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 unchanged lines hidden (view full) ---
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 * $FreeBSD: head/sys/dev/acpica/acpi_powerres.c 91125 2002-02-23 05:28:22Z msmith $
27 */
28
29#include "opt_acpi.h" /* XXX trim includes */
30#include <sys/param.h>
31#include <sys/kernel.h>
32#include <sys/proc.h>
33#include <sys/lock.h>
34#include <sys/malloc.h>
--- 35 unchanged lines hidden (view full) ---
70 */
71
72MALLOC_DEFINE(M_ACPIPWR, "acpipwr", "ACPI power resources");
73
74/*
75 * Hooks for the ACPI CA debugging infrastructure
76 */
77#define _COMPONENT ACPI_POWER
78ACPI_MODULE_NAME("POWERRES")
79
80/* return values from _STA on a power resource */
81#define ACPI_PWR_OFF 0
82#define ACPI_PWR_ON 1
83
84/*
85 * A relationship between a power resource and a consumer.
86 */
--- 56 unchanged lines hidden (view full) ---
143static ACPI_STATUS
144acpi_pwr_register_resource(ACPI_HANDLE res)
145{
146 ACPI_STATUS status;
147 ACPI_BUFFER buf;
148 ACPI_OBJECT *obj;
149 struct acpi_powerresource *rp, *srp;
150
151 ACPI_FUNCTION_TRACE(__func__);
152
153 rp = NULL;
154 buf.Pointer = NULL;
155
156 /* look to see if we know about this resource */
157 if (acpi_pwr_find_resource(res) != NULL)
158 return_ACPI_STATUS(AE_OK); /* already know about it */
159
160 /* allocate a new resource */
161 if ((rp = malloc(sizeof(*rp), M_ACPIPWR, M_NOWAIT | M_ZERO)) == NULL) {
162 status = AE_NO_MEMORY;
163 goto out;
164 }
165 TAILQ_INIT(&rp->ap_references);
166 rp->ap_resource = res;
167
168 /* get the Power Resource object */
169 buf.Length = ACPI_ALLOCATE_BUFFER;
170 if (ACPI_FAILURE(status = AcpiEvaluateObject(res, NULL, NULL, &buf))) {
171 ACPI_DEBUG_PRINT((ACPI_DB_OBJECTS, "no power resource object\n"));
172 goto out;
173 }
174 obj = buf.Pointer;
175 if (obj->Type != ACPI_TYPE_POWER) {
176 ACPI_DEBUG_PRINT((ACPI_DB_OBJECTS, "questionable power resource object %s\n", acpi_name(res)));
177 status = AE_TYPE;
178 goto out;
--- 13 unchanged lines hidden (view full) ---
192 TAILQ_INSERT_BEFORE(srp, rp, ap_link);
193 goto done;
194 }
195 TAILQ_INSERT_TAIL(&acpi_powerresources, rp, ap_link);
196
197 done:
198 ACPI_DEBUG_PRINT((ACPI_DB_OBJECTS, "registered power resource %s\n", acpi_name(res)));
199 out:
200 if (buf.Pointer != NULL)
201 AcpiOsFree(buf.Pointer);
202 if (ACPI_FAILURE(status) && (rp != NULL))
203 free(rp, M_ACPIPWR);
204 return_ACPI_STATUS(status);
205}
206
207/*
208 * Deregister a power resource.
209 */
210static ACPI_STATUS
211acpi_pwr_deregister_resource(ACPI_HANDLE res)
212{
213 struct acpi_powerresource *rp;
214
215 ACPI_FUNCTION_TRACE(__func__);
216
217 rp = NULL;
218
219 /* find the resource */
220 if ((rp = acpi_pwr_find_resource(res)) == NULL)
221 return_ACPI_STATUS(AE_BAD_PARAMETER);
222
223 /* check that there are no consumers referencing this resource */
--- 14 unchanged lines hidden (view full) ---
238 *
239 * It's OK to call this if we already know about the consumer.
