Merge tag 'keys-misc-20190619' of git://git.kernel.org/pub/scm/linux/kernel/git/dhowe...
[linux-2.6-microblaze.git] / drivers / acpi / bus.c
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
35 ACPI_MODULE_NAME("bus");
36
37 struct acpi_device *acpi_root;
38 struct proc_dir_entry *acpi_root_dir;
39 EXPORT_SYMBOL(acpi_root_dir);
40
41 #ifdef CONFIG_X86
42 #ifdef CONFIG_ACPI_CUSTOM_DSDT
43 static inline int set_copy_dsdt(const struct dmi_system_id *id)
44 {
45         return 0;
46 }
47 #else
48 static 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
57 static 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
78 acpi_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 }
94 EXPORT_SYMBOL_GPL(acpi_bus_get_status_handle);
95
96 int 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 }
128 EXPORT_SYMBOL(acpi_bus_get_status);
129
130 void acpi_bus_private_data_handler(acpi_handle handle,
131                                    void *context)
132 {
133         return;
134 }
135 EXPORT_SYMBOL(acpi_bus_private_data_handler);
136
137 int 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 }
150 EXPORT_SYMBOL_GPL(acpi_bus_attach_private_data);
151
152 int 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 }
167 EXPORT_SYMBOL_GPL(acpi_bus_get_private_data);
168
169 void acpi_bus_detach_private_data(acpi_handle handle)
170 {
171         acpi_detach_data(handle, acpi_bus_private_data_handler);
172 }
173 EXPORT_SYMBOL_GPL(acpi_bus_detach_private_data);
174
175 static 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
189 acpi_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         }
257 out_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
267 out_kfree:
268         kfree(output.pointer);
269         if (status != AE_OK)
270                 context->ret.pointer = NULL;
271         return status;
272 }
273 EXPORT_SYMBOL(acpi_run_osc);
274
275 bool 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  */
281 bool osc_pc_lpi_support_confirmed;
282 EXPORT_SYMBOL_GPL(osc_pc_lpi_support_confirmed);
283
284 static u8 sb_uuid_str[] = "0811B06E-4A27-44F9-8D60-3CBBC22E7B48";
285 static 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  */
342 static 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
416 static 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
423 static 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
431 static 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
437 static 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
462 static 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
480 static 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
500 static 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
511 static 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  */
535 struct 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
555 static 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  */
574 bool 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  */
601 struct 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  */
625 static 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
661 static 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  */
695 void 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 }
701 EXPORT_SYMBOL_GPL(acpi_set_modalias);
702
703 static 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
726 static 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
762 out_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  */
779 const 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 }
787 EXPORT_SYMBOL_GPL(acpi_match_device);
788
789 static 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
800 const 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 }
813 EXPORT_SYMBOL_GPL(acpi_device_get_match_data);
814
815 int 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 }
820 EXPORT_SYMBOL(acpi_match_device_ids);
821
822 bool 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 }
834 EXPORT_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  */
848 int 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
862 EXPORT_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  */
871 void acpi_bus_unregister_driver(struct acpi_driver *driver)
872 {
873         driver_unregister(&driver->drv);
874 }
875
876 EXPORT_SYMBOL(acpi_bus_unregister_driver);
877
878 /* --------------------------------------------------------------------------
879                               ACPI Bus operations
880    -------------------------------------------------------------------------- */
881
882 static 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
891 static 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
896 static 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
935 static 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
953 struct 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
965 static 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  */
1018 void __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  */
1091 void __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
1113 static 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
1120 static 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
1223 struct kobject *acpi_kobj;
1224 EXPORT_SYMBOL_GPL(acpi_kobj);
1225
1226 static 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
1259 subsys_initcall(acpi_init);