pl2303_vendor_write
pl2303_vendor_write(serial, PL2303_HXN_RESET_REG,
pl2303_vendor_write(serial, 8, 0);
pl2303_vendor_write(serial, 9, 0);
ret = pl2303_vendor_write(serial, reg, *buf);
pl2303_vendor_write(serial, 0x0404, 0);
pl2303_vendor_write(serial, 0x0404, 1);
pl2303_vendor_write(serial, 0, 1);
pl2303_vendor_write(serial, 1, 0);
pl2303_vendor_write(serial, 2, 0x24);
pl2303_vendor_write(serial, 2, 0x44);