* Copyright (c) 2007 The NetBSD Foundation, Inc.

/* $NetBSD: uchcom.c,v 1.40 2021/08/07 16:19:17 thorpej Exp $ */

/*
* Copyright (c) 2007 The NetBSD Foundation, Inc.
* All rights reserved.
*
* This code is derived from software contributed to The NetBSD Foundation
* by Takuya SHIOZAKI ([email protected]).
*
* 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.
*/

#include <sys/cdefs.h>
__KERNEL_RCSID(0, "$NetBSD: uchcom.c,v 1.40 2021/08/07 16:19:17 thorpej Exp $");

#ifdef _KERNEL_OPT
#include "opt_usb.h"
#endif

/*
* driver for WinChipHead CH341/340, the worst USB-serial chip in the world.
*/

#include <sys/param.h>
#include <sys/systm.h>
#include <sys/kernel.h>
#include <sys/kmem.h>
#include <sys/ioctl.h>
#include <sys/conf.h>
#include <sys/tty.h>
#include <sys/file.h>
#include <sys/select.h>
#include <sys/proc.h>
#include <sys/device.h>
#include <sys/poll.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>

#ifdef UCHCOM_DEBUG
#define DPRINTFN(n, x) if (uchcomdebug > (n)) printf x
int uchcomdebug = 0;
#else
#define DPRINTFN(n, x)
#endif
#define DPRINTF(x) DPRINTFN(0, x)

#define UCHCOM_IFACE_INDEX 0
#define UCHCOM_CONFIG_INDEX 0

#define UCHCOM_INPUT_BUF_SIZE 8

#define UCHCOM_REQ_GET_VERSION 0x5F
#define UCHCOM_REQ_READ_REG 0x95
#define UCHCOM_REQ_WRITE_REG 0x9A
#define UCHCOM_REQ_RESET 0xA1
#define UCHCOM_REQ_SET_DTRRTS 0xA4

#define UCHCOM_REG_STAT1 0x06
#define UCHCOM_REG_STAT2 0x07
#define UCHCOM_REG_BPS_PRE 0x12
#define UCHCOM_REG_BPS_DIV 0x13
#define UCHCOM_REG_BREAK 0x05
#define UCHCOM_REG_LCR 0x18
#define UCHCOM_REG_LCR2 0x25

#define UCHCOM_VER_20 0x20
#define UCHCOM_VER_30 0x30

#define UCHCOM_BPS_PRE_IMM 0x80 /* CH341: immediate RX forwarding */

#define UCHCOM_DTR_MASK 0x20
#define UCHCOM_RTS_MASK 0x40

#define UCHCOM_BREAK_MASK 0x01

#define UCHCOM_LCR_CS5 0x00
#define UCHCOM_LCR_CS6 0x01
#define UCHCOM_LCR_CS7 0x02
#define UCHCOM_LCR_CS8 0x03
#define UCHCOM_LCR_STOPB 0x04
#define UCHCOM_LCR_PARENB 0x08
#define UCHCOM_LCR_PARODD 0x00
#define UCHCOM_LCR_PAREVEN 0x10
#define UCHCOM_LCR_PARMARK 0x20
#define UCHCOM_LCR_PARSPACE 0x30
#define UCHCOM_LCR_TXE 0x40
#define UCHCOM_LCR_RXE 0x80

#define UCHCOM_INTR_STAT1 0x02
#define UCHCOM_INTR_STAT2 0x03
#define UCHCOM_INTR_LEAST 4

#define UCHCOMIBUFSIZE 256
#define UCHCOMOBUFSIZE 256

struct uchcom_softc
{
device_t sc_dev;
struct usbd_device * sc_udev;
device_t sc_subdev;
struct usbd_interface * sc_iface;
bool sc_dying;
/* */
int sc_intr_endpoint;
int sc_intr_size;
struct usbd_pipe * sc_intr_pipe;
u_char *sc_intr_buf;
/* */
uint8_t sc_version;
int sc_dtr;
int sc_rts;
u_char sc_lsr;
u_char sc_msr;
};

struct uchcom_endpoints
{
int ep_bulkin;
int ep_bulkout;
int ep_intr;
int ep_intr_size;
};

struct uchcom_divider
{
uint8_t dv_prescaler;
uint8_t dv_div;
};

