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ACPI: processor: call _PDC early
[linux-2.6.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 #ifdef CONFIG_X86
36 #include <asm/mpspec.h>
37 #endif
38 #include <linux/pci.h>
39 #include <acpi/acpi_bus.h>
40 #include <acpi/acpi_drivers.h>
41 #include <linux/dmi.h>
42
43 #include "internal.h"
44
45 #define _COMPONENT              ACPI_BUS_COMPONENT
46 ACPI_MODULE_NAME("bus");
47
48 struct acpi_device *acpi_root;
49 struct proc_dir_entry *acpi_root_dir;
50 EXPORT_SYMBOL(acpi_root_dir);
51
52 #define STRUCT_TO_INT(s)        (*((int*)&s))
53
54 static int set_power_nocheck(const struct dmi_system_id *id)
55 {
56         printk(KERN_NOTICE PREFIX "%s detected - "
57                 "disable power check in power transistion\n", id->ident);
58         acpi_power_nocheck = 1;
59         return 0;
60 }
61 static struct dmi_system_id __cpuinitdata power_nocheck_dmi_table[] = {
62         {
63         set_power_nocheck, "HP Pavilion 05", {
64         DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies LTD"),
65         DMI_MATCH(DMI_SYS_VENDOR, "HP Pavilion 05"),
66         DMI_MATCH(DMI_PRODUCT_VERSION, "2001211RE101GLEND") }, NULL},
67         {},
68 };
69
70
71 /* --------------------------------------------------------------------------
72                                 Device Management
73    -------------------------------------------------------------------------- */
74
75 int acpi_bus_get_device(acpi_handle handle, struct acpi_device **device)
76 {
77         acpi_status status = AE_OK;
78
79
80         if (!device)
81                 return -EINVAL;
82
83         /* TBD: Support fixed-feature devices */
84
85         status = acpi_get_data(handle, acpi_bus_data_handler, (void **)device);
86         if (ACPI_FAILURE(status) || !*device) {
87                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "No context for object [%p]\n",
88                                   handle));
89                 return -ENODEV;
90         }
91
92         return 0;
93 }
94
95 EXPORT_SYMBOL(acpi_bus_get_device);
96
97 acpi_status acpi_bus_get_status_handle(acpi_handle handle,
98                                        unsigned long long *sta)
99 {
100         acpi_status status;
101
102         status = acpi_evaluate_integer(handle, "_STA", NULL, sta);
103         if (ACPI_SUCCESS(status))
104                 return AE_OK;
105
106         if (status == AE_NOT_FOUND) {
107                 *sta = ACPI_STA_DEVICE_PRESENT | ACPI_STA_DEVICE_ENABLED |
108                        ACPI_STA_DEVICE_UI      | ACPI_STA_DEVICE_FUNCTIONING;
109                 return AE_OK;
110         }
111         return status;
112 }
113
114 int acpi_bus_get_status(struct acpi_device *device)
115 {
116         acpi_status status;
117         unsigned long long sta;
118
119         status = acpi_bus_get_status_handle(device->handle, &sta);
120         if (ACPI_FAILURE(status))
121                 return -ENODEV;
122
123         STRUCT_TO_INT(device->status) = (int) sta;
124
125         if (device->status.functional && !device->status.present) {
126                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Device [%s] status [%08x]: "
127                        "functional but not present;\n",
128                         device->pnp.bus_id,
129                         (u32) STRUCT_TO_INT(device->status)));
130         }
131
132         ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Device [%s] status [%08x]\n",
133                           device->pnp.bus_id,
134                           (u32) STRUCT_TO_INT(device->status)));
135         return 0;
136 }
137 EXPORT_SYMBOL(acpi_bus_get_status);
138
139 void acpi_bus_private_data_handler(acpi_handle handle,
140                                    void *context)
141 {
142         return;
143 }
144 EXPORT_SYMBOL(acpi_bus_private_data_handler);
145
146 int acpi_bus_get_private_data(acpi_handle handle, void **data)
147 {
148         acpi_status status = AE_OK;
149
150         if (!*data)
151                 return -EINVAL;
152
153         status = acpi_get_data(handle, acpi_bus_private_data_handler, data);
154         if (ACPI_FAILURE(status) || !*data) {
155                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "No context for object [%p]\n",
156                                 handle));
157                 return -ENODEV;
158         }
159
160         return 0;
161 }
162 EXPORT_SYMBOL(acpi_bus_get_private_data);
163
164 /* --------------------------------------------------------------------------
165                                  Power Management
166    -------------------------------------------------------------------------- */
167
168 int acpi_bus_get_power(acpi_handle handle, int *state)
169 {
170         int result = 0;
171         acpi_status status = 0;
172         struct acpi_device *device = NULL;
173         unsigned long long psc = 0;
174
175
176         result = acpi_bus_get_device(handle, &device);
177         if (result)
178                 return result;
179
180         *state = ACPI_STATE_UNKNOWN;
181
182         if (!device->flags.power_manageable) {
183                 /* TBD: Non-recursive algorithm for walking up hierarchy */
184                 if (device->parent)
185                         *state = device->parent->power.state;
186                 else
187                         *state = ACPI_STATE_D0;
188         } else {
189                 /*
190                  * Get the device's power state either directly (via _PSC) or
191                  * indirectly (via power resources).
