arch/all-pc/acpica/source/components/events/evxfevnt.c

   1 /******************************************************************************
   2  *
   3  * Module Name: evxfevnt - External Interfaces, ACPI event disable/enable
   4  *
   5  *****************************************************************************/
   6
   7 /*
   8  * Copyright (C) 2000 - 2013, 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
  45 #define __EVXFEVNT_C__
  46 #define EXPORT_ACPI_INTERFACES
  47
  48 #include "acpi.h"
  49 #include "accommon.h"
  50 #include "actables.h"
  51
  52 #define _COMPONENT          ACPI_EVENTS
  53         ACPI_MODULE_NAME    ("evxfevnt")
  54
  55
  56 #if (!ACPI_REDUCED_HARDWARE) /* Entire module */
  57 /*******************************************************************************
  58  *
  59  * FUNCTION:    AcpiEnable
  60  *
  61  * PARAMETERS:  None
  62  *
  63  * RETURN:      Status
  64  *
  65  * DESCRIPTION: Transfers the system into ACPI mode.
  66  *
  67  ******************************************************************************/
  68
  69 ACPI_STATUS
  70 AcpiEnable (
  71     void)
  72 {
  73     ACPI_STATUS             Status = AE_OK;
  74
  75
  76     ACPI_FUNCTION_TRACE (AcpiEnable);
  77
  78
  79     /* ACPI tables must be present */
  80
  81     if (!AcpiTbTablesLoaded ())
  82     {
  83         return_ACPI_STATUS (AE_NO_ACPI_TABLES);
  84     }
  85
  86     /* If the Hardware Reduced flag is set, machine is always in acpi mode */
  87
  88     if (AcpiGbl_ReducedHardware)
  89     {
  90         return_ACPI_STATUS (AE_OK);
  91     }
  92
  93     /* Check current mode */
  94
  95     if (AcpiHwGetMode() == ACPI_SYS_MODE_ACPI)
  96     {
  97         ACPI_DEBUG_PRINT ((ACPI_DB_INIT, "System is already in ACPI mode\n"));
  98     }
  99     else
 100     {
 101         /* Transition to ACPI mode */
 102
 103         Status = AcpiHwSetMode (ACPI_SYS_MODE_ACPI);
 104         if (ACPI_FAILURE (Status))
 105         {
 106             ACPI_ERROR ((AE_INFO, "Could not transition to ACPI mode"));
 107             return_ACPI_STATUS (Status);
 108         }
 109
 110         ACPI_DEBUG_PRINT ((ACPI_DB_INIT,
 111             "Transition to ACPI mode successful\n"));
 112     }
 113
 114     return_ACPI_STATUS (Status);
 115 }
 116
 117 ACPI_EXPORT_SYMBOL (AcpiEnable)
 118
 119
 120 /*******************************************************************************
 121  *
 122  * FUNCTION:    AcpiDisable
 123  *
 124  * PARAMETERS:  None
 125  *
 126  * RETURN:      Status
 127  *
 128  * DESCRIPTION: Transfers the system into LEGACY (non-ACPI) mode.
