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_X86 307 if (boot_cpu_has(X86_FEATURE_HWP)) { 308 capbuf[OSC_SUPPORT_DWORD] |= OSC_SB_CPC_SUPPORT; 309 capbuf[OSC_SUPPORT_DWORD] |= OSC_SB_CPCV2_SUPPORT; 310 } 311 #endif 312 313 if (IS_ENABLED(CONFIG_SCHED_MC_PRIO)) 314 capbuf[OSC_SUPPORT_DWORD] |= OSC_SB_CPC_DIVERSE_HIGH_SUPPORT; 315 316 if (!ghes_disable) 317 capbuf[OSC_SUPPORT_DWORD] |= OSC_SB_APEI_SUPPORT; 318 if (ACPI_FAILURE(acpi_get_handle(NULL, "\\_SB", &handle))) 319 return; 320 if (ACPI_SUCCESS(acpi_run_osc(handle, &context))) { 321 u32 *capbuf_ret = context.ret.pointer; 322 if (context.ret.length > OSC_SUPPORT_DWORD) { 323 osc_sb_apei_support_acked = 324 capbuf_ret[OSC_SUPPORT_DWORD] & OSC_SB_APEI_SUPPORT; 325 osc_pc_lpi_support_confirmed = 326 capbuf_ret[OSC_SUPPORT_DWORD] & OSC_SB_PCLPI_SUPPORT; 327 } 328 kfree(context.ret.pointer); 329 } 330 /* do we need to check other returned cap? Sounds no */ 331 } 332 333 /* -------------------------------------------------------------------------- 334 Notification Handling 335 -------------------------------------------------------------------------- */ 336 337 /** 338 * acpi_bus_notify 339 * --------------- 340 * Callback for all 'system-level' device notifications (values 0x00-0x7F). 341 */ 342 static void acpi_bus_notify(acpi_handle handle, u32 type, void *data) 343 { 344 struct acpi_device *adev; 345 struct acpi_driver *driver; 346 u32 ost_code = ACPI_OST_SC_NON_SPECIFIC_FAILURE; 347 bool hotplug_event = false; 348 349 switch (type) { 350 case ACPI_NOTIFY_BUS_CHECK: 351 acpi_handle_debug(handle, "ACPI_NOTIFY_BUS_CHECK event\n"); 352 hotplug_event = true; 353 break; 354 355 case ACPI_NOTIFY_DEVICE_CHECK: 356 acpi_handle_debug(handle, "ACPI_NOTIFY_DEVICE_CHECK event\n"); 357 hotplug_event = true; 358 break; 359 360 case ACPI_NOTIFY_DEVICE_WAKE: 361 acpi_handle_debug(handle, "ACPI_NOTIFY_DEVICE_WAKE event\n"); 362 break; 363 364 case ACPI_NOTIFY_EJECT_REQUEST: 365 acpi_handle_debug(handle, "ACPI_NOTIFY_EJECT_REQUEST event\n"); 366 hotplug_event = true; 367 break; 368 369 case ACPI_NOTIFY_DEVICE_CHECK_LIGHT: 370 acpi_handle_debug(handle, "ACPI_NOTIFY_DEVICE_CHECK_LIGHT event\n"); 371 /* TBD: Exactly what does 'light' mean? */ 372 break; 373 374 case ACPI_NOTIFY_FREQUENCY_MISMATCH: 375 acpi_handle_err(handle, "Device cannot be configured due " 376 "to a frequency mismatch\n"); 377 break; 378 379 case ACPI_NOTIFY_BUS_MODE_MISMATCH: 380 acpi_handle_err(handle, "Device cannot be configured due " 381 "to a bus mode mismatch\n"); 382 break; 383 384 case ACPI_NOTIFY_POWER_FAULT: 385 acpi_handle_err(handle, "Device has suffered a power fault\n"); 386 break; 387 388 default: 389 acpi_handle_debug(handle, "Unknown event type 0x%x\n", type); 390 break; 391 } 392 393 adev = acpi_bus_get_acpi_device(handle); 394 if (!adev) 395 goto err; 396 397 driver = adev->driver; 398 if (driver && driver->ops.notify && 399 (driver->flags & ACPI_DRIVER_ALL_NOTIFY_EVENTS)) 400 driver->ops.notify(adev, type); 401 402 if (!hotplug_event) { 403 acpi_bus_put_acpi_device(adev); 404 return; 405 } 406 407 if (ACPI_SUCCESS(acpi_hotplug_schedule(adev, type))) 408 return; 409 410 acpi_bus_put_acpi_device(adev); 411 412 err: 413 acpi_evaluate_ost(handle, type, ost_code, NULL); 414 } 415 416 static void acpi_device_notify(acpi_handle handle, u32 event, void *data) 417 { 418 struct acpi_device *device = data; 419 420 device->driver->ops.notify(device, event); 421 } 422 423 static void acpi_device_notify_fixed(void *data) 424 { 425 struct acpi_device *device = data; 426 427 /* Fixed hardware devices have no handles */ 428 acpi_device_notify(NULL, ACPI_FIXED_HARDWARE_EVENT, device); 429 } 430 431 static u32 acpi_device_fixed_event(void *data) 432 { 433 acpi_os_execute(OSL_NOTIFY_HANDLER, acpi_device_notify_fixed, data); 434 return ACPI_INTERRUPT_HANDLED; 435 } 436 437 static int acpi_device_install_notify_handler(struct acpi_device *device) 438 { 439 acpi_status status; 440 441 if (device->device_type == ACPI_BUS_TYPE_POWER_BUTTON) 442 status = 443 acpi_install_fixed_event_handler(ACPI_EVENT_POWER_BUTTON, 444 acpi_device_fixed_event, 445 device); 446 else if (device->device_type == ACPI_BUS_TYPE_SLEEP_BUTTON) 447 status = 448 acpi_install_fixed_event_handler(ACPI_EVENT_SLEEP_BUTTON, 449 acpi_device_fixed_event, 450 device); 451 else 452 status = acpi_install_notify_handler(device->handle, 453 ACPI_DEVICE_NOTIFY, 454 acpi_device_notify, 455 device); 456 457 if (ACPI_FAILURE(status)) 458 return -EINVAL; 459 return 0; 460 } 461 462 static void acpi_device_remove_notify_handler(struct acpi_device *device) 463 { 464 if (device->device_type == ACPI_BUS_TYPE_POWER_BUTTON) 465 acpi_remove_fixed_event_handler(ACPI_EVENT_POWER_BUTTON, 466 acpi_device_fixed_event); 467 else if (device->device_type == ACPI_BUS_TYPE_SLEEP_BUTTON) 468 acpi_remove_fixed_event_handler(ACPI_EVENT_SLEEP_BUTTON, 469 acpi_device_fixed_event); 470 else 471 acpi_remove_notify_handler(device->handle, ACPI_DEVICE_NOTIFY, 472 acpi_device_notify); 473 } 474 475 /* Handle events targeting \_SB device (at present only graceful shutdown) */ 476 477 #define ACPI_SB_NOTIFY_SHUTDOWN_REQUEST 0x81 478 #define ACPI_SB_INDICATE_INTERVAL 10000 479 480 static void sb_notify_work(struct work_struct *dummy) 481 { 482 acpi_handle sb_handle; 483 484 orderly_poweroff(true); 485 486 /* 487 * After initiating graceful shutdown, the ACPI spec requires OSPM 488 * to evaluate _OST method once every 10seconds to indicate that 489 * the shutdown is in progress 490 */ 491 acpi_get_handle(NULL, "\\_SB", &sb_handle); 492 while (1) { 493 pr_info("Graceful shutdown in progress.\n"); 494 acpi_evaluate_ost(sb_handle, ACPI_OST_EC_OSPM_SHUTDOWN, 495 ACPI_OST_SC_OS_SHUTDOWN_IN_PROGRESS, NULL); 496 msleep(ACPI_SB_INDICATE_INTERVAL); 497 } 498 } 499 500 static void acpi_sb_notify(acpi_handle handle, u32 event, void *data) 501 { 502 static DECLARE_WORK(acpi_sb_work, sb_notify_work); 503 504 if (event == ACPI_SB_NOTIFY_SHUTDOWN_REQUEST) { 505 if (!work_busy(&acpi_sb_work)) 506 schedule_work(&acpi_sb_work); 507 } else 508 pr_warn("event %x is not supported by \\_SB device\n", event); 509 } 510 511 static int __init acpi_setup_sb_notify_handler(void) 512 { 513 acpi_handle sb_handle; 514 515 if (ACPI_FAILURE(acpi_get_handle(NULL, "\\_SB", &sb_handle))) 516 return -ENXIO; 517 518 if (ACPI_FAILURE(acpi_install_notify_handler(sb_handle, ACPI_DEVICE_NOTIFY, 519 acpi_sb_notify, NULL))) 520 return -EINVAL; 521 522 return 0; 523 } 524 525 /* -------------------------------------------------------------------------- 526 Device Matching 527 -------------------------------------------------------------------------- */ 528 529 /** 530 * acpi_get_first_physical_node - Get first physical node of an ACPI device 531 * @adev: ACPI device in question 532 * 533 * Return: First physical node of ACPI device @adev 534 */ 535 struct device *acpi_get_first_physical_node(struct acpi_device *adev) 536 { 537 struct mutex *physical_node_lock = &adev->physical_node_lock; 538 struct device *phys_dev; 539 540 mutex_lock(physical_node_lock); 541 if (list_empty(&adev->physical_node_list)) { 