[PATCH 2/3] MTD: add sysfs file which shows if the device is writable

Artem Bityutskiy
2009-04-21T09:31:56Z

Add "writable" per-mtd device file which contains 1 if the
MTD device is writable and 0 if it is not.

Cc: David Brownell <david-b@pacbell.net>
Signed-off-by: Artem Bityutskiy <Artem.Bityutskiy@nokia.com>
---
drivers/mtd/mtdcore.c | 11 +++++++++++
1 files changed, 11 insertions(+), 0 deletions(-)

diff --git a/drivers/mtd/mtdcore.c b/drivers/mtd/mtdcore.c
index c46f1a9..07105a8 100644
--- a/drivers/mtd/mtdcore.c
+++ b/drivers/mtd/mtdcore.c
@@ -184,6 +184,16 @@ static ssize_t mtd_bb_allowed_show(struct device *dev,
}
static DEVICE_ATTR(bb_allowed, S_IRUGO, mtd_bb_allowed_show, NULL);

+static ssize_t mtd_writable_show(struct device *dev,
+ struct device_attribute *attr, char *buf)
+{
+ struct mtd_info *mtd = dev_to_mtd(dev);
+
+ return snprintf(buf, PAGE_SIZE, "%d\n", !!(mtd->flags & MTD_WRITEABLE));
+
+}
+static DEVICE_ATTR(writable, S_IRUGO, mtd_writable_show, NULL);
+
static struct attribute *mtd_attrs[] = {
&dev_attr_type.attr,
&dev_attr_flags.attr,
@@ -195,6 +205,7 @@ static struct attribute *mtd_attrs[] = {
&dev_attr_numeraseregions.attr,
&dev_attr_name.attr,
&dev_attr_bb_allowed.attr,
+ &dev_attr_writable.attr,
NULL,
};