drivers/thermal/thermal_sysfs.c

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