drivers/char/pcmcia/cm4040_cs.c

   1 /*
   2  * A driver for the Omnikey PCMCIA smartcard reader CardMan 4040
   3  *
   4  * (c) 2000-2004 Omnikey AG (http://www.omnikey.com/)
   5  *
   6  * (C) 2005-2006 Harald Welte <laforge@gnumonks.org>
   7  *      - add support for poll()
   8  *      - driver cleanup
   9  *      - add waitqueues
  10  *      - adhere to linux kernel coding style and policies
  11  *      - support 2.6.13 "new style" pcmcia interface
  12  *      - add class interface for udev device creation
  13  *
  14  * The device basically is a USB CCID compliant device that has been
  15  * attached to an I/O-Mapped FIFO.
  16  *
  17  * All rights reserved, Dual BSD/GPL Licensed.
  18  */
  19
  20 #include <linux/kernel.h>
  21 #include <linux/module.h>
  22 #include <linux/slab.h>
  23 #include <linux/init.h>
  24 #include <linux/fs.h>
  25 #include <linux/delay.h>
  26 #include <linux/poll.h>
  27 #include <linux/mutex.h>
  28 #include <linux/wait.h>
  29 #include <asm/uaccess.h>
  30 #include <asm/io.h>
  31
  32 #include <pcmcia/cs.h>
  33 #include <pcmcia/cistpl.h>
  34 #include <pcmcia/cisreg.h>
  35 #include <pcmcia/ciscode.h>
  36 #include <pcmcia/ds.h>
  37
  38 #include "cm4040_cs.h"
  39
  40
  41 #define reader_to_dev(x)        (&x->p_dev->dev)
  42
  43 /* n (debug level) is ignored */
  44 /* additional debug output may be enabled by re-compiling with
  45  * CM4040_DEBUG set */
  46 /* #define CM4040_DEBUG */
  47 #define DEBUGP(n, rdr, x, args...) do {                 \
  48                 dev_dbg(reader_to_dev(rdr), "%s:" x,    \
  49                            __func__ , ## args);         \
  50         } while (0)
  51
  52 static DEFINE_MUTEX(cm4040_mutex);
  53 static char *version =
  54 "OMNIKEY CardMan 4040 v1.1.0gm5 - All bugs added by Harald Welte";
  55
  56 #define CCID_DRIVER_BULK_DEFAULT_TIMEOUT        (150*HZ)
  57 #define CCID_DRIVER_ASYNC_POWERUP_TIMEOUT       (35*HZ)
  58 #define CCID_DRIVER_MINIMUM_TIMEOUT             (3*HZ)
  59 #define READ_WRITE_BUFFER_SIZE 512
  60 #define POLL_LOOP_COUNT                         1000
  61
  62 /* how often to poll for fifo status change */
  63 #define POLL_PERIOD                             msecs_to_jiffies(10)
  64
  65 static void reader_release(struct pcmcia_device *link);
  66
  67 static int major;
  68 static struct class *cmx_class;
  69
  70 #define         BS_READABLE     0x01
  71 #define         BS_WRITABLE     0x02
  72
  73 struct reader_dev {
  74         struct pcmcia_device    *p_dev;
  75         wait_queue_head_t       devq;
  76         wait_queue_head_t       poll_wait;
  77         wait_queue_head_t       read_wait;
  78         wait_queue_head_t       write_wait;
  79         unsigned long           buffer_status;
  80         unsigned long           timeout;
  81         unsigned char           s_buf[READ_WRITE_BUFFER_SIZE];
  82         unsigned char           r_buf[READ_WRITE_BUFFER_SIZE];
  83         struct timer_list       poll_timer;
  84 };
  85
  86 static struct pcmcia_device *dev_table[CM_MAX_DEV];
  87
  88 #ifndef CM4040_DEBUG
  89 #define xoutb   outb
  90 #define xinb    inb
  91 #else
  92 static inline void xoutb(unsigned char val, unsigned short port)
  93 {
  94         pr_debug("outb(val=%.2x,port=%.4x)\n", val, port);
  95         outb(val, port);
  96 }
  97
  98 static inline unsigned char xinb(unsigned short port)
  99 {
 100         unsigned char val;
 101
 102         val = inb(port);
 103         pr_debug("%.2x=inb(%.4x)\n", val, port);
 104         return val;
 105 }
 106 #endif
 107
