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 #define THERMAL_TRIPS_NONE      -1
  33 #define THERMAL_MAX_TRIPS       12
  34 #define THERMAL_NAME_LENGTH     20
  35
  36 /* No upper/lower limit requirement */
  37 #define THERMAL_NO_LIMIT        -1UL
  38
  39 /* Unit conversion macros */
  40 #define KELVIN_TO_CELSIUS(t)    (long)(((long)t-2732 >= 0) ?    \
  41                                 ((long)t-2732+5)/10 : ((long)t-2732-5)/10)
  42 #define CELSIUS_TO_KELVIN(t)    ((t)*10+2732)
  43
  44 /* Adding event notification support elements */
  45 #define THERMAL_GENL_FAMILY_NAME                "thermal_event"
  46 #define THERMAL_GENL_VERSION                    0x01
  47 #define THERMAL_GENL_MCAST_GROUP_NAME           "thermal_mc_group"
  48
  49 struct thermal_zone_device;
  50 struct thermal_cooling_device;
  51
  52 enum thermal_device_mode {
  53         THERMAL_DEVICE_DISABLED = 0,
  54         THERMAL_DEVICE_ENABLED,
  55 };
  56
  57 enum thermal_trip_type {
  58         THERMAL_TRIP_ACTIVE = 0,
  59         THERMAL_TRIP_PASSIVE,
  60         THERMAL_TRIP_HOT,
  61         THERMAL_TRIP_CRITICAL,
  62 };
  63
  64 enum thermal_trend {
  65         THERMAL_TREND_STABLE, /* temperature is stable */
  66         THERMAL_TREND_RAISING, /* temperature is raising */
  67         THERMAL_TREND_DROPPING, /* temperature is dropping */
  68 };
  69
  70 /* Events supported by Thermal Netlink */
  71 enum events {
  72         THERMAL_AUX0,
  73         THERMAL_AUX1,
  74         THERMAL_CRITICAL,
  75         THERMAL_DEV_FAULT,
  76 };
  77
  78 /* attributes of thermal_genl_family */
  79 enum {
  80         THERMAL_GENL_ATTR_UNSPEC,
  81         THERMAL_GENL_ATTR_EVENT,
  82         __THERMAL_GENL_ATTR_MAX,
  83 };
  84 #define THERMAL_GENL_ATTR_MAX (__THERMAL_GENL_ATTR_MAX - 1)
  85
  86 /* commands supported by the thermal_genl_family */
  87 enum {
  88         THERMAL_GENL_CMD_UNSPEC,
  89         THERMAL_GENL_CMD_EVENT,
  90         __THERMAL_GENL_CMD_MAX,
  91 };
  92 #define THERMAL_GENL_CMD_MAX (__THERMAL_GENL_CMD_MAX - 1)
  93
  94 struct thermal_zone_device_ops {
  95         int (*bind) (struct thermal_zone_device *,
  96                      struct thermal_cooling_device *);
  97         int (*unbind) (struct thermal_zone_device *,
  98                        struct thermal_cooling_device *);
  99         int (*get_temp) (struct thermal_zone_device *, unsigned long *);
 100         int (*get_mode) (struct thermal_zone_device *,
 101                          enum thermal_device_mode *);
 102         int (*set_mode) (struct thermal_zone_device *,
 103                 enum thermal_device_mode);
 104         int (*get_trip_type) (struct thermal_zone_device *, int,
 105                 enum thermal_trip_type *);
 106         int (*get_trip_temp) (struct thermal_zone_device *, int,
 107                               unsigned long *);
 108         int (*set_trip_temp) (struct thermal_zone_device *, int,
 109                               unsigned long);
 110         int (*get_trip_hyst) (struct thermal_zone_device *, int,
 111                               unsigned long *);
 112         int (*set_trip_hyst) (struct thermal_zone_device *, int,
 113                               unsigned long);
 114         int (*get_crit_temp) (struct thermal_zone_device *, unsigned long *);
 115         int (*get_trend) (struct thermal_zone_device *, int,
 116                           enum thermal_trend *);
 117         int (*notify) (struct thermal_zone_device *, int,
 118                        enum thermal_trip_type);
 119 };
 120
 121 struct thermal_cooling_device_ops {
 122         int (*get_max_state) (struct thermal_cooling_device *, unsigned long *);
 123         int (*get_cur_state) (struct thermal_cooling_device *, unsigned long *);
 124         int (*set_cur_state) (struct thermal_cooling_device *, unsigned long);
 125 };
 126
 127 struct thermal_cooling_device {
 128         int id;
 129         char type[THERMAL_NAME_LENGTH];
 130         struct device device;
 131         void *devdata;
 132         const struct thermal_cooling_device_ops *ops;
 133         bool updated; /* true if the cooling device does not need update */
 134         struct mutex lock; /* protect thermal_instances list */
 135         struct list_head thermal_instances;
 136         struct list_head node;
 137 };
 138
 139 struct thermal_attr {
 140         struct device_attribute attr;
 141         char name[THERMAL_NAME_LENGTH];
 142 };
 143
 144 struct thermal_zone_device {
 145         int id;
 146         char type[THERMAL_NAME_LENGTH];
 147         struct device device;
 148         struct thermal_attr *trip_temp_attrs;
 149         struct thermal_attr *trip_type_attrs;
 150         struct thermal_attr *trip_hyst_attrs;
 151         void *devdata;
 152         int trips;
 153         int passive_delay;
 154         int polling_delay;
 155         int temperature;
 156         int last_temperature;
 157         int passive;
 158         unsigned int forced_passive;
 159         const struct thermal_zone_device_ops *ops;
 160         struct list_head thermal_instances;
 161         struct idr idr;
 162         struct mutex lock; /* protect thermal_instances list */
 163         struct list_head node;
 164         struct delayed_work poll_queue;
 165 };
 166
 167 struct thermal_genl_event {
 168         u32 orig;
 169         enum events event;
 170 };
 171
 172 /* Function declarations */
 173 struct thermal_zone_device *thermal_zone_device_register(const char *, int, int,
 174                 void *, const struct thermal_zone_device_ops *, int, int);
 175 void thermal_zone_device_unregister(struct thermal_zone_device *);
 176
 177 int thermal_zone_bind_cooling_device(struct thermal_zone_device *, int,
 178                                      struct thermal_cooling_device *,
 179                                      unsigned long, unsigned long);
 180 int thermal_zone_unbind_cooling_device(struct thermal_zone_device *, int,
 181                                        struct thermal_cooling_device *);
 182 void thermal_zone_device_update(struct thermal_zone_device *);
 183
 184 struct thermal_cooling_device *thermal_cooling_device_register(char *, void *,
 185                 const struct thermal_cooling_device_ops *);
 186 void thermal_cooling_device_unregister(struct thermal_cooling_device *);
 187
 188 #ifdef CONFIG_NET
 189 extern int thermal_generate_netlink_event(u32 orig, enum events event);
 190 #else
 191 static inline int thermal_generate_netlink_event(u32 orig, enum events event)
 192 {
 193         return 0;
 194 }
 195 #endif
 196
 197 #endif /* __THERMAL_H__ */