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
 207  *              gpe_number      - GPE level within the GPE block
 208  *              action          - Enable or disable
 209  *                                Called from ISR or not
 210  *
 211  * RETURN:      Status
 212  *
 213  * DESCRIPTION: Enable or disable an ACPI event (general purpose)
 214  *
 215  ******************************************************************************/
 216 acpi_status acpi_set_gpe(acpi_handle gpe_device, u32 gpe_number, u8 action)
 217 {
 218         acpi_status status = AE_OK;
 219         acpi_cpu_flags flags;
 220         struct acpi_gpe_event_info *gpe_event_info;
 221
 222         ACPI_FUNCTION_TRACE(acpi_set_gpe);
 223
 224         flags = acpi_os_acquire_lock(acpi_gbl_gpe_lock);
 225
 226         /* Ensure that we have a valid GPE number */
 227
 228         gpe_event_info = acpi_ev_get_gpe_event_info(gpe_device, gpe_number);
 229         if (!gpe_event_info) {
 230                 status = AE_BAD_PARAMETER;
 231                 goto unlock_and_exit;
 232         }
 233
 234         /* Perform the action */
 235
 236         switch (action) {
 237         case ACPI_GPE_ENABLE:
 238                 status = acpi_ev_enable_gpe(gpe_event_info);
 239                 break;
 240
 241         case ACPI_GPE_DISABLE:
 242                 status = acpi_ev_disable_gpe(gpe_event_info);
 243                 break;
 244
 245         default:
 246                 ACPI_ERROR((AE_INFO, "Invalid action\n"));
 247                 status = AE_BAD_PARAMETER;
 248                 break;
 249         }
 250
 251       unlock_and_exit:
 252         acpi_os_release_lock(acpi_gbl_gpe_lock, flags);
 253         return_ACPI_STATUS(status);
 254 }
 255
 256 ACPI_EXPORT_SYMBOL(acpi_set_gpe)
 257
 258 /*******************************************************************************
 259  *
 260  * FUNCTION:    acpi_enable_gpe
 261  *
 262  * PARAMETERS:  gpe_device      - Parent GPE Device
 263  *              gpe_number      - GPE level within the GPE block
 264  *              type            - Purpose the GPE will be used for
 265  *
 266  * RETURN:      Status
 267  *
 268  * DESCRIPTION: Take a reference to a GPE and enable it if necessary
 269  *
 270  ******************************************************************************/
 271 acpi_status acpi_enable_gpe(acpi_handle gpe_device, u32 gpe_number, u8 type)
 272 {
 273         acpi_status status = AE_OK;
 274         acpi_cpu_flags flags;
 275         struct acpi_gpe_event_info *gpe_event_info;
 276
 277         ACPI_FUNCTION_TRACE(acpi_enable_gpe);
 278
 279         if (type & ~ACPI_GPE_TYPE_WAKE_RUN)
 280                 return_ACPI_STATUS(AE_BAD_PARAMETER);
 281
 282         flags = acpi_os_acquire_lock(acpi_gbl_gpe_lock);
 283
 284         /* Ensure that we have a valid GPE number */
 285
 286         gpe_event_info = acpi_ev_get_gpe_event_info(gpe_device, gpe_number);
 287         if (!gpe_event_info) {
 288                 status = AE_BAD_PARAMETER;
 289                 goto unlock_and_exit;
 290         }
 291
 292         if (type & ACPI_GPE_TYPE_RUNTIME) {
 293                 if (++gpe_event_info->runtime_count == 1) {
 294                         status = acpi_ev_enable_gpe(gpe_event_info);
 295                         if (ACPI_FAILURE(status))
 296                                 gpe_event_info->runtime_count--;
 297                 }
 298         }
 299
 300         if (type & ACPI_GPE_TYPE_WAKE) {
 301                 if (!(gpe_event_info->flags & ACPI_GPE_CAN_WAKE)) {
 302                         status = AE_BAD_PARAMETER;
 303                         goto unlock_and_exit;
 304                 }
 305
 306                 /*
 307                  * Wake-up GPEs are only enabled right prior to putting the
 308                  * system into a sleep state.
