serial2002.c revision e9d1cf89ed5561adc1d36aea6d1349d12dfedd74
1/* 2 comedi/drivers/serial2002.c 3 Skeleton code for a Comedi driver 4 5 COMEDI - Linux Control and Measurement Device Interface 6 Copyright (C) 2002 Anders Blomdell <anders.blomdell@control.lth.se> 7 8 This program is free software; you can redistribute it and/or modify 9 it under the terms of the GNU General Public License as published by 10 the Free Software Foundation; either version 2 of the License, or 11 (at your option) any later version. 12 13 This program is distributed in the hope that it will be useful, 14 but WITHOUT ANY WARRANTY; without even the implied warranty of 15 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 16 GNU General Public License for more details. 17 18 You should have received a copy of the GNU General Public License 19 along with this program; if not, write to the Free Software 20 Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. 21 22*/ 23 24/* 25Driver: serial2002 26Description: Driver for serial connected hardware 27Devices: 28Author: Anders Blomdell 29Updated: Fri, 7 Jun 2002 12:56:45 -0700 30Status: in development 31 32*/ 33 34#include "../comedidev.h" 35 36#include <linux/delay.h> 37#include <linux/ioport.h> 38#include <linux/sched.h> 39#include <linux/slab.h> 40 41#include <linux/termios.h> 42#include <asm/ioctls.h> 43#include <linux/serial.h> 44#include <linux/poll.h> 45 46/* 47 * Board descriptions for two imaginary boards. Describing the 48 * boards in this way is optional, and completely driver-dependent. 49 * Some drivers use arrays such as this, other do not. 50 */ 51struct serial2002_board { 52 const char *name; 53}; 54 55static const struct serial2002_board serial2002_boards[] = { 56 { 57 .name = "serial2002"} 58}; 59 60/* 61 * Useful for shorthand access to the particular board structure 62 */ 63#define thisboard ((const struct serial2002_board *)dev->board_ptr) 64 65struct serial2002_range_table_t { 66 67 /* HACK... */ 68 int length; 69 struct comedi_krange range; 70}; 71 72struct serial2002_private { 73 74 int port; /* /dev/ttyS<port> */ 75 int speed; /* baudrate */ 76 struct file *tty; 77 unsigned int ao_readback[32]; 78 unsigned char digital_in_mapping[32]; 79 unsigned char digital_out_mapping[32]; 80 unsigned char analog_in_mapping[32]; 81 unsigned char analog_out_mapping[32]; 82 unsigned char encoder_in_mapping[32]; 83 struct serial2002_range_table_t in_range[32], out_range[32]; 84}; 85 86/* 87 * most drivers define the following macro to make it easy to 88 * access the private structure. 89 */ 90#define devpriv ((struct serial2002_private *)dev->private) 91 92static int serial2002_attach(struct comedi_device *dev, 93 struct comedi_devconfig *it); 94static int serial2002_detach(struct comedi_device *dev); 95struct comedi_driver driver_serial2002 = { 96 .driver_name = "serial2002", 97 .module = THIS_MODULE, 98 .attach = serial2002_attach, 99 .detach = serial2002_detach, 100 .board_name = &serial2002_boards[0].name, 101 .offset = sizeof(struct serial2002_board), 