ASoC: Begin to factor out register cache I/O functions

A lot of CODECs share the same register data formats and therefore
replicate the code to manage access to and caching of the register
map. In order to reduce code duplication centralised versions of
this code will be introduced with drivers able to configure the use
of the common code by calling the new snd_soc_codec_set_cache_io()
API call during startup.

As an initial user the 7 bit address/9 bit data format used by many
Wolfson devices is supported for write only CODECs and the drivers
with straightforward register cache implementations are converted to
use it.

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

1 files changed, 43 insertions, 78 deletions

diff --git a/sound/soc/codecs/wm8750.c b/sound/soc/codecs/wm8750.c
index b64509b01a49..ed09043181e1 100644
--- a/sound/soc/codecs/wm8750.c
+++ b/sound/soc/codecs/wm8750.c
@@ -55,50 +55,7 @@ static const u16 wm8750_reg[] = {
         0x0079, 0x0079, 0x0079,          /* 40 */
 };
 
-/*
- * read wm8750 register cache
- */
-static inline unsigned int wm8750_read_reg_cache(struct snd_soc_codec *codec,
-        unsigned int reg)
-{
-        u16 *cache = codec->reg_cache;
-        if (reg > WM8750_CACHE_REGNUM)
-                return -1;
-        return cache[reg];
-}
-
-/*
- * write wm8750 register cache
- */
-static inline void wm8750_write_reg_cache(struct snd_soc_codec *codec,
-        unsigned int reg, unsigned int value)
-{
-        u16 *cache = codec->reg_cache;
-        if (reg > WM8750_CACHE_REGNUM)
-                return;
-        cache[reg] = value;
-}
-
-static int wm8750_write(struct snd_soc_codec *codec, unsigned int reg,
-        unsigned int value)
-{
-        u8 data[2];
-
-        /* data is
-         *   D15..D9 WM8753 register offset
-         *   D8...D0 register data
-         */
-        data[0] = (reg << 1) | ((value >> 8) & 0x0001);
-        data[1] = value & 0x00ff;
-
-        wm8750_write_reg_cache(codec, reg, value);
-        if (codec->hw_write(codec->control_data, data, 2) == 2)
-                return 0;
-        else
-                return -EIO;
-}
-
-#define wm8750_reset(c) wm8750_write(c, WM8750_RESET, 0)
+#define wm8750_reset(c) snd_soc_write(c, WM8750_RESET, 0)
 
 /*
  * WM8750 Controls
@@ -594,7 +551,7 @@ static int wm8750_set_dai_fmt(struct snd_soc_dai *codec_dai,
                 return -EINVAL;
         }
 
-        wm8750_write(codec, WM8750_IFACE, iface);
+        snd_soc_write(codec, WM8750_IFACE, iface);
         return 0;
 }
 
@@ -606,8 +563,8 @@ static int wm8750_pcm_hw_params(struct snd_pcm_substream *substream,
         struct snd_soc_device *socdev = rtd->socdev;
         struct snd_soc_codec *codec = socdev->card->codec;
         struct wm8750_priv *wm8750 = codec->private_data;
-        u16 iface = wm8750_read_reg_cache(codec, WM8750_IFACE) & 0x1f3;
-        u16 srate = wm8750_read_reg_cache(codec, WM8750_SRATE) & 0x1c0;
+        u16 iface = snd_soc_read(codec, WM8750_IFACE) & 0x1f3;
+        u16 srate = snd_soc_read(codec, WM8750_SRATE) & 0x1c0;
         int coeff = get_coeff(wm8750->sysclk, params_rate(params));
 
         /* bit size */
@@ -626,9 +583,9 @@ static int wm8750_pcm_hw_params(struct snd_pcm_substream *substream,
         }
 
         /* set iface & srate */
-        wm8750_write(codec, WM8750_IFACE, iface);
+        snd_soc_write(codec, WM8750_IFACE, iface);
         if (coeff >= 0)
-                wm8750_write(codec, WM8750_SRATE, srate |
+                snd_soc_write(codec, WM8750_SRATE, srate |
                         (coeff_div[coeff].sr << 1) | coeff_div[coeff].usb);
 
         return 0;
@@ -637,35 +594,35 @@ static int wm8750_pcm_hw_params(struct snd_pcm_substream *substream,
 static int wm8750_mute(struct snd_soc_dai *dai, int mute)
 {
         struct snd_soc_codec *codec = dai->codec;
-        u16 mute_reg = wm8750_read_reg_cache(codec, WM8750_ADCDAC) & 0xfff7;
+        u16 mute_reg = snd_soc_read(codec, WM8750_ADCDAC) & 0xfff7;
 
         if (mute)
-                wm8750_write(codec, WM8750_ADCDAC, mute_reg | 0x8);
+                snd_soc_write(codec, WM8750_ADCDAC, mute_reg | 0x8);
         else
-                wm8750_write(codec, WM8750_ADCDAC, mute_reg);
+                snd_soc_write(codec, WM8750_ADCDAC, mute_reg);
         return 0;
 }
 
 static int wm8750_set_bias_level(struct snd_soc_codec *codec,
                                  enum snd_soc_bias_level level)
 {
-        u16 pwr_reg = wm8750_read_reg_cache(codec, WM8750_PWR1) & 0xfe3e;
+        u16 pwr_reg = snd_soc_read(codec, WM8750_PWR1) & 0xfe3e;
 