 309                  */
 310                 if (++gpe_event_info->wakeup_count == 1)
 311                         acpi_ev_update_gpe_enable_masks(gpe_event_info);
 312         }
 313
 314 unlock_and_exit:
 315         acpi_os_release_lock(acpi_gbl_gpe_lock, flags);
 316         return_ACPI_STATUS(status);
 317 }
 318 ACPI_EXPORT_SYMBOL(acpi_enable_gpe)
 319
 320 /*******************************************************************************
 321  *
 322  * FUNCTION:    acpi_disable_gpe
 323  *
 324  * PARAMETERS:  gpe_device      - Parent GPE Device
 325  *              gpe_number      - GPE level within the GPE block
 326  *              type            - Purpose the GPE won't be used for any more
 327  *
 328  * RETURN:      Status
 329  *
 330  * DESCRIPTION: Release a reference to a GPE and disable it if necessary
 331  *
 332  ******************************************************************************/
 333 acpi_status acpi_disable_gpe(acpi_handle gpe_device, u32 gpe_number, u8 type)
 334 {
 335         acpi_status status = AE_OK;
 336         acpi_cpu_flags flags;
 337         struct acpi_gpe_event_info *gpe_event_info;
 338
 339         ACPI_FUNCTION_TRACE(acpi_disable_gpe);
 340
 341         if (type & ~ACPI_GPE_TYPE_WAKE_RUN)
 342                 return_ACPI_STATUS(AE_BAD_PARAMETER);
 343
 344         flags = acpi_os_acquire_lock(acpi_gbl_gpe_lock);
 345         /* Ensure that we have a valid GPE number */
 346
 347         gpe_event_info = acpi_ev_get_gpe_event_info(gpe_device, gpe_number);
 348         if (!gpe_event_info) {
 349                 status = AE_BAD_PARAMETER;
 350                 goto unlock_and_exit;
 351         }
 352
 353         if ((type & ACPI_GPE_TYPE_RUNTIME) && gpe_event_info->runtime_count) {
 354                 if (--gpe_event_info->runtime_count == 0)
 355                         status = acpi_ev_disable_gpe(gpe_event_info);
 356         }
 357
 358         if ((type & ACPI_GPE_TYPE_WAKE) && gpe_event_info->wakeup_count) {
 359                 /*
 360                  * Wake-up GPEs are not enabled after leaving system sleep
 361                  * states, so we don't need to disable them here.
 362                  */
 363                 if (--gpe_event_info->wakeup_count == 0)
 364                         acpi_ev_update_gpe_enable_masks(gpe_event_info);
 365         }
 366
 367 unlock_and_exit:
 368         acpi_os_release_lock(acpi_gbl_gpe_lock, flags);
 369         return_ACPI_STATUS(status);
 370 }
 371 ACPI_EXPORT_SYMBOL(acpi_disable_gpe)
 372
 373 /*******************************************************************************
 374  *
 375  * FUNCTION:    acpi_disable_event
 376  *
 377  * PARAMETERS:  Event           - The fixed eventto be enabled
 378  *              Flags           - Reserved
 379  *
 380  * RETURN:      Status
 381  *
 382  * DESCRIPTION: Disable an ACPI event (fixed)
 383  *
 384  ******************************************************************************/
 385 acpi_status acpi_disable_event(u32 event, u32 flags)
 386 {
 387         acpi_status status = AE_OK;
 388         u32 value;
 389
 390         ACPI_FUNCTION_TRACE(acpi_disable_event);
 391
 392         /* Decode the Fixed Event */
 393
 394         if (event > ACPI_EVENT_MAX) {
 395                 return_ACPI_STATUS(AE_BAD_PARAMETER);
 396         }
 397
 398         /*
 399          * Disable the requested fixed event (by writing a zero to the enable
 400          * register bit)
 401          */
 402         status =
 403             acpi_write_bit_register(acpi_gbl_fixed_event_info[event].
