git.oblomov.eu Git - linux-2.6/blob - drivers/acpi/hardware/hwgpe.c

   1
   2 /******************************************************************************
   3  *
   4  * Module Name: hwgpe - Low level GPE enable/disable/clear functions
   5  *
   6  *****************************************************************************/
   7
   8 /*
   9  * Copyright (C) 2000 - 2005, R. Byron Moore
  10  * All rights reserved.
  11  *
  12  * Redistribution and use in source and binary forms, with or without
  13  * modification, are permitted provided that the following conditions
  14  * are met:
  15  * 1. Redistributions of source code must retain the above copyright
  16  *    notice, this list of conditions, and the following disclaimer,
  17  *    without modification.
  18  * 2. Redistributions in binary form must reproduce at minimum a disclaimer
  19  *    substantially similar to the "NO WARRANTY" disclaimer below
  20  *    ("Disclaimer") and any redistribution must be conditioned upon
  21  *    including a substantially similar Disclaimer requirement for further
  22  *    binary redistribution.
  23  * 3. Neither the names of the above-listed copyright holders nor the names
  24  *    of any contributors may be used to endorse or promote products derived
  25  *    from this software without specific prior written permission.
  26  *
  27  * Alternatively, this software may be distributed under the terms of the
  28  * GNU General Public License ("GPL") version 2 as published by the Free
  29  * Software Foundation.
  30  *
  31  * NO WARRANTY
  32  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
  33  * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
  34  * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR
  35  * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
  36  * HOLDERS OR CONTRIBUTORS BE LIABLE FOR SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  37  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  38  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  39  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
  40  * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
  41  * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
  42  * POSSIBILITY OF SUCH DAMAGES.
  43  */
  44
  45 #include <acpi/acpi.h>
  46 #include <acpi/acevents.h>
  47
  48 #define _COMPONENT          ACPI_HARDWARE
  49 ACPI_MODULE_NAME("hwgpe")
  50
  51 /* Local prototypes */
  52 static acpi_status
  53 acpi_hw_enable_wakeup_gpe_block(struct acpi_gpe_xrupt_info *gpe_xrupt_info,
  54                                 struct acpi_gpe_block_info *gpe_block);
  55
  56 /******************************************************************************
  57  *
  58  * FUNCTION:    acpi_hw_write_gpe_enable_reg
  59  *
  60  * PARAMETERS:  gpe_event_info      - Info block for the GPE to be enabled
  61  *
  62  * RETURN:      Status
  63  *
  64  * DESCRIPTION: Write a GPE enable register.  Note: The bit for this GPE must
  65  *              already be cleared or set in the parent register
  66  *              enable_for_run mask.
  67  *
  68  ******************************************************************************/
  69
  70 acpi_status
  71 acpi_hw_write_gpe_enable_reg(struct acpi_gpe_event_info *gpe_event_info)
  72 {
  73         struct acpi_gpe_register_info *gpe_register_info;
  74         acpi_status status;
  75
  76         ACPI_FUNCTION_ENTRY();
  77
  78         /* Get the info block for the entire GPE register */
  79
  80         gpe_register_info = gpe_event_info->register_info;
  81         if (!gpe_register_info) {
  82                 return (AE_NOT_EXIST);
  83         }
  84
  85         /* Write the entire GPE (runtime) enable register */
  86
  87         status = acpi_hw_low_level_write(8, gpe_register_info->enable_for_run,
  88                                          &gpe_register_info->enable_address);
  89
  90         return (status);
  91 }
  92
  93 /******************************************************************************
  94  *
  95  * FUNCTION:    acpi_hw_clear_gpe
  96  *
  97  * PARAMETERS:  gpe_event_info      - Info block for the GPE to be cleared
  98  *
  99  * RETURN:      Status
 100  *
 101  * DESCRIPTION: Clear the status bit for a single GPE.
 102  *
 103  ******************************************************************************/
 104
 105 acpi_status acpi_hw_clear_gpe(struct acpi_gpe_event_info * gpe_event_info)
 106 {
 107         acpi_status status;
 108
 109         ACPI_FUNCTION_ENTRY();
 110
 111         /*
 112          * Write a one to the appropriate bit in the status register to
 113          * clear this GPE.
 114          */
 115         status = acpi_hw_low_level_write(8, gpe_event_info->register_bit,
 116                                          &gpe_event_info->register_info->
 117                                          status_address);
 118
 119         return (status);
 120 }
 121
 122 /******************************************************************************
 123  *
 124  * FUNCTION:    acpi_hw_get_gpe_status
 125  *
 126  * PARAMETERS:  gpe_event_info      - Info block for the GPE to queried
 127  *              event_status        - Where the GPE status is returned
 128  *
 129  * RETURN:      Status
 130  *
 131  * DESCRIPTION: Return the status of a single GPE.
