sys/dev/usb/serial/umct.c

   1 #include <sys/cdefs.h>
   2 __FBSDID("$FreeBSD$");
   3
   4 /*-
   5  * Copyright (c) 2003 Scott Long
   6  * All rights reserved.
   7  *
   8  * Redistribution and use in source and binary forms, with or without
   9  * modification, are permitted provided that the following conditions
  10  * are met:
  11  * 1. Redistributions of source code must retain the above copyright
  12  *    notice, this list of conditions and the following disclaimer.
  13  * 2. Redistributions in binary form must reproduce the above copyright
  14  *    notice, this list of conditions and the following disclaimer in the
  15  *    documentation and/or other materials provided with the distribution.
  16  *
  17  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
  18  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  19  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  20  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
  21  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  22  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  23  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  24  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  25  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  26  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  27  * SUCH DAMAGE.
  28  *
  29  */
  30
  31 /*
  32  * Driver for the MCT (Magic Control Technology) USB-RS232 Converter.
  33  * Based on the superb documentation from the linux mct_u232 driver by
  34  * Wolfgang Grandeggar <wolfgang@cec.ch>.
  35  * This device smells a lot like the Belkin F5U103, except that it has
  36  * suffered some mild brain-damage.  This driver is based off of the ubsa.c
  37  * driver from Alexander Kabaev <kan@FreeBSD.org>.  Merging the two together
  38  * might be useful, though the subtle differences might lead to lots of
  39  * #ifdef's.
  40  */
  41
  42 /*
  43  * NOTE: all function names beginning like "umct_cfg_" can only
  44  * be called from within the config thread function !
  45  */
  46
  47 #include <sys/stdint.h>
  48 #include <sys/stddef.h>
  49 #include <sys/param.h>
  50 #include <sys/queue.h>
  51 #include <sys/types.h>
  52 #include <sys/systm.h>
  53 #include <sys/kernel.h>
  54 #include <sys/bus.h>
  55 #include <sys/linker_set.h>
  56 #include <sys/module.h>
  57 #include <sys/lock.h>
  58 #include <sys/mutex.h>
  59 #include <sys/condvar.h>
  60 #include <sys/sysctl.h>
  61 #include <sys/sx.h>
  62 #include <sys/unistd.h>
  63 #include <sys/callout.h>
  64 #include <sys/malloc.h>
  65 #include <sys/priv.h>
  66
  67 #include <dev/usb/usb.h>
  68 #include <dev/usb/usbdi.h>
  69 #include <dev/usb/usbdi_util.h>
  70 #include "usbdevs.h"
  71
  72 #define USB_DEBUG_VAR usb_debug
  73 #include <dev/usb/usb_debug.h>
  74 #include <dev/usb/usb_process.h>
  75
  76 #include <dev/usb/serial/usb_serial.h>
  77
  78 /* The UMCT advertises the standard 8250 UART registers */
  79 #define UMCT_GET_MSR            2       /* Get Modem Status Register */
  80 #define UMCT_GET_MSR_SIZE       1
  81 #define UMCT_GET_LCR            6       /* Get Line Control Register */
  82 #define UMCT_GET_LCR_SIZE       1
  83 #define UMCT_SET_BAUD           5       /* Set the Baud Rate Divisor */
  84 #define UMCT_SET_BAUD_SIZE      4
  85 #define UMCT_SET_LCR            7       /* Set Line Control Register */
  86 #define UMCT_SET_LCR_SIZE       1
  87 #define UMCT_SET_MCR            10      /* Set Modem Control Register */