 404                                     enable_register_id, ACPI_DISABLE_EVENT);
 405         if (ACPI_FAILURE(status)) {
 406                 return_ACPI_STATUS(status);
 407         }
 408
 409         status =
 410             acpi_read_bit_register(acpi_gbl_fixed_event_info[event].
 411                                    enable_register_id, &value);
 412         if (ACPI_FAILURE(status)) {
 413                 return_ACPI_STATUS(status);
 414         }
 415
 416         if (value != 0) {
 417                 ACPI_ERROR((AE_INFO,
 418                             "Could not disable %s events",
 419                             acpi_ut_get_event_name(event)));
 420                 return_ACPI_STATUS(AE_NO_HARDWARE_RESPONSE);
 421         }
 422
 423         return_ACPI_STATUS(status);
 424 }
 425
 426 ACPI_EXPORT_SYMBOL(acpi_disable_event)
 427
 428 /*******************************************************************************
 429  *
 430  * FUNCTION:    acpi_clear_event
 431  *
 432  * PARAMETERS:  Event           - The fixed event to be cleared
 433  *
 434  * RETURN:      Status
 435  *
 436  * DESCRIPTION: Clear an ACPI event (fixed)
 437  *
 438  ******************************************************************************/
 439 acpi_status acpi_clear_event(u32 event)
 440 {
 441         acpi_status status = AE_OK;
 442
 443         ACPI_FUNCTION_TRACE(acpi_clear_event);
 444
 445         /* Decode the Fixed Event */
 446
 447         if (event > ACPI_EVENT_MAX) {
 448                 return_ACPI_STATUS(AE_BAD_PARAMETER);
 449         }
 450
 451         /*
 452          * Clear the requested fixed event (By writing a one to the status
 453          * register bit)
 454          */
 455         status =
 456             acpi_write_bit_register(acpi_gbl_fixed_event_info[event].
 457                                     status_register_id, ACPI_CLEAR_STATUS);
 458
 459         return_ACPI_STATUS(status);
 460 }
 461
 462 ACPI_EXPORT_SYMBOL(acpi_clear_event)
 463
 464 /*******************************************************************************
 465  *
 466  * FUNCTION:    acpi_clear_gpe
 467  *
 468  * PARAMETERS:  gpe_device      - Parent GPE Device
 469  *              gpe_number      - GPE level within the GPE block
 470  *              Flags           - Called from an ISR or not
 471  *
 472  * RETURN:      Status
 473  *
 474  * DESCRIPTION: Clear an ACPI event (general purpose)
 475  *
 476  ******************************************************************************/
 477 acpi_status acpi_clear_gpe(acpi_handle gpe_device, u32 gpe_number, u32 flags)
 478 {
 479         acpi_status status = AE_OK;
 480         struct acpi_gpe_event_info *gpe_event_info;
 481
 482         ACPI_FUNCTION_TRACE(acpi_clear_gpe);
 483
 484         /* Use semaphore lock if not executing at interrupt level */
 485
 486         if (flags & ACPI_NOT_ISR) {
 487                 status = acpi_ut_acquire_mutex(ACPI_MTX_EVENTS);
 488                 if (ACPI_FAILURE(status)) {
 489                         return_ACPI_STATUS(status);
 490                 }
 491         }
 492
 493         /* Ensure that we have a valid GPE number */
 494
 495         gpe_event_info = acpi_ev_get_gpe_event_info(gpe_device, gpe_number);
 496         if (!gpe_event_info) {
 497                 status = AE_BAD_PARAMETER;
 498                 goto unlock_and_exit;
 499         }
 500
 501         status = acpi_hw_clear_gpe(gpe_event_info);
 502
 503       unlock_and_exit:
 504         if (flags & ACPI_NOT_ISR) {
 505                 (void)acpi_ut_release_mutex(ACPI_MTX_EVENTS);
 506         }
 507         return_ACPI_STATUS(status);
 508 }
 509
 510 ACPI_EXPORT_SYMBOL(acpi_clear_gpe)
 511 /*******************************************************************************
 512  *
 513  * FUNCTION:    acpi_get_event_status
