drivers: acpi: don't use own implementation of hex_to_bin()
[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 acpi_status acpi_str_to_uuid(char *str, u8 *uuid)
405 {
406         int i;
407         static int opc_map_to_uuid[16] = {6, 4, 2, 0, 11, 9, 16, 14, 19, 21,
408                 24, 26, 28, 30, 32, 34};
409
410         if (strlen(str) != 36)
411                 return AE_BAD_PARAMETER;
412         for (i = 0; i < 36; i++) {
413                 if (i == 8 || i == 13 || i == 18 || i == 23) {
414                         if (str[i] != '-')
415                                 return AE_BAD_PARAMETER;
416                 } else if (!isxdigit(str[i]))
417                         return AE_BAD_PARAMETER;
418         }
419         for (i = 0; i < 16; i++) {
420                 uuid[i] = hex_to_bin(str[opc_map_to_uuid[i]]) << 4;
421                 uuid[i] |= hex_to_bin(str[opc_map_to_uuid[i] + 1]);
422         }
423         return AE_OK;
424 }
425
426 acpi_status acpi_run_osc(acpi_handle handle, struct acpi_osc_context *context)
427 {
428         acpi_status status;
429         struct acpi_object_list input;
430         union acpi_object in_params[4];
431         union acpi_object *out_obj;
432         u8 uuid[16];
433         u32 errors;
434         struct acpi_buffer output = {ACPI_ALLOCATE_BUFFER, NULL};
435
436         if (!context)
437                 return AE_ERROR;
438         if (ACPI_FAILURE(acpi_str_to_uuid(context->uuid_str, uuid)))
439                 return AE_ERROR;
440         context->ret.length = ACPI_ALLOCATE_BUFFER;
441         context->ret.pointer = NULL;
442
443         /* Setting up input parameters */
444         input.count = 4;
445         input.pointer = in_params;
446         in_params[0].type               = ACPI_TYPE_BUFFER;
447         in_params[0].buffer.length      = 16;
448         in_params[0].buffer.pointer     = uuid;
449         in_params[1].type               = ACPI_TYPE_INTEGER;
450         in_params[1].integer.value      = context->rev;
451         in_params[2].type               = ACPI_TYPE_INTEGER;
452         in_params[2].integer.value      = context->cap.length/sizeof(u32);
453         in_params[3].type               = ACPI_TYPE_BUFFER;
454         in_params[3].buffer.length      = context->cap.length;
455         in_params[3].buffer.pointer     = context->cap.pointer;
456
457         status = acpi_evaluate_object(handle, "_OSC", &input, &output);
458         if (ACPI_FAILURE(status))
459                 return status;
460
461         if (!output.length)
462                 return AE_NULL_OBJECT;
463
464         out_obj = output.pointer;
465         if (out_obj->type != ACPI_TYPE_BUFFER
466                 || out_obj->buffer.length != context->cap.length) {
467                 acpi_print_osc_error(handle, context,
468                         "_OSC evaluation returned wrong type");
469                 status = AE_TYPE;
470                 goto out_kfree;
471         }
472         /* Need to ignore the bit0 in result code */
473         errors = *((u32 *)out_obj->buffer.pointer) & ~(1 << 0);
474         if (errors) {
475                 if (errors & OSC_REQUEST_ERROR)
476                         acpi_print_osc_error(handle, context,
477                                 "_OSC request failed");
478                 if (errors & OSC_INVALID_UUID_ERROR)
479                         acpi_print_osc_error(handle, context,
480                                 "_OSC invalid UUID");
481                 if (errors & OSC_INVALID_REVISION_ERROR)
482                         acpi_print_osc_error(handle, context,
483                                 "_OSC invalid revision");
484                 if (errors & OSC_CAPABILITIES_MASK_ERROR) {
485                         if (((u32 *)context->cap.pointer)[OSC_QUERY_TYPE]
486                             & OSC_QUERY_ENABLE)
487                                 goto out_success;
488                         status = AE_SUPPORT;
489                         goto out_kfree;
490                 }
491                 status = AE_ERROR;
492                 goto out_kfree;
493         }
494 out_success:
495         context->ret.length = out_obj->buffer.length;
496         context->ret.pointer = kmalloc(context->ret.length, GFP_KERNEL);
497         if (!context->ret.pointer) {
498                 status =  AE_NO_MEMORY;
499                 goto out_kfree;
500         }
501         memcpy(context->ret.pointer, out_obj->buffer.pointer,
502                 context->ret.length);
503         status =  AE_OK;
504
505 out_kfree:
506         kfree(output.pointer);
507         if (status != AE_OK)
508                 context->ret.pointer = NULL;
509         return status;
510 }
511 EXPORT_SYMBOL(acpi_run_osc);
512
513 static u8 sb_uuid_str[] = "0811B06E-4A27-44F9-8D60-3CBBC22E7B48";
514 static void acpi_bus_osc_support(void)
515 {
516         u32 capbuf[2];
517         struct acpi_osc_context context = {
