thermal/core: Move the thermal trip code to a dedicated file

The thermal_core.c files contains a lot of functions handling
different thermal components like the governors, the trip points, the
cooling device, the OF cooling device, etc ...

This organization does not help to migrate to a more sane code where
there is a better self-encapsulation as all the components' internals
can be directly accessed from a single file.

For the sake of clarity, let's move the thermal trip points code in a
dedicated thermal_trip.c file and add a function to browse all the
trip points like we do with the thermal zones, the govenors and the
cooling devices.

The same can be done for the cooling devices and the governor code but
that will come later as the current work in the thermal framework is
to fix the trip point handling and use a generic trip point structure.

No functional changes intended.
Signed-off-by: Daniel Lezcano <daniel.lezcano@linaro.org>
Reviewed-by: Zhang Rui <rui.zhang@intel.com>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>

drivers/thermal/Makefile

@@ -4,8 +4,8 @@
 #
 
 obj-$(CONFIG_THERMAL)		+= thermal_sys.o
-thermal_sys-y			+= thermal_core.o thermal_sysfs.o \
-					thermal_helpers.o
+thermal_sys-y			+= thermal_core.o thermal_sysfs.o
+thermal_sys-y			+= thermal_trip.o thermal_helpers.o
 
 # netlink interface to manage the thermal framework
 thermal_sys-$(CONFIG_THERMAL_NETLINK)		+= thermal_netlink.o

drivers/thermal/thermal_core.c

@@ -1156,12 +1156,6 @@ static void thermal_set_delay_jiffies(unsigned long *delay_jiffies, int delay_ms
 		*delay_jiffies = round_jiffies(*delay_jiffies);
 }
 
-int thermal_zone_get_num_trips(struct thermal_zone_device *tz)
-{
-	return tz->num_trips;
-}
-EXPORT_SYMBOL_GPL(thermal_zone_get_num_trips);
-
 int thermal_zone_get_crit_temp(struct thermal_zone_device *tz, int *temp)
 {
 	int i, ret = -EINVAL;
@@ -1188,87 +1182,6 @@ int thermal_zone_get_crit_temp(struct thermal_zone_device *tz, int *temp)
 }
 EXPORT_SYMBOL_GPL(thermal_zone_get_crit_temp);
 
-int __thermal_zone_get_trip(struct thermal_zone_device *tz, int trip_id,
-			    struct thermal_trip *trip)
-{
-	int ret;
-
-	if (!tz || trip_id < 0 || trip_id >= tz->num_trips || !trip)
-		return -EINVAL;
-
-	if (tz->trips) {
-		*trip = tz->trips[trip_id];
-		return 0;
-	}
-
-	if (tz->ops->get_trip_hyst) {
-		ret = tz->ops->get_trip_hyst(tz, trip_id, &trip->hysteresis);
-		if (ret)
-			return ret;
-	} else {
-		trip->hysteresis = 0;
-	}
-
-	ret = tz->ops->get_trip_temp(tz, trip_id, &trip->temperature);
-	if (ret)
-		return ret;
-
-	return tz->ops->get_trip_type(tz, trip_id, &trip->type);
-}
-EXPORT_SYMBOL_GPL(__thermal_zone_get_trip);
-
-int thermal_zone_get_trip(struct thermal_zone_device *tz, int trip_id,
-			  struct thermal_trip *trip)
-{
-	int ret;
-
-	mutex_lock(&tz->lock);
-	ret = __thermal_zone_get_trip(tz, trip_id, trip);
-	mutex_unlock(&tz->lock);
-
-	return ret;
-}
-EXPORT_SYMBOL_GPL(thermal_zone_get_trip);
-
-int thermal_zone_set_trip(struct thermal_zone_device *tz, int trip_id,
-			  const struct thermal_trip *trip)
-{
-	struct thermal_trip t;
-	int ret;
-
-	if (!tz->ops->set_trip_temp && !tz->ops->set_trip_hyst && !tz->trips)
-		return -EINVAL;
-
-	ret = __thermal_zone_get_trip(tz, trip_id, &t);
-	if (ret)
-		return ret;
-
-	if (t.type != trip->type)
-		return -EINVAL;
-
-	if (t.temperature != trip->temperature && tz->ops->set_trip_temp) {
-		ret = tz->ops->set_trip_temp(tz, trip_id, trip->temperature);
-		if (ret)
-			return ret;
-	}
-
-	if (t.hysteresis != trip->hysteresis && tz->ops->set_trip_hyst) {
-		ret = tz->ops->set_trip_hyst(tz, trip_id, trip->hysteresis);
-		if (ret)
-			return ret;
-	}
-
-	if (tz->trips && (t.temperature != trip->temperature || t.hysteresis != trip->hysteresis))
-		tz->trips[trip_id] = *trip;
-
-	thermal_notify_tz_trip_change(tz->id, trip_id, trip->type,
-				      trip->temperature, trip->hysteresis);
-
-	__thermal_zone_device_update(tz, THERMAL_TRIP_CHANGED);
-	
-	return 0;
-}
-
 /**
  * thermal_zone_device_register_with_trips() - register a new thermal zone device
  * @type:	the thermal zone device type

