In some circumstances, multiple __ATTR_RO attributes need to be assigned
with a single show function.
Add this macro to make life easier with simple code.
Signed-off-by: Orson Zhai <orsonzhai@xxxxxxxxx>
---
Documentation/filesystems/sysfs.rst | 2 ++
include/linux/sysfs.h | 5 +++++
2 files changed, 7 insertions(+)
diff --git a/Documentation/filesystems/sysfs.rst b/Documentation/filesystems/sysfs.rst
index 004d490..0e2274a 100644
--- a/Documentation/filesystems/sysfs.rst
+++ b/Documentation/filesystems/sysfs.rst
@@ -141,6 +141,8 @@ __ATTR_RO_MODE(name, mode):
fore more restrictive RO access currently
only use case is the EFI System Resource Table
(see drivers/firmware/efi/esrt.c)
+__ATTR_RO_SHOW(name, show):
+ assumes default mode 0444 with specified show.
__ATTR_RW(name):
assumes default name_show, name_store and setting
mode to 0644.
diff --git a/include/linux/sysfs.h b/include/linux/sysfs.h
index 2caa34c..c851592 100644
--- a/include/linux/sysfs.h
+++ b/include/linux/sysfs.h
@@ -117,6 +117,11 @@ struct attribute_group {
.show = _name##_show, \
}
+#define __ATTR_RO_SHOW(_name, _show) { \
+ .attr = { .name = __stringify(_name), .mode = 0444 }, \
+ .show = _show, \
+}
+
#define __ATTR_RO_MODE(_name, _mode) { \
.attr = { .name = __stringify(_name), \
.mode = VERIFY_OCTAL_PERMISSIONS(_mode) }, \
--
2.7.4
