NetBSD-5.0.2/sys/dev/usb/uftdi.c
/* $NetBSD: uftdi.c,v 1.39 2008/09/06 21:42:05 rmind Exp $ */
/*
* Copyright (c) 2000 The NetBSD Foundation, Inc.
* All rights reserved.
*
* This code is derived from software contributed to The NetBSD Foundation
* by Lennart Augustsson (lennart@augustsson.net).
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
* ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
* TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*/
/*
* FTDI FT8U100AX serial adapter driver
*/
#include <sys/cdefs.h>
__KERNEL_RCSID(0, "$NetBSD: uftdi.c,v 1.39 2008/09/06 21:42:05 rmind Exp $");
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/kernel.h>
#include <sys/device.h>
#include <sys/conf.h>
#include <sys/tty.h>
#include <dev/usb/usb.h>
#include <dev/usb/usbdi.h>
#include <dev/usb/usbdi_util.h>
#include <dev/usb/usbdevs.h>
#include <dev/usb/ucomvar.h>
#include <dev/usb/uftdireg.h>
#ifdef UFTDI_DEBUG
#define DPRINTF(x) if (uftdidebug) printf x
#define DPRINTFN(n,x) if (uftdidebug>(n)) printf x
int uftdidebug = 0;
#else
#define DPRINTF(x)
#define DPRINTFN(n,x)
#endif
#define UFTDI_CONFIG_INDEX 0
#define UFTDI_IFACE_INDEX 0
#define UFTDI_MAX_PORTS 2
/*
* These are the maximum number of bytes transferred per frame.
* The output buffer size cannot be increased due to the size encoding.
*/
#define UFTDIIBUFSIZE 64
#define UFTDIOBUFSIZE 64
struct uftdi_softc {
USBBASEDEVICE sc_dev; /* base device */
usbd_device_handle sc_udev; /* device */
usbd_interface_handle sc_iface[UFTDI_MAX_PORTS]; /* interface */
enum uftdi_type sc_type;
u_int sc_hdrlen;
u_int sc_numports;
u_char sc_msr;
u_char sc_lsr;
device_ptr_t sc_subdev[UFTDI_MAX_PORTS];
u_char sc_dying;
u_int last_lcr;
};
Static void uftdi_get_status(void *, int portno, u_char *lsr, u_char *msr);
Static void uftdi_set(void *, int, int, int);
Static int uftdi_param(void *, int, struct termios *);
Static int uftdi_open(void *sc, int portno);
Static void uftdi_read(void *sc, int portno, u_char **ptr,u_int32_t *count);
Static void uftdi_write(void *sc, int portno, u_char *to, u_char *from,
u_int32_t *count);
Static void uftdi_break(void *sc, int portno, int onoff);
struct ucom_methods uftdi_methods = {
uftdi_get_status,
uftdi_set,
uftdi_param,
NULL,
uftdi_open,
NULL,
uftdi_read,
uftdi_write,
};
/*
* The devices default to UFTDI_TYPE_8U232AM.
