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
  91static int loading_timeout = 60;        /* In seconds */
  92
  93static inline long firmware_loading_timeout(void)
  94{
  95        return loading_timeout > 0 ? loading_timeout * HZ : MAX_SCHEDULE_TIMEOUT;
  96}
  97
  98struct firmware_cache {
  99        /* firmware_buf instance will be added into the below list */
 100        spinlock_t lock;
 101        struct list_head head;
 102        int state;
 103
 104#ifdef CONFIG_PM_SLEEP
 105        /*
 106         * Names of firmware images which have been cached successfully
 107         * will be added into the below list so that device uncache
 108         * helper can trace which firmware images have been cached
 109         * before.
 110         */
 111        spinlock_t name_lock;
 112        struct list_head fw_names;
 113
 114        struct delayed_work work;
 115
 116        struct notifier_block   pm_notify;
 117#endif
 118};
 119
 120struct firmware_buf {
 121        struct kref ref;
 122        struct list_head list;
 123        struct completion completion;
 124        struct firmware_cache *fwc;
 125        unsigned long status;
 126        void *data;
 127        size_t size;
 128#ifdef CONFIG_FW_LOADER_USER_HELPER
 129        bool is_paged_buf;
 130        struct page **pages;
 131        int nr_pages;
 132        int page_array_size;
 133#endif
 134        char fw_id[];
 135};
 136
 137struct fw_cache_entry {
 138        struct list_head list;
 139        char name[];
 140};
 141
 142struct fw_name_devm {
 143        unsigned long magic;
 144        char name[];
 145};
 146
 147#define to_fwbuf(d) container_of(d, struct firmware_buf, ref)
 148
 149#define FW_LOADER_NO_CACHE      0
 150#define FW_LOADER_START_CACHE   1
 151
 152static int fw_cache_piggyback_on_request(const char *name);
 153
 154/* fw_lock could be moved to 'struct firmware_priv' but since it is just
 155 * guarding for corner cases a global lock should be OK */
 156static DEFINE_MUTEX(fw_lock);
 157
 158static struct firmware_cache fw_cache;
 159
 160static struct firmware_buf *__allocate_fw_buf(const char *fw_name,
 161                                              struct firmware_cache *fwc)
 162{
 163        struct firmware_buf *buf;
 164
 165        buf = kzalloc(sizeof(*buf) + strlen(fw_name) + 1 , GFP_ATOMIC);
 166
 167        if (!buf)
 168                return buf;
 169
 170        kref_init(&buf->ref);
 171        strcpy(buf->fw_id, fw_name);
 172        buf->fwc = fwc;
 173        init_completion(&buf->completion);
 174
 175        pr_debug("%s: fw-%s buf=%p\n", __func__, fw_name, buf);
 176
 177        return buf;
 178}
 179
 180static struct firmware_buf *__fw_lookup_buf(const char *fw_name)
 181{
 182        struct firmware_buf *tmp;
 183        struct firmware_cache *fwc = &fw_cache;
 184
 185        list_for_each_entry(tmp, &fwc->head, list)
 186                if (!strcmp(tmp->fw_id, fw_name))
 187                        return tmp;
 188        return NULL;
 189}
 190
 191static int fw_lookup_and_allocate_buf(const char *fw_name,
 192                                      struct firmware_cache *fwc,
 193                                      struct firmware_buf **buf)
 194{
 195        struct firmware_buf *tmp;
 196
 197        spin_lock(&fwc->lock);
 198        tmp = __fw_lookup_buf(fw_name);
 199        if (tmp) {
 200                kref_get(&tmp->ref);
 201                spin_unlock(&fwc->lock);
 202                *buf = tmp;
 203                return 1;
 204        }
 205        tmp = __allocate_fw_buf(fw_name, fwc);
 206        if (tmp)
 207                list_add(&tmp->list, &fwc->head);
 208        spin_unlock(&fwc->lock);
 209
 210        *buf = tmp;
 211
 212        return tmp ? 0 : -ENOMEM;
 213}
 214
 215static struct firmware_buf *fw_lookup_buf(const char *fw_name)
 216{
 217        struct firmware_buf *tmp;
 218        struct firmware_cache *fwc = &fw_cache;
 219
 220        spin_lock(&fwc->lock);
 221        tmp = __fw_lookup_buf(fw_name);
 222        spin_unlock(&fwc->lock);
 223
 224        return tmp;
 225}
 226
 227static void __fw_free_buf(struct kref *ref)
 228{
 229        struct firmware_buf *buf = to_fwbuf(ref);
 230        struct firmware_cache *fwc = buf->fwc;
 231
 232        pr_debug("%s: fw-%s buf=%p data=%p size=%u\n",
 233                 __func__, buf->fw_id, buf, buf->data,
 234                 (unsigned int)buf->size);
 235
 236        list_del(&buf->list);
 237        spin_unlock(&fwc->lock);
 238
 239#ifdef CONFIG_FW_LOADER_USER_HELPER
 240        if (buf->is_paged_buf) {
 241                int i;
 242                vunmap(buf->data);
 243                for (i = 0; i < buf->nr_pages; i++)
 244                        __free_page(buf->pages[i]);
 245                kfree(buf->pages);
 246        } else
 247#endif
 248                vfree(buf->data);
 249        kfree(buf);
 250}
 251
 252static void fw_free_buf(struct firmware_buf *buf)
 253{
 254        struct firmware_cache *fwc = buf->fwc;
 255        spin_lock(&fwc->lock);
 256        if (!kref_put(&buf->ref, __fw_free_buf))
 257                spin_unlock(&fwc->lock);
 258}
 259
 260/* direct firmware loading support */
 261static char fw_path_para[256];
 262static const char * const fw_path[] = {
 263        fw_path_para,
 264        "/lib/firmware/updates/" UTS_RELEASE,
 265        "/lib/firmware/updates",
 266        "/lib/firmware/" UTS_RELEASE,
 267        "/lib/firmware"
 268};
 269
 270/*
 271 * Typical usage is that passing 'firmware_class.path=$CUSTOMIZED_PATH'
 272 * from kernel command line because firmware_class is generally built in
 273 * kernel instead of module.
