linux/drivers/base/firmware_class.c
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   1/*
   2 * firmware_class.c - Multi purpose firmware loading support
   3 *
   4 * Copyright (c) 2003 Manuel Estrada Sainz
   5 *
   6 * Please see Documentation/firmware_class/ for more information.
   7 *
   8 */
   9
  10#include <linux/capability.h>
  11#include <linux/device.h>
  12#include <linux/module.h>
  13#include <linux/init.h>
  14#include <linux/timer.h>
  15#include <linux/vmalloc.h>
  16#include <linux/interrupt.h>
  17#include <linux/bitops.h>
  18#include <linux/mutex.h>
  19#include <linux/workqueue.h>
  20#include <linux/highmem.h>
  21#include <linux/firmware.h>
  22#include <linux/slab.h>
  23#include <linux/sched.h>
  24#include <linux/file.h>
  25#include <linux/list.h>
  26#include <linux/async.h>
  27#include <linux/pm.h>
  28#include <linux/suspend.h>
  29#include <linux/syscore_ops.h>
  30
  31#include <generated/utsrelease.h>
  32
  33#include "base.h"
  34
  35MODULE_AUTHOR("Manuel Estrada Sainz");
  36MODULE_DESCRIPTION("Multi purpose firmware loading support");
  37MODULE_LICENSE("GPL");
  38
  39/* Builtin firmware support */
  40
  41#ifdef CONFIG_FW_LOADER
  42
  43extern struct builtin_fw __start_builtin_fw[];
  44extern struct builtin_fw __end_builtin_fw[];
  45
  46static bool fw_get_builtin_firmware(struct firmware *fw, const char *name)
  47{
  48        struct builtin_fw *b_fw;
  49
  50        for (b_fw = __start_builtin_fw; b_fw != __end_builtin_fw; b_fw++) {
  51                if (strcmp(name, b_fw->name) == 0) {
  52                        fw->size = b_fw->size;
  53                        fw->data = b_fw->data;
  54                        return true;
  55                }
  56        }
  57
  58        return false;
  59}
  60
  61static bool fw_is_builtin_firmware(const struct firmware *fw)
  62{
  63        struct builtin_fw *b_fw;
  64
  65        for (b_fw = __start_builtin_fw; b_fw != __end_builtin_fw; b_fw++)
  66                if (fw->data == b_fw->data)
  67                        return true;
  68
  69        return false;
  70}
  71
  72#else /* Module case - no builtin firmware support */
  73
  74static inline bool fw_get_builtin_firmware(struct firmware *fw, const char *name)
  75{
  76        return false;
  77}
  78
  79static inline bool fw_is_builtin_firmware(const struct firmware *fw)
  80{
  81        return false;
  82}
  83#endif
  84
  85enum {
  86        FW_STATUS_LOADING,
  87        FW_STATUS_DONE,
  88        FW_STATUS_ABORT,
  89};
  90
  91enum fw_buf_fmt {
  92        VMALLOC_BUF,    /* used in direct loading */
  93        PAGE_BUF,       /* used in loading via userspace */
  94};
  95
  96static int loading_timeout = 60;        /* In seconds */
  97
  98static inline long firmware_loading_timeout(void)
  99{
 100        return loading_timeout > 0 ? loading_timeout * HZ : MAX_SCHEDULE_TIMEOUT;
 101}
 102
 103struct firmware_cache {
 104        /* firmware_buf instance will be added into the below list */
 105        spinlock_t lock;
 106        struct list_head head;
 107        int state;
 108
 109#ifdef CONFIG_PM_SLEEP
 110        /*
 111         * Names of firmware images which have been cached successfully
 112         * will be added into the below list so that device uncache
 113         * helper can trace which firmware images have been cached
 114         * before.
 115         */
 116        spinlock_t name_lock;
 117        struct list_head fw_names;
 118
 119        struct delayed_work work;
 120
 121        struct notifier_block   pm_notify;
 122#endif
 123};
 124
 125struct firmware_buf {
 126        struct kref ref;
 127        struct list_head list;
 128        struct completion completion;
 129        struct firmware_cache *fwc;
 130        unsigned long status;
 131        enum fw_buf_fmt fmt;
 132        void *data;
 133        size_t size;
 134        struct page **pages;
 135        int nr_pages;
 136        int page_array_size;
 137        char fw_id[];
 138};
 139
 140struct fw_cache_entry {
 141        struct list_head list;
 142        char name[];
 143};
 144
 145struct firmware_priv {
 146        struct delayed_work timeout_work;
 147        bool nowait;
 148        struct device dev;
 149        struct firmware_buf *buf;
 150        struct firmware *fw;
 151};
 152
 153struct fw_name_devm {
 154        unsigned long magic;
 155        char name[];
 156};
 157
 158#define to_fwbuf(d) container_of(d, struct firmware_buf, ref)
 159
 160#define FW_LOADER_NO_CACHE      0
 161#define FW_LOADER_START_CACHE   1
 162
 163static int fw_cache_piggyback_on_request(const char *name);
 164
 165/* fw_lock could be moved to 'struct firmware_priv' but since it is just
 166 * guarding for corner cases a global lock should be OK */
 167static DEFINE_MUTEX(fw_lock);
 168
 169static struct firmware_cache fw_cache;
 170
 171static struct firmware_buf *__allocate_fw_buf(const char *fw_name,
 172                                              struct firmware_cache *fwc)
 173{
 174        struct firmware_buf *buf;
 175
 176        buf = kzalloc(sizeof(*buf) + strlen(fw_name) + 1 , GFP_ATOMIC);
 177
 178        if (!buf)
 179                return buf;
 180
 181        kref_init(&buf->ref);
 182        strcpy(buf->fw_id, fw_name);
 183        buf->fwc = fwc;
 184        init_completion(&buf->completion);
 185        buf->fmt = VMALLOC_BUF;
 186
 187        pr_debug("%s: fw-%s buf=%p\n", __func__, fw_name, buf);
 188
 189        return buf;
 190}
 191
 192static struct firmware_buf *__fw_lookup_buf(const char *fw_name)
 193{
 194        struct firmware_buf *tmp;
 195        struct firmware_cache *fwc = &fw_cache;
 196
 197        list_for_each_entry(tmp, &fwc->head, list)
 198                if (!strcmp(tmp->fw_id, fw_name))
 199                        return tmp;
