Merge git://git.kernel.org/pub/scm/linux/kernel/git/brodo/pcmcia-fixes-2.6
[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 #define _COMPONENT              ACPI_BUS_COMPONENT
43 ACPI_MODULE_NAME("bus");
44
45 struct acpi_device *acpi_root;
46 struct proc_dir_entry *acpi_root_dir;
47 EXPORT_SYMBOL(acpi_root_dir);
48
49 #define STRUCT_TO_INT(s)        (*((int*)&s))
50
51 /* --------------------------------------------------------------------------
52                                 Device Management
53    -------------------------------------------------------------------------- */
54
55 int acpi_bus_get_device(acpi_handle handle, struct acpi_device **device)
56 {
57         acpi_status status = AE_OK;
58
59
60         if (!device)
61                 return -EINVAL;
62
63         /* TBD: Support fixed-feature devices */
64
65         status = acpi_get_data(handle, acpi_bus_data_handler, (void **)device);
66         if (ACPI_FAILURE(status) || !*device) {
67                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "No context for object [%p]\n",
68                                   handle));
69                 return -ENODEV;
70         }
71
72         return 0;
73 }
74
75 EXPORT_SYMBOL(acpi_bus_get_device);
76
77 int acpi_bus_get_status(struct acpi_device *device)
78 {
79         acpi_status status = AE_OK;
80         unsigned long sta = 0;
81
82
83         if (!device)
84                 return -EINVAL;
85
86         /*
87          * Evaluate _STA if present.
88          */
89         if (device->flags.dynamic_status) {
90                 status =
91                     acpi_evaluate_integer(device->handle, "_STA", NULL, &sta);
92                 if (ACPI_FAILURE(status))
93                         return -ENODEV;
94                 STRUCT_TO_INT(device->status) = (int)sta;
95         }
96
97         /*
98          * Otherwise we assume the status of our parent (unless we don't
99          * have one, in which case status is implied).
100          */
101         else if (device->parent)
102                 device->status = device->parent->status;
103         else
104                 STRUCT_TO_INT(device->status) =
105                     ACPI_STA_DEVICE_PRESENT | ACPI_STA_DEVICE_ENABLED |
106                     ACPI_STA_DEVICE_UI      | ACPI_STA_DEVICE_FUNCTIONING;
107
108         if (device->status.functional && !device->status.present) {
109                 printk(KERN_WARNING PREFIX "Device [%s] status [%08x]: "
110                        "functional but not present; setting present\n",
111                        device->pnp.bus_id, (u32) STRUCT_TO_INT(device->status));
112                 device->status.present = 1;
113         }
114
115         ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Device [%s] status [%08x]\n",
116                           device->pnp.bus_id,
117                           (u32) STRUCT_TO_INT(device->status)));
118
119         return 0;
120 }
121
122 EXPORT_SYMBOL(acpi_bus_get_status);
123
124 void acpi_bus_private_data_handler(acpi_handle handle,
125                                    u32 function, void *context)
126 {
127         return;
128 }
129 EXPORT_SYMBOL(acpi_bus_private_data_handler);
130
131 int acpi_bus_get_private_data(acpi_handle handle, void **data)
132 {
133         acpi_status status = AE_OK;
134
135         if (!*data)
136                 return -EINVAL;
137
138         status = acpi_get_data(handle, acpi_bus_private_data_handler, data);
139         if (ACPI_FAILURE(status) || !*data) {
140                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "No context for object [%p]\n",
141                                 handle));
142                 return -ENODEV;
143         }
144
145         return 0;
146 }
147 EXPORT_SYMBOL(acpi_bus_get_private_data);
148
149 /* --------------------------------------------------------------------------
150                                  Power Management
151    -------------------------------------------------------------------------- */
152
153 int acpi_bus_get_power(acpi_handle handle, int *state)
154 {
155         int result = 0;
156         acpi_status status = 0;
157         struct acpi_device *device = NULL;
158         unsigned long psc = 0;
159
160
161         result = acpi_bus_get_device(handle, &device);
162         if (result)
163                 return result;
164
165         *state = ACPI_STATE_UNKNOWN;
166
167         if (!device->flags.power_manageable) {
168                 /* TBD: Non-recursive algorithm for walking up hierarchy */
169                 if (device->parent)
170                         *state = device->parent->power.state;
171                 else
172                         *state = ACPI_STATE_D0;
173         } else {
174                 /*
175                  * Get the device's power state either directly (via _PSC) or
176                  * indirectly (via power resources).
