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 35 ACPI_MODULE_NAME("bus"); 36 37 struct acpi_device *acpi_root; 38 struct proc_dir_entry *acpi_root_dir; 39 EXPORT_SYMBOL(acpi_root_dir); 40 41 #ifdef CONFIG_X86 42 #ifdef CONFIG_ACPI_CUSTOM_DSDT 43 static inline int set_copy_dsdt(const struct dmi_system_id *id) 44 { 45 return 0; 46 } 47 #else 48 static 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 57 static 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 78 acpi_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 } 94 EXPORT_SYMBOL_GPL(acpi_bus_get_status_handle); 95 96 int acpi_bus_get_status(struct acpi_device *device) 97 { 98 acpi_status status; 99 unsigned long long sta; 100 101 if (acpi_device_always_present(device)) { 102 acpi_set_device_status(device, ACPI_STA_DEFAULT); 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 } 128 EXPORT_SYMBOL(acpi_bus_get_status); 129 130 void acpi_bus_private_data_handler(acpi_handle handle, 131 void *context) 132 { 133 return; 134 } 135 EXPORT_SYMBOL(acpi_bus_private_data_handler); 136 137 int 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 } 150 EXPORT_SYMBOL_GPL(acpi_bus_attach_private_data); 151 152 int 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 } 167 EXPORT_SYMBOL_GPL(acpi_bus_get_private_data); 168 169 void acpi_bus_detach_private_data(acpi_handle handle) 170 { 171 acpi_detach_data(handle, acpi_bus_private_data_handler); 172 } 173 EXPORT_SYMBOL_GPL(acpi_bus_detach_private_data); 174 175 static 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 } 188 189 acpi_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 } 257 out_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; 266 267 out_kfree: 268 kfree(output.pointer); 269 if (status != AE_OK) 270 context->ret.pointer = NULL; 271 return status; 272 } 273 EXPORT_SYMBOL(acpi_run_osc); 274 275 bool 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 */ 281 bool osc_pc_lpi_support_confirmed; 282 EXPORT_SYMBOL_GPL(osc_pc_lpi_support_confirmed); 283 284 static u8 sb_uuid_str[] = "0811B06E-4A27-44F9-8D60-3CBBC22E7B48"; 285 static 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 */ 346 static 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 } 419 420 static 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 } 426 427 static 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 } 434 435 static 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 } 440 441 static 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 } 465 466 static 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 483 484 static 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 } 503 504 static 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 } 514 515 static 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 */ 539 struct 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 } 558 559 static struct acpi_device *acpi_primary_dev_companion(struct acpi_device *adev, 560 const struct device *dev) 561 { 562 const struct device *phys_dev = acpi_get_first_physical_node(adev); 563 564 return phys_dev && phys_dev == dev ? adev : NULL; 565 } 566 567 /** 568 * acpi_device_is_first_physical_node - Is given dev first physical node 569 * @adev: ACPI companion device 570 * @dev: Physical device to check 571 * 572 * Function checks if given @dev is the first physical devices attached to 573 * the ACPI companion device. This distinction is needed in some cases 574 * where the same companion device is shared between many physical devices. 