ni_daq_700.c revision eb14120f743d29744d9475bffec56ff4ad43a749
1/* 2 * comedi/drivers/ni_daq_700.c 3 * Driver for DAQCard-700 DIO only 4 * copied from 8255 5 * 6 * COMEDI - Linux Control and Measurement Device Interface 7 * Copyright (C) 1998 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: ni_daq_700 27Description: National Instruments PCMCIA DAQCard-700 DIO only 28Author: Fred Brooks <nsaspook@nsaspook.com>, 29 based on ni_daq_dio24 by Daniel Vecino Castel <dvecino@able.es> 30Devices: [National Instruments] PCMCIA DAQ-Card-700 (ni_daq_700) 31Status: works 32Updated: Thu, 21 Feb 2008 12:07:20 +0000 33 34The daqcard-700 appears in Comedi as a single digital I/O subdevice with 3516 channels. The channel 0 corresponds to the daqcard-700's output 36port, bit 0; channel 8 corresponds to the input port, bit 0. 37 38Direction configuration: channels 0-7 output, 8-15 input (8225 device 39emu as port A output, port B input, port C N/A). 40 41IRQ is assigned but not used. 42*/ 43 44#include <linux/interrupt.h> 45#include <linux/slab.h> 46#include "../comedidev.h" 47 48#include <linux/ioport.h> 49 50#include <pcmcia/cs_types.h> 51#include <pcmcia/cs.h> 52#include <pcmcia/cistpl.h> 53#include <pcmcia/cisreg.h> 54#include <pcmcia/ds.h> 55 56static struct pcmcia_device *pcmcia_cur_dev = NULL; 57 58#define DIO700_SIZE 8 /* size of io region used by board */ 59 60static int dio700_attach(struct comedi_device *dev, 61 struct comedi_devconfig *it); 62static int dio700_detach(struct comedi_device *dev); 63 64enum dio700_bustype { pcmcia_bustype }; 65 66struct dio700_board { 67 const char *name; 68 int device_id; /* device id for pcmcia board */ 69 enum dio700_bustype bustype; /* PCMCIA */ 70 int have_dio; /* have daqcard-700 dio */ 71 /* function pointers so we can use inb/outb or readb/writeb */ 72 /* as appropriate */ 73 unsigned int (*read_byte) (unsigned int address); 74 void (*write_byte) (unsigned int byte, unsigned int address); 75}; 76 77static const struct dio700_board dio700_boards[] = { 78 { 79 .name = "daqcard-700", 80 /* 0x10b is manufacturer id, 0x4743 is device id */ 81 .device_id = 0x4743, 82 .bustype = pcmcia_bustype, 83 .have_dio = 1, 84 }, 85 { 86 .name = "ni_daq_700", 87 /* 0x10b is manufacturer id, 0x4743 is device id */ 88 .device_id = 0x4743, 89 .bustype = pcmcia_bustype, 90 .have_dio = 1, 91 }, 92}; 93 94/* 95 * Useful for shorthand access to the particular board structure 96 */ 97#define thisboard ((const struct dio700_board *)dev->board_ptr) 98 99struct dio700_private { 100 101 int data; /* number of data points left to be taken */ 102}; 103 104#define devpriv ((struct dio700_private *)dev->private) 105 106static struct comedi_driver driver_dio700 = { 107 .driver_name = "ni_daq_700", 108 .module = THIS_MODULE, 109 .attach = dio700_attach, 110 .detach = dio700_detach, 111 .num_names = ARRAY_SIZE(dio700_boards), 112 .board_name = &dio700_boards[0].name, 113 .offset = sizeof(struct dio700_board), 114}; 115 116/* the real driver routines */ 117 118#define _700_SIZE 8 119 120#define _700_DATA 0 121 122#define DIO_W 0x04 123#define DIO_R 0x05 124 125struct subdev_700_struct { 126 unsigned long cb_arg; 127 int (*cb_func) (int, int, int, unsigned long); 128 int have_irq; 129}; 130 131#define CALLBACK_ARG (((struct subdev_700_struct *)s->private)->cb_arg) 132#define CALLBACK_FUNC (((struct