518                 .uuid_str = sb_uuid_str,
519                 .rev = 1,
520                 .cap.length = 8,
521                 .cap.pointer = capbuf,
522         };
523         acpi_handle handle;
524
525         capbuf[OSC_QUERY_TYPE] = OSC_QUERY_ENABLE;
526         capbuf[OSC_SUPPORT_TYPE] = OSC_SB_PR3_SUPPORT; /* _PR3 is in use */
527 #if defined(CONFIG_ACPI_PROCESSOR_AGGREGATOR) ||\
528                         defined(CONFIG_ACPI_PROCESSOR_AGGREGATOR_MODULE)
529         capbuf[OSC_SUPPORT_TYPE] |= OSC_SB_PAD_SUPPORT;
530 #endif
531
532 #if defined(CONFIG_ACPI_PROCESSOR) || defined(CONFIG_ACPI_PROCESSOR_MODULE)
533         capbuf[OSC_SUPPORT_TYPE] |= OSC_SB_PPC_OST_SUPPORT;
534 #endif
535         if (ACPI_FAILURE(acpi_get_handle(NULL, "\\_SB", &handle)))
536                 return;
537         if (ACPI_SUCCESS(acpi_run_osc(handle, &context)))
538                 kfree(context.ret.pointer);
539         /* do we need to check the returned cap? Sounds no */
540 }
541
542 /* --------------------------------------------------------------------------
543                                 Event Management
544    -------------------------------------------------------------------------- */
545
546 #ifdef CONFIG_ACPI_PROC_EVENT
547 static DEFINE_SPINLOCK(acpi_bus_event_lock);
548
549 LIST_HEAD(acpi_bus_event_list);
550 DECLARE_WAIT_QUEUE_HEAD(acpi_bus_event_queue);
551
552 extern int event_is_open;
553
554 int acpi_bus_generate_proc_event4(const char *device_class, const char *bus_id, u8 type, int data)
555 {
556         struct acpi_bus_event *event;
557         unsigned long flags = 0;
558
559         /* drop event on the floor if no one's listening */
560         if (!event_is_open)
561                 return 0;
562
563         event = kzalloc(sizeof(struct acpi_bus_event), GFP_ATOMIC);
564         if (!event)
565                 return -ENOMEM;
566
567         strcpy(event->device_class, device_class);
568         strcpy(event->bus_id, bus_id);
569         event->type = type;
570         event->data = data;
571
572         spin_lock_irqsave(&acpi_bus_event_lock, flags);
573         list_add_tail(&event->node, &acpi_bus_event_list);
574         spin_unlock_irqrestore(&acpi_bus_event_lock, flags);
575
576         wake_up_interruptible(&acpi_bus_event_queue);
577
578         return 0;
579
580 }
581
582 EXPORT_SYMBOL_GPL(acpi_bus_generate_proc_event4);
583
584 int acpi_bus_generate_proc_event(struct acpi_device *device, u8 type, int data)
585 {
586         if (!device)
587                 return -EINVAL;
588         return acpi_bus_generate_proc_event4(device->pnp.device_class,
589                                              device->pnp.bus_id, type, data);
590 }
591
592 EXPORT_SYMBOL(acpi_bus_generate_proc_event);
593
594 int acpi_bus_receive_event(struct acpi_bus_event *event)
595 {
596         unsigned long flags = 0;
597         struct acpi_bus_event *entry = NULL;
598
599         DECLARE_WAITQUEUE(wait, current);
600
601
602         if (!event)
603                 return -EINVAL;
604
605         if (list_empty(&acpi_bus_event_list)) {
606
607                 set_current_state(TASK_INTERRUPTIBLE);
608                 add_wait_queue(&acpi_bus_event_queue, &wait);
609
610                 if (list_empty(&acpi_bus_event_list))
611                         schedule();
612
613                 remove_wait_queue(&acpi_bus_event_queue, &wait);
614                 set_current_state(TASK_RUNNING);
615
616                 if (signal_pending(current))
617                         return -ERESTARTSYS;
618         }
619
620         spin_lock_irqsave(&acpi_bus_event_lock, flags);
621         if (!list_empty(&acpi_bus_event_list)) {
622                 entry = list_entry(acpi_bus_event_list.next,
623                                    struct acpi_bus_event, node);
624                 list_del(&entry->node);
625         }
626         spin_unlock_irqrestore(&acpi_bus_event_lock, flags);
627
628         if (!entry)
629                 return -ENODEV;
630
631         memcpy(event, entry, sizeof(struct acpi_bus_event));
632
633         kfree(entry);
634
635         return 0;
636 }
637
638 #endif  /* CONFIG_ACPI_PROC_EVENT */
639
640 /* --------------------------------------------------------------------------
641                              Notification Handling
642    -------------------------------------------------------------------------- */
643
644 static void acpi_bus_check_device(acpi_handle handle)
645 {
646         struct acpi_device *device;
647         acpi_status status;
648         struct acpi_device_status old_status;
649
650         if (acpi_bus_get_device(handle, &device))
651                 return;
652         if (!device)
653                 return;
654
655         old_status = device->status;
656
657         /*
658          * Make sure this device's parent is present before we go about
659          * messing with the device.