575 * 576 * Note that the caller have to provide valid @adev pointer. 577 */ 578 bool acpi_device_is_first_physical_node(struct acpi_device *adev, 579 const struct device *dev) 580 { 581 return !!acpi_primary_dev_companion(adev, dev); 582 } 583 584 /* 585 * acpi_companion_match() - Can we match via ACPI companion device 586 * @dev: Device in question 587 * 588 * Check if the given device has an ACPI companion and if that companion has 589 * a valid list of PNP IDs, and if the device is the first (primary) physical 590 * device associated with it. Return the companion pointer if that's the case 591 * or NULL otherwise. 592 * 593 * If multiple physical devices are attached to a single ACPI companion, we need 594 * to be careful. The usage scenario for this kind of relationship is that all 595 * of the physical devices in question use resources provided by the ACPI 596 * companion. A typical case is an MFD device where all the sub-devices share 597 * the parent's ACPI companion. In such cases we can only allow the primary 598 * (first) physical device to be matched with the help of the companion's PNP 599 * IDs. 600 * 601 * Additional physical devices sharing the ACPI companion can still use 602 * resources available from it but they will be matched normally using functions 603 * provided by their bus types (and analogously for their modalias). 604 */ 605 struct acpi_device *acpi_companion_match(const struct device *dev) 606 { 607 struct acpi_device *adev; 608 609 adev = ACPI_COMPANION(dev); 610 if (!adev) 611 return NULL; 612 613 if (list_empty(&adev->pnp.ids)) 614 return NULL; 615 616 return acpi_primary_dev_companion(adev, dev); 617 } 618 619 /** 620 * acpi_of_match_device - Match device object using the "compatible" property. 621 * @adev: ACPI device object to match. 622 * @of_match_table: List of device IDs to match against. 623 * @of_id: OF ID if matched 624 * 625 * If @dev has an ACPI companion which has ACPI_DT_NAMESPACE_HID in its list of 626 * identifiers and a _DSD object with the "compatible" property, use that 627 * property to match against the given list of identifiers. 628 */ 629 static bool acpi_of_match_device(struct acpi_device *adev, 630 const struct of_device_id *of_match_table, 631 const struct of_device_id **of_id) 632 { 633 const union acpi_object *of_compatible, *obj; 634 int i, nval; 635 636 if (!adev) 637 return false; 638 639 of_compatible = adev->data.of_compatible; 640 if (!of_match_table || !of_compatible) 641 return false; 642 643 if (of_compatible->type == ACPI_TYPE_PACKAGE) { 644 nval = of_compatible->package.count; 645 obj = of_compatible->package.elements; 646 } else { /* Must be ACPI_TYPE_STRING. */ 647 nval = 1; 648 obj = of_compatible; 649 } 650 /* Now we can look for the driver DT compatible strings */ 651 for (i = 0; i < nval; i++, obj++) { 652 const struct of_device_id *id; 653 654 for (id = of_match_table; id->compatible[0]; id++) 655 if (!strcasecmp(obj->string.pointer, id->compatible)) { 656 if (of_id) 657 *of_id = id; 658 return true; 659 } 660 } 661 662 return false; 663 } 664 665 static bool acpi_of_modalias(struct acpi_device *adev, 666 char *modalias, size_t len) 667 { 668 const union acpi_object *of_compatible; 669 const union acpi_object *obj; 670 const char *str, *chr; 671 672 of_compatible = adev->data.of_compatible; 