drivers/staging/meilhaus/me8100_di.c

   1 /**
   2  * @file me8100_di.c
   3  *
   4  * @brief ME-8100 digital input subdevice instance.
   5  * @note Copyright (C) 2007 Meilhaus Electronic GmbH (support@meilhaus.de)
   6  * @author Guenter Gebhardt
   7  * @author Krzysztof Gantzke    (k.gantzke@meilhaus.de)
   8  */
   9
  10 /*
  11  * Copyright (C) 2007 Meilhaus Electronic GmbH (support@meilhaus.de)
  12  *
  13  * This file is free software; you can redistribute it and/or modify
  14  * it under the terms of the GNU General Public License as published by
  15  * the Free Software Foundation; either version 2 of the License, or
  16  * (at your option) any later version.
  17  *
  18  * This program is distributed in the hope that it will be useful,
  19  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  20  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  21  * GNU General Public License for more details.
  22  *
  23  * You should have received a copy of the GNU General Public License
  24  * along with this program; if not, write to the Free Software
  25  * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  26  */
  27
  28 #ifndef __KERNEL__
  29 #  define __KERNEL__
  30 #endif
  31
  32 /*
  33  * Includes
  34  */
  35 #include <linux/module.h>
  36
  37 #include <linux/slab.h>
  38 #include <linux/spinlock.h>
  39 #include <linux/io.h>
  40 #include <linux/types.h>
  41 #include <linux/interrupt.h>
  42 #include <linux/version.h>
  43
  44 #include "medefines.h"
  45 #include "meerror.h"
  46
  47 #include "meids.h"
  48 #include "medebug.h"
  49 #include "meplx_reg.h"
  50 #include "me8100_reg.h"
  51 #include "me8100_di_reg.h"
  52 #include "me8100_di.h"
  53
  54 /*
  55  * Defines
  56  */
  57
  58 /*
  59  * Functions
  60  */
  61
  62 static int me8100_di_io_reset_subdevice(struct me_subdevice *subdevice,
  63                                         struct file *filep, int flags)
  64 {
  65         me8100_di_subdevice_t *instance;
  66         unsigned short ctrl;
  67         unsigned long cpu_flags;
  68
  69         PDEBUG("executed.\n");
  70
  71         instance = (me8100_di_subdevice_t *) subdevice;
  72
  73         if (flags) {
  74                 PERROR("Invalid flag specified.\n");
  75                 return ME_ERRNO_INVALID_FLAGS;
  76         }
  77
  78         ME_SUBDEVICE_ENTER;
  79
  80         spin_lock_irqsave(&instance->subdevice_lock, cpu_flags);
  81         spin_lock(instance->ctrl_reg_lock);
  82         ctrl = inw(instance->ctrl_reg);
  83         ctrl &= ~(ME8100_DIO_CTRL_BIT_INTB_1 | ME8100_DIO_CTRL_BIT_INTB_0);
  84         outw(ctrl, instance->ctrl_reg);
  85         PDEBUG_REG("ctrl_reg outl(0x%lX+0x%lX)=0x%x\n", instance->reg_base,
  86                    instance->ctrl_reg - instance->reg_base, ctrl);
  87         spin_unlock(instance->ctrl_reg_lock);
  88
  89         outw(0, instance->mask_reg);
  90         PDEBUG_REG("mask_reg outw(0x%lX+0x%lX)=0x%x\n", instance->reg_base,
  91                    instance->mask_reg - instance->reg_base, 0);
  92         outw(0, instance->pattern_reg);
  93         PDEBUG_REG("pattern_reg outw(0x%lX+0x%lX)=0x%x\n", instance->reg_base,
  94                    instance->pattern_reg - instance->reg_base, 0);
  95         instance->rised = -1;
  96         instance->irq_count = 0;
  97         instance->filtering_flag = 0;
  98         spin_unlock_irqrestore(&instance->subdevice_lock, cpu_flags);
  99
 100         outl(PLX_INTCSR_LOCAL_INT1_EN |
 101              PLX_INTCSR_LOCAL_INT1_POL |
 102              PLX_INTCSR_LOCAL_INT2_EN |
 103              PLX_INTCSR_LOCAL_INT2_POL |
 104              PLX_INTCSR_PCI_INT_EN, instance->irq_status_reg);