542 phys_dev = NULL; 543 } else { 544 const struct acpi_device_physical_node *node; 545 546 node = list_first_entry(&adev->physical_node_list, 547 struct acpi_device_physical_node, node); 548 549 phys_dev = node->dev; 550 } 551 mutex_unlock(physical_node_lock); 552 return phys_dev; 553 } 554 555 static struct acpi_device *acpi_primary_dev_companion(struct acpi_device *adev, 556 const struct device *dev) 557 { 558 const struct device *phys_dev = acpi_get_first_physical_node(adev); 559 560 return phys_dev && phys_dev == dev ? adev : NULL; 561 } 562 563 /** 564 * acpi_device_is_first_physical_node - Is given dev first physical node 565 * @adev: ACPI companion device 566 * @dev: Physical device to check 567 * 568 * Function checks if given @dev is the first physical devices attached to 569 * the ACPI companion device. This distinction is needed in some cases 570 * where the same companion device is shared between many physical devices. 571 * 572 * Note that the caller have to provide valid @adev pointer. 573 */ 574 bool acpi_device_is_first_physical_node(struct acpi_device *adev, 575 const struct device *dev) 576 { 577 return !!acpi_primary_dev_companion(adev, dev); 578 } 579 580 /* 581 * acpi_companion_match() - Can we match via ACPI companion device 582 * @dev: Device in question 583 * 584 * Check if the given device has an ACPI companion and if that companion has 585 * a valid list of PNP IDs, and if the device is the first (primary) physical 586 * device associated with it. Return the companion pointer if that's the case 587 * or NULL otherwise. 588 * 589 * If multiple physical devices are attached to a single ACPI companion, we need 590 * to be careful. The usage scenario for this kind of relationship is that all 591 * of the physical devices in question use resources provided by the ACPI 592 * companion. A typical case is an MFD device where all the sub-devices share 593 * the parent's ACPI companion. In such cases we can only allow the primary 594 * (first) physical device to be matched with the help of the companion's PNP 595 * IDs. 596 * 597 * Additional physical devices sharing the ACPI companion can still use 598 * resources available from it but they will be matched normally using functions 599 * provided by their bus types (and analogously for their modalias). 600 */ 601 struct acpi_device *acpi_companion_match(const struct device *dev) 602 { 603 struct acpi_device *adev; 604 605 adev = ACPI_COMPANION(dev); 606 if (!adev) 607 return NULL; 608 609 if (list_empty(&adev->pnp.ids)) 610 return NULL; 611 612 return acpi_primary_dev_companion(adev, dev); 613 } 614 615 /** 616 * acpi_of_match_device - Match device object using the "compatible" property. 617 * @adev: ACPI device object to match. 618 * @of_match_table: List of device IDs to match against. 619 * @of_id: OF ID if matched 620 * 621 * If @dev has an ACPI companion which has ACPI_DT_NAMESPACE_HID in its list of 622 * identifiers and a _DSD object with the "compatible" property, use that 623 * property to match against the given list of identifiers. 