1 files changed, 90 insertions, 0 deletions
diff --git a/drivers/thermal/thermal_trip.c b/drivers/thermal/thermal_trip.c
new file mode 100644
index 000000000000..4b8238468b53
--- /dev/null
+++ b/drivers/thermal/thermal_trip.c
@@ -0,0 +1,90 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ *  Copyright (C) 2008 Intel Corp
+ *  Copyright (C) 2008 Zhang Rui <rui.zhang@intel.com>
+ *  Copyright (C) 2008 Sujith Thomas <sujith.thomas@intel.com>
+ *  Copyright 2022 Linaro Limited
+ *
+ * Thermal trips handling
+ */
+#include "thermal_core.h"
+
+static const char *trip_type_names[] = {
+	[THERMAL_TRIP_ACTIVE] = "active",
+	[THERMAL_TRIP_PASSIVE] = "passive",
+	[THERMAL_TRIP_HOT] = "hot",
+	[THERMAL_TRIP_CRITICAL] = "critical",
+};
+
+const char *thermal_trip_type_name(enum thermal_trip_type trip_type)
+{
+	if (trip_type < THERMAL_TRIP_ACTIVE || trip_type > THERMAL_TRIP_CRITICAL)
+		return "unknown";
+
+	return trip_type_names[trip_type];
+}
+
+int for_each_thermal_trip(struct thermal_zone_device *tz,
+			  int (*cb)(struct thermal_trip *, void *),
+			  void *data)
+{
+	struct thermal_trip_desc *td;
+	int ret;
+
+	for_each_trip_desc(tz, td) {
+		ret = cb(&td->trip, data);
+		if (ret)
+			return ret;
+	}
+
+	return 0;
+}
+EXPORT_SYMBOL_GPL(for_each_thermal_trip);
+
+int thermal_zone_for_each_trip(struct thermal_zone_device *tz,
+			       int (*cb)(struct thermal_trip *, void *),
+			       void *data)
+{
+	guard(thermal_zone)(tz);
+
+	return for_each_thermal_trip(tz, cb, data);
+}
+EXPORT_SYMBOL_GPL(thermal_zone_for_each_trip);
+
+void thermal_zone_set_trips(struct thermal_zone_device *tz, int low, int high)
+{
+	int ret;
+
+	lockdep_assert_held(&tz->lock);
+
+	if (!tz->ops.set_trips)
+		return;
+
+	/* No need to change trip points */
+	if (tz->prev_low_trip == low && tz->prev_high_trip == high)
+		return;
+
+	tz->prev_low_trip = low;
+	tz->prev_high_trip = high;
+
+	dev_dbg(&tz->device,
+		"new temperature boundaries: %d < x < %d\n", low, high);
+
+	/*
+	 * Set a temperature window. When this window is left the driver
+	 * must inform the thermal core via thermal_zone_device_update.
+	 */
+	ret = tz->ops.set_trips(tz, low, high);
+	if (ret)
+		dev_err(&tz->device, "Failed to set trips: %d\n", ret);
+}
+
+int thermal_zone_trip_id(const struct thermal_zone_device *tz,
+			 const struct thermal_trip *trip)
+{
+	/*
+	 * Assume the trip to be located within the bounds of the thermal
+	 * zone's trips[] table.
+	 */
+	return trip_to_trip_desc(trip) - tz->trips;
+}