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