| 1 | /* $NetBSD: acpi_power.c,v 1.34 2014/02/25 18:30:09 pooka Exp $ */ |
| 2 | |
| 3 | /*- |
| 4 | * Copyright (c) 2009, 2010, 2011 The NetBSD Foundation, Inc. |
| 5 | * All rights reserved. |
| 6 | * |
| 7 | * This code is derived from software contributed to The NetBSD Foundation |
| 8 | * by Jukka Ruohonen. |
| 9 | * |
| 10 | * Redistribution and use in source and binary forms, with or without |
| 11 | * modification, are permitted provided that the following conditions |
| 12 | * are met: |
| 13 | * 1. Redistributions of source code must retain the above copyright |
| 14 | * notice, this list of conditions and the following disclaimer. |
| 15 | * 2. Redistributions in binary form must reproduce the above copyright |
| 16 | * notice, this list of conditions and the following disclaimer in the |
| 17 | * documentation and/or other materials provided with the distribution. |
| 18 | * |
| 19 | * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS |
| 20 | * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED |
| 21 | * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR |
| 22 | * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS |
| 23 | * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR |
| 24 | * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF |
| 25 | * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS |
| 26 | * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN |
| 27 | * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) |
| 28 | * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE |
| 29 | * POSSIBILITY OF SUCH DAMAGE. |
| 30 | */ |
| 31 | |
| 32 | /*- |
| 33 | * Copyright (c) 2001 Michael Smith |
| 34 | * All rights reserved. |
| 35 | * |
| 36 | * Redistribution and use in source and binary forms, with or without |
| 37 | * modification, are permitted provided that the following conditions |
| 38 | * are met: |
| 39 | * 1. Redistributions of source code must retain the above copyright |
| 40 | * notice, this list of conditions and the following disclaimer. |
| 41 | * 2. Redistributions in binary form must reproduce the above copyright |
| 42 | * notice, this list of conditions and the following disclaimer in the |
| 43 | * documentation and/or other materials provided with the distribution. |
| 44 | * |
| 45 | * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND |
| 46 | * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
| 47 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE |
| 48 | * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE |
| 49 | * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL |
| 50 | * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS |
| 51 | * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) |
| 52 | * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT |
| 53 | * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY |
| 54 | * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF |
| 55 | * SUCH DAMAGE. |
| 56 | */ |
| 57 | |
| 58 | #include <sys/cdefs.h> |
| 59 | __KERNEL_RCSID(0, "$NetBSD: acpi_power.c,v 1.34 2014/02/25 18:30:09 pooka Exp $" ); |
| 60 | |
| 61 | #include <sys/param.h> |
| 62 | #include <sys/kmem.h> |
| 63 | #include <sys/mutex.h> |
| 64 | #include <sys/sysctl.h> |
| 65 | |
| 66 | #include <dev/acpi/acpireg.h> |
| 67 | #include <dev/acpi/acpivar.h> |
| 68 | #include <dev/acpi/acpi_pci.h> |
| 69 | #include <dev/acpi/acpi_power.h> |
| 70 | |
| 71 | #define _COMPONENT ACPI_BUS_COMPONENT |
| 72 | ACPI_MODULE_NAME ("acpi_power" ) |
| 73 | |
| 74 | #define ACPI_STA_POW_OFF 0x00 |
| 75 | #define ACPI_STA_POW_ON 0x01 |
| 76 | |
| 77 | struct acpi_power_res { |
| 78 | ACPI_HANDLE res_handle; |
| 79 | ACPI_INTEGER res_level; |
| 80 | ACPI_INTEGER res_order; |
| 81 | ACPI_HANDLE res_ref[5]; |
| 82 | char res_name[5]; |
| 83 | kmutex_t res_mutex; |
| 84 | |
| 85 | TAILQ_ENTRY(acpi_power_res) res_list; |
| 86 | }; |
| 87 | |
| 88 | static TAILQ_HEAD(, acpi_power_res) res_head = |
| 89 | TAILQ_HEAD_INITIALIZER(res_head); |
| 90 | |
| 91 | static int32_t acpi_power_acpinode = CTL_EOL; |
| 92 | static int32_t acpi_power_powernode = CTL_EOL; |
| 93 | |
| 94 | static struct acpi_power_res *acpi_power_res_init(ACPI_HANDLE); |
| 95 | static struct acpi_power_res *acpi_power_res_get(ACPI_HANDLE); |
| 96 | |
| 97 | static ACPI_STATUS acpi_power_get_direct(struct acpi_devnode *); |
| 98 | static ACPI_STATUS acpi_power_get_indirect(struct acpi_devnode *); |
| 99 | static ACPI_STATUS acpi_power_switch(struct acpi_devnode *, |
| 100 | int, bool); |
| 101 | static ACPI_STATUS acpi_power_res_ref(struct acpi_power_res *, |
| 102 | ACPI_HANDLE); |
| 103 | static ACPI_STATUS acpi_power_res_deref(struct acpi_power_res *, |
| 104 | ACPI_HANDLE); |
| 105 | static ACPI_STATUS acpi_power_res_sta(ACPI_OBJECT *, void *); |
| 106 | |
| 107 | static ACPI_OBJECT *acpi_power_pkg_get(ACPI_HANDLE, int); |
| 108 | static int acpi_power_sysctl(SYSCTLFN_PROTO); |
| 109 | static const char *acpi_xname(ACPI_HANDLE); |
| 110 | |
| 111 | static struct acpi_power_res * |
| 112 | acpi_power_res_init(ACPI_HANDLE hdl) |
| 113 | { |
| 114 | struct acpi_power_res *tmp = NULL; |
| 115 | struct acpi_power_res *res = NULL; |
| 116 | ACPI_OBJECT *obj; |
| 117 | ACPI_BUFFER buf; |
| 118 | ACPI_STATUS rv; |
| 119 | size_t i; |
| 120 | |
| 121 | rv = acpi_eval_struct(hdl, NULL, &buf); |
| 122 | |
| 123 | if (ACPI_FAILURE(rv)) |
| 124 | goto out; |
| 125 | |
| 126 | obj = buf.Pointer; |
| 127 | |
| 128 | if (obj->Type != ACPI_TYPE_POWER) { |
| 129 | rv = AE_TYPE; |
| 130 | goto out; |
| 131 | } |
| 132 | |
| 133 | res = kmem_zalloc(sizeof(*res), KM_SLEEP); |
| 134 | |
| 135 | if (res == NULL) { |
| 136 | rv = AE_NO_MEMORY; |
| 137 | goto out; |
| 138 | } |
| 139 | |
| 140 | res->res_handle = hdl; |
| 141 | res->res_level = obj->PowerResource.SystemLevel; |
| 142 | res->res_order = obj->PowerResource.ResourceOrder; |
