mtd: expose subpage size via sysfs

[safe/jmp/linux-2.6] / drivers / mtd / mtdcore.c

diff --git a/drivers/mtd/mtdcore.c b/drivers/mtd/mtdcore.c
index 051b4d4..bccb4b1 100644 (file)
--- a/drivers/mtd/mtdcore.c
+++ b/drivers/mtd/mtdcore.c
@@ -132,6 +132,17 @@ static ssize_t mtd_writesize_show(struct device *dev,
 }
 static DEVICE_ATTR(writesize, S_IRUGO, mtd_writesize_show, NULL);
 
+static ssize_t mtd_subpagesize_show(struct device *dev,
+               struct device_attribute *attr, char *buf)
+{
+       struct mtd_info *mtd = dev_to_mtd(dev);
+       unsigned int subpagesize = mtd->writesize >> mtd->subpage_sft;
+
+       return snprintf(buf, PAGE_SIZE, "%u\n", subpagesize);
+
+}
+static DEVICE_ATTR(subpagesize, S_IRUGO, mtd_subpagesize_show, NULL);
+
 static ssize_t mtd_oobsize_show(struct device *dev,
                struct device_attribute *attr, char *buf)
 {
@@ -169,6 +180,7 @@ static struct attribute *mtd_attrs[] = {
        &dev_attr_size.attr,
        &dev_attr_erasesize.attr,
        &dev_attr_writesize.attr,
+       &dev_attr_subpagesize.attr,
        &dev_attr_oobsize.attr,
        &dev_attr_numeraseregions.attr,
        &dev_attr_name.attr,