240 */
241static ACPI_STATUS
242acpi_pwr_register_consumer(ACPI_HANDLE consumer)
243{
244 struct acpi_powerconsumer *pc;
245
246 ACPI_FUNCTION_TRACE(__func__);
247
248 /* check to see whether we know about this consumer already */
249 if ((pc = acpi_pwr_find_consumer(consumer)) != NULL)
250 return_ACPI_STATUS(AE_OK);
251
252 /* allocate a new power consumer */
253 if ((pc = malloc(sizeof(*pc), M_ACPIPWR, M_NOWAIT)) == NULL)
254 return_ACPI_STATUS(AE_NO_MEMORY);
--- 14 unchanged lines hidden (view full) ---
269 * This should only be done once the consumer has been powered off.
270 * (XXX is this correct? Check once implemented)
271 */
272static ACPI_STATUS
273acpi_pwr_deregister_consumer(ACPI_HANDLE consumer)
274{
275 struct acpi_powerconsumer *pc;
276
277 ACPI_FUNCTION_TRACE(__func__);
278
279 /* find the consumer */
280 if ((pc = acpi_pwr_find_consumer(consumer)) == NULL)
281 return_ACPI_STATUS(AE_BAD_PARAMETER);
282
283 /* make sure the consumer's not referencing anything right now */
284 if (TAILQ_FIRST(&pc->ac_references) != NULL)
285 return_ACPI_STATUS(AE_BAD_PARAMETER);
--- 16 unchanged lines hidden (view full) ---
302 struct acpi_powerreference *pr;
303 ACPI_HANDLE method_handle, reslist_handle, pr0_handle;
304 ACPI_BUFFER reslist_buffer;
305 ACPI_OBJECT *reslist_object;
306 ACPI_STATUS status;
307 char *method_name, *reslist_name;
308 int res_changed;
309
310 ACPI_FUNCTION_TRACE(__func__);
311
312 /* find the consumer */
313 if ((pc = acpi_pwr_find_consumer(consumer)) == NULL) {
314 if (ACPI_FAILURE(status = acpi_pwr_register_consumer(consumer)))
315 return_ACPI_STATUS(status);
316 if ((pc = acpi_pwr_find_consumer(consumer)) == NULL) {
317 return_ACPI_STATUS(AE_ERROR); /* something very wrong */
318 }
319 }
320
321 /* check for valid transitions */
322 if ((pc->ac_state == ACPI_STATE_D3) && (state != ACPI_STATE_D0))
--- 28 unchanged lines hidden (view full) ---
351 * reslist must be present. We need to do this before we go
352 * dereferencing resources (since we might be trying to go to
353 * a state we don't support).
354 *
355 * Note that if any states are supported, the device has to
356 * support D0 and D3. It's never an error to try to go to
357 * D0.
