cxd2880_common.c

 1// SPDX-License-Identifier: GPL-2.0
 2/*
 3 * cxd2880_common.c
 4 * Sony CXD2880 DVB-T2/T tuner + demodulator driver
 5 * common functions
 6 *
 7 * Copyright (C) 2016, 2017, 2018 Sony Semiconductor Solutions Corporation
 8 */
 9
10#include "cxd2880_common.h"
11
12int cxd2880_convert2s_complement(u32 value, u32 bitlen)
13{
14	if (!bitlen || bitlen >= 32)
15		return (int)value;
16
17	if (value & (u32)(1 << (bitlen - 1)))
18		return (int)(GENMASK(31, bitlen) | value);
19	else
20		return (int)(GENMASK(bitlen - 1, 0) & value);
21}