drivers/acpi/acpica/evxfevnt.c

   1 /******************************************************************************
   2  *
   3  * Module Name: evxfevnt - External Interfaces, ACPI event disable/enable
   4  *
   5  *****************************************************************************/
   6
   7 /*
   8  * Copyright (C) 2000 - 2010, Intel Corp.
   9  * All rights reserved.
  10  *
  11  * Redistribution and use in source and binary forms, with or without
  12  * modification, are permitted provided that the following conditions
  13  * are met:
  14  * 1. Redistributions of source code must retain the above copyright
  15  *    notice, this list of conditions, and the following disclaimer,
  16  *    without modification.
  17  * 2. Redistributions in binary form must reproduce at minimum a disclaimer
  18  *    substantially similar to the "NO WARRANTY" disclaimer below
  19  *    ("Disclaimer") and any redistribution must be conditioned upon
  20  *    including a substantially similar Disclaimer requirement for further
  21  *    binary redistribution.
  22  * 3. Neither the names of the above-listed copyright holders nor the names
  23  *    of any contributors may be used to endorse or promote products derived
  24  *    from this software without specific prior written permission.
  25  *
  26  * Alternatively, this software may be distributed under the terms of the
  27  * GNU General Public License ("GPL") version 2 as published by the Free
  28  * Software Foundation.
  29  *
  30  * NO WARRANTY
  31  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
  32  * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
  33  * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR
  34  * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
  35  * HOLDERS OR CONTRIBUTORS BE LIABLE FOR SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  36  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  37  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  38  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
  39  * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
  40  * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
  41  * POSSIBILITY OF SUCH DAMAGES.
  42  */
  43
  44 #include <acpi/acpi.h>
  45 #include "accommon.h"
  46 #include "acevents.h"
  47 #include "acnamesp.h"
  48 #include "actables.h"
  49
  50 #define _COMPONENT          ACPI_EVENTS
  51 ACPI_MODULE_NAME("evxfevnt")
  52
  53 /* Local prototypes */
  54 static acpi_status
  55 acpi_ev_get_gpe_device(struct acpi_gpe_xrupt_info *gpe_xrupt_info,
  56                        struct acpi_gpe_block_info *gpe_block, void *context);
  57
  58 /*******************************************************************************
  59  *
  60  * FUNCTION:    acpi_enable
  61  *
  62  * PARAMETERS:  None
  63  *
  64  * RETURN:      Status
  65  *
  66  * DESCRIPTION: Transfers the system into ACPI mode.
  67  *
  68  ******************************************************************************/
  69
  70 acpi_status acpi_enable(void)
  71 {
  72         acpi_status status = AE_OK;
  73
  74         ACPI_FUNCTION_TRACE(acpi_enable);
  75
  76         /* ACPI tables must be present */
  77
  78         if (!acpi_tb_tables_loaded()) {
  79                 return_ACPI_STATUS(AE_NO_ACPI_TABLES);
  80         }
  81
  82         /* Check current mode */
  83
  84         if (acpi_hw_get_mode() == ACPI_SYS_MODE_ACPI) {
  85                 ACPI_DEBUG_PRINT((ACPI_DB_INIT,
  86                                   "System is already in ACPI mode\n"));
  87         } else {
  88                 /* Transition to ACPI mode */
  89
  90                 status = acpi_hw_set_mode(ACPI_SYS_MODE_ACPI);
  91                 if (ACPI_FAILURE(status)) {
  92                         ACPI_ERROR((AE_INFO,
  93                                     "Could not transition to ACPI mode"));
  94                         return_ACPI_STATUS(status);
  95                 }
  96
  97                 ACPI_DEBUG_PRINT((ACPI_DB_INIT,
  98                                   "Transition to ACPI mode successful\n"));
  99         }
 100
 101         return_ACPI_STATUS(status);
 102 }
 103
 104 ACPI_EXPORT_SYMBOL(acpi_enable)
 105
 106 /*******************************************************************************
 107  *
 108  * FUNCTION:    acpi_disable
 109  *
 110  * PARAMETERS:  None
 111  *
 112  * RETURN:      Status
 113  *
 114  * DESCRIPTION: Transfers the system into LEGACY (non-ACPI) mode.
