linux/drivers/thermal/thermal_sys.c
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   1/*
   2 *  thermal.c - Generic Thermal Management Sysfs support.
   3 *
   4 *  Copyright (C) 2008 Intel Corp
   5 *  Copyright (C) 2008 Zhang Rui <rui.zhang@intel.com>
   6 *  Copyright (C) 2008 Sujith Thomas <sujith.thomas@intel.com>
   7 *
   8 *  ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
   9 *
  10 *  This program is free software; you can redistribute it and/or modify
  11 *  it under the terms of the GNU General Public License as published by
  12 *  the Free Software Foundation; version 2 of the License.
  13 *
  14 *  This program is distributed in the hope that it will be useful, but
  15 *  WITHOUT ANY WARRANTY; without even the implied warranty of
  16 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  17 *  General Public License for more details.
  18 *
  19 *  You should have received a copy of the GNU General Public License along
  20 *  with this program; if not, write to the Free Software Foundation, Inc.,
  21 *  59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
  22 *
  23 * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
  24 */
  25
  26#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
  27
  28#include <linux/module.h>
  29#include <linux/device.h>
  30#include <linux/err.h>
  31#include <linux/slab.h>
  32#include <linux/kdev_t.h>
  33#include <linux/idr.h>
  34#include <linux/thermal.h>
  35#include <linux/spinlock.h>
  36#include <linux/reboot.h>
  37#include <net/netlink.h>
  38#include <net/genetlink.h>
  39
  40MODULE_AUTHOR("Zhang Rui");
  41MODULE_DESCRIPTION("Generic thermal management sysfs support");
  42MODULE_LICENSE("GPL");
  43
  44#define THERMAL_NO_TARGET -1UL
  45/*
  46 * This structure is used to describe the behavior of
  47 * a certain cooling device on a certain trip point
  48 * in a certain thermal zone
  49 */
  50struct thermal_instance {
  51        int id;
  52        char name[THERMAL_NAME_LENGTH];
  53        struct thermal_zone_device *tz;
  54        struct thermal_cooling_device *cdev;
  55        int trip;
  56        unsigned long upper;    /* Highest cooling state for this trip point */
  57        unsigned long lower;    /* Lowest cooling state for this trip point */
  58        unsigned long target;   /* expected cooling state */
  59        char attr_name[THERMAL_NAME_LENGTH];
  60        struct device_attribute attr;
  61        struct list_head tz_node; /* node in tz->thermal_instances */
  62        struct list_head cdev_node; /* node in cdev->thermal_instances */
  63};
  64
  65static DEFINE_IDR(thermal_tz_idr);
  66static DEFINE_IDR(thermal_cdev_idr);
  67static DEFINE_MUTEX(thermal_idr_lock);
  68
  69static LIST_HEAD(thermal_tz_list);
  70static LIST_HEAD(thermal_cdev_list);
  71static DEFINE_MUTEX(thermal_list_lock);
  72
  73static int get_idr(struct idr *idr, struct mutex *lock, int *id)
  74{
  75        int err;
  76
  77again:
  78        if (unlikely(idr_pre_get(idr, GFP_KERNEL) == 0))
  79                return -ENOMEM;
  80
  81        if (lock)
  82                mutex_lock(lock);
  83        err = idr_get_new(idr, NULL, id);
  84        if (lock)
  85                mutex_unlock(lock);
  86        if (unlikely(err == -EAGAIN))
  87                goto again;
  88        else if (unlikely(err))
  89                return err;
  90
  91        *id = *id & MAX_IDR_MASK;
  92        return 0;
  93}
  94
  95static void release_idr(struct idr *idr, struct mutex *lock, int id)
  96{
  97        if (lock)
  98                mutex_lock(lock);
  99        idr_remove(idr, id);
 100        if (lock)
 101                mutex_unlock(lock);
 102}
 103
 104/* sys I/F for thermal zone */
 105
 106#define to_thermal_zone(_dev) \
 107        container_of(_dev, struct thermal_zone_device, device)
 108
 109static ssize_t
 110type_show(struct device *dev, struct device_attribute *attr, char *buf)
 111{
 112        struct thermal_zone_device *tz = to_thermal_zone(dev);
 113
 114        return sprintf(buf, "%s\n", tz->type);
 115}
 116
 117static ssize_t
 118temp_show(struct device *dev, struct device_attribute *attr, char *buf)
 119{
 120        struct thermal_zone_device *tz = to_thermal_zone(dev);
 121        long temperature;
 122        int ret;
 123
 124        if (!tz->ops->get_temp)
 125                return -EPERM;
 126
 127        ret = tz->ops->get_temp(tz, &temperature);
 128
 129        if (ret)
 130                return ret;
 131
 132        return sprintf(buf, "%ld\n", temperature);
 133}
 134
 135static ssize_t
 136mode_show(struct device *dev, struct device_attribute *attr, char *buf)
 137{
 138        struct thermal_zone_device *tz = to_thermal_zone(dev);
 139        enum thermal_device_mode mode;
 140        int result;
 141
 142        if (!tz->ops->get_mode)
 143                return -EPERM;
 144
 145        result = tz->ops->get_mode(tz, &mode);
 146        if (result)
 147                return result;
 148
 149        return sprintf(buf, "%s\n", mode == THERMAL_DEVICE_ENABLED ? "enabled"
 150                       : "disabled");
 151}
 152
 153static ssize_t
 154mode_store(struct device *dev, struct device_attribute *attr,
 155           const char *buf, size_t count)
 156{
 157        struct thermal_zone_device *tz = to_thermal_zone(dev);
 158        int result;
 159
 160        if (!tz->ops->set_mode)
 161                return -EPERM;
 162
 163        if (!strncmp(buf, "enabled", sizeof("enabled") - 1))
 164                result = tz->ops->set_mode(tz, THERMAL_DEVICE_ENABLED);
 165        else if (!strncmp(buf, "disabled", sizeof("disabled") - 1))
 166                result = tz->ops->set_mode(tz, THERMAL_DEVICE_DISABLED);
 167        else
 168                result = -EINVAL;
 169
 170        if (result)
 171                return result;
 172
 173        return count;
 174}
 175
 176static ssize_t
 177trip_point_type_show(struct device *dev, struct device_attribute *attr,
 178                     char *buf)
 179{
 180        struct thermal_zone_device *tz = to_thermal_zone(dev);
 181        enum thermal_trip_type type;
 182        int trip, result;
 183
 184        if (!tz->ops->get_trip_type)
 185                return -EPERM;
 186
 187        if (!sscanf(attr->attr.name, "trip_point_%d_type", &trip))
 188                return -EINVAL;
 189
 190        result = tz->ops->get_trip_type(tz, trip, &type);
 191        if (result)
 192                return result;
 193
 194        switch (type) {
 195        case THERMAL_TRIP_CRITICAL:
 196                return sprintf(buf, "critical\n");
 197        case THERMAL_TRIP_HOT:
 198                return sprintf(buf, "hot\n");
 199        case THERMAL_TRIP_PASSIVE:
 200                return sprintf(buf, "passive\n");
 201        case THERMAL_TRIP_ACTIVE:
 202                return sprintf(buf, "active\n");
 203        default:
 204                return sprintf(buf, "unknown\n");
 205        }
 206}
 207
 208static ssize_t
 209trip_point_temp_store(struct device *dev, struct device_attribute *attr,
 210                     const char *buf, size_t count)
 211{
 212        struct thermal_zone_device *tz = to_thermal_zone(dev);
 213        int trip, ret;
 214        unsigned long temperature;
 215
 216        if (!tz->ops->set_trip_temp)
 217                return -EPERM;
 218
 219        if (!sscanf(attr->attr.name, "trip_point_%d_temp", &trip))
 220                return -EINVAL;
 221
 222        if (kstrtoul(buf, 10, &temperature))
 223                return -EINVAL;
 224
 225        ret = tz->ops->set_trip_temp(tz, trip, temperature);
 226
 227        return ret ? ret : count;
 228}
 229
 230static ssize_t
 231trip_point_temp_show(struct device *dev, struct device_attribute *attr,
 232                     char *buf)
 233{
 234        struct thermal_zone_device *tz = to_thermal_zone(dev);
 235        int trip, ret;
 236        long temperature;
 237
 238        if (!tz->ops->get_trip_temp)
 239                return -EPERM;
 240
 241        if (!sscanf(attr->attr.name, "trip_point_%d_temp", &trip))
 242                return -EINVAL;
 243
 244        ret = tz->ops->get_trip_temp(tz, trip, &temperature);
 245
 246        if (ret)
 247                return ret;
 248
 249        return sprintf(buf, "%ld\n", temperature);
 250}
 251
 252static ssize_t
 253trip_point_hyst_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 trip, ret;
 258        unsigned long temperature;
 259
 260        if (!tz->ops->set_trip_hyst)
 261                return -EPERM;
 262
 263        if (!sscanf(attr->attr.name, "trip_point_%d_hyst", &trip))
 264                return -EINVAL;
 265
 266        if (kstrtoul(buf, 10, &temperature))
 267                return -EINVAL;
 268
 269        /*
 270         * We are not doing any check on the 'temperature' value
 271         * here. The driver implementing 'set_trip_hyst' has to
 272         * take care of this.