 200        return NULL;
 201}
 202
 203static int fw_lookup_and_allocate_buf(const char *fw_name,
 204                                      struct firmware_cache *fwc,
 205                                      struct firmware_buf **buf)
 206{
 207        struct firmware_buf *tmp;
 208
 209        spin_lock(&fwc->lock);
 210        tmp = __fw_lookup_buf(fw_name);
 211        if (tmp) {
 212                kref_get(&tmp->ref);
 213                spin_unlock(&fwc->lock);
 214                *buf = tmp;
 215                return 1;
 216        }
 217        tmp = __allocate_fw_buf(fw_name, fwc);
 218        if (tmp)
 219                list_add(&tmp->list, &fwc->head);
 220        spin_unlock(&fwc->lock);
 221
 222        *buf = tmp;
 223
 224        return tmp ? 0 : -ENOMEM;
 225}
 226
 227static struct firmware_buf *fw_lookup_buf(const char *fw_name)
 228{
 229        struct firmware_buf *tmp;
 230        struct firmware_cache *fwc = &fw_cache;
 231
 232        spin_lock(&fwc->lock);
 233        tmp = __fw_lookup_buf(fw_name);
 234        spin_unlock(&fwc->lock);
 235
 236        return tmp;
 237}
 238
 239static void __fw_free_buf(struct kref *ref)
 240{
 241        struct firmware_buf *buf = to_fwbuf(ref);
 242        struct firmware_cache *fwc = buf->fwc;
 243        int i;
 244
 245        pr_debug("%s: fw-%s buf=%p data=%p size=%u\n",
 246                 __func__, buf->fw_id, buf, buf->data,
 247                 (unsigned int)buf->size);
 248
 249        list_del(&buf->list);
 250        spin_unlock(&fwc->lock);
 251
 252
 253        if (buf->fmt == PAGE_BUF) {
 254                vunmap(buf->data);
 255                for (i = 0; i < buf->nr_pages; i++)
 256                        __free_page(buf->pages[i]);
 257                kfree(buf->pages);
 258        } else
 259                vfree(buf->data);
 260        kfree(buf);
 261}
 262
 263static void fw_free_buf(struct firmware_buf *buf)
 264{
 265        struct firmware_cache *fwc = buf->fwc;
 266        spin_lock(&fwc->lock);
 267        if (!kref_put(&buf->ref, __fw_free_buf))
 268                spin_unlock(&fwc->lock);
 269}
 270
 271/* direct firmware loading support */
 272static char fw_path_para[256];
 273static const char * const fw_path[] = {
 274        fw_path_para,
 275        "/lib/firmware/updates/" UTS_RELEASE,
 276        "/lib/firmware/updates",
 277        "/lib/firmware/" UTS_RELEASE,
 278        "/lib/firmware"
 279};
 280
 281/*
 282 * Typical usage is that passing 'firmware_class.path=$CUSTOMIZED_PATH'
 283 * from kernel command line because firmware_class is generally built in
 284 * kernel instead of module.
 285 */
 286module_param_string(path, fw_path_para, sizeof(fw_path_para), 0644);
 287MODULE_PARM_DESC(path, "customized firmware image search path with a higher priority than default path");
 288
 289/* Don't inline this: 'struct kstat' is biggish */
 290static noinline_for_stack long fw_file_size(struct file *file)
 291{
 292        struct kstat st;
 293        if (vfs_getattr(file->f_path.mnt, file->f_path.dentry, &st))
 294                return -1;
 295        if (!S_ISREG(st.mode))
 296                return -1;
 297        if (st.size != (long)st.size)
 298                return -1;
 299        return st.size;
 300}
 301
 302static bool fw_read_file_contents(struct file *file, struct firmware_buf *fw_buf)
 303{
 304        long size;
 305        char *buf;
 306
 307        size = fw_file_size(file);
 308        if (size <= 0)
 309                return false;
 310        buf = vmalloc(size);
 311        if (!buf)
 312                return false;
 313        if (kernel_read(file, 0, buf, size) != size) {
 314                vfree(buf);
 315                return false;
 316        }
 317        fw_buf->data = buf;
 318        fw_buf->size = size;
 319        return true;
 320}
 321
 322static bool fw_get_filesystem_firmware(struct firmware_buf *buf)
 323{
 324        int i;
 325        bool success = false;
 326        char *path = __getname();
 327
 328        for (i = 0; i < ARRAY_SIZE(fw_path); i++) {
 329                struct file *file;
 330
 331                /* skip the unset customized path */
 332                if (!fw_path[i][0])
 333                        continue;
 334
 335                snprintf(path, PATH_MAX, "%s/%s", fw_path[i], buf->fw_id);
 336
 337                file = filp_open(path, O_RDONLY, 0);
 338                if (IS_ERR(file))
 339                        continue;
 340                success = fw_read_file_contents(file, buf);
 341                fput(file);
 342                if (success)
 343                        break;
 344        }
 345        __putname(path);
 346        return success;
 347}
 348
 349static struct firmware_priv *to_firmware_priv(struct device *dev)
 350{
 351        return container_of(dev, struct firmware_priv, dev);
 352}
 353
 354static void fw_load_abort(struct firmware_priv *fw_priv)
 355{
 356        struct firmware_buf *buf = fw_priv->buf;
 357
 358        set_bit(FW_STATUS_ABORT, &buf->status);
 359        complete_all(&buf->completion);
 360}
 361
 362static ssize_t firmware_timeout_show(struct class *class,
 363                                     struct class_attribute *attr,
 364                                     char *buf)
 365{
 366        return sprintf(buf, "%d\n", loading_timeout);
 367}
 368
 369/**
 370 * firmware_timeout_store - set number of seconds to wait for firmware
 371 * @class: device class pointer
 372 * @attr: device attribute pointer
 373 * @buf: buffer to scan for timeout value
 374 * @count: number of bytes in @buf
 375 *
 376 *      Sets the number of seconds to wait for the firmware.  Once
 377 *      this expires an error will be returned to the driver and no
 378 *      firmware will be provided.
 379 *
 380 *      Note: zero means 'wait forever'.
