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 struct firmware_cache fw_cache
;
261 static struct firmware_buf
*__allocate_fw_buf(const char *fw_name
,
262 struct firmware_cache
*fwc
,
263 void *dbuf
, size_t size
)
265 struct firmware_buf
*buf
;
267 buf
= kzalloc(sizeof(*buf
), GFP_ATOMIC
);
271 buf
->fw_id
= kstrdup_const(fw_name
, GFP_ATOMIC
);
277 kref_init(&buf
->ref
);
280 buf
->allocated_size
= size
;
281 fw_state_init(&buf
->fw_st
);
282 #ifdef CONFIG_FW_LOADER_USER_HELPER
283 INIT_LIST_HEAD(&buf
->pending_list
);
286 pr_debug("%s: fw-%s buf=%p\n", __func__
, fw_name
, buf
);
291 static struct firmware_buf
*__fw_lookup_buf(const char *fw_name
)
293 struct firmware_buf
*tmp
;
294 struct firmware_cache
*fwc
= &fw_cache
;
296 list_for_each_entry(tmp
, &fwc
->head
, list
)
297 if (!strcmp(tmp
->fw_id
, fw_name
))
302 static int fw_lookup_and_allocate_buf(const char *fw_name
,
303 struct firmware_cache
*fwc
,
304 struct firmware_buf
**buf
, void *dbuf
,
307 struct firmware_buf
*tmp
;
309 spin_lock(&fwc
->lock
);
310 tmp
= __fw_lookup_buf(fw_name
);
313 spin_unlock(&fwc
->lock
);
317 tmp
= __allocate_fw_buf(fw_name
, fwc
, dbuf
, size
);
319 list_add(&tmp
->list
, &fwc
->head
);
320 spin_unlock(&fwc
->lock
);
324 return tmp
? 0 : -ENOMEM
;
327 static void __fw_free_buf(struct kref
*ref
)
328 __releases(&fwc
->lock
)
330 struct firmware_buf
*buf
= to_fwbuf(ref
);
331 struct firmware_cache
*fwc
= buf
->fwc
;
333 pr_debug("%s: fw-%s buf=%p data=%p size=%u\n",
334 __func__
, buf
->fw_id
, buf
, buf
->data
,
335 (unsigned int)buf
->size
);
337 list_del(&buf
->list
);
338 spin_unlock(&fwc
->lock
);
340 #ifdef CONFIG_FW_LOADER_USER_HELPER
341 if (buf
->is_paged_buf
) {
344 for (i
= 0; i
< buf
->nr_pages
; i
++)
345 __free_page(buf
->pages
[i
]);
349 if (!buf
->allocated_size
)
351 kfree_const(buf
->fw_id
);
355 static void fw_free_buf(struct firmware_buf
*buf
)
357 struct firmware_cache
*fwc
= buf
->fwc
;
358 spin_lock(&fwc
->lock
);
359 if (!kref_put(&buf
->ref
, __fw_free_buf
))
360 spin_unlock(&fwc
->lock
);
363 /* direct firmware loading support */
364 static char fw_path_para
[256];
365 static const char * const fw_path
[] = {
367 "/lib/firmware/updates/" UTS_RELEASE
,
368 "/lib/firmware/updates",
369 "/lib/firmware/" UTS_RELEASE
,
374 * Typical usage is that passing 'firmware_class.path=$CUSTOMIZED_PATH'
375 * from kernel command line because firmware_class is generally built in
376 * kernel instead of module.
378 module_param_string(path
, fw_path_para
, sizeof(fw_path_para
), 0644);
379 MODULE_PARM_DESC(path
, "customized firmware image search path with a higher priority than default path");
382 fw_get_filesystem_firmware(struct device
*device
, struct firmware_buf
*buf
)
388 enum kernel_read_file_id id
= READING_FIRMWARE
;
389 size_t msize
= INT_MAX
;
391 /* Already populated data member means we're loading into a buffer */
393 id
= READING_FIRMWARE_PREALLOC_BUFFER
;
394 msize
= buf
->allocated_size
;
401 for (i
= 0; i
< ARRAY_SIZE(fw_path
); i
++) {
402 /* skip the unset customized path */
406 len
= snprintf(path
, PATH_MAX
, "%s/%s",
407 fw_path
[i
], buf
->fw_id
);
408 if (len
>= PATH_MAX
) {
414 rc
= kernel_read_file_from_path(path
, &buf
->data
, &size
, msize
,
418 dev_dbg(device
, "loading %s failed with error %d\n",
421 dev_warn(device
, "loading %s failed with error %d\n",
425 dev_dbg(device
, "direct-loading %s\n", buf
->fw_id
);
427 fw_state_done(&buf
->fw_st
);
435 /* firmware holds the ownership of pages */
436 static void firmware_free_data(const struct firmware
*fw
)
438 /* Loaded directly? */
443 fw_free_buf(fw
->priv
);
446 /* store the pages buffer info firmware from buf */
447 static void fw_set_page_data(struct firmware_buf
*buf
, struct firmware
*fw
)
450 #ifdef CONFIG_FW_LOADER_USER_HELPER
451 fw
->pages
= buf
->pages
;
453 fw
->size
= buf
->size
;
454 fw
->data
= buf
->data
;
456 pr_debug("%s: fw-%s buf=%p data=%p size=%u\n",
