ACPI / video: Quirk initial backlight level 0
[linux-3.10.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  *  You should have received a copy of the GNU General Public License along
19  *  with this program; if not, write to the Free Software Foundation, Inc.,
20  *  59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
21  *
22  * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
23  */
24
25 #include <linux/module.h>
26 #include <linux/init.h>
27 #include <linux/ioport.h>
28 #include <linux/kernel.h>
29 #include <linux/list.h>
30 #include <linux/sched.h>
31 #include <linux/pm.h>
32 #include <linux/device.h>
33 #include <linux/proc_fs.h>
34 #include <linux/acpi.h>
35 #include <linux/slab.h>
36 #ifdef CONFIG_X86
37 #include <asm/mpspec.h>
38 #endif
39 #include <linux/pci.h>
40 #include <acpi/acpi_bus.h>
41 #include <acpi/acpi_drivers.h>
42 #include <acpi/apei.h>
43 #include <linux/dmi.h>
44 #include <linux/suspend.h>
45
46 #include "internal.h"
47
48 #define _COMPONENT              ACPI_BUS_COMPONENT
49 ACPI_MODULE_NAME("bus");
50
51 struct acpi_device *acpi_root;
52 struct proc_dir_entry *acpi_root_dir;
53 EXPORT_SYMBOL(acpi_root_dir);
54
55 #define STRUCT_TO_INT(s)        (*((int*)&s))
56
57
58 #ifdef CONFIG_X86
59 static int set_copy_dsdt(const struct dmi_system_id *id)
60 {
61         printk(KERN_NOTICE "%s detected - "
62                 "force copy of DSDT to local memory\n", id->ident);
63         acpi_gbl_copy_dsdt_locally = 1;
64         return 0;
65 }
66
67 static struct dmi_system_id dsdt_dmi_table[] __initdata = {
68         /*
69          * Invoke DSDT corruption work-around on all Toshiba Satellite.
70          * https://bugzilla.kernel.org/show_bug.cgi?id=14679
71          */
72         {
73          .callback = set_copy_dsdt,
74          .ident = "TOSHIBA Satellite",
75          .matches = {
76                 DMI_MATCH(DMI_SYS_VENDOR, "TOSHIBA"),
77                 DMI_MATCH(DMI_PRODUCT_NAME, "Satellite"),
78                 },
79         },
80         {}
81 };
82 #else
83 static struct dmi_system_id dsdt_dmi_table[] __initdata = {
84         {}
85 };
86 #endif
87
88 /* --------------------------------------------------------------------------
89                                 Device Management
90    -------------------------------------------------------------------------- */
91
92 int acpi_bus_get_device(acpi_handle handle, struct acpi_device **device)
93 {
94         acpi_status status = AE_OK;
95
96
97         if (!device)
98                 return -EINVAL;
99
100         /* TBD: Support fixed-feature devices */
101
102         status = acpi_get_data(handle, acpi_bus_data_handler, (void **)device);
103         if (ACPI_FAILURE(status) || !*device) {
104                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "No context for object [%p]\n",
105                                   handle));
106                 return -ENODEV;
107         }
108
109         return 0;
110 }
111
112 EXPORT_SYMBOL(acpi_bus_get_device);
113
114 acpi_status acpi_bus_get_status_handle(acpi_handle handle,
115                                        unsigned long long *sta)
116 {
117         acpi_status status;
118
119         status = acpi_evaluate_integer(handle, "_STA", NULL, sta);
120         if (ACPI_SUCCESS(status))
121                 return AE_OK;
122
123         if (status == AE_NOT_FOUND) {
124                 *sta = ACPI_STA_DEVICE_PRESENT | ACPI_STA_DEVICE_ENABLED |
125                        ACPI_STA_DEVICE_UI      | ACPI_STA_DEVICE_FUNCTIONING;
126                 return AE_OK;
127         }
128         return status;
129 }
130
131 int acpi_bus_get_status(struct acpi_device *device)
132 {
133         acpi_status status;
134         unsigned long long sta;
135
136         status = acpi_bus_get_status_handle(device->handle, &sta);
137         if (ACPI_FAILURE(status))
138                 return -ENODEV;
139
140         STRUCT_TO_INT(device->status) = (int) sta;
141
142         if (device->status.functional && !device->status.present) {
143                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Device [%s] status [%08x]: "
