| 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 | * $FreeBSD: src/sys/dev/acpica/acpi_powerres.c,v 1.30.8.1 2009/04/15 03:14:26 kensmith Exp $ |
| 27 | */ |
| 28 | |
| 29 | #include "opt_acpi.h" |
| 30 | #include <sys/param.h> |
| 31 | #include <sys/kernel.h> |
| 32 | #include <sys/malloc.h> |
| 33 | #include <sys/bus.h> |
| 34 | |
| 35 | #include "acpi.h" |
| 36 | #include <dev/acpica5/acpivar.h> |
| 37 | |
| 38 | /* |
| 39 | * ACPI power resource management. |
| 40 | * |
| 41 | * Power resource behaviour is slightly complicated by the fact that |
| 42 | * a single power resource may provide power for more than one device. |
| 43 | * Thus, we must track the device(s) being powered by a given power |
| 44 | * resource, and only deactivate it when there are no powered devices. |
| 45 | * |
| 46 | * Note that this only manages resources for known devices. There is an |
| 47 | * ugly case where we may turn of power to a device which is in use because |
| 48 | * we don't know that it depends on a given resource. We should perhaps |
| 49 | * try to be smarter about this, but a more complete solution would involve |
| 50 | * scanning all of the ACPI namespace to find devices we're not currently |
| 51 | * aware of, and this raises questions about whether they should be left |
| 52 | * on, turned off, etc. |
| 53 | */ |
| 54 | |
| 55 | MALLOC_DEFINE(M_ACPIPWR, "acpipwr", "ACPI power resources"); |
| 56 | |
| 57 | /* Hooks for the ACPI CA debugging infrastructure */ |
| 58 | #define _COMPONENT ACPI_POWERRES |
| 59 | ACPI_MODULE_NAME("POWERRES") |
| 60 | |
| 61 | /* Return values from _STA on a power resource */ |
| 62 | #define ACPI_PWR_OFF 0 |
| 63 | #define ACPI_PWR_ON 1 |
| 64 | #define ACPI_PWR_UNK (-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 | ACPI_INTEGER ap_systemlevel; |
| 89 | ACPI_INTEGER ap_order; |
| 90 | int ap_state; |
| 91 | }; |
| 92 | |
| 93 | static TAILQ_HEAD(acpi_powerresource_list, acpi_powerresource) |
| 94 | acpi_powerresources; |
| 95 | static TAILQ_HEAD(acpi_powerconsumer_list, acpi_powerconsumer) |
| 96 | acpi_powerconsumers; |
| 97 | ACPI_SERIAL_DECL(powerres, "ACPI power resources"); |
| 98 | |
| 99 | static ACPI_STATUS acpi_pwr_register_consumer(ACPI_HANDLE consumer); |
| 100 | #ifdef notyet |
| 101 | static ACPI_STATUS acpi_pwr_deregister_consumer(ACPI_HANDLE consumer); |
| 102 | #endif /* notyet */ |
| 103 | static ACPI_STATUS acpi_pwr_register_resource(ACPI_HANDLE res); |
| 104 | #ifdef notyet |
| 105 | static ACPI_STATUS acpi_pwr_deregister_resource(ACPI_HANDLE res); |
| 106 | #endif /* notyet */ |
| 107 | static void acpi_pwr_reference_resource(ACPI_OBJECT *obj, |
| 108 | void *arg); |
| 109 | static int acpi_pwr_dereference_resource(struct acpi_powerconsumer |
| 110 | *pc); |
| 111 | static ACPI_STATUS acpi_pwr_switch_power(void); |
| 112 | static struct acpi_powerresource |
| 113 | *acpi_pwr_find_resource(ACPI_HANDLE res); |
| 114 | static struct acpi_powerconsumer |
| 115 | *acpi_pwr_find_consumer(ACPI_HANDLE consumer); |
| 116 | |
| 117 | /* Initialise our lists. */ |
| 118 | static void |
| 119 | acpi_pwr_init(void *junk) |
| 120 | { |
| 121 | ACPI_SERIAL_INIT(powerres); |
| 122 | TAILQ_INIT(&acpi_powerresources); |
| 123 | TAILQ_INIT(&acpi_powerconsumers); |
