hwmon: (ad7414) Convert to devm_hwmon_device_register_with_groups

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>

1 files changed, 16 insertions, 41 deletions

diff --git a/drivers/hwmon/ad7414.c b/drivers/hwmon/ad7414.c
index 5d501adc3e54..763490acc0df 100644
--- a/drivers/hwmon/ad7414.c
+++ b/drivers/hwmon/ad7414.c
@@ -39,7 +39,7 @@
 static u8 AD7414_REG_LIMIT[] = { AD7414_REG_T_HIGH, AD7414_REG_T_LOW };
 
 struct ad7414_data {
-        struct device           *hwmon_dev;
+        struct i2c_client       *client;
         struct mutex            lock;   /* atomic read data updates */
         char                    valid;  /* !=0 if following fields are valid */
         unsigned long           next_update;    /* In jiffies */
@@ -72,8 +72,8 @@ static inline int ad7414_write(struct i2c_client *client, u8 reg, u8 value)
 
 static struct ad7414_data *ad7414_update_device(struct device *dev)
 {
-        struct i2c_client *client = to_i2c_client(dev);
-        struct ad7414_data *data = i2c_get_clientdata(client);
+        struct ad7414_data *data = dev_get_drvdata(dev);
+        struct i2c_client *client = data->client;
 
         mutex_lock(&data->lock);
 
@@ -127,8 +127,8 @@ static ssize_t set_max_min(struct device *dev,
                            struct device_attribute *attr,
                            const char *buf, size_t count)
 {
-        struct i2c_client *client = to_i2c_client(dev);
-        struct ad7414_data *data = i2c_get_clientdata(client);
+        struct ad7414_data *data = dev_get_drvdata(dev);
+        struct i2c_client *client = data->client;
         int index = to_sensor_dev_attr(attr)->index;
         u8 reg = AD7414_REG_LIMIT[index];
         long temp;
@@ -164,7 +164,7 @@ static ssize_t show_alarm(struct device *dev, struct device_attribute *attr,
 static SENSOR_DEVICE_ATTR(temp1_min_alarm, S_IRUGO, show_alarm, NULL, 3);
 static SENSOR_DEVICE_ATTR(temp1_max_alarm, S_IRUGO, show_alarm, NULL, 4);
 
-static struct attribute *ad7414_attributes[] = {
+static struct attribute *ad7414_attrs[] = {
         &sensor_dev_attr_temp1_input.dev_attr.attr,
         &sensor_dev_attr_temp1_max.dev_attr.attr,
         &sensor_dev_attr_temp1_min.dev_attr.attr,
@@ -173,27 +173,25 @@ static struct attribute *ad7414_attributes[] = {
         NULL
 };
 
-static const struct attribute_group ad7414_group = {
-        .attrs = ad7414_attributes,
-};
+ATTRIBUTE_GROUPS(ad7414);
 
 static int ad7414_probe(struct i2c_client *client,
                         const struct i2c_device_id *dev_id)
 {
+        struct device *dev = &client->dev;
         struct ad7414_data *data;
+        struct device *hwmon_dev;
         int conf;
-        int err;
 
         if (!i2c_check_functionality(client->adapter, I2C_FUNC_SMBUS_BYTE_DATA |
                                      I2C_FUNC_SMBUS_READ_WORD_DATA))
                 return -EOPNOTSUPP;
 
-        data = devm_kzalloc(&client->dev, sizeof(struct ad7414_data),
-                            GFP_KERNEL);
+        data = devm_kzalloc(dev, sizeof(struct ad7414_data), GFP_KERNEL);
         if (!data)
                 return -ENOMEM;
 
-        i2c_set_clientdata(client, data);
+        data->client = client;
         mutex_init(&data->lock);
 
         dev_info(&client->dev, "chip found\n");
@@ -201,38 +199,16 @@ static int ad7414_probe(struct i2c_client *client,
         /* Make sure the chip is powered up. */
         conf = i2c_smbus_read_byte_data(client, AD7414_REG_CONF);
         if (conf < 0)
-                dev_warn(&client->dev,
-                         "ad7414_probe unable to read config register.\n");
+                dev_warn(dev, "ad7414_probe unable to read config register.\n");
         else {
                 conf &= ~(1 << 7);
                 i2c_smbus_write_byte_data(client, AD7414_REG_CONF, conf);
         }
 
-        /* Register sysfs hooks */
-        err = sysfs_create_group(&client->dev.kobj, &ad7414_group);
-        if (err)
-                return err;
-
-        data->hwmon_dev = hwmon_device_register(&client->dev);
-        if (IS_ERR(data->hwmon_dev)) {
-                err = PTR_ERR(data->hwmon_dev);
-                goto exit_remove;
-        }
-
-        return 0;
-
-exit_remove:
-        sysfs_remove_group(&client->dev.kobj, &ad7414_group);
-        return err;
-}
-
-static int ad7414_remove(struct i2c_client *client)
-{
-        struct ad7414_data *data = i2c_get_clientdata(client);
-
-        hwmon_device_unregister(data->hwmon_dev);
-        sysfs_remove_group(&client->dev.kobj, &ad7414_group);
-        return 0;
+        hwmon_dev = devm_hwmon_device_register_with_groups(dev,
+                                                           client->name,
+                                                           data, ad7414_groups);
+        return PTR_ERR_OR_ZERO(hwmon_dev);
 }
 
 static const struct i2c_device_id ad7414_id[] = {
@@ -246,7 +222,6 @@ static struct i2c_driver ad7414_driver = {
                 .name   = "ad7414",
         },
         .probe  = ad7414_probe,
-        .remove = ad7414_remove,
         .id_table = ad7414_id,
 };