get_ec_reg
lsb = get_ec_reg(2, 0x81 + channel);
lsb = get_ec_reg(4, 0x20 + channel);
msb = get_ec_reg(4, 0x21 + channel);
lsb = get_ec_reg(4, 0x40 + channel);
msb = get_ec_reg(4, 0x41 + channel);