drivers/staging/comedi/drivers/dmm32at.c

   1 /*
   2     comedi/drivers/dmm32at.c
   3     Diamond Systems mm32at 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: dmm32at
  25 Description: Diamond Systems mm32at driver.
  26 Devices:
  27 Author: Perry J. Piplani <perry.j.piplani@nasa.gov>
  28 Updated: Fri Jun  4 09:13:24 CDT 2004
  29 Status: experimental
  30
  31 This driver is for the Diamond Systems MM-32-AT board
  32 http://www.diamondsystems.com/products/diamondmm32at It is being used
  33 on serveral projects inside NASA, without problems so far. For analog
  34 input commands, TRIG_EXT is not yet supported at all..
  35
  36 Configuration Options:
  37   comedi_config /dev/comedi0 dmm32at baseaddr,irq
  38 */
  39
  40 #include <linux/interrupt.h>
  41 #include "../comedidev.h"
  42 #include <linux/ioport.h>
  43
  44 /* Board register addresses */
  45
  46 #define DMM32AT_MEMSIZE 0x10
  47
  48 #define DMM32AT_CONV 0x00
  49 #define DMM32AT_AILSB 0x00
  50 #define DMM32AT_AUXDOUT 0x01
  51 #define DMM32AT_AIMSB 0x01
  52 #define DMM32AT_AILOW 0x02
  53 #define DMM32AT_AIHIGH 0x03
  54
  55 #define DMM32AT_DACLSB 0x04
  56 #define DMM32AT_DACSTAT 0x04
  57 #define DMM32AT_DACMSB 0x05
  58
  59 #define DMM32AT_FIFOCNTRL 0x07
  60 #define DMM32AT_FIFOSTAT 0x07
  61
  62 #define DMM32AT_CNTRL 0x08
  63 #define DMM32AT_AISTAT 0x08
  64
  65 #define DMM32AT_INTCLOCK 0x09
  66
  67 #define DMM32AT_CNTRDIO 0x0a
  68
  69 #define DMM32AT_AICONF 0x0b
  70 #define DMM32AT_AIRBACK 0x0b
  71
  72 #define DMM32AT_CLK1 0x0d
  73 #define DMM32AT_CLK2 0x0e
  74 #define DMM32AT_CLKCT 0x0f
  75
  76 #define DMM32AT_DIOA 0x0c
  77 #define DMM32AT_DIOB 0x0d
  78 #define DMM32AT_DIOC 0x0e
  79 #define DMM32AT_DIOCONF 0x0f
  80
  81 #define dmm_inb(cdev, reg) inb((cdev->iobase)+reg)
  82 #define dmm_outb(cdev, reg, valu) outb(valu, (cdev->iobase)+reg)
  83
  84 /* Board register values. */
  85
  86 /* DMM32AT_DACSTAT 0x04 */
  87 #define DMM32AT_DACBUSY 0x80
  88
  89 /* DMM32AT_FIFOCNTRL 0x07 */
  90 #define DMM32AT_FIFORESET 0x02
  91 #define DMM32AT_SCANENABLE 0x04
  92
  93 /* DMM32AT_CNTRL 0x08 */
  94 #define DMM32AT_RESET 0x20
  95 #define DMM32AT_INTRESET 0x08
  96 #define DMM32AT_CLKACC 0x00
  97 #define DMM32AT_DIOACC 0x01
  98
  99 /* DMM32AT_AISTAT 0x08 */
 100 #define DMM32AT_STATUS 0x80
 101
 102 /* DMM32AT_INTCLOCK 0x09 */
 103 #define DMM32AT_ADINT 0x80
 104 #define DMM32AT_CLKSEL 0x03
 105
 106 /* DMM32AT_CNTRDIO 0x0a */
 107 #define DMM32AT_FREQ12 0x80
 108
 109 /* DMM32AT_AICONF 0x0b */
 110 #define DMM32AT_RANGE_U10 0x0c
 111 #define DMM32AT_RANGE_U5 0x0d
 112 #define DMM32AT_RANGE_B10 0x08
 113 #define DMM32AT_RANGE_B5 0x00
 114 #define DMM32AT_SCINT_20 0x00
 115 #define DMM32AT_SCINT_15 0x10
 116 #define DMM32AT_SCINT_10 0x20
 117 #define DMM32AT_SCINT_5 0x30
 118
 119 /* DMM32AT_CLKCT 0x0f */
 120 #define DMM32AT_CLKCT1 0x56     /* mode3 counter 1 - write low byte only */
 121 #define DMM32AT_CLKCT2 0xb6     /*  mode3 counter 2 - write high and low byte */
 122
 123 /* DMM32AT_DIOCONF 0x0f */
 124 #define DMM32AT_DIENABLE 0x80
 125 #define DMM32AT_DIRA 0x10
 126 #define DMM32AT_DIRB 0x02
 127 #define DMM32AT_DIRCL 0x01
 128 #define DMM32AT_DIRCH 0x08
 129
 130 /* board AI ranges in comedi structure */
 131 static const struct comedi_lrange dmm32at_airanges = {
 132         4,
 133         {
 134          UNI_RANGE(10),
 135          UNI_RANGE(5),
 136          BIP_RANGE(10),
 137          BIP_RANGE(5),
 138          }
 139 };
 140
 141 /* register values for above ranges */
 142 static const unsigned char dmm32at_rangebits[] = {
 143         DMM32AT_RANGE_U10,
 144         DMM32AT_RANGE_U5,
 145         DMM32AT_RANGE_B10,
 146         DMM32AT_RANGE_B5,
 147 };
 148
 149 /* only one of these ranges is valid, as set by a jumper on the
 150  * board. The application should only use the range set by the jumper
 151  */
 152 static const struct comedi_lrange dmm32at_aoranges = {
 153         4,
 154         {
 155          UNI_RANGE(10),
 156          UNI_RANGE(5),
 157          BIP_RANGE(10),
 158          BIP_RANGE(5),
 159          }
 160 };
 161
 162 /*
 163  * Board descriptions for two imaginary boards.  Describing the
 164  * boards in this way is optional, and completely driver-dependent.
