ASoC: Factor out I2C 8 bit address 8 bit data I/O

This patch is for the AK4671 codec driver using this format.

Signed-off-by: Joonyoung Shim <jy0922.shim@samsung.com>
Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>

1 files changed, 30 insertions, 0 deletions

diff --git a/sound/soc/soc-cache.c b/sound/soc/soc-cache.c
index c8ceddc2a26c..404231ee8780 100644
--- a/sound/soc/soc-cache.c
+++ b/sound/soc/soc-cache.c
@@ -77,6 +77,35 @@ static int snd_soc_7_9_spi_write(void *control_data, const char *data,
 #define snd_soc_7_9_spi_write NULL
 #endif
 
+static int snd_soc_8_8_write(struct snd_soc_codec *codec, unsigned int reg,
+                             unsigned int value)
+{
+        u8 *cache = codec->reg_cache;
+        u8 data[2];
+
+        BUG_ON(codec->volatile_register);
+
+        data[0] = reg & 0xff;
+        data[1] = value & 0xff;
+
+        if (reg < codec->reg_cache_size)
+                cache[reg] = value;
+
+        if (codec->hw_write(codec->control_data, data, 2) == 2)
+                return 0;
+        else
+                return -EIO;
+}
+
+static unsigned int snd_soc_8_8_read(struct snd_soc_codec *codec,
+                                     unsigned int reg)
+{
+        u8 *cache = codec->reg_cache;
+        if (reg >= codec->reg_cache_size)
+                return -1;
+        return cache[reg];
+}
+
 static int snd_soc_8_16_write(struct snd_soc_codec *codec, unsigned int reg,
                               unsigned int value)
 {
@@ -151,6 +180,7 @@ static struct {
         unsigned int (*i2c_read)(struct snd_soc_codec *, unsigned int);
 } io_types[] = {
         { 7, 9, snd_soc_7_9_write, snd_soc_7_9_spi_write, snd_soc_7_9_read },
+        { 8, 8, snd_soc_8_8_write, NULL, snd_soc_8_8_read, NULL },
         { 8, 16, snd_soc_8_16_write, NULL, snd_soc_8_16_read,
           snd_soc_8_16_read_i2c },
 };