  88 #define UMCT_SET_MCR_SIZE       1
  89
  90 #define UMCT_INTR_INTERVAL      100
  91 #define UMCT_IFACE_INDEX        0
  92 #define UMCT_CONFIG_INDEX       0
  93
  94 enum {
  95         UMCT_BULK_DT_WR,
  96         UMCT_BULK_DT_RD,
  97         UMCT_INTR_DT_RD,
  98         UMCT_N_TRANSFER,
  99 };
 100
 101 struct umct_softc {
 102         struct ucom_super_softc sc_super_ucom;
 103         struct ucom_softc sc_ucom;
 104
 105         struct usb_device *sc_udev;
 106         struct usb_xfer *sc_xfer[UMCT_N_TRANSFER];
 107         struct mtx sc_mtx;
 108
 109         uint32_t sc_unit;
 110
 111         uint16_t sc_obufsize;
 112
 113         uint8_t sc_lsr;
 114         uint8_t sc_msr;
 115         uint8_t sc_lcr;
 116         uint8_t sc_mcr;
 117         uint8_t sc_iface_no;
 118         uint8_t sc_swap_cb;
 119         uint8_t sc_name[16];
 120 };
 121
 122 /* prototypes */
 123
 124 static device_probe_t umct_probe;
 125 static device_attach_t umct_attach;
 126 static device_detach_t umct_detach;
 127
 128 static usb_callback_t umct_intr_callback;
 129 static usb_callback_t umct_intr_callback_sub;
 130 static usb_callback_t umct_read_callback;
 131 static usb_callback_t umct_read_callback_sub;
 132 static usb_callback_t umct_write_callback;
 133
 134 static void     umct_cfg_do_request(struct umct_softc *sc, uint8_t request,
 135                     uint16_t len, uint32_t value);
 136 static void     umct_cfg_get_status(struct ucom_softc *, uint8_t *,
 137                     uint8_t *);
 138 static void     umct_cfg_set_break(struct ucom_softc *, uint8_t);
 139 static void     umct_cfg_set_dtr(struct ucom_softc *, uint8_t);
 140 static void     umct_cfg_set_rts(struct ucom_softc *, uint8_t);
 141 static uint8_t  umct_calc_baud(uint32_t);
 142 static int      umct_pre_param(struct ucom_softc *, struct termios *);
 143 static void     umct_cfg_param(struct ucom_softc *, struct termios *);
 144 static void     umct_start_read(struct ucom_softc *);
 145 static void     umct_stop_read(struct ucom_softc *);
 146 static void     umct_start_write(struct ucom_softc *);
 147 static void     umct_stop_write(struct ucom_softc *);
 148 static void     umct_poll(struct ucom_softc *ucom);
 149
 150 static const struct usb_config umct_config[UMCT_N_TRANSFER] = {
 151
 152         [UMCT_BULK_DT_WR] = {
 153                 .type = UE_BULK,
 154                 .endpoint = UE_ADDR_ANY,
 155                 .direction = UE_DIR_OUT,
 156                 .bufsize = 0,   /* use wMaxPacketSize */
 157                 .flags = {.pipe_bof = 1,.force_short_xfer = 1,},
 158                 .callback = &umct_write_callback,
 159         },
 160
 161         [UMCT_BULK_DT_RD] = {
 162                 .type = UE_INTERRUPT,
 163                 .endpoint = UE_ADDR_ANY,
 164                 .direction = UE_DIR_IN,
 165                 .flags = {.pipe_bof = 1,.short_xfer_ok = 1,},
 166                 .bufsize = 0,   /* use wMaxPacketSize */
 167                 .callback = &umct_read_callback,
 168                 .ep_index = 0,          /* first interrupt endpoint */
 169         },
 170
 171         [UMCT_INTR_DT_RD] = {
 172                 .type = UE_INTERRUPT,
 173                 .endpoint = UE_ADDR_ANY,
 174                 .direction = UE_DIR_IN,
 175                 .flags = {.pipe_bof = 1,.short_xfer_ok = 1,},
 176                 .bufsize = 0,   /* use wMaxPacketSize */
 177                 .callback = &umct_intr_callback,
