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Commit | Line | Data |
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203d3d4a ZR |
1 | /* |
2 | * thermal.c - Generic Thermal Management Sysfs support. | |
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 | * | |
203d3d4a ZR |
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. | |
203d3d4a ZR |
11 | */ |
12 | ||
c5a01dd5 JP |
13 | #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt |
14 | ||
203d3d4a ZR |
15 | #include <linux/module.h> |
16 | #include <linux/device.h> | |
17 | #include <linux/err.h> | |
5a0e3ad6 | 18 | #include <linux/slab.h> |
203d3d4a ZR |
19 | #include <linux/kdev_t.h> |
20 | #include <linux/idr.h> | |
21 | #include <linux/thermal.h> | |
b1569e99 | 22 | #include <linux/reboot.h> |
42a5bf50 | 23 | #include <linux/string.h> |
a116b5d4 | 24 | #include <linux/of.h> |
4cb18728 D |
25 | #include <net/netlink.h> |
26 | #include <net/genetlink.h> | |
ff140fea | 27 | #include <linux/suspend.h> |
203d3d4a | 28 | |
100a8fdb PA |
29 | #define CREATE_TRACE_POINTS |
30 | #include <trace/events/thermal.h> | |
31 | ||
71350db4 | 32 | #include "thermal_core.h" |
0dd88793 | 33 | #include "thermal_hwmon.h" |
71350db4 | 34 | |
63c4ec90 | 35 | MODULE_AUTHOR("Zhang Rui"); |
203d3d4a | 36 | MODULE_DESCRIPTION("Generic thermal management sysfs support"); |
6d8d4974 | 37 | MODULE_LICENSE("GPL v2"); |
203d3d4a | 38 | |
b31ef828 MW |
39 | static DEFINE_IDA(thermal_tz_ida); |
40 | static DEFINE_IDA(thermal_cdev_ida); | |
203d3d4a ZR |
41 | |
42 | static LIST_HEAD(thermal_tz_list); | |
43 | static LIST_HEAD(thermal_cdev_list); | |
a4a15485 D |
44 | static LIST_HEAD(thermal_governor_list); |
45 | ||
203d3d4a | 46 | static DEFINE_MUTEX(thermal_list_lock); |
a4a15485 | 47 | static DEFINE_MUTEX(thermal_governor_lock); |
e441fd68 | 48 | static DEFINE_MUTEX(poweroff_lock); |
a4a15485 | 49 | |
ff140fea | 50 | static atomic_t in_suspend; |
e441fd68 | 51 | static bool power_off_triggered; |
ff140fea | 52 | |
f2234bcd ZR |
53 | static struct thermal_governor *def_governor; |
54 | ||
1b4f4849 EV |
55 | /* |
56 | * Governor section: set of functions to handle thermal governors | |
57 | * | |
58 | * Functions to help in the life cycle of thermal governors within | |
59 | * the thermal core and by the thermal governor code. | |
60 | */ | |
61 | ||
a4a15485 D |
62 | static struct thermal_governor *__find_governor(const char *name) |
63 | { | |
64 | struct thermal_governor *pos; | |
65 | ||
f2234bcd ZR |
66 | if (!name || !name[0]) |
67 | return def_governor; | |
68 | ||
a4a15485 | 69 | list_for_each_entry(pos, &thermal_governor_list, governor_list) |
484ac2f3 | 70 | if (!strncasecmp(name, pos->name, THERMAL_NAME_LENGTH)) |
a4a15485 D |
71 | return pos; |
72 | ||
73 | return NULL; | |
74 | } | |
75 | ||
e33df1d2 JM |
76 | /** |
77 | * bind_previous_governor() - bind the previous governor of the thermal zone | |
78 | * @tz: a valid pointer to a struct thermal_zone_device | |
79 | * @failed_gov_name: the name of the governor that failed to register | |
80 | * | |
81 | * Register the previous governor of the thermal zone after a new | |
82 | * governor has failed to be bound. | |
83 | */ | |
84 | static void bind_previous_governor(struct thermal_zone_device *tz, | |
85 | const char *failed_gov_name) | |
86 | { | |
87 | if (tz->governor && tz->governor->bind_to_tz) { | |
88 | if (tz->governor->bind_to_tz(tz)) { | |
89 | dev_err(&tz->device, | |
90 | "governor %s failed to bind and the previous one (%s) failed to bind again, thermal zone %s has no governor\n", | |
91 | failed_gov_name, tz->governor->name, tz->type); | |
92 | tz->governor = NULL; | |
93 | } | |
94 | } | |
95 | } | |
96 | ||
97 | /** | |
98 | * thermal_set_governor() - Switch to another governor | |
99 | * @tz: a valid pointer to a struct thermal_zone_device | |
100 | * @new_gov: pointer to the new governor | |
101 | * | |
102 | * Change the governor of thermal zone @tz. | |
103 | * | |
104 | * Return: 0 on success, an error if the new governor's bind_to_tz() failed. | |
105 | */ | |
106 | static int thermal_set_governor(struct thermal_zone_device *tz, | |
107 | struct thermal_governor *new_gov) | |
108 | { | |
109 | int ret = 0; | |
110 | ||
111 | if (tz->governor && tz->governor->unbind_from_tz) | |
112 | tz->governor->unbind_from_tz(tz); | |
113 | ||
114 | if (new_gov && new_gov->bind_to_tz) { | |
115 | ret = new_gov->bind_to_tz(tz); | |
116 | if (ret) { | |
117 | bind_previous_governor(tz, new_gov->name); | |
118 | ||
119 | return ret; | |
120 | } | |
121 | } | |
122 | ||
123 | tz->governor = new_gov; | |
124 | ||
125 | return ret; | |
126 | } | |
127 | ||
a4a15485 D |
128 | int thermal_register_governor(struct thermal_governor *governor) |
129 | { | |
130 | int err; | |
131 | const char *name; | |
132 | struct thermal_zone_device *pos; | |
133 | ||
134 | if (!governor) | |
135 | return -EINVAL; | |
136 | ||
137 | mutex_lock(&thermal_governor_lock); | |
138 | ||
139 | err = -EBUSY; | |
5027ba36 | 140 | if (!__find_governor(governor->name)) { |
eb7be329 EV |
141 | bool match_default; |
142 | ||
a4a15485 D |
143 | err = 0; |
144 | list_add(&governor->governor_list, &thermal_governor_list); | |
eb7be329 EV |
145 | match_default = !strncmp(governor->name, |
146 | DEFAULT_THERMAL_GOVERNOR, | |
147 | THERMAL_NAME_LENGTH); | |
148 | ||
149 | if (!def_governor && match_default) | |
f2234bcd | 150 | def_governor = governor; |
a4a15485 D |
151 | } |
152 | ||
153 | mutex_lock(&thermal_list_lock); | |
154 | ||
155 | list_for_each_entry(pos, &thermal_tz_list, node) { | |
f2234bcd ZR |
156 | /* |
157 | * only thermal zones with specified tz->tzp->governor_name | |
158 | * may run with tz->govenor unset | |
159 | */ | |
a4a15485 D |
160 | if (pos->governor) |
161 | continue; | |
f2234bcd ZR |
162 | |
163 | name = pos->tzp->governor_name; | |
164 | ||
e33df1d2 JM |
165 | if (!strncasecmp(name, governor->name, THERMAL_NAME_LENGTH)) { |
166 | int ret; | |
167 | ||
168 | ret = thermal_set_governor(pos, governor); | |
169 | if (ret) | |
170 | dev_err(&pos->device, | |
171 | "Failed to set governor %s for thermal zone %s: %d\n", | |
172 | governor->name, pos->type, ret); | |
173 | } | |
a4a15485 D |
174 | } |
175 | ||
176 | mutex_unlock(&thermal_list_lock); | |
177 | mutex_unlock(&thermal_governor_lock); | |
178 | ||
179 | return err; | |
180 | } | |
a4a15485 D |
181 | |
182 | void thermal_unregister_governor(struct thermal_governor *governor) | |
183 | { | |
184 | struct thermal_zone_device *pos; | |
185 | ||
186 | if (!governor) | |
187 | return; | |
188 | ||
189 | mutex_lock(&thermal_governor_lock); | |
190 | ||
5027ba36 | 191 | if (!__find_governor(governor->name)) |
a4a15485 D |
192 | goto exit; |
193 | ||
194 | mutex_lock(&thermal_list_lock); | |
195 | ||
196 | list_for_each_entry(pos, &thermal_tz_list, node) { | |
484ac2f3 | 197 | if (!strncasecmp(pos->governor->name, governor->name, |
eb7be329 | 198 | THERMAL_NAME_LENGTH)) |
e33df1d2 | 199 | thermal_set_governor(pos, NULL); |
a4a15485 D |
200 | } |
201 | ||
202 | mutex_unlock(&thermal_list_lock); | |
203 | list_del(&governor->governor_list); | |
204 | exit: | |
205 | mutex_unlock(&thermal_governor_lock); | |
9b4298a0 | 206 | } |
9b4298a0 | 207 | |
1b4f4849 EV |
208 | int thermal_zone_device_set_policy(struct thermal_zone_device *tz, |
209 | char *policy) | |
9b4298a0 | 210 | { |
1b4f4849 EV |
211 | struct thermal_governor *gov; |
212 | int ret = -EINVAL; | |
9b4298a0 | 213 | |
1b4f4849 | 214 | mutex_lock(&thermal_governor_lock); |
9b4298a0 | 215 | mutex_lock(&tz->lock); |
9b4298a0 | 216 | |
1b4f4849 EV |
217 | gov = __find_governor(strim(policy)); |
218 | if (!gov) | |
219 | goto exit; | |
9b4298a0 | 220 | |
1b4f4849 | 221 | ret = thermal_set_governor(tz, gov); |
9b4298a0 | 222 | |