* Remember to update USB_ATTACH if it should be UFTDI_TYPE_SIO instead
*/
static const struct usb_devno uftdi_devs[] = {
{ USB_VENDOR_BBELECTRONICS, USB_PRODUCT_BBELECTRONICS_USOTL4 },
{ USB_VENDOR_FALCOM, USB_PRODUCT_FALCOM_TWIST },
{ USB_VENDOR_FALCOM, USB_PRODUCT_FALCOM_SAMBA },
{ USB_VENDOR_FTDI, USB_PRODUCT_FTDI_SERIAL_2232C },
{ USB_VENDOR_FTDI, USB_PRODUCT_FTDI_SERIAL_8U100AX },
{ USB_VENDOR_FTDI, USB_PRODUCT_FTDI_SERIAL_8U232AM },
{ USB_VENDOR_FTDI, USB_PRODUCT_FTDI_MHAM_KW },
{ USB_VENDOR_FTDI, USB_PRODUCT_FTDI_MHAM_YS },
{ USB_VENDOR_FTDI, USB_PRODUCT_FTDI_MHAM_Y6 },
{ USB_VENDOR_FTDI, USB_PRODUCT_FTDI_MHAM_Y8 },
{ USB_VENDOR_FTDI, USB_PRODUCT_FTDI_MHAM_IC },
{ USB_VENDOR_FTDI, USB_PRODUCT_FTDI_MHAM_DB9 },
{ USB_VENDOR_FTDI, USB_PRODUCT_FTDI_MHAM_RS232 },
{ USB_VENDOR_FTDI, USB_PRODUCT_FTDI_MHAM_Y9 },
{ USB_VENDOR_FTDI, USB_PRODUCT_FTDI_COASTAL_TNCX },
{ USB_VENDOR_FTDI, USB_PRODUCT_FTDI_SEMC_DSS20 },
{ USB_VENDOR_FTDI, USB_PRODUCT_FTDI_LCD_LK202_24_USB },
{ USB_VENDOR_FTDI, USB_PRODUCT_FTDI_LCD_LK204_24_USB },
{ USB_VENDOR_FTDI, USB_PRODUCT_FTDI_LCD_MX200_USB },
{ USB_VENDOR_FTDI, USB_PRODUCT_FTDI_LCD_MX4_MX5_USB },
{ USB_VENDOR_FTDI, USB_PRODUCT_FTDI_LCD_CFA_631 },
{ USB_VENDOR_FTDI, USB_PRODUCT_FTDI_LCD_CFA_632 },
{ USB_VENDOR_FTDI, USB_PRODUCT_FTDI_LCD_CFA_633 },
{ USB_VENDOR_FTDI, USB_PRODUCT_FTDI_LCD_CFA_634 },
{ USB_VENDOR_FTDI, USB_PRODUCT_FTDI_LCD_CFA_635 },
{ USB_VENDOR_INTREPIDCS, USB_PRODUCT_INTREPIDCS_VALUECAN },
{ USB_VENDOR_INTREPIDCS, USB_PRODUCT_INTREPIDCS_NEOVI },
{ USB_VENDOR_SEALEVEL, USB_PRODUCT_SEALEVEL_USBSERIAL },
{ USB_VENDOR_SEALEVEL, USB_PRODUCT_SEALEVEL_SEAPORT4P1 },
{ USB_VENDOR_SEALEVEL, USB_PRODUCT_SEALEVEL_SEAPORT4P2 },
{ USB_VENDOR_SEALEVEL, USB_PRODUCT_SEALEVEL_SEAPORT4P3 },
{ USB_VENDOR_SEALEVEL, USB_PRODUCT_SEALEVEL_SEAPORT4P4 },
{ USB_VENDOR_SIIG2, USB_PRODUCT_SIIG2_US2308 },
};
#define uftdi_lookup(v, p) usb_lookup(uftdi_devs, v, p)
int uftdi_match(device_t, cfdata_t, void *);
void uftdi_attach(device_t, device_t, void *);
void uftdi_childdet(device_t, device_t);
int uftdi_detach(device_t, int);
int uftdi_activate(device_t, enum devact);
extern struct cfdriver uftdi_cd;
CFATTACH_DECL2_NEW(uftdi, sizeof(struct uftdi_softc), uftdi_match,
uftdi_attach, uftdi_detach, uftdi_activate, NULL, uftdi_childdet);
USB_MATCH(uftdi)
{
USB_MATCH_START(uftdi, uaa);
DPRINTFN(20,("uftdi: vendor=0x%x, product=0x%x\n",
uaa->vendor, uaa->product));
return (uftdi_lookup(uaa->vendor, uaa->product) != NULL ?
