1// SPDX-License-Identifier: GPL-2.0-or-later 2/* 3 * acpi_bus.c - ACPI Bus Driver ($Revision: 80 $) 4 * 5 * Copyright (C) 2001, 2002 Paul Diefenbaugh <paul.s.diefenbaugh@intel.com> 6 */ 7 8#include <linux/module.h> 9#include <linux/init.h> 10#include <linux/ioport.h> 11#include <linux/kernel.h> 12#include <linux/list.h> 13#include <linux/sched.h> 14#include <linux/pm.h> 15#include <linux/device.h> 16#include <linux/proc_fs.h> 17#include <linux/acpi.h> 18#include <linux/slab.h> 19#include <linux/regulator/machine.h> 20#include <linux/workqueue.h> 21#include <linux/reboot.h> 22#include <linux/delay.h> 23#ifdef CONFIG_X86 24#include <asm/mpspec.h> 25#include <linux/dmi.h> 26#endif 27#include <linux/acpi_iort.h> 28#include <linux/pci.h> 29#include <acpi/apei.h> 30#include <linux/suspend.h> 31 32#include "internal.h" 33 34#define _COMPONENT ACPI_BUS_COMPONENT 35ACPI_MODULE_NAME("bus"); 36 37struct acpi_device *acpi_root; 38struct proc_dir_entry *acpi_root_dir; 39EXPORT_SYMBOL(acpi_root_dir); 40 41#ifdef CONFIG_X86 42#ifdef CONFIG_ACPI_CUSTOM_DSDT 43static inline int set_copy_dsdt(const struct dmi_system_id *id) 44{ 45 return 0; 46} 47#else 48static int set_copy_dsdt(const struct dmi_system_id *id) 49{ 50 printk(KERN_NOTICE "%s detected - " 51 "force copy of DSDT to local memory\n", id->ident); 52 acpi_gbl_copy_dsdt_locally = 1; 53 return 0; 54} 55#endif 56 57static const struct dmi_system_id dsdt_dmi_table[] __initconst = { 58 /* 59 * Invoke DSDT corruption work-around on all Toshiba Satellite. 60 * https://bugzilla.kernel.org/show_bug.cgi?id=14679 61 */ 62 { 63 .callback = set_copy_dsdt, 64 .ident = "TOSHIBA Satellite", 65 .matches = { 66 DMI_MATCH(DMI_SYS_VENDOR, "TOSHIBA"), 67 DMI_MATCH(DMI_PRODUCT_NAME, "Satellite"), 68 }, 69 }, 70 {} 71}; 72#endif 73 74/* -------------------------------------------------------------------------- 75 Device Management 76 -------------------------------------------------------------------------- */ 77 78acpi_status acpi_bus_get_status_handle(acpi_handle handle, 79 unsigned long long *sta) 80{ 81 acpi_status status; 82 83 status = acpi_evaluate_integer(handle, "_STA", NULL, sta); 84 if (ACPI_SUCCESS(status)) 85 return AE_OK; 86 87 if (status == AE_NOT_FOUND) { 88 *sta = ACPI_STA_DEVICE_PRESENT | ACPI_STA_DEVICE_ENABLED | 89 ACPI_STA_DEVICE_UI | ACPI_STA_DEVICE_FUNCTIONING; 90 return AE_OK; 91 } 92 return status; 93} 94EXPORT_SYMBOL_GPL(acpi_bus_get_status_handle); 95 96int acpi_bus_get_status(struct acpi_device *device) 97{ 98 acpi_status status; 99 unsigned long long sta; 100 101 if (acpi_device_override_status(device, &sta)) { 102 acpi_set_device_status(device, sta); 103 return 0; 104 } 105 106 /* Battery devices must have their deps met before calling _STA */ 107 if (acpi_device_is_battery(device) && device->dep_unmet) { 108 acpi_set_device_status(device, 0); 109 return 0; 110 } 111 112 status = acpi_bus_get_status_handle(device->handle, &sta); 113 if (ACPI_FAILURE(status)) 114 return -ENODEV; 115 116 acpi_set_device_status(device, sta); 117 118 if (device->status.functional && !device->status.present) { 119 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Device [%s] status [%08x]: " 120 "functional but not present;\n", 121 device->pnp.bus_id, (u32)sta)); 122 } 123 124 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Device [%s] status [%08x]\n", 125 device->pnp.bus_id, (u32)sta)); 126 return 0; 127} 128EXPORT_SYMBOL(acpi_bus_get_status); 129 130void acpi_bus_private_data_handler(acpi_handle handle, 131 void *context) 132{ 133 return; 134} 135EXPORT_SYMBOL(acpi_bus_private_data_handler); 136 137int acpi_bus_attach_private_data(acpi_handle handle, void *data) 138{ 139 acpi_status status; 140 141 status = acpi_attach_data(handle, 142 acpi_bus_private_data_handler, data); 143 if (ACPI_FAILURE(status)) { 144 acpi_handle_debug(handle, "Error attaching device data\n"); 145 return -ENODEV; 146 } 147 148 return 0; 149} 150EXPORT_SYMBOL_GPL(acpi_bus_attach_private_data); 151 152int acpi_bus_get_private_data(acpi_handle handle, void **data) 153{ 154 acpi_status status; 155 156 if (!data) 157 return -EINVAL; 158 159 status = acpi_get_data(handle, acpi_bus_private_data_handler, data); 160 if (ACPI_FAILURE(status)) { 161 acpi_handle_debug(handle, "No context for object\n"); 162 return -ENODEV; 163 } 164 165 return 0; 166} 167EXPORT_SYMBOL_GPL(acpi_bus_get_private_data); 168 169void acpi_bus_detach_private_data(acpi_handle handle) 170{ 171 acpi_detach_data(handle, acpi_bus_private_data_handler); 172} 173EXPORT_SYMBOL_GPL(acpi_bus_detach_private_data); 174 175static void acpi_print_osc_error(acpi_handle handle, 176 struct acpi_osc_context *context, char *error) 177{ 178 int i; 179 180 acpi_handle_debug(handle, "(%s): %s\n", context->uuid_str, error); 181 182 pr_debug("_OSC request data:"); 183 for (i = 0; i < context->cap.length; i += sizeof(u32)) 184 pr_debug(" %x", *((u32 *)(context->cap.pointer + i))); 185 186 pr_debug("\n"); 187} 188 189acpi_status acpi_run_osc(acpi_handle handle, struct acpi_osc_context *context) 190{ 191 acpi_status status; 192 struct acpi_object_list input; 193 union acpi_object in_params[4]; 194 union acpi_object *out_obj; 195 guid_t guid; 196 u32 errors; 197 struct acpi_buffer output = {ACPI_ALLOCATE_BUFFER, NULL}; 198 199 if (!context) 200 return AE_ERROR; 201 if (guid_parse(context->uuid_str, &guid)) 202 return AE_ERROR; 203 context->ret.length = ACPI_ALLOCATE_BUFFER; 204 context->ret.pointer = NULL; 205 206 /* Setting up input parameters */ 207 input.count = 4; 208 input.pointer = in_params; 209 in_params[0].type = ACPI_TYPE_BUFFER; 210 in_params[0].buffer.length = 16; 211 in_params[0].buffer.pointer = (u8 *)&guid; 212 in_params[1].type = ACPI_TYPE_INTEGER; 213 in_params[1].integer.value = context->rev; 214 in_params[2].type = ACPI_TYPE_INTEGER; 215 in_params[2].integer.value = context->cap.length/sizeof(u32); 216 in_params[3].type = ACPI_TYPE_BUFFER; 217 in_params[3].buffer.length = context->cap.length; 218 in_params[3].buffer.pointer = context->cap.pointer; 219 220 status = acpi_evaluate_object(handle, "_OSC", &input, &output); 221 if (ACPI_FAILURE(status)) 222 return status; 223 224 if (!output.length) 225 return AE_NULL_OBJECT; 226 227 out_obj = output.pointer; 228 if (out_obj->type != ACPI_TYPE_BUFFER 229 || out_obj->buffer.length != context->cap.length) { 230 acpi_print_osc_error(handle, context, 231 "_OSC evaluation returned wrong type"); 232 status = AE_TYPE; 233 goto out_kfree; 234 } 235 /* Need to ignore the bit0 in result code */ 236 errors = *((u32 *)out_obj->buffer.pointer) & ~(1 << 0); 237 if (errors) { 238 if (errors & OSC_REQUEST_ERROR) 239 acpi_print_osc_error(handle, context, 240 "_OSC request failed"); 241 if (errors & OSC_INVALID_UUID_ERROR) 242 acpi_print_osc_error(handle, context, 243 "_OSC invalid UUID"); 244 if (errors & OSC_INVALID_REVISION_ERROR) 245 acpi_print_osc_error(handle, context, 246 "_OSC invalid revision"); 247 if (errors & OSC_CAPABILITIES_MASK_ERROR) { 248 if (((u32 *)context->cap.pointer)[OSC_QUERY_DWORD] 249 & OSC_QUERY_ENABLE) 250 goto out_success; 251 status = AE_SUPPORT; 252 goto out_kfree; 253 } 254 status = AE_ERROR; 255 goto out_kfree; 256 } 257out_success: 258 context->ret.length = out_obj->buffer.length; 259 context->ret.pointer = kmemdup(out_obj->buffer.pointer, 260 context->ret.length, GFP_KERNEL); 261 if (!context->ret.pointer) { 262 status = AE_NO_MEMORY; 263 goto out_kfree; 264 } 265 status = AE_OK; 266 267out_kfree: 268 kfree(output.pointer); 269 if (status != AE_OK) 270 context->ret.pointer = NULL; 271 return status; 272} 273EXPORT_SYMBOL(acpi_run_osc); 274 275bool osc_sb_apei_support_acked; 276 277/* 278 * ACPI 6.0 Section 8.4.4.2 Idle State Coordination 279 * OSPM supports platform coordinated low power idle(LPI) states 280 */ 281bool osc_pc_lpi_support_confirmed; 282EXPORT_SYMBOL_GPL(osc_pc_lpi_support_confirmed); 283 284static u8 sb_uuid_str[] = "0811B06E-4A27-44F9-8D60-3CBBC22E7B48"; 285static void acpi_bus_osc_support(void) 286{ 287 u32 capbuf[2]; 288 struct acpi_osc_context context = { 289 .uuid_str = sb_uuid_str, 290 .rev = 1, 291 .cap.length = 8, 292 .cap.pointer = capbuf, 293 }; 294 acpi_handle handle; 295 296 capbuf[OSC_QUERY_DWORD] = OSC_QUERY_ENABLE; 297 capbuf[OSC_SUPPORT_DWORD] = OSC_SB_PR3_SUPPORT; /* _PR3 is in use */ 298 if (IS_ENABLED(CONFIG_ACPI_PROCESSOR_AGGREGATOR)) 299 capbuf[OSC_SUPPORT_DWORD] |= OSC_SB_PAD_SUPPORT; 300 if (IS_ENABLED(CONFIG_ACPI_PROCESSOR)) 301 capbuf[OSC_SUPPORT_DWORD] |= OSC_SB_PPC_OST_SUPPORT; 302 303 capbuf[OSC_SUPPORT_DWORD] |= OSC_SB_HOTPLUG_OST_SUPPORT; 304 capbuf[OSC_SUPPORT_DWORD] |= OSC_SB_PCLPI_SUPPORT; 305 306#ifdef CONFIG_ARM64 307 capbuf[OSC_SUPPORT_DWORD] |= OSC_SB_GENERIC_INITIATOR_SUPPORT; 308#endif 309#ifdef CONFIG_X86 310 capbuf[OSC_SUPPORT_DWORD] |= OSC_SB_GENERIC_INITIATOR_SUPPORT; 311 if (boot_cpu_has(X86_FEATURE_HWP)) { 312 capbuf[OSC_SUPPORT_DWORD] |= OSC_SB_CPC_SUPPORT; 313 capbuf[OSC_SUPPORT_DWORD] |= OSC_SB_CPCV2_SUPPORT; 314 } 315#endif 316 317 if (IS_ENABLED(CONFIG_SCHED_MC_PRIO)) 318 capbuf[OSC_SUPPORT_DWORD] |= OSC_SB_CPC_DIVERSE_HIGH_SUPPORT; 319 320 if (!ghes_disable) 321 capbuf[OSC_SUPPORT_DWORD] |= OSC_SB_APEI_SUPPORT; 322 if (ACPI_FAILURE(acpi_get_handle(NULL, "\\_SB", &handle))) 323 return; 324 if (ACPI_SUCCESS(acpi_run_osc(handle, &context))) { 325 u32 *capbuf_ret = context.ret.pointer; 326 if (context.ret.length > OSC_SUPPORT_DWORD) { 327 osc_sb_apei_support_acked = 328 capbuf_ret[OSC_SUPPORT_DWORD] & OSC_SB_APEI_SUPPORT; 329 osc_pc_lpi_support_confirmed = 330 capbuf_ret[OSC_SUPPORT_DWORD] & OSC_SB_PCLPI_SUPPORT; 331 } 332 kfree(context.ret.pointer); 333 } 334 /* do we need to check other returned cap? Sounds no */ 335} 336 337/* -------------------------------------------------------------------------- 338 Notification Handling 339 -------------------------------------------------------------------------- */ 340 341/** 342 * acpi_bus_notify 343 * --------------- 344 * Callback for all 'system-level' device notifications (values 0x00-0x7F). 345 */ 346static void acpi_bus_notify(acpi_handle handle, u32 type, void *data) 347{ 348 struct acpi_device *adev; 349 struct acpi_driver *driver; 350 u32 ost_code = ACPI_OST_SC_NON_SPECIFIC_FAILURE; 351 bool hotplug_event = false; 352 353 switch (type) { 354 case ACPI_NOTIFY_BUS_CHECK: 355 acpi_handle_debug(handle, "ACPI_NOTIFY_BUS_CHECK event\n"); 356 hotplug_event = true; 357 break; 358 359 case ACPI_NOTIFY_DEVICE_CHECK: 360 acpi_handle_debug(handle, "ACPI_NOTIFY_DEVICE_CHECK event\n"); 361 hotplug_event = true; 362 break; 363 364 case ACPI_NOTIFY_DEVICE_WAKE: 365 acpi_handle_debug(handle, "ACPI_NOTIFY_DEVICE_WAKE event\n"); 366 break; 367 368 case ACPI_NOTIFY_EJECT_REQUEST: 369 acpi_handle_debug(handle, "ACPI_NOTIFY_EJECT_REQUEST event\n"); 370 hotplug_event = true; 371 break; 372 373 case ACPI_NOTIFY_DEVICE_CHECK_LIGHT: 374 acpi_handle_debug(handle, "ACPI_NOTIFY_DEVICE_CHECK_LIGHT event\n"); 375 /* TBD: Exactly what does 'light' mean? */ 376 break; 377 378 case ACPI_NOTIFY_FREQUENCY_MISMATCH: 379 acpi_handle_err(handle, "Device cannot be configured due " 380 "to a frequency mismatch\n"); 381 break; 382 383 case ACPI_NOTIFY_BUS_MODE_MISMATCH: 384 acpi_handle_err(handle, "Device cannot be configured due " 385 "to a bus mode mismatch\n"); 386 break; 387 388 case ACPI_NOTIFY_POWER_FAULT: 389 acpi_handle_err(handle, "Device has suffered a power fault\n"); 390 break; 391 392 default: 393 acpi_handle_debug(handle, "Unknown event type 0x%x\n", type); 394 break; 395 } 396 397 adev = acpi_bus_get_acpi_device(handle); 398 if (!adev) 399 goto err; 400 401 driver = adev->driver; 402 if (driver && driver->ops.notify && 403 (driver->flags & ACPI_DRIVER_ALL_NOTIFY_EVENTS)) 404 driver->ops.notify(adev, type); 405 406 if (!hotplug_event) { 407 acpi_bus_put_acpi_device(adev); 408 return; 409 } 410 411 if (ACPI_SUCCESS(acpi_hotplug_schedule(adev, type))) 412 return; 413 414 acpi_bus_put_acpi_device(adev); 415 416 err: 417 acpi_evaluate_ost(handle, type, ost_code, NULL); 418} 419 420static void acpi_device_notify(acpi_handle handle, u32 event, void *data) 421{ 422 struct acpi_device *device = data; 423 424 device->driver->ops.notify(device, event); 425} 426 427static void acpi_device_notify_fixed(void *data) 428{ 429 struct acpi_device *device = data; 430 431 /* Fixed hardware devices have no handles */ 432 acpi_device_notify(NULL, ACPI_FIXED_HARDWARE_EVENT, device); 433} 434 435static u32 acpi_device_fixed_event(void *data) 436{ 437 acpi_os_execute(OSL_NOTIFY_HANDLER, acpi_device_notify_fixed, data); 438 return ACPI_INTERRUPT_HANDLED; 439} 440 441static int acpi_device_install_notify_handler(struct acpi_device *device) 442{ 443 acpi_status status; 444 445 if (device->device_type == ACPI_BUS_TYPE_POWER_BUTTON) 446 status = 447 acpi_install_fixed_event_handler(ACPI_EVENT_POWER_BUTTON, 448 acpi_device_fixed_event, 449 device); 450 else if (device->device_type == ACPI_BUS_TYPE_SLEEP_BUTTON) 451 status = 452 acpi_install_fixed_event_handler(ACPI_EVENT_SLEEP_BUTTON, 453 acpi_device_fixed_event, 454 device); 455 else 456 status = acpi_install_notify_handler(device->handle, 457 ACPI_DEVICE_NOTIFY, 458 acpi_device_notify, 459 device); 460 461 if (ACPI_FAILURE(status)) 462 return -EINVAL; 463 return 0; 464} 465 466static void acpi_device_remove_notify_handler(struct acpi_device *device) 467{ 468 if (device->device_type == ACPI_BUS_TYPE_POWER_BUTTON) 469 acpi_remove_fixed_event_handler(ACPI_EVENT_POWER_BUTTON, 470 acpi_device_fixed_event); 471 else if (device->device_type == ACPI_BUS_TYPE_SLEEP_BUTTON) 472 acpi_remove_fixed_event_handler(ACPI_EVENT_SLEEP_BUTTON, 473 acpi_device_fixed_event); 474 else 475 acpi_remove_notify_handler(device->handle, ACPI_DEVICE_NOTIFY, 476 acpi_device_notify); 477} 478 479/* Handle events targeting \_SB device (at present only graceful shutdown) */ 480 481#define ACPI_SB_NOTIFY_SHUTDOWN_REQUEST 0x81 482#define ACPI_SB_INDICATE_INTERVAL 10000 483 484static void sb_notify_work(struct work_struct *dummy) 485{ 486 acpi_handle sb_handle; 487 488 orderly_poweroff(true); 489 490 /* 491 * After initiating graceful shutdown, the ACPI spec requires OSPM 492 * to evaluate _OST method once every 10seconds to indicate that 493 * the shutdown is in progress 494 */ 495 acpi_get_handle(NULL, "\\_SB", &sb_handle); 496 while (1) { 497 pr_info("Graceful shutdown in progress.