drivers/sbus/char/openprom.c

File Facts

System

Linux kernel

Corpus path

drivers/sbus/char/openprom.c

Extension

.c

Size

15312 bytes

Lines

726

Domain

Driver Families

Bucket

drivers/sbus

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/module.h
• linux/kernel.h
• linux/errno.h
• linux/slab.h
• linux/mutex.h
• linux/string.h
• linux/miscdevice.h
• linux/init.h
• linux/fs.h
• asm/oplib.h
• asm/prom.h
• linux/uaccess.h
• asm/openpromio.h
• linux/pci.h

Detected Declarations

• function copyin
• function getstrings
• function copyout
• function opromgetprop
• function opromnxtprop
• function opromsetopt
• function opromnext
• function oprompci2node
• function oprompath2node
• function opromgetbootargs
• function openprom_sunos_ioctl
• function copyin_string
• function opiocget
• function opiocnextprop
• function opiocset
• function opiocgetnext
• function openprom_bsd_ioctl
• function openprom_ioctl
• function openprom_compat_ioctl
• function openprom_open
• function openprom_release
• function openprom_init
• function openprom_cleanup
• module init openprom_init

Annotated Snippet

static const struct file_operations openprom_fops = {
	.owner =	THIS_MODULE,
	.unlocked_ioctl = openprom_ioctl,
	.compat_ioctl =	openprom_compat_ioctl,
	.open =		openprom_open,
	.release =	openprom_release,
};

static struct miscdevice openprom_dev = {
	.minor		= SUN_OPENPROM_MINOR,
	.name		= "openprom",
	.fops		= &openprom_fops,
};

static int __init openprom_init(void)
{
	int err;

	err = misc_register(&openprom_dev);
	if (err)
		return err;

	options_node = of_get_child_by_name(of_find_node_by_path("/"), "options");
	if (!options_node) {
		misc_deregister(&openprom_dev);
		return -EIO;
	}

	return 0;
}

static void __exit openprom_cleanup(void)
{
	misc_deregister(&openprom_dev);
}

module_init(openprom_init);
module_exit(openprom_cleanup);

Annotation

• Immediate include surface: `linux/module.h`, `linux/kernel.h`, `linux/errno.h`, `linux/slab.h`, `linux/mutex.h`, `linux/string.h`, `linux/miscdevice.h`, `linux/init.h`.
• Detected declarations: `function copyin`, `function getstrings`, `function copyout`, `function opromgetprop`, `function opromnxtprop`, `function opromsetopt`, `function opromnext`, `function oprompci2node`, `function oprompath2node`, `function opromgetbootargs`.
• Atlas domain: Driver Families / drivers/sbus.
• 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.