drivers/staging/comedi/drivers/serial2002.c

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