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 #include <linux/dmi.h> 39 #endif 40 #include <linux/acpi_iort.h> 41 #include <linux/pci.h> 42 #include <acpi/apei.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 #endif 86 87 /* -------------------------------------------------------------------------- 88 Device Management 89 -------------------------------------------------------------------------- */ 90 91 acpi_status acpi_bus_get_status_handle(acpi_handle handle, 92 unsigned long long *sta) 93 { 94 acpi_status status; 95 96 status = acpi_evaluate_integer(handle, "_STA", NULL, sta); 97 if (ACPI_SUCCESS(status)) 98 return AE_OK; 99 100 if (status == AE_NOT_FOUND) { 101 *sta = ACPI_STA_DEVICE_PRESENT | ACPI_STA_DEVICE_ENABLED | 102 ACPI_STA_DEVICE_UI | ACPI_STA_DEVICE_FUNCTIONING; 103 return AE_OK; 104 } 105 return status; 106 } 107 EXPORT_SYMBOL_GPL(acpi_bus_get_status_handle); 108 109 int acpi_bus_get_status(struct acpi_device *device) 110 { 111 acpi_status status; 112 unsigned long long sta; 113 114 if (acpi_device_always_present(device)) { 115 acpi_set_device_status(device, ACPI_STA_DEFAULT); 116 return 0; 117 } 118 119 /* Battery devices must have their deps met before calling _STA */ 120 if (acpi_device_is_battery(device) && device->dep_unmet) { 121 acpi_set_device_status(device, 0); 122 return 0; 123 } 124 125 status = acpi_bus_get_status_handle(device->handle, &sta); 126 if (ACPI_FAILURE(status)) 127 return -ENODEV; 128 129 acpi_set_device_status(device, sta); 130 131 if (device->status.functional && !device->status.present) { 132 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Device [%s] status [%08x]: " 133 "functional but not present;\n", 134 device->pnp.bus_id, (u32)sta)); 135 } 136 137 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Device [%s] status [%08x]\n", 138 device->pnp.bus_id, (u32)sta)); 139 return 0; 140 } 141 EXPORT_SYMBOL(acpi_bus_get_status); 142 143 void acpi_bus_private_data_handler(acpi_handle handle, 144 void *context) 145 { 146 return; 147 } 148 EXPORT_SYMBOL(acpi_bus_private_data_handler); 149 150 int acpi_bus_attach_private_data(acpi_handle handle, void *data) 151 { 152 acpi_status status; 153 154 status = acpi_attach_data(handle, 155 acpi_bus_private_data_handler, data); 156 if (ACPI_FAILURE(status)) { 157 acpi_handle_debug(handle, "Error attaching device data\n"); 158 return -ENODEV; 159 } 160 161 return 0; 162 } 163 EXPORT_SYMBOL_GPL(acpi_bus_attach_private_data); 164 165 int acpi_bus_get_private_data(acpi_handle handle, void **data) 166 { 167 acpi_status status; 168 169 if (!*data) 170 return -EINVAL; 171 172 status = acpi_get_data(handle, acpi_bus_private_data_handler, data); 173 if (ACPI_FAILURE(status)) { 174 acpi_handle_debug(handle, "No context for object\n"); 175 return -ENODEV; 176 } 177 178 return 0; 179 } 180 EXPORT_SYMBOL_GPL(acpi_bus_get_private_data); 181 182 void acpi_bus_detach_private_data(acpi_handle handle) 183 { 184 acpi_detach_data(handle, acpi_bus_private_data_handler); 185 } 186 EXPORT_SYMBOL_GPL(acpi_bus_detach_private_data); 187 188 static void acpi_print_osc_error(acpi_handle handle, 189 struct acpi_osc_context *context, char *error) 190 { 191 int i; 192 193 acpi_handle_debug(handle, "(%s): %s\n", context->uuid_str, error); 194 195 pr_debug("_OSC request data:"); 196 for (i = 0; i < context->cap.length; i += sizeof(u32)) 197 pr_debug(" %x", *((u32 *)(context->cap.pointer + i))); 198 199 pr_debug("\n"); 200 } 201 202 acpi_status acpi_run_osc(acpi_handle handle, struct acpi_osc_context *context) 203 { 204 acpi_status status; 205 struct acpi_object_list input; 206 union acpi_object in_params[4]; 207 union acpi_object *out_obj; 208 guid_t guid; 209 u32 errors; 210 struct acpi_buffer output = {ACPI_ALLOCATE_BUFFER, NULL}; 211 212 if (!context) 213 return AE_ERROR; 214 if (guid_parse(context->uuid_str, &guid)) 215 return AE_ERROR; 216 context->ret.length = ACPI_ALLOCATE_BUFFER; 217 context->ret.pointer = NULL; 218 219 /* Setting up input parameters */ 220 input.count = 4; 221 input.pointer = in_params; 222 in_params[0].type = ACPI_TYPE_BUFFER; 223 in_params[0].buffer.length = 16; 224 in_params[0].buffer.pointer = (u8 *)&guid; 225 in_params[1].type = ACPI_TYPE_INTEGER; 226 in_params[1].integer.value = context->rev; 227 in_params[2].type = ACPI_TYPE_INTEGER; 228 in_params[2].integer.value = context->cap.length/sizeof(u32); 229 in_params[3].type = ACPI_TYPE_BUFFER; 230 in_params[3].buffer.length = context->cap.length; 231 in_params[3].buffer.pointer = context->cap.pointer; 232 233 status = acpi_evaluate_object(handle, "_OSC", &input, &output); 234 if (ACPI_FAILURE(status)) 235 return status; 236 237 if (!output.length) 238 return AE_NULL_OBJECT; 239 240 out_obj = output.pointer; 241 if (out_obj->type != ACPI_TYPE_BUFFER 242 || out_obj->buffer.length != context->cap.length) { 243 acpi_print_osc_error(handle, context, 244 "_OSC evaluation returned wrong type"); 245 status = AE_TYPE; 246 goto out_kfree; 247 } 248 /* Need to ignore the bit0 in result code */ 249 errors = *((u32 *)out_obj->buffer.pointer) & ~(1 << 0); 250 if (errors) { 251 if (errors & OSC_REQUEST_ERROR) 252 acpi_print_osc_error(handle, context, 253 "_OSC request failed"); 254 if (errors & OSC_INVALID_UUID_ERROR) 255 acpi_print_osc_error(handle, context, 256 "_OSC invalid UUID"); 257 if (errors & OSC_INVALID_REVISION_ERROR) 258 acpi_print_osc_error(handle, context, 259 "_OSC invalid revision"); 260 if (errors & OSC_CAPABILITIES_MASK_ERROR) { 261 if (((u32 *)context->cap.pointer)[OSC_QUERY_DWORD] 262 & OSC_QUERY_ENABLE) 263 goto out_success; 264 status = AE_SUPPORT; 265 goto out_kfree; 266 } 267 status = AE_ERROR; 268 goto out_kfree; 269 } 270 out_success: 271 context->ret.length = out_obj->buffer.length; 272 context->ret.pointer = kmemdup(out_obj->buffer.pointer, 273 context->ret.length, GFP_KERNEL); 274 if (!context->ret.pointer) { 275 status = AE_NO_MEMORY; 276 goto out_kfree; 277 } 278 status = AE_OK; 279 280 out_kfree: 281 kfree(output.pointer); 282 if (status != AE_OK) 283 context->ret.pointer = NULL; 284 return status; 285 } 286 EXPORT_SYMBOL(acpi_run_osc); 287 288 bool osc_sb_apei_support_acked; 289 290 /* 291 * ACPI 6.0 Section 8.4.4.2 Idle State Coordination 292 * OSPM supports platform coordinated low power idle(LPI) states 293 */ 294 bool osc_pc_lpi_support_confirmed; 295 EXPORT_SYMBOL_GPL(osc_pc_lpi_support_confirmed); 296 297 static u8 sb_uuid_str[] = "0811B06E-4A27-44F9-8D60-3CBBC22E7B48"; 298 static void acpi_bus_osc_support(void) 299 { 300 u32 capbuf[2]; 301 struct acpi_osc_context context = { 302 .uuid_str = sb_uuid_str, 303 .rev = 1, 304 .cap.length = 8, 305 .cap.pointer = capbuf, 306 }; 307 acpi_handle handle; 308 309 capbuf[OSC_QUERY_DWORD] = OSC_QUERY_ENABLE; 310 capbuf[OSC_SUPPORT_DWORD] = OSC_SB_PR3_SUPPORT; /* _PR3 is in use */ 311 if (IS_ENABLED(CONFIG_ACPI_PROCESSOR_AGGREGATOR)) 312 capbuf[OSC_SUPPORT_DWORD] |= OSC_SB_PAD_SUPPORT; 313 if (IS_ENABLED(CONFIG_ACPI_PROCESSOR)) 314 capbuf[OSC_SUPPORT_DWORD] |= OSC_SB_PPC_OST_SUPPORT; 315 316 capbuf[OSC_SUPPORT_DWORD] |= OSC_SB_HOTPLUG_OST_SUPPORT; 317 capbuf[OSC_SUPPORT_DWORD] |= OSC_SB_PCLPI_SUPPORT; 318 319 #ifdef CONFIG_X86 320 if (boot_cpu_has(X86_FEATURE_HWP)) { 321 capbuf[OSC_SUPPORT_DWORD] |= OSC_SB_CPC_SUPPORT; 322 capbuf[OSC_SUPPORT_DWORD] |= OSC_SB_CPCV2_SUPPORT; 323 } 324 #endif 325 326 if (IS_ENABLED(CONFIG_SCHED_MC_PRIO)) 327 capbuf[OSC_SUPPORT_DWORD] |= OSC_SB_CPC_DIVERSE_HIGH_SUPPORT; 328 329 if (!ghes_disable) 330 capbuf[OSC_SUPPORT_DWORD] |= OSC_SB_APEI_SUPPORT; 331 if (ACPI_FAILURE(acpi_get_handle(NULL, "\\_SB", &handle))) 332 return; 333 if (ACPI_SUCCESS(acpi_run_osc(handle, &context))) { 334 u32 *capbuf_ret = context.ret.pointer; 335 if (context.ret.length > OSC_SUPPORT_DWORD) { 336 osc_sb_apei_support_acked = 337 capbuf_ret[OSC_SUPPORT_DWORD] & OSC_SB_APEI_SUPPORT; 338 osc_pc_lpi_support_confirmed = 339 capbuf_ret[OSC_SUPPORT_DWORD] & OSC_SB_PCLPI_SUPPORT; 340 } 341 kfree(context.ret.pointer); 342 } 343 /* do we need to check other returned cap? Sounds no */ 344 } 345 346 /* -------------------------------------------------------------------------- 347 Notification Handling 348 -------------------------------------------------------------------------- */ 349 350 /** 351 * acpi_bus_notify 352 * --------------- 353 * Callback for all 'system-level' device notifications (values 0x00-0x7F). 