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1// SPDX-License-Identifier: GPL-2.0-or-later
2/*
3 * acpi_bus.c - ACPI Bus Driver ($Revision: 80 $)
4 *
5 * Copyright (C) 2001, 2002 Paul Diefenbaugh <paul.s.diefenbaugh@intel.com>
6 */
7
8#include <linux/module.h>
9#include <linux/init.h>
10#include <linux/ioport.h>
11#include <linux/kernel.h>
12#include <linux/list.h>
13#include <linux/sched.h>
14#include <linux/pm.h>
15#include <linux/device.h>
16#include <linux/proc_fs.h>
17#include <linux/acpi.h>
18#include <linux/slab.h>
19#include <linux/regulator/machine.h>
20#include <linux/workqueue.h>
21#include <linux/reboot.h>
22#include <linux/delay.h>
23#ifdef CONFIG_X86
24#include <asm/mpspec.h>
25#include <linux/dmi.h>
26#endif
27#include <linux/acpi_iort.h>
28#include <linux/pci.h>
29#include <acpi/apei.h>
30#include <linux/suspend.h>
31
32#include "internal.h"
33
34#define _COMPONENT ACPI_BUS_COMPONENT
35ACPI_MODULE_NAME("bus");
36
37struct acpi_device *acpi_root;
38struct proc_dir_entry *acpi_root_dir;
39EXPORT_SYMBOL(acpi_root_dir);
40
41#ifdef CONFIG_X86
42#ifdef CONFIG_ACPI_CUSTOM_DSDT
43static inline int set_copy_dsdt(const struct dmi_system_id *id)
44{
45 return 0;
46}
47#else
48static int set_copy_dsdt(const struct dmi_system_id *id)
49{
50 printk(KERN_NOTICE "%s detected - "
51 "force copy of DSDT to local memory\n", id->ident);
52 acpi_gbl_copy_dsdt_locally = 1;
53 return 0;
54}
55#endif
56
57static const struct dmi_system_id dsdt_dmi_table[] __initconst = {
58 /*
59 * Invoke DSDT corruption work-around on all Toshiba Satellite.
60 * https://bugzilla.kernel.org/show_bug.cgi?id=14679
61 */
62 {
63 .callback = set_copy_dsdt,
64 .ident = "TOSHIBA Satellite",
65 .matches = {
66 DMI_MATCH(DMI_SYS_VENDOR, "TOSHIBA"),
67 DMI_MATCH(DMI_PRODUCT_NAME, "Satellite"),
68 },
69 },
70 {}
71};
72#endif
73
74/* --------------------------------------------------------------------------
75 Device Management
76 -------------------------------------------------------------------------- */
77
78acpi_status acpi_bus_get_status_handle(acpi_handle handle,
79 unsigned long long *sta)
80{
81 acpi_status status;
82
83 status = acpi_evaluate_integer(handle, "_STA", NULL, sta);
84 if (ACPI_SUCCESS(status))
85 return AE_OK;
86
87 if (status == AE_NOT_FOUND) {
88 *sta = ACPI_STA_DEVICE_PRESENT | ACPI_STA_DEVICE_ENABLED |
89 ACPI_STA_DEVICE_UI | ACPI_STA_DEVICE_FUNCTIONING;
90 return AE_OK;
91 }
92 return status;
93}
94EXPORT_SYMBOL_GPL(acpi_bus_get_status_handle);
95
96int acpi_bus_get_status(struct acpi_device *device)
97{
98 acpi_status status;
99 unsigned long long sta;
100
101 if (acpi_device_always_present(device)) {
102 acpi_set_device_status(device, ACPI_STA_DEFAULT);
103 return 0;
104 }
105
106 /* Battery devices must have their deps met before calling _STA */
107 if (acpi_device_is_battery(device) && device->dep_unmet) {
108 acpi_set_device_status(device, 0);
109 return 0;
110 }
111
112 status = acpi_bus_get_status_handle(device->handle, &sta);
113 if (ACPI_FAILURE(status))
114 return -ENODEV;
115
116 acpi_set_device_status(device, sta);
117
118 if (device->status.functional && !device->status.present) {
119 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Device [%s] status [%08x]: "
120 "functional but not present;\n",
121 device->pnp.bus_id, (u32)sta));
122 }
123
124 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Device [%s] status [%08x]\n",
125 device->pnp.bus_id, (u32)sta));
126 return 0;
127}
128EXPORT_SYMBOL(acpi_bus_get_status);
129
130void acpi_bus_private_data_handler(acpi_handle handle,
131 void *context)
132{
133 return;
134}
135EXPORT_SYMBOL(acpi_bus_private_data_handler);
136
137int acpi_bus_attach_private_data(acpi_handle handle, void *data)
138{
139 acpi_status status;
140
141 status = acpi_attach_data(handle,
142 acpi_bus_private_data_handler, data);
143 if (ACPI_FAILURE(status)) {
144 acpi_handle_debug(handle, "Error attaching device data\n");
145 return -ENODEV;
146 }
147
148 return 0;
149}
150EXPORT_SYMBOL_GPL(acpi_bus_attach_private_data);
151
152int acpi_bus_get_private_data(acpi_handle handle, void **data)
153{
154 acpi_status status;
155
156 if (!data)
157 return -EINVAL;
158
159 status = acpi_get_data(handle, acpi_bus_private_data_handler, data);
160 if (ACPI_FAILURE(status)) {
161 acpi_handle_debug(handle, "No context for object\n");
162 return -ENODEV;
163 }
164
165 return 0;
166}
167EXPORT_SYMBOL_GPL(acpi_bus_get_private_data);
168
169void acpi_bus_detach_private_data(acpi_handle handle)
170{
171 acpi_detach_data(handle, acpi_bus_private_data_handler);
172}
173EXPORT_SYMBOL_GPL(acpi_bus_detach_private_data);
174
175static void acpi_print_osc_error(acpi_handle handle,
176 struct acpi_osc_context *context, char *error)
177{
178 int i;
179
180 acpi_handle_debug(handle, "(%s): %s\n", context->uuid_str, error);
181
182 pr_debug("_OSC request data:");
183 for (i = 0; i < context->cap.length; i += sizeof(u32))
184 pr_debug(" %x", *((u32 *)(context->cap.pointer + i)));
185
186 pr_debug("\n");
187}
188
189acpi_status acpi_run_osc(acpi_handle handle, struct acpi_osc_context *context)
190{
191 acpi_status status;
192 struct acpi_object_list input;
193 union acpi_object in_params[4];
194 union acpi_object *out_obj;
195 guid_t guid;
196 u32 errors;
197 struct acpi_buffer output = {ACPI_ALLOCATE_BUFFER, NULL};
198
199 if (!context)
200 return AE_ERROR;
201 if (guid_parse(context->uuid_str, &guid))
202 return AE_ERROR;
203 context->ret.length = ACPI_ALLOCATE_BUFFER;
204 context->ret.pointer = NULL;
205
206 /* Setting up input parameters */
207 input.count = 4;
208 input.pointer = in_params;
209 in_params[0].type = ACPI_TYPE_BUFFER;
210 in_params[0].buffer.length = 16;
211 in_params[0].buffer.pointer = (u8 *)&guid;
212 in_params[1].type = ACPI_TYPE_INTEGER;
213 in_params[1].integer.value = context->rev;
214 in_params[2].type = ACPI_TYPE_INTEGER;
215 in_params[2].integer.value = context->cap.length/sizeof(u32);
216 in_params[3].type = ACPI_TYPE_BUFFER;
217 in_params[3].buffer.length = context->cap.length;
218 in_params[3].buffer.pointer = context->cap.pointer;
219
220 status = acpi_evaluate_object(handle, "_OSC", &input, &output);
221 if (ACPI_FAILURE(status))
222 return status;
223
224 if (!output.length)
225 return AE_NULL_OBJECT;
226
227 out_obj = output.pointer;
228 if (out_obj->type != ACPI_TYPE_BUFFER
229 || out_obj->buffer.length != context->cap.length) {
230 acpi_print_osc_error(handle, context,
231 "_OSC evaluation returned wrong type");
232 status = AE_TYPE;
233 goto out_kfree;
234 }
235 /* Need to ignore the bit0 in result code */
236 errors = *((u32 *)out_obj->buffer.pointer) & ~(1 << 0);
237 if (errors) {
238 if (errors & OSC_REQUEST_ERROR)
239 acpi_print_osc_error(handle, context,
240 "_OSC request failed");
241 if (errors & OSC_INVALID_UUID_ERROR)
242 acpi_print_osc_error(handle, context,
243 "_OSC invalid UUID");
244 if (errors & OSC_INVALID_REVISION_ERROR)
245 acpi_print_osc_error(handle, context,
246 "_OSC invalid revision");
247 if (errors & OSC_CAPABILITIES_MASK_ERROR) {
248 if (((u32 *)context->cap.pointer)[OSC_QUERY_DWORD]
249 & OSC_QUERY_ENABLE)
250 goto out_success;
251 status = AE_SUPPORT;
252 goto out_kfree;
253 }
254 status = AE_ERROR;
255 goto out_kfree;
256 }
257out_success:
258 context->ret.length = out_obj->buffer.length;
259 context->ret.pointer = kmemdup(out_obj->buffer.pointer,
260 context->ret.length, GFP_KERNEL);
261 if (!context->ret.pointer) {
262 status = AE_NO_MEMORY;
263 goto out_kfree;
264 }
265 status = AE_OK;
266
267out_kfree:
268 kfree(output.pointer);
269 if (status != AE_OK)
270 context->ret.pointer = NULL;
271 return status;
272}
273EXPORT_SYMBOL(acpi_run_osc);
274
275bool osc_sb_apei_support_acked;
276
277/*
278 * ACPI 6.0 Section 8.4.4.2 Idle State Coordination
279 * OSPM supports platform coordinated low power idle(LPI) states
280 */
281bool osc_pc_lpi_support_confirmed;
282EXPORT_SYMBOL_GPL(osc_pc_lpi_support_confirmed);
283
284static u8 sb_uuid_str[] = "0811B06E-4A27-44F9-8D60-3CBBC22E7B48";
285static void acpi_bus_osc_support(void)
286{
287 u32 capbuf[2];
288 struct acpi_osc_context context = {
289 .uuid_str = sb_uuid_str,
290 .rev = 1,
291 .cap.length = 8,
292 .cap.pointer = capbuf,
293 };
294 acpi_handle handle;
295
296 capbuf[OSC_QUERY_DWORD] = OSC_QUERY_ENABLE;
297 capbuf[OSC_SUPPORT_DWORD] = OSC_SB_PR3_SUPPORT; /* _PR3 is in use */