 273         */
 274        ret = tz->ops->set_trip_hyst(tz, trip, temperature);
 275
 276        return ret ? ret : count;
 277}
 278
 279static ssize_t
 280trip_point_hyst_show(struct device *dev, struct device_attribute *attr,
 281                        char *buf)
 282{
 283        struct thermal_zone_device *tz = to_thermal_zone(dev);
 284        int trip, ret;
 285        unsigned long temperature;
 286
 287        if (!tz->ops->get_trip_hyst)
 288                return -EPERM;
 289
 290        if (!sscanf(attr->attr.name, "trip_point_%d_hyst", &trip))
 291                return -EINVAL;
 292
 293        ret = tz->ops->get_trip_hyst(tz, trip, &temperature);
 294
 295        return ret ? ret : sprintf(buf, "%ld\n", temperature);
 296}
 297
 298static ssize_t
 299passive_store(struct device *dev, struct device_attribute *attr,
 300                    const char *buf, size_t count)
 301{
 302        struct thermal_zone_device *tz = to_thermal_zone(dev);
 303        struct thermal_cooling_device *cdev = NULL;
 304        int state;
 305
 306        if (!sscanf(buf, "%d\n", &state))
 307                return -EINVAL;
 308
 309        /* sanity check: values below 1000 millicelcius don't make sense
 310         * and can cause the system to go into a thermal heart attack
 311         */
 312        if (state && state < 1000)
 313                return -EINVAL;
 314
 315        if (state && !tz->forced_passive) {
 316                mutex_lock(&thermal_list_lock);
 317                list_for_each_entry(cdev, &thermal_cdev_list, node) {
 318                        if (!strncmp("Processor", cdev->type,
 319                                     sizeof("Processor")))
 320                                thermal_zone_bind_cooling_device(tz,
 321                                                THERMAL_TRIPS_NONE, cdev,
 322                                                THERMAL_NO_LIMIT,
 323                                                THERMAL_NO_LIMIT);
 324                }
 325                mutex_unlock(&thermal_list_lock);
 326                if (!tz->passive_delay)
 327                        tz->passive_delay = 1000;
 328        } else if (!state && tz->forced_passive) {
 329                mutex_lock(&thermal_list_lock);
 330                list_for_each_entry(cdev, &thermal_cdev_list, node) {
 331                        if (!strncmp("Processor", cdev->type,
 332                                     sizeof("Processor")))
 333                                thermal_zone_unbind_cooling_device(tz,
 334                                                                   THERMAL_TRIPS_NONE,
 335                                                                   cdev);
 336                }
 337                mutex_unlock(&thermal_list_lock);
 338                tz->passive_delay = 0;
 339        }
 340
 341        tz->forced_passive = state;
 342
 343        thermal_zone_device_update(tz);
 344
 345        return count;
 346}
 347
 348static ssize_t
 349passive_show(struct device *dev, struct device_attribute *attr,
 350                   char *buf)
 351{
 352        struct thermal_zone_device *tz = to_thermal_zone(dev);
 353
 354        return sprintf(buf, "%d\n", tz->forced_passive);
 355}
 356
 357static DEVICE_ATTR(type, 0444, type_show, NULL);
 358static DEVICE_ATTR(temp, 0444, temp_show, NULL);
 359static DEVICE_ATTR(mode, 0644, mode_show, mode_store);
 360static DEVICE_ATTR(passive, S_IRUGO | S_IWUSR, passive_show, passive_store);
 361
 362/* sys I/F for cooling device */
 363#define to_cooling_device(_dev) \
 364        container_of(_dev, struct thermal_cooling_device, device)
 365
 366static ssize_t
 367thermal_cooling_device_type_show(struct device *dev,
 368                                 struct device_attribute *attr, char *buf)
 369{
 370        struct thermal_cooling_device *cdev = to_cooling_device(dev);
 371
 372        return sprintf(buf, "%s\n", cdev->type);
 373}
 374
 375static ssize_t
 376thermal_cooling_device_max_state_show(struct device *dev,
 377                                      struct device_attribute *attr, char *buf)
 378{
 379        struct thermal_cooling_device *cdev = to_cooling_device(dev);
 380        unsigned long state;
 381        int ret;
 382
 383        ret = cdev->ops->get_max_state(cdev, &state);
 384        if (ret)
 385                return ret;
 386        return sprintf(buf, "%ld\n", state);
 387}
 388
 389static ssize_t
 390thermal_cooling_device_cur_state_show(struct device *dev,
 391                                      struct device_attribute *attr, char *buf)
 392{
 393        struct thermal_cooling_device *cdev = to_cooling_device(dev);
 394        unsigned long state;
 395        int ret;
 396
 397        ret = cdev->ops->get_cur_state(cdev, &state);
 398        if (ret)
 399                return ret;
 400        return sprintf(buf, "%ld\n", state);
 401}
 402
 403static ssize_t
 404thermal_cooling_device_cur_state_store(struct device *dev,
 405                                       struct device_attribute *attr,
 406                                       const char *buf, size_t count)
 407{
 408        struct thermal_cooling_device *cdev = to_cooling_device(dev);
 409        unsigned long state;
 410        int result;
 411
 412        if (!sscanf(buf, "%ld\n", &state))
 413                return -EINVAL;
 414
 415        if ((long)state < 0)
 416                return -EINVAL;
 417
 418        result = cdev->ops->set_cur_state(cdev, state);
 419        if (result)
 420                return result;
 421        return count;
 422}
 423
 424static struct device_attribute dev_attr_cdev_type =
 425__ATTR(type, 0444, thermal_cooling_device_type_show, NULL);
 426static DEVICE_ATTR(max_state, 0444,
 427                   thermal_cooling_device_max_state_show, NULL);
 428static DEVICE_ATTR(cur_state, 0644,
 429                   thermal_cooling_device_cur_state_show,
 430                   thermal_cooling_device_cur_state_store);
 431
 432static ssize_t
 433thermal_cooling_device_trip_point_show(struct device *dev,
 434                                       struct device_attribute *attr, char *buf)
 435{
 436        struct thermal_instance *instance;
 437
 438        instance =
 439            container_of(attr, struct thermal_instance, attr);
 440
 441        if (instance->trip == THERMAL_TRIPS_NONE)
 442                return sprintf(buf, "-1\n");
 443        else
 444                return sprintf(buf, "%d\n", instance->trip);
 445}
 446
 447/* Device management */
 448
 449#if defined(CONFIG_THERMAL_HWMON)
 450
 451/* hwmon sys I/F */
 452#include <linux/hwmon.h>
 453
 454/* thermal zone devices with the same type share one hwmon device */
 455struct thermal_hwmon_device {
 456        char type[THERMAL_NAME_LENGTH];
 457        struct device *device;
 458        int count;
 459        struct list_head tz_list;
