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