ACPICA: Major update for acpi_get_object_info external interface
[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 #include <linux/signal.h>
10 #include <linux/kthread.h>
11
12 #include <acpi/acpi_drivers.h>
13
14 #include "internal.h"
15
16 #define _COMPONENT              ACPI_BUS_COMPONENT
17 ACPI_MODULE_NAME("scan");
18 #define STRUCT_TO_INT(s)        (*((int*)&s))
19 extern struct acpi_device *acpi_root;
20
21 #define ACPI_BUS_CLASS                  "system_bus"
22 #define ACPI_BUS_HID                    "LNXSYBUS"
23 #define ACPI_BUS_DEVICE_NAME            "System Bus"
24
25 static LIST_HEAD(acpi_device_list);
26 static LIST_HEAD(acpi_bus_id_list);
27 DEFINE_MUTEX(acpi_device_lock);
28 LIST_HEAD(acpi_wakeup_device_list);
29
30 struct acpi_device_bus_id{
31         char bus_id[15];
32         unsigned int instance_no;
33         struct list_head node;
34 };
35
36 /*
37  * Creates hid/cid(s) string needed for modalias and uevent
38  * e.g. on a device with hid:IBM0001 and cid:ACPI0001 you get:
39  * char *modalias: "acpi:IBM0001:ACPI0001"
40 */
41 static int create_modalias(struct acpi_device *acpi_dev, char *modalias,
42                            int size)
43 {
44         int len;
45         int count;
46
47         if (!acpi_dev->flags.hardware_id && !acpi_dev->flags.compatible_ids)
48                 return -ENODEV;
49
50         len = snprintf(modalias, size, "acpi:");
51         size -= len;
52
53         if (acpi_dev->flags.hardware_id) {
54                 count = snprintf(&modalias[len], size, "%s:",
55                                  acpi_dev->pnp.hardware_id);
56                 if (count < 0 || count >= size)
57                         return -EINVAL;
58                 len += count;
59                 size -= count;
60         }
61
62         if (acpi_dev->flags.compatible_ids) {
63                 struct acpica_device_id_list *cid_list;
64                 int i;
65
66                 cid_list = acpi_dev->pnp.cid_list;
67                 for (i = 0; i < cid_list->count; i++) {
68                         count = snprintf(&modalias[len], size, "%s:",
69                                          cid_list->ids[i].string);
70                         if (count < 0 || count >= size) {
71                                 printk(KERN_ERR PREFIX "%s cid[%i] exceeds event buffer size",
72                                        acpi_dev->pnp.device_name, i);
73                                 break;
74                         }
75                         len += count;
76                         size -= count;
77                 }
78         }
79
80         modalias[len] = '\0';
81         return len;
82 }
83
84 static ssize_t
85 acpi_device_modalias_show(struct device *dev, struct device_attribute *attr, char *buf) {
86         struct acpi_device *acpi_dev = to_acpi_device(dev);
87         int len;
88
89         /* Device has no HID and no CID or string is >1024 */
90         len = create_modalias(acpi_dev, buf, 1024);
91         if (len <= 0)
92                 return 0;
93         buf[len++] = '\n';
94         return len;
95 }
96 static DEVICE_ATTR(modalias, 0444, acpi_device_modalias_show, NULL);
97
98 static void acpi_bus_hot_remove_device(void *context)
99 {
100         struct acpi_device *device;
101         acpi_handle handle = context;
102         struct acpi_object_list arg_list;
103         union acpi_object arg;
104         acpi_status status = AE_OK;
105
106         if (acpi_bus_get_device(handle, &device))
107                 return;
108
109         if (!device)
110                 return;
111
112         ACPI_DEBUG_PRINT((ACPI_DB_INFO,
113                 "Hot-removing device %s...\n", dev_name(&device->dev)));
114
115         if (acpi_bus_trim(device, 1)) {
116                 printk(KERN_ERR PREFIX
117                                 "Removing device failed\n");
118                 return;
119         }
120
121         /* power off device */
122         status = acpi_evaluate_object(handle, "_PS3", NULL, NULL);
123         if (ACPI_FAILURE(status) && status != AE_NOT_FOUND)
124                 printk(KERN_WARNING PREFIX
125                                 "Power-off device failed\n");
126
127         if (device->flags.lockable) {
128                 arg_list.count = 1;
129                 arg_list.pointer = &arg;
130                 arg.type = ACPI_TYPE_INTEGER;
131                 arg.integer.value = 0;
132                 acpi_evaluate_object(handle, "_LCK", &arg_list, NULL);
133         }
134
135         arg_list.count = 1;
136         arg_list.pointer = &arg;
137         arg.type = ACPI_TYPE_INTEGER;
138         arg.integer.value = 1;
139
140         /*
141          * TBD: _EJD support.
142          */
143         status = acpi_evaluate_object(handle, "_EJ0", &arg_list, NULL);
144         if (ACPI_FAILURE(status))
145                 printk(KERN_WARNING PREFIX
146                                 "Eject device failed\n");
147
148         return;
149 }
150
151 static ssize_t
152 acpi_eject_store(struct device *d, struct device_attribute *attr,
153                 const char *buf, size_t count)
154 {
155         int ret = count;
156         acpi_status status;
157         acpi_object_type type = 0;
158         struct acpi_device *acpi_device = to_acpi_device(d);
159
160         if ((!count) || (buf[0] != '1')) {
161                 return -EINVAL;
162         }
163 #ifndef FORCE_EJECT
164         if (acpi_device->driver == NULL) {
165                 ret = -ENODEV;
166                 goto err;
167         }
168 #endif
169         status = acpi_get_type(acpi_device->handle, &type);
170         if (ACPI_FAILURE(status) || (!acpi_device->flags.ejectable)) {
171                 ret = -ENODEV;
172                 goto err;
173         }
174
175         acpi_os_hotplug_execute(acpi_bus_hot_remove_device, acpi_device->handle);
176 err:
177         return ret;
178 }
179
180 static DEVICE_ATTR(eject, 0200, NULL, acpi_eject_store);
181
182 static ssize_t
183 acpi_device_hid_show(struct device *dev, struct device_attribute *attr, char *buf) {
184         struct acpi_device *acpi_dev = to_acpi_device(dev);
185
186         return sprintf(buf, "%s\n", acpi_dev->pnp.hardware_id);
187 }
188 static DEVICE_ATTR(hid, 0444, acpi_device_hid_show, NULL);
189
190 static ssize_t
191 acpi_device_path_show(struct device *dev, struct device_attribute *attr, char *buf) {
192         struct acpi_device *acpi_dev = to_acpi_device(dev);
193         struct acpi_buffer path = {ACPI_ALLOCATE_BUFFER, NULL};
194         int result;
195
196         result = acpi_get_name(acpi_dev->handle, ACPI_FULL_PATHNAME, &path);
197         if (result)
198                 goto end;
199
200         result = sprintf(buf, "%s\n", (char*)path.pointer);
201         kfree(path.pointer);
202 end:
203         return result;
204 }
205 static DEVICE_ATTR(path, 0444, acpi_device_path_show, NULL);
206
207 static int acpi_device_setup_files(struct acpi_device *dev)
208 {
209         acpi_status status;
210         acpi_handle temp;
211         int result = 0;
212
213         /*
214          * Devices gotten from FADT don't have a "path" attribute
215          */
216         if (dev->handle) {
217                 result = device_create_file(&dev->dev, &dev_attr_path);
218                 if (result)
219                         goto end;
220         }
221
222         if (dev->flags.hardware_id) {
223                 result = device_create_file(&dev->dev, &dev_attr_hid);
224                 if (result)
225                         goto end;
226         }
227
228         if (dev->flags.hardware_id || dev->flags.compatible_ids) {
229                 result = device_create_file(&dev->dev, &dev_attr_modalias);
230                 if (result)
231                         goto end;
232         }
233
234         /*
235          * If device has _EJ0, 'eject' file is created that is used to trigger
236          * hot-removal function from userland.