358 */
359 reslist_buffer.Pointer = NULL;
360 reslist_object = NULL;
361 if (ACPI_FAILURE(AcpiGetHandle(consumer, method_name, &method_handle)))
362 method_handle = NULL;
363 if (ACPI_FAILURE(AcpiGetHandle(consumer, reslist_name, &reslist_handle)))
364 reslist_handle = NULL;
365 if ((reslist_handle == NULL) && (method_handle == NULL)) {
366 if (state == ACPI_STATE_D0) {
367 pc->ac_state = ACPI_STATE_D0;
368 return_ACPI_STATUS(AE_OK);
369 }
370 if (state != ACPI_STATE_D3) {
371 goto bad;
372 }
373
374 /* turn off the resources listed in _PR0 to go to D3. */
375 if (ACPI_FAILURE(AcpiGetHandle(consumer, "_PR0", &pr0_handle))) {
376 goto bad;
377 }
378 reslist_buffer.Length = ACPI_ALLOCATE_BUFFER;
379 if (ACPI_FAILURE(status = AcpiEvaluateObject(pr0_handle, NULL, NULL, &reslist_buffer))) {
380 goto bad;
381 }
382 reslist_object = (ACPI_OBJECT *)reslist_buffer.Pointer;
383 if ((reslist_object->Type != ACPI_TYPE_PACKAGE) ||
384 (reslist_object->Package.Count == 0)) {
385 goto bad;
386 }
387 AcpiOsFree(reslist_buffer.Pointer);
388 reslist_buffer.Pointer = NULL;
389 reslist_object = NULL;
390 }
391
392 /*
393 * Check that we can actually fetch the list of power resources
394 */
395 if (reslist_handle != NULL) {
396 reslist_buffer.Length = ACPI_ALLOCATE_BUFFER;
397 if (ACPI_FAILURE(status = AcpiEvaluateObject(reslist_handle, NULL, NULL, &reslist_buffer))) {
398 ACPI_DEBUG_PRINT((ACPI_DB_OBJECTS, "can't evaluate resource list %s\n",
399 acpi_name(reslist_handle)));
400 goto out;
401 }
402 reslist_object = (ACPI_OBJECT *)reslist_buffer.Pointer;
403 if (reslist_object->Type != ACPI_TYPE_PACKAGE) {
404 ACPI_DEBUG_PRINT((ACPI_DB_OBJECTS, "resource list is not ACPI_TYPE_PACKAGE (%d)\n",
405 reslist_object->Type));
406 status = AE_TYPE;
407 goto out;
408 }
409 }
410
411 /*
412 * Now we are ready to switch, so kill off any current power resource references.
413 */
414 res_changed = 0;
415 while((pr = TAILQ_FIRST(&pc->ac_references)) != NULL) {
416 res_changed = 1;
--- 14 unchanged lines hidden (view full) ---
431 acpi_ForeachPackageObject(reslist_object, acpi_pwr_reference_resource, pc);
432 res_changed = 1;
433 }
434
435 /*
436 * If we changed anything in the resource list, we need to run a switch
437 * pass now.
438 */
439 if (ACPI_FAILURE(status = acpi_pwr_switch_power())) {
440 ACPI_DEBUG_PRINT((ACPI_DB_OBJECTS, "failed to correctly switch resources to move %s to D%d\n",
441 acpi_name(consumer), state));
442 goto out; /* XXX is this appropriate? Should we return to previous state? */
443 }
444
445 /* invoke power state switch method (if present) */
446 if (method_handle != NULL) {
447 ACPI_DEBUG_PRINT((ACPI_DB_OBJECTS, "invoking state transition method %s\n",
448 acpi_name(method_handle)));
449 if (ACPI_FAILURE(status = AcpiEvaluateObject(method_handle, NULL, NULL, NULL))) {
450 ACPI_DEBUG_PRINT((ACPI_DB_OBJECTS, "failed to set state - %s\n",
451 AcpiFormatException(status)));
452 pc->ac_state = ACPI_STATE_UNKNOWN;
453 goto out; /* XXX Should we return to previous state? */
454 }
455 }
456
457 /* transition was successful */
458 pc->ac_state = state;
459 return_ACPI_STATUS(AE_OK);
460
461 bad:
462 ACPI_DEBUG_PRINT((ACPI_DB_OBJECTS, "attempt to set unsupported state D%d\n",
463 state));
464 status = AE_BAD_PARAMETER;
465
466 out:
467 if (reslist_buffer.Pointer != NULL)
468 AcpiOsFree(reslist_buffer.Pointer);
469 return_ACPI_STATUS(status);
470}
471
472/*
473 * Called to create a reference between a power consumer and a power resource
474 * identified in the object.
