743576bf1bd79e5e7b8c6fc10bafb674d88c8803
[sfrench/cifs-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 #include <linux/slab.h>
36 #ifdef CONFIG_X86
37 #include <asm/mpspec.h>
38 #endif
39 #include <linux/pci.h>
40 #include <acpi/acpi_bus.h>
41 #include <acpi/acpi_drivers.h>
42 #include <linux/dmi.h>
43
44 #include "internal.h"
45
46 #define _COMPONENT              ACPI_BUS_COMPONENT
47 ACPI_MODULE_NAME("bus");
48
49 struct acpi_device *acpi_root;
50 struct proc_dir_entry *acpi_root_dir;
51 EXPORT_SYMBOL(acpi_root_dir);
52
53 #define STRUCT_TO_INT(s)        (*((int*)&s))
54
55 static int set_power_nocheck(const struct dmi_system_id *id)
56 {
57         printk(KERN_NOTICE PREFIX "%s detected - "
58                 "disable power check in power transistion\n", id->ident);
59         acpi_power_nocheck = 1;
60         return 0;
61 }
62 static struct dmi_system_id __cpuinitdata power_nocheck_dmi_table[] = {
63         {
64         set_power_nocheck, "HP Pavilion 05", {
65         DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies LTD"),
66         DMI_MATCH(DMI_SYS_VENDOR, "HP Pavilion 05"),
67         DMI_MATCH(DMI_PRODUCT_VERSION, "2001211RE101GLEND") }, NULL},
68         {},
69 };
70
71
72 /* --------------------------------------------------------------------------
73                                 Device Management
74    -------------------------------------------------------------------------- */
75
76 int acpi_bus_get_device(acpi_handle handle, struct acpi_device **device)
77 {
78         acpi_status status = AE_OK;
79
80
81         if (!device)
82                 return -EINVAL;
83
84         /* TBD: Support fixed-feature devices */
85
86         status = acpi_get_data(handle, acpi_bus_data_handler, (void **)device);
87         if (ACPI_FAILURE(status) || !*device) {
88                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "No context for object [%p]\n",
89                                   handle));
90                 return -ENODEV;
91         }
92
93         return 0;
94 }
95
96 EXPORT_SYMBOL(acpi_bus_get_device);
97
98 acpi_status acpi_bus_get_status_handle(acpi_handle handle,
99                                        unsigned long long *sta)
100 {
101         acpi_status status;
102
103         status = acpi_evaluate_integer(handle, "_STA", NULL, sta);
104         if (ACPI_SUCCESS(status))
105                 return AE_OK;
106
107         if (status == AE_NOT_FOUND) {
108                 *sta = ACPI_STA_DEVICE_PRESENT | ACPI_STA_DEVICE_ENABLED |
109                        ACPI_STA_DEVICE_UI      | ACPI_STA_DEVICE_FUNCTIONING;
110                 return AE_OK;
111         }
112         return status;
113 }
114
115 int acpi_bus_get_status(struct acpi_device *device)
116 {
117         acpi_status status;
118         unsigned long long sta;
119
120         status = acpi_bus_get_status_handle(device->handle, &sta);
121         if (ACPI_FAILURE(status))
122                 return -ENODEV;
123
124         STRUCT_TO_INT(device->status) = (int) sta;
125
126         if (device->status.functional && !device->status.present) {
127                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Device [%s] status [%08x]: "
128                        "functional but not present;\n",
129                         device->pnp.bus_id,
130                         (u32) STRUCT_TO_INT(device->status)));
131         }
132
133         ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Device [%s] status [%08x]\n",
134                           device->pnp.bus_id,
135                           (u32) STRUCT_TO_INT(device->status)));
136         return 0;
137 }
138 EXPORT_SYMBOL(acpi_bus_get_status);
139
140 void acpi_bus_private_data_handler(acpi_handle handle,
141                                    void *context)
142 {
143         return;
144 }
145 EXPORT_SYMBOL(acpi_bus_private_data_handler);
146
147 int acpi_bus_get_private_data(acpi_handle handle, void **data)
148 {
149         acpi_status status = AE_OK;
150
151         if (!*data)
152                 return -EINVAL;
153
154         status = acpi_get_data(handle, acpi_bus_private_data_handler, data);
155         if (ACPI_FAILURE(status) || !*data) {
156                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "No context for object [%p]\n",
157                                 handle));
158                 return -ENODEV;
159         }
160
161         return 0;
162 }
163 EXPORT_SYMBOL(acpi_bus_get_private_data);
164
165 /* --------------------------------------------------------------------------
166                                  Power Management
167    -------------------------------------------------------------------------- */
168
169 int acpi_bus_get_power(acpi_handle handle, int *state)
170 {
171         int result = 0;
172         acpi_status status = 0;
173         struct acpi_device *device = NULL;
174         unsigned long long psc = 0;
175
176
177         result = acpi_bus_get_device(handle, &device);
178         if (result)
179                 return result;
180
181         *state = ACPI_STATE_UNKNOWN;
182
183         if (!device->flags.power_manageable) {
184                 /* TBD: Non-recursive algorithm for walking up hierarchy */
185                 if (device->parent)
186                         *state = device->parent->power.state;
187                 else
188                         *state = ACPI_STATE_D0;
189         } else {
190                 /*
191                  * Get the device's power state either directly (via _PSC) or
192                  * indirectly (via power resources).
