drivers/gpio/gpio-pch.c

File Facts

System

Linux kernel

Corpus path

drivers/gpio/gpio-pch.c

Extension

.c

Size

11733 bytes

Lines

455

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.
• Touches IRQ or DMA behavior; this matters for the representative real-device path.
• 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/bits.h
• linux/gpio/driver.h
• linux/interrupt.h
• linux/irq.h
• linux/kernel.h
• linux/module.h
• linux/pci.h
• linux/slab.h

Detected Declarations

• struct pch_regs
• struct pch_gpio_reg_data
• struct pch_gpio
• enum pch_type_t
• function pch_gpio_set
• function pch_gpio_get
• function pch_gpio_direction_output
• function pch_gpio_direction_input
• function pch_gpio_save_reg_conf
• function pch_gpio_restore_reg_conf
• function pch_gpio_to_irq
• function pch_gpio_setup
• function pch_irq_type
• function pch_irq_unmask
• function pch_irq_mask
• function pch_irq_ack
• function pch_gpio_handler
• function pch_gpio_alloc_generic_chip
• function pch_gpio_probe
• function pch_gpio_suspend
• function pch_gpio_resume

Annotated Snippet

static struct pci_driver pch_gpio_driver = {
	.name = "pch_gpio",
	.id_table = pch_gpio_pcidev_id,
	.probe = pch_gpio_probe,
	.driver = {
		.pm = pm_sleep_ptr(&pch_gpio_pm_ops),
	},
};

module_pci_driver(pch_gpio_driver);

MODULE_DESCRIPTION("PCH GPIO PCI Driver");
MODULE_LICENSE("GPL v2");

Annotation

• Immediate include surface: `linux/bits.h`, `linux/gpio/driver.h`, `linux/interrupt.h`, `linux/irq.h`, `linux/kernel.h`, `linux/module.h`, `linux/pci.h`, `linux/slab.h`.
• Detected declarations: `struct pch_regs`, `struct pch_gpio_reg_data`, `struct pch_gpio`, `enum pch_type_t`, `function pch_gpio_set`, `function pch_gpio_get`, `function pch_gpio_direction_output`, `function pch_gpio_direction_input`, `function pch_gpio_save_reg_conf`, `function pch_gpio_restore_reg_conf`.
• 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.
• IRQ or DMA behavior appears here, which is relevant to the selected PCIe/NVMe device path.

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.