summaryrefslogtreecommitdiff
path: root/include/linux/thermal.h
blob: 5a3b428daaab4a6fc68a45a77c62134630b82dc8 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
/*
 *  thermal.h  ($Revision: 0 $)
 *
 *  Copyright (C) 2008  Intel Corp
 *  Copyright (C) 2008  Zhang Rui <rui.zhang@intel.com>
 *  Copyright (C) 2008  Sujith Thomas <sujith.thomas@intel.com>
 *
 * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
 *  This program is free software; you can redistribute it and/or modify
 *  it under the terms of the GNU General Public License as published by
 *  the Free Software Foundation; version 2 of the License.
 *
 *  This program is distributed in the hope that it will be useful, but
 *  WITHOUT ANY WARRANTY; without even the implied warranty of
 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 *  General Public License for more details.
 *
 *  You should have received a copy of the GNU General Public License along
 *  with this program; if not, write to the Free Software Foundation, Inc.,
 *  59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
 *
 * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
 */

#ifndef __THERMAL_H__
#define __THERMAL_H__

#include <linux/idr.h>
#include <linux/device.h>
#include <linux/workqueue.h>

#define THERMAL_TRIPS_NONE	-1
#define THERMAL_MAX_TRIPS	12
#define THERMAL_NAME_LENGTH	20

/* invalid cooling state */
#define THERMAL_CSTATE_INVALID -1UL

/* No upper/lower limit requirement */
#define THERMAL_NO_LIMIT	THERMAL_CSTATE_INVALID

/* Unit conversion macros */
#define KELVIN_TO_CELSIUS(t)	(long)(((long)t-2732 >= 0) ?	\
				((long)t-2732+5)/10 : ((long)t-2732-5)/10)
#define CELSIUS_TO_KELVIN(t)	((t)*10+2732)

/* Adding event notification support elements */
#define THERMAL_GENL_FAMILY_NAME                "thermal_event"
#define THERMAL_GENL_VERSION                    0x01
#define THERMAL_GENL_MCAST_GROUP_NAME           "thermal_mc_group"

/* Default Thermal Governor */
#if defined(CONFIG_THERMAL_DEFAULT_GOV_STEP_WISE)
#define DEFAULT_THERMAL_GOVERNOR       "step_wise"
#elif defined(CONFIG_THERMAL_DEFAULT_GOV_FAIR_SHARE)
#define DEFAULT_THERMAL_GOVERNOR       "fair_share"
#elif defined(CONFIG_THERMAL_DEFAULT_GOV_USER_SPACE)
#define DEFAULT_THERMAL_GOVERNOR       "user_space"
#endif

struct thermal_zone_device;
struct thermal_cooling_device;

enum thermal_device_mode {
	THERMAL_DEVICE_DISABLED = 0,
	THERMAL_DEVICE_ENABLED,
};

enum thermal_trip_type {
	THERMAL_TRIP_ACTIVE = 0,
	THERMAL_TRIP_PASSIVE,
	THERMAL_TRIP_HOT,
	THERMAL_TRIP_CRITICAL,
};

enum thermal_trend {
	THERMAL_TREND_STABLE, /* temperature is stable */
	THERMAL_TREND_RAISING, /* temperature is raising */
	THERMAL_TREND_DROPPING, /* temperature is dropping */
	THERMAL_TREND_RAISE_FULL, /* apply highest cooling action */
	THERMAL_TREND_DROP_FULL, /* apply lowest cooling action */
};

/* Events supported by Thermal Netlink */
enum events {
	THERMAL_AUX0,
	THERMAL_AUX1,
	THERMAL_CRITICAL,
	THERMAL_DEV_FAULT,
};

/* attributes of thermal_genl_family */
enum {
	THERMAL_GENL_ATTR_UNSPEC,
	THERMAL_GENL_ATTR_EVENT,
	__THERMAL_GENL_ATTR_MAX,
};
#define THERMAL_GENL_ATTR_MAX (__THERMAL_GENL_ATTR_MAX - 1)

/* commands supported by the thermal_genl_family */
enum {
	THERMAL_GENL_CMD_UNSPEC,
	THERMAL_GENL_CMD_EVENT,
	__THERMAL_GENL_CMD_MAX,
};
#define THERMAL_GENL_CMD_MAX (__THERMAL_GENL_CMD_MAX - 1)

struct thermal_zone_device_ops {
	int (*bind) (struct thermal_zone_device *,
		     struct thermal_cooling_device *);
	int (*unbind) (struct thermal_zone_device *,
		       struct thermal_cooling_device *);
	int (*get_temp) (struct thermal_zone_device *, unsigned long *);
	int (*get_mode) (struct thermal_zone_device *,
			 enum thermal_device_mode *);
	int (*set_mode) (struct thermal_zone_device *,
		enum thermal_device_mode);
	int (*get_trip_type) (struct thermal_zone_device *, int,
		enum thermal_trip_type *);
	int (*get_trip_temp) (struct thermal_zone_device *, int,
			      unsigned long *);
	int (*set_trip_temp) (struct thermal_zone_device *, int,
			      unsigned long);
	int (*get_trip_hyst) (struct thermal_zone_device *, int,
			      unsigned long *);
	int (*set_trip_hyst) (struct thermal_zone_device *, int,
			      unsigned long);
	int (*get_crit_temp) (struct thermal_zone_device *, unsigned long *);
	int (*set_emul_temp) (struct thermal_zone_device *, unsigned long);
	int (*get_trend) (struct thermal_zone_device *, int,
			  enum thermal_trend *);
	int (*notify) (struct thermal_zone_device *, int,
		       enum thermal_trip_type);
};

