drivers/bus/acpi/events/evmisc.c

   1 /******************************************************************************
   2  *
   3  * Module Name: evmisc - ACPI device notification handler dispatch
   4  *                       and ACPI Global Lock support
   5  *              $Revision$
   6  *
   7  *****************************************************************************/
   8
   9 /*
  10  *  Copyright (C) 2000, 2001 R. Byron Moore
  11  *
  12  *  This program is free software; you can redistribute it and/or modify
  13  *  it under the terms of the GNU General Public License as published by
  14  *  the Free Software Foundation; either version 2 of the License, or
  15  *  (at your option) any later version.
  16  *
  17  *  This program is distributed in the hope that it will be useful,
  18  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
  19  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  20  *  GNU General Public License for more details.
  21  *
  22  *  You should have received a copy of the GNU General Public License
  23  *  along with this program; if not, write to the Free Software
  24  *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  25  */
  26
  27 #include "acpi.h"
  28 #include "acevents.h"
  29 #include "acnamesp.h"
  30 #include "acinterp.h"
  31 #include "achware.h"
  32
  33 #define _COMPONENT          ACPI_EVENTS
  34          MODULE_NAME         ("evmisc")
  35
  36
  37 /**************************************************************************
  38  *
  39  * FUNCTION:    Acpi_ev_queue_notify_request
  40  *
  41  * PARAMETERS:
  42  *
  43  * RETURN:      None.
  44  *
  45  * DESCRIPTION: Dispatch a device notification event to a previously
  46  *              installed handler.
  47  *
  48  *************************************************************************/
  49
  50 ACPI_STATUS
  51 acpi_ev_queue_notify_request (
  52         ACPI_NAMESPACE_NODE     *node,
  53         u32                     notify_value)
  54 {
  55         ACPI_OPERAND_OBJECT     *obj_desc;
  56         ACPI_OPERAND_OBJECT     *handler_obj = NULL;
  57         ACPI_GENERIC_STATE      *notify_info;
  58         ACPI_STATUS             status = AE_OK;
  59
  60
  61         /*
  62          * For value 1 (Ejection Request), some device method may need to be run.
  63          * For value 2 (Device Wake) if _PRW exists, the _PS0 method may need to be run.
  64          * For value 0x80 (Status Change) on the power button or sleep button,
  65          * initiate soft-off or sleep operation?
  66          */
  67
  68         switch (notify_value) {
  69         case 0:
  70                 break;
  71
  72         case 1:
  73                 break;
  74
  75         case 2:
  76                 break;
  77
  78         case 0x80:
  79                 break;
  80
  81         default:
  82                 break;
  83         }
  84
  85
  86         /*
  87          * Get the notify object attached to the device Node
  88          */
  89
  90         obj_desc = acpi_ns_get_attached_object ((ACPI_HANDLE) node);
  91         if (obj_desc) {
  92
  93                 /* We have the notify object, Get the right handler */
  94
  95                 switch (node->type) {
  96                 case ACPI_TYPE_DEVICE:
  97                         if (notify_value <= MAX_SYS_NOTIFY) {
  98                                 handler_obj = obj_desc->device.sys_handler;
  99                         }
 100                         else {
 101                                 handler_obj = obj_desc->device.drv_handler;
 102                         }
 103                         break;
 104
 105                 case ACPI_TYPE_THERMAL:
 106                         if (notify_value <= MAX_SYS_NOTIFY) {
 107                                 handler_obj = obj_desc->thermal_zone.sys_handler;
 108                         }
 109                         else {
 110                                 handler_obj = obj_desc->thermal_zone.drv_handler;
 111                         }
 112                         break;
 113                 }
 114         }
 115
 116
 117         /* If there is any handler to run, schedule the dispatcher */
 118
 119         if ((acpi_gbl_sys_notify.handler && (notify_value <= MAX_SYS_NOTIFY)) ||
 120                 (acpi_gbl_drv_notify.handler && (notify_value > MAX_SYS_NOTIFY)) ||
 121                 handler_obj) {
 122
 123                 notify_info = acpi_cm_create_generic_state ();
 124                 if (!notify_info) {
 125                         return (AE_NO_MEMORY);
 126                 }
 127
 128                 notify_info->notify.node      = node;
 129                 notify_info->notify.value     = (u16) notify_value;
 130                 notify_info->notify.handler_obj = handler_obj;
 131
 132                 status = acpi_os_queue_for_execution (OSD_PRIORITY_HIGH,
 133                                   acpi_ev_notify_dispatch, notify_info);
 134                 if (ACPI_FAILURE (status)) {
 135                         acpi_cm_delete_generic_state (notify_info);
 136                 }
 137         }
 138
 139         if (!handler_obj) {
 140                 /* There is no per-device notify handler for this device */
 141
 142         }
 143
 144
 145         return (status);
 146 }
 147
 148
 149 /**************************************************************************
 150  *
 151  * FUNCTION:    Acpi_ev_notify_dispatch
 152  *
 153  * PARAMETERS:
 154  *
 155  * RETURN:      None.