457 __func__
, buf
->fw_id
, buf
, buf
->data
,
458 (unsigned int)buf
->size
);
461 #ifdef CONFIG_PM_SLEEP
462 static void fw_name_devm_release(struct device
*dev
, void *res
)
464 struct fw_name_devm
*fwn
= res
;
466 if (fwn
->magic
== (unsigned long)&fw_cache
)
467 pr_debug("%s: fw_name-%s devm-%p released\n",
468 __func__
, fwn
->name
, res
);
469 kfree_const(fwn
->name
);
472 static int fw_devm_match(struct device
*dev
, void *res
,
475 struct fw_name_devm
*fwn
= res
;
477 return (fwn
->magic
== (unsigned long)&fw_cache
) &&
478 !strcmp(fwn
->name
, match_data
);
481 static struct fw_name_devm
*fw_find_devm_name(struct device
*dev
,
484 struct fw_name_devm
*fwn
;
486 fwn
= devres_find(dev
, fw_name_devm_release
,
487 fw_devm_match
, (void *)name
);
491 /* add firmware name into devres list */
492 static int fw_add_devm_name(struct device
*dev
, const char *name
)
494 struct fw_name_devm
*fwn
;
496 fwn
= fw_find_devm_name(dev
, name
);
500 fwn
= devres_alloc(fw_name_devm_release
, sizeof(struct fw_name_devm
),
504 fwn
->name
= kstrdup_const(name
, GFP_KERNEL
);
510 fwn
->magic
= (unsigned long)&fw_cache
;
511 devres_add(dev
, fwn
);
516 static int fw_add_devm_name(struct device
*dev
, const char *name
)
522 static int assign_firmware_buf(struct firmware
*fw
, struct device
*device
,
523 unsigned int opt_flags
)
525 struct firmware_buf
*buf
= fw
->priv
;
527 mutex_lock(&fw_lock
);
528 if (!buf
->size
|| fw_state_is_aborted(&buf
->fw_st
)) {
529 mutex_unlock(&fw_lock
);
534 * add firmware name into devres list so that we can auto cache
535 * and uncache firmware for device.
537 * device may has been deleted already, but the problem
538 * should be fixed in devres or driver core.
540 /* don't cache firmware handled without uevent */
541 if (device
&& (opt_flags
& FW_OPT_UEVENT
) &&
542 !(opt_flags
& FW_OPT_NOCACHE
))
543 fw_add_devm_name(device
, buf
->fw_id
);
546 * After caching firmware image is started, let it piggyback
547 * on request firmware.
549 if (!(opt_flags
& FW_OPT_NOCACHE
) &&
550 buf
->fwc
->state
== FW_LOADER_START_CACHE
) {
551 if (fw_cache_piggyback_on_request(buf
->fw_id
))
555 /* pass the pages buffer to driver at the last minute */
556 fw_set_page_data(buf
, fw
);
557 mutex_unlock(&fw_lock
);
562 * user-mode helper code
564 #ifdef CONFIG_FW_LOADER_USER_HELPER
565 struct firmware_priv
{
568 struct firmware_buf
*buf
;
572 static struct firmware_priv
*to_firmware_priv(struct device
*dev
)
574 return container_of(dev
, struct firmware_priv
, dev
);
577 static void __fw_load_abort(struct firmware_buf
*buf
)
580 * There is a small window in which user can write to 'loading'
581 * between loading done and disappearance of 'loading'
583 if (fw_state_is_done(&buf
->fw_st
))
586 list_del_init(&buf
->pending_list
);
587 fw_state_aborted(&buf
->fw_st
);
590 static void fw_load_abort(struct firmware_priv
*fw_priv
)
592 struct firmware_buf
*buf
= fw_priv
->buf
;
594 __fw_load_abort(buf
);
597 static LIST_HEAD(pending_fw_head
);
599 static void kill_pending_fw_fallback_reqs(bool only_kill_custom
)
601 struct firmware_buf
*buf
;
602 struct firmware_buf
*next
;
604 mutex_lock(&fw_lock
);
605 list_for_each_entry_safe(buf
, next
, &pending_fw_head
, pending_list
) {
606 if (!buf
->need_uevent
|| !only_kill_custom
)
607 __fw_load_abort(buf
);
609 mutex_unlock(&fw_lock
);
612 static ssize_t
timeout_show(struct class *class, struct class_attribute
*attr
,
615 return sprintf(buf
, "%d\n", loading_timeout
);
619 * firmware_timeout_store - set number of seconds to wait for firmware
620 * @class: device class pointer
621 * @attr: device attribute pointer
622 * @buf: buffer to scan for timeout value
623 * @count: number of bytes in @buf
625 * Sets the number of seconds to wait for the firmware. Once
626 * this expires an error will be returned to the driver and no
627 * firmware will be provided.
629 * Note: zero means 'wait forever'.