144                        "functional but not present;\n",
145                         device->pnp.bus_id,
146                         (u32) STRUCT_TO_INT(device->status)));
147         }
148
149         ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Device [%s] status [%08x]\n",
150                           device->pnp.bus_id,
151                           (u32) STRUCT_TO_INT(device->status)));
152         return 0;
153 }
154 EXPORT_SYMBOL(acpi_bus_get_status);
155
156 void acpi_bus_private_data_handler(acpi_handle handle,
157                                    void *context)
158 {
159         return;
160 }
161 EXPORT_SYMBOL(acpi_bus_private_data_handler);
162
163 int acpi_bus_get_private_data(acpi_handle handle, void **data)
164 {
165         acpi_status status = AE_OK;
166
167         if (!*data)
168                 return -EINVAL;
169
170         status = acpi_get_data(handle, acpi_bus_private_data_handler, data);
171         if (ACPI_FAILURE(status) || !*data) {
172                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "No context for object [%p]\n",
173                                 handle));
174                 return -ENODEV;
175         }
176
177         return 0;
178 }
179 EXPORT_SYMBOL(acpi_bus_get_private_data);
180
181 static void acpi_print_osc_error(acpi_handle handle,
182         struct acpi_osc_context *context, char *error)
183 {
184         struct acpi_buffer buffer = {ACPI_ALLOCATE_BUFFER};
185         int i;
186
187         if (ACPI_FAILURE(acpi_get_name(handle, ACPI_FULL_PATHNAME, &buffer)))
188                 printk(KERN_DEBUG "%s\n", error);
189         else {
190                 printk(KERN_DEBUG "%s:%s\n", (char *)buffer.pointer, error);
191                 kfree(buffer.pointer);
192         }
193         printk(KERN_DEBUG"_OSC request data:");
194         for (i = 0; i < context->cap.length; i += sizeof(u32))
195                 printk("%x ", *((u32 *)(context->cap.pointer + i)));
196         printk("\n");
197 }
198
199 static acpi_status acpi_str_to_uuid(char *str, u8 *uuid)
200 {
201         int i;
202         static int opc_map_to_uuid[16] = {6, 4, 2, 0, 11, 9, 16, 14, 19, 21,
203                 24, 26, 28, 30, 32, 34};
204
205         if (strlen(str) != 36)
206                 return AE_BAD_PARAMETER;
207         for (i = 0; i < 36; i++) {
208                 if (i == 8 || i == 13 || i == 18 || i == 23) {
209                         if (str[i] != '-')
210                                 return AE_BAD_PARAMETER;
211                 } else if (!isxdigit(str[i]))
212                         return AE_BAD_PARAMETER;
213         }
214         for (i = 0; i < 16; i++) {
215                 uuid[i] = hex_to_bin(str[opc_map_to_uuid[i]]) << 4;
216                 uuid[i] |= hex_to_bin(str[opc_map_to_uuid[i] + 1]);
217         }
218         return AE_OK;
219 }
220
221 acpi_status acpi_run_osc(acpi_handle handle, struct acpi_osc_context *context)
222 {
223         acpi_status status;
224         struct acpi_object_list input;
225         union acpi_object in_params[4];
226         union acpi_object *out_obj;
227         u8 uuid[16];
228         u32 errors;
229         struct acpi_buffer output = {ACPI_ALLOCATE_BUFFER, NULL};
230
231         if (!context)
232                 return AE_ERROR;
233         if (ACPI_FAILURE(acpi_str_to_uuid(context->uuid_str, uuid)))
234                 return AE_ERROR;
235         context->ret.length = ACPI_ALLOCATE_BUFFER;
236         context->ret.pointer = NULL;
237
238         /* Setting up input parameters */
239         input.count = 4;
240         input.pointer = in_params;
241         in_params[0].type               = ACPI_TYPE_BUFFER;
242         in_params[0].buffer.length      = 16;
243         in_params[0].buffer.pointer     = uuid;
244         in_params[1].type               = ACPI_TYPE_INTEGER;
245         in_params[1].integer.value      = context->rev;
246         in_params[2].type               = ACPI_TYPE_INTEGER;
247         in_params[2].integer.value      = context->cap.length/sizeof(u32);