475 */
476static void
477acpi_pwr_reference_resource(ACPI_OBJECT *obj, void *arg)
478{
479 struct acpi_powerconsumer *pc = (struct acpi_powerconsumer *)arg;
480 struct acpi_powerreference *pr;
481 struct acpi_powerresource *rp;
482 ACPI_HANDLE res;
483 ACPI_STATUS status;
484
485 ACPI_FUNCTION_TRACE(__func__);
486
487 /* check the object type */
488 if (obj->Type != ACPI_TYPE_STRING) {
489 ACPI_DEBUG_PRINT((ACPI_DB_OBJECTS, "don't know how to create a power reference to object type %d\n",
490 obj->Type));
491 return_VOID;
492 }
493
--- 41 unchanged lines hidden (view full) ---
535 */
536static ACPI_STATUS
537acpi_pwr_switch_power(void)
538{
539 struct acpi_powerresource *rp;
540 ACPI_STATUS status;
541 int cur;
542
543 ACPI_FUNCTION_TRACE(__func__);
544
545 /*
546 * Sweep the list forwards turning things on.
547 */
548 TAILQ_FOREACH(rp, &acpi_powerresources, ap_link) {
549 if (TAILQ_FIRST(&rp->ap_references) == NULL) {
550 ACPI_DEBUG_PRINT((ACPI_DB_OBJECTS, "%s has no references, not turning on\n",
551 acpi_name(rp->ap_resource)));
552 continue;
553 }
554
555 /* we could cache this if we trusted it not to change under us */
556 if (ACPI_FAILURE(status = acpi_EvaluateInteger(rp->ap_resource, "_STA", &cur))) {
557 ACPI_DEBUG_PRINT((ACPI_DB_OBJECTS, "can't get status of %s - %d\n",
558 acpi_name(rp->ap_resource), status));
559 continue; /* XXX is this correct? Always switch if in doubt? */
560 }
561
562 /*
563 * Switch if required. Note that we ignore the result of the switch
564 * effort; we don't know what to do if it fails, so checking wouldn't
--- 17 unchanged lines hidden (view full) ---
582 TAILQ_FOREACH_REVERSE(rp, &acpi_powerresources, acpi_powerresource_list, ap_link) {
583 if (TAILQ_FIRST(&rp->ap_references) != NULL) {
584 ACPI_DEBUG_PRINT((ACPI_DB_OBJECTS, "%s has references, not turning off\n",
585 acpi_name(rp->ap_resource)));
586 continue;
587 }
588
589 /* we could cache this if we trusted it not to change under us */
590 if (ACPI_FAILURE(status = acpi_EvaluateInteger(rp->ap_resource, "_STA", &cur))) {
591 ACPI_DEBUG_PRINT((ACPI_DB_OBJECTS, "can't get status of %s - %d\n",
592 acpi_name(rp->ap_resource), status));
593 continue; /* XXX is this correct? Always switch if in doubt? */
594 }
595
596 /*
597 * Switch if required. Note that we ignore the result of the switch
598 * effort; we don't know what to do if it fails, so checking wouldn't
--- 16 unchanged lines hidden (view full) ---
615/*
616 * Find a power resource's control structure.
617 */
618static struct acpi_powerresource *
619acpi_pwr_find_resource(ACPI_HANDLE res)
620{
621 struct acpi_powerresource *rp;
622
623 ACPI_FUNCTION_TRACE(__func__);
624
625 TAILQ_FOREACH(rp, &acpi_powerresources, ap_link)
626 if (rp->ap_resource == res)
627 break;
628 return_PTR(rp);
629}
630
631/*
632 * Find a power consumer's control structure.