 274 */
 275module_param_string(path, fw_path_para, sizeof(fw_path_para), 0644);
 276MODULE_PARM_DESC(path, "customized firmware image search path with a higher priority than default path");
 277
 278/* Don't inline this: 'struct kstat' is biggish */
 279static noinline_for_stack long fw_file_size(struct file *file)
 280{
 281        struct kstat st;
 282        if (vfs_getattr(&file->f_path, &st))
 283                return -1;
 284        if (!S_ISREG(st.mode))
 285                return -1;
 286        if (st.size != (long)st.size)
 287                return -1;
 288        return st.size;
 289}
 290
 291static bool fw_read_file_contents(struct file *file, struct firmware_buf *fw_buf)
 292{
 293        long size;
 294        char *buf;
 295
 296        size = fw_file_size(file);
 297        if (size <= 0)
 298                return false;
 299        buf = vmalloc(size);
 300        if (!buf)
 301                return false;
 302        if (kernel_read(file, 0, buf, size) != size) {
 303                vfree(buf);
 304                return false;
 305        }
 306        fw_buf->data = buf;
 307        fw_buf->size = size;
 308        return true;
 309}
 310
 311static bool fw_get_filesystem_firmware(struct device *device,
 312                                       struct firmware_buf *buf)
 313{
 314        int i;
 315        bool success = false;
 316        char *path = __getname();
 317
 318        for (i = 0; i < ARRAY_SIZE(fw_path); i++) {
 319                struct file *file;
 320
 321                /* skip the unset customized path */
 322                if (!fw_path[i][0])
 323                        continue;
 324
 325                snprintf(path, PATH_MAX, "%s/%s", fw_path[i], buf->fw_id);
 326
 327                file = filp_open(path, O_RDONLY, 0);
 328                if (IS_ERR(file))
 329                        continue;
 330                success = fw_read_file_contents(file, buf);
 331                fput(file);
 332                if (success)
 333                        break;
 334        }
 335        __putname(path);
 336
 337        if (success) {
 338                dev_dbg(device, "firmware: direct-loading firmware %s\n",
 339                        buf->fw_id);
 340                mutex_lock(&fw_lock);
 341                set_bit(FW_STATUS_DONE, &buf->status);
 342                complete_all(&buf->completion);
 343                mutex_unlock(&fw_lock);
 344        }
 345
 346        return success;
 347}
 348
 349/* firmware holds the ownership of pages */
 350static void firmware_free_data(const struct firmware *fw)
 351{
 352        /* Loaded directly? */
 353        if (!fw->priv) {
 354                vfree(fw->data);
 355                return;
 356        }
 357        fw_free_buf(fw->priv);
 358}
 359
 360/* store the pages buffer info firmware from buf */
 361static void fw_set_page_data(struct firmware_buf *buf, struct firmware *fw)
 362{
 363        fw->priv = buf;
 364#ifdef CONFIG_FW_LOADER_USER_HELPER
 365        fw->pages = buf->pages;
 366#endif
 367        fw->size = buf->size;
 368        fw->data = buf->data;
 369
 370        pr_debug("%s: fw-%s buf=%p data=%p size=%u\n",
 371                 __func__, buf->fw_id, buf, buf->data,
 372                 (unsigned int)buf->size);
 373}
 374
 375#ifdef CONFIG_PM_SLEEP
 376static void fw_name_devm_release(struct device *dev, void *res)
 377{
 378        struct fw_name_devm *fwn = res;
 379
 380        if (fwn->magic == (unsigned long)&fw_cache)
 381                pr_debug("%s: fw_name-%s devm-%p released\n",
 382                                __func__, fwn->name, res);
 383}
 384
 385static int fw_devm_match(struct device *dev, void *res,
 386                void *match_data)
 387{
 388        struct fw_name_devm *fwn = res;
 389
 390        return (fwn->magic == (unsigned long)&fw_cache) &&
 391                !strcmp(fwn->name, match_data);
 392}
 393
 394static struct fw_name_devm *fw_find_devm_name(struct device *dev,
 395                const char *name)
 396{
 397        struct fw_name_devm *fwn;
 398
 399        fwn = devres_find(dev, fw_name_devm_release,
 400                          fw_devm_match, (void *)name);
 401        return fwn;
 402}
 403
 404/* add firmware name into devres list */
 405static int fw_add_devm_name(struct device *dev, const char *name)
 406{
 407        struct fw_name_devm *fwn;
 408
 409        fwn = fw_find_devm_name(dev, name);
 410        if (fwn)
 411                return 1;
 412
 413        fwn = devres_alloc(fw_name_devm_release, sizeof(struct fw_name_devm) +
 414                           strlen(name) + 1, GFP_KERNEL);
 415        if (!fwn)
 416                return -ENOMEM;
 417
 418        fwn->magic = (unsigned long)&fw_cache;
 419        strcpy(fwn->name, name);
 420        devres_add(dev, fwn);
 421
 422        return 0;
 423}
 424#else
 425static int fw_add_devm_name(struct device *dev, const char *name)
 426{
 427        return 0;
 428}
 429#endif
 430
 431
 432/*
 433 * user-mode helper code
 434 */
 435#ifdef CONFIG_FW_LOADER_USER_HELPER
 436struct firmware_priv {
 437        struct delayed_work timeout_work;
 438        bool nowait;
 439        struct device dev;
 440        struct firmware_buf *buf;
 441        struct firmware *fw;
 442};
 443
 444static struct firmware_priv *to_firmware_priv(struct device *dev)
 445{
 446        return container_of(dev, struct firmware_priv, dev);
 447}
 448
 449static void fw_load_abort(struct firmware_priv *fw_priv)
 450{
 451        struct firmware_buf *buf = fw_priv->buf;
 452
 453        set_bit(FW_STATUS_ABORT, &buf->status);
 454        complete_all(&buf->completion);
 455}
 456
 457#define is_fw_load_aborted(buf) \
 458        test_bit(FW_STATUS_ABORT, &(buf)->status)
 459
 460static ssize_t firmware_timeout_show(struct class *class,
 461                                     struct class_attribute *attr,
 462                                     char *buf)
 463{
 464        return sprintf(buf, "%d\n", loading_timeout);
 465}
 466
 467/**
 468 * firmware_timeout_store - set number of seconds to wait for firmware
 469 * @class: device class pointer
 470 * @attr: device attribute pointer
 471 * @buf: buffer to scan for timeout value
 472 * @count: number of bytes in @buf
 473 *
 474 *      Sets the number of seconds to wait for the firmware.  Once
 475 *      this expires an error will be returned to the driver and no
 476 *      firmware will be provided.
