drivers/gpio/gpio-altera.c

File Facts

System

Linux kernel

Corpus path

drivers/gpio/gpio-altera.c

Extension

.c

Size

7904 bytes

Lines

289

Domain

Driver Families

Bucket

drivers/gpio

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.
• 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/bitops.h
• linux/device.h
• linux/err.h
• linux/io.h
• linux/irq.h
• linux/mod_devicetable.h
• linux/module.h
• linux/platform_device.h
• linux/property.h
• linux/spinlock.h
• linux/types.h
• linux/gpio/driver.h
• linux/gpio/generic.h

Detected Declarations

• struct altera_gpio_chip
• function altera_gpio_irq_unmask
• function altera_gpio_irq_mask
• function altera_gpio_irq_set_type
• function altera_gpio_irq_startup
• function altera_gpio_irq_edge_handler
• function altera_gpio_irq_leveL_high_handler
• function altera_gpio_probe
• function altera_gpio_init
• function altera_gpio_exit
• module init altera_gpio_init

Annotated Snippet

subsys_initcall(altera_gpio_init);

static void __exit altera_gpio_exit(void)
{
	platform_driver_unregister(&altera_gpio_driver);
}
module_exit(altera_gpio_exit);

MODULE_AUTHOR("Tien Hock Loh <thloh@altera.com>");
MODULE_DESCRIPTION("Altera GPIO driver");
MODULE_LICENSE("GPL");

Annotation

• Immediate include surface: `linux/bitops.h`, `linux/device.h`, `linux/err.h`, `linux/io.h`, `linux/irq.h`, `linux/mod_devicetable.h`, `linux/module.h`, `linux/platform_device.h`.
• Detected declarations: `struct altera_gpio_chip`, `function altera_gpio_irq_unmask`, `function altera_gpio_irq_mask`, `function altera_gpio_irq_set_type`, `function altera_gpio_irq_startup`, `function altera_gpio_irq_edge_handler`, `function altera_gpio_irq_leveL_high_handler`, `function altera_gpio_probe`, `function altera_gpio_init`, `function altera_gpio_exit`.
• Atlas domain: Driver Families / drivers/gpio.
• Implementation status: integration 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.