drivers/staging/comedi/drivers/das16.c

   1 /*
   2     comedi/drivers/das16.c
   3     DAS16 driver
   4
   5     COMEDI - Linux Control and Measurement Device Interface
   6     Copyright (C) 2000 David A. Schleef <ds@schleef.org>
   7     Copyright (C) 2000 Chris R. Baugher <baugher@enteract.com>
   8     Copyright (C) 2001,2002 Frank Mori Hess <fmhess@users.sourceforge.net>
   9
  10     This program is free software; you can redistribute it and/or modify
  11     it under the terms of the GNU General Public License as published by
  12     the Free Software Foundation; either version 2 of the License, or
  13     (at your option) any later version.
  14
  15     This program is distributed in the hope that it will be useful,
  16     but WITHOUT ANY WARRANTY; without even the implied warranty of
  17     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  18     GNU General Public License for more details.
  19
  20     You should have received a copy of the GNU General Public License
  21     along with this program; if not, write to the Free Software
  22     Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  23
  24 ************************************************************************
  25 */
  26 /*
  27 Driver: das16
  28 Description: DAS16 compatible boards
  29 Author: Sam Moore, Warren Jasper, ds, Chris Baugher, Frank Hess, Roman Fietze
  30 Devices: [Keithley Metrabyte] DAS-16 (das-16), DAS-16G (das-16g),
  31   DAS-16F (das-16f), DAS-1201 (das-1201), DAS-1202 (das-1202),
  32   DAS-1401 (das-1401), DAS-1402 (das-1402), DAS-1601 (das-1601),
  33   DAS-1602 (das-1602),
  34   [ComputerBoards] PC104-DAS16/JR (pc104-das16jr),
  35   PC104-DAS16JR/16 (pc104-das16jr/16),
  36   CIO-DAS16JR/16 (cio-das16jr/16),
  37   CIO-DAS16/JR (cio-das16/jr), CIO-DAS1401/12 (cio-das1401/12),
  38   CIO-DAS1402/12 (cio-das1402/12), CIO-DAS1402/16 (cio-das1402/16),
  39   CIO-DAS1601/12 (cio-das1601/12), CIO-DAS1602/12 (cio-das1602/12),
  40   CIO-DAS1602/16 (cio-das1602/16), CIO-DAS16/330 (cio-das16/330)
  41 Status: works
  42 Updated: 2003-10-12
  43
  44 A rewrite of the das16 and das1600 drivers.
  45 Options:
  46         [0] - base io address
  47         [1] - irq (does nothing, irq is not used anymore)
  48         [2] - dma (optional, required for comedi_command support)
  49         [3] - master clock speed in MHz (optional, 1 or 10, ignored if
  50                 board can probe clock, defaults to 1)
  51         [4] - analog input range lowest voltage in microvolts (optional,
  52                 only useful if your board does not have software
  53                 programmable gain)
  54         [5] - analog input range highest voltage in microvolts (optional,
  55                 only useful if board does not have software programmable
  56                 gain)
  57         [6] - analog output range lowest voltage in microvolts (optional)
  58         [7] - analog output range highest voltage in microvolts (optional)
  59         [8] - use timer mode for DMA.  Timer mode is needed e.g. for
  60                 buggy DMA controllers in NS CS5530A (Geode Companion), and for
  61                 'jr' cards that lack a hardware fifo.  This option is no
  62                 longer needed, since timer mode is _always_ used.
  63
  64 Passing a zero for an option is the same as leaving it unspecified.
  65
  66 */
  67 /*
  68
  69 Testing and debugging help provided by Daniel Koch.
  70
  71 Keithley Manuals:
  72         2309.PDF (das16)
  73         4919.PDF (das1400, 1600)
  74         4922.PDF (das-1400)
  75         4923.PDF (das1200, 1400, 1600)
  76
  77 Computer boards manuals also available from their website
  78 www.measurementcomputing.com
  79
  80 */
  81
  82 #include <linux/pci.h>
  83 #include <linux/slab.h>
  84 #include <linux/interrupt.h>
  85 #include <asm/dma.h>
  86 #include "../comedidev.h"
  87
  88 #include "8253.h"
  89 #include "8255.h"
  90 #include "comedi_fc.h"
  91
  92 #undef DEBUG
  93 /* #define DEBUG */
  94
  95 #ifdef DEBUG
  96 #define DEBUG_PRINT(format, args...)    \
  97         printk(KERN_DEBUG "das16: " format, ## args)
  98 #else
  99 #define DEBUG_PRINT(format, args...)
 100 #endif
 101
 102 #define DAS16_SIZE 20           /*  number of ioports */
 103 #define DAS16_DMA_SIZE 0xff00   /*  size in bytes of allocated dma buffer */
 104
 105 /*
 106     cio-das16.pdf
 107
 108     "das16"
 109     "das16/f"
 110
 111   0     a/d bits 0-3            start 12 bit
 112   1     a/d bits 4-11           unused
 113   2     mux read                mux set
 114   3     di 4 bit                do 4 bit
 115   4     unused                  ao0_lsb
 116   5     unused                  ao0_msb
 117   6     unused                  ao1_lsb
 118   7     unused                  ao1_msb
 119   8     status eoc uni/bip      interrupt reset
 120   9     dma, int, trig ctrl     set dma, int
 121   a     pacer control           unused
 122   b     reserved                reserved
 123   cdef  8254
 124   0123  8255
 125
 126 */
 127
 128 /*
 129     cio-das16jr.pdf
 130
 131     "das16jr"
 132
 133   0     a/d bits 0-3            start 12 bit
 134   1     a/d bits 4-11           unused
 135   2     mux read                mux set
 136   3     di 4 bit                do 4 bit
 137   4567  unused                  unused
 138   8     status eoc uni/bip      interrupt reset
 139   9     dma, int, trig ctrl     set dma, int
 140   a     pacer control           unused
 141   b     gain status             gain control
 142   cdef  8254
 143
 144 */
 145
 146 /*
 147     cio-das16jr_16.pdf
 148
 149     "das16jr_16"
 150
 151   0     a/d bits 0-7            start 16 bit
 152   1     a/d bits 8-15           unused
 153   2     mux read                mux set
 154   3     di 4 bit                do 4 bit
 155   4567  unused                  unused
 156   8     status eoc uni/bip      interrupt reset
 157   9     dma, int, trig ctrl     set dma, int
 158   a     pacer control           unused
 159   b     gain status             gain control
 160   cdef  8254
 161
 162 */
 163 /*
 164     cio-das160x-1x.pdf
 165
 166     "das1601/12"
 167     "das1602/12"
 168     "das1602/16"
 169
 170   0     a/d bits 0-3            start 12 bit
 171   1     a/d bits 4-11           unused
 172   2     mux read                mux set
 173   3     di 4 bit                do 4 bit
 174   4     unused                  ao0_lsb
 175   5     unused                  ao0_msb
 176   6     unused                  ao1_lsb
 177   7     unused                  ao1_msb
 178   8     status eoc uni/bip      interrupt reset
 179   9     dma, int, trig ctrl     set dma, int
 180   a     pacer control           unused
 181   b     gain status             gain control
 182   cdef  8254
 183   400   8255
 184   404   unused                  conversion enable
 185   405   unused                  burst enable
 186   406   unused                  das1600 enable
 187   407   status
 188
 189 */
 190
 191 /*  size in bytes of a sample from board */
 192 static const int sample_size = 2;
 193
 194 #define DAS16_TRIG              0
 195 #define DAS16_AI_LSB            0
 196 #define DAS16_AI_MSB            1
 197 #define DAS16_MUX               2
 198 #define DAS16_DIO               3
 199 #define DAS16_AO_LSB(x) ((x) ? 6 : 4)
 200 #define DAS16_AO_MSB(x) ((x) ? 7 : 5)
 201 #define DAS16_STATUS            8
 202 #define   BUSY                  (1<<7)
 203 #define   UNIPOLAR                      (1<<6)
 204 #define   DAS16_MUXBIT                  (1<<5)
 205 #define   DAS16_INT                     (1<<4)
 206 #define DAS16_CONTROL           9
 207 #define   DAS16_INTE                    (1<<7)
 208 #define   DAS16_IRQ(x)                  (((x) & 0x7) << 4)
 209 #define   DMA_ENABLE                    (1<<2)
 210 #define   PACING_MASK   0x3
 211 #define   INT_PACER             0x03
 212 #define   EXT_PACER                     0x02
 213 #define   DAS16_SOFT            0x00
 214 #define DAS16_PACER             0x0A
 215 #define   DAS16_CTR0                    (1<<1)
 216 #define   DAS16_TRIG0                   (1<<0)
 217 #define   BURST_LEN_BITS(x)                     (((x) & 0xf) << 4)
 218 #define DAS16_GAIN              0x0B
 219 #define DAS16_CNTR0_DATA                0x0C
 220 #define DAS16_CNTR1_DATA                0x0D
 221 #define DAS16_CNTR2_DATA                0x0E
 222 #define DAS16_CNTR_CONTROL      0x0F
 223 #define   DAS16_TERM_CNT        0x00
 224 #define   DAS16_ONE_SHOT        0x02
 225 #define   DAS16_RATE_GEN        0x04
 226 #define   DAS16_CNTR_LSB_MSB    0x30
 227 #define   DAS16_CNTR0           0x00
 228 #define   DAS16_CNTR1           0x40
 229 #define   DAS16_CNTR2           0x80
 230
 231 #define DAS1600_CONV            0x404
 232 #define   DAS1600_CONV_DISABLE          0x40
 233 #define DAS1600_BURST           0x405
 234 #define   DAS1600_BURST_VAL             0x40
