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 #ifdef CONFIG_X86 34 #include <asm/mpspec.h> 35 #endif 36 #include <linux/pci.h> 37 #include <acpi/apei.h> 38 #include <linux/dmi.h> 39 #include <linux/suspend.h> 40 41 #include "internal.h" 42 43 #define _COMPONENT ACPI_BUS_COMPONENT 44 ACPI_MODULE_NAME("bus"); 45 46 struct acpi_device *acpi_root; 47 struct proc_dir_entry *acpi_root_dir; 48 EXPORT_SYMBOL(acpi_root_dir); 49 50 #ifdef CONFIG_X86 51 #ifdef CONFIG_ACPI_CUSTOM_DSDT 52 static inline int set_copy_dsdt(const struct dmi_system_id *id) 53 { 54 return 0; 55 } 56 #else 57 static int set_copy_dsdt(const struct dmi_system_id *id) 58 { 59 printk(KERN_NOTICE "%s detected - " 60 "force copy of DSDT to local memory\n", id->ident); 61 acpi_gbl_copy_dsdt_locally = 1; 62 return 0; 63 } 64 #endif 65 66 static struct dmi_system_id dsdt_dmi_table[] __initdata = { 67 /* 68 * Invoke DSDT corruption work-around on all Toshiba Satellite. 69 * https://bugzilla.kernel.org/show_bug.cgi?id=14679 70 */ 71 { 72 .callback = set_copy_dsdt, 73 .ident = "TOSHIBA Satellite", 74 .matches = { 75 DMI_MATCH(DMI_SYS_VENDOR, "TOSHIBA"), 76 DMI_MATCH(DMI_PRODUCT_NAME, "Satellite"), 77 }, 78 }, 79 {} 80 }; 81 #else 82 static struct dmi_system_id dsdt_dmi_table[] __initdata = { 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 } 107 108 int acpi_bus_get_status(struct acpi_device *device) 109 { 110 acpi_status status; 111 unsigned long long sta; 112 113 status = acpi_bus_get_status_handle(device->handle, &sta); 114 if (ACPI_FAILURE(status)) 115 return -ENODEV; 116 117 acpi_set_device_status(device, sta); 118 119 if (device->status.functional && !device->status.present) { 120 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Device [%s] status [%08x]: " 121 "functional but not present;\n", 122 device->pnp.bus_id, (u32)sta)); 123 } 124 125 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Device [%s] status [%08x]\n", 126 device->pnp.bus_id, (u32)sta)); 127 return 0; 128 } 129 EXPORT_SYMBOL(acpi_bus_get_status); 130 131 void acpi_bus_private_data_handler(acpi_handle handle, 132 void *context) 133 { 134 return; 135 } 136 EXPORT_SYMBOL(acpi_bus_private_data_handler); 137 138 int acpi_bus_attach_private_data(acpi_handle handle, void *data) 139 { 140 acpi_status status; 141 142 status = acpi_attach_data(handle, 143 acpi_bus_private_data_handler, data); 144 if (ACPI_FAILURE(status)) { 145 acpi_handle_debug(handle, "Error attaching device data\n"); 146 return -ENODEV; 147 } 148 149 return 0; 150 } 151 EXPORT_SYMBOL_GPL(acpi_bus_attach_private_data); 152 153 int acpi_bus_get_private_data(acpi_handle handle, void **data) 154 { 155 acpi_status status; 156 157 if (!*data) 158 return -EINVAL; 159 160 status = acpi_get_data(handle, acpi_bus_private_data_handler, data); 161 if (ACPI_FAILURE(status)) { 162 acpi_handle_debug(handle, "No context for object\n"); 163 return -ENODEV; 164 } 165 166 return 0; 167 } 168 EXPORT_SYMBOL_GPL(acpi_bus_get_private_data); 169 170 void acpi_bus_detach_private_data(acpi_handle handle) 171 { 172 acpi_detach_data(handle, acpi_bus_private_data_handler); 173 } 174 EXPORT_SYMBOL_GPL(acpi_bus_detach_private_data); 175 176 static void acpi_print_osc_error(acpi_handle handle, 177 struct acpi_osc_context *context, char *error) 178 { 179 struct acpi_buffer buffer = {ACPI_ALLOCATE_BUFFER}; 180 int i; 181 182 if (ACPI_FAILURE(acpi_get_name(handle, ACPI_FULL_PATHNAME, &buffer))) 183 printk(KERN_DEBUG "%s\n", error); 184 else { 185 printk(KERN_DEBUG "%s:%s\n", (char *)buffer.pointer, error); 186 kfree(buffer.pointer); 187 } 188 printk(KERN_DEBUG"_OSC request data:"); 189 for (i = 0; i < context->cap.length; i += sizeof(u32)) 190 printk("%x ", *((u32 *)(context->cap.pointer + i))); 191 printk("\n"); 192 } 193 194 acpi_status acpi_str_to_uuid(char *str, u8 *uuid) 195 { 196 int i; 197 static int opc_map_to_uuid[16] = {6, 