drivers/char/adi.c

File Facts

System

Linux kernel

Corpus path

drivers/char/adi.c

Extension

.c

Size

4446 bytes

Lines

233

Domain

Driver Families

Bucket

drivers/char

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.
• 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/miscdevice.h
• linux/module.h
• linux/proc_fs.h
• linux/slab.h
• linux/uaccess.h
• asm/asi.h

Detected Declarations

• function read_mcd_tag
• function adi_read
• function set_mcd_tag
• function adi_write
• function adi_llseek
• function adi_init
• function adi_exit
• module init adi_init

Annotated Snippet

static const struct file_operations adi_fops = {
	.owner		= THIS_MODULE,
	.llseek		= adi_llseek,
	.read		= adi_read,
	.write		= adi_write,
	.fop_flags	= FOP_UNSIGNED_OFFSET,
};

static struct miscdevice adi_miscdev = {
	.minor = MISC_DYNAMIC_MINOR,
	.name = KBUILD_MODNAME,
	.fops = &adi_fops,
};

static int __init adi_init(void)
{
	if (!adi_capable())
		return -EPERM;

	return misc_register(&adi_miscdev);
}

static void __exit adi_exit(void)
{
	misc_deregister(&adi_miscdev);
}

module_init(adi_init);
module_exit(adi_exit);

MODULE_AUTHOR("Tom Hromatka <tom.hromatka@oracle.com>");
MODULE_DESCRIPTION("Privileged interface to ADI");
MODULE_VERSION("1.0");
MODULE_LICENSE("GPL v2");

Annotation

• Immediate include surface: `linux/kernel.h`, `linux/miscdevice.h`, `linux/module.h`, `linux/proc_fs.h`, `linux/slab.h`, `linux/uaccess.h`, `asm/asi.h`.
• Detected declarations: `function read_mcd_tag`, `function adi_read`, `function set_mcd_tag`, `function adi_write`, `function adi_llseek`, `function adi_init`, `function adi_exit`, `module init adi_init`.
• Atlas domain: Driver Families / drivers/char.
• Implementation status: pattern implementation candidate.
• This snippet crosses the user/kernel memory boundary; validate fault handling and access checks before translating the pattern.

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.