 235 #define DAS1600_ENABLE          0x406
 236 #define   DAS1600_ENABLE_VAL            0x40
 237 #define DAS1600_STATUS_B        0x407
 238 #define   DAS1600_BME           0x40
 239 #define   DAS1600_ME            0x20
 240 #define   DAS1600_CD                    0x10
 241 #define   DAS1600_WS                    0x02
 242 #define   DAS1600_CLK_10MHZ             0x01
 243
 244 static const struct comedi_lrange range_das1x01_bip = { 4, {
 245                                                             BIP_RANGE(10),
 246                                                             BIP_RANGE(1),
 247                                                             BIP_RANGE(0.1),
 248                                                             BIP_RANGE(0.01),
 249                                                             }
 250 };
 251
 252 static const struct comedi_lrange range_das1x01_unip = { 4, {
 253                                                              UNI_RANGE(10),
 254                                                              UNI_RANGE(1),
 255                                                              UNI_RANGE(0.1),
 256                                                              UNI_RANGE(0.01),
 257                                                              }
 258 };
 259
 260 static const struct comedi_lrange range_das1x02_bip = { 4, {
 261                                                             BIP_RANGE(10),
 262                                                             BIP_RANGE(5),
 263                                                             BIP_RANGE(2.5),
 264                                                             BIP_RANGE(1.25),
 265                                                             }
 266 };
 267
 268 static const struct comedi_lrange range_das1x02_unip = { 4, {
 269                                                              UNI_RANGE(10),
 270                                                              UNI_RANGE(5),
 271                                                              UNI_RANGE(2.5),
 272                                                              UNI_RANGE(1.25),
 273                                                              }
 274 };
 275
 276 static const struct comedi_lrange range_das16jr = { 9, {
 277                                                 /*  also used by 16/330 */
 278                                                         BIP_RANGE(10),
 279                                                         BIP_RANGE(5),
 280                                                         BIP_RANGE(2.5),
 281                                                         BIP_RANGE(1.25),
 282                                                         BIP_RANGE(0.625),
 283                                                         UNI_RANGE(10),
 284                                                         UNI_RANGE(5),
 285                                                         UNI_RANGE(2.5),
 286                                                         UNI_RANGE(1.25),
 287                                                         }
 288 };
 289
 290 static const struct comedi_lrange range_das16jr_16 = { 8, {
 291                                                            BIP_RANGE(10),
 292                                                            BIP_RANGE(5),
 293                                                            BIP_RANGE(2.5),
 294                                                            BIP_RANGE(1.25),
 295                                                            UNI_RANGE(10),
 296                                                            UNI_RANGE(5),
 297                                                            UNI_RANGE(2.5),
 298                                                            UNI_RANGE(1.25),
 299                                                            }
 300 };
 301
 302 static const int das16jr_gainlist[] = { 8, 0, 1, 2, 3, 4, 5, 6, 7 };
 303 static const int das16jr_16_gainlist[] = { 0, 1, 2, 3, 4, 5, 6, 7 };
 304 static const int das1600_gainlist[] = { 0, 1, 2, 3 };
 305
 306 enum {
 307         das16_pg_none = 0,
 308         das16_pg_16jr,
 309         das16_pg_16jr_16,
 310         das16_pg_1601,
 311         das16_pg_1602,
 312 };
 313 static const int *const das16_gainlists[] = {
 314         NULL,
 315         das16jr_gainlist,
 316         das16jr_16_gainlist,
 317         das1600_gainlist,
 318         das1600_gainlist,
 319 };
 320
 321 static const struct comedi_lrange *const das16_ai_uni_lranges[] = {
 322         &range_unknown,
 323         &range_das16jr,
 324         &range_das16jr_16,
 325         &range_das1x01_unip,
 326         &range_das1x02_unip,
 327 };
 328
 329 static const struct comedi_lrange *const das16_ai_bip_lranges[] = {
 330         &range_unknown,
 331         &range_das16jr,
 332         &range_das16jr_16,
 333         &range_das1x01_bip,
 334         &range_das1x02_bip,
 335 };
 336
 337 struct munge_info {
 338         uint8_t byte;
 339         unsigned have_byte:1;
 340 };
 341
 342 struct das16_board {
 343         const char *name;
 344         void *ai;
 345         unsigned int ai_nbits;
 346         unsigned int ai_speed;  /*  max conversion speed in nanosec */
 347         unsigned int ai_pg;
 348         void *ao;
 349         unsigned int ao_nbits;
 350         void *di;
 351         void *do_;
 352
 353         unsigned int i8255_offset;
 354         unsigned int i8254_offset;
 355
 356         unsigned int size;
 357         unsigned int id;
 358 };
 359
 360 #define DAS16_TIMEOUT 1000
 361
 362 /* Period for timer interrupt in jiffies.  It's a function
 363  * to deal with possibility of dynamic HZ patches  */
 364 static inline int timer_period(void)
 365 {
 366         return HZ / 20;
 367 }
 368
 369 struct das16_private_struct {
 370         unsigned int ai_unipolar;       /*  unipolar flag */
 371         unsigned int ai_singleended;    /*  single ended flag */
 372         unsigned int clockbase; /*  master clock speed in ns */
 373         volatile unsigned int control_state;    /*  dma, interrupt and trigger control bits */
 374         volatile unsigned long adc_byte_count;  /*  number of bytes remaining */
 375         /*  divisor dividing master clock to get conversion frequency */
 376         unsigned int divisor1;
 377         /*  divisor dividing master clock to get conversion frequency */
 378         unsigned int divisor2;
 379         unsigned int dma_chan;  /*  dma channel */
 380         uint16_t *dma_buffer[2];
 381         dma_addr_t dma_buffer_addr[2];
 382         unsigned int current_buffer;
 383         volatile unsigned int dma_transfer_size;        /*  target number of bytes to transfer per dma shot */
 384         /**
 385          * user-defined analog input and output ranges
 386          * defined from config options
 387          */
 388         struct comedi_lrange *user_ai_range_table;
 389         struct comedi_lrange *user_ao_range_table;
 390
 391         struct timer_list timer;        /*  for timed interrupt */
 392         volatile short timer_running;
 393         volatile short timer_mode;      /*  true if using timer mode */
 394 };
 395 #define devpriv ((struct das16_private_struct *)(dev->private))
 396
 397 static int das16_cmd_test(struct comedi_device *dev, struct comedi_subdevice *s,
 398                           struct comedi_cmd *cmd)
 399 {
 400         const struct das16_board *board = comedi_board(dev);
 401         int err = 0, tmp;
 402         int gain, start_chan, i;
 403         int mask;
 404
 405         /* make sure triggers are valid */
 406         tmp = cmd->start_src;
 407         cmd->start_src &= TRIG_NOW;
 408         if (!cmd->start_src || tmp != cmd->start_src)
 409                 err++;
 410
 411         tmp = cmd->scan_begin_src;
 412         mask = TRIG_FOLLOW;
 413         /*  if board supports burst mode */
 414         if (board->size > 0x400)
 415                 mask |= TRIG_TIMER | TRIG_EXT;
 416         cmd->scan_begin_src &= mask;
 417         if (!cmd->scan_begin_src || tmp != cmd->scan_begin_src)
 418                 err++;
 419
 420         tmp = cmd->convert_src;
 421         mask = TRIG_TIMER | TRIG_EXT;
 422         /*  if board supports burst mode */
 423         if (board->size > 0x400)
 424                 mask |= TRIG_NOW;
 425         cmd->convert_src &= mask;
 426         if (!cmd->convert_src || tmp != cmd->convert_src)
 427                 err++;
 428
 429         tmp = cmd->scan_end_src;
 430         cmd->scan_end_src &= TRIG_COUNT;
 431         if (!cmd->scan_end_src || tmp != cmd->scan_end_src)
 432                 err++;
 433
 434         tmp = cmd->stop_src;
 435         cmd->stop_src &= TRIG_COUNT | TRIG_NONE;
 436         if (!cmd->stop_src || tmp != cmd->stop_src)
