1 /*-
2 * Copyright (c) 2001 Michael Smith
3 * All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * 1. Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 * notice, this list of conditions and the following disclaimer in the
12 * documentation and/or other materials provided with the distribution.
13 *
14 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
15 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
16 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
17 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
18 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
19 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
20 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
21 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
22 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
23 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
24 * SUCH DAMAGE.
25 */
26
27 #include <sys/cdefs.h>
28 #include "opt_acpi.h"
29 #include <sys/param.h>
30 #include <sys/kernel.h>
31 #include <sys/malloc.h>
32 #include <sys/bus.h>
33
34 #include <contrib/dev/acpica/include/acpi.h>
35 #include <contrib/dev/acpica/include/accommon.h>
36
37 #include <dev/acpica/acpivar.h>
38
39 /*
40 * ACPI power resource management.
41 *
42 * Power resource behaviour is slightly complicated by the fact that
43 * a single power resource may provide power for more than one device.
44 * Thus, we must track the device(s) being powered by a given power
45 * resource, and only deactivate it when there are no powered devices.
46 *
47 * Note that this only manages resources for known devices. There is an
48 * ugly case where we may turn off power to a device which is in use because
49 * we don't know that it depends on a given resource. We should perhaps
50 * try to be smarter about this, but a more complete solution would involve
51 * scanning all of the ACPI namespace to find devices we're not currently
52 * aware of, and this raises questions about whether they should be left
53 * on, turned off, etc.
54 */
55
56 static MALLOC_DEFINE(M_ACPIPWR, "acpipwr", "ACPI power resources");
57
58 /* Hooks for the ACPI CA debugging infrastructure */
59 #define _COMPONENT ACPI_POWERRES
60 ACPI_MODULE_NAME("POWERRES")
61
62 /* Return values from _STA on a power resource */
63 #define ACPI_PWR_OFF 0
64 #define ACPI_PWR_ON 1
65
66 /* A relationship between a power resource and a consumer. */
67 struct acpi_powerreference {
68 struct acpi_powerconsumer *ar_consumer;
69 struct acpi_powerresource *ar_resource;
70 TAILQ_ENTRY(acpi_powerreference) ar_rlink; /* link on resource list */
71 TAILQ_ENTRY(acpi_powerreference) ar_clink; /* link on consumer */
72 };
73
74 /* A power-managed device. */
75 struct acpi_powerconsumer {
76 /* Device which is powered */
77 ACPI_HANDLE ac_consumer;
78 int ac_state;
79 TAILQ_ENTRY(acpi_powerconsumer) ac_link;
80 TAILQ_HEAD(,acpi_powerreference) ac_references;
81 };
82
83 /* A power resource. */
84 struct acpi_powerresource {
85 TAILQ_ENTRY(acpi_powerresource) ap_link;
86 TAILQ_HEAD(,acpi_powerreference) ap_references;
87 ACPI_HANDLE ap_resource;
88 UINT64 ap_systemlevel;
89 UINT64 ap_order;
90 };
91
92 static TAILQ_HEAD(acpi_powerresource_list, acpi_powerresource)
93 acpi_powerresources = TAILQ_HEAD_INITIALIZER(acpi_powerresources);
94 static TAILQ_HEAD(acpi_powerconsumer_list, acpi_powerconsumer)
95 acpi_powerconsumers = TAILQ_HEAD_INITIALIZER(acpi_powerconsumers);
96 ACPI_SERIAL_DECL(powerres, "ACPI power resources");
97
98 static ACPI_STATUS acpi_pwr_register_consumer(ACPI_HANDLE consumer);
99 #ifdef notyet
100 static ACPI_STATUS acpi_pwr_deregister_consumer(ACPI_HANDLE consumer);
101 #endif /* notyet */
102 static ACPI_STATUS acpi_pwr_register_resource(ACPI_HANDLE res);
103 #ifdef notyet
104 static ACPI_STATUS acpi_pwr_deregister_resource(ACPI_HANDLE res);
105 #endif /* notyet */
106 static void acpi_pwr_reference_resource(ACPI_OBJECT *obj,
107 void *arg);
108 static int acpi_pwr_dereference_resource(struct acpi_powerconsumer
109 *pc);
110 static ACPI_STATUS acpi_pwr_switch_power(void);
111 static struct acpi_powerresource
112 *acpi_pwr_find_resource(ACPI_HANDLE res);
113 static struct acpi_powerconsumer
114 *acpi_pwr_find_consumer(ACPI_HANDLE consumer);
115
116 /*
117 * Register a power resource.