 165  * Some drivers use arrays such as this, other do not.
 166  */
 167 struct dmm32at_board {
 168         const char *name;
 169         int ai_chans;
 170         int ai_bits;
 171         const struct comedi_lrange *ai_ranges;
 172         int ao_chans;
 173         int ao_bits;
 174         const struct comedi_lrange *ao_ranges;
 175         int have_dio;
 176         int dio_chans;
 177 };
 178 static const struct dmm32at_board dmm32at_boards[] = {
 179         {
 180          .name = "dmm32at",
 181          .ai_chans = 32,
 182          .ai_bits = 16,
 183          .ai_ranges = &dmm32at_airanges,
 184          .ao_chans = 4,
 185          .ao_bits = 12,
 186          .ao_ranges = &dmm32at_aoranges,
 187          .have_dio = 1,
 188          .dio_chans = 24,
 189          },
 190 };
 191
 192 /*
 193  * Useful for shorthand access to the particular board structure
 194  */
 195 #define thisboard ((const struct dmm32at_board *)dev->board_ptr)
 196
 197 /* this structure is for data unique to this hardware driver.  If
 198  * several hardware drivers keep similar information in this structure,
 199  * feel free to suggest moving the variable to the struct comedi_device struct.
 200  */
 201 struct dmm32at_private {
 202
 203         int data;
 204         int ai_inuse;
 205         unsigned int ai_scans_left;
 206
 207         /* Used for AO readback */
 208         unsigned int ao_readback[4];
 209         unsigned char dio_config;
 210
 211 };
 212
 213 /*
 214  * most drivers define the following macro to make it easy to
 215  * access the private structure.
 216  */
 217 #define devpriv ((struct dmm32at_private *)dev->private)
 218
 219 /*
 220  * The struct comedi_driver structure tells the Comedi core module
 221  * which functions to call to configure/deconfigure (attach/detach)
 222  * the board, and also about the kernel module that contains
 223  * the device code.
 224  */
 225 static int dmm32at_attach(struct comedi_device *dev,
 226                           struct comedi_devconfig *it);
 227 static int dmm32at_detach(struct comedi_device *dev);
 228 static struct comedi_driver driver_dmm32at = {
 229         .driver_name = "dmm32at",
 230         .module = THIS_MODULE,
 231         .attach = dmm32at_attach,
 232         .detach = dmm32at_detach,
 233 /* It is not necessary to implement the following members if you are
 234  * writing a driver for a ISA PnP or PCI card */
 235 /* Most drivers will support multiple types of boards by
 236  * having an array of board structures.  These were defined
 237  * in dmm32at_boards[] above.  Note that the element 'name'
 238  * was first in the structure -- Comedi uses this fact to
 239  * extract the name of the board without knowing any details
 240  * about the structure except for its length.
 241  * When a device is attached (by comedi_config), the name
 242  * of the device is given to Comedi, and Comedi tries to
 243  * match it by going through the list of board names.  If
 244  * there is a match, the address of the pointer is put
 245  * into dev->board_ptr and driver->attach() is called.
 246  *
 247  * Note that these are not necessary if you can determine
 248  * the type of board in software.  ISA PnP, PCI, and PCMCIA
 249  * devices are such boards.
 250  */
 251         .board_name = &dmm32at_boards[0].name,
 252         .offset = sizeof(struct dmm32at_board),
 253         .num_names = ARRAY_SIZE(dmm32at_boards),
 254 };
 255
 256 /* prototypes for driver functions below */
 257 static int dmm32at_ai_rinsn(struct comedi_device *dev,
 258                             struct comedi_subdevice *s,
 259                             struct comedi_insn *insn, unsigned int *data);
 260 static int dmm32at_ao_winsn(struct comedi_device *dev,
 261                             struct comedi_subdevice *s,
 262                             struct comedi_insn *insn, unsigned int *data);
 263 static int dmm32at_ao_rinsn(struct comedi_device *dev,
 264                             struct comedi_subdevice *s,
 265                             struct comedi_insn *insn, unsigned int *data);
 266 static int dmm32at_dio_insn_bits(struct comedi_device *dev,
 267                                  struct comedi_subdevice *s,
 268                                  struct comedi_insn *insn, unsigned int *data);
 269 static int dmm32at_dio_insn_config(struct comedi_device *dev,
 270                                    struct comedi_subdevice *s,
 271                                    struct comedi_insn *insn,
 272                                    unsigned int *data);
 273 static int dmm32at_ai_cmdtest(struct comedi_device *dev,
 274                               struct comedi_subdevice *s,
 275                               struct comedi_cmd *cmd);
 276 static int dmm32at_ai_cmd(struct comedi_device *dev,
 277                           struct comedi_subdevice *s);
 278 static int dmm32at_ai_cancel(struct comedi_device *dev,
 279                              struct comedi_subdevice *s);
 280 static int dmm32at_ns_to_timer(unsigned int *ns, int round);
 281 static irqreturn_t dmm32at_isr(int irq, void *d);
 282 void dmm32at_setaitimer(struct comedi_device *dev, unsigned int nansec);
 283
 284 /*
 285  * Attach is called by the Comedi core to configure the driver
 286  * for a particular board.  If you specified a board_name array
 287  * in the driver structure, dev->board_ptr contains that
 288  * address.