1b4f4849 EV |
223 | exit: |
224 | mutex_unlock(&tz->lock); | |
225 | mutex_unlock(&thermal_governor_lock); | |
9b4298a0 | 226 | |
1b4f4849 | 227 | return ret; |
7e8ee1e9 D |
228 | } |
229 | ||
1b4f4849 | 230 | int thermal_build_list_of_policies(char *buf) |
7e8ee1e9 | 231 | { |
1b4f4849 EV |
232 | struct thermal_governor *pos; |
233 | ssize_t count = 0; | |
234 | ssize_t size = PAGE_SIZE; | |
7e8ee1e9 | 235 | |
1b4f4849 | 236 | mutex_lock(&thermal_governor_lock); |
a8892d83 | 237 | |
1b4f4849 EV |
238 | list_for_each_entry(pos, &thermal_governor_list, governor_list) { |
239 | size = PAGE_SIZE - count; | |
240 | count += scnprintf(buf + count, size, "%s ", pos->name); | |
7e8ee1e9 | 241 | } |
1b4f4849 | 242 | count += scnprintf(buf + count, size, "\n"); |
7e8ee1e9 | 243 | |
1b4f4849 | 244 | mutex_unlock(&thermal_governor_lock); |
7e8ee1e9 | 245 | |
1b4f4849 | 246 | return count; |
7e8ee1e9 D |
247 | } |
248 | ||
1b4f4849 | 249 | static int __init thermal_register_governors(void) |
7e8ee1e9 | 250 | { |
1b4f4849 | 251 | int result; |
7e8ee1e9 | 252 | |
1b4f4849 EV |
253 | result = thermal_gov_step_wise_register(); |
254 | if (result) | |
255 | return result; | |
7e8ee1e9 | 256 | |
1b4f4849 EV |
257 | result = thermal_gov_fair_share_register(); |
258 | if (result) | |
259 | return result; | |
7e8ee1e9 | 260 | |
1b4f4849 EV |
261 | result = thermal_gov_bang_bang_register(); |
262 | if (result) | |
263 | return result; | |
7e8ee1e9 | 264 | |
1b4f4849 EV |
265 | result = thermal_gov_user_space_register(); |
266 | if (result) | |
267 | return result; | |
7e8ee1e9 | 268 | |
1b4f4849 | 269 | return thermal_gov_power_allocator_register(); |
7e8ee1e9 D |
270 | } |
271 | ||
1b4f4849 | 272 | static void thermal_unregister_governors(void) |
7e8ee1e9 | 273 | { |
1b4f4849 EV |
274 | thermal_gov_step_wise_unregister(); |
275 | thermal_gov_fair_share_unregister(); | |
276 | thermal_gov_bang_bang_unregister(); | |
277 | thermal_gov_user_space_unregister(); | |
278 | thermal_gov_power_allocator_unregister(); | |
7e8ee1e9 D |
279 | } |
280 | ||
8772e185 EV |
281 | /* |
282 | * Zone update section: main control loop applied to each zone while monitoring | |
283 | * | |
284 | * in polling mode. The monitoring is done using a workqueue. | |
285 | * Same update may be done on a zone by calling thermal_zone_device_update(). | |
286 | * | |
287 | * An update means: | |
288 | * - Non-critical trips will invoke the governor responsible for that zone; | |
289 | * - Hot trips will produce a notification to userspace; | |
290 | * - Critical trip point will cause a system shutdown. | |
291 | */ | |
0c01ebbf D |
292 | static void thermal_zone_device_set_polling(struct thermal_zone_device *tz, |
293 | int delay) | |
294 | { | |
295 | if (delay > 1000) | |
296 | mod_delayed_work(system_freezable_wq, &tz->poll_queue, | |
297 | round_jiffies(msecs_to_jiffies(delay))); | |
298 | else if (delay) | |
299 | mod_delayed_work(system_freezable_wq, &tz->poll_queue, | |
300 | msecs_to_jiffies(delay)); | |
301 | else | |
302 | cancel_delayed_work(&tz->poll_queue); | |
303 | } | |
304 | ||
305 | static void monitor_thermal_zone(struct thermal_zone_device *tz) | |
306 | { | |
307 | mutex_lock(&tz->lock); | |
308 | ||
309 | if (tz->passive) | |
310 | thermal_zone_device_set_polling(tz, tz->passive_delay); | |
311 | else if (tz->polling_delay) | |
312 | thermal_zone_device_set_polling(tz, tz->polling_delay); | |
313 | else | |
314 | thermal_zone_device_set_polling(tz, 0); | |
315 | ||
316 | mutex_unlock(&tz->lock); | |
317 | } | |
318 | ||
319 | static void handle_non_critical_trips(struct thermal_zone_device *tz, | |
eb7be329 EV |
320 | int trip, |
321 | enum thermal_trip_type trip_type) | |
0c01ebbf | 322 | { |
f2234bcd ZR |
323 | tz->governor ? tz->governor->throttle(tz, trip) : |
324 | def_governor->throttle(tz, trip); | |
0c01ebbf D |
325 | } |
326 | ||
ef1d87e0 K |
327 | /** |
328 | * thermal_emergency_poweroff_func - emergency poweroff work after a known delay | |
329 | * @work: work_struct associated with the emergency poweroff function | |
330 | * | |
331 | * This function is called in very critical situations to force | |
332 | * a kernel poweroff after a configurable timeout value. | |
333 | */ | |
334 | static void thermal_emergency_poweroff_func(struct work_struct *work) | |
335 | { | |
336 | /* | |
337 | * We have reached here after the emergency thermal shutdown | |
338 | * Waiting period has expired. This means orderly_poweroff has | |
339 | * not been able to shut off the system for some reason. | |
340 | * Try to shut down the system immediately using kernel_power_off | |
341 | * if populated | |
342 | */ | |
343 | WARN(1, "Attempting kernel_power_off: Temperature too high\n"); | |
344 | kernel_power_off(); | |
345 | ||
346 | /* | |
347 | * Worst of the worst case trigger emergency restart | |
348 | */ | |
349 | WARN(1, "Attempting emergency_restart: Temperature too high\n"); | |
350 | emergency_restart(); | |
351 | } | |
352 | ||
353 | static DECLARE_DELAYED_WORK(thermal_emergency_poweroff_work, | |
354 | thermal_emergency_poweroff_func); | |
355 | ||
356 | /** | |
357 | * thermal_emergency_poweroff - Trigger an emergency system poweroff | |
358 | * | |
359 | * This may be called from any critical situation to trigger a system shutdown | |
360 | * after a known period of time. By default this is not scheduled. | |
361 | */ | |
c4b379d0 | 362 | static void thermal_emergency_poweroff(void) |
ef1d87e0 K |
363 | { |
364 | int poweroff_delay_ms = CONFIG_THERMAL_EMERGENCY_POWEROFF_DELAY_MS; | |
365 | /* | |
366 | * poweroff_delay_ms must be a carefully profiled positive value. | |
367 | * Its a must for thermal_emergency_poweroff_work to be scheduled | |
368 | */ | |
369 | if (poweroff_delay_ms <= 0) | |
370 | return; | |
371 | schedule_delayed_work(&thermal_emergency_poweroff_work, | |
372 | msecs_to_jiffies(poweroff_delay_ms)); | |
373 | } | |
374 | ||
0c01ebbf | 375 | static void handle_critical_trips(struct thermal_zone_device *tz, |
eb7be329 | 376 | int trip, enum thermal_trip_type trip_type) |
0c01ebbf | 377 | { |
17e8351a | 378 | int trip_temp; |
0c01ebbf D |
379 | |
380 | tz->ops->get_trip_temp(tz, trip, &trip_temp); | |
381 | ||
382 | /* If we have not crossed the trip_temp, we do not care. */ | |
84ffe3ec | 383 | if (trip_temp <= 0 || tz->temperature < trip_temp) |
0c01ebbf D |
384 | return; |
385 | ||
208cd822 PA |
386 | trace_thermal_zone_trip(tz, trip, trip_type); |
387 | ||
0c01ebbf D |
388 | if (tz->ops->notify) |
389 | tz->ops->notify(tz, trip, trip_type); | |
390 | ||
391 | if (trip_type == THERMAL_TRIP_CRITICAL) { | |
923e0b1e | 392 | dev_emerg(&tz->device, |
039f6cf5 | 393 | "critical temperature reached (%d C), shutting down\n", |
923e0b1e | 394 | tz->temperature / 1000); |
e441fd68 K |
395 | mutex_lock(&poweroff_lock); |
396 | if (!power_off_triggered) { | |
ef1d87e0 K |
397 | /* |
398 | * Queue a backup emergency shutdown in the event of | |
399 | * orderly_poweroff failure | |
400 | */ | |
401 | thermal_emergency_poweroff(); | |
e441fd68 K |
402 | orderly_poweroff(true); |
403 | power_off_triggered = true; | |
404 | } | |
405 | mutex_unlock(&poweroff_lock); | |
0c01ebbf D |
406 | } |
407 | } | |
408 | ||
409 | static void handle_thermal_trip(struct thermal_zone_device *tz, int trip) | |
410 | { | |
411 | enum thermal_trip_type type; | |
412 | ||
81ad4276 ZR |
413 | /* Ignore disabled trip points */ |
414 | if (test_bit(trip, &tz->trips_disabled)) | |
415 | return; | |
416 | ||
0c01ebbf D |
417 | tz->ops->get_trip_type(tz, trip, &type); |
418 | ||
419 | if (type == THERMAL_TRIP_CRITICAL || type == THERMAL_TRIP_HOT) | |
420 | handle_critical_trips(tz, trip, type); | |
421 | else | |
422 | handle_non_critical_trips(tz, trip, type); | |