 115  *
 116  ******************************************************************************/
 117 acpi_status acpi_disable(void)
 118 {
 119         acpi_status status = AE_OK;
 120
 121         ACPI_FUNCTION_TRACE(acpi_disable);
 122
 123         if (acpi_hw_get_mode() == ACPI_SYS_MODE_LEGACY) {
 124                 ACPI_DEBUG_PRINT((ACPI_DB_INIT,
 125                                   "System is already in legacy (non-ACPI) mode\n"));
 126         } else {
 127                 /* Transition to LEGACY mode */
 128
 129                 status = acpi_hw_set_mode(ACPI_SYS_MODE_LEGACY);
 130
 131                 if (ACPI_FAILURE(status)) {
 132                         ACPI_ERROR((AE_INFO,
 133                                     "Could not exit ACPI mode to legacy mode"));
 134                         return_ACPI_STATUS(status);
 135                 }
 136
 137                 ACPI_DEBUG_PRINT((ACPI_DB_INIT, "ACPI mode disabled\n"));
 138         }
 139
 140         return_ACPI_STATUS(status);
 141 }
 142
 143 ACPI_EXPORT_SYMBOL(acpi_disable)
 144
 145 /*******************************************************************************
 146  *
 147  * FUNCTION:    acpi_enable_event
 148  *
 149  * PARAMETERS:  Event           - The fixed eventto be enabled
 150  *              Flags           - Reserved
 151  *
 152  * RETURN:      Status
 153  *
 154  * DESCRIPTION: Enable an ACPI event (fixed)
 155  *
 156  ******************************************************************************/
 157 acpi_status acpi_enable_event(u32 event, u32 flags)
 158 {
 159         acpi_status status = AE_OK;
 160         u32 value;
 161
 162         ACPI_FUNCTION_TRACE(acpi_enable_event);
 163
 164         /* Decode the Fixed Event */
 165
 166         if (event > ACPI_EVENT_MAX) {
 167                 return_ACPI_STATUS(AE_BAD_PARAMETER);
 168         }
 169
 170         /*
 171          * Enable the requested fixed event (by writing a one to the enable
 172          * register bit)
 173          */
 174         status =
 175             acpi_write_bit_register(acpi_gbl_fixed_event_info[event].
 176                                     enable_register_id, ACPI_ENABLE_EVENT);
 177         if (ACPI_FAILURE(status)) {
 178                 return_ACPI_STATUS(status);
 179         }
 180
 181         /* Make sure that the hardware responded */
 182
 183         status =
 184             acpi_read_bit_register(acpi_gbl_fixed_event_info[event].
 185                                    enable_register_id, &value);
 186         if (ACPI_FAILURE(status)) {
 187                 return_ACPI_STATUS(status);
 188         }
 189
 190         if (value != 1) {
 191                 ACPI_ERROR((AE_INFO,
 192                             "Could not enable %s event",
 193                             acpi_ut_get_event_name(event)));
 194                 return_ACPI_STATUS(AE_NO_HARDWARE_RESPONSE);
 195         }
 196
 197         return_ACPI_STATUS(status);
 198 }
 199
 200 ACPI_EXPORT_SYMBOL(acpi_enable_event)
 201
 202 /*******************************************************************************
 203  *
 204  * FUNCTION:    acpi_set_gpe
 205  *
 206  * PARAMETERS:  gpe_device      - Parent GPE Device. NULL for GPE0/GPE1
 207  *              gpe_number      - GPE level within the GPE block
 208  *              action          - ACPI_GPE_ENABLE or ACPI_GPE_DISABLE
 209  *
 210  * RETURN:      Status
 211  *
 212  * DESCRIPTION: Enable or disable an individual GPE. This function bypasses
 213  *              the reference count mechanism used in the acpi_enable_gpe and
 214  *              acpi_disable_gpe interfaces -- and should be used with care.
 215  *
 216  * Note: Typically used to disable a runtime GPE for short period of time,
 217  * then re-enable it, without disturbing the existing reference counts. This
 218  * is useful, for example, in the Embedded Controller (EC) driver.
