drivers/staging/comedi/drivers/dt2801.c

   1 /*
   2  * comedi/drivers/dt2801.c
   3  * Device Driver for DataTranslation DT2801
   4  *
   5  */
   6 /*
   7 Driver: dt2801
   8 Description: Data Translation DT2801 series and DT01-EZ
   9 Author: ds
  10 Status: works
  11 Devices: [Data Translation] DT2801 (dt2801), DT2801-A, DT2801/5716A,
  12   DT2805, DT2805/5716A, DT2808, DT2818, DT2809, DT01-EZ
  13
  14 This driver can autoprobe the type of board.
  15
  16 Configuration options:
  17   [0] - I/O port base address
  18   [1] - unused
  19   [2] - A/D reference 0=differential, 1=single-ended
  20   [3] - A/D range
  21           0 = [-10, 10]
  22           1 = [0,10]
  23   [4] - D/A 0 range
  24           0 = [-10, 10]
  25           1 = [-5,5]
  26           2 = [-2.5,2.5]
  27           3 = [0,10]
  28           4 = [0,5]
  29   [5] - D/A 1 range (same choices)
  30 */
  31
  32 #include "../comedidev.h"
  33 #include <linux/delay.h>
  34 #include <linux/ioport.h>
  35
  36 #define DT2801_TIMEOUT 1000
  37
  38 /* Hardware Configuration */
  39 /* ====================== */
  40
  41 #define DT2801_MAX_DMA_SIZE (64 * 1024)
  42
  43 /* Ports */
  44 #define DT2801_IOSIZE 2
  45
  46 /* define's */
  47 /* ====================== */
  48
  49 /* Commands */
  50 #define DT_C_RESET       0x0
  51 #define DT_C_CLEAR_ERR   0x1
  52 #define DT_C_READ_ERRREG 0x2
  53 #define DT_C_SET_CLOCK   0x3
  54
  55 #define DT_C_TEST        0xb
  56 #define DT_C_STOP        0xf
  57
  58 #define DT_C_SET_DIGIN   0x4
  59 #define DT_C_SET_DIGOUT  0x5
  60 #define DT_C_READ_DIG    0x6
  61 #define DT_C_WRITE_DIG   0x7
  62
  63 #define DT_C_WRITE_DAIM  0x8
  64 #define DT_C_SET_DA      0x9
  65 #define DT_C_WRITE_DA    0xa
  66
  67 #define DT_C_READ_ADIM   0xc
  68 #define DT_C_SET_AD      0xd
  69 #define DT_C_READ_AD     0xe
  70
  71 /* Command modifiers (only used with read/write), EXTTRIG can be
  72    used with some other commands.
  73 */
  74 #define DT_MOD_DMA     (1<<4)
  75 #define DT_MOD_CONT    (1<<5)
  76 #define DT_MOD_EXTCLK  (1<<6)
  77 #define DT_MOD_EXTTRIG (1<<7)
  78
  79 /* Bits in status register */
  80 #define DT_S_DATA_OUT_READY   (1<<0)
  81 #define DT_S_DATA_IN_FULL     (1<<1)
  82 #define DT_S_READY            (1<<2)
  83 #define DT_S_COMMAND          (1<<3)
  84 #define DT_S_COMPOSITE_ERROR  (1<<7)
  85
  86 /* registers */
  87 #define DT2801_DATA             0
  88 #define DT2801_STATUS           1
  89 #define DT2801_CMD              1
  90
  91 #if 0
  92 /* ignore 'defined but not used' warning */
  93 static const struct comedi_lrange range_dt2801_ai_pgh_bipolar = { 4, {
  94                                                                       RANGE(-10,
  95                                                                             10),
  96                                                                       RANGE(-5,
  97                                                                             5),
  98                                                                       RANGE
  99                                                                       (-2.5,
 100                                                                        2.5),
 101                                                                       RANGE
 102                                                                       (-1.25,
 103                                                                        1.25),
 104                                                                       }
 105 };
 106 #endif
 107 static const struct comedi_lrange range_dt2801_ai_pgl_bipolar = { 4, {
 108                                                                       RANGE(-10,
 109                                                                             10),
 110                                                                       RANGE(-1,
 111                                                                             1),
 112                                                                       RANGE
 113                                                                       (-0.1,
