Driver for MosChip Semiconductor 78x0 USB multiport serial adapters.

Ported from FreeBSD via NetBSD, tested on a ST Lab U-400 provided by
weerd@.

ok jsg@

1 files changed, 806 insertions, 0 deletions

diff --git a/sys/dev/usb/umcs.c b/sys/dev/usb/umcs.c
new file mode 100644
index 00000000000..96de4a044ce
--- /dev/null
+++ b/sys/dev/usb/umcs.c
@@ -0,0 +1,806 @@
+/* $OpenBSD: umcs.c,v 1.1 2014/12/04 11:05:26 mpi Exp $ */
+/* $NetBSD: umcs.c,v 1.8 2014/08/23 21:37:56 martin Exp $ */
+/* $FreeBSD: head/sys/dev/usb/serial/umcs.c 260559 2014-01-12 11:44:28Z hselasky $ */
+
+/*-
+ * Copyright (c) 2010 Lev Serebryakov <lev@FreeBSD.org>.
+ * All rights reserved.
+ *
+ * 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 AUTHOR 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 AUTHOR 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.
+ */
+
+/*
+ * This driver supports several multiport USB-to-RS232 serial adapters driven
+ * by MosChip mos7820 and mos7840, bridge chips.  The adapters are sold under
+ * many different brand names.
+ *
+ * Datasheets are available at MosChip www site at http://www.moschip.com.
+ * The datasheets don't contain full programming information for the chip.
+ *
+ * It is nornal to have only two enabled ports in devices, based on quad-port
+ * mos7840.
+ */
+
+#include <sys/param.h>
+#include <sys/systm.h>
+#include <sys/kernel.h>
+#include <sys/malloc.h>
+#include <sys/conf.h>
+#include <sys/tty.h>
+#include <sys/device.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 "umcs.h"
+
+#ifdef UMCS_DEBUG
+#define	DPRINTF(x...)	printf(x)
+#else
+#define	DPRINTF(x...)
+#endif
+
+#define DEVNAME(_sc) ((_sc)->sc_dev.dv_xname)
+
+/*
+ * Two-port devices (both with 7820 chip and 7840 chip configured as two-port)
+ * have ports 0 and 2, with ports 1 and 3 omitted.
+ * So, PHYSICAL port numbers on two-port device will be 0 and 2.
+ *
+ * We use an array of the following struct, indexed by ucom port index,
+ * and include the physical port number in it.
+ */
+struct umcs_port {
+	struct ucom_softc 	*ucom;		/* ucom subdevice */
+	unsigned int		 pn;		/* physical port number */
+	uint8_t			 lcr;		/* local line control reg. */
+	uint8_t			 mcr;		/* local modem control reg. */
+};
+
+struct umcs_softc {
+	struct device		 sc_dev;
+	struct usbd_interface	*sc_iface;	/* the usb interface */
+	struct usbd_device	*sc_udev;	/* the usb device */
+	struct usbd_pipe	*sc_ipipe;	/* interrupt pipe */
+	uint8_t			*sc_ibuf;	/* buffer for interrupt xfer */
+	unsigned int		 sc_isize;	/* size of buffer */
+
+	struct umcs_port	 sc_subdevs[UMCS_MAX_PORTS];
+	uint8_t			 sc_numports;	/* number of ports */
+
+	int			 sc_init_done;
+};
+
+int	umcs_get_reg(struct umcs_softc *, uint8_t, uint8_t *);
+int	umcs_set_reg(struct umcs_softc *, uint8_t, uint8_t);
+int	umcs_get_uart_reg(struct umcs_softc *, uint8_t, uint8_t, uint8_t *);
+int	umcs_set_uart_reg(struct umcs_softc *, uint8_t, uint8_t, uint8_t);