624 */ 625 static bool acpi_of_match_device(struct acpi_device *adev, 626 const struct of_device_id *of_match_table, 627 const struct of_device_id **of_id) 628 { 629 const union acpi_object *of_compatible, *obj; 630 int i, nval; 631 632 if (!adev) 633 return false; 634 635 of_compatible = adev->data.of_compatible; 636 if (!of_match_table || !of_compatible) 637 return false; 638 639 if (of_compatible->type == ACPI_TYPE_PACKAGE) { 640 nval = of_compatible->package.count; 641 obj = of_compatible->package.elements; 642 } else { /* Must be ACPI_TYPE_STRING. */ 643 nval = 1; 644 obj = of_compatible; 645 } 646 /* Now we can look for the driver DT compatible strings */ 647 for (i = 0; i < nval; i++, obj++) { 648 const struct of_device_id *id; 649 650 for (id = of_match_table; id->compatible[0]; id++) 651 if (!strcasecmp(obj->string.pointer, id->compatible)) { 652 if (of_id) 653 *of_id = id; 654 return true; 655 } 656 } 657 658 return false; 659 } 660 661 static bool acpi_of_modalias(struct acpi_device *adev, 662 char *modalias, size_t len) 663 { 664 const union acpi_object *of_compatible; 665 const union acpi_object *obj; 666 const char *str, *chr; 667 668 of_compatible = adev->data.of_compatible; 669 if (!of_compatible) 670 return false; 671 672 if (of_compatible->type == ACPI_TYPE_PACKAGE) 673 obj = of_compatible->package.elements; 674 else /* Must be ACPI_TYPE_STRING. */ 675 obj = of_compatible; 676 677 str = obj->string.pointer; 678 chr = strchr(str, ','); 679 strlcpy(modalias, chr ? chr + 1 : str, len); 680 681 return true; 682 } 683 684 /** 685 * acpi_set_modalias - Set modalias using "compatible" property or supplied ID 686 * @adev: ACPI device object to match 687 * @default_id: ID string to use as default if no compatible string found 688 * @modalias: Pointer to buffer that modalias value will be copied into 689 * @len: Length of modalias buffer 690 * 691 * This is a counterpart of of_modalias_node() for struct acpi_device objects. 692 * If there is a compatible string for @adev, it will be copied to @modalias 693 * with the vendor prefix stripped; otherwise, @default_id will be used. 694 */ 695 void acpi_set_modalias(struct acpi_device *adev, const char *default_id, 696 char *modalias, size_t len) 697 { 698 if (!acpi_of_modalias(adev, modalias, len)) 699 strlcpy(modalias, default_id, len); 700 } 701 EXPORT_SYMBOL_GPL(acpi_set_modalias); 702 703 static bool __acpi_match_device_cls(const struct acpi_device_id *id, 704 struct acpi_hardware_id *hwid) 705 { 706 int i, msk, byte_shift; 707 char buf[3]; 708 709 if (!id->cls) 710 return false; 711 712 /* Apply class-code bitmask, before checking each class-code byte */ 713 for (i = 1; i <= 3; i++) { 714 byte_shift = 8 * (3 - i); 715 msk = (id->cls_msk >> byte_shift) & 0xFF; 716 if (!msk) 717 continue; 718 719 sprintf(buf, "%02x", (id->cls >> byte_shift) & msk); 720 if (strncmp(buf, &hwid->id[(i - 1) * 2], 2)) 721 return false; 722 } 723 return true; 724 } 725 726 static bool __acpi_match_device(struct acpi_device *device, 727 const struct acpi_device_id *acpi_ids, 728 const struct of_device_id *of_ids, 729 const struct acpi_device_id **acpi_id, 730 const struct of_device_id **of_id) 731 { 732 const struct acpi_device_id *id; 733 struct acpi_hardware_id *hwid; 734 735 /* 736 * If the device is not present, it is unnecessary to load device 737 * driver for it. 738 */ 739 if (!device || !device->status.present) 740 return false; 741 742 list_for_each_entry(hwid, &device->pnp.ids, list) { 743 /* First, check the ACPI/PNP IDs provided by the caller. */ 744 if (acpi_ids) { 745 for (id = acpi_ids; id->id[0] || id->cls; id++) { 746 if (id->id[0] && !strcmp((char *)id->id, hwid->id)) 747 goto out_acpi_match; 748 if (id->cls && __acpi_match_device_cls(id, hwid)) 749 goto out_acpi_match; 750 } 751 } 752 753 /* 754 * Next, check ACPI_DT_NAMESPACE_HID and try to match the 755 * "compatible" property if found. 