 105         PDEBUG_REG("plx:irq_status_reg outl(0x%lX)=0x%x\n",
 106                    instance->irq_status_reg,
 107                    PLX_INTCSR_LOCAL_INT1_EN | PLX_INTCSR_LOCAL_INT1_POL |
 108                    PLX_INTCSR_LOCAL_INT2_EN | PLX_INTCSR_LOCAL_INT2_POL |
 109                    PLX_INTCSR_PCI_INT_EN);
 110
 111         wake_up_interruptible_all(&instance->wait_queue);
 112         ME_SUBDEVICE_EXIT;
 113
 114         return ME_ERRNO_SUCCESS;
 115 }
 116
 117 static int me8100_di_io_irq_start(me_subdevice_t *subdevice,
 118                                   struct file *filep,
 119                                   int channel,
 120                                   int irq_source,
 121                                   int irq_edge, int irq_arg, int flags)
 122 {
 123         me8100_di_subdevice_t *instance;
 124         int err = ME_ERRNO_SUCCESS;
 125         uint16_t ctrl;
 126         unsigned long cpu_flags;
 127
 128         PDEBUG("executed.\n");
 129
 130         instance = (me8100_di_subdevice_t *) subdevice;
 131
 132         if (irq_source == ME_IRQ_SOURCE_DIO_PATTERN) {
 133                 if (flags &
 134                     ~(ME_IO_IRQ_START_PATTERN_FILTERING |
 135                       ME_IO_IRQ_START_DIO_WORD)) {
 136                         PERROR("Invalid flag specified.\n");
 137                         return ME_ERRNO_INVALID_FLAGS;
 138                 }
 139
 140                 if (irq_edge != ME_IRQ_EDGE_NOT_USED) {
 141                         PERROR("Invalid irq edge specified.\n");
 142                         return ME_ERRNO_INVALID_IRQ_EDGE;
 143                 }
 144         } else if (irq_source == ME_IRQ_SOURCE_DIO_MASK) {
 145                 if (flags &
 146                     ~(ME_IO_IRQ_START_EXTENDED_STATUS |
 147                       ME_IO_IRQ_START_DIO_WORD)) {
 148                         PERROR("Invalid flag specified.\n");
 149                         return ME_ERRNO_INVALID_FLAGS;
 150                 }
 151
 152                 if (irq_edge != ME_IRQ_EDGE_ANY) {
 153                         PERROR("Invalid irq edge specified.\n");
 154                         return ME_ERRNO_INVALID_IRQ_EDGE;
 155                 }
 156
 157                 if (!(irq_arg & 0xFFFF)) {
 158                         PERROR("No mask specified.\n");
 159                         return ME_ERRNO_INVALID_IRQ_ARG;
 160                 }
 161         } else {
 162                 PERROR("Invalid irq source specified.\n");
 163                 return ME_ERRNO_INVALID_IRQ_SOURCE;
 164         }
 165
 166         if (channel) {
 167                 PERROR("Invalid channel specified.\n");
 168                 return ME_ERRNO_INVALID_CHANNEL;
 169         }
 170
 171         ME_SUBDEVICE_ENTER;
 172
 173         spin_lock_irqsave(&instance->subdevice_lock, cpu_flags);
 174         if (irq_source == ME_IRQ_SOURCE_DIO_PATTERN) {
 175                 outw(irq_arg, instance->pattern_reg);
 176                 instance->compare_value = irq_arg;
 177                 instance->filtering_flag =
 178                     (flags & ME_IO_IRQ_START_PATTERN_FILTERING) ? 1 : 0;
 179         }
 180         if (irq_source == ME_IRQ_SOURCE_DIO_MASK) {
 181                 outw(irq_arg, instance->mask_reg);
 182         }
 183
 184         spin_lock(instance->ctrl_reg_lock);
 185         ctrl = inw(instance->ctrl_reg);
 186         ctrl |= ME8100_DIO_CTRL_BIT_INTB_0;
 187         if (irq_source == ME_IRQ_SOURCE_DIO_PATTERN) {
 188                 ctrl &= ~ME8100_DIO_CTRL_BIT_INTB_1;
 189         }
 190
 191         if (irq_source == ME_IRQ_SOURCE_DIO_MASK) {
 192                 ctrl |= ME8100_DIO_CTRL_BIT_INTB_1;
 193         }
 194         outw(ctrl, instance->ctrl_reg);
