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mtd: Add sysfs attribute for mtd OOB available size 

Expose mtd OOB available size by sysfs file. Then users can get available
OOB size by accessing /sys/class/mtd/mtdX/oobavail.

Signed-off-by: Xiaolei Li <xiaolei.li@mediatek.com>
Signed-off-by: Boris Brezillon <boris.brezillon@bootlin.com>
This commit is contained in:
Xiaolei Li 2018-04-02 16:20:10 +08:00 committed by Boris Brezillon
parent c3c9a2c4b9
commit 7cc9aa669a
2 changed files with 18 additions and 0 deletions
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8
Documentation/ABI/testing/sysfs-class-mtd
View File

@ -232,3 +232,11 @@ Description:
of the parent (another partition or a flash device) in bytes.
This attribute is absent on flash devices, so it can be used
to distinguish them from partitions.
What: /sys/class/mtd/mtdX/oobavail
Date: April 2018
KernelVersion: 4.16
Contact: linux-mtd@lists.infradead.org
Description:
Number of bytes available for a client to place data into
the out of band area.

10
drivers/mtd/mtdcore.c
View File

@ -210,6 +210,15 @@ static ssize_t mtd_oobsize_show(struct device *dev,
}
static DEVICE_ATTR(oobsize, S_IRUGO, mtd_oobsize_show, NULL);
static ssize_t mtd_oobavail_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->oobavail);
}
static DEVICE_ATTR(oobavail, S_IRUGO, mtd_oobavail_show, NULL);
static ssize_t mtd_numeraseregions_show(struct device *dev,
struct device_attribute *attr, char *buf)
{
@ -327,6 +336,7 @@ static struct attribute *mtd_attrs[] = {
&dev_attr_writesize.attr,
&dev_attr_subpagesize.attr,
&dev_attr_oobsize.attr,
&dev_attr_oobavail.attr,
&dev_attr_numeraseregions.attr,
&dev_attr_name.attr,
&dev_attr_ecc_strength.attr,