[PATCH 4/6] ASoC: wm8974: add SPI as a possible bus master

@@ -104,7 +104,7 @@ config SND_SOC_ALL_CODECS
 	select SND_SOC_WM8961 if I2C
 	select SND_SOC_WM8962 if I2C
 	select SND_SOC_WM8971 if I2C
-	select SND_SOC_WM8974 if I2C
+	select SND_SOC_WM8974 if SND_SOC_I2C_AND_SPI
 	select SND_SOC_WM8978 if I2C
 	select SND_SOC_WM8983 if SND_SOC_I2C_AND_SPI
 	select SND_SOC_WM8985 if SND_SOC_I2C_AND_SPI

@@ -17,6 +17,7 @@
 #include <linux/delay.h>
 #include <linux/pm.h>
 #include <linux/i2c.h>
+#include <linux/spi/spi.h>
 #include <linux/slab.h>
 #include <sound/core.h>
 #include <sound/pcm.h>

@@ -48,6 +49,10 @@ static const u16 wm8974_reg[WM8974_CACHEREGNUM] = {
 #define WM8974_POWER1_BIASEN  0x08
 #define WM8974_POWER1_BUFIOEN 0x04
 
+struct wm8974_priv {
+	enum snd_soc_control_type control_type;
+};
+
 #define wm8974_reset(c)	snd_soc_write(c, WM8974_RESET, 0)
 
 static const char *wm8974_companding[] = {"Off", "NC", "u-law", "A-law" };

@@ -617,8 +622,9 @@ static int wm8974_resume(struct snd_soc_codec *codec)
 static int wm8974_probe(struct snd_soc_codec *codec)
 {
 	int ret = 0;
+	struct wm8974_priv *wm8974 = snd_soc_codec_get_drvdata(codec);
 
-	ret = snd_soc_codec_set_cache_io(codec, 7, 9, SND_SOC_I2C);
+	ret = snd_soc_codec_set_cache_io(codec, 7, 9, wm8974->control_type);
 	if (ret < 0) {
 		dev_err(codec->dev, "Failed to set cache I/O: %d\n", ret);
 		return ret;

@@ -660,13 +666,64 @@ static struct snd_soc_codec_driver soc_codec_dev_wm8974 = {
 	.num_dapm_routes = ARRAY_SIZE(wm8974_dapm_routes),
 };
 
+#if defined(CONFIG_SPI_MASTER)
+static int __devinit wm8974_spi_probe(struct spi_device *spi)
+{
+	struct wm8974_priv *wm8974;
+	int ret;
+
+	wm8974 = kzalloc(sizeof(*wm8974), GFP_KERNEL);
+	if (!wm8974)
+		return -ENOMEM;
+
+	wm8974->control_type = SND_SOC_SPI;
+	spi_set_drvdata(spi, wm8974);
+
+	ret = snd_soc_register_codec(&spi->dev,
+			&soc_codec_dev_wm8974, &wm8974_dai, 1);
+	if (ret)
+		kfree(wm8974);
+
+	return ret;
+}
+
+static int __devexit wm8974_spi_remove(struct spi_device *spi)
+{
+	snd_soc_unregister_codec(&spi->dev);
+	kfree(spi_get_drvdata(spi));
+	return 0;
+}
+
+static struct spi_driver wm8974_spi_driver = {
+	.driver = {
+		.name = "wm8974",
+		.owner = THIS_MODULE,
+	},
+	.probe = wm8974_spi_probe,
+	.remove = __devexit_p(wm8974_spi_remove),
+};
+
+module_spi_driver(wm8974_spi_driver);
+#endif
+
+#if IS_ENABLED(CONFIG_I2C)
 static __devinit int wm8974_i2c_probe(struct i2c_client *i2c,
 				      const struct i2c_device_id *id)
 {
+	struct wm8974_priv *wm8974;
 	int ret;
 
+	wm8974 = kzalloc(sizeof(*wm8974), GFP_KERNEL);
+	if (!wm8974)
+		return -ENOMEM;
+
+	wm8974->control_type = SND_SOC_I2C;
+	i2c_set_clientdata(i2c, wm8974);
+
 	ret = snd_soc_register_codec(&i2c->dev,
 			&soc_codec_dev_wm8974, &wm8974_dai, 1);
+	if (ret)
+		kfree(wm8974);
 
 	return ret;
 }

@@ -674,7 +731,7 @@ static __devinit int wm8974_i2c_probe(struct i2c_client *i2c,
 static __devexit int wm8974_i2c_remove(struct i2c_client *client)
 {
 	snd_soc_unregister_codec(&client->dev);
-
+	kfree(i2c_get_clientdata(client));
 	return 0;
 }
 

@@ -695,6 +752,7 @@ static struct i2c_driver wm8974_i2c_driver = {
 };
 
 module_i2c_driver(wm8974_i2c_driver);
+#endif
 
 MODULE_DESCRIPTION("ASoC WM8974 driver");
 MODULE_AUTHOR("Liam Girdwood");