dmm32at.c revision 20962c10c19862c58c03eec2434279a5d104c40e
1/* 2 comedi/drivers/dmm32at.c 3 Diamond Systems mm32at code for a Comedi driver 4 5 COMEDI - Linux Control and Measurement Device Interface 6 Copyright (C) 2000 David A. Schleef <ds@schleef.org> 7 8 This program is free software; you can redistribute it and/or modify 9 it under the terms of the GNU General Public License as published by 10 the Free Software Foundation; either version 2 of the License, or 11 (at your option) any later version. 12 13 This program is distributed in the hope that it will be useful, 14 but WITHOUT ANY WARRANTY; without even the implied warranty of 15 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 16 GNU General Public License for more details. 17 18 You should have received a copy of the GNU General Public License 19 along with this program; if not, write to the Free Software 20 Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. 21 22*/ 23/* 24Driver: dmm32at 25Description: Diamond Systems mm32at driver. 26Devices: 27Author: Perry J. Piplani <perry.j.piplani@nasa.gov> 28Updated: Fri Jun 4 09:13:24 CDT 2004 29Status: experimental 30 31This driver is for the Diamond Systems MM-32-AT board 32http://www.diamondsystems.com/products/diamondmm32at It is being used 33on serveral projects inside NASA, without problems so far. For analog 34input commands, TRIG_EXT is not yet supported at all.. 35 36Configuration Options: 37 comedi_config /dev/comedi0 dmm32at baseaddr,irq 38*/ 39 40/* 41 * The previous block comment is used to automatically generate 42 * documentation in Comedi and Comedilib. The fields: 43 * 44 * Driver: the name of the driver 45 * Description: a short phrase describing the driver. Don't list boards. 46 * Devices: a full list of the boards that attempt to be supported by 47 * the driver. Format is "(manufacturer) board name [comedi name]", 48 * where comedi_name is the name that is used to configure the board. 49 * See the comment near board_name: in the struct comedi_driver structure 50 * below. If (manufacturer) or [comedi name] is missing, the previous 51 * value is used. 52 * Author: you 53 * Updated: date when the _documentation_ was last updated. Use 'date -R' 54 * to get a value for this. 55 * Status: a one-word description of the status. Valid values are: 56 * works - driver works correctly on most boards supported, and 57 * passes comedi_test. 58 * unknown - unknown. Usually put there by ds. 59 * experimental - may not work in any particular release. Author 60 * probably wants assistance testing it. 61 * bitrotten - driver has not been update in a long time, probably 62 * doesn't work, and probably is missing support for significant 63 * Comedi interface features. 64 * untested - author probably wrote it "blind", and is believed to 65 * work, but no confirmation. 66 * 67 * These headers should be followed by a blank line, and any comments 68 * you wish to say about the driver. The comment area is the place 69 * to put any known bugs, limitations, unsupported features, supported 70 * command triggers, whether or not commands are supported on particular 71 * subdevices, etc. 72 * 73 * Somewhere in the comment should be information about configuration 74 * options that are used with comedi_config. 75 */ 76 77#include <linux/interrupt.h> 78#include "../comedidev.h" 79#include <linux/ioport.h> 80 81/* Board register addresses */ 82 83#define DMM32AT_MEMSIZE 0x10 84 85#define DMM32AT_CONV 0x00 86#define DMM32AT_AILSB 0x00 87#define DMM32AT_AUXDOUT 0x01 88#define DMM32AT_AIMSB 0x01 89#define DMM32AT_AILOW 0x02 90#define DMM32AT_AIHIGH 0x03 91 92#define DMM32AT_DACLSB 0x04 93#define DMM32AT_DACSTAT 0x04 94#define DMM32AT_DACMSB 0x05 95 96#define DMM32AT_FIFOCNTRL 0x07 97#define DMM32AT_FIFOSTAT 0x07 98 99#define DMM32AT_CNTRL 0x08 100#define DMM32AT_AISTAT 0x08 101 102#define DMM32AT_INTCLOCK 0x09 103 104#define DMM32AT_CNTRDIO 0x0a 105 106#define DMM32AT_AICONF 0x0b 107#define DMM32AT_AIRBACK 0x0b 108 109#define DMM32AT_CLK1 0x0d 110#define DMM32AT_CLK2 0x0e 111#define DMM32AT_CLKCT 0x0f 112 113#define DMM32AT_DIOA 0x0c 114#define DMM32AT_DIOB 0x0d 115#define DMM32AT_DIOC 0x0e 116#define DMM32AT_DIOCONF 