 156  *
 157  * DESCRIPTION: Dispatch a device notification event to a previously
 158  *              installed handler.
 159  *
 160  *************************************************************************/
 161
 162 void
 163 acpi_ev_notify_dispatch (
 164         void                    *context)
 165 {
 166         ACPI_GENERIC_STATE      *notify_info = (ACPI_GENERIC_STATE *) context;
 167         NOTIFY_HANDLER          global_handler = NULL;
 168         void                    *global_context = NULL;
 169         ACPI_OPERAND_OBJECT     *handler_obj;
 170
 171
 172         /*
 173          * We will invoke a global notify handler if installed.
 174          * This is done _before_ we invoke the per-device handler attached to the device.
 175          */
 176
 177         if (notify_info->notify.value <= MAX_SYS_NOTIFY) {
 178                 /* Global system notification handler */
 179
 180                 if (acpi_gbl_sys_notify.handler) {
 181                         global_handler = acpi_gbl_sys_notify.handler;
 182                         global_context = acpi_gbl_sys_notify.context;
 183                 }
 184         }
 185
 186         else {
 187                 /* Global driver notification handler */
 188
 189                 if (acpi_gbl_drv_notify.handler) {
 190                         global_handler = acpi_gbl_drv_notify.handler;
 191                         global_context = acpi_gbl_drv_notify.context;
 192                 }
 193         }
 194
 195
 196         /* Invoke the system handler first, if present */
 197
 198         if (global_handler) {
 199                 global_handler (notify_info->notify.node, notify_info->notify.value, global_context);
 200         }
 201
 202         /* Now invoke the per-device handler, if present */
 203
 204         handler_obj = notify_info->notify.handler_obj;
 205         if (handler_obj) {
 206                 handler_obj->notify_handler.handler (notify_info->notify.node, notify_info->notify.value,
 207                                   handler_obj->notify_handler.context);
 208         }
 209
 210
 211         /* All done with the info object */
 212
 213         acpi_cm_delete_generic_state (notify_info);
 214 }
 215
 216
 217 /***************************************************************************
 218  *
 219  * FUNCTION:    Acpi_ev_global_lock_thread
 220  *
 221  * RETURN:      None
 222  *
 223  * DESCRIPTION: Invoked by SCI interrupt handler upon acquisition of the
 224  *              Global Lock.  Simply signal all threads that are waiting
 225  *              for the lock.
 226  *
 227  **************************************************************************/
 228
 229 static void
 230 acpi_ev_global_lock_thread (
 231         void                    *context)
 232 {
 233
 234         /* Signal threads that are waiting for the lock */
 235
 236         if (acpi_gbl_global_lock_thread_count) {
 237                 /* Send sufficient units to the semaphore */
 238
 239                 acpi_os_signal_semaphore (acpi_gbl_global_lock_semaphore,
 240                                  acpi_gbl_global_lock_thread_count);
 241         }
 242 }
 243
 244
 245 /***************************************************************************
 246  *
 247  * FUNCTION:    Acpi_ev_global_lock_handler
 248  *
 249  * RETURN:      Status
 250  *
 251  * DESCRIPTION: Invoked directly from the SCI handler when a global lock
 252  *              release interrupt occurs.  Grab the global lock and queue
 253  *              the global lock thread for execution
 254  *
 255  **************************************************************************/
 256
 257 static u32
 258 acpi_ev_global_lock_handler (
 259         void                    *context)
 260 {
 261         u8                      acquired = FALSE;
 262         void                    *global_lock;
 263
 264
 265         /*
 266          * Attempt to get the lock
 267          * If we don't get it now, it will be marked pending and we will
 268          * take another interrupt when it becomes free.
 269          */
 270
 271         global_lock = acpi_gbl_FACS->global_lock;
 272         ACPI_ACQUIRE_GLOBAL_LOCK (global_lock, acquired);
 273         if (acquired) {
 274                 /* Got the lock, now wake all threads waiting for it */
 275
 276                 acpi_gbl_global_lock_acquired = TRUE;
 277
 278                 /* Run the Global Lock thread which will signal all waiting threads */
 279
 280                 acpi_os_queue_for_execution (OSD_PRIORITY_HIGH, acpi_ev_global_lock_thread,
 281                                   context);
 282         }
 283
 284         return (INTERRUPT_HANDLED);
 285 }
 286
 287
 288 /***************************************************************************
 289  *
 290  * FUNCTION:    Acpi_ev_init_global_lock_handler
 291  *
 292  * RETURN:      Status
 293  *
 294  * DESCRIPTION: Install a handler for the global lock release event
 295  *
 296  **************************************************************************/
 297
 298 ACPI_STATUS
 299 acpi_ev_init_global_lock_handler (void)
 300 {
 301         ACPI_STATUS             status;
 302
 303
 304         acpi_gbl_global_lock_present = TRUE;
 305         status = acpi_install_fixed_event_handler (ACPI_EVENT_GLOBAL,
 306                           acpi_ev_global_lock_handler, NULL);
 307
 308         /*
 309          * If the global lock does not exist on this platform, the attempt
 310          * to enable GBL_STS will fail (the GBL_EN bit will not stick)
 311          * Map to AE_OK, but mark global lock as not present.