756 */ 757 if (!strcmp(ACPI_DT_NAMESPACE_HID, hwid->id)) 758 return acpi_of_match_device(device, of_ids, of_id); 759 } 760 return false; 761 762 out_acpi_match: 763 if (acpi_id) 764 *acpi_id = id; 765 return true; 766 } 767 768 /** 769 * acpi_match_device - Match a struct device against a given list of ACPI IDs 770 * @ids: Array of struct acpi_device_id object to match against. 771 * @dev: The device structure to match. 772 * 773 * Check if @dev has a valid ACPI handle and if there is a struct acpi_device 774 * object for that handle and use that object to match against a given list of 775 * device IDs. 776 * 777 * Return a pointer to the first matching ID on success or %NULL on failure. 778 */ 779 const struct acpi_device_id *acpi_match_device(const struct acpi_device_id *ids, 780 const struct device *dev) 781 { 782 const struct acpi_device_id *id = NULL; 783 784 __acpi_match_device(acpi_companion_match(dev), ids, NULL, &id, NULL); 785 return id; 786 } 787 EXPORT_SYMBOL_GPL(acpi_match_device); 788 789 static const void *acpi_of_device_get_match_data(const struct device *dev) 790 { 791 struct acpi_device *adev = ACPI_COMPANION(dev); 792 const struct of_device_id *match = NULL; 793 794 if (!acpi_of_match_device(adev, dev->driver->of_match_table, &match)) 795 return NULL; 796 797 return match->data; 798 } 799 800 const void *acpi_device_get_match_data(const struct device *dev) 801 { 802 const struct acpi_device_id *match; 803 804 if (!dev->driver->acpi_match_table) 805 return acpi_of_device_get_match_data(dev); 806 807 match = acpi_match_device(dev->driver->acpi_match_table, dev); 808 if (!match) 809 return NULL; 810 811 return (const void *)match->driver_data; 812 } 813 EXPORT_SYMBOL_GPL(acpi_device_get_match_data); 814 815 int acpi_match_device_ids(struct acpi_device *device, 816 const struct acpi_device_id *ids) 817 { 818 return __acpi_match_device(device, ids, NULL, NULL, NULL) ? 0 : -ENOENT; 819 } 820 EXPORT_SYMBOL(acpi_match_device_ids); 821 822 bool acpi_driver_match_device(struct device *dev, 823 const struct device_driver *drv) 824 { 825 if (!drv->acpi_match_table) 826 return acpi_of_match_device(ACPI_COMPANION(dev), 827 drv->of_match_table, 828 NULL); 829 830 return __acpi_match_device(acpi_companion_match(dev), 831 drv->acpi_match_table, drv->of_match_table, 832 NULL, NULL); 833 } 834 EXPORT_SYMBOL_GPL(acpi_driver_match_device); 835 836 /* -------------------------------------------------------------------------- 837 ACPI Driver Management 838 -------------------------------------------------------------------------- */ 839 840 /** 841 * acpi_bus_register_driver - register a driver with the ACPI bus 842 * @driver: driver being registered 843 * 844 * Registers a driver with the ACPI bus. Searches the namespace for all 845 * devices that match the driver's criteria and binds. Returns zero for 846 * success or a negative error status for failure. 847 */ 848 int acpi_bus_register_driver(struct acpi_driver *driver) 849 { 850 int ret; 851 852 if (acpi_disabled) 853 return -ENODEV; 854 driver->drv.name = driver->name; 855 driver->drv.bus = &acpi_bus_type; 856 driver->drv.owner = driver->owner; 857 858 ret = driver_register(&driver->drv); 859 return ret; 860 } 861 862 EXPORT_SYMBOL(acpi_bus_register_driver); 863 864 /** 865 * acpi_bus_unregister_driver - unregisters a driver with the ACPI bus 866 * @driver: driver to unregister 867 * 868 * Unregisters a driver with the ACPI bus. Searches the namespace for all 869 * devices that match the driver's criteria and unbinds. 