237          */
238         status = acpi_get_handle(dev->handle, "_EJ0", &temp);
239         if (ACPI_SUCCESS(status))
240                 result = device_create_file(&dev->dev, &dev_attr_eject);
241 end:
242         return result;
243 }
244
245 static void acpi_device_remove_files(struct acpi_device *dev)
246 {
247         acpi_status status;
248         acpi_handle temp;
249
250         /*
251          * If device has _EJ0, 'eject' file is created that is used to trigger
252          * hot-removal function from userland.
253          */
254         status = acpi_get_handle(dev->handle, "_EJ0", &temp);
255         if (ACPI_SUCCESS(status))
256                 device_remove_file(&dev->dev, &dev_attr_eject);
257
258         if (dev->flags.hardware_id || dev->flags.compatible_ids)
259                 device_remove_file(&dev->dev, &dev_attr_modalias);
260
261         if (dev->flags.hardware_id)
262                 device_remove_file(&dev->dev, &dev_attr_hid);
263         if (dev->handle)
264                 device_remove_file(&dev->dev, &dev_attr_path);
265 }
266 /* --------------------------------------------------------------------------
267                         ACPI Bus operations
268    -------------------------------------------------------------------------- */
269
270 int acpi_match_device_ids(struct acpi_device *device,
271                           const struct acpi_device_id *ids)
272 {
273         const struct acpi_device_id *id;
274
275         /*
276          * If the device is not present, it is unnecessary to load device
277          * driver for it.
278          */
279         if (!device->status.present)
280                 return -ENODEV;
281
282         if (device->flags.hardware_id) {
283                 for (id = ids; id->id[0]; id++) {
284                         if (!strcmp((char*)id->id, device->pnp.hardware_id))
285                                 return 0;
286                 }
287         }
288
289         if (device->flags.compatible_ids) {
290                 struct acpica_device_id_list *cid_list = device->pnp.cid_list;
291                 int i;
292
293                 for (id = ids; id->id[0]; id++) {
294                         /* compare multiple _CID entries against driver ids */
295                         for (i = 0; i < cid_list->count; i++) {
296                                 if (!strcmp((char*)id->id,
297                                             cid_list->ids[i].string))
298                                         return 0;
299                         }
300                 }
301         }
302
303         return -ENOENT;
304 }
305 EXPORT_SYMBOL(acpi_match_device_ids);
306
307 static void acpi_device_release(struct device *dev)
308 {
309         struct acpi_device *acpi_dev = to_acpi_device(dev);
310
311         kfree(acpi_dev->pnp.cid_list);
312         kfree(acpi_dev);
313 }
314
315 static int acpi_device_suspend(struct device *dev, pm_message_t state)
316 {
317         struct acpi_device *acpi_dev = to_acpi_device(dev);
318         struct acpi_driver *acpi_drv = acpi_dev->driver;
319
320         if (acpi_drv && acpi_drv->ops.suspend)
321                 return acpi_drv->ops.suspend(acpi_dev, state);
322         return 0;
323 }
324
325 static int acpi_device_resume(struct device *dev)
326 {
327         struct acpi_device *acpi_dev = to_acpi_device(dev);
328         struct acpi_driver *acpi_drv = acpi_dev->driver;
329
330         if (acpi_drv && acpi_drv->ops.resume)
331                 return acpi_drv->ops.resume(acpi_dev);
332         return 0;
333 }
334
335 static int acpi_bus_match(struct device *dev, struct device_driver *drv)
336 {
337         struct acpi_device *acpi_dev = to_acpi_device(dev);
338         struct acpi_driver *acpi_drv = to_acpi_driver(drv);
339
340         return !acpi_match_device_ids(acpi_dev, acpi_drv->ids);
341 }
342
343 static int acpi_device_uevent(struct device *dev, struct kobj_uevent_env *env)
344 {
345         struct acpi_device *acpi_dev = to_acpi_device(dev);
346         int len;
347
348         if (add_uevent_var(env, "MODALIAS="))
349                 return -ENOMEM;
350         len = create_modalias(acpi_dev, &env->buf[env->buflen - 1],
351                               sizeof(env->buf) - env->buflen);
352         if (len >= (sizeof(env->buf) - env->buflen))
353                 return -ENOMEM;
354         env->buflen += len;
355         return 0;
356 }
357
358 static void acpi_device_notify(acpi_handle handle, u32 event, void *data)
359 {
360         struct acpi_device *device = data;
361
362         device->driver->ops.notify(device, event);
363 }
364
365 static acpi_status acpi_device_notify_fixed(void *data)
366 {
367         struct acpi_device *device = data;
368
369         acpi_device_notify(device->handle, ACPI_FIXED_HARDWARE_EVENT, device);
370         return AE_OK;
371 }
372
373 static int acpi_device_install_notify_handler(struct acpi_device *device)
374 {
375         acpi_status status;
376         char *hid;
377
378         hid = acpi_device_hid(device);
379         if (!strcmp(hid, ACPI_BUTTON_HID_POWERF))
380                 status =
381                     acpi_install_fixed_event_handler(ACPI_EVENT_POWER_BUTTON,
382                                                      acpi_device_notify_fixed,
383                                                      device);
384         else if (!strcmp(hid, ACPI_BUTTON_HID_SLEEPF))
385                 status =
386                     acpi_install_fixed_event_handler(ACPI_EVENT_SLEEP_BUTTON,
387                                                      acpi_device_notify_fixed,
388                                                      device);
389         else
390                 status = acpi_install_notify_handler(device->handle,
391                                                      ACPI_DEVICE_NOTIFY,
392                                                      acpi_device_notify,
393                                                      device);
394
395         if (ACPI_FAILURE(status))
396                 return -EINVAL;
397         return 0;
398 }
399
400 static void acpi_device_remove_notify_handler(struct acpi_device *device)
401 {
402         if (!strcmp(acpi_device_hid(device), ACPI_BUTTON_HID_POWERF))
403                 acpi_remove_fixed_event_handler(ACPI_EVENT_POWER_BUTTON,
404                                                 acpi_device_notify_fixed);
405         else if (!strcmp(acpi_device_hid(device), ACPI_BUTTON_HID_SLEEPF))
406                 acpi_remove_fixed_event_handler(ACPI_EVENT_SLEEP_BUTTON,
407                                                 acpi_device_notify_fixed);
408         else
409                 acpi_remove_notify_handler(device->handle, ACPI_DEVICE_NOTIFY,
410                                            acpi_device_notify);
411 }
412