177                  */
178                 if (device->power.flags.explicit_get) {
179                         status = acpi_evaluate_integer(device->handle, "_PSC",
180                                                        NULL, &psc);
181                         if (ACPI_FAILURE(status))
182                                 return -ENODEV;
183                         device->power.state = (int)psc;
184                 } else if (device->power.flags.power_resources) {
185                         result = acpi_power_get_inferred_state(device);
186                         if (result)
187                                 return result;
188                 }
189
190                 *state = device->power.state;
191         }
192
193         ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Device [%s] power state is D%d\n",
194                           device->pnp.bus_id, device->power.state));
195
196         return 0;
197 }
198
199 EXPORT_SYMBOL(acpi_bus_get_power);
200
201 int acpi_bus_set_power(acpi_handle handle, int state)
202 {
203         int result = 0;
204         acpi_status status = AE_OK;
205         struct acpi_device *device = NULL;
206         char object_name[5] = { '_', 'P', 'S', '0' + state, '\0' };
207
208
209         result = acpi_bus_get_device(handle, &device);
210         if (result)
211                 return result;
212
213         if ((state < ACPI_STATE_D0) || (state > ACPI_STATE_D3))
214                 return -EINVAL;
215
216         /* Make sure this is a valid target state */
217
218         if (!device->flags.power_manageable) {
219                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Device `[%s]' is not power manageable\n",
220                                 kobject_name(&device->dev.kobj)));
221                 return -ENODEV;
222         }
223         /*
224          * Get device's current power state
225          */
226         acpi_bus_get_power(device->handle, &device->power.state);
227         if ((state == device->power.state) && !device->flags.force_power_state) {
228                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Device is already at D%d\n",
229                                   state));
230                 return 0;
231         }
232
233         if (!device->power.states[state].flags.valid) {
234                 printk(KERN_WARNING PREFIX "Device does not support D%d\n", state);
235                 return -ENODEV;
236         }
237         if (device->parent && (state < device->parent->power.state)) {
238                 printk(KERN_WARNING PREFIX
239                               "Cannot set device to a higher-powered"
240                               " state than parent\n");
241                 return -ENODEV;
242         }
243
244         /*
245          * Transition Power
246          * ----------------
247          * On transitions to a high-powered state we first apply power (via
248          * power resources) then evalute _PSx.  Conversly for transitions to
249          * a lower-powered state.
250          */
251         if (state < device->power.state) {
252                 if (device->power.flags.power_resources) {
253                         result = acpi_power_transition(device, state);
254                         if (result)
255                                 goto end;
256                 }
257                 if (device->power.states[state].flags.explicit_set) {
258                         status = acpi_evaluate_object(device->handle,
259                                                       object_name, NULL, NULL);
260                         if (ACPI_FAILURE(status)) {
261                                 result = -ENODEV;
262                                 goto end;
263                         }
264                 }
265         } else {
266                 if (device->power.states[state].flags.explicit_set) {
267                         status = acpi_evaluate_object(device->handle,
268                                                       object_name, NULL, NULL);
269                         if (ACPI_FAILURE(status)) {
270                                 result = -ENODEV;
271                                 goto end;
272                         }
273                 }
274                 if (device->power.flags.power_resources) {
275                         result = acpi_power_transition(device, state);
276                         if (result)
277                                 goto end;
278                 }
279         }
280
281       end:
282         if (result)
283                 printk(KERN_WARNING PREFIX
284                               "Transitioning device [%s] to D%d\n",
285                               device->pnp.bus_id, state);
286         else {
287                 device->power.state = state;