633 */
634static struct acpi_powerconsumer *
635acpi_pwr_find_consumer(ACPI_HANDLE consumer)
636{
637 struct acpi_powerconsumer *pc;
638
639 ACPI_FUNCTION_TRACE(__func__);
640
641 TAILQ_FOREACH(pc, &acpi_powerconsumers, ac_link)
642 if (pc->ac_consumer == consumer)
643 break;
644 return_PTR(pc);
645}
646
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 unchanged lines hidden (view full) ---
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 * $FreeBSD: head/sys/dev/acpica/acpi_powerres.c 91125 2002-02-23 05:28:22Z msmith $
27 */
28
29#include "opt_acpi.h" /* XXX trim includes */
30#include <sys/param.h>
31#include <sys/kernel.h>
32#include <sys/proc.h>
33#include <sys/lock.h>
34#include <sys/malloc.h>
--- 35 unchanged lines hidden (view full) ---
70 */
71
72MALLOC_DEFINE(M_ACPIPWR, "acpipwr", "ACPI power resources");
73
74/*
75 * Hooks for the ACPI CA debugging infrastructure
76 */
77#define _COMPONENT ACPI_POWER
78ACPI_MODULE_NAME("POWERRES")
79
80/* return values from _STA on a power resource */
81#define ACPI_PWR_OFF 0
82#define ACPI_PWR_ON 1
83
84/*
85 * A relationship between a power resource and a consumer.
86 */
--- 56 unchanged lines hidden (view full) ---
143static ACPI_STATUS
144acpi_pwr_register_resource(ACPI_HANDLE res)
145{
146 ACPI_STATUS status;
147 ACPI_BUFFER buf;
148 ACPI_OBJECT *obj;
149 struct acpi_powerresource *rp, *srp;
150
151 ACPI_FUNCTION_TRACE(__func__);
152
153 rp = NULL;
154 buf.Pointer = NULL;
155
156 /* look to see if we know about this resource */
157 if (acpi_pwr_find_resource(res) != NULL)
158 return_ACPI_STATUS(AE_OK); /* already know about it */
159
160 /* allocate a new resource */
161 if ((rp = malloc(sizeof(*rp), M_ACPIPWR, M_NOWAIT | M_ZERO)) == NULL) {
162 status = AE_NO_MEMORY;
163 goto out;
164 }
165 TAILQ_INIT(&rp->ap_references);
166 rp->ap_resource = res;
167
168 /* get the Power Resource object */
169 buf.Length = ACPI_ALLOCATE_BUFFER;
170 if (ACPI_FAILURE(status = AcpiEvaluateObject(res, NULL, NULL, &buf))) {
171 ACPI_DEBUG_PRINT((ACPI_DB_OBJECTS, "no power resource object\n"));
172 goto out;
173 }
174 obj = buf.Pointer;
175 if (obj->Type != ACPI_TYPE_POWER) {
176 ACPI_DEBUG_PRINT((ACPI_DB_OBJECTS, "questionable power resource object %s\n", acpi_name(res)));
177 status = AE_TYPE;
178 goto out;
--- 13 unchanged lines hidden (view full) ---
192 TAILQ_INSERT_BEFORE(srp, rp, ap_link);
193 goto done;
194 }
195 TAILQ_INSERT_TAIL(&acpi_powerresources, rp, ap_link);
196
197 done:
198 ACPI_DEBUG_PRINT((ACPI_DB_OBJECTS, "registered power resource %s\n", acpi_name(res)));
199 out:
200 if (buf.Pointer != NULL)
201 AcpiOsFree(buf.Pointer);
202 if (ACPI_FAILURE(status) && (rp != NULL))
203 free(rp, M_ACPIPWR);
204 return_ACPI_STATUS(status);
205}
206
207/*
208 * Deregister a power resource.
209 */
210static ACPI_STATUS
211acpi_pwr_deregister_resource(ACPI_HANDLE res)
212{
213 struct acpi_powerresource *rp;
214
215 ACPI_FUNCTION_TRACE(__func__);
216
217 rp = NULL;
218
219 /* find the resource */
220 if ((rp = acpi_pwr_find_resource(res)) == NULL)
221 return_ACPI_STATUS(AE_BAD_PARAMETER);
222
223 /* check that there are no consumers referencing this resource */
--- 14 unchanged lines hidden (view full) ---
238 *
239 * It's OK to call this if we already know about the consumer.
