From d2a403553ba7659d85dae2a05b1f3767d2fefcfe Mon Sep 17 00:00:00 2001 From: Cliff Cai Date: Mon, 1 Sep 2008 18:47:03 +0100 Subject: ALSA: ASoC: Add SPI support for WM8731 [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 Signed-off-by: Bryan Wu Signed-off-by: Mark Brown Signed-off-by: Takashi Iwai Signed-off-by: Jaroslav Kysela --- sound/soc/codecs/Kconfig | 1 + sound/soc/codecs/wm8731.c | 71 +++++++++++++++++++++++++++++++++++++++++++++-- sound/soc/codecs/wm8731.h | 1 + 3 files changed, 71 insertions(+), 2 deletions(-) (limited to 'sound/soc') diff --git a/sound/soc/codecs/Kconfig b/sound/soc/codecs/Kconfig index 13ae4fd2d17..cceac73aff0 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 5814f9bdf0c..975befdfd88 100644 --- a/sound/soc/codecs/wm8731.c +++ b/sound/soc/codecs/wm8731.c @@ -19,6 +19,7 @@ #include #include #include +#include #include #include #include @@ -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) { @@ -710,6 +774,9 @@ static int wm8731_remove(struct platform_device *pdev) #if defined(CONFIG_I2C) || defined(CONFIG_I2C_MODULE) 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 0f8123909ab..95190e9c0c1 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; }; -- cgit v1.2.3