| 143 | |
| 144 | (void)strlcpy(res->res_name, |
| 145 | acpi_xname(hdl), sizeof(res->res_name)); |
| 146 | |
| 147 | for (i = 0; i < __arraycount(res->res_ref); i++) |
| 148 | res->res_ref[i] = NULL; |
| 149 | |
| 150 | mutex_init(&res->res_mutex, MUTEX_DEFAULT, IPL_NONE); |
| 151 | |
| 152 | /* |
| 153 | * Power resources should be ordered. |
| 154 | * |
| 155 | * These *should* be enabled from low values to high |
| 156 | * values and disabled from high values to low values. |
| 157 | */ |
| 158 | TAILQ_FOREACH(tmp, &res_head, res_list) { |
| 159 | |
| 160 | if (res->res_order < tmp->res_order) { |
| 161 | TAILQ_INSERT_BEFORE(tmp, res, res_list); |
| 162 | break; |
| 163 | } |
| 164 | } |
| 165 | |
| 166 | if (tmp == NULL) |
| 167 | TAILQ_INSERT_TAIL(&res_head, res, res_list); |
| 168 | |
| 169 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, "%s added to the " |
| 170 | "power resource queue\n" , res->res_name)); |
| 171 | |
| 172 | out: |
| 173 | if (buf.Pointer != NULL) |
| 174 | ACPI_FREE(buf.Pointer); |
| 175 | |
| 176 | return res; |
| 177 | } |
| 178 | |
| 179 | static struct acpi_power_res * |
| 180 | acpi_power_res_get(ACPI_HANDLE hdl) |
| 181 | { |
| 182 | struct acpi_power_res *res; |
| 183 | |
| 184 | TAILQ_FOREACH(res, &res_head, res_list) { |
| 185 | |
| 186 | if (res->res_handle == hdl) |
| 187 | return res; |
| 188 | } |
| 189 | |
| 190 | return acpi_power_res_init(hdl); |
| 191 | } |
| 192 | |
| 193 | bool |
| 194 | acpi_power_register(ACPI_HANDLE hdl) |
| 195 | { |
| 196 | return true; |
| 197 | } |
| 198 | |
| 199 | void |
| 200 | acpi_power_deregister(ACPI_HANDLE hdl) |
| 201 | { |
| 202 | struct acpi_devnode *ad = acpi_match_node(hdl); |
| 203 | struct acpi_power_res *res; |
| 204 | |
| 205 | if (ad == NULL) |
| 206 | return; |
| 207 | |
| 208 | /* |
| 209 | * Remove all references in each resource. |
| 210 | */ |
| 211 | TAILQ_FOREACH(res, &res_head, res_list) |
| 212 | (void)acpi_power_res_deref(res, ad->ad_handle); |
| 213 | } |
| 214 | |
| 215 | /* |
| 216 | * Get the D-state of an ACPI device node. |
| 217 | */ |
| 218 | bool |
| 219 | acpi_power_get(ACPI_HANDLE hdl, int *state) |
| 220 | { |
| 221 | struct acpi_devnode *ad = acpi_match_node(hdl); |
| 222 | ACPI_STATUS rv; |
| 223 | |
| 224 | if (ad == NULL) |
| 225 | return false; |
| 226 | |
| 227 | /* |
| 228 | * As _PSC may be broken, first try to |
| 229 | * retrieve the power state indirectly |
| 230 | * via power resources. |
| 231 | */ |
| 232 | rv = acpi_power_get_indirect(ad); |
| 233 | |
| 234 | if (ACPI_FAILURE(rv)) |
| 235 | rv = acpi_power_get_direct(ad); |
| 236 | |
| 237 | if (ACPI_FAILURE(rv)) |
| 238 | goto fail; |
| 239 | |
| 240 | KASSERT(ad->ad_state != ACPI_STATE_ERROR); |
| 241 | |
| 242 | if (ad->ad_state < ACPI_STATE_D0 || ad->ad_state > ACPI_STATE_D3) { |
| 243 | rv = AE_BAD_VALUE; |
| 244 | goto fail; |
| 245 | } |
| 246 | |
| 247 | if (state != NULL) |
| 248 | *state = ad->ad_state; |
