ACPI: sbs: remove dead code
[linux-3.10.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/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 int create_modalias(struct acpi_device *acpi_dev, char *modalias, int size){
39
40         int len;
41
42         if (!acpi_dev->flags.hardware_id)
43                 return -ENODEV;
44
45         len = snprintf(modalias, size, "acpi:%s:",
46                        acpi_dev->pnp.hardware_id);
47         if (len < 0 || len >= size)
48                 return -EINVAL;
49         size -= len;
50
51         if (acpi_dev->flags.compatible_ids) {
52                 struct acpi_compatible_id_list *cid_list;
53                 int i;
54                 int count;
55
56                 cid_list = acpi_dev->pnp.cid_list;
57                 for (i = 0; i < cid_list->count; i++) {
58                         count = snprintf(&modalias[len], size, "%s:",
59                                          cid_list->id[i].value);
60                         if (count < 0 || count >= size) {
61                                 printk(KERN_ERR "acpi: %s cid[%i] exceeds event buffer size",
62                                        acpi_dev->pnp.device_name, i);
63                                 break;
64                         }
65                         len += count;
66                         size -= count;
67                 }
68         }
69
70         modalias[len] = '\0';
71         return len;
72 }
73
74 static ssize_t
75 acpi_device_modalias_show(struct device *dev, struct device_attribute *attr, char *buf) {
76         struct acpi_device *acpi_dev = to_acpi_device(dev);
77         int len;
78
79         /* Device has no HID and no CID or string is >1024 */
80         len = create_modalias(acpi_dev, buf, 1024);
81         if (len <= 0)
82                 return 0;
83         buf[len++] = '\n';
84         return len;
85 }
86 static DEVICE_ATTR(modalias, 0444, acpi_device_modalias_show, NULL);
87
88 static int acpi_eject_operation(acpi_handle handle, int lockable)
89 {
90         struct acpi_object_list arg_list;
91         union acpi_object arg;
92         acpi_status status = AE_OK;
93
94         /*
95          * TBD: evaluate _PS3?
96          */
97
98         if (lockable) {
99                 arg_list.count = 1;
100                 arg_list.pointer = &arg;
101                 arg.type = ACPI_TYPE_INTEGER;
102                 arg.integer.value = 0;
103                 acpi_evaluate_object(handle, "_LCK", &arg_list, NULL);
104         }
105
106         arg_list.count = 1;
107         arg_list.pointer = &arg;
108         arg.type = ACPI_TYPE_INTEGER;
109         arg.integer.value = 1;
110
111         /*
112          * TBD: _EJD support.
113          */
114
115         status = acpi_evaluate_object(handle, "_EJ0", &arg_list, NULL);
116         if (ACPI_FAILURE(status)) {
117                 return (-ENODEV);
118         }
119
120         return (0);
121 }
122
123 static ssize_t
124 acpi_eject_store(struct device *d, struct device_attribute *attr,
125                 const char *buf, size_t count)
126 {
127         int result;
128         int ret = count;
129         int islockable;
130         acpi_status status;
131         acpi_handle handle;
132         acpi_object_type type = 0;
133         struct acpi_device *acpi_device = to_acpi_device(d);
134
135         if ((!count) || (buf[0] != '1')) {
136                 return -EINVAL;
137         }
138 #ifndef FORCE_EJECT
139         if (acpi_device->driver == NULL) {
140                 ret = -ENODEV;
141                 goto err;
142         }
143 #endif
144         status = acpi_get_type(acpi_device->handle, &type);
145         if (ACPI_FAILURE(status) || (!acpi_device->flags.ejectable)) {
146                 ret = -ENODEV;
147                 goto err;
148         }
149
150         islockable = acpi_device->flags.lockable;
151         handle = acpi_device->handle;
152
153         result = acpi_bus_trim(acpi_device, 1);
154
155         if (!result)
156                 result = acpi_eject_operation(handle, islockable);
157
158         if (result) {
159                 ret = -EBUSY;
160         }
161       err:
162         return ret;
163 }
164
165 static DEVICE_ATTR(eject, 0200, NULL, acpi_eject_store);
166
167 static ssize_t
168 acpi_device_hid_show(struct device *dev, struct device_attribute *attr, char *buf) {
169         struct acpi_device *acpi_dev = to_acpi_device(dev);
170
171         return sprintf(buf, "%s\n", acpi_dev->pnp.hardware_id);
172 }
173 static DEVICE_ATTR(hid, 0444, acpi_device_hid_show, NULL);
174
175 static ssize_t
176 acpi_device_path_show(struct device *dev, struct device_attribute *attr, char *buf) {
177         struct acpi_device *acpi_dev = to_acpi_device(dev);
178         struct acpi_buffer path = {ACPI_ALLOCATE_BUFFER, NULL};
179         int result;
180
181         result = acpi_get_name(acpi_dev->handle, ACPI_FULL_PATHNAME, &path);
182         if(result)
183                 goto end;
184
185         result = sprintf(buf, "%s\n", (char*)path.pointer);
186         kfree(path.pointer);
187   end:
188         return result;
189 }
190 static DEVICE_ATTR(path, 0444, acpi_device_path_show, NULL);
191
192 static int acpi_device_setup_files(struct acpi_device *dev)
193 {
194         acpi_status status;
195         acpi_handle temp;
196         int result = 0;
197
198         /*
199          * Devices gotten from FADT don't have a "path" attribute
200          */
201         if(dev->handle) {
202                 result = device_create_file(&dev->dev, &dev_attr_path);
203                 if(result)
204                         goto end;
205         }
206
207         if(dev->flags.hardware_id) {
208                 result = device_create_file(&dev->dev, &dev_attr_hid);
209                 if(result)
210                         goto end;
211         }
212
213         if (dev->flags.hardware_id || dev->flags.compatible_ids){
214                 result = device_create_file(&dev->dev, &dev_attr_modalias);
215                 if(result)
216                         goto end;
217         }
218
219         /*
220          * If device has _EJ0, 'eject' file is created that is used to trigger
221          * hot-removal function from userland.
222          */
223         status = acpi_get_handle(dev->handle, "_EJ0", &temp);
224         if (ACPI_SUCCESS(status))
225                 result = device_create_file(&dev->dev, &dev_attr_eject);
226   end:
227         return result;
228 }
229
230 static void acpi_device_remove_files(struct acpi_device *dev)
231 {
232         acpi_status status;
233         acpi_handle temp;
234
235         /*
236          * If device has _EJ0, 'eject' file is created that is used to trigger
237          * hot-removal function from userland.
