drivers/nfc/virtual_ncidev.c

File Facts

System

Linux kernel

Corpus path

drivers/nfc/virtual_ncidev.c

Extension

.c

Size

4699 bytes

Lines

213

Domain

Driver Families

Bucket

drivers/nfc

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

• linux/kernel.h
• linux/module.h
• linux/miscdevice.h
• linux/mutex.h
• linux/wait.h
• net/nfc/nci_core.h

Detected Declarations

• struct virtual_nci_dev
• function virtual_nci_open
• function virtual_nci_close
• function virtual_nci_send
• function virtual_ncidev_read
• function virtual_ncidev_write
• function virtual_ncidev_open
• function virtual_ncidev_close
• function virtual_ncidev_ioctl

Annotated Snippet

static const struct file_operations virtual_ncidev_fops = {
	.owner = THIS_MODULE,
	.read = virtual_ncidev_read,
	.write = virtual_ncidev_write,
	.open = virtual_ncidev_open,
	.release = virtual_ncidev_close,
	.unlocked_ioctl = virtual_ncidev_ioctl
};

static struct miscdevice miscdev = {
	.minor = MISC_DYNAMIC_MINOR,
	.name = "virtual_nci",
	.fops = &virtual_ncidev_fops,
	.mode = 0600,
};

module_misc_device(miscdev);

MODULE_LICENSE("GPL");
MODULE_DESCRIPTION("Virtual NCI device simulation driver");
MODULE_AUTHOR("Bongsu Jeon <bongsu.jeon@samsung.com>");

Annotation

• Immediate include surface: `linux/kernel.h`, `linux/module.h`, `linux/miscdevice.h`, `linux/mutex.h`, `linux/wait.h`, `net/nfc/nci_core.h`.
• Detected declarations: `struct virtual_nci_dev`, `function virtual_nci_open`, `function virtual_nci_close`, `function virtual_nci_send`, `function virtual_ncidev_read`, `function virtual_ncidev_write`, `function virtual_ncidev_open`, `function virtual_ncidev_close`, `function virtual_ncidev_ioctl`.
• Atlas domain: Driver Families / drivers/nfc.
• 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.