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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. of the parent (another partition or a flash device) in bytes.
This attribute is absent on flash devices, so it can be used This attribute is absent on flash devices, so it can be used
to distinguish them from partitions. 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 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, static ssize_t mtd_numeraseregions_show(struct device *dev,
struct device_attribute *attr, char *buf) struct device_attribute *attr, char *buf)
{ {
@ -327,6 +336,7 @@ static struct attribute *mtd_attrs[] = {
&dev_attr_writesize.attr, &dev_attr_writesize.attr,
&dev_attr_subpagesize.attr, &dev_attr_subpagesize.attr,
&dev_attr_oobsize.attr, &dev_attr_oobsize.attr,
&dev_attr_oobavail.attr,
&dev_attr_numeraseregions.attr, &dev_attr_numeraseregions.attr,
&dev_attr_name.attr, &dev_attr_name.attr,
&dev_attr_ecc_strength.attr, &dev_attr_ecc_strength.attr,