struct thermal_cooling_device_ops {
	int (*get_max_state) (struct thermal_cooling_device *, unsigned long *);
	int (*get_cur_state) (struct thermal_cooling_device *, unsigned long *);
	int (*set_cur_state) (struct thermal_cooling_device *, unsigned long);
};

struct thermal_cooling_device {
	int id;
	char type[THERMAL_NAME_LENGTH];
	struct device device;
	void *devdata;
	const struct thermal_cooling_device_ops *ops;
	bool updated; /* true if the cooling device does not need update */
	struct mutex lock; /* protect thermal_instances list */
	struct list_head thermal_instances;
	struct list_head node;
};

struct thermal_attr {
	struct device_attribute attr;
	char name[THERMAL_NAME_LENGTH];
};

struct thermal_zone_device {
	int id;
	char type[THERMAL_NAME_LENGTH];
	struct device device;
	struct thermal_attr *trip_temp_attrs;
	struct thermal_attr *trip_type_attrs;
	struct thermal_attr *trip_hyst_attrs;
	void *devdata;
	int trips;
	int passive_delay;
	int polling_delay;
	int temperature;
	int last_temperature;
	int emul_temperature;
	int passive;
	unsigned int forced_passive;
	const struct thermal_zone_device_ops *ops;
	const struct thermal_zone_params *tzp;
	struct thermal_governor *governor;
	struct list_head thermal_instances;
	struct idr idr;
	struct mutex lock; /* protect thermal_instances list */
	struct list_head node;
	struct delayed_work poll_queue;
};

/* Structure that holds thermal governor information */
struct thermal_governor {
	char name[THERMAL_NAME_LENGTH];
	int (*throttle)(struct thermal_zone_device *tz, int trip);
	struct list_head	governor_list;
	struct module		*owner;
};

/* Structure that holds binding parameters for a zone */
struct thermal_bind_params {
	struct thermal_cooling_device *cdev;

	/*
	 * This is a measure of 'how effectively these devices can
	 * cool 'this' thermal zone. The shall be determined by platform
	 * characterization. This is on a 'percentage' scale.
	 * See Documentation/thermal/sysfs-api.txt for more information.
	 */
	int weight;

	/*
	 * This is a bit mask that gives the binding relation between this
	 * thermal zone and cdev, for a particular trip point.
	 * See Documentation/thermal/sysfs-api.txt for more information.
	 */
	int trip_mask;
	int (*match) (struct thermal_zone_device *tz,
			struct thermal_cooling_device *cdev);
};

/* Structure to define Thermal Zone parameters */
struct thermal_zone_params {
	char governor_name[THERMAL_NAME_LENGTH];
	int num_tbps;	/* Number of tbp entries */
	struct thermal_bind_params *tbp;
};

struct thermal_genl_event {
	u32 orig;
	enum events event;
};

/* Function declarations */
struct thermal_zone_device *thermal_zone_device_register(const char *, int, int,
		void *, const struct thermal_zone_device_ops *,
		const struct thermal_zone_params *, int, int);
void thermal_zone_device_unregister(struct thermal_zone_device *);

int thermal_zone_bind_cooling_device(struct thermal_zone_device *, int,
				     struct thermal_cooling_device *,
				     unsigned long, unsigned long);
int thermal_zone_unbind_cooling_device(struct thermal_zone_device *, int,
				       struct thermal_cooling_device *);
void thermal_zone_device_update(struct thermal_zone_device *);

struct thermal_cooling_device *thermal_cooling_device_register(char *, void *,
		const struct thermal_cooling_device_ops *);
void thermal_cooling_device_unregister(struct thermal_cooling_device *);

int get_tz_trend(struct thermal_zone_device *, int);
struct thermal_instance *get_thermal_instance(struct thermal_zone_device *,
		struct thermal_cooling_device *, int);
void thermal_cdev_update(struct thermal_cooling_device *);
void notify_thermal_framework(struct thermal_zone_device *, int);

int thermal_register_governor(struct thermal_governor *);
void thermal_unregister_governor(struct thermal_governor *);

#ifdef CONFIG_NET
extern int thermal_generate_netlink_event(struct thermal_zone_device *tz,
						enum events event);
#else
static int thermal_generate_netlink_event(struct thermal_zone_device *tz,
						enum events event)
{
	return 0;
}
#endif

#endif /* __THERMAL_H__ */