acpi_wmi.c revision 202771
1/*- 2 * Copyright (c) 2009 Michael Gmelin <freebsd@grem.de> 3 * All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * 1. Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * 2. Redistributions in binary form must reproduce the above copyright 11 * notice, this list of conditions and the following disclaimer in the 12 * documentation and/or other materials provided with the distribution. 13 * 14 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 15 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 16 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 17 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 18 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 19 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 20 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 21 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 22 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 23 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 24 * SUCH DAMAGE. 25 */ 26 27#include <sys/cdefs.h> 28__FBSDID("$FreeBSD: head/sys/dev/acpi_support/acpi_wmi.c 202771 2010-01-21 21:14:28Z jkim $"); 29 30/* 31 * Driver for acpi-wmi mapping, provides an interface for vendor specific 32 * implementations (e.g. HP and Acer laptops). 33 * Inspired by the ACPI-WMI mapping driver (c) 2008-2008 Carlos Corbacho which 34 * implements this functionality for Linux. 35 * 36 * WMI and ACPI: http://www.microsoft.com/whdc/system/pnppwr/wmi/wmi-acpi.mspx 37 * acpi-wmi for Linux: http://www.kernel.org 38 */ 39 40#include "opt_acpi.h" 41#include <sys/param.h> 42#include <sys/conf.h> 43#include <sys/uio.h> 44#include <sys/proc.h> 45#include <sys/kernel.h> 46#include <sys/malloc.h> 47#include <sys/sbuf.h> 48#include <sys/module.h> 49#include <sys/bus.h> 50 51#include <contrib/dev/acpica/include/acpi.h> 52#include <contrib/dev/acpica/include/accommon.h> 53#include <dev/acpica/acpivar.h> 54#include "acpi_wmi_if.h" 55 56MALLOC_DEFINE(M_ACPIWMI, "acpiwmi", "ACPI-WMI mapping"); 57 58#define _COMPONENT ACPI_OEM 59ACPI_MODULE_NAME("ACPI_WMI"); 60 61#define ACPI_WMI_REGFLAG_EXPENSIVE 0x1 /* GUID flag: Expensive operation */ 62#define ACPI_WMI_REGFLAG_METHOD 0x2 /* GUID flag: Method call */ 63#define ACPI_WMI_REGFLAG_STRING 0x4 /* GUID flag: String */ 64#define ACPI_WMI_REGFLAG_EVENT 0x8 /* GUID flag: Event */ 65 66/* 67 * acpi_wmi driver private structure 68 */ 69struct acpi_wmi_softc { 70 device_t wmi_dev; /* wmi device id */ 71 ACPI_HANDLE wmi_handle; /* handle of the PNP0C14 node */ 72 device_t ec_dev; /* acpi_ec0 */ 73 struct cdev *wmistat_dev_t; /* wmistat device handle */ 74 struct sbuf wmistat_sbuf; /* sbuf for /dev/wmistat output */ 75 pid_t wmistat_open_pid; /* pid operating on /dev/wmistat */ 76 int wmistat_bufptr; /* /dev/wmistat ptr to buffer position */ 77}; 78 79/* 80 * Struct that holds information about 81 * about a single GUID entry in _WDG 82 */ 83struct guid_info { 84 char guid[16]; /* 16 byte non human readable GUID */ 85 char oid[2]; /* object id or event notify id (first byte) */ 86 UINT8 max_instance; /* highest instance known for this GUID */ 87 UINT8 flags; /* ACPI_WMI_REGFLAG_%s */ 88}; 89 90/* WExx event generation state (on/off) */ 91enum event_generation_state { 92 EVENT_GENERATION_ON = 1, 93 EVENT_GENERATION_OFF = 0 94}; 95 96 97/* 98 * Information about one entry in _WDG. 99 * List of those is used to lookup information by GUID. 100 */ 101struct wmi_info { 102 TAILQ_ENTRY(wmi_info) wmi_list; 103 struct guid_info ginfo; /* information on guid */ 104 ACPI_NOTIFY_HANDLER event_handler;/* client provided event handler */ 105 void *event_handler_user_data; /* ev handler cookie */ 106}; 107 108TAILQ_HEAD(wmi_info_list_head, wmi_info) 109 wmi_info_list = TAILQ_HEAD_INITIALIZER(wmi_info_list); 