673 if (!of_compatible) 674 return false; 675 676 if (of_compatible->type == ACPI_TYPE_PACKAGE) 677 obj = of_compatible->package.elements; 678 else /* Must be ACPI_TYPE_STRING. */ 679 obj = of_compatible; 680 681 str = obj->string.pointer; 682 chr = strchr(str, ','); 683 strlcpy(modalias, chr ? chr + 1 : str, len); 684 685 return true; 686 } 687 688 /** 689 * acpi_set_modalias - Set modalias using "compatible" property or supplied ID 690 * @adev: ACPI device object to match 691 * @default_id: ID string to use as default if no compatible string found 692 * @modalias: Pointer to buffer that modalias value will be copied into 693 * @len: Length of modalias buffer 694 * 695 * This is a counterpart of of_modalias_node() for struct acpi_device objects. 696 * If there is a compatible string for @adev, it will be copied to @modalias 697 * with the vendor prefix stripped; otherwise, @default_id will be used. 698 */ 699 void acpi_set_modalias(struct acpi_device *adev, const char *default_id, 700 char *modalias, size_t len) 701 { 702 if (!acpi_of_modalias(adev, modalias, len)) 703 strlcpy(modalias, default_id, len); 704 } 705 EXPORT_SYMBOL_GPL(acpi_set_modalias); 706 707 static bool __acpi_match_device_cls(const struct acpi_device_id *id, 708 struct acpi_hardware_id *hwid) 709 { 710 int i, msk, byte_shift; 711 char buf[3]; 712 713 if (!id->cls) 714 return false; 715 716 /* Apply class-code bitmask, before checking each class-code byte */ 717 for (i = 1; i <= 3; i++) { 718 byte_shift = 8 * (3 - i); 719 msk = (id->cls_msk >> byte_shift) & 0xFF; 720 if (!msk) 721 continue; 722 723 sprintf(buf, "%02x", (id->cls >> byte_shift) & msk); 724 if (strncmp(buf, &hwid->id[(i - 1) * 2], 2)) 725 return false; 726 } 727 return true; 728 } 729 730 static bool __acpi_match_device(struct acpi_device *device, 731 const struct acpi_device_id *acpi_ids, 732 const struct of_device_id *of_ids, 733 const struct acpi_device_id **acpi_id, 734 const struct of_device_id **of_id) 735 { 736 const struct acpi_device_id *id; 737 struct acpi_hardware_id *hwid; 738 739 /* 740 * If the device is not present, it is unnecessary to load device 741 * driver for it. 742 */ 743 if (!device || !device->status.present) 744 return false; 745 746 list_for_each_entry(hwid, &device->pnp.ids, list) { 747 /* First, check the ACPI/PNP IDs provided by the caller. */ 748 if (acpi_ids) { 749 for (id = acpi_ids; id->id[0] || id->cls; id++) { 750 if (id->id[0] && !strcmp((char *)id->id, hwid->id)) 751 goto out_acpi_match; 752 if (id->cls && __acpi_match_device_cls(id, hwid)) 753 goto out_acpi_match; 754 } 755 } 756 757 /* 758 * Next, check ACPI_DT_NAMESPACE_HID and try to match the 759 * "compatible" property if found. 760 */ 761 if (!strcmp(ACPI_DT_NAMESPACE_HID, hwid->id)) 762 return acpi_of_match_device(device, of_ids, of_id); 763 } 764 return false; 765 766 out_acpi_match: 767 if (acpi_id) 768 *acpi_id = id; 769 return true; 770 } 771 772 /** 773 * acpi_match_device - Match a struct device against a given list of ACPI IDs 774 * @ids: Array of struct acpi_device_id object to match against. 775 * @dev: The device structure to match. 776 * 777 * Check if @dev has a valid ACPI handle and if there is a struct acpi_device 778 * object for that handle and use that object to match against a given list of 779 * device IDs. 780 * 781 * Return a pointer to the first matching ID on success or %NULL on failure. 