[PATCH] hwmon: (smsc47m192) Convert to a new-style i2c driver

[Jean Delvare <khali-PUYAD+kWke1g9hUCZPvPmw@public.gmane.org>]

The new-style smsc47m192 driver implements the optional detect()
callback to cover the use cases of the legacy driver.

Signed-off-by: Jean Delvare <khali-PUYAD+kWke1g9hUCZPvPmw@public.gmane.org>
Cc: Hartmut Rick <linux-b/THyiajkxVQ8441yD4n9A@public.gmane.org>
---
 drivers/hwmon/smsc47m192.c |  102 +++++++++++++++++++-------------------------
 1 file changed, 46 insertions(+), 56 deletions(-)

--- linux-2.6.26-rc9.orig/drivers/hwmon/smsc47m192.c	2008-07-12 09:20:29.000000000 +0200
+++ linux-2.6.26-rc9/drivers/hwmon/smsc47m192.c	2008-07-12 10:27:12.000000000 +0200
@@ -96,7 +96,6 @@ static inline int TEMP_FROM_REG(s8 val)
 }
 
 struct smsc47m192_data {
-	struct i2c_client client;
 	struct device *hwmon_dev;
 	struct mutex update_lock;
 	char valid;		/* !=0 if following fields are valid */
@@ -114,18 +113,29 @@ struct smsc47m192_data {
 	u8 vrm;
 };
 
-static int smsc47m192_attach_adapter(struct i2c_adapter *adapter);
-static int smsc47m192_detect(struct i2c_adapter *adapter, int address,
-		int kind);
-static int smsc47m192_detach_client(struct i2c_client *client);
+static int smsc47m192_probe(struct i2c_client *client,
+			    const struct i2c_device_id *id);
+static int smsc47m192_detect(struct i2c_client *client, int kind,
+			     struct i2c_board_info *info);
+static int smsc47m192_remove(struct i2c_client *client);
 static struct smsc47m192_data *smsc47m192_update_device(struct device *dev);
 
+static const struct i2c_device_id smsc47m192_id[] = {
+	{ "smsc47m192", smsc47m192 },
+	{ }
+};
+MODULE_DEVICE_TABLE(i2c, smsc47m192_id);
+
 static struct i2c_driver smsc47m192_driver = {
+	.class		= I2C_CLASS_HWMON,
 	.driver = {
 		.name	= "smsc47m192",
 	},
-	.attach_adapter	= smsc47m192_attach_adapter,
-	.detach_client	= smsc47m192_detach_client,
+	.probe		= smsc47m192_probe,
+	.remove		= smsc47m192_remove,
+	.id_table	= smsc47m192_id,
+	.detect		= smsc47m192_detect,
+	.address_data	= &addr_data,
 };
 
 /* Voltages */
@@ -440,17 +450,6 @@ static const struct attribute_group smsc
 	.attrs = smsc47m192_attributes_in4,
 };
 
-/* This function is called when:
-    * smsc47m192_driver is inserted (when this module is loaded), for each
-      available adapter
-    * when a new adapter is inserted (and smsc47m192_driver is still present) */
-static int smsc47m192_attach_adapter(struct i2c_adapter *adapter)
-{
-	if (!(adapter->class & I2C_CLASS_HWMON))
-		return 0;
-	return i2c_probe(adapter, &addr_data, smsc47m192_detect);
-}
-
 static void smsc47m192_init_client(struct i2c_client *client)
 {
 	int i;
@@ -481,31 +480,15 @@ static void smsc47m192_init_client(struc
 	}
 }
 
-/* This function is called by i2c_probe */
-static int smsc47m192_detect(struct i2c_adapter *adapter, int address,
-		int kind)
+/* Return 0 if detection is successful, -ENODEV otherwise */
+static int smsc47m192_detect(struct i2c_client *client, int kind,
+			     struct i2c_board_info *info)
 {
-	struct i2c_client *client;
-	struct smsc47m192_data *data;
-	int err = 0;
-	int version, config;
+	struct i2c_adapter *adapter = client->adapter;
+	int version;
 
 	if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA))
-		goto exit;
-
-	if (!(data = kzalloc(sizeof(struct smsc47m192_data), GFP_KERNEL))) {
-		err = -ENOMEM;
-		goto exit;
-	}
-
-	client = &data->client;
-	i2c_set_clientdata(client, data);
-	client->addr = address;
-	client->adapter = adapter;
-	client->driver = &smsc47m192_driver;
-
-	if (kind == 0)
-		kind = smsc47m192;
+		return -ENODEV;
 
 	/* Detection criteria from sensors_detect script */
 	if (kind < 0) {
@@ -523,26 +506,39 @@ static int smsc47m192_detect(struct i2c_
 		} else {
 			dev_dbg(&adapter->dev,
 				"SMSC47M192 detection failed at 0x%02x\n",
-				address);
-			goto exit_free;
+				client->addr);
+			return -ENODEV;
 		}
 	}
 
-	/* Fill in the remaining client fields and put into the global list */
-	strlcpy(client->name, "smsc47m192", I2C_NAME_SIZE);
+	strlcpy(info->type, "smsc47m192", I2C_NAME_SIZE);
+
+	return 0;
+}
+
+static int smsc47m192_probe(struct i2c_client *client,
+			    const struct i2c_device_id *id)
+{
+	struct smsc47m192_data *data;
+	int config;
+	int err;
+
+	data = kzalloc(sizeof(struct smsc47m192_data), GFP_KERNEL);
+	if (!data) {
+		err = -ENOMEM;
+		goto exit;
+	}
+
+	i2c_set_clientdata(client, data);
 	data->vrm = vid_which_vrm();
 	mutex_init(&data->update_lock);
 
-	/* Tell the I2C layer a new client has arrived */
-	if ((err = i2c_attach_client(client)))
-		goto exit_free;
-
 	/* Initialize the SMSC47M192 chip */
 	smsc47m192_init_client(client);
 
 	/* Register sysfs hooks */
 	if ((err = sysfs_create_group(&client->dev.kobj, &smsc47m192_group)))
-		goto exit_detach;
+		goto exit_free;
 
 	/* Pin 110 is either in4 (+12V) or VID4 */
 	config = i2c_smbus_read_byte_data(client, SMSC47M192_REG_CONFIG);
@@ -563,26 +559,20 @@ static int smsc47m192_detect(struct i2c_
 exit_remove_files:
 	sysfs_remove_group(&client->dev.kobj, &smsc47m192_group);
 	sysfs_remove_group(&client->dev.kobj, &smsc47m192_group_in4);
-exit_detach:
-	i2c_detach_client(client);
 exit_free:
 	kfree(data);
 exit:
 	return err;
 }
 
-static int smsc47m192_detach_client(struct i2c_client *client)
+static int smsc47m192_remove(struct i2c_client *client)
 {
 	struct smsc47m192_data *data = i2c_get_clientdata(client);
-	int err;
 
 	hwmon_device_unregister(data->hwmon_dev);
 	sysfs_remove_group(&client->dev.kobj, &smsc47m192_group);
 	sysfs_remove_group(&client->dev.kobj, &smsc47m192_group_in4);
 
-	if ((err = i2c_detach_client(client)))
-		return err;
-
 	kfree(data);
 
 	return 0;


-- 
Jean Delvare

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