 178                 .ep_index = 1,          /* second interrupt endpoint */
 179         },
 180 };
 181
 182 static const struct ucom_callback umct_callback = {
 183         .ucom_cfg_get_status = &umct_cfg_get_status,
 184         .ucom_cfg_set_dtr = &umct_cfg_set_dtr,
 185         .ucom_cfg_set_rts = &umct_cfg_set_rts,
 186         .ucom_cfg_set_break = &umct_cfg_set_break,
 187         .ucom_cfg_param = &umct_cfg_param,
 188         .ucom_pre_param = &umct_pre_param,
 189         .ucom_start_read = &umct_start_read,
 190         .ucom_stop_read = &umct_stop_read,
 191         .ucom_start_write = &umct_start_write,
 192         .ucom_stop_write = &umct_stop_write,
 193         .ucom_poll = &umct_poll,
 194 };
 195
 196 static const struct usb_device_id umct_devs[] = {
 197         {USB_VPI(USB_VENDOR_MCT, USB_PRODUCT_MCT_USB232, 0)},
 198         {USB_VPI(USB_VENDOR_MCT, USB_PRODUCT_MCT_SITECOM_USB232, 0)},
 199         {USB_VPI(USB_VENDOR_MCT, USB_PRODUCT_MCT_DU_H3SP_USB232, 0)},
 200         {USB_VPI(USB_VENDOR_BELKIN, USB_PRODUCT_BELKIN_F5U109, 0)},
 201         {USB_VPI(USB_VENDOR_BELKIN, USB_PRODUCT_BELKIN_F5U409, 0)},
 202 };
 203
 204 static device_method_t umct_methods[] = {
 205         DEVMETHOD(device_probe, umct_probe),
 206         DEVMETHOD(device_attach, umct_attach),
 207         DEVMETHOD(device_detach, umct_detach),
 208         {0, 0}
 209 };
 210
 211 static devclass_t umct_devclass;
 212
 213 static driver_t umct_driver = {
 214         .name = "umct",
 215         .methods = umct_methods,
 216         .size = sizeof(struct umct_softc),
 217 };
 218
 219 DRIVER_MODULE(umct, uhub, umct_driver, umct_devclass, NULL, 0);
 220 MODULE_DEPEND(umct, ucom, 1, 1, 1);
 221 MODULE_DEPEND(umct, usb, 1, 1, 1);
 222
 223 static int
 224 umct_probe(device_t dev)
 225 {
 226         struct usb_attach_arg *uaa = device_get_ivars(dev);
 227
 228         if (uaa->usb_mode != USB_MODE_HOST) {
 229                 return (ENXIO);
 230         }
 231         if (uaa->info.bConfigIndex != UMCT_CONFIG_INDEX) {
 232                 return (ENXIO);
 233         }
 234         if (uaa->info.bIfaceIndex != UMCT_IFACE_INDEX) {
 235                 return (ENXIO);
 236         }
 237         return (usbd_lookup_id_by_uaa(umct_devs, sizeof(umct_devs), uaa));
 238 }
 239
 240 static int
 241 umct_attach(device_t dev)
 242 {
 243         struct usb_attach_arg *uaa = device_get_ivars(dev);
 244         struct umct_softc *sc = device_get_softc(dev);
 245         int32_t error;
 246         uint16_t maxp;
 247         uint8_t iface_index;
 248
 249         sc->sc_udev = uaa->device;
 250         sc->sc_unit = device_get_unit(dev);
 251
 252         device_set_usb_desc(dev);
 253         mtx_init(&sc->sc_mtx, "umct", NULL, MTX_DEF);
 254
 255         snprintf(sc->sc_name, sizeof(sc->sc_name),
 256             "%s", device_get_nameunit(dev));
 257
 258         sc->sc_iface_no = uaa->info.bIfaceNum;
 259
 260         iface_index = UMCT_IFACE_INDEX;
 261         error = usbd_transfer_setup(uaa->device, &iface_index,
 262             sc->sc_xfer, umct_config, UMCT_N_TRANSFER, sc, &sc->sc_mtx);
 263
 264         if (error) {
 265                 device_printf(dev, "allocating USB "
 266                     "transfers failed\n");
 267                 goto detach;
 268         }
 269
 270         /*
 271          * The real bulk-in endpoint is also marked as an interrupt.
 272          * The only way to differentiate it from the real interrupt
 273          * endpoint is to look at the wMaxPacketSize field.
