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1da177e4 LT |
1 | /****************************************************************************** |
2 | * | |
3 | * Module Name: evxfevnt - External Interfaces, ACPI event disable/enable | |
4 | * | |
5 | *****************************************************************************/ | |
6 | ||
7 | /* | |
77848130 | 8 | * Copyright (C) 2000 - 2012, Intel Corp. |
1da177e4 LT |
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 | ||
214f2c90 | 44 | #include <linux/export.h> |
1da177e4 | 45 | #include <acpi/acpi.h> |
e2f7a777 | 46 | #include "accommon.h" |
e2f7a777 | 47 | #include "actables.h" |
1da177e4 LT |
48 | |
49 | #define _COMPONENT ACPI_EVENTS | |
4be44fcd | 50 | ACPI_MODULE_NAME("evxfevnt") |
1da177e4 | 51 | |
33620c54 | 52 | #if (!ACPI_REDUCED_HARDWARE) /* Entire module */ |
1da177e4 LT |
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 | ******************************************************************************/ | |
e97d6bf1 | 64 | |
4be44fcd | 65 | acpi_status acpi_enable(void) |
1da177e4 | 66 | { |
b430acbd | 67 | acpi_status status; |
3d695839 | 68 | int retry; |
1da177e4 | 69 | |
b229cf92 | 70 | ACPI_FUNCTION_TRACE(acpi_enable); |
1da177e4 | 71 | |
c857303a BM |
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 | ||
1da177e4 | 80 | if (acpi_hw_get_mode() == ACPI_SYS_MODE_ACPI) { |
4be44fcd LB |
81 | ACPI_DEBUG_PRINT((ACPI_DB_INIT, |
82 | "System is already in ACPI mode\n")); | |
b430acbd LB |
83 | return_ACPI_STATUS(AE_OK); |
84 | } | |
1da177e4 | 85 | |
b430acbd | 86 | /* Transition to ACPI mode */ |
1da177e4 | 87 | |
b430acbd LB |
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 | ||
3d695839 LB |
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 */ | |
1da177e4 LT |
105 | } |
106 | ||
3d695839 LB |
107 | ACPI_ERROR((AE_INFO, "Hardware did not enter ACPI mode")); |
108 | return_ACPI_STATUS(AE_NO_HARDWARE_RESPONSE); | |
1da177e4 LT |
109 | } |
110 | ||
8313524a BM |
111 | ACPI_EXPORT_SYMBOL(acpi_enable) |
112 | ||
1da177e4 LT |
113 | /******************************************************************************* |
114 | * | |
115 | * FUNCTION: acpi_disable | |
116 | * | |
117 | * PARAMETERS: None | |
118 | * | |
119 | * RETURN: Status | |
120 | * | |
44f6c012 | 121 | * DESCRIPTION: Transfers the system into LEGACY (non-ACPI) mode. |
1da177e4 LT |
122 | * |
123 | ******************************************************************************/ | |
4be44fcd | 124 | acpi_status acpi_disable(void) |
1da177e4 | 125 | { |
4be44fcd | 126 | acpi_status status = AE_OK; |
1da177e4 | 127 | |
b229cf92 | 128 | ACPI_FUNCTION_TRACE(acpi_disable); |
1da177e4 | 129 | |
1da177e4 | 130 | if (acpi_hw_get_mode() == ACPI_SYS_MODE_LEGACY) { |
4be44fcd LB |
131 | ACPI_DEBUG_PRINT((ACPI_DB_INIT, |
132 | "System is already in legacy (non-ACPI) mode\n")); | |
133 | } else { | |
1da177e4 LT |
134 | /* Transition to LEGACY mode */ |
135 | ||
4be44fcd | 136 | status = acpi_hw_set_mode(ACPI_SYS_MODE_LEGACY); |
1da177e4 | 137 | |
4be44fcd | 138 | if (ACPI_FAILURE(status)) { |
b8e4d893 BM |
139 | ACPI_ERROR((AE_INFO, |
140 | "Could not exit ACPI mode to legacy mode")); | |
4be44fcd | 141 | return_ACPI_STATUS(status); |
1da177e4 LT |
142 | } |
143 | ||
4be44fcd | 144 | ACPI_DEBUG_PRINT((ACPI_DB_INIT, "ACPI mode disabled\n")); |
1da177e4 LT |
