1 /****************************************************************************** 2 * 3 * Module Name: evxfevnt - External Interfaces, ACPI event disable/enable 4 * 5 *****************************************************************************/ 6 7 /* 8 * Copyright (C) 2000 - 2015, 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 #define EXPORT_ACPI_INTERFACES 45 46 #include <contrib/dev/acpica/include/acpi.h> 47 #include <contrib/dev/acpica/include/accommon.h> 48 #include <contrib/dev/acpica/include/actables.h> 49 50 #define _COMPONENT ACPI_EVENTS 51 ACPI_MODULE_NAME ("evxfevnt") 52 53 54 #if (!ACPI_REDUCED_HARDWARE) /* Entire module */ 55 /******************************************************************************* 56 * 57 * FUNCTION: AcpiEnable 58 * 59 * PARAMETERS: None 60 * 61 * RETURN: Status 62 * 63 * DESCRIPTION: Transfers the system into ACPI mode. 64 * 65 ******************************************************************************/ 66 67 ACPI_STATUS 68 AcpiEnable ( 69 void) 70 { 71 ACPI_STATUS Status = AE_OK; 72 73 74 ACPI_FUNCTION_TRACE (AcpiEnable); 75 76 77 /* ACPI tables must be present */ 78 79 if (!AcpiTbTablesLoaded ()) 80 { 81 return_ACPI_STATUS (AE_NO_ACPI_TABLES); 82 } 83 84 /* If the Hardware Reduced flag is set, machine is always in acpi mode */ 85 86 if (AcpiGbl_ReducedHardware) 87 { 88 return_ACPI_STATUS (AE_OK); 89 } 90 91 /* Check current mode */ 92 93 if (AcpiHwGetMode() == ACPI_SYS_MODE_ACPI) 94 { 95 ACPI_DEBUG_PRINT ((ACPI_DB_INIT, "System is already in ACPI mode\n")); 96 } 97 else 98 { 99 /* Transition to ACPI mode */ 100 101 Status = AcpiHwSetMode (ACPI_SYS_MODE_ACPI); 102 if (ACPI_FAILURE (Status)) 103 { 104 ACPI_ERROR ((AE_INFO, "Could not transition to ACPI mode")); 105 return_ACPI_STATUS (Status); 106 } 107 108 ACPI_DEBUG_PRINT ((ACPI_DB_INIT, 109 "Transition to ACPI mode successful\n")); 110 } 111 112 return_ACPI_STATUS (Status); 113 } 114 115 ACPI_EXPORT_SYMBOL (AcpiEnable) 116 117 118 /******************************************************************************* 119 * 120 * FUNCTION: AcpiDisable 121 * 122 * PARAMETERS: None 123 * 124 * RETURN: Status 125 * 126 * DESCRIPTION: Transfers the system into LEGACY (non-ACPI) mode. 127 * 128 ******************************************************************************/ 129 130 ACPI_STATUS 131 AcpiDisable ( 132 void) 133 { 134 ACPI_STATUS Status = AE_OK; 135 136 137 ACPI_FUNCTION_TRACE (AcpiDisable); 138 139 140 /* If the Hardware Reduced flag is set, machine is always in acpi mode */ 141 142 if (AcpiGbl_ReducedHardware) 143 { 144 return_ACPI_STATUS (AE_OK); 145 } 146 147 if (AcpiHwGetMode() == ACPI_SYS_MODE_LEGACY) 148 { 149 ACPI_DEBUG_PRINT ((ACPI_DB_INIT, 150 "System is already in legacy (non-ACPI) mode\n")); 151 } 152 else 153 { 154 /* Transition to LEGACY mode */ 155 156 Status = AcpiHwSetMode (ACPI_SYS_MODE_LEGACY); 157 158 if (ACPI_FAILURE (Status)) 159 { 160 ACPI_ERROR ((AE_INFO, 161 "Could not exit ACPI mode to legacy mode")); 162 return_ACPI_STATUS (Status); 163 } 164 165 ACPI_DEBUG_PRINT ((ACPI_DB_INIT, "ACPI mode disabled\n")); 166 } 167 168 return_ACPI_STATUS (Status); 169 } 170 171 ACPI_EXPORT_SYMBOL (AcpiDisable) 172 173 174 /******************************************************************************* 175 * 176 * FUNCTION: AcpiEnableEvent 177 * 178 * PARAMETERS: Event - The fixed eventto be enabled 179 * Flags - Reserved 180 * 181 * RETURN: Status 182 * 183 * DESCRIPTION: Enable an ACPI event (fixed) 184 * 185 ******************************************************************************/ 186 187 ACPI_STATUS 188 AcpiEnableEvent ( 189 UINT32 Event, 190 UINT32 Flags) 191 { 192 ACPI_STATUS Status = AE_OK; 193 UINT32 Value; 194 195 196 ACPI_FUNCTION_TRACE (AcpiEnableEvent); 197 198 199 /* Decode the Fixed Event */ 200 201 if (Event > ACPI_EVENT_MAX) 202 { 203 return_ACPI_STATUS (AE_BAD_PARAMETER); 204 } 205 206 /* 207 * Enable the requested fixed event (by writing a one to the enable 208 * register bit) 209 */ 210 Status = AcpiWriteBitRegister ( 211 AcpiGbl_FixedEventInfo[Event].EnableRegisterId, 212 ACPI_ENABLE_EVENT); 213 if (ACPI_FAILURE (Status)) 214 { 215 return_ACPI_STATUS (Status); 216 } 217 218 /* Make sure that the hardware responded */ 219 220 Status = AcpiReadBitRegister ( 221 AcpiGbl_FixedEventInfo[Event].EnableRegisterId, &Value); 222 if (ACPI_FAILURE (Status)) 223 { 224 return_ACPI_STATUS (Status); 225 } 226 227 if (Value != 1) 228 { 229 ACPI_ERROR ((AE_INFO, 230 "Could not enable %s event", AcpiUtGetEventName (Event))); 231 return_ACPI_STATUS (AE_NO_HARDWARE_RESPONSE); 232 } 233 234 return_ACPI_STATUS (Status); 235 } 236 237 ACPI_EXPORT_SYMBOL (AcpiEnableEvent) 238 239 240 /******************************************************************************* 241 * 242 * FUNCTION: AcpiDisableEvent 243 * 244 * PARAMETERS: Event - The fixed event to be disabled 245 * Flags - Reserved 246 * 247 * RETURN: Status 248 * 249 * DESCRIPTION: Disable an ACPI event (fixed) 250 * 251 ******************************************************************************/ 252 253 ACPI_STATUS 254 AcpiDisableEvent ( 255 UINT32 Event, 256 UINT32 Flags) 257 { 258 ACPI_STATUS Status = AE_OK; 259 UINT32 Value; 260 261 262 ACPI_FUNCTION_TRACE (AcpiDisableEvent); 263 264 265 /* Decode the Fixed Event */ 266 267 if (Event > ACPI_EVENT_MAX) 268 { 269 return_ACPI_STATUS (AE_BAD_PARAMETER); 270 } 271 272 /* 273 * Disable the requested fixed event (by writing a zero to the enable 274 * register bit) 275 */ 276 Status = AcpiWriteBitRegister ( 277 AcpiGbl_FixedEventInfo[Event].EnableRegisterId, 278 ACPI_DISABLE_EVENT); 279 if (ACPI_FAILURE (Status)) 280 { 281 return_ACPI_STATUS (Status); 282 } 283 284 Status = AcpiReadBitRegister ( 285 AcpiGbl_FixedEventInfo[Event].EnableRegisterId, &Value); 286 if (ACPI_FAILURE (Status)) 287 { 288 return_ACPI_STATUS (Status); 289 } 290 291 if (Value != 0) 292 { 293 ACPI_ERROR ((AE_INFO, 294 "Could not disable %s events", AcpiUtGetEventName (Event))); 295 return_ACPI_STATUS (AE_NO_HARDWARE_RESPONSE); 296 } 297 298 return_ACPI_STATUS (Status); 299 } 300 301 ACPI_EXPORT_SYMBOL (AcpiDisableEvent) 302 303 304 /******************************************************************************* 305 * 306 * FUNCTION: AcpiClearEvent 307 * 308 * PARAMETERS: Event - The fixed event to be cleared 309 * 310 * RETURN: Status 311 * 312 * DESCRIPTION: Clear an ACPI event (fixed) 313 * 314 ******************************************************************************/ 315 316 ACPI_STATUS 317 AcpiClearEvent ( 318 UINT32 Event) 319 { 320 ACPI_STATUS Status = AE_OK; 321 322 323 ACPI_FUNCTION_TRACE (AcpiClearEvent); 324 325 326 /* Decode the Fixed Event */ 327 328 if (Event > ACPI_EVENT_MAX) 329 { 330 return_ACPI_STATUS (AE_BAD_PARAMETER); 331 } 332 333 /* 334 * Clear the requested fixed event (By writing a one to the status 335 * register bit) 336 */ 337 Status = AcpiWriteBitRegister ( 338 AcpiGbl_FixedEventInfo[Event].StatusRegisterId, 339 ACPI_CLEAR_STATUS); 340 341 return_ACPI_STATUS (Status); 342 } 343 344 ACPI_EXPORT_SYMBOL (AcpiClearEvent) 345 346 347 /******************************************************************************* 348 * 349 * FUNCTION: AcpiGetEventStatus 350 * 351 * PARAMETERS: Event - The fixed event 352 * EventStatus - Where the current status of the event will 353 * be returned 354 * 355 * RETURN: Status 356 * 357 * DESCRIPTION: Obtains and returns the current status of the event 358 * 359 ******************************************************************************/ 360 361 ACPI_STATUS 362 AcpiGetEventStatus ( 363 UINT32 Event, 364 ACPI_EVENT_STATUS *EventStatus) 365 { 366 ACPI_STATUS Status; 367 ACPI_EVENT_STATUS LocalEventStatus = 0; 368 UINT32 InByte; 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 /* Fixed event currently can be dispatched? */ 387 388 if (AcpiGbl_FixedEventHandlers[Event].Handler) 389 { 390 LocalEventStatus |= ACPI_EVENT_FLAG_HAS_HANDLER; 391 } 392 393 /* Fixed event currently enabled? */ 394 395 Status = AcpiReadBitRegister ( 396 AcpiGbl_FixedEventInfo[Event].EnableRegisterId, &InByte); 397 if (ACPI_FAILURE (Status)) 398 { 399 return_ACPI_STATUS (Status); 400 } 401 402 if (InByte) 403 { 404 LocalEventStatus |= 405 (ACPI_EVENT_FLAG_ENABLED | ACPI_EVENT_FLAG_ENABLE_SET); 406 } 407 408 /* Fixed event currently active? */ 409 410 Status = AcpiReadBitRegister ( 411 AcpiGbl_FixedEventInfo[Event].StatusRegisterId, &InByte); 412 if (ACPI_FAILURE (Status)) 413 { 414 return_ACPI_STATUS (Status); 415 } 416 417 if (InByte) 418 { 419 LocalEventStatus |= ACPI_EVENT_FLAG_STATUS_SET; 420 } 421 422 (*EventStatus) = LocalEventStatus; 423 return_ACPI_STATUS (AE_OK); 424 } 425 426 ACPI_EXPORT_SYMBOL (AcpiGetEventStatus) 427 428 #endif /* !ACPI_REDUCED_HARDWARE */ 429