1 /* 2 * acpi_bus.c - ACPI Bus Driver ($Revision: 80 $) 3 * 4 * Copyright (C) 2001, 2002 Paul Diefenbaugh <paul.s.diefenbaugh@intel.com> 5 * 6 * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ 7 * 8 * This program is free software; you can redistribute it and/or modify 9 * it under the terms of the GNU General Public License as published by 10 * the Free Software Foundation; either version 2 of the License, or (at 11 * your option) any later version. 12 * 13 * This program is distributed in the hope that it will be useful, but 14 * WITHOUT ANY WARRANTY; without even the implied warranty of 15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 16 * General Public License for more details. 17 * 18 * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ 19 */ 20 21 #include <linux/module.h> 22 #include <linux/init.h> 23 #include <linux/ioport.h> 24 #include <linux/kernel.h> 25 #include <linux/list.h> 26 #include <linux/sched.h> 27 #include <linux/pm.h> 28 #include <linux/device.h> 29 #include <linux/proc_fs.h> 30 #include <linux/acpi.h> 31 #include <linux/slab.h> 32 #include <linux/regulator/machine.h> 33 #ifdef CONFIG_X86 34 #include <asm/mpspec.h> 35 #endif 36 #include <linux/pci.h> 37 #include <acpi/apei.h> 38 #include <linux/dmi.h> 39 #include <linux/suspend.h> 40 41 #include "internal.h" 42 43 #define _COMPONENT ACPI_BUS_COMPONENT 44 ACPI_MODULE_NAME("bus"); 45 46 struct acpi_device *acpi_root; 47 struct proc_dir_entry *acpi_root_dir; 48 EXPORT_SYMBOL(acpi_root_dir); 49 50 #ifdef CONFIG_X86 51 #ifdef CONFIG_ACPI_CUSTOM_DSDT 52 static inline int set_copy_dsdt(const struct dmi_system_id *id) 53 { 54 return 0; 55 } 56 #else 57 static int set_copy_dsdt(const struct dmi_system_id *id) 58 { 59 printk(KERN_NOTICE "%s detected - " 60 "force copy of DSDT to local memory\n", id->ident); 61 acpi_gbl_copy_dsdt_locally = 1; 62 return 0; 63 } 64 #endif 65 66 static struct dmi_system_id dsdt_dmi_table[] __initdata = { 67 /* 68 * Invoke DSDT corruption work-around on all Toshiba Satellite. 69 * https://bugzilla.kernel.org/show_bug.cgi?id=14679 70 */ 71 { 72 .callback = set_copy_dsdt, 73 .ident = "TOSHIBA Satellite", 74 .matches = { 75 DMI_MATCH(DMI_SYS_VENDOR, "TOSHIBA"), 76 DMI_MATCH(DMI_PRODUCT_NAME, "Satellite"), 77 }, 78 }, 79 {} 80 }; 81 #else 82 static struct dmi_system_id dsdt_dmi_table[] __initdata = { 83 {} 84 }; 85 #endif 86 87 /* -------------------------------------------------------------------------- 88 Device Management 89 -------------------------------------------------------------------------- */ 90 91 acpi_status acpi_bus_get_status_handle(acpi_handle handle, 92 unsigned long long *sta) 93 { 94 acpi_status status; 95 96 status = acpi_evaluate_integer(handle, "_STA", NULL, sta); 97 if (ACPI_SUCCESS(status)) 98 return AE_OK; 99 100 if (status == AE_NOT_FOUND) { 101 *sta = ACPI_STA_DEVICE_PRESENT | ACPI_STA_DEVICE_ENABLED | 102 ACPI_STA_DEVICE_UI | ACPI_STA_DEVICE_FUNCTIONING; 103 return AE_OK; 104 } 105 return status; 106 } 107 108 int acpi_bus_get_status(struct acpi_device *device) 109 { 110 acpi_status status; 111 unsigned long long sta; 112 113 status = acpi_bus_get_status_handle(device->handle, &sta); 114 if (ACPI_FAILURE(status)) 115 return -ENODEV; 116 117 acpi_set_device_status(device, sta); 118 119 if (device->status.functional && !device->status.present) { 120 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Device [%s] status [%08x]: " 121 "functional but not present;\n", 122 device->pnp.bus_id, (u32)sta)); 123 } 124 125 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Device [%s] status [%08x]\n", 126 device->pnp.bus_id, (u32)sta)); 127 return 0; 128 } 129 EXPORT_SYMBOL(acpi_bus_get_status); 130 131 void acpi_bus_private_data_handler(acpi_handle handle, 132 void *context) 133 { 134 return; 135 } 136 EXPORT_SYMBOL(acpi_bus_private_data_handler); 137 138 int acpi_bus_attach_private_data(acpi_handle handle, void *data) 139 { 140 acpi_status status; 141 142 status = acpi_attach_data(handle, 143 acpi_bus_private_data_handler, data); 144 if (ACPI_FAILURE(status)) { 145 acpi_handle_debug(handle, "Error attaching device data\n"); 146 return -ENODEV; 147 } 148 149 return 0; 150 } 151 EXPORT_SYMBOL_GPL(acpi_bus_attach_private_data); 152 153 int acpi_bus_get_private_data(acpi_handle handle, void **data) 154 { 155 acpi_status status; 156 157 if (!