288                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
289                                   "Device [%s] transitioned to D%d\n",
290                                   device->pnp.bus_id, state));
291         }
292
293         return result;
294 }
295
296 EXPORT_SYMBOL(acpi_bus_set_power);
297
298 bool acpi_bus_power_manageable(acpi_handle handle)
299 {
300         struct acpi_device *device;
301         int result;
302
303         result = acpi_bus_get_device(handle, &device);
304         return result ? false : device->flags.power_manageable;
305 }
306
307 EXPORT_SYMBOL(acpi_bus_power_manageable);
308
309 bool acpi_bus_can_wakeup(acpi_handle handle)
310 {
311         struct acpi_device *device;
312         int result;
313
314         result = acpi_bus_get_device(handle, &device);
315         return result ? false : device->wakeup.flags.valid;
316 }
317
318 EXPORT_SYMBOL(acpi_bus_can_wakeup);
319
320 /* --------------------------------------------------------------------------
321                                 Event Management
322    -------------------------------------------------------------------------- */
323
324 #ifdef CONFIG_ACPI_PROC_EVENT
325 static DEFINE_SPINLOCK(acpi_bus_event_lock);
326
327 LIST_HEAD(acpi_bus_event_list);
328 DECLARE_WAIT_QUEUE_HEAD(acpi_bus_event_queue);
329
330 extern int event_is_open;
331
332 int acpi_bus_generate_proc_event4(const char *device_class, const char *bus_id, u8 type, int data)
333 {
334         struct acpi_bus_event *event;
335         unsigned long flags = 0;
336
337         /* drop event on the floor if no one's listening */
338         if (!event_is_open)
339                 return 0;
340
341         event = kmalloc(sizeof(struct acpi_bus_event), GFP_ATOMIC);
342         if (!event)
343                 return -ENOMEM;
344
345         strcpy(event->device_class, device_class);
346         strcpy(event->bus_id, bus_id);
347         event->type = type;
348         event->data = data;
349
350         spin_lock_irqsave(&acpi_bus_event_lock, flags);
351         list_add_tail(&event->node, &acpi_bus_event_list);
352         spin_unlock_irqrestore(&acpi_bus_event_lock, flags);
353
354         wake_up_interruptible(&acpi_bus_event_queue);
355
356         return 0;
357
358 }
359
360 EXPORT_SYMBOL_GPL(acpi_bus_generate_proc_event4);
361
362 int acpi_bus_generate_proc_event(struct acpi_device *device, u8 type, int data)
363 {
364         if (!device)
365                 return -EINVAL;
366         return acpi_bus_generate_proc_event4(device->pnp.device_class,
367                                              device->pnp.bus_id, type, data);
368 }
369
370 EXPORT_SYMBOL(acpi_bus_generate_proc_event);
371
372 int acpi_bus_receive_event(struct acpi_bus_event *event)
373 {
374         unsigned long flags = 0;
375         struct acpi_bus_event *entry = NULL;
376
377         DECLARE_WAITQUEUE(wait, current);
378
379
380         if (!event)
381                 return -EINVAL;
382
383         if (list_empty(&acpi_bus_event_list)) {
384
385                 set_current_state(TASK_INTERRUPTIBLE);
386                 add_wait_queue(&acpi_bus_event_queue, &wait);
387
388                 if (list_empty(&acpi_bus_event_list))
389                         schedule();
390
391                 remove_wait_queue(&acpi_bus_event_queue, &wait);
392                 set_current_state(TASK_RUNNING);
393
394                 if (signal_pending(current))
395                         return -ERESTARTSYS;
396         }
397
398         spin_lock_irqsave(&acpi_bus_event_lock, flags);
399         if (!list_empty(&acpi_bus_event_list)) {
400                 entry = list_entry(acpi_bus_event_list.next,
401                                    struct acpi_bus_event, node);
402                 list_del(&entry->node);
403         }
404         spin_unlock_irqrestore(&acpi_bus_event_lock, flags);
405
406         if (!entry)
407                 return -ENODEV;
408
409         memcpy(event, entry, sizeof(struct acpi_bus_event));
410
411         kfree(entry);
412
413         return 0;
414 }
415
416 #endif  /* CONFIG_ACPI_PROC_EVENT */
417
418 /* --------------------------------------------------------------------------
419                              Notification Handling
420    -------------------------------------------------------------------------- */
421
422 static int
423 acpi_bus_check_device(struct acpi_device *device, int *status_changed)
424 {
425         acpi_status status = 0;
426         struct acpi_device_status old_status;
427
428
429         if (!device)
430                 return -EINVAL;
431
432         if (status_changed)
433                 *status_changed = 0;
434
435         old_status = device->status;
436
437         /*
438          * Make sure this device's parent is present before we go about
439          * messing with the device.
