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>

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)

sound/soc/codecs/twl4030.h

@@ -92,8 +92,9 @@
 #define TWL4030_REG_VIBRA_PWM_SET	0x47
 #define TWL4030_REG_ANAMIC_GAIN		0x48
 #define TWL4030_REG_MISC_SET_2		0x49
+#define TWL4030_REG_SW_SHADOW		0x4A
 
-#define TWL4030_CACHEREGNUM	(TWL4030_REG_MISC_SET_2 + 1)
+#define TWL4030_CACHEREGNUM	(TWL4030_REG_SW_SHADOW + 1)
 
 /* Bitfield Definitions */
 
@@ -260,6 +261,10 @@
 #define TWL4030_SMOOTH_ANAVOL_EN	0x02
 #define TWL4030_DIGMIC_LR_SWAP_EN	0x01
 
+/* TWL4030_REG_SW_SHADOW (0x4A) Fields */
+#define TWL4030_HFL_EN			0x01
+#define TWL4030_HFR_EN			0x02
+
 #define TWL4030_DAI_HIFI		0
 #define TWL4030_DAI_VOICE		1