0x0f 117 118#define dmm_inb(cdev, reg) inb((cdev->iobase)+reg) 119#define dmm_outb(cdev, reg, valu) outb(valu, (cdev->iobase)+reg) 120 121/* Board register values. */ 122 123/* DMM32AT_DACSTAT 0x04 */ 124#define DMM32AT_DACBUSY 0x80 125 126/* DMM32AT_FIFOCNTRL 0x07 */ 127#define DMM32AT_FIFORESET 0x02 128#define DMM32AT_SCANENABLE 0x04 129 130/* DMM32AT_CNTRL 0x08 */ 131#define DMM32AT_RESET 0x20 132#define DMM32AT_INTRESET 0x08 133#define DMM32AT_CLKACC 0x00 134#define DMM32AT_DIOACC 0x01 135 136/* DMM32AT_AISTAT 0x08 */ 137#define DMM32AT_STATUS 0x80 138 139/* DMM32AT_INTCLOCK 0x09 */ 140#define DMM32AT_ADINT 0x80 141#define DMM32AT_CLKSEL 0x03 142 143/* DMM32AT_CNTRDIO 0x0a */ 144#define DMM32AT_FREQ12 0x80 145 146/* DMM32AT_AICONF 0x0b */ 147#define DMM32AT_RANGE_U10 0x0c 148#define DMM32AT_RANGE_U5 0x0d 149#define DMM32AT_RANGE_B10 0x08 150#define DMM32AT_RANGE_B5 0x00 151#define DMM32AT_SCINT_20 0x00 152#define DMM32AT_SCINT_15 0x10 153#define DMM32AT_SCINT_10 0x20 154#define DMM32AT_SCINT_5 0x30 155 156/* DMM32AT_CLKCT 0x0f */ 157#define DMM32AT_CLKCT1 0x56 /* mode3 counter 1 - write low byte only */ 158#define DMM32AT_CLKCT2 0xb6 /* mode3 counter 2 - write high and low byte */ 159 160/* DMM32AT_DIOCONF 0x0f */ 161#define DMM32AT_DIENABLE 0x80 162#define DMM32AT_DIRA 0x10 163#define DMM32AT_DIRB 0x02 164#define DMM32AT_DIRCL 0x01 165#define DMM32AT_DIRCH 0x08 166 167/* board AI ranges in comedi structure */ 168static const struct comedi_lrange dmm32at_airanges = { 169 4, 170 { 171 UNI_RANGE(10), 172 UNI_RANGE(5), 173 BIP_RANGE(10), 174 BIP_RANGE(5), 175 } 176}; 177 178/* register values for above ranges */ 179static const unsigned char dmm32at_rangebits[] = { 180 DMM32AT_RANGE_U10, 181 DMM32AT_RANGE_U5, 182 DMM32AT_RANGE_B10, 183 DMM32AT_RANGE_B5, 184}; 185 186/* only one of these ranges is valid, as set by a jumper on the 187 * board. The application should only use the range set by the jumper 188 */ 189static const struct comedi_lrange dmm32at_aoranges = { 190 4, 191 { 192 UNI_RANGE(10), 193 UNI_RANGE(5), 194 BIP_RANGE(10), 195 BIP_RANGE(5), 196 } 197}; 198 199/* 200 * Board descriptions for two imaginary boards. Describing the 201 * boards in this way is optional, and completely driver-dependent. 202 * Some drivers use arrays such as this, other do not. 203 */ 204struct dmm32at_board { 205 const char *name; 206 int ai_chans; 207 int ai_bits; 208 const struct comedi_lrange *ai_ranges; 209 int ao_chans; 210 int ao_bits; 211 const struct comedi_lrange *ao_ranges; 212 int have_dio; 213 int dio_chans; 214}; 215static const struct dmm32at_board dmm32at_boards[] = { 216 { 217 .name = "dmm32at", 218 .ai_chans = 32, 219 .ai_bits = 16, 220 .ai_ranges = &dmm32at_airanges, 221 .ao_chans = 4, 222 .ao_bits = 12, 223 .ao_ranges = &dmm32at_aoranges, 224 .have_dio = 1, 225 .dio_chans = 24, 226 }, 227}; 228 229/* 230 * Useful for shorthand access to the particular board structure 231 */ 232#define thisboard ((const struct dmm32at_board *)dev->board_ptr) 233 234/* this structure is for data unique to this hardware driver. If 235 * several hardware drivers keep similar information in this structure, 236 * feel free to suggest moving the variable to the struct comedi_device struct. 237 */ 238struct dmm32at_private { 239 240 int data; 241 int ai_inuse; 242 unsigned int ai_scans_left; 243 244 /* Used for AO readback */ 245 unsigned int ao_readback[4]; 246 unsigned char dio_config; 247 248}; 249 250/* 251 * most drivers define the following macro to make it easy to 252 * access the private structure. 253 */ 254#define devpriv ((struct dmm32at_private *)dev->private) 255 256/* 257 * The struct comedi_driver structure tells the Comedi core module 258 * which functions to call to configure/deconfigure (attach/detach) 259 * the board, and also about the kernel module that contains 260 * the device code. 261 */ 262static int dmm32at_attach(struct comedi_device *dev, 263 struct comedi_devconfig *it); 264static int dmm32at_detach(struct comedi_device *dev); 265static struct comedi_driver driver_dmm32at = { 266 .driver_name = "dmm32at", 267 .module = THIS_MODULE, 268 .attach = dmm32at_attach, 269 .detach = dmm32at_detach, 270/* It is not necessary to implement the following members if you are 271 * writing a driver for a ISA PnP or PCI card */ 272/* Most drivers will support multiple types of boards by 273 * having an array of board structures. These were defined 274 * in dmm32at_boards[] above. Note that the element 'name' 275 * was first in the structure -- Comedi uses this fact to 276 * extract the name of the board without knowing any details 277 * about the structure except for its length. 