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;
  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                 return_ACPI_STATUS(AE_OK);
  88         }
  89
  90         /* Transition to ACPI mode */
  91
  92         status = acpi_hw_set_mode(ACPI_SYS_MODE_ACPI);
  93         if (ACPI_FAILURE(status)) {
  94                 ACPI_ERROR((AE_INFO,
  95                             "Could not transition to ACPI mode"));
  96                 return_ACPI_STATUS(status);
  97         }
  98
  99         /* Sanity check that transition succeeded */
 100
 101         if (acpi_hw_get_mode() != ACPI_SYS_MODE_ACPI) {
 102                 ACPI_ERROR((AE_INFO,
 103                             "Hardware did not enter ACPI mode"));
 104                 return_ACPI_STATUS(AE_NO_HARDWARE_RESPONSE);
 105         }
 106
 107         ACPI_DEBUG_PRINT((ACPI_DB_INIT,
 108                           "Transition to ACPI mode successful\n"));
 109
 110         return_ACPI_STATUS(AE_OK);
 111 }
 112
 113 ACPI_EXPORT_SYMBOL(acpi_enable)
 114
 115 /*******************************************************************************
 116  *
 117  * FUNCTION:    acpi_disable
 118  *
 119  * PARAMETERS:  None
 120  *
 121  * RETURN:      Status
 122  *
 123  * DESCRIPTION: Transfers the system into LEGACY (non-ACPI) mode.
 124  *
 125  ******************************************************************************/
 126 acpi_status acpi_disable(void)
 127 {
 128         acpi_status status = AE_OK;
 129
 130         ACPI_FUNCTION_TRACE(acpi_disable);
 131
 132         if (acpi_hw_get_mode() == ACPI_SYS_MODE_LEGACY) {
 133                 ACPI_DEBUG_PRINT((ACPI_DB_INIT,
 134                                   "System is already in legacy (non-ACPI) mode\n"));
 135         } else {
 136                 /* Transition to LEGACY mode */
 137
 138                 status = acpi_hw_set_mode(ACPI_SYS_MODE_LEGACY);
 139
 140                 if (ACPI_FAILURE(status)) {
 141                         ACPI_ERROR((AE_INFO,
 142                                     "Could not exit ACPI mode to legacy mode"));
 143                         return_ACPI_STATUS(status);
 144                 }
 145
 146                 ACPI_DEBUG_PRINT((ACPI_DB_INIT, "ACPI mode disabled\n"));
 147         }
 148
 149         return_ACPI_STATUS(status);
 150 }
 151
 152 ACPI_EXPORT_SYMBOL(acpi_disable)
 153
 154 /*******************************************************************************
 155  *
 156  * FUNCTION:    acpi_enable_event
 157  *
 158  * PARAMETERS:  Event           - The fixed eventto be enabled
 159  *              Flags           - Reserved
 160  *
 161  * RETURN:      Status
 162  *
 163  * DESCRIPTION: Enable an ACPI event (fixed)
 164  *
 165  ******************************************************************************/
 166 acpi_status acpi_enable_event(u32 event, u32 flags)
 167 {
 168         acpi_status status = AE_OK;
 169         u32 value;
 170
 171         ACPI_FUNCTION_TRACE(acpi_enable_event);
 172
 173         /* Decode the Fixed Event */
 174
 175         if (event > ACPI_EVENT_MAX) {
 176                 return_ACPI_STATUS(AE_BAD_PARAMETER);
 177         }
 178
 179         /*
 180          * Enable the requested fixed event (by writing a one to the enable
 181          * register bit)
 182          */
 183         status =
 184             acpi_write_bit_register(acpi_gbl_fixed_event_info[event].
 185                                     enable_register_id, ACPI_ENABLE_EVENT);
 186         if (ACPI_FAILURE(status)) {
 187                 return_ACPI_STATUS(status);
 188         }
 189
 190         /* Make sure that the hardware responded */
 191
 192         status =
 193             acpi_read_bit_register(acpi_gbl_fixed_event_info[event].
