mtd: Add sysfs attributes to expose the ECC stats fields

These new sysfs device attributes allow us to retrieve the ECC and bad
block stats by poking a sysfs file, which is often more convenient than
using the ioctl.

Signed-off-by: Ezequiel Garcia <ezequiel.garcia@free-electrons.com>
Tested-by: Pekon Gupta <pekon@ti.com>
Signed-off-by: Brian Norris <computersforpeace@gmail.com>

1 files changed, 38 insertions, 0 deletions

diff --git a/Documentation/ABI/testing/sysfs-class-mtd b/Documentation/ABI/testing/sysfs-class-mtd
index 1399bb2da3eb..76ee192f80a0 100644
--- a/Documentation/ABI/testing/sysfs-class-mtd
+++ b/Documentation/ABI/testing/sysfs-class-mtd
@@ -184,3 +184,41 @@ Description:
 
                 It will always be a non-negative integer.  In the case of
                 devices lacking any ECC capability, it is 0.
+
+What:           /sys/class/mtd/mtdX/ecc_failures
+Date:           June 2014
+KernelVersion:  3.17
+Contact:        linux-mtd@lists.infradead.org
+Description:
+                The number of failures reported by this device's ECC. Typically,
+                these failures are associated with failed read operations.
+
+                It will always be a non-negative integer.  In the case of
+                devices lacking any ECC capability, it is 0.
+
+What:           /sys/class/mtd/mtdX/corrected_bits
+Date:           June 2014
+KernelVersion:  3.17
+Contact:        linux-mtd@lists.infradead.org
+Description:
+                The number of bits that have been corrected by means of the
+                device's ECC.
+
+                It will always be a non-negative integer.  In the case of
+                devices lacking any ECC capability, it is 0.
+
+What:           /sys/class/mtd/mtdX/bad_blocks
+Date:           June 2014
+KernelVersion:  3.17
+Contact:        linux-mtd@lists.infradead.org
+Description:
+                The number of blocks marked as bad, if any, in this partition.
+
+What:           /sys/class/mtd/mtdX/bbt_blocks
+Date:           June 2014
+KernelVersion:  3.17
+Contact:        linux-mtd@lists.infradead.org
+Description:
+                The number of blocks that are marked as reserved, if any, in
+                this partition. These are typically used to store the in-flash
+                bad block table (BBT).