ACPI : Load device driver according to the status of acpi device
[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
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 static int set_power_nocheck(const struct dmi_system_id *id)
52 {
53         printk(KERN_NOTICE PREFIX "%s detected - "
54                 "disable power check in power transistion\n", id->ident);
55         acpi_power_nocheck = 1;
56         return 0;
57 }
58 static struct dmi_system_id __cpuinitdata power_nocheck_dmi_table[] = {
59         {
60         set_power_nocheck, "HP Pavilion 05", {
61         DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies LTD"),
62         DMI_MATCH(DMI_SYS_VENDOR, "HP Pavilion 05"),
63         DMI_MATCH(DMI_PRODUCT_VERSION, "2001211RE101GLEND") }, NULL},
64         {},
65 };
66
67
68 /* --------------------------------------------------------------------------
69                                 Device Management
70    -------------------------------------------------------------------------- */
71
72 int acpi_bus_get_device(acpi_handle handle, struct acpi_device **device)
73 {
74         acpi_status status = AE_OK;
75
76
77         if (!device)
78                 return -EINVAL;
79
80         /* TBD: Support fixed-feature devices */
81
82         status = acpi_get_data(handle, acpi_bus_data_handler, (void **)device);
83         if (ACPI_FAILURE(status) || !*device) {
84                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "No context for object [%p]\n",
85                                   handle));
86                 return -ENODEV;
87         }
88
89         return 0;
90 }
91
92 EXPORT_SYMBOL(acpi_bus_get_device);
93
94 int acpi_bus_get_status(struct acpi_device *device)
95 {
96         acpi_status status = AE_OK;
97         unsigned long sta = 0;
98
99
100         if (!device)
101                 return -EINVAL;
102
103         /*
104          * Evaluate _STA if present.
105          */
106         if (device->flags.dynamic_status) {
107                 status =
108                     acpi_evaluate_integer(device->handle, "_STA", NULL, &sta);
109                 if (ACPI_FAILURE(status))
110                         return -ENODEV;
111                 STRUCT_TO_INT(device->status) = (int)sta;
112         }
113
114         /*
115          * According to ACPI spec some device can be present and functional
116          * even if the parent is not present but functional.
117          * In such conditions the child device should not inherit the status
118          * from the parent.
119          */
120         else
121                 STRUCT_TO_INT(device->status) =
122                     ACPI_STA_DEVICE_PRESENT | ACPI_STA_DEVICE_ENABLED |
123                     ACPI_STA_DEVICE_UI      | ACPI_STA_DEVICE_FUNCTIONING;
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
136         return 0;
137 }
138
139 EXPORT_SYMBOL(acpi_bus_get_status);
140
141 void acpi_bus_private_data_handler(acpi_handle handle,
142                                    u32 function, void *context)
143 {
144         return;
145 }
146 EXPORT_SYMBOL(acpi_bus_private_data_handler);
147
148 int acpi_bus_get_private_data(acpi_handle handle, void **data)
149 {
150         acpi_status status = AE_OK;
151
152         if (!*data)
153                 return -EINVAL;
154
155         status = acpi_get_data(handle, acpi_bus_private_data_handler, data);
156         if (ACPI_FAILURE(status) || !*data) {
157                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "No context for object [%p]\n",
158                                 handle));
159                 return -ENODEV;
160         }
161
162         return 0;
163 }
164 EXPORT_SYMBOL(acpi_bus_get_private_data);
165
166 /* --------------------------------------------------------------------------
167                                  Power Management
168    -------------------------------------------------------------------------- */
169
170 int acpi_bus_get_power(acpi_handle handle, int *state)
171 {
172         int result = 0;
173         acpi_status status = 0;
174         struct acpi_device *device = NULL;
175         unsigned long psc = 0;
176
177
178         result = acpi_bus_get_device(handle, &device);
179         if (result)
180                 return result;
181
182         *state = ACPI_STATE_UNKNOWN;
183
184         if (!device->flags.power_manageable) {
185                 /* TBD: Non-recursive algorithm for walking up hierarchy */
186                 if (device->parent)
187                         *state = device->parent->power.state;
188                 else
189                         *state = ACPI_STATE_D0;
190         } else {
191                 /*
192                  * Get the device's power state either directly (via _PSC) or
193                  * indirectly (via power resources).
