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 MODULE_VERSION(umct, 1);
 223
 224 static int
 225 umct_probe(device_t dev)
 226 {
 227         struct usb_attach_arg *uaa = device_get_ivars(dev);
 228
 229         if (uaa->usb_mode != USB_MODE_HOST) {
 230                 return (ENXIO);
 231         }
 232         if (uaa->info.bConfigIndex != UMCT_CONFIG_INDEX) {
 233                 return (ENXIO);
 234         }
 235         if (uaa->info.bIfaceIndex != UMCT_IFACE_INDEX) {
 236                 return (ENXIO);
 237         }
 238         return (usbd_lookup_id_by_uaa(umct_devs, sizeof(umct_devs), uaa));
 239 }
 240
 241 static int
 242 umct_attach(device_t dev)
 243 {
 244         struct usb_attach_arg *uaa = device_get_ivars(dev);
 245         struct umct_softc *sc = device_get_softc(dev);
 246         int32_t error;
 247         uint16_t maxp;
 248         uint8_t iface_index;
 249
 250         sc->sc_udev = uaa->device;
 251         sc->sc_unit = device_get_unit(dev);
 252
 253         device_set_usb_desc(dev);
 254         mtx_init(&sc->sc_mtx, "umct", NULL, MTX_DEF);
 255
 256         snprintf(sc->sc_name, sizeof(sc->sc_name),
 257             "%s", device_get_nameunit(dev));
 258
 259         sc->sc_iface_no = uaa->info.bIfaceNum;
 260
 261         iface_index = UMCT_IFACE_INDEX;
 262         error = usbd_transfer_setup(uaa->device, &iface_index,
 263             sc->sc_xfer, umct_config, UMCT_N_TRANSFER, sc, &sc->sc_mtx);
 264
 265         if (error) {
 266                 device_printf(dev, "allocating USB "
 267                     "transfers failed\n");
 268                 goto detach;
 269         }
 270
 271         /*
 272          * The real bulk-in endpoint is also marked as an interrupt.
 273          * The only way to differentiate it from the real interrupt
 274          * endpoint is to look at the wMaxPacketSize field.
 275          */
 276         maxp = usbd_xfer_max_framelen(sc->sc_xfer[UMCT_BULK_DT_RD]);
 277         if (maxp == 0x2) {
 278
 279                 /* guessed wrong - switch around endpoints */
 280
 281                 struct usb_xfer *temp = sc->sc_xfer[UMCT_INTR_DT_RD];
 282
 283                 sc->sc_xfer[UMCT_INTR_DT_RD] = sc->sc_xfer[UMCT_BULK_DT_RD];
 284                 sc->sc_xfer[UMCT_BULK_DT_RD] = temp;
 285                 sc->sc_swap_cb = 1;
 286         }
 287
 288         sc->sc_obufsize = usbd_xfer_max_len(sc->sc_xfer[UMCT_BULK_DT_WR]);
 289
 290         if (uaa->info.idProduct == USB_PRODUCT_MCT_SITECOM_USB232) {
 291                 if (sc->sc_obufsize > 16) {
 292                         sc->sc_obufsize = 16;
 293                 }
 294         }
 295         error = ucom_attach(&sc->sc_super_ucom, &sc->sc_ucom, 1, sc,
 296             &umct_callback, &sc->sc_mtx);
 297         if (error) {
 298                 goto detach;
 299         }
 300         return (0);                     /* success */
 301
 302 detach:
 303         umct_detach(dev);
 304         return (ENXIO);                 /* failure */
 305 }