 460        struct list_head node;
 461};
 462
 463struct thermal_hwmon_attr {
 464        struct device_attribute attr;
 465        char name[16];
 466};
 467
 468/* one temperature input for each thermal zone */
 469struct thermal_hwmon_temp {
 470        struct list_head hwmon_node;
 471        struct thermal_zone_device *tz;
 472        struct thermal_hwmon_attr temp_input;   /* hwmon sys attr */
 473        struct thermal_hwmon_attr temp_crit;    /* hwmon sys attr */
 474};
 475
 476static LIST_HEAD(thermal_hwmon_list);
 477
 478static ssize_t
 479name_show(struct device *dev, struct device_attribute *attr, char *buf)
 480{
 481        struct thermal_hwmon_device *hwmon = dev_get_drvdata(dev);
 482        return sprintf(buf, "%s\n", hwmon->type);
 483}
 484static DEVICE_ATTR(name, 0444, name_show, NULL);
 485
 486static ssize_t
 487temp_input_show(struct device *dev, struct device_attribute *attr, char *buf)
 488{
 489        long temperature;
 490        int ret;
 491        struct thermal_hwmon_attr *hwmon_attr
 492                        = container_of(attr, struct thermal_hwmon_attr, attr);
 493        struct thermal_hwmon_temp *temp
 494                        = container_of(hwmon_attr, struct thermal_hwmon_temp,
 495                                       temp_input);
 496        struct thermal_zone_device *tz = temp->tz;
 497
 498        ret = tz->ops->get_temp(tz, &temperature);
 499
 500        if (ret)
 501                return ret;
 502
 503        return sprintf(buf, "%ld\n", temperature);
 504}
 505
 506static ssize_t
 507temp_crit_show(struct device *dev, struct device_attribute *attr,
 508                char *buf)
 509{
 510        struct thermal_hwmon_attr *hwmon_attr
 511                        = container_of(attr, struct thermal_hwmon_attr, attr);
 512        struct thermal_hwmon_temp *temp
 513                        = container_of(hwmon_attr, struct thermal_hwmon_temp,
 514                                       temp_crit);
 515        struct thermal_zone_device *tz = temp->tz;
 516        long temperature;
 517        int ret;
 518
 519        ret = tz->ops->get_trip_temp(tz, 0, &temperature);
 520        if (ret)
 521                return ret;
 522
 523        return sprintf(buf, "%ld\n", temperature);
 524}
 525
 526
 527static struct thermal_hwmon_device *
 528thermal_hwmon_lookup_by_type(const struct thermal_zone_device *tz)
 529{
 530        struct thermal_hwmon_device *hwmon;
 531
 532        mutex_lock(&thermal_list_lock);
 533        list_for_each_entry(hwmon, &thermal_hwmon_list, node)
 534                if (!strcmp(hwmon->type, tz->type)) {
 535                        mutex_unlock(&thermal_list_lock);
 536                        return hwmon;
 537                }
 538        mutex_unlock(&thermal_list_lock);
 539
 540        return NULL;
 541}
 542
 543/* Find the temperature input matching a given thermal zone */
 544static struct thermal_hwmon_temp *
 545thermal_hwmon_lookup_temp(const struct thermal_hwmon_device *hwmon,
 546                          const struct thermal_zone_device *tz)
 547{
 548        struct thermal_hwmon_temp *temp;
 549
 550        mutex_lock(&thermal_list_lock);
 551        list_for_each_entry(temp, &hwmon->tz_list, hwmon_node)
 552                if (temp->tz == tz) {
 553                        mutex_unlock(&thermal_list_lock);
 554                        return temp;
 555                }
 556        mutex_unlock(&thermal_list_lock);
 557
 558        return NULL;
 559}
 560
 561static int
 562thermal_add_hwmon_sysfs(struct thermal_zone_device *tz)
 563{
 564        struct thermal_hwmon_device *hwmon;
 565        struct thermal_hwmon_temp *temp;
 566        int new_hwmon_device = 1;
 567        int result;
 568
 569        hwmon = thermal_hwmon_lookup_by_type(tz);
 570        if (hwmon) {
 571                new_hwmon_device = 0;
 572                goto register_sys_interface;
 573        }
 574
 575        hwmon = kzalloc(sizeof(struct thermal_hwmon_device), GFP_KERNEL);
 576        if (!hwmon)
 577                return -ENOMEM;
 578
 579        INIT_LIST_HEAD(&hwmon->tz_list);
 580        strlcpy(hwmon->type, tz->type, THERMAL_NAME_LENGTH);
 581        hwmon->device = hwmon_device_register(NULL);
 582        if (IS_ERR(hwmon->device)) {
 583                result = PTR_ERR(hwmon->device);
 584                goto free_mem;
 585        }
 586        dev_set_drvdata(hwmon->device, hwmon);
 587        result = device_create_file(hwmon->device, &dev_attr_name);
 588        if (result)
 589                goto free_mem;
 590
 591 register_sys_interface:
 592        temp = kzalloc(sizeof(struct thermal_hwmon_temp), GFP_KERNEL);
 593        if (!temp) {
 594                result = -ENOMEM;
 595                goto unregister_name;
 596        }
 597
 598        temp->tz = tz;
 599        hwmon->count++;
 600
 601        snprintf(temp->temp_input.name, sizeof(temp->temp_input.name),
 602                 "temp%d_input", hwmon->count);
 603        temp->temp_input.attr.attr.name = temp->temp_input.name;
 604        temp->temp_input.attr.attr.mode = 0444;
 605        temp->temp_input.attr.show = temp_input_show;
 606        sysfs_attr_init(&temp->temp_input.attr.attr);
 607        result = device_create_file(hwmon->device, &temp->temp_input.attr);
 608        if (result)
 609                goto free_temp_mem;
 610
 611        if (tz->ops->get_crit_temp) {
 612                unsigned long temperature;
 613                if (!tz->ops->get_crit_temp(tz, &temperature)) {
 614                        snprintf(temp->temp_crit.name,
 615                                 sizeof(temp->temp_crit.name),
 616                                "temp%d_crit", hwmon->count);
 617                        temp->temp_crit.attr.attr.name = temp->temp_crit.name;
 618                        temp->temp_crit.attr.attr.mode = 0444;
 619                        temp->temp_crit.attr.show = temp_crit_show;
 620                        sysfs_attr_init(&temp->temp_crit.attr.attr);
 621                        result = device_create_file(hwmon->device,
 622                                                    &temp->temp_crit.attr);
 623                        if (result)
 624                                goto unregister_input;
 625                }
 626        }
 627
 628        mutex_lock(&thermal_list_lock);
 629        if (new_hwmon_device)
 630                list_add_tail(&hwmon->node, &thermal_hwmon_list);
 631        list_add_tail(&temp->hwmon_node, &hwmon->tz_list);
 632        mutex_unlock(&thermal_list_lock);
 633
 634        return 0;
 635
 636 unregister_input:
 637        device_remove_file(hwmon->device, &temp->temp_input.attr);
 638 free_temp_mem:
 639        kfree(temp);
 640 unregister_name:
 641        if (new_hwmon_device) {
 642                device_remove_file(hwmon->device, &dev_attr_name);
