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 /* invalid cooling state */
  37 #define THERMAL_CSTATE_INVALID -1UL
  38
  39 /* No upper/lower limit requirement */
  40 #define THERMAL_NO_LIMIT        THERMAL_CSTATE_INVALID
  41
  42 /* Unit conversion macros */
  43 #define KELVIN_TO_CELSIUS(t)    (long)(((long)t-2732 >= 0) ?    \
  44                                 ((long)t-2732+5)/10 : ((long)t-2732-5)/10)
  45 #define CELSIUS_TO_KELVIN(t)    ((t)*10+2732)
  46
  47 /* Adding event notification support elements */
  48 #define THERMAL_GENL_FAMILY_NAME                "thermal_event"
  49 #define THERMAL_GENL_VERSION                    0x01
  50 #define THERMAL_GENL_MCAST_GROUP_NAME           "thermal_mc_grp"
  51
  52 /* Default Thermal Governor */
  53 #if defined(CONFIG_THERMAL_DEFAULT_GOV_STEP_WISE)
  54 #define DEFAULT_THERMAL_GOVERNOR       "step_wise"
  55 #elif defined(CONFIG_THERMAL_DEFAULT_GOV_FAIR_SHARE)
  56 #define DEFAULT_THERMAL_GOVERNOR       "fair_share"
  57 #elif defined(CONFIG_THERMAL_DEFAULT_GOV_USER_SPACE)
  58 #define DEFAULT_THERMAL_GOVERNOR       "user_space"
  59 #endif
  60
  61 struct thermal_zone_device;
  62 struct thermal_cooling_device;
  63
  64 enum thermal_device_mode {
  65         THERMAL_DEVICE_DISABLED = 0,
  66         THERMAL_DEVICE_ENABLED,
  67 };
  68
  69 enum thermal_trip_type {
  70         THERMAL_TRIP_ACTIVE = 0,
  71         THERMAL_TRIP_PASSIVE,
  72         THERMAL_TRIP_HOT,
  73         THERMAL_TRIP_CRITICAL,
  74 };
  75
  76 enum thermal_trend {
  77         THERMAL_TREND_STABLE, /* temperature is stable */
  78         THERMAL_TREND_RAISING, /* temperature is raising */
  79         THERMAL_TREND_DROPPING, /* temperature is dropping */
  80         THERMAL_TREND_RAISE_FULL, /* apply highest cooling action */
  81         THERMAL_TREND_DROP_FULL, /* apply lowest cooling action */
  82 };
  83
  84 /* Events supported by Thermal Netlink */
  85 enum events {
  86         THERMAL_AUX0,
  87         THERMAL_AUX1,
  88         THERMAL_CRITICAL,
  89         THERMAL_DEV_FAULT,
  90 };
  91
  92 /* attributes of thermal_genl_family */
  93 enum {
  94         THERMAL_GENL_ATTR_UNSPEC,
  95         THERMAL_GENL_ATTR_EVENT,
  96         __THERMAL_GENL_ATTR_MAX,
  97 };
  98 #define THERMAL_GENL_ATTR_MAX (__THERMAL_GENL_ATTR_MAX - 1)
  99
 100 /* commands supported by the thermal_genl_family */
 101 enum {
 102         THERMAL_GENL_CMD_UNSPEC,
 103         THERMAL_GENL_CMD_EVENT,
 104         __THERMAL_GENL_CMD_MAX,
 105 };
 106 #define THERMAL_GENL_CMD_MAX (__THERMAL_GENL_CMD_MAX - 1)
 107
 108 struct thermal_zone_device_ops {
 109         int (*bind) (struct thermal_zone_device *,
 110                      struct thermal_cooling_device *);
 111         int (*unbind) (struct thermal_zone_device *,
 112                        struct thermal_cooling_device *);
 113         int (*get_temp) (struct thermal_zone_device *, unsigned long *);
 114         int (*get_mode) (struct thermal_zone_device *,
 115                          enum thermal_device_mode *);
 116         int (*set_mode) (struct thermal_zone_device *,
 117                 enum thermal_device_mode);
 118         int (*get_trip_type) (struct thermal_zone_device *, int,
 119                 enum thermal_trip_type *);
 120         int (*get_trip_temp) (struct thermal_zone_device *, int,
 121                               unsigned long *);
 122         int (*set_trip_temp) (struct thermal_zone_device *, int,
 123                               unsigned long);
 124         int (*get_trip_hyst) (struct thermal_zone_device *, int,
 125                               unsigned long *);
 126         int (*set_trip_hyst) (struct thermal_zone_device *, int,
 127                               unsigned long);
 128         int (*get_crit_temp) (struct thermal_zone_device *, unsigned long *);
 129         int (*set_emul_temp) (struct thermal_zone_device *, unsigned long);
 130         int (*get_trend) (struct thermal_zone_device *, int,
 131                           enum thermal_trend *);
 132         int (*notify) (struct thermal_zone_device *, int,
 133                        enum thermal_trip_type);
 134 };
 135
 136 struct thermal_cooling_device_ops {
 137         int (*get_max_state) (struct thermal_cooling_device *, unsigned long *);
 138         int (*get_cur_state) (struct thermal_cooling_device *, unsigned long *);
 139         int (*set_cur_state) (struct thermal_cooling_device *, unsigned long);
 140 };
 141
 142 struct thermal_cooling_device {
 143         int id;
 144         char type[THERMAL_NAME_LENGTH];
 145         struct device device;
 146         void *devdata;
 147         const struct thermal_cooling_device_ops *ops;
 148         bool updated; /* true if the cooling device does not need update */