 289  */
 290 static int dmm32at_attach(struct comedi_device *dev,
 291                           struct comedi_devconfig *it)
 292 {
 293         int ret;
 294         struct comedi_subdevice *s;
 295         unsigned char aihi, ailo, fifostat, aistat, intstat, airback;
 296         unsigned long iobase;
 297         unsigned int irq;
 298
 299         iobase = it->options[0];
 300         irq = it->options[1];
 301
 302         printk("comedi%d: dmm32at: attaching\n", dev->minor);
 303         printk("dmm32at: probing at address 0x%04lx, irq %u\n", iobase, irq);
 304
 305         /* register address space */
 306         if (!request_region(iobase, DMM32AT_MEMSIZE, thisboard->name)) {
 307                 printk("I/O port conflict\n");
 308                 return -EIO;
 309         }
 310         dev->iobase = iobase;
 311
 312         /* the following just makes sure the board is there and gets
 313            it to a known state */
 314
 315         /* reset the board */
 316         dmm_outb(dev, DMM32AT_CNTRL, DMM32AT_RESET);
 317
 318         /* allow a millisecond to reset */
 319         udelay(1000);
 320
 321         /* zero scan and fifo control */
 322         dmm_outb(dev, DMM32AT_FIFOCNTRL, 0x0);
 323
 324         /* zero interrupt and clock control */
 325         dmm_outb(dev, DMM32AT_INTCLOCK, 0x0);
 326
 327         /* write a test channel range, the high 3 bits should drop */
 328         dmm_outb(dev, DMM32AT_AILOW, 0x80);
 329         dmm_outb(dev, DMM32AT_AIHIGH, 0xff);
 330
 331         /* set the range at 10v unipolar */
 332         dmm_outb(dev, DMM32AT_AICONF, DMM32AT_RANGE_U10);
 333
 334         /* should take 10 us to settle, here's a hundred */
 335         udelay(100);
 336
 337         /* read back the values */
 338         ailo = dmm_inb(dev, DMM32AT_AILOW);
 339         aihi = dmm_inb(dev, DMM32AT_AIHIGH);
 340         fifostat = dmm_inb(dev, DMM32AT_FIFOSTAT);
 341         aistat = dmm_inb(dev, DMM32AT_AISTAT);
 342         intstat = dmm_inb(dev, DMM32AT_INTCLOCK);
 343         airback = dmm_inb(dev, DMM32AT_AIRBACK);
 344
 345         printk("dmm32at: lo=0x%02x hi=0x%02x fifostat=0x%02x\n",
 346                ailo, aihi, fifostat);
 347         printk("dmm32at: aistat=0x%02x intstat=0x%02x airback=0x%02x\n",
 348                aistat, intstat, airback);
 349
 350         if ((ailo != 0x00) || (aihi != 0x1f) || (fifostat != 0x80) ||
 351             (aistat != 0x60 || (intstat != 0x00) || airback != 0x0c)) {
 352                 printk("dmmat32: board detection failed\n");
 353                 return -EIO;
 354         }
 355
 356         /* board is there, register interrupt */
 357         if (irq) {
 358                 ret = request_irq(irq, dmm32at_isr, 0, thisboard->name, dev);
 359                 if (ret < 0) {
 360                         printk("irq conflict\n");
 361                         return ret;
 362                 }
 363                 dev->irq = irq;
 364         }
 365
 366 /*
 367  * If you can probe the device to determine what device in a series
 368  * it is, this is the place to do it.  Otherwise, dev->board_ptr
 369  * should already be initialized.
 370  */
 371         /* dev->board_ptr = dmm32at_probe(dev); */
 372
 373 /*
 374  * Initialize dev->board_name.  Note that we can use the "thisboard"
 375  * macro now, since we just initialized it in the last line.
 376  */
 377         dev->board_name = thisboard->name;
 378
 379 /*
 380  * Allocate the private structure area.  alloc_private() is a
 381  * convenient macro defined in comedidev.h.
 382  */
 383         if (alloc_private(dev, sizeof(struct dmm32at_private)) < 0)
 384                 return -ENOMEM;
 385
 386 /*
 387  * Allocate the subdevice structures.  alloc_subdevice() is a
 388  * convenient macro defined in comedidev.h.
