drivers/gpio/gpio-xtensa.c
Source file repositories/reference/linux-study-clean/drivers/gpio/gpio-xtensa.c
File Facts
- System
- Linux kernel
- Corpus path
drivers/gpio/gpio-xtensa.c- Extension
.c- Size
- 4588 bytes
- Lines
- 170
- 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.
- Defines or uses C structs; map object ownership, embedded links, reference counts, and lock ownership.
Dependency Surface
linux/err.hlinux/module.hlinux/gpio/driver.hlinux/bitops.hlinux/platform_device.hasm/coprocessor.h
Detected Declarations
function Copyrightfunction disable_cpfunction enable_cpfunction disable_cpfunction xtensa_impwire_get_valuefunction xtensa_expstate_get_directionfunction xtensa_expstate_get_valuefunction xtensa_expstate_set_valuefunction xtensa_gpio_probefunction xtensa_gpio_initmodule init xtensa_gpio_init
Annotated Snippet
device_initcall(xtensa_gpio_init);
MODULE_AUTHOR("Baruch Siach <baruch@tkos.co.il>");
MODULE_DESCRIPTION("Xtensa LX4 GPIO32 driver");
MODULE_LICENSE("GPL");Annotation
- Immediate include surface: `linux/err.h`, `linux/module.h`, `linux/gpio/driver.h`, `linux/bitops.h`, `linux/platform_device.h`, `asm/coprocessor.h`.
- Detected declarations: `function Copyright`, `function disable_cp`, `function enable_cp`, `function disable_cp`, `function xtensa_impwire_get_value`, `function xtensa_expstate_get_direction`, `function xtensa_expstate_get_value`, `function xtensa_expstate_set_value`, `function xtensa_gpio_probe`, `function xtensa_gpio_init`.
- Atlas domain: Driver Families / drivers/gpio.
- Implementation status: integration implementation candidate.
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.