2 * firmware_class.c - Multi purpose firmware loading support
4 * Copyright (c) 2003 Manuel Estrada Sainz
6 * Please see Documentation/firmware_class/ for more information.
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>
27 #include <linux/async.h>
29 #include <linux/suspend.h>
30 #include <linux/syscore_ops.h>
31 #include <linux/reboot.h>
32 #include <linux/security.h>
34 #include <generated/utsrelease.h>
38 MODULE_AUTHOR("Manuel Estrada Sainz");
39 MODULE_DESCRIPTION("Multi purpose firmware loading support");
40 MODULE_LICENSE("GPL");
42 /* Builtin firmware support */
44 #ifdef CONFIG_FW_LOADER
46 extern struct builtin_fw __start_builtin_fw[];
47 extern struct builtin_fw __end_builtin_fw[];
49 static bool fw_get_builtin_firmware(struct firmware *fw, const char *name,
50 void *buf, size_t size)
52 struct builtin_fw *b_fw;
54 for (b_fw = __start_builtin_fw; b_fw != __end_builtin_fw; b_fw++) {
55 if (strcmp(name, b_fw->name) == 0) {
56 fw->size = b_fw->size;
57 fw->data = b_fw->data;
59 if (buf && fw->size <= size)
60 memcpy(buf, fw->data, fw->size);
68 static bool fw_is_builtin_firmware(const struct firmware *fw)
70 struct builtin_fw *b_fw;
72 for (b_fw = __start_builtin_fw; b_fw != __end_builtin_fw; b_fw++)
73 if (fw->data == b_fw->data)
79 #else /* Module case - no builtin firmware support */
81 static inline bool fw_get_builtin_firmware(struct firmware *fw,
82 const char *name, void *buf,
88 static inline bool fw_is_builtin_firmware(const struct firmware *fw)
101 static int loading_timeout = 60; /* In seconds */
103 static inline long firmware_loading_timeout(void)
105 return loading_timeout > 0 ? loading_timeout * HZ : MAX_JIFFY_OFFSET;
109 * Concurrent request_firmware() for the same firmware need to be
110 * serialized. struct fw_state is simple state machine which hold the
111 * state of the firmware loading.
114 struct completion completion;
115 enum fw_status status;
118 static void fw_state_init(struct fw_state *fw_st)
120 init_completion(&fw_st->completion);
121 fw_st->status = FW_STATUS_UNKNOWN;
124 static inline bool __fw_state_is_done(enum fw_status status)
126 return status == FW_STATUS_DONE || status == FW_STATUS_ABORTED;
129 static int __fw_state_wait_common(struct fw_state *fw_st, long timeout)
133 ret = wait_for_completion_killable_timeout(&fw_st->completion, timeout);
134 if (ret != 0 && fw_st->status == FW_STATUS_ABORTED)
139 return ret < 0 ? ret : 0;
142 static void __fw_state_set(struct fw_state *fw_st,
143 enum fw_status status)
145 WRITE_ONCE(fw_st->status, status);
147 if (status == FW_STATUS_DONE || status == FW_STATUS_ABORTED)
148 complete_all(&fw_st->completion);
151 #define fw_state_start(fw_st) \
152 __fw_state_set(fw_st, FW_STATUS_LOADING)
153 #define fw_state_done(fw_st) \
154 __fw_state_set(fw_st, FW_STATUS_DONE)
155 #define fw_state_aborted(fw_st) \
156 __fw_state_set(fw_st, FW_STATUS_ABORTED)
157 #define fw_state_wait(fw_st) \
158 __fw_state_wait_common(fw_st, MAX_SCHEDULE_TIMEOUT)
160 static int __fw_state_check(struct fw_state *fw_st, enum fw_status status)
162 return fw_st->status == status;
165 #define fw_state_is_aborted(fw_st) \
166 __fw_state_check(fw_st, FW_STATUS_ABORTED)
168 #ifdef CONFIG_FW_LOADER_USER_HELPER
170 #define fw_state_aborted(fw_st) \
171 __fw_state_set(fw_st, FW_STATUS_ABORTED)
172 #define fw_state_is_done(fw_st) \
173 __fw_state_check(fw_st, FW_STATUS_DONE)
174 #define fw_state_is_loading(fw_st) \
175 __fw_state_check(fw_st, FW_STATUS_LOADING)
176 #define fw_state_wait_timeout(fw_st, timeout) \
177 __fw_state_wait_common(fw_st, timeout)
179 #endif /* CONFIG_FW_LOADER_USER_HELPER */
181 /* firmware behavior options */
182 #define FW_OPT_UEVENT (1U << 0)
183 #define FW_OPT_NOWAIT (1U << 1)
184 #ifdef CONFIG_FW_LOADER_USER_HELPER
185 #define FW_OPT_USERHELPER (1U << 2)
187 #define FW_OPT_USERHELPER 0
189 #ifdef CONFIG_FW_LOADER_USER_HELPER_FALLBACK
190 #define FW_OPT_FALLBACK FW_OPT_USERHELPER
192 #define FW_OPT_FALLBACK 0
194 #define FW_OPT_NO_WARN (1U << 3)
195 #define FW_OPT_NOCACHE (1U << 4)
197 struct firmware_cache {
198 /* firmware_buf instance will be added into the below list */
200 struct list_head head;
203 #ifdef CONFIG_PM_SLEEP
205 * Names of firmware images which have been cached successfully
206 * will be added into the below list so that device uncache
207 * helper can trace which firmware images have been cached
210 spinlock_t name_lock;
211 struct list_head fw_names;
213 struct delayed_work work;
215 struct notifier_block pm_notify;
219 struct firmware_buf {
221 struct list_head list;
222 struct firmware_cache *fwc;
223 struct fw_state fw_st;
226 size_t allocated_size;
227 #ifdef CONFIG_FW_LOADER_USER_HELPER
233 struct list_head pending_list;
238 struct fw_cache_entry {
239 struct list_head list;
243 struct fw_name_devm {
248 #define to_fwbuf(d) container_of(d, struct firmware_buf, ref)
250 #define FW_LOADER_NO_CACHE 0
251 #define FW_LOADER_START_CACHE 1
253 static int fw_cache_piggyback_on_request(const char *name);
255 /* fw_lock could be moved to 'struct firmware_priv' but since it is just
256 * guarding for corner cases a global lock should be OK */
257 static DEFINE_MUTEX(fw_lock);
259 static bool __enable_firmware = false;
261 static void enable_firmware(void)
263 mutex_lock(&fw_lock);
264 __enable_firmware = true;
265 mutex_unlock(&fw_lock);
268 static void disable_firmware(void)
270 mutex_lock(&fw_lock);
271 __enable_firmware = false;
272 mutex_unlock(&fw_lock);
276 * When disabled only the built-in firmware and the firmware cache will be
277 * used to look for firmware.