631 static ssize_t
timeout_store(struct class *class, struct class_attribute
*attr
,
632 const char *buf
, size_t count
)
634 loading_timeout
= simple_strtol(buf
, NULL
, 10);
635 if (loading_timeout
< 0)
640 static CLASS_ATTR_RW(timeout
);
642 static struct attribute
*firmware_class_attrs
[] = {
643 &class_attr_timeout
.attr
,
646 ATTRIBUTE_GROUPS(firmware_class
);
648 static void fw_dev_release(struct device
*dev
)
650 struct firmware_priv
*fw_priv
= to_firmware_priv(dev
);
655 static int do_firmware_uevent(struct firmware_priv
*fw_priv
, struct kobj_uevent_env
*env
)
657 if (add_uevent_var(env
, "FIRMWARE=%s", fw_priv
->buf
->fw_id
))
659 if (add_uevent_var(env
, "TIMEOUT=%i", loading_timeout
))
661 if (add_uevent_var(env
, "ASYNC=%d", fw_priv
->nowait
))
667 static int firmware_uevent(struct device
*dev
, struct kobj_uevent_env
*env
)
669 struct firmware_priv
*fw_priv
= to_firmware_priv(dev
);
672 mutex_lock(&fw_lock
);
674 err
= do_firmware_uevent(fw_priv
, env
);
675 mutex_unlock(&fw_lock
);
679 static struct class firmware_class
= {
681 .class_groups
= firmware_class_groups
,
682 .dev_uevent
= firmware_uevent
,
683 .dev_release
= fw_dev_release
,
686 static ssize_t
firmware_loading_show(struct device
*dev
,
687 struct device_attribute
*attr
, char *buf
)
689 struct firmware_priv
*fw_priv
= to_firmware_priv(dev
);
692 mutex_lock(&fw_lock
);
694 loading
= fw_state_is_loading(&fw_priv
->buf
->fw_st
);
695 mutex_unlock(&fw_lock
);
697 return sprintf(buf
, "%d\n", loading
);
700 /* Some architectures don't have PAGE_KERNEL_RO */
701 #ifndef PAGE_KERNEL_RO
702 #define PAGE_KERNEL_RO PAGE_KERNEL
705 /* one pages buffer should be mapped/unmapped only once */
706 static int fw_map_pages_buf(struct firmware_buf
*buf
)
708 if (!buf
->is_paged_buf
)
712 buf
->data
= vmap(buf
->pages
, buf
->nr_pages
, 0, PAGE_KERNEL_RO
);
719 * firmware_loading_store - set value in the 'loading' control file
720 * @dev: device pointer
721 * @attr: device attribute pointer
722 * @buf: buffer to scan for loading control value
723 * @count: number of bytes in @buf
725 * The relevant values are:
727 * 1: Start a load, discarding any previous partial load.
728 * 0: Conclude the load and hand the data to the driver code.
729 * -1: Conclude the load with an error and discard any written data.
731 static ssize_t
firmware_loading_store(struct device
*dev
,
732 struct device_attribute
*attr
,
733 const char *buf
, size_t count
)
735 struct firmware_priv
*fw_priv
= to_firmware_priv(dev
);
736 struct firmware_buf
*fw_buf
;
737 ssize_t written
= count
;
738 int loading
= simple_strtol(buf
, NULL
, 10);
741 mutex_lock(&fw_lock
);
742 fw_buf
= fw_priv
->buf
;
743 if (fw_state_is_aborted(&fw_buf
->fw_st
))
748 /* discarding any previous partial load */
749 if (!fw_state_is_done(&fw_buf
->fw_st
)) {
750 for (i
= 0; i
< fw_buf
->nr_pages
; i
++)
751 __free_page(fw_buf
->pages
[i
]);
752 vfree(fw_buf
->pages
);
753 fw_buf
->pages
= NULL
;
754 fw_buf
->page_array_size
= 0;
755 fw_buf
->nr_pages
= 0;
756 fw_state_start(&fw_buf
->fw_st
);
760 if (fw_state_is_loading(&fw_buf
->fw_st
)) {
764 * Several loading requests may be pending on
765 * one same firmware buf, so let all requests
766 * see the mapped 'buf->data' once the loading
769 rc
= fw_map_pages_buf(fw_buf
);
771 dev_err(dev
, "%s: map pages failed\n",
774 rc
= security_kernel_post_read_file(NULL
,
775 fw_buf
->data
, fw_buf
->size
,
779 * Same logic as fw_load_abort, only the DONE bit
780 * is ignored and we set ABORT only on failure.
782 list_del_init(&fw_buf
->pending_list
);
784 fw_state_aborted(&fw_buf
->fw_st
);
787 fw_state_done(&fw_buf
->fw_st
);
793 dev_err(dev
, "%s: unexpected value (%d)\n", __func__
, loading
);
796 fw_load_abort(fw_priv
);
800 mutex_unlock(&fw_lock
);
804 static DEVICE_ATTR(loading
, 0644, firmware_loading_show
, firmware_loading_store
);
806 static void firmware_rw_buf(struct firmware_buf
*buf
, char *buffer
,
807 loff_t offset
, size_t count
, bool read
)
810 memcpy(buffer
, buf
->data
+ offset
, count
);
812 memcpy(buf
->data
+ offset
, buffer
, count
);
815 static void firmware_rw(struct firmware_buf
*buf
, char *buffer
,
816 loff_t offset
, size_t count
, bool read
)
820 int page_nr
= offset
>> PAGE_SHIFT
;
821 int page_ofs
= offset
& (PAGE_SIZE
-1);
822 int page_cnt
= min_t(size_t, PAGE_SIZE
- page_ofs
, count
);
824 page_data
= kmap(buf
->pages
[page_nr
]);
827 memcpy(buffer
, page_data
+ page_ofs
, page_cnt
);
829 memcpy(page_data
+ page_ofs
, buffer
, page_cnt
);
831 kunmap(buf
->pages
[page_nr
]);
838 static ssize_t
firmware_data_read(struct file
*filp
, struct kobject
*kobj
,
839 struct bin_attribute
*bin_attr
,
840 char *buffer
, loff_t offset
, size_t count
)
842 struct device
*dev
= kobj_to_dev(kobj
);
843 struct firmware_priv
*fw_priv
= to_firmware_priv(dev
);
844 struct firmware_buf
*buf
;
847 mutex_lock(&fw_lock
);
849 if (!buf
|| fw_state_is_done(&buf
->fw_st
)) {
853 if (offset
> buf
->size
) {
857 if (count
> buf
->size
- offset
)
858 count
= buf
->size
- offset
;
863 firmware_rw_buf(buf
, buffer
, offset
, count
, true);
865 firmware_rw(buf
, buffer
, offset
, count
, true);
868 mutex_unlock(&fw_lock
);
872 static int fw_realloc_buffer(struct firmware_priv
*fw_priv
, int min_size
)
874 struct firmware_buf
*buf
= fw_priv
->buf
;
875 int pages_needed
= PAGE_ALIGN(min_size
) >> PAGE_SHIFT
;
877 /* If the array of pages is too small, grow it... */
878 if (buf
->page_array_size
< pages_needed
) {
879 int new_array_size
= max(pages_needed
,
880 buf
->page_array_size
* 2);
881 struct page
**new_pages
;
883 new_pages
= vmalloc(new_array_size
* sizeof(void *));
885 fw_load_abort(fw_priv
);
888 memcpy(new_pages
, buf
->pages
,
889 buf
->page_array_size
* sizeof(void *));
890 memset(&new_pages
[buf
->page_array_size
], 0, sizeof(void *) *
891 (new_array_size
- buf
->page_array_size
));
893 buf
->pages
= new_pages
;
894 buf
->page_array_size
= new_array_size
;
897 while (buf
->nr_pages
< pages_needed
) {
898 buf
->pages
[buf
->nr_pages
] =
899 alloc_page(GFP_KERNEL
| __GFP_HIGHMEM
);
901 if (!buf
->pages
[buf
->nr_pages
]) {
902 fw_load_abort(fw_priv
);
911 * firmware_data_write - write method for firmware
912 * @filp: open sysfs file
913 * @kobj: kobject for the device
914 * @bin_attr: bin_attr structure
915 * @buffer: buffer being written
916 * @offset: buffer offset for write in total data store area
917 * @count: buffer size
919 * Data written to the 'data' attribute will be later handed to
920 * the driver as a firmware image.
