cxd2880_convert2s_complement
int cxd2880_convert2s_complement(u32 value, u32 bitlen);
cxd2880_convert2s_complement((data[0] << 8) | data[1], 16);
shift_freq += cxd2880_convert2s_complement(data[0], 8);
*offset = cxd2880_convert2s_complement(ctl_val, 28);
*offset = cxd2880_convert2s_complement(ctl_val, 29);
cxd2880_convert2s_complement((rdata[0] << 3) |