| 124 | } |
| 125 | SYSINIT(acpi_powerresource, SI_BOOT1_TUNABLES, SI_ORDER_ANY, acpi_pwr_init, NULL); |
| 126 | |
| 127 | /* |
| 128 | * Register a power resource. |
| 129 | * |
| 130 | * It's OK to call this if we already know about the resource. |
| 131 | */ |
| 132 | static ACPI_STATUS |
| 133 | acpi_pwr_register_resource(ACPI_HANDLE res) |
| 134 | { |
| 135 | ACPI_STATUS status; |
| 136 | ACPI_BUFFER buf; |
| 137 | ACPI_OBJECT *obj; |
| 138 | struct acpi_powerresource *rp, *srp; |
| 139 | |
| 140 | ACPI_FUNCTION_TRACE((char *)(uintptr_t)__func__); |
| 141 | ACPI_SERIAL_ASSERT(powerres); |
| 142 | |
| 143 | rp = NULL; |
| 144 | buf.Pointer = NULL; |
| 145 | |
| 146 | /* Look to see if we know about this resource */ |
| 147 | if (acpi_pwr_find_resource(res) != NULL) |
| 148 | return_ACPI_STATUS (AE_OK); /* already know about it */ |
| 149 | |
| 150 | /* Allocate a new resource */ |
| 151 | if ((rp = kmalloc(sizeof(*rp), M_ACPIPWR, M_NOWAIT | M_ZERO)) == NULL) { |
| 152 | status = AE_NO_MEMORY; |
| 153 | goto out; |
| 154 | } |
| 155 | TAILQ_INIT(&rp->ap_references); |
| 156 | rp->ap_resource = res; |
| 157 | |
| 158 | /* Get the Power Resource object */ |
| 159 | buf.Length = ACPI_ALLOCATE_BUFFER; |
| 160 | if (ACPI_FAILURE(status = AcpiEvaluateObject(res, NULL, NULL, &buf))) { |
| 161 | ACPI_DEBUG_PRINT((ACPI_DB_OBJECTS, "no power resource object\n")); |
| 162 | goto out; |
| 163 | } |
| 164 | obj = buf.Pointer; |
| 165 | if (obj->Type != ACPI_TYPE_POWER) { |
| 166 | ACPI_DEBUG_PRINT((ACPI_DB_OBJECTS, |
| 167 | "questionable power resource object %s\n", |
| 168 | acpi_name(res))); |
| 169 | status = AE_TYPE; |
| 170 | goto out; |
| 171 | } |
| 172 | rp->ap_systemlevel = obj->PowerResource.SystemLevel; |
| 173 | rp->ap_order = obj->PowerResource.ResourceOrder; |
| 174 | rp->ap_state = ACPI_PWR_UNK; |
| 175 | |
| 176 | /* Sort the resource into the list */ |
| 177 | status = AE_OK; |
| 178 | srp = TAILQ_FIRST(&acpi_powerresources); |
| 179 | if (srp == NULL || rp->ap_order < srp->ap_order) { |
| 180 | TAILQ_INSERT_HEAD(&acpi_powerresources, rp, ap_link); |
| 181 | goto done; |
| 182 | } |
| 183 | TAILQ_FOREACH(srp, &acpi_powerresources, ap_link) { |
| 184 | if (rp->ap_order < srp->ap_order) { |
| 185 | TAILQ_INSERT_BEFORE(srp, rp, ap_link); |
| 186 | goto done; |
| 187 | } |
| 188 | } |
| 189 | TAILQ_INSERT_TAIL(&acpi_powerresources, rp, ap_link); |
| 190 | |
| 191 | done: |
| 192 | ACPI_DEBUG_PRINT((ACPI_DB_OBJECTS, |
| 193 | "registered power resource %s\n", acpi_name(res))); |
| 194 | |
| 195 | out: |
| 196 | if (buf.Pointer != NULL) |
| 197 | AcpiOsFree(buf.Pointer); |
| 198 | if (ACPI_FAILURE(status) && rp != NULL) |
| 199 | kfree(rp, M_ACPIPWR); |
| 200 | return_ACPI_STATUS (status); |
| 201 | } |
| 202 | |
| 203 | #ifdef notyet |
| 204 | /* |
| 205 | * Deregister a power resource. |
| 206 | */ |
| 207 | static ACPI_STATUS |
| 208 | acpi_pwr_deregister_resource(ACPI_HANDLE res) |
| 209 | { |
| 210 | struct acpi_powerresource *rp; |
| 211 | |
| 212 | ACPI_FUNCTION_TRACE((char *)(uintptr_t)__func__); |
| 213 | ACPI_SERIAL_ASSERT(powerres); |
| 214 | |
| 215 | rp = NULL; |
| 216 | |
| 217 | /* Find the resource */ |
| 218 | if ((rp = acpi_pwr_find_resource(res)) == NULL) |