 389  */
 390         if (alloc_subdevices(dev, 3) < 0)
 391                 return -ENOMEM;
 392
 393         s = dev->subdevices + 0;
 394         dev->read_subdev = s;
 395         /* analog input subdevice */
 396         s->type = COMEDI_SUBD_AI;
 397         /* we support single-ended (ground) and differential */
 398         s->subdev_flags = SDF_READABLE | SDF_GROUND | SDF_DIFF | SDF_CMD_READ;
 399         s->n_chan = thisboard->ai_chans;
 400         s->maxdata = (1 << thisboard->ai_bits) - 1;
 401         s->range_table = thisboard->ai_ranges;
 402         s->len_chanlist = 32;   /* This is the maximum chanlist length that
 403                                    the board can handle */
 404         s->insn_read = dmm32at_ai_rinsn;
 405         s->do_cmd = dmm32at_ai_cmd;
 406         s->do_cmdtest = dmm32at_ai_cmdtest;
 407         s->cancel = dmm32at_ai_cancel;
 408
 409         s = dev->subdevices + 1;
 410         /* analog output subdevice */
 411         s->type = COMEDI_SUBD_AO;
 412         s->subdev_flags = SDF_WRITABLE;
 413         s->n_chan = thisboard->ao_chans;
 414         s->maxdata = (1 << thisboard->ao_bits) - 1;
 415         s->range_table = thisboard->ao_ranges;
 416         s->insn_write = dmm32at_ao_winsn;
 417         s->insn_read = dmm32at_ao_rinsn;
 418
 419         s = dev->subdevices + 2;
 420         /* digital i/o subdevice */
 421         if (thisboard->have_dio) {
 422
 423                 /* get access to the DIO regs */
 424                 dmm_outb(dev, DMM32AT_CNTRL, DMM32AT_DIOACC);
 425                 /* set the DIO's to the defualt input setting */
 426                 devpriv->dio_config = DMM32AT_DIRA | DMM32AT_DIRB |
 427                     DMM32AT_DIRCL | DMM32AT_DIRCH | DMM32AT_DIENABLE;
 428                 dmm_outb(dev, DMM32AT_DIOCONF, devpriv->dio_config);
 429
 430                 /* set up the subdevice */
 431                 s->type = COMEDI_SUBD_DIO;
 432                 s->subdev_flags = SDF_READABLE | SDF_WRITABLE;
 433                 s->n_chan = thisboard->dio_chans;
 434                 s->maxdata = 1;
 435                 s->state = 0;
 436                 s->range_table = &range_digital;
 437                 s->insn_bits = dmm32at_dio_insn_bits;
 438                 s->insn_config = dmm32at_dio_insn_config;
 439         } else {
 440                 s->type = COMEDI_SUBD_UNUSED;
 441         }
 442
 443         /* success */
 444         printk("comedi%d: dmm32at: attached\n", dev->minor);
 445
 446         return 1;
 447
 448 }
 449
 450 /*
 451  * _detach is called to deconfigure a device.  It should deallocate
 452  * resources.
 453  * This function is also called when _attach() fails, so it should be
 454  * careful not to release resources that were not necessarily
 455  * allocated by _attach().  dev->private and dev->subdevices are
 456  * deallocated automatically by the core.
 457  */
 458 static int dmm32at_detach(struct comedi_device *dev)
 459 {
 460         printk("comedi%d: dmm32at: remove\n", dev->minor);
 461         if (dev->irq)
 462                 free_irq(dev->irq, dev);
 463         if (dev->iobase)
 464                 release_region(dev->iobase, DMM32AT_MEMSIZE);
 465
 466         return 0;
 467 }
 468
 469 /*
 470  * "instructions" read/write data in "one-shot" or "software-triggered"
 471  * mode.
 472  */
 473
 474 static int dmm32at_ai_rinsn(struct comedi_device *dev,
 475                             struct comedi_subdevice *s,
 476                             struct comedi_insn *insn, unsigned int *data)
 477 {
 478         int n, i;
 479         unsigned int d;
 480         unsigned char status;
 481         unsigned short msb, lsb;
 482         unsigned char chan;
 483         int range;
 484
 485         /* get the channel and range number */
 486
 487         chan = CR_CHAN(insn->chanspec) & (s->n_chan - 1);
 488         range = CR_RANGE(insn->chanspec);
 489
 490         /* printk("channel=0x%02x, range=%d\n",chan,range); */
 491
 492         /* zero scan and fifo control and reset fifo */
 493         dmm_outb(dev, DMM32AT_FIFOCNTRL, DMM32AT_FIFORESET);
 494
 495         /* write the ai channel range regs */
 496         dmm_outb(dev, DMM32AT_AILOW, chan);
 497         dmm_outb(dev, DMM32AT_AIHIGH, chan);
 498         /* set the range bits */
 499         dmm_outb(dev, DMM32AT_AICONF, dmm32at_rangebits[range]);
 500
 501         /* wait for circuit to settle */
 502         for (i = 0; i < 40000; i++) {
 503                 status = dmm_inb(dev, DMM32AT_AIRBACK);
 504                 if ((status & DMM32AT_STATUS) == 0)
 505                         break;
 506         }
 507         if (i == 40000) {
 508                 printk("timeout\n");
 509                 return -ETIMEDOUT;
 510         }
 511
 512         /* convert n samples */
 513         for (n = 0; n < insn->n; n++) {
 514                 /* trigger conversion */
 515                 dmm_outb(dev, DMM32AT_CONV, 0xff);
 516                 /* wait for conversion to end */
 517                 for (i = 0; i < 40000; i++) {
 518                         status = dmm_inb(dev, DMM32AT_AISTAT);
 519                         if ((status & DMM32AT_STATUS) == 0)
 520                                 break;
 521                 }
 522                 if (i == 40000) {
 523                         printk("timeout\n");
 524                         return -ETIMEDOUT;
 525                 }
 526
 527                 /* read data */
 528                 lsb = dmm_inb(dev, DMM32AT_AILSB);
 529                 msb = dmm_inb(dev, DMM32AT_AIMSB);
 530
 531                 /* invert sign bit to make range unsigned, this is an
 532                    idiosyncracy of the diamond board, it return
 533                    conversions as a signed value, i.e. -32768 to
 534                    32767, flipping the bit and interpreting it as
 535                    signed gives you a range of 0 to 65535 which is
 536                    used by comedi */
 537                 d = ((msb ^ 0x0080) << 8) + lsb;
 538
 539                 data[n] = d;
 540         }
 541
 542         /* return the number of samples read/written */
 543         return n;
 544 }
 545
 546 static int dmm32at_ai_cmdtest(struct comedi_device *dev,
 547                               struct comedi_subdevice *s,
 548                               struct comedi_cmd *cmd)
 549 {
 550         int err = 0;
 551         int tmp;
 552         int start_chan, gain, i;
 553
 554         /* printk("dmmat32 in command test\n"); */
 555
 556         /* cmdtest tests a particular command to see if it is valid.
