drivers/staging/comedi/drivers/pcl711.c

   1 /*
   2    comedi/drivers/pcl711.c
   3    hardware driver for PC-LabCard PCL-711 and AdSys ACL-8112
   4    and compatibles
   5
   6    COMEDI - Linux Control and Measurement Device Interface
   7    Copyright (C) 1998 David A. Schleef <ds@schleef.org>
   8    Janne Jalkanen <jalkanen@cs.hut.fi>
   9    Eric Bunn <ebu@cs.hut.fi>
  10
  11    This program is free software; you can redistribute it and/or modify
  12    it under the terms of the GNU General Public License as published by
  13    the Free Software Foundation; either version 2 of the License, or
  14    (at your option) any later version.
  15
  16    This program is distributed in the hope that it will be useful,
  17    but WITHOUT ANY WARRANTY; without even the implied warranty of
  18    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  19    GNU General Public License for more details.
  20
  21    You should have received a copy of the GNU General Public License
  22    along with this program; if not, write to the Free Software
  23    Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  24
  25  */
  26 /*
  27 Driver: pcl711
  28 Description: Advantech PCL-711 and 711b, ADLink ACL-8112
  29 Author: ds, Janne Jalkanen <jalkanen@cs.hut.fi>, Eric Bunn <ebu@cs.hut.fi>
  30 Status: mostly complete
  31 Devices: [Advantech] PCL-711 (pcl711), PCL-711B (pcl711b),
  32   [AdLink] ACL-8112HG (acl8112hg), ACL-8112DG (acl8112dg)
  33
  34 Since these boards do not have DMA or FIFOs, only immediate mode is
  35 supported.
  36
  37 */
  38
  39 /*
  40    Dave Andruczyk <dave@tech.buffalostate.edu> also wrote a
  41    driver for the PCL-711.  I used a few ideas from his driver
  42    here.  His driver also has more comments, if you are
  43    interested in understanding how this driver works.
  44    http://tech.buffalostate.edu/~dave/driver/
  45
  46    The ACL-8112 driver was hacked from the sources of the PCL-711
  47    driver (the 744 chip used on the 8112 is almost the same as
  48    the 711b chip, but it has more I/O channels) by
  49    Janne Jalkanen (jalkanen@cs.hut.fi) and
  50    Erik Bunn (ebu@cs.hut.fi).  Remerged with the PCL-711 driver
  51    by ds.
  52
  53    [acl-8112]
  54    This driver supports both TRIGNOW and TRIGCLK,
  55    but does not yet support DMA transfers.  It also supports
  56    both high (HG) and low (DG) versions of the card, though
  57    the HG version has been untested.
  58
  59  */
  60
  61 #include "../comedidev.h"
  62
  63 #include <linux/ioport.h>
  64 #include <linux/delay.h>
  65
  66 #include "8253.h"
  67
  68 #define PCL711_SIZE 16
  69
  70 #define PCL711_CTR0 0
  71 #define PCL711_CTR1 1
  72 #define PCL711_CTR2 2
  73 #define PCL711_CTRCTL 3
  74 #define PCL711_AD_LO 4
  75 #define PCL711_DA0_LO 4
  76 #define PCL711_AD_HI 5
  77 #define PCL711_DA0_HI 5
  78 #define PCL711_DI_LO 6
  79 #define PCL711_DA1_LO 6
  80 #define PCL711_DI_HI 7
  81 #define PCL711_DA1_HI 7
  82 #define PCL711_CLRINTR 8
  83 #define PCL711_GAIN 9
  84 #define PCL711_MUX 10
  85 #define PCL711_MODE 11
  86 #define PCL711_SOFTTRIG 12
  87 #define PCL711_DO_LO 13
  88 #define PCL711_DO_HI 14
  89
  90 static const struct comedi_lrange range_pcl711b_ai = { 5, {
  91                         BIP_RANGE(5),
  92                         BIP_RANGE(2.5),
  93                         BIP_RANGE(1.25),
  94                         BIP_RANGE(0.625),
  95                         BIP_RANGE(0.3125)
  96         }
  97 };
  98 static const struct comedi_lrange range_acl8112hg_ai = { 12, {
  99                         BIP_RANGE(5),
 100                         BIP_RANGE(0.5),
 101                         BIP_RANGE(0.05),
 102                         BIP_RANGE(0.005),
 103                         UNI_RANGE(10),
 104                         UNI_RANGE(1),
 105                         UNI_RANGE(0.1),
 106                         UNI_RANGE(0.01),
 107                         BIP_RANGE(10),
