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
  44struct thermal_cooling_device_instance {
  45        int id;
  46        char name[THERMAL_NAME_LENGTH];
  47        struct thermal_zone_device *tz;
  48        struct thermal_cooling_device *cdev;
  49        int trip;
  50        char attr_name[THERMAL_NAME_LENGTH];
  51        struct device_attribute attr;
  52        struct list_head node;
  53};
  54
  55static DEFINE_IDR(thermal_tz_idr);
  56static DEFINE_IDR(thermal_cdev_idr);
  57static DEFINE_MUTEX(thermal_idr_lock);
  58
  59static LIST_HEAD(thermal_tz_list);
  60static LIST_HEAD(thermal_cdev_list);
  61static DEFINE_MUTEX(thermal_list_lock);
  62
  63static int get_idr(struct idr *idr, struct mutex *lock, int *id)
  64{
  65        int err;
  66
  67again:
  68        if (unlikely(idr_pre_get(idr, GFP_KERNEL) == 0))
  69                return -ENOMEM;
  70
  71        if (lock)
  72                mutex_lock(lock);
  73        err = idr_get_new(idr, NULL, id);
  74        if (lock)
  75                mutex_unlock(lock);
  76        if (unlikely(err == -EAGAIN))
  77                goto again;
  78        else if (unlikely(err))
  79                return err;
  80
  81        *id = *id & MAX_ID_MASK;
  82        return 0;
  83}
  84
  85static void release_idr(struct idr *idr, struct mutex *lock, int id)
  86{
  87        if (lock)
  88                mutex_lock(lock);
  89        idr_remove(idr, id);
  90        if (lock)
  91                mutex_unlock(lock);
  92}
  93
  94/* sys I/F for thermal zone */
  95
  96#define to_thermal_zone(_dev) \
  97        container_of(_dev, struct thermal_zone_device, device)
  98
  99static ssize_t
 100type_show(struct device *dev, struct device_attribute *attr, char *buf)
 101{
 102        struct thermal_zone_device *tz = to_thermal_zone(dev);
 103
 104        return sprintf(buf, "%s\n", tz->type);
 105}
 106
 107static ssize_t
 108temp_show(struct device *dev, struct device_attribute *attr, char *buf)
 109{
 110        struct thermal_zone_device *tz = to_thermal_zone(dev);
 111        long temperature;
 112        int ret;
 113
 114        if (!tz->ops->get_temp)
 115                return -EPERM;
 116
 117        ret = tz->ops->get_temp(tz, &temperature);
 118
 119        if (ret)
 120                return ret;
 121
 122        return sprintf(buf, "%ld\n", temperature);
 123}
 124
 125static ssize_t
 126mode_show(struct device *dev, struct device_attribute *attr, char *buf)
 127{
 128        struct thermal_zone_device *tz = to_thermal_zone(dev);
 129        enum thermal_device_mode mode;
 130        int result;
 131
 132        if (!tz->ops->get_mode)
 133                return -EPERM;
 134
 135        result = tz->ops->get_mode(tz, &mode);
 136        if (result)
 137                return result;
 138
 139        return sprintf(buf, "%s\n", mode == THERMAL_DEVICE_ENABLED ? "enabled"
 140                       : "disabled");
 141}
 142
 143static ssize_t
 144mode_store(struct device *dev, struct device_attribute *attr,
 145           const char *buf, size_t count)
 146{
 147        struct thermal_zone_device *tz = to_thermal_zone(dev);
 148        int result;
 149
 150        if (!tz->ops->set_mode)
 151                return -EPERM;
 152
 153        if (!strncmp(buf, "enabled", sizeof("enabled") - 1))
 154                result = tz->ops->set_mode(tz, THERMAL_DEVICE_ENABLED);
 155        else if (!strncmp(buf, "disabled", sizeof("disabled") - 1))
 156                result = tz->ops->set_mode(tz, THERMAL_DEVICE_DISABLED);
 157        else
 158                result = -EINVAL;
 159
 160        if (result)
 161                return result;
 162
 163        return count;
 164}
 165
 166static ssize_t
 167trip_point_type_show(struct device *dev, struct device_attribute *attr,
 168                     char *buf)
 169{
 170        struct thermal_zone_device *tz = to_thermal_zone(dev);
 171        enum thermal_trip_type type;
 172        int trip, result;
 173
 174        if (!tz->ops->get_trip_type)
 175                return -EPERM;
 176
 177        if (!sscanf(attr->attr.name, "trip_point_%d_type", &trip))
 178                return -EINVAL;
 179
 180        result = tz->ops->get_trip_type(tz, trip, &type);
 181        if (result)
 182                return result;
 183
 184        switch (type) {
 185        case THERMAL_TRIP_CRITICAL:
 186                return sprintf(buf, "critical\n");
 187        case THERMAL_TRIP_HOT:
 188                return sprintf(buf, "hot\n");
 189        case THERMAL_TRIP_PASSIVE:
 190                return sprintf(buf, "passive\n");
 191        case THERMAL_TRIP_ACTIVE:
 192                return sprintf(buf, "active\n");
 193        default:
 194                return sprintf(buf, "unknown\n");
 195        }
 196}
 197
 198static ssize_t
 199trip_point_temp_store(struct device *dev, struct device_attribute *attr,
 200                     const char *buf, size_t count)
 201{
 202        struct thermal_zone_device *tz = to_thermal_zone(dev);
 203        int trip, ret;
 204        unsigned long temperature;
 205
 206        if (!tz->ops->set_trip_temp)
 207                return -EPERM;
 208
 209        if (!sscanf(attr->attr.name, "trip_point_%d_temp", &trip))
 210                return -EINVAL;
 211
 212        if (kstrtoul(buf, 10, &temperature))
 213                return -EINVAL;
 214
 215        ret = tz->ops->set_trip_temp(tz, trip, temperature);
 216
 217        return ret ? ret : count;
 218}
 219
 220static ssize_t
 221trip_point_temp_show(struct device *dev, struct device_attribute *attr,
 222                     char *buf)
 223{
 224        struct thermal_zone_device *tz = to_thermal_zone(dev);
 225        int trip, ret;
 226        long temperature;
 227
 228        if (!tz->ops->get_trip_temp)
 229                return -EPERM;
 230
 231        if (!sscanf(attr->attr.name, "trip_point_%d_temp", &trip))
 232                return -EINVAL;
 233
 234        ret = tz->ops->get_trip_temp(tz, trip, &temperature);
 235
 236        if (ret)
 237                return ret;
 238
 239        return sprintf(buf, "%ld\n", temperature);
 240}
 241
 242static ssize_t
 243trip_point_hyst_store(struct device *dev, struct device_attribute *attr,
 244                        const char *buf, size_t count)
 245{
 246        struct thermal_zone_device *tz = to_thermal_zone(dev);
 247        int trip, ret;
 248        unsigned long temperature;
 249
 250        if (!tz->ops->set_trip_hyst)
 251                return -EPERM;
 252
 253        if (!sscanf(attr->attr.name, "trip_point_%d_hyst", &trip))
 254                return -EINVAL;
 255
 256        if (kstrtoul(buf, 10, &temperature))
 257                return -EINVAL;
 258
 259        /*
 260         * We are not doing any check on the 'temperature' value
 261         * here. The driver implementing 'set_trip_hyst' has to
 262         * take care of this.