238          */
239         status = acpi_get_handle(dev->handle, "_EJ0", &temp);
240         if (ACPI_SUCCESS(status))
241                 device_remove_file(&dev->dev, &dev_attr_eject);
242
243         if (dev->flags.hardware_id || dev->flags.compatible_ids)
244                 device_remove_file(&dev->dev, &dev_attr_modalias);
245
246         if(dev->flags.hardware_id)
247                 device_remove_file(&dev->dev, &dev_attr_hid);
248         if(dev->handle)
249                 device_remove_file(&dev->dev, &dev_attr_path);
250 }
251 /* --------------------------------------------------------------------------
252                         ACPI Bus operations
253    -------------------------------------------------------------------------- */
254
255 int acpi_match_device_ids(struct acpi_device *device,
256                           const struct acpi_device_id *ids)
257 {
258         const struct acpi_device_id *id;
259
260         if (device->flags.hardware_id) {
261                 for (id = ids; id->id[0]; id++) {
262                         if (!strcmp((char*)id->id, device->pnp.hardware_id))
263                                 return 0;
264                 }
265         }
266
267         if (device->flags.compatible_ids) {
268                 struct acpi_compatible_id_list *cid_list = device->pnp.cid_list;
269                 int i;
270
271                 for (id = ids; id->id[0]; id++) {
272                         /* compare multiple _CID entries against driver ids */
273                         for (i = 0; i < cid_list->count; i++) {
274                                 if (!strcmp((char*)id->id,
275                                             cid_list->id[i].value))
276                                         return 0;
277                         }
278                 }
279         }
280
281         return -ENOENT;
282 }
283 EXPORT_SYMBOL(acpi_match_device_ids);
284
285 static void acpi_device_release(struct device *dev)
286 {
287         struct acpi_device *acpi_dev = to_acpi_device(dev);
288
289         kfree(acpi_dev->pnp.cid_list);
290         kfree(acpi_dev);
291 }
292
293 static int acpi_device_suspend(struct device *dev, pm_message_t state)
294 {
295         struct acpi_device *acpi_dev = to_acpi_device(dev);
296         struct acpi_driver *acpi_drv = acpi_dev->driver;
297
298         if (acpi_drv && acpi_drv->ops.suspend)
299                 return acpi_drv->ops.suspend(acpi_dev, state);
300         return 0;
301 }
302
303 static int acpi_device_resume(struct device *dev)
304 {
305         struct acpi_device *acpi_dev = to_acpi_device(dev);
306         struct acpi_driver *acpi_drv = acpi_dev->driver;
307
308         if (acpi_drv && acpi_drv->ops.resume)
309                 return acpi_drv->ops.resume(acpi_dev);
310         return 0;
311 }
312
313 static int acpi_bus_match(struct device *dev, struct device_driver *drv)
314 {
315         struct acpi_device *acpi_dev = to_acpi_device(dev);
316         struct acpi_driver *acpi_drv = to_acpi_driver(drv);
317
318         return !acpi_match_device_ids(acpi_dev, acpi_drv->ids);
319 }
320
321 static int acpi_device_uevent(struct device *dev, char **envp, int num_envp,
322                               char *buffer, int buffer_size)
323 {
324         struct acpi_device *acpi_dev = to_acpi_device(dev);
325
326         strcpy(buffer, "MODALIAS=");
327         if (create_modalias(acpi_dev, buffer + 9, buffer_size - 9) > 0) {
328                 envp[0] = buffer;
329                 envp[1] = NULL;
330         }
331         return 0;
332 }
333
334 static int acpi_bus_driver_init(struct acpi_device *, struct acpi_driver *);
335 static int acpi_start_single_object(struct acpi_device *);
336 static int acpi_device_probe(struct device * dev)
337 {
338         struct acpi_device *acpi_dev = to_acpi_device(dev);
339         struct acpi_driver *acpi_drv = to_acpi_driver(dev->driver);
340         int ret;
341
342         ret = acpi_bus_driver_init(acpi_dev, acpi_drv);
343         if (!ret) {
344                 if (acpi_dev->bus_ops.acpi_op_start)
345                         acpi_start_single_object(acpi_dev);
346                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
347                         "Found driver [%s] for device [%s]\n",
348                         acpi_drv->name, acpi_dev->pnp.bus_id));
349                 get_device(dev);
350         }
351         return ret;
352 }
353
354 static int acpi_device_remove(struct device * dev)
355 {
356         struct acpi_device *acpi_dev = to_acpi_device(dev);
357         struct acpi_driver *acpi_drv = acpi_dev->driver;
358
359         if (acpi_drv) {
360                 if (acpi_drv->ops.stop)
361                         acpi_drv->ops.stop(acpi_dev, acpi_dev->removal_type);
362                 if (acpi_drv->ops.remove)
363                         acpi_drv->ops.remove(acpi_dev, acpi_dev->removal_type);
364         }
365         acpi_dev->driver = NULL;
366         acpi_driver_data(dev) = NULL;
367
368         put_device(dev);
369         return 0;
370 }
371
372 static void acpi_device_shutdown(struct device *dev)
373 {
374         struct acpi_device *acpi_dev = to_acpi_device(dev);
375         struct acpi_driver *acpi_drv = acpi_dev->driver;
376
377         if (acpi_drv && acpi_drv->ops.shutdown)
378                 acpi_drv->ops.shutdown(acpi_dev);
379
380         return ;
381 }
382
383 struct bus_type acpi_bus_type = {
384         .name           = "acpi",
385         .suspend        = acpi_device_suspend,
386         .resume         = acpi_device_resume,
387         .shutdown       = acpi_device_shutdown,
388         .match          = acpi_bus_match,
389         .probe          = acpi_device_probe,
390         .remove         = acpi_device_remove,
391         .uevent         = acpi_device_uevent,
392 };
393
394 static int acpi_device_register(struct acpi_device *device,
395                                  struct acpi_device *parent)
396 {
397         int result;
398         struct acpi_device_bus_id *acpi_device_bus_id, *new_bus_id;
399         int found = 0;
400         /*
401          * Linkage
402          * -------
403          * Link this device to its parent and siblings.