110 111ACPI_SERIAL_DECL(acpi_wmi, "ACPI-WMI Mapping"); 112 113/* public interface - declaration */ 114/* standard device interface*/ 115static int acpi_wmi_probe(device_t dev); 116static int acpi_wmi_attach(device_t dev); 117static int acpi_wmi_detach(device_t dev); 118/* see acpi_wmi_if.m */ 119static int acpi_wmi_provides_guid_string_method(device_t dev, 120 const char *guid_string); 121static ACPI_STATUS acpi_wmi_evaluate_call_method(device_t dev, 122 const char *guid_string, UINT8 instance, 123 UINT32 method_id, const ACPI_BUFFER *in, 124 ACPI_BUFFER *out); 125static ACPI_STATUS acpi_wmi_install_event_handler_method(device_t dev, 126 const char *guid_string, ACPI_NOTIFY_HANDLER handler, 127 void *data); 128static ACPI_STATUS acpi_wmi_remove_event_handler_method(device_t dev, 129 const char *guid_string); 130static ACPI_STATUS acpi_wmi_get_event_data_method(device_t dev, 131 UINT32 event_id, ACPI_BUFFER *out); 132static ACPI_STATUS acpi_wmi_get_block_method(device_t dev, 133 const char *guid_string, 134 UINT8 instance, ACPI_BUFFER *out); 135static ACPI_STATUS acpi_wmi_set_block_method(device_t dev, 136 const char *guid_string, 137 UINT8 instance, const ACPI_BUFFER *in); 138/* private interface - declaration */ 139/* callbacks */ 140static void acpi_wmi_notify_handler(ACPI_HANDLE h, UINT32 notify, 141 void *context); 142static ACPI_STATUS acpi_wmi_ec_handler(UINT32 function, 143 ACPI_PHYSICAL_ADDRESS address, UINT32 width, 144 UINT64 *value, void *context, 145 void *region_context); 146/* helpers */ 147static ACPI_STATUS acpi_wmi_read_wdg_blocks(ACPI_HANDLE h); 148static ACPI_STATUS acpi_wmi_toggle_we_event_generation(device_t dev, 149 struct wmi_info *winfo, 150 enum event_generation_state state); 151static int acpi_wmi_guid_string_to_guid(const UINT8 *guid_string, 152 UINT8 *guid); 153static struct wmi_info* acpi_wmi_lookup_wmi_info_by_guid_string( 154 const char *guid_string); 155 156static d_open_t acpi_wmi_wmistat_open; 157static d_close_t acpi_wmi_wmistat_close; 158static d_read_t acpi_wmi_wmistat_read; 159 160/* handler /dev/wmistat device */ 161static struct cdevsw wmistat_cdevsw = { 162 .d_version = D_VERSION, 163 .d_open = acpi_wmi_wmistat_open, 164 .d_close = acpi_wmi_wmistat_close, 165 .d_read = acpi_wmi_wmistat_read, 166 .d_name = "wmistat", 167}; 168 169 170static device_method_t acpi_wmi_methods[] = { 171 /* Device interface */ 172 DEVMETHOD(device_probe, acpi_wmi_probe), 173 DEVMETHOD(device_attach, acpi_wmi_attach), 174 DEVMETHOD(device_detach, acpi_wmi_detach), 175 176 /* acpi_wmi interface */ 177 DEVMETHOD(acpi_wmi_provides_guid_string, 178 acpi_wmi_provides_guid_string_method), 179 DEVMETHOD(acpi_wmi_evaluate_call, acpi_wmi_evaluate_call_method), 180 DEVMETHOD(acpi_wmi_install_event_handler, 181 acpi_wmi_install_event_handler_method), 182 DEVMETHOD(acpi_wmi_remove_event_handler, 183 acpi_wmi_remove_event_handler_method), 184 DEVMETHOD(acpi_wmi_get_event_data, acpi_wmi_get_event_data_method), 185 DEVMETHOD(acpi_wmi_get_block, acpi_wmi_get_block_method), 186 DEVMETHOD(acpi_wmi_set_block, acpi_wmi_set_block_method), 187 188 {0, 0} 189}; 190 191static driver_t acpi_wmi_driver = { 192 "acpi_wmi", 193 acpi_wmi_methods, 194 sizeof(struct acpi_wmi_softc), 195}; 196 197static devclass_t acpi_wmi_devclass; 198DRIVER_MODULE(acpi_wmi, acpi, acpi_wmi_driver, acpi_wmi_devclass, 0, 0); 199MODULE_VERSION(acpi_wmi, 1); 200MODULE_DEPEND(acpi_wmi, acpi, 1, 1, 1); 201static char *wmi_ids[] = {"PNP0C14", "PNP0c14", NULL}; 202 203/* 204 * Probe for the PNP0C14 ACPI node 205 */ 206static int 207acpi_wmi_probe(device_t dev) 208{ 209 if (acpi_disabled("wmi") || 210 ACPI_ID_PROBE(device_get_parent(dev), dev, wmi_ids) == NULL) 211 return (ENXIO); 212 device_set_desc(dev, "ACPI-WMI mapping"); 213 214 return (0); 215} 216 