 263         */
 264        ret = tz->ops->set_trip_hyst(tz, trip, temperature);
 265
 266        return ret ? ret : count;
 267}
 268
 269static ssize_t
 270trip_point_hyst_show(struct device *dev, struct device_attribute *attr,
 271                        char *buf)
 272{
 273        struct thermal_zone_device *tz = to_thermal_zone(dev);
 274        int trip, ret;
 275        unsigned long temperature;
 276
 277        if (!tz->ops->get_trip_hyst)
 278                return -EPERM;
 279
 280        if (!sscanf(attr->attr.name, "trip_point_%d_hyst", &trip))
 281                return -EINVAL;
 282
 283        ret = tz->ops->get_trip_hyst(tz, trip, &temperature);
 284
 285        return ret ? ret : sprintf(buf, "%ld\n", temperature);
 286}
 287
 288static ssize_t
 289passive_store(struct device *dev, struct device_attribute *attr,
 290                    const char *buf, size_t count)
 291{
 292        struct thermal_zone_device *tz = to_thermal_zone(dev);
 293        struct thermal_cooling_device *cdev = NULL;
 294        int state;
 295
 296        if (!sscanf(buf, "%d\n", &state))
 297                return -EINVAL;
 298
 299        /* sanity check: values below 1000 millicelcius don't make sense
 300         * and can cause the system to go into a thermal heart attack
 301         */
 302        if (state && state < 1000)
 303                return -EINVAL;
 304
 305        if (state && !tz->forced_passive) {
 306                mutex_lock(&thermal_list_lock);
 307                list_for_each_entry(cdev, &thermal_cdev_list, node) {
 308                        if (!strncmp("Processor", cdev->type,
 309                                     sizeof("Processor")))
 310                                thermal_zone_bind_cooling_device(tz,
 311                                                                 THERMAL_TRIPS_NONE,
 312                                                                 cdev);
 313                }
 314                mutex_unlock(&thermal_list_lock);
 315                if (!tz->passive_delay)
 316                        tz->passive_delay = 1000;
 317        } else if (!state && tz->forced_passive) {
 318                mutex_lock(&thermal_list_lock);
 319                list_for_each_entry(cdev, &thermal_cdev_list, node) {
 320                        if (!strncmp("Processor", cdev->type,
 321                                     sizeof("Processor")))
 322                                thermal_zone_unbind_cooling_device(tz,
 323                                                                   THERMAL_TRIPS_NONE,
 324                                                                   cdev);
 325                }
 326                mutex_unlock(&thermal_list_lock);
 327                tz->passive_delay = 0;
 328        }
 329
 330        tz->tc1 = 1;
 331        tz->tc2 = 1;
 332
 333        tz->forced_passive = state;
 334
 335        thermal_zone_device_update(tz);
 336
 337        return count;
 338}
 339
 340static ssize_t
 341passive_show(struct device *dev, struct device_attribute *attr,
 342                   char *buf)
 343{
 344        struct thermal_zone_device *tz = to_thermal_zone(dev);
 345
 346        return sprintf(buf, "%d\n", tz->forced_passive);
 347}
 348
 349static DEVICE_ATTR(type, 0444, type_show, NULL);
 350static DEVICE_ATTR(temp, 0444, temp_show, NULL);
 351static DEVICE_ATTR(mode, 0644, mode_show, mode_store);
 352static DEVICE_ATTR(passive, S_IRUGO | S_IWUSR, passive_show, passive_store);
 353
 354/* sys I/F for cooling device */
 355#define to_cooling_device(_dev) \
 356        container_of(_dev, struct thermal_cooling_device, device)
 357
 358static ssize_t
 359thermal_cooling_device_type_show(struct device *dev,
 360                                 struct device_attribute *attr, char *buf)
 361{
 362        struct thermal_cooling_device *cdev = to_cooling_device(dev);
 363
 364        return sprintf(buf, "%s\n", cdev->type);
 365}
 366
 367static ssize_t
 368thermal_cooling_device_max_state_show(struct device *dev,
 369                                      struct device_attribute *attr, char *buf)
 370{
 371        struct thermal_cooling_device *cdev = to_cooling_device(dev);
 372        unsigned long state;
 373        int ret;
 374
 375        ret = cdev->ops->get_max_state(cdev, &state);
 376        if (ret)
 377                return ret;
 378        return sprintf(buf, "%ld\n", state);
 379}
 380
 381static ssize_t
 382thermal_cooling_device_cur_state_show(struct device *dev,
 383                                      struct device_attribute *attr, char *buf)
 384{
 385        struct thermal_cooling_device *cdev = to_cooling_device(dev);
 386        unsigned long state;
 387        int ret;
 388
 389        ret = cdev->ops->get_cur_state(cdev, &state);
 390        if (ret)
 391                return ret;
 392        return sprintf(buf, "%ld\n", state);
 393}
 394
 395static ssize_t
 396thermal_cooling_device_cur_state_store(struct device *dev,
 397                                       struct device_attribute *attr,
 398                                       const char *buf, size_t count)
 399{
 400        struct thermal_cooling_device *cdev = to_cooling_device(dev);
 401        unsigned long state;
 402        int result;
 403
 404        if (!sscanf(buf, "%ld\n", &state))
 405                return -EINVAL;
 406
 407        if ((long)state < 0)
 408                return -EINVAL;
 409
 410        result = cdev->ops->set_cur_state(cdev, state);
 411        if (result)
 412                return result;
 413        return count;
 414}
 415
 416static struct device_attribute dev_attr_cdev_type =
 417__ATTR(type, 0444, thermal_cooling_device_type_show, NULL);
 418static DEVICE_ATTR(max_state, 0444,
 419                   thermal_cooling_device_max_state_show, NULL);
 420static DEVICE_ATTR(cur_state, 0644,
 421                   thermal_cooling_device_cur_state_show,
 422                   thermal_cooling_device_cur_state_store);
 423
 424static ssize_t
 425thermal_cooling_device_trip_point_show(struct device *dev,
 426                                       struct device_attribute *attr, char *buf)
 427{
 428        struct thermal_cooling_device_instance *instance;
 429
 430        instance =
 431            container_of(attr, struct thermal_cooling_device_instance, attr);
 432
 433        if (instance->trip == THERMAL_TRIPS_NONE)
 434                return sprintf(buf, "-1\n");
 435        else
 436                return sprintf(buf, "%d\n", instance->trip);
 437}
 438
 439/* Device management */
 440
 441#if defined(CONFIG_THERMAL_HWMON)
 442
 443/* hwmon sys I/F */
 444#include <linux/hwmon.h>
 445
