linux-kernel - [PATCH] watchdog: Report firmware

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Date:   Fri, 25 Nov 2022 23:23:15 +0100
From:   Thomas Weißschuh <linux@...ssschuh.net>
To:     Wim Van Sebroeck <wim@...ux-watchdog.org>,
        Guenter Roeck <linux@...ck-us.net>
Cc:     Thomas Weißschuh <linux@...ssschuh.net>,
        linux-watchdog@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [PATCH] watchdog: Report firmware_version 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>

---

Userspace implementation:

https://github.com/util-linux/util-linux/pull/1927
---
 drivers/watchdog/watchdog_dev.c | 10 ++++++++++
 1 file changed, 10 insertions(+)

diff --git a/drivers/watchdog/watchdog_dev.c b/drivers/watchdog/watchdog_dev.c
index 55574ed42504..88c76e27873c 100644
--- a/drivers/watchdog/watchdog_dev.c
+++ b/drivers/watchdog/watchdog_dev.c
@@ -555,6 +555,15 @@ static ssize_t identity_show(struct device *dev, struct device_attribute *attr,
 }
 static DEVICE_ATTR_RO(identity);
 
+static ssize_t firmware_version_show(struct device *dev, struct device_attribute *attr,
+				     char *buf)
+{
+	struct watchdog_device *wdd = dev_get_drvdata(dev);
+
+	return sysfs_emit(buf, "%d\n", wdd->info->firmware_version);
+}
+static DEVICE_ATTR_RO(firmware_version);
+
 static ssize_t state_show(struct device *dev, struct device_attribute *attr,
 				char *buf)
 {
@@ -618,6 +627,7 @@ static umode_t wdt_is_visible(struct kobject *kobj, struct attribute *attr,
 static struct attribute *wdt_attrs[] = {
 	&dev_attr_state.attr,
 	&dev_attr_identity.attr,
+	&dev_attr_firmware_version.attr,
 	&dev_attr_timeout.attr,
 	&dev_attr_min_timeout.attr,
 	&dev_attr_max_timeout.attr,

base-commit: 0b1dcc2cf55ae6523c6fbd0d741b3ac28c9f4536
-- 
2.38.1