 108 /* poll the device fifo status register.  not to be confused with
 109  * the poll syscall. */
 110 static void cm4040_do_poll(unsigned long dummy)
 111 {
 112         struct reader_dev *dev = (struct reader_dev *) dummy;
 113         unsigned int obs = xinb(dev->p_dev->resource[0]->start
 114                                 + REG_OFFSET_BUFFER_STATUS);
 115
 116         if ((obs & BSR_BULK_IN_FULL)) {
 117                 set_bit(BS_READABLE, &dev->buffer_status);
 118                 DEBUGP(4, dev, "waking up read_wait\n");
 119                 wake_up_interruptible(&dev->read_wait);
 120         } else
 121                 clear_bit(BS_READABLE, &dev->buffer_status);
 122
 123         if (!(obs & BSR_BULK_OUT_FULL)) {
 124                 set_bit(BS_WRITABLE, &dev->buffer_status);
 125                 DEBUGP(4, dev, "waking up write_wait\n");
 126                 wake_up_interruptible(&dev->write_wait);
 127         } else
 128                 clear_bit(BS_WRITABLE, &dev->buffer_status);
 129
 130         if (dev->buffer_status)
 131                 wake_up_interruptible(&dev->poll_wait);
 132
 133         mod_timer(&dev->poll_timer, jiffies + POLL_PERIOD);
 134 }
 135
 136 static void cm4040_stop_poll(struct reader_dev *dev)
 137 {
 138         del_timer_sync(&dev->poll_timer);
 139 }
 140
 141 static int wait_for_bulk_out_ready(struct reader_dev *dev)
 142 {
 143         int i, rc;
 144         int iobase = dev->p_dev->resource[0]->start;
 145
 146         for (i = 0; i < POLL_LOOP_COUNT; i++) {
 147                 if ((xinb(iobase + REG_OFFSET_BUFFER_STATUS)
 148                     & BSR_BULK_OUT_FULL) == 0) {
 149                         DEBUGP(4, dev, "BulkOut empty (i=%d)\n", i);
 150                         return 1;
 151                 }
 152         }
 153
 154         DEBUGP(4, dev, "wait_event_interruptible_timeout(timeout=%ld\n",
 155                 dev->timeout);
 156         rc = wait_event_interruptible_timeout(dev->write_wait,
 157                                               test_and_clear_bit(BS_WRITABLE,
 158                                                        &dev->buffer_status),
 159                                               dev->timeout);
 160
 161         if (rc > 0)
 162                 DEBUGP(4, dev, "woke up: BulkOut empty\n");
 163         else if (rc == 0)
 164                 DEBUGP(4, dev, "woke up: BulkOut full, returning 0 :(\n");
 165         else if (rc < 0)
 166                 DEBUGP(4, dev, "woke up: signal arrived\n");
 167
 168         return rc;
 169 }
 170
 171 /* Write to Sync Control Register */
 172 static int write_sync_reg(unsigned char val, struct reader_dev *dev)
 173 {
 174         int iobase = dev->p_dev->resource[0]->start;
 175         int rc;
 176
 177         rc = wait_for_bulk_out_ready(dev);
 178         if (rc <= 0)
 179                 return rc;
 180
 181         xoutb(val, iobase + REG_OFFSET_SYNC_CONTROL);
 182         rc = wait_for_bulk_out_ready(dev);
 183         if (rc <= 0)
 184                 return rc;
 185
 186         return 1;
 187 }
 188
 189 static int wait_for_bulk_in_ready(struct reader_dev *dev)
 190 {
 191         int i, rc;
 192         int iobase = dev->p_dev->resource[0]->start;
 193
 194         for (i = 0; i < POLL_LOOP_COUNT; i++) {
 195                 if ((xinb(iobase + REG_OFFSET_BUFFER_STATUS)
 196                     & BSR_BULK_IN_FULL) == BSR_BULK_IN_FULL) {
 197                         DEBUGP(3, dev, "BulkIn full (i=%d)\n", i);
 198                         return 1;
 199                 }
 200         }
 201
