Commit | Line | Data |
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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 | |
55cdf0a2 DL |
218 | thermal_notify_tz_gov_change(tz->id, policy); |
219 | ||
1b4f4849 | 220 | return ret; |
7e8ee1e9 D |
221 | } |
222 | ||
1b4f4849 | 223 | int thermal_build_list_of_policies(char *buf) |
7e8ee1e9 | 224 | { |
1b4f4849 EV |
225 | struct thermal_governor *pos; |
226 | ssize_t count = 0; | |
227 | ssize_t size = PAGE_SIZE; | |
7e8ee1e9 | 228 | |
1b4f4849 | 229 | mutex_lock(&thermal_governor_lock); |
a8892d83 | 230 | |
1b4f4849 EV |
231 | list_for_each_entry(pos, &thermal_governor_list, governor_list) { |
232 | size = PAGE_SIZE - count; | |
233 | count += scnprintf(buf + count, size, "%s ", pos->name); | |
7e8ee1e9 | 234 | } |
1b4f4849 | 235 | count += scnprintf(buf + count, size, "\n"); |
7e8ee1e9 | 236 | |
1b4f4849 | 237 | mutex_unlock(&thermal_governor_lock); |
7e8ee1e9 | 238 | |
1b4f4849 | 239 | return count; |
7e8ee1e9 D |
240 | } |
241 | ||
57c5b2ec | 242 | static void __init thermal_unregister_governors(void) |
7e8ee1e9 | 243 | { |
57c5b2ec DL |
244 | struct thermal_governor **governor; |
245 | ||
246 | for_each_governor_table(governor) | |
247 | thermal_unregister_governor(*governor); | |
248 | } | |
7e8ee1e9 | 249 | |
57c5b2ec DL |
250 | static int __init thermal_register_governors(void) |
251 | { | |
252 | int ret = 0; | |
253 | struct thermal_governor **governor; | |
7e8ee1e9 | 254 | |
57c5b2ec DL |
255 | for_each_governor_table(governor) { |
256 | ret = thermal_register_governor(*governor); | |
257 | if (ret) { | |
258 | pr_err("Failed to register governor: '%s'", | |
259 | (*governor)->name); | |
260 | break; | |
261 | } | |
7e8ee1e9 | 262 | |
57c5b2ec DL |
263 | pr_info("Registered thermal governor '%s'", |
264 | (*governor)->name); | |
265 | } | |
7e8ee1e9 | 266 | |
57c5b2ec DL |
267 | if (ret) { |
268 | struct thermal_governor **gov; | |
7e8ee1e9 | 269 | |
57c5b2ec DL |
270 | for_each_governor_table(gov) { |
271 | if (gov == governor) | |
272 | break; | |
273 | thermal_unregister_governor(*gov); | |
274 | } | |
275 | } | |
7e8ee1e9 | 276 | |
57c5b2ec | 277 | return ret; |
7e8ee1e9 D |
278 | } |
279 | ||
8772e185 EV |
280 | /* |
281 | * Zone update section: main control loop applied to each zone while monitoring | |
282 | * | |
283 | * in polling mode. The monitoring is done using a workqueue. | |
284 | * Same update may be done on a zone by calling thermal_zone_device_update(). | |
285 | * | |
286 | * An update means: | |
287 | * - Non-critical trips will invoke the governor responsible for that zone; | |
288 | * - Hot trips will produce a notification to userspace; | |
289 | * - Critical trip point will cause a system shutdown. | |
290 | */ | |
0c01ebbf D |
291 | static void thermal_zone_device_set_polling(struct thermal_zone_device *tz, |
292 | int delay) | |
293 | { | |
294 | if (delay > 1000) | |
c2b59d27 JG |
295 | mod_delayed_work(system_freezable_power_efficient_wq, |
296 | &tz->poll_queue, | |
0c01ebbf D |
297 | round_jiffies(msecs_to_jiffies(delay))); |
298 | else if (delay) | |
c2b59d27 JG |
299 | mod_delayed_work(system_freezable_power_efficient_wq, |
300 | &tz->poll_queue, | |
0c01ebbf D |
301 | msecs_to_jiffies(delay)); |
302 | else | |
163b00cd | 303 | cancel_delayed_work(&tz->poll_queue); |
0c01ebbf D |
304 | } |
305 | ||
b56bdff7 AP |
306 | static inline bool should_stop_polling(struct thermal_zone_device *tz) |
307 | { | |
308 | return !thermal_zone_device_is_enabled(tz); | |
309 | } | |
310 | ||
0c01ebbf D |
311 | static void monitor_thermal_zone(struct thermal_zone_device *tz) |
312 | { | |
b56bdff7 AP |
313 | bool stop; |
314 | ||
315 | stop = should_stop_polling(tz); | |
316 | ||
0c01ebbf D |
317 | mutex_lock(&tz->lock); |
318 | ||
b56bdff7 | 319 | if (!stop && tz->passive) |
0c01ebbf | 320 | thermal_zone_device_set_polling(tz, tz->passive_delay); |
b56bdff7 | 321 | else if (!stop && tz->polling_delay) |
0c01ebbf D |
322 | thermal_zone_device_set_polling(tz, tz->polling_delay); |
323 | else | |
324 | thermal_zone_device_set_polling(tz, 0); | |
325 | ||
326 | mutex_unlock(&tz->lock); | |
327 | } | |
328 | ||
5be52fcc | 329 | static void handle_non_critical_trips(struct thermal_zone_device *tz, int trip) |
0c01ebbf | 330 | { |
f2234bcd ZR |
331 | tz->governor ? tz->governor->throttle(tz, trip) : |
332 | def_governor->throttle(tz, trip); | |
0c01ebbf D |
333 | } |
334 | ||
ef1d87e0 K |
335 | /** |
336 | * thermal_emergency_poweroff_func - emergency poweroff work after a known delay | |
337 | * @work: work_struct associated with the emergency poweroff function | |
338 | * | |
339 | * This function is called in very critical situations to force | |
340 | * a kernel poweroff after a configurable timeout value. | |
341 | */ | |
342 | static void thermal_emergency_poweroff_func(struct work_struct *work) | |
343 | { | |
344 | /* | |
345 | * We have reached here after the emergency thermal shutdown | |
346 | * Waiting period has expired. This means orderly_poweroff has | |
347 | * not been able to shut off the system for some reason. | |
348 | * Try to shut down the system immediately using kernel_power_off | |
349 | * if populated | |
350 | */ | |
351 | WARN(1, "Attempting kernel_power_off: Temperature too high\n"); | |
352 | kernel_power_off(); | |
353 | ||
354 | /* | |
355 | * Worst of the worst case trigger emergency restart | |
356 | */ | |
357 | WARN(1, "Attempting emergency_restart: Temperature too high\n"); | |
358 | emergency_restart(); | |
359 | } | |
360 | ||
361 | static DECLARE_DELAYED_WORK(thermal_emergency_poweroff_work, | |
362 | thermal_emergency_poweroff_func); | |
363 | ||
364 | /** | |
365 | * thermal_emergency_poweroff - Trigger an emergency system poweroff | |
366 | * | |
367 | * This may be called from any critical situation to trigger a system shutdown | |
368 | * after a known period of time. By default this is not scheduled. | |
369 | */ | |
c4b379d0 | 370 | static void thermal_emergency_poweroff(void) |
ef1d87e0 K |
371 | { |
372 | int poweroff_delay_ms = CONFIG_THERMAL_EMERGENCY_POWEROFF_DELAY_MS; | |
373 | /* | |
374 | * poweroff_delay_ms must be a carefully profiled positive value. | |
375 | * Its a must for thermal_emergency_poweroff_work to be scheduled | |
376 | */ | |
377 | if (poweroff_delay_ms <= 0) | |
378 | return; | |
379 | schedule_delayed_work(&thermal_emergency_poweroff_work, | |
380 | msecs_to_jiffies(poweroff_delay_ms)); | |
381 | } | |
382 | ||
0c01ebbf | 383 | static void handle_critical_trips(struct thermal_zone_device *tz, |
eb7be329 | 384 | int trip, enum thermal_trip_type trip_type) |
0c01ebbf | 385 | { |
17e8351a | 386 | int trip_temp; |
0c01ebbf D |
387 | |
388 | tz->ops->get_trip_temp(tz, trip, &trip_temp); | |
389 | ||
390 | /* If we have not crossed the trip_temp, we do not care. */ | |
84ffe3ec | 391 | if (trip_temp <= 0 || tz->temperature < trip_temp) |
0c01ebbf D |
392 | return; |
393 | ||
208cd822 PA |
394 | trace_thermal_zone_trip(tz, trip, trip_type); |
395 | ||
0c01ebbf D |
396 | if (tz->ops->notify) |
397 | tz->ops->notify(tz, trip, trip_type); | |
398 | ||
399 | if (trip_type == THERMAL_TRIP_CRITICAL) { | |
923e0b1e | 400 | dev_emerg(&tz->device, |
