sys/dev/cmx/cmx.c

   1 /*-
   2  * Copyright (c) 2006-2007 Daniel Roethlisberger <daniel@roe.ch>
   3  * Copyright (c) 2000-2004 OMNIKEY GmbH (www.omnikey.com)
   4  * All rights reserved.
   5  *
   6  * Redistribution and use in source and binary forms, with or without
   7  * modification, are permitted provided that the following conditions
   8  * are met:
   9  * 1. Redistributions of source code must retain the above copyright
  10  *    notice unmodified, this list of conditions, and the following
  11  *    disclaimer.
  12  * 2. Redistributions in binary form must reproduce the above copyright
  13  *    notice, this list of conditions and the following disclaimer in the
  14  *    documentation and/or other materials provided with the distribution.
  15  *
  16  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
  17  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  18  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  19  * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
  20  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  21  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  22  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  23  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  24  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  25  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  26  * SUCH DAMAGE.
  27  */
  28
  29 #include <sys/cdefs.h>
  30 __FBSDID("$FreeBSD$");
  31
  32 /*
  33  * OMNIKEY CardMan 4040 a.k.a. CardMan eXtended (cmx) driver.
  34  * This is a PCMCIA based smartcard reader which seems to work
  35  * like an I/O port mapped USB CCID smartcard device.
  36  *
  37  * I/O originally based on Linux driver version 1.1.0 by OMNIKEY.
  38  * Dual GPL/BSD.  Almost all of the code has been rewritten.
  39  * $Omnikey: cm4040_cs.c,v 1.7 2004/10/04 09:08:50 jp Exp $
  40  */
  41
  42 #include <sys/param.h>
  43 #include <sys/systm.h>
  44 #include <sys/lock.h>
  45 #include <sys/kernel.h>
  46 #include <sys/mutex.h>
  47 #include <sys/sockio.h>
  48 #include <sys/mbuf.h>
  49 #include <sys/poll.h>
  50 #include <sys/conf.h>
  51 #include <sys/fcntl.h>
  52 #include <sys/uio.h>
  53 #include <sys/selinfo.h>
  54
  55 #include <sys/module.h>
  56 #include <sys/bus.h>
  57
  58 #include <machine/bus.h>
  59 #include <machine/resource.h>
  60 #include <sys/rman.h>
  61
  62 #include <dev/cmx/cmxvar.h>
  63 #include <dev/cmx/cmxreg.h>
  64
  65 #ifdef CMX_DEBUG
  66 #define DEBUG_printf(dev, fmt, args...) \
  67         device_printf(dev, "%s: " fmt, __FUNCTION__, ##args)
  68 #else
  69 #define DEBUG_printf(dev, fmt, args...)
  70 #endif
  71
  72 #define SPIN_COUNT                              1000
  73 #define WAIT_TICKS                              (hz/100)
  74 #define POLL_TICKS                              (hz/10)
  75
  76 /* possibly bogus */
  77 #define CCID_DRIVER_BULK_DEFAULT_TIMEOUT        (150*hz)
  78 #define CCID_DRIVER_ASYNC_POWERUP_TIMEOUT       (35*hz)
  79 #define CCID_DRIVER_MINIMUM_TIMEOUT             (3*hz)
  80
  81 #ifdef CMX_DEBUG
  82 static char     BSRBITS[] = "\020"
  83         "\01BULK_OUT_FULL"              /* 0x01 */
  84         "\02BULK_IN_FULL"               /* 0x02 */
  85         "\03(0x04)";                    /* 0x04 */
  86 #ifdef CMX_INTR
  87 static char     SCRBITS[] = "\020"
