MCS_RDREQ
MCS_RDREQ, MCS_RD_RTYPE, 0x0300, MODEM_CONTROL_REGISTER,
usb_rcvctrlpipe(serial->dev, 0), MCS_RDREQ,
MCS_RDREQ, MCS_RD_RTYPE, 0, GPIO_REGISTER, buf,
ret = usb_control_msg(dev, usb_rcvctrlpipe(dev, 0), MCS_RDREQ,
ret = usb_control_msg(dev, usb_rcvctrlpipe(dev, 0), MCS_RDREQ,