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/of.h>
  29 #include <linux/idr.h>
  30 #include <linux/device.h>
  31 #include <linux/workqueue.h>
  32
  33 #define THERMAL_TRIPS_NONE      -1
  34 #define THERMAL_MAX_TRIPS       12
  35 #define THERMAL_NAME_LENGTH     20
  36
  37 /* invalid cooling state */
  38 #define THERMAL_CSTATE_INVALID -1UL
  39
  40 /* No upper/lower limit requirement */
  41 #define THERMAL_NO_LIMIT        THERMAL_CSTATE_INVALID
  42
  43 /* Unit conversion macros */
  44 #define KELVIN_TO_CELSIUS(t)    (long)(((long)t-2732 >= 0) ?    \
  45                                 ((long)t-2732+5)/10 : ((long)t-2732-5)/10)
  46 #define CELSIUS_TO_KELVIN(t)    ((t)*10+2732)
  47 #define DECI_KELVIN_TO_MILLICELSIUS_WITH_OFFSET(t, off) (((t) - (off)) * 100)
  48 #define DECI_KELVIN_TO_MILLICELSIUS(t) DECI_KELVIN_TO_MILLICELSIUS_WITH_OFFSET(t, 2732)
  49 #define MILLICELSIUS_TO_DECI_KELVIN_WITH_OFFSET(t, off) (((t) / 100) + (off))
  50 #define MILLICELSIUS_TO_DECI_KELVIN(t) MILLICELSIUS_TO_DECI_KELVIN_WITH_OFFSET(t, 2732)
  51
  52 /* Adding event notification support elements */
  53 #define THERMAL_GENL_FAMILY_NAME                "thermal_event"
  54 #define THERMAL_GENL_VERSION                    0x01
  55 #define THERMAL_GENL_MCAST_GROUP_NAME           "thermal_mc_grp"
  56
  57 /* Default Thermal Governor */
  58 #if defined(CONFIG_THERMAL_DEFAULT_GOV_STEP_WISE)
  59 #define DEFAULT_THERMAL_GOVERNOR       "step_wise"
  60 #elif defined(CONFIG_THERMAL_DEFAULT_GOV_FAIR_SHARE)
  61 #define DEFAULT_THERMAL_GOVERNOR       "fair_share"
  62 #elif defined(CONFIG_THERMAL_DEFAULT_GOV_USER_SPACE)
  63 #define DEFAULT_THERMAL_GOVERNOR       "user_space"
  64 #endif
  65
  66 struct thermal_zone_device;
  67 struct thermal_cooling_device;
  68
  69 enum thermal_device_mode {
  70         THERMAL_DEVICE_DISABLED = 0,
  71         THERMAL_DEVICE_ENABLED,
  72 };
  73
  74 enum thermal_trip_type {
  75         THERMAL_TRIP_ACTIVE = 0,
  76         THERMAL_TRIP_PASSIVE,
  77         THERMAL_TRIP_HOT,
  78         THERMAL_TRIP_CRITICAL,
  79 };
  80
  81 enum thermal_trend {
  82         THERMAL_TREND_STABLE, /* temperature is stable */
  83         THERMAL_TREND_RAISING, /* temperature is raising */
  84         THERMAL_TREND_DROPPING, /* temperature is dropping */
  85         THERMAL_TREND_RAISE_FULL, /* apply highest cooling action */
  86         THERMAL_TREND_DROP_FULL, /* apply lowest cooling action */
  87 };
  88
  89 /* Events supported by Thermal Netlink */
  90 enum events {
  91         THERMAL_AUX0,
  92         THERMAL_AUX1,
  93         THERMAL_CRITICAL,
  94         THERMAL_DEV_FAULT,
  95 };
  96
  97 /* attributes of thermal_genl_family */
  98 enum {
  99         THERMAL_GENL_ATTR_UNSPEC,
 100         THERMAL_GENL_ATTR_EVENT,
 101         __THERMAL_GENL_ATTR_MAX,
 102 };
 103 #define THERMAL_GENL_ATTR_MAX (__THERMAL_GENL_ATTR_MAX - 1)
 104
 105 /* commands supported by the thermal_genl_family */
 106 enum {
 107         THERMAL_GENL_CMD_UNSPEC,
 108         THERMAL_GENL_CMD_EVENT,
 109         __THERMAL_GENL_CMD_MAX,
 110 };
 111 #define THERMAL_GENL_CMD_MAX (__THERMAL_GENL_CMD_MAX - 1)
 112
 113 struct thermal_zone_device_ops {
 114         int (*bind) (struct thermal_zone_device *,
 115                      struct thermal_cooling_device *);
 116         int (*unbind) (struct thermal_zone_device *,
 117                        struct thermal_cooling_device *);
 118         int (*get_temp) (struct thermal_zone_device *, unsigned long *);
 119         int (*get_mode) (struct thermal_zone_device *,
 120                          enum thermal_device_mode *);
 121         int (*set_mode) (struct thermal_zone_device *,
 122                 enum thermal_device_mode);
 123         int (*get_trip_type) (struct thermal_zone_device *, int,
 124                 enum thermal_trip_type *);
 125         int (*get_trip_temp) (struct thermal_zone_device *, int,
 126                               unsigned long *);
 127         int (*set_trip_temp) (struct thermal_zone_device *, int,
 128                               unsigned long);
 129         int (*get_trip_hyst) (struct thermal_zone_device *, int,
 130                               unsigned long *);
 131         int (*set_trip_hyst) (struct thermal_zone_device *, int,
 132                               unsigned long);
 133         int (*get_crit_temp) (struct thermal_zone_device *, unsigned long *);
 134         int (*set_emul_temp) (struct thermal_zone_device *, unsigned long);
 135         int (*get_trend) (struct thermal_zone_device *, int,
 136                           enum thermal_trend *);
 137         int (*notify) (struct thermal_zone_device *, int,
 138                        enum thermal_trip_type);
 139 };
 140
 141 struct thermal_cooling_device_ops {
 142         int (*get_max_state) (struct thermal_cooling_device *, unsigned long *);
 143         int (*get_cur_state) (struct thermal_cooling_device *, unsigned long *);
