hwmon: Report attribute name with udev events

Commit Message

Guenter Roeck Jan. 11, 2022, 11:39 a.m. UTC

Up to now udev events only report the affected hwmon device if an alert
is reported. This requires userspace to read all attributes if it wants
to know what triggered the event. Provide the attribute name with the
NAME property to help userspace find the attribute causing the event.

Signed-off-by: Guenter Roeck <[e-mail]>
---
 drivers/hwmon/hwmon.c | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

Patch

diff --git a/drivers/hwmon/hwmon.c b/drivers/hwmon/hwmon.c
index 3501a3ead4ba..90b4212f83df 100644
--- a/drivers/hwmon/hwmon.c
+++ b/drivers/hwmon/hwmon.c
@@ -623,7 +623,9 @@  static const int __templates_size[] = {
 int hwmon_notify_event(struct device *dev, enum hwmon_sensor_types type,
 		       u32 attr, int channel)
 {
+	char event[MAX_SYSFS_ATTR_NAME_LENGTH + 5];
 	char sattr[MAX_SYSFS_ATTR_NAME_LENGTH];
+	char *envp[] = { event, NULL };
 	const char * const *templates;
 	const char *template;
 	int base;
@@ -639,8 +641,9 @@  int hwmon_notify_event(struct device *dev, enum hwmon_sensor_types type,
 	base = hwmon_attr_base(type);
 
 	scnprintf(sattr, MAX_SYSFS_ATTR_NAME_LENGTH, template, base + channel);
+	scnprintf(event, sizeof(event), "NAME=%s", sattr);
 	sysfs_notify(&dev->kobj, NULL, sattr);
-	kobject_uevent(&dev->kobj, KOBJ_CHANGE);
+	kobject_uevent_env(&dev->kobj, KOBJ_CHANGE, envp);
 
 	if (type == hwmon_temp)
 		hwmon_thermal_notify(dev, channel);