1 // SPDX-License-Identifier: GPL-2.0 2 /* 3 * thermal.c - sysfs interface of thermal devices 4 * 5 * Copyright (C) 2016 Eduardo Valentin <edubezval@gmail.com> 6 * 7 * Highly based on original thermal_core.c 8 * Copyright (C) 2008 Intel Corp 9 * Copyright (C) 2008 Zhang Rui <rui.zhang@intel.com> 10 * Copyright (C) 2008 Sujith Thomas <sujith.thomas@intel.com> 11 */ 12 13 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt 14 15 #include <linux/sysfs.h> 16 #include <linux/device.h> 17 #include <linux/err.h> 18 #include <linux/slab.h> 19 #include <linux/string.h> 20 #include <linux/jiffies.h> 21 22 #include "thermal_core.h" 23 24 /* sys I/F for thermal zone */ 25 26 static ssize_t 27 type_show(struct device *dev, struct device_attribute *attr, char *buf) 28 { 29 struct thermal_zone_device *tz = to_thermal_zone(dev); 30 31 return sprintf(buf, "%s\n", tz->type); 32 } 33 34 static ssize_t 35 temp_show(struct device *dev, struct device_attribute *attr, char *buf) 36 { 37 struct thermal_zone_device *tz = to_thermal_zone(dev); 38 int temperature, ret; 39 40 ret = thermal_zone_get_temp(tz, &temperature); 41 42 if (ret) 43 return ret; 44 45 return sprintf(buf, "%d\n", temperature); 46 } 47 48 static ssize_t 49 mode_show(struct device *dev, struct device_attribute *attr, char *buf) 50 { 51 struct thermal_zone_device *tz = to_thermal_zone(dev); 52 int enabled; 53 54 mutex_lock(&tz->lock); 55 enabled = thermal_zone_device_is_enabled(tz); 56 mutex_unlock(&tz->lock); 57 58 return sprintf(buf, "%s\n", enabled ? "enabled" : "disabled"); 59 } 60 61 static ssize_t 62 mode_store(struct device *dev, struct device_attribute *attr, 63 const char *buf, size_t count) 64 { 65 struct thermal_zone_device *tz = to_thermal_zone(dev); 66 int result; 67 68 if (!strncmp(buf, "enabled", sizeof("enabled") - 1)) 69 result = thermal_zone_device_enable(tz); 70 else if (!strncmp(buf, "disabled", sizeof("disabled") - 1)) 71 result = thermal_zone_device_disable(tz); 72 else 73 result = -EINVAL; 74 75 if (result) 76 return result; 77 78 return count; 79 } 80 81 static ssize_t 82 trip_point_type_show(struct device *dev, struct device_attribute *attr, 83 char *buf) 84 { 85 struct thermal_zone_device *tz = to_thermal_zone(dev); 86 struct thermal_trip trip; 87 int trip_id, result; 88 89 if (sscanf(attr->attr.name, "trip_point_%d_type", &trip_id) != 1) 90 return -EINVAL; 91 92 mutex_lock(&tz->lock); 93 94 if (device_is_registered(dev)) 95 result = __thermal_zone_get_trip(tz, trip_id, &trip); 96 else 97 result = -ENODEV; 98 99 mutex_unlock(&tz->lock); 100 101 if (result) 102 return result; 103 104 switch (trip.type) { 105 case THERMAL_TRIP_CRITICAL: 106 return sprintf(buf, "critical\n"); 107 case THERMAL_TRIP_HOT: 108 return sprintf(buf, "hot\n"); 109 case THERMAL_TRIP_PASSIVE: 110 return sprintf(buf, "passive\n"); 111 case THERMAL_TRIP_ACTIVE: 112 return sprintf(buf, "active\n"); 113 default: 114 return sprintf(buf, "unknown\n"); 115 } 116 } 117 118 static ssize_t 119 trip_point_temp_store(struct device *dev, struct device_attribute *attr, 120 const char *buf, size_t count) 121 { 122 struct thermal_zone_device *tz = to_thermal_zone(dev); 123 struct thermal_trip trip; 124 int trip_id, ret; 125 126 if (sscanf(attr->attr.name, "trip_point_%d_temp", &trip_id) != 1) 127 return -EINVAL; 128 129 mutex_lock(&tz->lock); 130 131 if (!device_is_registered(dev)) { 132 ret = -ENODEV; 133 goto unlock; 134 } 135 136 ret = __thermal_zone_get_trip(tz, trip_id, &trip); 137 if (ret) 138 goto unlock; 139 140 ret = kstrtoint(buf, 10, &trip.temperature); 141 if (ret) 142 goto unlock; 143 144 ret = thermal_zone_set_trip(tz, trip_id, &trip); 145 unlock: 146 mutex_unlock(&tz->lock); 147 148 return ret ? ret : count; 149 } 150 151 static ssize_t 152 trip_point_temp_show(struct device *dev, struct device_attribute *attr, 153 char *buf) 154 { 155 struct thermal_zone_device *tz = to_thermal_zone(dev); 156 struct thermal_trip trip; 157 int trip_id, ret; 158 159 if (sscanf(attr->attr.name, "trip_point_%d_temp", &trip_id) != 1) 160 return -EINVAL; 161 162 mutex_lock(&tz->lock); 163 164 if (device_is_registered(dev)) 165 ret = __thermal_zone_get_trip(tz, trip_id, &trip); 166 else 167 ret = -ENODEV; 168 169 mutex_unlock(&tz->lock); 170 171 if (ret) 172 return ret; 173 174 return sprintf(buf, "%d\n", trip.temperature); 175 } 176 177 static ssize_t 178 trip_point_hyst_store(struct device *dev, struct device_attribute *attr, 179 const char *buf, size_t count) 180 { 181 struct thermal_zone_device *tz = to_thermal_zone(dev); 182 struct thermal_trip trip; 183 int trip_id, ret; 184 185 if (sscanf(attr->attr.name, "trip_point_%d_hyst", &trip_id) != 1) 186 return -EINVAL; 187 188 mutex_lock(&tz->lock); 189 190 if (!device_is_registered(dev)) { 191 ret = -ENODEV; 192 goto unlock; 193 } 194 195 ret = __thermal_zone_get_trip(tz, trip_id, &trip); 196 if (ret) 197 goto unlock; 198 199 ret = kstrtoint(buf, 10, &trip.hysteresis); 200 if (ret) 201 goto unlock; 202 203 ret = thermal_zone_set_trip(tz, trip_id, &trip); 204 unlock: 205 mutex_unlock(&tz->lock); 206 207 return ret ? ret : count; 208 } 209 210 static ssize_t 211 trip_point_hyst_show(struct device *dev, struct device_attribute *attr, 212 char *buf) 213 { 214 struct thermal_zone_device *tz = to_thermal_zone(dev); 215 struct thermal_trip trip; 216 int trip_id, ret; 217 218 if (sscanf(attr->attr.name, "trip_point_%d_hyst", &trip_id) != 1) 219 return -EINVAL; 220 221 mutex_lock(&tz->lock); 222 223 if (device_is_registered(dev)) 224 ret = __thermal_zone_get_trip(tz, trip_id, &trip); 225 else 226 ret = -ENODEV; 227 228 mutex_unlock(&tz->lock); 229 230 return ret ? ret : sprintf(buf, "%d\n", trip.hysteresis); 231 } 232 233 static ssize_t 234 policy_store(struct device *dev, struct device_attribute *attr, 235 const char *buf, size_t count) 236 { 237 struct thermal_zone_device *tz = to_thermal_zone(dev); 238 char name[THERMAL_NAME_LENGTH]; 239 int ret; 240 241 snprintf(name, sizeof(name), "%s", buf); 242 243 ret = thermal_zone_device_set_policy(tz, name); 244 if (!ret) 245 ret = count; 246 247 return ret; 248 } 249 250 static ssize_t 251 policy_show(struct device *dev, struct device_attribute *devattr, char *buf) 252 { 253 struct thermal_zone_device *tz = to_thermal_zone(dev); 254 255 return sprintf(buf, "%s\n", tz->governor->name); 256 } 257 258 static ssize_t 259 available_policies_show(struct device *dev, struct device_attribute *devattr, 260 char *buf) 