drivers/input/misc/uinput.c

File Facts

System

Linux kernel

Corpus path

drivers/input/misc/uinput.c

Extension

.c

Size

27116 bytes

Lines

1172

Domain

Driver Families

Bucket

drivers/input

Inferred role

Driver Families: operation-table or driver-model contract

Status

pattern 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.

• 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.
• Defines an operation table; this is where Linux turns generic core objects into subsystem-specific behavior.
• Touches user memory; correctness depends on fault-safe copying and privilege boundary handling.
• Uses kernel synchronization; read lock ordering, sleepability, and interrupt context assumptions before translating.
• Allocates kernel memory; connect allocation flags and lifetime to context constraints.
• Defines or uses C structs; map object ownership, embedded links, reference counts, and lock ownership.

Dependency Surface

• uapi/linux/uinput.h
• linux/poll.h
• linux/sched.h
• linux/slab.h
• linux/module.h
• linux/init.h
• linux/fs.h
• linux/lockdep.h
• linux/miscdevice.h
• linux/overflow.h
• linux/spinlock.h
• linux/input/mt.h
• ../input-compat.h

Detected Declarations

• struct uinput_request
• struct uinput_device
• struct uinput_ff_upload_compat
• enum uinput_state
• function uinput_dev_event
• function uinput_request_alloc_id
• function uinput_request_reserve_slot
• function uinput_request_release_slot
• function uinput_request_send
• function uinput_request_submit
• function uinput_flush_requests
• function uinput_dev_set_gain
• function uinput_dev_set_autocenter
• function uinput_dev_playback
• function uinput_dev_upload_effect
• function uinput_dev_erase_effect
• function uinput_dev_flush
• function uinput_destroy_device
• function uinput_create_device
• function uinput_open
• function uinput_validate_absinfo
• function value
• function uinput_validate_absbits
• function for_each_set_bit
• function uinput_dev_setup
• function uinput_abs_setup
• function uinput_setup_device_legacy
• function valid
• function uinput_inject_events
• function uinput_write
• function uinput_fetch_next_event
• function uinput_events_to_user
• function uinput_read
• function uinput_poll
• function uinput_release
• function uinput_ff_upload_to_user
• function uinput_ff_upload_from_user
• function uinput_ff_upload_to_user
• function uinput_ff_upload_from_user
• function uinput_str_to_user
• function uinput_ioctl_handler
• function UI_GET_SYSNAME
• function uinput_ioctl
• function uinput_compat_ioctl

Annotated Snippet

static const struct file_operations uinput_fops = {
	.owner		= THIS_MODULE,
	.open		= uinput_open,
	.release	= uinput_release,
	.read		= uinput_read,
	.write		= uinput_write,
	.poll		= uinput_poll,
	.unlocked_ioctl	= uinput_ioctl,
#ifdef CONFIG_COMPAT
	.compat_ioctl	= uinput_compat_ioctl,
#endif
};

static struct miscdevice uinput_misc = {
	.fops		= &uinput_fops,
	.minor		= UINPUT_MINOR,
	.name		= UINPUT_NAME,
};
module_misc_device(uinput_misc);

MODULE_ALIAS_MISCDEV(UINPUT_MINOR);
MODULE_ALIAS("devname:" UINPUT_NAME);

MODULE_AUTHOR("Aristeu Sergio Rozanski Filho");
MODULE_DESCRIPTION("User level driver support for input subsystem");
MODULE_LICENSE("GPL");

Annotation

• Immediate include surface: `uapi/linux/uinput.h`, `linux/poll.h`, `linux/sched.h`, `linux/slab.h`, `linux/module.h`, `linux/init.h`, `linux/fs.h`, `linux/lockdep.h`.
• Detected declarations: `struct uinput_request`, `struct uinput_device`, `struct uinput_ff_upload_compat`, `enum uinput_state`, `function uinput_dev_event`, `function uinput_request_alloc_id`, `function uinput_request_reserve_slot`, `function uinput_request_release_slot`, `function uinput_request_send`, `function uinput_request_submit`.
• Atlas domain: Driver Families / drivers/input.
• Implementation status: pattern implementation candidate.
• This snippet crosses the user/kernel memory boundary; validate fault handling and access checks before translating the pattern.
• Synchronization appears in or near this file; preserve lock ordering, sleepability, and interrupt-context constraints.

Implementation Notes

• This generated page is the file-by-file coverage layer; curated subsystem chapters should link here when they synthesize a multi-file control flow.
• Core OS pages should be promoted from atlas-only to deep-reviewed when they explain data structures, invariants, locking, lifecycle, and C implementation snippets.
• Driver-family pages are intentionally pattern-oriented unless they are part of the selected PCIe/NVMe representative device path.