194                  */
195                 if (device->power.flags.explicit_get) {
196                         status = acpi_evaluate_integer(device->handle, "_PSC",
197                                                        NULL, &psc);
198                         if (ACPI_FAILURE(status))
199                                 return -ENODEV;
200                         device->power.state = (int)psc;
201                 } else if (device->power.flags.power_resources) {
202                         result = acpi_power_get_inferred_state(device);
203                         if (result)
204                                 return result;
205                 }
206
207                 *state = device->power.state;
208         }
209
210         ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Device [%s] power state is D%d\n",
211                           device->pnp.bus_id, device->power.state));
212
213         return 0;
214 }
215
216 EXPORT_SYMBOL(acpi_bus_get_power);
217
218 int acpi_bus_set_power(acpi_handle handle, int state)
219 {
220         int result = 0;
221         acpi_status status = AE_OK;
222         struct acpi_device *device = NULL;
223         char object_name[5] = { '_', 'P', 'S', '0' + state, '\0' };
224
225
226         result = acpi_bus_get_device(handle, &device);
227         if (result)
228                 return result;
229
230         if ((state < ACPI_STATE_D0) || (state > ACPI_STATE_D3))
231                 return -EINVAL;
232
233         /* Make sure this is a valid target state */
234
235         if (!device->flags.power_manageable) {
236                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Device `[%s]' is not power manageable\n",
237                                 kobject_name(&device->dev.kobj)));
238                 return -ENODEV;
239         }
240         /*
241          * Get device's current power state
242          */
243         if (!acpi_power_nocheck) {
244                 /*
245                  * Maybe the incorrect power state is returned on the bogus
246                  * bios, which is different with the real power state.
247                  * For example: the bios returns D0 state and the real power
248                  * state is D3. OS expects to set the device to D0 state. In
249                  * such case if OS uses the power state returned by the BIOS,
250                  * the device can't be transisted to the correct power state.
251                  * So if the acpi_power_nocheck is set, it is unnecessary to
252                  * get the power state by calling acpi_bus_get_power.
253                  */
254                 acpi_bus_get_power(device->handle, &device->power.state);
255         }
256         if ((state == device->power.state) && !device->flags.force_power_state) {
257                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Device is already at D%d\n",
258                                   state));
259                 return 0;
260         }
261
262         if (!device->power.states[state].flags.valid) {
263                 printk(KERN_WARNING PREFIX "Device does not support D%d\n", state);
264                 return -ENODEV;
265         }
266         if (device->parent && (state < device->parent->power.state)) {
267                 printk(KERN_WARNING PREFIX
268                               "Cannot set device to a higher-powered"
269                               " state than parent\n");
270                 return -ENODEV;
271         }
272
273         /*
274          * Transition Power
275          * ----------------
276          * On transitions to a high-powered state we first apply power (via
277          * power resources) then evalute _PSx.  Conversly for transitions to
278          * a lower-powered state.
279          */
280         if (state < device->power.state) {
281                 if (device->power.flags.power_resources) {
282                         result = acpi_power_transition(device, state);
283                         if (result)
284                                 goto end;
285                 }
286                 if (device->power.states[state].flags.explicit_set) {
287                         status = acpi_evaluate_object(device->handle,
288                                                       object_name, NULL, NULL);
289                         if (ACPI_FAILURE(status)) {
290                                 result = -ENODEV;
291                                 goto end;
292                         }
293                 }
294         } else {
295                 if (device->power.states[state].flags.explicit_set) {
296                         status = acpi_evaluate_object(device->handle,
297                                                       object_name, NULL, NULL);
298                         if (ACPI_FAILURE(status)) {
299                                 result = -ENODEV;
300                                 goto end;
301                         }
302                 }
303                 if (device->power.flags.power_resources) {
304                         result = acpi_power_transition(device, state);
305                         if (result)
306                                 goto end;
307                 }
308         }
309
310       end:
311         if (result)
312                 printk(KERN_WARNING PREFIX
313                               "Transitioning device [%s] to D%d\n",
314                               device->pnp.bus_id, state);
315         else {
316                 device->power.state = state;
