| 1 | // SPDX-License-Identifier: GPL-2.0 |
| 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> |
| 8 | */ |
| 9 | |
| 10 | #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt |
| 11 | |
| 12 | #include <linux/device.h> |
| 13 | #include <linux/err.h> |
| 14 | #include <linux/export.h> |
| 15 | #include <linux/slab.h> |
| 16 | #include <linux/kdev_t.h> |
| 17 | #include <linux/idr.h> |
| 18 | #include <linux/list_sort.h> |
| 19 | #include <linux/thermal.h> |
| 20 | #include <linux/reboot.h> |
| 21 | #include <linux/string.h> |
| 22 | #include <linux/of.h> |
| 23 | #include <linux/suspend.h> |
| 24 | |
| 25 | #define CREATE_TRACE_POINTS |
| 26 | #include "thermal_trace.h" |
| 27 | |
| 28 | #include "thermal_core.h" |
| 29 | #include "thermal_hwmon.h" |
| 30 | |
| 31 | static DEFINE_IDA(thermal_tz_ida); |
| 32 | static DEFINE_IDA(thermal_cdev_ida); |
| 33 | |
| 34 | static LIST_HEAD(thermal_tz_list); |
| 35 | static LIST_HEAD(thermal_cdev_list); |
| 36 | static LIST_HEAD(thermal_governor_list); |
| 37 | |
| 38 | static DEFINE_MUTEX(thermal_list_lock); |
| 39 | static DEFINE_MUTEX(thermal_governor_lock); |
| 40 | |
| 41 | static struct thermal_governor *def_governor; |
| 42 | |
| 43 | /* |
| 44 | * Governor section: set of functions to handle thermal governors |
| 45 | * |
| 46 | * Functions to help in the life cycle of thermal governors within |
| 47 | * the thermal core and by the thermal governor code. |
| 48 | */ |
| 49 | |
| 50 | static struct thermal_governor *__find_governor(const char *name) |
| 51 | { |
| 52 | struct thermal_governor *pos; |
| 53 | |
| 54 | if (!name || !name[0]) |
| 55 | return def_governor; |
| 56 | |
| 57 | list_for_each_entry(pos, &thermal_governor_list, governor_list) |
| 58 | if (!strncasecmp(name, pos->name, THERMAL_NAME_LENGTH)) |
| 59 | return pos; |
| 60 | |
| 61 | return NULL; |
| 62 | } |
| 63 | |
| 64 | /** |
| 65 | * bind_previous_governor() - bind the previous governor of the thermal zone |
| 66 | * @tz: a valid pointer to a struct thermal_zone_device |
| 67 | * @failed_gov_name: the name of the governor that failed to register |
| 68 | * |
| 69 | * Register the previous governor of the thermal zone after a new |
| 70 | * governor has failed to be bound. |
| 71 | */ |
| 72 | static void bind_previous_governor(struct thermal_zone_device *tz, |
| 73 | const char *failed_gov_name) |
| 74 | { |
| 75 | if (tz->governor && tz->governor->bind_to_tz) { |
| 76 | if (tz->governor->bind_to_tz(tz)) { |
| 77 | dev_err(&tz->device, |
| 78 | "governor %s failed to bind and the previous one (%s) failed to bind again, thermal zone %s has no governor\n", |
| 79 | failed_gov_name, tz->governor->name, tz->type); |
| 80 | tz->governor = NULL; |
| 81 | } |
| 82 | } |
| 83 | } |
| 84 | |
| 85 | /** |
| 86 | * thermal_set_governor() - Switch to another governor |
| 87 | * @tz: a valid pointer to a struct thermal_zone_device |
| 88 | * @new_gov: pointer to the new governor |
| 89 | * |
| 90 | * Change the governor of thermal zone @tz. |
| 91 | * |
| 92 | * Return: 0 on success, an error if the new governor's bind_to_tz() failed. |
| 93 | */ |
| 94 | static int thermal_set_governor(struct thermal_zone_device *tz, |
| 95 | struct thermal_governor *new_gov) |
| 96 | { |
| 97 | int ret = 0; |
| 98 | |
| 99 | if (tz->governor && tz->governor->unbind_from_tz) |
| 100 | tz->governor->unbind_from_tz(tz); |
| 101 | |
| 102 | if (new_gov && new_gov->bind_to_tz) { |
| 103 | ret = new_gov->bind_to_tz(tz); |
| 104 | if (ret) { |
| 105 | bind_previous_governor(tz, new_gov->name); |
| 106 | |
| 107 | return ret; |
| 108 | } |
| 109 | } |
| 110 | |
| 111 | tz->governor = new_gov; |
| 112 | |
| 113 | return ret; |
| 114 | } |
| 115 | |
| 116 | int thermal_register_governor(struct thermal_governor *governor) |
| 117 | { |
| 118 | int err; |
| 119 | const char *name; |
| 120 | struct thermal_zone_device *pos; |
| 121 | |
| 122 | if (!governor) |
| 123 | return -EINVAL; |
| 124 | |
| 125 | mutex_lock(&thermal_governor_lock); |
| 126 | |
| 127 | err = -EBUSY; |
| 128 | if (!__find_governor(governor->name)) { |
| 129 | bool match_default; |
| 130 | |
| 131 | err = 0; |
| 132 | list_add(&governor->governor_list, &thermal_governor_list); |
| 133 | match_default = !strncmp(governor->name, |
| 134 | DEFAULT_THERMAL_GOVERNOR, |
| 135 | THERMAL_NAME_LENGTH); |
| 136 | |
| 137 | if (!def_governor && match_default) |
| 138 | def_governor = governor; |
| 139 | } |
| 140 | |
| 141 | mutex_lock(&thermal_list_lock); |
| 142 | |
| 143 | list_for_each_entry(pos, &thermal_tz_list, node) { |
| 144 | /* |
| 145 | * only thermal zones with specified tz->tzp->governor_name |
| 146 | * may run with tz->govenor unset |
| 147 | */ |
| 148 | if (pos->governor) |
| 149 | continue; |
| 150 | |
| 151 | name = pos->tzp->governor_name; |
| 152 | |
| 153 | if (!strncasecmp(name, governor->name, THERMAL_NAME_LENGTH)) { |
| 154 | int ret; |
| 155 | |
| 156 | ret = thermal_set_governor(pos, governor); |
| 157 | if (ret) |
| 158 | dev_err(&pos->device, |
| 159 | "Failed to set governor %s for thermal zone %s: %d\n", |
| 160 | governor->name, pos->type, ret); |
| 161 | } |
| 162 | } |
| 163 | |
| 164 | mutex_unlock(&thermal_list_lock); |
| 165 | mutex_unlock(&thermal_governor_lock); |
| 166 | |
| 167 | return err; |
| 168 | } |
| 169 | |
| 170 | void thermal_unregister_governor(struct thermal_governor *governor) |
| 171 | { |
| 172 | struct thermal_zone_device *pos; |
| 173 | |
| 174 | if (!governor) |
| 175 | return; |
| 176 | |
| 177 | mutex_lock(&thermal_governor_lock); |
| 178 | |
| 179 | if (!__find_governor(governor->name)) |
| 180 | goto exit; |
| 181 | |
| 182 | mutex_lock(&thermal_list_lock); |
| 183 | |
| 184 | list_for_each_entry(pos, &thermal_tz_list, node) { |
| 185 | if (!strncasecmp(pos->governor->name, governor->name, |
| 186 | THERMAL_NAME_LENGTH)) |
| 187 | thermal_set_governor(pos, NULL); |
| 188 | } |
| 189 | |
| 190 | mutex_unlock(&thermal_list_lock); |
| 191 | list_del(&governor->governor_list); |
| 192 | exit: |
| 193 | mutex_unlock(&thermal_governor_lock); |
| 194 | } |
| 195 | |
| 196 | int thermal_zone_device_set_policy(struct thermal_zone_device *tz, |
| 197 | char *policy) |
| 198 | { |
| 199 | struct thermal_governor *gov; |
| 200 | int ret = -EINVAL; |
| 201 | |
| 202 | mutex_lock(&thermal_governor_lock); |
| 203 | mutex_lock(&tz->lock); |
| 204 | |
| 205 | gov = __find_governor(strim(policy)); |
| 206 | if (!gov) |
| 207 | goto exit; |
| 208 | |
| 209 | ret = thermal_set_governor(tz, gov); |
| 210 | |
| 211 | exit: |
| 212 | mutex_unlock(&tz->lock); |
| 213 | mutex_unlock(&thermal_governor_lock); |
| 214 | |
| 215 | thermal_notify_tz_gov_change(tz, policy); |
| 216 | |
| 217 | return ret; |
| 218 | } |
| 219 | |
| 220 | int thermal_build_list_of_policies(char *buf) |
| 221 | { |
| 222 | struct thermal_governor *pos; |
| 223 | ssize_t count = 0; |
| 224 | |
| 225 | mutex_lock(&thermal_governor_lock); |
| 226 | |
| 227 | list_for_each_entry(pos, &thermal_governor_list, governor_list) { |
| 228 | count += sysfs_emit_at(buf, count, "%s ", pos->name); |
| 229 | } |
| 230 | count += sysfs_emit_at(buf, count, "\n"); |
| 231 | |
| 232 | mutex_unlock(&thermal_governor_lock); |
| 233 | |
| 234 | return count; |
| 235 | } |
| 236 | |
| 237 | static void __init thermal_unregister_governors(void) |
| 238 | { |
| 239 | struct thermal_governor **governor; |
| 240 | |
| 241 | for_each_governor_table(governor) |
| 242 | thermal_unregister_governor(*governor); |
| 243 | } |
| 244 | |
| 245 | static int __init thermal_register_governors(void) |
| 246 | { |
| 247 | int ret = 0; |
| 248 | struct thermal_governor **governor; |
| 249 | |
| 250 | for_each_governor_table(governor) { |
| 251 | ret = thermal_register_governor(*governor); |
| 252 | if (ret) { |
| 253 | pr_err("Failed to register governor: '%s'", |
| 254 | (*governor)->name); |
| 255 | break; |
| 256 | } |
| 257 | |
