drivers/staging/comedi/drivers/skel.c

   1 /*
   2     comedi/drivers/skel.c
   3     Skeleton code for a Comedi driver
   4
   5     COMEDI - Linux Control and Measurement Device Interface
   6     Copyright (C) 2000 David A. Schleef <ds@schleef.org>
   7
   8     This program is free software; you can redistribute it and/or modify
   9     it under the terms of the GNU General Public License as published by
  10     the Free Software Foundation; either version 2 of the License, or
  11     (at your option) any later version.
  12
  13     This program is distributed in the hope that it will be useful,
  14     but WITHOUT ANY WARRANTY; without even the implied warranty of
  15     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16     GNU General Public License for more details.
  17
  18     You should have received a copy of the GNU General Public License
  19     along with this program; if not, write to the Free Software
  20     Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  21
  22 */
  23 /*
  24 Driver: skel
  25 Description: Skeleton driver, an example for driver writers
  26 Devices:
  27 Author: ds
  28 Updated: Mon, 18 Mar 2002 15:34:01 -0800
  29 Status: works
  30
  31 This driver is a documented example on how Comedi drivers are
  32 written.
  33
  34 Configuration Options:
  35   none
  36 */
  37
  38 /*
  39  * The previous block comment is used to automatically generate
  40  * documentation in Comedi and Comedilib.  The fields:
  41  *
  42  *  Driver: the name of the driver
  43  *  Description: a short phrase describing the driver.  Don't list boards.
  44  *  Devices: a full list of the boards that attempt to be supported by
  45  *    the driver.  Format is "(manufacturer) board name [comedi name]",
  46  *    where comedi_name is the name that is used to configure the board.
  47  *    See the comment near board_name: in the struct comedi_driver structure
  48  *    below.  If (manufacturer) or [comedi name] is missing, the previous
  49  *    value is used.
  50  *  Author: you
  51  *  Updated: date when the _documentation_ was last updated.  Use 'date -R'
  52  *    to get a value for this.
  53  *  Status: a one-word description of the status.  Valid values are:
  54  *    works - driver works correctly on most boards supported, and
  55  *      passes comedi_test.
  56  *    unknown - unknown.  Usually put there by ds.
  57  *    experimental - may not work in any particular release.  Author
  58  *      probably wants assistance testing it.
  59  *    bitrotten - driver has not been update in a long time, probably
  60  *      doesn't work, and probably is missing support for significant
  61  *      Comedi interface features.
  62  *    untested - author probably wrote it "blind", and is believed to
  63  *      work, but no confirmation.
  64  *
  65  * These headers should be followed by a blank line, and any comments
  66  * you wish to say about the driver.  The comment area is the place
  67  * to put any known bugs, limitations, unsupported features, supported
  68  * command triggers, whether or not commands are supported on particular
  69  * subdevices, etc.
  70  *
  71  * Somewhere in the comment should be information about configuration
  72  * options that are used with comedi_config.
  73  */
  74
  75 #include "../comedidev.h"
  76
  77 #include <linux/pci.h>          /* for PCI devices */
  78
  79 #include "comedi_fc.h"
  80
  81 /* Imaginary registers for the imaginary board */
  82
  83 #define SKEL_SIZE 0
  84
  85 #define SKEL_START_AI_CONV      0
  86 #define SKEL_AI_READ            0
  87
  88 /*
  89  * Board descriptions for two imaginary boards.  Describing the
  90  * boards in this way is optional, and completely driver-dependent.
  91  * Some drivers use arrays such as this, other do not.
