We already own DEFINE_SHOW_ATTRIBUTE() helper macro for defining attribute
for read-only file, but many of drivers want a helper macro for read-write
file too.
So we add DEFINE_SHOW_STORE_ATTRIBUTE helper to reduce duplicated code.
Signed-off-by: Luo Jiaxing <luojiaxing@xxxxxxxxxx>
Signed-off-by: Xingui Yang <yangxingui@xxxxxxxxxx>
---
include/linux/seq_file.h | 15 +++++++++++++++
1 file changed, 15 insertions(+)
diff --git a/include/linux/seq_file.h b/include/linux/seq_file.h
index bd023dd38ae6..e400007e410c 100644
--- a/include/linux/seq_file.h
+++ b/include/linux/seq_file.h
@@ -207,6 +207,21 @@ static const struct file_operations __name ## _fops = { \
.release = single_release, \
}
+#define DEFINE_SHOW_STORE_ATTRIBUTE(__name) \
+static int __name ## _open(struct inode *inode, struct file *file) \
+{ \
+ return single_open(file, __name ## _show, inode->i_private); \
+} \
+ \
+static const struct file_operations __name ## _fops = { \
+ .owner = THIS_MODULE, \
+ .open = __name ## _open, \
+ .read = seq_read, \
+ .write = __name ## _write, \
+ .llseek = seq_lseek, \
+ .release = single_release, \
+}
+
#define DEFINE_PROC_SHOW_ATTRIBUTE(__name) \
static int __name ## _open(struct inode *inode, struct file *file) \
{ \
--
2.17.1