870 */ 871 void acpi_bus_unregister_driver(struct acpi_driver *driver) 872 { 873 driver_unregister(&driver->drv); 874 } 875 876 EXPORT_SYMBOL(acpi_bus_unregister_driver); 877 878 /* -------------------------------------------------------------------------- 879 ACPI Bus operations 880 -------------------------------------------------------------------------- */ 881 882 static int acpi_bus_match(struct device *dev, struct device_driver *drv) 883 { 884 struct acpi_device *acpi_dev = to_acpi_device(dev); 885 struct acpi_driver *acpi_drv = to_acpi_driver(drv); 886 887 return acpi_dev->flags.match_driver 888 && !acpi_match_device_ids(acpi_dev, acpi_drv->ids); 889 } 890 891 static int acpi_device_uevent(struct device *dev, struct kobj_uevent_env *env) 892 { 893 return __acpi_device_uevent_modalias(to_acpi_device(dev), env); 894 } 895 896 static int acpi_device_probe(struct device *dev) 897 { 898 struct acpi_device *acpi_dev = to_acpi_device(dev); 899 struct acpi_driver *acpi_drv = to_acpi_driver(dev->driver); 900 int ret; 901 902 if (acpi_dev->handler && !acpi_is_pnp_device(acpi_dev)) 903 return -EINVAL; 904 905 if (!acpi_drv->ops.add) 906 return -ENOSYS; 907 908 ret = acpi_drv->ops.add(acpi_dev); 909 if (ret) 910 return ret; 911 912 acpi_dev->driver = acpi_drv; 913 ACPI_DEBUG_PRINT((ACPI_DB_INFO, 914 "Driver [%s] successfully bound to device [%s]\n", 915 acpi_drv->name, acpi_dev->pnp.bus_id)); 916 917 if (acpi_drv->ops.notify) { 918 ret = acpi_device_install_notify_handler(acpi_dev); 919 if (ret) { 920 if (acpi_drv->ops.remove) 921 acpi_drv->ops.remove(acpi_dev); 922 923 acpi_dev->driver = NULL; 924 acpi_dev->driver_data = NULL; 925 return ret; 926 } 927 } 928 929 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found driver [%s] for device [%s]\n", 930 acpi_drv->name, acpi_dev->pnp.bus_id)); 931 get_device(dev); 932 return 0; 933 } 934 935 static int acpi_device_remove(struct device *dev) 936 { 937 struct acpi_device *acpi_dev = to_acpi_device(dev); 938 struct acpi_driver *acpi_drv = acpi_dev->driver; 939 940 if (acpi_drv) { 941 if (acpi_drv->ops.notify) 942 acpi_device_remove_notify_handler(acpi_dev); 943 if (acpi_drv->ops.remove) 944 acpi_drv->ops.remove(acpi_dev); 945 } 946 acpi_dev->driver = NULL; 947 acpi_dev->driver_data = NULL; 948 949 put_device(dev); 950 return 0; 951 } 952 953 struct bus_type acpi_bus_type = { 954 .name = "acpi", 955 .match = acpi_bus_match, 956 .probe = acpi_device_probe, 957 .remove = acpi_device_remove, 958 .uevent = acpi_device_uevent, 959 }; 960 961 /* -------------------------------------------------------------------------- 962 Initialization/Cleanup 963 -------------------------------------------------------------------------- */ 964 965 static int __init acpi_bus_init_irq(void) 966 { 967 acpi_status status; 968 char *message = NULL; 969 970 971 /* 972 * Let the system know what interrupt model we are using by 973 * evaluating the \_PIC object, if exists. 974 */ 975 976 switch (acpi_irq_model) { 977 case ACPI_IRQ_MODEL_PIC: 978 message = "PIC"; 979 break; 980 case ACPI_IRQ_MODEL_IOAPIC: 981 message = "IOAPIC"; 982 break; 983 case ACPI_IRQ_MODEL_IOSAPIC: 984 message = "IOSAPIC"; 985 break; 986 case ACPI_IRQ_MODEL_GIC: 987 message = "GIC"; 988 break; 989 case ACPI_IRQ_MODEL_PLATFORM: 990 message = "platform specific model"; 991 break; 992 default: 993 printk(KERN_WARNING PREFIX "Unknown interrupt routing model\n"); 994 return -ENODEV; 995 } 996 997 printk(KERN_INFO PREFIX "Using %s for interrupt routing\n", message); 998 999 status = acpi_execute_simple_method(NULL, "\\_PIC", acpi_irq_model); 1000 if (ACPI_FAILURE(status) && (status != AE_NOT_FOUND)) { 1001 ACPI_EXCEPTION((AE_INFO, status, "Evaluating _PIC")); 1002 return -ENODEV; 1003 } 1004 1005 return 0; 1006 } 1007 1008 /** 1009 * acpi_early_init - Initialize ACPICA and populate the ACPI namespace. 