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 enum thermal_trend {
  48         THERMAL_TREND_STABLE, /* temperature is stable */
  49         THERMAL_TREND_RAISING, /* temperature is raising */
  50         THERMAL_TREND_DROPPING, /* temperature is dropping */
  51 };
  52
  53 struct thermal_zone_device_ops {
  54         int (*bind) (struct thermal_zone_device *,
  55                      struct thermal_cooling_device *);
  56         int (*unbind) (struct thermal_zone_device *,
  57                        struct thermal_cooling_device *);
  58         int (*get_temp) (struct thermal_zone_device *, unsigned long *);
  59         int (*get_mode) (struct thermal_zone_device *,
  60                          enum thermal_device_mode *);
  61         int (*set_mode) (struct thermal_zone_device *,
  62                 enum thermal_device_mode);
  63         int (*get_trip_type) (struct thermal_zone_device *, int,
  64                 enum thermal_trip_type *);
  65         int (*get_trip_temp) (struct thermal_zone_device *, int,
  66                               unsigned long *);
  67         int (*set_trip_temp) (struct thermal_zone_device *, int,
  68                               unsigned long);
  69         int (*get_trip_hyst) (struct thermal_zone_device *, int,
  70                               unsigned long *);
  71         int (*set_trip_hyst) (struct thermal_zone_device *, int,
  72                               unsigned long);
  73         int (*get_crit_temp) (struct thermal_zone_device *, unsigned long *);
  74         int (*get_trend) (struct thermal_zone_device *, int,
  75                           enum thermal_trend *);
  76         int (*notify) (struct thermal_zone_device *, int,
  77                        enum thermal_trip_type);
  78 };
  79
  80 struct thermal_cooling_device_ops {
  81         int (*get_max_state) (struct thermal_cooling_device *, unsigned long *);
  82         int (*get_cur_state) (struct thermal_cooling_device *, unsigned long *);
  83         int (*set_cur_state) (struct thermal_cooling_device *, unsigned long);
  84 };
  85
  86 #define THERMAL_NO_LIMIT -1UL /* no upper/lower limit requirement */
  87
  88 #define THERMAL_TRIPS_NONE -1
  89 #define THERMAL_MAX_TRIPS 12
  90 #define THERMAL_NAME_LENGTH 20
  91 struct thermal_cooling_device {
  92         int id;
  93         char type[THERMAL_NAME_LENGTH];
  94         struct device device;
  95         void *devdata;
  96         const struct thermal_cooling_device_ops *ops;
  97         bool updated; /* true if the cooling device does not need update */
  98         struct mutex lock; /* protect thermal_instances list */
  99         struct list_head thermal_instances;
 100         struct list_head node;
 101 };
 102
 103 #define KELVIN_TO_CELSIUS(t)    (long)(((long)t-2732 >= 0) ?    \
 104                                 ((long)t-2732+5)/10 : ((long)t-2732-5)/10)
 105 #define CELSIUS_TO_KELVIN(t)    ((t)*10+2732)
 106
 107 struct thermal_attr {
 108         struct device_attribute attr;
 109         char name[THERMAL_NAME_LENGTH];
 110 };
 111
 112 struct thermal_zone_device {
 113         int id;
 114         char type[THERMAL_NAME_LENGTH];
 115         struct device device;
 116         struct thermal_attr *trip_temp_attrs;
 117         struct thermal_attr *trip_type_attrs;
 118         struct thermal_attr *trip_hyst_attrs;
 119         void *devdata;
 120         int trips;
 121         int passive_delay;
 122         int polling_delay;
 123         int temperature;
 124         int last_temperature;
 125         int passive;
 126         unsigned int forced_passive;
 127         const struct thermal_zone_device_ops *ops;
 128         struct list_head thermal_instances;
 129         struct idr idr;
 130         struct mutex lock; /* protect thermal_instances list */
 131         struct list_head node;
 132         struct delayed_work poll_queue;
 133 };
 134 /* Adding event notification support elements */
 135 #define THERMAL_GENL_FAMILY_NAME                "thermal_event"
 136 #define THERMAL_GENL_VERSION                    0x01
 137 #define THERMAL_GENL_MCAST_GROUP_NAME           "thermal_mc_group"
 138
 139 enum events {
 140         THERMAL_AUX0,
 141         THERMAL_AUX1,
 142         THERMAL_CRITICAL,
 143         THERMAL_DEV_FAULT,
 144 };
 145
 146 struct thermal_genl_event {
 147         u32 orig;
 148         enum events event;
 149 };
 150 /* attributes of thermal_genl_family */
 151 enum {
 152         THERMAL_GENL_ATTR_UNSPEC,
 153         THERMAL_GENL_ATTR_EVENT,
 154         __THERMAL_GENL_ATTR_MAX,
 155 };
 156 #define THERMAL_GENL_ATTR_MAX (__THERMAL_GENL_ATTR_MAX - 1)
 157
 158 /* commands supported by the thermal_genl_family */
 159 enum {
 160         THERMAL_GENL_CMD_UNSPEC,
 161         THERMAL_GENL_CMD_EVENT,
 162         __THERMAL_GENL_CMD_MAX,
 163 };
 164 #define THERMAL_GENL_CMD_MAX (__THERMAL_GENL_CMD_MAX - 1)
 165
 166 struct thermal_zone_device *thermal_zone_device_register(const char *, int, int,
 167                 void *, const struct thermal_zone_device_ops *, int, int);
 168 void thermal_zone_device_unregister(struct thermal_zone_device *);
 169
 170 int thermal_zone_bind_cooling_device(struct thermal_zone_device *, int,
 171                                      struct thermal_cooling_device *,
 172                                      unsigned long, unsigned long);
 173 int thermal_zone_unbind_cooling_device(struct thermal_zone_device *, int,
 174                                        struct thermal_cooling_device *);
 175 void thermal_zone_device_update(struct thermal_zone_device *);
 176 struct thermal_cooling_device *thermal_cooling_device_register(char *, void *,
 177                 const struct thermal_cooling_device_ops *);
 178 void thermal_cooling_device_unregister(struct thermal_cooling_device *);
 179
 180 #ifdef CONFIG_NET
 181 extern int thermal_generate_netlink_event(u32 orig, enum events event);
 182 #else
 183 static inline int thermal_generate_netlink_event(u32 orig, enum events event)
 184 {
 185         return 0;
 186 }
 187 #endif
 188
 189 #endif /* __THERMAL_H__ */