1/* 2 comedi/drivers/das800.c 3 Driver for Keitley das800 series boards and compatibles 4 Copyright (C) 2000 Frank Mori Hess <fmhess@users.sourceforge.net> 5 6 COMEDI - Linux Control and Measurement Device Interface 7 Copyright (C) 2000 David A. Schleef <ds@schleef.org> 8 9 This program is free software; you can redistribute it and/or modify 10 it under the terms of the GNU General Public License as published by 11 the Free Software Foundation; either version 2 of the License, or 12 (at your option) any later version. 13 14 This program is distributed in the hope that it will be useful, 15 but WITHOUT ANY WARRANTY; without even the implied warranty of 16 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 17 GNU General Public License for more details. 18 19 You should have received a copy of the GNU General Public License 20 along with this program; if not, write to the Free Software 21 Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. 22 23************************************************************************ 24*/ 25/* 26Driver: das800 27Description: Keithley Metrabyte DAS800 (& compatibles) 28Author: Frank Mori Hess <fmhess@users.sourceforge.net> 29Devices: [Keithley Metrabyte] DAS-800 (das-800), DAS-801 (das-801), 30 DAS-802 (das-802), 31 [Measurement Computing] CIO-DAS800 (cio-das800), 32 CIO-DAS801 (cio-das801), CIO-DAS802 (cio-das802), 33 CIO-DAS802/16 (cio-das802/16) 34Status: works, cio-das802/16 untested - email me if you have tested it 35 36Configuration options: 37 [0] - I/O port base address 38 [1] - IRQ (optional, required for timed or externally triggered conversions) 39 40Notes: 41 IRQ can be omitted, although the cmd interface will not work without it. 42 43 All entries in the channel/gain list must use the same gain and be 44 consecutive channels counting upwards in channel number (these are 45 hardware limitations.) 46 47 I've never tested the gain setting stuff since I only have a 48 DAS-800 board with fixed gain. 49 50 The cio-das802/16 does not have a fifo-empty status bit! Therefore 51 only fifo-half-full transfers are possible with this card. 52*/ 53/* 54 55cmd triggers supported: 56 start_src: TRIG_NOW | TRIG_EXT 57 scan_begin_src: TRIG_FOLLOW 58 scan_end_src: TRIG_COUNT 59 convert_src: TRIG_TIMER | TRIG_EXT 60 stop_src: TRIG_NONE | TRIG_COUNT 61 62 63*/ 64 65#include <linux/interrupt.h> 66#include "../comedidev.h" 67 68#include <linux/ioport.h> 69#include <linux/delay.h> 70 71#include "8253.h" 72#include "comedi_fc.h" 73 74#define DAS800_SIZE 8 75#define TIMER_BASE 1000 76#define N_CHAN_AI 8 /* number of analog input channels */ 77 78/* Registers for the das800 */ 79 80#define DAS800_LSB 0 81#define FIFO_EMPTY 0x1 82#define FIFO_OVF 0x2 83#define DAS800_MSB 1 84#define DAS800_CONTROL1 2 85#define CONTROL1_INTE 0x8 86#define DAS800_CONV_CONTROL 2 87#define ITE 0x1 88#define CASC 0x2 89#define DTEN 0x4 90#define IEOC 0x8 91#define EACS 0x10 92#define CONV_HCEN 0x80 93#define DAS800_SCAN_LIMITS 2 94#define DAS800_STATUS 2 95#define IRQ 0x8 96#define BUSY 0x80 97#define DAS800_GAIN 3 98#define CIO_FFOV 0x8 /* fifo overflow for cio-das802/16 */ 99#define CIO_ENHF 0x90 /* interrupt fifo half full for cio-das802/16 */ 100#define CONTROL1 0x80 101#define CONV_CONTROL 0xa0 102#define SCAN_LIMITS 0xc0 103#define ID 0xe0 104#define DAS800_8254 