 306
 307 static int
 308 umct_detach(device_t dev)
 309 {
 310         struct umct_softc *sc = device_get_softc(dev);
 311
 312         ucom_detach(&sc->sc_super_ucom, &sc->sc_ucom, 1);
 313         usbd_transfer_unsetup(sc->sc_xfer, UMCT_N_TRANSFER);
 314         mtx_destroy(&sc->sc_mtx);
 315
 316         return (0);
 317 }
 318
 319 static void
 320 umct_cfg_do_request(struct umct_softc *sc, uint8_t request,
 321     uint16_t len, uint32_t value)
 322 {
 323         struct usb_device_request req;
 324         usb_error_t err;
 325         uint8_t temp[4];
 326
 327         if (len > 4)
 328                 len = 4;
 329         req.bmRequestType = UT_WRITE_VENDOR_DEVICE;
 330         req.bRequest = request;
 331         USETW(req.wValue, 0);
 332         req.wIndex[0] = sc->sc_iface_no;
 333         req.wIndex[1] = 0;
 334         USETW(req.wLength, len);
 335         USETDW(temp, value);
 336
 337         err = ucom_cfg_do_request(sc->sc_udev, &sc->sc_ucom,
 338             &req, temp, 0, 1000);
 339         if (err) {
 340                 DPRINTFN(0, "device request failed, err=%s "
 341                     "(ignored)\n", usbd_errstr(err));
 342         }
 343         return;
 344 }
 345
 346 static void
 347 umct_intr_callback_sub(struct usb_xfer *xfer, usb_error_t error)
 348 {
 349         struct umct_softc *sc = usbd_xfer_softc(xfer);
 350         struct usb_page_cache *pc;
 351         uint8_t buf[2];
 352         int actlen;
 353
 354         usbd_xfer_status(xfer, &actlen, NULL, NULL, NULL);
 355
 356         switch (USB_GET_STATE(xfer)) {
 357         case USB_ST_TRANSFERRED:
 358                 if (actlen < 2) {
 359                         DPRINTF("too short message\n");
 360                         goto tr_setup;
 361                 }
 362                 pc = usbd_xfer_get_frame(xfer, 0);
 363                 usbd_copy_out(pc, 0, buf, sizeof(buf));
 364
 365                 sc->sc_msr = buf[0];
 366                 sc->sc_lsr = buf[1];
 367
 368                 ucom_status_change(&sc->sc_ucom);
 369
 370         case USB_ST_SETUP:
 371 tr_setup:
 372                 usbd_xfer_set_frame_len(xfer, 0, usbd_xfer_max_len(xfer));
 373                 usbd_transfer_submit(xfer);
 374                 return;
 375
 376         default:                        /* Error */
 377                 if (error != USB_ERR_CANCELLED) {
 378                         /* try to clear stall first */
 379                         usbd_xfer_set_stall(xfer);
 380                         goto tr_setup;
 381                 }
 382                 return;
 383         }
 384 }
 385
 386 static void
 387 umct_cfg_get_status(struct ucom_softc *ucom, uint8_t *lsr, uint8_t *msr)
 388 {
 389         struct umct_softc *sc = ucom->sc_parent;
 390
 391         *lsr = sc->sc_lsr;
 392         *msr = sc->sc_msr;
 393 }
 394
 395 static void
 396 umct_cfg_set_break(struct ucom_softc *ucom, uint8_t onoff)
 397 {
 398         struct umct_softc *sc = ucom->sc_parent;
 399
 400         if (onoff)
