sys/dev/misc/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  * $FreeBSD: src/sys/dev/cmx/cmx.c,v 1.1 2008/03/06 08:09:45 rink Exp $
  29  * $DragonFly: src/sys/dev/misc/cmx/cmx.c,v 1.2 2008/08/08 18:33:11 hasso Exp $
  30  */
  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 #include <sys/types.h>
  53 #include <sys/lock.h>
  54 #include <sys/device.h>
  55 #include <sys/thread2.h>
  56
  57 #include <sys/module.h>
  58 #include <sys/bus.h>
  59 #include <sys/resource.h>
  60 #include <sys/rman.h>
  61
  62 #include "cmxvar.h"
  63 #include "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 #define CDEV_MAJOR      185
 139 static struct dev_ops cmx_ops = {
 140         { "cmx", CDEV_MAJOR, 0 },
 141         .d_open =       cmx_open,
 142         .d_close =      cmx_close,
 143         .d_read =       cmx_read,
 144         .d_write =      cmx_write,
 145         .d_poll =       cmx_poll,
 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, 0, cmx_intr, sc,
 193                         &sc->ih, NULL)) != 0) {
 194                 device_printf(dev, "failed to set up irq\n");
 195                 return ENOMEM;
 196         }
 197 #endif
 198
 199         lockinit(&sc->mtx, "cmx softc lock", 0, LK_CANRECURSE);
 200         callout_init(&sc->ch);
 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         lockuninit(&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_ops, 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                 selwakeup(&sc->sel);
 281         } else {
 282                 CMX_UNLOCK(sc);
 283         }
 284
 285         wakeup(sc);
 286         DEBUG_printf(dev, "releasing resources\n");
 287         cmx_release_resources(dev);
 288         dev_ops_remove_minor(&cmx_ops, device_get_unit(dev));
 289
 290         return 0;
 291 }
 292
 293 /*
 294  * Wait for buffer status register events.  If test is non-zero,
 295  * wait until flags are set, otherwise wait until flags are unset.
 296  * Will spin SPIN_COUNT times, then sleep until timeout is reached.
 297  * Returns zero if event happened, EIO if the timeout was reached,
 298  * and ENXIO if the device was detached in the meantime.  When that
 299  * happens, the caller must quit immediately, since a detach is
 300  * in progress.
 301  */
 302 static inline int
 303 cmx_wait_BSR(struct cmx_softc *sc, uint8_t flags, int test)
 304 {
 305         int rv;
 306
 307         for (int i = 0; i < SPIN_COUNT; i++) {
 308                 if (cmx_test_BSR(sc, flags, test))
 309                         return 0;
 310         }
 311
 312         for (int i = 0; i * WAIT_TICKS < sc->timeout; i++) {
 313                 if (cmx_test_BSR(sc, flags, test))
 314                         return 0;
 315                 rv = tsleep(sc, PCATCH, "cmx", WAIT_TICKS);
 316                 /*
 317                  * Currently, the only reason for waking up with
 318                  * rv == 0 is when we are detaching, in which
 319                  * case sc->dying is always 1.
 320                  */
 321                 if (sc->dying)
 322                         return ENXIO;
 323                 if (rv != EAGAIN)
 324                         return rv;
 325         }
 326
 327         /* timeout */
 328         return EIO;
 329 }
 330
 331 /*
 332  * Set the sync control register to val.  Before and after writing
 333  * to the SCR, we wait for the BSR to not signal BULK_OUT_FULL.
 334  * Returns zero if successful, or whatever errors cmx_wait_BSR can
 335  * return.  ENXIO signals that the device has been detached in the
 336  * meantime, and that we should leave the kernel immediately.
 337  */
 338 static inline int
 339 cmx_sync_write_SCR(struct cmx_softc *sc, uint8_t val)
 340 {
 341         int rv = 0;
 342
 343         if ((rv = cmx_wait_BSR(sc, BSR_BULK_OUT_FULL, 0)) != 0) {
 344                 return rv;
 345         }
 346
 347         cmx_write_SCR(sc, val);
 348
 349         if ((rv = cmx_wait_BSR(sc, BSR_BULK_OUT_FULL, 0)) != 0) {
 350                 return rv;
 351         }
 352
 353         return 0;
 354 }
 355
 356 /*
 357  * Returns a suitable timeout value based on the given command byte.
 358  * Some commands appear to need longer timeout values than others.