248         in_params[3].type               = ACPI_TYPE_BUFFER;
249         in_params[3].buffer.length      = context->cap.length;
250         in_params[3].buffer.pointer     = context->cap.pointer;
251
252         status = acpi_evaluate_object(handle, "_OSC", &input, &output);
253         if (ACPI_FAILURE(status))
254                 return status;
255
256         if (!output.length)
257                 return AE_NULL_OBJECT;
258
259         out_obj = output.pointer;
260         if (out_obj->type != ACPI_TYPE_BUFFER
261                 || out_obj->buffer.length != context->cap.length) {
262                 acpi_print_osc_error(handle, context,
263                         "_OSC evaluation returned wrong type");
264                 status = AE_TYPE;
265                 goto out_kfree;
266         }
267         /* Need to ignore the bit0 in result code */
268         errors = *((u32 *)out_obj->buffer.pointer) & ~(1 << 0);
269         if (errors) {
270                 if (errors & OSC_REQUEST_ERROR)
271                         acpi_print_osc_error(handle, context,
272                                 "_OSC request failed");
273                 if (errors & OSC_INVALID_UUID_ERROR)
274                         acpi_print_osc_error(handle, context,
275                                 "_OSC invalid UUID");
276                 if (errors & OSC_INVALID_REVISION_ERROR)
277                         acpi_print_osc_error(handle, context,
278                                 "_OSC invalid revision");
279                 if (errors & OSC_CAPABILITIES_MASK_ERROR) {
280                         if (((u32 *)context->cap.pointer)[OSC_QUERY_TYPE]
281                             & OSC_QUERY_ENABLE)
282                                 goto out_success;
283                         status = AE_SUPPORT;
284                         goto out_kfree;
285                 }
286                 status = AE_ERROR;
287                 goto out_kfree;
288         }
289 out_success:
290         context->ret.length = out_obj->buffer.length;
291         context->ret.pointer = kmemdup(out_obj->buffer.pointer,
292                                        context->ret.length, GFP_KERNEL);
293         if (!context->ret.pointer) {
294                 status =  AE_NO_MEMORY;
295                 goto out_kfree;
296         }
297         status =  AE_OK;
298
299 out_kfree:
300         kfree(output.pointer);
301         if (status != AE_OK)
302                 context->ret.pointer = NULL;
303         return status;
304 }
305 EXPORT_SYMBOL(acpi_run_osc);
306
307 bool osc_sb_apei_support_acked;
308 static u8 sb_uuid_str[] = "0811B06E-4A27-44F9-8D60-3CBBC22E7B48";
309 static void acpi_bus_osc_support(void)
310 {
311         u32 capbuf[2];
312         struct acpi_osc_context context = {
313                 .uuid_str = sb_uuid_str,
314                 .rev = 1,
315                 .cap.length = 8,
316                 .cap.pointer = capbuf,
317         };
318         acpi_handle handle;
319
320         capbuf[OSC_QUERY_TYPE] = OSC_QUERY_ENABLE;
321         capbuf[OSC_SUPPORT_TYPE] = OSC_SB_PR3_SUPPORT; /* _PR3 is in use */
322 #if defined(CONFIG_ACPI_PROCESSOR_AGGREGATOR) ||\
323                         defined(CONFIG_ACPI_PROCESSOR_AGGREGATOR_MODULE)
324         capbuf[OSC_SUPPORT_TYPE] |= OSC_SB_PAD_SUPPORT;
325 #endif
326
327 #if defined(CONFIG_ACPI_PROCESSOR) || defined(CONFIG_ACPI_PROCESSOR_MODULE)
328         capbuf[OSC_SUPPORT_TYPE] |= OSC_SB_PPC_OST_SUPPORT;
329 #endif
330
331 #ifdef ACPI_HOTPLUG_OST
332         capbuf[OSC_SUPPORT_TYPE] |= OSC_SB_HOTPLUG_OST_SUPPORT;
333 #endif
334
335         if (!ghes_disable)
336                 capbuf[OSC_SUPPORT_TYPE] |= OSC_SB_APEI_SUPPORT;
337         if (ACPI_FAILURE(acpi_get_handle(NULL, "\\_SB", &handle)))
338                 return;
339         if (ACPI_SUCCESS(acpi_run_osc(handle, &context))) {
340                 u32 *capbuf_ret = context.ret.pointer;
341                 if (context.ret.length > OSC_SUPPORT_TYPE)
342                         osc_sb_apei_support_acked =
343                                 capbuf_ret[OSC_SUPPORT_TYPE] & OSC_SB_APEI_SUPPORT;
