drivers: wireless: use new hex_to_bin() method
[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 #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 #ifdef CONFIG_X86
73 static int set_copy_dsdt(const struct dmi_system_id *id)
74 {
75         printk(KERN_NOTICE "%s detected - "
76                 "force copy of DSDT to local memory\n", id->ident);
77         acpi_gbl_copy_dsdt_locally = 1;
78         return 0;
79 }
80
81 static struct dmi_system_id dsdt_dmi_table[] __initdata = {
82         /*
83          * Insyde BIOS on some TOSHIBA machines corrupt the DSDT.
84          * https://bugzilla.kernel.org/show_bug.cgi?id=14679
85          */
86         {
87          .callback = set_copy_dsdt,
88          .ident = "TOSHIBA Satellite A505",
89          .matches = {
90                 DMI_MATCH(DMI_SYS_VENDOR, "TOSHIBA"),
91                 DMI_MATCH(DMI_PRODUCT_NAME, "Satellite A505"),
92                 },
93         },
94         {
95          .callback = set_copy_dsdt,
96          .ident = "TOSHIBA Satellite L505D",
97          .matches = {
98                 DMI_MATCH(DMI_SYS_VENDOR, "TOSHIBA"),
99                 DMI_MATCH(DMI_PRODUCT_NAME, "Satellite L505D"),
100                 },
101         },
102         {}
103 };
104 #else
105 static struct dmi_system_id dsdt_dmi_table[] __initdata = {
106         {}
107 };
108 #endif
109
110 /* --------------------------------------------------------------------------
111                                 Device Management
112    -------------------------------------------------------------------------- */
113
114 int acpi_bus_get_device(acpi_handle handle, struct acpi_device **device)
115 {
116         acpi_status status = AE_OK;
117
118
119         if (!device)
120                 return -EINVAL;
121
122         /* TBD: Support fixed-feature devices */
123
124         status = acpi_get_data(handle, acpi_bus_data_handler, (void **)device);
125         if (ACPI_FAILURE(status) || !*device) {
126                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "No context for object [%p]\n",
127                                   handle));
128                 return -ENODEV;
129         }
130
131         return 0;
132 }
133
134 EXPORT_SYMBOL(acpi_bus_get_device);
135
136 acpi_status acpi_bus_get_status_handle(acpi_handle handle,
137                                        unsigned long long *sta)
138 {
139         acpi_status status;
140
141         status = acpi_evaluate_integer(handle, "_STA", NULL, sta);
142         if (ACPI_SUCCESS(status))
143                 return AE_OK;
144
145         if (status == AE_NOT_FOUND) {
146                 *sta = ACPI_STA_DEVICE_PRESENT | ACPI_STA_DEVICE_ENABLED |
147                        ACPI_STA_DEVICE_UI      | ACPI_STA_DEVICE_FUNCTIONING;
148                 return AE_OK;
149         }
150         return status;
151 }
152
153 int acpi_bus_get_status(struct acpi_device *device)
154 {
155         acpi_status status;
156         unsigned long long sta;
157
158         status = acpi_bus_get_status_handle(device->handle, &sta);
159         if (ACPI_FAILURE(status))
160                 return -ENODEV;
161
162         STRUCT_TO_INT(device->status) = (int) sta;
163
164         if (device->status.functional && !device->status.present) {
165                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Device [%s] status [%08x]: "
166                        "functional but not present;\n",
167                         device->pnp.bus_id,
168                         (u32) STRUCT_TO_INT(device->status)));
169         }
170
171         ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Device [%s] status [%08x]\n",
172                           device->pnp.bus_id,
173                           (u32) STRUCT_TO_INT(device->status)));
174         return 0;
175 }
176 EXPORT_SYMBOL(acpi_bus_get_status);
177
178 void acpi_bus_private_data_handler(acpi_handle handle,
179                                    void *context)
180 {
181         return;
182 }
183 EXPORT_SYMBOL(acpi_bus_private_data_handler);
184
185 int acpi_bus_get_private_data(acpi_handle handle, void **data)
186 {
187         acpi_status status = AE_OK;
188
189         if (!*data)
190                 return -EINVAL;
191
192         status = acpi_get_data(handle, acpi_bus_private_data_handler, data);
193         if (ACPI_FAILURE(status) || !*data) {
194                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "No context for object [%p]\n",
195                                 handle));
196                 return -ENODEV;
197         }
198
199         return 0;
200 }
201 EXPORT_SYMBOL(acpi_bus_get_private_data);
202
203 /* --------------------------------------------------------------------------
204                                  Power Management
205    -------------------------------------------------------------------------- */
206
207 int acpi_bus_get_power(acpi_handle handle, int *state)
208 {
209         int result = 0;
210         acpi_status status = 0;
211         struct acpi_device *device = NULL;
212         unsigned long long psc = 0;
213
214
215         result = acpi_bus_get_device(handle, &device);
216         if (result)
217                 return result;
218
219         *state = ACPI_STATE_UNKNOWN;
220
221         if (!device->flags.power_manageable) {
222                 /* TBD: Non-recursive algorithm for walking up hierarchy */
223                 if (device->parent)
224                         *state = device->parent->power.state;
225                 else
226                         *state = ACPI_STATE_D0;
227         } else {
228                 /*
229                  * Get the device's power state either directly (via _PSC) or
230                  * indirectly (via power resources).
