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7e3c0381 | 1 | // SPDX-License-Identifier: GPL-2.0 |
203d3d4a ZR |
2 | /* |
3 | * thermal.c - Generic Thermal Management Sysfs support. | |
4 | * | |
5 | * Copyright (C) 2008 Intel Corp | |
6 | * Copyright (C) 2008 Zhang Rui <rui.zhang@intel.com> | |
7 | * Copyright (C) 2008 Sujith Thomas <sujith.thomas@intel.com> | |
203d3d4a ZR |
8 | */ |
9 | ||
c5a01dd5 JP |
10 | #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt |
11 | ||
203d3d4a ZR |
12 | #include <linux/device.h> |
13 | #include <linux/err.h> | |
3f0cfea3 | 14 | #include <linux/export.h> |
5a0e3ad6 | 15 | #include <linux/slab.h> |
203d3d4a ZR |
16 | #include <linux/kdev_t.h> |
17 | #include <linux/idr.h> | |
18 | #include <linux/thermal.h> | |
b1569e99 | 19 | #include <linux/reboot.h> |
42a5bf50 | 20 | #include <linux/string.h> |
a116b5d4 | 21 | #include <linux/of.h> |
ff140fea | 22 | #include <linux/suspend.h> |
203d3d4a | 23 | |
100a8fdb PA |
24 | #define CREATE_TRACE_POINTS |
25 | #include <trace/events/thermal.h> | |
26 | ||
71350db4 | 27 | #include "thermal_core.h" |
0dd88793 | 28 | #include "thermal_hwmon.h" |
71350db4 | 29 | |
b31ef828 MW |
30 | static DEFINE_IDA(thermal_tz_ida); |
31 | static DEFINE_IDA(thermal_cdev_ida); | |
203d3d4a ZR |
32 | |
33 | static LIST_HEAD(thermal_tz_list); | |
34 | static LIST_HEAD(thermal_cdev_list); | |
a4a15485 D |
35 | static LIST_HEAD(thermal_governor_list); |
36 | ||
203d3d4a | 37 | static DEFINE_MUTEX(thermal_list_lock); |
a4a15485 | 38 | static DEFINE_MUTEX(thermal_governor_lock); |
e441fd68 | 39 | static DEFINE_MUTEX(poweroff_lock); |
a4a15485 | 40 | |
ff140fea | 41 | static atomic_t in_suspend; |
e441fd68 | 42 | static bool power_off_triggered; |
ff140fea | 43 | |
f2234bcd ZR |
44 | static struct thermal_governor *def_governor; |
45 | ||
1b4f4849 EV |
46 | /* |
47 | * Governor section: set of functions to handle thermal governors | |
48 | * | |
49 | * Functions to help in the life cycle of thermal governors within | |
50 | * the thermal core and by the thermal governor code. | |
51 | */ | |
52 | ||
a4a15485 D |
53 | static struct thermal_governor *__find_governor(const char *name) |
54 | { | |
55 | struct thermal_governor *pos; | |
56 | ||
f2234bcd ZR |
57 | if (!name || !name[0]) |
58 | return def_governor; | |
59 | ||
a4a15485 | 60 | list_for_each_entry(pos, &thermal_governor_list, governor_list) |
484ac2f3 | 61 | if (!strncasecmp(name, pos->name, THERMAL_NAME_LENGTH)) |
a4a15485 D |
62 | return pos; |
63 | ||
64 | return NULL; | |
65 | } | |
66 | ||
e33df1d2 JM |
67 | /** |
68 | * bind_previous_governor() - bind the previous governor of the thermal zone | |
69 | * @tz: a valid pointer to a struct thermal_zone_device | |
70 | * @failed_gov_name: the name of the governor that failed to register | |
71 | * | |
72 | * Register the previous governor of the thermal zone after a new | |
73 | * governor has failed to be bound. | |
74 | */ | |
75 | static void bind_previous_governor(struct thermal_zone_device *tz, | |
76 | const char *failed_gov_name) | |
77 | { | |
78 | if (tz->governor && tz->governor->bind_to_tz) { | |
79 | if (tz->governor->bind_to_tz(tz)) { | |
80 | dev_err(&tz->device, | |
81 | "governor %s failed to bind and the previous one (%s) failed to bind again, thermal zone %s has no governor\n", | |
82 | failed_gov_name, tz->governor->name, tz->type); | |
83 | tz->governor = NULL; | |
84 | } | |
85 | } | |
86 | } | |
87 | ||
88 | /** | |
89 | * thermal_set_governor() - Switch to another governor | |
90 | * @tz: a valid pointer to a struct thermal_zone_device | |
91 | * @new_gov: pointer to the new governor | |
92 | * | |
93 | * Change the governor of thermal zone @tz. | |
94 | * | |
95 | * Return: 0 on success, an error if the new governor's bind_to_tz() failed. | |
96 | */ | |
97 | static int thermal_set_governor(struct thermal_zone_device *tz, | |
98 | struct thermal_governor *new_gov) | |
99 | { | |
100 | int ret = 0; | |
101 | ||
102 | if (tz->governor && tz->governor->unbind_from_tz) | |
103 | tz->governor->unbind_from_tz(tz); | |
104 | ||
105 | if (new_gov && new_gov->bind_to_tz) { | |
106 | ret = new_gov->bind_to_tz(tz); | |
107 | if (ret) { | |
108 | bind_previous_governor(tz, new_gov->name); | |
109 | ||
110 | return ret; | |
111 | } | |
112 | } | |
113 | ||
114 | tz->governor = new_gov; | |
115 | ||
116 | return ret; | |
117 | } | |
118 | ||
a4a15485 D |
119 | int thermal_register_governor(struct thermal_governor *governor) |
120 | { | |
121 | int err; | |
122 | const char *name; | |
123 | struct thermal_zone_device *pos; | |
124 | ||
125 | if (!governor) | |
126 | return -EINVAL; | |
127 | ||
128 | mutex_lock(&thermal_governor_lock); | |
129 | ||
130 | err = -EBUSY; | |
5027ba36 | 131 | if (!__find_governor(governor->name)) { |
eb7be329 EV |
132 | bool match_default; |
133 | ||
a4a15485 D |
134 | err = 0; |
135 | list_add(&governor->governor_list, &thermal_governor_list); | |
eb7be329 EV |
136 | match_default = !strncmp(governor->name, |
137 | DEFAULT_THERMAL_GOVERNOR, | |
138 | THERMAL_NAME_LENGTH); | |
139 | ||
140 | if (!def_governor && match_default) | |
f2234bcd | 141 | def_governor = governor; |
a4a15485 D |
142 | } |
143 | ||
144 | mutex_lock(&thermal_list_lock); | |
145 | ||
146 | list_for_each_entry(pos, &thermal_tz_list, node) { | |
f2234bcd ZR |
147 | /* |
148 | * only thermal zones with specified tz->tzp->governor_name | |
149 | * may run with tz->govenor unset | |
150 | */ | |
a4a15485 D |
151 | if (pos->governor) |
152 | continue; | |
f2234bcd ZR |
153 | |
154 | name = pos->tzp->governor_name; | |
155 | ||
e33df1d2 JM |
156 | if (!strncasecmp(name, governor->name, THERMAL_NAME_LENGTH)) { |
157 | int ret; | |
158 | ||
159 | ret = thermal_set_governor(pos, governor); | |
160 | if (ret) | |
161 | dev_err(&pos->device, | |
162 | "Failed to set governor %s for thermal zone %s: %d\n", | |
163 | governor->name, pos->type, ret); | |
164 | } | |
a4a15485 D |
165 | } |
166 | ||
167 | mutex_unlock(&thermal_list_lock); | |
168 | mutex_unlock(&thermal_governor_lock); | |
169 | ||
170 | return err; | |
171 | } | |
a4a15485 D |
172 | |
173 | void thermal_unregister_governor(struct thermal_governor *governor) | |
174 | { | |
175 | struct thermal_zone_device *pos; | |
176 | ||
177 | if (!governor) | |
178 | return; | |
179 | ||
180 | mutex_lock(&thermal_governor_lock); | |
181 | ||
5027ba36 | 182 | if (!__find_governor(governor->name)) |
a4a15485 D |
183 | goto exit; |
184 | ||
185 | mutex_lock(&thermal_list_lock); | |
186 | ||
187 | list_for_each_entry(pos, &thermal_tz_list, node) { | |
484ac2f3 | 188 | if (!strncasecmp(pos->governor->name, governor->name, |
eb7be329 | 189 | THERMAL_NAME_LENGTH)) |
e33df1d2 | 190 | thermal_set_governor(pos, NULL); |
a4a15485 D |
191 | } |
192 | ||
193 | mutex_unlock(&thermal_list_lock); | |
194 | list_del(&governor->governor_list); | |
195 | exit: | |
196 | mutex_unlock(&thermal_governor_lock); | |
9b4298a0 | 197 | } |
9b4298a0 | 198 | |
1b4f4849 EV |
199 | int thermal_zone_device_set_policy(struct thermal_zone_device *tz, |
200 | char *policy) | |
9b4298a0 | 201 | { |
1b4f4849 EV |
202 | struct thermal_governor *gov; |
203 | int ret = -EINVAL; | |
9b4298a0 | 204 | |
1b4f4849 | 205 | mutex_lock(&thermal_governor_lock); |
9b4298a0 | 206 | mutex_lock(&tz->lock); |
9b4298a0 | 207 | |
1b4f4849 EV |
208 | gov = __find_governor(strim(policy)); |
209 | if (!gov) | |
210 | goto exit; | |
9b4298a0 | 211 | |
1b4f4849 | 212 | ret = thermal_set_governor(tz, gov); |
9b4298a0 | 213 | |
1b4f4849 EV |
214 | exit: |
