1 /******************************************************************************
2 *
3 * Module Name: evxfevnt - External Interfaces, ACPI event disable/enable
4 *
5 *****************************************************************************/
6
7 /*
8 * Copyright (C) 2000 - 2022, 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 MERCHANTABILITY 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.h"
47 #include "accommon.h"
48 #include "actables.h"
49
50 #define _COMPONENT ACPI_EVENTS
51 ACPI_MODULE_NAME ("evxfevnt")
52
53
54 #if (!ACPI_REDUCED_HARDWARE) /* Entire module */
55 /*******************************************************************************
56 *
57 * FUNCTION: AcpiEnable
58 *
59 * PARAMETERS: None
60 *
61 * RETURN: Status
62 *
63 * DESCRIPTION: Transfers the system into ACPI mode.
64 *
65 ******************************************************************************/
66
67 ACPI_STATUS
AcpiEnable(void)68 AcpiEnable (
69 void)
70 {
71 ACPI_STATUS Status = AE_OK;
72
73
74 ACPI_FUNCTION_TRACE (AcpiEnable);
75
76
77 /* ACPI tables must be present */
78
79 if (AcpiGbl_FadtIndex == ACPI_INVALID_TABLE_INDEX)
80 {
81 return_ACPI_STATUS (AE_NO_ACPI_TABLES);
82 }
83
84 /* If the Hardware Reduced flag is set, machine is always in acpi mode */
85
86 if (AcpiGbl_ReducedHardware)
87 {
88 return_ACPI_STATUS (AE_OK);
89 }
90
91 /* Check current mode */
92
93 if (AcpiHwGetMode() == ACPI_SYS_MODE_ACPI)
94 {
95 ACPI_DEBUG_PRINT ((ACPI_DB_INIT,
96 "System is already in ACPI mode\n"));
97 }
98 else
99 {
100 /* Transition to ACPI mode */
101
102 Status = AcpiHwSetMode (ACPI_SYS_MODE_ACPI);
103 if (ACPI_FAILURE (Status))
104 {
105 ACPI_ERROR ((AE_INFO, "Could not transition to ACPI mode"));
106 return_ACPI_STATUS (Status);
107 }
108
109 ACPI_DEBUG_PRINT ((ACPI_DB_INIT,
110 "Transition to ACPI mode successful\n"));
111 }
112
113 return_ACPI_STATUS (Status);
114 }
115
ACPI_EXPORT_SYMBOL(AcpiEnable)116 ACPI_EXPORT_SYMBOL (AcpiEnable)
117
118
119 /*******************************************************************************
120 *
121 * FUNCTION: AcpiDisable
122 *
123 * PARAMETERS: None
124 *
125 * RETURN: Status
126 *
127 * DESCRIPTION: Transfers the system into LEGACY (non-ACPI) mode.
128 *
129 ******************************************************************************/
130
131 ACPI_STATUS
132 AcpiDisable (
133 void)
134 {
135 ACPI_STATUS Status = AE_OK;
136
137
138 ACPI_FUNCTION_TRACE (AcpiDisable);
139
140
141 /* If the Hardware Reduced flag is set, machine is always in acpi mode */
142
143 if (AcpiGbl_ReducedHardware)
144 {
145 return_ACPI_STATUS (AE_OK);
146 }
147
148 if (AcpiHwGetMode() == ACPI_SYS_MODE_LEGACY)
149 {
150 ACPI_DEBUG_PRINT ((ACPI_DB_INIT,
151 "System is already in legacy (non-ACPI) mode\n"));
152 }
153 else
154 {
155 /* Transition to LEGACY mode */
156
157 Status = AcpiHwSetMode (ACPI_SYS_MODE_LEGACY);
158
159 if (ACPI_FAILURE (Status))
160 {
161 ACPI_ERROR ((AE_INFO,
162 "Could not exit ACPI mode to legacy mode"));
163 return_ACPI_STATUS (Status);
164 }
165
166 ACPI_DEBUG_PRINT ((ACPI_DB_INIT,
167 "ACPI mode disabled\n"));
168 }
169
170 return_ACPI_STATUS (Status);
171 }
172
ACPI_EXPORT_SYMBOL(AcpiDisable)173 ACPI_EXPORT_SYMBOL (AcpiDisable)
