1 /*- 2 * Copyright (c) 2002-2003 Taku YAMAMOTO <taku@cent.saitama-u.ac.jp> 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 * $Id: acpi_vid.c,v 1.4 2003/10/13 10:07:36 taku Exp $ 27 */ 28 29 #include <sys/cdefs.h> 30 __FBSDID("$FreeBSD$"); 31 32 #include "opt_evdev.h" 33 34 #include <sys/param.h> 35 #include <sys/bus.h> 36 #include <sys/eventhandler.h> 37 #include <sys/kernel.h> 38 #include <sys/malloc.h> 39 #include <sys/module.h> 40 #include <sys/power.h> 41 #include <sys/queue.h> 42 #include <sys/sysctl.h> 43 44 #include <contrib/dev/acpica/include/acpi.h> 45 46 #include <dev/acpica/acpivar.h> 47 48 #ifdef EVDEV_SUPPORT 49 #include <dev/evdev/input.h> 50 #include <dev/evdev/evdev.h> 51 #endif 52 53 /* ACPI video extension driver. */ 54 struct acpi_video_output { 55 ACPI_HANDLE handle; 56 UINT32 adr; 57 STAILQ_ENTRY(acpi_video_output) vo_next; 58 struct { 59 int num; 60 STAILQ_ENTRY(acpi_video_output) next; 61 } vo_unit; 62 int vo_hasbqc; /* Query method is present. */ 63 int vo_level; /* Cached level when !vo_hasbqc. */ 64 int vo_brightness; 65 int vo_fullpower; 66 int vo_economy; 67 int vo_numlevels; 68 int *vo_levels; 69 struct sysctl_ctx_list vo_sysctl_ctx; 70 struct sysctl_oid *vo_sysctl_tree; 71 #ifdef EVDEV_SUPPORT 72 struct evdev_dev *evdev; 73 #endif 74 }; 75 76 STAILQ_HEAD(acpi_video_output_queue, acpi_video_output); 77 78 struct acpi_video_softc { 79 device_t device; 80 ACPI_HANDLE handle; 81 struct acpi_video_output_queue vid_outputs; 82 eventhandler_tag vid_pwr_evh; 83 #ifdef EVDEV_SUPPORT 84 struct evdev_dev *evdev; 85 #endif 86 }; 87 88 /* interfaces */ 89 static int acpi_video_modevent(struct module*, int, void *); 90 static void acpi_video_identify(driver_t *driver, device_t parent); 91 static int acpi_video_probe(device_t); 92 static int acpi_video_attach(device_t); 93 static int acpi_video_detach(device_t); 94 static int acpi_video_resume(device_t); 95 static int acpi_video_shutdown(device_t); 96 static void acpi_video_notify_handler(ACPI_HANDLE, UINT32, void *); 97 static void acpi_video_power_profile(void *); 98 static void acpi_video_bind_outputs(struct acpi_video_softc *); 99 static struct acpi_video_output *acpi_video_vo_init(UINT32); 100 static void acpi_video_vo_bind(struct acpi_video_output *, ACPI_HANDLE); 101 static void acpi_video_vo_destroy(struct acpi_video_output *); 102 static int acpi_video_vo_check_level(struct acpi_video_output *, int); 103 static void acpi_video_vo_notify_handler(ACPI_HANDLE, UINT32, void *); 104 static int acpi_video_vo_active_sysctl(SYSCTL_HANDLER_ARGS); 105 static int acpi_video_vo_bright_sysctl(SYSCTL_HANDLER_ARGS); 106 static int acpi_video_vo_presets_sysctl(SYSCTL_HANDLER_ARGS); 107 static int acpi_video_vo_levels_sysctl(SYSCTL_HANDLER_ARGS); 108 109 /* operations */ 110 static void vid_set_switch_policy(ACPI_HANDLE, UINT32); 111 static int vid_enum_outputs(ACPI_HANDLE, 112 void(*)(ACPI_HANDLE, UINT32, void *), void *); 113 static int vo_get_brightness_levels(ACPI_HANDLE, int **); 114 static int vo_get_brightness(struct acpi_video_output *); 115 static void vo_set_brightness(struct acpi_video_output *, int); 116 static UINT32 vo_get_device_status(ACPI_HANDLE); 117 static UINT32 vo_get_graphics_state(ACPI_HANDLE); 118 static void vo_set_device_state(ACPI_HANDLE, UINT32); 119 120 /* events */ 121 #define VID_NOTIFY_SWITCHED 0x80 122 #define VID_NOTIFY_REPROBE 0x81 123 #define VID_NOTIFY_CYCLE_OUT 0x82 124 #define VID_NOTIFY_NEXT_OUT 0x83 125 #define VID_NOTIFY_PREV_OUT 0x84 126 #define VID_NOTIFY_CYCLE_BRN 0x85 127 #define VID_NOTIFY_INC_BRN 0x86 128 #define VID_NOTIFY_DEC_BRN 0x87 129 #define VID_NOTIFY_ZERO_BRN 0x88 130 #define VID_NOTIFY_DISP_OFF 0x89 131 132 /* _DOS (Enable/Disable Output Switching) argument bits */ 133 #define DOS_SWITCH_MASK 3 134 #define DOS_SWITCH_BY_OSPM 0 135 #define DOS_SWITCH_BY_BIOS 1 136 #define DOS_SWITCH_LOCKED 2 137 #define DOS_BRIGHTNESS_BY_OSPM (1 << 2) 138 139 /* _DOD and subdev's _ADR */ 140 #define DOD_DEVID_MASK 0x0f00 141 #define DOD_DEVID_MASK_FULL 0xffff 142 #define DOD_DEVID_MASK_DISPIDX 0x000f 143 #define DOD_DEVID_MASK_DISPPORT 0x00f0 144 #define DOD_DEVID_MONITOR 0x0100 145 #define DOD_DEVID_LCD 0x0110 146 #define DOD_DEVID_TV 0x0200 147 #define DOD_DEVID_EXT 0x0300 148 #define DOD_DEVID_INTDFP 0x0400 149 #define DOD_BIOS (1 << 16) 150 #define DOD_NONVGA (1 << 17) 151 #define DOD_HEAD_ID_SHIFT 18 152 #define DOD_HEAD_ID_BITS 3 153 #define DOD_HEAD_ID_MASK \ 154 (((1 << DOD_HEAD_ID_BITS) - 1) << DOD_HEAD_ID_SHIFT) 155 #define DOD_DEVID_SCHEME_STD (1U << 31) 156 157 /* _BCL related constants */ 158 #define BCL_FULLPOWER 0 159 #define BCL_ECONOMY 1 160 161 /* _DCS (Device Currrent Status) value bits and masks. */ 162 #define DCS_EXISTS (1 << 0) 163 #define DCS_ACTIVE (1 << 1) 164 #define DCS_READY (1 << 2) 165 #define DCS_FUNCTIONAL (1 << 3) 166 #define DCS_ATTACHED (1 << 4) 167 168 /* _DSS (Device Set Status) argument bits and masks. */ 169 #define DSS_INACTIVE 0 170 #define DSS_ACTIVE (1 << 0) 171 #define DSS_SETNEXT (1 << 30) 172 #define DSS_COMMIT (1U << 31) 173 174 static device_method_t acpi_video_methods[] = { 175 DEVMETHOD(device_identify, acpi_video_identify), 176 DEVMETHOD(device_probe, acpi_video_probe), 177 DEVMETHOD(device_attach, acpi_video_attach), 178 DEVMETHOD(device_detach, acpi_video_detach), 179 DEVMETHOD(device_resume, acpi_video_resume), 180 DEVMETHOD(device_shutdown, acpi_video_shutdown), 181 { 0, 0 } 182 }; 183 184 static driver_t acpi_video_driver = { 185 "acpi_video", 186 acpi_video_methods, 187 sizeof(struct acpi_video_softc), 188 }; 189 190 static devclass_t acpi_video_devclass; 191 192 DRIVER_MODULE(acpi_video, vgapci, acpi_video_driver, acpi_video_devclass, 193 acpi_video_modevent, NULL); 194 MODULE_DEPEND(acpi_video, acpi, 1, 1, 1); 195 #ifdef EVDEV_SUPPORT 196 MODULE_DEPEND(acpi_video, evdev, 1, 1, 1); 197 #endif 198 199 static struct sysctl_ctx_list acpi_video_sysctl_ctx; 200 static struct sysctl_oid *acpi_video_sysctl_tree; 201 static struct acpi_video_output_queue crt_units, tv_units, 202 ext_units, lcd_units, other_units; 203 204 /* 205 * The 'video' lock protects the hierarchy of video output devices 206 * (the video "bus"). The 'video_output' lock protects per-output 207 * data is equivalent to a softc lock for each video output. 208 */ 209 ACPI_SERIAL_DECL(video, "ACPI video"); 210 ACPI_SERIAL_DECL(video_output, "ACPI video output"); 211 static MALLOC_DEFINE(M_ACPIVIDEO, "acpivideo", "ACPI video extension"); 212 213 #ifdef EVDEV_SUPPORT 214 static const struct { 215 UINT32 notify; 216 uint16_t key; 217 } acpi_video_evdev_map[] = { 218 { VID_NOTIFY_SWITCHED, KEY_SWITCHVIDEOMODE }, 219 { VID_NOTIFY_REPROBE, KEY_SWITCHVIDEOMODE }, 220 { VID_NOTIFY_CYCLE_OUT, KEY_SWITCHVIDEOMODE }, 221 { VID_NOTIFY_NEXT_OUT, KEY_VIDEO_NEXT }, 222 { VID_NOTIFY_PREV_OUT, KEY_VIDEO_PREV }, 223 { VID_NOTIFY_CYCLE_BRN, KEY_BRIGHTNESS_CYCLE }, 224 { VID_NOTIFY_INC_BRN, KEY_BRIGHTNESSUP }, 225 { VID_NOTIFY_DEC_BRN, KEY_BRIGHTNESSDOWN }, 226 { VID_NOTIFY_ZERO_BRN, KEY_BRIGHTNESS_ZERO }, 227 { VID_NOTIFY_DISP_OFF, KEY_DISPLAY_OFF }, 228 }; 229 230 static void 231 acpi_video_push_evdev_event(struct evdev_dev *evdev, UINT32 notify) 232 { 233 int i; 234 uint16_t key; 235 236 /* Do not allow to execute 2 instances this routine concurently */ 237 ACPI_SERIAL_ASSERT(video_output); 238 239 for (i = 0; i < nitems(acpi_video_evdev_map); i++) { 240 if (acpi_video_evdev_map[i].notify == notify) { 241 key = acpi_video_evdev_map[i].key; 242 evdev_push_key(evdev, key, 1); 243 evdev_sync(evdev); 244 evdev_push_key(evdev, key, 0); 245 evdev_sync(evdev); 246 break; 247 } 248 } 249 } 250 #endif 251 252 static int 253 acpi_video_modevent(struct module *mod __unused, int evt, void *cookie __unused) 254 { 255 int err; 256 257 err = 0; 258 switch (evt) { 259 case MOD_LOAD: 260 sysctl_ctx_init(&acpi_video_sysctl_ctx); 261 STAILQ_INIT(&crt_units); 262 STAILQ_INIT(&tv_units); 263 STAILQ_INIT(&ext_units); 264 STAILQ_INIT(&lcd_units); 265 STAILQ_INIT(&other_units); 266 break; 267 case MOD_UNLOAD: 268 sysctl_ctx_free(&acpi_video_sysctl_ctx); 269 acpi_video_sysctl_tree = NULL; 270 break; 271 default: 272 err = EINVAL; 273 } 274 275 return (err); 276 } 277 278 static void 279 acpi_video_identify(driver_t *driver, device_t parent) 280 { 281 282 if (device_find_child(parent, "acpi_video", -1) == NULL) 283 device_add_child(parent, "acpi_video", -1); 284 } 285 286 static int 287 acpi_video_probe(device_t dev) 288 { 289 ACPI_HANDLE devh, h; 290 ACPI_OBJECT_TYPE t_dos; 291 292 devh = acpi_get_handle(dev); 293 if (acpi_disabled("video") || 294 ACPI_FAILURE(AcpiGetHandle(devh, "_DOD", &h)) || 