102 .num_names = ARRAY_SIZE(serial2002_boards), 103}; 104 105static int serial2002_di_rinsn(struct comedi_device *dev, 106 struct comedi_subdevice *s, 107 struct comedi_insn *insn, unsigned int *data); 108static int serial2002_do_winsn(struct comedi_device *dev, 109 struct comedi_subdevice *s, 110 struct comedi_insn *insn, unsigned int *data); 111static int serial2002_ai_rinsn(struct comedi_device *dev, 112 struct comedi_subdevice *s, 113 struct comedi_insn *insn, unsigned int *data); 114static int serial2002_ao_winsn(struct comedi_device *dev, 115 struct comedi_subdevice *s, 116 struct comedi_insn *insn, unsigned int *data); 117static int serial2002_ao_rinsn(struct comedi_device *dev, 118 struct comedi_subdevice *s, 119 struct comedi_insn *insn, unsigned int *data); 120 121struct serial_data { 122 enum { is_invalid, is_digital, is_channel } kind; 123 int index; 124 unsigned long value; 125}; 126 127static long tty_ioctl(struct file *f, unsigned op, unsigned long param) 128{ 129 if (f->f_op->unlocked_ioctl) 130 return f->f_op->unlocked_ioctl(f, op, param); 131 132 return -ENOSYS; 133} 134 135static int tty_write(struct file *f, unsigned char *buf, int count) 136{ 137 int result; 138 mm_segment_t oldfs; 139 140 oldfs = get_fs(); 141 set_fs(KERNEL_DS); 142 f->f_pos = 0; 143 result = f->f_op->write(f, buf, count, &f->f_pos); 144 set_fs(oldfs); 145 return result; 146} 147 148#if 0 149/* 150 * On 2.6.26.3 this occaisonally gave me page faults, worked around by 151 * settings.c_cc[VMIN] = 0; settings.c_cc[VTIME] = 0 152 */ 153static int tty_available(struct file *f) 154{ 155 long result = 0; 156 mm_segment_t oldfs; 157 158 oldfs = get_fs(); 159 set_fs(KERNEL_DS); 160 tty_ioctl(f, FIONREAD, (unsigned long)&result); 161 set_fs(oldfs); 162 return result; 163} 164#endif 165 166static int tty_read(struct file *f, int timeout) 167{ 168 int result; 169 170 result = -1; 171 if (!IS_ERR(f)) { 172 mm_segment_t oldfs; 173 174 oldfs = get_fs(); 175 set_fs(KERNEL_DS); 176 if (f->f_op->poll) { 177 struct poll_wqueues table; 178 struct timeval start, now; 179 180 do_gettimeofday(&start); 181 poll_initwait(&table); 182 while (1) { 183 long elapsed; 184 int mask; 185 186 mask = f->f_op->poll(f, &table.pt); 187 if (mask & (POLLRDNORM | POLLRDBAND | POLLIN | 188 POLLHUP | POLLERR)) { 189 break; 190 } 191 do_gettimeofday(&now); 192 elapsed = 193 (1000000 * (now.tv_sec - start.tv_sec) + 194 now.tv_usec - start.tv_usec); 195 if (elapsed > timeout) 196 break; 197 set_current_state(TASK_INTERRUPTIBLE); 198 schedule_timeout(((timeout - 199 elapsed) * HZ) / 10000); 200 } 201 poll_freewait(&table); 202 { 203 unsigned char ch; 204 205 f->f_pos = 0; 206 if (f->f_op->read(f, &ch, 1, &f->f_pos) == 1) 207 result = ch; 208 } 209 } else { 210 /* Device does not support poll, busy wait */ 211 int retries = 0; 212 while (1) { 213 unsigned char ch; 214 215 retries++; 216 if (retries >= timeout) 217 break; 218 219 f->f_pos = 0; 220 if (f->f_op->read(f, &ch, 1, &f->f_pos) == 1) { 221 result = ch; 222 break; 223 } 