drivers/staging/comedi/drivers/das6402.c

   1 // SPDX-License-Identifier: GPL-2.0+
   2 /*
   3  * das6402.c
   4  * Comedi driver for DAS6402 compatible boards
   5  * Copyright(c) 2014 H Hartley Sweeten <hsweeten@visionengravers.com>
   6  *
   7  * Rewrite of an experimental driver by:
   8  * Copyright (C) 1999 Oystein Svendsen <svendsen@pvv.org>
   9  */
  10
  11 /*
  12  * Driver: das6402
  13  * Description: Keithley Metrabyte DAS6402 (& compatibles)
  14  * Devices: [Keithley Metrabyte] DAS6402-12 (das6402-12),
  15  *   DAS6402-16 (das6402-16)
  16  * Author: H Hartley Sweeten <hsweeten@visionengravers.com>
  17  * Updated: Fri, 14 Mar 2014 10:18:43 -0700
  18  * Status: unknown
  19  *
  20  * Configuration Options:
  21  *   [0] - I/O base address
  22  *   [1] - IRQ (optional, needed for async command support)
  23  */
  24
  25 #include <linux/module.h>
  26 #include <linux/interrupt.h>
  27
  28 #include "../comedidev.h"
  29
  30 #include "comedi_8254.h"
  31
  32 /*
  33  * Register I/O map
  34  */
  35 #define DAS6402_AI_DATA_REG             0x00
  36 #define DAS6402_AI_MUX_REG              0x02
  37 #define DAS6402_AI_MUX_LO(x)            (((x) & 0x3f) << 0)
  38 #define DAS6402_AI_MUX_HI(x)            (((x) & 0x3f) << 8)
  39 #define DAS6402_DI_DO_REG               0x03
  40 #define DAS6402_AO_DATA_REG(x)          (0x04 + ((x) * 2))
  41 #define DAS6402_AO_LSB_REG(x)           (0x04 + ((x) * 2))
  42 #define DAS6402_AO_MSB_REG(x)           (0x05 + ((x) * 2))
  43 #define DAS6402_STATUS_REG              0x08
  44 #define DAS6402_STATUS_FFNE             BIT(0)
  45 #define DAS6402_STATUS_FHALF            BIT(1)
  46 #define DAS6402_STATUS_FFULL            BIT(2)
  47 #define DAS6402_STATUS_XINT             BIT(3)
  48 #define DAS6402_STATUS_INT              BIT(4)
  49 #define DAS6402_STATUS_XTRIG            BIT(5)
  50 #define DAS6402_STATUS_INDGT            BIT(6)
  51 #define DAS6402_STATUS_10MHZ            BIT(7)
  52 #define DAS6402_STATUS_W_CLRINT         BIT(0)
  53 #define DAS6402_STATUS_W_CLRXTR         BIT(1)
  54 #define DAS6402_STATUS_W_CLRXIN         BIT(2)
  55 #define DAS6402_STATUS_W_EXTEND         BIT(4)
  56 #define DAS6402_STATUS_W_ARMED          BIT(5)
  57 #define DAS6402_STATUS_W_POSTMODE       BIT(6)
  58 #define DAS6402_STATUS_W_10MHZ          BIT(7)
  59 #define DAS6402_CTRL_REG                0x09
  60 #define DAS6402_CTRL_TRIG(x)            ((x) << 0)
  61 #define DAS6402_CTRL_SOFT_TRIG          DAS6402_CTRL_TRIG(0)
  62 #define DAS6402_CTRL_EXT_FALL_TRIG      DAS6402_CTRL_TRIG(1)
  63 #define DAS6402_CTRL_EXT_RISE_TRIG      DAS6402_CTRL_TRIG(2)
  64 #define DAS6402_CTRL_PACER_TRIG         DAS6402_CTRL_TRIG(3)
  65 #define DAS6402_CTRL_BURSTEN            BIT(2)
  66 #define DAS6402_CTRL_XINTE              BIT(3)
  67 #define DAS6402_CTRL_IRQ(x)             ((x) << 4)
  68 #define DAS6402_CTRL_INTE               BIT(7)
  69 #define DAS6402_TRIG_REG                0x0a
  70 #define DAS6402_TRIG_TGEN               BIT(0)
  71 #define DAS6402_TRIG_TGSEL              BIT(1)
  72 #define DAS6402_TRIG_TGPOL              BIT(2)
  73 #define DAS6402_TRIG_PRETRIG            BIT(3)
  74 #define DAS6402_AO_RANGE(_chan, _range) ((_range) << ((_chan) ? 6 : 4))
  75 #define DAS6402_AO_RANGE_MASK(_chan)    (3 << ((_chan) ? 6 : 4))
  76 #define DAS6402_MODE_REG                0x0b
  77 #define DAS6402_MODE_RANGE(x)           ((x) << 2)
  78 #define DAS6402_MODE_POLLED             DAS6402_MODE_RANGE(0)
  79 #define DAS6402_MODE_FIFONEPTY          DAS6402_MODE_RANGE(1)
  80 #define DAS6402_MODE_FIFOHFULL          DAS6402_MODE_RANGE(2)
  81 #define DAS6402_MODE_EOB                DAS6402_MODE_RANGE(3)