 643                hwmon_device_unregister(hwmon->device);
 644        }
 645 free_mem:
 646        if (new_hwmon_device)
 647                kfree(hwmon);
 648
 649        return result;
 650}
 651
 652static void
 653thermal_remove_hwmon_sysfs(struct thermal_zone_device *tz)
 654{
 655        struct thermal_hwmon_device *hwmon;
 656        struct thermal_hwmon_temp *temp;
 657
 658        hwmon = thermal_hwmon_lookup_by_type(tz);
 659        if (unlikely(!hwmon)) {
 660                /* Should never happen... */
 661                dev_dbg(&tz->device, "hwmon device lookup failed!\n");
 662                return;
 663        }
 664
 665        temp = thermal_hwmon_lookup_temp(hwmon, tz);
 666        if (unlikely(!temp)) {
 667                /* Should never happen... */
 668                dev_dbg(&tz->device, "temperature input lookup failed!\n");
 669                return;
 670        }
 671
 672        device_remove_file(hwmon->device, &temp->temp_input.attr);
 673        if (tz->ops->get_crit_temp)
 674                device_remove_file(hwmon->device, &temp->temp_crit.attr);
 675
 676        mutex_lock(&thermal_list_lock);
 677        list_del(&temp->hwmon_node);
 678        kfree(temp);
 679        if (!list_empty(&hwmon->tz_list)) {
 680                mutex_unlock(&thermal_list_lock);
 681                return;
 682        }
 683        list_del(&hwmon->node);
 684        mutex_unlock(&thermal_list_lock);
 685
 686        device_remove_file(hwmon->device, &dev_attr_name);
 687        hwmon_device_unregister(hwmon->device);
 688        kfree(hwmon);
 689}
 690#else
 691static int
 692thermal_add_hwmon_sysfs(struct thermal_zone_device *tz)
 693{
 694        return 0;
 695}
 696
 697static void
 698thermal_remove_hwmon_sysfs(struct thermal_zone_device *tz)
 699{
 700}
 701#endif
 702
 703static void thermal_zone_device_set_polling(struct thermal_zone_device *tz,
 704                                            int delay)
 705{
 706        if (delay > 1000)
 707                mod_delayed_work(system_freezable_wq, &tz->poll_queue,
 708                                 round_jiffies(msecs_to_jiffies(delay)));
 709        else if (delay)
 710                mod_delayed_work(system_freezable_wq, &tz->poll_queue,
 711                                 msecs_to_jiffies(delay));
 712        else
 713                cancel_delayed_work(&tz->poll_queue);
 714}
 715
 716static void thermal_zone_device_check(struct work_struct *work)
 717{
 718        struct thermal_zone_device *tz = container_of(work, struct
 719                                                      thermal_zone_device,
 720                                                      poll_queue.work);
 721        thermal_zone_device_update(tz);
 722}
 723
 724/**
 725 * thermal_zone_bind_cooling_device - bind a cooling device to a thermal zone
 726 * @tz:         thermal zone device
 727 * @trip:       indicates which trip point the cooling devices is
 728 *              associated with in this thermal zone.
 729 * @cdev:       thermal cooling device
 730 *
 731 * This function is usually called in the thermal zone device .bind callback.
 732 */
 733int thermal_zone_bind_cooling_device(struct thermal_zone_device *tz,
 734                                     int trip,
 735                                     struct thermal_cooling_device *cdev,
 736                                     unsigned long upper, unsigned long lower)
 737{
 738        struct thermal_instance *dev;
 739        struct thermal_instance *pos;
 740        struct thermal_zone_device *pos1;
 741        struct thermal_cooling_device *pos2;
 742        unsigned long max_state;
 743        int result;
 744
 745        if (trip >= tz->trips || (trip < 0 && trip != THERMAL_TRIPS_NONE))
 746                return -EINVAL;
 747
 748        list_for_each_entry(pos1, &thermal_tz_list, node) {
 749                if (pos1 == tz)
 750                        break;
 751        }
 752        list_for_each_entry(pos2, &thermal_cdev_list, node) {
 753                if (pos2 == cdev)
 754                        break;
 755        }
 756
 757        if (tz != pos1 || cdev != pos2)
 758                return -EINVAL;
 759
 760        cdev->ops->get_max_state(cdev, &max_state);
 761
 762        /* lower default 0, upper default max_state */
 763        lower = lower == THERMAL_NO_LIMIT ? 0 : lower;
 764        upper = upper == THERMAL_NO_LIMIT ? max_state : upper;
 765
 766        if (lower > upper || upper > max_state)
 767                return -EINVAL;
 768
 769        dev =
 770            kzalloc(sizeof(struct thermal_instance), GFP_KERNEL);
 771        if (!dev)
 772                return -ENOMEM;
 773        dev->tz = tz;
 774        dev->cdev = cdev;
 775        dev->trip = trip;
 776        dev->upper = upper;
 777        dev->lower = lower;
 778        dev->target = THERMAL_NO_TARGET;
 779
 780        result = get_idr(&tz->idr, &tz->lock, &dev->id);
 781        if (result)
 782                goto free_mem;
 783
 784        sprintf(dev->name, "cdev%d", dev->id);
 785        result =
 786            sysfs_create_link(&tz->device.kobj, &cdev->device.kobj, dev->name);
 787        if (result)
 788                goto release_idr;
 789
 790        sprintf(dev->attr_name, "cdev%d_trip_point", dev->id);
 791        sysfs_attr_init(&dev->attr.attr);
 792        dev->attr.attr.name = dev->attr_name;
 793        dev->attr.attr.mode = 0444;
 794        dev->attr.show = thermal_cooling_device_trip_point_show;
 795        result = device_create_file(&tz->device, &dev->attr);
 796        if (result)
 797                goto remove_symbol_link;
 798
 799        mutex_lock(&tz->lock);
 800        mutex_lock(&cdev->lock);
 801        list_for_each_entry(pos, &tz->thermal_instances, tz_node)
 802            if (pos->tz == tz && pos->trip == trip && pos->cdev == cdev) {
 803                result = -EEXIST;
 804                break;
 805        }
 806        if (!result) {
 807                list_add_tail(&dev->tz_node, &tz->thermal_instances);
 808                list_add_tail(&dev->cdev_node, &cdev->thermal_instances);
 809        }
 810        mutex_unlock(&cdev->lock);
 811        mutex_unlock(&tz->lock);
 812
 813        if (!result)
 814                return 0;
 815
 816        device_remove_file(&tz->device, &dev->attr);
 817remove_symbol_link:
 818        sysfs_remove_link(&tz->device.kobj, dev->name);
 819release_idr:
 820        release_idr(&tz->idr, &tz->lock, dev->id);
 821free_mem:
 822        kfree(dev);
 823        return result;
 824}
 825EXPORT_SYMBOL(thermal_zone_bind_cooling_device);
 826
 827/**
 828 * thermal_zone_unbind_cooling_device - unbind a cooling device from a thermal zone
 829 * @tz:         thermal zone device
 830 * @trip:       indicates which trip point the cooling devices is
 831 *              associated with in this thermal zone.