| 249 | |
| 250 | return true; |
| 251 | |
| 252 | fail: |
| 253 | ad->ad_state = ACPI_STATE_ERROR; |
| 254 | |
| 255 | if (state != NULL) |
| 256 | *state = ad->ad_state; |
| 257 | |
| 258 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, "failed to get power state " |
| 259 | "for %s: %s\n" , ad->ad_name, AcpiFormatException(rv))); |
| 260 | |
| 261 | return false; |
| 262 | } |
| 263 | |
| 264 | static ACPI_STATUS |
| 265 | acpi_power_get_direct(struct acpi_devnode *ad) |
| 266 | { |
| 267 | ACPI_INTEGER val = 0; |
| 268 | ACPI_STATUS rv; |
| 269 | |
| 270 | rv = acpi_eval_integer(ad->ad_handle, "_PSC" , &val); |
| 271 | |
| 272 | KDASSERT((uint64_t)val < INT_MAX); |
| 273 | |
| 274 | ad->ad_state = (int)val; |
| 275 | |
| 276 | return rv; |
| 277 | } |
| 278 | |
| 279 | static ACPI_STATUS |
| 280 | acpi_power_get_indirect(struct acpi_devnode *ad) |
| 281 | { |
| 282 | ACPI_OBJECT *pkg; |
| 283 | ACPI_STATUS rv; |
| 284 | int i; |
| 285 | |
| 286 | CTASSERT(ACPI_STATE_D0 == 0 && ACPI_STATE_D1 == 1); |
| 287 | CTASSERT(ACPI_STATE_D2 == 2 && ACPI_STATE_D3 == 3); |
| 288 | |
| 289 | /* |
| 290 | * The device is in a given D-state if all resources are on. |
| 291 | * To derive this, evaluate all elements in each _PRx package |
| 292 | * (x = 0 ... 3) and break if the noted condition becomes true. |
| 293 | */ |
| 294 | for (ad->ad_state = ACPI_STATE_D3, i = 0; i < ACPI_STATE_D3; i++) { |
| 295 | |
| 296 | pkg = acpi_power_pkg_get(ad->ad_handle, i); |
| 297 | |
| 298 | if (pkg == NULL) |
| 299 | continue; |
| 300 | |
| 301 | /* |
| 302 | * For each element in the _PRx package, evaluate _STA |
| 303 | * and return AE_OK only if all power resources are on. |
| 304 | */ |
| 305 | rv = acpi_foreach_package_object(pkg, acpi_power_res_sta, ad); |
| 306 | |
| 307 | if (ACPI_FAILURE(rv) && rv != AE_CTRL_FALSE) |
| 308 | goto out; |
| 309 | |
| 310 | if (ACPI_SUCCESS(rv)) { |
| 311 | ad->ad_state = i; |
| 312 | goto out; |
| 313 | } |
| 314 | |
| 315 | ACPI_FREE(pkg); pkg = NULL; |
| 316 | } |
| 317 | |
| 318 | KASSERT(ad->ad_state == ACPI_STATE_D3); |
| 319 | |
| 320 | return AE_OK; |
| 321 | |
| 322 | out: |
| 323 | ACPI_FREE(pkg); |
| 324 | |
| 325 | return rv; |
| 326 | } |
| 327 | |
| 328 | /* |
| 329 | * Set the D-state of an ACPI device node. |
| 330 | */ |
| 331 | bool |
| 332 | acpi_power_set(ACPI_HANDLE hdl, int state) |
| 333 | { |
| 334 | struct acpi_devnode *ad = acpi_match_node(hdl); |
| 335 | ACPI_STATUS rv; |
| 336 | char path[5]; |
| 337 | int old; |
| 338 | |
| 339 | if (ad == NULL) |
| 340 | return false; |
| 341 | |
| 342 | if (state < ACPI_STATE_D0 || state > ACPI_STATE_D3) { |
| 343 | rv = AE_BAD_PARAMETER; |
| 344 | goto fail; |
| 345 | } |
| 346 | |
| 347 | if (acpi_power_get(ad->ad_handle, &old) != true) { |
| 348 | rv = AE_NOT_FOUND; |
| 349 | goto fail; |
| 350 | } |
| 351 | |
| 352 | KASSERT(ad->ad_state == old); |
| 353 | KASSERT(ad->ad_state != ACPI_STATE_ERROR); |