 202         DEBUGP(4, dev, "wait_event_interruptible_timeout(timeout=%ld\n",
 203                 dev->timeout);
 204         rc = wait_event_interruptible_timeout(dev->read_wait,
 205                                               test_and_clear_bit(BS_READABLE,
 206                                                         &dev->buffer_status),
 207                                               dev->timeout);
 208         if (rc > 0)
 209                 DEBUGP(4, dev, "woke up: BulkIn full\n");
 210         else if (rc == 0)
 211                 DEBUGP(4, dev, "woke up: BulkIn not full, returning 0 :(\n");
 212         else if (rc < 0)
 213                 DEBUGP(4, dev, "woke up: signal arrived\n");
 214
 215         return rc;
 216 }
 217
 218 static ssize_t cm4040_read(struct file *filp, char __user *buf,
 219                         size_t count, loff_t *ppos)
 220 {
 221         struct reader_dev *dev = filp->private_data;
 222         int iobase = dev->p_dev->resource[0]->start;
 223         size_t bytes_to_read;
 224         unsigned long i;
 225         size_t min_bytes_to_read;
 226         int rc;
 227         unsigned char uc;
 228
 229         DEBUGP(2, dev, "-> cm4040_read(%s,%d)\n", current->comm, current->pid);
 230
 231         if (count == 0)
 232                 return 0;
 233
 234         if (count < 10)
 235                 return -EFAULT;
 236
 237         if (filp->f_flags & O_NONBLOCK) {
 238                 DEBUGP(4, dev, "filep->f_flags O_NONBLOCK set\n");
 239                 DEBUGP(2, dev, "<- cm4040_read (failure)\n");
 240                 return -EAGAIN;
 241         }
 242
 243         if (!pcmcia_dev_present(dev->p_dev))
 244                 return -ENODEV;
 245
 246         for (i = 0; i < 5; i++) {
 247                 rc = wait_for_bulk_in_ready(dev);
 248                 if (rc <= 0) {
 249                         DEBUGP(5, dev, "wait_for_bulk_in_ready rc=%.2x\n", rc);
 250                         DEBUGP(2, dev, "<- cm4040_read (failed)\n");
 251                         if (rc == -ERESTARTSYS)
 252                                 return rc;
 253                         return -EIO;
 254                 }
 255                 dev->r_buf[i] = xinb(iobase + REG_OFFSET_BULK_IN);
 256 #ifdef CM4040_DEBUG
 257                 pr_debug("%lu:%2x ", i, dev->r_buf[i]);
 258         }
 259         pr_debug("\n");
 260 #else
 261         }
 262 #endif
 263
 264         bytes_to_read = 5 + le32_to_cpu(*(__le32 *)&dev->r_buf[1]);
 265
 266         DEBUGP(6, dev, "BytesToRead=%zu\n", bytes_to_read);
 267
 268         min_bytes_to_read = min(count, bytes_to_read + 5);
 269         min_bytes_to_read = min_t(size_t, min_bytes_to_read, READ_WRITE_BUFFER_SIZE);
 270
 271         DEBUGP(6, dev, "Min=%zu\n", min_bytes_to_read);
 272
 273         for (i = 0; i < (min_bytes_to_read-5); i++) {
 274                 rc = wait_for_bulk_in_ready(dev);
 275                 if (rc <= 0) {
 276                         DEBUGP(5, dev, "wait_for_bulk_in_ready rc=%.2x\n", rc);
 277                         DEBUGP(2, dev, "<- cm4040_read (failed)\n");
 278                         if (rc == -ERESTARTSYS)
 279                                 return rc;
 280                         return -EIO;
 281                 }
 282                 dev->r_buf[i+5] = xinb(iobase + REG_OFFSET_BULK_IN);
 283 #ifdef CM4040_DEBUG
 284                 pr_debug("%lu:%2x ", i, dev->r_buf[i]);
 285         }
 286         pr_debug("\n");
 287 #else
 288         }
 289 #endif
 290
 291         *ppos = min_bytes_to_read;
 292         if (copy_to_user(buf, dev->r_buf, min_bytes_to_read))