4, 2, 0, 11, 9, 16, 14, 19, 21, 198 24, 26, 28, 30, 32, 34}; 199 200 if (strlen(str) != 36) 201 return AE_BAD_PARAMETER; 202 for (i = 0; i < 36; i++) { 203 if (i == 8 || i == 13 || i == 18 || i == 23) { 204 if (str[i] != '-') 205 return AE_BAD_PARAMETER; 206 } else if (!isxdigit(str[i])) 207 return AE_BAD_PARAMETER; 208 } 209 for (i = 0; i < 16; i++) { 210 uuid[i] = hex_to_bin(str[opc_map_to_uuid[i]]) << 4; 211 uuid[i] |= hex_to_bin(str[opc_map_to_uuid[i] + 1]); 212 } 213 return AE_OK; 214 } 215 EXPORT_SYMBOL_GPL(acpi_str_to_uuid); 216 217 acpi_status acpi_run_osc(acpi_handle handle, struct acpi_osc_context *context) 218 { 219 acpi_status status; 220 struct acpi_object_list input; 221 union acpi_object in_params[4]; 222 union acpi_object *out_obj; 223 u8 uuid[16]; 224 u32 errors; 225 struct acpi_buffer output = {ACPI_ALLOCATE_BUFFER, NULL}; 226 227 if (!context) 228 return AE_ERROR; 229 if (ACPI_FAILURE(acpi_str_to_uuid(context->uuid_str, uuid))) 230 return AE_ERROR; 231 context->ret.length = ACPI_ALLOCATE_BUFFER; 232 context->ret.pointer = NULL; 233 234 /* Setting up input parameters */ 235 input.count = 4; 236 input.pointer = in_params; 237 in_params[0].type = ACPI_TYPE_BUFFER; 238 in_params[0].buffer.length = 16; 239 in_params[0].buffer.pointer = uuid; 240 in_params[1].type = ACPI_TYPE_INTEGER; 241 in_params[1].integer.value = context->rev; 242 in_params[2].type = ACPI_TYPE_INTEGER; 243 in_params[2].integer.value = context->cap.length/sizeof(u32); 244 in_params[3].type = ACPI_TYPE_BUFFER; 245 in_params[3].buffer.length = context->cap.length; 246 in_params[3].buffer.pointer = context->cap.pointer; 247 248 status = acpi_evaluate_object(handle, "_OSC", &input, &output); 249 if (ACPI_FAILURE(status)) 250 return status; 251 252 if (!output.length) 253 return AE_NULL_OBJECT; 254 255 out_obj = output.pointer; 256 if (out_obj->type != ACPI_TYPE_BUFFER 257 || out_obj->buffer.length != context->cap.length) { 258 acpi_print_osc_error(handle, context, 259 "_OSC evaluation returned wrong type"); 260 status = AE_TYPE; 261 goto out_kfree; 262 } 263 /* Need to ignore the bit0 in result code */ 264 errors = *((u32 *)out_obj->buffer.pointer) & ~(1 << 0); 265 if (errors) { 266 if (errors & OSC_REQUEST_ERROR) 267 acpi_print_osc_error(handle, context, 268 "_OSC request failed"); 269 if (errors & OSC_INVALID_UUID_ERROR) 270 acpi_print_osc_error(handle, context, 271 "_OSC invalid UUID"); 272 if (errors & OSC_INVALID_REVISION_ERROR) 273 acpi_print_osc_error(handle, context, 274 "_OSC invalid revision"); 275 if (errors & OSC_CAPABILITIES_MASK_ERROR) { 276 if (((u32 *)context->cap.pointer)[OSC_QUERY_DWORD] 277 & OSC_QUERY_ENABLE) 278 goto out_success; 279 status = AE_SUPPORT; 280 goto out_kfree; 281 } 282 status = AE_ERROR; 283 goto out_kfree; 284 } 285 out_success: 286 context->ret.length = out_obj->buffer.length; 287 context->ret.pointer = kmemdup(out_obj->buffer.pointer, 288 context->ret.length, GFP_KERNEL); 289 if (!context->ret.pointer) { 290 status = AE_NO_MEMORY; 291 goto out_kfree; 292 } 293 status = AE_OK; 294 295 out_kfree: 296 kfree(output.pointer); 297 if (status != AE_OK) 298 context->ret.pointer = NULL; 299 return status; 300 } 301 EXPORT_SYMBOL(acpi_run_osc); 302 303 bool osc_sb_apei_support_acked; 304 static u8 sb_uuid_str[] = "0811B06E-4A27-44F9-8D60-3CBBC22E7B48"; 305 static void acpi_bus_osc_support(void) 306 { 307 u32 capbuf[2]; 308 struct acpi_osc_context context = { 309 .uuid_str = sb_uuid_str, 310 .rev = 1, 311 .cap.length = 8, 312 .cap.pointer = capbuf, 313 }; 314 acpi_handle handle; 315 316 capbuf[OSC_QUERY_DWORD] = OSC_QUERY_ENABLE; 317 capbuf[OSC_SUPPORT_DWORD] = OSC_SB_PR3_SUPPORT; /* _PR3 is in use */ 318 if (IS_ENABLED(CONFIG_ACPI_PROCESSOR_AGGREGATOR)) 319 capbuf[OSC_SUPPORT_DWORD] |= OSC_SB_PAD_SUPPORT; 320 if (IS_ENABLED(CONFIG_ACPI_PROCESSOR)) 321 