317                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
318                                   "Device [%s] transitioned to D%d\n",
319                                   device->pnp.bus_id, state));
320         }
321
322         return result;
323 }
324
325 EXPORT_SYMBOL(acpi_bus_set_power);
326
327 bool acpi_bus_power_manageable(acpi_handle handle)
328 {
329         struct acpi_device *device;
330         int result;
331
332         result = acpi_bus_get_device(handle, &device);
333         return result ? false : device->flags.power_manageable;
334 }
335
336 EXPORT_SYMBOL(acpi_bus_power_manageable);
337
338 bool acpi_bus_can_wakeup(acpi_handle handle)
339 {
340         struct acpi_device *device;
341         int result;
342
343         result = acpi_bus_get_device(handle, &device);
344         return result ? false : device->wakeup.flags.valid;
345 }
346
347 EXPORT_SYMBOL(acpi_bus_can_wakeup);
348
349 /* --------------------------------------------------------------------------
350                                 Event Management
351    -------------------------------------------------------------------------- */
352
353 #ifdef CONFIG_ACPI_PROC_EVENT
354 static DEFINE_SPINLOCK(acpi_bus_event_lock);
355
356 LIST_HEAD(acpi_bus_event_list);
357 DECLARE_WAIT_QUEUE_HEAD(acpi_bus_event_queue);
358
359 extern int event_is_open;
360
361 int acpi_bus_generate_proc_event4(const char *device_class, const char *bus_id, u8 type, int data)
362 {
363         struct acpi_bus_event *event;
364         unsigned long flags = 0;
365
366         /* drop event on the floor if no one's listening */
367         if (!event_is_open)
368                 return 0;
369
370         event = kmalloc(sizeof(struct acpi_bus_event), GFP_ATOMIC);
371         if (!event)
372                 return -ENOMEM;
373
374         strcpy(event->device_class, device_class);
375         strcpy(event->bus_id, bus_id);
376         event->type = type;
377         event->data = data;
378
379         spin_lock_irqsave(&acpi_bus_event_lock, flags);
380         list_add_tail(&event->node, &acpi_bus_event_list);
381         spin_unlock_irqrestore(&acpi_bus_event_lock, flags);
382
383         wake_up_interruptible(&acpi_bus_event_queue);
384
385         return 0;
386
387 }
388
389 EXPORT_SYMBOL_GPL(acpi_bus_generate_proc_event4);
390
391 int acpi_bus_generate_proc_event(struct acpi_device *device, u8 type, int data)
392 {
393         if (!device)
394                 return -EINVAL;
395         return acpi_bus_generate_proc_event4(device->pnp.device_class,
396                                              device->pnp.bus_id, type, data);
397 }
398
399 EXPORT_SYMBOL(acpi_bus_generate_proc_event);
400
401 int acpi_bus_receive_event(struct acpi_bus_event *event)
402 {
403         unsigned long flags = 0;
404         struct acpi_bus_event *entry = NULL;
405
406         DECLARE_WAITQUEUE(wait, current);
407
408
409         if (!event)
410                 return -EINVAL;
411
412         if (list_empty(&acpi_bus_event_list)) {
413
414                 set_current_state(TASK_INTERRUPTIBLE);
415                 add_wait_queue(&acpi_bus_event_queue, &wait);
416
417                 if (list_empty(&acpi_bus_event_list))
418                         schedule();
419
420                 remove_wait_queue(&acpi_bus_event_queue, &wait);
421                 set_current_state(TASK_RUNNING);
422
423                 if (signal_pending(current))
424                         return -ERESTARTSYS;
425         }
426
427         spin_lock_irqsave(&acpi_bus_event_lock, flags);
428         if (!list_empty(&acpi_bus_event_list)) {
429                 entry = list_entry(acpi_bus_event_list.next,
430                                    struct acpi_bus_event, node);
431                 list_del(&entry->node);
432         }
433         spin_unlock_irqrestore(&acpi_bus_event_lock, flags);
434
435         if (!entry)
436                 return -ENODEV;
437
438         memcpy(event, entry, sizeof(struct acpi_bus_event));
439
440         kfree(entry);
441
442         return 0;
443 }
444
445 #endif  /* CONFIG_ACPI_PROC_EVENT */
446
447 /* --------------------------------------------------------------------------
448                              Notification Handling
449    -------------------------------------------------------------------------- */
450
451 static int
452 acpi_bus_check_device(struct acpi_device *device, int *status_changed)
453 {
454         acpi_status status = 0;
455         struct acpi_device_status old_status;
456
457
458         if (!device)
459                 return -EINVAL;
460
461         if (status_changed)
462                 *status_changed = 0;
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                 if (STRUCT_TO_INT(old_status) != STRUCT_TO_INT(device->status)) {
473                         if (status_changed)
474                                 *status_changed = 1;
475                 }
476                 return 0;
477         }
478
479         status = acpi_bus_get_status(device);
480         if (ACPI_FAILURE(status))
481                 return -ENODEV;
482
483         if (STRUCT_TO_INT(old_status) == STRUCT_TO_INT(device->status))
484                 return 0;
485
486         if (status_changed)
487                 *status_changed = 1;
488
489         /*
490          * Device Insertion/Removal
491          */
492         if ((device->status.present) && !(old_status.present)) {
493                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Device insertion detected\n"));