  88         "\01POWER_DOWN"                 /* 0x01 */
  89         "\02PULSE_INTERRUPT"            /* 0x02 */
  90         "\03HOST_TO_READER_DONE"        /* 0x04 */
  91         "\04READER_TO_HOST_DONE"        /* 0x08 */
  92         "\05ACK_NOTIFY"                 /* 0x10 */
  93         "\06EN_NOTIFY"                  /* 0x20 */
  94         "\07ABORT"                      /* 0x40 */
  95         "\10HOST_TO_READER_START";      /* 0x80 */
  96 #endif /* CMX_INTR */
  97 static char     POLLBITS[] = "\020"
  98         "\01POLLIN"                     /* 0x0001 */
  99         "\02POLLPRI"                    /* 0x0002 */
 100         "\03POLLOUT"                    /* 0x0004 */
 101         "\04POLLERR"                    /* 0x0008 */
 102         "\05POLLHUP"                    /* 0x0010 */
 103         "\06POLLINVAL"                  /* 0x0020 */
 104         "\07POLLRDNORM"                 /* 0x0040 */
 105         "\10POLLRDBAND"                 /* 0x0080 */
 106         "\11POLLWRBAND";                /* 0x0100 */
 107 static char     MODEBITS[] = "\020"
 108         "\01READ"                       /* 0x0001 */
 109         "\02WRITE"                      /* 0x0002 */
 110         "\03NONBLOCK"                   /* 0x0004 */
 111         "\04APPEND"                     /* 0x0008 */
 112         "\05SHLOCK"                     /* 0x0010 */
 113         "\06EXLOCK"                     /* 0x0020 */
 114         "\07ASYNC"                      /* 0x0040 */
 115         "\10FSYNC"                      /* 0x0080 */
 116         "\11NOFOLLOW"                   /* 0x0100 */
 117         "\12CREAT"                      /* 0x0200 */
 118         "\13TRUNK"                      /* 0x0400 */
 119         "\14EXCL"                       /* 0x0800 */
 120         "\15(0x1000)"                   /* 0x1000 */
 121         "\16(0x2000)"                   /* 0x2000 */
 122         "\17HASLOCK"                    /* 0x4000 */
 123         "\20NOCTTY"                     /* 0x8000 */
 124         "\21DIRECT";                    /* 0x00010000 */
 125 #endif /* CMX_DEBUG */
 126
 127 devclass_t cmx_devclass;
 128
 129 static d_open_t         cmx_open;
 130 static d_close_t        cmx_close;
 131 static d_read_t         cmx_read;
 132 static d_write_t        cmx_write;
 133 static d_poll_t         cmx_poll;
 134 #ifdef CMX_INTR
 135 static void             cmx_intr(void *arg);
 136 #endif
 137
 138 static struct cdevsw cmx_cdevsw = {
 139         .d_version =    D_VERSION,
 140         .d_open =       cmx_open,
 141         .d_close =      cmx_close,
 142         .d_read =       cmx_read,
 143         .d_write =      cmx_write,
 144         .d_poll =       cmx_poll,
 145         .d_name =       "cmx",
 146 };
 147
 148 /*
 149  * Initialize the softc structure.  Must be called from
 150  * the bus specific device allocation routine.
 151  */
 152 void
 153 cmx_init_softc(device_t dev)
 154 {
 155         struct cmx_softc *sc = device_get_softc(dev);
 156         sc->dev = dev;
 157         sc->timeout = CCID_DRIVER_MINIMUM_TIMEOUT;
 158 }
 159
 160 /*
 161  * Allocate driver resources.  Must be called from the
 162  * bus specific device allocation routine.  Caller must
 163  * ensure to call cmx_release_resources to free the
 164  * resources when detaching.
 165  * Return zero if successful, and ENOMEM if the resources
 166  * could not be allocated.