404          */
405         INIT_LIST_HEAD(&device->children);
406         INIT_LIST_HEAD(&device->node);
407         INIT_LIST_HEAD(&device->g_list);
408         INIT_LIST_HEAD(&device->wakeup_list);
409
410         new_bus_id = kzalloc(sizeof(struct acpi_device_bus_id), GFP_KERNEL);
411         if (!new_bus_id) {
412                 printk(KERN_ERR PREFIX "Memory allocation error\n");
413                 return -ENOMEM;
414         }
415
416         spin_lock(&acpi_device_lock);
417         /*
418          * Find suitable bus_id and instance number in acpi_bus_id_list
419          * If failed, create one and link it into acpi_bus_id_list
420          */
421         list_for_each_entry(acpi_device_bus_id, &acpi_bus_id_list, node) {
422                 if(!strcmp(acpi_device_bus_id->bus_id, device->flags.hardware_id? device->pnp.hardware_id : "device")) {
423                         acpi_device_bus_id->instance_no ++;
424                         found = 1;
425                         kfree(new_bus_id);
426                         break;
427                 }
428         }
429         if(!found) {
430                 acpi_device_bus_id = new_bus_id;
431                 strcpy(acpi_device_bus_id->bus_id, device->flags.hardware_id ? device->pnp.hardware_id : "device");
432                 acpi_device_bus_id->instance_no = 0;
433                 list_add_tail(&acpi_device_bus_id->node, &acpi_bus_id_list);
434         }
435         sprintf(device->dev.bus_id, "%s:%02x", acpi_device_bus_id->bus_id, acpi_device_bus_id->instance_no);
436
437         if (device->parent) {
438                 list_add_tail(&device->node, &device->parent->children);
439                 list_add_tail(&device->g_list, &device->parent->g_list);
440         } else
441                 list_add_tail(&device->g_list, &acpi_device_list);
442         if (device->wakeup.flags.valid)
443                 list_add_tail(&device->wakeup_list, &acpi_wakeup_device_list);
444         spin_unlock(&acpi_device_lock);
445
446         if (device->parent)
447                 device->dev.parent = &parent->dev;
448         device->dev.bus = &acpi_bus_type;
449         device_initialize(&device->dev);
450         device->dev.release = &acpi_device_release;
451         result = device_add(&device->dev);
452         if(result) {
453                 printk("Error adding device %s", device->dev.bus_id);
454                 goto end;
455         }
456
457         result = acpi_device_setup_files(device);
458         if(result)
459                 ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "Error creating sysfs interface for device %s\n", device->dev.bus_id));
460
461         device->removal_type = ACPI_BUS_REMOVAL_NORMAL;
462         return 0;
463   end:
464         spin_lock(&acpi_device_lock);
465         if (device->parent) {
466                 list_del(&device->node);
467                 list_del(&device->g_list);
468         } else
469                 list_del(&device->g_list);
470         list_del(&device->wakeup_list);
471         spin_unlock(&acpi_device_lock);
472         return result;
473 }
474
475 static void acpi_device_unregister(struct acpi_device *device, int type)
476 {
477         spin_lock(&acpi_device_lock);
478         if (device->parent) {
479                 list_del(&device->node);
480                 list_del(&device->g_list);
481         } else
482                 list_del(&device->g_list);
483
484         list_del(&device->wakeup_list);
485         spin_unlock(&acpi_device_lock);
486
487         acpi_detach_data(device->handle, acpi_bus_data_handler);
488
489         acpi_device_remove_files(device);
490         device_unregister(&device->dev);
491 }
492
493 /* --------------------------------------------------------------------------
494                                  Driver Management
495    -------------------------------------------------------------------------- */
496 /**
497  * acpi_bus_driver_init - add a device to a driver
498  * @device: the device to add and initialize
499  * @driver: driver for the device
500  *
501  * Used to initialize a device via its device driver.  Called whenever a 
502  * driver is bound to a device.  Invokes the driver's add() ops.
503  */
504 static int
505 acpi_bus_driver_init(struct acpi_device *device, struct acpi_driver *driver)
506 {
507         int result = 0;
508
509
510         if (!device || !driver)
511                 return -EINVAL;
512
513         if (!driver->ops.add)
514                 return -ENOSYS;
515
516         result = driver->ops.add(device);
517         if (result) {
518                 device->driver = NULL;
519                 acpi_driver_data(device) = NULL;
520                 return result;
521         }
522
523         device->driver = driver;
524
525         /*
526          * TBD - Configuration Management: Assign resources to device based
527          * upon possible configuration and currently allocated resources.
528          */
529
530         ACPI_DEBUG_PRINT((ACPI_DB_INFO,
531                           "Driver successfully bound to device\n"));
532         return 0;
533 }
534
535 static int acpi_start_single_object(struct acpi_device *device)
536 {
537         int result = 0;
538         struct acpi_driver *driver;
539
540
541         if (!(driver = device->driver))
542                 return 0;
543
544         if (driver->ops.start) {
545                 result = driver->ops.start(device);
546                 if (result && driver->ops.remove)
547                         driver->ops.remove(device, ACPI_BUS_REMOVAL_NORMAL);
548         }
549
550         return result;
551 }
552
553 /**
554  * acpi_bus_register_driver - register a driver with the ACPI bus
555  * @driver: driver being registered
556  *
557  * Registers a driver with the ACPI bus.  Searches the namespace for all
558  * devices that match the driver's criteria and binds.  Returns zero for
559  * success or a negative error status for failure.
560  */
561 int acpi_bus_register_driver(struct acpi_driver *driver)
562 {
563         int ret;
564
565         if (acpi_disabled)
566                 return -ENODEV;
567         driver->drv.name = driver->name;
568         driver->drv.bus = &acpi_bus_type;
569         driver->drv.owner = driver->owner;
570
571         ret = driver_register(&driver->drv);
572         return ret;
573 }
574
575 EXPORT_SYMBOL(acpi_bus_register_driver);
576
577 /**
578  * acpi_bus_unregister_driver - unregisters a driver with the APIC bus
579  * @driver: driver to unregister
580  *
581  * Unregisters a driver with the ACPI bus.  Searches the namespace for all
582  * devices that match the driver's criteria and unbinds.