118 *
119 * It's OK to call this if we already know about the resource.
120 */
121 static ACPI_STATUS
acpi_pwr_register_resource(ACPI_HANDLE res)122 acpi_pwr_register_resource(ACPI_HANDLE res)
123 {
124 ACPI_STATUS status;
125 ACPI_BUFFER buf;
126 ACPI_OBJECT *obj;
127 struct acpi_powerresource *rp, *srp;
128
129 ACPI_FUNCTION_TRACE((char *)(uintptr_t)__func__);
130 ACPI_SERIAL_ASSERT(powerres);
131
132 rp = NULL;
133 buf.Pointer = NULL;
134
135 /* Look to see if we know about this resource */
136 if (acpi_pwr_find_resource(res) != NULL)
137 return_ACPI_STATUS (AE_OK); /* already know about it */
138
139 /* Allocate a new resource */
140 if ((rp = malloc(sizeof(*rp), M_ACPIPWR, M_NOWAIT | M_ZERO)) == NULL) {
141 status = AE_NO_MEMORY;
142 goto out;
143 }
144 TAILQ_INIT(&rp->ap_references);
145 rp->ap_resource = res;
146
147 /* Get the Power Resource object */
148 buf.Length = ACPI_ALLOCATE_BUFFER;
149 if (ACPI_FAILURE(status = AcpiEvaluateObject(res, NULL, NULL, &buf))) {
150 ACPI_DEBUG_PRINT((ACPI_DB_OBJECTS, "no power resource object\n"));
151 goto out;
152 }
153 obj = buf.Pointer;
154 if (obj->Type != ACPI_TYPE_POWER) {
155 ACPI_DEBUG_PRINT((ACPI_DB_OBJECTS,
156 "questionable power resource object %s\n",
157 acpi_name(res)));
158 status = AE_TYPE;
159 goto out;
160 }
161 rp->ap_systemlevel = obj->PowerResource.SystemLevel;
162 rp->ap_order = obj->PowerResource.ResourceOrder;
163
164 /* Sort the resource into the list */
165 status = AE_OK;
166 srp = TAILQ_FIRST(&acpi_powerresources);
167 if (srp == NULL || rp->ap_order < srp->ap_order) {
168 TAILQ_INSERT_HEAD(&acpi_powerresources, rp, ap_link);
169 goto done;
170 }
171 TAILQ_FOREACH(srp, &acpi_powerresources, ap_link) {
172 if (rp->ap_order < srp->ap_order) {
173 TAILQ_INSERT_BEFORE(srp, rp, ap_link);
174 goto done;
175 }
176 }
177 TAILQ_INSERT_TAIL(&acpi_powerresources, rp, ap_link);
178
179 done:
180 ACPI_DEBUG_PRINT((ACPI_DB_OBJECTS,
181 "registered power resource %s\n", acpi_name(res)));
182
183 out:
184 if (buf.Pointer != NULL)
185 AcpiOsFree(buf.Pointer);
186 if (ACPI_FAILURE(status) && rp != NULL)
187 free(rp, M_ACPIPWR);
188 return_ACPI_STATUS (status);
189 }
190
191 #ifdef notyet
192 /*
193 * Deregister a power resource.
194 */
195 static ACPI_STATUS
acpi_pwr_deregister_resource(ACPI_HANDLE res)196 acpi_pwr_deregister_resource(ACPI_HANDLE res)
197 {
198 struct acpi_powerresource *rp;
199
200 ACPI_FUNCTION_TRACE((char *)(uintptr_t)__func__);
201 ACPI_SERIAL_ASSERT(powerres);
202
203 rp = NULL;
204
205 /* Find the resource */
206 if ((rp = acpi_pwr_find_resource(res)) == NULL)
207 return_ACPI_STATUS (AE_BAD_PARAMETER);
208
209 /* Check that there are no consumers referencing this resource */
210 if (TAILQ_FIRST(&rp->ap_references) != NULL)
211 return_ACPI_STATUS (AE_BAD_PARAMETER);
212
213 /* Pull it off the list and free it */
214 TAILQ_REMOVE(&acpi_powerresources, rp, ap_link);
215 free(rp, M_ACPIPWR);
216
217 ACPI_DEBUG_PRINT((ACPI_DB_OBJECTS, "deregistered power resource %s\n",
218 acpi_name(res)));
219
220 return_ACPI_STATUS (AE_OK);
221 }
222 #endif /* notyet */
223
224 /*
225 * Register a power consumer.