 167  */
 168 int
 169 cmx_alloc_resources(device_t dev)
 170 {
 171         struct cmx_softc *sc = device_get_softc(dev);
 172 #ifdef CMX_INTR
 173         int rv;
 174 #endif
 175
 176         sc->ioport = bus_alloc_resource_any(dev, SYS_RES_IOPORT,
 177                         &sc->ioport_rid, RF_ACTIVE);
 178         if (!sc->ioport) {
 179                 device_printf(dev, "failed to allocate io port\n");
 180                 return ENOMEM;
 181         }
 182         sc->bst = rman_get_bustag(sc->ioport);
 183         sc->bsh = rman_get_bushandle(sc->ioport);
 184
 185 #ifdef CMX_INTR
 186         sc->irq = bus_alloc_resource_any(dev, SYS_RES_IRQ,
 187                         &sc->irq_rid, RF_ACTIVE);
 188         if (!sc->irq) {
 189                 device_printf(dev, "failed to allocate irq\n");
 190                 return ENOMEM;
 191         }
 192         if ((rv = bus_setup_intr(dev, sc->irq, INTR_TYPE_TTY,
 193                         cmx_intr, sc, &sc->ih)) != 0) {
 194                 device_printf(dev, "failed to set up irq\n");
 195                 return ENOMEM;
 196         }
 197 #endif
 198
 199         mtx_init(&sc->mtx, device_get_nameunit(dev),
 200                         "cmx softc lock",
 201                         MTX_DEF | MTX_RECURSE);
 202         callout_init_mtx(&sc->ch, &sc->mtx, 0);
 203
 204         return 0;
 205 }
 206
 207 /*
 208  * Release the resources allocated by cmx_allocate_resources.
 209  */
 210 void
 211 cmx_release_resources(device_t dev)
 212 {
 213         struct cmx_softc *sc = device_get_softc(dev);
 214
 215         mtx_destroy(&sc->mtx);
 216
 217 #ifdef CMX_INTR
 218         if (sc->ih) {
 219                 bus_teardown_intr(dev, sc->irq, sc->ih);
 220                 sc->ih = NULL;
 221         }
 222         if (sc->irq) {
 223                 bus_release_resource(dev, SYS_RES_IRQ,
 224                                 sc->irq_rid, sc->irq);
 225                 sc->irq = NULL;
 226         }
 227 #endif
 228
 229         if (sc->ioport) {
 230                 bus_deactivate_resource(dev, SYS_RES_IOPORT,
 231                                 sc->ioport_rid, sc->ioport);
 232                 bus_release_resource(dev, SYS_RES_IOPORT,
 233                                 sc->ioport_rid, sc->ioport);
 234                 sc->ioport = NULL;
 235         }
 236         return;
 237 }
 238
 239 /*
 240  * Bus independent device attachment routine.  Creates the
 241  * character device node.
 242  */
 243 int
 244 cmx_attach(device_t dev)
 245 {
 246         struct cmx_softc *sc = device_get_softc(dev);
 247
 248         if (!sc || sc->dying)
 249                 return ENXIO;
 250
 251         sc->cdev = make_dev(&cmx_cdevsw, 0, UID_ROOT, GID_WHEEL, 0600,
 252                             "cmx%d", device_get_unit(dev));
 253         if (!sc->cdev) {
 254                 device_printf(dev, "failed to create character device\n");
 255                 return ENOMEM;
 256         }
 257         sc->cdev->si_drv1 = sc;
 258
 259         return 0;
 260 }
 261
 262 /*
 263  * Bus independent device detachment routine.  Makes sure all
 264  * allocated resources are freed, callouts disabled and waiting
 265  * processes unblocked.
 266  */
 267 int
 268 cmx_detach(device_t dev)
 269 {
 270         struct cmx_softc *sc = device_get_softc(dev);
 271
 272         DEBUG_printf(dev, "called\n");
 273
 274         sc->dying = 1;
 275
 276         CMX_LOCK(sc);
 277         if (sc->polling) {
 278                 DEBUG_printf(sc->dev, "disabling polling\n");
 279                 callout_stop(&sc->ch);
 280                 sc->polling = 0;
 281                 CMX_UNLOCK(sc);
 282                 callout_drain(&sc->ch);
 283                 selwakeuppri(&sc->sel, PZERO);
 284         } else {
 285                 CMX_UNLOCK(sc);
 286         }
 287
 288         wakeup(sc);
 289         destroy_dev(sc->cdev);
 290
 291         DEBUG_printf(dev, "releasing resources\n");
 292         cmx_release_resources(dev);
 293         return 0;
 294 }
 295
 296 /*
 297  * Wait for buffer status register events.  If test is non-zero,
 298  * wait until flags are set, otherwise wait until flags are unset.
