1 /*
2 * user_space.c - A simple user space Thermal events notifier
3 *
4 * Copyright (C) 2012 Intel Corp
5 * Copyright (C) 2012 Durgadoss R <durgadoss.r@intel.com>
6 *
7 * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
8 *
9 * This program is free software; you can redistribute it and/or modify
10 * it under the terms of the GNU General Public License as published by
11 * the Free Software Foundation; version 2 of the License.
12 *
13 * This program is distributed in the hope that it will be useful, but
14 * WITHOUT ANY WARRANTY; without even the implied warranty of
15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
16 * General Public License for more details.
17 *
18 * You should have received a copy of the GNU General Public License along
19 * with this program; if not, write to the Free Software Foundation, Inc.,
20 * 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
21 *
22 * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
23 */
24
25 #include <linux/thermal.h>
26 #include <linux/slab.h>
27
28 #include "thermal_core.h"
29
30 /**
31 * notify_user_space - Notifies user space about thermal events
32 * @tz - thermal_zone_device
33 * @trip - trip point index
34 *
35 * This function notifies the user space through UEvents.
36 */
notify_user_space(struct thermal_zone_device * tz,int trip)37 static int notify_user_space(struct thermal_zone_device *tz, int trip)
38 {
39 char *thermal_prop[5];
40 int i;
41
42 mutex_lock(&tz->lock);
43 thermal_prop[0] = kasprintf(GFP_KERNEL, "NAME=%s", tz->type);
44 thermal_prop[1] = kasprintf(GFP_KERNEL, "TEMP=%d", tz->temperature);
45 thermal_prop[2] = kasprintf(GFP_KERNEL, "TRIP=%d", trip);
46 thermal_prop[3] = kasprintf(GFP_KERNEL, "EVENT=%d", tz->notify_event);
47 thermal_prop[4] = NULL;
48 kobject_uevent_env(&tz->device.kobj, KOBJ_CHANGE, thermal_prop);
49 for (i = 0; i < 4; ++i)
50 kfree(thermal_prop[i]);
51 mutex_unlock(&tz->lock);
52 return 0;
53 }
54
55 static struct thermal_governor thermal_gov_user_space = {
56 .name = "user_space",
57 .throttle = notify_user_space,
58 };
59
thermal_gov_user_space_register(void)60 int thermal_gov_user_space_register(void)
61 {
62 return thermal_register_governor(&thermal_gov_user_space);
63 }
64
thermal_gov_user_space_unregister(void)65 void thermal_gov_user_space_unregister(void)
66 {
67 thermal_unregister_governor(&thermal_gov_user_space);
68 }
69
70