 832 * @cdev:       thermal cooling device
 833 *
 834 * This function is usually called in the thermal zone device .unbind callback.
 835 */
 836int thermal_zone_unbind_cooling_device(struct thermal_zone_device *tz,
 837                                       int trip,
 838                                       struct thermal_cooling_device *cdev)
 839{
 840        struct thermal_instance *pos, *next;
 841
 842        mutex_lock(&tz->lock);
 843        mutex_lock(&cdev->lock);
 844        list_for_each_entry_safe(pos, next, &tz->thermal_instances, tz_node) {
 845                if (pos->tz == tz && pos->trip == trip && pos->cdev == cdev) {
 846                        list_del(&pos->tz_node);
 847                        list_del(&pos->cdev_node);
 848                        mutex_unlock(&cdev->lock);
 849                        mutex_unlock(&tz->lock);
 850                        goto unbind;
 851                }
 852        }
 853        mutex_unlock(&cdev->lock);
 854        mutex_unlock(&tz->lock);
 855
 856        return -ENODEV;
 857
 858unbind:
 859        device_remove_file(&tz->device, &pos->attr);
 860        sysfs_remove_link(&tz->device.kobj, pos->name);
 861        release_idr(&tz->idr, &tz->lock, pos->id);
 862        kfree(pos);
 863        return 0;
 864}
 865EXPORT_SYMBOL(thermal_zone_unbind_cooling_device);
 866
 867static void thermal_release(struct device *dev)
 868{
 869        struct thermal_zone_device *tz;
 870        struct thermal_cooling_device *cdev;
 871
 872        if (!strncmp(dev_name(dev), "thermal_zone",
 873                     sizeof("thermal_zone") - 1)) {
 874                tz = to_thermal_zone(dev);
 875                kfree(tz);
 876        } else {
 877                cdev = to_cooling_device(dev);
 878                kfree(cdev);
 879        }
 880}
 881
 882static struct class thermal_class = {
 883        .name = "thermal",
 884        .dev_release = thermal_release,
 885};
 886
 887/**
 888 * thermal_cooling_device_register - register a new thermal cooling device
 889 * @type:       the thermal cooling device type.
 890 * @devdata:    device private data.
 891 * @ops:                standard thermal cooling devices callbacks.
 892 */
 893struct thermal_cooling_device *
 894thermal_cooling_device_register(char *type, void *devdata,
 895                                const struct thermal_cooling_device_ops *ops)
 896{
 897        struct thermal_cooling_device *cdev;
 898        struct thermal_zone_device *pos;
 899        int result;
 900
 901        if (type && strlen(type) >= THERMAL_NAME_LENGTH)
 902                return ERR_PTR(-EINVAL);
 903
 904        if (!ops || !ops->get_max_state || !ops->get_cur_state ||
 905            !ops->set_cur_state)
 906                return ERR_PTR(-EINVAL);
 907
 908        cdev = kzalloc(sizeof(struct thermal_cooling_device), GFP_KERNEL);
 909        if (!cdev)
 910                return ERR_PTR(-ENOMEM);
 911
 912        result = get_idr(&thermal_cdev_idr, &thermal_idr_lock, &cdev->id);
 913        if (result) {
 914                kfree(cdev);
 915                return ERR_PTR(result);
 916        }
 917
 918        strcpy(cdev->type, type ? : "");
 919        mutex_init(&cdev->lock);
 920        INIT_LIST_HEAD(&cdev->thermal_instances);
 921        cdev->ops = ops;
 922        cdev->updated = true;
 923        cdev->device.class = &thermal_class;
 924        cdev->devdata = devdata;
 925        dev_set_name(&cdev->device, "cooling_device%d", cdev->id);
 926        result = device_register(&cdev->device);
 927        if (result) {
 928                release_idr(&thermal_cdev_idr, &thermal_idr_lock, cdev->id);
 929                kfree(cdev);
 930                return ERR_PTR(result);
 931        }
 932
 933        /* sys I/F */
 934        if (type) {
 935                result = device_create_file(&cdev->device, &dev_attr_cdev_type);
 936                if (result)
 937                        goto unregister;
 938        }
 939
 940        result = device_create_file(&cdev->device, &dev_attr_max_state);
 941        if (result)
 942                goto unregister;
 943
 944        result = device_create_file(&cdev->device, &dev_attr_cur_state);
 945        if (result)
 946                goto unregister;
 947
 948        mutex_lock(&thermal_list_lock);
 949        list_add(&cdev->node, &thermal_cdev_list);
 950        list_for_each_entry(pos, &thermal_tz_list, node) {
 951                if (!pos->ops->bind)
 952                        continue;
 953                result = pos->ops->bind(pos, cdev);
 954                if (result)
 955                        break;
 956
 957        }
 958        mutex_unlock(&thermal_list_lock);
 959
 960        if (!result)
 961                return cdev;
 962
 963unregister:
 964        release_idr(&thermal_cdev_idr, &thermal_idr_lock, cdev->id);
 965        device_unregister(&cdev->device);
 966        return ERR_PTR(result);
 967}
 968EXPORT_SYMBOL(thermal_cooling_device_register);
 969
 970/**
 971 * thermal_cooling_device_unregister - removes the registered thermal cooling device
 972 * @cdev:       the thermal cooling device to remove.
 973 *
 974 * thermal_cooling_device_unregister() must be called when the device is no
 975 * longer needed.
 976 */
 977void thermal_cooling_device_unregister(struct
 978                                       thermal_cooling_device
 979                                       *cdev)
 980{
 981        struct thermal_zone_device *tz;
 982        struct thermal_cooling_device *pos = NULL;
 983
 984        if (!cdev)
 985                return;
 986
 987        mutex_lock(&thermal_list_lock);
 988        list_for_each_entry(pos, &thermal_cdev_list, node)
 989            if (pos == cdev)
 990                break;
 991        if (pos != cdev) {
 992                /* thermal cooling device not found */
 993                mutex_unlock(&thermal_list_lock);
 994                return;
 995        }
 996        list_del(&cdev->node);
 997        list_for_each_entry(tz, &thermal_tz_list, node) {
 998                if (!tz->ops->unbind)
 999                        continue;
1000                tz->ops->unbind(tz, cdev);
1001        }
1002        mutex_unlock(&thermal_list_lock);
1003        if (cdev->type[0])
1004                device_remove_file(&cdev->device, &dev_attr_cdev_type);
1005        device_remove_file(&cdev->device, &dev_attr_max_state);
1006        device_remove_file(&cdev->device, &dev_attr_cur_state);
1007
1008        release_idr(&thermal_cdev_idr, &thermal_idr_lock, cdev->id);
1009        device_unregister(&cdev->device);
1010        return;
1011}
1012EXPORT_SYMBOL(thermal_cooling_device_unregister);
1013
1014static void thermal_cdev_do_update(struct thermal_cooling_device *cdev)
1015{
1016        struct thermal_instance *instance;
1017        unsigned long target = 0;
1018
1019        /* cooling device is updated*/
1020        if (cdev->updated)
1021                return;
1022
1023        mutex_lock(&cdev->lock);
1024        /* Make sure cdev enters the deepest cooling state */
1025        list_for_each_entry(instance, &cdev->thermal_instances, cdev_node) {
1026                if (instance->target == THERMAL_NO_TARGET)
1027                        continue;
1028                if (instance->target > target)
1029                        target = instance->target;
1030        }
1031        mutex_unlock(&cdev->lock);
1032        cdev->ops->set_cur_state(cdev, target);
1033        cdev->updated = true;
1034}
1035
1036static void thermal_zone_do_update(struct thermal_zone_device *tz)
1037{
1038        struct thermal_instance *instance;
1039
1040        list_for_each_entry(instance, &tz->thermal_instances, tz_node)
1041                thermal_cdev_do_update(instance->cdev);
1042}
1043
1044/*
1045 * Cooling algorithm for both active and passive cooling
1046 *
1047 * 1. if the temperature is higher than a trip point,
1048 *    a. if the trend is THERMAL_TREND_RAISING, use higher cooling
1049 *       state for this trip point
1050 *    b. if the trend is THERMAL_TREND_DROPPING, use lower cooling
1051 *       state for this trip point
1052 *
1053 * 2. if the temperature is lower than a trip point, use lower
1054 *    cooling state for this trip point
1055 *
1056 * Note that this behaves the same as the previous passive cooling
1057 * algorithm.