+int	umcs_calc_baudrate(uint32_t, uint16_t *, uint8_t *);
+int	umcs_set_baudrate(struct umcs_softc *, uint8_t, uint32_t);
+void	umcs_dtr(struct umcs_softc *, int, int);
+void	umcs_rts(struct umcs_softc *, int, int);
+void	umcs_break(struct umcs_softc *, int, int);
+
+int	umcs_match(struct device *, void *, void *);
+void	umcs_attach(struct device *, struct device *, void *);
+int	umcs_detach(struct device *, int);
+void	umcs_intr(struct usbd_xfer *, void *, usbd_status);
+
+void	umcs_get_status(void *, int, uint8_t *, uint8_t *);
+void	umcs_set(void *, int, int, int);
+int	umcs_param(void *, int, struct termios *);
+int	umcs_open(void *, int);
+void	umcs_close(void *, int);
+
+struct ucom_methods umcs_methods = {
+	umcs_get_status,
+	umcs_set,
+	umcs_param,
+	NULL,
+	umcs_open,
+	umcs_close,
+	NULL,
+	NULL,
+};
+
+const struct usb_devno umcs_devs[] = {
+	{ USB_VENDOR_MOSCHIP,		USB_PRODUCT_MOSCHIP_MCS7810 },
+	{ USB_VENDOR_MOSCHIP,		USB_PRODUCT_MOSCHIP_MCS7820 },
+	{ USB_VENDOR_MOSCHIP,		USB_PRODUCT_MOSCHIP_MCS7840 },
+	{ USB_VENDOR_ATEN,		USB_PRODUCT_ATEN_UC2324 }
+};
+
+struct cfdriver umcs_cd = {
+	NULL, "umcs", DV_DULL
+};
+
+const struct cfattach umcs_ca = {
+	sizeof(struct umcs_softc), umcs_match, umcs_attach, umcs_detach
+};
+
+
+static inline int
+umcs_reg_sp(int pn)
+{
+	KASSERT(pn >= 0 && pn < 4);
+	switch (pn) {
+	default:
+	case 0:	return UMCS_SP1;
+	case 1:	return UMCS_SP2;
+	case 2:	return UMCS_SP3;
+	case 3:	return UMCS_SP4;
+	}
+}
+
+static inline int
+umcs_reg_ctrl(int pn)
+{
+	KASSERT(pn >= 0 && pn < 4);
+	switch (pn) {
+	default:
+	case 0:	return UMCS_CTRL1;
+	case 1:	return UMCS_CTRL2;
+	case 2:	return UMCS_CTRL3;
+	case 3:	return UMCS_CTRL4;
+	}
+}
+
+int
+umcs_match(struct device *dev, void *match, void *aux)
+{
+	struct usb_attach_arg *uaa = aux;
+
+	return (usb_lookup(umcs_devs, uaa->vendor, uaa->product) != NULL) ?
+	    UMATCH_VENDOR_PRODUCT : UMATCH_NONE;
+}
+
+void
+umcs_attach(struct device *parent, struct device *self, void *aux)
+{
+	struct umcs_softc *sc = (struct umcs_softc *)self;
+	struct usb_attach_arg *uaa = aux;
+	usb_interface_descriptor_t *id;
+	usb_endpoint_descriptor_t *ed;
+	struct ucom_attach_args uca;
+	int error, i, intr_addr;
+	uint8_t data;
+
+	sc->sc_udev = uaa->device;
+
+	if (usbd_set_config_index(sc->sc_udev, UMCS_CONFIG_NO, 1) != 0) {
+		printf("%s: could not set configuration no\n", DEVNAME(sc));
+		usbd_deactivate(sc->sc_udev);
+		return;
+	}
+
+	/* Get the first interface handle */
+	error = usbd_device2interface_handle(sc->sc_udev, UMCS_IFACE_NO,
+	    &sc->sc_iface);
+	if (error != 0) {
+		printf("%s: could not get interface handle\n", DEVNAME(sc));
+		usbd_deactivate(sc->sc_udev);
+		return;
+	}
+
+	/*
+	 * Get number of ports
+	 * Documentation (full datasheet) says, that number of ports is
+	 * set as UMCS_MODE_SELECT24S bit in MODE R/Only
+	 * register. But vendor driver uses these undocumented
+	 * register & bit.
