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/module.h>
  56 #include <sys/lock.h>
  57 #include <sys/mutex.h>
  58 #include <sys/condvar.h>
  59 #include <sys/sysctl.h>
  60 #include <sys/sx.h>
  61 #include <sys/unistd.h>
  62 #include <sys/callout.h>
  63 #include <sys/malloc.h>
  64 #include <sys/priv.h>
  65
  66 #include <dev/usb/usb.h>
  67 #include <dev/usb/usbdi.h>
  68 #include <dev/usb/usbdi_util.h>
  69 #include "usbdevs.h"
  70
  71 #define USB_DEBUG_VAR usb_debug
  72 #include <dev/usb/usb_debug.h>
  73 #include <dev/usb/usb_process.h>
  74
  75 #include <dev/usb/serial/usb_serial.h>
  76
  77 /* The UMCT advertises the standard 8250 UART registers */
  78 #define UMCT_GET_MSR            2       /* Get Modem Status Register */
  79 #define UMCT_GET_MSR_SIZE       1
  80 #define UMCT_GET_LCR            6       /* Get Line Control Register */
  81 #define UMCT_GET_LCR_SIZE       1
  82 #define UMCT_SET_BAUD           5       /* Set the Baud Rate Divisor */
  83 #define UMCT_SET_BAUD_SIZE      4
  84 #define UMCT_SET_LCR            7       /* Set Line Control Register */
  85 #define UMCT_SET_LCR_SIZE       1
  86 #define UMCT_SET_MCR            10      /* Set Modem Control Register */
  87 #define UMCT_SET_MCR_SIZE       1
  88
  89 #define UMCT_INTR_INTERVAL      100
  90 #define UMCT_IFACE_INDEX        0
  91 #define UMCT_CONFIG_INDEX       0
  92
  93 enum {
  94         UMCT_BULK_DT_WR,
  95         UMCT_BULK_DT_RD,
  96         UMCT_INTR_DT_RD,
  97         UMCT_N_TRANSFER,
  98 };
  99
 100 struct umct_softc {
 101         struct ucom_super_softc sc_super_ucom;
 102         struct ucom_softc sc_ucom;
 103
 104         struct usb_device *sc_udev;
 105         struct usb_xfer *sc_xfer[UMCT_N_TRANSFER];
 106         struct mtx sc_mtx;
 107
 108         uint32_t sc_unit;
 109
 110         uint16_t sc_obufsize;
 111
 112         uint8_t sc_lsr;
 113         uint8_t sc_msr;
 114         uint8_t sc_lcr;
 115         uint8_t sc_mcr;
 116         uint8_t sc_iface_no;
 117         uint8_t sc_swap_cb;
 118         uint8_t sc_name[16];
 119 };
 120
 121 /* prototypes */
 122
 123 static device_probe_t umct_probe;
 124 static device_attach_t umct_attach;
 125 static device_detach_t umct_detach;
 126
 127 static usb_callback_t umct_intr_callback;
 128 static usb_callback_t umct_intr_callback_sub;
 129 static usb_callback_t umct_read_callback;
 130 static usb_callback_t umct_read_callback_sub;
 131 static usb_callback_t umct_write_callback;
 132
 133 static void     umct_cfg_do_request(struct umct_softc *sc, uint8_t request,
 134                     uint16_t len, uint32_t value);
 135 static void     umct_cfg_get_status(struct ucom_softc *, uint8_t *,
 136                     uint8_t *);
 137 static void     umct_cfg_set_break(struct ucom_softc *, uint8_t);
 138 static void     umct_cfg_set_dtr(struct ucom_softc *, uint8_t);
 139 static void     umct_cfg_set_rts(struct ucom_softc *, uint8_t);
 140 static uint8_t  umct_calc_baud(uint32_t);
 141 static int      umct_pre_param(struct ucom_softc *, struct termios *);
 142 static void     umct_cfg_param(struct ucom_softc *, struct termios *);
 143 static void     umct_start_read(struct ucom_softc *);
