GNU Linux-libre 4.4.289-gnu1
[releases.git] / drivers / acpi / bus.c
1 /*
2  *  acpi_bus.c - ACPI Bus Driver ($Revision: 80 $)
3  *
4  *  Copyright (C) 2001, 2002 Paul Diefenbaugh <paul.s.diefenbaugh@intel.com>
5  *
6  * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
7  *
8  *  This program is free software; you can redistribute it and/or modify
9  *  it under the terms of the GNU General Public License as published by
10  *  the Free Software Foundation; either version 2 of the License, or (at
11  *  your option) any later version.
12  *
13  *  This program is distributed in the hope that it will be useful, but
14  *  WITHOUT ANY WARRANTY; without even the implied warranty of
15  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
16  *  General Public License for more details.
17  *
18  * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
19  */
20
21 #include <linux/module.h>
22 #include <linux/init.h>
23 #include <linux/ioport.h>
24 #include <linux/kernel.h>
25 #include <linux/list.h>
26 #include <linux/sched.h>
27 #include <linux/pm.h>
28 #include <linux/device.h>
29 #include <linux/proc_fs.h>
30 #include <linux/acpi.h>
31 #include <linux/slab.h>
32 #include <linux/regulator/machine.h>
33 #ifdef CONFIG_X86
34 #include <asm/mpspec.h>
35 #endif
36 #include <linux/pci.h>
37 #include <acpi/apei.h>
38 #include <linux/dmi.h>
39 #include <linux/suspend.h>
40
41 #include "internal.h"
42
43 #define _COMPONENT              ACPI_BUS_COMPONENT
44 ACPI_MODULE_NAME("bus");
45
46 struct acpi_device *acpi_root;
47 struct proc_dir_entry *acpi_root_dir;
48 EXPORT_SYMBOL(acpi_root_dir);
49
50 #ifdef CONFIG_X86
51 #ifdef CONFIG_ACPI_CUSTOM_DSDT
52 static inline int set_copy_dsdt(const struct dmi_system_id *id)
53 {
54         return 0;
55 }
56 #else
57 static int set_copy_dsdt(const struct dmi_system_id *id)
58 {
59         printk(KERN_NOTICE "%s detected - "
60                 "force copy of DSDT to local memory\n", id->ident);
61         acpi_gbl_copy_dsdt_locally = 1;
62         return 0;
63 }
64 #endif
65
66 static struct dmi_system_id dsdt_dmi_table[] __initdata = {
67         /*
68          * Invoke DSDT corruption work-around on all Toshiba Satellite.
69          * https://bugzilla.kernel.org/show_bug.cgi?id=14679
70          */
71         {
72          .callback = set_copy_dsdt,
73          .ident = "TOSHIBA Satellite",
74          .matches = {
75                 DMI_MATCH(DMI_SYS_VENDOR, "TOSHIBA"),
76                 DMI_MATCH(DMI_PRODUCT_NAME, "Satellite"),
77                 },
78         },
79         {}
80 };
81 #else
82 static struct dmi_system_id dsdt_dmi_table[] __initdata = {
83         {}
84 };
85 #endif
86
87 /* --------------------------------------------------------------------------
88                                 Device Management
89    -------------------------------------------------------------------------- */
90
91 acpi_status acpi_bus_get_status_handle(acpi_handle handle,
92                                        unsigned long long *sta)
93 {
94         acpi_status status;
95
96         status = acpi_evaluate_integer(handle, "_STA", NULL, sta);
97         if (ACPI_SUCCESS(status))
98                 return AE_OK;
99
100         if (status == AE_NOT_FOUND) {
101                 *sta = ACPI_STA_DEVICE_PRESENT | ACPI_STA_DEVICE_ENABLED |
102                        ACPI_STA_DEVICE_UI      | ACPI_STA_DEVICE_FUNCTIONING;
103                 return AE_OK;
104         }
105         return status;
106 }
107
108 int acpi_bus_get_status(struct acpi_device *device)
109 {
110         acpi_status status;
111         unsigned long long sta;
112
113         status = acpi_bus_get_status_handle(device->handle, &sta);
114         if (ACPI_FAILURE(status))
115                 return -ENODEV;
116
117         acpi_set_device_status(device, sta);
118
119         if (device->status.functional && !device->status.present) {
120                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Device [%s] status [%08x]: "
121                        "functional but not present;\n",
122                         device->pnp.bus_id, (u32)sta));
123         }
124
125         ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Device [%s] status [%08x]\n",
126                           device->pnp.bus_id, (u32)sta));
127         return 0;
128 }
129 EXPORT_SYMBOL(acpi_bus_get_status);
130
131 void acpi_bus_private_data_handler(acpi_handle handle,
132                                    void *context)
133 {
134         return;
135 }
136 EXPORT_SYMBOL(acpi_bus_private_data_handler);
137
138 int acpi_bus_attach_private_data(acpi_handle handle, void *data)
139 {
140         acpi_status status;
141
142         status = acpi_attach_data(handle,
143                         acpi_bus_private_data_handler, data);
144         if (ACPI_FAILURE(status)) {
145                 acpi_handle_debug(handle, "Error attaching device data\n");
146                 return -ENODEV;
147         }
148
149         return 0;
150 }
151 EXPORT_SYMBOL_GPL(acpi_bus_attach_private_data);
152
153 int acpi_bus_get_private_data(acpi_handle handle, void **data)
