drivers/thermal/thermal_sysfs.c

   1 /*
   2  *  thermal.c - sysfs interface of thermal devices
   3  *
   4  *  Copyright (C) 2016 Eduardo Valentin <edubezval@gmail.com>
   5  *
   6  *  Highly based on original thermal_core.c
   7  *  Copyright (C) 2008 Intel Corp
   8  *  Copyright (C) 2008 Zhang Rui <rui.zhang@intel.com>
   9  *  Copyright (C) 2008 Sujith Thomas <sujith.thomas@intel.com>
  10  *
  11  *  This program is free software; you can redistribute it and/or modify
  12  *  it under the terms of the GNU General Public License as published by
  13  *  the Free Software Foundation; version 2 of the License.
  14  */
  15
  16 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
  17
  18 #include <linux/sysfs.h>
  19 #include <linux/device.h>
  20 #include <linux/err.h>
  21 #include <linux/slab.h>
  22 #include <linux/string.h>
  23
  24 #include "thermal_core.h"
  25
  26 /* sys I/F for thermal zone */
  27
  28 static ssize_t
  29 type_show(struct device *dev, struct device_attribute *attr, char *buf)
  30 {
  31         struct thermal_zone_device *tz = to_thermal_zone(dev);
  32
  33         return sprintf(buf, "%s\n", tz->type);
  34 }
  35
  36 static ssize_t
  37 temp_show(struct device *dev, struct device_attribute *attr, char *buf)
  38 {
  39         struct thermal_zone_device *tz = to_thermal_zone(dev);
  40         int temperature, ret;
  41
  42         ret = thermal_zone_get_temp(tz, &temperature);
  43
  44         if (ret)
  45                 return ret;
  46
  47         return sprintf(buf, "%d\n", temperature);
  48 }
  49
  50 static ssize_t
  51 mode_show(struct device *dev, struct device_attribute *attr, char *buf)
  52 {
  53         struct thermal_zone_device *tz = to_thermal_zone(dev);
  54         enum thermal_device_mode mode;
  55         int result;
  56
  57         if (!tz->ops->get_mode)
  58                 return -EPERM;
  59
  60         result = tz->ops->get_mode(tz, &mode);
  61         if (result)
  62                 return result;
  63
  64         return sprintf(buf, "%s\n", mode == THERMAL_DEVICE_ENABLED ? "enabled"
  65                        : "disabled");
  66 }
  67
  68 static ssize_t
  69 mode_store(struct device *dev, struct device_attribute *attr,
  70            const char *buf, size_t count)
  71 {
  72         struct thermal_zone_device *tz = to_thermal_zone(dev);
  73         int result;
  74
  75         if (!tz->ops->set_mode)
  76                 return -EPERM;
  77
  78         if (!strncmp(buf, "enabled", sizeof("enabled") - 1))
  79                 result = tz->ops->set_mode(tz, THERMAL_DEVICE_ENABLED);
  80         else if (!strncmp(buf, "disabled", sizeof("disabled") - 1))
  81                 result = tz->ops->set_mode(tz, THERMAL_DEVICE_DISABLED);
  82         else
  83                 result = -EINVAL;
  84
  85         if (result)
  86                 return result;
  87
  88         return count;
  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_zone_device *tz = to_thermal_zone(dev);
  96         enum thermal_trip_type type;
  97         int trip, result;
  98
  99         if (!tz->ops->get_trip_type)
 100                 return -EPERM;
 101
 102         if (sscanf(attr->attr.name, "trip_point_%d_type", &trip) != 1)
 103                 return -EINVAL;
 104
 105         result = tz->ops->get_trip_type(tz, trip, &type);
 106         if (result)
 107                 return result;
 108
 109         switch (type) {
 110         case THERMAL_TRIP_CRITICAL:
 111                 return sprintf(buf, "critical\n");
 112         case THERMAL_TRIP_HOT:
 113                 return sprintf(buf, "hot\n");
 114         case THERMAL_TRIP_PASSIVE:
 115                 return sprintf(buf, "passive\n");
 116         case THERMAL_TRIP_ACTIVE:
 117                 return sprintf(buf, "active\n");
 118         default:
 119                 return sprintf(buf, "unknown\n");
 120         }
 121 }
 122
 123 static ssize_t
 124 trip_point_temp_store(struct device *dev, struct device_attribute *attr,
 125                       const char *buf, size_t count)
 126 {
 127         struct thermal_zone_device *tz = to_thermal_zone(dev);
 128         int trip, ret;