423 | /* | |
424 | * Alright, we handled this trip successfully. | |
425 | * So, start monitoring again. | |
426 | */ | |
427 | monitor_thermal_zone(tz); | |
428 | } | |
429 | ||
430 | static void update_temperature(struct thermal_zone_device *tz) | |
431 | { | |
17e8351a | 432 | int temp, ret; |
0c01ebbf | 433 | |
e6e238c3 | 434 | ret = thermal_zone_get_temp(tz, &temp); |
0c01ebbf | 435 | if (ret) { |
7e497a73 HG |
436 | if (ret != -EAGAIN) |
437 | dev_warn(&tz->device, | |
438 | "failed to read out thermal zone (%d)\n", | |
439 | ret); | |
e6e238c3 | 440 | return; |
0c01ebbf D |
441 | } |
442 | ||
e6e238c3 | 443 | mutex_lock(&tz->lock); |
0c01ebbf D |
444 | tz->last_temperature = tz->temperature; |
445 | tz->temperature = temp; | |
0c01ebbf | 446 | mutex_unlock(&tz->lock); |
06475b55 | 447 | |
100a8fdb | 448 | trace_thermal_temperature(tz); |
bb431ba2 ZR |
449 | if (tz->last_temperature == THERMAL_TEMP_INVALID) |
450 | dev_dbg(&tz->device, "last_temperature N/A, current_temperature=%d\n", | |
451 | tz->temperature); | |
452 | else | |
453 | dev_dbg(&tz->device, "last_temperature=%d, current_temperature=%d\n", | |
454 | tz->last_temperature, tz->temperature); | |
455 | } | |
456 | ||
457 | static void thermal_zone_device_reset(struct thermal_zone_device *tz) | |
458 | { | |
459 | struct thermal_instance *pos; | |
460 | ||
461 | tz->temperature = THERMAL_TEMP_INVALID; | |
462 | tz->passive = 0; | |
463 | list_for_each_entry(pos, &tz->thermal_instances, tz_node) | |
464 | pos->initialized = false; | |
0c01ebbf D |
465 | } |
466 | ||
0e70f466 SP |
467 | void thermal_zone_device_update(struct thermal_zone_device *tz, |
468 | enum thermal_notify_event event) | |
0c01ebbf D |
469 | { |
470 | int count; | |
471 | ||
ff140fea ZR |
472 | if (atomic_read(&in_suspend)) |
473 | return; | |
474 | ||
81bd4e1c EV |
475 | if (!tz->ops->get_temp) |
476 | return; | |
477 | ||
0c01ebbf D |
478 | update_temperature(tz); |
479 | ||
060c034a SH |
480 | thermal_zone_set_trips(tz); |
481 | ||
0e70f466 SP |
482 | tz->notify_event = event; |
483 | ||
0c01ebbf D |
484 | for (count = 0; count < tz->trips; count++) |
485 | handle_thermal_trip(tz, count); | |
486 | } | |
910cb1e3 | 487 | EXPORT_SYMBOL_GPL(thermal_zone_device_update); |
0c01ebbf | 488 | |
106339ab EV |
489 | /** |
490 | * thermal_notify_framework - Sensor drivers use this API to notify framework | |
491 | * @tz: thermal zone device | |
492 | * @trip: indicates which trip point has been crossed | |
493 | * | |
494 | * This function handles the trip events from sensor drivers. It starts | |
495 | * throttling the cooling devices according to the policy configured. | |
496 | * For CRITICAL and HOT trip points, this notifies the respective drivers, | |
497 | * and does actual throttling for other trip points i.e ACTIVE and PASSIVE. | |
498 | * The throttling policy is based on the configured platform data; if no | |
499 | * platform data is provided, this uses the step_wise throttling policy. | |
500 | */ | |
501 | void thermal_notify_framework(struct thermal_zone_device *tz, int trip) | |
502 | { | |
503 | handle_thermal_trip(tz, trip); | |
504 | } | |
505 | EXPORT_SYMBOL_GPL(thermal_notify_framework); | |
506 | ||
0c01ebbf D |
507 | static void thermal_zone_device_check(struct work_struct *work) |
508 | { | |
509 | struct thermal_zone_device *tz = container_of(work, struct | |
510 | thermal_zone_device, | |
511 | poll_queue.work); | |
0e70f466 | 512 | thermal_zone_device_update(tz, THERMAL_EVENT_UNSPECIFIED); |
0c01ebbf D |
513 | } |
514 | ||
712afbdf EV |
515 | /* |
516 | * Power actor section: interface to power actors to estimate power | |
517 | * | |
518 | * Set of functions used to interact to cooling devices that know | |
519 | * how to estimate their devices power consumption. | |
520 | */ | |
9f38271c | 521 | |
35b11d2e JM |
522 | /** |
523 | * power_actor_get_max_power() - get the maximum power that a cdev can consume | |
524 | * @cdev: pointer to &thermal_cooling_device | |
525 | * @tz: a valid thermal zone device pointer | |
526 | * @max_power: pointer in which to store the maximum power | |
527 | * | |
528 | * Calculate the maximum power consumption in milliwats that the | |
529 | * cooling device can currently consume and store it in @max_power. | |
530 | * | |
531 | * Return: 0 on success, -EINVAL if @cdev doesn't support the | |
532 | * power_actor API or -E* on other error. | |
533 | */ | |
534 | int power_actor_get_max_power(struct thermal_cooling_device *cdev, | |
535 | struct thermal_zone_device *tz, u32 *max_power) | |
536 | { | |
537 | if (!cdev_is_power_actor(cdev)) | |
538 | return -EINVAL; | |
539 | ||
540 | return cdev->ops->state2power(cdev, tz, 0, max_power); | |
541 | } | |
542 | ||
c973c3bc JM |
543 | /** |
544 | * power_actor_get_min_power() - get the mainimum power that a cdev can consume | |
545 | * @cdev: pointer to &thermal_cooling_device | |
546 | * @tz: a valid thermal zone device pointer | |
547 | * @min_power: pointer in which to store the minimum power | |
548 | * | |
549 | * Calculate the minimum power consumption in milliwatts that the | |
550 | * cooling device can currently consume and store it in @min_power. | |
551 | * | |
552 | * Return: 0 on success, -EINVAL if @cdev doesn't support the | |
553 | * power_actor API or -E* on other error. | |
554 | */ | |
555 | int power_actor_get_min_power(struct thermal_cooling_device *cdev, | |
556 | struct thermal_zone_device *tz, u32 *min_power) | |
557 | { | |
558 | unsigned long max_state; | |
559 | int ret; | |
560 | ||
561 | if (!cdev_is_power_actor(cdev)) | |
562 | return -EINVAL; | |
563 | ||
564 | ret = cdev->ops->get_max_state(cdev, &max_state); | |
565 | if (ret) | |
566 | return ret; | |
567 | ||
568 | return cdev->ops->state2power(cdev, tz, max_state, min_power); | |
569 | } | |
570 | ||
35b11d2e | 571 | /** |
1a7e7cc0 | 572 | * power_actor_set_power() - limit the maximum power a cooling device consumes |
35b11d2e JM |
573 | * @cdev: pointer to &thermal_cooling_device |
574 | * @instance: thermal instance to update | |
575 | * @power: the power in milliwatts | |
576 | * | |
1a7e7cc0 EV |
577 | * Set the cooling device to consume at most @power milliwatts. The limit is |
578 | * expected to be a cap at the maximum power consumption. | |
35b11d2e JM |
579 | * |
580 | * Return: 0 on success, -EINVAL if the cooling device does not | |
581 | * implement the power actor API or -E* for other failures. | |
582 | */ | |
583 | int power_actor_set_power(struct thermal_cooling_device *cdev, | |
584 | struct thermal_instance *instance, u32 power) | |
585 | { | |
586 | unsigned long state; | |
587 | int ret; | |
588 | ||
589 | if (!cdev_is_power_actor(cdev)) | |
590 | return -EINVAL; | |
591 | ||
592 | ret = cdev->ops->power2state(cdev, instance->tz, power, &state); | |
593 | if (ret) | |
594 | return ret; | |
595 | ||
596 | instance->target = state; | |
d0b7306d | 597 | mutex_lock(&cdev->lock); |
35b11d2e | 598 | cdev->updated = false; |
d0b7306d | 599 | mutex_unlock(&cdev->lock); |
35b11d2e JM |
600 | thermal_cdev_update(cdev); |
601 | ||
602 | return 0; | |
603 | } | |
604 | ||
3d0055d2 EV |
605 | void thermal_zone_device_rebind_exception(struct thermal_zone_device *tz, |
606 | const char *cdev_type, size_t size) | |
203d3d4a | 607 | { |
3d0055d2 | 608 | struct thermal_cooling_device *cdev = NULL; |
203d3d4a | 609 | |
3d0055d2 EV |
610 | mutex_lock(&thermal_list_lock); |
611 | list_for_each_entry(cdev, &thermal_cdev_list, node) { | |
612 | /* skip non matching cdevs */ | |
613 | if (strncmp(cdev_type, cdev->type, size)) | |
614 | continue; | |
615 | ||
616 | /* re binding the exception matching the type pattern */ | |
617 | thermal_zone_bind_cooling_device(tz, THERMAL_TRIPS_NONE, cdev, | |