/* 0,1,2,3,7 are prescale factors for given 4x 12000000 clock formula */
static const uint32_t rates4x[8] = {
[0] = 4 * 12000000 / 1024,
[1] = 4 * 12000000 / 128,
[2] = 4 * 12000000 / 16,
[3] = 4 * 12000000 / 2,
[7] = 4 * 12000000,
};

static const struct usb_devno uchcom_devs[] = {
{ USB_VENDOR_QINHENG2, USB_PRODUCT_QINHENG2_CH341SER },
{ USB_VENDOR_QINHENG, USB_PRODUCT_QINHENG_CH340 },
{ USB_VENDOR_QINHENG, USB_PRODUCT_QINHENG_CH341_ASP },
};
#define uchcom_lookup(v, p) usb_lookup(uchcom_devs, v, p)

static void uchcom_get_status(void *, int, u_char *, u_char *);
static void uchcom_set(void *, int, int, int);
static int uchcom_param(void *, int, struct termios *);
static int uchcom_open(void *, int);
static void uchcom_close(void *, int);
static void uchcom_intr(struct usbd_xfer *, void *,
usbd_status);

static int set_config(struct uchcom_softc *);
static int find_ifaces(struct uchcom_softc *, struct usbd_interface **);
static int find_endpoints(struct uchcom_softc *,
struct uchcom_endpoints *);
static void close_intr_pipe(struct uchcom_softc *);

static const struct ucom_methods uchcom_methods = {
.ucom_get_status = uchcom_get_status,
.ucom_set = uchcom_set,
.ucom_param = uchcom_param,
.ucom_open = uchcom_open,
.ucom_close = uchcom_close,
};

static int uchcom_match(device_t, cfdata_t, void *);
static void uchcom_attach(device_t, device_t, void *);
static void uchcom_childdet(device_t, device_t);
static int uchcom_detach(device_t, int);

CFATTACH_DECL2_NEW(uchcom,
sizeof(struct uchcom_softc),
uchcom_match,
uchcom_attach,
uchcom_detach,
NULL,
NULL,
uchcom_childdet);

/* ----------------------------------------------------------------------
* driver entry points
*/

static int
uchcom_match(device_t parent, cfdata_t match, void *aux)
{
struct usb_attach_arg *uaa = aux;

return (uchcom_lookup(uaa->uaa_vendor, uaa->uaa_product) != NULL ?
UMATCH_VENDOR_PRODUCT : UMATCH_NONE);
}

static void
uchcom_attach(device_t parent, device_t self, void *aux)
{
struct uchcom_softc *sc = device_private(self);
struct usb_attach_arg *uaa = aux;
struct usbd_device *dev = uaa->uaa_device;
char *devinfop;
struct uchcom_endpoints endpoints;
struct ucom_attach_args ucaa;

aprint_naive("\n");
aprint_normal("\n");

devinfop = usbd_devinfo_alloc(dev, 0);
aprint_normal_dev(self, "%s\n", devinfop);
usbd_devinfo_free(devinfop);

sc->sc_dev = self;
sc->sc_udev = dev;
sc->sc_dying = false;
sc->sc_dtr = sc->sc_rts = -1;
sc->sc_lsr = sc->sc_msr = 0;

DPRINTF(("\n\nuchcom attach: sc=%p\n", sc));

if (set_config(sc))
goto failed;

if (find_ifaces(sc, &sc->sc_iface))
goto failed;

if (find_endpoints(sc, &endpoints))
goto failed;

sc->sc_intr_endpoint = endpoints.ep_intr;
sc->sc_intr_size = endpoints.ep_intr_size;

