drivers/video/fbdev/core/fb_notify.c

Source file repositories/reference/linux-study-clean/drivers/video/fbdev/core/fb_notify.c

File Facts

System
Linux kernel
Corpus path
drivers/video/fbdev/core/fb_notify.c
Extension
.c
Size
1484 bytes
Lines
55
Domain
Driver Families
Bucket
drivers/video
Inferred role
Driver Families: exported/initcall integration point
Status
integration implementation candidate

Why This File Exists

Repeatable hardware-adapter layer. Deep compatibility for every driver is out of scope; this atlas records patterns, probe lifecycles, bus glue, IRQ/DMA usage, and links back to core abstractions.

Dependency Surface

Detected Declarations

Annotated Snippet

#include <linux/fb.h>
#include <linux/notifier.h>
#include <linux/export.h>

static BLOCKING_NOTIFIER_HEAD(fb_notifier_list);

/**
 *	fb_register_client - register a client notifier
 *	@nb: notifier block to callback on events
 *
 *	Return: 0 on success, negative error code on failure.
 */
int fb_register_client(struct notifier_block *nb)
{
	return blocking_notifier_chain_register(&fb_notifier_list, nb);
}
EXPORT_SYMBOL(fb_register_client);

/**
 *	fb_unregister_client - unregister a client notifier
 *	@nb: notifier block to callback on events
 *
 *	Return: 0 on success, negative error code on failure.
 */
int fb_unregister_client(struct notifier_block *nb)
{
	return blocking_notifier_chain_unregister(&fb_notifier_list, nb);
}
EXPORT_SYMBOL(fb_unregister_client);

/**
 * fb_notifier_call_chain - notify clients of fb_events
 * @val: value passed to callback
 * @v: pointer passed to callback
 *
 * Return: The return value of the last notifier function
 */
int fb_notifier_call_chain(unsigned long val, void *v)
{
	return blocking_notifier_call_chain(&fb_notifier_list, val, v);
}
EXPORT_SYMBOL_GPL(fb_notifier_call_chain);

Annotation

Implementation Notes