 437                 err++;
 438
 439         if (err)
 440                 return 1;
 441
 442         /**
 443          * step 2: make sure trigger sources are unique and
 444          * mutually compatible
 445          */
 446         if (cmd->scan_begin_src != TRIG_TIMER &&
 447             cmd->scan_begin_src != TRIG_EXT &&
 448             cmd->scan_begin_src != TRIG_FOLLOW)
 449                 err++;
 450         if (cmd->convert_src != TRIG_TIMER &&
 451             cmd->convert_src != TRIG_EXT && cmd->convert_src != TRIG_NOW)
 452                 err++;
 453         if (cmd->stop_src != TRIG_NONE && cmd->stop_src != TRIG_COUNT)
 454                 err++;
 455
 456         /*  make sure scan_begin_src and convert_src dont conflict */
 457         if (cmd->scan_begin_src == TRIG_FOLLOW && cmd->convert_src == TRIG_NOW)
 458                 err++;
 459         if (cmd->scan_begin_src != TRIG_FOLLOW && cmd->convert_src != TRIG_NOW)
 460                 err++;
 461
 462         if (err)
 463                 return 2;
 464
 465         /* step 3: make sure arguments are trivially compatible */
 466         if (cmd->start_arg != 0) {
 467                 cmd->start_arg = 0;
 468                 err++;
 469         }
 470
 471         if (cmd->scan_begin_src == TRIG_FOLLOW) {
 472                 /* internal trigger */
 473                 if (cmd->scan_begin_arg != 0) {
 474                         cmd->scan_begin_arg = 0;
 475                         err++;
 476                 }
 477         }
 478
 479         if (cmd->scan_end_arg != cmd->chanlist_len) {
 480                 cmd->scan_end_arg = cmd->chanlist_len;
 481                 err++;
 482         }
 483         /*  check against maximum frequency */
 484         if (cmd->scan_begin_src == TRIG_TIMER) {
 485                 if (cmd->scan_begin_arg <
 486                     board->ai_speed * cmd->chanlist_len) {
 487                         cmd->scan_begin_arg =
 488                             board->ai_speed * cmd->chanlist_len;
 489                         err++;
 490                 }
 491         }
 492         if (cmd->convert_src == TRIG_TIMER) {
 493                 if (cmd->convert_arg < board->ai_speed) {
 494                         cmd->convert_arg = board->ai_speed;
 495                         err++;
 496                 }
 497         }
 498
 499         if (cmd->stop_src == TRIG_NONE) {
 500                 if (cmd->stop_arg != 0) {
 501                         cmd->stop_arg = 0;
 502                         err++;
 503                 }
 504         }
 505         if (err)
 506                 return 3;
 507
 508         /*  step 4: fix up arguments */
 509         if (cmd->scan_begin_src == TRIG_TIMER) {
 510                 unsigned int tmp = cmd->scan_begin_arg;
 511                 /*  set divisors, correct timing arguments */
 512                 i8253_cascade_ns_to_timer_2div(devpriv->clockbase,
 513                                                &(devpriv->divisor1),
 514                                                &(devpriv->divisor2),
 515                                                &(cmd->scan_begin_arg),
 516                                                cmd->flags & TRIG_ROUND_MASK);
 517                 err += (tmp != cmd->scan_begin_arg);
 518         }
 519         if (cmd->convert_src == TRIG_TIMER) {
 520                 unsigned int tmp = cmd->convert_arg;
 521                 /*  set divisors, correct timing arguments */
 522                 i8253_cascade_ns_to_timer_2div(devpriv->clockbase,
 523                                                &(devpriv->divisor1),
 524                                                &(devpriv->divisor2),
 525                                                &(cmd->convert_arg),
 526                                                cmd->flags & TRIG_ROUND_MASK);
 527                 err += (tmp != cmd->convert_arg);
 528         }
 529         if (err)
 530                 return 4;
 531
 532         /*  check channel/gain list against card's limitations */
 533         if (cmd->chanlist) {
 534                 gain = CR_RANGE(cmd->chanlist[0]);
 535                 start_chan = CR_CHAN(cmd->chanlist[0]);
 536                 for (i = 1; i < cmd->chanlist_len; i++) {
 537                         if (CR_CHAN(cmd->chanlist[i]) !=
 538                             (start_chan + i) % s->n_chan) {
 539                                 comedi_error(dev,
 540                                                 "entries in chanlist must be "
 541                                                 "consecutive channels, "
 542                                                 "counting upwards\n");
 543                                 err++;
 544                         }
 545                         if (CR_RANGE(cmd->chanlist[i]) != gain) {
 546                                 comedi_error(dev,
 547                                                 "entries in chanlist must all "
 548                                                 "have the same gain\n");
 549                                 err++;
 550                         }
 551                 }
 552         }
 553         if (err)
 554                 return 5;
 555
 556         return 0;
 557 }
 558
 559 /* utility function that suggests a dma transfer size in bytes */
 560 static unsigned int das16_suggest_transfer_size(struct comedi_device *dev,
 561                                                 struct comedi_cmd cmd)
 562 {
 563         unsigned int size;
 564         unsigned int freq;
 565
 566         /* if we are using timer interrupt, we don't care how long it
 567          * will take to complete transfer since it will be interrupted
 568          * by timer interrupt */
 569         if (devpriv->timer_mode)
 570                 return DAS16_DMA_SIZE;
 571
 572         /* otherwise, we are relying on dma terminal count interrupt,
 573          * so pick a reasonable size */
 574         if (cmd.convert_src == TRIG_TIMER)
 575                 freq = 1000000000 / cmd.convert_arg;
 576         else if (cmd.scan_begin_src == TRIG_TIMER)
 577                 freq = (1000000000 / cmd.scan_begin_arg) * cmd.chanlist_len;
 578         /*  return some default value */
 579         else
 580                 freq = 0xffffffff;
 581
 582         if (cmd.flags & TRIG_WAKE_EOS) {
 583                 size = sample_size * cmd.chanlist_len;
 584         } else {
 585                 /*  make buffer fill in no more than 1/3 second */
 586                 size = (freq / 3) * sample_size;
 587         }
 588
 589         /*  set a minimum and maximum size allowed */
 590         if (size > DAS16_DMA_SIZE)
 591                 size = DAS16_DMA_SIZE - DAS16_DMA_SIZE % sample_size;
 592         else if (size < sample_size)
 593                 size = sample_size;
 594
 595         if (cmd.stop_src == TRIG_COUNT && size > devpriv->adc_byte_count)
 596                 size = devpriv->adc_byte_count;
 597
 598         return size;
 599 }
 600
 601 static unsigned int das16_set_pacer(struct comedi_device *dev, unsigned int ns,
 602                                     int rounding_flags)
 603 {
 604         i8253_cascade_ns_to_timer_2div(devpriv->clockbase, &(devpriv->divisor1),
 605                                        &(devpriv->divisor2), &ns,
 606                                        rounding_flags & TRIG_ROUND_MASK);
 607
 608         /* Write the values of ctr1 and ctr2 into counters 1 and 2 */
 609         i8254_load(dev->iobase + DAS16_CNTR0_DATA, 0, 1, devpriv->divisor1, 2);
 610         i8254_load(dev->iobase + DAS16_CNTR0_DATA, 0, 2, devpriv->divisor2, 2);
 611
 612         return ns;
 613 }
 614
 615 static int das16_cmd_exec(struct comedi_device *dev, struct comedi_subdevice *s)
 616 {
 617         const struct das16_board *board = comedi_board(dev);
 618         struct comedi_async *async = s->async;
 619         struct comedi_cmd *cmd = &async->cmd;
 620         unsigned int byte;
 621         unsigned long flags;
 622         int range;
 623
 624         if (devpriv->dma_chan == 0 || (dev->irq == 0
 625                                        && devpriv->timer_mode == 0)) {
 626                 comedi_error(dev,
 627                                 "irq (or use of 'timer mode') dma required to "
 628                                                         "execute comedi_cmd");
 629                 return -1;
 630         }
 631         if (cmd->flags & TRIG_RT) {
 632                 comedi_error(dev, "isa dma transfers cannot be performed with "
 633                                                         "TRIG_RT, aborting");
 634                 return -1;
 635         }
 636
 637         devpriv->adc_byte_count =
 638             cmd->stop_arg * cmd->chanlist_len * sizeof(uint16_t);
 639
 640         /*  disable conversions for das1600 mode */
 641         if (board->size > 0x400)
