drivers/thermal/thermal_core.h

   1 /*
   2  *  thermal_core.h
   3  *
   4  *  Copyright (C) 2012  Intel Corp
   5  *  Author: Durgadoss R <durgadoss.r@intel.com>
   6  *
   7  * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
   8  *  This program is free software; you can redistribute it and/or modify
   9  *  it under the terms of the GNU General Public License as published by
  10  *  the Free Software Foundation; version 2 of the License.
  11  *
  12  *  This program is distributed in the hope that it will be useful, but
  13  *  WITHOUT ANY WARRANTY; without even the implied warranty of
  14  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  15  *  General Public License for more details.
  16  *
  17  *  You should have received a copy of the GNU General Public License along
  18  *  with this program; if not, write to the Free Software Foundation, Inc.,
  19  *  59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
  20  *
  21  * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
  22  */
  23
  24 #ifndef __THERMAL_CORE_H__
  25 #define __THERMAL_CORE_H__
  26
  27 #include <linux/device.h>
  28 #include <linux/thermal.h>
  29
  30 /* Initial state of a cooling device during binding */
  31 #define THERMAL_NO_TARGET -1UL
  32
  33 /*
  34  * This structure is used to describe the behavior of
  35  * a certain cooling device on a certain trip point
  36  * in a certain thermal zone
  37  */
  38 struct thermal_instance {
  39         int id;
  40         char name[THERMAL_NAME_LENGTH];
  41         struct thermal_zone_device *tz;
  42         struct thermal_cooling_device *cdev;
  43         int trip;
  44         unsigned long upper;    /* Highest cooling state for this trip point */
  45         unsigned long lower;    /* Lowest cooling state for this trip point */
  46         unsigned long target;   /* expected cooling state */
  47         char attr_name[THERMAL_NAME_LENGTH];
  48         struct device_attribute attr;
  49         char weight_attr_name[THERMAL_NAME_LENGTH];
  50         struct device_attribute weight_attr;
  51         struct list_head tz_node; /* node in tz->thermal_instances */
  52         struct list_head cdev_node; /* node in cdev->thermal_instances */
  53         unsigned int weight; /* The weight of the cooling device */
  54 };
  55
  56 int thermal_register_governor(struct thermal_governor *);
  57 void thermal_unregister_governor(struct thermal_governor *);
  58
  59 #ifdef CONFIG_THERMAL_GOV_STEP_WISE
  60 int thermal_gov_step_wise_register(void);
  61 void thermal_gov_step_wise_unregister(void);
  62 #else
  63 static inline int thermal_gov_step_wise_register(void) { return 0; }
  64 static inline void thermal_gov_step_wise_unregister(void) {}
  65 #endif /* CONFIG_THERMAL_GOV_STEP_WISE */
  66
  67 #ifdef CONFIG_THERMAL_GOV_FAIR_SHARE
  68 int thermal_gov_fair_share_register(void);
  69 void thermal_gov_fair_share_unregister(void);
  70 #else
  71 static inline int thermal_gov_fair_share_register(void) { return 0; }
  72 static inline void thermal_gov_fair_share_unregister(void) {}
  73 #endif /* CONFIG_THERMAL_GOV_FAIR_SHARE */
  74
  75 #ifdef CONFIG_THERMAL_GOV_BANG_BANG
  76 int thermal_gov_bang_bang_register(void);
  77 void thermal_gov_bang_bang_unregister(void);
  78 #else
  79 static inline int thermal_gov_bang_bang_register(void) { return 0; }
  80 static inline void thermal_gov_bang_bang_unregister(void) {}
  81 #endif /* CONFIG_THERMAL_GOV_BANG_BANG */
  82
  83 #ifdef CONFIG_THERMAL_GOV_USER_SPACE
  84 int thermal_gov_user_space_register(void);
  85 void thermal_gov_user_space_unregister(void);
  86 #else
  87 static inline int thermal_gov_user_space_register(void) { return 0; }
  88 static inline void thermal_gov_user_space_unregister(void) {}
  89 #endif /* CONFIG_THERMAL_GOV_USER_SPACE */
  90
  91 /* device tree support */
  92 #ifdef CONFIG_THERMAL_OF
  93 int of_parse_thermal_zones(void);
  94 void of_thermal_destroy_zones(void);
  95 int of_thermal_get_ntrips(struct thermal_zone_device *);
  96 bool of_thermal_is_trip_valid(struct thermal_zone_device *, int);
  97 const struct thermal_trip *
  98 of_thermal_get_trip_points(struct thermal_zone_device *);
  99 #else
 100 static inline int of_parse_thermal_zones(void) { return 0; }
 101 static inline void of_thermal_destroy_zones(void) { }
 102 static inline int of_thermal_get_ntrips(struct thermal_zone_device *tz)
 103 {
 104         return 0;
 105 }
 106 static inline bool of_thermal_is_trip_valid(struct thermal_zone_device *tz,
 107                                             int trip)
 108 {
 109         return 0;
 110 }
 111 static inline const struct thermal_trip *
 112 of_thermal_get_trip_points(struct thermal_zone_device *tz)
 113 {
 114         return NULL;
 115 }
 116 #endif
 117
 118 #endif /* __THERMAL_CORE_H__ */