 195         PDEBUG_REG("ctrl_reg outw(0x%lX+0x%lX)=0x%x\n", instance->reg_base,
 196                    instance->ctrl_reg - instance->reg_base, ctrl);
 197         spin_unlock(instance->ctrl_reg_lock);
 198
 199         instance->rised = 0;
 200         instance->status_value = 0;
 201         instance->status_value_edges = 0;
 202         instance->line_value = inw(instance->port_reg);
 203         instance->status_flag = flags & ME_IO_IRQ_START_EXTENDED_STATUS;
 204         spin_unlock_irqrestore(&instance->subdevice_lock, cpu_flags);
 205
 206         ME_SUBDEVICE_EXIT;
 207
 208         return err;
 209 }
 210
 211 static int me8100_di_io_irq_wait(me_subdevice_t *subdevice,
 212                                  struct file *filep,
 213                                  int channel,
 214                                  int *irq_count,
 215                                  int *value, int time_out, int flags)
 216 {
 217         me8100_di_subdevice_t *instance;
 218         int err = ME_ERRNO_SUCCESS;
 219         long t = 0;
 220         unsigned long cpu_flags;
 221         int count;
 222
 223         PDEBUG("executed.\n");
 224         PDEVELOP("PID: %d.\n", current->pid);
 225
 226         instance = (me8100_di_subdevice_t *) subdevice;
 227
 228         if (flags &
 229             ~(ME_IO_IRQ_WAIT_NORMAL_STATUS | ME_IO_IRQ_WAIT_EXTENDED_STATUS)) {
 230                 PERROR("Invalid flag specified.\n");
 231                 return ME_ERRNO_INVALID_FLAGS;
 232         }
 233
 234         if (channel) {
 235                 PERROR("Invalid channel specified.\n");
 236                 return ME_ERRNO_INVALID_CHANNEL;
 237         }
 238
 239         if (time_out < 0) {
 240                 PERROR("Invalid time_out specified.\n");
 241                 return ME_ERRNO_INVALID_TIMEOUT;
 242         }
 243
 244         if (time_out) {
 245                 t = (time_out * HZ) / 1000;
 246
 247                 if (t == 0)
 248                         t = 1;
 249         }
 250
 251         ME_SUBDEVICE_ENTER;
 252
 253         if (instance->rised <= 0) {
 254                 instance->rised = 0;
 255                 count = instance->irq_count;
 256
 257                 if (time_out) {
 258                         t = wait_event_interruptible_timeout(instance->
 259                                                              wait_queue,
 260                                                              ((count !=
 261                                                                instance->
 262                                                                irq_count)
 263                                                               || (instance->
 264                                                                   rised < 0)),
 265                                                              t);
 266 //                      t = wait_event_interruptible_timeout(instance->wait_queue, (instance->rised != 0), t);
 267                         if (t == 0) {
 268                                 PERROR("Wait on interrupt timed out.\n");
 269                                 err = ME_ERRNO_TIMEOUT;
 270                         }
 271                 } else {
 272                         wait_event_interruptible(instance->wait_queue,
 273                                                  ((count != instance->irq_count)
 274                                                   || (instance->rised < 0)));
 275 //                      wait_event_interruptible(instance->wait_queue, (instance->rised != 0));
 276                 }
 277
 278                 if (instance->rised < 0) {
 279                         PERROR("Wait on interrupt aborted by user.\n");
 280                         err = ME_ERRNO_CANCELLED;