295 ACPI_FAILURE(AcpiGetHandle(devh, "_DOS", &h)) || 296 ACPI_FAILURE(AcpiGetType(h, &t_dos)) || 297 t_dos != ACPI_TYPE_METHOD) 298 return (ENXIO); 299 300 device_set_desc(dev, "ACPI video extension"); 301 return (0); 302 } 303 304 static int 305 acpi_video_attach(device_t dev) 306 { 307 struct acpi_softc *acpi_sc; 308 struct acpi_video_softc *sc; 309 #ifdef EVDEV_SUPPORT 310 int i; 311 #endif 312 313 sc = device_get_softc(dev); 314 315 acpi_sc = devclass_get_softc(devclass_find("acpi"), 0); 316 if (acpi_sc == NULL) 317 return (ENXIO); 318 319 #ifdef EVDEV_SUPPORT 320 sc->evdev = evdev_alloc(); 321 evdev_set_name(sc->evdev, device_get_desc(dev)); 322 evdev_set_phys(sc->evdev, device_get_nameunit(dev)); 323 evdev_set_id(sc->evdev, BUS_HOST, 0, 0, 1); 324 evdev_support_event(sc->evdev, EV_SYN); 325 evdev_support_event(sc->evdev, EV_KEY); 326 for (i = 0; i < nitems(acpi_video_evdev_map); i++) 327 evdev_support_key(sc->evdev, acpi_video_evdev_map[i].key); 328 329 if (evdev_register(sc->evdev) != 0) 330 return (ENXIO); 331 #endif 332 333 ACPI_SERIAL_BEGIN(video); 334 if (acpi_video_sysctl_tree == NULL) { 335 acpi_video_sysctl_tree = SYSCTL_ADD_NODE(&acpi_video_sysctl_ctx, 336 SYSCTL_CHILDREN(acpi_sc->acpi_sysctl_tree), OID_AUTO, 337 "video", CTLFLAG_RD | CTLFLAG_MPSAFE, 0, 338 "video extension control"); 339 } 340 ACPI_SERIAL_END(video); 341 342 sc->device = dev; 343 sc->handle = acpi_get_handle(dev); 344 STAILQ_INIT(&sc->vid_outputs); 345 346 AcpiInstallNotifyHandler(sc->handle, ACPI_DEVICE_NOTIFY, 347 acpi_video_notify_handler, sc); 348 sc->vid_pwr_evh = EVENTHANDLER_REGISTER(power_profile_change, 349 acpi_video_power_profile, sc, 0); 350 351 ACPI_SERIAL_BEGIN(video); 352 acpi_video_bind_outputs(sc); 353 ACPI_SERIAL_END(video); 354 355 /* 356 * Notify the BIOS that we want to switch both active outputs and 357 * brightness levels. 358 */ 359 vid_set_switch_policy(sc->handle, DOS_SWITCH_BY_OSPM | 360 DOS_BRIGHTNESS_BY_OSPM); 361 362 acpi_video_power_profile(sc); 363 364 return (0); 365 } 366 367 static int 368 acpi_video_detach(device_t dev) 369 { 370 struct acpi_video_softc *sc; 371 struct acpi_video_output *vo, *vn; 372 373 sc = device_get_softc(dev); 374 375 vid_set_switch_policy(sc->handle, DOS_SWITCH_BY_BIOS); 376 EVENTHANDLER_DEREGISTER(power_profile_change, sc->vid_pwr_evh); 377 AcpiRemoveNotifyHandler(sc->handle, ACPI_DEVICE_NOTIFY, 378 acpi_video_notify_handler); 379 380 ACPI_SERIAL_BEGIN(video); 381 STAILQ_FOREACH_SAFE(vo, &sc->vid_outputs, vo_next, vn) { 382 acpi_video_vo_destroy(vo); 383 } 384 ACPI_SERIAL_END(video); 385 386 #ifdef EVDEV_SUPPORT 387 evdev_free(sc->evdev); 388 #endif 389 390 return (0); 391 } 392 393 static int 394 acpi_video_resume(device_t dev) 395 { 396 struct acpi_video_softc *sc; 397 struct acpi_video_output *vo, *vn; 398 int level; 399 400 sc = device_get_softc(dev); 401 402 /* Restore brightness level */ 403 ACPI_SERIAL_BEGIN(video); 404 ACPI_SERIAL_BEGIN(video_output); 405 STAILQ_FOREACH_SAFE(vo, &sc->vid_outputs, vo_next, vn) { 406 if ((vo->adr & DOD_DEVID_MASK_FULL) != DOD_DEVID_LCD && 407 (vo->adr & DOD_DEVID_MASK) != DOD_DEVID_INTDFP) 408 continue; 409 410 if ((vo_get_device_status(vo->handle) & DCS_ACTIVE) == 0) 411 continue; 412 413 level = vo_get_brightness(vo); 414 if (level != -1) 415 vo_set_brightness(vo, level); 416 } 417 ACPI_SERIAL_END(video_output); 418 ACPI_SERIAL_END(video); 419 420 return (0); 421 } 422 423 static int 424 acpi_video_shutdown(device_t dev) 425 { 426 struct acpi_video_softc *sc; 427 428 sc = device_get_softc(dev); 429 vid_set_switch_policy(sc->handle, DOS_SWITCH_BY_BIOS); 430 431 return (0); 432 } 433 434 static void 435 acpi_video_invoke_event_handler(void *context) 436 { 437 EVENTHANDLER_INVOKE(acpi_video_event, (int)(intptr_t)context); 438 } 439 440 static void 441 acpi_video_notify_handler(ACPI_HANDLE handle, UINT32 notify, void *context) 442 { 443 struct acpi_video_softc *sc; 444 struct acpi_video_output *vo, *vo_tmp; 445 ACPI_HANDLE lasthand; 446 UINT32 dcs, dss, dss_p; 447 448 sc = (struct acpi_video_softc *)context; 449 450 switch (notify) { 451 case VID_NOTIFY_SWITCHED: 452 dss_p = 0; 453 lasthand = NULL; 454 ACPI_SERIAL_BEGIN(video); 455 ACPI_SERIAL_BEGIN(video_output); 456 STAILQ_FOREACH(vo, &sc->vid_outputs, vo_next) { 457 dss = vo_get_graphics_state(vo->handle); 458 dcs = vo_get_device_status(vo->handle); 459 if (!