 299  * Will spin SPIN_COUNT times, then sleep until timeout is reached.
 300  * Returns zero if event happened, EIO if the timeout was reached,
 301  * and ENXIO if the device was detached in the meantime.  When that
 302  * happens, the caller must quit immediately, since a detach is
 303  * in progress.
 304  */
 305 static inline int
 306 cmx_wait_BSR(struct cmx_softc *sc, uint8_t flags, int test)
 307 {
 308         int rv;
 309
 310         for (int i = 0; i < SPIN_COUNT; i++) {
 311                 if (cmx_test_BSR(sc, flags, test))
 312                         return 0;
 313         }
 314
 315         for (int i = 0; i * WAIT_TICKS < sc->timeout; i++) {
 316                 if (cmx_test_BSR(sc, flags, test))
 317                         return 0;
 318                 rv = tsleep(sc, PWAIT|PCATCH, "cmx", WAIT_TICKS);
 319                 /*
 320                  * Currently, the only reason for waking up with
 321                  * rv == 0 is when we are detaching, in which
 322                  * case sc->dying is always 1.
 323                  */
 324                 if (sc->dying)
 325                         return ENXIO;
 326                 if (rv != EAGAIN)
 327                         return rv;
 328         }
 329
 330         /* timeout */
 331         return EIO;
 332 }
 333
 334 /*
 335  * Set the sync control register to val.  Before and after writing
 336  * to the SCR, we wait for the BSR to not signal BULK_OUT_FULL.
 337  * Returns zero if successful, or whatever errors cmx_wait_BSR can
 338  * return.  ENXIO signals that the device has been detached in the
 339  * meantime, and that we should leave the kernel immediately.
 340  */
 341 static inline int
 342 cmx_sync_write_SCR(struct cmx_softc *sc, uint8_t val)
 343 {
 344         int rv = 0;
 345
 346         if ((rv = cmx_wait_BSR(sc, BSR_BULK_OUT_FULL, 0)) != 0) {
 347                 return rv;
 348         }
 349
 350         cmx_write_SCR(sc, val);
 351
 352         if ((rv = cmx_wait_BSR(sc, BSR_BULK_OUT_FULL, 0)) != 0) {
 353                 return rv;
 354         }
 355
 356         return 0;
 357 }
 358
 359 /*
 360  * Returns a suitable timeout value based on the given command byte.
 361  * Some commands appear to need longer timeout values than others.
 362  */
 363 static inline unsigned long
 364 cmx_timeout_by_cmd(uint8_t cmd)
 365 {
 366         switch (cmd) {
 367         case CMD_PC_TO_RDR_XFRBLOCK:
 368         case CMD_PC_TO_RDR_SECURE:
 369         case CMD_PC_TO_RDR_TEST_SECURE:
 370         case CMD_PC_TO_RDR_OK_SECURE:
 371                 return CCID_DRIVER_BULK_DEFAULT_TIMEOUT;
 372
 373         case CMD_PC_TO_RDR_ICCPOWERON:
 374                 return CCID_DRIVER_ASYNC_POWERUP_TIMEOUT;
 375
 376         case CMD_PC_TO_RDR_GETSLOTSTATUS:
 377         case CMD_PC_TO_RDR_ICCPOWEROFF:
 378         case CMD_PC_TO_RDR_GETPARAMETERS:
 379         case CMD_PC_TO_RDR_RESETPARAMETERS:
 380         case CMD_PC_TO_RDR_SETPARAMETERS:
 381         case CMD_PC_TO_RDR_ESCAPE:
 382         case CMD_PC_TO_RDR_ICCCLOCK:
 383         default:
 384                 return CCID_DRIVER_MINIMUM_TIMEOUT;
 385         }
 386 }
 387
 388 /*
 389  * Periodical callout routine, polling the reader for data
 390  * availability.  If the reader signals data ready for reading,
 391  * wakes up the processes which are waiting in select()/poll().
 392  * Otherwise, reschedules itself with a delay of POLL_TICKS.
