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hwmon: (htu21) Convert to devm_hwmon_device_register_with_groups

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Use ATTRIBUTE_GROUPS macro and devm_hwmon_device_register_with_groups() to
simplify the code a bit.

Signed-off-by: Axel Lin <axel.lin@ingics.com>
Signed-off-by: Guenter Roeck <linux@roeck-us.net>
This commit is contained in:
Axel Lin 2014-06-29 15:00:59 +08:00 committed by Guenter Roeck
parent 7b3dadc4b3
commit fa0efc4091
1 changed files with 22 additions and 47 deletions
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69
drivers/hwmon/htu21.c
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@ -31,7 +31,7 @@
#define HTU21_RH_MEASUREMENT_HM 0xE5
struct htu21 {
struct device *hwmon_dev;
struct i2c_client *client;
struct mutex lock;
bool valid;
unsigned long last_update;
@ -59,10 +59,11 @@ static inline int htu21_rh_ticks_to_per_cent_mille(int ticks)
return ((15625 * ticks) >> 13) - 6000;
}
static int htu21_update_measurements(struct i2c_client *client)
static int htu21_update_measurements(struct device *dev)
{
struct htu21 *htu21 = dev_get_drvdata(dev);
struct i2c_client *client = htu21->client;
int ret = 0;
struct htu21 *htu21 = i2c_get_clientdata(client);
mutex_lock(&htu21->lock);
@ -90,9 +91,10 @@ out:
static ssize_t htu21_show_temperature(struct device *dev,
struct device_attribute *attr, char *buf)
{
struct i2c_client *client = to_i2c_client(dev);
struct htu21 *htu21 = i2c_get_clientdata(client);
int ret = htu21_update_measurements(client);
struct htu21 *htu21 = dev_get_drvdata(dev);
int ret;
ret = htu21_update_measurements(dev);
if (ret < 0)
return ret;
return sprintf(buf, "%d\n", htu21->temperature);
@ -101,9 +103,10 @@ static ssize_t htu21_show_temperature(struct device *dev,
static ssize_t htu21_show_humidity(struct device *dev,
struct device_attribute *attr, char *buf)
{
struct i2c_client *client = to_i2c_client(dev);
struct htu21 *htu21 = i2c_get_clientdata(client);
int ret = htu21_update_measurements(client);
struct htu21 *htu21 = dev_get_drvdata(dev);
int ret;
ret = htu21_update_measurements(dev);
if (ret < 0)
return ret;
return sprintf(buf, "%d\n", htu21->humidity);
@ -114,21 +117,20 @@ static SENSOR_DEVICE_ATTR(temp1_input, S_IRUGO,
static SENSOR_DEVICE_ATTR(humidity1_input, S_IRUGO,
htu21_show_humidity, NULL, 0);
static struct attribute *htu21_attributes[] = {
static struct attribute *htu21_attrs[] = {
&sensor_dev_attr_temp1_input.dev_attr.attr,
&sensor_dev_attr_humidity1_input.dev_attr.attr,
NULL
};
static const struct attribute_group htu21_group = {
.attrs = htu21_attributes,
};
ATTRIBUTE_GROUPS(htu21);
static int htu21_probe(struct i2c_client *client,
const struct i2c_device_id *id)
{
struct device *dev = &client->dev;
struct htu21 *htu21;
int err;
struct device *hwmon_dev;
if (!i2c_check_functionality(client->adapter,
I2C_FUNC_SMBUS_READ_WORD_DATA)) {
@ -137,43 +139,17 @@ static int htu21_probe(struct i2c_client *client,
return -ENODEV;
}
htu21 = devm_kzalloc(&client->dev, sizeof(*htu21), GFP_KERNEL);
htu21 = devm_kzalloc(dev, sizeof(*htu21), GFP_KERNEL);
if (!htu21)
return -ENOMEM;
i2c_set_clientdata(client, htu21);
htu21->client = client;
mutex_init(&htu21->lock);
err = sysfs_create_group(&client->dev.kobj, &htu21_group);
if (err) {
dev_dbg(&client->dev, "could not create sysfs files\n");
return err;
}
htu21->hwmon_dev = hwmon_device_register(&client->dev);
if (IS_ERR(htu21->hwmon_dev)) {
dev_dbg(&client->dev, "unable to register hwmon device\n");
err = PTR_ERR(htu21->hwmon_dev);
goto error;
}
dev_info(&client->dev, "initialized\n");
return 0;
error:
sysfs_remove_group(&client->dev.kobj, &htu21_group);
return err;
}
static int htu21_remove(struct i2c_client *client)
{
struct htu21 *htu21 = i2c_get_clientdata(client);
hwmon_device_unregister(htu21->hwmon_dev);
sysfs_remove_group(&client->dev.kobj, &htu21_group);
return 0;
hwmon_dev = devm_hwmon_device_register_with_groups(dev, client->name,
htu21,
htu21_groups);
return PTR_ERR_OR_ZERO(hwmon_dev);
}
static const struct i2c_device_id htu21_id[] = {
@ -188,7 +164,6 @@ static struct i2c_driver htu21_driver = {
.name = "htu21",
},
.probe = htu21_probe,
.remove = htu21_remove,
.id_table = htu21_id,
};