 293                 return -EFAULT;
 294
 295         rc = wait_for_bulk_in_ready(dev);
 296         if (rc <= 0) {
 297                 DEBUGP(5, dev, "wait_for_bulk_in_ready rc=%.2x\n", rc);
 298                 DEBUGP(2, dev, "<- cm4040_read (failed)\n");
 299                 if (rc == -ERESTARTSYS)
 300                         return rc;
 301                 return -EIO;
 302         }
 303
 304         rc = write_sync_reg(SCR_READER_TO_HOST_DONE, dev);
 305         if (rc <= 0) {
 306                 DEBUGP(5, dev, "write_sync_reg c=%.2x\n", rc);
 307                 DEBUGP(2, dev, "<- cm4040_read (failed)\n");
 308                 if (rc == -ERESTARTSYS)
 309                         return rc;
 310                 else
 311                         return -EIO;
 312         }
 313
 314         uc = xinb(iobase + REG_OFFSET_BULK_IN);
 315
 316         DEBUGP(2, dev, "<- cm4040_read (successfully)\n");
 317         return min_bytes_to_read;
 318 }
 319
 320 static ssize_t cm4040_write(struct file *filp, const char __user *buf,
 321                          size_t count, loff_t *ppos)
 322 {
 323         struct reader_dev *dev = filp->private_data;
 324         int iobase = dev->p_dev->resource[0]->start;
 325         ssize_t rc;
 326         int i;
 327         unsigned int bytes_to_write;
 328
 329         DEBUGP(2, dev, "-> cm4040_write(%s,%d)\n", current->comm, current->pid);
 330
 331         if (count == 0) {
 332                 DEBUGP(2, dev, "<- cm4040_write empty read (successfully)\n");
 333                 return 0;
 334         }
 335
 336         if ((count < 5) || (count > READ_WRITE_BUFFER_SIZE)) {
 337                 DEBUGP(2, dev, "<- cm4040_write buffersize=%Zd < 5\n", count);
 338                 return -EIO;
 339         }
 340
 341         if (filp->f_flags & O_NONBLOCK) {
 342                 DEBUGP(4, dev, "filep->f_flags O_NONBLOCK set\n");
 343                 DEBUGP(4, dev, "<- cm4040_write (failure)\n");
 344                 return -EAGAIN;
 345         }
 346
 347         if (!pcmcia_dev_present(dev->p_dev))
 348                 return -ENODEV;
 349
 350         bytes_to_write = count;
 351         if (copy_from_user(dev->s_buf, buf, bytes_to_write))
 352                 return -EFAULT;
 353
 354         switch (dev->s_buf[0]) {
 355                 case CMD_PC_TO_RDR_XFRBLOCK:
 356                 case CMD_PC_TO_RDR_SECURE:
 357                 case CMD_PC_TO_RDR_TEST_SECURE:
 358                 case CMD_PC_TO_RDR_OK_SECURE:
 359                         dev->timeout = CCID_DRIVER_BULK_DEFAULT_TIMEOUT;
 360                         break;
 361
 362                 case CMD_PC_TO_RDR_ICCPOWERON:
 363                         dev->timeout = CCID_DRIVER_ASYNC_POWERUP_TIMEOUT;
 364                         break;
 365
 366                 case CMD_PC_TO_RDR_GETSLOTSTATUS:
 367                 case CMD_PC_TO_RDR_ICCPOWEROFF:
 368                 case CMD_PC_TO_RDR_GETPARAMETERS:
 369                 case CMD_PC_TO_RDR_RESETPARAMETERS:
 370                 case CMD_PC_TO_RDR_SETPARAMETERS:
 371                 case CMD_PC_TO_RDR_ESCAPE:
 372                 case CMD_PC_TO_RDR_ICCCLOCK:
 373                 default:
 374                         dev->timeout = CCID_DRIVER_MINIMUM_TIMEOUT;
 375                         break;
 376         }
 377
 378         rc = write_sync_reg(SCR_HOST_TO_READER_START, dev);
 379         if (rc <= 0) {
 380                 DEBUGP(5, dev, "write_sync_reg c=%.2Zx\n", rc);
 381                 DEBUGP(2, dev, "<- cm4040_write (failed)\n");