039f6cf5 | 401 | "critical temperature reached (%d C), shutting down\n", |
923e0b1e | 402 | tz->temperature / 1000); |
e441fd68 K |
403 | mutex_lock(&poweroff_lock); |
404 | if (!power_off_triggered) { | |
ef1d87e0 K |
405 | /* |
406 | * Queue a backup emergency shutdown in the event of | |
407 | * orderly_poweroff failure | |
408 | */ | |
409 | thermal_emergency_poweroff(); | |
e441fd68 K |
410 | orderly_poweroff(true); |
411 | power_off_triggered = true; | |
412 | } | |
413 | mutex_unlock(&poweroff_lock); | |
0c01ebbf D |
414 | } |
415 | } | |
416 | ||
417 | static void handle_thermal_trip(struct thermal_zone_device *tz, int trip) | |
418 | { | |
419 | enum thermal_trip_type type; | |
55cdf0a2 | 420 | int trip_temp, hyst = 0; |
0c01ebbf | 421 | |
81ad4276 ZR |
422 | /* Ignore disabled trip points */ |
423 | if (test_bit(trip, &tz->trips_disabled)) | |
424 | return; | |
425 | ||
55cdf0a2 | 426 | tz->ops->get_trip_temp(tz, trip, &trip_temp); |
0c01ebbf | 427 | tz->ops->get_trip_type(tz, trip, &type); |
55cdf0a2 DL |
428 | if (tz->ops->get_trip_hyst) |
429 | tz->ops->get_trip_hyst(tz, trip, &hyst); | |
430 | ||
431 | if (tz->last_temperature != THERMAL_TEMP_INVALID) { | |
432 | if (tz->last_temperature < trip_temp && | |
433 | tz->temperature >= trip_temp) | |
434 | thermal_notify_tz_trip_up(tz->id, trip); | |
435 | if (tz->last_temperature >= trip_temp && | |
436 | tz->temperature < (trip_temp - hyst)) | |
437 | thermal_notify_tz_trip_down(tz->id, trip); | |
438 | } | |
0c01ebbf D |
439 | |
440 | if (type == THERMAL_TRIP_CRITICAL || type == THERMAL_TRIP_HOT) | |
441 | handle_critical_trips(tz, trip, type); | |
442 | else | |
5be52fcc | 443 | handle_non_critical_trips(tz, trip); |
0c01ebbf D |
444 | /* |
445 | * Alright, we handled this trip successfully. | |
446 | * So, start monitoring again. | |
447 | */ | |
448 | monitor_thermal_zone(tz); | |
449 | } | |
450 | ||
451 | static void update_temperature(struct thermal_zone_device *tz) | |
452 | { | |
17e8351a | 453 | int temp, ret; |
0c01ebbf | 454 | |
e6e238c3 | 455 | ret = thermal_zone_get_temp(tz, &temp); |
0c01ebbf | 456 | if (ret) { |
7e497a73 HG |
457 | if (ret != -EAGAIN) |
458 | dev_warn(&tz->device, | |
459 | "failed to read out thermal zone (%d)\n", | |
460 | ret); | |
e6e238c3 | 461 | return; |
0c01ebbf D |
462 | } |
463 | ||
e6e238c3 | 464 | mutex_lock(&tz->lock); |
0c01ebbf D |
465 | tz->last_temperature = tz->temperature; |
466 | tz->temperature = temp; | |
0c01ebbf | 467 | mutex_unlock(&tz->lock); |
06475b55 | 468 | |
100a8fdb | 469 | trace_thermal_temperature(tz); |
55cdf0a2 DL |
470 | |
471 | thermal_genl_sampling_temp(tz->id, temp); | |
bb431ba2 ZR |
472 | } |
473 | ||
964f4843 | 474 | static void thermal_zone_device_init(struct thermal_zone_device *tz) |
bb431ba2 ZR |
475 | { |
476 | struct thermal_instance *pos; | |
bb431ba2 | 477 | tz->temperature = THERMAL_TEMP_INVALID; |
bb431ba2 ZR |
478 | list_for_each_entry(pos, &tz->thermal_instances, tz_node) |
479 | pos->initialized = false; | |
0c01ebbf D |
480 | } |
481 | ||
964f4843 WW |
482 | static void thermal_zone_device_reset(struct thermal_zone_device *tz) |
483 | { | |
484 | tz->passive = 0; | |
485 | thermal_zone_device_init(tz); | |
486 | } | |
487 | ||
ac5d9ecc AP |
488 | static int thermal_zone_device_set_mode(struct thermal_zone_device *tz, |
489 | enum thermal_device_mode mode) | |
490 | { | |
491 | int ret = 0; | |
492 | ||
493 | mutex_lock(&tz->lock); | |
494 | ||
495 | /* do nothing if mode isn't changing */ | |
496 | if (mode == tz->mode) { | |
497 | mutex_unlock(&tz->lock); | |
498 | ||
499 | return ret; | |
500 | } | |
501 | ||
f5e50bf4 AP |
502 | if (tz->ops->change_mode) |
503 | ret = tz->ops->change_mode(tz, mode); | |
ac5d9ecc AP |
504 | |
505 | if (!ret) | |
506 | tz->mode = mode; | |
507 | ||
508 | mutex_unlock(&tz->lock); | |
509 | ||
510 | thermal_zone_device_update(tz, THERMAL_EVENT_UNSPECIFIED); | |
511 | ||
512 | return ret; | |
513 | } | |
514 | ||
515 | int thermal_zone_device_enable(struct thermal_zone_device *tz) | |
516 | { | |
517 | return thermal_zone_device_set_mode(tz, THERMAL_DEVICE_ENABLED); | |
518 | } | |
519 | EXPORT_SYMBOL_GPL(thermal_zone_device_enable); | |
520 | ||
521 | int thermal_zone_device_disable(struct thermal_zone_device *tz) | |
522 | { | |
523 | return thermal_zone_device_set_mode(tz, THERMAL_DEVICE_DISABLED); | |
524 | } | |
525 | EXPORT_SYMBOL_GPL(thermal_zone_device_disable); | |
526 | ||
527 | int thermal_zone_device_is_enabled(struct thermal_zone_device *tz) | |
528 | { | |
529 | enum thermal_device_mode mode; | |
530 | ||
531 | mutex_lock(&tz->lock); | |
532 | ||
533 | mode = tz->mode; | |
534 | ||
535 | mutex_unlock(&tz->lock); | |
536 | ||
537 | return mode == THERMAL_DEVICE_ENABLED; | |
538 | } | |
ac5d9ecc | 539 | |
0e70f466 SP |
540 | void thermal_zone_device_update(struct thermal_zone_device *tz, |
541 | enum thermal_notify_event event) | |
0c01ebbf D |
542 | { |
543 | int count; | |
544 | ||
b56bdff7 AP |
545 | if (should_stop_polling(tz)) |
546 | return; | |
547 | ||
ff140fea ZR |
548 | if (atomic_read(&in_suspend)) |
549 | return; | |
550 | ||
81bd4e1c EV |
551 | if (!tz->ops->get_temp) |
552 | return; | |
553 | ||
0c01ebbf D |
554 | update_temperature(tz); |
555 | ||
060c034a SH |
556 | thermal_zone_set_trips(tz); |
557 | ||
0e70f466 SP |
558 | tz->notify_event = event; |
559 | ||
0c01ebbf D |
560 | for (count = 0; count < tz->trips; count++) |
561 | handle_thermal_trip(tz, count); | |
562 | } | |
910cb1e3 | 563 | EXPORT_SYMBOL_GPL(thermal_zone_device_update); |
0c01ebbf | 564 | |
106339ab EV |
565 | /** |
566 | * thermal_notify_framework - Sensor drivers use this API to notify framework | |
567 | * @tz: thermal zone device | |
568 | * @trip: indicates which trip point has been crossed | |
569 | * | |
570 | * This function handles the trip events from sensor drivers. It starts | |
571 | * throttling the cooling devices according to the policy configured. | |
572 | * For CRITICAL and HOT trip points, this notifies the respective drivers, | |
573 | * and does actual throttling for other trip points i.e ACTIVE and PASSIVE. | |
574 | * The throttling policy is based on the configured platform data; if no | |
575 | * platform data is provided, this uses the step_wise throttling policy. | |
576 | */ | |
577 | void thermal_notify_framework(struct thermal_zone_device *tz, int trip) | |
578 | { | |
579 | handle_thermal_trip(tz, trip); | |
580 | } | |
581 | EXPORT_SYMBOL_GPL(thermal_notify_framework); | |
582 | ||
0c01ebbf D |
583 | static void thermal_zone_device_check(struct work_struct *work) |
584 | { | |
585 | struct thermal_zone_device *tz = container_of(work, struct | |
586 | thermal_zone_device, | |
587 | poll_queue.work); | |
0e70f466 | 588 | thermal_zone_device_update(tz, THERMAL_EVENT_UNSPECIFIED); |
0c01ebbf D |
589 | } |
590 | ||
712afbdf EV |
591 | /* |
592 | * Power actor section: interface to power actors to estimate power | |
593 | * | |
594 | * Set of functions used to interact to cooling devices that know | |
595 | * how to estimate their devices power consumption. | |
596 | */ | |
9f38271c | 597 | |
35b11d2e JM |
598 | /** |
599 | * power_actor_get_max_power() - get the maximum power that a cdev can consume | |
