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   1 /**
   2  * @file me6000_dio.c
   3  *
   4  * @brief ME-6000 digital input/output 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
  42 #include "medefines.h"
  43 #include "meinternal.h"
  44 #include "meerror.h"
  45
  46 #include "medebug.h"
  47 #include "me6000_dio_reg.h"
  48 #include "me6000_dio.h"
  49
  50 /*
  51  * Defines
  52  */
  53
  54 /*
  55  * Functions
  56  */
  57
  58 static int me6000_dio_io_reset_subdevice(struct me_subdevice *subdevice,
  59                                          struct file *filep, int flags)
  60 {
  61         me6000_dio_subdevice_t *instance;
  62         uint8_t mode;
  63
  64         PDEBUG("executed.\n");
  65
  66         instance = (me6000_dio_subdevice_t *) subdevice;
  67
  68         if (flags) {
  69                 PERROR("Invalid flag specified.\n");
  70                 return ME_ERRNO_INVALID_FLAGS;
  71         }
  72
  73         ME_SUBDEVICE_ENTER;
  74
  75         spin_lock(&instance->subdevice_lock);
  76         spin_lock(instance->ctrl_reg_lock);
  77         mode = inb(instance->ctrl_reg);
  78         mode &= ~(0x3 << (instance->dio_idx * 2));
  79         outb(mode, instance->ctrl_reg);
  80         PDEBUG_REG("ctrl_reg outl(0x%lX+0x%lX)=0x%x\n", instance->reg_base,
  81                    instance->ctrl_reg - instance->reg_base, mode);
  82         spin_unlock(instance->ctrl_reg_lock);
  83
  84         outb(0x00, instance->port_reg);
  85         PDEBUG_REG("ctrl_reg outl(0x%lX+0x%lX)=0x%x\n", instance->reg_base,
  86                    instance->ctrl_reg - instance->reg_base, 0x00);
  87         spin_unlock(&instance->subdevice_lock);
  88
  89         ME_SUBDEVICE_EXIT;
  90
  91         return ME_ERRNO_SUCCESS;
  92 }
  93
  94 static int me6000_dio_io_single_config(me_subdevice_t *subdevice,
  95                                        struct file *filep,
  96                                        int channel,
  97                                        int single_config,
  98                                        int ref,
  99                                        int trig_chan,
 100                                        int trig_type, int trig_edge, int flags)
 101 {
 102         me6000_dio_subdevice_t *instance;
 103         int err = ME_ERRNO_SUCCESS;
 104         uint8_t mode;
 105         int size =
 106             flags & (ME_IO_SINGLE_CONFIG_DIO_BIT | ME_IO_SINGLE_CONFIG_DIO_BYTE
 107                      | ME_IO_SINGLE_CONFIG_DIO_WORD |
 108                      ME_IO_SINGLE_CONFIG_DIO_DWORD);
 109
 110         PDEBUG("executed.\n");
 111
 112         instance = (me6000_dio_subdevice_t *) subdevice;
 113
 114         ME_SUBDEVICE_ENTER spin_lock(&instance->subdevice_lock);
 115         spin_lock(instance->ctrl_reg_lock);
 116         mode = inb(instance->ctrl_reg);
 117         switch (size) {
 118         case ME_IO_SINGLE_CONFIG_NO_FLAGS:
 119         case ME_IO_SINGLE_CONFIG_DIO_BYTE:
 120                 if (channel == 0) {
 121                         if (single_config == ME_SINGLE_CONFIG_DIO_INPUT) {
 122                                 mode &=
 123                                     ~((ME6000_DIO_CTRL_BIT_MODE_0 |
 124                                        ME6000_DIO_CTRL_BIT_MODE_1) <<
 125                                       (instance->dio_idx * 2));
 126                         } else if (single_config == ME_SINGLE_CONFIG_DIO_OUTPUT) {
 127                                 mode &=
 128                                     ~((ME6000_DIO_CTRL_BIT_MODE_0 |
 129                                        ME6000_DIO_CTRL_BIT_MODE_1) <<
 130                                       (instance->dio_idx * 2));
 131                                 mode |=
 132                                     ME6000_DIO_CTRL_BIT_MODE_0 << (instance->
 133                                                                    dio_idx * 2);
