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