278 * When a device is attached (by comedi_config), the name 279 * of the device is given to Comedi, and Comedi tries to 280 * match it by going through the list of board names. If 281 * there is a match, the address of the pointer is put 282 * into dev->board_ptr and driver->attach() is called. 283 * 284 * Note that these are not necessary if you can determine 285 * the type of board in software. ISA PnP, PCI, and PCMCIA 286 * devices are such boards. 287 */ 288 .board_name = &dmm32at_boards[0].name, 289 .offset = sizeof(struct dmm32at_board), 290 .num_names = ARRAY_SIZE(dmm32at_boards), 291}; 292 293/* prototypes for driver functions below */ 294static int dmm32at_ai_rinsn(struct comedi_device *dev, 295 struct comedi_subdevice *s, 296 struct comedi_insn *insn, unsigned int *data); 297static int dmm32at_ao_winsn(struct comedi_device *dev, 298 struct comedi_subdevice *s, 299 struct comedi_insn *insn, unsigned int *data); 300static int dmm32at_ao_rinsn(struct comedi_device *dev, 301 struct comedi_subdevice *s, 302 struct comedi_insn *insn, unsigned int *data); 303static int dmm32at_dio_insn_bits(struct comedi_device *dev, 304 struct comedi_subdevice *s, 305 struct comedi_insn *insn, unsigned int *data); 306static int dmm32at_dio_insn_config(struct comedi_device *dev, 307 struct comedi_subdevice *s, 308 struct comedi_insn *insn, 309 unsigned int *data); 310static int dmm32at_ai_cmdtest(struct comedi_device *dev, 311 struct comedi_subdevice *s, 312 struct comedi_cmd *cmd); 313static int dmm32at_ai_cmd(struct comedi_device *dev, 314 struct comedi_subdevice *s); 315static int dmm32at_ai_cancel(struct comedi_device *dev, 316 struct comedi_subdevice *s); 317static int dmm32at_ns_to_timer(unsigned int *ns, int round); 318static irqreturn_t dmm32at_isr(int irq, void *d); 319void dmm32at_setaitimer(struct comedi_device *dev, unsigned int nansec); 320 321/* 322 * Attach is called by the Comedi core to configure the driver 323 * for a particular board. If you specified a board_name array 324 * in the driver structure, dev->board_ptr contains that 325 * address. 326 */ 327static int dmm32at_attach(struct comedi_device *dev, 328 struct comedi_devconfig *it) 329{ 330 int ret; 331 struct comedi_subdevice *s; 332 unsigned char aihi, ailo, fifostat, aistat, intstat, airback; 333 unsigned long iobase; 334 unsigned int irq; 335 336 iobase = it->options[0]; 337 irq = it->options[1]; 338 339 printk("comedi%d: dmm32at: attaching\n", dev->minor); 340 printk("dmm32at: probing at address 0x%04lx, irq %u\n", iobase, irq); 341 342 /* register address space */ 343 if (!request_region(iobase, DMM32AT_MEMSIZE, thisboard->name)) { 344 printk("I/O port conflict\n"); 345 return -EIO; 346 } 347 dev->iobase = iobase; 348 349 /* the following just makes sure the board is there and gets 350 it to a known state */ 351 352 /* reset the board */ 353 dmm_outb(dev, DMM32AT_CNTRL, DMM32AT_RESET); 354 355 /* allow a millisecond to reset */ 356 udelay(1000); 357 358 /* zero scan and fifo control */ 359 dmm_outb(dev, DMM32AT_FIFOCNTRL, 0x0); 360 361 /* zero interrupt and clock control */ 362 dmm_outb(dev, DMM32AT_INTCLOCK, 0x0); 363 364 /* write a test channel range, the high 3 bits should drop */ 365 dmm_outb(dev, DMM32AT_AILOW, 0x80); 366 dmm_outb(dev, DMM32AT_AIHIGH, 0xff); 367 368 /* set the range at 10v unipolar */ 369 dmm_outb(dev, DMM32AT_AICONF, DMM32AT_RANGE_U10); 370 371 /* should take 10 us to settle, here's a hundred */ 372 udelay(100); 373 374 /* read back the values */ 375 ailo = dmm_inb(dev, DMM32AT_AILOW); 376 aihi = dmm_inb(dev, DMM32AT_AIHIGH); 377 fifostat = dmm_inb(dev, DMM32AT_FIFOSTAT); 378 aistat = dmm_inb(dev, DMM32AT_AISTAT); 379 intstat = dmm_inb(dev, DMM32AT_INTCLOCK); 