/* setup ucom layer */
ucaa.ucaa_portno = UCOM_UNK_PORTNO;
ucaa.ucaa_bulkin = endpoints.ep_bulkin;
ucaa.ucaa_bulkout = endpoints.ep_bulkout;
ucaa.ucaa_ibufsize = UCHCOMIBUFSIZE;
ucaa.ucaa_obufsize = UCHCOMOBUFSIZE;
ucaa.ucaa_ibufsizepad = UCHCOMIBUFSIZE;
ucaa.ucaa_opkthdrlen = 0;
ucaa.ucaa_device = dev;
ucaa.ucaa_iface = sc->sc_iface;
ucaa.ucaa_methods = &uchcom_methods;
ucaa.ucaa_arg = sc;
ucaa.ucaa_info = NULL;

usbd_add_drv_event(USB_EVENT_DRIVER_ATTACH, sc->sc_udev, sc->sc_dev);

sc->sc_subdev = config_found(self, &ucaa, ucomprint,
CFARGS(.submatch = ucomsubmatch));

return;

failed:
sc->sc_dying = true;
return;
}

static void
uchcom_childdet(device_t self, device_t child)
{
struct uchcom_softc *sc = device_private(self);

KASSERT(sc->sc_subdev == child);
sc->sc_subdev = NULL;
}

static int
uchcom_detach(device_t self, int flags)
{
struct uchcom_softc *sc = device_private(self);
int rv = 0;

DPRINTF(("uchcom_detach: sc=%p flags=%d\n", sc, flags));

close_intr_pipe(sc);

sc->sc_dying = true;

if (sc->sc_subdev != NULL) {
rv = config_detach(sc->sc_subdev, flags);
sc->sc_subdev = NULL;
}

usbd_add_drv_event(USB_EVENT_DRIVER_DETACH, sc->sc_udev, sc->sc_dev);

return rv;
}

static int
set_config(struct uchcom_softc *sc)
{
usbd_status err;

err = usbd_set_config_index(sc->sc_udev, UCHCOM_CONFIG_INDEX, 1);
if (err) {
aprint_error_dev(sc->sc_dev,
"failed to set configuration: %s\n", usbd_errstr(err));
return -1;
}

return 0;
}

static int
find_ifaces(struct uchcom_softc *sc, struct usbd_interface **riface)
{
usbd_status err;

err = usbd_device2interface_handle(sc->sc_udev, UCHCOM_IFACE_INDEX,
riface);
if (err) {
aprint_error("\n%s: failed to get interface: %s\n",
device_xname(sc->sc_dev), usbd_errstr(err));
return -1;
}

return 0;
}

static int
find_endpoints(struct uchcom_softc *sc, struct uchcom_endpoints *endpoints)
{
int i, bin=-1, bout=-1, intr=-1, isize=0;
usb_interface_descriptor_t *id;
usb_endpoint_descriptor_t *ed;

id = usbd_get_interface_descriptor(sc->sc_iface);

for (i = 0; i < id->bNumEndpoints; i++) {
ed = usbd_interface2endpoint_descriptor(sc->sc_iface, i);
if (ed == NULL) {
aprint_error_dev(sc->sc_dev,
"no endpoint descriptor for %d\n", i);
return -1;
}

if (UE_GET_DIR(ed->bEndpointAddress) == UE_DIR_IN &&
UE_GET_XFERTYPE(ed->bmAttributes) == UE_INTERRUPT) {
intr = ed->bEndpointAddress;
isize = UGETW(ed->wMaxPacketSize);
} else if (UE_GET_DIR(ed->bEndpointAddress) == UE_DIR_IN &&
UE_GET_XFERTYPE(ed->bmAttributes) == UE_BULK) {
bin = ed->bEndpointAddress;
} else if (UE_GET_DIR(ed->bEndpointAddress) == UE_DIR_OUT &&
UE_GET_XFERTYPE(ed->bmAttributes) == UE_BULK) {
bout = ed->bEndpointAddress;
}
}

if (intr == -1 || bin == -1 || bout == -1) {
if (intr == -1) {
aprint_error_dev(sc->sc_dev,
"no interrupt end point\n");
}
if (bin == -1) {
aprint_error_dev(sc->sc_dev,
"no data bulk in end point\n");
}
if (bout == -1) {
aprint_error_dev(sc->sc_dev,
"no data bulk out end point\n");
}
return -1;
}
if (isize < UCHCOM_INTR_LEAST) {
aprint_error_dev(sc->sc_dev, "intr pipe is too short\n");
return -1;
}