600 | * @cdev: pointer to &thermal_cooling_device | |
601 | * @tz: a valid thermal zone device pointer | |
602 | * @max_power: pointer in which to store the maximum power | |
603 | * | |
604 | * Calculate the maximum power consumption in milliwats that the | |
605 | * cooling device can currently consume and store it in @max_power. | |
606 | * | |
607 | * Return: 0 on success, -EINVAL if @cdev doesn't support the | |
608 | * power_actor API or -E* on other error. | |
609 | */ | |
610 | int power_actor_get_max_power(struct thermal_cooling_device *cdev, | |
611 | struct thermal_zone_device *tz, u32 *max_power) | |
612 | { | |
613 | if (!cdev_is_power_actor(cdev)) | |
614 | return -EINVAL; | |
615 | ||
616 | return cdev->ops->state2power(cdev, tz, 0, max_power); | |
617 | } | |
618 | ||
c973c3bc JM |
619 | /** |
620 | * power_actor_get_min_power() - get the mainimum power that a cdev can consume | |
621 | * @cdev: pointer to &thermal_cooling_device | |
622 | * @tz: a valid thermal zone device pointer | |
623 | * @min_power: pointer in which to store the minimum power | |
624 | * | |
625 | * Calculate the minimum power consumption in milliwatts that the | |
626 | * cooling device can currently consume and store it in @min_power. | |
627 | * | |
628 | * Return: 0 on success, -EINVAL if @cdev doesn't support the | |
629 | * power_actor API or -E* on other error. | |
630 | */ | |
631 | int power_actor_get_min_power(struct thermal_cooling_device *cdev, | |
632 | struct thermal_zone_device *tz, u32 *min_power) | |
633 | { | |
634 | unsigned long max_state; | |
635 | int ret; | |
636 | ||
637 | if (!cdev_is_power_actor(cdev)) | |
638 | return -EINVAL; | |
639 | ||
640 | ret = cdev->ops->get_max_state(cdev, &max_state); | |
641 | if (ret) | |
642 | return ret; | |
643 | ||
644 | return cdev->ops->state2power(cdev, tz, max_state, min_power); | |
645 | } | |
646 | ||
35b11d2e | 647 | /** |
1a7e7cc0 | 648 | * power_actor_set_power() - limit the maximum power a cooling device consumes |
35b11d2e JM |
649 | * @cdev: pointer to &thermal_cooling_device |
650 | * @instance: thermal instance to update | |
651 | * @power: the power in milliwatts | |
652 | * | |
1a7e7cc0 EV |
653 | * Set the cooling device to consume at most @power milliwatts. The limit is |
654 | * expected to be a cap at the maximum power consumption. | |
35b11d2e JM |
655 | * |
656 | * Return: 0 on success, -EINVAL if the cooling device does not | |
657 | * implement the power actor API or -E* for other failures. | |
658 | */ | |
659 | int power_actor_set_power(struct thermal_cooling_device *cdev, | |
660 | struct thermal_instance *instance, u32 power) | |
661 | { | |
662 | unsigned long state; | |
663 | int ret; | |
664 | ||
665 | if (!cdev_is_power_actor(cdev)) | |
666 | return -EINVAL; | |
667 | ||
668 | ret = cdev->ops->power2state(cdev, instance->tz, power, &state); | |
669 | if (ret) | |
670 | return ret; | |
671 | ||
672 | instance->target = state; | |
d0b7306d | 673 | mutex_lock(&cdev->lock); |
35b11d2e | 674 | cdev->updated = false; |
d0b7306d | 675 | mutex_unlock(&cdev->lock); |
35b11d2e JM |
676 | thermal_cdev_update(cdev); |
677 | ||
678 | return 0; | |
679 | } | |
680 | ||
3d0055d2 EV |
681 | void thermal_zone_device_rebind_exception(struct thermal_zone_device *tz, |
682 | const char *cdev_type, size_t size) | |
203d3d4a | 683 | { |
3d0055d2 | 684 | struct thermal_cooling_device *cdev = NULL; |
203d3d4a | 685 | |
3d0055d2 EV |
686 | mutex_lock(&thermal_list_lock); |
687 | list_for_each_entry(cdev, &thermal_cdev_list, node) { | |
688 | /* skip non matching cdevs */ | |
689 | if (strncmp(cdev_type, cdev->type, size)) | |
690 | continue; | |
691 | ||
692 | /* re binding the exception matching the type pattern */ | |
693 | thermal_zone_bind_cooling_device(tz, THERMAL_TRIPS_NONE, cdev, | |
694 | THERMAL_NO_LIMIT, | |
695 | THERMAL_NO_LIMIT, | |
696 | THERMAL_WEIGHT_DEFAULT); | |
697 | } | |
698 | mutex_unlock(&thermal_list_lock); | |
203d3d4a ZR |
699 | } |
700 | ||
3d44a509 DL |
701 | int for_each_thermal_governor(int (*cb)(struct thermal_governor *, void *), |
702 | void *data) | |
703 | { | |
704 | struct thermal_governor *gov; | |
705 | int ret = 0; | |
706 | ||
707 | mutex_lock(&thermal_governor_lock); | |
708 | list_for_each_entry(gov, &thermal_governor_list, governor_list) { | |
709 | ret = cb(gov, data); | |
710 | if (ret) | |
711 | break; | |
712 | } | |
713 | mutex_unlock(&thermal_governor_lock); | |
714 | ||
715 | return ret; | |
716 | } | |
717 | ||
718 | int for_each_thermal_cooling_device(int (*cb)(struct thermal_cooling_device *, | |
719 | void *), void *data) | |
720 | { | |
721 | struct thermal_cooling_device *cdev; | |
722 | int ret = 0; | |
723 | ||
724 | mutex_lock(&thermal_list_lock); | |
725 | list_for_each_entry(cdev, &thermal_cdev_list, node) { | |
726 | ret = cb(cdev, data); | |
727 | if (ret) | |
728 | break; | |
729 | } | |
730 | mutex_unlock(&thermal_list_lock); | |
731 | ||
732 | return ret; | |
733 | } | |
734 | ||
735 | int for_each_thermal_zone(int (*cb)(struct thermal_zone_device *, void *), | |
736 | void *data) | |
737 | { | |
738 | struct thermal_zone_device *tz; | |
739 | int ret = 0; | |
740 | ||
741 | mutex_lock(&thermal_list_lock); | |
742 | list_for_each_entry(tz, &thermal_tz_list, node) { | |
743 | ret = cb(tz, data); | |
744 | if (ret) | |
745 | break; | |
746 | } | |
747 | mutex_unlock(&thermal_list_lock); | |
748 | ||
749 | return ret; | |
750 | } | |
751 | ||
329b064f DL |
752 | struct thermal_zone_device *thermal_zone_get_by_id(int id) |
753 | { | |
754 | struct thermal_zone_device *tz = NULL; | |
755 | ||
756 | mutex_lock(&thermal_list_lock); | |
757 | list_for_each_entry(tz, &thermal_tz_list, node) { | |
758 | if (tz->id == id) | |
759 | break; | |
760 | } | |
761 | mutex_unlock(&thermal_list_lock); | |
762 | ||
763 | return tz; | |
764 | } | |
765 | ||
3d0055d2 EV |
766 | void thermal_zone_device_unbind_exception(struct thermal_zone_device *tz, |
767 | const char *cdev_type, size_t size) | |
203d3d4a | 768 | { |
3d0055d2 | 769 | struct thermal_cooling_device *cdev = NULL; |
203d3d4a | 770 | |
3d0055d2 EV |
771 | mutex_lock(&thermal_list_lock); |
772 | list_for_each_entry(cdev, &thermal_cdev_list, node) { | |
773 | /* skip non matching cdevs */ | |
774 | if (strncmp(cdev_type, cdev->type, size)) | |
775 | continue; | |
776 | /* unbinding the exception matching the type pattern */ | |
777 | thermal_zone_unbind_cooling_device(tz, THERMAL_TRIPS_NONE, | |
778 | cdev); | |
779 | } | |
780 | mutex_unlock(&thermal_list_lock); | |
203d3d4a ZR |
781 | } |
782 | ||
81193e2e EV |
783 | /* |
784 | * Device management section: cooling devices, zones devices, and binding | |
785 | * | |
786 | * Set of functions provided by the thermal core for: | |
787 | * - cooling devices lifecycle: registration, unregistration, | |
788 | * binding, and unbinding. | |
789 | * - thermal zone devices lifecycle: registration, unregistration, | |
790 | * binding, and unbinding. | |
791 | */ | |
203d3d4a ZR |
792 | |
793 | /** | |
d2e4eb83 EV |
794 | * thermal_zone_bind_cooling_device() - bind a cooling device to a thermal zone |
795 | * @tz: pointer to struct thermal_zone_device | |
203d3d4a ZR |