 393  */
 394 static void
 395 cmx_tick(void *xsc)
 396 {
 397         struct cmx_softc *sc = xsc;
 398         uint8_t bsr;
 399
 400         CMX_LOCK(sc);
 401         if (sc->polling && !sc->dying) {
 402                 bsr = cmx_read_BSR(sc);
 403                 DEBUG_printf(sc->dev, "BSR=%b\n", bsr, BSRBITS);
 404                 if (cmx_test(bsr, BSR_BULK_IN_FULL, 1)) {
 405                         sc->polling = 0;
 406                         selwakeuppri(&sc->sel, PZERO);
 407                 } else {
 408                         callout_reset(&sc->ch, POLL_TICKS, cmx_tick, sc);
 409                 }
 410         }
 411         CMX_UNLOCK(sc);
 412 }
 413
 414 /*
 415  * Open the character device.  Only a single process may open the
 416  * device at a time.
 417  */
 418 static int
 419 cmx_open(struct cdev *cdev, int flags, int fmt, struct thread *td)
 420 {
 421         struct cmx_softc *sc = cdev->si_drv1;
 422
 423         if (sc == NULL || sc->dying)
 424                 return ENXIO;
 425
 426         CMX_LOCK(sc);
 427         if (sc->open) {
 428                 CMX_UNLOCK(sc);
 429                 return EBUSY;
 430         }
 431         sc->open = 1;
 432         CMX_UNLOCK(sc);
 433
 434         DEBUG_printf(sc->dev, "open (flags=%b thread=%p)\n",
 435                         flags, MODEBITS, td);
 436         return 0;
 437 }
 438
 439 /*
 440  * Close the character device.
 441  */
 442 static int
 443 cmx_close(struct cdev *cdev, int flags, int fmt, struct thread *td)
 444 {
 445         struct cmx_softc *sc = cdev->si_drv1;
 446
 447         if (sc == NULL || sc->dying)
 448                 return ENXIO;
 449
 450         CMX_LOCK(sc);
 451         if (!sc->open) {
 452                 CMX_UNLOCK(sc);
 453                 return EINVAL;
 454         }
 455         if (sc->polling) {
 456                 DEBUG_printf(sc->dev, "disabling polling\n");
 457                 callout_stop(&sc->ch);
 458                 sc->polling = 0;
 459                 CMX_UNLOCK(sc);
 460                 callout_drain(&sc->ch);
 461                 selwakeuppri(&sc->sel, PZERO);
 462                 CMX_LOCK(sc);
 463         }
 464         sc->open = 0;
 465         CMX_UNLOCK(sc);
 466
 467         DEBUG_printf(sc->dev, "close (flags=%b thread=%p)\n",
 468                         flags, MODEBITS, td);
 469         return 0;
 470 }
 471
 472 /*
 473  * Read from the character device.
 474  * Returns zero if successful, ENXIO if dying, EINVAL if an attempt
 475  * was made to read less than CMX_MIN_RDLEN bytes or less than the
 476  * device has available, or any of the errors that cmx_sync_write_SCR
 477  * can return.  Partial reads are not supported.