 219  *
 220  ******************************************************************************/
 221 acpi_status acpi_set_gpe(acpi_handle gpe_device, u32 gpe_number, u8 action)
 222 {
 223         struct acpi_gpe_event_info *gpe_event_info;
 224         acpi_status status;
 225         acpi_cpu_flags flags;
 226
 227         ACPI_FUNCTION_TRACE(acpi_set_gpe);
 228
 229         flags = acpi_os_acquire_lock(acpi_gbl_gpe_lock);
 230
 231         /* Ensure that we have a valid GPE number */
 232
 233         gpe_event_info = acpi_ev_get_gpe_event_info(gpe_device, gpe_number);
 234         if (!gpe_event_info) {
 235                 status = AE_BAD_PARAMETER;
 236                 goto unlock_and_exit;
 237         }
 238
 239         /* Perform the action */
 240
 241         switch (action) {
 242         case ACPI_GPE_ENABLE:
 243                 status = acpi_ev_enable_gpe(gpe_event_info);
 244                 break;
 245
 246         case ACPI_GPE_DISABLE:
 247                 status = acpi_ev_disable_gpe(gpe_event_info);
 248                 break;
 249
 250         default:
 251                 status = AE_BAD_PARAMETER;
 252                 break;
 253         }
 254
 255       unlock_and_exit:
 256         acpi_os_release_lock(acpi_gbl_gpe_lock, flags);
 257         return_ACPI_STATUS(status);
 258 }
 259
 260 ACPI_EXPORT_SYMBOL(acpi_set_gpe)
 261
 262 /*******************************************************************************
 263  *
 264  * FUNCTION:    acpi_enable_gpe
 265  *
 266  * PARAMETERS:  gpe_device      - Parent GPE Device. NULL for GPE0/GPE1
 267  *              gpe_number      - GPE level within the GPE block
 268  *              gpe_type        - ACPI_GPE_TYPE_RUNTIME or ACPI_GPE_TYPE_WAKE
 269  *                                or both
 270  *
 271  * RETURN:      Status
 272  *
 273  * DESCRIPTION: Add a reference to a GPE. On the first reference, the GPE is
 274  *              hardware-enabled (for runtime GPEs), or the GPE register mask
 275  *              is updated (for wake GPEs).
 276  *
 277  ******************************************************************************/
 278 acpi_status acpi_enable_gpe(acpi_handle gpe_device, u32 gpe_number, u8 gpe_type)
 279 {
 280         acpi_status status = AE_OK;
 281         struct acpi_gpe_event_info *gpe_event_info;
 282         acpi_cpu_flags flags;
 283
 284         ACPI_FUNCTION_TRACE(acpi_enable_gpe);
 285
 286         /* Parameter validation */
 287
 288         if (!gpe_type || (gpe_type & ~ACPI_GPE_TYPE_WAKE_RUN)) {
 289                 return_ACPI_STATUS(AE_BAD_PARAMETER);
 290         }
 291
 292         flags = acpi_os_acquire_lock(acpi_gbl_gpe_lock);
 293
 294         /* Ensure that we have a valid GPE number */
 295
 296         gpe_event_info = acpi_ev_get_gpe_event_info(gpe_device, gpe_number);
 297         if (!gpe_event_info) {
 298                 status = AE_BAD_PARAMETER;
 299                 goto unlock_and_exit;
 300         }
 301
 302         if (gpe_type & ACPI_GPE_TYPE_RUNTIME) {
 303                 if (gpe_event_info->runtime_count == ACPI_UINT8_MAX) {
 304                         status = AE_LIMIT;      /* Too many references */
 305                         goto unlock_and_exit;
 306                 }
 307
 308                 gpe_event_info->runtime_count++;
 309                 if (gpe_event_info->runtime_count == 1) {
 310                         status = acpi_ev_enable_gpe(gpe_event_info);
 311                         if (ACPI_FAILURE(status)) {
 312                                 gpe_event_info->runtime_count--;
 313                                 goto unlock_and_exit;
 314                         }
 315                 }
 316         }
 317
 318         if (gpe_type & ACPI_GPE_TYPE_WAKE) {
 319                 /* The GPE must have the ability to wake the system */
 320
 321                 if (!(gpe_event_info->flags & ACPI_GPE_CAN_WAKE)) {
 322                         status = AE_TYPE;
 323                         goto unlock_and_exit;
 324                 }
 325
 326                 if (gpe_event_info->wakeup_count == ACPI_UINT8_MAX) {
 327                         status = AE_LIMIT;      /* Too many references */
 328                         goto unlock_and_exit;
 329                 }
 330
 331                 /*
 332                  * Update the enable mask on the first wakeup reference. Wake GPEs
 333                  * are only hardware-enabled just before sleeping.
