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 static int user_space_bind(struct thermal_zone_device *tz) 19 { 20 pr_info_once("Consider using thermal netlink events interface\n"); 21 22 return 0; 23 } 24 25 /** 26 * notify_user_space - Notifies user space about thermal events 27 * @tz: thermal_zone_device 28 * @trip: trip point 29 * 30 * This function notifies the user space through UEvents. 31 */ 32 static int notify_user_space(struct thermal_zone_device *tz, 33 const struct thermal_trip *trip) 34 { 35 char *thermal_prop[5]; 36 int i; 37 38 lockdep_assert_held(&tz->lock); 39 40 thermal_prop[0] = kasprintf(GFP_KERNEL, "NAME=%s", tz->type); 41 thermal_prop[1] = kasprintf(GFP_KERNEL, "TEMP=%d", tz->temperature); 42 thermal_prop[2] = kasprintf(GFP_KERNEL, "TRIP=%d", 43 thermal_zone_trip_id(tz, trip)); 44 thermal_prop[3] = kasprintf(GFP_KERNEL, "EVENT=%d", tz->notify_event); 45 thermal_prop[4] = NULL; 46 kobject_uevent_env(&tz->device.kobj, KOBJ_CHANGE, thermal_prop); 47 for (i = 0; i < 4; ++i) 48 kfree(thermal_prop[i]); 49 50 return 0; 51 } 52 53 static struct thermal_governor thermal_gov_user_space = { 54 .name = "user_space", 55 .throttle = notify_user_space, 56 .bind_to_tz = user_space_bind, 57 }; 58 THERMAL_GOVERNOR_DECLARE(thermal_gov_user_space); 59