193                  */
194                 if (device->power.flags.power_resources) {
195                         result = acpi_power_get_inferred_state(device);
196                         if (result)
197                                 return result;
198                 } else if (device->power.flags.explicit_get) {
199                         status = acpi_evaluate_integer(device->handle, "_PSC",
200                                                        NULL, &psc);
201                         if (ACPI_FAILURE(status))
202                                 return -ENODEV;
203                         device->power.state = (int)psc;
204                 }
205
206                 *state = device->power.state;
207         }
208
209         ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Device [%s] power state is D%d\n",
210                           device->pnp.bus_id, device->power.state));
211
212         return 0;
213 }
214
215 EXPORT_SYMBOL(acpi_bus_get_power);
216
217 int acpi_bus_set_power(acpi_handle handle, int state)
218 {
219         int result = 0;
220         acpi_status status = AE_OK;
221         struct acpi_device *device = NULL;
222         char object_name[5] = { '_', 'P', 'S', '0' + state, '\0' };
223
224
225         result = acpi_bus_get_device(handle, &device);
226         if (result)
227                 return result;
228
229         if ((state < ACPI_STATE_D0) || (state > ACPI_STATE_D3))
230                 return -EINVAL;
231
232         /* Make sure this is a valid target state */
233
234         if (!device->flags.power_manageable) {
235                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Device `[%s]' is not power manageable\n",
236                                 kobject_name(&device->dev.kobj)));
237                 return -ENODEV;
238         }
239         /*
240          * Get device's current power state
241          */
242         if (!acpi_power_nocheck) {
243                 /*
244                  * Maybe the incorrect power state is returned on the bogus
245                  * bios, which is different with the real power state.
246                  * For example: the bios returns D0 state and the real power
247                  * state is D3. OS expects to set the device to D0 state. In
248                  * such case if OS uses the power state returned by the BIOS,
249                  * the device can't be transisted to the correct power state.
250                  * So if the acpi_power_nocheck is set, it is unnecessary to
251                  * get the power state by calling acpi_bus_get_power.
252                  */
253                 acpi_bus_get_power(device->handle, &device->power.state);
254         }
255         if ((state == device->power.state) && !device->flags.force_power_state) {
256                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Device is already at D%d\n",
257                                   state));
258                 return 0;
259         }
260
261         if (!device->power.states[state].flags.valid) {
262                 printk(KERN_WARNING PREFIX "Device does not support D%d\n", state);
263                 return -ENODEV;
264         }
265         if (device->parent && (state < device->parent->power.state)) {
266                 printk(KERN_WARNING PREFIX
267                               "Cannot set device to a higher-powered"
268                               " state than parent\n");
269                 return -ENODEV;
270         }
271
272         /*
273          * Transition Power
274          * ----------------
275          * On transitions to a high-powered state we first apply power (via
276          * power resources) then evalute _PSx.  Conversly for transitions to
277          * a lower-powered state.
