drivers/acpi/events/evmisc.c

   1 /******************************************************************************
   2  *
   3  * Module Name: evmisc - Miscellaneous event manager support functions
   4  *
   5  *****************************************************************************/
   6
   7 /*
   8  * Copyright (C) 2000 - 2004, R. Byron Moore
   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 <acpi/acevents.h>
  46 #include <acpi/acnamesp.h>
  47 #include <acpi/acinterp.h>
  48
  49 #define _COMPONENT          ACPI_EVENTS
  50          ACPI_MODULE_NAME    ("evmisc")
  51
  52
  53 /*******************************************************************************
  54  *
  55  * FUNCTION:    acpi_ev_is_notify_object
  56  *
  57  * PARAMETERS:  Node            - Node to check
  58  *
  59  * RETURN:      TRUE if notifies allowed on this object
  60  *
  61  * DESCRIPTION: Check type of node for a object that supports notifies.
  62  *
  63  *              TBD: This could be replaced by a flag bit in the node.
  64  *
  65  ******************************************************************************/
  66
  67 u8
  68 acpi_ev_is_notify_object (
  69         struct acpi_namespace_node      *node)
  70 {
  71         switch (node->type) {
  72         case ACPI_TYPE_DEVICE:
  73         case ACPI_TYPE_PROCESSOR:
  74         case ACPI_TYPE_POWER:
  75         case ACPI_TYPE_THERMAL:
  76                 /*
  77                  * These are the ONLY objects that can receive ACPI notifications
  78                  */
  79                 return (TRUE);
  80
  81         default:
  82                 return (FALSE);
  83         }
  84 }
  85
  86
  87 /*******************************************************************************
  88  *
  89  * FUNCTION:    acpi_ev_queue_notify_request
  90  *
  91  * PARAMETERS:  Node            - NS node for the notified object
  92  *              notify_value    - Value from the Notify() request
  93  *
  94  * RETURN:      Status
  95  *
  96  * DESCRIPTION: Dispatch a device notification event to a previously
  97  *              installed handler.
  98  *
  99  ******************************************************************************/
 100
 101 #ifdef ACPI_DEBUG_OUTPUT
 102 static const char                *acpi_notify_value_names[] =
 103 {
 104         "Bus Check",
 105         "Device Check",
 106         "Device Wake",
 107         "Eject request",
 108         "Device Check Light",
 109         "Frequency Mismatch",
 110         "Bus Mode Mismatch",
 111         "Power Fault"
 112 };
 113 #endif
 114
 115 acpi_status
 116 acpi_ev_queue_notify_request (
 117         struct acpi_namespace_node      *node,
 118         u32                             notify_value)
 119 {
 120         union acpi_operand_object       *obj_desc;
 121         union acpi_operand_object       *handler_obj = NULL;
 122         union acpi_generic_state        *notify_info;
 123         acpi_status                     status = AE_OK;
 124
 125
 126         ACPI_FUNCTION_NAME ("ev_queue_notify_request");
 127
 128
 129         /*
 130          * For value 3 (Ejection Request), some device method may need to be run.
 131          * For value 2 (Device Wake) if _PRW exists, the _PS0 method may need to be run.
 132          * For value 0x80 (Status Change) on the power button or sleep button,
 133          * initiate soft-off or sleep operation?
