18c2ecf20Sopenharmony_ci// SPDX-License-Identifier: GPL-2.0 28c2ecf20Sopenharmony_ci/* 38c2ecf20Sopenharmony_ci * cxd2880_common.c 48c2ecf20Sopenharmony_ci * Sony CXD2880 DVB-T2/T tuner + demodulator driver 58c2ecf20Sopenharmony_ci * common functions 68c2ecf20Sopenharmony_ci * 78c2ecf20Sopenharmony_ci * Copyright (C) 2016, 2017, 2018 Sony Semiconductor Solutions Corporation 88c2ecf20Sopenharmony_ci */ 98c2ecf20Sopenharmony_ci 108c2ecf20Sopenharmony_ci#include "cxd2880_common.h" 118c2ecf20Sopenharmony_ci 128c2ecf20Sopenharmony_ciint cxd2880_convert2s_complement(u32 value, u32 bitlen) 138c2ecf20Sopenharmony_ci{ 148c2ecf20Sopenharmony_ci if (!bitlen || bitlen >= 32) 158c2ecf20Sopenharmony_ci return (int)value; 168c2ecf20Sopenharmony_ci 178c2ecf20Sopenharmony_ci if (value & (u32)(1 << (bitlen - 1))) 188c2ecf20Sopenharmony_ci return (int)(GENMASK(31, bitlen) | value); 198c2ecf20Sopenharmony_ci else 208c2ecf20Sopenharmony_ci return (int)(GENMASK(bitlen - 1, 0) & value); 218c2ecf20Sopenharmony_ci} 22