1 /****************************************************************************** 2 * 3 * Module Name: evxfevnt - External Interfaces, ACPI event disable/enable 4 * 5 *****************************************************************************/ 6 7 /* 8 * Copyright (C) 2000 - 2016, 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 /* Decode the Fixed Event */ 184 185 if (event > ACPI_EVENT_MAX) { 186 return_ACPI_STATUS(AE_BAD_PARAMETER); 187 } 188 189 /* 190 * Enable the requested fixed event (by writing a one to the enable 191 * register bit) 192 */ 193 status = 194 acpi_write_bit_register(acpi_gbl_fixed_event_info[event]. 195 enable_register_id, ACPI_ENABLE_EVENT); 196 if (ACPI_FAILURE(status)) { 197 return_ACPI_STATUS(status); 198 } 199 200 /* Make sure that the hardware responded */ 201 202 status = 203 acpi_read_bit_register(acpi_gbl_fixed_event_info[event]. 204 enable_register_id, &value); 205 if (ACPI_FAILURE(status)) { 206 return_ACPI_STATUS(status); 207 } 208 209 if (value != 1) { 210 ACPI_ERROR((AE_INFO, 211 "Could not enable %s event", 212 acpi_ut_get_event_name(event))); 213 return_ACPI_STATUS(AE_NO_HARDWARE_RESPONSE); 214 } 215 216 return_ACPI_STATUS(status); 217 } 218 219 ACPI_EXPORT_SYMBOL(acpi_enable_event) 220 221 /******************************************************************************* 222 * 223 * FUNCTION: acpi_disable_event 224 * 225 * PARAMETERS: event - The fixed event to be disabled 226 * flags - Reserved 227 * 228 * RETURN: Status 229 * 230 * DESCRIPTION: Disable an ACPI event (fixed) 231 * 232 ******************************************************************************/ 233 acpi_status acpi_disable_event(u32 event, u32 flags) 234 { 235 acpi_status status = AE_OK; 236 u32 value; 237 238 ACPI_FUNCTION_TRACE(acpi_disable_event); 239 240 /* Decode the Fixed Event */ 241 242 if (event > ACPI_EVENT_MAX) { 243 return_ACPI_STATUS(AE_BAD_PARAMETER); 244 } 245 246 /* 247 * Disable the requested fixed event (by writing a zero to the enable 248 * register bit) 249 */ 250 status = 251 acpi_write_bit_register(acpi_gbl_fixed_event_info[event]. 252 enable_register_id, ACPI_DISABLE_EVENT); 253 if (ACPI_FAILURE(status)) { 254 return_ACPI_STATUS(status); 255 } 256 257 status = 258 acpi_read_bit_register(acpi_gbl_fixed_event_info[event]. 259 enable_register_id, &value); 260 if (ACPI_FAILURE(status)) { 261 return_ACPI_STATUS(status); 262 } 263 264 if (value != 0) { 265 ACPI_ERROR((AE_INFO, 266 "Could not disable %s events", 267 acpi_ut_get_event_name(event))); 268 return_ACPI_STATUS(AE_NO_HARDWARE_RESPONSE); 269 } 270 271 return_ACPI_STATUS(status); 272 } 273 274 ACPI_EXPORT_SYMBOL(acpi_disable_event) 275 276 /******************************************************************************* 277 * 278 * FUNCTION: acpi_clear_event 279 * 280 * PARAMETERS: event - The fixed event to be cleared 281 * 282 * RETURN: Status 283 * 284 * DESCRIPTION: Clear an ACPI event (fixed) 285 * 286 ******************************************************************************/ 287 acpi_status acpi_clear_event(u32 event) 288 { 289 acpi_status status = AE_OK; 290 291 ACPI_FUNCTION_TRACE(acpi_clear_event); 292 293 /* Decode the Fixed Event */ 294 295 if (event > ACPI_EVENT_MAX) { 296 return_ACPI_STATUS(AE_BAD_PARAMETER); 297 } 298 299 /* 300 * Clear the requested fixed event (By writing a one to the status 301 * register bit) 302 */ 303 status = 304 acpi_write_bit_register(acpi_gbl_fixed_event_info[event]. 305 status_register_id, ACPI_CLEAR_STATUS); 306 307 return_ACPI_STATUS(status); 308 } 309 310 ACPI_EXPORT_SYMBOL(acpi_clear_event) 311 312 /******************************************************************************* 313 * 314 * FUNCTION: acpi_get_event_status 315 * 316 * PARAMETERS: event - The fixed event 317 * event_status - Where the current status of the event will 318 * be returned 319 * 320 * RETURN: Status 321 * 322 * DESCRIPTION: Obtains and returns the current status of the event 323 * 324 ******************************************************************************/ 325 acpi_status acpi_get_event_status(u32 event, acpi_event_status * event_status) 326 { 327 acpi_status status; 328 acpi_event_status local_event_status = 0; 329 u32 in_byte; 330 331 ACPI_FUNCTION_TRACE(acpi_get_event_status); 332 333 if (!event_status) { 334 return_ACPI_STATUS(AE_BAD_PARAMETER); 335 } 336 337 /* Decode the Fixed Event */ 338 339 if (event > ACPI_EVENT_MAX) { 340 return_ACPI_STATUS(AE_BAD_PARAMETER); 341 } 342 343 /* Fixed event currently can be dispatched? */ 344 345 if (acpi_gbl_fixed_event_handlers[event].handler) { 346 local_event_status |= ACPI_EVENT_FLAG_HAS_HANDLER; 347 } 348 349 /* Fixed event currently enabled? */ 350 351 status = 352 acpi_read_bit_register(acpi_gbl_fixed_event_info[event]. 353 enable_register_id, &in_byte); 354 if (ACPI_FAILURE(status)) { 355 return_ACPI_STATUS(status); 356 } 357 358 if (in_byte) { 359 local_event_status |= 360 (ACPI_EVENT_FLAG_ENABLED | ACPI_EVENT_FLAG_ENABLE_SET); 361 } 362 363 /* Fixed event currently active? */ 364 365 status = 366 acpi_read_bit_register(acpi_gbl_fixed_event_info[event]. 367 status_register_id, &in_byte); 368 if (ACPI_FAILURE(status)) { 369 return_ACPI_STATUS(status); 370 } 371 372 if (in_byte) { 373 local_event_status |= ACPI_EVENT_FLAG_STATUS_SET; 374 } 375 376 (*event_status) = local_event_status; 377 return_ACPI_STATUS(AE_OK); 378 } 379 380 ACPI_EXPORT_SYMBOL(acpi_get_event_status) 381 #endif /* !ACPI_REDUCED_HARDWARE */ 382