 557          * Using the cmdtest ioctl, a user can create a valid cmd
 558          * and then have it executes by the cmd ioctl.
 559          *
 560          * cmdtest returns 1,2,3,4 or 0, depending on which tests
 561          * the command passes. */
 562
 563         /* step 1: make sure trigger sources are trivially valid */
 564
 565         tmp = cmd->start_src;
 566         cmd->start_src &= TRIG_NOW;
 567         if (!cmd->start_src || tmp != cmd->start_src)
 568                 err++;
 569
 570         tmp = cmd->scan_begin_src;
 571         cmd->scan_begin_src &= TRIG_TIMER /*| TRIG_EXT */ ;
 572         if (!cmd->scan_begin_src || tmp != cmd->scan_begin_src)
 573                 err++;
 574
 575         tmp = cmd->convert_src;
 576         cmd->convert_src &= TRIG_TIMER /*| TRIG_EXT */ ;
 577         if (!cmd->convert_src || tmp != cmd->convert_src)
 578                 err++;
 579
 580         tmp = cmd->scan_end_src;
 581         cmd->scan_end_src &= TRIG_COUNT;
 582         if (!cmd->scan_end_src || tmp != cmd->scan_end_src)
 583                 err++;
 584
 585         tmp = cmd->stop_src;
 586         cmd->stop_src &= TRIG_COUNT | TRIG_NONE;
 587         if (!cmd->stop_src || tmp != cmd->stop_src)
 588                 err++;
 589
 590         if (err)
 591                 return 1;
 592
 593         /* step 2: make sure trigger sources are unique and mutually compatible */
 594
 595         /* note that mutual compatibility is not an issue here */
 596         if (cmd->scan_begin_src != TRIG_TIMER &&
 597             cmd->scan_begin_src != TRIG_EXT)
 598                 err++;
 599         if (cmd->convert_src != TRIG_TIMER && cmd->convert_src != TRIG_EXT)
 600                 err++;
 601         if (cmd->stop_src != TRIG_COUNT && cmd->stop_src != TRIG_NONE)
 602                 err++;
 603
 604         if (err)
 605                 return 2;
 606
 607         /* step 3: make sure arguments are trivially compatible */
 608
 609         if (cmd->start_arg != 0) {
 610                 cmd->start_arg = 0;
 611                 err++;
 612         }
 613 #define MAX_SCAN_SPEED  1000000 /* in nanoseconds */
 614 #define MIN_SCAN_SPEED  1000000000      /* in nanoseconds */
 615
 616         if (cmd->scan_begin_src == TRIG_TIMER) {
 617                 if (cmd->scan_begin_arg < MAX_SCAN_SPEED) {
 618                         cmd->scan_begin_arg = MAX_SCAN_SPEED;
 619                         err++;
 620                 }
 621                 if (cmd->scan_begin_arg > MIN_SCAN_SPEED) {
 622                         cmd->scan_begin_arg = MIN_SCAN_SPEED;
 623                         err++;
 624                 }
 625         } else {
 626                 /* external trigger */
 627                 /* should be level/edge, hi/lo specification here */
 628                 /* should specify multiple external triggers */
 629                 if (cmd->scan_begin_arg > 9) {
 630                         cmd->scan_begin_arg = 9;
 631                         err++;
 632                 }
 633         }
 634         if (cmd->convert_src == TRIG_TIMER) {
 635                 if (cmd->convert_arg >= 17500)
 636                         cmd->convert_arg = 20000;
 637                 else if (cmd->convert_arg >= 12500)
 638                         cmd->convert_arg = 15000;
 639                 else if (cmd->convert_arg >= 7500)
 640                         cmd->convert_arg = 10000;
 641                 else
 642                         cmd->convert_arg = 5000;
 643
 644         } else {
 645                 /* external trigger */
 646                 /* see above */
 647                 if (cmd->convert_arg > 9) {
 648                         cmd->convert_arg = 9;
 649                         err++;
 650                 }
 651         }
 652
 653         if (cmd->scan_end_arg != cmd->chanlist_len) {
 654                 cmd->scan_end_arg = cmd->chanlist_len;
 655                 err++;
 656         }
 657         if (cmd->stop_src == TRIG_COUNT) {
 658                 if (cmd->stop_arg > 0xfffffff0) {
 659                         cmd->stop_arg = 0xfffffff0;
 660                         err++;
 661                 }
 662                 if (cmd->stop_arg == 0) {
 663                         cmd->stop_arg = 1;
 664                         err++;
 665                 }
 666         } else {
 667                 /* TRIG_NONE */
 668                 if (cmd->stop_arg != 0) {
 669                         cmd->stop_arg = 0;
 670                         err++;
 671                 }
 672         }
 673
 674         if (err)
 675                 return 3;
 676
 677         /* step 4: fix up any arguments */
 678
 679         if (cmd->scan_begin_src == TRIG_TIMER) {
 680                 tmp = cmd->scan_begin_arg;
 681                 dmm32at_ns_to_timer(&cmd->scan_begin_arg,
 682                                     cmd->flags & TRIG_ROUND_MASK);
 683                 if (tmp != cmd->scan_begin_arg)
 684                         err++;