  82 #define DAS6402_MODE_ENHANCED           BIT(4)
  83 #define DAS6402_MODE_SE                 BIT(5)
  84 #define DAS6402_MODE_UNI                BIT(6)
  85 #define DAS6402_MODE_DMA(x)             ((x) << 7)
  86 #define DAS6402_MODE_DMA1               DAS6402_MODE_DMA(0)
  87 #define DAS6402_MODE_DMA3               DAS6402_MODE_DMA(1)
  88 #define DAS6402_TIMER_BASE              0x0c
  89
  90 static const struct comedi_lrange das6402_ai_ranges = {
  91         8, {
  92                 BIP_RANGE(10),
  93                 BIP_RANGE(5),
  94                 BIP_RANGE(2.5),
  95                 BIP_RANGE(1.25),
  96                 UNI_RANGE(10),
  97                 UNI_RANGE(5),
  98                 UNI_RANGE(2.5),
  99                 UNI_RANGE(1.25)
 100         }
 101 };
 102
 103 /*
 104  * Analog output ranges are programmable on the DAS6402/12.
 105  * For the DAS6402/16 the range bits have no function, the
 106  * DAC ranges are selected by switches on the board.
 107  */
 108 static const struct comedi_lrange das6402_ao_ranges = {
 109         4, {
 110                 BIP_RANGE(5),
 111                 BIP_RANGE(10),
 112                 UNI_RANGE(5),
 113                 UNI_RANGE(10)
 114         }
 115 };
 116
 117 struct das6402_boardinfo {
 118         const char *name;
 119         unsigned int maxdata;
 120 };
 121
 122 static struct das6402_boardinfo das6402_boards[] = {
 123         {
 124                 .name           = "das6402-12",
 125                 .maxdata        = 0x0fff,
 126         }, {
 127                 .name           = "das6402-16",
 128                 .maxdata        = 0xffff,
 129         },
 130 };
 131
 132 struct das6402_private {
 133         unsigned int irq;
 134         unsigned int ao_range;
 135 };
 136
 137 static void das6402_set_mode(struct comedi_device *dev,
 138                              unsigned int mode)
 139 {
 140         outb(DAS6402_MODE_ENHANCED | mode, dev->iobase + DAS6402_MODE_REG);
 141 }
 142
 143 static void das6402_set_extended(struct comedi_device *dev,
 144                                  unsigned int val)
 145 {
 146         outb(DAS6402_STATUS_W_EXTEND, dev->iobase + DAS6402_STATUS_REG);
 147         outb(DAS6402_STATUS_W_EXTEND | val, dev->iobase + DAS6402_STATUS_REG);
 148         outb(val, dev->iobase + DAS6402_STATUS_REG);
 149 }
 150
 151 static void das6402_clear_all_interrupts(struct comedi_device *dev)
 152 {
 153         outb(DAS6402_STATUS_W_CLRINT |
 154              DAS6402_STATUS_W_CLRXTR |
 155              DAS6402_STATUS_W_CLRXIN, dev->iobase + DAS6402_STATUS_REG);
 156 }
 157
 158 static void das6402_ai_clear_eoc(struct comedi_device *dev)
 159 {
 160         outb(DAS6402_STATUS_W_CLRINT, dev->iobase + DAS6402_STATUS_REG);
 161 }
 162
 163 static unsigned int das6402_ai_read_sample(struct comedi_device *dev,
 164                                            struct comedi_subdevice *s)
 165 {
 166         unsigned int val;
 167
 168         val = inw(dev->iobase + DAS6402_AI_DATA_REG);
 169         if (s->maxdata == 0x0fff)
 170                 val >>= 4;
 171         return val;
 172 }
 173
 174 static irqreturn_t das6402_interrupt(int irq, void *d)
 175 {
 176         struct comedi_device *dev = d;
 177         struct comedi_subdevice *s = dev->read_subdev;
 178         struct comedi_async *async = s->async;
 179         struct comedi_cmd *cmd = &async->cmd;
 180         unsigned int status;
 181
 182         status = inb(dev->iobase + DAS6402_STATUS_REG);
 183         if ((status & DAS6402_STATUS_INT) == 0)
 184                 return IRQ_NONE;
 185
 186         if (status & DAS6402_STATUS_FFULL) {
