Pull bugzilla-9494 into release branch
[linux-2.6] / drivers / acpi / scan.c
1 /*
2  * scan.c - support for transforming the ACPI namespace into individual objects
3  */
4
5 #include <linux/module.h>
6 #include <linux/init.h>
7 #include <linux/kernel.h>
8 #include <linux/acpi.h>
9
10 #include <acpi/acpi_drivers.h>
11 #include <acpi/acinterp.h>      /* for acpi_ex_eisa_id_to_string() */
12
13 #define _COMPONENT              ACPI_BUS_COMPONENT
14 ACPI_MODULE_NAME("scan");
15 #define STRUCT_TO_INT(s)        (*((int*)&s))
16 extern struct acpi_device *acpi_root;
17
18 #define ACPI_BUS_CLASS                  "system_bus"
19 #define ACPI_BUS_HID                    "LNXSYBUS"
20 #define ACPI_BUS_DEVICE_NAME            "System Bus"
21
22 static LIST_HEAD(acpi_device_list);
23 static LIST_HEAD(acpi_bus_id_list);
24 DEFINE_SPINLOCK(acpi_device_lock);
25 LIST_HEAD(acpi_wakeup_device_list);
26
27 struct acpi_device_bus_id{
28         char bus_id[15];
29         unsigned int instance_no;
30         struct list_head node;
31 };
32
33 /*
34  * Creates hid/cid(s) string needed for modalias and uevent
35  * e.g. on a device with hid:IBM0001 and cid:ACPI0001 you get:
36  * char *modalias: "acpi:IBM0001:ACPI0001"
37 */
38 static int create_modalias(struct acpi_device *acpi_dev, char *modalias,
39                            int size)
40 {
41         int len;
42
43         if (!acpi_dev->flags.hardware_id)
44                 return -ENODEV;
45
46         len = snprintf(modalias, size, "acpi:%s:",
47                        acpi_dev->pnp.hardware_id);
48         if (len < 0 || len >= size)
49                 return -EINVAL;
50         size -= len;
51
52         if (acpi_dev->flags.compatible_ids) {
53                 struct acpi_compatible_id_list *cid_list;
54                 int i;
55                 int count;
56
57                 cid_list = acpi_dev->pnp.cid_list;
58                 for (i = 0; i < cid_list->count; i++) {
59                         count = snprintf(&modalias[len], size, "%s:",
60                                          cid_list->id[i].value);
61                         if (count < 0 || count >= size) {
62                                 printk(KERN_ERR "acpi: %s cid[%i] exceeds event buffer size",
63                                        acpi_dev->pnp.device_name, i);
64                                 break;
65                         }
66                         len += count;
67                         size -= count;
68                 }
69         }
70
71         modalias[len] = '\0';
72         return len;
73 }
74
75 static ssize_t
76 acpi_device_modalias_show(struct device *dev, struct device_attribute *attr, char *buf) {
77         struct acpi_device *acpi_dev = to_acpi_device(dev);
78         int len;
79
80         /* Device has no HID and no CID or string is >1024 */
81         len = create_modalias(acpi_dev, buf, 1024);
82         if (len <= 0)
83                 return 0;
84         buf[len++] = '\n';
85         return len;
86 }
87 static DEVICE_ATTR(modalias, 0444, acpi_device_modalias_show, NULL);
88
89 static int acpi_eject_operation(acpi_handle handle, int lockable)
90 {
91         struct acpi_object_list arg_list;
92         union acpi_object arg;
93         acpi_status status = AE_OK;
94
95         /*
96          * TBD: evaluate _PS3?
97          */
98
99         if (lockable) {
100                 arg_list.count = 1;
101                 arg_list.pointer = &arg;
102                 arg.type = ACPI_TYPE_INTEGER;
103                 arg.integer.value = 0;
104                 acpi_evaluate_object(handle, "_LCK", &arg_list, NULL);
105         }
106
107         arg_list.count = 1;
108         arg_list.pointer = &arg;
109         arg.type = ACPI_TYPE_INTEGER;
110         arg.integer.value = 1;
111
112         /*
113          * TBD: _EJD support.
114          */
115
116         status = acpi_evaluate_object(handle, "_EJ0", &arg_list, NULL);
117         if (ACPI_FAILURE(status)) {
118                 return (-ENODEV);
119         }
120
121         return (0);
122 }
123
124 static ssize_t
125 acpi_eject_store(struct device *d, struct device_attribute *attr,
126                 const char *buf, size_t count)
127 {
128         int result;
129         int ret = count;
130         int islockable;
131         acpi_status status;
132         acpi_handle handle;
133         acpi_object_type type = 0;
134         struct acpi_device *acpi_device = to_acpi_device(d);
135
136         if ((!count) || (buf[0] != '1')) {
137                 return -EINVAL;
138         }
139 #ifndef FORCE_EJECT
140         if (acpi_device->driver == NULL) {
141                 ret = -ENODEV;
142                 goto err;
143         }
144 #endif
145         status = acpi_get_type(acpi_device->handle, &type);
146         if (ACPI_FAILURE(status) || (!acpi_device->flags.ejectable)) {
147                 ret = -ENODEV;
148                 goto err;
149         }
150
151         islockable = acpi_device->flags.lockable;
152         handle = acpi_device->handle;
153
154         result = acpi_bus_trim(acpi_device, 1);
155
156         if (!result)
157                 result = acpi_eject_operation(handle, islockable);
158
159         if (result) {
160                 ret = -EBUSY;
161         }
162       err:
163         return ret;
164 }
165
166 static DEVICE_ATTR(eject, 0200, NULL, acpi_eject_store);
167
168 static ssize_t
169 acpi_device_hid_show(struct device *dev, struct device_attribute *attr, char *buf) {
170         struct acpi_device *acpi_dev = to_acpi_device(dev);
171
172         return sprintf(buf, "%s\n", acpi_dev->pnp.hardware_id);
173 }
174 static DEVICE_ATTR(hid, 0444, acpi_device_hid_show, NULL);
175
176 static ssize_t
177 acpi_device_path_show(struct device *dev, struct device_attribute *attr, char *buf) {
178         struct acpi_device *acpi_dev = to_acpi_device(dev);
179         struct acpi_buffer path = {ACPI_ALLOCATE_BUFFER, NULL};
180         int result;
181
182         result = acpi_get_name(acpi_dev->handle, ACPI_FULL_PATHNAME, &path);
183         if(result)
184                 goto end;
185
186         result = sprintf(buf, "%s\n", (char*)path.pointer);
187         kfree(path.pointer);
188   end:
189         return result;
190 }
191 static DEVICE_ATTR(path, 0444, acpi_device_path_show, NULL);
192
193 static int acpi_device_setup_files(struct acpi_device *dev)
194 {
195         acpi_status status;
196         acpi_handle temp;
197         int result = 0;
198
199         /*
200          * Devices gotten from FADT don't have a "path" attribute
201          */
202         if(dev->handle) {
203                 result = device_create_file(&dev->dev, &dev_attr_path);
204                 if(result)
205                         goto end;
206         }
207
208         if(dev->flags.hardware_id) {
209                 result = device_create_file(&dev->dev, &dev_attr_hid);
210                 if(result)
211                         goto end;
212         }
213
214         if (dev->flags.hardware_id || dev->flags.compatible_ids){
215                 result = device_create_file(&dev->dev, &dev_attr_modalias);
216                 if(result)
217                         goto end;
218         }
219
220         /*
221          * If device has _EJ0, 'eject' file is created that is used to trigger
222          * hot-removal function from userland.