154 {
155         acpi_status status;
156
157         if (!data)
158                 return -EINVAL;
159
160         status = acpi_get_data(handle, acpi_bus_private_data_handler, data);
161         if (ACPI_FAILURE(status)) {
162                 acpi_handle_debug(handle, "No context for object\n");
163                 return -ENODEV;
164         }
165
166         return 0;
167 }
168 EXPORT_SYMBOL_GPL(acpi_bus_get_private_data);
169
170 void acpi_bus_detach_private_data(acpi_handle handle)
171 {
172         acpi_detach_data(handle, acpi_bus_private_data_handler);
173 }
174 EXPORT_SYMBOL_GPL(acpi_bus_detach_private_data);
175
176 static void acpi_print_osc_error(acpi_handle handle,
177         struct acpi_osc_context *context, char *error)
178 {
179         struct acpi_buffer buffer = {ACPI_ALLOCATE_BUFFER};
180         int i;
181
182         if (ACPI_FAILURE(acpi_get_name(handle, ACPI_FULL_PATHNAME, &buffer)))
183                 printk(KERN_DEBUG "%s\n", error);
184         else {
185                 printk(KERN_DEBUG "%s:%s\n", (char *)buffer.pointer, error);
186                 kfree(buffer.pointer);
187         }
188         printk(KERN_DEBUG"_OSC request data:");
189         for (i = 0; i < context->cap.length; i += sizeof(u32))
190                 printk("%x ", *((u32 *)(context->cap.pointer + i)));
191         printk("\n");
192 }
193
194 acpi_status acpi_str_to_uuid(char *str, u8 *uuid)
195 {
196         int i;
197         static int opc_map_to_uuid[16] = {6, 4, 2, 0, 11, 9, 16, 14, 19, 21,
198                 24, 26, 28, 30, 32, 34};
199
200         if (strlen(str) != 36)
201                 return AE_BAD_PARAMETER;
202         for (i = 0; i < 36; i++) {
203                 if (i == 8 || i == 13 || i == 18 || i == 23) {
204                         if (str[i] != '-')
205                                 return AE_BAD_PARAMETER;
206                 } else if (!isxdigit(str[i]))
207                         return AE_BAD_PARAMETER;
208         }
209         for (i = 0; i < 16; i++) {
210                 uuid[i] = hex_to_bin(str[opc_map_to_uuid[i]]) << 4;
211                 uuid[i] |= hex_to_bin(str[opc_map_to_uuid[i] + 1]);
212         }
213         return AE_OK;
214 }
215 EXPORT_SYMBOL_GPL(acpi_str_to_uuid);
216
217 acpi_status acpi_run_osc(acpi_handle handle, struct acpi_osc_context *context)
218 {
219         acpi_status status;
220         struct acpi_object_list input;
221         union acpi_object in_params[4];
222         union acpi_object *out_obj;
223         u8 uuid[16];
224         u32 errors;
225         struct acpi_buffer output = {ACPI_ALLOCATE_BUFFER, NULL};
226
227         if (!context)
228                 return AE_ERROR;
229         if (ACPI_FAILURE(acpi_str_to_uuid(context->uuid_str, uuid)))
230                 return AE_ERROR;
231         context->ret.length = ACPI_ALLOCATE_BUFFER;
232         context->ret.pointer = NULL;
233
234         /* Setting up input parameters */
235         input.count = 4;
236         input.pointer = in_params;
237         in_params[0].type               = ACPI_TYPE_BUFFER;
238         in_params[0].buffer.length      = 16;
239         in_params[0].buffer.pointer     = uuid;
240         in_params[1].type               = ACPI_TYPE_INTEGER;
241         in_params[1].integer.value      = context->rev;
242         in_params[2].type               = ACPI_TYPE_INTEGER;
243         in_params[2].integer.value      = context->cap.length/sizeof(u32);
244         in_params[3].type               = ACPI_TYPE_BUFFER;
245         in_params[3].buffer.length      = context->cap.length;
246         in_params[3].buffer.pointer     = context->cap.pointer;
247
248         status = acpi_evaluate_object(handle, "_OSC", &input, &output);
249         if (ACPI_FAILURE(status))
250                 return status;
251
252         if (!output.length)
253                 return AE_NULL_OBJECT;
254
255         out_obj = output.pointer;
256         if (out_obj->type != ACPI_TYPE_BUFFER
257                 || out_obj->buffer.length != context->cap.length) {
258                 acpi_print_osc_error(handle, context,
259                         "_OSC evaluation returned wrong type");
260                 status = AE_TYPE;
261                 goto out_kfree;
262         }
263         /* Need to ignore the bit0 in result code */
264         errors = *((u32 *)out_obj->buffer.pointer) & ~(1 << 0);
265         if (errors) {
266                 if (errors & OSC_REQUEST_ERROR)
267                         acpi_print_osc_error(handle, context,
268                                 "_OSC request failed");
269                 if (errors & OSC_INVALID_UUID_ERROR)
270                         acpi_print_osc_error(handle, context,
271                                 "_OSC invalid UUID");
272                 if (errors & OSC_INVALID_REVISION_ERROR)
273                         acpi_print_osc_error(handle, context,
274                                 "_OSC invalid revision");
275                 if (errors & OSC_CAPABILITIES_MASK_ERROR) {