796 | * @trip: indicates which trip point the cooling devices is |
797 | * associated with in this thermal zone. | |
d2e4eb83 EV |
798 | * @cdev: pointer to struct thermal_cooling_device |
799 | * @upper: the Maximum cooling state for this trip point. | |
800 | * THERMAL_NO_LIMIT means no upper limit, | |
801 | * and the cooling device can be in max_state. | |
802 | * @lower: the Minimum cooling state can be used for this trip point. | |
803 | * THERMAL_NO_LIMIT means no lower limit, | |
804 | * and the cooling device can be in cooling state 0. | |
6cd9e9f6 KS |
805 | * @weight: The weight of the cooling device to be bound to the |
806 | * thermal zone. Use THERMAL_WEIGHT_DEFAULT for the | |
807 | * default value | |
543a9561 | 808 | * |
d2e4eb83 EV |
809 | * This interface function bind a thermal cooling device to the certain trip |
810 | * point of a thermal zone device. | |
543a9561 | 811 | * This function is usually called in the thermal zone device .bind callback. |
d2e4eb83 EV |
812 | * |
813 | * Return: 0 on success, the proper error value otherwise. | |
203d3d4a ZR |
814 | */ |
815 | int thermal_zone_bind_cooling_device(struct thermal_zone_device *tz, | |
816 | int trip, | |
9d99842f | 817 | struct thermal_cooling_device *cdev, |
6cd9e9f6 KS |
818 | unsigned long upper, unsigned long lower, |
819 | unsigned int weight) | |
203d3d4a | 820 | { |
b81b6ba3 ZR |
821 | struct thermal_instance *dev; |
822 | struct thermal_instance *pos; | |
c7516709 TS |
823 | struct thermal_zone_device *pos1; |
824 | struct thermal_cooling_device *pos2; | |
74051ba5 | 825 | unsigned long max_state; |
9a3031dc | 826 | int result, ret; |
203d3d4a | 827 | |
543a9561 | 828 | if (trip >= tz->trips || (trip < 0 && trip != THERMAL_TRIPS_NONE)) |
203d3d4a ZR |
829 | return -EINVAL; |
830 | ||
c7516709 TS |
831 | list_for_each_entry(pos1, &thermal_tz_list, node) { |
832 | if (pos1 == tz) | |
833 | break; | |
834 | } | |
835 | list_for_each_entry(pos2, &thermal_cdev_list, node) { | |
836 | if (pos2 == cdev) | |
837 | break; | |
838 | } | |
839 | ||
840 | if (tz != pos1 || cdev != pos2) | |
203d3d4a ZR |
841 | return -EINVAL; |
842 | ||
9a3031dc LM |
843 | ret = cdev->ops->get_max_state(cdev, &max_state); |
844 | if (ret) | |
845 | return ret; | |
9d99842f ZR |
846 | |
847 | /* lower default 0, upper default max_state */ | |
848 | lower = lower == THERMAL_NO_LIMIT ? 0 : lower; | |
849 | upper = upper == THERMAL_NO_LIMIT ? max_state : upper; | |
850 | ||
851 | if (lower > upper || upper > max_state) | |
852 | return -EINVAL; | |
853 | ||
95e3ed15 | 854 | dev = kzalloc(sizeof(*dev), GFP_KERNEL); |
203d3d4a ZR |
855 | if (!dev) |
856 | return -ENOMEM; | |
857 | dev->tz = tz; | |
858 | dev->cdev = cdev; | |
859 | dev->trip = trip; | |
9d99842f ZR |
860 | dev->upper = upper; |
861 | dev->lower = lower; | |
ce119f83 | 862 | dev->target = THERMAL_NO_TARGET; |
6cd9e9f6 | 863 | dev->weight = weight; |
74051ba5 | 864 | |
b31ef828 MW |
865 | result = ida_simple_get(&tz->ida, 0, 0, GFP_KERNEL); |
866 | if (result < 0) | |
203d3d4a ZR |
867 | goto free_mem; |
868 | ||
b31ef828 | 869 | dev->id = result; |
203d3d4a ZR |
870 | sprintf(dev->name, "cdev%d", dev->id); |
871 | result = | |
872 | sysfs_create_link(&tz->device.kobj, &cdev->device.kobj, dev->name); | |
873 | if (result) | |
b31ef828 | 874 | goto release_ida; |
203d3d4a ZR |
875 | |
876 | sprintf(dev->attr_name, "cdev%d_trip_point", dev->id); | |
975f8c56 | 877 | sysfs_attr_init(&dev->attr.attr); |
203d3d4a ZR |
878 | dev->attr.attr.name = dev->attr_name; |
879 | dev->attr.attr.mode = 0444; | |
33e678d4 | 880 | dev->attr.show = trip_point_show; |
203d3d4a ZR |
881 | result = device_create_file(&tz->device, &dev->attr); |
882 | if (result) | |
883 | goto remove_symbol_link; | |
884 | ||
db916513 JM |
885 | sprintf(dev->weight_attr_name, "cdev%d_weight", dev->id); |
886 | sysfs_attr_init(&dev->weight_attr.attr); | |
887 | dev->weight_attr.attr.name = dev->weight_attr_name; | |
888 | dev->weight_attr.attr.mode = S_IWUSR | S_IRUGO; | |
33e678d4 VK |
889 | dev->weight_attr.show = weight_show; |
890 | dev->weight_attr.store = weight_store; | |
db916513 JM |
891 | result = device_create_file(&tz->device, &dev->weight_attr); |
892 | if (result) | |
893 | goto remove_trip_file; | |
894 | ||
203d3d4a | 895 | mutex_lock(&tz->lock); |
f4a821ce | 896 | mutex_lock(&cdev->lock); |
cddf31b3 | 897 | list_for_each_entry(pos, &tz->thermal_instances, tz_node) |
b659a30d EV |
898 | if (pos->tz == tz && pos->trip == trip && pos->cdev == cdev) { |
899 | result = -EEXIST; | |
900 | break; | |
901 | } | |
b5e4ae62 | 902 | if (!result) { |
cddf31b3 | 903 | list_add_tail(&dev->tz_node, &tz->thermal_instances); |
b5e4ae62 | 904 | list_add_tail(&dev->cdev_node, &cdev->thermal_instances); |
4511f716 | 905 | atomic_set(&tz->need_update, 1); |
b5e4ae62 | 906 | } |
f4a821ce | 907 | mutex_unlock(&cdev->lock); |
203d3d4a ZR |
908 | mutex_unlock(&tz->lock); |
909 | ||
910 | if (!result) | |
911 | return 0; | |
912 | ||
db916513 JM |
913 | device_remove_file(&tz->device, &dev->weight_attr); |
914 | remove_trip_file: | |
203d3d4a | 915 | device_remove_file(&tz->device, &dev->attr); |
caca8b80 | 916 | remove_symbol_link: |
203d3d4a | 917 | sysfs_remove_link(&tz->device.kobj, dev->name); |
b31ef828 MW |
918 | release_ida: |
919 | ida_simple_remove(&tz->ida, dev->id); | |
caca8b80 | 920 | free_mem: |
203d3d4a ZR |
921 | kfree(dev); |
922 | return result; | |
923 | } | |
910cb1e3 | 924 | EXPORT_SYMBOL_GPL(thermal_zone_bind_cooling_device); |
203d3d4a ZR |
925 | |
926 | /** | |
9892e5dc EV |
927 | * thermal_zone_unbind_cooling_device() - unbind a cooling device from a |
928 | * thermal zone. | |
929 | * @tz: pointer to a struct thermal_zone_device. | |
203d3d4a ZR |
930 | * @trip: indicates which trip point the cooling devices is |
931 | * associated with in this thermal zone. | |
9892e5dc | 932 | * @cdev: pointer to a struct thermal_cooling_device. |
543a9561 | 933 | * |
9892e5dc EV |
934 | * This interface function unbind a thermal cooling device from the certain |
935 | * trip point of a thermal zone device. | |
543a9561 | 936 | * This function is usually called in the thermal zone device .unbind callback. |
9892e5dc EV |
937 | * |
938 | * Return: 0 on success, the proper error value otherwise. | |
203d3d4a ZR |
939 | */ |
940 | int thermal_zone_unbind_cooling_device(struct thermal_zone_device *tz, | |
941 | int trip, | |
942 | struct thermal_cooling_device *cdev) | |
943 | { | |
b81b6ba3 | 944 | struct thermal_instance *pos, *next; |
203d3d4a ZR |
945 | |
946 | mutex_lock(&tz->lock); | |
f4a821ce | 947 | mutex_lock(&cdev->lock); |
cddf31b3 | 948 | list_for_each_entry_safe(pos, next, &tz->thermal_instances, tz_node) { |
543a9561 | 949 | if (pos->tz == tz && pos->trip == trip && pos->cdev == cdev) { |
cddf31b3 | 950 | list_del(&pos->tz_node); |
b5e4ae62 | 951 | list_del(&pos->cdev_node); |
f4a821ce | 952 | mutex_unlock(&cdev->lock); |
203d3d4a ZR |
953 | mutex_unlock(&tz->lock); |
954 | goto unbind; | |
955 | } | |
956 | } | |
f4a821ce | 957 | mutex_unlock(&cdev->lock); |
203d3d4a ZR |
958 | mutex_unlock(&tz->lock); |
959 | ||
960 | return -ENODEV; | |
961 | ||
caca8b80 | 962 | unbind: |
528464ea | 963 | device_remove_file(&tz->device, &pos->weight_attr); |