capbuf[OSC_SUPPORT_DWORD] |= OSC_SB_PPC_OST_SUPPORT; 322 323 capbuf[OSC_SUPPORT_DWORD] |= OSC_SB_HOTPLUG_OST_SUPPORT; 324 325 if (!ghes_disable) 326 capbuf[OSC_SUPPORT_DWORD] |= OSC_SB_APEI_SUPPORT; 327 if (ACPI_FAILURE(acpi_get_handle(NULL, "\\_SB", &handle))) 328 return; 329 if (ACPI_SUCCESS(acpi_run_osc(handle, &context))) { 330 u32 *capbuf_ret = context.ret.pointer; 331 if (context.ret.length > OSC_SUPPORT_DWORD) 332 osc_sb_apei_support_acked = 333 capbuf_ret[OSC_SUPPORT_DWORD] & OSC_SB_APEI_SUPPORT; 334 kfree(context.ret.pointer); 335 } 336 /* do we need to check other returned cap? Sounds no */ 337 } 338 339 /* -------------------------------------------------------------------------- 340 Notification Handling 341 -------------------------------------------------------------------------- */ 342 343 /** 344 * acpi_bus_notify 345 * --------------- 346 * Callback for all 'system-level' device notifications (values 0x00-0x7F). 347 */ 348 static void acpi_bus_notify(acpi_handle handle, u32 type, void *data) 349 { 350 struct acpi_device *adev; 351 struct acpi_driver *driver; 352 u32 ost_code = ACPI_OST_SC_NON_SPECIFIC_FAILURE; 353 bool hotplug_event = false; 354 355 switch (type) { 356 case ACPI_NOTIFY_BUS_CHECK: 357 acpi_handle_debug(handle, "ACPI_NOTIFY_BUS_CHECK event\n"); 358 hotplug_event = true; 359 break; 360 361 case ACPI_NOTIFY_DEVICE_CHECK: 362 acpi_handle_debug(handle, "ACPI_NOTIFY_DEVICE_CHECK event\n"); 363 hotplug_event = true; 364 break; 365 366 case ACPI_NOTIFY_DEVICE_WAKE: 367 acpi_handle_debug(handle, "ACPI_NOTIFY_DEVICE_WAKE event\n"); 368 break; 369 370 case ACPI_NOTIFY_EJECT_REQUEST: 371 acpi_handle_debug(handle, "ACPI_NOTIFY_EJECT_REQUEST event\n"); 372 hotplug_event = true; 373 break; 374 375 case ACPI_NOTIFY_DEVICE_CHECK_LIGHT: 376 acpi_handle_debug(handle, "ACPI_NOTIFY_DEVICE_CHECK_LIGHT event\n"); 377 /* TBD: Exactly what does 'light' mean? */ 378 break; 379 380 case ACPI_NOTIFY_FREQUENCY_MISMATCH: 381 acpi_handle_err(handle, "Device cannot be configured due " 382 "to a frequency mismatch\n"); 383 break; 384 385 case ACPI_NOTIFY_BUS_MODE_MISMATCH: 386 acpi_handle_err(handle, "Device cannot be configured due " 387 "to a bus mode mismatch\n"); 388 break; 389 390 case ACPI_NOTIFY_POWER_FAULT: 391 acpi_handle_err(handle, "Device has suffered a power fault\n"); 392 break; 393 394 default: 395 acpi_handle_debug(handle, "Unknown event type 0x%x\n", type); 396 break; 397 } 398 399 adev = acpi_bus_get_acpi_device(handle); 400 if (!adev) 401 goto err; 402 403 driver = adev->driver; 404 if (driver && driver->ops.notify && 405 (driver->flags & ACPI_DRIVER_ALL_NOTIFY_EVENTS)) 406 driver->ops.notify(adev, type); 407 408 if (hotplug_event && ACPI_SUCCESS(acpi_hotplug_schedule(adev, type))) 409 return; 410 411 acpi_bus_put_acpi_device(adev); 412 return; 413 414 err: 415 acpi_evaluate_ost(handle, type, ost_code, NULL); 416 } 417 418 static void acpi_device_notify(acpi_handle handle, u32 event, void *data) 419 { 420 struct acpi_device *device = data; 421 422 device->driver->ops.notify(device, event); 423 } 424 425 static void acpi_device_notify_fixed(void *data) 426 { 427 struct acpi_device *device = data; 428 429 /* Fixed hardware devices have no handles */ 430 acpi_device_notify(NULL, ACPI_FIXED_HARDWARE_EVENT, device); 431 } 432 433 static u32 acpi_device_fixed_event(void *data) 434 { 435 acpi_os_execute(OSL_NOTIFY_HANDLER, acpi_device_notify_fixed, data); 436 return ACPI_INTERRUPT_HANDLED; 437 } 438 439 static int acpi_device_install_notify_handler(struct acpi_device *device) 440 { 441 acpi_status status; 442 443 if (device->device_type == ACPI_BUS_TYPE_POWER_BUTTON) 444 status = 445 acpi_install_fixed_event_handler(ACPI_EVENT_POWER_BUTTON, 446 acpi_device_fixed_event, 447 device); 448 else if (device->device_type == ACPI_BUS_TYPE_SLEEP_BUTTON) 449 status = 450 acpi_install_fixed_event_handler(ACPI_EVENT_SLEEP_BUTTON, 