174
175
176 /*******************************************************************************
177 *
178 * FUNCTION: AcpiEnableEvent
179 *
180 * PARAMETERS: Event - The fixed eventto be enabled
181 * Flags - Reserved
182 *
183 * RETURN: Status
184 *
185 * DESCRIPTION: Enable an ACPI event (fixed)
186 *
187 ******************************************************************************/
188
189 ACPI_STATUS
190 AcpiEnableEvent (
191 UINT32 Event,
192 UINT32 Flags)
193 {
194 ACPI_STATUS Status = AE_OK;
195 UINT32 Value;
196
197
198 ACPI_FUNCTION_TRACE (AcpiEnableEvent);
199
200
201 /* If Hardware Reduced flag is set, there are no fixed events */
202
203 if (AcpiGbl_ReducedHardware)
204 {
205 return_ACPI_STATUS (AE_OK);
206 }
207
208 /* Decode the Fixed Event */
209
210 if (Event > ACPI_EVENT_MAX)
211 {
212 return_ACPI_STATUS (AE_BAD_PARAMETER);
213 }
214
215 /*
216 * Enable the requested fixed event (by writing a one to the enable
217 * register bit)
218 */
219 Status = AcpiWriteBitRegister (
220 AcpiGbl_FixedEventInfo[Event].EnableRegisterId,
221 ACPI_ENABLE_EVENT);
222 if (ACPI_FAILURE (Status))
223 {
224 return_ACPI_STATUS (Status);
225 }
226
227 /* Make sure that the hardware responded */
228
229 Status = AcpiReadBitRegister (
230 AcpiGbl_FixedEventInfo[Event].EnableRegisterId, &Value);
231 if (ACPI_FAILURE (Status))
232 {
233 return_ACPI_STATUS (Status);
234 }
235
236 if (Value != 1)
237 {
238 ACPI_ERROR ((AE_INFO,
239 "Could not enable %s event", AcpiUtGetEventName (Event)));
240 return_ACPI_STATUS (AE_NO_HARDWARE_RESPONSE);
241 }
242
243 return_ACPI_STATUS (Status);
244 }
245
ACPI_EXPORT_SYMBOL(AcpiEnableEvent)246 ACPI_EXPORT_SYMBOL (AcpiEnableEvent)
247
248
249 /*******************************************************************************
250 *
251 * FUNCTION: AcpiDisableEvent
252 *
253 * PARAMETERS: Event - The fixed event to be disabled
254 * Flags - Reserved
255 *
256 * RETURN: Status
257 *
258 * DESCRIPTION: Disable an ACPI event (fixed)
259 *
260 ******************************************************************************/
261
262 ACPI_STATUS
263 AcpiDisableEvent (
264 UINT32 Event,
265 UINT32 Flags)
266 {
267 ACPI_STATUS Status = AE_OK;
268 UINT32 Value;
269
270
271 ACPI_FUNCTION_TRACE (AcpiDisableEvent);
272
273
274 /* If Hardware Reduced flag is set, there are no fixed events */
275
276 if (AcpiGbl_ReducedHardware)
277 {
278 return_ACPI_STATUS (AE_OK);
279 }
280
281 /* Decode the Fixed Event */
282
283 if (Event > ACPI_EVENT_MAX)
284 {
285 return_ACPI_STATUS (AE_BAD_PARAMETER);
286 }
287
288 /*
289 * Disable the requested fixed event (by writing a zero to the enable
290 * register bit)
291 */
292 Status = AcpiWriteBitRegister (
293 AcpiGbl_FixedEventInfo[Event].EnableRegisterId,
294 ACPI_DISABLE_EVENT);
295 if (ACPI_FAILURE (Status))
296 {
297 return_ACPI_STATUS (Status);
298 }
299
300 Status = AcpiReadBitRegister (
301 AcpiGbl_FixedEventInfo[Event].EnableRegisterId, &Value);
302 if (ACPI_FAILURE (Status))
303 {
304 return_ACPI_STATUS (Status);
305 }
306
307 if (Value != 0)
308 {
309 ACPI_ERROR ((AE_INFO,
310 "Could not disable %s events", AcpiUtGetEventName (Event)));
311 return_ACPI_STATUS (AE_NO_HARDWARE_RESPONSE);