203d3d4a ZR |
964 | device_remove_file(&tz->device, &pos->attr); |
965 | sysfs_remove_link(&tz->device.kobj, pos->name); | |
b31ef828 | 966 | ida_simple_remove(&tz->ida, pos->id); |
203d3d4a ZR |
967 | kfree(pos); |
968 | return 0; | |
969 | } | |
910cb1e3 | 970 | EXPORT_SYMBOL_GPL(thermal_zone_unbind_cooling_device); |
203d3d4a ZR |
971 | |
972 | static void thermal_release(struct device *dev) | |
973 | { | |
974 | struct thermal_zone_device *tz; | |
975 | struct thermal_cooling_device *cdev; | |
976 | ||
caca8b80 JP |
977 | if (!strncmp(dev_name(dev), "thermal_zone", |
978 | sizeof("thermal_zone") - 1)) { | |
203d3d4a | 979 | tz = to_thermal_zone(dev); |
6a6cd25b | 980 | thermal_zone_destroy_device_groups(tz); |
203d3d4a | 981 | kfree(tz); |
b659a30d EV |
982 | } else if (!strncmp(dev_name(dev), "cooling_device", |
983 | sizeof("cooling_device") - 1)) { | |
203d3d4a ZR |
984 | cdev = to_cooling_device(dev); |
985 | kfree(cdev); | |
986 | } | |
987 | } | |
988 | ||
989 | static struct class thermal_class = { | |
990 | .name = "thermal", | |
991 | .dev_release = thermal_release, | |
992 | }; | |
993 | ||
4b0d3c2d EV |
994 | static inline |
995 | void print_bind_err_msg(struct thermal_zone_device *tz, | |
996 | struct thermal_cooling_device *cdev, int ret) | |
f502ab84 EV |
997 | { |
998 | dev_err(&tz->device, "binding zone %s with cdev %s failed:%d\n", | |
999 | tz->type, cdev->type, ret); | |
1000 | } | |
1001 | ||
1002 | static void __bind(struct thermal_zone_device *tz, int mask, | |
1003 | struct thermal_cooling_device *cdev, | |
1004 | unsigned long *limits, | |
1005 | unsigned int weight) | |
1006 | { | |
1007 | int i, ret; | |
1008 | ||
1009 | for (i = 0; i < tz->trips; i++) { | |
1010 | if (mask & (1 << i)) { | |
1011 | unsigned long upper, lower; | |
1012 | ||
1013 | upper = THERMAL_NO_LIMIT; | |
1014 | lower = THERMAL_NO_LIMIT; | |
1015 | if (limits) { | |
1016 | lower = limits[i * 2]; | |
1017 | upper = limits[i * 2 + 1]; | |
1018 | } | |
1019 | ret = thermal_zone_bind_cooling_device(tz, i, cdev, | |
1020 | upper, lower, | |
1021 | weight); | |
1022 | if (ret) | |
1023 | print_bind_err_msg(tz, cdev, ret); | |
1024 | } | |
1025 | } | |
1026 | } | |
1027 | ||
949aad83 EV |
1028 | static void bind_cdev(struct thermal_cooling_device *cdev) |
1029 | { | |
1030 | int i, ret; | |
1031 | const struct thermal_zone_params *tzp; | |
1032 | struct thermal_zone_device *pos = NULL; | |
1033 | ||
1034 | mutex_lock(&thermal_list_lock); | |
1035 | ||
1036 | list_for_each_entry(pos, &thermal_tz_list, node) { | |
1037 | if (!pos->tzp && !pos->ops->bind) | |
1038 | continue; | |
1039 | ||
1040 | if (pos->ops->bind) { | |
1041 | ret = pos->ops->bind(pos, cdev); | |
1042 | if (ret) | |
1043 | print_bind_err_msg(pos, cdev, ret); | |
1044 | continue; | |
1045 | } | |
1046 | ||
1047 | tzp = pos->tzp; | |
1048 | if (!tzp || !tzp->tbp) | |
1049 | continue; | |
1050 | ||
1051 | for (i = 0; i < tzp->num_tbps; i++) { | |
1052 | if (tzp->tbp[i].cdev || !tzp->tbp[i].match) | |
1053 | continue; | |
1054 | if (tzp->tbp[i].match(pos, cdev)) | |
1055 | continue; | |
1056 | tzp->tbp[i].cdev = cdev; | |
1057 | __bind(pos, tzp->tbp[i].trip_mask, cdev, | |
1058 | tzp->tbp[i].binding_limits, | |
1059 | tzp->tbp[i].weight); | |
1060 | } | |
1061 | } | |
1062 | ||
1063 | mutex_unlock(&thermal_list_lock); | |
1064 | } | |
1065 | ||
203d3d4a | 1066 | /** |
a116b5d4 EV |
1067 | * __thermal_cooling_device_register() - register a new thermal cooling device |
1068 | * @np: a pointer to a device tree node. | |
203d3d4a ZR |
1069 | * @type: the thermal cooling device type. |
1070 | * @devdata: device private data. | |
1071 | * @ops: standard thermal cooling devices callbacks. | |
3a6eccb3 EV |
1072 | * |
1073 | * This interface function adds a new thermal cooling device (fan/processor/...) | |
1074 | * to /sys/class/thermal/ folder as cooling_device[0-*]. It tries to bind itself | |
1075 | * to all the thermal zone devices registered at the same time. | |
a116b5d4 EV |
1076 | * It also gives the opportunity to link the cooling device to a device tree |
1077 | * node, so that it can be bound to a thermal zone created out of device tree. | |
3a6eccb3 EV |
1078 | * |
1079 | * Return: a pointer to the created struct thermal_cooling_device or an | |
1080 | * ERR_PTR. Caller must check return value with IS_ERR*() helpers. | |
203d3d4a | 1081 | */ |
a116b5d4 EV |
1082 | static struct thermal_cooling_device * |
1083 | __thermal_cooling_device_register(struct device_node *np, | |
f991de53 | 1084 | const char *type, void *devdata, |
a116b5d4 | 1085 | const struct thermal_cooling_device_ops *ops) |
203d3d4a ZR |
1086 | { |
1087 | struct thermal_cooling_device *cdev; | |
4511f716 | 1088 | struct thermal_zone_device *pos = NULL; |
203d3d4a ZR |
1089 | int result; |
1090 | ||
204dd1d3 | 1091 | if (type && strlen(type) >= THERMAL_NAME_LENGTH) |
3e6fda5c | 1092 | return ERR_PTR(-EINVAL); |
203d3d4a ZR |
1093 | |
1094 | if (!ops || !ops->get_max_state || !ops->get_cur_state || | |
543a9561 | 1095 | !ops->set_cur_state) |
3e6fda5c | 1096 | return ERR_PTR(-EINVAL); |
203d3d4a | 1097 | |
95e3ed15 | 1098 | cdev = kzalloc(sizeof(*cdev), GFP_KERNEL); |
203d3d4a | 1099 | if (!cdev) |
3e6fda5c | 1100 | return ERR_PTR(-ENOMEM); |
203d3d4a | 1101 | |
b31ef828 MW |
1102 | result = ida_simple_get(&thermal_cdev_ida, 0, 0, GFP_KERNEL); |
1103 | if (result < 0) { | |
203d3d4a | 1104 | kfree(cdev); |
3e6fda5c | 1105 | return ERR_PTR(result); |
203d3d4a ZR |
1106 | } |
1107 | ||
b31ef828 | 1108 | cdev->id = result; |
c7a8b9d9 | 1109 | strlcpy(cdev->type, type ? : "", sizeof(cdev->type)); |
f4a821ce | 1110 | mutex_init(&cdev->lock); |
b5e4ae62 | 1111 | INIT_LIST_HEAD(&cdev->thermal_instances); |
a116b5d4 | 1112 | cdev->np = np; |
203d3d4a | 1113 | cdev->ops = ops; |
5ca0cce5 | 1114 | cdev->updated = false; |
203d3d4a ZR |
1115 | cdev->device.class = &thermal_class; |
1116 | cdev->devdata = devdata; | |
8ea22951 | 1117 | thermal_cooling_device_setup_sysfs(cdev); |
354655ea | 1118 | dev_set_name(&cdev->device, "cooling_device%d", cdev->id); |
203d3d4a ZR |
1119 | result = device_register(&cdev->device); |
1120 | if (result) { | |
b31ef828 | 1121 | ida_simple_remove(&thermal_cdev_ida, cdev->id); |
adc8749b | 1122 | put_device(&cdev->device); |
3e6fda5c | 1123 | return ERR_PTR(result); |
203d3d4a ZR |
1124 | } |
1125 | ||
7e8ee1e9 | 1126 | /* Add 'this' new cdev to the global cdev list */ |
203d3d4a ZR |
1127 | mutex_lock(&thermal_list_lock); |
1128 | list_add(&cdev->node, &thermal_cdev_list); | |
203d3d4a ZR |
1129 | mutex_unlock(&thermal_list_lock); |
1130 | ||
7e8ee1e9 D |
1131 | /* Update binding information for 'this' new cdev */ |
1132 | bind_cdev(cdev); | |
1133 | ||
4511f716 CY |
1134 | mutex_lock(&thermal_list_lock); |
1135 | list_for_each_entry(pos, &thermal_tz_list, node) | |
1136 | if (atomic_cmpxchg(&pos->need_update, 1, 0)) | |
0e70f466 SP |
1137 | thermal_zone_device_update(pos, |
1138 | THERMAL_EVENT_UNSPECIFIED); | |
4511f716 CY |
1139 | mutex_unlock(&thermal_list_lock); |
1140 | ||
7e8ee1e9 | 1141 | return cdev; |
203d3d4a | 1142 | } |
a116b5d4 EV |
1143 | |
1144 | /** | |
1145 | * thermal_cooling_device_register() - register a new thermal cooling device | |