 134                         } else {
 135                                 PERROR
 136                                     ("Invalid port configuration specified.\n");
 137                                 err = ME_ERRNO_INVALID_SINGLE_CONFIG;
 138                         }
 139                 } else {
 140                         PERROR("Invalid channel number.\n");
 141                         err = ME_ERRNO_INVALID_CHANNEL;
 142                 }
 143                 break;
 144
 145         default:
 146                 PERROR("Invalid flags.\n");
 147                 err = ME_ERRNO_INVALID_FLAGS;
 148         }
 149
 150         if (!err) {
 151                 outb(mode, instance->ctrl_reg);
 152                 PDEBUG_REG("ctrl_reg outl(0x%lX+0x%lX)=0x%x\n",
 153                            instance->reg_base,
 154                            instance->ctrl_reg - instance->reg_base, mode);
 155         }
 156         spin_unlock(instance->ctrl_reg_lock);
 157         spin_unlock(&instance->subdevice_lock);
 158
 159         ME_SUBDEVICE_EXIT;
 160
 161         return err;
 162 }
 163
 164 static int me6000_dio_io_single_read(me_subdevice_t *subdevice,
 165                                      struct file *filep,
 166                                      int channel,
 167                                      int *value, int time_out, int flags)
 168 {
 169         me6000_dio_subdevice_t *instance;
 170         int err = ME_ERRNO_SUCCESS;
 171         uint8_t mode;
 172
 173         PDEBUG("executed.\n");
 174
 175         instance = (me6000_dio_subdevice_t *) subdevice;
 176
 177         ME_SUBDEVICE_ENTER spin_lock(&instance->subdevice_lock);
 178         spin_lock(instance->ctrl_reg_lock);
 179         switch (flags) {
 180         case ME_IO_SINGLE_TYPE_DIO_BIT:
 181                 if ((channel >= 0) && (channel < 8)) {
 182                         mode =
 183                             inb(instance->
 184                                 ctrl_reg) & ((ME6000_DIO_CTRL_BIT_MODE_0 |
 185                                               ME6000_DIO_CTRL_BIT_MODE_1) <<
 186                                              (instance->dio_idx * 2));
 187                         if ((mode ==
 188                              (ME6000_DIO_CTRL_BIT_MODE_0 <<
 189                               (instance->dio_idx * 2))) || !mode) {
 190                                 *value =
 191                                     inb(instance->port_reg) & (0x1 << channel);
 192                         } else {
 193                                 PERROR("Port not in output or input mode.\n");
 194                                 err = ME_ERRNO_PREVIOUS_CONFIG;
 195                         }
 196                 } else {
 197                         PERROR("Invalid bit number specified.\n");
 198                         err = ME_ERRNO_INVALID_CHANNEL;
 199                 }
 200                 break;
 201
 202         case ME_IO_SINGLE_NO_FLAGS:
 203         case ME_IO_SINGLE_TYPE_DIO_BYTE:
 204                 if (channel == 0) {
 205                         mode =
 206                             inb(instance->
 207                                 ctrl_reg) & ((ME6000_DIO_CTRL_BIT_MODE_0 |
 208                                               ME6000_DIO_CTRL_BIT_MODE_1) <<
 209                                              (instance->dio_idx * 2));
 210                         if ((mode ==
 211                              (ME6000_DIO_CTRL_BIT_MODE_0 <<
 212                               (instance->dio_idx * 2))) || !mode) {
 213                                 *value = inb(instance->port_reg) & 0x00FF;
 214                         } else {
 215                                 PERROR("Port not in output or input mode.\n");
 216                                 err = ME_ERRNO_PREVIOUS_CONFIG;
 217                         }
 218                 } else {
