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_MSR_CTS_CHG        0x01
  90 #define UMCT_MSR_DSR_CHG        0x02
  91 #define UMCT_MSR_RI_CHG         0x04
  92 #define UMCT_MSR_CD_CHG         0x08
  93 #define UMCT_MSR_CTS            0x10
  94 #define UMCT_MSR_RTS            0x20
  95 #define UMCT_MSR_RI             0x40
  96 #define UMCT_MSR_CD             0x80
  97
  98 #define UMCT_INTR_INTERVAL      100
  99 #define UMCT_IFACE_INDEX        0
 100 #define UMCT_CONFIG_INDEX       0
 101
 102 enum {
 103         UMCT_BULK_DT_WR,
 104         UMCT_BULK_DT_RD,
 105         UMCT_INTR_DT_RD,
 106         UMCT_N_TRANSFER,
 107 };
 108
 109 struct umct_softc {
 110         struct ucom_super_softc sc_super_ucom;
 111         struct ucom_softc sc_ucom;
 112
 113         struct usb_device *sc_udev;
 114         struct usb_xfer *sc_xfer[UMCT_N_TRANSFER];
 115         struct mtx sc_mtx;
 116
 117         uint32_t sc_unit;
 118
 119         uint16_t sc_obufsize;
 120
 121         uint8_t sc_lsr;
 122         uint8_t sc_msr;
 123         uint8_t sc_lcr;
 124         uint8_t sc_mcr;
 125         uint8_t sc_iface_no;
 126         uint8_t sc_swap_cb;
 127 };
 128
 129 /* prototypes */
 130
 131 static device_probe_t umct_probe;
 132 static device_attach_t umct_attach;
 133 static device_detach_t umct_detach;
 134 static void umct_free_softc(struct umct_softc *);
 135
 136 static usb_callback_t umct_intr_callback;
 137 static usb_callback_t umct_intr_callback_sub;
 138 static usb_callback_t umct_read_callback;
 139 static usb_callback_t umct_read_callback_sub;
 140 static usb_callback_t umct_write_callback;
 141
 142 static void     umct_cfg_do_request(struct umct_softc *sc, uint8_t request,
 143                     uint16_t len, uint32_t value);
 144 static void     umct_free(struct ucom_softc *);
 145 static void     umct_cfg_get_status(struct ucom_softc *, uint8_t *,
 146                     uint8_t *);
 147 static void     umct_cfg_set_break(struct ucom_softc *, uint8_t);
 148 static void     umct_cfg_set_dtr(struct ucom_softc *, uint8_t);
 149 static void     umct_cfg_set_rts(struct ucom_softc *, uint8_t);
 150 static uint8_t  umct_calc_baud(uint32_t);
 151 static int      umct_pre_param(struct ucom_softc *, struct termios *);
 152 static void     umct_cfg_param(struct ucom_softc *, struct termios *);
 153 static void     umct_start_read(struct ucom_softc *);
 154 static void     umct_stop_read(struct ucom_softc *);
 155 static void     umct_start_write(struct ucom_softc *);
 156 static void     umct_stop_write(struct ucom_softc *);
 157 static void     umct_poll(struct ucom_softc *ucom);
 158
 159 static const struct usb_config umct_config[UMCT_N_TRANSFER] = {
 160
 161         [UMCT_BULK_DT_WR] = {
 162                 .type = UE_BULK,
 163                 .endpoint = UE_ADDR_ANY,
 164                 .direction = UE_DIR_OUT,
 165                 .bufsize = 0,   /* use wMaxPacketSize */
 166                 .flags = {.pipe_bof = 1,.force_short_xfer = 1,},
 167                 .callback = &umct_write_callback,
 168         },
 169
 170         [UMCT_BULK_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_read_callback,
 177                 .ep_index = 0,          /* first interrupt endpoint */
 178         },
 179
 180         [UMCT_INTR_DT_RD] = {
 181                 .type = UE_INTERRUPT,
 182                 .endpoint = UE_ADDR_ANY,
 183                 .direction = UE_DIR_IN,
 184                 .flags = {.pipe_bof = 1,.short_xfer_ok = 1,},
