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