From: Cliff Cai cliff.cai@analog.com
[Modified to allow runtime selection between I2C and SPI and to select SPI_MASTER for all codecs build so this is included. -- broonie]
Signed-off-by: Cliff Cai cliff.cai@analog.com Signed-off-by: Bryan Wu cooloney@kernel.org Signed-off-by: Mark Brown broonie@opensource.wolfsonmicro.com --- sound/soc/codecs/Kconfig | 1 + sound/soc/codecs/wm8731.c | 71 +++++++++++++++++++++++++++++++++++++++++++- sound/soc/codecs/wm8731.h | 1 + 3 files changed, 71 insertions(+), 2 deletions(-)
diff --git a/sound/soc/codecs/Kconfig b/sound/soc/codecs/Kconfig index 13ae4fd..cceac73 100644 --- a/sound/soc/codecs/Kconfig +++ b/sound/soc/codecs/Kconfig @@ -2,6 +2,7 @@ config SND_SOC_ALL_CODECS tristate "Build all ASoC CODEC drivers" depends on I2C select SPI + select SPI_MASTER select SND_SOC_AK4535 select SND_SOC_UDA1380 select SND_SOC_WM8510 diff --git a/sound/soc/codecs/wm8731.c b/sound/soc/codecs/wm8731.c index 5814f9b..975befd 100644 --- a/sound/soc/codecs/wm8731.c +++ b/sound/soc/codecs/wm8731.c @@ -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> @@ -652,6 +653,61 @@ err_driver: } #endif
+#if defined(CONFIG_SPI_MASTER) +static int __devinit wm8731_spi_probe(struct spi_device *spi) +{ + struct snd_soc_device *socdev = wm8731_socdev; + struct snd_soc_codec *codec = socdev->codec; + int ret; + + codec->control_data = spi; + + ret = wm8731_init(socdev); + if (ret < 0) + dev_err(&spi->dev, "failed to initialise WM8731\n"); + + return ret; +} + +static int __devexit wm8731_spi_remove(struct spi_device *spi) +{ + return 0; +} + +static struct spi_driver wm8731_spi_driver = { + .driver = { + .name = "wm8731", + .bus = &spi_bus_type, + .owner = THIS_MODULE, + }, + .probe = wm8731_spi_probe, + .remove = __devexit_p(wm8731_spi_remove), +}; + +static int wm8731_spi_write(struct spi_device *spi, const char *data, int len) +{ + struct spi_transfer t; + struct spi_message m; + u16 msg[2]; + + if (len <= 0) + return 0; + + msg[0] = (data[0] << 8) + 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 /* CONFIG_SPI_MASTER */ + static int wm8731_probe(struct platform_device *pdev) { struct snd_soc_device *socdev = platform_get_drvdata(pdev); @@ -680,13 +736,21 @@ static int wm8731_probe(struct platform_device *pdev) INIT_LIST_HEAD(&codec->dapm_paths);
wm8731_socdev = socdev; + ret = -ENODEV; + #if defined(CONFIG_I2C) || defined(CONFIG_I2C_MODULE) if (setup->i2c_address) { codec->hw_write = (hw_write_t)i2c_master_send; ret = wm8731_add_i2c_device(pdev, setup); } -#else - /* Add other interfaces here */ +#endif +#if defined(CONFIG_SPI_MASTER) + if (setup->spi) { + codec->hw_write = (hw_write_t)wm8731_spi_write; + ret = spi_register_driver(&wm8731_spi_driver); + if (ret != 0) + printk(KERN_ERR "can't add spi driver"); + } #endif
if (ret != 0) { @@ -711,6 +775,9 @@ static int wm8731_remove(struct platform_device *pdev) i2c_unregister_device(codec->control_data); i2c_del_driver(&wm8731_i2c_driver); #endif +#if defined(CONFIG_SPI_MASTER) + spi_unregister_driver(&wm8731_spi_driver); +#endif kfree(codec->private_data); kfree(codec);
diff --git a/sound/soc/codecs/wm8731.h b/sound/soc/codecs/wm8731.h index 0f81239..95190e9 100644 --- a/sound/soc/codecs/wm8731.h +++ b/sound/soc/codecs/wm8731.h @@ -35,6 +35,7 @@ #define WM8731_DAI 0
struct wm8731_setup_data { + int spi; int i2c_bus; unsigned short i2c_address; };