Pileus Git - ~andy/linux/blob - drivers/media/radio/radio-cadet.c

   1 /* radio-cadet.c - A video4linux driver for the ADS Cadet AM/FM Radio Card
   2  *
   3  * by Fred Gleason <fredg@wava.com>
   4  * Version 0.3.3
   5  *
   6  * (Loosely) based on code for the Aztech radio card by
   7  *
   8  * Russell Kroll    (rkroll@exploits.org)
   9  * Quay Ly
  10  * Donald Song
  11  * Jason Lewis      (jlewis@twilight.vtc.vsc.edu)
  12  * Scott McGrath    (smcgrath@twilight.vtc.vsc.edu)
  13  * William McGrath  (wmcgrath@twilight.vtc.vsc.edu)
  14  *
  15  * History:
  16  * 2000-04-29   Russell Kroll <rkroll@exploits.org>
  17  *              Added ISAPnP detection for Linux 2.3/2.4
  18  *
  19  * 2001-01-10   Russell Kroll <rkroll@exploits.org>
  20  *              Removed dead CONFIG_RADIO_CADET_PORT code
  21  *              PnP detection on load is now default (no args necessary)
  22  *
  23  * 2002-01-17   Adam Belay <ambx1@neo.rr.com>
  24  *              Updated to latest pnp code
  25  *
  26  * 2003-01-31   Alan Cox <alan@lxorguk.ukuu.org.uk>
  27  *              Cleaned up locking, delay code, general odds and ends
  28  *
  29  * 2006-07-30   Hans J. Koch <koch@hjk-az.de>
  30  *              Changed API to V4L2
  31  */
  32
  33 #include <linux/module.h>       /* Modules                      */
  34 #include <linux/init.h>         /* Initdata                     */
  35 #include <linux/ioport.h>       /* request_region               */
  36 #include <linux/delay.h>        /* udelay                       */
  37 #include <linux/videodev2.h>    /* V4L2 API defs                */
  38 #include <linux/param.h>
  39 #include <linux/pnp.h>
  40 #include <linux/sched.h>
  41 #include <linux/io.h>           /* outb, outb_p                 */
  42 #include <media/v4l2-device.h>
  43 #include <media/v4l2-ioctl.h>
  44 #include <media/v4l2-ctrls.h>
  45 #include <media/v4l2-fh.h>
  46 #include <media/v4l2-event.h>
  47
  48 MODULE_AUTHOR("Fred Gleason, Russell Kroll, Quay Lu, Donald Song, Jason Lewis, Scott McGrath, William McGrath");
  49 MODULE_DESCRIPTION("A driver for the ADS Cadet AM/FM/RDS radio card.");
  50 MODULE_LICENSE("GPL");
  51 MODULE_VERSION("0.3.4");
  52
  53 static int io = -1;             /* default to isapnp activation */
  54 static int radio_nr = -1;
  55
  56 module_param(io, int, 0);
  57 MODULE_PARM_DESC(io, "I/O address of Cadet card (0x330,0x332,0x334,0x336,0x338,0x33a,0x33c,0x33e)");
  58 module_param(radio_nr, int, 0);
  59
  60 #define RDS_BUFFER 256
  61 #define RDS_RX_FLAG 1
  62 #define MBS_RX_FLAG 2
  63
  64 struct cadet {
  65         struct v4l2_device v4l2_dev;
  66         struct video_device vdev;
  67         struct v4l2_ctrl_handler ctrl_handler;
  68         int io;
  69         int curtuner;
  70         int tunestat;
  71         int sigstrength;
  72         wait_queue_head_t read_queue;
  73         struct timer_list readtimer;
  74         __u8 rdsin, rdsout, rdsstat;
  75         unsigned char rdsbuf[RDS_BUFFER];
  76         struct mutex lock;
  77         int reading;
  78 };
  79
  80 static struct cadet cadet_card;
  81
  82 /*
  83  * Signal Strength Threshold Values
  84  * The V4L API spec does not define any particular unit for the signal
  85  * strength value.  These values are in microvolts of RF at the tuner's input.