 446/* thermal zone devices with the same type share one hwmon device */
 447struct thermal_hwmon_device {
 448        char type[THERMAL_NAME_LENGTH];
 449        struct device *device;
 450        int count;
 451        struct list_head tz_list;
 452        struct list_head node;
 453};
 454
 455struct thermal_hwmon_attr {
 456        struct device_attribute attr;
 457        char name[16];
 458};
 459
 460/* one temperature input for each thermal zone */
 461struct thermal_hwmon_temp {
 462        struct list_head hwmon_node;
 463        struct thermal_zone_device *tz;
 464        struct thermal_hwmon_attr temp_input;   /* hwmon sys attr */
 465        struct thermal_hwmon_attr temp_crit;    /* hwmon sys attr */
 466};
 467
 468static LIST_HEAD(thermal_hwmon_list);
 469
 470static ssize_t
 471name_show(struct device *dev, struct device_attribute *attr, char *buf)
 472{
 473        struct thermal_hwmon_device *hwmon = dev_get_drvdata(dev);
 474        return sprintf(buf, "%s\n", hwmon->type);
 475}
 476static DEVICE_ATTR(name, 0444, name_show, NULL);
 477
 478static ssize_t
 479temp_input_show(struct device *dev, struct device_attribute *attr, char *buf)
 480{
 481        long temperature;
 482        int ret;
 483        struct thermal_hwmon_attr *hwmon_attr
 484                        = container_of(attr, struct thermal_hwmon_attr, attr);
 485        struct thermal_hwmon_temp *temp
 486                        = container_of(hwmon_attr, struct thermal_hwmon_temp,
 487                                       temp_input);
 488        struct thermal_zone_device *tz = temp->tz;
 489
 490        ret = tz->ops->get_temp(tz, &temperature);
 491
 492        if (ret)
 493                return ret;
 494
 495        return sprintf(buf, "%ld\n", temperature);
 496}
 497
 498static ssize_t
 499temp_crit_show(struct device *dev, struct device_attribute *attr,
 500                char *buf)
 501{
 502        struct thermal_hwmon_attr *hwmon_attr
 503                        = container_of(attr, struct thermal_hwmon_attr, attr);
 504        struct thermal_hwmon_temp *temp
 505                        = container_of(hwmon_attr, struct thermal_hwmon_temp,
 506                                       temp_crit);
 507        struct thermal_zone_device *tz = temp->tz;
 508        long temperature;
 509        int ret;
 510
 511        ret = tz->ops->get_trip_temp(tz, 0, &temperature);
 512        if (ret)
 513                return ret;
 514
 515        return sprintf(buf, "%ld\n", temperature);
 516}
 517
 518
 519static struct thermal_hwmon_device *
 520thermal_hwmon_lookup_by_type(const struct thermal_zone_device *tz)
 521{
 522        struct thermal_hwmon_device *hwmon;
 523
 524        mutex_lock(&thermal_list_lock);
 525        list_for_each_entry(hwmon, &thermal_hwmon_list, node)
 526                if (!strcmp(hwmon->type, tz->type)) {
 527                        mutex_unlock(&thermal_list_lock);
 528                        return hwmon;
 529                }
 530        mutex_unlock(&thermal_list_lock);
 531
 532        return NULL;
 533}
 534
 535/* Find the temperature input matching a given thermal zone */
 536static struct thermal_hwmon_temp *
 537thermal_hwmon_lookup_temp(const struct thermal_hwmon_device *hwmon,
 538                          const struct thermal_zone_device *tz)
 539{
 540        struct thermal_hwmon_temp *temp;
 541
 542        mutex_lock(&thermal_list_lock);
 543        list_for_each_entry(temp, &hwmon->tz_list, hwmon_node)
 544                if (temp->tz == tz) {
 545                        mutex_unlock(&thermal_list_lock);
 546                        return temp;
 547                }
 548        mutex_unlock(&thermal_list_lock);
 549
 550        return NULL;
 551}
 552
 553static int
 554thermal_add_hwmon_sysfs(struct thermal_zone_device *tz)
 555{
 556        struct thermal_hwmon_device *hwmon;
 557        struct thermal_hwmon_temp *temp;
 558        int new_hwmon_device = 1;
 559        int result;
 560
 561        hwmon = thermal_hwmon_lookup_by_type(tz);
 562        if (hwmon) {
 563                new_hwmon_device = 0;
 564                goto register_sys_interface;
 565        }
 566
 567        hwmon = kzalloc(sizeof(struct thermal_hwmon_device), GFP_KERNEL);
 568        if (!hwmon)
 569                return -ENOMEM;
 570
 571        INIT_LIST_HEAD(&hwmon->tz_list);
 572        strlcpy(hwmon->type, tz->type, THERMAL_NAME_LENGTH);
 573        hwmon->device = hwmon_device_register(NULL);
 574        if (IS_ERR(hwmon->device)) {
 575                result = PTR_ERR(hwmon->device);
 576                goto free_mem;
 577        }
 578        dev_set_drvdata(hwmon->device, hwmon);
 579        result = device_create_file(hwmon->device, &dev_attr_name);
 580        if (result)
 581                goto free_mem;
 582
 583 register_sys_interface:
 584        temp = kzalloc(sizeof(struct thermal_hwmon_temp), GFP_KERNEL);
 585        if (!temp) {
 586                result = -ENOMEM;
 587                goto unregister_name;
 588        }
 589
 590        temp->tz = tz;
 591        hwmon->count++;
 592
 593        snprintf(temp->temp_input.name, THERMAL_NAME_LENGTH,
 594                 "temp%d_input", hwmon->count);
 595        temp->temp_input.attr.attr.name = temp->temp_input.name;
 596        temp->temp_input.attr.attr.mode = 0444;
 597        temp->temp_input.attr.show = temp_input_show;
 598        sysfs_attr_init(&temp->temp_input.attr.attr);
 599        result = device_create_file(hwmon->device, &temp->temp_input.attr);
 600        if (result)
 601                goto free_temp_mem;
 602
 603        if (tz->ops->get_crit_temp) {
 604                unsigned long temperature;
 605                if (!tz->ops->get_crit_temp(tz, &temperature)) {
 606                        snprintf(temp->temp_crit.name, THERMAL_NAME_LENGTH,
 607                                "temp%d_crit", hwmon->count);
 608                        temp->temp_crit.attr.attr.name = temp->temp_crit.name;
 609                        temp->temp_crit.attr.attr.mode = 0444;
 610                        temp->temp_crit.attr.show = temp_crit_show;
 611                        sysfs_attr_init(&temp->temp_crit.attr.attr);
 612                        result = device_create_file(hwmon->device,
 613                                                    &temp->temp_crit.attr);
 614                        if (result)
 615                                goto unregister_input;
 616                }
 617        }
 618
 619        mutex_lock(&thermal_list_lock);
 620        if (new_hwmon_device)
 621                list_add_tail(&hwmon->node, &thermal_hwmon_list);
 622        list_add_tail(&temp->hwmon_node, &hwmon->tz_list);