 685         }
 686         if (cmd->convert_src == TRIG_TIMER) {
 687                 tmp = cmd->convert_arg;
 688                 dmm32at_ns_to_timer(&cmd->convert_arg,
 689                                     cmd->flags & TRIG_ROUND_MASK);
 690                 if (tmp != cmd->convert_arg)
 691                         err++;
 692                 if (cmd->scan_begin_src == TRIG_TIMER &&
 693                     cmd->scan_begin_arg <
 694                     cmd->convert_arg * cmd->scan_end_arg) {
 695                         cmd->scan_begin_arg =
 696                             cmd->convert_arg * cmd->scan_end_arg;
 697                         err++;
 698                 }
 699         }
 700
 701         if (err)
 702                 return 4;
 703
 704         /* step 5 check the channel list, the channel list for this
 705            board must be consecutive and gains must be the same */
 706
 707         if (cmd->chanlist) {
 708                 gain = CR_RANGE(cmd->chanlist[0]);
 709                 start_chan = CR_CHAN(cmd->chanlist[0]);
 710                 for (i = 1; i < cmd->chanlist_len; i++) {
 711                         if (CR_CHAN(cmd->chanlist[i]) !=
 712                             (start_chan + i) % s->n_chan) {
 713                                 comedi_error(dev,
 714                                              "entries in chanlist must be consecutive channels, counting upwards\n");
 715                                 err++;
 716                         }
 717                         if (CR_RANGE(cmd->chanlist[i]) != gain) {
 718                                 comedi_error(dev,
 719                                              "entries in chanlist must all have the same gain\n");
 720                                 err++;
 721                         }
 722                 }
 723         }
 724
 725         if (err)
 726                 return 5;
 727
 728         return 0;
 729 }
 730
 731 static int dmm32at_ai_cmd(struct comedi_device *dev, struct comedi_subdevice *s)
 732 {
 733         struct comedi_cmd *cmd = &s->async->cmd;
 734         int i, range;
 735         unsigned char chanlo, chanhi, status;
 736
 737         if (!cmd->chanlist)
 738                 return -EINVAL;
 739
 740         /* get the channel list and range */
 741         chanlo = CR_CHAN(cmd->chanlist[0]) & (s->n_chan - 1);
 742         chanhi = chanlo + cmd->chanlist_len - 1;
 743         if (chanhi >= s->n_chan)
 744                 return -EINVAL;
 745         range = CR_RANGE(cmd->chanlist[0]);
 746
 747         /* reset fifo */
 748         dmm_outb(dev, DMM32AT_FIFOCNTRL, DMM32AT_FIFORESET);
 749
 750         /* set scan enable */
 751         dmm_outb(dev, DMM32AT_FIFOCNTRL, DMM32AT_SCANENABLE);
 752
 753         /* write the ai channel range regs */
 754         dmm_outb(dev, DMM32AT_AILOW, chanlo);
 755         dmm_outb(dev, DMM32AT_AIHIGH, chanhi);
 756
 757         /* set the range bits */
 758         dmm_outb(dev, DMM32AT_AICONF, dmm32at_rangebits[range]);
 759
 760         /* reset the interrupt just in case */
 761         dmm_outb(dev, DMM32AT_CNTRL, DMM32AT_INTRESET);
 762
 763         if (cmd->stop_src == TRIG_COUNT)
 764                 devpriv->ai_scans_left = cmd->stop_arg;
 765         else {                  /* TRIG_NONE */
 766                 devpriv->ai_scans_left = 0xffffffff;    /* indicates TRIG_NONE to isr */
 767         }
 768
 769         /* wait for circuit to settle */
 770         for (i = 0; i < 40000; i++) {
 771                 status = dmm_inb(dev, DMM32AT_AIRBACK);
 772                 if ((status & DMM32AT_STATUS) == 0)
 773                         break;
 774         }
 775         if (i == 40000) {
 776                 printk("timeout\n");
 777                 return -ETIMEDOUT;
 778         }
 779
 780         if (devpriv->ai_scans_left > 1) {
 781                 /* start the clock and enable the interrupts */
 782                 dmm32at_setaitimer(dev, cmd->scan_begin_arg);
 783         } else {
 784                 /* start the interrups and initiate a single scan */
 785                 dmm_outb(dev, DMM32AT_INTCLOCK, DMM32AT_ADINT);
 786                 dmm_outb(dev, DMM32AT_CONV, 0xff);
 787         }
 788
 789 /*      printk("dmmat32 in command\n"); */
 790
 791 /*      for(i=0;i<cmd->chanlist_len;i++) */
 792 /*              comedi_buf_put(s->async,i*100); */
 793
 794 /*      s->async->events |= COMEDI_CB_EOA; */
 795 /*      comedi_event(dev, s); */
 796
 797         return 0;
 798
 799 }
 800
 801 static int dmm32at_ai_cancel(struct comedi_device *dev,
 802                              struct comedi_subdevice *s)
 803 {
 804         devpriv->ai_scans_left = 1;
 805         return 0;
 806 }
 807
 808 static irqreturn_t dmm32at_isr(int irq, void *d)
 809 {
 810         unsigned char intstat;
 811         unsigned int samp;
 812         unsigned short msb, lsb;
 813         int i;
 814         struct comedi_device *dev = d;
 815
 816         if (!dev->attached) {
