ASoC: wm8940: Convert to snd_soc_cache_sync

Convert to snd_soc_cache_sync for sync reg_cache with the hardware.

Signed-off-by: Axel Lin <axel.lin@gmail.com>
Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>

diff --git a/sound/soc/codecs/wm8940.c b/sound/soc/codecs/wm8940.c
index 7e0f54c..a4abfdf 100644 (file)
--- a/sound/soc/codecs/wm8940.c
+++ b/sound/soc/codecs/wm8940.c
@@ -45,6 +45,17 @@ struct wm8940_priv {
        enum snd_soc_control_type control_type;
 };
 
+static int wm8940_volatile_register(struct snd_soc_codec *codec,
+                                   unsigned int reg)
+{
+       switch (reg) {
+       case WM8940_SOFTRESET:
+               return 1;
+       default:
+               return 0;
+       }
+}
+
 static u16 wm8940_reg_defaults[] = {
        0x8940, /* Soft Reset */
        0x0000, /* Power 1 */
@@ -459,6 +470,14 @@ static int wm8940_set_bias_level(struct snd_soc_codec *codec,
                ret = snd_soc_write(codec, WM8940_POWER1, pwr_reg | 0x1);
                break;
        case SND_SOC_BIAS_STANDBY:
+               if (codec->dapm.bias_level == SND_SOC_BIAS_OFF) {
+                       ret = snd_soc_cache_sync(codec);
+                       if (ret < 0) {
+                               dev_err(codec->dev, "Failed to sync cache: %d\n", ret);
+                               return ret;
+                       }
+               }
+
                /* ensure bufioen and biasen */
                pwr_reg |= (1 << 2) | (1 << 3);
                /* set vmid to 300k for standby */
@@ -659,30 +678,8 @@ static int wm8940_suspend(struct snd_soc_codec *codec, pm_message_t state)
 
 static int wm8940_resume(struct snd_soc_codec *codec)
 {
-       int i;
-       int ret;
-       u8 data[3];
-       u16 *cache = codec->reg_cache;
-
-       /* Sync reg_cache with the hardware
-        * Could use auto incremented writes to speed this up
-        */
-       for (i = 0; i < ARRAY_SIZE(wm8940_reg_defaults); i++) {
-               data[0] = i;
-               data[1] = (cache[i] & 0xFF00) >> 8;
-               data[2] = cache[i] & 0x00FF;
-               ret = codec->hw_write(codec->control_data, data, 3);
-               if (ret < 0)
-                       goto error_ret;
-               else if (ret != 3) {
-                       ret = -EIO;
-                       goto error_ret;
-               }
-       }
-       ret = wm8940_set_bias_level(codec, SND_SOC_BIAS_STANDBY);
-
-error_ret:
-       return ret;
+       wm8940_set_bias_level(codec, SND_SOC_BIAS_STANDBY);
+       return 0;
 }
 
 static int wm8940_probe(struct snd_soc_codec *codec)
@@ -742,6 +739,7 @@ static struct snd_soc_codec_driver soc_codec_dev_wm8940 = {
        .reg_cache_size = ARRAY_SIZE(wm8940_reg_defaults),
        .reg_word_size = sizeof(u16),
        .reg_cache_default = wm8940_reg_defaults,
+       .volatile_register = wm8940_volatile_register,
 };
 
 #if defined(CONFIG_I2C) || defined(CONFIG_I2C_MODULE)