ASoC: ak4104: Convert to direct regmap API usage

Since the cache is currently open coded this is more of a win than for
most devices.

Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
Acked-by: Daniel Mack <zonque@gmail.com>

1 files changed, 44 insertions, 75 deletions

diff --git a/sound/soc/codecs/ak4104.c b/sound/soc/codecs/ak4104.c
index 34a840c5d2b7..ceb96ecf5588 100644
--- a/sound/soc/codecs/ak4104.c
+++ b/sound/soc/codecs/ak4104.c
@@ -46,69 +46,15 @@
 #define DRV_NAME "ak4104-codec"
 
 struct ak4104_private {
-        enum snd_soc_control_type control_type;
-        void *control_data;
+        struct regmap *regmap;
 };
 
-static int ak4104_fill_cache(struct snd_soc_codec *codec)
-{
-        int i;
-        u8 *reg_cache = codec->reg_cache;
-        struct spi_device *spi = codec->control_data;
-
-        for (i = 0; i < codec->driver->reg_cache_size; i++) {
-                int ret = spi_w8r8(spi, i | AK4104_READ);
-                if (ret < 0) {
-                        dev_err(&spi->dev, "SPI write failure\n");
-                        return ret;
-                }
-
-                reg_cache[i] = ret;
-        }
-
-        return 0;
-}
-
-static unsigned int ak4104_read_reg_cache(struct snd_soc_codec *codec,
-                                          unsigned int reg)
-{
-        u8 *reg_cache = codec->reg_cache;
-
-        if (reg >= codec->driver->reg_cache_size)
-                return -EINVAL;
-
-        return reg_cache[reg];
-}
-
-static int ak4104_spi_write(struct snd_soc_codec *codec, unsigned int reg,
-                            unsigned int value)
-{
-        u8 *cache = codec->reg_cache;
-        struct spi_device *spi = codec->control_data;
-
-        if (reg >= codec->driver->reg_cache_size)
-                return -EINVAL;
-
-        /* only write to the hardware if value has changed */
-        if (cache[reg] != value) {
-                u8 tmp[2] = { (reg & AK4104_REG_MASK) | AK4104_WRITE, value };
-
-                if (spi_write(spi, tmp, sizeof(tmp))) {
-                        dev_err(&spi->dev, "SPI write failed\n");
-                        return -EIO;
-                }
-
-                cache[reg] = value;
-        }
-
-        return 0;
-}
-
 static int ak4104_set_dai_fmt(struct snd_soc_dai *codec_dai,
                               unsigned int format)
 {
         struct snd_soc_codec *codec = codec_dai->codec;
         int val = 0;
+        int ret;
 
         /* set DAI format */
         switch (format & SND_SOC_DAIFMT_FORMAT_MASK) {
@@ -192,23 +138,12 @@ static struct snd_soc_dai_driver ak4104_dai = {
 static int ak4104_probe(struct snd_soc_codec *codec)
 {
         struct ak4104_private *ak4104 = snd_soc_codec_get_drvdata(codec);
-        int ret, val;
-
-        codec->control_data = ak4104->control_data;
+        int ret;
 
-        /* read all regs and fill the cache */
-        ret = ak4104_fill_cache(codec);
-        if (ret < 0) {
-                dev_err(codec->dev, "failed to fill register cache\n");
+        codec->control_data = ak4104->regmap;
+        ret = snd_soc_codec_set_cache_io(codec, 8, 8, SND_SOC_REGMAP);
+        if (ret != 0)
                 return ret;
-        }
-
-        /* read the 'reserved' register - according to the datasheet, it
-         * should contain 0x5b. Not a good way to verify the presence of
-         * the device, but there is no hardware ID register. */
-        if (ak4104_read_reg_cache(codec, AK4104_REG_RESERVED) !=
-                                         AK4104_RESERVED_VAL)
-                return -ENODEV;
 
         /* set power-up and non-reset bits */
         ret = snd_soc_update_bits(codec, AK4104_REG_CONTROL1,
@@ -237,13 +172,23 @@ static int ak4104_remove(struct snd_soc_codec *codec)
 static struct snd_soc_codec_driver soc_codec_device_ak4104 = {
         .probe =        ak4104_probe,
         .remove =       ak4104_remove,
-        .reg_cache_size = AK4104_NUM_REGS,
-        .reg_word_size = sizeof(u8),
+};
+
+static const struct regmap_config ak4104_regmap = {
+        .reg_bits = 8,
+        .val_bits = 8,
+
+        .max_register = AK4104_NUM_REGS - 1,
+        .read_flag_mask = AK4104_READ,
+        .write_flag_mask = AK4104_WRITE,
+
+        .cache_type = REGCACHE_RBTREE,
 };
 
 static int ak4104_spi_probe(struct spi_device *spi)
 {
         struct ak4104_private *ak4104;
+        unsigned int val;
         int ret;
 
         spi->bits_per_word = 8;
@@ -257,17 +202,41 @@ static int ak4104_spi_probe(struct spi_device *spi)
         if (ak4104 == NULL)
                 return -ENOMEM;
 
-        ak4104->control_data = spi;
-        ak4104->control_type = SND_SOC_SPI;
+        ak4104->regmap = regmap_init_spi(spi, &ak4104_regmap);
+        if (IS_ERR(ak4104->regmap)) {
+                ret = PTR_ERR(ak4104->regmap);
+                return ret;
+        }
+
+        /* read the 'reserved' register - according to the datasheet, it
+         * should contain 0x5b. Not a good way to verify the presence of
+         * the device, but there is no hardware ID register. */
+        ret = regmap_read(ak4104->regmap, AK4104_REG_RESERVED, &val);
+        if (ret != 0)
+                goto err;
+        if (val != AK4104_RESERVED_VAL) {
+                ret = -ENODEV;
+                goto err;
+        }
+
         spi_set_drvdata(spi, ak4104);
 
         ret = snd_soc_register_codec(&spi->dev,
                         &soc_codec_device_ak4104, &ak4104_dai, 1);
+        if (ret != 0)
+                goto err;
+
+        return 0;
+
+err:
+        regmap_exit(ak4104->regmap);
         return ret;
 }
 
 static int __devexit ak4104_spi_remove(struct spi_device *spi)
 {
+        struct ak4104_private *ak4101 = spi_get_drvdata(spi);
+        regmap_exit(ak4101->regmap);
         snd_soc_unregister_codec(&spi->dev);
         return 0;
 }