 185                 .bufsize = 0,   /* use wMaxPacketSize */
 186                 .callback = &umct_intr_callback,
 187                 .ep_index = 1,          /* second interrupt endpoint */
 188         },
 189 };
 190
 191 static const struct ucom_callback umct_callback = {
 192         .ucom_cfg_get_status = &umct_cfg_get_status,
 193         .ucom_cfg_set_dtr = &umct_cfg_set_dtr,
 194         .ucom_cfg_set_rts = &umct_cfg_set_rts,
 195         .ucom_cfg_set_break = &umct_cfg_set_break,
 196         .ucom_cfg_param = &umct_cfg_param,
 197         .ucom_pre_param = &umct_pre_param,
 198         .ucom_start_read = &umct_start_read,
 199         .ucom_stop_read = &umct_stop_read,
 200         .ucom_start_write = &umct_start_write,
 201         .ucom_stop_write = &umct_stop_write,
 202         .ucom_poll = &umct_poll,
 203         .ucom_free = &umct_free,
 204 };
 205
 206 static const STRUCT_USB_HOST_ID umct_devs[] = {
 207         {USB_VPI(USB_VENDOR_MCT, USB_PRODUCT_MCT_USB232, 0)},
 208         {USB_VPI(USB_VENDOR_MCT, USB_PRODUCT_MCT_SITECOM_USB232, 0)},
 209         {USB_VPI(USB_VENDOR_MCT, USB_PRODUCT_MCT_DU_H3SP_USB232, 0)},
 210         {USB_VPI(USB_VENDOR_BELKIN, USB_PRODUCT_BELKIN_F5U109, 0)},
 211         {USB_VPI(USB_VENDOR_BELKIN, USB_PRODUCT_BELKIN_F5U409, 0)},
 212 };
 213
 214 static device_method_t umct_methods[] = {
 215         DEVMETHOD(device_probe, umct_probe),
 216         DEVMETHOD(device_attach, umct_attach),
 217         DEVMETHOD(device_detach, umct_detach),
 218         DEVMETHOD_END
 219 };
 220
 221 static devclass_t umct_devclass;
 222
 223 static driver_t umct_driver = {
 224         .name = "umct",
 225         .methods = umct_methods,
 226         .size = sizeof(struct umct_softc),
 227 };
 228
 229 DRIVER_MODULE(umct, uhub, umct_driver, umct_devclass, NULL, 0);
 230 MODULE_DEPEND(umct, ucom, 1, 1, 1);
 231 MODULE_DEPEND(umct, usb, 1, 1, 1);
 232 MODULE_VERSION(umct, 1);
 233 USB_PNP_HOST_INFO(umct_devs);
 234
 235 static int
 236 umct_probe(device_t dev)
 237 {
 238         struct usb_attach_arg *uaa = device_get_ivars(dev);
 239
 240         if (uaa->usb_mode != USB_MODE_HOST) {
 241                 return (ENXIO);
 242         }
 243         if (uaa->info.bConfigIndex != UMCT_CONFIG_INDEX) {
 244                 return (ENXIO);
 245         }
 246         if (uaa->info.bIfaceIndex != UMCT_IFACE_INDEX) {
 247                 return (ENXIO);
 248         }
 249         return (usbd_lookup_id_by_uaa(umct_devs, sizeof(umct_devs), uaa));
 250 }
 251
 252 static int
 253 umct_attach(device_t dev)
 254 {
 255         struct usb_attach_arg *uaa = device_get_ivars(dev);
 256         struct umct_softc *sc = device_get_softc(dev);
 257         int32_t error;
 258         uint16_t maxp;
 259         uint8_t iface_index;
 260
 261         sc->sc_udev = uaa->device;
 262         sc->sc_unit = device_get_unit(dev);
 263
 264         device_set_usb_desc(dev);
 265         mtx_init(&sc->sc_mtx, "umct", NULL, MTX_DEF);
 266         ucom_ref(&sc->sc_super_ucom);
 267
 268         sc->sc_iface_no = uaa->info.bIfaceNum;
 269
 270         iface_index = UMCT_IFACE_INDEX;
 271         error = usbd_transfer_setup(uaa->device, &iface_index,
 272             sc->sc_xfer, umct_config, UMCT_N_TRANSFER, sc, &sc->sc_mtx);
 273
 274         if (error) {
 275                 device_printf(dev, "allocating USB "
 276                     "transfers failed\n");
 277                 goto detach;
 278         }
 279
 280         /*
 281          * The real bulk-in endpoint is also marked as an interrupt.