1058 */
1059
1060static void thermal_zone_trip_update(struct thermal_zone_device *tz,
1061                                     int trip, long temp)
1062{
1063        struct thermal_instance *instance;
1064        struct thermal_cooling_device *cdev = NULL;
1065        unsigned long cur_state, max_state;
1066        long trip_temp;
1067        enum thermal_trip_type trip_type;
1068        enum thermal_trend trend;
1069
1070        if (trip == THERMAL_TRIPS_NONE) {
1071                trip_temp = tz->forced_passive;
1072                trip_type = THERMAL_TRIPS_NONE;
1073        } else {
1074                tz->ops->get_trip_temp(tz, trip, &trip_temp);
1075                tz->ops->get_trip_type(tz, trip, &trip_type);
1076        }
1077
1078        if (!tz->ops->get_trend || tz->ops->get_trend(tz, trip, &trend)) {
1079                /*
1080                 * compare the current temperature and previous temperature
1081                 * to get the thermal trend, if no special requirement
1082                 */
1083                if (tz->temperature > tz->last_temperature)
1084                        trend = THERMAL_TREND_RAISING;
1085                else if (tz->temperature < tz->last_temperature)
1086                        trend = THERMAL_TREND_DROPPING;
1087                else
1088                        trend = THERMAL_TREND_STABLE;
1089        }
1090
1091        if (temp >= trip_temp) {
1092                list_for_each_entry(instance, &tz->thermal_instances, tz_node) {
1093                        if (instance->trip != trip)
1094                                continue;
1095
1096                        cdev = instance->cdev;
1097
1098                        cdev->ops->get_cur_state(cdev, &cur_state);
1099                        cdev->ops->get_max_state(cdev, &max_state);
1100
1101                        if (trend == THERMAL_TREND_RAISING) {
1102                                cur_state = cur_state < instance->upper ?
1103                                            (cur_state + 1) : instance->upper;
1104                        } else if (trend == THERMAL_TREND_DROPPING) {
1105                                cur_state = cur_state > instance->lower ?
1106                                    (cur_state - 1) : instance->lower;
1107                        }
1108
1109                        /* activate a passive thermal instance */
1110                        if ((trip_type == THERMAL_TRIP_PASSIVE ||
1111                             trip_type == THERMAL_TRIPS_NONE) &&
1112                             instance->target == THERMAL_NO_TARGET)
1113                                tz->passive++;
1114
1115                        instance->target = cur_state;
1116                        cdev->updated = false; /* cooling device needs update */
1117                }
1118        } else {        /* below trip */
1119                list_for_each_entry(instance, &tz->thermal_instances, tz_node) {
1120                        if (instance->trip != trip)
1121                                continue;
1122
1123                        /* Do not use the inactive thermal instance */
1124                        if (instance->target == THERMAL_NO_TARGET)
1125                                continue;
1126                        cdev = instance->cdev;
1127                        cdev->ops->get_cur_state(cdev, &cur_state);
1128
1129                        cur_state = cur_state > instance->lower ?
1130                                    (cur_state - 1) : THERMAL_NO_TARGET;
1131
1132                        /* deactivate a passive thermal instance */
1133                        if ((trip_type == THERMAL_TRIP_PASSIVE ||
1134                             trip_type == THERMAL_TRIPS_NONE) &&
1135                             cur_state == THERMAL_NO_TARGET)
1136                                tz->passive--;
1137                        instance->target = cur_state;
1138                        cdev->updated = false; /* cooling device needs update */
1139                }
1140        }
1141
1142        return;
1143}
1144/**
1145 * thermal_zone_device_update - force an update of a thermal zone's state
1146 * @ttz:        the thermal zone to update
1147 */
1148
1149void thermal_zone_device_update(struct thermal_zone_device *tz)
1150{
1151        int count, ret = 0;
1152        long temp, trip_temp;
1153        enum thermal_trip_type trip_type;
1154
1155        mutex_lock(&tz->lock);
1156
1157        if (tz->ops->get_temp(tz, &temp)) {
1158                /* get_temp failed - retry it later */
1159                pr_warn("failed to read out thermal zone %d\n", tz->id);
1160                goto leave;
1161        }
1162
1163        tz->last_temperature = tz->temperature;
1164        tz->temperature = temp;
1165
1166        for (count = 0; count < tz->trips; count++) {
1167                tz->ops->get_trip_type(tz, count, &trip_type);
1168                tz->ops->get_trip_temp(tz, count, &trip_temp);
1169
1170                switch (trip_type) {
1171                case THERMAL_TRIP_CRITICAL:
1172                        if (temp >= trip_temp) {
1173                                if (tz->ops->notify)
1174                                        ret = tz->ops->notify(tz, count,
1175                                                              trip_type);
1176                                if (!ret) {
1177                                        pr_emerg("Critical temperature reached (%ld C), shutting down\n",
1178                                                 temp/1000);
1179                                        orderly_poweroff(true);
1180                                }
1181                        }
1182                        break;
1183                case THERMAL_TRIP_HOT:
1184                        if (temp >= trip_temp)
1185                                if (tz->ops->notify)
1186                                        tz->ops->notify(tz, count, trip_type);
1187                        break;
1188                case THERMAL_TRIP_ACTIVE:
1189                        thermal_zone_trip_update(tz, count, temp);
1190                        break;
1191                case THERMAL_TRIP_PASSIVE:
1192                        if (temp >= trip_temp || tz->passive)
1193                                thermal_zone_trip_update(tz, count, temp);
1194                        break;
1195                }
1196        }
1197
1198        if (tz->forced_passive)
1199                thermal_zone_trip_update(tz, THERMAL_TRIPS_NONE, temp);
1200        thermal_zone_do_update(tz);
1201
1202leave:
1203        if (tz->passive)
1204                thermal_zone_device_set_polling(tz, tz->passive_delay);
1205        else if (tz->polling_delay)
1206                thermal_zone_device_set_polling(tz, tz->polling_delay);
1207        else
1208                thermal_zone_device_set_polling(tz, 0);
1209        mutex_unlock(&tz->lock);
1210}
1211EXPORT_SYMBOL(thermal_zone_device_update);
1212
1213/**
1214 * create_trip_attrs - create attributes for trip points
1215 * @tz:         the thermal zone device
1216 * @mask:       Writeable trip point bitmap.