279 static bool firmware_enabled(void)
281 bool enabled = false;
283 mutex_lock(&fw_lock);
284 if (__enable_firmware)
286 mutex_unlock(&fw_lock);
291 static struct firmware_cache fw_cache;
293 static struct firmware_buf *__allocate_fw_buf(const char *fw_name,
294 struct firmware_cache *fwc,
295 void *dbuf, size_t size)
297 struct firmware_buf *buf;
299 buf = kzalloc(sizeof(*buf), GFP_ATOMIC);
303 buf->fw_id = kstrdup_const(fw_name, GFP_ATOMIC);
309 kref_init(&buf->ref);
312 buf->allocated_size = size;
313 fw_state_init(&buf->fw_st);
314 #ifdef CONFIG_FW_LOADER_USER_HELPER
315 INIT_LIST_HEAD(&buf->pending_list);
318 pr_debug("%s: fw-%s buf=%p\n", __func__, fw_name, buf);
323 static struct firmware_buf *__fw_lookup_buf(const char *fw_name)
325 struct firmware_buf *tmp;
326 struct firmware_cache *fwc = &fw_cache;
328 list_for_each_entry(tmp, &fwc->head, list)
329 if (!strcmp(tmp->fw_id, fw_name))
334 static int fw_lookup_and_allocate_buf(const char *fw_name,
335 struct firmware_cache *fwc,
336 struct firmware_buf **buf, void *dbuf,
339 struct firmware_buf *tmp;
341 spin_lock(&fwc->lock);
342 tmp = __fw_lookup_buf(fw_name);
345 spin_unlock(&fwc->lock);
349 tmp = __allocate_fw_buf(fw_name, fwc, dbuf, size);
351 list_add(&tmp->list, &fwc->head);
352 spin_unlock(&fwc->lock);
356 return tmp ? 0 : -ENOMEM;
359 static void __fw_free_buf(struct kref *ref)
360 __releases(&fwc->lock)
362 struct firmware_buf *buf = to_fwbuf(ref);
363 struct firmware_cache *fwc = buf->fwc;
365 pr_debug("%s: fw-%s buf=%p data=%p size=%u\n",
366 __func__, buf->fw_id, buf, buf->data,
367 (unsigned int)buf->size);
369 list_del(&buf->list);
370 spin_unlock(&fwc->lock);
372 #ifdef CONFIG_FW_LOADER_USER_HELPER
373 if (buf->is_paged_buf) {
376 for (i = 0; i < buf->nr_pages; i++)
377 __free_page(buf->pages[i]);
381 if (!buf->allocated_size)
383 kfree_const(buf->fw_id);
387 static void fw_free_buf(struct firmware_buf *buf)
389 struct firmware_cache *fwc = buf->fwc;
390 spin_lock(&fwc->lock);
391 if (!kref_put(&buf->ref, __fw_free_buf))
392 spin_unlock(&fwc->lock);
395 /* direct firmware loading support */
396 static char fw_path_para[256];
397 static const char * const fw_path[] = {
399 "/lib/firmware/updates/" UTS_RELEASE,
400 "/lib/firmware/updates",
401 "/lib/firmware/" UTS_RELEASE,
406 * Typical usage is that passing 'firmware_class.path=$CUSTOMIZED_PATH'
407 * from kernel command line because firmware_class is generally built in
408 * kernel instead of module.
410 module_param_string(path, fw_path_para, sizeof(fw_path_para), 0644);
411 MODULE_PARM_DESC(path, "customized firmware image search path with a higher priority than default path");
414 fw_get_filesystem_firmware(struct device *device, struct firmware_buf *buf)
420 enum kernel_read_file_id id = READING_FIRMWARE;
421 size_t msize = INT_MAX;
423 /* Already populated data member means we're loading into a buffer */
425 id = READING_FIRMWARE_PREALLOC_BUFFER;
426 msize = buf->allocated_size;
433 for (i = 0; i < ARRAY_SIZE(fw_path); i++) {
434 /* skip the unset customized path */
438 len = snprintf(path, PATH_MAX, "%s/%s",
439 fw_path[i], buf->fw_id);
440 if (len >= PATH_MAX) {
446 rc = kernel_read_file_from_path(path, &buf->data, &size, msize,
450 dev_dbg(device, "loading %s failed with error %d\n",
453 dev_warn(device, "loading %s failed with error %d\n",
457 dev_dbg(device, "direct-loading %s\n", buf->fw_id);
459 fw_state_done(&buf->fw_st);
467 /* firmware holds the ownership of pages */
468 static void firmware_free_data(const struct firmware *fw)
470 /* Loaded directly? */
475 fw_free_buf(fw->priv);
478 /* store the pages buffer info firmware from buf */
479 static void fw_set_page_data(struct firmware_buf *buf, struct firmware *fw)
482 #ifdef CONFIG_FW_LOADER_USER_HELPER
483 fw->pages = buf->pages;
485 fw->size = buf->size;
486 fw->data = buf->data;
488 pr_debug("%s: fw-%s buf=%p data=%p size=%u\n",
489 __func__, buf->fw_id, buf, buf->data,
490 (unsigned int)buf->size);
493 #ifdef CONFIG_PM_SLEEP
494 static void fw_name_devm_release(struct device *dev, void *res)
496 struct fw_name_devm *fwn = res;
498 if (fwn->magic == (unsigned long)&fw_cache)
499 pr_debug("%s: fw_name-%s devm-%p released\n",
500 __func__, fwn->name, res);
501 kfree_const(fwn->name);
504 static int fw_devm_match(struct device *dev, void *res,
507 struct fw_name_devm *fwn = res;
509 return (fwn->magic == (unsigned long)&fw_cache) &&
510 !strcmp(fwn->name, match_data);
513 static struct fw_name_devm *fw_find_devm_name(struct device *dev,
516 struct fw_name_devm *fwn;
518 fwn = devres_find(dev, fw_name_devm_release,
519 fw_devm_match, (void *)name);
523 /* add firmware name into devres list */
524 static int fw_add_devm_name(struct device *dev, const char *name)
526 struct fw_name_devm *fwn;
528 fwn = fw_find_devm_name(dev, name);
532 fwn = devres_alloc(fw_name_devm_release, sizeof(struct fw_name_devm),
536 fwn->name = kstrdup_const(name, GFP_KERNEL);
542 fwn->magic = (unsigned long)&fw_cache;
543 devres_add(dev, fwn);
548 static int fw_add_devm_name(struct device *dev, const char *name)
554 static int assign_firmware_buf(struct firmware *fw, struct device *device,
555 unsigned int opt_flags)
557 struct firmware_buf *buf = fw->priv;
559 mutex_lock(&fw_lock);
560 if (!buf->size || fw_state_is_aborted(&buf->fw_st)) {
561 mutex_unlock(&fw_lock);
566 * add firmware name into devres list so that we can auto cache
567 * and uncache firmware for device.