 281                 }
 282         }
 283
 284         if (signal_pending(current)) {
 285                 PERROR("Wait on interrupt aborted by signal.\n");
 286                 err = ME_ERRNO_SIGNAL;
 287         }
 288
 289         spin_lock_irqsave(&instance->subdevice_lock, cpu_flags);
 290         *irq_count = instance->irq_count;
 291         if (!err) {
 292                 if (flags & ME_IO_IRQ_WAIT_NORMAL_STATUS) {
 293                         *value = instance->status_value;
 294                 } else if (flags & ME_IO_IRQ_WAIT_EXTENDED_STATUS) {
 295                         *value = instance->status_value_edges;
 296                 } else {        // Use default
 297                         if (!instance->status_flag) {
 298                                 *value = instance->status_value;
 299                         } else {
 300                                 *value = instance->status_value_edges;
 301                         }
 302                 }
 303                 instance->rised = 0;
 304 /*
 305                         instance->status_value = 0;
 306                         instance->status_value_edges = 0;
 307 */
 308         } else {
 309                 *value = 0;
 310         }
 311         spin_unlock_irqrestore(&instance->subdevice_lock, cpu_flags);
 312
 313         ME_SUBDEVICE_EXIT;
 314
 315         return err;
 316 }
 317
 318 static int me8100_di_io_irq_stop(me_subdevice_t *subdevice,
 319                                  struct file *filep, int channel, int flags)
 320 {
 321         me8100_di_subdevice_t *instance;
 322         uint16_t ctrl;
 323         unsigned long cpu_flags;
 324
 325         PDEBUG("executed.\n");
 326
 327         instance = (me8100_di_subdevice_t *) subdevice;
 328
 329         if (flags) {
 330                 PERROR("Invalid flag specified.\n");
 331                 return ME_ERRNO_INVALID_FLAGS;
 332         }
 333
 334         if (channel) {
 335                 PERROR("Invalid channel specified.\n");
 336                 return ME_ERRNO_INVALID_CHANNEL;
 337         }
 338
 339         ME_SUBDEVICE_ENTER;
 340
 341         spin_lock_irqsave(&instance->subdevice_lock, cpu_flags);
 342         spin_lock(instance->ctrl_reg_lock);
 343         ctrl = inw(instance->ctrl_reg);
 344         ctrl &= ~(ME8100_DIO_CTRL_BIT_INTB_1 | ME8100_DIO_CTRL_BIT_INTB_0);
 345         outw(ctrl, instance->ctrl_reg);
 346         PDEBUG_REG("ctrl_reg outw(0x%lX+0x%lX)=0x%x\n", instance->reg_base,
 347                    instance->ctrl_reg - instance->reg_base, ctrl);
 348         spin_unlock(instance->ctrl_reg_lock);
 349         instance->rised = -1;
 350         instance->status_value = 0;
 351         instance->status_value_edges = 0;
 352         instance->filtering_flag = 0;
 353         spin_unlock_irqrestore(&instance->subdevice_lock, cpu_flags);
 354         wake_up_interruptible_all(&instance->wait_queue);
 355
 356         ME_SUBDEVICE_EXIT;
 357
 358         return ME_ERRNO_SUCCESS;
 359 }
 360
 361 static int me8100_di_io_single_config(me_subdevice_t *subdevice,
 362                                       struct file *filep,
 363                                       int channel,
 364                                       int single_config,
 365                                       int ref,
 366                                       int trig_chan,
 367                                       int trig_type, int trig_edge, int flags)
 368 {
 369         me8100_di_subdevice_t *instance;
 370         int err = ME_ERRNO_SUCCESS;
 371
 372         PDEBUG("executed.\n");
 373
 374         instance = (me8100_di_subdevice_t *) subdevice;
 375
 376         ME_SUBDEVICE_ENTER;
 377
 378         spin_lock(&instance->subdevice_lock);
 379