\n"); 498 acpi_evaluate_ost(sb_handle, ACPI_OST_EC_OSPM_SHUTDOWN, 499 ACPI_OST_SC_OS_SHUTDOWN_IN_PROGRESS, NULL); 500 msleep(ACPI_SB_INDICATE_INTERVAL); 501 } 502} 503 504static void acpi_sb_notify(acpi_handle handle, u32 event, void *data) 505{ 506 static DECLARE_WORK(acpi_sb_work, sb_notify_work); 507 508 if (event == ACPI_SB_NOTIFY_SHUTDOWN_REQUEST) { 509 if (!work_busy(&acpi_sb_work)) 510 schedule_work(&acpi_sb_work); 511 } else 512 pr_warn("event %x is not supported by \\_SB device\n", event); 513} 514 515static int __init acpi_setup_sb_notify_handler(void) 516{ 517 acpi_handle sb_handle; 518 519 if (ACPI_FAILURE(acpi_get_handle(NULL, "\\_SB", &sb_handle))) 520 return -ENXIO; 521 522 if (ACPI_FAILURE(acpi_install_notify_handler(sb_handle, ACPI_DEVICE_NOTIFY, 523 acpi_sb_notify, NULL))) 524 return -EINVAL; 525 526 return 0; 527} 528 529/* -------------------------------------------------------------------------- 530 Device Matching 531 -------------------------------------------------------------------------- */ 532 533/** 534 * acpi_get_first_physical_node - Get first physical node of an ACPI device 535 * @adev: ACPI device in question 536 * 537 * Return: First physical node of ACPI device @adev 538 */ 539struct device *acpi_get_first_physical_node(struct acpi_device *adev) 540{ 541 struct mutex *physical_node_lock = &adev->physical_node_lock; 542 struct device *phys_dev; 543 544 mutex_lock(physical_node_lock); 545 if (list_empty(&adev->physical_node_list)) { 546 phys_dev = NULL; 547 } else { 548 const struct acpi_device_physical_node *node; 549 550 node = list_first_entry(&adev->physical_node_list, 551 struct acpi_device_physical_node, node); 552 553 phys_dev = node->dev; 554 } 555 mutex_unlock(physical_node_lock); 556 return phys_dev; 557} 558EXPORT_SYMBOL_GPL(acpi_get_first_physical_node); 559 560static struct acpi_device *acpi_primary_dev_companion(struct acpi_device *adev, 561 const struct device *dev) 562{ 563 const struct device *phys_dev = acpi_get_first_physical_node(adev); 564 565 return phys_dev && phys_dev == dev ? adev : NULL; 566} 567 568/** 569 * acpi_device_is_first_physical_node - Is given dev first physical node 570 * @adev: ACPI companion device 571 * @dev: Physical device to check 572 * 573 * Function checks if given @dev is the first physical devices attached to 574 * the ACPI companion device. This distinction is needed in some cases 575 * where the same companion device is shared between many physical devices. 576 * 577 * Note that the caller have to provide valid @adev pointer. 578 */ 579bool acpi_device_is_first_physical_node(struct acpi_device *adev, 580 const struct device *dev) 581{ 582 return !!acpi_primary_dev_companion(adev, dev); 583} 584 585/* 586 * acpi_companion_match() - Can we match via ACPI companion device 587 * @dev: Device in question 588 * 589 * Check if the given device has an ACPI companion and if that companion has 590 * a valid list of PNP IDs, and if the device is the first (primary) physical 591 * device associated with it. Return the companion pointer if that's the case 592 * or NULL otherwise. 593 * 594 * If multiple physical devices are attached to a single ACPI companion, we need 595 * to be careful. The usage scenario for this kind of relationship is that all 596 * of the physical devices in question use resources provided by the ACPI 597 * companion. A typical case is an MFD device where all the sub-devices share 598 * the parent's ACPI companion. In such cases we can only allow the primary 599 * (first) physical device to be matched with the help of the companion's PNP 600 * IDs. 601 * 602 * Additional physical devices sharing the ACPI companion can still use 603 * resources available from it but they will be matched normally using functions 604 * provided by their bus types (and analogously for their modalias). 605 */ 606struct acpi_device *acpi_companion_match(const struct device *dev) 607{ 608 struct acpi_device *adev; 609 610 adev = ACPI_COMPANION(dev); 611 if (!adev) 612 return NULL; 613 614 if (list_empty(&adev->pnp.ids)) 615 return NULL; 616 617 return acpi_primary_dev_companion(adev, dev); 618} 619 620/** 621 * acpi_of_match_device - Match device object using the "compatible" property. 622 * @adev: ACPI device object to match. 