618 | THERMAL_NO_LIMIT, | |
619 | THERMAL_NO_LIMIT, | |
620 | THERMAL_WEIGHT_DEFAULT); | |
621 | } | |
622 | mutex_unlock(&thermal_list_lock); | |
203d3d4a ZR |
623 | } |
624 | ||
3d0055d2 EV |
625 | void thermal_zone_device_unbind_exception(struct thermal_zone_device *tz, |
626 | const char *cdev_type, size_t size) | |
203d3d4a | 627 | { |
3d0055d2 | 628 | struct thermal_cooling_device *cdev = NULL; |
203d3d4a | 629 | |
3d0055d2 EV |
630 | mutex_lock(&thermal_list_lock); |
631 | list_for_each_entry(cdev, &thermal_cdev_list, node) { | |
632 | /* skip non matching cdevs */ | |
633 | if (strncmp(cdev_type, cdev->type, size)) | |
634 | continue; | |
635 | /* unbinding the exception matching the type pattern */ | |
636 | thermal_zone_unbind_cooling_device(tz, THERMAL_TRIPS_NONE, | |
637 | cdev); | |
638 | } | |
639 | mutex_unlock(&thermal_list_lock); | |
203d3d4a ZR |
640 | } |
641 | ||
81193e2e EV |
642 | /* |
643 | * Device management section: cooling devices, zones devices, and binding | |
644 | * | |
645 | * Set of functions provided by the thermal core for: | |
646 | * - cooling devices lifecycle: registration, unregistration, | |
647 | * binding, and unbinding. | |
648 | * - thermal zone devices lifecycle: registration, unregistration, | |
649 | * binding, and unbinding. | |
650 | */ | |
203d3d4a ZR |
651 | |
652 | /** | |
d2e4eb83 EV |
653 | * thermal_zone_bind_cooling_device() - bind a cooling device to a thermal zone |
654 | * @tz: pointer to struct thermal_zone_device | |
203d3d4a ZR |
655 | * @trip: indicates which trip point the cooling devices is |
656 | * associated with in this thermal zone. | |
d2e4eb83 EV |
657 | * @cdev: pointer to struct thermal_cooling_device |
658 | * @upper: the Maximum cooling state for this trip point. | |
659 | * THERMAL_NO_LIMIT means no upper limit, | |
660 | * and the cooling device can be in max_state. | |
661 | * @lower: the Minimum cooling state can be used for this trip point. | |
662 | * THERMAL_NO_LIMIT means no lower limit, | |
663 | * and the cooling device can be in cooling state 0. | |
6cd9e9f6 KS |
664 | * @weight: The weight of the cooling device to be bound to the |
665 | * thermal zone. Use THERMAL_WEIGHT_DEFAULT for the | |
666 | * default value | |
543a9561 | 667 | * |
d2e4eb83 EV |
668 | * This interface function bind a thermal cooling device to the certain trip |
669 | * point of a thermal zone device. | |
543a9561 | 670 | * This function is usually called in the thermal zone device .bind callback. |
d2e4eb83 EV |
671 | * |
672 | * Return: 0 on success, the proper error value otherwise. | |
203d3d4a ZR |
673 | */ |
674 | int thermal_zone_bind_cooling_device(struct thermal_zone_device *tz, | |
675 | int trip, | |
9d99842f | 676 | struct thermal_cooling_device *cdev, |
6cd9e9f6 KS |
677 | unsigned long upper, unsigned long lower, |
678 | unsigned int weight) | |
203d3d4a | 679 | { |
b81b6ba3 ZR |
680 | struct thermal_instance *dev; |
681 | struct thermal_instance *pos; | |
c7516709 TS |
682 | struct thermal_zone_device *pos1; |
683 | struct thermal_cooling_device *pos2; | |
74051ba5 | 684 | unsigned long max_state; |
9a3031dc | 685 | int result, ret; |
203d3d4a | 686 | |
543a9561 | 687 | if (trip >= tz->trips || (trip < 0 && trip != THERMAL_TRIPS_NONE)) |
203d3d4a ZR |
688 | return -EINVAL; |
689 | ||
c7516709 TS |
690 | list_for_each_entry(pos1, &thermal_tz_list, node) { |
691 | if (pos1 == tz) | |
692 | break; | |
693 | } | |
694 | list_for_each_entry(pos2, &thermal_cdev_list, node) { | |
695 | if (pos2 == cdev) | |
696 | break; | |
697 | } | |
698 | ||
699 | if (tz != pos1 || cdev != pos2) | |
203d3d4a ZR |
700 | return -EINVAL; |
701 | ||
9a3031dc LM |
702 | ret = cdev->ops->get_max_state(cdev, &max_state); |
703 | if (ret) | |
704 | return ret; | |
9d99842f ZR |
705 | |
706 | /* lower default 0, upper default max_state */ | |
707 | lower = lower == THERMAL_NO_LIMIT ? 0 : lower; | |
708 | upper = upper == THERMAL_NO_LIMIT ? max_state : upper; | |
709 | ||
710 | if (lower > upper || upper > max_state) | |
711 | return -EINVAL; | |
712 | ||
95e3ed15 | 713 | dev = kzalloc(sizeof(*dev), GFP_KERNEL); |
203d3d4a ZR |
714 | if (!dev) |
715 | return -ENOMEM; | |
716 | dev->tz = tz; | |
717 | dev->cdev = cdev; | |
718 | dev->trip = trip; | |
9d99842f ZR |
719 | dev->upper = upper; |
720 | dev->lower = lower; | |
ce119f83 | 721 | dev->target = THERMAL_NO_TARGET; |
6cd9e9f6 | 722 | dev->weight = weight; |
74051ba5 | 723 | |
b31ef828 MW |
724 | result = ida_simple_get(&tz->ida, 0, 0, GFP_KERNEL); |
725 | if (result < 0) | |
203d3d4a ZR |
726 | goto free_mem; |
727 | ||
b31ef828 | 728 | dev->id = result; |
203d3d4a ZR |
729 | sprintf(dev->name, "cdev%d", dev->id); |
730 | result = | |
731 | sysfs_create_link(&tz->device.kobj, &cdev->device.kobj, dev->name); | |
732 | if (result) | |
b31ef828 | 733 | goto release_ida; |
203d3d4a ZR |
734 | |
735 | sprintf(dev->attr_name, "cdev%d_trip_point", dev->id); | |
975f8c56 | 736 | sysfs_attr_init(&dev->attr.attr); |
203d3d4a ZR |
737 | dev->attr.attr.name = dev->attr_name; |
738 | dev->attr.attr.mode = 0444; | |
739 | dev->attr.show = thermal_cooling_device_trip_point_show; | |
740 | result = device_create_file(&tz->device, &dev->attr); | |
741 | if (result) | |
742 | goto remove_symbol_link; | |
743 | ||
db916513 JM |
744 | sprintf(dev->weight_attr_name, "cdev%d_weight", dev->id); |
745 | sysfs_attr_init(&dev->weight_attr.attr); | |
746 | dev->weight_attr.attr.name = dev->weight_attr_name; | |
747 | dev->weight_attr.attr.mode = S_IWUSR | S_IRUGO; | |
748 | dev->weight_attr.show = thermal_cooling_device_weight_show; | |
749 | dev->weight_attr.store = thermal_cooling_device_weight_store; | |
750 | result = device_create_file(&tz->device, &dev->weight_attr); | |
751 | if (result) | |
752 | goto remove_trip_file; | |
753 | ||
203d3d4a | 754 | mutex_lock(&tz->lock); |
f4a821ce | 755 | mutex_lock(&cdev->lock); |
cddf31b3 | 756 | list_for_each_entry(pos, &tz->thermal_instances, tz_node) |
b659a30d EV |
757 | if (pos->tz == tz && pos->trip == trip && pos->cdev == cdev) { |
758 | result = -EEXIST; | |
759 | break; | |
760 | } | |
b5e4ae62 | 761 | if (!result) { |
cddf31b3 | 762 | list_add_tail(&dev->tz_node, &tz->thermal_instances); |
b5e4ae62 | 763 | list_add_tail(&dev->cdev_node, &cdev->thermal_instances); |
4511f716 | 764 | atomic_set(&tz->need_update, 1); |
b5e4ae62 | 765 | } |
f4a821ce | 766 | mutex_unlock(&cdev->lock); |
203d3d4a ZR |
767 | mutex_unlock(&tz->lock); |
768 | ||
769 | if (!result) | |
770 | return 0; | |
771 | ||
db916513 JM |
772 | device_remove_file(&tz->device, &dev->weight_attr); |
773 | remove_trip_file: | |
203d3d4a | 774 | device_remove_file(&tz->device, &dev->attr); |
caca8b80 | 775 | remove_symbol_link: |
203d3d4a | 776 | sysfs_remove_link(&tz->device.kobj, dev->name); |
b31ef828 MW |
777 | release_ida: |
778 | ida_simple_remove(&tz->ida, dev->id); | |
caca8b80 | 779 | free_mem: |
203d3d4a ZR |
780 | kfree(dev); |
781 | return result; | |
782 | } | |
910cb1e3 | 783 | EXPORT_SYMBOL_GPL(thermal_zone_bind_cooling_device); |
203d3d4a ZR |
784 | |
785 | /** | |
9892e5dc EV |
786 | * thermal_zone_unbind_cooling_device() - unbind a cooling device from a |
787 | * thermal zone. | |
788 | * @tz: pointer to a struct thermal_zone_device. | |
203d3d4a ZR |
789 | * @trip: indicates which trip point the cooling devices is |
790 | * associated with in this thermal zone. | |
9892e5dc | 791 | * @cdev: pointer to a struct thermal_cooling_device. |
543a9561 | 792 | * |
9892e5dc EV |
793 | * This interface function unbind a thermal cooling device from the certain |
794 | * trip point of a thermal zone device. | |
543a9561 | 795 | * This function is usually called in the thermal zone device .unbind callback. |
9892e5dc EV |
796 | * |