451 acpi_device_fixed_event, 452 device); 453 else 454 status = acpi_install_notify_handler(device->handle, 455 ACPI_DEVICE_NOTIFY, 456 acpi_device_notify, 457 device); 458 459 if (ACPI_FAILURE(status)) 460 return -EINVAL; 461 return 0; 462 } 463 464 static void acpi_device_remove_notify_handler(struct acpi_device *device) 465 { 466 if (device->device_type == ACPI_BUS_TYPE_POWER_BUTTON) 467 acpi_remove_fixed_event_handler(ACPI_EVENT_POWER_BUTTON, 468 acpi_device_fixed_event); 469 else if (device->device_type == ACPI_BUS_TYPE_SLEEP_BUTTON) 470 acpi_remove_fixed_event_handler(ACPI_EVENT_SLEEP_BUTTON, 471 acpi_device_fixed_event); 472 else 473 acpi_remove_notify_handler(device->handle, ACPI_DEVICE_NOTIFY, 474 acpi_device_notify); 475 } 476 477 /* -------------------------------------------------------------------------- 478 Device Matching 479 -------------------------------------------------------------------------- */ 480 481 static struct acpi_device *acpi_primary_dev_companion(struct acpi_device *adev, 482 const struct device *dev) 483 { 484 struct mutex *physical_node_lock = &adev->physical_node_lock; 485 486 mutex_lock(physical_node_lock); 487 if (list_empty(&adev->physical_node_list)) { 488 adev = NULL; 489 } else { 490 const struct acpi_device_physical_node *node; 491 492 node = list_first_entry(&adev->physical_node_list, 493 struct acpi_device_physical_node, node); 494 if (node->dev != dev) 495 adev = NULL; 496 } 497 mutex_unlock(physical_node_lock); 498 return adev; 499 } 500 501 /** 502 * acpi_device_is_first_physical_node - Is given dev first physical node 503 * @adev: ACPI companion device 504 * @dev: Physical device to check 505 * 506 * Function checks if given @dev is the first physical devices attached to 507 * the ACPI companion device. This distinction is needed in some cases 508 * where the same companion device is shared between many physical devices. 509 * 510 * Note that the caller have to provide valid @adev pointer. 511 */ 512 bool acpi_device_is_first_physical_node(struct acpi_device *adev, 513 const struct device *dev) 514 { 515 return !!acpi_primary_dev_companion(adev, dev); 516 } 517 518 /* 519 * acpi_companion_match() - Can we match via ACPI companion device 520 * @dev: Device in question 521 * 522 * Check if the given device has an ACPI companion and if that companion has 523 * a valid list of PNP IDs, and if the device is the first (primary) physical 524 * device associated with it. Return the companion pointer if that's the case 525 * or NULL otherwise. 526 * 527 * If multiple physical devices are attached to a single ACPI companion, we need 528 * to be careful. The usage scenario for this kind of relationship is that all 529 * of the physical devices in question use resources provided by the ACPI 530 * companion. A typical case is an MFD device where all the sub-devices share 531 * the parent's ACPI companion. In such cases we can only allow the primary 532 * (first) physical device to be matched with the help of the companion's PNP 533 * IDs. 534 * 535 * Additional physical devices sharing the ACPI companion can still use 536 * resources available from it but they will be matched normally using functions 537 * provided by their bus types (and analogously for their modalias). 538 */ 539 struct acpi_device *acpi_companion_match(const struct device *dev) 540 { 541 struct acpi_device *adev; 542 543 adev = ACPI_COMPANION(dev); 544 if (!adev) 545 return NULL; 546 547 if (list_empty(&adev->pnp.ids)) 548 return NULL; 549 550 return acpi_primary_dev_companion(adev, dev); 551 } 552 553 /** 554 * acpi_of_match_device - Match device object using the "compatible" property. 555 * @adev: ACPI device object to match. 556 * @of_match_table: List of device IDs to match against. 