  92  */
  93 struct skel_board {
  94         const char *name;
  95         int ai_chans;
  96         int ai_bits;
  97         int have_dio;
  98 };
  99
 100 static const struct skel_board skel_boards[] = {
 101         {
 102          .name = "skel-100",
 103          .ai_chans = 16,
 104          .ai_bits = 12,
 105          .have_dio = 1,
 106          },
 107         {
 108          .name = "skel-200",
 109          .ai_chans = 8,
 110          .ai_bits = 16,
 111          .have_dio = 0,
 112          },
 113 };
 114
 115 /* This is used by modprobe to translate PCI IDs to drivers.  Should
 116  * only be used for PCI and ISA-PnP devices */
 117 /* Please add your PCI vendor ID to comedidev.h, and it will be forwarded
 118  * upstream. */
 119 #define PCI_VENDOR_ID_SKEL 0xdafe
 120 static DEFINE_PCI_DEVICE_TABLE(skel_pci_table) = {
 121         { PCI_DEVICE(PCI_VENDOR_ID_SKEL, 0x0100) },
 122         { PCI_DEVICE(PCI_VENDOR_ID_SKEL, 0x0200) },
 123         { 0 }
 124 };
 125
 126 MODULE_DEVICE_TABLE(pci, skel_pci_table);
 127
 128 /*
 129  * Useful for shorthand access to the particular board structure
 130  */
 131 #define thisboard ((const struct skel_board *)dev->board_ptr)
 132
 133 /* this structure is for data unique to this hardware driver.  If
 134    several hardware drivers keep similar information in this structure,
 135    feel free to suggest moving the variable to the struct comedi_device struct.
 136  */
 137 struct skel_private {
 138
 139         int data;
 140
 141         /* would be useful for a PCI device */
 142         struct pci_dev *pci_dev;
 143
 144         /* Used for AO readback */
 145         unsigned int ao_readback[2];
 146 };
 147
 148 /*
 149  * most drivers define the following macro to make it easy to
 150  * access the private structure.
 151  */
 152 #define devpriv ((struct skel_private *)dev->private)
 153
 154 /*
 155  * The struct comedi_driver structure tells the Comedi core module
 156  * which functions to call to configure/deconfigure (attach/detach)
 157  * the board, and also about the kernel module that contains
 158  * the device code.
 159  */
 160 static int skel_attach(struct comedi_device *dev, struct comedi_devconfig *it);
 161 static void skel_detach(struct comedi_device *dev);
 162 static struct comedi_driver driver_skel = {
 163         .driver_name = "dummy",
 164         .module = THIS_MODULE,
 165         .attach = skel_attach,
 166         .detach = skel_detach,
 167 /* It is not necessary to implement the following members if you are
 168  * writing a driver for a ISA PnP or PCI card */
 169         /* Most drivers will support multiple types of boards by
 170          * having an array of board structures.  These were defined
 171          * in skel_boards[] above.  Note that the element 'name'
 172          * was first in the structure -- Comedi uses this fact to
 173          * extract the name of the board without knowing any details
 174          * about the structure except for its length.
 175          * When a device is attached (by comedi_config), the name
 176          * of the device is given to Comedi, and Comedi tries to
 177          * match it by going through the list of board names.  If
 178          * there is a match, the address of the pointer is put
 179          * into dev->board_ptr and driver->attach() is called.
 180          *
 181          * Note that these are not necessary if you can determine
 182          * the type of board in software.  ISA PnP, PCI, and PCMCIA
 183          * devices are such boards.
 184          */
 185         .board_name = &skel_boards[0].name,
 186         .offset = sizeof(struct skel_board),
 187         .num_names = ARRAY_SIZE(skel_boards),
 188 };
 189
 190 static int skel_ai_rinsn(struct comedi_device *dev, struct comedi_subdevice *s,
 191                          struct comedi_insn *insn, unsigned int *data);
 192 static int skel_ao_winsn(struct comedi_device *dev, struct comedi_subdevice *s,
 193                          struct comedi_insn *insn, unsigned int *data);
 194 static int skel_ao_rinsn(struct comedi_device *dev, struct comedi_subdevice *s,
 195                          struct comedi_insn *insn, unsigned int *data);
 196 static int skel_dio_insn_bits(struct comedi_device *dev,
 197                               struct comedi_subdevice *s,
 198                               struct comedi_insn *insn, unsigned int *data);
 199 static int skel_dio_insn_config(struct comedi_device *dev,
 200                                 struct comedi_subdevice *s,
 201                                 struct comedi_insn *insn, unsigned int *data);
 202 static int skel_ai_cmdtest(struct comedi_device *dev,
 203                            struct comedi_subdevice *s, struct comedi_cmd *cmd);
 204 static int skel_ns_to_timer(unsigned int *ns, int round);
 205
 206 /*
 207  * Attach is called by the Comedi core to configure the driver
 208  * for a particular board.  If you specified a board_name array
 209  * in the driver structure, dev->board_ptr contains that
 210  * address.