 401                 sc->sc_lcr |= 0x40;
 402         else
 403                 sc->sc_lcr &= ~0x40;
 404
 405         umct_cfg_do_request(sc, UMCT_SET_LCR, UMCT_SET_LCR_SIZE, sc->sc_lcr);
 406 }
 407
 408 static void
 409 umct_cfg_set_dtr(struct ucom_softc *ucom, uint8_t onoff)
 410 {
 411         struct umct_softc *sc = ucom->sc_parent;
 412
 413         if (onoff)
 414                 sc->sc_mcr |= 0x01;
 415         else
 416                 sc->sc_mcr &= ~0x01;
 417
 418         umct_cfg_do_request(sc, UMCT_SET_MCR, UMCT_SET_MCR_SIZE, sc->sc_mcr);
 419 }
 420
 421 static void
 422 umct_cfg_set_rts(struct ucom_softc *ucom, uint8_t onoff)
 423 {
 424         struct umct_softc *sc = ucom->sc_parent;
 425
 426         if (onoff)
 427                 sc->sc_mcr |= 0x02;
 428         else
 429                 sc->sc_mcr &= ~0x02;
 430
 431         umct_cfg_do_request(sc, UMCT_SET_MCR, UMCT_SET_MCR_SIZE, sc->sc_mcr);
 432 }
 433
 434 static uint8_t
 435 umct_calc_baud(uint32_t baud)
 436 {
 437         switch (baud) {
 438                 case B300:return (0x1);
 439         case B600:
 440                 return (0x2);
 441         case B1200:
 442                 return (0x3);
 443         case B2400:
 444                 return (0x4);
 445         case B4800:
 446                 return (0x6);
 447         case B9600:
 448                 return (0x8);
 449         case B19200:
 450                 return (0x9);
 451         case B38400:
 452                 return (0xa);
 453         case B57600:
 454                 return (0xb);
 455         case 115200:
 456                 return (0xc);
 457         case B0:
 458         default:
 459                 break;
 460         }
 461         return (0x0);
 462 }
 463
 464 static int
 465 umct_pre_param(struct ucom_softc *ucom, struct termios *t)
 466 {
 467         return (0);                     /* we accept anything */
 468 }
 469
 470 static void
 471 umct_cfg_param(struct ucom_softc *ucom, struct termios *t)
 472 {
 473         struct umct_softc *sc = ucom->sc_parent;
 474         uint32_t value;
 475
 476         value = umct_calc_baud(t->c_ospeed);
 477         umct_cfg_do_request(sc, UMCT_SET_BAUD, UMCT_SET_BAUD_SIZE, value);
 478
 479         value = (sc->sc_lcr & 0x40);
 480
 481         switch (t->c_cflag & CSIZE) {
 482         case CS5:
 483                 value |= 0x0;
 484                 break;
 485         case CS6:
 486                 value |= 0x1;
 487                 break;
 488         case CS7:
 489                 value |= 0x2;
 490                 break;
 491         default:
 492         case CS8:
 493                 value |= 0x3;
 494                 break;
 495         }
 496
 497         value |= (t->c_cflag & CSTOPB) ? 0x4 : 0;
 498         if (t->c_cflag & PARENB) {
 499                 value |= 0x8;
 500                 value |= (t->c_cflag & PARODD) ? 0x0 : 0x10;
 501         }
 502         /*
 503          * XXX There doesn't seem to be a way to tell the device
 504          * to use flow control.