 477 *
 478 *      Note: zero means 'wait forever'.
 479 **/
 480static ssize_t firmware_timeout_store(struct class *class,
 481                                      struct class_attribute *attr,
 482                                      const char *buf, size_t count)
 483{
 484        loading_timeout = simple_strtol(buf, NULL, 10);
 485        if (loading_timeout < 0)
 486                loading_timeout = 0;
 487
 488        return count;
 489}
 490
 491static struct class_attribute firmware_class_attrs[] = {
 492        __ATTR(timeout, S_IWUSR | S_IRUGO,
 493                firmware_timeout_show, firmware_timeout_store),
 494        __ATTR_NULL
 495};
 496
 497static void fw_dev_release(struct device *dev)
 498{
 499        struct firmware_priv *fw_priv = to_firmware_priv(dev);
 500
 501        kfree(fw_priv);
 502
 503        module_put(THIS_MODULE);
 504}
 505
 506static int firmware_uevent(struct device *dev, struct kobj_uevent_env *env)
 507{
 508        struct firmware_priv *fw_priv = to_firmware_priv(dev);
 509
 510        if (add_uevent_var(env, "FIRMWARE=%s", fw_priv->buf->fw_id))
 511                return -ENOMEM;
 512        if (add_uevent_var(env, "TIMEOUT=%i", loading_timeout))
 513                return -ENOMEM;
 514        if (add_uevent_var(env, "ASYNC=%d", fw_priv->nowait))
 515                return -ENOMEM;
 516
 517        return 0;
 518}
 519
 520static struct class firmware_class = {
 521        .name           = "firmware",
 522        .class_attrs    = firmware_class_attrs,
 523        .dev_uevent     = firmware_uevent,
 524        .dev_release    = fw_dev_release,
 525};
 526
 527static ssize_t firmware_loading_show(struct device *dev,
 528                                     struct device_attribute *attr, char *buf)
 529{
 530        struct firmware_priv *fw_priv = to_firmware_priv(dev);
 531        int loading = test_bit(FW_STATUS_LOADING, &fw_priv->buf->status);
 532
 533        return sprintf(buf, "%d\n", loading);
 534}
 535
 536/* Some architectures don't have PAGE_KERNEL_RO */
 537#ifndef PAGE_KERNEL_RO
 538#define PAGE_KERNEL_RO PAGE_KERNEL
 539#endif
 540
 541/* one pages buffer should be mapped/unmapped only once */
 542static int fw_map_pages_buf(struct firmware_buf *buf)
 543{
 544        if (!buf->is_paged_buf)
 545                return 0;
 546
 547        if (buf->data)
 548                vunmap(buf->data);
 549        buf->data = vmap(buf->pages, buf->nr_pages, 0, PAGE_KERNEL_RO);
 550        if (!buf->data)
 551                return -ENOMEM;
 552        return 0;
 553}
 554
 555/**
 556 * firmware_loading_store - set value in the 'loading' control file
 557 * @dev: device pointer
 558 * @attr: device attribute pointer
 559 * @buf: buffer to scan for loading control value
 560 * @count: number of bytes in @buf
 561 *
 562 *      The relevant values are:
 563 *
 564 *       1: Start a load, discarding any previous partial load.
 565 *       0: Conclude the load and hand the data to the driver code.
 566 *      -1: Conclude the load with an error and discard any written data.
 567 **/
 568static ssize_t firmware_loading_store(struct device *dev,
 569                                      struct device_attribute *attr,
 570                                      const char *buf, size_t count)
 571{
 572        struct firmware_priv *fw_priv = to_firmware_priv(dev);
 573        struct firmware_buf *fw_buf = fw_priv->buf;
 574        int loading = simple_strtol(buf, NULL, 10);
 575        int i;
 576
 577        mutex_lock(&fw_lock);
 578
 579        if (!fw_buf)
 580                goto out;
 581
 582        switch (loading) {
 583        case 1:
 584                /* discarding any previous partial load */
 585                if (!test_bit(FW_STATUS_DONE, &fw_buf->status)) {
 586                        for (i = 0; i < fw_buf->nr_pages; i++)
 587                                __free_page(fw_buf->pages[i]);
 588                        kfree(fw_buf->pages);
 589                        fw_buf->pages = NULL;
 590                        fw_buf->page_array_size = 0;
 591                        fw_buf->nr_pages = 0;
 592                        set_bit(FW_STATUS_LOADING, &fw_buf->status);
 593                }
 594                break;
 595        case 0:
 596                if (test_bit(FW_STATUS_LOADING, &fw_buf->status)) {
 597                        set_bit(FW_STATUS_DONE, &fw_buf->status);
 598                        clear_bit(FW_STATUS_LOADING, &fw_buf->status);
 599
 600                        /*
 601                         * Several loading requests may be pending on
 602                         * one same firmware buf, so let all requests
 603                         * see the mapped 'buf->data' once the loading
 604                         * is completed.