 194                                    enable_register_id, &value);
 195         if (ACPI_FAILURE(status)) {
 196                 return_ACPI_STATUS(status);
 197         }
 198
 199         if (value != 1) {
 200                 ACPI_ERROR((AE_INFO,
 201                             "Could not enable %s event",
 202                             acpi_ut_get_event_name(event)));
 203                 return_ACPI_STATUS(AE_NO_HARDWARE_RESPONSE);
 204         }
 205
 206         return_ACPI_STATUS(status);
 207 }
 208
 209 ACPI_EXPORT_SYMBOL(acpi_enable_event)
 210
 211 /*******************************************************************************
 212  *
 213  * FUNCTION:    acpi_gpe_wakeup
 214  *
 215  * PARAMETERS:  gpe_device      - Parent GPE Device. NULL for GPE0/GPE1
 216  *              gpe_number      - GPE level within the GPE block
 217  *              Action          - Enable or Disable
 218  *
 219  * RETURN:      Status
 220  *
 221  * DESCRIPTION: Set or clear the GPE's wakeup enable mask bit.
 222  *
 223  ******************************************************************************/
 224 acpi_status acpi_gpe_wakeup(acpi_handle gpe_device, u32 gpe_number, u8 action)
 225 {
 226         acpi_status status = AE_OK;
 227         struct acpi_gpe_event_info *gpe_event_info;
 228         struct acpi_gpe_register_info *gpe_register_info;
 229         acpi_cpu_flags flags;
 230         u32 register_bit;
 231
 232         ACPI_FUNCTION_TRACE(acpi_gpe_wakeup);
 233
 234         flags = acpi_os_acquire_lock(acpi_gbl_gpe_lock);
 235
 236         /* Ensure that we have a valid GPE number */
 237
 238         gpe_event_info = acpi_ev_get_gpe_event_info(gpe_device, gpe_number);
 239         if (!gpe_event_info) {
 240                 status = AE_BAD_PARAMETER;
 241                 goto unlock_and_exit;
 242         }
 243
 244         gpe_register_info = gpe_event_info->register_info;
 245         if (!gpe_register_info) {
 246                 status = AE_NOT_EXIST;
 247                 goto unlock_and_exit;
 248         }
 249
 250         register_bit =
 251             acpi_hw_get_gpe_register_bit(gpe_event_info, gpe_register_info);
 252
 253         /* Perform the action */
 254
 255         switch (action) {
 256         case ACPI_GPE_ENABLE:
 257                 ACPI_SET_BIT(gpe_register_info->enable_for_wake,
 258                              (u8)register_bit);
 259                 break;
 260
 261         case ACPI_GPE_DISABLE:
 262                 ACPI_CLEAR_BIT(gpe_register_info->enable_for_wake,
 263                                (u8)register_bit);
 264                 break;
 265
 266         default:
 267                 ACPI_ERROR((AE_INFO, "%u, Invalid action", action));
 268                 status = AE_BAD_PARAMETER;
 269                 break;
 270         }
 271
 272 unlock_and_exit:
 273         acpi_os_release_lock(acpi_gbl_gpe_lock, flags);
 274         return_ACPI_STATUS(status);
 275 }
 276
 277 ACPI_EXPORT_SYMBOL(acpi_gpe_wakeup)
 278
 279 /*******************************************************************************
 280  *
 281  * FUNCTION:    acpi_enable_gpe
 282  *
 283  * PARAMETERS:  gpe_device      - Parent GPE Device. NULL for GPE0/GPE1
 284  *              gpe_number      - GPE level within the GPE block
 285  *
 286  * RETURN:      Status
 287  *
 288  * DESCRIPTION: Add a reference to a GPE. On the first reference, the GPE is
 289  *              hardware-enabled.