4 105#define DAS800_STATUS2 7 106#define STATUS2_HCEN 0x80 107#define STATUS2_INTE 0X20 108#define DAS800_ID 7 109 110struct das800_board { 111 const char *name; 112 int ai_speed; 113 const struct comedi_lrange *ai_range; 114 int resolution; 115}; 116 117/* analog input ranges */ 118static const struct comedi_lrange range_das800_ai = { 119 1, 120 { 121 RANGE(-5, 5), 122 } 123}; 124 125static const struct comedi_lrange range_das801_ai = { 126 9, 127 { 128 RANGE(-5, 5), 129 RANGE(-10, 10), 130 RANGE(0, 10), 131 RANGE(-0.5, 0.5), 132 RANGE(0, 1), 133 RANGE(-0.05, 0.05), 134 RANGE(0, 0.1), 135 RANGE(-0.01, 0.01), 136 RANGE(0, 0.02), 137 } 138}; 139 140static const struct comedi_lrange range_cio_das801_ai = { 141 9, 142 { 143 RANGE(-5, 5), 144 RANGE(-10, 10), 145 RANGE(0, 10), 146 RANGE(-0.5, 0.5), 147 RANGE(0, 1), 148 RANGE(-0.05, 0.05), 149 RANGE(0, 0.1), 150 RANGE(-0.005, 0.005), 151 RANGE(0, 0.01), 152 } 153}; 154 155static const struct comedi_lrange range_das802_ai = { 156 9, 157 { 158 RANGE(-5, 5), 159 RANGE(-10, 10), 160 RANGE(0, 10), 161 RANGE(-2.5, 2.5), 162 RANGE(0, 5), 163 RANGE(-1.25, 1.25), 164 RANGE(0, 2.5), 165 RANGE(-0.625, 0.625), 166 RANGE(0, 1.25), 167 } 168}; 169 170static const struct comedi_lrange range_das80216_ai = { 171 8, 172 { 173 RANGE(-10, 10), 174 RANGE(0, 10), 175 RANGE(-5, 5), 176 RANGE(0, 5), 177 RANGE(-2.5, 2.5), 178 RANGE(0, 2.5), 179 RANGE(-1.25, 1.25), 180 RANGE(0, 1.25), 181 } 182}; 183 184enum { das800, ciodas800, das801, ciodas801, das802, ciodas802, ciodas80216 }; 185 186static const struct das800_board das800_boards[] = { 187 { 188 .name = "das-800", 189 .ai_speed = 25000, 190 .ai_range = &range_das800_ai, 191 .resolution = 12, 192 }, 193 { 194 .name = "cio-das800", 195 .ai_speed = 20000, 196 .ai_range = &range_das800_ai, 197 .resolution = 12, 198 }, 199 { 200 .name = "das-801", 201 .ai_speed = 25000, 202 .ai_range = &range_das801_ai, 203 .resolution = 12, 204 }, 205 { 206 .name = "cio-das801", 207 .ai_speed = 20000, 208 .ai_range = &range_cio_das801_ai, 209 .resolution = 12, 210 }, 211 { 212 .name = "das-802", 213 .ai_speed = 25000, 214 .ai_range = &range_das802_ai, 215 .resolution = 12, 216 }, 217 { 218 .name = "cio-das802", 219 .ai_speed = 20000, 220 .ai_range = &range_das802_ai, 221 .resolution = 12, 222 }, 223 { 224 .name = "cio-das802/16", 225 .ai_speed = 10000, 226 .ai_range = &range_das80216_ai, 227 .resolution = 16, 228 }, 229}; 230 231/* 232 * Useful for shorthand access to the particular board structure 233 */ 234#define thisboard ((const struct das800_board *)dev->board_ptr) 235 236struct das800_private { 237 volatile unsigned int count; /* number of data points left to be taken */ 238 volatile int forever; /* flag indicating whether we should take data forever */ 239 unsigned int divisor1; /* value to load into board's counter 1 for timed conversions */ 240 unsigned int divisor2; /* value to load into board's counter 2 for timed conversions */ 241 volatile int do_bits; /* digital output bits */ 242}; 243 244#define devpriv ((struct das800_private *)dev->private) 245 246static int das800_attach(struct comedi_device *dev, 247 struct comedi_devconfig *it); 248static int das800_detach(struct comedi_device *dev); 249static int das800_cancel(struct comedi_device *dev, struct comedi_subdevice *s); 250 251static struct