623 * @of_match_table: List of device IDs to match against. 624 * @of_id: OF ID if matched 625 * 626 * If @dev has an ACPI companion which has ACPI_DT_NAMESPACE_HID in its list of 627 * identifiers and a _DSD object with the "compatible" property, use that 628 * property to match against the given list of identifiers. 629 */ 630static bool acpi_of_match_device(struct acpi_device *adev, 631 const struct of_device_id *of_match_table, 632 const struct of_device_id **of_id) 633{ 634 const union acpi_object *of_compatible, *obj; 635 int i, nval; 636 637 if (!adev) 638 return false; 639 640 of_compatible = adev->data.of_compatible; 641 if (!of_match_table || !of_compatible) 642 return false; 643 644 if (of_compatible->type == ACPI_TYPE_PACKAGE) { 645 nval = of_compatible->package.count; 646 obj = of_compatible->package.elements; 647 } else { /* Must be ACPI_TYPE_STRING. */ 648 nval = 1; 649 obj = of_compatible; 650 } 651 /* Now we can look for the driver DT compatible strings */ 652 for (i = 0; i < nval; i++, obj++) { 653 const struct of_device_id *id; 654 655 for (id = of_match_table; id->compatible[0]; id++) 656 if (!strcasecmp(obj->string.pointer, id->compatible)) { 657 if (of_id) 658 *of_id = id; 659 return true; 660 } 661 } 662 663 return false; 664} 665 666static bool acpi_of_modalias(struct acpi_device *adev, 667 char *modalias, size_t len) 668{ 669 const union acpi_object *of_compatible; 670 const union acpi_object *obj; 671 const char *str, *chr; 672 673 of_compatible = adev->data.of_compatible; 674 if (!of_compatible) 675 return false; 676 677 if (of_compatible->type == ACPI_TYPE_PACKAGE) 678 obj = of_compatible->package.elements; 679 else /* Must be ACPI_TYPE_STRING. */ 680 obj = of_compatible; 681 682 str = obj->string.pointer; 683 chr = strchr(str, ','); 684 strlcpy(modalias, chr ? chr + 1 : str, len); 685 686 return true; 687} 688 689/** 690 * acpi_set_modalias - Set modalias using "compatible" property or supplied ID 691 * @adev: ACPI device object to match 692 * @default_id: ID string to use as default if no compatible string found 693 * @modalias: Pointer to buffer that modalias value will be copied into 694 * @len: Length of modalias buffer 695 * 696 * This is a counterpart of of_modalias_node() for struct acpi_device objects. 697 * If there is a compatible string for @adev, it will be copied to @modalias 698 * with the vendor prefix stripped; otherwise, @default_id will be used. 699 */ 700void acpi_set_modalias(struct acpi_device *adev, const char *default_id, 701 char *modalias, size_t len) 702{ 703 if (!acpi_of_modalias(adev, modalias, len)) 704 strlcpy(modalias, default_id, len); 705} 706EXPORT_SYMBOL_GPL(acpi_set_modalias); 707 708static bool __acpi_match_device_cls(const struct acpi_device_id *id, 709 struct acpi_hardware_id *hwid) 710{ 711 int i, msk, byte_shift; 712 char buf[3]; 713 714 if (!id->cls) 715 return false; 716 717 /* Apply class-code bitmask, before checking each class-code byte */ 718 for (i = 1; i <= 3; i++) { 719 byte_shift = 8 * (3 - i); 720 msk = (id->cls_msk >> byte_shift) & 0xFF; 721 if (!msk) 722 continue; 723 724 sprintf(buf, "%02x", (id->cls >> byte_shift) & msk); 725 if (strncmp(buf, &hwid->id[(i - 1) * 2], 2)) 726 return false; 727 } 728 return true; 729} 730 731static bool __acpi_match_device(struct acpi_device *device, 732 const struct acpi_device_id *acpi_ids, 733 const struct of_device_id *of_ids, 734 const struct acpi_device_id **acpi_id, 735 const struct of_device_id **of_id) 736{ 737 const struct acpi_device_id *id; 738 struct acpi_hardware_id *hwid; 739 740 /* 741 * If the device is not present, it is unnecessary to load device 742 * driver for it. 743 */ 744 if (!device || !device->status.present) 745 return false; 746 747 list_for_each_entry(hwid, &device->pnp.ids, list) { 748 /* First, check the ACPI/PNP IDs provided by the caller. */ 749 if (acpi_ids) { 750 for (id = acpi_ids; id->id[0] || id->cls; id++) { 751 if (id->id[0] && !strcmp((char *)id->id, hwid->id)) 752 goto out_acpi_match; 753 if (id->cls && __acpi_match_device_cls(id, hwid)) 754 goto out_acpi_match; 755 } 756 } 757 758 /* 759 * Next, check ACPI_DT_NAMESPACE_HID and try to match the 760 * "compatible" property if found. 761 */ 762 if (!strcmp(ACPI_DT_NAMESPACE_HID, hwid->id)) 763 return acpi_of_match_device(device, of_ids, of_id); 764 } 765 return false; 766 767out_acpi_match: 768 if (acpi_id) 769 *acpi_id = id; 770 return true; 771} 772 773/** 774 * acpi_match_device - Match a struct device against a given list of ACPI IDs 775 * @ids: Array of struct acpi_device_id object to match against. 776 * @dev: The device structure to match. 