 290  *
 291  ******************************************************************************/
 292 acpi_status acpi_enable_gpe(acpi_handle gpe_device, u32 gpe_number)
 293 {
 294         acpi_status status = AE_OK;
 295         struct acpi_gpe_event_info *gpe_event_info;
 296         acpi_cpu_flags flags;
 297
 298         ACPI_FUNCTION_TRACE(acpi_enable_gpe);
 299
 300         flags = acpi_os_acquire_lock(acpi_gbl_gpe_lock);
 301
 302         /* Ensure that we have a valid GPE number */
 303
 304         gpe_event_info = acpi_ev_get_gpe_event_info(gpe_device, gpe_number);
 305         if (!gpe_event_info) {
 306                 status = AE_BAD_PARAMETER;
 307                 goto unlock_and_exit;
 308         }
 309
 310         if (gpe_event_info->runtime_count == ACPI_UINT8_MAX) {
 311                 status = AE_LIMIT;      /* Too many references */
 312                 goto unlock_and_exit;
 313         }
 314
 315         gpe_event_info->runtime_count++;
 316         if (gpe_event_info->runtime_count == 1) {
 317                 status = acpi_ev_update_gpe_enable_mask(gpe_event_info);
 318                 if (ACPI_SUCCESS(status)) {
 319                         status = acpi_ev_enable_gpe(gpe_event_info);
 320                 }
 321                 if (ACPI_FAILURE(status)) {
 322                         gpe_event_info->runtime_count--;
 323                 }
 324         }
 325
 326 unlock_and_exit:
 327         acpi_os_release_lock(acpi_gbl_gpe_lock, flags);
 328         return_ACPI_STATUS(status);
 329 }
 330 ACPI_EXPORT_SYMBOL(acpi_enable_gpe)
 331
 332 /*******************************************************************************
 333  *
 334  * FUNCTION:    acpi_disable_gpe
 335  *
 336  * PARAMETERS:  gpe_device      - Parent GPE Device. NULL for GPE0/GPE1
 337  *              gpe_number      - GPE level within the GPE block
 338  *
 339  * RETURN:      Status
 340  *
 341  * DESCRIPTION: Remove a reference to a GPE. When the last reference is
 342  *              removed, only then is the GPE disabled (for runtime GPEs), or
 343  *              the GPE mask bit disabled (for wake GPEs)
 344  *
 345  ******************************************************************************/
 346 acpi_status acpi_disable_gpe(acpi_handle gpe_device, u32 gpe_number)
 347 {
 348         acpi_status status = AE_OK;
 349         struct acpi_gpe_event_info *gpe_event_info;
 350         acpi_cpu_flags flags;
 351
 352         ACPI_FUNCTION_TRACE(acpi_disable_gpe);
 353
 354         flags = acpi_os_acquire_lock(acpi_gbl_gpe_lock);
 355
 356         /* Ensure that we have a valid GPE number */
 357
 358         gpe_event_info = acpi_ev_get_gpe_event_info(gpe_device, gpe_number);
 359         if (!gpe_event_info) {
 360                 status = AE_BAD_PARAMETER;
 361                 goto unlock_and_exit;
 362         }
 363
 364         /* Hardware-disable a runtime GPE on removal of the last reference */
 365
 366         if (!gpe_event_info->runtime_count) {
 367                 status = AE_LIMIT;      /* There are no references to remove */
 368                 goto unlock_and_exit;
 369         }
 370
 371         gpe_event_info->runtime_count--;
 372         if (!gpe_event_info->runtime_count) {
 373                 status = acpi_ev_update_gpe_enable_mask(gpe_event_info);
 374                 if (ACPI_SUCCESS(status)) {
 375                         status =
 376                             acpi_hw_low_set_gpe(gpe_event_info,
 377                                                 ACPI_GPE_DISABLE);
 378                 }
 379                 if (ACPI_FAILURE(status)) {
 380                         gpe_event_info->runtime_count++;
 381                 }
 382         }
 383
 384 unlock_and_exit:
 385         acpi_os_release_lock(acpi_gbl_gpe_lock, flags);
 386         return_ACPI_STATUS(status);
 387 }
 388 ACPI_EXPORT_SYMBOL(acpi_disable_gpe)
 389
 390 /*******************************************************************************
 391  *
 392  * FUNCTION:    acpi_gpe_can_wake
 393  *
 394  * PARAMETERS:  gpe_device      - Parent GPE Device. NULL for GPE0/GPE1
 395  *              gpe_number      - GPE level within the GPE block
 396  *
 397  * RETURN:      Status
 398  *
 399  * DESCRIPTION: Set the ACPI_GPE_CAN_WAKE flag for the given GPE.  If the GPE
 400  *              has a corresponding method and is currently enabled, disable it
 401  *              (GPEs with corresponding methods are enabled unconditionally
 402  *              during initialization, but GPEs that can wake up are expected
 403  *              to be initially disabled).