1217 */
1218static int create_trip_attrs(struct thermal_zone_device *tz, int mask)
1219{
1220        int indx;
1221        int size = sizeof(struct thermal_attr) * tz->trips;
1222
1223        tz->trip_type_attrs = kzalloc(size, GFP_KERNEL);
1224        if (!tz->trip_type_attrs)
1225                return -ENOMEM;
1226
1227        tz->trip_temp_attrs = kzalloc(size, GFP_KERNEL);
1228        if (!tz->trip_temp_attrs) {
1229                kfree(tz->trip_type_attrs);
1230                return -ENOMEM;
1231        }
1232
1233        if (tz->ops->get_trip_hyst) {
1234                tz->trip_hyst_attrs = kzalloc(size, GFP_KERNEL);
1235                if (!tz->trip_hyst_attrs) {
1236                        kfree(tz->trip_type_attrs);
1237                        kfree(tz->trip_temp_attrs);
1238                        return -ENOMEM;
1239                }
1240        }
1241
1242
1243        for (indx = 0; indx < tz->trips; indx++) {
1244                /* create trip type attribute */
1245                snprintf(tz->trip_type_attrs[indx].name, THERMAL_NAME_LENGTH,
1246                         "trip_point_%d_type", indx);
1247
1248                sysfs_attr_init(&tz->trip_type_attrs[indx].attr.attr);
1249                tz->trip_type_attrs[indx].attr.attr.name =
1250                                                tz->trip_type_attrs[indx].name;
1251                tz->trip_type_attrs[indx].attr.attr.mode = S_IRUGO;
1252                tz->trip_type_attrs[indx].attr.show = trip_point_type_show;
1253
1254                device_create_file(&tz->device,
1255                                   &tz->trip_type_attrs[indx].attr);
1256
1257                /* create trip temp attribute */
1258                snprintf(tz->trip_temp_attrs[indx].name, THERMAL_NAME_LENGTH,
1259                         "trip_point_%d_temp", indx);
1260
1261                sysfs_attr_init(&tz->trip_temp_attrs[indx].attr.attr);
1262                tz->trip_temp_attrs[indx].attr.attr.name =
1263                                                tz->trip_temp_attrs[indx].name;
1264                tz->trip_temp_attrs[indx].attr.attr.mode = S_IRUGO;
1265                tz->trip_temp_attrs[indx].attr.show = trip_point_temp_show;
1266                if (mask & (1 << indx)) {
1267                        tz->trip_temp_attrs[indx].attr.attr.mode |= S_IWUSR;
1268                        tz->trip_temp_attrs[indx].attr.store =
1269                                                        trip_point_temp_store;
1270                }
1271
1272                device_create_file(&tz->device,
1273                                   &tz->trip_temp_attrs[indx].attr);
1274
1275                /* create Optional trip hyst attribute */
1276                if (!tz->ops->get_trip_hyst)
1277                        continue;
1278                snprintf(tz->trip_hyst_attrs[indx].name, THERMAL_NAME_LENGTH,
1279                         "trip_point_%d_hyst", indx);
1280
1281                sysfs_attr_init(&tz->trip_hyst_attrs[indx].attr.attr);
1282                tz->trip_hyst_attrs[indx].attr.attr.name =
1283                                        tz->trip_hyst_attrs[indx].name;
1284                tz->trip_hyst_attrs[indx].attr.attr.mode = S_IRUGO;
1285                tz->trip_hyst_attrs[indx].attr.show = trip_point_hyst_show;
1286                if (tz->ops->set_trip_hyst) {
1287                        tz->trip_hyst_attrs[indx].attr.attr.mode |= S_IWUSR;
1288                        tz->trip_hyst_attrs[indx].attr.store =
1289                                        trip_point_hyst_store;
1290                }
1291
1292                device_create_file(&tz->device,
1293                                   &tz->trip_hyst_attrs[indx].attr);
1294        }
1295        return 0;
1296}
1297
1298static void remove_trip_attrs(struct thermal_zone_device *tz)
1299{
1300        int indx;
1301
1302        for (indx = 0; indx < tz->trips; indx++) {
1303                device_remove_file(&tz->device,
1304                                   &tz->trip_type_attrs[indx].attr);
1305                device_remove_file(&tz->device,
1306                                   &tz->trip_temp_attrs[indx].attr);
1307                if (tz->ops->get_trip_hyst)
1308                        device_remove_file(&tz->device,
1309                                  &tz->trip_hyst_attrs[indx].attr);
1310        }
1311        kfree(tz->trip_type_attrs);
1312        kfree(tz->trip_temp_attrs);
1313        kfree(tz->trip_hyst_attrs);
1314}
1315
1316/**
1317 * thermal_zone_device_register - register a new thermal zone device
1318 * @type:       the thermal zone device type
1319 * @trips:      the number of trip points the thermal zone support
1320 * @mask:       a bit string indicating the writeablility of trip points
1321 * @devdata:    private device data
1322 * @ops:        standard thermal zone device callbacks
1323 * @passive_delay: number of milliseconds to wait between polls when
1324 *                 performing passive cooling
1325 * @polling_delay: number of milliseconds to wait between polls when checking
1326 *                 whether trip points have been crossed (0 for interrupt
1327 *                 driven systems)
1328 *
1329 * thermal_zone_device_unregister() must be called when the device is no
1330 * longer needed. The passive cooling depends on the .get_trend() return value.
1331 */
1332struct thermal_zone_device *thermal_zone_device_register(const char *type,
1333        int trips, int mask, void *devdata,
1334        const struct thermal_zone_device_ops *ops,
1335        int passive_delay, int polling_delay)
1336{
1337        struct thermal_zone_device *tz;
1338        struct thermal_cooling_device *pos;
1339        enum thermal_trip_type trip_type;
1340        int result;
1341        int count;
1342        int passive = 0;
1343
1344        if (type && strlen(type) >= THERMAL_NAME_LENGTH)
1345                return ERR_PTR(-EINVAL);
1346
1347        if (trips > THERMAL_MAX_TRIPS || trips < 0 || mask >> trips)
1348                return ERR_PTR(-EINVAL);
1349
1350        if (!ops || !ops->get_temp)
1351                return ERR_PTR(-EINVAL);
1352
1353        tz = kzalloc(sizeof(struct thermal_zone_device), GFP_KERNEL);
1354        if (!tz)
1355                return ERR_PTR(-ENOMEM);
1356
1357        INIT_LIST_HEAD(&tz->thermal_instances);
1358        idr_init(&tz->idr);
1359        mutex_init(&tz->lock);
1360        result = get_idr(&thermal_tz_idr, &thermal_idr_lock, &tz->id);
1361        if (result) {
1362                kfree(tz);
1363                return ERR_PTR(result);
1364        }
1365
1366        strcpy(tz->type, type ? : "");
1367        tz->ops = ops;
1368        tz->device.class = &thermal_class;
1369        tz->devdata = devdata;
1370        tz->trips = trips;
1371        tz->passive_delay = passive_delay;
1372        tz->polling_delay = polling_delay;
1373
1374        dev_set_name(&tz->device, "thermal_zone%d", tz->id);
1375        result = device_register(&tz->device);
1376        if (result) {
1377                release_idr(&thermal_tz_idr, &thermal_idr_lock, tz->id);
1378                kfree(tz);
1379                return ERR_PTR(result);
1380        }
1381
1382        /* sys I/F */
1383        if (type) {
1384                result = device_create_file(&tz->device, &dev_attr_type);
1385                if (result)
1386                        goto unregister;
1387        }
1388
1389        result = device_create_file(&tz->device, &dev_attr_temp);
1390        if (result)
