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(unsigned long dummy)
 108 {
 109         struct reader_dev *dev = (struct reader_dev *) dummy;
 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         unsigned char uc;
 225
 226         DEBUGP(2, dev, "-> cm4040_read(%s,%d)\n", current->comm, current->pid);
 227
 228         if (count == 0)
 229                 return 0;
 230
 231         if (count < 10)
 232                 return -EFAULT;
 233
 234         if (filp->f_flags & O_NONBLOCK) {
 235                 DEBUGP(4, dev, "filep->f_flags O_NONBLOCK set\n");
 236                 DEBUGP(2, dev, "<- cm4040_read (failure)\n");
 237                 return -EAGAIN;
 238         }
 239
 240         if (!pcmcia_dev_present(dev->p_dev))
 241                 return -ENODEV;
 242
 243         for (i = 0; i < 5; i++) {
 244                 rc = wait_for_bulk_in_ready(dev);
 245                 if (rc <= 0) {
 246                         DEBUGP(5, dev, "wait_for_bulk_in_ready rc=%.2x\n", rc);
 247                         DEBUGP(2, dev, "<- cm4040_read (failed)\n");
 248                         if (rc == -ERESTARTSYS)
 249                                 return rc;
 250                         return -EIO;
 251                 }
 252                 dev->r_buf[i] = xinb(iobase + REG_OFFSET_BULK_IN);
 253 #ifdef CM4040_DEBUG
 254                 pr_debug("%lu:%2x ", i, dev->r_buf[i]);
 255         }
 256         pr_debug("\n");
 257 #else
 258         }
 259 #endif
 260
 261         bytes_to_read = 5 + le32_to_cpu(*(__le32 *)&dev->r_buf[1]);
 262
 263         DEBUGP(6, dev, "BytesToRead=%zu\n", bytes_to_read);
 264
 265         min_bytes_to_read = min(count, bytes_to_read + 5);
 266         min_bytes_to_read = min_t(size_t, min_bytes_to_read, READ_WRITE_BUFFER_SIZE);
 267
 268         DEBUGP(6, dev, "Min=%zu\n", min_bytes_to_read);
 269
 270         for (i = 0; i < (min_bytes_to_read-5); i++) {
 271                 rc = wait_for_bulk_in_ready(dev);
 272                 if (rc <= 0) {
 273                         DEBUGP(5, dev, "wait_for_bulk_in_ready rc=%.2x\n", rc);
 274                         DEBUGP(2, dev, "<- cm4040_read (failed)\n");
 275                         if (rc == -ERESTARTSYS)
 276                                 return rc;
 277                         return -EIO;
 278                 }
 279                 dev->r_buf[i+5] = xinb(iobase + REG_OFFSET_BULK_IN);
 280 #ifdef CM4040_DEBUG
 281                 pr_debug("%lu:%2x ", i, dev->r_buf[i]);
 282         }
 283         pr_debug("\n");
 284 #else
 285         }
 286 #endif
 287
 288         *ppos = min_bytes_to_read;
 289         if (copy_to_user(buf, dev->r_buf, min_bytes_to_read))
 290                 return -EFAULT;
 291
 292         rc = wait_for_bulk_in_ready(dev);
 293         if (rc <= 0) {
 294                 DEBUGP(5, dev, "wait_for_bulk_in_ready rc=%.2x\n", rc);
 295                 DEBUGP(2, dev, "<- cm4040_read (failed)\n");
 296                 if (rc == -ERESTARTSYS)
 297                         return rc;
 298                 return -EIO;
 299         }
 300
 301         rc = write_sync_reg(SCR_READER_TO_HOST_DONE, dev);
 302         if (rc <= 0) {
 303                 DEBUGP(5, dev, "write_sync_reg c=%.2x\n", rc);
 304                 DEBUGP(2, dev, "<- cm4040_read (failed)\n");
 305                 if (rc == -ERESTARTSYS)
 306                         return rc;
 307                 else
 308                         return -EIO;
 309         }
 310
 311         uc = xinb(iobase + REG_OFFSET_BULK_IN);
 312
 313         DEBUGP(2, dev, "<- cm4040_read (successfully)\n");
 314         return min_bytes_to_read;
 315 }
 316
 317 static ssize_t cm4040_write(struct file *filp, const char __user *buf,
 318                          size_t count, loff_t *ppos)
 319 {
 320         struct reader_dev *dev = filp->private_data;
 321         int iobase = dev->p_dev->resource[0]->start;
 322         ssize_t rc;
 323         int i;
 324         unsigned int bytes_to_write;