*data) 158 return -EINVAL; 159 160 status = acpi_get_data(handle, acpi_bus_private_data_handler, data); 161 if (ACPI_FAILURE(status)) { 162 acpi_handle_debug(handle, "No context for object\n"); 163 return -ENODEV; 164 } 165 166 return 0; 167 } 168 EXPORT_SYMBOL_GPL(acpi_bus_get_private_data); 169 170 void acpi_bus_detach_private_data(acpi_handle handle) 171 { 172 acpi_detach_data(handle, acpi_bus_private_data_handler); 173 } 174 EXPORT_SYMBOL_GPL(acpi_bus_detach_private_data); 175 176 static void acpi_print_osc_error(acpi_handle handle, 177 struct acpi_osc_context *context, char *error) 178 { 179 struct acpi_buffer buffer = {ACPI_ALLOCATE_BUFFER}; 180 int i; 181 182 if (ACPI_FAILURE(acpi_get_name(handle, ACPI_FULL_PATHNAME, &buffer))) 183 printk(KERN_DEBUG "%s: %s\n", context->uuid_str, error); 184 else { 185 printk(KERN_DEBUG "%s (%s): %s\n", 186 (char *)buffer.pointer, context->uuid_str, error); 187 kfree(buffer.pointer); 188 } 189 printk(KERN_DEBUG "_OSC request data:"); 190 for (i = 0; i < context->cap.length; i += sizeof(u32)) 191 printk(" %x", *((u32 *)(context->cap.pointer + i))); 192 printk("\n"); 193 } 194 195 acpi_status acpi_str_to_uuid(char *str, u8 *uuid) 196 { 197 int i; 198 static int opc_map_to_uuid[16] = {6, 4, 2, 0, 11, 9, 16, 14, 19, 21, 199 24, 26, 28, 30, 32, 34}; 200 201 if (strlen(str) != 36) 202 return AE_BAD_PARAMETER; 203 for (i = 0; i < 36; i++) { 204 if (i == 8 || i == 13 || i == 18 || i == 23) { 205 if (str[i] != '-') 206 return AE_BAD_PARAMETER; 207 } else if (!isxdigit(str[i])) 208 return AE_BAD_PARAMETER; 209 } 210 for (i = 0; i < 16; i++) { 211 uuid[i] = hex_to_bin(str[opc_map_to_uuid[i]]) << 4; 212 uuid[i] |= hex_to_bin(str[opc_map_to_uuid[i] + 1]); 213 } 214 return AE_OK; 215 } 216 EXPORT_SYMBOL_GPL(acpi_str_to_uuid); 217 218 acpi_status acpi_run_osc(acpi_handle handle, struct acpi_osc_context *context) 219 { 220 acpi_status status; 221 struct acpi_object_list input; 222 union acpi_object in_params[4]; 223 union acpi_object *out_obj; 224 u8 uuid[16]; 225 u32 errors; 226 struct acpi_buffer output = {ACPI_ALLOCATE_BUFFER, NULL}; 227 228 if (!context) 229 return AE_ERROR; 230 if (ACPI_FAILURE(acpi_str_to_uuid(context->uuid_str, uuid))) 231 return AE_ERROR; 232 context->ret.length = ACPI_ALLOCATE_BUFFER; 233 context->ret.pointer = NULL; 234 235 /* Setting up input parameters */ 236 input.count = 4; 237 input.pointer = in_params; 238 in_params[0].type = ACPI_TYPE_BUFFER; 239 in_params[0].buffer.length = 16; 240 in_params[0].buffer.pointer = uuid; 241 in_params[1].type = ACPI_TYPE_INTEGER; 242 in_params[1].integer.value = context->rev; 243 in_params[2].type = ACPI_TYPE_INTEGER; 244 in_params[2].integer.value = context->cap.length/sizeof(u32); 245 in_params[3].type = ACPI_TYPE_BUFFER; 246 in_params[3].buffer.length = context->cap.length; 247 in_params[3].buffer.pointer = context->cap.pointer; 248 249 status = acpi_evaluate_object(handle, "_OSC", &input, &output); 250 if (ACPI_FAILURE(status)) 251 return status; 252 253 if (!output.length) 254 return AE_NULL_OBJECT; 255 256 out_obj = output.pointer; 257 if (out_obj->type != ACPI_TYPE_BUFFER 258 || out_obj->buffer.length != context->cap.length) { 259 acpi_print_osc_error(handle, context, 260 "_OSC evaluation returned wrong type"); 261 status = AE_TYPE; 262 goto out_kfree; 263 } 264 /* Need to ignore the bit0 in result code */ 265 errors = *((u32 *)out_obj->buffer.pointer) & ~(1 << 0); 266 if (errors) { 267 if (errors & OSC_REQUEST_ERROR) 268 acpi_print_osc_error(handle, context, 269 "_OSC request failed"); 270 if (errors & OSC_INVALID_UUID_ERROR) 271 acpi_print_osc_error(handle, context, 272 "_OSC invalid UUID"); 273 if (errors & OSC_INVALID_REVISION_ERROR) 274 acpi_print_osc_error(handle, context, 275 "_OSC invalid revision"); 276 if (errors & OSC_CAPABILITIES_MASK_ERROR) { 