231                  */
232                 if (device->power.flags.power_resources) {
233                         result = acpi_power_get_inferred_state(device);
234                         if (result)
235                                 return result;
236                 } else if (device->power.flags.explicit_get) {
237                         status = acpi_evaluate_integer(device->handle, "_PSC",
238                                                        NULL, &psc);
239                         if (ACPI_FAILURE(status))
240                                 return -ENODEV;
241                         device->power.state = (int)psc;
242                 }
243
244                 *state = device->power.state;
245         }
246
247         ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Device [%s] power state is D%d\n",
248                           device->pnp.bus_id, device->power.state));
249
250         return 0;
251 }
252
253 EXPORT_SYMBOL(acpi_bus_get_power);
254
255 int acpi_bus_set_power(acpi_handle handle, int state)
256 {
257         int result = 0;
258         acpi_status status = AE_OK;
259         struct acpi_device *device = NULL;
260         char object_name[5] = { '_', 'P', 'S', '0' + state, '\0' };
261
262
263         result = acpi_bus_get_device(handle, &device);
264         if (result)
265                 return result;
266
267         if ((state < ACPI_STATE_D0) || (state > ACPI_STATE_D3))
268                 return -EINVAL;
269
270         /* Make sure this is a valid target state */
271
272         if (!device->flags.power_manageable) {
273                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Device `[%s]' is not power manageable\n",
274                                 kobject_name(&device->dev.kobj)));
275                 return -ENODEV;
276         }
277         /*
278          * Get device's current power state
279          */
280         if (!acpi_power_nocheck) {
281                 /*
282                  * Maybe the incorrect power state is returned on the bogus
283                  * bios, which is different with the real power state.
284                  * For example: the bios returns D0 state and the real power
285                  * state is D3. OS expects to set the device to D0 state. In
286                  * such case if OS uses the power state returned by the BIOS,
287                  * the device can't be transisted to the correct power state.
288                  * So if the acpi_power_nocheck is set, it is unnecessary to
289                  * get the power state by calling acpi_bus_get_power.
290                  */
291                 acpi_bus_get_power(device->handle, &device->power.state);
292         }
293         if ((state == device->power.state) && !device->flags.force_power_state) {
294                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Device is already at D%d\n",
295                                   state));
296                 return 0;
297         }
298
299         if (!device->power.states[state].flags.valid) {
300                 printk(KERN_WARNING PREFIX "Device does not support D%d\n", state);
301                 return -ENODEV;
302         }
303         if (device->parent && (state < device->parent->power.state)) {
304                 printk(KERN_WARNING PREFIX
305                               "Cannot set device to a higher-powered"
306                               " state than parent\n");
307                 return -ENODEV;
308         }
309
310         /*
311          * Transition Power
312          * ----------------
313          * On transitions to a high-powered state we first apply power (via
314          * power resources) then evalute _PSx.  Conversly for transitions to
315          * a lower-powered state.