 380         switch (flags) {
 381         case ME_IO_SINGLE_CONFIG_NO_FLAGS:
 382         case ME_IO_SINGLE_CONFIG_DIO_WORD:
 383                 if (channel == 0) {
 384                         if (single_config == ME_SINGLE_CONFIG_DIO_INPUT) {
 385                         } else {
 386                                 PERROR
 387                                     ("Invalid port configuration specified.\n");
 388                                 err = ME_ERRNO_INVALID_SINGLE_CONFIG;
 389                         }
 390                 } else {
 391                         PERROR("Invalid channel number.\n");
 392                         err = ME_ERRNO_INVALID_CHANNEL;
 393                 }
 394                 break;
 395
 396         default:
 397                 PERROR("Invalid flags specified.\n");
 398                 err = ME_ERRNO_INVALID_FLAGS;
 399         }
 400
 401         spin_unlock(&instance->subdevice_lock);
 402
 403         ME_SUBDEVICE_EXIT;
 404
 405         return err;
 406 }
 407
 408 static int me8100_di_io_single_read(me_subdevice_t *subdevice,
 409                                     struct file *filep,
 410                                     int channel,
 411                                     int *value, int time_out, int flags)
 412 {
 413         me8100_di_subdevice_t *instance;
 414         int err = ME_ERRNO_SUCCESS;
 415
 416         PDEBUG("executed.\n");
 417
 418         instance = (me8100_di_subdevice_t *) subdevice;
 419
 420         ME_SUBDEVICE_ENTER;
 421
 422         spin_lock(&instance->subdevice_lock);
 423
 424         switch (flags) {
 425
 426         case ME_IO_SINGLE_TYPE_DIO_BIT:
 427                 if ((channel >= 0) && (channel < 16)) {
 428                         *value = inw(instance->port_reg) & (0x1 << channel);
 429                 } else {
 430                         PERROR("Invalid bit number specified.\n");
 431                         err = ME_ERRNO_INVALID_CHANNEL;
 432                 }
 433                 break;
 434
 435         case ME_IO_SINGLE_TYPE_DIO_BYTE:
 436                 if (channel == 0) {
 437                         *value = inw(instance->port_reg) & 0xFF;
 438                 } else if (channel == 1) {
 439                         *value = (inw(instance->port_reg) >> 8) & 0xFF;
 440                 } else {
 441                         PERROR("Invalid byte number specified.\n");
 442                         err = ME_ERRNO_INVALID_CHANNEL;
 443                 }
 444                 break;
 445
 446         case ME_IO_SINGLE_NO_FLAGS:
 447         case ME_IO_SINGLE_TYPE_DIO_WORD:
 448                 if (channel == 0) {
 449                         *value = inw(instance->port_reg);
 450                 } else {
 451                         PERROR("Invalid word number specified.\n");
 452                         err = ME_ERRNO_INVALID_CHANNEL;
 453                 }
 454
 455                 break;
 456
 457         default:
 458                 PERROR("Invalid flags specified.\n");
 459                 err = ME_ERRNO_INVALID_FLAGS;
 460         }
 461
 462         spin_unlock(&instance->subdevice_lock);
 463
 464         ME_SUBDEVICE_EXIT;
 465
 466         return err;
 467 }
 468
 469 static int me8100_di_query_number_channels(me_subdevice_t *subdevice,
 470                                            int *number)
 471 {
 472         PDEBUG("executed.\n");
 473         *number = 16;
 474         return ME_ERRNO_SUCCESS;
 475 }
 476
 477 static int me8100_di_query_subdevice_type(me_subdevice_t *subdevice,
 478                                           int *type, int *subtype)
 479 {
 480         PDEBUG("executed.\n");
 481         *type = ME_TYPE_DI;
 482         *subtype = ME_SUBTYPE_SINGLE;