 144         int (*set_cur_state) (struct thermal_cooling_device *, unsigned long);
 145 };
 146
 147 struct thermal_cooling_device {
 148         int id;
 149         char type[THERMAL_NAME_LENGTH];
 150         struct device device;
 151         struct device_node *np;
 152         void *devdata;
 153         const struct thermal_cooling_device_ops *ops;
 154         bool updated; /* true if the cooling device does not need update */
 155         struct mutex lock; /* protect thermal_instances list */
 156         struct list_head thermal_instances;
 157         struct list_head node;
 158 };
 159
 160 struct thermal_attr {
 161         struct device_attribute attr;
 162         char name[THERMAL_NAME_LENGTH];
 163 };
 164
 165 /**
 166  * struct thermal_zone_device - structure for a thermal zone
 167  * @id:         unique id number for each thermal zone
 168  * @type:       the thermal zone device type
 169  * @device:     &struct device for this thermal zone
 170  * @trip_temp_attrs:    attributes for trip points for sysfs: trip temperature
 171  * @trip_type_attrs:    attributes for trip points for sysfs: trip type
 172  * @trip_hyst_attrs:    attributes for trip points for sysfs: trip hysteresis
 173  * @devdata:    private pointer for device private data
 174  * @trips:      number of trip points the thermal zone supports
 175  * @passive_delay:      number of milliseconds to wait between polls when
 176  *                      performing passive cooling.  Currenty only used by the
 177  *                      step-wise governor
 178  * @polling_delay:      number of milliseconds to wait between polls when
 179  *                      checking whether trip points have been crossed (0 for
 180  *                      interrupt driven systems)
 181  * @temperature:        current temperature.  This is only for core code,
 182  *                      drivers should use thermal_zone_get_temp() to get the
 183  *                      current temperature
 184  * @last_temperature:   previous temperature read
 185  * @emul_temperature:   emulated temperature when using CONFIG_THERMAL_EMULATION
 186  * @passive:            1 if you've crossed a passive trip point, 0 otherwise.
 187  *                      Currenty only used by the step-wise governor.
 188  * @forced_passive:     If > 0, temperature at which to switch on all ACPI
 189  *                      processor cooling devices.  Currently only used by the
 190  *                      step-wise governor.
 191  * @ops:        operations this &thermal_zone_device supports
 192  * @tzp:        thermal zone parameters
 193  * @governor:   pointer to the governor for this thermal zone
 194  * @thermal_instances:  list of &struct thermal_instance of this thermal zone
 195  * @idr:        &struct idr to generate unique id for this zone's cooling
 196  *              devices
 197  * @lock:       lock to protect thermal_instances list
 198  * @node:       node in thermal_tz_list (in thermal_core.c)
 199  * @poll_queue: delayed work for polling
 200  */
 201 struct thermal_zone_device {
 202         int id;
 203         char type[THERMAL_NAME_LENGTH];
 204         struct device device;
 205         struct thermal_attr *trip_temp_attrs;
 206         struct thermal_attr *trip_type_attrs;
 207         struct thermal_attr *trip_hyst_attrs;
 208         void *devdata;
 209         int trips;
 210         int passive_delay;
 211         int polling_delay;
 212         int temperature;
 213         int last_temperature;
 214         int emul_temperature;
 215         int passive;
 216         unsigned int forced_passive;
 217         struct thermal_zone_device_ops *ops;
 218         const struct thermal_zone_params *tzp;
 219         struct thermal_governor *governor;
 220         struct list_head thermal_instances;
 221         struct idr idr;
 222         struct mutex lock;
 223         struct list_head node;
 224         struct delayed_work poll_queue;
 225 };
 226
 227 /**
 228  * struct thermal_governor - structure that holds thermal governor information
 229  * @name:       name of the governor
 230  * @throttle:   callback called for every trip point even if temperature is
 231  *              below the trip point temperature
 232  * @governor_list:      node in thermal_governor_list (in thermal_core.c)
 233  */
 234 struct thermal_governor {
 235         char name[THERMAL_NAME_LENGTH];
 236         int (*throttle)(struct thermal_zone_device *tz, int trip);
 237         struct list_head        governor_list;
 238 };
 239
 240 /* Structure that holds binding parameters for a zone */
 241 struct thermal_bind_params {
 242         struct thermal_cooling_device *cdev;
 243
 244         /*
 245          * This is a measure of 'how effectively these devices can
 246          * cool 'this' thermal zone. The shall be determined by platform
 247          * characterization. This is on a 'percentage' scale.