 642                 outb(DAS1600_CONV_DISABLE, dev->iobase + DAS1600_CONV);
 643
 644         /*  set scan limits */
 645         byte = CR_CHAN(cmd->chanlist[0]);
 646         byte |= CR_CHAN(cmd->chanlist[cmd->chanlist_len - 1]) << 4;
 647         outb(byte, dev->iobase + DAS16_MUX);
 648
 649         /* set gain (this is also burst rate register but according to
 650          * computer boards manual, burst rate does nothing, even on
 651          * keithley cards) */
 652         if (board->ai_pg != das16_pg_none) {
 653                 range = CR_RANGE(cmd->chanlist[0]);
 654                 outb((das16_gainlists[board->ai_pg])[range],
 655                      dev->iobase + DAS16_GAIN);
 656         }
 657
 658         /* set counter mode and counts */
 659         cmd->convert_arg =
 660             das16_set_pacer(dev, cmd->convert_arg,
 661                             cmd->flags & TRIG_ROUND_MASK);
 662         DEBUG_PRINT("pacer period: %d ns\n", cmd->convert_arg);
 663
 664         /* enable counters */
 665         byte = 0;
 666         /* Enable burst mode if appropriate. */
 667         if (board->size > 0x400) {
 668                 if (cmd->convert_src == TRIG_NOW) {
 669                         outb(DAS1600_BURST_VAL, dev->iobase + DAS1600_BURST);
 670                         /*  set burst length */
 671                         byte |= BURST_LEN_BITS(cmd->chanlist_len - 1);
 672                 } else {
 673                         outb(0, dev->iobase + DAS1600_BURST);
 674                 }
 675         }
 676         outb(byte, dev->iobase + DAS16_PACER);
 677
 678         /*  set up dma transfer */
 679         flags = claim_dma_lock();
 680         disable_dma(devpriv->dma_chan);
 681         /* clear flip-flop to make sure 2-byte registers for
 682          * count and address get set correctly */
 683         clear_dma_ff(devpriv->dma_chan);
 684         devpriv->current_buffer = 0;
 685         set_dma_addr(devpriv->dma_chan,
 686                      devpriv->dma_buffer_addr[devpriv->current_buffer]);
 687         /*  set appropriate size of transfer */
 688         devpriv->dma_transfer_size = das16_suggest_transfer_size(dev, *cmd);
 689         set_dma_count(devpriv->dma_chan, devpriv->dma_transfer_size);
 690         enable_dma(devpriv->dma_chan);
 691         release_dma_lock(flags);
 692
 693         /*  set up interrupt */
 694         if (devpriv->timer_mode) {
 695                 devpriv->timer_running = 1;
 696                 devpriv->timer.expires = jiffies + timer_period();
 697                 add_timer(&devpriv->timer);
 698                 devpriv->control_state &= ~DAS16_INTE;
 699         } else {
 700                 /* clear interrupt bit */
 701                 outb(0x00, dev->iobase + DAS16_STATUS);
 702                 /* enable interrupts */
 703                 devpriv->control_state |= DAS16_INTE;
 704         }
 705         devpriv->control_state |= DMA_ENABLE;
 706         devpriv->control_state &= ~PACING_MASK;
 707         if (cmd->convert_src == TRIG_EXT)
 708                 devpriv->control_state |= EXT_PACER;
 709         else
 710                 devpriv->control_state |= INT_PACER;
 711         outb(devpriv->control_state, dev->iobase + DAS16_CONTROL);
 712
 713         /* Enable conversions if using das1600 mode */
 714         if (board->size > 0x400)
 715                 outb(0, dev->iobase + DAS1600_CONV);
 716
 717
 718         return 0;
 719 }
 720
 721 static int das16_cancel(struct comedi_device *dev, struct comedi_subdevice *s)
 722 {
 723         const struct das16_board *board = comedi_board(dev);
 724         unsigned long flags;
 725
 726         spin_lock_irqsave(&dev->spinlock, flags);
 727         /* disable interrupts, dma and pacer clocked conversions */
 728         devpriv->control_state &= ~DAS16_INTE & ~PACING_MASK & ~DMA_ENABLE;
 729         outb(devpriv->control_state, dev->iobase + DAS16_CONTROL);
 730         if (devpriv->dma_chan)
 731                 disable_dma(devpriv->dma_chan);
 732
 733         /*  disable SW timer */
 734         if (devpriv->timer_mode && devpriv->timer_running) {
 735                 devpriv->timer_running = 0;
 736                 del_timer(&devpriv->timer);
 737         }
 738
 739         /* disable burst mode */
 740         if (board->size > 0x400)
 741                 outb(0, dev->iobase + DAS1600_BURST);
 742
 743
 744         spin_unlock_irqrestore(&dev->spinlock, flags);
 745
 746         return 0;
 747 }
 748
 749 static void das16_reset(struct comedi_device *dev)
 750 {
 751         outb(0, dev->iobase + DAS16_STATUS);
 752         outb(0, dev->iobase + DAS16_CONTROL);
 753         outb(0, dev->iobase + DAS16_PACER);
 754         outb(0, dev->iobase + DAS16_CNTR_CONTROL);
 755 }
 756
 757 static int das16_ai_rinsn(struct comedi_device *dev, struct comedi_subdevice *s,
 758                           struct comedi_insn *insn, unsigned int *data)
 759 {
 760         const struct das16_board *board = comedi_board(dev);
 761         int i, n;
 762         int range;
 763         int chan;
 764         int msb, lsb;
 765
 766         /*  disable interrupts and pacing */
 767         devpriv->control_state &= ~DAS16_INTE & ~DMA_ENABLE & ~PACING_MASK;
 768         outb(devpriv->control_state, dev->iobase + DAS16_CONTROL);
 769
 770         /* set multiplexer */
 771         chan = CR_CHAN(insn->chanspec);
 772         chan |= CR_CHAN(insn->chanspec) << 4;
 773         outb(chan, dev->iobase + DAS16_MUX);
 774
 775         /* set gain */
 776         if (board->ai_pg != das16_pg_none) {
 777                 range = CR_RANGE(insn->chanspec);
 778                 outb((das16_gainlists[board->ai_pg])[range],
 779                      dev->iobase + DAS16_GAIN);
 780         }
 781
 782         for (n = 0; n < insn->n; n++) {
 783                 /* trigger conversion */
 784                 outb_p(0, dev->iobase + DAS16_TRIG);
 785
 786                 for (i = 0; i < DAS16_TIMEOUT; i++) {
 787                         if (!(inb(dev->iobase + DAS16_STATUS) & BUSY))
 788                                 break;
 789                 }
 790                 if (i == DAS16_TIMEOUT) {
 791                         printk("das16: timeout\n");
 792                         return -ETIME;
 793                 }
 794                 msb = inb(dev->iobase + DAS16_AI_MSB);
 795                 lsb = inb(dev->iobase + DAS16_AI_LSB);
 796                 if (board->ai_nbits == 12)
 797                         data[n] = ((lsb >> 4) & 0xf) | (msb << 4);
 798                 else
 799                         data[n] = lsb | (msb << 8);
 800
 801         }
 802
 803         return n;
 804 }
 805
 806 static int das16_di_rbits(struct comedi_device *dev, struct comedi_subdevice *s,
 807                           struct comedi_insn *insn, unsigned int *data)
 808 {
 809         unsigned int bits;
 810
 811         bits = inb(dev->iobase + DAS16_DIO) & 0xf;
 812         data[1] = bits;
 813         data[0] = 0;
 814
 815         return insn->n;
 816 }
 817
 818 static int das16_do_wbits(struct comedi_device *dev, struct comedi_subdevice *s,
 819                           struct comedi_insn *insn, unsigned int *data)
 820 {
 821         unsigned int wbits;
 822
 823         /*  only set bits that have been masked */
 824         data[0] &= 0xf;
 825         wbits = s->state;
 826         /*  zero bits that have been masked */
 827         wbits &= ~data[0];
 828         /*  set masked bits */
 829         wbits |= data[0] & data[1];
 830         s->state = wbits;
 831         data[1] = wbits;
 832
 833         outb(s->state, dev->iobase + DAS16_DIO);
 834
 835         return insn->n;
 836 }
 837
 838 static int das16_ao_winsn(struct comedi_device *dev, struct comedi_subdevice *s,
 839                           struct comedi_insn *insn, unsigned int *data)
 840 {
 841         const struct das16_board *board = comedi_board(dev);
 842         int i;
 843         int lsb, msb;
 844         int chan;
 845
 846         chan = CR_CHAN(insn->chanspec);
 847
 848         for (i = 0; i < insn->n; i++) {
 849                 if (board->ao_nbits == 12) {
 850                         lsb = (data[i] << 4) & 0xff;
 851                         msb = (data[i] >> 4) & 0xff;
 852                 } else {
 853                         lsb = data[i] & 0xff;
 854                         msb = (data[i] >> 8) & 0xff;
 855                 }
 856                 outb(lsb, dev->iobase + DAS16_AO_LSB(chan));
 857                 outb(msb, dev->iobase + DAS16_AO_MSB(chan));
 858         }
 859
 860         return i;
 861 }
 862
 863 /* the pc104-das16jr (at least) has problems if the dma
 864         transfer is interrupted in the middle of transferring
 865         a 16 bit sample, so this function takes care to get
 866         an even transfer count after disabling dma
 867         channel.