557 * 558 * If @dev has an ACPI companion which has ACPI_DT_NAMESPACE_HID in its list of 559 * identifiers and a _DSD object with the "compatible" property, use that 560 * property to match against the given list of identifiers. 561 */ 562 static bool acpi_of_match_device(struct acpi_device *adev, 563 const struct of_device_id *of_match_table) 564 { 565 const union acpi_object *of_compatible, *obj; 566 int i, nval; 567 568 if (!adev) 569 return false; 570 571 of_compatible = adev->data.of_compatible; 572 if (!of_match_table || !of_compatible) 573 return false; 574 575 if (of_compatible->type == ACPI_TYPE_PACKAGE) { 576 nval = of_compatible->package.count; 577 obj = of_compatible->package.elements; 578 } else { /* Must be ACPI_TYPE_STRING. */ 579 nval = 1; 580 obj = of_compatible; 581 } 582 /* Now we can look for the driver DT compatible strings */ 583 for (i = 0; i < nval; i++, obj++) { 584 const struct of_device_id *id; 585 586 for (id = of_match_table; id->compatible[0]; id++) 587 if (!strcasecmp(obj->string.pointer, id->compatible)) 588 return true; 589 } 590 591 return false; 592 } 593 594 static bool __acpi_match_device_cls(const struct acpi_device_id *id, 595 struct acpi_hardware_id *hwid) 596 { 597 int i, msk, byte_shift; 598 char buf[3]; 599 600 if (!id->cls) 601 return false; 602 603 /* Apply class-code bitmask, before checking each class-code byte */ 604 for (i = 1; i <= 3; i++) { 605 byte_shift = 8 * (3 - i); 606 msk = (id->cls_msk >> byte_shift) & 0xFF; 607 if (!msk) 608 continue; 609 610 sprintf(buf, "%02x", (id->cls >> byte_shift) & msk); 611 if (strncmp(buf, &hwid->id[(i - 1) * 2], 2)) 612 return false; 613 } 614 return true; 615 } 616 617 static const struct acpi_device_id *__acpi_match_device( 618 struct acpi_device *device, 619 const struct acpi_device_id *ids, 620 const struct of_device_id *of_ids) 621 { 622 const struct acpi_device_id *id; 623 struct acpi_hardware_id *hwid; 624 625 /* 626 * If the device is not present, it is unnecessary to load device 627 * driver for it. 628 */ 629 if (!device || !device->status.present) 630 return NULL; 631 632 list_for_each_entry(hwid, &device->pnp.ids, list) { 633 /* First, check the ACPI/PNP IDs provided by the caller. */ 634 for (id = ids; id->id[0] || id->cls; id++) { 635 if (id->id[0] && !strcmp((char *) id->id, hwid->id)) 636 return id; 637 else if (id->cls && __acpi_match_device_cls(id, hwid)) 638 return id; 639 } 640 641 /* 642 * Next, check ACPI_DT_NAMESPACE_HID and try to match the 643 * "compatible" property if found. 644 * 645 * The id returned by the below is not valid, but the only 646 * caller passing non-NULL of_ids here is only interested in 647 * whether or not the return value is NULL. 648 */ 649 if (!strcmp(ACPI_DT_NAMESPACE_HID, hwid->id) 650 && acpi_of_match_device(device, of_ids)) 651 return id; 652 } 653 return NULL; 654 } 655 656 /** 657 * acpi_match_device - Match a struct device against a given list of ACPI IDs 658 * @ids: Array of struct acpi_device_id object to match against. 659 * @dev: The device structure to match. 660 * 661 * Check if @dev has a valid ACPI handle and if there is a struct acpi_device 662 * object for that handle and use that object to match against a given list of 663 * device IDs. 664 * 665 * Return a pointer to the first matching ID on success or %NULL on failure. 666 */ 667 const struct acpi_device_id *acpi_match_device(const struct acpi_device_id *ids, 668 const struct device *dev) 669 { 670 return __acpi_match_device(acpi_companion_match(dev), ids, NULL); 671 } 672 EXPORT_SYMBOL_GPL(acpi_match_device); 673 674 int acpi_match_device_ids(struct acpi_device *device, 675 const struct acpi_device_id *ids) 676 { 677 return __acpi_match_device(device, ids, NULL) ? 0 : -ENOENT; 678 } 679 EXPORT_SYMBOL(acpi_match_device_ids); 680 681 bool acpi_driver_match_device(struct device *dev, 682 const struct device_driver *drv) 683 { 684 if (!drv->acpi_match_table) 685 return acpi_of_match_device(ACPI_COMPANION(dev), 686 drv->of_match_table); 687 688 return !!