797 | * Return: 0 on success, the proper error value otherwise. | |
203d3d4a ZR |
798 | */ |
799 | int thermal_zone_unbind_cooling_device(struct thermal_zone_device *tz, | |
800 | int trip, | |
801 | struct thermal_cooling_device *cdev) | |
802 | { | |
b81b6ba3 | 803 | struct thermal_instance *pos, *next; |
203d3d4a ZR |
804 | |
805 | mutex_lock(&tz->lock); | |
f4a821ce | 806 | mutex_lock(&cdev->lock); |
cddf31b3 | 807 | list_for_each_entry_safe(pos, next, &tz->thermal_instances, tz_node) { |
543a9561 | 808 | if (pos->tz == tz && pos->trip == trip && pos->cdev == cdev) { |
cddf31b3 | 809 | list_del(&pos->tz_node); |
b5e4ae62 | 810 | list_del(&pos->cdev_node); |
f4a821ce | 811 | mutex_unlock(&cdev->lock); |
203d3d4a ZR |
812 | mutex_unlock(&tz->lock); |
813 | goto unbind; | |
814 | } | |
815 | } | |
f4a821ce | 816 | mutex_unlock(&cdev->lock); |
203d3d4a ZR |
817 | mutex_unlock(&tz->lock); |
818 | ||
819 | return -ENODEV; | |
820 | ||
caca8b80 | 821 | unbind: |
528464ea | 822 | device_remove_file(&tz->device, &pos->weight_attr); |
203d3d4a ZR |
823 | device_remove_file(&tz->device, &pos->attr); |
824 | sysfs_remove_link(&tz->device.kobj, pos->name); | |
b31ef828 | 825 | ida_simple_remove(&tz->ida, pos->id); |
203d3d4a ZR |
826 | kfree(pos); |
827 | return 0; | |
828 | } | |
910cb1e3 | 829 | EXPORT_SYMBOL_GPL(thermal_zone_unbind_cooling_device); |
203d3d4a ZR |
830 | |
831 | static void thermal_release(struct device *dev) | |
832 | { | |
833 | struct thermal_zone_device *tz; | |
834 | struct thermal_cooling_device *cdev; | |
835 | ||
caca8b80 JP |
836 | if (!strncmp(dev_name(dev), "thermal_zone", |
837 | sizeof("thermal_zone") - 1)) { | |
203d3d4a | 838 | tz = to_thermal_zone(dev); |
6a6cd25b | 839 | thermal_zone_destroy_device_groups(tz); |
203d3d4a | 840 | kfree(tz); |
b659a30d EV |
841 | } else if (!strncmp(dev_name(dev), "cooling_device", |
842 | sizeof("cooling_device") - 1)) { | |
203d3d4a ZR |
843 | cdev = to_cooling_device(dev); |
844 | kfree(cdev); | |
845 | } | |
846 | } | |
847 | ||
848 | static struct class thermal_class = { | |
849 | .name = "thermal", | |
850 | .dev_release = thermal_release, | |
851 | }; | |
852 | ||
4b0d3c2d EV |
853 | static inline |
854 | void print_bind_err_msg(struct thermal_zone_device *tz, | |
855 | struct thermal_cooling_device *cdev, int ret) | |
f502ab84 EV |
856 | { |
857 | dev_err(&tz->device, "binding zone %s with cdev %s failed:%d\n", | |
858 | tz->type, cdev->type, ret); | |
859 | } | |
860 | ||
861 | static void __bind(struct thermal_zone_device *tz, int mask, | |
862 | struct thermal_cooling_device *cdev, | |
863 | unsigned long *limits, | |
864 | unsigned int weight) | |
865 | { | |
866 | int i, ret; | |
867 | ||
868 | for (i = 0; i < tz->trips; i++) { | |
869 | if (mask & (1 << i)) { | |
870 | unsigned long upper, lower; | |
871 | ||
872 | upper = THERMAL_NO_LIMIT; | |
873 | lower = THERMAL_NO_LIMIT; | |
874 | if (limits) { | |
875 | lower = limits[i * 2]; | |
876 | upper = limits[i * 2 + 1]; | |
877 | } | |
878 | ret = thermal_zone_bind_cooling_device(tz, i, cdev, | |
879 | upper, lower, | |
880 | weight); | |
881 | if (ret) | |
882 | print_bind_err_msg(tz, cdev, ret); | |
883 | } | |
884 | } | |
885 | } | |
886 | ||
949aad83 EV |
887 | static void bind_cdev(struct thermal_cooling_device *cdev) |
888 | { | |
889 | int i, ret; | |
890 | const struct thermal_zone_params *tzp; | |
891 | struct thermal_zone_device *pos = NULL; | |
892 | ||
893 | mutex_lock(&thermal_list_lock); | |
894 | ||
895 | list_for_each_entry(pos, &thermal_tz_list, node) { | |
896 | if (!pos->tzp && !pos->ops->bind) | |
897 | continue; | |
898 | ||
899 | if (pos->ops->bind) { | |
900 | ret = pos->ops->bind(pos, cdev); | |
901 | if (ret) | |
902 | print_bind_err_msg(pos, cdev, ret); | |
903 | continue; | |
904 | } | |
905 | ||
906 | tzp = pos->tzp; | |
907 | if (!tzp || !tzp->tbp) | |
908 | continue; | |
909 | ||
910 | for (i = 0; i < tzp->num_tbps; i++) { | |
911 | if (tzp->tbp[i].cdev || !tzp->tbp[i].match) | |
912 | continue; | |
913 | if (tzp->tbp[i].match(pos, cdev)) | |
914 | continue; | |
915 | tzp->tbp[i].cdev = cdev; | |
916 | __bind(pos, tzp->tbp[i].trip_mask, cdev, | |
917 | tzp->tbp[i].binding_limits, | |
918 | tzp->tbp[i].weight); | |
919 | } | |
920 | } | |
921 | ||
922 | mutex_unlock(&thermal_list_lock); | |
923 | } | |
924 | ||
203d3d4a | 925 | /** |
a116b5d4 EV |
926 | * __thermal_cooling_device_register() - register a new thermal cooling device |
927 | * @np: a pointer to a device tree node. | |
203d3d4a ZR |
928 | * @type: the thermal cooling device type. |
929 | * @devdata: device private data. | |
930 | * @ops: standard thermal cooling devices callbacks. | |
3a6eccb3 EV |
931 | * |
932 | * This interface function adds a new thermal cooling device (fan/processor/...) | |
933 | * to /sys/class/thermal/ folder as cooling_device[0-*]. It tries to bind itself | |
934 | * to all the thermal zone devices registered at the same time. | |
a116b5d4 EV |
935 | * It also gives the opportunity to link the cooling device to a device tree |
936 | * node, so that it can be bound to a thermal zone created out of device tree. | |
3a6eccb3 EV |
937 | * |
938 | * Return: a pointer to the created struct thermal_cooling_device or an | |
939 | * ERR_PTR. Caller must check return value with IS_ERR*() helpers. | |
203d3d4a | 940 | */ |
a116b5d4 EV |
941 | static struct thermal_cooling_device * |
942 | __thermal_cooling_device_register(struct device_node *np, | |
943 | char *type, void *devdata, | |
944 | const struct thermal_cooling_device_ops *ops) | |
203d3d4a ZR |
945 | { |
946 | struct thermal_cooling_device *cdev; | |
4511f716 | 947 | struct thermal_zone_device *pos = NULL; |
203d3d4a ZR |
948 | int result; |
949 | ||
204dd1d3 | 950 | if (type && strlen(type) >= THERMAL_NAME_LENGTH) |
3e6fda5c | 951 | return ERR_PTR(-EINVAL); |
203d3d4a ZR |
952 | |
953 | if (!ops || !ops->get_max_state || !ops->get_cur_state || | |
543a9561 | 954 | !ops->set_cur_state) |
3e6fda5c | 955 | return ERR_PTR(-EINVAL); |
203d3d4a | 956 | |
95e3ed15 | 957 | cdev = kzalloc(sizeof(*cdev), GFP_KERNEL); |
203d3d4a | 958 | if (!cdev) |
3e6fda5c | 959 | return ERR_PTR(-ENOMEM); |
203d3d4a | 960 | |
b31ef828 MW |
961 | result = ida_simple_get(&thermal_cdev_ida, 0, 0, GFP_KERNEL); |
962 | if (result < 0) { | |
203d3d4a | 963 | kfree(cdev); |
3e6fda5c | 964 | return ERR_PTR(result); |
203d3d4a ZR |
965 | } |
966 | ||
b31ef828 | 967 | cdev->id = result; |
c7a8b9d9 | 968 | strlcpy(cdev->type, type ? : "", sizeof(cdev->type)); |
f4a821ce | 969 | mutex_init(&cdev->lock); |
b5e4ae62 | 970 | INIT_LIST_HEAD(&cdev->thermal_instances); |
a116b5d4 | 971 | cdev->np = np; |
203d3d4a | 972 | cdev->ops = ops; |
5ca0cce5 | 973 | cdev->updated = false; |
203d3d4a | 974 | cdev->device.class = &thermal_class; |
45cf2ec9 | 975 | thermal_cooling_device_setup_sysfs(cdev); |
203d3d4a | 976 | cdev->devdata = devdata; |
354655ea | 977 | dev_set_name(&cdev->device, "cooling_device%d", cdev->id); |
203d3d4a ZR |
978 | result = device_register(&cdev->device); |
979 | if (result) { | |
b31ef828 | 980 | ida_simple_remove(&thermal_cdev_ida, cdev->id); |
203d3d4a | 981 | kfree(cdev); |
3e6fda5c | 982 | return ERR_PTR(result); |
203d3d4a ZR |
983 | } |
984 | ||
7e8ee1e9 | 985 | /* Add 'this' new cdev to the global cdev list */ |
203d3d4a ZR |
986 | mutex_lock(&thermal_list_lock); |
987 | list_add(&cdev->node, &thermal_cdev_list); | |
203d3d4a ZR |
988 | mutex_unlock(&thermal_list_lock); |
989 | ||
7e8ee1e9 D |
990 | /* Update binding information for 'this' new cdev */ |
991 | bind_cdev(cdev); | |
992 | ||
4511f716 CY |
993 | mutex_lock(&thermal_list_lock); |
994 | list_for_each_entry(pos, &thermal_tz_list, node) | |
995 | if (atomic_cmpxchg(&pos->need_update, 1, 0)) | |
0e70f466 SP |
