drivers/staging/meilhaus/me8100_do.c

   1 /**
   2  * @file me8100_do.c
   3  *
   4  * @brief ME-8100 digital 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 <asm/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 "me8100_reg.h"
  48 #include "me8100_do_reg.h"
  49 #include "me8100_do.h"
  50
  51 /*
  52  * Defines
  53  */
  54
  55 /*
  56  * Functions
  57  */
  58
  59 static int me8100_do_io_reset_subdevice(struct me_subdevice *subdevice,
  60                                         struct file *filep, int flags)
  61 {
  62         me8100_do_subdevice_t *instance;
  63         uint16_t ctrl;
  64
  65         PDEBUG("executed.\n");
  66
  67         instance = (me8100_do_subdevice_t *) subdevice;
  68
  69         if (flags) {
  70                 PERROR("Invalid flag specified.\n");
  71                 return ME_ERRNO_INVALID_FLAGS;
  72         }
  73
  74         ME_SUBDEVICE_ENTER;
  75
  76         spin_lock(&instance->subdevice_lock);
  77         spin_lock(instance->ctrl_reg_lock);
  78         ctrl = inw(instance->ctrl_reg);
  79         ctrl &= ME8100_DIO_CTRL_BIT_INTB_1 | ME8100_DIO_CTRL_BIT_INTB_0;
  80         outw(ctrl, instance->ctrl_reg);
  81         PDEBUG_REG("ctrl_reg outw(0x%lX+0x%lX)=0x%x\n", instance->reg_base,
  82                    instance->ctrl_reg - instance->reg_base, ctrl);
  83         spin_unlock(instance->ctrl_reg_lock);
  84         outw(0, instance->port_reg);
  85         instance->port_reg_mirror = 0;
  86         PDEBUG_REG("port_reg outw(0x%lX+0x%lX)=0x%x\n", instance->reg_base,
  87                    instance->port_reg - instance->reg_base, 0);
  88         spin_unlock(&instance->subdevice_lock);
  89
  90         ME_SUBDEVICE_EXIT;
  91
  92         return ME_ERRNO_SUCCESS;
  93 }
  94
  95 static int me8100_do_io_single_config(me_subdevice_t * subdevice,
  96                                       struct file *filep,
  97                                       int channel,
  98                                       int single_config,
  99                                       int ref,
 100                                       int trig_chan,
 101                                       int trig_type, int trig_edge, int flags)
 102 {
 103         me8100_do_subdevice_t *instance;
 104         int err = ME_ERRNO_SUCCESS;
 105         int config;
 106
 107         PDEBUG("executed.\n");
 108
 109         instance = (me8100_do_subdevice_t *) subdevice;
 110
 111         ME_SUBDEVICE_ENTER;
 112
 113         spin_lock(&instance->subdevice_lock);
 114         spin_lock(instance->ctrl_reg_lock);
 115         config = inw(instance->ctrl_reg);
 116         switch (flags) {
 117         case ME_IO_SINGLE_CONFIG_NO_FLAGS:
 118         case ME_IO_SINGLE_CONFIG_DIO_WORD:
 119                 if (channel == 0) {
 120                         if (single_config ==
 121                             ME_SINGLE_CONFIG_DIO_HIGH_IMPEDANCE) {
 122                                 config &= ~(ME8100_DIO_CTRL_BIT_ENABLE_DIO);
 123                         } else if (single_config == ME_SINGLE_CONFIG_DIO_SINK) {
 124                                 config |= ME8100_DIO_CTRL_BIT_ENABLE_DIO;
 125                                 config &= ~ME8100_DIO_CTRL_BIT_SOURCE;
 126                         } else if (single_config == ME_SINGLE_CONFIG_DIO_SOURCE) {
 127                                 config |=
 128                                     ME8100_DIO_CTRL_BIT_ENABLE_DIO |
 129                                     ME8100_DIO_CTRL_BIT_SOURCE;
 130                         } else {
 131                                 PERROR
 132                                     ("Invalid port configuration specified.\n");
 133                                 err = ME_ERRNO_INVALID_SINGLE_CONFIG;
 134                         }
 135                 } else {
 136                         PERROR("Invalid word number specified.\n");
 137                         err = ME_ERRNO_INVALID_CHANNEL;
 138                 }
 139                 break;
 140
 141         default:
 142                 PERROR("Invalid flags specified.\n");
 143                 err = ME_ERRNO_INVALID_FLAGS;
 144         }
 145
 146         if (!err) {
 147                 outw(config, instance->ctrl_reg);
 148                 PDEBUG_REG("ctrl_reg outw(0x%lX+0x%lX)=0x%x\n",
 149                            instance->reg_base,
 150                            instance->ctrl_reg - instance->reg_base, config);
 151         }
 152
 153         spin_unlock(instance->ctrl_reg_lock);
 154         spin_unlock(&instance->subdevice_lock);
 155
 156         ME_SUBDEVICE_EXIT;
 157
 158         return err;
 159 }
 160
 161 static int me8100_do_io_single_read(me_subdevice_t * subdevice,
 162                                     struct file *filep,
