thermal: netlink: Add genetlink bind/unbind notifications

Introduce a new feature to the thermal netlink framework, enabling the
registration of sub drivers to receive events via a notifier mechanism.
Specifically, implement genetlink family bind and unbind callbacks to send
BIND and UNBIND events.

The primary purpose of this enhancement is to facilitate the tracking of
user-space consumers by the Intel HFI driver. By leveraging these
notifications, the driver can determine when consumers are present
or absent.

Suggested-by: Jakub Kicinski <kuba@kernel.org>
Signed-off-by: Stanislaw Gruszka <stanislaw.gruszka@linux.intel.com>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>

1 files changed, 26 insertions, 0 deletions

diff --git a/drivers/thermal/thermal_netlink.h b/drivers/thermal/thermal_netlink.h
index 93a927e144d5..e01221e8816b 100644
--- a/drivers/thermal/thermal_netlink.h
+++ b/drivers/thermal/thermal_netlink.h
@@ -10,6 +10,19 @@ struct thermal_genl_cpu_caps {
 	int efficiency;
 };
 
+enum thermal_genl_multicast_groups {
+	THERMAL_GENL_SAMPLING_GROUP = 0,
+	THERMAL_GENL_EVENT_GROUP = 1,
+	THERMAL_GENL_MAX_GROUP = THERMAL_GENL_EVENT_GROUP,
+};
+
+#define THERMAL_NOTIFY_BIND	0
+#define THERMAL_NOTIFY_UNBIND	1
+
+struct thermal_genl_notify {
+	int mcgrp;
+};
+
 struct thermal_zone_device;
 struct thermal_trip;
 struct thermal_cooling_device;
@@ -18,6 +31,9 @@ struct thermal_cooling_device;
 #ifdef CONFIG_THERMAL_NETLINK
 int __init thermal_netlink_init(void);
 void __init thermal_netlink_exit(void);
+int thermal_genl_register_notifier(struct notifier_block *nb);
+int thermal_genl_unregister_notifier(struct notifier_block *nb);
+
 int thermal_notify_tz_create(const struct thermal_zone_device *tz);
 int thermal_notify_tz_delete(const struct thermal_zone_device *tz);
 int thermal_notify_tz_enable(const struct thermal_zone_device *tz);
@@ -48,6 +64,16 @@ static inline int thermal_notify_tz_create(const struct thermal_zone_device *tz)
 	return 0;
 }
 
+static inline int thermal_genl_register_notifier(struct notifier_block *nb)
+{
+	return 0;
+}
+
+static inline int thermal_genl_unregister_notifier(struct notifier_block *nb)
+{
+	return 0;
+}
+
 static inline int thermal_notify_tz_delete(const struct thermal_zone_device *tz)
 {
 	return 0;