278          */
279         if (state < device->power.state) {
280                 if (device->power.flags.power_resources) {
281                         result = acpi_power_transition(device, state);
282                         if (result)
283                                 goto end;
284                 }
285                 if (device->power.states[state].flags.explicit_set) {
286                         status = acpi_evaluate_object(device->handle,
287                                                       object_name, NULL, NULL);
288                         if (ACPI_FAILURE(status)) {
289                                 result = -ENODEV;
290                                 goto end;
291                         }
292                 }
293         } else {
294                 if (device->power.states[state].flags.explicit_set) {
295                         status = acpi_evaluate_object(device->handle,
296                                                       object_name, NULL, NULL);
297                         if (ACPI_FAILURE(status)) {
298                                 result = -ENODEV;
299                                 goto end;
300                         }
301                 }
302                 if (device->power.flags.power_resources) {
303                         result = acpi_power_transition(device, state);
304                         if (result)
305                                 goto end;
306                 }
307         }
308
309       end:
310         if (result)
311                 printk(KERN_WARNING PREFIX
312                               "Device [%s] failed to transition to D%d\n",
313                               device->pnp.bus_id, state);
314         else {
315                 device->power.state = state;
316                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
317                                   "Device [%s] transitioned to D%d\n",
318                                   device->pnp.bus_id, state));
319         }
320
321         return result;
322 }
323
324 EXPORT_SYMBOL(acpi_bus_set_power);
325
326 bool acpi_bus_power_manageable(acpi_handle handle)
327 {
328         struct acpi_device *device;
329         int result;
330
331         result = acpi_bus_get_device(handle, &device);
332         return result ? false : device->flags.power_manageable;
333 }
334
335 EXPORT_SYMBOL(acpi_bus_power_manageable);
336
337 bool acpi_bus_can_wakeup(acpi_handle handle)
338 {
339         struct acpi_device *device;
340         int result;
341
342         result = acpi_bus_get_device(handle, &device);
343         return result ? false : device->wakeup.flags.valid;
344 }
345
346 EXPORT_SYMBOL(acpi_bus_can_wakeup);
347
348 static void acpi_print_osc_error(acpi_handle handle,
349         struct acpi_osc_context *context, char *error)
350 {
351         struct acpi_buffer buffer = {ACPI_ALLOCATE_BUFFER};
352         int i;
353
354         if (ACPI_FAILURE(acpi_get_name(handle, ACPI_FULL_PATHNAME, &buffer)))
355                 printk(KERN_DEBUG "%s\n", error);
356         else {
357                 printk(KERN_DEBUG "%s:%s\n", (char *)buffer.pointer, error);
358                 kfree(buffer.pointer);
359         }
360         printk(KERN_DEBUG"_OSC request data:");
361         for (i = 0; i < context->cap.length; i += sizeof(u32))
362                 printk("%x ", *((u32 *)(context->cap.pointer + i)));
363         printk("\n");
364 }
365
366 static u8 hex_val(unsigned char c)
367 {
368         return isdigit(c) ? c - '0' : toupper(c) - 'A' + 10;
369 }
370
371 static acpi_status acpi_str_to_uuid(char *str, u8 *uuid)
372 {
373         int i;
374         static int opc_map_to_uuid[16] = {6, 4, 2, 0, 11, 9, 16, 14, 19, 21,
375                 24, 26, 28, 30, 32, 34};
376
377         if (strlen(str) != 36)
378                 return AE_BAD_PARAMETER;
379         for (i = 0; i < 36; i++) {
380                 if (i == 8 || i == 13 || i == 18 || i == 23) {
381                         if (str[i] != '-')
382                                 return AE_BAD_PARAMETER;
383                 } else if (!isxdigit(str[i]))
384                         return AE_BAD_PARAMETER;
385         }
386         for (i = 0; i < 16; i++) {
387                 uuid[i] = hex_val(str[opc_map_to_uuid[i]]) << 4;
388                 uuid[i] |= hex_val(str[opc_map_to_uuid[i] + 1]);
389         }
390         return AE_OK;
391 }
392