 868 */
 869 static int disable_dma_on_even(struct comedi_device *dev)
 870 {
 871         int residue;
 872         int i;
 873         static const int disable_limit = 100;
 874         static const int enable_timeout = 100;
 875         disable_dma(devpriv->dma_chan);
 876         residue = get_dma_residue(devpriv->dma_chan);
 877         for (i = 0; i < disable_limit && (residue % 2); ++i) {
 878                 int j;
 879                 enable_dma(devpriv->dma_chan);
 880                 for (j = 0; j < enable_timeout; ++j) {
 881                         int new_residue;
 882                         udelay(2);
 883                         new_residue = get_dma_residue(devpriv->dma_chan);
 884                         if (new_residue != residue)
 885                                 break;
 886                 }
 887                 disable_dma(devpriv->dma_chan);
 888                 residue = get_dma_residue(devpriv->dma_chan);
 889         }
 890         if (i == disable_limit) {
 891                 comedi_error(dev, "failed to get an even dma transfer, "
 892                                                         "could be trouble.");
 893         }
 894         return residue;
 895 }
 896
 897 static void das16_interrupt(struct comedi_device *dev)
 898 {
 899         const struct das16_board *board = comedi_board(dev);
 900         unsigned long dma_flags, spin_flags;
 901         struct comedi_subdevice *s = dev->read_subdev;
 902         struct comedi_async *async;
 903         struct comedi_cmd *cmd;
 904         int num_bytes, residue;
 905         int buffer_index;
 906
 907         if (dev->attached == 0) {
 908                 comedi_error(dev, "premature interrupt");
 909                 return;
 910         }
 911         /*  initialize async here to make sure it is not NULL */
 912         async = s->async;
 913         cmd = &async->cmd;
 914
 915         if (devpriv->dma_chan == 0) {
 916                 comedi_error(dev, "interrupt with no dma channel?");
 917                 return;
 918         }
 919
 920         spin_lock_irqsave(&dev->spinlock, spin_flags);
 921         if ((devpriv->control_state & DMA_ENABLE) == 0) {
 922                 spin_unlock_irqrestore(&dev->spinlock, spin_flags);
 923                 DEBUG_PRINT("interrupt while dma disabled?\n");
 924                 return;
 925         }
 926
 927         dma_flags = claim_dma_lock();
 928         clear_dma_ff(devpriv->dma_chan);
 929         residue = disable_dma_on_even(dev);
 930
 931         /*  figure out how many points to read */
 932         if (residue > devpriv->dma_transfer_size) {
 933                 comedi_error(dev, "residue > transfer size!\n");
 934                 async->events |= COMEDI_CB_ERROR | COMEDI_CB_EOA;
 935                 num_bytes = 0;
 936         } else
 937                 num_bytes = devpriv->dma_transfer_size - residue;
 938
 939         if (cmd->stop_src == TRIG_COUNT &&
 940                                         num_bytes >= devpriv->adc_byte_count) {
 941                 num_bytes = devpriv->adc_byte_count;
 942                 async->events |= COMEDI_CB_EOA;
 943         }
 944
 945         buffer_index = devpriv->current_buffer;
 946         devpriv->current_buffer = (devpriv->current_buffer + 1) % 2;
 947         devpriv->adc_byte_count -= num_bytes;
 948
 949         /*  figure out how many bytes for next transfer */
 950         if (cmd->stop_src == TRIG_COUNT && devpriv->timer_mode == 0 &&
 951             devpriv->dma_transfer_size > devpriv->adc_byte_count)
 952                 devpriv->dma_transfer_size = devpriv->adc_byte_count;
 953
 954         /*  re-enable  dma */
 955         if ((async->events & COMEDI_CB_EOA) == 0) {
 956                 set_dma_addr(devpriv->dma_chan,
 957                              devpriv->dma_buffer_addr[devpriv->current_buffer]);
 958                 set_dma_count(devpriv->dma_chan, devpriv->dma_transfer_size);
 959                 enable_dma(devpriv->dma_chan);
 960                 /* reenable conversions for das1600 mode, (stupid hardware) */
 961                 if (board->size > 0x400 && devpriv->timer_mode == 0)
 962                         outb(0x00, dev->iobase + DAS1600_CONV);
 963
 964         }
 965         release_dma_lock(dma_flags);
 966
 967         spin_unlock_irqrestore(&dev->spinlock, spin_flags);
 968
 969         cfc_write_array_to_buffer(s,
 970                                   devpriv->dma_buffer[buffer_index], num_bytes);
 971
 972         cfc_handle_events(dev, s);
 973 }
 974
 975 static irqreturn_t das16_dma_interrupt(int irq, void *d)
 976 {
 977         int status;
 978         struct comedi_device *dev = d;
 979
 980         status = inb(dev->iobase + DAS16_STATUS);
 981
 982         if ((status & DAS16_INT) == 0) {
 983                 DEBUG_PRINT("spurious interrupt\n");
 984                 return IRQ_NONE;
 985         }
 986
 987         /* clear interrupt */
 988         outb(0x00, dev->iobase + DAS16_STATUS);
 989         das16_interrupt(dev);
 990         return IRQ_HANDLED;
 991 }
 992
 993 static void das16_timer_interrupt(unsigned long arg)
 994 {
 995         struct comedi_device *dev = (struct comedi_device *)arg;
 996
 997         das16_interrupt(dev);
 998
 999         if (devpriv->timer_running)
1000                 mod_timer(&devpriv->timer, jiffies + timer_period());
1001 }
1002
1003 static void reg_dump(struct comedi_device *dev)
1004 {
1005         DEBUG_PRINT("********DAS1600 REGISTER DUMP********\n");
1006         DEBUG_PRINT("DAS16_MUX: %x\n", inb(dev->iobase + DAS16_MUX));
1007         DEBUG_PRINT("DAS16_DIO: %x\n", inb(dev->iobase + DAS16_DIO));
1008         DEBUG_PRINT("DAS16_STATUS: %x\n", inb(dev->iobase + DAS16_STATUS));
1009         DEBUG_PRINT("DAS16_CONTROL: %x\n", inb(dev->iobase + DAS16_CONTROL));
1010         DEBUG_PRINT("DAS16_PACER: %x\n", inb(dev->iobase + DAS16_PACER));
1011         DEBUG_PRINT("DAS16_GAIN: %x\n", inb(dev->iobase + DAS16_GAIN));
1012         DEBUG_PRINT("DAS16_CNTR_CONTROL: %x\n",
1013                     inb(dev->iobase + DAS16_CNTR_CONTROL));
1014         DEBUG_PRINT("DAS1600_CONV: %x\n", inb(dev->iobase + DAS1600_CONV));
1015         DEBUG_PRINT("DAS1600_BURST: %x\n", inb(dev->iobase + DAS1600_BURST));
1016         DEBUG_PRINT("DAS1600_ENABLE: %x\n", inb(dev->iobase + DAS1600_ENABLE));
1017         DEBUG_PRINT("DAS1600_STATUS_B: %x\n",
1018                     inb(dev->iobase + DAS1600_STATUS_B));
1019 }
1020
1021 static int das16_probe(struct comedi_device *dev, struct comedi_devconfig *it)
1022 {
1023         const struct das16_board *board = comedi_board(dev);
1024         int status;
1025         int diobits;
1026
1027         /* status is available on all boards */
1028
1029         status = inb(dev->iobase + DAS16_STATUS);
1030
1031         if ((status & UNIPOLAR))
1032                 devpriv->ai_unipolar = 1;
1033         else
1034                 devpriv->ai_unipolar = 0;
1035
1036
1037         if ((status & DAS16_MUXBIT))
1038                 devpriv->ai_singleended = 1;
1039         else
1040                 devpriv->ai_singleended = 0;
1041
1042
1043         /* diobits indicates boards */
1044
1045         diobits = inb(dev->iobase + DAS16_DIO) & 0xf0;
1046
1047         printk(KERN_INFO " id bits are 0x%02x\n", diobits);
1048         if (board->id != diobits) {
1049                 printk(KERN_INFO " requested board's id bits are 0x%x (ignore)\n",
1050                        board->id);
1051         }
1052
1053         return 0;
1054 }
1055
1056 static int das1600_mode_detect(struct comedi_device *dev)
1057 {
1058         int status = 0;
1059
1060         status = inb(dev->iobase + DAS1600_STATUS_B);
1061
1062         if (status & DAS1600_CLK_10MHZ) {
1063                 devpriv->clockbase = 100;
1064                 printk(KERN_INFO " 10MHz pacer clock\n");
1065         } else {
1066                 devpriv->clockbase = 1000;
1067                 printk(KERN_INFO " 1MHz pacer clock\n");
1068         }
1069
1070         reg_dump(dev);
1071
1072         return 0;
1073 }
1074
1075 static void das16_ai_munge(struct comedi_device *dev,
1076                            struct comedi_subdevice *s, void *array,
1077                            unsigned int num_bytes,
1078                            unsigned int start_chan_index)
1079 {
1080         const struct das16_board *board = comedi_board(dev);
1081         unsigned int i, num_samples = num_bytes / sizeof(short);
1082         short *data = array;
1083
1084         for (i = 0; i < num_samples; i++) {
1085                 data[i] = le16_to_cpu(data[i]);
1086                 if (board->ai_nbits == 12)
1087                         data[i] = (data[i] >> 4) & 0xfff;
1088
1089         }
1090 }
1091
1092 /*
1093  *
1094  * Options list:
1095  *   0  I/O base
1096  *   1  IRQ
1097  *   2  DMA
1098  *   3  Clock speed (in MHz)
1099  */
1100 static int das16_attach(struct comedi_device *dev, struct comedi_devconfig *it)
1101 {
1102         const struct das16_board *board = comedi_board(dev);
1103         struct comedi_subdevice *s;
1104         int ret;
1105         unsigned int irq;
