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hwmon: (w83l786ng) Convert to a new-style i2c driver

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The new-style w83l786ng driver implements the optional detect()
callback to cover the use cases of the legacy driver.

Signed-off-by: Jean Delvare <khali@linux-fr.org>
Cc: Kevin Lo <kevlo@kevlo.org>
This commit is contained in:
Jean Delvare 2008-07-16 19:30:18 +02:00 committed by Jean Delvare
parent dc18a4184d
commit 33468e7637
1 changed files with 45 additions and 53 deletions
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98
drivers/hwmon/w83l786ng.c
View file

@ -121,7 +121,6 @@ DIV_TO_REG(long val)
}
struct w83l786ng_data {
struct i2c_client client;
struct device *hwmon_dev;
struct mutex update_lock;
char valid; /* !=0 if following fields are valid */
@ -146,18 +145,30 @@ struct w83l786ng_data {
u8 tolerance[2];
};
static int w83l786ng_attach_adapter(struct i2c_adapter *adapter);
static int w83l786ng_detect(struct i2c_adapter *adapter, int address, int kind);
static int w83l786ng_detach_client(struct i2c_client *client);
static int w83l786ng_probe(struct i2c_client *client,
const struct i2c_device_id *id);
static int w83l786ng_detect(struct i2c_client *client, int kind,
struct i2c_board_info *info);
static int w83l786ng_remove(struct i2c_client *client);
static void w83l786ng_init_client(struct i2c_client *client);
static struct w83l786ng_data *w83l786ng_update_device(struct device *dev);
static const struct i2c_device_id w83l786ng_id[] = {
{ "w83l786ng", w83l786ng },
{ }
};
MODULE_DEVICE_TABLE(i2c, w83l786ng_id);
static struct i2c_driver w83l786ng_driver = {
.class = I2C_CLASS_HWMON,
.driver = {
.name = "w83l786ng",
},
.attach_adapter = w83l786ng_attach_adapter,
.detach_client = w83l786ng_detach_client,
.probe = w83l786ng_probe,
.remove = w83l786ng_remove,
.id_table = w83l786ng_id,
.detect = w83l786ng_detect,
.address_data = &addr_data,
};
static u8
@ -575,42 +586,15 @@ static const struct attribute_group w83l786ng_group = {
};
static int
w83l786ng_attach_adapter(struct i2c_adapter *adapter)
w83l786ng_detect(struct i2c_client *client, int kind,
struct i2c_board_info *info)
{
if (!(adapter->class & I2C_CLASS_HWMON))
return 0;
return i2c_probe(adapter, &addr_data, w83l786ng_detect);
}
static int
w83l786ng_detect(struct i2c_adapter *adapter, int address, int kind)
{
struct i2c_client *client;
struct device *dev;
struct w83l786ng_data *data;
int i, err = 0;
u8 reg_tmp;
struct i2c_adapter *adapter = client->adapter;
if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA)) {
goto exit;
return -ENODEV;
}
/* 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 w83l786ng_{read,write}_value. */
if (!(data = kzalloc(sizeof(struct w83l786ng_data), GFP_KERNEL))) {
err = -ENOMEM;
goto exit;
}
client = &data->client;
dev = &client->dev;
i2c_set_clientdata(client, data);
client->addr = address;
client->adapter = adapter;
client->driver = &w83l786ng_driver;
/*
* Now we do the remaining detection. A negative kind means that
* the driver was loaded with no force parameter (default), so we
@ -627,8 +611,8 @@ w83l786ng_detect(struct i2c_adapter *adapter, int address, int kind)
W83L786NG_REG_CONFIG) & 0x80) != 0x00)) {
dev_dbg(&adapter->dev,
"W83L786NG detection failed at 0x%02x.\n",
address);
goto exit_free;
client->addr);
return -ENODEV;
}
}
@ -651,17 +635,31 @@ w83l786ng_detect(struct i2c_adapter *adapter, int address, int kind)
dev_info(&adapter->dev,
"Unsupported chip (man_id=0x%04X, "
"chip_id=0x%02X).\n", man_id, chip_id);
goto exit_free;
return -ENODEV;
}
}
/* Fill in the remaining client fields and put into the global list */
strlcpy(client->name, "w83l786ng", I2C_NAME_SIZE);
mutex_init(&data->update_lock);
strlcpy(info->type, "w83l786ng", 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
w83l786ng_probe(struct i2c_client *client, const struct i2c_device_id *id)
{
struct device *dev = &client->dev;
struct w83l786ng_data *data;
int i, err = 0;
u8 reg_tmp;
data = kzalloc(sizeof(struct w83l786ng_data), GFP_KERNEL);
if (!data) {
err = -ENOMEM;
goto exit;
}
i2c_set_clientdata(client, data);
mutex_init(&data->update_lock);
/* Initialize the chip */
w83l786ng_init_client(client);
@ -693,25 +691,19 @@ w83l786ng_detect(struct i2c_adapter *adapter, int address, int kind)
exit_remove:
sysfs_remove_group(&client->dev.kobj, &w83l786ng_group);
i2c_detach_client(client);
exit_free:
kfree(data);
exit:
return err;
}
static int
w83l786ng_detach_client(struct i2c_client *client)
w83l786ng_remove(struct i2c_client *client)
{
struct w83l786ng_data *data = i2c_get_clientdata(client);
int err;
hwmon_device_unregister(data->hwmon_dev);
sysfs_remove_group(&client->dev.kobj, &w83l786ng_group);
if ((err = i2c_detach_client(client)))
return err;
kfree(data);
return 0;