 114                                                                        0.1),
 115                                                                       RANGE
 116                                                                       (-0.02,
 117                                                                        0.02),
 118                                                                       }
 119 };
 120
 121 #if 0
 122 /* ignore 'defined but not used' warning */
 123 static const struct comedi_lrange range_dt2801_ai_pgh_unipolar = { 4, {
 124                                                                        RANGE(0,
 125                                                                              10),
 126                                                                        RANGE(0,
 127                                                                              5),
 128                                                                        RANGE(0,
 129                                                                              2.5),
 130                                                                        RANGE(0,
 131                                                                              1.25),
 132                                                                        }
 133 };
 134 #endif
 135 static const struct comedi_lrange range_dt2801_ai_pgl_unipolar = { 4, {
 136                                                                        RANGE(0,
 137                                                                              10),
 138                                                                        RANGE(0,
 139                                                                              1),
 140                                                                        RANGE(0,
 141                                                                              0.1),
 142                                                                        RANGE(0,
 143                                                                              0.02),
 144                                                                        }
 145 };
 146
 147 struct dt2801_board {
 148
 149         const char *name;
 150         int boardcode;
 151         int ad_diff;
 152         int ad_chan;
 153         int adbits;
 154         int adrangetype;
 155         int dabits;
 156 };
 157
 158 /* Typeid's for the different boards of the DT2801-series
 159    (taken from the test-software, that comes with the board)
 160    */
 161 static const struct dt2801_board boardtypes[] = {
 162         {
 163          .name = "dt2801",
 164          .boardcode = 0x09,
 165          .ad_diff = 2,
 166          .ad_chan = 16,
 167          .adbits = 12,
 168          .adrangetype = 0,
 169          .dabits = 12},
 170         {
 171          .name = "dt2801-a",
 172          .boardcode = 0x52,
 173          .ad_diff = 2,
 174          .ad_chan = 16,
 175          .adbits = 12,
 176          .adrangetype = 0,
 177          .dabits = 12},
 178         {
 179          .name = "dt2801/5716a",
 180          .boardcode = 0x82,
 181          .ad_diff = 1,
 182          .ad_chan = 16,
 183          .adbits = 16,
 184          .adrangetype = 1,
 185          .dabits = 12},
 186         {
 187          .name = "dt2805",
 188          .boardcode = 0x12,
 189          .ad_diff = 1,
 190          .ad_chan = 16,
 191          .adbits = 12,
 192          .adrangetype = 0,
 193          .dabits = 12},
 194         {
 195          .name = "dt2805/5716a",
 196          .boardcode = 0x92,
 197          .ad_diff = 1,
 198          .ad_chan = 16,
 199          .adbits = 16,
 200          .adrangetype = 1,
 201          .dabits = 12},
 202         {
 203          .name = "dt2808",
 204          .boardcode = 0x20,
 205          .ad_diff = 0,
 206          .ad_chan = 16,
 207          .adbits = 12,
 208          .adrangetype = 2,
 209          .dabits = 8},
 210         {
 211          .name = "dt2818",
 212          .boardcode = 0xa2,
 213          .ad_diff = 0,
 214          .ad_chan = 4,
 215          .adbits = 12,
 216          .adrangetype = 0,