 144 static void     umct_stop_read(struct ucom_softc *);
 145 static void     umct_start_write(struct ucom_softc *);
 146 static void     umct_stop_write(struct ucom_softc *);
 147 static void     umct_poll(struct ucom_softc *ucom);
 148
 149 static const struct usb_config umct_config[UMCT_N_TRANSFER] = {
 150
 151         [UMCT_BULK_DT_WR] = {
 152                 .type = UE_BULK,
 153                 .endpoint = UE_ADDR_ANY,
 154                 .direction = UE_DIR_OUT,
 155                 .bufsize = 0,   /* use wMaxPacketSize */
 156                 .flags = {.pipe_bof = 1,.force_short_xfer = 1,},
 157                 .callback = &umct_write_callback,
 158         },
 159
 160         [UMCT_BULK_DT_RD] = {
 161                 .type = UE_INTERRUPT,
 162                 .endpoint = UE_ADDR_ANY,
 163                 .direction = UE_DIR_IN,
 164                 .flags = {.pipe_bof = 1,.short_xfer_ok = 1,},
 165                 .bufsize = 0,   /* use wMaxPacketSize */
 166                 .callback = &umct_read_callback,
 167                 .ep_index = 0,          /* first interrupt endpoint */
 168         },
 169
 170         [UMCT_INTR_DT_RD] = {
 171                 .type = UE_INTERRUPT,
 172                 .endpoint = UE_ADDR_ANY,
 173                 .direction = UE_DIR_IN,
 174                 .flags = {.pipe_bof = 1,.short_xfer_ok = 1,},
 175                 .bufsize = 0,   /* use wMaxPacketSize */
 176                 .callback = &umct_intr_callback,
 177                 .ep_index = 1,          /* second interrupt endpoint */
 178         },
 179 };
 180
 181 static const struct ucom_callback umct_callback = {
 182         .ucom_cfg_get_status = &umct_cfg_get_status,
 183         .ucom_cfg_set_dtr = &umct_cfg_set_dtr,
 184         .ucom_cfg_set_rts = &umct_cfg_set_rts,
 185         .ucom_cfg_set_break = &umct_cfg_set_break,
 186         .ucom_cfg_param = &umct_cfg_param,
 187         .ucom_pre_param = &umct_pre_param,
 188         .ucom_start_read = &umct_start_read,
 189         .ucom_stop_read = &umct_stop_read,
 190         .ucom_start_write = &umct_start_write,
 191         .ucom_stop_write = &umct_stop_write,
 192         .ucom_poll = &umct_poll,
 193 };
 194
 195 static const STRUCT_USB_HOST_ID umct_devs[] = {
 196         {USB_VPI(USB_VENDOR_MCT, USB_PRODUCT_MCT_USB232, 0)},
 197         {USB_VPI(USB_VENDOR_MCT, USB_PRODUCT_MCT_SITECOM_USB232, 0)},
 198         {USB_VPI(USB_VENDOR_MCT, USB_PRODUCT_MCT_DU_H3SP_USB232, 0)},
 199         {USB_VPI(USB_VENDOR_BELKIN, USB_PRODUCT_BELKIN_F5U109, 0)},
 200         {USB_VPI(USB_VENDOR_BELKIN, USB_PRODUCT_BELKIN_F5U409, 0)},
 201 };
 202
 203 static device_method_t umct_methods[] = {
 204         DEVMETHOD(device_probe, umct_probe),
 205         DEVMETHOD(device_attach, umct_attach),
 206         DEVMETHOD(device_detach, umct_detach),
 207         {0, 0}
 208 };
 209
 210 static devclass_t umct_devclass;
 211
 212 static driver_t umct_driver = {
 213         .name = "umct",
 214         .methods = umct_methods,
 215         .size = sizeof(struct umct_softc),
 216 };
 217
 218 DRIVER_MODULE(umct, uhub, umct_driver, umct_devclass, NULL, 0);
 219 MODULE_DEPEND(umct, ucom, 1, 1, 1);