  86  */
  87 static __u16 sigtable[2][4] = {
  88         {  5, 10, 30,  150 },
  89         { 28, 40, 63, 1000 }
  90 };
  91
  92
  93 static int cadet_getstereo(struct cadet *dev)
  94 {
  95         int ret = V4L2_TUNER_SUB_MONO;
  96
  97         if (dev->curtuner != 0) /* Only FM has stereo capability! */
  98                 return V4L2_TUNER_SUB_MONO;
  99
 100         outb(7, dev->io);          /* Select tuner control */
 101         if ((inb(dev->io + 1) & 0x40) == 0)
 102                 ret = V4L2_TUNER_SUB_STEREO;
 103         return ret;
 104 }
 105
 106 static unsigned cadet_gettune(struct cadet *dev)
 107 {
 108         int curvol, i;
 109         unsigned fifo = 0;
 110
 111         /*
 112          * Prepare for read
 113          */
 114
 115         outb(7, dev->io);       /* Select tuner control */
 116         curvol = inb(dev->io + 1); /* Save current volume/mute setting */
 117         outb(0x00, dev->io + 1);  /* Ensure WRITE-ENABLE is LOW */
 118         dev->tunestat = 0xffff;
 119
 120         /*
 121          * Read the shift register
 122          */
 123         for (i = 0; i < 25; i++) {
 124                 fifo = (fifo << 1) | ((inb(dev->io + 1) >> 7) & 0x01);
 125                 if (i < 24) {
 126                         outb(0x01, dev->io + 1);
 127                         dev->tunestat &= inb(dev->io + 1);
 128                         outb(0x00, dev->io + 1);
 129                 }
 130         }
 131
 132         /*
 133          * Restore volume/mute setting
 134          */
 135         outb(curvol, dev->io + 1);
 136         return fifo;
 137 }
 138
 139 static unsigned cadet_getfreq(struct cadet *dev)
 140 {
 141         int i;
 142         unsigned freq = 0, test, fifo = 0;
 143
 144         /*
 145          * Read current tuning
 146          */
 147         fifo = cadet_gettune(dev);
 148
 149         /*
 150          * Convert to actual frequency
 151          */
 152         if (dev->curtuner == 0) {    /* FM */
 153                 test = 12500;
 154                 for (i = 0; i < 14; i++) {
 155                         if ((fifo & 0x01) != 0)
 156                                 freq += test;
 157                         test = test << 1;
 158                         fifo = fifo >> 1;
 159                 }
 160                 freq -= 10700000;           /* IF frequency is 10.7 MHz */
 161                 freq = (freq * 16) / 1000;   /* Make it 1/16 kHz */
 162         }
 163         if (dev->curtuner == 1)    /* AM */
 164                 freq = ((fifo & 0x7fff) - 2010) * 16;
 165
 166         return freq;
 167 }
 168
 169 static void cadet_settune(struct cadet *dev, unsigned fifo)
 170 {
 171         int i;
 172         unsigned test;
 173
 174         outb(7, dev->io);                /* Select tuner control */
 175         /*
 176          * Write the shift register
 177          */
 178         test = 0;
 179         test = (fifo >> 23) & 0x02;      /* Align data for SDO */
 180         test |= 0x1c;                /* SDM=1, SWE=1, SEN=1, SCK=0 */
 181         outb(7, dev->io);                /* Select tuner control */
 182         outb(test, dev->io + 1);           /* Initialize for write */
 183         for (i = 0; i < 25; i++) {
 184                 test |= 0x01;              /* Toggle SCK High */
 185                 outb(test, dev->io + 1);
 186                 test &= 0xfe;              /* Toggle SCK Low */
 187                 outb(test, dev->io + 1);
 188                 fifo = fifo << 1;            /* Prepare the next bit */
 189                 test = 0x1c | ((fifo >> 23) & 0x02);
 190                 outb(test, dev->io + 1);
 191         }
 192 }
 193
 194 static void cadet_setfreq(struct cadet *dev, unsigned freq)
 195 {
 196         unsigned fifo;
 197         int i, j, test;
 198         int curvol;
 199
 200         /*
 201          * Formulate a fifo command
 202          */
 203         fifo = 0;
 204         if (dev->curtuner == 0) {    /* FM */
