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Commit 8c8bacc8 authored by Jean Delvare's avatar Jean Delvare Committed by Jean Delvare
Browse files

hwmon: (lm80) Convert to a new-style i2c driver 



The new-style lm80 driver implements the optional detect() callback
to cover the use cases of the legacy driver.

Signed-off-by: default avatarJean Delvare <khali@linux-fr.org>
parent a189dd62

drivers/hwmon/lm80.c

+43 −51
Original line number Diff line number Diff line
@@ -108,7 +108,6 @@ static inline long TEMP_FROM_REG(u16 temp) 
 */



struct lm80_data {

	struct i2c_client client;

	struct device *hwmon_dev;

	struct mutex update_lock;

	char valid;		/* !=0 if following fields are valid */
@@ -132,10 +131,12 @@ struct lm80_data { 
 * Functions declaration

 */



static int lm80_attach_adapter(struct i2c_adapter *adapter);

static int lm80_detect(struct i2c_adapter *adapter, int address, int kind);

static int lm80_probe(struct i2c_client *client,

		      const struct i2c_device_id *id);

static int lm80_detect(struct i2c_client *client, int kind,

		       struct i2c_board_info *info);

static void lm80_init_client(struct i2c_client *client);

static int lm80_detach_client(struct i2c_client *client);

static int lm80_remove(struct i2c_client *client);

static struct lm80_data *lm80_update_device(struct device *dev);

static int lm80_read_value(struct i2c_client *client, u8 reg);

static int lm80_write_value(struct i2c_client *client, u8 reg, u8 value);
@@ -144,12 +145,22 @@ static int lm80_write_value(struct i2c_client *client, u8 reg, u8 value); 
 * Driver data (common to all clients)

 */



static const struct i2c_device_id lm80_id[] = {

	{ "lm80", lm80 },

	{ }

};

MODULE_DEVICE_TABLE(i2c, lm80_id);



static struct i2c_driver lm80_driver = {

	.class		= I2C_CLASS_HWMON,

	.driver = {

		.name	= "lm80",

	},

	.attach_adapter	= lm80_attach_adapter,

	.detach_client	= lm80_detach_client,

	.probe		= lm80_probe,

	.remove		= lm80_remove,

	.id_table	= lm80_id,

	.detect		= lm80_detect,

	.address_data	= &addr_data,

};



/*
@@ -383,13 +394,6 @@ static SENSOR_DEVICE_ATTR(temp1_crit_alarm, S_IRUGO, show_alarm, NULL, 13); 
 * Real code

 */



static int lm80_attach_adapter(struct i2c_adapter *adapter)

{

	if (!(adapter->class & I2C_CLASS_HWMON))

		return 0;

	return i2c_probe(adapter, &addr_data, lm80_detect);

}



static struct attribute *lm80_attributes[] = {

	&sensor_dev_attr_in0_min.dev_attr.attr,

	&sensor_dev_attr_in1_min.dev_attr.attr,
@@ -442,53 +446,46 @@ static const struct attribute_group lm80_group = { 
	.attrs = lm80_attributes,

};



static int lm80_detect(struct i2c_adapter *adapter, int address, int kind)

/* Return 0 if detection is successful, -ENODEV otherwise */

static int lm80_detect(struct i2c_client *client, int kind,

		       struct i2c_board_info *info)

{

	struct i2c_adapter *adapter = client->adapter;

	int i, cur;

	struct i2c_client *client;

	struct lm80_data *data;

	int err = 0;

	const char *name;



	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 lm80_{read,write}_value. */

	if (!(data = kzalloc(sizeof(struct lm80_data), GFP_KERNEL))) {

		err = -ENOMEM;

		goto exit;

	}



	client = &data->client;

	i2c_set_clientdata(client, data);

	client->addr = address;

	client->adapter = adapter;

	client->driver = &lm80_driver;

		return -ENODEV;



	/* Now, we do the remaining detection. It is lousy. */

	if (lm80_read_value(client, LM80_REG_ALARM2) & 0xc0)

		goto error_free;

		return -ENODEV;

	for (i = 0x2a; i <= 0x3d; i++) {

		cur = i2c_smbus_read_byte_data(client, i);

		if ((i2c_smbus_read_byte_data(client, i + 0x40) != cur)

		 || (i2c_smbus_read_byte_data(client, i + 0x80) != cur)

		 || (i2c_smbus_read_byte_data(client, i + 0xc0) != cur))

		    goto error_free;

		    return -ENODEV;

	}



	/* Determine the chip type - only one kind supported! */

	kind = lm80;

	name = "lm80";

	strlcpy(info->type, "lm80", I2C_NAME_SIZE);



	/* Fill in the remaining client fields */

	strlcpy(client->name, name, I2C_NAME_SIZE);

	mutex_init(&data->update_lock);

	return 0;

}



	/* Tell the I2C layer a new client has arrived */

	if ((err = i2c_attach_client(client)))

		goto error_free;

static int lm80_probe(struct i2c_client *client,

		      const struct i2c_device_id *id)

{

	struct lm80_data *data;

	int err;



	data = kzalloc(sizeof(struct lm80_data), GFP_KERNEL);

	if (!data) {

		err = -ENOMEM;

		goto exit;

	}



	i2c_set_clientdata(client, data);

	mutex_init(&data->update_lock);



	/* Initialize the LM80 chip */

	lm80_init_client(client);
@@ -499,7 +496,7 @@ static int lm80_detect(struct i2c_adapter *adapter, int address, int kind) 


	/* Register sysfs hooks */

	if ((err = sysfs_create_group(&client->dev.kobj, &lm80_group)))

		goto error_detach;

		goto error_free;



	data->hwmon_dev = hwmon_device_register(&client->dev);

	if (IS_ERR(data->hwmon_dev)) {
@@ -511,23 +508,18 @@ static int lm80_detect(struct i2c_adapter *adapter, int address, int kind) 


error_remove:

	sysfs_remove_group(&client->dev.kobj, &lm80_group);

error_detach:

	i2c_detach_client(client);

error_free:

	kfree(data);

exit:

	return err;

}



static int lm80_detach_client(struct i2c_client *client)

static int lm80_remove(struct i2c_client *client)

{

	struct lm80_data *data = i2c_get_clientdata(client);

	int err;



	hwmon_device_unregister(data->hwmon_dev);

	sysfs_remove_group(&client->dev.kobj, &lm80_group);

	if ((err = i2c_detach_client(client)))

		return err;



	kfree(data);

	return 0;