drivers/counter/intel-qep.c

File Facts

System

Linux kernel

Corpus path

drivers/counter/intel-qep.c

Extension

.c

Size

13182 bytes

Lines

523

Domain

Driver Families

Bucket

drivers/counter

Inferred role

Driver Families: operation-table or driver-model contract

Status

pattern 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.
• Defines an operation table; this is where Linux turns generic core objects into subsystem-specific behavior.
• Uses kernel synchronization; read lock ordering, sleepability, and interrupt context assumptions before translating.
• Defines or uses C structs; map object ownership, embedded links, reference counts, and lock ownership.

Dependency Surface

• linux/counter.h
• linux/kernel.h
• linux/module.h
• linux/mutex.h
• linux/pci.h
• linux/pm_runtime.h

Detected Declarations

• struct intel_qep
• function intel_qep_readl
• function intel_qep_writel
• function intel_qep_init
• function intel_qep_count_read
• function intel_qep_function_read
• function intel_qep_action_read
• function intel_qep_ceiling_read
• function intel_qep_ceiling_write
• function intel_qep_enable_read
• function intel_qep_enable_write
• function intel_qep_spike_filter_ns_read
• function intel_qep_spike_filter_ns_write
• function intel_qep_preset_enable_read
• function intel_qep_preset_enable_write
• function intel_qep_probe
• function intel_qep_remove
• function intel_qep_suspend
• function intel_qep_resume

Annotated Snippet

static struct pci_driver intel_qep_driver = {
	.name = "intel-qep",
	.id_table = intel_qep_id_table,
	.probe = intel_qep_probe,
	.remove = intel_qep_remove,
	.driver = {
		.pm = &intel_qep_pm_ops,
	}
};

module_pci_driver(intel_qep_driver);

MODULE_AUTHOR("Felipe Balbi (Intel)");
MODULE_AUTHOR("Jarkko Nikula <jarkko.nikula@linux.intel.com>");
MODULE_AUTHOR("Raymond Tan <raymond.tan@intel.com>");
MODULE_LICENSE("GPL");
MODULE_DESCRIPTION("Intel Quadrature Encoder Peripheral driver");
MODULE_IMPORT_NS("COUNTER");

Annotation

• Immediate include surface: `linux/counter.h`, `linux/kernel.h`, `linux/module.h`, `linux/mutex.h`, `linux/pci.h`, `linux/pm_runtime.h`.
• Detected declarations: `struct intel_qep`, `function intel_qep_readl`, `function intel_qep_writel`, `function intel_qep_init`, `function intel_qep_count_read`, `function intel_qep_function_read`, `function intel_qep_action_read`, `function intel_qep_ceiling_read`, `function intel_qep_ceiling_write`, `function intel_qep_enable_read`.
• Atlas domain: Driver Families / drivers/counter.
• Implementation status: pattern 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.