215 | mutex_unlock(&tz->lock); | |
216 | mutex_unlock(&thermal_governor_lock); | |
9b4298a0 | 217 | |
1b4f4849 | 218 | return ret; |
7e8ee1e9 D |
219 | } |
220 | ||
1b4f4849 | 221 | int thermal_build_list_of_policies(char *buf) |
7e8ee1e9 | 222 | { |
1b4f4849 EV |
223 | struct thermal_governor *pos; |
224 | ssize_t count = 0; | |
225 | ssize_t size = PAGE_SIZE; | |
7e8ee1e9 | 226 | |
1b4f4849 | 227 | mutex_lock(&thermal_governor_lock); |
a8892d83 | 228 | |
1b4f4849 EV |
229 | list_for_each_entry(pos, &thermal_governor_list, governor_list) { |
230 | size = PAGE_SIZE - count; | |
231 | count += scnprintf(buf + count, size, "%s ", pos->name); | |
7e8ee1e9 | 232 | } |
1b4f4849 | 233 | count += scnprintf(buf + count, size, "\n"); |
7e8ee1e9 | 234 | |
1b4f4849 | 235 | mutex_unlock(&thermal_governor_lock); |
7e8ee1e9 | 236 | |
1b4f4849 | 237 | return count; |
7e8ee1e9 D |
238 | } |
239 | ||
57c5b2ec | 240 | static void __init thermal_unregister_governors(void) |
7e8ee1e9 | 241 | { |
57c5b2ec DL |
242 | struct thermal_governor **governor; |
243 | ||
244 | for_each_governor_table(governor) | |
245 | thermal_unregister_governor(*governor); | |
246 | } | |
7e8ee1e9 | 247 | |
57c5b2ec DL |
248 | static int __init thermal_register_governors(void) |
249 | { | |
250 | int ret = 0; | |
251 | struct thermal_governor **governor; | |
7e8ee1e9 | 252 | |
57c5b2ec DL |
253 | for_each_governor_table(governor) { |
254 | ret = thermal_register_governor(*governor); | |
255 | if (ret) { | |
256 | pr_err("Failed to register governor: '%s'", | |
257 | (*governor)->name); | |
258 | break; | |
259 | } | |
7e8ee1e9 | 260 | |
57c5b2ec DL |
261 | pr_info("Registered thermal governor '%s'", |
262 | (*governor)->name); | |
263 | } | |
7e8ee1e9 | 264 | |
57c5b2ec DL |
265 | if (ret) { |
266 | struct thermal_governor **gov; | |
7e8ee1e9 | 267 | |
57c5b2ec DL |
268 | for_each_governor_table(gov) { |
269 | if (gov == governor) | |
270 | break; | |
271 | thermal_unregister_governor(*gov); | |
272 | } | |
273 | } | |
7e8ee1e9 | 274 | |
57c5b2ec | 275 | return ret; |
7e8ee1e9 D |
276 | } |
277 | ||
8772e185 EV |
278 | /* |
279 | * Zone update section: main control loop applied to each zone while monitoring | |
280 | * | |
281 | * in polling mode. The monitoring is done using a workqueue. | |
282 | * Same update may be done on a zone by calling thermal_zone_device_update(). | |
283 | * | |
284 | * An update means: | |
285 | * - Non-critical trips will invoke the governor responsible for that zone; | |
286 | * - Hot trips will produce a notification to userspace; | |
287 | * - Critical trip point will cause a system shutdown. | |
288 | */ | |
0c01ebbf D |
289 | static void thermal_zone_device_set_polling(struct thermal_zone_device *tz, |
290 | int delay) | |
291 | { | |
292 | if (delay > 1000) | |
c2b59d27 JG |
293 | mod_delayed_work(system_freezable_power_efficient_wq, |
294 | &tz->poll_queue, | |
0c01ebbf D |
295 | round_jiffies(msecs_to_jiffies(delay))); |
296 | else if (delay) | |
c2b59d27 JG |
297 | mod_delayed_work(system_freezable_power_efficient_wq, |
298 | &tz->poll_queue, | |
0c01ebbf D |
299 | msecs_to_jiffies(delay)); |
300 | else | |
163b00cd | 301 | cancel_delayed_work(&tz->poll_queue); |
0c01ebbf D |
302 | } |
303 | ||
304 | static void monitor_thermal_zone(struct thermal_zone_device *tz) | |
305 | { | |
306 | mutex_lock(&tz->lock); | |
307 | ||
308 | if (tz->passive) | |
309 | thermal_zone_device_set_polling(tz, tz->passive_delay); | |
310 | else if (tz->polling_delay) | |
311 | thermal_zone_device_set_polling(tz, tz->polling_delay); | |
312 | else | |
313 | thermal_zone_device_set_polling(tz, 0); | |
314 | ||
315 | mutex_unlock(&tz->lock); | |
316 | } | |
317 | ||
5be52fcc | 318 | static void handle_non_critical_trips(struct thermal_zone_device *tz, int trip) |
0c01ebbf | 319 | { |
f2234bcd ZR |
320 | tz->governor ? tz->governor->throttle(tz, trip) : |
321 | def_governor->throttle(tz, trip); | |
0c01ebbf D |
322 | } |
323 | ||
ef1d87e0 K |
324 | /** |
325 | * thermal_emergency_poweroff_func - emergency poweroff work after a known delay | |
326 | * @work: work_struct associated with the emergency poweroff function | |
327 | * | |
328 | * This function is called in very critical situations to force | |
329 | * a kernel poweroff after a configurable timeout value. | |
330 | */ | |
331 | static void thermal_emergency_poweroff_func(struct work_struct *work) | |
332 | { | |
333 | /* | |
334 | * We have reached here after the emergency thermal shutdown | |
335 | * Waiting period has expired. This means orderly_poweroff has | |
336 | * not been able to shut off the system for some reason. | |
337 | * Try to shut down the system immediately using kernel_power_off | |
338 | * if populated | |
339 | */ | |
340 | WARN(1, "Attempting kernel_power_off: Temperature too high\n"); | |
341 | kernel_power_off(); | |
342 | ||
343 | /* | |
344 | * Worst of the worst case trigger emergency restart | |
345 | */ | |
346 | WARN(1, "Attempting emergency_restart: Temperature too high\n"); | |
347 | emergency_restart(); | |
348 | } | |
349 | ||
350 | static DECLARE_DELAYED_WORK(thermal_emergency_poweroff_work, | |
351 | thermal_emergency_poweroff_func); | |
352 | ||
353 | /** | |
354 | * thermal_emergency_poweroff - Trigger an emergency system poweroff | |
355 | * | |
356 | * This may be called from any critical situation to trigger a system shutdown | |
357 | * after a known period of time. By default this is not scheduled. | |
358 | */ | |
c4b379d0 | 359 | static void thermal_emergency_poweroff(void) |
ef1d87e0 K |
360 | { |
361 | int poweroff_delay_ms = CONFIG_THERMAL_EMERGENCY_POWEROFF_DELAY_MS; | |
362 | /* | |
363 | * poweroff_delay_ms must be a carefully profiled positive value. | |
364 | * Its a must for thermal_emergency_poweroff_work to be scheduled | |
365 | */ | |
366 | if (poweroff_delay_ms <= 0) | |
367 | return; | |
368 | schedule_delayed_work(&thermal_emergency_poweroff_work, | |
369 | msecs_to_jiffies(poweroff_delay_ms)); | |
370 | } | |
371 | ||
0c01ebbf | 372 | static void handle_critical_trips(struct thermal_zone_device *tz, |
eb7be329 | 373 | int trip, enum thermal_trip_type trip_type) |
0c01ebbf | 374 | { |
17e8351a | 375 | int trip_temp; |
0c01ebbf D |
376 | |
377 | tz->ops->get_trip_temp(tz, trip, &trip_temp); | |
378 | ||
379 | /* If we have not crossed the trip_temp, we do not care. */ | |
84ffe3ec | 380 | if (trip_temp <= 0 || tz->temperature < trip_temp) |
0c01ebbf D |
381 | return; |
382 | ||
208cd822 PA |
383 | trace_thermal_zone_trip(tz, trip, trip_type); |
384 | ||
0c01ebbf D |
385 | if (tz->ops->notify) |
386 | tz->ops->notify(tz, trip, trip_type); | |
387 | ||
388 | if (trip_type == THERMAL_TRIP_CRITICAL) { | |
923e0b1e | 389 | dev_emerg(&tz->device, |
039f6cf5 | 390 | "critical temperature reached (%d C), shutting down\n", |
923e0b1e | 391 | tz->temperature / 1000); |
e441fd68 K |
392 | mutex_lock(&poweroff_lock); |
393 | if (!power_off_triggered) { | |
ef1d87e0 K |
394 | /* |
395 | * Queue a backup emergency shutdown in the event of | |
396 | * orderly_poweroff failure | |
397 | */ | |
398 | thermal_emergency_poweroff(); | |
e441fd68 K |
399 | orderly_poweroff(true); |
400 | power_off_triggered = true; | |
401 | } | |
402 | mutex_unlock(&poweroff_lock); | |
0c01ebbf D |
403 | } |
404 | } | |
405 | ||
406 | static void handle_thermal_trip(struct thermal_zone_device *tz, int trip) | |
407 | { | |
408 | enum thermal_trip_type type; | |
409 | ||
81ad4276 ZR |
410 | /* Ignore disabled trip points */ |
411 | if (test_bit(trip, &tz->trips_disabled)) | |