 187                 async->events |= COMEDI_CB_OVERFLOW;
 188         } else if (status & DAS6402_STATUS_FFNE) {
 189                 unsigned int val;
 190
 191                 val = das6402_ai_read_sample(dev, s);
 192                 comedi_buf_write_samples(s, &val, 1);
 193
 194                 if (cmd->stop_src == TRIG_COUNT &&
 195                     async->scans_done >= cmd->stop_arg)
 196                         async->events |= COMEDI_CB_EOA;
 197         }
 198
 199         das6402_clear_all_interrupts(dev);
 200
 201         comedi_handle_events(dev, s);
 202
 203         return IRQ_HANDLED;
 204 }
 205
 206 static void das6402_ai_set_mode(struct comedi_device *dev,
 207                                 struct comedi_subdevice *s,
 208                                 unsigned int chanspec,
 209                                 unsigned int mode)
 210 {
 211         unsigned int range = CR_RANGE(chanspec);
 212         unsigned int aref = CR_AREF(chanspec);
 213
 214         mode |= DAS6402_MODE_RANGE(range);
 215         if (aref == AREF_GROUND)
 216                 mode |= DAS6402_MODE_SE;
 217         if (comedi_range_is_unipolar(s, range))
 218                 mode |= DAS6402_MODE_UNI;
 219
 220         das6402_set_mode(dev, mode);
 221 }
 222
 223 static int das6402_ai_cmd(struct comedi_device *dev,
 224                           struct comedi_subdevice *s)
 225 {
 226         struct das6402_private *devpriv = dev->private;
 227         struct comedi_cmd *cmd = &s->async->cmd;
 228         unsigned int chan_lo = CR_CHAN(cmd->chanlist[0]);
 229         unsigned int chan_hi = CR_CHAN(cmd->chanlist[cmd->chanlist_len - 1]);
 230
 231         das6402_ai_set_mode(dev, s, cmd->chanlist[0], DAS6402_MODE_FIFONEPTY);
 232
 233         /* load the mux for chanlist conversion */
 234         outw(DAS6402_AI_MUX_HI(chan_hi) | DAS6402_AI_MUX_LO(chan_lo),
 235              dev->iobase + DAS6402_AI_MUX_REG);
 236
 237         comedi_8254_update_divisors(dev->pacer);
 238         comedi_8254_pacer_enable(dev->pacer, 1, 2, true);
 239
 240         /* enable interrupt and pacer trigger */
 241         outb(DAS6402_CTRL_INTE |
 242              DAS6402_CTRL_IRQ(devpriv->irq) |
 243              DAS6402_CTRL_PACER_TRIG, dev->iobase + DAS6402_CTRL_REG);
 244
 245         return 0;
 246 }
 247
 248 static int das6402_ai_check_chanlist(struct comedi_device *dev,
 249                                      struct comedi_subdevice *s,
 250                                      struct comedi_cmd *cmd)
 251 {
 252         unsigned int chan0 = CR_CHAN(cmd->chanlist[0]);
 253         unsigned int range0 = CR_RANGE(cmd->chanlist[0]);
 254         unsigned int aref0 = CR_AREF(cmd->chanlist[0]);
 255         int i;
 256
 257         for (i = 1; i < cmd->chanlist_len; i++) {
 258                 unsigned int chan = CR_CHAN(cmd->chanlist[i]);
 259                 unsigned int range = CR_RANGE(cmd->chanlist[i]);
 260                 unsigned int aref = CR_AREF(cmd->chanlist[i]);
 261
 262                 if (chan != chan0 + i) {
 263                         dev_dbg(dev->class_dev,
 264                                 "chanlist must be consecutive\n");
 265                         return -EINVAL;
 266                 }
 267
 268                 if (range != range0) {
 269                         dev_dbg(dev->class_dev,
 270                                 "chanlist must have the same range\n");
 271                         return -EINVAL;
 272                 }
 273
 274                 if (aref != aref0) {
 275                         dev_dbg(dev->class_dev,
 276                                 "chanlist must have the same reference\n");
