drivers/i2c/busses/i2c-opal.c

File Facts

System

Linux kernel

Corpus path

drivers/i2c/busses/i2c-opal.c

Extension

.c

Size

6679 bytes

Lines

277

Domain

Driver Families

Bucket

drivers/i2c

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.

• 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.
• Exports symbols or registers init work; inspect boot/module ordering and who consumes the exported contract.
• 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/device.h
• linux/i2c.h
• linux/kernel.h
• linux/mm.h
• linux/module.h
• linux/of.h
• linux/platform_device.h
• linux/slab.h
• asm/firmware.h
• asm/opal.h

Detected Declarations

• function Copyright
• function i2c_opal_send_request
• function i2c_opal_xfer
• function i2c_opal_smbus_xfer
• function i2c_opal_func
• function i2c_opal_probe
• function i2c_opal_remove
• function i2c_opal_init
• function i2c_opal_exit
• module init i2c_opal_init

Annotated Snippet

module_init(i2c_opal_init);

static void __exit i2c_opal_exit(void)
{
	return platform_driver_unregister(&i2c_opal_driver);
}
module_exit(i2c_opal_exit);

MODULE_AUTHOR("Neelesh Gupta <neelegup@linux.vnet.ibm.com>");
MODULE_DESCRIPTION("IBM OPAL I2C driver");
MODULE_LICENSE("GPL");

Annotation

• Immediate include surface: `linux/device.h`, `linux/i2c.h`, `linux/kernel.h`, `linux/mm.h`, `linux/module.h`, `linux/of.h`, `linux/platform_device.h`, `linux/slab.h`.
• Detected declarations: `function Copyright`, `function i2c_opal_send_request`, `function i2c_opal_xfer`, `function i2c_opal_smbus_xfer`, `function i2c_opal_func`, `function i2c_opal_probe`, `function i2c_opal_remove`, `function i2c_opal_init`, `function i2c_opal_exit`, `module init i2c_opal_init`.
• Atlas domain: Driver Families / drivers/i2c.
• Implementation status: integration implementation candidate.

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.