413 static int acpi_bus_driver_init(struct acpi_device *, struct acpi_driver *);
414 static int acpi_start_single_object(struct acpi_device *);
415 static int acpi_device_probe(struct device * dev)
416 {
417         struct acpi_device *acpi_dev = to_acpi_device(dev);
418         struct acpi_driver *acpi_drv = to_acpi_driver(dev->driver);
419         int ret;
420
421         ret = acpi_bus_driver_init(acpi_dev, acpi_drv);
422         if (!ret) {
423                 if (acpi_dev->bus_ops.acpi_op_start)
424                         acpi_start_single_object(acpi_dev);
425
426                 if (acpi_drv->ops.notify) {
427                         ret = acpi_device_install_notify_handler(acpi_dev);
428                         if (ret) {
429                                 if (acpi_drv->ops.stop)
430                                         acpi_drv->ops.stop(acpi_dev,
431                                                    acpi_dev->removal_type);
432                                 if (acpi_drv->ops.remove)
433                                         acpi_drv->ops.remove(acpi_dev,
434                                                      acpi_dev->removal_type);
435                                 return ret;
436                         }
437                 }
438
439                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
440                         "Found driver [%s] for device [%s]\n",
441                         acpi_drv->name, acpi_dev->pnp.bus_id));
442                 get_device(dev);
443         }
444         return ret;
445 }
446
447 static int acpi_device_remove(struct device * dev)
448 {
449         struct acpi_device *acpi_dev = to_acpi_device(dev);
450         struct acpi_driver *acpi_drv = acpi_dev->driver;
451
452         if (acpi_drv) {
453                 if (acpi_drv->ops.notify)
454                         acpi_device_remove_notify_handler(acpi_dev);
455                 if (acpi_drv->ops.stop)
456                         acpi_drv->ops.stop(acpi_dev, acpi_dev->removal_type);
457                 if (acpi_drv->ops.remove)
458                         acpi_drv->ops.remove(acpi_dev, acpi_dev->removal_type);
459         }
460         acpi_dev->driver = NULL;
461         acpi_dev->driver_data = NULL;
462
463         put_device(dev);
464         return 0;
465 }
466
467 struct bus_type acpi_bus_type = {
468         .name           = "acpi",
469         .suspend        = acpi_device_suspend,
470         .resume         = acpi_device_resume,
471         .match          = acpi_bus_match,
472         .probe          = acpi_device_probe,
473         .remove         = acpi_device_remove,
474         .uevent         = acpi_device_uevent,
475 };
476
477 static int acpi_device_register(struct acpi_device *device,
478                                  struct acpi_device *parent)
479 {
480         int result;
481         struct acpi_device_bus_id *acpi_device_bus_id, *new_bus_id;
482         int found = 0;
483         /*
484          * Linkage
485          * -------
486          * Link this device to its parent and siblings.
487          */
488         INIT_LIST_HEAD(&device->children);
489         INIT_LIST_HEAD(&device->node);
490         INIT_LIST_HEAD(&device->wakeup_list);
491
492         new_bus_id = kzalloc(sizeof(struct acpi_device_bus_id), GFP_KERNEL);
493         if (!new_bus_id) {
494                 printk(KERN_ERR PREFIX "Memory allocation error\n");
495                 return -ENOMEM;
496         }
497
498         mutex_lock(&acpi_device_lock);
499         /*
500          * Find suitable bus_id and instance number in acpi_bus_id_list
501          * If failed, create one and link it into acpi_bus_id_list
502          */
503         list_for_each_entry(acpi_device_bus_id, &acpi_bus_id_list, node) {
504                 if(!strcmp(acpi_device_bus_id->bus_id, device->flags.hardware_id? device->pnp.hardware_id : "device")) {
505                         acpi_device_bus_id->instance_no ++;
506                         found = 1;
507                         kfree(new_bus_id);
508                         break;
509                 }
510         }
511         if (!found) {
512                 acpi_device_bus_id = new_bus_id;
513                 strcpy(acpi_device_bus_id->bus_id, device->flags.hardware_id ? device->pnp.hardware_id : "device");
514                 acpi_device_bus_id->instance_no = 0;
515                 list_add_tail(&acpi_device_bus_id->node, &acpi_bus_id_list);
516         }
517         dev_set_name(&device->dev, "%s:%02x", acpi_device_bus_id->bus_id, acpi_device_bus_id->instance_no);
518
519         if (device->parent)
520                 list_add_tail(&device->node, &device->parent->children);
521
522         if (device->wakeup.flags.valid)
523                 list_add_tail(&device->wakeup_list, &acpi_wakeup_device_list);
524         mutex_unlock(&acpi_device_lock);
525
526         if (device->parent)
527                 device->dev.parent = &parent->dev;
528         device->dev.bus = &acpi_bus_type;
529         device->dev.release = &acpi_device_release;
530         result = device_register(&device->dev);
531         if (result) {
532                 dev_err(&device->dev, "Error registering device\n");
533                 goto end;
534         }
535
536         result = acpi_device_setup_files(device);
537         if (result)
538                 printk(KERN_ERR PREFIX "Error creating sysfs interface for device %s\n",
539                        dev_name(&device->dev));
540
541         device->removal_type = ACPI_BUS_REMOVAL_NORMAL;
542         return 0;
543 end:
544         mutex_lock(&acpi_device_lock);
545         if (device->parent)
546                 list_del(&device->node);
547         list_del(&device->wakeup_list);
548         mutex_unlock(&acpi_device_lock);
549         return result;
550 }
551
552 static void acpi_device_unregister(struct acpi_device *device, int type)
553 {
554         mutex_lock(&acpi_device_lock);
555         if (device->parent)
556                 list_del(&device->node);
557
558         list_del(&device->wakeup_list);
559         mutex_unlock(&acpi_device_lock);
560
561         acpi_detach_data(device->handle, acpi_bus_data_handler);
562
563         acpi_device_remove_files(device);
564         device_unregister(&device->dev);
565 }
566
567 /* --------------------------------------------------------------------------
568                                  Driver Management
569    -------------------------------------------------------------------------- */
570 /**
571  * acpi_bus_driver_init - add a device to a driver
572  * @device: the device to add and initialize
573  * @driver: driver for the device
574  *
575  * Used to initialize a device via its device driver.  Called whenever a
576  * driver is bound to a device.  Invokes the driver's add() ops.
