drivers/gpio/gpio-viperboard.c

File Facts

System

Linux kernel

Corpus path

drivers/gpio/gpio-viperboard.c

Extension

.c

Size

12129 bytes

Lines

480

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/kernel.h
• linux/errno.h
• linux/module.h
• linux/slab.h
• linux/types.h
• linux/mutex.h
• linux/platform_device.h
• linux/usb.h
• linux/gpio/driver.h
• linux/mfd/viperboard.h

Detected Declarations

• struct vprbrd_gpioa_msg
• struct vprbrd_gpiob_msg
• struct vprbrd_gpio
• function vprbrd_gpioa_get
• function vprbrd_gpioa_set
• function vprbrd_gpioa_direction_input
• function vprbrd_gpioa_direction_output
• function vprbrd_gpiob_setdir
• function vprbrd_gpiob_get
• function vprbrd_gpiob_set
• function vprbrd_gpiob_direction_input
• function vprbrd_gpiob_direction_output
• function vprbrd_gpio_probe
• function vprbrd_gpio_init
• function vprbrd_gpio_exit
• module init vprbrd_gpio_init

Annotated Snippet

subsys_initcall(vprbrd_gpio_init);

static void __exit vprbrd_gpio_exit(void)
{
	platform_driver_unregister(&vprbrd_gpio_driver);
}
module_exit(vprbrd_gpio_exit);

MODULE_AUTHOR("Lars Poeschel <poeschel@lemonage.de>");
MODULE_DESCRIPTION("GPIO driver for Nano River Techs Viperboard");
MODULE_LICENSE("GPL");
MODULE_ALIAS("platform:viperboard-gpio");

Annotation

• Immediate include surface: `linux/kernel.h`, `linux/errno.h`, `linux/module.h`, `linux/slab.h`, `linux/types.h`, `linux/mutex.h`, `linux/platform_device.h`, `linux/usb.h`.
• Detected declarations: `struct vprbrd_gpioa_msg`, `struct vprbrd_gpiob_msg`, `struct vprbrd_gpio`, `function vprbrd_gpioa_get`, `function vprbrd_gpioa_set`, `function vprbrd_gpioa_direction_input`, `function vprbrd_gpioa_direction_output`, `function vprbrd_gpiob_setdir`, `function vprbrd_gpiob_get`, `function vprbrd_gpiob_set`.
• 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.