440          */
441         if (device->parent && !device->parent->status.present) {
442                 device->status = device->parent->status;
443                 if (STRUCT_TO_INT(old_status) != STRUCT_TO_INT(device->status)) {
444                         if (status_changed)
445                                 *status_changed = 1;
446                 }
447                 return 0;
448         }
449
450         status = acpi_bus_get_status(device);
451         if (ACPI_FAILURE(status))
452                 return -ENODEV;
453
454         if (STRUCT_TO_INT(old_status) == STRUCT_TO_INT(device->status))
455                 return 0;
456
457         if (status_changed)
458                 *status_changed = 1;
459
460         /*
461          * Device Insertion/Removal
462          */
463         if ((device->status.present) && !(old_status.present)) {
464                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Device insertion detected\n"));
465                 /* TBD: Handle device insertion */
466         } else if (!(device->status.present) && (old_status.present)) {
467                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Device removal detected\n"));
468                 /* TBD: Handle device removal */
469         }
470
471         return 0;
472 }
473
474 static int acpi_bus_check_scope(struct acpi_device *device)
475 {
476         int result = 0;
477         int status_changed = 0;
478
479
480         if (!device)
481                 return -EINVAL;
482
483         /* Status Change? */
484         result = acpi_bus_check_device(device, &status_changed);
485         if (result)
486                 return result;
487
488         if (!status_changed)
489                 return 0;
490
491         /*
492          * TBD: Enumerate child devices within this device's scope and
493          *       run acpi_bus_check_device()'s on them.
494          */
495
496         return 0;
497 }
498
499 /**
500  * acpi_bus_notify
501  * ---------------
502  * Callback for all 'system-level' device notifications (values 0x00-0x7F).
503  */
504 static void acpi_bus_notify(acpi_handle handle, u32 type, void *data)
505 {
506         int result = 0;
507         struct acpi_device *device = NULL;
508
509
510         if (acpi_bus_get_device(handle, &device))
511                 return;
512
513         switch (type) {
514
515         case ACPI_NOTIFY_BUS_CHECK:
516                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
517                                   "Received BUS CHECK notification for device [%s]\n",
518                                   device->pnp.bus_id));
519                 result = acpi_bus_check_scope(device);
520                 /*
521                  * TBD: We'll need to outsource certain events to non-ACPI
522                  *      drivers via the device manager (device.c).
523                  */
524                 break;
525
526         case ACPI_NOTIFY_DEVICE_CHECK:
527                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
528                                   "Received DEVICE CHECK notification for device [%s]\n",
529                                   device->pnp.bus_id));
530                 result = acpi_bus_check_device(device, NULL);
531                 /*
532                  * TBD: We'll need to outsource certain events to non-ACPI
533                  *      drivers via the device manager (device.c).
534                  */
535                 break;
536
537         case ACPI_NOTIFY_DEVICE_WAKE:
538                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
539                                   "Received DEVICE WAKE notification for device [%s]\n",
540                                   device->pnp.bus_id));
541                 /* TBD */
542                 break;
543
544         case ACPI_NOTIFY_EJECT_REQUEST:
545                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
546                                   "Received EJECT REQUEST notification for device [%s]\n",
547                                   device->pnp.bus_id));
548                 /* TBD */
549                 break;
550
551         case ACPI_NOTIFY_DEVICE_CHECK_LIGHT:
552                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
553                                   "Received DEVICE CHECK LIGHT notification for device [%s]\n",
554                                   device->pnp.bus_id));
555                 /* TBD: Exactly what does 'light' mean? */
556                 break;
557
558         case ACPI_NOTIFY_FREQUENCY_MISMATCH:
559                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
560                                   "Received FREQUENCY MISMATCH notification for device [%s]\n",
561                                   device->pnp.bus_id));
562                 /* TBD */
563                 break;
564
565         case ACPI_NOTIFY_BUS_MODE_MISMATCH:
566                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
567                                   "Received BUS MODE MISMATCH notification for device [%s]\n",
568                                   device->pnp.bus_id));
569                 /* TBD */
570                 break;
571
572         case ACPI_NOTIFY_POWER_FAULT:
573                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
574                                   "Received POWER FAULT notification for device [%s]\n",
575                                   device->pnp.bus_id));
576                 /* TBD */
577                 break;
578
579         default:
580                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
581                                   "Received unknown/unsupported notification [%08x]\n",
582                                   type));
583                 break;
584         }
585
586         return;
587 }
588
589 /* --------------------------------------------------------------------------
590                              Initialization/Cleanup
591    -------------------------------------------------------------------------- */
592
593 static int __init acpi_bus_init_irq(void)
594 {
595         acpi_status status = AE_OK;
596         union acpi_object arg = { ACPI_TYPE_INTEGER };
597         struct acpi_object_list arg_list = { 1, &arg };
598         char *message = NULL;
599
600
601         /*
602          * Let the system know what interrupt model we are using by
603          * evaluating the \_PIC object, if exists.
