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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#include <linux/workqueue.h>
31
32#define THERMAL_TRIPS_NONE -1
33#define THERMAL_MAX_TRIPS 12
34#define THERMAL_NAME_LENGTH 20
35
36/* invalid cooling state */
37#define THERMAL_CSTATE_INVALID -1UL
38
39/* No upper/lower limit requirement */
40#define THERMAL_NO_LIMIT THERMAL_CSTATE_INVALID
41
42/* Unit conversion macros */
43#define KELVIN_TO_CELSIUS(t) (long)(((long)t-2732 >= 0) ? \
44 ((long)t-2732+5)/10 : ((long)t-2732-5)/10)
45#define CELSIUS_TO_KELVIN(t) ((t)*10+2732)
46
47/* Adding event notification support elements */
48#define THERMAL_GENL_FAMILY_NAME "thermal_event"
49#define THERMAL_GENL_VERSION 0x01
50#define THERMAL_GENL_MCAST_GROUP_NAME "thermal_mc_grp"
51
52/* Default Thermal Governor */
53#if defined(CONFIG_THERMAL_DEFAULT_GOV_STEP_WISE)
54#define DEFAULT_THERMAL_GOVERNOR "step_wise"
55#elif defined(CONFIG_THERMAL_DEFAULT_GOV_FAIR_SHARE)
56#define DEFAULT_THERMAL_GOVERNOR "fair_share"
57#elif defined(CONFIG_THERMAL_DEFAULT_GOV_USER_SPACE)
58#define DEFAULT_THERMAL_GOVERNOR "user_space"
59#endif
60
61struct thermal_zone_device;
62struct thermal_cooling_device;
63
64enum thermal_device_mode {
65 THERMAL_DEVICE_DISABLED = 0,
66 THERMAL_DEVICE_ENABLED,
67};
68
69enum thermal_trip_type {
70 THERMAL_TRIP_ACTIVE = 0,
71 THERMAL_TRIP_PASSIVE,
72 THERMAL_TRIP_HOT,
73 THERMAL_TRIP_CRITICAL,
74};
75
76enum thermal_trend {
77 THERMAL_TREND_STABLE, /* temperature is stable */
78 THERMAL_TREND_RAISING, /* temperature is raising */
79 THERMAL_TREND_DROPPING, /* temperature is dropping */
80 THERMAL_TREND_RAISE_FULL, /* apply highest cooling action */
81 THERMAL_TREND_DROP_FULL, /* apply lowest cooling action */
82};
83
84/* Events supported by Thermal Netlink */
85enum events {
86 THERMAL_AUX0,
87 THERMAL_AUX1,
88 THERMAL_CRITICAL,
89 THERMAL_DEV_FAULT,
90};
91
92/* attributes of thermal_genl_family */
93enum {
94 THERMAL_GENL_ATTR_UNSPEC,
95 THERMAL_GENL_ATTR_EVENT,
96 __THERMAL_GENL_ATTR_MAX,
97};
98#define THERMAL_GENL_ATTR_MAX (__THERMAL_GENL_ATTR_MAX - 1)
99
100/* commands supported by the thermal_genl_family */
101enum {
102 THERMAL_GENL_CMD_UNSPEC,
103 THERMAL_GENL_CMD_EVENT,
104 __THERMAL_GENL_CMD_MAX,
105};
106#define THERMAL_GENL_CMD_MAX (__THERMAL_GENL_CMD_MAX - 1)
107
108struct thermal_zone_device_ops {
109 int (*bind) (struct thermal_zone_device *,
110 struct thermal_cooling_device *);
111 int (*unbind) (struct thermal_zone_device *,
112 struct thermal_cooling_device *);
113 int (*get_temp) (struct thermal_zone_device *, unsigned long *);
114 int (*get_mode) (struct thermal_zone_device *,
115 enum thermal_device_mode *);
116 int (*set_mode) (struct thermal_zone_device *,
117 enum thermal_device_mode);
118 int (*get_trip_type) (struct thermal_zone_device *, int,
119 enum thermal_trip_type *);
120 int (*get_trip_temp) (struct thermal_zone_device *, int,
121 unsigned long *);
122 int (*set_trip_temp) (struct thermal_zone_device *, int,
123 unsigned long);
124 int (*get_trip_hyst) (struct thermal_zone_device *, int,
125 unsigned long *);
126 int (*set_trip_hyst) (struct thermal_zone_device *, int,
127 unsigned long);
128 int (*get_crit_temp) (struct thermal_zone_device *, unsigned long *);
129 int (*set_emul_temp) (struct thermal_zone_device *, unsigned long);
130 int (*get_trend) (struct thermal_zone_device *, int,
131 enum thermal_trend *);
132 int (*notify) (struct thermal_zone_device *, int,
133 enum thermal_trip_type);
134};
135
136struct thermal_cooling_device_ops {
137 int (*get_max_state) (struct thermal_cooling_device *, unsigned long *);
138 int (*get_cur_state) (struct thermal_cooling_device *, unsigned long *);
139 int (*set_cur_state) (struct thermal_cooling_device *, unsigned long);
140};
141
142struct thermal_cooling_device {
143 int id;
144 char type[THERMAL_NAME_LENGTH];
145 struct device device;
146 void *devdata;
147 const struct thermal_cooling_device_ops *ops;
148 bool updated; /* true if the cooling device does not need update */
149 struct mutex lock; /* protect thermal_instances list */
150 struct list_head thermal_instances;
151 struct list_head node;
152};
153
154struct thermal_attr {
155 struct device_attribute attr;
156 char name[THERMAL_NAME_LENGTH];
157};
158
159struct thermal_zone_device {