240 */
241static ACPI_STATUS
242acpi_pwr_register_consumer(ACPI_HANDLE consumer)
243{
244 struct acpi_powerconsumer *pc;
245
246 ACPI_FUNCTION_TRACE(__func__);
247
248 /* check to see whether we know about this consumer already */
249 if ((pc = acpi_pwr_find_consumer(consumer)) != NULL)
250 return_ACPI_STATUS(AE_OK);
251
252 /* allocate a new power consumer */
253 if ((pc = malloc(sizeof(*pc), M_ACPIPWR, M_NOWAIT)) == NULL)
254 return_ACPI_STATUS(AE_NO_MEMORY);
--- 14 unchanged lines hidden (view full) ---
269 * This should only be done once the consumer has been powered off.
270 * (XXX is this correct? Check once implemented)
271 */
272static ACPI_STATUS
273acpi_pwr_deregister_consumer(ACPI_HANDLE consumer)
274{
275 struct acpi_powerconsumer *pc;
276
277 ACPI_FUNCTION_TRACE(__func__);
278
279 /* find the consumer */
280 if ((pc = acpi_pwr_find_consumer(consumer)) == NULL)
281 return_ACPI_STATUS(AE_BAD_PARAMETER);
282
283 /* make sure the consumer's not referencing anything right now */
284 if (TAILQ_FIRST(&pc->ac_references) != NULL)
285 return_ACPI_STATUS(AE_BAD_PARAMETER);
--- 16 unchanged lines hidden (view full) ---
302 struct acpi_powerreference *pr;
303 ACPI_HANDLE method_handle, reslist_handle, pr0_handle;
304 ACPI_BUFFER reslist_buffer;
305 ACPI_OBJECT *reslist_object;
306 ACPI_STATUS status;
307 char *method_name, *reslist_name;
308 int res_changed;
309
310 ACPI_FUNCTION_TRACE(__func__);
311
312 /* find the consumer */
313 if ((pc = acpi_pwr_find_consumer(consumer)) == NULL) {
314 if (ACPI_FAILURE(status = acpi_pwr_register_consumer(consumer)))
315 return_ACPI_STATUS(status);
316 if ((pc = acpi_pwr_find_consumer(consumer)) == NULL) {
317 return_ACPI_STATUS(AE_ERROR); /* something very wrong */
318 }
319 }
320
321 /* check for valid transitions */
322 if ((pc->ac_state == ACPI_STATE_D3) && (state != ACPI_STATE_D0))
--- 28 unchanged lines hidden (view full) ---
351 * reslist must be present. We need to do this before we go
352 * dereferencing resources (since we might be trying to go to
353 * a state we don't support).
354 *
355 * Note that if any states are supported, the device has to
356 * support D0 and D3. It's never an error to try to go to
357 * D0.