 219                         PERROR("Invalid byte number specified.\n");
 220                         err = ME_ERRNO_INVALID_CHANNEL;
 221                 }
 222                 break;
 223
 224         default:
 225                 PERROR("Invalid flags specified.\n");
 226                 err = ME_ERRNO_INVALID_FLAGS;
 227         }
 228         spin_unlock(instance->ctrl_reg_lock);
 229         spin_unlock(&instance->subdevice_lock);
 230
 231         ME_SUBDEVICE_EXIT;
 232
 233         return err;
 234 }
 235
 236 static int me6000_dio_io_single_write(me_subdevice_t *subdevice,
 237                                       struct file *filep,
 238                                       int channel,
 239                                       int value, int time_out, int flags)
 240 {
 241         me6000_dio_subdevice_t *instance;
 242         int err = ME_ERRNO_SUCCESS;
 243         uint8_t mode;
 244         uint8_t byte;
 245
 246         PDEBUG("executed.\n");
 247
 248         instance = (me6000_dio_subdevice_t *) subdevice;
 249
 250         ME_SUBDEVICE_ENTER spin_lock(&instance->subdevice_lock);
 251         spin_lock(instance->ctrl_reg_lock);
 252         switch (flags) {
 253         case ME_IO_SINGLE_TYPE_DIO_BIT:
 254                 if ((channel >= 0) && (channel < 8)) {
 255                         mode =
 256                             inb(instance->
 257                                 ctrl_reg) & ((ME6000_DIO_CTRL_BIT_MODE_0 |
 258                                               ME6000_DIO_CTRL_BIT_MODE_1) <<
 259                                              (instance->dio_idx * 2));
 260
 261                         if (mode ==
 262                             (ME6000_DIO_CTRL_BIT_MODE_0 <<
 263                              (instance->dio_idx * 2))) {
 264                                 byte = inb(instance->port_reg) & 0x00FF;
 265
 266                                 if (value)
 267                                         byte |= 0x1 << channel;
 268                                 else
 269                                         byte &= ~(0x1 << channel);
 270
 271                                 outb(byte, instance->port_reg);
 272                         } else {
 273                                 PERROR("Port not in output or input mode.\n");
 274                                 err = ME_ERRNO_PREVIOUS_CONFIG;
 275                         }
 276                 } else {
 277                         PERROR("Invalid bit number specified.\n");
 278                         err = ME_ERRNO_INVALID_CHANNEL;
 279                 }
 280                 break;
 281
 282         case ME_IO_SINGLE_NO_FLAGS:
 283         case ME_IO_SINGLE_TYPE_DIO_BYTE:
 284                 if (channel == 0) {
 285                         mode =
 286                             inb(instance->
 287                                 ctrl_reg) & ((ME6000_DIO_CTRL_BIT_MODE_0 |
 288                                               ME6000_DIO_CTRL_BIT_MODE_1) <<
 289                                              (instance->dio_idx * 2));
 290
 291                         if (mode ==
 292                             (ME6000_DIO_CTRL_BIT_MODE_0 <<
 293                              (instance->dio_idx * 2))) {
 294                                 outb(value, instance->port_reg);
 295                         } else {
 296                                 PERROR("Port not in output or input mode.\n");
 297                                 err = ME_ERRNO_PREVIOUS_CONFIG;
 298                         }
 299                 } else {
 300                         PERROR("Invalid byte number specified.\n");
 301                         err = ME_ERRNO_INVALID_CHANNEL;
 302                 }
 303                 break;
 304
 305         default:
 306                 PERROR("Invalid flags specified.\n");
 307                 err = ME_ERRNO_INVALID_FLAGS;
 308         }