922 static ssize_t
firmware_data_write(struct file
*filp
, struct kobject
*kobj
,
923 struct bin_attribute
*bin_attr
,
924 char *buffer
, loff_t offset
, size_t count
)
926 struct device
*dev
= kobj_to_dev(kobj
);
927 struct firmware_priv
*fw_priv
= to_firmware_priv(dev
);
928 struct firmware_buf
*buf
;
931 if (!capable(CAP_SYS_RAWIO
))
934 mutex_lock(&fw_lock
);
936 if (!buf
|| fw_state_is_done(&buf
->fw_st
)) {
942 if (offset
+ count
> buf
->allocated_size
) {
946 firmware_rw_buf(buf
, buffer
, offset
, count
, false);
949 retval
= fw_realloc_buffer(fw_priv
, offset
+ count
);
954 firmware_rw(buf
, buffer
, offset
, count
, false);
957 buf
->size
= max_t(size_t, offset
+ count
, buf
->size
);
959 mutex_unlock(&fw_lock
);
963 static struct bin_attribute firmware_attr_data
= {
964 .attr
= { .name
= "data", .mode
= 0644 },
966 .read
= firmware_data_read
,
967 .write
= firmware_data_write
,
970 static struct attribute
*fw_dev_attrs
[] = {
971 &dev_attr_loading
.attr
,
975 static struct bin_attribute
*fw_dev_bin_attrs
[] = {
980 static const struct attribute_group fw_dev_attr_group
= {
981 .attrs
= fw_dev_attrs
,
982 .bin_attrs
= fw_dev_bin_attrs
,
985 static const struct attribute_group
*fw_dev_attr_groups
[] = {
990 static struct firmware_priv
*
991 fw_create_instance(struct firmware
*firmware
, const char *fw_name
,
992 struct device
*device
, unsigned int opt_flags
)
994 struct firmware_priv
*fw_priv
;
995 struct device
*f_dev
;
997 fw_priv
= kzalloc(sizeof(*fw_priv
), GFP_KERNEL
);
999 fw_priv
= ERR_PTR(-ENOMEM
);
1003 fw_priv
->nowait
= !!(opt_flags
& FW_OPT_NOWAIT
);
1004 fw_priv
->fw
= firmware
;
1005 f_dev
= &fw_priv
->dev
;
1007 device_initialize(f_dev
);
1008 dev_set_name(f_dev
, "%s", fw_name
);
1009 f_dev
->parent
= device
;
1010 f_dev
->class = &firmware_class
;
1011 f_dev
->groups
= fw_dev_attr_groups
;
1016 /* load a firmware via user helper */
1017 static int _request_firmware_load(struct firmware_priv
*fw_priv
,
1018 unsigned int opt_flags
, long timeout
)
1021 struct device
*f_dev
= &fw_priv
->dev
;
1022 struct firmware_buf
*buf
= fw_priv
->buf
;
1024 /* fall back on userspace loading */
1026 buf
->is_paged_buf
= true;
1028 dev_set_uevent_suppress(f_dev
, true);
1030 retval
= device_add(f_dev
);
1032 dev_err(f_dev
, "%s: device_register failed\n", __func__
);
1036 mutex_lock(&fw_lock
);
1037 list_add(&buf
->pending_list
, &pending_fw_head
);
1038 mutex_unlock(&fw_lock
);
1040 if (opt_flags
& FW_OPT_UEVENT
) {
1041 buf
->need_uevent
= true;
1042 dev_set_uevent_suppress(f_dev
, false);
1043 dev_dbg(f_dev
, "firmware: requesting %s\n", buf
->fw_id
);
1044 kobject_uevent(&fw_priv
->dev
.kobj
, KOBJ_ADD
);
1046 timeout
= MAX_JIFFY_OFFSET
;
1049 retval
= fw_state_wait_timeout(&buf
->fw_st
, timeout
);
1051 mutex_lock(&fw_lock
);
1052 fw_load_abort(fw_priv
);
1053 mutex_unlock(&fw_lock
);
1056 if (fw_state_is_aborted(&buf
->fw_st
))
1058 else if (buf
->is_paged_buf
&& !buf
->data
)
1067 static int fw_load_from_user_helper(struct firmware
*firmware
,
1068 const char *name
, struct device
*device
,
1069 unsigned int opt_flags
)
1071 struct firmware_priv
*fw_priv
;
1075 timeout
= firmware_loading_timeout();
1076 if (opt_flags
& FW_OPT_NOWAIT
) {
1077 timeout
= usermodehelper_read_lock_wait(timeout
);
1079 dev_dbg(device
, "firmware: %s loading timed out\n",
1084 ret
= usermodehelper_read_trylock();
1086 dev_err(device
, "firmware: %s will not be loaded\n",
1092 fw_priv
= fw_create_instance(firmware
, name
, device
, opt_flags
);
1093 if (IS_ERR(fw_priv
)) {
1094 ret
= PTR_ERR(fw_priv
);
1098 fw_priv
->buf
= firmware
->priv
;
1099 ret