261 { 262 return thermal_build_list_of_policies(buf); 263 } 264 265 #if (IS_ENABLED(CONFIG_THERMAL_EMULATION)) 266 static ssize_t 267 emul_temp_store(struct device *dev, struct device_attribute *attr, 268 const char *buf, size_t count) 269 { 270 struct thermal_zone_device *tz = to_thermal_zone(dev); 271 int ret = 0; 272 int temperature; 273 274 if (kstrtoint(buf, 10, &temperature)) 275 return -EINVAL; 276 277 mutex_lock(&tz->lock); 278 279 if (!device_is_registered(dev)) { 280 ret = -ENODEV; 281 goto unlock; 282 } 283 284 if (!tz->ops->set_emul_temp) 285 tz->emul_temperature = temperature; 286 else 287 ret = tz->ops->set_emul_temp(tz, temperature); 288 289 if (!ret) 290 __thermal_zone_device_update(tz, THERMAL_EVENT_UNSPECIFIED); 291 292 unlock: 293 mutex_unlock(&tz->lock); 294 295 return ret ? ret : count; 296 } 297 static DEVICE_ATTR_WO(emul_temp); 298 #endif 299 300 static ssize_t 301 sustainable_power_show(struct device *dev, struct device_attribute *devattr, 302 char *buf) 303 { 304 struct thermal_zone_device *tz = to_thermal_zone(dev); 305 306 if (tz->tzp) 307 return sprintf(buf, "%u\n", tz->tzp->sustainable_power); 308 else 309 return -EIO; 310 } 311 312 static ssize_t 313 sustainable_power_store(struct device *dev, struct device_attribute *devattr, 314 const char *buf, size_t count) 315 { 316 struct thermal_zone_device *tz = to_thermal_zone(dev); 317 u32 sustainable_power; 318 319 if (!tz->tzp) 320 return -EIO; 321 322 if (kstrtou32(buf, 10, &sustainable_power)) 323 return -EINVAL; 324 325 tz->tzp->sustainable_power = sustainable_power; 326 327 return count; 328 } 329 330 #define create_s32_tzp_attr(name) \ 331 static ssize_t \ 332 name##_show(struct device *dev, struct device_attribute *devattr, \ 333 char *buf) \ 334 { \ 335 struct thermal_zone_device *tz = to_thermal_zone(dev); \ 336 \ 337 if (tz->tzp) \ 338 return sprintf(buf, "%d\n", tz->tzp->name); \ 339 else \ 340 return -EIO; \ 341 } \ 342 \ 343 static ssize_t \ 344 name##_store(struct device *dev, struct device_attribute *devattr, \ 345 const char *buf, size_t count) \ 346 { \ 347 struct thermal_zone_device *tz = to_thermal_zone(dev); \ 348 s32 value; \ 349 \ 350 if (!tz->tzp) \ 351 return -EIO; \ 352 \ 353 if (kstrtos32(buf, 10, &value)) \ 354 return -EINVAL; \ 355 \ 356 tz->tzp->name = value; \ 357 \ 358 return count; \ 359 } \ 360 static DEVICE_ATTR_RW(name) 361 362 create_s32_tzp_attr(k_po); 363 create_s32_tzp_attr(k_pu); 364 create_s32_tzp_attr(k_i); 365 create_s32_tzp_attr(k_d); 366 create_s32_tzp_attr(integral_cutoff); 367 create_s32_tzp_attr(slope); 368 create_s32_tzp_attr(offset); 369 #undef create_s32_tzp_attr 370 371 /* 372 * These are thermal zone device attributes that will always be present. 373 * All the attributes created for tzp (create_s32_tzp_attr) also are always 374 * present on the sysfs interface. 