 334                  */
 335                 gpe_event_info->wakeup_count++;
 336                 if (gpe_event_info->wakeup_count == 1) {
 337                         (void)acpi_ev_update_gpe_enable_masks(gpe_event_info);
 338                 }
 339         }
 340
 341 unlock_and_exit:
 342         acpi_os_release_lock(acpi_gbl_gpe_lock, flags);
 343         return_ACPI_STATUS(status);
 344 }
 345 ACPI_EXPORT_SYMBOL(acpi_enable_gpe)
 346
 347 /*******************************************************************************
 348  *
 349  * FUNCTION:    acpi_disable_gpe
 350  *
 351  * PARAMETERS:  gpe_device      - Parent GPE Device. NULL for GPE0/GPE1
 352  *              gpe_number      - GPE level within the GPE block
 353  *              gpe_type        - ACPI_GPE_TYPE_RUNTIME or ACPI_GPE_TYPE_WAKE
 354  *                                or both
 355  *
 356  * RETURN:      Status
 357  *
 358  * DESCRIPTION: Remove a reference to a GPE. When the last reference is
 359  *              removed, only then is the GPE disabled (for runtime GPEs), or
 360  *              the GPE mask bit disabled (for wake GPEs)
 361  *
 362  ******************************************************************************/
 363 acpi_status acpi_disable_gpe(acpi_handle gpe_device, u32 gpe_number, u8 gpe_type)
 364 {
 365         acpi_status status = AE_OK;
 366         struct acpi_gpe_event_info *gpe_event_info;
 367         acpi_cpu_flags flags;
 368
 369         ACPI_FUNCTION_TRACE(acpi_disable_gpe);
 370
 371         /* Parameter validation */
 372
 373         if (!gpe_type || (gpe_type & ~ACPI_GPE_TYPE_WAKE_RUN)) {
 374                 return_ACPI_STATUS(AE_BAD_PARAMETER);
 375         }
 376
 377         flags = acpi_os_acquire_lock(acpi_gbl_gpe_lock);
 378
 379         /* Ensure that we have a valid GPE number */
 380
 381         gpe_event_info = acpi_ev_get_gpe_event_info(gpe_device, gpe_number);
 382         if (!gpe_event_info) {
 383                 status = AE_BAD_PARAMETER;
 384                 goto unlock_and_exit;
 385         }
 386
 387         /* Hardware-disable a runtime GPE on removal of the last reference */
 388
 389         if (gpe_type & ACPI_GPE_TYPE_RUNTIME) {
 390                 if (!gpe_event_info->runtime_count) {
 391                         status = AE_LIMIT;      /* There are no references to remove */
 392                         goto unlock_and_exit;
 393                 }
 394
 395                 gpe_event_info->runtime_count--;
 396                 if (!gpe_event_info->runtime_count) {
 397                         status = acpi_ev_disable_gpe(gpe_event_info);
 398                         if (ACPI_FAILURE(status)) {
 399                                 gpe_event_info->runtime_count++;
 400                                 goto unlock_and_exit;
 401                         }
 402                 }
 403         }
 404
 405         /*
 406          * Update masks for wake GPE on removal of the last reference.
 407          * No need to hardware-disable wake GPEs here, they are not currently
 408          * enabled.
 409          */
 410         if (gpe_type & ACPI_GPE_TYPE_WAKE) {
 411                 if (!gpe_event_info->wakeup_count) {
 412                         status = AE_LIMIT;      /* There are no references to remove */
 413                         goto unlock_and_exit;
 414                 }
 415
 416                 gpe_event_info->wakeup_count--;
 417                 if (!gpe_event_info->wakeup_count) {
 418                         (void)acpi_ev_update_gpe_enable_masks(gpe_event_info);
 419                 }
 420         }
 421
 422 unlock_and_exit:
 423         acpi_os_release_lock(acpi_gbl_gpe_lock, flags);
 424         return_ACPI_STATUS(status);
 425 }
 426 ACPI_EXPORT_SYMBOL(acpi_disable_gpe)
 427
 428 /*******************************************************************************
 429  *
 430  * FUNCTION:    acpi_disable_event
 431  *
 432  * PARAMETERS:  Event           - The fixed eventto be enabled
 433  *              Flags           - Reserved
 434  *
 435  * RETURN:      Status
 436  *
 437  * DESCRIPTION: Disable an ACPI event (fixed)
 438  *
 439  ******************************************************************************/
 440 acpi_status acpi_disable_event(u32 event, u32 flags)
 441 {
 442         acpi_status status = AE_OK;
 443         u32 value;
 444
 445         ACPI_FUNCTION_TRACE(acpi_disable_event);
 446
 447         /* Decode the Fixed Event */
 448
 449         if (event > ACPI_EVENT_MAX) {
 450                 return_ACPI_STATUS(AE_BAD_PARAMETER);
 451         }
 452
 453         /*
 454          * Disable the requested fixed event (by writing a zero to the enable
 455          * register bit)
 456          */
 457         status =
 458             acpi_write_bit_register(acpi_gbl_fixed_event_info[event].
 459                                     enable_register_id, ACPI_DISABLE_EVENT);
 460         if (ACPI_FAILURE(status)) {
 461                 return_ACPI_STATUS(status);
 462         }
 463
 464         status =
 465             acpi_read_bit_register(acpi_gbl_fixed_event_info[event].