 277                         return -EINVAL;
 278                 }
 279
 280                 if (aref0 == AREF_DIFF && chan > (s->n_chan / 2)) {
 281                         dev_dbg(dev->class_dev,
 282                                 "chanlist differential channel too large\n");
 283                         return -EINVAL;
 284                 }
 285         }
 286         return 0;
 287 }
 288
 289 static int das6402_ai_cmdtest(struct comedi_device *dev,
 290                               struct comedi_subdevice *s,
 291                               struct comedi_cmd *cmd)
 292 {
 293         int err = 0;
 294         unsigned int arg;
 295
 296         /* Step 1 : check if triggers are trivially valid */
 297
 298         err |= comedi_check_trigger_src(&cmd->start_src, TRIG_NOW);
 299         err |= comedi_check_trigger_src(&cmd->scan_begin_src, TRIG_FOLLOW);
 300         err |= comedi_check_trigger_src(&cmd->convert_src, TRIG_TIMER);
 301         err |= comedi_check_trigger_src(&cmd->scan_end_src, TRIG_COUNT);
 302         err |= comedi_check_trigger_src(&cmd->stop_src, TRIG_COUNT | TRIG_NONE);
 303
 304         if (err)
 305                 return 1;
 306
 307         /* Step 2a : make sure trigger sources are unique */
 308
 309         err |= comedi_check_trigger_is_unique(cmd->stop_src);
 310
 311         /* Step 2b : and mutually compatible */
 312
 313         if (err)
 314                 return 2;
 315
 316         /* Step 3: check if arguments are trivially valid */
 317
 318         err |= comedi_check_trigger_arg_is(&cmd->start_arg, 0);
 319         err |= comedi_check_trigger_arg_is(&cmd->scan_begin_arg, 0);
 320         err |= comedi_check_trigger_arg_min(&cmd->convert_arg, 10000);
 321         err |= comedi_check_trigger_arg_min(&cmd->chanlist_len, 1);
 322         err |= comedi_check_trigger_arg_is(&cmd->scan_end_arg,
 323                                            cmd->chanlist_len);
 324
 325         if (cmd->stop_src == TRIG_COUNT)
 326                 err |= comedi_check_trigger_arg_min(&cmd->stop_arg, 1);
 327         else    /* TRIG_NONE */
 328                 err |= comedi_check_trigger_arg_is(&cmd->stop_arg, 0);
 329
 330         if (err)
 331                 return 3;
 332
 333         /* step 4: fix up any arguments */
 334
 335         arg = cmd->convert_arg;
 336         comedi_8254_cascade_ns_to_timer(dev->pacer, &arg, cmd->flags);
 337         err |= comedi_check_trigger_arg_is(&cmd->convert_arg, arg);
 338
 339         if (err)
 340                 return 4;
 341
 342         /* Step 5: check channel list if it exists */
 343         if (cmd->chanlist && cmd->chanlist_len > 0)
 344                 err |= das6402_ai_check_chanlist(dev, s, cmd);
 345
 346         if (err)
 347                 return 5;
 348
 349         return 0;
 350 }
 351
 352 static int das6402_ai_cancel(struct comedi_device *dev,
 353                              struct comedi_subdevice *s)
 354 {
 355         outb(DAS6402_CTRL_SOFT_TRIG, dev->iobase + DAS6402_CTRL_REG);
 356
 357         return 0;
 358 }
 359
 360 static void das6402_ai_soft_trig(struct comedi_device *dev)
 361 {
 362         outw(0, dev->iobase + DAS6402_AI_DATA_REG);
 363 }
 364
 365 static int das6402_ai_eoc(struct comedi_device *dev,
 366                           struct comedi_subdevice *s,
 367                           struct comedi_insn *insn,
 368                           unsigned long context)
 369 {
 370         unsigned int status;
 371
 372         status = inb(dev->iobase + DAS6402_STATUS_REG);
 373         if (status & DAS6402_STATUS_FFNE)
 374                 return 0;
 375         return -EBUSY;
 376 }