| 258 | pr_info("Registered thermal governor '%s'", |
| 259 | (*governor)->name); |
| 260 | } |
| 261 | |
| 262 | if (ret) { |
| 263 | struct thermal_governor **gov; |
| 264 | |
| 265 | for_each_governor_table(gov) { |
| 266 | if (gov == governor) |
| 267 | break; |
| 268 | thermal_unregister_governor(*gov); |
| 269 | } |
| 270 | } |
| 271 | |
| 272 | return ret; |
| 273 | } |
| 274 | |
| 275 | static int __thermal_zone_device_set_mode(struct thermal_zone_device *tz, |
| 276 | enum thermal_device_mode mode) |
| 277 | { |
| 278 | if (tz->ops.change_mode) { |
| 279 | int ret; |
| 280 | |
| 281 | ret = tz->ops.change_mode(tz, mode); |
| 282 | if (ret) |
| 283 | return ret; |
| 284 | } |
| 285 | |
| 286 | tz->mode = mode; |
| 287 | |
| 288 | return 0; |
| 289 | } |
| 290 | |
| 291 | static void thermal_zone_broken_disable(struct thermal_zone_device *tz) |
| 292 | { |
| 293 | struct thermal_trip_desc *td; |
| 294 | |
| 295 | dev_err(&tz->device, "Unable to get temperature, disabling!\n"); |
| 296 | /* |
| 297 | * This function only runs for enabled thermal zones, so no need to |
| 298 | * check for the current mode. |
| 299 | */ |
| 300 | __thermal_zone_device_set_mode(tz, THERMAL_DEVICE_DISABLED); |
| 301 | thermal_notify_tz_disable(tz); |
| 302 | |
| 303 | for_each_trip_desc(tz, td) { |
| 304 | if (td->trip.type == THERMAL_TRIP_CRITICAL && |
| 305 | td->trip.temperature > THERMAL_TEMP_INVALID) { |
| 306 | dev_crit(&tz->device, |
| 307 | "Disabled thermal zone with critical trip point\n"); |
| 308 | return; |
| 309 | } |
| 310 | } |
| 311 | } |
| 312 | |
| 313 | /* |
| 314 | * Zone update section: main control loop applied to each zone while monitoring |
| 315 | * in polling mode. The monitoring is done using a workqueue. |
| 316 | * Same update may be done on a zone by calling thermal_zone_device_update(). |
| 317 | * |
| 318 | * An update means: |
| 319 | * - Non-critical trips will invoke the governor responsible for that zone; |
| 320 | * - Hot trips will produce a notification to userspace; |
| 321 | * - Critical trip point will cause a system shutdown. |
| 322 | */ |
| 323 | static void thermal_zone_device_set_polling(struct thermal_zone_device *tz, |
| 324 | unsigned long delay) |
| 325 | { |
| 326 | if (delay > HZ) |
| 327 | delay = round_jiffies_relative(delay); |
| 328 | |
| 329 | mod_delayed_work(system_freezable_power_efficient_wq, &tz->poll_queue, delay); |
| 330 | } |
| 331 | |
| 332 | static void thermal_zone_recheck(struct thermal_zone_device *tz, int error) |
| 333 | { |
| 334 | if (error == -EAGAIN) { |
| 335 | thermal_zone_device_set_polling(tz, THERMAL_RECHECK_DELAY); |
| 336 | return; |
| 337 | } |
| 338 | |
| 339 | /* |
| 340 | * Print the message once to reduce log noise. It will be followed by |
| 341 | * another one if the temperature cannot be determined after multiple |
| 342 | * attempts. |
| 343 | */ |
| 344 | if (tz->recheck_delay_jiffies == THERMAL_RECHECK_DELAY) |
| 345 | dev_info(&tz->device, "Temperature check failed (%d)\n", error); |
| 346 | |
| 347 | thermal_zone_device_set_polling(tz, tz->recheck_delay_jiffies); |
| 348 | |
| 349 | tz->recheck_delay_jiffies += max(tz->recheck_delay_jiffies >> 1, 1ULL); |
| 350 | if (tz->recheck_delay_jiffies > THERMAL_MAX_RECHECK_DELAY) { |
| 351 | thermal_zone_broken_disable(tz); |
| 352 | /* |
| 353 | * Restore the original recheck delay value to allow the thermal |
| 354 | * zone to try to recover when it is reenabled by user space. |
| 355 | */ |
| 356 | tz->recheck_delay_jiffies = THERMAL_RECHECK_DELAY; |
| 357 | } |
| 358 | } |
| 359 | |
| 360 | static void monitor_thermal_zone(struct thermal_zone_device *tz) |
| 361 | { |
| 362 | if (tz->passive > 0 && tz->passive_delay_jiffies) |
| 363 | thermal_zone_device_set_polling(tz, tz->passive_delay_jiffies); |
| 364 | else if (tz->polling_delay_jiffies) |
| 365 | thermal_zone_device_set_polling(tz, tz->polling_delay_jiffies); |
| 366 | } |
| 367 | |
| 368 | static struct thermal_governor *thermal_get_tz_governor(struct thermal_zone_device *tz) |
| 369 | { |
| 370 | if (tz->governor) |
| 371 | return tz->governor; |
| 372 | |
| 373 | return def_governor; |
| 374 | } |
| 375 | |
| 376 | void thermal_governor_update_tz(struct thermal_zone_device *tz, |
| 377 | enum thermal_notify_event reason) |
| 378 | { |
| 379 | if (!tz->governor || !tz->governor->update_tz) |
| 380 | return; |
| 381 | |
| 382 | tz->governor->update_tz(tz, reason); |
| 383 | } |
| 384 | |
| 385 | static void thermal_zone_device_halt(struct thermal_zone_device *tz, bool shutdown) |
| 386 | { |
| 387 | /* |
| 388 | * poweroff_delay_ms must be a carefully profiled positive value. |
| 389 | * Its a must for forced_emergency_poweroff_work to be scheduled. |
| 390 | */ |
| 391 | int poweroff_delay_ms = CONFIG_THERMAL_EMERGENCY_POWEROFF_DELAY_MS; |
| 392 | const char *msg = "Temperature too high"; |
| 393 | |
| 394 | dev_emerg(&tz->device, "%s: critical temperature reached\n", tz->type); |
| 395 | |
| 396 | if (shutdown) |
| 397 | hw_protection_shutdown(msg, poweroff_delay_ms); |
| 398 | else |
| 399 | hw_protection_reboot(msg, poweroff_delay_ms); |
| 400 | } |
| 401 | |
| 402 | void thermal_zone_device_critical(struct thermal_zone_device *tz) |
| 403 | { |
| 404 | thermal_zone_device_halt(tz, true); |
| 405 | } |
| 406 | EXPORT_SYMBOL(thermal_zone_device_critical); |
| 407 | |
| 408 | void thermal_zone_device_critical_reboot(struct thermal_zone_device *tz) |
| 409 | { |
| 410 | thermal_zone_device_halt(tz, false); |
| 411 | } |
| 412 | |
| 413 | static void handle_critical_trips(struct thermal_zone_device *tz, |
| 414 | const struct thermal_trip *trip) |
| 415 | { |
| 416 | trace_thermal_zone_trip(tz, thermal_zone_trip_id(tz, trip), trip->type); |
| 417 | |
| 418 | if (trip->type == THERMAL_TRIP_CRITICAL) |
| 419 | tz->ops.critical(tz); |
| 420 | else if (tz->ops.hot) |
| 421 | tz->ops.hot(tz); |
| 422 | } |
| 423 | |
| 424 | static void handle_thermal_trip(struct thermal_zone_device *tz, |
| 425 | struct thermal_trip_desc *td, |
| 426 | struct list_head *way_up_list, |
| 427 | struct list_head *way_down_list) |
| 428 | { |
| 429 | const struct thermal_trip *trip = &td->trip; |
| 430 | int old_threshold; |
| 431 | |
| 432 | if (trip->temperature == THERMAL_TEMP_INVALID) |
| 433 | return; |
| 434 | |
| 435 | /* |
| 436 | * If the trip temperature or hysteresis has been updated recently, |
| 437 | * the threshold needs to be computed again using the new values. |
| 438 | * However, its initial value still reflects the old ones and that |
| 439 | * is what needs to be compared with the previous zone temperature |
| 440 | * to decide which action to take. |
| 441 | */ |
| 442 | old_threshold = td->threshold; |
| 443 | td->threshold = trip->temperature; |
| 444 | |
| 445 | if (tz->last_temperature >= old_threshold && |
| 446 | tz->last_temperature != THERMAL_TEMP_INIT) { |
| 447 | /* |
| 448 | * Mitigation is under way, so it needs to stop if the zone |
| 449 | * temperature falls below the low temperature of the trip. |
| 450 | * In that case, the trip temperature becomes the new threshold. |
| 451 | */ |
| 452 | if (tz->temperature < trip->temperature - trip->hysteresis) { |
| 453 | list_add(&td->notify_list_node, way_down_list); |
| 454 | td->notify_temp = trip->temperature - trip->hysteresis; |
| 455 | |
| 456 | if (trip->type == THERMAL_TRIP_PASSIVE) { |
| 457 | tz->passive--; |
| 458 | WARN_ON(tz->passive < 0); |
| 459 | } |
| 460 | } else { |
| 461 | td->threshold -= trip->hysteresis; |
| 462 | } |
| 463 | } else if (tz->temperature >= trip->temperature) { |
| 464 | /* |
| 465 | * There is no mitigation under way, so it needs to be started |
| 466 | * if the zone temperature exceeds the trip one. The new |
| 467 | * threshold is then set to the low temperature of the trip. |
| 468 | */ |
| 469 | list_add_tail(&td->notify_list_node, way_up_list); |
| 470 | td->notify_temp = trip->temperature; |