223          */
224         status = acpi_get_handle(dev->handle, "_EJ0", &temp);
225         if (ACPI_SUCCESS(status))
226                 result = device_create_file(&dev->dev, &dev_attr_eject);
227   end:
228         return result;
229 }
230
231 static void acpi_device_remove_files(struct acpi_device *dev)
232 {
233         acpi_status status;
234         acpi_handle temp;
235
236         /*
237          * If device has _EJ0, 'eject' file is created that is used to trigger
238          * hot-removal function from userland.
239          */
240         status = acpi_get_handle(dev->handle, "_EJ0", &temp);
241         if (ACPI_SUCCESS(status))
242                 device_remove_file(&dev->dev, &dev_attr_eject);
243
244         if (dev->flags.hardware_id || dev->flags.compatible_ids)
245                 device_remove_file(&dev->dev, &dev_attr_modalias);
246
247         if(dev->flags.hardware_id)
248                 device_remove_file(&dev->dev, &dev_attr_hid);
249         if(dev->handle)
250                 device_remove_file(&dev->dev, &dev_attr_path);
251 }
252 /* --------------------------------------------------------------------------
253                         ACPI Bus operations
254    -------------------------------------------------------------------------- */
255
256 int acpi_match_device_ids(struct acpi_device *device,
257                           const struct acpi_device_id *ids)
258 {
259         const struct acpi_device_id *id;
260
261         if (device->flags.hardware_id) {
262                 for (id = ids; id->id[0]; id++) {
263                         if (!strcmp((char*)id->id, device->pnp.hardware_id))
264                                 return 0;
265                 }
266         }
267
268         if (device->flags.compatible_ids) {
269                 struct acpi_compatible_id_list *cid_list = device->pnp.cid_list;
270                 int i;
271
272                 for (id = ids; id->id[0]; id++) {
273                         /* compare multiple _CID entries against driver ids */
274                         for (i = 0; i < cid_list->count; i++) {
275                                 if (!strcmp((char*)id->id,
276                                             cid_list->id[i].value))
277                                         return 0;
278                         }
279                 }
280         }
281
282         return -ENOENT;
283 }
284 EXPORT_SYMBOL(acpi_match_device_ids);
285
286 static void acpi_device_release(struct device *dev)
287 {
288         struct acpi_device *acpi_dev = to_acpi_device(dev);
289
290         kfree(acpi_dev->pnp.cid_list);
291         kfree(acpi_dev);
292 }
293
294 static int acpi_device_suspend(struct device *dev, pm_message_t state)
295 {
296         struct acpi_device *acpi_dev = to_acpi_device(dev);
297         struct acpi_driver *acpi_drv = acpi_dev->driver;
298
299         if (acpi_drv && acpi_drv->ops.suspend)
300                 return acpi_drv->ops.suspend(acpi_dev, state);
301         return 0;
302 }
303
304 static int acpi_device_resume(struct device *dev)
305 {
306         struct acpi_device *acpi_dev = to_acpi_device(dev);
307         struct acpi_driver *acpi_drv = acpi_dev->driver;
308
309         if (acpi_drv && acpi_drv->ops.resume)
310                 return acpi_drv->ops.resume(acpi_dev);
311         return 0;
312 }
313
314 static int acpi_bus_match(struct device *dev, struct device_driver *drv)
315 {
316         struct acpi_device *acpi_dev = to_acpi_device(dev);
317         struct acpi_driver *acpi_drv = to_acpi_driver(drv);
318
319         return !acpi_match_device_ids(acpi_dev, acpi_drv->ids);
320 }
321
322 static int acpi_device_uevent(struct device *dev, struct kobj_uevent_env *env)
323 {
324         struct acpi_device *acpi_dev = to_acpi_device(dev);
325         int len;
326
327         if (add_uevent_var(env, "MODALIAS="))
328                 return -ENOMEM;
329         len = create_modalias(acpi_dev, &env->buf[env->buflen - 1],
330                               sizeof(env->buf) - env->buflen);
331         if (len >= (sizeof(env->buf) - env->buflen))
332                 return -ENOMEM;
333         env->buflen += len;
334         return 0;
335 }
336
337 static int acpi_bus_driver_init(struct acpi_device *, struct acpi_driver *);
338 static int acpi_start_single_object(struct acpi_device *);
339 static int acpi_device_probe(struct device * dev)
340 {
341         struct acpi_device *acpi_dev = to_acpi_device(dev);
342         struct acpi_driver *acpi_drv = to_acpi_driver(dev->driver);
343         int ret;
344
345         ret = acpi_bus_driver_init(acpi_dev, acpi_drv);
346         if (!ret) {
347                 if (acpi_dev->bus_ops.acpi_op_start)
348                         acpi_start_single_object(acpi_dev);
349                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
350                         "Found driver [%s] for device [%s]\n",
351                         acpi_drv->name, acpi_dev->pnp.bus_id));
352                 get_device(dev);
353         }
354         return ret;
355 }
356
357 static int acpi_device_remove(struct device * dev)
358 {
359         struct acpi_device *acpi_dev = to_acpi_device(dev);
360         struct acpi_driver *acpi_drv = acpi_dev->driver;
361
362         if (acpi_drv) {
363                 if (acpi_drv->ops.stop)
364                         acpi_drv->ops.stop(acpi_dev, acpi_dev->removal_type);
365                 if (acpi_drv->ops.remove)
366                         acpi_drv->ops.remove(acpi_dev, acpi_dev->removal_type);
367         }
368         acpi_dev->driver = NULL;
369         acpi_driver_data(dev) = NULL;
370
371         put_device(dev);
372         return 0;
373 }
374
375 static void acpi_device_shutdown(struct device *dev)
376 {
377         struct acpi_device *acpi_dev = to_acpi_device(dev);
378         struct acpi_driver *acpi_drv = acpi_dev->driver;
379
380         if (acpi_drv && acpi_drv->ops.shutdown)
381                 acpi_drv->ops.shutdown(acpi_dev);
382
383         return ;
384 }
385
386 struct bus_type acpi_bus_type = {
387         .name           = "acpi",
388         .suspend        = acpi_device_suspend,
389         .resume         = acpi_device_resume,
390         .shutdown       = acpi_device_shutdown,
391         .match          = acpi_bus_match,
392         .probe          = acpi_device_probe,
393         .remove         = acpi_device_remove,
394         .uevent         = acpi_device_uevent,
395 };
396
397 static int acpi_device_register(struct acpi_device *device,
398                                  struct acpi_device *parent)
399 {
400         int result;
401         struct acpi_device_bus_id *acpi_device_bus_id, *new_bus_id;
402         int found = 0;
403         /*
404          * Linkage
405          * -------
406          * Link this device to its parent and siblings.