 381 **/
 382static ssize_t firmware_timeout_store(struct class *class,
 383                                      struct class_attribute *attr,
 384                                      const char *buf, size_t count)
 385{
 386        loading_timeout = simple_strtol(buf, NULL, 10);
 387        if (loading_timeout < 0)
 388                loading_timeout = 0;
 389
 390        return count;
 391}
 392
 393static struct class_attribute firmware_class_attrs[] = {
 394        __ATTR(timeout, S_IWUSR | S_IRUGO,
 395                firmware_timeout_show, firmware_timeout_store),
 396        __ATTR_NULL
 397};
 398
 399static void fw_dev_release(struct device *dev)
 400{
 401        struct firmware_priv *fw_priv = to_firmware_priv(dev);
 402
 403        kfree(fw_priv);
 404
 405        module_put(THIS_MODULE);
 406}
 407
 408static int firmware_uevent(struct device *dev, struct kobj_uevent_env *env)
 409{
 410        struct firmware_priv *fw_priv = to_firmware_priv(dev);
 411
 412        if (add_uevent_var(env, "FIRMWARE=%s", fw_priv->buf->fw_id))
 413                return -ENOMEM;
 414        if (add_uevent_var(env, "TIMEOUT=%i", loading_timeout))
 415                return -ENOMEM;
 416        if (add_uevent_var(env, "ASYNC=%d", fw_priv->nowait))
 417                return -ENOMEM;
 418
 419        return 0;
 420}
 421
 422static struct class firmware_class = {
 423        .name           = "firmware",
 424        .class_attrs    = firmware_class_attrs,
 425        .dev_uevent     = firmware_uevent,
 426        .dev_release    = fw_dev_release,
 427};
 428
 429static ssize_t firmware_loading_show(struct device *dev,
 430                                     struct device_attribute *attr, char *buf)
 431{
 432        struct firmware_priv *fw_priv = to_firmware_priv(dev);
 433        int loading = test_bit(FW_STATUS_LOADING, &fw_priv->buf->status);
 434
 435        return sprintf(buf, "%d\n", loading);
 436}
 437
 438/* firmware holds the ownership of pages */
 439static void firmware_free_data(const struct firmware *fw)
 440{
 441        /* Loaded directly? */
 442        if (!fw->priv) {
 443                vfree(fw->data);
 444                return;
 445        }
 446        fw_free_buf(fw->priv);
 447}
 448
 449/* Some architectures don't have PAGE_KERNEL_RO */
 450#ifndef PAGE_KERNEL_RO
 451#define PAGE_KERNEL_RO PAGE_KERNEL
 452#endif
 453
 454/* one pages buffer should be mapped/unmapped only once */
 455static int fw_map_pages_buf(struct firmware_buf *buf)
 456{
 457        if (buf->fmt != PAGE_BUF)
 458                return 0;
 459
 460        if (buf->data)
 461                vunmap(buf->data);
 462        buf->data = vmap(buf->pages, buf->nr_pages, 0, PAGE_KERNEL_RO);
 463        if (!buf->data)
 464                return -ENOMEM;
 465        return 0;
 466}
 467
 468/**
 469 * firmware_loading_store - set value in the 'loading' control file
 470 * @dev: device pointer
 471 * @attr: device attribute pointer
 472 * @buf: buffer to scan for loading control value
 473 * @count: number of bytes in @buf
 474 *
 475 *      The relevant values are:
 476 *
 477 *       1: Start a load, discarding any previous partial load.
 478 *       0: Conclude the load and hand the data to the driver code.
 479 *      -1: Conclude the load with an error and discard any written data.
 480 **/
 481static ssize_t firmware_loading_store(struct device *dev,
 482                                      struct device_attribute *attr,
 483                                      const char *buf, size_t count)
 484{
 485        struct firmware_priv *fw_priv = to_firmware_priv(dev);
 486        struct firmware_buf *fw_buf = fw_priv->buf;
 487        int loading = simple_strtol(buf, NULL, 10);
 488        int i;
 489
 490        mutex_lock(&fw_lock);
 491
 492        if (!fw_buf)
 493                goto out;
 494
 495        switch (loading) {
 496        case 1:
 497                /* discarding any previous partial load */
 498                if (!test_bit(FW_STATUS_DONE, &fw_buf->status)) {
 499                        for (i = 0; i < fw_buf->nr_pages; i++)
 500                                __free_page(fw_buf->pages[i]);
 501                        kfree(fw_buf->pages);
 502                        fw_buf->pages = NULL;
 503                        fw_buf->page_array_size = 0;
 504                        fw_buf->nr_pages = 0;
 505                        set_bit(FW_STATUS_LOADING, &fw_buf->status);
 506                }
 507                break;
 508        case 0:
 509                if (test_bit(FW_STATUS_LOADING, &fw_buf->status)) {
 510                        set_bit(FW_STATUS_DONE, &fw_buf->status);
 511                        clear_bit(FW_STATUS_LOADING, &fw_buf->status);
 512
 513                        /*
 514                         * Several loading requests may be pending on
 515                         * one same firmware buf, so let all requests
 516                         * see the mapped 'buf->data' once the loading
 517                         * is completed.