226 *
227 * It's OK to call this if we already know about the consumer.
228 */
229 static ACPI_STATUS
acpi_pwr_register_consumer(ACPI_HANDLE consumer)230 acpi_pwr_register_consumer(ACPI_HANDLE consumer)
231 {
232 struct acpi_powerconsumer *pc;
233
234 ACPI_FUNCTION_TRACE((char *)(uintptr_t)__func__);
235 ACPI_SERIAL_ASSERT(powerres);
236
237 /* Check to see whether we know about this consumer already */
238 if (acpi_pwr_find_consumer(consumer) != NULL)
239 return_ACPI_STATUS (AE_OK);
240
241 /* Allocate a new power consumer */
242 if ((pc = malloc(sizeof(*pc), M_ACPIPWR, M_NOWAIT)) == NULL)
243 return_ACPI_STATUS (AE_NO_MEMORY);
244 TAILQ_INSERT_HEAD(&acpi_powerconsumers, pc, ac_link);
245 TAILQ_INIT(&pc->ac_references);
246 pc->ac_consumer = consumer;
247
248 /* XXX we should try to find its current state */
249 pc->ac_state = ACPI_STATE_UNKNOWN;
250
251 ACPI_DEBUG_PRINT((ACPI_DB_OBJECTS, "registered power consumer %s\n",
252 acpi_name(consumer)));
253
254 return_ACPI_STATUS (AE_OK);
255 }
256
257 #ifdef notyet
258 /*
259 * Deregister a power consumer.
260 *
261 * This should only be done once the consumer has been powered off.
262 * (XXX is this correct? Check once implemented)
263 */
264 static ACPI_STATUS
acpi_pwr_deregister_consumer(ACPI_HANDLE consumer)265 acpi_pwr_deregister_consumer(ACPI_HANDLE consumer)
266 {
267 struct acpi_powerconsumer *pc;
268
269 ACPI_FUNCTION_TRACE((char *)(uintptr_t)__func__);
270 ACPI_SERIAL_ASSERT(powerres);
271
272 /* Find the consumer */
273 if ((pc = acpi_pwr_find_consumer(consumer)) == NULL)
274 return_ACPI_STATUS (AE_BAD_PARAMETER);
275
276 /* Make sure the consumer's not referencing anything right now */
277 if (TAILQ_FIRST(&pc->ac_references) != NULL)
278 return_ACPI_STATUS (AE_BAD_PARAMETER);
279
280 /* Pull the consumer off the list and free it */
281 TAILQ_REMOVE(&acpi_powerconsumers, pc, ac_link);
282 free(pc, M_ACPIPWR);
283
284 ACPI_DEBUG_PRINT((ACPI_DB_OBJECTS, "deregistered power consumer %s\n",
285 acpi_name(consumer)));
286
287 return_ACPI_STATUS (AE_OK);
288 }
289 #endif /* notyet */
290
291 /*
292 * Set a power consumer to a particular power state.