(dcs & DCS_READY)) 460 dss = DSS_INACTIVE; 461 if (((dcs & DCS_ACTIVE) && dss == DSS_INACTIVE) || 462 (!(dcs & DCS_ACTIVE) && dss == DSS_ACTIVE)) { 463 if (lasthand != NULL) 464 vo_set_device_state(lasthand, dss_p); 465 dss_p = dss; 466 lasthand = vo->handle; 467 } 468 } 469 if (lasthand != NULL) 470 vo_set_device_state(lasthand, dss_p|DSS_COMMIT); 471 ACPI_SERIAL_END(video_output); 472 ACPI_SERIAL_END(video); 473 break; 474 case VID_NOTIFY_REPROBE: 475 ACPI_SERIAL_BEGIN(video); 476 STAILQ_FOREACH(vo, &sc->vid_outputs, vo_next) 477 vo->handle = NULL; 478 acpi_video_bind_outputs(sc); 479 STAILQ_FOREACH_SAFE(vo, &sc->vid_outputs, vo_next, vo_tmp) { 480 if (vo->handle == NULL) { 481 STAILQ_REMOVE(&sc->vid_outputs, vo, 482 acpi_video_output, vo_next); 483 acpi_video_vo_destroy(vo); 484 } 485 } 486 ACPI_SERIAL_END(video); 487 break; 488 /* Next events should not appear if DOS_SWITCH_BY_OSPM policy is set */ 489 case VID_NOTIFY_CYCLE_OUT: 490 case VID_NOTIFY_NEXT_OUT: 491 case VID_NOTIFY_PREV_OUT: 492 default: 493 device_printf(sc->device, "unknown notify event 0x%x\n", 494 notify); 495 } 496 AcpiOsExecute(OSL_NOTIFY_HANDLER, acpi_video_invoke_event_handler, 497 (void *)(uintptr_t)notify); 498 #ifdef EVDEV_SUPPORT 499 ACPI_SERIAL_BEGIN(video_output); 500 acpi_video_push_evdev_event(sc->evdev, notify); 501 ACPI_SERIAL_END(video_output); 502 #endif 503 } 504 505 static void 506 acpi_video_power_profile(void *context) 507 { 508 int state; 509 struct acpi_video_softc *sc; 510 struct acpi_video_output *vo; 511 512 sc = context; 513 state = power_profile_get_state(); 514 if (state != POWER_PROFILE_PERFORMANCE && 515 state != POWER_PROFILE_ECONOMY) 516 return; 517 518 ACPI_SERIAL_BEGIN(video); 519 ACPI_SERIAL_BEGIN(video_output); 520 STAILQ_FOREACH(vo, &sc->vid_outputs, vo_next) { 521 if (vo->vo_levels != NULL && vo->vo_brightness == -1) 522 vo_set_brightness(vo, 523 state == POWER_PROFILE_ECONOMY ? 524 vo->vo_economy : vo->vo_fullpower); 525 } 526 ACPI_SERIAL_END(video_output); 527 ACPI_SERIAL_END(video); 528 } 529 530 static void 531 acpi_video_bind_outputs_subr(ACPI_HANDLE handle, UINT32 adr, void *context) 532 { 533 struct acpi_video_softc *sc; 534 struct acpi_video_output *vo; 535 536 ACPI_SERIAL_ASSERT(video); 537 sc = context; 538 539 STAILQ_FOREACH(vo, &sc->vid_outputs, vo_next) { 540 if (vo->adr == adr) { 541 acpi_video_vo_bind(vo, handle); 542 return; 543 } 544 } 545 vo = acpi_video_vo_init(adr); 546 if (vo != NULL) { 547 #ifdef EVDEV_SUPPORT 548 vo->evdev = sc->evdev; 549 #endif 550 acpi_video_vo_bind(vo, handle); 551 STAILQ_INSERT_TAIL(&sc->vid_outputs, vo, vo_next); 552 } 553 } 554 555 static void 556 acpi_video_bind_outputs(struct acpi_video_softc *sc) 557 { 558 559 ACPI_SERIAL_ASSERT(video); 560 vid_enum_outputs(sc->handle, acpi_video_bind_outputs_subr, sc); 561 } 562 563 static struct acpi_video_output * 564 acpi_video_vo_init(UINT32 adr) 565 { 566 struct acpi_video_output *vn, *vo, *vp; 567 int n, x; 568 char name[8], env[32]; 569 const char *type, *desc; 570 struct acpi_video_output_queue *voqh; 571 572 ACPI_SERIAL_ASSERT(video); 573 574 switch (adr & DOD_DEVID_MASK) { 575 case DOD_DEVID_MONITOR: 576 if ((adr & DOD_DEVID_MASK_FULL) == DOD_DEVID_LCD) { 577 /* DOD_DEVID_LCD is a common, backward compatible ID */ 578 desc = "Internal/Integrated Digital Flat Panel"; 579 type = "lcd"; 580 voqh = &lcd_units; 581 } else { 582 desc = "VGA CRT or VESA Compatible Analog Monitor"; 583 type = "crt"; 584 voqh = &crt_units; 585 } 586 break; 587 case DOD_DEVID_TV: 588 desc = "TV/HDTV or Analog-Video Monitor"; 589 type = "tv"; 590 voqh = &tv_units; 591 break; 592 case DOD_DEVID_EXT: 593 desc = "External Digital Monitor"; 594 type = "ext"; 595 voqh = &ext_units; 596 break; 597 case DOD_DEVID_INTDFP: 598 desc = "Internal/Integrated Digital Flat Panel"; 599 type = "lcd"; 600 voqh = &lcd_units; 601 break; 602 default: 603 desc = "unknown output"; 604 type = "out"; 605 voqh = &other_units; 606 } 607 608 n = 0; 609 vp = NULL; 610 STAILQ_FOREACH(vn, voqh, vo_unit.next) { 611 if (vn->vo_unit.num != n) 612 break; 613 vp = vn; 614 n++; 615 } 616 617 snprintf(name, sizeof(name), "%s%d", type, n); 618 619 vo = malloc(sizeof(*vo), M_ACPIVIDEO, M_NOWAIT); 620 if (vo != NULL) { 621 vo->handle = NULL; 622 vo->adr = adr; 623 vo->vo_unit.num = n; 624 vo->vo_hasbqc = -1; 625 vo->vo_level = -1; 626 vo->vo_brightness = -1; 627 vo->vo_fullpower = -1; /* TODO: override with tunables */ 628 vo->vo_economy = -1; 629 vo->vo_numlevels = 0; 630 vo->vo_levels = NULL; 631 snprintf(env, sizeof(env), "hw.acpi.video.