354 */ 355 static void acpi_bus_notify(acpi_handle handle, u32 type, void *data) 356 { 357 struct acpi_device *adev; 358 struct acpi_driver *driver; 359 u32 ost_code = ACPI_OST_SC_NON_SPECIFIC_FAILURE; 360 bool hotplug_event = false; 361 362 switch (type) { 363 case ACPI_NOTIFY_BUS_CHECK: 364 acpi_handle_debug(handle, "ACPI_NOTIFY_BUS_CHECK event\n"); 365 hotplug_event = true; 366 break; 367 368 case ACPI_NOTIFY_DEVICE_CHECK: 369 acpi_handle_debug(handle, "ACPI_NOTIFY_DEVICE_CHECK event\n"); 370 hotplug_event = true; 371 break; 372 373 case ACPI_NOTIFY_DEVICE_WAKE: 374 acpi_handle_debug(handle, "ACPI_NOTIFY_DEVICE_WAKE event\n"); 375 break; 376 377 case ACPI_NOTIFY_EJECT_REQUEST: 378 acpi_handle_debug(handle, "ACPI_NOTIFY_EJECT_REQUEST event\n"); 379 hotplug_event = true; 380 break; 381 382 case ACPI_NOTIFY_DEVICE_CHECK_LIGHT: 383 acpi_handle_debug(handle, "ACPI_NOTIFY_DEVICE_CHECK_LIGHT event\n"); 384 /* TBD: Exactly what does 'light' mean? */ 385 break; 386 387 case ACPI_NOTIFY_FREQUENCY_MISMATCH: 388 acpi_handle_err(handle, "Device cannot be configured due " 389 "to a frequency mismatch\n"); 390 break; 391 392 case ACPI_NOTIFY_BUS_MODE_MISMATCH: 393 acpi_handle_err(handle, "Device cannot be configured due " 394 "to a bus mode mismatch\n"); 395 break; 396 397 case ACPI_NOTIFY_POWER_FAULT: 398 acpi_handle_err(handle, "Device has suffered a power fault\n"); 399 break; 400 401 default: 402 acpi_handle_debug(handle, "Unknown event type 0x%x\n", type); 403 break; 404 } 405 406 adev = acpi_bus_get_acpi_device(handle); 407 if (!adev) 408 goto err; 409 410 driver = adev->driver; 411 if (driver && driver->ops.notify && 412 (driver->flags & ACPI_DRIVER_ALL_NOTIFY_EVENTS)) 413 driver->ops.notify(adev, type); 414 415 if (!hotplug_event) { 416 acpi_bus_put_acpi_device(adev); 417 return; 418 } 419 420 if (ACPI_SUCCESS(acpi_hotplug_schedule(adev, type))) 421 return; 422 423 acpi_bus_put_acpi_device(adev); 424 425 err: 426 acpi_evaluate_ost(handle, type, ost_code, NULL); 427 } 428 429 static void acpi_device_notify(acpi_handle handle, u32 event, void *data) 430 { 431 struct acpi_device *device = data; 432 433 device->driver->ops.notify(device, event); 434 } 435 436 static void acpi_device_notify_fixed(void *data) 437 { 438 struct acpi_device *device = data; 439 440 /* Fixed hardware devices have no handles */ 441 acpi_device_notify(NULL, ACPI_FIXED_HARDWARE_EVENT, device); 442 } 443 444 static u32 acpi_device_fixed_event(void *data) 445 { 446 acpi_os_execute(OSL_NOTIFY_HANDLER, acpi_device_notify_fixed, data); 447 return ACPI_INTERRUPT_HANDLED; 448 } 449 450 static int acpi_device_install_notify_handler(struct acpi_device *device) 451 { 452 acpi_status status; 453 454 if (device->device_type == ACPI_BUS_TYPE_POWER_BUTTON) 455 status = 456 acpi_install_fixed_event_handler(ACPI_EVENT_POWER_BUTTON, 457 acpi_device_fixed_event, 458 device); 459 else if (device->device_type == ACPI_BUS_TYPE_SLEEP_BUTTON) 460 status = 461 acpi_install_fixed_event_handler(ACPI_EVENT_SLEEP_BUTTON, 462 acpi_device_fixed_event, 463 device); 464 else 465 status = acpi_install_notify_handler(device->handle, 466 ACPI_DEVICE_NOTIFY, 467 acpi_device_notify, 468 device); 469 470 if (ACPI_FAILURE(status)) 471 return -EINVAL; 472 return 0; 473 } 474 475 static void acpi_device_remove_notify_handler(struct acpi_device *device) 476 { 477 if (device->device_type == ACPI_BUS_TYPE_POWER_BUTTON) 478 acpi_remove_fixed_event_handler(ACPI_EVENT_POWER_BUTTON, 479 acpi_device_fixed_event); 480 else if (device->device_type == ACPI_BUS_TYPE_SLEEP_BUTTON) 481 acpi_remove_fixed_event_handler(ACPI_EVENT_SLEEP_BUTTON, 482 acpi_device_fixed_event); 483 else 484 acpi_remove_notify_handler(device->handle, ACPI_DEVICE_NOTIFY, 485 acpi_device_notify); 486 } 487 488 /* Handle events targeting \_SB device (at present only graceful shutdown) */ 489 490 #define ACPI_SB_NOTIFY_SHUTDOWN_REQUEST 0x81 491 #define ACPI_SB_INDICATE_INTERVAL 10000 492 493 static void sb_notify_work(struct work_struct *dummy) 494 { 495 acpi_handle sb_handle; 496 497 orderly_poweroff(true); 498 499 /* 500 * After initiating graceful shutdown, the ACPI spec requires OSPM 501 * to evaluate _OST method once every 10seconds to indicate that 502 * the shutdown is in progress 503 */ 504 acpi_get_handle(NULL, "\\_SB", &sb_handle); 505 while (1) { 506 pr_info("Graceful shutdown in progress.