= _request_firmware_load(fw_priv
, opt_flags
, timeout
);
1102 ret
= assign_firmware_buf(firmware
, device
, opt_flags
);
1105 usermodehelper_read_unlock();
1110 #else /* CONFIG_FW_LOADER_USER_HELPER */
1112 fw_load_from_user_helper(struct firmware
*firmware
, const char *name
,
1113 struct device
*device
, unsigned int opt_flags
)
1118 static inline void kill_pending_fw_fallback_reqs(bool only_kill_custom
) { }
1120 #endif /* CONFIG_FW_LOADER_USER_HELPER */
1122 /* prepare firmware and firmware_buf structs;
1123 * return 0 if a firmware is already assigned, 1 if need to load one,
1124 * or a negative error code
1127 _request_firmware_prepare(struct firmware
**firmware_p
, const char *name
,
1128 struct device
*device
, void *dbuf
, size_t size
)
1130 struct firmware
*firmware
;
1131 struct firmware_buf
*buf
;
1134 *firmware_p
= firmware
= kzalloc(sizeof(*firmware
), GFP_KERNEL
);
1136 dev_err(device
, "%s: kmalloc(struct firmware) failed\n",
1141 if (fw_get_builtin_firmware(firmware
, name
, dbuf
, size
)) {
1142 dev_dbg(device
, "using built-in %s\n", name
);
1143 return 0; /* assigned */
1146 ret
= fw_lookup_and_allocate_buf(name
, &fw_cache
, &buf
, dbuf
, size
);
1149 * bind with 'buf' now to avoid warning in failure path
1150 * of requesting firmware.
1152 firmware
->priv
= buf
;
1155 ret
= fw_state_wait(&buf
->fw_st
);
1157 fw_set_page_data(buf
, firmware
);
1158 return 0; /* assigned */
1164 return 1; /* need to load */
1168 * Batched requests need only one wake, we need to do this step last due to the
1169 * fallback mechanism. The buf is protected with kref_get(), and it won't be
1170 * released until the last user calls release_firmware().
1172 * Failed batched requests are possible as well, in such cases we just share
1173 * the struct firmware_buf and won't release it until all requests are woken
1174 * and have gone through this same path.
1176 static void fw_abort_batch_reqs(struct firmware
*fw
)
1178 struct firmware_buf
*buf
;
1180 /* Loaded directly? */
1181 if (!fw
|| !fw
->priv
)
1185 if (!fw_state_is_aborted(&buf
->fw_st
))
1186 fw_state_aborted(&buf
->fw_st
);
1189 /* called from request_firmware() and request_firmware_work_func() */
1191 _request_firmware(const struct firmware
**firmware_p
, const char *name
,
1192 struct device
*device
, void *buf
, size_t size
,
1193 unsigned int opt_flags
)
1195 struct firmware
*fw
= NULL
;
1201 if (!name
|| name
[0] == '\0') {
1206 ret
= _request_firmware_prepare(&fw
, name
, device
, buf
, size
);
1207 if (ret
<= 0) /* error or already assigned */
1210 ret
= fw_get_filesystem_firmware(device
, fw
->priv
);
1212 if (!(opt_flags
& FW_OPT_NO_WARN
))
1214 "Direct firmware load for %s failed with error %d\n",
1216 if (opt_flags
& FW_OPT_USERHELPER
) {
1217 dev_warn(device
, "Falling back to user helper\n");
1218 ret
= fw_load_from_user_helper(fw
, name
, device
,
1222 ret
= assign_firmware_buf(fw
, device
, opt_flags
);
1226 fw_abort_batch_reqs(fw
);
1227 release_firmware(fw
);
1236 * request_firmware: - send firmware request and wait for it
1237 * @firmware_p: pointer to firmware image
1238 * @name: name of firmware file
1239 * @device: device for which firmware is being loaded
1241 * @firmware_p will be used to return a firmware image by the name
1242 * of @name for device @device.
1244 * Should be called from user context where sleeping is allowed.
1246 * @name will be used as $FIRMWARE in the uevent environment and
1247 * should be distinctive enough not to be confused with any other
1248 * firmware image for this or any other device.
1250 * Caller must hold the reference count of @device.