 325
 326         DEBUGP(2, dev, "-> cm4040_write(%s,%d)\n", current->comm, current->pid);
 327
 328         if (count == 0) {
 329                 DEBUGP(2, dev, "<- cm4040_write empty read (successfully)\n");
 330                 return 0;
 331         }
 332
 333         if ((count < 5) || (count > READ_WRITE_BUFFER_SIZE)) {
 334                 DEBUGP(2, dev, "<- cm4040_write buffersize=%zd < 5\n", count);
 335                 return -EIO;
 336         }
 337
 338         if (filp->f_flags & O_NONBLOCK) {
 339                 DEBUGP(4, dev, "filep->f_flags O_NONBLOCK set\n");
 340                 DEBUGP(4, dev, "<- cm4040_write (failure)\n");
 341                 return -EAGAIN;
 342         }
 343
 344         if (!pcmcia_dev_present(dev->p_dev))
 345                 return -ENODEV;
 346
 347         bytes_to_write = count;
 348         if (copy_from_user(dev->s_buf, buf, bytes_to_write))
 349                 return -EFAULT;
 350
 351         switch (dev->s_buf[0]) {
 352                 case CMD_PC_TO_RDR_XFRBLOCK:
 353                 case CMD_PC_TO_RDR_SECURE:
 354                 case CMD_PC_TO_RDR_TEST_SECURE:
 355                 case CMD_PC_TO_RDR_OK_SECURE:
 356                         dev->timeout = CCID_DRIVER_BULK_DEFAULT_TIMEOUT;
 357                         break;
 358
 359                 case CMD_PC_TO_RDR_ICCPOWERON:
 360                         dev->timeout = CCID_DRIVER_ASYNC_POWERUP_TIMEOUT;
 361                         break;
 362
 363                 case CMD_PC_TO_RDR_GETSLOTSTATUS:
 364                 case CMD_PC_TO_RDR_ICCPOWEROFF:
 365                 case CMD_PC_TO_RDR_GETPARAMETERS:
 366                 case CMD_PC_TO_RDR_RESETPARAMETERS:
 367                 case CMD_PC_TO_RDR_SETPARAMETERS:
 368                 case CMD_PC_TO_RDR_ESCAPE:
 369                 case CMD_PC_TO_RDR_ICCCLOCK:
 370                 default:
 371                         dev->timeout = CCID_DRIVER_MINIMUM_TIMEOUT;
 372                         break;
 373         }
 374
 375         rc = write_sync_reg(SCR_HOST_TO_READER_START, dev);
 376         if (rc <= 0) {
 377                 DEBUGP(5, dev, "write_sync_reg c=%.2Zx\n", rc);
 378                 DEBUGP(2, dev, "<- cm4040_write (failed)\n");
 379                 if (rc == -ERESTARTSYS)
 380                         return rc;
 381                 else
 382                         return -EIO;
 383         }
 384
 385         DEBUGP(4, dev, "start \n");
 386
 387         for (i = 0; i < bytes_to_write; i++) {
 388                 rc = wait_for_bulk_out_ready(dev);
 389                 if (rc <= 0) {
 390                         DEBUGP(5, dev, "wait_for_bulk_out_ready rc=%.2Zx\n",
 391                                rc);
 392                         DEBUGP(2, dev, "<- cm4040_write (failed)\n");
 393                         if (rc == -ERESTARTSYS)
 394                                 return rc;
 395                         else
 396                                 return -EIO;
 397                 }
 398
 399                 xoutb(dev->s_buf[i],iobase + REG_OFFSET_BULK_OUT);
 400         }
 401         DEBUGP(4, dev, "end\n");
 402
 403         rc = write_sync_reg(SCR_HOST_TO_READER_DONE, dev);
 404
 405         if (rc <= 0) {
 406                 DEBUGP(5, dev, "write_sync_reg c=%.2Zx\n", rc);
 407                 DEBUGP(2, dev, "<- cm4040_write (failed)\n");
 408                 if (rc == -ERESTARTSYS)
 409                         return rc;
 410                 else
 411                         return -EIO;
 412         }
 413
 414         DEBUGP(2, dev, "<- cm4040_write (successfully)\n");
 415         return count;
 416 }
 417
 418 static unsigned int cm4040_poll(struct file *filp, poll_table *wait)
 419 {
 420         struct reader_dev *dev = filp->private_data;
 421         unsigned int mask = 0;
 422
 423         poll_wait(filp, &dev->poll_wait, wait);
 424
 425         if (test_and_clear_bit(BS_READABLE, &dev->buffer_status))
 426                 mask |= POLLIN | POLLRDNORM;
