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 	bool initialized;
45 	unsigned long upper;	/* Highest cooling state for this trip point */
46 	unsigned long lower;	/* Lowest cooling state for this trip point */
47 	unsigned long target;	/* expected cooling state */
48 	char attr_name[THERMAL_NAME_LENGTH];
49 	struct device_attribute attr;
50 	char weight_attr_name[THERMAL_NAME_LENGTH];
51 	struct device_attribute weight_attr;
52 	struct list_head tz_node; /* node in tz->thermal_instances */
53 	struct list_head cdev_node; /* node in cdev->thermal_instances */
54 	unsigned int weight; /* The weight of the cooling device */
55 };
56 
57 int thermal_register_governor(struct thermal_governor *);
58 void thermal_unregister_governor(struct thermal_governor *);
59 
60 #ifdef CONFIG_THERMAL_GOV_STEP_WISE
61 int thermal_gov_step_wise_register(void);
62 void thermal_gov_step_wise_unregister(void);
63 #else
64 static inline int thermal_gov_step_wise_register(void) { return 0; }
65 static inline void thermal_gov_step_wise_unregister(void) {}
66 #endif /* CONFIG_THERMAL_GOV_STEP_WISE */
67 
68 #ifdef CONFIG_THERMAL_GOV_FAIR_SHARE
69 int thermal_gov_fair_share_register(void);
70 void thermal_gov_fair_share_unregister(void);
71 #else
72 static inline int thermal_gov_fair_share_register(void) { return 0; }
73 static inline void thermal_gov_fair_share_unregister(void) {}
74 #endif /* CONFIG_THERMAL_GOV_FAIR_SHARE */
75 
76 #ifdef CONFIG_THERMAL_GOV_BANG_BANG
77 int thermal_gov_bang_bang_register(void);
78 void thermal_gov_bang_bang_unregister(void);
79 #else
80 static inline int thermal_gov_bang_bang_register(void) { return 0; }
81 static inline void thermal_gov_bang_bang_unregister(void) {}
82 #endif /* CONFIG_THERMAL_GOV_BANG_BANG */
83 
84 #ifdef CONFIG_THERMAL_GOV_USER_SPACE
85 int thermal_gov_user_space_register(void);
86 void thermal_gov_user_space_unregister(void);
87 #else
88 static inline int thermal_gov_user_space_register(void) { return 0; }
89 static inline void thermal_gov_user_space_unregister(void) {}
90 #endif /* CONFIG_THERMAL_GOV_USER_SPACE */
91 
92 #ifdef CONFIG_THERMAL_GOV_POWER_ALLOCATOR
93 int thermal_gov_power_allocator_register(void);
94 void thermal_gov_power_allocator_unregister(void);
95 #else
96 static inline int thermal_gov_power_allocator_register(void) { return 0; }
97 static inline void thermal_gov_power_allocator_unregister(void) {}
98 #endif /* CONFIG_THERMAL_GOV_POWER_ALLOCATOR */
99 
100 /* device tree support */
101 #ifdef CONFIG_THERMAL_OF
102 int of_parse_thermal_zones(void);
103 void of_thermal_destroy_zones(void);
104 int of_thermal_get_ntrips(struct thermal_zone_device *);
105 bool of_thermal_is_trip_valid(struct thermal_zone_device *, int);
106 const struct thermal_trip *
107 of_thermal_get_trip_points(struct thermal_zone_device *);
108 #else
109 static inline int of_parse_thermal_zones(void) { return 0; }
110 static inline void of_thermal_destroy_zones(void) { }
111 static inline int of_thermal_get_ntrips(struct thermal_zone_device *tz)
112 {
113 	return 0;
114 }
115 static inline bool of_thermal_is_trip_valid(struct thermal_zone_device *tz,
116 					    int trip)
117 {
118 	return false;
119 }
120 static inline const struct thermal_trip *
121 of_thermal_get_trip_points(struct thermal_zone_device *tz)
122 {
123 	return NULL;
124 }
125 #endif
126 
127 #endif /* __THERMAL_CORE_H__ */
128