996 | thermal_zone_device_update(pos, |
997 | THERMAL_EVENT_UNSPECIFIED); | |
4511f716 CY |
998 | mutex_unlock(&thermal_list_lock); |
999 | ||
7e8ee1e9 | 1000 | return cdev; |
203d3d4a | 1001 | } |
a116b5d4 EV |
1002 | |
1003 | /** | |
1004 | * thermal_cooling_device_register() - register a new thermal cooling device | |
1005 | * @type: the thermal cooling device type. | |
1006 | * @devdata: device private data. | |
1007 | * @ops: standard thermal cooling devices callbacks. | |
1008 | * | |
1009 | * This interface function adds a new thermal cooling device (fan/processor/...) | |
1010 | * to /sys/class/thermal/ folder as cooling_device[0-*]. It tries to bind itself | |
1011 | * to all the thermal zone devices registered at the same time. | |
1012 | * | |
1013 | * Return: a pointer to the created struct thermal_cooling_device or an | |
1014 | * ERR_PTR. Caller must check return value with IS_ERR*() helpers. | |
1015 | */ | |
1016 | struct thermal_cooling_device * | |
1017 | thermal_cooling_device_register(char *type, void *devdata, | |
1018 | const struct thermal_cooling_device_ops *ops) | |
1019 | { | |
1020 | return __thermal_cooling_device_register(NULL, type, devdata, ops); | |
1021 | } | |
910cb1e3 | 1022 | EXPORT_SYMBOL_GPL(thermal_cooling_device_register); |
203d3d4a | 1023 | |
a116b5d4 EV |
1024 | /** |
1025 | * thermal_of_cooling_device_register() - register an OF thermal cooling device | |
1026 | * @np: a pointer to a device tree node. | |
1027 | * @type: the thermal cooling device type. | |
1028 | * @devdata: device private data. | |
1029 | * @ops: standard thermal cooling devices callbacks. | |
1030 | * | |
1031 | * This function will register a cooling device with device tree node reference. | |
1032 | * This interface function adds a new thermal cooling device (fan/processor/...) | |
1033 | * to /sys/class/thermal/ folder as cooling_device[0-*]. It tries to bind itself | |
1034 | * to all the thermal zone devices registered at the same time. | |
1035 | * | |
1036 | * Return: a pointer to the created struct thermal_cooling_device or an | |
1037 | * ERR_PTR. Caller must check return value with IS_ERR*() helpers. | |
1038 | */ | |
1039 | struct thermal_cooling_device * | |
1040 | thermal_of_cooling_device_register(struct device_node *np, | |
1041 | char *type, void *devdata, | |
1042 | const struct thermal_cooling_device_ops *ops) | |
1043 | { | |
1044 | return __thermal_cooling_device_register(np, type, devdata, ops); | |
1045 | } | |
1046 | EXPORT_SYMBOL_GPL(thermal_of_cooling_device_register); | |
1047 | ||
f11997fa EV |
1048 | static void __unbind(struct thermal_zone_device *tz, int mask, |
1049 | struct thermal_cooling_device *cdev) | |
1050 | { | |
1051 | int i; | |
1052 | ||
1053 | for (i = 0; i < tz->trips; i++) | |
1054 | if (mask & (1 << i)) | |
1055 | thermal_zone_unbind_cooling_device(tz, i, cdev); | |
1056 | } | |
1057 | ||
203d3d4a | 1058 | /** |
38e7b549 | 1059 | * thermal_cooling_device_unregister - removes a thermal cooling device |
203d3d4a ZR |
1060 | * @cdev: the thermal cooling device to remove. |
1061 | * | |
38e7b549 EV |
1062 | * thermal_cooling_device_unregister() must be called when a registered |
1063 | * thermal cooling device is no longer needed. | |
203d3d4a | 1064 | */ |
7e8ee1e9 | 1065 | void thermal_cooling_device_unregister(struct thermal_cooling_device *cdev) |
203d3d4a | 1066 | { |
7e8ee1e9 D |
1067 | int i; |
1068 | const struct thermal_zone_params *tzp; | |
203d3d4a ZR |
1069 | struct thermal_zone_device *tz; |
1070 | struct thermal_cooling_device *pos = NULL; | |
1071 | ||
1072 | if (!cdev) | |
1073 | return; | |
1074 | ||
1075 | mutex_lock(&thermal_list_lock); | |
1076 | list_for_each_entry(pos, &thermal_cdev_list, node) | |
b659a30d EV |
1077 | if (pos == cdev) |
1078 | break; | |
203d3d4a ZR |
1079 | if (pos != cdev) { |
1080 | /* thermal cooling device not found */ | |
1081 | mutex_unlock(&thermal_list_lock); | |
1082 | return; | |
1083 | } | |
1084 | list_del(&cdev->node); | |
7e8ee1e9 D |
1085 | |
1086 | /* Unbind all thermal zones associated with 'this' cdev */ | |
203d3d4a | 1087 | list_for_each_entry(tz, &thermal_tz_list, node) { |
7e8ee1e9 D |
1088 | if (tz->ops->unbind) { |
1089 | tz->ops->unbind(tz, cdev); | |
1090 | continue; | |
1091 | } | |
1092 | ||
1093 | if (!tz->tzp || !tz->tzp->tbp) | |
203d3d4a | 1094 | continue; |
7e8ee1e9 D |
1095 | |
1096 | tzp = tz->tzp; | |
1097 | for (i = 0; i < tzp->num_tbps; i++) { | |
1098 | if (tzp->tbp[i].cdev == cdev) { | |
1099 | __unbind(tz, tzp->tbp[i].trip_mask, cdev); | |
1100 | tzp->tbp[i].cdev = NULL; | |
1101 | } | |
1102 | } | |
203d3d4a | 1103 | } |
7e8ee1e9 | 1104 | |
203d3d4a | 1105 | mutex_unlock(&thermal_list_lock); |
7e8ee1e9 | 1106 | |
b31ef828 | 1107 | ida_simple_remove(&thermal_cdev_ida, cdev->id); |
203d3d4a | 1108 | device_unregister(&cdev->device); |
203d3d4a | 1109 | } |
910cb1e3 | 1110 | EXPORT_SYMBOL_GPL(thermal_cooling_device_unregister); |
203d3d4a | 1111 | |
90f5b5bb | 1112 | static void bind_tz(struct thermal_zone_device *tz) |
ce119f83 | 1113 | { |
90f5b5bb EV |
1114 | int i, ret; |
1115 | struct thermal_cooling_device *pos = NULL; | |
1116 | const struct thermal_zone_params *tzp = tz->tzp; | |
ce119f83 | 1117 | |
90f5b5bb | 1118 | if (!tzp && !tz->ops->bind) |
ce119f83 | 1119 | return; |
c56f5c03 | 1120 | |
90f5b5bb | 1121 | mutex_lock(&thermal_list_lock); |
c56f5c03 | 1122 | |
90f5b5bb EV |
1123 | /* If there is ops->bind, try to use ops->bind */ |
1124 | if (tz->ops->bind) { | |
1125 | list_for_each_entry(pos, &thermal_cdev_list, node) { | |
1126 | ret = tz->ops->bind(tz, pos); | |
1127 | if (ret) | |
1128 | print_bind_err_msg(tz, pos, ret); | |
27365a6c | 1129 | } |
90f5b5bb | 1130 | goto exit; |
27365a6c | 1131 | } |
c56f5c03 | 1132 | |
90f5b5bb EV |
1133 | if (!tzp || !tzp->tbp) |
1134 | goto exit; | |
27365a6c | 1135 | |
90f5b5bb EV |
1136 | list_for_each_entry(pos, &thermal_cdev_list, node) { |
1137 | for (i = 0; i < tzp->num_tbps; i++) { | |
1138 | if (tzp->tbp[i].cdev || !tzp->tbp[i].match) | |
1139 | continue; | |
1140 | if (tzp->tbp[i].match(tz, pos)) | |
1141 | continue; | |
1142 | tzp->tbp[i].cdev = pos; | |
1143 | __bind(tz, tzp->tbp[i].trip_mask, pos, | |
1144 | tzp->tbp[i].binding_limits, | |
1145 | tzp->tbp[i].weight); | |
27365a6c | 1146 | } |
c56f5c03 | 1147 | } |
90f5b5bb EV |
1148 | exit: |
1149 | mutex_unlock(&thermal_list_lock); | |
c56f5c03 D |
1150 | } |
1151 | ||
203d3d4a | 1152 | /** |
a00e55f9 | 1153 | * thermal_zone_device_register() - register a new thermal zone device |
203d3d4a ZR |
1154 | * @type: the thermal zone device type |
1155 | * @trips: the number of trip points the thermal zone support | |
c56f5c03 | 1156 | * @mask: a bit string indicating the writeablility of trip points |
203d3d4a ZR |
1157 | * @devdata: private device data |
1158 | * @ops: standard thermal zone device callbacks | |
50125a9b | 1159 | * @tzp: thermal zone platform parameters |
b1569e99 MG |
1160 | * @passive_delay: number of milliseconds to wait between polls when |
1161 | * performing passive cooling | |
1162 | * @polling_delay: number of milliseconds to wait between polls when checking | |
1163 | * whether trip points have been crossed (0 for interrupt | |
1164 | * driven systems) | |
203d3d4a | 1165 | * |
a00e55f9 EV |
1166 | * This interface function adds a new thermal zone device (sensor) to |
1167 | * /sys/class/thermal folder as thermal_zone[0-*]. It tries to bind all the | |
1168 | * thermal cooling devices registered at the same time. | |
203d3d4a | 1169 | * thermal_zone_device_unregister() must be called when the device is no |
1b7ddb84 | 1170 | * longer needed. The passive cooling depends on the .get_trend() return value. |
a00e55f9 EV |
1171 | * |