| 354 | |
| 355 | if (ad->ad_state == state) { |
| 356 | rv = AE_ALREADY_EXISTS; |
| 357 | goto fail; |
| 358 | } |
| 359 | |
| 360 | /* |
| 361 | * It is only possible to go to D0 ("on") from D3 ("off"). |
| 362 | */ |
| 363 | if (ad->ad_state == ACPI_STATE_D3 && state != ACPI_STATE_D0) { |
| 364 | rv = AE_BAD_PARAMETER; |
| 365 | goto fail; |
| 366 | } |
| 367 | |
| 368 | /* |
| 369 | * As noted in ACPI 4.0 (appendix A.2.1), the bus power state |
| 370 | * should never be lower than the highest state of one of its |
| 371 | * devices. Consequently, we cannot set the state to a lower |
| 372 | * (i.e. higher power) state than the parent device's state. |
| 373 | */ |
| 374 | if ((ad->ad_parent != NULL) && |
| 375 | (ad->ad_parent->ad_flags & ACPI_DEVICE_POWER) != 0) { |
| 376 | |
| 377 | if (ad->ad_parent->ad_state > state) { |
| 378 | rv = AE_ABORT_METHOD; |
| 379 | goto fail; |
| 380 | } |
| 381 | } |
| 382 | |
| 383 | /* |
| 384 | * We first sweep through the resources required for the target |
| 385 | * state, turning things on and building references. After this |
| 386 | * we dereference the resources required for the current state, |
| 387 | * turning the resources off as we go. |
| 388 | */ |
| 389 | rv = acpi_power_switch(ad, state, true); |
| 390 | |
| 391 | if (ACPI_FAILURE(rv) && rv != AE_CTRL_CONTINUE) |
| 392 | goto fail; |
| 393 | |
| 394 | rv = acpi_power_switch(ad, ad->ad_state, false); |
| 395 | |
| 396 | if (ACPI_FAILURE(rv) && rv != AE_CTRL_CONTINUE) |
| 397 | goto fail; |
| 398 | |
| 399 | /* |
| 400 | * Last but not least, invoke the power state switch method, |
| 401 | * if available. Because some systems use only _PSx for the |
| 402 | * power state transitions, we do this even if there is no _PRx. |
| 403 | */ |
| 404 | (void)snprintf(path, sizeof(path), "_PS%d" , state); |
| 405 | (void)AcpiEvaluateObject(ad->ad_handle, path, NULL, NULL); |
| 406 | |
| 407 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, "%s turned from " |
| 408 | "D%d to D%d\n" , ad->ad_name, old, state)); |
| 409 | |
| 410 | ad->ad_state = state; |
| 411 | |
| 412 | return true; |
| 413 | |
| 414 | fail: |
| 415 | ad->ad_state = ACPI_STATE_ERROR; |
| 416 | |
| 417 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, "failed to set power state to D%d " |
| 418 | "for %s: %s\n" , state, ad->ad_name, AcpiFormatException(rv))); |
| 419 | |
| 420 | return false; |
| 421 | } |
| 422 | |
| 423 | static ACPI_STATUS |
| 424 | acpi_power_switch(struct acpi_devnode *ad, int state, bool on) |
| 425 | { |
| 426 | ACPI_OBJECT *elm, *pkg; |
| 427 | ACPI_STATUS rv = AE_OK; |
| 428 | ACPI_HANDLE hdl; |
| 429 | uint32_t i, n; |
| 430 | |
| 431 | /* |
| 432 | * For each element in the _PRx package, fetch |
| 433 | * the reference handle, search for this handle |
| 434 | * from the power resource queue, and turn the |
| 435 | * resource behind the handle on or off. |
| 436 | */ |