 108                         BIP_RANGE(1),
 109                         BIP_RANGE(0.1),
 110                         BIP_RANGE(0.01)
 111         }
 112 };
 113 static const struct comedi_lrange range_acl8112dg_ai = { 9, {
 114                         BIP_RANGE(5),
 115                         BIP_RANGE(2.5),
 116                         BIP_RANGE(1.25),
 117                         BIP_RANGE(0.625),
 118                         UNI_RANGE(10),
 119                         UNI_RANGE(5),
 120                         UNI_RANGE(2.5),
 121                         UNI_RANGE(1.25),
 122                         BIP_RANGE(10)
 123         }
 124 };
 125
 126 /*
 127  * flags
 128  */
 129
 130 #define PCL711_TIMEOUT 100
 131 #define PCL711_DRDY 0x10
 132
 133 static const int i8253_osc_base = 500;  /* 2 Mhz */
 134
 135 struct pcl711_board {
 136
 137         const char *name;
 138         int is_pcl711b;
 139         int is_8112;
 140         int is_dg;
 141         int n_ranges;
 142         int n_aichan;
 143         int n_aochan;
 144         int maxirq;
 145         const struct comedi_lrange *ai_range_type;
 146 };
 147
 148
 149 static const struct pcl711_board boardtypes[] = {
 150         {"pcl711", 0, 0, 0, 5, 8, 1, 0, &range_bipolar5},
 151         {"pcl711b", 1, 0, 0, 5, 8, 1, 7, &range_pcl711b_ai},
 152         {"acl8112hg", 0, 1, 0, 12, 16, 2, 15, &range_acl8112hg_ai},
 153         {"acl8112dg", 0, 1, 1, 9, 16, 2, 15, &range_acl8112dg_ai},
 154 };
 155
 156 #define n_boardtypes (sizeof(boardtypes)/sizeof(struct pcl711_board))
 157 #define this_board ((const struct pcl711_board *)dev->board_ptr)
 158
 159 static int pcl711_attach(struct comedi_device * dev, struct comedi_devconfig * it);
 160 static int pcl711_detach(struct comedi_device * dev);
 161 static struct comedi_driver driver_pcl711 = {
 162       driver_name:"pcl711",
 163       module:THIS_MODULE,
 164       attach:pcl711_attach,
 165       detach:pcl711_detach,
 166       board_name:&boardtypes[0].name,
 167       num_names:n_boardtypes,
 168       offset:sizeof(struct pcl711_board),
 169 };
 170
 171 COMEDI_INITCLEANUP(driver_pcl711);
 172
 173 struct pcl711_private {
 174
 175         int board;
 176         int adchan;
 177         int ntrig;
 178         int aip[8];
 179         int mode;
 180         unsigned int ao_readback[2];
 181         unsigned int divisor1;
 182         unsigned int divisor2;
 183 };
 184
 185
 186 #define devpriv ((struct pcl711_private *)dev->private)
 187
 188 static irqreturn_t pcl711_interrupt(int irq, void *d PT_REGS_ARG)
 189 {
 190         int lo, hi;
 191         int data;
 192         struct comedi_device *dev = d;
 193         struct comedi_subdevice *s = dev->subdevices + 0;
 194
 195         if (!dev->attached) {
 196                 comedi_error(dev, "spurious interrupt");
 197                 return IRQ_HANDLED;
 198         }
 199
 200         hi = inb(dev->iobase + PCL711_AD_HI);
 201         lo = inb(dev->iobase + PCL711_AD_LO);
 202         outb(0, dev->iobase + PCL711_CLRINTR);
 203
 204         data = (hi << 8) | lo;
 205
 206         /* FIXME! Nothing else sets ntrig! */
 207         if (!(--devpriv->ntrig)) {
 208                 if (this_board->is_8112) {
 209                         outb(1, dev->iobase + PCL711_MODE);
 210                 } else {
 211                         outb(0, dev->iobase + PCL711_MODE);
 212                 }
 213
 214                 s->async->events |= COMEDI_CB_EOA;
 215         }
 216         comedi_event(dev, s);
 217         return IRQ_HANDLED;
 218 }
 219
 220 static void pcl711_set_changain(struct comedi_device * dev, int chan)
 221 {
 222         int chan_register;
 223
 224         outb(CR_RANGE(chan), dev->iobase + PCL711_GAIN);
 225
 226         chan_register = CR_CHAN(chan);
 227
 228         if (this_board->is_8112) {
 229
 230                 /*
 231                  *  Set the correct channel.  The two channel banks are switched
 232                  *  using the mask value.