 220 MODULE_DEPEND(umct, usb, 1, 1, 1);
 221 MODULE_VERSION(umct, 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         ucom_set_pnpinfo_usb(&sc->sc_super_ucom, dev);
 300
 301         return (0);                     /* success */
 302
 303 detach:
 304         umct_detach(dev);
 305         return (ENXIO);                 /* failure */
 306 }
 307
 308 static int
 309 umct_detach(device_t dev)
 310 {
 311         struct umct_softc *sc = device_get_softc(dev);
 312
 313         ucom_detach(&sc->sc_super_ucom, &sc->sc_ucom);
 314         usbd_transfer_unsetup(sc->sc_xfer, UMCT_N_TRANSFER);
 315         mtx_destroy(&sc->sc_mtx);
 316
 317         return (0);
 318 }
 319
 320 static void
 321 umct_cfg_do_request(struct umct_softc *sc, uint8_t request,
 322     uint16_t len, uint32_t value)
 323 {
 324         struct usb_device_request req;
 325         usb_error_t err;
 326         uint8_t temp[4];
 327
 328         if (len > 4)
 329                 len = 4;
 330         req.bmRequestType = UT_WRITE_VENDOR_DEVICE;
 331         req.bRequest = request;
 332         USETW(req.wValue, 0);
 333         req.wIndex[0] = sc->sc_iface_no;
 334         req.wIndex[1] = 0;
 335         USETW(req.wLength, len);
 336         USETDW(temp, value);
 337
 338         err = ucom_cfg_do_request(sc->sc_udev, &sc->sc_ucom,
 339             &req, temp, 0, 1000);
 340         if (err) {
 341                 DPRINTFN(0, "device request failed, err=%s "
 342                     "(ignored)\n", usbd_errstr(err));
 343         }
 344         return;
 345 }
 346
 347 static void
 348 umct_intr_callback_sub(struct usb_xfer *xfer, usb_error_t error)
 349 {
 350         struct umct_softc *sc = usbd_xfer_softc(xfer);
 351         struct usb_page_cache *pc;
 352         uint8_t buf[2];
 353         int actlen;
 354
 355         usbd_xfer_status(xfer, &actlen, NULL, NULL, NULL);
 356
 357         switch (USB_GET_STATE(xfer)) {
 358         case USB_ST_TRANSFERRED:
 359                 if (actlen < 2) {
 360                         DPRINTF("too short message\n");
 361                         goto tr_setup;
 362                 }
 363                 pc = usbd_xfer_get_frame(xfer, 0);
 364                 usbd_copy_out(pc, 0, buf, sizeof(buf));
 365
 366                 sc->sc_msr = buf[0];
 367                 sc->sc_lsr = buf[1];
 368
 369                 ucom_status_change(&sc->sc_ucom);
 370
 371         case USB_ST_SETUP:
 372 tr_setup:
 373                 usbd_xfer_set_frame_len(xfer, 0, usbd_xfer_max_len(xfer));
 374                 usbd_transfer_submit(xfer);
 375                 return;
 376
 377         default:                        /* Error */
 378                 if (error != USB_ERR_CANCELLED) {
 379                         /* try to clear stall first */
 380                         usbd_xfer_set_stall(xfer);
 381                         goto tr_setup;
 382                 }
 383                 return;
 384         }
 385 }
 386
 387 static void
 388 umct_cfg_get_status(struct ucom_softc *ucom, uint8_t *lsr, uint8_t *msr)
 389 {
 390         struct umct_softc *sc = ucom->sc_parent;
 391
 392         *lsr = sc->sc_lsr;
 393         *msr = sc->sc_msr;
 394 }
 395
