usbsacm_req_write
usbsacm_req_write(acm_port, USB_CDC_REQ_SET_CONTROL_LINE_STATE,
return (usbsacm_req_write(acm_port, USB_CDC_REQ_SEND_BREAK,
ret = usbsacm_req_write(acm_port, USB_CDC_REQ_SET_LINE_CODING, 0, &bp);
static int usbsacm_req_write(usbsacm_port_t *, uchar_t, uint16_t,