660          */
661         if (device->parent && !device->parent->status.present) {
662                 device->status = device->parent->status;
663                 return;
664         }
665
666         status = acpi_bus_get_status(device);
667         if (ACPI_FAILURE(status))
668                 return;
669
670         if (STRUCT_TO_INT(old_status) == STRUCT_TO_INT(device->status))
671                 return;
672
673         /*
674          * Device Insertion/Removal
675          */
676         if ((device->status.present) && !(old_status.present)) {
677                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Device insertion detected\n"));
678                 /* TBD: Handle device insertion */
679         } else if (!(device->status.present) && (old_status.present)) {
680                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Device removal detected\n"));
681                 /* TBD: Handle device removal */
682         }
683 }
684
685 static void acpi_bus_check_scope(acpi_handle handle)
686 {
687         /* Status Change? */
688         acpi_bus_check_device(handle);
689
690         /*
691          * TBD: Enumerate child devices within this device's scope and
692          *       run acpi_bus_check_device()'s on them.
693          */
694 }
695
696 static BLOCKING_NOTIFIER_HEAD(acpi_bus_notify_list);
697 int register_acpi_bus_notifier(struct notifier_block *nb)
698 {
699         return blocking_notifier_chain_register(&acpi_bus_notify_list, nb);
700 }
701 EXPORT_SYMBOL_GPL(register_acpi_bus_notifier);
702
703 void unregister_acpi_bus_notifier(struct notifier_block *nb)
704 {
705         blocking_notifier_chain_unregister(&acpi_bus_notify_list, nb);
706 }
707 EXPORT_SYMBOL_GPL(unregister_acpi_bus_notifier);
708
709 /**
710  * acpi_bus_notify
711  * ---------------
712  * Callback for all 'system-level' device notifications (values 0x00-0x7F).
713  */
714 static void acpi_bus_notify(acpi_handle handle, u32 type, void *data)
715 {
716         struct acpi_device *device = NULL;
717         struct acpi_driver *driver;
718
719         ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Notification %#02x to handle %p\n",
720                           type, handle));
721
722         blocking_notifier_call_chain(&acpi_bus_notify_list,
723                 type, (void *)handle);
724
725         switch (type) {
726
727         case ACPI_NOTIFY_BUS_CHECK:
728                 acpi_bus_check_scope(handle);
729                 /*
730                  * TBD: We'll need to outsource certain events to non-ACPI
731                  *      drivers via the device manager (device.c).
732                  */
733                 break;
734
735         case ACPI_NOTIFY_DEVICE_CHECK:
736                 acpi_bus_check_device(handle);
737                 /*
738                  * TBD: We'll need to outsource certain events to non-ACPI
739                  *      drivers via the device manager (device.c).