217/* 218 * Attach the device by: 219 * - Looking for the first ACPI EC device 220 * - Install the notify handler 221 * - Install the EC address space handler 222 * - Look for the _WDG node and read GUID information blocks 223 */ 224static int 225acpi_wmi_attach(device_t dev) 226{ 227 struct acpi_wmi_softc *sc; 228 int ret; 229 ACPI_STATUS status; 230 231 ACPI_FUNCTION_TRACE((char *)(uintptr_t)__func__); 232 sc = device_get_softc(dev); 233 ret = ENXIO; 234 235 ACPI_SERIAL_BEGIN(acpi_wmi); 236 sc->wmi_dev = dev; 237 sc->wmi_handle = acpi_get_handle(dev); 238 TAILQ_INIT(&wmi_info_list); 239 /* XXX Only works with one EC, but nearly all systems only have one. */ 240 if ((sc->ec_dev = devclass_get_device(devclass_find("acpi_ec"), 0)) 241 == NULL) 242 device_printf(dev, "cannot find EC device\n"); 243 else if (ACPI_FAILURE((status = AcpiInstallNotifyHandler(sc->wmi_handle, 244 ACPI_DEVICE_NOTIFY, acpi_wmi_notify_handler, sc)))) 245 device_printf(sc->wmi_dev, "couldn't install notify handler - %s\n", 246 AcpiFormatException(status)); 247 else if (ACPI_FAILURE((status = AcpiInstallAddressSpaceHandler( 248 sc->wmi_handle, ACPI_ADR_SPACE_EC, acpi_wmi_ec_handler, 249 NULL, sc)))) { 250 device_printf(sc->wmi_dev, "couldn't install EC handler - %s\n", 251 AcpiFormatException(status)); 252 AcpiRemoveNotifyHandler(sc->wmi_handle, ACPI_DEVICE_NOTIFY, 253 acpi_wmi_notify_handler); 254 } else if (ACPI_FAILURE((status = acpi_wmi_read_wdg_blocks( 255 sc->wmi_handle)))) { 256 device_printf(sc->wmi_dev, "couldn't parse _WDG - %s\n", 257 AcpiFormatException(status)); 258 AcpiRemoveNotifyHandler(sc->wmi_handle, ACPI_DEVICE_NOTIFY, 259 acpi_wmi_notify_handler); 260 AcpiRemoveAddressSpaceHandler(sc->wmi_handle, ACPI_ADR_SPACE_EC, 261 acpi_wmi_ec_handler); 262 } else { 263 sc->wmistat_dev_t = make_dev(&wmistat_cdevsw, 0, UID_ROOT, 264 GID_WHEEL, 0644, "wmistat"); 265 sc->wmistat_dev_t->si_drv1 = sc; 266 sc->wmistat_open_pid = 0; 267 sc->wmistat_bufptr = -1; 268 ret = 0; 269 } 270 ACPI_SERIAL_END(acpi_wmi); 271 272 return (ret); 273} 274 275/* 276 * Detach the driver by: 277 * - Removing notification handler 278 * - Removing address space handler 279 * - Turning off event generation for all WExx event activated by 280 * child drivers 281 */ 282static int 283acpi_wmi_detach(device_t dev) 284{ 285 struct wmi_info *winfo, *tmp; 286 struct acpi_wmi_softc *sc; 287 int ret; 288 289 ACPI_FUNCTION_TRACE((char *)(uintptr_t)__func__); 290 sc = device_get_softc(dev); 291 ACPI_SERIAL_BEGIN(acpi_wmi); 292 293 if (sc->wmistat_open_pid != 0) { 294 ret = EBUSY; 295 } else { 296 AcpiRemoveNotifyHandler(sc->wmi_handle, ACPI_DEVICE_NOTIFY, 297 acpi_wmi_notify_handler); 298 AcpiRemoveAddressSpaceHandler(sc->wmi_handle, 299 ACPI_ADR_SPACE_EC, acpi_wmi_ec_handler); 300 TAILQ_FOREACH_SAFE(winfo, &wmi_info_list, wmi_list, tmp) { 301 if (winfo->event_handler) 302 acpi_wmi_toggle_we_event_generation(dev, 303 winfo, EVENT_GENERATION_OFF); 304 TAILQ_REMOVE(&wmi_info_list, winfo, wmi_list); 305 free(winfo, M_ACPIWMI); 306 } 307 if (sc->wmistat_bufptr != -1) { 308 sbuf_delete(&sc->wmistat_sbuf); 309 sc->wmistat_bufptr = -1; 310 } 311 sc->wmistat_open_pid = 0; 312 destroy_dev(sc->wmistat_dev_t); 313 ret = 0; 314 } 315 ACPI_SERIAL_END(acpi_wmi); 316 317 return (ret); 318} 319 320 321/* 322 * Check if the given GUID string (human readable format 323 * AABBCCDD-EEFF-GGHH-IIJJ-KKLLMMNNOOPP) 324 * exists within _WDG 325 */ 326static int 327acpi_wmi_provides_guid_string_method(device_t dev, const char *guid_string) 328{ 329 struct wmi_info *winfo; 330 int ret; 331 332 ACPI_FUNCTION_TRACE((char *)(uintptr_t)__func__); 333 ACPI_SERIAL_BEGIN(acpi_wmi); 334 winfo = acpi_wmi_lookup_wmi_info_by_guid_string(guid_string); 335 ret = (winfo == NULL)?0:winfo->ginfo.max_instance+1; 336 