276                         if (((u32 *)context->cap.pointer)[OSC_QUERY_DWORD]
277                             & OSC_QUERY_ENABLE)
278                                 goto out_success;
279                         status = AE_SUPPORT;
280                         goto out_kfree;
281                 }
282                 status = AE_ERROR;
283                 goto out_kfree;
284         }
285 out_success:
286         context->ret.length = out_obj->buffer.length;
287         context->ret.pointer = kmemdup(out_obj->buffer.pointer,
288                                        context->ret.length, GFP_KERNEL);
289         if (!context->ret.pointer) {
290                 status =  AE_NO_MEMORY;
291                 goto out_kfree;
292         }
293         status =  AE_OK;
294
295 out_kfree:
296         kfree(output.pointer);
297         if (status != AE_OK)
298                 context->ret.pointer = NULL;
299         return status;
300 }
301 EXPORT_SYMBOL(acpi_run_osc);
302
303 bool osc_sb_apei_support_acked;
304 static u8 sb_uuid_str[] = "0811B06E-4A27-44F9-8D60-3CBBC22E7B48";
305 static void acpi_bus_osc_support(void)
306 {
307         u32 capbuf[2];
308         struct acpi_osc_context context = {
309                 .uuid_str = sb_uuid_str,
310                 .rev = 1,
311                 .cap.length = 8,
312                 .cap.pointer = capbuf,
313         };
314         acpi_handle handle;
315
316         capbuf[OSC_QUERY_DWORD] = OSC_QUERY_ENABLE;
317         capbuf[OSC_SUPPORT_DWORD] = OSC_SB_PR3_SUPPORT; /* _PR3 is in use */
318         if (IS_ENABLED(CONFIG_ACPI_PROCESSOR_AGGREGATOR))
319                 capbuf[OSC_SUPPORT_DWORD] |= OSC_SB_PAD_SUPPORT;
320         if (IS_ENABLED(CONFIG_ACPI_PROCESSOR))
321                 capbuf[OSC_SUPPORT_DWORD] |= OSC_SB_PPC_OST_SUPPORT;
322
323         capbuf[OSC_SUPPORT_DWORD] |= OSC_SB_HOTPLUG_OST_SUPPORT;
324
325         if (!ghes_disable)
326                 capbuf[OSC_SUPPORT_DWORD] |= OSC_SB_APEI_SUPPORT;
327         if (ACPI_FAILURE(acpi_get_handle(NULL, "\\_SB", &handle)))
328                 return;
329         if (ACPI_SUCCESS(acpi_run_osc(handle, &context))) {
330                 u32 *capbuf_ret = context.ret.pointer;
331                 if (context.ret.length > OSC_SUPPORT_DWORD)
332                         osc_sb_apei_support_acked =
333                                 capbuf_ret[OSC_SUPPORT_DWORD] & OSC_SB_APEI_SUPPORT;
334                 kfree(context.ret.pointer);
335         }
336         /* do we need to check other returned cap? Sounds no */
337 }
338
339 /* --------------------------------------------------------------------------
340                              Notification Handling
341    -------------------------------------------------------------------------- */
342
343 /**
344  * acpi_bus_notify
345  * ---------------
346  * Callback for all 'system-level' device notifications (values 0x00-0x7F).
347  */
348 static void acpi_bus_notify(acpi_handle handle, u32 type, void *data)
349 {
350         struct acpi_device *adev;
351         struct acpi_driver *driver;
352         u32 ost_code = ACPI_OST_SC_NON_SPECIFIC_FAILURE;
353         bool hotplug_event = false;
354
355         switch (type) {
356         case ACPI_NOTIFY_BUS_CHECK:
357                 acpi_handle_debug(handle, "ACPI_NOTIFY_BUS_CHECK event\n");
358                 hotplug_event = true;
359                 break;
360
361         case ACPI_NOTIFY_DEVICE_CHECK:
362                 acpi_handle_debug(handle, "ACPI_NOTIFY_DEVICE_CHECK event\n");
363                 hotplug_event = true;
364                 break;
365
366         case ACPI_NOTIFY_DEVICE_WAKE:
367                 acpi_handle_debug(handle, "ACPI_NOTIFY_DEVICE_WAKE event\n");
368                 break;
369
370         case ACPI_NOTIFY_EJECT_REQUEST:
371                 acpi_handle_debug(handle, "ACPI_NOTIFY_EJECT_REQUEST event\n");
372                 hotplug_event = true;
373                 break;
374
375         case ACPI_NOTIFY_DEVICE_CHECK_LIGHT:
376                 acpi_handle_debug(handle, "ACPI_NOTIFY_DEVICE_CHECK_LIGHT event\n");
377                 /* TBD: Exactly what does 'light' mean? */
378                 break;
379
380         case ACPI_NOTIFY_FREQUENCY_MISMATCH:
381                 acpi_handle_err(handle, "Device cannot be configured due "
382                                 "to a frequency mismatch\n");
383                 break;
384
385         case ACPI_NOTIFY_BUS_MODE_MISMATCH:
386                 acpi_handle_err(handle, "Device cannot be configured due "
387                                 "to a bus mode mismatch\n");
388                 break;
389
390         case ACPI_NOTIFY_POWER_FAULT:
391                 acpi_handle_err(handle, "Device has suffered a power fault\n");
392                 break;
393
394         default:
395                 acpi_handle_debug(handle, "Unknown event type 0x%x\n", type);
396                 break;
397         }
398
399         adev = acpi_bus_get_acpi_device(handle);
400         if (!adev)
401                 goto err;
402
403         driver = adev->driver;