| 219 | return_ACPI_STATUS (AE_BAD_PARAMETER); |
| 220 | |
| 221 | /* Check that there are no consumers referencing this resource */ |
| 222 | if (TAILQ_FIRST(&rp->ap_references) != NULL) |
| 223 | return_ACPI_STATUS (AE_BAD_PARAMETER); |
| 224 | |
| 225 | /* Pull it off the list and kfree it */ |
| 226 | TAILQ_REMOVE(&acpi_powerresources, rp, ap_link); |
| 227 | kfree(rp, M_ACPIPWR); |
| 228 | |
| 229 | ACPI_DEBUG_PRINT((ACPI_DB_OBJECTS, "deregistered power resource %s\n", |
| 230 | acpi_name(res))); |
| 231 | |
| 232 | return_ACPI_STATUS (AE_OK); |
| 233 | } |
| 234 | #endif /* notyet */ |
| 235 | |
| 236 | /* |
| 237 | * Register a power consumer. |
| 238 | * |
| 239 | * It's OK to call this if we already know about the consumer. |
| 240 | */ |
| 241 | static ACPI_STATUS |
| 242 | acpi_pwr_register_consumer(ACPI_HANDLE consumer) |
| 243 | { |
| 244 | struct acpi_powerconsumer *pc; |
| 245 | |
| 246 | ACPI_FUNCTION_TRACE((char *)(uintptr_t)__func__); |
| 247 | ACPI_SERIAL_ASSERT(powerres); |
| 248 | |
| 249 | /* Check to see whether we know about this consumer already */ |
| 250 | if (acpi_pwr_find_consumer(consumer) != NULL) |
| 251 | return_ACPI_STATUS (AE_OK); |
| 252 | |
| 253 | /* Allocate a new power consumer */ |
| 254 | if ((pc = kmalloc(sizeof(*pc), M_ACPIPWR, M_NOWAIT)) == NULL) |
| 255 | return_ACPI_STATUS (AE_NO_MEMORY); |
| 256 | TAILQ_INSERT_HEAD(&acpi_powerconsumers, pc, ac_link); |
| 257 | TAILQ_INIT(&pc->ac_references); |
| 258 | pc->ac_consumer = consumer; |
| 259 | |
| 260 | /* XXX we should try to find its current state */ |
| 261 | pc->ac_state = ACPI_STATE_UNKNOWN; |
| 262 | |
| 263 | ACPI_DEBUG_PRINT((ACPI_DB_OBJECTS, "registered power consumer %s\n", |
| 264 | acpi_name(consumer))); |
| 265 | |
| 266 | return_ACPI_STATUS (AE_OK); |
| 267 | } |
| 268 | |
| 269 | #ifdef notyet |
| 270 | /* |
| 271 | * Deregister a power consumer. |
| 272 | * |
| 273 | * This should only be done once the consumer has been powered off. |
| 274 | * (XXX is this correct? Check once implemented) |
| 275 | */ |
| 276 | static ACPI_STATUS |
| 277 | acpi_pwr_deregister_consumer(ACPI_HANDLE consumer) |
| 278 | { |
| 279 | struct acpi_powerconsumer *pc; |
| 280 | |
| 281 | ACPI_FUNCTION_TRACE((char *)(uintptr_t)__func__); |
| 282 | ACPI_SERIAL_ASSERT(powerres); |
| 283 | |
| 284 | /* Find the consumer */ |
| 285 | if ((pc = acpi_pwr_find_consumer(consumer)) == NULL) |
| 286 | return_ACPI_STATUS (AE_BAD_PARAMETER); |
| 287 | |
| 288 | /* Make sure the consumer's not referencing anything right now */ |
| 289 | if (TAILQ_FIRST(&pc->ac_references) != NULL) |
| 290 | return_ACPI_STATUS (AE_BAD_PARAMETER); |
| 291 | |
| 292 | /* Pull the consumer off the list and kfree it */ |
| 293 | TAILQ_REMOVE(&acpi_powerconsumers, pc, ac_link); |
| 294 | kfree(pc, M_ACPIPWR); |
| 295 | |
| 296 | ACPI_DEBUG_PRINT((ACPI_DB_OBJECTS, "deregistered power consumer %s\n", |
| 297 | acpi_name(consumer))); |
| 298 | |
| 299 | return_ACPI_STATUS (AE_OK); |
| 300 | } |
| 301 | #endif /* notyet */ |
| 302 | |
| 303 | /* |
| 304 | * Set a power consumer to a particular power state. |
| 305 | */ |
| 306 | ACPI_STATUS |
| 307 | acpi_pwr_switch_consumer(ACPI_HANDLE consumer, int state) |
| 308 | { |
| 309 | struct acpi_powerconsumer *pc; |