494                 /* TBD: Handle device insertion */
495         } else if (!(device->status.present) && (old_status.present)) {
496                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Device removal detected\n"));
497                 /* TBD: Handle device removal */
498         }
499
500         return 0;
501 }
502
503 static int acpi_bus_check_scope(struct acpi_device *device)
504 {
505         int result = 0;
506         int status_changed = 0;
507
508
509         if (!device)
510                 return -EINVAL;
511
512         /* Status Change? */
513         result = acpi_bus_check_device(device, &status_changed);
514         if (result)
515                 return result;
516
517         if (!status_changed)
518                 return 0;
519
520         /*
521          * TBD: Enumerate child devices within this device's scope and
522          *       run acpi_bus_check_device()'s on them.
523          */
524
525         return 0;
526 }
527
528 /**
529  * acpi_bus_notify
530  * ---------------
531  * Callback for all 'system-level' device notifications (values 0x00-0x7F).
532  */
533 static void acpi_bus_notify(acpi_handle handle, u32 type, void *data)
534 {
535         int result = 0;
536         struct acpi_device *device = NULL;
537
538
539         if (acpi_bus_get_device(handle, &device))
540                 return;
541
542         switch (type) {
543
544         case ACPI_NOTIFY_BUS_CHECK:
545                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
546                                   "Received BUS CHECK notification for device [%s]\n",
547                                   device->pnp.bus_id));
548                 result = acpi_bus_check_scope(device);
549                 /*
550                  * TBD: We'll need to outsource certain events to non-ACPI
551                  *      drivers via the device manager (device.c).
552                  */
553                 break;
554
555         case ACPI_NOTIFY_DEVICE_CHECK:
556                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
557                                   "Received DEVICE CHECK notification for device [%s]\n",
558                                   device->pnp.bus_id));
559                 result = acpi_bus_check_device(device, NULL);
560                 /*
561                  * TBD: We'll need to outsource certain events to non-ACPI
562                  *      drivers via the device manager (device.c).
563                  */
564                 break;
565
566         case ACPI_NOTIFY_DEVICE_WAKE:
567                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
568                                   "Received DEVICE WAKE notification for device [%s]\n",
569                                   device->pnp.bus_id));
570                 /* TBD */
571                 break;
572
573         case ACPI_NOTIFY_EJECT_REQUEST:
574                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
575                                   "Received EJECT REQUEST notification for device [%s]\n",
576                                   device->pnp.bus_id));
577                 /* TBD */
578                 break;
579
580         case ACPI_NOTIFY_DEVICE_CHECK_LIGHT:
581                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
582                                   "Received DEVICE CHECK LIGHT notification for device [%s]\n",
583                                   device->pnp.bus_id));
584                 /* TBD: Exactly what does 'light' mean? */
585                 break;
586
587         case ACPI_NOTIFY_FREQUENCY_MISMATCH:
588                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
589                                   "Received FREQUENCY MISMATCH notification for device [%s]\n",
590                                   device->pnp.bus_id));
591                 /* TBD */
592                 break;
593
594         case ACPI_NOTIFY_BUS_MODE_MISMATCH:
595                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
596                                   "Received BUS MODE MISMATCH notification for device [%s]\n",
597                                   device->pnp.bus_id));
598                 /* TBD */
599                 break;
600
601         case ACPI_NOTIFY_POWER_FAULT:
602                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
603                                   "Received POWER FAULT notification for device [%s]\n",
604                                   device->pnp.bus_id));
605                 /* TBD */
606                 break;
607
608         default:
609                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
610                                   "Received unknown/unsupported notification [%08x]\n",
611                                   type));
612                 break;
613         }
614
615         return;
616 }
617
618 /* --------------------------------------------------------------------------
619                              Initialization/Cleanup
620    -------------------------------------------------------------------------- */
621
622 static int __init acpi_bus_init_irq(void)
623 {
624         acpi_status status = AE_OK;
625         union acpi_object arg = { ACPI_TYPE_INTEGER };
626         struct acpi_object_list arg_list = { 1, &arg };
627         char *message = NULL;
628
629
630         /*
631          * Let the system know what interrupt model we are using by
632          * evaluating the \_PIC object, if exists.