577  */
578 static int
579 acpi_bus_driver_init(struct acpi_device *device, struct acpi_driver *driver)
580 {
581         int result = 0;
582
583         if (!device || !driver)
584                 return -EINVAL;
585
586         if (!driver->ops.add)
587                 return -ENOSYS;
588
589         result = driver->ops.add(device);
590         if (result) {
591                 device->driver = NULL;
592                 device->driver_data = NULL;
593                 return result;
594         }
595
596         device->driver = driver;
597
598         /*
599          * TBD - Configuration Management: Assign resources to device based
600          * upon possible configuration and currently allocated resources.
601          */
602
603         ACPI_DEBUG_PRINT((ACPI_DB_INFO,
604                           "Driver successfully bound to device\n"));
605         return 0;
606 }
607
608 static int acpi_start_single_object(struct acpi_device *device)
609 {
610         int result = 0;
611         struct acpi_driver *driver;
612
613
614         if (!(driver = device->driver))
615                 return 0;
616
617         if (driver->ops.start) {
618                 result = driver->ops.start(device);
619                 if (result && driver->ops.remove)
620                         driver->ops.remove(device, ACPI_BUS_REMOVAL_NORMAL);
621         }
622
623         return result;
624 }
625
626 /**
627  * acpi_bus_register_driver - register a driver with the ACPI bus
628  * @driver: driver being registered
629  *
630  * Registers a driver with the ACPI bus.  Searches the namespace for all
631  * devices that match the driver's criteria and binds.  Returns zero for
632  * success or a negative error status for failure.
633  */
634 int acpi_bus_register_driver(struct acpi_driver *driver)
635 {
636         int ret;
637
638         if (acpi_disabled)
639                 return -ENODEV;
640         driver->drv.name = driver->name;
641         driver->drv.bus = &acpi_bus_type;
642         driver->drv.owner = driver->owner;
643
644         ret = driver_register(&driver->drv);
645         return ret;
646 }
647
648 EXPORT_SYMBOL(acpi_bus_register_driver);
649
650 /**
651  * acpi_bus_unregister_driver - unregisters a driver with the APIC bus
652  * @driver: driver to unregister
653  *
654  * Unregisters a driver with the ACPI bus.  Searches the namespace for all
655  * devices that match the driver's criteria and unbinds.
656  */
657 void acpi_bus_unregister_driver(struct acpi_driver *driver)
658 {
659         driver_unregister(&driver->drv);
660 }
661
662 EXPORT_SYMBOL(acpi_bus_unregister_driver);
663
664 /* --------------------------------------------------------------------------
665                                  Device Enumeration
666    -------------------------------------------------------------------------- */
667 acpi_status
668 acpi_bus_get_ejd(acpi_handle handle, acpi_handle *ejd)
669 {
670         acpi_status status;
671         acpi_handle tmp;
672         struct acpi_buffer buffer = {ACPI_ALLOCATE_BUFFER, NULL};
673         union acpi_object *obj;
674
675         status = acpi_get_handle(handle, "_EJD", &tmp);
676         if (ACPI_FAILURE(status))
677                 return status;
678
679         status = acpi_evaluate_object(handle, "_EJD", NULL, &buffer);
680         if (ACPI_SUCCESS(status)) {
681                 obj = buffer.pointer;
682                 status = acpi_get_handle(ACPI_ROOT_OBJECT, obj->string.pointer,
683                                          ejd);
684                 kfree(buffer.pointer);
685         }
686         return status;
687 }
688 EXPORT_SYMBOL_GPL(acpi_bus_get_ejd);
689
690 void acpi_bus_data_handler(acpi_handle handle, u32 function, void *context)
691 {
692
693         /* TBD */
694
695         return;
696 }
697
698 static int acpi_bus_get_perf_flags(struct acpi_device *device)
699 {
700         device->performance.state = ACPI_STATE_UNKNOWN;
701         return 0;
702 }
703
704 static acpi_status
705 acpi_bus_extract_wakeup_device_power_package(struct acpi_device *device,
706                                              union acpi_object *package)
707 {
708         int i = 0;
709         union acpi_object *element = NULL;
710
711         if (!device || !package || (package->package.count < 2))
712                 return AE_BAD_PARAMETER;
713
714         element = &(package->package.elements[0]);
715         if (!element)
716                 return AE_BAD_PARAMETER;
717         if (element->type == ACPI_TYPE_PACKAGE) {
718                 if ((element->package.count < 2) ||
719                     (element->package.elements[0].type !=
720                      ACPI_TYPE_LOCAL_REFERENCE)
721                     || (element->package.elements[1].type != ACPI_TYPE_INTEGER))
722                         return AE_BAD_DATA;
723                 device->wakeup.gpe_device =
724                     element->package.elements[0].reference.handle;
725                 device->wakeup.gpe_number =
726                     (u32) element->package.elements[1].integer.value;
727         } else if (element->type == ACPI_TYPE_INTEGER) {
728                 device->wakeup.gpe_number = element->integer.value;
729         } else
730                 return AE_BAD_DATA;
731
732         element = &(package->package.elements[1]);
733         if (element->type != ACPI_TYPE_INTEGER) {
734                 return AE_BAD_DATA;
735         }
736         device->wakeup.sleep_state = element->integer.value;
737
738         if ((package->package.count - 2) > ACPI_MAX_HANDLES) {
739                 return AE_NO_MEMORY;
740         }
741         device->wakeup.resources.count = package->package.count - 2;
742         for (i = 0; i < device->wakeup.resources.count; i++) {
743                 element = &(package->package.elements[i + 2]);
744                 if (element->type != ACPI_TYPE_LOCAL_REFERENCE)
745                         return AE_BAD_DATA;
746
747                 device->wakeup.resources.handles[i] = element->reference.handle;
748         }
749
750         return AE_OK;
751 }
752
753 static int acpi_bus_get_wakeup_device_flags(struct acpi_device *device)
754 {
755         acpi_status status = 0;
756         struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
757         union acpi_object *package = NULL;
758         int psw_error;
759
760         struct acpi_device_id button_device_ids[] = {
761                 {"PNP0C0D", 0},
762                 {"PNP0C0C", 0},
763                 {"PNP0C0E", 0},
764                 {"", 0},
765         };
766
767         /* _PRW */
768         status = acpi_evaluate_object(device->handle, "_PRW", NULL, &buffer);
769         if (ACPI_FAILURE(status)) {
770                 ACPI_EXCEPTION((AE_INFO, status, "Evaluating _PRW"));
771                 goto end;
772         }
773
774         package = (union acpi_object *)buffer.pointer;
775         status = acpi_bus_extract_wakeup_device_power_package(device, package);
776         if (ACPI_FAILURE(status)) {
777                 ACPI_EXCEPTION((AE_INFO, status, "Extracting _PRW package"));
778                 goto end;
779         }
780
781         kfree(buffer.pointer);
782
783         device->wakeup.flags.valid = 1;
784         /* Call _PSW/_DSW object to disable its ability to wake the sleeping
785          * system for the ACPI device with the _PRW object.
786          * The _PSW object is depreciated in ACPI 3.0 and is replaced by _DSW.
787          * So it is necessary to call _DSW object first. Only when it is not
788          * present will the _PSW object used.
