ASoC: codecs: adau1701: factor out firmware reset

Some runtime-determined constraints might need to be satisfied prior to
firmware loading, so the actual download and releasing the device from
reset has to be postponed. Factor it out first, so we have everything at
one place.

This also changes the behaviour in a way that adau1701_i2c_probe() will
assert the reset line, and wait for the codec probe to release it.

Signed-off-by: Daniel Mack <zonque@gmail.com>
Acked-by: Lars-Peter Clausen <lars@metafoo.de>
Signed-off-by: Mark Brown <broonie@linaro.org>

sound/soc/codecs/adau1701.c

@@ -90,6 +90,7 @@
 #define ADAU1701_FIRMWARE "adau1701.bin"
 
 struct adau1701 {
+	int gpio_nreset;
 	unsigned int dai_fmt;
 };
 
@@ -183,9 +184,37 @@ static unsigned int adau1701_read(struct snd_soc_codec *codec, unsigned int reg)
 	return value;
 }
 
-static int adau1701_load_firmware(struct i2c_client *client)
+static void adau1701_reset(struct snd_soc_codec *codec)
 {
-	return process_sigma_firmware(client, ADAU1701_FIRMWARE);
+	struct adau1701 *adau1701 = snd_soc_codec_get_drvdata(codec);
+
+	if (!gpio_is_valid(adau1701->gpio_nreset))
+		return;
+
+	gpio_set_value(adau1701->gpio_nreset, 0);
+	/* minimum reset time is 20ns */
+	udelay(1);
+	gpio_set_value(adau1701->gpio_nreset, 1);
+	/* power-up time may be as long as 85ms */
+	mdelay(85);
+}
+
+static int adau1701_init(struct snd_soc_codec *codec)
+{
+	int ret;
+	struct i2c_client *client = to_i2c_client(codec->dev);
+
+	adau1701_reset(codec);
+
+	ret = process_sigma_firmware(client, ADAU1701_FIRMWARE);
+	if (ret) {
+		dev_warn(codec->dev, "Failed to load firmware\n");
+		return ret;
+	}
+
+	snd_soc_write(codec, ADAU1701_DACSET, ADAU1701_DACSET_DACINIT);
+
+	return 0;
 }
 
 static int adau1701_set_capture_pcm_format(struct snd_soc_codec *codec,
@@ -466,15 +495,13 @@ MODULE_DEVICE_TABLE(of, adau1701_dt_ids);
 static int adau1701_probe(struct snd_soc_codec *codec)
 {
 	int ret;
-	struct i2c_client *client = to_i2c_client(codec->dev);
 
-	codec->control_data = client;
+	codec->control_data = to_i2c_client(codec->dev);
 
-	ret = adau1701_load_firmware(client);
+	ret = adau1701_init(codec);
 	if (ret)
-		dev_warn(codec->dev, "Failed to load firmware\n");
+		return ret;
 
-	snd_soc_write(codec, ADAU1701_DACSET, ADAU1701_DACSET_DACINIT);
 	snd_soc_write(codec, ADAU1701_DSPCTRL, ADAU1701_DSPCTRL_CR);
 
 	return 0;
@@ -524,14 +551,10 @@ static int adau1701_i2c_probe(struct i2c_client *client,
 					    "ADAU1701 Reset");
 		if (ret < 0)
 			return ret;
-
-		/* minimum reset time is 20ns */
-		udelay(1);
-		gpio_set_value(gpio_nreset, 1);
-		/* power-up time may be as long as 85ms */
-		mdelay(85);
 	}
 
+	adau1701->gpio_nreset = gpio_nreset;
+
 	i2c_set_clientdata(client, adau1701);
 	ret = snd_soc_register_codec(&client->dev, &adau1701_codec_drv,
 			&adau1701_dai, 1);