| 310 | ACPI_HANDLE method_handle, reslist_handle, pr0_handle; |
| 311 | ACPI_BUFFER reslist_buffer; |
| 312 | ACPI_OBJECT *reslist_object; |
| 313 | ACPI_STATUS status; |
| 314 | char *method_name, *reslist_name; |
| 315 | int res_changed; |
| 316 | |
| 317 | ACPI_FUNCTION_TRACE((char *)(uintptr_t)__func__); |
| 318 | |
| 319 | /* It's never ok to switch a non-existent consumer. */ |
| 320 | if (consumer == NULL) |
| 321 | return_ACPI_STATUS (AE_NOT_FOUND); |
| 322 | reslist_buffer.Pointer = NULL; |
| 323 | reslist_object = NULL; |
| 324 | ACPI_SERIAL_BEGIN(powerres); |
| 325 | |
| 326 | /* Find the consumer */ |
| 327 | if ((pc = acpi_pwr_find_consumer(consumer)) == NULL) { |
| 328 | if (ACPI_FAILURE(status = acpi_pwr_register_consumer(consumer))) |
| 329 | goto out; |
| 330 | if ((pc = acpi_pwr_find_consumer(consumer)) == NULL) |
| 331 | panic("acpi added power consumer but can't find it"); |
| 332 | } |
| 333 | |
| 334 | /* Check for valid transitions. We can only go to D0 from D3. */ |
| 335 | status = AE_BAD_PARAMETER; |
| 336 | if (pc->ac_state == ACPI_STATE_D3 && state != ACPI_STATE_D0) |
| 337 | goto out; |
| 338 | |
| 339 | /* Find transition mechanism(s) */ |
| 340 | switch (state) { |
| 341 | case ACPI_STATE_D0: |
| 342 | method_name = "_PS0"; |
| 343 | reslist_name = "_PR0"; |
| 344 | break; |
| 345 | case ACPI_STATE_D1: |
| 346 | method_name = "_PS1"; |
| 347 | reslist_name = "_PR1"; |
| 348 | break; |
| 349 | case ACPI_STATE_D2: |
| 350 | method_name = "_PS2"; |
| 351 | reslist_name = "_PR2"; |
| 352 | break; |
| 353 | case ACPI_STATE_D3: |
| 354 | method_name = "_PS3"; |
| 355 | reslist_name = "_PR3"; |
| 356 | break; |
| 357 | default: |
| 358 | goto out; |
| 359 | } |
| 360 | ACPI_DEBUG_PRINT((ACPI_DB_OBJECTS, "setup to switch %s D%d -> D%d\n", |
| 361 | acpi_name(consumer), pc->ac_state, state)); |
| 362 | |
| 363 | /* |
| 364 | * Verify that this state is supported, ie. one of method or |
| 365 | * reslist must be present. We need to do this before we go |
| 366 | * dereferencing resources (since we might be trying to go to |
| 367 | * a state we don't support). |
| 368 | * |
| 369 | * Note that if any states are supported, the device has to |
| 370 | * support D0 and D3. It's never an error to try to go to |
| 371 | * D0. |
| 372 | */ |
| 373 | if (ACPI_FAILURE(AcpiGetHandle(consumer, method_name, &method_handle))) |
| 374 | method_handle = NULL; |
| 375 | if (ACPI_FAILURE(AcpiGetHandle(consumer, reslist_name, &reslist_handle))) |
| 376 | reslist_handle = NULL; |
| 377 | if (reslist_handle == NULL && method_handle == NULL) { |
| 378 | if (state == ACPI_STATE_D0) { |
| 379 | pc->ac_state = ACPI_STATE_D0; |
| 380 | status = AE_OK; |
| 381 | goto out; |
| 382 | } |
| 383 | if (state != ACPI_STATE_D3) { |
| 384 | ACPI_DEBUG_PRINT((ACPI_DB_OBJECTS, |
| 385 | "attempt to set unsupported state D%d\n", state)); |
| 386 | goto out; |
| 387 | } |
| 388 | |
| 389 | /* |
| 390 | * Turn off the resources listed in _PR0 to go to D3. If there is |
| 391 | * no _PR0 method, this object doesn't support ACPI power states. |
| 392 | */ |
| 393 | if (ACPI_FAILURE(AcpiGetHandle(consumer, "_PR0", &pr0_handle))) { |
| 394 | status = AE_NOT_FOUND; |
| 395 | ACPI_DEBUG_PRINT((ACPI_DB_OBJECTS, |