293 */
294 ACPI_STATUS
acpi_pwr_switch_consumer(ACPI_HANDLE consumer,int state)295 acpi_pwr_switch_consumer(ACPI_HANDLE consumer, int state)
296 {
297 struct acpi_powerconsumer *pc;
298 ACPI_HANDLE method_handle, reslist_handle, pr0_handle;
299 ACPI_BUFFER reslist_buffer;
300 ACPI_OBJECT *reslist_object;
301 ACPI_STATUS status;
302 char *method_name, *reslist_name;
303
304 ACPI_FUNCTION_TRACE((char *)(uintptr_t)__func__);
305
306 /* It's never ok to switch a non-existent consumer. */
307 if (consumer == NULL)
308 return_ACPI_STATUS (AE_NOT_FOUND);
309 reslist_buffer.Pointer = NULL;
310 reslist_object = NULL;
311 ACPI_SERIAL_BEGIN(powerres);
312
313 /* Find the consumer */
314 if ((pc = acpi_pwr_find_consumer(consumer)) == NULL) {
315 if (ACPI_FAILURE(status = acpi_pwr_register_consumer(consumer)))
316 goto out;
317 if ((pc = acpi_pwr_find_consumer(consumer)) == NULL)
318 panic("acpi added power consumer but can't find it");
319 }
320
321 /* Check for valid transitions. We can only go to D0 from D3. */
322 status = AE_BAD_PARAMETER;
323 if (pc->ac_state == ACPI_STATE_D3 && state != ACPI_STATE_D0)
324 goto out;
325
326 /* Find transition mechanism(s) */
327 switch (state) {
328 case ACPI_STATE_D0:
329 method_name = "_PS0";
330 reslist_name = "_PR0";
331 break;
332 case ACPI_STATE_D1:
333 method_name = "_PS1";
334 reslist_name = "_PR1";
335 break;
336 case ACPI_STATE_D2:
337 method_name = "_PS2";
338 reslist_name = "_PR2";
339 break;
340 case ACPI_STATE_D3:
341 method_name = "_PS3";
342 reslist_name = "_PR3";
343 break;
344 default:
345 goto out;
346 }
347 ACPI_DEBUG_PRINT((ACPI_DB_OBJECTS, "setup to switch %s D%d -> D%d\n",
348 acpi_name(consumer), pc->ac_state, state));
349
350 /*
351 * Verify that this state is supported, ie. one of method or
352 * reslist must be present. We need to do this before we go
353 * dereferencing resources (since we might be trying to go to
354 * a state we don't support).
355 *
356 * Note that if any states are supported, the device has to
357 * support D0 and D3. It's never an error to try to go to
358 * D0.
359 */
360 if (ACPI_FAILURE(AcpiGetHandle(consumer, method_name, &method_handle)))
361 method_handle = NULL;
362 if (ACPI_FAILURE(AcpiGetHandle(consumer, reslist_name, &reslist_handle)))
363 reslist_handle = NULL;
364 if (reslist_handle == NULL && method_handle == NULL) {
365 if (state == ACPI_STATE_D0) {
366 pc->ac_state = ACPI_STATE_D0;
367 status = AE_OK;
368 goto out;
369 }
370 if (state != ACPI_STATE_D3) {
371 ACPI_DEBUG_PRINT((ACPI_DB_OBJECTS,
372 "attempt to set unsupported state D%d\n", state));
373 goto out;
374 }
375
376 /*
377 * Turn off the resources listed in _PR0 to go to D3. If there is
378 * no _PR0 method, this object doesn't support ACPI power states.
379 */
380 if (ACPI_FAILURE(AcpiGetHandle(consumer, "_PR0", &pr0_handle))) {
381 status = AE_NOT_FOUND;
382 ACPI_DEBUG_PRINT((ACPI_DB_OBJECTS,
383 "device missing _PR0 (desired state was D%d)\n", state));
384 goto out;
385 }
386 reslist_buffer.Length = ACPI_ALLOCATE_BUFFER;
387 status = AcpiEvaluateObject(pr0_handle, NULL, NULL, &reslist_buffer);
388 if (ACPI_FAILURE(status)) {
389 ACPI_DEBUG_PRINT((ACPI_DB_OBJECTS,
390 "can't evaluate _PR0 for device %s, state D%d\n",
391 acpi_name(consumer), state));
392 goto out;
393 }
394 reslist_object = (ACPI_OBJECT *)reslist_buffer.Pointer;
395 if (!ACPI_PKG_VALID(reslist_object, 1)) {
396 ACPI_DEBUG_PRINT((ACPI_DB_OBJECTS,
397 "invalid package object for state D%d\n", state));
398 status = AE_TYPE;
399 goto out;
400 }
401 AcpiOsFree(reslist_buffer.Pointer);
402 reslist_buffer.Pointer = NULL;
403 reslist_object = NULL;
404 }
405
406 /*
407 * Check that we can actually fetch the list of power resources
408 */
409 if (reslist_handle != NULL) {
410 reslist_buffer.Length = ACPI_ALLOCATE_BUFFER;
411 status = AcpiEvaluateObject(reslist_handle, NULL, NULL,
412 &reslist_buffer);
413 if (ACPI_FAILURE(status)) {
414 ACPI_DEBUG_PRINT((ACPI_DB_OBJECTS,
415 "can't evaluate resource list %s\n",
416 acpi_name(reslist_handle)));
417 goto out;
418 }
419 reslist_object = (ACPI_OBJECT *)reslist_buffer.Pointer;
420 if (reslist_object->Type != ACPI_TYPE_PACKAGE) {
421 ACPI_DEBUG_PRINT((ACPI_DB_OBJECTS,
422 "resource list is not ACPI_TYPE_PACKAGE (%d)\n",
423 reslist_object->Type));
424 status = AE_TYPE;
425 goto out;
426 }
427 }
428
429 /*
430 * Now we are ready to switch, so kill off any current power
431 * resource references.