393 acpi_status acpi_run_osc(acpi_handle handle, struct acpi_osc_context *context)
394 {
395         acpi_status status;
396         struct acpi_object_list input;
397         union acpi_object in_params[4];
398         union acpi_object *out_obj;
399         u8 uuid[16];
400         u32 errors;
401         struct acpi_buffer output = {ACPI_ALLOCATE_BUFFER, NULL};
402
403         if (!context)
404                 return AE_ERROR;
405         if (ACPI_FAILURE(acpi_str_to_uuid(context->uuid_str, uuid)))
406                 return AE_ERROR;
407         context->ret.length = ACPI_ALLOCATE_BUFFER;
408         context->ret.pointer = NULL;
409
410         /* Setting up input parameters */
411         input.count = 4;
412         input.pointer = in_params;
413         in_params[0].type               = ACPI_TYPE_BUFFER;
414         in_params[0].buffer.length      = 16;
415         in_params[0].buffer.pointer     = uuid;
416         in_params[1].type               = ACPI_TYPE_INTEGER;
417         in_params[1].integer.value      = context->rev;
418         in_params[2].type               = ACPI_TYPE_INTEGER;
419         in_params[2].integer.value      = context->cap.length/sizeof(u32);
420         in_params[3].type               = ACPI_TYPE_BUFFER;
421         in_params[3].buffer.length      = context->cap.length;
422         in_params[3].buffer.pointer     = context->cap.pointer;
423
424         status = acpi_evaluate_object(handle, "_OSC", &input, &output);
425         if (ACPI_FAILURE(status))
426                 return status;
427
428         if (!output.length)
429                 return AE_NULL_OBJECT;
430
431         out_obj = output.pointer;
432         if (out_obj->type != ACPI_TYPE_BUFFER
433                 || out_obj->buffer.length != context->cap.length) {
434                 acpi_print_osc_error(handle, context,
435                         "_OSC evaluation returned wrong type");
436                 status = AE_TYPE;
437                 goto out_kfree;
438         }
439         /* Need to ignore the bit0 in result code */
440         errors = *((u32 *)out_obj->buffer.pointer) & ~(1 << 0);
441         if (errors) {
442                 if (errors & OSC_REQUEST_ERROR)
443                         acpi_print_osc_error(handle, context,
444                                 "_OSC request failed");
445                 if (errors & OSC_INVALID_UUID_ERROR)
446                         acpi_print_osc_error(handle, context,
447                                 "_OSC invalid UUID");
448                 if (errors & OSC_INVALID_REVISION_ERROR)
449                         acpi_print_osc_error(handle, context,
450                                 "_OSC invalid revision");
451                 if (errors & OSC_CAPABILITIES_MASK_ERROR) {
452                         if (((u32 *)context->cap.pointer)[OSC_QUERY_TYPE]
453                             & OSC_QUERY_ENABLE)
454                                 goto out_success;
455                         status = AE_SUPPORT;
456                         goto out_kfree;
457                 }
458                 status = AE_ERROR;
459                 goto out_kfree;
460         }
461 out_success:
462         context->ret.length = out_obj->buffer.length;
463         context->ret.pointer = kmalloc(context->ret.length, GFP_KERNEL);
464         if (!context->ret.pointer) {
465                 status =  AE_NO_MEMORY;
466                 goto out_kfree;
467         }
468         memcpy(context->ret.pointer, out_obj->buffer.pointer,
469                 context->ret.length);
470         status =  AE_OK;
471
472 out_kfree:
473         kfree(output.pointer);
474         if (status != AE_OK)
475                 context->ret.pointer = NULL;
476         return status;
477 }
478 EXPORT_SYMBOL(acpi_run_osc);
479
480 static u8 sb_uuid_str[] = "0811B06E-4A27-44F9-8D60-3CBBC22E7B48";
481 static void acpi_bus_osc_support(void)
482 {
483         u32 capbuf[2];
484         struct acpi_osc_context context = {
485                 .uuid_str = sb_uuid_str,
486                 .rev = 1,
487                 .cap.length = 8,
488                 .cap.pointer = capbuf,
489         };
490         acpi_handle handle;
491
492         capbuf[OSC_QUERY_TYPE] = OSC_QUERY_ENABLE;
493         capbuf[OSC_SUPPORT_TYPE] = OSC_SB_PR3_SUPPORT; /* _PR3 is in use */
494 #if defined(CONFIG_ACPI_PROCESSOR_AGGREGATOR) ||\
495                         defined(CONFIG_ACPI_PROCESSOR_AGGREGATOR_MODULE)