404         if (driver && driver->ops.notify &&
405             (driver->flags & ACPI_DRIVER_ALL_NOTIFY_EVENTS))
406                 driver->ops.notify(adev, type);
407
408         if (hotplug_event && ACPI_SUCCESS(acpi_hotplug_schedule(adev, type)))
409                 return;
410
411         acpi_bus_put_acpi_device(adev);
412         return;
413
414  err:
415         acpi_evaluate_ost(handle, type, ost_code, NULL);
416 }
417
418 static void acpi_device_notify(acpi_handle handle, u32 event, void *data)
419 {
420         struct acpi_device *device = data;
421
422         device->driver->ops.notify(device, event);
423 }
424
425 static void acpi_device_notify_fixed(void *data)
426 {
427         struct acpi_device *device = data;
428
429         /* Fixed hardware devices have no handles */
430         acpi_device_notify(NULL, ACPI_FIXED_HARDWARE_EVENT, device);
431 }
432
433 static u32 acpi_device_fixed_event(void *data)
434 {
435         acpi_os_execute(OSL_NOTIFY_HANDLER, acpi_device_notify_fixed, data);
436         return ACPI_INTERRUPT_HANDLED;
437 }
438
439 static int acpi_device_install_notify_handler(struct acpi_device *device)
440 {
441         acpi_status status;
442
443         if (device->device_type == ACPI_BUS_TYPE_POWER_BUTTON)
444                 status =
445                     acpi_install_fixed_event_handler(ACPI_EVENT_POWER_BUTTON,
446                                                      acpi_device_fixed_event,
447                                                      device);
448         else if (device->device_type == ACPI_BUS_TYPE_SLEEP_BUTTON)
449                 status =
450                     acpi_install_fixed_event_handler(ACPI_EVENT_SLEEP_BUTTON,
451                                                      acpi_device_fixed_event,
452                                                      device);
453         else
454                 status = acpi_install_notify_handler(device->handle,
455                                                      ACPI_DEVICE_NOTIFY,
456                                                      acpi_device_notify,
457                                                      device);
458
459         if (ACPI_FAILURE(status))
460                 return -EINVAL;
461         return 0;
462 }
463
464 static void acpi_device_remove_notify_handler(struct acpi_device *device)
465 {
466         if (device->device_type == ACPI_BUS_TYPE_POWER_BUTTON)
467                 acpi_remove_fixed_event_handler(ACPI_EVENT_POWER_BUTTON,
468                                                 acpi_device_fixed_event);
469         else if (device->device_type == ACPI_BUS_TYPE_SLEEP_BUTTON)
470                 acpi_remove_fixed_event_handler(ACPI_EVENT_SLEEP_BUTTON,
471                                                 acpi_device_fixed_event);
472         else
473                 acpi_remove_notify_handler(device->handle, ACPI_DEVICE_NOTIFY,
474                                            acpi_device_notify);
475 }
476
477 /* --------------------------------------------------------------------------
478                              Device Matching
479    -------------------------------------------------------------------------- */
480
481 static struct acpi_device *acpi_primary_dev_companion(struct acpi_device *adev,
482                                                       const struct device *dev)
483 {
484         struct mutex *physical_node_lock = &adev->physical_node_lock;
485
486         mutex_lock(physical_node_lock);
487         if (list_empty(&adev->physical_node_list)) {
488                 adev = NULL;
489         } else {
490                 const struct acpi_device_physical_node *node;
491
492                 node = list_first_entry(&adev->physical_node_list,
493                                         struct acpi_device_physical_node, node);
494                 if (node->dev != dev)
495                         adev = NULL;
496         }
497         mutex_unlock(physical_node_lock);
498         return adev;
499 }
500
501 /**
502  * acpi_device_is_first_physical_node - Is given dev first physical node
503  * @adev: ACPI companion device
504  * @dev: Physical device to check
505  *
506  * Function checks if given @dev is the first physical devices attached to
507  * the ACPI companion device. This distinction is needed in some cases
508  * where the same companion device is shared between many physical devices.
509  *
510  * Note that the caller have to provide valid @adev pointer.
511  */
512 bool acpi_device_is_first_physical_node(struct acpi_device *adev,
513                                         const struct device *dev)
514 {
515         return !!acpi_primary_dev_companion(adev, dev);
516 }
517
518 /*
519  * acpi_companion_match() - Can we match via ACPI companion device
520  * @dev: Device in question
521  *
522  * Check if the given device has an ACPI companion and if that companion has
523  * a valid list of PNP IDs, and if the device is the first (primary) physical
524  * device associated with it.  Return the companion pointer if that's the case
525  * or NULL otherwise.