380 airback = dmm_inb(dev, DMM32AT_AIRBACK); 381 382 printk("dmm32at: lo=0x%02x hi=0x%02x fifostat=0x%02x\n", 383 ailo, aihi, fifostat); 384 printk("dmm32at: aistat=0x%02x intstat=0x%02x airback=0x%02x\n", 385 aistat, intstat, airback); 386 387 if ((ailo != 0x00) || (aihi != 0x1f) || (fifostat != 0x80) || 388 (aistat != 0x60 || (intstat != 0x00) || airback != 0x0c)) { 389 printk("dmmat32: board detection failed\n"); 390 return -EIO; 391 } 392 393 /* board is there, register interrupt */ 394 if (irq) { 395 ret = request_irq(irq, dmm32at_isr, 0, thisboard->name, dev); 396 if (ret < 0) { 397 printk("irq conflict\n"); 398 return ret; 399 } 400 dev->irq = irq; 401 } 402 403/* 404 * If you can probe the device to determine what device in a series 405 * it is, this is the place to do it. Otherwise, dev->board_ptr 406 * should already be initialized. 407 */ 408 /* dev->board_ptr = dmm32at_probe(dev); */ 409 410/* 411 * Initialize dev->board_name. Note that we can use the "thisboard" 412 * macro now, since we just initialized it in the last line. 413 */ 414 dev->board_name = thisboard->name; 415 416/* 417 * Allocate the private structure area. alloc_private() is a 418 * convenient macro defined in comedidev.h. 419 */ 420 if (alloc_private(dev, sizeof(struct dmm32at_private)) < 0) 421 return -ENOMEM; 422 423/* 424 * Allocate the subdevice structures. alloc_subdevice() is a 425 * convenient macro defined in comedidev.h. 426 */ 427 if (alloc_subdevices(dev, 3) < 0) 428 return -ENOMEM; 429 430 s = dev->subdevices + 0; 431 dev->read_subdev = s; 432 /* analog input subdevice */ 433 s->type = COMEDI_SUBD_AI; 434 /* we support single-ended (ground) and differential */ 435 s->subdev_flags = SDF_READABLE | SDF_GROUND | SDF_DIFF | SDF_CMD_READ; 436 s->n_chan = thisboard->ai_chans; 437 s->maxdata = (1 << thisboard->ai_bits) - 1; 438 s->range_table = thisboard->ai_ranges; 439 s->len_chanlist = 32; /* This is the maximum chanlist length that 440 the board can handle */ 441 s->insn_read = dmm32at_ai_rinsn; 442 s->do_cmd = dmm32at_ai_cmd; 443 s->do_cmdtest = dmm32at_ai_cmdtest; 444 s->cancel = dmm32at_ai_cancel; 445 446 s = dev->subdevices + 1; 447 /* analog output subdevice */ 448 s->type = COMEDI_SUBD_AO; 449 s->subdev_flags = SDF_WRITABLE; 450 s->n_chan = thisboard->ao_chans; 451 s->maxdata = (1 << thisboard->ao_bits) - 1; 452 s->range_table = thisboard->ao_ranges; 453 s->insn_write = dmm32at_ao_winsn; 454 s->insn_read = dmm32at_ao_rinsn; 455 456 s = dev->subdevices + 2; 457 /* digital i/o subdevice */ 458 if (thisboard->have_dio) { 459 460 /* get access to the DIO regs */ 461 dmm_outb(dev, DMM32AT_CNTRL, DMM32AT_DIOACC); 462 /* set the DIO's to the defualt input setting */ 463 devpriv->dio_config = DMM32AT_DIRA | DMM32AT_DIRB | 464 DMM32AT_DIRCL | DMM32AT_DIRCH | DMM32AT_DIENABLE; 465 dmm_outb(dev, DMM32AT_DIOCONF, devpriv->dio_config); 466 467 /* set up the subdevice */ 468 s->type = COMEDI_SUBD_DIO; 469 s->subdev_flags = SDF_READABLE | SDF_WRITABLE; 470 s->n_chan = thisboard->dio_chans; 471 s->maxdata = 1; 472 s->state = 0; 473 s->range_table = &range_digital; 474 s->insn_bits = dmm32at_dio_insn_bits; 475 s->insn_config = dmm32at_dio_insn_config; 476 } else { 477 s->type = COMEDI_SUBD_UNUSED; 478 } 479 480 /* success */ 481 printk("comedi%d: dmm32at: attached\n", dev->minor); 482 483 return 1; 484 485} 486 487/* 488 * _detach is called to deconfigure a device. It should deallocate 489 * resources. 490 * This function is also called when _attach() fails, so it should be 491 * careful not to release resources that were not necessarily 492 * allocated by _attach(). dev->private and dev->subdevices are 493 * deallocated automatically by the core. 494 */ 495static int dmm32at_detach(struct comedi_device *dev) 496{ 497 printk("comedi%d: dmm32at: remove\n", dev->minor); 498 if (dev->irq) 499 free_irq(dev->irq, dev); 500 if (dev->iobase) 501 release_region(dev->iobase, DMM32AT_MEMSIZE); 502 503 return 0; 504} 505 506/* 507 * "instructions" read/write data in "one-shot" or "software-triggered" 508 * mode. 509 */ 510 511static int dmm32at_ai_rinsn(struct comedi_device *dev, 512 struct comedi_subdevice *s, 513 struct comedi_insn *insn, unsigned