__acpi_match_device(acpi_companion_match(dev), 689 drv->acpi_match_table, drv->of_match_table); 690 } 691 EXPORT_SYMBOL_GPL(acpi_driver_match_device); 692 693 /* -------------------------------------------------------------------------- 694 ACPI Driver Management 695 -------------------------------------------------------------------------- */ 696 697 /** 698 * acpi_bus_register_driver - register a driver with the ACPI bus 699 * @driver: driver being registered 700 * 701 * Registers a driver with the ACPI bus. Searches the namespace for all 702 * devices that match the driver's criteria and binds. Returns zero for 703 * success or a negative error status for failure. 704 */ 705 int acpi_bus_register_driver(struct acpi_driver *driver) 706 { 707 int ret; 708 709 if (acpi_disabled) 710 return -ENODEV; 711 driver->drv.name = driver->name; 712 driver->drv.bus = &acpi_bus_type; 713 driver->drv.owner = driver->owner; 714 715 ret = driver_register(&driver->drv); 716 return ret; 717 } 718 719 EXPORT_SYMBOL(acpi_bus_register_driver); 720 721 /** 722 * acpi_bus_unregister_driver - unregisters a driver with the ACPI bus 723 * @driver: driver to unregister 724 * 725 * Unregisters a driver with the ACPI bus. Searches the namespace for all 726 * devices that match the driver's criteria and unbinds. 727 */ 728 void acpi_bus_unregister_driver(struct acpi_driver *driver) 729 { 730 driver_unregister(&driver->drv); 731 } 732 733 EXPORT_SYMBOL(acpi_bus_unregister_driver); 734 735 /* -------------------------------------------------------------------------- 736 ACPI Bus operations 737 -------------------------------------------------------------------------- */ 738 739 static int acpi_bus_match(struct device *dev, struct device_driver *drv) 740 { 741 struct acpi_device *acpi_dev = to_acpi_device(dev); 742 struct acpi_driver *acpi_drv = to_acpi_driver(drv); 743 744 return acpi_dev->flags.match_driver 745 && !acpi_match_device_ids(acpi_dev, acpi_drv->ids); 746 } 747 748 static int acpi_device_uevent(struct device *dev, struct kobj_uevent_env *env) 749 { 750 return __acpi_device_uevent_modalias(to_acpi_device(dev), env); 751 } 752 753 static int acpi_device_probe(struct device *dev) 754 { 755 struct acpi_device *acpi_dev = to_acpi_device(dev); 756 struct acpi_driver *acpi_drv = to_acpi_driver(dev->driver); 757 int ret; 758 759 if (acpi_dev->handler && !acpi_is_pnp_device(acpi_dev)) 760 return -EINVAL; 761 762 if (!acpi_drv->ops.add) 763 return -ENOSYS; 764 765 ret = acpi_drv->ops.add(acpi_dev); 766 if (ret) 767 return ret; 768 769 acpi_dev->driver = acpi_drv; 770 ACPI_DEBUG_PRINT((ACPI_DB_INFO, 771 "Driver [%s] successfully bound to device [%s]\n", 772 acpi_drv->name, acpi_dev->pnp.bus_id)); 773 774 if (acpi_drv->ops.notify) { 775 ret = acpi_device_install_notify_handler(acpi_dev); 776 if (ret) { 777 if (acpi_drv->ops.remove) 778 acpi_drv->ops.remove(acpi_dev); 779 780 acpi_dev->driver = NULL; 781 acpi_dev->driver_data = NULL; 782 return ret; 783 } 784 } 785 786 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found driver [%s] for device [%s]\n", 787 acpi_drv->name, acpi_dev->pnp.bus_id)); 788 get_device(dev); 789 return 0; 790 } 791 792 static int acpi_device_remove(struct device * dev) 793 { 794 struct acpi_device *acpi_dev = to_acpi_device(dev); 795 struct acpi_driver *acpi_drv = acpi_dev->driver; 796 797 if (acpi_drv) { 798 if (acpi_drv->ops.notify) 799 acpi_device_remove_notify_handler(acpi_dev); 800 if (acpi_drv->ops.remove) 801 acpi_drv->ops.remove(acpi_dev); 802 } 803 acpi_dev->driver = NULL; 804 acpi_dev->driver_data = NULL; 805 806 put_device(dev); 807 return 0; 808 } 809 810 struct bus_type acpi_bus_type = { 811 .name = "acpi", 812 .match = acpi_bus_match, 813 .probe = acpi_device_probe, 814 .remove = acpi_device_remove, 815 .uevent = acpi_device_uevent, 816 }; 817 818 /* -------------------------------------------------------------------------- 819 Initialization/Cleanup 820 -------------------------------------------------------------------------- */ 821 822 static int __init acpi_bus_init_irq(void) 823 { 824 acpi_status status; 825 char *message = NULL; 826 827 828 /* 829 * Let the system know what interrupt model we are using by 830 * evaluating the \_PIC object, if exists. 