432 */
433 acpi_pwr_dereference_resource(pc);
434
435 /*
436 * Add new power resource references, if we have any. Traverse the
437 * package that we got from evaluating reslist_handle, and look up each
438 * of the resources that are referenced.
439 */
440 if (reslist_object != NULL) {
441 ACPI_DEBUG_PRINT((ACPI_DB_OBJECTS, "referencing %d new resources\n",
442 reslist_object->Package.Count));
443 acpi_ForeachPackageObject(reslist_object, acpi_pwr_reference_resource,
444 pc);
445 }
446
447 /*
448 * If we changed anything in the resource list, we need to run a switch
449 * pass now.
450 */
451 if (ACPI_FAILURE(status = acpi_pwr_switch_power())) {
452 ACPI_DEBUG_PRINT((ACPI_DB_OBJECTS,
453 "failed to switch resources from %s to D%d\n",
454 acpi_name(consumer), state));
455
456 /* XXX is this appropriate? Should we return to previous state? */
457 goto out;
458 }
459
460 /* Invoke power state switch method (if present) */
461 if (method_handle != NULL) {
462 ACPI_DEBUG_PRINT((ACPI_DB_OBJECTS,
463 "invoking state transition method %s\n",
464 acpi_name(method_handle)));
465 status = AcpiEvaluateObject(method_handle, NULL, NULL, NULL);
466 if (ACPI_FAILURE(status)) {
467 ACPI_DEBUG_PRINT((ACPI_DB_OBJECTS, "failed to set state - %s\n",
468 AcpiFormatException(status)));
469 pc->ac_state = ACPI_STATE_UNKNOWN;
470
471 /* XXX Should we return to previous state? */
472 goto out;
473 }
474 }
475
476 /* Transition was successful */
477 pc->ac_state = state;
478 status = AE_OK;
479
480 out:
481 ACPI_SERIAL_END(powerres);
482 if (reslist_buffer.Pointer != NULL)
483 AcpiOsFree(reslist_buffer.Pointer);
484 return_ACPI_STATUS (status);
485 }
486
487 /* Enable or disable a power resource for wake */
488 ACPI_STATUS
acpi_pwr_wake_enable(ACPI_HANDLE consumer,int enable)489 acpi_pwr_wake_enable(ACPI_HANDLE consumer, int enable)
490 {
491 ACPI_STATUS status;
492 struct acpi_powerconsumer *pc;
493 struct acpi_prw_data prw;
494 int i;
495
496 ACPI_FUNCTION_TRACE((char *)(uintptr_t)__func__);
497
498 if (consumer == NULL)
499 return (AE_BAD_PARAMETER);
500
501 ACPI_SERIAL_BEGIN(powerres);
502 if ((pc = acpi_pwr_find_consumer(consumer)) == NULL) {
503 if (ACPI_FAILURE(status = acpi_pwr_register_consumer(consumer)))
504 goto out;
505 if ((pc = acpi_pwr_find_consumer(consumer)) == NULL)
506 panic("acpi wake added power consumer but can't find it");
507 }
508
509 status = AE_OK;
510 if (acpi_parse_prw(consumer, &prw) != 0)
511 goto out;
512 for (i = 0; i < prw.power_res_count; i++)
513 if (enable)
514 acpi_pwr_reference_resource(&prw.power_res[i], pc);
515 else
516 acpi_pwr_dereference_resource(pc);
517
518 if (prw.power_res_count > 0)
519 acpi_pwr_switch_power();
520
521 out:
522 ACPI_SERIAL_END(powerres);
523 return (status);
524 }
525
526 /*
527 * Called to create a reference between a power consumer and a power resource
528 * identified in the object.