subdev_700_struct *)s->private)->cb_func) 133#define subdevpriv ((struct subdev_700_struct *)s->private) 134 135static void do_config(struct comedi_device *dev, struct comedi_subdevice *s); 136 137void subdev_700_interrupt(struct comedi_device *dev, struct comedi_subdevice *s) 138{ 139 short d; 140 141 d = CALLBACK_FUNC(0, _700_DATA, 0, CALLBACK_ARG); 142 143 comedi_buf_put(s->async, d); 144 s->async->events |= COMEDI_CB_EOS; 145 146 comedi_event(dev, s); 147} 148 149static int subdev_700_cb(int dir, int port, int data, unsigned long arg) 150{ 151 /* port is always A for output and B for input (8255 emu) */ 152 unsigned long iobase = arg; 153 154 if (dir) { 155 outb(data, iobase + DIO_W); 156 return 0; 157 } else { 158 return inb(iobase + DIO_R); 159 } 160} 161 162static int subdev_700_insn(struct comedi_device *dev, 163 struct comedi_subdevice *s, struct comedi_insn *insn, 164 unsigned int *data) 165{ 166 if (data[0]) { 167 s->state &= ~data[0]; 168 s->state |= (data[0] & data[1]); 169 170 if (data[0] & 0xff) 171 CALLBACK_FUNC(1, _700_DATA, s->state & 0xff, 172 CALLBACK_ARG); 173 } 174 175 data[1] = s->state & 0xff; 176 data[1] |= CALLBACK_FUNC(0, _700_DATA, 0, CALLBACK_ARG) << 8; 177 178 return 2; 179} 180 181static int subdev_700_insn_config(struct comedi_device *dev, 182 struct comedi_subdevice *s, 183 struct comedi_insn *insn, unsigned int *data) 184{ 185 186 switch (data[0]) { 187 case INSN_CONFIG_DIO_INPUT: 188 break; 189 case INSN_CONFIG_DIO_OUTPUT: 190 break; 191 case INSN_CONFIG_DIO_QUERY: 192 data[1] = 193 (s-> 194 io_bits & (1 << CR_CHAN(insn->chanspec))) ? COMEDI_OUTPUT : 195 COMEDI_INPUT; 196 return insn->n; 197 break; 198 default: 199 return -EINVAL; 200 } 201 202 return 1; 203} 204 205static void do_config(struct comedi_device *dev, struct comedi_subdevice *s) 206{ /* use powerup defaults */ 207 return; 208} 209 210static int subdev_700_cmdtest(struct comedi_device *dev, 211 struct comedi_subdevice *s, 212 struct comedi_cmd *cmd) 213{ 214 int err = 0; 215 unsigned int tmp; 216 217 /* step 1 */ 218 219 tmp = cmd->start_src; 220 cmd->start_src &= TRIG_NOW; 221 if (!cmd->start_src || tmp != cmd->start_src) 222 err++; 223 224 tmp = cmd->scan_begin_src; 225 cmd->scan_begin_src &= TRIG_EXT; 226 if (!cmd->scan_begin_src || tmp != cmd->scan_begin_src) 227 err++; 228 229 tmp = cmd->convert_src; 230 cmd->convert_src &= TRIG_FOLLOW; 231 if (!cmd->convert_src || tmp != cmd->convert_src) 232 err++; 233 234 tmp = cmd->scan_end_src; 235 cmd->scan_end_src &= TRIG_COUNT; 236 if (!cmd->scan_end_src || tmp != cmd->scan_end_src) 237 err++; 238 239 tmp = cmd->stop_src; 240 cmd->stop_src &= TRIG_NONE; 241 if (!cmd->stop_src || tmp != cmd->stop_src) 242 err++; 243 244 if (err) 245 return 1; 246 247 /* step 2 */ 248 249 if (err) 250 return 2; 251 252 /* step 3 */ 253 254 if (cmd->start_arg != 0) { 255 cmd->start_arg = 0; 256 err++; 257 } 258 if (cmd->scan_begin_arg != 0) { 259 cmd->scan_begin_arg = 0; 260 err++; 261 } 262 if (cmd->convert_arg != 0) { 263 cmd->convert_arg = 0; 264 err++; 265 } 266 if (cmd->scan_end_arg != 1) { 267 cmd->scan_end_arg = 1; 268 err++; 269 } 270 if (cmd->stop_arg != 0) { 271 cmd->stop_arg = 0; 272 err++; 273 } 274 275 if (err) 276 return 3; 277 278 /* step 4 */ 279 280 if (err) 281 return 4; 282 283 return 0; 284} 285 286static int subdev_700_cmd(struct comedi_device *dev, struct