1 /****************************************************************************** 2 * 3 * Module Name: evxfevnt - External Interfaces, ACPI event disable/enable 4 * 5 *****************************************************************************/ 6 7 /* 8 * Copyright (C) 2000 - 2013, 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 acpi_status acpi_enable(void) 65 { 66 acpi_status status; 67 int retry; 68 69 ACPI_FUNCTION_TRACE(acpi_enable); 70 71 /* ACPI tables must be present */ 72 73 if (!acpi_tb_tables_loaded()) { 74 return_ACPI_STATUS(AE_NO_ACPI_TABLES); 75 } 76 77 /* Check current mode */ 78 79 if (acpi_hw_get_mode() == ACPI_SYS_MODE_ACPI) { 80 ACPI_DEBUG_PRINT((ACPI_DB_INIT, 81 "System is already in ACPI mode\n")); 82 return_ACPI_STATUS(AE_OK); 83 } 84 85 /* Transition to ACPI mode */ 86 87 status = acpi_hw_set_mode(ACPI_SYS_MODE_ACPI); 88 if (ACPI_FAILURE(status)) { 89 ACPI_ERROR((AE_INFO, 90 "Could not transition to ACPI mode")); 91 return_ACPI_STATUS(status); 92 } 93 94 /* Sanity check that transition succeeded */ 95 96 for (retry = 0; retry < 30000; ++retry) { 97 if (acpi_hw_get_mode() == ACPI_SYS_MODE_ACPI) { 98 if (retry != 0) 99 ACPI_WARNING((AE_INFO, 100 "Platform took > %d00 usec to enter ACPI mode", retry)); 101 return_ACPI_STATUS(AE_OK); 102 } 103 acpi_os_stall(100); /* 100 usec */ 104 } 105 106 ACPI_ERROR((AE_INFO, "Hardware did not enter ACPI mode")); 107 return_ACPI_STATUS(AE_NO_HARDWARE_RESPONSE); 108 } 109 110 ACPI_EXPORT_SYMBOL(acpi_enable) 111 112 /******************************************************************************* 113 * 114 * FUNCTION: acpi_disable 115 * 116 * PARAMETERS: None 117 * 118 * RETURN: Status 119 * 120 * DESCRIPTION: Transfers the system into LEGACY (non-ACPI) mode. 121 * 122 ******************************************************************************/ 123 acpi_status acpi_disable(void) 124 { 125 acpi_status status = AE_OK; 126 127 ACPI_FUNCTION_TRACE(acpi_disable); 128 129 if (acpi_hw_get_mode() == ACPI_SYS_MODE_LEGACY) { 130 ACPI_DEBUG_PRINT((ACPI_DB_INIT, 131 "System is already in legacy (non-ACPI) mode\n")); 132 } else { 133 /* Transition to LEGACY mode */ 134 135 status = acpi_hw_set_mode(ACPI_SYS_MODE_LEGACY); 136 137 if (ACPI_FAILURE(status)) { 138 ACPI_ERROR((AE_INFO, 139 "Could not exit ACPI mode to legacy mode")); 140 return_ACPI_STATUS(status); 141 } 142 143 ACPI_DEBUG_PRINT((ACPI_DB_INIT, "ACPI mode disabled\n")); 144 } 145 146 return_ACPI_STATUS(status); 147 } 148 149 ACPI_EXPORT_SYMBOL(acpi_disable) 150 151 /******************************************************************************* 152 * 153 * FUNCTION: acpi_enable_event 154 * 155 * PARAMETERS: event - The fixed eventto be enabled 156 * flags - Reserved 157 * 158 * RETURN: Status 159 * 160 * DESCRIPTION: Enable an ACPI event (fixed) 161 * 162 ******************************************************************************/ 163 acpi_status acpi_enable_event(u32 event, u32 flags) 164 { 165 acpi_status status = AE_OK; 166 u32 value; 167 168 ACPI_FUNCTION_TRACE(acpi_enable_event); 169 170 /* Decode the Fixed Event */ 171 172 if (event > ACPI_EVENT_MAX) { 173 return_ACPI_STATUS(AE_BAD_PARAMETER); 174 } 175 176 /* 177 * Enable the requested fixed event (by writing a one to the enable 178 * register bit) 179 */ 180 status = 181 acpi_write_bit_register(acpi_gbl_fixed_event_info[event]. 182 enable_register_id, ACPI_ENABLE_EVENT); 183 if (ACPI_FAILURE(status)) { 184 return_ACPI_STATUS(status); 185 } 186 187 /* Make sure that the hardware responded */ 188 189 status = 190 acpi_read_bit_register(acpi_gbl_fixed_event_info[event]. 