hwmon: (lm77) Convert to use devm_hwmon_device_register_with_groups

Use devm_hwmon_device_register_with_groups API to attach attributes
to hwmon device, simplify code, and reduce code size.

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

1 files changed, 14 insertions, 39 deletions

diff --git a/drivers/hwmon/lm77.c b/drivers/hwmon/lm77.c
index ab1752a5b46f..5ceb443b938d 100644
--- a/drivers/hwmon/lm77.c
+++ b/drivers/hwmon/lm77.c
@@ -62,7 +62,7 @@ static const u8 temp_regs[t_num_temp] = {
 
 /* Each client has this additional data */
 struct lm77_data {
-        struct device           *hwmon_dev;
+        struct i2c_client       *client;
         struct mutex            update_lock;
         char                    valid;
         unsigned long           last_updated;   /* In jiffies */
@@ -111,8 +111,8 @@ static int lm77_write_value(struct i2c_client *client, u8 reg, u16 value)
 
 static struct lm77_data *lm77_update_device(struct device *dev)
 {
-        struct i2c_client *client = to_i2c_client(dev);
-        struct lm77_data *data = i2c_get_clientdata(client);
+        struct lm77_data *data = dev_get_drvdata(dev);
+        struct i2c_client *client = data->client;
         int i;
 
         mutex_lock(&data->update_lock);
@@ -165,8 +165,8 @@ static ssize_t set_temp(struct device *dev, struct device_attribute *devattr,
                         const char *buf, size_t count)
 {
         struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
-        struct i2c_client *client = to_i2c_client(dev);
-        struct lm77_data *data = i2c_get_clientdata(client);
+        struct lm77_data *data = dev_get_drvdata(dev);
+        struct i2c_client *client = data->client;
         int nr = attr->index;
         long val;
         int err;
@@ -190,8 +190,8 @@ static ssize_t set_temp_hyst(struct device *dev,
                              struct device_attribute *devattr,
                              const char *buf, size_t count)
 {
-        struct i2c_client *client = to_i2c_client(dev);
-        struct lm77_data *data = i2c_get_clientdata(client);
+        struct lm77_data *data = dev_get_drvdata(dev);
+        struct i2c_client *client = data->client;
         unsigned long val;
         int err;
 
@@ -232,7 +232,7 @@ static SENSOR_DEVICE_ATTR(temp1_crit_alarm, S_IRUGO, show_alarm, NULL, 2);
 static SENSOR_DEVICE_ATTR(temp1_min_alarm, S_IRUGO, show_alarm, NULL, 0);
 static SENSOR_DEVICE_ATTR(temp1_max_alarm, S_IRUGO, show_alarm, NULL, 1);
 
-static struct attribute *lm77_attributes[] = {
+static struct attribute *lm77_attrs[] = {
         &sensor_dev_attr_temp1_input.dev_attr.attr,
         &sensor_dev_attr_temp1_crit.dev_attr.attr,
         &sensor_dev_attr_temp1_min.dev_attr.attr,
@@ -245,10 +245,7 @@ static struct attribute *lm77_attributes[] = {
         &sensor_dev_attr_temp1_max_alarm.dev_attr.attr,
         NULL
 };
-
-static const struct attribute_group lm77_group = {
-        .attrs = lm77_attributes,
-};
+ATTRIBUTE_GROUPS(lm77);
 
 /* Return 0 if detection is successful, -ENODEV otherwise */
 static int lm77_detect(struct i2c_client *client, struct i2c_board_info *info)
@@ -332,43 +329,22 @@ static void lm77_init_client(struct i2c_client *client)
 static int lm77_probe(struct i2c_client *client, const struct i2c_device_id *id)
 {
         struct device *dev = &client->dev;
+        struct device *hwmon_dev;
         struct lm77_data *data;
-        int err;
 
         data = devm_kzalloc(dev, sizeof(struct lm77_data), GFP_KERNEL);
         if (!data)
                 return -ENOMEM;
 
-        i2c_set_clientdata(client, data);
+        data->client = client;
         mutex_init(&data->update_lock);
 
         /* Initialize the LM77 chip */
         lm77_init_client(client);
 
-        /* Register sysfs hooks */
-        err = sysfs_create_group(&dev->kobj, &lm77_group);
-        if (err)
-                return err;
-
-        data->hwmon_dev = hwmon_device_register(dev);
-        if (IS_ERR(data->hwmon_dev)) {
-                err = PTR_ERR(data->hwmon_dev);
-                goto exit_remove;
-        }
-
-        return 0;
-
-exit_remove:
-        sysfs_remove_group(&dev->kobj, &lm77_group);
-        return err;
-}
-
-static int lm77_remove(struct i2c_client *client)
-{
-        struct lm77_data *data = i2c_get_clientdata(client);
-        hwmon_device_unregister(data->hwmon_dev);
-        sysfs_remove_group(&client->dev.kobj, &lm77_group);
-        return 0;
+        hwmon_dev = devm_hwmon_device_register_with_groups(dev, client->name,
+                                                           data, lm77_groups);
+        return PTR_ERR_OR_ZERO(hwmon_dev);
 }
 
 static const struct i2c_device_id lm77_id[] = {
@@ -384,7 +360,6 @@ static struct i2c_driver lm77_driver = {
                 .name   = "lm77",
         },
         .probe          = lm77_probe,
-        .remove         = lm77_remove,
         .id_table       = lm77_id,
         .detect         = lm77_detect,
         .address_list   = normal_i2c,