277 if (((u32 *)context->cap.pointer)[OSC_QUERY_DWORD] 278 & OSC_QUERY_ENABLE) 279 goto out_success; 280 status = AE_SUPPORT; 281 goto out_kfree; 282 } 283 status = AE_ERROR; 284 goto out_kfree; 285 } 286 out_success: 287 context->ret.length = out_obj->buffer.length; 288 context->ret.pointer = kmemdup(out_obj->buffer.pointer, 289 context->ret.length, GFP_KERNEL); 290 if (!context->ret.pointer) { 291 status = AE_NO_MEMORY; 292 goto out_kfree; 293 } 294 status = AE_OK; 295 296 out_kfree: 297 kfree(output.pointer); 298 if (status != AE_OK) 299 context->ret.pointer = NULL; 300 return status; 301 } 302 EXPORT_SYMBOL(acpi_run_osc); 303 304 bool osc_sb_apei_support_acked; 305 static u8 sb_uuid_str[] = "0811B06E-4A27-44F9-8D60-3CBBC22E7B48"; 306 static void acpi_bus_osc_support(void) 307 { 308 u32 capbuf[2]; 309 struct acpi_osc_context context = { 310 .uuid_str = sb_uuid_str, 311 .rev = 1, 312 .cap.length = 8, 313 .cap.pointer = capbuf, 314 }; 315 acpi_handle handle; 316 317 capbuf[OSC_QUERY_DWORD] = OSC_QUERY_ENABLE; 318 capbuf[OSC_SUPPORT_DWORD] = OSC_SB_PR3_SUPPORT; /* _PR3 is in use */ 319 if (IS_ENABLED(CONFIG_ACPI_PROCESSOR_AGGREGATOR)) 320 capbuf[OSC_SUPPORT_DWORD] |= OSC_SB_PAD_SUPPORT; 321 if (IS_ENABLED(CONFIG_ACPI_PROCESSOR)) 322 capbuf[OSC_SUPPORT_DWORD] |= OSC_SB_PPC_OST_SUPPORT; 323 324 capbuf[OSC_SUPPORT_DWORD] |= OSC_SB_HOTPLUG_OST_SUPPORT; 325 326 if (!ghes_disable) 327 capbuf[OSC_SUPPORT_DWORD] |= OSC_SB_APEI_SUPPORT; 328 if (ACPI_FAILURE(acpi_get_handle(NULL, "\\_SB", &handle))) 329 return; 330 if (ACPI_SUCCESS(acpi_run_osc(handle, &context))) { 331 u32 *capbuf_ret = context.ret.pointer; 332 if (context.ret.length > OSC_SUPPORT_DWORD) 333 osc_sb_apei_support_acked = 334 capbuf_ret[OSC_SUPPORT_DWORD] & OSC_SB_APEI_SUPPORT; 335 kfree(context.ret.pointer); 336 } 337 /* do we need to check other returned cap? Sounds no */ 338 } 339 340 /* -------------------------------------------------------------------------- 341 Notification Handling 342 -------------------------------------------------------------------------- */ 343 344 /** 345 * acpi_bus_notify 346 * --------------- 347 * Callback for all 'system-level' device notifications (values 0x00-0x7F). 348 */ 349 static void acpi_bus_notify(acpi_handle handle, u32 type, void *data) 350 { 351 struct acpi_device *adev; 352 struct acpi_driver *driver; 353 u32 ost_code = ACPI_OST_SC_NON_SPECIFIC_FAILURE; 354 bool hotplug_event = false; 355 356 switch (type) { 357 case ACPI_NOTIFY_BUS_CHECK: 358 acpi_handle_debug(handle, "ACPI_NOTIFY_BUS_CHECK event\n"); 359 hotplug_event = true; 360 break; 361 362 case ACPI_NOTIFY_DEVICE_CHECK: 363 acpi_handle_debug(handle, "ACPI_NOTIFY_DEVICE_CHECK event\n"); 364 hotplug_event = true; 365 break; 366 367 case ACPI_NOTIFY_DEVICE_WAKE: 368 acpi_handle_debug(handle, "ACPI_NOTIFY_DEVICE_WAKE event\n"); 369 break; 370 371 case ACPI_NOTIFY_EJECT_REQUEST: 372 acpi_handle_debug(handle, "ACPI_NOTIFY_EJECT_REQUEST event\n"); 373 hotplug_event = true; 374 break; 375 376 case ACPI_NOTIFY_DEVICE_CHECK_LIGHT: 377 acpi_handle_debug(handle, "ACPI_NOTIFY_DEVICE_CHECK_LIGHT event\n"); 378 /* TBD: Exactly what does 'light' mean? */ 379 break; 380 381 case ACPI_NOTIFY_FREQUENCY_MISMATCH: 382 acpi_handle_err(handle, "Device cannot be configured due " 383 "to a frequency mismatch\n"); 384 break; 385 386 case ACPI_NOTIFY_BUS_MODE_MISMATCH: 387 acpi_handle_err(handle, "Device cannot be configured due " 388 "to a bus mode mismatch\n"); 389 break; 390 391 case ACPI_NOTIFY_POWER_FAULT: 392 acpi_handle_err(handle, "Device has suffered a power fault\n"); 393 break; 394 395 default: 396 acpi_handle_debug(handle, "Unknown event type 0x%x\n", type); 397 break; 398 } 399 400 adev = acpi_bus_get_acpi_device(handle); 401 if (!adev) 402 goto err; 403 404 driver = adev->driver; 405 if (driver && driver->ops.notify && 406 (driver->flags & ACPI_DRIVER_ALL_NOTIFY_EVENTS)) 407 driver->ops.notify(adev, type); 408 409 if (hotplug_event && ACPI_SUCCESS(acpi_hotplug_schedule(adev, type))) 410 return; 411 412 acpi_bus_put_acpi_device(adev); 413 return; 414 415 err: 