583  */
584 void acpi_bus_unregister_driver(struct acpi_driver *driver)
585 {
586         driver_unregister(&driver->drv);
587 }
588
589 EXPORT_SYMBOL(acpi_bus_unregister_driver);
590
591 /* --------------------------------------------------------------------------
592                                  Device Enumeration
593    -------------------------------------------------------------------------- */
594 acpi_status
595 acpi_bus_get_ejd(acpi_handle handle, acpi_handle *ejd)
596 {
597         acpi_status status;
598         acpi_handle tmp;
599         struct acpi_buffer buffer = {ACPI_ALLOCATE_BUFFER, NULL};
600         union acpi_object *obj;
601
602         status = acpi_get_handle(handle, "_EJD", &tmp);
603         if (ACPI_FAILURE(status))
604                 return status;
605
606         status = acpi_evaluate_object(handle, "_EJD", NULL, &buffer);
607         if (ACPI_SUCCESS(status)) {
608                 obj = buffer.pointer;
609                 status = acpi_get_handle(NULL, obj->string.pointer, ejd);
610                 kfree(buffer.pointer);
611         }
612         return status;
613 }
614 EXPORT_SYMBOL_GPL(acpi_bus_get_ejd);
615
616 void acpi_bus_data_handler(acpi_handle handle, u32 function, void *context)
617 {
618
619         /* TBD */
620
621         return;
622 }
623
624 static int acpi_bus_get_perf_flags(struct acpi_device *device)
625 {
626         device->performance.state = ACPI_STATE_UNKNOWN;
627         return 0;
628 }
629
630 static acpi_status
631 acpi_bus_extract_wakeup_device_power_package(struct acpi_device *device,
632                                              union acpi_object *package)
633 {
634         int i = 0;
635         union acpi_object *element = NULL;
636
637         if (!device || !package || (package->package.count < 2))
638                 return AE_BAD_PARAMETER;
639
640         element = &(package->package.elements[0]);
641         if (!element)
642                 return AE_BAD_PARAMETER;
643         if (element->type == ACPI_TYPE_PACKAGE) {
644                 if ((element->package.count < 2) ||
645                     (element->package.elements[0].type !=
646                      ACPI_TYPE_LOCAL_REFERENCE)
647                     || (element->package.elements[1].type != ACPI_TYPE_INTEGER))
648                         return AE_BAD_DATA;
649                 device->wakeup.gpe_device =
650                     element->package.elements[0].reference.handle;
651                 device->wakeup.gpe_number =
652                     (u32) element->package.elements[1].integer.value;
653         } else if (element->type == ACPI_TYPE_INTEGER) {
654                 device->wakeup.gpe_number = element->integer.value;
655         } else
656                 return AE_BAD_DATA;
657
658         element = &(package->package.elements[1]);
659         if (element->type != ACPI_TYPE_INTEGER) {
660                 return AE_BAD_DATA;
661         }
662         device->wakeup.sleep_state = element->integer.value;
663
664         if ((package->package.count - 2) > ACPI_MAX_HANDLES) {
665                 return AE_NO_MEMORY;
666         }
667         device->wakeup.resources.count = package->package.count - 2;
668         for (i = 0; i < device->wakeup.resources.count; i++) {
669                 element = &(package->package.elements[i + 2]);
670                 if (element->type != ACPI_TYPE_ANY) {
671                         return AE_BAD_DATA;
672                 }
673
674                 device->wakeup.resources.handles[i] = element->reference.handle;
675         }
676
677         return AE_OK;
678 }
679
680 static int acpi_bus_get_wakeup_device_flags(struct acpi_device *device)
681 {
682         acpi_status status = 0;
683         struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
684         union acpi_object *package = NULL;
685
686         struct acpi_device_id button_device_ids[] = {
687                 {"PNP0C0D", 0},
688                 {"PNP0C0C", 0},
689                 {"PNP0C0E", 0},
690                 {"", 0},
691         };
692
693
694         /* _PRW */
695         status = acpi_evaluate_object(device->handle, "_PRW", NULL, &buffer);
696         if (ACPI_FAILURE(status)) {
697                 ACPI_EXCEPTION((AE_INFO, status, "Evaluating _PRW"));
698                 goto end;
699         }
700
701         package = (union acpi_object *)buffer.pointer;
702         status = acpi_bus_extract_wakeup_device_power_package(device, package);
703         if (ACPI_FAILURE(status)) {
704                 ACPI_EXCEPTION((AE_INFO, status, "Extracting _PRW package"));
705                 goto end;
706         }
707
708         kfree(buffer.pointer);
709
710         device->wakeup.flags.valid = 1;
711         /* Power button, Lid switch always enable wakeup */
712         if (!acpi_match_device_ids(device, button_device_ids))
713                 device->wakeup.flags.run_wake = 1;
714
715       end:
716         if (ACPI_FAILURE(status))
717                 device->flags.wake_capable = 0;
718         return 0;
719 }
720
721 static int acpi_bus_get_power_flags(struct acpi_device *device)
722 {
723         acpi_status status = 0;
724         acpi_handle handle = NULL;
725         u32 i = 0;
726
727
728         /*
729          * Power Management Flags
730          */
731         status = acpi_get_handle(device->handle, "_PSC", &handle);
732         if (ACPI_SUCCESS(status))
733                 device->power.flags.explicit_get = 1;
734         status = acpi_get_handle(device->handle, "_IRC", &handle);
735         if (ACPI_SUCCESS(status))
736                 device->power.flags.inrush_current = 1;
737
738         /*
739          * Enumerate supported power management states
740          */
741         for (i = ACPI_STATE_D0; i <= ACPI_STATE_D3; i++) {
742                 struct acpi_device_power_state *ps = &device->power.states[i];
743                 char object_name[5] = { '_', 'P', 'R', '0' + i, '\0' };
744
745                 /* Evaluate "_PRx" to se if power resources are referenced */
746                 acpi_evaluate_reference(device->handle, object_name, NULL,
747                                         &ps->resources);
748                 if (ps->resources.count) {
749                         device->power.flags.power_resources = 1;
750                         ps->flags.valid = 1;
751                 }
752
753                 /* Evaluate "_PSx" to see if we can do explicit sets */
754                 object_name[2] = 'S';
755                 status = acpi_get_handle(device->handle, object_name, &handle);
756                 if (ACPI_SUCCESS(status)) {
757                         ps->flags.explicit_set = 1;
758                         ps->flags.valid = 1;
759                 }
760
761                 /* State is valid if we have some power control */