int *data) 514{ 515 int n, i; 516 unsigned int d; 517 unsigned char status; 518 unsigned short msb, lsb; 519 unsigned char chan; 520 int range; 521 522 /* get the channel and range number */ 523 524 chan = CR_CHAN(insn->chanspec) & (s->n_chan - 1); 525 range = CR_RANGE(insn->chanspec); 526 527 /* printk("channel=0x%02x, range=%d\n",chan,range); */ 528 529 /* zero scan and fifo control and reset fifo */ 530 dmm_outb(dev, DMM32AT_FIFOCNTRL, DMM32AT_FIFORESET); 531 532 /* write the ai channel range regs */ 533 dmm_outb(dev, DMM32AT_AILOW, chan); 534 dmm_outb(dev, DMM32AT_AIHIGH, chan); 535 /* set the range bits */ 536 dmm_outb(dev, DMM32AT_AICONF, dmm32at_rangebits[range]); 537 538 /* wait for circuit to settle */ 539 for (i = 0; i < 40000; i++) { 540 status = dmm_inb(dev, DMM32AT_AIRBACK); 541 if ((status & DMM32AT_STATUS) == 0) 542 break; 543 } 544 if (i == 40000) { 545 printk("timeout\n"); 546 return -ETIMEDOUT; 547 } 548 549 /* convert n samples */ 550 for (n = 0; n < insn->n; n++) { 551 /* trigger conversion */ 552 dmm_outb(dev, DMM32AT_CONV, 0xff); 553 /* wait for conversion to end */ 554 for (i = 0; i < 40000; i++) { 555 status = dmm_inb(dev, DMM32AT_AISTAT); 556 if ((status & DMM32AT_STATUS) == 0) 557 break; 558 } 559 if (i == 40000) { 560 printk("timeout\n"); 561 return -ETIMEDOUT; 562 } 563 564 /* read data */ 565 lsb = dmm_inb(dev, DMM32AT_AILSB); 566 msb = dmm_inb(dev, DMM32AT_AIMSB); 567 568 /* invert sign bit to make range unsigned, this is an 569 idiosyncracy of the diamond board, it return 570 conversions as a signed value, i.e. -32768 to 571 32767, flipping the bit and interpreting it as 572 signed gives you a range of 0 to 65535 which is 573 used by comedi */ 574 d = ((msb ^ 0x0080) << 8) + lsb; 575 576 data[n] = d; 577 } 578 579 /* return the number of samples read/written */ 580 return n; 581} 582 583static int dmm32at_ai_cmdtest(struct comedi_device *dev, 584 struct comedi_subdevice *s, 585 struct comedi_cmd *cmd) 586{ 587 int err = 0; 588 int tmp; 589 int start_chan, gain, i; 590 591 /* printk("dmmat32 in command test\n"); */ 592 593 /* cmdtest tests a particular command to see if it is valid. 594 * Using the cmdtest ioctl, a user can create a valid cmd 595 * and then have it executes by the cmd ioctl. 596 * 597 * cmdtest returns 1,2,3,4 or 0, depending on which tests 598 * the command passes. */ 599 600 /* step 1: make sure trigger sources are trivially valid */ 601 602 tmp = cmd->start_src; 603 cmd->start_src &= TRIG_NOW; 604 if (!cmd->start_src || tmp != cmd->start_src) 605 err++; 606 607 tmp = cmd->scan_begin_src; 608 cmd->scan_begin_src &= TRIG_TIMER /*| TRIG_EXT */ ; 609 if (!cmd->scan_begin_src || tmp != cmd->scan_begin_src) 610 err++; 611 612 tmp = cmd->convert_src; 613 cmd->convert_src &= TRIG_TIMER /*| TRIG_EXT */ ; 614 if (!cmd->convert_src || tmp != cmd->convert_src) 615 err++; 616 617 tmp = cmd->scan_end_src; 618 cmd->scan_end_src &= TRIG_COUNT; 619 if (!cmd->scan_end_src || tmp != cmd->scan_end_src) 620 err++; 621 622 tmp = cmd->stop_src; 623 cmd->stop_src &= TRIG_COUNT | TRIG_NONE; 624 if (!cmd->stop_src || tmp != cmd->stop_src) 625 err++; 626 627 if (err) 628 return 1; 629 630 /* step 2: make sure trigger sources are unique and mutually compatible */ 631 632 /* note that mutual compatibility is not an issue here */ 633 if (cmd->scan_begin_src != TRIG_TIMER && 634 cmd->scan_begin_src != TRIG_EXT) 635 err++; 636 if (cmd->convert_src != TRIG_TIMER && cmd->convert_src != TRIG_EXT) 637 err++; 638 if (cmd->stop_src != TRIG_COUNT && cmd->stop_src != TRIG_NONE) 639 err++; 640 641 if (err) 642 return 2; 643 644 /* step 3: make sure arguments are trivially compatible */ 645 646 if (cmd->start_arg != 0) { 647 cmd->start_arg = 0; 648 err++; 649 } 650#define MAX_SCAN_SPEED 1000000 /* in nanoseconds */ 651#define MIN_SCAN_SPEED 1000000000 /* in nanoseconds */ 652 653 if (cmd->scan_begin_src == TRIG_TIMER) { 654 if (cmd->scan_begin_arg < MAX_SCAN_SPEED) { 655 cmd->scan_begin_arg = MAX_SCAN_SPEED; 656 err++; 657 } 658 if (cmd->scan_begin_arg > MIN_SCAN_SPEED) { 659 cmd->scan_begin_arg = MIN_SCAN_SPEED; 660 err++; 661 } 662 } else { 663 /* external trigger */ 664 /* should be level/edge, hi/lo