416 acpi_evaluate_ost(handle, type, ost_code, NULL); 417 } 418 419 static void acpi_device_notify(acpi_handle handle, u32 event, void *data) 420 { 421 struct acpi_device *device = data; 422 423 device->driver->ops.notify(device, event); 424 } 425 426 static void acpi_device_notify_fixed(void *data) 427 { 428 struct acpi_device *device = data; 429 430 /* Fixed hardware devices have no handles */ 431 acpi_device_notify(NULL, ACPI_FIXED_HARDWARE_EVENT, device); 432 } 433 434 static u32 acpi_device_fixed_event(void *data) 435 { 436 acpi_os_execute(OSL_NOTIFY_HANDLER, acpi_device_notify_fixed, data); 437 return ACPI_INTERRUPT_HANDLED; 438 } 439 440 static int acpi_device_install_notify_handler(struct acpi_device *device) 441 { 442 acpi_status status; 443 444 if (device->device_type == ACPI_BUS_TYPE_POWER_BUTTON) 445 status = 446 acpi_install_fixed_event_handler(ACPI_EVENT_POWER_BUTTON, 447 acpi_device_fixed_event, 448 device); 449 else if (device->device_type == ACPI_BUS_TYPE_SLEEP_BUTTON) 450 status = 451 acpi_install_fixed_event_handler(ACPI_EVENT_SLEEP_BUTTON, 452 acpi_device_fixed_event, 453 device); 454 else 455 status = acpi_install_notify_handler(device->handle, 456 ACPI_DEVICE_NOTIFY, 457 acpi_device_notify, 458 device); 459 460 if (ACPI_FAILURE(status)) 461 return -EINVAL; 462 return 0; 463 } 464 465 static void acpi_device_remove_notify_handler(struct acpi_device *device) 466 { 467 if (device->device_type == ACPI_BUS_TYPE_POWER_BUTTON) 468 acpi_remove_fixed_event_handler(ACPI_EVENT_POWER_BUTTON, 469 acpi_device_fixed_event); 470 else if (device->device_type == ACPI_BUS_TYPE_SLEEP_BUTTON) 471 acpi_remove_fixed_event_handler(ACPI_EVENT_SLEEP_BUTTON, 472 acpi_device_fixed_event); 473 else 474 acpi_remove_notify_handler(device->handle, ACPI_DEVICE_NOTIFY, 475 acpi_device_notify); 476 } 477 478 /* -------------------------------------------------------------------------- 479 Device Matching 480 -------------------------------------------------------------------------- */ 481 482 static struct acpi_device *acpi_primary_dev_companion(struct acpi_device *adev, 483 const struct device *dev) 484 { 485 struct mutex *physical_node_lock = &adev->physical_node_lock; 486 487 mutex_lock(physical_node_lock); 488 if (list_empty(&adev->physical_node_list)) { 489 adev = NULL; 490 } else { 491 const struct acpi_device_physical_node *node; 492 493 node = list_first_entry(&adev->physical_node_list, 494 struct acpi_device_physical_node, node); 495 if (node->dev != dev) 496 adev = NULL; 497 } 498 mutex_unlock(physical_node_lock); 499 return adev; 500 } 501 502 /** 503 * acpi_device_is_first_physical_node - Is given dev first physical node 504 * @adev: ACPI companion device 505 * @dev: Physical device to check 506 * 507 * Function checks if given @dev is the first physical devices attached to 508 * the ACPI companion device. This distinction is needed in some cases 509 * where the same companion device is shared between many physical devices. 510 * 511 * Note that the caller have to provide valid @adev pointer. 512 */ 513 bool acpi_device_is_first_physical_node(struct acpi_device *adev, 514 const struct device *dev) 515 { 516 return !!acpi_primary_dev_companion(adev, dev); 517 } 518 519 /* 520 * acpi_companion_match() - Can we match via ACPI companion device 521 * @dev: Device in question 522 * 523 * Check if the given device has an ACPI companion and if that companion has 524 * a valid list of PNP IDs, and if the device is the first (primary) physical 525 * device associated with it. Return the companion pointer if that's the case 526 * or NULL otherwise. 527 * 528 * If multiple physical devices are attached to a single ACPI companion, we need 529 * to be careful. The usage scenario for this kind of relationship is that all 530 * of the physical devices in question use resources provided by the ACPI 531 * companion. A typical case is an MFD device where all the sub-devices share 532 * the parent's ACPI companion. In such cases we can only allow the primary 533 * (first) physical device to be matched with the help of the companion's PNP 534 * IDs. 535 * 536 * Additional physical devices sharing the ACPI companion can still use 537 * resources available from it but they will be matched normally using functions 538 * provided by their bus types (and analogously for their modalias). 