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
  31 struct thermal_zone_device;
  32 struct thermal_cooling_device;
  33
  34 struct thermal_zone_device_ops {
  35         int (*bind) (struct thermal_zone_device *,
  36                      struct thermal_cooling_device *);
  37         int (*unbind) (struct thermal_zone_device *,
  38                        struct thermal_cooling_device *);
  39         int (*get_temp) (struct thermal_zone_device *, char *);
  40         int (*get_mode) (struct thermal_zone_device *, char *);
  41         int (*set_mode) (struct thermal_zone_device *, const char *);
  42         int (*get_trip_type) (struct thermal_zone_device *, int, char *);
  43         int (*get_trip_temp) (struct thermal_zone_device *, int, char *);
  44         int (*get_crit_temp) (struct thermal_zone_device *, unsigned long *);
  45 };
  46
  47 struct thermal_cooling_device_ops {
  48         int (*get_max_state) (struct thermal_cooling_device *, char *);
  49         int (*get_cur_state) (struct thermal_cooling_device *, char *);
  50         int (*set_cur_state) (struct thermal_cooling_device *, unsigned int);
  51 };
  52
  53 #define THERMAL_TRIPS_NONE -1
  54 #define THERMAL_MAX_TRIPS 12
  55 #define THERMAL_NAME_LENGTH 20
  56 struct thermal_cooling_device {
  57         int id;
  58         char type[THERMAL_NAME_LENGTH];
  59         struct device device;
  60         void *devdata;
  61         struct thermal_cooling_device_ops *ops;
  62         struct list_head node;
  63 };
  64
  65 #define KELVIN_TO_CELSIUS(t)    (long)(((long)t-2732 >= 0) ?    \
  66                                 ((long)t-2732+5)/10 : ((long)t-2732-5)/10)
  67 #define CELSIUS_TO_KELVIN(t)    ((t)*10+2732)
  68
  69 #if defined(CONFIG_THERMAL_HWMON)
  70 /* thermal zone devices with the same type share one hwmon device */
  71 struct thermal_hwmon_device {
  72         char type[THERMAL_NAME_LENGTH];
  73         struct device *device;
  74         int count;
  75         struct list_head tz_list;
  76         struct list_head node;
  77 };
  78
  79 struct thermal_hwmon_attr {
  80         struct device_attribute attr;
  81         char name[16];
  82 };
  83 #endif
  84
  85 struct thermal_zone_device {
  86         int id;
  87         char type[THERMAL_NAME_LENGTH];
  88         struct device device;
  89         void *devdata;
  90         int trips;
  91         struct thermal_zone_device_ops *ops;
  92         struct list_head cooling_devices;
  93         struct idr idr;
  94         struct mutex lock;      /* protect cooling devices list */
  95         struct list_head node;
  96 #if defined(CONFIG_THERMAL_HWMON)
  97         struct list_head hwmon_node;
  98         struct thermal_hwmon_device *hwmon;
  99         struct thermal_hwmon_attr temp_input;   /* hwmon sys attr */
 100         struct thermal_hwmon_attr temp_crit;    /* hwmon sys attr */
 101 #endif
 102 };
 103
 104 struct thermal_zone_device *thermal_zone_device_register(char *, int, void *,
 105                                                          struct
 106                                                          thermal_zone_device_ops
 107                                                          *);
 108 void thermal_zone_device_unregister(struct thermal_zone_device *);
 109
 110 int thermal_zone_bind_cooling_device(struct thermal_zone_device *, int,
 111                                      struct thermal_cooling_device *);
 112 int thermal_zone_unbind_cooling_device(struct thermal_zone_device *, int,
 113                                        struct thermal_cooling_device *);
 114 struct thermal_cooling_device *thermal_cooling_device_register(char *, void *,
 115                                                                struct
 116                                                                thermal_cooling_device_ops
 117                                                                *);
 118 void thermal_cooling_device_unregister(struct thermal_cooling_device *);
 119
 120 #endif /* __THERMAL_H__ */