linux-kernel - [PATCH 1/2] thermal: Add support for cooling device bind/unbind operations

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Date:   Thu,  9 Feb 2023 17:35:54 +0100
From:   Thierry Reding <thierry.reding@...il.com>
To:     "Rafael J . Wysocki" <rafael@...nel.org>,
        Daniel Lezcano <daniel.lezcano@...aro.org>
Cc:     Amit Kucheria <amitk@...nel.org>, Zhang Rui <rui.zhang@...el.com>,
        Jon Hunter <jonathanh@...dia.com>, linux-pm@...r.kernel.org,
        linux-tegra@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [PATCH 1/2] thermal: Add support for cooling device bind/unbind operations

From: Thierry Reding <treding@...dia.com>

Drivers for cooling devices can implement these operations when they
need to perform extra work at the time when a cooling device is bound to
a given thermal zone.

Signed-off-by: Thierry Reding <treding@...dia.com>
---
 drivers/thermal/thermal_core.c | 11 +++++++++++
 include/linux/thermal.h        |  6 ++++++
 2 files changed, 17 insertions(+)

diff --git a/drivers/thermal/thermal_core.c b/drivers/thermal/thermal_core.c
index 0675df54c8e6..627fccd100ef 100644
--- a/drivers/thermal/thermal_core.c
+++ b/drivers/thermal/thermal_core.c
@@ -694,6 +694,14 @@ int thermal_zone_bind_cooling_device(struct thermal_zone_device *tz,
 	mutex_unlock(&cdev->lock);
 	mutex_unlock(&tz->lock);
 
+	if (cdev->ops->bind) {
+		result = cdev->ops->bind(cdev, tz, trip, upper, lower, weight);
+		if (result < 0) {
+			pr_err("failed to bind %s to %s: %d\n", cdev->type,
+			       tz->type, result);
+		}
+	}
+
 	if (!result)
 		return 0;
 
@@ -730,6 +738,9 @@ int thermal_zone_unbind_cooling_device(struct thermal_zone_device *tz,
 {
 	struct thermal_instance *pos, *next;
 
+	if (cdev->ops->unbind)
+		cdev->ops->unbind(cdev, tz, trip);
+
 	mutex_lock(&tz->lock);
 	mutex_lock(&cdev->lock);
 	list_for_each_entry_safe(pos, next, &tz->thermal_instances, tz_node) {
diff --git a/include/linux/thermal.h b/include/linux/thermal.h
index 2bb4bf33f4f3..95ed8a0cbba8 100644
--- a/include/linux/thermal.h
+++ b/include/linux/thermal.h
@@ -89,6 +89,12 @@ struct thermal_trip {
 };
 
 struct thermal_cooling_device_ops {
+	int (*bind)(struct thermal_cooling_device *cdev,
+		    struct thermal_zone_device *tz, int trip_id,
+		    unsigned long upper, unsigned long lower,
+		    unsigned int weight);
+	void (*unbind)(struct thermal_cooling_device *cdev,
+		       struct thermal_zone_device *tz, int trip_id);
 	int (*get_max_state) (struct thermal_cooling_device *, unsigned long *);
 	int (*get_cur_state) (struct thermal_cooling_device *, unsigned long *);
 	int (*set_cur_state) (struct thermal_cooling_device *, unsigned long);
-- 
2.39.1