%s.fullpower", name); 632 if (getenv_int(env, &x)) 633 vo->vo_fullpower = x; 634 snprintf(env, sizeof(env), "hw.acpi.video.%s.economy", name); 635 if (getenv_int(env, &x)) 636 vo->vo_economy = x; 637 638 sysctl_ctx_init(&vo->vo_sysctl_ctx); 639 if (vp != NULL) 640 STAILQ_INSERT_AFTER(voqh, vp, vo, vo_unit.next); 641 else 642 STAILQ_INSERT_TAIL(voqh, vo, vo_unit.next); 643 if (acpi_video_sysctl_tree != NULL) 644 vo->vo_sysctl_tree = 645 SYSCTL_ADD_NODE(&vo->vo_sysctl_ctx, 646 SYSCTL_CHILDREN(acpi_video_sysctl_tree), 647 OID_AUTO, name, CTLFLAG_RD | CTLFLAG_MPSAFE, 648 0, desc); 649 if (vo->vo_sysctl_tree != NULL) { 650 SYSCTL_ADD_PROC(&vo->vo_sysctl_ctx, 651 SYSCTL_CHILDREN(vo->vo_sysctl_tree), 652 OID_AUTO, "active", 653 CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_NEEDGIANT, vo, 654 0, acpi_video_vo_active_sysctl, "I", 655 "current activity of this device"); 656 SYSCTL_ADD_PROC(&vo->vo_sysctl_ctx, 657 SYSCTL_CHILDREN(vo->vo_sysctl_tree), 658 OID_AUTO, "brightness", 659 CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_NEEDGIANT, vo, 660 0, acpi_video_vo_bright_sysctl, "I", 661 "current brightness level"); 662 SYSCTL_ADD_PROC(&vo->vo_sysctl_ctx, 663 SYSCTL_CHILDREN(vo->vo_sysctl_tree), 664 OID_AUTO, "fullpower", 665 CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_NEEDGIANT, vo, 666 POWER_PROFILE_PERFORMANCE, 667 acpi_video_vo_presets_sysctl, "I", 668 "preset level for full power mode"); 669 SYSCTL_ADD_PROC(&vo->vo_sysctl_ctx, 670 SYSCTL_CHILDREN(vo->vo_sysctl_tree), 671 OID_AUTO, "economy", 672 CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_NEEDGIANT, vo, 673 POWER_PROFILE_ECONOMY, 674 acpi_video_vo_presets_sysctl, "I", 675 "preset level for economy mode"); 676 SYSCTL_ADD_PROC(&vo->vo_sysctl_ctx, 677 SYSCTL_CHILDREN(vo->vo_sysctl_tree), 678 OID_AUTO, "levels", 679 CTLTYPE_INT | CTLFLAG_RD | CTLFLAG_NEEDGIANT, vo, 680 0, acpi_video_vo_levels_sysctl, "I", 681 "supported brightness levels"); 682 } else 683 printf("%s: sysctl node creation failed\n", type); 684 } else 685 printf("%s: softc allocation failed\n", type); 686 687 if (bootverbose) { 688 printf("found %s(%x)", desc, adr & DOD_DEVID_MASK_FULL); 689 printf(", idx#%x", adr & DOD_DEVID_MASK_DISPIDX); 690 printf(", port#%x", (adr & DOD_DEVID_MASK_DISPPORT) >> 4); 691 if (adr & DOD_BIOS) 692 printf(", detectable by BIOS"); 693 if (adr & DOD_NONVGA) 694 printf(" (Non-VGA output device whose power " 695 "is related to the VGA device)"); 696 printf(", head #%d\n", 697 (adr & DOD_HEAD_ID_MASK) >> DOD_HEAD_ID_SHIFT); 698 } 699 return (vo); 700 } 701 702 static void 703 acpi_video_vo_bind(struct acpi_video_output *vo, ACPI_HANDLE handle) 704 { 705 706 ACPI_SERIAL_BEGIN(video_output); 707 if (vo->vo_levels != NULL) { 708 AcpiRemoveNotifyHandler(vo->handle, ACPI_DEVICE_NOTIFY, 709 acpi_video_vo_notify_handler); 710 AcpiOsFree(vo->vo_levels); 711 vo->vo_levels = NULL; 712 } 713 vo->handle = handle; 714 vo->vo_numlevels = vo_get_brightness_levels(handle, &vo->vo_levels); 715 if (vo->vo_numlevels >= 2) { 716 if (vo->vo_fullpower == -1 || 717 acpi_video_vo_check_level(vo, vo->vo_fullpower) != 0) { 718 /* XXX - can't deal with rebinding... */ 719 vo->vo_fullpower = vo->vo_levels[BCL_FULLPOWER]; 720 } 721 if (vo->vo_economy == -1 || 722 acpi_video_vo_check_level(vo, vo->vo_economy) != 0) { 723 /* XXX - see above. */ 724 vo->vo_economy = vo->vo_levels[BCL_ECONOMY]; 725 } 726 AcpiInstallNotifyHandler(handle, ACPI_DEVICE_NOTIFY, 727 acpi_video_vo_notify_handler, vo); 728 } 729 ACPI_SERIAL_END(video_output); 730 } 731 732 static void 733 acpi_video_vo_destroy(struct acpi_video_output *vo) 734 { 735 struct acpi_video_output_queue *voqh; 736 737 ACPI_SERIAL_ASSERT(video); 738 if (vo->vo_sysctl_tree != NULL) { 739 vo->vo_sysctl_tree = NULL; 740 sysctl_ctx_free(&vo->vo_sysctl_ctx); 741 } 742 if (vo->vo_levels != NULL) { 743 AcpiRemoveNotifyHandler(vo->handle, ACPI_DEVICE_NOTIFY, 744 acpi_video_vo_notify_handler); 745 AcpiOsFree(vo->vo_levels); 746 } 