drivers/gpio/gpio-bt8xx.c

File Facts

System

Linux kernel

Corpus path

drivers/gpio/gpio-bt8xx.c

Extension

.c

Size

6583 bytes

Lines

284

Domain

Driver Families

Bucket

drivers/gpio

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.
• 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/cleanup.h
• linux/module.h
• linux/pci.h
• linux/spinlock.h
• linux/gpio/driver.h
• linux/slab.h
• ../media/pci/bt8xx/bt848.h

Detected Declarations

• struct bt8xxgpio
• function bt8xxgpio_gpio_direction_input
• function bt8xxgpio_gpio_get
• function bt8xxgpio_gpio_direction_output
• function bt8xxgpio_gpio_set
• function bt8xxgpio_gpio_setup
• function bt8xxgpio_probe
• function pci_resource_len
• function bt8xxgpio_remove
• function bt8xxgpio_suspend
• function scoped_guard
• function bt8xxgpio_resume

Annotated Snippet

static struct pci_driver bt8xxgpio_pci_driver = {
	.name		= "bt8xxgpio",
	.id_table	= bt8xxgpio_pci_tbl,
	.probe		= bt8xxgpio_probe,
	.remove		= bt8xxgpio_remove,
	.driver.pm	= &bt8xxgpio_pm_ops,
};

module_pci_driver(bt8xxgpio_pci_driver);

MODULE_LICENSE("GPL");
MODULE_AUTHOR("Michael Buesch");
MODULE_DESCRIPTION("Abuse a BT8xx framegrabber card as generic GPIO card");

Annotation

• Immediate include surface: `linux/cleanup.h`, `linux/module.h`, `linux/pci.h`, `linux/spinlock.h`, `linux/gpio/driver.h`, `linux/slab.h`, `../media/pci/bt8xx/bt848.h`.
• Detected declarations: `struct bt8xxgpio`, `function bt8xxgpio_gpio_direction_input`, `function bt8xxgpio_gpio_get`, `function bt8xxgpio_gpio_direction_output`, `function bt8xxgpio_gpio_set`, `function bt8xxgpio_gpio_setup`, `function bt8xxgpio_probe`, `function pci_resource_len`, `function bt8xxgpio_remove`, `function bt8xxgpio_suspend`.
• Atlas domain: Driver Families / drivers/gpio.
• Implementation status: pattern implementation candidate.
• 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.