 211  */
 212 static int skel_attach(struct comedi_device *dev, struct comedi_devconfig *it)
 213 {
 214         struct comedi_subdevice *s;
 215         int ret;
 216
 217         pr_info("comedi%d: skel: ", dev->minor);
 218
 219 /*
 220  * If you can probe the device to determine what device in a series
 221  * it is, this is the place to do it.  Otherwise, dev->board_ptr
 222  * should already be initialized.
 223  */
 224         /* dev->board_ptr = skel_probe(dev, it); */
 225
 226 /*
 227  * Initialize dev->board_name.  Note that we can use the "thisboard"
 228  * macro now, since we just initialized it in the last line.
 229  */
 230         dev->board_name = thisboard->name;
 231
 232 /*
 233  * Allocate the private structure area.  alloc_private() is a
 234  * convenient macro defined in comedidev.h.
 235  */
 236         if (alloc_private(dev, sizeof(struct skel_private)) < 0)
 237                 return -ENOMEM;
 238
 239         ret = comedi_alloc_subdevices(dev, 3);
 240         if (ret)
 241                 return ret;
 242
 243         s = &dev->subdevices[0];
 244         /* dev->read_subdev=s; */
 245         /* analog input subdevice */
 246         s->type = COMEDI_SUBD_AI;
 247         /* we support single-ended (ground) and differential */
 248         s->subdev_flags = SDF_READABLE | SDF_GROUND | SDF_DIFF;
 249         s->n_chan = thisboard->ai_chans;
 250         s->maxdata = (1 << thisboard->ai_bits) - 1;
 251         s->range_table = &range_bipolar10;
 252         s->len_chanlist = 16;   /* This is the maximum chanlist length that
 253                                    the board can handle */
 254         s->insn_read = skel_ai_rinsn;
 255 /*
 256 *       s->subdev_flags |= SDF_CMD_READ;
 257 *       s->do_cmd = skel_ai_cmd;
 258 */
 259         s->do_cmdtest = skel_ai_cmdtest;
 260
 261         s = &dev->subdevices[1];
 262         /* analog output subdevice */
 263         s->type = COMEDI_SUBD_AO;
 264         s->subdev_flags = SDF_WRITABLE;
 265         s->n_chan = 1;
 266         s->maxdata = 0xffff;
 267         s->range_table = &range_bipolar5;
 268         s->insn_write = skel_ao_winsn;
 269         s->insn_read = skel_ao_rinsn;
 270
 271         s = &dev->subdevices[2];
 272         /* digital i/o subdevice */
 273         if (thisboard->have_dio) {
 274                 s->type = COMEDI_SUBD_DIO;
 275                 s->subdev_flags = SDF_READABLE | SDF_WRITABLE;
 276                 s->n_chan = 16;
 277                 s->maxdata = 1;
 278                 s->range_table = &range_digital;
 279                 s->insn_bits = skel_dio_insn_bits;
 280                 s->insn_config = skel_dio_insn_config;
 281         } else {
 282                 s->type = COMEDI_SUBD_UNUSED;
 283         }
 284
 285         pr_info("attached\n");
 286
 287         return 0;
 288 }
 289
 290 /*
 291  * _detach is called to deconfigure a device.  It should deallocate
 292  * resources.
 293  * This function is also called when _attach() fails, so it should be
 294  * careful not to release resources that were not necessarily
 295  * allocated by _attach().  dev->private and dev->subdevices are
 296  * deallocated automatically by the core.
 297  */
 298 static void skel_detach(struct comedi_device *dev)
 299 {
 300 }
 301
 302 /*
 303  * "instructions" read/write data in "one-shot" or "software-triggered"
 304  * mode.