 282          * The only way to differentiate it from the real interrupt
 283          * endpoint is to look at the wMaxPacketSize field.
 284          */
 285         maxp = usbd_xfer_max_framelen(sc->sc_xfer[UMCT_BULK_DT_RD]);
 286         if (maxp == 0x2) {
 287
 288                 /* guessed wrong - switch around endpoints */
 289
 290                 struct usb_xfer *temp = sc->sc_xfer[UMCT_INTR_DT_RD];
 291
 292                 sc->sc_xfer[UMCT_INTR_DT_RD] = sc->sc_xfer[UMCT_BULK_DT_RD];
 293                 sc->sc_xfer[UMCT_BULK_DT_RD] = temp;
 294                 sc->sc_swap_cb = 1;
 295         }
 296
 297         sc->sc_obufsize = usbd_xfer_max_len(sc->sc_xfer[UMCT_BULK_DT_WR]);
 298
 299         if (uaa->info.idProduct == USB_PRODUCT_MCT_SITECOM_USB232) {
 300                 if (sc->sc_obufsize > 16) {
 301                         sc->sc_obufsize = 16;
 302                 }
 303         }
 304         error = ucom_attach(&sc->sc_super_ucom, &sc->sc_ucom, 1, sc,
 305             &umct_callback, &sc->sc_mtx);
 306         if (error) {
 307                 goto detach;
 308         }
 309         ucom_set_pnpinfo_usb(&sc->sc_super_ucom, dev);
 310
 311         return (0);                     /* success */
 312
 313 detach:
 314         umct_detach(dev);
 315         return (ENXIO);                 /* failure */
 316 }
 317
 318 static int
 319 umct_detach(device_t dev)
 320 {
 321         struct umct_softc *sc = device_get_softc(dev);
 322
 323         ucom_detach(&sc->sc_super_ucom, &sc->sc_ucom);
 324         usbd_transfer_unsetup(sc->sc_xfer, UMCT_N_TRANSFER);
 325
 326         device_claim_softc(dev);
 327
 328         umct_free_softc(sc);
 329
 330         return (0);
 331 }
 332
 333 UCOM_UNLOAD_DRAIN(umct);
 334
 335 static void
 336 umct_free_softc(struct umct_softc *sc)
 337 {
 338         if (ucom_unref(&sc->sc_super_ucom)) {
 339                 mtx_destroy(&sc->sc_mtx);
 340                 device_free_softc(sc);
 341         }
 342 }
 343
 344 static void
 345 umct_free(struct ucom_softc *ucom)
 346 {
 347         umct_free_softc(ucom->sc_parent);
 348 }
 349
 350 static void
 351 umct_cfg_do_request(struct umct_softc *sc, uint8_t request,
 352     uint16_t len, uint32_t value)
 353 {
 354         struct usb_device_request req;
 355         usb_error_t err;
 356         uint8_t temp[4];
 357
 358         if (len > 4)
 359                 len = 4;
 360         req.bmRequestType = UT_WRITE_VENDOR_DEVICE;
 361         req.bRequest = request;
 362         USETW(req.wValue, 0);
 363         req.wIndex[0] = sc->sc_iface_no;
 364         req.wIndex[1] = 0;
 365         USETW(req.wLength, len);
 366         USETDW(temp, value);
 367
 368         err = ucom_cfg_do_request(sc->sc_udev, &sc->sc_ucom,
 369             &req, temp, 0, 1000);
 370         if (err) {