 623        mutex_unlock(&thermal_list_lock);
 624
 625        return 0;
 626
 627 unregister_input:
 628        device_remove_file(hwmon->device, &temp->temp_input.attr);
 629 free_temp_mem:
 630        kfree(temp);
 631 unregister_name:
 632        if (new_hwmon_device) {
 633                device_remove_file(hwmon->device, &dev_attr_name);
 634                hwmon_device_unregister(hwmon->device);
 635        }
 636 free_mem:
 637        if (new_hwmon_device)
 638                kfree(hwmon);
 639
 640        return result;
 641}
 642
 643static void
 644thermal_remove_hwmon_sysfs(struct thermal_zone_device *tz)
 645{
 646        struct thermal_hwmon_device *hwmon;
 647        struct thermal_hwmon_temp *temp;
 648
 649        hwmon = thermal_hwmon_lookup_by_type(tz);
 650        if (unlikely(!hwmon)) {
 651                /* Should never happen... */
 652                dev_dbg(&tz->device, "hwmon device lookup failed!\n");
 653                return;
 654        }
 655
 656        temp = thermal_hwmon_lookup_temp(hwmon, tz);
 657        if (unlikely(!temp)) {
 658                /* Should never happen... */
 659                dev_dbg(&tz->device, "temperature input lookup failed!\n");
 660                return;
 661        }
 662
 663        device_remove_file(hwmon->device, &temp->temp_input.attr);
 664        if (tz->ops->get_crit_temp)
 665                device_remove_file(hwmon->device, &temp->temp_crit.attr);
 666
 667        mutex_lock(&thermal_list_lock);
 668        list_del(&temp->hwmon_node);
 669        kfree(temp);
 670        if (!list_empty(&hwmon->tz_list)) {
 671                mutex_unlock(&thermal_list_lock);
 672                return;
 673        }
 674        list_del(&hwmon->node);
 675        mutex_unlock(&thermal_list_lock);
 676
 677        device_remove_file(hwmon->device, &dev_attr_name);
 678        hwmon_device_unregister(hwmon->device);
 679        kfree(hwmon);
 680}
 681#else
 682static int
 683thermal_add_hwmon_sysfs(struct thermal_zone_device *tz)
 684{
 685        return 0;
 686}
 687
 688static void
 689thermal_remove_hwmon_sysfs(struct thermal_zone_device *tz)
 690{
 691}
 692#endif
 693
 694static void thermal_zone_device_set_polling(struct thermal_zone_device *tz,
 695                                            int delay)
 696{
 697        cancel_delayed_work(&(tz->poll_queue));
 698
 699        if (!delay)
 700                return;
 701
 702        if (delay > 1000)
 703                queue_delayed_work(system_freezable_wq, &(tz->poll_queue),
 704                                      round_jiffies(msecs_to_jiffies(delay)));
 705        else
 706                queue_delayed_work(system_freezable_wq, &(tz->poll_queue),
 707                                      msecs_to_jiffies(delay));
 708}
 709
 710static void thermal_zone_device_passive(struct thermal_zone_device *tz,
 711                                        int temp, int trip_temp, int trip)
 712{
 713        int trend = 0;
 714        struct thermal_cooling_device_instance *instance;
 715        struct thermal_cooling_device *cdev;
 716        long state, max_state;
 717
 718        /*
 719         * Above Trip?
 720         * -----------
 721         * Calculate the thermal trend (using the passive cooling equation)
 722         * and modify the performance limit for all passive cooling devices
 723         * accordingly.  Note that we assume symmetry.
 724         */
 725        if (temp >= trip_temp) {
 726                tz->passive = true;
 727
 728                trend = (tz->tc1 * (temp - tz->last_temperature)) +
 729                        (tz->tc2 * (temp - trip_temp));
 730
 731                /* Heating up? */
 732                if (trend > 0) {
 733                        list_for_each_entry(instance, &tz->cooling_devices,
 734                                            node) {
 735                                if (instance->trip != trip)
 736                                        continue;
 737                                cdev = instance->cdev;
 738                                cdev->ops->get_cur_state(cdev, &state);
 739                                cdev->ops->get_max_state(cdev, &max_state);
 740                                if (state++ < max_state)
 741                                        cdev->ops->set_cur_state(cdev, state);
 742                        }
 743                } else if (trend < 0) { /* Cooling off? */
 744                        list_for_each_entry(instance, &tz->cooling_devices,
 745                                            node) {
 746                                if (instance->trip != trip)
 747                                        continue;
 748                                cdev = instance->cdev;
 749                                cdev->ops->get_cur_state(cdev, &state);
 750                                cdev->ops->get_max_state(cdev, &max_state);
 751                                if (state > 0)
 752                                        cdev->ops->set_cur_state(cdev, --state);
 753                        }
 754                }
 755                return;
 756        }
 757
 758        /*
 759         * Below Trip?
 760         * -----------
 761         * Implement passive cooling hysteresis to slowly increase performance
 762         * and avoid thrashing around the passive trip point.  Note that we
 763         * assume symmetry.
 764         */
 765        list_for_each_entry(instance, &tz->cooling_devices, node) {
 766                if (instance->trip != trip)
 767                        continue;
 768                cdev = instance->cdev;
 769                cdev->ops->get_cur_state(cdev, &state);
 770                cdev->ops->get_max_state(cdev, &max_state);
 771                if (state > 0)
 772                        cdev->ops->set_cur_state(cdev, --state);
 773                if (state == 0)
 774                        tz->passive = false;
 775        }
 776}
 777
 778static void thermal_zone_device_check(struct work_struct *work)
 779{
 780        struct thermal_zone_device *tz = container_of(work, struct
 781                                                      thermal_zone_device,
 782                                                      poll_queue.work);
 783        thermal_zone_device_update(tz);
 784}
 785
 786/**
 787 * thermal_zone_bind_cooling_device - bind a cooling device to a thermal zone
 788 * @tz:         thermal zone device
 789 * @trip:       indicates which trip point the cooling devices is
 790 *              associated with in this thermal zone.
 791 * @cdev:       thermal cooling device
 792 *
 793 * This function is usually called in the thermal zone device .bind callback.