 205                 test = 102400;
 206                 freq = freq / 16;       /* Make it kHz */
 207                 freq += 10700;               /* IF is 10700 kHz */
 208                 for (i = 0; i < 14; i++) {
 209                         fifo = fifo << 1;
 210                         if (freq >= test) {
 211                                 fifo |= 0x01;
 212                                 freq -= test;
 213                         }
 214                         test = test >> 1;
 215                 }
 216         }
 217         if (dev->curtuner == 1) {    /* AM */
 218                 fifo = (freq / 16) + 2010;            /* Make it kHz */
 219                 fifo |= 0x100000;            /* Select AM Band */
 220         }
 221
 222         /*
 223          * Save current volume/mute setting
 224          */
 225
 226         outb(7, dev->io);                /* Select tuner control */
 227         curvol = inb(dev->io + 1);
 228
 229         /*
 230          * Tune the card
 231          */
 232         for (j = 3; j > -1; j--) {
 233                 cadet_settune(dev, fifo | (j << 16));
 234
 235                 outb(7, dev->io);         /* Select tuner control */
 236                 outb(curvol, dev->io + 1);
 237
 238                 msleep(100);
 239
 240                 cadet_gettune(dev);
 241                 if ((dev->tunestat & 0x40) == 0) {   /* Tuned */
 242                         dev->sigstrength = sigtable[dev->curtuner][j];
 243                         return;
 244                 }
 245         }
 246         dev->sigstrength = 0;
 247 }
 248
 249
 250 static void cadet_handler(unsigned long data)
 251 {
 252         struct cadet *dev = (void *)data;
 253
 254         /* Service the RDS fifo */
 255         if (mutex_trylock(&dev->lock)) {
 256                 outb(0x3, dev->io);       /* Select RDS Decoder Control */
 257                 if ((inb(dev->io + 1) & 0x20) != 0)
 258                         printk(KERN_CRIT "cadet: RDS fifo overflow\n");
 259                 outb(0x80, dev->io);      /* Select RDS fifo */
 260                 while ((inb(dev->io) & 0x80) != 0) {
 261                         dev->rdsbuf[dev->rdsin] = inb(dev->io + 1);
 262                         if (dev->rdsin == dev->rdsout)
 263                                 printk(KERN_WARNING "cadet: RDS buffer overflow\n");
 264                         else
 265                                 dev->rdsin++;
 266                 }
 267                 mutex_unlock(&dev->lock);
 268         }
 269
 270         /*
 271          * Service pending read
 272          */
 273         if (dev->rdsin != dev->rdsout)
 274                 wake_up_interruptible(&dev->read_queue);
 275
 276         /*
 277          * Clean up and exit
 278          */
 279         init_timer(&dev->readtimer);
 280         dev->readtimer.function = cadet_handler;
 281         dev->readtimer.data = (unsigned long)0;
 282         dev->readtimer.expires = jiffies + msecs_to_jiffies(50);
 283         add_timer(&dev->readtimer);
 284 }
 285
 286
 287 static ssize_t cadet_read(struct file *file, char __user *data, size_t count, loff_t *ppos)
 288 {
 289         struct cadet *dev = video_drvdata(file);
 290         unsigned char readbuf[RDS_BUFFER];
 291         int i = 0;
 292
 293         mutex_lock(&dev->lock);
 294         if (dev->rdsstat == 0) {
 295                 dev->rdsstat = 1;
 296                 outb(0x80, dev->io);        /* Select RDS fifo */
 297                 init_timer(&dev->readtimer);
 298                 dev->readtimer.function = cadet_handler;
 299                 dev->readtimer.data = (unsigned long)dev;
 300                 dev->readtimer.expires = jiffies + msecs_to_jiffies(50);
 301                 add_timer(&dev->readtimer);
 302         }
 303         if (dev->rdsin == dev->rdsout) {
 304                 if (file->f_flags & O_NONBLOCK) {
 305                         i = -EWOULDBLOCK;