789          */
790         psw_error = acpi_device_sleep_wake(device, 0, 0, 0);
791         if (psw_error)
792                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
793                                 "error in _DSW or _PSW evaluation\n"));
794
795         /* Power button, Lid switch always enable wakeup */
796         if (!acpi_match_device_ids(device, button_device_ids))
797                 device->wakeup.flags.run_wake = 1;
798
799 end:
800         if (ACPI_FAILURE(status))
801                 device->flags.wake_capable = 0;
802         return 0;
803 }
804
805 static int acpi_bus_get_power_flags(struct acpi_device *device)
806 {
807         acpi_status status = 0;
808         acpi_handle handle = NULL;
809         u32 i = 0;
810
811
812         /*
813          * Power Management Flags
814          */
815         status = acpi_get_handle(device->handle, "_PSC", &handle);
816         if (ACPI_SUCCESS(status))
817                 device->power.flags.explicit_get = 1;
818         status = acpi_get_handle(device->handle, "_IRC", &handle);
819         if (ACPI_SUCCESS(status))
820                 device->power.flags.inrush_current = 1;
821
822         /*
823          * Enumerate supported power management states
824          */
825         for (i = ACPI_STATE_D0; i <= ACPI_STATE_D3; i++) {
826                 struct acpi_device_power_state *ps = &device->power.states[i];
827                 char object_name[5] = { '_', 'P', 'R', '0' + i, '\0' };
828
829                 /* Evaluate "_PRx" to se if power resources are referenced */
830                 acpi_evaluate_reference(device->handle, object_name, NULL,
831                                         &ps->resources);
832                 if (ps->resources.count) {
833                         device->power.flags.power_resources = 1;
834                         ps->flags.valid = 1;
835                 }
836
837                 /* Evaluate "_PSx" to see if we can do explicit sets */
838                 object_name[2] = 'S';
839                 status = acpi_get_handle(device->handle, object_name, &handle);
840                 if (ACPI_SUCCESS(status)) {
841                         ps->flags.explicit_set = 1;
842                         ps->flags.valid = 1;
843                 }
844
845                 /* State is valid if we have some power control */
846                 if (ps->resources.count || ps->flags.explicit_set)
847                         ps->flags.valid = 1;
848
849                 ps->power = -1; /* Unknown - driver assigned */
850                 ps->latency = -1;       /* Unknown - driver assigned */
851         }
852
853         /* Set defaults for D0 and D3 states (always valid) */
854         device->power.states[ACPI_STATE_D0].flags.valid = 1;
855         device->power.states[ACPI_STATE_D0].power = 100;
856         device->power.states[ACPI_STATE_D3].flags.valid = 1;
857         device->power.states[ACPI_STATE_D3].power = 0;
858
859         /* TBD: System wake support and resource requirements. */
860
861         device->power.state = ACPI_STATE_UNKNOWN;
862         acpi_bus_get_power(device->handle, &(device->power.state));
863
864         return 0;
865 }
866
867 static int acpi_bus_get_flags(struct acpi_device *device)
868 {
869         acpi_status status = AE_OK;
870         acpi_handle temp = NULL;
871
872
873         /* Presence of _STA indicates 'dynamic_status' */
874         status = acpi_get_handle(device->handle, "_STA", &temp);
875         if (ACPI_SUCCESS(status))
876                 device->flags.dynamic_status = 1;
877
878         /* Presence of _CID indicates 'compatible_ids' */
879         status = acpi_get_handle(device->handle, "_CID", &temp);
880         if (ACPI_SUCCESS(status))
881                 device->flags.compatible_ids = 1;
882
883         /* Presence of _RMV indicates 'removable' */
884         status = acpi_get_handle(device->handle, "_RMV", &temp);
885         if (ACPI_SUCCESS(status))
886                 device->flags.removable = 1;
887
888         /* Presence of _EJD|_EJ0 indicates 'ejectable' */
889         status = acpi_get_handle(device->handle, "_EJD", &temp);
890         if (ACPI_SUCCESS(status))
891                 device->flags.ejectable = 1;
892         else {
893                 status = acpi_get_handle(device->handle, "_EJ0", &temp);
894                 if (ACPI_SUCCESS(status))
895                         device->flags.ejectable = 1;
896         }
897
898         /* Presence of _LCK indicates 'lockable' */
899         status = acpi_get_handle(device->handle, "_LCK", &temp);
900         if (ACPI_SUCCESS(status))
901                 device->flags.lockable = 1;
902
903         /* Presence of _PS0|_PR0 indicates 'power manageable' */
904         status = acpi_get_handle(device->handle, "_PS0", &temp);
905         if (ACPI_FAILURE(status))
906                 status = acpi_get_handle(device->handle, "_PR0", &temp);
907         if (ACPI_SUCCESS(status))
908                 device->flags.power_manageable = 1;
909
910         /* Presence of _PRW indicates wake capable */
911         status = acpi_get_handle(device->handle, "_PRW", &temp);
912         if (ACPI_SUCCESS(status))
913                 device->flags.wake_capable = 1;
914
915         /* TBD: Performance management */
916
917         return 0;
918 }
919
920 static void acpi_device_get_busid(struct acpi_device *device,
921                                   acpi_handle handle, int type)
922 {
923         char bus_id[5] = { '?', 0 };
924         struct acpi_buffer buffer = { sizeof(bus_id), bus_id };
925         int i = 0;
926
927         /*
928          * Bus ID
929          * ------
930          * The device's Bus ID is simply the object name.
931          * TBD: Shouldn't this value be unique (within the ACPI namespace)?