1252 * The function can be called safely inside device's suspend and
1256 request_firmware(const struct firmware
**firmware_p
, const char *name
,
1257 struct device
*device
)
1261 /* Need to pin this module until return */
1262 __module_get(THIS_MODULE
);
1263 ret
= _request_firmware(firmware_p
, name
, device
, NULL
, 0,
1264 FW_OPT_UEVENT
| FW_OPT_FALLBACK
);
1265 module_put(THIS_MODULE
);
1268 EXPORT_SYMBOL(request_firmware
);
1271 * request_firmware_direct: - load firmware directly without usermode helper
1272 * @firmware_p: pointer to firmware image
1273 * @name: name of firmware file
1274 * @device: device for which firmware is being loaded
1276 * This function works pretty much like request_firmware(), but this doesn't
1277 * fall back to usermode helper even if the firmware couldn't be loaded
1278 * directly from fs. Hence it's useful for loading optional firmwares, which
1279 * aren't always present, without extra long timeouts of udev.
1281 int request_firmware_direct(const struct firmware
**firmware_p
,
1282 const char *name
, struct device
*device
)
1286 __module_get(THIS_MODULE
);
1287 ret
= _request_firmware(firmware_p
, name
, device
, NULL
, 0,
1288 FW_OPT_UEVENT
| FW_OPT_NO_WARN
);
1289 module_put(THIS_MODULE
);
1292 EXPORT_SYMBOL_GPL(request_firmware_direct
);
1295 * request_firmware_into_buf - load firmware into a previously allocated buffer
1296 * @firmware_p: pointer to firmware image
1297 * @name: name of firmware file
1298 * @device: device for which firmware is being loaded and DMA region allocated
1299 * @buf: address of buffer to load firmware into
1300 * @size: size of buffer
1302 * This function works pretty much like request_firmware(), but it doesn't
1303 * allocate a buffer to hold the firmware data. Instead, the firmware
1304 * is loaded directly into the buffer pointed to by @buf and the @firmware_p
1305 * data member is pointed at @buf.
1307 * This function doesn't cache firmware either.
1310 request_firmware_into_buf(const struct firmware
**firmware_p
, const char *name
,
1311 struct device
*device
, void *buf
, size_t size
)
1315 __module_get(THIS_MODULE
);
1316 ret
= _request_firmware(firmware_p
, name
, device
, buf
, size
,
1317 FW_OPT_UEVENT
| FW_OPT_FALLBACK
|
1319 module_put(THIS_MODULE
);
1322 EXPORT_SYMBOL(request_firmware_into_buf
);
1325 * release_firmware: - release the resource associated with a firmware image
1326 * @fw: firmware resource to release
1328 void release_firmware(const struct firmware
*fw
)
1331 if (!fw_is_builtin_firmware(fw
))
1332 firmware_free_data(fw
);
1336 EXPORT_SYMBOL(release_firmware
);
1339 struct firmware_work
{
1340 struct work_struct work
;
1341 struct module
*module
;
1343 struct device
*device
;
1345 void (*cont
)(const struct firmware
*fw
, void *context
);
1346 unsigned int opt_flags
;
1349 static void request_firmware_work_func(struct work_struct
*work
)
1351 struct firmware_work
*fw_work
;
1352 const struct firmware
*fw
;
1354 fw_work
= container_of(work
, struct firmware_work
, work
);
1356 _request_firmware(&fw
, fw_work
->name
, fw_work
->device
, NULL
, 0,
1357 fw_work
->opt_flags
);
1358 fw_work
->cont(fw
, fw_work
->context
);
1359 put_device(fw_work
->device
); /* taken in request_firmware_nowait() */
1361 module_put(fw_work
->module
);
1362 kfree_const(fw_work
->name
);
1367 * request_firmware_nowait - asynchronous version of request_firmware
1368 * @module: module requesting the firmware
1369 * @uevent: sends uevent to copy the firmware image if this flag
1370 * is non-zero else the firmware copy must be done manually.
1371 * @name: name of firmware file
1372 * @device: device for which firmware is being loaded
1373 * @gfp: allocation flags
1374 * @context: will be passed over to @cont, and
1375 * @fw may be %NULL if firmware request fails.
1376 * @cont: function will be called asynchronously when the firmware
1379 * Caller must hold the reference count of @device.
1381 * Asynchronous variant of request_firmware() for user contexts:
1382 * - sleep for as small periods as possible since it may
1383 * increase kernel boot time of built-in device drivers
1384 * requesting firmware in their ->probe() methods, if
1385 * @gfp is GFP_KERNEL.
1387 * - can't sleep at all if @gfp is GFP_ATOMIC.
1390 request_firmware_nowait(
1391 struct module
*module
, bool uevent
,
1392 const char *name
, struct device
*device
, gfp_t gfp
, void *context
,
1393 void (*cont
)(const struct firmware
*fw
, void *context
))
1395 struct firmware_work
*fw_work
;
1397 fw_work
= kzalloc(sizeof(struct firmware_work
), gfp
);
1401 fw_work
->module
= module
;
1402 fw_work
->name
= kstrdup_const(name
, gfp
);
1403 if (!fw_work
->name
) {
1407 fw_work
->device
= device
;
1408 fw_work
->context
= context
;
1409 fw_work
->cont
= cont
;
1410 fw_work
->opt_flags
= FW_OPT_NOWAIT
| FW_OPT_FALLBACK
|
1411 (uevent
? FW_OPT_UEVENT
: FW_OPT_USERHELPER
);
1413 if (!try_module_get(module
)) {
1414 kfree_const(fw_work
->name
);
1419 get_device(fw_work
->device
);
1420 INIT_WORK(&fw_work
->work
, request_firmware_work_func
);
1421 schedule_work(&fw_work
->work
);
1424 EXPORT_SYMBOL(request_firmware_nowait
);
1426 #ifdef CONFIG_PM_SLEEP
1427 static ASYNC_DOMAIN_EXCLUSIVE(fw_cache_domain
);
1430 * cache_firmware - cache one firmware image in kernel memory space
1431 * @fw_name: the firmware image name
1433 * Cache firmware in kernel memory so that drivers can use it when
1434 * system isn't ready for them to request firmware image from userspace.