 605                         * */
 606                        fw_map_pages_buf(fw_buf);
 607                        complete_all(&fw_buf->completion);
 608                        break;
 609                }
 610                /* fallthrough */
 611        default:
 612                dev_err(dev, "%s: unexpected value (%d)\n", __func__, loading);
 613                /* fallthrough */
 614        case -1:
 615                fw_load_abort(fw_priv);
 616                break;
 617        }
 618out:
 619        mutex_unlock(&fw_lock);
 620        return count;
 621}
 622
 623static DEVICE_ATTR(loading, 0644, firmware_loading_show, firmware_loading_store);
 624
 625static ssize_t firmware_data_read(struct file *filp, struct kobject *kobj,
 626                                  struct bin_attribute *bin_attr,
 627                                  char *buffer, loff_t offset, size_t count)
 628{
 629        struct device *dev = kobj_to_dev(kobj);
 630        struct firmware_priv *fw_priv = to_firmware_priv(dev);
 631        struct firmware_buf *buf;
 632        ssize_t ret_count;
 633
 634        mutex_lock(&fw_lock);
 635        buf = fw_priv->buf;
 636        if (!buf || test_bit(FW_STATUS_DONE, &buf->status)) {
 637                ret_count = -ENODEV;
 638                goto out;
 639        }
 640        if (offset > buf->size) {
 641                ret_count = 0;
 642                goto out;
 643        }
 644        if (count > buf->size - offset)
 645                count = buf->size - offset;
 646
 647        ret_count = count;
 648
 649        while (count) {
 650                void *page_data;
 651                int page_nr = offset >> PAGE_SHIFT;
 652                int page_ofs = offset & (PAGE_SIZE-1);
 653                int page_cnt = min_t(size_t, PAGE_SIZE - page_ofs, count);
 654
 655                page_data = kmap(buf->pages[page_nr]);
 656
 657                memcpy(buffer, page_data + page_ofs, page_cnt);
 658
 659                kunmap(buf->pages[page_nr]);
 660                buffer += page_cnt;
 661                offset += page_cnt;
 662                count -= page_cnt;
 663        }
 664out:
 665        mutex_unlock(&fw_lock);
 666        return ret_count;
 667}
 668
 669static int fw_realloc_buffer(struct firmware_priv *fw_priv, int min_size)
 670{
 671        struct firmware_buf *buf = fw_priv->buf;
 672        int pages_needed = ALIGN(min_size, PAGE_SIZE) >> PAGE_SHIFT;
 673
 674        /* If the array of pages is too small, grow it... */
 675        if (buf->page_array_size < pages_needed) {
 676                int new_array_size = max(pages_needed,
 677                                         buf->page_array_size * 2);
 678                struct page **new_pages;
 679
 680                new_pages = kmalloc(new_array_size * sizeof(void *),
 681                                    GFP_KERNEL);
 682                if (!new_pages) {
 683                        fw_load_abort(fw_priv);
 684                        return -ENOMEM;
 685                }
 686                memcpy(new_pages, buf->pages,
 687                       buf->page_array_size * sizeof(void *));
 688                memset(&new_pages[buf->page_array_size], 0, sizeof(void *) *
 689                       (new_array_size - buf->page_array_size));
 690                kfree(buf->pages);
 691                buf->pages = new_pages;
 692                buf->page_array_size = new_array_size;
 693        }
 694
 695        while (buf->nr_pages < pages_needed) {
 696                buf->pages[buf->nr_pages] =
 697                        alloc_page(GFP_KERNEL | __GFP_HIGHMEM);
 698
 699                if (!buf->pages[buf->nr_pages]) {
 700                        fw_load_abort(fw_priv);
 701                        return -ENOMEM;
 702                }
 703                buf->nr_pages++;
 704        }
 705        return 0;
 706}
 707
 708/**
 709 * firmware_data_write - write method for firmware
 710 * @filp: open sysfs file
 711 * @kobj: kobject for the device
 712 * @bin_attr: bin_attr structure
 713 * @buffer: buffer being written
 714 * @offset: buffer offset for write in total data store area
 715 * @count: buffer size
 716 *
 717 *      Data written to the 'data' attribute will be later handed to
 718 *      the driver as a firmware image.
 719 **/
 720static ssize_t firmware_data_write(struct file *filp, struct kobject *kobj,
 721                                   struct bin_attribute *bin_attr,
 722                                   char *buffer, loff_t offset, size_t count)
 723{
 724        struct device *dev = kobj_to_dev(kobj);
 725        struct firmware_priv *fw_priv = to_firmware_priv(dev);
 726        struct firmware_buf *buf;
 727        ssize_t retval;
 728
 729        if (!capable(CAP_SYS_RAWIO))
 730                return -EPERM;
 731
 732        mutex_lock(&fw_lock);
 733        buf = fw_priv->buf;
 734        if (!buf || test_bit(FW_STATUS_DONE, &buf->status)) {
 735                retval = -ENODEV;
 736                goto out;
 737        }
 738
 739        retval = fw_realloc_buffer(fw_priv, offset + count);
 740        if (retval)
 741                goto out;
 742
 743        retval = count;
 744
 745        while (count) {
 746                void *page_data;
 747                int page_nr = offset >> PAGE_SHIFT;
 748                int page_ofs = offset & (PAGE_SIZE - 1);
 749                int page_cnt = min_t(size_t, PAGE_SIZE - page_ofs, count);
 750
 751                page_data = kmap(buf->pages[page_nr]);
 752
 753                memcpy(page_data + page_ofs, buffer, page_cnt);
 754
 755                kunmap(buf->pages[page_nr]);
 756                buffer += page_cnt;
 757                offset += page_cnt;
 758                count -= page_cnt;
 759        }
 760
 761        buf->size = max_t(size_t, offset, buf->size);
 762out:
 763        mutex_unlock(&fw_lock);
 764        return retval;
 765}
 766
 767static struct bin_attribute firmware_attr_data = {
 768        .attr = { .name = "data", .mode = 0644 },
 769        .size = 0,
 770        .read = firmware_data_read,
 771        .write = firmware_data_write,
 772};
 773
 774static void firmware_class_timeout_work(struct work_struct *work)
 775{
 776        struct firmware_priv *fw_priv = container_of(work,
 777                        struct firmware_priv, timeout_work.work);
 778
 779        mutex_lock(&fw_lock);
 780        if (test_bit(FW_STATUS_DONE, &(fw_priv->buf->status))) {
 781                mutex_unlock(&fw_lock);
 782                return;
 783        }
 784        fw_load_abort(fw_priv);
 785        mutex_unlock(&fw_lock);
 786}
 787
 788static struct firmware_priv *
 789fw_create_instance(struct firmware *firmware, const char *fw_name,