932          */
933         switch (type) {
934         case ACPI_BUS_TYPE_SYSTEM:
935                 strcpy(device->pnp.bus_id, "ACPI");
936                 break;
937         case ACPI_BUS_TYPE_POWER_BUTTON:
938                 strcpy(device->pnp.bus_id, "PWRF");
939                 break;
940         case ACPI_BUS_TYPE_SLEEP_BUTTON:
941                 strcpy(device->pnp.bus_id, "SLPF");
942                 break;
943         default:
944                 acpi_get_name(handle, ACPI_SINGLE_NAME, &buffer);
945                 /* Clean up trailing underscores (if any) */
946                 for (i = 3; i > 1; i--) {
947                         if (bus_id[i] == '_')
948                                 bus_id[i] = '\0';
949                         else
950                                 break;
951                 }
952                 strcpy(device->pnp.bus_id, bus_id);
953                 break;
954         }
955 }
956
957 /*
958  * acpi_bay_match - see if a device is an ejectable driver bay
959  *
960  * If an acpi object is ejectable and has one of the ACPI ATA methods defined,
961  * then we can safely call it an ejectable drive bay
962  */
963 static int acpi_bay_match(struct acpi_device *device){
964         acpi_status status;
965         acpi_handle handle;
966         acpi_handle tmp;
967         acpi_handle phandle;
968
969         handle = device->handle;
970
971         status = acpi_get_handle(handle, "_EJ0", &tmp);
972         if (ACPI_FAILURE(status))
973                 return -ENODEV;
974
975         if ((ACPI_SUCCESS(acpi_get_handle(handle, "_GTF", &tmp))) ||
976                 (ACPI_SUCCESS(acpi_get_handle(handle, "_GTM", &tmp))) ||
977                 (ACPI_SUCCESS(acpi_get_handle(handle, "_STM", &tmp))) ||
978                 (ACPI_SUCCESS(acpi_get_handle(handle, "_SDD", &tmp))))
979                 return 0;
980
981         if (acpi_get_parent(handle, &phandle))
982                 return -ENODEV;
983
984         if ((ACPI_SUCCESS(acpi_get_handle(phandle, "_GTF", &tmp))) ||
985                 (ACPI_SUCCESS(acpi_get_handle(phandle, "_GTM", &tmp))) ||
986                 (ACPI_SUCCESS(acpi_get_handle(phandle, "_STM", &tmp))) ||
987                 (ACPI_SUCCESS(acpi_get_handle(phandle, "_SDD", &tmp))))
988                 return 0;
989
990         return -ENODEV;
991 }
992
993 /*
994  * acpi_dock_match - see if a device has a _DCK method
995  */
996 static int acpi_dock_match(struct acpi_device *device)
997 {
998         acpi_handle tmp;
999         return acpi_get_handle(device->handle, "_DCK", &tmp);
1000 }
1001
1002 static struct acpica_device_id_list*
1003 acpi_add_cid(
1004         struct acpi_device_info         *info,
1005         struct acpica_device_id         *new_cid)
1006 {
1007         struct acpica_device_id_list    *cid;
1008         char                            *next_id_string;
1009         acpi_size                       cid_length;
1010         acpi_size                       new_cid_length;
1011         u32                             i;
1012
1013
1014         /* Allocate new CID list with room for the new CID */
1015
1016         if (!new_cid)
1017                 new_cid_length = info->compatible_id_list.list_size;
1018         else if (info->compatible_id_list.list_size)
1019                 new_cid_length = info->compatible_id_list.list_size +
1020                         new_cid->length + sizeof(struct acpica_device_id);
1021         else
1022                 new_cid_length = sizeof(struct acpica_device_id_list) + new_cid->length;
1023
1024         cid = ACPI_ALLOCATE_ZEROED(new_cid_length);
1025         if (!cid) {
1026                 return NULL;
1027         }
1028
1029         cid->list_size = new_cid_length;
1030         cid->count = info->compatible_id_list.count;
1031         if (new_cid)
1032                 cid->count++;
1033         next_id_string = (char *) cid->ids + (cid->count * sizeof(struct acpica_device_id));
1034
1035         /* Copy all existing CIDs */
1036
1037         for (i = 0; i < info->compatible_id_list.count; i++) {
1038                 cid_length = info->compatible_id_list.ids[i].length;
1039                 cid->ids[i].string = next_id_string;
1040                 cid->ids[i].length = cid_length;
1041
1042                 ACPI_MEMCPY(next_id_string, info->compatible_id_list.ids[i].string,
1043                         cid_length);
1044
1045                 next_id_string += cid_length;
1046         }
1047
1048         /* Append the new CID */
1049
1050         if (new_cid) {
1051                 cid->ids[i].string = next_id_string;
1052                 cid->ids[i].length = new_cid->length;
1053
1054                 ACPI_MEMCPY(next_id_string, new_cid->string, new_cid->length);
1055         }
1056
1057         return cid;
1058 }
1059
1060 static void acpi_device_set_id(struct acpi_device *device,
1061                                struct acpi_device *parent, acpi_handle handle,
1062                                int type)
1063 {
1064         struct acpi_device_info *info = NULL;
1065         char *hid = NULL;
1066         char *uid = NULL;
1067         struct acpica_device_id_list *cid_list = NULL;
1068         char *cid_add = NULL;
1069         acpi_status status;
1070
1071         switch (type) {
1072         case ACPI_BUS_TYPE_DEVICE:
1073                 status = acpi_get_object_info(handle, &info);
1074                 if (ACPI_FAILURE(status)) {
1075                         printk(KERN_ERR PREFIX "%s: Error reading device info\n", __func__);
1076                         return;
1077                 }
1078
1079                 if (info->valid & ACPI_VALID_HID)
1080                         hid = info->hardware_id.string;
1081                 if (info->valid & ACPI_VALID_UID)
1082                         uid = info->unique_id.string;
1083                 if (info->valid & ACPI_VALID_CID)
1084                         cid_list = &info->compatible_id_list;
1085                 if (info->valid & ACPI_VALID_ADR) {
1086                         device->pnp.bus_address = info->address;
1087                         device->flags.bus_address = 1;
1088                 }
1089
1090                 /* If we have a video/bay/dock device, add our selfdefined
1091                    HID to the CID list. Like that the video/bay/dock drivers
1092                    will get autoloaded and the device might still match
1093                    against another driver.
1094                 */
1095                 if (acpi_is_video_device(device))
1096                         cid_add = ACPI_VIDEO_HID;
1097                 else if (ACPI_SUCCESS(acpi_bay_match(device)))
1098                         cid_add = ACPI_BAY_HID;
1099                 else if (ACPI_SUCCESS(acpi_dock_match(device)))
1100                         cid_add = ACPI_DOCK_HID;
1101
1102                 break;
1103         case ACPI_BUS_TYPE_POWER:
1104                 hid = ACPI_POWER_HID;
1105                 break;
1106         case ACPI_BUS_TYPE_PROCESSOR:
1107                 hid = ACPI_PROCESSOR_OBJECT_HID;
1108                 break;
1109         case ACPI_BUS_TYPE_SYSTEM:
1110                 hid = ACPI_SYSTEM_HID;
1111                 break;
1112         case ACPI_BUS_TYPE_THERMAL:
1113                 hid = ACPI_THERMAL_HID;
1114                 break;
1115         case ACPI_BUS_TYPE_POWER_BUTTON:
1116                 hid = ACPI_BUTTON_HID_POWERF;
1117                 break;
1118         case ACPI_BUS_TYPE_SLEEP_BUTTON:
1119                 hid = ACPI_BUTTON_HID_SLEEPF;
1120                 break;
1121         }
1122
1123         /*
1124          * \_SB
1125          * ----
1126          * Fix for the system root bus device -- the only root-level device.
