hwmon: (max6650) Convert to a new-style i2c driver

The new-style max6650 driver implements the optional detect() callback
to cover the use cases of the legacy driver.
Signed-off-by: Jean Delvare <khali@linux-fr.org>
Cc: Hans J. Koch <hjk@linutronix.de>

drivers/hwmon/max6650.c

@@ -104,22 +104,34 @@ I2C_CLIENT_INSMOD_1(max6650);
 
 #define DIV_FROM_REG(reg) (1 << (reg & 7))
 
-static int max6650_attach_adapter(struct i2c_adapter *adapter);
-static int max6650_detect(struct i2c_adapter *adapter, int address, int kind);
+static int max6650_probe(struct i2c_client *client,
+			 const struct i2c_device_id *id);
+static int max6650_detect(struct i2c_client *client, int kind,
+			  struct i2c_board_info *info);
 static int max6650_init_client(struct i2c_client *client);
-static int max6650_detach_client(struct i2c_client *client);
+static int max6650_remove(struct i2c_client *client);
 static struct max6650_data *max6650_update_device(struct device *dev);
 
 /*
  * Driver data (common to all clients)
  */
 
+static const struct i2c_device_id max6650_id[] = {
+	{ "max6650", max6650 },
+	{ }
+};
+MODULE_DEVICE_TABLE(i2c, max6650_id);
+
 static struct i2c_driver max6650_driver = {
+	.class		= I2C_CLASS_HWMON,
 	.driver = {
 		.name	= "max6650",
 	},
-	.attach_adapter	= max6650_attach_adapter,
-	.detach_client	= max6650_detach_client,
+	.probe		= max6650_probe,
+	.remove		= max6650_remove,
+	.id_table	= max6650_id,
+	.detect		= max6650_detect,
+	.address_data	= &addr_data,
 };
 
 /*
@@ -128,7 +140,6 @@ static struct i2c_driver max6650_driver = {
 
 struct max6650_data
 {
-	struct i2c_client client;
 	struct device *hwmon_dev;
 	struct mutex update_lock;
 	char valid; /* zero until following fields are valid */
@@ -437,47 +448,21 @@ static struct attribute_group max6650_attr_grp = {
  * Real code
  */
 
-static int max6650_attach_adapter(struct i2c_adapter *adapter)
+/* Return 0 if detection is successful, -ENODEV otherwise */
+static int max6650_detect(struct i2c_client *client, int kind,
+			  struct i2c_board_info *info)
 {
-	if (!(adapter->class & I2C_CLASS_HWMON)) {
-		dev_dbg(&adapter->dev,
-			"FATAL: max6650_attach_adapter class HWMON not set\n");
-		return 0;
-	}
-
-	return i2c_probe(adapter, &addr_data, max6650_detect);
-}
-
-/*
- * The following function does more than just detection. If detection
- * succeeds, it also registers the new chip.
- */
-
-static int max6650_detect(struct i2c_adapter *adapter, int address, int kind)
-{
-	struct i2c_client *client;
-	struct max6650_data *data;
-	int err = -ENODEV;
+	struct i2c_adapter *adapter = client->adapter;
+	int address = client->addr;
 
 	dev_dbg(&adapter->dev, "max6650_detect called, kind = %d\n", kind);
 
 	if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA)) {
 		dev_dbg(&adapter->dev, "max6650: I2C bus doesn't support "
 					"byte read mode, skipping.\n");
-		return 0;
-	}
-
-	if (!(data = kzalloc(sizeof(struct max6650_data), GFP_KERNEL))) {
-		dev_err(&adapter->dev, "max6650: out of memory.\n");
-		return -ENOMEM;
+		return -ENODEV;
 	}
 
-	client = &data->client;
-	i2c_set_clientdata(client, data);
-	client->addr = address;
-	client->adapter = adapter;
-	client->driver = &max6650_driver;
-
 	/*
 	 * Now we do the remaining detection. A negative kind means that
 	 * the driver was loaded with no force parameter (default), so we
@@ -501,28 +486,40 @@ static int max6650_detect(struct i2c_adapter *adapter, int address, int kind)
 	    ||(i2c_smbus_read_byte_data(client, MAX6650_REG_COUNT) & 0xFC))) {
 		dev_dbg(&adapter->dev,
 			"max6650: detection failed at 0x%02x.\n", address);
-		goto err_free;
+		return -ENODEV;
 	}
 
 	dev_info(&adapter->dev, "max6650: chip found at 0x%02x.\n", address);
 
-	strlcpy(client->name, "max6650", I2C_NAME_SIZE);
-	mutex_init(&data->update_lock);
+	strlcpy(info->type, "max6650", I2C_NAME_SIZE);
 
-	if ((err = i2c_attach_client(client))) {
-		dev_err(&adapter->dev, "max6650: failed to attach client.\n");
-		goto err_free;
+	return 0;
+}
+
+static int max6650_probe(struct i2c_client *client,
+			 const struct i2c_device_id *id)
+{
+	struct max6650_data *data;
+	int err;
+
+	if (!(data = kzalloc(sizeof(struct max6650_data), GFP_KERNEL))) {
+		dev_err(&client->dev, "out of memory.\n");
+		return -ENOMEM;
 	}
 
+	i2c_set_clientdata(client, data);
+	mutex_init(&data->update_lock);
+
 	/*
 	 * Initialize the max6650 chip
 	 */
-	if (max6650_init_client(client))
-		goto err_detach;
+	err = max6650_init_client(client);
+	if (err)
+		goto err_free;
 
 	err = sysfs_create_group(&client->dev.kobj, &max6650_attr_grp);
 	if (err)
-		goto err_detach;
+		goto err_free;
 
 	data->hwmon_dev = hwmon_device_register(&client->dev);
 	if (!IS_ERR(data->hwmon_dev))
@@ -531,24 +528,19 @@ static int max6650_detect(struct i2c_adapter *adapter, int address, int kind)
 	err = PTR_ERR(data->hwmon_dev);
 	dev_err(&client->dev, "error registering hwmon device.\n");
 	sysfs_remove_group(&client->dev.kobj, &max6650_attr_grp);
-err_detach:
-	i2c_detach_client(client);
 err_free:
 	kfree(data);
 	return err;
 }
 
-static int max6650_detach_client(struct i2c_client *client)
+static int max6650_remove(struct i2c_client *client)
 {
 	struct max6650_data *data = i2c_get_clientdata(client);
-	int err;
 
 	sysfs_remove_group(&client->dev.kobj, &max6650_attr_grp);
 	hwmon_device_unregister(data->hwmon_dev);
-	err = i2c_detach_client(client);
-	if (!err)
-		kfree(data);
-	return err;
+	kfree(data);
+	return 0;
 }
 
 static int max6650_init_client(struct i2c_client *client)