linux-kernel - [PATCH v3 04/30] thermal/core: Add a generic thermal_zone_get_crit

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Date:   Tue,  6 Sep 2022 18:46:54 +0200
From:   Daniel Lezcano <daniel.lezcano@...aro.org>
To:     daniel.lezcano@...aro.org, rafael@...nel.org
Cc:     linux-kernel@...r.kernel.org, linux-pm@...r.kernel.org,
        Amit Kucheria <amitk@...nel.org>,
        Zhang Rui <rui.zhang@...el.com>
Subject: [PATCH v3 04/30] thermal/core: Add a generic thermal_zone_get_crit_temp() function

The thermal zone ops defines a callback to retrieve the critical
temperature. As the trip handling is being reworked, all the trip
points will be the same whatever the driver and consequently finding
the critical trip temperature will be just a loop to search for a
critical trip point type.

Provide such a generic function, so we encapsulate the ops
get_crit_temp() which can be removed when all the backend drivers are
using the generic trip points handling.

Signed-off-by: Daniel Lezcano <daniel.lezcano@...aro.org>
---
 drivers/thermal/thermal_core.c | 27 +++++++++++++++++++++++++++
 include/linux/thermal.h        |  2 ++
 2 files changed, 29 insertions(+)

diff --git a/drivers/thermal/thermal_core.c b/drivers/thermal/thermal_core.c
index fa0f89a24b68..2495c174a226 100644
--- a/drivers/thermal/thermal_core.c
+++ b/drivers/thermal/thermal_core.c
@@ -1144,6 +1144,33 @@ int thermal_zone_get_num_trips(struct thermal_zone_device *tz)
 }
 EXPORT_SYMBOL_GPL(thermal_zone_get_num_trips);
 
+int thermal_zone_get_crit_temp(struct thermal_zone_device *tz, int *temp)
+{
+	int i, ret = 0;
+
+	if (tz->ops->get_crit_temp)
+		return tz->ops->get_crit_temp(tz, temp);
+	
+	if (!tz->trips)
+		return -EINVAL;
+
+	mutex_lock(&tz->lock);
+
+	for (i = 0; i < tz->num_trips; i++) {
+		if (tz->trips[i].type == THERMAL_TRIP_CRITICAL) {
+			*temp = tz->trips[i].temperature;
+			goto out;
+		}
+	}
+
+	ret = -EINVAL;
+out:
+	mutex_unlock(&tz->lock);
+
+	return ret;
+}
+EXPORT_SYMBOL_GPL(thermal_zone_get_crit_temp);
+
 static int __thermal_zone_get_trip(struct thermal_zone_device *tz, int trip_id,
 				   struct thermal_trip *trip)
 {
diff --git a/include/linux/thermal.h b/include/linux/thermal.h
index 5350a437f245..66373f872237 100644
--- a/include/linux/thermal.h
+++ b/include/linux/thermal.h
@@ -343,6 +343,8 @@ int thermal_zone_set_trip(struct thermal_zone_device *tz, int trip_id,
 
 int thermal_zone_get_num_trips(struct thermal_zone_device *tz);
 
+int thermal_zone_get_crit_temp(struct thermal_zone_device *tz, int *temp);
+
 #ifdef CONFIG_THERMAL
 struct thermal_zone_device *thermal_zone_device_register(const char *, int, int,
 		void *, struct thermal_zone_device_ops *,
-- 
2.34.1