 129  *
 130  ******************************************************************************/
 131
 132 ACPI_STATUS
 133 AcpiDisable (
 134     void)
 135 {
 136     ACPI_STATUS             Status = AE_OK;
 137
 138
 139     ACPI_FUNCTION_TRACE (AcpiDisable);
 140
 141
 142     /* If the Hardware Reduced flag is set, machine is always in acpi mode */
 143
 144     if (AcpiGbl_ReducedHardware)
 145     {
 146         return_ACPI_STATUS (AE_OK);
 147     }
 148
 149     if (AcpiHwGetMode() == ACPI_SYS_MODE_LEGACY)
 150     {
 151         ACPI_DEBUG_PRINT ((ACPI_DB_INIT,
 152             "System is already in legacy (non-ACPI) mode\n"));
 153     }
 154     else
 155     {
 156         /* Transition to LEGACY mode */
 157
 158         Status = AcpiHwSetMode (ACPI_SYS_MODE_LEGACY);
 159
 160         if (ACPI_FAILURE (Status))
 161         {
 162             ACPI_ERROR ((AE_INFO,
 163                 "Could not exit ACPI mode to legacy mode"));
 164             return_ACPI_STATUS (Status);
 165         }
 166
 167         ACPI_DEBUG_PRINT ((ACPI_DB_INIT, "ACPI mode disabled\n"));
 168     }
 169
 170     return_ACPI_STATUS (Status);
 171 }
 172
 173 ACPI_EXPORT_SYMBOL (AcpiDisable)
 174
 175
 176 /*******************************************************************************
 177  *
 178  * FUNCTION:    AcpiEnableEvent
 179  *
 180  * PARAMETERS:  Event           - The fixed eventto be enabled
 181  *              Flags           - Reserved
 182  *
 183  * RETURN:      Status
 184  *
 185  * DESCRIPTION: Enable an ACPI event (fixed)
 186  *
 187  ******************************************************************************/
 188
 189 ACPI_STATUS
 190 AcpiEnableEvent (
 191     UINT32                  Event,
 192     UINT32                  Flags)
 193 {
 194     ACPI_STATUS             Status = AE_OK;
 195     UINT32                  Value;
 196
 197
 198     ACPI_FUNCTION_TRACE (AcpiEnableEvent);
 199
 200
 201     /* Decode the Fixed Event */
 202
 203     if (Event > ACPI_EVENT_MAX)
 204     {
 205         return_ACPI_STATUS (AE_BAD_PARAMETER);
 206     }
 207
 208     /*
 209      * Enable the requested fixed event (by writing a one to the enable
 210      * register bit)
 211      */
 212     Status = AcpiWriteBitRegister (
 213                 AcpiGbl_FixedEventInfo[Event].EnableRegisterId,
 214                 ACPI_ENABLE_EVENT);
 215     if (ACPI_FAILURE (Status))
 216     {
 217         return_ACPI_STATUS (Status);
 218     }
 219
 220     /* Make sure that the hardware responded */
 221
 222     Status = AcpiReadBitRegister (
 223                 AcpiGbl_FixedEventInfo[Event].EnableRegisterId, &Value);
 224     if (ACPI_FAILURE (Status))
 225     {
 226         return_ACPI_STATUS (Status);
 227     }
 228
 229     if (Value != 1)
 230     {
 231         ACPI_ERROR ((AE_INFO,
 232             "Could not enable %s event", AcpiUtGetEventName (Event)));
 233         return_ACPI_STATUS (AE_NO_HARDWARE_RESPONSE);
 234     }
 235
 236     return_ACPI_STATUS (Status);
 237 }
 238
 239 ACPI_EXPORT_SYMBOL (AcpiEnableEvent)
 240
 241
 242 /*******************************************************************************
 243  *
 244  * FUNCTION:    AcpiDisableEvent
 245  *
 246  * PARAMETERS:  Event           - The fixed event to be disabled
 247  *              Flags           - Reserved
 248  *
 249  * RETURN:      Status
 250  *
 251  * DESCRIPTION: Disable an ACPI event (fixed)
 252  *
 253  ******************************************************************************/
 254
 255 ACPI_STATUS
 256 AcpiDisableEvent (
 257     UINT32                  Event,
 258     UINT32                  Flags)
 259 {
 260     ACPI_STATUS             Status = AE_OK;