comedi_subdevice *s) 287{ 288 /* FIXME */ 289 290 return 0; 291} 292 293static int subdev_700_cancel(struct comedi_device *dev, 294 struct comedi_subdevice *s) 295{ 296 /* FIXME */ 297 298 return 0; 299} 300 301int subdev_700_init(struct comedi_device *dev, struct comedi_subdevice *s, 302 int (*cb) (int, int, int, unsigned long), unsigned long arg) 303{ 304 s->type = COMEDI_SUBD_DIO; 305 s->subdev_flags = SDF_READABLE | SDF_WRITABLE; 306 s->n_chan = 16; 307 s->range_table = &range_digital; 308 s->maxdata = 1; 309 310 s->private = kmalloc(sizeof(struct subdev_700_struct), GFP_KERNEL); 311 if (!s->private) 312 return -ENOMEM; 313 314 CALLBACK_ARG = arg; 315 if (cb == NULL) 316 CALLBACK_FUNC = subdev_700_cb; 317 else 318 CALLBACK_FUNC = cb; 319 320 s->insn_bits = subdev_700_insn; 321 s->insn_config = subdev_700_insn_config; 322 323 s->state = 0; 324 s->io_bits = 0x00ff; 325 do_config(dev, s); 326 327 return 0; 328} 329 330int subdev_700_init_irq(struct comedi_device *dev, struct comedi_subdevice *s, 331 int (*cb) (int, int, int, unsigned long), 332 unsigned long arg) 333{ 334 int ret; 335 336 ret = subdev_700_init(dev, s, cb, arg); 337 if (ret < 0) 338 return ret; 339 340 s->do_cmdtest = subdev_700_cmdtest; 341 s->do_cmd = subdev_700_cmd; 342 s->cancel = subdev_700_cancel; 343 344 subdevpriv->have_irq = 1; 345 346 return 0; 347} 348 349void subdev_700_cleanup(struct comedi_device *dev, struct comedi_subdevice *s) 350{ 351 if (s->private) 352 if (subdevpriv->have_irq) 353 354 kfree(s->private); 355} 356 357EXPORT_SYMBOL(subdev_700_init); 358EXPORT_SYMBOL(subdev_700_init_irq); 359EXPORT_SYMBOL(subdev_700_cleanup); 360EXPORT_SYMBOL(subdev_700_interrupt); 361 362static int dio700_attach(struct comedi_device *dev, struct comedi_devconfig *it) 363{ 364 struct comedi_subdevice *s; 365 unsigned long iobase = 0; 366#ifdef incomplete 367 unsigned int irq = 0; 368#endif 369 struct pcmcia_device *link; 370 371 /* allocate and initialize dev->private */ 372 if (alloc_private(dev, sizeof(struct dio700_private)) < 0) 373 return -ENOMEM; 374 375 /* get base address, irq etc. based on bustype */ 376 switch (thisboard->bustype) { 377 case pcmcia_bustype: 378 link = pcmcia_cur_dev; /* XXX hack */ 379 if (!link) 380 return -EIO; 381 iobase = link->io.BasePort1; 382#ifdef incomplete 383 irq = link->irq; 384#endif 385 break; 386 default: 387 printk("bug! couldn't determine board type\n"); 388 return -EINVAL; 389 break; 390 } 391 printk("comedi%d: ni_daq_700: %s, io 0x%lx", dev->minor, 392 thisboard->name, iobase); 393#ifdef incomplete 394 if (irq) 395 printk(", irq %u", irq); 396 397#endif 398 399 printk("\n"); 400 401 if (iobase == 0) { 402 printk("io base address is zero!\n"); 403 return -EINVAL; 404 } 405 406 dev->iobase = iobase; 407 408#ifdef incomplete 409 /* grab our IRQ */ 410 dev->irq = irq; 411#endif 412 413 dev->board_name = thisboard->name; 414 415 if (alloc_subdevices(dev, 1) < 0) 416 return -ENOMEM; 417 418 /* DAQCard-700 dio */ 419 s = dev->subdevices + 0; 420 subdev_700_init(dev, s, NULL, dev->iobase); 421 422 return 0; 423}; 424 425static int dio700_detach(struct comedi_device *dev) 426{ 427 printk("comedi%d: ni_daq_700: cs-remove\n", dev->minor); 428 429 if (dev->subdevices) 430 subdev_700_cleanup(dev, dev->subdevices + 0); 431 432 if (thisboard->bustype != pcmcia_bustype && dev->iobase) 433 