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