ACPI_SERIAL_END(acpi_wmi); 337 338 return (ret); 339} 340 341/* 342 * Call a method "method_id" on the given GUID block 343 * write result into user provided output buffer 344 */ 345static ACPI_STATUS 346acpi_wmi_evaluate_call_method(device_t dev, const char *guid_string, 347 UINT8 instance, UINT32 method_id, const ACPI_BUFFER *in, ACPI_BUFFER *out) 348{ 349 ACPI_OBJECT params[3]; 350 ACPI_OBJECT_LIST input; 351 char method[5] = "WMxx"; 352 struct wmi_info *winfo; 353 struct acpi_wmi_softc *sc; 354 ACPI_STATUS status; 355 356 ACPI_FUNCTION_TRACE((char *)(uintptr_t)__func__); 357 358 sc = device_get_softc(dev); 359 ACPI_SERIAL_BEGIN(acpi_wmi); 360 if ((winfo = acpi_wmi_lookup_wmi_info_by_guid_string(guid_string)) 361 == NULL) 362 status = AE_NOT_FOUND; 363 else if (!(winfo->ginfo.flags & ACPI_WMI_REGFLAG_METHOD)) 364 status = AE_BAD_DATA; 365 else if (instance > winfo->ginfo.max_instance) 366 status = AE_BAD_PARAMETER; 367 else { 368 params[0].Type = ACPI_TYPE_INTEGER; 369 params[0].Integer.Value = instance; 370 params[1].Type = ACPI_TYPE_INTEGER; 371 params[1].Integer.Value = method_id; 372 input.Pointer = params; 373 input.Count = 2; 374 if (in) { 375 params[2].Type = 376 (winfo->ginfo.flags & ACPI_WMI_REGFLAG_STRING) 377 ?ACPI_TYPE_STRING:ACPI_TYPE_BUFFER; 378 params[2].Buffer.Length = in->Length; 379 params[2].Buffer.Pointer = in->Pointer; 380 input.Count = 3; 381 } 382 method[2] = winfo->ginfo.oid[0]; 383 method[3] = winfo->ginfo.oid[1]; 384 status = AcpiEvaluateObject(sc->wmi_handle, method, 385 &input, out); 386 } 387 ACPI_SERIAL_END(acpi_wmi); 388 389 return (status); 390} 391 392/* 393 * Install a user provided event_handler on the given GUID 394 * provided *data will be passed on callback 395 * If there is already an existing event handler registered it will be silently 396 * discarded 397 */ 398static ACPI_STATUS 399acpi_wmi_install_event_handler_method(device_t dev, const char *guid_string, 400 ACPI_NOTIFY_HANDLER event_handler, void *data) 401{ 402 struct wmi_info *winfo; 403 ACPI_STATUS status; 404 405 ACPI_FUNCTION_TRACE((char *)(uintptr_t)__func__); 406 407 status = AE_OK; 408 ACPI_SERIAL_BEGIN(acpi_wmi); 409 if (guid_string == NULL || event_handler == NULL) 410 status = AE_BAD_PARAMETER; 411 else if ((winfo = acpi_wmi_lookup_wmi_info_by_guid_string(guid_string)) 412 == NULL) 413 status = AE_NOT_EXIST; 414 else if (winfo->event_handler != NULL || 415 (status = acpi_wmi_toggle_we_event_generation(dev, winfo, 416 EVENT_GENERATION_ON)) == AE_OK) { 417 winfo->event_handler = event_handler; 418 winfo->event_handler_user_data = data; 419 } 420 ACPI_SERIAL_END(acpi_wmi); 421 422 return (status); 423} 424 425/* 426 * Remove a previously installed event handler from the given GUID 427 * If there was none installed, this call is silently discarded and 428 * reported as AE_OK 429 */ 430static ACPI_STATUS 431acpi_wmi_remove_event_handler_method(device_t dev, const char *guid_string) 432{ 433 struct wmi_info *winfo; 434 ACPI_STATUS status; 435 436 ACPI_FUNCTION_TRACE((char *)(uintptr_t)__func__); 437 438 status = AE_OK; 439 ACPI_SERIAL_BEGIN(acpi_wmi); 440 if (guid_string && 441 (winfo = acpi_wmi_lookup_wmi_info_by_guid_string(guid_string)) 442 != NULL && winfo->event_handler) { 443 status = acpi_wmi_toggle_we_event_generation(dev, winfo, 444 EVENT_GENERATION_OFF); 445 winfo->event_handler = NULL; 446 winfo->event_handler_user_data = NULL; 447 } 448 ACPI_SERIAL_END(acpi_wmi); 449 450 return (status); 451} 452 453/* 454 * Get details on an event received through a callback registered 455 * through ACPI_WMI_REMOVE_EVENT_HANDLER into a user provided output buffer. 