drivers/gpio/gpio-stmpe.c

File Facts

System

Linux kernel

Corpus path

drivers/gpio/gpio-stmpe.c

Extension

.c

Size

14832 bytes

Lines

564

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.
• 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/bitops.h
• linux/cleanup.h
• linux/gpio/driver.h
• linux/init.h
• linux/interrupt.h
• linux/mfd/stmpe.h
• linux/property.h
• linux/platform_device.h
• linux/seq_file.h
• linux/slab.h
• linux/string_choices.h

Detected Declarations

• struct stmpe_gpio
• function stmpe_gpio_get
• function stmpe_gpio_set
• function stmpe_gpio_get_direction
• function stmpe_gpio_direction_output
• function stmpe_gpio_direction_input
• function stmpe_gpio_request
• function stmpe_gpio_irq_set_type
• function stmpe_gpio_irq_lock
• function stmpe_gpio_irq_sync_unlock
• function stmpe_gpio_irq_mask
• function stmpe_gpio_irq_unmask
• function stmpe_dbg_show_one
• function stmpe_dbg_show
• function stmpe_gpio_irq
• function stmpe_init_irq_valid_mask
• function stmpe_gpio_disable
• function stmpe_gpio_probe
• function stmpe_gpio_init
• function stmpe_gpio_exit
• module init stmpe_gpio_init

Annotated Snippet

subsys_initcall(stmpe_gpio_init);

static void __exit stmpe_gpio_exit(void)
{
	platform_driver_unregister(&stmpe_gpio_driver);
}
module_exit(stmpe_gpio_exit);

MODULE_DESCRIPTION("STMPE expander GPIO");
MODULE_AUTHOR("Rabin Vincent <rabin.vincent@stericsson.com>");
MODULE_LICENSE("GPL");

Annotation

• Immediate include surface: `linux/bitops.h`, `linux/cleanup.h`, `linux/gpio/driver.h`, `linux/init.h`, `linux/interrupt.h`, `linux/mfd/stmpe.h`, `linux/property.h`, `linux/platform_device.h`.
• Detected declarations: `struct stmpe_gpio`, `function stmpe_gpio_get`, `function stmpe_gpio_set`, `function stmpe_gpio_get_direction`, `function stmpe_gpio_direction_output`, `function stmpe_gpio_direction_input`, `function stmpe_gpio_request`, `function stmpe_gpio_irq_set_type`, `function stmpe_gpio_irq_lock`, `function stmpe_gpio_irq_sync_unlock`.
• 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.
• 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.