344                 kfree(context.ret.pointer);
345         }
346         /* do we need to check other returned cap? Sounds no */
347 }
348
349 /* --------------------------------------------------------------------------
350                                 Event Management
351    -------------------------------------------------------------------------- */
352
353 #ifdef CONFIG_ACPI_PROC_EVENT
354 static DEFINE_SPINLOCK(acpi_bus_event_lock);
355
356 LIST_HEAD(acpi_bus_event_list);
357 DECLARE_WAIT_QUEUE_HEAD(acpi_bus_event_queue);
358
359 extern int event_is_open;
360
361 int acpi_bus_generate_proc_event4(const char *device_class, const char *bus_id, u8 type, int data)
362 {
363         struct acpi_bus_event *event;
364         unsigned long flags = 0;
365
366         /* drop event on the floor if no one's listening */
367         if (!event_is_open)
368                 return 0;
369
370         event = kzalloc(sizeof(struct acpi_bus_event), GFP_ATOMIC);
371         if (!event)
372                 return -ENOMEM;
373
374         strcpy(event->device_class, device_class);
375         strcpy(event->bus_id, bus_id);
376         event->type = type;
377         event->data = data;
378
379         spin_lock_irqsave(&acpi_bus_event_lock, flags);
380         list_add_tail(&event->node, &acpi_bus_event_list);
381         spin_unlock_irqrestore(&acpi_bus_event_lock, flags);
382
383         wake_up_interruptible(&acpi_bus_event_queue);
384
385         return 0;
386
387 }
388
389 EXPORT_SYMBOL_GPL(acpi_bus_generate_proc_event4);
390
391 int acpi_bus_generate_proc_event(struct acpi_device *device, u8 type, int data)
392 {
393         if (!device)
394                 return -EINVAL;
395         return acpi_bus_generate_proc_event4(device->pnp.device_class,
396                                              device->pnp.bus_id, type, data);
397 }
398
399 EXPORT_SYMBOL(acpi_bus_generate_proc_event);
400
401 int acpi_bus_receive_event(struct acpi_bus_event *event)
402 {
403         unsigned long flags = 0;
404         struct acpi_bus_event *entry = NULL;
405
406         DECLARE_WAITQUEUE(wait, current);
407
408
409         if (!event)
410                 return -EINVAL;
411
412         if (list_empty(&acpi_bus_event_list)) {
413
414                 set_current_state(TASK_INTERRUPTIBLE);
415                 add_wait_queue(&acpi_bus_event_queue, &wait);
416
417                 if (list_empty(&acpi_bus_event_list))
418                         schedule();
419
420                 remove_wait_queue(&acpi_bus_event_queue, &wait);
421                 set_current_state(TASK_RUNNING);
422
423                 if (signal_pending(current))
424                         return -ERESTARTSYS;
425         }
426
427         spin_lock_irqsave(&acpi_bus_event_lock, flags);
428         if (!list_empty(&acpi_bus_event_list)) {
429                 entry = list_entry(acpi_bus_event_list.next,
430                                    struct acpi_bus_event, node);
431                 list_del(&entry->node);
432         }
433         spin_unlock_irqrestore(&acpi_bus_event_lock, flags);
434
435         if (!entry)
436                 return -ENODEV;
437
438         memcpy(event, entry, sizeof(struct acpi_bus_event));
439
440         kfree(entry);
441
442         return 0;
443 }
444
445 #endif  /* CONFIG_ACPI_PROC_EVENT */
446
447 /* --------------------------------------------------------------------------
448                              Notification Handling
449    -------------------------------------------------------------------------- */
450
451 static void acpi_bus_check_device(acpi_handle handle)
452 {
453         struct acpi_device *device;
454         acpi_status status;
455         struct acpi_device_status old_status;
456
457         if (acpi_bus_get_device(handle, &device))
458                 return;
459         if (!device)
460                 return;
461
462         old_status = device->status;
463
464         /*
465          * Make sure this device's parent is present before we go about
466          * messing with the device.