UMATCH_VENDOR_PRODUCT : UMATCH_NONE);
}
USB_ATTACH(uftdi)
{
USB_ATTACH_START(uftdi, sc, uaa);
usbd_device_handle dev = uaa->device;
usbd_interface_handle iface;
usb_interface_descriptor_t *id;
usb_endpoint_descriptor_t *ed;
char *devinfop;
const char *devname = device_xname(self);
int i,idx;
usbd_status err;
struct ucom_attach_args uca;
DPRINTFN(10,("\nuftdi_attach: sc=%p\n", sc));
/* Move the device into the configured state. */
err = usbd_set_config_index(dev, UFTDI_CONFIG_INDEX, 1);
if (err) {
aprint_error("\n%s: failed to set configuration, err=%s\n",
devname, usbd_errstr(err));
goto bad;
}
devinfop = usbd_devinfo_alloc(dev, 0);
USB_ATTACH_SETUP;
aprint_normal_dev(self, "%s\n", devinfop);
usbd_devinfo_free(devinfop);
sc->sc_dev = self;
sc->sc_udev = dev;
sc->sc_numports = 1;
switch( uaa->vendor ) {
case USB_VENDOR_FTDI:
switch (uaa->product) {
case USB_PRODUCT_FTDI_SERIAL_8U100AX:
sc->sc_type = UFTDI_TYPE_SIO;
sc->sc_hdrlen = 1;
break;
case USB_PRODUCT_FTDI_SERIAL_2232C:
sc->sc_numports = 2;
/* FALLTHROUGH */
default: /* Most uftdi devices are 8U232AM */
sc->sc_type = UFTDI_TYPE_8U232AM;
sc->sc_hdrlen = 0;
}
break;
default: /* Most uftdi devices are 8U232AM */
sc->sc_type = UFTDI_TYPE_8U232AM;
sc->sc_hdrlen = 0;
}
for (idx = UFTDI_IFACE_INDEX; idx < sc->sc_numports; idx++) {
err = usbd_device2interface_handle(dev, idx, &iface);
if (err) {
aprint_error(
"\n%s: failed to get interface idx=%d, err=%s\n",
devname, idx, usbd_errstr(err));
goto bad;
}
id = usbd_get_interface_descriptor(iface);
sc->sc_iface[idx] = iface;
uca.bulkin = uca.bulkout = -1;
for (i = 0; i < id->bNumEndpoints; i++) {
int addr, dir, attr;
ed = usbd_interface2endpoint_descriptor(iface, i);
if (ed == NULL) {
aprint_error_dev(self,
"could not read endpoint descriptor: %s\n",
usbd_errstr(err));
goto bad;
}
addr = ed->bEndpointAddress;
dir = UE_GET_DIR(ed->bEndpointAddress);
attr = ed->bmAttributes & UE_XFERTYPE;
if (dir == UE_DIR_IN && attr == UE_BULK)
uca.bulkin = addr;
else if (dir == UE_DIR_OUT && attr == UE_BULK)
uca.bulkout = addr;
else {
aprint_error_dev(self,
"unexpected endpoint\n");
goto bad;
}
}
if (uca.bulkin == -1) {
aprint_error_dev(self,
"Could not find data bulk in\n");
goto bad;
}
if (uca.bulkout == -1) {
aprint_error_dev(self,
"Could not find data bulk out\n");
goto bad;
}
uca.portno = FTDI_PIT_SIOA + idx;
/* bulkin, bulkout set above */
uca.ibufsize = UFTDIIBUFSIZE;
uca.obufsize = UFTDIOBUFSIZE - sc->sc_hdrlen;
uca.ibufsizepad = UFTDIIBUFSIZE;
uca.opkthdrlen = sc->sc_hdrlen;
uca.device = dev;
uca.iface = iface;
uca.methods = &uftdi_methods;
uca.arg = sc;
uca.info = NULL;
DPRINTF(("uftdi: in=0x%x out=0x%x\n", uca.bulkin, uca.bulkout));
sc->sc_subdev[idx] = config_found_sm_loc(self, "ucombus", NULL, &uca,
