[PATCH] hwmon: (lm93) Convert to a new-style i2c driver

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

The new-style lm93 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: Mark M. Hoffman <mhoffman-xQSgfq/1h4JiLUuM0BA3LQ@public.gmane.org>
Cc: Eric J. Bowersox <ericb-DfBhb2MYPLjQT0dZR+AlfA@public.gmane.org>
Cc: Carsten Emde <cbe-Q945KHDl0DbYtjvyW6yDsg@public.gmane.org>
Cc: Hans J. Koch <hjk-hfZtesqFncYOwBW4kG4KsQ@public.gmane.org>
---
 drivers/hwmon/lm93.c |  126 +++++++++++++++++++++++---------------------------
 1 file changed, 60 insertions(+), 66 deletions(-)

--- linux-2.6.26-rc9.orig/drivers/hwmon/lm93.c	2008-07-12 09:20:29.000000000 +0200
+++ linux-2.6.26-rc9/drivers/hwmon/lm93.c	2008-07-12 10:27:15.000000000 +0200
@@ -200,7 +200,6 @@ struct block1_t {
  * Client-specific data
  */
 struct lm93_data {
-	struct i2c_client client;
 	struct device *hwmon_dev;
 
 	struct mutex update_lock;
@@ -2501,45 +2500,14 @@ static void lm93_init_client(struct i2c_
 		 "chip to signal ready!\n");
 }
 
-static int lm93_detect(struct i2c_adapter *adapter, int address, int kind)
+/* Return 0 if detection is successful, -ENODEV otherwise */
+static int lm93_detect(struct i2c_client *client, int kind,
+		       struct i2c_board_info *info)
 {
-	struct lm93_data *data;
-	struct i2c_client *client;
-
-	int err = -ENODEV, func;
-	void (*update)(struct lm93_data *, struct i2c_client *);
-
-	/* choose update routine based on bus capabilities */
-	func = i2c_get_functionality(adapter);
-	if ( ((LM93_SMBUS_FUNC_FULL & func) == LM93_SMBUS_FUNC_FULL) &&
-			(!disable_block) ) {
-		dev_dbg(&adapter->dev,"using SMBus block data transactions\n");
-		update = lm93_update_client_full;
-	} else if ((LM93_SMBUS_FUNC_MIN & func) == LM93_SMBUS_FUNC_MIN) {
-		dev_dbg(&adapter->dev,"disabled SMBus block data "
-			"transactions\n");
-		update = lm93_update_client_min;
-	} else {
-		dev_dbg(&adapter->dev,"detect failed, "
-			"smbus byte and/or word data not supported!\n");
-		goto err_out;
-	}
+	struct i2c_adapter *adapter = client->adapter;
 
-	/* 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 lm78_{read,write}_value. */
-
-	if ( !(data = kzalloc(sizeof(struct lm93_data), GFP_KERNEL))) {
-		dev_dbg(&adapter->dev,"out of memory!\n");
-		err = -ENOMEM;
-		goto err_out;
-	}
-
-	client = &data->client;
-	i2c_set_clientdata(client, data);
-	client->addr = address;
-	client->adapter = adapter;
-	client->driver = &lm93_driver;
+	if (!i2c_check_functionality(adapter, LM93_SMBUS_FUNC_MIN))
+		return -ENODEV;
 
 	/* detection */
 	if (kind < 0) {
@@ -2548,7 +2516,7 @@ static int lm93_detect(struct i2c_adapte
 		if (mfr != 0x01) {
 			dev_dbg(&adapter->dev,"detect failed, "
 				"bad manufacturer id 0x%02x!\n", mfr);
-			goto err_free;
+			return -ENODEV;
 		}
 	}
 
@@ -2563,31 +2531,61 @@ static int lm93_detect(struct i2c_adapte
 			if (kind == 0)
 				dev_dbg(&adapter->dev,
 					"(ignored 'force' parameter)\n");
-			goto err_free;
+			return -ENODEV;
 		}
 	}
 
