ACPI: delete tracing macros from drivers/acpi/*.c
[linux-2.6.git] / 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/acpi.h>
8
9 #include <acpi/acpi_drivers.h>
10 #include <acpi/acinterp.h>      /* for acpi_ex_eisa_id_to_string() */
11
12 #define _COMPONENT              ACPI_BUS_COMPONENT
13 ACPI_MODULE_NAME("scan")
14 #define STRUCT_TO_INT(s)        (*((int*)&s))
15 extern struct acpi_device *acpi_root;
16
17 #define ACPI_BUS_CLASS                  "system_bus"
18 #define ACPI_BUS_HID                    "ACPI_BUS"
19 #define ACPI_BUS_DRIVER_NAME            "ACPI Bus Driver"
20 #define ACPI_BUS_DEVICE_NAME            "System Bus"
21
22 static LIST_HEAD(acpi_device_list);
23 DEFINE_SPINLOCK(acpi_device_lock);
24 LIST_HEAD(acpi_wakeup_device_list);
25
26
27 static void acpi_device_release(struct kobject *kobj)
28 {
29         struct acpi_device *dev = container_of(kobj, struct acpi_device, kobj);
30         kfree(dev->pnp.cid_list);
31         kfree(dev);
32 }
33
34 struct acpi_device_attribute {
35         struct attribute attr;
36          ssize_t(*show) (struct acpi_device *, char *);
37          ssize_t(*store) (struct acpi_device *, const char *, size_t);
38 };
39
40 typedef void acpi_device_sysfs_files(struct kobject *,
41                                      const struct attribute *);
42
43 static void setup_sys_fs_device_files(struct acpi_device *dev,
44                                       acpi_device_sysfs_files * func);
45
46 #define create_sysfs_device_files(dev)  \
47         setup_sys_fs_device_files(dev, (acpi_device_sysfs_files *)&sysfs_create_file)
48 #define remove_sysfs_device_files(dev)  \
49         setup_sys_fs_device_files(dev, (acpi_device_sysfs_files *)&sysfs_remove_file)
50
51 #define to_acpi_device(n) container_of(n, struct acpi_device, kobj)
52 #define to_handle_attr(n) container_of(n, struct acpi_device_attribute, attr);
53
54 static ssize_t acpi_device_attr_show(struct kobject *kobj,
55                                      struct attribute *attr, char *buf)
56 {
57         struct acpi_device *device = to_acpi_device(kobj);
58         struct acpi_device_attribute *attribute = to_handle_attr(attr);
59         return attribute->show ? attribute->show(device, buf) : -EIO;
60 }
61 static ssize_t acpi_device_attr_store(struct kobject *kobj,
62                                       struct attribute *attr, const char *buf,
63                                       size_t len)
64 {
65         struct acpi_device *device = to_acpi_device(kobj);
66         struct acpi_device_attribute *attribute = to_handle_attr(attr);
67         return attribute->store ? attribute->store(device, buf, len) : -EIO;
68 }
69
70 static struct sysfs_ops acpi_device_sysfs_ops = {
71         .show = acpi_device_attr_show,
72         .store = acpi_device_attr_store,
73 };
74
75 static struct kobj_type ktype_acpi_ns = {
76         .sysfs_ops = &acpi_device_sysfs_ops,
77         .release = acpi_device_release,
78 };
79
80 static int namespace_uevent(struct kset *kset, struct kobject *kobj,
81                              char **envp, int num_envp, char *buffer,
82                              int buffer_size)
83 {
84         struct acpi_device *dev = to_acpi_device(kobj);
85         int i = 0;
86         int len = 0;
87
88         if (!dev->driver)
89                 return 0;
90
91         if (add_uevent_var(envp, num_envp, &i, buffer, buffer_size, &len,
92                            "PHYSDEVDRIVER=%s", dev->driver->name))
93                 return -ENOMEM;
94
95         envp[i] = NULL;
96
97         return 0;
98 }
99
100 static struct kset_uevent_ops namespace_uevent_ops = {
101         .uevent = &namespace_uevent,
102 };
103
104 static struct kset acpi_namespace_kset = {
105         .kobj = {
106                  .name = "namespace",
107                  },
108         .subsys = &acpi_subsys,
109         .ktype = &ktype_acpi_ns,
110         .uevent_ops = &namespace_uevent_ops,
111 };
112
113 static void acpi_device_register(struct acpi_device *device,
114                                  struct acpi_device *parent)
115 {
116         /*
117          * Linkage
118          * -------
119          * Link this device to its parent and siblings.