 404  *
 405  ******************************************************************************/
 406 acpi_status acpi_gpe_can_wake(acpi_handle gpe_device, u32 gpe_number)
 407 {
 408         acpi_status status = AE_OK;
 409         struct acpi_gpe_event_info *gpe_event_info;
 410         acpi_cpu_flags flags;
 411         u8 disable = 0;
 412
 413         ACPI_FUNCTION_TRACE(acpi_gpe_can_wake);
 414
 415         flags = acpi_os_acquire_lock(acpi_gbl_gpe_lock);
 416
 417         /* Ensure that we have a valid GPE number */
 418
 419         gpe_event_info = acpi_ev_get_gpe_event_info(gpe_device, gpe_number);
 420         if (!gpe_event_info) {
 421                 status = AE_BAD_PARAMETER;
 422                 goto unlock_and_exit;
 423         }
 424
 425         if (gpe_event_info->flags & ACPI_GPE_CAN_WAKE) {
 426                 goto unlock_and_exit;
 427         }
 428
 429         gpe_event_info->flags |= ACPI_GPE_CAN_WAKE;
 430         disable = (gpe_event_info->flags & ACPI_GPE_DISPATCH_METHOD)
 431                 && gpe_event_info->runtime_count;
 432
 433 unlock_and_exit:
 434         acpi_os_release_lock(acpi_gbl_gpe_lock, flags);
 435
 436         if (disable)
 437                 status = acpi_disable_gpe(gpe_device, gpe_number);
 438
 439         return_ACPI_STATUS(status);
 440 }
 441 ACPI_EXPORT_SYMBOL(acpi_gpe_can_wake)
 442
 443 /*******************************************************************************
 444  *
 445  * FUNCTION:    acpi_disable_event
 446  *
 447  * PARAMETERS:  Event           - The fixed eventto be enabled
 448  *              Flags           - Reserved
 449  *
 450  * RETURN:      Status
 451  *
 452  * DESCRIPTION: Disable an ACPI event (fixed)
 453  *
 454  ******************************************************************************/
 455 acpi_status acpi_disable_event(u32 event, u32 flags)
 456 {
 457         acpi_status status = AE_OK;
 458         u32 value;
 459
 460         ACPI_FUNCTION_TRACE(acpi_disable_event);
 461
 462         /* Decode the Fixed Event */
 463
 464         if (event > ACPI_EVENT_MAX) {
 465                 return_ACPI_STATUS(AE_BAD_PARAMETER);
 466         }
 467
 468         /*
 469          * Disable the requested fixed event (by writing a zero to the enable
 470          * register bit)
 471          */
 472         status =
 473             acpi_write_bit_register(acpi_gbl_fixed_event_info[event].
 474                                     enable_register_id, ACPI_DISABLE_EVENT);
 475         if (ACPI_FAILURE(status)) {
 476                 return_ACPI_STATUS(status);
 477         }
 478
 479         status =
 480             acpi_read_bit_register(acpi_gbl_fixed_event_info[event].
 481                                    enable_register_id, &value);
 482         if (ACPI_FAILURE(status)) {
 483                 return_ACPI_STATUS(status);
 484         }
 485
 486         if (value != 0) {
 487                 ACPI_ERROR((AE_INFO,
 488                             "Could not disable %s events",
 489                             acpi_ut_get_event_name(event)));
 490                 return_ACPI_STATUS(AE_NO_HARDWARE_RESPONSE);
 491         }
 492
 493         return_ACPI_STATUS(status);
 494 }
 495
 496 ACPI_EXPORT_SYMBOL(acpi_disable_event)
 497
 498 /*******************************************************************************
 499  *
 500  * FUNCTION:    acpi_clear_event
 501  *
 502  * PARAMETERS:  Event           - The fixed event to be cleared
 503  *
 504  * RETURN:      Status
 505  *
 506  * DESCRIPTION: Clear an ACPI event (fixed)
 507  *
 508  ******************************************************************************/
 509 acpi_status acpi_clear_event(u32 event)
 510 {
 511         acpi_status status = AE_OK;
 512
 513         ACPI_FUNCTION_TRACE(acpi_clear_event);
 514
 515         /* Decode the Fixed Event */
 516
 517         if (event > ACPI_EVENT_MAX) {
 518                 return_ACPI_STATUS(AE_BAD_PARAMETER);
 519         }
 520
 521         /*
 522          * Clear the requested fixed event (By writing a one to the status
 523          * register bit)
 524          */
 525         status =
 526             acpi_write_bit_register(acpi_gbl_fixed_event_info[event].