\n"); 507 acpi_evaluate_ost(sb_handle, ACPI_OST_EC_OSPM_SHUTDOWN, 508 ACPI_OST_SC_OS_SHUTDOWN_IN_PROGRESS, NULL); 509 msleep(ACPI_SB_INDICATE_INTERVAL); 510 } 511 } 512 513 static void acpi_sb_notify(acpi_handle handle, u32 event, void *data) 514 { 515 static DECLARE_WORK(acpi_sb_work, sb_notify_work); 516 517 if (event == ACPI_SB_NOTIFY_SHUTDOWN_REQUEST) { 518 if (!work_busy(&acpi_sb_work)) 519 schedule_work(&acpi_sb_work); 520 } else 521 pr_warn("event %x is not supported by \\_SB device\n", event); 522 } 523 524 static int __init acpi_setup_sb_notify_handler(void) 525 { 526 acpi_handle sb_handle; 527 528 if (ACPI_FAILURE(acpi_get_handle(NULL, "\\_SB", &sb_handle))) 529 return -ENXIO; 530 531 if (ACPI_FAILURE(acpi_install_notify_handler(sb_handle, ACPI_DEVICE_NOTIFY, 532 acpi_sb_notify, NULL))) 533 return -EINVAL; 534 535 return 0; 536 } 537 538 /* -------------------------------------------------------------------------- 539 Device Matching 540 -------------------------------------------------------------------------- */ 541 542 /** 543 * acpi_get_first_physical_node - Get first physical node of an ACPI device 544 * @adev: ACPI device in question 545 * 546 * Return: First physical node of ACPI device @adev 547 */ 548 struct device *acpi_get_first_physical_node(struct acpi_device *adev) 549 { 550 struct mutex *physical_node_lock = &adev->physical_node_lock; 551 struct device *phys_dev; 552 553 mutex_lock(physical_node_lock); 554 if (list_empty(&adev->physical_node_list)) { 555 phys_dev = NULL; 556 } else { 557 const struct acpi_device_physical_node *node; 558 559 node = list_first_entry(&adev->physical_node_list, 560 struct acpi_device_physical_node, node); 561 562 phys_dev = node->dev; 563 } 564 mutex_unlock(physical_node_lock); 565 return phys_dev; 566 } 567 568 static struct acpi_device *acpi_primary_dev_companion(struct acpi_device *adev, 569 const struct device *dev) 570 { 571 const struct device *phys_dev = acpi_get_first_physical_node(adev); 572 573 return phys_dev && phys_dev == dev ? adev : NULL; 574 } 575 576 /** 577 * acpi_device_is_first_physical_node - Is given dev first physical node 578 * @adev: ACPI companion device 579 * @dev: Physical device to check 580 * 581 * Function checks if given @dev is the first physical devices attached to 582 * the ACPI companion device. This distinction is needed in some cases 583 * where the same companion device is shared between many physical devices. 584 * 585 * Note that the caller have to provide valid @adev pointer. 586 */ 587 bool acpi_device_is_first_physical_node(struct acpi_device *adev, 588 const struct device *dev) 589 { 590 return !!acpi_primary_dev_companion(adev, dev); 591 } 592 593 /* 594 * acpi_companion_match() - Can we match via ACPI companion device 595 * @dev: Device in question 596 * 597 * Check if the given device has an ACPI companion and if that companion has 598 * a valid list of PNP IDs, and if the device is the first (primary) physical 599 * device associated with it. Return the companion pointer if that's the case 600 * or NULL otherwise. 601 * 602 * If multiple physical devices are attached to a single ACPI companion, we need 603 * to be careful. The usage scenario for this kind of relationship is that all 604 * of the physical devices in question use resources provided by the ACPI 605 * companion. A typical case is an MFD device where all the sub-devices share 606 * the parent's ACPI companion. In such cases we can only allow the primary 607 * (first) physical device to be matched with the help of the companion's PNP 608 * IDs. 609 * 610 * Additional physical devices sharing the ACPI companion can still use 611 * resources available from it but they will be matched normally using functions 612 * provided by their bus types (and analogously for their modalias). 613 */ 614 struct acpi_device *acpi_companion_match(const struct device *dev) 615 { 616 struct acpi_device *adev; 617 618 adev = ACPI_COMPANION(dev); 619 if (!adev) 620 return NULL; 621 622 if (list_empty(&adev->pnp.ids)) 623 return NULL; 624 625 return acpi_primary_dev_companion(adev, dev); 626 } 627 628 /** 629 * acpi_of_match_device - Match device object using the "compatible" property. 630 * @adev: ACPI device object to match. 631 * @of_match_table: List of device IDs to match against. 632 * @of_id: OF ID if matched 633 * 634 * If @dev has an ACPI companion which has ACPI_DT_NAMESPACE_HID in its list of 635 * identifiers and a _DSD object with the "compatible" property, use that 636 * property to match against the given list of identifiers. 