539 */ 540 struct acpi_device *acpi_companion_match(const struct device *dev) 541 { 542 struct acpi_device *adev; 543 544 adev = ACPI_COMPANION(dev); 545 if (!adev) 546 return NULL; 547 548 if (list_empty(&adev->pnp.ids)) 549 return NULL; 550 551 return acpi_primary_dev_companion(adev, dev); 552 } 553 554 /** 555 * acpi_of_match_device - Match device object using the "compatible" property. 556 * @adev: ACPI device object to match. 557 * @of_match_table: List of device IDs to match against. 558 * 559 * If @dev has an ACPI companion which has ACPI_DT_NAMESPACE_HID in its list of 560 * identifiers and a _DSD object with the "compatible" property, use that 561 * property to match against the given list of identifiers. 562 */ 563 static bool acpi_of_match_device(struct acpi_device *adev, 564 const struct of_device_id *of_match_table) 565 { 566 const union acpi_object *of_compatible, *obj; 567 int i, nval; 568 569 if (!adev) 570 return false; 571 572 of_compatible = adev->data.of_compatible; 573 if (!of_match_table || !of_compatible) 574 return false; 575 576 if (of_compatible->type == ACPI_TYPE_PACKAGE) { 577 nval = of_compatible->package.count; 578 obj = of_compatible->package.elements; 579 } else { /* Must be ACPI_TYPE_STRING. */ 580 nval = 1; 581 obj = of_compatible; 582 } 583 /* Now we can look for the driver DT compatible strings */ 584 for (i = 0; i < nval; i++, obj++) { 585 const struct of_device_id *id; 586 587 for (id = of_match_table; id->compatible[0]; id++) 588 if (!strcasecmp(obj->string.pointer, id->compatible)) 589 return true; 590 } 591 592 return false; 593 } 594 595 static bool __acpi_match_device_cls(const struct acpi_device_id *id, 596 struct acpi_hardware_id *hwid) 597 { 598 int i, msk, byte_shift; 599 char buf[3]; 600 601 if (!id->cls) 602 return false; 603 604 /* Apply class-code bitmask, before checking each class-code byte */ 605 for (i = 1; i <= 3; i++) { 606 byte_shift = 8 * (3 - i); 607 msk = (id->cls_msk >> byte_shift) & 0xFF; 608 if (!msk) 609 continue; 610 611 sprintf(buf, "%02x", (id->cls >> byte_shift) & msk); 612 if (strncmp(buf, &hwid->id[(i - 1) * 2], 2)) 613 return false; 614 } 615 return true; 616 } 617 618 static const struct acpi_device_id *__acpi_match_device( 619 struct acpi_device *device, 620 const struct acpi_device_id *ids, 621 const struct of_device_id *of_ids) 622 { 623 const struct acpi_device_id *id; 624 struct acpi_hardware_id *hwid; 625 626 /* 627 * If the device is not present, it is unnecessary to load device 628 * driver for it. 629 */ 630 if (!device || !device->status.present) 631 return NULL; 632 633 list_for_each_entry(hwid, &device->pnp.ids, list) { 634 /* First, check the ACPI/PNP IDs provided by the caller. */ 635 for (id = ids; id->id[0] || id->cls; id++) { 636 if (id->id[0] && !strcmp((char *) id->id, hwid->id)) 637 return id; 638 else if (id->cls && __acpi_match_device_cls(id, hwid)) 639 return id; 640 } 641 642 /* 643 * Next, check ACPI_DT_NAMESPACE_HID and try to match the 644 * "compatible" property if found. 645 * 646 * The id returned by the below is not valid, but the only 647 * caller passing non-NULL of_ids here is only interested in 648 * whether or not the return value is NULL. 649 */ 650 if (!strcmp(ACPI_DT_NAMESPACE_HID, hwid->id) 651 && acpi_of_match_device(device, of_ids)) 652 return id; 653 } 654 return NULL; 655 } 656 657 /** 658 * acpi_match_device - Match a struct device against a given list of ACPI IDs 659 * @ids: Array of struct acpi_device_id object to match against. 660 * @dev: The device structure to match. 661 * 662 * Check if @dev has a valid ACPI handle and if there is a struct acpi_device 663 * object for that handle and use that object to match against a given list of 664 * device IDs. 665 * 666 * Return a pointer to the first matching ID on success or %NULL on failure. 