298 if (IS_ENABLED(CONFIG_ACPI_PROCESSOR_AGGREGATOR))
299 capbuf[OSC_SUPPORT_DWORD] |= OSC_SB_PAD_SUPPORT;
300 if (IS_ENABLED(CONFIG_ACPI_PROCESSOR))
301 capbuf[OSC_SUPPORT_DWORD] |= OSC_SB_PPC_OST_SUPPORT;
302
303 capbuf[OSC_SUPPORT_DWORD] |= OSC_SB_HOTPLUG_OST_SUPPORT;
304 capbuf[OSC_SUPPORT_DWORD] |= OSC_SB_PCLPI_SUPPORT;
305
306#ifdef CONFIG_X86
307 if (boot_cpu_has(X86_FEATURE_HWP)) {
308 capbuf[OSC_SUPPORT_DWORD] |= OSC_SB_CPC_SUPPORT;
309 capbuf[OSC_SUPPORT_DWORD] |= OSC_SB_CPCV2_SUPPORT;
310 }
311#endif
312
313 if (IS_ENABLED(CONFIG_SCHED_MC_PRIO))
314 capbuf[OSC_SUPPORT_DWORD] |= OSC_SB_CPC_DIVERSE_HIGH_SUPPORT;
315
316 if (!ghes_disable)
317 capbuf[OSC_SUPPORT_DWORD] |= OSC_SB_APEI_SUPPORT;
318 if (ACPI_FAILURE(acpi_get_handle(NULL, "\\_SB", &handle)))
319 return;
320 if (ACPI_SUCCESS(acpi_run_osc(handle, &context))) {
321 u32 *capbuf_ret = context.ret.pointer;
322 if (context.ret.length > OSC_SUPPORT_DWORD) {
323 osc_sb_apei_support_acked =
324 capbuf_ret[OSC_SUPPORT_DWORD] & OSC_SB_APEI_SUPPORT;
325 osc_pc_lpi_support_confirmed =
326 capbuf_ret[OSC_SUPPORT_DWORD] & OSC_SB_PCLPI_SUPPORT;
327 }
328 kfree(context.ret.pointer);
329 }
330 /* do we need to check other returned cap? Sounds no */
331}
332
333/* --------------------------------------------------------------------------
334 Notification Handling
335 -------------------------------------------------------------------------- */
336
337/**
338 * acpi_bus_notify
339 * ---------------
340 * Callback for all 'system-level' device notifications (values 0x00-0x7F).
341 */
342static void acpi_bus_notify(acpi_handle handle, u32 type, void *data)
343{
344 struct acpi_device *adev;
345 struct acpi_driver *driver;
346 u32 ost_code = ACPI_OST_SC_NON_SPECIFIC_FAILURE;
347 bool hotplug_event = false;
348
349 switch (type) {
350 case ACPI_NOTIFY_BUS_CHECK:
351 acpi_handle_debug(handle, "ACPI_NOTIFY_BUS_CHECK event\n");
352 hotplug_event = true;
353 break;
354
355 case ACPI_NOTIFY_DEVICE_CHECK:
356 acpi_handle_debug(handle, "ACPI_NOTIFY_DEVICE_CHECK event\n");
357 hotplug_event = true;
358 break;
359
360 case ACPI_NOTIFY_DEVICE_WAKE:
361 acpi_handle_debug(handle, "ACPI_NOTIFY_DEVICE_WAKE event\n");
362 break;
363
364 case ACPI_NOTIFY_EJECT_REQUEST:
365 acpi_handle_debug(handle, "ACPI_NOTIFY_EJECT_REQUEST event\n");
366 hotplug_event = true;
367 break;
368
369 case ACPI_NOTIFY_DEVICE_CHECK_LIGHT:
370 acpi_handle_debug(handle, "ACPI_NOTIFY_DEVICE_CHECK_LIGHT event\n");
371 /* TBD: Exactly what does 'light' mean? */
372 break;
373
374 case ACPI_NOTIFY_FREQUENCY_MISMATCH:
375 acpi_handle_err(handle, "Device cannot be configured due "
376 "to a frequency mismatch\n");
377 break;
378
379 case ACPI_NOTIFY_BUS_MODE_MISMATCH:
380 acpi_handle_err(handle, "Device cannot be configured due "
381 "to a bus mode mismatch\n");
382 break;
383
384 case ACPI_NOTIFY_POWER_FAULT:
385 acpi_handle_err(handle, "Device has suffered a power fault\n");
386 break;
387
388 default:
389 acpi_handle_debug(handle, "Unknown event type 0x%x\n", type);
390 break;
391 }
392
393 adev = acpi_bus_get_acpi_device(handle);
394 if (!adev)
395 goto err;
396
397 driver = adev->driver;
398 if (driver && driver->ops.notify &&
399 (driver->flags & ACPI_DRIVER_ALL_NOTIFY_EVENTS))
400 driver->ops.notify(adev, type);
401
402 if (!hotplug_event) {
403 acpi_bus_put_acpi_device(adev);
404 return;
405 }
406
407 if (ACPI_SUCCESS(acpi_hotplug_schedule(adev, type)))
408 return;
409
410 acpi_bus_put_acpi_device(adev);
411
412 err:
413 acpi_evaluate_ost(handle, type, ost_code, NULL);
414}
415
416static void acpi_device_notify(acpi_handle handle, u32 event, void *data)
417{
418 struct acpi_device *device = data;
419
420 device->driver->ops.notify(device, event);
421}
422
423static void acpi_device_notify_fixed(void *data)
424{
425 struct acpi_device *device = data;
426
427 /* Fixed hardware devices have no handles */
428 acpi_device_notify(NULL, ACPI_FIXED_HARDWARE_EVENT, device);
429}
430
431static u32 acpi_device_fixed_event(void *data)
432{
433 acpi_os_execute(OSL_NOTIFY_HANDLER, acpi_device_notify_fixed, data);
434 return ACPI_INTERRUPT_HANDLED;
435}
436
437static int acpi_device_install_notify_handler(struct acpi_device *device)
438{
439 acpi_status status;
440
441 if (device->device_type == ACPI_BUS_TYPE_POWER_BUTTON)
442 status =
443 acpi_install_fixed_event_handler(ACPI_EVENT_POWER_BUTTON,
444 acpi_device_fixed_event,
445 device);
446 else if (device->device_type == ACPI_BUS_TYPE_SLEEP_BUTTON)
447 status =
448 acpi_install_fixed_event_handler(ACPI_EVENT_SLEEP_BUTTON,
449 acpi_device_fixed_event,
450 device);
451 else
452 status = acpi_install_notify_handler(device->handle,
453 ACPI_DEVICE_NOTIFY,
454 acpi_device_notify,
455 device);
456
457 if (ACPI_FAILURE(status))
458 return -EINVAL;
459 return 0;
460}
461
462static void acpi_device_remove_notify_handler(struct acpi_device *device)
463{
464 if (device->device_type == ACPI_BUS_TYPE_POWER_BUTTON)
465 acpi_remove_fixed_event_handler(ACPI_EVENT_POWER_BUTTON,
466 acpi_device_fixed_event);
467 else if (device->device_type == ACPI_BUS_TYPE_SLEEP_BUTTON)
468 acpi_remove_fixed_event_handler(ACPI_EVENT_SLEEP_BUTTON,
469 acpi_device_fixed_event);
470 else
471 acpi_remove_notify_handler(device->handle, ACPI_DEVICE_NOTIFY,
472 acpi_device_notify);
473}
474
475/* Handle events targeting \_SB device (at present only graceful shutdown) */
476
477#define ACPI_SB_NOTIFY_SHUTDOWN_REQUEST 0x81
478#define ACPI_SB_INDICATE_INTERVAL 10000
479
480static void sb_notify_work(struct work_struct *dummy)
481{
482 acpi_handle sb_handle;
483
484 orderly_poweroff(true);
485
486 /*
487 * After initiating graceful shutdown, the ACPI spec requires OSPM
488 * to evaluate _OST method once every 10seconds to indicate that
489 * the shutdown is in progress
490 */
491 acpi_get_handle(NULL, "\\_SB", &sb_handle);
492 while (1) {
493 pr_info("Graceful shutdown in progress.\n");
494 acpi_evaluate_ost(sb_handle, ACPI_OST_EC_OSPM_SHUTDOWN,
495 ACPI_OST_SC_OS_SHUTDOWN_IN_PROGRESS, NULL);
496 msleep(ACPI_SB_INDICATE_INTERVAL);
497 }
498}
499
500static void acpi_sb_notify(acpi_handle handle, u32 event, void *data)
501{
502 static DECLARE_WORK(acpi_sb_work, sb_notify_work);
503
504 if (event == ACPI_SB_NOTIFY_SHUTDOWN_REQUEST) {
505 if (!work_busy(&acpi_sb_work))
506 schedule_work(&acpi_sb_work);
507 } else
508 pr_warn("event %x is not supported by \\_SB device\n", event);
509}
510
511static int __init acpi_setup_sb_notify_handler(void)
512{
513 acpi_handle sb_handle;
514
515 if (ACPI_FAILURE(acpi_get_handle(NULL, "\\_SB", &sb_handle)))
516 return -ENXIO;
517
518 if (ACPI_FAILURE(acpi_install_notify_handler(sb_handle, ACPI_DEVICE_NOTIFY,
519 acpi_sb_notify, NULL)))
520 return -EINVAL;
521
522 return 0;
523}
524
525/* --------------------------------------------------------------------------
526 Device Matching
527 -------------------------------------------------------------------------- */
528
529/**
530 * acpi_get_first_physical_node - Get first physical node of an ACPI device
531 * @adev: ACPI device in question
532 *
533 * Return: First physical node of ACPI device @adev
534 */
535struct device *acpi_get_first_physical_node(struct acpi_device *adev)
536{
537 struct mutex *physical_node_lock = &adev->physical_node_lock;
538 struct device *phys_dev;
539
540 mutex_lock(physical_node_lock);
541 if (list_empty(&adev->physical_node_list)) {
542 phys_dev = NULL;
543 } else {
544 const struct acpi_device_physical_node *node;
545
546 node = list_first_entry(&adev->physical_node_list,
547 struct acpi_device_physical_node, node);
548
549 phys_dev = node->dev;
550 }
551 mutex_unlock(physical_node_lock);
552 return phys_dev;
553}
554
555static struct acpi_device *acpi_primary_dev_companion(struct acpi_device *adev,
556 const struct device *dev)
557{
558 const struct device *phys_dev = acpi_get_first_physical_node(adev);
559
560 return phys_dev && phys_dev == dev ? adev : NULL;
561}
562
563/**
564 * acpi_device_is_first_physical_node - Is given dev first physical node
565 * @adev: ACPI companion device
566 * @dev: Physical device to check
567 *
568 * Function checks if given @dev is the first physical devices attached to
569 * the ACPI companion device. This distinction is needed in some cases
570 * where the same companion device is shared between many physical devices.