drivers/thermal/thermal_core.h

@@ -52,6 +52,10 @@ int for_each_thermal_cooling_device(int (*cb)(struct thermal_cooling_device *,
 int for_each_thermal_governor(int (*cb)(struct thermal_governor *, void *),
 			      void *thermal_governor);
 
+int __for_each_thermal_trip(struct thermal_zone_device *,
+			    int (*cb)(struct thermal_trip *, void *),
+			    void *);
+
 struct thermal_zone_device *thermal_zone_get_by_id(int id);
 
 struct thermal_attr {

drivers/thermal/thermal_helpers.c

@@ -146,68 +146,6 @@ int thermal_zone_get_temp(struct thermal_zone_device *tz, int *temp)
 }
 EXPORT_SYMBOL_GPL(thermal_zone_get_temp);
 
-/**
- * __thermal_zone_set_trips - Computes the next trip points for the driver
- * @tz: a pointer to a thermal zone device structure
- *
- * The function computes the next temperature boundaries by browsing
- * the trip points. The result is the closer low and high trip points
- * to the current temperature. These values are passed to the backend
- * driver to let it set its own notification mechanism (usually an
- * interrupt).
- *
- * This function must be called with tz->lock held. Both tz and tz->ops
- * must be valid pointers.
- *
- * It does not return a value
- */
-void __thermal_zone_set_trips(struct thermal_zone_device *tz)
-{
-	struct thermal_trip trip;
-	int low = -INT_MAX, high = INT_MAX;
-	int i, ret;
-
-	lockdep_assert_held(&tz->lock);
-
-	if (!tz->ops->set_trips)
-		return;
-
-	for (i = 0; i < tz->num_trips; i++) {
-		int trip_low;
-
-		ret = __thermal_zone_get_trip(tz, i , &trip);
-		if (ret)
-			return;
-
-		trip_low = trip.temperature - trip.hysteresis;
-
-		if (trip_low < tz->temperature && trip_low > low)
-			low = trip_low;
-
-		if (trip.temperature > tz->temperature &&
-		    trip.temperature < high)
-			high = trip.temperature;
-	}
-
-	/* 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);
-}
-
 static void thermal_cdev_set_cur_state(struct thermal_cooling_device *cdev,
 				       int target)
 {