release_region(dev->iobase, DIO700_SIZE); 434 if (dev->irq) 435 free_irq(dev->irq, dev); 436 437 return 0; 438}; 439 440/* PCMCIA crap -- watch your words, please! */ 441 442static void dio700_config(struct pcmcia_device *link); 443static void dio700_release(struct pcmcia_device *link); 444static int dio700_cs_suspend(struct pcmcia_device *p_dev); 445static int dio700_cs_resume(struct pcmcia_device *p_dev); 446 447/* 448 The attach() and detach() entry points are used to create and destroy 449 "instances" of the driver, where each instance represents everything 450 needed to manage one actual PCMCIA card. 451*/ 452 453static int dio700_cs_attach(struct pcmcia_device *); 454static void dio700_cs_detach(struct pcmcia_device *); 455 456/* 457 You'll also need to prototype all the functions that will actually 458 be used to talk to your device. See 'memory_cs' for a good example 459 of a fully self-sufficient driver; the other drivers rely more or 460 less on other parts of the kernel. 461*/ 462 463/* 464 The dev_info variable is the "key" that is used to match up this 465 device driver with appropriate cards, through the card configuration 466 database. 467*/ 468 469static const dev_info_t dev_info = "ni_daq_700"; 470 471struct local_info_t { 472 struct pcmcia_device *link; 473 dev_node_t node; 474 int stop; 475 struct bus_operations *bus; 476}; 477 478/*====================================================================== 479 480 dio700_cs_attach() creates an "instance" of the driver, allocating 481 local data structures for one device. The device is registered 482 with Card Services. 483 484 The dev_link structure is initialized, but we don't actually 485 configure the card at this point -- we wait until we receive a 486 card insertion event. 487 488======================================================================*/ 489 490static int dio700_cs_attach(struct pcmcia_device *link) 491{ 492 struct local_info_t *local; 493 494 printk(KERN_INFO "ni_daq_700: cs-attach\n"); 495 496 dev_dbg(&link->dev, "dio700_cs_attach()\n"); 497 498 /* Allocate space for private device-specific data */ 499 local = kzalloc(sizeof(struct local_info_t), GFP_KERNEL); 500 if (!local) 501 return -ENOMEM; 502 local->link = link; 503 link->priv = local; 504 505 /* 506 General socket configuration defaults can go here. In this 507 client, we assume very little, and rely on the CIS for almost 508 everything. In most clients, many details (i.e., number, sizes, 509 and attributes of IO windows) are fixed by the nature of the 510 device, and can be hard-wired here. 511 */ 512 link->conf.Attributes = 0; 513 link->conf.IntType = INT_MEMORY_AND_IO; 514 515 pcmcia_cur_dev = link; 516 517 dio700_config(link); 518 519 return 0; 520} /* dio700_cs_attach */ 521 522/*====================================================================== 523 524 This deletes a driver "instance". The device is de-registered 525 with Card Services. If it has been released, all local data 526 structures are freed. Otherwise, the structures will be freed 527 when the device is released. 528 529======================================================================*/ 530 531static void dio700_cs_detach(struct pcmcia_device *link) 532{ 533 534 printk(KERN_INFO "ni_daq_700: cs-detach!