2 * thermal.h ($Revision: 0 $)
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>
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.
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.
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.
22 * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
28 #include <linux/idr.h>
29 #include <linux/device.h>
30 #include <linux/workqueue.h>
32 #define THERMAL_TRIPS_NONE -1
33 #define THERMAL_MAX_TRIPS 12
34 #define THERMAL_NAME_LENGTH 20
36 /* No upper/lower limit requirement */
37 #define THERMAL_NO_LIMIT -1UL
39 /* Unit conversion macros */
40 #define KELVIN_TO_CELSIUS(t) (long)(((long)t-2732 >= 0) ? \
41 ((long)t-2732+5)/10 : ((long)t-2732-5)/10)
42 #define CELSIUS_TO_KELVIN(t) ((t)*10+2732)
44 /* Adding event notification support elements */
45 #define THERMAL_GENL_FAMILY_NAME "thermal_event"
46 #define THERMAL_GENL_VERSION 0x01
47 #define THERMAL_GENL_MCAST_GROUP_NAME "thermal_mc_group"
49 /* Default Thermal Governor */
50 #if defined(CONFIG_THERMAL_DEFAULT_GOV_STEP_WISE)
51 #define DEFAULT_THERMAL_GOVERNOR "step_wise"
52 #elif defined(CONFIG_THERMAL_DEFAULT_GOV_FAIR_SHARE)
53 #define DEFAULT_THERMAL_GOVERNOR "fair_share"
54 #elif defined(CONFIG_THERMAL_DEFAULT_GOV_USER_SPACE)
55 #define DEFAULT_THERMAL_GOVERNOR "user_space"
58 struct thermal_zone_device
;
59 struct thermal_cooling_device
;
61 enum thermal_device_mode
{
62 THERMAL_DEVICE_DISABLED
= 0,
63 THERMAL_DEVICE_ENABLED
,
66 enum thermal_trip_type
{
67 THERMAL_TRIP_ACTIVE
= 0,
70 THERMAL_TRIP_CRITICAL
,
74 THERMAL_TREND_STABLE
, /* temperature is stable */
75 THERMAL_TREND_RAISING
, /* temperature is raising */
76 THERMAL_TREND_DROPPING
, /* temperature is dropping */
77 THERMAL_TREND_RAISE_FULL
, /* apply highest cooling action */
78 THERMAL_TREND_DROP_FULL
, /* apply lowest cooling action */
81 /* Events supported by Thermal Netlink */
89 /* attributes of thermal_genl_family */
91 THERMAL_GENL_ATTR_UNSPEC
,
92 THERMAL_GENL_ATTR_EVENT
,
93 __THERMAL_GENL_ATTR_MAX
,
95 #define THERMAL_GENL_ATTR_MAX (__THERMAL_GENL_ATTR_MAX - 1)
97 /* commands supported by the thermal_genl_family */
99 THERMAL_GENL_CMD_UNSPEC
,
100 THERMAL_GENL_CMD_EVENT
,
101 __THERMAL_GENL_CMD_MAX
,
103 #define THERMAL_GENL_CMD_MAX (__THERMAL_GENL_CMD_MAX - 1)
105 struct thermal_zone_device_ops
{
106 int (*bind
) (struct thermal_zone_device
*,
107 struct thermal_cooling_device
*);
108 int (*unbind
) (struct thermal_zone_device
*,
109 struct thermal_cooling_device
*);
110 int (*get_temp
) (struct thermal_zone_device
*, unsigned long *);
111 int (*get_mode
) (struct thermal_zone_device
*,
112 enum thermal_device_mode
*);
113 int (*set_mode
) (struct thermal_zone_device
*,
114 enum thermal_device_mode
);
115 int (*get_trip_type
) (struct thermal_zone_device
*, int,
116 enum thermal_trip_type
*);
117 int (*get_trip_temp
) (struct thermal_zone_device
*, int,
119 int (*set_trip_temp
) (struct thermal_zone_device
*, int,
121 int (*get_trip_hyst
) (struct thermal_zone_device
*, int,
123 int (*set_trip_hyst
) (struct thermal_zone_device
*, int,
125 int (*get_crit_temp
) (struct thermal_zone_device
*, unsigned long *);
126 int (*set_emul_temp
) (struct thermal_zone_device
*, unsigned long);
127 int (*get_trend
) (struct thermal_zone_device
*, int,
128 enum thermal_trend
*);
129 int (*notify
) (struct thermal_zone_device
*, int,
130 enum thermal_trip_type
);
133 struct thermal_cooling_device_ops
{
134 int (*get_max_state
) (struct thermal_cooling_device
*, unsigned long *);
135 int (*get_cur_state
) (struct thermal_cooling_device
*, unsigned long *);
136 int (*set_cur_state
) (struct thermal_cooling_device
*, unsigned long);
139 struct thermal_cooling_device