 518                         * */
 519                        fw_map_pages_buf(fw_buf);
 520                        complete_all(&fw_buf->completion);
 521                        break;
 522                }
 523                /* fallthrough */
 524        default:
 525                dev_err(dev, "%s: unexpected value (%d)\n", __func__, loading);
 526                /* fallthrough */
 527        case -1:
 528                fw_load_abort(fw_priv);
 529                break;
 530        }
 531out:
 532        mutex_unlock(&fw_lock);
 533        return count;
 534}
 535
 536static DEVICE_ATTR(loading, 0644, firmware_loading_show, firmware_loading_store);
 537
 538static ssize_t firmware_data_read(struct file *filp, struct kobject *kobj,
 539                                  struct bin_attribute *bin_attr,
 540                                  char *buffer, loff_t offset, size_t count)
 541{
 542        struct device *dev = kobj_to_dev(kobj);
 543        struct firmware_priv *fw_priv = to_firmware_priv(dev);
 544        struct firmware_buf *buf;
 545        ssize_t ret_count;
 546
 547        mutex_lock(&fw_lock);
 548        buf = fw_priv->buf;
 549        if (!buf || test_bit(FW_STATUS_DONE, &buf->status)) {
 550                ret_count = -ENODEV;
 551                goto out;
 552        }
 553        if (offset > buf->size) {
 554                ret_count = 0;
 555                goto out;
 556        }
 557        if (count > buf->size - offset)
 558                count = buf->size - offset;
 559
 560        ret_count = count;
 561
 562        while (count) {
 563                void *page_data;
 564                int page_nr = offset >> PAGE_SHIFT;
 565                int page_ofs = offset & (PAGE_SIZE-1);
 566                int page_cnt = min_t(size_t, PAGE_SIZE - page_ofs, count);
 567
 568                page_data = kmap(buf->pages[page_nr]);
 569
 570                memcpy(buffer, page_data + page_ofs, page_cnt);
 571
 572                kunmap(buf->pages[page_nr]);
 573                buffer += page_cnt;
 574                offset += page_cnt;
 575                count -= page_cnt;
 576        }
 577out:
 578        mutex_unlock(&fw_lock);
 579        return ret_count;
 580}
 581
 582static int fw_realloc_buffer(struct firmware_priv *fw_priv, int min_size)
 583{
 584        struct firmware_buf *buf = fw_priv->buf;
 585        int pages_needed = ALIGN(min_size, PAGE_SIZE) >> PAGE_SHIFT;
 586
 587        /* If the array of pages is too small, grow it... */
 588        if (buf->page_array_size < pages_needed) {
 589                int new_array_size = max(pages_needed,
 590                                         buf->page_array_size * 2);
 591                struct page **new_pages;
 592
 593                new_pages = kmalloc(new_array_size * sizeof(void *),
 594                                    GFP_KERNEL);
 595                if (!new_pages) {
 596                        fw_load_abort(fw_priv);
 597                        return -ENOMEM;
 598                }
 599                memcpy(new_pages, buf->pages,
 600                       buf->page_array_size * sizeof(void *));
 601                memset(&new_pages[buf->page_array_size], 0, sizeof(void *) *
 602                       (new_array_size - buf->page_array_size));
 603                kfree(buf->pages);
 604                buf->pages = new_pages;
 605                buf->page_array_size = new_array_size;
 606        }
 607
 608        while (buf->nr_pages < pages_needed) {
 609                buf->pages[buf->nr_pages] =
 610                        alloc_page(GFP_KERNEL | __GFP_HIGHMEM);
 611
 612                if (!buf->pages[buf->nr_pages]) {
 613                        fw_load_abort(fw_priv);
 614                        return -ENOMEM;
 615                }
 616                buf->nr_pages++;
 617        }
 618        return 0;
 619}
 620
 621/**
 622 * firmware_data_write - write method for firmware
 623 * @filp: open sysfs file
 624 * @kobj: kobject for the device
 625 * @bin_attr: bin_attr structure
 626 * @buffer: buffer being written
 627 * @offset: buffer offset for write in total data store area
 628 * @count: buffer size
 629 *
 630 *      Data written to the 'data' attribute will be later handed to
 631 *      the driver as a firmware image.
 632 **/
 633static ssize_t firmware_data_write(struct file *filp, struct kobject *kobj,
 634                                   struct bin_attribute *bin_attr,
 635                                   char *buffer, loff_t offset, size_t count)
 636{
 637        struct device *dev = kobj_to_dev(kobj);
 638        struct firmware_priv *fw_priv = to_firmware_priv(dev);
 639        struct firmware_buf *buf;
 640        ssize_t retval;
 641
 642        if (!capable(CAP_SYS_RAWIO))
 643                return -EPERM;
 644
 645        mutex_lock(&fw_lock);
 646        buf = fw_priv->buf;
 647        if (!buf || test_bit(FW_STATUS_DONE, &buf->status)) {
 648                retval = -ENODEV;
 649                goto out;
 650        }
 651
 652        retval = fw_realloc_buffer(fw_priv, offset + count);
 653        if (retval)
 654                goto out;
 655
 656        retval = count;
 657
 658        while (count) {
 659                void *page_data;
 660                int page_nr = offset >> PAGE_SHIFT;
 661                int page_ofs = offset & (PAGE_SIZE - 1);
 662                int page_cnt = min_t(size_t, PAGE_SIZE - page_ofs, count);
 663
 664                page_data = kmap(buf->pages[page_nr]);
 665
 666                memcpy(page_data + page_ofs, buffer, page_cnt);
 667
 668                kunmap(buf->pages[page_nr]);
 669                buffer += page_cnt;
 670                offset += page_cnt;
 671                count -= page_cnt;
 672        }
 673
 674        buf->size = max_t(size_t, offset, buf->size);
 675out:
 676        mutex_unlock(&fw_lock);
 677        return retval;
 678}
 679
 680static struct bin_attribute firmware_attr_data = {
 681        .attr = { .name = "data", .mode = 0644 },
 682        .size = 0,
 683        .read = firmware_data_read,
 684        .write = firmware_data_write,
 685};
 686
 687static void firmware_class_timeout_work(struct work_struct *work)
 688{
 689        struct firmware_priv *fw_priv = container_of(work,
 690                        struct firmware_priv, timeout_work.work);
 691
 692        mutex_lock(&fw_lock);
 693        if (test_bit(FW_STATUS_DONE, &(fw_priv->buf->status))) {
 694                mutex_unlock(&fw_lock);
 695                return;
 696        }
 697        fw_load_abort(fw_priv);
 698        mutex_unlock(&fw_lock);
 699}
 700
 701static struct firmware_priv *
 702fw_create_instance(struct firmware *firmware, const char *fw_name,
 703                   struct device *device, bool uevent, bool nowait)
 704{
 705        struct firmware_priv *fw_priv;
 706        struct device *f_dev;
 707
 708        fw_priv = kzalloc(sizeof(*fw_priv), GFP_KERNEL);
 709        if (!fw_priv) {
 710                dev_err(device, "%s: kmalloc failed\n", __func__);
 711                fw_priv = ERR_PTR(-ENOMEM);
 712                goto exit;
 713        }
 714
 715        fw_priv->nowait = nowait;
 716        fw_priv->fw = firmware;
 717        INIT_DELAYED_WORK(&fw_priv->timeout_work,
 718                firmware_class_timeout_work);
 719
 720        f_dev = &fw_priv->dev;
 721
 722        device_initialize(f_dev);
 723        dev_set_name(f_dev, "%s", fw_name);
 724        f_dev->parent = device;