1146 | * @type: the thermal cooling device type. | |
1147 | * @devdata: device private data. | |
1148 | * @ops: standard thermal cooling devices callbacks. | |
1149 | * | |
1150 | * This interface function adds a new thermal cooling device (fan/processor/...) | |
1151 | * to /sys/class/thermal/ folder as cooling_device[0-*]. It tries to bind itself | |
1152 | * to all the thermal zone devices registered at the same time. | |
1153 | * | |
1154 | * Return: a pointer to the created struct thermal_cooling_device or an | |
1155 | * ERR_PTR. Caller must check return value with IS_ERR*() helpers. | |
1156 | */ | |
1157 | struct thermal_cooling_device * | |
f991de53 | 1158 | thermal_cooling_device_register(const char *type, void *devdata, |
a116b5d4 EV |
1159 | const struct thermal_cooling_device_ops *ops) |
1160 | { | |
1161 | return __thermal_cooling_device_register(NULL, type, devdata, ops); | |
1162 | } | |
910cb1e3 | 1163 | EXPORT_SYMBOL_GPL(thermal_cooling_device_register); |
203d3d4a | 1164 | |
a116b5d4 EV |
1165 | /** |
1166 | * thermal_of_cooling_device_register() - register an OF thermal cooling device | |
1167 | * @np: a pointer to a device tree node. | |
1168 | * @type: the thermal cooling device type. | |
1169 | * @devdata: device private data. | |
1170 | * @ops: standard thermal cooling devices callbacks. | |
1171 | * | |
1172 | * This function will register a cooling device with device tree node reference. | |
1173 | * This interface function adds a new thermal cooling device (fan/processor/...) | |
1174 | * to /sys/class/thermal/ folder as cooling_device[0-*]. It tries to bind itself | |
1175 | * to all the thermal zone devices registered at the same time. | |
1176 | * | |
1177 | * Return: a pointer to the created struct thermal_cooling_device or an | |
1178 | * ERR_PTR. Caller must check return value with IS_ERR*() helpers. | |
1179 | */ | |
1180 | struct thermal_cooling_device * | |
1181 | thermal_of_cooling_device_register(struct device_node *np, | |
f991de53 | 1182 | const char *type, void *devdata, |
a116b5d4 EV |
1183 | const struct thermal_cooling_device_ops *ops) |
1184 | { | |
1185 | return __thermal_cooling_device_register(np, type, devdata, ops); | |
1186 | } | |
1187 | EXPORT_SYMBOL_GPL(thermal_of_cooling_device_register); | |
1188 | ||
b4ab114c GR |
1189 | static void thermal_cooling_device_release(struct device *dev, void *res) |
1190 | { | |
1191 | thermal_cooling_device_unregister( | |
1192 | *(struct thermal_cooling_device **)res); | |
1193 | } | |
1194 | ||
1195 | /** | |
1196 | * devm_thermal_of_cooling_device_register() - register an OF thermal cooling | |
1197 | * device | |
1198 | * @dev: a valid struct device pointer of a sensor device. | |
1199 | * @np: a pointer to a device tree node. | |
1200 | * @type: the thermal cooling device type. | |
1201 | * @devdata: device private data. | |
1202 | * @ops: standard thermal cooling devices callbacks. | |
1203 | * | |
1204 | * This function will register a cooling device with device tree node reference. | |
1205 | * This interface function adds a new thermal cooling device (fan/processor/...) | |
1206 | * to /sys/class/thermal/ folder as cooling_device[0-*]. It tries to bind itself | |
1207 | * to all the thermal zone devices registered at the same time. | |
1208 | * | |
1209 | * Return: a pointer to the created struct thermal_cooling_device or an | |
1210 | * ERR_PTR. Caller must check return value with IS_ERR*() helpers. | |
1211 | */ | |
1212 | struct thermal_cooling_device * | |
1213 | devm_thermal_of_cooling_device_register(struct device *dev, | |
1214 | struct device_node *np, | |
1215 | char *type, void *devdata, | |
1216 | const struct thermal_cooling_device_ops *ops) | |
1217 | { | |
1218 | struct thermal_cooling_device **ptr, *tcd; | |
1219 | ||
1220 | ptr = devres_alloc(thermal_cooling_device_release, sizeof(*ptr), | |
1221 | GFP_KERNEL); | |
1222 | if (!ptr) | |
1223 | return ERR_PTR(-ENOMEM); | |
1224 | ||
1225 | tcd = __thermal_cooling_device_register(np, type, devdata, ops); | |
1226 | if (IS_ERR(tcd)) { | |
1227 | devres_free(ptr); | |
1228 | return tcd; | |
1229 | } | |
1230 | ||
1231 | *ptr = tcd; | |
1232 | devres_add(dev, ptr); | |
1233 | ||
1234 | return tcd; | |
1235 | } | |
1236 | EXPORT_SYMBOL_GPL(devm_thermal_of_cooling_device_register); | |
1237 | ||
f11997fa EV |
1238 | static void __unbind(struct thermal_zone_device *tz, int mask, |
1239 | struct thermal_cooling_device *cdev) | |
1240 | { | |
1241 | int i; | |
1242 | ||
1243 | for (i = 0; i < tz->trips; i++) | |
1244 | if (mask & (1 << i)) | |
1245 | thermal_zone_unbind_cooling_device(tz, i, cdev); | |
1246 | } | |
1247 | ||
203d3d4a | 1248 | /** |
38e7b549 | 1249 | * thermal_cooling_device_unregister - removes a thermal cooling device |
203d3d4a ZR |
1250 | * @cdev: the thermal cooling device to remove. |
1251 | * | |
38e7b549 EV |
1252 | * thermal_cooling_device_unregister() must be called when a registered |
1253 | * thermal cooling device is no longer needed. | |
203d3d4a | 1254 | */ |
7e8ee1e9 | 1255 | void thermal_cooling_device_unregister(struct thermal_cooling_device *cdev) |
203d3d4a | 1256 | { |
7e8ee1e9 D |
1257 | int i; |
1258 | const struct thermal_zone_params *tzp; | |
203d3d4a ZR |
1259 | struct thermal_zone_device *tz; |
1260 | struct thermal_cooling_device *pos = NULL; | |
1261 | ||
1262 | if (!cdev) | |
1263 | return; | |
1264 | ||
1265 | mutex_lock(&thermal_list_lock); | |
1266 | list_for_each_entry(pos, &thermal_cdev_list, node) | |
b659a30d EV |
1267 | if (pos == cdev) |
1268 | break; | |
203d3d4a ZR |
1269 | if (pos != cdev) { |
1270 | /* thermal cooling device not found */ | |
1271 | mutex_unlock(&thermal_list_lock); | |
1272 | return; | |
1273 | } | |
1274 | list_del(&cdev->node); | |
7e8ee1e9 D |
1275 | |
1276 | /* Unbind all thermal zones associated with 'this' cdev */ | |
203d3d4a | 1277 | list_for_each_entry(tz, &thermal_tz_list, node) { |
7e8ee1e9 D |
1278 | if (tz->ops->unbind) { |
1279 | tz->ops->unbind(tz, cdev); | |
1280 | continue; | |
1281 | } | |
1282 | ||
1283 | if (!tz->tzp || !tz->tzp->tbp) | |
203d3d4a | 1284 | continue; |
7e8ee1e9 D |
1285 | |
1286 | tzp = tz->tzp; | |
1287 | for (i = 0; i < tzp->num_tbps; i++) { | |
1288 | if (tzp->tbp[i].cdev == cdev) { | |
1289 | __unbind(tz, tzp->tbp[i].trip_mask, cdev); | |
1290 | tzp->tbp[i].cdev = NULL; | |
1291 | } | |
1292 | } | |
203d3d4a | 1293 | } |
7e8ee1e9 | 1294 | |
203d3d4a | 1295 | mutex_unlock(&thermal_list_lock); |
7e8ee1e9 | 1296 | |
b31ef828 | 1297 | ida_simple_remove(&thermal_cdev_ida, cdev->id); |
3c587768 | 1298 | device_del(&cdev->device); |
8ea22951 | 1299 | thermal_cooling_device_destroy_sysfs(cdev); |
3c587768 | 1300 | put_device(&cdev->device); |
203d3d4a | 1301 | } |
910cb1e3 | 1302 | EXPORT_SYMBOL_GPL(thermal_cooling_device_unregister); |
203d3d4a | 1303 | |
90f5b5bb | 1304 | static void bind_tz(struct thermal_zone_device *tz) |
ce119f83 | 1305 | { |
90f5b5bb EV |
1306 | int i, ret; |
1307 | struct thermal_cooling_device *pos = NULL; | |
1308 | const struct thermal_zone_params *tzp = tz->tzp; | |
ce119f83 | 1309 | |
90f5b5bb | 1310 | if (!tzp && !tz->ops->bind) |
ce119f83 | 1311 | return; |
c56f5c03 | 1312 | |