DPRINTF(("%s: bulkin=%d, bulkout=%d, intr=%d, isize=%d\n",
device_xname(sc->sc_dev), bin, bout, intr, isize));

endpoints->ep_intr = intr;
endpoints->ep_intr_size = isize;
endpoints->ep_bulkin = bin;
endpoints->ep_bulkout = bout;

return 0;
}

/* ----------------------------------------------------------------------
* low level i/o
*/

static __inline usbd_status
generic_control_out(struct uchcom_softc *sc, uint8_t reqno,
uint16_t value, uint16_t index)
{
usb_device_request_t req;

req.bmRequestType = UT_WRITE_VENDOR_DEVICE;
req.bRequest = reqno;
USETW(req.wValue, value);
USETW(req.wIndex, index);
USETW(req.wLength, 0);

return usbd_do_request(sc->sc_udev, &req, 0);
}

static __inline usbd_status
generic_control_in(struct uchcom_softc *sc, uint8_t reqno,
uint16_t value, uint16_t index, void *buf, int buflen,
int *actlen)
{
usb_device_request_t req;

req.bmRequestType = UT_READ_VENDOR_DEVICE;
req.bRequest = reqno;
USETW(req.wValue, value);
USETW(req.wIndex, index);
USETW(req.wLength, (uint16_t)buflen);

return usbd_do_request_flags(sc->sc_udev, &req, buf,
USBD_SHORT_XFER_OK, actlen,
USBD_DEFAULT_TIMEOUT);
}

static __inline usbd_status
write_reg(struct uchcom_softc *sc,
uint8_t reg1, uint8_t val1, uint8_t reg2, uint8_t val2)
{
DPRINTF(("%s: write reg 0x%02X<-0x%02X, 0x%02X<-0x%02X\n",
device_xname(sc->sc_dev),
(unsigned)reg1, (unsigned)val1,
(unsigned)reg2, (unsigned)val2));
return generic_control_out(
sc, UCHCOM_REQ_WRITE_REG,
reg1|((uint16_t)reg2<<8), val1|((uint16_t)val2<<8));
}

static __inline usbd_status
read_reg(struct uchcom_softc *sc,
uint8_t reg1, uint8_t *rval1, uint8_t reg2, uint8_t *rval2)
{
uint8_t buf[UCHCOM_INPUT_BUF_SIZE];
usbd_status err;
int actin;

err = generic_control_in(
sc, UCHCOM_REQ_READ_REG,
reg1|((uint16_t)reg2<<8), 0, buf, sizeof(buf), &actin);
if (err)
return err;

DPRINTF(("%s: read reg 0x%02X->0x%02X, 0x%02X->0x%02X\n",
device_xname(sc->sc_dev),
(unsigned)reg1, (unsigned)buf[0],
(unsigned)reg2, (unsigned)buf[1]));

if (rval1) *rval1 = buf[0];
if (rval2) *rval2 = buf[1];

return USBD_NORMAL_COMPLETION;
}

static __inline usbd_status
get_version(struct uchcom_softc *sc, uint8_t *rver)
{
uint8_t buf[UCHCOM_INPUT_BUF_SIZE];
usbd_status err;
int actin;

err = generic_control_in(
sc, UCHCOM_REQ_GET_VERSION, 0, 0, buf, sizeof(buf), &actin);
if (err)
return err;

if (rver) *rver = buf[0];

return USBD_NORMAL_COMPLETION;
}

static __inline usbd_status
get_status(struct uchcom_softc *sc, uint8_t *rval)
{
return read_reg(sc, UCHCOM_REG_STAT1, rval, UCHCOM_REG_STAT2, NULL);
}

static __inline usbd_status
set_dtrrts_10(struct uchcom_softc *sc, uint8_t val)
{
return write_reg(sc, UCHCOM_REG_STAT1, val, UCHCOM_REG_STAT1, val);
}

static __inline usbd_status
set_dtrrts_20(struct uchcom_softc *sc, uint8_t val)
{
return generic_control_out(sc, UCHCOM_REQ_SET_DTRRTS, val, 0);
}