1127          */
1128         if (((acpi_handle)parent == ACPI_ROOT_OBJECT) && (type == ACPI_BUS_TYPE_DEVICE)) {
1129                 hid = ACPI_BUS_HID;
1130                 strcpy(device->pnp.device_name, ACPI_BUS_DEVICE_NAME);
1131                 strcpy(device->pnp.device_class, ACPI_BUS_CLASS);
1132         }
1133
1134         if (hid) {
1135                 device->pnp.hardware_id = ACPI_ALLOCATE_ZEROED(strlen (hid) + 1);
1136                 if (device->pnp.hardware_id) {
1137                         strcpy(device->pnp.hardware_id, hid);
1138                         device->flags.hardware_id = 1;
1139                 }
1140         } else
1141                 device->pnp.hardware_id = NULL;
1142
1143         if (uid) {
1144                 device->pnp.unique_id = ACPI_ALLOCATE_ZEROED(strlen (uid) + 1);
1145                 if (device->pnp.unique_id) {
1146                         strcpy(device->pnp.unique_id, uid);
1147                         device->flags.unique_id = 1;
1148                 }
1149         } else
1150                 device->pnp.unique_id = NULL;
1151
1152         if (cid_list || cid_add) {
1153                 struct acpica_device_id_list *list;
1154
1155                 if (cid_add) {
1156                         struct acpica_device_id cid;
1157                         cid.length = strlen (cid_add) + 1;
1158                         cid.string = cid_add;
1159
1160                         list = acpi_add_cid(info, &cid);
1161                 } else {
1162                         list = acpi_add_cid(info, NULL);
1163                 }
1164
1165                 if (list) {
1166                         device->pnp.cid_list = list;
1167                         if (cid_add)
1168                                 device->flags.compatible_ids = 1;
1169                 }
1170         }
1171
1172         kfree(info);
1173 }
1174
1175 static int acpi_device_set_context(struct acpi_device *device, int type)
1176 {
1177         acpi_status status = AE_OK;
1178         int result = 0;
1179         /*
1180          * Context
1181          * -------
1182          * Attach this 'struct acpi_device' to the ACPI object.  This makes
1183          * resolutions from handle->device very efficient.  Note that we need
1184          * to be careful with fixed-feature devices as they all attach to the
1185          * root object.
1186          */
1187         if (type != ACPI_BUS_TYPE_POWER_BUTTON &&
1188             type != ACPI_BUS_TYPE_SLEEP_BUTTON) {
1189                 status = acpi_attach_data(device->handle,
1190                                           acpi_bus_data_handler, device);
1191
1192                 if (ACPI_FAILURE(status)) {
1193                         printk(KERN_ERR PREFIX "Error attaching device data\n");
1194                         result = -ENODEV;
1195                 }
1196         }
1197         return result;
1198 }
1199
1200 static int acpi_bus_remove(struct acpi_device *dev, int rmdevice)
1201 {
1202         if (!dev)
1203                 return -EINVAL;
1204
1205         dev->removal_type = ACPI_BUS_REMOVAL_EJECT;
1206         device_release_driver(&dev->dev);
1207
1208         if (!rmdevice)
1209                 return 0;
1210
1211         /*
1212          * unbind _ADR-Based Devices when hot removal
1213          */
1214         if (dev->flags.bus_address) {
1215                 if ((dev->parent) && (dev->parent->ops.unbind))
1216                         dev->parent->ops.unbind(dev);
1217         }
1218         acpi_device_unregister(dev, ACPI_BUS_REMOVAL_EJECT);
1219
1220         return 0;
1221 }
1222
1223 static int
1224 acpi_add_single_object(struct acpi_device **child,
1225                        struct acpi_device *parent, acpi_handle handle, int type,
1226                         struct acpi_bus_ops *ops)
1227 {
1228         int result = 0;
1229         struct acpi_device *device = NULL;
1230
1231
1232         if (!child)
1233                 return -EINVAL;
1234
1235         device = kzalloc(sizeof(struct acpi_device), GFP_KERNEL);
1236         if (!device) {
1237                 printk(KERN_ERR PREFIX "Memory allocation error\n");
1238                 return -ENOMEM;
1239         }
1240
1241         device->handle = handle;
1242         device->parent = parent;
1243         device->bus_ops = *ops; /* workround for not call .start */
1244
1245
1246         acpi_device_get_busid(device, handle, type);
1247
1248         /*
1249          * Flags
1250          * -----
1251          * Get prior to calling acpi_bus_get_status() so we know whether
1252          * or not _STA is present.  Note that we only look for object
1253          * handles -- cannot evaluate objects until we know the device is
1254          * present and properly initialized.
1255          */
1256         result = acpi_bus_get_flags(device);
1257         if (result)
1258                 goto end;
1259
1260         /*
1261          * Status
1262          * ------
1263          * See if the device is present.  We always assume that non-Device
1264          * and non-Processor objects (e.g. thermal zones, power resources,
1265          * etc.) are present, functioning, etc. (at least when parent object
1266          * is present).  Note that _STA has a different meaning for some
1267          * objects (e.g. power resources) so we need to be careful how we use
1268          * it.
1269          */
1270         switch (type) {
1271         case ACPI_BUS_TYPE_PROCESSOR:
1272         case ACPI_BUS_TYPE_DEVICE:
1273                 result = acpi_bus_get_status(device);
1274                 if (ACPI_FAILURE(result)) {
1275                         result = -ENODEV;
1276                         goto end;
1277                 }
1278                 /*
1279                  * When the device is neither present nor functional, the
1280                  * device should not be added to Linux ACPI device tree.
1281                  * When the status of the device is not present but functinal,
1282                  * it should be added to Linux ACPI tree. For example : bay
1283                  * device , dock device.
1284                  * In such conditions it is unncessary to check whether it is
1285                  * bay device or dock device.
1286                  */
1287                 if (!device->status.present && !device->status.functional) {
1288                         result = -ENODEV;
1289                         goto end;
1290                 }
1291                 break;
1292         default:
1293                 STRUCT_TO_INT(device->status) =
1294                     ACPI_STA_DEVICE_PRESENT | ACPI_STA_DEVICE_ENABLED |
1295                     ACPI_STA_DEVICE_UI      | ACPI_STA_DEVICE_FUNCTIONING;
1296                 break;
1297         }
1298
1299         /*
1300          * Initialize Device
1301          * -----------------
1302          * TBD: Synch with Core's enumeration/initialization process.
1303          */
1304
1305         /*
1306          * Hardware ID, Unique ID, & Bus Address
1307          * -------------------------------------
1308          */
1309         acpi_device_set_id(device, parent, handle, type);
1310
1311         /*
1312          * The ACPI device is attached to acpi handle before getting
1313          * the power/wakeup/peformance flags. Otherwise OS can't get
1314          * the corresponding ACPI device by the acpi handle in the course
1315          * of getting the power/wakeup/performance flags.