 514  *
 515  * PARAMETERS:  Event           - The fixed event
 516  *              event_status    - Where the current status of the event will
 517  *                                be returned
 518  *
 519  * RETURN:      Status
 520  *
 521  * DESCRIPTION: Obtains and returns the current status of the event
 522  *
 523  ******************************************************************************/
 524 acpi_status acpi_get_event_status(u32 event, acpi_event_status * event_status)
 525 {
 526         acpi_status status = AE_OK;
 527         u32 value;
 528
 529         ACPI_FUNCTION_TRACE(acpi_get_event_status);
 530
 531         if (!event_status) {
 532                 return_ACPI_STATUS(AE_BAD_PARAMETER);
 533         }
 534
 535         /* Decode the Fixed Event */
 536
 537         if (event > ACPI_EVENT_MAX) {
 538                 return_ACPI_STATUS(AE_BAD_PARAMETER);
 539         }
 540
 541         /* Get the status of the requested fixed event */
 542
 543         status =
 544             acpi_read_bit_register(acpi_gbl_fixed_event_info[event].
 545                               enable_register_id, &value);
 546         if (ACPI_FAILURE(status))
 547                 return_ACPI_STATUS(status);
 548
 549         *event_status = value;
 550
 551         status =
 552             acpi_read_bit_register(acpi_gbl_fixed_event_info[event].
 553                               status_register_id, &value);
 554         if (ACPI_FAILURE(status))
 555                 return_ACPI_STATUS(status);
 556
 557         if (value)
 558                 *event_status |= ACPI_EVENT_FLAG_SET;
 559
 560         if (acpi_gbl_fixed_event_handlers[event].handler)
 561                 *event_status |= ACPI_EVENT_FLAG_HANDLE;
 562
 563         return_ACPI_STATUS(status);
 564 }
 565
 566 ACPI_EXPORT_SYMBOL(acpi_get_event_status)
 567
 568 /*******************************************************************************
 569  *
 570  * FUNCTION:    acpi_get_gpe_status
 571  *
 572  * PARAMETERS:  gpe_device      - Parent GPE Device
 573  *              gpe_number      - GPE level within the GPE block
 574  *              Flags           - Called from an ISR or not
 575  *              event_status    - Where the current status of the event will
 576  *                                be returned
 577  *
 578  * RETURN:      Status
 579  *
 580  * DESCRIPTION: Get status of an event (general purpose)
 581  *
 582  ******************************************************************************/
 583 acpi_status
 584 acpi_get_gpe_status(acpi_handle gpe_device,
 585                     u32 gpe_number, u32 flags, acpi_event_status * event_status)
 586 {
 587         acpi_status status = AE_OK;
 588         struct acpi_gpe_event_info *gpe_event_info;
 589
 590         ACPI_FUNCTION_TRACE(acpi_get_gpe_status);
 591
 592         /* Use semaphore lock if not executing at interrupt level */
 593
 594         if (flags & ACPI_NOT_ISR) {
 595                 status = acpi_ut_acquire_mutex(ACPI_MTX_EVENTS);
 596                 if (ACPI_FAILURE(status)) {
 597                         return_ACPI_STATUS(status);
 598                 }
 599         }
 600
 601         /* Ensure that we have a valid GPE number */
 602
 603         gpe_event_info = acpi_ev_get_gpe_event_info(gpe_device, gpe_number);
 604         if (!gpe_event_info) {
 605                 status = AE_BAD_PARAMETER;
 606                 goto unlock_and_exit;
 607         }
 608
 609         /* Obtain status on the requested GPE number */
 610
 611         status = acpi_hw_get_gpe_status(gpe_event_info, event_status);
 612
 613         if (gpe_event_info->flags & ACPI_GPE_DISPATCH_MASK)
 614                 *event_status |= ACPI_EVENT_FLAG_HANDLE;
 615
 616       unlock_and_exit:
 617         if (flags & ACPI_NOT_ISR) {