1172 | * Return: a pointer to the created struct thermal_zone_device or an | |
1173 | * in case of error, an ERR_PTR. Caller must check return value with | |
1174 | * IS_ERR*() helpers. | |
203d3d4a | 1175 | */ |
eb7be329 EV |
1176 | struct thermal_zone_device * |
1177 | thermal_zone_device_register(const char *type, int trips, int mask, | |
1178 | void *devdata, struct thermal_zone_device_ops *ops, | |
1179 | struct thermal_zone_params *tzp, int passive_delay, | |
1180 | int polling_delay) | |
203d3d4a ZR |
1181 | { |
1182 | struct thermal_zone_device *tz; | |
03a971a2 | 1183 | enum thermal_trip_type trip_type; |
81ad4276 | 1184 | int trip_temp; |
203d3d4a ZR |
1185 | int result; |
1186 | int count; | |
e33df1d2 | 1187 | struct thermal_governor *governor; |
203d3d4a | 1188 | |
54fa38cc EV |
1189 | if (!type || strlen(type) == 0) |
1190 | return ERR_PTR(-EINVAL); | |
1191 | ||
204dd1d3 | 1192 | if (type && strlen(type) >= THERMAL_NAME_LENGTH) |
3e6fda5c | 1193 | return ERR_PTR(-EINVAL); |
203d3d4a | 1194 | |
c56f5c03 | 1195 | if (trips > THERMAL_MAX_TRIPS || trips < 0 || mask >> trips) |
3e6fda5c | 1196 | return ERR_PTR(-EINVAL); |
203d3d4a | 1197 | |
81bd4e1c | 1198 | if (!ops) |
3e6fda5c | 1199 | return ERR_PTR(-EINVAL); |
203d3d4a | 1200 | |
83720d0b | 1201 | if (trips > 0 && (!ops->get_trip_type || !ops->get_trip_temp)) |
6b2aa51d EV |
1202 | return ERR_PTR(-EINVAL); |
1203 | ||
95e3ed15 | 1204 | tz = kzalloc(sizeof(*tz), GFP_KERNEL); |
203d3d4a | 1205 | if (!tz) |
3e6fda5c | 1206 | return ERR_PTR(-ENOMEM); |
203d3d4a | 1207 | |
2d374139 | 1208 | INIT_LIST_HEAD(&tz->thermal_instances); |
b31ef828 | 1209 | ida_init(&tz->ida); |
203d3d4a | 1210 | mutex_init(&tz->lock); |
b31ef828 | 1211 | result = ida_simple_get(&thermal_tz_ida, 0, 0, GFP_KERNEL); |
9d9ca1f9 CJ |
1212 | if (result < 0) |
1213 | goto free_tz; | |
203d3d4a | 1214 | |
b31ef828 | 1215 | tz->id = result; |
54fa38cc | 1216 | strlcpy(tz->type, type, sizeof(tz->type)); |
203d3d4a | 1217 | tz->ops = ops; |
50125a9b | 1218 | tz->tzp = tzp; |
203d3d4a ZR |
1219 | tz->device.class = &thermal_class; |
1220 | tz->devdata = devdata; | |
1221 | tz->trips = trips; | |
b1569e99 MG |
1222 | tz->passive_delay = passive_delay; |
1223 | tz->polling_delay = polling_delay; | |
1c600861 | 1224 | |
4d0fe749 | 1225 | /* sys I/F */ |
1c600861 | 1226 | /* Add nodes that are always present via .groups */ |
4d0fe749 EV |
1227 | result = thermal_zone_create_device_groups(tz, mask); |
1228 | if (result) | |
9d9ca1f9 | 1229 | goto remove_id; |
4d0fe749 | 1230 | |
4511f716 CY |
1231 | /* A new thermal zone needs to be updated anyway. */ |
1232 | atomic_set(&tz->need_update, 1); | |
b1569e99 | 1233 | |
354655ea | 1234 | dev_set_name(&tz->device, "thermal_zone%d", tz->id); |
203d3d4a | 1235 | result = device_register(&tz->device); |
9d9ca1f9 CJ |
1236 | if (result) |
1237 | goto remove_device_groups; | |
203d3d4a | 1238 | |
203d3d4a | 1239 | for (count = 0; count < trips; count++) { |
81ad4276 ZR |
1240 | if (tz->ops->get_trip_type(tz, count, &trip_type)) |
1241 | set_bit(count, &tz->trips_disabled); | |
81ad4276 ZR |
1242 | if (tz->ops->get_trip_temp(tz, count, &trip_temp)) |
1243 | set_bit(count, &tz->trips_disabled); | |
1244 | /* Check for bogus trip points */ | |
1245 | if (trip_temp == 0) | |
1246 | set_bit(count, &tz->trips_disabled); | |
203d3d4a ZR |
1247 | } |
1248 | ||
a4a15485 D |
1249 | /* Update 'this' zone's governor information */ |
1250 | mutex_lock(&thermal_governor_lock); | |
1251 | ||
1252 | if (tz->tzp) | |
e33df1d2 | 1253 | governor = __find_governor(tz->tzp->governor_name); |
a4a15485 | 1254 | else |
e33df1d2 JM |
1255 | governor = def_governor; |
1256 | ||
1257 | result = thermal_set_governor(tz, governor); | |
1258 | if (result) { | |
1259 | mutex_unlock(&thermal_governor_lock); | |
1260 | goto unregister; | |
1261 | } | |
a4a15485 D |
1262 | |
1263 | mutex_unlock(&thermal_governor_lock); | |
1264 | ||
ccba4ffd EV |
1265 | if (!tz->tzp || !tz->tzp->no_hwmon) { |
1266 | result = thermal_add_hwmon_sysfs(tz); | |
1267 | if (result) | |
1268 | goto unregister; | |
1269 | } | |
e68b16ab | 1270 | |
203d3d4a ZR |
1271 | mutex_lock(&thermal_list_lock); |
1272 | list_add_tail(&tz->node, &thermal_tz_list); | |
203d3d4a ZR |
1273 | mutex_unlock(&thermal_list_lock); |
1274 | ||
7e8ee1e9 D |
1275 | /* Bind cooling devices for this zone */ |
1276 | bind_tz(tz); | |
1277 | ||
b659a30d | 1278 | INIT_DELAYED_WORK(&tz->poll_queue, thermal_zone_device_check); |
b1569e99 | 1279 | |
bb431ba2 | 1280 | thermal_zone_device_reset(tz); |
4511f716 CY |
1281 | /* Update the new thermal zone and mark it as already updated. */ |
1282 | if (atomic_cmpxchg(&tz->need_update, 1, 0)) | |
0e70f466 | 1283 | thermal_zone_device_update(tz, THERMAL_EVENT_UNSPECIFIED); |
b1569e99 | 1284 | |
14015860 | 1285 | return tz; |
203d3d4a | 1286 | |
caca8b80 | 1287 | unregister: |
b31ef828 | 1288 | ida_simple_remove(&thermal_tz_ida, tz->id); |
203d3d4a | 1289 | device_unregister(&tz->device); |
3e6fda5c | 1290 | return ERR_PTR(result); |
9d9ca1f9 CJ |
1291 | |
1292 | remove_device_groups: | |
1293 | thermal_zone_destroy_device_groups(tz); | |
1294 | remove_id: | |
1295 | ida_simple_remove(&thermal_tz_ida, tz->id); | |
1296 | free_tz: | |
1297 | kfree(tz); | |
1298 | return ERR_PTR(result); | |
203d3d4a | 1299 | } |
910cb1e3 | 1300 | EXPORT_SYMBOL_GPL(thermal_zone_device_register); |
203d3d4a ZR |
1301 | |
1302 | /** | |
1303 | * thermal_device_unregister - removes the registered thermal zone device | |
203d3d4a ZR |
1304 | * @tz: the thermal zone device to remove |
1305 | */ | |
1306 | void thermal_zone_device_unregister(struct thermal_zone_device *tz) | |
1307 | { | |
7e8ee1e9 D |
1308 | int i; |
1309 | const struct thermal_zone_params *tzp; | |
203d3d4a ZR |
1310 | struct thermal_cooling_device *cdev; |
1311 | struct thermal_zone_device *pos = NULL; | |
203d3d4a ZR |
1312 | |
1313 | if (!tz) | |
1314 | return; | |
1315 | ||
7e8ee1e9 D |
1316 | tzp = tz->tzp; |
1317 | ||
203d3d4a ZR |
1318 | mutex_lock(&thermal_list_lock); |
1319 | list_for_each_entry(pos, &thermal_tz_list, node) | |
b659a30d EV |
1320 | if (pos == tz) |
1321 | break; | |
203d3d4a ZR |
1322 | if (pos != tz) { |
1323 | /* thermal zone device not found */ | |
1324 | mutex_unlock(&thermal_list_lock); | |
1325 | return; | |
1326 | } | |
1327 | list_del(&tz->node); | |
7e8ee1e9 D |
1328 | |
1329 | /* Unbind all cdevs associated with 'this' thermal zone */ | |
1330 | list_for_each_entry(cdev, &thermal_cdev_list, node) { | |
1331 | if (tz->ops->unbind) { | |
1332 | tz->ops->unbind(tz, cdev); | |
1333 | continue; | |
1334 | } | |
1335 | ||
1336 | if (!tzp || !tzp->tbp) | |
1337 | break; | |
1338 | ||
1339 | for (i = 0; i < tzp->num_tbps; i++) { | |
1340 | if (tzp->tbp[i].cdev == cdev) { | |
1341 | __unbind(tz, tzp->tbp[i].trip_mask, cdev); | |
1342 | tzp->tbp[i].cdev = NULL; | |
1343 | } | |
1344 | } | |
1345 | } | |
1346 | ||
203d3d4a ZR |
1347 | mutex_unlock(&thermal_list_lock); |
1348 | ||
b1569e99 MG |
1349 | thermal_zone_device_set_polling(tz, 0); |
1350 | ||
e33df1d2 | 1351 | thermal_set_governor(tz, NULL); |
203d3d4a | 1352 | |
e68b16ab | 1353 | thermal_remove_hwmon_sysfs(tz); |
b31ef828 MW |
1354 | ida_simple_remove(&thermal_tz_ida, tz->id); |
1355 | ida_destroy(&tz->ida); | |
203d3d4a ZR |
1356 | mutex_destroy(&tz->lock); |
1357 | device_unregister(&tz->device); | |
203d3d4a | 1358 | } |
910cb1e3 | 1359 | EXPORT_SYMBOL_GPL(thermal_zone_device_unregister); |
203d3d4a | 1360 | |
63c4d919 EV |
1361 | /** |
1362 | * thermal_zone_get_zone_by_name() - search for a zone and returns its ref | |
1363 | * @name: thermal zone name to fetch the temperature | |
1364 | * | |
1365 | * When only one zone is found with the passed name, returns a reference to it. | |
1366 | * | |
