hwmon: (max1619) Convert to a new-style i2c driver

The new-style max1619 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: Alexey Fisher <fishor@mail.ru>

drivers/hwmon/max1619.c

@@ -79,23 +79,34 @@ I2C_CLIENT_INSMOD_1(max1619);
  * Functions declaration
  */
 
-static int max1619_attach_adapter(struct i2c_adapter *adapter);
-static int max1619_detect(struct i2c_adapter *adapter, int address,
-	int kind);
+static int max1619_probe(struct i2c_client *client,
+			 const struct i2c_device_id *id);
+static int max1619_detect(struct i2c_client *client, int kind,
+			  struct i2c_board_info *info);
 static void max1619_init_client(struct i2c_client *client);
-static int max1619_detach_client(struct i2c_client *client);
+static int max1619_remove(struct i2c_client *client);
 static struct max1619_data *max1619_update_device(struct device *dev);
 
 /*
  * Driver data (common to all clients)
  */
 
+static const struct i2c_device_id max1619_id[] = {
+	{ "max1619", max1619 },
+	{ }
+};
+MODULE_DEVICE_TABLE(i2c, max1619_id);
+
 static struct i2c_driver max1619_driver = {
+	.class		= I2C_CLASS_HWMON,
 	.driver = {
 		.name	= "max1619",
 	},
-	.attach_adapter	= max1619_attach_adapter,
-	.detach_client	= max1619_detach_client,
+	.probe		= max1619_probe,
+	.remove		= max1619_remove,
+	.id_table	= max1619_id,
+	.detect		= max1619_detect,
+	.address_data	= &addr_data,
 };
 
 /*
@@ -103,7 +114,6 @@ static struct i2c_driver max1619_driver = {
  */
 
 struct max1619_data {
-	struct i2c_client client;
 	struct device *hwmon_dev;
 	struct mutex update_lock;
 	char valid; /* zero until following fields are valid */
@@ -208,41 +218,15 @@ static const struct attribute_group max1619_group = {
  * Real code
  */
 
-static int max1619_attach_adapter(struct i2c_adapter *adapter)
+/* Return 0 if detection is successful, -ENODEV otherwise */
+static int max1619_detect(struct i2c_client *new_client, int kind,
+			  struct i2c_board_info *info)
 {
-	if (!(adapter->class & I2C_CLASS_HWMON))
-		return 0;
-	return i2c_probe(adapter, &addr_data, max1619_detect);
-}
-
-/*
- * The following function does more than just detection. If detection
- * succeeds, it also registers the new chip.
- */
-static int max1619_detect(struct i2c_adapter *adapter, int address, int kind)
-{
-	struct i2c_client *new_client;
-	struct max1619_data *data;
-	int err = 0;
-	const char *name = "";	
+	struct i2c_adapter *adapter = new_client->adapter;
 	u8 reg_config=0, reg_convrate=0, reg_status=0;
 
 	if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA))
-		goto exit;
-
-	if (!(data = kzalloc(sizeof(struct max1619_data), GFP_KERNEL))) {
-		err = -ENOMEM;
-		goto exit;
-	}
-
-	/* The common I2C client data is placed right before the
-	   MAX1619-specific data. */
-	new_client = &data->client;
-	i2c_set_clientdata(new_client, data);
-	new_client->addr = address;
-	new_client->adapter = adapter;
-	new_client->driver = &max1619_driver;
-	new_client->flags = 0;
+		return -ENODEV;
 
 	/*
 	 * Now we do the remaining detection. A negative kind means that
@@ -265,8 +249,8 @@ static int max1619_detect(struct i2c_adapter *adapter, int address, int kind)
 		 || reg_convrate > 0x07 || (reg_status & 0x61 ) !=0x00) {
 			dev_dbg(&adapter->dev,
 				"MAX1619 detection failed at 0x%02x.\n",
-				address);
-			goto exit_free;
+				new_client->addr);
+			return -ENODEV;
 		}
 	}
 
@@ -285,28 +269,37 @@ static int max1619_detect(struct i2c_adapter *adapter, int address, int kind)
 			dev_info(&adapter->dev,
 			    "Unsupported chip (man_id=0x%02X, "
 			    "chip_id=0x%02X).\n", man_id, chip_id);
-			goto exit_free;
+			return -ENODEV;
 		}
 	}
 
-	if (kind == max1619)
-		name = "max1619";
+	strlcpy(info->type, "max1619", I2C_NAME_SIZE);
 
-	/* We can fill in the remaining client fields */
-	strlcpy(new_client->name, name, I2C_NAME_SIZE);
+	return 0;
+}
+
+static int max1619_probe(struct i2c_client *new_client,
+			 const struct i2c_device_id *id)
+{
+	struct max1619_data *data;
+	int err;
+
+	data = kzalloc(sizeof(struct max1619_data), GFP_KERNEL);
+	if (!data) {
+		err = -ENOMEM;
+		goto exit;
+	}
+
+	i2c_set_clientdata(new_client, data);
 	data->valid = 0;
 	mutex_init(&data->update_lock);
 
-	/* Tell the I2C layer a new client has arrived */
-	if ((err = i2c_attach_client(new_client)))
-		goto exit_free;
-
 	/* Initialize the MAX1619 chip */
 	max1619_init_client(new_client);
 
 	/* Register sysfs hooks */
 	if ((err = sysfs_create_group(&new_client->dev.kobj, &max1619_group)))
-		goto exit_detach;
+		goto exit_free;
 
 	data->hwmon_dev = hwmon_device_register(&new_client->dev);
 	if (IS_ERR(data->hwmon_dev)) {
@@ -318,8 +311,6 @@ static int max1619_detect(struct i2c_adapter *adapter, int address, int kind)
 
 exit_remove_files:
 	sysfs_remove_group(&new_client->dev.kobj, &max1619_group);
-exit_detach:
-	i2c_detach_client(new_client);
 exit_free:
 	kfree(data);
 exit:
@@ -341,17 +332,13 @@ static void max1619_init_client(struct i2c_client *client)
 					  config & 0xBF); /* run */
 }
 
-static int max1619_detach_client(struct i2c_client *client)
+static int max1619_remove(struct i2c_client *client)
 {
 	struct max1619_data *data = i2c_get_clientdata(client);
-	int err;
 
 	hwmon_device_unregister(data->hwmon_dev);
 	sysfs_remove_group(&client->dev.kobj, &max1619_group);
 
-	if ((err = i2c_detach_client(client)))
-		return err;
-
 	kfree(data);
 	return 0;
 }