571 *
572 * Note that the caller have to provide valid @adev pointer.
573 */
574bool acpi_device_is_first_physical_node(struct acpi_device *adev,
575 const struct device *dev)
576{
577 return !!acpi_primary_dev_companion(adev, dev);
578}
579
580/*
581 * acpi_companion_match() - Can we match via ACPI companion device
582 * @dev: Device in question
583 *
584 * Check if the given device has an ACPI companion and if that companion has
585 * a valid list of PNP IDs, and if the device is the first (primary) physical
586 * device associated with it. Return the companion pointer if that's the case
587 * or NULL otherwise.
588 *
589 * If multiple physical devices are attached to a single ACPI companion, we need
590 * to be careful. The usage scenario for this kind of relationship is that all
591 * of the physical devices in question use resources provided by the ACPI
592 * companion. A typical case is an MFD device where all the sub-devices share
593 * the parent's ACPI companion. In such cases we can only allow the primary
594 * (first) physical device to be matched with the help of the companion's PNP
595 * IDs.
596 *
597 * Additional physical devices sharing the ACPI companion can still use
598 * resources available from it but they will be matched normally using functions
599 * provided by their bus types (and analogously for their modalias).
600 */
601struct acpi_device *acpi_companion_match(const struct device *dev)
602{
603 struct acpi_device *adev;
604
605 adev = ACPI_COMPANION(dev);
606 if (!adev)
607 return NULL;
608
609 if (list_empty(&adev->pnp.ids))
610 return NULL;
611
612 return acpi_primary_dev_companion(adev, dev);
613}
614
615/**
616 * acpi_of_match_device - Match device object using the "compatible" property.
617 * @adev: ACPI device object to match.
618 * @of_match_table: List of device IDs to match against.
619 * @of_id: OF ID if matched
620 *
621 * If @dev has an ACPI companion which has ACPI_DT_NAMESPACE_HID in its list of
622 * identifiers and a _DSD object with the "compatible" property, use that
623 * property to match against the given list of identifiers.
624 */
625static bool acpi_of_match_device(struct acpi_device *adev,
626 const struct of_device_id *of_match_table,
627 const struct of_device_id **of_id)
628{
629 const union acpi_object *of_compatible, *obj;
630 int i, nval;
631
632 if (!adev)
633 return false;
634
635 of_compatible = adev->data.of_compatible;
636 if (!of_match_table || !of_compatible)
637 return false;
638
639 if (of_compatible->type == ACPI_TYPE_PACKAGE) {
640 nval = of_compatible->package.count;
641 obj = of_compatible->package.elements;
642 } else { /* Must be ACPI_TYPE_STRING. */
643 nval = 1;
644 obj = of_compatible;
645 }
646 /* Now we can look for the driver DT compatible strings */
647 for (i = 0; i < nval; i++, obj++) {
648 const struct of_device_id *id;
649
650 for (id = of_match_table; id->compatible[0]; id++)
651 if (!strcasecmp(obj->string.pointer, id->compatible)) {
652 if (of_id)
653 *of_id = id;
654 return true;
655 }
656 }
657
658 return false;
659}
660
661static bool acpi_of_modalias(struct acpi_device *adev,
662 char *modalias, size_t len)
663{
664 const union acpi_object *of_compatible;
665 const union acpi_object *obj;
666 const char *str, *chr;
667
668 of_compatible = adev->data.of_compatible;
669 if (!of_compatible)
670 return false;
671
672 if (of_compatible->type == ACPI_TYPE_PACKAGE)
673 obj = of_compatible->package.elements;
674 else /* Must be ACPI_TYPE_STRING. */
675 obj = of_compatible;
676
677 str = obj->string.pointer;
678 chr = strchr(str, ',');
679 strlcpy(modalias, chr ? chr + 1 : str, len);
680
681 return true;
682}
683
684/**
685 * acpi_set_modalias - Set modalias using "compatible" property or supplied ID
686 * @adev: ACPI device object to match
687 * @default_id: ID string to use as default if no compatible string found
688 * @modalias: Pointer to buffer that modalias value will be copied into
689 * @len: Length of modalias buffer
690 *
691 * This is a counterpart of of_modalias_node() for struct acpi_device objects.
692 * If there is a compatible string for @adev, it will be copied to @modalias
693 * with the vendor prefix stripped; otherwise, @default_id will be used.
694 */
695void acpi_set_modalias(struct acpi_device *adev, const char *default_id,
696 char *modalias, size_t len)
697{
698 if (!acpi_of_modalias(adev, modalias, len))
699 strlcpy(modalias, default_id, len);
700}
701EXPORT_SYMBOL_GPL(acpi_set_modalias);
702
703static bool __acpi_match_device_cls(const struct acpi_device_id *id,
704 struct acpi_hardware_id *hwid)
705{
706 int i, msk, byte_shift;
707 char buf[3];
708
709 if (!id->cls)
710 return false;
711
712 /* Apply class-code bitmask, before checking each class-code byte */
713 for (i = 1; i <= 3; i++) {
714 byte_shift = 8 * (3 - i);
715 msk = (id->cls_msk >> byte_shift) & 0xFF;
716 if (!msk)
717 continue;
718
719 sprintf(buf, "%02x", (id->cls >> byte_shift) & msk);
720 if (strncmp(buf, &hwid->id[(i - 1) * 2], 2))
721 return false;
722 }
723 return true;
724}
725
726static bool __acpi_match_device(struct acpi_device *device,
727 const struct acpi_device_id *acpi_ids,
728 const struct of_device_id *of_ids,
729 const struct acpi_device_id **acpi_id,
730 const struct of_device_id **of_id)
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 false;
741
742 list_for_each_entry(hwid, &device->pnp.ids, list) {
743 /* First, check the ACPI/PNP IDs provided by the caller. */
744 if (acpi_ids) {
745 for (id = acpi_ids; id->id[0] || id->cls; id++) {
746 if (id->id[0] && !strcmp((char *)id->id, hwid->id))
747 goto out_acpi_match;
748 if (id->cls && __acpi_match_device_cls(id, hwid))
749 goto out_acpi_match;
750 }
751 }
752
753 /*
754 * Next, check ACPI_DT_NAMESPACE_HID and try to match the
755 * "compatible" property if found.
756 */
757 if (!strcmp(ACPI_DT_NAMESPACE_HID, hwid->id))
758 return acpi_of_match_device(device, of_ids, of_id);
759 }
760 return false;
761
762out_acpi_match:
763 if (acpi_id)
764 *acpi_id = id;
765 return true;
766}
767
768/**
769 * acpi_match_device - Match a struct device against a given list of ACPI IDs
770 * @ids: Array of struct acpi_device_id object to match against.
771 * @dev: The device structure to match.
772 *
773 * Check if @dev has a valid ACPI handle and if there is a struct acpi_device
774 * object for that handle and use that object to match against a given list of
775 * device IDs.
776 *
777 * Return a pointer to the first matching ID on success or %NULL on failure.
778 */
779const struct acpi_device_id *acpi_match_device(const struct acpi_device_id *ids,
780 const struct device *dev)
781{
782 const struct acpi_device_id *id = NULL;
783
784 __acpi_match_device(acpi_companion_match(dev), ids, NULL, &id, NULL);
785 return id;
786}
787EXPORT_SYMBOL_GPL(acpi_match_device);
788
789static const void *acpi_of_device_get_match_data(const struct device *dev)
790{
791 struct acpi_device *adev = ACPI_COMPANION(dev);
792 const struct of_device_id *match = NULL;
793
794 if (!acpi_of_match_device(adev, dev->driver->of_match_table, &match))
795 return NULL;
796
797 return match->data;
798}
799
800const void *acpi_device_get_match_data(const struct device *dev)
801{
802 const struct acpi_device_id *match;
803
804 if (!dev->driver->acpi_match_table)
805 return acpi_of_device_get_match_data(dev);
806
807 match = acpi_match_device(dev->driver->acpi_match_table, dev);
808 if (!match)
809 return NULL;
810
811 return (const void *)match->driver_data;
812}
813EXPORT_SYMBOL_GPL(acpi_device_get_match_data);
814
815int acpi_match_device_ids(struct acpi_device *device,
816 const struct acpi_device_id *ids)
817{
818 return __acpi_match_device(device, ids, NULL, NULL, NULL) ? 0 : -ENOENT;
819}
820EXPORT_SYMBOL(acpi_match_device_ids);
821
822bool acpi_driver_match_device(struct device *dev,
823 const struct device_driver *drv)
824{
825 if (!drv->acpi_match_table)
826 return acpi_of_match_device(ACPI_COMPANION(dev),
827 drv->of_match_table,
828 NULL);
829
830 return __acpi_match_device(acpi_companion_match(dev),
831 drv->acpi_match_table, drv->of_match_table,
832 NULL, NULL);
833}
834EXPORT_SYMBOL_GPL(acpi_driver_match_device);
835
836/* --------------------------------------------------------------------------
837 ACPI Driver Management
838 -------------------------------------------------------------------------- */
839
840/**
841 * acpi_bus_register_driver - register a driver with the ACPI bus
842 * @driver: driver being registered
843 *
844 * Registers a driver with the ACPI bus. Searches the namespace for all
845 * devices that match the driver's criteria and binds. Returns zero for
846 * success or a negative error status for failure.
