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Subject[PATCH 3/4] ASOC: WM8731 codec: add SPI support as well as I2C
Date
From: Cliff Cai <cliff.cai@analog.com>

Signed-off-by: Cliff Cai <cliff.cai@analog.com>
Signed-off-by: Bryan Wu <cooloney@kernel.org>
---
sound/soc/codecs/Kconfig | 5 +++
sound/soc/codecs/wm8731.c | 71 +++++++++++++++++++++++++++++++++++++++++++--
2 files changed, 73 insertions(+), 3 deletions(-)

diff --git a/sound/soc/codecs/Kconfig b/sound/soc/codecs/Kconfig
index 67ed3f2..21bb277 100644
--- a/sound/soc/codecs/Kconfig
+++ b/sound/soc/codecs/Kconfig
@@ -21,6 +21,11 @@ config SND_SOC_SSM2602
config SND_SOC_WM8731
tristate

+config SND_SOC_WM8731_SPI
+ bool "Control interface: Use SPI instead of I2C"
+ depends on SND_SOC_WM8731
+ default n
+
config SND_SOC_WM8750
tristate

diff --git a/sound/soc/codecs/wm8731.c b/sound/soc/codecs/wm8731.c
index 9402fca..56a0ff1 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>
@@ -562,7 +563,7 @@ pcm_err:

static struct snd_soc_device *wm8731_socdev;

-#if defined(CONFIG_I2C) || defined(CONFIG_I2C_MODULE)
+#if defined (CONFIG_I2C) || defined (CONFIG_I2C_MODULE) && !defined (CONFIG_SND_SOC_WM8731_SPI)

/*
* WM8731 2 wire address is determined by GPIO5
@@ -652,6 +653,62 @@ static struct i2c_client client_template = {
};
#endif

+#if defined(CONFIG_SPI_MASTER) && defined(CONFIG_SND_SOC_WM8731_SPI)
+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) {
+ err("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);
@@ -680,7 +737,7 @@ static int wm8731_probe(struct platform_device *pdev)
INIT_LIST_HEAD(&codec->dapm_paths);

wm8731_socdev = socdev;
-#if defined(CONFIG_I2C) || defined(CONFIG_I2C_MODULE)
+#if defined (CONFIG_I2C) || defined (CONFIG_I2C_MODULE) && !defined (CONFIG_SND_SOC_WM8731_SPI)
if (setup->i2c_address) {
normal_i2c[0] = setup->i2c_address;
codec->hw_write = (hw_write_t)i2c_master_send;
@@ -688,8 +745,14 @@ static int wm8731_probe(struct platform_device *pdev)
if (ret != 0)
printk(KERN_ERR "can't add i2c driver");
}
+#elif defined (CONFIG_SPI_MASTER) && defined (CONFIG_SND_SOC_WM8731_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");
#else
/* Add other interfaces here */
+
#endif

if (ret != 0) {
@@ -710,8 +773,10 @@ static int wm8731_remove(struct platform_device *pdev)

snd_soc_free_pcms(socdev);
snd_soc_dapm_free(socdev);
-#if defined(CONFIG_I2C) || defined(CONFIG_I2C_MODULE)
+#if defined (CONFIG_I2C) || defined (CONFIG_I2C_MODULE) && !defined (CONFIG_SND_SOC_WM8731_SPI)
i2c_del_driver(&wm8731_i2c_driver);
+#elif defined (CONFIG_SPI_MASTER) && defined (CONFIG_SND_SOC_WM8731_SPI)
+ spi_unregister_driver(&wm8731_spi_driver);
#endif
kfree(codec->private_data);
kfree(codec);
--
1.5.6

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