+	 *
+	 * Experiments show, that MODE register can have `0'
+	 * (4 ports) bit on 2-port device, so use vendor driver's way.
+	 *
+	 * Also, see notes in header file for these constants.
+	 */
+	umcs_get_reg(sc, UMCS_GPIO, &data);
+	if (data & UMCS_GPIO_4PORTS)
+		sc->sc_numports = 4; /* physical port no are : 0, 1, 2, 3 */
+	else if (uaa->product == USB_PRODUCT_MOSCHIP_MCS7810)
+		sc->sc_numports = 1;
+	else
+		sc->sc_numports = 2; /* physical port no are: 0 and 2 */
+
+#ifdef UMCS_DEBUG
+	if (!umcs_get_reg(sc, UMCS_MODE, &data)) {
+		printf("%s: On-die confguration: RST: active %s, "
+		    "HRD: %s, PLL: %s, POR: %s, Ports: %s, EEPROM write %s, "
+		    "IrDA is %savailable\n", DEVNAME(sc),
+		    (data & UMCS_MODE_RESET) ? "low" : "high",
+		    (data & UMCS_MODE_SER_PRSNT) ? "yes" : "no",
+		    (data & UMCS_MODE_PLLBYPASS) ? "bypassed" : "avail",
+		    (data & UMCS_MODE_PORBYPASS) ? "bypassed" : "avail",
+		    (data & UMCS_MODE_SELECT24S) ? "2" : "4",
+		    (data & UMCS_MODE_EEPROMWR) ? "enabled" : "disabled",
+		    (data & UMCS_MODE_IRDA) ? "" : "not ");
+	}
+#endif
+
+	/* Set up the interrupt pipe */
+	id = usbd_get_interface_descriptor(sc->sc_iface);
+	intr_addr = -1;
+	for (i = 0 ; i < id->bNumEndpoints ; i++) {
+		ed = usbd_interface2endpoint_descriptor(sc->sc_iface, i);
+		if (ed == NULL) {
+			printf("%s: no endpoint descriptor found for %d\n",
+			    DEVNAME(sc), i);
+			usbd_deactivate(sc->sc_udev);
+			return;
+		}
+
+		if (UE_GET_DIR(ed->bEndpointAddress) != UE_DIR_IN ||
+		    UE_GET_XFERTYPE(ed->bmAttributes) != UE_INTERRUPT)
+			continue;
+		sc->sc_isize = UGETW(ed->wMaxPacketSize);
+		intr_addr = ed->bEndpointAddress;
+		break;
+	}
+	if (intr_addr < 0) {
+		printf("%s: missing endpoint\n", DEVNAME(sc));
+		usbd_deactivate(sc->sc_udev);
+		return;
+	}
+	sc->sc_ibuf = malloc(sc->sc_isize, M_USBDEV, M_WAITOK);
+
+	error = usbd_open_pipe_intr(sc->sc_iface, intr_addr,
+		    USBD_SHORT_XFER_OK, &sc->sc_ipipe, sc, sc->sc_ibuf,
+		    sc->sc_isize, umcs_intr, 100 /* XXX */);
+	if (error) {
+		printf("%s: cannot open interrupt pipe (addr %d)\n",
+		    DEVNAME(sc), intr_addr);
+		usbd_deactivate(sc->sc_udev);
+		return;
+	}
+
+	memset(&uca, 0, sizeof uca);
+	uca.ibufsize = 256;
+	uca.obufsize = 256;
+	uca.ibufsizepad = 256;
+	uca.opkthdrlen = 0;
+	uca.device = sc->sc_udev;
+	uca.iface = sc->sc_iface;
+	uca.methods = &umcs_methods;
+	uca.arg = sc;
+
+	for (i = 0; i < sc->sc_numports; i++) {
+		uca.bulkin = uca.bulkout = -1;
+
+		/*
+		 * On 4 port cards, endpoints are 0/1, 2/3, 4/5, and 6/7.