 794 */
 795int thermal_zone_bind_cooling_device(struct thermal_zone_device *tz,
 796                                     int trip,
 797                                     struct thermal_cooling_device *cdev)
 798{
 799        struct thermal_cooling_device_instance *dev;
 800        struct thermal_cooling_device_instance *pos;
 801        struct thermal_zone_device *pos1;
 802        struct thermal_cooling_device *pos2;
 803        int result;
 804
 805        if (trip >= tz->trips || (trip < 0 && trip != THERMAL_TRIPS_NONE))
 806                return -EINVAL;
 807
 808        list_for_each_entry(pos1, &thermal_tz_list, node) {
 809                if (pos1 == tz)
 810                        break;
 811        }
 812        list_for_each_entry(pos2, &thermal_cdev_list, node) {
 813                if (pos2 == cdev)
 814                        break;
 815        }
 816
 817        if (tz != pos1 || cdev != pos2)
 818                return -EINVAL;
 819
 820        dev =
 821            kzalloc(sizeof(struct thermal_cooling_device_instance), GFP_KERNEL);
 822        if (!dev)
 823                return -ENOMEM;
 824        dev->tz = tz;
 825        dev->cdev = cdev;
 826        dev->trip = trip;
 827        result = get_idr(&tz->idr, &tz->lock, &dev->id);
 828        if (result)
 829                goto free_mem;
 830
 831        sprintf(dev->name, "cdev%d", dev->id);
 832        result =
 833            sysfs_create_link(&tz->device.kobj, &cdev->device.kobj, dev->name);
 834        if (result)
 835                goto release_idr;
 836
 837        sprintf(dev->attr_name, "cdev%d_trip_point", dev->id);
 838        sysfs_attr_init(&dev->attr.attr);
 839        dev->attr.attr.name = dev->attr_name;
 840        dev->attr.attr.mode = 0444;
 841        dev->attr.show = thermal_cooling_device_trip_point_show;
 842        result = device_create_file(&tz->device, &dev->attr);
 843        if (result)
 844                goto remove_symbol_link;
 845
 846        mutex_lock(&tz->lock);
 847        list_for_each_entry(pos, &tz->cooling_devices, node)
 848            if (pos->tz == tz && pos->trip == trip && pos->cdev == cdev) {
 849                result = -EEXIST;
 850                break;
 851        }
 852        if (!result)
 853                list_add_tail(&dev->node, &tz->cooling_devices);
 854        mutex_unlock(&tz->lock);
 855
 856        if (!result)
 857                return 0;
 858
 859        device_remove_file(&tz->device, &dev->attr);
 860remove_symbol_link:
 861        sysfs_remove_link(&tz->device.kobj, dev->name);
 862release_idr:
 863        release_idr(&tz->idr, &tz->lock, dev->id);
 864free_mem:
 865        kfree(dev);
 866        return result;
 867}
 868EXPORT_SYMBOL(thermal_zone_bind_cooling_device);
 869
 870/**
 871 * thermal_zone_unbind_cooling_device - unbind a cooling device from a thermal zone
 872 * @tz:         thermal zone device
 873 * @trip:       indicates which trip point the cooling devices is
 874 *              associated with in this thermal zone.
 875 * @cdev:       thermal cooling device
 876 *
 877 * This function is usually called in the thermal zone device .unbind callback.
 878 */
 879int thermal_zone_unbind_cooling_device(struct thermal_zone_device *tz,
 880                                       int trip,
 881                                       struct thermal_cooling_device *cdev)
 882{
 883        struct thermal_cooling_device_instance *pos, *next;
 884
 885        mutex_lock(&tz->lock);
 886        list_for_each_entry_safe(pos, next, &tz->cooling_devices, node) {
 887                if (pos->tz == tz && pos->trip == trip && pos->cdev == cdev) {
 888                        list_del(&pos->node);
 889                        mutex_unlock(&tz->lock);
 890                        goto unbind;
 891                }
 892        }
 893        mutex_unlock(&tz->lock);
 894
 895        return -ENODEV;
 896
 897unbind:
 898        device_remove_file(&tz->device, &pos->attr);
 899        sysfs_remove_link(&tz->device.kobj, pos->name);
 900        release_idr(&tz->idr, &tz->lock, pos->id);
 901        kfree(pos);
 902        return 0;
 903}
 904EXPORT_SYMBOL(thermal_zone_unbind_cooling_device);
 905
 906static void thermal_release(struct device *dev)
 907{
 908        struct thermal_zone_device *tz;
 909        struct thermal_cooling_device *cdev;
 910
 911        if (!strncmp(dev_name(dev), "thermal_zone",
 912                     sizeof("thermal_zone") - 1)) {
 913                tz = to_thermal_zone(dev);
 914                kfree(tz);
 915        } else {
 916                cdev = to_cooling_device(dev);
 917                kfree(cdev);
 918        }
 919}
 920
 921static struct class thermal_class = {
 922        .name = "thermal",
 923        .dev_release = thermal_release,
 924};
 925
 926/**
 927 * thermal_cooling_device_register - register a new thermal cooling device
 928 * @type:       the thermal cooling device type.
 929 * @devdata:    device private data.
 930 * @ops:                standard thermal cooling devices callbacks.
 931 */
 932struct thermal_cooling_device *
 933thermal_cooling_device_register(char *type, void *devdata,
 934                                const struct thermal_cooling_device_ops *ops)
 935{
 936        struct thermal_cooling_device *cdev;
 937        struct thermal_zone_device *pos;
 938        int result;
 939
 940        if (strlen(type) >= THERMAL_NAME_LENGTH)
 941                return ERR_PTR(-EINVAL);
 942
 943        if (!ops || !ops->get_max_state || !ops->get_cur_state ||
 944            !ops->set_cur_state)
 945                return ERR_PTR(-EINVAL);
 946
 947        cdev = kzalloc(sizeof(struct thermal_cooling_device), GFP_KERNEL);
 948        if (!cdev)
 949                return ERR_PTR(-ENOMEM);
 950
 951        result = get_idr(&thermal_cdev_idr, &thermal_idr_lock, &cdev->id);
 952        if (result) {
 953                kfree(cdev);
 954                return ERR_PTR(result);
 955        }
 956
 957        strcpy(cdev->type, type);
 958        cdev->ops = ops;
 959        cdev->device.class = &thermal_class;
 960        cdev->devdata = devdata;
 961        dev_set_name(&cdev->device, "cooling_device%d", cdev->id);
 962        result = device_register(&cdev->device);
 963        if (result) {
 964                release_idr(&thermal_cdev_idr, &thermal_idr_lock, cdev->id);
 965                kfree(cdev);
 966                return ERR_PTR(result);
 967        }
 968
 969        /* sys I/F */
 970        if (type) {
 971                result = device_create_file(&cdev->device, &dev_attr_cdev_type);
 972                if (result)
 973                        goto unregister;
 974        }
 975
 976        result = device_create_file(&cdev->device, &dev_attr_max_state);
 977        if (result)
 978                goto unregister;
 979
 980        result = device_create_file(&cdev->device, &dev_attr_cur_state);
 981        if (result)
 982                goto unregister;
 983
 984        mutex_lock(&thermal_list_lock);
 985        list_add(&cdev->node, &thermal_cdev_list);
 986        list_for_each_entry(pos, &thermal_tz_list, node) {
 987                if (!pos->ops->bind)
 988                        continue;
 989                result = pos->ops->bind(pos, cdev);
 990                if (result)
 991                        break;
 992
 993        }
 994        mutex_unlock(&thermal_list_lock);
 995
 996        if (!result)
 997                return cdev;
 998
 999unregister:
1000        release_idr(&thermal_cdev_idr, &thermal_idr_lock, cdev->id);
1001        device_unregister(&cdev->device);
1002        return ERR_PTR(result);
1003}
1004EXPORT_SYMBOL(thermal_cooling_device_register);
1005
1006/**
1007 * thermal_cooling_device_unregister - removes the registered thermal cooling device
1008 * @cdev:       the thermal cooling device to remove.