 817                 comedi_error(dev, "spurious interrupt");
 818                 return IRQ_HANDLED;
 819         }
 820
 821         intstat = dmm_inb(dev, DMM32AT_INTCLOCK);
 822
 823         if (intstat & DMM32AT_ADINT) {
 824                 struct comedi_subdevice *s = dev->read_subdev;
 825                 struct comedi_cmd *cmd = &s->async->cmd;
 826
 827                 for (i = 0; i < cmd->chanlist_len; i++) {
 828                         /* read data */
 829                         lsb = dmm_inb(dev, DMM32AT_AILSB);
 830                         msb = dmm_inb(dev, DMM32AT_AIMSB);
 831
 832                         /* invert sign bit to make range unsigned */
 833                         samp = ((msb ^ 0x0080) << 8) + lsb;
 834                         comedi_buf_put(s->async, samp);
 835                 }
 836
 837                 if (devpriv->ai_scans_left != 0xffffffff) {     /* TRIG_COUNT */
 838                         devpriv->ai_scans_left--;
 839                         if (devpriv->ai_scans_left == 0) {
 840                                 /* disable further interrupts and clocks */
 841                                 dmm_outb(dev, DMM32AT_INTCLOCK, 0x0);
 842                                 /* set the buffer to be flushed with an EOF */
 843                                 s->async->events |= COMEDI_CB_EOA;
 844                         }
 845
 846                 }
 847                 /* flush the buffer */
 848                 comedi_event(dev, s);
 849         }
 850
 851         /* reset the interrupt */
 852         dmm_outb(dev, DMM32AT_CNTRL, DMM32AT_INTRESET);
 853         return IRQ_HANDLED;
 854 }
 855
 856 /* This function doesn't require a particular form, this is just
 857  * what happens to be used in some of the drivers.  It should
 858  * convert ns nanoseconds to a counter value suitable for programming
 859  * the device.  Also, it should adjust ns so that it cooresponds to
 860  * the actual time that the device will use. */
 861 static int dmm32at_ns_to_timer(unsigned int *ns, int round)
 862 {
 863         /* trivial timer */
 864         /* if your timing is done through two cascaded timers, the
 865          * i8253_cascade_ns_to_timer() function in 8253.h can be
 866          * very helpful.  There are also i8254_load() and i8254_mm_load()
 867          * which can be used to load values into the ubiquitous 8254 counters
 868          */
 869
 870         return *ns;
 871 }
 872
 873 static int dmm32at_ao_winsn(struct comedi_device *dev,
 874                             struct comedi_subdevice *s,
 875                             struct comedi_insn *insn, unsigned int *data)
 876 {
 877         int i;
 878         int chan = CR_CHAN(insn->chanspec);
 879         unsigned char hi, lo, status;
 880
 881         /* Writing a list of values to an AO channel is probably not
 882          * very useful, but that's how the interface is defined. */
 883         for (i = 0; i < insn->n; i++) {
 884
 885                 devpriv->ao_readback[chan] = data[i];
 886
 887                 /* get the low byte */
 888                 lo = data[i] & 0x00ff;
 889                 /* high byte also contains channel number */
 890                 hi = (data[i] >> 8) + chan * (1 << 6);
 891                 /* printk("writing 0x%02x  0x%02x\n",hi,lo); */
 892                 /* write the low and high values to the board */
 893                 dmm_outb(dev, DMM32AT_DACLSB, lo);
 894                 dmm_outb(dev, DMM32AT_DACMSB, hi);
 895
 896                 /* wait for circuit to settle */
 897                 for (i = 0; i < 40000; i++) {
 898                         status = dmm_inb(dev, DMM32AT_DACSTAT);
 899                         if ((status & DMM32AT_DACBUSY) == 0)
 900                                 break;
 901                 }
 902                 if (i == 40000) {
 903                         printk("timeout\n");
 904                         return -ETIMEDOUT;
 905                 }
 906                 /* dummy read to update trigger the output */
 907                 status = dmm_inb(dev, DMM32AT_DACMSB);
 908
 909         }
 910
 911         /* return the number of samples read/written */
 912         return i;
 913 }
 914
 915 /* AO subdevices should have a read insn as well as a write insn.
 916  * Usually this means copying a value stored in devpriv. */
 917 static int dmm32at_ao_rinsn(struct comedi_device *dev,
 918                             struct comedi_subdevice *s,
 919                             struct comedi_insn *insn, unsigned int *data)
 920 {
 921         int i;
 922         int chan = CR_CHAN(insn->chanspec);
 923
 924         for (i = 0; i < insn->n; i++)
 925                 data[i] = devpriv->ao_readback[chan];
 926
 927         return i;
 928 }
 929
 930 /* DIO devices are slightly special.  Although it is possible to
 931  * implement the insn_read/insn_write interface, it is much more
 932  * useful to applications if you implement the insn_bits interface.