412 | return; | |
413 | ||
0c01ebbf D |
414 | tz->ops->get_trip_type(tz, trip, &type); |
415 | ||
416 | if (type == THERMAL_TRIP_CRITICAL || type == THERMAL_TRIP_HOT) | |
417 | handle_critical_trips(tz, trip, type); | |
418 | else | |
5be52fcc | 419 | handle_non_critical_trips(tz, trip); |
0c01ebbf D |
420 | /* |
421 | * Alright, we handled this trip successfully. | |
422 | * So, start monitoring again. | |
423 | */ | |
424 | monitor_thermal_zone(tz); | |
425 | } | |
426 | ||
427 | static void update_temperature(struct thermal_zone_device *tz) | |
428 | { | |
17e8351a | 429 | int temp, ret; |
0c01ebbf | 430 | |
e6e238c3 | 431 | ret = thermal_zone_get_temp(tz, &temp); |
0c01ebbf | 432 | if (ret) { |
7e497a73 HG |
433 | if (ret != -EAGAIN) |
434 | dev_warn(&tz->device, | |
435 | "failed to read out thermal zone (%d)\n", | |
436 | ret); | |
e6e238c3 | 437 | return; |
0c01ebbf D |
438 | } |
439 | ||
e6e238c3 | 440 | mutex_lock(&tz->lock); |
0c01ebbf D |
441 | tz->last_temperature = tz->temperature; |
442 | tz->temperature = temp; | |
0c01ebbf | 443 | mutex_unlock(&tz->lock); |
06475b55 | 444 | |
100a8fdb | 445 | trace_thermal_temperature(tz); |
bb431ba2 ZR |
446 | } |
447 | ||
964f4843 | 448 | static void thermal_zone_device_init(struct thermal_zone_device *tz) |
bb431ba2 ZR |
449 | { |
450 | struct thermal_instance *pos; | |
bb431ba2 | 451 | tz->temperature = THERMAL_TEMP_INVALID; |
bb431ba2 ZR |
452 | list_for_each_entry(pos, &tz->thermal_instances, tz_node) |
453 | pos->initialized = false; | |
0c01ebbf D |
454 | } |
455 | ||
964f4843 WW |
456 | static void thermal_zone_device_reset(struct thermal_zone_device *tz) |
457 | { | |
458 | tz->passive = 0; | |
459 | thermal_zone_device_init(tz); | |
460 | } | |
461 | ||
0e70f466 SP |
462 | void thermal_zone_device_update(struct thermal_zone_device *tz, |
463 | enum thermal_notify_event event) | |
0c01ebbf D |
464 | { |
465 | int count; | |
466 | ||
ff140fea ZR |
467 | if (atomic_read(&in_suspend)) |
468 | return; | |
469 | ||
81bd4e1c EV |
470 | if (!tz->ops->get_temp) |
471 | return; | |
472 | ||
0c01ebbf D |
473 | update_temperature(tz); |
474 | ||
060c034a SH |
475 | thermal_zone_set_trips(tz); |
476 | ||
0e70f466 SP |
477 | tz->notify_event = event; |
478 | ||
0c01ebbf D |
479 | for (count = 0; count < tz->trips; count++) |
480 | handle_thermal_trip(tz, count); | |
481 | } | |
910cb1e3 | 482 | EXPORT_SYMBOL_GPL(thermal_zone_device_update); |
0c01ebbf | 483 | |
106339ab EV |
484 | /** |
485 | * thermal_notify_framework - Sensor drivers use this API to notify framework | |
486 | * @tz: thermal zone device | |
487 | * @trip: indicates which trip point has been crossed | |
488 | * | |
489 | * This function handles the trip events from sensor drivers. It starts | |
490 | * throttling the cooling devices according to the policy configured. | |
491 | * For CRITICAL and HOT trip points, this notifies the respective drivers, | |
492 | * and does actual throttling for other trip points i.e ACTIVE and PASSIVE. | |
493 | * The throttling policy is based on the configured platform data; if no | |
494 | * platform data is provided, this uses the step_wise throttling policy. | |
495 | */ | |
496 | void thermal_notify_framework(struct thermal_zone_device *tz, int trip) | |
497 | { | |
498 | handle_thermal_trip(tz, trip); | |
499 | } | |
500 | EXPORT_SYMBOL_GPL(thermal_notify_framework); | |
501 | ||
0c01ebbf D |
502 | static void thermal_zone_device_check(struct work_struct *work) |
503 | { | |
504 | struct thermal_zone_device *tz = container_of(work, struct | |
505 | thermal_zone_device, | |
506 | poll_queue.work); | |
0e70f466 | 507 | thermal_zone_device_update(tz, THERMAL_EVENT_UNSPECIFIED); |
0c01ebbf D |
508 | } |
509 | ||
712afbdf EV |
510 | /* |
511 | * Power actor section: interface to power actors to estimate power | |
512 | * | |
513 | * Set of functions used to interact to cooling devices that know | |
514 | * how to estimate their devices power consumption. | |
515 | */ | |
9f38271c | 516 | |
35b11d2e JM |
517 | /** |
518 | * power_actor_get_max_power() - get the maximum power that a cdev can consume | |
519 | * @cdev: pointer to &thermal_cooling_device | |
520 | * @tz: a valid thermal zone device pointer | |
521 | * @max_power: pointer in which to store the maximum power | |
522 | * | |
523 | * Calculate the maximum power consumption in milliwats that the | |
524 | * cooling device can currently consume and store it in @max_power. | |
525 | * | |
526 | * Return: 0 on success, -EINVAL if @cdev doesn't support the | |
527 | * power_actor API or -E* on other error. | |
528 | */ | |
529 | int power_actor_get_max_power(struct thermal_cooling_device *cdev, | |
530 | struct thermal_zone_device *tz, u32 *max_power) | |
531 | { | |
532 | if (!cdev_is_power_actor(cdev)) | |
533 | return -EINVAL; | |
534 | ||
535 | return cdev->ops->state2power(cdev, tz, 0, max_power); | |
536 | } | |
537 | ||
c973c3bc JM |
538 | /** |
539 | * power_actor_get_min_power() - get the mainimum power that a cdev can consume | |
540 | * @cdev: pointer to &thermal_cooling_device | |
541 | * @tz: a valid thermal zone device pointer | |
542 | * @min_power: pointer in which to store the minimum power | |
543 | * | |
544 | * Calculate the minimum power consumption in milliwatts that the | |
545 | * cooling device can currently consume and store it in @min_power. | |
546 | * | |
547 | * Return: 0 on success, -EINVAL if @cdev doesn't support the | |
548 | * power_actor API or -E* on other error. | |
549 | */ | |
550 | int power_actor_get_min_power(struct thermal_cooling_device *cdev, | |
551 | struct thermal_zone_device *tz, u32 *min_power) | |
552 | { | |
553 | unsigned long max_state; | |
554 | int ret; | |
555 | ||
556 | if (!cdev_is_power_actor(cdev)) | |
557 | return -EINVAL; | |
558 | ||
559 | ret = cdev->ops->get_max_state(cdev, &max_state); | |
560 | if (ret) | |
561 | return ret; | |
562 | ||
563 | return cdev->ops->state2power(cdev, tz, max_state, min_power); | |
564 | } | |
565 | ||
35b11d2e | 566 | /** |
1a7e7cc0 | 567 | * power_actor_set_power() - limit the maximum power a cooling device consumes |
35b11d2e JM |
568 | * @cdev: pointer to &thermal_cooling_device |
569 | * @instance: thermal instance to update | |
570 | * @power: the power in milliwatts | |
571 | * | |
1a7e7cc0 EV |
572 | * Set the cooling device to consume at most @power milliwatts. The limit is |
573 | * expected to be a cap at the maximum power consumption. | |
35b11d2e JM |
574 | * |
575 | * Return: 0 on success, -EINVAL if the cooling device does not | |
576 | * implement the power actor API or -E* for other failures. | |
577 | */ | |
578 | int power_actor_set_power(struct thermal_cooling_device *cdev, | |
579 | struct thermal_instance *instance, u32 power) | |
580 | { | |
581 | unsigned long state; | |
582 | int ret; | |
583 | ||
584 | if (!cdev_is_power_actor(cdev)) | |
585 | return -EINVAL; | |
586 | ||
587 | ret = cdev->ops->power2state(cdev, instance->tz, power, &state); | |
588 | if (ret) | |
589 | return ret; | |
590 | ||
591 | instance->target = state; | |
d0b7306d | 592 | mutex_lock(&cdev->lock); |
35b11d2e | 593 | cdev->updated = false; |
d0b7306d | 594 | mutex_unlock(&cdev->lock); |
35b11d2e JM |
595 | thermal_cdev_update(cdev); |
596 | ||
597 | return 0; | |
598 | } | |
599 | ||
3d0055d2 EV |
600 | void thermal_zone_device_rebind_exception(struct thermal_zone_device *tz, |
601 | const char *cdev_type, size_t size) | |
203d3d4a | 602 | { |
3d0055d2 | 603 | struct thermal_cooling_device *cdev = NULL; |
203d3d4a | 604 | |