+		 * On 2 port cards, they are 0/1 and 4/5.
+		 * On single port, just 0/1 will be used.
+		 */
+		int pn = i * (sc->sc_numports == 2 ? 2 : 1);
+
+		ed = usbd_interface2endpoint_descriptor(sc->sc_iface, pn*2);
+		if (ed == NULL) {
+			printf("%s: no bulk in endpoint found for %d\n",
+			    DEVNAME(sc), i);
+			usbd_deactivate(sc->sc_udev);
+			return;
+		}
+		uca.bulkin = ed->bEndpointAddress;
+
+		ed = usbd_interface2endpoint_descriptor(sc->sc_iface, pn*2+1);
+		if (ed == NULL) {
+			printf("%s: no bulk out endpoint found for %d\n",
+			    DEVNAME(sc), i);
+			usbd_deactivate(sc->sc_udev);
+			return;
+		}
+		uca.bulkout = ed->bEndpointAddress;
+		uca.portno = i;
+
+		sc->sc_subdevs[i].pn = pn;
+		sc->sc_subdevs[i].ucom = (struct ucom_softc *)
+		    config_found_sm(self, &uca, ucomprint, ucomsubmatch);
+	}
+}
+
+int
+umcs_get_reg(struct umcs_softc *sc, uint8_t reg, uint8_t *data)
+{
+	usb_device_request_t req;
+
+	req.bmRequestType = UT_READ_VENDOR_DEVICE;
+	req.bRequest = UMCS_READ;
+	USETW(req.wValue, 0);
+	USETW(req.wIndex, reg);
+	USETW(req.wLength, UMCS_READ_LENGTH);
+
+	if (usbd_do_request(sc->sc_udev, &req, data))
+		return (EIO);
+
+	return (0);
+}
+
+int
+umcs_set_reg(struct umcs_softc *sc, uint8_t reg, uint8_t data)
+{
+	usb_device_request_t req;
+
+	req.bmRequestType = UT_WRITE_VENDOR_DEVICE;
+	req.bRequest = UMCS_WRITE;
+	USETW(req.wValue, data);
+	USETW(req.wIndex, reg);
+	USETW(req.wLength, 0);
+
+	if (usbd_do_request(sc->sc_udev, &req, NULL))
+		return (EIO);
+
+	return (0);
+}
+
+int
+umcs_get_uart_reg(struct umcs_softc *sc, uint8_t portno, uint8_t reg,
+    uint8_t *data)
+{
+	usb_device_request_t req;
+	uint16_t wVal;
+
+	wVal = ((uint16_t)(sc->sc_subdevs[portno].pn + 1)) << 8;
+
+	req.bmRequestType = UT_READ_VENDOR_DEVICE;
+	req.bRequest = UMCS_READ;
+	USETW(req.wValue, wVal);
+	USETW(req.wIndex, reg);
+	USETW(req.wLength, UMCS_READ_LENGTH);
+
+	if (usbd_do_request(sc->sc_udev, &req, data))
+		return (EIO);
+
+	return (0);
+}
+
+int
+umcs_set_uart_reg(struct umcs_softc *sc, uint8_t portno, uint8_t reg,
+    uint8_t data)
+{
+	usb_device_request_t req;
+	uint16_t wVal;
+
+	wVal = ((uint16_t)(sc->sc_subdevs[portno].pn + 1)) << 8 | data;
+
+	req.bmRequestType = UT_WRITE_VENDOR_DEVICE;
+	req.bRequest = UMCS_WRITE;
+	USETW(req.wValue, wVal);
+	USETW(req.wIndex, reg);
+	USETW(req.wLength, 0);
+
+	if (usbd_do_request(sc->sc_udev, &req, NULL))
+		return (EIO);
+
+	return (0);
+}
+
+int