467          */
468         if (device->parent && !device->parent->status.present) {
469                 device->status = device->parent->status;
470                 return;
471         }
472
473         status = acpi_bus_get_status(device);
474         if (ACPI_FAILURE(status))
475                 return;
476
477         if (STRUCT_TO_INT(old_status) == STRUCT_TO_INT(device->status))
478                 return;
479
480         /*
481          * Device Insertion/Removal
482          */
483         if ((device->status.present) && !(old_status.present)) {
484                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Device insertion detected\n"));
485                 /* TBD: Handle device insertion */
486         } else if (!(device->status.present) && (old_status.present)) {
487                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Device removal detected\n"));
488                 /* TBD: Handle device removal */
489         }
490 }
491
492 static void acpi_bus_check_scope(acpi_handle handle)
493 {
494         /* Status Change? */
495         acpi_bus_check_device(handle);
496
497         /*
498          * TBD: Enumerate child devices within this device's scope and
499          *       run acpi_bus_check_device()'s on them.
500          */
501 }
502
503 static BLOCKING_NOTIFIER_HEAD(acpi_bus_notify_list);
504 int register_acpi_bus_notifier(struct notifier_block *nb)
505 {
506         return blocking_notifier_chain_register(&acpi_bus_notify_list, nb);
507 }
508 EXPORT_SYMBOL_GPL(register_acpi_bus_notifier);
509
510 void unregister_acpi_bus_notifier(struct notifier_block *nb)
511 {
512         blocking_notifier_chain_unregister(&acpi_bus_notify_list, nb);
513 }
514 EXPORT_SYMBOL_GPL(unregister_acpi_bus_notifier);
515
516 /**
517  * acpi_bus_notify
518  * ---------------
519  * Callback for all 'system-level' device notifications (values 0x00-0x7F).
520  */
521 static void acpi_bus_notify(acpi_handle handle, u32 type, void *data)
522 {
523         struct acpi_device *device = NULL;
524         struct acpi_driver *driver;
525
526         ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Notification %#02x to handle %p\n",
527                           type, handle));
528
529         blocking_notifier_call_chain(&acpi_bus_notify_list,
530                 type, (void *)handle);
531
532         switch (type) {
533
534         case ACPI_NOTIFY_BUS_CHECK:
535                 acpi_bus_check_scope(handle);
536                 /*
537                  * TBD: We'll need to outsource certain events to non-ACPI
538                  *      drivers via the device manager (device.c).
539                  */
540                 break;
541
542         case ACPI_NOTIFY_DEVICE_CHECK:
543                 acpi_bus_check_device(handle);
544                 /*
545                  * TBD: We'll need to outsource certain events to non-ACPI
546                  *      drivers via the device manager (device.c).
547                  */
548                 break;
549
550         case ACPI_NOTIFY_DEVICE_WAKE:
551                 /* TBD */
552                 break;
553
554         case ACPI_NOTIFY_EJECT_REQUEST:
555                 /* TBD */
556                 break;
557
558         case ACPI_NOTIFY_DEVICE_CHECK_LIGHT:
559                 /* TBD: Exactly what does 'light' mean? */
560                 break;
561
562         case ACPI_NOTIFY_FREQUENCY_MISMATCH:
563                 /* TBD */
564                 break;
565
566         case ACPI_NOTIFY_BUS_MODE_MISMATCH:
567                 /* TBD */
568                 break;
569
570         case ACPI_NOTIFY_POWER_FAULT:
571                 /* TBD */
572                 break;
573
574         default:
575                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
576                                   "Received unknown/unsupported notification [%08x]\n",
577                                   type));
578                 break;
579         }
580
581         acpi_bus_get_device(handle, &device);
582         if (device) {
583                 driver = device->driver;
584                 if (driver && driver->ops.notify &&
585                     (driver->flags & ACPI_DRIVER_ALL_NOTIFY_EVENTS))
586                         driver->ops.notify(device, type);
587         }
588 }
589
590 /* --------------------------------------------------------------------------
591                              Initialization/Cleanup
592    -------------------------------------------------------------------------- */
593
594 static int __init acpi_bus_init_irq(void)
595 {
596         acpi_status status = AE_OK;
597         union acpi_object arg = { ACPI_TYPE_INTEGER };
598         struct acpi_object_list arg_list = { 1, &arg };
599         char *message = NULL;
600
601
602         /*
603          * Let the system know what interrupt model we are using by
604          * evaluating the \_PIC object, if exists.