1009 *
1010 * thermal_cooling_device_unregister() must be called when the device is no
1011 * longer needed.
1012 */
1013void thermal_cooling_device_unregister(struct
1014                                       thermal_cooling_device
1015                                       *cdev)
1016{
1017        struct thermal_zone_device *tz;
1018        struct thermal_cooling_device *pos = NULL;
1019
1020        if (!cdev)
1021                return;
1022
1023        mutex_lock(&thermal_list_lock);
1024        list_for_each_entry(pos, &thermal_cdev_list, node)
1025            if (pos == cdev)
1026                break;
1027        if (pos != cdev) {
1028                /* thermal cooling device not found */
1029                mutex_unlock(&thermal_list_lock);
1030                return;
1031        }
1032        list_del(&cdev->node);
1033        list_for_each_entry(tz, &thermal_tz_list, node) {
1034                if (!tz->ops->unbind)
1035                        continue;
1036                tz->ops->unbind(tz, cdev);
1037        }
1038        mutex_unlock(&thermal_list_lock);
1039        if (cdev->type[0])
1040                device_remove_file(&cdev->device, &dev_attr_cdev_type);
1041        device_remove_file(&cdev->device, &dev_attr_max_state);
1042        device_remove_file(&cdev->device, &dev_attr_cur_state);
1043
1044        release_idr(&thermal_cdev_idr, &thermal_idr_lock, cdev->id);
1045        device_unregister(&cdev->device);
1046        return;
1047}
1048EXPORT_SYMBOL(thermal_cooling_device_unregister);
1049
1050/**
1051 * thermal_zone_device_update - force an update of a thermal zone's state
1052 * @ttz:        the thermal zone to update
1053 */
1054
1055void thermal_zone_device_update(struct thermal_zone_device *tz)
1056{
1057        int count, ret = 0;
1058        long temp, trip_temp;
1059        enum thermal_trip_type trip_type;
1060        struct thermal_cooling_device_instance *instance;
1061        struct thermal_cooling_device *cdev;
1062
1063        mutex_lock(&tz->lock);
1064
1065        if (tz->ops->get_temp(tz, &temp)) {
1066                /* get_temp failed - retry it later */
1067                pr_warn("failed to read out thermal zone %d\n", tz->id);
1068                goto leave;
1069        }
1070
1071        for (count = 0; count < tz->trips; count++) {
1072                tz->ops->get_trip_type(tz, count, &trip_type);
1073                tz->ops->get_trip_temp(tz, count, &trip_temp);
1074
1075                switch (trip_type) {
1076                case THERMAL_TRIP_CRITICAL:
1077                        if (temp >= trip_temp) {
1078                                if (tz->ops->notify)
1079                                        ret = tz->ops->notify(tz, count,
1080                                                              trip_type);
1081                                if (!ret) {
1082                                        pr_emerg("Critical temperature reached (%ld C), shutting down\n",
1083                                                 temp/1000);
1084                                        orderly_poweroff(true);
1085                                }
1086                        }
1087                        break;
1088                case THERMAL_TRIP_HOT:
1089                        if (temp >= trip_temp)
1090                                if (tz->ops->notify)
1091                                        tz->ops->notify(tz, count, trip_type);
1092                        break;
1093                case THERMAL_TRIP_ACTIVE:
1094                        list_for_each_entry(instance, &tz->cooling_devices,
1095                                            node) {
1096                                if (instance->trip != count)
1097                                        continue;
1098
1099                                cdev = instance->cdev;
1100
1101                                if (temp >= trip_temp)
1102                                        cdev->ops->set_cur_state(cdev, 1);
1103                                else
1104                                        cdev->ops->set_cur_state(cdev, 0);
1105                        }
1106                        break;
1107                case THERMAL_TRIP_PASSIVE:
1108                        if (temp >= trip_temp || tz->passive)
1109                                thermal_zone_device_passive(tz, temp,
1110                                                            trip_temp, count);
1111                        break;
1112                }
1113        }
1114
1115        if (tz->forced_passive)
1116                thermal_zone_device_passive(tz, temp, tz->forced_passive,
1117                                            THERMAL_TRIPS_NONE);
1118
1119        tz->last_temperature = temp;
1120
1121leave:
1122        if (tz->passive)
1123                thermal_zone_device_set_polling(tz, tz->passive_delay);
1124        else if (tz->polling_delay)
1125                thermal_zone_device_set_polling(tz, tz->polling_delay);
1126        else
1127                thermal_zone_device_set_polling(tz, 0);
1128        mutex_unlock(&tz->lock);
1129}
1130EXPORT_SYMBOL(thermal_zone_device_update);
1131
1132/**
1133 * create_trip_attrs - create attributes for trip points
1134 * @tz:         the thermal zone device
1135 * @mask:       Writeable trip point bitmap.