 233                  *  NB: To use differential channels, you should use mask = 0x30,
 234                  *  but I haven't written the support for this yet. /JJ
 235                  */
 236
 237                 if (chan_register >= 8) {
 238                         chan_register = 0x20 | (chan_register & 0x7);
 239                 } else {
 240                         chan_register |= 0x10;
 241                 }
 242         } else {
 243                 outb(chan_register, dev->iobase + PCL711_MUX);
 244         }
 245 }
 246
 247 static int pcl711_ai_insn(struct comedi_device * dev, struct comedi_subdevice * s,
 248         struct comedi_insn * insn, unsigned int * data)
 249 {
 250         int i, n;
 251         int hi, lo;
 252
 253         pcl711_set_changain(dev, insn->chanspec);
 254
 255         for (n = 0; n < insn->n; n++) {
 256                 /*
 257                  *  Write the correct mode (software polling) and start polling by writing
 258                  *  to the trigger register
 259                  */
 260                 outb(1, dev->iobase + PCL711_MODE);
 261
 262                 if (this_board->is_8112) {
 263                 } else {
 264                         outb(0, dev->iobase + PCL711_SOFTTRIG);
 265                 }
 266
 267                 i = PCL711_TIMEOUT;
 268                 while (--i) {
 269                         hi = inb(dev->iobase + PCL711_AD_HI);
 270                         if (!(hi & PCL711_DRDY))
 271                                 goto ok;
 272                         comedi_udelay(1);
 273                 }
 274                 rt_printk("comedi%d: pcl711: A/D timeout\n", dev->minor);
 275                 return -ETIME;
 276
 277               ok:
 278                 lo = inb(dev->iobase + PCL711_AD_LO);
 279
 280                 data[n] = ((hi & 0xf) << 8) | lo;
 281         }
 282
 283         return n;
 284 }
 285
 286 static int pcl711_ai_cmdtest(struct comedi_device * dev, struct comedi_subdevice * s,
 287         struct comedi_cmd * cmd)
 288 {
 289         int tmp;
 290         int err = 0;
 291
 292         /* step 1 */
 293         tmp = cmd->start_src;
 294         cmd->start_src &= TRIG_NOW;
 295         if (!cmd->start_src || tmp != cmd->start_src)
 296                 err++;
 297
 298         tmp = cmd->scan_begin_src;
 299         cmd->scan_begin_src &= TRIG_TIMER | TRIG_EXT;
 300         if (!cmd->scan_begin_src || tmp != cmd->scan_begin_src)
 301                 err++;
 302
 303         tmp = cmd->convert_src;
 304         cmd->convert_src &= TRIG_NOW;
 305         if (!cmd->convert_src || tmp != cmd->convert_src)
 306                 err++;
 307
 308         tmp = cmd->scan_end_src;
 309         cmd->scan_end_src &= TRIG_COUNT;
 310         if (!cmd->scan_end_src || tmp != cmd->scan_end_src)
 311                 err++;
 312
 313         tmp = cmd->stop_src;
 314         cmd->stop_src &= TRIG_COUNT | TRIG_NONE;
 315         if (!cmd->stop_src || tmp != cmd->stop_src)
 316                 err++;
 317
 318         if (err)
 319                 return 1;
 320
 321         /* step 2 */
 322
 323         if (cmd->scan_begin_src != TRIG_TIMER &&
 324                 cmd->scan_begin_src != TRIG_EXT)
 325                 err++;
 326         if (cmd->stop_src != TRIG_COUNT && cmd->stop_src != TRIG_NONE)
 327                 err++;
 328
 329         if (err)