 382                 if (rc == -ERESTARTSYS)
 383                         return rc;
 384                 else
 385                         return -EIO;
 386         }
 387
 388         DEBUGP(4, dev, "start \n");
 389
 390         for (i = 0; i < bytes_to_write; i++) {
 391                 rc = wait_for_bulk_out_ready(dev);
 392                 if (rc <= 0) {
 393                         DEBUGP(5, dev, "wait_for_bulk_out_ready rc=%.2Zx\n",
 394                                rc);
 395                         DEBUGP(2, dev, "<- cm4040_write (failed)\n");
 396                         if (rc == -ERESTARTSYS)
 397                                 return rc;
 398                         else
 399                                 return -EIO;
 400                 }
 401
 402                 xoutb(dev->s_buf[i],iobase + REG_OFFSET_BULK_OUT);
 403         }
 404         DEBUGP(4, dev, "end\n");
 405
 406         rc = write_sync_reg(SCR_HOST_TO_READER_DONE, dev);
 407
 408         if (rc <= 0) {
 409                 DEBUGP(5, dev, "write_sync_reg c=%.2Zx\n", rc);
 410                 DEBUGP(2, dev, "<- cm4040_write (failed)\n");
 411                 if (rc == -ERESTARTSYS)
 412                         return rc;
 413                 else
 414                         return -EIO;
 415         }
 416
 417         DEBUGP(2, dev, "<- cm4040_write (successfully)\n");
 418         return count;
 419 }
 420
 421 static unsigned int cm4040_poll(struct file *filp, poll_table *wait)
 422 {
 423         struct reader_dev *dev = filp->private_data;
 424         unsigned int mask = 0;
 425
 426         poll_wait(filp, &dev->poll_wait, wait);
 427
 428         if (test_and_clear_bit(BS_READABLE, &dev->buffer_status))
 429                 mask |= POLLIN | POLLRDNORM;
 430         if (test_and_clear_bit(BS_WRITABLE, &dev->buffer_status))
 431                 mask |= POLLOUT | POLLWRNORM;
 432
 433         DEBUGP(2, dev, "<- cm4040_poll(%u)\n", mask);
 434
 435         return mask;
 436 }
 437
 438 static int cm4040_open(struct inode *inode, struct file *filp)
 439 {
 440         struct reader_dev *dev;
 441         struct pcmcia_device *link;
 442         int minor = iminor(inode);
 443         int ret;
 444
 445         if (minor >= CM_MAX_DEV)
 446                 return -ENODEV;
 447
 448         mutex_lock(&cm4040_mutex);
 449         link = dev_table[minor];
 450         if (link == NULL || !pcmcia_dev_present(link)) {
 451                 ret = -ENODEV;
 452                 goto out;
 453         }
 454
 455         if (link->open) {
 456                 ret = -EBUSY;
 457                 goto out;
 458         }
 459
 460         dev = link->priv;
 461         filp->private_data = dev;
 462
 463         if (filp->f_flags & O_NONBLOCK) {
 464                 DEBUGP(4, dev, "filep->f_flags O_NONBLOCK set\n");
 465                 ret = -EAGAIN;
 466                 goto out;
 467         }
 468
 469         link->open = 1;
 470
 471         dev->poll_timer.data = (unsigned long) dev;
 472         mod_timer(&dev->poll_timer, jiffies + POLL_PERIOD);
 473
 474         DEBUGP(2, dev, "<- cm4040_open (successfully)\n");
 475         ret = nonseekable_open(inode, filp);
 476 out:
 477         mutex_unlock(&cm4040_mutex);
 478         return ret;
 479 }
 480
 481 static int cm4040_close(struct inode *inode, struct file *filp)
 482 {
 483         struct reader_dev *dev = filp->private_data;
 484         struct pcmcia_device *link;
 485         int minor = iminor(inode);
 486
 487         DEBUGP(2, dev, "-> cm4040_close(maj/min=%d.%d)\n", imajor(inode),
 488               iminor(inode));