comedi_driver driver_das800 = { 252 .driver_name = "das800", 253 .module = THIS_MODULE, 254 .attach = das800_attach, 255 .detach = das800_detach, 256 .num_names = ARRAY_SIZE(das800_boards), 257 .board_name = &das800_boards[0].name, 258 .offset = sizeof(struct das800_board), 259}; 260 261static irqreturn_t das800_interrupt(int irq, void *d); 262static void enable_das800(struct comedi_device *dev); 263static void disable_das800(struct comedi_device *dev); 264static int das800_ai_do_cmdtest(struct comedi_device *dev, 265 struct comedi_subdevice *s, 266 struct comedi_cmd *cmd); 267static int das800_ai_do_cmd(struct comedi_device *dev, 268 struct comedi_subdevice *s); 269static int das800_ai_rinsn(struct comedi_device *dev, 270 struct comedi_subdevice *s, struct comedi_insn *insn, 271 unsigned int *data); 272static int das800_di_rbits(struct comedi_device *dev, 273 struct comedi_subdevice *s, struct comedi_insn *insn, 274 unsigned int *data); 275static int das800_do_wbits(struct comedi_device *dev, 276 struct comedi_subdevice *s, struct comedi_insn *insn, 277 unsigned int *data); 278static int das800_probe(struct comedi_device *dev); 279static int das800_set_frequency(struct comedi_device *dev); 280 281/* checks and probes das-800 series board type */ 282static int das800_probe(struct comedi_device *dev) 283{ 284 int id_bits; 285 unsigned long irq_flags; 286 int board; 287 288 /* 'comedi spin lock irqsave' disables even rt interrupts, we use them to protect indirect addressing */ 289 spin_lock_irqsave(&dev->spinlock, irq_flags); 290 outb(ID, dev->iobase + DAS800_GAIN); /* select base address + 7 to be ID register */ 291 id_bits = inb(dev->iobase + DAS800_ID) & 0x3; /* get id bits */ 292 spin_unlock_irqrestore(&dev->spinlock, irq_flags); 293 294 board = thisboard - das800_boards; 295 296 switch (id_bits) { 297 case 0x0: 298 if (board == das800) { 299 printk(" Board model: DAS-800\n"); 300 return board; 301 } 302 if (board == ciodas800) { 303 printk(" Board model: CIO-DAS800\n"); 304 return board; 305 } 306 printk(" Board model (probed): DAS-800\n"); 307 return das800; 308 break; 309 case 0x2: 310 if (board == das801) { 311 printk(" Board model: DAS-801\n"); 312 return board; 313 } 314 if (board == ciodas801) { 315 printk(" Board model: CIO-DAS801\n"); 316 return board; 317 } 318 printk(" Board model (probed): DAS-801\n"); 319 return das801; 320 break; 321 case 0x3: 322 if (board == das802) { 323 printk(" Board model: DAS-802\n"); 324 return board; 325 } 326 if (board == ciodas802) { 327 printk(" Board model: CIO-DAS802\n"); 328 return board; 329 } 330 if (board == ciodas80216) { 331 printk(" Board model: CIO-DAS802/16\n"); 332 return board; 333 } 334 printk(" Board model (probed): DAS-802\n"); 335 return das802; 336 break; 337 default: 338 printk(" Board model: probe returned 0x%x (unknown)\n", 339 id_bits); 340 return board; 341 break; 342 } 343 return -1; 344} 345 346/* 347 * A convenient macro that defines init_module() and cleanup_module(), 348 * as necessary. 