/* ----------------------------------------------------------------------
* middle layer
*/

static int
update_version(struct uchcom_softc *sc)
{
usbd_status err;

err = get_version(sc, &sc->sc_version);
if (err) {
device_printf(sc->sc_dev, "cannot get version: %s\n",
usbd_errstr(err));
return EIO;
}
DPRINTF(("%s: update_version %d\n", device_xname(sc->sc_dev), sc->sc_version));

return 0;
}

static void
convert_status(struct uchcom_softc *sc, uint8_t cur)
{
sc->sc_dtr = !(cur & UCHCOM_DTR_MASK);
sc->sc_rts = !(cur & UCHCOM_RTS_MASK);

cur = ~cur & 0x0F;
sc->sc_msr = (cur << 4) | ((sc->sc_msr >> 4) ^ cur);
}

static int
update_status(struct uchcom_softc *sc)
{
usbd_status err;
uint8_t cur;

err = get_status(sc, &cur);
if (err) {
device_printf(sc->sc_dev,
"cannot update status: %s\n", usbd_errstr(err));
return EIO;
}
convert_status(sc, cur);

return 0;
}

static int
set_dtrrts(struct uchcom_softc *sc, int dtr, int rts)
{
usbd_status err;
uint8_t val = 0;

if (dtr) val |= UCHCOM_DTR_MASK;
if (rts) val |= UCHCOM_RTS_MASK;

if (sc->sc_version < UCHCOM_VER_20)
err = set_dtrrts_10(sc, ~val);
else
err = set_dtrrts_20(sc, ~val);

if (err) {
device_printf(sc->sc_dev, "cannot set DTR/RTS: %s\n",
usbd_errstr(err));
return EIO;
}

return 0;
}

static int
set_break(struct uchcom_softc *sc, int onoff)
{
usbd_status err;
uint8_t brk, lcr;

err = read_reg(sc, UCHCOM_REG_BREAK, &brk, UCHCOM_REG_LCR, &lcr);
if (err)
return EIO;
if (onoff) {
/* on - clear bits */
brk &= ~UCHCOM_BREAK_MASK;
lcr &= ~UCHCOM_LCR_TXE;
} else {
/* off - set bits */
brk |= UCHCOM_BREAK_MASK;
lcr |= UCHCOM_LCR_TXE;
}
err = write_reg(sc, UCHCOM_REG_BREAK, brk, UCHCOM_REG_LCR, lcr);
if (err)
return EIO;

return 0;
}

static int
calc_divider_settings(struct uchcom_divider *dp, uint32_t rate)
{
/*
* combined with rates4x[] defined above, this routine generates,
* 1200: prescale = 1/0x1, divisor = 178/0xb2
* 2400: prescale = 1/0x1, divisor = 217/0xd9
* 4800: prescale = 2/0x2, divisor = 100/0x64
* 9600: prescale = 2/0x2, divisor = 178/0xb2
* 19200: prescale = 2/0x2, divisor = 217/0xd9
* 38400: prescale = 3/0x3, divisor = 100/0x64
* 57600: prescale = 2/0x2, divisor = 243/0xf3
* 115200: prescale = 3/0x3, divisor = 204/0xcc
* 921600: prescale = 7/0x7, divisor = 243/0xf3
* 500000: prescale = 3/0x3, divisor = 244/0xf4
* 1000000: prescale = 3/0x3, divisor = 250/0xfa
* 1500000: prescale = 3/0x3, divisor = 252/0xfc
* 2000000: prescale = 3/0x3, divisor = 253/0xfd
* 2500000: unsupported
* 3000000: prescale = 3/0x3, divisor = 254/0xfe
*/
size_t i;
uint32_t best, div, pre;
const uint32_t rate4x = rate * 4U;

if (rate == 0 || rate > 3000000)
return -1;

pre = __arraycount(rates4x);
best = UINT32_MAX;