 134          */
 135         ACPI_DEBUG_PRINT ((ACPI_DB_INFO,
 136                 "Dispatching Notify(%X) on node %p\n", notify_value, node));
 137
 138         if (notify_value <= 7) {
 139                 ACPI_DEBUG_PRINT ((ACPI_DB_INFO, "Notify value: %s\n",
 140                                 acpi_notify_value_names[notify_value]));
 141         }
 142         else {
 143                 ACPI_DEBUG_PRINT ((ACPI_DB_INFO, "Notify value: 0x%2.2X **Device Specific**\n",
 144                                 notify_value));
 145         }
 146
 147         /* Get the notify object attached to the NS Node */
 148
 149         obj_desc = acpi_ns_get_attached_object (node);
 150         if (obj_desc) {
 151                 /* We have the notify object, Get the right handler */
 152
 153                 switch (node->type) {
 154                 case ACPI_TYPE_DEVICE:
 155                 case ACPI_TYPE_THERMAL:
 156                 case ACPI_TYPE_PROCESSOR:
 157                 case ACPI_TYPE_POWER:
 158
 159                         if (notify_value <= ACPI_MAX_SYS_NOTIFY) {
 160                                 handler_obj = obj_desc->common_notify.system_notify;
 161                         }
 162                         else {
 163                                 handler_obj = obj_desc->common_notify.device_notify;
 164                         }
 165                         break;
 166
 167                 default:
 168                         /* All other types are not supported */
 169                         return (AE_TYPE);
 170                 }
 171         }
 172
 173         /* If there is any handler to run, schedule the dispatcher */
 174
 175         if ((acpi_gbl_system_notify.handler && (notify_value <= ACPI_MAX_SYS_NOTIFY)) ||
 176                 (acpi_gbl_device_notify.handler && (notify_value > ACPI_MAX_SYS_NOTIFY)) ||
 177                 handler_obj) {
 178                 notify_info = acpi_ut_create_generic_state ();
 179                 if (!notify_info) {
 180                         return (AE_NO_MEMORY);
 181                 }
 182
 183                 notify_info->common.data_type = ACPI_DESC_TYPE_STATE_NOTIFY;
 184                 notify_info->notify.node      = node;
 185                 notify_info->notify.value     = (u16) notify_value;
 186                 notify_info->notify.handler_obj = handler_obj;
 187
 188                 status = acpi_os_queue_for_execution (OSD_PRIORITY_HIGH,
 189                                   acpi_ev_notify_dispatch, notify_info);
 190                 if (ACPI_FAILURE (status)) {
 191                         acpi_ut_delete_generic_state (notify_info);
 192                 }
 193         }
 194
 195         if (!handler_obj) {
 196                 /*
 197                  * There is no per-device notify handler for this device.
 198                  * This may or may not be a problem.
 199                  */
 200                 ACPI_DEBUG_PRINT ((ACPI_DB_INFO,
 201                         "No notify handler for Notify(%4.4s, %X) node %p\n",
 202                         acpi_ut_get_node_name (node), notify_value, node));
 203         }
 204
 205         return (status);
 206 }
 207
 208
 209 /*******************************************************************************
 210  *
 211  * FUNCTION:    acpi_ev_notify_dispatch
 212  *
 213  * PARAMETERS:  Context         - To be passsed to the notify handler
 214  *
 215  * RETURN:      None.
 216  *
 217  * DESCRIPTION: Dispatch a device notification event to a previously
 218  *              installed handler.
 219  *
 220  ******************************************************************************/
 221
 222 void ACPI_SYSTEM_XFACE
 223 acpi_ev_notify_dispatch (
 224         void                            *context)
 225 {
 226         union acpi_generic_state        *notify_info = (union acpi_generic_state *) context;
 227         acpi_notify_handler             global_handler = NULL;
 228         void                            *global_context = NULL;
 229         union acpi_operand_object       *handler_obj;
 230
 231
 232         ACPI_FUNCTION_ENTRY ();
 233
 234
 235         /*
 236          * We will invoke a global notify handler if installed.
 237          * This is done _before_ we invoke the per-device handler attached to the device.