160 int id;
161 char type[THERMAL_NAME_LENGTH];
162 struct device device;
163 struct thermal_attr *trip_temp_attrs;
164 struct thermal_attr *trip_type_attrs;
165 struct thermal_attr *trip_hyst_attrs;
166 void *devdata;
167 int trips;
168 int passive_delay;
169 int polling_delay;
170 int temperature;
171 int last_temperature;
172 int emul_temperature;
173 int passive;
174 unsigned int forced_passive;
175 const struct thermal_zone_device_ops *ops;
176 const struct thermal_zone_params *tzp;
177 struct thermal_governor *governor;
178 struct list_head thermal_instances;
179 struct idr idr;
180 struct mutex lock; /* protect thermal_instances list */
181 struct list_head node;
182 struct delayed_work poll_queue;
183};
184
185/* Structure that holds thermal governor information */
186struct thermal_governor {
187 char name[THERMAL_NAME_LENGTH];
188 int (*throttle)(struct thermal_zone_device *tz, int trip);
189 struct list_head governor_list;
190};
191
192/* Structure that holds binding parameters for a zone */
193struct thermal_bind_params {
194 struct thermal_cooling_device *cdev;
195
196 /*
197 * This is a measure of 'how effectively these devices can
198 * cool 'this' thermal zone. The shall be determined by platform
199 * characterization. This is on a 'percentage' scale.
200 * See Documentation/thermal/sysfs-api.txt for more information.
201 */
202 int weight;
203
204 /*
205 * This is a bit mask that gives the binding relation between this
206 * thermal zone and cdev, for a particular trip point.
207 * See Documentation/thermal/sysfs-api.txt for more information.
208 */
209 int trip_mask;
210
211 /*
212 * This is an array of cooling state limits. Must have exactly
213 * 2 * thermal_zone.number_of_trip_points. It is an array consisting
214 * of tuples <lower-state upper-state> of state limits. Each trip
215 * will be associated with one state limit tuple when binding.
216 * A NULL pointer means <THERMAL_NO_LIMITS THERMAL_NO_LIMITS>
217 * on all trips.
218 */
219 unsigned long *binding_limits;
220 int (*match) (struct thermal_zone_device *tz,
221 struct thermal_cooling_device *cdev);
222};
223
224/* Structure to define Thermal Zone parameters */
225struct thermal_zone_params {
226 char governor_name[THERMAL_NAME_LENGTH];
227
228 /*
229 * a boolean to indicate if the thermal to hwmon sysfs interface
230 * is required. when no_hwmon == false, a hwmon sysfs interface
231 * will be created. when no_hwmon == true, nothing will be done
232 */
233 bool no_hwmon;
234
235 int num_tbps; /* Number of tbp entries */
236 struct thermal_bind_params *tbp;
237};
238
239struct thermal_genl_event {
240 u32 orig;
241 enum events event;
242};
243
244/* Function declarations */
245struct thermal_zone_device *thermal_zone_device_register(const char *, int, int,
246 void *, const struct thermal_zone_device_ops *,
247 const struct thermal_zone_params *, int, int);
248void thermal_zone_device_unregister(struct thermal_zone_device *);
249
250int thermal_zone_bind_cooling_device(struct thermal_zone_device *, int,
251 struct thermal_cooling_device *,
252 unsigned long, unsigned long);
253int thermal_zone_unbind_cooling_device(struct thermal_zone_device *, int,
254 struct thermal_cooling_device *);
255void thermal_zone_device_update(struct thermal_zone_device *);
256
257struct thermal_cooling_device *thermal_cooling_device_register(char *, void *,
258 const struct thermal_cooling_device_ops *);
259void thermal_cooling_device_unregister(struct thermal_cooling_device *);
260struct thermal_zone_device *thermal_zone_get_zone_by_name(const char *name);
261int thermal_zone_get_temp(struct thermal_zone_device *tz, unsigned long *temp);
262
263int get_tz_trend(struct thermal_zone_device *, int);
264struct thermal_instance *get_thermal_instance(struct thermal_zone_device *,
265 struct thermal_cooling_device *, int);
266void thermal_cdev_update(struct thermal_cooling_device *);
267void thermal_notify_framework(struct thermal_zone_device *, int);
268
269#ifdef CONFIG_NET
270extern int thermal_generate_netlink_event(struct thermal_zone_device *tz,
271 enum events event);
272#else
273static inline int thermal_generate_netlink_event(struct thermal_zone_device *tz,
274 enum events event)
275{
276 return 0;
277}
278#endif
279
280#endif /* __THERMAL_H__ */