 149         struct mutex lock; /* protect thermal_instances list */
 150         struct list_head thermal_instances;
 151         struct list_head node;
 152 };
 153
 154 struct thermal_attr {
 155         struct device_attribute attr;
 156         char name[THERMAL_NAME_LENGTH];
 157 };
 158
 159 struct thermal_zone_device {
 160         int id;
 161         char type[THERMAL_NAME_LENGTH];
 162         struct device device;
 163         struct thermal_attr *trip_temp_attrs;
 164         struct thermal_attr *trip_type_attrs;
 165         struct thermal_attr *trip_hyst_attrs;
 166         void *devdata;
 167         int trips;
 168         int passive_delay;
 169         int polling_delay;
 170         int temperature;
 171         int last_temperature;
 172         int emul_temperature;
 173         int passive;
 174         unsigned int forced_passive;
 175         const struct thermal_zone_device_ops *ops;
 176         const struct thermal_zone_params *tzp;
 177         struct thermal_governor *governor;
 178         struct list_head thermal_instances;
 179         struct idr idr;
 180         struct mutex lock; /* protect thermal_instances list */
 181         struct list_head node;
 182         struct delayed_work poll_queue;
 183 };
 184
 185 /* Structure that holds thermal governor information */
 186 struct thermal_governor {
 187         char name[THERMAL_NAME_LENGTH];
 188         int (*throttle)(struct thermal_zone_device *tz, int trip);
 189         struct list_head        governor_list;
 190 };
 191
 192 /* Structure that holds binding parameters for a zone */
 193 struct thermal_bind_params {
 194         struct thermal_cooling_device *cdev;
 195
 196         /*
 197          * This is a measure of 'how effectively these devices can
 198          * cool 'this' thermal zone. The shall be determined by platform
 199          * characterization. This is on a 'percentage' scale.
 200          * See Documentation/thermal/sysfs-api.txt for more information.
 201          */
 202         int weight;
 203
 204         /*
 205          * This is a bit mask that gives the binding relation between this
 206          * thermal zone and cdev, for a particular trip point.
 207          * See Documentation/thermal/sysfs-api.txt for more information.
 208          */
 209         int trip_mask;
 210         int (*match) (struct thermal_zone_device *tz,
 211                         struct thermal_cooling_device *cdev);
 212 };
 213
 214 /* Structure to define Thermal Zone parameters */
 215 struct thermal_zone_params {
 216         char governor_name[THERMAL_NAME_LENGTH];
 217         int num_tbps;   /* Number of tbp entries */
 218         struct thermal_bind_params *tbp;
 219 };
 220
 221 struct thermal_genl_event {
 222         u32 orig;
 223         enum events event;
 224 };
 225
 226 /* Function declarations */
 227 struct thermal_zone_device *thermal_zone_device_register(const char *, int, int,
 228                 void *, const struct thermal_zone_device_ops *,
 229                 const struct thermal_zone_params *, int, int);
 230 void thermal_zone_device_unregister(struct thermal_zone_device *);
 231
 232 int thermal_zone_bind_cooling_device(struct thermal_zone_device *, int,
 233                                      struct thermal_cooling_device *,
 234                                      unsigned long, unsigned long);
 235 int thermal_zone_unbind_cooling_device(struct thermal_zone_device *, int,
 236                                        struct thermal_cooling_device *);
 237 void thermal_zone_device_update(struct thermal_zone_device *);
 238
 239 struct thermal_cooling_device *thermal_cooling_device_register(char *, void *,
 240                 const struct thermal_cooling_device_ops *);
 241 void thermal_cooling_device_unregister(struct thermal_cooling_device *);
 242 struct thermal_zone_device *thermal_zone_get_zone_by_name(const char *name);
 243 int thermal_zone_get_temp(struct thermal_zone_device *tz, unsigned long *temp);
 244
 245 int get_tz_trend(struct thermal_zone_device *, int);
 246 struct thermal_instance *get_thermal_instance(struct thermal_zone_device *,
 247                 struct thermal_cooling_device *, int);
 248 void thermal_cdev_update(struct thermal_cooling_device *);
 249 void thermal_notify_framework(struct thermal_zone_device *, int);
 250
 251 #ifdef CONFIG_NET
 252 extern int thermal_generate_netlink_event(struct thermal_zone_device *tz,
 253                                                 enum events event);
 254 #else
 255 static inline int thermal_generate_netlink_event(struct thermal_zone_device *tz,
 256                                                 enum events event)
 257 {
 258         return 0;
 259 }
 260 #endif
 261
 262 #endif /* __THERMAL_H__ */