| 437 | pkg = acpi_power_pkg_get(ad->ad_handle, state); |
| 438 | |
| 439 | if (pkg == NULL) |
| 440 | return AE_CTRL_CONTINUE; |
| 441 | |
| 442 | n = pkg->Package.Count; |
| 443 | |
| 444 | for (i = 0; i < n; i++) { |
| 445 | |
| 446 | elm = &pkg->Package.Elements[i]; |
| 447 | rv = acpi_eval_reference_handle(elm, &hdl); |
| 448 | |
| 449 | if (ACPI_FAILURE(rv)) |
| 450 | continue; |
| 451 | |
| 452 | (void)acpi_power_res(hdl, ad->ad_handle, on); |
| 453 | } |
| 454 | |
| 455 | ACPI_FREE(pkg); |
| 456 | |
| 457 | return rv; |
| 458 | } |
| 459 | |
| 460 | ACPI_STATUS |
| 461 | acpi_power_res(ACPI_HANDLE hdl, ACPI_HANDLE ref, bool on) |
| 462 | { |
| 463 | struct acpi_power_res *res; |
| 464 | const char *str; |
| 465 | ACPI_STATUS rv; |
| 466 | |
| 467 | /* |
| 468 | * Search for the resource. |
| 469 | */ |
| 470 | res = acpi_power_res_get(hdl); |
| 471 | |
| 472 | if (res == NULL) |
| 473 | return AE_NOT_FOUND; |
| 474 | |
| 475 | if (ref == NULL) |
| 476 | return AE_BAD_PARAMETER; |
| 477 | |
| 478 | /* |
| 479 | * Adjust the reference counting. This is |
| 480 | * necessary since a single power resource |
| 481 | * can be shared by multiple devices. |
| 482 | */ |
| 483 | if (on) { |
| 484 | rv = acpi_power_res_ref(res, ref); |
| 485 | str = "_ON" ; |
| 486 | } else { |
| 487 | rv = acpi_power_res_deref(res, ref); |
| 488 | str = "_OFF" ; |
| 489 | } |
| 490 | |
| 491 | if (ACPI_FAILURE(rv)) |
| 492 | return rv; |
| 493 | |
| 494 | /* |
| 495 | * Turn the resource on or off. |
| 496 | */ |
| 497 | return AcpiEvaluateObject(res->res_handle, str, NULL, NULL); |
| 498 | } |
| 499 | |
| 500 | static ACPI_STATUS |
| 501 | acpi_power_res_ref(struct acpi_power_res *res, ACPI_HANDLE ref) |
| 502 | { |
| 503 | size_t i, j = SIZE_MAX; |
| 504 | |
| 505 | mutex_enter(&res->res_mutex); |
| 506 | |
| 507 | for (i = 0; i < __arraycount(res->res_ref); i++) { |
| 508 | |
| 509 | /* |
| 510 | * Do not error out if the handle |
| 511 | * has already been referenced. |
| 512 | */ |
| 513 | if (res->res_ref[i] == ref) { |
| 514 | mutex_exit(&res->res_mutex); |
| 515 | return AE_OK; |
| 516 | } |
| 517 | |
| 518 | if (j == SIZE_MAX && res->res_ref[i] == NULL) |
| 519 | j = i; |
| 520 | } |
| 521 | |
| 522 | if (j == SIZE_MAX) { |
| 523 | mutex_exit(&res->res_mutex); |
| 524 | return AE_LIMIT; |
| 525 | } |
| 526 | |
| 527 | res->res_ref[j] = ref; |
| 528 | mutex_exit(&res->res_mutex); |
| 529 | |
| 530 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, "%s referenced " |
| 531 | "by %s\n" , res->res_name, acpi_xname(ref))); |
| 532 | |
| 533 | return AE_OK; |
| 534 | } |
| 535 | |
| 536 | static ACPI_STATUS |
| 537 | acpi_power_res_deref(struct acpi_power_res *res, ACPI_HANDLE ref) |
| 538 | { |
| 539 | size_t i; |
| 540 | |
| 541 | mutex_enter(&res->res_mutex); |
| 542 | |
| 543 | for (i = 0; i < __arraycount(res->res_ref); i++) { |
| 544 | |
| 545 | if (res->res_ref[i] != ref) |
| 546 | continue; |
| 547 | |