 238          */
 239         if (notify_info->notify.value <= ACPI_MAX_SYS_NOTIFY) {
 240                 /* Global system notification handler */
 241
 242                 if (acpi_gbl_system_notify.handler) {
 243                         global_handler = acpi_gbl_system_notify.handler;
 244                         global_context = acpi_gbl_system_notify.context;
 245                 }
 246         }
 247         else {
 248                 /* Global driver notification handler */
 249
 250                 if (acpi_gbl_device_notify.handler) {
 251                         global_handler = acpi_gbl_device_notify.handler;
 252                         global_context = acpi_gbl_device_notify.context;
 253                 }
 254         }
 255
 256         /* Invoke the system handler first, if present */
 257
 258         if (global_handler) {
 259                 global_handler (notify_info->notify.node, notify_info->notify.value, global_context);
 260         }
 261
 262         /* Now invoke the per-device handler, if present */
 263
 264         handler_obj = notify_info->notify.handler_obj;
 265         if (handler_obj) {
 266                 handler_obj->notify.handler (notify_info->notify.node, notify_info->notify.value,
 267                                   handler_obj->notify.context);
 268         }
 269
 270         /* All done with the info object */
 271
 272         acpi_ut_delete_generic_state (notify_info);
 273 }
 274
 275
 276 /*******************************************************************************
 277  *
 278  * FUNCTION:    acpi_ev_global_lock_thread
 279  *
 280  * PARAMETERS:  Context         - From thread interface, not used
 281  *
 282  * RETURN:      None
 283  *
 284  * DESCRIPTION: Invoked by SCI interrupt handler upon acquisition of the
 285  *              Global Lock.  Simply signal all threads that are waiting
 286  *              for the lock.
 287  *
 288  ******************************************************************************/
 289
 290 static void ACPI_SYSTEM_XFACE
 291 acpi_ev_global_lock_thread (
 292         void                            *context)
 293 {
 294         acpi_status                     status;
 295
 296
 297         /* Signal threads that are waiting for the lock */
 298
 299         if (acpi_gbl_global_lock_thread_count) {
 300                 /* Send sufficient units to the semaphore */
 301
 302                 status = acpi_os_signal_semaphore (acpi_gbl_global_lock_semaphore,
 303                                  acpi_gbl_global_lock_thread_count);
 304                 if (ACPI_FAILURE (status)) {
 305                         ACPI_REPORT_ERROR (("Could not signal Global Lock semaphore\n"));
 306                 }
 307         }
 308 }
 309
 310
 311 /*******************************************************************************
 312  *
 313  * FUNCTION:    acpi_ev_global_lock_handler
 314  *
 315  * PARAMETERS:  Context         - From thread interface, not used
 316  *
 317  * RETURN:      ACPI_INTERRUPT_HANDLED or ACPI_INTERRUPT_NOT_HANDLED
 318  *
 319  * DESCRIPTION: Invoked directly from the SCI handler when a global lock
 320  *              release interrupt occurs.  Grab the global lock and queue
 321  *              the global lock thread for execution
 322  *
 323  ******************************************************************************/
 324
 325 static u32
 326 acpi_ev_global_lock_handler (
 327         void                            *context)
 328 {
 329         u8                              acquired = FALSE;
 330         acpi_status                     status;
 331
 332
 333         /*
 334          * Attempt to get the lock
 335          * If we don't get it now, it will be marked pending and we will
 336          * take another interrupt when it becomes free.
 337          */
 338         ACPI_ACQUIRE_GLOBAL_LOCK (acpi_gbl_common_fACS.global_lock, acquired);
 339         if (acquired) {
 340                 /* Got the lock, now wake all threads waiting for it */
 341
 342                 acpi_gbl_global_lock_acquired = TRUE;
 343
 344                 /* Run the Global Lock thread which will signal all waiting threads */
 345
 346                 status = acpi_os_queue_for_execution (OSD_PRIORITY_HIGH,
 347                                   acpi_ev_global_lock_thread, context);
 348                 if (ACPI_FAILURE (status)) {
 349                         ACPI_REPORT_ERROR (("Could not queue Global Lock thread, %s\n",
 350                                 acpi_format_exception (status)));
 351
 352                         return (ACPI_INTERRUPT_NOT_HANDLED);
 353                 }
 354         }
 355
 356         return (ACPI_INTERRUPT_HANDLED);
 357 }
 358
 359
 360 /*******************************************************************************
 361  *
 362  * FUNCTION:    acpi_ev_init_global_lock_handler
 363  *
 364  * PARAMETERS:  None
 365  *
 366  * RETURN:      Status
 367  *
 368  * DESCRIPTION: Install a handler for the global lock release event
 369  *
 370  ******************************************************************************/
 371
 372 acpi_status
 373 acpi_ev_init_global_lock_handler (void)
 374 {
 375         acpi_status                     status;
 376
 377
 378         ACPI_FUNCTION_TRACE ("ev_init_global_lock_handler");
 379
 380
 381         acpi_gbl_global_lock_present = TRUE;
 382         status = acpi_install_fixed_event_handler (ACPI_EVENT_GLOBAL,
 383                           acpi_ev_global_lock_handler, NULL);
 384
 385         /*
 386          * If the global lock does not exist on this platform, the attempt
 387          * to enable GBL_STATUS will fail (the GBL_ENABLE bit will not stick)
 388          * Map to AE_OK, but mark global lock as not present.