120          */
121         INIT_LIST_HEAD(&device->children);
122         INIT_LIST_HEAD(&device->node);
123         INIT_LIST_HEAD(&device->g_list);
124         INIT_LIST_HEAD(&device->wakeup_list);
125
126         spin_lock(&acpi_device_lock);
127         if (device->parent) {
128                 list_add_tail(&device->node, &device->parent->children);
129                 list_add_tail(&device->g_list, &device->parent->g_list);
130         } else
131                 list_add_tail(&device->g_list, &acpi_device_list);
132         if (device->wakeup.flags.valid)
133                 list_add_tail(&device->wakeup_list, &acpi_wakeup_device_list);
134         spin_unlock(&acpi_device_lock);
135
136         strlcpy(device->kobj.name, device->pnp.bus_id, KOBJ_NAME_LEN);
137         if (parent)
138                 device->kobj.parent = &parent->kobj;
139         device->kobj.ktype = &ktype_acpi_ns;
140         device->kobj.kset = &acpi_namespace_kset;
141         kobject_register(&device->kobj);
142         create_sysfs_device_files(device);
143 }
144
145 static void acpi_device_unregister(struct acpi_device *device, int type)
146 {
147         spin_lock(&acpi_device_lock);
148         if (device->parent) {
149                 list_del(&device->node);
150                 list_del(&device->g_list);
151         } else
152                 list_del(&device->g_list);
153
154         list_del(&device->wakeup_list);
155
156         spin_unlock(&acpi_device_lock);
157
158         acpi_detach_data(device->handle, acpi_bus_data_handler);
159         remove_sysfs_device_files(device);
160         kobject_unregister(&device->kobj);
161 }
162
163 void acpi_bus_data_handler(acpi_handle handle, u32 function, void *context)
164 {
165
166         /* TBD */
167
168         return;
169 }
170
171 static int acpi_bus_get_power_flags(struct acpi_device *device)
172 {
173         acpi_status status = 0;
174         acpi_handle handle = NULL;
175         u32 i = 0;
176
177
178         /*
179          * Power Management Flags
180          */
181         status = acpi_get_handle(device->handle, "_PSC", &handle);
182         if (ACPI_SUCCESS(status))
183                 device->power.flags.explicit_get = 1;
184         status = acpi_get_handle(device->handle, "_IRC", &handle);
185         if (ACPI_SUCCESS(status))
186                 device->power.flags.inrush_current = 1;
187
188         /*
189          * Enumerate supported power management states
190          */
191         for (i = ACPI_STATE_D0; i <= ACPI_STATE_D3; i++) {
192                 struct acpi_device_power_state *ps = &device->power.states[i];
193                 char object_name[5] = { '_', 'P', 'R', '0' + i, '\0' };
194
195                 /* Evaluate "_PRx" to se if power resources are referenced */
196                 acpi_evaluate_reference(device->handle, object_name, NULL,
197                                         &ps->resources);
198                 if (ps->resources.count) {
199                         device->power.flags.power_resources = 1;
200                         ps->flags.valid = 1;
201                 }
202
203                 /* Evaluate "_PSx" to see if we can do explicit sets */
204                 object_name[2] = 'S';
205                 status = acpi_get_handle(device->handle, object_name, &handle);
206                 if (ACPI_SUCCESS(status)) {
207                         ps->flags.explicit_set = 1;
208                         ps->flags.valid = 1;
209                 }
210
211                 /* State is valid if we have some power control */
212                 if (ps->resources.count || ps->flags.explicit_set)
213                         ps->flags.valid = 1;
214
215                 ps->power = -1; /* Unknown - driver assigned */
216                 ps->latency = -1;       /* Unknown - driver assigned */
217         }
218
219         /* Set defaults for D0 and D3 states (always valid) */
220         device->power.states[ACPI_STATE_D0].flags.valid = 1;
221         device->power.states[ACPI_STATE_D0].power = 100;
222         device->power.states[ACPI_STATE_D3].flags.valid = 1;
223         device->power.states[ACPI_STATE_D3].power = 0;
224
225         /* TBD: System wake support and resource requirements. */
226
227         device->power.state = ACPI_STATE_UNKNOWN;
228
229         return 0;
230 }
231
232 int acpi_match_ids(struct acpi_device *device, char *ids)
233 {
234         if (device->flags.hardware_id)
235                 if (strstr(ids, device->pnp.hardware_id))
236                         return 0;
237
238         if (device->flags.compatible_ids) {
239                 struct acpi_compatible_id_list *cid_list = device->pnp.cid_list;
240                 int i;
241
242                 /* compare multiple _CID entries against driver ids */
243                 for (i = 0; i < cid_list->count; i++) {
244                         if (strstr(ids, cid_list->id[i].value))
245                                 return 0;
246                 }
247         }
248         return -ENOENT;
249 }
250
251 static acpi_status
252 acpi_bus_extract_wakeup_device_power_package(struct acpi_device *device,
253                                              union acpi_object *package)
254 {
255         int i = 0;
256         union acpi_object *element = NULL;
257
258         if (!device || !package || (package->package.count < 2))
259                 return AE_BAD_PARAMETER;
260
261         element = &(package->package.elements[0]);
262         if (!element)
263                 return AE_BAD_PARAMETER;
264         if (element->type == ACPI_TYPE_PACKAGE) {
265                 if ((element->package.count < 2) ||
266                     (element->package.elements[0].type !=
267                      ACPI_TYPE_LOCAL_REFERENCE)
268                     || (element->package.elements[1].type != ACPI_TYPE_INTEGER))
269                         return AE_BAD_DATA;
270                 device->wakeup.gpe_device =
271                     element->package.elements[0].reference.handle;
272                 device->wakeup.gpe_number =
273                     (u32) element->package.elements[1].integer.value;
274         } else if (element->type == ACPI_TYPE_INTEGER) {
275                 device->wakeup.gpe_number = element->integer.value;
276         } else
277                 return AE_BAD_DATA;
278
279         element = &(package->package.elements[1]);
280         if (element->type != ACPI_TYPE_INTEGER) {
281                 return AE_BAD_DATA;
282         }
283         device->wakeup.sleep_state = element->integer.value;
284
285         if ((package->package.count - 2) > ACPI_MAX_HANDLES) {
286                 return AE_NO_MEMORY;
287         }
288         device->wakeup.resources.count = package->package.count - 2;
289         for (i = 0; i < device->wakeup.resources.count; i++) {
290                 element = &(package->package.elements[i + 2]);
291                 if (element->type != ACPI_TYPE_ANY) {
292                         return AE_BAD_DATA;
293                 }
294
295                 device->wakeup.resources.handles[i] = element->reference.handle;
296         }
297
298         return AE_OK;
299 }
300
301 static int acpi_bus_get_wakeup_device_flags(struct acpi_device *device)
302 {
303         acpi_status status = 0;
304         struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
305         union acpi_object *package = NULL;
306
307
308         /* _PRW */
309         status = acpi_evaluate_object(device->handle, "_PRW", NULL, &buffer);
310         if (ACPI_FAILURE(status)) {
311                 ACPI_EXCEPTION((AE_INFO, status, "Evaluating _PRW"));
312                 goto end;
313         }
314
315         package = (union acpi_object *)buffer.pointer;
316         status = acpi_bus_extract_wakeup_device_power_package(device, package);
317         if (ACPI_FAILURE(status)) {
318                 ACPI_EXCEPTION((AE_INFO, status, "Extracting _PRW package"));
319                 goto end;
320         }
321
322         acpi_os_free(buffer.pointer);
323
324         device->wakeup.flags.valid = 1;
325         /* Power button, Lid switch always enable wakeup */
326         if (!acpi_match_ids(device, "PNP0C0D,PNP0C0C,PNP0C0E"))
327                 device->wakeup.flags.run_wake = 1;
328
329       end:
330         if (ACPI_FAILURE(status))
331                 device->flags.wake_capable = 0;
332         return 0;
333 }
334
335 /* --------------------------------------------------------------------------
336                 ACPI sysfs device file support
337    -------------------------------------------------------------------------- */
338 static ssize_t acpi_eject_store(struct acpi_device *device,
339                                 const char *buf, size_t count);
340
341 #define ACPI_DEVICE_ATTR(_name,_mode,_show,_store) \
342 static struct acpi_device_attribute acpi_device_attr_##_name = \
343                 __ATTR(_name, _mode, _show, _store)
344
345 ACPI_DEVICE_ATTR(eject, 0200, NULL, acpi_eject_store);
346
347 /**
348  * setup_sys_fs_device_files - sets up the device files under device namespace
349  * @dev:        acpi_device object
350  * @func:       function pointer to create or destroy the device file
351  */
352 static void
353 setup_sys_fs_device_files(struct acpi_device *dev,
354                           acpi_device_sysfs_files * func)
355 {
356         acpi_status status;
357         acpi_handle temp = NULL;
358
359         /*
360          * If device has _EJ0, 'eject' file is created that is used to trigger
361          * hot-removal function from userland.