 725        f_dev->class = &firmware_class;
 726exit:
 727        return fw_priv;
 728}
 729
 730/* store the pages buffer info firmware from buf */
 731static void fw_set_page_data(struct firmware_buf *buf, struct firmware *fw)
 732{
 733        fw->priv = buf;
 734        fw->pages = buf->pages;
 735        fw->size = buf->size;
 736        fw->data = buf->data;
 737
 738        pr_debug("%s: fw-%s buf=%p data=%p size=%u\n",
 739                 __func__, buf->fw_id, buf, buf->data,
 740                 (unsigned int)buf->size);
 741}
 742
 743#ifdef CONFIG_PM_SLEEP
 744static void fw_name_devm_release(struct device *dev, void *res)
 745{
 746        struct fw_name_devm *fwn = res;
 747
 748        if (fwn->magic == (unsigned long)&fw_cache)
 749                pr_debug("%s: fw_name-%s devm-%p released\n",
 750                                __func__, fwn->name, res);
 751}
 752
 753static int fw_devm_match(struct device *dev, void *res,
 754                void *match_data)
 755{
 756        struct fw_name_devm *fwn = res;
 757
 758        return (fwn->magic == (unsigned long)&fw_cache) &&
 759                !strcmp(fwn->name, match_data);
 760}
 761
 762static struct fw_name_devm *fw_find_devm_name(struct device *dev,
 763                const char *name)
 764{
 765        struct fw_name_devm *fwn;
 766
 767        fwn = devres_find(dev, fw_name_devm_release,
 768                          fw_devm_match, (void *)name);
 769        return fwn;
 770}
 771
 772/* add firmware name into devres list */
 773static int fw_add_devm_name(struct device *dev, const char *name)
 774{
 775        struct fw_name_devm *fwn;
 776
 777        fwn = fw_find_devm_name(dev, name);
 778        if (fwn)
 779                return 1;
 780
 781        fwn = devres_alloc(fw_name_devm_release, sizeof(struct fw_name_devm) +
 782                           strlen(name) + 1, GFP_KERNEL);
 783        if (!fwn)
 784                return -ENOMEM;
 785
 786        fwn->magic = (unsigned long)&fw_cache;
 787        strcpy(fwn->name, name);
 788        devres_add(dev, fwn);
 789
 790        return 0;
 791}
 792#else
 793static int fw_add_devm_name(struct device *dev, const char *name)
 794{
 795        return 0;
 796}
 797#endif
 798
 799static void _request_firmware_cleanup(const struct firmware **firmware_p)
 800{
 801        release_firmware(*firmware_p);
 802        *firmware_p = NULL;
 803}
 804
 805static struct firmware_priv *
 806_request_firmware_prepare(const struct firmware **firmware_p, const char *name,
 807                          struct device *device, bool uevent, bool nowait)
 808{
 809        struct firmware *firmware;
 810        struct firmware_priv *fw_priv = NULL;
 811        struct firmware_buf *buf;
 812        int ret;
 813
 814        if (!firmware_p)
 815                return ERR_PTR(-EINVAL);
 816
 817        *firmware_p = firmware = kzalloc(sizeof(*firmware), GFP_KERNEL);
 818        if (!firmware) {
 819                dev_err(device, "%s: kmalloc(struct firmware) failed\n",
 820                        __func__);
 821                return ERR_PTR(-ENOMEM);
 822        }
 823
 824        if (fw_get_builtin_firmware(firmware, name)) {
 825                dev_dbg(device, "firmware: using built-in firmware %s\n", name);
 826                return NULL;
 827        }
 828
 829        ret = fw_lookup_and_allocate_buf(name, &fw_cache, &buf);
 830        if (!ret)
 831                fw_priv = fw_create_instance(firmware, name, device,
 832                                uevent, nowait);
 833
 834        if (IS_ERR(fw_priv) || ret < 0) {
 835                kfree(firmware);
 836                *firmware_p = NULL;
 837                return ERR_PTR(-ENOMEM);
 838        } else if (fw_priv) {
 839                fw_priv->buf = buf;
 840
 841                /*
 842                 * bind with 'buf' now to avoid warning in failure path
 843                 * of requesting firmware.
 844                 */
 845                firmware->priv = buf;
 846                return fw_priv;
 847        }
 848
 849        /* share the cached buf, which is inprogessing or completed */
 850 check_status:
 851        mutex_lock(&fw_lock);
 852        if (test_bit(FW_STATUS_ABORT, &buf->status)) {
 853                fw_priv = ERR_PTR(-ENOENT);
 854                firmware->priv = buf;
 855                _request_firmware_cleanup(firmware_p);
 856                goto exit;
 857        } else if (test_bit(FW_STATUS_DONE, &buf->status)) {
 858                fw_priv = NULL;
 859                fw_set_page_data(buf, firmware);
 860                goto exit;
 861        }
 862        mutex_unlock(&fw_lock);
 863        wait_for_completion(&buf->completion);
 864        goto check_status;
 865
 866exit:
 867        mutex_unlock(&fw_lock);
 868        return fw_priv;
 869}
 870
 871static int _request_firmware_load(struct firmware_priv *fw_priv, bool uevent,
 872                                  long timeout)
 873{
 874        int retval = 0;
 875        struct device *f_dev = &fw_priv->dev;
 876        struct firmware_buf *buf = fw_priv->buf;
 877        struct firmware_cache *fwc = &fw_cache;
 878        int direct_load = 0;
 879
 880        /* try direct loading from fs first */
 881        if (fw_get_filesystem_firmware(buf)) {
 882                dev_dbg(f_dev->parent, "firmware: direct-loading"
 883                        " firmware %s\n", buf->fw_id);
 884
 885                mutex_lock(&fw_lock);
 886                set_bit(FW_STATUS_DONE, &buf->status);
 887                mutex_unlock(&fw_lock);
 888                complete_all(&buf->completion);
 889                direct_load = 1;
 890                goto handle_fw;
 891        }
 892
 893        /* fall back on userspace loading */
 894        buf->fmt = PAGE_BUF;
 895
 896        dev_set_uevent_suppress(f_dev, true);
 897
 898        /* Need to pin this module until class device is destroyed */
 899        __module_get(THIS_MODULE);
 900
 901        retval = device_add(f_dev);
 902        if (retval) {
 903                dev_err(f_dev, "%s: device_register failed\n", __func__);
 904                goto err_put_dev;
 905        }
 906
 907        retval = device_create_bin_file(f_dev, &firmware_attr_data);
 908        if (retval) {
 909                dev_err(f_dev, "%s: sysfs_create_bin_file failed\n", __func__);
 910                goto err_del_dev;
 911        }
 912
 913        retval = device_create_file(f_dev, &dev_attr_loading);
 914        if (retval) {
 915                dev_err(f_dev, "%s: device_create_file failed\n", __func__);
 916                goto err_del_bin_attr;
 917        }
 918
 919        if (uevent) {
 920                dev_set_uevent_suppress(f_dev, false);
 921                dev_dbg(f_dev, "firmware: requesting %s\n", buf->fw_id);
 922                if (timeout != MAX_SCHEDULE_TIMEOUT)
 923                        schedule_delayed_work(&fw_priv->timeout_work, timeout);
 924
 925                kobject_uevent(&fw_priv->dev.kobj, KOBJ_ADD);
 926        }
 927
 928        wait_for_completion(&buf->completion);
 929
 930        cancel_delayed_work_sync(&fw_priv->timeout_work);
 931
 932handle_fw:
 933        mutex_lock(&fw_lock);
 934        if (!buf->size || test_bit(FW_STATUS_ABORT, &buf->status))
 935                retval = -ENOENT;
 936
 937        /*
 938         * add firmware name into devres list so that we can auto cache
 939         * and uncache firmware for device.