 527                                     status_register_id, ACPI_CLEAR_STATUS);
 528
 529         return_ACPI_STATUS(status);
 530 }
 531
 532 ACPI_EXPORT_SYMBOL(acpi_clear_event)
 533
 534 /*******************************************************************************
 535  *
 536  * FUNCTION:    acpi_clear_gpe
 537  *
 538  * PARAMETERS:  gpe_device      - Parent GPE Device. NULL for GPE0/GPE1
 539  *              gpe_number      - GPE level within the GPE block
 540  *
 541  * RETURN:      Status
 542  *
 543  * DESCRIPTION: Clear an ACPI event (general purpose)
 544  *
 545  ******************************************************************************/
 546 acpi_status acpi_clear_gpe(acpi_handle gpe_device, u32 gpe_number)
 547 {
 548         acpi_status status = AE_OK;
 549         struct acpi_gpe_event_info *gpe_event_info;
 550         acpi_cpu_flags flags;
 551
 552         ACPI_FUNCTION_TRACE(acpi_clear_gpe);
 553
 554         flags = acpi_os_acquire_lock(acpi_gbl_gpe_lock);
 555
 556         /* Ensure that we have a valid GPE number */
 557
 558         gpe_event_info = acpi_ev_get_gpe_event_info(gpe_device, gpe_number);
 559         if (!gpe_event_info) {
 560                 status = AE_BAD_PARAMETER;
 561                 goto unlock_and_exit;
 562         }
 563
 564         status = acpi_hw_clear_gpe(gpe_event_info);
 565
 566       unlock_and_exit:
 567         acpi_os_release_lock(acpi_gbl_gpe_lock, flags);
 568         return_ACPI_STATUS(status);
 569 }
 570
 571 ACPI_EXPORT_SYMBOL(acpi_clear_gpe)
 572 /*******************************************************************************
 573  *
 574  * FUNCTION:    acpi_get_event_status
 575  *
 576  * PARAMETERS:  Event           - The fixed event
 577  *              event_status    - Where the current status of the event will
 578  *                                be returned
 579  *
 580  * RETURN:      Status
 581  *
 582  * DESCRIPTION: Obtains and returns the current status of the event
 583  *
 584  ******************************************************************************/
 585 acpi_status acpi_get_event_status(u32 event, acpi_event_status * event_status)
 586 {
 587         acpi_status status = AE_OK;
 588         u32 value;
 589
 590         ACPI_FUNCTION_TRACE(acpi_get_event_status);
 591
 592         if (!event_status) {
 593                 return_ACPI_STATUS(AE_BAD_PARAMETER);
 594         }
 595
 596         /* Decode the Fixed Event */
 597
 598         if (event > ACPI_EVENT_MAX) {
 599                 return_ACPI_STATUS(AE_BAD_PARAMETER);
 600         }
 601
 602         /* Get the status of the requested fixed event */
 603
 604         status =
 605             acpi_read_bit_register(acpi_gbl_fixed_event_info[event].
 606                               enable_register_id, &value);
 607         if (ACPI_FAILURE(status))
 608                 return_ACPI_STATUS(status);
 609
 610         *event_status = value;
 611
 612         status =
 613             acpi_read_bit_register(acpi_gbl_fixed_event_info[event].