224 udelay(100); 225 } 226 } 227 set_fs(oldfs); 228 } 229 return result; 230} 231 232static void tty_setspeed(struct file *f, int speed) 233{ 234 mm_segment_t oldfs; 235 236 oldfs = get_fs(); 237 set_fs(KERNEL_DS); 238 { 239 /* Set speed */ 240 struct termios settings; 241 242 tty_ioctl(f, TCGETS, (unsigned long)&settings); 243/* printk("Speed: %d\n", settings.c_cflag & (CBAUD | CBAUDEX)); */ 244 settings.c_iflag = 0; 245 settings.c_oflag = 0; 246 settings.c_lflag = 0; 247 settings.c_cflag = CLOCAL | CS8 | CREAD; 248 settings.c_cc[VMIN] = 0; 249 settings.c_cc[VTIME] = 0; 250 switch (speed) { 251 case 2400:{ 252 settings.c_cflag |= B2400; 253 } 254 break; 255 case 4800:{ 256 settings.c_cflag |= B4800; 257 } 258 break; 259 case 9600:{ 260 settings.c_cflag |= B9600; 261 } 262 break; 263 case 19200:{ 264 settings.c_cflag |= B19200; 265 } 266 break; 267 case 38400:{ 268 settings.c_cflag |= B38400; 269 } 270 break; 271 case 57600:{ 272 settings.c_cflag |= B57600; 273 } 274 break; 275 case 115200:{ 276 settings.c_cflag |= B115200; 277 } 278 break; 279 default:{ 280 settings.c_cflag |= B9600; 281 } 282 break; 283 } 284 tty_ioctl(f, TCSETS, (unsigned long)&settings); 285/* printk("Speed: %d\n", settings.c_cflag & (CBAUD | CBAUDEX)); */ 286 } 287 { 288 /* Set low latency */ 289 struct serial_struct settings; 290 291 tty_ioctl(f, TIOCGSERIAL, (unsigned long)&settings); 292 settings.flags |= ASYNC_LOW_LATENCY; 293 tty_ioctl(f, TIOCSSERIAL, (unsigned long)&settings); 294 } 295 296 set_fs(oldfs); 297} 298 299static void poll_digital(struct file *f, int channel) 300{ 301 char cmd; 302 303 cmd = 0x40 | (channel & 0x1f); 304 tty_write(f, &cmd, 1); 305} 306 307static void poll_channel(struct file *f, int channel) 308{ 309 char cmd; 310 311 cmd = 0x60 | (channel & 0x1f); 312 tty_write(f, &cmd, 1); 313} 314 315static struct serial_data serial_read(struct file *f, int timeout) 316{ 317 struct serial_data result; 318 int length; 319 320 result.kind = is_invalid; 321 result.index = 0; 322 result.value = 0; 323 length = 0; 324 while (1) { 325 int data = tty_read(f, timeout); 326 327 length++; 328 if (data < 0) { 329 printk(KERN_ERR "serial2002 error\n"); 330 break; 331 } else if (data & 0x80) { 332 result.value = (result.value << 7) | (data & 0x7f); 333 } else { 334 if (length == 1) { 335 switch ((data >> 5) & 0x03) { 336 case 0:{ 337 result.value = 0; 338 result.kind = is_digital; 339 } 340 break; 341 case 1:{ 342 result.value = 1; 343 result.kind = is_digital; 344 } 345 break; 346 } 347 } else { 348 result.value = 349 (result.value << 2) | ((data & 0x60) >> 5); 350 result.kind = is_channel; 351 } 352 result.index = data & 0x1f; 353 break; 354 } 355 } 356 return result; 357 358} 359 360static void serial_write(struct file *f, struct serial_data data) 361{ 362 if (data.kind == is_digital) { 363 unsigned char ch = 364 ((data.value << 5) & 0x20) | (data.index & 0x1f); 365 tty_write(f, &ch, 1); 366 } else { 367 unsigned char ch[6]; 368 int i = 0; 369 if (data.value >= (1L << 30)) { 370 ch[i] = 0x80 | ((data.value >> 30) & 0x03); 371 i++; 372 } 373 if (data.value >= (1L << 23)) { 374 ch[i] = 0x80 | ((data.value >> 23) & 0x7f); 375 i++; 376 } 377 if (data.value >= (1L << 16)) { 378 ch[i] = 0x80 | ((data.value >> 16) & 0x7f); 379 i++; 380 } 381 if (data.value >= (1L << 9)) { 382 ch[i] = 0x80 | ((data.value >> 9) & 0x7f); 383 i++; 384 } 385 ch[i] = 0x80 | ((data.value >> 2) & 0x7f); 386 i++; 387 ch[i] = ((data.value << 5) & 0x60) | (data.index & 0x1f); 388 i++; 389 tty_write(f, ch, i); 390 } 391} 392 393static int serial_2002_open(struct comedi_device *dev) 394{ 395 int result; 396 char port[20]; 397 398 sprintf(port, "/dev/ttyS%d", devpriv->port); 399 devpriv->tty = filp_open(port, O_RDWR, 0); 400 if (IS_ERR(devpriv->tty)) { 401 result = (int)PTR_ERR(devpriv->tty); 402 printk(KERN_ERR "serial_2002: file open error = %d\n", result); 403 } else { 404 struct config_t { 405 406 short int kind; 407 short int bits; 408 int min; 409 int max; 410 }; 411 412 struct config_t *dig_in_config; 413 struct config_t *dig_out_config; 414 struct config_t *chan_in_config; 415 struct config_t *chan_out_config; 416 int i; 417 418 result = 0; 419 dig_in_config = kcalloc(32, sizeof(struct config_t), 420 GFP_KERNEL); 421 dig_out_config = kcalloc(32, sizeof(struct config_t), 422 GFP_KERNEL); 423 chan_in_config = kcalloc(32, sizeof(struct config_t), 424 GFP_KERNEL); 425 chan_out_config = kcalloc(32, sizeof(struct config_t), 426 GFP_KERNEL); 427 if (!dig_in_config || !dig_out_config 428 || !chan_in_config || !chan_out_config) { 429 result = -ENOMEM; 430 goto err_alloc_configs; 431 } 432 433 tty_setspeed(devpriv->tty, devpriv->speed); 434 poll_channel(devpriv->tty, 31); /* Start reading configuration */ 435 while (1) { 436 struct serial_data data; 437 438 data = serial_read(devpriv->tty, 1000); 439 if (data.kind != is_channel || data.index != 31 440 || !(data.value & 0xe0)) { 441 break; 442 } else { 443 int command, channel, kind; 444 struct config_t *cur_config = NULL; 445 446 channel = data.value & 0x1f; 447 kind = (data.value >> 5) & 0x7; 448 command = (data.value >> 8) & 0x3; 449 switch (kind) { 450 case 1:{ 451 cur_config = dig_in_config; 452 } 453 break; 454 case 2:{ 455 cur_config = dig_out_config; 456 } 457 break; 458 case 3:{ 459 cur_config = chan_in_config; 460 } 461 break; 462 case 4:{ 463 cur_config = chan_out_config; 464 } 465 break; 466 case 5:{ 467 cur_config = chan_in_config; 468 } 469 break; 470 } 471 472 if (cur_config) { 473 cur_config[channel].kind = kind; 474 switch (command) { 475 case 0:{ 476 cur_config[channel].bits 477 = 478 (data.value >> 10) & 479 0x3f; 480 } 481 break; 482 case 1:{ 483 int unit, sign, min; 484 unit = 485 (data.value >> 10) & 486 0x7; 487 sign = 488 (data.value >> 13) & 489 0x1; 490 min = 491 (data.value >> 14) & 492 0xfffff; 493 494 switch (unit) { 495 case 0:{ 496 min = 497 min 498 * 499 1000000; 500 } 501 break; 502 case 1:{ 503 min = 504 min 505 * 506 1000; 507 } 508 break; 509 case 2:{ 510 min = 511 min 512 * 1; 513 } 514 break; 515 } 516 if (sign) 517 min = -min; 518 cur_config[channel].min 519 = min; 520 } 521 break; 522 case 2:{ 523 int unit, sign, max; 524 unit = 525 (data.value >> 10) & 526 0x7; 527 sign = 528 (data.value >> 13) & 529 0x1; 530 max = 531 (data.value >> 14) & 532 0xfffff; 533 534 switch (unit) { 535 case 0:{ 536 max = 537 max 538 * 539 1000000; 540 } 541 break; 542 case 1:{ 543 max = 544 max 545 * 546 1000; 547 } 548 break; 549 case 2:{ 550 max = 551 max 552 * 1; 553 } 554 break; 555 } 556 if (sign) 557 max = -max; 558 cur_config[channel].max 559 = max; 560 } 561 break; 562 } 563 } 564 } 565 } 566 for (i = 0; i <= 4; i++) { 567 /* Fill in subdev data */ 568 struct config_t *c; 569 unsigned char *mapping = NULL; 570 struct serial2002_range_table_t *range = NULL; 571 int kind = 0; 572 573 switch (i) { 574 case 0:{ 575 c = dig_in_config; 576 mapping = devpriv->digital_in_mapping; 577 kind = 1; 578 } 579 break; 580 case 1:{ 581 c = dig_out_config; 582 mapping = devpriv->digital_out_mapping; 583 kind = 2; 584 } 585 break; 586 case 2:{ 587 c = chan_in_config; 588 mapping = devpriv->analog_in_mapping; 589 range = devpriv->in_range; 590 kind = 3; 591 } 592 break; 593 case 3:{ 594 c = chan_out_config; 595 mapping = devpriv->analog_out_mapping; 596 range = devpriv->out_range; 597 kind = 4; 598 } 599 break; 600 case 4:{ 601 c = chan_in_config; 602 mapping = devpriv->encoder_in_mapping; 603 range = devpriv->in_range; 604 kind = 5; 605 } 606 break; 607 default:{ 608 c = NULL; 609 } 610 break; 611 } 612 if (c) { 613 struct comedi_subdevice *s; 614 const struct comedi_lrange **range_table_list = 615 NULL; 616 unsigned int *maxdata_list; 617 int j, chan; 618 619 for (chan = 0, j = 0; j < 32; j++) { 620 if (c[j].kind == kind) 621 chan++; 622 } 623 s = &dev->subdevices[i]; 624 s->n_chan = chan; 625 s->maxdata = 0; 626 kfree(s->maxdata_list); 627 s->maxdata_list = maxdata_list = 628 kmalloc(sizeof(unsigned int) * s->n_chan, 629 GFP_KERNEL); 630 if (!s->maxdata_list) 631 break; /* error handled below */ 632 kfree(s->range_table_list); 633 s->range_table = NULL; 634 s->range_table_list = NULL; 635 if (range) { 636 s->range_table_list = range_table_list = 637 kmalloc(sizeof 638 (struct 639 serial2002_range_table_t) * 640 s->n_chan, GFP_KERNEL); 641 if (!s->range_table_list) 642 break; /* err handled below */ 643 } 644 for (chan = 0, j = 0; j < 32; j++) { 645 if (c[j].kind == kind) { 646 if (mapping) 647 mapping[chan] = j; 648 if (range) { 649 range[j].length = 1; 650 range[j].range.min = 651 c[j].min; 652 range[j].range.max = 653 c[j].max; 654 range_table_list[chan] = 655 (const struct 656 comedi_lrange *) 657 &range[j]; 658 } 659 maxdata_list[chan] = 660 ((long long)1 << c[j].bits) 661 - 1; 662 chan++; 663 } 664 } 665 } 666 } 667 if (i <= 4) { 668 /* Failed to allocate maxdata_list or range_table_list 669 * for a subdevice that needed it. */ 670 result = -ENOMEM; 671 for (i = 0; i <= 4; i++) { 672 struct comedi_subdevice *s; 673 674 s = &dev->subdevices[i]; 675 kfree(s->maxdata_list); 676 s->maxdata_list = NULL; 677 kfree(s->range_table_list); 