 483         return ME_ERRNO_SUCCESS;
 484 }
 485
 486 static int me8100_di_query_subdevice_caps(me_subdevice_t *subdevice, int *caps)
 487 {
 488         PDEBUG("executed.\n");
 489         *caps = ME_CAPS_DIO_BIT_PATTERN_IRQ | ME_CAPS_DIO_BIT_MASK_IRQ_EDGE_ANY;
 490         return ME_ERRNO_SUCCESS;
 491 }
 492
 493 static void me8100_di_destructor(struct me_subdevice *subdevice)
 494 {
 495         me8100_di_subdevice_t *instance;
 496
 497         PDEBUG("executed.\n");
 498
 499         instance = (me8100_di_subdevice_t *) subdevice;
 500
 501         free_irq(instance->irq, (void *)instance);
 502         me_subdevice_deinit(&instance->base);
 503         kfree(instance);
 504 }
 505
 506 static irqreturn_t me8100_isr(int irq, void *dev_id)
 507 {
 508         me8100_di_subdevice_t *instance;
 509         uint32_t icsr;
 510
 511         uint16_t irq_status;
 512         uint16_t line_value = 0;
 513
 514         uint32_t status_val = 0;
 515
 516         PDEBUG("executed.\n");
 517
 518         instance = (me8100_di_subdevice_t *) dev_id;
 519
 520         if (irq != instance->irq) {
 521                 PERROR("Incorrect interrupt num: %d.\n", irq);
 522                 return IRQ_NONE;
 523         }
 524
 525         icsr = inl(instance->irq_status_reg);
 526         if (instance->di_idx == 0) {
 527
 528                 if ((icsr &
 529                      (PLX_INTCSR_LOCAL_INT1_STATE | PLX_INTCSR_PCI_INT_EN |
 530                       PLX_INTCSR_LOCAL_INT1_EN)) !=
 531                     (PLX_INTCSR_LOCAL_INT1_STATE | PLX_INTCSR_PCI_INT_EN |
 532                      PLX_INTCSR_LOCAL_INT1_EN)) {
 533                         PINFO
 534                             ("%ld Shared interrupt. %s(): idx=0 plx:irq_status_reg=0x%04X\n",
 535                              jiffies, __func__, icsr);
 536                         return IRQ_NONE;
 537                 }
 538         } else if (instance->di_idx == 1) {
 539                 if ((icsr &
 540                      (PLX_INTCSR_LOCAL_INT2_STATE | PLX_INTCSR_PCI_INT_EN |
 541                       PLX_INTCSR_LOCAL_INT2_EN)) !=
 542                     (PLX_INTCSR_LOCAL_INT2_STATE | PLX_INTCSR_PCI_INT_EN |
 543                      PLX_INTCSR_LOCAL_INT2_EN)) {
 544                         PINFO
 545                             ("%ld Shared interrupt. %s(): idx=1 plx:irq_status_reg=0x%04X\n",
 546                              jiffies, __func__, icsr);
 547                         return IRQ_NONE;
 548                 }
 549         } else {
 550                 PERROR("%s():Wrong interrupt idx=%d csr=0x%X.\n", __func__,
 551                        instance->di_idx, icsr);
 552                 return IRQ_NONE;
 553         }
 554
 555         PDEBUG("me8100_isr():Interrupt from idx=%d occured.\n",
 556                instance->di_idx);
 557         spin_lock(&instance->subdevice_lock);
 558         inw(instance->irq_reset_reg);
 559         line_value = inw(instance->port_reg);
 560
 561         irq_status = instance->line_value ^ line_value;
 562
 563         // Make extended information.
 564         status_val |= (0x00FF & (~(uint16_t) instance->line_value & line_value)) << 16; //Raise
 565         status_val |= (0x00FF & ((uint16_t) instance->line_value & ~line_value));       //Fall
 566
 567         instance->line_value = line_value;
 568
 569         if (instance->rised == 0) {
 570                 instance->status_value = irq_status;
 571                 instance->status_value_edges = status_val;
 572         } else {
 573                 instance->status_value |= irq_status;
 574                 instance->status_value_edges |= status_val;
 575         }
 576
 577         if (instance->filtering_flag) { // For compare mode only.