| 548 | res->res_ref[i] = NULL; |
| 549 | mutex_exit(&res->res_mutex); |
| 550 | |
| 551 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, "%s dereferenced " |
| 552 | "by %s\n" , res->res_name, acpi_xname(ref))); |
| 553 | |
| 554 | return AE_OK; |
| 555 | } |
| 556 | |
| 557 | /* |
| 558 | * If the array remains to be non-empty, |
| 559 | * something else is using the resource |
| 560 | * and hence it can not be turned off. |
| 561 | */ |
| 562 | mutex_exit(&res->res_mutex); |
| 563 | |
| 564 | return AE_ABORT_METHOD; |
| 565 | } |
| 566 | |
| 567 | static ACPI_STATUS |
| 568 | acpi_power_res_sta(ACPI_OBJECT *elm, void *arg) |
| 569 | { |
| 570 | ACPI_INTEGER val; |
| 571 | ACPI_HANDLE hdl; |
| 572 | ACPI_STATUS rv; |
| 573 | |
| 574 | rv = acpi_eval_reference_handle(elm, &hdl); |
| 575 | |
| 576 | if (ACPI_FAILURE(rv)) |
| 577 | goto fail; |
| 578 | |
| 579 | rv = acpi_eval_integer(hdl, "_STA" , &val); |
| 580 | |
| 581 | if (ACPI_FAILURE(rv)) |
| 582 | goto fail; |
| 583 | |
| 584 | KDASSERT((uint64_t)val < INT_MAX); |
| 585 | |
| 586 | if ((int)val != ACPI_STA_POW_ON && (int)val != ACPI_STA_POW_OFF) |
| 587 | return AE_BAD_VALUE; |
| 588 | |
| 589 | if ((int)val != ACPI_STA_POW_ON) |
| 590 | return AE_CTRL_FALSE; /* XXX: Not an error. */ |
| 591 | |
| 592 | return AE_OK; |
| 593 | |
| 594 | fail: |
| 595 | if (rv == AE_CTRL_FALSE) |
| 596 | rv = AE_ERROR; |
| 597 | |
| 598 | ACPI_DEBUG_PRINT((ACPI_DB_DEBUG_OBJECT, "failed to evaluate _STA " |
| 599 | "for %s: %s\n" , acpi_xname(hdl), AcpiFormatException(rv))); |
| 600 | |
| 601 | return rv; |
| 602 | } |
| 603 | |
| 604 | static ACPI_OBJECT * |
| 605 | acpi_power_pkg_get(ACPI_HANDLE hdl, int state) |
| 606 | { |
| 607 | char path[5] = "_PR?" ; |
| 608 | ACPI_OBJECT *obj; |
| 609 | ACPI_BUFFER buf; |
| 610 | ACPI_STATUS rv; |
| 611 | |
| 612 | path[3] = '0' + state; |
| 613 | |
| 614 | rv = acpi_eval_struct(hdl, path, &buf); |
| 615 | |
| 616 | if (ACPI_FAILURE(rv)) |
| 617 | goto fail; |
| 618 | |
| 619 | if (buf.Length == 0) { |
| 620 | rv = AE_LIMIT; |
| 621 | goto fail; |
| 622 | } |
| 623 | |
| 624 | obj = buf.Pointer; |
| 625 | |
| 626 | if (obj->Type != ACPI_TYPE_PACKAGE) { |
| 627 | rv = AE_TYPE; |
| 628 | goto fail; |
| 629 | } |
| 630 | |
| 631 | if (obj->Package.Count == 0) { |
| 632 | rv = AE_LIMIT; |
| 633 | goto fail; |
| 634 | } |
| 635 | |
| 636 | return obj; |
| 637 | |
| 638 | fail: |
| 639 | if (buf.Pointer != NULL) |
| 640 | ACPI_FREE(buf.Pointer); |
| 641 | |
| 642 | ACPI_DEBUG_PRINT((ACPI_DB_DEBUG_OBJECT, "failed to evaluate %s for " |
| 643 | "%s: %s\n" , path, acpi_xname(hdl), AcpiFormatException(rv))); |
| 644 | |
| 645 | return NULL; |
| 646 | } |
| 647 | |
| 648 | SYSCTL_SETUP(sysctl_acpi_power_setup, "sysctl hw.acpi.power subtree setup" ) |
| 649 | { |
| 650 | const struct sysctlnode *anode; |
| 651 | int err; |
| 652 | |
| 653 | err = sysctl_createv(NULL, 0, NULL, &anode, |
| 654 | CTLFLAG_PERMANENT, CTLTYPE_NODE, "acpi" , |