-	/* fill in remaining client fields */
-	strlcpy(client->name, "lm93", I2C_NAME_SIZE);
+	strlcpy(info->type, "lm93", I2C_NAME_SIZE);
 	dev_dbg(&adapter->dev,"loading %s at %d,0x%02x\n",
 		client->name, i2c_adapter_id(client->adapter),
 		client->addr);
 
+	return 0;
+}
+
+static int lm93_probe(struct i2c_client *client,
+		      const struct i2c_device_id *id)
+{
+	struct lm93_data *data;
+	int err, func;
+	void (*update)(struct lm93_data *, struct i2c_client *);
+
+	/* choose update routine based on bus capabilities */
+	func = i2c_get_functionality(client->adapter);
+	if (((LM93_SMBUS_FUNC_FULL & func) == LM93_SMBUS_FUNC_FULL) &&
+			(!disable_block)) {
+		dev_dbg(&client->dev, "using SMBus block data transactions\n");
+		update = lm93_update_client_full;
+	} else if ((LM93_SMBUS_FUNC_MIN & func) == LM93_SMBUS_FUNC_MIN) {
+		dev_dbg(&client->dev, "disabled SMBus block data "
+			"transactions\n");
+		update = lm93_update_client_min;
+	} else {
+		dev_dbg(&client->dev, "detect failed, "
+			"smbus byte and/or word data not supported!\n");
+		err = -ENODEV;
+		goto err_out;
+	}
+
+	data = kzalloc(sizeof(struct lm93_data), GFP_KERNEL);
+	if (!data) {
+		dev_dbg(&client->dev, "out of memory!\n");
+		err = -ENOMEM;
+		goto err_out;
+	}
+	i2c_set_clientdata(client, data);
+
 	/* housekeeping */
 	data->valid = 0;
 	data->update = update;
 	mutex_init(&data->update_lock);
 
-	/* tell the I2C layer a new client has arrived */
-	if ((err = i2c_attach_client(client)))
-		goto err_free;
-
 	/* initialize the chip */
 	lm93_init_client(client);
 
 	err = sysfs_create_group(&client->dev.kobj, &lm93_attr_grp);
 	if (err)
-		goto err_detach;
+		goto err_free;
 
 	/* Register hwmon driver class */
 	data->hwmon_dev = hwmon_device_register(&client->dev);
@@ -2597,43 +2595,39 @@ static int lm93_detect(struct i2c_adapte
 	err = PTR_ERR(data->hwmon_dev);
 	dev_err(&client->dev, "error registering hwmon device.\n");
 	sysfs_remove_group(&client->dev.kobj, &lm93_attr_grp);
-err_detach:
-	i2c_detach_client(client);
 err_free:
 	kfree(data);
 err_out:
 	return err;
 }
 
-/* This function is called when:
-     * lm93_driver is inserted (when this module is loaded), for each
-       available adapter
-     * when a new adapter is inserted (and lm93_driver is still present) */
-static int lm93_attach_adapter(struct i2c_adapter *adapter)
-{
-	return i2c_probe(adapter, &addr_data, lm93_detect);
-}
-
-static int lm93_detach_client(struct i2c_client *client)
+static int lm93_remove(struct i2c_client *client)
 {
 	struct lm93_data *data = i2c_get_clientdata(client);
-	int err = 0;
 
 	hwmon_device_unregister(data->hwmon_dev);
 	sysfs_remove_group(&client->dev.kobj, &lm93_attr_grp);
 
-	err = i2c_detach_client(client);
-	if (!err)
-		kfree(data);
-	return err;
+	kfree(data);
+	return 0;
 }
 
+static const struct i2c_device_id lm93_id[] = {
+	{ "lm93", lm93 },
+	{ }
+};
+MODULE_DEVICE_TABLE(i2c, lm93_id);
+
 static struct i2c_driver lm93_driver = {
+	.class		= I2C_CLASS_HWMON,
 	.driver = {
 		.name	= "lm93",
 	},
-	.attach_adapter	= lm93_attach_adapter,
-	.detach_client	= lm93_detach_client,
+	.probe		= lm93_probe,
+	.remove		= lm93_remove,
+	.id_table	= lm93_id,
+	.detect		= lm93_detect,
+	.address_data	= &addr_data,
 };
 
 static int __init lm93_init(void)


-- 
Jean Delvare

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