{
141 char type
[THERMAL_NAME_LENGTH
];
142 struct device device
;
144 const struct thermal_cooling_device_ops
*ops
;
145 bool updated
; /* true if the cooling device does not need update */
146 struct mutex lock
; /* protect thermal_instances list */
147 struct list_head thermal_instances
;
148 struct list_head node
;
151 struct thermal_attr
{
152 struct device_attribute attr
;
153 char name
[THERMAL_NAME_LENGTH
];
156 struct thermal_zone_device
{
158 char type
[THERMAL_NAME_LENGTH
];
159 struct device device
;
160 struct thermal_attr
*trip_temp_attrs
;
161 struct thermal_attr
*trip_type_attrs
;
162 struct thermal_attr
*trip_hyst_attrs
;
168 int last_temperature
;
169 int emul_temperature
;
171 unsigned int forced_passive
;
172 const struct thermal_zone_device_ops
*ops
;
173 const struct thermal_zone_params
*tzp
;
174 struct thermal_governor
*governor
;
175 struct list_head thermal_instances
;
177 struct mutex lock
; /* protect thermal_instances list */
178 struct list_head node
;
179 struct delayed_work poll_queue
;
182 /* Structure that holds thermal governor information */
183 struct thermal_governor
{
184 char name
[THERMAL_NAME_LENGTH
];
185 int (*throttle
)(struct thermal_zone_device
*tz
, int trip
);
186 struct list_head governor_list
;
187 struct module
*owner
;
190 /* Structure that holds binding parameters for a zone */
191 struct thermal_bind_params
{
192 struct thermal_cooling_device
*cdev
;
195 * This is a measure of 'how effectively these devices can
196 * cool 'this' thermal zone. The shall be determined by platform
197 * characterization. This is on a 'percentage' scale.
198 * See Documentation/thermal/sysfs-api.txt for more information.
203 * This is a bit mask that gives the binding relation between this
204 * thermal zone and cdev, for a particular trip point.
205 * See Documentation/thermal/sysfs-api.txt for more information.
208 int (*match
) (struct thermal_zone_device
*tz
,
209 struct thermal_cooling_device
*cdev
);
212 /* Structure to define Thermal Zone parameters */
213 struct thermal_zone_params
{
214 char governor_name
[THERMAL_NAME_LENGTH
];
215 int num_tbps
; /* Number of tbp entries */
216 struct thermal_bind_params
*tbp
;
219 struct thermal_genl_event
{
224 /* Function declarations */
225 struct thermal_zone_device
*thermal_zone_device_register(const char *, int, int,
226 void *, const struct thermal_zone_device_ops
*,
227 const struct thermal_zone_params
*, int, int);
228 void thermal_zone_device_unregister(struct thermal_zone_device
*);
230 int thermal_zone_bind_cooling_device(struct thermal_zone_device
*, int,
231 struct thermal_cooling_device
*,
232 unsigned long, unsigned long);
233 int thermal_zone_unbind_cooling_device(struct thermal_zone_device
*, int,
234 struct thermal_cooling_device
*);
235 void thermal_zone_device_update(struct thermal_zone_device
*);
237 struct thermal_cooling_device
*thermal_cooling_device_register(char *, void *,
238 const struct thermal_cooling_device_ops
*);
239 void thermal_cooling_device_unregister(struct thermal_cooling_device
*);
241 int get_tz_trend(struct thermal_zone_device
*, int);
242 struct thermal_instance
*get_thermal_instance(struct thermal_zone_device
*,
243 struct thermal_cooling_device
*, int);
244 void thermal_cdev_update(struct thermal_cooling_device
*);
245 void notify_thermal_framework(struct thermal_zone_device
*, int);
247 int thermal_register_governor(struct thermal_governor
*);
248 void thermal_unregister_governor(struct thermal_governor
*);
251 extern int thermal_generate_netlink_event(struct thermal_zone_device
*tz
,
254 static int thermal_generate_netlink_event(struct thermal_zone_device
*tz
,
261 #endif /* __THERMAL_H__ */