drivers/watchdog/exar_wdt.c

File Facts

System

Linux kernel

Corpus path

drivers/watchdog/exar_wdt.c

Extension

.c

Size

9770 bytes

Lines

430

Domain

Driver Families

Bucket

drivers/watchdog

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.
• 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/io.h
• linux/list.h
• linux/module.h
• linux/platform_device.h
• linux/slab.h
• linux/watchdog.h

Detected Declarations

• struct wdt_pdev_node
• struct wdt_priv
• function exar_sio_enter
• function exar_sio_exit
• function exar_sio_read
• function exar_sio_write
• function exar_sio_read16
• function exar_sio_select_wdt
• function exar_wdt_arm
• function exar_wdt_disarm
• function exar_wdt_start
• function exar_wdt_stop
• function exar_wdt_keepalive
• function exar_wdt_set_timeout
• function exar_wdt_config
• function exar_wdt_probe
• function exar_detect
• function exar_wdt_register
• function exar_wdt_unregister
• function list_for_each_entry_safe
• function exar_wdt_init
• function exar_wdt_exit
• module init exar_wdt_init

Annotated Snippet

module_init(exar_wdt_init);
module_exit(exar_wdt_exit);

MODULE_AUTHOR("David Müller <d.mueller@elsoft.ch>");
MODULE_DESCRIPTION("Exar/MaxLinear Watchdog Driver");
MODULE_LICENSE("GPL");

Annotation

• Immediate include surface: `linux/io.h`, `linux/list.h`, `linux/module.h`, `linux/platform_device.h`, `linux/slab.h`, `linux/watchdog.h`.
• Detected declarations: `struct wdt_pdev_node`, `struct wdt_priv`, `function exar_sio_enter`, `function exar_sio_exit`, `function exar_sio_read`, `function exar_sio_write`, `function exar_sio_read16`, `function exar_sio_select_wdt`, `function exar_wdt_arm`, `function exar_wdt_disarm`.
• Atlas domain: Driver Families / drivers/watchdog.
• Implementation status: integration implementation candidate.
• Synchronization appears in or near this file; preserve lock ordering, sleepability, and interrupt-context constraints.

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.