 359  */
 360 static inline unsigned long
 361 cmx_timeout_by_cmd(uint8_t cmd)
 362 {
 363         switch (cmd) {
 364         case CMD_PC_TO_RDR_XFRBLOCK:
 365         case CMD_PC_TO_RDR_SECURE:
 366         case CMD_PC_TO_RDR_TEST_SECURE:
 367         case CMD_PC_TO_RDR_OK_SECURE:
 368                 return CCID_DRIVER_BULK_DEFAULT_TIMEOUT;
 369
 370         case CMD_PC_TO_RDR_ICCPOWERON:
 371                 return CCID_DRIVER_ASYNC_POWERUP_TIMEOUT;
 372
 373         case CMD_PC_TO_RDR_GETSLOTSTATUS:
 374         case CMD_PC_TO_RDR_ICCPOWEROFF:
 375         case CMD_PC_TO_RDR_GETPARAMETERS:
 376         case CMD_PC_TO_RDR_RESETPARAMETERS:
 377         case CMD_PC_TO_RDR_SETPARAMETERS:
 378         case CMD_PC_TO_RDR_ESCAPE:
 379         case CMD_PC_TO_RDR_ICCCLOCK:
 380         default:
 381                 return CCID_DRIVER_MINIMUM_TIMEOUT;
 382         }
 383 }
 384
 385 /*
 386  * Periodical callout routine, polling the reader for data
 387  * availability.  If the reader signals data ready for reading,
 388  * wakes up the processes which are waiting in select()/poll().
 389  * Otherwise, reschedules itself with a delay of POLL_TICKS.
 390  */
 391 static void
 392 cmx_tick(void *xsc)
 393 {
 394         struct cmx_softc *sc = xsc;
 395         uint8_t bsr;
 396
 397         CMX_LOCK(sc);
 398         if (sc->polling && !sc->dying) {
 399                 bsr = cmx_read_BSR(sc);
 400                 DEBUG_printf(sc->dev, "BSR=%b\n", bsr, BSRBITS);
 401                 if (cmx_test(bsr, BSR_BULK_IN_FULL, 1)) {
 402                         sc->polling = 0;
 403                         selwakeup(&sc->sel);
 404                 } else {
 405                         callout_reset(&sc->ch, POLL_TICKS, cmx_tick, sc);
 406                 }
 407         }
 408         CMX_UNLOCK(sc);
 409 }
 410
 411 /*
 412  * Open the character device.  Only a single process may open the
 413  * device at a time.
 414  */
 415 static int
 416 cmx_open(struct dev_open_args *ap)
 417 {
 418         cdev_t dev = ap->a_head.a_dev;
 419         struct cmx_softc *sc;
 420
 421         sc = devclass_get_softc(cmx_devclass, minor(dev));
 422         if (sc == NULL || sc->dying)
 423                 return ENXIO;
 424
 425         CMX_LOCK(sc);
 426         if (sc->open) {
 427                 CMX_UNLOCK(sc);
 428                 return EBUSY;
 429         }
 430         sc->open = 1;
 431         CMX_UNLOCK(sc);
 432
 433         DEBUG_printf(sc->dev, "open (flags=%b thread=%p)\n",
 434                         ap->a_oflags, MODEBITS, curthread);
 435         return 0;
 436 }
 437
 438 /*
 439  * Close the character device.