| 396 | "device missing _PR0 (desired state was D%d)\n", state)); |
| 397 | goto out; |
| 398 | } |
| 399 | reslist_buffer.Length = ACPI_ALLOCATE_BUFFER; |
| 400 | status = AcpiEvaluateObject(pr0_handle, NULL, NULL, &reslist_buffer); |
| 401 | if (ACPI_FAILURE(status)) { |
| 402 | ACPI_DEBUG_PRINT((ACPI_DB_OBJECTS, |
| 403 | "can't evaluate _PR0 for device %s, state D%d\n", |
| 404 | acpi_name(consumer), state)); |
| 405 | goto out; |
| 406 | } |
| 407 | reslist_object = (ACPI_OBJECT *)reslist_buffer.Pointer; |
| 408 | if (!ACPI_PKG_VALID(reslist_object, 1)) { |
| 409 | ACPI_DEBUG_PRINT((ACPI_DB_OBJECTS, |
| 410 | "invalid package object for state D%d\n", state)); |
| 411 | status = AE_TYPE; |
| 412 | goto out; |
| 413 | } |
| 414 | AcpiOsFree(reslist_buffer.Pointer); |
| 415 | reslist_buffer.Pointer = NULL; |
| 416 | reslist_object = NULL; |
| 417 | } |
| 418 | |
| 419 | /* |
| 420 | * Check that we can actually fetch the list of power resources |
| 421 | */ |
| 422 | if (reslist_handle != NULL) { |
| 423 | reslist_buffer.Length = ACPI_ALLOCATE_BUFFER; |
| 424 | status = AcpiEvaluateObject(reslist_handle, NULL, NULL, |
| 425 | &reslist_buffer); |
| 426 | if (ACPI_FAILURE(status)) { |
| 427 | ACPI_DEBUG_PRINT((ACPI_DB_OBJECTS, |
| 428 | "can't evaluate resource list %s\n", |
| 429 | acpi_name(reslist_handle))); |
| 430 | goto out; |
| 431 | } |
| 432 | reslist_object = (ACPI_OBJECT *)reslist_buffer.Pointer; |
| 433 | if (reslist_object->Type != ACPI_TYPE_PACKAGE) { |
| 434 | ACPI_DEBUG_PRINT((ACPI_DB_OBJECTS, |
| 435 | "resource list is not ACPI_TYPE_PACKAGE (%d)\n", |
| 436 | reslist_object->Type)); |
| 437 | status = AE_TYPE; |
| 438 | goto out; |
| 439 | } |
| 440 | } |
| 441 | |
| 442 | /* |
| 443 | * Now we are ready to switch, so kill off any current power |
| 444 | * resource references. |
| 445 | */ |
| 446 | res_changed = acpi_pwr_dereference_resource(pc); |
| 447 | |
| 448 | /* |
| 449 | * Add new power resource references, if we have any. Traverse the |
| 450 | * package that we got from evaluating reslist_handle, and look up each |
| 451 | * of the resources that are referenced. |
| 452 | */ |
| 453 | if (reslist_object != NULL) { |
| 454 | ACPI_DEBUG_PRINT((ACPI_DB_OBJECTS, "referencing %d new resources\n", |
| 455 | reslist_object->Package.Count)); |
| 456 | acpi_ForeachPackageObject(reslist_object, acpi_pwr_reference_resource, |
| 457 | pc); |
| 458 | res_changed = 1; |
| 459 | } |
| 460 | |
| 461 | /* |
| 462 | * If we changed anything in the resource list, we need to run a switch |
| 463 | * pass now. |
| 464 | */ |
| 465 | if (ACPI_FAILURE(status = acpi_pwr_switch_power())) { |
| 466 | ACPI_DEBUG_PRINT((ACPI_DB_OBJECTS, |
| 467 | "failed to switch resources from %s to D%d\n", |
| 468 | acpi_name(consumer), state)); |
| 469 | |
| 470 | /* XXX is this appropriate? Should we return to previous state? */ |
| 471 | goto out; |
| 472 | } |
| 473 | |
| 474 | /* Invoke power state switch method (if present) */ |
| 475 | if (method_handle != NULL) { |
| 476 | ACPI_DEBUG_PRINT((ACPI_DB_OBJECTS, |
| 477 | "invoking state transition method %s\n", |
| 478 | acpi_name(method_handle))); |
| 479 | status = AcpiEvaluateObject(method_handle, NULL, NULL, NULL); |
| 480 | if (ACPI_FAILURE(status)) { |