375 */ 376 static DEVICE_ATTR_RO(type); 377 static DEVICE_ATTR_RO(temp); 378 static DEVICE_ATTR_RW(policy); 379 static DEVICE_ATTR_RO(available_policies); 380 static DEVICE_ATTR_RW(sustainable_power); 381 382 /* These thermal zone device attributes are created based on conditions */ 383 static DEVICE_ATTR_RW(mode); 384 385 /* These attributes are unconditionally added to a thermal zone */ 386 static struct attribute *thermal_zone_dev_attrs[] = { 387 &dev_attr_type.attr, 388 &dev_attr_temp.attr, 389 #if (IS_ENABLED(CONFIG_THERMAL_EMULATION)) 390 &dev_attr_emul_temp.attr, 391 #endif 392 &dev_attr_policy.attr, 393 &dev_attr_available_policies.attr, 394 &dev_attr_sustainable_power.attr, 395 &dev_attr_k_po.attr, 396 &dev_attr_k_pu.attr, 397 &dev_attr_k_i.attr, 398 &dev_attr_k_d.attr, 399 &dev_attr_integral_cutoff.attr, 400 &dev_attr_slope.attr, 401 &dev_attr_offset.attr, 402 NULL, 403 }; 404 405 static const struct attribute_group thermal_zone_attribute_group = { 406 .attrs = thermal_zone_dev_attrs, 407 }; 408 409 static struct attribute *thermal_zone_mode_attrs[] = { 410 &dev_attr_mode.attr, 411 NULL, 412 }; 413 414 static const struct attribute_group thermal_zone_mode_attribute_group = { 415 .attrs = thermal_zone_mode_attrs, 416 }; 417 418 static const struct attribute_group *thermal_zone_attribute_groups[] = { 419 &thermal_zone_attribute_group, 420 &thermal_zone_mode_attribute_group, 421 /* This is not NULL terminated as we create the group dynamically */ 422 }; 423 424 /** 425 * create_trip_attrs() - create attributes for trip points 426 * @tz: the thermal zone device 427 * @mask: Writeable trip point bitmap. 428 * 429 * helper function to instantiate sysfs entries for every trip 430 * point and its properties of a struct thermal_zone_device. 431 * 432 * Return: 0 on success, the proper error value otherwise. 433 */ 434 static int create_trip_attrs(struct thermal_zone_device *tz, int mask) 435 { 436 struct attribute **attrs; 437 int indx; 438 439 /* This function works only for zones with at least one trip */ 440 if (tz->num_trips <= 0) 441 return -EINVAL; 442 443 tz->trip_type_attrs = kcalloc(tz->num_trips, sizeof(*tz->trip_type_attrs), 444 GFP_KERNEL); 445 if (!tz->trip_type_attrs) 446 return -ENOMEM; 447 448 tz->trip_temp_attrs = kcalloc(tz->num_trips, sizeof(*tz->trip_temp_attrs), 449 GFP_KERNEL); 450 if (!tz->trip_temp_attrs) { 451 kfree(tz->trip_type_attrs); 452 return -ENOMEM; 453 } 454 455 tz->trip_hyst_attrs = kcalloc(tz->num_trips, 456 sizeof(*tz->trip_hyst_attrs), 457 GFP_KERNEL); 458 if (!tz->trip_hyst_attrs) { 459 kfree(tz->trip_type_attrs); 460 kfree(tz->trip_temp_attrs); 461 return -ENOMEM; 462 } 463 464 attrs = kcalloc(tz->num_trips * 3 + 1, sizeof(*attrs), GFP_KERNEL); 465 if (!attrs) { 466 kfree(tz->trip_type_attrs); 467 kfree(tz->trip_temp_attrs); 468 kfree(tz->trip_hyst_attrs); 469 return -ENOMEM; 470 } 471 472 for (indx = 0; indx < tz->num_trips; indx++) { 473 /* create trip type attribute */ 474 snprintf(tz->trip_type_attrs[indx].name, THERMAL_NAME_LENGTH, 475 "trip_point_%d_type", indx); 476 477 sysfs_attr_init(&tz->trip_type_attrs[indx].attr.attr); 478 tz->trip_type_attrs[indx].attr.attr.name = 479 tz->trip_type_attrs[indx].name; 480 tz->trip_type_attrs[indx].attr.attr.mode = S_IRUGO; 481 tz->trip_type_attrs[indx].attr.show = trip_point_type_show; 482 attrs[indx] = &tz->trip_type_attrs[indx].attr.attr; 483 484 /* create trip temp attribute */ 485 snprintf(tz->trip_temp_attrs[indx].name, THERMAL_NAME_LENGTH, 486 "trip_point_%d_temp", indx); 487 488 sysfs_attr_init(&tz->trip_temp_attrs[indx].attr.attr); 489 