_device_id *i2c_id)
{
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 = snd_soc_register_codec(&i2c->dev, &soc_codec_dev_wm1250_ev1,
&wm1250_ev1_dai, 1);
if (ret != 0) {
dev_err(&i2c->dev, "Failed to register CODEC: %d\n", ret);
wm1250_ev1_free(i2c);
return ret;
}
return 0;
}
static int wm1250_ev1_remove(struct i2c_client *i2c)
{
snd_soc_unregister_codec(&i2c->dev);
wm1250_ev1_free(i2c);
return 0;
}
static const struct i2c_device_id wm1250_ev1_i2c_id[] = {
{ "wm1250-ev1", 0 },
{ }
};
MODULE_DEVICE_TABLE(i2c, wm1250_ev1_i2c_id);
static struct i2c_driver wm1250_ev1_i2c_driver = {
.driver = {
.name = "wm1250-ev1",
.owner = THIS_MODULE,
},
.probe = wm1250_ev1_probe,
.remove = wm1250_ev1_remove,
.id_table = wm1250_ev1_i2c_id,
};
module_i2c_driver(wm1250_ev1_i2c_driver);
MODULE_AUTHOR("Mark Brown <broonie@opensource.wolfsonmicro.com>");
MODULE_DESCRIPTION("WM1250-EV1 audio I/O module driver");
MODULE_LICENSE("GPL");