specification here */ 665 /* should specify multiple external triggers */ 666 if (cmd->scan_begin_arg > 9) { 667 cmd->scan_begin_arg = 9; 668 err++; 669 } 670 } 671 if (cmd->convert_src == TRIG_TIMER) { 672 if (cmd->convert_arg >= 17500) 673 cmd->convert_arg = 20000; 674 else if (cmd->convert_arg >= 12500) 675 cmd->convert_arg = 15000; 676 else if (cmd->convert_arg >= 7500) 677 cmd->convert_arg = 10000; 678 else 679 cmd->convert_arg = 5000; 680 681 } else { 682 /* external trigger */ 683 /* see above */ 684 if (cmd->convert_arg > 9) { 685 cmd->convert_arg = 9; 686 err++; 687 } 688 } 689 690 if (cmd->scan_end_arg != cmd->chanlist_len) { 691 cmd->scan_end_arg = cmd->chanlist_len; 692 err++; 693 } 694 if (cmd->stop_src == TRIG_COUNT) { 695 if (cmd->stop_arg > 0xfffffff0) { 696 cmd->stop_arg = 0xfffffff0; 697 err++; 698 } 699 if (cmd->stop_arg == 0) { 700 cmd->stop_arg = 1; 701 err++; 702 } 703 } else { 704 /* TRIG_NONE */ 705 if (cmd->stop_arg != 0) { 706 cmd->stop_arg = 0; 707 err++; 708 } 709 } 710 711 if (err) 712 return 3; 713 714 /* step 4: fix up any arguments */ 715 716 if (cmd->scan_begin_src == TRIG_TIMER) { 717 tmp = cmd->scan_begin_arg; 718 dmm32at_ns_to_timer(&cmd->scan_begin_arg, 719 cmd->flags & TRIG_ROUND_MASK); 720 if (tmp != cmd->scan_begin_arg) 721 err++; 722 } 723 if (cmd->convert_src == TRIG_TIMER) { 724 tmp = cmd->convert_arg; 725 dmm32at_ns_to_timer(&cmd->convert_arg, 726 cmd->flags & TRIG_ROUND_MASK); 727 if (tmp != cmd->convert_arg) 728 err++; 729 if (cmd->scan_begin_src == TRIG_TIMER && 730 cmd->scan_begin_arg < 731 cmd->convert_arg * cmd->scan_end_arg) { 732 cmd->scan_begin_arg = 733 cmd->convert_arg * cmd->scan_end_arg; 734 err++; 735 } 736 } 737 738 if (err) 739 return 4; 740 741 /* step 5 check the channel list, the channel list for this 742 board must be consecutive and gains must be the same */ 743 744 if (cmd->chanlist) { 745 gain = CR_RANGE(cmd->chanlist[0]); 746 start_chan = CR_CHAN(cmd->chanlist[0]); 747 for (i = 1; i < cmd->chanlist_len; i++) { 748 if (CR_CHAN(cmd->chanlist[i]) != 749 (start_chan + i) % s->n_chan) { 750 comedi_error(dev, 751 "entries in chanlist must be consecutive channels, counting upwards\n"); 752 err++; 753 } 754 if (CR_RANGE(cmd->chanlist[i]) != gain) { 755 comedi_error(dev, 756 "entries in chanlist must all have the same gain\n"); 757 err++; 758 } 759 } 760 } 761 762 if (err) 763 return 5; 764 765 return 0; 766} 767 768static int dmm32at_ai_cmd(struct comedi_device *dev, struct comedi_subdevice *s) 769{ 770 struct comedi_cmd *cmd = &s->async->cmd; 771 int i, range; 772 unsigned char chanlo, chanhi, status; 773 774 if (!cmd->chanlist) 775 return -EINVAL; 776 777 /* get the channel list and range */ 778 chanlo = CR_CHAN(cmd->chanlist[0]) & (s->n_chan - 1); 779 chanhi = chanlo + cmd->chanlist_len - 1; 780 if (chanhi >= s->n_chan) 781 return -EINVAL; 782 range = CR_RANGE(cmd->chanlist[0]); 783 784 /* reset fifo */ 785 dmm_outb(dev, DMM32AT_FIFOCNTRL, DMM32AT_FIFORESET); 786 787 /* set scan enable */ 788 dmm_outb(dev, DMM32AT_FIFOCNTRL, DMM32AT_SCANENABLE); 789 790 /* write the ai channel range regs */ 791 dmm_outb(dev, DMM32AT_AILOW, chanlo); 792 dmm_outb(dev, DMM32AT_AIHIGH, chanhi); 793 794 /* set the range bits */ 795 dmm_outb(dev, DMM32AT_AICONF, dmm32at_rangebits[range]); 796 797 /* reset the interrupt just in case */ 798 dmm_outb(dev, DMM32AT_CNTRL, DMM32AT_INTRESET); 799 800 if (cmd->stop_src == TRIG_COUNT) 801 devpriv->ai_scans_left = cmd->stop_arg; 802 else { /* TRIG_NONE */ 803 devpriv->ai_scans_left = 0xffffffff; /* indicates TRIG_NONE to isr */ 804 } 805 806 /* wait for circuit to settle */ 807 for (i = 0; i < 40000; i++) { 808 status = dmm_inb(dev, DMM32AT_AIRBACK); 809 if ((status & DMM32AT_STATUS) == 0) 810 break; 811 } 812 if (i == 40000) { 813 printk("timeout\n"); 814 return -ETIMEDOUT; 815 } 816 817 if (devpriv->ai_scans_left > 1) { 818 /* start the clock and enable the interrupts */ 819 dmm32at_setaitimer(dev, cmd->scan_begin_arg); 820 } else { 821 /* start the interrups and initiate a single scan */ 822 dmm_outb(dev, DMM32AT_INTCLOCK, DMM32AT_ADINT); 823 dmm_outb(dev, DMM32AT_CONV, 0xff); 824 } 825 826/* printk("dmmat32 in command\n"); */ 