605          */
606
607         switch (acpi_irq_model) {
608         case ACPI_IRQ_MODEL_PIC:
609                 message = "PIC";
610                 break;
611         case ACPI_IRQ_MODEL_IOAPIC:
612                 message = "IOAPIC";
613                 break;
614         case ACPI_IRQ_MODEL_IOSAPIC:
615                 message = "IOSAPIC";
616                 break;
617         case ACPI_IRQ_MODEL_PLATFORM:
618                 message = "platform specific model";
619                 break;
620         default:
621                 printk(KERN_WARNING PREFIX "Unknown interrupt routing model\n");
622                 return -ENODEV;
623         }
624
625         printk(KERN_INFO PREFIX "Using %s for interrupt routing\n", message);
626
627         arg.integer.value = acpi_irq_model;
628
629         status = acpi_evaluate_object(NULL, "\\_PIC", &arg_list, NULL);
630         if (ACPI_FAILURE(status) && (status != AE_NOT_FOUND)) {
631                 ACPI_EXCEPTION((AE_INFO, status, "Evaluating _PIC"));
632                 return -ENODEV;
633         }
634
635         return 0;
636 }
637
638 u8 acpi_gbl_permanent_mmap;
639
640
641 void __init acpi_early_init(void)
642 {
643         acpi_status status = AE_OK;
644
645         if (acpi_disabled)
646                 return;
647
648         printk(KERN_INFO PREFIX "Core revision %08x\n", ACPI_CA_VERSION);
649
650         /* enable workarounds, unless strict ACPI spec. compliance */
651         if (!acpi_strict)
652                 acpi_gbl_enable_interpreter_slack = TRUE;
653
654         acpi_gbl_permanent_mmap = 1;
655
656         /*
657          * If the machine falls into the DMI check table,
658          * DSDT will be copied to memory
659          */
660         dmi_check_system(dsdt_dmi_table);
661
662         status = acpi_reallocate_root_table();
663         if (ACPI_FAILURE(status)) {
664                 printk(KERN_ERR PREFIX
665                        "Unable to reallocate ACPI tables\n");
666                 goto error0;
667         }
668
669         status = acpi_initialize_subsystem();
670         if (ACPI_FAILURE(status)) {
671                 printk(KERN_ERR PREFIX
672                        "Unable to initialize the ACPI Interpreter\n");
673                 goto error0;
674         }
675
676         status = acpi_load_tables();
677         if (ACPI_FAILURE(status)) {
678                 printk(KERN_ERR PREFIX
679                        "Unable to load the System Description Tables\n");
680                 goto error0;
681         }
682
683 #ifdef CONFIG_X86
684         if (!acpi_ioapic) {
685                 /* compatible (0) means level (3) */
686                 if (!(acpi_sci_flags & ACPI_MADT_TRIGGER_MASK)) {
687                         acpi_sci_flags &= ~ACPI_MADT_TRIGGER_MASK;
688                         acpi_sci_flags |= ACPI_MADT_TRIGGER_LEVEL;
689                 }
690                 /* Set PIC-mode SCI trigger type */
691                 acpi_pic_sci_set_trigger(acpi_gbl_FADT.sci_interrupt,
692                                          (acpi_sci_flags & ACPI_MADT_TRIGGER_MASK) >> 2);
693         } else {
694                 /*
695                  * now that acpi_gbl_FADT is initialized,
696                  * update it with result from INT_SRC_OVR parsing
697                  */
698                 acpi_gbl_FADT.sci_interrupt = acpi_sci_override_gsi;
699         }
700 #endif
701
702         status = acpi_enable_subsystem(~ACPI_NO_ACPI_ENABLE);
703         if (ACPI_FAILURE(status)) {
704                 printk(KERN_ERR PREFIX "Unable to enable ACPI\n");
705                 goto error0;
706         }
707
708         return;
709
710       error0:
711         disable_acpi();
712         return;
713 }
714
715 static int __init acpi_bus_init(void)
716 {
717         int result = 0;
718         acpi_status status = AE_OK;
719         extern acpi_status acpi_os_initialize1(void);
720
721         acpi_os_initialize1();
722
723         status = acpi_enable_subsystem(ACPI_NO_ACPI_ENABLE);
724         if (ACPI_FAILURE(status)) {
725                 printk(KERN_ERR PREFIX
726                        "Unable to start the ACPI Interpreter\n");
727                 goto error1;
728         }
729
730         /*
731          * ACPI 2.0 requires the EC driver to be loaded and work before
732          * the EC device is found in the namespace (i.e. before acpi_initialize_objects()
733          * is called).