 790                   struct device *device, bool uevent, bool nowait)
 791{
 792        struct firmware_priv *fw_priv;
 793        struct device *f_dev;
 794
 795        fw_priv = kzalloc(sizeof(*fw_priv), GFP_KERNEL);
 796        if (!fw_priv) {
 797                dev_err(device, "%s: kmalloc failed\n", __func__);
 798                fw_priv = ERR_PTR(-ENOMEM);
 799                goto exit;
 800        }
 801
 802        fw_priv->nowait = nowait;
 803        fw_priv->fw = firmware;
 804        INIT_DELAYED_WORK(&fw_priv->timeout_work,
 805                firmware_class_timeout_work);
 806
 807        f_dev = &fw_priv->dev;
 808
 809        device_initialize(f_dev);
 810        dev_set_name(f_dev, "%s", fw_name);
 811        f_dev->parent = device;
 812        f_dev->class = &firmware_class;
 813exit:
 814        return fw_priv;
 815}
 816
 817/* load a firmware via user helper */
 818static int _request_firmware_load(struct firmware_priv *fw_priv, bool uevent,
 819                                  long timeout)
 820{
 821        int retval = 0;
 822        struct device *f_dev = &fw_priv->dev;
 823        struct firmware_buf *buf = fw_priv->buf;
 824
 825        /* fall back on userspace loading */
 826        buf->is_paged_buf = true;
 827
 828        dev_set_uevent_suppress(f_dev, true);
 829
 830        /* Need to pin this module until class device is destroyed */
 831        __module_get(THIS_MODULE);
 832
 833        retval = device_add(f_dev);
 834        if (retval) {
 835                dev_err(f_dev, "%s: device_register failed\n", __func__);
 836                goto err_put_dev;
 837        }
 838
 839        retval = device_create_bin_file(f_dev, &firmware_attr_data);
 840        if (retval) {
 841                dev_err(f_dev, "%s: sysfs_create_bin_file failed\n", __func__);
 842                goto err_del_dev;
 843        }
 844
 845        retval = device_create_file(f_dev, &dev_attr_loading);
 846        if (retval) {
 847                dev_err(f_dev, "%s: device_create_file failed\n", __func__);
 848                goto err_del_bin_attr;
 849        }
 850
 851        if (uevent) {
 852                dev_set_uevent_suppress(f_dev, false);
 853                dev_dbg(f_dev, "firmware: requesting %s\n", buf->fw_id);
 854                if (timeout != MAX_SCHEDULE_TIMEOUT)
 855                        schedule_delayed_work(&fw_priv->timeout_work, timeout);
 856
 857                kobject_uevent(&fw_priv->dev.kobj, KOBJ_ADD);
 858        }
 859
 860        wait_for_completion(&buf->completion);
 861
 862        cancel_delayed_work_sync(&fw_priv->timeout_work);
 863
 864        fw_priv->buf = NULL;
 865
 866        device_remove_file(f_dev, &dev_attr_loading);
 867err_del_bin_attr:
 868        device_remove_bin_file(f_dev, &firmware_attr_data);
 869err_del_dev:
 870        device_del(f_dev);
 871err_put_dev:
 872        put_device(f_dev);
 873        return retval;
 874}
 875
 876static int fw_load_from_user_helper(struct firmware *firmware,
 877                                    const char *name, struct device *device,
 878                                    bool uevent, bool nowait, long timeout)
 879{
 880        struct firmware_priv *fw_priv;
 881
 882        fw_priv = fw_create_instance(firmware, name, device, uevent, nowait);
 883        if (IS_ERR(fw_priv))
 884                return PTR_ERR(fw_priv);
 885
 886        fw_priv->buf = firmware->priv;
 887        return _request_firmware_load(fw_priv, uevent, timeout);
 888}
 889#else /* CONFIG_FW_LOADER_USER_HELPER */
 890static inline int
 891fw_load_from_user_helper(struct firmware *firmware, const char *name,
 892                         struct device *device, bool uevent, bool nowait,
 893                         long timeout)
 894{
 895        return -ENOENT;
 896}
 897
 898/* No abort during direct loading */
 899#define is_fw_load_aborted(buf) false
 900
 901#endif /* CONFIG_FW_LOADER_USER_HELPER */
 902
 903
 904/* wait until the shared firmware_buf becomes ready (or error) */
 905static int sync_cached_firmware_buf(struct firmware_buf *buf)
 906{
 907        int ret = 0;
 908
 909        mutex_lock(&fw_lock);
 910        while (!test_bit(FW_STATUS_DONE, &buf->status)) {
 911                if (is_fw_load_aborted(buf)) {
 912                        ret = -ENOENT;
 913                        break;
 914                }
 915                mutex_unlock(&fw_lock);
 916                wait_for_completion(&buf->completion);
 917                mutex_lock(&fw_lock);
 918        }
 919        mutex_unlock(&fw_lock);
 920        return ret;
 921}
 922
 923/* prepare firmware and firmware_buf structs;
 924 * return 0 if a firmware is already assigned, 1 if need to load one,
 925 * or a negative error code
 926 */
 927static int
 928_request_firmware_prepare(struct firmware **firmware_p, const char *name,
 929                          struct device *device)
 930{
 931        struct firmware *firmware;
 932        struct firmware_buf *buf;
 933        int ret;
 934
 935        *firmware_p = firmware = kzalloc(sizeof(*firmware), GFP_KERNEL);
 936        if (!firmware) {
 937                dev_err(device, "%s: kmalloc(struct firmware) failed\n",
 938                        __func__);
 939                return -ENOMEM;
 940        }
 941
 942        if (fw_get_builtin_firmware(firmware, name)) {
 943                dev_dbg(device, "firmware: using built-in firmware %s\n", name);
 944                return 0; /* assigned */
 945        }
 946
 947        ret = fw_lookup_and_allocate_buf(name, &fw_cache, &buf);
 948
 949        /*
 950         * bind with 'buf' now to avoid warning in failure path
 951         * of requesting firmware.
 952         */
 953        firmware->priv = buf;
 954
 955        if (ret > 0) {
 956                ret = sync_cached_firmware_buf(buf);
 957                if (!ret) {
 958                        fw_set_page_data(buf, firmware);
 959                        return 0; /* assigned */
 960                }
 961        }
 962
 963        if (ret < 0)
 964                return ret;
 965        return 1; /* need to load */
 966}
 967
 968static int assign_firmware_buf(struct firmware *fw, struct device *device)
 969{
 970        struct firmware_buf *buf = fw->priv;
 971
 972        mutex_lock(&fw_lock);
 973        if (!buf->size || is_fw_load_aborted(buf)) {
 974                mutex_unlock(&fw_lock);
 975                return -ENOENT;
 976        }
 977
 978        /*
 979         * add firmware name into devres list so that we can auto cache
 980         * and uncache firmware for device.
 981         *
 982         * device may has been deleted already, but the problem
 983         * should be fixed in devres or driver core.