 478  */
 479 static int
 480 cmx_read(struct cdev *cdev, struct uio *uio, int flag)
 481 {
 482         struct cmx_softc *sc = cdev->si_drv1;
 483         unsigned long bytes_left;
 484         uint8_t uc;
 485         int rv, amnt, offset;
 486
 487         if (sc == NULL || sc->dying)
 488                 return ENXIO;
 489
 490         DEBUG_printf(sc->dev, "called (len=%d flag=%b)\n",
 491                 uio->uio_resid, flag, MODEBITS);
 492
 493         CMX_LOCK(sc);
 494         if (sc->polling) {
 495                 DEBUG_printf(sc->dev, "disabling polling\n");
 496                 callout_stop(&sc->ch);
 497                 sc->polling = 0;
 498                 CMX_UNLOCK(sc);
 499                 callout_drain(&sc->ch);
 500                 selwakeuppri(&sc->sel, PZERO);
 501         } else {
 502                 CMX_UNLOCK(sc);
 503         }
 504
 505         if (uio->uio_resid == 0) {
 506                 return 0;
 507         }
 508
 509         if (uio->uio_resid < CMX_MIN_RDLEN) {
 510                 return EINVAL;
 511         }
 512
 513         if (flag & O_NONBLOCK) {
 514                 if (cmx_test_BSR(sc, BSR_BULK_IN_FULL, 0)) {
 515                         return EAGAIN;
 516                 }
 517         }
 518
 519         for (int i = 0; i < 5; i++) {
 520                 if ((rv = cmx_wait_BSR(sc, BSR_BULK_IN_FULL, 1)) != 0) {
 521                         return rv;
 522                 }
 523                 sc->buf[i] = cmx_read_DTR(sc);
 524                 DEBUG_printf(sc->dev, "buf[%02x]=%02x\n", i, sc->buf[i]);
 525         }
 526
 527         bytes_left = CMX_MIN_RDLEN +
 528                         (0x000000FF&((char)sc->buf[1])) +
 529                         (0x0000FF00&((char)sc->buf[2] << 8)) +
 530                         (0x00FF0000&((char)sc->buf[3] << 16)) +
 531                         (0xFF000000&((char)sc->buf[4] << 24));
 532         DEBUG_printf(sc->dev, "msgsz=%lu\n", bytes_left);
 533
 534         if (uio->uio_resid < bytes_left) {
 535                 return EINVAL;
 536         }
 537
 538         offset = 5; /* prefetched header */
 539         while (bytes_left > 0) {
 540                 amnt = MIN(bytes_left, sizeof(sc->buf));
 541
 542                 for (int i = offset; i < amnt; i++) {
 543                         if ((rv = cmx_wait_BSR(sc, BSR_BULK_IN_FULL, 1))!=0) {
 544                                 return rv;
 545                         }
 546                         sc->buf[i] = cmx_read_DTR(sc);
 547                         DEBUG_printf(sc->dev, "buf[%02x]=%02x\n",
 548                                         i, sc->buf[i]);
 549                 }
 550
 551                 if ((rv = uiomove(sc->buf, amnt, uio)) != 0) {
 552                         DEBUG_printf(sc->dev, "uiomove failed (%d)\n", rv);
 553                         return rv;
 554                 }
 555
 556                 if (offset)
 557                         offset = 0;
 558                 bytes_left -= amnt;
 559         }
 560
 561         if ((rv = cmx_wait_BSR(sc, BSR_BULK_IN_FULL, 1)) != 0) {
 562                 return rv;
 563         }
 564
 565         if ((rv = cmx_sync_write_SCR(sc, SCR_READER_TO_HOST_DONE)) != 0) {
 566                 return rv;
 567         }
 568
 569         uc = cmx_read_DTR(sc);
 570         DEBUG_printf(sc->dev, "success (DTR=%02x)\n", uc);
 571         return 0;
 572 }
 573
 574 /*
 575  * Write to the character device.
 576  * Returns zero if successful, NXIO if dying, EINVAL if less data
 577  * written than CMX_MIN_WRLEN, or any of the errors that cmx_sync_SCR
 578  * can return.