1106         unsigned long iobase;
1107         unsigned int dma_chan;
1108         int timer_mode;
1109         unsigned long flags;
1110         struct comedi_krange *user_ai_range, *user_ao_range;
1111
1112         iobase = it->options[0];
1113 #if 0
1114         irq = it->options[1];
1115         timer_mode = it->options[8];
1116 #endif
1117         /* always use time_mode since using irq can drop samples while
1118          * waiting for dma done interrupt (due to hardware limitations) */
1119         irq = 0;
1120         timer_mode = 1;
1121         if (timer_mode)
1122                 irq = 0;
1123
1124         printk(KERN_INFO "comedi%d: das16:", dev->minor);
1125
1126         /*  check that clock setting is valid */
1127         if (it->options[3]) {
1128                 if (it->options[3] != 0 &&
1129                     it->options[3] != 1 && it->options[3] != 10) {
1130                         printk
1131                             ("\n Invalid option.  Master clock must be set "
1132                                                         "to 1 or 10 (MHz)\n");
1133                         return -EINVAL;
1134                 }
1135         }
1136
1137         ret = alloc_private(dev, sizeof(struct das16_private_struct));
1138         if (ret < 0)
1139                 return ret;
1140
1141         if (board->size < 0x400) {
1142                 printk(" 0x%04lx-0x%04lx\n", iobase, iobase + board->size);
1143                 if (!request_region(iobase, board->size, "das16")) {
1144                         printk(KERN_ERR " I/O port conflict\n");
1145                         return -EIO;
1146                 }
1147         } else {
1148                 printk(KERN_INFO " 0x%04lx-0x%04lx 0x%04lx-0x%04lx\n",
1149                        iobase, iobase + 0x0f,
1150                        iobase + 0x400,
1151                        iobase + 0x400 + (board->size & 0x3ff));
1152                 if (!request_region(iobase, 0x10, "das16")) {
1153                         printk(KERN_ERR " I/O port conflict:  0x%04lx-0x%04lx\n",
1154                                iobase, iobase + 0x0f);
1155                         return -EIO;
1156                 }
1157                 if (!request_region(iobase + 0x400, board->size & 0x3ff,
1158                                     "das16")) {
1159                         release_region(iobase, 0x10);
1160                         printk(KERN_ERR " I/O port conflict:  0x%04lx-0x%04lx\n",
1161                                iobase + 0x400,
1162                                iobase + 0x400 + (board->size & 0x3ff));
1163                         return -EIO;
1164                 }
1165         }
1166
1167         dev->iobase = iobase;
1168
1169         /*  probe id bits to make sure they are consistent */
1170         if (das16_probe(dev, it)) {
1171                 printk(KERN_ERR " id bits do not match selected board, aborting\n");
1172                 return -EINVAL;
1173         }
1174         dev->board_name = board->name;
1175
1176         /*  get master clock speed */
1177         if (board->size < 0x400) {
1178                 if (it->options[3])
1179                         devpriv->clockbase = 1000 / it->options[3];
1180                 else
1181                         devpriv->clockbase = 1000;      /*  1 MHz default */
1182         } else {
1183                 das1600_mode_detect(dev);
1184         }
1185
1186         /* now for the irq */
1187         if (irq > 1 && irq < 8) {
1188                 ret = request_irq(irq, das16_dma_interrupt, 0, "das16", dev);
1189
1190                 if (ret < 0)
1191                         return ret;
1192                 dev->irq = irq;
1193                 printk(KERN_INFO " ( irq = %u )", irq);
1194         } else if (irq == 0) {
1195                 printk(" ( no irq )");
1196         } else {
1197                 printk(" invalid irq\n");
1198                 return -EINVAL;
1199         }
1200
1201         /*  initialize dma */
1202         dma_chan = it->options[2];
1203         if (dma_chan == 1 || dma_chan == 3) {
1204                 /*  allocate dma buffers */
1205                 int i;
1206                 for (i = 0; i < 2; i++) {
1207                         devpriv->dma_buffer[i] = pci_alloc_consistent(
1208                                                 NULL, DAS16_DMA_SIZE,
1209                                                 &devpriv->dma_buffer_addr[i]);
1210
1211                         if (devpriv->dma_buffer[i] == NULL)
1212                                 return -ENOMEM;
1213                 }
1214                 if (request_dma(dma_chan, "das16")) {
1215                         printk(KERN_ERR " failed to allocate dma channel %i\n",
1216                                dma_chan);
1217                         return -EINVAL;
1218                 }
1219                 devpriv->dma_chan = dma_chan;
1220                 flags = claim_dma_lock();
1221                 disable_dma(devpriv->dma_chan);
1222                 set_dma_mode(devpriv->dma_chan, DMA_MODE_READ);
1223                 release_dma_lock(flags);
1224                 printk(KERN_INFO " ( dma = %u)\n", dma_chan);
1225         } else if (dma_chan == 0) {
1226                 printk(KERN_INFO " ( no dma )\n");
1227         } else {
1228                 printk(KERN_ERR " invalid dma channel\n");
1229                 return -EINVAL;
1230         }
1231
1232         /*  get any user-defined input range */
1233         if (board->ai_pg == das16_pg_none &&
1234             (it->options[4] || it->options[5])) {
1235                 /*  allocate single-range range table */
1236                 devpriv->user_ai_range_table =
1237                     kmalloc(sizeof(struct comedi_lrange) +
1238                             sizeof(struct comedi_krange), GFP_KERNEL);
1239                 /*  initialize ai range */
1240                 devpriv->user_ai_range_table->length = 1;
1241                 user_ai_range = devpriv->user_ai_range_table->range;
1242                 user_ai_range->min = it->options[4];
1243                 user_ai_range->max = it->options[5];
1244                 user_ai_range->flags = UNIT_volt;
1245         }
1246         /*  get any user-defined output range */
1247         if (it->options[6] || it->options[7]) {
1248                 /*  allocate single-range range table */
1249                 devpriv->user_ao_range_table =
1250                     kmalloc(sizeof(struct comedi_lrange) +
1251                             sizeof(struct comedi_krange), GFP_KERNEL);
1252                 /*  initialize ao range */
1253                 devpriv->user_ao_range_table->length = 1;
1254                 user_ao_range = devpriv->user_ao_range_table->range;
1255                 user_ao_range->min = it->options[6];
1256                 user_ao_range->max = it->options[7];
1257                 user_ao_range->flags = UNIT_volt;
1258         }
1259
1260         if (timer_mode) {
1261                 init_timer(&(devpriv->timer));
1262                 devpriv->timer.function = das16_timer_interrupt;
1263                 devpriv->timer.data = (unsigned long)dev;
1264         }
1265         devpriv->timer_mode = timer_mode ? 1 : 0;
1266
1267         ret = comedi_alloc_subdevices(dev, 5);
1268         if (ret)
1269                 return ret;
1270
1271         s = dev->subdevices + 0;
1272         dev->read_subdev = s;
1273         /* ai */
1274         if (board->ai) {
1275                 s->type = COMEDI_SUBD_AI;
1276                 s->subdev_flags = SDF_READABLE | SDF_CMD_READ;
1277                 if (devpriv->ai_singleended) {
1278                         s->n_chan = 16;
1279                         s->len_chanlist = 16;
1280                         s->subdev_flags |= SDF_GROUND;
1281                 } else {
1282                         s->n_chan = 8;
1283                         s->len_chanlist = 8;
1284                         s->subdev_flags |= SDF_DIFF;
1285                 }
1286                 s->maxdata = (1 << board->ai_nbits) - 1;
1287                 if (devpriv->user_ai_range_table) { /*  user defined ai range */
1288                         s->range_table = devpriv->user_ai_range_table;
1289                 } else if (devpriv->ai_unipolar) {
1290                         s->range_table = das16_ai_uni_lranges[board->ai_pg];
1291                 } else {
1292                         s->range_table = das16_ai_bip_lranges[board->ai_pg];
1293                 }
1294                 s->insn_read = board->ai;
1295                 s->do_cmdtest = das16_cmd_test;
1296                 s->do_cmd = das16_cmd_exec;
1297                 s->cancel = das16_cancel;
1298                 s->munge = das16_ai_munge;
1299         } else {
1300                 s->type = COMEDI_SUBD_UNUSED;
1301         }
1302
1303         s = dev->subdevices + 1;
1304         /* ao */
1305         if (board->ao) {
1306                 s->type = COMEDI_SUBD_AO;
1307                 s->subdev_flags = SDF_WRITABLE;
1308                 s->n_chan = 2;
1309                 s->maxdata = (1 << board->ao_nbits) - 1;
1310                 /*  user defined ao range */