633          */
634
635         switch (acpi_irq_model) {
636         case ACPI_IRQ_MODEL_PIC:
637                 message = "PIC";
638                 break;
639         case ACPI_IRQ_MODEL_IOAPIC:
640                 message = "IOAPIC";
641                 break;
642         case ACPI_IRQ_MODEL_IOSAPIC:
643                 message = "IOSAPIC";
644                 break;
645         case ACPI_IRQ_MODEL_PLATFORM:
646                 message = "platform specific model";
647                 break;
648         default:
649                 printk(KERN_WARNING PREFIX "Unknown interrupt routing model\n");
650                 return -ENODEV;
651         }
652
653         printk(KERN_INFO PREFIX "Using %s for interrupt routing\n", message);
654
655         arg.integer.value = acpi_irq_model;
656
657         status = acpi_evaluate_object(NULL, "\\_PIC", &arg_list, NULL);
658         if (ACPI_FAILURE(status) && (status != AE_NOT_FOUND)) {
659                 ACPI_EXCEPTION((AE_INFO, status, "Evaluating _PIC"));
660                 return -ENODEV;
661         }
662
663         return 0;
664 }
665
666 u8 acpi_gbl_permanent_mmap;
667
668
669 void __init acpi_early_init(void)
670 {
671         acpi_status status = AE_OK;
672
673         if (acpi_disabled)
674                 return;
675
676         printk(KERN_INFO PREFIX "Core revision %08x\n", ACPI_CA_VERSION);
677
678         /* enable workarounds, unless strict ACPI spec. compliance */
679         if (!acpi_strict)
680                 acpi_gbl_enable_interpreter_slack = TRUE;
681
682         acpi_gbl_permanent_mmap = 1;
683
684         status = acpi_reallocate_root_table();
685         if (ACPI_FAILURE(status)) {
686                 printk(KERN_ERR PREFIX
687                        "Unable to reallocate ACPI tables\n");
688                 goto error0;
689         }
690
691         status = acpi_initialize_subsystem();
692         if (ACPI_FAILURE(status)) {
693                 printk(KERN_ERR PREFIX
694                        "Unable to initialize the ACPI Interpreter\n");
695                 goto error0;
696         }
697
698         status = acpi_load_tables();
699         if (ACPI_FAILURE(status)) {
700                 printk(KERN_ERR PREFIX
701                        "Unable to load the System Description Tables\n");
702                 goto error0;
703         }
704
705 #ifdef CONFIG_X86
706         if (!acpi_ioapic) {
707                 /* compatible (0) means level (3) */
708                 if (!(acpi_sci_flags & ACPI_MADT_TRIGGER_MASK)) {
709                         acpi_sci_flags &= ~ACPI_MADT_TRIGGER_MASK;
710                         acpi_sci_flags |= ACPI_MADT_TRIGGER_LEVEL;
711                 }
712                 /* Set PIC-mode SCI trigger type */
713                 acpi_pic_sci_set_trigger(acpi_gbl_FADT.sci_interrupt,
714                                          (acpi_sci_flags & ACPI_MADT_TRIGGER_MASK) >> 2);
715         } else {
716                 /*
717                  * now that acpi_gbl_FADT is initialized,
718                  * update it with result from INT_SRC_OVR parsing
719                  */
720                 acpi_gbl_FADT.sci_interrupt = acpi_sci_override_gsi;
721         }
722 #endif
723
724         status =
725             acpi_enable_subsystem(~
726                                   (ACPI_NO_HARDWARE_INIT |
727                                    ACPI_NO_ACPI_ENABLE));
728         if (ACPI_FAILURE(status)) {
729                 printk(KERN_ERR PREFIX "Unable to enable ACPI\n");
730                 goto error0;
731         }
732
733         return;
734
735       error0:
736         disable_acpi();
737         return;
738 }
739
740 static int __init acpi_bus_init(void)
741 {
742         int result = 0;
743         acpi_status status = AE_OK;
744         extern acpi_status acpi_os_initialize1(void);
