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