526  *
527  * If multiple physical devices are attached to a single ACPI companion, we need
528  * to be careful.  The usage scenario for this kind of relationship is that all
529  * of the physical devices in question use resources provided by the ACPI
530  * companion.  A typical case is an MFD device where all the sub-devices share
531  * the parent's ACPI companion.  In such cases we can only allow the primary
532  * (first) physical device to be matched with the help of the companion's PNP
533  * IDs.
534  *
535  * Additional physical devices sharing the ACPI companion can still use
536  * resources available from it but they will be matched normally using functions
537  * provided by their bus types (and analogously for their modalias).
538  */
539 struct acpi_device *acpi_companion_match(const struct device *dev)
540 {
541         struct acpi_device *adev;
542
543         adev = ACPI_COMPANION(dev);
544         if (!adev)
545                 return NULL;
546
547         if (list_empty(&adev->pnp.ids))
548                 return NULL;
549
550         return acpi_primary_dev_companion(adev, dev);
551 }
552
553 /**
554  * acpi_of_match_device - Match device object using the "compatible" property.
555  * @adev: ACPI device object to match.
556  * @of_match_table: List of device IDs to match against.
557  *
558  * If @dev has an ACPI companion which has ACPI_DT_NAMESPACE_HID in its list of
559  * identifiers and a _DSD object with the "compatible" property, use that
560  * property to match against the given list of identifiers.
561  */
562 static bool acpi_of_match_device(struct acpi_device *adev,
563                                  const struct of_device_id *of_match_table)
564 {
565         const union acpi_object *of_compatible, *obj;
566         int i, nval;
567
568         if (!adev)
569                 return false;
570
571         of_compatible = adev->data.of_compatible;
572         if (!of_match_table || !of_compatible)
573                 return false;
574
575         if (of_compatible->type == ACPI_TYPE_PACKAGE) {
576                 nval = of_compatible->package.count;
577                 obj = of_compatible->package.elements;
578         } else { /* Must be ACPI_TYPE_STRING. */
579                 nval = 1;
580                 obj = of_compatible;
581         }
582         /* Now we can look for the driver DT compatible strings */
583         for (i = 0; i < nval; i++, obj++) {
584                 const struct of_device_id *id;
585
586                 for (id = of_match_table; id->compatible[0]; id++)
587                         if (!strcasecmp(obj->string.pointer, id->compatible))
588                                 return true;
589         }
590
591         return false;
592 }
593
594 static bool __acpi_match_device_cls(const struct acpi_device_id *id,
595                                     struct acpi_hardware_id *hwid)
596 {
597         int i, msk, byte_shift;
598         char buf[3];
599
600         if (!id->cls)
601                 return false;
602
603         /* Apply class-code bitmask, before checking each class-code byte */
604         for (i = 1; i <= 3; i++) {
605                 byte_shift = 8 * (3 - i);
606                 msk = (id->cls_msk >> byte_shift) & 0xFF;
607                 if (!msk)
608                         continue;
609
610                 sprintf(buf, "%02x", (id->cls >> byte_shift) & msk);
611                 if (strncmp(buf, &hwid->id[(i - 1) * 2], 2))
612                         return false;
613         }
614         return true;
615 }
616
617 static const struct acpi_device_id *__acpi_match_device(
618         struct acpi_device *device,
619         const struct acpi_device_id *ids,
620         const struct of_device_id *of_ids)
621 {
622         const struct acpi_device_id *id;
623         struct acpi_hardware_id *hwid;
624
625         /*
626          * If the device is not present, it is unnecessary to load device
627          * driver for it.
628          */
629         if (!device || !device->status.present)
630                 return NULL;
631
632         list_for_each_entry(hwid, &device->pnp.ids, list) {
633                 /* First, check the ACPI/PNP IDs provided by the caller. */
634                 for (id = ids; id->id[0] || id->cls; id++) {
635                         if (id->id[0] && !strcmp((char *) id->id, hwid->id))
636                                 return id;
637                         else if (id->cls && __acpi_match_device_cls(id, hwid))
638                                 return id;
639                 }
640
641                 /*
642                  * Next, check ACPI_DT_NAMESPACE_HID and try to match the
643                  * "compatible" property if found.
644                  *
645                  * The id returned by the below is not valid, but the only
646                  * caller passing non-NULL of_ids here is only interested in
647                  * whether or not the return value is NULL.
648                  */
649                 if (!strcmp(ACPI_DT_NAMESPACE_HID, hwid->id)
650                     && acpi_of_match_device(device, of_ids))
651                         return id;
652         }
653         return NULL;
654 }
655
656 /**
657  * acpi_match_device - Match a struct device against a given list of ACPI IDs
658  * @ids: Array of struct acpi_device_id object to match against.
659  * @dev: The device structure to match.
660  *
661  * Check if @dev has a valid ACPI handle and if there is a struct acpi_device
662  * object for that handle and use that object to match against a given list of
663  * device IDs.