192                  */
193                 if (device->power.flags.explicit_get) {
194                         status = acpi_evaluate_integer(device->handle, "_PSC",
195                                                        NULL, &psc);
196                         if (ACPI_FAILURE(status))
197                                 return -ENODEV;
198                         device->power.state = (int)psc;
199                 } else if (device->power.flags.power_resources) {
200                         result = acpi_power_get_inferred_state(device);
201                         if (result)
202                                 return result;
203                 }
204
205                 *state = device->power.state;
206         }
207
208         ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Device [%s] power state is D%d\n",
209                           device->pnp.bus_id, device->power.state));
210
211         return 0;
212 }
213
214 EXPORT_SYMBOL(acpi_bus_get_power);
215
216 int acpi_bus_set_power(acpi_handle handle, int state)
217 {
218         int result = 0;
219         acpi_status status = AE_OK;
220         struct acpi_device *device = NULL;
221         char object_name[5] = { '_', 'P', 'S', '0' + state, '\0' };
222
223
224         result = acpi_bus_get_device(handle, &device);
225         if (result)
226                 return result;
227
228         if ((state < ACPI_STATE_D0) || (state > ACPI_STATE_D3))
229                 return -EINVAL;
230
231         /* Make sure this is a valid target state */
232
233         if (!device->flags.power_manageable) {
234                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Device `[%s]' is not power manageable\n",
235                                 kobject_name(&device->dev.kobj)));
236                 return -ENODEV;
237         }
238         /*
239          * Get device's current power state
240          */
241         if (!acpi_power_nocheck) {
242                 /*
243                  * Maybe the incorrect power state is returned on the bogus
244                  * bios, which is different with the real power state.
245                  * For example: the bios returns D0 state and the real power
246                  * state is D3. OS expects to set the device to D0 state. In
247                  * such case if OS uses the power state returned by the BIOS,
248                  * the device can't be transisted to the correct power state.
249                  * So if the acpi_power_nocheck is set, it is unnecessary to
250                  * get the power state by calling acpi_bus_get_power.
251                  */
252                 acpi_bus_get_power(device->handle, &device->power.state);
253         }
254         if ((state == device->power.state) && !device->flags.force_power_state) {
255                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Device is already at D%d\n",
256                                   state));
257                 return 0;
258         }
259
260         if (!device->power.states[state].flags.valid) {
261                 printk(KERN_WARNING PREFIX "Device does not support D%d\n", state);
262                 return -ENODEV;
263         }
264         if (device->parent && (state < device->parent->power.state)) {
265                 printk(KERN_WARNING PREFIX
266                               "Cannot set device to a higher-powered"
267                               " state than parent\n");
268                 return -ENODEV;
269         }
270
271         /*
272          * Transition Power
273          * ----------------
274          * On transitions to a high-powered state we first apply power (via
275          * power resources) then evalute _PSx.  Conversly for transitions to
276          * a lower-powered state.
