ASoC: Factor out 7 bit register 9 bit data SPI write

This converts all the Wolfson drivers using this format (the only devices
that do) except WM8753 to use it.

Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>

1 files changed, 36 insertions, 3 deletions

diff --git a/sound/soc/soc-cache.c b/sound/soc/soc-cache.c
index ab058b811633..56ec3f22bf1c 100644
--- a/sound/soc/soc-cache.c
+++ b/sound/soc/soc-cache.c
@@ -12,6 +12,7 @@
  */
 
 #include <linux/i2c.h>
+#include <linux/spi/spi.h>
 #include <sound/soc.h>
 
 static unsigned int snd_soc_7_9_read(struct snd_soc_codec *codec,
@@ -46,6 +47,36 @@ static int snd_soc_7_9_write(struct snd_soc_codec *codec, unsigned int reg,
                 return -EIO;
 }
 
+#if defined(CONFIG_SPI_MASTER)
+static int snd_soc_7_9_spi_write(void *control_data, const char *data,
+                                 int len)
+{
+        struct spi_device *spi = control_data;
+        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;
+}
+#else
+#define snd_soc_7_9_spi_write NULL
+#endif
+
 static int snd_soc_8_16_write(struct snd_soc_codec *codec, unsigned int reg,
                               unsigned int value)
 {
@@ -115,12 +146,12 @@ static struct {
         int addr_bits;
         int data_bits;
         int (*write)(struct snd_soc_codec *codec, unsigned int, unsigned int);
+        int (*spi_write)(void *, const char *, int);
         unsigned int (*read)(struct snd_soc_codec *, unsigned int);
         unsigned int (*i2c_read)(struct snd_soc_codec *, unsigned int);
 } io_types[] = {
-        { 7, 9, snd_soc_7_9_write, snd_soc_7_9_read },
-        { 8, 16,
-          snd_soc_8_16_write, snd_soc_8_16_read,
+        { 7, 9, snd_soc_7_9_write, snd_soc_7_9_spi_write, snd_soc_7_9_read },
+        { 8, 16, snd_soc_8_16_write, NULL, snd_soc_8_16_read,
           snd_soc_8_16_read_i2c },
 };
 
@@ -177,6 +208,8 @@ int snd_soc_codec_set_cache_io(struct snd_soc_codec *codec,
                 break;
 
         case SND_SOC_SPI:
+                if (io_types[i].spi_write)
+                        codec->hw_write = io_types[i].spi_write;
                 break;
         }