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