 505          */
 506
 507         sc->sc_lcr = value;
 508         umct_cfg_do_request(sc, UMCT_SET_LCR, UMCT_SET_LCR_SIZE, value);
 509 }
 510
 511 static void
 512 umct_start_read(struct ucom_softc *ucom)
 513 {
 514         struct umct_softc *sc = ucom->sc_parent;
 515
 516         /* start interrupt endpoint */
 517         usbd_transfer_start(sc->sc_xfer[UMCT_INTR_DT_RD]);
 518
 519         /* start read endpoint */
 520         usbd_transfer_start(sc->sc_xfer[UMCT_BULK_DT_RD]);
 521 }
 522
 523 static void
 524 umct_stop_read(struct ucom_softc *ucom)
 525 {
 526         struct umct_softc *sc = ucom->sc_parent;
 527
 528         /* stop interrupt endpoint */
 529         usbd_transfer_stop(sc->sc_xfer[UMCT_INTR_DT_RD]);
 530
 531         /* stop read endpoint */
 532         usbd_transfer_stop(sc->sc_xfer[UMCT_BULK_DT_RD]);
 533 }
 534
 535 static void
 536 umct_start_write(struct ucom_softc *ucom)
 537 {
 538         struct umct_softc *sc = ucom->sc_parent;
 539
 540         usbd_transfer_start(sc->sc_xfer[UMCT_BULK_DT_WR]);
 541 }
 542
 543 static void
 544 umct_stop_write(struct ucom_softc *ucom)
 545 {
 546         struct umct_softc *sc = ucom->sc_parent;
 547
 548         usbd_transfer_stop(sc->sc_xfer[UMCT_BULK_DT_WR]);
 549 }
 550
 551 static void
 552 umct_read_callback(struct usb_xfer *xfer, usb_error_t error)
 553 {
 554         struct umct_softc *sc = usbd_xfer_softc(xfer);
 555
 556         if (sc->sc_swap_cb)
 557                 umct_intr_callback_sub(xfer, error);
 558         else
 559                 umct_read_callback_sub(xfer, error);
 560 }
 561
 562 static void
 563 umct_intr_callback(struct usb_xfer *xfer, usb_error_t error)
 564 {
 565         struct umct_softc *sc = usbd_xfer_softc(xfer);
 566
 567         if (sc->sc_swap_cb)
 568                 umct_read_callback_sub(xfer, error);
 569         else
 570                 umct_intr_callback_sub(xfer, error);
 571 }
 572
 573 static void
 574 umct_write_callback(struct usb_xfer *xfer, usb_error_t error)
 575 {
 576         struct umct_softc *sc = usbd_xfer_softc(xfer);
 577         struct usb_page_cache *pc;
 578         uint32_t actlen;
 579
 580         switch (USB_GET_STATE(xfer)) {
 581         case USB_ST_SETUP:
 582         case USB_ST_TRANSFERRED:
 583 tr_setup:
 584                 pc = usbd_xfer_get_frame(xfer, 0);
 585                 if (ucom_get_data(&sc->sc_ucom, pc, 0,
 586                     sc->sc_obufsize, &actlen)) {
 587
 588                         usbd_xfer_set_frame_len(xfer, 0, actlen);
 589                         usbd_transfer_submit(xfer);
 590                 }
 591                 return;
 592
 593         default:                        /* Error */
 594                 if (error != USB_ERR_CANCELLED) {
 595                         /* try to clear stall first */
 596                         usbd_xfer_set_stall(xfer);
 597                         goto tr_setup;
 598                 }
 599                 return;
 600         }
 601 }
 602
 603 static void
 604 umct_read_callback_sub(struct usb_xfer *xfer, usb_error_t error)
 605 {
 606         struct umct_softc *sc = usbd_xfer_softc(xfer);
 607         struct usb_page_cache *pc;
 608         int actlen;
 609
 610         usbd_xfer_status(xfer, &actlen, NULL, NULL, NULL);
 611
 612         switch (USB_GET_STATE(xfer)) {
 613         case USB_ST_TRANSFERRED:
 614                 pc = usbd_xfer_get_frame(xfer, 0);
 615                 ucom_put_data(&sc->sc_ucom, pc, 0, actlen);
 616
 617         case USB_ST_SETUP:
 618 tr_setup:
 619                 usbd_xfer_set_frame_len(xfer, 0, usbd_xfer_max_len(xfer));
 620                 usbd_transfer_submit(xfer);
 621                 return;
 622
 623         default:                        /* Error */
 624                 if (error != USB_ERR_CANCELLED) {
 625                         /* try to clear stall first */
 626                         usbd_xfer_set_stall(xfer);
 627                         goto tr_setup;
 628                 }
 629                 return;
 630         }
 631 }
 632
 633 static void
 634 umct_poll(struct ucom_softc *ucom)
 635 {
 636         struct umct_softc *sc = ucom->sc_parent;
 637         usbd_transfer_poll(sc->sc_xfer, UMCT_N_TRANSFER);
 638 }