for (i = 0; i < __arraycount(rates4x); i++) {
uint32_t score, try;
try = rates4x[i] * 2 / rate4x;
try = (try / 2) + (try & 1);
if (try < 2)
continue;
if (try > 255)
try = 255;
score = abs((int)rate4x - rates4x[i] / try);
if (score < best) {
best = score;
pre = i;
div = try;
}
}

if (pre >= __arraycount(rates4x))
return -1;
if ((rates4x[pre] / div / 4) < (rate * 99 / 100))
return -1;
if ((rates4x[pre] / div / 4) > (rate * 101 / 100))
return -1;

dp->dv_prescaler = pre;
dp->dv_div = 256 - div;

return 0;
}

static int
set_dte_rate(struct uchcom_softc *sc, uint32_t rate)
{
usbd_status err;
struct uchcom_divider dv;

if (calc_divider_settings(&dv, rate))
return EINVAL;

if ((err = write_reg(sc,
UCHCOM_REG_BPS_PRE,
dv.dv_prescaler | UCHCOM_BPS_PRE_IMM,
UCHCOM_REG_BPS_DIV, dv.dv_div))) {
device_printf(sc->sc_dev, "cannot set DTE rate: %s\n",
usbd_errstr(err));
return EIO;
}

return 0;
}

static int
set_line_control(struct uchcom_softc *sc, tcflag_t cflag)
{
usbd_status err;
uint8_t lcr = 0, lcr2 = 0;

err = read_reg(sc, UCHCOM_REG_LCR, &lcr, UCHCOM_REG_LCR2, &lcr2);
if (err) {
device_printf(sc->sc_dev, "cannot get LCR: %s\n",
usbd_errstr(err));
return EIO;
}

lcr = UCHCOM_LCR_RXE | UCHCOM_LCR_TXE;

switch (ISSET(cflag, CSIZE)) {
case CS5:
lcr |= UCHCOM_LCR_CS5;
break;
case CS6:
lcr |= UCHCOM_LCR_CS6;
break;
case CS7:
lcr |= UCHCOM_LCR_CS7;
break;
case CS8:
lcr |= UCHCOM_LCR_CS8;
break;
}

if (ISSET(cflag, PARENB)) {
lcr |= UCHCOM_LCR_PARENB;
if (!ISSET(cflag, PARODD))
lcr |= UCHCOM_LCR_PAREVEN;
}

if (ISSET(cflag, CSTOPB)) {
lcr |= UCHCOM_LCR_STOPB;
}

err = write_reg(sc, UCHCOM_REG_LCR, lcr, UCHCOM_REG_LCR2, lcr2);
if (err) {
device_printf(sc->sc_dev, "cannot set LCR: %s\n",
usbd_errstr(err));
return EIO;
}

return 0;
}

static int
clear_chip(struct uchcom_softc *sc)
{
usbd_status err;

DPRINTF(("%s: clear\n", device_xname(sc->sc_dev)));
err = generic_control_out(sc, UCHCOM_REQ_RESET, 0, 0);
if (err) {
device_printf(sc->sc_dev, "cannot clear: %s\n",
usbd_errstr(err));
return EIO;
}
/*
* this REQ_RESET call ends up with
* LCR=0xc0 (8N1)
* PRE=0x02, DIV=0xd9 (19200)
*/
return 0;
}

static int
setup_comm(struct uchcom_softc *sc)
{
int ret;

ret = update_version(sc);
if (ret)
return ret;

ret = clear_chip(sc);
if (ret)
return ret;

ret = set_dte_rate(sc, TTYDEF_SPEED);
if (ret)
return ret;

ret = set_line_control(sc, CS8);
if (ret)
return ret;

ret = update_status(sc);
if (ret)
return ret;

sc->sc_dtr = sc->sc_rts = 1;
ret = set_dtrrts(sc, sc->sc_dtr, sc->sc_rts);
if (ret)
return ret;

return 0;
}

static int
setup_intr_pipe(struct uchcom_softc *sc)
{
usbd_status err;

