mtd: add an ioctl to query the lock status of a flash sector

This patchs adds a way for user space programs to find out whether a
flash sector is locked. An optional driver method in the mtd_info struct
provides the information.

Signed-off-by: Richard Cochran <richard.cochran@omicron.at>
Signed-off-by: Artem Bityutskiy <Artem.Bityutskiy@nokia.com>
Signed-off-by: David Woodhouse <David.Woodhouse@intel.com>

2 files changed, 2 insertions, 0 deletions

diff --git a/include/linux/mtd/mtd.h b/include/linux/mtd/mtd.h
index 5326435a7571..43b7d72c6116 100644
--- a/include/linux/mtd/mtd.h
+++ b/include/linux/mtd/mtd.h
@@ -216,6 +216,7 @@ struct mtd_info {
         /* Chip-supported device locking */
         int (*lock) (struct mtd_info *mtd, loff_t ofs, uint64_t len);
         int (*unlock) (struct mtd_info *mtd, loff_t ofs, uint64_t len);
+        int (*is_locked) (struct mtd_info *mtd, loff_t ofs, uint64_t len);
 
         /* Power Management functions */
         int (*suspend) (struct mtd_info *mtd);
diff --git a/include/mtd/mtd-abi.h b/include/mtd/mtd-abi.h
index be51ae2bd0ff..e12872e3c694 100644
--- a/include/mtd/mtd-abi.h
+++ b/include/mtd/mtd-abi.h
@@ -110,6 +110,7 @@ struct otp_info {
 #define MEMERASE64              _IOW('M', 20, struct erase_info_user64)
 #define MEMWRITEOOB64           _IOWR('M', 21, struct mtd_oob_buf64)
 #define MEMREADOOB64            _IOWR('M', 22, struct mtd_oob_buf64)
+#define MEMISLOCKED             _IOR('M', 23, struct erase_info_user)
 
 /*
  * Obsolete legacy interface. Keep it in order not to break userspace