1 // SPDX-License-Identifier: GPL-2.0-only 2 /* 3 * user_space.c - A simple user space Thermal events notifier 4 * 5 * Copyright (C) 2012 Intel Corp 6 * Copyright (C) 2012 Durgadoss R <durgadoss.r@intel.com> 7 * 8 * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ 9 * 10 * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ 11 */ 12 13 #include <linux/slab.h> 14 #include <linux/thermal.h> 15 16 #include "thermal_core.h" 17 18 /** 19 * notify_user_space - Notifies user space about thermal events 20 * @tz: thermal_zone_device 21 * @trip: trip point index 22 * 23 * This function notifies the user space through UEvents. 24 */ 25 static int notify_user_space(struct thermal_zone_device *tz, int trip) 26 { 27 char *thermal_prop[5]; 28 int i; 29 30 mutex_lock(&tz->lock); 31 thermal_prop[0] = kasprintf(GFP_KERNEL, "NAME=%s", tz->type); 32 thermal_prop[1] = kasprintf(GFP_KERNEL, "TEMP=%d", tz->temperature); 33 thermal_prop[2] = kasprintf(GFP_KERNEL, "TRIP=%d", trip); 34 thermal_prop[3] = kasprintf(GFP_KERNEL, "EVENT=%d", tz->notify_event); 35 thermal_prop[4] = NULL; 36 kobject_uevent_env(&tz->device.kobj, KOBJ_CHANGE, thermal_prop); 37 for (i = 0; i < 4; ++i) 38 kfree(thermal_prop[i]); 39 mutex_unlock(&tz->lock); 40 return 0; 41 } 42 43 static struct thermal_governor thermal_gov_user_space = { 44 .name = "user_space", 45 .throttle = notify_user_space, 46 }; 47 THERMAL_GOVERNOR_DECLARE(thermal_gov_user_space); 48