664  *
665  * Return a pointer to the first matching ID on success or %NULL on failure.
666  */
667 const struct acpi_device_id *acpi_match_device(const struct acpi_device_id *ids,
668                                                const struct device *dev)
669 {
670         return __acpi_match_device(acpi_companion_match(dev), ids, NULL);
671 }
672 EXPORT_SYMBOL_GPL(acpi_match_device);
673
674 int acpi_match_device_ids(struct acpi_device *device,
675                           const struct acpi_device_id *ids)
676 {
677         return __acpi_match_device(device, ids, NULL) ? 0 : -ENOENT;
678 }
679 EXPORT_SYMBOL(acpi_match_device_ids);
680
681 bool acpi_driver_match_device(struct device *dev,
682                               const struct device_driver *drv)
683 {
684         if (!drv->acpi_match_table)
685                 return acpi_of_match_device(ACPI_COMPANION(dev),
686                                             drv->of_match_table);
687
688         return !!__acpi_match_device(acpi_companion_match(dev),
689                                      drv->acpi_match_table, drv->of_match_table);
690 }
691 EXPORT_SYMBOL_GPL(acpi_driver_match_device);
692
693 /* --------------------------------------------------------------------------
694                               ACPI Driver Management
695    -------------------------------------------------------------------------- */
696
697 /**
698  * acpi_bus_register_driver - register a driver with the ACPI bus
699  * @driver: driver being registered
700  *
701  * Registers a driver with the ACPI bus.  Searches the namespace for all
702  * devices that match the driver's criteria and binds.  Returns zero for
703  * success or a negative error status for failure.
704  */
705 int acpi_bus_register_driver(struct acpi_driver *driver)
706 {
707         int ret;
708
709         if (acpi_disabled)
710                 return -ENODEV;
711         driver->drv.name = driver->name;
712         driver->drv.bus = &acpi_bus_type;
713         driver->drv.owner = driver->owner;
714
715         ret = driver_register(&driver->drv);
716         return ret;
717 }
718
719 EXPORT_SYMBOL(acpi_bus_register_driver);
720
721 /**
722  * acpi_bus_unregister_driver - unregisters a driver with the ACPI bus
723  * @driver: driver to unregister
724  *
725  * Unregisters a driver with the ACPI bus.  Searches the namespace for all
726  * devices that match the driver's criteria and unbinds.
727  */
728 void acpi_bus_unregister_driver(struct acpi_driver *driver)
729 {
730         driver_unregister(&driver->drv);
731 }
732
733 EXPORT_SYMBOL(acpi_bus_unregister_driver);
734
735 /* --------------------------------------------------------------------------
736                               ACPI Bus operations
737    -------------------------------------------------------------------------- */
738
739 static int acpi_bus_match(struct device *dev, struct device_driver *drv)
740 {
741         struct acpi_device *acpi_dev = to_acpi_device(dev);
742         struct acpi_driver *acpi_drv = to_acpi_driver(drv);
743
744         return acpi_dev->flags.match_driver
745                 && !acpi_match_device_ids(acpi_dev, acpi_drv->ids);
746 }
747
748 static int acpi_device_uevent(struct device *dev, struct kobj_uevent_env *env)
749 {
750         return __acpi_device_uevent_modalias(to_acpi_device(dev), env);
751 }
752
753 static int acpi_device_probe(struct device *dev)
754 {
755         struct acpi_device *acpi_dev = to_acpi_device(dev);
756         struct acpi_driver *acpi_drv = to_acpi_driver(dev->driver);
757         int ret;
758
759         if (acpi_dev->handler && !acpi_is_pnp_device(acpi_dev))
760                 return -EINVAL;
761
762         if (!acpi_drv->ops.add)
763                 return -ENOSYS;
764
765         ret = acpi_drv->ops.add(acpi_dev);
766         if (ret)
767                 return ret;
768
769         acpi_dev->driver = acpi_drv;
770         ACPI_DEBUG_PRINT((ACPI_DB_INFO,
771                           "Driver [%s] successfully bound to device [%s]\n",
772                           acpi_drv->name, acpi_dev->pnp.bus_id));
773
774         if (acpi_drv->ops.notify) {
775                 ret = acpi_device_install_notify_handler(acpi_dev);
776                 if (ret) {
777                         if (acpi_drv->ops.remove)
778                                 acpi_drv->ops.remove(acpi_dev);
779
780                         acpi_dev->driver = NULL;
781                         acpi_dev->driver_data = NULL;
782                         return ret;
783                 }
784         }
785
786         ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found driver [%s] for device [%s]\n",
787                           acpi_drv->name, acpi_dev->pnp.bus_id));
788         get_device(dev);
789         return 0;
790 }
791
792 static int acpi_device_remove(struct device * dev)
793 {
794         struct acpi_device *acpi_dev = to_acpi_device(dev);
795         struct acpi_driver *acpi_drv = acpi_dev->driver;
796
797         if (acpi_drv) {
798                 if (acpi_drv->ops.notify)
799                         acpi_device_remove_notify_handler(acpi_dev);
800                 if (acpi_drv->ops.remove)
801                         acpi_drv->ops.remove(acpi_dev);
802         }
803         acpi_dev->driver = NULL;
804         acpi_dev->driver_data = NULL;
805
806         put_device(dev);
807         return 0;
808 }
809
810 struct bus_type acpi_bus_type = {
811         .name           = "acpi",
812         .match          = acpi_bus_match,
813         .probe          = acpi_device_probe,
814         .remove         = acpi_device_remove,
815         .uevent         = acpi_device_uevent,
816 };
817
818 /* --------------------------------------------------------------------------
819                              Initialization/Cleanup
820    -------------------------------------------------------------------------- */
821
822 static int __init acpi_bus_init_irq(void)
823 {
824         acpi_status status;
825         char *message = NULL;
826
827
828         /*
829          * Let the system know what interrupt model we are using by
830          * evaluating the \_PIC object, if exists.
