This is used by drivers/media/v4l2-core/v4l2-dev.c.
Signed-off-by: Hauke Mehrtens <hauke@xxxxxxxxxx>
---
backport/backport-include/linux/device.h | 2 ++
backport/backport-include/linux/sysfs.h | 5 +++++
2 files changed, 7 insertions(+)
diff --git a/backport/backport-include/linux/device.h b/backport/backport-include/linux/device.h
index 8f080cc..2244c62 100644
--- a/backport/backport-include/linux/device.h
+++ b/backport/backport-include/linux/device.h
@@ -192,6 +192,8 @@ backport_device_release_driver(struct device *dev)
#if LINUX_VERSION_CODE < KERNEL_VERSION(3,11,0)
#define DEVICE_ATTR_RO(_name) \
struct device_attribute dev_attr_ ## _name = __ATTR_RO(_name);
+#define DEVICE_ATTR_RW(_name) \
+struct device_attribute dev_attr_ ## _name = __ATTR_RW(_name)
#define ATTRIBUTE_GROUPS(_name) \
static struct BP_ATTR_GRP_STRUCT _name##_dev_attrs[ARRAY_SIZE(_name##_attrs)];\
diff --git a/backport/backport-include/linux/sysfs.h b/backport/backport-include/linux/sysfs.h
index a2ef73f..13bab43 100644
--- a/backport/backport-include/linux/sysfs.h
+++ b/backport/backport-include/linux/sysfs.h
@@ -31,4 +31,9 @@ do { \
#endif
#endif
+#ifndef __ATTR_RW
+#define __ATTR_RW(_name) __ATTR(_name, (S_IWUSR | S_IRUGO), \
+ _name##_show, _name##_store)
+#endif
+
#endif /* __BACKPORT_LINUX_SYSFS_H */
--
1.7.10.4
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