496         capbuf[OSC_SUPPORT_TYPE] |= OSC_SB_PAD_SUPPORT;
497 #endif
498
499 #if defined(CONFIG_ACPI_PROCESSOR) || defined(CONFIG_ACPI_PROCESSOR_MODULE)
500         capbuf[OSC_SUPPORT_TYPE] |= OSC_SB_PPC_OST_SUPPORT;
501 #endif
502         if (ACPI_FAILURE(acpi_get_handle(NULL, "\\_SB", &handle)))
503                 return;
504         if (ACPI_SUCCESS(acpi_run_osc(handle, &context)))
505                 kfree(context.ret.pointer);
506         /* do we need to check the returned cap? Sounds no */
507 }
508
509 /* --------------------------------------------------------------------------
510                                 Event Management
511    -------------------------------------------------------------------------- */
512
513 #ifdef CONFIG_ACPI_PROC_EVENT
514 static DEFINE_SPINLOCK(acpi_bus_event_lock);
515
516 LIST_HEAD(acpi_bus_event_list);
517 DECLARE_WAIT_QUEUE_HEAD(acpi_bus_event_queue);
518
519 extern int event_is_open;
520
521 int acpi_bus_generate_proc_event4(const char *device_class, const char *bus_id, u8 type, int data)
522 {
523         struct acpi_bus_event *event;
524         unsigned long flags = 0;
525
526         /* drop event on the floor if no one's listening */
527         if (!event_is_open)
528                 return 0;
529
530         event = kzalloc(sizeof(struct acpi_bus_event), GFP_ATOMIC);
531         if (!event)
532                 return -ENOMEM;
533
534         strcpy(event->device_class, device_class);
535         strcpy(event->bus_id, bus_id);
536         event->type = type;
537         event->data = data;
538
539         spin_lock_irqsave(&acpi_bus_event_lock, flags);
540         list_add_tail(&event->node, &acpi_bus_event_list);
541         spin_unlock_irqrestore(&acpi_bus_event_lock, flags);
542
543         wake_up_interruptible(&acpi_bus_event_queue);
544
545         return 0;
546
547 }
548
549 EXPORT_SYMBOL_GPL(acpi_bus_generate_proc_event4);
550
551 int acpi_bus_generate_proc_event(struct acpi_device *device, u8 type, int data)
552 {
553         if (!device)
554                 return -EINVAL;
555         return acpi_bus_generate_proc_event4(device->pnp.device_class,
556                                              device->pnp.bus_id, type, data);
557 }
558
559 EXPORT_SYMBOL(acpi_bus_generate_proc_event);
560
561 int acpi_bus_receive_event(struct acpi_bus_event *event)
562 {
563         unsigned long flags = 0;
564         struct acpi_bus_event *entry = NULL;
565
566         DECLARE_WAITQUEUE(wait, current);
567
568
569         if (!event)
570                 return -EINVAL;
571
572         if (list_empty(&acpi_bus_event_list)) {
573
574                 set_current_state(TASK_INTERRUPTIBLE);
575                 add_wait_queue(&acpi_bus_event_queue, &wait);
576
577                 if (list_empty(&acpi_bus_event_list))
578                         schedule();
579
580                 remove_wait_queue(&acpi_bus_event_queue, &wait);
581                 set_current_state(TASK_RUNNING);
582
583                 if (signal_pending(current))
584                         return -ERESTARTSYS;
585         }
586
587         spin_lock_irqsave(&acpi_bus_event_lock, flags);
588         if (!list_empty(&acpi_bus_event_list)) {
589                 entry = list_entry(acpi_bus_event_list.next,
590                                    struct acpi_bus_event, node);
591                 list_del(&entry->node);
592         }
593         spin_unlock_irqrestore(&acpi_bus_event_lock, flags);
594
595         if (!entry)
596                 return -ENODEV;
597
598         memcpy(event, entry, sizeof(struct acpi_bus_event));
599
600         kfree(entry);
601
602         return 0;
603 }
604
605 #endif  /* CONFIG_ACPI_PROC_EVENT */
606
607 /* --------------------------------------------------------------------------
608                              Notification Handling
609    -------------------------------------------------------------------------- */
610
611 static void acpi_bus_check_device(acpi_handle handle)
612 {
613         struct acpi_device *device;
614         acpi_status status;
615         struct acpi_device_status old_status;
616
617         if (acpi_bus_get_device(handle, &device))
618                 return;
619         if (!device)
620                 return;
621
622         old_status = device->status;
623
624         /*
625          * Make sure this device's parent is present before we go about
626          * messing with the device.