+umcs_set_baudrate(struct umcs_softc *sc, uint8_t portno, uint32_t rate)
+{
+	int pn = sc->sc_subdevs[portno].pn;
+	int spreg = umcs_reg_sp(pn);
+	uint8_t lcr = sc->sc_subdevs[portno].lcr;
+	uint8_t clk, data;
+	uint16_t div;
+
+	if (umcs_calc_baudrate(rate, &div, &clk))
+		return (EINVAL);
+
+	DPRINTF("%s: portno %d set speed: %d (%02x/%d)\n", DEVNAME(sc), portno,
+	    rate, clk, div);
+
+	/* Set clock source for standard BAUD frequences */
+	if (umcs_get_reg(sc, spreg, &data))
+		return (EIO);
+	data &= UMCS_SPx_CLK_MASK;
+	if (umcs_set_reg(sc, spreg, data | clk))
+		return (EIO);
+
+	/* Set divider */
+	lcr |= UMCS_LCR_DIVISORS;
+	if (umcs_set_uart_reg(sc, portno, UMCS_REG_LCR, lcr))
+		return (EIO);
+	sc->sc_subdevs[portno].lcr = lcr;
+
+	if (umcs_set_uart_reg(sc, portno, UMCS_REG_DLL, div & 0xff) ||
+	    umcs_set_uart_reg(sc, portno, UMCS_REG_DLM, (div >> 8) & 0xff))
+		return (EIO);
+
+	/* Turn off access to DLL/DLM registers of UART */
+	lcr &= ~UMCS_LCR_DIVISORS;
+	if (umcs_set_uart_reg(sc, portno, UMCS_REG_LCR, lcr))
+		return (EIO);
+	sc->sc_subdevs[portno].lcr = lcr;
+
+	return (0);
+}
+
+/* Maximum speeds for standard frequences, when PLL is not used */
+static const uint32_t umcs_baudrate_divisors[] = {
+    0, 115200, 230400, 403200, 460800, 806400, 921600, 1572864, 3145728,
+};
+
+int
+umcs_calc_baudrate(uint32_t rate, uint16_t *divisor, uint8_t *clk)
+{
+	const uint8_t divisors_len = nitems(umcs_baudrate_divisors);
+	uint8_t i = 0;
+
+	if (rate > umcs_baudrate_divisors[divisors_len - 1])
+		return (-1);
+
+	for (i = 0; i < divisors_len - 1; i++) {
+	     if (rate > umcs_baudrate_divisors[i] &&
+		 rate <= umcs_baudrate_divisors[i + 1])
+		     break;
+	}
+
+	*divisor = umcs_baudrate_divisors[i + 1] / rate;
+	/* 0x00 .. 0x70 */
+	*clk = i << UMCS_SPx_CLK_SHIFT;
+
+	return (0);
+}
+
+int
+umcs_detach(struct device *self, int flags)
+{
+	struct umcs_softc *sc = (struct umcs_softc *)self;
+
+	if (sc->sc_ipipe != NULL) {
+		usbd_abort_pipe(sc->sc_ipipe);
+		usbd_close_pipe(sc->sc_ipipe);
+		sc->sc_ipipe = NULL;
+	}
+
+	if (sc->sc_ibuf != NULL) {
+		free(sc->sc_ibuf, M_USBDEV, sc->sc_isize);
+		sc->sc_ibuf = NULL;
+	}
+
+	return (config_detach_children(self, flags));
+}
+
+void
+umcs_get_status(void *self, int portno, uint8_t *lsr, uint8_t *msr)
+{
+	struct umcs_softc *sc = self;
+	uint8_t	hw_lsr = 0;	/* local line status register */
+	uint8_t	hw_msr = 0;	/* local modem status register */
+