145 | } |
146 | ||
4be44fcd | 147 | return_ACPI_STATUS(status); |
1da177e4 LT |
148 | } |
149 | ||
8313524a BM |
150 | ACPI_EXPORT_SYMBOL(acpi_disable) |
151 | ||
1da177e4 LT |
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 | ******************************************************************************/ | |
4be44fcd | 164 | acpi_status acpi_enable_event(u32 event, u32 flags) |
1da177e4 | 165 | { |
4be44fcd LB |
166 | acpi_status status = AE_OK; |
167 | u32 value; | |
1da177e4 | 168 | |
b229cf92 | 169 | ACPI_FUNCTION_TRACE(acpi_enable_event); |
1da177e4 LT |
170 | |
171 | /* Decode the Fixed Event */ | |
172 | ||
173 | if (event > ACPI_EVENT_MAX) { | |
4be44fcd | 174 | return_ACPI_STATUS(AE_BAD_PARAMETER); |
1da177e4 LT |
175 | } |
176 | ||
177 | /* | |
9f15fc66 BM |
178 | * Enable the requested fixed event (by writing a one to the enable |
179 | * register bit) | |
1da177e4 | 180 | */ |
4be44fcd | 181 | status = |
50ffba1b | 182 | acpi_write_bit_register(acpi_gbl_fixed_event_info[event]. |
768aaaf1 | 183 | enable_register_id, ACPI_ENABLE_EVENT); |
4be44fcd LB |
184 | if (ACPI_FAILURE(status)) { |
185 | return_ACPI_STATUS(status); | |
1da177e4 LT |
186 | } |
187 | ||
188 | /* Make sure that the hardware responded */ | |
189 | ||
4be44fcd | 190 | status = |
50ffba1b BM |
191 | acpi_read_bit_register(acpi_gbl_fixed_event_info[event]. |
192 | enable_register_id, &value); | |
4be44fcd LB |
193 | if (ACPI_FAILURE(status)) { |
194 | return_ACPI_STATUS(status); | |
1da177e4 LT |
195 | } |
196 | ||
197 | if (value != 1) { | |
b8e4d893 BM |
198 | ACPI_ERROR((AE_INFO, |
199 | "Could not enable %s event", | |
200 | acpi_ut_get_event_name(event))); | |
4be44fcd | 201 | return_ACPI_STATUS(AE_NO_HARDWARE_RESPONSE); |
1da177e4 LT |
202 | } |
203 | ||
4be44fcd | 204 | return_ACPI_STATUS(status); |
1da177e4 | 205 | } |
1da177e4 | 206 | |
8313524a | 207 | ACPI_EXPORT_SYMBOL(acpi_enable_event) |
1da177e4 | 208 | |
1da177e4 LT |
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 | ******************************************************************************/ | |
4be44fcd | 221 | acpi_status acpi_disable_event(u32 event, u32 flags) |
1da177e4 | 222 | { |
4be44fcd LB |
223 | acpi_status status = AE_OK; |
224 | u32 value; | |
1da177e4 | 225 | |
b229cf92 | 226 | ACPI_FUNCTION_TRACE(acpi_disable_event); |
1da177e4 LT |
227 | |
228 | /* Decode the Fixed Event */ | |
229 | ||
230 | if (event > ACPI_EVENT_MAX) { | |
4be44fcd | 231 | return_ACPI_STATUS(AE_BAD_PARAMETER); |
1da177e4 LT |
232 | } |
233 | ||
234 | /* | |
9f15fc66 BM |
235 | * Disable the requested fixed event (by writing a zero to the enable |
236 | * register bit) | |
1da177e4 | 237 | */ |
4be44fcd | 238 | status = |
50ffba1b | 239 | acpi_write_bit_register(acpi_gbl_fixed_event_info[event]. |
768aaaf1 | 240 | enable_register_id, ACPI_DISABLE_EVENT); |
4be44fcd LB |
241 | if (ACPI_FAILURE(status)) { |
242 | return_ACPI_STATUS(status); | |
1da177e4 LT |
243 | } |
244 | ||
4be44fcd | 245 | status = |
50ffba1b BM |
246 | acpi_read_bit_register(acpi_gbl_fixed_event_info[event]. |
247 | enable_register_id, &value); | |
4be44fcd LB |
248 | if (ACPI_FAILURE(status)) { |
249 | return_ACPI_STATUS(status); | |
1da177e4 LT |
250 | } |
251 | ||
252 | if (value != 0) { | |
b8e4d893 BM |
253 | ACPI_ERROR((AE_INFO, |
254 | "Could not disable %s events", | |