 248          * See Documentation/thermal/sysfs-api.txt for more information.
 249          */
 250         int weight;
 251
 252         /*
 253          * This is a bit mask that gives the binding relation between this
 254          * thermal zone and cdev, for a particular trip point.
 255          * See Documentation/thermal/sysfs-api.txt for more information.
 256          */
 257         int trip_mask;
 258
 259         /*
 260          * This is an array of cooling state limits. Must have exactly
 261          * 2 * thermal_zone.number_of_trip_points. It is an array consisting
 262          * of tuples <lower-state upper-state> of state limits. Each trip
 263          * will be associated with one state limit tuple when binding.
 264          * A NULL pointer means <THERMAL_NO_LIMITS THERMAL_NO_LIMITS>
 265          * on all trips.
 266          */
 267         unsigned long *binding_limits;
 268         int (*match) (struct thermal_zone_device *tz,
 269                         struct thermal_cooling_device *cdev);
 270 };
 271
 272 /* Structure to define Thermal Zone parameters */
 273 struct thermal_zone_params {
 274         char governor_name[THERMAL_NAME_LENGTH];
 275
 276         /*
 277          * a boolean to indicate if the thermal to hwmon sysfs interface
 278          * is required. when no_hwmon == false, a hwmon sysfs interface
 279          * will be created. when no_hwmon == true, nothing will be done
 280          */
 281         bool no_hwmon;
 282
 283         int num_tbps;   /* Number of tbp entries */
 284         struct thermal_bind_params *tbp;
 285 };
 286
 287 struct thermal_genl_event {
 288         u32 orig;
 289         enum events event;
 290 };
 291
 292 /* Function declarations */
 293 #ifdef CONFIG_THERMAL_OF
 294 struct thermal_zone_device *
 295 thermal_zone_of_sensor_register(struct device *dev, int id,
 296                                 void *data, int (*get_temp)(void *, long *),
 297                                 int (*get_trend)(void *, long *));
 298 void thermal_zone_of_sensor_unregister(struct device *dev,
 299                                        struct thermal_zone_device *tz);
 300 #else
 301 static inline struct thermal_zone_device *
 302 thermal_zone_of_sensor_register(struct device *dev, int id,
 303                                 void *data, int (*get_temp)(void *, long *),
 304                                 int (*get_trend)(void *, long *))
 305 {
 306         return NULL;
 307 }
 308
 309 static inline
 310 void thermal_zone_of_sensor_unregister(struct device *dev,
 311                                        struct thermal_zone_device *tz)
 312 {
 313 }
 314
 315 #endif
 316 struct thermal_zone_device *thermal_zone_device_register(const char *, int, int,
 317                 void *, struct thermal_zone_device_ops *,
 318                 const struct thermal_zone_params *, int, int);
 319 void thermal_zone_device_unregister(struct thermal_zone_device *);
 320
 321 int thermal_zone_bind_cooling_device(struct thermal_zone_device *, int,
 322                                      struct thermal_cooling_device *,
 323                                      unsigned long, unsigned long);
 324 int thermal_zone_unbind_cooling_device(struct thermal_zone_device *, int,
 325                                        struct thermal_cooling_device *);
 326 void thermal_zone_device_update(struct thermal_zone_device *);
 327
 328 struct thermal_cooling_device *thermal_cooling_device_register(char *, void *,
 329                 const struct thermal_cooling_device_ops *);
 330 struct thermal_cooling_device *
 331 thermal_of_cooling_device_register(struct device_node *np, char *, void *,
 332                                    const struct thermal_cooling_device_ops *);
 333 void thermal_cooling_device_unregister(struct thermal_cooling_device *);
 334 struct thermal_zone_device *thermal_zone_get_zone_by_name(const char *name);
 335 int thermal_zone_get_temp(struct thermal_zone_device *tz, unsigned long *temp);
 336
 337 int get_tz_trend(struct thermal_zone_device *, int);
 338 struct thermal_instance *get_thermal_instance(struct thermal_zone_device *,
 339                 struct thermal_cooling_device *, int);
 340 void thermal_cdev_update(struct thermal_cooling_device *);
 341 void thermal_notify_framework(struct thermal_zone_device *, int);
 342
 343 #ifdef CONFIG_NET
 344 extern int thermal_generate_netlink_event(struct thermal_zone_device *tz,
 345                                                 enum events event);
 346 #else
 347 static inline int thermal_generate_netlink_event(struct thermal_zone_device *tz,
 348                                                 enum events event)
 349 {
 350         return 0;
 351 }
 352 #endif
 353
 354 #endif /* __THERMAL_H__ */