drivers/macintosh/rack-meter.c

File Facts

System

Linux kernel

Corpus path

drivers/macintosh/rack-meter.c

Extension

.c

Size

15704 bytes

Lines

618

Domain

Driver Families

Bucket

drivers/macintosh

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/types.h
• linux/kernel.h
• linux/slab.h
• linux/device.h
• linux/interrupt.h
• linux/module.h
• linux/pci.h
• linux/dma-mapping.h
• linux/kernel_stat.h
• linux/of_address.h
• linux/of_irq.h
• asm/io.h
• asm/machdep.h
• asm/pmac_feature.h
• asm/dbdma.h
• asm/macio.h
• asm/keylargo.h

Detected Declarations

• struct rackmeter_dma
• struct rackmeter_cpu
• struct rackmeter
• function get_cpu_idle_time
• function rackmeter_setup_i2s
• function rackmeter_set_default_pattern
• function rackmeter_do_pause
• function rackmeter_setup_dbdma
• function rackmeter_do_timer
• function rackmeter_init_cpu_sniffer
• function for_each_online_cpu
• function rackmeter_stop_cpu_sniffer
• function rackmeter_setup
• function rackmeter_calc_sample
• function rackmeter_irq
• function rackmeter_probe
• function of_address_to_resource
• function rackmeter_remove
• function rackmeter_shutdown
• function rackmeter_init
• function rackmeter_exit
• module init rackmeter_init

Annotated Snippet

module_init(rackmeter_init);
module_exit(rackmeter_exit);


MODULE_LICENSE("GPL");
MODULE_AUTHOR("Benjamin Herrenschmidt <benh@kernel.crashing.org>");
MODULE_DESCRIPTION("RackMeter: Support vu-meter on XServe front panel");

Annotation

• Immediate include surface: `linux/types.h`, `linux/kernel.h`, `linux/slab.h`, `linux/device.h`, `linux/interrupt.h`, `linux/module.h`, `linux/pci.h`, `linux/dma-mapping.h`.
• Detected declarations: `struct rackmeter_dma`, `struct rackmeter_cpu`, `struct rackmeter`, `function get_cpu_idle_time`, `function rackmeter_setup_i2s`, `function rackmeter_set_default_pattern`, `function rackmeter_do_pause`, `function rackmeter_setup_dbdma`, `function rackmeter_do_timer`, `function rackmeter_init_cpu_sniffer`.
• Atlas domain: Driver Families / drivers/macintosh.
• 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.