255 | acpi_ut_get_event_name(event))); | |
4be44fcd | 256 | return_ACPI_STATUS(AE_NO_HARDWARE_RESPONSE); |
1da177e4 LT |
257 | } |
258 | ||
4be44fcd | 259 | return_ACPI_STATUS(status); |
1da177e4 | 260 | } |
1da177e4 | 261 | |
8313524a | 262 | ACPI_EXPORT_SYMBOL(acpi_disable_event) |
1da177e4 LT |
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 | ******************************************************************************/ | |
4be44fcd | 275 | acpi_status acpi_clear_event(u32 event) |
1da177e4 | 276 | { |
4be44fcd | 277 | acpi_status status = AE_OK; |
1da177e4 | 278 | |
b229cf92 | 279 | ACPI_FUNCTION_TRACE(acpi_clear_event); |
1da177e4 LT |
280 | |
281 | /* Decode the Fixed Event */ | |
282 | ||
283 | if (event > ACPI_EVENT_MAX) { | |
4be44fcd | 284 | return_ACPI_STATUS(AE_BAD_PARAMETER); |
1da177e4 LT |
285 | } |
286 | ||
287 | /* | |
9f15fc66 BM |
288 | * Clear the requested fixed event (By writing a one to the status |
289 | * register bit) | |
1da177e4 | 290 | */ |
4be44fcd | 291 | status = |
50ffba1b | 292 | acpi_write_bit_register(acpi_gbl_fixed_event_info[event]. |
768aaaf1 | 293 | status_register_id, ACPI_CLEAR_STATUS); |
1da177e4 | 294 | |
4be44fcd | 295 | return_ACPI_STATUS(status); |
1da177e4 | 296 | } |
1da177e4 | 297 | |
8313524a | 298 | ACPI_EXPORT_SYMBOL(acpi_clear_event) |
1da177e4 | 299 | |
1da177e4 LT |
300 | /******************************************************************************* |
301 | * | |
302 | * FUNCTION: acpi_get_event_status | |
303 | * | |
304 | * PARAMETERS: Event - The fixed event | |
44f6c012 | 305 | * event_status - Where the current status of the event will |
1da177e4 LT |
306 | * be returned |
307 | * | |
308 | * RETURN: Status | |
309 | * | |
310 | * DESCRIPTION: Obtains and returns the current status of the event | |
311 | * | |
312 | ******************************************************************************/ | |
4be44fcd | 313 | acpi_status acpi_get_event_status(u32 event, acpi_event_status * event_status) |
1da177e4 | 314 | { |
4be44fcd | 315 | acpi_status status = AE_OK; |
71b58cbb | 316 | u32 value; |
1da177e4 | 317 | |
b229cf92 | 318 | ACPI_FUNCTION_TRACE(acpi_get_event_status); |
1da177e4 LT |
319 | |
320 | if (!event_status) { | |
4be44fcd | 321 | return_ACPI_STATUS(AE_BAD_PARAMETER); |
1da177e4 LT |
322 | } |
323 | ||
324 | /* Decode the Fixed Event */ | |
325 | ||
326 | if (event > ACPI_EVENT_MAX) { | |
4be44fcd | 327 | return_ACPI_STATUS(AE_BAD_PARAMETER); |
1da177e4 LT |
328 | } |
329 | ||
330 | /* Get the status of the requested fixed event */ | |
331 | ||
4be44fcd | 332 | status = |
50ffba1b | 333 | acpi_read_bit_register(acpi_gbl_fixed_event_info[event]. |
71b58cbb ZR |
334 | enable_register_id, &value); |
335 | if (ACPI_FAILURE(status)) | |
336 | return_ACPI_STATUS(status); | |
337 | ||
338 | *event_status = value; | |
339 | ||
340 | status = | |
50ffba1b | 341 | acpi_read_bit_register(acpi_gbl_fixed_event_info[event]. |
71b58cbb ZR |
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; | |
1da177e4 | 348 | |
ed206fac ZR |
349 | if (acpi_gbl_fixed_event_handlers[event].handler) |
350 | *event_status |= ACPI_EVENT_FLAG_HANDLE; | |
351 | ||
4be44fcd | 352 | return_ACPI_STATUS(status); |
1da177e4 LT |
353 | } |
354 | ||
8313524a | 355 | ACPI_EXPORT_SYMBOL(acpi_get_event_status) |
33620c54 | 356 | #endif /* !ACPI_REDUCED_HARDWARE */ |