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authorMark Brown <broonie@opensource.wolfsonmicro.com>2008-09-16 12:51:26 +0100
committerJaroslav Kysela <perex@perex.cz>2008-09-23 08:18:19 +0200
commit2f3dfaf5da3d43a1483b063e9d0692789241febb (patch)
treebe15fc2d8c63078c0d7aa23b073d3fbab9eeb216 /sound/soc/codecs/wm8750.c
parentccbc301e5346e115931ab052837d32778f8fd544 (diff)
downloadlinux-2f3dfaf5da3d43a1483b063e9d0692789241febb.tar.bz2
sound: ASoC: Add WM8750 SPI support
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>
Diffstat (limited to 'sound/soc/codecs/wm8750.c')
-rw-r--r--sound/soc/codecs/wm8750.c70
1 files changed, 69 insertions, 1 deletions
diff --git a/sound/soc/codecs/wm8750.c b/sound/soc/codecs/wm8750.c
index 9847aa064d6b..4892e398a598 100644
--- a/sound/soc/codecs/wm8750.c
+++ b/sound/soc/codecs/wm8750.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>
@@ -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 @@ err_driver:
}
#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);
@@ -1005,6 +1070,9 @@ static int wm8750_remove(struct platform_device *pdev)
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);