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watchdog: report fw_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.

The file is called "fw_version" instead of "firmware_version" as
"firmware_version" is already used as custom attribute by single drivers.

Signed-off-by: Thomas Weißschuh <linux@weissschuh.net>
Reviewed-by: Guenter Roeck <linux@roeck-us.net>
Link: https://lore.kernel.org/r/20221216-watchdog-sysfs-v2-1-6189311103a9@weissschuh.net
Signed-off-by: Guenter Roeck <linux@roeck-us.net>
Signed-off-by: Wim Van Sebroeck <wim@linux-watchdog.org>
This commit is contained in:
Thomas Weißschuh 2022-12-19 21:30:39 +00:00 committed by Wim Van Sebroeck
parent 12878a9fff
commit b852e7a4a9
2 changed files with 17 additions and 0 deletions
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7
Documentation/ABI/testing/sysfs-class-watchdog
View File

@ -6,6 +6,13 @@ Description:
device at boot. It is equivalent to WDIOC_GETBOOTSTATUS of
ioctl interface.
What: /sys/class/watchdog/watchdogn/fw_version
Date: April 2023
Contact: Thomas Weißschuh
Description:
It is a read only file. It contains firmware version of
watchdog device.
What: /sys/class/watchdog/watchdogn/identity
Date: August 2015
Contact: Wim Van Sebroeck <wim@iguana.be>

10
drivers/watchdog/watchdog_dev.c
View File

@ -547,6 +547,15 @@ static ssize_t pretimeout_show(struct device *dev,
}
static DEVICE_ATTR_RO(pretimeout);
static ssize_t fw_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(fw_version);
static ssize_t identity_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_fw_version.attr,
&dev_attr_identity.attr,
&dev_attr_timeout.attr,
&dev_attr_min_timeout.attr,