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 - 2006, 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
 218                 /* Disable all GPEs in this register */
 219
 220                 status = acpi_hw_low_level_write(8, 0x00,
 221                                                  &gpe_block->register_info[i].
 222                                                  enable_address);
 223                 if (ACPI_FAILURE(status)) {
 224                         return (status);
 225                 }
 226         }
 227
 228         return (AE_OK);
 229 }
 230
 231 /******************************************************************************
 232  *
 233  * FUNCTION:    acpi_hw_clear_gpe_block
 234  *
 235  * PARAMETERS:  gpe_xrupt_info      - GPE Interrupt info
 236  *              gpe_block           - Gpe Block info
 237  *
 238  * RETURN:      Status
 239  *
 240  * DESCRIPTION: Clear status bits for all GPEs within a single GPE block
 241  *
 242  ******************************************************************************/
 243
 244 acpi_status
 245 acpi_hw_clear_gpe_block(struct acpi_gpe_xrupt_info * gpe_xrupt_info,
 246                         struct acpi_gpe_block_info * gpe_block)
 247 {
 248         u32 i;
 249         acpi_status status;
 250
 251         /* Examine each GPE Register within the block */
 252
 253         for (i = 0; i < gpe_block->register_count; i++) {
 254
 255                 /* Clear status on all GPEs in this register */
 256
 257                 status = acpi_hw_low_level_write(8, 0xFF,
 258                                                  &gpe_block->register_info[i].
 259                                                  status_address);
 260                 if (ACPI_FAILURE(status)) {
 261                         return (status);
 262                 }
 263         }
 264
 265         return (AE_OK);
 266 }
 267
 268 /******************************************************************************
 269  *
 270  * FUNCTION:    acpi_hw_enable_runtime_gpe_block
 271  *
 272  * PARAMETERS:  gpe_xrupt_info      - GPE Interrupt info
 273  *              gpe_block           - Gpe Block info
 274  *
 275  * RETURN:      Status
 276  *
 277  * DESCRIPTION: Enable all "runtime" GPEs within a single GPE block. Includes
 278  *              combination wake/run GPEs.
 279  *
 280  ******************************************************************************/
 281
 282 acpi_status
 283 acpi_hw_enable_runtime_gpe_block(struct acpi_gpe_xrupt_info * gpe_xrupt_info,
 284                                  struct acpi_gpe_block_info * gpe_block)
 285 {
 286         u32 i;
 287         acpi_status status;
 288
 289         /* NOTE: assumes that all GPEs are currently disabled */
 290
 291         /* Examine each GPE Register within the block */
 292
 293         for (i = 0; i < gpe_block->register_count; i++) {
 294                 if (!gpe_block->register_info[i].enable_for_run) {
 295                         continue;
 296                 }
 297
 298                 /* Enable all "runtime" GPEs in this register */
 299
 300                 status =
 301                     acpi_hw_low_level_write(8,
 302                                             gpe_block->register_info[i].
 303                                             enable_for_run,
 304                                             &gpe_block->register_info[i].
 305                                             enable_address);
 306                 if (ACPI_FAILURE(status)) {
 307                         return (status);
 308                 }
 309         }
 310
 311         return (AE_OK);
 312 }
 313
 314 /******************************************************************************
 315  *
 316  * FUNCTION:    acpi_hw_enable_wakeup_gpe_block
 317  *
 318  * PARAMETERS:  gpe_xrupt_info      - GPE Interrupt info
 319  *              gpe_block           - Gpe Block info
 320  *
 321  * RETURN:      Status
 322  *
 323  * DESCRIPTION: Enable all "wake" GPEs within a single GPE block. Includes
 324  *              combination wake/run GPEs.
 325  *
 326  ******************************************************************************/
 327
 328 static acpi_status
 329 acpi_hw_enable_wakeup_gpe_block(struct acpi_gpe_xrupt_info *gpe_xrupt_info,
 330                                 struct acpi_gpe_block_info *gpe_block)
 331 {
 332         u32 i;
 333         acpi_status status;
 334
 335         /* Examine each GPE Register within the block */
 336
 337         for (i = 0; i < gpe_block->register_count; i++) {
 338                 if (!gpe_block->register_info[i].enable_for_wake) {
 339                         continue;
 340                 }
 341
 342                 /* Enable all "wake" GPEs in this register */
 343
 344                 status = acpi_hw_low_level_write(8,
 345                                                  gpe_block->register_info[i].
 346                                                  enable_for_wake,
 347                                                  &gpe_block->register_info[i].
 348                                                  enable_address);
 349                 if (ACPI_FAILURE(status)) {
 350                         return (status);
 351                 }
 352         }
 353
 354         return (AE_OK);
 355 }
 356
 357 /******************************************************************************
 358  *
 359  * FUNCTION:    acpi_hw_disable_all_gpes
 360  *
 361  * PARAMETERS:  None
 362  *
 363  * RETURN:      Status
 364  *
 365  * DESCRIPTION: Disable and clear all GPEs in all GPE blocks
 366  *
 367  ******************************************************************************/
 368
 369 acpi_status acpi_hw_disable_all_gpes(void)
 370 {
 371         acpi_status status;
 372
 373         ACPI_FUNCTION_TRACE(hw_disable_all_gpes);
 374
 375         status = acpi_ev_walk_gpe_list(acpi_hw_disable_gpe_block);
 376         status = acpi_ev_walk_gpe_list(acpi_hw_clear_gpe_block);
 377         return_ACPI_STATUS(status);
 378 }
 379
 380 /******************************************************************************
 381  *
 382  * FUNCTION:    acpi_hw_enable_all_runtime_gpes
 383  *
 384  * PARAMETERS:  None
 385  *
 386  * RETURN:      Status
 387  *
 388  * DESCRIPTION: Enable all "runtime" GPEs, in all GPE blocks
 389  *
 390  ******************************************************************************/
 391
 392 acpi_status acpi_hw_enable_all_runtime_gpes(void)
 393 {
 394         acpi_status status;
 395
 396         ACPI_FUNCTION_TRACE(hw_enable_all_runtime_gpes);
 397
 398         status = acpi_ev_walk_gpe_list(acpi_hw_enable_runtime_gpe_block);
 399         return_ACPI_STATUS(status);
 400 }
 401
 402 /******************************************************************************
 403  *
 404  * FUNCTION:    acpi_hw_enable_all_wakeup_gpes
 405  *
 406  * PARAMETERS:  None
 407  *
 408  * RETURN:      Status
 409  *
 410  * DESCRIPTION: Enable all "wakeup" GPEs, in all GPE blocks
 411  *
 412  ******************************************************************************/
 413
 414 acpi_status acpi_hw_enable_all_wakeup_gpes(void)
 415 {
 416         acpi_status status;
 417
 418         ACPI_FUNCTION_TRACE(hw_enable_all_wakeup_gpes);
 419
 420         status = acpi_ev_walk_gpe_list(acpi_hw_enable_wakeup_gpe_block);
 421         return_ACPI_STATUS(status);
 422 }