847 */
848int acpi_bus_register_driver(struct acpi_driver *driver)
849{
850 int ret;
851
852 if (acpi_disabled)
853 return -ENODEV;
854 driver->drv.name = driver->name;
855 driver->drv.bus = &acpi_bus_type;
856 driver->drv.owner = driver->owner;
857
858 ret = driver_register(&driver->drv);
859 return ret;
860}
861
862EXPORT_SYMBOL(acpi_bus_register_driver);
863
864/**
865 * acpi_bus_unregister_driver - unregisters a driver with the ACPI bus
866 * @driver: driver to unregister
867 *
868 * Unregisters a driver with the ACPI bus. Searches the namespace for all
869 * devices that match the driver's criteria and unbinds.
870 */
871void acpi_bus_unregister_driver(struct acpi_driver *driver)
872{
873 driver_unregister(&driver->drv);
874}
875
876EXPORT_SYMBOL(acpi_bus_unregister_driver);
877
878/* --------------------------------------------------------------------------
879 ACPI Bus operations
880 -------------------------------------------------------------------------- */
881
882static int acpi_bus_match(struct device *dev, struct device_driver *drv)
883{
884 struct acpi_device *acpi_dev = to_acpi_device(dev);
885 struct acpi_driver *acpi_drv = to_acpi_driver(drv);
886
887 return acpi_dev->flags.match_driver
888 && !acpi_match_device_ids(acpi_dev, acpi_drv->ids);
889}
890
891static int acpi_device_uevent(struct device *dev, struct kobj_uevent_env *env)
892{
893 return __acpi_device_uevent_modalias(to_acpi_device(dev), env);
894}
895
896static int acpi_device_probe(struct device *dev)
897{
898 struct acpi_device *acpi_dev = to_acpi_device(dev);
899 struct acpi_driver *acpi_drv = to_acpi_driver(dev->driver);
900 int ret;
901
902 if (acpi_dev->handler && !acpi_is_pnp_device(acpi_dev))
903 return -EINVAL;
904
905 if (!acpi_drv->ops.add)
906 return -ENOSYS;
907
908 ret = acpi_drv->ops.add(acpi_dev);
909 if (ret)
910 return ret;
911
912 acpi_dev->driver = acpi_drv;
913 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
914 "Driver [%s] successfully bound to device [%s]\n",
915 acpi_drv->name, acpi_dev->pnp.bus_id));
916
917 if (acpi_drv->ops.notify) {
918 ret = acpi_device_install_notify_handler(acpi_dev);
919 if (ret) {
920 if (acpi_drv->ops.remove)
921 acpi_drv->ops.remove(acpi_dev);
922
923 acpi_dev->driver = NULL;
924 acpi_dev->driver_data = NULL;
925 return ret;
926 }
927 }
928
929 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found driver [%s] for device [%s]\n",
930 acpi_drv->name, acpi_dev->pnp.bus_id));
931 get_device(dev);
932 return 0;
933}
934
935static int acpi_device_remove(struct device *dev)
936{
937 struct acpi_device *acpi_dev = to_acpi_device(dev);
938 struct acpi_driver *acpi_drv = acpi_dev->driver;
939
940 if (acpi_drv) {
941 if (acpi_drv->ops.notify)
942 acpi_device_remove_notify_handler(acpi_dev);
943 if (acpi_drv->ops.remove)
944 acpi_drv->ops.remove(acpi_dev);
945 }
946 acpi_dev->driver = NULL;
947 acpi_dev->driver_data = NULL;
948
949 put_device(dev);
950 return 0;
951}
952
953struct bus_type acpi_bus_type = {
954 .name = "acpi",
955 .match = acpi_bus_match,
956 .probe = acpi_device_probe,
957 .remove = acpi_device_remove,
958 .uevent = acpi_device_uevent,
959};
960
961/* --------------------------------------------------------------------------
962 Initialization/Cleanup
963 -------------------------------------------------------------------------- */
964
965static int __init acpi_bus_init_irq(void)
966{
967 acpi_status status;
968 char *message = NULL;
969
970
971 /*
972 * Let the system know what interrupt model we are using by
973 * evaluating the \_PIC object, if exists.
974 */
975
976 switch (acpi_irq_model) {
977 case ACPI_IRQ_MODEL_PIC:
978 message = "PIC";
979 break;
980 case ACPI_IRQ_MODEL_IOAPIC:
981 message = "IOAPIC";
982 break;
983 case ACPI_IRQ_MODEL_IOSAPIC:
984 message = "IOSAPIC";
985 break;
986 case ACPI_IRQ_MODEL_GIC:
987 message = "GIC";
988 break;
989 case ACPI_IRQ_MODEL_PLATFORM:
990 message = "platform specific model";
991 break;
992 default:
993 printk(KERN_WARNING PREFIX "Unknown interrupt routing model\n");
994 return -ENODEV;
995 }
996
997 printk(KERN_INFO PREFIX "Using %s for interrupt routing\n", message);
998
999 status = acpi_execute_simple_method(NULL, "\\_PIC", acpi_irq_model);
1000 if (ACPI_FAILURE(status) && (status != AE_NOT_FOUND)) {
1001 ACPI_EXCEPTION((AE_INFO, status, "Evaluating _PIC"));
1002 return -ENODEV;
1003 }
1004
1005 return 0;
1006}
1007
1008/**
1009 * acpi_early_init - Initialize ACPICA and populate the ACPI namespace.
1010 *
1011 * The ACPI tables are accessible after this, but the handling of events has not
1012 * been initialized and the global lock is not available yet, so AML should not
1013 * be executed at this point.
1014 *
1015 * Doing this before switching the EFI runtime services to virtual mode allows
1016 * the EfiBootServices memory to be freed slightly earlier on boot.
1017 */
1018void __init acpi_early_init(void)
1019{
1020 acpi_status status;
1021
1022 if (acpi_disabled)
1023 return;
1024
1025 printk(KERN_INFO PREFIX "Core revision %08x\n", ACPI_CA_VERSION);
1026
1027 /* enable workarounds, unless strict ACPI spec. compliance */
1028 if (!acpi_strict)
1029 acpi_gbl_enable_interpreter_slack = TRUE;
1030
1031 acpi_permanent_mmap = true;
1032
1033#ifdef CONFIG_X86
1034 /*
1035 * If the machine falls into the DMI check table,
1036 * DSDT will be copied to memory.
1037 * Note that calling dmi_check_system() here on other architectures
1038 * would not be OK because only x86 initializes dmi early enough.
1039 * Thankfully only x86 systems need such quirks for now.
1040 */
1041 dmi_check_system(dsdt_dmi_table);
1042#endif
1043
1044 status = acpi_reallocate_root_table();
1045 if (ACPI_FAILURE(status)) {
1046 printk(KERN_ERR PREFIX
1047 "Unable to reallocate ACPI tables\n");
1048 goto error0;
1049 }
1050
1051 status = acpi_initialize_subsystem();
1052 if (ACPI_FAILURE(status)) {
1053 printk(KERN_ERR PREFIX
1054 "Unable to initialize the ACPI Interpreter\n");
1055 goto error0;
1056 }
1057
1058#ifdef CONFIG_X86
1059 if (!acpi_ioapic) {
1060 /* compatible (0) means level (3) */
1061 if (!(acpi_sci_flags & ACPI_MADT_TRIGGER_MASK)) {
1062 acpi_sci_flags &= ~ACPI_MADT_TRIGGER_MASK;
1063 acpi_sci_flags |= ACPI_MADT_TRIGGER_LEVEL;
1064 }
1065 /* Set PIC-mode SCI trigger type */
1066 acpi_pic_sci_set_trigger(acpi_gbl_FADT.sci_interrupt,
1067 (acpi_sci_flags & ACPI_MADT_TRIGGER_MASK) >> 2);
1068 } else {
1069 /*
1070 * now that acpi_gbl_FADT is initialized,
1071 * update it with result from INT_SRC_OVR parsing
1072 */
1073 acpi_gbl_FADT.sci_interrupt = acpi_sci_override_gsi;
1074 }
1075#endif
1076 return;
1077
1078 error0:
1079 disable_acpi();
1080}
1081
1082/**
1083 * acpi_subsystem_init - Finalize the early initialization of ACPI.
1084 *
1085 * Switch over the platform to the ACPI mode (if possible).
1086 *
1087 * Doing this too early is generally unsafe, but at the same time it needs to be
1088 * done before all things that really depend on ACPI. The right spot appears to
1089 * be before finalizing the EFI initialization.