627          */
628         if (device->parent && !device->parent->status.present) {
629                 device->status = device->parent->status;
630                 return;
631         }
632
633         status = acpi_bus_get_status(device);
634         if (ACPI_FAILURE(status))
635                 return;
636
637         if (STRUCT_TO_INT(old_status) == STRUCT_TO_INT(device->status))
638                 return;
639
640         /*
641          * Device Insertion/Removal
642          */
643         if ((device->status.present) && !(old_status.present)) {
644                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Device insertion detected\n"));
645                 /* TBD: Handle device insertion */
646         } else if (!(device->status.present) && (old_status.present)) {
647                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Device removal detected\n"));
648                 /* TBD: Handle device removal */
649         }
650 }
651
652 static void acpi_bus_check_scope(acpi_handle handle)
653 {
654         /* Status Change? */
655         acpi_bus_check_device(handle);
656
657         /*
658          * TBD: Enumerate child devices within this device's scope and
659          *       run acpi_bus_check_device()'s on them.
660          */
661 }
662
663 static BLOCKING_NOTIFIER_HEAD(acpi_bus_notify_list);
664 int register_acpi_bus_notifier(struct notifier_block *nb)
665 {
666         return blocking_notifier_chain_register(&acpi_bus_notify_list, nb);
667 }
668 EXPORT_SYMBOL_GPL(register_acpi_bus_notifier);
669
670 void unregister_acpi_bus_notifier(struct notifier_block *nb)
671 {
672         blocking_notifier_chain_unregister(&acpi_bus_notify_list, nb);
673 }
674 EXPORT_SYMBOL_GPL(unregister_acpi_bus_notifier);
675
676 /**
677  * acpi_bus_notify
678  * ---------------
679  * Callback for all 'system-level' device notifications (values 0x00-0x7F).
680  */
681 static void acpi_bus_notify(acpi_handle handle, u32 type, void *data)
682 {
683         struct acpi_device *device = NULL;
684         struct acpi_driver *driver;
685
686         ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Notification %#02x to handle %p\n",
687                           type, handle));
688
689         blocking_notifier_call_chain(&acpi_bus_notify_list,
690                 type, (void *)handle);
691
692         switch (type) {
693
694         case ACPI_NOTIFY_BUS_CHECK:
695                 acpi_bus_check_scope(handle);
696                 /*
697                  * TBD: We'll need to outsource certain events to non-ACPI
698                  *      drivers via the device manager (device.c).
699                  */
700                 break;
701
702         case ACPI_NOTIFY_DEVICE_CHECK:
703                 acpi_bus_check_device(handle);
704                 /*
705                  * TBD: We'll need to outsource certain events to non-ACPI
706                  *      drivers via the device manager (device.c).
707                  */
708                 break;
709
710         case ACPI_NOTIFY_DEVICE_WAKE:
711                 /* TBD */
712                 break;
713
714         case ACPI_NOTIFY_EJECT_REQUEST:
715                 /* TBD */
716                 break;
717
718         case ACPI_NOTIFY_DEVICE_CHECK_LIGHT:
719                 /* TBD: Exactly what does 'light' mean? */
720                 break;
721
722         case ACPI_NOTIFY_FREQUENCY_MISMATCH:
723                 /* TBD */
724                 break;
725
726         case ACPI_NOTIFY_BUS_MODE_MISMATCH:
727                 /* TBD */
728                 break;
729
730         case ACPI_NOTIFY_POWER_FAULT:
731                 /* TBD */
732                 break;
733
734         default:
735                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
736                                   "Received unknown/unsupported notification [%08x]\n",
737                                   type));
738                 break;
739         }
740
741         acpi_bus_get_device(handle, &device);
742         if (device) {
743                 driver = device->driver;
744                 if (driver && driver->ops.notify &&
745                     (driver->flags & ACPI_DRIVER_ALL_NOTIFY_EVENTS))
746                         driver->ops.notify(device, type);
747         }
748 }
749
750 /* --------------------------------------------------------------------------
751                              Initialization/Cleanup
752    -------------------------------------------------------------------------- */
753
754 static int __init acpi_bus_init_irq(void)
755 {
756         acpi_status status = AE_OK;
757         union acpi_object arg = { ACPI_TYPE_INTEGER };
758         struct acpi_object_list arg_list = { 1, &arg };
759         char *message = NULL;
760
761
762         /*
763          * Let the system know what interrupt model we are using by
764          * evaluating the \_PIC object, if exists.
