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ASoC: Add platform data for WM1250 EV1 GPIOs 

The WM1250 EV1 has some GPIOs which can be used to control the behaviour
at runtime. Request them all if supplied and add a set_bias_level()
function to start and stop the clocks.

Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
This commit is contained in:
Mark Brown 2011-09-21 20:54:47 +01:00
parent 85a843c50f
commit 213eb0fb1e
2 changed files with 145 additions and 3 deletions
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27
include/sound/wm1250-ev1.h Normal file
View File

@ -0,0 +1,27 @@
/*
* linux/sound/wm1250-ev1.h - Platform data for WM1250-EV1
*
* 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 version 2 as
* published by the Free Software Foundation.
*/
#ifndef __LINUX_SND_WM1250_EV1_H
#define __LINUX_SND_WM1250_EV1_H
#define WM1250_EV1_NUM_GPIOS 5
#define WM1250_EV1_GPIO_CLK_ENA 0
#define WM1250_EV1_GPIO_CLK_SEL0 1
#define WM1250_EV1_GPIO_CLK_SEL1 2
#define WM1250_EV1_GPIO_OSR 3
#define WM1250_EV1_GPIO_MASTER 4
struct wm1250_ev1_pdata {
int gpios[WM1250_EV1_NUM_GPIOS];
};
#endif

121
sound/soc/codecs/wm1250-ev1.c
View File

@ -12,10 +12,59 @@
#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),
@ -53,12 +102,66 @@ static struct snd_soc_codec_driver soc_codec_dev_wm1250_ev1 = {
.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,
};
static int __devinit 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 = kzalloc(sizeof(*wm1250), GFP_KERNEL);
if (!wm1250) {
dev_err(&i2c->dev, "Unable to allocate private data\n");
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_alloc;
}
dev_set_drvdata(&i2c->dev, wm1250);
return ret;
err_alloc:
kfree(wm1250);
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));
kfree(wm1250);
}
}
static int __devinit wm1250_ev1_probe(struct i2c_client *i2c,
const struct i2c_device_id *i2c_id)
{
int id, board, rev;
int id, board, rev, ret;
dev_set_drvdata(&i2c->dev, NULL);
board = i2c_smbus_read_byte_data(i2c, 0);
if (board < 0) {
@ -76,13 +179,25 @@ static int __devinit wm1250_ev1_probe(struct i2c_client *i2c,
dev_info(&i2c->dev, "revision %d\n", rev + 1);
return snd_soc_register_codec(&i2c->dev, &soc_codec_dev_wm1250_ev1,
&wm1250_ev1_dai, 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 __devexit wm1250_ev1_remove(struct i2c_client *i2c)
{
snd_soc_unregister_codec(&i2c->dev);
wm1250_ev1_free(i2c);
return 0;
}