3d0055d2 EV |
605 | mutex_lock(&thermal_list_lock); |
606 | list_for_each_entry(cdev, &thermal_cdev_list, node) { | |
607 | /* skip non matching cdevs */ | |
608 | if (strncmp(cdev_type, cdev->type, size)) | |
609 | continue; | |
610 | ||
611 | /* re binding the exception matching the type pattern */ | |
612 | thermal_zone_bind_cooling_device(tz, THERMAL_TRIPS_NONE, cdev, | |
613 | THERMAL_NO_LIMIT, | |
614 | THERMAL_NO_LIMIT, | |
615 | THERMAL_WEIGHT_DEFAULT); | |
616 | } | |
617 | mutex_unlock(&thermal_list_lock); | |
203d3d4a ZR |
618 | } |
619 | ||
3d0055d2 EV |
620 | void thermal_zone_device_unbind_exception(struct thermal_zone_device *tz, |
621 | const char *cdev_type, size_t size) | |
203d3d4a | 622 | { |
3d0055d2 | 623 | struct thermal_cooling_device *cdev = NULL; |
203d3d4a | 624 | |
3d0055d2 EV |
625 | mutex_lock(&thermal_list_lock); |
626 | list_for_each_entry(cdev, &thermal_cdev_list, node) { | |
627 | /* skip non matching cdevs */ | |
628 | if (strncmp(cdev_type, cdev->type, size)) | |
629 | continue; | |
630 | /* unbinding the exception matching the type pattern */ | |
631 | thermal_zone_unbind_cooling_device(tz, THERMAL_TRIPS_NONE, | |
632 | cdev); | |
633 | } | |
634 | mutex_unlock(&thermal_list_lock); | |
203d3d4a ZR |
635 | } |
636 | ||
81193e2e EV |
637 | /* |
638 | * Device management section: cooling devices, zones devices, and binding | |
639 | * | |
640 | * Set of functions provided by the thermal core for: | |
641 | * - cooling devices lifecycle: registration, unregistration, | |
642 | * binding, and unbinding. | |
643 | * - thermal zone devices lifecycle: registration, unregistration, | |
644 | * binding, and unbinding. | |
645 | */ | |
203d3d4a ZR |
646 | |
647 | /** | |
d2e4eb83 EV |
648 | * thermal_zone_bind_cooling_device() - bind a cooling device to a thermal zone |
649 | * @tz: pointer to struct thermal_zone_device | |
203d3d4a ZR |
650 | * @trip: indicates which trip point the cooling devices is |
651 | * associated with in this thermal zone. | |
d2e4eb83 EV |
652 | * @cdev: pointer to struct thermal_cooling_device |
653 | * @upper: the Maximum cooling state for this trip point. | |
654 | * THERMAL_NO_LIMIT means no upper limit, | |
655 | * and the cooling device can be in max_state. | |
656 | * @lower: the Minimum cooling state can be used for this trip point. | |
657 | * THERMAL_NO_LIMIT means no lower limit, | |
658 | * and the cooling device can be in cooling state 0. | |
6cd9e9f6 KS |
659 | * @weight: The weight of the cooling device to be bound to the |
660 | * thermal zone. Use THERMAL_WEIGHT_DEFAULT for the | |
661 | * default value | |
543a9561 | 662 | * |
d2e4eb83 EV |
663 | * This interface function bind a thermal cooling device to the certain trip |
664 | * point of a thermal zone device. | |
543a9561 | 665 | * This function is usually called in the thermal zone device .bind callback. |
d2e4eb83 EV |
666 | * |
667 | * Return: 0 on success, the proper error value otherwise. | |
203d3d4a ZR |
668 | */ |
669 | int thermal_zone_bind_cooling_device(struct thermal_zone_device *tz, | |
670 | int trip, | |
9d99842f | 671 | struct thermal_cooling_device *cdev, |
6cd9e9f6 KS |
672 | unsigned long upper, unsigned long lower, |
673 | unsigned int weight) | |
203d3d4a | 674 | { |
b81b6ba3 ZR |
675 | struct thermal_instance *dev; |
676 | struct thermal_instance *pos; | |
c7516709 TS |
677 | struct thermal_zone_device *pos1; |
678 | struct thermal_cooling_device *pos2; | |
74051ba5 | 679 | unsigned long max_state; |
9a3031dc | 680 | int result, ret; |
203d3d4a | 681 | |
543a9561 | 682 | if (trip >= tz->trips || (trip < 0 && trip != THERMAL_TRIPS_NONE)) |
203d3d4a ZR |
683 | return -EINVAL; |
684 | ||
c7516709 TS |
685 | list_for_each_entry(pos1, &thermal_tz_list, node) { |
686 | if (pos1 == tz) | |
687 | break; | |
688 | } | |
689 | list_for_each_entry(pos2, &thermal_cdev_list, node) { | |
690 | if (pos2 == cdev) | |
691 | break; | |
692 | } | |
693 | ||
694 | if (tz != pos1 || cdev != pos2) | |
203d3d4a ZR |
695 | return -EINVAL; |
696 | ||
9a3031dc LM |
697 | ret = cdev->ops->get_max_state(cdev, &max_state); |
698 | if (ret) | |
699 | return ret; | |
9d99842f ZR |
700 | |
701 | /* lower default 0, upper default max_state */ | |
702 | lower = lower == THERMAL_NO_LIMIT ? 0 : lower; | |
703 | upper = upper == THERMAL_NO_LIMIT ? max_state : upper; | |
704 | ||
705 | if (lower > upper || upper > max_state) | |
706 | return -EINVAL; | |
707 | ||
95e3ed15 | 708 | dev = kzalloc(sizeof(*dev), GFP_KERNEL); |
203d3d4a ZR |
709 | if (!dev) |
710 | return -ENOMEM; | |
711 | dev->tz = tz; | |
712 | dev->cdev = cdev; | |
713 | dev->trip = trip; | |
9d99842f ZR |
714 | dev->upper = upper; |
715 | dev->lower = lower; | |
ce119f83 | 716 | dev->target = THERMAL_NO_TARGET; |
6cd9e9f6 | 717 | dev->weight = weight; |
74051ba5 | 718 | |
b31ef828 MW |
719 | result = ida_simple_get(&tz->ida, 0, 0, GFP_KERNEL); |
720 | if (result < 0) | |
203d3d4a ZR |
721 | goto free_mem; |
722 | ||
b31ef828 | 723 | dev->id = result; |
203d3d4a ZR |
724 | sprintf(dev->name, "cdev%d", dev->id); |
725 | result = | |
726 | sysfs_create_link(&tz->device.kobj, &cdev->device.kobj, dev->name); | |
727 | if (result) | |
b31ef828 | 728 | goto release_ida; |
203d3d4a ZR |
729 | |
730 | sprintf(dev->attr_name, "cdev%d_trip_point", dev->id); | |
975f8c56 | 731 | sysfs_attr_init(&dev->attr.attr); |
203d3d4a ZR |
732 | dev->attr.attr.name = dev->attr_name; |
733 | dev->attr.attr.mode = 0444; | |
33e678d4 | 734 | dev->attr.show = trip_point_show; |
203d3d4a ZR |
735 | result = device_create_file(&tz->device, &dev->attr); |
736 | if (result) | |
737 | goto remove_symbol_link; | |
738 | ||
db916513 JM |
739 | sprintf(dev->weight_attr_name, "cdev%d_weight", dev->id); |
740 | sysfs_attr_init(&dev->weight_attr.attr); | |
741 | dev->weight_attr.attr.name = dev->weight_attr_name; | |
742 | dev->weight_attr.attr.mode = S_IWUSR | S_IRUGO; | |
33e678d4 VK |
743 | dev->weight_attr.show = weight_show; |
744 | dev->weight_attr.store = weight_store; | |
db916513 JM |
745 | result = device_create_file(&tz->device, &dev->weight_attr); |
746 | if (result) | |
747 | goto remove_trip_file; | |
748 | ||
203d3d4a | 749 | mutex_lock(&tz->lock); |
f4a821ce | 750 | mutex_lock(&cdev->lock); |
cddf31b3 | 751 | list_for_each_entry(pos, &tz->thermal_instances, tz_node) |
b659a30d EV |
752 | if (pos->tz == tz && pos->trip == trip && pos->cdev == cdev) { |
753 | result = -EEXIST; | |
754 | break; | |
755 | } | |
b5e4ae62 | 756 | if (!result) { |
cddf31b3 | 757 | list_add_tail(&dev->tz_node, &tz->thermal_instances); |
b5e4ae62 | 758 | list_add_tail(&dev->cdev_node, &cdev->thermal_instances); |
4511f716 | 759 | atomic_set(&tz->need_update, 1); |
b5e4ae62 | 760 | } |
f4a821ce | 761 | mutex_unlock(&cdev->lock); |
203d3d4a ZR |
762 | mutex_unlock(&tz->lock); |
763 | ||
764 | if (!result) | |
765 | return 0; | |
766 | ||
db916513 JM |
767 | device_remove_file(&tz->device, &dev->weight_attr); |
768 | remove_trip_file: | |
203d3d4a | 769 | device_remove_file(&tz->device, &dev->attr); |
caca8b80 | 770 | remove_symbol_link: |
203d3d4a | 771 | sysfs_remove_link(&tz->device.kobj, dev->name); |
b31ef828 MW |
772 | release_ida: |
773 | ida_simple_remove(&tz->ida, dev->id); | |
caca8b80 | 774 | free_mem: |
203d3d4a ZR |
775 | kfree(dev); |
776 | return result; | |
777 | } | |
910cb1e3 | 778 | EXPORT_SYMBOL_GPL(thermal_zone_bind_cooling_device); |
203d3d4a ZR |
779 | |
780 | /** | |
9892e5dc EV |
781 | * thermal_zone_unbind_cooling_device() - unbind a cooling device from a |