 489
 490         if (minor >= CM_MAX_DEV)
 491                 return -ENODEV;
 492
 493         link = dev_table[minor];
 494         if (link == NULL)
 495                 return -ENODEV;
 496
 497         cm4040_stop_poll(dev);
 498
 499         link->open = 0;
 500         wake_up(&dev->devq);
 501
 502         DEBUGP(2, dev, "<- cm4040_close\n");
 503         return 0;
 504 }
 505
 506 static void cm4040_reader_release(struct pcmcia_device *link)
 507 {
 508         struct reader_dev *dev = link->priv;
 509
 510         DEBUGP(3, dev, "-> cm4040_reader_release\n");
 511         while (link->open) {
 512                 DEBUGP(3, dev, KERN_INFO MODULE_NAME ": delaying release "
 513                        "until process has terminated\n");
 514                 wait_event(dev->devq, (link->open == 0));
 515         }
 516         DEBUGP(3, dev, "<- cm4040_reader_release\n");
 517         return;
 518 }
 519
 520 static int cm4040_config_check(struct pcmcia_device *p_dev,
 521                                cistpl_cftable_entry_t *cfg,
 522                                cistpl_cftable_entry_t *dflt,
 523                                unsigned int vcc,
 524                                void *priv_data)
 525 {
 526         int rc;
 527         if (!cfg->io.nwin)
 528                 return -ENODEV;
 529
 530         /* Get the IOaddr */
 531         p_dev->resource[0]->start = cfg->io.win[0].base;
 532         p_dev->resource[0]->end = cfg->io.win[0].len;
 533         p_dev->resource[0]->flags |= pcmcia_io_cfg_data_width(cfg->io.flags);
 534         p_dev->io_lines = cfg->io.flags & CISTPL_IO_LINES_MASK;
 535         rc = pcmcia_request_io(p_dev);
 536
 537         dev_printk(KERN_INFO, &p_dev->dev,
 538                    "pcmcia_request_io returned 0x%x\n", rc);
 539         return rc;
 540 }
 541
 542
 543 static int reader_config(struct pcmcia_device *link, int devno)
 544 {
 545         struct reader_dev *dev;
 546         int fail_rc;
 547
 548         if (pcmcia_loop_config(link, cm4040_config_check, NULL))
 549                 goto cs_release;
 550
 551         link->conf.IntType = 00000002;
 552
 553         fail_rc = pcmcia_request_configuration(link, &link->conf);
 554         if (fail_rc != 0) {
 555                 dev_printk(KERN_INFO, &link->dev,
 556                            "pcmcia_request_configuration failed 0x%x\n",
 557                            fail_rc);
 558                 goto cs_release;
 559         }
 560
 561         dev = link->priv;
 562
 563         DEBUGP(2, dev, "device " DEVICE_NAME "%d at %pR\n", devno,
 564               link->resource[0]);
 565         DEBUGP(2, dev, "<- reader_config (succ)\n");
 566
 567         return 0;
 568
 569 cs_release:
 570         reader_release(link);
 571         return -ENODEV;
 572 }
 573
 574 static void reader_release(struct pcmcia_device *link)
 575 {
 576         cm4040_reader_release(link);
 577         pcmcia_disable_device(link);
 578 }
 579
 580 static int reader_probe(struct pcmcia_device *link)
 581 {
 582         struct reader_dev *dev;
 583         int i, ret;
 584
 585         for (i = 0; i < CM_MAX_DEV; i++) {
 586                 if (dev_table[i] == NULL)
 587                         break;
 588         }
 589
 590         if (i == CM_MAX_DEV)
 591                 return -ENODEV;
 592
 593         dev = kzalloc(sizeof(struct reader_dev), GFP_KERNEL);
 594         if (dev == NULL)
 595                 return -ENOMEM;
 596
 597         dev->timeout = CCID_DRIVER_MINIMUM_TIMEOUT;
 598         dev->buffer_status = 0;
 599