569 * device may has been deleted already, but the problem
570 * should be fixed in devres or driver core.
572 /* don't cache firmware handled without uevent */
573 if (device && (opt_flags & FW_OPT_UEVENT) &&
574 !(opt_flags & FW_OPT_NOCACHE))
575 fw_add_devm_name(device, buf->fw_id);
578 * After caching firmware image is started, let it piggyback
579 * on request firmware.
581 if (!(opt_flags & FW_OPT_NOCACHE) &&
582 buf->fwc->state == FW_LOADER_START_CACHE) {
583 if (fw_cache_piggyback_on_request(buf->fw_id))
587 /* pass the pages buffer to driver at the last minute */
588 fw_set_page_data(buf, fw);
589 mutex_unlock(&fw_lock);
594 * user-mode helper code
596 #ifdef CONFIG_FW_LOADER_USER_HELPER
597 struct firmware_priv {
600 struct firmware_buf *buf;
604 static struct firmware_priv *to_firmware_priv(struct device *dev)
606 return container_of(dev, struct firmware_priv, dev);
609 static void __fw_load_abort(struct firmware_buf *buf)
612 * There is a small window in which user can write to 'loading'
613 * between loading done and disappearance of 'loading'
615 if (fw_state_is_done(&buf->fw_st))
618 list_del_init(&buf->pending_list);
619 fw_state_aborted(&buf->fw_st);
622 static void fw_load_abort(struct firmware_priv *fw_priv)
624 struct firmware_buf *buf = fw_priv->buf;
626 __fw_load_abort(buf);
629 static LIST_HEAD(pending_fw_head);
631 static void kill_pending_fw_fallback_reqs(bool only_kill_custom)
633 struct firmware_buf *buf;
634 struct firmware_buf *next;
636 mutex_lock(&fw_lock);
637 list_for_each_entry_safe(buf, next, &pending_fw_head, pending_list) {
638 if (!buf->need_uevent || !only_kill_custom)
639 __fw_load_abort(buf);
641 mutex_unlock(&fw_lock);
644 static ssize_t timeout_show(struct class *class, struct class_attribute *attr,
647 return sprintf(buf, "%d\n", loading_timeout);
651 * firmware_timeout_store - set number of seconds to wait for firmware
652 * @class: device class pointer
653 * @attr: device attribute pointer
654 * @buf: buffer to scan for timeout value
655 * @count: number of bytes in @buf
657 * Sets the number of seconds to wait for the firmware. Once
658 * this expires an error will be returned to the driver and no
659 * firmware will be provided.
661 * Note: zero means 'wait forever'.
663 static ssize_t timeout_store(struct class *class, struct class_attribute *attr,
664 const char *buf, size_t count)
666 loading_timeout = simple_strtol(buf, NULL, 10);
667 if (loading_timeout < 0)
672 static CLASS_ATTR_RW(timeout);
674 static struct attribute *firmware_class_attrs[] = {
675 &class_attr_timeout.attr,
678 ATTRIBUTE_GROUPS(firmware_class);
680 static void fw_dev_release(struct device *dev)
682 struct firmware_priv *fw_priv = to_firmware_priv(dev);
687 static int do_firmware_uevent(struct firmware_priv *fw_priv, struct kobj_uevent_env *env)
689 if (add_uevent_var(env, "FIRMWARE=%s", fw_priv->buf->fw_id))
691 if (add_uevent_var(env, "TIMEOUT=%i", loading_timeout))
693 if (add_uevent_var(env, "ASYNC=%d", fw_priv->nowait))
699 static int firmware_uevent(struct device *dev, struct kobj_uevent_env *env)
701 struct firmware_priv *fw_priv = to_firmware_priv(dev);
704 mutex_lock(&fw_lock);
706 err = do_firmware_uevent(fw_priv, env);
707 mutex_unlock(&fw_lock);
711 static struct class firmware_class = {
713 .class_groups = firmware_class_groups,
714 .dev_uevent = firmware_uevent,
715 .dev_release = fw_dev_release,
718 static ssize_t firmware_loading_show(struct device *dev,
719 struct device_attribute *attr, char *buf)
721 struct firmware_priv *fw_priv = to_firmware_priv(dev);
724 mutex_lock(&fw_lock);
726 loading = fw_state_is_loading(&fw_priv->buf->fw_st);
727 mutex_unlock(&fw_lock);
729 return sprintf(buf, "%d\n", loading);
732 /* Some architectures don't have PAGE_KERNEL_RO */
733 #ifndef PAGE_KERNEL_RO
734 #define PAGE_KERNEL_RO PAGE_KERNEL
737 /* one pages buffer should be mapped/unmapped only once */
738 static int fw_map_pages_buf(struct firmware_buf *buf)
740 if (!buf->is_paged_buf)
744 buf->data = vmap(buf->pages, buf->nr_pages, 0, PAGE_KERNEL_RO);
751 * firmware_loading_store - set value in the 'loading' control file
752 * @dev: device pointer
753 * @attr: device attribute pointer
754 * @buf: buffer to scan for loading control value
755 * @count: number of bytes in @buf
757 * The relevant values are:
759 * 1: Start a load, discarding any previous partial load.
760 * 0: Conclude the load and hand the data to the driver code.
761 * -1: Conclude the load with an error and discard any written data.