529 */
530 static void
acpi_pwr_reference_resource(ACPI_OBJECT * obj,void * arg)531 acpi_pwr_reference_resource(ACPI_OBJECT *obj, void *arg)
532 {
533 struct acpi_powerconsumer *pc = (struct acpi_powerconsumer *)arg;
534 struct acpi_powerreference *pr;
535 struct acpi_powerresource *rp;
536 ACPI_HANDLE res;
537 ACPI_STATUS status;
538
539 ACPI_FUNCTION_TRACE((char *)(uintptr_t)__func__);
540 ACPI_SERIAL_ASSERT(powerres);
541
542 res = acpi_GetReference(NULL, obj);
543 if (res == NULL) {
544 ACPI_DEBUG_PRINT((ACPI_DB_OBJECTS,
545 "can't create a power reference for object type %d\n",
546 obj->Type));
547 return_VOID;
548 }
549
550 /* Create/look up the resource */
551 if (ACPI_FAILURE(status = acpi_pwr_register_resource(res))) {
552 ACPI_DEBUG_PRINT((ACPI_DB_OBJECTS,
553 "couldn't register power resource %s - %s\n",
554 obj->String.Pointer, AcpiFormatException(status)));
555 return_VOID;
556 }
557 if ((rp = acpi_pwr_find_resource(res)) == NULL) {
558 ACPI_DEBUG_PRINT((ACPI_DB_OBJECTS, "power resource list corrupted\n"));
559 return_VOID;
560 }
561 ACPI_DEBUG_PRINT((ACPI_DB_OBJECTS, "found power resource %s\n",
562 acpi_name(rp->ap_resource)));
563
564 /* Create a reference between the consumer and resource */
565 if ((pr = malloc(sizeof(*pr), M_ACPIPWR, M_NOWAIT | M_ZERO)) == NULL) {
566 ACPI_DEBUG_PRINT((ACPI_DB_OBJECTS,
567 "allocation failed for a power consumer reference\n"));
568 return_VOID;
569 }
570 pr->ar_consumer = pc;
571 pr->ar_resource = rp;
572 TAILQ_INSERT_TAIL(&pc->ac_references, pr, ar_clink);
573 TAILQ_INSERT_TAIL(&rp->ap_references, pr, ar_rlink);
574
575 return_VOID;
576 }
577
578 static int
acpi_pwr_dereference_resource(struct acpi_powerconsumer * pc)579 acpi_pwr_dereference_resource(struct acpi_powerconsumer *pc)
580 {
581 struct acpi_powerreference *pr;
582 int changed;
583
584 ACPI_FUNCTION_TRACE((char *)(uintptr_t)__func__);
585 ACPI_SERIAL_ASSERT(powerres);
586
587 changed = 0;
588 while ((pr = TAILQ_FIRST(&pc->ac_references)) != NULL) {
589 ACPI_DEBUG_PRINT((ACPI_DB_OBJECTS, "removing reference to %s\n",
590 acpi_name(pr->ar_resource->ap_resource)));
591 TAILQ_REMOVE(&pr->ar_resource->ap_references, pr, ar_rlink);
592 TAILQ_REMOVE(&pc->ac_references, pr, ar_clink);
593 free(pr, M_ACPIPWR);
594 changed = 1;
595 }
596
597 return (changed);
598 }
599
600 /*
601 * Switch power resources to conform to the desired state.
602 *
603 * Consumers may have modified the power resource list in an arbitrary
604 * fashion; we sweep it in sequence order.
605 */
606 static ACPI_STATUS
acpi_pwr_switch_power(void)607 acpi_pwr_switch_power(void)
608 {
609 struct acpi_powerresource *rp;
610 ACPI_STATUS status;
611 int cur;
612
613 ACPI_FUNCTION_TRACE((char *)(uintptr_t)__func__);
614 ACPI_SERIAL_ASSERT(powerres);
615
616 /*
617 * Sweep the list forwards turning things on.
618 */
619 TAILQ_FOREACH(rp, &acpi_powerresources, ap_link) {
620 if (TAILQ_FIRST(&rp->ap_references) == NULL) {
621 ACPI_DEBUG_PRINT((ACPI_DB_OBJECTS,
622 "%s has no references, not turning on\n",
623 acpi_name(rp->ap_resource)));
624 continue;
625 }
626
627 status = acpi_GetInteger(rp->ap_resource, "_STA", &cur);
628 if (ACPI_FAILURE(status)) {
629 ACPI_DEBUG_PRINT((ACPI_DB_OBJECTS, "can't get status of %s - %d\n",
630 acpi_name(rp->ap_resource), status));
631 /* XXX is this correct? Always switch if in doubt? */
632 continue;
633 }
634
635 /*
636 * Switch if required. Note that we ignore the result of the switch
637 * effort; we don't know what to do if it fails, so checking wouldn't
638 * help much.