         switch (level) {
         case SND_SOC_BIAS_ON:
                 /* set vmid to 50k and unmute dac */
-                wm8750_write(codec, WM8750_PWR1, pwr_reg | 0x00c0);
+                snd_soc_write(codec, WM8750_PWR1, pwr_reg | 0x00c0);
                 break;
         case SND_SOC_BIAS_PREPARE:
                 /* set vmid to 5k for quick power up */
-                wm8750_write(codec, WM8750_PWR1, pwr_reg | 0x01c1);
+                snd_soc_write(codec, WM8750_PWR1, pwr_reg | 0x01c1);
                 break;
         case SND_SOC_BIAS_STANDBY:
                 /* mute dac and set vmid to 500k, enable VREF */
-                wm8750_write(codec, WM8750_PWR1, pwr_reg | 0x0141);
+                snd_soc_write(codec, WM8750_PWR1, pwr_reg | 0x0141);
                 break;
         case SND_SOC_BIAS_OFF:
-                wm8750_write(codec, WM8750_PWR1, 0x0001);
+                snd_soc_write(codec, WM8750_PWR1, 0x0001);
                 break;
         }
         codec->bias_level = level;
@@ -761,8 +718,6 @@ static int wm8750_init(struct snd_soc_device *socdev)
 
         codec->name = "WM8750";
         codec->owner = THIS_MODULE;
-        codec->read = wm8750_read_reg_cache;
-        codec->write = wm8750_write;
         codec->set_bias_level = wm8750_set_bias_level;
         codec->dai = &wm8750_dai;
         codec->num_dai = 1;
@@ -771,13 +726,23 @@ static int wm8750_init(struct snd_soc_device *socdev)
         if (codec->reg_cache == NULL)
                 return -ENOMEM;
 
-        wm8750_reset(codec);
+        ret = snd_soc_codec_set_cache_io(codec, 7, 9);
+        if (ret < 0) {
+                printk(KERN_ERR "wm8750: failed to set cache I/O: %d\n", ret);
+                goto err;
+        }
+
+        ret = wm8750_reset(codec);
+        if (ret < 0) {
+                printk(KERN_ERR "wm8750: failed to reset: %d\n", ret);
+                goto err;
+        }
 
         /* register pcms */
         ret = snd_soc_new_pcms(socdev, SNDRV_DEFAULT_IDX1, SNDRV_DEFAULT_STR1);
         if (ret < 0) {
                 printk(KERN_ERR "wm8750: failed to create pcms\n");
-                goto pcm_err;
+                goto err;
         }
 
         /* charge output caps */
@@ -786,22 +751,22 @@ static int wm8750_init(struct snd_soc_device *socdev)
         schedule_delayed_work(&codec->delayed_work, msecs_to_jiffies(1000));
 
         /* set the update bits */
-        reg = wm8750_read_reg_cache(codec, WM8750_LDAC);
-        wm8750_write(codec, WM8750_LDAC, reg | 0x0100);
-        reg = wm8750_read_reg_cache(codec, WM8750_RDAC);
-        wm8750_write(codec, WM8750_RDAC, reg | 0x0100);
-        reg = wm8750_read_reg_cache(codec, WM8750_LOUT1V);
-        wm8750_write(codec, WM8750_LOUT1V, reg | 0x0100);
-        reg = wm8750_read_reg_cache(codec, WM8750_ROUT1V);
-        wm8750_write(codec, WM8750_ROUT1V, reg | 0x0100);
-        reg = wm8750_read_reg_cache(codec, WM8750_LOUT2V);
-        wm8750_write(codec, WM8750_LOUT2V, reg | 0x0100);
-        reg = wm8750_read_reg_cache(codec, WM8750_ROUT2V);
-        wm8750_write(codec, WM8750_ROUT2V, reg | 0x0100);
-        reg = wm8750_read_reg_cache(codec, WM8750_LINVOL);
-        wm8750_write(codec, WM8750_LINVOL, reg | 0x0100);
-        reg = wm8750_read_reg_cache(codec, WM8750_RINVOL);
-        wm8750_write(codec, WM8750_RINVOL, reg | 0x0100);
+        reg = snd_soc_read(codec, WM8750_LDAC);
+        snd_soc_write(codec, WM8750_LDAC, reg | 0x0100);
+        reg = snd_soc_read(codec, WM8750_RDAC);
+        snd_soc_write(codec, WM8750_RDAC, reg | 0x0100);
+        reg = snd_soc_read(codec, WM8750_LOUT1V);
+        snd_soc_write(codec, WM8750_LOUT1V, reg | 0x0100);
+        reg = snd_soc_read(codec, WM8750_ROUT1V);
+        snd_soc_write(codec, WM8750_ROUT1V, reg | 0x0100);
+        reg = snd_soc_read(codec, WM8750_LOUT2V);
+        snd_soc_write(codec, WM8750_LOUT2V, reg | 0x0100);
+        reg = snd_soc_read(codec, WM8750_ROUT2V);
+        snd_soc_write(codec, WM8750_ROUT2V, reg | 0x0100);
+        reg = snd_soc_read(codec, WM8750_LINVOL);
+        snd_soc_write(codec, WM8750_LINVOL, reg | 0x0100);
+        reg = snd_soc_read(codec, WM8750_RINVOL);
+        snd_soc_write(codec, WM8750_RINVOL, reg | 0x0100);
 
         snd_soc_add_controls(codec, wm8750_snd_controls,
                                 ARRAY_SIZE(wm8750_snd_controls));
@@ -816,7 +781,7 @@ static int wm8750_init(struct snd_soc_device *socdev)
 card_err:
         snd_soc_free_pcms(socdev);
         snd_soc_dapm_free(socdev);
-pcm_err:
+err:
         kfree(codec->reg_cache);
         return ret;
 }