+	if (usbd_is_dying(sc->sc_udev))
+		return;
+
+	/* Read LSR & MSR */
+	if (umcs_get_uart_reg(sc, portno, UMCS_REG_LSR, &hw_lsr) ||
+	    umcs_get_uart_reg(sc, portno, UMCS_REG_MSR, &hw_msr))
+	    	return;
+
+	*lsr = hw_lsr;
+	*msr = hw_msr;
+}
+
+void
+umcs_set(void *self, int portno, int reg, int onoff)
+{
+	struct umcs_softc *sc = self;
+
+	if (usbd_is_dying(sc->sc_udev))
+		return;
+
+	switch (reg) {
+	case UCOM_SET_DTR:
+		umcs_dtr(sc, portno, onoff);
+		break;
+	case UCOM_SET_RTS:
+		umcs_rts(sc, portno, onoff);
+		break;
+	case UCOM_SET_BREAK:
+		umcs_break(sc, portno, onoff);
+		break;
+	default:
+		break;
+	}
+}
+
+int
+umcs_param(void *self, int portno, struct termios *t)
+{
+	struct umcs_softc *sc = self;
+	uint8_t lcr = sc->sc_subdevs[portno].lcr;
+	uint8_t mcr = sc->sc_subdevs[portno].mcr;
+	int error = 0;
+
+	if (t->c_cflag & CSTOPB)
+		lcr |= UMCS_LCR_STOPB2;
+	else
+		lcr |= UMCS_LCR_STOPB1;
+
+	lcr &= ~UMCS_LCR_PARITYMASK;
+	if (t->c_cflag & PARENB) {
+		lcr |= UMCS_LCR_PARITYON;
+		if (t->c_cflag & PARODD) {
+			lcr = UMCS_LCR_PARITYODD;
+		} else {
+			lcr = UMCS_LCR_PARITYEVEN;
+		}
+	} else {
+		lcr &= ~UMCS_LCR_PARITYON;
+	}
+
+	lcr &= ~UMCS_LCR_DATALENMASK;
+	switch (t->c_cflag & CSIZE) {
+	case CS5:
+		lcr |= UMCS_LCR_DATALEN5;
+		break;
+	case CS6:
+		lcr |= UMCS_LCR_DATALEN6;
+		break;
+	case CS7:
+		lcr |= UMCS_LCR_DATALEN7;
+		break;
+	case CS8:
+		lcr |= UMCS_LCR_DATALEN8;
+		break;
+	}
+
+	if (t->c_cflag & CRTSCTS)
+		mcr |= UMCS_MCR_CTSRTS;
+	else
+		mcr &= ~UMCS_MCR_CTSRTS;
+
+	if (t->c_cflag & CLOCAL)
+		mcr &= ~UMCS_MCR_DTRDSR;
+	else
+		mcr |= UMCS_MCR_DTRDSR;
+
+	if (umcs_set_uart_reg(sc, portno, UMCS_REG_LCR, lcr))
+		return (EIO);
+	sc->sc_subdevs[portno].lcr = lcr;
+
+	if (umcs_set_uart_reg(sc, portno, UMCS_REG_MCR, mcr))
+		return (EIO);
+	sc->sc_subdevs[portno].mcr = mcr;
+
+	error = umcs_set_baudrate(sc, portno, t->c_ospeed);
+
+	return (error);
+}
+
+void
+umcs_dtr(struct umcs_softc *sc, int portno, int onoff)
+{
+	uint8_t mcr = sc->sc_subdevs[portno].mcr;
+
+	if (onoff)
+		mcr |= UMCS_MCR_DTR;
+	else
+		mcr &= ~UMCS_MCR_DTR;
+
+	if (umcs_set_uart_reg(sc, portno, UMCS_REG_MCR, mcr))
+		return;
+	sc->sc_subdevs[portno].mcr = mcr;
+}
+
+void
+umcs_rts(struct umcs_softc *sc, int portno, int onoff)
+{
+	uint8_t mcr = sc->sc_subdevs[portno].mcr;
+
+	if (onoff)
+		mcr |= UMCS_MCR_RTS;
+	else
+		mcr &= ~UMCS_MCR_RTS;
+
+	if (umcs_set_uart_reg(sc, portno, UMCS_REG_MCR, mcr))