678 s->range_table_list = NULL; 679 } 680 } 681 682err_alloc_configs: 683 kfree(dig_in_config); 684 kfree(dig_out_config); 685 kfree(chan_in_config); 686 kfree(chan_out_config); 687 688 if (result) { 689 if (devpriv->tty) { 690 filp_close(devpriv->tty, 0); 691 devpriv->tty = NULL; 692 } 693 } 694 } 695 return result; 696} 697 698static void serial_2002_close(struct comedi_device *dev) 699{ 700 if (!IS_ERR(devpriv->tty) && (devpriv->tty != 0)) 701 filp_close(devpriv->tty, 0); 702} 703 704static int serial2002_di_rinsn(struct comedi_device *dev, 705 struct comedi_subdevice *s, 706 struct comedi_insn *insn, unsigned int *data) 707{ 708 int n; 709 int chan; 710 711 chan = devpriv->digital_in_mapping[CR_CHAN(insn->chanspec)]; 712 for (n = 0; n < insn->n; n++) { 713 struct serial_data read; 714 715 poll_digital(devpriv->tty, chan); 716 while (1) { 717 read = serial_read(devpriv->tty, 1000); 718 if (read.kind != is_digital || read.index == chan) 719 break; 720 } 721 data[n] = read.value; 722 } 723 return n; 724} 725 726static int serial2002_do_winsn(struct comedi_device *dev, 727 struct comedi_subdevice *s, 728 struct comedi_insn *insn, unsigned int *data) 729{ 730 int n; 731 int chan; 732 733 chan = devpriv->digital_out_mapping[CR_CHAN(insn->chanspec)]; 734 for (n = 0; n < insn->n; n++) { 735 struct serial_data write; 736 737 write.kind = is_digital; 738 write.index = chan; 739 write.value = data[n]; 740 serial_write(devpriv->tty, write); 741 } 742 return n; 743} 744 745static int serial2002_ai_rinsn(struct comedi_device *dev, 746 struct comedi_subdevice *s, 747 struct comedi_insn *insn, unsigned int *data) 748{ 749 int n; 750 int chan; 751 752 chan = devpriv->analog_in_mapping[CR_CHAN(insn->chanspec)]; 753 for (n = 0; n < insn->n; n++) { 754 struct serial_data read; 755 756 poll_channel(devpriv->tty, chan); 757 while (1) { 758 read = serial_read(devpriv->tty, 1000); 759 if (read.kind != is_channel || read.index == chan) 760 break; 761 } 762 data[n] = read.value; 763 } 764 return n; 765} 766 767static int serial2002_ao_winsn(struct comedi_device *dev, 768 struct comedi_subdevice *s, 769 struct comedi_insn *insn, unsigned int *data) 770{ 771 int n; 772 int chan; 773 774 chan = devpriv->analog_out_mapping[CR_CHAN(insn->chanspec)]; 775 for (n = 0; n < insn->n; n++) { 776 struct serial_data write; 777 778 write.kind = is_channel; 779 write.index = chan; 780 write.value = data[n]; 781 serial_write(devpriv->tty, write); 782 devpriv->ao_readback[chan] = data[n]; 783 } 784 return n; 785} 786 787static int serial2002_ao_rinsn(struct comedi_device *dev, 788 struct comedi_subdevice *s, 789 struct comedi_insn *insn, unsigned int *data) 790{ 791 int n; 792 int chan = CR_CHAN(insn->chanspec); 793 794 for (n = 0; n < insn->n; n++) 795 data[n] = devpriv->ao_readback[chan]; 796 797 return n; 798} 799 800static int serial2002_ei_rinsn(struct comedi_device *dev, 801 struct comedi_subdevice *s, 802 struct comedi_insn *insn, unsigned int *data) 803{ 804 int n; 805 int chan; 806 807 chan = devpriv->encoder_in_mapping[CR_CHAN(insn->chanspec)]; 808 for (n = 0; n < insn->n; n++) { 809 struct serial_data read; 810 811 poll_channel(devpriv->tty, chan); 812 while (1) { 813 read = serial_read(devpriv->tty, 1000); 814 if (read.kind != is_channel || read.index == chan) 815 break; 816 } 817 data[n] = read.value; 818 } 819 return n; 820} 821 822static int serial2002_attach(struct comedi_device *dev, 823 struct comedi_devconfig *it) 824{ 825 struct comedi_subdevice *s; 826 827 printk("comedi%d: serial2002: ", dev->minor); 828 dev->board_name = thisboard->name; 829 if (alloc_private(dev, sizeof(struct serial2002_private)) < 0) 830 return -ENOMEM; 831 dev->open = serial_2002_open; 832 dev->close = serial_2002_close; 833 devpriv->port = it->options[0]; 834 devpriv->speed = it->options[1]; 835 printk("/dev/ttyS%d @ %d\n", devpriv->port, devpriv->speed); 836 837 if (alloc_subdevices(dev, 5) < 0) 838 return -ENOMEM; 839 840 /* digital input subdevice */ 841 s = dev->subdevices + 0; 842 s->type = COMEDI_SUBD_DI; 843 s->subdev_flags = SDF_READABLE; 844 s->n_chan = 0; 845 s->maxdata = 1; 846 s->range_table = &range_digital; 847 s->insn_read = &serial2002_di_rinsn; 848 849 /* digital output subdevice */ 850 s = dev->subdevices + 1; 851 s->type = COMEDI_SUBD_DO; 852 s->subdev_flags = SDF_WRITEABLE; 853 s->n_chan = 0; 854 s->maxdata = 1; 855 s->range_table = &range_digital; 856 s->insn_write = &serial2002_do_winsn; 857 858 /* analog input subdevice */ 859 s = dev->subdevices + 2; 860 s->type = COMEDI_SUBD_AI; 861 s->subdev_flags = SDF_READABLE | SDF_GROUND; 862 s->n_chan = 0; 863 s->maxdata = 1; 864 s->range_table = 0; 865 s->insn_read = &serial2002_ai_rinsn; 866 867 /* analog output subdevice */ 868 s = dev->subdevices + 3; 869 s->type = COMEDI_SUBD_AO; 870 s->subdev_flags = SDF_WRITEABLE; 871 s->n_chan = 0; 872 s->maxdata = 1; 873 s->range_table = 0; 874 s->insn_write = &serial2002_ao_winsn; 875 s->insn_read = &serial2002_ao_rinsn; 876 877 /* encoder input subdevice */ 878 s = dev->subdevices + 4; 879 s->type = COMEDI_SUBD_COUNTER; 880 s->subdev_flags = SDF_READABLE | SDF_LSAMPL; 881 s->n_chan = 0; 882 s->maxdata = 1; 883 s->range_table = 0; 884 s->insn_read = &serial2002_ei_rinsn; 885 886 return 1; 887} 888 889static int serial2002_detach(struct comedi_device *dev) 890{ 891 struct comedi_subdevice *s; 892 int i; 893 894 printk("comedi%d: serial2002: remove\n", dev->minor); 895 for (i = 0; i < 5; i++) { 896 s = &dev->subdevices[i]; 897 kfree(s->maxdata_list); 898 kfree(s->range_table_list); 899 } 900 return 0; 901} 902 903static int __init driver_serial2002_init_module(void) 904{ 905 return comedi_driver_register(&driver_serial2002); 906} 907 908static void __exit driver_serial2002_cleanup_module(void) 909{ 910 comedi_driver_unregister(&driver_serial2002); 911} 912 913module_init(driver_serial2002_init_module); 914module_exit(driver_serial2002_cleanup_module); 915 916MODULE_AUTHOR("Comedi http://www.comedi.org"); 917MODULE_DESCRIPTION("Comedi low-level driver"); 918MODULE_LICENSE("GPL"); 919