| 471 | td->threshold -= trip->hysteresis; |
| 472 | |
| 473 | if (trip->type == THERMAL_TRIP_PASSIVE) |
| 474 | tz->passive++; |
| 475 | else if (trip->type == THERMAL_TRIP_CRITICAL || |
| 476 | trip->type == THERMAL_TRIP_HOT) |
| 477 | handle_critical_trips(tz, trip); |
| 478 | } |
| 479 | } |
| 480 | |
| 481 | static void thermal_zone_device_check(struct work_struct *work) |
| 482 | { |
| 483 | struct thermal_zone_device *tz = container_of(work, struct |
| 484 | thermal_zone_device, |
| 485 | poll_queue.work); |
| 486 | thermal_zone_device_update(tz, THERMAL_EVENT_UNSPECIFIED); |
| 487 | } |
| 488 | |
| 489 | static void thermal_zone_device_init(struct thermal_zone_device *tz) |
| 490 | { |
| 491 | struct thermal_instance *pos; |
| 492 | |
| 493 | INIT_DELAYED_WORK(&tz->poll_queue, thermal_zone_device_check); |
| 494 | |
| 495 | tz->temperature = THERMAL_TEMP_INIT; |
| 496 | tz->passive = 0; |
| 497 | tz->prev_low_trip = -INT_MAX; |
| 498 | tz->prev_high_trip = INT_MAX; |
| 499 | list_for_each_entry(pos, &tz->thermal_instances, tz_node) |
| 500 | pos->initialized = false; |
| 501 | } |
| 502 | |
| 503 | static void thermal_governor_trip_crossed(struct thermal_governor *governor, |
| 504 | struct thermal_zone_device *tz, |
| 505 | const struct thermal_trip *trip, |
| 506 | bool crossed_up) |
| 507 | { |
| 508 | if (trip->type == THERMAL_TRIP_HOT || trip->type == THERMAL_TRIP_CRITICAL) |
| 509 | return; |
| 510 | |
| 511 | if (governor->trip_crossed) |
| 512 | governor->trip_crossed(tz, trip, crossed_up); |
| 513 | } |
| 514 | |
| 515 | static void thermal_trip_crossed(struct thermal_zone_device *tz, |
| 516 | const struct thermal_trip *trip, |
| 517 | struct thermal_governor *governor, |
| 518 | bool crossed_up) |
| 519 | { |
| 520 | if (crossed_up) { |
| 521 | thermal_notify_tz_trip_up(tz, trip); |
| 522 | thermal_debug_tz_trip_up(tz, trip); |
| 523 | } else { |
| 524 | thermal_notify_tz_trip_down(tz, trip); |
| 525 | thermal_debug_tz_trip_down(tz, trip); |
| 526 | } |
| 527 | thermal_governor_trip_crossed(governor, tz, trip, crossed_up); |
| 528 | } |
| 529 | |
| 530 | static int thermal_trip_notify_cmp(void *not_used, const struct list_head *a, |
| 531 | const struct list_head *b) |
| 532 | { |
| 533 | struct thermal_trip_desc *tda = container_of(a, struct thermal_trip_desc, |
| 534 | notify_list_node); |
| 535 | struct thermal_trip_desc *tdb = container_of(b, struct thermal_trip_desc, |
| 536 | notify_list_node); |
| 537 | return tda->notify_temp - tdb->notify_temp; |
| 538 | } |
| 539 | |
| 540 | void __thermal_zone_device_update(struct thermal_zone_device *tz, |
| 541 | enum thermal_notify_event event) |
| 542 | { |
| 543 | struct thermal_governor *governor = thermal_get_tz_governor(tz); |
| 544 | struct thermal_trip_desc *td; |
| 545 | LIST_HEAD(way_down_list); |
| 546 | LIST_HEAD(way_up_list); |
| 547 | int low = -INT_MAX, high = INT_MAX; |
| 548 | int temp, ret; |
| 549 | |
| 550 | if (tz->suspended || tz->mode != THERMAL_DEVICE_ENABLED) |
| 551 | return; |
| 552 | |
| 553 | ret = __thermal_zone_get_temp(tz, &temp); |
| 554 | if (ret) { |
| 555 | thermal_zone_recheck(tz, ret); |
| 556 | return; |
| 557 | } else if (temp <= THERMAL_TEMP_INVALID) { |
| 558 | /* |
| 559 | * Special case: No valid temperature value is available, but |
| 560 | * the zone owner does not want the core to do anything about |
| 561 | * it. Continue regular zone polling if needed, so that this |
| 562 | * function can be called again, but skip everything else. |
| 563 | */ |
| 564 | goto monitor; |
| 565 | } |
| 566 | |
| 567 | tz->recheck_delay_jiffies = THERMAL_RECHECK_DELAY; |
| 568 | |
| 569 | tz->last_temperature = tz->temperature; |
| 570 | tz->temperature = temp; |
| 571 | |
| 572 | trace_thermal_temperature(tz); |
| 573 | |
| 574 | thermal_genl_sampling_temp(tz->id, temp); |
| 575 | |
| 576 | tz->notify_event = event; |
| 577 | |
| 578 | for_each_trip_desc(tz, td) { |
| 579 | handle_thermal_trip(tz, td, &way_up_list, &way_down_list); |
| 580 | |
| 581 | if (td->threshold <= tz->temperature && td->threshold > low) |
| 582 | low = td->threshold; |
| 583 | |
| 584 | if (td->threshold >= tz->temperature && td->threshold < high) |
| 585 | high = td->threshold; |
| 586 | } |
| 587 | |
| 588 | thermal_zone_set_trips(tz, low, high); |
| 589 | |
| 590 | list_sort(NULL, &way_up_list, thermal_trip_notify_cmp); |
| 591 | list_for_each_entry(td, &way_up_list, notify_list_node) |
| 592 | thermal_trip_crossed(tz, &td->trip, governor, true); |
| 593 | |
| 594 | list_sort(NULL, &way_down_list, thermal_trip_notify_cmp); |
| 595 | list_for_each_entry_reverse(td, &way_down_list, notify_list_node) |
| 596 | thermal_trip_crossed(tz, &td->trip, governor, false); |
| 597 | |
| 598 | if (governor->manage) |
| 599 | governor->manage(tz); |
| 600 | |
| 601 | thermal_debug_update_trip_stats(tz); |
| 602 | |
| 603 | monitor: |
| 604 | monitor_thermal_zone(tz); |
| 605 | } |
| 606 | |
| 607 | static int thermal_zone_device_set_mode(struct thermal_zone_device *tz, |
| 608 | enum thermal_device_mode mode) |
| 609 | { |
| 610 | int ret; |
| 611 | |
| 612 | mutex_lock(&tz->lock); |
| 613 | |
| 614 | /* do nothing if mode isn't changing */ |
| 615 | if (mode == tz->mode) { |
| 616 | mutex_unlock(&tz->lock); |
| 617 | |
| 618 | return 0; |
| 619 | } |
| 620 | |
| 621 | ret = __thermal_zone_device_set_mode(tz, mode); |
| 622 | if (ret) { |
| 623 | mutex_unlock(&tz->lock); |
| 624 | |
| 625 | return ret; |
| 626 | } |
| 627 | |
| 628 | __thermal_zone_device_update(tz, THERMAL_EVENT_UNSPECIFIED); |
| 629 | |
| 630 | mutex_unlock(&tz->lock); |
| 631 | |
| 632 | if (mode == THERMAL_DEVICE_ENABLED) |
| 633 | thermal_notify_tz_enable(tz); |
| 634 | else |
| 635 | thermal_notify_tz_disable(tz); |
| 636 | |
| 637 | return 0; |
| 638 | } |
| 639 | |
| 640 | int thermal_zone_device_enable(struct thermal_zone_device *tz) |
| 641 | { |
| 642 | return thermal_zone_device_set_mode(tz, THERMAL_DEVICE_ENABLED); |
| 643 | } |
| 644 | EXPORT_SYMBOL_GPL(thermal_zone_device_enable); |
| 645 | |
| 646 | int thermal_zone_device_disable(struct thermal_zone_device *tz) |
| 647 | { |
| 648 | return thermal_zone_device_set_mode(tz, THERMAL_DEVICE_DISABLED); |
| 649 | } |
| 650 | EXPORT_SYMBOL_GPL(thermal_zone_device_disable); |
| 651 | |
| 652 | static bool thermal_zone_is_present(struct thermal_zone_device *tz) |
| 653 | { |
| 654 | return !list_empty(&tz->node); |
| 655 | } |
| 656 | |
| 657 | void thermal_zone_device_update(struct thermal_zone_device *tz, |
| 658 | enum thermal_notify_event event) |
| 659 | { |
| 660 | mutex_lock(&tz->lock); |
| 661 | if (thermal_zone_is_present(tz)) |
| 662 | __thermal_zone_device_update(tz, event); |
| 663 | mutex_unlock(&tz->lock); |
| 664 | } |
| 665 | EXPORT_SYMBOL_GPL(thermal_zone_device_update); |
| 666 | |
| 667 | void thermal_zone_trip_down(struct thermal_zone_device *tz, |
| 668 | const struct thermal_trip *trip) |
| 669 | { |
| 670 | thermal_trip_crossed(tz, trip, thermal_get_tz_governor(tz), false); |
| 671 | } |
| 672 | |
| 673 | int for_each_thermal_governor(int (*cb)(struct thermal_governor *, void *), |
| 674 | void *data) |
| 675 | { |
| 676 | struct thermal_governor *gov; |
| 677 | int ret = 0; |
| 678 | |
| 679 | mutex_lock(&thermal_governor_lock); |
| 680 | list_for_each_entry(gov, &thermal_governor_list, governor_list) { |
| 681 | ret = cb(gov, data); |
| 682 | if (ret) |
| 683 | break; |
| 684 | } |
| 685 | mutex_unlock(&thermal_governor_lock); |
| 686 | |
| 687 | return ret; |
| 688 | } |
| 689 | |
| 690 | int for_each_thermal_cooling_device(int (*cb)(struct thermal_cooling_device *, |
| 691 | void *), void *data) |
| 692 | { |
| 693 | struct thermal_cooling_device *cdev; |
| 694 | int ret = 0; |
| 695 | |
| 696 | mutex_lock(&thermal_list_lock); |
| 697 | list_for_each_entry(cdev, &thermal_cdev_list, node) { |
| 698 | ret = cb(cdev, data); |
| 699 | if (ret) |
| 700 | break; |