 330                 return 2;
 331
 332         /* step 3 */
 333
 334         if (cmd->start_arg != 0) {
 335                 cmd->start_arg = 0;
 336                 err++;
 337         }
 338         if (cmd->scan_begin_src == TRIG_EXT) {
 339                 if (cmd->scan_begin_arg != 0) {
 340                         cmd->scan_begin_arg = 0;
 341                         err++;
 342                 }
 343         } else {
 344 #define MAX_SPEED 1000
 345 #define TIMER_BASE 100
 346                 if (cmd->scan_begin_arg < MAX_SPEED) {
 347                         cmd->scan_begin_arg = MAX_SPEED;
 348                         err++;
 349                 }
 350         }
 351         if (cmd->convert_arg != 0) {
 352                 cmd->convert_arg = 0;
 353                 err++;
 354         }
 355         if (cmd->scan_end_arg != cmd->chanlist_len) {
 356                 cmd->scan_end_arg = cmd->chanlist_len;
 357                 err++;
 358         }
 359         if (cmd->stop_src == TRIG_NONE) {
 360                 if (cmd->stop_arg != 0) {
 361                         cmd->stop_arg = 0;
 362                         err++;
 363                 }
 364         } else {
 365                 /* ignore */
 366         }
 367
 368         if (err)
 369                 return 3;
 370
 371         /* step 4 */
 372
 373         if (cmd->scan_begin_src == TRIG_TIMER) {
 374                 tmp = cmd->scan_begin_arg;
 375                 i8253_cascade_ns_to_timer_2div(TIMER_BASE,
 376                         &devpriv->divisor1, &devpriv->divisor2,
 377                         &cmd->scan_begin_arg, cmd->flags & TRIG_ROUND_MASK);
 378                 if (tmp != cmd->scan_begin_arg)
 379                         err++;
 380         }
 381
 382         if (err)
 383                 return 4;
 384
 385         return 0;
 386 }
 387
 388 static int pcl711_ai_cmd(struct comedi_device * dev, struct comedi_subdevice * s)
 389 {
 390         int timer1, timer2;
 391         struct comedi_cmd *cmd = &s->async->cmd;
 392
 393         pcl711_set_changain(dev, cmd->chanlist[0]);
 394
 395         if (cmd->scan_begin_src == TRIG_TIMER) {
 396                 /*
 397                  *  Set timers
 398                  *      timer chip is an 8253, with timers 1 and 2
 399                  *      cascaded
 400                  *  0x74 = Select Counter 1 | LSB/MSB | Mode=2 | Binary
 401                  *        Mode 2 = Rate generator
 402                  *
 403                  *  0xb4 = Select Counter 2 | LSB/MSB | Mode=2 | Binary
 404                  */
 405
 406                 i8253_cascade_ns_to_timer(i8253_osc_base, &timer1, &timer2,
 407                         &cmd->scan_begin_arg, TRIG_ROUND_NEAREST);
 408
 409                 outb(0x74, dev->iobase + PCL711_CTRCTL);
 410                 outb(timer1 & 0xff, dev->iobase + PCL711_CTR1);
 411                 outb((timer1 >> 8) & 0xff, dev->iobase + PCL711_CTR1);
 412                 outb(0xb4, dev->iobase + PCL711_CTRCTL);
 413                 outb(timer2 & 0xff, dev->iobase + PCL711_CTR2);
 414                 outb((timer2 >> 8) & 0xff, dev->iobase + PCL711_CTR2);
 415
 416                 /* clear pending interrupts (just in case) */
 417                 outb(0, dev->iobase + PCL711_CLRINTR);
 418
 419                 /*
 420                  *  Set mode to IRQ transfer
 421                  */
