1 /****************************************************************************** 2 * 3 * Module Name: evxfevnt - External Interfaces, ACPI event disable/enable 4 * 5 *****************************************************************************/ 6 7 /* 8 * Copyright (C) 2000 - 2012, 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 #include <linux/export.h> 45 #include <acpi/acpi.h> 46 #include "accommon.h" 47 #include "actables.h" 48 49 #define _COMPONENT ACPI_EVENTS 50 ACPI_MODULE_NAME("evxfevnt") 51 52 #if (!ACPI_REDUCED_HARDWARE) /* Entire module */ 53 /******************************************************************************* 54 * 55 * FUNCTION: acpi_enable 56 * 57 * PARAMETERS: None 58 * 59 * RETURN: Status 60 * 61 * DESCRIPTION: Transfers the system into ACPI mode. 62 * 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_tb_tables_loaded()) { 75 return_ACPI_STATUS(AE_NO_ACPI_TABLES); 76 } 77 78 /* Check current mode */ 79 80 if (acpi_hw_get_mode() == ACPI_SYS_MODE_ACPI) { 81 ACPI_DEBUG_PRINT((ACPI_DB_INIT, 82 "System is already in ACPI mode\n")); 83 return_ACPI_STATUS(AE_OK); 84 } 85 86 /* Transition to ACPI mode */ 87 88 status = acpi_hw_set_mode(ACPI_SYS_MODE_ACPI); 89 if (ACPI_FAILURE(status)) { 90 ACPI_ERROR((AE_INFO, 91 "Could not transition to ACPI mode")); 92 return_ACPI_STATUS(status); 93 } 94 95 /* Sanity check that transition succeeded */ 96 97 for (retry = 0; retry < 30000; ++retry) { 98 if (acpi_hw_get_mode() == ACPI_SYS_MODE_ACPI) { 99 if (retry != 0) 100 ACPI_WARNING((AE_INFO, 101 "Platform took > %d00 usec to enter ACPI mode", retry)); 102 return_ACPI_STATUS(AE_OK); 103 } 104 acpi_os_stall(100); /* 100 usec */ 105 } 106 107 ACPI_ERROR((AE_INFO, "Hardware did not enter ACPI mode")); 108 return_ACPI_STATUS(AE_NO_HARDWARE_RESPONSE); 109 } 110 111 ACPI_EXPORT_SYMBOL(acpi_enable) 112 113 /******************************************************************************* 114 * 115 * FUNCTION: acpi_disable 116 * 117 * PARAMETERS: None 118 * 119 * RETURN: Status 120 * 121 * DESCRIPTION: Transfers the system into LEGACY (non-ACPI) mode. 122 * 123 ******************************************************************************/ 124 acpi_status acpi_disable(void) 125 { 126 acpi_status status = AE_OK; 127 128 ACPI_FUNCTION_TRACE(acpi_disable); 129 130 if (acpi_hw_get_mode() == ACPI_SYS_MODE_LEGACY) { 131 ACPI_DEBUG_PRINT((ACPI_DB_INIT, 132 "System is already in legacy (non-ACPI) mode\n")); 133 } else { 134 /* Transition to LEGACY mode */ 135 136 status = acpi_hw_set_mode(ACPI_SYS_MODE_LEGACY); 137 138 if (ACPI_FAILURE(status)) { 139 ACPI_ERROR((AE_INFO, 140 "Could not exit ACPI mode to legacy mode")); 141 return_ACPI_STATUS(status); 142 } 143 144 ACPI_DEBUG_PRINT((ACPI_DB_INIT, "ACPI mode disabled\n")); 145 } 146 147 return_ACPI_STATUS(status); 148 } 149 150 ACPI_EXPORT_SYMBOL(acpi_disable) 151 152 /******************************************************************************* 153 * 154 * FUNCTION: acpi_enable_event 155 * 156 * PARAMETERS: event - The fixed eventto be enabled 157 * flags - Reserved 158 * 159 * RETURN: Status 160 * 161 * DESCRIPTION: Enable an ACPI event (fixed) 162 * 163 ******************************************************************************/ 164 acpi_status acpi_enable_event(u32 event, u32 flags) 165 { 166 acpi_status status = AE_OK; 167 u32 value; 168 169 ACPI_FUNCTION_TRACE(acpi_enable_event); 170 171 /* Decode the Fixed Event */ 172 173 if (event > ACPI_EVENT_MAX) { 174 return_ACPI_STATUS(AE_BAD_PARAMETER); 175 } 176 177 /* 178 * Enable the requested fixed event (by writing a one to the enable 179 * register bit) 180 */ 181 status = 182 acpi_write_bit_register(acpi_gbl_fixed_event_info[event]. 183 enable_register_id, ACPI_ENABLE_EVENT); 184 if (ACPI_FAILURE(status)) { 185 return_ACPI_STATUS(status); 186 } 187 188 /* Make sure that the hardware responded */ 189 190 status = 191 acpi_read_bit_register(acpi_gbl_fixed_event_info[event]. 