358 */
359 reslist_buffer.Pointer = NULL;
360 reslist_object = NULL;
361 if (ACPI_FAILURE(AcpiGetHandle(consumer, method_name, &method_handle)))
362 method_handle = NULL;
363 if (ACPI_FAILURE(AcpiGetHandle(consumer, reslist_name, &reslist_handle)))
364 reslist_handle = NULL;
365 if ((reslist_handle == NULL) && (method_handle == NULL)) {
366 if (state == ACPI_STATE_D0) {
367 pc->ac_state = ACPI_STATE_D0;
368 return_ACPI_STATUS(AE_OK);
369 }
370 if (state != ACPI_STATE_D3) {
371 goto bad;
372 }
373
374 /* turn off the resources listed in _PR0 to go to D3. */
375 if (ACPI_FAILURE(AcpiGetHandle(consumer, "_PR0", &pr0_handle))) {
376 goto bad;
377 }
378 reslist_buffer.Length = ACPI_ALLOCATE_BUFFER;
379 if (ACPI_FAILURE(status = AcpiEvaluateObject(pr0_handle, NULL, NULL, &reslist_buffer))) {
380 goto bad;
381 }
382 reslist_object = (ACPI_OBJECT *)reslist_buffer.Pointer;
383 if ((reslist_object->Type != ACPI_TYPE_PACKAGE) ||
384 (reslist_object->Package.Count == 0)) {
385 goto bad;
386 }
387 AcpiOsFree(reslist_buffer.Pointer);
388 reslist_buffer.Pointer = NULL;
389 reslist_object = NULL;
390 }
391
392 /*
393 * Check that we can actually fetch the list of power resources
394 */
395 if (reslist_handle != NULL) {
396 reslist_buffer.Length = ACPI_ALLOCATE_BUFFER;
397 if (ACPI_FAILURE(status = AcpiEvaluateObject(reslist_handle, NULL, NULL, &reslist_buffer))) {
398 ACPI_DEBUG_PRINT((ACPI_DB_OBJECTS, "can't evaluate resource list %s\n",
399 acpi_name(reslist_handle)));
400 goto out;
401 }
402 reslist_object = (ACPI_OBJECT *)reslist_buffer.Pointer;
403 if (reslist_object->Type != ACPI_TYPE_PACKAGE) {
404 ACPI_DEBUG_PRINT((ACPI_DB_OBJECTS, "resource list is not ACPI_TYPE_PACKAGE (%d)\n",
405 reslist_object->Type));
406 status = AE_TYPE;
407 goto out;
408 }
409 }
410
411 /*
412 * Now we are ready to switch, so kill off any current power resource references.
413 */
414 res_changed = 0;
415 while((pr = TAILQ_FIRST(&pc->ac_references)) != NULL) {
416 res_changed = 1;
--- 14 unchanged lines hidden (view full) ---
431 acpi_ForeachPackageObject(reslist_object, acpi_pwr_reference_resource, pc);
432 res_changed = 1;
433 }
434
435 /*
436 * If we changed anything in the resource list, we need to run a switch
437 * pass now.
438 */
439 if (ACPI_FAILURE(status = acpi_pwr_switch_power())) {
440 ACPI_DEBUG_PRINT((ACPI_DB_OBJECTS, "failed to correctly switch resources to move %s to D%d\n",
441 acpi_name(consumer), state));
442 goto out; /* XXX is this appropriate? Should we return to previous state? */
443 }
444
445 /* invoke power state switch method (if present) */
446 if (method_handle != NULL) {
447 ACPI_DEBUG_PRINT((ACPI_DB_OBJECTS, "invoking state transition method %s\n",
448 acpi_name(method_handle)));
449 if (ACPI_FAILURE(status = AcpiEvaluateObject(method_handle, NULL, NULL, NULL))) {
450 ACPI_DEBUG_PRINT((ACPI_DB_OBJECTS, "failed to set state - %s\n",
451 AcpiFormatException(status)));
452 pc->ac_state = ACPI_STATE_UNKNOWN;
453 goto out; /* XXX Should we return to previous state? */
454 }
455 }
456
457 /* transition was successful */
458 pc->ac_state = state;
459 return_ACPI_STATUS(AE_OK);
460
461 bad:
462 ACPI_DEBUG_PRINT((ACPI_DB_OBJECTS, "attempt to set unsupported state D%d\n",
463 state));
464 status = AE_BAD_PARAMETER;
465
466 out:
467 if (reslist_buffer.Pointer != NULL)
468 AcpiOsFree(reslist_buffer.Pointer);
469 return_ACPI_STATUS(status);
470}
471
472/*
473 * Called to create a reference between a power consumer and a power resource
474 * identified in the object.