 600         link->priv = dev;
 601         dev->p_dev = link;
 602
 603         link->conf.IntType = INT_MEMORY_AND_IO;
 604         dev_table[i] = link;
 605
 606         init_waitqueue_head(&dev->devq);
 607         init_waitqueue_head(&dev->poll_wait);
 608         init_waitqueue_head(&dev->read_wait);
 609         init_waitqueue_head(&dev->write_wait);
 610         setup_timer(&dev->poll_timer, cm4040_do_poll, 0);
 611
 612         ret = reader_config(link, i);
 613         if (ret) {
 614                 dev_table[i] = NULL;
 615                 kfree(dev);
 616                 return ret;
 617         }
 618
 619         device_create(cmx_class, NULL, MKDEV(major, i), NULL, "cmx%d", i);
 620
 621         return 0;
 622 }
 623
 624 static void reader_detach(struct pcmcia_device *link)
 625 {
 626         struct reader_dev *dev = link->priv;
 627         int devno;
 628
 629         /* find device */
 630         for (devno = 0; devno < CM_MAX_DEV; devno++) {
 631                 if (dev_table[devno] == link)
 632                         break;
 633         }
 634         if (devno == CM_MAX_DEV)
 635                 return;
 636
 637         reader_release(link);
 638
 639         dev_table[devno] = NULL;
 640         kfree(dev);
 641
 642         device_destroy(cmx_class, MKDEV(major, devno));
 643
 644         return;
 645 }
 646
 647 static const struct file_operations reader_fops = {
 648         .owner          = THIS_MODULE,
 649         .read           = cm4040_read,
 650         .write          = cm4040_write,
 651         .open           = cm4040_open,
 652         .release        = cm4040_close,
 653         .poll           = cm4040_poll,
 654 };
 655
 656 static struct pcmcia_device_id cm4040_ids[] = {
 657         PCMCIA_DEVICE_MANF_CARD(0x0223, 0x0200),
 658         PCMCIA_DEVICE_PROD_ID12("OMNIKEY", "CardMan 4040",
 659                                 0xE32CDD8C, 0x8F23318B),
 660         PCMCIA_DEVICE_NULL,
 661 };
 662 MODULE_DEVICE_TABLE(pcmcia, cm4040_ids);
 663
 664 static struct pcmcia_driver reader_driver = {
 665         .owner          = THIS_MODULE,
 666         .drv            = {
 667                 .name   = "cm4040_cs",
 668         },
 669         .probe          = reader_probe,
 670         .remove         = reader_detach,
 671         .id_table       = cm4040_ids,
 672 };
 673
 674 static int __init cm4040_init(void)
 675 {
 676         int rc;
 677
 678         printk(KERN_INFO "%s\n", version);
 679         cmx_class = class_create(THIS_MODULE, "cardman_4040");
 680         if (IS_ERR(cmx_class))
 681                 return PTR_ERR(cmx_class);
 682
 683         major = register_chrdev(0, DEVICE_NAME, &reader_fops);
 684         if (major < 0) {
 685                 printk(KERN_WARNING MODULE_NAME
 686                         ": could not get major number\n");
 687                 class_destroy(cmx_class);
 688                 return major;
 689         }
 690
 691         rc = pcmcia_register_driver(&reader_driver);
 692         if (rc < 0) {
 693                 unregister_chrdev(major, DEVICE_NAME);
 694                 class_destroy(cmx_class);
 695                 return rc;
 696         }
 697
 698         return 0;
 699 }
 700
 701 static void __exit cm4040_exit(void)
 702 {
 703         printk(KERN_INFO MODULE_NAME ": unloading\n");
 704         pcmcia_unregister_driver(&reader_driver);
 705         unregister_chrdev(major, DEVICE_NAME);
 706         class_destroy(cmx_class);
 707 }
 708
 709 module_init(cm4040_init);
 710 module_exit(cm4040_exit);
 711 MODULE_LICENSE("Dual BSD/GPL");