 578                 if (instance->compare_value == instance->line_value) {
 579                         instance->rised = 1;
 580                         instance->irq_count++;
 581                 }
 582         } else {
 583                 instance->rised = 1;
 584                 instance->irq_count++;
 585         }
 586
 587         spin_unlock(&instance->subdevice_lock);
 588         wake_up_interruptible_all(&instance->wait_queue);
 589
 590         return IRQ_HANDLED;
 591 }
 592
 593 me8100_di_subdevice_t *me8100_di_constructor(uint32_t me8100_reg_base,
 594                                              uint32_t plx_reg_base,
 595                                              unsigned int di_idx,
 596                                              int irq,
 597                                              spinlock_t *ctrl_reg_lock)
 598 {
 599         me8100_di_subdevice_t *subdevice;
 600         int err;
 601
 602         PDEBUG("executed.\n");
 603
 604         /* Allocate memory for subdevice instance */
 605         subdevice = kmalloc(sizeof(me8100_di_subdevice_t), GFP_KERNEL);
 606
 607         if (!subdevice) {
 608                 PERROR("Cannot get memory for subdevice instance.\n");
 609                 return NULL;
 610         }
 611
 612         memset(subdevice, 0, sizeof(me8100_di_subdevice_t));
 613
 614         /* Initialize subdevice base class */
 615         err = me_subdevice_init(&subdevice->base);
 616
 617         if (err) {
 618                 PERROR("Cannot initialize subdevice base class instance.\n");
 619                 kfree(subdevice);
 620                 return NULL;
 621         }
 622         // Initialize spin locks.
 623         spin_lock_init(&subdevice->subdevice_lock);
 624
 625         subdevice->ctrl_reg_lock = ctrl_reg_lock;
 626
 627         /* Save the subdevice index. */
 628         subdevice->di_idx = di_idx;
 629
 630         /* Initialize wait queue */
 631         init_waitqueue_head(&subdevice->wait_queue);
 632
 633         /* Register interrupt service routine. */
 634         subdevice->irq = irq;
 635         err = request_irq(subdevice->irq, me8100_isr,
 636                           IRQF_DISABLED | IRQF_SHARED,
 637                           ME8100_NAME, (void *)subdevice);
 638
 639         if (err) {
 640                 PERROR("Cannot initialize subdevice base class instance.\n");
 641                 kfree(subdevice);
 642                 return NULL;
 643         }
 644         PINFO("Registered irq=%d.\n", subdevice->irq);
 645
 646         /* Initialize the registers */
 647         subdevice->ctrl_reg =
 648             me8100_reg_base + ME8100_CTRL_REG_A + di_idx * ME8100_REG_OFFSET;
 649         subdevice->port_reg =
 650             me8100_reg_base + ME8100_DI_REG_A + di_idx * ME8100_REG_OFFSET;
 651         subdevice->mask_reg =
 652             me8100_reg_base + ME8100_MASK_REG_A + di_idx * ME8100_REG_OFFSET;
 653         subdevice->pattern_reg =
 654             me8100_reg_base + ME8100_PATTERN_REG_A + di_idx * ME8100_REG_OFFSET;
 655         subdevice->din_int_reg =
 656             me8100_reg_base + ME8100_INT_DI_REG_A + di_idx * ME8100_REG_OFFSET;
 657         subdevice->irq_reset_reg =
 658             me8100_reg_base + ME8100_RES_INT_REG_A + di_idx * ME8100_REG_OFFSET;
 659         subdevice->irq_status_reg = plx_reg_base + PLX_INTCSR;
 660 #ifdef MEDEBUG_DEBUG_REG
 661         subdevice->reg_base = me8100_reg_base;
 662 #endif
 663
 664         /* Overload base class methods. */
 665         subdevice->base.me_subdevice_io_irq_start = me8100_di_io_irq_start;
 666         subdevice->base.me_subdevice_io_irq_wait = me8100_di_io_irq_wait;
 667         subdevice->base.me_subdevice_io_irq_stop = me8100_di_io_irq_stop;
 668         subdevice->base.me_subdevice_io_reset_subdevice =
 669             me8100_di_io_reset_subdevice;
 670         subdevice->base.me_subdevice_io_single_config =
 671             me8100_di_io_single_config;
 672         subdevice->base.me_subdevice_io_single_read = me8100_di_io_single_read;
 673         subdevice->base.me_subdevice_query_number_channels =
 674             me8100_di_query_number_channels;
 675         subdevice->base.me_subdevice_query_subdevice_type =
 676             me8100_di_query_subdevice_type;
 677         subdevice->base.me_subdevice_query_subdevice_caps =
 678             me8100_di_query_subdevice_caps;
 679         subdevice->base.me_subdevice_destructor = me8100_di_destructor;
 680
 681         subdevice->rised = 0;
 682         subdevice->irq_count = 0;
 683
 684         return subdevice;
 685 }