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authorCliff Cai <cliff.cai@analog.com>2008-09-01 18:47:03 +0100
committerJaroslav Kysela <perex@perex.cz>2008-09-04 10:34:27 +0200
commitd2a403553ba7659d85dae2a05b1f3767d2fefcfe (patch)
treee902a5a87e8aa5359d2c7e7331ca22babf1694d6
parente5d3fd38f93755c5ab1e04b8e40196135f576355 (diff)
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 <cliff.cai@analog.com> Signed-off-by: Bryan Wu <cooloney@kernel.org> Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com> Signed-off-by: Takashi Iwai <tiwai@suse.de> Signed-off-by: Jaroslav Kysela <perex@perex.cz>
-rw-r--r--sound/soc/codecs/Kconfig1
-rw-r--r--sound/soc/codecs/wm8731.c71
-rw-r--r--sound/soc/codecs/wm8731.h1
3 files changed, 71 insertions, 2 deletions
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 <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 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;
};