637 */ 638 static bool acpi_of_match_device(struct acpi_device *adev, 639 const struct of_device_id *of_match_table, 640 const struct of_device_id **of_id) 641 { 642 const union acpi_object *of_compatible, *obj; 643 int i, nval; 644 645 if (!adev) 646 return false; 647 648 of_compatible = adev->data.of_compatible; 649 if (!of_match_table || !of_compatible) 650 return false; 651 652 if (of_compatible->type == ACPI_TYPE_PACKAGE) { 653 nval = of_compatible->package.count; 654 obj = of_compatible->package.elements; 655 } else { /* Must be ACPI_TYPE_STRING. */ 656 nval = 1; 657 obj = of_compatible; 658 } 659 /* Now we can look for the driver DT compatible strings */ 660 for (i = 0; i < nval; i++, obj++) { 661 const struct of_device_id *id; 662 663 for (id = of_match_table; id->compatible[0]; id++) 664 if (!strcasecmp(obj->string.pointer, id->compatible)) { 665 if (of_id) 666 *of_id = id; 667 return true; 668 } 669 } 670 671 return false; 672 } 673 674 static bool acpi_of_modalias(struct acpi_device *adev, 675 char *modalias, size_t len) 676 { 677 const union acpi_object *of_compatible; 678 const union acpi_object *obj; 679 const char *str, *chr; 680 681 of_compatible = adev->data.of_compatible; 682 if (!of_compatible) 683 return false; 684 685 if (of_compatible->type == ACPI_TYPE_PACKAGE) 686 obj = of_compatible->package.elements; 687 else /* Must be ACPI_TYPE_STRING. */ 688 obj = of_compatible; 689 690 str = obj->string.pointer; 691 chr = strchr(str, ','); 692 strlcpy(modalias, chr ? chr + 1 : str, len); 693 694 return true; 695 } 696 697 /** 698 * acpi_set_modalias - Set modalias using "compatible" property or supplied ID 699 * @adev: ACPI device object to match 700 * @default_id: ID string to use as default if no compatible string found 701 * @modalias: Pointer to buffer that modalias value will be copied into 702 * @len: Length of modalias buffer 703 * 704 * This is a counterpart of of_modalias_node() for struct acpi_device objects. 705 * If there is a compatible string for @adev, it will be copied to @modalias 706 * with the vendor prefix stripped; otherwise, @default_id will be used. 707 */ 708 void acpi_set_modalias(struct acpi_device *adev, const char *default_id, 709 char *modalias, size_t len) 710 { 711 if (!acpi_of_modalias(adev, modalias, len)) 712 strlcpy(modalias, default_id, len); 713 } 714 EXPORT_SYMBOL_GPL(acpi_set_modalias); 715 716 static bool __acpi_match_device_cls(const struct acpi_device_id *id, 717 struct acpi_hardware_id *hwid) 718 { 719 int i, msk, byte_shift; 720 char buf[3]; 721 722 if (!id->cls) 723 return false; 724 725 /* Apply class-code bitmask, before checking each class-code byte */ 726 for (i = 1; i <= 3; i++) { 727 byte_shift = 8 * (3 - i); 728 msk = (id->cls_msk >> byte_shift) & 0xFF; 729 if (!msk) 730 continue; 731 732 sprintf(buf, "%02x", (id->cls >> byte_shift) & msk); 733 if (strncmp(buf, &hwid->id[(i - 1) * 2], 2)) 734 return false; 735 } 736 return true; 737 } 738 739 static bool __acpi_match_device(struct acpi_device *device, 740 const struct acpi_device_id *acpi_ids, 741 const struct of_device_id *of_ids, 742 const struct acpi_device_id **acpi_id, 743 const struct of_device_id **of_id) 744 { 745 const struct acpi_device_id *id; 746 struct acpi_hardware_id *hwid; 747 748 /* 749 * If the device is not present, it is unnecessary to load device 750 * driver for it. 751 */ 752 if (!device || !device->status.present) 753 return false; 754 755 list_for_each_entry(hwid, &device->pnp.ids, list) { 756 /* First, check the ACPI/PNP IDs provided by the caller. */ 757 if (acpi_ids) { 758 for (id = acpi_ids; id->id[0] || id->cls; id++) { 759 if (id->id[0] && !strcmp((char *)id->id, hwid->id)) 760 goto out_acpi_match; 761 if (id->cls && __acpi_match_device_cls(id, hwid)) 762 goto out_acpi_match; 763 } 764 } 765 766 /* 767 * Next, check ACPI_DT_NAMESPACE_HID and try to match the 768 * "compatible" property if found. 769 */ 770 if (!strcmp(ACPI_DT_NAMESPACE_HID, hwid->id)) 771 return acpi_of_match_device(device, of_ids, of_id); 772 } 773 return false; 774 775 out_acpi_match: 776 if (acpi_id) 777 *acpi_id = id; 778 return true; 779 } 780 781 /** 782 * acpi_match_device - Match a struct device against a given list of ACPI IDs 783 * @ids: Array of struct acpi_device_id object to match against. 784 * @dev: The device structure to match. 785 * 786 * Check if @dev has a valid ACPI handle and if there is a struct acpi_device 787 * object for that handle and use that object to match against a given list of 788 * device IDs. 789 * 790 * Return a pointer to the first matching ID on success or %NULL on failure. 