312 }
313
314 return_ACPI_STATUS (Status);
315 }
316
ACPI_EXPORT_SYMBOL(AcpiDisableEvent)317 ACPI_EXPORT_SYMBOL (AcpiDisableEvent)
318
319
320 /*******************************************************************************
321 *
322 * FUNCTION: AcpiClearEvent
323 *
324 * PARAMETERS: Event - The fixed event to be cleared
325 *
326 * RETURN: Status
327 *
328 * DESCRIPTION: Clear an ACPI event (fixed)
329 *
330 ******************************************************************************/
331
332 ACPI_STATUS
333 AcpiClearEvent (
334 UINT32 Event)
335 {
336 ACPI_STATUS Status = AE_OK;
337
338
339 ACPI_FUNCTION_TRACE (AcpiClearEvent);
340
341
342 /* If Hardware Reduced flag is set, there are no fixed events */
343
344 if (AcpiGbl_ReducedHardware)
345 {
346 return_ACPI_STATUS (AE_OK);
347 }
348
349 /* Decode the Fixed Event */
350
351 if (Event > ACPI_EVENT_MAX)
352 {
353 return_ACPI_STATUS (AE_BAD_PARAMETER);
354 }
355
356 /*
357 * Clear the requested fixed event (By writing a one to the status
358 * register bit)
359 */
360 Status = AcpiWriteBitRegister (
361 AcpiGbl_FixedEventInfo[Event].StatusRegisterId,
362 ACPI_CLEAR_STATUS);
363
364 return_ACPI_STATUS (Status);
365 }
366
ACPI_EXPORT_SYMBOL(AcpiClearEvent)367 ACPI_EXPORT_SYMBOL (AcpiClearEvent)
368
369
370 /*******************************************************************************
371 *
372 * FUNCTION: AcpiGetEventStatus
373 *
374 * PARAMETERS: Event - The fixed event
375 * EventStatus - Where the current status of the event will
376 * be returned
377 *
378 * RETURN: Status
379 *
380 * DESCRIPTION: Obtains and returns the current status of the event
381 *
382 ******************************************************************************/
383
384 ACPI_STATUS
385 AcpiGetEventStatus (
386 UINT32 Event,
387 ACPI_EVENT_STATUS *EventStatus)
388 {
389 ACPI_STATUS Status;
390 ACPI_EVENT_STATUS LocalEventStatus = 0;
391 UINT32 InByte;
392
393
394 ACPI_FUNCTION_TRACE (AcpiGetEventStatus);
395
396
397 if (!EventStatus)
398 {
399 return_ACPI_STATUS (AE_BAD_PARAMETER);
400 }
401
402 /* Decode the Fixed Event */
403
404 if (Event > ACPI_EVENT_MAX)
405 {
406 return_ACPI_STATUS (AE_BAD_PARAMETER);
407 }
408
409 /* Fixed event currently can be dispatched? */
410
411 if (AcpiGbl_FixedEventHandlers[Event].Handler)
412 {
413 LocalEventStatus |= ACPI_EVENT_FLAG_HAS_HANDLER;
414 }
415
416 /* Fixed event currently enabled? */
417
418 Status = AcpiReadBitRegister (
419 AcpiGbl_FixedEventInfo[Event].EnableRegisterId, &InByte);
420 if (ACPI_FAILURE (Status))
421 {
422 return_ACPI_STATUS (Status);
423 }
424
425 if (InByte)
426 {
427 LocalEventStatus |=
428 (ACPI_EVENT_FLAG_ENABLED | ACPI_EVENT_FLAG_ENABLE_SET);
429 }
430
431 /* Fixed event currently active? */
432
433 Status = AcpiReadBitRegister (
434 AcpiGbl_FixedEventInfo[Event].StatusRegisterId, &InByte);
435 if (ACPI_FAILURE (Status))
436 {
437 return_ACPI_STATUS (Status);
438 }
439
440 if (InByte)
441 {
442 LocalEventStatus |= ACPI_EVENT_FLAG_STATUS_SET;
443 }
444
445 (*EventStatus) = LocalEventStatus;
446 return_ACPI_STATUS (AE_OK);
447 }
448
449 ACPI_EXPORT_SYMBOL (AcpiGetEventStatus)
450
451 #endif /* !ACPI_REDUCED_HARDWARE */
452