drivers/media/dvb-frontends/cxd2880/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
  12 int 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 }