From de7345ca24094c5df0ee17c49998e3faf6cd6dda Mon Sep 17 00:00:00 2001
From: Guenter Roeck <linux@roeck-us.net>
Date: Wed, 21 Feb 2018 12:58:03 -0800
Subject: [PATCH] compat: Introduce DEVICE_ATTR_RO

Signed-off-by: Guenter Roeck <linux@roeck-us.net>
---
 compat.h | 12 ++++++++++++
 1 file changed, 12 insertions(+)

diff --git a/compat.h b/compat.h
index 4ea3a99..de03ccb 100644
--- a/compat.h
+++ b/compat.h
@@ -234,4 +234,16 @@ module_exit(__driver##_exit);
 #define sysfs_attr_init(attr) do {} while (0)
 #endif
 
+#ifndef __ATTR_RO
+#define __ATTR_RO(_name) {						\
+	.attr   = { .name = __stringify(_name), .mode = 0444 },		\
+	.show   = _name##_show,						\
+}
+#endif
+
+#ifndef DEVICE_ATTR_RO
+#define DEVICE_ATTR_RO(_name) \
+	struct device_attribute dev_attr_##_name = __ATTR_RO(_name)
+#endif
+
 #endif /* __COMPAT_H */
-- 
2.39.5