747 748 switch (vo->adr & DOD_DEVID_MASK) { 749 case DOD_DEVID_MONITOR: 750 if ((vo->adr & DOD_DEVID_MASK_FULL) == DOD_DEVID_LCD) 751 voqh = &lcd_units; 752 else 753 voqh = &crt_units; 754 break; 755 case DOD_DEVID_TV: 756 voqh = &tv_units; 757 break; 758 case DOD_DEVID_EXT: 759 voqh = &ext_units; 760 break; 761 case DOD_DEVID_INTDFP: 762 voqh = &lcd_units; 763 break; 764 default: 765 voqh = &other_units; 766 } 767 STAILQ_REMOVE(voqh, vo, acpi_video_output, vo_unit.next); 768 free(vo, M_ACPIVIDEO); 769 } 770 771 static int 772 acpi_video_vo_check_level(struct acpi_video_output *vo, int level) 773 { 774 int i; 775 776 ACPI_SERIAL_ASSERT(video_output); 777 if (vo->vo_levels == NULL) 778 return (ENODEV); 779 for (i = 0; i < vo->vo_numlevels; i++) 780 if (vo->vo_levels[i] == level) 781 return (0); 782 return (EINVAL); 783 } 784 785 static void 786 acpi_video_vo_notify_handler(ACPI_HANDLE handle, UINT32 notify, void *context) 787 { 788 struct acpi_video_output *vo; 789 int i, j, level, new_level; 790 791 vo = context; 792 ACPI_SERIAL_BEGIN(video_output); 793 if (vo->handle != handle) 794 goto out; 795 796 switch (notify) { 797 case VID_NOTIFY_CYCLE_BRN: 798 if (vo->vo_numlevels <= 3) 799 goto out; 800 /* FALLTHROUGH */ 801 case VID_NOTIFY_INC_BRN: 802 case VID_NOTIFY_DEC_BRN: 803 case VID_NOTIFY_ZERO_BRN: 804 case VID_NOTIFY_DISP_OFF: 805 if (vo->vo_levels == NULL) 806 goto out; 807 level = vo_get_brightness(vo); 808 if (level < 0) 809 goto out; 810 break; 811 default: 812 printf("unknown notify event 0x%x from %s\n", 813 notify, acpi_name(handle)); 814 goto out; 815 } 816 817 new_level = level; 818 switch (notify) { 819 case VID_NOTIFY_CYCLE_BRN: 820 for (i = 2; i < vo->vo_numlevels; i++) 821 if (vo->vo_levels[i] == level) { 822 new_level = vo->vo_numlevels > i + 1 ? 823 vo->vo_levels[i + 1] : vo->vo_levels[2]; 824 break; 825 } 826 break; 827 case VID_NOTIFY_INC_BRN: 828 case VID_NOTIFY_DEC_BRN: 829 for (i = 0; i < vo->vo_numlevels; i++) { 830 j = vo->vo_levels[i]; 831 if (notify == VID_NOTIFY_INC_BRN) { 832 if (j > level && 833 (j < new_level || level == new_level)) 834 new_level = j; 835 } else { 836 if (j < level && 837 (j > new_level || level == new_level)) 838 new_level = j; 839 } 840 } 841 break; 842 case VID_NOTIFY_ZERO_BRN: 843 for (i = 0; i < vo->vo_numlevels; i++) 844 if (vo->vo_levels[i] == 0) { 845 new_level = 0; 846 break; 847 } 848 break; 849 case VID_NOTIFY_DISP_OFF: 850 acpi_pwr_switch_consumer(handle, ACPI_STATE_D3); 851 break; 852 } 853 if (new_level != level) { 854 vo_set_brightness(vo, new_level); 855 vo->vo_brightness = new_level; 856 } 857 #ifdef EVDEV_SUPPORT 858 acpi_video_push_evdev_event(vo->evdev, notify); 859 #endif 860 861 out: 862 ACPI_SERIAL_END(video_output); 863 864 AcpiOsExecute(OSL_NOTIFY_HANDLER, acpi_video_invoke_event_handler, 865 (void *)(uintptr_t)notify); 866 } 867 868 /* ARGSUSED */ 869 static int 870 acpi_video_vo_active_sysctl(SYSCTL_HANDLER_ARGS) 871 { 872 struct acpi_video_output *vo; 873 int state, err; 874 875 vo = (struct acpi_video_output *)arg1; 876 if (vo->handle == NULL) 877 return (ENXIO); 878 ACPI_SERIAL_BEGIN(video_output); 879 state = (vo_get_device_status(vo->handle) & DCS_ACTIVE) ? 1 : 0; 880 err = sysctl_handle_int(oidp, &state, 0, req); 881 if (err != 0 || req->newptr == NULL) 882 goto out; 883 vo_set_device_state(vo->handle, 884 DSS_COMMIT | (state ? DSS_ACTIVE : DSS_INACTIVE)); 885 out: 886 ACPI_SERIAL_END(video_output); 887 return (err); 888 } 889 890 /* ARGSUSED */ 891 static int 892 acpi_video_vo_bright_sysctl(SYSCTL_HANDLER_ARGS) 893 { 894 struct acpi_video_output *vo; 895 int level, preset, err; 896 897 vo = (struct acpi_video_output *)arg1; 898 ACPI_SERIAL_BEGIN(video_output); 899 if (vo->handle == NULL) { 900 err = ENXIO; 901 goto out; 902 } 903 if (vo->vo_levels == NULL) { 904 err = ENODEV; 905 goto out; 906 } 907 908 preset = (power_profile_get_state() == POWER_PROFILE_ECONOMY) ? 