791 */ 792 const struct acpi_device_id *acpi_match_device(const struct acpi_device_id *ids, 793 const struct device *dev) 794 { 795 const struct acpi_device_id *id = NULL; 796 797 __acpi_match_device(acpi_companion_match(dev), ids, NULL, &id, NULL); 798 return id; 799 } 800 EXPORT_SYMBOL_GPL(acpi_match_device); 801 802 static const void *acpi_of_device_get_match_data(const struct device *dev) 803 { 804 struct acpi_device *adev = ACPI_COMPANION(dev); 805 const struct of_device_id *match = NULL; 806 807 if (!acpi_of_match_device(adev, dev->driver->of_match_table, &match)) 808 return NULL; 809 810 return match->data; 811 } 812 813 const void *acpi_device_get_match_data(const struct device *dev) 814 { 815 const struct acpi_device_id *match; 816 817 if (!dev->driver->acpi_match_table) 818 return acpi_of_device_get_match_data(dev); 819 820 match = acpi_match_device(dev->driver->acpi_match_table, dev); 821 if (!match) 822 return NULL; 823 824 return (const void *)match->driver_data; 825 } 826 EXPORT_SYMBOL_GPL(acpi_device_get_match_data); 827 828 int acpi_match_device_ids(struct acpi_device *device, 829 const struct acpi_device_id *ids) 830 { 831 return __acpi_match_device(device, ids, NULL, NULL, NULL) ? 0 : -ENOENT; 832 } 833 EXPORT_SYMBOL(acpi_match_device_ids); 834 835 bool acpi_driver_match_device(struct device *dev, 836 const struct device_driver *drv) 837 { 838 if (!drv->acpi_match_table) 839 return acpi_of_match_device(ACPI_COMPANION(dev), 840 drv->of_match_table, 841 NULL); 842 843 return __acpi_match_device(acpi_companion_match(dev), 844 drv->acpi_match_table, drv->of_match_table, 845 NULL, NULL); 846 } 847 EXPORT_SYMBOL_GPL(acpi_driver_match_device); 848 849 /* -------------------------------------------------------------------------- 850 ACPI Driver Management 851 -------------------------------------------------------------------------- */ 852 853 /** 854 * acpi_bus_register_driver - register a driver with the ACPI bus 855 * @driver: driver being registered 856 * 857 * Registers a driver with the ACPI bus. Searches the namespace for all 858 * devices that match the driver's criteria and binds. Returns zero for 859 * success or a negative error status for failure. 860 */ 861 int acpi_bus_register_driver(struct acpi_driver *driver) 862 { 863 int ret; 864 865 if (acpi_disabled) 866 return -ENODEV; 867 driver->drv.name = driver->name; 868 driver->drv.bus = &acpi_bus_type; 869 driver->drv.owner = driver->owner; 870 871 ret = driver_register(&driver->drv); 872 return ret; 873 } 874 875 EXPORT_SYMBOL(acpi_bus_register_driver); 876 877 /** 878 * acpi_bus_unregister_driver - unregisters a driver with the ACPI bus 879 * @driver: driver to unregister 880 * 881 * Unregisters a driver with the ACPI bus. Searches the namespace for all 882 * devices that match the driver's criteria and unbinds. 883 */ 884 void acpi_bus_unregister_driver(struct acpi_driver *driver) 885 { 886 driver_unregister(&driver->drv); 887 } 888 889 EXPORT_SYMBOL(acpi_bus_unregister_driver); 890 891 /* -------------------------------------------------------------------------- 892 ACPI Bus operations 893 -------------------------------------------------------------------------- */ 894 895 static int acpi_bus_match(struct device *dev, struct device_driver *drv) 896 { 897 struct acpi_device *acpi_dev = to_acpi_device(dev); 898 struct acpi_driver *acpi_drv = to_acpi_driver(drv); 899 900 return acpi_dev->flags.match_driver 901 && !acpi_match_device_ids(acpi_dev, acpi_drv->ids); 902 } 903 904 static int acpi_device_uevent(struct device *dev, struct kobj_uevent_env *env) 905 { 906 return __acpi_device_uevent_modalias(to_acpi_device(dev), env); 907 } 908 909 static int acpi_device_probe(struct device *dev) 910 { 911 struct acpi_device *acpi_dev = to_acpi_device(dev); 912 struct acpi_driver *acpi_drv = to_acpi_driver(dev->driver); 913 int ret; 914 915 if (acpi_dev->handler && !acpi_is_pnp_device(acpi_dev)) 916 return -EINVAL; 917 918 if (!acpi_drv->ops.add) 919 return -ENOSYS; 920 921 ret = acpi_drv->ops.add(acpi_dev); 922 if (ret) 923 return ret; 924 925 acpi_dev->driver = acpi_drv; 926 ACPI_DEBUG_PRINT((ACPI_DB_INFO, 927 "Driver [%s] successfully bound to device [%s]\n", 928 acpi_drv->name, acpi_dev->pnp.bus_id)); 929 930 if (acpi_drv->ops.notify) { 931 ret = acpi_device_install_notify_handler(acpi_dev); 932 if (ret) { 933 if (acpi_drv->ops.remove) 934 acpi_drv->ops.remove(acpi_dev); 935 936 acpi_dev->driver = NULL; 937 acpi_dev->driver_data = NULL; 938 return ret; 939 } 940 } 941 942 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found driver [%s] for device [%s]\n", 943 acpi_drv->name, acpi_dev->pnp.bus_id)); 944 get_device(dev); 945 return 0; 946 } 947 948 static int acpi_device_remove(struct device *dev) 949 { 950 struct acpi_device *acpi_dev = to_acpi_device(dev); 951 struct acpi_driver *acpi_drv = acpi_dev->driver; 952 953 if (acpi_drv) { 954 if (acpi_drv->ops.notify) 955 acpi_device_remove_notify_handler(acpi_dev); 956 if (acpi_drv->ops.remove) 957 acpi_drv->ops.remove(acpi_dev); 958 } 959 acpi_dev->driver = NULL; 960 acpi_dev->driver_data = NULL; 961 962 put_device(dev); 963 return 0; 964 } 965 966 struct bus_type acpi_bus_type = { 967 .name = "acpi", 968 .match = acpi_bus_match, 969 .probe = acpi_device_probe, 970 .remove = acpi_device_remove, 971 .uevent = acpi_device_uevent, 972 }; 973 974 /* -------------------------------------------------------------------------- 975 Initialization/Cleanup 976 -------------------------------------------------------------------------- */ 977 978 static int __init acpi_bus_init_irq(void) 979 { 980 acpi_status status; 981 char *message = NULL; 982 983 984 /* 985 * Let the system know what interrupt model we are using by 986 * evaluating the \_PIC object, if exists. 987 */ 988 989 switch (acpi_irq_model) { 990 case ACPI_IRQ_MODEL_PIC: 991 message = "PIC"; 992 break; 993 case ACPI_IRQ_MODEL_IOAPIC: 994 message = "IOAPIC"; 995 break; 996 case ACPI_IRQ_MODEL_IOSAPIC: 997 message = "IOSAPIC"; 998 break; 999 case ACPI_IRQ_MODEL_GIC: 1000 message = "GIC"; 1001 break; 1002 case ACPI_IRQ_MODEL_PLATFORM: 1003 message = "platform specific model"; 1004 break; 1005 default: 1006 printk(KERN_WARNING PREFIX "Unknown interrupt routing model\n"); 1007 return -ENODEV; 1008 } 1009 1010 printk(KERN_INFO PREFIX "Using %s for interrupt routing\n", message); 1011 1012 status = acpi_execute_simple_method(NULL, "\\_PIC", acpi_irq_model); 1013 if (ACPI_FAILURE(status) && (status != AE_NOT_FOUND)) { 1014 ACPI_EXCEPTION((AE_INFO, status, "Evaluating _PIC")); 1015 return -ENODEV; 1016 } 1017 1018 return 0; 1019 } 1020 1021 /** 1022 * acpi_early_init - Initialize ACPICA and populate the ACPI namespace. 1023 * 1024 * The ACPI tables are accessible after this, but the handling of events has not 1025 * been initialized and the global lock is not available yet, so AML should not 1026 * be executed at this point. 1027 * 1028 * Doing this before switching the EFI runtime services to virtual mode allows 1029 * the EfiBootServices memory to be freed slightly earlier on boot. 1030 */ 1031 void __init acpi_early_init(void) 1032 { 1033 acpi_status status; 1034 1035 if (acpi_disabled) 1036 return; 1037 1038 printk(KERN_INFO PREFIX "Core revision %08x\n", ACPI_CA_VERSION); 1039 1040 /* enable workarounds, unless strict ACPI spec. compliance */ 1041 if (!acpi_strict) 1042 acpi_gbl_enable_interpreter_slack = TRUE; 1043 1044 acpi_permanent_mmap = true; 1045 1046 #ifdef CONFIG_X86 1047 /* 1048 * If the machine falls into the DMI check table, 1049 * DSDT will be copied to memory. 1050 * Note that calling dmi_check_system() here on other architectures 1051 * would not be OK because only x86 initializes dmi early enough. 1052 * Thankfully only x86 systems need such quirks for now. 1053 */ 1054 dmi_check_system(dsdt_dmi_table); 1055 #endif 1056 1057 status = acpi_reallocate_root_table(); 1058 if (ACPI_FAILURE(status)) { 1059 printk(KERN_ERR PREFIX 1060 "Unable to reallocate ACPI tables\n"); 1061 goto error0; 1062 } 1063 1064 status = acpi_initialize_subsystem(); 1065 if (ACPI_FAILURE(status)) { 1066 printk(KERN_ERR PREFIX 1067 "Unable to initialize the ACPI Interpreter\n"); 1068 goto error0; 1069 } 1070 1071 #ifdef CONFIG_X86 1072 if (!acpi_ioapic) { 1073 /* compatible (0) means level (3) */ 1074 if (!(acpi_sci_flags & ACPI_MADT_TRIGGER_MASK)) { 1075 acpi_sci_flags &= ~ACPI_MADT_TRIGGER_MASK; 1076 acpi_sci_flags |= ACPI_MADT_TRIGGER_LEVEL; 1077 } 1078 /* Set PIC-mode SCI trigger type */ 1079 acpi_pic_sci_set_trigger(acpi_gbl_FADT.sci_interrupt, 1080 (acpi_sci_flags & ACPI_MADT_TRIGGER_MASK) >> 2); 1081 } else { 1082 /* 1083 * now that acpi_gbl_FADT is initialized, 1084 * update it with result from INT_SRC_OVR parsing 1085 */ 1086 acpi_gbl_FADT.sci_interrupt = acpi_sci_override_gsi; 1087 } 1088 #endif 1089 return; 1090 1091 error0: 1092 disable_acpi(); 1093 } 1094 1095 /** 1096 * acpi_subsystem_init - Finalize the early initialization of ACPI. 1097 * 1098 * Switch over the platform to the ACPI mode (if possible). 1099 * 1100 * Doing this too early is generally unsafe, but at the same time it needs to be 1101 * done before all things that really depend on ACPI. The right spot appears to 1102 * be before finalizing the EFI initialization. 