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