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