drivers/auxdisplay/cfag12864b.c

File Facts

System

Linux kernel

Corpus path

drivers/auxdisplay/cfag12864b.c

Extension

.c

Size

7465 bytes

Lines

369

Domain

Driver Families

Bucket

drivers/auxdisplay

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/init.h
• linux/module.h
• linux/kernel.h
• linux/fs.h
• linux/slab.h
• linux/cdev.h
• linux/delay.h
• linux/device.h
• linux/jiffies.h
• linux/mutex.h
• linux/uaccess.h
• linux/vmalloc.h
• linux/workqueue.h
• linux/ks0108.h
• linux/cfag12864b.h

Detected Declarations

• function cfag12864b_set
• function cfag12864b_setbit
• function cfag12864b_e
• function cfag12864b_cs1
• function cfag12864b_cs2
• function cfag12864b_di
• function cfag12864b_setcontrollers
• function cfag12864b_controller
• function cfag12864b_displaystate
• function cfag12864b_address
• function cfag12864b_page
• function cfag12864b_startline
• function cfag12864b_writebyte
• function cfag12864b_nop
• function cfag12864b_on
• function cfag12864b_off
• function cfag12864b_clear
• function cfag12864b_queue
• function cfag12864b_enable
• function cfag12864b_disable
• function cfag12864b_update
• function cfag12864b_isinited
• function cfag12864b_init
• function cfag12864b_exit
• module init cfag12864b_init
• export cfag12864b_buffer
• export cfag12864b_enable
• export cfag12864b_disable
• export cfag12864b_isinited

Annotated Snippet

module_init(cfag12864b_init);
module_exit(cfag12864b_exit);

MODULE_LICENSE("GPL v2");
MODULE_AUTHOR("Miguel Ojeda <ojeda@kernel.org>");
MODULE_DESCRIPTION("cfag12864b LCD driver");

Annotation

• Immediate include surface: `linux/init.h`, `linux/module.h`, `linux/kernel.h`, `linux/fs.h`, `linux/slab.h`, `linux/cdev.h`, `linux/delay.h`, `linux/device.h`.
• Detected declarations: `function cfag12864b_set`, `function cfag12864b_setbit`, `function cfag12864b_e`, `function cfag12864b_cs1`, `function cfag12864b_cs2`, `function cfag12864b_di`, `function cfag12864b_setcontrollers`, `function cfag12864b_controller`, `function cfag12864b_displaystate`, `function cfag12864b_address`.
• Atlas domain: Driver Families / drivers/auxdisplay.
• 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.