 614                               status_register_id, &value);
 615         if (ACPI_FAILURE(status))
 616                 return_ACPI_STATUS(status);
 617
 618         if (value)
 619                 *event_status |= ACPI_EVENT_FLAG_SET;
 620
 621         if (acpi_gbl_fixed_event_handlers[event].handler)
 622                 *event_status |= ACPI_EVENT_FLAG_HANDLE;
 623
 624         return_ACPI_STATUS(status);
 625 }
 626
 627 ACPI_EXPORT_SYMBOL(acpi_get_event_status)
 628
 629 /*******************************************************************************
 630  *
 631  * FUNCTION:    acpi_get_gpe_status
 632  *
 633  * PARAMETERS:  gpe_device      - Parent GPE Device. NULL for GPE0/GPE1
 634  *              gpe_number      - GPE level within the GPE block
 635  *              event_status    - Where the current status of the event will
 636  *                                be returned
 637  *
 638  * RETURN:      Status
 639  *
 640  * DESCRIPTION: Get status of an event (general purpose)
 641  *
 642  ******************************************************************************/
 643 acpi_status
 644 acpi_get_gpe_status(acpi_handle gpe_device,
 645                     u32 gpe_number, acpi_event_status *event_status)
 646 {
 647         acpi_status status = AE_OK;
 648         struct acpi_gpe_event_info *gpe_event_info;
 649         acpi_cpu_flags flags;
 650
 651         ACPI_FUNCTION_TRACE(acpi_get_gpe_status);
 652
 653         flags = acpi_os_acquire_lock(acpi_gbl_gpe_lock);
 654
 655         /* Ensure that we have a valid GPE number */
 656
 657         gpe_event_info = acpi_ev_get_gpe_event_info(gpe_device, gpe_number);
 658         if (!gpe_event_info) {
 659                 status = AE_BAD_PARAMETER;
 660                 goto unlock_and_exit;
 661         }
 662
 663         /* Obtain status on the requested GPE number */
 664
 665         status = acpi_hw_get_gpe_status(gpe_event_info, event_status);
 666
 667         if (gpe_event_info->flags & ACPI_GPE_DISPATCH_MASK)
 668                 *event_status |= ACPI_EVENT_FLAG_HANDLE;
 669
 670       unlock_and_exit:
 671         acpi_os_release_lock(acpi_gbl_gpe_lock, flags);
 672         return_ACPI_STATUS(status);
 673 }
 674
 675 ACPI_EXPORT_SYMBOL(acpi_get_gpe_status)
 676 /*******************************************************************************
 677  *
 678  * FUNCTION:    acpi_install_gpe_block
 679  *
 680  * PARAMETERS:  gpe_device          - Handle to the parent GPE Block Device
 681  *              gpe_block_address   - Address and space_iD
 682  *              register_count      - Number of GPE register pairs in the block
 683  *              interrupt_number    - H/W interrupt for the block
 684  *
 685  * RETURN:      Status
 686  *
 687  * DESCRIPTION: Create and Install a block of GPE registers
 688  *
 689  ******************************************************************************/
 690 acpi_status
 691 acpi_install_gpe_block(acpi_handle gpe_device,
 692                        struct acpi_generic_address *gpe_block_address,
 693                        u32 register_count, u32 interrupt_number)
 694 {
 695         acpi_status status;
 696         union acpi_operand_object *obj_desc;
 697         struct acpi_namespace_node *node;
 698         struct acpi_gpe_block_info *gpe_block;
 699
 700         ACPI_FUNCTION_TRACE(acpi_install_gpe_block);
 701
 702         if ((!gpe_device) || (!gpe_block_address) || (!register_count)) {
 703                 return_ACPI_STATUS(AE_BAD_PARAMETER);
 704         }
 705
 706         status = acpi_ut_acquire_mutex(ACPI_MTX_NAMESPACE);
 707         if (ACPI_FAILURE(status)) {
 708                 return (status);
 709         }
 710
 711         node = acpi_ns_validate_handle(gpe_device);
 712         if (!node) {
 713                 status = AE_BAD_PARAMETER;
 714                 goto unlock_and_exit;
 715         }
 716
 717         /*
 718          * For user-installed GPE Block Devices, the gpe_block_base_number
 719          * is always zero
 720          */
 721         status =
 722             acpi_ev_create_gpe_block(node, gpe_block_address, register_count, 0,