316          */
317         if (state < device->power.state) {
318                 if (device->power.flags.power_resources) {
319                         result = acpi_power_transition(device, state);
320                         if (result)
321                                 goto end;
322                 }
323                 if (device->power.states[state].flags.explicit_set) {
324                         status = acpi_evaluate_object(device->handle,
325                                                       object_name, NULL, NULL);
326                         if (ACPI_FAILURE(status)) {
327                                 result = -ENODEV;
328                                 goto end;
329                         }
330                 }
331         } else {
332                 if (device->power.states[state].flags.explicit_set) {
333                         status = acpi_evaluate_object(device->handle,
334                                                       object_name, NULL, NULL);
335                         if (ACPI_FAILURE(status)) {
336                                 result = -ENODEV;
337                                 goto end;
338                         }
339                 }
340                 if (device->power.flags.power_resources) {
341                         result = acpi_power_transition(device, state);
342                         if (result)
343                                 goto end;
344                 }
345         }
346
347       end:
348         if (result)
349                 printk(KERN_WARNING PREFIX
350                               "Device [%s] failed to transition to D%d\n",
351                               device->pnp.bus_id, state);
352         else {
353                 device->power.state = state;
354                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
355                                   "Device [%s] transitioned to D%d\n",
356                                   device->pnp.bus_id, state));
357         }
358
359         return result;
360 }
361
362 EXPORT_SYMBOL(acpi_bus_set_power);
363
364 bool acpi_bus_power_manageable(acpi_handle handle)
365 {
366         struct acpi_device *device;
367         int result;
368
369         result = acpi_bus_get_device(handle, &device);
370         return result ? false : device->flags.power_manageable;
371 }
372
373 EXPORT_SYMBOL(acpi_bus_power_manageable);
374
375 bool acpi_bus_can_wakeup(acpi_handle handle)
376 {
377         struct acpi_device *device;
378         int result;
379
380         result = acpi_bus_get_device(handle, &device);
381         return result ? false : device->wakeup.flags.valid;
382 }
383
384 EXPORT_SYMBOL(acpi_bus_can_wakeup);
385
386 static void acpi_print_osc_error(acpi_handle handle,
387         struct acpi_osc_context *context, char *error)
388 {
389         struct acpi_buffer buffer = {ACPI_ALLOCATE_BUFFER};
390         int i;
391
392         if (ACPI_FAILURE(acpi_get_name(handle, ACPI_FULL_PATHNAME, &buffer)))
393                 printk(KERN_DEBUG "%s\n", error);
394         else {
395                 printk(KERN_DEBUG "%s:%s\n", (char *)buffer.pointer, error);
396                 kfree(buffer.pointer);
397         }
398         printk(KERN_DEBUG"_OSC request data:");
399         for (i = 0; i < context->cap.length; i += sizeof(u32))
400                 printk("%x ", *((u32 *)(context->cap.pointer + i)));
401         printk("\n");
402 }
403
404 static u8 hex_val(unsigned char c)
405 {
406         return isdigit(c) ? c - '0' : toupper(c) - 'A' + 10;
407 }
408
409 static acpi_status acpi_str_to_uuid(char *str, u8 *uuid)
410 {
411         int i;
412         static int opc_map_to_uuid[16] = {6, 4, 2, 0, 11, 9, 16, 14, 19, 21,
413                 24, 26, 28, 30, 32, 34};
414
415         if (strlen(str) != 36)
416                 return AE_BAD_PARAMETER;
417         for (i = 0; i < 36; i++) {
418                 if (i == 8 || i == 13 || i == 18 || i == 23) {
419                         if (str[i] != '-')
420                                 return AE_BAD_PARAMETER;
421                 } else if (!isxdigit(str[i]))
422                         return AE_BAD_PARAMETER;
423         }
424         for (i = 0; i < 16; i++) {
425                 uuid[i] = hex_val(str[opc_map_to_uuid[i]]) << 4;
426                 uuid[i] |= hex_val(str[opc_map_to_uuid[i] + 1]);
427         }
428         return AE_OK;
429 }
430