 427         if (test_and_clear_bit(BS_WRITABLE, &dev->buffer_status))
 428                 mask |= POLLOUT | POLLWRNORM;
 429
 430         DEBUGP(2, dev, "<- cm4040_poll(%u)\n", mask);
 431
 432         return mask;
 433 }
 434
 435 static int cm4040_open(struct inode *inode, struct file *filp)
 436 {
 437         struct reader_dev *dev;
 438         struct pcmcia_device *link;
 439         int minor = iminor(inode);
 440         int ret;
 441
 442         if (minor >= CM_MAX_DEV)
 443                 return -ENODEV;
 444
 445         mutex_lock(&cm4040_mutex);
 446         link = dev_table[minor];
 447         if (link == NULL || !pcmcia_dev_present(link)) {
 448                 ret = -ENODEV;
 449                 goto out;
 450         }
 451
 452         if (link->open) {
 453                 ret = -EBUSY;
 454                 goto out;
 455         }
 456
 457         dev = link->priv;
 458         filp->private_data = dev;
 459
 460         if (filp->f_flags & O_NONBLOCK) {
 461                 DEBUGP(4, dev, "filep->f_flags O_NONBLOCK set\n");
 462                 ret = -EAGAIN;
 463                 goto out;
 464         }
 465
 466         link->open = 1;
 467
 468         dev->poll_timer.data = (unsigned long) dev;
 469         mod_timer(&dev->poll_timer, jiffies + POLL_PERIOD);
 470
 471         DEBUGP(2, dev, "<- cm4040_open (successfully)\n");
 472         ret = nonseekable_open(inode, filp);
 473 out:
 474         mutex_unlock(&cm4040_mutex);
 475         return ret;
 476 }
 477
 478 static int cm4040_close(struct inode *inode, struct file *filp)
 479 {
 480         struct reader_dev *dev = filp->private_data;
 481         struct pcmcia_device *link;
 482         int minor = iminor(inode);
 483
 484         DEBUGP(2, dev, "-> cm4040_close(maj/min=%d.%d)\n", imajor(inode),
 485               iminor(inode));
 486
 487         if (minor >= CM_MAX_DEV)
 488                 return -ENODEV;
 489
 490         link = dev_table[minor];
 491         if (link == NULL)
 492                 return -ENODEV;
 493
 494         cm4040_stop_poll(dev);
 495
 496         link->open = 0;
 497         wake_up(&dev->devq);
 498
 499         DEBUGP(2, dev, "<- cm4040_close\n");
 500         return 0;
 501 }
 502
 503 static void cm4040_reader_release(struct pcmcia_device *link)
 504 {
 505         struct reader_dev *dev = link->priv;
 506
 507         DEBUGP(3, dev, "-> cm4040_reader_release\n");
 508         while (link->open) {
 509                 DEBUGP(3, dev, KERN_INFO MODULE_NAME ": delaying release "
 510                        "until process has terminated\n");
 511                 wait_event(dev->devq, (link->open == 0));
 512         }
 513         DEBUGP(3, dev, "<- cm4040_reader_release\n");
 514         return;
 515 }
 516
 517 static int cm4040_config_check(struct pcmcia_device *p_dev, void *priv_data)
 518 {
 519         return pcmcia_request_io(p_dev);
 520 }
 521
 522
 523 static int reader_config(struct pcmcia_device *link, int devno)
 524 {
 525         struct reader_dev *dev;
 526         int fail_rc;
 527
 528         link->config_flags |= CONF_AUTO_SET_IO;
 529
 530         if (pcmcia_loop_config(link, cm4040_config_check, NULL))
 531                 goto cs_release;
 532
 533         fail_rc = pcmcia_enable_device(link);
 534         if (fail_rc != 0) {
 535                 dev_info(&link->dev, "pcmcia_enable_device failed 0x%x\n",
 536                          fail_rc);
 537                 goto cs_release;
 538         }
 539
 540         dev = link->priv;
 541
 542         DEBUGP(2, dev, "device " DEVICE_NAME "%d at %pR\n", devno,
 543               link->resource[0]);
 544         DEBUGP(2, dev, "<- reader_config (succ)\n");
 545
 546         return 0;
 547
 548 cs_release:
 549         reader_release(link);
 550         return -ENODEV;
 551 }
 552
 553 static void reader_release(struct pcmcia_device *link)
 554 {
 555         cm4040_reader_release(link);
 556         pcmcia_disable_device(link);
 557 }
 558