 723                                      interrupt_number, &gpe_block);
 724         if (ACPI_FAILURE(status)) {
 725                 goto unlock_and_exit;
 726         }
 727
 728         /* Install block in the device_object attached to the node */
 729
 730         obj_desc = acpi_ns_get_attached_object(node);
 731         if (!obj_desc) {
 732
 733                 /*
 734                  * No object, create a new one (Device nodes do not always have
 735                  * an attached object)
 736                  */
 737                 obj_desc = acpi_ut_create_internal_object(ACPI_TYPE_DEVICE);
 738                 if (!obj_desc) {
 739                         status = AE_NO_MEMORY;
 740                         goto unlock_and_exit;
 741                 }
 742
 743                 status =
 744                     acpi_ns_attach_object(node, obj_desc, ACPI_TYPE_DEVICE);
 745
 746                 /* Remove local reference to the object */
 747
 748                 acpi_ut_remove_reference(obj_desc);
 749
 750                 if (ACPI_FAILURE(status)) {
 751                         goto unlock_and_exit;
 752                 }
 753         }
 754
 755         /* Now install the GPE block in the device_object */
 756
 757         obj_desc->device.gpe_block = gpe_block;
 758
 759         /* Enable the runtime GPEs in the new block */
 760
 761         status = acpi_ev_initialize_gpe_block(node, gpe_block);
 762
 763       unlock_and_exit:
 764         (void)acpi_ut_release_mutex(ACPI_MTX_NAMESPACE);
 765         return_ACPI_STATUS(status);
 766 }
 767
 768 ACPI_EXPORT_SYMBOL(acpi_install_gpe_block)
 769
 770 /*******************************************************************************
 771  *
 772  * FUNCTION:    acpi_remove_gpe_block
 773  *
 774  * PARAMETERS:  gpe_device          - Handle to the parent GPE Block Device
 775  *
 776  * RETURN:      Status
 777  *
 778  * DESCRIPTION: Remove a previously installed block of GPE registers
 779  *
 780  ******************************************************************************/
 781 acpi_status acpi_remove_gpe_block(acpi_handle gpe_device)
 782 {
 783         union acpi_operand_object *obj_desc;
 784         acpi_status status;
 785         struct acpi_namespace_node *node;
 786
 787         ACPI_FUNCTION_TRACE(acpi_remove_gpe_block);
 788
 789         if (!gpe_device) {
 790                 return_ACPI_STATUS(AE_BAD_PARAMETER);
 791         }
 792
 793         status = acpi_ut_acquire_mutex(ACPI_MTX_NAMESPACE);
 794         if (ACPI_FAILURE(status)) {
 795                 return (status);
 796         }
 797
 798         node = acpi_ns_validate_handle(gpe_device);
 799         if (!node) {
 800                 status = AE_BAD_PARAMETER;
 801                 goto unlock_and_exit;
 802         }
 803
 804         /* Get the device_object attached to the node */
 805
 806         obj_desc = acpi_ns_get_attached_object(node);
 807         if (!obj_desc || !obj_desc->device.gpe_block) {
 808                 return_ACPI_STATUS(AE_NULL_OBJECT);
 809         }
 810
 811         /* Delete the GPE block (but not the device_object) */
 812
 813         status = acpi_ev_delete_gpe_block(obj_desc->device.gpe_block);
 814         if (ACPI_SUCCESS(status)) {
 815                 obj_desc->device.gpe_block = NULL;
 816         }
 817
 818       unlock_and_exit:
 819         (void)acpi_ut_release_mutex(ACPI_MTX_NAMESPACE);
 820         return_ACPI_STATUS(status);
 821 }
 822
 823 ACPI_EXPORT_SYMBOL(acpi_remove_gpe_block)
 824
 825 /*******************************************************************************
 826  *
 827  * FUNCTION:    acpi_get_gpe_device
 828  *
 829  * PARAMETERS:  Index               - System GPE index (0-current_gpe_count)
 830  *              gpe_device          - Where the parent GPE Device is returned
 831  *
 832  * RETURN:      Status
 833  *
 834  * DESCRIPTION: Obtain the GPE device associated with the input index. A NULL
 835  *              gpe device indicates that the gpe number is contained in one of
 836  *              the FADT-defined gpe blocks. Otherwise, the GPE block device.