277          */
278         if (state < device->power.state) {
279                 if (device->power.flags.power_resources) {
280                         result = acpi_power_transition(device, state);
281                         if (result)
282                                 goto end;
283                 }
284                 if (device->power.states[state].flags.explicit_set) {
285                         status = acpi_evaluate_object(device->handle,
286                                                       object_name, NULL, NULL);
287                         if (ACPI_FAILURE(status)) {
288                                 result = -ENODEV;
289                                 goto end;
290                         }
291                 }
292         } else {
293                 if (device->power.states[state].flags.explicit_set) {
294                         status = acpi_evaluate_object(device->handle,
295                                                       object_name, NULL, NULL);
296                         if (ACPI_FAILURE(status)) {
297                                 result = -ENODEV;
298                                 goto end;
299                         }
300                 }
301                 if (device->power.flags.power_resources) {
302                         result = acpi_power_transition(device, state);
303                         if (result)
304                                 goto end;
305                 }
306         }
307
308       end:
309         if (result)
310                 printk(KERN_WARNING PREFIX
311                               "Device [%s] failed to transition to D%d\n",
312                               device->pnp.bus_id, state);
313         else {
314                 device->power.state = state;
315                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
316                                   "Device [%s] transitioned to D%d\n",
317                                   device->pnp.bus_id, state));
318         }
319
320         return result;
321 }
322
323 EXPORT_SYMBOL(acpi_bus_set_power);
324
325 bool acpi_bus_power_manageable(acpi_handle handle)
326 {
327         struct acpi_device *device;
328         int result;
329
330         result = acpi_bus_get_device(handle, &device);
331         return result ? false : device->flags.power_manageable;
332 }
333
334 EXPORT_SYMBOL(acpi_bus_power_manageable);
335
336 bool acpi_bus_can_wakeup(acpi_handle handle)
337 {
338         struct acpi_device *device;
339         int result;
340
341         result = acpi_bus_get_device(handle, &device);
342         return result ? false : device->wakeup.flags.valid;
343 }
344
345 EXPORT_SYMBOL(acpi_bus_can_wakeup);
346
347 static void acpi_print_osc_error(acpi_handle handle,
348         struct acpi_osc_context *context, char *error)
349 {
350         struct acpi_buffer buffer = {ACPI_ALLOCATE_BUFFER};
351         int i;
352
353         if (ACPI_FAILURE(acpi_get_name(handle, ACPI_FULL_PATHNAME, &buffer)))
354                 printk(KERN_DEBUG "%s\n", error);
355         else {
356                 printk(KERN_DEBUG "%s:%s\n", (char *)buffer.pointer, error);
357                 kfree(buffer.pointer);
358         }
359         printk(KERN_DEBUG"_OSC request data:");
360         for (i = 0; i < context->cap.length; i += sizeof(u32))
361                 printk("%x ", *((u32 *)(context->cap.pointer + i)));
362         printk("\n");
363 }
364
365 static u8 hex_val(unsigned char c)
366 {
367         return isdigit(c) ? c - '0' : toupper(c) - 'A' + 10;
368 }
369
370 static acpi_status acpi_str_to_uuid(char *str, u8 *uuid)
371 {
372         int i;
373         static int opc_map_to_uuid[16] = {6, 4, 2, 0, 11, 9, 16, 14, 19, 21,
374                 24, 26, 28, 30, 32, 34};
375
376         if (strlen(str) != 36)
377                 return AE_BAD_PARAMETER;
378         for (i = 0; i < 36; i++) {
379                 if (i == 8 || i == 13 || i == 18 || i == 23) {
380                         if (str[i] != '-')
381                                 return AE_BAD_PARAMETER;
382                 } else if (!isxdigit(str[i]))
383                         return AE_BAD_PARAMETER;
384         }
385         for (i = 0; i < 16; i++) {