765          */
766
767         switch (acpi_irq_model) {
768         case ACPI_IRQ_MODEL_PIC:
769                 message = "PIC";
770                 break;
771         case ACPI_IRQ_MODEL_IOAPIC:
772                 message = "IOAPIC";
773                 break;
774         case ACPI_IRQ_MODEL_IOSAPIC:
775                 message = "IOSAPIC";
776                 break;
777         case ACPI_IRQ_MODEL_PLATFORM:
778                 message = "platform specific model";
779                 break;
780         default:
781                 printk(KERN_WARNING PREFIX "Unknown interrupt routing model\n");
782                 return -ENODEV;
783         }
784
785         printk(KERN_INFO PREFIX "Using %s for interrupt routing\n", message);
786
787         arg.integer.value = acpi_irq_model;
788
789         status = acpi_evaluate_object(NULL, "\\_PIC", &arg_list, NULL);
790         if (ACPI_FAILURE(status) && (status != AE_NOT_FOUND)) {
791                 ACPI_EXCEPTION((AE_INFO, status, "Evaluating _PIC"));
792                 return -ENODEV;
793         }
794
795         return 0;
796 }
797
798 u8 acpi_gbl_permanent_mmap;
799
800
801 void __init acpi_early_init(void)
802 {
803         acpi_status status = AE_OK;
804
805         if (acpi_disabled)
806                 return;
807
808         printk(KERN_INFO PREFIX "Core revision %08x\n", ACPI_CA_VERSION);
809
810         /* enable workarounds, unless strict ACPI spec. compliance */
811         if (!acpi_strict)
812                 acpi_gbl_enable_interpreter_slack = TRUE;
813
814         acpi_gbl_permanent_mmap = 1;
815
816         status = acpi_reallocate_root_table();
817         if (ACPI_FAILURE(status)) {
818                 printk(KERN_ERR PREFIX
819                        "Unable to reallocate ACPI tables\n");
820                 goto error0;
821         }
822
823         status = acpi_initialize_subsystem();
824         if (ACPI_FAILURE(status)) {
825                 printk(KERN_ERR PREFIX
826                        "Unable to initialize the ACPI Interpreter\n");
827                 goto error0;
828         }
829
830         status = acpi_load_tables();
831         if (ACPI_FAILURE(status)) {
832                 printk(KERN_ERR PREFIX
833                        "Unable to load the System Description Tables\n");
834                 goto error0;
835         }
836
837 #ifdef CONFIG_X86
838         if (!acpi_ioapic) {
839                 /* compatible (0) means level (3) */
840                 if (!(acpi_sci_flags & ACPI_MADT_TRIGGER_MASK)) {
841                         acpi_sci_flags &= ~ACPI_MADT_TRIGGER_MASK;
842                         acpi_sci_flags |= ACPI_MADT_TRIGGER_LEVEL;
843                 }
844                 /* Set PIC-mode SCI trigger type */
845                 acpi_pic_sci_set_trigger(acpi_gbl_FADT.sci_interrupt,
846                                          (acpi_sci_flags & ACPI_MADT_TRIGGER_MASK) >> 2);
847         } else {
848                 /*
849                  * now that acpi_gbl_FADT is initialized,
850                  * update it with result from INT_SRC_OVR parsing
851                  */
852                 acpi_gbl_FADT.sci_interrupt = acpi_sci_override_gsi;
853         }
854 #endif
855
856         status =
857             acpi_enable_subsystem(~
858                                   (ACPI_NO_HARDWARE_INIT |
859                                    ACPI_NO_ACPI_ENABLE));
860         if (ACPI_FAILURE(status)) {
861                 printk(KERN_ERR PREFIX "Unable to enable ACPI\n");
862                 goto error0;
863         }
864
865         return;
866
867       error0:
868         disable_acpi();
869         return;
870 }
871
872 static int __init acpi_bus_init(void)
873 {
874         int result = 0;
875         acpi_status status = AE_OK;
876         extern acpi_status acpi_os_initialize1(void);
877
878         acpi_os_initialize1();
879
880         status =
881             acpi_enable_subsystem(ACPI_NO_HARDWARE_INIT | ACPI_NO_ACPI_ENABLE);
882         if (ACPI_FAILURE(status)) {
883                 printk(KERN_ERR PREFIX
884                        "Unable to start the ACPI Interpreter\n");
885                 goto error1;
886         }
887
888         /*
889          * ACPI 2.0 requires the EC driver to be loaded and work before
890          * the EC device is found in the namespace (i.e. before acpi_initialize_objects()
891          * is called).