 466                                    enable_register_id, &value);
 467         if (ACPI_FAILURE(status)) {
 468                 return_ACPI_STATUS(status);
 469         }
 470
 471         if (value != 0) {
 472                 ACPI_ERROR((AE_INFO,
 473                             "Could not disable %s events",
 474                             acpi_ut_get_event_name(event)));
 475                 return_ACPI_STATUS(AE_NO_HARDWARE_RESPONSE);
 476         }
 477
 478         return_ACPI_STATUS(status);
 479 }
 480
 481 ACPI_EXPORT_SYMBOL(acpi_disable_event)
 482
 483 /*******************************************************************************
 484  *
 485  * FUNCTION:    acpi_clear_event
 486  *
 487  * PARAMETERS:  Event           - The fixed event to be cleared
 488  *
 489  * RETURN:      Status
 490  *
 491  * DESCRIPTION: Clear an ACPI event (fixed)
 492  *
 493  ******************************************************************************/
 494 acpi_status acpi_clear_event(u32 event)
 495 {
 496         acpi_status status = AE_OK;
 497
 498         ACPI_FUNCTION_TRACE(acpi_clear_event);
 499
 500         /* Decode the Fixed Event */
 501
 502         if (event > ACPI_EVENT_MAX) {
 503                 return_ACPI_STATUS(AE_BAD_PARAMETER);
 504         }
 505
 506         /*
 507          * Clear the requested fixed event (By writing a one to the status
 508          * register bit)
 509          */
 510         status =
 511             acpi_write_bit_register(acpi_gbl_fixed_event_info[event].
 512                                     status_register_id, ACPI_CLEAR_STATUS);
 513
 514         return_ACPI_STATUS(status);
 515 }
 516
 517 ACPI_EXPORT_SYMBOL(acpi_clear_event)
 518
 519 /*******************************************************************************
 520  *
 521  * FUNCTION:    acpi_clear_gpe
 522  *
 523  * PARAMETERS:  gpe_device      - Parent GPE Device. NULL for GPE0/GPE1
 524  *              gpe_number      - GPE level within the GPE block
 525  *
 526  * RETURN:      Status
 527  *
 528  * DESCRIPTION: Clear an ACPI event (general purpose)
 529  *
 530  ******************************************************************************/
 531 acpi_status acpi_clear_gpe(acpi_handle gpe_device, u32 gpe_number)
 532 {
 533         acpi_status status = AE_OK;
 534         struct acpi_gpe_event_info *gpe_event_info;
 535         acpi_cpu_flags flags;
 536
 537         ACPI_FUNCTION_TRACE(acpi_clear_gpe);
 538
 539         flags = acpi_os_acquire_lock(acpi_gbl_gpe_lock);
 540
 541         /* Ensure that we have a valid GPE number */
 542
 543         gpe_event_info = acpi_ev_get_gpe_event_info(gpe_device, gpe_number);
 544         if (!gpe_event_info) {
 545                 status = AE_BAD_PARAMETER;
 546                 goto unlock_and_exit;
 547         }
 548
 549         status = acpi_hw_clear_gpe(gpe_event_info);
 550
 551       unlock_and_exit:
 552         acpi_os_release_lock(acpi_gbl_gpe_lock, flags);
 553         return_ACPI_STATUS(status);
 554 }
 555
 556 ACPI_EXPORT_SYMBOL(acpi_clear_gpe)
 557 /*******************************************************************************
 558  *
 559  * FUNCTION:    acpi_get_event_status
 560  *
 561  * PARAMETERS:  Event           - The fixed event
 562  *              event_status    - Where the current status of the event will
 563  *                                be returned
 564  *
 565  * RETURN:      Status
 566  *
 567  * DESCRIPTION: Obtains and returns the current status of the event
 568  *
 569  ******************************************************************************/
 570 acpi_status acpi_get_event_status(u32 event, acpi_event_status * event_status)
 571 {
 572         acpi_status status = AE_OK;
 573         u32 value;
 574
 575         ACPI_FUNCTION_TRACE(acpi_get_event_status);
 576
 577         if (!event_status) {
 578                 return_ACPI_STATUS(AE_BAD_PARAMETER);
 579         }
 580
 581         /* Decode the Fixed Event */
 582
 583         if (event > ACPI_EVENT_MAX) {
 584                 return_ACPI_STATUS(AE_BAD_PARAMETER);
 585         }
 586
 587         /* Get the status of the requested fixed event */
 588
 589         status =
 590             acpi_read_bit_register(acpi_gbl_fixed_event_info[event].