407          */
408         INIT_LIST_HEAD(&device->children);
409         INIT_LIST_HEAD(&device->node);
410         INIT_LIST_HEAD(&device->g_list);
411         INIT_LIST_HEAD(&device->wakeup_list);
412
413         new_bus_id = kzalloc(sizeof(struct acpi_device_bus_id), GFP_KERNEL);
414         if (!new_bus_id) {
415                 printk(KERN_ERR PREFIX "Memory allocation error\n");
416                 return -ENOMEM;
417         }
418
419         spin_lock(&acpi_device_lock);
420         /*
421          * Find suitable bus_id and instance number in acpi_bus_id_list
422          * If failed, create one and link it into acpi_bus_id_list
423          */
424         list_for_each_entry(acpi_device_bus_id, &acpi_bus_id_list, node) {
425                 if(!strcmp(acpi_device_bus_id->bus_id, device->flags.hardware_id? device->pnp.hardware_id : "device")) {
426                         acpi_device_bus_id->instance_no ++;
427                         found = 1;
428                         kfree(new_bus_id);
429                         break;
430                 }
431         }
432         if(!found) {
433                 acpi_device_bus_id = new_bus_id;
434                 strcpy(acpi_device_bus_id->bus_id, device->flags.hardware_id ? device->pnp.hardware_id : "device");
435                 acpi_device_bus_id->instance_no = 0;
436                 list_add_tail(&acpi_device_bus_id->node, &acpi_bus_id_list);
437         }
438         sprintf(device->dev.bus_id, "%s:%02x", acpi_device_bus_id->bus_id, acpi_device_bus_id->instance_no);
439
440         if (device->parent) {
441                 list_add_tail(&device->node, &device->parent->children);
442                 list_add_tail(&device->g_list, &device->parent->g_list);
443         } else
444                 list_add_tail(&device->g_list, &acpi_device_list);
445         if (device->wakeup.flags.valid)
446                 list_add_tail(&device->wakeup_list, &acpi_wakeup_device_list);
447         spin_unlock(&acpi_device_lock);
448
449         if (device->parent)
450                 device->dev.parent = &parent->dev;
451         device->dev.bus = &acpi_bus_type;
452         device_initialize(&device->dev);
453         device->dev.release = &acpi_device_release;
454         result = device_add(&device->dev);
455         if(result) {
456                 printk("Error adding device %s", device->dev.bus_id);
457                 goto end;
458         }
459
460         result = acpi_device_setup_files(device);
461         if(result)
462                 ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "Error creating sysfs interface for device %s\n", device->dev.bus_id));
463
464         device->removal_type = ACPI_BUS_REMOVAL_NORMAL;
465         return 0;
466   end:
467         spin_lock(&acpi_device_lock);
468         if (device->parent) {
469                 list_del(&device->node);
470                 list_del(&device->g_list);
471         } else
472                 list_del(&device->g_list);
473         list_del(&device->wakeup_list);
474         spin_unlock(&acpi_device_lock);
475         return result;
476 }
477
478 static void acpi_device_unregister(struct acpi_device *device, int type)
479 {
480         spin_lock(&acpi_device_lock);
481         if (device->parent) {
482                 list_del(&device->node);
483                 list_del(&device->g_list);
484         } else
485                 list_del(&device->g_list);
486
487         list_del(&device->wakeup_list);
488         spin_unlock(&acpi_device_lock);
489
490         acpi_detach_data(device->handle, acpi_bus_data_handler);
491
492         acpi_device_remove_files(device);
493         device_unregister(&device->dev);
494 }
495
496 /* --------------------------------------------------------------------------
497                                  Driver Management
498    -------------------------------------------------------------------------- */
499 /**
500  * acpi_bus_driver_init - add a device to a driver
501  * @device: the device to add and initialize
502  * @driver: driver for the device
503  *
504  * Used to initialize a device via its device driver.  Called whenever a 
505  * driver is bound to a device.  Invokes the driver's add() ops.
506  */
507 static int
508 acpi_bus_driver_init(struct acpi_device *device, struct acpi_driver *driver)
509 {
510         int result = 0;
511
512
513         if (!device || !driver)
514                 return -EINVAL;
515
516         if (!driver->ops.add)
517                 return -ENOSYS;
518
519         result = driver->ops.add(device);
520         if (result) {
521                 device->driver = NULL;
522                 acpi_driver_data(device) = NULL;
523                 return result;
524         }
525
526         device->driver = driver;
527
528         /*
529          * TBD - Configuration Management: Assign resources to device based
530          * upon possible configuration and currently allocated resources.
531          */
532
533         ACPI_DEBUG_PRINT((ACPI_DB_INFO,
534                           "Driver successfully bound to device\n"));
535         return 0;
536 }
537
538 static int acpi_start_single_object(struct acpi_device *device)
539 {
540         int result = 0;
541         struct acpi_driver *driver;
542
543
544         if (!(driver = device->driver))
545                 return 0;
546
547         if (driver->ops.start) {
548                 result = driver->ops.start(device);
549                 if (result && driver->ops.remove)
550                         driver->ops.remove(device, ACPI_BUS_REMOVAL_NORMAL);
551         }
552
553         return result;
554 }
555
556 /**
557  * acpi_bus_register_driver - register a driver with the ACPI bus
558  * @driver: driver being registered
559  *
560  * Registers a driver with the ACPI bus.  Searches the namespace for all
561  * devices that match the driver's criteria and binds.  Returns zero for
562  * success or a negative error status for failure.