tz->trip_temp_attrs[indx].attr.attr.name = 490 tz->trip_temp_attrs[indx].name; 491 tz->trip_temp_attrs[indx].attr.attr.mode = S_IRUGO; 492 tz->trip_temp_attrs[indx].attr.show = trip_point_temp_show; 493 if (IS_ENABLED(CONFIG_THERMAL_WRITABLE_TRIPS) && 494 mask & (1 << indx)) { 495 tz->trip_temp_attrs[indx].attr.attr.mode |= S_IWUSR; 496 tz->trip_temp_attrs[indx].attr.store = 497 trip_point_temp_store; 498 } 499 attrs[indx + tz->num_trips] = &tz->trip_temp_attrs[indx].attr.attr; 500 501 snprintf(tz->trip_hyst_attrs[indx].name, THERMAL_NAME_LENGTH, 502 "trip_point_%d_hyst", indx); 503 504 sysfs_attr_init(&tz->trip_hyst_attrs[indx].attr.attr); 505 tz->trip_hyst_attrs[indx].attr.attr.name = 506 tz->trip_hyst_attrs[indx].name; 507 tz->trip_hyst_attrs[indx].attr.attr.mode = S_IRUGO; 508 tz->trip_hyst_attrs[indx].attr.show = trip_point_hyst_show; 509 if (tz->ops->set_trip_hyst) { 510 tz->trip_hyst_attrs[indx].attr.attr.mode |= S_IWUSR; 511 tz->trip_hyst_attrs[indx].attr.store = 512 trip_point_hyst_store; 513 } 514 attrs[indx + tz->num_trips * 2] = 515 &tz->trip_hyst_attrs[indx].attr.attr; 516 } 517 attrs[tz->num_trips * 3] = NULL; 518 519 tz->trips_attribute_group.attrs = attrs; 520 521 return 0; 522 } 523 524 /** 525 * destroy_trip_attrs() - destroy attributes for trip points 526 * @tz: the thermal zone device 527 * 528 * helper function to free resources allocated by create_trip_attrs() 529 */ 530 static void destroy_trip_attrs(struct thermal_zone_device *tz) 531 { 532 if (!tz) 533 return; 534 535 kfree(tz->trip_type_attrs); 536 kfree(tz->trip_temp_attrs); 537 kfree(tz->trip_hyst_attrs); 538 kfree(tz->trips_attribute_group.attrs); 539 } 540 541 int thermal_zone_create_device_groups(struct thermal_zone_device *tz, 542 int mask) 543 { 544 const struct attribute_group **groups; 545 int i, size, result; 546 547 /* we need one extra for trips and the NULL to terminate the array */ 548 size = ARRAY_SIZE(thermal_zone_attribute_groups) + 2; 549 /* This also takes care of API requirement to be NULL terminated */ 550 groups = kcalloc(size, sizeof(*groups), GFP_KERNEL); 551 if (!groups) 552 return -ENOMEM; 553 554 for (i = 0; i < size - 2; i++) 555 groups[i] = thermal_zone_attribute_groups[i]; 556 557 if (tz->num_trips) { 558 result = create_trip_attrs(tz, mask); 559 if (result) { 560 kfree(groups); 561 562 return result; 563 } 564 565 groups[size - 2] = &tz->trips_attribute_group; 566 } 567 568 tz->device.groups = groups; 569 570 return 0; 571 } 572 573 void thermal_zone_destroy_device_groups(struct thermal_zone_device *tz) 574 { 575 if (!tz) 576 return; 577 578 if (tz->num_trips) 579 destroy_trip_attrs(tz); 580 581 kfree(tz->device.groups); 582 } 583 584 /* sys I/F for cooling device */ 585 static ssize_t 586 cdev_type_show(struct device *dev, struct device_attribute *attr, char *buf) 587 { 588 struct thermal_cooling_device *cdev = to_cooling_device(dev); 589 590 return sprintf(buf, "%s\n", cdev->type); 591 } 592 593 static ssize_t max_state_show(struct device *dev, struct device_attribute *attr, 594 char *buf) 595 { 596 struct thermal_cooling_device *cdev = to_cooling_device(dev); 597 598 return sprintf(buf, "%ld\n", cdev->max_state); 599 } 600 601 static ssize_t