667 */ 668 const struct acpi_device_id *acpi_match_device(const struct acpi_device_id *ids, 669 const struct device *dev) 670 { 671 return __acpi_match_device(acpi_companion_match(dev), ids, NULL); 672 } 673 EXPORT_SYMBOL_GPL(acpi_match_device); 674 675 int acpi_match_device_ids(struct acpi_device *device, 676 const struct acpi_device_id *ids) 677 { 678 return __acpi_match_device(device, ids, NULL) ? 0 : -ENOENT; 679 } 680 EXPORT_SYMBOL(acpi_match_device_ids); 681 682 bool acpi_driver_match_device(struct device *dev, 683 const struct device_driver *drv) 684 { 685 if (!drv->acpi_match_table) 686 return acpi_of_match_device(ACPI_COMPANION(dev), 687 drv->of_match_table); 688 689 return !!__acpi_match_device(acpi_companion_match(dev), 690 drv->acpi_match_table, drv->of_match_table); 691 } 692 EXPORT_SYMBOL_GPL(acpi_driver_match_device); 693 694 /* -------------------------------------------------------------------------- 695 ACPI Driver Management 696 -------------------------------------------------------------------------- */ 697 698 /** 699 * acpi_bus_register_driver - register a driver with the ACPI bus 700 * @driver: driver being registered 701 * 702 * Registers a driver with the ACPI bus. Searches the namespace for all 703 * devices that match the driver's criteria and binds. Returns zero for 704 * success or a negative error status for failure. 705 */ 706 int acpi_bus_register_driver(struct acpi_driver *driver) 707 { 708 int ret; 709 710 if (acpi_disabled) 711 return -ENODEV; 712 driver->drv.name = driver->name; 713 driver->drv.bus = &acpi_bus_type; 714 driver->drv.owner = driver->owner; 715 716 ret = driver_register(&driver->drv); 717 return ret; 718 } 719 720 EXPORT_SYMBOL(acpi_bus_register_driver); 721 722 /** 723 * acpi_bus_unregister_driver - unregisters a driver with the ACPI bus 724 * @driver: driver to unregister 725 * 726 * Unregisters a driver with the ACPI bus. Searches the namespace for all 727 * devices that match the driver's criteria and unbinds. 728 */ 729 void acpi_bus_unregister_driver(struct acpi_driver *driver) 730 { 731 driver_unregister(&driver->drv); 732 } 733 734 EXPORT_SYMBOL(acpi_bus_unregister_driver); 735 736 /* -------------------------------------------------------------------------- 737 ACPI Bus operations 738 -------------------------------------------------------------------------- */ 739 740 static int acpi_bus_match(struct device *dev, struct device_driver *drv) 741 { 742 struct acpi_device *acpi_dev = to_acpi_device(dev); 743 struct acpi_driver *acpi_drv = to_acpi_driver(drv); 744 745 return acpi_dev->flags.match_driver 746 && !acpi_match_device_ids(acpi_dev, acpi_drv->ids); 747 } 748 749 static int acpi_device_uevent(struct device *dev, struct kobj_uevent_env *env) 750 { 751 return __acpi_device_uevent_modalias(to_acpi_device(dev), env); 752 } 753 754 static int acpi_device_probe(struct device *dev) 755 { 756 struct acpi_device *acpi_dev = to_acpi_device(dev); 757 struct acpi_driver *acpi_drv = to_acpi_driver(dev->driver); 758 int ret; 759 760 if (acpi_dev->handler && !acpi_is_pnp_device(acpi_dev)) 761 return -EINVAL; 762 763 if (!acpi_drv->ops.add) 764 return -ENOSYS; 765 766 ret = acpi_drv->ops.add(acpi_dev); 767 if (ret) 768 return ret; 769 770 acpi_dev->driver = acpi_drv; 771 ACPI_DEBUG_PRINT((ACPI_DB_INFO, 772 "Driver [%s] successfully bound to device [%s]\n", 773 acpi_drv->name, acpi_dev->pnp.bus_id)); 774 775 if (acpi_drv->ops.notify) { 776 ret = acpi_device_install_notify_handler(acpi_dev); 777 if (ret) { 778 if (acpi_drv->ops.remove) 779 acpi_drv->ops.remove(acpi_dev); 780 781 acpi_dev->driver = NULL; 782 acpi_dev->driver_data = NULL; 783 return ret; 784 } 785 } 786 787 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found driver [%s] for device [%s]\n", 788 acpi_drv->name, acpi_dev->pnp.bus_id)); 789 get_device(dev); 790 return 0; 791 } 792 793 static int acpi_device_remove(struct device * dev) 794 { 795 struct acpi_device *acpi_dev = to_acpi_device(dev); 796 struct acpi_driver *acpi_drv = acpi_dev->driver; 797 798 if (acpi_drv) { 799 if (acpi_drv->ops.notify) 