563  */
564 int acpi_bus_register_driver(struct acpi_driver *driver)
565 {
566         int ret;
567
568         if (acpi_disabled)
569                 return -ENODEV;
570         driver->drv.name = driver->name;
571         driver->drv.bus = &acpi_bus_type;
572         driver->drv.owner = driver->owner;
573
574         ret = driver_register(&driver->drv);
575         return ret;
576 }
577
578 EXPORT_SYMBOL(acpi_bus_register_driver);
579
580 /**
581  * acpi_bus_unregister_driver - unregisters a driver with the APIC bus
582  * @driver: driver to unregister
583  *
584  * Unregisters a driver with the ACPI bus.  Searches the namespace for all
585  * devices that match the driver's criteria and unbinds.
586  */
587 void acpi_bus_unregister_driver(struct acpi_driver *driver)
588 {
589         driver_unregister(&driver->drv);
590 }
591
592 EXPORT_SYMBOL(acpi_bus_unregister_driver);
593
594 /* --------------------------------------------------------------------------
595                                  Device Enumeration
596    -------------------------------------------------------------------------- */
597 acpi_status
598 acpi_bus_get_ejd(acpi_handle handle, acpi_handle *ejd)
599 {
600         acpi_status status;
601         acpi_handle tmp;
602         struct acpi_buffer buffer = {ACPI_ALLOCATE_BUFFER, NULL};
603         union acpi_object *obj;
604
605         status = acpi_get_handle(handle, "_EJD", &tmp);
606         if (ACPI_FAILURE(status))
607                 return status;
608
609         status = acpi_evaluate_object(handle, "_EJD", NULL, &buffer);
610         if (ACPI_SUCCESS(status)) {
611                 obj = buffer.pointer;
612                 status = acpi_get_handle(NULL, obj->string.pointer, ejd);
613                 kfree(buffer.pointer);
614         }
615         return status;
616 }
617 EXPORT_SYMBOL_GPL(acpi_bus_get_ejd);
618
619 void acpi_bus_data_handler(acpi_handle handle, u32 function, void *context)
620 {
621
622         /* TBD */
623
624         return;
625 }
626
627 static int acpi_bus_get_perf_flags(struct acpi_device *device)
628 {
629         device->performance.state = ACPI_STATE_UNKNOWN;
630         return 0;
631 }
632
633 static acpi_status
634 acpi_bus_extract_wakeup_device_power_package(struct acpi_device *device,
635                                              union acpi_object *package)
636 {
637         int i = 0;
638         union acpi_object *element = NULL;
639
640         if (!device || !package || (package->package.count < 2))
641                 return AE_BAD_PARAMETER;
642
643         element = &(package->package.elements[0]);
644         if (!element)
645                 return AE_BAD_PARAMETER;
646         if (element->type == ACPI_TYPE_PACKAGE) {
647                 if ((element->package.count < 2) ||
648                     (element->package.elements[0].type !=
649                      ACPI_TYPE_LOCAL_REFERENCE)
650                     || (element->package.elements[1].type != ACPI_TYPE_INTEGER))
651                         return AE_BAD_DATA;
652                 device->wakeup.gpe_device =
653                     element->package.elements[0].reference.handle;
654                 device->wakeup.gpe_number =
655                     (u32) element->package.elements[1].integer.value;
656         } else if (element->type == ACPI_TYPE_INTEGER) {
657                 device->wakeup.gpe_number = element->integer.value;
658         } else
659                 return AE_BAD_DATA;
660
661         element = &(package->package.elements[1]);
662         if (element->type != ACPI_TYPE_INTEGER) {
663                 return AE_BAD_DATA;
664         }
665         device->wakeup.sleep_state = element->integer.value;
666
667         if ((package->package.count - 2) > ACPI_MAX_HANDLES) {
668                 return AE_NO_MEMORY;
669         }
670         device->wakeup.resources.count = package->package.count - 2;
671         for (i = 0; i < device->wakeup.resources.count; i++) {
672                 element = &(package->package.elements[i + 2]);
673                 if (element->type != ACPI_TYPE_ANY) {
674                         return AE_BAD_DATA;
675                 }
676
677                 device->wakeup.resources.handles[i] = element->reference.handle;
678         }
679
680         return AE_OK;
681 }
682
683 static int acpi_bus_get_wakeup_device_flags(struct acpi_device *device)
684 {
685         acpi_status status = 0;
686         struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
687         union acpi_object *package = NULL;
688
689         struct acpi_device_id button_device_ids[] = {
690                 {"PNP0C0D", 0},
691                 {"PNP0C0C", 0},
692                 {"PNP0C0E", 0},
693                 {"", 0},
694         };
695
696
697         /* _PRW */
698         status = acpi_evaluate_object(device->handle, "_PRW", NULL, &buffer);
699         if (ACPI_FAILURE(status)) {
700                 ACPI_EXCEPTION((AE_INFO, status, "Evaluating _PRW"));
701                 goto end;
702         }
703
704         package = (union acpi_object *)buffer.pointer;
705         status = acpi_bus_extract_wakeup_device_power_package(device, package);
706         if (ACPI_FAILURE(status)) {
707                 ACPI_EXCEPTION((AE_INFO, status, "Extracting _PRW package"));
708                 goto end;
709         }
710
711         kfree(buffer.pointer);
712
713         device->wakeup.flags.valid = 1;
714         /* Power button, Lid switch always enable wakeup */
715         if (!acpi_match_device_ids(device, button_device_ids))
716                 device->wakeup.flags.run_wake = 1;
717
718       end:
719         if (ACPI_FAILURE(status))
720                 device->flags.wake_capable = 0;
721         return 0;
722 }
723
724 static int acpi_bus_get_power_flags(struct acpi_device *device)
725 {
726         acpi_status status = 0;
727         acpi_handle handle = NULL;
728         u32 i = 0;
729
730
731         /*
732          * Power Management Flags
733          */
734         status = acpi_get_handle(device->handle, "_PSC", &handle);
735         if (ACPI_SUCCESS(status))