| 701 | } |
| 702 | mutex_unlock(&thermal_list_lock); |
| 703 | |
| 704 | return ret; |
| 705 | } |
| 706 | |
| 707 | int for_each_thermal_zone(int (*cb)(struct thermal_zone_device *, void *), |
| 708 | void *data) |
| 709 | { |
| 710 | struct thermal_zone_device *tz; |
| 711 | int ret = 0; |
| 712 | |
| 713 | mutex_lock(&thermal_list_lock); |
| 714 | list_for_each_entry(tz, &thermal_tz_list, node) { |
| 715 | ret = cb(tz, data); |
| 716 | if (ret) |
| 717 | break; |
| 718 | } |
| 719 | mutex_unlock(&thermal_list_lock); |
| 720 | |
| 721 | return ret; |
| 722 | } |
| 723 | |
| 724 | struct thermal_zone_device *thermal_zone_get_by_id(int id) |
| 725 | { |
| 726 | struct thermal_zone_device *tz, *match = NULL; |
| 727 | |
| 728 | mutex_lock(&thermal_list_lock); |
| 729 | list_for_each_entry(tz, &thermal_tz_list, node) { |
| 730 | if (tz->id == id) { |
| 731 | match = tz; |
| 732 | break; |
| 733 | } |
| 734 | } |
| 735 | mutex_unlock(&thermal_list_lock); |
| 736 | |
| 737 | return match; |
| 738 | } |
| 739 | |
| 740 | /* |
| 741 | * Device management section: cooling devices, zones devices, and binding |
| 742 | * |
| 743 | * Set of functions provided by the thermal core for: |
| 744 | * - cooling devices lifecycle: registration, unregistration, |
| 745 | * binding, and unbinding. |
| 746 | * - thermal zone devices lifecycle: registration, unregistration, |
| 747 | * binding, and unbinding. |
| 748 | */ |
| 749 | |
| 750 | /** |
| 751 | * thermal_bind_cdev_to_trip - bind a cooling device to a thermal zone |
| 752 | * @tz: pointer to struct thermal_zone_device |
| 753 | * @trip: trip point the cooling devices is associated with in this zone. |
| 754 | * @cdev: pointer to struct thermal_cooling_device |
| 755 | * @cool_spec: cooling specification for @trip and @cdev |
| 756 | * |
| 757 | * This interface function bind a thermal cooling device to the certain trip |
| 758 | * point of a thermal zone device. |
| 759 | * This function is usually called in the thermal zone device .bind callback. |
| 760 | * |
| 761 | * Return: 0 on success, the proper error value otherwise. |
| 762 | */ |
| 763 | static int thermal_bind_cdev_to_trip(struct thermal_zone_device *tz, |
| 764 | const struct thermal_trip *trip, |
| 765 | struct thermal_cooling_device *cdev, |
| 766 | struct cooling_spec *cool_spec) |
| 767 | { |
| 768 | struct thermal_instance *dev; |
| 769 | struct thermal_instance *pos; |
| 770 | bool upper_no_limit; |
| 771 | int result; |
| 772 | |
| 773 | /* lower default 0, upper default max_state */ |
| 774 | if (cool_spec->lower == THERMAL_NO_LIMIT) |
| 775 | cool_spec->lower = 0; |
| 776 | |
| 777 | if (cool_spec->upper == THERMAL_NO_LIMIT) { |
| 778 | cool_spec->upper = cdev->max_state; |
| 779 | upper_no_limit = true; |
| 780 | } else { |
| 781 | upper_no_limit = false; |
| 782 | } |
| 783 | |
| 784 | if (cool_spec->lower > cool_spec->upper || cool_spec->upper > cdev->max_state) |
| 785 | return -EINVAL; |
| 786 | |
| 787 | dev = kzalloc(sizeof(*dev), GFP_KERNEL); |
| 788 | if (!dev) |
| 789 | return -ENOMEM; |
| 790 | |
| 791 | dev->cdev = cdev; |
| 792 | dev->trip = trip; |
| 793 | dev->upper = cool_spec->upper; |
| 794 | dev->upper_no_limit = upper_no_limit; |
| 795 | dev->lower = cool_spec->lower; |
| 796 | dev->target = THERMAL_NO_TARGET; |
| 797 | dev->weight = cool_spec->weight; |
| 798 | |
| 799 | result = ida_alloc(&tz->ida, GFP_KERNEL); |
| 800 | if (result < 0) |
| 801 | goto free_mem; |
| 802 | |
| 803 | dev->id = result; |
| 804 | sprintf(dev->name, "cdev%d", dev->id); |
| 805 | result = |
| 806 | sysfs_create_link(&tz->device.kobj, &cdev->device.kobj, dev->name); |
| 807 | if (result) |
| 808 | goto release_ida; |
| 809 | |
| 810 | snprintf(dev->attr_name, sizeof(dev->attr_name), "cdev%d_trip_point", |
| 811 | dev->id); |
| 812 | sysfs_attr_init(&dev->attr.attr); |
| 813 | dev->attr.attr.name = dev->attr_name; |
| 814 | dev->attr.attr.mode = 0444; |
| 815 | dev->attr.show = trip_point_show; |
| 816 | result = device_create_file(&tz->device, &dev->attr); |
| 817 | if (result) |
| 818 | goto remove_symbol_link; |
| 819 | |
| 820 | snprintf(dev->weight_attr_name, sizeof(dev->weight_attr_name), |
| 821 | "cdev%d_weight", dev->id); |
| 822 | sysfs_attr_init(&dev->weight_attr.attr); |
| 823 | dev->weight_attr.attr.name = dev->weight_attr_name; |
| 824 | dev->weight_attr.attr.mode = S_IWUSR | S_IRUGO; |
| 825 | dev->weight_attr.show = weight_show; |
| 826 | dev->weight_attr.store = weight_store; |
| 827 | result = device_create_file(&tz->device, &dev->weight_attr); |
| 828 | if (result) |
| 829 | goto remove_trip_file; |
| 830 | |
| 831 | mutex_lock(&cdev->lock); |
| 832 | list_for_each_entry(pos, &tz->thermal_instances, tz_node) |
| 833 | if (pos->trip == trip && pos->cdev == cdev) { |
| 834 | result = -EEXIST; |
| 835 | break; |
| 836 | } |
| 837 | if (!result) { |
| 838 | list_add_tail(&dev->tz_node, &tz->thermal_instances); |
| 839 | list_add_tail(&dev->cdev_node, &cdev->thermal_instances); |
| 840 | atomic_set(&tz->need_update, 1); |
| 841 | |
| 842 | thermal_governor_update_tz(tz, THERMAL_TZ_BIND_CDEV); |
| 843 | } |
| 844 | mutex_unlock(&cdev->lock); |
| 845 | |
| 846 | if (!result) |
| 847 | return 0; |
| 848 | |
| 849 | device_remove_file(&tz->device, &dev->weight_attr); |
| 850 | remove_trip_file: |
| 851 | device_remove_file(&tz->device, &dev->attr); |
| 852 | remove_symbol_link: |
| 853 | sysfs_remove_link(&tz->device.kobj, dev->name); |
| 854 | release_ida: |
| 855 | ida_free(&tz->ida, dev->id); |
| 856 | free_mem: |
| 857 | kfree(dev); |
| 858 | return result; |
| 859 | } |
| 860 | |
| 861 | /** |
| 862 | * thermal_unbind_cdev_from_trip - unbind a cooling device from a thermal zone. |
| 863 | * @tz: pointer to a struct thermal_zone_device. |
| 864 | * @trip: trip point the cooling devices is associated with in this zone. |
| 865 | * @cdev: pointer to a struct thermal_cooling_device. |
| 866 | * |
| 867 | * This interface function unbind a thermal cooling device from the certain |
| 868 | * trip point of a thermal zone device. |
| 869 | * This function is usually called in the thermal zone device .unbind callback. |
| 870 | */ |
| 871 | static void thermal_unbind_cdev_from_trip(struct thermal_zone_device *tz, |
| 872 | const struct thermal_trip *trip, |
| 873 | struct thermal_cooling_device *cdev) |
| 874 | { |
| 875 | struct thermal_instance *pos, *next; |
| 876 | |
| 877 | mutex_lock(&cdev->lock); |
| 878 | list_for_each_entry_safe(pos, next, &tz->thermal_instances, tz_node) { |
| 879 | if (pos->trip == trip && pos->cdev == cdev) { |
| 880 | list_del(&pos->tz_node); |
| 881 | list_del(&pos->cdev_node); |
| 882 | |
| 883 | thermal_governor_update_tz(tz, THERMAL_TZ_UNBIND_CDEV); |
| 884 | |
| 885 | mutex_unlock(&cdev->lock); |
| 886 | goto unbind; |
| 887 | } |
| 888 | } |
| 889 | mutex_unlock(&cdev->lock); |
| 890 | |
| 891 | return; |
| 892 | |
| 893 | unbind: |
| 894 | device_remove_file(&tz->device, &pos->weight_attr); |
| 895 | device_remove_file(&tz->device, &pos->attr); |
| 896 | sysfs_remove_link(&tz->device.kobj, pos->name); |
| 897 | ida_free(&tz->ida, pos->id); |
| 898 | kfree(pos); |
| 899 | } |
| 900 | |
| 901 | static void thermal_release(struct device *dev) |
| 902 | { |
| 903 | struct thermal_zone_device *tz; |
| 904 | struct thermal_cooling_device *cdev; |
| 905 | |
| 906 | if (!strncmp(dev_name(dev), "thermal_zone", |
| 907 | sizeof("thermal_zone") - 1)) { |
| 908 | tz = to_thermal_zone(dev); |
| 909 | thermal_zone_destroy_device_groups(tz); |
| 910 | mutex_destroy(&tz->lock); |
| 911 | complete(&tz->removal); |
| 912 | } else if (!strncmp(dev_name(dev), "cooling_device", |
| 913 | sizeof("cooling_device") - 1)) { |
| 914 | cdev = to_cooling_device(dev); |
| 915 | thermal_cooling_device_destroy_sysfs(cdev); |
| 916 | kfree_const(cdev->type); |
| 917 | ida_free(&thermal_cdev_ida, cdev->id); |
| 918 | kfree(cdev); |
| 919 | } |