 217          .dabits = 12},
 218         {
 219          .name = "dt2809",
 220          .boardcode = 0xb0,
 221          .ad_diff = 0,
 222          .ad_chan = 8,
 223          .adbits = 12,
 224          .adrangetype = 1,
 225          .dabits = 12},
 226 };
 227
 228 #define boardtype (*(const struct dt2801_board *)dev->board_ptr)
 229
 230 struct dt2801_private {
 231
 232         const struct comedi_lrange *dac_range_types[2];
 233         unsigned int ao_readback[2];
 234 };
 235
 236 /* These are the low-level routines:
 237    writecommand: write a command to the board
 238    writedata: write data byte
 239    readdata: read data byte
 240  */
 241
 242 /* Only checks DataOutReady-flag, not the Ready-flag as it is done
 243    in the examples of the manual. I don't see why this should be
 244    necessary. */
 245 static int dt2801_readdata(struct comedi_device *dev, int *data)
 246 {
 247         int stat = 0;
 248         int timeout = DT2801_TIMEOUT;
 249
 250         do {
 251                 stat = inb_p(dev->iobase + DT2801_STATUS);
 252                 if (stat & (DT_S_COMPOSITE_ERROR | DT_S_READY))
 253                         return stat;
 254                 if (stat & DT_S_DATA_OUT_READY) {
 255                         *data = inb_p(dev->iobase + DT2801_DATA);
 256                         return 0;
 257                 }
 258         } while (--timeout > 0);
 259
 260         return -ETIME;
 261 }
 262
 263 static int dt2801_readdata2(struct comedi_device *dev, int *data)
 264 {
 265         int lb, hb;
 266         int ret;
 267
 268         ret = dt2801_readdata(dev, &lb);
 269         if (ret)
 270                 return ret;
 271         ret = dt2801_readdata(dev, &hb);
 272         if (ret)
 273                 return ret;
 274
 275         *data = (hb << 8) + lb;
 276         return 0;
 277 }
 278
 279 static int dt2801_writedata(struct comedi_device *dev, unsigned int data)
 280 {
 281         int stat = 0;
 282         int timeout = DT2801_TIMEOUT;
 283
 284         do {
 285                 stat = inb_p(dev->iobase + DT2801_STATUS);
 286
 287                 if (stat & DT_S_COMPOSITE_ERROR)
 288                         return stat;
 289                 if (!(stat & DT_S_DATA_IN_FULL)) {
 290                         outb_p(data & 0xff, dev->iobase + DT2801_DATA);
 291                         return 0;
 292                 }
 293 #if 0
 294                 if (stat & DT_S_READY) {
 295                         printk
 296                             ("dt2801: ready flag set (bad!) in dt2801_writedata()\n");
 297                         return -EIO;
 298                 }
 299 #endif
 300         } while (--timeout > 0);
 301
 302         return -ETIME;
 303 }
 304
 305 static int dt2801_writedata2(struct comedi_device *dev, unsigned int data)
 306 {
 307         int ret;
 308
 309         ret = dt2801_writedata(dev, data & 0xff);
 310         if (ret < 0)
 311                 return ret;
 312         ret = dt2801_writedata(dev, (data >> 8));
 313         if (ret < 0)
 314                 return ret;
 315
 316         return 0;
 317 }
 318
 319 static int dt2801_wait_for_ready(struct comedi_device *dev)
 320 {
 321         int timeout = DT2801_TIMEOUT;
 322         int stat;
 323
 324         stat = inb_p(dev->iobase + DT2801_STATUS);
 325         if (stat & DT_S_READY)
 326                 return 0;
 327         do {
 328                 stat = inb_p(dev->iobase + DT2801_STATUS);
 329
 330                 if (stat & DT_S_COMPOSITE_ERROR)
 331                         return stat;
 332                 if (stat & DT_S_READY)
 333                         return 0;
 334         } while (--timeout > 0);
 335
 336         return -ETIME;
 337 }
 338
 339 static int dt2801_writecmd(struct comedi_device *dev, int command)
 340 {
 341         int stat;
 342
 343         dt2801_wait_for_ready(dev);
 344
 345         stat = inb_p(dev->iobase + DT2801_STATUS);
 346         if (stat & DT_S_COMPOSITE_ERROR) {
 347                 printk
 348                     ("dt2801: composite-error in dt2801_writecmd(), ignoring\n");
 349         }
 350         if (!(stat & DT_S_READY))