 933  * This allows packed reading/writing of the DIO channels.  The
 934  * comedi core can convert between insn_bits and insn_read/write */
 935 static int dmm32at_dio_insn_bits(struct comedi_device *dev,
 936                                  struct comedi_subdevice *s,
 937                                  struct comedi_insn *insn, unsigned int *data)
 938 {
 939         unsigned char diobits;
 940
 941         if (insn->n != 2)
 942                 return -EINVAL;
 943
 944         /* The insn data is a mask in data[0] and the new data
 945          * in data[1], each channel cooresponding to a bit. */
 946         if (data[0]) {
 947                 s->state &= ~data[0];
 948                 s->state |= data[0] & data[1];
 949                 /* Write out the new digital output lines */
 950                 /* outw(s->state,dev->iobase + DMM32AT_DIO); */
 951         }
 952
 953         /* get access to the DIO regs */
 954         dmm_outb(dev, DMM32AT_CNTRL, DMM32AT_DIOACC);
 955
 956         /* if either part of dio is set for output */
 957         if (((devpriv->dio_config & DMM32AT_DIRCL) == 0) ||
 958             ((devpriv->dio_config & DMM32AT_DIRCH) == 0)) {
 959                 diobits = (s->state & 0x00ff0000) >> 16;
 960                 dmm_outb(dev, DMM32AT_DIOC, diobits);
 961         }
 962         if ((devpriv->dio_config & DMM32AT_DIRB) == 0) {
 963                 diobits = (s->state & 0x0000ff00) >> 8;
 964                 dmm_outb(dev, DMM32AT_DIOB, diobits);
 965         }
 966         if ((devpriv->dio_config & DMM32AT_DIRA) == 0) {
 967                 diobits = (s->state & 0x000000ff);
 968                 dmm_outb(dev, DMM32AT_DIOA, diobits);
 969         }
 970
 971         /* now read the state back in */
 972         s->state = dmm_inb(dev, DMM32AT_DIOC);
 973         s->state <<= 8;
 974         s->state |= dmm_inb(dev, DMM32AT_DIOB);
 975         s->state <<= 8;
 976         s->state |= dmm_inb(dev, DMM32AT_DIOA);
 977         data[1] = s->state;
 978
 979         /* on return, data[1] contains the value of the digital
 980          * input and output lines. */
 981         /* data[1]=inw(dev->iobase + DMM32AT_DIO); */
 982         /* or we could just return the software copy of the output values if
 983          * it was a purely digital output subdevice */
 984         /* data[1]=s->state; */
 985
 986         return 2;
 987 }
 988
 989 static int dmm32at_dio_insn_config(struct comedi_device *dev,
 990                                    struct comedi_subdevice *s,
 991                                    struct comedi_insn *insn, unsigned int *data)
 992 {
 993         unsigned char chanbit;
 994         int chan = CR_CHAN(insn->chanspec);
 995
 996         if (insn->n != 1)
 997                 return -EINVAL;
 998
 999         if (chan < 8)
1000                 chanbit = DMM32AT_DIRA;
1001         else if (chan < 16)
1002                 chanbit = DMM32AT_DIRB;
1003         else if (chan < 20)
1004                 chanbit = DMM32AT_DIRCL;
1005         else
1006                 chanbit = DMM32AT_DIRCH;
1007
1008         /* The input or output configuration of each digital line is
1009          * configured by a special insn_config instruction.  chanspec
1010          * contains the channel to be changed, and data[0] contains the
1011          * value COMEDI_INPUT or COMEDI_OUTPUT. */
1012
1013         /* if output clear the bit, otherwise set it */
1014         if (data[0] == COMEDI_OUTPUT)
1015                 devpriv->dio_config &= ~chanbit;
1016         else
1017                 devpriv->dio_config |= chanbit;
1018         /* get access to the DIO regs */
1019         dmm_outb(dev, DMM32AT_CNTRL, DMM32AT_DIOACC);
1020         /* set the DIO's to the new configuration setting */
1021         dmm_outb(dev, DMM32AT_DIOCONF, devpriv->dio_config);
1022
1023         return 1;
1024 }
1025
1026 void dmm32at_setaitimer(struct comedi_device *dev, unsigned int nansec)
1027 {
1028         unsigned char lo1, lo2, hi2;
1029         unsigned short both2;
1030
1031         /* based on 10mhz clock */
1032         lo1 = 200;
1033         both2 = nansec / 20000;
1034         hi2 = (both2 & 0xff00) >> 8;
1035         lo2 = both2 & 0x00ff;
1036
1037         /* set the counter frequency to 10mhz */
1038         dmm_outb(dev, DMM32AT_CNTRDIO, 0);
1039
1040         /* get access to the clock regs */
1041         dmm_outb(dev, DMM32AT_CNTRL, DMM32AT_CLKACC);
1042
1043         /* write the counter 1 control word and low byte to counter */
1044         dmm_outb(dev, DMM32AT_CLKCT, DMM32AT_CLKCT1);
1045         dmm_outb(dev, DMM32AT_CLK1, lo1);
1046
1047         /* write the counter 2 control word and low byte then to counter */
1048         dmm_outb(dev, DMM32AT_CLKCT, DMM32AT_CLKCT2);
1049         dmm_outb(dev, DMM32AT_CLK2, lo2);
1050         dmm_outb(dev, DMM32AT_CLK2, hi2);
1051
1052         /* enable the ai conversion interrupt and the clock to start scans */
1053         dmm_outb(dev, DMM32AT_INTCLOCK, DMM32AT_ADINT | DMM32AT_CLKSEL);
1054
1055 }
1056
1057 /*
1058  * A convenient macro that defines init_module() and cleanup_module(),
1059  * as necessary.
1060  */
1061 static int __init driver_dmm32at_init_module(void)
1062 {
1063         return comedi_driver_register(&driver_dmm32at);
1064 }
1065
1066 static void __exit driver_dmm32at_cleanup_module(void)
1067 {
1068         comedi_driver_unregister(&driver_dmm32at);
1069 }
1070
1071 module_init(driver_dmm32at_init_module);
1072 module_exit(driver_dmm32at_cleanup_module);
1073
1074 MODULE_AUTHOR("Comedi http://www.comedi.org");
1075 MODULE_DESCRIPTION("Comedi low-level driver");
1076 MODULE_LICENSE("GPL");