drivers/extcon/extcon-rt8973a.c

File Facts

System

Linux kernel

Corpus path

drivers/extcon/extcon-rt8973a.c

Extension

.c

Size

19193 bytes

Lines

712

Domain

Driver Families

Bucket

drivers/extcon

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/err.h
• linux/i2c.h
• linux/input.h
• linux/interrupt.h
• linux/irqdomain.h
• linux/kernel.h
• linux/module.h
• linux/platform_device.h
• linux/regmap.h
• linux/slab.h
• linux/extcon-provider.h
• extcon-rt8973a.h

Detected Declarations

• struct muic_irq
• struct reg_data
• struct rt8973a_muic_info
• enum rt8973a_event_type
• enum rt8973a_muic_acc_type
• function rt8973a_muic_volatile_reg
• function rt8973a_muic_set_path
• function rt8973a_muic_get_cable_type
• function rt8973a_muic_cable_handler
• function rt8973a_muic_irq_work
• function rt8973a_muic_irq_handler
• function rt8973a_muic_detect_cable_wq
• function rt8973a_init_dev_type
• function rt8973a_muic_i2c_probe
• function rt8973a_muic_i2c_remove
• function rt8973a_muic_suspend
• function rt8973a_muic_resume
• function rt8973a_muic_i2c_init
• module init rt8973a_muic_i2c_init

Annotated Snippet

subsys_initcall(rt8973a_muic_i2c_init);

MODULE_DESCRIPTION("Richtek RT8973A Extcon driver");
MODULE_AUTHOR("Chanwoo Choi <cw00.choi@samsung.com>");
MODULE_LICENSE("GPL");

Annotation

• Immediate include surface: `linux/err.h`, `linux/i2c.h`, `linux/input.h`, `linux/interrupt.h`, `linux/irqdomain.h`, `linux/kernel.h`, `linux/module.h`, `linux/platform_device.h`.
• Detected declarations: `struct muic_irq`, `struct reg_data`, `struct rt8973a_muic_info`, `enum rt8973a_event_type`, `enum rt8973a_muic_acc_type`, `function rt8973a_muic_volatile_reg`, `function rt8973a_muic_set_path`, `function rt8973a_muic_get_cable_type`, `function rt8973a_muic_cable_handler`, `function rt8973a_muic_irq_work`.
• Atlas domain: Driver Families / drivers/extcon.
• 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.