362          */
363         status = acpi_get_handle(dev->handle, "_EJ0", &temp);
364         if (ACPI_SUCCESS(status))
365                 (*(func)) (&dev->kobj, &acpi_device_attr_eject.attr);
366 }
367
368 static int acpi_eject_operation(acpi_handle handle, int lockable)
369 {
370         struct acpi_object_list arg_list;
371         union acpi_object arg;
372         acpi_status status = AE_OK;
373
374         /*
375          * TBD: evaluate _PS3?
376          */
377
378         if (lockable) {
379                 arg_list.count = 1;
380                 arg_list.pointer = &arg;
381                 arg.type = ACPI_TYPE_INTEGER;
382                 arg.integer.value = 0;
383                 acpi_evaluate_object(handle, "_LCK", &arg_list, NULL);
384         }
385
386         arg_list.count = 1;
387         arg_list.pointer = &arg;
388         arg.type = ACPI_TYPE_INTEGER;
389         arg.integer.value = 1;
390
391         /*
392          * TBD: _EJD support.
393          */
394
395         status = acpi_evaluate_object(handle, "_EJ0", &arg_list, NULL);
396         if (ACPI_FAILURE(status)) {
397                 return (-ENODEV);
398         }
399
400         return (0);
401 }
402
403 static ssize_t
404 acpi_eject_store(struct acpi_device *device, const char *buf, size_t count)
405 {
406         int result;
407         int ret = count;
408         int islockable;
409         acpi_status status;
410         acpi_handle handle;
411         acpi_object_type type = 0;
412
413         if ((!count) || (buf[0] != '1')) {
414                 return -EINVAL;
415         }
416 #ifndef FORCE_EJECT
417         if (device->driver == NULL) {
418                 ret = -ENODEV;
419                 goto err;
420         }
421 #endif
422         status = acpi_get_type(device->handle, &type);
423         if (ACPI_FAILURE(status) || (!device->flags.ejectable)) {
424                 ret = -ENODEV;
425                 goto err;
426         }
427
428         islockable = device->flags.lockable;
429         handle = device->handle;
430
431         result = acpi_bus_trim(device, 1);
432
433         if (!result)
434                 result = acpi_eject_operation(handle, islockable);
435
436         if (result) {
437                 ret = -EBUSY;
438         }
439       err:
440         return ret;
441 }
442
443 /* --------------------------------------------------------------------------
444                               Performance Management
445    -------------------------------------------------------------------------- */
446
447 static int acpi_bus_get_perf_flags(struct acpi_device *device)
448 {
449         device->performance.state = ACPI_STATE_UNKNOWN;
450         return 0;
451 }
452
453 /* --------------------------------------------------------------------------
454                                  Driver Management
455    -------------------------------------------------------------------------- */
456
457 static LIST_HEAD(acpi_bus_drivers);
458
459 /**
460  * acpi_bus_match - match device IDs to driver's supported IDs
461  * @device: the device that we are trying to match to a driver
462  * @driver: driver whose device id table is being checked
463  *
464  * Checks the device's hardware (_HID) or compatible (_CID) ids to see if it
465  * matches the specified driver's criteria.
466  */
467 static int
468 acpi_bus_match(struct acpi_device *device, struct acpi_driver *driver)
469 {
470         if (driver && driver->ops.match)
471                 return driver->ops.match(device, driver);
472         return acpi_match_ids(device, driver->ids);
473 }
474
475 /**
476  * acpi_bus_driver_init - add a device to a driver
477  * @device: the device to add and initialize
478  * @driver: driver for the device
479  *
480  * Used to initialize a device via its device driver.  Called whenever a 
481  * driver is bound to a device.  Invokes the driver's add() and start() ops.
482  */
483 static int
484 acpi_bus_driver_init(struct acpi_device *device, struct acpi_driver *driver)
485 {
486         int result = 0;
487
488
489         if (!device || !driver)
490                 return -EINVAL;
491
492         if (!driver->ops.add)
493                 return -ENOSYS;
494
495         result = driver->ops.add(device);
496         if (result) {
497                 device->driver = NULL;
498                 acpi_driver_data(device) = NULL;
499                 return result;
500         }
501
502         device->driver = driver;
503
504         /*
505          * TBD - Configuration Management: Assign resources to device based
506          * upon possible configuration and currently allocated resources.