 377
 378 static int das6402_ai_insn_read(struct comedi_device *dev,
 379                                 struct comedi_subdevice *s,
 380                                 struct comedi_insn *insn,
 381                                 unsigned int *data)
 382 {
 383         unsigned int chan = CR_CHAN(insn->chanspec);
 384         unsigned int aref = CR_AREF(insn->chanspec);
 385         int ret;
 386         int i;
 387
 388         if (aref == AREF_DIFF && chan > (s->n_chan / 2))
 389                 return -EINVAL;
 390
 391         /* enable software conversion trigger */
 392         outb(DAS6402_CTRL_SOFT_TRIG, dev->iobase + DAS6402_CTRL_REG);
 393
 394         das6402_ai_set_mode(dev, s, insn->chanspec, DAS6402_MODE_POLLED);
 395
 396         /* load the mux for single channel conversion */
 397         outw(DAS6402_AI_MUX_HI(chan) | DAS6402_AI_MUX_LO(chan),
 398              dev->iobase + DAS6402_AI_MUX_REG);
 399
 400         for (i = 0; i < insn->n; i++) {
 401                 das6402_ai_clear_eoc(dev);
 402                 das6402_ai_soft_trig(dev);
 403
 404                 ret = comedi_timeout(dev, s, insn, das6402_ai_eoc, 0);
 405                 if (ret)
 406                         break;
 407
 408                 data[i] = das6402_ai_read_sample(dev, s);
 409         }
 410
 411         das6402_ai_clear_eoc(dev);
 412
 413         return insn->n;
 414 }
 415
 416 static int das6402_ao_insn_write(struct comedi_device *dev,
 417                                  struct comedi_subdevice *s,
 418                                  struct comedi_insn *insn,
 419                                  unsigned int *data)
 420 {
 421         struct das6402_private *devpriv = dev->private;
 422         unsigned int chan = CR_CHAN(insn->chanspec);
 423         unsigned int range = CR_RANGE(insn->chanspec);
 424         unsigned int val;
 425         int i;
 426
 427         /* set the range for this channel */
 428         val = devpriv->ao_range;
 429         val &= ~DAS6402_AO_RANGE_MASK(chan);
 430         val |= DAS6402_AO_RANGE(chan, range);
 431         if (val != devpriv->ao_range) {
 432                 devpriv->ao_range = val;
 433                 outb(val, dev->iobase + DAS6402_TRIG_REG);
 434         }
 435
 436         /*
 437          * The DAS6402/16 has a jumper to select either individual
 438          * update (UPDATE) or simultaneous updating (XFER) of both
 439          * DAC's. In UPDATE mode, when the MSB is written, that DAC
 440          * is updated. In XFER mode, after both DAC's are loaded,
 441          * a read cycle of any DAC register will update both DAC's
 442          * simultaneously.
 443          *
 444          * If you have XFER mode enabled a (*insn_read) will need
 445          * to be performed in order to update the DAC's with the
 446          * last value written.
 447          */
 448         for (i = 0; i < insn->n; i++) {
 449                 val = data[i];
 450
 451                 s->readback[chan] = val;
 452
 453                 if (s->maxdata == 0x0fff) {
 454                         /*
 455                          * DAS6402/12 has the two 8-bit DAC registers, left
 456                          * justified (the 4 LSB bits are don't care). Data
 457                          * can be written as one word.
 458                          */
 459                         val <<= 4;
 460                         outw(val, dev->iobase + DAS6402_AO_DATA_REG(chan));
 461                 } else {
 462                         /*
 463                          * DAS6402/16 uses both 8-bit DAC registers and needs
 464                          * to be written LSB then MSB.