1136 */
1137static int create_trip_attrs(struct thermal_zone_device *tz, int mask)
1138{
1139        int indx;
1140        int size = sizeof(struct thermal_attr) * tz->trips;
1141
1142        tz->trip_type_attrs = kzalloc(size, GFP_KERNEL);
1143        if (!tz->trip_type_attrs)
1144                return -ENOMEM;
1145
1146        tz->trip_temp_attrs = kzalloc(size, GFP_KERNEL);
1147        if (!tz->trip_temp_attrs) {
1148                kfree(tz->trip_type_attrs);
1149                return -ENOMEM;
1150        }
1151
1152        if (tz->ops->get_trip_hyst) {
1153                tz->trip_hyst_attrs = kzalloc(size, GFP_KERNEL);
1154                if (!tz->trip_hyst_attrs) {
1155                        kfree(tz->trip_type_attrs);
1156                        kfree(tz->trip_temp_attrs);
1157                        return -ENOMEM;
1158                }
1159        }
1160
1161
1162        for (indx = 0; indx < tz->trips; indx++) {
1163                /* create trip type attribute */
1164                snprintf(tz->trip_type_attrs[indx].name, THERMAL_NAME_LENGTH,
1165                         "trip_point_%d_type", indx);
1166
1167                sysfs_attr_init(&tz->trip_type_attrs[indx].attr.attr);
1168                tz->trip_type_attrs[indx].attr.attr.name =
1169                                                tz->trip_type_attrs[indx].name;
1170                tz->trip_type_attrs[indx].attr.attr.mode = S_IRUGO;
1171                tz->trip_type_attrs[indx].attr.show = trip_point_type_show;
1172
1173                device_create_file(&tz->device,
1174                                   &tz->trip_type_attrs[indx].attr);
1175
1176                /* create trip temp attribute */
1177                snprintf(tz->trip_temp_attrs[indx].name, THERMAL_NAME_LENGTH,
1178                         "trip_point_%d_temp", indx);
1179
1180                sysfs_attr_init(&tz->trip_temp_attrs[indx].attr.attr);
1181                tz->trip_temp_attrs[indx].attr.attr.name =
1182                                                tz->trip_temp_attrs[indx].name;
1183                tz->trip_temp_attrs[indx].attr.attr.mode = S_IRUGO;
1184                tz->trip_temp_attrs[indx].attr.show = trip_point_temp_show;
1185                if (mask & (1 << indx)) {
1186                        tz->trip_temp_attrs[indx].attr.attr.mode |= S_IWUSR;
1187                        tz->trip_temp_attrs[indx].attr.store =
1188                                                        trip_point_temp_store;
1189                }
1190
1191                device_create_file(&tz->device,
1192                                   &tz->trip_temp_attrs[indx].attr);
1193
1194                /* create Optional trip hyst attribute */
1195                if (!tz->ops->get_trip_hyst)
1196                        continue;
1197                snprintf(tz->trip_hyst_attrs[indx].name, THERMAL_NAME_LENGTH,
1198                         "trip_point_%d_hyst", indx);
1199
1200                sysfs_attr_init(&tz->trip_hyst_attrs[indx].attr.attr);
1201                tz->trip_hyst_attrs[indx].attr.attr.name =
1202                                        tz->trip_hyst_attrs[indx].name;
1203                tz->trip_hyst_attrs[indx].attr.attr.mode = S_IRUGO;
1204                tz->trip_hyst_attrs[indx].attr.show = trip_point_hyst_show;
1205                if (tz->ops->set_trip_hyst) {
1206                        tz->trip_hyst_attrs[indx].attr.attr.mode |= S_IWUSR;
1207                        tz->trip_hyst_attrs[indx].attr.store =
1208                                        trip_point_hyst_store;
1209                }
1210
1211                device_create_file(&tz->device,
1212                                   &tz->trip_hyst_attrs[indx].attr);
1213        }
1214        return 0;
1215}
1216
1217static void remove_trip_attrs(struct thermal_zone_device *tz)
1218{
1219        int indx;
1220
1221        for (indx = 0; indx < tz->trips; indx++) {
1222                device_remove_file(&tz->device,
1223                                   &tz->trip_type_attrs[indx].attr);
1224                device_remove_file(&tz->device,
1225                                   &tz->trip_temp_attrs[indx].attr);
1226                if (tz->ops->get_trip_hyst)
1227                        device_remove_file(&tz->device,
1228                                  &tz->trip_hyst_attrs[indx].attr);
1229        }
1230        kfree(tz->trip_type_attrs);
1231        kfree(tz->trip_temp_attrs);
1232        kfree(tz->trip_hyst_attrs);
1233}
1234
1235/**
1236 * thermal_zone_device_register - register a new thermal zone device
1237 * @type:       the thermal zone device type
1238 * @trips:      the number of trip points the thermal zone support
1239 * @mask:       a bit string indicating the writeablility of trip points
1240 * @devdata:    private device data
1241 * @ops:        standard thermal zone device callbacks
1242 * @tc1:        thermal coefficient 1 for passive calculations
1243 * @tc2:        thermal coefficient 2 for passive calculations
1244 * @passive_delay: number of milliseconds to wait between polls when
1245 *                 performing passive cooling
1246 * @polling_delay: number of milliseconds to wait between polls when checking
1247 *                 whether trip points have been crossed (0 for interrupt
1248 *                 driven systems)
1249 *
1250 * thermal_zone_device_unregister() must be called when the device is no
1251 * longer needed. The passive cooling formula uses tc1 and tc2 as described in
1252 * section 11.1.5.1 of the ACPI specification 3.0.
1253 */
1254struct thermal_zone_device *thermal_zone_device_register(const char *type,
1255        int trips, int mask, void *devdata,
1256        const struct thermal_zone_device_ops *ops,
1257        int tc1, int tc2, int passive_delay, int polling_delay)
1258{
1259        struct thermal_zone_device *tz;
1260        struct thermal_cooling_device *pos;
1261        enum thermal_trip_type trip_type;
1262        int result;
1263        int count;
1264        int passive = 0;
1265
1266        if (strlen(type) >= THERMAL_NAME_LENGTH)
1267                return ERR_PTR(-EINVAL);
1268
1269        if (trips > THERMAL_MAX_TRIPS || trips < 0 || mask >> trips)
1270                return ERR_PTR(-EINVAL);
1271
1272        if (!ops || !ops->get_temp)
1273                return ERR_PTR(-EINVAL);
1274
1275        tz = kzalloc(sizeof(struct thermal_zone_device), GFP_KERNEL);
1276        if (!tz)
1277                return ERR_PTR(-ENOMEM);
1278
1279        INIT_LIST_HEAD(&tz->cooling_devices);
1280        idr_init(&tz->idr);
1281        mutex_init(&tz->lock);
1282        result = get_idr(&thermal_tz_idr, &thermal_idr_lock, &tz->id);
1283        if (result) {
1284                kfree(tz);
1285                return ERR_PTR(result);
1286        }
1287
1288        strcpy(tz->type, type);
1289        tz->ops = ops;
1290        tz->device.class = &thermal_class;
1291        tz->devdata = devdata;
1292        tz->trips = trips;
1293        tz->tc1 = tc1;
1294        tz->tc2 = tc2;
1295        tz->passive_delay = passive_delay;
1296        tz->polling_delay = polling_delay;
1297
1298        dev_set_name(&tz->device, "thermal_zone%d", tz->id);
1299        result = device_register(&tz->device);
1300        if (result) {
1301                release_idr(&thermal_tz_idr, &thermal_idr_lock, tz->id);
1302                kfree(tz);
1303                return ERR_PTR(result);
1304        }
1305
1306        /* sys I/F */
1307        if (type) {
1308                result = device_create_file(&tz->device, &dev_attr_type);
1309                if (result)
1310                        goto unregister;