831          */
832
833         switch (acpi_irq_model) {
834         case ACPI_IRQ_MODEL_PIC:
835                 message = "PIC";
836                 break;
837         case ACPI_IRQ_MODEL_IOAPIC:
838                 message = "IOAPIC";
839                 break;
840         case ACPI_IRQ_MODEL_IOSAPIC:
841                 message = "IOSAPIC";
842                 break;
843         case ACPI_IRQ_MODEL_GIC:
844                 message = "GIC";
845                 break;
846         case ACPI_IRQ_MODEL_PLATFORM:
847                 message = "platform specific model";
848                 break;
849         default:
850                 printk(KERN_WARNING PREFIX "Unknown interrupt routing model\n");
851                 return -ENODEV;
852         }
853
854         printk(KERN_INFO PREFIX "Using %s for interrupt routing\n", message);
855
856         status = acpi_execute_simple_method(NULL, "\\_PIC", acpi_irq_model);
857         if (ACPI_FAILURE(status) && (status != AE_NOT_FOUND)) {
858                 ACPI_EXCEPTION((AE_INFO, status, "Evaluating _PIC"));
859                 return -ENODEV;
860         }
861
862         return 0;
863 }
864
865 /**
866  * acpi_early_init - Initialize ACPICA and populate the ACPI namespace.
867  *
868  * The ACPI tables are accessible after this, but the handling of events has not
869  * been initialized and the global lock is not available yet, so AML should not
870  * be executed at this point.
871  *
872  * Doing this before switching the EFI runtime services to virtual mode allows
873  * the EfiBootServices memory to be freed slightly earlier on boot.
874  */
875 void __init acpi_early_init(void)
876 {
877         acpi_status status;
878
879         if (acpi_disabled)
880                 return;
881
882         printk(KERN_INFO PREFIX "Core revision %08x\n", ACPI_CA_VERSION);
883
884         /* It's safe to verify table checksums during late stage */
885         acpi_gbl_verify_table_checksum = TRUE;
886
887         /* enable workarounds, unless strict ACPI spec. compliance */
888         if (!acpi_strict)
889                 acpi_gbl_enable_interpreter_slack = TRUE;
890
891         acpi_gbl_permanent_mmap = 1;
892
893         /*
894          * If the machine falls into the DMI check table,
895          * DSDT will be copied to memory
896          */
897         dmi_check_system(dsdt_dmi_table);
898
899         status = acpi_reallocate_root_table();
900         if (ACPI_FAILURE(status)) {
901                 printk(KERN_ERR PREFIX
902                        "Unable to reallocate ACPI tables\n");
903                 goto error0;
904         }
905
906         status = acpi_initialize_subsystem();
907         if (ACPI_FAILURE(status)) {
908                 printk(KERN_ERR PREFIX
909                        "Unable to initialize the ACPI Interpreter\n");
910                 goto error0;
911         }
912
913         status = acpi_load_tables();
914         if (ACPI_FAILURE(status)) {
915                 printk(KERN_ERR PREFIX
916                        "Unable to load the System Description Tables\n");
917                 goto error0;
918         }
919
920 #ifdef CONFIG_X86
921         if (!acpi_ioapic) {
922                 /* compatible (0) means level (3) */
923                 if (!(acpi_sci_flags & ACPI_MADT_TRIGGER_MASK)) {
924                         acpi_sci_flags &= ~ACPI_MADT_TRIGGER_MASK;
925                         acpi_sci_flags |= ACPI_MADT_TRIGGER_LEVEL;
926                 }
927                 /* Set PIC-mode SCI trigger type */
928                 acpi_pic_sci_set_trigger(acpi_gbl_FADT.sci_interrupt,
929                                          (acpi_sci_flags & ACPI_MADT_TRIGGER_MASK) >> 2);
930         } else {
931                 /*
932                  * now that acpi_gbl_FADT is initialized,
933                  * update it with result from INT_SRC_OVR parsing
934                  */
935                 acpi_gbl_FADT.sci_interrupt = acpi_sci_override_gsi;
936         }
937 #endif
938         return;
939
940  error0:
941         disable_acpi();
942 }
943
944 /**
945  * acpi_subsystem_init - Finalize the early initialization of ACPI.
946  *
947  * Switch over the platform to the ACPI mode (if possible), initialize the
948  * handling of ACPI events, install the interrupt and global lock handlers.
