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Commit 95d80e7c authored by Jean Delvare's avatar Jean Delvare Committed by Jean Delvare
Browse files

hwmon: (gl518sm) Convert to a new-style i2c driver 



The new-style gl518sm 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 b9e39b1b

drivers/hwmon/gl518sm.c

+47 −52
Original line number Diff line number Diff line
@@ -114,7 +114,6 @@ static inline u8 FAN_TO_REG(long rpm, int div) 


/* Each client has this additional data */

struct gl518_data {

	struct i2c_client client;

	struct device *hwmon_dev;

	enum chips type;
@@ -138,21 +137,33 @@ struct gl518_data { 
	u8 beep_enable;		/* Boolean */

};



static int gl518_attach_adapter(struct i2c_adapter *adapter);

static int gl518_detect(struct i2c_adapter *adapter, int address, int kind);

static int gl518_probe(struct i2c_client *client,

		       const struct i2c_device_id *id);

static int gl518_detect(struct i2c_client *client, int kind,

			struct i2c_board_info *info);

static void gl518_init_client(struct i2c_client *client);

static int gl518_detach_client(struct i2c_client *client);

static int gl518_remove(struct i2c_client *client);

static int gl518_read_value(struct i2c_client *client, u8 reg);

static int gl518_write_value(struct i2c_client *client, u8 reg, u16 value);

static struct gl518_data *gl518_update_device(struct device *dev);



static const struct i2c_device_id gl518_id[] = {

	{ "gl518sm", 0 },

	{ }

};

MODULE_DEVICE_TABLE(i2c, gl518_id);



/* This is the driver that will be inserted */

static struct i2c_driver gl518_driver = {

	.class		= I2C_CLASS_HWMON,

	.driver = {

		.name	= "gl518sm",

	},

	.attach_adapter	= gl518_attach_adapter,

	.detach_client	= gl518_detach_client,

	.probe		= gl518_probe,

	.remove		= gl518_remove,

	.id_table	= gl518_id,

	.detect		= gl518_detect,

	.address_data	= &addr_data,

};



/*
@@ -472,46 +483,23 @@ static const struct attribute_group gl518_group_r80 = { 
 * Real code

 */



static int gl518_attach_adapter(struct i2c_adapter *adapter)

{

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

		return 0;

	return i2c_probe(adapter, &addr_data, gl518_detect);

}



static int gl518_detect(struct i2c_adapter *adapter, int address, int kind)

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

static int gl518_detect(struct i2c_client *client, int kind,

			struct i2c_board_info *info)

{

	struct i2c_adapter *adapter = client->adapter;

	int i;

	struct i2c_client *client;

	struct gl518_data *data;

	int err = 0;



	if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA |

				     I2C_FUNC_SMBUS_WORD_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 gl518_{read,write}_value. */



	if (!(data = kzalloc(sizeof(struct gl518_data), GFP_KERNEL))) {

		err = -ENOMEM;

		goto exit;

	}



	client = &data->client;

	i2c_set_clientdata(client, data);



	client->addr = address;

	client->adapter = adapter;

	client->driver = &gl518_driver;

		return -ENODEV;



	/* Now, we do the remaining detection. */



	if (kind < 0) {

		if ((gl518_read_value(client, GL518_REG_CHIP_ID) != 0x80)

		 || (gl518_read_value(client, GL518_REG_CONF) & 0x80))

			goto exit_free;

			return -ENODEV;

	}



	/* Determine the chip type. */
@@ -526,19 +514,32 @@ static int gl518_detect(struct i2c_adapter *adapter, int address, int kind) 
				dev_info(&adapter->dev,

				    "Ignoring 'force' parameter for unknown "

				    "chip at adapter %d, address 0x%02x\n",

				    i2c_adapter_id(adapter), address);

			goto exit_free;

				    i2c_adapter_id(adapter), client->addr);

			return -ENODEV;

		}

	}



	/* Fill in the remaining client fields */

	strlcpy(client->name, "gl518sm", I2C_NAME_SIZE);

	data->type = kind;

	mutex_init(&data->update_lock);

	strlcpy(info->type, "gl518sm", I2C_NAME_SIZE);



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

	if ((err = i2c_attach_client(client)))

		goto exit_free;

	return 0;

}



static int gl518_probe(struct i2c_client *client,

		       const struct i2c_device_id *id)

{

	struct gl518_data *data;

	int err, revision;



	data = kzalloc(sizeof(struct gl518_data), GFP_KERNEL);

	if (!data) {

		err = -ENOMEM;

		goto exit;

	}



	i2c_set_clientdata(client, data);

	revision = gl518_read_value(client, GL518_REG_REVISION);

	data->type = revision == 0x80 ? gl518sm_r80 : gl518sm_r00;

	mutex_init(&data->update_lock);



	/* Initialize the GL518SM chip */

	data->alarm_mask = 0xff;
@@ -546,7 +547,7 @@ static int gl518_detect(struct i2c_adapter *adapter, int address, int kind) 


	/* Register sysfs hooks */

	if ((err = sysfs_create_group(&client->dev.kobj, &gl518_group)))

		goto exit_detach;

		goto exit_free;

	if (data->type == gl518sm_r80)

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

					      &gl518_group_r80)))
@@ -564,8 +565,6 @@ exit_remove_files: 
	sysfs_remove_group(&client->dev.kobj, &gl518_group);

	if (data->type == gl518sm_r80)

		sysfs_remove_group(&client->dev.kobj, &gl518_group_r80);

exit_detach:

	i2c_detach_client(client);

exit_free:

	kfree(data);

exit:
@@ -591,19 +590,15 @@ static void gl518_init_client(struct i2c_client *client) 
	gl518_write_value(client, GL518_REG_CONF, 0x40 | regvalue);

}



static int gl518_detach_client(struct i2c_client *client)

static int gl518_remove(struct i2c_client *client)

{

	struct gl518_data *data = i2c_get_clientdata(client);

	int err;



	hwmon_device_unregister(data->hwmon_dev);

	sysfs_remove_group(&client->dev.kobj, &gl518_group);

	if (data->type == gl518sm_r80)

		sysfs_remove_group(&client->dev.kobj, &gl518_group_r80);



	if ((err = i2c_detach_client(client)))

		return err;



	kfree(data);

	return 0;

}