 261     UINT32                  Value;
 262
 263
 264     ACPI_FUNCTION_TRACE (AcpiDisableEvent);
 265
 266
 267     /* Decode the Fixed Event */
 268
 269     if (Event > ACPI_EVENT_MAX)
 270     {
 271         return_ACPI_STATUS (AE_BAD_PARAMETER);
 272     }
 273
 274     /*
 275      * Disable the requested fixed event (by writing a zero to the enable
 276      * register bit)
 277      */
 278     Status = AcpiWriteBitRegister (
 279                 AcpiGbl_FixedEventInfo[Event].EnableRegisterId,
 280                 ACPI_DISABLE_EVENT);
 281     if (ACPI_FAILURE (Status))
 282     {
 283         return_ACPI_STATUS (Status);
 284     }
 285
 286     Status = AcpiReadBitRegister (
 287                 AcpiGbl_FixedEventInfo[Event].EnableRegisterId, &Value);
 288     if (ACPI_FAILURE (Status))
 289     {
 290         return_ACPI_STATUS (Status);
 291     }
 292
 293     if (Value != 0)
 294     {
 295         ACPI_ERROR ((AE_INFO,
 296             "Could not disable %s events", AcpiUtGetEventName (Event)));
 297         return_ACPI_STATUS (AE_NO_HARDWARE_RESPONSE);
 298     }
 299
 300     return_ACPI_STATUS (Status);
 301 }
 302
 303 ACPI_EXPORT_SYMBOL (AcpiDisableEvent)
 304
 305
 306 /*******************************************************************************
 307  *
 308  * FUNCTION:    AcpiClearEvent
 309  *
 310  * PARAMETERS:  Event           - The fixed event to be cleared
 311  *
 312  * RETURN:      Status
 313  *
 314  * DESCRIPTION: Clear an ACPI event (fixed)
 315  *
 316  ******************************************************************************/
 317
 318 ACPI_STATUS
 319 AcpiClearEvent (
 320     UINT32                  Event)
 321 {
 322     ACPI_STATUS             Status = AE_OK;
 323
 324
 325     ACPI_FUNCTION_TRACE (AcpiClearEvent);
 326
 327
 328     /* Decode the Fixed Event */
 329
 330     if (Event > ACPI_EVENT_MAX)
 331     {
 332         return_ACPI_STATUS (AE_BAD_PARAMETER);
 333     }
 334
 335     /*
 336      * Clear the requested fixed event (By writing a one to the status
 337      * register bit)
 338      */
 339     Status = AcpiWriteBitRegister (
 340                 AcpiGbl_FixedEventInfo[Event].StatusRegisterId,
 341                 ACPI_CLEAR_STATUS);
 342
 343     return_ACPI_STATUS (Status);
 344 }
 345
 346 ACPI_EXPORT_SYMBOL (AcpiClearEvent)
 347
 348
 349 /*******************************************************************************
 350  *
 351  * FUNCTION:    AcpiGetEventStatus
 352  *
 353  * PARAMETERS:  Event           - The fixed event
 354  *              EventStatus     - Where the current status of the event will
 355  *                                be returned
 356  *
 357  * RETURN:      Status
 358  *
 359  * DESCRIPTION: Obtains and returns the current status of the event
 360  *
 361  ******************************************************************************/
 362
 363 ACPI_STATUS
 364 AcpiGetEventStatus (
 365     UINT32                  Event,
 366     ACPI_EVENT_STATUS       *EventStatus)
 367 {
 368     ACPI_STATUS             Status = AE_OK;
 369
 370
 371     ACPI_FUNCTION_TRACE (AcpiGetEventStatus);
 372
 373
 374     if (!EventStatus)
 375     {
 376         return_ACPI_STATUS (AE_BAD_PARAMETER);
 377     }
 378
 379     /* Decode the Fixed Event */
 380
 381     if (Event > ACPI_EVENT_MAX)
 382     {
 383         return_ACPI_STATUS (AE_BAD_PARAMETER);
 384     }
 385
 386     /* Get the status of the requested fixed event */
 387
 388     Status = AcpiReadBitRegister (
 389                 AcpiGbl_FixedEventInfo[Event].StatusRegisterId, EventStatus);
 390
 391     return_ACPI_STATUS (Status);
 392 }
 393
 394 ACPI_EXPORT_SYMBOL (AcpiGetEventStatus)
 395
 396 #endif /* !ACPI_REDUCED_HARDWARE */