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hwmon: (adm1029) Convert to a new-style i2c driver
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The new-style adm1029 driver implements the optional detect() callback
to cover the use cases of the legacy driver.

Signed-off-by: Jean Delvare <[email protected]>
Cc: Corentin Labbe <[email protected]>
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Jean Delvare authored and Jean Delvare committed Jul 16, 2008
1 parent 57f7eb0 commit 9c97fb4
Showing 1 changed file with 44 additions and 53 deletions.
97 changes: 44 additions & 53 deletions drivers/hwmon/adm1029.c
Original file line number Diff line number Diff line change
@@ -115,30 +115,41 @@ static const u8 ADM1029_REG_FAN_DIV[] = {
* Functions declaration
*/

static int adm1029_attach_adapter(struct i2c_adapter *adapter);
static int adm1029_detect(struct i2c_adapter *adapter, int address, int kind);
static int adm1029_detach_client(struct i2c_client *client);
static int adm1029_probe(struct i2c_client *client,
const struct i2c_device_id *id);
static int adm1029_detect(struct i2c_client *client, int kind,
struct i2c_board_info *info);
static int adm1029_remove(struct i2c_client *client);
static struct adm1029_data *adm1029_update_device(struct device *dev);
static int adm1029_init_client(struct i2c_client *client);

/*
* Driver data (common to all clients)
*/

static const struct i2c_device_id adm1029_id[] = {
{ "adm1029", adm1029 },
{ }
};
MODULE_DEVICE_TABLE(i2c, adm1029_id);

static struct i2c_driver adm1029_driver = {
.class = I2C_CLASS_HWMON,
.driver = {
.name = "adm1029",
},
.attach_adapter = adm1029_attach_adapter,
.detach_client = adm1029_detach_client,
.probe = adm1029_probe,
.remove = adm1029_remove,
.id_table = adm1029_id,
.detect = adm1029_detect,
.address_data = &addr_data,
};

/*
* Client data (each client gets its own)
*/

struct adm1029_data {
struct i2c_client client;
struct device *hwmon_dev;
struct mutex update_lock;
char valid; /* zero until following fields are valid */
@@ -284,37 +295,14 @@ static const struct attribute_group adm1029_group = {
* Real code
*/

static int adm1029_attach_adapter(struct i2c_adapter *adapter)
/* Return 0 if detection is successful, -ENODEV otherwise */
static int adm1029_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, adm1029_detect);
}
struct i2c_adapter *adapter = client->adapter;

/*
* The following function does more than just detection. If detection
* succeeds, it also registers the new chip.
*/

static int adm1029_detect(struct i2c_adapter *adapter, int address, int kind)
{
struct i2c_client *client;
struct adm1029_data *data;
int err = 0;
const char *name = "";
if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA))
goto exit;

if (!(data = kzalloc(sizeof(struct adm1029_data), GFP_KERNEL))) {
err = -ENOMEM;
goto exit;
}

client = &data->client;
i2c_set_clientdata(client, data);
client->addr = address;
client->adapter = adapter;
client->driver = &adm1029_driver;
return -ENODEV;

/* Now we do the detection and identification. A negative kind
* means that the driver was loaded with no force parameter
@@ -362,32 +350,41 @@ static int adm1029_detect(struct i2c_adapter *adapter, int address, int kind)
if (kind <= 0) { /* identification failed */
pr_debug("adm1029: Unsupported chip (man_id=0x%02X, "
"chip_id=0x%02X)\n", man_id, chip_id);
goto exit_free;
return -ENODEV;
}
}
strlcpy(info->type, "adm1029", I2C_NAME_SIZE);

if (kind == adm1029) {
name = "adm1029";
return 0;
}

static int adm1029_probe(struct i2c_client *client,
const struct i2c_device_id *id)
{
struct adm1029_data *data;
int err;

data = kzalloc(sizeof(struct adm1029_data), GFP_KERNEL);
if (!data) {
err = -ENOMEM;
goto exit;
}

/* We can fill in the remaining client fields */
strlcpy(client->name, name, I2C_NAME_SIZE);
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 exit_free;

/*
* Initialize the ADM1029 chip
* Check config register
*/
if (adm1029_init_client(client) == 0)
goto exit_detach;
if (adm1029_init_client(client) == 0) {
err = -ENODEV;
goto exit_free;
}

/* Register sysfs hooks */
if ((err = sysfs_create_group(&client->dev.kobj, &adm1029_group)))
goto exit_detach;
goto exit_free;

data->hwmon_dev = hwmon_device_register(&client->dev);
if (IS_ERR(data->hwmon_dev)) {
@@ -399,8 +396,6 @@ static int adm1029_detect(struct i2c_adapter *adapter, int address, int kind)

exit_remove_files:
sysfs_remove_group(&client->dev.kobj, &adm1029_group);
exit_detach:
i2c_detach_client(client);
exit_free:
kfree(data);
exit:
@@ -424,17 +419,13 @@ static int adm1029_init_client(struct i2c_client *client)
return 1;
}

static int adm1029_detach_client(struct i2c_client *client)
static int adm1029_remove(struct i2c_client *client)
{
struct adm1029_data *data = i2c_get_clientdata(client);
int err;

hwmon_device_unregister(data->hwmon_dev);
sysfs_remove_group(&client->dev.kobj, &adm1029_group);

if ((err = i2c_detach_client(client)))
return err;

kfree(data);
return 0;
}

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