 837  *
 838  ******************************************************************************/
 839 acpi_status
 840 acpi_get_gpe_device(u32 index, acpi_handle *gpe_device)
 841 {
 842         struct acpi_gpe_device_info info;
 843         acpi_status status;
 844
 845         ACPI_FUNCTION_TRACE(acpi_get_gpe_device);
 846
 847         if (!gpe_device) {
 848                 return_ACPI_STATUS(AE_BAD_PARAMETER);
 849         }
 850
 851         if (index >= acpi_current_gpe_count) {
 852                 return_ACPI_STATUS(AE_NOT_EXIST);
 853         }
 854
 855         /* Setup and walk the GPE list */
 856
 857         info.index = index;
 858         info.status = AE_NOT_EXIST;
 859         info.gpe_device = NULL;
 860         info.next_block_base_index = 0;
 861
 862         status = acpi_ev_walk_gpe_list(acpi_ev_get_gpe_device, &info);
 863         if (ACPI_FAILURE(status)) {
 864                 return_ACPI_STATUS(status);
 865         }
 866
 867         *gpe_device = info.gpe_device;
 868         return_ACPI_STATUS(info.status);
 869 }
 870
 871 ACPI_EXPORT_SYMBOL(acpi_get_gpe_device)
 872
 873 /*******************************************************************************
 874  *
 875  * FUNCTION:    acpi_ev_get_gpe_device
 876  *
 877  * PARAMETERS:  GPE_WALK_CALLBACK
 878  *
 879  * RETURN:      Status
 880  *
 881  * DESCRIPTION: Matches the input GPE index (0-current_gpe_count) with a GPE
 882  *              block device. NULL if the GPE is one of the FADT-defined GPEs.
 883  *
 884  ******************************************************************************/
 885 static acpi_status
 886 acpi_ev_get_gpe_device(struct acpi_gpe_xrupt_info *gpe_xrupt_info,
 887                        struct acpi_gpe_block_info *gpe_block, void *context)
 888 {
 889         struct acpi_gpe_device_info *info = context;
 890
 891         /* Increment Index by the number of GPEs in this block */
 892
 893         info->next_block_base_index += gpe_block->gpe_count;
 894
 895         if (info->index < info->next_block_base_index) {
 896                 /*
 897                  * The GPE index is within this block, get the node. Leave the node
 898                  * NULL for the FADT-defined GPEs
 899                  */
 900                 if ((gpe_block->node)->type == ACPI_TYPE_DEVICE) {
 901                         info->gpe_device = gpe_block->node;
 902                 }
 903
 904                 info->status = AE_OK;
 905                 return (AE_CTRL_END);
 906         }
 907
 908         return (AE_OK);
 909 }
 910
 911 /******************************************************************************
 912  *
 913  * FUNCTION:    acpi_disable_all_gpes
 914  *
 915  * PARAMETERS:  None
 916  *
 917  * RETURN:      Status
 918  *
 919  * DESCRIPTION: Disable and clear all GPEs in all GPE blocks
 920  *
 921  ******************************************************************************/
 922
 923 acpi_status acpi_disable_all_gpes(void)
 924 {
 925         acpi_status status;
 926
 927         ACPI_FUNCTION_TRACE(acpi_disable_all_gpes);
 928
 929         status = acpi_ut_acquire_mutex(ACPI_MTX_EVENTS);
 930         if (ACPI_FAILURE(status)) {
 931                 return_ACPI_STATUS(status);
 932         }
 933
 934         status = acpi_hw_disable_all_gpes();
 935         (void)acpi_ut_release_mutex(ACPI_MTX_EVENTS);
 936
 937         return_ACPI_STATUS(status);
 938 }
 939
 940 /******************************************************************************
 941  *
 942  * FUNCTION:    acpi_enable_all_runtime_gpes
 943  *
 944  * PARAMETERS:  None
 945  *
 946  * RETURN:      Status
 947  *
 948  * DESCRIPTION: Enable all "runtime" GPEs, in all GPE blocks
 949  *
 950  ******************************************************************************/
 951
 952 acpi_status acpi_enable_all_runtime_gpes(void)
 953 {
 954         acpi_status status;
 955
 956         ACPI_FUNCTION_TRACE(acpi_enable_all_runtime_gpes);
 957
 958         status = acpi_ut_acquire_mutex(ACPI_MTX_EVENTS);
 959         if (ACPI_FAILURE(status)) {
 960                 return_ACPI_STATUS(status);
 961         }
 962
 963         status = acpi_hw_enable_all_runtime_gpes();
 964         (void)acpi_ut_release_mutex(ACPI_MTX_EVENTS);
 965
 966         return_ACPI_STATUS(status);
 967 }