\n"); 535 536 dev_dbg(&link->dev, "dio700_cs_detach\n"); 537 538 if (link->dev_node) { 539 ((struct local_info_t *)link->priv)->stop = 1; 540 dio700_release(link); 541 } 542 543 /* This points to the parent struct local_info_t struct */ 544 if (link->priv) 545 kfree(link->priv); 546 547} /* dio700_cs_detach */ 548 549/*====================================================================== 550 551 dio700_config() is scheduled to run after a CARD_INSERTION event 552 is received, to configure the PCMCIA socket, and to make the 553 device available to the system. 554 555======================================================================*/ 556 557static int dio700_pcmcia_config_loop(struct pcmcia_device *p_dev, 558 cistpl_cftable_entry_t *cfg, 559 cistpl_cftable_entry_t *dflt, 560 unsigned int vcc, 561 void *priv_data) 562{ 563 win_req_t *req = priv_data; 564 memreq_t map; 565 566 if (cfg->index == 0) 567 return -ENODEV; 568 569 /* Does this card need audio output? */ 570 if (cfg->flags & CISTPL_CFTABLE_AUDIO) { 571 p_dev->conf.Attributes |= CONF_ENABLE_SPKR; 572 p_dev->conf.Status = CCSR_AUDIO_ENA; 573 } 574 575 /* Do we need to allocate an interrupt? */ 576 p_dev->conf.Attributes |= CONF_ENABLE_IRQ; 577 578 /* IO window settings */ 579 p_dev->io.NumPorts1 = p_dev->io.NumPorts2 = 0; 580 if ((cfg->io.nwin > 0) || (dflt->io.nwin > 0)) { 581 cistpl_io_t *io = (cfg->io.nwin) ? &cfg->io : &dflt->io; 582 p_dev->io.Attributes1 = IO_DATA_PATH_WIDTH_AUTO; 583 if (!(io->flags & CISTPL_IO_8BIT)) 584 p_dev->io.Attributes1 = IO_DATA_PATH_WIDTH_16; 585 if (!(io->flags & CISTPL_IO_16BIT)) 586 p_dev->io.Attributes1 = IO_DATA_PATH_WIDTH_8; 587 p_dev->io.IOAddrLines = io->flags & CISTPL_IO_LINES_MASK; 588 p_dev->io.BasePort1 = io->win[0].base; 589 p_dev->io.NumPorts1 = io->win[0].len; 590 if (io->nwin > 1) { 591 p_dev->io.Attributes2 = p_dev->io.Attributes1; 592 p_dev->io.BasePort2 = io->win[1].base; 593 p_dev->io.NumPorts2 = io->win[1].len; 594 } 595 /* This reserves IO space but doesn't actually enable it */ 596 if (pcmcia_request_io(p_dev, &p_dev->io) != 0) 597 return -ENODEV; 598 } 599 600 if ((cfg->mem.nwin > 0) || (dflt->mem.nwin > 0)) { 601 cistpl_mem_t *mem = 602 (cfg->mem.nwin) ? &cfg->mem : &dflt->mem; 603 req->Attributes = WIN_DATA_WIDTH_16 | WIN_MEMORY_TYPE_CM; 604 req->Attributes |= WIN_ENABLE; 605 req->Base = mem->win[0].host_addr; 606 req->Size = mem->win[0].len; 607 if (req->Size < 0x1000) 608 req->Size = 0x1000; 609 req->AccessSpeed = 0; 610 if (pcmcia_request_window(p_dev, req, &p_dev->win)) 611 return -ENODEV; 612 map.Page = 0; 613 map.CardOffset = mem->win[0].card_addr; 614 if (pcmcia_map_mem_page(p_dev, p_dev->win, &map)) 615 return -ENODEV; 616 } 617 /* If we got this far, we're cool! */ 618 return 0; 619} 620 621static void dio700_config(struct pcmcia_device *link) 622{ 623 struct local_info_t *dev = link->priv; 624 win_req_t req; 625 int ret; 626 627 printk(KERN_INFO "ni_daq_700: cs-config\n"); 628 629 dev_dbg(&link->dev, "dio700_config\n"); 630 631 ret = pcmcia_loop_config(link, dio700_pcmcia_config_loop, &req); 632 if (ret) { 633 dev_warn(&link->dev, "no configuration found\n"); 634 goto failed; 635 } 636 637 if (!link->irq) 638 goto failed; 639 640 /* 641 This actually configures the PCMCIA socket -- setting up 642 the I/O windows and the interrupt mapping, and putting the 643 card and host interface into "Memory and IO" mode. 644 */ 645 ret = pcmcia_request_configuration(link, &link->conf); 