linux-kernel - [PATCH v4 04/10] thermal: core: Add thermal_zone_update_trip

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Date:   Fri, 04 Aug 2023 23:05:40 +0200
From:   "Rafael J. Wysocki" <rjw@...ysocki.net>
To:     Linux ACPI <linux-acpi@...r.kernel.org>,
        Daniel Lezcano <daniel.lezcano@...aro.org>
Cc:     LKML <linux-kernel@...r.kernel.org>,
        Linux PM <linux-pm@...r.kernel.org>,
        Michal Wilczynski <michal.wilczynski@...el.com>,
        Zhang Rui <rui.zhang@...el.com>,
        Srinivas Pandruvada <srinivas.pandruvada@...ux.intel.com>
Subject: [PATCH v4 04/10] thermal: core: Add thermal_zone_update_trip_temp() helper routine

From: Rafael J. Wysocki <rafael.j.wysocki@...el.com>

Introduce a helper routine called thermal_zone_update_trip_temp() that
can be used to update a trip point's temperature with the help of a
pointer to local data associated with that trip point provided by
the thermal driver that created it.

Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@...el.com>
---

New patch in v4.

---
 drivers/thermal/thermal_trip.c |   37 +++++++++++++++++++++++++++++++++++++
 include/linux/thermal.h        |    4 ++++
 2 files changed, 41 insertions(+)

Index: linux-pm/drivers/thermal/thermal_trip.c
===================================================================
--- linux-pm.orig/drivers/thermal/thermal_trip.c
+++ linux-pm/drivers/thermal/thermal_trip.c
@@ -180,3 +180,40 @@ int thermal_zone_set_trip(struct thermal
 
 	return 0;
 }
+
+/**
+ * thermal_zone_update_trip_temp - Update the trip point temperature.
+ * @tz: Thermal zone.
+ * @trip_priv: Trip tag.
+ * @temp: New trip temperature.
+ *
+ * This only works for thermal zones using trip tables and its caller must
+ * ensure that the zone lock is held before using it.
+ *
+ * @trip_priv is expected to be the value that has been stored by the driver
+ * in the struct thermal_trip representing the trip point in question, so it
+ * can be matched against the value of the priv field in that structure.
+ *
+ * If @trip_priv does not match any trip point in the trip table of @tz,
+ * nothing happens.
+ */
+void thermal_zone_update_trip_temp(struct thermal_zone_device *tz,
+				   void *trip_priv, int temperature)
+{
+	int i;
+
+	lockdep_assert_held(&tz->lock);
+
+	if (!tz->trips || !trip_priv)
+		return;
+
+	for (i = 0; i < tz->num_trips; i++) {
+		struct thermal_trip *trip = &tz->trips[i];
+
+		if (trip->priv == trip_priv) {
+			trip->temperature = temperature;
+			return;
+		}
+	}
+}
+EXPORT_SYMBOL_GPL(thermal_zone_update_trip_temp);
Index: linux-pm/include/linux/thermal.h
===================================================================
--- linux-pm.orig/include/linux/thermal.h
+++ linux-pm/include/linux/thermal.h
@@ -286,9 +286,13 @@ int __thermal_zone_get_trip(struct therm
 			    struct thermal_trip *trip);
 int thermal_zone_get_trip(struct thermal_zone_device *tz, int trip_id,
 			  struct thermal_trip *trip);
+void thermal_zone_update_trip_temp(struct thermal_zone_device *tz,
+				   void *trip_priv, int temperature);
 
 int thermal_zone_set_trip(struct thermal_zone_device *tz, int trip_id,
 			  const struct thermal_trip *trip);
+void thermal_zone_update_trip_temp(struct thermal_zone_device *tz,
+				   void *trip_priv, int temperature);
 
 int thermal_zone_get_num_trips(struct thermal_zone_device *tz);