 274          */
 275         maxp = usbd_xfer_max_framelen(sc->sc_xfer[UMCT_BULK_DT_RD]);
 276         if (maxp == 0x2) {
 277
 278                 /* guessed wrong - switch around endpoints */
 279
 280                 struct usb_xfer *temp = sc->sc_xfer[UMCT_INTR_DT_RD];
 281
 282                 sc->sc_xfer[UMCT_INTR_DT_RD] = sc->sc_xfer[UMCT_BULK_DT_RD];
 283                 sc->sc_xfer[UMCT_BULK_DT_RD] = temp;
 284                 sc->sc_swap_cb = 1;
 285         }
 286
 287         sc->sc_obufsize = usbd_xfer_max_len(sc->sc_xfer[UMCT_BULK_DT_WR]);
 288
 289         if (uaa->info.idProduct == USB_PRODUCT_MCT_SITECOM_USB232) {
 290                 if (sc->sc_obufsize > 16) {
 291                         sc->sc_obufsize = 16;
 292                 }
 293         }
 294         error = ucom_attach(&sc->sc_super_ucom, &sc->sc_ucom, 1, sc,
 295             &umct_callback, &sc->sc_mtx);
 296         if (error) {
 297                 goto detach;
 298         }
 299         return (0);                     /* success */
 300
 301 detach:
 302         umct_detach(dev);
 303         return (ENXIO);                 /* failure */
 304 }
 305
 306 static int
 307 umct_detach(device_t dev)
 308 {
 309         struct umct_softc *sc = device_get_softc(dev);
 310
 311         ucom_detach(&sc->sc_super_ucom, &sc->sc_ucom, 1);
 312         usbd_transfer_unsetup(sc->sc_xfer, UMCT_N_TRANSFER);
 313         mtx_destroy(&sc->sc_mtx);
 314
 315         return (0);
 316 }
 317
 318 static void
 319 umct_cfg_do_request(struct umct_softc *sc, uint8_t request,
 320     uint16_t len, uint32_t value)
 321 {
 322         struct usb_device_request req;
 323         usb_error_t err;
 324         uint8_t temp[4];
 325
 326         if (len > 4)
 327                 len = 4;
 328         req.bmRequestType = UT_WRITE_VENDOR_DEVICE;
 329         req.bRequest = request;
 330         USETW(req.wValue, 0);
 331         req.wIndex[0] = sc->sc_iface_no;
 332         req.wIndex[1] = 0;
 333         USETW(req.wLength, len);
 334         USETDW(temp, value);
 335
 336         err = ucom_cfg_do_request(sc->sc_udev, &sc->sc_ucom,
 337             &req, temp, 0, 1000);
 338         if (err) {
 339                 DPRINTFN(0, "device request failed, err=%s "
 340                     "(ignored)\n", usbd_errstr(err));
 341         }
 342         return;
 343 }
 344
 345 static void
 346 umct_intr_callback_sub(struct usb_xfer *xfer, usb_error_t error)
 347 {
 348         struct umct_softc *sc = usbd_xfer_softc(xfer);
 349         struct usb_page_cache *pc;
 350         uint8_t buf[2];
 351         int actlen;
 352
 353         usbd_xfer_status(xfer, &actlen, NULL, NULL, NULL);
 354
 355         switch (USB_GET_STATE(xfer)) {
 356         case USB_ST_TRANSFERRED:
 357                 if (actlen < 2) {
 358                         DPRINTF("too short message\n");
 359                         goto tr_setup;
 360                 }
 361                 pc = usbd_xfer_get_frame(xfer, 0);
 362                 usbd_copy_out(pc, 0, buf, sizeof(buf));
 363
 364                 sc->sc_msr = buf[0];
 365                 sc->sc_lsr = buf[1];
 366
 367                 ucom_status_change(&sc->sc_ucom);
 368
 369         case USB_ST_SETUP:
 370 tr_setup:
 371                 usbd_xfer_set_frame_len(xfer, 0, usbd_xfer_max_len(xfer));
 372                 usbd_transfer_submit(xfer);
 373                 return;
 374
 375         default:                        /* Error */
 376                 if (error != USB_ERR_CANCELLED) {
 377                         /* try to clear stall first */