 591                               enable_register_id, &value);
 592         if (ACPI_FAILURE(status))
 593                 return_ACPI_STATUS(status);
 594
 595         *event_status = value;
 596
 597         status =
 598             acpi_read_bit_register(acpi_gbl_fixed_event_info[event].
 599                               status_register_id, &value);
 600         if (ACPI_FAILURE(status))
 601                 return_ACPI_STATUS(status);
 602
 603         if (value)
 604                 *event_status |= ACPI_EVENT_FLAG_SET;
 605
 606         if (acpi_gbl_fixed_event_handlers[event].handler)
 607                 *event_status |= ACPI_EVENT_FLAG_HANDLE;
 608
 609         return_ACPI_STATUS(status);
 610 }
 611
 612 ACPI_EXPORT_SYMBOL(acpi_get_event_status)
 613
 614 /*******************************************************************************
 615  *
 616  * FUNCTION:    acpi_get_gpe_status
 617  *
 618  * PARAMETERS:  gpe_device      - Parent GPE Device. NULL for GPE0/GPE1
 619  *              gpe_number      - GPE level within the GPE block
 620  *              event_status    - Where the current status of the event will
 621  *                                be returned
 622  *
 623  * RETURN:      Status
 624  *
 625  * DESCRIPTION: Get status of an event (general purpose)
 626  *
 627  ******************************************************************************/
 628 acpi_status
 629 acpi_get_gpe_status(acpi_handle gpe_device,
 630                     u32 gpe_number, acpi_event_status *event_status)
 631 {
 632         acpi_status status = AE_OK;
 633         struct acpi_gpe_event_info *gpe_event_info;
 634         acpi_cpu_flags flags;
 635
 636         ACPI_FUNCTION_TRACE(acpi_get_gpe_status);
 637
 638         flags = acpi_os_acquire_lock(acpi_gbl_gpe_lock);
 639
 640         /* Ensure that we have a valid GPE number */
 641
 642         gpe_event_info = acpi_ev_get_gpe_event_info(gpe_device, gpe_number);
 643         if (!gpe_event_info) {
 644                 status = AE_BAD_PARAMETER;
 645                 goto unlock_and_exit;
 646         }
 647
 648         /* Obtain status on the requested GPE number */
 649
 650         status = acpi_hw_get_gpe_status(gpe_event_info, event_status);
 651
 652         if (gpe_event_info->flags & ACPI_GPE_DISPATCH_MASK)
 653                 *event_status |= ACPI_EVENT_FLAG_HANDLE;
 654
 655       unlock_and_exit:
 656         acpi_os_release_lock(acpi_gbl_gpe_lock, flags);
 657         return_ACPI_STATUS(status);
 658 }
 659
 660 ACPI_EXPORT_SYMBOL(acpi_get_gpe_status)
 661 /*******************************************************************************
 662  *
 663  * FUNCTION:    acpi_install_gpe_block
 664  *
 665  * PARAMETERS:  gpe_device          - Handle to the parent GPE Block Device
 666  *              gpe_block_address   - Address and space_iD
 667  *              register_count      - Number of GPE register pairs in the block
 668  *              interrupt_number    - H/W interrupt for the block
 669  *
 670  * RETURN:      Status
 671  *
 672  * DESCRIPTION: Create and Install a block of GPE registers
 673  *
 674  ******************************************************************************/
 675 acpi_status
 676 acpi_install_gpe_block(acpi_handle gpe_device,
 677                        struct acpi_generic_address *gpe_block_address,
 678                        u32 register_count, u32 interrupt_number)
 679 {
 680         acpi_status status;
 681         union acpi_operand_object *obj_desc;
 682         struct acpi_namespace_node *node;
 683         struct acpi_gpe_block_info *gpe_block;
 684
 685         ACPI_FUNCTION_TRACE(acpi_install_gpe_block);
 686
 687         if ((!gpe_device) || (!gpe_block_address) || (!register_count)) {
 688                 return_ACPI_STATUS(AE_BAD_PARAMETER);
 689         }
 690
 691         status = acpi_ut_acquire_mutex(ACPI_MTX_NAMESPACE);
 692         if (ACPI_FAILURE(status)) {
 693                 return (status);
 694         }
 695
 696         node = acpi_ns_validate_handle(gpe_device);
 697         if (!node) {
 698                 status = AE_BAD_PARAMETER;
 699                 goto unlock_and_exit;
 700         }
 701
 702         /*
 703          * For user-installed GPE Block Devices, the gpe_block_base_number
