From mboxrd@z Thu Jan 1 00:00:00 1970 From: Xiaolei Li Subject: [PATCH] mtd: Add sysfs attribute for mtd OOB available size Date: Mon, 2 Apr 2018 16:20:10 +0800 Message-ID: <1522657210-56833-2-git-send-email-xiaolei.li@mediatek.com> References: <1522657210-56833-1-git-send-email-xiaolei.li@mediatek.com> Mime-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Return-path: In-Reply-To: <1522657210-56833-1-git-send-email-xiaolei.li-NuS5LvNUpcJWk0Htik3J/w@public.gmane.org> List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: "Linux-mediatek" Errors-To: linux-mediatek-bounces+glpam-linux-mediatek=m.gmane.org-IAPFreCvJWM7uuMidbF8XUB+6BGkLq7r@public.gmane.org To: boris.brezillon-LDxbnhwyfcJBDgjK7y7TUQ@public.gmane.org, richard-/L3Ra7n9ekc@public.gmane.org Cc: linux-mediatek-IAPFreCvJWM7uuMidbF8XUB+6BGkLq7r@public.gmane.org, xiaolei.li-NuS5LvNUpcJWk0Htik3J/w@public.gmane.org, linux-mtd-IAPFreCvJWM7uuMidbF8XUB+6BGkLq7r@public.gmane.org, srv_heupstream-NuS5LvNUpcJWk0Htik3J/w@public.gmane.org List-Id: linux-mediatek@lists.infradead.org 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 --- Documentation/ABI/testing/sysfs-class-mtd | 8 ++++++++ drivers/mtd/mtdcore.c | 10 ++++++++++ 2 files changed, 18 insertions(+) diff --git a/Documentation/ABI/testing/sysfs-class-mtd b/Documentation/ABI/testing/sysfs-class-mtd index f34e5923..3bc7c0a 100644 --- a/Documentation/ABI/testing/sysfs-class-mtd +++ b/Documentation/ABI/testing/sysfs-class-mtd @@ -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-IAPFreCvJWM7uuMidbF8XUB+6BGkLq7r@public.gmane.org +Description: + Number of bytes available for a client to place data into + the out of band area. diff --git a/drivers/mtd/mtdcore.c b/drivers/mtd/mtdcore.c index 807d17d..99d9352 100644 --- a/drivers/mtd/mtdcore.c +++ b/drivers/mtd/mtdcore.c @@ -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, "%lu\n", (unsigned long)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 ssize_t mtd_bbtblocks_show(struct device *dev, &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, -- 1.9.1