 378                         usbd_xfer_set_stall(xfer);
 379                         goto tr_setup;
 380                 }
 381                 return;
 382         }
 383 }
 384
 385 static void
 386 umct_cfg_get_status(struct ucom_softc *ucom, uint8_t *lsr, uint8_t *msr)
 387 {
 388         struct umct_softc *sc = ucom->sc_parent;
 389
 390         *lsr = sc->sc_lsr;
 391         *msr = sc->sc_msr;
 392 }
 393
 394 static void
 395 umct_cfg_set_break(struct ucom_softc *ucom, uint8_t onoff)
 396 {
 397         struct umct_softc *sc = ucom->sc_parent;
 398
 399         if (onoff)
 400                 sc->sc_lcr |= 0x40;
 401         else
 402                 sc->sc_lcr &= ~0x40;
 403
 404         umct_cfg_do_request(sc, UMCT_SET_LCR, UMCT_SET_LCR_SIZE, sc->sc_lcr);
 405 }
 406
 407 static void
 408 umct_cfg_set_dtr(struct ucom_softc *ucom, uint8_t onoff)
 409 {
 410         struct umct_softc *sc = ucom->sc_parent;
 411
 412         if (onoff)
 413                 sc->sc_mcr |= 0x01;
 414         else
 415                 sc->sc_mcr &= ~0x01;
 416
 417         umct_cfg_do_request(sc, UMCT_SET_MCR, UMCT_SET_MCR_SIZE, sc->sc_mcr);
 418 }
 419
 420 static void
 421 umct_cfg_set_rts(struct ucom_softc *ucom, uint8_t onoff)
 422 {
 423         struct umct_softc *sc = ucom->sc_parent;
 424
 425         if (onoff)
 426                 sc->sc_mcr |= 0x02;
 427         else
 428                 sc->sc_mcr &= ~0x02;
 429
 430         umct_cfg_do_request(sc, UMCT_SET_MCR, UMCT_SET_MCR_SIZE, sc->sc_mcr);
 431 }
 432
 433 static uint8_t
 434 umct_calc_baud(uint32_t baud)
 435 {
 436         switch (baud) {
 437                 case B300:return (0x1);
 438         case B600:
 439                 return (0x2);
 440         case B1200:
 441                 return (0x3);
 442         case B2400:
 443                 return (0x4);
 444         case B4800:
 445                 return (0x6);
 446         case B9600:
 447                 return (0x8);
 448         case B19200:
 449                 return (0x9);
 450         case B38400:
 451                 return (0xa);
 452         case B57600:
 453                 return (0xb);
 454         case 115200:
 455                 return (0xc);
 456         case B0:
 457         default:
 458                 break;
 459         }
 460         return (0x0);
 461 }
 462
 463 static int
 464 umct_pre_param(struct ucom_softc *ucom, struct termios *t)
 465 {
 466         return (0);                     /* we accept anything */
 467 }
 468
 469 static void
 470 umct_cfg_param(struct ucom_softc *ucom, struct termios *t)
 471 {
 472         struct umct_softc *sc = ucom->sc_parent;
 473         uint32_t value;
 474
 475         value = umct_calc_baud(t->c_ospeed);
 476         umct_cfg_do_request(sc, UMCT_SET_BAUD, UMCT_SET_BAUD_SIZE, value);
 477
 478         value = (sc->sc_lcr & 0x40);
 479
 480         switch (t->c_cflag & CSIZE) {
 481         case CS5:
 482                 value |= 0x0;
 483                 break;
 484         case CS6:
 485                 value |= 0x1;
 486                 break;
 487         case CS7:
 488                 value |= 0x2;
 489                 break;
 490         default:
 491         case CS8:
 492                 value |= 0x3;
 493                 break;
 494         }
 495
 496         value |= (t->c_cflag & CSTOPB) ? 0x4 : 0;
 497         if (t->c_cflag & PARENB) {
 498                 value |= 0x8;
 499                 value |= (t->c_cflag & PARODD) ? 0x0 : 0x10;
 500         }
 501         /*
 502          * XXX There doesn't seem to be a way to tell the device
 503          * to use flow control.
