1 /****************************************************************************** 2 * 3 * Module Name: evxfevnt - External Interfaces, ACPI event disable/enable 4 * 5 *****************************************************************************/ 6 7 /* 8 * Copyright (C) 2000 - 2017, 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 <acpi/acpi.h> 47 #include "accommon.h" 48 #include "actables.h" 49 50 #define _COMPONENT ACPI_EVENTS 51 ACPI_MODULE_NAME("evxfevnt") 52 53 #if (!ACPI_REDUCED_HARDWARE) /* Entire module */ 54 /******************************************************************************* 55 * 56 * FUNCTION: acpi_enable 57 * 58 * PARAMETERS: None 59 * 60 * RETURN: Status 61 * 62 * DESCRIPTION: Transfers the system into ACPI mode. 63 * 64 ******************************************************************************/ 65 acpi_status acpi_enable(void) 66 { 67 acpi_status status; 68 int retry; 69 70 ACPI_FUNCTION_TRACE(acpi_enable); 71 72 /* ACPI tables must be present */ 73 74 if (acpi_gbl_fadt_index == ACPI_INVALID_TABLE_INDEX) { 75 return_ACPI_STATUS(AE_NO_ACPI_TABLES); 76 } 77 78 /* If the Hardware Reduced flag is set, machine is always in acpi mode */ 79 80 if (acpi_gbl_reduced_hardware) { 81 return_ACPI_STATUS(AE_OK); 82 } 83 84 /* Check current mode */ 85 86 if (acpi_hw_get_mode() == ACPI_SYS_MODE_ACPI) { 87 ACPI_DEBUG_PRINT((ACPI_DB_INIT, 88 "System is already in ACPI mode\n")); 89 return_ACPI_STATUS(AE_OK); 90 } 91 92 /* Transition to ACPI mode */ 93 94 status = acpi_hw_set_mode(ACPI_SYS_MODE_ACPI); 95 if (ACPI_FAILURE(status)) { 96 ACPI_ERROR((AE_INFO, 97 "Could not transition to ACPI mode")); 98 return_ACPI_STATUS(status); 99 } 100 101 /* Sanity check that transition succeeded */ 102 103 for (retry = 0; retry < 30000; ++retry) { 104 if (acpi_hw_get_mode() == ACPI_SYS_MODE_ACPI) { 105 if (retry != 0) 106 ACPI_WARNING((AE_INFO, 107 "Platform took > %d00 usec to enter ACPI mode", retry)); 108 return_ACPI_STATUS(AE_OK); 109 } 110 acpi_os_stall(100); /* 100 usec */ 111 } 112 113 ACPI_ERROR((AE_INFO, "Hardware did not enter ACPI mode")); 114 return_ACPI_STATUS(AE_NO_HARDWARE_RESPONSE); 115 } 116 117 ACPI_EXPORT_SYMBOL(acpi_enable) 118 119 /******************************************************************************* 120 * 121 * FUNCTION: acpi_disable 122 * 123 * PARAMETERS: None 124 * 125 * RETURN: Status 126 * 127 * DESCRIPTION: Transfers the system into LEGACY (non-ACPI) mode. 128 * 129 ******************************************************************************/ 130 acpi_status acpi_disable(void) 131 { 132 acpi_status status = AE_OK; 133 134 ACPI_FUNCTION_TRACE(acpi_disable); 135 136 /* If the Hardware Reduced flag is set, machine is always in acpi mode */ 137 138 if (acpi_gbl_reduced_hardware) { 139 return_ACPI_STATUS(AE_OK); 140 } 141 142 if (acpi_hw_get_mode() == ACPI_SYS_MODE_LEGACY) { 143 ACPI_DEBUG_PRINT((ACPI_DB_INIT, 144 "System is already in legacy (non-ACPI) mode\n")); 145 } else { 146 /* Transition to LEGACY mode */ 147 148 status = acpi_hw_set_mode(ACPI_SYS_MODE_LEGACY); 149 150 if (ACPI_FAILURE(status)) { 151 ACPI_ERROR((AE_INFO, 152 "Could