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Commit 7cc9aa66 authored by Xiaolei Li's avatar Xiaolei Li Committed by Boris Brezillon
Browse files

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: default avatarXiaolei Li <xiaolei.li@mediatek.com>
Signed-off-by: default avatarBoris Brezillon <boris.brezillon@bootlin.com>
parent c3c9a2c4

Documentation/ABI/testing/sysfs-class-mtd

+8 −0
Original line number Diff line number Diff line
@@ -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.

drivers/mtd/mtdcore.c

+10 −0
Original line number Diff line number Diff line
@@ -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,