782 | * thermal zone. | |
783 | * @tz: pointer to a struct thermal_zone_device. | |
203d3d4a ZR |
784 | * @trip: indicates which trip point the cooling devices is |
785 | * associated with in this thermal zone. | |
9892e5dc | 786 | * @cdev: pointer to a struct thermal_cooling_device. |
543a9561 | 787 | * |
9892e5dc EV |
788 | * This interface function unbind a thermal cooling device from the certain |
789 | * trip point of a thermal zone device. | |
543a9561 | 790 | * This function is usually called in the thermal zone device .unbind callback. |
9892e5dc EV |
791 | * |
792 | * Return: 0 on success, the proper error value otherwise. | |
203d3d4a ZR |
793 | */ |
794 | int thermal_zone_unbind_cooling_device(struct thermal_zone_device *tz, | |
795 | int trip, | |
796 | struct thermal_cooling_device *cdev) | |
797 | { | |
b81b6ba3 | 798 | struct thermal_instance *pos, *next; |
203d3d4a ZR |
799 | |
800 | mutex_lock(&tz->lock); | |
f4a821ce | 801 | mutex_lock(&cdev->lock); |
cddf31b3 | 802 | list_for_each_entry_safe(pos, next, &tz->thermal_instances, tz_node) { |
543a9561 | 803 | if (pos->tz == tz && pos->trip == trip && pos->cdev == cdev) { |
cddf31b3 | 804 | list_del(&pos->tz_node); |
b5e4ae62 | 805 | list_del(&pos->cdev_node); |
f4a821ce | 806 | mutex_unlock(&cdev->lock); |
203d3d4a ZR |
807 | mutex_unlock(&tz->lock); |
808 | goto unbind; | |
809 | } | |
810 | } | |
f4a821ce | 811 | mutex_unlock(&cdev->lock); |
203d3d4a ZR |
812 | mutex_unlock(&tz->lock); |
813 | ||
814 | return -ENODEV; | |
815 | ||
caca8b80 | 816 | unbind: |
528464ea | 817 | device_remove_file(&tz->device, &pos->weight_attr); |
203d3d4a ZR |
818 | device_remove_file(&tz->device, &pos->attr); |
819 | sysfs_remove_link(&tz->device.kobj, pos->name); | |
b31ef828 | 820 | ida_simple_remove(&tz->ida, pos->id); |
203d3d4a ZR |
821 | kfree(pos); |
822 | return 0; | |
823 | } | |
910cb1e3 | 824 | EXPORT_SYMBOL_GPL(thermal_zone_unbind_cooling_device); |
203d3d4a ZR |
825 | |
826 | static void thermal_release(struct device *dev) | |
827 | { | |
828 | struct thermal_zone_device *tz; | |
829 | struct thermal_cooling_device *cdev; | |
830 | ||
caca8b80 JP |
831 | if (!strncmp(dev_name(dev), "thermal_zone", |
832 | sizeof("thermal_zone") - 1)) { | |
203d3d4a | 833 | tz = to_thermal_zone(dev); |
6a6cd25b | 834 | thermal_zone_destroy_device_groups(tz); |
203d3d4a | 835 | kfree(tz); |
b659a30d EV |
836 | } else if (!strncmp(dev_name(dev), "cooling_device", |
837 | sizeof("cooling_device") - 1)) { | |
203d3d4a ZR |
838 | cdev = to_cooling_device(dev); |
839 | kfree(cdev); | |
840 | } | |
841 | } | |
842 | ||
843 | static struct class thermal_class = { | |
844 | .name = "thermal", | |
845 | .dev_release = thermal_release, | |
846 | }; | |
847 | ||
4b0d3c2d EV |
848 | static inline |
849 | void print_bind_err_msg(struct thermal_zone_device *tz, | |
850 | struct thermal_cooling_device *cdev, int ret) | |
f502ab84 EV |
851 | { |
852 | dev_err(&tz->device, "binding zone %s with cdev %s failed:%d\n", | |
853 | tz->type, cdev->type, ret); | |
854 | } | |
855 | ||
856 | static void __bind(struct thermal_zone_device *tz, int mask, | |
857 | struct thermal_cooling_device *cdev, | |
858 | unsigned long *limits, | |
859 | unsigned int weight) | |
860 | { | |
861 | int i, ret; | |
862 | ||
863 | for (i = 0; i < tz->trips; i++) { | |
864 | if (mask & (1 << i)) { | |
865 | unsigned long upper, lower; | |
866 | ||
867 | upper = THERMAL_NO_LIMIT; | |
868 | lower = THERMAL_NO_LIMIT; | |
869 | if (limits) { | |
870 | lower = limits[i * 2]; | |
871 | upper = limits[i * 2 + 1]; | |
872 | } | |
873 | ret = thermal_zone_bind_cooling_device(tz, i, cdev, | |
874 | upper, lower, | |
875 | weight); | |
876 | if (ret) | |
877 | print_bind_err_msg(tz, cdev, ret); | |
878 | } | |
879 | } | |
880 | } | |
881 | ||
949aad83 EV |
882 | static void bind_cdev(struct thermal_cooling_device *cdev) |
883 | { | |
884 | int i, ret; | |
885 | const struct thermal_zone_params *tzp; | |
886 | struct thermal_zone_device *pos = NULL; | |
887 | ||
888 | mutex_lock(&thermal_list_lock); | |
889 | ||
890 | list_for_each_entry(pos, &thermal_tz_list, node) { | |
891 | if (!pos->tzp && !pos->ops->bind) | |
892 | continue; | |
893 | ||
894 | if (pos->ops->bind) { | |
895 | ret = pos->ops->bind(pos, cdev); | |
896 | if (ret) | |
897 | print_bind_err_msg(pos, cdev, ret); | |
898 | continue; | |
899 | } | |
900 | ||
901 | tzp = pos->tzp; | |
902 | if (!tzp || !tzp->tbp) | |
903 | continue; | |
904 | ||
905 | for (i = 0; i < tzp->num_tbps; i++) { | |
906 | if (tzp->tbp[i].cdev || !tzp->tbp[i].match) | |
907 | continue; | |
908 | if (tzp->tbp[i].match(pos, cdev)) | |
909 | continue; | |
910 | tzp->tbp[i].cdev = cdev; | |
911 | __bind(pos, tzp->tbp[i].trip_mask, cdev, | |
912 | tzp->tbp[i].binding_limits, | |
913 | tzp->tbp[i].weight); | |
914 | } | |
915 | } | |
916 | ||
917 | mutex_unlock(&thermal_list_lock); | |
918 | } | |
919 | ||
203d3d4a | 920 | /** |
a116b5d4 EV |
921 | * __thermal_cooling_device_register() - register a new thermal cooling device |
922 | * @np: a pointer to a device tree node. | |
203d3d4a ZR |
923 | * @type: the thermal cooling device type. |
924 | * @devdata: device private data. | |
925 | * @ops: standard thermal cooling devices callbacks. | |
3a6eccb3 EV |
926 | * |
927 | * This interface function adds a new thermal cooling device (fan/processor/...) | |
928 | * to /sys/class/thermal/ folder as cooling_device[0-*]. It tries to bind itself | |
929 | * to all the thermal zone devices registered at the same time. | |
a116b5d4 EV |
930 | * It also gives the opportunity to link the cooling device to a device tree |
931 | * node, so that it can be bound to a thermal zone created out of device tree. | |
3a6eccb3 EV |
932 | * |
933 | * Return: a pointer to the created struct thermal_cooling_device or an | |
934 | * ERR_PTR. Caller must check return value with IS_ERR*() helpers. | |
203d3d4a | 935 | */ |
a116b5d4 EV |
936 | static struct thermal_cooling_device * |
937 | __thermal_cooling_device_register(struct device_node *np, | |
f991de53 | 938 | const char *type, void *devdata, |
a116b5d4 | 939 | const struct thermal_cooling_device_ops *ops) |
203d3d4a ZR |
940 | { |
941 | struct thermal_cooling_device *cdev; | |
4511f716 | 942 | struct thermal_zone_device *pos = NULL; |
203d3d4a ZR |
943 | int result; |
944 | ||
204dd1d3 | 945 | if (type && strlen(type) >= THERMAL_NAME_LENGTH) |
3e6fda5c | 946 | return ERR_PTR(-EINVAL); |
203d3d4a ZR |
947 | |
948 | if (!ops || !ops->get_max_state || !ops->get_cur_state || | |
543a9561 | 949 | !ops->set_cur_state) |
3e6fda5c | 950 | return ERR_PTR(-EINVAL); |
203d3d4a | 951 | |
95e3ed15 | 952 | cdev = kzalloc(sizeof(*cdev), GFP_KERNEL); |
203d3d4a | 953 | if (!cdev) |
3e6fda5c | 954 | return ERR_PTR(-ENOMEM); |
203d3d4a | 955 | |
b31ef828 MW |
956 | result = ida_simple_get(&thermal_cdev_ida, 0, 0, GFP_KERNEL); |
957 | if (result < 0) { | |
203d3d4a | 958 | kfree(cdev); |
3e6fda5c | 959 | return ERR_PTR(result); |
203d3d4a ZR |
960 | } |
961 | ||
b31ef828 | 962 | cdev->id = result; |
c7a8b9d9 | 963 | strlcpy(cdev->type, type ? : "", sizeof(cdev->type)); |
f4a821ce | 964 | mutex_init(&cdev->lock); |
b5e4ae62 | 965 | INIT_LIST_HEAD(&cdev->thermal_instances); |
a116b5d4 | 966 | cdev->np = np; |
203d3d4a | 967 | cdev->ops = ops; |
5ca0cce5 | 968 | cdev->updated = false; |
203d3d4a ZR |
969 | cdev->device.class = &thermal_class; |
970 | cdev->devdata = devdata; | |
8ea22951 | 971 | thermal_cooling_device_setup_sysfs(cdev); |
354655ea | 972 | dev_set_name(&cdev->device, "cooling_device%d", cdev->id); |