782 */ 783 const struct acpi_device_id *acpi_match_device(const struct acpi_device_id *ids, 784 const struct device *dev) 785 { 786 const struct acpi_device_id *id = NULL; 787 788 __acpi_match_device(acpi_companion_match(dev), ids, NULL, &id, NULL); 789 return id; 790 } 791 EXPORT_SYMBOL_GPL(acpi_match_device); 792 793 static const void *acpi_of_device_get_match_data(const struct device *dev) 794 { 795 struct acpi_device *adev = ACPI_COMPANION(dev); 796 const struct of_device_id *match = NULL; 797 798 if (!acpi_of_match_device(adev, dev->driver->of_match_table, &match)) 799 return NULL; 800 801 return match->data; 802 } 803 804 const void *acpi_device_get_match_data(const struct device *dev) 805 { 806 const struct acpi_device_id *match; 807 808 if (!dev->driver->acpi_match_table) 809 return acpi_of_device_get_match_data(dev); 810 811 match = acpi_match_device(dev->driver->acpi_match_table, dev); 812 if (!match) 813 return NULL; 814 815 return (const void *)match->driver_data; 816 } 817 EXPORT_SYMBOL_GPL(acpi_device_get_match_data); 818 819 int acpi_match_device_ids(struct acpi_device *device, 820 const struct acpi_device_id *ids) 821 { 822 return __acpi_match_device(device, ids, NULL, NULL, NULL) ? 0 : -ENOENT; 823 } 824 EXPORT_SYMBOL(acpi_match_device_ids); 825 826 bool acpi_driver_match_device(struct device *dev, 827 const struct device_driver *drv) 828 { 829 if (!drv->acpi_match_table) 830 return acpi_of_match_device(ACPI_COMPANION(dev), 831 drv->of_match_table, 832 NULL); 833 834 return __acpi_match_device(acpi_companion_match(dev), 835 drv->acpi_match_table, drv->of_match_table, 836 NULL, NULL); 837 } 838 EXPORT_SYMBOL_GPL(acpi_driver_match_device); 839 840 /* -------------------------------------------------------------------------- 841 ACPI Driver Management 842 -------------------------------------------------------------------------- */ 843 844 /** 845 * acpi_bus_register_driver - register a driver with the ACPI bus 846 * @driver: driver being registered 847 * 848 * Registers a driver with the ACPI bus. Searches the namespace for all 849 * devices that match the driver's criteria and binds. Returns zero for 850 * success or a negative error status for failure. 851 */ 852 int acpi_bus_register_driver(struct acpi_driver *driver) 853 { 854 int ret; 855 856 if (acpi_disabled) 857 return -ENODEV; 858 driver->drv.name = driver->name; 859 driver->drv.bus = &acpi_bus_type; 860 driver->drv.owner = driver->owner; 861 862 ret = driver_register(&driver->drv); 863 return ret; 864 } 865 866 EXPORT_SYMBOL(acpi_bus_register_driver); 867 868 /** 869 * acpi_bus_unregister_driver - unregisters a driver with the ACPI bus 870 * @driver: driver to unregister 871 * 872 * Unregisters a driver with the ACPI bus. Searches the namespace for all 873 * devices that match the driver's criteria and unbinds. 874 */ 875 void acpi_bus_unregister_driver(struct acpi_driver *driver) 876 { 877 driver_unregister(&driver->drv); 878 } 879 880 EXPORT_SYMBOL(acpi_bus_unregister_driver); 881 882 /* -------------------------------------------------------------------------- 883 ACPI Bus operations 884 -------------------------------------------------------------------------- */ 885 886 static int acpi_bus_match(struct device *dev, struct device_driver *drv) 887 { 888 struct acpi_device *acpi_dev = to_acpi_device(dev); 889 struct acpi_driver *acpi_drv = to_acpi_driver(drv); 890 891 return