 306                         goto unlock;
 307                 }
 308                 interruptible_sleep_on(&dev->read_queue);
 309         }
 310         while (i < count && dev->rdsin != dev->rdsout)
 311                 readbuf[i++] = dev->rdsbuf[dev->rdsout++];
 312
 313         if (copy_to_user(data, readbuf, i))
 314                 i = -EFAULT;
 315 unlock:
 316         mutex_unlock(&dev->lock);
 317         return i;
 318 }
 319
 320
 321 static int vidioc_querycap(struct file *file, void *priv,
 322                                 struct v4l2_capability *v)
 323 {
 324         strlcpy(v->driver, "ADS Cadet", sizeof(v->driver));
 325         strlcpy(v->card, "ADS Cadet", sizeof(v->card));
 326         strlcpy(v->bus_info, "ISA", sizeof(v->bus_info));
 327         v->device_caps = V4L2_CAP_TUNER | V4L2_CAP_RADIO |
 328                           V4L2_CAP_READWRITE | V4L2_CAP_RDS_CAPTURE;
 329         v->capabilities = v->device_caps | V4L2_CAP_DEVICE_CAPS;
 330         return 0;
 331 }
 332
 333 static int vidioc_g_tuner(struct file *file, void *priv,
 334                                 struct v4l2_tuner *v)
 335 {
 336         struct cadet *dev = video_drvdata(file);
 337
 338         v->type = V4L2_TUNER_RADIO;
 339         switch (v->index) {
 340         case 0:
 341                 strlcpy(v->name, "FM", sizeof(v->name));
 342                 v->capability = V4L2_TUNER_CAP_STEREO | V4L2_TUNER_CAP_RDS |
 343                         V4L2_TUNER_CAP_RDS_BLOCK_IO | V4L2_TUNER_CAP_LOW;
 344                 v->rangelow = 1400000;     /* 87.5 MHz */
 345                 v->rangehigh = 1728000;    /* 108.0 MHz */
 346                 v->rxsubchans = cadet_getstereo(dev);
 347                 v->audmode = V4L2_TUNER_MODE_STEREO;
 348                 v->rxsubchans |= V4L2_TUNER_SUB_RDS;
 349                 break;
 350         case 1:
 351                 strlcpy(v->name, "AM", sizeof(v->name));
 352                 v->capability = V4L2_TUNER_CAP_LOW;
 353                 v->rangelow = 8320;      /* 520 kHz */
 354                 v->rangehigh = 26400;    /* 1650 kHz */
 355                 v->rxsubchans = V4L2_TUNER_SUB_MONO;
 356                 v->audmode = V4L2_TUNER_MODE_MONO;
 357                 break;
 358         default:
 359                 return -EINVAL;
 360         }
 361         v->signal = dev->sigstrength; /* We might need to modify scaling of this */
 362         return 0;
 363 }
 364
 365 static int vidioc_s_tuner(struct file *file, void *priv,
 366                                 struct v4l2_tuner *v)
 367 {
 368         if (v->index != 0 && v->index != 1)
 369                 return -EINVAL;
 370         return 0;
 371 }
 372
 373 static int vidioc_g_frequency(struct file *file, void *priv,
 374                                 struct v4l2_frequency *f)
 375 {
 376         struct cadet *dev = video_drvdata(file);
 377
 378         if (f->tuner > 1)
 379                 return -EINVAL;
 380         f->type = V4L2_TUNER_RADIO;
 381         f->frequency = cadet_getfreq(dev);
 382         return 0;
 383 }
 384
 385
 386 static int vidioc_s_frequency(struct file *file, void *priv,
 387                                 struct v4l2_frequency *f)
 388 {
 389         struct cadet *dev = video_drvdata(file);
 390
 391         if (f->type != V4L2_TUNER_RADIO)
 392                 return -EINVAL;
 393         if (f->tuner == 0) {
 394                 if (f->frequency < 1400000)
 395                         f->frequency = 1400000;
 396                 else if (f->frequency > 1728000)
 397                         f->frequency = 1728000;
 398         } else if (f->tuner == 1) {
 399                 if (f->frequency < 8320)
 400                         f->frequency = 8320;
 401                 else if (f->frequency > 26400)
 402                         f->frequency = 26400;
 403         } else
 404                 return -EINVAL;
 405         cadet_setfreq(dev, f->frequency);
 406         return 0;
 407 }
 408