+		return;
+	sc->sc_subdevs[portno].mcr = mcr;
+}
+
+void
+umcs_break(struct umcs_softc *sc, int portno, int onoff)
+{
+	uint8_t lcr = sc->sc_subdevs[portno].lcr;
+
+	if (onoff)
+		lcr |= UMCS_LCR_BREAK;
+	else
+		lcr &= ~UMCS_LCR_BREAK;
+
+	if (umcs_set_uart_reg(sc, portno, UMCS_REG_LCR, lcr))
+		return;
+	sc->sc_subdevs[portno].lcr = lcr;
+}
+
+int
+umcs_open(void *self, int portno)
+{
+	struct umcs_softc *sc = self;
+	int pn = sc->sc_subdevs[portno].pn;
+	int spreg = umcs_reg_sp(pn);
+	int ctrlreg = umcs_reg_ctrl(pn);
+	uint8_t mcr = sc->sc_subdevs[portno].mcr;
+	uint8_t lcr = sc->sc_subdevs[portno].lcr;
+	uint8_t data;
+	int error;
+
+	if (usbd_is_dying(sc->sc_udev))
+		return (EIO);
+
+	/* If it very first open, finish global configuration */
+	if (!sc->sc_init_done) {
+		if (umcs_get_reg(sc, UMCS_CTRL1, &data) ||
+		    umcs_set_reg(sc, UMCS_CTRL1, data | UMCS_CTRL1_DRIVER_DONE))
+			return (EIO);
+		sc->sc_init_done = 1;
+	}
+
+	/* Toggle reset bit on-off */
+	if (umcs_get_reg(sc, spreg, &data) ||
+	    umcs_set_reg(sc, spreg, data | UMCS_SPx_UART_RESET) ||
+	    umcs_set_reg(sc, spreg, data & ~UMCS_SPx_UART_RESET))
+		return (EIO);
+
+	/* Set RS-232 mode */
+	if (umcs_set_uart_reg(sc, portno, UMCS_REG_SCRATCHPAD,
+	    UMCS_SCRATCHPAD_RS232))
+		return (EIO);
+
+	/* Disable RX on time of initialization */
+	if (umcs_get_reg(sc, ctrlreg, &data) ||
+	    umcs_set_reg(sc, ctrlreg, data | UMCS_CTRL_RX_DISABLE))
+		return (EIO);
+
+	/* Disable all interrupts */
+	if (umcs_set_uart_reg(sc, portno, UMCS_REG_IER, 0))
+		return (EIO);
+
+	/* Reset FIFO -- documented */
+	if (umcs_set_uart_reg(sc, portno, UMCS_REG_FCR, 0) ||
+	    umcs_set_uart_reg(sc, portno, UMCS_REG_FCR,
+	    UMCS_FCR_ENABLE | UMCS_FCR_FLUSHRHR |
+	    UMCS_FCR_FLUSHTHR | UMCS_FCR_RTL_1_14))
+		return (EIO);
+
+	/* Set 8 bit, no parity, 1 stop bit -- documented */
+	lcr = UMCS_LCR_DATALEN8 | UMCS_LCR_STOPB1;
+	if (umcs_set_uart_reg(sc, portno, UMCS_REG_LCR, lcr))
+		return (EIO);
+	sc->sc_subdevs[portno].lcr = lcr;
+
+	/*
+	 * Enable DTR/RTS on modem control, enable modem interrupts --
+	 * documented
+	 */
+	mcr = UMCS_MCR_DTR | UMCS_MCR_RTS | UMCS_MCR_IE;
+	if (umcs_set_uart_reg(sc, portno, UMCS_REG_MCR, mcr))
+		return (EIO);
+	sc->sc_subdevs[portno].mcr = mcr;
+
+	/* Clearing Bulkin and Bulkout FIFO */
+	if (umcs_get_reg(sc, spreg, &data))
+		return (EIO);
+	data |= UMCS_SPx_RESET_OUT_FIFO|UMCS_SPx_RESET_IN_FIFO;
+	if (umcs_set_reg(sc, spreg, data))
