ASoC: TWL4030: Add shadow register

Shadow, non HW register for dealing with the HandsfreeL/R
muting.

Signed-off-by: Peter Ujfalusi <peter.ujfalusi@nokia.com>
Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>

1 files changed, 6 insertions, 1 deletions

diff --git a/sound/soc/codecs/twl4030.c b/sound/soc/codecs/twl4030.c
index 17ddcb26513..989446dabcd 100644
--- a/sound/soc/codecs/twl4030.c
+++ b/sound/soc/codecs/twl4030.c
@@ -115,6 +115,7 @@ static const u8 twl4030_reg[TWL4030_CACHEREGNUM] = {
         0x00, /* REG_VIBRA_PWM_SET      (0x47)  */
         0x00, /* REG_ANAMIC_GAIN        (0x48)  */
         0x00, /* REG_MISC_SET_2         (0x49)  */
+        0x00, /* REG_SW_SHADOW          (0x4A)  - Shadow, non HW register */
 };
 
 /* codec private data */
@@ -172,7 +173,11 @@ static int twl4030_write(struct snd_soc_codec *codec,
                         unsigned int reg, unsigned int value)
 {
         twl4030_write_reg_cache(codec, reg, value);
-        return twl4030_i2c_write_u8(TWL4030_MODULE_AUDIO_VOICE, value, reg);
+        if (likely(reg < TWL4030_REG_SW_SHADOW))
+                return twl4030_i2c_write_u8(TWL4030_MODULE_AUDIO_VOICE, value,
+                                            reg);
+        else
+                return 0;
 }
 
 static void twl4030_codec_enable(struct snd_soc_codec *codec, int enable)