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, 45 insertions, 0 deletions

diff --git a/drivers/mtd/mtdcore.c b/drivers/mtd/mtdcore.c
index d201feeb3ca6..11857faa0d96 100644
--- a/drivers/mtd/mtdcore.c
+++ b/drivers/mtd/mtdcore.c
@@ -298,6 +298,47 @@ static ssize_t mtd_ecc_step_size_show(struct device *dev,
 }
 static DEVICE_ATTR(ecc_step_size, S_IRUGO, mtd_ecc_step_size_show, NULL);
 
+static ssize_t mtd_ecc_stats_corrected_show(struct device *dev,
+                struct device_attribute *attr, char *buf)
+{
+        struct mtd_info *mtd = dev_get_drvdata(dev);
+        struct mtd_ecc_stats *ecc_stats = &mtd->ecc_stats;
+
+        return snprintf(buf, PAGE_SIZE, "%u\n", ecc_stats->corrected);
+}
+static DEVICE_ATTR(corrected_bits, S_IRUGO,
+                   mtd_ecc_stats_corrected_show, NULL);
+
+static ssize_t mtd_ecc_stats_errors_show(struct device *dev,
+                struct device_attribute *attr, char *buf)
+{
+        struct mtd_info *mtd = dev_get_drvdata(dev);
+        struct mtd_ecc_stats *ecc_stats = &mtd->ecc_stats;
+
+        return snprintf(buf, PAGE_SIZE, "%u\n", ecc_stats->failed);
+}
+static DEVICE_ATTR(ecc_failures, S_IRUGO, mtd_ecc_stats_errors_show, NULL);
+
+static ssize_t mtd_badblocks_show(struct device *dev,
+                struct device_attribute *attr, char *buf)
+{
+        struct mtd_info *mtd = dev_get_drvdata(dev);
+        struct mtd_ecc_stats *ecc_stats = &mtd->ecc_stats;
+
+        return snprintf(buf, PAGE_SIZE, "%u\n", ecc_stats->badblocks);
+}
+static DEVICE_ATTR(bad_blocks, S_IRUGO, mtd_badblocks_show, NULL);
+
+static ssize_t mtd_bbtblocks_show(struct device *dev,
+                struct device_attribute *attr, char *buf)
+{
+        struct mtd_info *mtd = dev_get_drvdata(dev);
+        struct mtd_ecc_stats *ecc_stats = &mtd->ecc_stats;
+
+        return snprintf(buf, PAGE_SIZE, "%u\n", ecc_stats->bbtblocks);
+}
+static DEVICE_ATTR(bbt_blocks, S_IRUGO, mtd_bbtblocks_show, NULL);
+
 static struct attribute *mtd_attrs[] = {
         &dev_attr_type.attr,
         &dev_attr_flags.attr,
@@ -310,6 +351,10 @@ static struct attribute *mtd_attrs[] = {
         &dev_attr_name.attr,
         &dev_attr_ecc_strength.attr,
         &dev_attr_ecc_step_size.attr,
+        &dev_attr_corrected_bits.attr,
+        &dev_attr_ecc_failures.attr,
+        &dev_attr_bad_blocks.attr,
+        &dev_attr_bbt_blocks.attr,
         &dev_attr_bitflip_threshold.attr,
         NULL,
 };