1 /****************************************************************************** 2 * 3 * Module Name: evxfevnt - External Interfaces, ACPI event disable/enable 4 * 5 *****************************************************************************/ 6 7 /* 8 * Copyright (C) 2000 - 2011, 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 47 #include "acpi.h" 48 #include "accommon.h" 49 #include "actables.h" 50 51 #define _COMPONENT ACPI_EVENTS 52 ACPI_MODULE_NAME ("evxfevnt") 53 54 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 /* Check current mode */ 85 86 if (AcpiHwGetMode() == ACPI_SYS_MODE_ACPI) 87 { 88 ACPI_DEBUG_PRINT ((ACPI_DB_INIT, "System is already in ACPI mode\n")); 89 } 90 else 91 { 92 /* Transition to ACPI mode */ 93 94 Status = AcpiHwSetMode (ACPI_SYS_MODE_ACPI); 95 if (ACPI_FAILURE (Status)) 96 { 97 ACPI_ERROR ((AE_INFO, "Could not transition to ACPI mode")); 98 return_ACPI_STATUS (Status); 99 } 100 101 ACPI_DEBUG_PRINT ((ACPI_DB_INIT, 102 "Transition to ACPI mode successful\n")); 103 } 104 105 return_ACPI_STATUS (Status); 106 } 107 108 ACPI_EXPORT_SYMBOL (AcpiEnable) 109 110 111 /******************************************************************************* 112 * 113 * FUNCTION: AcpiDisable 114 * 115 * PARAMETERS: None 116 * 117 * RETURN: Status 118 * 119 * DESCRIPTION: Transfers the system into LEGACY (non-ACPI) mode. 120 * 121 ******************************************************************************/ 122 123 ACPI_STATUS 124 AcpiDisable ( 125 void) 126 { 127 ACPI_STATUS Status = AE_OK; 128 129 130 ACPI_FUNCTION_TRACE (AcpiDisable); 131 132 133 if (AcpiHwGetMode() == ACPI_SYS_MODE_LEGACY) 134 { 135 ACPI_DEBUG_PRINT ((ACPI_DB_INIT, 136 "System is already in legacy (non-ACPI) mode\n")); 137 } 138 else 139 { 140 /* Transition to LEGACY mode */ 141 142 Status = AcpiHwSetMode (ACPI_SYS_MODE_LEGACY); 143 144 if (ACPI_FAILURE (Status)) 145 { 146 ACPI_ERROR ((AE_INFO, 147 "Could not exit ACPI mode to legacy mode")); 148 return_ACPI_STATUS (Status); 149 } 150 151 ACPI_DEBUG_PRINT ((ACPI_DB_INIT, "ACPI mode disabled\n")); 152 } 153 154 return_ACPI_STATUS (Status); 155 } 156 157 ACPI_EXPORT_SYMBOL (AcpiDisable) 158 159 160 /******************************************************************************* 161 * 162 * FUNCTION: AcpiEnableEvent 163 * 164 * PARAMETERS: Event - The fixed eventto be enabled 165 * Flags - Reserved 166 * 167 * RETURN: Status 168 * 169 * DESCRIPTION: Enable an ACPI event (fixed) 170 * 171 ******************************************************************************/ 172 173 ACPI_STATUS 174 AcpiEnableEvent ( 175 UINT32 Event, 176 UINT32 Flags) 177 { 178 ACPI_STATUS Status = AE_OK; 179 UINT32 Value; 180 181 182 ACPI_FUNCTION_TRACE (AcpiEnableEvent); 183 184 185 /* Decode the Fixed Event */ 186 187 if (Event > ACPI_EVENT_MAX) 188 { 189 return_ACPI_STATUS (AE_BAD_PARAMETER); 190 } 191 192 /* 193 * Enable the requested fixed event (by writing a one to the enable 194 * register bit) 195 */ 196 Status = AcpiWriteBitRegister ( 197 AcpiGbl_FixedEventInfo[Event].EnableRegisterId, 198 ACPI_ENABLE_EVENT); 199 if (ACPI_FAILURE (Status)) 200 { 201 return_ACPI_STATUS (Status); 202 } 203 204 /* Make sure that the hardware responded */ 205 206 Status = AcpiReadBitRegister ( 207 AcpiGbl_FixedEventInfo[Event].EnableRegisterId, &Value); 208 if (ACPI_FAILURE (Status)) 209 { 210 return_ACPI_STATUS (Status); 211 } 212 213 if (Value != 1) 214 { 215 ACPI_ERROR ((AE_INFO, 216 "Could not enable %s event", AcpiUtGetEventName (Event))); 217 return_ACPI_STATUS (AE_NO_HARDWARE_RESPONSE); 218 } 219 220 return_ACPI_STATUS (Status); 221 } 222 223 ACPI_EXPORT_SYMBOL (AcpiEnableEvent) 224 225 226 /******************************************************************************* 227 * 228 * FUNCTION: AcpiDisableEvent 229 * 230 * PARAMETERS: Event - The fixed event to be disabled 231 * Flags - Reserved 232 * 233 * RETURN: Status 234 * 235 * DESCRIPTION: Disable an ACPI event (fixed) 236 * 237 ******************************************************************************/ 238 239 ACPI_STATUS 240 AcpiDisableEvent ( 241 UINT32 Event, 242 UINT32 Flags) 243 { 244 ACPI_STATUS Status = AE_OK; 245 UINT32 Value; 246 247 248 ACPI_FUNCTION_TRACE (AcpiDisableEvent); 249 250 251 /* Decode the Fixed Event */ 252 253 if (Event > ACPI_EVENT_MAX) 254 { 255 return_ACPI_STATUS (AE_BAD_PARAMETER); 256 } 257 258 /* 259 * Disable the requested fixed event (by writing a zero to the enable 260 * register bit) 261 */ 262 Status = AcpiWriteBitRegister ( 263 AcpiGbl_FixedEventInfo[Event].EnableRegisterId, 264 ACPI_DISABLE_EVENT); 265 if (ACPI_FAILURE (Status)) 266 { 267 return_ACPI_STATUS (Status); 268 } 269 270 Status = AcpiReadBitRegister ( 271 AcpiGbl_FixedEventInfo[Event].EnableRegisterId, &Value); 272 if (ACPI_FAILURE (Status)) 273 { 274 return_ACPI_STATUS (Status); 275 } 276 277 if (Value != 0) 278 { 279 ACPI_ERROR ((AE_INFO, 280 "Could not disable %s events", AcpiUtGetEventName (Event))); 281 return_ACPI_STATUS (AE_NO_HARDWARE_RESPONSE); 282 } 283 284 return_ACPI_STATUS (Status); 285 } 286 287 ACPI_EXPORT_SYMBOL (AcpiDisableEvent) 288 289 290 /******************************************************************************* 291 * 292 * FUNCTION: AcpiClearEvent 293 * 294 * PARAMETERS: Event - The fixed event to be cleared 295 * 296 * RETURN: Status 297 * 298 * DESCRIPTION: Clear an ACPI event (fixed) 299 * 300 ******************************************************************************/ 301 302 ACPI_STATUS 303 AcpiClearEvent ( 304 UINT32 Event) 305 { 306 ACPI_STATUS Status = AE_OK; 307 308 309 ACPI_FUNCTION_TRACE (AcpiClearEvent); 310 311 312 /* Decode the Fixed Event */ 313 314 if (Event > ACPI_EVENT_MAX) 315 { 316 return_ACPI_STATUS (AE_BAD_PARAMETER); 317 } 318 319 /* 320 * Clear the requested fixed event (By writing a one to the status 321 * register bit) 322 */ 323 Status = AcpiWriteBitRegister ( 324 AcpiGbl_FixedEventInfo[Event].StatusRegisterId, 325 ACPI_CLEAR_STATUS); 326 327 return_ACPI_STATUS (Status); 328 } 329 330 ACPI_EXPORT_SYMBOL (AcpiClearEvent) 331 332 333 /******************************************************************************* 334 * 335 * FUNCTION: AcpiGetEventStatus 336 * 337 * PARAMETERS: Event - The fixed event 338 * EventStatus - Where the current status of the event will 339 * be returned 340 * 341 * RETURN: Status 342 * 343 * DESCRIPTION: Obtains and returns the current status of the event 344 * 345 ******************************************************************************/ 346 347 ACPI_STATUS 348 AcpiGetEventStatus ( 349 UINT32 Event, 350 ACPI_EVENT_STATUS *EventStatus) 351 { 352 ACPI_STATUS Status = AE_OK; 353 354 355 ACPI_FUNCTION_TRACE (AcpiGetEventStatus); 356 357 358 if (!EventStatus) 359 { 360 return_ACPI_STATUS (AE_BAD_PARAMETER); 361 } 362 363 /* Decode the Fixed Event */ 364 365 if (Event > ACPI_EVENT_MAX) 366 { 367 return_ACPI_STATUS (AE_BAD_PARAMETER); 368 } 369 370 /* Get the status of the requested fixed event */ 371 372 Status = AcpiReadBitRegister ( 373 AcpiGbl_FixedEventInfo[Event].StatusRegisterId, EventStatus); 374 375 return_ACPI_STATUS (Status); 376 } 377 378 ACPI_EXPORT_SYMBOL (AcpiGetEventStatus) 379 380 381