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hwmon: (ds1621) Convert to a new-style i2c driver 

The new-style ds1621 driver implements the optional detect() callback
to cover the use cases of the legacy driver.

Signed-off-by: Jean Delvare <khali@linux-fr.org>
hifive-unleashed-5.1
Jean Delvare 2008-07-16 19:30:11 +02:00 committed by Jean Delvare
parent 71163c7c36
commit 70313eabfc
1 changed files with 47 additions and 52 deletions
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99
drivers/hwmon/ds1621.c
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@ -72,7 +72,6 @@ static const u8 DS1621_REG_TEMP[3] = {
/* Each client has this additional data */
struct ds1621_data {
struct i2c_client client;
struct device *hwmon_dev;
struct mutex update_lock;
char valid; /* !=0 if following fields are valid */
@ -82,20 +81,32 @@ struct ds1621_data {
u8 conf; /* Register encoding, combined */
};
static int ds1621_attach_adapter(struct i2c_adapter *adapter);
static int ds1621_detect(struct i2c_adapter *adapter, int address,
int kind);
static int ds1621_probe(struct i2c_client *client,
const struct i2c_device_id *id);
static int ds1621_detect(struct i2c_client *client, int kind,
struct i2c_board_info *info);
static void ds1621_init_client(struct i2c_client *client);
static int ds1621_detach_client(struct i2c_client *client);
static int ds1621_remove(struct i2c_client *client);
static struct ds1621_data *ds1621_update_client(struct device *dev);
static const struct i2c_device_id ds1621_id[] = {
{ "ds1621", ds1621 },
{ "ds1625", ds1621 },
{ }
};
MODULE_DEVICE_TABLE(i2c, ds1621_id);
/* This is the driver that will be inserted */
static struct i2c_driver ds1621_driver = {
.class = I2C_CLASS_HWMON,
.driver = {
.name = "ds1621",
},
.attach_adapter = ds1621_attach_adapter,
.detach_client = ds1621_detach_client,
.probe = ds1621_probe,
.remove = ds1621_remove,
.id_table = ds1621_id,
.detect = ds1621_detect,
.address_data = &addr_data,
};
/* All registers are word-sized, except for the configuration register.
@ -199,40 +210,18 @@ static const struct attribute_group ds1621_group = {
};
static int ds1621_attach_adapter(struct i2c_adapter *adapter)
{
if (!(adapter->class & I2C_CLASS_HWMON))
return 0;
return i2c_probe(adapter, &addr_data, ds1621_detect);
}
/* This function is called by i2c_probe */
static int ds1621_detect(struct i2c_adapter *adapter, int address,
int kind)
/* Return 0 if detection is successful, -ENODEV otherwise */
static int ds1621_detect(struct i2c_client *client, int kind,
struct i2c_board_info *info)
{
struct i2c_adapter *adapter = client->adapter;
int conf, temp;
struct i2c_client *client;
struct ds1621_data *data;
int i, err = 0;
int i;
if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA
| I2C_FUNC_SMBUS_WORD_DATA
| I2C_FUNC_SMBUS_WRITE_BYTE))
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 ds1621_{read,write}_value. */
if (!(data = kzalloc(sizeof(struct ds1621_data), GFP_KERNEL))) {
err = -ENOMEM;
goto exit;
}
client = &data->client;
i2c_set_clientdata(client, data);
client->addr = address;
client->adapter = adapter;
client->driver = &ds1621_driver;
return -ENODEV;
/* Now, we do the remaining detection. It is lousy. */
if (kind < 0) {
@ -241,29 +230,41 @@ static int ds1621_detect(struct i2c_adapter *adapter, int address,
improbable in our case. */
conf = ds1621_read_value(client, DS1621_REG_CONF);
if (conf & DS1621_REG_CONFIG_NVB)
goto exit_free;
return -ENODEV;
/* The 7 lowest bits of a temperature should always be 0. */
for (i = 0; i < ARRAY_SIZE(data->temp); i++) {
for (i = 0; i < ARRAY_SIZE(DS1621_REG_TEMP); i++) {
temp = ds1621_read_value(client, DS1621_REG_TEMP[i]);
if (temp & 0x007f)
goto exit_free;
return -ENODEV;
}
}
/* Fill in remaining client fields and put it into the global list */
strlcpy(client->name, "ds1621", I2C_NAME_SIZE);
mutex_init(&data->update_lock);
strlcpy(info->type, "ds1621", 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 ds1621_probe(struct i2c_client *client,
const struct i2c_device_id *id)
{
struct ds1621_data *data;
int err;
data = kzalloc(sizeof(struct ds1621_data), GFP_KERNEL);
if (!data) {
err = -ENOMEM;
goto exit;
}
i2c_set_clientdata(client, data);
mutex_init(&data->update_lock);
/* Initialize the DS1621 chip */
ds1621_init_client(client);
/* Register sysfs hooks */
if ((err = sysfs_create_group(&client->dev.kobj, &ds1621_group)))
goto exit_detach;
goto exit_free;
data->hwmon_dev = hwmon_device_register(&client->dev);
if (IS_ERR(data->hwmon_dev)) {
@ -275,25 +276,19 @@ static int ds1621_detect(struct i2c_adapter *adapter, int address,
exit_remove_files:
sysfs_remove_group(&client->dev.kobj, &ds1621_group);
exit_detach:
i2c_detach_client(client);
exit_free:
kfree(data);
exit:
return err;
}
static int ds1621_detach_client(struct i2c_client *client)
static int ds1621_remove(struct i2c_client *client)
{
struct ds1621_data *data = i2c_get_clientdata(client);
int err;
hwmon_device_unregister(data->hwmon_dev);
sysfs_remove_group(&client->dev.kobj, &ds1621_group);
if ((err = i2c_detach_client(client)))
return err;
kfree(data);
return 0;