| 481 | ACPI_DEBUG_PRINT((ACPI_DB_OBJECTS, "failed to set state - %s\n", |
| 482 | AcpiFormatException(status))); |
| 483 | pc->ac_state = ACPI_STATE_UNKNOWN; |
| 484 | |
| 485 | /* XXX Should we return to previous state? */ |
| 486 | goto out; |
| 487 | } |
| 488 | } |
| 489 | |
| 490 | /* Transition was successful */ |
| 491 | pc->ac_state = state; |
| 492 | status = AE_OK; |
| 493 | |
| 494 | out: |
| 495 | ACPI_SERIAL_END(powerres); |
| 496 | if (reslist_buffer.Pointer != NULL) |
| 497 | AcpiOsFree(reslist_buffer.Pointer); |
| 498 | return_ACPI_STATUS (status); |
| 499 | } |
| 500 | |
| 501 | /* Enable or disable a power resource for wake */ |
| 502 | ACPI_STATUS |
| 503 | acpi_pwr_wake_enable(ACPI_HANDLE consumer, int enable) |
| 504 | { |
| 505 | ACPI_STATUS status; |
| 506 | struct acpi_powerconsumer *pc; |
| 507 | struct acpi_prw_data prw; |
| 508 | int i; |
| 509 | |
| 510 | ACPI_FUNCTION_TRACE((char *)(uintptr_t)__func__); |
| 511 | |
| 512 | if (consumer == NULL) |
| 513 | return (AE_BAD_PARAMETER); |
| 514 | |
| 515 | ACPI_SERIAL_BEGIN(powerres); |
| 516 | if ((pc = acpi_pwr_find_consumer(consumer)) == NULL) { |
| 517 | if (ACPI_FAILURE(status = acpi_pwr_register_consumer(consumer))) |
| 518 | goto out; |
| 519 | if ((pc = acpi_pwr_find_consumer(consumer)) == NULL) |
| 520 | panic("acpi wake added power consumer but can't find it"); |
| 521 | } |
| 522 | |
| 523 | status = AE_OK; |
| 524 | if (acpi_parse_prw(consumer, &prw) != 0) |
| 525 | goto out; |
| 526 | for (i = 0; i < prw.power_res_count; i++) |
| 527 | if (enable) |
| 528 | acpi_pwr_reference_resource(&prw.power_res[i], pc); |
| 529 | else |
| 530 | acpi_pwr_dereference_resource(pc); |
| 531 | |
| 532 | if (prw.power_res_count > 0) |
| 533 | acpi_pwr_switch_power(); |
| 534 | |
| 535 | out: |
| 536 | ACPI_SERIAL_END(powerres); |
| 537 | return (status); |
| 538 | } |
| 539 | |
| 540 | /* |
| 541 | * Called to create a reference between a power consumer and a power resource |
| 542 | * identified in the object. |
| 543 | */ |
| 544 | static void |
| 545 | acpi_pwr_reference_resource(ACPI_OBJECT *obj, void *arg) |
| 546 | { |
| 547 | struct acpi_powerconsumer *pc = (struct acpi_powerconsumer *)arg; |
| 548 | struct acpi_powerreference *pr; |
| 549 | struct acpi_powerresource *rp; |
| 550 | ACPI_HANDLE res; |
| 551 | ACPI_STATUS status; |
| 552 | |
| 553 | ACPI_FUNCTION_TRACE((char *)(uintptr_t)__func__); |
| 554 | ACPI_SERIAL_ASSERT(powerres); |
| 555 | |
| 556 | res = acpi_GetReference(NULL, obj); |
| 557 | if (res == NULL) { |
| 558 | ACPI_DEBUG_PRINT((ACPI_DB_OBJECTS, |
| 559 | "can't create a power reference for object type %d\n", |
| 560 | obj->Type)); |
| 561 | return_VOID; |
| 562 | } |
| 563 | |
| 564 | /* Create/look up the resource */ |
| 565 | if (ACPI_FAILURE(status = acpi_pwr_register_resource(res))) { |
| 566 | ACPI_DEBUG_PRINT((ACPI_DB_OBJECTS, |
| 567 | "couldn't register power resource %s - %s\n", |
| 568 | obj->String.Pointer, AcpiFormatException(status))); |
| 569 | return_VOID; |
| 570 | } |
| 571 | if ((rp = acpi_pwr_find_resource(res)) == NULL) { |
| 572 | ACPI_DEBUG_PRINT((ACPI_DB_OBJECTS, "power resource list corrupted\n")); |
| 573 | return_VOID; |
| 574 | } |
| 575 | ACPI_DEBUG_PRINT((ACPI_DB_OBJECTS, "found power resource %s\n", |