762                 if (ps->resources.count || ps->flags.explicit_set)
763                         ps->flags.valid = 1;
764
765                 ps->power = -1; /* Unknown - driver assigned */
766                 ps->latency = -1;       /* Unknown - driver assigned */
767         }
768
769         /* Set defaults for D0 and D3 states (always valid) */
770         device->power.states[ACPI_STATE_D0].flags.valid = 1;
771         device->power.states[ACPI_STATE_D0].power = 100;
772         device->power.states[ACPI_STATE_D3].flags.valid = 1;
773         device->power.states[ACPI_STATE_D3].power = 0;
774
775         /* TBD: System wake support and resource requirements. */
776
777         device->power.state = ACPI_STATE_UNKNOWN;
778
779         return 0;
780 }
781
782 static int acpi_bus_get_flags(struct acpi_device *device)
783 {
784         acpi_status status = AE_OK;
785         acpi_handle temp = NULL;
786
787
788         /* Presence of _STA indicates 'dynamic_status' */
789         status = acpi_get_handle(device->handle, "_STA", &temp);
790         if (ACPI_SUCCESS(status))
791                 device->flags.dynamic_status = 1;
792
793         /* Presence of _CID indicates 'compatible_ids' */
794         status = acpi_get_handle(device->handle, "_CID", &temp);
795         if (ACPI_SUCCESS(status))
796                 device->flags.compatible_ids = 1;
797
798         /* Presence of _RMV indicates 'removable' */
799         status = acpi_get_handle(device->handle, "_RMV", &temp);
800         if (ACPI_SUCCESS(status))
801                 device->flags.removable = 1;
802
803         /* Presence of _EJD|_EJ0 indicates 'ejectable' */
804         status = acpi_get_handle(device->handle, "_EJD", &temp);
805         if (ACPI_SUCCESS(status))
806                 device->flags.ejectable = 1;
807         else {
808                 status = acpi_get_handle(device->handle, "_EJ0", &temp);
809                 if (ACPI_SUCCESS(status))
810                         device->flags.ejectable = 1;
811         }
812
813         /* Presence of _LCK indicates 'lockable' */
814         status = acpi_get_handle(device->handle, "_LCK", &temp);
815         if (ACPI_SUCCESS(status))
816                 device->flags.lockable = 1;
817
818         /* Presence of _PS0|_PR0 indicates 'power manageable' */
819         status = acpi_get_handle(device->handle, "_PS0", &temp);
820         if (ACPI_FAILURE(status))
821                 status = acpi_get_handle(device->handle, "_PR0", &temp);
822         if (ACPI_SUCCESS(status))
823                 device->flags.power_manageable = 1;
824
825         /* Presence of _PRW indicates wake capable */
826         status = acpi_get_handle(device->handle, "_PRW", &temp);
827         if (ACPI_SUCCESS(status))
828                 device->flags.wake_capable = 1;
829
830         /* TBD: Peformance management */
831
832         return 0;
833 }
834
835 static void acpi_device_get_busid(struct acpi_device *device,
836                                   acpi_handle handle, int type)
837 {
838         char bus_id[5] = { '?', 0 };
839         struct acpi_buffer buffer = { sizeof(bus_id), bus_id };
840         int i = 0;
841
842         /*
843          * Bus ID
844          * ------
845          * The device's Bus ID is simply the object name.
846          * TBD: Shouldn't this value be unique (within the ACPI namespace)?
847          */
848         switch (type) {
849         case ACPI_BUS_TYPE_SYSTEM:
850                 strcpy(device->pnp.bus_id, "ACPI");
851                 break;
852         case ACPI_BUS_TYPE_POWER_BUTTON:
853                 strcpy(device->pnp.bus_id, "PWRF");
854                 break;
855         case ACPI_BUS_TYPE_SLEEP_BUTTON:
856                 strcpy(device->pnp.bus_id, "SLPF");
857                 break;
858         default:
859                 acpi_get_name(handle, ACPI_SINGLE_NAME, &buffer);
860                 /* Clean up trailing underscores (if any) */
861                 for (i = 3; i > 1; i--) {
862                         if (bus_id[i] == '_')
863                                 bus_id[i] = '\0';
864                         else
865                                 break;
866                 }
867                 strcpy(device->pnp.bus_id, bus_id);
868                 break;
869         }
870 }
871
872 static int
873 acpi_video_bus_match(struct acpi_device *device)
874 {
875         acpi_handle h_dummy1;
876         acpi_handle h_dummy2;
877         acpi_handle h_dummy3;
878
879
880         if (!device)
881                 return -EINVAL;
882
883         /* Since there is no HID, CID for ACPI Video drivers, we have
884          * to check well known required nodes for each feature we support.
885          */
886
887         /* Does this device able to support video switching ? */
888         if (ACPI_SUCCESS(acpi_get_handle(device->handle, "_DOD", &h_dummy1)) &&
889             ACPI_SUCCESS(acpi_get_handle(device->handle, "_DOS", &h_dummy2)))
890                 return 0;
891
892         /* Does this device able to retrieve a video ROM ? */
893         if (ACPI_SUCCESS(acpi_get_handle(device->handle, "_ROM", &h_dummy1)))
894                 return 0;
895
896         /* Does this device able to configure which video head to be POSTed ? */
897         if (ACPI_SUCCESS(acpi_get_handle(device->handle, "_VPO", &h_dummy1)) &&
898             ACPI_SUCCESS(acpi_get_handle(device->handle, "_GPD", &h_dummy2)) &&
899             ACPI_SUCCESS(acpi_get_handle(device->handle, "_SPD", &h_dummy3)))
900                 return 0;
901
902         return -ENODEV;
903 }
904
905 /*
906  * acpi_bay_match - see if a device is an ejectable driver bay
907  *
908  * If an acpi object is ejectable and has one of the ACPI ATA methods defined,
909  * then we can safely call it an ejectable drive bay
910  */
911 static int acpi_bay_match(struct acpi_device *device){
912         acpi_status status;
913         acpi_handle handle;
914         acpi_handle tmp;
915         acpi_handle phandle;
916
917         handle = device->handle;
918
919         status = acpi_get_handle(handle, "_EJ0", &tmp);
920         if (ACPI_FAILURE(status))
921                 return -ENODEV;
922
923         if ((ACPI_SUCCESS(acpi_get_handle(handle, "_GTF", &tmp))) ||
924                 (ACPI_SUCCESS(acpi_get_handle(handle, "_GTM", &tmp))) ||
925                 (ACPI_SUCCESS(acpi_get_handle(handle, "_STM", &tmp))) ||
926                 (ACPI_SUCCESS(acpi_get_handle(handle, "_SDD", &tmp))))
927                 return 0;
928
929         if (acpi_get_parent(handle, &phandle))
930                 return -ENODEV;
931
932         if ((ACPI_SUCCESS(acpi_get_handle(phandle, "_GTF", &tmp))) ||
933                 (ACPI_SUCCESS(acpi_get_handle(phandle, "_GTM", &tmp))) ||
934                 (ACPI_SUCCESS(acpi_get_handle(phandle, "_STM", &tmp))) ||
