drivers/media/dvb-frontends/cxd2880/cxd2880_common.c

File Facts

System

Linux kernel

Corpus path

drivers/media/dvb-frontends/cxd2880/cxd2880_common.c

Extension

.c

Size

493 bytes

Lines

22

Domain

Driver Families

Bucket

drivers/media

Inferred role

Driver Families: implementation source

Status

source 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.

Dependency Surface

• cxd2880_common.h

Detected Declarations

• function Copyright

Annotated Snippet

// SPDX-License-Identifier: GPL-2.0
/*
 * cxd2880_common.c
 * Sony CXD2880 DVB-T2/T tuner + demodulator driver
 * common functions
 *
 * Copyright (C) 2016, 2017, 2018 Sony Semiconductor Solutions Corporation
 */

#include "cxd2880_common.h"

int cxd2880_convert2s_complement(u32 value, u32 bitlen)
{
	if (!bitlen || bitlen >= 32)
		return (int)value;

	if (value & (u32)(1 << (bitlen - 1)))
		return (int)(GENMASK(31, bitlen) | value);
	else
		return (int)(GENMASK(bitlen - 1, 0) & value);
}

Annotation

• Immediate include surface: `cxd2880_common.h`.
• Detected declarations: `function Copyright`.
• Atlas domain: Driver Families / drivers/media.
• Implementation status: source implementation candidate.

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.