604          */
605
606         switch (acpi_irq_model) {
607         case ACPI_IRQ_MODEL_PIC:
608                 message = "PIC";
609                 break;
610         case ACPI_IRQ_MODEL_IOAPIC:
611                 message = "IOAPIC";
612                 break;
613         case ACPI_IRQ_MODEL_IOSAPIC:
614                 message = "IOSAPIC";
615                 break;
616         case ACPI_IRQ_MODEL_PLATFORM:
617                 message = "platform specific model";
618                 break;
619         default:
620                 printk(KERN_WARNING PREFIX "Unknown interrupt routing model\n");
621                 return -ENODEV;
622         }
623
624         printk(KERN_INFO PREFIX "Using %s for interrupt routing\n", message);
625
626         arg.integer.value = acpi_irq_model;
627
628         status = acpi_evaluate_object(NULL, "\\_PIC", &arg_list, NULL);
629         if (ACPI_FAILURE(status) && (status != AE_NOT_FOUND)) {
630                 ACPI_EXCEPTION((AE_INFO, status, "Evaluating _PIC"));
631                 return -ENODEV;
632         }
633
634         return 0;
635 }
636
637 u8 acpi_gbl_permanent_mmap;
638
639
640 void __init acpi_early_init(void)
641 {
642         acpi_status status = AE_OK;
643
644         if (acpi_disabled)
645                 return;
646
647         printk(KERN_INFO PREFIX "Core revision %08x\n", ACPI_CA_VERSION);
648
649         /* enable workarounds, unless strict ACPI spec. compliance */
650         if (!acpi_strict)
651                 acpi_gbl_enable_interpreter_slack = TRUE;
652
653         acpi_gbl_permanent_mmap = 1;
654
655         status = acpi_reallocate_root_table();
656         if (ACPI_FAILURE(status)) {
657                 printk(KERN_ERR PREFIX
658                        "Unable to reallocate ACPI tables\n");
659                 goto error0;
660         }
661
662         status = acpi_initialize_subsystem();
663         if (ACPI_FAILURE(status)) {
664                 printk(KERN_ERR PREFIX
665                        "Unable to initialize the ACPI Interpreter\n");
666                 goto error0;
667         }
668
669         status = acpi_load_tables();
670         if (ACPI_FAILURE(status)) {
671                 printk(KERN_ERR PREFIX
672                        "Unable to load the System Description Tables\n");
673                 goto error0;
674         }
675
676 #ifdef CONFIG_X86
677         if (!acpi_ioapic) {
678                 /* compatible (0) means level (3) */
679                 if (!(acpi_sci_flags & ACPI_MADT_TRIGGER_MASK)) {
680                         acpi_sci_flags &= ~ACPI_MADT_TRIGGER_MASK;
681                         acpi_sci_flags |= ACPI_MADT_TRIGGER_LEVEL;
682                 }
683                 /* Set PIC-mode SCI trigger type */
684                 acpi_pic_sci_set_trigger(acpi_gbl_FADT.sci_interrupt,
685                                          (acpi_sci_flags & ACPI_MADT_TRIGGER_MASK) >> 2);
686         } else {
687                 /*
688                  * now that acpi_gbl_FADT is initialized,
689                  * update it with result from INT_SRC_OVR parsing
690                  */
691                 acpi_gbl_FADT.sci_interrupt = acpi_sci_override_gsi;
692         }
693 #endif
694
695         status =
696             acpi_enable_subsystem(~
697                                   (ACPI_NO_HARDWARE_INIT |
698                                    ACPI_NO_ACPI_ENABLE));
699         if (ACPI_FAILURE(status)) {
700                 printk(KERN_ERR PREFIX "Unable to enable ACPI\n");
701                 goto error0;
702         }
703
704         return;
705
706       error0:
707         disable_acpi();
708         return;
709 }
710
711 static int __init acpi_bus_init(void)