800 acpi_device_remove_notify_handler(acpi_dev); 801 if (acpi_drv->ops.remove) 802 acpi_drv->ops.remove(acpi_dev); 803 } 804 acpi_dev->driver = NULL; 805 acpi_dev->driver_data = NULL; 806 807 put_device(dev); 808 return 0; 809 } 810 811 struct bus_type acpi_bus_type = { 812 .name = "acpi", 813 .match = acpi_bus_match, 814 .probe = acpi_device_probe, 815 .remove = acpi_device_remove, 816 .uevent = acpi_device_uevent, 817 }; 818 819 /* -------------------------------------------------------------------------- 820 Initialization/Cleanup 821 -------------------------------------------------------------------------- */ 822 823 static int __init acpi_bus_init_irq(void) 824 { 825 acpi_status status; 826 char *message = NULL; 827 828 829 /* 830 * Let the system know what interrupt model we are using by 831 * evaluating the \_PIC object, if exists. 832 */ 833 834 switch (acpi_irq_model) { 835 case ACPI_IRQ_MODEL_PIC: 836 message = "PIC"; 837 break; 838 case ACPI_IRQ_MODEL_IOAPIC: 839 message = "IOAPIC"; 840 break; 841 case ACPI_IRQ_MODEL_IOSAPIC: 842 message = "IOSAPIC"; 843 break; 844 case ACPI_IRQ_MODEL_GIC: 845 message = "GIC"; 846 break; 847 case ACPI_IRQ_MODEL_PLATFORM: 848 message = "platform specific model"; 849 break; 850 default: 851 printk(KERN_WARNING PREFIX "Unknown interrupt routing model\n"); 852 return -ENODEV; 853 } 854 855 printk(KERN_INFO PREFIX "Using %s for interrupt routing\n", message); 856 857 status = acpi_execute_simple_method(NULL, "\\_PIC", acpi_irq_model); 858 if (ACPI_FAILURE(status) && (status != AE_NOT_FOUND)) { 859 ACPI_EXCEPTION((AE_INFO, status, "Evaluating _PIC")); 860 return -ENODEV; 861 } 862 863 return 0; 864 } 865 866 /** 867 * acpi_early_init - Initialize ACPICA and populate the ACPI namespace. 868 * 869 * The ACPI tables are accessible after this, but the handling of events has not 870 * been initialized and the global lock is not available yet, so AML should not 871 * be executed at this point. 872 * 873 * Doing this before switching the EFI runtime services to virtual mode allows 874 * the EfiBootServices memory to be freed slightly earlier on boot. 875 */ 876 void __init acpi_early_init(void) 877 { 878 acpi_status status; 879 880 if (acpi_disabled) 881 return; 882 883 printk(KERN_INFO PREFIX "Core revision %08x\n", ACPI_CA_VERSION); 884 885 /* It's safe to verify table checksums during late stage */ 886 acpi_gbl_verify_table_checksum = TRUE; 887 888 /* enable workarounds, unless strict ACPI spec. compliance */ 889 if (!acpi_strict) 890 acpi_gbl_enable_interpreter_slack = TRUE; 891 892 acpi_gbl_permanent_mmap = 1; 893 894 /* 895 * If the machine falls into the DMI check table, 896 * DSDT will be copied to memory 897 */ 898 dmi_check_system(dsdt_dmi_table); 899 900 status = acpi_reallocate_root_table(); 901 if (ACPI_FAILURE(status)) { 902 printk(KERN_ERR PREFIX 903 "Unable to reallocate ACPI tables\n"); 904 goto error0; 905 } 906 907 status = acpi_initialize_subsystem(); 908 if (ACPI_FAILURE(status)) { 909 printk(KERN_ERR PREFIX 910 "Unable to initialize the ACPI Interpreter\n"); 911 goto error0; 912 } 913 914 status = acpi_load_tables(); 915 if (ACPI_FAILURE(status)) { 916 printk(KERN_ERR PREFIX 917 "Unable to load the System Description Tables\n"); 918 goto error0; 919 } 920 921 #ifdef CONFIG_X86 922 if (!acpi_ioapic) { 923 /* compatible (0) means level (3) */ 924 if (!(acpi_sci_flags & ACPI_MADT_TRIGGER_MASK)) { 925 acpi_sci_flags &= ~ACPI_MADT_TRIGGER_MASK; 926 acpi_sci_flags |= ACPI_MADT_TRIGGER_LEVEL; 927 } 928 /* Set PIC-mode SCI trigger type */ 929 acpi_pic_sci_set_trigger(acpi_gbl_FADT.sci_interrupt, 930 (acpi_sci_flags & ACPI_MADT_TRIGGER_MASK) >> 2); 931 } else { 932 /* 933 * now that acpi_gbl_FADT is initialized, 934 * update it with result from INT_SRC_OVR parsing 935 */ 936 acpi_gbl_FADT.sci_interrupt = acpi_sci_override_gsi; 937 } 938 #endif 939 return; 940 941 error0: 942 disable_acpi(); 943 } 944 945 /** 946 * acpi_subsystem_init - Finalize the early initialization of ACPI. 947 * 948 * Switch over the platform to the ACPI mode (if possible), initialize the 949 * handling of ACPI events, install the interrupt and global lock handlers. 