 940         *
 941         * f_dev->parent may has been deleted already, but the problem
 942         * should be fixed in devres or driver core.
 943         */
 944        if (!retval && f_dev->parent)
 945                fw_add_devm_name(f_dev->parent, buf->fw_id);
 946
 947        /*
 948         * After caching firmware image is started, let it piggyback
 949         * on request firmware.
 950         */
 951        if (!retval && fwc->state == FW_LOADER_START_CACHE) {
 952                if (fw_cache_piggyback_on_request(buf->fw_id))
 953                        kref_get(&buf->ref);
 954        }
 955
 956        /* pass the pages buffer to driver at the last minute */
 957        fw_set_page_data(buf, fw_priv->fw);
 958
 959        fw_priv->buf = NULL;
 960        mutex_unlock(&fw_lock);
 961
 962        if (direct_load)
 963                goto err_put_dev;
 964
 965        device_remove_file(f_dev, &dev_attr_loading);
 966err_del_bin_attr:
 967        device_remove_bin_file(f_dev, &firmware_attr_data);
 968err_del_dev:
 969        device_del(f_dev);
 970err_put_dev:
 971        put_device(f_dev);
 972        return retval;
 973}
 974
 975/**
 976 * request_firmware: - send firmware request and wait for it
 977 * @firmware_p: pointer to firmware image
 978 * @name: name of firmware file
 979 * @device: device for which firmware is being loaded
 980 *
 981 *      @firmware_p will be used to return a firmware image by the name
 982 *      of @name for device @device.
 983 *
 984 *      Should be called from user context where sleeping is allowed.
 985 *
 986 *      @name will be used as $FIRMWARE in the uevent environment and
 987 *      should be distinctive enough not to be confused with any other
 988 *      firmware image for this or any other device.
 989 *
 990 *      Caller must hold the reference count of @device.
 991 *
 992 *      The function can be called safely inside device's suspend and
 993 *      resume callback.
 994 **/
 995int
 996request_firmware(const struct firmware **firmware_p, const char *name,
 997                 struct device *device)
 998{
 999        struct firmware_priv *fw_priv;
1000        int ret;
1001
1002        fw_priv = _request_firmware_prepare(firmware_p, name, device, true,
1003                                            false);
1004        if (IS_ERR_OR_NULL(fw_priv))
1005                return PTR_RET(fw_priv);
1006
1007        ret = usermodehelper_read_trylock();
1008        if (WARN_ON(ret)) {
1009                dev_err(device, "firmware: %s will not be loaded\n", name);
1010        } else {
1011                ret = _request_firmware_load(fw_priv, true,
1012                                        firmware_loading_timeout());
1013                usermodehelper_read_unlock();
1014        }
1015        if (ret)
1016                _request_firmware_cleanup(firmware_p);
1017
1018        return ret;
1019}
1020
1021/**
1022 * release_firmware: - release the resource associated with a firmware image
1023 * @fw: firmware resource to release
1024 **/
1025void release_firmware(const struct firmware *fw)
1026{
1027        if (fw) {
1028                if (!fw_is_builtin_firmware(fw))
1029                        firmware_free_data(fw);
1030                kfree(fw);
1031        }
1032}
1033
1034/* Async support */
1035struct firmware_work {
1036        struct work_struct work;
1037        struct module *module;
1038        const char *name;
1039        struct device *device;
1040        void *context;
1041        void (*cont)(const struct firmware *fw, void *context);
1042        bool uevent;
1043};
1044
1045static void request_firmware_work_func(struct work_struct *work)
1046{
1047        struct firmware_work *fw_work;
1048        const struct firmware *fw;
1049        struct firmware_priv *fw_priv;
1050        long timeout;
1051        int ret;
1052
1053        fw_work = container_of(work, struct firmware_work, work);
1054        fw_priv = _request_firmware_prepare(&fw, fw_work->name, fw_work->device,
1055                        fw_work->uevent, true);
1056        if (IS_ERR_OR_NULL(fw_priv)) {
1057                ret = PTR_RET(fw_priv);
1058                goto out;
1059        }
1060
1061        timeout = usermodehelper_read_lock_wait(firmware_loading_timeout());
1062        if (timeout) {
1063                ret = _request_firmware_load(fw_priv, fw_work->uevent, timeout);
1064                usermodehelper_read_unlock();
1065        } else {
1066                dev_dbg(fw_work->device, "firmware: %s loading timed out\n",
1067                        fw_work->name);
1068                ret = -EAGAIN;
1069        }
1070        if (ret)
1071                _request_firmware_cleanup(&fw);
1072
1073 out:
1074        fw_work->cont(fw, fw_work->context);
1075        put_device(fw_work->device);
1076
1077        module_put(fw_work->module);
1078        kfree(fw_work);
1079}
1080
1081/**
1082 * request_firmware_nowait - asynchronous version of request_firmware
1083 * @module: module requesting the firmware
1084 * @uevent: sends uevent to copy the firmware image if this flag
1085 *      is non-zero else the firmware copy must be done manually.
1086 * @name: name of firmware file
1087 * @device: device for which firmware is being loaded
1088 * @gfp: allocation flags
1089 * @context: will be passed over to @cont, and
1090 *      @fw may be %NULL if firmware request fails.
1091 * @cont: function will be called asynchronously when the firmware
1092 *      request is over.
1093 *
1094 *      Caller must hold the reference count of @device.
1095 *
1096 *      Asynchronous variant of request_firmware() for user contexts:
1097 *              - sleep for as small periods as possible since it may
1098 *              increase kernel boot time of built-in device drivers
1099 *              requesting firmware in their ->probe() methods, if
1100 *              @gfp is GFP_KERNEL.
1101 *
1102 *              - can't sleep at all if @gfp is GFP_ATOMIC.