736                 device->power.flags.explicit_get = 1;
737         status = acpi_get_handle(device->handle, "_IRC", &handle);
738         if (ACPI_SUCCESS(status))
739                 device->power.flags.inrush_current = 1;
740
741         /*
742          * Enumerate supported power management states
743          */
744         for (i = ACPI_STATE_D0; i <= ACPI_STATE_D3; i++) {
745                 struct acpi_device_power_state *ps = &device->power.states[i];
746                 char object_name[5] = { '_', 'P', 'R', '0' + i, '\0' };
747
748                 /* Evaluate "_PRx" to se if power resources are referenced */
749                 acpi_evaluate_reference(device->handle, object_name, NULL,
750                                         &ps->resources);
751                 if (ps->resources.count) {
752                         device->power.flags.power_resources = 1;
753                         ps->flags.valid = 1;
754                 }
755
756                 /* Evaluate "_PSx" to see if we can do explicit sets */
757                 object_name[2] = 'S';
758                 status = acpi_get_handle(device->handle, object_name, &handle);
759                 if (ACPI_SUCCESS(status)) {
760                         ps->flags.explicit_set = 1;
761                         ps->flags.valid = 1;
762                 }
763
764                 /* State is valid if we have some power control */
765                 if (ps->resources.count || ps->flags.explicit_set)
766                         ps->flags.valid = 1;
767
768                 ps->power = -1; /* Unknown - driver assigned */
769                 ps->latency = -1;       /* Unknown - driver assigned */
770         }
771
772         /* Set defaults for D0 and D3 states (always valid) */
773         device->power.states[ACPI_STATE_D0].flags.valid = 1;
774         device->power.states[ACPI_STATE_D0].power = 100;
775         device->power.states[ACPI_STATE_D3].flags.valid = 1;
776         device->power.states[ACPI_STATE_D3].power = 0;
777
778         /* TBD: System wake support and resource requirements. */
779
780         device->power.state = ACPI_STATE_UNKNOWN;
781
782         return 0;
783 }
784
785 static int acpi_bus_get_flags(struct acpi_device *device)
786 {
787         acpi_status status = AE_OK;
788         acpi_handle temp = NULL;
789
790
791         /* Presence of _STA indicates 'dynamic_status' */
792         status = acpi_get_handle(device->handle, "_STA", &temp);
793         if (ACPI_SUCCESS(status))
794                 device->flags.dynamic_status = 1;
795
796         /* Presence of _CID indicates 'compatible_ids' */
797         status = acpi_get_handle(device->handle, "_CID", &temp);
798         if (ACPI_SUCCESS(status))
799                 device->flags.compatible_ids = 1;
800
801         /* Presence of _RMV indicates 'removable' */
802         status = acpi_get_handle(device->handle, "_RMV", &temp);
803         if (ACPI_SUCCESS(status))
804                 device->flags.removable = 1;
805
806         /* Presence of _EJD|_EJ0 indicates 'ejectable' */
807         status = acpi_get_handle(device->handle, "_EJD", &temp);
808         if (ACPI_SUCCESS(status))
809                 device->flags.ejectable = 1;
810         else {
811                 status = acpi_get_handle(device->handle, "_EJ0", &temp);
812                 if (ACPI_SUCCESS(status))
813                         device->flags.ejectable = 1;
814         }
815
816         /* Presence of _LCK indicates 'lockable' */
817         status = acpi_get_handle(device->handle, "_LCK", &temp);
818         if (ACPI_SUCCESS(status))
819                 device->flags.lockable = 1;
820
821         /* Presence of _PS0|_PR0 indicates 'power manageable' */
822         status = acpi_get_handle(device->handle, "_PS0", &temp);
823         if (ACPI_FAILURE(status))
824                 status = acpi_get_handle(device->handle, "_PR0", &temp);
825         if (ACPI_SUCCESS(status))
826                 device->flags.power_manageable = 1;
827
828         /* Presence of _PRW indicates wake capable */
829         status = acpi_get_handle(device->handle, "_PRW", &temp);
830         if (ACPI_SUCCESS(status))
831                 device->flags.wake_capable = 1;
832
833         /* TBD: Peformance management */
834
835         return 0;
836 }
837
838 static void acpi_device_get_busid(struct acpi_device *device,
839                                   acpi_handle handle, int type)
840 {
841         char bus_id[5] = { '?', 0 };
842         struct acpi_buffer buffer = { sizeof(bus_id), bus_id };
843         int i = 0;
844
845         /*
846          * Bus ID
847          * ------
848          * The device's Bus ID is simply the object name.
849          * TBD: Shouldn't this value be unique (within the ACPI namespace)?
850          */
851         switch (type) {
852         case ACPI_BUS_TYPE_SYSTEM:
853                 strcpy(device->pnp.bus_id, "ACPI");
854                 break;
855         case ACPI_BUS_TYPE_POWER_BUTTON:
856                 strcpy(device->pnp.bus_id, "PWRF");
857                 break;
858         case ACPI_BUS_TYPE_SLEEP_BUTTON:
859                 strcpy(device->pnp.bus_id, "SLPF");
860                 break;
861         default:
862                 acpi_get_name(handle, ACPI_SINGLE_NAME, &buffer);
863                 /* Clean up trailing underscores (if any) */
864                 for (i = 3; i > 1; i--) {
865                         if (bus_id[i] == '_')
866                                 bus_id[i] = '\0';
867                         else
868                                 break;
869                 }
870                 strcpy(device->pnp.bus_id, bus_id);
871                 break;
872         }
873 }
874
875 static int
876 acpi_video_bus_match(struct acpi_device *device)
877 {
878         acpi_handle h_dummy1;
879         acpi_handle h_dummy2;
880         acpi_handle h_dummy3;
881
882
883         if (!device)
884                 return -EINVAL;
885
886         /* Since there is no HID, CID for ACPI Video drivers, we have
887          * to check well known required nodes for each feature we support.