763 static ssize_t firmware_loading_store(struct device *dev,
764 struct device_attribute *attr,
765 const char *buf, size_t count)
767 struct firmware_priv *fw_priv = to_firmware_priv(dev);
768 struct firmware_buf *fw_buf;
769 ssize_t written = count;
770 int loading = simple_strtol(buf, NULL, 10);
773 mutex_lock(&fw_lock);
774 fw_buf = fw_priv->buf;
775 if (fw_state_is_aborted(&fw_buf->fw_st))
780 /* discarding any previous partial load */
781 if (!fw_state_is_done(&fw_buf->fw_st)) {
782 for (i = 0; i < fw_buf->nr_pages; i++)
783 __free_page(fw_buf->pages[i]);
784 vfree(fw_buf->pages);
785 fw_buf->pages = NULL;
786 fw_buf->page_array_size = 0;
787 fw_buf->nr_pages = 0;
788 fw_state_start(&fw_buf->fw_st);
792 if (fw_state_is_loading(&fw_buf->fw_st)) {
796 * Several loading requests may be pending on
797 * one same firmware buf, so let all requests
798 * see the mapped 'buf->data' once the loading
801 rc = fw_map_pages_buf(fw_buf);
803 dev_err(dev, "%s: map pages failed\n",
806 rc = security_kernel_post_read_file(NULL,
807 fw_buf->data, fw_buf->size,
811 * Same logic as fw_load_abort, only the DONE bit
812 * is ignored and we set ABORT only on failure.
814 list_del_init(&fw_buf->pending_list);
816 fw_state_aborted(&fw_buf->fw_st);
819 fw_state_done(&fw_buf->fw_st);
825 dev_err(dev, "%s: unexpected value (%d)\n", __func__, loading);
828 fw_load_abort(fw_priv);
832 mutex_unlock(&fw_lock);
836 static DEVICE_ATTR(loading, 0644, firmware_loading_show, firmware_loading_store);
838 static void firmware_rw_buf(struct firmware_buf *buf, char *buffer,
839 loff_t offset, size_t count, bool read)
842 memcpy(buffer, buf->data + offset, count);
844 memcpy(buf->data + offset, buffer, count);
847 static void firmware_rw(struct firmware_buf *buf, char *buffer,
848 loff_t offset, size_t count, bool read)
852 int page_nr = offset >> PAGE_SHIFT;
853 int page_ofs = offset & (PAGE_SIZE-1);
854 int page_cnt = min_t(size_t, PAGE_SIZE - page_ofs, count);
856 page_data = kmap(buf->pages[page_nr]);
859 memcpy(buffer, page_data + page_ofs, page_cnt);
861 memcpy(page_data + page_ofs, buffer, page_cnt);
863 kunmap(buf->pages[page_nr]);
870 static ssize_t firmware_data_read(struct file *filp, struct kobject *kobj,
871 struct bin_attribute *bin_attr,
872 char *buffer, loff_t offset, size_t count)
874 struct device *dev = kobj_to_dev(kobj);
875 struct firmware_priv *fw_priv = to_firmware_priv(dev);
876 struct firmware_buf *buf;
879 mutex_lock(&fw_lock);
881 if (!buf || fw_state_is_done(&buf->fw_st)) {
885 if (offset > buf->size) {
889 if (count > buf->size - offset)
890 count = buf->size - offset;
895 firmware_rw_buf(buf, buffer, offset, count, true);
897 firmware_rw(buf, buffer, offset, count, true);
900 mutex_unlock(&fw_lock);
904 static int fw_realloc_buffer(struct firmware_priv *fw_priv, int min_size)
906 struct firmware_buf *buf = fw_priv->buf;
907 int pages_needed = PAGE_ALIGN(min_size) >> PAGE_SHIFT;
909 /* If the array of pages is too small, grow it... */
910 if (buf->page_array_size < pages_needed) {
911 int new_array_size = max(pages_needed,
912 buf->page_array_size * 2);
913 struct page **new_pages;
915 new_pages = vmalloc(new_array_size * sizeof(void *));
917 fw_load_abort(fw_priv);
920 memcpy(new_pages, buf->pages,
921 buf->page_array_size * sizeof(void *));
922 memset(&new_pages[buf->page_array_size], 0, sizeof(void *) *
923 (new_array_size - buf->page_array_size));
925 buf->pages = new_pages;
926 buf->page_array_size = new_array_size;
929 while (buf->nr_pages < pages_needed) {
930 buf->pages[buf->nr_pages] =
931 alloc_page(GFP_KERNEL | __GFP_HIGHMEM);
933 if (!buf->pages[buf->nr_pages]) {
934 fw_load_abort(fw_priv);
943 * firmware_data_write - write method for firmware
944 * @filp: open sysfs file
945 * @kobj: kobject for the device
946 * @bin_attr: bin_attr structure
947 * @buffer: buffer being written
948 * @offset: buffer offset for write in total data store area
949 * @count: buffer size
951 * Data written to the 'data' attribute will be later handed to
952 * the driver as a firmware image.