 409 static int cadet_s_ctrl(struct v4l2_ctrl *ctrl)
 410 {
 411         struct cadet *dev = container_of(ctrl->handler, struct cadet, ctrl_handler);
 412
 413         switch (ctrl->id) {
 414         case V4L2_CID_AUDIO_MUTE:
 415                 outb(7, dev->io);                /* Select tuner control */
 416                 if (ctrl->val)
 417                         outb(0x00, dev->io + 1);
 418                 else
 419                         outb(0x20, dev->io + 1);
 420                 return 0;
 421         }
 422         return -EINVAL;
 423 }
 424
 425 static int cadet_open(struct file *file)
 426 {
 427         struct cadet *dev = video_drvdata(file);
 428         int err;
 429
 430         mutex_lock(&dev->lock);
 431         err = v4l2_fh_open(file);
 432         if (err)
 433                 goto fail;
 434         if (v4l2_fh_is_singular_file(file))
 435                 init_waitqueue_head(&dev->read_queue);
 436 fail:
 437         mutex_unlock(&dev->lock);
 438         return err;
 439 }
 440
 441 static int cadet_release(struct file *file)
 442 {
 443         struct cadet *dev = video_drvdata(file);
 444
 445         mutex_lock(&dev->lock);
 446         if (v4l2_fh_is_singular_file(file) && dev->rdsstat) {
 447                 del_timer_sync(&dev->readtimer);
 448                 dev->rdsstat = 0;
 449         }
 450         v4l2_fh_release(file);
 451         mutex_unlock(&dev->lock);
 452         return 0;
 453 }
 454
 455 static unsigned int cadet_poll(struct file *file, struct poll_table_struct *wait)
 456 {
 457         struct cadet *dev = video_drvdata(file);
 458         unsigned int res = v4l2_ctrl_poll(file, wait);
 459
 460         poll_wait(file, &dev->read_queue, wait);
 461         if (dev->rdsin != dev->rdsout)
 462                 res |= POLLIN | POLLRDNORM;
 463         return res;
 464 }
 465
 466
 467 static const struct v4l2_file_operations cadet_fops = {
 468         .owner          = THIS_MODULE,
 469         .open           = cadet_open,
 470         .release        = cadet_release,
 471         .read           = cadet_read,
 472         .unlocked_ioctl = video_ioctl2,
 473         .poll           = cadet_poll,
 474 };
 475
 476 static const struct v4l2_ioctl_ops cadet_ioctl_ops = {
 477         .vidioc_querycap    = vidioc_querycap,
 478         .vidioc_g_tuner     = vidioc_g_tuner,
 479         .vidioc_s_tuner     = vidioc_s_tuner,
 480         .vidioc_g_frequency = vidioc_g_frequency,
 481         .vidioc_s_frequency = vidioc_s_frequency,
 482         .vidioc_log_status  = v4l2_ctrl_log_status,
 483         .vidioc_subscribe_event = v4l2_ctrl_subscribe_event,
 484         .vidioc_unsubscribe_event = v4l2_event_unsubscribe,
 485 };
 486
 487 static const struct v4l2_ctrl_ops cadet_ctrl_ops = {
 488         .s_ctrl = cadet_s_ctrl,
 489 };
 490
 491 #ifdef CONFIG_PNP
 492
 493 static struct pnp_device_id cadet_pnp_devices[] = {
 494         /* ADS Cadet AM/FM Radio Card */
 495         {.id = "MSM0c24", .driver_data = 0},
 496         {.id = ""}
 497 };
 498
 499 MODULE_DEVICE_TABLE(pnp, cadet_pnp_devices);
 500
 501 static int cadet_pnp_probe(struct pnp_dev *dev, const struct pnp_device_id *dev_id)
 502 {
 503         if (!dev)
 504                 return -ENODEV;
 505         /* only support one device */
 506         if (io > 0)
 507                 return -EBUSY;
 508
 509         if (!pnp_port_valid(dev, 0))
 510                 return -ENODEV;
 511
 512         io = pnp_port_start(dev, 0);
 513
 514         printk(KERN_INFO "radio-cadet: PnP reports device at %#x\n", io);
 515
 516         return io;
 517 }
 518
 519 static struct pnp_driver cadet_pnp_driver = {
 520         .name           = "radio-cadet",
 521         .id_table       = cadet_pnp_devices,
 522         .probe          = cadet_pnp_probe,
 523         .remove         = NULL,
 524 };
 525
 526 #else
 527 static struct pnp_driver cadet_pnp_driver;
 528 #endif
 529
 530 static void cadet_probe(struct cadet *dev)