191 enable_register_id, &value); 192 if (ACPI_FAILURE(status)) { 193 return_ACPI_STATUS(status); 194 } 195 196 if (value != 1) { 197 ACPI_ERROR((AE_INFO, 198 "Could not enable %s event", 199 acpi_ut_get_event_name(event))); 200 return_ACPI_STATUS(AE_NO_HARDWARE_RESPONSE); 201 } 202 203 return_ACPI_STATUS(status); 204 } 205 206 ACPI_EXPORT_SYMBOL(acpi_enable_event) 207 208 /******************************************************************************* 209 * 210 * FUNCTION: acpi_disable_event 211 * 212 * PARAMETERS: event - The fixed event to be disabled 213 * flags - Reserved 214 * 215 * RETURN: Status 216 * 217 * DESCRIPTION: Disable an ACPI event (fixed) 218 * 219 ******************************************************************************/ 220 acpi_status acpi_disable_event(u32 event, u32 flags) 221 { 222 acpi_status status = AE_OK; 223 u32 value; 224 225 ACPI_FUNCTION_TRACE(acpi_disable_event); 226 227 /* Decode the Fixed Event */ 228 229 if (event > ACPI_EVENT_MAX) { 230 return_ACPI_STATUS(AE_BAD_PARAMETER); 231 } 232 233 /* 234 * Disable the requested fixed event (by writing a zero to the enable 235 * register bit) 236 */ 237 status = 238 acpi_write_bit_register(acpi_gbl_fixed_event_info[event]. 239 enable_register_id, ACPI_DISABLE_EVENT); 240 if (ACPI_FAILURE(status)) { 241 return_ACPI_STATUS(status); 242 } 243 244 status = 245 acpi_read_bit_register(acpi_gbl_fixed_event_info[event]. 246 enable_register_id, &value); 247 if (ACPI_FAILURE(status)) { 248 return_ACPI_STATUS(status); 249 } 250 251 if (value != 0) { 252 ACPI_ERROR((AE_INFO, 253 "Could not disable %s events", 254 acpi_ut_get_event_name(event))); 255 return_ACPI_STATUS(AE_NO_HARDWARE_RESPONSE); 256 } 257 258 return_ACPI_STATUS(status); 259 } 260 261 ACPI_EXPORT_SYMBOL(acpi_disable_event) 262 263 /******************************************************************************* 264 * 265 * FUNCTION: acpi_clear_event 266 * 267 * PARAMETERS: event - The fixed event to be cleared 268 * 269 * RETURN: Status 270 * 271 * DESCRIPTION: Clear an ACPI event (fixed) 272 * 273 ******************************************************************************/ 274 acpi_status acpi_clear_event(u32 event) 275 { 276 acpi_status status = AE_OK; 277 278 ACPI_FUNCTION_TRACE(acpi_clear_event); 279 280 /* Decode the Fixed Event */ 281 282 if (event > ACPI_EVENT_MAX) { 283 return_ACPI_STATUS(AE_BAD_PARAMETER); 284 } 285 286 /* 287 * Clear the requested fixed event (By writing a one to the status 288 * register bit) 289 */ 290 status = 291 acpi_write_bit_register(acpi_gbl_fixed_event_info[event]. 292 status_register_id, ACPI_CLEAR_STATUS); 293 294 return_ACPI_STATUS(status); 295 } 296 297 ACPI_EXPORT_SYMBOL(acpi_clear_event) 298 299 /******************************************************************************* 300 * 301 * FUNCTION: acpi_get_event_status 302 * 303 * PARAMETERS: event - The fixed event 304 * event_status - Where the current status of the event will 305 * be returned 306 * 307 * RETURN: Status 308 * 309 * DESCRIPTION: Obtains and returns the current status of the event 310 * 311 ******************************************************************************/ 312 acpi_status acpi_get_event_status(u32 event, acpi_event_status * event_status) 313 { 314 acpi_status status = AE_OK; 315 u32 value; 316 317 ACPI_FUNCTION_TRACE(acpi_get_event_status); 318 319 if (!event_status) { 320 return_ACPI_STATUS(AE_BAD_PARAMETER); 321 } 322 323 /* Decode the Fixed Event */ 324 325 if (event > ACPI_EVENT_MAX) { 326 return_ACPI_STATUS(AE_BAD_PARAMETER); 327 } 328 329 /* Get the status of the requested fixed event */ 330 331 status = 332 acpi_read_bit_register(acpi_gbl_fixed_event_info[event]. 333 enable_register_id, &value); 334 if (ACPI_FAILURE(status)) 335 return_ACPI_STATUS(status); 336 337 *event_status = value; 338 339 status = 340 acpi_read_bit_register(acpi_gbl_fixed_event_info[event]. 341 status_register_id, &value); 342 if (ACPI_FAILURE(status)) 343 return_ACPI_STATUS(status); 344 345 if (value) 346 *event_status |= ACPI_EVENT_FLAG_SET; 347 348 if (acpi_gbl_fixed_event_handlers[event].handler) 349 *event_status |= ACPI_EVENT_FLAG_HANDLE; 350 351 return_ACPI_STATUS(status); 352 } 353 354 ACPI_EXPORT_SYMBOL(acpi_get_event_status) 355 #endif /* !ACPI_REDUCED_HARDWARE */ 356