349 */ 350static int __init driver_das800_init_module(void) 351{ 352 return comedi_driver_register(&driver_das800); 353} 354 355static void __exit driver_das800_cleanup_module(void) 356{ 357 comedi_driver_unregister(&driver_das800); 358} 359 360module_init(driver_das800_init_module); 361module_exit(driver_das800_cleanup_module); 362 363/* interrupt service routine */ 364static irqreturn_t das800_interrupt(int irq, void *d) 365{ 366 short i; /* loop index */ 367 short dataPoint = 0; 368 struct comedi_device *dev = d; 369 struct comedi_subdevice *s = dev->read_subdev; /* analog input subdevice */ 370 struct comedi_async *async; 371 int status; 372 unsigned long irq_flags; 373 static const int max_loops = 128; /* half-fifo size for cio-das802/16 */ 374 /* flags */ 375 int fifo_empty = 0; 376 int fifo_overflow = 0; 377 378 status = inb(dev->iobase + DAS800_STATUS); 379 /* if interrupt was not generated by board or driver not attached, quit */ 380 if (!(status & IRQ)) 381 return IRQ_NONE; 382 if (!(dev->attached)) 383 return IRQ_HANDLED; 384 385 /* wait until here to initialize async, since we will get null dereference 386 * if interrupt occurs before driver is fully attached! 387 */ 388 async = s->async; 389 390 /* if hardware conversions are not enabled, then quit */ 391 spin_lock_irqsave(&dev->spinlock, irq_flags); 392 outb(CONTROL1, dev->iobase + DAS800_GAIN); /* select base address + 7 to be STATUS2 register */ 393 status = inb(dev->iobase + DAS800_STATUS2) & STATUS2_HCEN; 394 /* don't release spinlock yet since we want to make sure noone else disables hardware conversions */ 395 if (status == 0) { 396 spin_unlock_irqrestore(&dev->spinlock, irq_flags); 397 return IRQ_HANDLED; 398 } 399 400 /* loop while card's fifo is not empty (and limit to half fifo for cio-das802/16) */ 401 for (i = 0; i < max_loops; i++) { 402 /* read 16 bits from dev->iobase and dev->iobase + 1 */ 403 dataPoint = inb(dev->iobase + DAS800_LSB); 404 dataPoint += inb(dev->iobase + DAS800_MSB) << 8; 405 if (thisboard->resolution == 12) { 406 fifo_empty = dataPoint & FIFO_EMPTY; 407 fifo_overflow = dataPoint & FIFO_OVF; 408 if (fifo_overflow) 409 break; 410 } else { 411 fifo_empty = 0; /* cio-das802/16 has no fifo empty status bit */ 412 } 413 if (fifo_empty) 414 break; 415 /* strip off extraneous bits for 12 bit cards */ 416 if (thisboard->resolution == 12) 417 dataPoint = (dataPoint >> 4) & 0xfff; 418 /* if there are more data points to collect */ 419 if (devpriv->count > 0 || devpriv->forever == 1) { 420 /* write data point to buffer */ 421 cfc_write_to_buffer(s, dataPoint); 422 if (devpriv->count > 0) 423 devpriv->count--; 424 } 425 } 426 async->events |= COMEDI_CB_BLOCK; 427 /* check for fifo overflow */ 428 if (thisboard->resolution == 12) { 429 fifo_overflow = dataPoint & FIFO_OVF; 430 /* else cio-das802/16 */ 431 } else { 432 fifo_overflow = inb(dev->iobase + DAS800_GAIN) & CIO_FFOV; 433 } 434 if (fifo_overflow) { 435 spin_unlock_irqrestore(&dev->spinlock, irq_flags); 436 comedi_error(dev, "DAS800 FIFO overflow"); 437 das800_cancel(dev, dev->subdevices + 0); 438 async->events |= COMEDI_CB_ERROR | COMEDI_CB_EOA; 439 comedi_event(dev, s); 440 async->events = 0; 441 return IRQ_HANDLED; 442 } 443 if (devpriv->count > 0 || devpriv->forever == 1) { 444 /* Re-enable card's interrupt. 