 504          */
 505
 506         sc->sc_lcr = value;
 507         umct_cfg_do_request(sc, UMCT_SET_LCR, UMCT_SET_LCR_SIZE, value);
 508 }
 509
 510 static void
 511 umct_start_read(struct ucom_softc *ucom)
 512 {
 513         struct umct_softc *sc = ucom->sc_parent;
 514
 515         /* start interrupt endpoint */
 516         usbd_transfer_start(sc->sc_xfer[UMCT_INTR_DT_RD]);
 517
 518         /* start read endpoint */
 519         usbd_transfer_start(sc->sc_xfer[UMCT_BULK_DT_RD]);
 520 }
 521
 522 static void
 523 umct_stop_read(struct ucom_softc *ucom)
 524 {
 525         struct umct_softc *sc = ucom->sc_parent;
 526
 527         /* stop interrupt endpoint */
 528         usbd_transfer_stop(sc->sc_xfer[UMCT_INTR_DT_RD]);
 529
 530         /* stop read endpoint */
 531         usbd_transfer_stop(sc->sc_xfer[UMCT_BULK_DT_RD]);
 532 }
 533
 534 static void
 535 umct_start_write(struct ucom_softc *ucom)
 536 {
 537         struct umct_softc *sc = ucom->sc_parent;
 538
 539         usbd_transfer_start(sc->sc_xfer[UMCT_BULK_DT_WR]);
 540 }
 541
 542 static void
 543 umct_stop_write(struct ucom_softc *ucom)
 544 {
 545         struct umct_softc *sc = ucom->sc_parent;
 546
 547         usbd_transfer_stop(sc->sc_xfer[UMCT_BULK_DT_WR]);
 548 }
 549
 550 static void
 551 umct_read_callback(struct usb_xfer *xfer, usb_error_t error)
 552 {
 553         struct umct_softc *sc = usbd_xfer_softc(xfer);
 554
 555         if (sc->sc_swap_cb)
 556                 umct_intr_callback_sub(xfer, error);
 557         else
 558                 umct_read_callback_sub(xfer, error);
 559 }
 560
 561 static void
 562 umct_intr_callback(struct usb_xfer *xfer, usb_error_t error)
 563 {
 564         struct umct_softc *sc = usbd_xfer_softc(xfer);
 565
 566         if (sc->sc_swap_cb)
 567                 umct_read_callback_sub(xfer, error);
 568         else
 569                 umct_intr_callback_sub(xfer, error);
 570 }
 571
 572 static void
 573 umct_write_callback(struct usb_xfer *xfer, usb_error_t error)
 574 {
 575         struct umct_softc *sc = usbd_xfer_softc(xfer);
 576         struct usb_page_cache *pc;
 577         uint32_t actlen;
 578
 579         switch (USB_GET_STATE(xfer)) {
 580         case USB_ST_SETUP:
 581         case USB_ST_TRANSFERRED:
 582 tr_setup:
 583                 pc = usbd_xfer_get_frame(xfer, 0);
 584                 if (ucom_get_data(&sc->sc_ucom, pc, 0,
 585                     sc->sc_obufsize, &actlen)) {
 586
 587                         usbd_xfer_set_frame_len(xfer, 0, actlen);
 588                         usbd_transfer_submit(xfer);
 589                 }
 590                 return;
 591
 592         default:                        /* Error */
 593                 if (error != USB_ERR_CANCELLED) {
 594                         /* try to clear stall first */
 595                         usbd_xfer_set_stall(xfer);
 596                         goto tr_setup;
 597                 }
 598                 return;
 599         }
 600 }
 601
 602 static void
 603 umct_read_callback_sub(struct usb_xfer *xfer, usb_error_t error)
 604 {
 605         struct umct_softc *sc = usbd_xfer_softc(xfer);
 606         struct usb_page_cache *pc;
 607         int actlen;
 608
 609         usbd_xfer_status(xfer, &actlen, NULL, NULL, NULL);
 610
 611         switch (USB_GET_STATE(xfer)) {
 612         case USB_ST_TRANSFERRED:
 613                 pc = usbd_xfer_get_frame(xfer, 0);
 614                 ucom_put_data(&sc->sc_ucom, pc, 0, actlen);
 615
 616         case USB_ST_SETUP:
 617 tr_setup:
 618                 usbd_xfer_set_frame_len(xfer, 0, usbd_xfer_max_len(xfer));
 619                 usbd_transfer_submit(xfer);
 620                 return;
 621
 622         default:                        /* Error */
 623                 if (error != USB_ERR_CANCELLED) {
 624                         /* try to clear stall first */
 625                         usbd_xfer_set_stall(xfer);
 626                         goto tr_setup;
 627                 }
 628                 return;
 629         }
 630 }
 631
 632 static void
 633 umct_poll(struct ucom_softc *ucom)
 634 {
 635         struct umct_softc *sc = ucom->sc_parent;
 636         usbd_transfer_poll(sc->sc_xfer, UMCT_N_TRANSFER);
 637 }