954 static ssize_t firmware_data_write(struct file *filp, struct kobject *kobj,
955 struct bin_attribute *bin_attr,
956 char *buffer, loff_t offset, size_t count)
958 struct device *dev = kobj_to_dev(kobj);
959 struct firmware_priv *fw_priv = to_firmware_priv(dev);
960 struct firmware_buf *buf;
963 if (!capable(CAP_SYS_RAWIO))
966 mutex_lock(&fw_lock);
968 if (!buf || fw_state_is_done(&buf->fw_st)) {
974 if (offset + count > buf->allocated_size) {
978 firmware_rw_buf(buf, buffer, offset, count, false);
981 retval = fw_realloc_buffer(fw_priv, offset + count);
986 firmware_rw(buf, buffer, offset, count, false);
989 buf->size = max_t(size_t, offset + count, buf->size);
991 mutex_unlock(&fw_lock);
995 static struct bin_attribute firmware_attr_data = {
996 .attr = { .name = "data", .mode = 0644 },
998 .read = firmware_data_read,
999 .write = firmware_data_write,
1002 static struct attribute *fw_dev_attrs[] = {
1003 &dev_attr_loading.attr,
1007 static struct bin_attribute *fw_dev_bin_attrs[] = {
1008 &firmware_attr_data,
1012 static const struct attribute_group fw_dev_attr_group = {
1013 .attrs = fw_dev_attrs,
1014 .bin_attrs = fw_dev_bin_attrs,
1017 static const struct attribute_group *fw_dev_attr_groups[] = {
1022 static struct firmware_priv *
1023 fw_create_instance(struct firmware *firmware, const char *fw_name,
1024 struct device *device, unsigned int opt_flags)
1026 struct firmware_priv *fw_priv;
1027 struct device *f_dev;
1029 fw_priv = kzalloc(sizeof(*fw_priv), GFP_KERNEL);
1031 fw_priv = ERR_PTR(-ENOMEM);
1035 fw_priv->nowait = !!(opt_flags & FW_OPT_NOWAIT);
1036 fw_priv->fw = firmware;
1037 f_dev = &fw_priv->dev;
1039 device_initialize(f_dev);
1040 dev_set_name(f_dev, "%s", fw_name);
1041 f_dev->parent = device;
1042 f_dev->class = &firmware_class;
1043 f_dev->groups = fw_dev_attr_groups;
1048 /* load a firmware via user helper */
1049 static int _request_firmware_load(struct firmware_priv *fw_priv,
1050 unsigned int opt_flags, long timeout)
1053 struct device *f_dev = &fw_priv->dev;
1054 struct firmware_buf *buf = fw_priv->buf;
1056 /* fall back on userspace loading */
1058 buf->is_paged_buf = true;
1060 dev_set_uevent_suppress(f_dev, true);
1062 retval = device_add(f_dev);
1064 dev_err(f_dev, "%s: device_register failed\n", __func__);
1068 mutex_lock(&fw_lock);
1069 list_add(&buf->pending_list, &pending_fw_head);
1070 mutex_unlock(&fw_lock);
1072 if (opt_flags & FW_OPT_UEVENT) {
1073 buf->need_uevent = true;
1074 dev_set_uevent_suppress(f_dev, false);
1075 dev_dbg(f_dev, "firmware: requesting %s\n", buf->fw_id);
1076 kobject_uevent(&fw_priv->dev.kobj, KOBJ_ADD);
1078 timeout = MAX_JIFFY_OFFSET;
1081 retval = fw_state_wait_timeout(&buf->fw_st, timeout);
1083 mutex_lock(&fw_lock);
1084 fw_load_abort(fw_priv);
1085 mutex_unlock(&fw_lock);
1088 if (fw_state_is_aborted(&buf->fw_st))
1090 else if (buf->is_paged_buf && !buf->data)
1099 static int fw_load_from_user_helper(struct firmware *firmware,
1100 const char *name, struct device *device,
1101 unsigned int opt_flags)
1103 struct firmware_priv *fw_priv;
1107 timeout = firmware_loading_timeout();
1108 if (opt_flags & FW_OPT_NOWAIT) {
1109 timeout = usermodehelper_read_lock_wait(timeout);
1111 dev_dbg(device, "firmware: %s loading timed out\n",
1116 ret = usermodehelper_read_trylock();
1118 dev_err(device, "firmware: %s will not be loaded\n",
1124 fw_priv = fw_create_instance(firmware, name, device, opt_flags);
1125 if (IS_ERR(fw_priv)) {
1126 ret = PTR_ERR(fw_priv);
1130 fw_priv->buf = firmware->priv;
1131 ret = _request_firmware_load(fw_priv, opt_flags, timeout);
1134 ret = assign_firmware_buf(firmware, device, opt_flags);
1137 usermodehelper_read_unlock();
1142 #else /* CONFIG_FW_LOADER_USER_HELPER */
1144 fw_load_from_user_helper(struct firmware *firmware, const char *name,
1145 struct device *device, unsigned int opt_flags)
1150 static inline void kill_pending_fw_fallback_reqs(bool only_kill_custom) { }
1152 #endif /* CONFIG_FW_LOADER_USER_HELPER */
1154 /* prepare firmware and firmware_buf structs;
1155 * return 0 if a firmware is already assigned, 1 if need to load one,
1156 * or a negative error code
1159 _request_firmware_prepare(struct firmware **firmware_p, const char *name,
1160 struct device *device, void *dbuf, size_t size)
1162 struct firmware *firmware;
1163 struct firmware_buf *buf;
1166 *firmware_p = firmware = kzalloc(sizeof(*firmware), GFP_KERNEL);
1168 dev_err(device, "%s: kmalloc(struct firmware) failed\n",
1173 if (fw_get_builtin_firmware(firmware, name, dbuf, size)) {
1174 dev_dbg(device, "using built-in %s\n", name);
1175 return 0; /* assigned */
1178 ret = fw_lookup_and_allocate_buf(name, &fw_cache, &buf, dbuf, size);
1181 * bind with 'buf' now to avoid warning in failure path
1182 * of requesting firmware.
1184 firmware->priv = buf;
1187 ret = fw_state_wait(&buf->fw_st);
1189 fw_set_page_data(buf, firmware);
1190 return 0; /* assigned */
1196 return 1; /* need to load */
1200 * Batched requests need only one wake, we need to do this step last due to the
1201 * fallback mechanism. The buf is protected with kref_get(), and it won't be
1202 * released until the last user calls release_firmware().
1204 * Failed batched requests are possible as well, in such cases we just share
1205 * the struct firmware_buf and won't release it until all requests are woken
1206 * and have gone through this same path.
1208 static void fw_abort_batch_reqs(struct firmware *fw)
1210 struct firmware_buf *buf;
1212 /* Loaded directly? */
1213 if (!fw || !fw->priv)
1217 if (!fw_state_is_aborted(&buf->fw_st))
1218 fw_state_aborted(&buf->fw_st);
1221 /* called from request_firmware() and request_firmware_work_func() */
1223 _request_firmware(const struct firmware **firmware_p, const char *name,
1224 struct device *device, void *buf, size_t size,
1225 unsigned int opt_flags)
1227 struct firmware *fw = NULL;
1233 if (!name || name[0] == '\0') {
1238 ret = _request_firmware_prepare(&fw, name, device, buf, size);
1239 if (ret <= 0) /* error or already assigned */
1242 if (!firmware_enabled()) {
1243 WARN(1, "firmware request while host is not available\n");
1248 ret = fw_get_filesystem_firmware(device, fw->priv);
1250 if (!(opt_flags & FW_OPT_NO_WARN))
1252 "Direct firmware load for %s failed with error %d\n",
1254 if (opt_flags & FW_OPT_USERHELPER) {
1255 dev_warn(device, "Falling back to user helper\n");
1256 ret = fw_load_from_user_helper(fw, name, device,
1260 ret = assign_firmware_buf(fw, device, opt_flags);
1264 fw_abort_batch_reqs(fw);
1265 release_firmware(fw);
1274 * request_firmware: - send firmware request and wait for it
1275 * @firmware_p: pointer to firmware image
1276 * @name: name of firmware file
1277 * @device: device for which firmware is being loaded
1279 * @firmware_p will be used to return a firmware image by the name
1280 * of @name for device @device.