507          */
508
509         ACPI_DEBUG_PRINT((ACPI_DB_INFO,
510                           "Driver successfully bound to device\n"));
511         return 0;
512 }
513
514 static int acpi_start_single_object(struct acpi_device *device)
515 {
516         int result = 0;
517         struct acpi_driver *driver;
518
519
520         if (!(driver = device->driver))
521                 return 0;
522
523         if (driver->ops.start) {
524                 result = driver->ops.start(device);
525                 if (result && driver->ops.remove)
526                         driver->ops.remove(device, ACPI_BUS_REMOVAL_NORMAL);
527         }
528
529         return result;
530 }
531
532 static void acpi_driver_attach(struct acpi_driver *drv)
533 {
534         struct list_head *node, *next;
535
536
537         spin_lock(&acpi_device_lock);
538         list_for_each_safe(node, next, &acpi_device_list) {
539                 struct acpi_device *dev =
540                     container_of(node, struct acpi_device, g_list);
541
542                 if (dev->driver || !dev->status.present)
543                         continue;
544                 spin_unlock(&acpi_device_lock);
545
546                 if (!acpi_bus_match(dev, drv)) {
547                         if (!acpi_bus_driver_init(dev, drv)) {
548                                 acpi_start_single_object(dev);
549                                 atomic_inc(&drv->references);
550                                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
551                                                   "Found driver [%s] for device [%s]\n",
552                                                   drv->name, dev->pnp.bus_id));
553                         }
554                 }
555                 spin_lock(&acpi_device_lock);
556         }
557         spin_unlock(&acpi_device_lock);
558 }
559
560 static void acpi_driver_detach(struct acpi_driver *drv)
561 {
562         struct list_head *node, *next;
563
564
565         spin_lock(&acpi_device_lock);
566         list_for_each_safe(node, next, &acpi_device_list) {
567                 struct acpi_device *dev =
568                     container_of(node, struct acpi_device, g_list);
569
570                 if (dev->driver == drv) {
571                         spin_unlock(&acpi_device_lock);
572                         if (drv->ops.remove)
573                                 drv->ops.remove(dev, ACPI_BUS_REMOVAL_NORMAL);
574                         spin_lock(&acpi_device_lock);
575                         dev->driver = NULL;
576                         dev->driver_data = NULL;
577                         atomic_dec(&drv->references);
578                 }
579         }
580         spin_unlock(&acpi_device_lock);
581 }
582
583 /**
584  * acpi_bus_register_driver - register a driver with the ACPI bus
585  * @driver: driver being registered
586  *
587  * Registers a driver with the ACPI bus.  Searches the namespace for all
588  * devices that match the driver's criteria and binds.  Returns zero for
589  * success or a negative error status for failure.
590  */
591 int acpi_bus_register_driver(struct acpi_driver *driver)
592 {
593
594         if (acpi_disabled)
595                 return -ENODEV;
596
597         spin_lock(&acpi_device_lock);
598         list_add_tail(&driver->node, &acpi_bus_drivers);
599         spin_unlock(&acpi_device_lock);
600         acpi_driver_attach(driver);
601
602         return 0;
603 }
604
605 EXPORT_SYMBOL(acpi_bus_register_driver);
606
607 /**
608  * acpi_bus_unregister_driver - unregisters a driver with the APIC bus
609  * @driver: driver to unregister
610  *
611  * Unregisters a driver with the ACPI bus.  Searches the namespace for all
612  * devices that match the driver's criteria and unbinds.
613  */
614 void acpi_bus_unregister_driver(struct acpi_driver *driver)
615 {
616         acpi_driver_detach(driver);
617
618         if (!atomic_read(&driver->references)) {
619                 spin_lock(&acpi_device_lock);
620                 list_del_init(&driver->node);
621                 spin_unlock(&acpi_device_lock);
622         }
623         return;
624 }
625
626 EXPORT_SYMBOL(acpi_bus_unregister_driver);
627
628 /**
629  * acpi_bus_find_driver - check if there is a driver installed for the device
630  * @device: device that we are trying to find a supporting driver for
631  *
632  * Parses the list of registered drivers looking for a driver applicable for
633  * the specified device.
634  */
635 static int acpi_bus_find_driver(struct acpi_device *device)
636 {
637         int result = 0;
638         struct list_head *node, *next;
639
640
641         spin_lock(&acpi_device_lock);
642         list_for_each_safe(node, next, &acpi_bus_drivers) {
643                 struct acpi_driver *driver =
644                     container_of(node, struct acpi_driver, node);
645
646                 atomic_inc(&driver->references);
647                 spin_unlock(&acpi_device_lock);
648                 if (!acpi_bus_match(device, driver)) {
649                         result = acpi_bus_driver_init(device, driver);
650                         if (!result)
651                                 goto Done;
652                 }
653                 atomic_dec(&driver->references);
654                 spin_lock(&acpi_device_lock);
655         }
656         spin_unlock(&acpi_device_lock);
657
658       Done:
659         return result;
660 }
661
662 /* --------------------------------------------------------------------------
663                                  Device Enumeration
664    -------------------------------------------------------------------------- */
665
666 static int acpi_bus_get_flags(struct acpi_device *device)
667 {
668         acpi_status status = AE_OK;
669         acpi_handle temp = NULL;
670
671
672         /* Presence of _STA indicates 'dynamic_status' */
673         status = acpi_get_handle(device->handle, "_STA", &temp);
674         if (ACPI_SUCCESS(status))
675                 device->flags.dynamic_status = 1;
676
677         /* Presence of _CID indicates 'compatible_ids' */
678         status = acpi_get_handle(device->handle, "_CID", &temp);
679         if (ACPI_SUCCESS(status))
680                 device->flags.compatible_ids = 1;
681
682         /* Presence of _RMV indicates 'removable' */
683         status = acpi_get_handle(device->handle, "_RMV", &temp);
684         if (ACPI_SUCCESS(status))
685                 device->flags.removable = 1;
686
687         /* Presence of _EJD|_EJ0 indicates 'ejectable' */
688         status = acpi_get_handle(device->handle, "_EJD", &temp);
689         if (ACPI_SUCCESS(status))
690                 device->flags.ejectable = 1;
691         else {
692                 status = acpi_get_handle(device->handle, "_EJ0", &temp);
693                 if (ACPI_SUCCESS(status))
694                         device->flags.ejectable = 1;
695         }
696
697         /* Presence of _LCK indicates 'lockable' */
698         status = acpi_get_handle(device->handle, "_LCK", &temp);
699         if (ACPI_SUCCESS(status))
700                 device->flags.lockable = 1;
701
702         /* Presence of _PS0|_PR0 indicates 'power manageable' */
703         status = acpi_get_handle(device->handle, "_PS0", &temp);
704         if (ACPI_FAILURE(status))
705                 status = acpi_get_handle(device->handle, "_PR0", &temp);
706         if (ACPI_SUCCESS(status))
707                 device->flags.power_manageable = 1;
708
709         /* Presence of _PRW indicates wake capable */
710         status = acpi_get_handle(device->handle, "_PRW", &temp);
711         if (ACPI_SUCCESS(status))
712                 device->flags.wake_capable = 1;
713
714         /* TBD: Peformance management */
715
716         return 0;
717 }
718
719 static void acpi_device_get_busid(struct acpi_device *device,
720                                   acpi_handle handle, int type)
721 {
722         char bus_id[5] = { '?', 0 };
723         struct acpi_buffer buffer = { sizeof(bus_id), bus_id };
724         int i = 0;
725
726         /*
727          * Bus ID
728          * ------
729          * The device's Bus ID is simply the object name.