1311        }
1312
1313        result = device_create_file(&tz->device, &dev_attr_temp);
1314        if (result)
1315                goto unregister;
1316
1317        if (ops->get_mode) {
1318                result = device_create_file(&tz->device, &dev_attr_mode);
1319                if (result)
1320                        goto unregister;
1321        }
1322
1323        result = create_trip_attrs(tz, mask);
1324        if (result)
1325                goto unregister;
1326
1327        for (count = 0; count < trips; count++) {
1328                tz->ops->get_trip_type(tz, count, &trip_type);
1329                if (trip_type == THERMAL_TRIP_PASSIVE)
1330                        passive = 1;
1331        }
1332
1333        if (!passive)
1334                result = device_create_file(&tz->device,
1335                                            &dev_attr_passive);
1336
1337        if (result)
1338                goto unregister;
1339
1340        result = thermal_add_hwmon_sysfs(tz);
1341        if (result)
1342                goto unregister;
1343
1344        mutex_lock(&thermal_list_lock);
1345        list_add_tail(&tz->node, &thermal_tz_list);
1346        if (ops->bind)
1347                list_for_each_entry(pos, &thermal_cdev_list, node) {
1348                result = ops->bind(tz, pos);
1349                if (result)
1350                        break;
1351                }
1352        mutex_unlock(&thermal_list_lock);
1353
1354        INIT_DELAYED_WORK(&(tz->poll_queue), thermal_zone_device_check);
1355
1356        thermal_zone_device_update(tz);
1357
1358        if (!result)
1359                return tz;
1360
1361unregister:
1362        release_idr(&thermal_tz_idr, &thermal_idr_lock, tz->id);
1363        device_unregister(&tz->device);
1364        return ERR_PTR(result);
1365}
1366EXPORT_SYMBOL(thermal_zone_device_register);
1367
1368/**
1369 * thermal_device_unregister - removes the registered thermal zone device
1370 * @tz: the thermal zone device to remove
1371 */
1372void thermal_zone_device_unregister(struct thermal_zone_device *tz)
1373{
1374        struct thermal_cooling_device *cdev;
1375        struct thermal_zone_device *pos = NULL;
1376
1377        if (!tz)
1378                return;
1379
1380        mutex_lock(&thermal_list_lock);
1381        list_for_each_entry(pos, &thermal_tz_list, node)
1382            if (pos == tz)
1383                break;
1384        if (pos != tz) {
1385                /* thermal zone device not found */
1386                mutex_unlock(&thermal_list_lock);
1387                return;
1388        }
1389        list_del(&tz->node);
1390        if (tz->ops->unbind)
1391                list_for_each_entry(cdev, &thermal_cdev_list, node)
1392                    tz->ops->unbind(tz, cdev);
1393        mutex_unlock(&thermal_list_lock);
1394
1395        thermal_zone_device_set_polling(tz, 0);
1396
1397        if (tz->type[0])
1398                device_remove_file(&tz->device, &dev_attr_type);
1399        device_remove_file(&tz->device, &dev_attr_temp);
1400        if (tz->ops->get_mode)
1401                device_remove_file(&tz->device, &dev_attr_mode);
1402        remove_trip_attrs(tz);
1403
1404        thermal_remove_hwmon_sysfs(tz);
1405        release_idr(&thermal_tz_idr, &thermal_idr_lock, tz->id);
1406        idr_destroy(&tz->idr);
1407        mutex_destroy(&tz->lock);
1408        device_unregister(&tz->device);
1409        return;
1410}
1411EXPORT_SYMBOL(thermal_zone_device_unregister);
1412
1413#ifdef CONFIG_NET
1414static struct genl_family thermal_event_genl_family = {
1415        .id = GENL_ID_GENERATE,
1416        .name = THERMAL_GENL_FAMILY_NAME,
1417        .version = THERMAL_GENL_VERSION,
1418        .maxattr = THERMAL_GENL_ATTR_MAX,
1419};
1420
1421static struct genl_multicast_group thermal_event_mcgrp = {
1422        .name = THERMAL_GENL_MCAST_GROUP_NAME,
1423};
1424
1425int thermal_generate_netlink_event(u32 orig, enum events event)
1426{
1427        struct sk_buff *skb;
1428        struct nlattr *attr;
1429        struct thermal_genl_event *thermal_event;
1430        void *msg_header;
1431        int size;
1432        int result;
1433        static unsigned int thermal_event_seqnum;
1434
1435        /* allocate memory */
1436        size = nla_total_size(sizeof(struct thermal_genl_event)) +
1437               nla_total_size(0);
1438
1439        skb = genlmsg_new(size, GFP_ATOMIC);
1440        if (!skb)
1441                return -ENOMEM;
1442
1443        /* add the genetlink message header */
1444        msg_header = genlmsg_put(skb, 0, thermal_event_seqnum++,
1445                                 &thermal_event_genl_family, 0,
1446                                 THERMAL_GENL_CMD_EVENT);
1447        if (!msg_header) {
1448                nlmsg_free(skb);
1449                return -ENOMEM;
1450        }
1451
1452        /* fill the data */
1453        attr = nla_reserve(skb, THERMAL_GENL_ATTR_EVENT,
1454                           sizeof(struct thermal_genl_event));
1455
1456        if (!attr) {
1457                nlmsg_free(skb);
1458                return -EINVAL;
1459        }
1460
1461        thermal_event = nla_data(attr);
1462        if (!thermal_event) {
1463                nlmsg_free(skb);
1464                return -EINVAL;
1465        }
1466
1467        memset(thermal_event, 0, sizeof(struct thermal_genl_event));
1468
1469        thermal_event->orig = orig;
1470        thermal_event->event = event;
1471
1472        /* send multicast genetlink message */
1473        result = genlmsg_end(skb, msg_header);
1474        if (result < 0) {
1475                nlmsg_free(skb);
1476                return result;
1477        }
1478
1479        result = genlmsg_multicast(skb, 0, thermal_event_mcgrp.id, GFP_ATOMIC);
1480        if (result)
1481                pr_info("failed to send netlink event:%d\n", result);
1482
1483        return result;
1484}
1485EXPORT_SYMBOL(thermal_generate_netlink_event);
1486
1487static int genetlink_init(void)
1488{
1489        int result;
1490
1491        result = genl_register_family(&thermal_event_genl_family);
1492        if (result)
1493                return result;
1494
1495        result = genl_register_mc_group(&thermal_event_genl_family,
1496                                        &thermal_event_mcgrp);
1497        if (result)
1498                genl_unregister_family(&thermal_event_genl_family);
1499        return result;
1500}
1501
1502static void genetlink_exit(void)
1503{
1504        genl_unregister_family(&thermal_event_genl_family);
1505}
1506#else /* !CONFIG_NET */
1507static inline int genetlink_init(void) { return 0; }
1508static inline void genetlink_exit(void) {}
1509#endif /* !CONFIG_NET */
1510
1511static int __init thermal_init(void)
1512{
1513        int result = 0;
1514
1515        result = class_register(&thermal_class);
1516        if (result) {
1517                idr_destroy(&thermal_tz_idr);
1518                idr_destroy(&thermal_cdev_idr);
1519                mutex_destroy(&thermal_idr_lock);
1520                mutex_destroy(&thermal_list_lock);
1521        }
1522        result = genetlink_init();
1523        return result;
1524}
1525
1526static void __exit thermal_exit(void)
1527{
1528        class_unregister(&thermal_class);
1529        idr_destroy(&thermal_tz_idr);
1530        idr_destroy(&thermal_cdev_idr);
1531        mutex_destroy(&thermal_idr_lock);
1532        mutex_destroy(&thermal_list_lock);
1533        genetlink_exit();
1534}
1535
1536fs_initcall(thermal_init);
1537module_exit(thermal_exit);
1538
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