888          */
889
890         /* Does this device able to support video switching ? */
891         if (ACPI_SUCCESS(acpi_get_handle(device->handle, "_DOD", &h_dummy1)) &&
892             ACPI_SUCCESS(acpi_get_handle(device->handle, "_DOS", &h_dummy2)))
893                 return 0;
894
895         /* Does this device able to retrieve a video ROM ? */
896         if (ACPI_SUCCESS(acpi_get_handle(device->handle, "_ROM", &h_dummy1)))
897                 return 0;
898
899         /* Does this device able to configure which video head to be POSTed ? */
900         if (ACPI_SUCCESS(acpi_get_handle(device->handle, "_VPO", &h_dummy1)) &&
901             ACPI_SUCCESS(acpi_get_handle(device->handle, "_GPD", &h_dummy2)) &&
902             ACPI_SUCCESS(acpi_get_handle(device->handle, "_SPD", &h_dummy3)))
903                 return 0;
904
905         return -ENODEV;
906 }
907
908 /*
909  * acpi_bay_match - see if a device is an ejectable driver bay
910  *
911  * If an acpi object is ejectable and has one of the ACPI ATA methods defined,
912  * then we can safely call it an ejectable drive bay
913  */
914 static int acpi_bay_match(struct acpi_device *device){
915         acpi_status status;
916         acpi_handle handle;
917         acpi_handle tmp;
918         acpi_handle phandle;
919
920         handle = device->handle;
921
922         status = acpi_get_handle(handle, "_EJ0", &tmp);
923         if (ACPI_FAILURE(status))
924                 return -ENODEV;
925
926         if ((ACPI_SUCCESS(acpi_get_handle(handle, "_GTF", &tmp))) ||
927                 (ACPI_SUCCESS(acpi_get_handle(handle, "_GTM", &tmp))) ||
928                 (ACPI_SUCCESS(acpi_get_handle(handle, "_STM", &tmp))) ||
929                 (ACPI_SUCCESS(acpi_get_handle(handle, "_SDD", &tmp))))
930                 return 0;
931
932         if (acpi_get_parent(handle, &phandle))
933                 return -ENODEV;
934
935         if ((ACPI_SUCCESS(acpi_get_handle(phandle, "_GTF", &tmp))) ||
936                 (ACPI_SUCCESS(acpi_get_handle(phandle, "_GTM", &tmp))) ||
937                 (ACPI_SUCCESS(acpi_get_handle(phandle, "_STM", &tmp))) ||
938                 (ACPI_SUCCESS(acpi_get_handle(phandle, "_SDD", &tmp))))
939                 return 0;
940
941         return -ENODEV;
942 }
943
944 static void acpi_device_set_id(struct acpi_device *device,
945                                struct acpi_device *parent, acpi_handle handle,
946                                int type)
947 {
948         struct acpi_device_info *info;
949         struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
950         char *hid = NULL;
951         char *uid = NULL;
952         struct acpi_compatible_id_list *cid_list = NULL;
953         acpi_status status;
954
955         switch (type) {
956         case ACPI_BUS_TYPE_DEVICE:
957                 status = acpi_get_object_info(handle, &buffer);
958                 if (ACPI_FAILURE(status)) {
959                         printk("%s: Error reading device info\n", __FUNCTION__);
960                         return;
961                 }
962
963                 info = buffer.pointer;
964                 if (info->valid & ACPI_VALID_HID)
965                         hid = info->hardware_id.value;
966                 if (info->valid & ACPI_VALID_UID)
967                         uid = info->unique_id.value;
968                 if (info->valid & ACPI_VALID_CID)
969                         cid_list = &info->compatibility_id;
970                 if (info->valid & ACPI_VALID_ADR) {
971                         device->pnp.bus_address = info->address;
972                         device->flags.bus_address = 1;
973                 }
974
975                 if(!(info->valid & (ACPI_VALID_HID | ACPI_VALID_CID))){
976                         status = acpi_video_bus_match(device);
977                         if(ACPI_SUCCESS(status))
978                                 hid = ACPI_VIDEO_HID;
979
980                         status = acpi_bay_match(device);
981                         if (ACPI_SUCCESS(status))
982                                 hid = ACPI_BAY_HID;
983                 }
984                 break;
985         case ACPI_BUS_TYPE_POWER:
986                 hid = ACPI_POWER_HID;
987                 break;
988         case ACPI_BUS_TYPE_PROCESSOR:
989                 hid = ACPI_PROCESSOR_HID;
990                 break;
991         case ACPI_BUS_TYPE_SYSTEM:
992                 hid = ACPI_SYSTEM_HID;
993                 break;
994         case ACPI_BUS_TYPE_THERMAL:
995                 hid = ACPI_THERMAL_HID;
996                 break;
997         case ACPI_BUS_TYPE_POWER_BUTTON:
998                 hid = ACPI_BUTTON_HID_POWERF;
999                 break;
1000         case ACPI_BUS_TYPE_SLEEP_BUTTON:
1001                 hid = ACPI_BUTTON_HID_SLEEPF;
1002                 break;
1003         }
1004
1005         /* 
1006          * \_SB
1007          * ----
1008          * Fix for the system root bus device -- the only root-level device.
1009          */
1010         if (((acpi_handle)parent == ACPI_ROOT_OBJECT) && (type == ACPI_BUS_TYPE_DEVICE)) {
1011                 hid = ACPI_BUS_HID;
1012                 strcpy(device->pnp.device_name, ACPI_BUS_DEVICE_NAME);
1013                 strcpy(device->pnp.device_class, ACPI_BUS_CLASS);
1014         }
1015
1016         if (hid) {
1017                 strcpy(device->pnp.hardware_id, hid);
1018                 device->flags.hardware_id = 1;
1019         }
1020         if (uid) {
1021                 strcpy(device->pnp.unique_id, uid);
1022                 device->flags.unique_id = 1;
1023         }
1024         if (cid_list) {
1025                 device->pnp.cid_list = kmalloc(cid_list->size, GFP_KERNEL);
1026                 if (device->pnp.cid_list)
1027                         memcpy(device->pnp.cid_list, cid_list, cid_list->size);
1028                 else
1029                         printk(KERN_ERR "Memory allocation error\n");
1030         }
1031
1032         kfree(buffer.pointer);
1033 }
1034
1035 static int acpi_device_set_context(struct acpi_device *device, int type)
1036 {
1037         acpi_status status = AE_OK;
1038         int result = 0;
1039         /*
1040          * Context
1041          * -------
1042          * Attach this 'struct acpi_device' to the ACPI object.  This makes
1043          * resolutions from handle->device very efficient.  Note that we need
1044          * to be careful with fixed-feature devices as they all attach to the
1045          * root object.
1046          */
1047         if (type != ACPI_BUS_TYPE_POWER_BUTTON &&
1048             type != ACPI_BUS_TYPE_SLEEP_BUTTON) {
1049                 status = acpi_attach_data(device->handle,
1050                                           acpi_bus_data_handler, device);
1051
1052                 if (ACPI_FAILURE(status)) {
1053                         printk("Error attaching device data\n");
1054                         result = -ENODEV;
1055                 }
1056         }
1057         return result;
1058 }
1059
1060 static int acpi_bus_remove(struct acpi_device *dev, int rmdevice)
1061 {
1062         if (!dev)
1063                 return -EINVAL;
1064
1065         dev->removal_type = ACPI_BUS_REMOVAL_EJECT;
1066         device_release_driver(&dev->dev);
1067
1068         if (!rmdevice)
1069                 return 0;
1070
1071         /*
1072          * unbind _ADR-Based Devices when hot removal
1073          */
1074         if (dev->flags.bus_address) {
1075                 if ((dev->parent) && (dev->parent->ops.unbind))
1076                         dev->parent->ops.unbind(dev);
1077         }
1078         acpi_device_unregister(dev, ACPI_BUS_REMOVAL_EJECT);
1079
1080         return 0;
1081 }
1082
1083 static int
1084 acpi_add_single_object(struct acpi_device **child,
1085                        struct acpi_device *parent, acpi_handle handle, int type,
1086                         struct acpi_bus_ops *ops)
1087 {
1088         int result = 0;
1089         struct acpi_device *device = NULL;
1090
1091
1092         if (!child)
1093                 return -EINVAL;
1094
1095         device = kzalloc(sizeof(struct acpi_device), GFP_KERNEL);
1096         if (!device) {
1097                 printk(KERN_ERR PREFIX "Memory allocation error\n");
1098                 return -ENOMEM;
1099         }
1100
1101         device->handle = handle;
1102         device->parent = parent;
1103         device->bus_ops = *ops; /* workround for not call .start */
1104
1105
1106         acpi_device_get_busid(device, handle, type);
1107
1108         /*
1109          * Flags
1110          * -----
1111          * Get prior to calling acpi_bus_get_status() so we know whether
1112          * or not _STA is present.  Note that we only look for object
1113          * handles -- cannot evaluate objects until we know the device is
1114          * present and properly initialized.