745
746
747         status = acpi_os_initialize1();
748
749         status =
750             acpi_enable_subsystem(ACPI_NO_HARDWARE_INIT | ACPI_NO_ACPI_ENABLE);
751         if (ACPI_FAILURE(status)) {
752                 printk(KERN_ERR PREFIX
753                        "Unable to start the ACPI Interpreter\n");
754                 goto error1;
755         }
756
757         if (ACPI_FAILURE(status)) {
758                 printk(KERN_ERR PREFIX
759                        "Unable to initialize ACPI OS objects\n");
760                 goto error1;
761         }
762 #ifdef CONFIG_ACPI_EC
763         /*
764          * ACPI 2.0 requires the EC driver to be loaded and work before
765          * the EC device is found in the namespace (i.e. before acpi_initialize_objects()
766          * is called).
767          *
768          * This is accomplished by looking for the ECDT table, and getting
769          * the EC parameters out of that.
770          */
771         status = acpi_ec_ecdt_probe();
772         /* Ignore result. Not having an ECDT is not fatal. */
773 #endif
774
775         status = acpi_initialize_objects(ACPI_FULL_INITIALIZATION);
776         if (ACPI_FAILURE(status)) {
777                 printk(KERN_ERR PREFIX "Unable to initialize ACPI objects\n");
778                 goto error1;
779         }
780
781         printk(KERN_INFO PREFIX "Interpreter enabled\n");
782
783         /* Initialize sleep structures */
784         acpi_sleep_init();
785
786         /*
787          * Get the system interrupt model and evaluate \_PIC.
788          */
789         result = acpi_bus_init_irq();
790         if (result)
791                 goto error1;
792
793         /*
794          * Register the for all standard device notifications.
795          */
796         status =
797             acpi_install_notify_handler(ACPI_ROOT_OBJECT, ACPI_SYSTEM_NOTIFY,
798                                         &acpi_bus_notify, NULL);
799         if (ACPI_FAILURE(status)) {
800                 printk(KERN_ERR PREFIX
801                        "Unable to register for device notifications\n");
802                 goto error1;
803         }
804
805         /*
806          * Create the top ACPI proc directory
807          */
808         acpi_root_dir = proc_mkdir(ACPI_BUS_FILE_ROOT, NULL);
809
810         return 0;
811
812         /* Mimic structured exception handling */
813       error1:
814         acpi_terminate();
815         return -ENODEV;
816 }
817
818 struct kobject *acpi_kobj;
819
820 static int __init acpi_init(void)
821 {
822         int result = 0;
823
824
825         if (acpi_disabled) {
826                 printk(KERN_INFO PREFIX "Interpreter disabled.\n");
827                 return -ENODEV;
828         }
829
830         acpi_kobj = kobject_create_and_add("acpi", firmware_kobj);
831         if (!acpi_kobj) {
832                 printk(KERN_WARNING "%s: kset create error\n", __func__);
833                 acpi_kobj = NULL;
834         }
835
836         result = acpi_bus_init();
837
838         if (!result) {
839                 pci_mmcfg_late_init();
840                 if (!(pm_flags & PM_APM))
841                         pm_flags |= PM_ACPI;
842                 else {
843                         printk(KERN_INFO PREFIX
844                                "APM is already active, exiting\n");
845                         disable_acpi();
846                         result = -ENODEV;
847                 }
848         } else
849                 disable_acpi();
850         /*
851          * If the laptop falls into the DMI check table, the power state check
852          * will be disabled in the course of device power transistion.
853          */
854         dmi_check_system(power_nocheck_dmi_table);
855         return result;
856 }
857
858 subsys_initcall(acpi_init);