not exit ACPI mode to legacy mode")); 153 return_ACPI_STATUS(status); 154 } 155 156 ACPI_DEBUG_PRINT((ACPI_DB_INIT, "ACPI mode disabled\n")); 157 } 158 159 return_ACPI_STATUS(status); 160 } 161 162 ACPI_EXPORT_SYMBOL(acpi_disable) 163 164 /******************************************************************************* 165 * 166 * FUNCTION: acpi_enable_event 167 * 168 * PARAMETERS: event - The fixed eventto be enabled 169 * flags - Reserved 170 * 171 * RETURN: Status 172 * 173 * DESCRIPTION: Enable an ACPI event (fixed) 174 * 175 ******************************************************************************/ 176 acpi_status acpi_enable_event(u32 event, u32 flags) 177 { 178 acpi_status status = AE_OK; 179 u32 value; 180 181 ACPI_FUNCTION_TRACE(acpi_enable_event); 182 183 /* If Hardware Reduced flag is set, there are no fixed events */ 184 185 if (acpi_gbl_reduced_hardware) { 186 return_ACPI_STATUS(AE_OK); 187 } 188 189 /* Decode the Fixed Event */ 190 191 if (event > ACPI_EVENT_MAX) { 192 return_ACPI_STATUS(AE_BAD_PARAMETER); 193 } 194 195 /* 196 * Enable the requested fixed event (by writing a one to the enable 197 * register bit) 198 */ 199 status = 200 acpi_write_bit_register(acpi_gbl_fixed_event_info[event]. 201 enable_register_id, ACPI_ENABLE_EVENT); 202 if (ACPI_FAILURE(status)) { 203 return_ACPI_STATUS(status); 204 } 205 206 /* Make sure that the hardware responded */ 207 208 status = 209 acpi_read_bit_register(acpi_gbl_fixed_event_info[event]. 210 enable_register_id, &value); 211 if (ACPI_FAILURE(status)) { 212 return_ACPI_STATUS(status); 213 } 214 215 if (value != 1) { 216 ACPI_ERROR((AE_INFO, 217 "Could not enable %s event", 218 acpi_ut_get_event_name(event))); 219 return_ACPI_STATUS(AE_NO_HARDWARE_RESPONSE); 220 } 221 222 return_ACPI_STATUS(status); 223 } 224 225 ACPI_EXPORT_SYMBOL(acpi_enable_event) 226 227 /******************************************************************************* 228 * 229 * FUNCTION: acpi_disable_event 230 * 231 * PARAMETERS: event - The fixed event to be disabled 232 * flags - Reserved 233 * 234 * RETURN: Status 235 * 236 * DESCRIPTION: Disable an ACPI event (fixed) 237 * 238 ******************************************************************************/ 239 acpi_status acpi_disable_event(u32 event, u32 flags) 240 { 241 acpi_status status = AE_OK; 242 u32 value; 243 244 ACPI_FUNCTION_TRACE(acpi_disable_event); 245 246 /* If Hardware Reduced flag is set, there are no fixed events */ 247 248 if (acpi_gbl_reduced_hardware) { 249 return_ACPI_STATUS(AE_OK); 250 } 251 252 /* Decode the Fixed Event */ 253 254 if (event > ACPI_EVENT_MAX) { 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 = 263 acpi_write_bit_register(acpi_gbl_fixed_event_info[event]. 264 enable_register_id, ACPI_DISABLE_EVENT); 265 if (ACPI_FAILURE(status)) { 266 return_ACPI_STATUS(status); 267 } 268 269 status = 270 acpi_read_bit_register(acpi_gbl_fixed_event_info[event]. 