cur_state_show(struct device *dev, struct device_attribute *attr, 602 char *buf) 603 { 604 struct thermal_cooling_device *cdev = to_cooling_device(dev); 605 unsigned long state; 606 int ret; 607 608 ret = cdev->ops->get_cur_state(cdev, &state); 609 if (ret) 610 return ret; 611 return sprintf(buf, "%ld\n", state); 612 } 613 614 static ssize_t 615 cur_state_store(struct device *dev, struct device_attribute *attr, 616 const char *buf, size_t count) 617 { 618 struct thermal_cooling_device *cdev = to_cooling_device(dev); 619 unsigned long state; 620 int result; 621 622 if (sscanf(buf, "%ld\n", &state) != 1) 623 return -EINVAL; 624 625 if ((long)state < 0) 626 return -EINVAL; 627 628 /* Requested state should be less than max_state + 1 */ 629 if (state > cdev->max_state) 630 return -EINVAL; 631 632 mutex_lock(&cdev->lock); 633 634 result = cdev->ops->set_cur_state(cdev, state); 635 if (!result) 636 thermal_cooling_device_stats_update(cdev, state); 637 638 mutex_unlock(&cdev->lock); 639 return result ? result : count; 640 } 641 642 static struct device_attribute 643 dev_attr_cdev_type = __ATTR(type, 0444, cdev_type_show, NULL); 644 static DEVICE_ATTR_RO(max_state); 645 static DEVICE_ATTR_RW(cur_state); 646 647 static struct attribute *cooling_device_attrs[] = { 648 &dev_attr_cdev_type.attr, 649 &dev_attr_max_state.attr, 650 &dev_attr_cur_state.attr, 651 NULL, 652 }; 653 654 static const struct attribute_group cooling_device_attr_group = { 655 .attrs = cooling_device_attrs, 656 }; 657 658 static const struct attribute_group *cooling_device_attr_groups[] = { 659 &cooling_device_attr_group, 660 NULL, /* Space allocated for cooling_device_stats_attr_group */ 661 NULL, 662 }; 663 664 #ifdef CONFIG_THERMAL_STATISTICS 665 struct cooling_dev_stats { 666 spinlock_t lock; 667 unsigned int total_trans; 668 unsigned long state; 669 ktime_t last_time; 670 ktime_t *time_in_state; 671 unsigned int *trans_table; 672 }; 673 674 static void update_time_in_state(struct cooling_dev_stats *stats) 675 { 676 ktime_t now = ktime_get(), delta; 677 678 delta = ktime_sub(now, stats->last_time); 679 stats->time_in_state[stats->state] = 680 ktime_add(stats->time_in_state[stats->state], delta); 681 stats->last_time = now; 682 } 683 684 void thermal_cooling_device_stats_update(struct thermal_cooling_device *cdev, 685 unsigned long new_state) 686 { 687 struct cooling_dev_stats *stats = cdev->stats; 688 689 lockdep_assert_held(&cdev->lock); 690 691 if (!stats) 692 return; 693 694 spin_lock(&stats->lock); 695 696 if (stats->state == new_state) 697 goto unlock; 698 699 update_time_in_state(stats); 700 stats->trans_table[stats->state * (cdev->max_state + 1) + new_state]++; 701 stats->state = new_state; 702 stats->total_trans++; 703 704 unlock: 705 spin_unlock(&stats->lock); 706 } 707 708 static ssize_t total_trans_show(struct device *dev, 709 struct device_attribute *attr, char *buf) 710 { 711 struct thermal_cooling_device *cdev = to_cooling_device(dev); 712 struct cooling_dev_stats *stats; 713 int ret = 0; 714 715 mutex_lock(&cdev->lock); 716 717 stats = cdev->stats; 718 if (!stats) 719 goto unlock; 720 721 spin_lock(&stats->lock); 722 ret = sprintf(buf, "%u\n", stats->total_trans); 723 spin_unlock(&stats->lock); 