1090 */
1091void __init acpi_subsystem_init(void)
1092{
1093 acpi_status status;
1094
1095 if (acpi_disabled)
1096 return;
1097
1098 status = acpi_enable_subsystem(~ACPI_NO_ACPI_ENABLE);
1099 if (ACPI_FAILURE(status)) {
1100 printk(KERN_ERR PREFIX "Unable to enable ACPI\n");
1101 disable_acpi();
1102 } else {
1103 /*
1104 * If the system is using ACPI then we can be reasonably
1105 * confident that any regulators are managed by the firmware
1106 * so tell the regulator core it has everything it needs to
1107 * know.
1108 */
1109 regulator_has_full_constraints();
1110 }
1111}
1112
1113static acpi_status acpi_bus_table_handler(u32 event, void *table, void *context)
1114{
1115 acpi_scan_table_handler(event, table, context);
1116
1117 return acpi_sysfs_table_handler(event, table, context);
1118}
1119
1120static int __init acpi_bus_init(void)
1121{
1122 int result;
1123 acpi_status status;
1124
1125 acpi_os_initialize1();
1126
1127 status = acpi_load_tables();
1128 if (ACPI_FAILURE(status)) {
1129 printk(KERN_ERR PREFIX
1130 "Unable to load the System Description Tables\n");
1131 goto error1;
1132 }
1133
1134 /*
1135 * ACPI 2.0 requires the EC driver to be loaded and work before the EC
1136 * device is found in the namespace.
1137 *
1138 * This is accomplished by looking for the ECDT table and getting the EC
1139 * parameters out of that.
1140 *
1141 * Do that before calling acpi_initialize_objects() which may trigger EC
1142 * address space accesses.
1143 */
1144 acpi_ec_ecdt_probe();
1145
1146 status = acpi_enable_subsystem(ACPI_NO_ACPI_ENABLE);
1147 if (ACPI_FAILURE(status)) {
1148 printk(KERN_ERR PREFIX
1149 "Unable to start the ACPI Interpreter\n");
1150 goto error1;
1151 }
1152
1153 status = acpi_initialize_objects(ACPI_FULL_INITIALIZATION);
1154 if (ACPI_FAILURE(status)) {
1155 printk(KERN_ERR PREFIX "Unable to initialize ACPI objects\n");
1156 goto error1;
1157 }
1158
1159 /* Set capability bits for _OSC under processor scope */
1160 acpi_early_processor_osc();
1161
1162 /*
1163 * _OSC method may exist in module level code,
1164 * so it must be run after ACPI_FULL_INITIALIZATION
1165 */
1166 acpi_bus_osc_support();
1167
1168 /*
1169 * _PDC control method may load dynamic SSDT tables,
1170 * and we need to install the table handler before that.
1171 */
1172 status = acpi_install_table_handler(acpi_bus_table_handler, NULL);
1173
1174 acpi_sysfs_init();
1175
1176 acpi_early_processor_set_pdc();
1177
1178 /*
1179 * Maybe EC region is required at bus_scan/acpi_get_devices. So it
1180 * is necessary to enable it as early as possible.
1181 */
1182 acpi_ec_dsdt_probe();
1183
1184 printk(KERN_INFO PREFIX "Interpreter enabled\n");
1185
1186 /* Initialize sleep structures */
1187 acpi_sleep_init();
1188
1189 /*
1190 * Get the system interrupt model and evaluate \_PIC.
1191 */
1192 result = acpi_bus_init_irq();
1193 if (result)
1194 goto error1;
1195
1196 /*
1197 * Register the for all standard device notifications.
1198 */
1199 status =
1200 acpi_install_notify_handler(ACPI_ROOT_OBJECT, ACPI_SYSTEM_NOTIFY,
1201 &acpi_bus_notify, NULL);
1202 if (ACPI_FAILURE(status)) {
1203 printk(KERN_ERR PREFIX
1204 "Unable to register for device notifications\n");
1205 goto error1;
1206 }
1207
1208 /*
1209 * Create the top ACPI proc directory
1210 */
1211 acpi_root_dir = proc_mkdir(ACPI_BUS_FILE_ROOT, NULL);
1212
1213 result = bus_register(&acpi_bus_type);
1214 if (!result)
1215 return 0;
1216
1217 /* Mimic structured exception handling */
1218 error1:
1219 acpi_terminate();
1220 return -ENODEV;
1221}
1222
1223struct kobject *acpi_kobj;
1224EXPORT_SYMBOL_GPL(acpi_kobj);
1225
1226static int __init acpi_init(void)
1227{
1228 int result;
1229
1230 if (acpi_disabled) {
1231 printk(KERN_INFO PREFIX "Interpreter disabled.\n");
1232 return -ENODEV;
1233 }
1234
1235 acpi_kobj = kobject_create_and_add("acpi", firmware_kobj);
1236 if (!acpi_kobj) {
1237 printk(KERN_WARNING "%s: kset create error\n", __func__);
1238 acpi_kobj = NULL;
1239 }
1240
1241 result = acpi_bus_init();
1242 if (result) {
1243 disable_acpi();
1244 return result;
1245 }
1246
1247 pci_mmcfg_late_init();
1248 acpi_iort_init();
1249 acpi_scan_init();
1250 acpi_ec_init();
1251 acpi_debugfs_init();
1252 acpi_sleep_proc_init();
1253 acpi_wakeup_device_init();
1254 acpi_debugger_init();
1255 acpi_setup_sb_notify_handler();
1256 return 0;
1257}
1258
1259subsys_initcall(acpi_init);
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
44ACPI_MODULE_NAME("bus");
45
46struct acpi_device *acpi_root;
47struct proc_dir_entry *acpi_root_dir;
48EXPORT_SYMBOL(acpi_root_dir);
49
50#ifdef CONFIG_X86
51#ifdef CONFIG_ACPI_CUSTOM_DSDT
52static inline int set_copy_dsdt(const struct dmi_system_id *id)
53{
54 return 0;
55}
56#else
57static 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
66static 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
82static struct dmi_system_id dsdt_dmi_table[] __initdata = {
83 {}
84};
85#endif
86
87/* --------------------------------------------------------------------------
88 Device Management
89 -------------------------------------------------------------------------- */
90
91acpi_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
108int 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}
129EXPORT_SYMBOL(acpi_bus_get_status);
130
131void acpi_bus_private_data_handler(acpi_handle handle,
132 void *context)
133{
134 return;
135}
136EXPORT_SYMBOL(acpi_bus_private_data_handler);
137
138int 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}
151EXPORT_SYMBOL_GPL(acpi_bus_attach_private_data);
152
153int 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}
168EXPORT_SYMBOL_GPL(acpi_bus_get_private_data);
169
170void acpi_bus_detach_private_data(acpi_handle handle)
171{
172 acpi_detach_data(handle, acpi_bus_private_data_handler);
173}
174EXPORT_SYMBOL_GPL(acpi_bus_detach_private_data);
175
176static 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: %s\n", context->uuid_str, error);
184 else {
185 printk(KERN_DEBUG "%s (%s): %s\n",
186 (char *)buffer.pointer, context->uuid_str, error);
187 kfree(buffer.pointer);
188 }
189 printk(KERN_DEBUG "_OSC request data:");
190 for (i = 0; i < context->cap.length; i += sizeof(u32))
191 printk(" %x", *((u32 *)(context->cap.pointer + i)));
192 printk("\n");
193}
194
195acpi_status acpi_str_to_uuid(char *str, u8 *uuid)
196{
197 int i;
198 static int opc_map_to_uuid[16] = {6, 4, 2, 0, 11, 9, 16, 14, 19, 21,
199 24, 26, 28, 30, 32, 34};
200
201 if (strlen(str) != 36)
202 return AE_BAD_PARAMETER;
203 for (i = 0; i < 36; i++) {
204 if (i == 8 || i == 13 || i == 18 || i == 23) {
205 if (str[i] != '-')
206 return AE_BAD_PARAMETER;
207 } else if (!isxdigit(str[i]))
208 return AE_BAD_PARAMETER;
209 }
210 for (i = 0; i < 16; i++) {
211 uuid[i] = hex_to_bin(str[opc_map_to_uuid[i]]) << 4;
212 uuid[i] |= hex_to_bin(str[opc_map_to_uuid[i] + 1]);
213 }
214 return AE_OK;
215}
216EXPORT_SYMBOL_GPL(acpi_str_to_uuid);
217
218acpi_status acpi_run_osc(acpi_handle handle, struct acpi_osc_context *context)
219{
220 acpi_status status;
221 struct acpi_object_list input;
222 union acpi_object in_params[4];
223 union acpi_object *out_obj;
224 u8 uuid[16];
225 u32 errors;
226 struct acpi_buffer output = {ACPI_ALLOCATE_BUFFER, NULL};
227
228 if (!context)
229 return AE_ERROR;
230 if (ACPI_FAILURE(acpi_str_to_uuid(context->uuid_str, uuid)))
231 return AE_ERROR;
232 context->ret.length = ACPI_ALLOCATE_BUFFER;
233 context->ret.pointer = NULL;
234
235 /* Setting up input parameters */
236 input.count = 4;
237 input.pointer = in_params;
238 in_params[0].type = ACPI_TYPE_BUFFER;
239 in_params[0].buffer.length = 16;
240 in_params[0].buffer.pointer = uuid;
241 in_params[1].type = ACPI_TYPE_INTEGER;
242 in_params[1].integer.value = context->rev;
243 in_params[2].type = ACPI_TYPE_INTEGER;
244 in_params[2].integer.value = context->cap.length/sizeof(u32);
245 in_params[3].type = ACPI_TYPE_BUFFER;
246 in_params[3].buffer.length = context->cap.length;
247 in_params[3].buffer.pointer = context->cap.pointer;
248
249 status = acpi_evaluate_object(handle, "_OSC", &input, &output);
