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hwmon: (max6650) Convert to a new-style i2c driver 

The new-style max6650 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: Hans J. Koch <hjk@linutronix.de>
This commit is contained in:
Jean Delvare 2008-07-16 19:30:16 +02:00 committed by Jean Delvare
parent c6d3f6fa1b
commit 0d57abd5b8
1 changed files with 47 additions and 55 deletions
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102
drivers/hwmon/max6650.c
View File

@ -104,22 +104,34 @@ I2C_CLIENT_INSMOD_1(max6650);
#define DIV_FROM_REG(reg) (1 << (reg & 7))
static int max6650_attach_adapter(struct i2c_adapter *adapter);
static int max6650_detect(struct i2c_adapter *adapter, int address, int kind);
static int max6650_probe(struct i2c_client *client,
const struct i2c_device_id *id);
static int max6650_detect(struct i2c_client *client, int kind,
struct i2c_board_info *info);
static int max6650_init_client(struct i2c_client *client);
static int max6650_detach_client(struct i2c_client *client);
static int max6650_remove(struct i2c_client *client);
static struct max6650_data *max6650_update_device(struct device *dev);
/*
* Driver data (common to all clients)
*/
static const struct i2c_device_id max6650_id[] = {
{ "max6650", max6650 },
{ }
};
MODULE_DEVICE_TABLE(i2c, max6650_id);
static struct i2c_driver max6650_driver = {
.class = I2C_CLASS_HWMON,
.driver = {
.name = "max6650",
},
.attach_adapter = max6650_attach_adapter,
.detach_client = max6650_detach_client,
.probe = max6650_probe,
.remove = max6650_remove,
.id_table = max6650_id,
.detect = max6650_detect,
.address_data = &addr_data,
};
/*
@ -128,7 +140,6 @@ static struct i2c_driver max6650_driver = {
struct max6650_data
{
struct i2c_client client;
struct device *hwmon_dev;
struct mutex update_lock;
char valid; /* zero until following fields are valid */
@ -437,47 +448,21 @@ static struct attribute_group max6650_attr_grp = {
* Real code
*/
static int max6650_attach_adapter(struct i2c_adapter *adapter)
/* Return 0 if detection is successful, -ENODEV otherwise */
static int max6650_detect(struct i2c_client *client, int kind,
struct i2c_board_info *info)
{
if (!(adapter->class & I2C_CLASS_HWMON)) {
dev_dbg(&adapter->dev,
"FATAL: max6650_attach_adapter class HWMON not set\n");
return 0;
}
return i2c_probe(adapter, &addr_data, max6650_detect);
}
/*
* The following function does more than just detection. If detection
* succeeds, it also registers the new chip.
*/
static int max6650_detect(struct i2c_adapter *adapter, int address, int kind)
{
struct i2c_client *client;
struct max6650_data *data;
int err = -ENODEV;
struct i2c_adapter *adapter = client->adapter;
int address = client->addr;
dev_dbg(&adapter->dev, "max6650_detect called, kind = %d\n", kind);
if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA)) {
dev_dbg(&adapter->dev, "max6650: I2C bus doesn't support "
"byte read mode, skipping.\n");
return 0;
return -ENODEV;
}
if (!(data = kzalloc(sizeof(struct max6650_data), GFP_KERNEL))) {
dev_err(&adapter->dev, "max6650: out of memory.\n");
return -ENOMEM;
}
client = &data->client;
i2c_set_clientdata(client, data);
client->addr = address;
client->adapter = adapter;
client->driver = &max6650_driver;
/*
* Now we do the remaining detection. A negative kind means that
* the driver was loaded with no force parameter (default), so we
@ -501,28 +486,40 @@ static int max6650_detect(struct i2c_adapter *adapter, int address, int kind)
||(i2c_smbus_read_byte_data(client, MAX6650_REG_COUNT) & 0xFC))) {
dev_dbg(&adapter->dev,
"max6650: detection failed at 0x%02x.\n", address);
goto err_free;
return -ENODEV;
}
dev_info(&adapter->dev, "max6650: chip found at 0x%02x.\n", address);
strlcpy(client->name, "max6650", I2C_NAME_SIZE);
mutex_init(&data->update_lock);
strlcpy(info->type, "max6650", I2C_NAME_SIZE);
if ((err = i2c_attach_client(client))) {
dev_err(&adapter->dev, "max6650: failed to attach client.\n");
goto err_free;
return 0;
}
static int max6650_probe(struct i2c_client *client,
const struct i2c_device_id *id)
{
struct max6650_data *data;
int err;
if (!(data = kzalloc(sizeof(struct max6650_data), GFP_KERNEL))) {
dev_err(&client->dev, "out of memory.\n");
return -ENOMEM;
}
i2c_set_clientdata(client, data);
mutex_init(&data->update_lock);
/*
* Initialize the max6650 chip
*/
if (max6650_init_client(client))
goto err_detach;
err = max6650_init_client(client);
if (err)
goto err_free;
err = sysfs_create_group(&client->dev.kobj, &max6650_attr_grp);
if (err)
goto err_detach;
goto err_free;
data->hwmon_dev = hwmon_device_register(&client->dev);
if (!IS_ERR(data->hwmon_dev))
@ -531,24 +528,19 @@ static int max6650_detect(struct i2c_adapter *adapter, int address, int kind)
err = PTR_ERR(data->hwmon_dev);
dev_err(&client->dev, "error registering hwmon device.\n");
sysfs_remove_group(&client->dev.kobj, &max6650_attr_grp);
err_detach:
i2c_detach_client(client);
err_free:
kfree(data);
return err;
}
static int max6650_detach_client(struct i2c_client *client)
static int max6650_remove(struct i2c_client *client)
{
struct max6650_data *data = i2c_get_clientdata(client);
int err;
sysfs_remove_group(&client->dev.kobj, &max6650_attr_grp);
hwmon_device_unregister(data->hwmon_dev);
err = i2c_detach_client(client);
if (!err)
kfree(data);
return err;
kfree(data);
return 0;
}
static int max6650_init_client(struct i2c_client *client)