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

The new-style fscher 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: Reinhard Nissl <rnissl@gmx.de>

drivers/hwmon/fscher.c

@@ -106,9 +106,11 @@ I2C_CLIENT_INSMOD_1(fscher);
  * Functions declaration
  */
 
-static int fscher_attach_adapter(struct i2c_adapter *adapter);
-static int fscher_detect(struct i2c_adapter *adapter, int address, int kind);
-static int fscher_detach_client(struct i2c_client *client);
+static int fscher_probe(struct i2c_client *client,
+			const struct i2c_device_id *id);
+static int fscher_detect(struct i2c_client *client, int kind,
+			 struct i2c_board_info *info);
+static int fscher_remove(struct i2c_client *client);
 static struct fscher_data *fscher_update_device(struct device *dev);
 static void fscher_init_client(struct i2c_client *client);
 
@@ -119,20 +121,28 @@ static int fscher_write_value(struct i2c_client *client, u8 reg, u8 value);
  * Driver data (common to all clients)
  */
 
+static const struct i2c_device_id fscher_id[] = {
+	{ "fscher", fscher },
+	{ }
+};
+
 static struct i2c_driver fscher_driver = {
+	.class		= I2C_CLASS_HWMON,
 	.driver = {
 		.name	= "fscher",
 	},
-	.attach_adapter	= fscher_attach_adapter,
-	.detach_client	= fscher_detach_client,
+	.probe		= fscher_probe,
+	.remove		= fscher_remove,
+	.id_table	= fscher_id,
+	.detect		= fscher_detect,
+	.address_data	= &addr_data,
 };
 
 /*
  * Client data (each client gets its own)
  */
 
 struct fscher_data {
-	struct i2c_client client;
 	struct device *hwmon_dev;
 	struct mutex update_lock;
 	char valid; /* zero until following fields are valid */
@@ -283,38 +293,14 @@ static const struct attribute_group fscher_group = {
  * Real code
  */
 
-static int fscher_attach_adapter(struct i2c_adapter *adapter)
-{
-	if (!(adapter->class & I2C_CLASS_HWMON))
-		return 0;
-	return i2c_probe(adapter, &addr_data, fscher_detect);
-}
-
-static int fscher_detect(struct i2c_adapter *adapter, int address, int kind)
+/* Return 0 if detection is successful, -ENODEV otherwise */
+static int fscher_detect(struct i2c_client *new_client, int kind,
+			 struct i2c_board_info *info)
 {
-	struct i2c_client *new_client;
-	struct fscher_data *data;
-	int err = 0;
+	struct i2c_adapter *adapter = new_client->adapter;
 
 	if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA))
-		goto exit;
-
-	/* OK. For now, we presume we have a valid client. We now create the
-	 * client structure, even though we cannot fill it completely yet.
-	 * But it allows us to access i2c_smbus_read_byte_data. */
-	if (!(data = kzalloc(sizeof(struct fscher_data), GFP_KERNEL))) {
-		err = -ENOMEM;
-		goto exit;
-  	}
-
-	/* The common I2C client data is placed right before the
-	 * Hermes-specific data. */
-	new_client = &data->client;
-	i2c_set_clientdata(new_client, data);
-	new_client->addr = address;
-	new_client->adapter = adapter;
-	new_client->driver = &fscher_driver;
-	new_client->flags = 0;
+		return -ENODEV;
 
 	/* Do the remaining detection unless force or force_fscher parameter */
 	if (kind < 0) {
@@ -324,24 +310,35 @@ static int fscher_detect(struct i2c_adapter *adapter, int address, int kind)
 		     FSCHER_REG_IDENT_1) != 0x45)	/* 'E' */
 		 || (i2c_smbus_read_byte_data(new_client,
 		     FSCHER_REG_IDENT_2) != 0x52))	/* 'R' */
-			goto exit_free;
+			return -ENODEV;
+	}
+
+	strlcpy(info->type, "fscher", I2C_NAME_SIZE);
+
+	return 0;
+}
+
+static int fscher_probe(struct i2c_client *new_client,
+			const struct i2c_device_id *id)
+{
+	struct fscher_data *data;
+	int err;
+
+	data = kzalloc(sizeof(struct fscher_data), GFP_KERNEL);
+	if (!data) {
+		err = -ENOMEM;
+		goto exit;
 	}
 
-	/* Fill in the remaining client fields and put it into the
-	 * global list */
-	strlcpy(new_client->name, "fscher", I2C_NAME_SIZE);
+	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;
-
 	fscher_init_client(new_client);
 
 	/* Register sysfs hooks */
 	if ((err = sysfs_create_group(&new_client->dev.kobj, &fscher_group)))
-		goto exit_detach;
+		goto exit_free;
 
 	data->hwmon_dev = hwmon_device_register(&new_client->dev);
 	if (IS_ERR(data->hwmon_dev)) {
@@ -353,25 +350,19 @@ static int fscher_detect(struct i2c_adapter *adapter, int address, int kind)
 
 exit_remove_files:
 	sysfs_remove_group(&new_client->dev.kobj, &fscher_group);
-exit_detach:
-	i2c_detach_client(new_client);
 exit_free:
 	kfree(data);
 exit:
 	return err;
 }
 
-static int fscher_detach_client(struct i2c_client *client)
+static int fscher_remove(struct i2c_client *client)
 {
 	struct fscher_data *data = i2c_get_clientdata(client);
-	int err;
 
 	hwmon_device_unregister(data->hwmon_dev);
 	sysfs_remove_group(&client->dev.kobj, &fscher_group);
 
-	if ((err = i2c_detach_client(client)))
-		return err;
-
 	kfree(data);
 	return 0;
 }