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

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

Signed-off-by: Jean Delvare <khali@linux-fr.org>
This commit is contained in:
Jean Delvare 2008-07-16 19:30:12 +02:00 committed by Jean Delvare
parent 40ac1994bf
commit b9e39b1b1b
1 changed files with 41 additions and 53 deletions
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94
drivers/hwmon/fscpos.c
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@ -87,9 +87,11 @@ static u8 FSCPOS_REG_TEMP_STATE[] = { 0x71, 0x81, 0x91 };
/*
* Functions declaration
*/
static int fscpos_attach_adapter(struct i2c_adapter *adapter);
static int fscpos_detect(struct i2c_adapter *adapter, int address, int kind);
static int fscpos_detach_client(struct i2c_client *client);
static int fscpos_probe(struct i2c_client *client,
const struct i2c_device_id *id);
static int fscpos_detect(struct i2c_client *client, int kind,
struct i2c_board_info *info);
static int fscpos_remove(struct i2c_client *client);
static int fscpos_read_value(struct i2c_client *client, u8 reg);
static int fscpos_write_value(struct i2c_client *client, u8 reg, u8 value);
@ -101,19 +103,27 @@ static void reset_fan_alarm(struct i2c_client *client, int nr);
/*
* Driver data (common to all clients)
*/
static const struct i2c_device_id fscpos_id[] = {
{ "fscpos", fscpos },
{ }
};
static struct i2c_driver fscpos_driver = {
.class = I2C_CLASS_HWMON,
.driver = {
.name = "fscpos",
},
.attach_adapter = fscpos_attach_adapter,
.detach_client = fscpos_detach_client,
.probe = fscpos_probe,
.remove = fscpos_remove,
.id_table = fscpos_id,
.detect = fscpos_detect,
.address_data = &addr_data,
};
/*
* Client data (each client gets its own)
*/
struct fscpos_data {
struct i2c_client client;
struct device *hwmon_dev;
struct mutex update_lock;
char valid; /* 0 until following fields are valid */
@ -470,39 +480,14 @@ static const struct attribute_group fscpos_group = {
.attrs = fscpos_attributes,
};
static int fscpos_attach_adapter(struct i2c_adapter *adapter)
/* Return 0 if detection is successful, -ENODEV otherwise */
static int fscpos_detect(struct i2c_client *new_client, int kind,
struct i2c_board_info *info)
{
if (!(adapter->class & I2C_CLASS_HWMON))
return 0;
return i2c_probe(adapter, &addr_data, fscpos_detect);
}
static int fscpos_detect(struct i2c_adapter *adapter, int address, int kind)
{
struct i2c_client *new_client;
struct fscpos_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 fscpos_{read,write}_value.
*/
if (!(data = kzalloc(sizeof(struct fscpos_data), GFP_KERNEL))) {
err = -ENOMEM;
goto exit;
}
new_client = &data->client;
i2c_set_clientdata(new_client, data);
new_client->addr = address;
new_client->adapter = adapter;
new_client->driver = &fscpos_driver;
new_client->flags = 0;
return -ENODEV;
/* Do the remaining detection unless force or force_fscpos parameter */
if (kind < 0) {
@ -512,22 +497,30 @@ static int fscpos_detect(struct i2c_adapter *adapter, int address, int kind)
!= 0x45) /* 'E' */
|| (fscpos_read_value(new_client, FSCPOS_REG_IDENT_2)
!= 0x47))/* 'G' */
{
dev_dbg(&new_client->dev, "fscpos detection failed\n");
goto exit_free;
}
return -ENODEV;
}
/* Fill in the remaining client fields and put it in the global list */
strlcpy(new_client->name, "fscpos", I2C_NAME_SIZE);
strlcpy(info->type, "fscpos", I2C_NAME_SIZE);
return 0;
}
static int fscpos_probe(struct i2c_client *new_client,
const struct i2c_device_id *id)
{
struct fscpos_data *data;
int err;
data = kzalloc(sizeof(struct fscpos_data), GFP_KERNEL);
if (!data) {
err = -ENOMEM;
goto exit;
}
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;
/* Inizialize the fscpos chip */
fscpos_init_client(new_client);
@ -536,7 +529,7 @@ static int fscpos_detect(struct i2c_adapter *adapter, int address, int kind)
/* Register sysfs hooks */
if ((err = sysfs_create_group(&new_client->dev.kobj, &fscpos_group)))
goto exit_detach;
goto exit_free;
data->hwmon_dev = hwmon_device_register(&new_client->dev);
if (IS_ERR(data->hwmon_dev)) {
@ -548,24 +541,19 @@ static int fscpos_detect(struct i2c_adapter *adapter, int address, int kind)
exit_remove_files:
sysfs_remove_group(&new_client->dev.kobj, &fscpos_group);
exit_detach:
i2c_detach_client(new_client);
exit_free:
kfree(data);
exit:
return err;
}
static int fscpos_detach_client(struct i2c_client *client)
static int fscpos_remove(struct i2c_client *client)
{
struct fscpos_data *data = i2c_get_clientdata(client);
int err;
hwmon_device_unregister(data->hwmon_dev);
sysfs_remove_group(&client->dev.kobj, &fscpos_group);
if ((err = i2c_detach_client(client)))
return err;
kfree(data);
return 0;
}