192 enable_register_id, &value); 193 if (ACPI_FAILURE(status)) { 194 return_ACPI_STATUS(status); 195 } 196 197 if (value != 1) { 198 ACPI_ERROR((AE_INFO, 199 "Could not enable %s event", 200 acpi_ut_get_event_name(event))); 201 return_ACPI_STATUS(AE_NO_HARDWARE_RESPONSE); 202 } 203 204 return_ACPI_STATUS(status); 205 } 206 207 ACPI_EXPORT_SYMBOL(acpi_enable_event) 208 209 /******************************************************************************* 210 * 211 * FUNCTION: acpi_disable_event 212 * 213 * PARAMETERS: Event - The fixed eventto be enabled 214 * Flags - Reserved 215 * 216 * RETURN: Status 217 * 218 * DESCRIPTION: Disable an ACPI event (fixed) 219 * 220 ******************************************************************************/ 221 acpi_status acpi_disable_event(u32 event, u32 flags) 222 { 223 acpi_status status = AE_OK; 224 u32 value; 225 226 ACPI_FUNCTION_TRACE(acpi_disable_event); 227 228 /* Decode the Fixed Event */ 229 230 if (event > ACPI_EVENT_MAX) { 231 return_ACPI_STATUS(AE_BAD_PARAMETER); 232 } 233 234 /* 235 * Disable the requested fixed event (by writing a zero to the enable 236 * register bit) 237 */ 238 status = 239 acpi_write_bit_register(acpi_gbl_fixed_event_info[event]. 240 enable_register_id, ACPI_DISABLE_EVENT); 241 if (ACPI_FAILURE(status)) { 242 return_ACPI_STATUS(status); 243 } 244 245 status = 246 acpi_read_bit_register(acpi_gbl_fixed_event_info[event]. 247 enable_register_id, &value); 248 if (ACPI_FAILURE(status)) { 249 return_ACPI_STATUS(status); 250 } 251 252 if (value != 0) { 253 ACPI_ERROR((AE_INFO, 254 "Could not disable %s events", 255 acpi_ut_get_event_name(event))); 256 return_ACPI_STATUS(AE_NO_HARDWARE_RESPONSE); 257 } 258 259 return_ACPI_STATUS(status); 260 } 261 262 ACPI_EXPORT_SYMBOL(acpi_disable_event) 263 264 /******************************************************************************* 265 * 266 * FUNCTION: acpi_clear_event 267 * 268 * PARAMETERS: event - The fixed event to be cleared 269 * 270 * RETURN: Status 271 * 272 * DESCRIPTION: Clear an ACPI event (fixed) 273 * 274 ******************************************************************************/ 275 acpi_status acpi_clear_event(u32 event) 276 { 277 acpi_status status = AE_OK; 278 279 ACPI_FUNCTION_TRACE(acpi_clear_event); 280 281 /* Decode the Fixed Event */ 282 283 if (event > ACPI_EVENT_MAX) { 284 return_ACPI_STATUS(AE_BAD_PARAMETER); 285 } 286 287 /* 288 * Clear the requested fixed event (By writing a one to the status 289 * register bit) 290 */ 291 status = 292 acpi_write_bit_register(acpi_gbl_fixed_event_info[event]. 293 status_register_id, ACPI_CLEAR_STATUS); 294 295 return_ACPI_STATUS(status); 296 } 297 298 ACPI_EXPORT_SYMBOL(acpi_clear_event) 299 300 /******************************************************************************* 301 * 302 * FUNCTION: acpi_get_event_status 303 * 304 * PARAMETERS: event - The fixed event 305 * event_status - Where the current status of the event will 306 * be returned 307 * 308 * RETURN: Status 309 * 310 * DESCRIPTION: Obtains and returns the current status of the event 311 * 312 ******************************************************************************/ 313 acpi_status acpi_get_event_status(u32 event, acpi_event_status * event_status) 314 { 315 acpi_status status = AE_OK; 316 u32 value; 317 318 ACPI_FUNCTION_TRACE(acpi_get_event_status); 319 320 if (!event_status) { 321 return_ACPI_STATUS(AE_BAD_PARAMETER); 322 } 323 324 /* Decode the Fixed Event */ 325 326 if (event > ACPI_EVENT_MAX) { 327 return_ACPI_STATUS(AE_BAD_PARAMETER); 328 } 329 330 /* Get the status of the requested fixed event */ 331 332 status = 333 acpi_read_bit_register(acpi_gbl_fixed_event_info[event]. 334 enable_register_id, &value); 335 if (ACPI_FAILURE(status)) 336 return_ACPI_STATUS(status); 337 338 *event_status = value; 339 340 status = 341 acpi_read_bit_register(acpi_gbl_fixed_event_info[event]. 342 status_register_id, &value); 343 if (ACPI_FAILURE(status)) 344 return_ACPI_STATUS(status); 345 346 if (value) 347 *event_status |= ACPI_EVENT_FLAG_SET; 348 349 if (acpi_gbl_fixed_event_handlers[event].handler) 350 *event_status |= ACPI_EVENT_FLAG_HANDLE; 351 352 return_ACPI_STATUS(status); 353 } 354 355 ACPI_EXPORT_SYMBOL(acpi_get_event_status) 356 #endif /* !ACPI_REDUCED_HARDWARE */ 357