acpi_dev->flags.match_driver 892 && !acpi_match_device_ids(acpi_dev, acpi_drv->ids); 893 } 894 895 static int acpi_device_uevent(struct device *dev, struct kobj_uevent_env *env) 896 { 897 return __acpi_device_uevent_modalias(to_acpi_device(dev), env); 898 } 899 900 static int acpi_device_probe(struct device *dev) 901 { 902 struct acpi_device *acpi_dev = to_acpi_device(dev); 903 struct acpi_driver *acpi_drv = to_acpi_driver(dev->driver); 904 int ret; 905 906 if (acpi_dev->handler && !acpi_is_pnp_device(acpi_dev)) 907 return -EINVAL; 908 909 if (!acpi_drv->ops.add) 910 return -ENOSYS; 911 912 ret = acpi_drv->ops.add(acpi_dev); 913 if (ret) 914 return ret; 915 916 acpi_dev->driver = acpi_drv; 917 ACPI_DEBUG_PRINT((ACPI_DB_INFO, 918 "Driver [%s] successfully bound to device [%s]\n", 919 acpi_drv->name, acpi_dev->pnp.bus_id)); 920 921 if (acpi_drv->ops.notify) { 922 ret = acpi_device_install_notify_handler(acpi_dev); 923 if (ret) { 924 if (acpi_drv->ops.remove) 925 acpi_drv->ops.remove(acpi_dev); 926 927 acpi_dev->driver = NULL; 928 acpi_dev->driver_data = NULL; 929 return ret; 930 } 931 } 932 933 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found driver [%s] for device [%s]\n", 934 acpi_drv->name, acpi_dev->pnp.bus_id)); 935 get_device(dev); 936 return 0; 937 } 938 939 static int acpi_device_remove(struct device *dev) 940 { 941 struct acpi_device *acpi_dev = to_acpi_device(dev); 942 struct acpi_driver *acpi_drv = acpi_dev->driver; 943 944 if (acpi_drv) { 945 if (acpi_drv->ops.notify) 946 acpi_device_remove_notify_handler(acpi_dev); 947 if (acpi_drv->ops.remove) 948 acpi_drv->ops.remove(acpi_dev); 949 } 950 acpi_dev->driver = NULL; 951 acpi_dev->driver_data = NULL; 952 953 put_device(dev); 954 return 0; 955 } 956 957 struct bus_type acpi_bus_type = { 958 .name = "acpi", 959 .match = acpi_bus_match, 960 .probe = acpi_device_probe, 961 .remove = acpi_device_remove, 962 .uevent = acpi_device_uevent, 963 }; 964 965 /* -------------------------------------------------------------------------- 966 Initialization/Cleanup 967 -------------------------------------------------------------------------- */ 968 969 static int __init acpi_bus_init_irq(void) 970 { 971 acpi_status status; 972 char *message = NULL; 973 974 975 /* 976 * Let the system know what interrupt model we are using by 977 * evaluating the \_PIC object, if exists. 978 */ 979 980 switch (acpi_irq_model) { 981 case ACPI_IRQ_MODEL_PIC: 982 message = "PIC"; 983 break; 984 case ACPI_IRQ_MODEL_IOAPIC: 985 message = "IOAPIC"; 986 break; 987 case ACPI_IRQ_MODEL_IOSAPIC: 988 message = "IOSAPIC"; 989 break; 990 case ACPI_IRQ_MODEL_GIC: 991 message = "GIC"; 992 break; 993 case ACPI_IRQ_MODEL_PLATFORM: 994 message = "platform specific model"; 995 break; 996 default: 997 printk(KERN_WARNING PREFIX "Unknown interrupt routing model\n"); 998 return -ENODEV; 999 } 1000 1001 printk(KERN_INFO PREFIX "Using %s for interrupt routing\n", message); 1002 1003 status = acpi_execute_simple_method(NULL, "\\_PIC", acpi_irq_model); 1004 if (ACPI_FAILURE(status) && (status != AE_NOT_FOUND)) { 1005 ACPI_EXCEPTION((AE_INFO, status, "Evaluating _PIC")); 1006 return -ENODEV; 1007 } 1008 1009 return 0; 1010 } 1011 1012 /** 1013 * acpi_early_init - Initialize ACPICA and populate the ACPI namespace. 1014 * 1015 * The ACPI tables are accessible after this, but the handling of events has not 1016 * been initialized and the global lock is not available yet, so AML should not 1017 * be executed at this point. 