ucomprint, ucomsubmatch);
}
usbd_add_drv_event(USB_EVENT_DRIVER_ATTACH, sc->sc_udev,
USBDEV(sc->sc_dev));
USB_ATTACH_SUCCESS_RETURN;
bad:
DPRINTF(("uftdi_attach: ATTACH ERROR\n"));
sc->sc_dying = 1;
USB_ATTACH_ERROR_RETURN;
}
int
uftdi_activate(device_t self, enum devact act)
{
struct uftdi_softc *sc = device_private(self);
int rv = 0,i;
switch (act) {
case DVACT_ACTIVATE:
return (EOPNOTSUPP);
case DVACT_DEACTIVATE:
for (i=0; i < sc->sc_numports; i++)
if (sc->sc_subdev[i] != NULL)
rv = config_deactivate(sc->sc_subdev[i]);
sc->sc_dying = 1;
break;
}
return (rv);
}
void
uftdi_childdet(device_t self, device_t child)
{
int i;
struct uftdi_softc *sc = device_private(self);
for (i = 0; i < sc->sc_numports; i++) {
if (sc->sc_subdev[i] == child)
break;
}
KASSERT(i < sc->sc_numports);
sc->sc_subdev[i] = NULL;
}
int
uftdi_detach(device_t self, int flags)
{
struct uftdi_softc *sc = device_private(self);
int i;
DPRINTF(("uftdi_detach: sc=%p flags=%d\n", sc, flags));
sc->sc_dying = 1;
for (i=0; i < sc->sc_numports; i++) {
if (sc->sc_subdev[i] != NULL)
config_detach(sc->sc_subdev[i], flags);
}
usbd_add_drv_event(USB_EVENT_DRIVER_DETACH, sc->sc_udev,
USBDEV(sc->sc_dev));
return (0);
}
Static int
uftdi_open(void *vsc, int portno)
{
struct uftdi_softc *sc = vsc;
usb_device_request_t req;
usbd_status err;
struct termios t;
DPRINTF(("uftdi_open: sc=%p\n", sc));
if (sc->sc_dying)
return (EIO);
/* Perform a full reset on the device */
req.bmRequestType = UT_WRITE_VENDOR_DEVICE;
req.bRequest = FTDI_SIO_RESET;
USETW(req.wValue, FTDI_SIO_RESET_SIO);
USETW(req.wIndex, portno);
USETW(req.wLength, 0);
err = usbd_do_request(sc->sc_udev, &req, NULL);
if (err)
return (EIO);
/* Set 9600 baud, 2 stop bits, no parity, 8 bits */
t.c_ospeed = 9600;
t.c_cflag = CSTOPB | CS8;
(void)uftdi_param(sc, portno, &t);
/* Turn on RTS/CTS flow control */
req.bmRequestType = UT_WRITE_VENDOR_DEVICE;
req.bRequest = FTDI_SIO_SET_FLOW_CTRL;
USETW(req.wValue, 0);
USETW2(req.wIndex, FTDI_SIO_RTS_CTS_HS, portno);
USETW(req.wLength, 0);
err = usbd_do_request(sc->sc_udev, &req, NULL);
if (err)
return (EIO);
return (0);
}
Static void
uftdi_read(void *vsc, int portno, u_char **ptr, u_int32_t *count)
{
struct uftdi_softc *sc = vsc;
u_char msr, lsr;
DPRINTFN(15,("uftdi_read: sc=%p, port=%d count=%d\n", sc, portno,
*count));
msr = FTDI_GET_MSR(*ptr);
lsr = FTDI_GET_LSR(*ptr);
#ifdef UFTDI_DEBUG
if (*count != 2)
DPRINTFN(10,("uftdi_read: sc=%p, port=%d count=%d data[0]="
"0x%02x\n", sc, portno, *count, (*ptr)[2]));
#endif
if (sc->sc_msr != msr ||
(sc->sc_lsr & FTDI_LSR_MASK) != (lsr & FTDI_LSR_MASK)) {
DPRINTF(("uftdi_read: status change msr=0x%02x(0x%02x) "
"lsr=0x%02x(0x%02x)\n", msr, sc->sc_msr,
lsr, sc->sc_lsr));
sc->sc_msr = msr;
sc->sc_lsr = lsr;