| 655 | NULL, NULL, 0, NULL, 0, |
| 656 | CTL_HW, CTL_CREATE, CTL_EOL); |
| 657 | |
| 658 | if (err != 0) |
| 659 | return; |
| 660 | |
| 661 | acpi_power_acpinode = anode->sysctl_num; |
| 662 | |
| 663 | err = sysctl_createv(NULL, 0, &anode, &anode, |
| 664 | CTLFLAG_PERMANENT, CTLTYPE_NODE, |
| 665 | "power" , SYSCTL_DESCR("ACPI device power states" ), |
| 666 | NULL, 0, NULL, 0, |
| 667 | CTL_CREATE, CTL_EOL); |
| 668 | |
| 669 | if (err != 0) |
| 670 | return; |
| 671 | |
| 672 | acpi_power_powernode = anode->sysctl_num; |
| 673 | } |
| 674 | |
| 675 | void |
| 676 | acpi_power_add(struct acpi_devnode *ad) |
| 677 | { |
| 678 | const char *str = NULL; |
| 679 | device_t dev; |
| 680 | int err; |
| 681 | |
| 682 | KASSERT(ad != NULL && ad->ad_root != NULL); |
| 683 | KASSERT((ad->ad_flags & ACPI_DEVICE_POWER) != 0); |
| 684 | |
| 685 | if (acpi_power_acpinode == CTL_EOL || |
| 686 | acpi_power_powernode == CTL_EOL) |
| 687 | return; |
| 688 | |
| 689 | if (ad->ad_device != NULL) |
| 690 | str = device_xname(ad->ad_device); |
| 691 | else { |
| 692 | dev = acpi_pcidev_find_dev(ad); |
| 693 | |
| 694 | if (dev != NULL) |
| 695 | str = device_xname(dev); |
| 696 | } |
| 697 | |
| 698 | if (str == NULL) |
| 699 | return; |
| 700 | |
| 701 | err = sysctl_createv(NULL, 0, NULL, NULL, |
| 702 | CTLFLAG_READONLY, CTLTYPE_STRING, str, |
| 703 | NULL, acpi_power_sysctl, 0, (void *)ad, 0, CTL_HW, |
| 704 | acpi_power_acpinode, acpi_power_powernode, |
| 705 | CTL_CREATE, CTL_EOL); |
| 706 | |
| 707 | if (err != 0) |
| 708 | aprint_error_dev(ad->ad_root, "sysctl_createv" |
| 709 | "(hw.acpi.power.%s) failed (err %d)\n" , str, err); |
| 710 | } |
| 711 | |
| 712 | static int |
| 713 | acpi_power_sysctl(SYSCTLFN_ARGS) |
| 714 | { |
| 715 | struct acpi_devnode *ad; |
| 716 | struct sysctlnode node; |
| 717 | int err, state; |
| 718 | char t[3]; |
| 719 | |
| 720 | node = *rnode; |
| 721 | ad = rnode->sysctl_data; |
| 722 | |
| 723 | if (acpi_power_get(ad->ad_handle, &state) != true) |
| 724 | state = 0; |
| 725 | |
| 726 | (void)memset(t, '\0', sizeof(t)); |
| 727 | (void)snprintf(t, sizeof(t), "D%d" , state); |
| 728 | |
| 729 | node.sysctl_data = &t; |
| 730 | |
| 731 | err = sysctl_lookup(SYSCTLFN_CALL(&node)); |
| 732 | |
| 733 | if (err || newp == NULL) |
| 734 | return err; |
| 735 | |
| 736 | return 0; |
| 737 | } |
| 738 | |
| 739 | /* |
| 740 | * XXX: Move this to acpi_util.c by refactoring |
| 741 | * acpi_name() to optionally return a single name. |
| 742 | */ |
| 743 | static const char * |
| 744 | acpi_xname(ACPI_HANDLE hdl) |
| 745 | { |
| 746 | static char str[5]; |
| 747 | ACPI_BUFFER buf; |
| 748 | ACPI_STATUS rv; |
| 749 | |
| 750 | buf.Pointer = str; |
| 751 | buf.Length = sizeof(str); |
| 752 | |
| 753 | rv = AcpiGetName(hdl, ACPI_SINGLE_NAME, &buf); |
| 754 | |
| 755 | if (ACPI_FAILURE(rv)) |
| 756 | return "????" ; |
| 757 | |
| 758 | return str; |
| 759 | } |
| 760 | |