386                 uuid[i] = hex_val(str[opc_map_to_uuid[i]]) << 4;
387                 uuid[i] |= hex_val(str[opc_map_to_uuid[i] + 1]);
388         }
389         return AE_OK;
390 }
391
392 acpi_status acpi_run_osc(acpi_handle handle, struct acpi_osc_context *context)
393 {
394         acpi_status status;
395         struct acpi_object_list input;
396         union acpi_object in_params[4];
397         union acpi_object *out_obj;
398         u8 uuid[16];
399         u32 errors;
400
401         if (!context)
402                 return AE_ERROR;
403         if (ACPI_FAILURE(acpi_str_to_uuid(context->uuid_str, uuid)))
404                 return AE_ERROR;
405         context->ret.length = ACPI_ALLOCATE_BUFFER;
406         context->ret.pointer = NULL;
407
408         /* Setting up input parameters */
409         input.count = 4;
410         input.pointer = in_params;
411         in_params[0].type               = ACPI_TYPE_BUFFER;
412         in_params[0].buffer.length      = 16;
413         in_params[0].buffer.pointer     = uuid;
414         in_params[1].type               = ACPI_TYPE_INTEGER;
415         in_params[1].integer.value      = context->rev;
416         in_params[2].type               = ACPI_TYPE_INTEGER;
417         in_params[2].integer.value      = context->cap.length/sizeof(u32);
418         in_params[3].type               = ACPI_TYPE_BUFFER;
419         in_params[3].buffer.length      = context->cap.length;
420         in_params[3].buffer.pointer     = context->cap.pointer;
421
422         status = acpi_evaluate_object(handle, "_OSC", &input, &context->ret);
423         if (ACPI_FAILURE(status))
424                 return status;
425
426         /* return buffer should have the same length as cap buffer */
427         if (context->ret.length != context->cap.length)
428                 return AE_NULL_OBJECT;
429
430         out_obj = context->ret.pointer;
431         if (out_obj->type != ACPI_TYPE_BUFFER) {
432                 acpi_print_osc_error(handle, context,
433                         "_OSC evaluation returned wrong type");
434                 status = AE_TYPE;
435                 goto out_kfree;
436         }
437         /* Need to ignore the bit0 in result code */
438         errors = *((u32 *)out_obj->buffer.pointer) & ~(1 << 0);
439         if (errors) {
440                 if (errors & OSC_REQUEST_ERROR)
441                         acpi_print_osc_error(handle, context,
442                                 "_OSC request failed");
443                 if (errors & OSC_INVALID_UUID_ERROR)
444                         acpi_print_osc_error(handle, context,
445                                 "_OSC invalid UUID");
446                 if (errors & OSC_INVALID_REVISION_ERROR)
447                         acpi_print_osc_error(handle, context,
448                                 "_OSC invalid revision");
449                 if (errors & OSC_CAPABILITIES_MASK_ERROR) {
450                         if (((u32 *)context->cap.pointer)[OSC_QUERY_TYPE]
451                             & OSC_QUERY_ENABLE)
452                                 goto out_success;
453                         status = AE_SUPPORT;
454                         goto out_kfree;
455                 }
456                 status = AE_ERROR;
457                 goto out_kfree;
458         }
459 out_success:
460         return AE_OK;
461
462 out_kfree:
463         kfree(context->ret.pointer);
464         context->ret.pointer = NULL;
465         return status;
466 }
467 EXPORT_SYMBOL(acpi_run_osc);
468
469 static u8 sb_uuid_str[] = "0811B06E-4A27-44F9-8D60-3CBBC22E7B48";
470 static void acpi_bus_osc_support(void)
471 {
472         u32 capbuf[2];
473         struct acpi_osc_context context = {
474                 .uuid_str = sb_uuid_str,
475                 .rev = 1,
476                 .cap.length = 8,
477                 .cap.pointer = capbuf,
478         };
479         acpi_handle handle;
480
481         capbuf[OSC_QUERY_TYPE] = OSC_QUERY_ENABLE;
482         capbuf[OSC_SUPPORT_TYPE] = OSC_SB_PR3_SUPPORT; /* _PR3 is in use */
483 #ifdef CONFIG_ACPI_PROCESSOR_AGGREGATOR
484         capbuf[OSC_SUPPORT_TYPE] |= OSC_SB_PAD_SUPPORT;
485 #endif