1103 **/
1104int
1105request_firmware_nowait(
1106        struct module *module, bool uevent,
1107        const char *name, struct device *device, gfp_t gfp, void *context,
1108        void (*cont)(const struct firmware *fw, void *context))
1109{
1110        struct firmware_work *fw_work;
1111
1112        fw_work = kzalloc(sizeof (struct firmware_work), gfp);
1113        if (!fw_work)
1114                return -ENOMEM;
1115
1116        fw_work->module = module;
1117        fw_work->name = name;
1118        fw_work->device = device;
1119        fw_work->context = context;
1120        fw_work->cont = cont;
1121        fw_work->uevent = uevent;
1122
1123        if (!try_module_get(module)) {
1124                kfree(fw_work);
1125                return -EFAULT;
1126        }
1127
1128        get_device(fw_work->device);
1129        INIT_WORK(&fw_work->work, request_firmware_work_func);
1130        schedule_work(&fw_work->work);
1131        return 0;
1132}
1133
1134/**
1135 * cache_firmware - cache one firmware image in kernel memory space
1136 * @fw_name: the firmware image name
1137 *
1138 * Cache firmware in kernel memory so that drivers can use it when
1139 * system isn't ready for them to request firmware image from userspace.
1140 * Once it returns successfully, driver can use request_firmware or its
1141 * nowait version to get the cached firmware without any interacting
1142 * with userspace
1143 *
1144 * Return 0 if the firmware image has been cached successfully
1145 * Return !0 otherwise
1146 *
1147 */
1148int cache_firmware(const char *fw_name)
1149{
1150        int ret;
1151        const struct firmware *fw;
1152
1153        pr_debug("%s: %s\n", __func__, fw_name);
1154
1155        ret = request_firmware(&fw, fw_name, NULL);
1156        if (!ret)
1157                kfree(fw);
1158
1159        pr_debug("%s: %s ret=%d\n", __func__, fw_name, ret);
1160
1161        return ret;
1162}
1163
1164/**
1165 * uncache_firmware - remove one cached firmware image
1166 * @fw_name: the firmware image name
1167 *
1168 * Uncache one firmware image which has been cached successfully
1169 * before.
1170 *
1171 * Return 0 if the firmware cache has been removed successfully
1172 * Return !0 otherwise
1173 *
1174 */
1175int uncache_firmware(const char *fw_name)
1176{
1177        struct firmware_buf *buf;
1178        struct firmware fw;
1179
1180        pr_debug("%s: %s\n", __func__, fw_name);
1181
1182        if (fw_get_builtin_firmware(&fw, fw_name))
1183                return 0;
1184
1185        buf = fw_lookup_buf(fw_name);
1186        if (buf) {
1187                fw_free_buf(buf);
1188                return 0;
1189        }
1190
1191        return -EINVAL;
1192}
1193
1194#ifdef CONFIG_PM_SLEEP
1195static ASYNC_DOMAIN_EXCLUSIVE(fw_cache_domain);
1196
1197static struct fw_cache_entry *alloc_fw_cache_entry(const char *name)
1198{
1199        struct fw_cache_entry *fce;
1200
1201        fce = kzalloc(sizeof(*fce) + strlen(name) + 1, GFP_ATOMIC);
1202        if (!fce)
1203                goto exit;
1204
1205        strcpy(fce->name, name);
1206exit:
1207        return fce;
1208}
1209
1210static int __fw_entry_found(const char *name)
1211{
1212        struct firmware_cache *fwc = &fw_cache;
1213        struct fw_cache_entry *fce;
1214
1215        list_for_each_entry(fce, &fwc->fw_names, list) {
1216                if (!strcmp(fce->name, name))
1217                        return 1;
1218        }
1219        return 0;
1220}
1221
1222static int fw_cache_piggyback_on_request(const char *name)
1223{
1224        struct firmware_cache *fwc = &fw_cache;
1225        struct fw_cache_entry *fce;
1226        int ret = 0;
1227
1228        spin_lock(&fwc->name_lock);
1229        if (__fw_entry_found(name))
1230                goto found;
1231
1232        fce = alloc_fw_cache_entry(name);
1233        if (fce) {
1234                ret = 1;
1235                list_add(&fce->list, &fwc->fw_names);
1236                pr_debug("%s: fw: %s\n", __func__, name);
1237        }
1238found:
1239        spin_unlock(&fwc->name_lock);
1240        return ret;
1241}
1242
1243static void free_fw_cache_entry(struct fw_cache_entry *fce)
1244{
1245        kfree(fce);
1246}
1247
1248static void __async_dev_cache_fw_image(void *fw_entry,
1249                                       async_cookie_t cookie)
1250{
1251        struct fw_cache_entry *fce = fw_entry;
1252        struct firmware_cache *fwc = &fw_cache;
1253        int ret;
1254
1255        ret = cache_firmware(fce->name);
1256        if (ret) {
1257                spin_lock(&fwc->name_lock);
1258                list_del(&fce->list);
1259                spin_unlock(&fwc->name_lock);
1260
1261                free_fw_cache_entry(fce);
1262        }
1263}
1264
1265/* called with dev->devres_lock held */
1266static void dev_create_fw_entry(struct device *dev, void *res,
1267                                void *data)
1268{
1269        struct fw_name_devm *fwn = res;
1270        const char *fw_name = fwn->name;
1271        struct list_head *head = data;
1272        struct fw_cache_entry *fce;
1273
1274        fce = alloc_fw_cache_entry(fw_name);
1275        if (fce)
1276                list_add(&fce->list, head);
1277}
1278
1279static int devm_name_match(struct device *dev, void *res,
1280                           void *match_data)
1281{
1282        struct fw_name_devm *fwn = res;
1283        return (fwn->magic == (unsigned long)match_data);
1284}
1285
1286static void dev_cache_fw_image(struct device *dev, void *data)
1287{
1288        LIST_HEAD(todo);
1289        struct fw_cache_entry *fce;
1290        struct fw_cache_entry *fce_next;
1291        struct firmware_cache *fwc = &fw_cache;
1292
1293        devres_for_each_res(dev, fw_name_devm_release,
1294                            devm_name_match, &fw_cache,
1295                            dev_create_fw_entry, &todo);
1296
1297        list_for_each_entry_safe(fce, fce_next, &todo, list) {
1298                list_del(&fce->list);
1299
1300                spin_lock(&fwc->name_lock);
1301                /* only one cache entry for one firmware */
1302                if (!__fw_entry_found(fce->name)) {
1303                        list_add(&fce->list, &fwc->fw_names);
1304                } else {
1305                        free_fw_cache_entry(fce);
1306                        fce = NULL;
1307                }
1308                spin_unlock(&fwc->name_lock);
1309
1310                if (fce)
1311                        async_schedule_domain(__async_dev_cache_fw_image,
1312                                              (void *)fce,
1313                                              &fw_cache_domain);
1314        }
1315}
1316
1317static void __device_uncache_fw_images(void)
1318{
1319        struct firmware_cache *fwc = &fw_cache;
1320        struct fw_cache_entry *fce;
1321
1322        spin_lock(&fwc->name_lock);
1323        while (!list_empty(&fwc->fw_names)) {
1324                fce = list_entry(fwc->fw_names.next,
1325                                struct fw_cache_entry, list);
1326                list_del(&fce->list);
1327                spin_unlock(&fwc->name_lock);
1328
1329                uncache_firmware(fce->name);
1330                free_fw_cache_entry(fce);
1331
1332                spin_lock(&fwc->name_lock);
1333        }
1334        spin_unlock(&fwc->name_lock);
1335}
1336
1337/**
1338 * device_cache_fw_images - cache devices' firmware
1339 *
1340 * If one device called request_firmware or its nowait version
1341 * successfully before, the firmware names are recored into the
1342 * device's devres link list, so device_cache_fw_images can call
1343 * cache_firmware() to cache these firmwares for the device,
1344 * then the device driver can load its firmwares easily at
1345 * time when system is not ready to complete loading firmware.