| 576 | acpi_name(rp->ap_resource))); |
| 577 | |
| 578 | /* Create a reference between the consumer and resource */ |
| 579 | if ((pr = kmalloc(sizeof(*pr), M_ACPIPWR, M_NOWAIT | M_ZERO)) == NULL) { |
| 580 | ACPI_DEBUG_PRINT((ACPI_DB_OBJECTS, |
| 581 | "allocation failed for a power consumer reference\n")); |
| 582 | return_VOID; |
| 583 | } |
| 584 | pr->ar_consumer = pc; |
| 585 | pr->ar_resource = rp; |
| 586 | TAILQ_INSERT_TAIL(&pc->ac_references, pr, ar_clink); |
| 587 | TAILQ_INSERT_TAIL(&rp->ap_references, pr, ar_rlink); |
| 588 | |
| 589 | return_VOID; |
| 590 | } |
| 591 | |
| 592 | static int |
| 593 | acpi_pwr_dereference_resource(struct acpi_powerconsumer *pc) |
| 594 | { |
| 595 | struct acpi_powerreference *pr; |
| 596 | int changed; |
| 597 | |
| 598 | ACPI_FUNCTION_TRACE((char *)(uintptr_t)__func__); |
| 599 | ACPI_SERIAL_ASSERT(powerres); |
| 600 | |
| 601 | changed = 0; |
| 602 | while ((pr = TAILQ_FIRST(&pc->ac_references)) != NULL) { |
| 603 | ACPI_DEBUG_PRINT((ACPI_DB_OBJECTS, "removing reference to %s\n", |
| 604 | acpi_name(pr->ar_resource->ap_resource))); |
| 605 | TAILQ_REMOVE(&pr->ar_resource->ap_references, pr, ar_rlink); |
| 606 | TAILQ_REMOVE(&pc->ac_references, pr, ar_clink); |
| 607 | kfree(pr, M_ACPIPWR); |
| 608 | changed = 1; |
| 609 | } |
| 610 | |
| 611 | return (changed); |
| 612 | } |
| 613 | |
| 614 | /* |
| 615 | * Switch power resources to conform to the desired state. |
| 616 | * |
| 617 | * Consumers may have modified the power resource list in an arbitrary |
| 618 | * fashion; we sweep it in sequence order. |
| 619 | */ |
| 620 | static ACPI_STATUS |
| 621 | acpi_pwr_switch_power(void) |
| 622 | { |
| 623 | struct acpi_powerresource *rp; |
| 624 | ACPI_STATUS status; |
| 625 | int cur; |
| 626 | |
| 627 | ACPI_FUNCTION_TRACE((char *)(uintptr_t)__func__); |
| 628 | ACPI_SERIAL_ASSERT(powerres); |
| 629 | |
| 630 | /* |
| 631 | * Sweep the list forwards turning things on. |
| 632 | */ |
| 633 | TAILQ_FOREACH(rp, &acpi_powerresources, ap_link) { |
| 634 | if (TAILQ_FIRST(&rp->ap_references) == NULL) { |
| 635 | ACPI_DEBUG_PRINT((ACPI_DB_OBJECTS, |
| 636 | "%s has no references, not turning on\n", |
| 637 | acpi_name(rp->ap_resource))); |
| 638 | continue; |
| 639 | } |
| 640 | |
| 641 | /* We could cache this if we trusted it not to change under us */ |
| 642 | status = acpi_GetInteger(rp->ap_resource, "_STA", &cur); |
| 643 | if (ACPI_FAILURE(status)) { |
| 644 | ACPI_DEBUG_PRINT((ACPI_DB_OBJECTS, "can't get status of %s - %d\n", |
| 645 | acpi_name(rp->ap_resource), status)); |
| 646 | /* XXX is this correct? Always switch if in doubt? */ |
| 647 | continue; |
| 648 | } else if (rp->ap_state == ACPI_PWR_UNK) |
| 649 | rp->ap_state = cur; |
| 650 | |
| 651 | /* |
| 652 | * Switch if required. Note that we ignore the result of the switch |
| 653 | * effort; we don't know what to do if it fails, so checking wouldn't |
| 654 | * help much. |
| 655 | */ |
| 656 | if (rp->ap_state != ACPI_PWR_ON) { |
| 657 | status = AcpiEvaluateObject(rp->ap_resource, "_ON", NULL, NULL); |
| 658 | if (ACPI_FAILURE(status)) { |
| 659 | ACPI_DEBUG_PRINT((ACPI_DB_OBJECTS, |
| 660 | "failed to switch %s on - %s\n", |
| 661 | acpi_name(rp->ap_resource), |
