linux-kernel - [RFC PATCH 3/4] thermal:core:Add genetlink notifications for monitoring falling temperature

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Date:   Fri, 10 Jul 2020 09:51:53 -0400
From:   Thara Gopinath <thara.gopinath@...aro.org>
To:     daniel.lezcano@...aro.org, rui.zhang@...el.com, robh+dt@...nel.org
Cc:     linux-pm@...r.kernel.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: [RFC PATCH 3/4] thermal:core:Add genetlink notifications for monitoring falling temperature

Add notification calls for trip type THERMAL_TRIP_COLD when temperature
crosses the trip point in either direction.

Signed-off-by: Thara Gopinath <thara.gopinath@...aro.org>
---
 drivers/thermal/thermal_core.c | 21 +++++++++++++++------
 1 file changed, 15 insertions(+), 6 deletions(-)

diff --git a/drivers/thermal/thermal_core.c b/drivers/thermal/thermal_core.c
index 750a89f0c20a..e2302ca1cd3b 100644
--- a/drivers/thermal/thermal_core.c
+++ b/drivers/thermal/thermal_core.c
@@ -429,12 +429,21 @@ static void handle_thermal_trip(struct thermal_zone_device *tz, int trip)
 		tz->ops->get_trip_hyst(tz, trip, &hyst);
 
 	if (tz->last_temperature != THERMAL_TEMP_INVALID) {
-		if (tz->last_temperature < trip_temp &&
-		    tz->temperature >= trip_temp)
-			thermal_notify_tz_trip_up(tz->id, trip);
-		if (tz->last_temperature >= trip_temp &&
-		    tz->temperature < (trip_temp - hyst))
-			thermal_notify_tz_trip_down(tz->id, trip);
+		if (type == THERMAL_TRIP_COLD) {
+			if (tz->last_temperature > trip_temp &&
+			    tz->temperature <= trip_temp)
+				thermal_notify_tz_trip_down(tz->id, trip);
+			if (tz->last_temperature <= trip_temp &&
+			    tz->temperature > (trip_temp + hyst))
+				thermal_notify_tz_trip_up(tz->id, trip);
+		} else {
+			if (tz->last_temperature < trip_temp &&
+			    tz->temperature >= trip_temp)
+				thermal_notify_tz_trip_up(tz->id, trip);
+			if (tz->last_temperature >= trip_temp &&
+			    tz->temperature < (trip_temp - hyst))
+				thermal_notify_tz_trip_down(tz->id, trip);
+		}
 	}
 
 	if (type == THERMAL_TRIP_CRITICAL || type == THERMAL_TRIP_HOT)
-- 
2.25.1