ucom_status_change(device_private(sc->sc_subdev[portno-1]));
}
/* Pick up status and adjust data part. */
*ptr += 2;
*count -= 2;
}
Static void
uftdi_write(void *vsc, int portno, u_char *to, u_char *from, u_int32_t *count)
{
struct uftdi_softc *sc = vsc;
DPRINTFN(10,("uftdi_write: sc=%p, port=%d count=%u data[0]=0x%02x\n",
vsc, portno, *count, from[0]));
/* Make length tag and copy data */
if (sc->sc_hdrlen > 0)
*to = FTDI_OUT_TAG(*count, portno);
memcpy(to + sc->sc_hdrlen, from, *count);
*count += sc->sc_hdrlen;
}
Static void
uftdi_set(void *vsc, int portno, int reg, int onoff)
{
struct uftdi_softc *sc = vsc;
usb_device_request_t req;
int ctl;
DPRINTF(("uftdi_set: sc=%p, port=%d reg=%d onoff=%d\n", vsc, portno,
reg, onoff));
switch (reg) {
case UCOM_SET_DTR:
ctl = onoff ? FTDI_SIO_SET_DTR_HIGH : FTDI_SIO_SET_DTR_LOW;
break;
case UCOM_SET_RTS:
ctl = onoff ? FTDI_SIO_SET_RTS_HIGH : FTDI_SIO_SET_RTS_LOW;
break;
case UCOM_SET_BREAK:
uftdi_break(sc, portno, onoff);
return;
default:
return;
}
req.bmRequestType = UT_WRITE_VENDOR_DEVICE;
req.bRequest = FTDI_SIO_MODEM_CTRL;
USETW(req.wValue, ctl);
USETW(req.wIndex, portno);
USETW(req.wLength, 0);
DPRINTFN(2,("uftdi_set: reqtype=0x%02x req=0x%02x value=0x%04x "
"index=0x%04x len=%d\n", req.bmRequestType, req.bRequest,
UGETW(req.wValue), UGETW(req.wIndex), UGETW(req.wLength)));
(void)usbd_do_request(sc->sc_udev, &req, NULL);
}
Static int
uftdi_param(void *vsc, int portno, struct termios *t)
{
struct uftdi_softc *sc = vsc;
usb_device_request_t req;
usbd_status err;
int rate, data, flow;
DPRINTF(("uftdi_param: sc=%p\n", sc));
if (sc->sc_dying)
return (EIO);
switch (sc->sc_type) {
case UFTDI_TYPE_SIO:
switch (t->c_ospeed) {
case 300: rate = ftdi_sio_b300; break;
case 600: rate = ftdi_sio_b600; break;
case 1200: rate = ftdi_sio_b1200; break;
case 2400: rate = ftdi_sio_b2400; break;
case 4800: rate = ftdi_sio_b4800; break;
case 9600: rate = ftdi_sio_b9600; break;
case 19200: rate = ftdi_sio_b19200; break;
case 38400: rate = ftdi_sio_b38400; break;
case 57600: rate = ftdi_sio_b57600; break;
case 115200: rate = ftdi_sio_b115200; break;
default:
return (EINVAL);
}
break;
case UFTDI_TYPE_8U232AM:
switch(t->c_ospeed) {
case 300: rate = ftdi_8u232am_b300; break;
case 600: rate = ftdi_8u232am_b600; break;
case 1200: rate = ftdi_8u232am_b1200; break;
case 2400: rate = ftdi_8u232am_b2400; break;
case 4800: rate = ftdi_8u232am_b4800; break;
case 9600: rate = ftdi_8u232am_b9600; break;
case 19200: rate = ftdi_8u232am_b19200; break;
case 38400: rate = ftdi_8u232am_b38400; break;
case 57600: rate = ftdi_8u232am_b57600; break;
case 115200: rate = ftdi_8u232am_b115200; break;
case 230400: rate = ftdi_8u232am_b230400; break;
case 460800: rate = ftdi_8u232am_b460800; break;