445 * We already have spinlock, so indirect addressing is safe */ 446 outb(CONTROL1, dev->iobase + DAS800_GAIN); /* select dev->iobase + 2 to be control register 1 */ 447 outb(CONTROL1_INTE | devpriv->do_bits, 448 dev->iobase + DAS800_CONTROL1); 449 spin_unlock_irqrestore(&dev->spinlock, irq_flags); 450 /* otherwise, stop taking data */ 451 } else { 452 spin_unlock_irqrestore(&dev->spinlock, irq_flags); 453 disable_das800(dev); /* diable hardware triggered conversions */ 454 async->events |= COMEDI_CB_EOA; 455 } 456 comedi_event(dev, s); 457 async->events = 0; 458 return IRQ_HANDLED; 459} 460 461static int das800_attach(struct comedi_device *dev, struct comedi_devconfig *it) 462{ 463 struct comedi_subdevice *s; 464 unsigned long iobase = it->options[0]; 465 unsigned int irq = it->options[1]; 466 unsigned long irq_flags; 467 int board; 468 469 printk("comedi%d: das800: io 0x%lx", dev->minor, iobase); 470 if (irq) 471 printk(", irq %u", irq); 472 printk("\n"); 473 474 /* allocate and initialize dev->private */ 475 if (alloc_private(dev, sizeof(struct das800_private)) < 0) 476 return -ENOMEM; 477 478 if (iobase == 0) { 479 printk("io base address required for das800\n"); 480 return -EINVAL; 481 } 482 483 /* check if io addresses are available */ 484 if (!request_region(iobase, DAS800_SIZE, "das800")) { 485 printk("I/O port conflict\n"); 486 return -EIO; 487 } 488 dev->iobase = iobase; 489 490 board = das800_probe(dev); 491 if (board < 0) { 492 printk("unable to determine board type\n"); 493 return -ENODEV; 494 } 495 dev->board_ptr = das800_boards + board; 496 497 /* grab our IRQ */ 498 if (irq == 1 || irq > 7) { 499 printk("irq out of range\n"); 500 return -EINVAL; 501 } 502 if (irq) { 503 if (request_irq(irq, das800_interrupt, 0, "das800", dev)) { 504 printk("unable to allocate irq %u\n", irq); 505 return -EINVAL; 506 } 507 } 508 dev->irq = irq; 509 510 dev->board_name = thisboard->name; 511 512 if (alloc_subdevices(dev, 3) < 0) 513 return -ENOMEM; 514 515 /* analog input subdevice */ 516 s = dev->subdevices + 0; 517 dev->read_subdev = s; 518 s->type = COMEDI_SUBD_AI; 519 s->subdev_flags = SDF_READABLE | SDF_GROUND | SDF_CMD_READ; 520 s->n_chan = 8; 521 s->len_chanlist = 8; 522 s->maxdata = (1 << thisboard->resolution) - 1; 523 s->range_table = thisboard->ai_range; 524 s->do_cmd = das800_ai_do_cmd; 525 s->do_cmdtest = das800_ai_do_cmdtest; 526 s->insn_read = das800_ai_rinsn; 527 s->cancel = das800_cancel; 528 529 /* di */ 530 s = dev->subdevices + 1; 531 s->type = COMEDI_SUBD_DI; 532 s->subdev_flags = SDF_READABLE; 533 s->n_chan = 3; 534 s->maxdata = 1; 535 s->range_table = &range_digital; 536 s->insn_bits = das800_di_rbits; 537 538 /* do */ 539 s = dev->subdevices + 2; 540 s->type = COMEDI_SUBD_DO; 541 s->subdev_flags = SDF_WRITABLE | SDF_READABLE; 542 s->n_chan = 4; 543 s->maxdata = 1; 544 s->range_table = &range_digital; 545 s->insn_bits = das800_do_wbits; 546 547 disable_das800(dev); 548 549 /* initialize digital out channels */ 550 spin_lock_irqsave(&dev->spinlock, irq_flags); 551 outb(CONTROL1, dev->iobase + DAS800_GAIN); /* select dev->iobase + 2 to be control register 1 */ 552 outb(CONTROL1_INTE | devpriv->do_bits, dev->iobase + DAS800_CONTROL1); 553 spin_unlock_irqrestore(&dev->spinlock, irq_flags); 554 555 return 0; 556}; 557 558static int das800_detach(struct comedi_device *dev) 559{ 560 printk("comedi%d: das800: remove\n", dev->minor); 561 562 /* only free stuff if it has been allocated by _attach */ 563 if (dev->iobase) 564 release_region(dev->iobase, DAS800_SIZE); 565 if (dev->irq) 566 free_irq(dev->irq, dev); 567 return 0; 568}; 569 570static int das800_cancel(struct comedi_device *dev, struct comedi_subdevice *s) 571{ 572 devpriv->forever = 0; 573 devpriv->count = 0; 574 disable_das800(dev); 575 return 0; 576} 577 578/* enable_das800 makes the card start taking hardware triggered conversions */ 579static void enable_das800(struct comedi_device *dev) 580{ 581 unsigned long irq_flags; 582 spin_lock_irqsave(&dev->spinlock, irq_flags); 583 /* enable fifo-half full interrupts for cio-das802/16 */ 584 if (thisboard->resolution == 16) 585 outb(CIO_ENHF, dev->iobase + DAS800_GAIN); 586 outb(CONV_CONTROL, dev->iobase + DAS800_GAIN); /* select dev->iobase + 2 to be conversion control register */ 587 outb(CONV_HCEN, dev->iobase + DAS800_CONV_CONTROL); /* enable hardware triggering */ 588 outb(CONTROL1, dev->iobase + DAS800_GAIN); /* select dev->iobase + 2 to be control register 1 */ 589 outb(CONTROL1_INTE | devpriv->do_bits, dev->iobase + DAS800_CONTROL1); /* enable card's interrupt */ 590 spin_unlock_irqrestore(&dev->spinlock, irq_flags); 591} 592 593/* disable_das800 stops hardware triggered conversions */ 594static void disable_das800(struct comedi_device *dev) 595{ 596 unsigned long irq_flags; 597 spin_lock_irqsave(&dev->spinlock, irq_flags); 598 outb(CONV_CONTROL, dev->iobase + DAS800_GAIN); /* select dev->iobase + 2 to be conversion control register */ 599 outb(0x0, dev->iobase + DAS800_CONV_CONTROL); /* disable hardware triggering of conversions */ 600 spin_unlock_irqrestore(&dev->spinlock, irq_flags); 601} 602 603static int das800_ai_do_cmdtest(struct comedi_device *dev, 604 struct comedi_subdevice *s, 605 struct comedi_cmd *cmd) 606{ 607 int err = 0; 608 int tmp; 609 int gain, startChan; 610 int i; 611 612 /* step 1: make sure trigger sources are trivially valid */ 613 614 tmp = cmd->start_src; 615 cmd->start_src &= TRIG_NOW | TRIG_EXT; 616 if (!cmd->start_src || tmp != cmd->start_src) 617 err++; 618 619 tmp = cmd->scan_begin_src; 620 cmd->scan_begin_src &= TRIG_FOLLOW; 621 if (!cmd->scan_begin_src || tmp != cmd->scan_begin_src) 622 err++; 623 624 tmp = cmd->convert_src; 625 cmd->convert_src &= TRIG_TIMER | TRIG_EXT; 626 if (!cmd->convert_src || tmp != cmd->convert_src) 627 err++; 628 629 tmp = cmd->scan_end_src; 630 cmd->scan_end_src &= TRIG_COUNT; 631 if (!cmd->scan_end_src || tmp != cmd->scan_end_src) 632 err++; 633 634 tmp = cmd->stop_src; 635 cmd->stop_src &= TRIG_COUNT | TRIG_NONE; 636 if (!cmd->stop_src || tmp != cmd->stop_src) 637 err++; 638 639 if (err) 640 return 1; 641 642 /* step 2: make sure trigger sources are unique and mutually compatible */ 643 644 if (cmd->start_src != TRIG_NOW && cmd->start_src != TRIG_EXT) 645 err++; 646 if (cmd->convert_src != TRIG_TIMER && cmd->convert_src != TRIG_EXT) 647 err++; 648 if (cmd->stop_src != TRIG_COUNT && cmd->stop_src != TRIG_NONE) 649 err++; 650 651 if (err) 652 return 2; 653 654 /* step 3: make sure arguments are trivially compatible */ 655 656 if (cmd->start_arg != 0) { 657 cmd->start_arg = 0; 658 err++; 659 } 660 if (cmd->convert_src == TRIG_TIMER) { 661 if (cmd->convert_arg < thisboard->ai_speed) { 662 cmd->convert_arg = thisboard->ai_speed; 663 err++; 664 } 665 } 666 if (!cmd->chanlist_len) { 667 cmd->chanlist_len = 1; 668 err++; 669 } 670 if (cmd->scan_end_arg != cmd->chanlist_len) { 671 cmd->scan_end_arg = cmd->chanlist_len; 672 err++; 673 } 674 if (cmd->stop_src == TRIG_COUNT) { 675 