drivers/gpio/gpio-max732x.c

File Facts

System

Linux kernel

Corpus path

drivers/gpio/gpio-max732x.c

Extension

.c

Size

18109 bytes

Lines

737

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/cleanup.h
• linux/err.h
• linux/device.h
• linux/gpio/driver.h
• linux/i2c.h
• linux/init.h
• linux/interrupt.h
• linux/module.h
• linux/mutex.h
• linux/platform_data/max732x.h
• linux/slab.h
• linux/string.h

Detected Declarations

• struct max732x_chip
• function max732x_writeb
• function max732x_readb
• function is_group_a
• function max732x_gpio_get_value
• function max732x_gpio_set_mask
• function max732x_gpio_set_value
• function max732x_gpio_set_multiple
• function max732x_gpio_direction_input
• function max732x_gpio_direction_output
• function max732x_writew
• function max732x_readw
• function max732x_irq_update_mask
• function max732x_irq_mask
• function max732x_irq_unmask
• function max732x_irq_bus_lock
• function max732x_irq_bus_sync_unlock
• function max732x_irq_set_type
• function max732x_irq_set_wake
• function max732x_irq_pending
• function max732x_irq_handler
• function max732x_irq_setup
• function max732x_irq_setup
• function max732x_setup_gpio
• function max732x_probe
• function max732x_init
• function max732x_exit
• module init max732x_init

Annotated Snippet

subsys_initcall(max732x_init);

static void __exit max732x_exit(void)
{
	i2c_del_driver(&max732x_driver);
}
module_exit(max732x_exit);

MODULE_AUTHOR("Eric Miao <eric.miao@marvell.com>");
MODULE_DESCRIPTION("GPIO expander driver for MAX732X");
MODULE_LICENSE("GPL");

Annotation

• Immediate include surface: `linux/cleanup.h`, `linux/err.h`, `linux/device.h`, `linux/gpio/driver.h`, `linux/i2c.h`, `linux/init.h`, `linux/interrupt.h`, `linux/module.h`.
• Detected declarations: `struct max732x_chip`, `function max732x_writeb`, `function max732x_readb`, `function is_group_a`, `function max732x_gpio_get_value`, `function max732x_gpio_set_mask`, `function max732x_gpio_set_value`, `function max732x_gpio_set_multiple`, `function max732x_gpio_direction_input`, `function max732x_gpio_direction_output`.
• 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.