486         if (ACPI_FAILURE(acpi_get_handle(NULL, "\\_SB", &handle)))
487                 return;
488         if (ACPI_SUCCESS(acpi_run_osc(handle, &context)))
489                 kfree(context.ret.pointer);
490         /* do we need to check the returned cap? Sounds no */
491 }
492
493 /* --------------------------------------------------------------------------
494                                 Event Management
495    -------------------------------------------------------------------------- */
496
497 #ifdef CONFIG_ACPI_PROC_EVENT
498 static DEFINE_SPINLOCK(acpi_bus_event_lock);
499
500 LIST_HEAD(acpi_bus_event_list);
501 DECLARE_WAIT_QUEUE_HEAD(acpi_bus_event_queue);
502
503 extern int event_is_open;
504
505 int acpi_bus_generate_proc_event4(const char *device_class, const char *bus_id, u8 type, int data)
506 {
507         struct acpi_bus_event *event;
508         unsigned long flags = 0;
509
510         /* drop event on the floor if no one's listening */
511         if (!event_is_open)
512                 return 0;
513
514         event = kmalloc(sizeof(struct acpi_bus_event), GFP_ATOMIC);
515         if (!event)
516                 return -ENOMEM;
517
518         strcpy(event->device_class, device_class);
519         strcpy(event->bus_id, bus_id);
520         event->type = type;
521         event->data = data;
522
523         spin_lock_irqsave(&acpi_bus_event_lock, flags);
524         list_add_tail(&event->node, &acpi_bus_event_list);
525         spin_unlock_irqrestore(&acpi_bus_event_lock, flags);
526
527         wake_up_interruptible(&acpi_bus_event_queue);
528
529         return 0;
530
531 }
532
533 EXPORT_SYMBOL_GPL(acpi_bus_generate_proc_event4);
534
535 int acpi_bus_generate_proc_event(struct acpi_device *device, u8 type, int data)
536 {
537         if (!device)
538                 return -EINVAL;
539         return acpi_bus_generate_proc_event4(device->pnp.device_class,
540                                              device->pnp.bus_id, type, data);
541 }
542
543 EXPORT_SYMBOL(acpi_bus_generate_proc_event);
544
545 int acpi_bus_receive_event(struct acpi_bus_event *event)
546 {
547         unsigned long flags = 0;
548         struct acpi_bus_event *entry = NULL;
549
550         DECLARE_WAITQUEUE(wait, current);
551
552
553         if (!event)
554                 return -EINVAL;
555
556         if (list_empty(&acpi_bus_event_list)) {
557
558                 set_current_state(TASK_INTERRUPTIBLE);
559                 add_wait_queue(&acpi_bus_event_queue, &wait);
560
561                 if (list_empty(&acpi_bus_event_list))
562                         schedule();
563
564                 remove_wait_queue(&acpi_bus_event_queue, &wait);
565                 set_current_state(TASK_RUNNING);
566
567                 if (signal_pending(current))
568                         return -ERESTARTSYS;
569         }
570
571         spin_lock_irqsave(&acpi_bus_event_lock, flags);
572         if (!list_empty(&acpi_bus_event_list)) {
573                 entry = list_entry(acpi_bus_event_list.next,
574                                    struct acpi_bus_event, node);
575                 list_del(&entry->node);
576         }
577         spin_unlock_irqrestore(&acpi_bus_event_lock, flags);
578
579         if (!entry)
580                 return -ENODEV;
581
582         memcpy(event, entry, sizeof(struct acpi_bus_event));
583
584         kfree(entry);
585
586         return 0;
587 }
588
589 #endif  /* CONFIG_ACPI_PROC_EVENT */
590
591 /* --------------------------------------------------------------------------
592                              Notification Handling
593    -------------------------------------------------------------------------- */
594
595 static void acpi_bus_check_device(acpi_handle handle)
596 {
597         struct acpi_device *device;
598         acpi_status status;
599         struct acpi_device_status old_status;
600
601         if (acpi_bus_get_device(handle, &device))
602                 return;
603         if (!device)
604                 return;
605
606         old_status = device->status;
607
608         /*
609          * Make sure this device's parent is present before we go about
610          * messing with the device.