203d3d4a ZR |
973 | result = device_register(&cdev->device); |
974 | if (result) { | |
b31ef828 | 975 | ida_simple_remove(&thermal_cdev_ida, cdev->id); |
adc8749b | 976 | put_device(&cdev->device); |
3e6fda5c | 977 | return ERR_PTR(result); |
203d3d4a ZR |
978 | } |
979 | ||
7e8ee1e9 | 980 | /* Add 'this' new cdev to the global cdev list */ |
203d3d4a ZR |
981 | mutex_lock(&thermal_list_lock); |
982 | list_add(&cdev->node, &thermal_cdev_list); | |
203d3d4a ZR |
983 | mutex_unlock(&thermal_list_lock); |
984 | ||
7e8ee1e9 D |
985 | /* Update binding information for 'this' new cdev */ |
986 | bind_cdev(cdev); | |
987 | ||
4511f716 CY |
988 | mutex_lock(&thermal_list_lock); |
989 | list_for_each_entry(pos, &thermal_tz_list, node) | |
990 | if (atomic_cmpxchg(&pos->need_update, 1, 0)) | |
0e70f466 SP |
991 | thermal_zone_device_update(pos, |
992 | THERMAL_EVENT_UNSPECIFIED); | |
4511f716 CY |
993 | mutex_unlock(&thermal_list_lock); |
994 | ||
7e8ee1e9 | 995 | return cdev; |
203d3d4a | 996 | } |
a116b5d4 EV |
997 | |
998 | /** | |
999 | * thermal_cooling_device_register() - register a new thermal cooling device | |
1000 | * @type: the thermal cooling device type. | |
1001 | * @devdata: device private data. | |
1002 | * @ops: standard thermal cooling devices callbacks. | |
1003 | * | |
1004 | * This interface function adds a new thermal cooling device (fan/processor/...) | |
1005 | * to /sys/class/thermal/ folder as cooling_device[0-*]. It tries to bind itself | |
1006 | * to all the thermal zone devices registered at the same time. | |
1007 | * | |
1008 | * Return: a pointer to the created struct thermal_cooling_device or an | |
1009 | * ERR_PTR. Caller must check return value with IS_ERR*() helpers. | |
1010 | */ | |
1011 | struct thermal_cooling_device * | |
f991de53 | 1012 | thermal_cooling_device_register(const char *type, void *devdata, |
a116b5d4 EV |
1013 | const struct thermal_cooling_device_ops *ops) |
1014 | { | |
1015 | return __thermal_cooling_device_register(NULL, type, devdata, ops); | |
1016 | } | |
910cb1e3 | 1017 | EXPORT_SYMBOL_GPL(thermal_cooling_device_register); |
203d3d4a | 1018 | |
a116b5d4 EV |
1019 | /** |
1020 | * thermal_of_cooling_device_register() - register an OF thermal cooling device | |
1021 | * @np: a pointer to a device tree node. | |
1022 | * @type: the thermal cooling device type. | |
1023 | * @devdata: device private data. | |
1024 | * @ops: standard thermal cooling devices callbacks. | |
1025 | * | |
1026 | * This function will register a cooling device with device tree node reference. | |
1027 | * This interface function adds a new thermal cooling device (fan/processor/...) | |
1028 | * to /sys/class/thermal/ folder as cooling_device[0-*]. It tries to bind itself | |
1029 | * to all the thermal zone devices registered at the same time. | |
1030 | * | |
1031 | * Return: a pointer to the created struct thermal_cooling_device or an | |
1032 | * ERR_PTR. Caller must check return value with IS_ERR*() helpers. | |
1033 | */ | |
1034 | struct thermal_cooling_device * | |
1035 | thermal_of_cooling_device_register(struct device_node *np, | |
f991de53 | 1036 | const char *type, void *devdata, |
a116b5d4 EV |
1037 | const struct thermal_cooling_device_ops *ops) |
1038 | { | |
1039 | return __thermal_cooling_device_register(np, type, devdata, ops); | |
1040 | } | |
1041 | EXPORT_SYMBOL_GPL(thermal_of_cooling_device_register); | |
1042 | ||
b4ab114c GR |
1043 | static void thermal_cooling_device_release(struct device *dev, void *res) |
1044 | { | |
1045 | thermal_cooling_device_unregister( | |
1046 | *(struct thermal_cooling_device **)res); | |
1047 | } | |
1048 | ||
1049 | /** | |
1050 | * devm_thermal_of_cooling_device_register() - register an OF thermal cooling | |
1051 | * device | |
1052 | * @dev: a valid struct device pointer of a sensor device. | |
1053 | * @np: a pointer to a device tree node. | |
1054 | * @type: the thermal cooling device type. | |
1055 | * @devdata: device private data. | |
1056 | * @ops: standard thermal cooling devices callbacks. | |
1057 | * | |
1058 | * This function will register a cooling device with device tree node reference. | |
1059 | * This interface function adds a new thermal cooling device (fan/processor/...) | |
1060 | * to /sys/class/thermal/ folder as cooling_device[0-*]. It tries to bind itself | |
1061 | * to all the thermal zone devices registered at the same time. | |
1062 | * | |
1063 | * Return: a pointer to the created struct thermal_cooling_device or an | |
1064 | * ERR_PTR. Caller must check return value with IS_ERR*() helpers. | |
1065 | */ | |
1066 | struct thermal_cooling_device * | |
1067 | devm_thermal_of_cooling_device_register(struct device *dev, | |
1068 | struct device_node *np, | |
1069 | char *type, void *devdata, | |
1070 | const struct thermal_cooling_device_ops *ops) | |
1071 | { | |
1072 | struct thermal_cooling_device **ptr, *tcd; | |
1073 | ||
1074 | ptr = devres_alloc(thermal_cooling_device_release, sizeof(*ptr), | |
1075 | GFP_KERNEL); | |
1076 | if (!ptr) | |
1077 | return ERR_PTR(-ENOMEM); | |
1078 | ||
1079 | tcd = __thermal_cooling_device_register(np, type, devdata, ops); | |
1080 | if (IS_ERR(tcd)) { | |
1081 | devres_free(ptr); | |
1082 | return tcd; | |
1083 | } | |
1084 | ||
1085 | *ptr = tcd; | |
1086 | devres_add(dev, ptr); | |
1087 | ||
1088 | return tcd; | |
1089 | } | |
1090 | EXPORT_SYMBOL_GPL(devm_thermal_of_cooling_device_register); | |
1091 | ||
f11997fa EV |
1092 | static void __unbind(struct thermal_zone_device *tz, int mask, |
1093 | struct thermal_cooling_device *cdev) | |
1094 | { | |
1095 | int i; | |
1096 | ||
1097 | for (i = 0; i < tz->trips; i++) | |
1098 | if (mask & (1 << i)) | |
1099 | thermal_zone_unbind_cooling_device(tz, i, cdev); | |
1100 | } | |
1101 | ||
203d3d4a | 1102 | /** |
38e7b549 | 1103 | * thermal_cooling_device_unregister - removes a thermal cooling device |
203d3d4a ZR |
1104 | * @cdev: the thermal cooling device to remove. |
1105 | * | |
38e7b549 EV |
1106 | * thermal_cooling_device_unregister() must be called when a registered |
1107 | * thermal cooling device is no longer needed. | |
203d3d4a | 1108 | */ |
7e8ee1e9 | 1109 | void thermal_cooling_device_unregister(struct thermal_cooling_device *cdev) |
203d3d4a | 1110 | { |
7e8ee1e9 D |
1111 | int i; |
1112 | const struct thermal_zone_params *tzp; | |
203d3d4a ZR |
1113 | struct thermal_zone_device *tz; |
1114 | struct thermal_cooling_device *pos = NULL; | |
1115 | ||
1116 | if (!cdev) | |
1117 | return; | |
1118 | ||
1119 | mutex_lock(&thermal_list_lock); | |
1120 | list_for_each_entry(pos, &thermal_cdev_list, node) | |
b659a30d EV |
1121 | if (pos == cdev) |
1122 | break; | |
203d3d4a ZR |
1123 | if (pos != cdev) { |
1124 | /* thermal cooling device not found */ | |
1125 | mutex_unlock(&thermal_list_lock); | |
1126 | return; | |
1127 | } | |
1128 | list_del(&cdev->node); | |
7e8ee1e9 D |
1129 | |
1130 | /* Unbind all thermal zones associated with 'this' cdev */ | |
203d3d4a | 1131 | list_for_each_entry(tz, &thermal_tz_list, node) { |
7e8ee1e9 D |
1132 | if (tz->ops->unbind) { |
1133 | tz->ops->unbind(tz, cdev); | |
1134 | continue; | |
1135 | } | |
1136 | ||
1137 | if (!tz->tzp || !tz->tzp->tbp) | |
203d3d4a | 1138 | continue; |
7e8ee1e9 D |
1139 | |
1140 | tzp = tz->tzp; | |
1141 | for (i = 0; i < tzp->num_tbps; i++) { | |
1142 | if (tzp->tbp[i].cdev == cdev) { | |
1143 | __unbind(tz, tzp->tbp[i].trip_mask, cdev); | |
1144 | tzp->tbp[i].cdev = NULL; | |
1145 | } | |
1146 | } | |
203d3d4a | 1147 | } |