730          * TBD: Shouldn't this value be unique (within the ACPI namespace)?
731          */
732         switch (type) {
733         case ACPI_BUS_TYPE_SYSTEM:
734                 strcpy(device->pnp.bus_id, "ACPI");
735                 break;
736         case ACPI_BUS_TYPE_POWER_BUTTON:
737                 strcpy(device->pnp.bus_id, "PWRF");
738                 break;
739         case ACPI_BUS_TYPE_SLEEP_BUTTON:
740                 strcpy(device->pnp.bus_id, "SLPF");
741                 break;
742         default:
743                 acpi_get_name(handle, ACPI_SINGLE_NAME, &buffer);
744                 /* Clean up trailing underscores (if any) */
745                 for (i = 3; i > 1; i--) {
746                         if (bus_id[i] == '_')
747                                 bus_id[i] = '\0';
748                         else
749                                 break;
750                 }
751                 strcpy(device->pnp.bus_id, bus_id);
752                 break;
753         }
754 }
755
756 static void acpi_device_set_id(struct acpi_device *device,
757                                struct acpi_device *parent, acpi_handle handle,
758                                int type)
759 {
760         struct acpi_device_info *info;
761         struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
762         char *hid = NULL;
763         char *uid = NULL;
764         struct acpi_compatible_id_list *cid_list = NULL;
765         acpi_status status;
766
767         switch (type) {
768         case ACPI_BUS_TYPE_DEVICE:
769                 status = acpi_get_object_info(handle, &buffer);
770                 if (ACPI_FAILURE(status)) {
771                         printk("%s: Error reading device info\n", __FUNCTION__);
772                         return;
773                 }
774
775                 info = buffer.pointer;
776                 if (info->valid & ACPI_VALID_HID)
777                         hid = info->hardware_id.value;
778                 if (info->valid & ACPI_VALID_UID)
779                         uid = info->unique_id.value;
780                 if (info->valid & ACPI_VALID_CID)
781                         cid_list = &info->compatibility_id;
782                 if (info->valid & ACPI_VALID_ADR) {
783                         device->pnp.bus_address = info->address;
784                         device->flags.bus_address = 1;
785                 }
786                 break;
787         case ACPI_BUS_TYPE_POWER:
788                 hid = ACPI_POWER_HID;
789                 break;
790         case ACPI_BUS_TYPE_PROCESSOR:
791                 hid = ACPI_PROCESSOR_HID;
792                 break;
793         case ACPI_BUS_TYPE_SYSTEM:
794                 hid = ACPI_SYSTEM_HID;
795                 break;
796         case ACPI_BUS_TYPE_THERMAL:
797                 hid = ACPI_THERMAL_HID;
798                 break;
799         case ACPI_BUS_TYPE_POWER_BUTTON:
800                 hid = ACPI_BUTTON_HID_POWERF;
801                 break;
802         case ACPI_BUS_TYPE_SLEEP_BUTTON:
803                 hid = ACPI_BUTTON_HID_SLEEPF;
804                 break;
805         }
806
807         /* 
808          * \_SB
809          * ----
810          * Fix for the system root bus device -- the only root-level device.
811          */
812         if (((acpi_handle)parent == ACPI_ROOT_OBJECT) && (type == ACPI_BUS_TYPE_DEVICE)) {
813                 hid = ACPI_BUS_HID;
814                 strcpy(device->pnp.device_name, ACPI_BUS_DEVICE_NAME);
815                 strcpy(device->pnp.device_class, ACPI_BUS_CLASS);
816         }
817
818         if (hid) {
819                 strcpy(device->pnp.hardware_id, hid);
820                 device->flags.hardware_id = 1;
821         }
822         if (uid) {
823                 strcpy(device->pnp.unique_id, uid);
824                 device->flags.unique_id = 1;
825         }
826         if (cid_list) {
827                 device->pnp.cid_list = kmalloc(cid_list->size, GFP_KERNEL);
828                 if (device->pnp.cid_list)
829                         memcpy(device->pnp.cid_list, cid_list, cid_list->size);
830                 else
831                         printk(KERN_ERR "Memory allocation error\n");
832         }
833
834         acpi_os_free(buffer.pointer);
835 }
836
837 static int acpi_device_set_context(struct acpi_device *device, int type)
838 {
839         acpi_status status = AE_OK;
840         int result = 0;
841         /*
842          * Context
843          * -------
844          * Attach this 'struct acpi_device' to the ACPI object.  This makes
845          * resolutions from handle->device very efficient.  Note that we need
846          * to be careful with fixed-feature devices as they all attach to the
847          * root object.