777 * 778 * Check if @dev has a valid ACPI handle and if there is a struct acpi_device 779 * object for that handle and use that object to match against a given list of 780 * device IDs. 781 * 782 * Return a pointer to the first matching ID on success or %NULL on failure. 783 */ 784const struct acpi_device_id *acpi_match_device(const struct acpi_device_id *ids, 785 const struct device *dev) 786{ 787 const struct acpi_device_id *id = NULL; 788 789 __acpi_match_device(acpi_companion_match(dev), ids, NULL, &id, NULL); 790 return id; 791} 792EXPORT_SYMBOL_GPL(acpi_match_device); 793 794static const void *acpi_of_device_get_match_data(const struct device *dev) 795{ 796 struct acpi_device *adev = ACPI_COMPANION(dev); 797 const struct of_device_id *match = NULL; 798 799 if (!acpi_of_match_device(adev, dev->driver->of_match_table, &match)) 800 return NULL; 801 802 return match->data; 803} 804 805const void *acpi_device_get_match_data(const struct device *dev) 806{ 807 const struct acpi_device_id *match; 808 809 if (!dev->driver->acpi_match_table) 810 return acpi_of_device_get_match_data(dev); 811 812 match = acpi_match_device(dev->driver->acpi_match_table, dev); 813 if (!match) 814 return NULL; 815 816 return (const void *)match->driver_data; 817} 818EXPORT_SYMBOL_GPL(acpi_device_get_match_data); 819 820int acpi_match_device_ids(struct acpi_device *device, 821 const struct acpi_device_id *ids) 822{ 823 return __acpi_match_device(device, ids, NULL, NULL, NULL) ? 0 : -ENOENT; 824} 825EXPORT_SYMBOL(acpi_match_device_ids); 826 827bool acpi_driver_match_device(struct device *dev, 828 const struct device_driver *drv) 829{ 830 if (!drv->acpi_match_table) 831 return acpi_of_match_device(ACPI_COMPANION(dev), 832 drv->of_match_table, 833 NULL); 834 835 return __acpi_match_device(acpi_companion_match(dev), 836 drv->acpi_match_table, drv->of_match_table, 837 NULL, NULL); 838} 839EXPORT_SYMBOL_GPL(acpi_driver_match_device); 840 841/* -------------------------------------------------------------------------- 842 ACPI Driver Management 843 -------------------------------------------------------------------------- */ 844 845/** 846 * acpi_bus_register_driver - register a driver with the ACPI bus 847 * @driver: driver being registered 848 * 849 * Registers a driver with the ACPI bus. Searches the namespace for all 850 * devices that match the driver's criteria and binds. Returns zero for 851 * success or a negative error status for failure. 852 */ 853int acpi_bus_register_driver(struct acpi_driver *driver) 854{ 855 int ret; 856 857 if (acpi_disabled) 858 return -ENODEV; 859 driver->drv.name = driver->name; 860 driver->drv.bus = &acpi_bus_type; 861 driver->drv.owner = driver->owner; 862 863 ret = driver_register(&driver->drv); 864 return ret; 865} 866 867EXPORT_SYMBOL(acpi_bus_register_driver); 868 869/** 870 * acpi_bus_unregister_driver - unregisters a driver with the ACPI bus 871 * @driver: driver to unregister 872 * 873 * Unregisters a driver with the ACPI bus. Searches the namespace for all 874 * devices that match the driver's criteria and unbinds. 875 */ 876void acpi_bus_unregister_driver(struct acpi_driver *driver) 877{ 878 driver_unregister(&driver->drv); 879} 880 881EXPORT_SYMBOL(acpi_bus_unregister_driver); 882 883/* -------------------------------------------------------------------------- 884 ACPI Bus operations 885 -------------------------------------------------------------------------- */ 886 887static int acpi_bus_match(struct device *dev, struct device_driver *drv) 888{ 889 struct acpi_device *acpi_dev = to_acpi_device(dev); 890 struct acpi_driver *acpi_drv = to_acpi_driver(drv); 891 892 return acpi_dev->flags.match_driver 893 && !acpi_match_device_ids(acpi_dev, acpi_drv->ids); 894} 895 896static int acpi_device_uevent(struct device *dev, struct kobj_uevent_env *env) 897{ 898 return __acpi_device_uevent_modalias(to_acpi_device(dev), env); 899} 900 901static int acpi_device_probe(struct device *dev) 902{ 903 struct acpi_device *acpi_dev = to_acpi_device(dev); 904 struct acpi_driver *acpi_drv = to_acpi_driver(dev->driver); 905 int ret; 906 907 if (acpi_dev->handler && !acpi_is_pnp_device(acpi_dev)) 908 return -EINVAL; 909 910 if (!acpi_drv->ops.add) 911 return -ENOSYS; 912 913 ret = acpi_drv->ops.add(acpi_dev); 914 if (ret) 915 return ret; 916 917 acpi_dev->driver = acpi_drv; 918 ACPI_DEBUG_PRINT((ACPI_DB_INFO, 919 "Driver [%s] successfully bound to device [%s]\n", 920 acpi_drv->name, acpi_dev->pnp.bus_id)); 921 922 if (acpi_drv->ops.notify) { 923 ret = acpi_device_install_notify_handler(acpi_dev); 924 if (ret) { 925 if (acpi_drv->ops.remove) 926 acpi_drv->ops.remove(acpi_dev); 927 928 acpi_dev->driver = NULL; 