456 * (event_id equals "notify" passed in the callback) 457 */ 458static ACPI_STATUS 459acpi_wmi_get_event_data_method(device_t dev, UINT32 event_id, ACPI_BUFFER *out) 460{ 461 ACPI_OBJECT_LIST input; 462 ACPI_OBJECT params[1]; 463 struct acpi_wmi_softc *sc; 464 struct wmi_info *winfo; 465 ACPI_STATUS status; 466 467 ACPI_FUNCTION_TRACE((char *)(uintptr_t)__func__); 468 469 sc = device_get_softc(dev); 470 status = AE_NOT_FOUND; 471 ACPI_SERIAL_BEGIN(acpi_wmi); 472 params[0].Type = ACPI_TYPE_INTEGER; 473 params[0].Integer.Value = event_id; 474 input.Pointer = params; 475 input.Count = 1; 476 TAILQ_FOREACH(winfo, &wmi_info_list, wmi_list) { 477 if ((winfo->ginfo.flags & ACPI_WMI_REGFLAG_EVENT) && 478 ((UINT8) winfo->ginfo.oid[0] == event_id)) { 479 status = AcpiEvaluateObject(sc->wmi_handle, "_WED", 480 &input, out); 481 break; 482 } 483 } 484 ACPI_SERIAL_END(acpi_wmi); 485 486 return (status); 487} 488 489/* 490 * Read a block of data from the given GUID (using WQxx (query)) 491 * Will be returned in a user provided buffer (out). 492 * If the method is marked as expensive (ACPI_WMI_REGFLAG_EXPENSIVE) 493 * we will first call the WCxx control method to lock the node to 494 * lock the node for data collection and release it afterwards. 495 * (Failed WCxx calls are ignored to "support" broken implementations) 496 */ 497static ACPI_STATUS 498acpi_wmi_get_block_method(device_t dev, const char *guid_string, UINT8 instance, 499 ACPI_BUFFER *out) 500{ 501 char wc_method[5] = "WCxx"; 502 char wq_method[5] = "WQxx"; 503 ACPI_OBJECT_LIST wc_input; 504 ACPI_OBJECT_LIST wq_input; 505 ACPI_OBJECT wc_params[1]; 506 ACPI_OBJECT wq_params[1]; 507 ACPI_HANDLE wc_handle; 508 struct acpi_wmi_softc *sc; 509 struct wmi_info *winfo; 510 ACPI_STATUS status; 511 ACPI_STATUS wc_status; 512 513 ACPI_FUNCTION_TRACE((char *)(uintptr_t)__func__); 514 515 sc = device_get_softc(dev); 516 wc_status = AE_ERROR; 517 ACPI_SERIAL_BEGIN(acpi_wmi); 518 if (guid_string == NULL || out == NULL) 519 status = AE_BAD_PARAMETER; 520 else if ((winfo = acpi_wmi_lookup_wmi_info_by_guid_string(guid_string)) 521 == NULL) 522 status = AE_ERROR; 523 else if (instance > winfo->ginfo.max_instance) 524 status = AE_BAD_PARAMETER; 525 else if ((winfo->ginfo.flags & ACPI_WMI_REGFLAG_EVENT) || 526 (winfo->ginfo.flags & ACPI_WMI_REGFLAG_METHOD)) 527 status = AE_ERROR; 528 else { 529 wq_params[0].Type = ACPI_TYPE_INTEGER; 530 wq_params[0].Integer.Value = instance; 531 wq_input.Pointer = wq_params; 532 wq_input.Count = 1; 533 if (winfo->ginfo.flags & ACPI_WMI_REGFLAG_EXPENSIVE) { 534 wc_params[0].Type = ACPI_TYPE_INTEGER; 535 wc_params[0].Integer.Value = 1; 536 wc_input.Pointer = wc_params; 537 wc_input.Count = 1; 538 wc_method[2] = winfo->ginfo.oid[0]; 539 wc_method[3] = winfo->ginfo.oid[1]; 540 wc_status = AcpiGetHandle(sc->wmi_handle, wc_method, 541 &wc_handle); 542 if (ACPI_SUCCESS(wc_status)) 543 wc_status = AcpiEvaluateObject(wc_handle, 544 wc_method, &wc_input, NULL); 545 } 546 wq_method[2] = winfo->ginfo.oid[0]; 547 wq_method[3] = winfo->ginfo.oid[1]; 548 status = AcpiEvaluateObject(sc->wmi_handle, wq_method, 549 &wq_input, out); 550 if ((winfo->ginfo.flags & ACPI_WMI_REGFLAG_EXPENSIVE) 551 && ACPI_SUCCESS(wc_status)) { 552 wc_params[0].Integer.Value = 0; 553 status = AcpiEvaluateObject(wc_handle, wc_method, 554 &wc_input, NULL); /* XXX this might be 555 the wrong status to 556 return? */ 557 } 558 } 559 ACPI_SERIAL_END(acpi_wmi); 560 561 return (status); 562} 563 564/* 565 * Write a block of data to the given GUID (using WSxx) 566 */ 567static ACPI_STATUS 568acpi_wmi_set_block_method(device_t dev, const char *guid_string, UINT8 instance, 569 const ACPI_BUFFER *in) 570{ 571 char method[5] = "WSxx"; 572 ACPI_OBJECT_LIST input; 573 ACPI_OBJECT params[2]; 574 struct wmi_info *winfo; 575 struct acpi_wmi_softc *sc; 576 ACPI_STATUS status; 577 578 ACPI_FUNCTION_TRACE((char *)(uintptr_t)__func__); 579 580 sc = device_get_softc(dev); 581 