1282 * Should be called from user context where sleeping is allowed.
1284 * @name will be used as $FIRMWARE in the uevent environment and
1285 * should be distinctive enough not to be confused with any other
1286 * firmware image for this or any other device.
1288 * Caller must hold the reference count of @device.
1290 * The function can be called safely inside device's suspend and
1294 request_firmware(const struct firmware **firmware_p, const char *name,
1295 struct device *device)
1299 /* Need to pin this module until return */
1300 __module_get(THIS_MODULE);
1301 ret = _request_firmware(firmware_p, name, device, NULL, 0,
1302 FW_OPT_UEVENT | FW_OPT_FALLBACK);
1303 module_put(THIS_MODULE);
1306 EXPORT_SYMBOL(request_firmware);
1309 * request_firmware_direct: - load firmware directly without usermode helper
1310 * @firmware_p: pointer to firmware image
1311 * @name: name of firmware file
1312 * @device: device for which firmware is being loaded
1314 * This function works pretty much like request_firmware(), but this doesn't
1315 * fall back to usermode helper even if the firmware couldn't be loaded
1316 * directly from fs. Hence it's useful for loading optional firmwares, which
1317 * aren't always present, without extra long timeouts of udev.
1319 int request_firmware_direct(const struct firmware **firmware_p,
1320 const char *name, struct device *device)
1324 __module_get(THIS_MODULE);
1325 ret = _request_firmware(firmware_p, name, device, NULL, 0,
1326 FW_OPT_UEVENT | FW_OPT_NO_WARN);
1327 module_put(THIS_MODULE);
1330 EXPORT_SYMBOL_GPL(request_firmware_direct);
1333 * request_firmware_into_buf - load firmware into a previously allocated buffer
1334 * @firmware_p: pointer to firmware image
1335 * @name: name of firmware file
1336 * @device: device for which firmware is being loaded and DMA region allocated
1337 * @buf: address of buffer to load firmware into
1338 * @size: size of buffer
1340 * This function works pretty much like request_firmware(), but it doesn't
1341 * allocate a buffer to hold the firmware data. Instead, the firmware
1342 * is loaded directly into the buffer pointed to by @buf and the @firmware_p
1343 * data member is pointed at @buf.
1345 * This function doesn't cache firmware either.
1348 request_firmware_into_buf(const struct firmware **firmware_p, const char *name,
1349 struct device *device, void *buf, size_t size)
1353 __module_get(THIS_MODULE);
1354 ret = _request_firmware(firmware_p, name, device, buf, size,
1355 FW_OPT_UEVENT | FW_OPT_FALLBACK |
1357 module_put(THIS_MODULE);
1360 EXPORT_SYMBOL(request_firmware_into_buf);
1363 * release_firmware: - release the resource associated with a firmware image
1364 * @fw: firmware resource to release
1366 void release_firmware(const struct firmware *fw)
1369 if (!fw_is_builtin_firmware(fw))
1370 firmware_free_data(fw);
1374 EXPORT_SYMBOL(release_firmware);
1377 struct firmware_work {
1378 struct work_struct work;
1379 struct module *module;
1381 struct device *device;
1383 void (*cont)(const struct firmware *fw, void *context);
1384 unsigned int opt_flags;
1387 static void request_firmware_work_func(struct work_struct *work)
1389 struct firmware_work *fw_work;
1390 const struct firmware *fw;
1392 fw_work = container_of(work, struct firmware_work, work);
1394 _request_firmware(&fw, fw_work->name, fw_work->device, NULL, 0,
1395 fw_work->opt_flags);
1396 fw_work->cont(fw, fw_work->context);
1397 put_device(fw_work->device); /* taken in request_firmware_nowait() */
1399 module_put(fw_work->module);
1400 kfree_const(fw_work->name);
1405 * request_firmware_nowait - asynchronous version of request_firmware
1406 * @module: module requesting the firmware
1407 * @uevent: sends uevent to copy the firmware image if this flag
1408 * is non-zero else the firmware copy must be done manually.
1409 * @name: name of firmware file
1410 * @device: device for which firmware is being loaded
1411 * @gfp: allocation flags
1412 * @context: will be passed over to @cont, and
1413 * @fw may be %NULL if firmware request fails.
1414 * @cont: function will be called asynchronously when the firmware
1417 * Caller must hold the reference count of @device.
1419 * Asynchronous variant of request_firmware() for user contexts:
1420 * - sleep for as small periods as possible since it may
1421 * increase kernel boot time of built-in device drivers
1422 * requesting firmware in their ->probe() methods, if
1423 * @gfp is GFP_KERNEL.
1425 * - can't sleep at all if @gfp is GFP_ATOMIC.
1428 request_firmware_nowait(
1429 struct module *module, bool uevent,
1430 const char *name, struct device *device, gfp_t gfp, void *context,
1431 void (*cont)(const struct firmware *fw, void *context))
1433 struct firmware_work *fw_work;
1435 fw_work = kzalloc(sizeof(struct firmware_work), gfp);
1439 fw_work->module = module;
1440 fw_work->name = kstrdup_const(name, gfp);
1441 if (!fw_work->name) {
1445 fw_work->device = device;
1446 fw_work->context = context;
1447 fw_work->cont = cont;
1448 fw_work->opt_flags = FW_OPT_NOWAIT | FW_OPT_FALLBACK |
1449 (uevent ? FW_OPT_UEVENT : FW_OPT_USERHELPER);
1451 if (!try_module_get(module)) {
1452 kfree_const(fw_work->name);
1457 get_device(fw_work->device);
1458 INIT_WORK(&fw_work->work, request_firmware_work_func);
1459 schedule_work(&fw_work->work);
1462 EXPORT_SYMBOL(request_firmware_nowait);
1464 #ifdef CONFIG_PM_SLEEP
1465 static ASYNC_DOMAIN_EXCLUSIVE(fw_cache_domain);
1468 * cache_firmware - cache one firmware image in kernel memory space
1469 * @fw_name: the firmware image name
1471 * Cache firmware in kernel memory so that drivers can use it when
1472 * system isn't ready for them to request firmware image from userspace.