 618                 (void)acpi_ut_release_mutex(ACPI_MTX_EVENTS);
 619         }
 620         return_ACPI_STATUS(status);
 621 }
 622
 623 ACPI_EXPORT_SYMBOL(acpi_get_gpe_status)
 624 /*******************************************************************************
 625  *
 626  * FUNCTION:    acpi_install_gpe_block
 627  *
 628  * PARAMETERS:  gpe_device          - Handle to the parent GPE Block Device
 629  *              gpe_block_address   - Address and space_iD
 630  *              register_count      - Number of GPE register pairs in the block
 631  *              interrupt_number    - H/W interrupt for the block
 632  *
 633  * RETURN:      Status
 634  *
 635  * DESCRIPTION: Create and Install a block of GPE registers
 636  *
 637  ******************************************************************************/
 638 acpi_status
 639 acpi_install_gpe_block(acpi_handle gpe_device,
 640                        struct acpi_generic_address *gpe_block_address,
 641                        u32 register_count, u32 interrupt_number)
 642 {
 643         acpi_status status;
 644         union acpi_operand_object *obj_desc;
 645         struct acpi_namespace_node *node;
 646         struct acpi_gpe_block_info *gpe_block;
 647
 648         ACPI_FUNCTION_TRACE(acpi_install_gpe_block);
 649
 650         if ((!gpe_device) || (!gpe_block_address) || (!register_count)) {
 651                 return_ACPI_STATUS(AE_BAD_PARAMETER);
 652         }
 653
 654         status = acpi_ut_acquire_mutex(ACPI_MTX_NAMESPACE);
 655         if (ACPI_FAILURE(status)) {
 656                 return (status);
 657         }
 658
 659         node = acpi_ns_validate_handle(gpe_device);
 660         if (!node) {
 661                 status = AE_BAD_PARAMETER;
 662                 goto unlock_and_exit;
 663         }
 664
 665         /*
 666          * For user-installed GPE Block Devices, the gpe_block_base_number
 667          * is always zero
 668          */
 669         status =
 670             acpi_ev_create_gpe_block(node, gpe_block_address, register_count, 0,
 671                                      interrupt_number, &gpe_block);
 672         if (ACPI_FAILURE(status)) {
 673                 goto unlock_and_exit;
 674         }
 675
 676         /* Run the _PRW methods and enable the GPEs */
 677
 678         status = acpi_ev_initialize_gpe_block(node, gpe_block);
 679         if (ACPI_FAILURE(status)) {
 680                 goto unlock_and_exit;
 681         }
 682
 683         /* Get the device_object attached to the node */
 684
 685         obj_desc = acpi_ns_get_attached_object(node);
 686         if (!obj_desc) {
 687
 688                 /* No object, create a new one */
 689
 690                 obj_desc = acpi_ut_create_internal_object(ACPI_TYPE_DEVICE);
 691                 if (!obj_desc) {
 692                         status = AE_NO_MEMORY;
 693                         goto unlock_and_exit;
 694                 }
 695
 696                 status =
 697                     acpi_ns_attach_object(node, obj_desc, ACPI_TYPE_DEVICE);
 698
 699                 /* Remove local reference to the object */
 700
 701                 acpi_ut_remove_reference(obj_desc);
 702
 703                 if (ACPI_FAILURE(status)) {
 704                         goto unlock_and_exit;
 705                 }
 706         }
 707
 708         /* Install the GPE block in the device_object */
 709
 710         obj_desc->device.gpe_block = gpe_block;
 711
 712       unlock_and_exit:
 713         (void)acpi_ut_release_mutex(ACPI_MTX_NAMESPACE);
 714         return_ACPI_STATUS(status);
 715 }
 716
 717 ACPI_EXPORT_SYMBOL(acpi_install_gpe_block)
 718
 719 /*******************************************************************************
 720  *
 721  * FUNCTION:    acpi_remove_gpe_block
 722  *
