hwmon: (ltc4215) Convert to devm_hwmon_device_register_with_groups

Simplify code, reduce code size, and attach sysfs attributes to hwmon device.

Signed-off-by: Guenter Roeck <linux@roeck-us.net>
Reviewed-by: Jean Delvare <jdelvare@suse.de>

1 files changed, 13 insertions, 38 deletions

diff --git a/drivers/hwmon/ltc4215.c b/drivers/hwmon/ltc4215.c
index 8a142960d69e..c8a9bd9b050f 100644
--- a/drivers/hwmon/ltc4215.c
+++ b/drivers/hwmon/ltc4215.c
@@ -33,7 +33,7 @@ enum ltc4215_cmd {
 };
 
 struct ltc4215_data {
-        struct device *hwmon_dev;
+        struct i2c_client *client;
 
         struct mutex update_lock;
         bool valid;
@@ -45,8 +45,8 @@ struct ltc4215_data {
 
 static struct ltc4215_data *ltc4215_update_device(struct device *dev)
 {
-        struct i2c_client *client = to_i2c_client(dev);
-        struct ltc4215_data *data = i2c_get_clientdata(client);
+        struct ltc4215_data *data = dev_get_drvdata(dev);
+        struct i2c_client *client = data->client;
         s32 val;
         int i;
 
@@ -214,7 +214,7 @@ static SENSOR_DEVICE_ATTR(in2_min_alarm, S_IRUGO, ltc4215_show_alarm, NULL,
  * Finally, construct an array of pointers to members of the above objects,
  * as required for sysfs_create_group()
  */
-static struct attribute *ltc4215_attributes[] = {
+static struct attribute *ltc4215_attrs[] = {
         &sensor_dev_attr_curr1_input.dev_attr.attr,
         &sensor_dev_attr_curr1_max_alarm.dev_attr.attr,
 
@@ -229,57 +229,33 @@ static struct attribute *ltc4215_attributes[] = {
 
         NULL,
 };
-
-static const struct attribute_group ltc4215_group = {
-        .attrs = ltc4215_attributes,
-};
+ATTRIBUTE_GROUPS(ltc4215);
 
 static int ltc4215_probe(struct i2c_client *client,
                          const struct i2c_device_id *id)
 {
         struct i2c_adapter *adapter = client->adapter;
+        struct device *dev = &client->dev;
         struct ltc4215_data *data;
-        int ret;
+        struct device *hwmon_dev;
 
         if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA))
                 return -ENODEV;
 
-        data = devm_kzalloc(&client->dev, sizeof(*data), GFP_KERNEL);
+        data = devm_kzalloc(dev, sizeof(*data), GFP_KERNEL);
         if (!data)
                 return -ENOMEM;
 
-        i2c_set_clientdata(client, data);
+        data->client = client;
         mutex_init(&data->update_lock);
 
         /* Initialize the LTC4215 chip */
         i2c_smbus_write_byte_data(client, LTC4215_FAULT, 0x00);
 
-        /* Register sysfs hooks */
-        ret = sysfs_create_group(&client->dev.kobj, &ltc4215_group);
-        if (ret)
-                return ret;
-
-        data->hwmon_dev = hwmon_device_register(&client->dev);
-        if (IS_ERR(data->hwmon_dev)) {
-                ret = PTR_ERR(data->hwmon_dev);
-                goto out_hwmon_device_register;
-        }
-
-        return 0;
-
-out_hwmon_device_register:
-        sysfs_remove_group(&client->dev.kobj, &ltc4215_group);
-        return ret;
-}
-
-static int ltc4215_remove(struct i2c_client *client)
-{
-        struct ltc4215_data *data = i2c_get_clientdata(client);
-
-        hwmon_device_unregister(data->hwmon_dev);
-        sysfs_remove_group(&client->dev.kobj, &ltc4215_group);
-
-        return 0;
+        hwmon_dev = devm_hwmon_device_register_with_groups(dev, client->name,
+                                                           data,
+                                                           ltc4215_groups);
+        return PTR_ERR_OR_ZERO(hwmon_dev);
 }
 
 static const struct i2c_device_id ltc4215_id[] = {
@@ -294,7 +270,6 @@ static struct i2c_driver ltc4215_driver = {
                 .name   = "ltc4215",
         },
         .probe          = ltc4215_probe,
-        .remove         = ltc4215_remove,
         .id_table       = ltc4215_id,
 };