827 828/* for(i=0;i<cmd->chanlist_len;i++) */ 829/* comedi_buf_put(s->async,i*100); */ 830 831/* s->async->events |= COMEDI_CB_EOA; */ 832/* comedi_event(dev, s); */ 833 834 return 0; 835 836} 837 838static int dmm32at_ai_cancel(struct comedi_device *dev, 839 struct comedi_subdevice *s) 840{ 841 devpriv->ai_scans_left = 1; 842 return 0; 843} 844 845static irqreturn_t dmm32at_isr(int irq, void *d) 846{ 847 unsigned char intstat; 848 unsigned int samp; 849 unsigned short msb, lsb; 850 int i; 851 struct comedi_device *dev = d; 852 853 if (!dev->attached) { 854 comedi_error(dev, "spurious interrupt"); 855 return IRQ_HANDLED; 856 } 857 858 intstat = dmm_inb(dev, DMM32AT_INTCLOCK); 859 860 if (intstat & DMM32AT_ADINT) { 861 struct comedi_subdevice *s = dev->read_subdev; 862 struct comedi_cmd *cmd = &s->async->cmd; 863 864 for (i = 0; i < cmd->chanlist_len; i++) { 865 /* read data */ 866 lsb = dmm_inb(dev, DMM32AT_AILSB); 867 msb = dmm_inb(dev, DMM32AT_AIMSB); 868 869 /* invert sign bit to make range unsigned */ 870 samp = ((msb ^ 0x0080) << 8) + lsb; 871 comedi_buf_put(s->async, samp); 872 } 873 874 if (devpriv->ai_scans_left != 0xffffffff) { /* TRIG_COUNT */ 875 devpriv->ai_scans_left--; 876 if (devpriv->ai_scans_left == 0) { 877 /* disable further interrupts and clocks */ 878 dmm_outb(dev, DMM32AT_INTCLOCK, 0x0); 879 /* set the buffer to be flushed with an EOF */ 880 s->async->events |= COMEDI_CB_EOA; 881 } 882 883 } 884 /* flush the buffer */ 885 comedi_event(dev, s); 886 } 887 888 /* reset the interrupt */ 889 dmm_outb(dev, DMM32AT_CNTRL, DMM32AT_INTRESET); 890 return IRQ_HANDLED; 891} 892 893/* This function doesn't require a particular form, this is just 894 * what happens to be used in some of the drivers. It should 895 * convert ns nanoseconds to a counter value suitable for programming 896 * the device. Also, it should adjust ns so that it cooresponds to 897 * the actual time that the device will use. */ 898static int dmm32at_ns_to_timer(unsigned int *ns, int round) 899{ 900 /* trivial timer */ 901 /* if your timing is done through two cascaded timers, the 902 * i8253_cascade_ns_to_timer() function in 8253.h can be 903 * very helpful. There are also i8254_load() and i8254_mm_load() 904 * which can be used to load values into the ubiquitous 8254 counters 905 */ 906 907 return *ns; 908} 909 910static int dmm32at_ao_winsn(struct comedi_device *dev, 911 struct comedi_subdevice *s, 912 struct comedi_insn *insn, unsigned int *data) 913{ 914 int i; 915 int chan = CR_CHAN(insn->chanspec); 916 unsigned char hi, lo, status; 917 918 /* Writing a list of values to an AO channel is probably not 919 * very useful, but that's how the interface is defined. */ 920 for (i = 0; i < insn->n; i++) { 921 922 devpriv->ao_readback[chan] = data[i]; 923 924 /* get the low byte */ 925 lo = data[i] & 0x00ff; 926 /* high byte also contains channel number */ 927 hi = (data[i] >> 8) + chan * (1 << 6); 928 /* printk("writing 0x%02x 0x%02x\n",hi,lo); */ 929 /* write the low and high values to the board */ 930 dmm_outb(dev, DMM32AT_DACLSB, lo); 931 dmm_outb(dev, DMM32AT_DACMSB, hi); 932 933 /* wait for circuit to settle */ 934 for (i = 0; i < 40000; i++) { 935 status = dmm_inb(dev, DMM32AT_DACSTAT); 936 if ((status & DMM32AT_DACBUSY) == 0) 937 break; 938 } 939 if (i == 40000) { 940 printk("timeout\n"); 941 return -ETIMEDOUT; 942 } 943 /* dummy read to update trigger the output */ 944 status = dmm_inb(dev, DMM32AT_DACMSB); 945 946 } 947 948 /* return the number of samples read/written */ 949 return i; 950} 951 952/* AO subdevices should have a read insn as well as a write insn. 953 * Usually this means copying a value stored in devpriv. */ 954static int dmm32at_ao_rinsn(struct comedi_device *dev, 955 struct comedi_subdevice *s, 956 struct comedi_insn *insn, unsigned int *data) 957{ 958 int i; 959 int chan = CR_CHAN(insn->chanspec); 960 961 for (i = 0; i < insn->n; i++) 962 data[i] = devpriv->ao_readback[chan]; 963 964 return i; 965} 966 967/* DIO devices are slightly special. Although it is possible to 968 * implement the insn_read/insn_write interface, it is much more 969 * useful to applications if you implement the insn_bits interface. 