platform/chrome: cros_ec_sysfs: use permission-specific DEVICE_ATTR variants

Use DEVICE_ATTR variants for read/write attributes. This simplifies the
source code, improves readbility, and reduces the chance of
inconsistencies.
Suggested-by: Andy Shevchenko <andy.shevchenko@gmail.com>
Signed-off-by: Enric Balletbo i Serra <enric.balletbo@collabora.com>
Reviewed-by: Andy Shevchenko <andy.shevchenko@gmail.com>
Signed-off-by: Benson Leung <bleung@chromium.org>

drivers/platform/chrome/cros_ec_sysfs.c

@@ -38,7 +38,7 @@
 
 /* Accessor functions */
 
-static ssize_t show_ec_reboot(struct device *dev,
+static ssize_t reboot_show(struct device *dev,
 			   struct device_attribute *attr, char *buf)
 {
 	int count = 0;
@@ -50,7 +50,7 @@ static ssize_t show_ec_reboot(struct device *dev,
 	return count;
 }
 
-static ssize_t store_ec_reboot(struct device *dev,
+static ssize_t reboot_store(struct device *dev,
 			    struct device_attribute *attr,
 			    const char *buf, size_t count)
 {
@@ -123,7 +123,7 @@ static ssize_t store_ec_reboot(struct device *dev,
 	return count;
 }
 
-static ssize_t show_ec_version(struct device *dev,
+static ssize_t version_show(struct device *dev,
 			    struct device_attribute *attr, char *buf)
 {
 	static const char * const image_names[] = {"unknown", "RO", "RW"};
@@ -225,7 +225,7 @@ static ssize_t show_ec_version(struct device *dev,
 	return count;
 }
 
-static ssize_t show_ec_flashinfo(struct device *dev,
+static ssize_t flashinfo_show(struct device *dev,
 			      struct device_attribute *attr, char *buf)
 {
 	struct ec_response_flash_info *resp;
@@ -260,9 +260,9 @@ static ssize_t show_ec_flashinfo(struct device *dev,
 
 /* Module initialization */
 
-static DEVICE_ATTR(reboot, S_IWUSR | S_IRUGO, show_ec_reboot, store_ec_reboot);
-static DEVICE_ATTR(version, S_IRUGO, show_ec_version, NULL);
-static DEVICE_ATTR(flashinfo, S_IRUGO, show_ec_flashinfo, NULL);
+static DEVICE_ATTR_RW(reboot);
+static DEVICE_ATTR_RO(version);
+static DEVICE_ATTR_RO(flashinfo);
 
 static struct attribute *__ec_attrs[] = {
 	&dev_attr_reboot.attr,