1010 * 1011 * The ACPI tables are accessible after this, but the handling of events has not 1012 * been initialized and the global lock is not available yet, so AML should not 1013 * be executed at this point. 1014 * 1015 * Doing this before switching the EFI runtime services to virtual mode allows 1016 * the EfiBootServices memory to be freed slightly earlier on boot. 1017 */ 1018 void __init acpi_early_init(void) 1019 { 1020 acpi_status status; 1021 1022 if (acpi_disabled) 1023 return; 1024 1025 printk(KERN_INFO PREFIX "Core revision %08x\n", ACPI_CA_VERSION); 1026 1027 /* enable workarounds, unless strict ACPI spec. compliance */ 1028 if (!acpi_strict) 1029 acpi_gbl_enable_interpreter_slack = TRUE; 1030 1031 acpi_permanent_mmap = true; 1032 1033 #ifdef CONFIG_X86 1034 /* 1035 * If the machine falls into the DMI check table, 1036 * DSDT will be copied to memory. 1037 * Note that calling dmi_check_system() here on other architectures 1038 * would not be OK because only x86 initializes dmi early enough. 1039 * Thankfully only x86 systems need such quirks for now. 1040 */ 1041 dmi_check_system(dsdt_dmi_table); 1042 #endif 1043 1044 status = acpi_reallocate_root_table(); 1045 if (ACPI_FAILURE(status)) { 1046 printk(KERN_ERR PREFIX 1047 "Unable to reallocate ACPI tables\n"); 1048 goto error0; 1049 } 1050 1051 status = acpi_initialize_subsystem(); 1052 if (ACPI_FAILURE(status)) { 1053 printk(KERN_ERR PREFIX 1054 "Unable to initialize the ACPI Interpreter\n"); 1055 goto error0; 1056 } 1057 1058 #ifdef CONFIG_X86 1059 if (!acpi_ioapic) { 1060 /* compatible (0) means level (3) */ 1061 if (!(acpi_sci_flags & ACPI_MADT_TRIGGER_MASK)) { 1062 acpi_sci_flags &= ~ACPI_MADT_TRIGGER_MASK; 1063 acpi_sci_flags |= ACPI_MADT_TRIGGER_LEVEL; 1064 } 1065 /* Set PIC-mode SCI trigger type */ 1066 acpi_pic_sci_set_trigger(acpi_gbl_FADT.sci_interrupt, 1067 (acpi_sci_flags & ACPI_MADT_TRIGGER_MASK) >> 2); 1068 } else { 1069 /* 1070 * now that acpi_gbl_FADT is initialized, 1071 * update it with result from INT_SRC_OVR parsing 1072 */ 1073 acpi_gbl_FADT.sci_interrupt = acpi_sci_override_gsi; 1074 } 1075 #endif 1076 return; 1077 1078 error0: 1079 disable_acpi(); 1080 } 1081 1082 /** 1083 * acpi_subsystem_init - Finalize the early initialization of ACPI. 1084 * 1085 * Switch over the platform to the ACPI mode (if possible). 1086 * 1087 * Doing this too early is generally unsafe, but at the same time it needs to be 1088 * done before all things that really depend on ACPI. The right spot appears to 1089 * be before finalizing the EFI initialization. 1090 */ 1091 void __init acpi_subsystem_init(void) 1092 { 1093 acpi_status status; 1094 1095 if (acpi_disabled) 1096 return; 1097 1098 status = acpi_enable_subsystem(~ACPI_NO_ACPI_ENABLE); 1099 if (ACPI_FAILURE(status)) { 1100 printk(KERN_ERR PREFIX "Unable to enable ACPI\n"); 1101 disable_acpi(); 1102 } else { 1103 /* 1104 * If the system is using ACPI then we can be reasonably 1105 * confident that any regulators are managed by the firmware 1106 * so tell the regulator core it has everything it needs to 1107 * know. 1108 */ 1109 regulator_has_full_constraints(); 1110 } 1111 } 1112 1113 static acpi_status acpi_bus_table_handler(u32 event, void *table, void *context) 1114 { 1115 acpi_scan_table_handler(event, table, context); 1116 1117 return acpi_sysfs_table_handler(event, table, context); 1118 } 1119 1120 static int __init acpi_bus_init(void) 1121 { 1122 int result; 1123 acpi_status status; 1124 1125 acpi_os_initialize1(); 1126 1127 status = acpi_load_tables(); 1128 if (ACPI_FAILURE(status)) { 1129 printk(KERN_ERR PREFIX 1130 "Unable to load the System Description Tables\n"); 1131 goto error1; 1132 } 1133 1134 /* 1135 * ACPI 2.0 requires the EC driver to be loaded and work before the EC 1136 * device is found in the namespace. 