 723  * PARAMETERS:  gpe_device          - Handle to the parent GPE Block Device
 724  *
 725  * RETURN:      Status
 726  *
 727  * DESCRIPTION: Remove a previously installed block of GPE registers
 728  *
 729  ******************************************************************************/
 730 acpi_status acpi_remove_gpe_block(acpi_handle gpe_device)
 731 {
 732         union acpi_operand_object *obj_desc;
 733         acpi_status status;
 734         struct acpi_namespace_node *node;
 735
 736         ACPI_FUNCTION_TRACE(acpi_remove_gpe_block);
 737
 738         if (!gpe_device) {
 739                 return_ACPI_STATUS(AE_BAD_PARAMETER);
 740         }
 741
 742         status = acpi_ut_acquire_mutex(ACPI_MTX_NAMESPACE);
 743         if (ACPI_FAILURE(status)) {
 744                 return (status);
 745         }
 746
 747         node = acpi_ns_validate_handle(gpe_device);
 748         if (!node) {
 749                 status = AE_BAD_PARAMETER;
 750                 goto unlock_and_exit;
 751         }
 752
 753         /* Get the device_object attached to the node */
 754
 755         obj_desc = acpi_ns_get_attached_object(node);
 756         if (!obj_desc || !obj_desc->device.gpe_block) {
 757                 return_ACPI_STATUS(AE_NULL_OBJECT);
 758         }
 759
 760         /* Delete the GPE block (but not the device_object) */
 761
 762         status = acpi_ev_delete_gpe_block(obj_desc->device.gpe_block);
 763         if (ACPI_SUCCESS(status)) {
 764                 obj_desc->device.gpe_block = NULL;
 765         }
 766
 767       unlock_and_exit:
 768         (void)acpi_ut_release_mutex(ACPI_MTX_NAMESPACE);
 769         return_ACPI_STATUS(status);
 770 }
 771
 772 ACPI_EXPORT_SYMBOL(acpi_remove_gpe_block)
 773
 774 /*******************************************************************************
 775  *
 776  * FUNCTION:    acpi_get_gpe_device
 777  *
 778  * PARAMETERS:  Index               - System GPE index (0-current_gpe_count)
 779  *              gpe_device          - Where the parent GPE Device is returned
 780  *
 781  * RETURN:      Status
 782  *
 783  * DESCRIPTION: Obtain the GPE device associated with the input index. A NULL
 784  *              gpe device indicates that the gpe number is contained in one of
 785  *              the FADT-defined gpe blocks. Otherwise, the GPE block device.
 786  *
 787  ******************************************************************************/
 788 acpi_status
 789 acpi_get_gpe_device(u32 index, acpi_handle *gpe_device)
 790 {
 791         struct acpi_gpe_device_info info;
 792         acpi_status status;
 793
 794         ACPI_FUNCTION_TRACE(acpi_get_gpe_device);
 795
 796         if (!gpe_device) {
 797                 return_ACPI_STATUS(AE_BAD_PARAMETER);
 798         }
 799
 800         if (index >= acpi_current_gpe_count) {
 801                 return_ACPI_STATUS(AE_NOT_EXIST);
 802         }
 803
 804         /* Setup and walk the GPE list */
 805
 806         info.index = index;
 807         info.status = AE_NOT_EXIST;
 808         info.gpe_device = NULL;
 809         info.next_block_base_index = 0;
 810
 811         status = acpi_ev_walk_gpe_list(acpi_ev_get_gpe_device, &info);
 812         if (ACPI_FAILURE(status)) {
 813                 return_ACPI_STATUS(status);
 814         }
 815
 816         *gpe_device = info.gpe_device;
 817         return_ACPI_STATUS(info.status);
 818 }
 819
 820 ACPI_EXPORT_SYMBOL(acpi_get_gpe_device)
 821
 822 /*******************************************************************************
 823  *
 824  * FUNCTION:    acpi_ev_get_gpe_device
 825  *
 826  * PARAMETERS:  GPE_WALK_CALLBACK
 827  *
 828  * RETURN:      Status
 829  *
 830  * DESCRIPTION: Matches the input GPE index (0-current_gpe_count) with a GPE
 831  *              block device. NULL if the GPE is one of the FADT-defined GPEs.