831 */ 832 833 switch (acpi_irq_model) { 834 case ACPI_IRQ_MODEL_PIC: 835 message = "PIC"; 836 break; 837 case ACPI_IRQ_MODEL_IOAPIC: 838 message = "IOAPIC"; 839 break; 840 case ACPI_IRQ_MODEL_IOSAPIC: 841 message = "IOSAPIC"; 842 break; 843 case ACPI_IRQ_MODEL_GIC: 844 message = "GIC"; 845 break; 846 case ACPI_IRQ_MODEL_PLATFORM: 847 message = "platform specific model"; 848 break; 849 default: 850 printk(KERN_WARNING PREFIX "Unknown interrupt routing model\n"); 851 return -ENODEV; 852 } 853 854 printk(KERN_INFO PREFIX "Using %s for interrupt routing\n", message); 855 856 status = acpi_execute_simple_method(NULL, "\\_PIC", acpi_irq_model); 857 if (ACPI_FAILURE(status) && (status != AE_NOT_FOUND)) { 858 ACPI_EXCEPTION((AE_INFO, status, "Evaluating _PIC")); 859 return -ENODEV; 860 } 861 862 return 0; 863 } 864 865 /** 866 * acpi_early_init - Initialize ACPICA and populate the ACPI namespace. 867 * 868 * The ACPI tables are accessible after this, but the handling of events has not 869 * been initialized and the global lock is not available yet, so AML should not 870 * be executed at this point. 871 * 872 * Doing this before switching the EFI runtime services to virtual mode allows 873 * the EfiBootServices memory to be freed slightly earlier on boot. 874 */ 875 void __init acpi_early_init(void) 876 { 877 acpi_status status; 878 879 if (acpi_disabled) 880 return; 881 882 printk(KERN_INFO PREFIX "Core revision %08x\n", ACPI_CA_VERSION); 883 884 /* It's safe to verify table checksums during late stage */ 885 acpi_gbl_verify_table_checksum = TRUE; 886 887 /* enable workarounds, unless strict ACPI spec. compliance */ 888 if (!acpi_strict) 889 acpi_gbl_enable_interpreter_slack = TRUE; 890 891 acpi_gbl_permanent_mmap = 1; 892 893 /* 894 * If the machine falls into the DMI check table, 895 * DSDT will be copied to memory 896 */ 897 dmi_check_system(dsdt_dmi_table); 898 899 status = acpi_reallocate_root_table(); 900 if (ACPI_FAILURE(status)) { 901 printk(KERN_ERR PREFIX 902 "Unable to reallocate ACPI tables\n"); 903 goto error0; 904 } 905 906 status = acpi_initialize_subsystem(); 907 if (ACPI_FAILURE(status)) { 908 printk(KERN_ERR PREFIX 909 "Unable to initialize the ACPI Interpreter\n"); 910 goto error0; 911 } 912 913 status = acpi_load_tables(); 914 if (ACPI_FAILURE(status)) { 915 printk(KERN_ERR PREFIX 916 "Unable to load the System Description Tables\n"); 917 goto error0; 918 } 919 920 #ifdef CONFIG_X86 921 if (!acpi_ioapic) { 922 /* compatible (0) means level (3) */ 923 if (!(acpi_sci_flags & ACPI_MADT_TRIGGER_MASK)) { 924 acpi_sci_flags &= ~ACPI_MADT_TRIGGER_MASK; 925 acpi_sci_flags |= ACPI_MADT_TRIGGER_LEVEL; 926 } 927 /* Set PIC-mode SCI trigger type */ 928 acpi_pic_sci_set_trigger(acpi_gbl_FADT.sci_interrupt, 929 (acpi_sci_flags & ACPI_MADT_TRIGGER_MASK) >> 2); 930 } else { 931 /* 932 * now that acpi_gbl_FADT is initialized, 933 * update it with result from INT_SRC_OVR parsing 934 */ 935 acpi_gbl_FADT.sci_interrupt = acpi_sci_override_gsi; 936 } 937 #endif 938 return; 939 940 error0: 941 disable_acpi(); 942 } 943 944 /** 945 * acpi_subsystem_init - Finalize the early initialization of ACPI. 946 * 947 * Switch over the platform to the ACPI mode (if possible), initialize the 948 * handling of ACPI events, install the interrupt and global lock handlers. 