431 acpi_status acpi_run_osc(acpi_handle handle, struct acpi_osc_context *context)
432 {
433         acpi_status status;
434         struct acpi_object_list input;
435         union acpi_object in_params[4];
436         union acpi_object *out_obj;
437         u8 uuid[16];
438         u32 errors;
439         struct acpi_buffer output = {ACPI_ALLOCATE_BUFFER, NULL};
440
441         if (!context)
442                 return AE_ERROR;
443         if (ACPI_FAILURE(acpi_str_to_uuid(context->uuid_str, uuid)))
444                 return AE_ERROR;
445         context->ret.length = ACPI_ALLOCATE_BUFFER;
446         context->ret.pointer = NULL;
447
448         /* Setting up input parameters */
449         input.count = 4;
450         input.pointer = in_params;
451         in_params[0].type               = ACPI_TYPE_BUFFER;
452         in_params[0].buffer.length      = 16;
453         in_params[0].buffer.pointer     = uuid;
454         in_params[1].type               = ACPI_TYPE_INTEGER;
455         in_params[1].integer.value      = context->rev;
456         in_params[2].type               = ACPI_TYPE_INTEGER;
457         in_params[2].integer.value      = context->cap.length/sizeof(u32);
458         in_params[3].type               = ACPI_TYPE_BUFFER;
459         in_params[3].buffer.length      = context->cap.length;
460         in_params[3].buffer.pointer     = context->cap.pointer;
461
462         status = acpi_evaluate_object(handle, "_OSC", &input, &output);
463         if (ACPI_FAILURE(status))
464                 return status;
465
466         if (!output.length)
467                 return AE_NULL_OBJECT;
468
469         out_obj = output.pointer;
470         if (out_obj->type != ACPI_TYPE_BUFFER
471                 || out_obj->buffer.length != context->cap.length) {
472                 acpi_print_osc_error(handle, context,
473                         "_OSC evaluation returned wrong type");
474                 status = AE_TYPE;
475                 goto out_kfree;
476         }
477         /* Need to ignore the bit0 in result code */
478         errors = *((u32 *)out_obj->buffer.pointer) & ~(1 << 0);
479         if (errors) {
480                 if (errors & OSC_REQUEST_ERROR)
481                         acpi_print_osc_error(handle, context,
482                                 "_OSC request failed");
483                 if (errors & OSC_INVALID_UUID_ERROR)
484                         acpi_print_osc_error(handle, context,
485                                 "_OSC invalid UUID");
486                 if (errors & OSC_INVALID_REVISION_ERROR)
487                         acpi_print_osc_error(handle, context,
488                                 "_OSC invalid revision");
489                 if (errors & OSC_CAPABILITIES_MASK_ERROR) {
490                         if (((u32 *)context->cap.pointer)[OSC_QUERY_TYPE]
491                             & OSC_QUERY_ENABLE)
492                                 goto out_success;
493                         status = AE_SUPPORT;
494                         goto out_kfree;
495                 }
496                 status = AE_ERROR;
497                 goto out_kfree;
498         }
499 out_success:
500         context->ret.length = out_obj->buffer.length;
501         context->ret.pointer = kmalloc(context->ret.length, GFP_KERNEL);
502         if (!context->ret.pointer) {
503                 status =  AE_NO_MEMORY;
504                 goto out_kfree;
505         }
506         memcpy(context->ret.pointer, out_obj->buffer.pointer,
507                 context->ret.length);
508         status =  AE_OK;
509
510 out_kfree:
511         kfree(output.pointer);
512         if (status != AE_OK)
513                 context->ret.pointer = NULL;
514         return status;
515 }
516 EXPORT_SYMBOL(acpi_run_osc);
517
518 static u8 sb_uuid_str[] = "0811B06E-4A27-44F9-8D60-3CBBC22E7B48";
519 static void acpi_bus_osc_support(void)
520 {
521         u32 capbuf[2];
522         struct acpi_osc_context context = {
523                 .uuid_str = sb_uuid_str,
524                 .rev = 1,
525                 .cap.length = 8,
526                 .cap.pointer = capbuf,
527         };
528         acpi_handle handle;
529
530         capbuf[OSC_QUERY_TYPE] = OSC_QUERY_ENABLE;
531         capbuf[OSC_SUPPORT_TYPE] = OSC_SB_PR3_SUPPORT; /* _PR3 is in use */
532 #if defined(CONFIG_ACPI_PROCESSOR_AGGREGATOR) ||\
533                         defined(CONFIG_ACPI_PROCESSOR_AGGREGATOR_MODULE)