1137 * 1138 * This is accomplished by looking for the ECDT table and getting the EC 1139 * parameters out of that. 1140 * 1141 * Do that before calling acpi_initialize_objects() which may trigger EC 1142 * address space accesses. 1143 */ 1144 acpi_ec_ecdt_probe(); 1145 1146 status = acpi_enable_subsystem(ACPI_NO_ACPI_ENABLE); 1147 if (ACPI_FAILURE(status)) { 1148 printk(KERN_ERR PREFIX 1149 "Unable to start the ACPI Interpreter\n"); 1150 goto error1; 1151 } 1152 1153 status = acpi_initialize_objects(ACPI_FULL_INITIALIZATION); 1154 if (ACPI_FAILURE(status)) { 1155 printk(KERN_ERR PREFIX "Unable to initialize ACPI objects\n"); 1156 goto error1; 1157 } 1158 1159 /* Set capability bits for _OSC under processor scope */ 1160 acpi_early_processor_osc(); 1161 1162 /* 1163 * _OSC method may exist in module level code, 1164 * so it must be run after ACPI_FULL_INITIALIZATION 1165 */ 1166 acpi_bus_osc_support(); 1167 1168 /* 1169 * _PDC control method may load dynamic SSDT tables, 1170 * and we need to install the table handler before that. 1171 */ 1172 status = acpi_install_table_handler(acpi_bus_table_handler, NULL); 1173 1174 acpi_sysfs_init(); 1175 1176 acpi_early_processor_set_pdc(); 1177 1178 /* 1179 * Maybe EC region is required at bus_scan/acpi_get_devices. So it 1180 * is necessary to enable it as early as possible. 1181 */ 1182 acpi_ec_dsdt_probe(); 1183 1184 printk(KERN_INFO PREFIX "Interpreter enabled\n"); 1185 1186 /* Initialize sleep structures */ 1187 acpi_sleep_init(); 1188 1189 /* 1190 * Get the system interrupt model and evaluate \_PIC. 1191 */ 1192 result = acpi_bus_init_irq(); 1193 if (result) 1194 goto error1; 1195 1196 /* 1197 * Register the for all standard device notifications. 1198 */ 1199 status = 1200 acpi_install_notify_handler(ACPI_ROOT_OBJECT, ACPI_SYSTEM_NOTIFY, 1201 &acpi_bus_notify, NULL); 1202 if (ACPI_FAILURE(status)) { 1203 printk(KERN_ERR PREFIX 1204 "Unable to register for device notifications\n"); 1205 goto error1; 1206 } 1207 1208 /* 1209 * Create the top ACPI proc directory 1210 */ 1211 acpi_root_dir = proc_mkdir(ACPI_BUS_FILE_ROOT, NULL); 1212 1213 result = bus_register(&acpi_bus_type); 1214 if (!result) 1215 return 0; 1216 1217 /* Mimic structured exception handling */ 1218 error1: 1219 acpi_terminate(); 1220 return -ENODEV; 1221 } 1222 1223 struct kobject *acpi_kobj; 1224 EXPORT_SYMBOL_GPL(acpi_kobj); 1225 1226 static int __init acpi_init(void) 1227 { 1228 int result; 1229 1230 if (acpi_disabled) { 1231 printk(KERN_INFO PREFIX "Interpreter disabled.\n"); 1232 return -ENODEV; 1233 } 1234 1235 acpi_kobj = kobject_create_and_add("acpi", firmware_kobj); 1236 if (!acpi_kobj) { 1237 printk(KERN_WARNING "%s: kset create error\n", __func__); 1238 acpi_kobj = NULL; 1239 } 1240 1241 result = acpi_bus_init(); 1242 if (result) { 1243 disable_acpi(); 1244 return result; 1245 } 1246 1247 pci_mmcfg_late_init(); 1248 acpi_iort_init(); 1249 acpi_scan_init(); 1250 acpi_ec_init(); 1251 acpi_debugfs_init(); 1252 acpi_sleep_proc_init(); 1253 acpi_wakeup_device_init(); 1254 acpi_debugger_init(); 1255 acpi_setup_sb_notify_handler(); 1256 return 0; 1257 } 1258 1259 subsys_initcall(acpi_init); 1260