if (!cmd->stop_arg) { 676 cmd->stop_arg = 1; 677 err++; 678 } 679 } else { /* TRIG_NONE */ 680 if (cmd->stop_arg != 0) { 681 cmd->stop_arg = 0; 682 err++; 683 } 684 } 685 686 if (err) 687 return 3; 688 689 /* step 4: fix up any arguments */ 690 691 if (cmd->convert_src == TRIG_TIMER) { 692 tmp = cmd->convert_arg; 693 /* calculate counter values that give desired timing */ 694 i8253_cascade_ns_to_timer_2div(TIMER_BASE, &(devpriv->divisor1), 695 &(devpriv->divisor2), 696 &(cmd->convert_arg), 697 cmd->flags & TRIG_ROUND_MASK); 698 if (tmp != cmd->convert_arg) 699 err++; 700 } 701 702 if (err) 703 return 4; 704 705 /* check channel/gain list against card's limitations */ 706 if (cmd->chanlist) { 707 gain = CR_RANGE(cmd->chanlist[0]); 708 startChan = CR_CHAN(cmd->chanlist[0]); 709 for (i = 1; i < cmd->chanlist_len; i++) { 710 if (CR_CHAN(cmd->chanlist[i]) != 711 (startChan + i) % N_CHAN_AI) { 712 comedi_error(dev, 713 "entries in chanlist must be consecutive channels, counting upwards\n"); 714 err++; 715 } 716 if (CR_RANGE(cmd->chanlist[i]) != gain) { 717 comedi_error(dev, 718 "entries in chanlist must all have the same gain\n"); 719 err++; 720 } 721 } 722 } 723 724 if (err) 725 return 5; 726 727 return 0; 728} 729 730static int das800_ai_do_cmd(struct comedi_device *dev, 731 struct comedi_subdevice *s) 732{ 733 int startChan, endChan, scan, gain; 734 int conv_bits; 735 unsigned long irq_flags; 736 struct comedi_async *async = s->async; 737 738 if (!dev->irq) { 739 comedi_error(dev, 740 "no irq assigned for das-800, cannot do hardware conversions"); 741 return -1; 742 } 743 744 disable_das800(dev); 745 746 /* set channel scan limits */ 747 startChan = CR_CHAN(async->cmd.chanlist[0]); 748 endChan = (startChan + async->cmd.chanlist_len - 1) % 8; 749 scan = (endChan << 3) | startChan; 750 751 spin_lock_irqsave(&dev->spinlock, irq_flags); 752 outb(SCAN_LIMITS, dev->iobase + DAS800_GAIN); /* select base address + 2 to be scan limits register */ 753 outb(scan, dev->iobase + DAS800_SCAN_LIMITS); /* set scan limits */ 754 spin_unlock_irqrestore(&dev->spinlock, irq_flags); 755 756 /* set gain */ 757 gain = CR_RANGE(async->cmd.chanlist[0]); 758 if (thisboard->resolution == 12 && gain > 0) 759 gain += 0x7; 760 gain &= 0xf; 761 outb(gain, dev->iobase + DAS800_GAIN); 762 763 switch (async->cmd.stop_src) { 764 case TRIG_COUNT: 765 devpriv->count = async->cmd.stop_arg * async->cmd.chanlist_len; 766 devpriv->forever = 0; 767 break; 768 case TRIG_NONE: 769 devpriv->forever = 1; 770 devpriv->count = 0; 771 break; 772 default: 773 break; 774 } 775 776 /* enable auto channel scan, send interrupts on end of conversion 777 * and set clock source to internal or external 778 */ 779 conv_bits = 0; 780 conv_bits |= EACS | IEOC; 781 if (async->cmd.start_src == TRIG_EXT) 782 conv_bits |= DTEN; 783 switch (async->cmd.convert_src) { 784 case TRIG_TIMER: 785 conv_bits |= CASC | ITE; 786 /* set conversion frequency */ 787 i8253_cascade_ns_to_timer_2div(TIMER_BASE, &(devpriv->divisor1), 788 &(devpriv->divisor2), 789 &(async->cmd.convert_arg), 790 async->cmd. 791 flags & TRIG_ROUND_MASK); 792 if (das800_set_frequency(dev) < 0) { 793 comedi_error(dev, "Error setting up counters"); 794 return -1; 795 } 796 break; 797 case TRIG_EXT: 798 break; 799 default: 800 break; 801 } 802 803 spin_lock_irqsave(&dev->spinlock, irq_flags); 