970 * This allows packed reading/writing of the DIO channels. The 971 * comedi core can convert between insn_bits and insn_read/write */ 972static int dmm32at_dio_insn_bits(struct comedi_device *dev, 973 struct comedi_subdevice *s, 974 struct comedi_insn *insn, unsigned int *data) 975{ 976 unsigned char diobits; 977 978 if (insn->n != 2) 979 return -EINVAL; 980 981 /* The insn data is a mask in data[0] and the new data 982 * in data[1], each channel cooresponding to a bit. */ 983 if (data[0]) { 984 s->state &= ~data[0]; 985 s->state |= data[0] & data[1]; 986 /* Write out the new digital output lines */ 987 /* outw(s->state,dev->iobase + DMM32AT_DIO); */ 988 } 989 990 /* get access to the DIO regs */ 991 dmm_outb(dev, DMM32AT_CNTRL, DMM32AT_DIOACC); 992 993 /* if either part of dio is set for output */ 994 if (((devpriv->dio_config & DMM32AT_DIRCL) == 0) || 995 ((devpriv->dio_config & DMM32AT_DIRCH) == 0)) { 996 diobits = (s->state & 0x00ff0000) >> 16; 997 dmm_outb(dev, DMM32AT_DIOC, diobits); 998 } 999 if ((devpriv->dio_config & DMM32AT_DIRB) == 0) { 1000 diobits = (s->state & 0x0000ff00) >> 8; 1001 dmm_outb(dev, DMM32AT_DIOB, diobits); 1002 } 1003 if ((devpriv->dio_config & DMM32AT_DIRA) == 0) { 1004 diobits = (s->state & 0x000000ff); 1005 dmm_outb(dev, DMM32AT_DIOA, diobits); 1006 } 1007 1008 /* now read the state back in */ 1009 s->state = dmm_inb(dev, DMM32AT_DIOC); 1010 s->state <<= 8; 1011 s->state |= dmm_inb(dev, DMM32AT_DIOB); 1012 s->state <<= 8; 1013 s->state |= dmm_inb(dev, DMM32AT_DIOA); 1014 data[1] = s->state; 1015 1016 /* on return, data[1] contains the value of the digital 1017 * input and output lines. */ 1018 /* data[1]=inw(dev->iobase + DMM32AT_DIO); */ 1019 /* or we could just return the software copy of the output values if 1020 * it was a purely digital output subdevice */ 1021 /* data[1]=s->state; */ 1022 1023 return 2; 1024} 1025 1026static int dmm32at_dio_insn_config(struct comedi_device *dev, 1027 struct comedi_subdevice *s, 1028 struct comedi_insn *insn, unsigned int *data) 1029{ 1030 unsigned char chanbit; 1031 int chan = CR_CHAN(insn->chanspec); 1032 1033 if (insn->n != 1) 1034 return -EINVAL; 1035 1036 if (chan < 8) 1037 chanbit = DMM32AT_DIRA; 1038 else if (chan < 16) 1039 chanbit = DMM32AT_DIRB; 1040 else if (chan < 20) 1041 chanbit = DMM32AT_DIRCL; 1042 else 1043 chanbit = DMM32AT_DIRCH; 1044 1045 /* The input or output configuration of each digital line is 1046 * configured by a special insn_config instruction. chanspec 1047 * contains the channel to be changed, and data[0] contains the 1048 * value COMEDI_INPUT or COMEDI_OUTPUT. */ 1049 1050 /* if output clear the bit, otherwise set it */ 1051 if (data[0] == COMEDI_OUTPUT) 1052 devpriv->dio_config &= ~chanbit; 1053 else 1054 devpriv->dio_config |= chanbit; 1055 /* get access to the DIO regs */ 1056 dmm_outb(dev, DMM32AT_CNTRL, DMM32AT_DIOACC); 1057 /* set the DIO's to the new configuration setting */ 1058 dmm_outb(dev, DMM32AT_DIOCONF, devpriv->dio_config); 1059 1060 return 1; 1061} 1062 1063void dmm32at_setaitimer(struct comedi_device *dev, unsigned int nansec) 1064{ 1065 unsigned char lo1, lo2, hi2; 1066 unsigned short both2; 1067 1068 /* based on 10mhz clock */ 1069 lo1 = 200; 1070 both2 = nansec / 20000; 1071 hi2 = (both2 & 0xff00) >> 8; 1072 lo2 = both2 & 0x00ff; 1073 1074 /* set the counter frequency to 10mhz */ 1075 dmm_outb(dev, DMM32AT_CNTRDIO, 0); 1076 1077 /* get access to the clock regs */ 1078 dmm_outb(dev, DMM32AT_CNTRL, DMM32AT_CLKACC); 1079 1080 /* write the counter 1 control word and low byte to counter */ 1081 dmm_outb(dev, DMM32AT_CLKCT, DMM32AT_CLKCT1); 1082 dmm_outb(dev, DMM32AT_CLK1, lo1); 1083 1084 /* write the counter 2 control word and low byte then to counter */ 1085 dmm_outb(dev, DMM32AT_CLKCT, DMM32AT_CLKCT2); 1086 dmm_outb(dev, DMM32AT_CLK2, lo2); 1087 dmm_outb(dev, DMM32AT_CLK2, hi2); 1088 1089 /* enable the ai conversion interrupt and the clock to start scans */ 1090 dmm_outb(dev, DMM32AT_INTCLOCK, DMM32AT_ADINT | DMM32AT_CLKSEL); 1091 1092} 1093 1094/* 1095 * A convenient macro that defines init_module() and cleanup_module(), 1096 * as necessary. 1097 */ 1098COMEDI_INITCLEANUP(driver_dmm32at); 1099