712 {
713         int result = 0;
714         acpi_status status = AE_OK;
715         extern acpi_status acpi_os_initialize1(void);
716
717
718         status = acpi_os_initialize1();
719
720         status =
721             acpi_enable_subsystem(ACPI_NO_HARDWARE_INIT | ACPI_NO_ACPI_ENABLE);
722         if (ACPI_FAILURE(status)) {
723                 printk(KERN_ERR PREFIX
724                        "Unable to start the ACPI Interpreter\n");
725                 goto error1;
726         }
727
728         if (ACPI_FAILURE(status)) {
729                 printk(KERN_ERR PREFIX
730                        "Unable to initialize ACPI OS objects\n");
731                 goto error1;
732         }
733 #ifdef CONFIG_ACPI_EC
734         /*
735          * ACPI 2.0 requires the EC driver to be loaded and work before
736          * the EC device is found in the namespace (i.e. before acpi_initialize_objects()
737          * is called).
738          *
739          * This is accomplished by looking for the ECDT table, and getting
740          * the EC parameters out of that.
741          */
742         status = acpi_ec_ecdt_probe();
743         /* Ignore result. Not having an ECDT is not fatal. */
744 #endif
745
746         status = acpi_initialize_objects(ACPI_FULL_INITIALIZATION);
747         if (ACPI_FAILURE(status)) {
748                 printk(KERN_ERR PREFIX "Unable to initialize ACPI objects\n");
749                 goto error1;
750         }
751
752         printk(KERN_INFO PREFIX "Interpreter enabled\n");
753
754         /* Initialize sleep structures */
755         acpi_sleep_init();
756
757         /*
758          * Get the system interrupt model and evaluate \_PIC.
759          */
760         result = acpi_bus_init_irq();
761         if (result)
762                 goto error1;
763
764         /*
765          * Register the for all standard device notifications.
766          */
767         status =
768             acpi_install_notify_handler(ACPI_ROOT_OBJECT, ACPI_SYSTEM_NOTIFY,
769                                         &acpi_bus_notify, NULL);
770         if (ACPI_FAILURE(status)) {
771                 printk(KERN_ERR PREFIX
772                        "Unable to register for device notifications\n");
773                 goto error1;
774         }
775
776         /*
777          * Create the top ACPI proc directory
778          */
779         acpi_root_dir = proc_mkdir(ACPI_BUS_FILE_ROOT, NULL);
780
781         return 0;
782
783         /* Mimic structured exception handling */
784       error1:
785         acpi_terminate();
786         return -ENODEV;
787 }
788
789 struct kobject *acpi_kobj;
790
791 static int __init acpi_init(void)
792 {
793         int result = 0;
794
795
796         if (acpi_disabled) {
797                 printk(KERN_INFO PREFIX "Interpreter disabled.\n");
798                 return -ENODEV;
799         }
800
801         acpi_kobj = kobject_create_and_add("acpi", firmware_kobj);
802         if (!acpi_kobj) {
803                 printk(KERN_WARNING "%s: kset create error\n", __func__);
804                 acpi_kobj = NULL;
805         }
806
807         result = acpi_bus_init();
808
809         if (!result) {
810                 pci_mmcfg_late_init();
811                 if (!(pm_flags & PM_APM))
812                         pm_flags |= PM_ACPI;
813                 else {
814                         printk(KERN_INFO PREFIX
815                                "APM is already active, exiting\n");
816                         disable_acpi();
817                         result = -ENODEV;
818                 }
819         } else
820                 disable_acpi();
821
822         return result;
823 }
824
825 subsys_initcall(acpi_init);