740                  */
741                 break;
742
743         case ACPI_NOTIFY_DEVICE_WAKE:
744                 /* TBD */
745                 break;
746
747         case ACPI_NOTIFY_EJECT_REQUEST:
748                 /* TBD */
749                 break;
750
751         case ACPI_NOTIFY_DEVICE_CHECK_LIGHT:
752                 /* TBD: Exactly what does 'light' mean? */
753                 break;
754
755         case ACPI_NOTIFY_FREQUENCY_MISMATCH:
756                 /* TBD */
757                 break;
758
759         case ACPI_NOTIFY_BUS_MODE_MISMATCH:
760                 /* TBD */
761                 break;
762
763         case ACPI_NOTIFY_POWER_FAULT:
764                 /* TBD */
765                 break;
766
767         default:
768                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
769                                   "Received unknown/unsupported notification [%08x]\n",
770                                   type));
771                 break;
772         }
773
774         acpi_bus_get_device(handle, &device);
775         if (device) {
776                 driver = device->driver;
777                 if (driver && driver->ops.notify &&
778                     (driver->flags & ACPI_DRIVER_ALL_NOTIFY_EVENTS))
779                         driver->ops.notify(device, type);
780         }
781 }
782
783 /* --------------------------------------------------------------------------
784                              Initialization/Cleanup
785    -------------------------------------------------------------------------- */
786
787 static int __init acpi_bus_init_irq(void)
788 {
789         acpi_status status = AE_OK;
790         union acpi_object arg = { ACPI_TYPE_INTEGER };
791         struct acpi_object_list arg_list = { 1, &arg };
792         char *message = NULL;
793
794
795         /*
796          * Let the system know what interrupt model we are using by
797          * evaluating the \_PIC object, if exists.
798          */
799
800         switch (acpi_irq_model) {
801         case ACPI_IRQ_MODEL_PIC:
802                 message = "PIC";
803                 break;
804         case ACPI_IRQ_MODEL_IOAPIC:
805                 message = "IOAPIC";
806                 break;
807         case ACPI_IRQ_MODEL_IOSAPIC:
808                 message = "IOSAPIC";
809                 break;
810         case ACPI_IRQ_MODEL_PLATFORM:
811                 message = "platform specific model";
812                 break;
813         default:
814                 printk(KERN_WARNING PREFIX "Unknown interrupt routing model\n");
815                 return -ENODEV;
816         }
817
818         printk(KERN_INFO PREFIX "Using %s for interrupt routing\n", message);
819
820         arg.integer.value = acpi_irq_model;
821
822         status = acpi_evaluate_object(NULL, "\\_PIC", &arg_list, NULL);
823         if (ACPI_FAILURE(status) && (status != AE_NOT_FOUND)) {
824                 ACPI_EXCEPTION((AE_INFO, status, "Evaluating _PIC"));
825                 return -ENODEV;
826         }
827
828         return 0;
829 }
830
831 u8 acpi_gbl_permanent_mmap;
832
833
834 void __init acpi_early_init(void)
835 {
836         acpi_status status = AE_OK;
837
838         if (acpi_disabled)
839                 return;
840
841         printk(KERN_INFO PREFIX "Core revision %08x\n", ACPI_CA_VERSION);
842
843         /* enable workarounds, unless strict ACPI spec. compliance */
844         if (!acpi_strict)
845                 acpi_gbl_enable_interpreter_slack = TRUE;
846
847         acpi_gbl_permanent_mmap = 1;
848
849         /*
850          * If the machine falls into the DMI check table,
851          * DSDT will be copied to memory
852          */
853         dmi_check_system(dsdt_dmi_table);
854
855         status = acpi_reallocate_root_table();
856         if (ACPI_FAILURE(status)) {
857                 printk(KERN_ERR PREFIX
858                        "Unable to reallocate ACPI tables\n");
859                 goto error0;
860         }
861
862         status = acpi_initialize_subsystem();
863         if (ACPI_FAILURE(status)) {
864                 printk(KERN_ERR PREFIX
865                        "Unable to initialize the ACPI Interpreter\n");
866                 goto error0;
867         }
868
869         status = acpi_load_tables();
870         if (ACPI_FAILURE(status)) {
871                 printk(KERN_ERR PREFIX
872                        "Unable to load the System Description Tables\n");
873                 goto error0;
874         }
875
876 #ifdef CONFIG_X86
877         if (!acpi_ioapic) {
878                 /* compatible (0) means level (3) */
879                 if (!(acpi_sci_flags & ACPI_MADT_TRIGGER_MASK)) {
880                         acpi_sci_flags &= ~ACPI_MADT_TRIGGER_MASK;
881                         acpi_sci_flags |= ACPI_MADT_TRIGGER_LEVEL;
882                 }
883                 /* Set PIC-mode SCI trigger type */
884                 acpi_pic_sci_set_trigger(acpi_gbl_FADT.sci_interrupt,
885                                          (acpi_sci_flags & ACPI_MADT_TRIGGER_MASK) >> 2);
886         } else {
887                 /*
888                  * now that acpi_gbl_FADT is initialized,
889                  * update it with result from INT_SRC_OVR parsing
890                  */
891                 acpi_gbl_FADT.sci_interrupt = acpi_sci_override_gsi;
892         }
893 #endif
894
895         status =
896             acpi_enable_subsystem(~
897                                   (ACPI_NO_HARDWARE_INIT |
898                                    ACPI_NO_ACPI_ENABLE));
899         if (ACPI_FAILURE(status)) {
900                 printk(KERN_ERR PREFIX "Unable to enable ACPI\n");
901                 goto error0;
902         }
903
904         return;
905
906       error0:
907         disable_acpi();
908         return;
909 }
910
911 static int __init acpi_bus_init(void)
912 {
913         int result = 0;
914         acpi_status status = AE_OK;
915         extern acpi_status acpi_os_initialize1(void);
916
917         acpi_os_initialize1();
918
919         status =
920             acpi_enable_subsystem(ACPI_NO_HARDWARE_INIT | ACPI_NO_ACPI_ENABLE);
921         if (ACPI_FAILURE(status)) {
922                 printk(KERN_ERR PREFIX
923                        "Unable to start the ACPI Interpreter\n");
924                 goto error1;
925         }
926
927         /*
928          * ACPI 2.0 requires the EC driver to be loaded and work before
929          * the EC device is found in the namespace (i.e. before acpi_initialize_objects()
930          * is called).