90f5b5bb | 1313 | mutex_lock(&thermal_list_lock); |
c56f5c03 | 1314 | |
90f5b5bb EV |
1315 | /* If there is ops->bind, try to use ops->bind */ |
1316 | if (tz->ops->bind) { | |
1317 | list_for_each_entry(pos, &thermal_cdev_list, node) { | |
1318 | ret = tz->ops->bind(tz, pos); | |
1319 | if (ret) | |
1320 | print_bind_err_msg(tz, pos, ret); | |
27365a6c | 1321 | } |
90f5b5bb | 1322 | goto exit; |
27365a6c | 1323 | } |
c56f5c03 | 1324 | |
90f5b5bb EV |
1325 | if (!tzp || !tzp->tbp) |
1326 | goto exit; | |
27365a6c | 1327 | |
90f5b5bb EV |
1328 | list_for_each_entry(pos, &thermal_cdev_list, node) { |
1329 | for (i = 0; i < tzp->num_tbps; i++) { | |
1330 | if (tzp->tbp[i].cdev || !tzp->tbp[i].match) | |
1331 | continue; | |
1332 | if (tzp->tbp[i].match(tz, pos)) | |
1333 | continue; | |
1334 | tzp->tbp[i].cdev = pos; | |
1335 | __bind(tz, tzp->tbp[i].trip_mask, pos, | |
1336 | tzp->tbp[i].binding_limits, | |
1337 | tzp->tbp[i].weight); | |
27365a6c | 1338 | } |
c56f5c03 | 1339 | } |
90f5b5bb EV |
1340 | exit: |
1341 | mutex_unlock(&thermal_list_lock); | |
c56f5c03 D |
1342 | } |
1343 | ||
203d3d4a | 1344 | /** |
a00e55f9 | 1345 | * thermal_zone_device_register() - register a new thermal zone device |
203d3d4a ZR |
1346 | * @type: the thermal zone device type |
1347 | * @trips: the number of trip points the thermal zone support | |
c56f5c03 | 1348 | * @mask: a bit string indicating the writeablility of trip points |
203d3d4a ZR |
1349 | * @devdata: private device data |
1350 | * @ops: standard thermal zone device callbacks | |
50125a9b | 1351 | * @tzp: thermal zone platform parameters |
b1569e99 MG |
1352 | * @passive_delay: number of milliseconds to wait between polls when |
1353 | * performing passive cooling | |
1354 | * @polling_delay: number of milliseconds to wait between polls when checking | |
1355 | * whether trip points have been crossed (0 for interrupt | |
1356 | * driven systems) | |
203d3d4a | 1357 | * |
a00e55f9 EV |
1358 | * This interface function adds a new thermal zone device (sensor) to |
1359 | * /sys/class/thermal folder as thermal_zone[0-*]. It tries to bind all the | |
1360 | * thermal cooling devices registered at the same time. | |
203d3d4a | 1361 | * thermal_zone_device_unregister() must be called when the device is no |
1b7ddb84 | 1362 | * longer needed. The passive cooling depends on the .get_trend() return value. |
a00e55f9 EV |
1363 | * |
1364 | * Return: a pointer to the created struct thermal_zone_device or an | |
1365 | * in case of error, an ERR_PTR. Caller must check return value with | |
1366 | * IS_ERR*() helpers. | |
203d3d4a | 1367 | */ |
eb7be329 EV |
1368 | struct thermal_zone_device * |
1369 | thermal_zone_device_register(const char *type, int trips, int mask, | |
1370 | void *devdata, struct thermal_zone_device_ops *ops, | |
1371 | struct thermal_zone_params *tzp, int passive_delay, | |
1372 | int polling_delay) | |
203d3d4a ZR |
1373 | { |
1374 | struct thermal_zone_device *tz; | |
03a971a2 | 1375 | enum thermal_trip_type trip_type; |
81ad4276 | 1376 | int trip_temp; |
adc8749b | 1377 | int id; |
203d3d4a ZR |
1378 | int result; |
1379 | int count; | |
e33df1d2 | 1380 | struct thermal_governor *governor; |
203d3d4a | 1381 | |
67eed44b AK |
1382 | if (!type || strlen(type) == 0) { |
1383 | pr_err("Error: No thermal zone type defined\n"); | |
54fa38cc | 1384 | return ERR_PTR(-EINVAL); |
67eed44b | 1385 | } |
54fa38cc | 1386 | |
67eed44b AK |
1387 | if (type && strlen(type) >= THERMAL_NAME_LENGTH) { |
1388 | pr_err("Error: Thermal zone name (%s) too long, should be under %d chars\n", | |
1389 | type, THERMAL_NAME_LENGTH); | |
3e6fda5c | 1390 | return ERR_PTR(-EINVAL); |
67eed44b | 1391 | } |
203d3d4a | 1392 | |
67eed44b AK |
1393 | if (trips > THERMAL_MAX_TRIPS || trips < 0 || mask >> trips) { |
1394 | pr_err("Error: Incorrect number of thermal trips\n"); | |
3e6fda5c | 1395 | return ERR_PTR(-EINVAL); |
67eed44b | 1396 | } |
203d3d4a | 1397 | |
67eed44b AK |
1398 | if (!ops) { |
1399 | pr_err("Error: Thermal zone device ops not defined\n"); | |
3e6fda5c | 1400 | return ERR_PTR(-EINVAL); |
67eed44b | 1401 | } |
203d3d4a | 1402 | |
83720d0b | 1403 | if (trips > 0 && (!ops->get_trip_type || !ops->get_trip_temp)) |
6b2aa51d EV |
1404 | return ERR_PTR(-EINVAL); |
1405 | ||
95e3ed15 | 1406 | tz = kzalloc(sizeof(*tz), GFP_KERNEL); |
203d3d4a | 1407 | if (!tz) |
3e6fda5c | 1408 | return ERR_PTR(-ENOMEM); |
203d3d4a | 1409 | |
2d374139 | 1410 | INIT_LIST_HEAD(&tz->thermal_instances); |
b31ef828 | 1411 | ida_init(&tz->ida); |
203d3d4a | 1412 | mutex_init(&tz->lock); |
adc8749b YH |
1413 | id = ida_simple_get(&thermal_tz_ida, 0, 0, GFP_KERNEL); |
1414 | if (id < 0) { | |
1415 | result = id; | |
9d9ca1f9 | 1416 | goto free_tz; |
adc8749b | 1417 | } |
203d3d4a | 1418 | |
adc8749b | 1419 | tz->id = id; |
54fa38cc | 1420 | strlcpy(tz->type, type, sizeof(tz->type)); |
203d3d4a | 1421 | tz->ops = ops; |
50125a9b | 1422 | tz->tzp = tzp; |
203d3d4a ZR |
1423 | tz->device.class = &thermal_class; |
1424 | tz->devdata = devdata; | |
1425 | tz->trips = trips; | |
b1569e99 MG |
1426 | tz->passive_delay = passive_delay; |
1427 | tz->polling_delay = polling_delay; | |
1c600861 | 1428 | |
4d0fe749 | 1429 | /* sys I/F */ |
1c600861 | 1430 | /* Add nodes that are always present via .groups */ |
4d0fe749 EV |
1431 | result = thermal_zone_create_device_groups(tz, mask); |
1432 | if (result) | |
9d9ca1f9 | 1433 | goto remove_id; |
4d0fe749 | 1434 | |
4511f716 CY |
1435 | /* A new thermal zone needs to be updated anyway. */ |
1436 | atomic_set(&tz->need_update, 1); | |
b1569e99 | 1437 | |
354655ea | 1438 | dev_set_name(&tz->device, "thermal_zone%d", tz->id); |
203d3d4a | 1439 | result = device_register(&tz->device); |
9d9ca1f9 | 1440 | if (result) |
adc8749b | 1441 | goto release_device; |
203d3d4a | 1442 | |
203d3d4a | 1443 | for (count = 0; count < trips; count++) { |
81ad4276 ZR |
1444 | if (tz->ops->get_trip_type(tz, count, &trip_type)) |
1445 | set_bit(count, &tz->trips_disabled); | |
81ad4276 ZR |
1446 | if (tz->ops->get_trip_temp(tz, count, &trip_temp)) |
1447 | set_bit(count, &tz->trips_disabled); | |
1448 | /* Check for bogus trip points */ | |
1449 | if (trip_temp == 0) | |
1450 | set_bit(count, &tz->trips_disabled); | |
203d3d4a ZR |
1451 | } |
1452 | ||
a4a15485 D |
1453 | /* Update 'this' zone's governor information */ |
1454 | mutex_lock(&thermal_governor_lock); | |
1455 | ||
1456 | if (tz->tzp) | |
e33df1d2 | 1457 | governor = __find_governor(tz->tzp->governor_name); |
a4a15485 | 1458 | else |
e33df1d2 JM |
1459 | governor = def_governor; |
1460 | ||
1461 | result = thermal_set_governor(tz, governor); | |
1462 | if (result) { | |
1463 | mutex_unlock(&thermal_governor_lock); | |
1464 | goto unregister; | |
1465 | } | |
a4a15485 D |
1466 | |
1467 | mutex_unlock(&thermal_governor_lock); | |
1468 | ||
ccba4ffd EV |
1469 | if (!tz->tzp || !tz->tzp->no_hwmon) { |
1470 | result = thermal_add_hwmon_sysfs(tz); | |
1471 | if (result) | |
1472 | goto unregister; | |
1473 | } | |
e68b16ab | 1474 | |
203d3d4a ZR |
1475 | mutex_lock(&thermal_list_lock); |
1476 | list_add_tail(&tz->node, &thermal_tz_list); | |
203d3d4a ZR |
1477 | mutex_unlock(&thermal_list_lock); |
1478 | ||
7e8ee1e9 D |