724 725 unlock: 726 mutex_unlock(&cdev->lock); 727 728 return ret; 729 } 730 731 static ssize_t 732 time_in_state_ms_show(struct device *dev, struct device_attribute *attr, 733 char *buf) 734 { 735 struct thermal_cooling_device *cdev = to_cooling_device(dev); 736 struct cooling_dev_stats *stats; 737 ssize_t len = 0; 738 int i; 739 740 mutex_lock(&cdev->lock); 741 742 stats = cdev->stats; 743 if (!stats) 744 goto unlock; 745 746 spin_lock(&stats->lock); 747 748 update_time_in_state(stats); 749 750 for (i = 0; i <= cdev->max_state; i++) { 751 len += sprintf(buf + len, "state%u\t%llu\n", i, 752 ktime_to_ms(stats->time_in_state[i])); 753 } 754 spin_unlock(&stats->lock); 755 756 unlock: 757 mutex_unlock(&cdev->lock); 758 759 return len; 760 } 761 762 static ssize_t 763 reset_store(struct device *dev, struct device_attribute *attr, const char *buf, 764 size_t count) 765 { 766 struct thermal_cooling_device *cdev = to_cooling_device(dev); 767 struct cooling_dev_stats *stats; 768 int i, states; 769 770 mutex_lock(&cdev->lock); 771 772 stats = cdev->stats; 773 if (!stats) 774 goto unlock; 775 776 states = cdev->max_state + 1; 777 778 spin_lock(&stats->lock); 779 780 stats->total_trans = 0; 781 stats->last_time = ktime_get(); 782 memset(stats->trans_table, 0, 783 states * states * sizeof(*stats->trans_table)); 784 785 for (i = 0; i < states; i++) 786 stats->time_in_state[i] = ktime_set(0, 0); 787 788 spin_unlock(&stats->lock); 789 790 unlock: 791 mutex_unlock(&cdev->lock); 792 793 return count; 794 } 795 796 static ssize_t trans_table_show(struct device *dev, 797 struct device_attribute *attr, char *buf) 798 { 799 struct thermal_cooling_device *cdev = to_cooling_device(dev); 800 struct cooling_dev_stats *stats; 801 ssize_t len = 0; 802 int i, j; 803 804 mutex_lock(&cdev->lock); 805 806 stats = cdev->stats; 807 if (!stats) { 808 len = -ENODATA; 809 goto unlock; 810 } 811 812 len += snprintf(buf + len, PAGE_SIZE - len, " From : To\n"); 813 len += snprintf(buf + len, PAGE_SIZE - len, " : "); 814 for (i = 0; i <= cdev->max_state; i++) { 815 if (len >= PAGE_SIZE) 816 break; 817 len += snprintf(buf + len, PAGE_SIZE - len, "state%2u ", i); 818 } 819 if (len >= PAGE_SIZE) { 820 len = PAGE_SIZE; 821 goto unlock; 822 } 823 824 len += snprintf(buf + len, PAGE_SIZE - len, "\n"); 825 826 for (i = 0; i <= cdev->max_state; i++) { 827 if (len >= PAGE_SIZE) 828 break; 829 830 len += snprintf(buf + len, PAGE_SIZE - len, "state%2u:", i); 831 832 for (j = 0; j <= cdev->max_state; j++) { 833 if (len >= PAGE_SIZE) 834 break; 835 len += snprintf(buf + len, PAGE_SIZE - len, "%8u ", 836 stats->trans_table[i * (cdev->max_state + 1) + j]); 837 } 838 if (len >= PAGE_SIZE) 839 break; 840 len += snprintf(buf + len, PAGE_SIZE - len, "\n"); 841 } 842 843 if (len >= PAGE_SIZE) { 844 pr_warn_once("Thermal transition table exceeds PAGE_SIZE. Disabling\n"); 845 len = -EFBIG; 846 } 847 848 unlock: 849 mutex_unlock(&cdev->lock); 850 851 return len; 852 } 853 854 static DEVICE_ATTR_RO(total_trans); 855 static DEVICE_ATTR_RO(time_in_state_ms); 856 static DEVICE_ATTR_WO(reset); 857 static DEVICE_ATTR_RO(trans_table); 858 859 static struct attribute *cooling_device_stats_attrs[] = { 860 &dev_attr_total_trans.attr, 