935                 (ACPI_SUCCESS(acpi_get_handle(phandle, "_SDD", &tmp))))
936                 return 0;
937
938         return -ENODEV;
939 }
940
941 static void acpi_device_set_id(struct acpi_device *device,
942                                struct acpi_device *parent, acpi_handle handle,
943                                int type)
944 {
945         struct acpi_device_info *info;
946         struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
947         char *hid = NULL;
948         char *uid = NULL;
949         struct acpi_compatible_id_list *cid_list = NULL;
950         acpi_status status;
951
952         switch (type) {
953         case ACPI_BUS_TYPE_DEVICE:
954                 status = acpi_get_object_info(handle, &buffer);
955                 if (ACPI_FAILURE(status)) {
956                         printk("%s: Error reading device info\n", __FUNCTION__);
957                         return;
958                 }
959
960                 info = buffer.pointer;
961                 if (info->valid & ACPI_VALID_HID)
962                         hid = info->hardware_id.value;
963                 if (info->valid & ACPI_VALID_UID)
964                         uid = info->unique_id.value;
965                 if (info->valid & ACPI_VALID_CID)
966                         cid_list = &info->compatibility_id;
967                 if (info->valid & ACPI_VALID_ADR) {
968                         device->pnp.bus_address = info->address;
969                         device->flags.bus_address = 1;
970                 }
971
972                 if(!(info->valid & (ACPI_VALID_HID | ACPI_VALID_CID))){
973                         status = acpi_video_bus_match(device);
974                         if(ACPI_SUCCESS(status))
975                                 hid = ACPI_VIDEO_HID;
976
977                         status = acpi_bay_match(device);
978                         if (ACPI_SUCCESS(status))
979                                 hid = ACPI_BAY_HID;
980                 }
981                 break;
982         case ACPI_BUS_TYPE_POWER:
983                 hid = ACPI_POWER_HID;
984                 break;
985         case ACPI_BUS_TYPE_PROCESSOR:
986                 hid = ACPI_PROCESSOR_HID;
987                 break;
988         case ACPI_BUS_TYPE_SYSTEM:
989                 hid = ACPI_SYSTEM_HID;
990                 break;
991         case ACPI_BUS_TYPE_THERMAL:
992                 hid = ACPI_THERMAL_HID;
993                 break;
994         case ACPI_BUS_TYPE_POWER_BUTTON:
995                 hid = ACPI_BUTTON_HID_POWERF;
996                 break;
997         case ACPI_BUS_TYPE_SLEEP_BUTTON:
998                 hid = ACPI_BUTTON_HID_SLEEPF;
999                 break;
1000         }
1001
1002         /* 
1003          * \_SB
1004          * ----
1005          * Fix for the system root bus device -- the only root-level device.
1006          */
1007         if (((acpi_handle)parent == ACPI_ROOT_OBJECT) && (type == ACPI_BUS_TYPE_DEVICE)) {
1008                 hid = ACPI_BUS_HID;
1009                 strcpy(device->pnp.device_name, ACPI_BUS_DEVICE_NAME);
1010                 strcpy(device->pnp.device_class, ACPI_BUS_CLASS);
1011         }
1012
1013         if (hid) {
1014                 strcpy(device->pnp.hardware_id, hid);
1015                 device->flags.hardware_id = 1;
1016         }
1017         if (uid) {
1018                 strcpy(device->pnp.unique_id, uid);
1019                 device->flags.unique_id = 1;
1020         }
1021         if (cid_list) {
1022                 device->pnp.cid_list = kmalloc(cid_list->size, GFP_KERNEL);
1023                 if (device->pnp.cid_list)
1024                         memcpy(device->pnp.cid_list, cid_list, cid_list->size);
1025                 else
1026                         printk(KERN_ERR "Memory allocation error\n");
1027         }
1028
1029         kfree(buffer.pointer);
1030 }
1031
1032 static int acpi_device_set_context(struct acpi_device *device, int type)
1033 {
1034         acpi_status status = AE_OK;
1035         int result = 0;
1036         /*
1037          * Context
1038          * -------
1039          * Attach this 'struct acpi_device' to the ACPI object.  This makes
1040          * resolutions from handle->device very efficient.  Note that we need
1041          * to be careful with fixed-feature devices as they all attach to the
1042          * root object.
1043          */
1044         if (type != ACPI_BUS_TYPE_POWER_BUTTON &&
1045             type != ACPI_BUS_TYPE_SLEEP_BUTTON) {
1046                 status = acpi_attach_data(device->handle,
1047                                           acpi_bus_data_handler, device);
1048
1049                 if (ACPI_FAILURE(status)) {
1050                         printk("Error attaching device data\n");
1051                         result = -ENODEV;
1052                 }
1053         }
1054         return result;
1055 }
1056
1057 static int acpi_bus_remove(struct acpi_device *dev, int rmdevice)
1058 {
1059         if (!dev)
1060                 return -EINVAL;
1061
1062         dev->removal_type = ACPI_BUS_REMOVAL_EJECT;
1063         device_release_driver(&dev->dev);
1064
1065         if (!rmdevice)
1066                 return 0;
1067
1068         /*
1069          * unbind _ADR-Based Devices when hot removal
1070          */
1071         if (dev->flags.bus_address) {
1072                 if ((dev->parent) && (dev->parent->ops.unbind))
1073                         dev->parent->ops.unbind(dev);
1074         }
1075         acpi_device_unregister(dev, ACPI_BUS_REMOVAL_EJECT);
1076
1077         return 0;
1078 }
1079
1080 static int
1081 acpi_add_single_object(struct acpi_device **child,
1082                        struct acpi_device *parent, acpi_handle handle, int type,
1083                         struct acpi_bus_ops *ops)
1084 {
1085         int result = 0;
1086         struct acpi_device *device = NULL;
1087
1088
1089         if (!child)
1090                 return -EINVAL;
1091
1092         device = kzalloc(sizeof(struct acpi_device), GFP_KERNEL);
1093         if (!device) {
1094                 printk(KERN_ERR PREFIX "Memory allocation error\n");
1095                 return -ENOMEM;
1096         }
1097
1098         device->handle = handle;
1099         device->parent = parent;
1100         device->bus_ops = *ops; /* workround for not call .start */
1101
1102
1103         acpi_device_get_busid(device, handle, type);
1104
1105         /*
1106          * Flags
1107          * -----
1108          * Get prior to calling acpi_bus_get_status() so we know whether
1109          * or not _STA is present.  Note that we only look for object
1110          * handles -- cannot evaluate objects until we know the device is
1111          * present and properly initialized.
