linux-kernel - [PATCH v2 2/2] watchdog: report options in sysfs

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Date:   Mon, 19 Dec 2022 21:30:40 +0000
From:   Thomas Weißschuh <linux@...ssschuh.net>
To:     Wim Van Sebroeck <wim@...ux-watchdog.org>,
        Guenter Roeck <linux@...ck-us.net>
Cc:     linux-kernel@...r.kernel.org, linux-watchdog@...r.kernel.org,
        Thomas Weißschuh <linux@...ssschuh.net>,
        Wim Van Sebroeck <wim@...ana.be>
Subject: [PATCH v2 2/2] watchdog: report options in sysfs

This synchronizes the information reported by ioctl and sysfs.
The mismatch is confusing because "wdctl" from util-linux uses the ioctl
when used with root privileges and sysfs without.

Signed-off-by: Thomas Weißschuh <linux@...ssschuh.net>
---
 Documentation/ABI/testing/sysfs-class-watchdog |  6 ++++++
 drivers/watchdog/watchdog_dev.c                | 10 ++++++++++
 2 files changed, 16 insertions(+)

diff --git a/Documentation/ABI/testing/sysfs-class-watchdog b/Documentation/ABI/testing/sysfs-class-watchdog
index 27c000238fe4..94fb74615951 100644
--- a/Documentation/ABI/testing/sysfs-class-watchdog
+++ b/Documentation/ABI/testing/sysfs-class-watchdog
@@ -6,6 +6,12 @@ Description:
 		device at boot. It is equivalent to WDIOC_GETBOOTSTATUS of
 		ioctl interface.
 
+What:		/sys/class/watchdog/watchdogn/options
+Date:		April 2023
+Contact:	Thomas Weißschuh
+Description:
+		It is a read only file. It contains options of watchdog device.
+
 What:		/sys/class/watchdog/watchdogn/fw_version
 Date:		April 2023
 Contact:	Thomas Weißschuh
diff --git a/drivers/watchdog/watchdog_dev.c b/drivers/watchdog/watchdog_dev.c
index 7feeda02a531..2b06c179f754 100644
--- a/drivers/watchdog/watchdog_dev.c
+++ b/drivers/watchdog/watchdog_dev.c
@@ -546,6 +546,15 @@ static ssize_t pretimeout_show(struct device *dev,
 }
 static DEVICE_ATTR_RO(pretimeout);
 
+static ssize_t options_show(struct device *dev, struct device_attribute *attr,
+			       char *buf)
+{
+	struct watchdog_device *wdd = dev_get_drvdata(dev);
+
+	return sysfs_emit(buf, "0x%x\n", wdd->info->options);
+}
+static DEVICE_ATTR_RO(options);
+
 static ssize_t fw_version_show(struct device *dev, struct device_attribute *attr,
 			       char *buf)
 {
@@ -626,6 +635,7 @@ static umode_t wdt_is_visible(struct kobject *kobj, struct attribute *attr,
 }
 static struct attribute *wdt_attrs[] = {
 	&dev_attr_state.attr,
+	&dev_attr_options.attr,
 	&dev_attr_fw_version.attr,
 	&dev_attr_identity.attr,
 	&dev_attr_timeout.attr,

-- 
2.39.0