475 */
476static void
477acpi_pwr_reference_resource(ACPI_OBJECT *obj, void *arg)
478{
479 struct acpi_powerconsumer *pc = (struct acpi_powerconsumer *)arg;
480 struct acpi_powerreference *pr;
481 struct acpi_powerresource *rp;
482 ACPI_HANDLE res;
483 ACPI_STATUS status;
484
485 ACPI_FUNCTION_TRACE(__func__);
486
487 /* check the object type */
488 if (obj->Type != ACPI_TYPE_STRING) {
489 ACPI_DEBUG_PRINT((ACPI_DB_OBJECTS, "don't know how to create a power reference to object type %d\n",
490 obj->Type));
491 return_VOID;
492 }
493
--- 41 unchanged lines hidden (view full) ---
535 */
536static ACPI_STATUS
537acpi_pwr_switch_power(void)
538{
539 struct acpi_powerresource *rp;
540 ACPI_STATUS status;
541 int cur;
542
543 ACPI_FUNCTION_TRACE(__func__);
544
545 /*
546 * Sweep the list forwards turning things on.
547 */
548 TAILQ_FOREACH(rp, &acpi_powerresources, ap_link) {
549 if (TAILQ_FIRST(&rp->ap_references) == NULL) {
550 ACPI_DEBUG_PRINT((ACPI_DB_OBJECTS, "%s has no references, not turning on\n",
551 acpi_name(rp->ap_resource)));
552 continue;
553 }
554
555 /* we could cache this if we trusted it not to change under us */
556 if (ACPI_FAILURE(status = acpi_EvaluateInteger(rp->ap_resource, "_STA", &cur))) {
557 ACPI_DEBUG_PRINT((ACPI_DB_OBJECTS, "can't get status of %s - %d\n",
558 acpi_name(rp->ap_resource), status));
559 continue; /* XXX is this correct? Always switch if in doubt? */
560 }
561
562 /*
563 * Switch if required. Note that we ignore the result of the switch
564 * effort; we don't know what to do if it fails, so checking wouldn't
--- 17 unchanged lines hidden (view full) ---
582 TAILQ_FOREACH_REVERSE(rp, &acpi_powerresources, acpi_powerresource_list, ap_link) {
583 if (TAILQ_FIRST(&rp->ap_references) != NULL) {
584 ACPI_DEBUG_PRINT((ACPI_DB_OBJECTS, "%s has references, not turning off\n",
585 acpi_name(rp->ap_resource)));
586 continue;
587 }
588
589 /* we could cache this if we trusted it not to change under us */
590 if (ACPI_FAILURE(status = acpi_EvaluateInteger(rp->ap_resource, "_STA", &cur))) {
591 ACPI_DEBUG_PRINT((ACPI_DB_OBJECTS, "can't get status of %s - %d\n",
592 acpi_name(rp->ap_resource), status));
593 continue; /* XXX is this correct? Always switch if in doubt? */
594 }
595
596 /*
597 * Switch if required. Note that we ignore the result of the switch
598 * effort; we don't know what to do if it fails, so checking wouldn't
--- 16 unchanged lines hidden (view full) ---
615/*
616 * Find a power resource's control structure.
617 */
618static struct acpi_powerresource *
619acpi_pwr_find_resource(ACPI_HANDLE res)
620{
621 struct acpi_powerresource *rp;
622
623 ACPI_FUNCTION_TRACE(__func__);
624
625 TAILQ_FOREACH(rp, &acpi_powerresources, ap_link)
626 if (rp->ap_resource == res)
627 break;
628 return_PTR(rp);
629}
630
631/*
632 * Find a power consumer's control structure.
633 */
634static struct acpi_powerconsumer *
635acpi_pwr_find_consumer(ACPI_HANDLE consumer)
636{
637 struct acpi_powerconsumer *pc;
638
639 ACPI_FUNCTION_TRACE(__func__);
640
641 TAILQ_FOREACH(pc, &acpi_powerconsumers, ac_link)
642 if (pc->ac_consumer == consumer)
643 break;
644 return_PTR(pc);
645}
646