 371                 DPRINTFN(0, "device request failed, err=%s "
 372                     "(ignored)\n", usbd_errstr(err));
 373         }
 374         return;
 375 }
 376
 377 static void
 378 umct_intr_callback_sub(struct usb_xfer *xfer, usb_error_t error)
 379 {
 380         struct umct_softc *sc = usbd_xfer_softc(xfer);
 381         struct usb_page_cache *pc;
 382         uint8_t buf[2];
 383         int actlen;
 384
 385         usbd_xfer_status(xfer, &actlen, NULL, NULL, NULL);
 386
 387         switch (USB_GET_STATE(xfer)) {
 388         case USB_ST_TRANSFERRED:
 389                 if (actlen < 2) {
 390                         DPRINTF("too short message\n");
 391                         goto tr_setup;
 392                 }
 393                 pc = usbd_xfer_get_frame(xfer, 0);
 394                 usbd_copy_out(pc, 0, buf, sizeof(buf));
 395
 396                 /*
 397                  * MSR bits need translation from ns16550 to SER_* values.
 398                  * LSR bits are ns16550 in hardware and ucom.
 399                  */
 400                 sc->sc_msr = 0;
 401                 if (buf[0] & UMCT_MSR_CTS)
 402                         sc->sc_msr |= SER_CTS;
 403                 if (buf[0] & UMCT_MSR_CD)
 404                         sc->sc_msr |= SER_DCD;
 405                 if (buf[0] & UMCT_MSR_RI)
 406                         sc->sc_msr |= SER_RI;
 407                 if (buf[0] & UMCT_MSR_RTS)
 408                         sc->sc_msr |= SER_DSR;
 409                 sc->sc_lsr = buf[1];
 410
 411                 ucom_status_change(&sc->sc_ucom);
 412                 /* FALLTHROUGH */
 413         case USB_ST_SETUP:
 414 tr_setup:
 415                 usbd_xfer_set_frame_len(xfer, 0, usbd_xfer_max_len(xfer));
 416                 usbd_transfer_submit(xfer);
 417                 return;
 418
 419         default:                        /* Error */
 420                 if (error != USB_ERR_CANCELLED) {
 421                         /* try to clear stall first */
 422                         usbd_xfer_set_stall(xfer);
 423                         goto tr_setup;
 424                 }
 425                 return;
 426         }
 427 }
 428
 429 static void
 430 umct_cfg_get_status(struct ucom_softc *ucom, uint8_t *lsr, uint8_t *msr)
 431 {
 432         struct umct_softc *sc = ucom->sc_parent;
 433
 434         *lsr = sc->sc_lsr;
 435         *msr = sc->sc_msr;
 436 }
 437
 438 static void
 439 umct_cfg_set_break(struct ucom_softc *ucom, uint8_t onoff)
 440 {
 441         struct umct_softc *sc = ucom->sc_parent;
 442
 443         if (onoff)
 444                 sc->sc_lcr |= 0x40;
 445         else
 446                 sc->sc_lcr &= ~0x40;
 447
 448         umct_cfg_do_request(sc, UMCT_SET_LCR, UMCT_SET_LCR_SIZE, sc->sc_lcr);
 449 }
 450
 451 static void