 312          * Any attempt to actually use the global lock will be flagged
 313          * with an error.
 314          */
 315         if (status == AE_NO_HARDWARE_RESPONSE) {
 316                 acpi_gbl_global_lock_present = FALSE;
 317                 status = AE_OK;
 318         }
 319
 320         return (status);
 321 }
 322
 323
 324 /***************************************************************************
 325  *
 326  * FUNCTION:    Acpi_ev_acquire_global_lock
 327  *
 328  * RETURN:      Status
 329  *
 330  * DESCRIPTION: Attempt to gain ownership of the Global Lock.
 331  *
 332  **************************************************************************/
 333
 334 ACPI_STATUS
 335 acpi_ev_acquire_global_lock(void)
 336 {
 337         ACPI_STATUS             status = AE_OK;
 338         u8                      acquired = FALSE;
 339         void                    *global_lock;
 340
 341
 342         /* Make sure that we actually have a global lock */
 343
 344         if (!acpi_gbl_global_lock_present) {
 345                 return (AE_NO_GLOBAL_LOCK);
 346         }
 347
 348         /* One more thread wants the global lock */
 349
 350         acpi_gbl_global_lock_thread_count++;
 351
 352
 353         /* If we (OS side) have the hardware lock already, we are done */
 354
 355         if (acpi_gbl_global_lock_acquired) {
 356                 return (AE_OK);
 357         }
 358
 359         /* Only if the FACS is valid */
 360
 361         if (!acpi_gbl_FACS) {
 362                 return (AE_OK);
 363         }
 364
 365
 366         /* We must acquire the actual hardware lock */
 367
 368         global_lock = acpi_gbl_FACS->global_lock;
 369         ACPI_ACQUIRE_GLOBAL_LOCK (global_lock, acquired);
 370         if (acquired) {
 371            /* We got the lock */
 372
 373                 acpi_gbl_global_lock_acquired = TRUE;
 374
 375                 return (AE_OK);
 376         }
 377
 378
 379         /*
 380          * Did not get the lock.  The pending bit was set above, and we must now
 381          * wait until we get the global lock released interrupt.
 382          */
 383
 384          /*
 385           * Acquire the global lock semaphore first.
 386           * Since this wait will block, we must release the interpreter
 387           */
 388
 389         status = acpi_aml_system_wait_semaphore (acpi_gbl_global_lock_semaphore,
 390                           ACPI_UINT32_MAX);
 391
 392         return (status);
 393 }
 394
 395
 396 /***************************************************************************
 397  *
 398  * FUNCTION:    Acpi_ev_release_global_lock
 399  *
 400  * DESCRIPTION: Releases ownership of the Global Lock.
 401  *
 402  **************************************************************************/
 403
 404 void
 405 acpi_ev_release_global_lock (void)
 406 {
 407         u8                      pending = FALSE;
 408         void                    *global_lock;
 409
 410
 411         if (!acpi_gbl_global_lock_thread_count) {
 412                 REPORT_WARNING(("Global Lock has not be acquired, cannot release\n"));
 413                 return;
 414         }
 415
 416    /* One fewer thread has the global lock */
 417
 418         acpi_gbl_global_lock_thread_count--;
 419
 420         /* Have all threads released the lock? */
 421
 422         if (!acpi_gbl_global_lock_thread_count) {
 423                 /*
 424                  * No more threads holding lock, we can do the actual hardware
 425                  * release
 426                  */
 427
 428                 global_lock = acpi_gbl_FACS->global_lock;
 429                 ACPI_RELEASE_GLOBAL_LOCK (global_lock, pending);
 430                 acpi_gbl_global_lock_acquired = FALSE;
 431
 432                 /*
 433                  * If the pending bit was set, we must write GBL_RLS to the control
 434                  * register
 435                  */
 436                 if (pending) {
 437                         acpi_hw_register_bit_access (ACPI_WRITE, ACPI_MTX_LOCK,
 438                                          GBL_RLS, 1);
 439                 }
 440         }
 441
 442         return;
 443 }