1115          */
1116         result = acpi_bus_get_flags(device);
1117         if (result)
1118                 goto end;
1119
1120         /*
1121          * Status
1122          * ------
1123          * See if the device is present.  We always assume that non-Device
1124          * and non-Processor objects (e.g. thermal zones, power resources,
1125          * etc.) are present, functioning, etc. (at least when parent object
1126          * is present).  Note that _STA has a different meaning for some
1127          * objects (e.g. power resources) so we need to be careful how we use
1128          * it.
1129          */
1130         switch (type) {
1131         case ACPI_BUS_TYPE_PROCESSOR:
1132         case ACPI_BUS_TYPE_DEVICE:
1133                 result = acpi_bus_get_status(device);
1134                 if (ACPI_FAILURE(result) || !device->status.present) {
1135                         result = -ENOENT;
1136                         goto end;
1137                 }
1138                 break;
1139         default:
1140                 STRUCT_TO_INT(device->status) =
1141                     ACPI_STA_DEVICE_PRESENT | ACPI_STA_DEVICE_ENABLED |
1142                     ACPI_STA_DEVICE_UI      | ACPI_STA_DEVICE_FUNCTIONING;
1143                 break;
1144         }
1145
1146         /*
1147          * Initialize Device
1148          * -----------------
1149          * TBD: Synch with Core's enumeration/initialization process.
1150          */
1151
1152         /*
1153          * Hardware ID, Unique ID, & Bus Address
1154          * -------------------------------------
1155          */
1156         acpi_device_set_id(device, parent, handle, type);
1157
1158         /*
1159          * Power Management
1160          * ----------------
1161          */
1162         if (device->flags.power_manageable) {
1163                 result = acpi_bus_get_power_flags(device);
1164                 if (result)
1165                         goto end;
1166         }
1167
1168         /*
1169          * Wakeup device management
1170          *-----------------------
1171          */
1172         if (device->flags.wake_capable) {
1173                 result = acpi_bus_get_wakeup_device_flags(device);
1174                 if (result)
1175                         goto end;
1176         }
1177
1178         /*
1179          * Performance Management
1180          * ----------------------
1181          */
1182         if (device->flags.performance_manageable) {
1183                 result = acpi_bus_get_perf_flags(device);
1184                 if (result)
1185                         goto end;
1186         }
1187
1188         if ((result = acpi_device_set_context(device, type)))
1189                 goto end;
1190
1191         result = acpi_device_register(device, parent);
1192
1193         /*
1194          * Bind _ADR-Based Devices when hot add
1195          */
1196         if (device->flags.bus_address) {
1197                 if (device->parent && device->parent->ops.bind)
1198                         device->parent->ops.bind(device);
1199         }
1200
1201       end:
1202         if (!result)
1203                 *child = device;
1204         else {
1205                 kfree(device->pnp.cid_list);
1206                 kfree(device);
1207         }
1208
1209         return result;
1210 }
1211
1212 static int acpi_bus_scan(struct acpi_device *start, struct acpi_bus_ops *ops)
1213 {
1214         acpi_status status = AE_OK;
1215         struct acpi_device *parent = NULL;
1216         struct acpi_device *child = NULL;
1217         acpi_handle phandle = NULL;
1218         acpi_handle chandle = NULL;
1219         acpi_object_type type = 0;
1220         u32 level = 1;
1221
1222
1223         if (!start)
1224                 return -EINVAL;
1225
1226         parent = start;
1227         phandle = start->handle;
1228
1229         /*
1230          * Parse through the ACPI namespace, identify all 'devices', and
1231          * create a new 'struct acpi_device' for each.
1232          */
1233         while ((level > 0) && parent) {
1234
1235                 status = acpi_get_next_object(ACPI_TYPE_ANY, phandle,
1236                                               chandle, &chandle);
1237
1238                 /*
1239                  * If this scope is exhausted then move our way back up.
1240                  */
1241                 if (ACPI_FAILURE(status)) {
1242                         level--;
1243                         chandle = phandle;
1244                         acpi_get_parent(phandle, &phandle);
1245                         if (parent->parent)
1246                                 parent = parent->parent;
1247                         continue;
1248                 }
1249
1250                 status = acpi_get_type(chandle, &type);
1251                 if (ACPI_FAILURE(status))
1252                         continue;
1253
1254                 /*
1255                  * If this is a scope object then parse it (depth-first).
1256                  */
1257                 if (type == ACPI_TYPE_LOCAL_SCOPE) {
1258                         level++;
1259                         phandle = chandle;
1260                         chandle = NULL;
1261                         continue;
1262                 }
1263
1264                 /*
1265                  * We're only interested in objects that we consider 'devices'.
1266                  */
1267                 switch (type) {
1268                 case ACPI_TYPE_DEVICE:
1269                         type = ACPI_BUS_TYPE_DEVICE;
1270                         break;
1271                 case ACPI_TYPE_PROCESSOR:
1272                         type = ACPI_BUS_TYPE_PROCESSOR;
1273                         break;
1274                 case ACPI_TYPE_THERMAL:
1275                         type = ACPI_BUS_TYPE_THERMAL;
1276                         break;
1277                 case ACPI_TYPE_POWER:
1278                         type = ACPI_BUS_TYPE_POWER;
1279                         break;
1280                 default:
1281                         continue;
1282                 }
1283
1284                 if (ops->acpi_op_add)
1285                         status = acpi_add_single_object(&child, parent,
1286                                 chandle, type, ops);
1287                 else
1288                         status = acpi_bus_get_device(chandle, &child);
1289
1290                 if (ACPI_FAILURE(status))
1291                         continue;
1292
1293                 if (ops->acpi_op_start && !(ops->acpi_op_add)) {
1294                         status = acpi_start_single_object(child);
1295                         if (ACPI_FAILURE(status))
1296                                 continue;
1297                 }
1298
1299                 /*
1300                  * If the device is present, enabled, and functioning then
1301                  * parse its scope (depth-first).  Note that we need to
1302                  * represent absent devices to facilitate PnP notifications
1303                  * -- but only the subtree head (not all of its children,
1304                  * which will be enumerated when the parent is inserted).