 132  *
 133  ******************************************************************************/
 134
 135 #ifdef ACPI_FUTURE_USAGE
 136 acpi_status
 137 acpi_hw_get_gpe_status(struct acpi_gpe_event_info * gpe_event_info,
 138                        acpi_event_status * event_status)
 139 {
 140         u32 in_byte;
 141         u8 register_bit;
 142         struct acpi_gpe_register_info *gpe_register_info;
 143         acpi_status status;
 144         acpi_event_status local_event_status = 0;
 145
 146         ACPI_FUNCTION_ENTRY();
 147
 148         if (!event_status) {
 149                 return (AE_BAD_PARAMETER);
 150         }
 151
 152         /* Get the info block for the entire GPE register */
 153
 154         gpe_register_info = gpe_event_info->register_info;
 155
 156         /* Get the register bitmask for this GPE */
 157
 158         register_bit = gpe_event_info->register_bit;
 159
 160         /* GPE currently enabled? (enabled for runtime?) */
 161
 162         if (register_bit & gpe_register_info->enable_for_run) {
 163                 local_event_status |= ACPI_EVENT_FLAG_ENABLED;
 164         }
 165
 166         /* GPE enabled for wake? */
 167
 168         if (register_bit & gpe_register_info->enable_for_wake) {
 169                 local_event_status |= ACPI_EVENT_FLAG_WAKE_ENABLED;
 170         }
 171
 172         /* GPE currently active (status bit == 1)? */
 173
 174         status =
 175             acpi_hw_low_level_read(8, &in_byte,
 176                                    &gpe_register_info->status_address);
 177         if (ACPI_FAILURE(status)) {
 178                 goto unlock_and_exit;
 179         }
 180
 181         if (register_bit & in_byte) {
 182                 local_event_status |= ACPI_EVENT_FLAG_SET;
 183         }
 184
 185         /* Set return value */
 186
 187         (*event_status) = local_event_status;
 188
 189       unlock_and_exit:
 190         return (status);
 191 }
 192 #endif                          /*  ACPI_FUTURE_USAGE  */
 193
 194 /******************************************************************************
 195  *
 196  * FUNCTION:    acpi_hw_disable_gpe_block
 197  *
 198  * PARAMETERS:  gpe_xrupt_info      - GPE Interrupt info
 199  *              gpe_block           - Gpe Block info
 200  *
 201  * RETURN:      Status
 202  *
 203  * DESCRIPTION: Disable all GPEs within a single GPE block
 204  *
 205  ******************************************************************************/
 206
 207 acpi_status
 208 acpi_hw_disable_gpe_block(struct acpi_gpe_xrupt_info * gpe_xrupt_info,
 209                           struct acpi_gpe_block_info * gpe_block)
 210 {
 211         u32 i;
 212         acpi_status status;
 213
 214         /* Examine each GPE Register within the block */
 215
 216         for (i = 0; i < gpe_block->register_count; i++) {
 217                 /* Disable all GPEs in this register */
 218
 219                 status = acpi_hw_low_level_write(8, 0x00,
 220                                                  &gpe_block->register_info[i].
 221                                                  enable_address);
 222                 if (ACPI_FAILURE(status)) {
 223                         return (status);
 224                 }
 225         }
 226
 227         return (AE_OK);
 228 }
 229
 230 /******************************************************************************
 231  *
 232  * FUNCTION:    acpi_hw_clear_gpe_block
 233  *
 234  * PARAMETERS:  gpe_xrupt_info      - GPE Interrupt info
 235  *              gpe_block           - Gpe Block info
 236  *
 237  * RETURN:      Status
 238  *
 239  * DESCRIPTION: Clear status bits for all GPEs within a single GPE block
 240  *
 241  ******************************************************************************/
 242
 243 acpi_status
 244 acpi_hw_clear_gpe_block(struct acpi_gpe_xrupt_info * gpe_xrupt_info,
 245                         struct acpi_gpe_block_info * gpe_block)
 246 {
 247         u32 i;
 248         acpi_status status;
 249
 250         /* Examine each GPE Register within the block */
 251
 252         for (i = 0; i < gpe_block->register_count; i++) {
 253                 /* Clear status on all GPEs in this register */
 254
 255                 status = acpi_hw_low_level_write(8, 0xFF,
 256                                                  &gpe_block->register_info[i].
 257                                                  status_address);
 258                 if (ACPI_FAILURE(status)) {
 259                         return (status);
 260                 }
 261         }
 262
 263         return (AE_OK);
 264 }
 265
 266 /******************************************************************************
 267  *
 268  * FUNCTION:    acpi_hw_enable_runtime_gpe_block
 269  *
 270  * PARAMETERS:  gpe_xrupt_info      - GPE Interrupt info
 271  *              gpe_block           - Gpe Block info
 272  *
 273  * RETURN:      Status
 274  *
 275  * DESCRIPTION: Enable all "runtime" GPEs within a single GPE block. Includes
 276  *              combination wake/run GPEs.