 440  */
 441 static int
 442 cmx_close(struct dev_close_args *ap)
 443 {
 444         cdev_t dev = ap->a_head.a_dev;
 445         struct cmx_softc *sc;
 446
 447         sc = devclass_get_softc(cmx_devclass, minor(dev));
 448         if (sc == NULL || sc->dying)
 449                 return ENXIO;
 450
 451         CMX_LOCK(sc);
 452         if (!sc->open) {
 453                 CMX_UNLOCK(sc);
 454                 return EINVAL;
 455         }
 456         if (sc->polling) {
 457                 DEBUG_printf(sc->dev, "disabling polling\n");
 458                 callout_stop(&sc->ch);
 459                 sc->polling = 0;
 460                 CMX_UNLOCK(sc);
 461                 selwakeup(&sc->sel);
 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                         ap->a_fflag, MODEBITS, curthread);
 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 dev_read_args *ap)
 481 {
 482         cdev_t dev = ap->a_head.a_dev;
 483         struct cmx_softc *sc;
 484         struct uio *uio = ap->a_uio;
 485         unsigned long bytes_left;
 486         uint8_t uc;
 487         int rv, amnt, offset;
 488
 489         sc = devclass_get_softc(cmx_devclass, minor(dev));
 490         if (sc == NULL || sc->dying)
 491                 return ENXIO;
 492
 493         DEBUG_printf(sc->dev, "called (len=%d flag=%b)\n",
 494                 uio->uio_resid, ap->a_ioflag, MODEBITS);
 495
 496         CMX_LOCK(sc);
 497         if (sc->polling) {
 498                 DEBUG_printf(sc->dev, "disabling polling\n");
 499                 callout_stop(&sc->ch);
 500                 sc->polling = 0;
 501                 CMX_UNLOCK(sc);
 502                 selwakeup(&sc->sel);
 503         } else {
 504                 CMX_UNLOCK(sc);
 505         }
 506
 507         if (uio->uio_resid == 0) {
 508                 return 0;
 509         }
 510
 511         if (uio->uio_resid < CMX_MIN_RDLEN) {
 512                 return EINVAL;
 513         }
 514
 515         if (ap->a_ioflag & O_NONBLOCK) {
 516                 if (cmx_test_BSR(sc, BSR_BULK_IN_FULL, 0)) {
 517                         return EAGAIN;
 518                 }
 519         }
 520
 521         for (int i = 0; i < 5; i++) {
 522                 if ((rv = cmx_wait_BSR(sc, BSR_BULK_IN_FULL, 1)) != 0) {
 523                         return rv;
 524                 }
 525                 sc->buf[i] = cmx_read_DTR(sc);
 526                 DEBUG_printf(sc->dev, "buf[%02x]=%02x\n", i, sc->buf[i]);
 527         }
 528
 529         bytes_left = CMX_MIN_RDLEN +
 530                         (0x000000FF&((char)sc->buf[1])) +
 531                         (0x0000FF00&((char)sc->buf[2] << 8)) +
 532                         (0x00FF0000&((char)sc->buf[3] << 16)) +
 533                         (0xFF000000&((char)sc->buf[4] << 24));
 534         DEBUG_printf(sc->dev, "msgsz=%lu\n", bytes_left);
 535
 536         if (uio->uio_resid < bytes_left) {
 537                 return EINVAL;
 538         }
 539
 540         offset = 5; /* prefetched header */
 541         while (bytes_left > 0) {
 542                 amnt = MIN(bytes_left, sizeof(sc->buf));
 543
 544                 for (int i = offset; i < amnt; i++) {
 545                         if ((rv = cmx_wait_BSR(sc, BSR_BULK_IN_FULL, 1))!=0) {
 546                                 return rv;
 547                         }
 548                         sc->buf[i] = cmx_read_DTR(sc);
 549                         DEBUG_printf(sc->dev, "buf[%02x]=%02x\n",
 550                                         i, sc->buf[i]);
 551                 }
 552
 553                 if ((rv = uiomove(sc->buf, amnt, uio)) != 0) {
 554                         DEBUG_printf(sc->dev, "uiomove failed (%d)\n", rv);
 555                         return rv;
 556                 }
 557
 558                 if (offset)
 559                         offset = 0;
 560                 bytes_left -= amnt;
 561         }
 562
 563         if ((rv = cmx_wait_BSR(sc, BSR_BULK_IN_FULL, 1)) != 0) {
 564                 return rv;
 565         }
 566
 567         if ((rv = cmx_sync_write_SCR(sc, SCR_READER_TO_HOST_DONE)) != 0) {
 568                 return rv;
 569         }
 570
 571         uc = cmx_read_DTR(sc);
 572         DEBUG_printf(sc->dev, "success (DTR=%02x)\n", uc);
 573         return 0;
 574 }
 575
 576 /*
 577  * Write to the character device.
 578  * Returns zero if successful, NXIO if dying, EINVAL if less data
 579  * written than CMX_MIN_WRLEN, or any of the errors that cmx_sync_SCR
 580  * can return.