ACPI_SERIAL_BEGIN(acpi_wmi); 582 if (guid_string == NULL || in == NULL) 583 status = AE_BAD_DATA; 584 else if ((winfo = acpi_wmi_lookup_wmi_info_by_guid_string(guid_string)) 585 == NULL) 586 status = AE_ERROR; 587 else if (instance > winfo->ginfo.max_instance) 588 status = AE_BAD_PARAMETER; 589 else if ((winfo->ginfo.flags & ACPI_WMI_REGFLAG_EVENT) || 590 (winfo->ginfo.flags & ACPI_WMI_REGFLAG_METHOD)) 591 status = AE_ERROR; 592 else { 593 params[0].Type = ACPI_TYPE_INTEGER; 594 params[0].Integer.Value = instance; 595 input.Pointer = params; 596 input.Count = 2; 597 params[1].Type = (winfo->ginfo.flags & ACPI_WMI_REGFLAG_STRING) 598 ?ACPI_TYPE_STRING:ACPI_TYPE_BUFFER; 599 params[1].Buffer.Length = in->Length; 600 params[1].Buffer.Pointer = in->Pointer; 601 method[2] = winfo->ginfo.oid[0]; 602 method[3] = winfo->ginfo.oid[1]; 603 status = AcpiEvaluateObject(sc->wmi_handle, method, 604 &input, NULL); 605 } 606 ACPI_SERIAL_END(acpi_wmi); 607 608 return (status); 609} 610 611/* 612 * Handle events received and dispatch them to 613 * stakeholders that registered through ACPI_WMI_INSTALL_EVENT_HANDLER 614 */ 615static void 616acpi_wmi_notify_handler(ACPI_HANDLE h, UINT32 notify, void *context) 617{ 618 ACPI_NOTIFY_HANDLER handler; 619 void *handler_data; 620 struct wmi_info *winfo; 621 622 ACPI_FUNCTION_TRACE_U32((char *)(uintptr_t)__func__, notify); 623 624 handler = NULL; 625 handler_data = NULL; 626 ACPI_SERIAL_BEGIN(acpi_wmi); 627 TAILQ_FOREACH(winfo, &wmi_info_list, wmi_list) { 628 if ((winfo->ginfo.flags & ACPI_WMI_REGFLAG_EVENT) && 629 ((UINT8) winfo->ginfo.oid[0] == notify)) { 630 if (winfo->event_handler) { 631 handler = winfo->event_handler; 632 handler_data = winfo->event_handler_user_data; 633 break; 634 } 635 } 636 } 637 ACPI_SERIAL_END(acpi_wmi); 638 if (handler) { 639 handler(h, notify, handler_data); 640 } 641} 642 643/* 644 * Handle EC address space notifications reveived on the WDG node 645 * (this mimics EcAddressSpaceHandler in acpi_ec.c) 646 */ 647static ACPI_STATUS 648acpi_wmi_ec_handler(UINT32 function, ACPI_PHYSICAL_ADDRESS address, 649 UINT32 width, UINT64 *value, void *context, 650 void *region_context) 651{ 652 struct acpi_wmi_softc *sc; 653 int i; 654 UINT64 ec_data; 655 UINT8 ec_addr; 656 ACPI_STATUS status; 657 658 ACPI_FUNCTION_TRACE_U32((char *)(uintptr_t)__func__, (UINT32)address); 659 660 sc = (struct acpi_wmi_softc *)context; 661 if (width % 8 != 0 || value == NULL || context == NULL) 662 return (AE_BAD_PARAMETER); 663 if (address + (width / 8) - 1 > 0xFF) 664 return (AE_BAD_ADDRESS); 665 if (function == ACPI_READ) 666 *value = 0; 667 ec_addr = address; 668 status = AE_ERROR; 669 670 for (i = 0; i < width; i += 8, ++ec_addr) { 671 switch (function) { 672 case ACPI_READ: 673 status = ACPI_EC_READ(sc->ec_dev, ec_addr, &ec_data, 1); 674 if (ACPI_SUCCESS(status)) 675 *value |= ((UINT64)ec_data) << i; 676 break; 677 case ACPI_WRITE: 678 ec_data = (UINT8)((*value) >> i); 679 status = ACPI_EC_WRITE(sc->ec_dev, ec_addr, ec_data, 1); 680 break; 681 default: 682 device_printf(sc->wmi_dev, 683 "invalid acpi_wmi_ec_handler function %d\n", 684 function); 685 status = AE_BAD_PARAMETER; 686 break; 687 } 688 if (ACPI_FAILURE(status)) 689 break; 690 } 691 692 return (status); 693} 694 695/* 696 * Read GUID blocks from the _WDG node 697 * into wmi_info_list. 698 */ 699static ACPI_STATUS 700acpi_wmi_read_wdg_blocks(ACPI_HANDLE h) 701{ 702 ACPI_BUFFER out = {ACPI_ALLOCATE_BUFFER, NULL}; 703 struct guid_info *ginfo; 704 ACPI_OBJECT *obj; 705 struct wmi_info *winfo; 706 UINT32 i; 707 UINT32 wdg_block_count; 708 ACPI_STATUS status; 709 710 ACPI_FUNCTION_TRACE((char *)(uintptr_t)__func__); 711 712 ACPI_SERIAL_ASSERT(acpi_wmi); 713 if (ACPI_FAILURE(status = AcpiEvaluateObject(h, "_WDG", NULL, &out))) 714 return (status); 715 obj = (ACPI_OBJECT*) out.Pointer; 716 wdg_block_count = obj->Buffer.Length / sizeof(struct guid_info); 717 if ((ginfo = malloc(obj->Buffer.Length, M_ACPIWMI, M_NOWAIT)) 718 == NULL) { 719 AcpiOsFree(out.Pointer); 720 return (AE_NO_MEMORY); 721 } 722 memcpy(ginfo, obj->Buffer.Pointer, obj->Buffer.Length); 723 for (i = 0; i < wdg_block_count; ++i) { 724 if ((winfo = malloc(sizeof(struct wmi_info), M_ACPIWMI, 725 M_NOWAIT | M_ZERO)) == NULL) { 726 AcpiOsFree(out.Pointer); 727 free(ginfo, M_ACPIWMI); 728 return (AE_NO_MEMORY); 729 } 730 winfo->ginfo = ginfo[i]; 731 TAILQ_INSERT_TAIL(&wmi_info_list, winfo, wmi_list); 732 } 733 AcpiOsFree(out.Pointer); 734 free(ginfo, M_ACPIWMI); 735 736 return (status); 737} 738 739/* 740 * Toggle event generation in for the given GUID (passed by winfo) 741 * Turn on to get notified (through acpi_wmi_notify_handler) if events happen 742 * on the given GUID. 743 */ 744static ACPI_STATUS 745acpi_wmi_toggle_we_event_generation(device_t dev, struct wmi_info *winfo, 746 enum event_generation_state state) 747{ 748 char method[5] = "WExx"; 749 ACPI_OBJECT_LIST input; 750 ACPI_OBJECT params[1]; 751 struct acpi_wmi_softc *sc; 752 ACPI_STATUS status; 753 754 ACPI_FUNCTION_TRACE((char *)(uintptr_t)__func__); 755 756 sc = device_get_softc(dev); 757 ACPI_SERIAL_ASSERT(acpi_wmi); 758 params[0].Type = ACPI_TYPE_INTEGER; 759 params[0].Integer.Value = state==EVENT_GENERATION_ON?1:0; 760 input.Pointer = params; 761 input.Count = 1; 762 763 UINT8 hi = ((UINT8) winfo->ginfo.oid[0]) >> 4; 764 UINT8 lo = ((UINT8) winfo->ginfo.oid[0]) & 0xf; 765 method[2] = (hi > 9 ? hi + 55: hi + 48); 766 method[3] = (lo > 9 ? lo + 55: lo + 48); 767 status = AcpiEvaluateObject(sc->wmi_handle, method, &input, NULL); 768 if (status == AE_NOT_FOUND) status = AE_OK; 769 770 return (status); 771} 772 773/* 774 * Convert given two digit hex string (hexin) to an UINT8 referenced 775 * by byteout. 776 * Return != 0 if the was a problem (invalid input) 777 */ 778static __inline int acpi_wmi_hex_to_int(const UINT8 *hexin, UINT8 *byteout) 779{ 780 unsigned int hi; 781 unsigned int lo; 782 783 hi = hexin[0]; 784 lo = hexin[1]; 785 if ('0' <= hi && hi <= '9') 786 hi -= '0'; 787 else if ('A' <= hi && hi <= 'F') 788 hi -= ('A' - 10); 789 else if ('a' <= hi && hi <= 'f') 790 hi -= ('a' - 10); 791 else 792 return (1); 793 if ('0' <= lo && lo <= '9') 794 lo -= '0'; 795 else if ('A' <= lo && lo <= 'F') 796 lo -= ('A' - 10); 797 else if ('a' <= lo && lo <= 'f') 798 lo -= ('a' - 10); 799 else 800 return (1); 801 *byteout = (hi << 4) + lo; 802 803 return (0); 804} 805 806/* 807 * Convert a human readable 36 character GUID into a 16byte 808 * machine readable one. 809 * The basic algorithm looks as follows: 810 * Input: AABBCCDD-EEFF-GGHH-IIJJ-KKLLMMNNOOPP 811 * Output: DCBAFEHGIJKLMNOP 812 * (AA BB CC etc. represent two digit hex numbers == bytes) 813 * Return != 0 if passed guid string is invalid 814 */ 815static int 816acpi_wmi_guid_string_to_guid(const UINT8 *guid_string, UINT8 *guid) 817{ 818 static const int mapping[20] = {3, 2, 1, 0, -1, 5, 4, -1, 7, 6, -1, 819 8, 9, -1, 10, 11, 12, 13, 14, 15}; 820 int i; 821 822 for (i = 0; i < 20; ++i, ++guid_string) { 823 if (mapping[i] >= 0) { 824 if (acpi_wmi_hex_to_int(guid_string, 825 &guid[mapping[i]])) 826 return (-1); 827 ++guid_string; 828 } else if (*guid_string != '-') 829 return (-1); 830 } 831 832 return (0); 833} 834 835/* 836 * Lookup a wmi_info structure in wmi_list based on a 837 * human readable GUID 838 * Return NULL if the GUID is unknown in the _WDG 839 */ 840static struct wmi_info* 841acpi_wmi_lookup_wmi_info_by_guid_string(const char *guid_string) 842{ 843 char guid[16]; 844 struct wmi_info *winfo; 845 846 ACPI_FUNCTION_TRACE((char *)(uintptr_t)__func__); 847 848 