ASoC: cs4270: use the built-in register cache support

Update the CS4270 driver to use ASoC's internal codec register cache feature.
This change allows ASoC to perform the low-level I2C operations necessary to
read the register cache.  Support is also added for initializing the register
cache with an array of known power-on default values.

The CS4270 driver was handling the register cache itself, but somwhere along
the conversion to multi-compaonent, this feature broke.

Signed-off-by: Timur Tabi <timur@freescale.com>
Acked-by: Liam Girdwood <lrg@slimlogic.co.uk>
Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>

1 files changed, 48 insertions, 113 deletions

diff --git a/sound/soc/codecs/cs4270.c b/sound/soc/codecs/cs4270.c
index 3a582caa6ef9..8b51245f2318 100644
--- a/sound/soc/codecs/cs4270.c
+++ b/sound/soc/codecs/cs4270.c
@@ -106,6 +106,21 @@
 #define CS4270_MUTE_DAC_A       0x01
 #define CS4270_MUTE_DAC_B       0x02
 
+/* Power-on default values for the registers
+ *
+ * This array contains the power-on default values of the registers, with the
+ * exception of the "CHIPID" register (01h).  The lower four bits of that
+ * register contain the hardware revision, so it is treated as volatile.
+ *
+ * Also note that on the CS4270, the first readable register is 1, but ASoC
+ * assumes the first register is 0.  Therfore, the array must have an entry for
+ * register 0, but we use cs4270_reg_is_readable() to tell ASoC that it can't
+ * be read.
+ */
+static const u8 cs4270_default_reg_cache[CS4270_LASTREG + 1] = {
+        0x00, 0x00, 0x00, 0x30, 0x00, 0x60, 0x20, 0x00, 0x00
+};
+
 static const char *supply_names[] = {
         "va", "vd", "vlc"
 };
@@ -178,6 +193,20 @@ static struct cs4270_mode_ratios cs4270_mode_ratios[] = {
 /* The number of MCLK/LRCK ratios supported by the CS4270 */
 #define NUM_MCLK_RATIOS         ARRAY_SIZE(cs4270_mode_ratios)
 
+static int cs4270_reg_is_readable(unsigned int reg)
+{
+        return (reg >= CS4270_FIRSTREG) && (reg <= CS4270_LASTREG);
+}
+
+static int cs4270_reg_is_volatile(unsigned int reg)
+{
+        /* Unreadable registers are considered volatile */
+        if ((reg < CS4270_FIRSTREG) || (reg > CS4270_LASTREG))
+                return 1;
+
+        return reg == CS4270_CHIPID;
+}
+
 /**
  * cs4270_set_dai_sysclk - determine the CS4270 samples rates.
  * @codec_dai: the codec DAI
@@ -263,97 +292,6 @@ static int cs4270_set_dai_fmt(struct snd_soc_dai *codec_dai,
 }
 
 /**
- * cs4270_fill_cache - pre-fill the CS4270 register cache.
- * @codec: the codec for this CS4270
- *
- * This function fills in the CS4270 register cache by reading the register
- * values from the hardware.
- *
- * This CS4270 registers are cached to avoid excessive I2C I/O operations.
- * After the initial read to pre-fill the cache, the CS4270 never updates
- * the register values, so we won't have a cache coherency problem.
- *
- * We use the auto-increment feature of the CS4270 to read all registers in
- * one shot.
- */
-static int cs4270_fill_cache(struct snd_soc_codec *codec)
-{
-        u8 *cache = codec->reg_cache;
-        struct i2c_client *i2c_client = codec->control_data;
-        s32 length;
-
-        length = i2c_smbus_read_i2c_block_data(i2c_client,
-                CS4270_FIRSTREG | CS4270_I2C_INCR, CS4270_NUMREGS, cache);
-
-        if (length != CS4270_NUMREGS) {
-                dev_err(codec->dev, "i2c read failure, addr=0x%x\n",
-                       i2c_client->addr);
-                return -EIO;
-        }
-
-        return 0;
-}
-
-/**
- * cs4270_read_reg_cache - read from the CS4270 register cache.
- * @codec: the codec for this CS4270
- * @reg: the register to read
- *
- * This function returns the value for a given register.  It reads only from
- * the register cache, not the hardware itself.
- *
- * This CS4270 registers are cached to avoid excessive I2C I/O operations.
- * After the initial read to pre-fill the cache, the CS4270 never updates
- * the register values, so we won't have a cache coherency problem.
- */
-static unsigned int cs4270_read_reg_cache(struct snd_soc_codec *codec,
-        unsigned int reg)
-{
-        u8 *cache = codec->reg_cache;
-
-        if ((reg < CS4270_FIRSTREG) || (reg > CS4270_LASTREG))
-                return -EIO;
-
-        return cache[reg - CS4270_FIRSTREG];
-}
-
-/**
- * cs4270_i2c_write - write to a CS4270 register via the I2C bus.
- * @codec: the codec for this CS4270
- * @reg: the register to write
- * @value: the value to write to the register
- *
- * This function writes the given value to the given CS4270 register, and
- * also updates the register cache.
- *
- * Note that we don't use the hw_write function pointer of snd_soc_codec.
- * That's because it's too clunky: the hw_write_t prototype does not match
- * i2c_smbus_write_byte_data(), and it's just another layer of overhead.
- */
-static int cs4270_i2c_write(struct snd_soc_codec *codec, unsigned int reg,
-                            unsigned int value)
-{
-        u8 *cache = codec->reg_cache;
-
-        if ((reg < CS4270_FIRSTREG) || (reg > CS4270_LASTREG))
-                return -EIO;
-
-        /* Only perform an I2C operation if the new value is different */
-        if (cache[reg - CS4270_FIRSTREG] != value) {
-                struct i2c_client *client = codec->control_data;
-                if (i2c_smbus_write_byte_data(client, reg, value)) {
-                        dev_err(codec->dev, "i2c write failed\n");
-                        return -EIO;
-                }
-
-                /* We've written to the hardware, so update the cache */
-                cache[reg - CS4270_FIRSTREG] = value;
-        }
-
-        return 0;
-}
-
-/**
  * cs4270_hw_params - program the CS4270 with the given hardware parameters.
  * @substream: the audio stream
  * @params: the hardware parameters to set
@@ -550,15 +488,16 @@ static struct snd_soc_dai_driver cs4270_dai = {
 static int cs4270_probe(struct snd_soc_codec *codec)
 {
         struct cs4270_private *cs4270 = snd_soc_codec_get_drvdata(codec);
-        int i, ret, reg;
+        int i, ret;
 