| 920 | } |
| 921 | |
| 922 | static struct class *thermal_class; |
| 923 | |
| 924 | static inline |
| 925 | void print_bind_err_msg(struct thermal_zone_device *tz, |
| 926 | const struct thermal_trip *trip, |
| 927 | struct thermal_cooling_device *cdev, int ret) |
| 928 | { |
| 929 | dev_err(&tz->device, "binding cdev %s to trip %d failed: %d\n", |
| 930 | cdev->type, thermal_zone_trip_id(tz, trip), ret); |
| 931 | } |
| 932 | |
| 933 | static void thermal_zone_cdev_bind(struct thermal_zone_device *tz, |
| 934 | struct thermal_cooling_device *cdev) |
| 935 | { |
| 936 | struct thermal_trip_desc *td; |
| 937 | |
| 938 | if (!tz->ops.should_bind) |
| 939 | return; |
| 940 | |
| 941 | mutex_lock(&tz->lock); |
| 942 | |
| 943 | for_each_trip_desc(tz, td) { |
| 944 | struct thermal_trip *trip = &td->trip; |
| 945 | struct cooling_spec c = { |
| 946 | .upper = THERMAL_NO_LIMIT, |
| 947 | .lower = THERMAL_NO_LIMIT, |
| 948 | .weight = THERMAL_WEIGHT_DEFAULT |
| 949 | }; |
| 950 | int ret; |
| 951 | |
| 952 | if (!tz->ops.should_bind(tz, trip, cdev, &c)) |
| 953 | continue; |
| 954 | |
| 955 | ret = thermal_bind_cdev_to_trip(tz, trip, cdev, &c); |
| 956 | if (ret) |
| 957 | print_bind_err_msg(tz, trip, cdev, ret); |
| 958 | } |
| 959 | |
| 960 | mutex_unlock(&tz->lock); |
| 961 | } |
| 962 | |
| 963 | /** |
| 964 | * __thermal_cooling_device_register() - register a new thermal cooling device |
| 965 | * @np: a pointer to a device tree node. |
| 966 | * @type: the thermal cooling device type. |
| 967 | * @devdata: device private data. |
| 968 | * @ops: standard thermal cooling devices callbacks. |
| 969 | * |
| 970 | * This interface function adds a new thermal cooling device (fan/processor/...) |
| 971 | * to /sys/class/thermal/ folder as cooling_device[0-*]. It tries to bind itself |
| 972 | * to all the thermal zone devices registered at the same time. |
| 973 | * It also gives the opportunity to link the cooling device to a device tree |
| 974 | * node, so that it can be bound to a thermal zone created out of device tree. |
| 975 | * |
| 976 | * Return: a pointer to the created struct thermal_cooling_device or an |
| 977 | * ERR_PTR. Caller must check return value with IS_ERR*() helpers. |
| 978 | */ |
| 979 | static struct thermal_cooling_device * |
| 980 | __thermal_cooling_device_register(struct device_node *np, |
| 981 | const char *type, void *devdata, |
| 982 | const struct thermal_cooling_device_ops *ops) |
| 983 | { |
| 984 | struct thermal_cooling_device *cdev; |
| 985 | struct thermal_zone_device *pos = NULL; |
| 986 | unsigned long current_state; |
| 987 | int id, ret; |
| 988 | |
| 989 | if (!ops || !ops->get_max_state || !ops->get_cur_state || |
| 990 | !ops->set_cur_state) |
| 991 | return ERR_PTR(-EINVAL); |
| 992 | |
| 993 | if (!thermal_class) |
| 994 | return ERR_PTR(-ENODEV); |
| 995 | |
| 996 | cdev = kzalloc(sizeof(*cdev), GFP_KERNEL); |
| 997 | if (!cdev) |
| 998 | return ERR_PTR(-ENOMEM); |
| 999 | |
| 1000 | ret = ida_alloc(&thermal_cdev_ida, GFP_KERNEL); |
| 1001 | if (ret < 0) |
| 1002 | goto out_kfree_cdev; |
| 1003 | cdev->id = ret; |
| 1004 | id = ret; |
| 1005 | |
| 1006 | cdev->type = kstrdup_const(type ? type : "", GFP_KERNEL); |
| 1007 | if (!cdev->type) { |
| 1008 | ret = -ENOMEM; |
| 1009 | goto out_ida_remove; |
| 1010 | } |
| 1011 | |
| 1012 | mutex_init(&cdev->lock); |
| 1013 | INIT_LIST_HEAD(&cdev->thermal_instances); |
| 1014 | cdev->np = np; |
| 1015 | cdev->ops = ops; |
| 1016 | cdev->updated = false; |
| 1017 | cdev->device.class = thermal_class; |
| 1018 | cdev->devdata = devdata; |
| 1019 | |
| 1020 | ret = cdev->ops->get_max_state(cdev, &cdev->max_state); |
| 1021 | if (ret) |
| 1022 | goto out_cdev_type; |
| 1023 | |
| 1024 | /* |
| 1025 | * The cooling device's current state is only needed for debug |
| 1026 | * initialization below, so a failure to get it does not cause |
| 1027 | * the entire cooling device initialization to fail. However, |
| 1028 | * the debug will not work for the device if its initial state |
| 1029 | * cannot be determined and drivers are responsible for ensuring |
| 1030 | * that this will not happen. |
| 1031 | */ |
| 1032 | ret = cdev->ops->get_cur_state(cdev, ¤t_state); |
| 1033 | if (ret) |
| 1034 | current_state = ULONG_MAX; |
| 1035 | |
| 1036 | thermal_cooling_device_setup_sysfs(cdev); |
| 1037 | |
| 1038 | ret = dev_set_name(&cdev->device, "cooling_device%d", cdev->id); |
| 1039 | if (ret) |
| 1040 | goto out_cooling_dev; |
| 1041 | |
| 1042 | ret = device_register(&cdev->device); |
| 1043 | if (ret) { |
| 1044 | /* thermal_release() handles rest of the cleanup */ |
| 1045 | put_device(&cdev->device); |
| 1046 | return ERR_PTR(ret); |
| 1047 | } |
| 1048 | |
| 1049 | if (current_state <= cdev->max_state) |
| 1050 | thermal_debug_cdev_add(cdev, current_state); |
| 1051 | |
| 1052 | /* Add 'this' new cdev to the global cdev list */ |
| 1053 | mutex_lock(&thermal_list_lock); |
| 1054 | |
| 1055 | list_add(&cdev->node, &thermal_cdev_list); |
| 1056 | |
| 1057 | /* Update binding information for 'this' new cdev */ |
| 1058 | list_for_each_entry(pos, &thermal_tz_list, node) |
| 1059 | thermal_zone_cdev_bind(pos, cdev); |
| 1060 | |
| 1061 | list_for_each_entry(pos, &thermal_tz_list, node) |
| 1062 | if (atomic_cmpxchg(&pos->need_update, 1, 0)) |
| 1063 | thermal_zone_device_update(pos, |
| 1064 | THERMAL_EVENT_UNSPECIFIED); |
| 1065 | |
| 1066 | mutex_unlock(&thermal_list_lock); |
| 1067 | |
| 1068 | return cdev; |
| 1069 | |
| 1070 | out_cooling_dev: |
| 1071 | thermal_cooling_device_destroy_sysfs(cdev); |
| 1072 | out_cdev_type: |
| 1073 | kfree_const(cdev->type); |
| 1074 | out_ida_remove: |
| 1075 | ida_free(&thermal_cdev_ida, id); |
| 1076 | out_kfree_cdev: |
| 1077 | kfree(cdev); |
| 1078 | return ERR_PTR(ret); |
| 1079 | } |
| 1080 | |
| 1081 | /** |
| 1082 | * thermal_cooling_device_register() - register a new thermal cooling device |
| 1083 | * @type: the thermal cooling device type. |
| 1084 | * @devdata: device private data. |
| 1085 | * @ops: standard thermal cooling devices callbacks. |
| 1086 | * |
| 1087 | * This interface function adds a new thermal cooling device (fan/processor/...) |
| 1088 | * to /sys/class/thermal/ folder as cooling_device[0-*]. It tries to bind itself |
| 1089 | * to all the thermal zone devices registered at the same time. |
| 1090 | * |
| 1091 | * Return: a pointer to the created struct thermal_cooling_device or an |
| 1092 | * ERR_PTR. Caller must check return value with IS_ERR*() helpers. |
| 1093 | */ |
| 1094 | struct thermal_cooling_device * |
| 1095 | thermal_cooling_device_register(const char *type, void *devdata, |
| 1096 | const struct thermal_cooling_device_ops *ops) |
| 1097 | { |
| 1098 | return __thermal_cooling_device_register(NULL, type, devdata, ops); |
| 1099 | } |
| 1100 | EXPORT_SYMBOL_GPL(thermal_cooling_device_register); |
| 1101 | |
| 1102 | /** |
| 1103 | * thermal_of_cooling_device_register() - register an OF thermal cooling device |
| 1104 | * @np: a pointer to a device tree node. |
| 1105 | * @type: the thermal cooling device type. |
| 1106 | * @devdata: device private data. |
| 1107 | * @ops: standard thermal cooling devices callbacks. |
| 1108 | * |
| 1109 | * This function will register a cooling device with device tree node reference. |
| 1110 | * This interface function adds a new thermal cooling device (fan/processor/...) |
| 1111 | * to /sys/class/thermal/ folder as cooling_device[0-*]. It tries to bind itself |
| 1112 | * to all the thermal zone devices registered at the same time. |
| 1113 | * |
| 1114 | * Return: a pointer to the created struct thermal_cooling_device or an |
| 1115 | * ERR_PTR. Caller must check return value with IS_ERR*() helpers. |
| 1116 | */ |
| 1117 | struct thermal_cooling_device * |
| 1118 | thermal_of_cooling_device_register(struct device_node *np, |
| 1119 | const char *type, void *devdata, |