case 921600: rate = ftdi_8u232am_b921600; break;
default:
return (EINVAL);
}
break;
default:
return (EINVAL);
}
req.bmRequestType = UT_WRITE_VENDOR_DEVICE;
req.bRequest = FTDI_SIO_SET_BAUD_RATE;
USETW(req.wValue, rate);
USETW(req.wIndex, portno);
USETW(req.wLength, 0);
DPRINTFN(2,("uftdi_param: reqtype=0x%02x req=0x%02x value=0x%04x "
"index=0x%04x len=%d\n", req.bmRequestType, req.bRequest,
UGETW(req.wValue), UGETW(req.wIndex), UGETW(req.wLength)));
err = usbd_do_request(sc->sc_udev, &req, NULL);
if (err)
return (EIO);
if (ISSET(t->c_cflag, CSTOPB))
data = FTDI_SIO_SET_DATA_STOP_BITS_2;
else
data = FTDI_SIO_SET_DATA_STOP_BITS_1;
if (ISSET(t->c_cflag, PARENB)) {
if (ISSET(t->c_cflag, PARODD))
data |= FTDI_SIO_SET_DATA_PARITY_ODD;
else
data |= FTDI_SIO_SET_DATA_PARITY_EVEN;
} else
data |= FTDI_SIO_SET_DATA_PARITY_NONE;
switch (ISSET(t->c_cflag, CSIZE)) {
case CS5:
data |= FTDI_SIO_SET_DATA_BITS(5);
break;
case CS6:
data |= FTDI_SIO_SET_DATA_BITS(6);
break;
case CS7:
data |= FTDI_SIO_SET_DATA_BITS(7);
break;
case CS8:
data |= FTDI_SIO_SET_DATA_BITS(8);
break;
}
sc->last_lcr = data;
req.bmRequestType = UT_WRITE_VENDOR_DEVICE;
req.bRequest = FTDI_SIO_SET_DATA;
USETW(req.wValue, data);
USETW(req.wIndex, portno);
USETW(req.wLength, 0);
DPRINTFN(2,("uftdi_param: reqtype=0x%02x req=0x%02x value=0x%04x "
"index=0x%04x len=%d\n", req.bmRequestType, req.bRequest,
UGETW(req.wValue), UGETW(req.wIndex), UGETW(req.wLength)));
err = usbd_do_request(sc->sc_udev, &req, NULL);
if (err)
return (EIO);
if (ISSET(t->c_cflag, CRTSCTS)) {
flow = FTDI_SIO_RTS_CTS_HS;
USETW(req.wValue, 0);
} else if (ISSET(t->c_iflag, IXON|IXOFF)) {
flow = FTDI_SIO_XON_XOFF_HS;
USETW2(req.wValue, t->c_cc[VSTOP], t->c_cc[VSTART]);
} else {
flow = FTDI_SIO_DISABLE_FLOW_CTRL;
USETW(req.wValue, 0);
}
req.bmRequestType = UT_WRITE_VENDOR_DEVICE;
req.bRequest = FTDI_SIO_SET_FLOW_CTRL;
USETW2(req.wIndex, flow, portno);
USETW(req.wLength, 0);
err = usbd_do_request(sc->sc_udev, &req, NULL);
if (err)
return (EIO);
return (0);
}
void
uftdi_get_status(void *vsc, int portno, u_char *lsr, u_char *msr)
{
struct uftdi_softc *sc = vsc;
DPRINTF(("uftdi_status: msr=0x%02x lsr=0x%02x\n",
sc->sc_msr, sc->sc_lsr));
if (msr != NULL)
*msr = sc->sc_msr;
if (lsr != NULL)
*lsr = sc->sc_lsr;
}
void
uftdi_break(void *vsc, int portno, int onoff)
{
struct uftdi_softc *sc = vsc;
usb_device_request_t req;
int data;
DPRINTF(("uftdi_break: sc=%p, port=%d onoff=%d\n", vsc, portno,
onoff));
if (onoff) {
data = sc->last_lcr | FTDI_SIO_SET_BREAK;
} else {
data = sc->last_lcr;
}
req.bmRequestType = UT_WRITE_VENDOR_DEVICE;
req.bRequest = FTDI_SIO_SET_DATA;
USETW(req.wValue, data);
USETW(req.wIndex, portno);
USETW(req.wLength, 0);
(void)usbd_do_request(sc->sc_udev, &req, NULL);
}