ALSA: ASoC: Convert ak4535 to a new-style i2c driver

Convert the ak4535 codec driver to the new (standard) device driver
binding model. After this change, AK4535 devices are no longer
discovered automatically and must instead be instantiated explicitly.
Signed-off-by: Jean Delvare <khali@linux-fr.org>
Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
Signed-off-by: Takashi Iwai <tiwai@suse.de>
Signed-off-by: Jaroslav Kysela <perex@perex.cz>

sound/soc/codecs/ak4535.c

@@ -535,87 +535,85 @@ static struct snd_soc_device *ak4535_socdev;
 
 #if defined(CONFIG_I2C) || defined(CONFIG_I2C_MODULE)
 
-#define I2C_DRIVERID_AK4535 0xfefe /* liam -  need a proper id */
-
-static unsigned short normal_i2c[] = { 0, I2C_CLIENT_END };
-
-/* Magic definition of all other variables and things */
-I2C_CLIENT_INSMOD;
-
-static struct i2c_driver ak4535_i2c_driver;
-static struct i2c_client client_template;
-
-/* If the i2c layer weren't so broken, we could pass this kind of data
-   around */
-static int ak4535_codec_probe(struct i2c_adapter *adap, int addr, int kind)
+static int ak4535_i2c_probe(struct i2c_client *i2c,
+			    const struct i2c_device_id *id)
 {
 	struct snd_soc_device *socdev = ak4535_socdev;
-	struct ak4535_setup_data *setup = socdev->codec_data;
 	struct snd_soc_codec *codec = socdev->codec;
-	struct i2c_client *i2c;
 	int ret;
 
-	if (addr != setup->i2c_address)
-		return -ENODEV;
-
-	client_template.adapter = adap;
-	client_template.addr = addr;
-
-	i2c = kmemdup(&client_template, sizeof(client_template), GFP_KERNEL);
-	if (i2c == NULL)
-		return -ENOMEM;
-
 	i2c_set_clientdata(i2c, codec);
 	codec->control_data = i2c;
 
-	ret = i2c_attach_client(i2c);
-	if (ret < 0) {
-		printk(KERN_ERR "failed to attach codec at addr %x\n", addr);
-		goto err;
-	}
-
 	ret = ak4535_init(socdev);
-	if (ret < 0) {
+	if (ret < 0)
 		printk(KERN_ERR "failed to initialise AK4535\n");
-		goto err;
-	}
-	return ret;
 
-err:
-	kfree(i2c);
 	return ret;
 }
 
-static int ak4535_i2c_detach(struct i2c_client *client)
+static int ak4535_i2c_remove(struct i2c_client *client)
 {
 	struct snd_soc_codec *codec = i2c_get_clientdata(client);
-	i2c_detach_client(client);
 	kfree(codec->reg_cache);
-	kfree(client);
 	return 0;
 }
 
-static int ak4535_i2c_attach(struct i2c_adapter *adap)
-{
-	return i2c_probe(adap, &addr_data, ak4535_codec_probe);
-}
+static const struct i2c_device_id ak4535_i2c_id[] = {
+	{ "ak4535", 0 },
+	{ }
+};
+MODULE_DEVICE_TABLE(i2c, ak4535_i2c_id);
 
-/* corgi i2c codec control layer */
 static struct i2c_driver ak4535_i2c_driver = {
 	.driver = {
 		.name = "AK4535 I2C Codec",
 		.owner = THIS_MODULE,
 	},
-	.id =             I2C_DRIVERID_AK4535,
-	.attach_adapter = ak4535_i2c_attach,
-	.detach_client =  ak4535_i2c_detach,
-	.command =        NULL,
+	.probe =    ak4535_i2c_probe,
+	.remove =   ak4535_i2c_remove,
+	.id_table = ak4535_i2c_id,
 };
 
-static struct i2c_client client_template = {
-	.name =   "AK4535",
-	.driver = &ak4535_i2c_driver,
-};
+static int ak4535_add_i2c_device(struct platform_device *pdev,
+				 const struct ak4535_setup_data *setup)
+{
+	struct i2c_board_info info;
+	struct i2c_adapter *adapter;
+	struct i2c_client *client;
+	int ret;
+
+	ret = i2c_add_driver(&ak4535_i2c_driver);
+	if (ret != 0) {
+		dev_err(&pdev->dev, "can't add i2c driver\n");
+		return ret;
+	}
+
+	memset(&info, 0, sizeof(struct i2c_board_info));
+	info.addr = setup->i2c_address;
+	strlcpy(info.type, "ak4535", I2C_NAME_SIZE);
+
+	adapter = i2c_get_adapter(setup->i2c_bus);
+	if (!adapter) {
+		dev_err(&pdev->dev, "can't get i2c adapter %d\n",
+			setup->i2c_bus);
+		goto err_driver;
+	}
+
+	client = i2c_new_device(adapter, &info);
+	i2c_put_adapter(adapter);
+	if (!client) {
+		dev_err(&pdev->dev, "can't add i2c device at 0x%x\n",
+			(unsigned int)info.addr);
+		goto err_driver;
+	}
+
+	return 0;
+
+err_driver:
+	i2c_del_driver(&ak4535_i2c_driver);
+	return -ENODEV;
+}
 #endif
 
 static int ak4535_probe(struct platform_device *pdev)
@@ -648,12 +646,9 @@ static int ak4535_probe(struct platform_device *pdev)
 	ak4535_socdev = socdev;
 #if defined(CONFIG_I2C) || defined(CONFIG_I2C_MODULE)
 	if (setup->i2c_address) {
-		normal_i2c[0] = setup->i2c_address;
 		codec->hw_write = (hw_write_t)i2c_master_send;
 		codec->hw_read = (hw_read_t)i2c_master_recv;
-		ret = i2c_add_driver(&ak4535_i2c_driver);
-		if (ret != 0)
-			printk(KERN_ERR "can't add i2c driver");
+		ret = ak4535_add_i2c_device(pdev, setup);
 	}
 #else
 	/* Add other interfaces here */
@@ -678,6 +673,7 @@ static int ak4535_remove(struct platform_device *pdev)
 	snd_soc_free_pcms(socdev);
 	snd_soc_dapm_free(socdev);
 #if defined(CONFIG_I2C) || defined(CONFIG_I2C_MODULE)
+	i2c_unregister_device(codec->control_data);
 	i2c_del_driver(&ak4535_i2c_driver);
 #endif
 	kfree(codec->private_data);

sound/soc/codecs/ak4535.h

@@ -37,6 +37,7 @@
 #define AK4535_CACHEREGNUM 	0x10
 
 struct ak4535_setup_data {
+	int            i2c_bus;
 	unsigned short i2c_address;
 };