drivers/gpio/gpio-wm8994.c
Source file repositories/reference/linux-study-clean/drivers/gpio/gpio-wm8994.c
File Facts
- System
- Linux kernel
- Corpus path
drivers/gpio/gpio-wm8994.c- Extension
.c- Size
- 7606 bytes
- Lines
- 308
- 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.
- 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/cleanup.hlinux/kernel.hlinux/slab.hlinux/module.hlinux/gpio/driver.hlinux/mfd/core.hlinux/platform_device.hlinux/seq_file.hlinux/regmap.hlinux/mfd/wm8994/core.hlinux/mfd/wm8994/pdata.hlinux/mfd/wm8994/gpio.hlinux/mfd/wm8994/registers.h
Detected Declarations
struct wm8994_gpiofunction wm8994_gpio_requestfunction wm8994_gpio_direction_infunction wm8994_gpio_getfunction wm8994_gpio_direction_outfunction wm8994_gpio_setfunction wm8994_gpio_set_configfunction wm8994_gpio_to_irqfunction wm8994_gpio_dbg_showfunction wm8994_gpio_probefunction wm8994_gpio_initfunction wm8994_gpio_exitmodule init wm8994_gpio_init
Annotated Snippet
subsys_initcall(wm8994_gpio_init);
static void __exit wm8994_gpio_exit(void)
{
platform_driver_unregister(&wm8994_gpio_driver);
}
module_exit(wm8994_gpio_exit);
MODULE_AUTHOR("Mark Brown <broonie@opensource.wolfsonmicro.com>");
MODULE_DESCRIPTION("GPIO interface for WM8994");
MODULE_LICENSE("GPL");
MODULE_ALIAS("platform:wm8994-gpio");Annotation
- Immediate include surface: `linux/cleanup.h`, `linux/kernel.h`, `linux/slab.h`, `linux/module.h`, `linux/gpio/driver.h`, `linux/mfd/core.h`, `linux/platform_device.h`, `linux/seq_file.h`.
- Detected declarations: `struct wm8994_gpio`, `function wm8994_gpio_request`, `function wm8994_gpio_direction_in`, `function wm8994_gpio_get`, `function wm8994_gpio_direction_out`, `function wm8994_gpio_set`, `function wm8994_gpio_set_config`, `function wm8994_gpio_to_irq`, `function wm8994_gpio_dbg_show`, `function wm8994_gpio_probe`.
- 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.