 465                          */
 466                         outb(val & 0xff,
 467                              dev->iobase + DAS6402_AO_LSB_REG(chan));
 468                         outb((val >> 8) & 0xff,
 469                              dev->iobase + DAS6402_AO_LSB_REG(chan));
 470                 }
 471         }
 472
 473         return insn->n;
 474 }
 475
 476 static int das6402_ao_insn_read(struct comedi_device *dev,
 477                                 struct comedi_subdevice *s,
 478                                 struct comedi_insn *insn,
 479                                 unsigned int *data)
 480 {
 481         unsigned int chan = CR_CHAN(insn->chanspec);
 482
 483         /*
 484          * If XFER mode is enabled, reading any DAC register
 485          * will update both DAC's simultaneously.
 486          */
 487         inw(dev->iobase + DAS6402_AO_LSB_REG(chan));
 488
 489         return comedi_readback_insn_read(dev, s, insn, data);
 490 }
 491
 492 static int das6402_di_insn_bits(struct comedi_device *dev,
 493                                 struct comedi_subdevice *s,
 494                                 struct comedi_insn *insn,
 495                                 unsigned int *data)
 496 {
 497         data[1] = inb(dev->iobase + DAS6402_DI_DO_REG);
 498
 499         return insn->n;
 500 }
 501
 502 static int das6402_do_insn_bits(struct comedi_device *dev,
 503                                 struct comedi_subdevice *s,
 504                                 struct comedi_insn *insn,
 505                                 unsigned int *data)
 506 {
 507         if (comedi_dio_update_state(s, data))
 508                 outb(s->state, dev->iobase + DAS6402_DI_DO_REG);
 509
 510         data[1] = s->state;
 511
 512         return insn->n;
 513 }
 514
 515 static void das6402_reset(struct comedi_device *dev)
 516 {
 517         struct das6402_private *devpriv = dev->private;
 518
 519         /* enable "Enhanced" mode */
 520         outb(DAS6402_MODE_ENHANCED, dev->iobase + DAS6402_MODE_REG);
 521
 522         /* enable 10MHz pacer clock */
 523         das6402_set_extended(dev, DAS6402_STATUS_W_10MHZ);
 524
 525         /* enable software conversion trigger */
 526         outb(DAS6402_CTRL_SOFT_TRIG, dev->iobase + DAS6402_CTRL_REG);
 527
 528         /* default ADC to single-ended unipolar 10V inputs */
 529         das6402_set_mode(dev, DAS6402_MODE_RANGE(0) |
 530                               DAS6402_MODE_POLLED |
 531                               DAS6402_MODE_SE |
 532                               DAS6402_MODE_UNI);
 533
 534         /* default mux for single channel conversion (channel 0) */
 535         outw(DAS6402_AI_MUX_HI(0) | DAS6402_AI_MUX_LO(0),
 536              dev->iobase + DAS6402_AI_MUX_REG);
 537
 538         /* set both DAC's for unipolar 5V output range */
 539         devpriv->ao_range = DAS6402_AO_RANGE(0, 2) | DAS6402_AO_RANGE(1, 2);
 540         outb(devpriv->ao_range, dev->iobase + DAS6402_TRIG_REG);
 541
 542         /* set both DAC's to 0V */
 543         outw(0, dev->iobase + DAS6402_AO_DATA_REG(0));
 544         outw(0, dev->iobase + DAS6402_AO_DATA_REG(0));
 545         inw(dev->iobase + DAS6402_AO_LSB_REG(0));
 546
 547         /* set all digital outputs low */
 548         outb(0, dev->iobase + DAS6402_DI_DO_REG);
 549
 550         das6402_clear_all_interrupts(dev);
 551 }
 552
 553 static int das6402_attach(struct comedi_device *dev,
 554                           struct comedi_devconfig *it)
 555 {
 556         const struct das6402_boardinfo *board = dev->board_ptr;
 557         struct das6402_private *devpriv;
 558         struct comedi_subdevice *s;
 559         int ret;
 560
 561         devpriv = comedi_alloc_devpriv(dev, sizeof(*devpriv));
 562         if (!devpriv)
 563                 return -ENOMEM;
 564
 565         ret = comedi_request_region(dev, it->options[0], 0x10);
 566         if (ret)
 567                 return ret;
 568
 569         das6402_reset(dev);
 570