611          */
612         if (device->parent && !device->parent->status.present) {
613                 device->status = device->parent->status;
614                 return;
615         }
616
617         status = acpi_bus_get_status(device);
618         if (ACPI_FAILURE(status))
619                 return;
620
621         if (STRUCT_TO_INT(old_status) == STRUCT_TO_INT(device->status))
622                 return;
623
624         /*
625          * Device Insertion/Removal
626          */
627         if ((device->status.present) && !(old_status.present)) {
628                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Device insertion detected\n"));
629                 /* TBD: Handle device insertion */
630         } else if (!(device->status.present) && (old_status.present)) {
631                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Device removal detected\n"));
632                 /* TBD: Handle device removal */
633         }
634 }
635
636 static void acpi_bus_check_scope(acpi_handle handle)
637 {
638         /* Status Change? */
639         acpi_bus_check_device(handle);
640
641         /*
642          * TBD: Enumerate child devices within this device's scope and
643          *       run acpi_bus_check_device()'s on them.
644          */
645 }
646
647 static BLOCKING_NOTIFIER_HEAD(acpi_bus_notify_list);
648 int register_acpi_bus_notifier(struct notifier_block *nb)
649 {
650         return blocking_notifier_chain_register(&acpi_bus_notify_list, nb);
651 }
652 EXPORT_SYMBOL_GPL(register_acpi_bus_notifier);
653
654 void unregister_acpi_bus_notifier(struct notifier_block *nb)
655 {
656         blocking_notifier_chain_unregister(&acpi_bus_notify_list, nb);
657 }
658 EXPORT_SYMBOL_GPL(unregister_acpi_bus_notifier);
659
660 /**
661  * acpi_bus_notify
662  * ---------------
663  * Callback for all 'system-level' device notifications (values 0x00-0x7F).
664  */
665 static void acpi_bus_notify(acpi_handle handle, u32 type, void *data)
666 {
667         struct acpi_device *device = NULL;
668         struct acpi_driver *driver;
669
670         ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Notification %#02x to handle %p\n",
671                           type, handle));
672
673         blocking_notifier_call_chain(&acpi_bus_notify_list,
674                 type, (void *)handle);
675
676         switch (type) {
677
678         case ACPI_NOTIFY_BUS_CHECK:
679                 acpi_bus_check_scope(handle);
680                 /*
681                  * TBD: We'll need to outsource certain events to non-ACPI
682                  *      drivers via the device manager (device.c).
683                  */
684                 break;
685
686         case ACPI_NOTIFY_DEVICE_CHECK:
687                 acpi_bus_check_device(handle);
688                 /*
689                  * TBD: We'll need to outsource certain events to non-ACPI
690                  *      drivers via the device manager (device.c).
691                  */
692                 break;
693
694         case ACPI_NOTIFY_DEVICE_WAKE:
695                 /* TBD */
696                 break;
697
698         case ACPI_NOTIFY_EJECT_REQUEST:
699                 /* TBD */
700                 break;
701
702         case ACPI_NOTIFY_DEVICE_CHECK_LIGHT:
703                 /* TBD: Exactly what does 'light' mean? */
704                 break;
705
706         case ACPI_NOTIFY_FREQUENCY_MISMATCH:
707                 /* TBD */
708                 break;
709
710         case ACPI_NOTIFY_BUS_MODE_MISMATCH:
711                 /* TBD */
712                 break;
713
714         case ACPI_NOTIFY_POWER_FAULT:
715                 /* TBD */
716                 break;
717
718         default:
719                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
720                                   "Received unknown/unsupported notification [%08x]\n",
721                                   type));
722                 break;
723         }
724
725         acpi_bus_get_device(handle, &device);
726         if (device) {
727                 driver = device->driver;
728                 if (driver && driver->ops.notify &&
729                     (driver->flags & ACPI_DRIVER_ALL_NOTIFY_EVENTS))
730                         driver->ops.notify(device, type);
731         }
732 }
733
734 /* --------------------------------------------------------------------------
735                              Initialization/Cleanup
736    -------------------------------------------------------------------------- */
737
738 static int __init acpi_bus_init_irq(void)
739 {
740         acpi_status status = AE_OK;
741         union acpi_object arg = { ACPI_TYPE_INTEGER };
742         struct acpi_object_list arg_list = { 1, &arg };
743         char *message = NULL;
744
745
746         /*
747          * Let the system know what interrupt model we are using by
748          * evaluating the \_PIC object, if exists.