534         capbuf[OSC_SUPPORT_TYPE] |= OSC_SB_PAD_SUPPORT;
535 #endif
536
537 #if defined(CONFIG_ACPI_PROCESSOR) || defined(CONFIG_ACPI_PROCESSOR_MODULE)
538         capbuf[OSC_SUPPORT_TYPE] |= OSC_SB_PPC_OST_SUPPORT;
539 #endif
540         if (ACPI_FAILURE(acpi_get_handle(NULL, "\\_SB", &handle)))
541                 return;
542         if (ACPI_SUCCESS(acpi_run_osc(handle, &context)))
543                 kfree(context.ret.pointer);
544         /* do we need to check the returned cap? Sounds no */
545 }
546
547 /* --------------------------------------------------------------------------
548                                 Event Management
549    -------------------------------------------------------------------------- */
550
551 #ifdef CONFIG_ACPI_PROC_EVENT
552 static DEFINE_SPINLOCK(acpi_bus_event_lock);
553
554 LIST_HEAD(acpi_bus_event_list);
555 DECLARE_WAIT_QUEUE_HEAD(acpi_bus_event_queue);
556
557 extern int event_is_open;
558
559 int acpi_bus_generate_proc_event4(const char *device_class, const char *bus_id, u8 type, int data)
560 {
561         struct acpi_bus_event *event;
562         unsigned long flags = 0;
563
564         /* drop event on the floor if no one's listening */
565         if (!event_is_open)
566                 return 0;
567
568         event = kzalloc(sizeof(struct acpi_bus_event), GFP_ATOMIC);
569         if (!event)
570                 return -ENOMEM;
571
572         strcpy(event->device_class, device_class);
573         strcpy(event->bus_id, bus_id);
574         event->type = type;
575         event->data = data;
576
577         spin_lock_irqsave(&acpi_bus_event_lock, flags);
578         list_add_tail(&event->node, &acpi_bus_event_list);
579         spin_unlock_irqrestore(&acpi_bus_event_lock, flags);
580
581         wake_up_interruptible(&acpi_bus_event_queue);
582
583         return 0;
584
585 }
586
587 EXPORT_SYMBOL_GPL(acpi_bus_generate_proc_event4);
588
589 int acpi_bus_generate_proc_event(struct acpi_device *device, u8 type, int data)
590 {
591         if (!device)
592                 return -EINVAL;
593         return acpi_bus_generate_proc_event4(device->pnp.device_class,
594                                              device->pnp.bus_id, type, data);
595 }
596
597 EXPORT_SYMBOL(acpi_bus_generate_proc_event);
598
599 int acpi_bus_receive_event(struct acpi_bus_event *event)
600 {
601         unsigned long flags = 0;
602         struct acpi_bus_event *entry = NULL;
603
604         DECLARE_WAITQUEUE(wait, current);
605
606
607         if (!event)
608                 return -EINVAL;
609
610         if (list_empty(&acpi_bus_event_list)) {
611
612                 set_current_state(TASK_INTERRUPTIBLE);
613                 add_wait_queue(&acpi_bus_event_queue, &wait);
614
615                 if (list_empty(&acpi_bus_event_list))
616                         schedule();
617
618                 remove_wait_queue(&acpi_bus_event_queue, &wait);
619                 set_current_state(TASK_RUNNING);
620
621                 if (signal_pending(current))
622                         return -ERESTARTSYS;
623         }
624
625         spin_lock_irqsave(&acpi_bus_event_lock, flags);
626         if (!list_empty(&acpi_bus_event_list)) {
627                 entry = list_entry(acpi_bus_event_list.next,
628                                    struct acpi_bus_event, node);
629                 list_del(&entry->node);
630         }
631         spin_unlock_irqrestore(&acpi_bus_event_lock, flags);
632
633         if (!entry)
634                 return -ENODEV;
635
636         memcpy(event, entry, sizeof(struct acpi_bus_event));
637
638         kfree(entry);
639
640         return 0;
641 }
642
643 #endif  /* CONFIG_ACPI_PROC_EVENT */
644
645 /* --------------------------------------------------------------------------
646                              Notification Handling
647    -------------------------------------------------------------------------- */
648
649 static void acpi_bus_check_device(acpi_handle handle)
650 {
651         struct acpi_device *device;
652         acpi_status status;
653         struct acpi_device_status old_status;
654
655         if (acpi_bus_get_device(handle, &device))
656                 return;
657         if (!device)
658                 return;
659
660         old_status = device->status;
661
662         /*
663          * Make sure this device's parent is present before we go about
664          * messing with the device.