7e8ee1e9 | 1148 | |
203d3d4a | 1149 | mutex_unlock(&thermal_list_lock); |
7e8ee1e9 | 1150 | |
b31ef828 | 1151 | ida_simple_remove(&thermal_cdev_ida, cdev->id); |
3c587768 | 1152 | device_del(&cdev->device); |
8ea22951 | 1153 | thermal_cooling_device_destroy_sysfs(cdev); |
3c587768 | 1154 | put_device(&cdev->device); |
203d3d4a | 1155 | } |
910cb1e3 | 1156 | EXPORT_SYMBOL_GPL(thermal_cooling_device_unregister); |
203d3d4a | 1157 | |
90f5b5bb | 1158 | static void bind_tz(struct thermal_zone_device *tz) |
ce119f83 | 1159 | { |
90f5b5bb EV |
1160 | int i, ret; |
1161 | struct thermal_cooling_device *pos = NULL; | |
1162 | const struct thermal_zone_params *tzp = tz->tzp; | |
ce119f83 | 1163 | |
90f5b5bb | 1164 | if (!tzp && !tz->ops->bind) |
ce119f83 | 1165 | return; |
c56f5c03 | 1166 | |
90f5b5bb | 1167 | mutex_lock(&thermal_list_lock); |
c56f5c03 | 1168 | |
90f5b5bb EV |
1169 | /* If there is ops->bind, try to use ops->bind */ |
1170 | if (tz->ops->bind) { | |
1171 | list_for_each_entry(pos, &thermal_cdev_list, node) { | |
1172 | ret = tz->ops->bind(tz, pos); | |
1173 | if (ret) | |
1174 | print_bind_err_msg(tz, pos, ret); | |
27365a6c | 1175 | } |
90f5b5bb | 1176 | goto exit; |
27365a6c | 1177 | } |
c56f5c03 | 1178 | |
90f5b5bb EV |
1179 | if (!tzp || !tzp->tbp) |
1180 | goto exit; | |
27365a6c | 1181 | |
90f5b5bb EV |
1182 | list_for_each_entry(pos, &thermal_cdev_list, node) { |
1183 | for (i = 0; i < tzp->num_tbps; i++) { | |
1184 | if (tzp->tbp[i].cdev || !tzp->tbp[i].match) | |
1185 | continue; | |
1186 | if (tzp->tbp[i].match(tz, pos)) | |
1187 | continue; | |
1188 | tzp->tbp[i].cdev = pos; | |
1189 | __bind(tz, tzp->tbp[i].trip_mask, pos, | |
1190 | tzp->tbp[i].binding_limits, | |
1191 | tzp->tbp[i].weight); | |
27365a6c | 1192 | } |
c56f5c03 | 1193 | } |
90f5b5bb EV |
1194 | exit: |
1195 | mutex_unlock(&thermal_list_lock); | |
c56f5c03 D |
1196 | } |
1197 | ||
203d3d4a | 1198 | /** |
a00e55f9 | 1199 | * thermal_zone_device_register() - register a new thermal zone device |
203d3d4a ZR |
1200 | * @type: the thermal zone device type |
1201 | * @trips: the number of trip points the thermal zone support | |
c56f5c03 | 1202 | * @mask: a bit string indicating the writeablility of trip points |
203d3d4a ZR |
1203 | * @devdata: private device data |
1204 | * @ops: standard thermal zone device callbacks | |
50125a9b | 1205 | * @tzp: thermal zone platform parameters |
b1569e99 MG |
1206 | * @passive_delay: number of milliseconds to wait between polls when |
1207 | * performing passive cooling | |
1208 | * @polling_delay: number of milliseconds to wait between polls when checking | |
1209 | * whether trip points have been crossed (0 for interrupt | |
1210 | * driven systems) | |
203d3d4a | 1211 | * |
a00e55f9 EV |
1212 | * This interface function adds a new thermal zone device (sensor) to |
1213 | * /sys/class/thermal folder as thermal_zone[0-*]. It tries to bind all the | |
1214 | * thermal cooling devices registered at the same time. | |
203d3d4a | 1215 | * thermal_zone_device_unregister() must be called when the device is no |
1b7ddb84 | 1216 | * longer needed. The passive cooling depends on the .get_trend() return value. |
a00e55f9 EV |
1217 | * |
1218 | * Return: a pointer to the created struct thermal_zone_device or an | |
1219 | * in case of error, an ERR_PTR. Caller must check return value with | |
1220 | * IS_ERR*() helpers. | |
203d3d4a | 1221 | */ |
eb7be329 EV |
1222 | struct thermal_zone_device * |
1223 | thermal_zone_device_register(const char *type, int trips, int mask, | |
1224 | void *devdata, struct thermal_zone_device_ops *ops, | |
1225 | struct thermal_zone_params *tzp, int passive_delay, | |
1226 | int polling_delay) | |
203d3d4a ZR |
1227 | { |
1228 | struct thermal_zone_device *tz; | |
03a971a2 | 1229 | enum thermal_trip_type trip_type; |
81ad4276 | 1230 | int trip_temp; |
adc8749b | 1231 | int id; |
203d3d4a ZR |
1232 | int result; |
1233 | int count; | |
e33df1d2 | 1234 | struct thermal_governor *governor; |
203d3d4a | 1235 | |
67eed44b AK |
1236 | if (!type || strlen(type) == 0) { |
1237 | pr_err("Error: No thermal zone type defined\n"); | |
54fa38cc | 1238 | return ERR_PTR(-EINVAL); |
67eed44b | 1239 | } |
54fa38cc | 1240 | |
67eed44b AK |
1241 | if (type && strlen(type) >= THERMAL_NAME_LENGTH) { |
1242 | pr_err("Error: Thermal zone name (%s) too long, should be under %d chars\n", | |
1243 | type, THERMAL_NAME_LENGTH); | |
3e6fda5c | 1244 | return ERR_PTR(-EINVAL); |
67eed44b | 1245 | } |
203d3d4a | 1246 | |
67eed44b AK |
1247 | if (trips > THERMAL_MAX_TRIPS || trips < 0 || mask >> trips) { |
1248 | pr_err("Error: Incorrect number of thermal trips\n"); | |
3e6fda5c | 1249 | return ERR_PTR(-EINVAL); |
67eed44b | 1250 | } |
203d3d4a | 1251 | |
67eed44b AK |
1252 | if (!ops) { |
1253 | pr_err("Error: Thermal zone device ops not defined\n"); | |
3e6fda5c | 1254 | return ERR_PTR(-EINVAL); |
67eed44b | 1255 | } |
203d3d4a | 1256 | |
83720d0b | 1257 | if (trips > 0 && (!ops->get_trip_type || !ops->get_trip_temp)) |
6b2aa51d EV |
1258 | return ERR_PTR(-EINVAL); |
1259 | ||
95e3ed15 | 1260 | tz = kzalloc(sizeof(*tz), GFP_KERNEL); |
203d3d4a | 1261 | if (!tz) |
3e6fda5c | 1262 | return ERR_PTR(-ENOMEM); |
203d3d4a | 1263 | |
2d374139 | 1264 | INIT_LIST_HEAD(&tz->thermal_instances); |
b31ef828 | 1265 | ida_init(&tz->ida); |
203d3d4a | 1266 | mutex_init(&tz->lock); |
adc8749b YH |
1267 | id = ida_simple_get(&thermal_tz_ida, 0, 0, GFP_KERNEL); |
1268 | if (id < 0) { | |
1269 | result = id; | |
9d9ca1f9 | 1270 | goto free_tz; |
adc8749b | 1271 | } |
203d3d4a | 1272 | |
adc8749b | 1273 | tz->id = id; |
54fa38cc | 1274 | strlcpy(tz->type, type, sizeof(tz->type)); |
203d3d4a | 1275 | tz->ops = ops; |
50125a9b | 1276 | tz->tzp = tzp; |
203d3d4a ZR |
1277 | tz->device.class = &thermal_class; |
1278 | tz->devdata = devdata; | |
1279 | tz->trips = trips; | |
b1569e99 MG |
1280 | tz->passive_delay = passive_delay; |
1281 | tz->polling_delay = polling_delay; | |
1c600861 | 1282 | |
4d0fe749 | 1283 | /* sys I/F */ |
1c600861 | 1284 | /* Add nodes that are always present via .groups */ |
4d0fe749 EV |
1285 | result = thermal_zone_create_device_groups(tz, mask); |
1286 | if (result) | |
9d9ca1f9 | 1287 | goto remove_id; |
4d0fe749 | 1288 | |
4511f716 CY |
1289 | /* A new thermal zone needs to be updated anyway. */ |
1290 | atomic_set(&tz->need_update, 1); | |
b1569e99 | 1291 | |
354655ea | 1292 | dev_set_name(&tz->device, "thermal_zone%d", tz->id); |
203d3d4a | 1293 | result = device_register(&tz->device); |
9d9ca1f9 | 1294 | if (result) |
adc8749b | 1295 | goto release_device; |
203d3d4a | 1296 | |
203d3d4a | 1297 | for (count = 0; count < trips; count++) { |
81ad4276 ZR |
1298 | if (tz->ops->get_trip_type(tz, count, &trip_type)) |
1299 | set_bit(count, &tz->trips_disabled); | |
81ad4276 ZR |
1300 | if (tz->ops->get_trip_temp(tz, count, &trip_temp)) |
1301 | set_bit(count, &tz->trips_disabled); | |
1302 | /* Check for bogus trip points */ | |
1303 | if (trip_temp == 0) | |
1304 | set_bit(count, &tz->trips_disabled); | |
203d3d4a ZR |
1305 | } |
1306 | ||
a4a15485 D |
1307 | /* Update 'this' zone's governor information */ |
1308 | mutex_lock(&thermal_governor_lock); | |
1309 | ||
1310 | if (tz->tzp) | |
e33df1d2 | 1311 | governor = __find_governor(tz->tzp->governor_name); |
a4a15485 | 1312 | else |
e33df1d2 JM |
1313 | governor = def_governor; |
1314 | ||
1315 | result = thermal_set_governor(tz, governor); | |
1316 | if (result) { | |
1317 | mutex_unlock(&thermal_governor_lock); | |
1318 | goto unregister; | |
1319 | } | |
a4a15485 D |
