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