892          *
893          * This is accomplished by looking for the ECDT table, and getting
894          * the EC parameters out of that.
895          */
896         status = acpi_ec_ecdt_probe();
897         /* Ignore result. Not having an ECDT is not fatal. */
898
899         acpi_bus_osc_support();
900
901         status = acpi_initialize_objects(ACPI_FULL_INITIALIZATION);
902         if (ACPI_FAILURE(status)) {
903                 printk(KERN_ERR PREFIX "Unable to initialize ACPI objects\n");
904                 goto error1;
905         }
906
907         acpi_early_processor_set_pdc();
908
909         /*
910          * Maybe EC region is required at bus_scan/acpi_get_devices. So it
911          * is necessary to enable it as early as possible.
912          */
913         acpi_boot_ec_enable();
914
915         printk(KERN_INFO PREFIX "Interpreter enabled\n");
916
917         /* Initialize sleep structures */
918         acpi_sleep_init();
919
920         /*
921          * Get the system interrupt model and evaluate \_PIC.
922          */
923         result = acpi_bus_init_irq();
924         if (result)
925                 goto error1;
926
927         /*
928          * Register the for all standard device notifications.
929          */
930         status =
931             acpi_install_notify_handler(ACPI_ROOT_OBJECT, ACPI_SYSTEM_NOTIFY,
932                                         &acpi_bus_notify, NULL);
933         if (ACPI_FAILURE(status)) {
934                 printk(KERN_ERR PREFIX
935                        "Unable to register for device notifications\n");
936                 goto error1;
937         }
938
939         /*
940          * Create the top ACPI proc directory
941          */
942         acpi_root_dir = proc_mkdir(ACPI_BUS_FILE_ROOT, NULL);
943
944         return 0;
945
946         /* Mimic structured exception handling */
947       error1:
948         acpi_terminate();
949         return -ENODEV;
950 }
951
952 struct kobject *acpi_kobj;
953
954 static int __init acpi_init(void)
955 {
956         int result = 0;
957
958
959         if (acpi_disabled) {
960                 printk(KERN_INFO PREFIX "Interpreter disabled.\n");
961                 return -ENODEV;
962         }
963
964         acpi_kobj = kobject_create_and_add("acpi", firmware_kobj);
965         if (!acpi_kobj) {
966                 printk(KERN_WARNING "%s: kset create error\n", __func__);
967                 acpi_kobj = NULL;
968         }
969
970         init_acpi_device_notify();
971         result = acpi_bus_init();
972
973         if (!result) {
974                 pci_mmcfg_late_init();
975                 if (!(pm_flags & PM_APM))
976                         pm_flags |= PM_ACPI;
977                 else {
978                         printk(KERN_INFO PREFIX
979                                "APM is already active, exiting\n");
980                         disable_acpi();
981                         result = -ENODEV;
982                 }
983         } else
984                 disable_acpi();
985
986         if (acpi_disabled)
987                 return result;
988
989         /*
990          * If the laptop falls into the DMI check table, the power state check
991          * will be disabled in the course of device power transistion.
992          */
993         dmi_check_system(power_nocheck_dmi_table);
994
995         acpi_scan_init();
996         acpi_ec_init();
997         acpi_power_init();
998         acpi_system_init();
999         acpi_debug_init();
1000         acpi_sleep_proc_init();
1001         acpi_wakeup_device_init();
1002         return result;
1003 }
1004
1005 subsys_initcall(acpi_init);