949  *
950  * Doing this too early is generally unsafe, but at the same time it needs to be
951  * done before all things that really depend on ACPI.  The right spot appears to
952  * be before finalizing the EFI initialization.
953  */
954 void __init acpi_subsystem_init(void)
955 {
956         acpi_status status;
957
958         if (acpi_disabled)
959                 return;
960
961         status = acpi_enable_subsystem(~ACPI_NO_ACPI_ENABLE);
962         if (ACPI_FAILURE(status)) {
963                 printk(KERN_ERR PREFIX "Unable to enable ACPI\n");
964                 disable_acpi();
965         } else {
966                 /*
967                  * If the system is using ACPI then we can be reasonably
968                  * confident that any regulators are managed by the firmware
969                  * so tell the regulator core it has everything it needs to
970                  * know.
971                  */
972                 regulator_has_full_constraints();
973         }
974 }
975
976 static int __init acpi_bus_init(void)
977 {
978         int result;
979         acpi_status status;
980
981         acpi_os_initialize1();
982
983         status = acpi_enable_subsystem(ACPI_NO_ACPI_ENABLE);
984         if (ACPI_FAILURE(status)) {
985                 printk(KERN_ERR PREFIX
986                        "Unable to start the ACPI Interpreter\n");
987                 goto error1;
988         }
989
990         /*
991          * ACPI 2.0 requires the EC driver to be loaded and work before
992          * the EC device is found in the namespace (i.e. before acpi_initialize_objects()
993          * is called).
994          *
995          * This is accomplished by looking for the ECDT table, and getting
996          * the EC parameters out of that.
997          */
998         status = acpi_ec_ecdt_probe();
999         /* Ignore result. Not having an ECDT is not fatal. */
1000
1001         status = acpi_initialize_objects(ACPI_FULL_INITIALIZATION);
1002         if (ACPI_FAILURE(status)) {
1003                 printk(KERN_ERR PREFIX "Unable to initialize ACPI objects\n");
1004                 goto error1;
1005         }
1006
1007         /* Set capability bits for _OSC under processor scope */
1008         acpi_early_processor_osc();
1009
1010         /*
1011          * _OSC method may exist in module level code,
1012          * so it must be run after ACPI_FULL_INITIALIZATION
1013          */
1014         acpi_bus_osc_support();
1015
1016         /*
1017          * _PDC control method may load dynamic SSDT tables,
1018          * and we need to install the table handler before that.
1019          */
1020         acpi_sysfs_init();
1021
1022         acpi_early_processor_set_pdc();
1023
1024         /*
1025          * Maybe EC region is required at bus_scan/acpi_get_devices. So it
1026          * is necessary to enable it as early as possible.
1027          */
1028         acpi_boot_ec_enable();
1029
1030         printk(KERN_INFO PREFIX "Interpreter enabled\n");
1031
1032         /* Initialize sleep structures */
1033         acpi_sleep_init();
1034
1035         /*
1036          * Get the system interrupt model and evaluate \_PIC.
1037          */
1038         result = acpi_bus_init_irq();
1039         if (result)
1040                 goto error1;
1041
1042         /*
1043          * Register the for all standard device notifications.
1044          */
1045         status =
1046             acpi_install_notify_handler(ACPI_ROOT_OBJECT, ACPI_SYSTEM_NOTIFY,
1047                                         &acpi_bus_notify, NULL);
1048         if (ACPI_FAILURE(status)) {
1049                 printk(KERN_ERR PREFIX
1050                        "Unable to register for device notifications\n");
1051                 goto error1;
1052         }
1053
1054         /*
1055          * Create the top ACPI proc directory
1056          */
1057         acpi_root_dir = proc_mkdir(ACPI_BUS_FILE_ROOT, NULL);
1058
1059         result = bus_register(&acpi_bus_type);
1060         if (!result)
1061                 return 0;
1062
1063         /* Mimic structured exception handling */
1064       error1:
1065         acpi_terminate();
1066         return -ENODEV;
1067 }
1068
1069 struct kobject *acpi_kobj;
1070 EXPORT_SYMBOL_GPL(acpi_kobj);
1071
1072 static int __init acpi_init(void)
1073 {
1074         int result;
1075
1076         if (acpi_disabled) {
1077                 printk(KERN_INFO PREFIX "Interpreter disabled.\n");
1078                 return -ENODEV;
1079         }
1080
1081         acpi_kobj = kobject_create_and_add("acpi", firmware_kobj);
1082         if (!acpi_kobj) {
1083                 printk(KERN_WARNING "%s: kset create error\n", __func__);
1084                 acpi_kobj = NULL;
1085         }
1086
1087         init_acpi_device_notify();
1088         result = acpi_bus_init();
1089         if (result) {
1090                 kobject_put(acpi_kobj);
1091                 disable_acpi();
1092                 return result;
1093         }
1094
1095         pci_mmcfg_late_init();
1096         acpi_scan_init();
1097         acpi_ec_init();
1098         acpi_debugfs_init();
1099         acpi_sleep_proc_init();
1100         acpi_wakeup_device_init();
1101         return 0;
1102 }
1103
1104 subsys_initcall(acpi_init);