1346 */
1347static void device_cache_fw_images(void)
1348{
1349        struct firmware_cache *fwc = &fw_cache;
1350        int old_timeout;
1351        DEFINE_WAIT(wait);
1352
1353        pr_debug("%s\n", __func__);
1354
1355        /* cancel uncache work */
1356        cancel_delayed_work_sync(&fwc->work);
1357
1358        /*
1359         * use small loading timeout for caching devices' firmware
1360         * because all these firmware images have been loaded
1361         * successfully at lease once, also system is ready for
1362         * completing firmware loading now. The maximum size of
1363         * firmware in current distributions is about 2M bytes,
1364         * so 10 secs should be enough.
1365         */
1366        old_timeout = loading_timeout;
1367        loading_timeout = 10;
1368
1369        mutex_lock(&fw_lock);
1370        fwc->state = FW_LOADER_START_CACHE;
1371        dpm_for_each_dev(NULL, dev_cache_fw_image);
1372        mutex_unlock(&fw_lock);
1373
1374        /* wait for completion of caching firmware for all devices */
1375        async_synchronize_full_domain(&fw_cache_domain);
1376
1377        loading_timeout = old_timeout;
1378}
1379
1380/**
1381 * device_uncache_fw_images - uncache devices' firmware
1382 *
1383 * uncache all firmwares which have been cached successfully
1384 * by device_uncache_fw_images earlier
1385 */
1386static void device_uncache_fw_images(void)
1387{
1388        pr_debug("%s\n", __func__);
1389        __device_uncache_fw_images();
1390}
1391
1392static void device_uncache_fw_images_work(struct work_struct *work)
1393{
1394        device_uncache_fw_images();
1395}
1396
1397/**
1398 * device_uncache_fw_images_delay - uncache devices firmwares
1399 * @delay: number of milliseconds to delay uncache device firmwares
1400 *
1401 * uncache all devices's firmwares which has been cached successfully
1402 * by device_cache_fw_images after @delay milliseconds.
1403 */
1404static void device_uncache_fw_images_delay(unsigned long delay)
1405{
1406        schedule_delayed_work(&fw_cache.work,
1407                        msecs_to_jiffies(delay));
1408}
1409
1410static int fw_pm_notify(struct notifier_block *notify_block,
1411                        unsigned long mode, void *unused)
1412{
1413        switch (mode) {
1414        case PM_HIBERNATION_PREPARE:
1415        case PM_SUSPEND_PREPARE:
1416                device_cache_fw_images();
1417                break;
1418
1419        case PM_POST_SUSPEND:
1420        case PM_POST_HIBERNATION:
1421        case PM_POST_RESTORE:
1422                /*
1423                 * In case that system sleep failed and syscore_suspend is
1424                 * not called.
1425                 */
1426                mutex_lock(&fw_lock);
1427                fw_cache.state = FW_LOADER_NO_CACHE;
1428                mutex_unlock(&fw_lock);
1429
1430                device_uncache_fw_images_delay(10 * MSEC_PER_SEC);
1431                break;
1432        }
1433
1434        return 0;
1435}
1436
1437/* stop caching firmware once syscore_suspend is reached */
1438static int fw_suspend(void)
1439{
1440        fw_cache.state = FW_LOADER_NO_CACHE;
1441        return 0;
1442}
1443
1444static struct syscore_ops fw_syscore_ops = {
1445        .suspend = fw_suspend,
1446};
1447#else
1448static int fw_cache_piggyback_on_request(const char *name)
1449{
1450        return 0;
1451}
1452#endif
1453
1454static void __init fw_cache_init(void)
1455{
1456        spin_lock_init(&fw_cache.lock);
1457        INIT_LIST_HEAD(&fw_cache.head);
1458        fw_cache.state = FW_LOADER_NO_CACHE;
1459
1460#ifdef CONFIG_PM_SLEEP
1461        spin_lock_init(&fw_cache.name_lock);
1462        INIT_LIST_HEAD(&fw_cache.fw_names);
1463
1464        INIT_DELAYED_WORK(&fw_cache.work,
1465                          device_uncache_fw_images_work);
1466
1467        fw_cache.pm_notify.notifier_call = fw_pm_notify;
1468        register_pm_notifier(&fw_cache.pm_notify);
1469
1470        register_syscore_ops(&fw_syscore_ops);
1471#endif
1472}
1473
1474static int __init firmware_class_init(void)
1475{
1476        fw_cache_init();
1477        return class_register(&firmware_class);
1478}
1479
1480static void __exit firmware_class_exit(void)
1481{
1482#ifdef CONFIG_PM_SLEEP
1483        unregister_syscore_ops(&fw_syscore_ops);
1484        unregister_pm_notifier(&fw_cache.pm_notify);
1485#endif
1486        class_unregister(&firmware_class);
1487}
1488
1489fs_initcall(firmware_class_init);
1490module_exit(firmware_class_exit);
1491
1492EXPORT_SYMBOL(release_firmware);
1493EXPORT_SYMBOL(request_firmware);
1494EXPORT_SYMBOL(request_firmware_nowait);
1495EXPORT_SYMBOL_GPL(cache_firmware);
1496EXPORT_SYMBOL_GPL(uncache_firmware);
1497
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