 531 {
 532         static int iovals[8] = { 0x330, 0x332, 0x334, 0x336, 0x338, 0x33a, 0x33c, 0x33e };
 533         int i;
 534
 535         for (i = 0; i < 8; i++) {
 536                 dev->io = iovals[i];
 537                 if (request_region(dev->io, 2, "cadet-probe")) {
 538                         cadet_setfreq(dev, 1410);
 539                         if (cadet_getfreq(dev) == 1410) {
 540                                 release_region(dev->io, 2);
 541                                 return;
 542                         }
 543                         release_region(dev->io, 2);
 544                 }
 545         }
 546         dev->io = -1;
 547 }
 548
 549 /*
 550  * io should only be set if the user has used something like
 551  * isapnp (the userspace program) to initialize this card for us
 552  */
 553
 554 static int __init cadet_init(void)
 555 {
 556         struct cadet *dev = &cadet_card;
 557         struct v4l2_device *v4l2_dev = &dev->v4l2_dev;
 558         struct v4l2_ctrl_handler *hdl;
 559         int res = -ENODEV;
 560
 561         strlcpy(v4l2_dev->name, "cadet", sizeof(v4l2_dev->name));
 562         mutex_init(&dev->lock);
 563
 564         /* If a probe was requested then probe ISAPnP first (safest) */
 565         if (io < 0)
 566                 pnp_register_driver(&cadet_pnp_driver);
 567         dev->io = io;
 568
 569         /* If that fails then probe unsafely if probe is requested */
 570         if (dev->io < 0)
 571                 cadet_probe(dev);
 572
 573         /* Else we bail out */
 574         if (dev->io < 0) {
 575 #ifdef MODULE
 576                 v4l2_err(v4l2_dev, "you must set an I/O address with io=0x330, 0x332, 0x334,\n");
 577                 v4l2_err(v4l2_dev, "0x336, 0x338, 0x33a, 0x33c or 0x33e\n");
 578 #endif
 579                 goto fail;
 580         }
 581         if (!request_region(dev->io, 2, "cadet"))
 582                 goto fail;
 583
 584         res = v4l2_device_register(NULL, v4l2_dev);
 585         if (res < 0) {
 586                 release_region(dev->io, 2);
 587                 v4l2_err(v4l2_dev, "could not register v4l2_device\n");
 588                 goto fail;
 589         }
 590
 591         hdl = &dev->ctrl_handler;
 592         v4l2_ctrl_handler_init(hdl, 2);
 593         v4l2_ctrl_new_std(hdl, &cadet_ctrl_ops,
 594                         V4L2_CID_AUDIO_MUTE, 0, 1, 1, 1);
 595         v4l2_dev->ctrl_handler = hdl;
 596         if (hdl->error) {
 597                 res = hdl->error;
 598                 v4l2_err(v4l2_dev, "Could not register controls\n");
 599                 goto err_hdl;
 600         }
 601
 602         strlcpy(dev->vdev.name, v4l2_dev->name, sizeof(dev->vdev.name));
 603         dev->vdev.v4l2_dev = v4l2_dev;
 604         dev->vdev.fops = &cadet_fops;
 605         dev->vdev.ioctl_ops = &cadet_ioctl_ops;
 606         dev->vdev.release = video_device_release_empty;
 607         dev->vdev.lock = &dev->lock;
 608         set_bit(V4L2_FL_USE_FH_PRIO, &dev->vdev.flags);
 609         video_set_drvdata(&dev->vdev, dev);
 610
 611         if (video_register_device(&dev->vdev, VFL_TYPE_RADIO, radio_nr) < 0)
 612                 goto err_hdl;
 613         v4l2_info(v4l2_dev, "ADS Cadet Radio Card at 0x%x\n", dev->io);
 614         return 0;
 615 err_hdl:
 616         v4l2_ctrl_handler_free(hdl);
 617         v4l2_device_unregister(v4l2_dev);
 618         release_region(dev->io, 2);
 619 fail:
 620         pnp_unregister_driver(&cadet_pnp_driver);
 621         return res;
 622 }
 623
 624 static void __exit cadet_exit(void)
 625 {
 626         struct cadet *dev = &cadet_card;
 627
 628         video_unregister_device(&dev->vdev);
 629         v4l2_ctrl_handler_free(&dev->ctrl_handler);
 630         v4l2_device_unregister(&dev->v4l2_dev);
 631         release_region(dev->io, 2);
 632         pnp_unregister_driver(&cadet_pnp_driver);
 633 }
 634
 635 module_init(cadet_init);
 636 module_exit(cadet_exit);
 637