734          *
735          * This is accomplished by looking for the ECDT table, and getting
736          * the EC parameters out of that.
737          */
738         status = acpi_ec_ecdt_probe();
739         /* Ignore result. Not having an ECDT is not fatal. */
740
741         status = acpi_initialize_objects(ACPI_FULL_INITIALIZATION);
742         if (ACPI_FAILURE(status)) {
743                 printk(KERN_ERR PREFIX "Unable to initialize ACPI objects\n");
744                 goto error1;
745         }
746
747         /*
748          * _OSC method may exist in module level code,
749          * so it must be run after ACPI_FULL_INITIALIZATION
750          */
751         acpi_bus_osc_support();
752
753         /*
754          * _PDC control method may load dynamic SSDT tables,
755          * and we need to install the table handler before that.
756          */
757         acpi_sysfs_init();
758
759         acpi_early_processor_set_pdc();
760
761         /*
762          * Maybe EC region is required at bus_scan/acpi_get_devices. So it
763          * is necessary to enable it as early as possible.
764          */
765         acpi_boot_ec_enable();
766
767         printk(KERN_INFO PREFIX "Interpreter enabled\n");
768
769         /* Initialize sleep structures */
770         acpi_sleep_init();
771
772         /*
773          * Get the system interrupt model and evaluate \_PIC.
774          */
775         result = acpi_bus_init_irq();
776         if (result)
777                 goto error1;
778
779         /*
780          * Register the for all standard device notifications.
781          */
782         status =
783             acpi_install_notify_handler(ACPI_ROOT_OBJECT, ACPI_SYSTEM_NOTIFY,
784                                         &acpi_bus_notify, NULL);
785         if (ACPI_FAILURE(status)) {
786                 printk(KERN_ERR PREFIX
787                        "Unable to register for device notifications\n");
788                 goto error1;
789         }
790
791         /*
792          * Create the top ACPI proc directory
793          */
794         acpi_root_dir = proc_mkdir(ACPI_BUS_FILE_ROOT, NULL);
795
796         return 0;
797
798         /* Mimic structured exception handling */
799       error1:
800         acpi_terminate();
801         return -ENODEV;
802 }
803
804 struct kobject *acpi_kobj;
805 EXPORT_SYMBOL_GPL(acpi_kobj);
806
807 static int __init acpi_init(void)
808 {
809         int result;
810
811         if (acpi_disabled) {
812                 printk(KERN_INFO PREFIX "Interpreter disabled.\n");
813                 return -ENODEV;
814         }
815
816         acpi_kobj = kobject_create_and_add("acpi", firmware_kobj);
817         if (!acpi_kobj) {
818                 printk(KERN_WARNING "%s: kset create error\n", __func__);
819                 acpi_kobj = NULL;
820         }
821
822         init_acpi_device_notify();
823         result = acpi_bus_init();
824         if (result) {
825                 disable_acpi();
826                 return result;
827         }
828
829         pci_mmcfg_late_init();
830         acpi_scan_init();
831         acpi_ec_init();
832         acpi_debugfs_init();
833         acpi_sleep_proc_init();
834         acpi_wakeup_device_init();
835         return 0;
836 }
837
838 subsys_initcall(acpi_init);