 351                 printk("dt2801: !ready in dt2801_writecmd(), ignoring\n");
 352         outb_p(command, dev->iobase + DT2801_CMD);
 353
 354         return 0;
 355 }
 356
 357 static int dt2801_reset(struct comedi_device *dev)
 358 {
 359         int board_code = 0;
 360         unsigned int stat;
 361         int timeout;
 362
 363         DPRINTK("dt2801: resetting board...\n");
 364         DPRINTK("fingerprint: 0x%02x 0x%02x\n", inb_p(dev->iobase),
 365                 inb_p(dev->iobase + 1));
 366
 367         /* pull random data from data port */
 368         inb_p(dev->iobase + DT2801_DATA);
 369         inb_p(dev->iobase + DT2801_DATA);
 370         inb_p(dev->iobase + DT2801_DATA);
 371         inb_p(dev->iobase + DT2801_DATA);
 372
 373         DPRINTK("dt2801: stop\n");
 374         /* dt2801_writecmd(dev,DT_C_STOP); */
 375         outb_p(DT_C_STOP, dev->iobase + DT2801_CMD);
 376
 377         /* dt2801_wait_for_ready(dev); */
 378         udelay(100);
 379         timeout = 10000;
 380         do {
 381                 stat = inb_p(dev->iobase + DT2801_STATUS);
 382                 if (stat & DT_S_READY)
 383                         break;
 384         } while (timeout--);
 385         if (!timeout)
 386                 printk("dt2801: timeout 1 status=0x%02x\n", stat);
 387
 388         /* printk("dt2801: reading dummy\n"); */
 389         /* dt2801_readdata(dev,&board_code); */
 390
 391         DPRINTK("dt2801: reset\n");
 392         outb_p(DT_C_RESET, dev->iobase + DT2801_CMD);
 393         /* dt2801_writecmd(dev,DT_C_RESET); */
 394
 395         udelay(100);
 396         timeout = 10000;
 397         do {
 398                 stat = inb_p(dev->iobase + DT2801_STATUS);
 399                 if (stat & DT_S_READY)
 400                         break;
 401         } while (timeout--);
 402         if (!timeout)
 403                 printk("dt2801: timeout 2 status=0x%02x\n", stat);
 404
 405         DPRINTK("dt2801: reading code\n");
 406         dt2801_readdata(dev, &board_code);
 407
 408         DPRINTK("dt2801: ok.  code=0x%02x\n", board_code);
 409
 410         return board_code;
 411 }
 412
 413 static int probe_number_of_ai_chans(struct comedi_device *dev)
 414 {
 415         int n_chans;
 416         int stat;
 417         int data;
 418
 419         for (n_chans = 0; n_chans < 16; n_chans++) {
 420                 stat = dt2801_writecmd(dev, DT_C_READ_ADIM);
 421                 dt2801_writedata(dev, 0);
 422                 dt2801_writedata(dev, n_chans);
 423                 stat = dt2801_readdata2(dev, &data);
 424
 425                 if (stat)
 426                         break;
 427         }
 428
 429         dt2801_reset(dev);
 430         dt2801_reset(dev);
 431
 432         return n_chans;
 433 }
 434
 435 static const struct comedi_lrange *dac_range_table[] = {
 436         &range_bipolar10,
 437         &range_bipolar5,
 438         &range_bipolar2_5,
 439         &range_unipolar10,
 440         &range_unipolar5
 441 };
 442
 443 static const struct comedi_lrange *dac_range_lkup(int opt)
 444 {
 445         if (opt < 0 || opt >= 5)
 446                 return &range_unknown;
 447         return dac_range_table[opt];
 448 }
 449
 450 static const struct comedi_lrange *ai_range_lkup(int type, int opt)
 451 {
 452         switch (type) {
 453         case 0:
 454                 return (opt) ?
 455                     &range_dt2801_ai_pgl_unipolar :
 456                     &range_dt2801_ai_pgl_bipolar;
 457         case 1:
 458                 return (opt) ? &range_unipolar10 : &range_bipolar10;
 459         case 2:
 460                 return &range_unipolar5;
 461         }
 462         return &range_unknown;
 463 }
 464
 465 static int dt2801_error(struct comedi_device *dev, int stat)
 466 {
 467         if (stat < 0) {
 468                 if (stat == -ETIME)
 469                         printk("dt2801: timeout\n");
 470                 else
 471                         printk("dt2801: error %d\n", stat);
 472                 return stat;
 473         }
 474         printk("dt2801: error status 0x%02x, resetting...\n", stat);
 475
 476         dt2801_reset(dev);