909 vo->vo_economy : vo->vo_fullpower; 910 level = vo->vo_brightness; 911 if (level == -1) 912 level = preset; 913 914 err = sysctl_handle_int(oidp, &level, 0, req); 915 if (err != 0 || req->newptr == NULL) 916 goto out; 917 if (level < -1 || level > 100) { 918 err = EINVAL; 919 goto out; 920 } 921 922 if (level != -1 && (err = acpi_video_vo_check_level(vo, level))) 923 goto out; 924 vo->vo_brightness = level; 925 vo_set_brightness(vo, (level == -1) ? preset : level); 926 927 out: 928 ACPI_SERIAL_END(video_output); 929 return (err); 930 } 931 932 static int 933 acpi_video_vo_presets_sysctl(SYSCTL_HANDLER_ARGS) 934 { 935 struct acpi_video_output *vo; 936 int i, level, *preset, err; 937 938 vo = (struct acpi_video_output *)arg1; 939 ACPI_SERIAL_BEGIN(video_output); 940 if (vo->handle == NULL) { 941 err = ENXIO; 942 goto out; 943 } 944 if (vo->vo_levels == NULL) { 945 err = ENODEV; 946 goto out; 947 } 948 preset = (arg2 == POWER_PROFILE_ECONOMY) ? 949 &vo->vo_economy : &vo->vo_fullpower; 950 level = *preset; 951 err = sysctl_handle_int(oidp, &level, 0, req); 952 if (err != 0 || req->newptr == NULL) 953 goto out; 954 if (level < -1 || level > 100) { 955 err = EINVAL; 956 goto out; 957 } 958 if (level == -1) { 959 i = (arg2 == POWER_PROFILE_ECONOMY) ? 960 BCL_ECONOMY : BCL_FULLPOWER; 961 level = vo->vo_levels[i]; 962 } else if ((err = acpi_video_vo_check_level(vo, level)) != 0) 963 goto out; 964 965 if (vo->vo_brightness == -1 && (power_profile_get_state() == arg2)) 966 vo_set_brightness(vo, level); 967 *preset = level; 968 969 out: 970 ACPI_SERIAL_END(video_output); 971 return (err); 972 } 973 974 /* ARGSUSED */ 975 static int 976 acpi_video_vo_levels_sysctl(SYSCTL_HANDLER_ARGS) 977 { 978 struct acpi_video_output *vo; 979 int err; 980 981 vo = (struct acpi_video_output *)arg1; 982 ACPI_SERIAL_BEGIN(video_output); 983 if (vo->vo_levels == NULL) { 984 err = ENODEV; 985 goto out; 986 } 987 if (req->newptr != NULL) { 988 err = EPERM; 989 goto out; 990 } 991 err = sysctl_handle_opaque(oidp, vo->vo_levels, 992 vo->vo_numlevels * sizeof(*vo->vo_levels), req); 993 994 out: 995 ACPI_SERIAL_END(video_output); 996 return (err); 997 } 998 999 static void 1000 vid_set_switch_policy(ACPI_HANDLE handle, UINT32 policy) 1001 { 1002 ACPI_STATUS status; 1003 1004 status = acpi_SetInteger(handle, "_DOS", policy); 1005 if (ACPI_FAILURE(status)) 1006 printf("can't evaluate %s._DOS - %s\n", 1007 acpi_name(handle), AcpiFormatException(status)); 1008 } 1009 1010 struct enum_callback_arg { 1011 void (*callback)(ACPI_HANDLE, UINT32, void *); 1012 void *context; 1013 ACPI_OBJECT *dod_pkg; 1014 int count; 1015 }; 1016 1017 static ACPI_STATUS 1018 vid_enum_outputs_subr(ACPI_HANDLE handle, UINT32 level __unused, 1019 void *context, void **retp __unused) 1020 { 1021 ACPI_STATUS status; 1022 UINT32 adr, val; 1023 struct enum_callback_arg *argset; 1024 size_t i; 1025 1026 ACPI_SERIAL_ASSERT(video); 1027 argset = context; 1028 status = acpi_GetInteger(handle, "_ADR", &adr); 1029 if (ACPI_FAILURE(status)) 1030 return (AE_OK); 1031 1032 for (i = 0; i < argset->dod_pkg->Package.Count; i++) { 1033 if (acpi_PkgInt32(argset->dod_pkg, i, &val) == 0 && 1034 (val & DOD_DEVID_MASK_FULL) == 1035 (adr & DOD_DEVID_MASK_FULL)) { 1036 argset->callback(handle, val, argset->context); 1037 argset->count++; 1038 } 1039 } 1040 1041 return (AE_OK); 1042 } 1043 1044 static int 1045 vid_enum_outputs(ACPI_HANDLE handle, 1046 void (*callback)(ACPI_HANDLE, UINT32, void *), void *context) 1047 { 1048 ACPI_STATUS status; 1049 ACPI_BUFFER dod_buf; 1050 ACPI_OBJECT *res; 1051 struct enum_callback_arg argset; 1052 1053 ACPI_SERIAL_ASSERT(video); 1054 dod_buf.Length = ACPI_ALLOCATE_BUFFER; 1055 dod_buf.Pointer = NULL; 1056 status = AcpiEvaluateObject(handle, "_DOD", NULL, &dod_buf); 1057 if (ACPI_FAILURE(status)) { 1058 if (status != AE_NOT_FOUND) 1059 printf("can't evaluate %s._DOD - %s\n", 1060 acpi_name(handle), AcpiFormatException(status)); 1061 argset.count = -1; 1062 goto out; 1063 } 1064 res = (ACPI_OBJECT *)dod_buf.Pointer; 1065 if (!ACPI_PKG_VALID(res, 1)) { 1066 printf("evaluation of %s._DOD makes no sense\n", 1067 acpi_name(handle)); 1068 argset.count = -1; 1069 goto out; 1070 } 1071 if (callback == NULL) { 1072 argset.count = res->Package.Count; 1073 goto out; 1074 } 1075 argset.callback = callback; 1076 argset.context = context; 1077 argset.dod_pkg = res; 1078 argset.count = 0; 1079 status = AcpiWalkNamespace(ACPI_TYPE_DEVICE, handle, 1, 1080 vid_enum_outputs_subr, NULL, &argset, NULL); 1081 if (ACPI_FAILURE(status)) 1082 printf("failed walking down %s - %s\n", 1083 acpi_name(handle), AcpiFormatException(status)); 1084 out: 1085 if (dod_buf.Pointer != NULL) 1086 