929 acpi_dev->driver_data = NULL; 930 return ret; 931 } 932 } 933 934 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found driver [%s] for device [%s]\n", 935 acpi_drv->name, acpi_dev->pnp.bus_id)); 936 get_device(dev); 937 return 0; 938} 939 940static int acpi_device_remove(struct device *dev) 941{ 942 struct acpi_device *acpi_dev = to_acpi_device(dev); 943 struct acpi_driver *acpi_drv = acpi_dev->driver; 944 945 if (acpi_drv) { 946 if (acpi_drv->ops.notify) 947 acpi_device_remove_notify_handler(acpi_dev); 948 if (acpi_drv->ops.remove) 949 acpi_drv->ops.remove(acpi_dev); 950 } 951 acpi_dev->driver = NULL; 952 acpi_dev->driver_data = NULL; 953 954 put_device(dev); 955 return 0; 956} 957 958struct bus_type acpi_bus_type = { 959 .name = "acpi", 960 .match = acpi_bus_match, 961 .probe = acpi_device_probe, 962 .remove = acpi_device_remove, 963 .uevent = acpi_device_uevent, 964}; 965 966/* -------------------------------------------------------------------------- 967 Initialization/Cleanup 968 -------------------------------------------------------------------------- */ 969 970static int __init acpi_bus_init_irq(void) 971{ 972 acpi_status status; 973 char *message = NULL; 974 975 976 /* 977 * Let the system know what interrupt model we are using by 978 * evaluating the \_PIC object, if exists. 979 */ 980 981 switch (acpi_irq_model) { 982 case ACPI_IRQ_MODEL_PIC: 983 message = "PIC"; 984 break; 985 case ACPI_IRQ_MODEL_IOAPIC: 986 message = "IOAPIC"; 987 break; 988 case ACPI_IRQ_MODEL_IOSAPIC: 989 message = "IOSAPIC"; 990 break; 991 case ACPI_IRQ_MODEL_GIC: 992 message = "GIC"; 993 break; 994 case ACPI_IRQ_MODEL_PLATFORM: 995 message = "platform specific model"; 996 break; 997 case ACPI_IRQ_MODEL_LPIC: 998 message = "LPIC"; 999 break; 1000 default: 1001 printk(KERN_WARNING PREFIX "Unknown interrupt routing model\n"); 1002 return -ENODEV; 1003 } 1004 1005 printk(KERN_INFO PREFIX "Using %s for interrupt routing\n", message); 1006 1007 status = acpi_execute_simple_method(NULL, "\\_PIC", acpi_irq_model); 1008 if (ACPI_FAILURE(status) && (status != AE_NOT_FOUND)) { 1009 ACPI_EXCEPTION((AE_INFO, status, "Evaluating _PIC")); 1010 return -ENODEV; 1011 } 1012 1013 return 0; 1014} 1015 1016/** 1017 * acpi_early_init - Initialize ACPICA and populate the ACPI namespace. 1018 * 1019 * The ACPI tables are accessible after this, but the handling of events has not 1020 * been initialized and the global lock is not available yet, so AML should not 1021 * be executed at this point. 1022 * 1023 * Doing this before switching the EFI runtime services to virtual mode allows 1024 * the EfiBootServices memory to be freed slightly earlier on boot. 1025 */ 1026void __init acpi_early_init(void) 1027{ 1028 acpi_status status; 1029 1030 if (acpi_disabled) 1031 return; 1032 1033 printk(KERN_INFO PREFIX "Core revision %08x\n", ACPI_CA_VERSION); 1034 1035 /* enable workarounds, unless strict ACPI spec. compliance */ 1036 if (!acpi_strict) 1037 acpi_gbl_enable_interpreter_slack = TRUE; 1038 1039 acpi_permanent_mmap = true; 1040 1041#ifdef CONFIG_X86 1042 /* 1043 * If the machine falls into the DMI check table, 1044 * DSDT will be copied to memory. 1045 * Note that calling dmi_check_system() here on other architectures 1046 * would not be OK because only x86 initializes dmi early enough. 1047 * Thankfully only x86 systems need such quirks for now. 1048 */ 1049 dmi_check_system(dsdt_dmi_table); 1050#endif 1051 1052 status = acpi_reallocate_root_table(); 1053 if (ACPI_FAILURE(status)) { 1054 printk(KERN_ERR PREFIX 1055 "Unable to reallocate ACPI tables\n"); 1056 goto error0; 1057 } 1058 1059 status = acpi_initialize_subsystem(); 1060 if (ACPI_FAILURE(status)) { 1061 printk(KERN_ERR PREFIX 1062 "Unable to initialize the ACPI Interpreter\n"); 1063 goto error0; 1064 } 1065 1066#ifdef CONFIG_X86 1067 if (!acpi_ioapic) { 1068 /* compatible (0) means level (3) */ 1069 if (!(acpi_sci_flags & ACPI_MADT_TRIGGER_MASK)) { 1070 acpi_sci_flags &= ~ACPI_MADT_TRIGGER_MASK; 1071 acpi_sci_flags |= ACPI_MADT_TRIGGER_LEVEL; 1072 } 1073 /* Set PIC-mode SCI trigger type */ 1074 acpi_pic_sci_set_trigger(acpi_gbl_FADT.sci_interrupt, 1075 (acpi_sci_flags & ACPI_MADT_TRIGGER_MASK) >> 2); 1076 } else { 1077 /* 1078 * now that acpi_gbl_FADT is initialized, 1079 * update it with result from INT_SRC_OVR parsing 1080 */ 1081 acpi_gbl_FADT.sci_interrupt = acpi_sci_override_gsi; 1082 } 1083#endif 1084 return; 1085 1086 error0: 1087 disable_acpi(); 1088} 1089 1090/** 1091 * acpi_subsystem_init - Finalize the early initialization of ACPI. 1092 * 1093 * Switch over the platform to the ACPI mode (if possible). 