1311                 if (devpriv->user_ao_range_table)
1312                         s->range_table = devpriv->user_ao_range_table;
1313                 else
1314                         s->range_table = &range_unknown;
1315
1316                 s->insn_write = board->ao;
1317         } else {
1318                 s->type = COMEDI_SUBD_UNUSED;
1319         }
1320
1321         s = dev->subdevices + 2;
1322         /* di */
1323         if (board->di) {
1324                 s->type = COMEDI_SUBD_DI;
1325                 s->subdev_flags = SDF_READABLE;
1326                 s->n_chan = 4;
1327                 s->maxdata = 1;
1328                 s->range_table = &range_digital;
1329                 s->insn_bits = board->di;
1330         } else {
1331                 s->type = COMEDI_SUBD_UNUSED;
1332         }
1333
1334         s = dev->subdevices + 3;
1335         /* do */
1336         if (board->do_) {
1337                 s->type = COMEDI_SUBD_DO;
1338                 s->subdev_flags = SDF_WRITABLE | SDF_READABLE;
1339                 s->n_chan = 4;
1340                 s->maxdata = 1;
1341                 s->range_table = &range_digital;
1342                 s->insn_bits = board->do_;
1343                 /*  initialize digital output lines */
1344                 outb(s->state, dev->iobase + DAS16_DIO);
1345         } else {
1346                 s->type = COMEDI_SUBD_UNUSED;
1347         }
1348
1349         s = dev->subdevices + 4;
1350         /* 8255 */
1351         if (board->i8255_offset != 0) {
1352                 subdev_8255_init(dev, s, NULL, (dev->iobase +
1353                                                 board->i8255_offset));
1354         } else {
1355                 s->type = COMEDI_SUBD_UNUSED;
1356         }
1357
1358         das16_reset(dev);
1359         /* set the interrupt level */
1360         devpriv->control_state = DAS16_IRQ(dev->irq);
1361         outb(devpriv->control_state, dev->iobase + DAS16_CONTROL);
1362
1363         /*  turn on das1600 mode if available */
1364         if (board->size > 0x400) {
1365                 outb(DAS1600_ENABLE_VAL, dev->iobase + DAS1600_ENABLE);
1366                 outb(0, dev->iobase + DAS1600_CONV);
1367                 outb(0, dev->iobase + DAS1600_BURST);
1368         }
1369
1370         return 0;
1371 }
1372
1373 static void das16_detach(struct comedi_device *dev)
1374 {
1375         const struct das16_board *board = comedi_board(dev);
1376
1377         das16_reset(dev);
1378         if (dev->subdevices)
1379                 subdev_8255_cleanup(dev, dev->subdevices + 4);
1380         if (devpriv) {
1381                 int i;
1382                 for (i = 0; i < 2; i++) {
1383                         if (devpriv->dma_buffer[i])
1384                                 pci_free_consistent(NULL, DAS16_DMA_SIZE,
1385                                                     devpriv->dma_buffer[i],
1386                                                     devpriv->
1387                                                     dma_buffer_addr[i]);
1388                 }
1389                 if (devpriv->dma_chan)
1390                         free_dma(devpriv->dma_chan);
1391                 kfree(devpriv->user_ai_range_table);
1392                 kfree(devpriv->user_ao_range_table);
1393         }
1394         if (dev->irq)
1395                 free_irq(dev->irq, dev);
1396         if (dev->iobase) {
1397                 if (board->size < 0x400) {
1398                         release_region(dev->iobase, board->size);
1399                 } else {
1400                         release_region(dev->iobase, 0x10);
1401                         release_region(dev->iobase + 0x400,
1402                                        board->size & 0x3ff);
1403                 }
1404         }
1405 }
1406
1407 static const struct das16_board das16_boards[] = {
1408         {
1409                 .name           = "das-16",
1410                 .ai             = das16_ai_rinsn,
1411                 .ai_nbits       = 12,
1412                 .ai_speed       = 15000,
1413                 .ai_pg          = das16_pg_none,
1414                 .ao             = das16_ao_winsn,
1415                 .ao_nbits       = 12,
1416                 .di             = das16_di_rbits,
1417                 .do_            = das16_do_wbits,
1418                 .i8255_offset   = 0x10,
1419                 .i8254_offset   = 0x0c,
1420                 .size           = 0x14,
1421                 .id             = 0x00,
1422         }, {
1423                 .name           = "das-16g",
1424                 .ai             = das16_ai_rinsn,
1425                 .ai_nbits       = 12,
1426                 .ai_speed       = 15000,
1427                 .ai_pg          = das16_pg_none,
1428                 .ao             = das16_ao_winsn,
1429                 .ao_nbits       = 12,
1430                 .di             = das16_di_rbits,
1431                 .do_            = das16_do_wbits,
1432                 .i8255_offset   = 0x10,
1433                 .i8254_offset   = 0x0c,
1434                 .size           = 0x14,
1435                 .id             = 0x00,
1436         }, {
1437                 .name           = "das-16f",
1438                 .ai             = das16_ai_rinsn,
1439                 .ai_nbits       = 12,
1440                 .ai_speed       = 8500,
1441                 .ai_pg          = das16_pg_none,
1442                 .ao             = das16_ao_winsn,
1443                 .ao_nbits       = 12,
1444                 .di             = das16_di_rbits,
1445                 .do_            = das16_do_wbits,
1446                 .i8255_offset   = 0x10,
1447                 .i8254_offset   = 0x0c,
1448                 .size           = 0x14,
1449                 .id             = 0x00,
1450         }, {
1451                 .name           = "cio-das16",
1452                 .ai             = das16_ai_rinsn,
1453                 .ai_nbits       = 12,
1454                 .ai_speed       = 20000,
1455                 .ai_pg          = das16_pg_none,
1456                 .ao             = das16_ao_winsn,
1457                 .ao_nbits       = 12,
1458                 .di             = das16_di_rbits,
1459                 .do_            = das16_do_wbits,
1460                 .i8255_offset   = 0x10,
1461                 .i8254_offset   = 0x0c,
1462                 .size           = 0x14,
1463                 .id             = 0x80,
1464         }, {
1465                 .name           = "cio-das16/f",
1466                 .ai             = das16_ai_rinsn,
1467                 .ai_nbits       = 12,
1468                 .ai_speed       = 10000,
1469                 .ai_pg          = das16_pg_none,
1470                 .ao             = das16_ao_winsn,
1471                 .ao_nbits       = 12,
1472                 .di             = das16_di_rbits,
1473                 .do_            = das16_do_wbits,
1474                 .i8255_offset   = 0x10,
1475                 .i8254_offset   = 0x0c,
1476                 .size           = 0x14,
1477                 .id             = 0x80,
1478         }, {
1479                 .name           = "cio-das16/jr",
1480                 .ai             = das16_ai_rinsn,
1481                 .ai_nbits       = 12,
1482                 .ai_speed       = 7692,
1483                 .ai_pg          = das16_pg_16jr,
1484                 .ao             = NULL,
1485                 .di             = das16_di_rbits,
1486                 .do_            = das16_do_wbits,
1487                 .i8255_offset   = 0,
1488                 .i8254_offset   = 0x0c,
1489                 .size           = 0x10,
1490                 .id             = 0x00,
1491         }, {
1492                 .name           = "pc104-das16jr",
1493                 .ai             = das16_ai_rinsn,
1494                 .ai_nbits       = 12,
1495                 .ai_speed       = 3300,
1496                 .ai_pg          = das16_pg_16jr,
1497                 .ao             = NULL,
1498                 .di             = das16_di_rbits,
1499                 .do_            = das16_do_wbits,
1500                 .i8255_offset   = 0,
1501                 .i8254_offset   = 0x0c,
1502                 .size           = 0x10,
1503                 .id             = 0x00,
1504         }, {
1505                 .name           = "cio-das16jr/16",
1506                 .ai             = das16_ai_rinsn,
1507                 .ai_nbits       = 16,
1508                 .ai_speed       = 10000,
1509                 .ai_pg          = das16_pg_16jr_16,
1510                 .ao             = NULL,
1511                 .di             = das16_di_rbits,
1512                 .do_            = das16_do_wbits,
1513                 .i8255_offset   = 0,
1514                 .i8254_offset   = 0x0c,
1515                 .size           = 0x10,
1516                 .id             = 0x00,
1517         }, {
1518                 .name           = "pc104-das16jr/16",
1519                 .ai             = das16_ai_rinsn,
1520                 .ai_nbits       = 16,