250 if (ACPI_FAILURE(status))
251 return status;
252
253 if (!output.length)
254 return AE_NULL_OBJECT;
255
256 out_obj = output.pointer;
257 if (out_obj->type != ACPI_TYPE_BUFFER
258 || out_obj->buffer.length != context->cap.length) {
259 acpi_print_osc_error(handle, context,
260 "_OSC evaluation returned wrong type");
261 status = AE_TYPE;
262 goto out_kfree;
263 }
264 /* Need to ignore the bit0 in result code */
265 errors = *((u32 *)out_obj->buffer.pointer) & ~(1 << 0);
266 if (errors) {
267 if (errors & OSC_REQUEST_ERROR)
268 acpi_print_osc_error(handle, context,
269 "_OSC request failed");
270 if (errors & OSC_INVALID_UUID_ERROR)
271 acpi_print_osc_error(handle, context,
272 "_OSC invalid UUID");
273 if (errors & OSC_INVALID_REVISION_ERROR)
274 acpi_print_osc_error(handle, context,
275 "_OSC invalid revision");
276 if (errors & OSC_CAPABILITIES_MASK_ERROR) {
277 if (((u32 *)context->cap.pointer)[OSC_QUERY_DWORD]
278 & OSC_QUERY_ENABLE)
279 goto out_success;
280 status = AE_SUPPORT;
281 goto out_kfree;
282 }
283 status = AE_ERROR;
284 goto out_kfree;
285 }
286out_success:
287 context->ret.length = out_obj->buffer.length;
288 context->ret.pointer = kmemdup(out_obj->buffer.pointer,
289 context->ret.length, GFP_KERNEL);
290 if (!context->ret.pointer) {
291 status = AE_NO_MEMORY;
292 goto out_kfree;
293 }
294 status = AE_OK;
295
296out_kfree:
297 kfree(output.pointer);
298 if (status != AE_OK)
299 context->ret.pointer = NULL;
300 return status;
301}
302EXPORT_SYMBOL(acpi_run_osc);
303
304bool osc_sb_apei_support_acked;
305static u8 sb_uuid_str[] = "0811B06E-4A27-44F9-8D60-3CBBC22E7B48";
306static void acpi_bus_osc_support(void)
307{
308 u32 capbuf[2];
309 struct acpi_osc_context context = {
310 .uuid_str = sb_uuid_str,
311 .rev = 1,
312 .cap.length = 8,
313 .cap.pointer = capbuf,
314 };
315 acpi_handle handle;
316
317 capbuf[OSC_QUERY_DWORD] = OSC_QUERY_ENABLE;
318 capbuf[OSC_SUPPORT_DWORD] = OSC_SB_PR3_SUPPORT; /* _PR3 is in use */
319 if (IS_ENABLED(CONFIG_ACPI_PROCESSOR_AGGREGATOR))
320 capbuf[OSC_SUPPORT_DWORD] |= OSC_SB_PAD_SUPPORT;
321 if (IS_ENABLED(CONFIG_ACPI_PROCESSOR))
322 capbuf[OSC_SUPPORT_DWORD] |= OSC_SB_PPC_OST_SUPPORT;
323
324 capbuf[OSC_SUPPORT_DWORD] |= OSC_SB_HOTPLUG_OST_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 kfree(context.ret.pointer);
336 }
337 /* do we need to check other returned cap? Sounds no */
338}
339
340/* --------------------------------------------------------------------------
341 Notification Handling
342 -------------------------------------------------------------------------- */
343
344/**
345 * acpi_bus_notify
346 * ---------------
347 * Callback for all 'system-level' device notifications (values 0x00-0x7F).
348 */
349static void acpi_bus_notify(acpi_handle handle, u32 type, void *data)
350{
351 struct acpi_device *adev;
352 struct acpi_driver *driver;
353 u32 ost_code = ACPI_OST_SC_NON_SPECIFIC_FAILURE;
354 bool hotplug_event = false;
355
356 switch (type) {
357 case ACPI_NOTIFY_BUS_CHECK:
358 acpi_handle_debug(handle, "ACPI_NOTIFY_BUS_CHECK event\n");
359 hotplug_event = true;
360 break;
361
362 case ACPI_NOTIFY_DEVICE_CHECK:
363 acpi_handle_debug(handle, "ACPI_NOTIFY_DEVICE_CHECK event\n");
364 hotplug_event = true;
365 break;
366
367 case ACPI_NOTIFY_DEVICE_WAKE:
368 acpi_handle_debug(handle, "ACPI_NOTIFY_DEVICE_WAKE event\n");
369 break;
370
371 case ACPI_NOTIFY_EJECT_REQUEST:
372 acpi_handle_debug(handle, "ACPI_NOTIFY_EJECT_REQUEST event\n");
373 hotplug_event = true;
374 break;
375
376 case ACPI_NOTIFY_DEVICE_CHECK_LIGHT:
377 acpi_handle_debug(handle, "ACPI_NOTIFY_DEVICE_CHECK_LIGHT event\n");
378 /* TBD: Exactly what does 'light' mean? */
379 break;
380
381 case ACPI_NOTIFY_FREQUENCY_MISMATCH:
382 acpi_handle_err(handle, "Device cannot be configured due "
383 "to a frequency mismatch\n");
384 break;
385
386 case ACPI_NOTIFY_BUS_MODE_MISMATCH:
387 acpi_handle_err(handle, "Device cannot be configured due "
388 "to a bus mode mismatch\n");
389 break;
390
391 case ACPI_NOTIFY_POWER_FAULT:
392 acpi_handle_err(handle, "Device has suffered a power fault\n");
393 break;
394
395 default:
396 acpi_handle_debug(handle, "Unknown event type 0x%x\n", type);
397 break;
398 }
399
400 adev = acpi_bus_get_acpi_device(handle);
401 if (!adev)
402 goto err;
403
404 driver = adev->driver;
405 if (driver && driver->ops.notify &&
406 (driver->flags & ACPI_DRIVER_ALL_NOTIFY_EVENTS))
407 driver->ops.notify(adev, type);
408
409 if (hotplug_event && ACPI_SUCCESS(acpi_hotplug_schedule(adev, type)))
410 return;
411
412 acpi_bus_put_acpi_device(adev);
413 return;
414
415 err:
416 acpi_evaluate_ost(handle, type, ost_code, NULL);
417}
418
419static void acpi_device_notify(acpi_handle handle, u32 event, void *data)
420{
421 struct acpi_device *device = data;
422
423 device->driver->ops.notify(device, event);
424}
425
426static void acpi_device_notify_fixed(void *data)
427{
428 struct acpi_device *device = data;
429
430 /* Fixed hardware devices have no handles */
431 acpi_device_notify(NULL, ACPI_FIXED_HARDWARE_EVENT, device);
432}
433
434static u32 acpi_device_fixed_event(void *data)
435{
436 acpi_os_execute(OSL_NOTIFY_HANDLER, acpi_device_notify_fixed, data);
437 return ACPI_INTERRUPT_HANDLED;
438}
439
440static int acpi_device_install_notify_handler(struct acpi_device *device)
441{
442 acpi_status status;
443
444 if (device->device_type == ACPI_BUS_TYPE_POWER_BUTTON)
445 status =
446 acpi_install_fixed_event_handler(ACPI_EVENT_POWER_BUTTON,
447 acpi_device_fixed_event,
448 device);
449 else if (device->device_type == ACPI_BUS_TYPE_SLEEP_BUTTON)
450 status =
451 acpi_install_fixed_event_handler(ACPI_EVENT_SLEEP_BUTTON,
452 acpi_device_fixed_event,
453 device);
454 else
455 status = acpi_install_notify_handler(device->handle,
456 ACPI_DEVICE_NOTIFY,
457 acpi_device_notify,
458 device);
459
460 if (ACPI_FAILURE(status))
461 return -EINVAL;
462 return 0;
463}
464
465static void acpi_device_remove_notify_handler(struct acpi_device *device)
466{
467 if (device->device_type == ACPI_BUS_TYPE_POWER_BUTTON)
468 acpi_remove_fixed_event_handler(ACPI_EVENT_POWER_BUTTON,
469 acpi_device_fixed_event);
470 else if (device->device_type == ACPI_BUS_TYPE_SLEEP_BUTTON)
471 acpi_remove_fixed_event_handler(ACPI_EVENT_SLEEP_BUTTON,
472 acpi_device_fixed_event);
473 else
474 acpi_remove_notify_handler(device->handle, ACPI_DEVICE_NOTIFY,
475 acpi_device_notify);
476}
477
478/* --------------------------------------------------------------------------
479 Device Matching
480 -------------------------------------------------------------------------- */
481
482/**
483 * acpi_get_first_physical_node - Get first physical node of an ACPI device
484 * @adev: ACPI device in question
485 *
486 * Return: First physical node of ACPI device @adev
487 */
488struct device *acpi_get_first_physical_node(struct acpi_device *adev)
489{
490 struct mutex *physical_node_lock = &adev->physical_node_lock;
491 struct device *phys_dev;
492
493 mutex_lock(physical_node_lock);
494 if (list_empty(&adev->physical_node_list)) {
495 phys_dev = NULL;
496 } else {
497 const struct acpi_device_physical_node *node;
498
499 node = list_first_entry(&adev->physical_node_list,
500 struct acpi_device_physical_node, node);
501
502 phys_dev = node->dev;
503 }
504 mutex_unlock(physical_node_lock);
505 return phys_dev;
506}
507
508static struct acpi_device *acpi_primary_dev_companion(struct acpi_device *adev,
509 const struct device *dev)
510{
511 const struct device *phys_dev = acpi_get_first_physical_node(adev);
512
513 return phys_dev && phys_dev == dev ? adev : NULL;
514}
515
516/**
517 * acpi_device_is_first_physical_node - Is given dev first physical node
518 * @adev: ACPI companion device
519 * @dev: Physical device to check
520 *
521 * Function checks if given @dev is the first physical devices attached to
522 * the ACPI companion device. This distinction is needed in some cases
523 * where the same companion device is shared between many physical devices.
524 *
525 * Note that the caller have to provide valid @adev pointer.