 305  */
 306 static int skel_ai_rinsn(struct comedi_device *dev, struct comedi_subdevice *s,
 307                          struct comedi_insn *insn, unsigned int *data)
 308 {
 309         int n, i;
 310         unsigned int d;
 311         unsigned int status;
 312
 313         /* a typical programming sequence */
 314
 315         /* write channel to multiplexer */
 316         /* outw(chan,dev->iobase + SKEL_MUX); */
 317
 318         /* don't wait for mux to settle */
 319
 320         /* convert n samples */
 321         for (n = 0; n < insn->n; n++) {
 322                 /* trigger conversion */
 323                 /* outw(0,dev->iobase + SKEL_CONVERT); */
 324
 325 #define TIMEOUT 100
 326                 /* wait for conversion to end */
 327                 for (i = 0; i < TIMEOUT; i++) {
 328                         status = 1;
 329                         /* status = inb(dev->iobase + SKEL_STATUS); */
 330                         if (status)
 331                                 break;
 332                 }
 333                 if (i == TIMEOUT) {
 334                         /* printk() should be used instead of printk()
 335                          * whenever the code can be called from real-time. */
 336                         pr_info("timeout\n");
 337                         return -ETIMEDOUT;
 338                 }
 339
 340                 /* read data */
 341                 /* d = inw(dev->iobase + SKEL_AI_DATA); */
 342                 d = 0;
 343
 344                 /* mangle the data as necessary */
 345                 d ^= 1 << (thisboard->ai_bits - 1);
 346
 347                 data[n] = d;
 348         }
 349
 350         /* return the number of samples read/written */
 351         return n;
 352 }
 353
 354 /*
 355  * cmdtest tests a particular command to see if it is valid.
 356  * Using the cmdtest ioctl, a user can create a valid cmd
 357  * and then have it executes by the cmd ioctl.
 358  *
 359  * cmdtest returns 1,2,3,4 or 0, depending on which tests
 360  * the command passes.
 361  */
 362 static int skel_ai_cmdtest(struct comedi_device *dev,
 363                            struct comedi_subdevice *s,
 364                            struct comedi_cmd *cmd)
 365 {
 366         int err = 0;
 367         int tmp;
 368
 369         /* Step 1 : check if triggers are trivially valid */
 370
 371         err |= cfc_check_trigger_src(&cmd->start_src, TRIG_NOW);
 372         err |= cfc_check_trigger_src(&cmd->scan_begin_src,
 373                                         TRIG_TIMER | TRIG_EXT);
 374         err |= cfc_check_trigger_src(&cmd->convert_src, TRIG_TIMER | TRIG_EXT);
 375         err |= cfc_check_trigger_src(&cmd->scan_end_src, TRIG_COUNT);
 376         err |= cfc_check_trigger_src(&cmd->stop_src, TRIG_COUNT | TRIG_NONE);
 377
 378         if (err)
 379                 return 1;
 380
 381         /* Step 2a : make sure trigger sources are unique */
 382
 383         err |= cfc_check_trigger_is_unique(cmd->scan_begin_src);
 384         err |= cfc_check_trigger_is_unique(cmd->convert_src);
 385         err |= cfc_check_trigger_is_unique(cmd->stop_src);
 386
 387         /* Step 2b : and mutually compatible */
 388
 389         if (err)
 390                 return 2;
 391
 392         /* step 3: make sure arguments are trivially compatible */
 393
 394         if (cmd->start_arg != 0) {
 395                 cmd->start_arg = 0;
 396                 err++;
 397         }
 398 #define MAX_SPEED       10000   /* in nanoseconds */
 399 #define MIN_SPEED       1000000000      /* in nanoseconds */
 400
 401         if (cmd->scan_begin_src == TRIG_TIMER) {
 402                 if (cmd->scan_begin_arg < MAX_SPEED) {
 403                         cmd->scan_begin_arg = MAX_SPEED;
 404                         err++;
 405                 }
 406                 if (cmd->scan_begin_arg > MIN_SPEED) {
 407                         cmd->scan_begin_arg = MIN_SPEED;
 408                         err++;
 409                 }
 410         } else {
 411                 /* external trigger */
 412                 /* should be level/edge, hi/lo specification here */
 413                 /* should specify multiple external triggers */
 414                 if (cmd->scan_begin_arg > 9) {
 415                         cmd->scan_begin_arg = 9;
 416                         err++;
 417                 }
 418         }
 419         if (cmd->convert_src == TRIG_TIMER) {
 420                 if (cmd->convert_arg < MAX_SPEED) {
 421                         cmd->convert_arg = MAX_SPEED;
 422                         err++;
 423                 }