 571         /* IRQs 2,3,5,6,7, 10,11,15 are valid for "enhanced" mode */
 572         if ((1 << it->options[1]) & 0x8cec) {
 573                 ret = request_irq(it->options[1], das6402_interrupt, 0,
 574                                   dev->board_name, dev);
 575                 if (ret == 0) {
 576                         dev->irq = it->options[1];
 577
 578                         switch (dev->irq) {
 579                         case 10:
 580                                 devpriv->irq = 4;
 581                                 break;
 582                         case 11:
 583                                 devpriv->irq = 1;
 584                                 break;
 585                         case 15:
 586                                 devpriv->irq = 6;
 587                                 break;
 588                         default:
 589                                 devpriv->irq = dev->irq;
 590                                 break;
 591                         }
 592                 }
 593         }
 594
 595         dev->pacer = comedi_8254_init(dev->iobase + DAS6402_TIMER_BASE,
 596                                       I8254_OSC_BASE_10MHZ, I8254_IO8, 0);
 597         if (!dev->pacer)
 598                 return -ENOMEM;
 599
 600         ret = comedi_alloc_subdevices(dev, 4);
 601         if (ret)
 602                 return ret;
 603
 604         /* Analog Input subdevice */
 605         s = &dev->subdevices[0];
 606         s->type         = COMEDI_SUBD_AI;
 607         s->subdev_flags = SDF_READABLE | SDF_GROUND | SDF_DIFF;
 608         s->n_chan       = 64;
 609         s->maxdata      = board->maxdata;
 610         s->range_table  = &das6402_ai_ranges;
 611         s->insn_read    = das6402_ai_insn_read;
 612         if (dev->irq) {
 613                 dev->read_subdev = s;
 614                 s->subdev_flags |= SDF_CMD_READ;
 615                 s->len_chanlist = s->n_chan;
 616                 s->do_cmdtest   = das6402_ai_cmdtest;
 617                 s->do_cmd       = das6402_ai_cmd;
 618                 s->cancel       = das6402_ai_cancel;
 619         }
 620
 621         /* Analog Output subdevice */
 622         s = &dev->subdevices[1];
 623         s->type         = COMEDI_SUBD_AO;
 624         s->subdev_flags = SDF_WRITABLE;
 625         s->n_chan       = 2;
 626         s->maxdata      = board->maxdata;
 627         s->range_table  = &das6402_ao_ranges;
 628         s->insn_write   = das6402_ao_insn_write;
 629         s->insn_read    = das6402_ao_insn_read;
 630
 631         ret = comedi_alloc_subdev_readback(s);
 632         if (ret)
 633                 return ret;
 634
 635         /* Digital Input subdevice */
 636         s = &dev->subdevices[2];
 637         s->type         = COMEDI_SUBD_DI;
 638         s->subdev_flags = SDF_READABLE;
 639         s->n_chan       = 8;
 640         s->maxdata      = 1;
 641         s->range_table  = &range_digital;
 642         s->insn_bits    = das6402_di_insn_bits;
 643
 644         /* Digital Input subdevice */
 645         s = &dev->subdevices[3];
 646         s->type         = COMEDI_SUBD_DO;
 647         s->subdev_flags = SDF_WRITABLE;
 648         s->n_chan       = 8;
 649         s->maxdata      = 1;
 650         s->range_table  = &range_digital;
 651         s->insn_bits    = das6402_do_insn_bits;
 652
 653         return 0;
 654 }
 655
 656 static struct comedi_driver das6402_driver = {
 657         .driver_name    = "das6402",
 658         .module         = THIS_MODULE,
 659         .attach         = das6402_attach,
 660         .detach         = comedi_legacy_detach,
 661         .board_name     = &das6402_boards[0].name,
 662         .num_names      = ARRAY_SIZE(das6402_boards),
 663         .offset         = sizeof(struct das6402_boardinfo),
 664 };
 665 module_comedi_driver(das6402_driver)
 666
 667 MODULE_AUTHOR("H Hartley Sweeten <hsweeten@visionengravers.com>");
 668 MODULE_DESCRIPTION("Comedi driver for DAS6402 compatible boards");
 669 MODULE_LICENSE("GPL");