 163                                     int channel,
 164                                     int *value, int time_out, int flags)
 165 {
 166         me8100_do_subdevice_t *instance;
 167         int err = ME_ERRNO_SUCCESS;
 168
 169         PDEBUG("executed.\n");
 170
 171         instance = (me8100_do_subdevice_t *) subdevice;
 172
 173         ME_SUBDEVICE_ENTER;
 174
 175         spin_lock(&instance->subdevice_lock);
 176         switch (flags) {
 177         case ME_IO_SINGLE_TYPE_DIO_BIT:
 178                 if ((channel >= 0) && (channel < 16)) {
 179                         *value = instance->port_reg_mirror & (0x1 << channel);
 180                 } else {
 181                         PERROR("Invalid bit number specified.\n");
 182                         err = ME_ERRNO_INVALID_CHANNEL;
 183                 }
 184                 break;
 185
 186         case ME_IO_SINGLE_TYPE_DIO_BYTE:
 187                 if (channel == 0) {
 188                         *value = instance->port_reg_mirror & 0xFF;
 189                 } else if (channel == 1) {
 190                         *value = (instance->port_reg_mirror >> 8) & 0xFF;
 191                 } else {
 192                         PERROR("Invalid byte number specified.\n");
 193                         err = ME_ERRNO_INVALID_CHANNEL;
 194                 }
 195                 break;
 196
 197         case ME_IO_SINGLE_NO_FLAGS:
 198         case ME_IO_SINGLE_TYPE_DIO_WORD:
 199                 if (channel == 0) {
 200                         *value = instance->port_reg_mirror;
 201                 } else {
 202                         PERROR("Invalid word number specified.\n");
 203                         err = ME_ERRNO_INVALID_CHANNEL;
 204                 }
 205                 break;
 206
 207         default:
 208                 PERROR("Invalid flags specified.\n");
 209                 err = ME_ERRNO_INVALID_FLAGS;
 210         }
 211         spin_unlock(&instance->subdevice_lock);
 212
 213         ME_SUBDEVICE_EXIT;
 214
 215         return err;
 216 }
 217
 218 static int me8100_do_io_single_write(me_subdevice_t * subdevice,
 219                                      struct file *filep,
 220                                      int channel,
 221                                      int value, int time_out, int flags)
 222 {
 223         me8100_do_subdevice_t *instance;
 224         int err = ME_ERRNO_SUCCESS;
 225
 226         PDEBUG("executed.\n");
 227
 228         instance = (me8100_do_subdevice_t *) subdevice;
 229
 230         ME_SUBDEVICE_ENTER;
 231
 232         spin_lock(&instance->subdevice_lock);
 233         switch (flags) {
 234         case ME_IO_SINGLE_TYPE_DIO_BIT:
 235                 if ((channel >= 0) && (channel < 16)) {
 236                         instance->port_reg_mirror =
 237                             value ? (instance->
 238                                      port_reg_mirror | (0x1 << channel))
 239                             : (instance->port_reg_mirror & ~(0x1 << channel));
 240                         outw(instance->port_reg_mirror, instance->port_reg);
 241                         PDEBUG_REG("port_reg outw(0x%lX+0x%lX)=0x%x\n",
 242                                    instance->reg_base,
 243                                    instance->port_reg - instance->reg_base,
 244                                    instance->port_reg_mirror);
 245                 } else {
 246                         PERROR("Invalid bit number specified.\n");
 247                         err = ME_ERRNO_INVALID_CHANNEL;
 248                 }
 249                 break;
 250
 251         case ME_IO_SINGLE_TYPE_DIO_BYTE:
 252                 if (channel == 0) {
 253                         instance->port_reg_mirror &= ~0xFF;
 254                         instance->port_reg_mirror |= value & 0xFF;
 255                         outw(instance->port_reg_mirror, instance->port_reg);
 256                         PDEBUG_REG("port_reg outw(0x%lX+0x%lX)=0x%x\n",
 257                                    instance->reg_base,
 258                                    instance->port_reg - instance->reg_base,
 259                                    instance->port_reg_mirror);
 260                 } else if (channel == 1) {
 261                         instance->port_reg_mirror &= ~0xFF00;
 262                         instance->port_reg_mirror |= (value << 8) & 0xFF00;
 263                         outw(instance->port_reg_mirror, instance->port_reg);
 264                         PDEBUG_REG("port_reg outw(0x%lX+0x%lX)=0x%x\n",
 265                                    instance->reg_base,
 266                                    instance->port_reg - instance->reg_base,
 267                                    instance->port_reg_mirror);
 268                 } else {
