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hwmon: (lm80) Convert to a new-style i2c driver 

The new-style lm80 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 19:30:14 +02:00 committed by Jean Delvare
parent a189dd62d3
commit 8c8bacc883
1 changed files with 43 additions and 51 deletions
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94
drivers/hwmon/lm80.c
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@ -108,7 +108,6 @@ static inline long TEMP_FROM_REG(u16 temp)
*/
struct lm80_data {
struct i2c_client client;
struct device *hwmon_dev;
struct mutex update_lock;
char valid; /* !=0 if following fields are valid */
@ -132,10 +131,12 @@ struct lm80_data {
* Functions declaration
*/
static int lm80_attach_adapter(struct i2c_adapter *adapter);
static int lm80_detect(struct i2c_adapter *adapter, int address, int kind);
static int lm80_probe(struct i2c_client *client,
const struct i2c_device_id *id);
static int lm80_detect(struct i2c_client *client, int kind,
struct i2c_board_info *info);
static void lm80_init_client(struct i2c_client *client);
static int lm80_detach_client(struct i2c_client *client);
static int lm80_remove(struct i2c_client *client);
static struct lm80_data *lm80_update_device(struct device *dev);
static int lm80_read_value(struct i2c_client *client, u8 reg);
static int lm80_write_value(struct i2c_client *client, u8 reg, u8 value);
@ -144,12 +145,22 @@ static int lm80_write_value(struct i2c_client *client, u8 reg, u8 value);
* Driver data (common to all clients)
*/
static const struct i2c_device_id lm80_id[] = {
{ "lm80", lm80 },
{ }
};
MODULE_DEVICE_TABLE(i2c, lm80_id);
static struct i2c_driver lm80_driver = {
.class = I2C_CLASS_HWMON,
.driver = {
.name = "lm80",
},
.attach_adapter = lm80_attach_adapter,
.detach_client = lm80_detach_client,
.probe = lm80_probe,
.remove = lm80_remove,
.id_table = lm80_id,
.detect = lm80_detect,
.address_data = &addr_data,
};
/*
@ -383,13 +394,6 @@ static SENSOR_DEVICE_ATTR(temp1_crit_alarm, S_IRUGO, show_alarm, NULL, 13);
* Real code
*/
static int lm80_attach_adapter(struct i2c_adapter *adapter)
{
if (!(adapter->class & I2C_CLASS_HWMON))
return 0;
return i2c_probe(adapter, &addr_data, lm80_detect);
}
static struct attribute *lm80_attributes[] = {
&sensor_dev_attr_in0_min.dev_attr.attr,
&sensor_dev_attr_in1_min.dev_attr.attr,
@ -442,54 +446,47 @@ static const struct attribute_group lm80_group = {
.attrs = lm80_attributes,
};
static int lm80_detect(struct i2c_adapter *adapter, int address, int kind)
/* Return 0 if detection is successful, -ENODEV otherwise */
static int lm80_detect(struct i2c_client *client, int kind,
struct i2c_board_info *info)
{
struct i2c_adapter *adapter = client->adapter;
int i, cur;
struct i2c_client *client;
struct lm80_data *data;
int err = 0;
const char *name;
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 lm80_{read,write}_value. */
if (!(data = kzalloc(sizeof(struct lm80_data), GFP_KERNEL))) {
err = -ENOMEM;
goto exit;
}
client = &data->client;
i2c_set_clientdata(client, data);
client->addr = address;
client->adapter = adapter;
client->driver = &lm80_driver;
return -ENODEV;
/* Now, we do the remaining detection. It is lousy. */
if (lm80_read_value(client, LM80_REG_ALARM2) & 0xc0)
goto error_free;
return -ENODEV;
for (i = 0x2a; i <= 0x3d; i++) {
cur = i2c_smbus_read_byte_data(client, i);
if ((i2c_smbus_read_byte_data(client, i + 0x40) != cur)
|| (i2c_smbus_read_byte_data(client, i + 0x80) != cur)
|| (i2c_smbus_read_byte_data(client, i + 0xc0) != cur))
goto error_free;
return -ENODEV;
}
/* Determine the chip type - only one kind supported! */
kind = lm80;
name = "lm80";
strlcpy(info->type, "lm80", I2C_NAME_SIZE);
/* Fill in the remaining client fields */
strlcpy(client->name, name, I2C_NAME_SIZE);
return 0;
}
static int lm80_probe(struct i2c_client *client,
const struct i2c_device_id *id)
{
struct lm80_data *data;
int err;
data = kzalloc(sizeof(struct lm80_data), GFP_KERNEL);
if (!data) {
err = -ENOMEM;
goto exit;
}
i2c_set_clientdata(client, data);
mutex_init(&data->update_lock);
/* Tell the I2C layer a new client has arrived */
if ((err = i2c_attach_client(client)))
goto error_free;
/* Initialize the LM80 chip */
lm80_init_client(client);
@ -499,7 +496,7 @@ static int lm80_detect(struct i2c_adapter *adapter, int address, int kind)
/* Register sysfs hooks */
if ((err = sysfs_create_group(&client->dev.kobj, &lm80_group)))
goto error_detach;
goto error_free;
data->hwmon_dev = hwmon_device_register(&client->dev);
if (IS_ERR(data->hwmon_dev)) {
@ -511,23 +508,18 @@ static int lm80_detect(struct i2c_adapter *adapter, int address, int kind)
error_remove:
sysfs_remove_group(&client->dev.kobj, &lm80_group);
error_detach:
i2c_detach_client(client);
error_free:
kfree(data);
exit:
return err;
}
static int lm80_detach_client(struct i2c_client *client)
static int lm80_remove(struct i2c_client *client)
{
struct lm80_data *data = i2c_get_clientdata(client);
int err;
hwmon_device_unregister(data->hwmon_dev);
sysfs_remove_group(&client->dev.kobj, &lm80_group);
if ((err = i2c_detach_client(client)))
return err;
kfree(data);
return 0;