| 662 | AcpiFormatException(status))); |
| 663 | } else { |
| 664 | rp->ap_state = ACPI_PWR_ON; |
| 665 | ACPI_DEBUG_PRINT((ACPI_DB_OBJECTS, "switched %s on\n", |
| 666 | acpi_name(rp->ap_resource))); |
| 667 | } |
| 668 | } else { |
| 669 | ACPI_DEBUG_PRINT((ACPI_DB_OBJECTS, "%s is already on\n", |
| 670 | acpi_name(rp->ap_resource))); |
| 671 | } |
| 672 | } |
| 673 | |
| 674 | /* Sweep the list backwards turning things off. */ |
| 675 | TAILQ_FOREACH_REVERSE(rp, &acpi_powerresources, acpi_powerresource_list, |
| 676 | ap_link) { |
| 677 | |
| 678 | if (TAILQ_FIRST(&rp->ap_references) != NULL) { |
| 679 | ACPI_DEBUG_PRINT((ACPI_DB_OBJECTS, |
| 680 | "%s has references, not turning off\n", |
| 681 | acpi_name(rp->ap_resource))); |
| 682 | continue; |
| 683 | } |
| 684 | |
| 685 | /* We could cache this if we trusted it not to change under us */ |
| 686 | status = acpi_GetInteger(rp->ap_resource, "_STA", &cur); |
| 687 | if (ACPI_FAILURE(status)) { |
| 688 | ACPI_DEBUG_PRINT((ACPI_DB_OBJECTS, "can't get status of %s - %d\n", |
| 689 | acpi_name(rp->ap_resource), status)); |
| 690 | /* XXX is this correct? Always switch if in doubt? */ |
| 691 | continue; |
| 692 | } else if (rp->ap_state == ACPI_PWR_UNK) |
| 693 | rp->ap_state = cur; |
| 694 | |
| 695 | /* |
| 696 | * Switch if required. Note that we ignore the result of the switch |
| 697 | * effort; we don't know what to do if it fails, so checking wouldn't |
| 698 | * help much. |
| 699 | */ |
| 700 | if (rp->ap_state != ACPI_PWR_OFF) { |
| 701 | status = AcpiEvaluateObject(rp->ap_resource, "_OFF", NULL, NULL); |
| 702 | if (ACPI_FAILURE(status)) { |
| 703 | ACPI_DEBUG_PRINT((ACPI_DB_OBJECTS, |
| 704 | "failed to switch %s off - %s\n", |
| 705 | acpi_name(rp->ap_resource), |
| 706 | AcpiFormatException(status))); |
| 707 | } else { |
| 708 | rp->ap_state = ACPI_PWR_OFF; |
| 709 | ACPI_DEBUG_PRINT((ACPI_DB_OBJECTS, "switched %s off\n", |
| 710 | acpi_name(rp->ap_resource))); |
| 711 | } |
| 712 | } else { |
| 713 | ACPI_DEBUG_PRINT((ACPI_DB_OBJECTS, "%s is already off\n", |
| 714 | acpi_name(rp->ap_resource))); |
| 715 | } |
| 716 | } |
| 717 | |
| 718 | return_ACPI_STATUS (AE_OK); |
| 719 | } |
| 720 | |
| 721 | /* |
| 722 | * Find a power resource's control structure. |
| 723 | */ |
| 724 | static struct acpi_powerresource * |
| 725 | acpi_pwr_find_resource(ACPI_HANDLE res) |
| 726 | { |
| 727 | struct acpi_powerresource *rp; |
| 728 | |
| 729 | ACPI_FUNCTION_TRACE((char *)(uintptr_t)__func__); |
| 730 | ACPI_SERIAL_ASSERT(powerres); |
| 731 | |
| 732 | TAILQ_FOREACH(rp, &acpi_powerresources, ap_link) { |
| 733 | if (rp->ap_resource == res) |
| 734 | break; |
| 735 | } |
| 736 | |
| 737 | return_PTR (rp); |
| 738 | } |
| 739 | |
| 740 | /* |
| 741 | * Find a power consumer's control structure. |
| 742 | */ |
| 743 | static struct acpi_powerconsumer * |
| 744 | acpi_pwr_find_consumer(ACPI_HANDLE consumer) |
| 745 | { |
| 746 | struct acpi_powerconsumer *pc; |
| 747 | |
| 748 | ACPI_FUNCTION_TRACE((char *)(uintptr_t)__func__); |
| 749 | ACPI_SERIAL_ASSERT(powerres); |
| 750 | |
| 751 | TAILQ_FOREACH(pc, &acpi_powerconsumers, ac_link) { |
| 752 | if (pc->ac_consumer == consumer) |
| 753 | break; |
| 754 | } |
| 755 | |
| 756 | return_PTR (pc); |
| 757 | } |