949 * 950 * Doing this too early is generally unsafe, but at the same time it needs to be 951 * done before all things that really depend on ACPI. The right spot appears to 952 * be before finalizing the EFI initialization. 953 */ 954 void __init acpi_subsystem_init(void) 955 { 956 acpi_status status; 957 958 if (acpi_disabled) 959 return; 960 961 status = acpi_enable_subsystem(~ACPI_NO_ACPI_ENABLE); 962 if (ACPI_FAILURE(status)) { 963 printk(KERN_ERR PREFIX "Unable to enable ACPI\n"); 964 disable_acpi(); 965 } else { 966 /* 967 * If the system is using ACPI then we can be reasonably 968 * confident that any regulators are managed by the firmware 969 * so tell the regulator core it has everything it needs to 970 * know. 971 */ 972 regulator_has_full_constraints(); 973 } 974 } 975 976 static int __init acpi_bus_init(void) 977 { 978 int result; 979 acpi_status status; 980 981 acpi_os_initialize1(); 982 983 status = acpi_enable_subsystem(ACPI_NO_ACPI_ENABLE); 984 if (ACPI_FAILURE(status)) { 985 printk(KERN_ERR PREFIX 986 "Unable to start the ACPI Interpreter\n"); 987 goto error1; 988 } 989 990 /* 991 * ACPI 2.0 requires the EC driver to be loaded and work before 992 * the EC device is found in the namespace (i.e. before acpi_initialize_objects() 993 * is called). 994 * 995 * This is accomplished by looking for the ECDT table, and getting 996 * the EC parameters out of that. 997 */ 998 status = acpi_ec_ecdt_probe(); 999 /* Ignore result. Not having an ECDT is not fatal. */ 1000 1001 status = acpi_initialize_objects(ACPI_FULL_INITIALIZATION); 1002 if (ACPI_FAILURE(status)) { 1003 printk(KERN_ERR PREFIX "Unable to initialize ACPI objects\n"); 1004 goto error1; 1005 } 1006 1007 /* 1008 * _OSC method may exist in module level code, 1009 * so it must be run after ACPI_FULL_INITIALIZATION 1010 */ 1011 acpi_bus_osc_support(); 1012 1013 /* 1014 * _PDC control method may load dynamic SSDT tables, 1015 * and we need to install the table handler before that. 1016 */ 1017 acpi_sysfs_init(); 1018 1019 acpi_early_processor_set_pdc(); 1020 1021 /* 1022 * Maybe EC region is required at bus_scan/acpi_get_devices. So it 1023 * is necessary to enable it as early as possible. 1024 */ 1025 acpi_boot_ec_enable(); 1026 1027 printk(KERN_INFO PREFIX "Interpreter enabled\n"); 1028 1029 /* Initialize sleep structures */ 1030 acpi_sleep_init(); 1031 1032 /* 1033 * Get the system interrupt model and evaluate \_PIC. 1034 */ 1035 result = acpi_bus_init_irq(); 1036 if (result) 1037 goto error1; 1038 1039 /* 1040 * Register the for all standard device notifications. 1041 */ 1042 status = 1043 acpi_install_notify_handler(ACPI_ROOT_OBJECT, ACPI_SYSTEM_NOTIFY, 1044 &acpi_bus_notify, NULL); 1045 if (ACPI_FAILURE(status)) { 1046 printk(KERN_ERR PREFIX 1047 "Unable to register for device notifications\n"); 1048 goto error1; 1049 } 1050 1051 /* 1052 * Create the top ACPI proc directory 1053 */ 1054 acpi_root_dir = proc_mkdir(ACPI_BUS_FILE_ROOT, NULL); 1055 1056 result = bus_register(&acpi_bus_type); 1057 if (!result) 1058 return 0; 1059 1060 /* Mimic structured exception handling */ 1061 error1: 1062 acpi_terminate(); 1063 return -ENODEV; 1064 } 1065 1066 struct kobject *acpi_kobj; 1067 EXPORT_SYMBOL_GPL(acpi_kobj); 1068 1069 static int __init acpi_init(void) 1070 { 1071 int result; 1072 1073 if (acpi_disabled) { 1074 printk(KERN_INFO PREFIX "Interpreter disabled.\n"); 1075 return -ENODEV; 1076 } 1077 1078 acpi_kobj = kobject_create_and_add("acpi", firmware_kobj); 1079 if (!acpi_kobj) { 1080 printk(KERN_WARNING "%s: kset create error\n", __func__); 1081 acpi_kobj = NULL; 1082 } 1083 1084 init_acpi_device_notify(); 1085 result = acpi_bus_init(); 1086 if (result) { 1087 disable_acpi(); 1088 return result; 1089 } 1090 1091 pci_mmcfg_late_init(); 1092 acpi_scan_init(); 1093 acpi_ec_init(); 1094 acpi_debugfs_init(); 1095 acpi_sleep_proc_init(); 1096 acpi_wakeup_device_init(); 1097 return 0; 1098 } 1099 1100 subsys_initcall(acpi_init); 1101