1103 */ 1104 void __init acpi_subsystem_init(void) 1105 { 1106 acpi_status status; 1107 1108 if (acpi_disabled) 1109 return; 1110 1111 status = acpi_enable_subsystem(~ACPI_NO_ACPI_ENABLE); 1112 if (ACPI_FAILURE(status)) { 1113 printk(KERN_ERR PREFIX "Unable to enable ACPI\n"); 1114 disable_acpi(); 1115 } else { 1116 /* 1117 * If the system is using ACPI then we can be reasonably 1118 * confident that any regulators are managed by the firmware 1119 * so tell the regulator core it has everything it needs to 1120 * know. 1121 */ 1122 regulator_has_full_constraints(); 1123 } 1124 } 1125 1126 static acpi_status acpi_bus_table_handler(u32 event, void *table, void *context) 1127 { 1128 acpi_scan_table_handler(event, table, context); 1129 1130 return acpi_sysfs_table_handler(event, table, context); 1131 } 1132 1133 static int __init acpi_bus_init(void) 1134 { 1135 int result; 1136 acpi_status status; 1137 1138 acpi_os_initialize1(); 1139 1140 status = acpi_load_tables(); 1141 if (ACPI_FAILURE(status)) { 1142 printk(KERN_ERR PREFIX 1143 "Unable to load the System Description Tables\n"); 1144 goto error1; 1145 } 1146 1147 /* 1148 * ACPI 2.0 requires the EC driver to be loaded and work before the EC 1149 * device is found in the namespace. 1150 * 1151 * This is accomplished by looking for the ECDT table and getting the EC 1152 * parameters out of that. 1153 * 1154 * Do that before calling acpi_initialize_objects() which may trigger EC 1155 * address space accesses. 1156 */ 1157 acpi_ec_ecdt_probe(); 1158 1159 status = acpi_enable_subsystem(ACPI_NO_ACPI_ENABLE); 1160 if (ACPI_FAILURE(status)) { 1161 printk(KERN_ERR PREFIX 1162 "Unable to start the ACPI Interpreter\n"); 1163 goto error1; 1164 } 1165 1166 status = acpi_initialize_objects(ACPI_FULL_INITIALIZATION); 1167 if (ACPI_FAILURE(status)) { 1168 printk(KERN_ERR PREFIX "Unable to initialize ACPI objects\n"); 1169 goto error1; 1170 } 1171 1172 /* Set capability bits for _OSC under processor scope */ 1173 acpi_early_processor_osc(); 1174 1175 /* 1176 * _OSC method may exist in module level code, 1177 * so it must be run after ACPI_FULL_INITIALIZATION 1178 */ 1179 acpi_bus_osc_support(); 1180 1181 /* 1182 * _PDC control method may load dynamic SSDT tables, 1183 * and we need to install the table handler before that. 1184 */ 1185 status = acpi_install_table_handler(acpi_bus_table_handler, NULL); 1186 1187 acpi_sysfs_init(); 1188 1189 acpi_early_processor_set_pdc(); 1190 1191 /* 1192 * Maybe EC region is required at bus_scan/acpi_get_devices. So it 1193 * is necessary to enable it as early as possible. 1194 */ 1195 acpi_ec_dsdt_probe(); 1196 1197 printk(KERN_INFO PREFIX "Interpreter enabled\n"); 1198 1199 /* Initialize sleep structures */ 1200 acpi_sleep_init(); 1201 1202 /* 1203 * Get the system interrupt model and evaluate \_PIC. 1204 */ 1205 result = acpi_bus_init_irq(); 1206 if (result) 1207 goto error1; 1208 1209 /* 1210 * Register the for all standard device notifications. 1211 */ 1212 status = 1213 acpi_install_notify_handler(ACPI_ROOT_OBJECT, ACPI_SYSTEM_NOTIFY, 1214 &acpi_bus_notify, NULL); 1215 if (ACPI_FAILURE(status)) { 1216 printk(KERN_ERR PREFIX 1217 "Unable to register for device notifications\n"); 1218 goto error1; 1219 } 1220 1221 /* 1222 * Create the top ACPI proc directory 1223 */ 1224 acpi_root_dir = proc_mkdir(ACPI_BUS_FILE_ROOT, NULL); 1225 1226 result = bus_register(&acpi_bus_type); 1227 if (!result) 1228 return 0; 1229 1230 /* Mimic structured exception handling */ 1231 error1: 1232 acpi_terminate(); 1233 return -ENODEV; 1234 } 1235 1236 struct kobject *acpi_kobj; 1237 EXPORT_SYMBOL_GPL(acpi_kobj); 1238 1239 static int __init acpi_init(void) 1240 { 1241 int result; 1242 1243 if (acpi_disabled) { 1244 printk(KERN_INFO PREFIX "Interpreter disabled.\n"); 1245 return -ENODEV; 1246 } 1247 1248 acpi_kobj = kobject_create_and_add("acpi", firmware_kobj); 1249 if (!acpi_kobj) { 1250 printk(KERN_WARNING "%s: kset create error\n", __func__); 1251 acpi_kobj = NULL; 1252 } 1253 1254 result = acpi_bus_init(); 1255 if (result) { 1256 disable_acpi(); 1257 return result; 1258 } 1259 1260 pci_mmcfg_late_init(); 1261 acpi_iort_init(); 1262 acpi_scan_init(); 1263 acpi_ec_init(); 1264 acpi_debugfs_init(); 1265 acpi_sleep_proc_init(); 1266 acpi_wakeup_device_init(); 1267 acpi_debugger_init(); 1268 acpi_setup_sb_notify_handler(); 1269 return 0; 1270 } 1271 1272 subsys_initcall(acpi_init); 1273