AcpiOsFree(dod_buf.Pointer); 1087 return (argset.count); 1088 } 1089 1090 static int 1091 vo_get_brightness_levels(ACPI_HANDLE handle, int **levelp) 1092 { 1093 ACPI_STATUS status; 1094 ACPI_BUFFER bcl_buf; 1095 ACPI_OBJECT *res; 1096 int num, i, n, *levels; 1097 1098 bcl_buf.Length = ACPI_ALLOCATE_BUFFER; 1099 bcl_buf.Pointer = NULL; 1100 status = AcpiEvaluateObject(handle, "_BCL", NULL, &bcl_buf); 1101 if (ACPI_FAILURE(status)) { 1102 if (status != AE_NOT_FOUND) 1103 printf("can't evaluate %s._BCL - %s\n", 1104 acpi_name(handle), AcpiFormatException(status)); 1105 goto out; 1106 } 1107 res = (ACPI_OBJECT *)bcl_buf.Pointer; 1108 if (!ACPI_PKG_VALID(res, 2)) { 1109 printf("evaluation of %s._BCL makes no sense\n", 1110 acpi_name(handle)); 1111 goto out; 1112 } 1113 num = res->Package.Count; 1114 if (num < 2 || levelp == NULL) 1115 goto out; 1116 levels = AcpiOsAllocate(num * sizeof(*levels)); 1117 if (levels == NULL) 1118 goto out; 1119 for (i = 0, n = 0; i < num; i++) 1120 if (acpi_PkgInt32(res, i, &levels[n]) == 0) 1121 n++; 1122 if (n < 2) { 1123 AcpiOsFree(levels); 1124 goto out; 1125 } 1126 *levelp = levels; 1127 return (n); 1128 1129 out: 1130 if (bcl_buf.Pointer != NULL) 1131 AcpiOsFree(bcl_buf.Pointer); 1132 return (0); 1133 } 1134 1135 static int 1136 vo_get_bqc(struct acpi_video_output *vo, UINT32 *level) 1137 { 1138 ACPI_STATUS status; 1139 1140 switch (vo->vo_hasbqc) { 1141 case 1: 1142 case -1: 1143 status = acpi_GetInteger(vo->handle, "_BQC", level); 1144 if (vo->vo_hasbqc == 1) 1145 break; 1146 vo->vo_hasbqc = status != AE_NOT_FOUND; 1147 if (vo->vo_hasbqc == 1) 1148 break; 1149 /* FALLTHROUGH */ 1150 default: 1151 KASSERT(vo->vo_hasbqc == 0, 1152 ("bad vo_hasbqc state %d", vo->vo_hasbqc)); 1153 *level = vo->vo_level; 1154 status = AE_OK; 1155 } 1156 return (status); 1157 } 1158 1159 static int 1160 vo_get_brightness(struct acpi_video_output *vo) 1161 { 1162 UINT32 level; 1163 ACPI_STATUS status; 1164 1165 ACPI_SERIAL_ASSERT(video_output); 1166 status = vo_get_bqc(vo, &level); 1167 if (ACPI_FAILURE(status)) { 1168 printf("can't evaluate %s._BQC - %s\n", acpi_name(vo->handle), 1169 AcpiFormatException(status)); 1170 return (-1); 1171 } 1172 if (level > 100) 1173 return (-1); 1174 1175 return (level); 1176 } 1177 1178 static void 1179 vo_set_brightness(struct acpi_video_output *vo, int level) 1180 { 1181 char notify_buf[16]; 1182 ACPI_STATUS status; 1183 1184 ACPI_SERIAL_ASSERT(video_output); 1185 status = acpi_SetInteger(vo->handle, "_BCM", level); 1186 if (ACPI_FAILURE(status)) { 1187 printf("can't evaluate %s._BCM - %s\n", 1188 acpi_name(vo->handle), AcpiFormatException(status)); 1189 } else { 1190 vo->vo_level = level; 1191 } 1192 snprintf(notify_buf, sizeof(notify_buf), "notify=%d", level); 1193 devctl_notify("ACPI", "Video", "brightness", notify_buf); 1194 } 1195 1196 static UINT32 1197 vo_get_device_status(ACPI_HANDLE handle) 1198 { 1199 UINT32 dcs; 1200 ACPI_STATUS status; 1201 1202 ACPI_SERIAL_ASSERT(video_output); 1203 dcs = 0; 1204 status = acpi_GetInteger(handle, "_DCS", &dcs); 1205 if (ACPI_FAILURE(status)) { 1206 /* 1207 * If the method is missing, assume that the device is always 1208 * operational. 1209 */ 1210 if (status != AE_NOT_FOUND) { 1211 printf("can't evaluate %s._DCS - %s\n", 1212 acpi_name(handle), AcpiFormatException(status)); 1213 } else { 1214 dcs = 0xff; 1215 } 1216 } 1217 1218 return (dcs); 1219 } 1220 1221 static UINT32 1222 vo_get_graphics_state(ACPI_HANDLE handle) 1223 { 1224 UINT32 dgs; 1225 ACPI_STATUS status; 1226 1227 dgs = 0; 1228 status = acpi_GetInteger(handle, "_DGS", &dgs); 1229 if (ACPI_FAILURE(status)) { 1230 /* 1231 * If the method is missing, assume that the device is always 1232 * operational. 1233 */ 1234 if (status != AE_NOT_FOUND) { 1235 printf("can't evaluate %s._DGS - %s\n", 1236 acpi_name(handle), AcpiFormatException(status)); 1237 } else { 1238 dgs = 0xff; 1239 } 1240 } 1241 1242 return (dgs); 1243 } 1244 1245 static void 1246 vo_set_device_state(ACPI_HANDLE handle, UINT32 state) 1247 { 1248 ACPI_STATUS status; 1249 1250 ACPI_SERIAL_ASSERT(video_output); 1251 status = acpi_SetInteger(handle, "_DSS", state); 1252 if (ACPI_FAILURE(status) && status != AE_NOT_FOUND) 1253 printf("can't evaluate %s._DSS - %s\n", 1254 acpi_name(handle), AcpiFormatException(status)); 1255 } 1256