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hwmon: (gl518sm) Convert to a new-style i2c driver 

The new-style gl518sm 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 19:30:13 +02:00 committed by Jean Delvare
parent b9e39b1b1b
commit 95d80e7c83
1 changed files with 47 additions and 52 deletions
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99
drivers/hwmon/gl518sm.c
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@ -114,7 +114,6 @@ static inline u8 FAN_TO_REG(long rpm, int div)
/* Each client has this additional data */
struct gl518_data {
struct i2c_client client;
struct device *hwmon_dev;
enum chips type;
@ -138,21 +137,33 @@ struct gl518_data {
u8 beep_enable; /* Boolean */
};
static int gl518_attach_adapter(struct i2c_adapter *adapter);
static int gl518_detect(struct i2c_adapter *adapter, int address, int kind);
static int gl518_probe(struct i2c_client *client,
const struct i2c_device_id *id);
static int gl518_detect(struct i2c_client *client, int kind,
struct i2c_board_info *info);
static void gl518_init_client(struct i2c_client *client);
static int gl518_detach_client(struct i2c_client *client);
static int gl518_remove(struct i2c_client *client);
static int gl518_read_value(struct i2c_client *client, u8 reg);
static int gl518_write_value(struct i2c_client *client, u8 reg, u16 value);
static struct gl518_data *gl518_update_device(struct device *dev);
static const struct i2c_device_id gl518_id[] = {
{ "gl518sm", 0 },
{ }
};
MODULE_DEVICE_TABLE(i2c, gl518_id);
/* This is the driver that will be inserted */
static struct i2c_driver gl518_driver = {
.class = I2C_CLASS_HWMON,
.driver = {
.name = "gl518sm",
},
.attach_adapter = gl518_attach_adapter,
.detach_client = gl518_detach_client,
.probe = gl518_probe,
.remove = gl518_remove,
.id_table = gl518_id,
.detect = gl518_detect,
.address_data = &addr_data,
};
/*
@ -472,46 +483,23 @@ static const struct attribute_group gl518_group_r80 = {
* Real code
*/
static int gl518_attach_adapter(struct i2c_adapter *adapter)
{
if (!(adapter->class & I2C_CLASS_HWMON))
return 0;
return i2c_probe(adapter, &addr_data, gl518_detect);
}
static int gl518_detect(struct i2c_adapter *adapter, int address, int kind)
/* Return 0 if detection is successful, -ENODEV otherwise */
static int gl518_detect(struct i2c_client *client, int kind,
struct i2c_board_info *info)
{
struct i2c_adapter *adapter = client->adapter;
int i;
struct i2c_client *client;
struct gl518_data *data;
int err = 0;
if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA |
I2C_FUNC_SMBUS_WORD_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 gl518_{read,write}_value. */
if (!(data = kzalloc(sizeof(struct gl518_data), GFP_KERNEL))) {
err = -ENOMEM;
goto exit;
}
client = &data->client;
i2c_set_clientdata(client, data);
client->addr = address;
client->adapter = adapter;
client->driver = &gl518_driver;
return -ENODEV;
/* Now, we do the remaining detection. */
if (kind < 0) {
if ((gl518_read_value(client, GL518_REG_CHIP_ID) != 0x80)
|| (gl518_read_value(client, GL518_REG_CONF) & 0x80))
goto exit_free;
return -ENODEV;
}
/* Determine the chip type. */
@ -526,19 +514,32 @@ static int gl518_detect(struct i2c_adapter *adapter, int address, int kind)
dev_info(&adapter->dev,
"Ignoring 'force' parameter for unknown "
"chip at adapter %d, address 0x%02x\n",
i2c_adapter_id(adapter), address);
goto exit_free;
i2c_adapter_id(adapter), client->addr);
return -ENODEV;
}
}
/* Fill in the remaining client fields */
strlcpy(client->name, "gl518sm", I2C_NAME_SIZE);
data->type = kind;
mutex_init(&data->update_lock);
strlcpy(info->type, "gl518sm", 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 gl518_probe(struct i2c_client *client,
const struct i2c_device_id *id)
{
struct gl518_data *data;
int err, revision;
data = kzalloc(sizeof(struct gl518_data), GFP_KERNEL);
if (!data) {
err = -ENOMEM;
goto exit;
}
i2c_set_clientdata(client, data);
revision = gl518_read_value(client, GL518_REG_REVISION);
data->type = revision == 0x80 ? gl518sm_r80 : gl518sm_r00;
mutex_init(&data->update_lock);
/* Initialize the GL518SM chip */
data->alarm_mask = 0xff;
@ -546,7 +547,7 @@ static int gl518_detect(struct i2c_adapter *adapter, int address, int kind)
/* Register sysfs hooks */
if ((err = sysfs_create_group(&client->dev.kobj, &gl518_group)))
goto exit_detach;
goto exit_free;
if (data->type == gl518sm_r80)
if ((err = sysfs_create_group(&client->dev.kobj,
&gl518_group_r80)))
@ -564,8 +565,6 @@ exit_remove_files:
sysfs_remove_group(&client->dev.kobj, &gl518_group);
if (data->type == gl518sm_r80)
sysfs_remove_group(&client->dev.kobj, &gl518_group_r80);
exit_detach:
i2c_detach_client(client);
exit_free:
kfree(data);
exit:
@ -591,19 +590,15 @@ static void gl518_init_client(struct i2c_client *client)
gl518_write_value(client, GL518_REG_CONF, 0x40 | regvalue);
}
static int gl518_detach_client(struct i2c_client *client)
static int gl518_remove(struct i2c_client *client)
{
struct gl518_data *data = i2c_get_clientdata(client);
int err;
hwmon_device_unregister(data->hwmon_dev);
sysfs_remove_group(&client->dev.kobj, &gl518_group);
if (data->type == gl518sm_r80)
sysfs_remove_group(&client->dev.kobj, &gl518_group_r80);
if ((err = i2c_detach_client(client)))
return err;
kfree(data);
return 0;
}