 704          * is always zero
 705          */
 706         status =
 707             acpi_ev_create_gpe_block(node, gpe_block_address, register_count, 0,
 708                                      interrupt_number, &gpe_block);
 709         if (ACPI_FAILURE(status)) {
 710                 goto unlock_and_exit;
 711         }
 712
 713         /* Install block in the device_object attached to the node */
 714
 715         obj_desc = acpi_ns_get_attached_object(node);
 716         if (!obj_desc) {
 717
 718                 /*
 719                  * No object, create a new one (Device nodes do not always have
 720                  * an attached object)
 721                  */
 722                 obj_desc = acpi_ut_create_internal_object(ACPI_TYPE_DEVICE);
 723                 if (!obj_desc) {
 724                         status = AE_NO_MEMORY;
 725                         goto unlock_and_exit;
 726                 }
 727
 728                 status =
 729                     acpi_ns_attach_object(node, obj_desc, ACPI_TYPE_DEVICE);
 730
 731                 /* Remove local reference to the object */
 732
 733                 acpi_ut_remove_reference(obj_desc);
 734
 735                 if (ACPI_FAILURE(status)) {
 736                         goto unlock_and_exit;
 737                 }
 738         }
 739
 740         /* Now install the GPE block in the device_object */
 741
 742         obj_desc->device.gpe_block = gpe_block;
 743
 744         /* Run the _PRW methods and enable the runtime GPEs in the new block */
 745
 746         status = acpi_ev_initialize_gpe_block(node, gpe_block);
 747
 748       unlock_and_exit:
 749         (void)acpi_ut_release_mutex(ACPI_MTX_NAMESPACE);
 750         return_ACPI_STATUS(status);
 751 }
 752
 753 ACPI_EXPORT_SYMBOL(acpi_install_gpe_block)
 754
 755 /*******************************************************************************
 756  *
 757  * FUNCTION:    acpi_remove_gpe_block
 758  *
 759  * PARAMETERS:  gpe_device          - Handle to the parent GPE Block Device
 760  *
 761  * RETURN:      Status
 762  *
 763  * DESCRIPTION: Remove a previously installed block of GPE registers
 764  *
 765  ******************************************************************************/
 766 acpi_status acpi_remove_gpe_block(acpi_handle gpe_device)
 767 {
 768         union acpi_operand_object *obj_desc;
 769         acpi_status status;
 770         struct acpi_namespace_node *node;
 771
 772         ACPI_FUNCTION_TRACE(acpi_remove_gpe_block);
 773
 774         if (!gpe_device) {
 775                 return_ACPI_STATUS(AE_BAD_PARAMETER);
 776         }
 777
 778         status = acpi_ut_acquire_mutex(ACPI_MTX_NAMESPACE);
 779         if (ACPI_FAILURE(status)) {
 780                 return (status);
 781         }
 782
 783         node = acpi_ns_validate_handle(gpe_device);
 784         if (!node) {
 785                 status = AE_BAD_PARAMETER;
 786                 goto unlock_and_exit;
 787         }
 788
 789         /* Get the device_object attached to the node */
 790
 791         obj_desc = acpi_ns_get_attached_object(node);
 792         if (!obj_desc || !obj_desc->device.gpe_block) {
 793                 return_ACPI_STATUS(AE_NULL_OBJECT);
 794         }
 795
 796         /* Delete the GPE block (but not the device_object) */
 797
 798         status = acpi_ev_delete_gpe_block(obj_desc->device.gpe_block);
 799         if (ACPI_SUCCESS(status)) {
 800                 obj_desc->device.gpe_block = NULL;
 801         }
 802
 803       unlock_and_exit:
 804         (void)acpi_ut_release_mutex(ACPI_MTX_NAMESPACE);
 805         return_ACPI_STATUS(status);
 806 }
 807
 808 ACPI_EXPORT_SYMBOL(acpi_remove_gpe_block)
 809
 810 /*******************************************************************************
 811  *
 812  * FUNCTION:    acpi_get_gpe_device
 813  *
 814  * PARAMETERS:  Index               - System GPE index (0-current_gpe_count)
 815  *              gpe_device          - Where the parent GPE Device is returned
 816  *
 817  * RETURN:      Status
 818  *
 819  * DESCRIPTION: Obtain the GPE device associated with the input index. A NULL
 820  *              gpe device indicates that the gpe number is contained in one of
 821  *              the FADT-defined gpe blocks. Otherwise, the GPE block device.