 832  *
 833  ******************************************************************************/
 834 static acpi_status
 835 acpi_ev_get_gpe_device(struct acpi_gpe_xrupt_info *gpe_xrupt_info,
 836                        struct acpi_gpe_block_info *gpe_block, void *context)
 837 {
 838         struct acpi_gpe_device_info *info = context;
 839
 840         /* Increment Index by the number of GPEs in this block */
 841
 842         info->next_block_base_index +=
 843             (gpe_block->register_count * ACPI_GPE_REGISTER_WIDTH);
 844
 845         if (info->index < info->next_block_base_index) {
 846                 /*
 847                  * The GPE index is within this block, get the node. Leave the node
 848                  * NULL for the FADT-defined GPEs
 849                  */
 850                 if ((gpe_block->node)->type == ACPI_TYPE_DEVICE) {
 851                         info->gpe_device = gpe_block->node;
 852                 }
 853
 854                 info->status = AE_OK;
 855                 return (AE_CTRL_END);
 856         }
 857
 858         return (AE_OK);
 859 }
 860
 861 /******************************************************************************
 862  *
 863  * FUNCTION:    acpi_disable_all_gpes
 864  *
 865  * PARAMETERS:  None
 866  *
 867  * RETURN:      Status
 868  *
 869  * DESCRIPTION: Disable and clear all GPEs in all GPE blocks
 870  *
 871  ******************************************************************************/
 872
 873 acpi_status acpi_disable_all_gpes(void)
 874 {
 875         acpi_status status;
 876
 877         ACPI_FUNCTION_TRACE(acpi_disable_all_gpes);
 878
 879         status = acpi_ut_acquire_mutex(ACPI_MTX_EVENTS);
 880         if (ACPI_FAILURE(status)) {
 881                 return_ACPI_STATUS(status);
 882         }
 883
 884         status = acpi_hw_disable_all_gpes();
 885         (void)acpi_ut_release_mutex(ACPI_MTX_EVENTS);
 886
 887         return_ACPI_STATUS(status);
 888 }
 889
 890 /******************************************************************************
 891  *
 892  * FUNCTION:    acpi_enable_all_runtime_gpes
 893  *
 894  * PARAMETERS:  None
 895  *
 896  * RETURN:      Status
 897  *
 898  * DESCRIPTION: Enable all "runtime" GPEs, in all GPE blocks
 899  *
 900  ******************************************************************************/
 901
 902 acpi_status acpi_enable_all_runtime_gpes(void)
 903 {
 904         acpi_status status;
 905
 906         ACPI_FUNCTION_TRACE(acpi_enable_all_runtime_gpes);
 907
 908         status = acpi_ut_acquire_mutex(ACPI_MTX_EVENTS);
 909         if (ACPI_FAILURE(status)) {
 910                 return_ACPI_STATUS(status);
 911         }
 912
 913         status = acpi_hw_enable_all_runtime_gpes();
 914         (void)acpi_ut_release_mutex(ACPI_MTX_EVENTS);
 915
 916         return_ACPI_STATUS(status);
 917 }