if (sc->sc_intr_endpoint != -1 && sc->sc_intr_pipe == NULL) {
sc->sc_intr_buf = kmem_alloc(sc->sc_intr_size, KM_SLEEP);
err = usbd_open_pipe_intr(sc->sc_iface,
sc->sc_intr_endpoint,
USBD_SHORT_XFER_OK,
&sc->sc_intr_pipe, sc,
sc->sc_intr_buf,
sc->sc_intr_size,
uchcom_intr, USBD_DEFAULT_INTERVAL);
if (err) {
device_printf(sc->sc_dev,
"cannot open interrupt pipe: %s\n",
usbd_errstr(err));
return EIO;
}
}
return 0;
}

static void
close_intr_pipe(struct uchcom_softc *sc)
{

if (sc->sc_intr_pipe != NULL) {
usbd_abort_pipe(sc->sc_intr_pipe);
usbd_close_pipe(sc->sc_intr_pipe);
sc->sc_intr_pipe = NULL;
}
if (sc->sc_intr_buf != NULL) {
kmem_free(sc->sc_intr_buf, sc->sc_intr_size);
sc->sc_intr_buf = NULL;
}
}

/* ----------------------------------------------------------------------
* methods for ucom
*/
static void
uchcom_get_status(void *arg, int portno, u_char *rlsr, u_char *rmsr)
{
struct uchcom_softc *sc = arg;

if (sc->sc_dying)
return;

*rlsr = sc->sc_lsr;
*rmsr = sc->sc_msr;
}

static void
uchcom_set(void *arg, int portno, int reg, int onoff)
{
struct uchcom_softc *sc = arg;

if (sc->sc_dying)
return;

switch (reg) {
case UCOM_SET_DTR:
sc->sc_dtr = !!onoff;
set_dtrrts(sc, sc->sc_dtr, sc->sc_rts);
break;
case UCOM_SET_RTS:
sc->sc_rts = !!onoff;
set_dtrrts(sc, sc->sc_dtr, sc->sc_rts);
break;
case UCOM_SET_BREAK:
set_break(sc, onoff);
break;
}
}

static int
uchcom_param(void *arg, int portno, struct termios *t)
{
struct uchcom_softc *sc = arg;
int ret;

if (sc->sc_dying)
return EIO;

ret = set_line_control(sc, t->c_cflag);
if (ret)
return ret;

ret = set_dte_rate(sc, t->c_ospeed);
if (ret)
return ret;

return 0;
}

static int
uchcom_open(void *arg, int portno)
{
int ret;
struct uchcom_softc *sc = arg;

if (sc->sc_dying)
return EIO;

ret = setup_intr_pipe(sc);
if (ret)
return ret;

ret = setup_comm(sc);
if (ret)
return ret;

return 0;
}

static void
uchcom_close(void *arg, int portno)
{
struct uchcom_softc *sc = arg;

if (sc->sc_dying)
return;

close_intr_pipe(sc);
}

/* ----------------------------------------------------------------------
* callback when the modem status is changed.
*/
static void
uchcom_intr(struct usbd_xfer *xfer, void * priv,
usbd_status status)
{
struct uchcom_softc *sc = priv;
u_char *buf = sc->sc_intr_buf;

if (sc->sc_dying)
return;

if (status != USBD_NORMAL_COMPLETION) {
if (status == USBD_NOT_STARTED || status == USBD_CANCELLED)
return;

DPRINTF(("%s: abnormal status: %s\n",
device_xname(sc->sc_dev), usbd_errstr(status)));
usbd_clear_endpoint_stall_async(sc->sc_intr_pipe);
return;
}
DPRINTF(("%s: intr: 0x%02X 0x%02X 0x%02X 0x%02X "
"0x%02X 0x%02X 0x%02X 0x%02X\n",
device_xname(sc->sc_dev),
(unsigned)buf[0], (unsigned)buf[1],
(unsigned)buf[2], (unsigned)buf[3],
(unsigned)buf[4], (unsigned)buf[5],
(unsigned)buf[6], (unsigned)buf[7]));

convert_status(sc, buf[UCHCOM_INTR_STAT1]);
ucom_status_change(device_private(sc->sc_subdev));
}