1435 * Once it returns successfully, driver can use request_firmware or its
1436 * nowait version to get the cached firmware without any interacting
1439 * Return 0 if the firmware image has been cached successfully
1440 * Return !0 otherwise
1443 static int cache_firmware(const char *fw_name
)
1446 const struct firmware
*fw
;
1448 pr_debug("%s: %s\n", __func__
, fw_name
);
1450 ret
= request_firmware(&fw
, fw_name
, NULL
);
1454 pr_debug("%s: %s ret=%d\n", __func__
, fw_name
, ret
);
1459 static struct firmware_buf
*fw_lookup_buf(const char *fw_name
)
1461 struct firmware_buf
*tmp
;
1462 struct firmware_cache
*fwc
= &fw_cache
;
1464 spin_lock(&fwc
->lock
);
1465 tmp
= __fw_lookup_buf(fw_name
);
1466 spin_unlock(&fwc
->lock
);
1472 * uncache_firmware - remove one cached firmware image
1473 * @fw_name: the firmware image name
1475 * Uncache one firmware image which has been cached successfully
1478 * Return 0 if the firmware cache has been removed successfully
1479 * Return !0 otherwise
1482 static int uncache_firmware(const char *fw_name
)
1484 struct firmware_buf
*buf
;
1487 pr_debug("%s: %s\n", __func__
, fw_name
);
1489 if (fw_get_builtin_firmware(&fw
, fw_name
, NULL
, 0))
1492 buf
= fw_lookup_buf(fw_name
);
1501 static struct fw_cache_entry
*alloc_fw_cache_entry(const char *name
)
1503 struct fw_cache_entry
*fce
;
1505 fce
= kzalloc(sizeof(*fce
), GFP_ATOMIC
);
1509 fce
->name
= kstrdup_const(name
, GFP_ATOMIC
);
1519 static int __fw_entry_found(const char *name
)
1521 struct firmware_cache
*fwc
= &fw_cache
;
1522 struct fw_cache_entry
*fce
;
1524 list_for_each_entry(fce
, &fwc
->fw_names
, list
) {
1525 if (!strcmp(fce
->name
, name
))
1531 static int fw_cache_piggyback_on_request(const char *name
)
1533 struct firmware_cache
*fwc
= &fw_cache
;
1534 struct fw_cache_entry
*fce
;
1537 spin_lock(&fwc
->name_lock
);
1538 if (__fw_entry_found(name
))
1541 fce
= alloc_fw_cache_entry(name
);
1544 list_add(&fce
->list
, &fwc
->fw_names
);
1545 pr_debug("%s: fw: %s\n", __func__
, name
);
1548 spin_unlock(&fwc
->name_lock
);
1552 static void free_fw_cache_entry(struct fw_cache_entry
*fce
)
1554 kfree_const(fce
->name
);
1558 static void __async_dev_cache_fw_image(void *fw_entry
,
1559 async_cookie_t cookie
)
1561 struct fw_cache_entry
*fce
= fw_entry
;
1562 struct firmware_cache
*fwc
= &fw_cache
;
1565 ret
= cache_firmware(fce
->name
);
1567 spin_lock(&fwc
->name_lock
);
1568 list_del(&fce
->list
);
1569 spin_unlock(&fwc
->name_lock
);
1571 free_fw_cache_entry(fce
);
1575 /* called with dev->devres_lock held */
1576 static void dev_create_fw_entry(struct device
*dev
, void *res
,
1579 struct fw_name_devm
*fwn
= res
;
1580 const char *fw_name
= fwn
->name
;
1581 struct list_head
*head
= data
;
1582 struct fw_cache_entry
*fce
;
1584 fce
= alloc_fw_cache_entry(fw_name
);
1586 list_add(&fce
->list
, head
);
1589 static int devm_name_match(struct device
*dev
, void *res
,
1592 struct fw_name_devm
*fwn
= res
;
1593 return (fwn
->magic
== (unsigned long)match_data
);
1596 static void dev_cache_fw_image(struct device
*dev
, void *data
)
1599 struct fw_cache_entry
*fce
;
1600 struct fw_cache_entry
*fce_next
;
1601 struct firmware_cache
*fwc
= &fw_cache
;
1603 devres_for_each_res(dev
, fw_name_devm_release
,
1604 devm_name_match
, &fw_cache
,
1605 dev_create_fw_entry
, &todo
);
1607 list_for_each_entry_safe(fce
, fce_next
, &todo
, list
) {
1608 list_del(&fce
->list
);
1610 spin_lock(&fwc
->name_lock
);
1611 /* only one cache entry for one firmware */
1612 if (!__fw_entry_found(fce
->name
)) {
1613 list_add(&fce
->list
, &fwc
->fw_names
);
1615 free_fw_cache_entry(fce
);
1618 spin_unlock(&fwc
->name_lock
);
1621 async_schedule_domain(__async_dev_cache_fw_image
,
1627 static void __device_uncache_fw_images(void)
1629 struct firmware_cache
*fwc
= &fw_cache
;
1630 struct fw_cache_entry
*fce
;
1632 spin_lock(&fwc
->name_lock
);
1633 while (!list_empty(&fwc
->fw_names
)) {
1634 fce
= list_entry(fwc
->fw_names
.next
,
1635 struct fw_cache_entry
, list
);
1636 list_del(&fce
->list
);
1637 spin_unlock(&fwc
->name_lock
);
1639 uncache_firmware(fce
->name
);
1640 free_fw_cache_entry(fce
);
1642 spin_lock(&fwc
->name_lock
);
1644 spin_unlock(&fwc
->name_lock
);
1648 * device_cache_fw_images - cache devices' firmware
1650 * If one device called request_firmware or its nowait version
1651 * successfully before, the firmware names are recored into the
1652 * device's devres link list, so device_cache_fw_images can call
1653 * cache_firmware() to cache these firmwares for the device,
1654 * then the device driver can load its firmwares easily at
1655 * time when system is not ready to complete loading firmware.