 581  */
 582 static int
 583 cmx_write(struct dev_write_args *ap)
 584 {
 585         cdev_t dev = ap->a_head.a_dev;
 586         struct cmx_softc *sc;
 587         struct uio *uio = ap->a_uio;
 588         int rv, amnt;
 589
 590         sc = devclass_get_softc(cmx_devclass, minor(dev));
 591         if (sc == NULL || sc->dying)
 592                 return ENXIO;
 593
 594         DEBUG_printf(sc->dev, "called (len=%d flag=%b)\n",
 595                         uio->uio_resid, ap->a_ioflag, MODEBITS);
 596
 597         if (uio->uio_resid == 0) {
 598                 return 0;
 599         }
 600
 601         if (uio->uio_resid < CMX_MIN_WRLEN) {
 602                 return EINVAL;
 603         }
 604
 605         if ((rv = cmx_sync_write_SCR(sc, SCR_HOST_TO_READER_START)) != 0) {
 606                 return rv;
 607         }
 608
 609         sc->timeout = 0;
 610         while (uio->uio_resid > 0) {
 611                 amnt = MIN(uio->uio_resid, sizeof(sc->buf));
 612
 613                 if ((rv = uiomove(sc->buf, amnt, uio)) != 0) {
 614                         DEBUG_printf(sc->dev, "uiomove failed (%d)\n", rv);
 615                         /* wildly guessed attempt to notify device */
 616                         sc->timeout = CCID_DRIVER_MINIMUM_TIMEOUT;
 617                         cmx_sync_write_SCR(sc, SCR_HOST_TO_READER_DONE);
 618                         return rv;
 619                 }
 620
 621                 if (sc->timeout == 0) {
 622                         sc->timeout = cmx_timeout_by_cmd(sc->buf[0]);
 623                         DEBUG_printf(sc->dev, "cmd=%02x timeout=%lu\n",
 624                                         sc->buf[0], sc->timeout);
 625                 }
 626
 627                 for (int i = 0; i < amnt; i++) {
 628                         if ((rv = cmx_wait_BSR(sc, BSR_BULK_OUT_FULL, 0))!=0) {
 629                                 return rv;
 630                         }
 631                         cmx_write_DTR(sc, sc->buf[i]);
 632                         DEBUG_printf(sc->dev, "buf[%02x]=%02x\n",
 633                                         i, sc->buf[i]);
 634                 }
 635         }
 636
 637         if ((rv = cmx_sync_write_SCR(sc, SCR_HOST_TO_READER_DONE)) != 0) {
 638                 return rv;
 639         }
 640
 641         DEBUG_printf(sc->dev, "success\n");
 642         return 0;
 643 }
 644
 645 /*
 646  * Poll handler.  Writing is always possible, reading is only possible
 647  * if BSR_BULK_IN_FULL is set.  Will start the cmx_tick callout and
 648  * set sc->polling.
 649  */
 650 static int
 651 cmx_poll(struct dev_poll_args *ap)
 652 {
 653         cdev_t dev = ap->a_head.a_dev;
 654         struct cmx_softc *sc;
 655         int revents = 0;
 656         uint8_t bsr = 0;
 657
 658         sc = devclass_get_softc(cmx_devclass, minor(dev));
 659         if (sc == NULL || sc->dying)
 660                 return ENXIO;
 661
 662         bsr = cmx_read_BSR(sc);
 663         DEBUG_printf(sc->dev, "called (events=%b BSR=%b)\n",
 664                         ap->a_events, POLLBITS, bsr, BSRBITS);
 665
 666         revents = ap->a_events & (POLLOUT | POLLWRNORM);
 667         if (ap->a_events & (POLLIN | POLLRDNORM)) {
 668                 if (cmx_test(bsr, BSR_BULK_IN_FULL, 1)) {
 669                         revents |= ap->a_events & (POLLIN | POLLRDNORM);
 670                 } else {
 671                         selrecord(curthread, &sc->sel);
 672                         CMX_LOCK(sc);
 673                         if (!sc->polling) {
 674                                 DEBUG_printf(sc->dev, "enabling polling\n");
 675                                 sc->polling = 1;
 676                                 callout_reset(&sc->ch, POLL_TICKS,
 677                                                 cmx_tick, sc);
 678                         } else {
 679                                 DEBUG_printf(sc->dev, "already polling\n");
 680                         }
 681                         CMX_UNLOCK(sc);
 682                 }
 683         }
 684
 685         DEBUG_printf(sc->dev, "success (revents=%b)\n", revents, POLLBITS);
 686
 687         return revents;
 688 }
 689
 690 #ifdef CMX_INTR
 691 /*
 692  * Interrupt handler.  Currently has no function except to
 693  * print register status (if debugging is also enabled).
 694  */
 695 static void
 696 cmx_intr(void *arg)
 697 {
 698         struct cmx_softc *sc = (struct cmx_softc *)arg;
 699
 700         if (sc == NULL || sc->dying)
 701                 return;
 702
 703         DEBUG_printf(sc->dev, "received interrupt (SCR=%b BSR=%b)\n",
 704                         cmx_read_SCR(sc), SCRBITS,
 705                         cmx_read_BSR(sc), BSRBITS);
 706
 707         return;
 708 }
 709 #endif
 710