 452 umct_cfg_set_dtr(struct ucom_softc *ucom, uint8_t onoff)
 453 {
 454         struct umct_softc *sc = ucom->sc_parent;
 455
 456         if (onoff)
 457                 sc->sc_mcr |= 0x01;
 458         else
 459                 sc->sc_mcr &= ~0x01;
 460
 461         umct_cfg_do_request(sc, UMCT_SET_MCR, UMCT_SET_MCR_SIZE, sc->sc_mcr);
 462 }
 463
 464 static void
 465 umct_cfg_set_rts(struct ucom_softc *ucom, uint8_t onoff)
 466 {
 467         struct umct_softc *sc = ucom->sc_parent;
 468
 469         if (onoff)
 470                 sc->sc_mcr |= 0x02;
 471         else
 472                 sc->sc_mcr &= ~0x02;
 473
 474         umct_cfg_do_request(sc, UMCT_SET_MCR, UMCT_SET_MCR_SIZE, sc->sc_mcr);
 475 }
 476
 477 static uint8_t
 478 umct_calc_baud(uint32_t baud)
 479 {
 480         switch (baud) {
 481                 case B300:return (0x1);
 482         case B600:
 483                 return (0x2);
 484         case B1200:
 485                 return (0x3);
 486         case B2400:
 487                 return (0x4);
 488         case B4800:
 489                 return (0x6);
 490         case B9600:
 491                 return (0x8);
 492         case B19200:
 493                 return (0x9);
 494         case B38400:
 495                 return (0xa);
 496         case B57600:
 497                 return (0xb);
 498         case 115200:
 499                 return (0xc);
 500         case B0:
 501         default:
 502                 break;
 503         }
 504         return (0x0);
 505 }
 506
 507 static int
 508 umct_pre_param(struct ucom_softc *ucom, struct termios *t)
 509 {
 510         return (0);                     /* we accept anything */
 511 }
 512
 513 static void
 514 umct_cfg_param(struct ucom_softc *ucom, struct termios *t)
 515 {
 516         struct umct_softc *sc = ucom->sc_parent;
 517         uint32_t value;
 518
 519         value = umct_calc_baud(t->c_ospeed);
 520         umct_cfg_do_request(sc, UMCT_SET_BAUD, UMCT_SET_BAUD_SIZE, value);
 521
 522         value = (sc->sc_lcr & 0x40);
 523
 524         switch (t->c_cflag & CSIZE) {
 525         case CS5:
 526                 value |= 0x0;
 527                 break;
 528         case CS6:
 529                 value |= 0x1;
 530                 break;
 531         case CS7:
 532                 value |= 0x2;
 533                 break;
 534         default:
 535         case CS8:
 536                 value |= 0x3;
 537                 break;
 538         }
 539
 540         value |= (t->c_cflag & CSTOPB) ? 0x4 : 0;
 541         if (t->c_cflag & PARENB) {
 542                 value |= 0x8;
 543                 value |= (t->c_cflag & PARODD) ? 0x0 : 0x10;
 544         }
 545         /*
 546          * XXX There doesn't seem to be a way to tell the device
 547          * to use flow control.