271 enable_register_id, &value); 272 if (ACPI_FAILURE(status)) { 273 return_ACPI_STATUS(status); 274 } 275 276 if (value != 0) { 277 ACPI_ERROR((AE_INFO, 278 "Could not disable %s events", 279 acpi_ut_get_event_name(event))); 280 return_ACPI_STATUS(AE_NO_HARDWARE_RESPONSE); 281 } 282 283 return_ACPI_STATUS(status); 284 } 285 286 ACPI_EXPORT_SYMBOL(acpi_disable_event) 287 288 /******************************************************************************* 289 * 290 * FUNCTION: acpi_clear_event 291 * 292 * PARAMETERS: event - The fixed event to be cleared 293 * 294 * RETURN: Status 295 * 296 * DESCRIPTION: Clear an ACPI event (fixed) 297 * 298 ******************************************************************************/ 299 acpi_status acpi_clear_event(u32 event) 300 { 301 acpi_status status = AE_OK; 302 303 ACPI_FUNCTION_TRACE(acpi_clear_event); 304 305 /* If Hardware Reduced flag is set, there are no fixed events */ 306 307 if (acpi_gbl_reduced_hardware) { 308 return_ACPI_STATUS(AE_OK); 309 } 310 311 /* Decode the Fixed Event */ 312 313 if (event > ACPI_EVENT_MAX) { 314 return_ACPI_STATUS(AE_BAD_PARAMETER); 315 } 316 317 /* 318 * Clear the requested fixed event (By writing a one to the status 319 * register bit) 320 */ 321 status = 322 acpi_write_bit_register(acpi_gbl_fixed_event_info[event]. 323 status_register_id, ACPI_CLEAR_STATUS); 324 325 return_ACPI_STATUS(status); 326 } 327 328 ACPI_EXPORT_SYMBOL(acpi_clear_event) 329 330 /******************************************************************************* 331 * 332 * FUNCTION: acpi_get_event_status 333 * 334 * PARAMETERS: event - The fixed event 335 * event_status - Where the current status of the event will 336 * be returned 337 * 338 * RETURN: Status 339 * 340 * DESCRIPTION: Obtains and returns the current status of the event 341 * 342 ******************************************************************************/ 343 acpi_status acpi_get_event_status(u32 event, acpi_event_status * event_status) 344 { 345 acpi_status status; 346 acpi_event_status local_event_status = 0; 347 u32 in_byte; 348 349 ACPI_FUNCTION_TRACE(acpi_get_event_status); 350 351 if (!event_status) { 352 return_ACPI_STATUS(AE_BAD_PARAMETER); 353 } 354 355 /* Decode the Fixed Event */ 356 357 if (event > ACPI_EVENT_MAX) { 358 return_ACPI_STATUS(AE_BAD_PARAMETER); 359 } 360 361 /* Fixed event currently can be dispatched? */ 362 363 if (acpi_gbl_fixed_event_handlers[event].handler) { 364 local_event_status |= ACPI_EVENT_FLAG_HAS_HANDLER; 365 } 366 367 /* Fixed event currently enabled? */ 368 369 status = 370 acpi_read_bit_register(acpi_gbl_fixed_event_info[event]. 371 enable_register_id, &in_byte); 372 if (ACPI_FAILURE(status)) { 373 return_ACPI_STATUS(status); 374 } 375 376 if (in_byte) { 377 local_event_status |= 378 (ACPI_EVENT_FLAG_ENABLED | ACPI_EVENT_FLAG_ENABLE_SET); 379 } 380 381 /* Fixed event currently active? */ 382 383 status = 384 acpi_read_bit_register(acpi_gbl_fixed_event_info[event]. 385 status_register_id, &in_byte); 386 if (ACPI_FAILURE(status)) { 387 return_ACPI_STATUS(status); 388 } 389 390 if (in_byte) { 391 local_event_status |= ACPI_EVENT_FLAG_STATUS_SET; 392 } 393 394 (*event_status) = local_event_status; 395 return_ACPI_STATUS(AE_OK); 396 } 397 398 ACPI_EXPORT_SYMBOL(acpi_get_event_status) 399 #endif /* !ACPI_REDUCED_HARDWARE */ 400