1521                 .ai_speed       = 10000,
1522                 .ai_pg          = das16_pg_16jr_16,
1523                 .ao             = NULL,
1524                 .di             = das16_di_rbits,
1525                 .do_            = das16_do_wbits,
1526                 .i8255_offset   = 0,
1527                 .i8254_offset   = 0x0c,
1528                 .size           = 0x10,
1529                 .id             = 0x00,
1530         }, {
1531                 .name           = "das-1201",
1532                 .ai             = das16_ai_rinsn,
1533                 .ai_nbits       = 12,
1534                 .ai_speed       = 20000,
1535                 .ai_pg          = das16_pg_none,
1536                 .ao             = NULL,
1537                 .di             = das16_di_rbits,
1538                 .do_            = das16_do_wbits,
1539                 .i8255_offset   = 0x400,
1540                 .i8254_offset   = 0x0c,
1541                 .size           = 0x408,
1542                 .id             = 0x20,
1543         }, {
1544                 .name           = "das-1202",
1545                 .ai             = das16_ai_rinsn,
1546                 .ai_nbits       = 12,
1547                 .ai_speed       = 10000,
1548                 .ai_pg          = das16_pg_none,
1549                 .ao             = NULL,
1550                 .di             = das16_di_rbits,
1551                 .do_            = das16_do_wbits,
1552                 .i8255_offset   = 0x400,
1553                 .i8254_offset   = 0x0c,
1554                 .size           = 0x408,
1555                 .id             = 0x20,
1556         }, {
1557                 .name           = "das-1401",
1558                 .ai             = das16_ai_rinsn,
1559                 .ai_nbits       = 12,
1560                 .ai_speed       = 10000,
1561                 .ai_pg          = das16_pg_1601,
1562                 .ao             = NULL,
1563                 .di             = das16_di_rbits,
1564                 .do_            = das16_do_wbits,
1565                 .i8255_offset   = 0x0,
1566                 .i8254_offset   = 0x0c,
1567                 .size           = 0x408,
1568                 .id             = 0xc0,
1569         }, {
1570                 .name           = "das-1402",
1571                 .ai             = das16_ai_rinsn,
1572                 .ai_nbits       = 12,
1573                 .ai_speed       = 10000,
1574                 .ai_pg          = das16_pg_1602,
1575                 .ao             = NULL,
1576                 .di             = das16_di_rbits,
1577                 .do_            = das16_do_wbits,
1578                 .i8255_offset   = 0x0,
1579                 .i8254_offset   = 0x0c,
1580                 .size           = 0x408,
1581                 .id             = 0xc0,
1582         }, {
1583                 .name           = "das-1601",
1584                 .ai             = das16_ai_rinsn,
1585                 .ai_nbits       = 12,
1586                 .ai_speed       = 10000,
1587                 .ai_pg          = das16_pg_1601,
1588                 .ao             = das16_ao_winsn,
1589                 .ao_nbits       = 12,
1590                 .di             = das16_di_rbits,
1591                 .do_            = das16_do_wbits,
1592                 .i8255_offset   = 0x400,
1593                 .i8254_offset   = 0x0c,
1594                 .size           = 0x408,
1595                 .id             = 0xc0,
1596         }, {
1597                 .name           = "das-1602",
1598                 .ai             = das16_ai_rinsn,
1599                 .ai_nbits       = 12,
1600                 .ai_speed       = 10000,
1601                 .ai_pg          = das16_pg_1602,
1602                 .ao             = das16_ao_winsn,
1603                 .ao_nbits       = 12,
1604                 .di             = das16_di_rbits,
1605                 .do_            = das16_do_wbits,
1606                 .i8255_offset   = 0x400,
1607                 .i8254_offset   = 0x0c,
1608                 .size           = 0x408,
1609                 .id             = 0xc0,
1610         }, {
1611                 .name           = "cio-das1401/12",
1612                 .ai             = das16_ai_rinsn,
1613                 .ai_nbits       = 12,
1614                 .ai_speed       = 6250,
1615                 .ai_pg          = das16_pg_1601,
1616                 .ao             = NULL,
1617                 .di             = das16_di_rbits,
1618                 .do_            = das16_do_wbits,
1619                 .i8255_offset   = 0,
1620                 .i8254_offset   = 0x0c,
1621                 .size           = 0x408,
1622                 .id             = 0xc0,
1623         }, {
1624                 .name           = "cio-das1402/12",
1625                 .ai             = das16_ai_rinsn,
1626                 .ai_nbits       = 12,
1627                 .ai_speed       = 6250,
1628                 .ai_pg          = das16_pg_1602,
1629                 .ao             = NULL,
1630                 .di             = das16_di_rbits,
1631                 .do_            = das16_do_wbits,
1632                 .i8255_offset   = 0,
1633                 .i8254_offset   = 0x0c,
1634                 .size           = 0x408,
1635                 .id             = 0xc0,
1636         }, {
1637                 .name           = "cio-das1402/16",
1638                 .ai             = das16_ai_rinsn,
1639                 .ai_nbits       = 16,
1640                 .ai_speed       = 10000,
1641                 .ai_pg          = das16_pg_1602,
1642                 .ao             = NULL,
1643                 .di             = das16_di_rbits,
1644                 .do_            = das16_do_wbits,
1645                 .i8255_offset   = 0,
1646                 .i8254_offset   = 0x0c,
1647                 .size           = 0x408,
1648                 .id             = 0xc0,
1649         }, {
1650                 .name           = "cio-das1601/12",
1651                 .ai             = das16_ai_rinsn,
1652                 .ai_nbits       = 12,
1653                 .ai_speed       = 6250,
1654                 .ai_pg          = das16_pg_1601,
1655                 .ao             = das16_ao_winsn,
1656                 .ao_nbits       = 12,
1657                 .di             = das16_di_rbits,
1658                 .do_            = das16_do_wbits,
1659                 .i8255_offset   = 0x400,
1660                 .i8254_offset   = 0x0c,
1661                 .size           = 0x408,
1662                 .id             = 0xc0,
1663         }, {
1664                 .name           = "cio-das1602/12",
1665                 .ai             = das16_ai_rinsn,
1666                 .ai_nbits       = 12,
1667                 .ai_speed       = 10000,
1668                 .ai_pg          = das16_pg_1602,
1669                 .ao             = das16_ao_winsn,
1670                 .ao_nbits       = 12,
1671                 .di             = das16_di_rbits,
1672                 .do_            = das16_do_wbits,
1673                 .i8255_offset   = 0x400,
1674                 .i8254_offset   = 0x0c,
1675                 .size           = 0x408,
1676                 .id             = 0xc0,
1677         }, {
1678                 .name           = "cio-das1602/16",
1679                 .ai             = das16_ai_rinsn,
1680                 .ai_nbits       = 16,
1681                 .ai_speed       = 10000,
1682                 .ai_pg          = das16_pg_1602,
1683                 .ao             = das16_ao_winsn,
1684                 .ao_nbits       = 12,
1685                 .di             = das16_di_rbits,
1686                 .do_            = das16_do_wbits,
1687                 .i8255_offset   = 0x400,
1688                 .i8254_offset   = 0x0c,
1689                 .size           = 0x408,
1690                 .id             = 0xc0,
1691         }, {
1692                 .name           = "cio-das16/330",
1693                 .ai             = das16_ai_rinsn,
1694                 .ai_nbits       = 12,
1695                 .ai_speed       = 3030,
1696                 .ai_pg          = das16_pg_16jr,
1697                 .ao             = NULL,
1698                 .di             = das16_di_rbits,
1699                 .do_            = das16_do_wbits,
1700                 .i8255_offset   = 0,
1701                 .i8254_offset   = 0x0c,
1702                 .size           = 0x14,
1703                 .id             = 0xf0,
1704         },
1705 };
1706
1707 static struct comedi_driver das16_driver = {
1708         .driver_name    = "das16",
1709         .module         = THIS_MODULE,
1710         .attach         = das16_attach,
1711         .detach         = das16_detach,
1712         .board_name     = &das16_boards[0].name,
1713         .num_names      = ARRAY_SIZE(das16_boards),
1714         .offset         = sizeof(das16_boards[0]),
1715 };
1716 module_comedi_driver(das16_driver);
1717
1718 MODULE_AUTHOR("Comedi http://www.comedi.org");
1719 MODULE_DESCRIPTION("Comedi low-level driver");
1720 MODULE_LICENSE("GPL");