mm, PM/Freezer: Disable OOM killer when tasks are frozen
[linux-2.6.git] / include / linux / thermal.h
1 /*
2  *  thermal.h  ($Revision: 0 $)
3  *
4  *  Copyright (C) 2008  Intel Corp
5  *  Copyright (C) 2008  Zhang Rui <rui.zhang@intel.com>
6  *  Copyright (C) 2008  Sujith Thomas <sujith.thomas@intel.com>
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 #ifndef __THERMAL_H__
26 #define __THERMAL_H__
27
28 #include <linux/idr.h>
29 #include <linux/device.h>
30 #include <linux/workqueue.h>
31
32 struct thermal_zone_device;
33 struct thermal_cooling_device;
34
35 enum thermal_device_mode {
36         THERMAL_DEVICE_DISABLED = 0,
37         THERMAL_DEVICE_ENABLED,
38 };
39
40 enum thermal_trip_type {
41         THERMAL_TRIP_ACTIVE = 0,
42         THERMAL_TRIP_PASSIVE,
43         THERMAL_TRIP_HOT,
44         THERMAL_TRIP_CRITICAL,
45 };
46
47 struct thermal_zone_device_ops {
48         int (*bind) (struct thermal_zone_device *,
49                      struct thermal_cooling_device *);
50         int (*unbind) (struct thermal_zone_device *,
51                        struct thermal_cooling_device *);
52         int (*get_temp) (struct thermal_zone_device *, unsigned long *);
53         int (*get_mode) (struct thermal_zone_device *,
54                          enum thermal_device_mode *);
55         int (*set_mode) (struct thermal_zone_device *,
56                 enum thermal_device_mode);
57         int (*get_trip_type) (struct thermal_zone_device *, int,
58                 enum thermal_trip_type *);
59         int (*get_trip_temp) (struct thermal_zone_device *, int,
60                               unsigned long *);
61         int (*get_crit_temp) (struct thermal_zone_device *, unsigned long *);
62         int (*notify) (struct thermal_zone_device *, int,
63                        enum thermal_trip_type);
64 };
65
66 struct thermal_cooling_device_ops {
67         int (*get_max_state) (struct thermal_cooling_device *, unsigned long *);
68         int (*get_cur_state) (struct thermal_cooling_device *, unsigned long *);
69         int (*set_cur_state) (struct thermal_cooling_device *, unsigned long);
70 };
71
72 #define THERMAL_TRIPS_NONE -1
73 #define THERMAL_MAX_TRIPS 12
74 #define THERMAL_NAME_LENGTH 20
75 struct thermal_cooling_device {
76         int id;
77         char type[THERMAL_NAME_LENGTH];
78         struct device device;
79         void *devdata;
80         struct thermal_cooling_device_ops *ops;
81         struct list_head node;
82 };
83
84 #define KELVIN_TO_CELSIUS(t)    (long)(((long)t-2732 >= 0) ?    \
85                                 ((long)t-2732+5)/10 : ((long)t-2732-5)/10)
86 #define CELSIUS_TO_KELVIN(t)    ((t)*10+2732)
87
88 #if defined(CONFIG_THERMAL_HWMON)
89 /* thermal zone devices with the same type share one hwmon device */
90 struct thermal_hwmon_device {
91         char type[THERMAL_NAME_LENGTH];
92         struct device *device;
93         int count;
94         struct list_head tz_list;
95         struct list_head node;
96 };
97
98 struct thermal_hwmon_attr {
99         struct device_attribute attr;
100         char name[16];
101 };
102 #endif
103
104 struct thermal_zone_device {
105         int id;
106         char type[THERMAL_NAME_LENGTH];
107         struct device device;
108         void *devdata;
109         int trips;
110         int tc1;
111         int tc2;
112         int passive_delay;
113         int polling_delay;
114         int last_temperature;
115         bool passive;
116         unsigned int forced_passive;
117         struct thermal_zone_device_ops *ops;
118         struct list_head cooling_devices;
119         struct idr idr;
120         struct mutex lock;      /* protect cooling devices list */
121         struct list_head node;
122         struct delayed_work poll_queue;
123 #if defined(CONFIG_THERMAL_HWMON)
124         struct list_head hwmon_node;
125         struct thermal_hwmon_device *hwmon;
126         struct thermal_hwmon_attr temp_input;   /* hwmon sys attr */
127         struct thermal_hwmon_attr temp_crit;    /* hwmon sys attr */
128 #endif
129 };
130
131 struct thermal_zone_device *thermal_zone_device_register(char *, int, void *,
132                                                          struct
133                                                          thermal_zone_device_ops
134                                                          *, int tc1, int tc2,
135                                                          int passive_freq,
136                                                          int polling_freq);
137 void thermal_zone_device_unregister(struct thermal_zone_device *);
138
139 int thermal_zone_bind_cooling_device(struct thermal_zone_device *, int,
140                                      struct thermal_cooling_device *);
141 int thermal_zone_unbind_cooling_device(struct thermal_zone_device *, int,
142                                        struct thermal_cooling_device *);
143 void thermal_zone_device_update(struct thermal_zone_device *);
144 struct thermal_cooling_device *thermal_cooling_device_register(char *, void *,
145                                                                struct
146                                                                thermal_cooling_device_ops
147                                                                *);
148 void thermal_cooling_device_unregister(struct thermal_cooling_device *);
149
150 #endif /* __THERMAL_H__ */