1320 | |
1321 | mutex_unlock(&thermal_governor_lock); | |
1322 | ||
ccba4ffd EV |
1323 | if (!tz->tzp || !tz->tzp->no_hwmon) { |
1324 | result = thermal_add_hwmon_sysfs(tz); | |
1325 | if (result) | |
1326 | goto unregister; | |
1327 | } | |
e68b16ab | 1328 | |
203d3d4a ZR |
1329 | mutex_lock(&thermal_list_lock); |
1330 | list_add_tail(&tz->node, &thermal_tz_list); | |
203d3d4a ZR |
1331 | mutex_unlock(&thermal_list_lock); |
1332 | ||
7e8ee1e9 D |
1333 | /* Bind cooling devices for this zone */ |
1334 | bind_tz(tz); | |
1335 | ||
b659a30d | 1336 | INIT_DELAYED_WORK(&tz->poll_queue, thermal_zone_device_check); |
b1569e99 | 1337 | |
bb431ba2 | 1338 | thermal_zone_device_reset(tz); |
4511f716 CY |
1339 | /* Update the new thermal zone and mark it as already updated. */ |
1340 | if (atomic_cmpxchg(&tz->need_update, 1, 0)) | |
0e70f466 | 1341 | thermal_zone_device_update(tz, THERMAL_EVENT_UNSPECIFIED); |
b1569e99 | 1342 | |
14015860 | 1343 | return tz; |
203d3d4a | 1344 | |
caca8b80 | 1345 | unregister: |
adc8749b YH |
1346 | device_del(&tz->device); |
1347 | release_device: | |
1348 | put_device(&tz->device); | |
1349 | tz = NULL; | |
9d9ca1f9 | 1350 | remove_id: |
adc8749b | 1351 | ida_simple_remove(&thermal_tz_ida, id); |
9d9ca1f9 CJ |
1352 | free_tz: |
1353 | kfree(tz); | |
1354 | return ERR_PTR(result); | |
203d3d4a | 1355 | } |
910cb1e3 | 1356 | EXPORT_SYMBOL_GPL(thermal_zone_device_register); |
203d3d4a ZR |
1357 | |
1358 | /** | |
1359 | * thermal_device_unregister - removes the registered thermal zone device | |
203d3d4a ZR |
1360 | * @tz: the thermal zone device to remove |
1361 | */ | |
1362 | void thermal_zone_device_unregister(struct thermal_zone_device *tz) | |
1363 | { | |
7e8ee1e9 D |
1364 | int i; |
1365 | const struct thermal_zone_params *tzp; | |
203d3d4a ZR |
1366 | struct thermal_cooling_device *cdev; |
1367 | struct thermal_zone_device *pos = NULL; | |
203d3d4a ZR |
1368 | |
1369 | if (!tz) | |
1370 | return; | |
1371 | ||
7e8ee1e9 D |
1372 | tzp = tz->tzp; |
1373 | ||
203d3d4a ZR |
1374 | mutex_lock(&thermal_list_lock); |
1375 | list_for_each_entry(pos, &thermal_tz_list, node) | |
b659a30d EV |
1376 | if (pos == tz) |
1377 | break; | |
203d3d4a ZR |
1378 | if (pos != tz) { |
1379 | /* thermal zone device not found */ | |
1380 | mutex_unlock(&thermal_list_lock); | |
1381 | return; | |
1382 | } | |
1383 | list_del(&tz->node); | |
7e8ee1e9 D |
1384 | |
1385 | /* Unbind all cdevs associated with 'this' thermal zone */ | |
1386 | list_for_each_entry(cdev, &thermal_cdev_list, node) { | |
1387 | if (tz->ops->unbind) { | |
1388 | tz->ops->unbind(tz, cdev); | |
1389 | continue; | |
1390 | } | |
1391 | ||
1392 | if (!tzp || !tzp->tbp) | |
1393 | break; | |
1394 | ||
1395 | for (i = 0; i < tzp->num_tbps; i++) { | |
1396 | if (tzp->tbp[i].cdev == cdev) { | |
1397 | __unbind(tz, tzp->tbp[i].trip_mask, cdev); | |
1398 | tzp->tbp[i].cdev = NULL; | |
1399 | } | |
1400 | } | |
1401 | } | |
1402 | ||
203d3d4a ZR |
1403 | mutex_unlock(&thermal_list_lock); |
1404 | ||
163b00cd | 1405 | cancel_delayed_work_sync(&tz->poll_queue); |
b1569e99 | 1406 | |
e33df1d2 | 1407 | thermal_set_governor(tz, NULL); |
203d3d4a | 1408 | |
e68b16ab | 1409 | thermal_remove_hwmon_sysfs(tz); |
b31ef828 MW |
1410 | ida_simple_remove(&thermal_tz_ida, tz->id); |
1411 | ida_destroy(&tz->ida); | |
203d3d4a ZR |
1412 | mutex_destroy(&tz->lock); |
1413 | device_unregister(&tz->device); | |
203d3d4a | 1414 | } |
910cb1e3 | 1415 | EXPORT_SYMBOL_GPL(thermal_zone_device_unregister); |
203d3d4a | 1416 | |
63c4d919 EV |
1417 | /** |
1418 | * thermal_zone_get_zone_by_name() - search for a zone and returns its ref | |
1419 | * @name: thermal zone name to fetch the temperature | |
1420 | * | |
1421 | * When only one zone is found with the passed name, returns a reference to it. | |
1422 | * | |
1423 | * Return: On success returns a reference to an unique thermal zone with | |
1424 | * matching name equals to @name, an ERR_PTR otherwise (-EINVAL for invalid | |
1425 | * paramenters, -ENODEV for not found and -EEXIST for multiple matches). | |
1426 | */ | |
1427 | struct thermal_zone_device *thermal_zone_get_zone_by_name(const char *name) | |
1428 | { | |
1429 | struct thermal_zone_device *pos = NULL, *ref = ERR_PTR(-EINVAL); | |
1430 | unsigned int found = 0; | |
1431 | ||
1432 | if (!name) | |
1433 | goto exit; | |
1434 | ||
1435 | mutex_lock(&thermal_list_lock); | |
1436 | list_for_each_entry(pos, &thermal_tz_list, node) | |
484ac2f3 | 1437 | if (!strncasecmp(name, pos->type, THERMAL_NAME_LENGTH)) { |
63c4d919 EV |
1438 | found++; |
1439 | ref = pos; | |
1440 | } | |
1441 | mutex_unlock(&thermal_list_lock); | |
1442 | ||
1443 | /* nothing has been found, thus an error code for it */ | |
1444 | if (found == 0) | |
1445 | ref = ERR_PTR(-ENODEV); | |
1446 | else if (found > 1) | |
1447 | /* Success only when an unique zone is found */ | |
1448 | ref = ERR_PTR(-EEXIST); | |
1449 | ||
1450 | exit: | |
1451 | return ref; | |
1452 | } | |
1453 | EXPORT_SYMBOL_GPL(thermal_zone_get_zone_by_name); | |
1454 | ||
ff140fea | 1455 | static int thermal_pm_notify(struct notifier_block *nb, |
eb7be329 | 1456 | unsigned long mode, void *_unused) |
ff140fea ZR |
1457 | { |
1458 | struct thermal_zone_device *tz; | |
1459 | ||
1460 | switch (mode) { | |
1461 | case PM_HIBERNATION_PREPARE: | |
1462 | case PM_RESTORE_PREPARE: | |
1463 | case PM_SUSPEND_PREPARE: | |
1464 | atomic_set(&in_suspend, 1); | |
1465 | break; | |
1466 | case PM_POST_HIBERNATION: | |
1467 | case PM_POST_RESTORE: | |
1468 | case PM_POST_SUSPEND: | |
1469 | atomic_set(&in_suspend, 0); | |
1470 | list_for_each_entry(tz, &thermal_tz_list, node) { | |
1ee14820 | 1471 | if (tz->mode == THERMAL_DEVICE_DISABLED) |
ff54bbd1 WW |
1472 | continue; |
1473 | ||
964f4843 | 1474 | thermal_zone_device_init(tz); |
0e70f466 SP |
1475 | thermal_zone_device_update(tz, |
1476 | THERMAL_EVENT_UNSPECIFIED); | |
ff140fea ZR |
1477 | } |
1478 | break; | |
1479 | default: | |
1480 | break; | |
1481 | } | |
1482 | return 0; | |
1483 | } | |
1484 | ||
1485 | static struct notifier_block thermal_pm_nb = { | |
1486 | .notifier_call = thermal_pm_notify, | |
1487 | }; | |
1488 | ||
203d3d4a ZR |
1489 | static int __init thermal_init(void) |
1490 | { | |
80a26a5c ZR |
1491 | int result; |
1492 | ||
e441fd68 | 1493 | mutex_init(&poweroff_lock); |
80a26a5c ZR |
1494 | result = thermal_register_governors(); |
1495 | if (result) | |
1496 | goto error; | |
203d3d4a ZR |
1497 | |
1498 | result = class_register(&thermal_class); | |
80a26a5c ZR |
1499 | if (result) |
1500 | goto unregister_governors; | |
1501 | ||
4e5e4705 EV |
1502 | result = of_parse_thermal_zones(); |
1503 | if (result) | |
f96c8e50 | 1504 | goto unregister_class; |
4e5e4705 | 1505 | |
ff140fea ZR |
1506 | result = register_pm_notifier(&thermal_pm_nb); |
1507 | if (result) | |
1508 | pr_warn("Thermal: Can not register suspend notifier, return %d\n", | |
1509 | result); | |
1510 | ||
80a26a5c ZR |
1511 | return 0; |
1512 | ||
80a26a5c ZR |
1513 | unregister_class: |
1514 | class_unregister(&thermal_class); | |
9d367e5e LH |
1515 | unregister_governors: |
1516 | thermal_unregister_governors(); | |
80a26a5c | 1517 | error: |
b31ef828 MW |
1518 | ida_destroy(&thermal_tz_ida); |
1519 | ida_destroy(&thermal_cdev_ida); | |
80a26a5c ZR |
1520 | mutex_destroy(&thermal_list_lock); |
1521 | mutex_destroy(&thermal_governor_lock); | |
e441fd68 | 1522 | mutex_destroy(&poweroff_lock); |
203d3d4a ZR |
1523 | return result; |
1524 | } | |
ae16a688 | 1525 | core_initcall(thermal_init); |