848          */
849         if (type != ACPI_BUS_TYPE_POWER_BUTTON &&
850             type != ACPI_BUS_TYPE_SLEEP_BUTTON) {
851                 status = acpi_attach_data(device->handle,
852                                           acpi_bus_data_handler, device);
853
854                 if (ACPI_FAILURE(status)) {
855                         printk("Error attaching device data\n");
856                         result = -ENODEV;
857                 }
858         }
859         return result;
860 }
861
862 static void acpi_device_get_debug_info(struct acpi_device *device,
863                                        acpi_handle handle, int type)
864 {
865 #ifdef CONFIG_ACPI_DEBUG_OUTPUT
866         char *type_string = NULL;
867         char name[80] = { '?', '\0' };
868         struct acpi_buffer buffer = { sizeof(name), name };
869
870         switch (type) {
871         case ACPI_BUS_TYPE_DEVICE:
872                 type_string = "Device";
873                 acpi_get_name(handle, ACPI_FULL_PATHNAME, &buffer);
874                 break;
875         case ACPI_BUS_TYPE_POWER:
876                 type_string = "Power Resource";
877                 acpi_get_name(handle, ACPI_FULL_PATHNAME, &buffer);
878                 break;
879         case ACPI_BUS_TYPE_PROCESSOR:
880                 type_string = "Processor";
881                 acpi_get_name(handle, ACPI_FULL_PATHNAME, &buffer);
882                 break;
883         case ACPI_BUS_TYPE_SYSTEM:
884                 type_string = "System";
885                 acpi_get_name(handle, ACPI_FULL_PATHNAME, &buffer);
886                 break;
887         case ACPI_BUS_TYPE_THERMAL:
888                 type_string = "Thermal Zone";
889                 acpi_get_name(handle, ACPI_FULL_PATHNAME, &buffer);
890                 break;
891         case ACPI_BUS_TYPE_POWER_BUTTON:
892                 type_string = "Power Button";
893                 sprintf(name, "PWRB");
894                 break;
895         case ACPI_BUS_TYPE_SLEEP_BUTTON:
896                 type_string = "Sleep Button";
897                 sprintf(name, "SLPB");
898                 break;
899         }
900
901         printk(KERN_DEBUG "Found %s %s [%p]\n", type_string, name, handle);
902 #endif                          /*CONFIG_ACPI_DEBUG_OUTPUT */
903 }
904
905 static int acpi_bus_remove(struct acpi_device *dev, int rmdevice)
906 {
907         int result = 0;
908         struct acpi_driver *driver;
909
910
911         if (!dev)
912                 return -EINVAL;
913
914         driver = dev->driver;
915
916         if ((driver) && (driver->ops.remove)) {
917
918                 if (driver->ops.stop) {
919                         result = driver->ops.stop(dev, ACPI_BUS_REMOVAL_EJECT);
920                         if (result)
921                                 return result;
922                 }
923
924                 result = dev->driver->ops.remove(dev, ACPI_BUS_REMOVAL_EJECT);
925                 if (result) {
926                         return result;
927                 }
928
929                 atomic_dec(&dev->driver->references);
930                 dev->driver = NULL;
931                 acpi_driver_data(dev) = NULL;
932         }
933
934         if (!rmdevice)
935                 return 0;
936
937         if (dev->flags.bus_address) {
938                 if ((dev->parent) && (dev->parent->ops.unbind))
939                         dev->parent->ops.unbind(dev);
940         }
941
942         acpi_device_unregister(dev, ACPI_BUS_REMOVAL_EJECT);
943
944         return 0;
945 }
946
947 static int
948 acpi_add_single_object(struct acpi_device **child,
949                        struct acpi_device *parent, acpi_handle handle, int type)
950 {
951         int result = 0;
952         struct acpi_device *device = NULL;
953
954
955         if (!child)
956                 return -EINVAL;
957
958         device = kmalloc(sizeof(struct acpi_device), GFP_KERNEL);
959         if (!device) {
960                 printk(KERN_ERR PREFIX "Memory allocation error\n");
961                 return -ENOMEM;
962         }
963         memset(device, 0, sizeof(struct acpi_device));
964
965         device->handle = handle;
966         device->parent = parent;
967
968         acpi_device_get_busid(device, handle, type);
969
970         /*
971          * Flags
972          * -----
973          * Get prior to calling acpi_bus_get_status() so we know whether
974          * or not _STA is present.  Note that we only look for object
975          * handles -- cannot evaluate objects until we know the device is
976          * present and properly initialized.
977          */
978         result = acpi_bus_get_flags(device);
979         if (result)
980                 goto end;
981
982         /*
983          * Status
984          * ------
985          * See if the device is present.  We always assume that non-Device
986          * and non-Processor objects (e.g. thermal zones, power resources,
987          * etc.) are present, functioning, etc. (at least when parent object
988          * is present).  Note that _STA has a different meaning for some
989          * objects (e.g. power resources) so we need to be careful how we use
990          * it.
991          */
992         switch (type) {
993         case ACPI_BUS_TYPE_PROCESSOR:
994         case ACPI_BUS_TYPE_DEVICE:
995                 result = acpi_bus_get_status(device);
996                 if (ACPI_FAILURE(result) || !device->status.present) {
997                         result = -ENOENT;
998                         goto end;
999                 }
1000                 break;
1001         default:
1002                 STRUCT_TO_INT(device->status) = 0x0F;
1003                 break;
1004         }
1005
1006         /*
1007          * Initialize Device
1008          * -----------------
1009          * TBD: Synch with Core's enumeration/initialization process.
1010          */
1011
1012         /*
1013          * Hardware ID, Unique ID, & Bus Address
1014          * -------------------------------------
1015          */
1016         acpi_device_set_id(device, parent, handle, type);
1017
1018         /*
1019          * Power Management
1020          * ----------------
1021          */
1022         if (device->flags.power_manageable) {
1023                 result = acpi_bus_get_power_flags(device);
1024                 if (result)
1025                         goto end;
1026         }
1027
1028         /*
1029          * Wakeup device management
1030          *-----------------------
1031          */
1032         if (device->flags.wake_capable) {
1033                 result = acpi_bus_get_wakeup_device_flags(device);
1034                 if (result)
1035                         goto end;
1036         }
1037
1038         /*
1039          * Performance Management
1040          * ----------------------
1041          */
1042         if (device->flags.performance_manageable) {
1043                 result = acpi_bus_get_perf_flags(device);
1044                 if (result)
1045                         goto end;
1046         }
1047
1048         if ((result = acpi_device_set_context(device, type)))
1049                 goto end;
1050
1051         acpi_device_get_debug_info(device, handle, type);
1052
1053         acpi_device_register(device, parent);
1054
1055         /*
1056          * Bind _ADR-Based Devices
1057          * -----------------------
1058          * If there's a a bus address (_ADR) then we utilize the parent's 
1059          * 'bind' function (if exists) to bind the ACPI- and natively-
1060          * enumerated device representations.
1061          */
1062         if (device->flags.bus_address) {
1063                 if (device->parent && device->parent->ops.bind)
1064                         device->parent->ops.bind(device);
1065         }
1066
1067         /*
1068          * Locate & Attach Driver
1069          * ----------------------
1070          * If there's a hardware id (_HID) or compatible ids (_CID) we check
1071          * to see if there's a driver installed for this kind of device.  Note
1072          * that drivers can install before or after a device is enumerated.
1073          *
1074          * TBD: Assumes LDM provides driver hot-plug capability.
1075          */
1076         acpi_bus_find_driver(device);
1077
1078       end:
1079         if (!result)
1080                 *child = device;
1081         else {
1082                 kfree(device->pnp.cid_list);
1083                 kfree(device);
1084         }
1085
1086         return result;
1087 }
1088
1089 static int acpi_bus_scan(struct acpi_device *start, struct acpi_bus_ops *ops)
1090 {
1091         acpi_status status = AE_OK;
1092         struct acpi_device *parent = NULL;
1093         struct acpi_device *child = NULL;
1094         acpi_handle phandle = NULL;
1095         acpi_handle chandle = NULL;
1096         acpi_object_type type = 0;
1097         u32 level = 1;
1098
1099
1100         if (!start)
1101                 return -EINVAL;
1102
1103         parent = start;
1104         phandle = start->handle;
1105
1106         /*
1107          * Parse through the ACPI namespace, identify all 'devices', and
1108          * create a new 'struct acpi_device' for each.