drivers/thermal/thermal_trip.c

+// 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"
+
+int __for_each_thermal_trip(struct thermal_zone_device *tz,
+			    int (*cb)(struct thermal_trip *, void *),
+			    void *data)
+{
+	int i, ret;
+	struct thermal_trip trip;
+
+	lockdep_assert_held(&tz->lock);
+
+	for (i = 0; i < tz->num_trips; i++) {
+
+		ret = __thermal_zone_get_trip(tz, i, &trip);
+		if (ret)
+			return ret;
+
+		ret = cb(&trip, data);
+		if (ret)
+			return ret;
+	}
+
+	return 0;
+}
+
+int thermal_zone_get_num_trips(struct thermal_zone_device *tz)
+{
+	return tz->num_trips;
+}
+EXPORT_SYMBOL_GPL(thermal_zone_get_num_trips);
+
+/**
+ * __thermal_zone_set_trips - Computes the next trip points for the driver
+ * @tz: a pointer to a thermal zone device structure
+ *
+ * The function computes the next temperature boundaries by browsing
+ * the trip points. The result is the closer low and high trip points
+ * to the current temperature. These values are passed to the backend
+ * driver to let it set its own notification mechanism (usually an
+ * interrupt).
+ *
+ * This function must be called with tz->lock held. Both tz and tz->ops
+ * must be valid pointers.
+ *
+ * It does not return a value
+ */
+void __thermal_zone_set_trips(struct thermal_zone_device *tz)
+{
+	struct thermal_trip trip;
+	int low = -INT_MAX, high = INT_MAX;
+	int i, ret;
+
+	lockdep_assert_held(&tz->lock);
+
+	if (!tz->ops->set_trips)
+		return;
+
+	for (i = 0; i < tz->num_trips; i++) {
+		int trip_low;
+
+		ret = __thermal_zone_get_trip(tz, i , &trip);
+		if (ret)
+			return;
+
+		trip_low = trip.temperature - trip.hysteresis;
+
+		if (trip_low < tz->temperature && trip_low > low)
+			low = trip_low;
+
+		if (trip.temperature > tz->temperature &&
+		    trip.temperature < high)
+			high = trip.temperature;
+	}
+
+	/* 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_get_trip(struct thermal_zone_device *tz, int trip_id,
+			    struct thermal_trip *trip)
+{
+	int ret;
+
+	if (!tz || trip_id < 0 || trip_id >= tz->num_trips || !trip)
+		return -EINVAL;
+
+	if (tz->trips) {
+		*trip = tz->trips[trip_id];
+		return 0;
+	}
+
+	if (tz->ops->get_trip_hyst) {
+		ret = tz->ops->get_trip_hyst(tz, trip_id, &trip->hysteresis);
+		if (ret)
+			return ret;
+	} else {
+		trip->hysteresis = 0;
+	}
+
+	ret = tz->ops->get_trip_temp(tz, trip_id, &trip->temperature);
+	if (ret)
+		return ret;
+
+	return tz->ops->get_trip_type(tz, trip_id, &trip->type);
+}
+EXPORT_SYMBOL_GPL(__thermal_zone_get_trip);
+
+int thermal_zone_get_trip(struct thermal_zone_device *tz, int trip_id,
+			  struct thermal_trip *trip)
+{
+	int ret;
+
+	mutex_lock(&tz->lock);
+	ret = __thermal_zone_get_trip(tz, trip_id, trip);
+	mutex_unlock(&tz->lock);
+
+	return ret;
+}
+EXPORT_SYMBOL_GPL(thermal_zone_get_trip);
+
+int thermal_zone_set_trip(struct thermal_zone_device *tz, int trip_id,
+			  const struct thermal_trip *trip)
+{
+	struct thermal_trip t;
+	int ret;
+
+	if (!tz->ops->set_trip_temp && !tz->ops->set_trip_hyst && !tz->trips)
+		return -EINVAL;
+
+	ret = __thermal_zone_get_trip(tz, trip_id, &t);
+	if (ret)
+		return ret;
+
+	if (t.type != trip->type)
+		return -EINVAL;
+
+	if (t.temperature != trip->temperature && tz->ops->set_trip_temp) {
+		ret = tz->ops->set_trip_temp(tz, trip_id, trip->temperature);
+		if (ret)
+			return ret;
+	}
+
+	if (t.hysteresis != trip->hysteresis && tz->ops->set_trip_hyst) {
+		ret = tz->ops->set_trip_hyst(tz, trip_id, trip->hysteresis);
+		if (ret)
+			return ret;
+	}
+
+	if (tz->trips && (t.temperature != trip->temperature || t.hysteresis != trip->hysteresis))
+		tz->trips[trip_id] = *trip;
+
+	thermal_notify_tz_trip_change(tz->id, trip_id, trip->type,
+				      trip->temperature, trip->hysteresis);
+
+	__thermal_zone_device_update(tz, THERMAL_TRIP_CHANGED);
+
+	return 0;
+}