749          */
750
751         switch (acpi_irq_model) {
752         case ACPI_IRQ_MODEL_PIC:
753                 message = "PIC";
754                 break;
755         case ACPI_IRQ_MODEL_IOAPIC:
756                 message = "IOAPIC";
757                 break;
758         case ACPI_IRQ_MODEL_IOSAPIC:
759                 message = "IOSAPIC";
760                 break;
761         case ACPI_IRQ_MODEL_PLATFORM:
762                 message = "platform specific model";
763                 break;
764         default:
765                 printk(KERN_WARNING PREFIX "Unknown interrupt routing model\n");
766                 return -ENODEV;
767         }
768
769         printk(KERN_INFO PREFIX "Using %s for interrupt routing\n", message);
770
771         arg.integer.value = acpi_irq_model;
772
773         status = acpi_evaluate_object(NULL, "\\_PIC", &arg_list, NULL);
774         if (ACPI_FAILURE(status) && (status != AE_NOT_FOUND)) {
775                 ACPI_EXCEPTION((AE_INFO, status, "Evaluating _PIC"));
776                 return -ENODEV;
777         }
778
779         return 0;
780 }
781
782 u8 acpi_gbl_permanent_mmap;
783
784
785 void __init acpi_early_init(void)
786 {
787         acpi_status status = AE_OK;
788
789         if (acpi_disabled)
790                 return;
791
792         printk(KERN_INFO PREFIX "Core revision %08x\n", ACPI_CA_VERSION);
793
794         /* enable workarounds, unless strict ACPI spec. compliance */
795         if (!acpi_strict)
796                 acpi_gbl_enable_interpreter_slack = TRUE;
797
798         acpi_gbl_permanent_mmap = 1;
799
800         status = acpi_reallocate_root_table();
801         if (ACPI_FAILURE(status)) {
802                 printk(KERN_ERR PREFIX
803                        "Unable to reallocate ACPI tables\n");
804                 goto error0;
805         }
806
807         status = acpi_initialize_subsystem();
808         if (ACPI_FAILURE(status)) {
809                 printk(KERN_ERR PREFIX
810                        "Unable to initialize the ACPI Interpreter\n");
811                 goto error0;
812         }
813
814         status = acpi_load_tables();
815         if (ACPI_FAILURE(status)) {
816                 printk(KERN_ERR PREFIX
817                        "Unable to load the System Description Tables\n");
818                 goto error0;
819         }
820
821 #ifdef CONFIG_X86
822         if (!acpi_ioapic) {
823                 /* compatible (0) means level (3) */
824                 if (!(acpi_sci_flags & ACPI_MADT_TRIGGER_MASK)) {
825                         acpi_sci_flags &= ~ACPI_MADT_TRIGGER_MASK;
826                         acpi_sci_flags |= ACPI_MADT_TRIGGER_LEVEL;
827                 }
828                 /* Set PIC-mode SCI trigger type */
829                 acpi_pic_sci_set_trigger(acpi_gbl_FADT.sci_interrupt,
830                                          (acpi_sci_flags & ACPI_MADT_TRIGGER_MASK) >> 2);
831         } else {
832                 /*
833                  * now that acpi_gbl_FADT is initialized,
834                  * update it with result from INT_SRC_OVR parsing
835                  */
836                 acpi_gbl_FADT.sci_interrupt = acpi_sci_override_gsi;
837         }
838 #endif
839
840         status =
841             acpi_enable_subsystem(~
842                                   (ACPI_NO_HARDWARE_INIT |
843                                    ACPI_NO_ACPI_ENABLE));
844         if (ACPI_FAILURE(status)) {
845                 printk(KERN_ERR PREFIX "Unable to enable ACPI\n");
846                 goto error0;
847         }
848
849         return;
850
851       error0:
852         disable_acpi();
853         return;
854 }
855
856 static int __init acpi_bus_init(void)
857 {
858         int result = 0;
859         acpi_status status = AE_OK;
860         extern acpi_status acpi_os_initialize1(void);
861
862         acpi_os_initialize1();
863
864         status =
865             acpi_enable_subsystem(ACPI_NO_HARDWARE_INIT | ACPI_NO_ACPI_ENABLE);
866         if (ACPI_FAILURE(status)) {
867                 printk(KERN_ERR PREFIX
868                        "Unable to start the ACPI Interpreter\n");
869                 goto error1;
870         }
871
872         /*
873          * ACPI 2.0 requires the EC driver to be loaded and work before
874          * the EC device is found in the namespace (i.e. before acpi_initialize_objects()
875          * is called).