 389          * Any attempt to actually use the global lock will be flagged
 390          * with an error.
 391          */
 392         if (status == AE_NO_HARDWARE_RESPONSE) {
 393                 acpi_gbl_global_lock_present = FALSE;
 394                 status = AE_OK;
 395         }
 396
 397         return_ACPI_STATUS (status);
 398 }
 399
 400
 401 /******************************************************************************
 402  *
 403  * FUNCTION:    acpi_ev_acquire_global_lock
 404  *
 405  * PARAMETERS:  Timeout         - Max time to wait for the lock, in millisec.
 406  *
 407  * RETURN:      Status
 408  *
 409  * DESCRIPTION: Attempt to gain ownership of the Global Lock.
 410  *
 411  *****************************************************************************/
 412
 413 acpi_status
 414 acpi_ev_acquire_global_lock (
 415         u16                             timeout)
 416 {
 417         acpi_status                     status = AE_OK;
 418         u8                              acquired = FALSE;
 419
 420
 421         ACPI_FUNCTION_TRACE ("ev_acquire_global_lock");
 422
 423
 424 #ifndef ACPI_APPLICATION
 425         /* Make sure that we actually have a global lock */
 426
 427         if (!acpi_gbl_global_lock_present) {
 428                 return_ACPI_STATUS (AE_NO_GLOBAL_LOCK);
 429         }
 430 #endif
 431
 432         /* One more thread wants the global lock */
 433
 434         acpi_gbl_global_lock_thread_count++;
 435
 436         /* If we (OS side vs. BIOS side) have the hardware lock already, we are done */
 437
 438         if (acpi_gbl_global_lock_acquired) {
 439                 return_ACPI_STATUS (AE_OK);
 440         }
 441
 442         /* We must acquire the actual hardware lock */
 443
 444         ACPI_ACQUIRE_GLOBAL_LOCK (acpi_gbl_common_fACS.global_lock, acquired);
 445         if (acquired) {
 446            /* We got the lock */
 447
 448                 ACPI_DEBUG_PRINT ((ACPI_DB_EXEC, "Acquired the HW Global Lock\n"));
 449
 450                 acpi_gbl_global_lock_acquired = TRUE;
 451                 return_ACPI_STATUS (AE_OK);
 452         }
 453
 454         /*
 455          * Did not get the lock.  The pending bit was set above, and we must now
 456          * wait until we get the global lock released interrupt.
 457          */
 458         ACPI_DEBUG_PRINT ((ACPI_DB_EXEC, "Waiting for the HW Global Lock\n"));
 459
 460         /*
 461          * Acquire the global lock semaphore first.
 462          * Since this wait will block, we must release the interpreter
 463          */
 464         status = acpi_ex_system_wait_semaphore (acpi_gbl_global_lock_semaphore,
 465                           timeout);
 466         return_ACPI_STATUS (status);
 467 }
 468
 469
 470 /*******************************************************************************
 471  *
 472  * FUNCTION:    acpi_ev_release_global_lock
 473  *
 474  * PARAMETERS:  None
 475  *
 476  * RETURN:      Status
 477  *
 478  * DESCRIPTION: Releases ownership of the Global Lock.