1473 * Once it returns successfully, driver can use request_firmware or its
1474 * nowait version to get the cached firmware without any interacting
1477 * Return 0 if the firmware image has been cached successfully
1478 * Return !0 otherwise
1481 static int cache_firmware(const char *fw_name)
1484 const struct firmware *fw;
1486 pr_debug("%s: %s\n", __func__, fw_name);
1488 ret = request_firmware(&fw, fw_name, NULL);
1492 pr_debug("%s: %s ret=%d\n", __func__, fw_name, ret);
1497 static struct firmware_buf *fw_lookup_buf(const char *fw_name)
1499 struct firmware_buf *tmp;
1500 struct firmware_cache *fwc = &fw_cache;
1502 spin_lock(&fwc->lock);
1503 tmp = __fw_lookup_buf(fw_name);
1504 spin_unlock(&fwc->lock);
1510 * uncache_firmware - remove one cached firmware image
1511 * @fw_name: the firmware image name
1513 * Uncache one firmware image which has been cached successfully
1516 * Return 0 if the firmware cache has been removed successfully
1517 * Return !0 otherwise
1520 static int uncache_firmware(const char *fw_name)
1522 struct firmware_buf *buf;
1525 pr_debug("%s: %s\n", __func__, fw_name);
1527 if (fw_get_builtin_firmware(&fw, fw_name, NULL, 0))
1530 buf = fw_lookup_buf(fw_name);
1539 static struct fw_cache_entry *alloc_fw_cache_entry(const char *name)
1541 struct fw_cache_entry *fce;
1543 fce = kzalloc(sizeof(*fce), GFP_ATOMIC);
1547 fce->name = kstrdup_const(name, GFP_ATOMIC);
1557 static int __fw_entry_found(const char *name)
1559 struct firmware_cache *fwc = &fw_cache;
1560 struct fw_cache_entry *fce;
1562 list_for_each_entry(fce, &fwc->fw_names, list) {
1563 if (!strcmp(fce->name, name))
1569 static int fw_cache_piggyback_on_request(const char *name)
1571 struct firmware_cache *fwc = &fw_cache;
1572 struct fw_cache_entry *fce;
1575 spin_lock(&fwc->name_lock);
1576 if (__fw_entry_found(name))
1579 fce = alloc_fw_cache_entry(name);
1582 list_add(&fce->list, &fwc->fw_names);
1583 pr_debug("%s: fw: %s\n", __func__, name);
1586 spin_unlock(&fwc->name_lock);
1590 static void free_fw_cache_entry(struct fw_cache_entry *fce)
1592 kfree_const(fce->name);
1596 static void __async_dev_cache_fw_image(void *fw_entry,
1597 async_cookie_t cookie)
1599 struct fw_cache_entry *fce = fw_entry;
1600 struct firmware_cache *fwc = &fw_cache;
1603 ret = cache_firmware(fce->name);
1605 spin_lock(&fwc->name_lock);
1606 list_del(&fce->list);
1607 spin_unlock(&fwc->name_lock);
1609 free_fw_cache_entry(fce);
1613 /* called with dev->devres_lock held */
1614 static void dev_create_fw_entry(struct device *dev, void *res,
1617 struct fw_name_devm *fwn = res;
1618 const char *fw_name = fwn->name;
1619 struct list_head *head = data;
1620 struct fw_cache_entry *fce;
1622 fce = alloc_fw_cache_entry(fw_name);
1624 list_add(&fce->list, head);
1627 static int devm_name_match(struct device *dev, void *res,
1630 struct fw_name_devm *fwn = res;
1631 return (fwn->magic == (unsigned long)match_data);
1634 static void dev_cache_fw_image(struct device *dev, void *data)
1637 struct fw_cache_entry *fce;
1638 struct fw_cache_entry *fce_next;
1639 struct firmware_cache *fwc = &fw_cache;
1641 devres_for_each_res(dev, fw_name_devm_release,
1642 devm_name_match, &fw_cache,
1643 dev_create_fw_entry, &todo);
1645 list_for_each_entry_safe(fce, fce_next, &todo, list) {
1646 list_del(&fce->list);
1648 spin_lock(&fwc->name_lock);
1649 /* only one cache entry for one firmware */
1650 if (!__fw_entry_found(fce->name)) {
1651 list_add(&fce->list, &fwc->fw_names);
1653 free_fw_cache_entry(fce);
1656 spin_unlock(&fwc->name_lock);
1659 async_schedule_domain(__async_dev_cache_fw_image,
1665 static void __device_uncache_fw_images(void)
1667 struct firmware_cache *fwc = &fw_cache;
1668 struct fw_cache_entry *fce;
1670 spin_lock(&fwc->name_lock);
1671 while (!list_empty(&fwc->fw_names)) {
1672 fce = list_entry(fwc->fw_names.next,
1673 struct fw_cache_entry, list);
1674 list_del(&fce->list);
1675 spin_unlock(&fwc->name_lock);
1677 uncache_firmware(fce->name);
1678 free_fw_cache_entry(fce);
1680 spin_lock(&fwc->name_lock);
1682 spin_unlock(&fwc->name_lock);
1686 * device_cache_fw_images - cache devices' firmware
1688 * If one device called request_firmware or its nowait version
1689 * successfully before, the firmware names are recored into the
1690 * device's devres link list, so device_cache_fw_images can call
1691 * cache_firmware() to cache these firmwares for the device,
1692 * then the device driver can load its firmwares easily at
1693 * time when system is not ready to complete loading firmware.
1695 static void device_cache_fw_images(void)
1697 struct firmware_cache *fwc = &fw_cache;
1701 pr_debug("%s\n", __func__);
1703 /* cancel uncache work */
1704 cancel_delayed_work_sync(&fwc->work);
1707 * use small loading timeout for caching devices' firmware
1708 * because all these firmware images have been loaded
1709 * successfully at lease once, also system is ready for
1710 * completing firmware loading now. The maximum size of
1711 * firmware in current distributions is about 2M bytes,
1712 * so 10 secs should be enough.