1391                goto unregister;
1392
1393        if (ops->get_mode) {
1394                result = device_create_file(&tz->device, &dev_attr_mode);
1395                if (result)
1396                        goto unregister;
1397        }
1398
1399        result = create_trip_attrs(tz, mask);
1400        if (result)
1401                goto unregister;
1402
1403        for (count = 0; count < trips; count++) {
1404                tz->ops->get_trip_type(tz, count, &trip_type);
1405                if (trip_type == THERMAL_TRIP_PASSIVE)
1406                        passive = 1;
1407        }
1408
1409        if (!passive)
1410                result = device_create_file(&tz->device,
1411                                            &dev_attr_passive);
1412
1413        if (result)
1414                goto unregister;
1415
1416        result = thermal_add_hwmon_sysfs(tz);
1417        if (result)
1418                goto unregister;
1419
1420        mutex_lock(&thermal_list_lock);
1421        list_add_tail(&tz->node, &thermal_tz_list);
1422        if (ops->bind)
1423                list_for_each_entry(pos, &thermal_cdev_list, node) {
1424                result = ops->bind(tz, pos);
1425                if (result)
1426                        break;
1427                }
1428        mutex_unlock(&thermal_list_lock);
1429
1430        INIT_DELAYED_WORK(&(tz->poll_queue), thermal_zone_device_check);
1431
1432        thermal_zone_device_update(tz);
1433
1434        if (!result)
1435                return tz;
1436
1437unregister:
1438        release_idr(&thermal_tz_idr, &thermal_idr_lock, tz->id);
1439        device_unregister(&tz->device);
1440        return ERR_PTR(result);
1441}
1442EXPORT_SYMBOL(thermal_zone_device_register);
1443
1444/**
1445 * thermal_device_unregister - removes the registered thermal zone device
1446 * @tz: the thermal zone device to remove
1447 */
1448void thermal_zone_device_unregister(struct thermal_zone_device *tz)
1449{
1450        struct thermal_cooling_device *cdev;
1451        struct thermal_zone_device *pos = NULL;
1452
1453        if (!tz)
1454                return;
1455
1456        mutex_lock(&thermal_list_lock);
1457        list_for_each_entry(pos, &thermal_tz_list, node)
1458            if (pos == tz)
1459                break;
1460        if (pos != tz) {
1461                /* thermal zone device not found */
1462                mutex_unlock(&thermal_list_lock);
1463                return;
1464        }
1465        list_del(&tz->node);
1466        if (tz->ops->unbind)
1467                list_for_each_entry(cdev, &thermal_cdev_list, node)
1468                    tz->ops->unbind(tz, cdev);
1469        mutex_unlock(&thermal_list_lock);
1470
1471        thermal_zone_device_set_polling(tz, 0);
1472
1473        if (tz->type[0])
1474                device_remove_file(&tz->device, &dev_attr_type);
1475        device_remove_file(&tz->device, &dev_attr_temp);
1476        if (tz->ops->get_mode)
1477                device_remove_file(&tz->device, &dev_attr_mode);
1478        remove_trip_attrs(tz);
1479
1480        thermal_remove_hwmon_sysfs(tz);
1481        release_idr(&thermal_tz_idr, &thermal_idr_lock, tz->id);
1482        idr_destroy(&tz->idr);
1483        mutex_destroy(&tz->lock);
1484        device_unregister(&tz->device);
1485        return;
1486}
1487EXPORT_SYMBOL(thermal_zone_device_unregister);
1488
1489#ifdef CONFIG_NET
1490static struct genl_family thermal_event_genl_family = {
1491        .id = GENL_ID_GENERATE,
1492        .name = THERMAL_GENL_FAMILY_NAME,
1493        .version = THERMAL_GENL_VERSION,
1494        .maxattr = THERMAL_GENL_ATTR_MAX,
1495};
1496
1497static struct genl_multicast_group thermal_event_mcgrp = {
1498        .name = THERMAL_GENL_MCAST_GROUP_NAME,
1499};
1500
1501int thermal_generate_netlink_event(u32 orig, enum events event)
1502{
1503        struct sk_buff *skb;
1504        struct nlattr *attr;
1505        struct thermal_genl_event *thermal_event;
1506        void *msg_header;
1507        int size;
1508        int result;
1509        static unsigned int thermal_event_seqnum;
1510
1511        /* allocate memory */
1512        size = nla_total_size(sizeof(struct thermal_genl_event)) +
1513               nla_total_size(0);
1514
1515        skb = genlmsg_new(size, GFP_ATOMIC);
1516        if (!skb)
1517                return -ENOMEM;
1518
1519        /* add the genetlink message header */
1520        msg_header = genlmsg_put(skb, 0, thermal_event_seqnum++,
1521                                 &thermal_event_genl_family, 0,
1522                                 THERMAL_GENL_CMD_EVENT);
1523        if (!msg_header) {
1524                nlmsg_free(skb);
1525                return -ENOMEM;
1526        }
1527
1528        /* fill the data */
1529        attr = nla_reserve(skb, THERMAL_GENL_ATTR_EVENT,
1530                           sizeof(struct thermal_genl_event));
1531
1532        if (!attr) {
1533                nlmsg_free(skb);
1534                return -EINVAL;
1535        }
1536
1537        thermal_event = nla_data(attr);
1538        if (!thermal_event) {
1539                nlmsg_free(skb);
1540                return -EINVAL;
1541        }
1542
1543        memset(thermal_event, 0, sizeof(struct thermal_genl_event));
1544
1545        thermal_event->orig = orig;
1546        thermal_event->event = event;
1547
1548        /* send multicast genetlink message */
1549        result = genlmsg_end(skb, msg_header);
1550        if (result < 0) {
1551                nlmsg_free(skb);
1552                return result;
1553        }
1554
1555        result = genlmsg_multicast(skb, 0, thermal_event_mcgrp.id, GFP_ATOMIC);
1556        if (result)
1557                pr_info("failed to send netlink event:%d\n", result);
1558
1559        return result;
1560}
1561EXPORT_SYMBOL(thermal_generate_netlink_event);
1562
1563static int genetlink_init(void)
1564{
1565        int result;
1566
1567        result = genl_register_family(&thermal_event_genl_family);
1568        if (result)
1569                return result;
1570
1571        result = genl_register_mc_group(&thermal_event_genl_family,
1572                                        &thermal_event_mcgrp);
1573        if (result)
1574                genl_unregister_family(&thermal_event_genl_family);
1575        return result;
1576}
1577
1578static void genetlink_exit(void)
1579{
1580        genl_unregister_family(&thermal_event_genl_family);
1581}
1582#else /* !CONFIG_NET */
1583static inline int genetlink_init(void) { return 0; }
1584static inline void genetlink_exit(void) {}
1585#endif /* !CONFIG_NET */
1586
1587static int __init thermal_init(void)
1588{
1589        int result = 0;
1590
1591        result = class_register(&thermal_class);
1592        if (result) {
1593                idr_destroy(&thermal_tz_idr);
1594                idr_destroy(&thermal_cdev_idr);
1595                mutex_destroy(&thermal_idr_lock);
1596                mutex_destroy(&thermal_list_lock);
1597        }
1598        result = genetlink_init();
1599        return result;
1600}
1601
1602static void __exit thermal_exit(void)
1603{
1604        class_unregister(&thermal_class);
1605        idr_destroy(&thermal_tz_idr);
1606        idr_destroy(&thermal_cdev_idr);
1607        mutex_destroy(&thermal_idr_lock);
1608        mutex_destroy(&thermal_list_lock);
1609        genetlink_exit();
1610}
1611
1612fs_initcall(thermal_init);
1613module_exit(thermal_exit);
1614
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