         codec->control_data = cs4270->control_data;
 
-        /* The I2C interface is set up, so pre-fill our register cache */
-
-        ret = cs4270_fill_cache(codec);
+        /* Tell ASoC what kind of I/O to use to read the registers.  ASoC will
+         * then do the I2C transactions itself.
+         */
+        ret = snd_soc_codec_set_cache_io(codec, 8, 8, cs4270->control_type);
         if (ret < 0) {
-                dev_err(codec->dev, "failed to fill register cache\n");
+                dev_err(codec->dev, "failed to set cache I/O (ret=%i)\n", ret);
                 return ret;
         }
 
@@ -567,10 +506,7 @@ static int cs4270_probe(struct snd_soc_codec *codec)
          * this feature disabled by default.  An application (e.g. alsactl) can
          * re-enabled it by using the controls.
          */
-
-        reg = cs4270_read_reg_cache(codec, CS4270_MUTE);
-        reg &= ~CS4270_MUTE_AUTO;
-        ret = cs4270_i2c_write(codec, CS4270_MUTE, reg);
+        ret = snd_soc_update_bits(codec, CS4270_MUTE, CS4270_MUTE_AUTO, 0);
         if (ret < 0) {
                 dev_err(codec->dev, "i2c write failed\n");
                 return ret;
@@ -581,10 +517,8 @@ static int cs4270_probe(struct snd_soc_codec *codec)
          * playback has started.  An application (e.g. alsactl) can
          * re-enabled it by using the controls.
          */
-
-        reg = cs4270_read_reg_cache(codec, CS4270_TRANS);
-        reg &= ~(CS4270_TRANS_SOFT | CS4270_TRANS_ZERO);
-        ret = cs4270_i2c_write(codec, CS4270_TRANS, reg);
+        ret = snd_soc_update_bits(codec, CS4270_TRANS,
+                CS4270_TRANS_SOFT | CS4270_TRANS_ZERO, 0);
         if (ret < 0) {
                 dev_err(codec->dev, "i2c write failed\n");
                 return ret;
@@ -707,15 +641,16 @@ static int cs4270_soc_resume(struct snd_soc_codec *codec)
  * Assign this variable to the codec_dev field of the machine driver's
  * snd_soc_device structure.
  */
-static struct snd_soc_codec_driver soc_codec_device_cs4270 = {
-        .probe =        cs4270_probe,
-        .remove =       cs4270_remove,
-        .suspend =      cs4270_soc_suspend,
-        .resume =       cs4270_soc_resume,
-        .read = cs4270_read_reg_cache,
-        .write = cs4270_i2c_write,
-        .reg_cache_size = CS4270_NUMREGS,
-        .reg_word_size = sizeof(u8),
+static const struct snd_soc_codec_driver soc_codec_device_cs4270 = {
+        .probe =                cs4270_probe,
+        .remove =               cs4270_remove,
+        .suspend =              cs4270_soc_suspend,
+        .resume =               cs4270_soc_resume,
+        .volatile_register =    cs4270_reg_is_volatile,
+        .readable_register =    cs4270_reg_is_readable,
+        .reg_cache_size =       CS4270_LASTREG + 1,
+        .reg_word_size =        sizeof(u8),
+        .reg_cache_default =    cs4270_default_reg_cache,
 };
 
 /**