 579  */
 580 static int
 581 cmx_write(struct cdev *cdev, struct uio *uio, int flag)
 582 {
 583         struct cmx_softc *sc = cdev->si_drv1;
 584         int rv, amnt;
 585
 586         if (sc == NULL || sc->dying)
 587                 return ENXIO;
 588
 589         DEBUG_printf(sc->dev, "called (len=%d flag=%b)\n",
 590                         uio->uio_resid, flag, MODEBITS);
 591
 592         if (uio->uio_resid == 0) {
 593                 return 0;
 594         }
 595
 596         if (uio->uio_resid < CMX_MIN_WRLEN) {
 597                 return EINVAL;
 598         }
 599
 600         if ((rv = cmx_sync_write_SCR(sc, SCR_HOST_TO_READER_START)) != 0) {
 601                 return rv;
 602         }
 603
 604         sc->timeout = 0;
 605         while (uio->uio_resid > 0) {
 606                 amnt = MIN(uio->uio_resid, sizeof(sc->buf));
 607
 608                 if ((rv = uiomove(sc->buf, amnt, uio)) != 0) {
 609                         DEBUG_printf(sc->dev, "uiomove failed (%d)\n", rv);
 610                         /* wildly guessed attempt to notify device */
 611                         sc->timeout = CCID_DRIVER_MINIMUM_TIMEOUT;
 612                         cmx_sync_write_SCR(sc, SCR_HOST_TO_READER_DONE);
 613                         return rv;
 614                 }
 615
 616                 if (sc->timeout == 0) {
 617                         sc->timeout = cmx_timeout_by_cmd(sc->buf[0]);
 618                         DEBUG_printf(sc->dev, "cmd=%02x timeout=%lu\n",
 619                                         sc->buf[0], sc->timeout);
 620                 }
 621
 622                 for (int i = 0; i < amnt; i++) {
 623                         if ((rv = cmx_wait_BSR(sc, BSR_BULK_OUT_FULL, 0))!=0) {
 624                                 return rv;
 625                         }
 626                         cmx_write_DTR(sc, sc->buf[i]);
 627                         DEBUG_printf(sc->dev, "buf[%02x]=%02x\n",
 628                                         i, sc->buf[i]);
 629                 }
 630         }
 631
 632         if ((rv = cmx_sync_write_SCR(sc, SCR_HOST_TO_READER_DONE)) != 0) {
 633                 return rv;
 634         }
 635
 636         DEBUG_printf(sc->dev, "success\n");
 637         return 0;
 638 }
 639
 640 /*
 641  * Poll handler.  Writing is always possible, reading is only possible
 642  * if BSR_BULK_IN_FULL is set.  Will start the cmx_tick callout and
 643  * set sc->polling.
 644  */
 645 static int
 646 cmx_poll(struct cdev *cdev, int events, struct thread *td)
 647 {
 648         struct cmx_softc *sc = cdev->si_drv1;
 649         int revents = 0;
 650         uint8_t bsr = 0;
 651
 652         if (sc == NULL || sc->dying)
 653                 return ENXIO;
 654
 655         bsr = cmx_read_BSR(sc);
 656         DEBUG_printf(sc->dev, "called (events=%b BSR=%b)\n",
 657                         events, POLLBITS, bsr, BSRBITS);
 658
 659         revents = events & (POLLOUT | POLLWRNORM);
 660         if (events & (POLLIN | POLLRDNORM)) {
 661                 if (cmx_test(bsr, BSR_BULK_IN_FULL, 1)) {
 662                         revents |= events & (POLLIN | POLLRDNORM);
 663                 } else {
 664                         selrecord(td, &sc->sel);
 665                         CMX_LOCK(sc);
 666                         if (!sc->polling) {
 667                                 DEBUG_printf(sc->dev, "enabling polling\n");
 668                                 sc->polling = 1;
 669                                 callout_reset(&sc->ch, POLL_TICKS,
 670                                                 cmx_tick, sc);
 671                         } else {
 672                                 DEBUG_printf(sc->dev, "already polling\n");
 673                         }
 674                         CMX_UNLOCK(sc);
 675                 }
 676         }
 677
 678         DEBUG_printf(sc->dev, "success (revents=%b)\n", revents, POLLBITS);
 679
 680         return revents;
 681 }
 682
 683 #ifdef CMX_INTR
 684 /*
 685  * Interrupt handler.  Currently has no function except to
 686  * print register status (if debugging is also enabled).
 687  */
 688 static void
 689 cmx_intr(void *arg)
 690 {
 691         struct cmx_softc *sc = (struct cmx_softc *)arg;
 692
 693         if (sc == NULL || sc->dying)
 694                 return;
 695
 696         DEBUG_printf(sc->dev, "received interrupt (SCR=%b BSR=%b)\n",
 697                         cmx_read_SCR(sc), SCRBITS,
 698                         cmx_read_BSR(sc), BSRBITS);
 699
 700         return;
 701 }
 702 #endif
 703