 424                 if (cmd->convert_arg > MIN_SPEED) {
 425                         cmd->convert_arg = MIN_SPEED;
 426                         err++;
 427                 }
 428         } else {
 429                 /* external trigger */
 430                 /* see above */
 431                 if (cmd->convert_arg > 9) {
 432                         cmd->convert_arg = 9;
 433                         err++;
 434                 }
 435         }
 436
 437         if (cmd->scan_end_arg != cmd->chanlist_len) {
 438                 cmd->scan_end_arg = cmd->chanlist_len;
 439                 err++;
 440         }
 441         if (cmd->stop_src == TRIG_COUNT) {
 442                 if (cmd->stop_arg > 0x00ffffff) {
 443                         cmd->stop_arg = 0x00ffffff;
 444                         err++;
 445                 }
 446         } else {
 447                 /* TRIG_NONE */
 448                 if (cmd->stop_arg != 0) {
 449                         cmd->stop_arg = 0;
 450                         err++;
 451                 }
 452         }
 453
 454         if (err)
 455                 return 3;
 456
 457         /* step 4: fix up any arguments */
 458
 459         if (cmd->scan_begin_src == TRIG_TIMER) {
 460                 tmp = cmd->scan_begin_arg;
 461                 skel_ns_to_timer(&cmd->scan_begin_arg,
 462                                  cmd->flags & TRIG_ROUND_MASK);
 463                 if (tmp != cmd->scan_begin_arg)
 464                         err++;
 465         }
 466         if (cmd->convert_src == TRIG_TIMER) {
 467                 tmp = cmd->convert_arg;
 468                 skel_ns_to_timer(&cmd->convert_arg,
 469                                  cmd->flags & TRIG_ROUND_MASK);
 470                 if (tmp != cmd->convert_arg)
 471                         err++;
 472                 if (cmd->scan_begin_src == TRIG_TIMER &&
 473                     cmd->scan_begin_arg <
 474                     cmd->convert_arg * cmd->scan_end_arg) {
 475                         cmd->scan_begin_arg =
 476                             cmd->convert_arg * cmd->scan_end_arg;
 477                         err++;
 478                 }
 479         }
 480
 481         if (err)
 482                 return 4;
 483
 484         return 0;
 485 }
 486
 487 /* This function doesn't require a particular form, this is just
 488  * what happens to be used in some of the drivers.  It should
 489  * convert ns nanoseconds to a counter value suitable for programming
 490  * the device.  Also, it should adjust ns so that it cooresponds to
 491  * the actual time that the device will use. */
 492 static int skel_ns_to_timer(unsigned int *ns, int round)
 493 {
 494         /* trivial timer */
 495         /* if your timing is done through two cascaded timers, the
 496          * i8253_cascade_ns_to_timer() function in 8253.h can be
 497          * very helpful.  There are also i8254_load() and i8254_mm_load()
 498          * which can be used to load values into the ubiquitous 8254 counters
 499          */
 500
 501         return *ns;
 502 }
 503
 504 static int skel_ao_winsn(struct comedi_device *dev, struct comedi_subdevice *s,
 505                          struct comedi_insn *insn, unsigned int *data)
 506 {
 507         int i;
 508         int chan = CR_CHAN(insn->chanspec);
 509
 510         pr_info("skel_ao_winsn\n");
 511         /* Writing a list of values to an AO channel is probably not
 512          * very useful, but that's how the interface is defined. */
 513         for (i = 0; i < insn->n; i++) {
 514                 /* a typical programming sequence */
 515                 /* outw(data[i],dev->iobase + SKEL_DA0 + chan); */
 516                 devpriv->ao_readback[chan] = data[i];
 517         }
 518
 519         /* return the number of samples read/written */
 520         return i;
 521 }
 522
 523 /* AO subdevices should have a read insn as well as a write insn.
 524  * Usually this means copying a value stored in devpriv. */
 525 static int skel_ao_rinsn(struct comedi_device *dev, struct comedi_subdevice *s,
 526                          struct comedi_insn *insn, unsigned int *data)
 527 {
 528         int i;
 529         int chan = CR_CHAN(insn->chanspec);
 530
 531         for (i = 0; i < insn->n; i++)
 532                 data[i] = devpriv->ao_readback[chan];
 533
 534         return i;
 535 }
 536
 537 /* DIO devices are slightly special.  Although it is possible to
 538  * implement the insn_read/insn_write interface, it is much more
 539  * useful to applications if you implement the insn_bits interface.
