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