804 outb(CONV_CONTROL, dev->iobase + DAS800_GAIN); /* select dev->iobase + 2 to be conversion control register */ 805 outb(conv_bits, dev->iobase + DAS800_CONV_CONTROL); 806 spin_unlock_irqrestore(&dev->spinlock, irq_flags); 807 async->events = 0; 808 enable_das800(dev); 809 return 0; 810} 811 812static int das800_ai_rinsn(struct comedi_device *dev, 813 struct comedi_subdevice *s, struct comedi_insn *insn, 814 unsigned int *data) 815{ 816 int i, n; 817 int chan; 818 int range; 819 int lsb, msb; 820 int timeout = 1000; 821 unsigned long irq_flags; 822 823 disable_das800(dev); /* disable hardware conversions (enables software conversions) */ 824 825 /* set multiplexer */ 826 chan = CR_CHAN(insn->chanspec); 827 828 spin_lock_irqsave(&dev->spinlock, irq_flags); 829 outb(CONTROL1, dev->iobase + DAS800_GAIN); /* select dev->iobase + 2 to be control register 1 */ 830 outb(chan | devpriv->do_bits, dev->iobase + DAS800_CONTROL1); 831 spin_unlock_irqrestore(&dev->spinlock, irq_flags); 832 833 /* set gain / range */ 834 range = CR_RANGE(insn->chanspec); 835 if (thisboard->resolution == 12 && range) 836 range += 0x7; 837 range &= 0xf; 838 outb(range, dev->iobase + DAS800_GAIN); 839 840 udelay(5); 841 842 for (n = 0; n < insn->n; n++) { 843 /* trigger conversion */ 844 outb_p(0, dev->iobase + DAS800_MSB); 845 846 for (i = 0; i < timeout; i++) { 847 if (!(inb(dev->iobase + DAS800_STATUS) & BUSY)) 848 break; 849 } 850 if (i == timeout) { 851 comedi_error(dev, "timeout"); 852 return -ETIME; 853 } 854 lsb = inb(dev->iobase + DAS800_LSB); 855 msb = inb(dev->iobase + DAS800_MSB); 856 if (thisboard->resolution == 12) { 857 data[n] = (lsb >> 4) & 0xff; 858 data[n] |= (msb << 4); 859 } else { 860 data[n] = (msb << 8) | lsb; 861 } 862 } 863 864 return n; 865} 866 867static int das800_di_rbits(struct comedi_device *dev, 868 struct comedi_subdevice *s, struct comedi_insn *insn, 869 unsigned int *data) 870{ 871 unsigned int bits; 872 873 bits = inb(dev->iobase + DAS800_STATUS) >> 4; 874 bits &= 0x7; 875 data[1] = bits; 876 data[0] = 0; 877 878 return 2; 879} 880 881static int das800_do_wbits(struct comedi_device *dev, 882 struct comedi_subdevice *s, struct comedi_insn *insn, 883 unsigned int *data) 884{ 885 int wbits; 886 unsigned long irq_flags; 887 888 /* only set bits that have been masked */ 889 data[0] &= 0xf; 890 wbits = devpriv->do_bits >> 4; 891 wbits &= ~data[0]; 892 wbits |= data[0] & data[1]; 893 devpriv->do_bits = wbits << 4; 894 895 spin_lock_irqsave(&dev->spinlock, irq_flags); 896 outb(CONTROL1, dev->iobase + DAS800_GAIN); /* select dev->iobase + 2 to be control register 1 */ 897 outb(devpriv->do_bits | CONTROL1_INTE, dev->iobase + DAS800_CONTROL1); 898 spin_unlock_irqrestore(&dev->spinlock, irq_flags); 899 900 data[1] = wbits; 901 902 return 2; 903} 904 905/* loads counters with divisor1, divisor2 from private structure */ 906static int das800_set_frequency(struct comedi_device *dev) 907{ 908 int err = 0; 909 910 if (i8254_load(dev->iobase + DAS800_8254, 0, 1, devpriv->divisor1, 2)) 911 err++; 912 if (i8254_load(dev->iobase + DAS800_8254, 0, 2, devpriv->divisor2, 2)) 913 err++; 914 if (err) 915 return -1; 916 917 return 0; 918} 919 920MODULE_AUTHOR("Comedi http://www.comedi.org"); 921MODULE_DESCRIPTION("Comedi low-level driver"); 922MODULE_LICENSE("GPL"); 923