1018 * 1019 * Doing this before switching the EFI runtime services to virtual mode allows 1020 * the EfiBootServices memory to be freed slightly earlier on boot. 1021 */ 1022 void __init acpi_early_init(void) 1023 { 1024 acpi_status status; 1025 1026 if (acpi_disabled) 1027 return; 1028 1029 printk(KERN_INFO PREFIX "Core revision %08x\n", ACPI_CA_VERSION); 1030 1031 /* enable workarounds, unless strict ACPI spec. compliance */ 1032 if (!acpi_strict) 1033 acpi_gbl_enable_interpreter_slack = TRUE; 1034 1035 acpi_permanent_mmap = true; 1036 1037 #ifdef CONFIG_X86 1038 /* 1039 * If the machine falls into the DMI check table, 1040 * DSDT will be copied to memory. 1041 * Note that calling dmi_check_system() here on other architectures 1042 * would not be OK because only x86 initializes dmi early enough. 1043 * Thankfully only x86 systems need such quirks for now. 1044 */ 1045 dmi_check_system(dsdt_dmi_table); 1046 #endif 1047 1048 status = acpi_reallocate_root_table(); 1049 if (ACPI_FAILURE(status)) { 1050 printk(KERN_ERR PREFIX 1051 "Unable to reallocate ACPI tables\n"); 1052 goto error0; 1053 } 1054 1055 status = acpi_initialize_subsystem(); 1056 if (ACPI_FAILURE(status)) { 1057 printk(KERN_ERR PREFIX 1058 "Unable to initialize the ACPI Interpreter\n"); 1059 goto error0; 1060 } 1061 1062 #ifdef CONFIG_X86 1063 if (!acpi_ioapic) { 1064 /* compatible (0) means level (3) */ 1065 if (!(acpi_sci_flags & ACPI_MADT_TRIGGER_MASK)) { 1066 acpi_sci_flags &= ~ACPI_MADT_TRIGGER_MASK; 1067 acpi_sci_flags |= ACPI_MADT_TRIGGER_LEVEL; 1068 } 1069 /* Set PIC-mode SCI trigger type */ 1070 acpi_pic_sci_set_trigger(acpi_gbl_FADT.sci_interrupt, 1071 (acpi_sci_flags & ACPI_MADT_TRIGGER_MASK) >> 2); 1072 } else { 1073 /* 1074 * now that acpi_gbl_FADT is initialized, 1075 * update it with result from INT_SRC_OVR parsing 1076 */ 1077 acpi_gbl_FADT.sci_interrupt = acpi_sci_override_gsi; 1078 } 1079 #endif 1080 return; 1081 1082 error0: 1083 disable_acpi(); 1084 } 1085 1086 /** 1087 * acpi_subsystem_init - Finalize the early initialization of ACPI. 1088 * 1089 * Switch over the platform to the ACPI mode (if possible). 1090 * 1091 * Doing this too early is generally unsafe, but at the same time it needs to be 1092 * done before all things that really depend on ACPI. The right spot appears to 1093 * be before finalizing the EFI initialization. 1094 */ 1095 void __init acpi_subsystem_init(void) 1096 { 1097 acpi_status status; 1098 1099 if (acpi_disabled) 1100 return; 1101 1102 status = acpi_enable_subsystem(~ACPI_NO_ACPI_ENABLE); 1103 if (ACPI_FAILURE(status)) { 1104 printk(KERN_ERR PREFIX "Unable to enable ACPI\n"); 1105 disable_acpi(); 1106 } else { 1107 /* 1108 * If the system is using ACPI then we can be reasonably 1109 * confident that any regulators are managed by the firmware 1110 * so tell the regulator core it has everything it needs to 1111 * know. 1112 */ 1113 regulator_has_full_constraints(); 1114 } 1115 } 1116 1117 static acpi_status acpi_bus_table_handler(u32 event, void *table, void *context) 1118 { 1119 acpi_scan_table_handler(event, table, context); 1120 1121 return acpi_sysfs_table_handler(event, table, context); 1122 } 1123 1124 static int __init acpi_bus_init(void) 1125 { 1126 int result; 1127 acpi_status status; 1128 1129 acpi_os_initialize1(); 1130 1131 status = acpi_load_tables(); 1132 if (ACPI_FAILURE(status)) { 1133 printk(KERN_ERR PREFIX 1134 "Unable to load the System Description Tables\n"); 1135 goto error1; 1136 } 1137 1138 /* 1139 * ACPI 2.0 requires the EC driver to be loaded and work before the EC 1140 * device is found in the namespace. 