 396 static void
 397 umct_cfg_set_break(struct ucom_softc *ucom, uint8_t onoff)
 398 {
 399         struct umct_softc *sc = ucom->sc_parent;
 400
 401         if (onoff)
 402                 sc->sc_lcr |= 0x40;
 403         else
 404                 sc->sc_lcr &= ~0x40;
 405
 406         umct_cfg_do_request(sc, UMCT_SET_LCR, UMCT_SET_LCR_SIZE, sc->sc_lcr);
 407 }
 408
 409 static void
 410 umct_cfg_set_dtr(struct ucom_softc *ucom, uint8_t onoff)
 411 {
 412         struct umct_softc *sc = ucom->sc_parent;
 413
 414         if (onoff)
 415                 sc->sc_mcr |= 0x01;
 416         else
 417                 sc->sc_mcr &= ~0x01;
 418
 419         umct_cfg_do_request(sc, UMCT_SET_MCR, UMCT_SET_MCR_SIZE, sc->sc_mcr);
 420 }
 421
 422 static void
 423 umct_cfg_set_rts(struct ucom_softc *ucom, uint8_t onoff)
 424 {
 425         struct umct_softc *sc = ucom->sc_parent;
 426
 427         if (onoff)
 428                 sc->sc_mcr |= 0x02;
 429         else
 430                 sc->sc_mcr &= ~0x02;
 431
 432         umct_cfg_do_request(sc, UMCT_SET_MCR, UMCT_SET_MCR_SIZE, sc->sc_mcr);
 433 }
 434
 435 static uint8_t
 436 umct_calc_baud(uint32_t baud)
 437 {
 438         switch (baud) {
 439                 case B300:return (0x1);
 440         case B600:
 441                 return (0x2);
 442         case B1200:
 443                 return (0x3);
 444         case B2400:
 445                 return (0x4);
 446         case B4800:
 447                 return (0x6);
 448         case B9600:
 449                 return (0x8);
 450         case B19200:
 451                 return (0x9);
 452         case B38400:
 453                 return (0xa);
 454         case B57600:
 455                 return (0xb);
 456         case 115200:
 457                 return (0xc);
 458         case B0:
 459         default:
 460                 break;
 461         }
 462         return (0x0);
 463 }
 464
 465 static int
 466 umct_pre_param(struct ucom_softc *ucom, struct termios *t)
 467 {
 468         return (0);                     /* we accept anything */
 469 }
 470
 471 static void
 472 umct_cfg_param(struct ucom_softc *ucom, struct termios *t)
 473 {
 474         struct umct_softc *sc = ucom->sc_parent;
 475         uint32_t value;
 476
 477         value = umct_calc_baud(t->c_ospeed);
 478         umct_cfg_do_request(sc, UMCT_SET_BAUD, UMCT_SET_BAUD_SIZE, value);
 479
 480         value = (sc->sc_lcr & 0x40);
 481
 482         switch (t->c_cflag & CSIZE) {
 483         case CS5:
 484                 value |= 0x0;
 485                 break;
 486         case CS6:
 487                 value |= 0x1;
 488                 break;
 489         case CS7:
 490                 value |= 0x2;
 491                 break;
 492         default:
 493         case CS8:
 494                 value |= 0x3;
 495                 break;
 496         }
 497
 498         value |= (t->c_cflag & CSTOPB) ? 0x4 : 0;
 499         if (t->c_cflag & PARENB) {
 500                 value |= 0x8;
 501                 value |= (t->c_cflag & PARODD) ? 0x0 : 0x10;
 502         }
 503         /*
 504          * XXX There doesn't seem to be a way to tell the device
 505          * to use flow control.