526 */
527bool acpi_device_is_first_physical_node(struct acpi_device *adev,
528 const struct device *dev)
529{
530 return !!acpi_primary_dev_companion(adev, dev);
531}
532
533/*
534 * acpi_companion_match() - Can we match via ACPI companion device
535 * @dev: Device in question
536 *
537 * Check if the given device has an ACPI companion and if that companion has
538 * a valid list of PNP IDs, and if the device is the first (primary) physical
539 * device associated with it. Return the companion pointer if that's the case
540 * or NULL otherwise.
541 *
542 * If multiple physical devices are attached to a single ACPI companion, we need
543 * to be careful. The usage scenario for this kind of relationship is that all
544 * of the physical devices in question use resources provided by the ACPI
545 * companion. A typical case is an MFD device where all the sub-devices share
546 * the parent's ACPI companion. In such cases we can only allow the primary
547 * (first) physical device to be matched with the help of the companion's PNP
548 * IDs.
549 *
550 * Additional physical devices sharing the ACPI companion can still use
551 * resources available from it but they will be matched normally using functions
552 * provided by their bus types (and analogously for their modalias).
553 */
554struct acpi_device *acpi_companion_match(const struct device *dev)
555{
556 struct acpi_device *adev;
557
558 adev = ACPI_COMPANION(dev);
559 if (!adev)
560 return NULL;
561
562 if (list_empty(&adev->pnp.ids))
563 return NULL;
564
565 return acpi_primary_dev_companion(adev, dev);
566}
567
568/**
569 * acpi_of_match_device - Match device object using the "compatible" property.
570 * @adev: ACPI device object to match.
571 * @of_match_table: List of device IDs to match against.
572 *
573 * If @dev has an ACPI companion which has ACPI_DT_NAMESPACE_HID in its list of
574 * identifiers and a _DSD object with the "compatible" property, use that
575 * property to match against the given list of identifiers.
576 */
577static bool acpi_of_match_device(struct acpi_device *adev,
578 const struct of_device_id *of_match_table)
579{
580 const union acpi_object *of_compatible, *obj;
581 int i, nval;
582
583 if (!adev)
584 return false;
585
586 of_compatible = adev->data.of_compatible;
587 if (!of_match_table || !of_compatible)
588 return false;
589
590 if (of_compatible->type == ACPI_TYPE_PACKAGE) {
591 nval = of_compatible->package.count;
592 obj = of_compatible->package.elements;
593 } else { /* Must be ACPI_TYPE_STRING. */
594 nval = 1;
595 obj = of_compatible;
596 }
597 /* Now we can look for the driver DT compatible strings */
598 for (i = 0; i < nval; i++, obj++) {
599 const struct of_device_id *id;
600
601 for (id = of_match_table; id->compatible[0]; id++)
602 if (!strcasecmp(obj->string.pointer, id->compatible))
603 return true;
604 }
605
606 return false;
607}
608
609static bool __acpi_match_device_cls(const struct acpi_device_id *id,
610 struct acpi_hardware_id *hwid)
611{
612 int i, msk, byte_shift;
613 char buf[3];
614
615 if (!id->cls)
616 return false;
617
618 /* Apply class-code bitmask, before checking each class-code byte */
619 for (i = 1; i <= 3; i++) {
620 byte_shift = 8 * (3 - i);
621 msk = (id->cls_msk >> byte_shift) & 0xFF;
622 if (!msk)
623 continue;
624
625 sprintf(buf, "%02x", (id->cls >> byte_shift) & msk);
626 if (strncmp(buf, &hwid->id[(i - 1) * 2], 2))
627 return false;
628 }
629 return true;
630}
631
632static const struct acpi_device_id *__acpi_match_device(
633 struct acpi_device *device,
634 const struct acpi_device_id *ids,
635 const struct of_device_id *of_ids)
636{
637 const struct acpi_device_id *id;
638 struct acpi_hardware_id *hwid;
639
640 /*
641 * If the device is not present, it is unnecessary to load device
642 * driver for it.
643 */
644 if (!device || !device->status.present)
645 return NULL;
646
647 list_for_each_entry(hwid, &device->pnp.ids, list) {
648 /* First, check the ACPI/PNP IDs provided by the caller. */
649 for (id = ids; id->id[0] || id->cls; id++) {
650 if (id->id[0] && !strcmp((char *) id->id, hwid->id))
651 return id;
652 else if (id->cls && __acpi_match_device_cls(id, hwid))
653 return id;
654 }
655
656 /*
657 * Next, check ACPI_DT_NAMESPACE_HID and try to match the
658 * "compatible" property if found.
659 *
660 * The id returned by the below is not valid, but the only
661 * caller passing non-NULL of_ids here is only interested in
662 * whether or not the return value is NULL.
663 */
664 if (!strcmp(ACPI_DT_NAMESPACE_HID, hwid->id)
665 && acpi_of_match_device(device, of_ids))
666 return id;
667 }
668 return NULL;
669}
670
671/**
672 * acpi_match_device - Match a struct device against a given list of ACPI IDs
673 * @ids: Array of struct acpi_device_id object to match against.
674 * @dev: The device structure to match.
675 *
676 * Check if @dev has a valid ACPI handle and if there is a struct acpi_device
677 * object for that handle and use that object to match against a given list of
678 * device IDs.
679 *
680 * Return a pointer to the first matching ID on success or %NULL on failure.
681 */
682const struct acpi_device_id *acpi_match_device(const struct acpi_device_id *ids,
683 const struct device *dev)
684{
685 return __acpi_match_device(acpi_companion_match(dev), ids, NULL);
686}
687EXPORT_SYMBOL_GPL(acpi_match_device);
688
689int acpi_match_device_ids(struct acpi_device *device,
690 const struct acpi_device_id *ids)
691{
692 return __acpi_match_device(device, ids, NULL) ? 0 : -ENOENT;
693}
694EXPORT_SYMBOL(acpi_match_device_ids);
695
696bool acpi_driver_match_device(struct device *dev,
697 const struct device_driver *drv)
698{
699 if (!drv->acpi_match_table)
700 return acpi_of_match_device(ACPI_COMPANION(dev),
701 drv->of_match_table);
702
703 return !!__acpi_match_device(acpi_companion_match(dev),
704 drv->acpi_match_table, drv->of_match_table);
705}
706EXPORT_SYMBOL_GPL(acpi_driver_match_device);
707
708/* --------------------------------------------------------------------------
709 ACPI Driver Management
710 -------------------------------------------------------------------------- */
711
712/**
713 * acpi_bus_register_driver - register a driver with the ACPI bus
714 * @driver: driver being registered
715 *
716 * Registers a driver with the ACPI bus. Searches the namespace for all
717 * devices that match the driver's criteria and binds. Returns zero for
718 * success or a negative error status for failure.
719 */
720int acpi_bus_register_driver(struct acpi_driver *driver)
721{
722 int ret;
723
724 if (acpi_disabled)
725 return -ENODEV;
726 driver->drv.name = driver->name;
727 driver->drv.bus = &acpi_bus_type;
728 driver->drv.owner = driver->owner;
729
730 ret = driver_register(&driver->drv);
731 return ret;
732}
733
734EXPORT_SYMBOL(acpi_bus_register_driver);
735
736/**
737 * acpi_bus_unregister_driver - unregisters a driver with the ACPI bus
738 * @driver: driver to unregister
739 *
740 * Unregisters a driver with the ACPI bus. Searches the namespace for all
741 * devices that match the driver's criteria and unbinds.
742 */
743void acpi_bus_unregister_driver(struct acpi_driver *driver)
744{
745 driver_unregister(&driver->drv);
746}
747
748EXPORT_SYMBOL(acpi_bus_unregister_driver);
749
750/* --------------------------------------------------------------------------
751 ACPI Bus operations
752 -------------------------------------------------------------------------- */
753
754static int acpi_bus_match(struct device *dev, struct device_driver *drv)
755{
756 struct acpi_device *acpi_dev = to_acpi_device(dev);
757 struct acpi_driver *acpi_drv = to_acpi_driver(drv);
758
759 return acpi_dev->flags.match_driver
760 && !acpi_match_device_ids(acpi_dev, acpi_drv->ids);
761}
762
763static int acpi_device_uevent(struct device *dev, struct kobj_uevent_env *env)
764{
765 return __acpi_device_uevent_modalias(to_acpi_device(dev), env);
766}
767
768static int acpi_device_probe(struct device *dev)
769{
770 struct acpi_device *acpi_dev = to_acpi_device(dev);
771 struct acpi_driver *acpi_drv = to_acpi_driver(dev->driver);
772 int ret;
773
774 if (acpi_dev->handler && !acpi_is_pnp_device(acpi_dev))
775 return -EINVAL;
776
777 if (!acpi_drv->ops.add)
778 return -ENOSYS;
779
780 ret = acpi_drv->ops.add(acpi_dev);
781 if (ret)
782 return ret;
783
784 acpi_dev->driver = acpi_drv;
785 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
786 "Driver [%s] successfully bound to device [%s]\n",
787 acpi_drv->name, acpi_dev->pnp.bus_id));
788
789 if (acpi_drv->ops.notify) {
790 ret = acpi_device_install_notify_handler(acpi_dev);
791 if (ret) {
792 if (acpi_drv->ops.remove)
793 acpi_drv->ops.remove(acpi_dev);
794
795 acpi_dev->driver = NULL;
796 acpi_dev->driver_data = NULL;
797 return ret;
798 }
799 }
800
801 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found driver [%s] for device [%s]\n",
802 acpi_drv->name, acpi_dev->pnp.bus_id));
803 get_device(dev);
804 return 0;
805}
806
807static int acpi_device_remove(struct device * dev)
808{
809 struct acpi_device *acpi_dev = to_acpi_device(dev);
810 struct acpi_driver *acpi_drv = acpi_dev->driver;
811
812 if (acpi_drv) {
813 if (acpi_drv->ops.notify)
814 acpi_device_remove_notify_handler(acpi_dev);
815 if (acpi_drv->ops.remove)
816 acpi_drv->ops.remove(acpi_dev);
817 }
818 acpi_dev->driver = NULL;
819 acpi_dev->driver_data = NULL;
820
821 put_device(dev);
822 return 0;
823}
824
825struct bus_type acpi_bus_type = {
826 .name = "acpi",
827 .match = acpi_bus_match,
828 .probe = acpi_device_probe,
829 .remove = acpi_device_remove,
830 .uevent = acpi_device_uevent,
831};
832
833/* --------------------------------------------------------------------------
834 Initialization/Cleanup
835 -------------------------------------------------------------------------- */
836
837static int __init acpi_bus_init_irq(void)
838{
839 acpi_status status;
840 char *message = NULL;
841
842
843 /*
844 * Let the system know what interrupt model we are using by
845 * evaluating the \_PIC object, if exists.