1109          */
1110         while ((level > 0) && parent) {
1111
1112                 status = acpi_get_next_object(ACPI_TYPE_ANY, phandle,
1113                                               chandle, &chandle);
1114
1115                 /*
1116                  * If this scope is exhausted then move our way back up.
1117                  */
1118                 if (ACPI_FAILURE(status)) {
1119                         level--;
1120                         chandle = phandle;
1121                         acpi_get_parent(phandle, &phandle);
1122                         if (parent->parent)
1123                                 parent = parent->parent;
1124                         continue;
1125                 }
1126
1127                 status = acpi_get_type(chandle, &type);
1128                 if (ACPI_FAILURE(status))
1129                         continue;
1130
1131                 /*
1132                  * If this is a scope object then parse it (depth-first).
1133                  */
1134                 if (type == ACPI_TYPE_LOCAL_SCOPE) {
1135                         level++;
1136                         phandle = chandle;
1137                         chandle = NULL;
1138                         continue;
1139                 }
1140
1141                 /*
1142                  * We're only interested in objects that we consider 'devices'.
1143                  */
1144                 switch (type) {
1145                 case ACPI_TYPE_DEVICE:
1146                         type = ACPI_BUS_TYPE_DEVICE;
1147                         break;
1148                 case ACPI_TYPE_PROCESSOR:
1149                         type = ACPI_BUS_TYPE_PROCESSOR;
1150                         break;
1151                 case ACPI_TYPE_THERMAL:
1152                         type = ACPI_BUS_TYPE_THERMAL;
1153                         break;
1154                 case ACPI_TYPE_POWER:
1155                         type = ACPI_BUS_TYPE_POWER;
1156                         break;
1157                 default:
1158                         continue;
1159                 }
1160
1161                 if (ops->acpi_op_add)
1162                         status = acpi_add_single_object(&child, parent,
1163                                                         chandle, type);
1164                 else
1165                         status = acpi_bus_get_device(chandle, &child);
1166
1167                 if (ACPI_FAILURE(status))
1168                         continue;
1169
1170                 if (ops->acpi_op_start) {
1171                         status = acpi_start_single_object(child);
1172                         if (ACPI_FAILURE(status))
1173                                 continue;
1174                 }
1175
1176                 /*
1177                  * If the device is present, enabled, and functioning then
1178                  * parse its scope (depth-first).  Note that we need to
1179                  * represent absent devices to facilitate PnP notifications
1180                  * -- but only the subtree head (not all of its children,
1181                  * which will be enumerated when the parent is inserted).
1182                  *
1183                  * TBD: Need notifications and other detection mechanisms
1184                  *      in place before we can fully implement this.
1185                  */
1186                 if (child->status.present) {
1187                         status = acpi_get_next_object(ACPI_TYPE_ANY, chandle,
1188                                                       NULL, NULL);
1189                         if (ACPI_SUCCESS(status)) {
1190                                 level++;
1191                                 phandle = chandle;
1192                                 chandle = NULL;
1193                                 parent = child;
1194                         }
1195                 }
1196         }
1197
1198         return 0;
1199 }
1200
1201 int
1202 acpi_bus_add(struct acpi_device **child,
1203              struct acpi_device *parent, acpi_handle handle, int type)
1204 {
1205         int result;
1206         struct acpi_bus_ops ops;
1207
1208
1209         result = acpi_add_single_object(child, parent, handle, type);
1210         if (!result) {
1211                 memset(&ops, 0, sizeof(ops));
1212                 ops.acpi_op_add = 1;
1213                 result = acpi_bus_scan(*child, &ops);
1214         }
1215         return result;
1216 }
1217
1218 EXPORT_SYMBOL(acpi_bus_add);
1219
1220 int acpi_bus_start(struct acpi_device *device)
1221 {
1222         int result;
1223         struct acpi_bus_ops ops;
1224
1225
1226         if (!device)
1227                 return -EINVAL;
1228
1229         result = acpi_start_single_object(device);
1230         if (!result) {
1231                 memset(&ops, 0, sizeof(ops));
1232                 ops.acpi_op_start = 1;
1233                 result = acpi_bus_scan(device, &ops);
1234         }
1235         return result;
1236 }
1237
1238 EXPORT_SYMBOL(acpi_bus_start);
1239
1240 int acpi_bus_trim(struct acpi_device *start, int rmdevice)
1241 {
1242         acpi_status status;
1243         struct acpi_device *parent, *child;
1244         acpi_handle phandle, chandle;
1245         acpi_object_type type;
1246         u32 level = 1;
1247         int err = 0;
1248
1249         parent = start;
1250         phandle = start->handle;
1251         child = chandle = NULL;
1252
1253         while ((level > 0) && parent && (!err)) {
1254                 status = acpi_get_next_object(ACPI_TYPE_ANY, phandle,
1255                                               chandle, &chandle);
1256
1257                 /*
1258                  * If this scope is exhausted then move our way back up.
1259                  */
1260                 if (ACPI_FAILURE(status)) {
1261                         level--;
1262                         chandle = phandle;
1263                         acpi_get_parent(phandle, &phandle);
1264                         child = parent;
1265                         parent = parent->parent;
1266
1267                         if (level == 0)
1268                                 err = acpi_bus_remove(child, rmdevice);
1269                         else
1270                                 err = acpi_bus_remove(child, 1);
1271
1272                         continue;
1273                 }
1274
1275                 status = acpi_get_type(chandle, &type);
1276                 if (ACPI_FAILURE(status)) {
1277                         continue;
1278                 }
1279                 /*
1280                  * If there is a device corresponding to chandle then
1281                  * parse it (depth-first).