1367 | * Return: On success returns a reference to an unique thermal zone with | |
1368 | * matching name equals to @name, an ERR_PTR otherwise (-EINVAL for invalid | |
1369 | * paramenters, -ENODEV for not found and -EEXIST for multiple matches). | |
1370 | */ | |
1371 | struct thermal_zone_device *thermal_zone_get_zone_by_name(const char *name) | |
1372 | { | |
1373 | struct thermal_zone_device *pos = NULL, *ref = ERR_PTR(-EINVAL); | |
1374 | unsigned int found = 0; | |
1375 | ||
1376 | if (!name) | |
1377 | goto exit; | |
1378 | ||
1379 | mutex_lock(&thermal_list_lock); | |
1380 | list_for_each_entry(pos, &thermal_tz_list, node) | |
484ac2f3 | 1381 | if (!strncasecmp(name, pos->type, THERMAL_NAME_LENGTH)) { |
63c4d919 EV |
1382 | found++; |
1383 | ref = pos; | |
1384 | } | |
1385 | mutex_unlock(&thermal_list_lock); | |
1386 | ||
1387 | /* nothing has been found, thus an error code for it */ | |
1388 | if (found == 0) | |
1389 | ref = ERR_PTR(-ENODEV); | |
1390 | else if (found > 1) | |
1391 | /* Success only when an unique zone is found */ | |
1392 | ref = ERR_PTR(-EEXIST); | |
1393 | ||
1394 | exit: | |
1395 | return ref; | |
1396 | } | |
1397 | EXPORT_SYMBOL_GPL(thermal_zone_get_zone_by_name); | |
1398 | ||
af06216a | 1399 | #ifdef CONFIG_NET |
2a94fe48 JB |
1400 | static const struct genl_multicast_group thermal_event_mcgrps[] = { |
1401 | { .name = THERMAL_GENL_MCAST_GROUP_NAME, }, | |
1402 | }; | |
1403 | ||
56989f6d | 1404 | static struct genl_family thermal_event_genl_family __ro_after_init = { |
489111e5 | 1405 | .module = THIS_MODULE, |
af06216a RW |
1406 | .name = THERMAL_GENL_FAMILY_NAME, |
1407 | .version = THERMAL_GENL_VERSION, | |
1408 | .maxattr = THERMAL_GENL_ATTR_MAX, | |
2a94fe48 JB |
1409 | .mcgrps = thermal_event_mcgrps, |
1410 | .n_mcgrps = ARRAY_SIZE(thermal_event_mcgrps), | |
af06216a RW |
1411 | }; |
1412 | ||
8ab3e6a0 | 1413 | int thermal_generate_netlink_event(struct thermal_zone_device *tz, |
eb7be329 | 1414 | enum events event) |
4cb18728 D |
1415 | { |
1416 | struct sk_buff *skb; | |
1417 | struct nlattr *attr; | |
1418 | struct thermal_genl_event *thermal_event; | |
1419 | void *msg_header; | |
1420 | int size; | |
1421 | int result; | |
b11de07c | 1422 | static unsigned int thermal_event_seqnum; |
4cb18728 | 1423 | |
8ab3e6a0 EV |
1424 | if (!tz) |
1425 | return -EINVAL; | |
1426 | ||
4cb18728 | 1427 | /* allocate memory */ |
886ee546 JP |
1428 | size = nla_total_size(sizeof(struct thermal_genl_event)) + |
1429 | nla_total_size(0); | |
4cb18728 D |
1430 | |
1431 | skb = genlmsg_new(size, GFP_ATOMIC); | |
1432 | if (!skb) | |
1433 | return -ENOMEM; | |
1434 | ||
1435 | /* add the genetlink message header */ | |
1436 | msg_header = genlmsg_put(skb, 0, thermal_event_seqnum++, | |
1437 | &thermal_event_genl_family, 0, | |
1438 | THERMAL_GENL_CMD_EVENT); | |
1439 | if (!msg_header) { | |
1440 | nlmsg_free(skb); | |
1441 | return -ENOMEM; | |
1442 | } | |
1443 | ||
1444 | /* fill the data */ | |
886ee546 JP |
1445 | attr = nla_reserve(skb, THERMAL_GENL_ATTR_EVENT, |
1446 | sizeof(struct thermal_genl_event)); | |
4cb18728 D |
1447 | |
1448 | if (!attr) { | |
1449 | nlmsg_free(skb); | |
1450 | return -EINVAL; | |
1451 | } | |
1452 | ||
1453 | thermal_event = nla_data(attr); | |
1454 | if (!thermal_event) { | |
1455 | nlmsg_free(skb); | |
1456 | return -EINVAL; | |
1457 | } | |
1458 | ||
1459 | memset(thermal_event, 0, sizeof(struct thermal_genl_event)); | |
1460 | ||
8ab3e6a0 | 1461 | thermal_event->orig = tz->id; |
4cb18728 D |
1462 | thermal_event->event = event; |
1463 | ||
1464 | /* send multicast genetlink message */ | |
053c095a | 1465 | genlmsg_end(skb, msg_header); |
4cb18728 | 1466 | |
68eb5503 | 1467 | result = genlmsg_multicast(&thermal_event_genl_family, skb, 0, |
2a94fe48 | 1468 | 0, GFP_ATOMIC); |
4cb18728 | 1469 | if (result) |
923e0b1e | 1470 | dev_err(&tz->device, "Failed to send netlink event:%d", result); |
4cb18728 D |
1471 | |
1472 | return result; | |
1473 | } | |
910cb1e3 | 1474 | EXPORT_SYMBOL_GPL(thermal_generate_netlink_event); |
4cb18728 | 1475 | |
56989f6d | 1476 | static int __init genetlink_init(void) |
4cb18728 | 1477 | { |
2a94fe48 | 1478 | return genl_register_family(&thermal_event_genl_family); |
4cb18728 D |
1479 | } |
1480 | ||
af06216a RW |
1481 | static void genetlink_exit(void) |
1482 | { | |
1483 | genl_unregister_family(&thermal_event_genl_family); | |
1484 | } | |
1485 | #else /* !CONFIG_NET */ | |
1486 | static inline int genetlink_init(void) { return 0; } | |
1487 | static inline void genetlink_exit(void) {} | |
1488 | #endif /* !CONFIG_NET */ | |
1489 | ||
ff140fea | 1490 | static int thermal_pm_notify(struct notifier_block *nb, |
eb7be329 | 1491 | unsigned long mode, void *_unused) |
ff140fea ZR |
1492 | { |
1493 | struct thermal_zone_device *tz; | |
1494 | ||
1495 | switch (mode) { | |
1496 | case PM_HIBERNATION_PREPARE: | |
1497 | case PM_RESTORE_PREPARE: | |
1498 | case PM_SUSPEND_PREPARE: | |
1499 | atomic_set(&in_suspend, 1); | |
1500 | break; | |
1501 | case PM_POST_HIBERNATION: | |
1502 | case PM_POST_RESTORE: | |
1503 | case PM_POST_SUSPEND: | |
1504 | atomic_set(&in_suspend, 0); | |
1505 | list_for_each_entry(tz, &thermal_tz_list, node) { | |
1506 | thermal_zone_device_reset(tz); | |
0e70f466 SP |
1507 | thermal_zone_device_update(tz, |
1508 | THERMAL_EVENT_UNSPECIFIED); | |
ff140fea ZR |
1509 | } |
1510 | break; | |
1511 | default: | |
1512 | break; | |
1513 | } | |
1514 | return 0; | |
1515 | } | |
1516 | ||
1517 | static struct notifier_block thermal_pm_nb = { | |
1518 | .notifier_call = thermal_pm_notify, | |
1519 | }; | |
1520 | ||
203d3d4a ZR |
1521 | static int __init thermal_init(void) |
1522 | { | |
80a26a5c ZR |
1523 | int result; |
1524 | ||
e441fd68 | 1525 | mutex_init(&poweroff_lock); |
80a26a5c ZR |
1526 | result = thermal_register_governors(); |
1527 | if (result) | |
1528 | goto error; | |
203d3d4a ZR |
1529 | |
1530 | result = class_register(&thermal_class); | |
80a26a5c ZR |
1531 | if (result) |
1532 | goto unregister_governors; | |
1533 | ||
4cb18728 | 1534 | result = genetlink_init(); |
80a26a5c ZR |
1535 | if (result) |
1536 | goto unregister_class; | |
1537 | ||
4e5e4705 EV |
1538 | result = of_parse_thermal_zones(); |
1539 | if (result) | |
1540 | goto exit_netlink; | |
1541 | ||
ff140fea ZR |
1542 | result = register_pm_notifier(&thermal_pm_nb); |
1543 | if (result) | |
1544 | pr_warn("Thermal: Can not register suspend notifier, return %d\n", | |
1545 | result); | |
1546 | ||
80a26a5c ZR |
1547 | return 0; |
1548 | ||
4e5e4705 EV |
1549 | exit_netlink: |
1550 | genetlink_exit(); | |
80a26a5c ZR |
1551 | unregister_class: |
1552 | class_unregister(&thermal_class); | |
9d367e5e LH |
1553 | unregister_governors: |
1554 | thermal_unregister_governors(); | |
80a26a5c | 1555 | error: |
b31ef828 MW |
1556 | ida_destroy(&thermal_tz_ida); |
1557 | ida_destroy(&thermal_cdev_ida); | |
80a26a5c ZR |
1558 | mutex_destroy(&thermal_list_lock); |
1559 | mutex_destroy(&thermal_governor_lock); | |
e441fd68 | 1560 | mutex_destroy(&poweroff_lock); |
203d3d4a ZR |
1561 | return result; |
1562 | } | |
1563 | ||
1564 | static void __exit thermal_exit(void) | |
1565 | { | |
ff140fea | 1566 | unregister_pm_notifier(&thermal_pm_nb); |
4e5e4705 | 1567 | of_thermal_destroy_zones(); |
80a26a5c | 1568 | genetlink_exit(); |
203d3d4a | 1569 | class_unregister(&thermal_class); |
80a26a5c | 1570 | thermal_unregister_governors(); |
b31ef828 MW |
1571 | ida_destroy(&thermal_tz_ida); |
1572 | ida_destroy(&thermal_cdev_ida); | |
203d3d4a | 1573 | mutex_destroy(&thermal_list_lock); |
80a26a5c | 1574 | mutex_destroy(&thermal_governor_lock); |
203d3d4a ZR |
1575 | } |
1576 | ||
4cb18728 | 1577 | fs_initcall(thermal_init); |
203d3d4a | 1578 | module_exit(thermal_exit); |