 129         int temperature;
 130
 131         if (!tz->ops->set_trip_temp)
 132                 return -EPERM;
 133
 134         if (sscanf(attr->attr.name, "trip_point_%d_temp", &trip) != 1)
 135                 return -EINVAL;
 136
 137         if (kstrtoint(buf, 10, &temperature))
 138                 return -EINVAL;
 139
 140         ret = tz->ops->set_trip_temp(tz, trip, temperature);
 141         if (ret)
 142                 return ret;
 143
 144         thermal_zone_device_update(tz, THERMAL_EVENT_UNSPECIFIED);
 145
 146         return count;
 147 }
 148
 149 static ssize_t
 150 trip_point_temp_show(struct device *dev, struct device_attribute *attr,
 151                      char *buf)
 152 {
 153         struct thermal_zone_device *tz = to_thermal_zone(dev);
 154         int trip, ret;
 155         int temperature;
 156
 157         if (!tz->ops->get_trip_temp)
 158                 return -EPERM;
 159
 160         if (sscanf(attr->attr.name, "trip_point_%d_temp", &trip) != 1)
 161                 return -EINVAL;
 162
 163         ret = tz->ops->get_trip_temp(tz, trip, &temperature);
 164
 165         if (ret)
 166                 return ret;
 167
 168         return sprintf(buf, "%d\n", temperature);
 169 }
 170
 171 static ssize_t
 172 trip_point_hyst_store(struct device *dev, struct device_attribute *attr,
 173                       const char *buf, size_t count)
 174 {
 175         struct thermal_zone_device *tz = to_thermal_zone(dev);
 176         int trip, ret;
 177         int temperature;
 178
 179         if (!tz->ops->set_trip_hyst)
 180                 return -EPERM;
 181
 182         if (sscanf(attr->attr.name, "trip_point_%d_hyst", &trip) != 1)
 183                 return -EINVAL;
 184
 185         if (kstrtoint(buf, 10, &temperature))
 186                 return -EINVAL;
 187
 188         /*
 189          * We are not doing any check on the 'temperature' value
 190          * here. The driver implementing 'set_trip_hyst' has to
 191          * take care of this.
 192          */
 193         ret = tz->ops->set_trip_hyst(tz, trip, temperature);
 194
 195         if (!ret)
 196                 thermal_zone_set_trips(tz);
 197
 198         return ret ? ret : count;
 199 }
 200
 201 static ssize_t
 202 trip_point_hyst_show(struct device *dev, struct device_attribute *attr,
 203                      char *buf)
 204 {
 205         struct thermal_zone_device *tz = to_thermal_zone(dev);
 206         int trip, ret;
 207         int temperature;
 208
 209         if (!tz->ops->get_trip_hyst)
 210                 return -EPERM;
 211
 212         if (sscanf(attr->attr.name, "trip_point_%d_hyst", &trip) != 1)
 213                 return -EINVAL;
 214
 215         ret = tz->ops->get_trip_hyst(tz, trip, &temperature);
 216
 217         return ret ? ret : sprintf(buf, "%d\n", temperature);
 218 }
 219
 220 static ssize_t
 221 passive_store(struct device *dev, struct device_attribute *attr,
 222               const char *buf, size_t count)
 223 {
 224         struct thermal_zone_device *tz = to_thermal_zone(dev);
 225         int state;
 226
 227         if (sscanf(buf, "%d\n", &state) != 1)
 228                 return -EINVAL;
 229
 230         /* sanity check: values below 1000 millicelcius don't make sense
 231          * and can cause the system to go into a thermal heart attack
 232          */
 233         if (state && state < 1000)
 234                 return -EINVAL;
 235
 236         if (state && !tz->forced_passive) {
 237                 if (!tz->passive_delay)
 238                         tz->passive_delay = 1000;
 239                 thermal_zone_device_rebind_exception(tz, "Processor",
 240                                                      sizeof("Processor"));
 241         } else if (!state && tz->forced_passive) {
 242                 tz->passive_delay = 0;
 243                 thermal_zone_device_unbind_exception(tz, "Processor",
 244                                                      sizeof("Processor"));
 245         }
 246
 247         tz->forced_passive = state;
 248
 249         thermal_zone_device_update(tz, THERMAL_EVENT_UNSPECIFIED);
 250
 251         return count;