1305                  *
1306                  * TBD: Need notifications and other detection mechanisms
1307                  *      in place before we can fully implement this.
1308                  */
1309                 if (child->status.present) {
1310                         status = acpi_get_next_object(ACPI_TYPE_ANY, chandle,
1311                                                       NULL, NULL);
1312                         if (ACPI_SUCCESS(status)) {
1313                                 level++;
1314                                 phandle = chandle;
1315                                 chandle = NULL;
1316                                 parent = child;
1317                         }
1318                 }
1319         }
1320
1321         return 0;
1322 }
1323
1324 int
1325 acpi_bus_add(struct acpi_device **child,
1326              struct acpi_device *parent, acpi_handle handle, int type)
1327 {
1328         int result;
1329         struct acpi_bus_ops ops;
1330
1331         memset(&ops, 0, sizeof(ops));
1332         ops.acpi_op_add = 1;
1333
1334         result = acpi_add_single_object(child, parent, handle, type, &ops);
1335         if (!result)
1336                 result = acpi_bus_scan(*child, &ops);
1337
1338         return result;
1339 }
1340
1341 EXPORT_SYMBOL(acpi_bus_add);
1342
1343 int acpi_bus_start(struct acpi_device *device)
1344 {
1345         int result;
1346         struct acpi_bus_ops ops;
1347
1348
1349         if (!device)
1350                 return -EINVAL;
1351
1352         result = acpi_start_single_object(device);
1353         if (!result) {
1354                 memset(&ops, 0, sizeof(ops));
1355                 ops.acpi_op_start = 1;
1356                 result = acpi_bus_scan(device, &ops);
1357         }
1358         return result;
1359 }
1360
1361 EXPORT_SYMBOL(acpi_bus_start);
1362
1363 int acpi_bus_trim(struct acpi_device *start, int rmdevice)
1364 {
1365         acpi_status status;
1366         struct acpi_device *parent, *child;
1367         acpi_handle phandle, chandle;
1368         acpi_object_type type;
1369         u32 level = 1;
1370         int err = 0;
1371
1372         parent = start;
1373         phandle = start->handle;
1374         child = chandle = NULL;
1375
1376         while ((level > 0) && parent && (!err)) {
1377                 status = acpi_get_next_object(ACPI_TYPE_ANY, phandle,
1378                                               chandle, &chandle);
1379
1380                 /*
1381                  * If this scope is exhausted then move our way back up.
1382                  */
1383                 if (ACPI_FAILURE(status)) {
1384                         level--;
1385                         chandle = phandle;
1386                         acpi_get_parent(phandle, &phandle);
1387                         child = parent;
1388                         parent = parent->parent;
1389
1390                         if (level == 0)
1391                                 err = acpi_bus_remove(child, rmdevice);
1392                         else
1393                                 err = acpi_bus_remove(child, 1);
1394
1395                         continue;
1396                 }
1397
1398                 status = acpi_get_type(chandle, &type);
1399                 if (ACPI_FAILURE(status)) {
1400                         continue;
1401                 }
1402                 /*
1403                  * If there is a device corresponding to chandle then
1404                  * parse it (depth-first).
1405                  */
1406                 if (acpi_bus_get_device(chandle, &child) == 0) {
1407                         level++;
1408                         phandle = chandle;
1409                         chandle = NULL;
1410                         parent = child;
1411                 }
1412                 continue;
1413         }
1414         return err;
1415 }
1416 EXPORT_SYMBOL_GPL(acpi_bus_trim);
1417
1418
1419 static int acpi_bus_scan_fixed(struct acpi_device *root)
1420 {
1421         int result = 0;
1422         struct acpi_device *device = NULL;
1423         struct acpi_bus_ops ops;
1424
1425         if (!root)
1426                 return -ENODEV;
1427
1428         memset(&ops, 0, sizeof(ops));
1429         ops.acpi_op_add = 1;
1430         ops.acpi_op_start = 1;
1431
1432         /*
1433          * Enumerate all fixed-feature devices.
1434          */
1435         if ((acpi_gbl_FADT.flags & ACPI_FADT_POWER_BUTTON) == 0) {
1436                 result = acpi_add_single_object(&device, acpi_root,
1437                                                 NULL,
1438                                                 ACPI_BUS_TYPE_POWER_BUTTON,
1439                                                 &ops);
1440         }
1441
1442         if ((acpi_gbl_FADT.flags & ACPI_FADT_SLEEP_BUTTON) == 0) {
1443                 result = acpi_add_single_object(&device, acpi_root,
1444                                                 NULL,
1445                                                 ACPI_BUS_TYPE_SLEEP_BUTTON,
1446                                                 &ops);
1447         }
1448
1449         return result;
1450 }
1451
1452 static int __init acpi_scan_init(void)
1453 {
1454         int result;
1455         struct acpi_bus_ops ops;
1456
1457
1458         if (acpi_disabled)
1459                 return 0;
1460
1461         memset(&ops, 0, sizeof(ops));
1462         ops.acpi_op_add = 1;
1463         ops.acpi_op_start = 1;
1464
1465         result = bus_register(&acpi_bus_type);
1466         if (result) {
1467                 /* We don't want to quit even if we failed to add suspend/resume */
1468                 printk(KERN_ERR PREFIX "Could not register bus type\n");
1469         }
1470
1471         /*
1472          * Create the root device in the bus's device tree
1473          */
1474         result = acpi_add_single_object(&acpi_root, NULL, ACPI_ROOT_OBJECT,
1475                                         ACPI_BUS_TYPE_SYSTEM, &ops);
1476         if (result)
1477                 goto Done;
1478
1479         /*
1480          * Enumerate devices in the ACPI namespace.
1481          */
1482         result = acpi_bus_scan_fixed(acpi_root);
1483         if (!result)
1484                 result = acpi_bus_scan(acpi_root, &ops);
1485
1486         if (result)
1487                 acpi_device_unregister(acpi_root, ACPI_BUS_REMOVAL_NORMAL);
1488
1489       Done:
1490         return result;
1491 }
1492
1493 subsys_initcall(acpi_scan_init);