 477         dt2801_reset(dev);
 478
 479         return -EIO;
 480 }
 481
 482 static int dt2801_ai_insn_read(struct comedi_device *dev,
 483                                struct comedi_subdevice *s,
 484                                struct comedi_insn *insn, unsigned int *data)
 485 {
 486         int d;
 487         int stat;
 488         int i;
 489
 490         for (i = 0; i < insn->n; i++) {
 491                 stat = dt2801_writecmd(dev, DT_C_READ_ADIM);
 492                 dt2801_writedata(dev, CR_RANGE(insn->chanspec));
 493                 dt2801_writedata(dev, CR_CHAN(insn->chanspec));
 494                 stat = dt2801_readdata2(dev, &d);
 495
 496                 if (stat != 0)
 497                         return dt2801_error(dev, stat);
 498
 499                 data[i] = d;
 500         }
 501
 502         return i;
 503 }
 504
 505 static int dt2801_ao_insn_read(struct comedi_device *dev,
 506                                struct comedi_subdevice *s,
 507                                struct comedi_insn *insn, unsigned int *data)
 508 {
 509         struct dt2801_private *devpriv = dev->private;
 510
 511         data[0] = devpriv->ao_readback[CR_CHAN(insn->chanspec)];
 512
 513         return 1;
 514 }
 515
 516 static int dt2801_ao_insn_write(struct comedi_device *dev,
 517                                 struct comedi_subdevice *s,
 518                                 struct comedi_insn *insn, unsigned int *data)
 519 {
 520         struct dt2801_private *devpriv = dev->private;
 521
 522         dt2801_writecmd(dev, DT_C_WRITE_DAIM);
 523         dt2801_writedata(dev, CR_CHAN(insn->chanspec));
 524         dt2801_writedata2(dev, data[0]);
 525
 526         devpriv->ao_readback[CR_CHAN(insn->chanspec)] = data[0];
 527
 528         return 1;
 529 }
 530
 531 static int dt2801_dio_insn_bits(struct comedi_device *dev,
 532                                 struct comedi_subdevice *s,
 533                                 struct comedi_insn *insn, unsigned int *data)
 534 {
 535         int which = 0;
 536
 537         if (s == &dev->subdevices[3])
 538                 which = 1;
 539
 540         if (data[0]) {
 541                 s->state &= ~data[0];
 542                 s->state |= (data[0] & data[1]);
 543                 dt2801_writecmd(dev, DT_C_WRITE_DIG);
 544                 dt2801_writedata(dev, which);
 545                 dt2801_writedata(dev, s->state);
 546         }
 547         dt2801_writecmd(dev, DT_C_READ_DIG);
 548         dt2801_writedata(dev, which);
 549         dt2801_readdata(dev, data + 1);
 550
 551         return insn->n;
 552 }
 553
 554 static int dt2801_dio_insn_config(struct comedi_device *dev,
 555                                   struct comedi_subdevice *s,
 556                                   struct comedi_insn *insn, unsigned int *data)
 557 {
 558         int which = 0;
 559
 560         if (s == &dev->subdevices[3])
 561                 which = 1;
 562
 563         /* configure */
 564         switch (data[0]) {
 565         case INSN_CONFIG_DIO_OUTPUT:
 566                 s->io_bits = 0xff;
 567                 dt2801_writecmd(dev, DT_C_SET_DIGOUT);
 568                 break;
 569         case INSN_CONFIG_DIO_INPUT:
 570                 s->io_bits = 0;
 571                 dt2801_writecmd(dev, DT_C_SET_DIGIN);
 572                 break;
 573         case INSN_CONFIG_DIO_QUERY:
 574                 data[1] = s->io_bits ? COMEDI_OUTPUT : COMEDI_INPUT;
 575                 return insn->n;
 576         default:
 577                 return -EINVAL;
 578         }
 579         dt2801_writedata(dev, which);
 580
 581         return 1;
 582 }
 583
 584 /*
 585    options:
 586         [0] - i/o base
 587         [1] - unused
 588         [2] - a/d 0=differential, 1=single-ended
 589         [3] - a/d range 0=[-10,10], 1=[0,10]
 590         [4] - dac0 range 0=[-10,10], 1=[-5,5], 2=[-2.5,2.5] 3=[0,10], 4=[0,5]
 591         [5] - dac1 range 0=[-10,10], 1=[-5,5], 2=[-2.5,2.5] 3=[0,10], 4=[0,5]
 592 */
 593 static int dt2801_attach(struct comedi_device *dev, struct comedi_devconfig *it)
 594 {
 595         struct dt2801_private *devpriv;
