drivers/thermal/gov_user_space.c

0001 // SPDX-License-Identifier: GPL-2.0-only
0002 /*
0003  *  user_space.c - A simple user space Thermal events notifier
0004  *
0005  *  Copyright (C) 2012 Intel Corp
0006  *  Copyright (C) 2012 Durgadoss R <durgadoss.r@intel.com>
0007  *
0008  *  ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
0009  *
0010  * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
0011  */
0012
0013 #include <linux/slab.h>
0014 #include <linux/thermal.h>
0015
0016 #include "thermal_core.h"
0017
0018 static int user_space_bind(struct thermal_zone_device *tz)
0019 {
0020     pr_info_once("Consider using thermal netlink events interface\n");
0021
0022     return 0;
0023 }
0024
0025 /**
0026  * notify_user_space - Notifies user space about thermal events
0027  * @tz: thermal_zone_device
0028  * @trip: trip point index
0029  *
0030  * This function notifies the user space through UEvents.
0031  */
0032 static int notify_user_space(struct thermal_zone_device *tz, int trip)
0033 {
0034     char *thermal_prop[5];
0035     int i;
0036
0037     mutex_lock(&tz->lock);
0038     thermal_prop[0] = kasprintf(GFP_KERNEL, "NAME=%s", tz->type);
0039     thermal_prop[1] = kasprintf(GFP_KERNEL, "TEMP=%d", tz->temperature);
0040     thermal_prop[2] = kasprintf(GFP_KERNEL, "TRIP=%d", trip);
0041     thermal_prop[3] = kasprintf(GFP_KERNEL, "EVENT=%d", tz->notify_event);
0042     thermal_prop[4] = NULL;
0043     kobject_uevent_env(&tz->device.kobj, KOBJ_CHANGE, thermal_prop);
0044     for (i = 0; i < 4; ++i)
0045         kfree(thermal_prop[i]);
0046     mutex_unlock(&tz->lock);
0047     return 0;
0048 }
0049
0050 static struct thermal_governor thermal_gov_user_space = {
0051     .name       = "user_space",
0052     .throttle   = notify_user_space,
0053     .bind_to_tz = user_space_bind,
0054 };
0055 THERMAL_GOVERNOR_DECLARE(thermal_gov_user_space);