 479  *
 480  ******************************************************************************/
 481
 482 acpi_status
 483 acpi_ev_release_global_lock (void)
 484 {
 485         u8                              pending = FALSE;
 486         acpi_status                     status = AE_OK;
 487
 488
 489         ACPI_FUNCTION_TRACE ("ev_release_global_lock");
 490
 491
 492         if (!acpi_gbl_global_lock_thread_count) {
 493                 ACPI_REPORT_WARNING(("Cannot release HW Global Lock, it has not been acquired\n"));
 494                 return_ACPI_STATUS (AE_NOT_ACQUIRED);
 495         }
 496
 497         /* One fewer thread has the global lock */
 498
 499         acpi_gbl_global_lock_thread_count--;
 500         if (acpi_gbl_global_lock_thread_count) {
 501                 /* There are still some threads holding the lock, cannot release */
 502
 503                 return_ACPI_STATUS (AE_OK);
 504         }
 505
 506         /*
 507          * No more threads holding lock, we can do the actual hardware
 508          * release
 509          */
 510         ACPI_RELEASE_GLOBAL_LOCK (acpi_gbl_common_fACS.global_lock, pending);
 511         acpi_gbl_global_lock_acquired = FALSE;
 512
 513         /*
 514          * If the pending bit was set, we must write GBL_RLS to the control
 515          * register
 516          */
 517         if (pending) {
 518                 status = acpi_set_register (ACPI_BITREG_GLOBAL_LOCK_RELEASE, 1, ACPI_MTX_LOCK);
 519         }
 520
 521         return_ACPI_STATUS (status);
 522 }
 523
 524
 525 /******************************************************************************
 526  *
 527  * FUNCTION:    acpi_ev_terminate
 528  *
 529  * PARAMETERS:  none
 530  *
 531  * RETURN:      none
 532  *
 533  * DESCRIPTION: Disable events and free memory allocated for table storage.
 534  *
 535  ******************************************************************************/
 536
 537 void
 538 acpi_ev_terminate (void)
 539 {
 540         acpi_native_uint                i;
 541         acpi_status                     status;
 542
 543
 544         ACPI_FUNCTION_TRACE ("ev_terminate");
 545
 546
 547         if (acpi_gbl_events_initialized) {
 548                 /*
 549                  * Disable all event-related functionality.
 550                  * In all cases, on error, print a message but obviously we don't abort.
 551                  */
 552
 553                 /* Disable all fixed events */
 554
 555                 for (i = 0; i < ACPI_NUM_FIXED_EVENTS; i++) {
 556                         status = acpi_disable_event ((u32) i, 0);
 557                         if (ACPI_FAILURE (status)) {
 558                                 ACPI_DEBUG_PRINT ((ACPI_DB_ERROR, "Could not disable fixed event %d\n", (u32) i));
 559                         }
 560                 }
 561
 562                 /* Disable all GPEs in all GPE blocks */
 563
 564                 status = acpi_ev_walk_gpe_list (acpi_hw_disable_gpe_block, ACPI_NOT_ISR);
 565
 566                 /* Remove SCI handler */
 567
 568                 status = acpi_ev_remove_sci_handler ();
 569                 if (ACPI_FAILURE(status)) {
 570                         ACPI_DEBUG_PRINT ((ACPI_DB_ERROR, "Could not remove SCI handler\n"));
 571                 }
 572         }
 573
 574         /* Deallocate all handler objects installed within GPE info structs */
 575
 576         status = acpi_ev_walk_gpe_list (acpi_ev_delete_gpe_handlers, ACPI_NOT_ISR);
 577
 578         /* Return to original mode if necessary */
 579
 580         if (acpi_gbl_original_mode == ACPI_SYS_MODE_LEGACY) {
 581                 status = acpi_disable ();
 582                 if (ACPI_FAILURE (status)) {
 583                         ACPI_DEBUG_PRINT ((ACPI_DB_WARN, "acpi_disable failed\n"));
 584                 }
 585         }
 586         return_VOID;
 587 }
 588