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hwmon: (lm87) Convert to a new-style i2c driver 

The new-style lm87 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: Ben Hutchings <bhutchings@solarflare.com>
This commit is contained in:
Jean Delvare 2008-07-16 19:30:14 +02:00 committed by Jean Delvare
parent b6aacdcefa
commit a888420af0
1 changed files with 46 additions and 53 deletions
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99
drivers/hwmon/lm87.c
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@ -5,7 +5,7 @@
* Philip Edelbrock <phil@netroedge.com>
* Stephen Rousset <stephen.rousset@rocketlogix.com>
* Dan Eaton <dan.eaton@rocketlogix.com>
* Copyright (C) 2004,2007 Jean Delvare <khali@linux-fr.org>
* Copyright (C) 2004-2008 Jean Delvare <khali@linux-fr.org>
*
* Original port to Linux 2.6 by Jeff Oliver.
*
@ -157,22 +157,35 @@ static u8 LM87_REG_TEMP_LOW[3] = { 0x3A, 0x38, 0x2C };
* Functions declaration
*/
static int lm87_attach_adapter(struct i2c_adapter *adapter);
static int lm87_detect(struct i2c_adapter *adapter, int address, int kind);
static int lm87_probe(struct i2c_client *client,
const struct i2c_device_id *id);
static int lm87_detect(struct i2c_client *new_client, int kind,
struct i2c_board_info *info);
static void lm87_init_client(struct i2c_client *client);
static int lm87_detach_client(struct i2c_client *client);
static int lm87_remove(struct i2c_client *client);
static struct lm87_data *lm87_update_device(struct device *dev);
/*
* Driver data (common to all clients)
*/
static const struct i2c_device_id lm87_id[] = {
{ "lm87", lm87 },
{ "adm1024", adm1024 },
{ }
};
MODULE_DEVICE_TABLE(i2c, lm87_id);
static struct i2c_driver lm87_driver = {
.class = I2C_CLASS_HWMON,
.driver = {
.name = "lm87",
},
.attach_adapter = lm87_attach_adapter,
.detach_client = lm87_detach_client,
.probe = lm87_probe,
.remove = lm87_remove,
.id_table = lm87_id,
.detect = lm87_detect,
.address_data = &addr_data,
};
/*
@ -180,7 +193,6 @@ static struct i2c_driver lm87_driver = {
*/
struct lm87_data {
struct i2c_client client;
struct device *hwmon_dev;
struct mutex update_lock;
char valid; /* zero until following fields are valid */
@ -562,13 +574,6 @@ static SENSOR_DEVICE_ATTR(temp3_fault, S_IRUGO, show_alarm, NULL, 15);
* Real code
*/
static int lm87_attach_adapter(struct i2c_adapter *adapter)
{
if (!(adapter->class & I2C_CLASS_HWMON))
return 0;
return i2c_probe(adapter, &addr_data, lm87_detect);
}
static struct attribute *lm87_attributes[] = {
&dev_attr_in1_input.attr,
&dev_attr_in1_min.attr,
@ -656,33 +661,15 @@ static const struct attribute_group lm87_group_opt = {
.attrs = lm87_attributes_opt,
};
/*
* The following function does more than just detection. If detection
* succeeds, it also registers the new chip.
*/
static int lm87_detect(struct i2c_adapter *adapter, int address, int kind)
/* Return 0 if detection is successful, -ENODEV otherwise */
static int lm87_detect(struct i2c_client *new_client, int kind,
struct i2c_board_info *info)
{
struct i2c_client *new_client;
struct lm87_data *data;
int err = 0;
struct i2c_adapter *adapter = new_client->adapter;
static const char *names[] = { "lm87", "adm1024" };
if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA))
goto exit;
if (!(data = kzalloc(sizeof(struct lm87_data), GFP_KERNEL))) {
err = -ENOMEM;
goto exit;
}
/* The common I2C client data is placed right before the
LM87-specific data. */
new_client = &data->client;
i2c_set_clientdata(new_client, data);
new_client->addr = address;
new_client->adapter = adapter;
new_client->driver = &lm87_driver;
new_client->flags = 0;
return -ENODEV;
/* Default to an LM87 if forced */
if (kind == 0)
@ -704,20 +691,32 @@ static int lm87_detect(struct i2c_adapter *adapter, int address, int kind)
|| (lm87_read_value(new_client, LM87_REG_CONFIG) & 0x80)) {
dev_dbg(&adapter->dev,
"LM87 detection failed at 0x%02x.\n",
address);
goto exit_free;
new_client->addr);
return -ENODEV;
}
}
/* We can fill in the remaining client fields */
strlcpy(new_client->name, names[kind - 1], I2C_NAME_SIZE);
strlcpy(info->type, names[kind - 1], I2C_NAME_SIZE);
return 0;
}
static int lm87_probe(struct i2c_client *new_client,
const struct i2c_device_id *id)
{
struct lm87_data *data;
int err;
data = kzalloc(sizeof(struct lm87_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;
/* Initialize the LM87 chip */
lm87_init_client(new_client);
@ -732,7 +731,7 @@ static int lm87_detect(struct i2c_adapter *adapter, int address, int kind)
/* Register sysfs hooks */
if ((err = sysfs_create_group(&new_client->dev.kobj, &lm87_group)))
goto exit_detach;
goto exit_free;
if (data->channel & CHAN_NO_FAN(0)) {
if ((err = device_create_file(&new_client->dev,
@ -832,8 +831,6 @@ static int lm87_detect(struct i2c_adapter *adapter, int address, int kind)
exit_remove:
sysfs_remove_group(&new_client->dev.kobj, &lm87_group);
sysfs_remove_group(&new_client->dev.kobj, &lm87_group_opt);
exit_detach:
i2c_detach_client(new_client);
exit_free:
kfree(data);
exit:
@ -877,18 +874,14 @@ static void lm87_init_client(struct i2c_client *client)
}
}
static int lm87_detach_client(struct i2c_client *client)
static int lm87_remove(struct i2c_client *client)
{
struct lm87_data *data = i2c_get_clientdata(client);
int err;
hwmon_device_unregister(data->hwmon_dev);
sysfs_remove_group(&client->dev.kobj, &lm87_group);
sysfs_remove_group(&client->dev.kobj, &lm87_group_opt);
if ((err = i2c_detach_client(client)))
return err;
kfree(data);
return 0;
}