hwmon: (sht21) 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, 22 insertions, 60 deletions

diff --git a/drivers/hwmon/sht21.c b/drivers/hwmon/sht21.c
index 2e9f9570b6f8..84cdb1cf0fb4 100644
--- a/drivers/hwmon/sht21.c
+++ b/drivers/hwmon/sht21.c
@@ -45,7 +45,7 @@
  * @humidity: cached humidity measurement value
  */
 struct sht21 {
-        struct device *hwmon_dev;
+        struct i2c_client *client;
         struct mutex lock;
         char valid;
         unsigned long last_update;
@@ -85,14 +85,15 @@ static inline int sht21_rh_ticks_to_per_cent_mille(int ticks)
 
 /**
  * sht21_update_measurements() - get updated measurements from device
- * @client: I2C client device
+ * @dev: device
  *
  * Returns 0 on success, else negative errno.
  */
-static int sht21_update_measurements(struct i2c_client *client)
+static int sht21_update_measurements(struct device *dev)
 {
         int ret = 0;
-        struct sht21 *sht21 = i2c_get_clientdata(client);
+        struct sht21 *sht21 = dev_get_drvdata(dev);
+        struct i2c_client *client = sht21->client;
 
         mutex_lock(&sht21->lock);
         /*
@@ -133,9 +134,10 @@ static ssize_t sht21_show_temperature(struct device *dev,
         struct device_attribute *attr,
         char *buf)
 {
-        struct i2c_client *client = to_i2c_client(dev);
-        struct sht21 *sht21 = i2c_get_clientdata(client);
-        int ret = sht21_update_measurements(client);
+        struct sht21 *sht21 = dev_get_drvdata(dev);
+        int ret;
+
+        ret = sht21_update_measurements(dev);
         if (ret < 0)
                 return ret;
         return sprintf(buf, "%d\n", sht21->temperature);
@@ -154,9 +156,10 @@ static ssize_t sht21_show_humidity(struct device *dev,
         struct device_attribute *attr,
         char *buf)
 {
-        struct i2c_client *client = to_i2c_client(dev);
-        struct sht21 *sht21 = i2c_get_clientdata(client);
-        int ret = sht21_update_measurements(client);
+        struct sht21 *sht21 = dev_get_drvdata(dev);
+        int ret;
+
+        ret = sht21_update_measurements(dev);
         if (ret < 0)
                 return ret;
         return sprintf(buf, "%d\n", sht21->humidity);
@@ -168,30 +171,20 @@ static SENSOR_DEVICE_ATTR(temp1_input, S_IRUGO, sht21_show_temperature,
 static SENSOR_DEVICE_ATTR(humidity1_input, S_IRUGO, sht21_show_humidity,
         NULL, 0);
 
-static struct attribute *sht21_attributes[] = {
+static struct attribute *sht21_attrs[] = {
         &sensor_dev_attr_temp1_input.dev_attr.attr,
         &sensor_dev_attr_humidity1_input.dev_attr.attr,
         NULL
 };
 
-static const struct attribute_group sht21_attr_group = {
-        .attrs = sht21_attributes,
-};
+ATTRIBUTE_GROUPS(sht21);
 
-/**
- * sht21_probe() - probe device
- * @client: I2C client device
- * @id: device ID
- *
- * Called by the I2C core when an entry in the ID table matches a
- * device's name.
- * Returns 0 on success.
- */
 static int sht21_probe(struct i2c_client *client,
         const struct i2c_device_id *id)
 {
+        struct device *dev = &client->dev;
+        struct device *hwmon_dev;
         struct sht21 *sht21;
-        int err;
 
         if (!i2c_check_functionality(client->adapter,
                                      I2C_FUNC_SMBUS_WORD_DATA)) {
@@ -200,47 +193,17 @@ static int sht21_probe(struct i2c_client *client,
                 return -ENODEV;
         }
 
-        sht21 = devm_kzalloc(&client->dev, sizeof(*sht21), GFP_KERNEL);
+        sht21 = devm_kzalloc(dev, sizeof(*sht21), GFP_KERNEL);
         if (!sht21)
                 return -ENOMEM;
 
-        i2c_set_clientdata(client, sht21);
+        sht21->client = client;
 
         mutex_init(&sht21->lock);
 
-        err = sysfs_create_group(&client->dev.kobj, &sht21_attr_group);
-        if (err) {
-                dev_dbg(&client->dev, "could not create sysfs files\n");
-                return err;
-        }
-        sht21->hwmon_dev = hwmon_device_register(&client->dev);
-        if (IS_ERR(sht21->hwmon_dev)) {
-                dev_dbg(&client->dev, "unable to register hwmon device\n");
-                err = PTR_ERR(sht21->hwmon_dev);
-                goto fail_remove_sysfs;
-        }
-
-        dev_info(&client->dev, "initialized\n");
-
-        return 0;
-
-fail_remove_sysfs:
-        sysfs_remove_group(&client->dev.kobj, &sht21_attr_group);
-        return err;
-}
-
-/**
- * sht21_remove() - remove device
- * @client: I2C client device
- */
-static int sht21_remove(struct i2c_client *client)
-{
-        struct sht21 *sht21 = i2c_get_clientdata(client);
-
-        hwmon_device_unregister(sht21->hwmon_dev);
-        sysfs_remove_group(&client->dev.kobj, &sht21_attr_group);
-
-        return 0;
+        hwmon_dev = devm_hwmon_device_register_with_groups(dev, client->name,
+                                                           sht21, sht21_groups);
+        return PTR_ERR_OR_ZERO(hwmon_dev);
 }
 
 /* Device ID table */
@@ -253,7 +216,6 @@ MODULE_DEVICE_TABLE(i2c, sht21_id);
 static struct i2c_driver sht21_driver = {
         .driver.name = "sht21",
         .probe       = sht21_probe,
-        .remove      = sht21_remove,
         .id_table    = sht21_id,
 };