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hwmon: (adt7470) Convert to a new-style i2c driver

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The new-style adt7470 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: Darrick J. Wong <djwong@us.ibm.com>
This commit is contained in:
Jean Delvare 2008-07-16 19:30:10 +02:00 committed by Jean Delvare
parent 7347cb388e
commit 008f1ca51e
1 changed files with 48 additions and 52 deletions
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100
drivers/hwmon/adt7470.c
View file

@ -138,7 +138,6 @@ I2C_CLIENT_INSMOD_1(adt7470);
#define FAN_DATA_VALID(x) ((x) && (x) != FAN_PERIOD_INVALID)
struct adt7470_data {
struct i2c_client client;
struct device *hwmon_dev;
struct attribute_group attrs;
struct mutex lock;
@ -164,16 +163,28 @@ struct adt7470_data {
u8 pwm_auto_temp[ADT7470_PWM_COUNT];
};
static int adt7470_attach_adapter(struct i2c_adapter *adapter);
static int adt7470_detect(struct i2c_adapter *adapter, int address, int kind);
static int adt7470_detach_client(struct i2c_client *client);
static int adt7470_probe(struct i2c_client *client,
const struct i2c_device_id *id);
static int adt7470_detect(struct i2c_client *client, int kind,
struct i2c_board_info *info);
static int adt7470_remove(struct i2c_client *client);
static const struct i2c_device_id adt7470_id[] = {
{ "adt7470", adt7470 },
{ }
};
MODULE_DEVICE_TABLE(i2c, adt7470_id);
static struct i2c_driver adt7470_driver = {
.class = I2C_CLASS_HWMON,
.driver = {
.name = "adt7470",
},
.attach_adapter = adt7470_attach_adapter,
.detach_client = adt7470_detach_client,
.probe = adt7470_probe,
.remove = adt7470_remove,
.id_table = adt7470_id,
.detect = adt7470_detect,
.address_data = &addr_data,
};
/*
@ -1004,64 +1015,52 @@ static struct attribute *adt7470_attr[] =
NULL
};
static int adt7470_attach_adapter(struct i2c_adapter *adapter)
/* Return 0 if detection is successful, -ENODEV otherwise */
static int adt7470_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, adt7470_detect);
}
static int adt7470_detect(struct i2c_adapter *adapter, int address, int kind)
{
struct i2c_client *client;
struct adt7470_data *data;
int err = 0;
struct i2c_adapter *adapter = client->adapter;
if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA))
goto exit;
if (!(data = kzalloc(sizeof(struct adt7470_data), GFP_KERNEL))) {
err = -ENOMEM;
goto exit;
}
client = &data->client;
client->addr = address;
client->adapter = adapter;
client->driver = &adt7470_driver;
i2c_set_clientdata(client, data);
mutex_init(&data->lock);
return -ENODEV;
if (kind <= 0) {
int vendor, device, revision;
vendor = i2c_smbus_read_byte_data(client, ADT7470_REG_VENDOR);
if (vendor != ADT7470_VENDOR) {
err = -ENODEV;
goto exit_free;
}
if (vendor != ADT7470_VENDOR)
return -ENODEV;
device = i2c_smbus_read_byte_data(client, ADT7470_REG_DEVICE);
if (device != ADT7470_DEVICE) {
err = -ENODEV;
goto exit_free;
}
if (device != ADT7470_DEVICE)
return -ENODEV;
revision = i2c_smbus_read_byte_data(client,
ADT7470_REG_REVISION);
if (revision != ADT7470_REVISION) {
err = -ENODEV;
goto exit_free;
}
if (revision != ADT7470_REVISION)
return -ENODEV;
} else
dev_dbg(&adapter->dev, "detection forced\n");
strlcpy(client->name, "adt7470", I2C_NAME_SIZE);
strlcpy(info->type, "adt7470", I2C_NAME_SIZE);
if ((err = i2c_attach_client(client)))
goto exit_free;
return 0;
}
static int adt7470_probe(struct i2c_client *client,
const struct i2c_device_id *id)
{
struct adt7470_data *data;
int err;
data = kzalloc(sizeof(struct adt7470_data), GFP_KERNEL);
if (!data) {
err = -ENOMEM;
goto exit;
}
i2c_set_clientdata(client, data);
mutex_init(&data->lock);
dev_info(&client->dev, "%s chip found\n", client->name);
@ -1071,7 +1070,7 @@ static int adt7470_detect(struct i2c_adapter *adapter, int address, int kind)
/* Register sysfs hooks */
data->attrs.attrs = adt7470_attr;
if ((err = sysfs_create_group(&client->dev.kobj, &data->attrs)))
goto exit_detach;
goto exit_free;
data->hwmon_dev = hwmon_device_register(&client->dev);
if (IS_ERR(data->hwmon_dev)) {
@ -1083,21 +1082,18 @@ static int adt7470_detect(struct i2c_adapter *adapter, int address, int kind)
exit_remove:
sysfs_remove_group(&client->dev.kobj, &data->attrs);
exit_detach:
i2c_detach_client(client);
exit_free:
kfree(data);
exit:
return err;
}
static int adt7470_detach_client(struct i2c_client *client)
static int adt7470_remove(struct i2c_client *client)
{
struct adt7470_data *data = i2c_get_clientdata(client);
hwmon_device_unregister(data->hwmon_dev);
sysfs_remove_group(&client->dev.kobj, &data->attrs);
i2c_detach_client(client);
kfree(data);
return 0;
}