 559 static int reader_probe(struct pcmcia_device *link)
 560 {
 561         struct reader_dev *dev;
 562         int i, ret;
 563
 564         for (i = 0; i < CM_MAX_DEV; i++) {
 565                 if (dev_table[i] == NULL)
 566                         break;
 567         }
 568
 569         if (i == CM_MAX_DEV)
 570                 return -ENODEV;
 571
 572         dev = kzalloc(sizeof(struct reader_dev), GFP_KERNEL);
 573         if (dev == NULL)
 574                 return -ENOMEM;
 575
 576         dev->timeout = CCID_DRIVER_MINIMUM_TIMEOUT;
 577         dev->buffer_status = 0;
 578
 579         link->priv = dev;
 580         dev->p_dev = link;
 581
 582         dev_table[i] = link;
 583
 584         init_waitqueue_head(&dev->devq);
 585         init_waitqueue_head(&dev->poll_wait);
 586         init_waitqueue_head(&dev->read_wait);
 587         init_waitqueue_head(&dev->write_wait);
 588         setup_timer(&dev->poll_timer, cm4040_do_poll, 0);
 589
 590         ret = reader_config(link, i);
 591         if (ret) {
 592                 dev_table[i] = NULL;
 593                 kfree(dev);
 594                 return ret;
 595         }
 596
 597         device_create(cmx_class, NULL, MKDEV(major, i), NULL, "cmx%d", i);
 598
 599         return 0;
 600 }
 601
 602 static void reader_detach(struct pcmcia_device *link)
 603 {
 604         struct reader_dev *dev = link->priv;
 605         int devno;
 606
 607         /* find device */
 608         for (devno = 0; devno < CM_MAX_DEV; devno++) {
 609                 if (dev_table[devno] == link)
 610                         break;
 611         }
 612         if (devno == CM_MAX_DEV)
 613                 return;
 614
 615         reader_release(link);
 616
 617         dev_table[devno] = NULL;
 618         kfree(dev);
 619
 620         device_destroy(cmx_class, MKDEV(major, devno));
 621
 622         return;
 623 }
 624
 625 static const struct file_operations reader_fops = {
 626         .owner          = THIS_MODULE,
 627         .read           = cm4040_read,
 628         .write          = cm4040_write,
 629         .open           = cm4040_open,
 630         .release        = cm4040_close,
 631         .poll           = cm4040_poll,
 632         .llseek         = no_llseek,
 633 };
 634
 635 static const struct pcmcia_device_id cm4040_ids[] = {
 636         PCMCIA_DEVICE_MANF_CARD(0x0223, 0x0200),
 637         PCMCIA_DEVICE_PROD_ID12("OMNIKEY", "CardMan 4040",
 638                                 0xE32CDD8C, 0x8F23318B),
 639         PCMCIA_DEVICE_NULL,
 640 };
 641 MODULE_DEVICE_TABLE(pcmcia, cm4040_ids);
 642
 643 static struct pcmcia_driver reader_driver = {
 644         .owner          = THIS_MODULE,
 645         .name           = "cm4040_cs",
 646         .probe          = reader_probe,
 647         .remove         = reader_detach,
 648         .id_table       = cm4040_ids,
 649 };
 650
 651 static int __init cm4040_init(void)
 652 {
 653         int rc;
 654
 655         cmx_class = class_create(THIS_MODULE, "cardman_4040");
 656         if (IS_ERR(cmx_class))
 657                 return PTR_ERR(cmx_class);
 658
 659         major = register_chrdev(0, DEVICE_NAME, &reader_fops);
 660         if (major < 0) {
 661                 printk(KERN_WARNING MODULE_NAME
 662                         ": could not get major number\n");
 663                 class_destroy(cmx_class);
 664                 return major;
 665         }
 666
 667         rc = pcmcia_register_driver(&reader_driver);
 668         if (rc < 0) {
 669                 unregister_chrdev(major, DEVICE_NAME);
 670                 class_destroy(cmx_class);
 671                 return rc;
 672         }
 673
 674         return 0;
 675 }
 676
 677 static void __exit cm4040_exit(void)
 678 {
 679         pcmcia_unregister_driver(&reader_driver);
 680         unregister_chrdev(major, DEVICE_NAME);
 681         class_destroy(cmx_class);
 682 }
 683
 684 module_init(cm4040_init);
 685 module_exit(cm4040_exit);
 686 MODULE_LICENSE("Dual BSD/GPL");