1282                  */
1283                 if (acpi_bus_get_device(chandle, &child) == 0) {
1284                         level++;
1285                         phandle = chandle;
1286                         chandle = NULL;
1287                         parent = child;
1288                 }
1289                 continue;
1290         }
1291         return err;
1292 }
1293 EXPORT_SYMBOL_GPL(acpi_bus_trim);
1294
1295
1296 static int acpi_bus_scan_fixed(struct acpi_device *root)
1297 {
1298         int result = 0;
1299         struct acpi_device *device = NULL;
1300
1301
1302         if (!root)
1303                 return -ENODEV;
1304
1305         /*
1306          * Enumerate all fixed-feature devices.
1307          */
1308         if (acpi_fadt.pwr_button == 0) {
1309                 result = acpi_add_single_object(&device, acpi_root,
1310                                                 NULL,
1311                                                 ACPI_BUS_TYPE_POWER_BUTTON);
1312                 if (!result)
1313                         result = acpi_start_single_object(device);
1314         }
1315
1316         if (acpi_fadt.sleep_button == 0) {
1317                 result = acpi_add_single_object(&device, acpi_root,
1318                                                 NULL,
1319                                                 ACPI_BUS_TYPE_SLEEP_BUTTON);
1320                 if (!result)
1321                         result = acpi_start_single_object(device);
1322         }
1323
1324         return result;
1325 }
1326
1327
1328 static inline struct acpi_device * to_acpi_dev(struct device * dev)
1329 {
1330         return container_of(dev, struct acpi_device, dev);
1331 }
1332
1333
1334 static int root_suspend(struct acpi_device * acpi_dev, pm_message_t state)
1335 {
1336         struct acpi_device * dev, * next;
1337         int result;
1338
1339         spin_lock(&acpi_device_lock);
1340         list_for_each_entry_safe_reverse(dev, next, &acpi_device_list, g_list) {
1341                 if (dev->driver && dev->driver->ops.suspend) {
1342                         spin_unlock(&acpi_device_lock);
1343                         result = dev->driver->ops.suspend(dev, 0);
1344                         if (result) {
1345                                 printk(KERN_ERR PREFIX "[%s - %s] Suspend failed: %d\n",
1346                                        acpi_device_name(dev),
1347                                        acpi_device_bid(dev), result);
1348                         }
1349                         spin_lock(&acpi_device_lock);
1350                 }
1351         }
1352         spin_unlock(&acpi_device_lock);
1353         return 0;
1354 }
1355
1356
1357 static int acpi_device_suspend(struct device * dev, pm_message_t state)
1358 {
1359         struct acpi_device * acpi_dev = to_acpi_dev(dev);
1360
1361         /*
1362          * For now, we should only register 1 generic device -
1363          * the ACPI root device - and from there, we walk the
1364          * tree of ACPI devices to suspend each one using the
1365          * ACPI driver methods.
1366          */
1367         if (acpi_dev->handle == ACPI_ROOT_OBJECT)
1368                 root_suspend(acpi_dev, state);
1369         return 0;
1370 }
1371
1372
1373
1374 static int root_resume(struct acpi_device * acpi_dev)
1375 {
1376         struct acpi_device * dev, * next;
1377         int result;
1378
1379         spin_lock(&acpi_device_lock);
1380         list_for_each_entry_safe(dev, next, &acpi_device_list, g_list) {
1381                 if (dev->driver && dev->driver->ops.resume) {
1382                         spin_unlock(&acpi_device_lock);
1383                         result = dev->driver->ops.resume(dev, 0);
1384                         if (result) {
1385                                 printk(KERN_ERR PREFIX "[%s - %s] resume failed: %d\n",
1386                                        acpi_device_name(dev),
1387                                        acpi_device_bid(dev), result);
1388                         }
1389                         spin_lock(&acpi_device_lock);
1390                 }
1391         }
1392         spin_unlock(&acpi_device_lock);
1393         return 0;
1394 }
1395
1396
1397 static int acpi_device_resume(struct device * dev)
1398 {
1399         struct acpi_device * acpi_dev = to_acpi_dev(dev);
1400
1401         /*
1402          * For now, we should only register 1 generic device -
1403          * the ACPI root device - and from there, we walk the
1404          * tree of ACPI devices to resume each one using the
1405          * ACPI driver methods.
1406          */
1407         if (acpi_dev->handle == ACPI_ROOT_OBJECT)
1408                 root_resume(acpi_dev);
1409         return 0;
1410 }
1411
1412
1413 struct bus_type acpi_bus_type = {
1414         .name           = "acpi",
1415         .suspend        = acpi_device_suspend,
1416         .resume         = acpi_device_resume,
1417 };
1418
1419
1420
1421 static int __init acpi_scan_init(void)
1422 {
1423         int result;
1424         struct acpi_bus_ops ops;
1425
1426
1427         if (acpi_disabled)
1428                 return 0;
1429
1430         kset_register(&acpi_namespace_kset);
1431
1432         result = bus_register(&acpi_bus_type);
1433         if (result) {
1434                 /* We don't want to quit even if we failed to add suspend/resume */
1435                 printk(KERN_ERR PREFIX "Could not register bus type\n");
1436         }
1437
1438         /*
1439          * Create the root device in the bus's device tree
1440          */
1441         result = acpi_add_single_object(&acpi_root, NULL, ACPI_ROOT_OBJECT,
1442                                         ACPI_BUS_TYPE_SYSTEM);
1443         if (result)
1444                 goto Done;
1445
1446         result = acpi_start_single_object(acpi_root);
1447         if (result)
1448                 goto Done;
1449
1450         acpi_root->dev.bus = &acpi_bus_type;
1451         snprintf(acpi_root->dev.bus_id, BUS_ID_SIZE, "%s", acpi_bus_type.name);
1452         result = device_register(&acpi_root->dev);
1453         if (result) {
1454                 /* We don't want to quit even if we failed to add suspend/resume */
1455                 printk(KERN_ERR PREFIX "Could not register device\n");
1456         }
1457
1458         /*
1459          * Enumerate devices in the ACPI namespace.
1460          */
1461         result = acpi_bus_scan_fixed(acpi_root);
1462         if (!result) {
1463                 memset(&ops, 0, sizeof(ops));
1464                 ops.acpi_op_add = 1;
1465                 ops.acpi_op_start = 1;
1466                 result = acpi_bus_scan(acpi_root, &ops);
1467         }
1468
1469         if (result)
1470                 acpi_device_unregister(acpi_root, ACPI_BUS_REMOVAL_NORMAL);
1471
1472       Done:
1473         return result;
1474 }
1475
1476 subsys_initcall(acpi_scan_init);