 984         */
 985        if (device)
 986                fw_add_devm_name(device, buf->fw_id);
 987
 988        /*
 989         * After caching firmware image is started, let it piggyback
 990         * on request firmware.
 991         */
 992        if (buf->fwc->state == FW_LOADER_START_CACHE) {
 993                if (fw_cache_piggyback_on_request(buf->fw_id))
 994                        kref_get(&buf->ref);
 995        }
 996
 997        /* pass the pages buffer to driver at the last minute */
 998        fw_set_page_data(buf, fw);
 999        mutex_unlock(&fw_lock);
1000        return 0;
1001}
1002
1003/* called from request_firmware() and request_firmware_work_func() */
1004static int
1005_request_firmware(const struct firmware **firmware_p, const char *name,
1006                  struct device *device, bool uevent, bool nowait)
1007{
1008        struct firmware *fw;
1009        long timeout;
1010        int ret;
1011
1012        if (!firmware_p)
1013                return -EINVAL;
1014
1015        ret = _request_firmware_prepare(&fw, name, device);
1016        if (ret <= 0) /* error or already assigned */
1017                goto out;
1018
1019        ret = 0;
1020        timeout = firmware_loading_timeout();
1021        if (nowait) {
1022                timeout = usermodehelper_read_lock_wait(timeout);
1023                if (!timeout) {
1024                        dev_dbg(device, "firmware: %s loading timed out\n",
1025                                name);
1026                        ret = -EBUSY;
1027                        goto out;
1028                }
1029        } else {
1030                ret = usermodehelper_read_trylock();
1031                if (WARN_ON(ret)) {
1032                        dev_err(device, "firmware: %s will not be loaded\n",
1033                                name);
1034                        goto out;
1035                }
1036        }
1037
1038        if (!fw_get_filesystem_firmware(device, fw->priv))
1039                ret = fw_load_from_user_helper(fw, name, device,
1040                                               uevent, nowait, timeout);
1041        if (!ret)
1042                ret = assign_firmware_buf(fw, device);
1043
1044        usermodehelper_read_unlock();
1045
1046 out:
1047        if (ret < 0) {
1048                release_firmware(fw);
1049                fw = NULL;
1050        }
1051
1052        *firmware_p = fw;
1053        return ret;
1054}
1055
1056/**
1057 * request_firmware: - send firmware request and wait for it
1058 * @firmware_p: pointer to firmware image
1059 * @name: name of firmware file
1060 * @device: device for which firmware is being loaded
1061 *
1062 *      @firmware_p will be used to return a firmware image by the name
1063 *      of @name for device @device.
1064 *
1065 *      Should be called from user context where sleeping is allowed.
1066 *
1067 *      @name will be used as $FIRMWARE in the uevent environment and
1068 *      should be distinctive enough not to be confused with any other
1069 *      firmware image for this or any other device.
1070 *
1071 *      Caller must hold the reference count of @device.
1072 *
1073 *      The function can be called safely inside device's suspend and
1074 *      resume callback.
1075 **/
1076int
1077request_firmware(const struct firmware **firmware_p, const char *name,
1078                 struct device *device)
1079{
1080        return _request_firmware(firmware_p, name, device, true, false);
1081}
1082
1083/**
1084 * release_firmware: - release the resource associated with a firmware image
1085 * @fw: firmware resource to release
1086 **/
1087void release_firmware(const struct firmware *fw)
1088{
1089        if (fw) {
1090                if (!fw_is_builtin_firmware(fw))
1091                        firmware_free_data(fw);
1092                kfree(fw);
1093        }
1094}
1095
1096/* Async support */
1097struct firmware_work {
1098        struct work_struct work;
1099        struct module *module;
1100        const char *name;
1101        struct device *device;
1102        void *context;
1103        void (*cont)(const struct firmware *fw, void *context);
1104        bool uevent;
1105};
1106
1107static void request_firmware_work_func(struct work_struct *work)
1108{
1109        struct firmware_work *fw_work;
1110        const struct firmware *fw;
1111
1112        fw_work = container_of(work, struct firmware_work, work);
1113
1114        _request_firmware(&fw, fw_work->name, fw_work->device,
1115                          fw_work->uevent, true);
1116        fw_work->cont(fw, fw_work->context);
1117        put_device(fw_work->device); /* taken in request_firmware_nowait() */
1118
1119        module_put(fw_work->module);
1120        kfree(fw_work);
1121}
1122
1123/**
1124 * request_firmware_nowait - asynchronous version of request_firmware
1125 * @module: module requesting the firmware
1126 * @uevent: sends uevent to copy the firmware image if this flag
1127 *      is non-zero else the firmware copy must be done manually.
1128 * @name: name of firmware file
1129 * @device: device for which firmware is being loaded
1130 * @gfp: allocation flags
1131 * @context: will be passed over to @cont, and
1132 *      @fw may be %NULL if firmware request fails.
1133 * @cont: function will be called asynchronously when the firmware
1134 *      request is over.
1135 *
1136 *      Caller must hold the reference count of @device.
1137 *
1138 *      Asynchronous variant of request_firmware() for user contexts:
1139 *              - sleep for as small periods as possible since it may
1140 *              increase kernel boot time of built-in device drivers
1141 *              requesting firmware in their ->probe() methods, if
1142 *              @gfp is GFP_KERNEL.
1143 *
1144 *              - can't sleep at all if @gfp is GFP_ATOMIC.
1145 **/
1146int
1147request_firmware_nowait(
1148        struct module *module, bool uevent,
1149        const char *name, struct device *device, gfp_t gfp, void *context,
1150        void (*cont)(const struct firmware *fw, void *context))
1151{
1152        struct firmware_work *fw_work;
1153
1154        fw_work = kzalloc(sizeof (struct firmware_work), gfp);
1155        if (!fw_work)
1156                return -ENOMEM;
1157
1158        fw_work->module = module;
1159        fw_work->name = name;
1160        fw_work->device = device;
1161        fw_work->context = context;
1162        fw_work->cont = cont;
1163        fw_work->uevent = uevent;
1164
1165        if (!try_module_get(module)) {
1166                kfree(fw_work);
1167                return -EFAULT;
1168        }
1169
1170        get_device(fw_work->device);
1171        INIT_WORK(&fw_work->work, request_firmware_work_func);
1172        schedule_work(&fw_work->work);
1173        return 0;
1174}
1175
1176/**
1177 * cache_firmware - cache one firmware image in kernel memory space
1178 * @fw_name: the firmware image name
1179 *
1180 * Cache firmware in kernel memory so that drivers can use it when
1181 * system isn't ready for them to request firmware image from userspace.