1141 * 1142 * This is accomplished by looking for the ECDT table and getting the EC 1143 * parameters out of that. 1144 * 1145 * Do that before calling acpi_initialize_objects() which may trigger EC 1146 * address space accesses. 1147 */ 1148 acpi_ec_ecdt_probe(); 1149 1150 status = acpi_enable_subsystem(ACPI_NO_ACPI_ENABLE); 1151 if (ACPI_FAILURE(status)) { 1152 printk(KERN_ERR PREFIX 1153 "Unable to start the ACPI Interpreter\n"); 1154 goto error1; 1155 } 1156 1157 status = acpi_initialize_objects(ACPI_FULL_INITIALIZATION); 1158 if (ACPI_FAILURE(status)) { 1159 printk(KERN_ERR PREFIX "Unable to initialize ACPI objects\n"); 1160 goto error1; 1161 } 1162 1163 /* Set capability bits for _OSC under processor scope */ 1164 acpi_early_processor_osc(); 1165 1166 /* 1167 * _OSC method may exist in module level code, 1168 * so it must be run after ACPI_FULL_INITIALIZATION 1169 */ 1170 acpi_bus_osc_support(); 1171 1172 /* 1173 * _PDC control method may load dynamic SSDT tables, 1174 * and we need to install the table handler before that. 1175 */ 1176 status = acpi_install_table_handler(acpi_bus_table_handler, NULL); 1177 1178 acpi_sysfs_init(); 1179 1180 acpi_early_processor_set_pdc(); 1181 1182 /* 1183 * Maybe EC region is required at bus_scan/acpi_get_devices. So it 1184 * is necessary to enable it as early as possible. 1185 */ 1186 acpi_ec_dsdt_probe(); 1187 1188 printk(KERN_INFO PREFIX "Interpreter enabled\n"); 1189 1190 /* Initialize sleep structures */ 1191 acpi_sleep_init(); 1192 1193 /* 1194 * Get the system interrupt model and evaluate \_PIC. 1195 */ 1196 result = acpi_bus_init_irq(); 1197 if (result) 1198 goto error1; 1199 1200 /* 1201 * Register the for all standard device notifications. 1202 */ 1203 status = 1204 acpi_install_notify_handler(ACPI_ROOT_OBJECT, ACPI_SYSTEM_NOTIFY, 1205 &acpi_bus_notify, NULL); 1206 if (ACPI_FAILURE(status)) { 1207 printk(KERN_ERR PREFIX 1208 "Unable to register for device notifications\n"); 1209 goto error1; 1210 } 1211 1212 /* 1213 * Create the top ACPI proc directory 1214 */ 1215 acpi_root_dir = proc_mkdir(ACPI_BUS_FILE_ROOT, NULL); 1216 1217 result = bus_register(&acpi_bus_type); 1218 if (!result) 1219 return 0; 1220 1221 /* Mimic structured exception handling */ 1222 error1: 1223 acpi_terminate(); 1224 return -ENODEV; 1225 } 1226 1227 struct kobject *acpi_kobj; 1228 EXPORT_SYMBOL_GPL(acpi_kobj); 1229 1230 static int __init acpi_init(void) 1231 { 1232 int result; 1233 1234 if (acpi_disabled) { 1235 printk(KERN_INFO PREFIX "Interpreter disabled.\n"); 1236 return -ENODEV; 1237 } 1238 1239 acpi_kobj = kobject_create_and_add("acpi", firmware_kobj); 1240 if (!acpi_kobj) { 1241 printk(KERN_WARNING "%s: kset create error\n", __func__); 1242 acpi_kobj = NULL; 1243 } 1244 1245 result = acpi_bus_init(); 1246 if (result) { 1247 disable_acpi(); 1248 return result; 1249 } 1250 1251 pci_mmcfg_late_init(); 1252 acpi_iort_init(); 1253 acpi_scan_init(); 1254 acpi_ec_init(); 1255 acpi_debugfs_init(); 1256 acpi_sleep_proc_init(); 1257 acpi_wakeup_device_init(); 1258 acpi_debugger_init(); 1259 acpi_setup_sb_notify_handler(); 1260 return 0; 1261 } 1262 1263 subsys_initcall(acpi_init); 1264