 269                         PERROR("Invalid byte number specified.\n");
 270                         err = ME_ERRNO_INVALID_CHANNEL;
 271                 }
 272                 break;
 273
 274         case ME_IO_SINGLE_NO_FLAGS:
 275         case ME_IO_SINGLE_TYPE_DIO_WORD:
 276                 if (channel == 0) {
 277                         instance->port_reg_mirror = value;
 278                         outw(value, instance->port_reg);
 279                         PDEBUG_REG("port_reg outw(0x%lX+0x%lX)=0x%x\n",
 280                                    instance->reg_base,
 281                                    instance->port_reg - instance->reg_base,
 282                                    value);
 283                 } else {
 284                         PERROR("Invalid byte number specified.\n");
 285                         err = ME_ERRNO_INVALID_CHANNEL;
 286                 }
 287                 break;
 288
 289         default:
 290                 PERROR("Invalid flags specified.\n");
 291                 err = ME_ERRNO_INVALID_FLAGS;
 292         }
 293         spin_unlock(&instance->subdevice_lock);
 294
 295         ME_SUBDEVICE_EXIT;
 296
 297         return err;
 298 }
 299
 300 static int me8100_do_query_number_channels(me_subdevice_t * subdevice,
 301                                            int *number)
 302 {
 303         PDEBUG("executed.\n");
 304         *number = 16;
 305         return ME_ERRNO_SUCCESS;
 306 }
 307
 308 static int me8100_do_query_subdevice_type(me_subdevice_t * subdevice,
 309                                           int *type, int *subtype)
 310 {
 311         PDEBUG("executed.\n");
 312         *type = ME_TYPE_DO;
 313         *subtype = ME_SUBTYPE_SINGLE;
 314         return ME_ERRNO_SUCCESS;
 315 }
 316
 317 static int me8100_do_query_subdevice_caps(me_subdevice_t * subdevice, int *caps)
 318 {
 319         PDEBUG("executed.\n");
 320         *caps = ME_CAPS_DIO_SINK_SOURCE;
 321         return ME_ERRNO_SUCCESS;
 322 }
 323
 324 me8100_do_subdevice_t *me8100_do_constructor(uint32_t reg_base,
 325                                              unsigned int do_idx,
 326                                              spinlock_t * ctrl_reg_lock)
 327 {
 328         me8100_do_subdevice_t *subdevice;
 329         int err;
 330
 331         PDEBUG("executed.\n");
 332
 333         /* Allocate memory for subdevice instance */
 334         subdevice = kmalloc(sizeof(me8100_do_subdevice_t), GFP_KERNEL);
 335
 336         if (!subdevice) {
 337                 PERROR("Cannot get memory for subdevice instance.\n");
 338                 return NULL;
 339         }
 340
 341         memset(subdevice, 0, sizeof(me8100_do_subdevice_t));
 342
 343         /* Initialize subdevice base class */
 344         err = me_subdevice_init(&subdevice->base);
 345
 346         if (err) {
 347                 PERROR("Cannot initialize subdevice base class instance.\n");
 348                 kfree(subdevice);
 349                 return NULL;
 350         }
 351
 352         /* Initialize registers */
 353         if (do_idx == 0) {
 354                 subdevice->port_reg = reg_base + ME8100_DO_REG_A;
 355                 subdevice->ctrl_reg = reg_base + ME8100_CTRL_REG_A;
 356         } else if (do_idx == 1) {
 357                 subdevice->port_reg = reg_base + ME8100_DO_REG_B;
 358                 subdevice->ctrl_reg = reg_base + ME8100_CTRL_REG_B;
 359         } else {
 360                 PERROR("Wrong subdevice idx=%d.\n", do_idx);
 361                 kfree(subdevice);
 362                 return NULL;
 363         }
 364 #ifdef MEDEBUG_DEBUG_REG
 365         subdevice->reg_base = reg_base;
 366 #endif
 367
 368         // Initialize spin locks.
 369         spin_lock_init(&subdevice->subdevice_lock);
 370         subdevice->ctrl_reg_lock = ctrl_reg_lock;
 371
 372         /* Save the subdevice index */
 373         subdevice->do_idx = do_idx;
 374
 375         /* Overload base class methods. */
 376         subdevice->base.me_subdevice_io_reset_subdevice =
 377             me8100_do_io_reset_subdevice;
 378         subdevice->base.me_subdevice_io_single_config =
 379             me8100_do_io_single_config;
 380         subdevice->base.me_subdevice_io_single_read = me8100_do_io_single_read;
 381         subdevice->base.me_subdevice_io_single_write =
 382             me8100_do_io_single_write;
 383         subdevice->base.me_subdevice_query_number_channels =
 384             me8100_do_query_number_channels;
 385         subdevice->base.me_subdevice_query_subdevice_type =
 386             me8100_do_query_subdevice_type;
 387         subdevice->base.me_subdevice_query_subdevice_caps =
 388             me8100_do_query_subdevice_caps;
 389
 390         return subdevice;
 391 }