 252 }
 253
 254 static ssize_t
 255 passive_show(struct device *dev, struct device_attribute *attr,
 256              char *buf)
 257 {
 258         struct thermal_zone_device *tz = to_thermal_zone(dev);
 259
 260         return sprintf(buf, "%d\n", tz->forced_passive);
 261 }
 262
 263 static ssize_t
 264 policy_store(struct device *dev, struct device_attribute *attr,
 265              const char *buf, size_t count)
 266 {
 267         struct thermal_zone_device *tz = to_thermal_zone(dev);
 268         char name[THERMAL_NAME_LENGTH];
 269         int ret;
 270
 271         snprintf(name, sizeof(name), "%s", buf);
 272
 273         ret = thermal_zone_device_set_policy(tz, name);
 274         if (!ret)
 275                 ret = count;
 276
 277         return ret;
 278 }
 279
 280 static ssize_t
 281 policy_show(struct device *dev, struct device_attribute *devattr, char *buf)
 282 {
 283         struct thermal_zone_device *tz = to_thermal_zone(dev);
 284
 285         return sprintf(buf, "%s\n", tz->governor->name);
 286 }
 287
 288 static ssize_t
 289 available_policies_show(struct device *dev, struct device_attribute *devattr,
 290                         char *buf)
 291 {
 292         return thermal_build_list_of_policies(buf);
 293 }
 294
 295 #if (IS_ENABLED(CONFIG_THERMAL_EMULATION))
 296 static ssize_t
 297 emul_temp_store(struct device *dev, struct device_attribute *attr,
 298                 const char *buf, size_t count)
 299 {
 300         struct thermal_zone_device *tz = to_thermal_zone(dev);
 301         int ret = 0;
 302         int temperature;
 303
 304         if (kstrtoint(buf, 10, &temperature))
 305                 return -EINVAL;
 306
 307         if (!tz->ops->set_emul_temp) {
 308                 mutex_lock(&tz->lock);
 309                 tz->emul_temperature = temperature;
 310                 mutex_unlock(&tz->lock);
 311         } else {
 312                 ret = tz->ops->set_emul_temp(tz, temperature);
 313         }
 314
 315         if (!ret)
 316                 thermal_zone_device_update(tz, THERMAL_EVENT_UNSPECIFIED);
 317
 318         return ret ? ret : count;
 319 }
 320 static DEVICE_ATTR(emul_temp, S_IWUSR, NULL, emul_temp_store);
 321 #endif
 322
 323 static ssize_t
 324 sustainable_power_show(struct device *dev, struct device_attribute *devattr,
 325                        char *buf)
 326 {
 327         struct thermal_zone_device *tz = to_thermal_zone(dev);
 328
 329         if (tz->tzp)
 330                 return sprintf(buf, "%u\n", tz->tzp->sustainable_power);
 331         else
 332                 return -EIO;
 333 }
 334
 335 static ssize_t
 336 sustainable_power_store(struct device *dev, struct device_attribute *devattr,
 337                         const char *buf, size_t count)
 338 {
 339         struct thermal_zone_device *tz = to_thermal_zone(dev);
 340         u32 sustainable_power;
 341
 342         if (!tz->tzp)
 343                 return -EIO;
 344
 345         if (kstrtou32(buf, 10, &sustainable_power))
 346                 return -EINVAL;
 347
 348         tz->tzp->sustainable_power = sustainable_power;
 349
 350         return count;
 351 }
 352
 353 #define create_s32_tzp_attr(name)                                       \
 354         static ssize_t                                                  \
 355         name##_show(struct device *dev, struct device_attribute *devattr, \
 356                 char *buf)                                              \
 357         {                                                               \
 358         struct thermal_zone_device *tz = to_thermal_zone(dev);          \
 359                                                                         \
 360         if (tz->tzp)                                                    \
 361                 return sprintf(buf, "%d\n", tz->tzp->name);             \
 362         else                                                            \
 363                 return -EIO;                                            \
 364         }                                                               \
 365                                                                         \