931          *
932          * This is accomplished by looking for the ECDT table, and getting
933          * the EC parameters out of that.
934          */
935         status = acpi_ec_ecdt_probe();
936         /* Ignore result. Not having an ECDT is not fatal. */
937
938         acpi_bus_osc_support();
939
940         status = acpi_initialize_objects(ACPI_FULL_INITIALIZATION);
941         if (ACPI_FAILURE(status)) {
942                 printk(KERN_ERR PREFIX "Unable to initialize ACPI objects\n");
943                 goto error1;
944         }
945
946         acpi_early_processor_set_pdc();
947
948         /*
949          * Maybe EC region is required at bus_scan/acpi_get_devices. So it
950          * is necessary to enable it as early as possible.
951          */
952         acpi_boot_ec_enable();
953
954         printk(KERN_INFO PREFIX "Interpreter enabled\n");
955
956         /* Initialize sleep structures */
957         acpi_sleep_init();
958
959         /*
960          * Get the system interrupt model and evaluate \_PIC.
961          */
962         result = acpi_bus_init_irq();
963         if (result)
964                 goto error1;
965
966         /*
967          * Register the for all standard device notifications.
968          */
969         status =
970             acpi_install_notify_handler(ACPI_ROOT_OBJECT, ACPI_SYSTEM_NOTIFY,
971                                         &acpi_bus_notify, NULL);
972         if (ACPI_FAILURE(status)) {
973                 printk(KERN_ERR PREFIX
974                        "Unable to register for device notifications\n");
975                 goto error1;
976         }
977
978         /*
979          * Create the top ACPI proc directory
980          */
981         acpi_root_dir = proc_mkdir(ACPI_BUS_FILE_ROOT, NULL);
982
983         return 0;
984
985         /* Mimic structured exception handling */
986       error1:
987         acpi_terminate();
988         return -ENODEV;
989 }
990
991 struct kobject *acpi_kobj;
992
993 static int __init acpi_init(void)
994 {
995         int result = 0;
996
997
998         if (acpi_disabled) {
999                 printk(KERN_INFO PREFIX "Interpreter disabled.\n");
1000                 return -ENODEV;
1001         }
1002
1003         acpi_kobj = kobject_create_and_add("acpi", firmware_kobj);
1004         if (!acpi_kobj) {
1005                 printk(KERN_WARNING "%s: kset create error\n", __func__);
1006                 acpi_kobj = NULL;
1007         }
1008
1009         init_acpi_device_notify();
1010         result = acpi_bus_init();
1011
1012         if (!result) {
1013                 pci_mmcfg_late_init();
1014                 if (!(pm_flags & PM_APM))
1015                         pm_flags |= PM_ACPI;
1016                 else {
1017                         printk(KERN_INFO PREFIX
1018                                "APM is already active, exiting\n");
1019                         disable_acpi();
1020                         result = -ENODEV;
1021                 }
1022         } else
1023                 disable_acpi();
1024
1025         if (acpi_disabled)
1026                 return result;
1027
1028         /*
1029          * If the laptop falls into the DMI check table, the power state check
1030          * will be disabled in the course of device power transistion.
1031          */
1032         dmi_check_system(power_nocheck_dmi_table);
1033
1034         acpi_scan_init();
1035         acpi_ec_init();
1036         acpi_power_init();
1037         acpi_system_init();
1038         acpi_debug_init();
1039         acpi_sleep_proc_init();
1040         acpi_wakeup_device_init();
1041         return result;
1042 }
1043
1044 subsys_initcall(acpi_init);