ACPI_SERIAL_ASSERT(acpi_wmi); 849 850 if (!acpi_wmi_guid_string_to_guid(guid_string, guid)) { 851 TAILQ_FOREACH(winfo, &wmi_info_list, wmi_list) { 852 if (!memcmp(winfo->ginfo.guid, guid, 16)) { 853 return (winfo); 854 } 855 } 856 } 857 858 return (NULL); 859} 860 861/* 862 * open wmistat device 863 */ 864static int 865acpi_wmi_wmistat_open(struct cdev* dev, int flags, int mode, struct thread *td) 866{ 867 struct acpi_wmi_softc *sc; 868 int ret; 869 870 if (dev == NULL || dev->si_drv1 == NULL) 871 return (EBADF); 872 sc = dev->si_drv1; 873 874 ACPI_SERIAL_BEGIN(acpi_wmi); 875 if (sc->wmistat_open_pid != 0) { 876 ret = EBUSY; 877 } 878 else { 879 if (sbuf_new(&sc->wmistat_sbuf, NULL, 4096, SBUF_AUTOEXTEND) 880 == NULL) { 881 ret = ENXIO; 882 } else { 883 sc->wmistat_open_pid = td->td_proc->p_pid; 884 sc->wmistat_bufptr = 0; 885 ret = 0; 886 } 887 } 888 ACPI_SERIAL_END(acpi_wmi); 889 890 return (ret); 891} 892 893/* 894 * close wmistat device 895 */ 896static int 897acpi_wmi_wmistat_close(struct cdev* dev, int flags, int mode, 898 struct thread *td) 899{ 900 struct acpi_wmi_softc *sc; 901 int ret; 902 903 if (dev == NULL || dev->si_drv1 == NULL) 904 return (EBADF); 905 sc = dev->si_drv1; 906 907 ACPI_SERIAL_BEGIN(acpi_wmi); 908 if (sc->wmistat_open_pid == 0) { 909 ret = EBADF; 910 } 911 else { 912 if (sc->wmistat_bufptr != -1) { 913 sbuf_delete(&sc->wmistat_sbuf); 914 sc->wmistat_bufptr = -1; 915 } 916 sc->wmistat_open_pid = 0; 917 ret = 0; 918 } 919 ACPI_SERIAL_END(acpi_wmi); 920 921 return (ret); 922} 923 924/* 925 * Read from wmistat guid information 926 */ 927static int 928acpi_wmi_wmistat_read(struct cdev *dev, struct uio *buf, int flag) 929{ 930 struct acpi_wmi_softc *sc; 931 struct wmi_info *winfo; 932 int l; 933 int ret; 934 UINT8* guid; 935 936 if (dev == NULL || dev->si_drv1 == NULL) 937 return (EBADF); 938 sc = dev->si_drv1; 939 940 ACPI_SERIAL_BEGIN(acpi_wmi); 941 if (sc->wmistat_open_pid != buf->uio_td->td_proc->p_pid || 942 sc->wmistat_bufptr == -1) { 943 ret = EBADF; 944 } 945 else { 946 if (!sbuf_done(&sc->wmistat_sbuf)) { 947 sbuf_printf(&sc->wmistat_sbuf, "GUID " 948 " INST EXPE METH STR " 949 "EVENT OID\n"); 950 TAILQ_FOREACH(winfo, &wmi_info_list, wmi_list) { 951 guid = (UINT8*)winfo->ginfo.guid; 952 sbuf_printf(&sc->wmistat_sbuf, 953 "{%02X%02X%02X%02X-%02X%02X-" 954 "%02X%02X-%02X%02X-%02X%02X" 955 "%02X%02X%02X%02X} %3d %-5s", 956 guid[3], guid[2], guid[1], guid[0], 957 guid[5], guid[4], 958 guid[7], guid[6], 959 guid[8], guid[9], 960 guid[10], guid[11], guid[12], 961 guid[13], guid[14], guid[15], 962 winfo->ginfo.max_instance, 963 (winfo->ginfo.flags& 964 ACPI_WMI_REGFLAG_EXPENSIVE)? 965 "YES":"NO" 966 ); 967 if (winfo->ginfo.flags&ACPI_WMI_REGFLAG_METHOD) 968 sbuf_printf(&sc->wmistat_sbuf, 969 "WM%c%c ", 970 winfo->ginfo.oid[0], 971 winfo->ginfo.oid[1]); 972 else 973 sbuf_printf(&sc->wmistat_sbuf, "NO "); 974 sbuf_printf(&sc->wmistat_sbuf, "%-4s", 975 (winfo->ginfo.flags& 976 ACPI_WMI_REGFLAG_STRING)?"YES":"NO" 977 ); 978 if (winfo->ginfo.flags&ACPI_WMI_REGFLAG_EVENT) 979 sbuf_printf(&sc->wmistat_sbuf, 980 "0x%02X%s -\n", 981 (UINT8)winfo->ginfo.oid[0], 982 winfo->event_handler==NULL? 983 " ":"+"); 984 else 985 sbuf_printf(&sc->wmistat_sbuf, 986 "NO %c%c\n", 987 winfo->ginfo.oid[0], 988 winfo->ginfo.oid[1]); 989 } 990 sbuf_finish(&sc->wmistat_sbuf); 991 } 992 if (sbuf_len(&sc->wmistat_sbuf) <= 0) { 993 sbuf_delete(&sc->wmistat_sbuf); 994 sc->wmistat_bufptr = -1; 995 sc->wmistat_open_pid = 0; 996 ret = ENOMEM; 997 } else { 998 l = min(buf->uio_resid, sbuf_len(&sc->wmistat_sbuf) - 999 sc->wmistat_bufptr); 1000 ret = (l > 0)?uiomove(sbuf_data(&sc->wmistat_sbuf) + 1001 sc->wmistat_bufptr, l, buf) : 0; 1002 sc->wmistat_bufptr += l; 1003 } 1004 } 1005 ACPI_SERIAL_END(acpi_wmi); 1006 1007 return (ret); 1008} 1009