1094 * 1095 * Doing this too early is generally unsafe, but at the same time it needs to be 1096 * done before all things that really depend on ACPI. The right spot appears to 1097 * be before finalizing the EFI initialization. 1098 */ 1099void __init acpi_subsystem_init(void) 1100{ 1101 acpi_status status; 1102 1103 if (acpi_disabled) 1104 return; 1105 1106 status = acpi_enable_subsystem(~ACPI_NO_ACPI_ENABLE); 1107 if (ACPI_FAILURE(status)) { 1108 printk(KERN_ERR PREFIX "Unable to enable ACPI\n"); 1109 disable_acpi(); 1110 } else { 1111 /* 1112 * If the system is using ACPI then we can be reasonably 1113 * confident that any regulators are managed by the firmware 1114 * so tell the regulator core it has everything it needs to 1115 * know. 1116 */ 1117 regulator_has_full_constraints(); 1118 } 1119} 1120 1121static acpi_status acpi_bus_table_handler(u32 event, void *table, void *context) 1122{ 1123 acpi_scan_table_handler(event, table, context); 1124 1125 return acpi_sysfs_table_handler(event, table, context); 1126} 1127 1128static int __init acpi_bus_init(void) 1129{ 1130 int result; 1131 acpi_status status; 1132 1133 acpi_os_initialize1(); 1134 1135 status = acpi_load_tables(); 1136 if (ACPI_FAILURE(status)) { 1137 printk(KERN_ERR PREFIX 1138 "Unable to load the System Description Tables\n"); 1139 goto error1; 1140 } 1141 1142 /* 1143 * ACPI 2.0 requires the EC driver to be loaded and work before the EC 1144 * device is found in the namespace. 1145 * 1146 * This is accomplished by looking for the ECDT table and getting the EC 1147 * parameters out of that. 1148 * 1149 * Do that before calling acpi_initialize_objects() which may trigger EC 1150 * address space accesses. 1151 */ 1152 acpi_ec_ecdt_probe(); 1153 1154 status = acpi_enable_subsystem(ACPI_NO_ACPI_ENABLE); 1155 if (ACPI_FAILURE(status)) { 1156 printk(KERN_ERR PREFIX 1157 "Unable to start the ACPI Interpreter\n"); 1158 goto error1; 1159 } 1160 1161 status = acpi_initialize_objects(ACPI_FULL_INITIALIZATION); 1162 if (ACPI_FAILURE(status)) { 1163 printk(KERN_ERR PREFIX "Unable to initialize ACPI objects\n"); 1164 goto error1; 1165 } 1166 1167 /* Set capability bits for _OSC under processor scope */ 1168 acpi_early_processor_osc(); 1169 1170 /* 1171 * _OSC method may exist in module level code, 1172 * so it must be run after ACPI_FULL_INITIALIZATION 1173 */ 1174 acpi_bus_osc_support(); 1175 1176 /* 1177 * _PDC control method may load dynamic SSDT tables, 1178 * and we need to install the table handler before that. 1179 */ 1180 status = acpi_install_table_handler(acpi_bus_table_handler, NULL); 1181 1182 acpi_sysfs_init(); 1183 1184 acpi_early_processor_set_pdc(); 1185 1186 /* 1187 * Maybe EC region is required at bus_scan/acpi_get_devices. So it 1188 * is necessary to enable it as early as possible. 1189 */ 1190 acpi_ec_dsdt_probe(); 1191 1192 printk(KERN_INFO PREFIX "Interpreter enabled\n"); 1193 1194 /* Initialize sleep structures */ 1195 acpi_sleep_init(); 1196 1197 /* 1198 * Get the system interrupt model and evaluate \_PIC. 1199 */ 1200 result = acpi_bus_init_irq(); 1201 if (result) 1202 goto error1; 1203 1204 /* 1205 * Register the for all standard device notifications. 1206 */ 1207 status = 1208 acpi_install_notify_handler(ACPI_ROOT_OBJECT, ACPI_SYSTEM_NOTIFY, 1209 &acpi_bus_notify, NULL); 1210 if (ACPI_FAILURE(status)) { 1211 printk(KERN_ERR PREFIX 1212 "Unable to register for device notifications\n"); 1213 goto error1; 1214 } 1215 1216 /* 1217 * Create the top ACPI proc directory 1218 */ 1219 acpi_root_dir = proc_mkdir(ACPI_BUS_FILE_ROOT, NULL); 1220 1221 result = bus_register(&acpi_bus_type); 1222 if (!result) 1223 return 0; 1224 1225 /* Mimic structured exception handling */ 1226 error1: 1227 acpi_terminate(); 1228 return -ENODEV; 1229} 1230 1231struct kobject *acpi_kobj; 1232EXPORT_SYMBOL_GPL(acpi_kobj); 1233 1234static int __init acpi_init(void) 1235{ 1236 int result; 1237 1238 if (acpi_disabled) { 1239 printk(KERN_INFO PREFIX "Interpreter disabled.\n"); 1240 return -ENODEV; 1241 } 1242 1243 acpi_kobj = kobject_create_and_add("acpi", firmware_kobj); 1244 if (!acpi_kobj) { 1245 printk(KERN_WARNING "%s: kset create error\n", __func__); 1246 acpi_kobj = NULL; 1247 } 1248 1249 result = acpi_bus_init(); 1250 if (result) { 1251 kobject_put(acpi_kobj); 1252 disable_acpi(); 1253 return result; 1254 } 1255 1256 pci_mmcfg_late_init(); 1257 acpi_iort_init(); 1258 acpi_hest_init(); 1259 ghes_init(); 1260 acpi_scan_init(); 1261 acpi_ec_init(); 1262 acpi_debugfs_init(); 1263 acpi_sleep_proc_init(); 1264 acpi_wakeup_device_init(); 1265 acpi_debugger_init(); 1266 acpi_setup_sb_notify_handler(); 1267 return 0; 1268} 1269 1270subsys_initcall(acpi_init); 1271