| 1120 | const struct thermal_cooling_device_ops *ops) |
| 1121 | { |
| 1122 | return __thermal_cooling_device_register(np, type, devdata, ops); |
| 1123 | } |
| 1124 | EXPORT_SYMBOL_GPL(thermal_of_cooling_device_register); |
| 1125 | |
| 1126 | static void thermal_cooling_device_release(struct device *dev, void *res) |
| 1127 | { |
| 1128 | thermal_cooling_device_unregister( |
| 1129 | *(struct thermal_cooling_device **)res); |
| 1130 | } |
| 1131 | |
| 1132 | /** |
| 1133 | * devm_thermal_of_cooling_device_register() - register an OF thermal cooling |
| 1134 | * device |
| 1135 | * @dev: a valid struct device pointer of a sensor device. |
| 1136 | * @np: a pointer to a device tree node. |
| 1137 | * @type: the thermal cooling device type. |
| 1138 | * @devdata: device private data. |
| 1139 | * @ops: standard thermal cooling devices callbacks. |
| 1140 | * |
| 1141 | * This function will register a cooling device with device tree node reference. |
| 1142 | * This interface function adds a new thermal cooling device (fan/processor/...) |
| 1143 | * to /sys/class/thermal/ folder as cooling_device[0-*]. It tries to bind itself |
| 1144 | * to all the thermal zone devices registered at the same time. |
| 1145 | * |
| 1146 | * Return: a pointer to the created struct thermal_cooling_device or an |
| 1147 | * ERR_PTR. Caller must check return value with IS_ERR*() helpers. |
| 1148 | */ |
| 1149 | struct thermal_cooling_device * |
| 1150 | devm_thermal_of_cooling_device_register(struct device *dev, |
| 1151 | struct device_node *np, |
| 1152 | const char *type, void *devdata, |
| 1153 | const struct thermal_cooling_device_ops *ops) |
| 1154 | { |
| 1155 | struct thermal_cooling_device **ptr, *tcd; |
| 1156 | |
| 1157 | ptr = devres_alloc(thermal_cooling_device_release, sizeof(*ptr), |
| 1158 | GFP_KERNEL); |
| 1159 | if (!ptr) |
| 1160 | return ERR_PTR(-ENOMEM); |
| 1161 | |
| 1162 | tcd = __thermal_cooling_device_register(np, type, devdata, ops); |
| 1163 | if (IS_ERR(tcd)) { |
| 1164 | devres_free(ptr); |
| 1165 | return tcd; |
| 1166 | } |
| 1167 | |
| 1168 | *ptr = tcd; |
| 1169 | devres_add(dev, ptr); |
| 1170 | |
| 1171 | return tcd; |
| 1172 | } |
| 1173 | EXPORT_SYMBOL_GPL(devm_thermal_of_cooling_device_register); |
| 1174 | |
| 1175 | static bool thermal_cooling_device_present(struct thermal_cooling_device *cdev) |
| 1176 | { |
| 1177 | struct thermal_cooling_device *pos = NULL; |
| 1178 | |
| 1179 | list_for_each_entry(pos, &thermal_cdev_list, node) { |
| 1180 | if (pos == cdev) |
| 1181 | return true; |
| 1182 | } |
| 1183 | |
| 1184 | return false; |
| 1185 | } |
| 1186 | |
| 1187 | /** |
| 1188 | * thermal_cooling_device_update - Update a cooling device object |
| 1189 | * @cdev: Target cooling device. |
| 1190 | * |
| 1191 | * Update @cdev to reflect a change of the underlying hardware or platform. |
| 1192 | * |
| 1193 | * Must be called when the maximum cooling state of @cdev becomes invalid and so |
| 1194 | * its .get_max_state() callback needs to be run to produce the new maximum |
| 1195 | * cooling state value. |
| 1196 | */ |
| 1197 | void thermal_cooling_device_update(struct thermal_cooling_device *cdev) |
| 1198 | { |
| 1199 | struct thermal_instance *ti; |
| 1200 | unsigned long state; |
| 1201 | |
| 1202 | if (IS_ERR_OR_NULL(cdev)) |
| 1203 | return; |
| 1204 | |
| 1205 | /* |
| 1206 | * Hold thermal_list_lock throughout the update to prevent the device |
| 1207 | * from going away while being updated. |
| 1208 | */ |
| 1209 | mutex_lock(&thermal_list_lock); |
| 1210 | |
| 1211 | if (!thermal_cooling_device_present(cdev)) |
| 1212 | goto unlock_list; |
| 1213 | |
| 1214 | /* |
| 1215 | * Update under the cdev lock to prevent the state from being set beyond |
| 1216 | * the new limit concurrently. |
| 1217 | */ |
| 1218 | mutex_lock(&cdev->lock); |
| 1219 | |
| 1220 | if (cdev->ops->get_max_state(cdev, &cdev->max_state)) |
| 1221 | goto unlock; |
| 1222 | |
| 1223 | thermal_cooling_device_stats_reinit(cdev); |
| 1224 | |
| 1225 | list_for_each_entry(ti, &cdev->thermal_instances, cdev_node) { |
| 1226 | if (ti->upper == cdev->max_state) |
| 1227 | continue; |
| 1228 | |
| 1229 | if (ti->upper < cdev->max_state) { |
| 1230 | if (ti->upper_no_limit) |
| 1231 | ti->upper = cdev->max_state; |
| 1232 | |
| 1233 | continue; |
| 1234 | } |
| 1235 | |
| 1236 | ti->upper = cdev->max_state; |
| 1237 | if (ti->lower > ti->upper) |
| 1238 | ti->lower = ti->upper; |
| 1239 | |
| 1240 | if (ti->target == THERMAL_NO_TARGET) |
| 1241 | continue; |
| 1242 | |
| 1243 | if (ti->target > ti->upper) |
| 1244 | ti->target = ti->upper; |
| 1245 | } |
| 1246 | |
| 1247 | if (cdev->ops->get_cur_state(cdev, &state) || state > cdev->max_state) |
| 1248 | goto unlock; |
| 1249 | |
| 1250 | thermal_cooling_device_stats_update(cdev, state); |
| 1251 | |
| 1252 | unlock: |
| 1253 | mutex_unlock(&cdev->lock); |
| 1254 | |
| 1255 | unlock_list: |
| 1256 | mutex_unlock(&thermal_list_lock); |
| 1257 | } |
| 1258 | EXPORT_SYMBOL_GPL(thermal_cooling_device_update); |
| 1259 | |
| 1260 | static void thermal_zone_cdev_unbind(struct thermal_zone_device *tz, |
| 1261 | struct thermal_cooling_device *cdev) |
| 1262 | { |
| 1263 | struct thermal_trip_desc *td; |
| 1264 | |
| 1265 | mutex_lock(&tz->lock); |
| 1266 | |
| 1267 | for_each_trip_desc(tz, td) |
| 1268 | thermal_unbind_cdev_from_trip(tz, &td->trip, cdev); |
| 1269 | |
| 1270 | mutex_unlock(&tz->lock); |
| 1271 | } |
| 1272 | |
| 1273 | /** |
| 1274 | * thermal_cooling_device_unregister - removes a thermal cooling device |
| 1275 | * @cdev: the thermal cooling device to remove. |
| 1276 | * |
| 1277 | * thermal_cooling_device_unregister() must be called when a registered |
| 1278 | * thermal cooling device is no longer needed. |
| 1279 | */ |
| 1280 | void thermal_cooling_device_unregister(struct thermal_cooling_device *cdev) |
| 1281 | { |
| 1282 | struct thermal_zone_device *tz; |
| 1283 | |
| 1284 | if (!cdev) |
| 1285 | return; |
| 1286 | |
| 1287 | thermal_debug_cdev_remove(cdev); |
| 1288 | |
| 1289 | mutex_lock(&thermal_list_lock); |
| 1290 | |
| 1291 | if (!thermal_cooling_device_present(cdev)) { |
| 1292 | mutex_unlock(&thermal_list_lock); |
| 1293 | return; |
| 1294 | } |
| 1295 | |
| 1296 | list_del(&cdev->node); |
| 1297 | |
| 1298 | /* Unbind all thermal zones associated with 'this' cdev */ |
| 1299 | list_for_each_entry(tz, &thermal_tz_list, node) |
| 1300 | thermal_zone_cdev_unbind(tz, cdev); |
| 1301 | |
| 1302 | mutex_unlock(&thermal_list_lock); |
| 1303 | |
| 1304 | device_unregister(&cdev->device); |
| 1305 | } |
| 1306 | EXPORT_SYMBOL_GPL(thermal_cooling_device_unregister); |
| 1307 | |
| 1308 | int thermal_zone_get_crit_temp(struct thermal_zone_device *tz, int *temp) |
| 1309 | { |
| 1310 | const struct thermal_trip_desc *td; |
| 1311 | int ret = -EINVAL; |
| 1312 | |
| 1313 | if (tz->ops.get_crit_temp) |
| 1314 | return tz->ops.get_crit_temp(tz, temp); |
| 1315 | |
| 1316 | mutex_lock(&tz->lock); |
| 1317 | |
| 1318 | for_each_trip_desc(tz, td) { |
| 1319 | const struct thermal_trip *trip = &td->trip; |
| 1320 | |
| 1321 | if (trip->type == THERMAL_TRIP_CRITICAL) { |
| 1322 | *temp = trip->temperature; |
| 1323 | ret = 0; |
| 1324 | break; |
| 1325 | } |
| 1326 | } |
| 1327 | |
| 1328 | mutex_unlock(&tz->lock); |
| 1329 | |
| 1330 | return ret; |
| 1331 | } |
| 1332 | EXPORT_SYMBOL_GPL(thermal_zone_get_crit_temp); |
| 1333 | |
| 1334 | /** |
| 1335 | * thermal_zone_device_register_with_trips() - register a new thermal zone device |
| 1336 | * @type: the thermal zone device type |
| 1337 | * @trips: a pointer to an array of thermal trips |
| 1338 | * @num_trips: the number of trip points the thermal zone support |
| 1339 | * @devdata: private device data |
| 1340 | * @ops: standard thermal zone device callbacks |
| 1341 | * @tzp: thermal zone platform parameters |