 366         static ssize_t                                                  \
 367         name##_store(struct device *dev, struct device_attribute *devattr, \
 368                 const char *buf, size_t count)                          \
 369         {                                                               \
 370                 struct thermal_zone_device *tz = to_thermal_zone(dev);  \
 371                 s32 value;                                              \
 372                                                                         \
 373                 if (!tz->tzp)                                           \
 374                         return -EIO;                                    \
 375                                                                         \
 376                 if (kstrtos32(buf, 10, &value))                         \
 377                         return -EINVAL;                                 \
 378                                                                         \
 379                 tz->tzp->name = value;                                  \
 380                                                                         \
 381                 return count;                                           \
 382         }                                                               \
 383         static DEVICE_ATTR(name, S_IWUSR | S_IRUGO, name##_show, name##_store)
 384
 385 create_s32_tzp_attr(k_po);
 386 create_s32_tzp_attr(k_pu);
 387 create_s32_tzp_attr(k_i);
 388 create_s32_tzp_attr(k_d);
 389 create_s32_tzp_attr(integral_cutoff);
 390 create_s32_tzp_attr(slope);
 391 create_s32_tzp_attr(offset);
 392 #undef create_s32_tzp_attr
 393
 394 /*
 395  * These are thermal zone device attributes that will always be present.
 396  * All the attributes created for tzp (create_s32_tzp_attr) also are always
 397  * present on the sysfs interface.
 398  */
 399 static DEVICE_ATTR(type, 0444, type_show, NULL);
 400 static DEVICE_ATTR(temp, 0444, temp_show, NULL);
 401 static DEVICE_ATTR(policy, S_IRUGO | S_IWUSR, policy_show, policy_store);
 402 static DEVICE_ATTR(available_policies, S_IRUGO, available_policies_show, NULL);
 403 static DEVICE_ATTR(sustainable_power, S_IWUSR | S_IRUGO, sustainable_power_show,
 404                    sustainable_power_store);
 405
 406 /* These thermal zone device attributes are created based on conditions */
 407 static DEVICE_ATTR(mode, 0644, mode_show, mode_store);
 408 static DEVICE_ATTR(passive, S_IRUGO | S_IWUSR, passive_show, passive_store);
 409
 410 /* These attributes are unconditionally added to a thermal zone */
 411 static struct attribute *thermal_zone_dev_attrs[] = {
 412         &dev_attr_type.attr,
 413         &dev_attr_temp.attr,
 414 #if (IS_ENABLED(CONFIG_THERMAL_EMULATION))
 415         &dev_attr_emul_temp.attr,
 416 #endif
 417         &dev_attr_policy.attr,
 418         &dev_attr_available_policies.attr,
 419         &dev_attr_sustainable_power.attr,
 420         &dev_attr_k_po.attr,
 421         &dev_attr_k_pu.attr,
 422         &dev_attr_k_i.attr,
 423         &dev_attr_k_d.attr,
 424         &dev_attr_integral_cutoff.attr,
 425         &dev_attr_slope.attr,
 426         &dev_attr_offset.attr,
 427         NULL,
 428 };
 429
 430 static struct attribute_group thermal_zone_attribute_group = {
 431         .attrs = thermal_zone_dev_attrs,
 432 };
 433
 434 /* We expose mode only if .get_mode is present */
 435 static struct attribute *thermal_zone_mode_attrs[] = {
 436         &dev_attr_mode.attr,
 437         NULL,
 438 };
 439
 440 static umode_t thermal_zone_mode_is_visible(struct kobject *kobj,
 441                                             struct attribute *attr,
 442                                             int attrno)
 443 {
 444         struct device *dev = container_of(kobj, struct device, kobj);
 445         struct thermal_zone_device *tz;
 446
 447         tz = container_of(dev, struct thermal_zone_device, device);
 448
 449         if (tz->ops->get_mode)
 450                 return attr->mode;
 451
 452         return 0;
 453 }
 454
 455 static struct attribute_group thermal_zone_mode_attribute_group = {