665          */
666         if (device->parent && !device->parent->status.present) {
667                 device->status = device->parent->status;
668                 return;
669         }
670
671         status = acpi_bus_get_status(device);
672         if (ACPI_FAILURE(status))
673                 return;
674
675         if (STRUCT_TO_INT(old_status) == STRUCT_TO_INT(device->status))
676                 return;
677
678         /*
679          * Device Insertion/Removal
680          */
681         if ((device->status.present) && !(old_status.present)) {
682                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Device insertion detected\n"));
683                 /* TBD: Handle device insertion */
684         } else if (!(device->status.present) && (old_status.present)) {
685                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Device removal detected\n"));
686                 /* TBD: Handle device removal */
687         }
688 }
689
690 static void acpi_bus_check_scope(acpi_handle handle)
691 {
692         /* Status Change? */
693         acpi_bus_check_device(handle);
694
695         /*
696          * TBD: Enumerate child devices within this device's scope and
697          *       run acpi_bus_check_device()'s on them.
698          */
699 }
700
701 static BLOCKING_NOTIFIER_HEAD(acpi_bus_notify_list);
702 int register_acpi_bus_notifier(struct notifier_block *nb)
703 {
704         return blocking_notifier_chain_register(&acpi_bus_notify_list, nb);
705 }
706 EXPORT_SYMBOL_GPL(register_acpi_bus_notifier);
707
708 void unregister_acpi_bus_notifier(struct notifier_block *nb)
709 {
710         blocking_notifier_chain_unregister(&acpi_bus_notify_list, nb);
711 }
712 EXPORT_SYMBOL_GPL(unregister_acpi_bus_notifier);
713
714 /**
715  * acpi_bus_notify
716  * ---------------
717  * Callback for all 'system-level' device notifications (values 0x00-0x7F).
718  */
719 static void acpi_bus_notify(acpi_handle handle, u32 type, void *data)
720 {
721         struct acpi_device *device = NULL;
722         struct acpi_driver *driver;
723
724         ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Notification %#02x to handle %p\n",
725                           type, handle));
726
727         blocking_notifier_call_chain(&acpi_bus_notify_list,
728                 type, (void *)handle);
729
730         switch (type) {
731
732         case ACPI_NOTIFY_BUS_CHECK:
733                 acpi_bus_check_scope(handle);
734                 /*
735                  * TBD: We'll need to outsource certain events to non-ACPI
736                  *      drivers via the device manager (device.c).
737                  */
738                 break;
739
740         case ACPI_NOTIFY_DEVICE_CHECK:
741                 acpi_bus_check_device(handle);
742                 /*
743                  * TBD: We'll need to outsource certain events to non-ACPI
744                  *      drivers via the device manager (device.c).
745                  */
746                 break;
747
748         case ACPI_NOTIFY_DEVICE_WAKE:
749                 /* TBD */
750                 break;
751
752         case ACPI_NOTIFY_EJECT_REQUEST:
753                 /* TBD */
754                 break;
755
756         case ACPI_NOTIFY_DEVICE_CHECK_LIGHT:
757                 /* TBD: Exactly what does 'light' mean? */
758                 break;
759
760         case ACPI_NOTIFY_FREQUENCY_MISMATCH:
761                 /* TBD */
762                 break;
763
764         case ACPI_NOTIFY_BUS_MODE_MISMATCH:
765                 /* TBD */
766                 break;
767
768         case ACPI_NOTIFY_POWER_FAULT:
769                 /* TBD */
770                 break;
771
772         default:
773                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
774                                   "Received unknown/unsupported notification [%08x]\n",
775                                   type));
776                 break;
777         }
778
779         acpi_bus_get_device(handle, &device);
780         if (device) {
781                 driver = device->driver;
782                 if (driver && driver->ops.notify &&
783                     (driver->flags & ACPI_DRIVER_ALL_NOTIFY_EVENTS))
784                         driver->ops.notify(device, type);
785         }
786 }
787
788 /* --------------------------------------------------------------------------
789                              Initialization/Cleanup
790    -------------------------------------------------------------------------- */
791
792 static int __init acpi_bus_init_irq(void)
793 {
794         acpi_status status = AE_OK;
795         union acpi_object arg = { ACPI_TYPE_INTEGER };
796         struct acpi_object_list arg_list = { 1, &arg };
797         char *message = NULL;
798
799
800         /*
801          * Let the system know what interrupt model we are using by
802          * evaluating the \_PIC object, if exists.