1182 * Once it returns successfully, driver can use request_firmware or its
1183 * nowait version to get the cached firmware without any interacting
1184 * with userspace
1185 *
1186 * Return 0 if the firmware image has been cached successfully
1187 * Return !0 otherwise
1188 *
1189 */
1190int cache_firmware(const char *fw_name)
1191{
1192        int ret;
1193        const struct firmware *fw;
1194
1195        pr_debug("%s: %s\n", __func__, fw_name);
1196
1197        ret = request_firmware(&fw, fw_name, NULL);
1198        if (!ret)
1199                kfree(fw);
1200
1201        pr_debug("%s: %s ret=%d\n", __func__, fw_name, ret);
1202
1203        return ret;
1204}
1205
1206/**
1207 * uncache_firmware - remove one cached firmware image
1208 * @fw_name: the firmware image name
1209 *
1210 * Uncache one firmware image which has been cached successfully
1211 * before.
1212 *
1213 * Return 0 if the firmware cache has been removed successfully
1214 * Return !0 otherwise
1215 *
1216 */
1217int uncache_firmware(const char *fw_name)
1218{
1219        struct firmware_buf *buf;
1220        struct firmware fw;
1221
1222        pr_debug("%s: %s\n", __func__, fw_name);
1223
1224        if (fw_get_builtin_firmware(&fw, fw_name))
1225                return 0;
1226
1227        buf = fw_lookup_buf(fw_name);
1228        if (buf) {
1229                fw_free_buf(buf);
1230                return 0;
1231        }
1232
1233        return -EINVAL;
1234}
1235
1236#ifdef CONFIG_PM_SLEEP
1237static ASYNC_DOMAIN_EXCLUSIVE(fw_cache_domain);
1238
1239static struct fw_cache_entry *alloc_fw_cache_entry(const char *name)
1240{
1241        struct fw_cache_entry *fce;
1242
1243        fce = kzalloc(sizeof(*fce) + strlen(name) + 1, GFP_ATOMIC);
1244        if (!fce)
1245                goto exit;
1246
1247        strcpy(fce->name, name);
1248exit:
1249        return fce;
1250}
1251
1252static int __fw_entry_found(const char *name)
1253{
1254        struct firmware_cache *fwc = &fw_cache;
1255        struct fw_cache_entry *fce;
1256
1257        list_for_each_entry(fce, &fwc->fw_names, list) {
1258                if (!strcmp(fce->name, name))
1259                        return 1;
1260        }
1261        return 0;
1262}
1263
1264static int fw_cache_piggyback_on_request(const char *name)
1265{
1266        struct firmware_cache *fwc = &fw_cache;
1267        struct fw_cache_entry *fce;
1268        int ret = 0;
1269
1270        spin_lock(&fwc->name_lock);
1271        if (__fw_entry_found(name))
1272                goto found;
1273
1274        fce = alloc_fw_cache_entry(name);
1275        if (fce) {
1276                ret = 1;
1277                list_add(&fce->list, &fwc->fw_names);
1278                pr_debug("%s: fw: %s\n", __func__, name);
1279        }
1280found:
1281        spin_unlock(&fwc->name_lock);
1282        return ret;
1283}
1284
1285static void free_fw_cache_entry(struct fw_cache_entry *fce)
1286{
1287        kfree(fce);
1288}
1289
1290static void __async_dev_cache_fw_image(void *fw_entry,
1291                                       async_cookie_t cookie)
1292{
1293        struct fw_cache_entry *fce = fw_entry;
1294        struct firmware_cache *fwc = &fw_cache;
1295        int ret;
1296
1297        ret = cache_firmware(fce->name);
1298        if (ret) {
1299                spin_lock(&fwc->name_lock);
1300                list_del(&fce->list);
1301                spin_unlock(&fwc->name_lock);
1302
1303                free_fw_cache_entry(fce);
1304        }
1305}
1306
1307/* called with dev->devres_lock held */
1308static void dev_create_fw_entry(struct device *dev, void *res,
1309                                void *data)
1310{
1311        struct fw_name_devm *fwn = res;
1312        const char *fw_name = fwn->name;
1313        struct list_head *head = data;
1314        struct fw_cache_entry *fce;
1315
1316        fce = alloc_fw_cache_entry(fw_name);
1317        if (fce)
1318                list_add(&fce->list, head);
1319}
1320
1321static int devm_name_match(struct device *dev, void *res,
1322                           void *match_data)
1323{
1324        struct fw_name_devm *fwn = res;
1325        return (fwn->magic == (unsigned long)match_data);
1326}
1327
1328static void dev_cache_fw_image(struct device *dev, void *data)
1329{
1330        LIST_HEAD(todo);
1331        struct fw_cache_entry *fce;
1332        struct fw_cache_entry *fce_next;
1333        struct firmware_cache *fwc = &fw_cache;
1334
1335        devres_for_each_res(dev, fw_name_devm_release,
1336                            devm_name_match, &fw_cache,
1337                            dev_create_fw_entry, &todo);
1338
1339        list_for_each_entry_safe(fce, fce_next, &todo, list) {
1340                list_del(&fce->list);
1341
1342                spin_lock(&fwc->name_lock);
1343                /* only one cache entry for one firmware */
1344                if (!__fw_entry_found(fce->name)) {
1345                        list_add(&fce->list, &fwc->fw_names);
1346                } else {
1347                        free_fw_cache_entry(fce);
1348                        fce = NULL;
1349                }
1350                spin_unlock(&fwc->name_lock);
1351
1352                if (fce)
1353                        async_schedule_domain(__async_dev_cache_fw_image,
1354                                              (void *)fce,
1355                                              &fw_cache_domain);
1356        }
1357}
1358
1359static void __device_uncache_fw_images(void)
1360{
1361        struct firmware_cache *fwc = &fw_cache;
1362        struct fw_cache_entry *fce;
1363
1364        spin_lock(&fwc->name_lock);
1365        while (!list_empty(&fwc->fw_names)) {
1366                fce = list_entry(fwc->fw_names.next,
1367                                struct fw_cache_entry, list);
1368                list_del(&fce->list);
1369                spin_unlock(&fwc->name_lock);
1370
1371                uncache_firmware(fce->name);
1372                free_fw_cache_entry(fce);
1373
1374                spin_lock(&fwc->name_lock);
1375        }
1376        spin_unlock(&fwc->name_lock);
1377}
1378
1379/**
1380 * device_cache_fw_images - cache devices' firmware
1381 *
1382 * If one device called request_firmware or its nowait version
1383 * successfully before, the firmware names are recored into the
1384 * device's devres link list, so device_cache_fw_images can call
1385 * cache_firmware() to cache these firmwares for the device,
1386 * then the device driver can load its firmwares easily at
1387 * time when system is not ready to complete loading firmware.