639 */
640 if (cur != ACPI_PWR_ON) {
641 status = AcpiEvaluateObject(rp->ap_resource, "_ON", NULL, NULL);
642 if (ACPI_FAILURE(status)) {
643 ACPI_DEBUG_PRINT((ACPI_DB_OBJECTS,
644 "failed to switch %s on - %s\n",
645 acpi_name(rp->ap_resource),
646 AcpiFormatException(status)));
647 } else {
648 ACPI_DEBUG_PRINT((ACPI_DB_OBJECTS, "switched %s on\n",
649 acpi_name(rp->ap_resource)));
650 }
651 } else {
652 ACPI_DEBUG_PRINT((ACPI_DB_OBJECTS, "%s is already on\n",
653 acpi_name(rp->ap_resource)));
654 }
655 }
656
657 /* Sweep the list backwards turning things off. */
658 TAILQ_FOREACH_REVERSE(rp, &acpi_powerresources, acpi_powerresource_list,
659 ap_link) {
660 if (TAILQ_FIRST(&rp->ap_references) != NULL) {
661 ACPI_DEBUG_PRINT((ACPI_DB_OBJECTS,
662 "%s has references, not turning off\n",
663 acpi_name(rp->ap_resource)));
664 continue;
665 }
666
667 status = acpi_GetInteger(rp->ap_resource, "_STA", &cur);
668 if (ACPI_FAILURE(status)) {
669 ACPI_DEBUG_PRINT((ACPI_DB_OBJECTS, "can't get status of %s - %d\n",
670 acpi_name(rp->ap_resource), status));
671 /* XXX is this correct? Always switch if in doubt? */
672 continue;
673 }
674
675 /*
676 * Switch if required. Note that we ignore the result of the switch
677 * effort; we don't know what to do if it fails, so checking wouldn't
678 * help much.
679 */
680 if (cur != ACPI_PWR_OFF) {
681 status = AcpiEvaluateObject(rp->ap_resource, "_OFF", NULL, NULL);
682 if (ACPI_FAILURE(status)) {
683 ACPI_DEBUG_PRINT((ACPI_DB_OBJECTS,
684 "failed to switch %s off - %s\n",
685 acpi_name(rp->ap_resource),
686 AcpiFormatException(status)));
687 } else {
688 ACPI_DEBUG_PRINT((ACPI_DB_OBJECTS, "switched %s off\n",
689 acpi_name(rp->ap_resource)));
690 }
691 } else {
692 ACPI_DEBUG_PRINT((ACPI_DB_OBJECTS, "%s is already off\n",
693 acpi_name(rp->ap_resource)));
694 }
695 }
696
697 return_ACPI_STATUS (AE_OK);
698 }
699
700 /*
701 * Find a power resource's control structure.
702 */
703 static struct acpi_powerresource *
acpi_pwr_find_resource(ACPI_HANDLE res)704 acpi_pwr_find_resource(ACPI_HANDLE res)
705 {
706 struct acpi_powerresource *rp;
707
708 ACPI_FUNCTION_TRACE((char *)(uintptr_t)__func__);
709 ACPI_SERIAL_ASSERT(powerres);
710
711 TAILQ_FOREACH(rp, &acpi_powerresources, ap_link) {
712 if (rp->ap_resource == res)
713 break;
714 }
715
716 return_PTR (rp);
717 }
718
719 /*
720 * Find a power consumer's control structure.
721 */
722 static struct acpi_powerconsumer *
acpi_pwr_find_consumer(ACPI_HANDLE consumer)723 acpi_pwr_find_consumer(ACPI_HANDLE consumer)
724 {
725 struct acpi_powerconsumer *pc;
726
727 ACPI_FUNCTION_TRACE((char *)(uintptr_t)__func__);
728 ACPI_SERIAL_ASSERT(powerres);
729
730 TAILQ_FOREACH(pc, &acpi_powerconsumers, ac_link) {
731 if (pc->ac_consumer == consumer)
732 break;
733 }
734
735 return_PTR (pc);
736 }
737