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mtd: expose ecc_strength through sysfs 

ecc_strength element of struct mtd_info is exposed as a read-only variable in
sysfs.

Signed-off-by: Mike Dunn <mikedunn@newsguy.com>
Signed-off-by: Artem Bityutskiy <artem.bityutskiy@linux.intel.com>
Signed-off-by: David Woodhouse <David.Woodhouse@intel.com>
hifive-unleashed-5.1
Mike Dunn 2012-04-25 12:06:07 -07:00 committed by David Woodhouse
parent 44df4d11b8
commit a9b672e82b
2 changed files with 22 additions and 0 deletions
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12
Documentation/ABI/testing/sysfs-class-mtd
View File

@ -123,3 +123,15 @@ Description:
half page, or a quarter page).
In the case of ECC NOR, it is the ECC block size.
What: /sys/class/mtd/mtdX/ecc_strength
Date: April 2012
KernelVersion: 3.4
Contact: linux-mtd@lists.infradead.org
Description:
Maximum number of bit errors that the device is capable of
correcting within each region covering an ecc step. This will
always be a non-negative integer. Note that some devices will
have multiple ecc steps within each writesize region.
In the case of devices lacking any ECC capability, it is 0.

10
drivers/mtd/mtdcore.c
View File

@ -250,6 +250,15 @@ static ssize_t mtd_name_show(struct device *dev,
}
static DEVICE_ATTR(name, S_IRUGO, mtd_name_show, NULL);
static ssize_t mtd_ecc_strength_show(struct device *dev,
struct device_attribute *attr, char *buf)
{
struct mtd_info *mtd = dev_get_drvdata(dev);
return snprintf(buf, PAGE_SIZE, "%u\n", mtd->ecc_strength);
}
static DEVICE_ATTR(ecc_strength, S_IRUGO, mtd_ecc_strength_show, NULL);
static struct attribute *mtd_attrs[] = {
&dev_attr_type.attr,
&dev_attr_flags.attr,
@ -260,6 +269,7 @@ static struct attribute *mtd_attrs[] = {
&dev_attr_oobsize.attr,
&dev_attr_numeraseregions.attr,
&dev_attr_name.attr,
&dev_attr_ecc_strength.attr,
NULL,
};