1112          */
1113         result = acpi_bus_get_flags(device);
1114         if (result)
1115                 goto end;
1116
1117         /*
1118          * Status
1119          * ------
1120          * See if the device is present.  We always assume that non-Device
1121          * and non-Processor objects (e.g. thermal zones, power resources,
1122          * etc.) are present, functioning, etc. (at least when parent object
1123          * is present).  Note that _STA has a different meaning for some
1124          * objects (e.g. power resources) so we need to be careful how we use
1125          * it.
1126          */
1127         switch (type) {
1128         case ACPI_BUS_TYPE_PROCESSOR:
1129         case ACPI_BUS_TYPE_DEVICE:
1130                 result = acpi_bus_get_status(device);
1131                 if (ACPI_FAILURE(result) || !device->status.present) {
1132                         result = -ENOENT;
1133                         goto end;
1134                 }
1135                 break;
1136         default:
1137                 STRUCT_TO_INT(device->status) =
1138                     ACPI_STA_DEVICE_PRESENT | ACPI_STA_DEVICE_ENABLED |
1139                     ACPI_STA_DEVICE_UI      | ACPI_STA_DEVICE_FUNCTIONING;
1140                 break;
1141         }
1142
1143         /*
1144          * Initialize Device
1145          * -----------------
1146          * TBD: Synch with Core's enumeration/initialization process.
1147          */
1148
1149         /*
1150          * Hardware ID, Unique ID, & Bus Address
1151          * -------------------------------------
1152          */
1153         acpi_device_set_id(device, parent, handle, type);
1154
1155         /*
1156          * Power Management
1157          * ----------------
1158          */
1159         if (device->flags.power_manageable) {
1160                 result = acpi_bus_get_power_flags(device);
1161                 if (result)
1162                         goto end;
1163         }
1164
1165         /*
1166          * Wakeup device management
1167          *-----------------------
1168          */
1169         if (device->flags.wake_capable) {
1170                 result = acpi_bus_get_wakeup_device_flags(device);
1171                 if (result)
1172                         goto end;
1173         }
1174
1175         /*
1176          * Performance Management
1177          * ----------------------
1178          */
1179         if (device->flags.performance_manageable) {
1180                 result = acpi_bus_get_perf_flags(device);
1181                 if (result)
1182                         goto end;
1183         }
1184
1185         if ((result = acpi_device_set_context(device, type)))
1186                 goto end;
1187
1188         result = acpi_device_register(device, parent);
1189
1190         /*
1191          * Bind _ADR-Based Devices when hot add
1192          */
1193         if (device->flags.bus_address) {
1194                 if (device->parent && device->parent->ops.bind)
1195                         device->parent->ops.bind(device);
1196         }
1197
1198       end:
1199         if (!result)
1200                 *child = device;
1201         else {
1202                 kfree(device->pnp.cid_list);
1203                 kfree(device);
1204         }
1205
1206         return result;
1207 }
1208
1209 static int acpi_bus_scan(struct acpi_device *start, struct acpi_bus_ops *ops)
1210 {
1211         acpi_status status = AE_OK;
1212         struct acpi_device *parent = NULL;
1213         struct acpi_device *child = NULL;
1214         acpi_handle phandle = NULL;
1215         acpi_handle chandle = NULL;
1216         acpi_object_type type = 0;
1217         u32 level = 1;
1218
1219
1220         if (!start)
1221                 return -EINVAL;
1222
1223         parent = start;
1224         phandle = start->handle;
1225
1226         /*
1227          * Parse through the ACPI namespace, identify all 'devices', and
1228          * create a new 'struct acpi_device' for each.
1229          */
1230         while ((level > 0) && parent) {
1231
1232                 status = acpi_get_next_object(ACPI_TYPE_ANY, phandle,
1233                                               chandle, &chandle);
1234
1235                 /*
1236                  * If this scope is exhausted then move our way back up.
1237                  */
1238                 if (ACPI_FAILURE(status)) {
1239                         level--;
1240                         chandle = phandle;
1241                         acpi_get_parent(phandle, &phandle);
1242                         if (parent->parent)
1243                                 parent = parent->parent;
1244                         continue;
1245                 }
1246
1247                 status = acpi_get_type(chandle, &type);
1248                 if (ACPI_FAILURE(status))
1249                         continue;
1250
1251                 /*
1252                  * If this is a scope object then parse it (depth-first).
1253                  */
1254                 if (type == ACPI_TYPE_LOCAL_SCOPE) {
1255                         level++;
1256                         phandle = chandle;
1257                         chandle = NULL;
1258                         continue;
1259                 }
1260
1261                 /*
1262                  * We're only interested in objects that we consider 'devices'.
1263                  */
1264                 switch (type) {
1265                 case ACPI_TYPE_DEVICE:
1266                         type = ACPI_BUS_TYPE_DEVICE;
1267                         break;
1268                 case ACPI_TYPE_PROCESSOR:
1269                         type = ACPI_BUS_TYPE_PROCESSOR;
1270                         break;
1271                 case ACPI_TYPE_THERMAL:
1272                         type = ACPI_BUS_TYPE_THERMAL;
1273                         break;
1274                 case ACPI_TYPE_POWER:
1275                         type = ACPI_BUS_TYPE_POWER;
1276                         break;
1277                 default:
1278                         continue;
1279                 }
1280
1281                 if (ops->acpi_op_add)
1282                         status = acpi_add_single_object(&child, parent,
1283                                 chandle, type, ops);
1284                 else
1285                         status = acpi_bus_get_device(chandle, &child);
1286
1287                 if (ACPI_FAILURE(status))
1288                         continue;
1289
1290                 if (ops->acpi_op_start && !(ops->acpi_op_add)) {
1291                         status = acpi_start_single_object(child);
1292                         if (ACPI_FAILURE(status))
1293                                 continue;
1294                 }
1295
1296                 /*
1297                  * If the device is present, enabled, and functioning then
1298                  * parse its scope (depth-first).  Note that we need to
1299                  * represent absent devices to facilitate PnP notifications
1300                  * -- but only the subtree head (not all of its children,
1301                  * which will be enumerated when the parent is inserted).