803          */
804
805         switch (acpi_irq_model) {
806         case ACPI_IRQ_MODEL_PIC:
807                 message = "PIC";
808                 break;
809         case ACPI_IRQ_MODEL_IOAPIC:
810                 message = "IOAPIC";
811                 break;
812         case ACPI_IRQ_MODEL_IOSAPIC:
813                 message = "IOSAPIC";
814                 break;
815         case ACPI_IRQ_MODEL_PLATFORM:
816                 message = "platform specific model";
817                 break;
818         default:
819                 printk(KERN_WARNING PREFIX "Unknown interrupt routing model\n");
820                 return -ENODEV;
821         }
822
823         printk(KERN_INFO PREFIX "Using %s for interrupt routing\n", message);
824
825         arg.integer.value = acpi_irq_model;
826
827         status = acpi_evaluate_object(NULL, "\\_PIC", &arg_list, NULL);
828         if (ACPI_FAILURE(status) && (status != AE_NOT_FOUND)) {
829                 ACPI_EXCEPTION((AE_INFO, status, "Evaluating _PIC"));
830                 return -ENODEV;
831         }
832
833         return 0;
834 }
835
836 u8 acpi_gbl_permanent_mmap;
837
838
839 void __init acpi_early_init(void)
840 {
841         acpi_status status = AE_OK;
842
843         if (acpi_disabled)
844                 return;
845
846         printk(KERN_INFO PREFIX "Core revision %08x\n", ACPI_CA_VERSION);
847
848         /* enable workarounds, unless strict ACPI spec. compliance */
849         if (!acpi_strict)
850                 acpi_gbl_enable_interpreter_slack = TRUE;
851
852         acpi_gbl_permanent_mmap = 1;
853
854         /*
855          * If the machine falls into the DMI check table,
856          * DSDT will be copied to memory
857          */
858         dmi_check_system(dsdt_dmi_table);
859
860         status = acpi_reallocate_root_table();
861         if (ACPI_FAILURE(status)) {
862                 printk(KERN_ERR PREFIX
863                        "Unable to reallocate ACPI tables\n");
864                 goto error0;
865         }
866
867         status = acpi_initialize_subsystem();
868         if (ACPI_FAILURE(status)) {
869                 printk(KERN_ERR PREFIX
870                        "Unable to initialize the ACPI Interpreter\n");
871                 goto error0;
872         }
873
874         status = acpi_load_tables();
875         if (ACPI_FAILURE(status)) {
876                 printk(KERN_ERR PREFIX
877                        "Unable to load the System Description Tables\n");
878                 goto error0;
879         }
880
881 #ifdef CONFIG_X86
882         if (!acpi_ioapic) {
883                 /* compatible (0) means level (3) */
884                 if (!(acpi_sci_flags & ACPI_MADT_TRIGGER_MASK)) {
885                         acpi_sci_flags &= ~ACPI_MADT_TRIGGER_MASK;
886                         acpi_sci_flags |= ACPI_MADT_TRIGGER_LEVEL;
887                 }
888                 /* Set PIC-mode SCI trigger type */
889                 acpi_pic_sci_set_trigger(acpi_gbl_FADT.sci_interrupt,
890                                          (acpi_sci_flags & ACPI_MADT_TRIGGER_MASK) >> 2);
891         } else {
892                 /*
893                  * now that acpi_gbl_FADT is initialized,
894                  * update it with result from INT_SRC_OVR parsing
895                  */
896                 acpi_gbl_FADT.sci_interrupt = acpi_sci_override_gsi;
897         }
898 #endif
899
900         status =
901             acpi_enable_subsystem(~
902                                   (ACPI_NO_HARDWARE_INIT |
903                                    ACPI_NO_ACPI_ENABLE));
904         if (ACPI_FAILURE(status)) {
905                 printk(KERN_ERR PREFIX "Unable to enable ACPI\n");
906                 goto error0;
907         }
908
909         return;
910
911       error0:
912         disable_acpi();
913         return;
914 }
915
916 static int __init acpi_bus_init(void)
917 {
918         int result = 0;
919         acpi_status status = AE_OK;
920         extern acpi_status acpi_os_initialize1(void);
921
922         acpi_os_initialize1();
923
924         status =
925             acpi_enable_subsystem(ACPI_NO_HARDWARE_INIT | ACPI_NO_ACPI_ENABLE);
926         if (ACPI_FAILURE(status)) {
927                 printk(KERN_ERR PREFIX
928                        "Unable to start the ACPI Interpreter\n");
929                 goto error1;
930         }
931
932         /*
933          * ACPI 2.0 requires the EC driver to be loaded and work before
934          * the EC device is found in the namespace (i.e. before acpi_initialize_objects()
935          * is called).