 456         .attrs = thermal_zone_mode_attrs,
 457         .is_visible = thermal_zone_mode_is_visible,
 458 };
 459
 460 /* We expose passive only if passive trips are present */
 461 static struct attribute *thermal_zone_passive_attrs[] = {
 462         &dev_attr_passive.attr,
 463         NULL,
 464 };
 465
 466 static umode_t thermal_zone_passive_is_visible(struct kobject *kobj,
 467                                                struct attribute *attr,
 468                                                int attrno)
 469 {
 470         struct device *dev = container_of(kobj, struct device, kobj);
 471         struct thermal_zone_device *tz;
 472         enum thermal_trip_type trip_type;
 473         int count, passive = 0;
 474
 475         tz = container_of(dev, struct thermal_zone_device, device);
 476
 477         for (count = 0; count < tz->trips && !passive; count++) {
 478                 tz->ops->get_trip_type(tz, count, &trip_type);
 479
 480                 if (trip_type == THERMAL_TRIP_PASSIVE)
 481                         passive = 1;
 482         }
 483
 484         if (!passive)
 485                 return attr->mode;
 486
 487         return 0;
 488 }
 489
 490 static struct attribute_group thermal_zone_passive_attribute_group = {
 491         .attrs = thermal_zone_passive_attrs,
 492         .is_visible = thermal_zone_passive_is_visible,
 493 };
 494
 495 static const struct attribute_group *thermal_zone_attribute_groups[] = {
 496         &thermal_zone_attribute_group,
 497         &thermal_zone_mode_attribute_group,
 498         &thermal_zone_passive_attribute_group,
 499         /* This is not NULL terminated as we create the group dynamically */
 500 };
 501
 502 /**
 503  * create_trip_attrs() - create attributes for trip points
 504  * @tz:         the thermal zone device
 505  * @mask:       Writeable trip point bitmap.
 506  *
 507  * helper function to instantiate sysfs entries for every trip
 508  * point and its properties of a struct thermal_zone_device.
 509  *
 510  * Return: 0 on success, the proper error value otherwise.
 511  */
 512 static int create_trip_attrs(struct thermal_zone_device *tz, int mask)
 513 {
 514         struct attribute **attrs;
 515         int indx;
 516
 517         /* This function works only for zones with at least one trip */
 518         if (tz->trips <= 0)
 519                 return -EINVAL;
 520
 521         tz->trip_type_attrs = kcalloc(tz->trips, sizeof(*tz->trip_type_attrs),
 522                                       GFP_KERNEL);
 523         if (!tz->trip_type_attrs)
 524                 return -ENOMEM;
 525
 526         tz->trip_temp_attrs = kcalloc(tz->trips, sizeof(*tz->trip_temp_attrs),
 527                                       GFP_KERNEL);
 528         if (!tz->trip_temp_attrs) {
 529                 kfree(tz->trip_type_attrs);
 530                 return -ENOMEM;
 531         }
 532
 533         if (tz->ops->get_trip_hyst) {
 534                 tz->trip_hyst_attrs = kcalloc(tz->trips,
 535                                               sizeof(*tz->trip_hyst_attrs),
 536                                               GFP_KERNEL);
 537                 if (!tz->trip_hyst_attrs) {
 538                         kfree(tz->trip_type_attrs);
 539                         kfree(tz->trip_temp_attrs);
 540                         return -ENOMEM;
 541                 }
 542         }
 543
 544         attrs = kcalloc(tz->trips * 3 + 1, sizeof(*attrs), GFP_KERNEL);
 545         if (!attrs) {
 546                 kfree(tz->trip_type_attrs);
 547                 kfree(tz->trip_temp_attrs);
 548                 if (tz->ops->get_trip_hyst)
 549                         kfree(tz->trip_hyst_attrs);
 550                 return -ENOMEM;
 551         }
 552
 553         for (indx = 0; indx < tz->trips; indx++) {
 554                 /* create trip type attribute */
 555                 snprintf(tz->trip_type_attrs[indx].name, THERMAL_NAME_LENGTH,
 556                          "trip_point_%d_type", indx);
 557
 558                 sysfs_attr_init(&tz->trip_type_attrs[indx].attr.attr);
 559                 tz->trip_type_attrs[indx].attr.attr.name =