 822  *
 823  ******************************************************************************/
 824 acpi_status
 825 acpi_get_gpe_device(u32 index, acpi_handle *gpe_device)
 826 {
 827         struct acpi_gpe_device_info info;
 828         acpi_status status;
 829
 830         ACPI_FUNCTION_TRACE(acpi_get_gpe_device);
 831
 832         if (!gpe_device) {
 833                 return_ACPI_STATUS(AE_BAD_PARAMETER);
 834         }
 835
 836         if (index >= acpi_current_gpe_count) {
 837                 return_ACPI_STATUS(AE_NOT_EXIST);
 838         }
 839
 840         /* Setup and walk the GPE list */
 841
 842         info.index = index;
 843         info.status = AE_NOT_EXIST;
 844         info.gpe_device = NULL;
 845         info.next_block_base_index = 0;
 846
 847         status = acpi_ev_walk_gpe_list(acpi_ev_get_gpe_device, &info);
 848         if (ACPI_FAILURE(status)) {
 849                 return_ACPI_STATUS(status);
 850         }
 851
 852         *gpe_device = info.gpe_device;
 853         return_ACPI_STATUS(info.status);
 854 }
 855
 856 ACPI_EXPORT_SYMBOL(acpi_get_gpe_device)
 857
 858 /*******************************************************************************
 859  *
 860  * FUNCTION:    acpi_ev_get_gpe_device
 861  *
 862  * PARAMETERS:  GPE_WALK_CALLBACK
 863  *
 864  * RETURN:      Status
 865  *
 866  * DESCRIPTION: Matches the input GPE index (0-current_gpe_count) with a GPE
 867  *              block device. NULL if the GPE is one of the FADT-defined GPEs.
 868  *
 869  ******************************************************************************/
 870 static acpi_status
 871 acpi_ev_get_gpe_device(struct acpi_gpe_xrupt_info *gpe_xrupt_info,
 872                        struct acpi_gpe_block_info *gpe_block, void *context)
 873 {
 874         struct acpi_gpe_device_info *info = context;
 875
 876         /* Increment Index by the number of GPEs in this block */
 877
 878         info->next_block_base_index += gpe_block->gpe_count;
 879
 880         if (info->index < info->next_block_base_index) {
 881                 /*
 882                  * The GPE index is within this block, get the node. Leave the node
 883                  * NULL for the FADT-defined GPEs
 884                  */
 885                 if ((gpe_block->node)->type == ACPI_TYPE_DEVICE) {
 886                         info->gpe_device = gpe_block->node;
 887                 }
 888
 889                 info->status = AE_OK;
 890                 return (AE_CTRL_END);
 891         }
 892
 893         return (AE_OK);
 894 }
 895
 896 /******************************************************************************
 897  *
 898  * FUNCTION:    acpi_disable_all_gpes
 899  *
 900  * PARAMETERS:  None
 901  *
 902  * RETURN:      Status
 903  *
 904  * DESCRIPTION: Disable and clear all GPEs in all GPE blocks
 905  *
 906  ******************************************************************************/
 907
 908 acpi_status acpi_disable_all_gpes(void)
 909 {
 910         acpi_status status;
 911
 912         ACPI_FUNCTION_TRACE(acpi_disable_all_gpes);
 913
 914         status = acpi_ut_acquire_mutex(ACPI_MTX_EVENTS);
 915         if (ACPI_FAILURE(status)) {
 916                 return_ACPI_STATUS(status);
 917         }
 918
 919         status = acpi_hw_disable_all_gpes();
 920         (void)acpi_ut_release_mutex(ACPI_MTX_EVENTS);
 921
 922         return_ACPI_STATUS(status);
 923 }
 924
 925 /******************************************************************************
 926  *
 927  * FUNCTION:    acpi_enable_all_runtime_gpes
 928  *
 929  * PARAMETERS:  None
 930  *
 931  * RETURN:      Status
 932  *
 933  * DESCRIPTION: Enable all "runtime" GPEs, in all GPE blocks
 934  *
 935  ******************************************************************************/
 936
 937 acpi_status acpi_enable_all_runtime_gpes(void)
 938 {
 939         acpi_status status;
 940
 941         ACPI_FUNCTION_TRACE(acpi_enable_all_runtime_gpes);
 942
 943         status = acpi_ut_acquire_mutex(ACPI_MTX_EVENTS);
 944         if (ACPI_FAILURE(status)) {
 945                 return_ACPI_STATUS(status);
 946         }
 947
 948         status = acpi_hw_enable_all_runtime_gpes();
 949         (void)acpi_ut_release_mutex(ACPI_MTX_EVENTS);
 950
 951         return_ACPI_STATUS(status);
 952 }