| 1342 | * @passive_delay: number of milliseconds to wait between polls when |
| 1343 | * performing passive cooling |
| 1344 | * @polling_delay: number of milliseconds to wait between polls when checking |
| 1345 | * whether trip points have been crossed (0 for interrupt |
| 1346 | * driven systems) |
| 1347 | * |
| 1348 | * This interface function adds a new thermal zone device (sensor) to |
| 1349 | * /sys/class/thermal folder as thermal_zone[0-*]. It tries to bind all the |
| 1350 | * thermal cooling devices registered at the same time. |
| 1351 | * thermal_zone_device_unregister() must be called when the device is no |
| 1352 | * longer needed. The passive cooling depends on the .get_trend() return value. |
| 1353 | * |
| 1354 | * Return: a pointer to the created struct thermal_zone_device or an |
| 1355 | * in case of error, an ERR_PTR. Caller must check return value with |
| 1356 | * IS_ERR*() helpers. |
| 1357 | */ |
| 1358 | struct thermal_zone_device * |
| 1359 | thermal_zone_device_register_with_trips(const char *type, |
| 1360 | const struct thermal_trip *trips, |
| 1361 | int num_trips, void *devdata, |
| 1362 | const struct thermal_zone_device_ops *ops, |
| 1363 | const struct thermal_zone_params *tzp, |
| 1364 | unsigned int passive_delay, |
| 1365 | unsigned int polling_delay) |
| 1366 | { |
| 1367 | const struct thermal_trip *trip = trips; |
| 1368 | struct thermal_cooling_device *cdev; |
| 1369 | struct thermal_zone_device *tz; |
| 1370 | struct thermal_trip_desc *td; |
| 1371 | int id; |
| 1372 | int result; |
| 1373 | struct thermal_governor *governor; |
| 1374 | |
| 1375 | if (!type || strlen(type) == 0) { |
| 1376 | pr_err("No thermal zone type defined\n"); |
| 1377 | return ERR_PTR(-EINVAL); |
| 1378 | } |
| 1379 | |
| 1380 | if (strlen(type) >= THERMAL_NAME_LENGTH) { |
| 1381 | pr_err("Thermal zone name (%s) too long, should be under %d chars\n", |
| 1382 | type, THERMAL_NAME_LENGTH); |
| 1383 | return ERR_PTR(-EINVAL); |
| 1384 | } |
| 1385 | |
| 1386 | if (num_trips < 0) { |
| 1387 | pr_err("Incorrect number of thermal trips\n"); |
| 1388 | return ERR_PTR(-EINVAL); |
| 1389 | } |
| 1390 | |
| 1391 | if (!ops || !ops->get_temp) { |
| 1392 | pr_err("Thermal zone device ops not defined or invalid\n"); |
| 1393 | return ERR_PTR(-EINVAL); |
| 1394 | } |
| 1395 | |
| 1396 | if (num_trips > 0 && !trips) |
| 1397 | return ERR_PTR(-EINVAL); |
| 1398 | |
| 1399 | if (polling_delay && passive_delay > polling_delay) |
| 1400 | return ERR_PTR(-EINVAL); |
| 1401 | |
| 1402 | if (!thermal_class) |
| 1403 | return ERR_PTR(-ENODEV); |
| 1404 | |
| 1405 | tz = kzalloc(struct_size(tz, trips, num_trips), GFP_KERNEL); |
| 1406 | if (!tz) |
| 1407 | return ERR_PTR(-ENOMEM); |
| 1408 | |
| 1409 | if (tzp) { |
| 1410 | tz->tzp = kmemdup(tzp, sizeof(*tzp), GFP_KERNEL); |
| 1411 | if (!tz->tzp) { |
| 1412 | result = -ENOMEM; |
| 1413 | goto free_tz; |
| 1414 | } |
| 1415 | } |
| 1416 | |
| 1417 | INIT_LIST_HEAD(&tz->thermal_instances); |
| 1418 | INIT_LIST_HEAD(&tz->node); |
| 1419 | ida_init(&tz->ida); |
| 1420 | mutex_init(&tz->lock); |
| 1421 | init_completion(&tz->removal); |
| 1422 | init_completion(&tz->resume); |
| 1423 | id = ida_alloc(&thermal_tz_ida, GFP_KERNEL); |
| 1424 | if (id < 0) { |
| 1425 | result = id; |
| 1426 | goto free_tzp; |
| 1427 | } |
| 1428 | |
| 1429 | tz->id = id; |
| 1430 | strscpy(tz->type, type, sizeof(tz->type)); |
| 1431 | |
| 1432 | tz->ops = *ops; |
| 1433 | if (!tz->ops.critical) |
| 1434 | tz->ops.critical = thermal_zone_device_critical; |
| 1435 | |
| 1436 | tz->device.class = thermal_class; |
| 1437 | tz->devdata = devdata; |
| 1438 | tz->num_trips = num_trips; |
| 1439 | for_each_trip_desc(tz, td) { |
| 1440 | td->trip = *trip++; |
| 1441 | /* |
| 1442 | * Mark all thresholds as invalid to start with even though |
| 1443 | * this only matters for the trips that start as invalid and |
| 1444 | * become valid later. |
| 1445 | */ |
| 1446 | td->threshold = INT_MAX; |
| 1447 | } |
| 1448 | |
| 1449 | tz->polling_delay_jiffies = msecs_to_jiffies(polling_delay); |
| 1450 | tz->passive_delay_jiffies = msecs_to_jiffies(passive_delay); |
| 1451 | tz->recheck_delay_jiffies = THERMAL_RECHECK_DELAY; |
| 1452 | |
| 1453 | /* sys I/F */ |
| 1454 | /* Add nodes that are always present via .groups */ |
| 1455 | result = thermal_zone_create_device_groups(tz); |
| 1456 | if (result) |
| 1457 | goto remove_id; |
| 1458 | |
| 1459 | /* A new thermal zone needs to be updated anyway. */ |
| 1460 | atomic_set(&tz->need_update, 1); |
| 1461 | |
| 1462 | result = dev_set_name(&tz->device, "thermal_zone%d", tz->id); |
| 1463 | if (result) { |
| 1464 | thermal_zone_destroy_device_groups(tz); |
| 1465 | goto remove_id; |
| 1466 | } |
| 1467 | result = device_register(&tz->device); |
| 1468 | if (result) |
| 1469 | goto release_device; |
| 1470 | |
| 1471 | /* Update 'this' zone's governor information */ |
| 1472 | mutex_lock(&thermal_governor_lock); |
| 1473 | |
| 1474 | if (tz->tzp) |
| 1475 | governor = __find_governor(tz->tzp->governor_name); |
| 1476 | else |
| 1477 | governor = def_governor; |
| 1478 | |
| 1479 | result = thermal_set_governor(tz, governor); |
| 1480 | if (result) { |
| 1481 | mutex_unlock(&thermal_governor_lock); |
| 1482 | goto unregister; |
| 1483 | } |
| 1484 | |
| 1485 | mutex_unlock(&thermal_governor_lock); |
| 1486 | |
| 1487 | if (!tz->tzp || !tz->tzp->no_hwmon) { |
| 1488 | result = thermal_add_hwmon_sysfs(tz); |
| 1489 | if (result) |
| 1490 | goto unregister; |
| 1491 | } |
| 1492 | |
| 1493 | mutex_lock(&thermal_list_lock); |
| 1494 | |
| 1495 | mutex_lock(&tz->lock); |
| 1496 | list_add_tail(&tz->node, &thermal_tz_list); |
| 1497 | mutex_unlock(&tz->lock); |
| 1498 | |
| 1499 | /* Bind cooling devices for this zone */ |
| 1500 | list_for_each_entry(cdev, &thermal_cdev_list, node) |
| 1501 | thermal_zone_cdev_bind(tz, cdev); |
| 1502 | |
| 1503 | mutex_unlock(&thermal_list_lock); |
| 1504 | |
| 1505 | thermal_zone_device_init(tz); |
| 1506 | /* Update the new thermal zone and mark it as already updated. */ |
| 1507 | if (atomic_cmpxchg(&tz->need_update, 1, 0)) |
| 1508 | thermal_zone_device_update(tz, THERMAL_EVENT_UNSPECIFIED); |
| 1509 | |
| 1510 | thermal_notify_tz_create(tz); |
| 1511 | |
| 1512 | thermal_debug_tz_add(tz); |
| 1513 | |
| 1514 | return tz; |
| 1515 | |
| 1516 | unregister: |
| 1517 | device_del(&tz->device); |
| 1518 | release_device: |
| 1519 | put_device(&tz->device); |
| 1520 | remove_id: |
| 1521 | ida_free(&thermal_tz_ida, id); |
| 1522 | free_tzp: |
| 1523 | kfree(tz->tzp); |
| 1524 | free_tz: |
| 1525 | kfree(tz); |
| 1526 | return ERR_PTR(result); |
| 1527 | } |
| 1528 | EXPORT_SYMBOL_GPL(thermal_zone_device_register_with_trips); |
| 1529 | |
| 1530 | struct thermal_zone_device *thermal_tripless_zone_device_register( |
| 1531 | const char *type, |
| 1532 | void *devdata, |
| 1533 | const struct thermal_zone_device_ops *ops, |
| 1534 | const struct thermal_zone_params *tzp) |
| 1535 | { |
| 1536 | return thermal_zone_device_register_with_trips(type, NULL, 0, devdata, |
| 1537 | ops, tzp, 0, 0); |
| 1538 | } |
| 1539 | EXPORT_SYMBOL_GPL(thermal_tripless_zone_device_register); |
| 1540 | |
| 1541 | void *thermal_zone_device_priv(struct thermal_zone_device *tzd) |
| 1542 | { |
| 1543 | return tzd->devdata; |
| 1544 | } |
| 1545 | EXPORT_SYMBOL_GPL(thermal_zone_device_priv); |
| 1546 | |
| 1547 | const char *thermal_zone_device_type(struct thermal_zone_device *tzd) |
| 1548 | { |
| 1549 | return tzd->type; |
| 1550 | } |
| 1551 | EXPORT_SYMBOL_GPL(thermal_zone_device_type); |
| 1552 | |
| 1553 | int thermal_zone_device_id(struct thermal_zone_device *tzd) |
| 1554 | { |
| 1555 | return tzd->id; |
| 1556 | } |
| 1557 | EXPORT_SYMBOL_GPL(thermal_zone_device_id); |
| 1558 | |
| 1559 | struct device *thermal_zone_device(struct thermal_zone_device *tzd) |
| 1560 | { |
| 1561 | return &tzd->device; |
| 1562 | } |