 506          */
 507
 508         sc->sc_lcr = value;
 509         umct_cfg_do_request(sc, UMCT_SET_LCR, UMCT_SET_LCR_SIZE, value);
 510 }
 511
 512 static void
 513 umct_start_read(struct ucom_softc *ucom)
 514 {
 515         struct umct_softc *sc = ucom->sc_parent;
 516
 517         /* start interrupt endpoint */
 518         usbd_transfer_start(sc->sc_xfer[UMCT_INTR_DT_RD]);
 519
 520         /* start read endpoint */
 521         usbd_transfer_start(sc->sc_xfer[UMCT_BULK_DT_RD]);
 522 }
 523
 524 static void
 525 umct_stop_read(struct ucom_softc *ucom)
 526 {
 527         struct umct_softc *sc = ucom->sc_parent;
 528
 529         /* stop interrupt endpoint */
 530         usbd_transfer_stop(sc->sc_xfer[UMCT_INTR_DT_RD]);
 531
 532         /* stop read endpoint */
 533         usbd_transfer_stop(sc->sc_xfer[UMCT_BULK_DT_RD]);
 534 }
 535
 536 static void
 537 umct_start_write(struct ucom_softc *ucom)
 538 {
 539         struct umct_softc *sc = ucom->sc_parent;
 540
 541         usbd_transfer_start(sc->sc_xfer[UMCT_BULK_DT_WR]);
 542 }
 543
 544 static void
 545 umct_stop_write(struct ucom_softc *ucom)
 546 {
 547         struct umct_softc *sc = ucom->sc_parent;
 548
 549         usbd_transfer_stop(sc->sc_xfer[UMCT_BULK_DT_WR]);
 550 }
 551
 552 static void
 553 umct_read_callback(struct usb_xfer *xfer, usb_error_t error)
 554 {
 555         struct umct_softc *sc = usbd_xfer_softc(xfer);
 556
 557         if (sc->sc_swap_cb)
 558                 umct_intr_callback_sub(xfer, error);
 559         else
 560                 umct_read_callback_sub(xfer, error);
 561 }
 562
 563 static void
 564 umct_intr_callback(struct usb_xfer *xfer, usb_error_t error)
 565 {
 566         struct umct_softc *sc = usbd_xfer_softc(xfer);
 567
 568         if (sc->sc_swap_cb)
 569                 umct_read_callback_sub(xfer, error);
 570         else
 571                 umct_intr_callback_sub(xfer, error);
 572 }
 573
 574 static void
 575 umct_write_callback(struct usb_xfer *xfer, usb_error_t error)
 576 {
 577         struct umct_softc *sc = usbd_xfer_softc(xfer);
 578         struct usb_page_cache *pc;
 579         uint32_t actlen;
 580
 581         switch (USB_GET_STATE(xfer)) {
 582         case USB_ST_SETUP:
 583         case USB_ST_TRANSFERRED:
 584 tr_setup:
 585                 pc = usbd_xfer_get_frame(xfer, 0);
 586                 if (ucom_get_data(&sc->sc_ucom, pc, 0,
 587                     sc->sc_obufsize, &actlen)) {
 588
 589                         usbd_xfer_set_frame_len(xfer, 0, actlen);
 590                         usbd_transfer_submit(xfer);
 591                 }
 592                 return;
 593
 594         default:                        /* Error */
 595                 if (error != USB_ERR_CANCELLED) {
 596                         /* try to clear stall first */
 597                         usbd_xfer_set_stall(xfer);
 598                         goto tr_setup;
 599                 }
 600                 return;
 601         }
 602 }
 603
 604 static void
 605 umct_read_callback_sub(struct usb_xfer *xfer, usb_error_t error)
 606 {
 607         struct umct_softc *sc = usbd_xfer_softc(xfer);
 608         struct usb_page_cache *pc;
 609         int actlen;
 610
 611         usbd_xfer_status(xfer, &actlen, NULL, NULL, NULL);
 612
 613         switch (USB_GET_STATE(xfer)) {
 614         case USB_ST_TRANSFERRED:
 615                 pc = usbd_xfer_get_frame(xfer, 0);
 616                 ucom_put_data(&sc->sc_ucom, pc, 0, actlen);
 617
 618         case USB_ST_SETUP:
 619 tr_setup:
 620                 usbd_xfer_set_frame_len(xfer, 0, usbd_xfer_max_len(xfer));
 621                 usbd_transfer_submit(xfer);
 622                 return;
 623
 624         default:                        /* Error */
 625                 if (error != USB_ERR_CANCELLED) {
 626                         /* try to clear stall first */
 627                         usbd_xfer_set_stall(xfer);
 628                         goto tr_setup;
 629                 }
 630                 return;
 631         }
 632 }
 633
 634 static void
 635 umct_poll(struct ucom_softc *ucom)
 636 {
 637         struct umct_softc *sc = ucom->sc_parent;
 638         usbd_transfer_poll(sc->sc_xfer, UMCT_N_TRANSFER);
 639 }