950 * 951 * Doing this too early is generally unsafe, but at the same time it needs to be 952 * done before all things that really depend on ACPI. The right spot appears to 953 * be before finalizing the EFI initialization. 954 */ 955 void __init acpi_subsystem_init(void) 956 { 957 acpi_status status; 958 959 if (acpi_disabled) 960 return; 961 962 status = acpi_enable_subsystem(~ACPI_NO_ACPI_ENABLE); 963 if (ACPI_FAILURE(status)) { 964 printk(KERN_ERR PREFIX "Unable to enable ACPI\n"); 965 disable_acpi(); 966 } else { 967 /* 968 * If the system is using ACPI then we can be reasonably 969 * confident that any regulators are managed by the firmware 970 * so tell the regulator core it has everything it needs to 971 * know. 972 */ 973 regulator_has_full_constraints(); 974 } 975 } 976 977 static int __init acpi_bus_init(void) 978 { 979 int result; 980 acpi_status status; 981 982 acpi_os_initialize1(); 983 984 status = acpi_enable_subsystem(ACPI_NO_ACPI_ENABLE); 985 if (ACPI_FAILURE(status)) { 986 printk(KERN_ERR PREFIX 987 "Unable to start the ACPI Interpreter\n"); 988 goto error1; 989 } 990 991 /* 992 * ACPI 2.0 requires the EC driver to be loaded and work before 993 * the EC device is found in the namespace (i.e. before acpi_initialize_objects() 994 * is called). 995 * 996 * This is accomplished by looking for the ECDT table, and getting 997 * the EC parameters out of that. 998 */ 999 status = acpi_ec_ecdt_probe(); 1000 /* Ignore result. Not having an ECDT is not fatal. */ 1001 1002 status = acpi_initialize_objects(ACPI_FULL_INITIALIZATION); 1003 if (ACPI_FAILURE(status)) { 1004 printk(KERN_ERR PREFIX "Unable to initialize ACPI objects\n"); 1005 goto error1; 1006 } 1007 1008 /* 1009 * _OSC method may exist in module level code, 1010 * so it must be run after ACPI_FULL_INITIALIZATION 1011 */ 1012 acpi_bus_osc_support(); 1013 1014 /* 1015 * _PDC control method may load dynamic SSDT tables, 1016 * and we need to install the table handler before that. 1017 */ 1018 acpi_sysfs_init(); 1019 1020 acpi_early_processor_set_pdc(); 1021 1022 /* 1023 * Maybe EC region is required at bus_scan/acpi_get_devices. So it 1024 * is necessary to enable it as early as possible. 1025 */ 1026 acpi_boot_ec_enable(); 1027 1028 printk(KERN_INFO PREFIX "Interpreter enabled\n"); 1029 1030 /* Initialize sleep structures */ 1031 acpi_sleep_init(); 1032 1033 /* 1034 * Get the system interrupt model and evaluate \_PIC. 1035 */ 1036 result = acpi_bus_init_irq(); 1037 if (result) 1038 goto error1; 1039 1040 /* 1041 * Register the for all standard device notifications. 1042 */ 1043 status = 1044 acpi_install_notify_handler(ACPI_ROOT_OBJECT, ACPI_SYSTEM_NOTIFY, 1045 &acpi_bus_notify, NULL); 1046 if (ACPI_FAILURE(status)) { 1047 printk(KERN_ERR PREFIX 1048 "Unable to register for device notifications\n"); 1049 goto error1; 1050 } 1051 1052 /* 1053 * Create the top ACPI proc directory 1054 */ 1055 acpi_root_dir = proc_mkdir(ACPI_BUS_FILE_ROOT, NULL); 1056 1057 result = bus_register(&acpi_bus_type); 1058 if (!result) 1059 return 0; 1060 1061 /* Mimic structured exception handling */ 1062 error1: 1063 acpi_terminate(); 1064 return -ENODEV; 1065 } 1066 1067 struct kobject *acpi_kobj; 1068 EXPORT_SYMBOL_GPL(acpi_kobj); 1069 1070 static int __init acpi_init(void) 1071 { 1072 int result; 1073 1074 if (acpi_disabled) { 1075 printk(KERN_INFO PREFIX "Interpreter disabled.\n"); 1076 return -ENODEV; 1077 } 1078 1079 acpi_kobj = kobject_create_and_add("acpi", firmware_kobj); 1080 if (!acpi_kobj) { 1081 printk(KERN_WARNING "%s: kset create error\n", __func__); 1082 acpi_kobj = NULL; 1083 } 1084 1085 init_acpi_device_notify(); 1086 result = acpi_bus_init(); 1087 if (result) { 1088 disable_acpi(); 1089 return result; 1090 } 1091 1092 pci_mmcfg_late_init(); 1093 acpi_scan_init(); 1094 acpi_ec_init(); 1095 acpi_debugfs_init(); 1096 acpi_sleep_proc_init(); 1097 acpi_wakeup_device_init(); 1098 acpi_debugger_init(); 1099 return 0; 1100 } 1101 1102 subsys_initcall(acpi_init); 1103