 540  * This allows packed reading/writing of the DIO channels.  The
 541  * comedi core can convert between insn_bits and insn_read/write */
 542 static int skel_dio_insn_bits(struct comedi_device *dev,
 543                               struct comedi_subdevice *s,
 544                               struct comedi_insn *insn, unsigned int *data)
 545 {
 546         /* The insn data is a mask in data[0] and the new data
 547          * in data[1], each channel cooresponding to a bit. */
 548         if (data[0]) {
 549                 s->state &= ~data[0];
 550                 s->state |= data[0] & data[1];
 551                 /* Write out the new digital output lines */
 552                 /* outw(s->state,dev->iobase + SKEL_DIO); */
 553         }
 554
 555         /* on return, data[1] contains the value of the digital
 556          * input and output lines. */
 557         /* data[1]=inw(dev->iobase + SKEL_DIO); */
 558         /* or we could just return the software copy of the output values if
 559          * it was a purely digital output subdevice */
 560         /* data[1]=s->state; */
 561
 562         return insn->n;
 563 }
 564
 565 static int skel_dio_insn_config(struct comedi_device *dev,
 566                                 struct comedi_subdevice *s,
 567                                 struct comedi_insn *insn, unsigned int *data)
 568 {
 569         int chan = CR_CHAN(insn->chanspec);
 570
 571         /* The input or output configuration of each digital line is
 572          * configured by a special insn_config instruction.  chanspec
 573          * contains the channel to be changed, and data[0] contains the
 574          * value COMEDI_INPUT or COMEDI_OUTPUT. */
 575         switch (data[0]) {
 576         case INSN_CONFIG_DIO_OUTPUT:
 577                 s->io_bits |= 1 << chan;
 578                 break;
 579         case INSN_CONFIG_DIO_INPUT:
 580                 s->io_bits &= ~(1 << chan);
 581                 break;
 582         case INSN_CONFIG_DIO_QUERY:
 583                 data[1] =
 584                     (s->io_bits & (1 << chan)) ? COMEDI_OUTPUT : COMEDI_INPUT;
 585                 return insn->n;
 586                 break;
 587         default:
 588                 return -EINVAL;
 589                 break;
 590         }
 591         /* outw(s->io_bits,dev->iobase + SKEL_DIO_CONFIG); */
 592
 593         return insn->n;
 594 }
 595
 596 #ifdef CONFIG_COMEDI_PCI_DRIVERS
 597 static int __devinit driver_skel_pci_probe(struct pci_dev *dev,
 598                                            const struct pci_device_id *ent)
 599 {
 600         return comedi_pci_auto_config(dev, &driver_skel);
 601 }
 602
 603 static void __devexit driver_skel_pci_remove(struct pci_dev *dev)
 604 {
 605         comedi_pci_auto_unconfig(dev);
 606 }
 607
 608 static struct pci_driver driver_skel_pci_driver = {
 609         .id_table = skel_pci_table,
 610         .probe = &driver_skel_pci_probe,
 611         .remove = __devexit_p(&driver_skel_pci_remove)
 612 };
 613
 614 static int __init driver_skel_init_module(void)
 615 {
 616         int retval;
 617
 618         retval = comedi_driver_register(&driver_skel);
 619         if (retval < 0)
 620                 return retval;
 621
 622         driver_skel_pci_driver.name = (char *)driver_skel.driver_name;
 623         return pci_register_driver(&driver_skel_pci_driver);
 624 }
 625
 626 static void __exit driver_skel_cleanup_module(void)
 627 {
 628         pci_unregister_driver(&driver_skel_pci_driver);
 629         comedi_driver_unregister(&driver_skel);
 630 }
 631
 632 module_init(driver_skel_init_module);
 633 module_exit(driver_skel_cleanup_module);
 634 #else
 635 static int __init driver_skel_init_module(void)
 636 {
 637         return comedi_driver_register(&driver_skel);
 638 }
 639
 640 static void __exit driver_skel_cleanup_module(void)
 641 {
 642         comedi_driver_unregister(&driver_skel);
 643 }
 644
 645 module_init(driver_skel_init_module);
 646 module_exit(driver_skel_cleanup_module);
 647 #endif
 648
 649 MODULE_AUTHOR("Comedi http://www.comedi.org");
 650 MODULE_DESCRIPTION("Comedi low-level driver");
 651 MODULE_LICENSE("GPL");