876          *
877          * This is accomplished by looking for the ECDT table, and getting
878          * the EC parameters out of that.
879          */
880         status = acpi_ec_ecdt_probe();
881         /* Ignore result. Not having an ECDT is not fatal. */
882
883         acpi_bus_osc_support();
884
885         status = acpi_initialize_objects(ACPI_FULL_INITIALIZATION);
886         if (ACPI_FAILURE(status)) {
887                 printk(KERN_ERR PREFIX "Unable to initialize ACPI objects\n");
888                 goto error1;
889         }
890
891         acpi_early_processor_set_pdc();
892
893         /*
894          * Maybe EC region is required at bus_scan/acpi_get_devices. So it
895          * is necessary to enable it as early as possible.
896          */
897         acpi_boot_ec_enable();
898
899         printk(KERN_INFO PREFIX "Interpreter enabled\n");
900
901         /* Initialize sleep structures */
902         acpi_sleep_init();
903
904         /*
905          * Get the system interrupt model and evaluate \_PIC.
906          */
907         result = acpi_bus_init_irq();
908         if (result)
909                 goto error1;
910
911         /*
912          * Register the for all standard device notifications.
913          */
914         status =
915             acpi_install_notify_handler(ACPI_ROOT_OBJECT, ACPI_SYSTEM_NOTIFY,
916                                         &acpi_bus_notify, NULL);
917         if (ACPI_FAILURE(status)) {
918                 printk(KERN_ERR PREFIX
919                        "Unable to register for device notifications\n");
920                 goto error1;
921         }
922
923         /*
924          * Create the top ACPI proc directory
925          */
926         acpi_root_dir = proc_mkdir(ACPI_BUS_FILE_ROOT, NULL);
927
928         return 0;
929
930         /* Mimic structured exception handling */
931       error1:
932         acpi_terminate();
933         return -ENODEV;
934 }
935
936 struct kobject *acpi_kobj;
937
938 static int __init acpi_init(void)
939 {
940         int result = 0;
941
942
943         if (acpi_disabled) {
944                 printk(KERN_INFO PREFIX "Interpreter disabled.\n");
945                 return -ENODEV;
946         }
947
948         acpi_kobj = kobject_create_and_add("acpi", firmware_kobj);
949         if (!acpi_kobj) {
950                 printk(KERN_WARNING "%s: kset create error\n", __func__);
951                 acpi_kobj = NULL;
952         }
953
954         init_acpi_device_notify();
955         result = acpi_bus_init();
956
957         if (!result) {
958                 pci_mmcfg_late_init();
959                 if (!(pm_flags & PM_APM))
960                         pm_flags |= PM_ACPI;
961                 else {
962                         printk(KERN_INFO PREFIX
963                                "APM is already active, exiting\n");
964                         disable_acpi();
965                         result = -ENODEV;
966                 }
967         } else
968                 disable_acpi();
969
970         if (acpi_disabled)
971                 return result;
972
973         /*
974          * If the laptop falls into the DMI check table, the power state check
975          * will be disabled in the course of device power transistion.
976          */
977         dmi_check_system(power_nocheck_dmi_table);
978
979         acpi_scan_init();
980         acpi_ec_init();
981         acpi_power_init();
982         acpi_system_init();
983         acpi_debug_init();
984         acpi_sleep_proc_init();
985         acpi_wakeup_device_init();
986         return result;
987 }
988
989 subsys_initcall(acpi_init);