646 if (ret != 0) 647 goto failed; 648 649 /* 650 At this point, the dev_node_t structure(s) need to be 651 initialized and arranged in a linked list at link->dev. 652 */ 653 sprintf(dev->node.dev_name, "ni_daq_700"); 654 dev->node.major = dev->node.minor = 0; 655 link->dev_node = &dev->node; 656 657 /* Finally, report what we've done */ 658 printk(KERN_INFO "%s: index 0x%02x", 659 dev->node.dev_name, link->conf.ConfigIndex); 660 if (link->conf.Attributes & CONF_ENABLE_IRQ) 661 printk(", irq %d", link->irq); 662 if (link->io.NumPorts1) 663 printk(", io 0x%04x-0x%04x", link->io.BasePort1, 664 link->io.BasePort1 + link->io.NumPorts1 - 1); 665 if (link->io.NumPorts2) 666 printk(" & 0x%04x-0x%04x", link->io.BasePort2, 667 link->io.BasePort2 + link->io.NumPorts2 - 1); 668 if (link->win) 669 printk(", mem 0x%06lx-0x%06lx", req.Base, 670 req.Base + req.Size - 1); 671 printk("\n"); 672 673 return; 674 675failed: 676 printk(KERN_INFO "ni_daq_700 cs failed"); 677 dio700_release(link); 678 679} /* dio700_config */ 680 681static void dio700_release(struct pcmcia_device *link) 682{ 683 dev_dbg(&link->dev, "dio700_release\n"); 684 685 pcmcia_disable_device(link); 686} /* dio700_release */ 687 688/*====================================================================== 689 690 The card status event handler. Mostly, this schedules other 691 stuff to run after an event is received. 692 693 When a CARD_REMOVAL event is received, we immediately set a 694 private flag to block future accesses to this device. All the 695 functions that actually access the device should check this flag 696 to make sure the card is still present. 697 698======================================================================*/ 699 700static int dio700_cs_suspend(struct pcmcia_device *link) 701{ 702 struct local_info_t *local = link->priv; 703 704 /* Mark the device as stopped, to block IO until later */ 705 local->stop = 1; 706 return 0; 707} /* dio700_cs_suspend */ 708 709static int dio700_cs_resume(struct pcmcia_device *link) 710{ 711 struct local_info_t *local = link->priv; 712 713 local->stop = 0; 714 return 0; 715} /* dio700_cs_resume */ 716 717/*====================================================================*/ 718 719static struct pcmcia_device_id dio700_cs_ids[] = { 720 /* N.B. These IDs should match those in dio700_boards */ 721 PCMCIA_DEVICE_MANF_CARD(0x010b, 0x4743), /* daqcard-700 */ 722 PCMCIA_DEVICE_NULL 723}; 724 725MODULE_LICENSE("GPL"); 726MODULE_DEVICE_TABLE(pcmcia, dio700_cs_ids); 727 728struct pcmcia_driver dio700_cs_driver = { 729 .probe = dio700_cs_attach, 730 .remove = dio700_cs_detach, 731 .suspend = dio700_cs_suspend, 732 .resume = dio700_cs_resume, 733 .id_table = dio700_cs_ids, 734 .owner = THIS_MODULE, 735 .drv = { 736 .name = dev_info, 737 }, 738}; 739 740static int __init init_dio700_cs(void) 741{ 742 pcmcia_register_driver(&dio700_cs_driver); 743 return 0; 744} 745 746static void __exit exit_dio700_cs(void) 747{ 748 pr_debug("ni_daq_700: unloading\n"); 749 pcmcia_unregister_driver(&dio700_cs_driver); 750} 751 752int __init init_module(void) 753{ 754 int ret; 755 756 ret = init_dio700_cs(); 757 if (ret < 0) 758 return ret; 759 760 return comedi_driver_register(&driver_dio700); 761} 762 763void __exit cleanup_module(void) 764{ 765 exit_dio700_cs(); 766 comedi_driver_unregister(&driver_dio700); 767} 768