regulator: userspace-consumer: use DEVICE_ATTR_RO/RW macro

Use DEVICE_ATTR_RO/RW macro helper instead of plain DEVICE_ATTR, which
makes the code a bit shorter and easier to read.
Signed-off-by: Zhen Lei <thunder.leizhen@huawei.com>
Link: https://lore.kernel.org/r/20210602080526.11117-1-thunder.leizhen@huawei.comSigned-off-by: Mark Brown <broonie@kernel.org>

drivers/regulator/userspace-consumer.c

@@ -29,7 +29,7 @@ struct userspace_consumer_data {
 	struct regulator_bulk_data *supplies;
 };
 
-static ssize_t reg_show_name(struct device *dev,
+static ssize_t name_show(struct device *dev,
 			 struct device_attribute *attr, char *buf)
 {
 	struct userspace_consumer_data *data = dev_get_drvdata(dev);
@@ -37,7 +37,7 @@ static ssize_t reg_show_name(struct device *dev,
 	return sprintf(buf, "%s\n", data->name);
 }
 
-static ssize_t reg_show_state(struct device *dev,
+static ssize_t state_show(struct device *dev,
 			  struct device_attribute *attr, char *buf)
 {
 	struct userspace_consumer_data *data = dev_get_drvdata(dev);
@@ -48,7 +48,7 @@ static ssize_t reg_show_state(struct device *dev,
 	return sprintf(buf, "disabled\n");
 }
 
-static ssize_t reg_set_state(struct device *dev, struct device_attribute *attr,
+static ssize_t state_store(struct device *dev, struct device_attribute *attr,
 			   const char *buf, size_t count)
 {
 	struct userspace_consumer_data *data = dev_get_drvdata(dev);
@@ -87,8 +87,8 @@ static ssize_t reg_set_state(struct device *dev, struct device_attribute *attr,
 	return count;
 }
 
-static DEVICE_ATTR(name, 0444, reg_show_name, NULL);
-static DEVICE_ATTR(state, 0644, reg_show_state, reg_set_state);
+static DEVICE_ATTR_RO(name);
+static DEVICE_ATTR_RW(state);
 
 static struct attribute *attributes[] = {
 	&dev_attr_name.attr,