 422                 outb(devpriv->mode | 6, dev->iobase + PCL711_MODE);
 423         } else {
 424                 /* external trigger */
 425                 outb(devpriv->mode | 3, dev->iobase + PCL711_MODE);
 426         }
 427
 428         return 0;
 429 }
 430
 431 /*
 432    analog output
 433 */
 434 static int pcl711_ao_insn(struct comedi_device * dev, struct comedi_subdevice * s,
 435         struct comedi_insn * insn, unsigned int * data)
 436 {
 437         int n;
 438         int chan = CR_CHAN(insn->chanspec);
 439
 440         for (n = 0; n < insn->n; n++) {
 441                 outb((data[n] & 0xff),
 442                         dev->iobase + (chan ? PCL711_DA1_LO : PCL711_DA0_LO));
 443                 outb((data[n] >> 8),
 444                         dev->iobase + (chan ? PCL711_DA1_HI : PCL711_DA0_HI));
 445
 446                 devpriv->ao_readback[chan] = data[n];
 447         }
 448
 449         return n;
 450 }
 451
 452 static int pcl711_ao_insn_read(struct comedi_device * dev, struct comedi_subdevice * s,
 453         struct comedi_insn * insn, unsigned int * data)
 454 {
 455         int n;
 456         int chan = CR_CHAN(insn->chanspec);
 457
 458         for (n = 0; n < insn->n; n++) {
 459                 data[n] = devpriv->ao_readback[chan];
 460         }
 461
 462         return n;
 463
 464 }
 465
 466 /* Digital port read - Untested on 8112 */
 467 static int pcl711_di_insn_bits(struct comedi_device * dev, struct comedi_subdevice * s,
 468         struct comedi_insn * insn, unsigned int * data)
 469 {
 470         if (insn->n != 2)
 471                 return -EINVAL;
 472
 473         data[1] = inb(dev->iobase + PCL711_DI_LO) |
 474                 (inb(dev->iobase + PCL711_DI_HI) << 8);
 475
 476         return 2;
 477 }
 478
 479 /* Digital port write - Untested on 8112 */
 480 static int pcl711_do_insn_bits(struct comedi_device * dev, struct comedi_subdevice * s,
 481         struct comedi_insn * insn, unsigned int * data)
 482 {
 483         if (insn->n != 2)
 484                 return -EINVAL;
 485
 486         if (data[0]) {
 487                 s->state &= ~data[0];
 488                 s->state |= data[0] & data[1];
 489         }
 490         if (data[0] & 0x00ff)
 491                 outb(s->state & 0xff, dev->iobase + PCL711_DO_LO);
 492         if (data[0] & 0xff00)
 493                 outb((s->state >> 8), dev->iobase + PCL711_DO_HI);
 494
 495         data[1] = s->state;
 496
 497         return 2;
 498 }
 499
 500 /*  Free any resources that we have claimed  */
 501 static int pcl711_detach(struct comedi_device * dev)
 502 {
 503         printk("comedi%d: pcl711: remove\n", dev->minor);
 504
 505         if (dev->irq)
 506                 comedi_free_irq(dev->irq, dev);
 507
 508         if (dev->iobase)
 509                 release_region(dev->iobase, PCL711_SIZE);
 510
 511         return 0;
 512 }
 513
 514 /*  Initialization */
 515 static int pcl711_attach(struct comedi_device * dev, struct comedi_devconfig * it)
 516 {
 517         int ret;
 518         unsigned long iobase;
 519         unsigned int irq;
 520         struct comedi_subdevice *s;
 521
 522         /* claim our I/O space */
 523
 524         iobase = it->options[0];
 525         printk("comedi%d: pcl711: 0x%04lx ", dev->minor, iobase);
 526         if (!request_region(iobase, PCL711_SIZE, "pcl711")) {