846 */
847
848 switch (acpi_irq_model) {
849 case ACPI_IRQ_MODEL_PIC:
850 message = "PIC";
851 break;
852 case ACPI_IRQ_MODEL_IOAPIC:
853 message = "IOAPIC";
854 break;
855 case ACPI_IRQ_MODEL_IOSAPIC:
856 message = "IOSAPIC";
857 break;
858 case ACPI_IRQ_MODEL_GIC:
859 message = "GIC";
860 break;
861 case ACPI_IRQ_MODEL_PLATFORM:
862 message = "platform specific model";
863 break;
864 default:
865 printk(KERN_WARNING PREFIX "Unknown interrupt routing model\n");
866 return -ENODEV;
867 }
868
869 printk(KERN_INFO PREFIX "Using %s for interrupt routing\n", message);
870
871 status = acpi_execute_simple_method(NULL, "\\_PIC", acpi_irq_model);
872 if (ACPI_FAILURE(status) && (status != AE_NOT_FOUND)) {
873 ACPI_EXCEPTION((AE_INFO, status, "Evaluating _PIC"));
874 return -ENODEV;
875 }
876
877 return 0;
878}
879
880/**
881 * acpi_early_init - Initialize ACPICA and populate the ACPI namespace.
882 *
883 * The ACPI tables are accessible after this, but the handling of events has not
884 * been initialized and the global lock is not available yet, so AML should not
885 * be executed at this point.
886 *
887 * Doing this before switching the EFI runtime services to virtual mode allows
888 * the EfiBootServices memory to be freed slightly earlier on boot.
889 */
890void __init acpi_early_init(void)
891{
892 acpi_status status;
893
894 if (acpi_disabled)
895 return;
896
897 printk(KERN_INFO PREFIX "Core revision %08x\n", ACPI_CA_VERSION);
898
899 /* It's safe to verify table checksums during late stage */
900 acpi_gbl_verify_table_checksum = TRUE;
901
902 /* enable workarounds, unless strict ACPI spec. compliance */
903 if (!acpi_strict)
904 acpi_gbl_enable_interpreter_slack = TRUE;
905
906 acpi_gbl_permanent_mmap = 1;
907
908 /*
909 * If the machine falls into the DMI check table,
910 * DSDT will be copied to memory
911 */
912 dmi_check_system(dsdt_dmi_table);
913
914 status = acpi_reallocate_root_table();
915 if (ACPI_FAILURE(status)) {
916 printk(KERN_ERR PREFIX
917 "Unable to reallocate ACPI tables\n");
918 goto error0;
919 }
920
921 status = acpi_initialize_subsystem();
922 if (ACPI_FAILURE(status)) {
923 printk(KERN_ERR PREFIX
924 "Unable to initialize the ACPI Interpreter\n");
925 goto error0;
926 }
927
928 status = acpi_load_tables();
929 if (ACPI_FAILURE(status)) {
930 printk(KERN_ERR PREFIX
931 "Unable to load the System Description Tables\n");
932 goto error0;
933 }
934
935#ifdef CONFIG_X86
936 if (!acpi_ioapic) {
937 /* compatible (0) means level (3) */
938 if (!(acpi_sci_flags & ACPI_MADT_TRIGGER_MASK)) {
939 acpi_sci_flags &= ~ACPI_MADT_TRIGGER_MASK;
940 acpi_sci_flags |= ACPI_MADT_TRIGGER_LEVEL;
941 }
942 /* Set PIC-mode SCI trigger type */
943 acpi_pic_sci_set_trigger(acpi_gbl_FADT.sci_interrupt,
944 (acpi_sci_flags & ACPI_MADT_TRIGGER_MASK) >> 2);
945 } else {
946 /*
947 * now that acpi_gbl_FADT is initialized,
948 * update it with result from INT_SRC_OVR parsing
949 */
950 acpi_gbl_FADT.sci_interrupt = acpi_sci_override_gsi;
951 }
952#endif
953 return;
954
955 error0:
956 disable_acpi();
957}
958
959/**
960 * acpi_subsystem_init - Finalize the early initialization of ACPI.
961 *
962 * Switch over the platform to the ACPI mode (if possible), initialize the
963 * handling of ACPI events, install the interrupt and global lock handlers.
964 *
965 * Doing this too early is generally unsafe, but at the same time it needs to be
966 * done before all things that really depend on ACPI. The right spot appears to
967 * be before finalizing the EFI initialization.
968 */
969void __init acpi_subsystem_init(void)
970{
971 acpi_status status;
972
973 if (acpi_disabled)
974 return;
975
976 status = acpi_enable_subsystem(~ACPI_NO_ACPI_ENABLE);
977 if (ACPI_FAILURE(status)) {
978 printk(KERN_ERR PREFIX "Unable to enable ACPI\n");
979 disable_acpi();
980 } else {
981 /*
982 * If the system is using ACPI then we can be reasonably
983 * confident that any regulators are managed by the firmware
984 * so tell the regulator core it has everything it needs to
985 * know.
986 */
987 regulator_has_full_constraints();
988 }
989}
990
991static int __init acpi_bus_init(void)
992{
993 int result;
994 acpi_status status;
995
996 acpi_os_initialize1();
997
998 status = acpi_enable_subsystem(ACPI_NO_ACPI_ENABLE);
999 if (ACPI_FAILURE(status)) {
1000 printk(KERN_ERR PREFIX
1001 "Unable to start the ACPI Interpreter\n");
1002 goto error1;
1003 }
1004
1005 /*
1006 * ACPI 2.0 requires the EC driver to be loaded and work before
1007 * the EC device is found in the namespace (i.e. before acpi_initialize_objects()
1008 * is called).
1009 *
1010 * This is accomplished by looking for the ECDT table, and getting
1011 * the EC parameters out of that.
1012 */
1013 status = acpi_ec_ecdt_probe();
1014 /* Ignore result. Not having an ECDT is not fatal. */
1015
1016 status = acpi_initialize_objects(ACPI_FULL_INITIALIZATION);
1017 if (ACPI_FAILURE(status)) {
1018 printk(KERN_ERR PREFIX "Unable to initialize ACPI objects\n");
1019 goto error1;
1020 }
1021
1022 /* Set capability bits for _OSC under processor scope */
1023 acpi_early_processor_osc();
1024
1025 /*
1026 * _OSC method may exist in module level code,
1027 * so it must be run after ACPI_FULL_INITIALIZATION
1028 */
1029 acpi_bus_osc_support();
1030
1031 /*
1032 * _PDC control method may load dynamic SSDT tables,
1033 * and we need to install the table handler before that.
1034 */
1035 acpi_sysfs_init();
1036
1037 acpi_early_processor_set_pdc();
1038
1039 /*
1040 * Maybe EC region is required at bus_scan/acpi_get_devices. So it
1041 * is necessary to enable it as early as possible.
1042 */
1043 acpi_boot_ec_enable();
1044
1045 printk(KERN_INFO PREFIX "Interpreter enabled\n");
1046
1047 /* Initialize sleep structures */
1048 acpi_sleep_init();
1049
1050 /*
1051 * Get the system interrupt model and evaluate \_PIC.
1052 */
1053 result = acpi_bus_init_irq();
1054 if (result)
1055 goto error1;
1056
1057 /*
1058 * Register the for all standard device notifications.
1059 */
1060 status =
1061 acpi_install_notify_handler(ACPI_ROOT_OBJECT, ACPI_SYSTEM_NOTIFY,
1062 &acpi_bus_notify, NULL);
1063 if (ACPI_FAILURE(status)) {
1064 printk(KERN_ERR PREFIX
1065 "Unable to register for device notifications\n");
1066 goto error1;
1067 }
1068
1069 /*
1070 * Create the top ACPI proc directory
1071 */
1072 acpi_root_dir = proc_mkdir(ACPI_BUS_FILE_ROOT, NULL);
1073
1074 result = bus_register(&acpi_bus_type);
1075 if (!result)
1076 return 0;
1077
1078 /* Mimic structured exception handling */
1079 error1:
1080 acpi_terminate();
1081 return -ENODEV;
1082}
1083
1084struct kobject *acpi_kobj;
1085EXPORT_SYMBOL_GPL(acpi_kobj);
1086
1087static int __init acpi_init(void)
1088{
1089 int result;
1090
1091 if (acpi_disabled) {
1092 printk(KERN_INFO PREFIX "Interpreter disabled.\n");
1093 return -ENODEV;
1094 }
1095
1096 acpi_kobj = kobject_create_and_add("acpi", firmware_kobj);
1097 if (!acpi_kobj) {
1098 printk(KERN_WARNING "%s: kset create error\n", __func__);
1099 acpi_kobj = NULL;
1100 }
1101
1102 init_acpi_device_notify();
1103 result = acpi_bus_init();
1104 if (result) {
1105 disable_acpi();
1106 return result;
1107 }
1108
1109 pci_mmcfg_late_init();
1110 acpi_scan_init();
1111 acpi_ec_init();
1112 acpi_debugfs_init();
1113 acpi_sleep_proc_init();
1114 acpi_wakeup_device_init();
1115 acpi_debugger_init();
1116 return 0;
1117}
1118
1119subsys_initcall(acpi_init);