1714 old_timeout = loading_timeout;
1715 loading_timeout = 10;
1717 mutex_lock(&fw_lock);
1718 fwc->state = FW_LOADER_START_CACHE;
1719 dpm_for_each_dev(NULL, dev_cache_fw_image);
1720 mutex_unlock(&fw_lock);
1722 /* wait for completion of caching firmware for all devices */
1723 async_synchronize_full_domain(&fw_cache_domain);
1725 loading_timeout = old_timeout;
1729 * device_uncache_fw_images - uncache devices' firmware
1731 * uncache all firmwares which have been cached successfully
1732 * by device_uncache_fw_images earlier
1734 static void device_uncache_fw_images(void)
1736 pr_debug("%s\n", __func__);
1737 __device_uncache_fw_images();
1740 static void device_uncache_fw_images_work(struct work_struct *work)
1742 device_uncache_fw_images();
1746 * device_uncache_fw_images_delay - uncache devices firmwares
1747 * @delay: number of milliseconds to delay uncache device firmwares
1749 * uncache all devices's firmwares which has been cached successfully
1750 * by device_cache_fw_images after @delay milliseconds.
1752 static void device_uncache_fw_images_delay(unsigned long delay)
1754 queue_delayed_work(system_power_efficient_wq, &fw_cache.work,
1755 msecs_to_jiffies(delay));
1759 * fw_pm_notify - notifier for suspend/resume
1760 * @notify_block: unused
1761 * @mode: mode we are switching to
1764 * Used to modify the firmware_class state as we move in between states.
1765 * The firmware_class implements a firmware cache to enable device driver
1766 * to fetch firmware upon resume before the root filesystem is ready. We
1767 * disable API calls which do not use the built-in firmware or the firmware
1768 * cache when we know these calls will not work.
1770 * The inner logic behind all this is a bit complex so it is worth summarizing
1771 * the kernel's own suspend/resume process with context and focus on how this
1772 * can impact the firmware API.
1774 * First a review on how we go to suspend::
1776 * pm_suspend() --> enter_state() -->
1778 * suspend_prepare() -->
1779 * __pm_notifier_call_chain(PM_SUSPEND_PREPARE, ...);
1780 * suspend_freeze_processes() -->
1781 * freeze_processes() -->
1782 * __usermodehelper_set_disable_depth(UMH_DISABLED);
1783 * freeze all tasks ...
1784 * freeze_kernel_threads()
1785 * suspend_devices_and_enter() -->
1786 * dpm_suspend_start() -->
1789 * suspend_enter() -->
1790 * platform_suspend_prepare()
1791 * dpm_suspend_late()
1795 * When we resume we bail out of a loop from suspend_devices_and_enter() and
1796 * unwind back out to the caller enter_state() where we were before as follows::
1799 * suspend_devices_and_enter() --> (bail from loop)
1800 * dpm_resume_end() -->
1803 * suspend_finish() -->
1804 * suspend_thaw_processes() -->
1805 * thaw_processes() -->
1806 * __usermodehelper_set_disable_depth(UMH_FREEZING);
1807 * thaw_workqueues();
1808 * thaw all processes ...
1809 * usermodehelper_enable();
1810 * pm_notifier_call_chain(PM_POST_SUSPEND);
1812 * fw_pm_notify() works through pm_notifier_call_chain().
1814 static int fw_pm_notify(struct notifier_block *notify_block,
1815 unsigned long mode, void *unused)
1818 case PM_HIBERNATION_PREPARE:
1819 case PM_SUSPEND_PREPARE:
1820 case PM_RESTORE_PREPARE:
1822 * kill pending fallback requests with a custom fallback
1823 * to avoid stalling suspend.
1825 kill_pending_fw_fallback_reqs(true);
1826 device_cache_fw_images();
1830 case PM_POST_SUSPEND:
1831 case PM_POST_HIBERNATION:
1832 case PM_POST_RESTORE:
1834 * In case that system sleep failed and syscore_suspend is
1837 mutex_lock(&fw_lock);
1838 fw_cache.state = FW_LOADER_NO_CACHE;
1839 mutex_unlock(&fw_lock);
1842 device_uncache_fw_images_delay(10 * MSEC_PER_SEC);
1849 /* stop caching firmware once syscore_suspend is reached */
1850 static int fw_suspend(void)
1852 fw_cache.state = FW_LOADER_NO_CACHE;
1856 static struct syscore_ops fw_syscore_ops = {
1857 .suspend = fw_suspend,
1860 static int fw_cache_piggyback_on_request(const char *name)
1866 static void __init fw_cache_init(void)
1868 spin_lock_init(&fw_cache.lock);
1869 INIT_LIST_HEAD(&fw_cache.head);
1870 fw_cache.state = FW_LOADER_NO_CACHE;
1872 #ifdef CONFIG_PM_SLEEP
1873 spin_lock_init(&fw_cache.name_lock);
1874 INIT_LIST_HEAD(&fw_cache.fw_names);
1876 INIT_DELAYED_WORK(&fw_cache.work,
1877 device_uncache_fw_images_work);
1879 fw_cache.pm_notify.notifier_call = fw_pm_notify;
1880 register_pm_notifier(&fw_cache.pm_notify);
1882 register_syscore_ops(&fw_syscore_ops);
1886 static int fw_shutdown_notify(struct notifier_block *unused1,
1887 unsigned long unused2, void *unused3)
1891 * Kill all pending fallback requests to avoid both stalling shutdown,
1892 * and avoid a deadlock with the usermode_lock.
1894 kill_pending_fw_fallback_reqs(false);
1899 static struct notifier_block fw_shutdown_nb = {
1900 .notifier_call = fw_shutdown_notify,
1903 static int __init firmware_class_init(void)
1907 register_reboot_notifier(&fw_shutdown_nb);
1908 #ifdef CONFIG_FW_LOADER_USER_HELPER
1909 return class_register(&firmware_class);
1915 static void __exit firmware_class_exit(void)
1918 #ifdef CONFIG_PM_SLEEP
1919 unregister_syscore_ops(&fw_syscore_ops);
1920 unregister_pm_notifier(&fw_cache.pm_notify);
1922 unregister_reboot_notifier(&fw_shutdown_nb);
1923 #ifdef CONFIG_FW_LOADER_USER_HELPER
1924 class_unregister(&firmware_class);
1928 fs_initcall(firmware_class_init);
1929 module_exit(firmware_class_exit);