 560                                                 tz->trip_type_attrs[indx].name;
 561                 tz->trip_type_attrs[indx].attr.attr.mode = S_IRUGO;
 562                 tz->trip_type_attrs[indx].attr.show = trip_point_type_show;
 563                 attrs[indx] = &tz->trip_type_attrs[indx].attr.attr;
 564
 565                 /* create trip temp attribute */
 566                 snprintf(tz->trip_temp_attrs[indx].name, THERMAL_NAME_LENGTH,
 567                          "trip_point_%d_temp", indx);
 568
 569                 sysfs_attr_init(&tz->trip_temp_attrs[indx].attr.attr);
 570                 tz->trip_temp_attrs[indx].attr.attr.name =
 571                                                 tz->trip_temp_attrs[indx].name;
 572                 tz->trip_temp_attrs[indx].attr.attr.mode = S_IRUGO;
 573                 tz->trip_temp_attrs[indx].attr.show = trip_point_temp_show;
 574                 if (IS_ENABLED(CONFIG_THERMAL_WRITABLE_TRIPS) &&
 575                     mask & (1 << indx)) {
 576                         tz->trip_temp_attrs[indx].attr.attr.mode |= S_IWUSR;
 577                         tz->trip_temp_attrs[indx].attr.store =
 578                                                         trip_point_temp_store;
 579                 }
 580                 attrs[indx + tz->trips] = &tz->trip_temp_attrs[indx].attr.attr;
 581
 582                 /* create Optional trip hyst attribute */
 583                 if (!tz->ops->get_trip_hyst)
 584                         continue;
 585                 snprintf(tz->trip_hyst_attrs[indx].name, THERMAL_NAME_LENGTH,
 586                          "trip_point_%d_hyst", indx);
 587
 588                 sysfs_attr_init(&tz->trip_hyst_attrs[indx].attr.attr);
 589                 tz->trip_hyst_attrs[indx].attr.attr.name =
 590                                         tz->trip_hyst_attrs[indx].name;
 591                 tz->trip_hyst_attrs[indx].attr.attr.mode = S_IRUGO;
 592                 tz->trip_hyst_attrs[indx].attr.show = trip_point_hyst_show;
 593                 if (tz->ops->set_trip_hyst) {
 594                         tz->trip_hyst_attrs[indx].attr.attr.mode |= S_IWUSR;
 595                         tz->trip_hyst_attrs[indx].attr.store =
 596                                         trip_point_hyst_store;
 597                 }
 598                 attrs[indx + tz->trips * 2] =
 599                                         &tz->trip_hyst_attrs[indx].attr.attr;
 600         }
 601         attrs[tz->trips * 3] = NULL;
 602
 603         tz->trips_attribute_group.attrs = attrs;
 604
 605         return 0;
 606 }
 607
 608 int thermal_zone_create_device_groups(struct thermal_zone_device *tz,
 609                                       int mask)
 610 {
 611         const struct attribute_group **groups;
 612         int i, size, result;
 613
 614         /* we need one extra for trips and the NULL to terminate the array */
 615         size = ARRAY_SIZE(thermal_zone_attribute_groups) + 2;
 616         /* This also takes care of API requirement to be NULL terminated */
 617         groups = kcalloc(size, sizeof(*groups), GFP_KERNEL);
 618         if (!groups)
 619                 return -ENOMEM;
 620
 621         for (i = 0; i < size - 2; i++)
 622                 groups[i] = thermal_zone_attribute_groups[i];
 623
 624         if (tz->trips) {
 625                 result = create_trip_attrs(tz, mask);
 626                 if (result) {
 627                         kfree(groups);
 628
 629                         return result;
 630                 }
 631
 632                 groups[size - 2] = &tz->trips_attribute_group;
 633         }
 634
 635         tz->device.groups = groups;
 636
 637         return 0;
 638 }
 639
 640 /* sys I/F for cooling device */
 641 static ssize_t
 642 thermal_cooling_device_type_show(struct device *dev,
 643                                  struct device_attribute *attr, char *buf)
 644 {
 645         struct thermal_cooling_device *cdev = to_cooling_device(dev);
 646
 647         return sprintf(buf, "%s\n", cdev->type);
 648 }
 649
 650 static ssize_t
 651 thermal_cooling_device_max_state_show(struct device *dev,