 596         struct comedi_subdevice *s;
 597         unsigned long iobase;
 598         int board_code, type;
 599         int ret = 0;
 600         int n_ai_chans;
 601
 602         iobase = it->options[0];
 603         if (!request_region(iobase, DT2801_IOSIZE, "dt2801")) {
 604                 comedi_error(dev, "I/O port conflict");
 605                 return -EIO;
 606         }
 607         dev->iobase = iobase;
 608
 609         /* do some checking */
 610
 611         board_code = dt2801_reset(dev);
 612
 613         /* heh.  if it didn't work, try it again. */
 614         if (!board_code)
 615                 board_code = dt2801_reset(dev);
 616
 617         for (type = 0; type < ARRAY_SIZE(boardtypes); type++) {
 618                 if (boardtypes[type].boardcode == board_code)
 619                         goto havetype;
 620         }
 621         printk("dt2801: unrecognized board code=0x%02x, contact author\n",
 622                board_code);
 623         type = 0;
 624
 625 havetype:
 626         dev->board_ptr = boardtypes + type;
 627         printk("dt2801: %s at port 0x%lx", boardtype.name, iobase);
 628
 629         n_ai_chans = probe_number_of_ai_chans(dev);
 630         printk(" (ai channels = %d)\n", n_ai_chans);
 631
 632         ret = comedi_alloc_subdevices(dev, 4);
 633         if (ret)
 634                 goto out;
 635
 636         devpriv = kzalloc(sizeof(*devpriv), GFP_KERNEL);
 637         if (!devpriv)
 638                 return -ENOMEM;
 639         dev->private = devpriv;
 640
 641         dev->board_name = boardtype.name;
 642
 643         s = &dev->subdevices[0];
 644         /* ai subdevice */
 645         s->type = COMEDI_SUBD_AI;
 646         s->subdev_flags = SDF_READABLE | SDF_GROUND;
 647 #if 1
 648         s->n_chan = n_ai_chans;
 649 #else
 650         if (it->options[2])
 651                 s->n_chan = boardtype.ad_chan;
 652         else
 653                 s->n_chan = boardtype.ad_chan / 2;
 654 #endif
 655         s->maxdata = (1 << boardtype.adbits) - 1;
 656         s->range_table = ai_range_lkup(boardtype.adrangetype, it->options[3]);
 657         s->insn_read = dt2801_ai_insn_read;
 658
 659         s = &dev->subdevices[1];
 660         /* ao subdevice */
 661         s->type = COMEDI_SUBD_AO;
 662         s->subdev_flags = SDF_WRITABLE;
 663         s->n_chan = 2;
 664         s->maxdata = (1 << boardtype.dabits) - 1;
 665         s->range_table_list = devpriv->dac_range_types;
 666         devpriv->dac_range_types[0] = dac_range_lkup(it->options[4]);
 667         devpriv->dac_range_types[1] = dac_range_lkup(it->options[5]);
 668         s->insn_read = dt2801_ao_insn_read;
 669         s->insn_write = dt2801_ao_insn_write;
 670
 671         s = &dev->subdevices[2];
 672         /* 1st digital subdevice */
 673         s->type = COMEDI_SUBD_DIO;
 674         s->subdev_flags = SDF_READABLE | SDF_WRITABLE;
 675         s->n_chan = 8;
 676         s->maxdata = 1;
 677         s->range_table = &range_digital;
 678         s->insn_bits = dt2801_dio_insn_bits;
 679         s->insn_config = dt2801_dio_insn_config;
 680
 681         s = &dev->subdevices[3];
 682         /* 2nd digital subdevice */
 683         s->type = COMEDI_SUBD_DIO;
 684         s->subdev_flags = SDF_READABLE | SDF_WRITABLE;
 685         s->n_chan = 8;
 686         s->maxdata = 1;
 687         s->range_table = &range_digital;
 688         s->insn_bits = dt2801_dio_insn_bits;
 689         s->insn_config = dt2801_dio_insn_config;
 690
 691         ret = 0;
 692 out:
 693         return ret;
 694 }
 695
 696 static void dt2801_detach(struct comedi_device *dev)
 697 {
 698         if (dev->iobase)
 699                 release_region(dev->iobase, DT2801_IOSIZE);
 700 }
 701
 702 static struct comedi_driver dt2801_driver = {
 703         .driver_name    = "dt2801",
 704         .module         = THIS_MODULE,
 705         .attach         = dt2801_attach,
 706         .detach         = dt2801_detach,
 707 };
 708 module_comedi_driver(dt2801_driver);
 709
 710 MODULE_AUTHOR("Comedi http://www.comedi.org");
 711 MODULE_DESCRIPTION("Comedi low-level driver");
 712 MODULE_LICENSE("GPL");