1657 static void device_cache_fw_images(void)
1659 struct firmware_cache
*fwc
= &fw_cache
;
1663 pr_debug("%s\n", __func__
);
1665 /* cancel uncache work */
1666 cancel_delayed_work_sync(&fwc
->work
);
1669 * use small loading timeout for caching devices' firmware
1670 * because all these firmware images have been loaded
1671 * successfully at lease once, also system is ready for
1672 * completing firmware loading now. The maximum size of
1673 * firmware in current distributions is about 2M bytes,
1674 * so 10 secs should be enough.
1676 old_timeout
= loading_timeout
;
1677 loading_timeout
= 10;
1679 mutex_lock(&fw_lock
);
1680 fwc
->state
= FW_LOADER_START_CACHE
;
1681 dpm_for_each_dev(NULL
, dev_cache_fw_image
);
1682 mutex_unlock(&fw_lock
);
1684 /* wait for completion of caching firmware for all devices */
1685 async_synchronize_full_domain(&fw_cache_domain
);
1687 loading_timeout
= old_timeout
;
1691 * device_uncache_fw_images - uncache devices' firmware
1693 * uncache all firmwares which have been cached successfully
1694 * by device_uncache_fw_images earlier
1696 static void device_uncache_fw_images(void)
1698 pr_debug("%s\n", __func__
);
1699 __device_uncache_fw_images();
1702 static void device_uncache_fw_images_work(struct work_struct
*work
)
1704 device_uncache_fw_images();
1708 * device_uncache_fw_images_delay - uncache devices firmwares
1709 * @delay: number of milliseconds to delay uncache device firmwares
1711 * uncache all devices's firmwares which has been cached successfully
1712 * by device_cache_fw_images after @delay milliseconds.
1714 static void device_uncache_fw_images_delay(unsigned long delay
)
1716 queue_delayed_work(system_power_efficient_wq
, &fw_cache
.work
,
1717 msecs_to_jiffies(delay
));
1720 static int fw_pm_notify(struct notifier_block
*notify_block
,
1721 unsigned long mode
, void *unused
)
1724 case PM_HIBERNATION_PREPARE
:
1725 case PM_SUSPEND_PREPARE
:
1726 case PM_RESTORE_PREPARE
:
1728 * kill pending fallback requests with a custom fallback
1729 * to avoid stalling suspend.
1731 kill_pending_fw_fallback_reqs(true);
1732 device_cache_fw_images();
1735 case PM_POST_SUSPEND
:
1736 case PM_POST_HIBERNATION
:
1737 case PM_POST_RESTORE
:
1739 * In case that system sleep failed and syscore_suspend is
1742 mutex_lock(&fw_lock
);
1743 fw_cache
.state
= FW_LOADER_NO_CACHE
;
1744 mutex_unlock(&fw_lock
);
1746 device_uncache_fw_images_delay(10 * MSEC_PER_SEC
);
1753 /* stop caching firmware once syscore_suspend is reached */
1754 static int fw_suspend(void)
1756 fw_cache
.state
= FW_LOADER_NO_CACHE
;
1760 static struct syscore_ops fw_syscore_ops
= {
1761 .suspend
= fw_suspend
,
1764 static int fw_cache_piggyback_on_request(const char *name
)
1770 static void __init
fw_cache_init(void)
1772 spin_lock_init(&fw_cache
.lock
);
1773 INIT_LIST_HEAD(&fw_cache
.head
);
1774 fw_cache
.state
= FW_LOADER_NO_CACHE
;
1776 #ifdef CONFIG_PM_SLEEP
1777 spin_lock_init(&fw_cache
.name_lock
);
1778 INIT_LIST_HEAD(&fw_cache
.fw_names
);
1780 INIT_DELAYED_WORK(&fw_cache
.work
,
1781 device_uncache_fw_images_work
);
1783 fw_cache
.pm_notify
.notifier_call
= fw_pm_notify
;
1784 register_pm_notifier(&fw_cache
.pm_notify
);
1786 register_syscore_ops(&fw_syscore_ops
);
1790 static int fw_shutdown_notify(struct notifier_block
*unused1
,
1791 unsigned long unused2
, void *unused3
)
1794 * Kill all pending fallback requests to avoid both stalling shutdown,
1795 * and avoid a deadlock with the usermode_lock.
1797 kill_pending_fw_fallback_reqs(false);
1802 static struct notifier_block fw_shutdown_nb
= {
1803 .notifier_call
= fw_shutdown_notify
,
1806 static int __init
firmware_class_init(void)
1809 register_reboot_notifier(&fw_shutdown_nb
);
1810 #ifdef CONFIG_FW_LOADER_USER_HELPER
1811 return class_register(&firmware_class
);
1817 static void __exit
firmware_class_exit(void)
1819 #ifdef CONFIG_PM_SLEEP
1820 unregister_syscore_ops(&fw_syscore_ops
);
1821 unregister_pm_notifier(&fw_cache
.pm_notify
);
1823 unregister_reboot_notifier(&fw_shutdown_nb
);
1824 #ifdef CONFIG_FW_LOADER_USER_HELPER
1825 class_unregister(&firmware_class
);
1829 fs_initcall(firmware_class_init
);
1830 module_exit(firmware_class_exit
);