 309         spin_unlock(instance->ctrl_reg_lock);
 310         spin_unlock(&instance->subdevice_lock);
 311
 312         ME_SUBDEVICE_EXIT;
 313
 314         return err;
 315 }
 316
 317 static int me6000_dio_query_number_channels(me_subdevice_t *subdevice,
 318                                             int *number)
 319 {
 320         PDEBUG("executed.\n");
 321         *number = 8;
 322         return ME_ERRNO_SUCCESS;
 323 }
 324
 325 static int me6000_dio_query_subdevice_type(me_subdevice_t *subdevice,
 326                                            int *type, int *subtype)
 327 {
 328         PDEBUG("executed.\n");
 329         *type = ME_TYPE_DIO;
 330         *subtype = ME_SUBTYPE_SINGLE;
 331         return ME_ERRNO_SUCCESS;
 332 }
 333
 334 static int me6000_dio_query_subdevice_caps(me_subdevice_t *subdevice,
 335                                            int *caps)
 336 {
 337         PDEBUG("executed.\n");
 338         *caps = ME_CAPS_DIO_DIR_BYTE;
 339         return ME_ERRNO_SUCCESS;
 340 }
 341
 342 me6000_dio_subdevice_t *me6000_dio_constructor(uint32_t reg_base,
 343                                                unsigned int dio_idx,
 344                                                spinlock_t *ctrl_reg_lock)
 345 {
 346         me6000_dio_subdevice_t *subdevice;
 347         int err;
 348
 349         PDEBUG("executed.\n");
 350
 351         /* Allocate memory for subdevice instance */
 352         subdevice = kmalloc(sizeof(me6000_dio_subdevice_t), GFP_KERNEL);
 353
 354         if (!subdevice) {
 355                 PERROR("Cannot get memory for subdevice instance.\n");
 356                 return NULL;
 357         }
 358
 359         memset(subdevice, 0, sizeof(me6000_dio_subdevice_t));
 360
 361         /* Initialize subdevice base class */
 362         err = me_subdevice_init(&subdevice->base);
 363         if (err) {
 364                 PERROR("Cannot initialize subdevice base class instance.\n");
 365                 kfree(subdevice);
 366                 return NULL;
 367         }
 368
 369         /* Set the subdevice ports */
 370         subdevice->ctrl_reg = reg_base + ME6000_DIO_CTRL_REG;
 371         switch (dio_idx) {
 372         case 0:
 373                 subdevice->port_reg = reg_base + ME6000_DIO_PORT_0_REG;
 374                 break;
 375         case 1:
 376                 subdevice->port_reg = reg_base + ME6000_DIO_PORT_1_REG;
 377                 break;
 378         default:
 379                 err = ME_ERRNO_INVALID_SUBDEVICE;
 380         }
 381
 382         if (err) {
 383                 PERROR("Cannot initialize subdevice base class instance.\n");
 384                 kfree(subdevice);
 385                 return NULL;
 386         }
 387         // Initialize spin locks.
 388         spin_lock_init(&subdevice->subdevice_lock);
 389
 390         subdevice->ctrl_reg_lock = ctrl_reg_lock;
 391
 392         /* Save digital i/o index */
 393         subdevice->dio_idx = dio_idx;
 394
 395 #ifdef MEDEBUG_DEBUG_REG
 396         subdevice->reg_base = reg_base;
 397 #endif
 398
 399         /* Overload base class methods. */
 400         subdevice->base.me_subdevice_io_reset_subdevice =
 401             me6000_dio_io_reset_subdevice;
 402         subdevice->base.me_subdevice_io_single_config =
 403             me6000_dio_io_single_config;
 404         subdevice->base.me_subdevice_io_single_read = me6000_dio_io_single_read;
 405         subdevice->base.me_subdevice_io_single_write =
 406             me6000_dio_io_single_write;
 407         subdevice->base.me_subdevice_query_number_channels =
 408             me6000_dio_query_number_channels;
 409         subdevice->base.me_subdevice_query_subdevice_type =
 410             me6000_dio_query_subdevice_type;
 411         subdevice->base.me_subdevice_query_subdevice_caps =
 412             me6000_dio_query_subdevice_caps;
 413
 414         return subdevice;
 415 }