936          *
937          * This is accomplished by looking for the ECDT table, and getting
938          * the EC parameters out of that.
939          */
940         status = acpi_ec_ecdt_probe();
941         /* Ignore result. Not having an ECDT is not fatal. */
942
943         acpi_bus_osc_support();
944
945         status = acpi_initialize_objects(ACPI_FULL_INITIALIZATION);
946         if (ACPI_FAILURE(status)) {
947                 printk(KERN_ERR PREFIX "Unable to initialize ACPI objects\n");
948                 goto error1;
949         }
950
951         acpi_early_processor_set_pdc();
952
953         /*
954          * Maybe EC region is required at bus_scan/acpi_get_devices. So it
955          * is necessary to enable it as early as possible.
956          */
957         acpi_boot_ec_enable();
958
959         printk(KERN_INFO PREFIX "Interpreter enabled\n");
960
961         /* Initialize sleep structures */
962         acpi_sleep_init();
963
964         /*
965          * Get the system interrupt model and evaluate \_PIC.
966          */
967         result = acpi_bus_init_irq();
968         if (result)
969                 goto error1;
970
971         /*
972          * Register the for all standard device notifications.
973          */
974         status =
975             acpi_install_notify_handler(ACPI_ROOT_OBJECT, ACPI_SYSTEM_NOTIFY,
976                                         &acpi_bus_notify, NULL);
977         if (ACPI_FAILURE(status)) {
978                 printk(KERN_ERR PREFIX
979                        "Unable to register for device notifications\n");
980                 goto error1;
981         }
982
983         /*
984          * Create the top ACPI proc directory
985          */
986         acpi_root_dir = proc_mkdir(ACPI_BUS_FILE_ROOT, NULL);
987
988         return 0;
989
990         /* Mimic structured exception handling */
991       error1:
992         acpi_terminate();
993         return -ENODEV;
994 }
995
996 struct kobject *acpi_kobj;
997
998 static int __init acpi_init(void)
999 {
1000         int result = 0;
1001
1002
1003         if (acpi_disabled) {
1004                 printk(KERN_INFO PREFIX "Interpreter disabled.\n");
1005                 return -ENODEV;
1006         }
1007
1008         acpi_kobj = kobject_create_and_add("acpi", firmware_kobj);
1009         if (!acpi_kobj) {
1010                 printk(KERN_WARNING "%s: kset create error\n", __func__);
1011                 acpi_kobj = NULL;
1012         }
1013
1014         init_acpi_device_notify();
1015         result = acpi_bus_init();
1016
1017         if (!result) {
1018                 pci_mmcfg_late_init();
1019                 if (!(pm_flags & PM_APM))
1020                         pm_flags |= PM_ACPI;
1021                 else {
1022                         printk(KERN_INFO PREFIX
1023                                "APM is already active, exiting\n");
1024                         disable_acpi();
1025                         result = -ENODEV;
1026                 }
1027         } else
1028                 disable_acpi();
1029
1030         if (acpi_disabled)
1031                 return result;
1032
1033         /*
1034          * If the laptop falls into the DMI check table, the power state check
1035          * will be disabled in the course of device power transistion.
1036          */
1037         dmi_check_system(power_nocheck_dmi_table);
1038
1039         acpi_scan_init();
1040         acpi_ec_init();
1041         acpi_power_init();
1042         acpi_system_init();
1043         acpi_debug_init();
1044         acpi_sleep_proc_init();
1045         acpi_wakeup_device_init();
1046         return result;
1047 }
1048
1049 subsys_initcall(acpi_init);