 277  *
 278  ******************************************************************************/
 279
 280 acpi_status
 281 acpi_hw_enable_runtime_gpe_block(struct acpi_gpe_xrupt_info * gpe_xrupt_info,
 282                                  struct acpi_gpe_block_info * gpe_block)
 283 {
 284         u32 i;
 285         acpi_status status;
 286
 287         /* NOTE: assumes that all GPEs are currently disabled */
 288
 289         /* Examine each GPE Register within the block */
 290
 291         for (i = 0; i < gpe_block->register_count; i++) {
 292                 if (!gpe_block->register_info[i].enable_for_run) {
 293                         continue;
 294                 }
 295
 296                 /* Enable all "runtime" GPEs in this register */
 297
 298                 status =
 299                     acpi_hw_low_level_write(8,
 300                                             gpe_block->register_info[i].
 301                                             enable_for_run,
 302                                             &gpe_block->register_info[i].
 303                                             enable_address);
 304                 if (ACPI_FAILURE(status)) {
 305                         return (status);
 306                 }
 307         }
 308
 309         return (AE_OK);
 310 }
 311
 312 /******************************************************************************
 313  *
 314  * FUNCTION:    acpi_hw_enable_wakeup_gpe_block
 315  *
 316  * PARAMETERS:  gpe_xrupt_info      - GPE Interrupt info
 317  *              gpe_block           - Gpe Block info
 318  *
 319  * RETURN:      Status
 320  *
 321  * DESCRIPTION: Enable all "wake" GPEs within a single GPE block. Includes
 322  *              combination wake/run GPEs.
 323  *
 324  ******************************************************************************/
 325
 326 static acpi_status
 327 acpi_hw_enable_wakeup_gpe_block(struct acpi_gpe_xrupt_info *gpe_xrupt_info,
 328                                 struct acpi_gpe_block_info *gpe_block)
 329 {
 330         u32 i;
 331         acpi_status status;
 332
 333         /* Examine each GPE Register within the block */
 334
 335         for (i = 0; i < gpe_block->register_count; i++) {
 336                 if (!gpe_block->register_info[i].enable_for_wake) {
 337                         continue;
 338                 }
 339
 340                 /* Enable all "wake" GPEs in this register */
 341
 342                 status = acpi_hw_low_level_write(8,
 343                                                  gpe_block->register_info[i].
 344                                                  enable_for_wake,
 345                                                  &gpe_block->register_info[i].
 346                                                  enable_address);
 347                 if (ACPI_FAILURE(status)) {
 348                         return (status);
 349                 }
 350         }
 351
 352         return (AE_OK);
 353 }
 354
 355 /******************************************************************************
 356  *
 357  * FUNCTION:    acpi_hw_disable_all_gpes
 358  *
 359  * PARAMETERS:  None
 360  *
 361  * RETURN:      Status
 362  *
 363  * DESCRIPTION: Disable and clear all GPEs in all GPE blocks
 364  *
 365  ******************************************************************************/
 366
 367 acpi_status acpi_hw_disable_all_gpes(void)
 368 {
 369         acpi_status status;
 370
 371         ACPI_FUNCTION_TRACE("hw_disable_all_gpes");
 372
 373         status = acpi_ev_walk_gpe_list(acpi_hw_disable_gpe_block);
 374         status = acpi_ev_walk_gpe_list(acpi_hw_clear_gpe_block);
 375         return_ACPI_STATUS(status);
 376 }
 377
 378 /******************************************************************************
 379  *
 380  * FUNCTION:    acpi_hw_enable_all_runtime_gpes
 381  *
 382  * PARAMETERS:  None
 383  *
 384  * RETURN:      Status
 385  *
 386  * DESCRIPTION: Enable all "runtime" GPEs, in all GPE blocks
 387  *
 388  ******************************************************************************/
 389
 390 acpi_status acpi_hw_enable_all_runtime_gpes(void)
 391 {
 392         acpi_status status;
 393
 394         ACPI_FUNCTION_TRACE("hw_enable_all_runtime_gpes");
 395
 396         status = acpi_ev_walk_gpe_list(acpi_hw_enable_runtime_gpe_block);
 397         return_ACPI_STATUS(status);
 398 }
 399
 400 /******************************************************************************
 401  *
 402  * FUNCTION:    acpi_hw_enable_all_wakeup_gpes
 403  *
 404  * PARAMETERS:  None
 405  *
 406  * RETURN:      Status
 407  *
 408  * DESCRIPTION: Enable all "wakeup" GPEs, in all GPE blocks
 409  *
 410  ******************************************************************************/
 411
 412 acpi_status acpi_hw_enable_all_wakeup_gpes(void)
 413 {
 414         acpi_status status;
 415
 416         ACPI_FUNCTION_TRACE("hw_enable_all_wakeup_gpes");
 417
 418         status = acpi_ev_walk_gpe_list(acpi_hw_enable_wakeup_gpe_block);
 419         return_ACPI_STATUS(status);
 420 }