 652                                       struct device_attribute *attr, char *buf)
 653 {
 654         struct thermal_cooling_device *cdev = to_cooling_device(dev);
 655         unsigned long state;
 656         int ret;
 657
 658         ret = cdev->ops->get_max_state(cdev, &state);
 659         if (ret)
 660                 return ret;
 661         return sprintf(buf, "%ld\n", state);
 662 }
 663
 664 static ssize_t
 665 thermal_cooling_device_cur_state_show(struct device *dev,
 666                                       struct device_attribute *attr, char *buf)
 667 {
 668         struct thermal_cooling_device *cdev = to_cooling_device(dev);
 669         unsigned long state;
 670         int ret;
 671
 672         ret = cdev->ops->get_cur_state(cdev, &state);
 673         if (ret)
 674                 return ret;
 675         return sprintf(buf, "%ld\n", state);
 676 }
 677
 678 static ssize_t
 679 thermal_cooling_device_cur_state_store(struct device *dev,
 680                                        struct device_attribute *attr,
 681                                        const char *buf, size_t count)
 682 {
 683         struct thermal_cooling_device *cdev = to_cooling_device(dev);
 684         unsigned long state;
 685         int result;
 686
 687         if (sscanf(buf, "%ld\n", &state) != 1)
 688                 return -EINVAL;
 689
 690         if ((long)state < 0)
 691                 return -EINVAL;
 692
 693         result = cdev->ops->set_cur_state(cdev, state);
 694         if (result)
 695                 return result;
 696         return count;
 697 }
 698
 699 static struct device_attribute dev_attr_cdev_type =
 700 __ATTR(type, 0444, thermal_cooling_device_type_show, NULL);
 701 static DEVICE_ATTR(max_state, 0444,
 702                    thermal_cooling_device_max_state_show, NULL);
 703 static DEVICE_ATTR(cur_state, 0644,
 704                    thermal_cooling_device_cur_state_show,
 705                    thermal_cooling_device_cur_state_store);
 706
 707 static struct attribute *cooling_device_attrs[] = {
 708         &dev_attr_cdev_type.attr,
 709         &dev_attr_max_state.attr,
 710         &dev_attr_cur_state.attr,
 711         NULL,
 712 };
 713
 714 static const struct attribute_group cooling_device_attr_group = {
 715         .attrs = cooling_device_attrs,
 716 };
 717
 718 static const struct attribute_group *cooling_device_attr_groups[] = {
 719         &cooling_device_attr_group,
 720         NULL,
 721 };
 722
 723 void thermal_cooling_device_setup_sysfs(struct thermal_cooling_device *cdev)
 724 {
 725         cdev->device.groups = cooling_device_attr_groups;
 726 }
 727
 728 /* these helper will be used only at the time of bindig */
 729 ssize_t
 730 thermal_cooling_device_trip_point_show(struct device *dev,
 731                                        struct device_attribute *attr, char *buf)
 732 {
 733         struct thermal_instance *instance;
 734
 735         instance =
 736             container_of(attr, struct thermal_instance, attr);
 737
 738         if (instance->trip == THERMAL_TRIPS_NONE)
 739                 return sprintf(buf, "-1\n");
 740         else
 741                 return sprintf(buf, "%d\n", instance->trip);
 742 }
 743
 744 ssize_t
 745 thermal_cooling_device_weight_show(struct device *dev,
 746                                    struct device_attribute *attr, char *buf)
 747 {
 748         struct thermal_instance *instance;
 749
 750         instance = container_of(attr, struct thermal_instance, weight_attr);
 751
 752         return sprintf(buf, "%d\n", instance->weight);
 753 }
 754
 755 ssize_t
 756 thermal_cooling_device_weight_store(struct device *dev,
 757                                     struct device_attribute *attr,
 758                                     const char *buf, size_t count)
 759 {
 760         struct thermal_instance *instance;
 761         int ret, weight;
 762
 763         ret = kstrtoint(buf, 0, &weight);
 764         if (ret)
 765                 return ret;
 766
 767         instance = container_of(attr, struct thermal_instance, weight_attr);
 768         instance->weight = weight;
 769
 770         return count;
 771 }