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