1302                  *
1303                  * TBD: Need notifications and other detection mechanisms
1304                  *      in place before we can fully implement this.
1305                  */
1306                 if (child->status.present) {
1307                         status = acpi_get_next_object(ACPI_TYPE_ANY, chandle,
1308                                                       NULL, NULL);
1309                         if (ACPI_SUCCESS(status)) {
1310                                 level++;
1311                                 phandle = chandle;
1312                                 chandle = NULL;
1313                                 parent = child;
1314                         }
1315                 }
1316         }
1317
1318         return 0;
1319 }
1320
1321 int
1322 acpi_bus_add(struct acpi_device **child,
1323              struct acpi_device *parent, acpi_handle handle, int type)
1324 {
1325         int result;
1326         struct acpi_bus_ops ops;
1327
1328         memset(&ops, 0, sizeof(ops));
1329         ops.acpi_op_add = 1;
1330
1331         result = acpi_add_single_object(child, parent, handle, type, &ops);
1332         if (!result)
1333                 result = acpi_bus_scan(*child, &ops);
1334
1335         return result;
1336 }
1337
1338 EXPORT_SYMBOL(acpi_bus_add);
1339
1340 int acpi_bus_start(struct acpi_device *device)
1341 {
1342         int result;
1343         struct acpi_bus_ops ops;
1344
1345
1346         if (!device)
1347                 return -EINVAL;
1348
1349         result = acpi_start_single_object(device);
1350         if (!result) {
1351                 memset(&ops, 0, sizeof(ops));
1352                 ops.acpi_op_start = 1;
1353                 result = acpi_bus_scan(device, &ops);
1354         }
1355         return result;
1356 }
1357
1358 EXPORT_SYMBOL(acpi_bus_start);
1359
1360 int acpi_bus_trim(struct acpi_device *start, int rmdevice)
1361 {
1362         acpi_status status;
1363         struct acpi_device *parent, *child;
1364         acpi_handle phandle, chandle;
1365         acpi_object_type type;
1366         u32 level = 1;
1367         int err = 0;
1368
1369         parent = start;
1370         phandle = start->handle;
1371         child = chandle = NULL;
1372
1373         while ((level > 0) && parent && (!err)) {
1374                 status = acpi_get_next_object(ACPI_TYPE_ANY, phandle,
1375                                               chandle, &chandle);
1376
1377                 /*
1378                  * If this scope is exhausted then move our way back up.
1379                  */
1380                 if (ACPI_FAILURE(status)) {
1381                         level--;
1382                         chandle = phandle;
1383                         acpi_get_parent(phandle, &phandle);
1384                         child = parent;
1385                         parent = parent->parent;
1386
1387                         if (level == 0)
1388                                 err = acpi_bus_remove(child, rmdevice);
1389                         else
1390                                 err = acpi_bus_remove(child, 1);
1391
1392                         continue;
1393                 }
1394
1395                 status = acpi_get_type(chandle, &type);
1396                 if (ACPI_FAILURE(status)) {
1397                         continue;
1398                 }
1399                 /*
1400                  * If there is a device corresponding to chandle then
1401                  * parse it (depth-first).
1402                  */
1403                 if (acpi_bus_get_device(chandle, &child) == 0) {
1404                         level++;
1405                         phandle = chandle;
1406                         chandle = NULL;
1407                         parent = child;
1408                 }
1409                 continue;
1410         }
1411         return err;
1412 }
1413 EXPORT_SYMBOL_GPL(acpi_bus_trim);
1414
1415
1416 static int acpi_bus_scan_fixed(struct acpi_device *root)
1417 {
1418         int result = 0;
1419         struct acpi_device *device = NULL;
1420         struct acpi_bus_ops ops;
1421
1422         if (!root)
1423                 return -ENODEV;
1424
1425         memset(&ops, 0, sizeof(ops));
1426         ops.acpi_op_add = 1;
1427         ops.acpi_op_start = 1;
1428
1429         /*
1430          * Enumerate all fixed-feature devices.
1431          */
1432         if ((acpi_gbl_FADT.flags & ACPI_FADT_POWER_BUTTON) == 0) {
1433                 result = acpi_add_single_object(&device, acpi_root,
1434                                                 NULL,
1435                                                 ACPI_BUS_TYPE_POWER_BUTTON,
1436                                                 &ops);
1437         }
1438
1439         if ((acpi_gbl_FADT.flags & ACPI_FADT_SLEEP_BUTTON) == 0) {
1440                 result = acpi_add_single_object(&device, acpi_root,
1441                                                 NULL,
1442                                                 ACPI_BUS_TYPE_SLEEP_BUTTON,
1443                                                 &ops);
1444         }
1445
1446         return result;
1447 }
1448
1449 static int __init acpi_scan_init(void)
1450 {
1451         int result;
1452         struct acpi_bus_ops ops;
1453
1454
1455         if (acpi_disabled)
1456                 return 0;
1457
1458         memset(&ops, 0, sizeof(ops));
1459         ops.acpi_op_add = 1;
1460         ops.acpi_op_start = 1;
1461
1462         result = bus_register(&acpi_bus_type);
1463         if (result) {
1464                 /* We don't want to quit even if we failed to add suspend/resume */
1465                 printk(KERN_ERR PREFIX "Could not register bus type\n");
1466         }
1467
1468         /*
1469          * Create the root device in the bus's device tree
1470          */
1471         result = acpi_add_single_object(&acpi_root, NULL, ACPI_ROOT_OBJECT,
1472                                         ACPI_BUS_TYPE_SYSTEM, &ops);
1473         if (result)
1474                 goto Done;
1475
1476         /*
1477          * Enumerate devices in the ACPI namespace.
1478          */
1479         result = acpi_bus_scan_fixed(acpi_root);
1480         if (!result)
1481                 result = acpi_bus_scan(acpi_root, &ops);
1482
1483         if (result)
1484                 acpi_device_unregister(acpi_root, ACPI_BUS_REMOVAL_NORMAL);
1485
1486       Done:
1487         return result;
1488 }
1489
1490 subsys_initcall(acpi_scan_init);