861 &dev_attr_time_in_state_ms.attr, 862 &dev_attr_reset.attr, 863 &dev_attr_trans_table.attr, 864 NULL 865 }; 866 867 static const struct attribute_group cooling_device_stats_attr_group = { 868 .attrs = cooling_device_stats_attrs, 869 .name = "stats" 870 }; 871 872 static void cooling_device_stats_setup(struct thermal_cooling_device *cdev) 873 { 874 const struct attribute_group *stats_attr_group = NULL; 875 struct cooling_dev_stats *stats; 876 /* Total number of states is highest state + 1 */ 877 unsigned long states = cdev->max_state + 1; 878 int var; 879 880 var = sizeof(*stats); 881 var += sizeof(*stats->time_in_state) * states; 882 var += sizeof(*stats->trans_table) * states * states; 883 884 stats = kzalloc(var, GFP_KERNEL); 885 if (!stats) 886 goto out; 887 888 stats->time_in_state = (ktime_t *)(stats + 1); 889 stats->trans_table = (unsigned int *)(stats->time_in_state + states); 890 cdev->stats = stats; 891 stats->last_time = ktime_get(); 892 893 spin_lock_init(&stats->lock); 894 895 stats_attr_group = &cooling_device_stats_attr_group; 896 897 out: 898 /* Fill the empty slot left in cooling_device_attr_groups */ 899 var = ARRAY_SIZE(cooling_device_attr_groups) - 2; 900 cooling_device_attr_groups[var] = stats_attr_group; 901 } 902 903 static void cooling_device_stats_destroy(struct thermal_cooling_device *cdev) 904 { 905 kfree(cdev->stats); 906 cdev->stats = NULL; 907 } 908 909 #else 910 911 static inline void 912 cooling_device_stats_setup(struct thermal_cooling_device *cdev) {} 913 static inline void 914 cooling_device_stats_destroy(struct thermal_cooling_device *cdev) {} 915 916 #endif /* CONFIG_THERMAL_STATISTICS */ 917 918 void thermal_cooling_device_setup_sysfs(struct thermal_cooling_device *cdev) 919 { 920 cooling_device_stats_setup(cdev); 921 cdev->device.groups = cooling_device_attr_groups; 922 } 923 924 void thermal_cooling_device_destroy_sysfs(struct thermal_cooling_device *cdev) 925 { 926 cooling_device_stats_destroy(cdev); 927 } 928 929 void thermal_cooling_device_stats_reinit(struct thermal_cooling_device *cdev) 930 { 931 lockdep_assert_held(&cdev->lock); 932 933 cooling_device_stats_destroy(cdev); 934 cooling_device_stats_setup(cdev); 935 } 936 937 /* these helper will be used only at the time of bindig */ 938 ssize_t 939 trip_point_show(struct device *dev, struct device_attribute *attr, char *buf) 940 { 941 struct thermal_instance *instance; 942 943 instance = 944 container_of(attr, struct thermal_instance, attr); 945 946 return sprintf(buf, "%d\n", instance->trip); 947 } 948 949 ssize_t 950 weight_show(struct device *dev, struct device_attribute *attr, char *buf) 951 { 952 struct thermal_instance *instance; 953 954 instance = container_of(attr, struct thermal_instance, weight_attr); 955 956 return sprintf(buf, "%d\n", instance->weight); 957 } 958 959 ssize_t weight_store(struct device *dev, struct device_attribute *attr, 960 const char *buf, size_t count) 961 { 962 struct thermal_instance *instance; 963 int ret, weight; 964 965 ret = kstrtoint(buf, 0, &weight); 966 if (ret) 967 return ret; 968 969 instance = container_of(attr, struct thermal_instance, weight_attr); 970 instance->weight = weight; 971 972 return count; 973 } 974