1388 */
1389static void device_cache_fw_images(void)
1390{
1391        struct firmware_cache *fwc = &fw_cache;
1392        int old_timeout;
1393        DEFINE_WAIT(wait);
1394
1395        pr_debug("%s\n", __func__);
1396
1397        /* cancel uncache work */
1398        cancel_delayed_work_sync(&fwc->work);
1399
1400        /*
1401         * use small loading timeout for caching devices' firmware
1402         * because all these firmware images have been loaded
1403         * successfully at lease once, also system is ready for
1404         * completing firmware loading now. The maximum size of
1405         * firmware in current distributions is about 2M bytes,
1406         * so 10 secs should be enough.
1407         */
1408        old_timeout = loading_timeout;
1409        loading_timeout = 10;
1410
1411        mutex_lock(&fw_lock);
1412        fwc->state = FW_LOADER_START_CACHE;
1413        dpm_for_each_dev(NULL, dev_cache_fw_image);
1414        mutex_unlock(&fw_lock);
1415
1416        /* wait for completion of caching firmware for all devices */
1417        async_synchronize_full_domain(&fw_cache_domain);
1418
1419        loading_timeout = old_timeout;
1420}
1421
1422/**
1423 * device_uncache_fw_images - uncache devices' firmware
1424 *
1425 * uncache all firmwares which have been cached successfully
1426 * by device_uncache_fw_images earlier
1427 */
1428static void device_uncache_fw_images(void)
1429{
1430        pr_debug("%s\n", __func__);
1431        __device_uncache_fw_images();
1432}
1433
1434static void device_uncache_fw_images_work(struct work_struct *work)
1435{
1436        device_uncache_fw_images();
1437}
1438
1439/**
1440 * device_uncache_fw_images_delay - uncache devices firmwares
1441 * @delay: number of milliseconds to delay uncache device firmwares
1442 *
1443 * uncache all devices's firmwares which has been cached successfully
1444 * by device_cache_fw_images after @delay milliseconds.
1445 */
1446static void device_uncache_fw_images_delay(unsigned long delay)
1447{
1448        schedule_delayed_work(&fw_cache.work,
1449                        msecs_to_jiffies(delay));
1450}
1451
1452static int fw_pm_notify(struct notifier_block *notify_block,
1453                        unsigned long mode, void *unused)
1454{
1455        switch (mode) {
1456        case PM_HIBERNATION_PREPARE:
1457        case PM_SUSPEND_PREPARE:
1458                device_cache_fw_images();
1459                break;
1460
1461        case PM_POST_SUSPEND:
1462        case PM_POST_HIBERNATION:
1463        case PM_POST_RESTORE:
1464                /*
1465                 * In case that system sleep failed and syscore_suspend is
1466                 * not called.
1467                 */
1468                mutex_lock(&fw_lock);
1469                fw_cache.state = FW_LOADER_NO_CACHE;
1470                mutex_unlock(&fw_lock);
1471
1472                device_uncache_fw_images_delay(10 * MSEC_PER_SEC);
1473                break;
1474        }
1475
1476        return 0;
1477}
1478
1479/* stop caching firmware once syscore_suspend is reached */
1480static int fw_suspend(void)
1481{
1482        fw_cache.state = FW_LOADER_NO_CACHE;
1483        return 0;
1484}
1485
1486static struct syscore_ops fw_syscore_ops = {
1487        .suspend = fw_suspend,
1488};
1489#else
1490static int fw_cache_piggyback_on_request(const char *name)
1491{
1492        return 0;
1493}
1494#endif
1495
1496static void __init fw_cache_init(void)
1497{
1498        spin_lock_init(&fw_cache.lock);
1499        INIT_LIST_HEAD(&fw_cache.head);
1500        fw_cache.state = FW_LOADER_NO_CACHE;
1501
1502#ifdef CONFIG_PM_SLEEP
1503        spin_lock_init(&fw_cache.name_lock);
1504        INIT_LIST_HEAD(&fw_cache.fw_names);
1505
1506        INIT_DELAYED_WORK(&fw_cache.work,
1507                          device_uncache_fw_images_work);
1508
1509        fw_cache.pm_notify.notifier_call = fw_pm_notify;
1510        register_pm_notifier(&fw_cache.pm_notify);
1511
1512        register_syscore_ops(&fw_syscore_ops);
1513#endif
1514}
1515
1516static int __init firmware_class_init(void)
1517{
1518        fw_cache_init();
1519#ifdef CONFIG_FW_LOADER_USER_HELPER
1520        return class_register(&firmware_class);
1521#else
1522        return 0;
1523#endif
1524}
1525
1526static void __exit firmware_class_exit(void)
1527{
1528#ifdef CONFIG_PM_SLEEP
1529        unregister_syscore_ops(&fw_syscore_ops);
1530        unregister_pm_notifier(&fw_cache.pm_notify);
1531#endif
1532#ifdef CONFIG_FW_LOADER_USER_HELPER
1533        class_unregister(&firmware_class);
1534#endif
1535}
1536
1537fs_initcall(firmware_class_init);
1538module_exit(firmware_class_exit);
1539
1540EXPORT_SYMBOL(release_firmware);
1541EXPORT_SYMBOL(request_firmware);
1542EXPORT_SYMBOL(request_firmware_nowait);
1543EXPORT_SYMBOL_GPL(cache_firmware);
1544EXPORT_SYMBOL_GPL(uncache_firmware);
1545
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