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sound: ASoC: Add WM8750 SPI support

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Implement SPI support for WM8750, cut'n'pasting from the support for
WM8731 contributed by Cliff Cai and Alan Horstmann since the wire format
is the same for both codecs.

Also fix a cut'n'pasted comment in the I2C side of the driver (which was
clearly written in the same way) while we're at it.

Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
Signed-off-by: Jaroslav Kysela <perex@perex.cz>
This commit is contained in:
Mark Brown 2008-09-16 12:51:26 +01:00 committed by Jaroslav Kysela
parent ccbc301e53
commit 2f3dfaf5da
2 changed files with 70 additions and 1 deletions
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70
sound/soc/codecs/wm8750.c
View file

@ -19,6 +19,7 @@
#include <linux/pm.h>
#include <linux/i2c.h>
#include <linux/platform_device.h>
#include <linux/spi/spi.h>
#include <sound/core.h>
#include <sound/pcm.h>
#include <sound/pcm_params.h>
@ -841,7 +842,7 @@ static struct snd_soc_device *wm8750_socdev;
#if defined(CONFIG_I2C) || defined(CONFIG_I2C_MODULE)
/*
* WM8731 2 wire address is determined by GPIO5
* WM8750 2 wire address is determined by GPIO5
* state during powerup.
* low = 0x1a
* high = 0x1b
@ -928,6 +929,62 @@ static int wm8750_add_i2c_device(struct platform_device *pdev,
}
#endif
#if defined(CONFIG_SPI_MASTER)
static int __devinit wm8750_spi_probe(struct spi_device *spi)
{
struct snd_soc_device *socdev = wm8750_socdev;
struct snd_soc_codec *codec = socdev->codec;
int ret;
codec->control_data = spi;
ret = wm8750_init(socdev);
if (ret < 0)
dev_err(&spi->dev, "failed to initialise WM8750\n");
return ret;
}
static int __devexit wm8750_spi_remove(struct spi_device *spi)
{
return 0;
}
static struct spi_driver wm8750_spi_driver = {
.driver = {
.name = "wm8750",
.bus = &spi_bus_type,
.owner = THIS_MODULE,
},
.probe = wm8750_spi_probe,
.remove = __devexit_p(wm8750_spi_remove),
};
static int wm8750_spi_write(struct spi_device *spi, const char *data, int len)
{
struct spi_transfer t;
struct spi_message m;
u8 msg[2];
if (len <= 0)
return 0;
msg[0] = data[0];
msg[1] = data[1];
spi_message_init(&m);
memset(&t, 0, (sizeof t));
t.tx_buf = &msg[0];
t.len = len;
spi_message_add_tail(&t, &m);
spi_sync(spi, &m);
return len;
}
#endif
static int wm8750_probe(struct platform_device *pdev)
{
struct snd_soc_device *socdev = platform_get_drvdata(pdev);
@ -963,6 +1020,14 @@ static int wm8750_probe(struct platform_device *pdev)
ret = wm8750_add_i2c_device(pdev, setup);
}
#endif
#if defined(CONFIG_SPI_MASTER)
if (setup->spi) {
codec->hw_write = (hw_write_t)wm8750_spi_write;
ret = spi_register_driver(&wm8750_spi_driver);
if (ret != 0)
printk(KERN_ERR "can't add spi driver");
}
#endif
if (ret != 0) {
kfree(codec->private_data);
@ -1004,6 +1069,9 @@ static int wm8750_remove(struct platform_device *pdev)
#if defined(CONFIG_I2C) || defined(CONFIG_I2C_MODULE)
i2c_unregister_device(codec->control_data);
i2c_del_driver(&wm8750_i2c_driver);
#endif
#if defined(CONFIG_SPI_MASTER)
spi_unregister_driver(&wm8750_spi_driver);
#endif
kfree(codec->private_data);
kfree(codec);

1
sound/soc/codecs/wm8750.h
View file

@ -58,6 +58,7 @@
#define WM8750_SYSCLK 0
struct wm8750_setup_data {
int spi;
int i2c_bus;
unsigned short i2c_address;
};