1479 | /* Bind cooling devices for this zone */ |
1480 | bind_tz(tz); | |
1481 | ||
b659a30d | 1482 | INIT_DELAYED_WORK(&tz->poll_queue, thermal_zone_device_check); |
b1569e99 | 1483 | |
bb431ba2 | 1484 | thermal_zone_device_reset(tz); |
4511f716 CY |
1485 | /* Update the new thermal zone and mark it as already updated. */ |
1486 | if (atomic_cmpxchg(&tz->need_update, 1, 0)) | |
0e70f466 | 1487 | thermal_zone_device_update(tz, THERMAL_EVENT_UNSPECIFIED); |
b1569e99 | 1488 | |
55cdf0a2 DL |
1489 | thermal_notify_tz_create(tz->id, tz->type); |
1490 | ||
14015860 | 1491 | return tz; |
203d3d4a | 1492 | |
caca8b80 | 1493 | unregister: |
adc8749b YH |
1494 | device_del(&tz->device); |
1495 | release_device: | |
1496 | put_device(&tz->device); | |
1497 | tz = NULL; | |
9d9ca1f9 | 1498 | remove_id: |
adc8749b | 1499 | ida_simple_remove(&thermal_tz_ida, id); |
9d9ca1f9 CJ |
1500 | free_tz: |
1501 | kfree(tz); | |
1502 | return ERR_PTR(result); | |
203d3d4a | 1503 | } |
910cb1e3 | 1504 | EXPORT_SYMBOL_GPL(thermal_zone_device_register); |
203d3d4a ZR |
1505 | |
1506 | /** | |
1507 | * thermal_device_unregister - removes the registered thermal zone device | |
203d3d4a ZR |
1508 | * @tz: the thermal zone device to remove |
1509 | */ | |
1510 | void thermal_zone_device_unregister(struct thermal_zone_device *tz) | |
1511 | { | |
7e8ee1e9 D |
1512 | int i; |
1513 | const struct thermal_zone_params *tzp; | |
203d3d4a ZR |
1514 | struct thermal_cooling_device *cdev; |
1515 | struct thermal_zone_device *pos = NULL; | |
203d3d4a ZR |
1516 | |
1517 | if (!tz) | |
1518 | return; | |
1519 | ||
7e8ee1e9 D |
1520 | tzp = tz->tzp; |
1521 | ||
203d3d4a ZR |
1522 | mutex_lock(&thermal_list_lock); |
1523 | list_for_each_entry(pos, &thermal_tz_list, node) | |
b659a30d EV |
1524 | if (pos == tz) |
1525 | break; | |
203d3d4a ZR |
1526 | if (pos != tz) { |
1527 | /* thermal zone device not found */ | |
1528 | mutex_unlock(&thermal_list_lock); | |
1529 | return; | |
1530 | } | |
1531 | list_del(&tz->node); | |
7e8ee1e9 D |
1532 | |
1533 | /* Unbind all cdevs associated with 'this' thermal zone */ | |
1534 | list_for_each_entry(cdev, &thermal_cdev_list, node) { | |
1535 | if (tz->ops->unbind) { | |
1536 | tz->ops->unbind(tz, cdev); | |
1537 | continue; | |
1538 | } | |
1539 | ||
1540 | if (!tzp || !tzp->tbp) | |
1541 | break; | |
1542 | ||
1543 | for (i = 0; i < tzp->num_tbps; i++) { | |
1544 | if (tzp->tbp[i].cdev == cdev) { | |
1545 | __unbind(tz, tzp->tbp[i].trip_mask, cdev); | |
1546 | tzp->tbp[i].cdev = NULL; | |
1547 | } | |
1548 | } | |
1549 | } | |
1550 | ||
203d3d4a ZR |
1551 | mutex_unlock(&thermal_list_lock); |
1552 | ||
163b00cd | 1553 | cancel_delayed_work_sync(&tz->poll_queue); |
b1569e99 | 1554 | |
e33df1d2 | 1555 | thermal_set_governor(tz, NULL); |
203d3d4a | 1556 | |
e68b16ab | 1557 | thermal_remove_hwmon_sysfs(tz); |
b31ef828 MW |
1558 | ida_simple_remove(&thermal_tz_ida, tz->id); |
1559 | ida_destroy(&tz->ida); | |
203d3d4a ZR |
1560 | mutex_destroy(&tz->lock); |
1561 | device_unregister(&tz->device); | |
55cdf0a2 DL |
1562 | |
1563 | thermal_notify_tz_delete(tz->id); | |
203d3d4a | 1564 | } |
910cb1e3 | 1565 | EXPORT_SYMBOL_GPL(thermal_zone_device_unregister); |
203d3d4a | 1566 | |
63c4d919 EV |
1567 | /** |
1568 | * thermal_zone_get_zone_by_name() - search for a zone and returns its ref | |
1569 | * @name: thermal zone name to fetch the temperature | |
1570 | * | |
1571 | * When only one zone is found with the passed name, returns a reference to it. | |
1572 | * | |
1573 | * Return: On success returns a reference to an unique thermal zone with | |
1574 | * matching name equals to @name, an ERR_PTR otherwise (-EINVAL for invalid | |
1575 | * paramenters, -ENODEV for not found and -EEXIST for multiple matches). | |
1576 | */ | |
1577 | struct thermal_zone_device *thermal_zone_get_zone_by_name(const char *name) | |
1578 | { | |
1579 | struct thermal_zone_device *pos = NULL, *ref = ERR_PTR(-EINVAL); | |
1580 | unsigned int found = 0; | |
1581 | ||
1582 | if (!name) | |
1583 | goto exit; | |
1584 | ||
1585 | mutex_lock(&thermal_list_lock); | |
1586 | list_for_each_entry(pos, &thermal_tz_list, node) | |
484ac2f3 | 1587 | if (!strncasecmp(name, pos->type, THERMAL_NAME_LENGTH)) { |
63c4d919 EV |
1588 | found++; |
1589 | ref = pos; | |
1590 | } | |
1591 | mutex_unlock(&thermal_list_lock); | |
1592 | ||
1593 | /* nothing has been found, thus an error code for it */ | |
1594 | if (found == 0) | |
1595 | ref = ERR_PTR(-ENODEV); | |
1596 | else if (found > 1) | |
1597 | /* Success only when an unique zone is found */ | |
1598 | ref = ERR_PTR(-EEXIST); | |
1599 | ||
1600 | exit: | |
1601 | return ref; | |
1602 | } | |
1603 | EXPORT_SYMBOL_GPL(thermal_zone_get_zone_by_name); | |
1604 | ||
ff140fea | 1605 | static int thermal_pm_notify(struct notifier_block *nb, |
eb7be329 | 1606 | unsigned long mode, void *_unused) |
ff140fea ZR |
1607 | { |
1608 | struct thermal_zone_device *tz; | |
1609 | ||
1610 | switch (mode) { | |
1611 | case PM_HIBERNATION_PREPARE: | |
1612 | case PM_RESTORE_PREPARE: | |
1613 | case PM_SUSPEND_PREPARE: | |
1614 | atomic_set(&in_suspend, 1); | |
1615 | break; | |
1616 | case PM_POST_HIBERNATION: | |
1617 | case PM_POST_RESTORE: | |
1618 | case PM_POST_SUSPEND: | |
1619 | atomic_set(&in_suspend, 0); | |
1620 | list_for_each_entry(tz, &thermal_tz_list, node) { | |
7f4957be | 1621 | if (!thermal_zone_device_is_enabled(tz)) |
ff54bbd1 WW |
1622 | continue; |
1623 | ||
964f4843 | 1624 | thermal_zone_device_init(tz); |
0e70f466 SP |
1625 | thermal_zone_device_update(tz, |
1626 | THERMAL_EVENT_UNSPECIFIED); | |
ff140fea ZR |
1627 | } |
1628 | break; | |
1629 | default: | |
1630 | break; | |
1631 | } | |
1632 | return 0; | |
1633 | } | |
1634 | ||
1635 | static struct notifier_block thermal_pm_nb = { | |
1636 | .notifier_call = thermal_pm_notify, | |
1637 | }; | |
1638 | ||
203d3d4a ZR |
1639 | static int __init thermal_init(void) |
1640 | { | |
80a26a5c ZR |
1641 | int result; |
1642 | ||
e441fd68 | 1643 | mutex_init(&poweroff_lock); |
80a26a5c ZR |
1644 | result = thermal_register_governors(); |
1645 | if (result) | |
1646 | goto error; | |
203d3d4a ZR |
1647 | |
1648 | result = class_register(&thermal_class); | |
80a26a5c ZR |
1649 | if (result) |
1650 | goto unregister_governors; | |
1651 | ||
4e5e4705 EV |
1652 | result = of_parse_thermal_zones(); |
1653 | if (result) | |
f96c8e50 | 1654 | goto unregister_class; |
4e5e4705 | 1655 | |
ff140fea ZR |
1656 | result = register_pm_notifier(&thermal_pm_nb); |
1657 | if (result) | |
1658 | pr_warn("Thermal: Can not register suspend notifier, return %d\n", | |
1659 | result); | |
1660 | ||
80a26a5c ZR |
1661 | return 0; |
1662 | ||
80a26a5c ZR |
1663 | unregister_class: |
1664 | class_unregister(&thermal_class); | |
9d367e5e LH |
1665 | unregister_governors: |
1666 | thermal_unregister_governors(); | |
80a26a5c | 1667 | error: |
b31ef828 MW |
1668 | ida_destroy(&thermal_tz_ida); |
1669 | ida_destroy(&thermal_cdev_ida); | |
80a26a5c ZR |
1670 | mutex_destroy(&thermal_list_lock); |
1671 | mutex_destroy(&thermal_governor_lock); | |
e441fd68 | 1672 | mutex_destroy(&poweroff_lock); |
203d3d4a ZR |
1673 | return result; |
1674 | } | |
ae16a688 | 1675 | core_initcall(thermal_init); |