+		return (EIO);
+	data &= ~(UMCS_SPx_RESET_OUT_FIFO|UMCS_SPx_RESET_IN_FIFO);
+	if (umcs_set_reg(sc, spreg, data))
+		return (EIO);
+
+	/* Set speed 9600 */
+	if ((error = umcs_set_baudrate(sc, portno, 9600)) != 0)
+		return (error);
+
+	/* Finally enable all interrupts -- documented */
+	/*
+	 * Copied from vendor driver, I don't know why we should read LCR
+	 * here
+	 */
+	if (umcs_get_uart_reg(sc, portno, UMCS_REG_LCR,
+	    &sc->sc_subdevs[portno].lcr))
+		return (EIO);
+	if (umcs_set_uart_reg(sc, portno, UMCS_REG_IER,
+	    UMCS_IER_RXSTAT | UMCS_IER_MODEM))
+		return (EIO);
+
+	/* Enable RX */
+	if (umcs_get_reg(sc, ctrlreg, &data) ||
+	    umcs_set_reg(sc, ctrlreg, data & ~UMCS_CTRL_RX_DISABLE))
+		return (EIO);
+
+	return (0);
+}
+
+void
+umcs_close(void *self, int portno)
+{
+	struct umcs_softc *sc = self;
+	int pn = sc->sc_subdevs[portno].pn;
+	int ctrlreg = umcs_reg_ctrl(pn);
+	uint8_t data;
+
+	if (usbd_is_dying(sc->sc_udev))
+		return;
+
+	umcs_set_uart_reg(sc, portno, UMCS_REG_MCR, 0);
+	umcs_set_uart_reg(sc, portno, UMCS_REG_IER, 0);
+
+	/* Disable RX */
+	if (umcs_get_reg(sc, ctrlreg, &data) ||
+	    umcs_set_reg(sc, ctrlreg, data | UMCS_CTRL_RX_DISABLE))
+		return;
+}
+
+void
+umcs_intr(struct usbd_xfer *xfer, void *priv, usbd_status status)
+{
+	struct umcs_softc *sc = priv;
+	uint8_t *buf = sc->sc_ibuf;
+	int actlen, i;
+
+	if (usbd_is_dying(sc->sc_udev))
+		return;
+
+	if (status == USBD_CANCELLED || status == USBD_IOERROR)
+		return;
+
+	if (status != USBD_NORMAL_COMPLETION) {
+		DPRINTF("%s: interrupt status=%d\n", DEVNAME(sc), status);
+		usbd_clear_endpoint_stall_async(sc->sc_ipipe);
+		return;
+	}
+
+	usbd_get_xfer_status(xfer, NULL, NULL, &actlen, NULL);
+	if (actlen != 5 && actlen != 13) {
+		printf("%s: invalid interrupt data length %d\n", DEVNAME(sc),
+		    actlen);
+		return;
+	}
+
+	/* Check status of all ports */
+	for (i = 0; i < sc->sc_numports; i++) {
+		uint8_t pn = sc->sc_subdevs[i].pn;
+
+		if (buf[pn] & UMCS_ISR_NOPENDING)
+			continue;
+
+		DPRINTF("%s: port %d has pending interrupt: %02x, FIFO=%02x\n",
+		    DEVNAME(sc), i, buf[pn] & UMCS_ISR_INTMASK,
+		    buf[pn] & (~UMCS_ISR_INTMASK));
+
+		switch (buf[pn] & UMCS_ISR_INTMASK) {
+		case UMCS_ISR_RXERR:
+		case UMCS_ISR_RXHASDATA:
+		case UMCS_ISR_RXTIMEOUT:
+		case UMCS_ISR_MSCHANGE:
+			ucom_status_change(sc->sc_subdevs[i].ucom);
+			break;
+		default:
+			/* Do nothing */
+			break;
+		}
+	}
+}