| 1563 | EXPORT_SYMBOL_GPL(thermal_zone_device); |
| 1564 | |
| 1565 | /** |
| 1566 | * thermal_zone_device_unregister - removes the registered thermal zone device |
| 1567 | * @tz: the thermal zone device to remove |
| 1568 | */ |
| 1569 | void thermal_zone_device_unregister(struct thermal_zone_device *tz) |
| 1570 | { |
| 1571 | struct thermal_cooling_device *cdev; |
| 1572 | struct thermal_zone_device *pos = NULL; |
| 1573 | |
| 1574 | if (!tz) |
| 1575 | return; |
| 1576 | |
| 1577 | thermal_debug_tz_remove(tz); |
| 1578 | |
| 1579 | mutex_lock(&thermal_list_lock); |
| 1580 | list_for_each_entry(pos, &thermal_tz_list, node) |
| 1581 | if (pos == tz) |
| 1582 | break; |
| 1583 | if (pos != tz) { |
| 1584 | /* thermal zone device not found */ |
| 1585 | mutex_unlock(&thermal_list_lock); |
| 1586 | return; |
| 1587 | } |
| 1588 | |
| 1589 | mutex_lock(&tz->lock); |
| 1590 | list_del(&tz->node); |
| 1591 | mutex_unlock(&tz->lock); |
| 1592 | |
| 1593 | /* Unbind all cdevs associated with 'this' thermal zone */ |
| 1594 | list_for_each_entry(cdev, &thermal_cdev_list, node) |
| 1595 | thermal_zone_cdev_unbind(tz, cdev); |
| 1596 | |
| 1597 | mutex_unlock(&thermal_list_lock); |
| 1598 | |
| 1599 | cancel_delayed_work_sync(&tz->poll_queue); |
| 1600 | |
| 1601 | thermal_set_governor(tz, NULL); |
| 1602 | |
| 1603 | thermal_remove_hwmon_sysfs(tz); |
| 1604 | ida_free(&thermal_tz_ida, tz->id); |
| 1605 | ida_destroy(&tz->ida); |
| 1606 | |
| 1607 | device_del(&tz->device); |
| 1608 | |
| 1609 | kfree(tz->tzp); |
| 1610 | |
| 1611 | put_device(&tz->device); |
| 1612 | |
| 1613 | thermal_notify_tz_delete(tz); |
| 1614 | |
| 1615 | wait_for_completion(&tz->removal); |
| 1616 | kfree(tz); |
| 1617 | } |
| 1618 | EXPORT_SYMBOL_GPL(thermal_zone_device_unregister); |
| 1619 | |
| 1620 | /** |
| 1621 | * thermal_zone_get_zone_by_name() - search for a zone and returns its ref |
| 1622 | * @name: thermal zone name to fetch the temperature |
| 1623 | * |
| 1624 | * When only one zone is found with the passed name, returns a reference to it. |
| 1625 | * |
| 1626 | * Return: On success returns a reference to an unique thermal zone with |
| 1627 | * matching name equals to @name, an ERR_PTR otherwise (-EINVAL for invalid |
| 1628 | * paramenters, -ENODEV for not found and -EEXIST for multiple matches). |
| 1629 | */ |
| 1630 | struct thermal_zone_device *thermal_zone_get_zone_by_name(const char *name) |
| 1631 | { |
| 1632 | struct thermal_zone_device *pos = NULL, *ref = ERR_PTR(-EINVAL); |
| 1633 | unsigned int found = 0; |
| 1634 | |
| 1635 | if (!name) |
| 1636 | goto exit; |
| 1637 | |
| 1638 | mutex_lock(&thermal_list_lock); |
| 1639 | list_for_each_entry(pos, &thermal_tz_list, node) |
| 1640 | if (!strncasecmp(name, pos->type, THERMAL_NAME_LENGTH)) { |
| 1641 | found++; |
| 1642 | ref = pos; |
| 1643 | } |
| 1644 | mutex_unlock(&thermal_list_lock); |
| 1645 | |
| 1646 | /* nothing has been found, thus an error code for it */ |
| 1647 | if (found == 0) |
| 1648 | ref = ERR_PTR(-ENODEV); |
| 1649 | else if (found > 1) |
| 1650 | /* Success only when an unique zone is found */ |
| 1651 | ref = ERR_PTR(-EEXIST); |
| 1652 | |
| 1653 | exit: |
| 1654 | return ref; |
| 1655 | } |
| 1656 | EXPORT_SYMBOL_GPL(thermal_zone_get_zone_by_name); |
| 1657 | |
| 1658 | static void thermal_zone_device_resume(struct work_struct *work) |
| 1659 | { |
| 1660 | struct thermal_zone_device *tz; |
| 1661 | |
| 1662 | tz = container_of(work, struct thermal_zone_device, poll_queue.work); |
| 1663 | |
| 1664 | mutex_lock(&tz->lock); |
| 1665 | |
| 1666 | tz->suspended = false; |
| 1667 | |
| 1668 | thermal_debug_tz_resume(tz); |
| 1669 | thermal_zone_device_init(tz); |
| 1670 | thermal_governor_update_tz(tz, THERMAL_TZ_RESUME); |
| 1671 | __thermal_zone_device_update(tz, THERMAL_TZ_RESUME); |
| 1672 | |
| 1673 | complete(&tz->resume); |
| 1674 | tz->resuming = false; |
| 1675 | |
| 1676 | mutex_unlock(&tz->lock); |
| 1677 | } |
| 1678 | |
| 1679 | static int thermal_pm_notify(struct notifier_block *nb, |
| 1680 | unsigned long mode, void *_unused) |
| 1681 | { |
| 1682 | struct thermal_zone_device *tz; |
| 1683 | |
| 1684 | switch (mode) { |
| 1685 | case PM_HIBERNATION_PREPARE: |
| 1686 | case PM_RESTORE_PREPARE: |
| 1687 | case PM_SUSPEND_PREPARE: |
| 1688 | mutex_lock(&thermal_list_lock); |
| 1689 | |
| 1690 | list_for_each_entry(tz, &thermal_tz_list, node) { |
| 1691 | mutex_lock(&tz->lock); |
| 1692 | |
| 1693 | if (tz->resuming) { |
| 1694 | /* |
| 1695 | * thermal_zone_device_resume() queued up for |
| 1696 | * this zone has not acquired the lock yet, so |
| 1697 | * release it to let the function run and wait |
| 1698 | * util it has done the work. |
| 1699 | */ |
| 1700 | mutex_unlock(&tz->lock); |
| 1701 | |
| 1702 | wait_for_completion(&tz->resume); |
| 1703 | |
| 1704 | mutex_lock(&tz->lock); |
| 1705 | } |
| 1706 | |
| 1707 | tz->suspended = true; |
| 1708 | |
| 1709 | mutex_unlock(&tz->lock); |
| 1710 | } |
| 1711 | |
| 1712 | mutex_unlock(&thermal_list_lock); |
| 1713 | break; |
| 1714 | case PM_POST_HIBERNATION: |
| 1715 | case PM_POST_RESTORE: |
| 1716 | case PM_POST_SUSPEND: |
| 1717 | mutex_lock(&thermal_list_lock); |
| 1718 | |
| 1719 | list_for_each_entry(tz, &thermal_tz_list, node) { |
| 1720 | mutex_lock(&tz->lock); |
| 1721 | |
| 1722 | cancel_delayed_work(&tz->poll_queue); |
| 1723 | |
| 1724 | reinit_completion(&tz->resume); |
| 1725 | tz->resuming = true; |
| 1726 | |
| 1727 | /* |
| 1728 | * Replace the work function with the resume one, which |
| 1729 | * will restore the original work function and schedule |
| 1730 | * the polling work if needed. |
| 1731 | */ |
| 1732 | INIT_DELAYED_WORK(&tz->poll_queue, |
| 1733 | thermal_zone_device_resume); |
| 1734 | /* Queue up the work without a delay. */ |
| 1735 | mod_delayed_work(system_freezable_power_efficient_wq, |
| 1736 | &tz->poll_queue, 0); |
| 1737 | |
| 1738 | mutex_unlock(&tz->lock); |
| 1739 | } |
| 1740 | |
| 1741 | mutex_unlock(&thermal_list_lock); |
| 1742 | break; |
| 1743 | default: |
| 1744 | break; |
| 1745 | } |
| 1746 | return 0; |
| 1747 | } |
| 1748 | |
| 1749 | static struct notifier_block thermal_pm_nb = { |
| 1750 | .notifier_call = thermal_pm_notify, |
| 1751 | /* |
| 1752 | * Run at the lowest priority to avoid interference between the thermal |
| 1753 | * zone resume work items spawned by thermal_pm_notify() and the other |
| 1754 | * PM notifiers. |
| 1755 | */ |
| 1756 | .priority = INT_MIN, |
| 1757 | }; |
| 1758 | |
| 1759 | static int __init thermal_init(void) |
| 1760 | { |
| 1761 | int result; |
| 1762 | |
| 1763 | thermal_debug_init(); |
| 1764 | |
| 1765 | result = thermal_netlink_init(); |
| 1766 | if (result) |
| 1767 | goto error; |
| 1768 | |
| 1769 | result = thermal_register_governors(); |
| 1770 | if (result) |
| 1771 | goto unregister_netlink; |
| 1772 | |
| 1773 | thermal_class = kzalloc(sizeof(*thermal_class), GFP_KERNEL); |
| 1774 | if (!thermal_class) { |
| 1775 | result = -ENOMEM; |
| 1776 | goto unregister_governors; |
| 1777 | } |
| 1778 | |
| 1779 | thermal_class->name = "thermal"; |
| 1780 | thermal_class->dev_release = thermal_release; |
| 1781 | |
| 1782 | result = class_register(thermal_class); |
| 1783 | if (result) { |
| 1784 | kfree(thermal_class); |
| 1785 | thermal_class = NULL; |
| 1786 | goto unregister_governors; |
| 1787 | } |
| 1788 | |
| 1789 | result = register_pm_notifier(&thermal_pm_nb); |
| 1790 | if (result) |
| 1791 | pr_warn("Thermal: Can not register suspend notifier, return %d\n", |
| 1792 | result); |
| 1793 | |
| 1794 | return 0; |
| 1795 | |
| 1796 | unregister_governors: |
| 1797 | thermal_unregister_governors(); |
| 1798 | unregister_netlink: |
| 1799 | thermal_netlink_exit(); |
| 1800 | error: |
| 1801 | mutex_destroy(&thermal_list_lock); |
| 1802 | mutex_destroy(&thermal_governor_lock); |
| 1803 | return result; |
| 1804 | } |
| 1805 | postcore_initcall(thermal_init); |