drivers/i2c/busses/i2c-gpio.c

File Facts

System

Linux kernel

Corpus path

drivers/i2c/busses/i2c-gpio.c

Extension

.c

Size

13903 bytes

Lines

509

Domain

Driver Families

Bucket

drivers/i2c

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.
• 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/completion.h
• linux/debugfs.h
• linux/delay.h
• linux/gpio/consumer.h
• linux/i2c-algo-bit.h
• linux/i2c.h
• linux/init.h
• linux/interrupt.h
• linux/module.h
• linux/platform_data/i2c-gpio.h
• linux/platform_device.h
• linux/property.h
• linux/slab.h

Detected Declarations

• struct i2c_gpio_private_data
• function drain
• function i2c_gpio_setscl_val
• function i2c_gpio_getsda
• function i2c_gpio_getscl
• function i2c_gpio_incomplete_transfer
• function fops_incomplete_addr_phase_set
• function fops_incomplete_write_byte_set
• function i2c_gpio_fi_act_on_scl_irq
• function lose_arbitration_irq
• function fops_lose_arbitration_set
• function inject_panic_irq
• function fops_inject_panic_set
• function i2c_gpio_fault_injector_init
• function i2c_gpio_fault_injector_init
• function i2c_gpio_probe
• function i2c_gpio_remove
• function i2c_gpio_init
• function i2c_gpio_exit
• module init i2c_gpio_init

Annotated Snippet

subsys_initcall(i2c_gpio_init);

static void __exit i2c_gpio_exit(void)
{
	platform_driver_unregister(&i2c_gpio_driver);
}
module_exit(i2c_gpio_exit);

MODULE_AUTHOR("Haavard Skinnemoen (Atmel)");
MODULE_DESCRIPTION("Platform-independent bitbanging I2C driver");
MODULE_LICENSE("GPL v2");
MODULE_ALIAS("platform:i2c-gpio");

Annotation

• Immediate include surface: `linux/completion.h`, `linux/debugfs.h`, `linux/delay.h`, `linux/gpio/consumer.h`, `linux/i2c-algo-bit.h`, `linux/i2c.h`, `linux/init.h`, `linux/interrupt.h`.
• Detected declarations: `struct i2c_gpio_private_data`, `function drain`, `function i2c_gpio_setscl_val`, `function i2c_gpio_getsda`, `function i2c_gpio_getscl`, `function i2c_gpio_incomplete_transfer`, `function fops_incomplete_addr_phase_set`, `function fops_incomplete_write_byte_set`, `function i2c_gpio_fi_act_on_scl_irq`, `function lose_arbitration_irq`.
• Atlas domain: Driver Families / drivers/i2c.
• Implementation status: integration implementation candidate.
• 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.