ASoC: TWL4030: Helper to check chip default registers

Since the twl4030 codec driver supports different version
of the PM chip, a helper function can come handy, which
can check the driver's default versus the chip values.

Signed-off-by: Peter Ujfalusi <peter.ujfalusi@nokia.com>
Acked-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
Signed-off-by: Liam Girdwood <lrg@slimlogic.co.uk>

sound/soc/codecs/twl4030.c

@@ -243,6 +243,25 @@ static void twl4030_codec_enable(struct snd_soc_codec *codec, int enable)
 	udelay(10);
 }
 
+static inline void twl4030_check_defaults(struct snd_soc_codec *codec)
+{
+	int i, difference = 0;
+	u8 val;
+
+	dev_dbg(codec->dev, "Checking TWL audio default configuration\n");
+	for (i = 1; i <= TWL4030_REG_MISC_SET_2; i++) {
+		twl_i2c_read_u8(TWL4030_MODULE_AUDIO_VOICE, &val, i);
+		if (val != twl4030_reg[i]) {
+			difference++;
+			dev_dbg(codec->dev,
+				 "Reg 0x%02x: chip: 0x%02x driver: 0x%02x\n",
+				 i, val, twl4030_reg[i]);
+		}
+	}
+	dev_dbg(codec->dev, "Found %d non maching registers. %s\n",
+		 difference, difference ? "Not OK" : "OK");
+}
+
 static void twl4030_init_chip(struct platform_device *pdev)
 {
 	struct snd_soc_device *socdev = platform_get_drvdata(pdev);
@@ -252,8 +271,12 @@ static void twl4030_init_chip(struct platform_device *pdev)
 	u8 reg, byte;
 	int i = 0;
 
+	/* Check defaults, if instructed before anything else */
+	if (setup && setup->check_defaults)
+		twl4030_check_defaults(codec);
+
 	/* Refresh APLL_CTL register from HW */
-	twl4030_i2c_read_u8(TWL4030_MODULE_AUDIO_VOICE, &byte,
+	twl_i2c_read_u8(TWL4030_MODULE_AUDIO_VOICE, &byte,
 			    TWL4030_REG_APLL_CTL);
 	twl4030_write_reg_cache(codec, TWL4030_REG_APLL_CTL, byte);