 548          */
 549
 550         sc->sc_lcr = value;
 551         umct_cfg_do_request(sc, UMCT_SET_LCR, UMCT_SET_LCR_SIZE, value);
 552 }
 553
 554 static void
 555 umct_start_read(struct ucom_softc *ucom)
 556 {
 557         struct umct_softc *sc = ucom->sc_parent;
 558
 559         /* start interrupt endpoint */
 560         usbd_transfer_start(sc->sc_xfer[UMCT_INTR_DT_RD]);
 561
 562         /* start read endpoint */
 563         usbd_transfer_start(sc->sc_xfer[UMCT_BULK_DT_RD]);
 564 }
 565
 566 static void
 567 umct_stop_read(struct ucom_softc *ucom)
 568 {
 569         struct umct_softc *sc = ucom->sc_parent;
 570
 571         /* stop interrupt endpoint */
 572         usbd_transfer_stop(sc->sc_xfer[UMCT_INTR_DT_RD]);
 573
 574         /* stop read endpoint */
 575         usbd_transfer_stop(sc->sc_xfer[UMCT_BULK_DT_RD]);
 576 }
 577
 578 static void
 579 umct_start_write(struct ucom_softc *ucom)
 580 {
 581         struct umct_softc *sc = ucom->sc_parent;
 582
 583         usbd_transfer_start(sc->sc_xfer[UMCT_BULK_DT_WR]);
 584 }
 585
 586 static void
 587 umct_stop_write(struct ucom_softc *ucom)
 588 {
 589         struct umct_softc *sc = ucom->sc_parent;
 590
 591         usbd_transfer_stop(sc->sc_xfer[UMCT_BULK_DT_WR]);
 592 }
 593
 594 static void
 595 umct_read_callback(struct usb_xfer *xfer, usb_error_t error)
 596 {
 597         struct umct_softc *sc = usbd_xfer_softc(xfer);
 598
 599         if (sc->sc_swap_cb)
 600                 umct_intr_callback_sub(xfer, error);
 601         else
 602                 umct_read_callback_sub(xfer, error);
 603 }
 604
 605 static void
 606 umct_intr_callback(struct usb_xfer *xfer, usb_error_t error)
 607 {
 608         struct umct_softc *sc = usbd_xfer_softc(xfer);
 609
 610         if (sc->sc_swap_cb)
 611                 umct_read_callback_sub(xfer, error);
 612         else
 613                 umct_intr_callback_sub(xfer, error);
 614 }
 615
 616 static void
 617 umct_write_callback(struct usb_xfer *xfer, usb_error_t error)
 618 {
 619         struct umct_softc *sc = usbd_xfer_softc(xfer);
 620         struct usb_page_cache *pc;
 621         uint32_t actlen;
 622
 623         switch (USB_GET_STATE(xfer)) {
 624         case USB_ST_SETUP:
 625         case USB_ST_TRANSFERRED:
 626 tr_setup:
 627                 pc = usbd_xfer_get_frame(xfer, 0);
 628                 if (ucom_get_data(&sc->sc_ucom, pc, 0,
 629                     sc->sc_obufsize, &actlen)) {
 630
 631                         usbd_xfer_set_frame_len(xfer, 0, actlen);
 632                         usbd_transfer_submit(xfer);
 633                 }
 634                 return;
 635
 636         default:                        /* Error */
 637                 if (error != USB_ERR_CANCELLED) {
 638                         /* try to clear stall first */
 639                         usbd_xfer_set_stall(xfer);
 640                         goto tr_setup;
 641                 }
 642                 return;
 643         }
 644 }
 645
 646 static void
 647 umct_read_callback_sub(struct usb_xfer *xfer, usb_error_t error)
 648 {
 649         struct umct_softc *sc = usbd_xfer_softc(xfer);
 650         struct usb_page_cache *pc;
 651         int actlen;
 652
 653         usbd_xfer_status(xfer, &actlen, NULL, NULL, NULL);
 654
 655         switch (USB_GET_STATE(xfer)) {
 656         case USB_ST_TRANSFERRED:
 657                 pc = usbd_xfer_get_frame(xfer, 0);
 658                 ucom_put_data(&sc->sc_ucom, pc, 0, actlen);
 659
 660         case USB_ST_SETUP:
 661 tr_setup:
 662                 usbd_xfer_set_frame_len(xfer, 0, usbd_xfer_max_len(xfer));
 663                 usbd_transfer_submit(xfer);
 664                 return;
 665
 666         default:                        /* Error */
 667                 if (error != USB_ERR_CANCELLED) {
 668                         /* try to clear stall first */
 669                         usbd_xfer_set_stall(xfer);
 670                         goto tr_setup;
 671                 }
 672                 return;
 673         }
 674 }
 675
 676 static void
 677 umct_poll(struct ucom_softc *ucom)
 678 {
 679         struct umct_softc *sc = ucom->sc_parent;
 680         usbd_transfer_poll(sc->sc_xfer, UMCT_N_TRANSFER);
 681 }