ASoC: ad1836: use soc-cache framework for codec registers access

Signed-off-by: Barry Song <Barry.Song@analog.com>
Acked-by: Liam Girdwood <lrg@slimlogic.co.uk>
Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>

1 files changed, 67 insertions, 0 deletions

diff --git a/sound/soc/soc-cache.c b/sound/soc/soc-cache.c
index 02c235711bb8..cde7b63de113 100644
--- a/sound/soc/soc-cache.c
+++ b/sound/soc/soc-cache.c
@@ -15,6 +15,68 @@
 #include <linux/spi/spi.h>
 #include <sound/soc.h>
 
+static unsigned int snd_soc_4_12_read(struct snd_soc_codec *codec,
+                                     unsigned int reg)
+{
+        u16 *cache = codec->reg_cache;
+        if (reg >= codec->reg_cache_size)
+                return -1;
+        return cache[reg];
+}
+
+static int snd_soc_4_12_write(struct snd_soc_codec *codec, unsigned int reg,
+                             unsigned int value)
+{
+        u16 *cache = codec->reg_cache;
+        u8 data[2];
+        int ret;
+
+        BUG_ON(codec->volatile_register);
+
+        data[0] = (reg << 4) | ((value >> 8) & 0x000f);
+        data[1] = value & 0x00ff;
+
+        if (reg < codec->reg_cache_size)
+                cache[reg] = value;
+        ret = codec->hw_write(codec->control_data, data, 2);
+        if (ret == 2)
+                return 0;
+        if (ret < 0)
+                return ret;
+        else
+                return -EIO;
+}
+
+#if defined(CONFIG_SPI_MASTER)
+static int snd_soc_4_12_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[1];
+        msg[1] = data[0];
+
+        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_4_12_spi_write NULL
+#endif
+
 static unsigned int snd_soc_7_9_read(struct snd_soc_codec *codec,
                                      unsigned int reg)
 {
@@ -180,6 +242,11 @@ static struct {
         unsigned int (*i2c_read)(struct snd_soc_codec *, unsigned int);
 } io_types[] = {
         {
+                .addr_bits = 4, .data_bits = 12,
+                .write = snd_soc_4_12_write, .read = snd_soc_4_12_read,
+                .spi_write = snd_soc_4_12_spi_write,
+        },
+        {
                 .addr_bits = 7, .data_bits = 9,
                 .write = snd_soc_7_9_write, .read = snd_soc_7_9_read,
                 .spi_write = snd_soc_7_9_spi_write,