 527                 printk("I/O port conflict\n");
 528                 return -EIO;
 529         }
 530         dev->iobase = iobase;
 531
 532         /* there should be a sanity check here */
 533
 534         /* set up some name stuff */
 535         dev->board_name = this_board->name;
 536
 537         /* grab our IRQ */
 538         irq = it->options[1];
 539         if (irq > this_board->maxirq) {
 540                 printk("irq out of range\n");
 541                 return -EINVAL;
 542         }
 543         if (irq) {
 544                 if (comedi_request_irq(irq, pcl711_interrupt, 0, "pcl711", dev)) {
 545                         printk("unable to allocate irq %u\n", irq);
 546                         return -EINVAL;
 547                 } else {
 548                         printk("( irq = %u )\n", irq);
 549                 }
 550         }
 551         dev->irq = irq;
 552
 553         if ((ret = alloc_subdevices(dev, 4)) < 0)
 554                 return ret;
 555         if ((ret = alloc_private(dev, sizeof(struct pcl711_private))) < 0)
 556                 return ret;
 557
 558         s = dev->subdevices + 0;
 559         /* AI subdevice */
 560         s->type = COMEDI_SUBD_AI;
 561         s->subdev_flags = SDF_READABLE | SDF_GROUND;
 562         s->n_chan = this_board->n_aichan;
 563         s->maxdata = 0xfff;
 564         s->len_chanlist = 1;
 565         s->range_table = this_board->ai_range_type;
 566         s->insn_read = pcl711_ai_insn;
 567         if (irq) {
 568                 dev->read_subdev = s;
 569                 s->subdev_flags |= SDF_CMD_READ;
 570                 s->do_cmdtest = pcl711_ai_cmdtest;
 571                 s->do_cmd = pcl711_ai_cmd;
 572         }
 573
 574         s++;
 575         /* AO subdevice */
 576         s->type = COMEDI_SUBD_AO;
 577         s->subdev_flags = SDF_WRITABLE;
 578         s->n_chan = this_board->n_aochan;
 579         s->maxdata = 0xfff;
 580         s->len_chanlist = 1;
 581         s->range_table = &range_bipolar5;
 582         s->insn_write = pcl711_ao_insn;
 583         s->insn_read = pcl711_ao_insn_read;
 584
 585         s++;
 586         /* 16-bit digital input */
 587         s->type = COMEDI_SUBD_DI;
 588         s->subdev_flags = SDF_READABLE;
 589         s->n_chan = 16;
 590         s->maxdata = 1;
 591         s->len_chanlist = 16;
 592         s->range_table = &range_digital;
 593         s->insn_bits = pcl711_di_insn_bits;
 594
 595         s++;
 596         /* 16-bit digital out */
 597         s->type = COMEDI_SUBD_DO;
 598         s->subdev_flags = SDF_WRITABLE;
 599         s->n_chan = 16;
 600         s->maxdata = 1;
 601         s->len_chanlist = 16;
 602         s->range_table = &range_digital;
 603         s->state = 0;
 604         s->insn_bits = pcl711_do_insn_bits;
 605
 606         /*
 607            this is the "base value" for the mode register, which is
 608            used for the irq on the PCL711
 609          */
 610         if (this_board->is_pcl711b) {
 611                 devpriv->mode = (dev->irq << 4);
 612         }
 613
 614         /* clear DAC */
 615         outb(0, dev->iobase + PCL711_DA0_LO);
 616         outb(0, dev->iobase + PCL711_DA0_HI);
 617         outb(0, dev->iobase + PCL711_DA1_LO);
 618         outb(0, dev->iobase + PCL711_DA1_HI);
 619
 620         printk("\n");
 621
 622         return 0;
 623 }