ASoC: wm8961: Move device identification and reset to I2C probe

This is more idiomatic as it means we verify that the device is there
prior to trying to do the card probe.
Signed-off-by: NMark Brown <broonie@opensource.wolfsonmicro.com>

sound/soc/codecs/wm8961.c

@@ -187,11 +187,6 @@ static bool wm8961_readable(struct device *dev, unsigned int reg)
 	}
 }
 
-static int wm8961_reset(struct snd_soc_codec *codec)
-{
-	return snd_soc_write(codec, WM8961_SOFTWARE_RESET, 0);
-}
-
 /*
  * The headphone output supports special anti-pop sequences giving
  * silent power up and power down.
@@ -840,7 +835,6 @@ static struct snd_soc_dai_driver wm8961_dai = {
 
 static int wm8961_probe(struct snd_soc_codec *codec)
 {
-	struct wm8961_priv *wm8961 = snd_soc_codec_get_drvdata(codec);
 	struct snd_soc_dapm_context *dapm = &codec->dapm;
 	int ret = 0;
 	u16 reg;
@@ -851,27 +845,6 @@ static int wm8961_probe(struct snd_soc_codec *codec)
 		return ret;
 	}
 
-	reg = snd_soc_read(codec, WM8961_SOFTWARE_RESET);
-	if (reg != 0x1801) {
-		dev_err(codec->dev, "Device is not a WM8961: ID=0x%x\n", reg);
-		return -EINVAL;
-	}
-
-	/* This isn't volatile - readback doesn't correspond to write */
-	regcache_cache_bypass(wm8961->regmap, true);
-	reg = snd_soc_read(codec, WM8961_RIGHT_INPUT_VOLUME);
-	regcache_cache_bypass(wm8961->regmap, false);
-	dev_info(codec->dev, "WM8961 family %d revision %c\n",
-		 (reg & WM8961_DEVICE_ID_MASK) >> WM8961_DEVICE_ID_SHIFT,
-		 ((reg & WM8961_CHIP_REV_MASK) >> WM8961_CHIP_REV_SHIFT)
-		 + 'A');
-
-	ret = wm8961_reset(codec);
-	if (ret < 0) {
-		dev_err(codec->dev, "Failed to issue reset\n");
-		return ret;
-	}
-
 	/* Enable class W */
 	reg = snd_soc_read(codec, WM8961_CHARGE_PUMP_B);
 	reg |= WM8961_CP_DYN_PWR_MASK;
@@ -968,6 +941,7 @@ static __devinit int wm8961_i2c_probe(struct i2c_client *i2c,
 				      const struct i2c_device_id *id)
 {
 	struct wm8961_priv *wm8961;
+	unsigned int val;
 	int ret;
 
 	wm8961 = devm_kzalloc(&i2c->dev, sizeof(struct wm8961_priv),
@@ -979,6 +953,38 @@ static __devinit int wm8961_i2c_probe(struct i2c_client *i2c,
 	if (IS_ERR(wm8961->regmap))
 		return PTR_ERR(wm8961->regmap);
 
+	ret = regmap_read(wm8961->regmap, WM8961_SOFTWARE_RESET, &val);
+	if (ret != 0) {
+		dev_err(&i2c->dev, "Failed to read chip ID: %d\n", ret);
+		return ret;
+	}
+
+	if (val != 0x1801) {
+		dev_err(&i2c->dev, "Device is not a WM8961: ID=0x%x\n", val);
+		return -EINVAL;
+	}
+
+	/* This isn't volatile - readback doesn't correspond to write */
+	regcache_cache_bypass(wm8961->regmap, true);
+	ret = regmap_read(wm8961->regmap, WM8961_RIGHT_INPUT_VOLUME, &val);
+	regcache_cache_bypass(wm8961->regmap, false);
+
+	if (ret != 0) {
+		dev_err(&i2c->dev, "Failed to read chip revision: %d\n", ret);
+		return ret;
+	}
+
+	dev_info(&i2c->dev, "WM8961 family %d revision %c\n",
+		 (val & WM8961_DEVICE_ID_MASK) >> WM8961_DEVICE_ID_SHIFT,
+		 ((val & WM8961_CHIP_REV_MASK) >> WM8961_CHIP_REV_SHIFT)
+		 + 'A');
+
+	ret = regmap_write(wm8961->regmap, WM8961_SOFTWARE_RESET, 0x1801);
+	if (ret != 0) {
+		dev_err(&i2c->dev, "Failed to issue reset: %d\n", ret);
+		return ret;
+	}
+
 	i2c_set_clientdata(i2c, wm8961);
 
 	ret = snd_soc_register_codec(&i2c->dev,