1316          */
1317         result = acpi_device_set_context(device, type);
1318         if (result)
1319                 goto end;
1320
1321         /*
1322          * Power Management
1323          * ----------------
1324          */
1325         if (device->flags.power_manageable) {
1326                 result = acpi_bus_get_power_flags(device);
1327                 if (result)
1328                         goto end;
1329         }
1330
1331         /*
1332          * Wakeup device management
1333          *-----------------------
1334          */
1335         if (device->flags.wake_capable) {
1336                 result = acpi_bus_get_wakeup_device_flags(device);
1337                 if (result)
1338                         goto end;
1339         }
1340
1341         /*
1342          * Performance Management
1343          * ----------------------
1344          */
1345         if (device->flags.performance_manageable) {
1346                 result = acpi_bus_get_perf_flags(device);
1347                 if (result)
1348                         goto end;
1349         }
1350
1351
1352         result = acpi_device_register(device, parent);
1353
1354         /*
1355          * Bind _ADR-Based Devices when hot add
1356          */
1357         if (device->flags.bus_address) {
1358                 if (device->parent && device->parent->ops.bind)
1359                         device->parent->ops.bind(device);
1360         }
1361
1362 end:
1363         if (!result)
1364                 *child = device;
1365         else {
1366                 kfree(device->pnp.cid_list);
1367                 kfree(device);
1368         }
1369
1370         return result;
1371 }
1372
1373 static int acpi_bus_scan(struct acpi_device *start, struct acpi_bus_ops *ops)
1374 {
1375         acpi_status status = AE_OK;
1376         struct acpi_device *parent = NULL;
1377         struct acpi_device *child = NULL;
1378         acpi_handle phandle = NULL;
1379         acpi_handle chandle = NULL;
1380         acpi_object_type type = 0;
1381         u32 level = 1;
1382
1383
1384         if (!start)
1385                 return -EINVAL;
1386
1387         parent = start;
1388         phandle = start->handle;
1389
1390         /*
1391          * Parse through the ACPI namespace, identify all 'devices', and
1392          * create a new 'struct acpi_device' for each.
1393          */
1394         while ((level > 0) && parent) {
1395
1396                 status = acpi_get_next_object(ACPI_TYPE_ANY, phandle,
1397                                               chandle, &chandle);
1398
1399                 /*
1400                  * If this scope is exhausted then move our way back up.
1401                  */
1402                 if (ACPI_FAILURE(status)) {
1403                         level--;
1404                         chandle = phandle;
1405                         acpi_get_parent(phandle, &phandle);
1406                         if (parent->parent)
1407                                 parent = parent->parent;
1408                         continue;
1409                 }
1410
1411                 status = acpi_get_type(chandle, &type);
1412                 if (ACPI_FAILURE(status))
1413                         continue;
1414
1415                 /*
1416                  * If this is a scope object then parse it (depth-first).
1417                  */
1418                 if (type == ACPI_TYPE_LOCAL_SCOPE) {
1419                         level++;
1420                         phandle = chandle;
1421                         chandle = NULL;
1422                         continue;
1423                 }
1424
1425                 /*
1426                  * We're only interested in objects that we consider 'devices'.
1427                  */
1428                 switch (type) {
1429                 case ACPI_TYPE_DEVICE:
1430                         type = ACPI_BUS_TYPE_DEVICE;
1431                         break;
1432                 case ACPI_TYPE_PROCESSOR:
1433                         type = ACPI_BUS_TYPE_PROCESSOR;
1434                         break;
1435                 case ACPI_TYPE_THERMAL:
1436                         type = ACPI_BUS_TYPE_THERMAL;
1437                         break;
1438                 case ACPI_TYPE_POWER:
1439                         type = ACPI_BUS_TYPE_POWER;
1440                         break;
1441                 default:
1442                         continue;
1443                 }
1444
1445                 if (ops->acpi_op_add)
1446                         status = acpi_add_single_object(&child, parent,
1447                                 chandle, type, ops);
1448                 else
1449                         status = acpi_bus_get_device(chandle, &child);
1450
1451                 if (ACPI_FAILURE(status))
1452                         continue;
1453
1454                 if (ops->acpi_op_start && !(ops->acpi_op_add)) {
1455                         status = acpi_start_single_object(child);
1456                         if (ACPI_FAILURE(status))
1457                                 continue;
1458                 }
1459
1460                 /*
1461                  * If the device is present, enabled, and functioning then
1462                  * parse its scope (depth-first).  Note that we need to
1463                  * represent absent devices to facilitate PnP notifications
1464                  * -- but only the subtree head (not all of its children,
1465                  * which will be enumerated when the parent is inserted).
1466                  *
1467                  * TBD: Need notifications and other detection mechanisms
1468                  *      in place before we can fully implement this.
1469                  */
1470                  /*
1471                  * When the device is not present but functional, it is also
1472                  * necessary to scan the children of this device.
1473                  */
1474                 if (child->status.present || (!child->status.present &&
1475                                         child->status.functional)) {
1476                         status = acpi_get_next_object(ACPI_TYPE_ANY, chandle,
1477                                                       NULL, NULL);
1478                         if (ACPI_SUCCESS(status)) {
1479                                 level++;
1480                                 phandle = chandle;
1481                                 chandle = NULL;
1482                                 parent = child;
1483                         }
1484                 }
1485         }
1486
1487         return 0;
1488 }
1489
1490 int
1491 acpi_bus_add(struct acpi_device **child,
1492              struct acpi_device *parent, acpi_handle handle, int type)
1493 {
1494         int result;
1495         struct acpi_bus_ops ops;
1496
1497         memset(&ops, 0, sizeof(ops));
1498         ops.acpi_op_add = 1;
1499
1500         result = acpi_add_single_object(child, parent, handle, type, &ops);
1501         if (!result)
1502                 result = acpi_bus_scan(*child, &ops);
1503
1504         return result;
1505 }
1506 EXPORT_SYMBOL(acpi_bus_add);
1507
1508 int acpi_bus_start(struct acpi_device *device)
1509 {
1510         int result;
1511         struct acpi_bus_ops ops;
1512
1513
1514         if (!device)
1515                 return -EINVAL;
1516
1517         result = acpi_start_single_object(device);
1518         if (!result) {
1519                 memset(&ops, 0, sizeof(ops));
1520                 ops.acpi_op_start = 1;
1521                 result = acpi_bus_scan(device, &ops);
1522         }
1523         return result;
1524 }
1525 EXPORT_SYMBOL(acpi_bus_start);
1526
1527 int acpi_bus_trim(struct acpi_device *start, int rmdevice)
1528 {
1529         acpi_status status;
1530         struct acpi_device *parent, *child;
1531         acpi_handle phandle, chandle;
1532         acpi_object_type type;
1533         u32 level = 1;
1534         int err = 0;
1535
1536         parent = start;
1537         phandle = start->handle;
1538         child = chandle = NULL;
1539
1540         while ((level > 0) && parent && (!err)) {
1541                 status = acpi_get_next_object(ACPI_TYPE_ANY, phandle,
1542                                               chandle, &chandle);
1543
1544                 /*
1545                  * If this scope is exhausted then move our way back up.
1546                  */
1547                 if (ACPI_FAILURE(status)) {
1548                         level--;
1549                         chandle = phandle;
1550                         acpi_get_parent(phandle, &phandle);
1551                         child = parent;
1552                         parent = parent->parent;
1553
1554                         if (level == 0)
1555                                 err = acpi_bus_remove(child, rmdevice);
1556                         else
1557                                 err = acpi_bus_remove(child, 1);
1558
1559                         continue;
1560                 }
1561
1562                 status = acpi_get_type(chandle, &type);
1563                 if (ACPI_FAILURE(status)) {
1564                         continue;
1565                 }
1566                 /*
1567                  * If there is a device corresponding to chandle then
1568                  * parse it (depth-first).
1569                  */
1570                 if (acpi_bus_get_device(chandle, &child) == 0) {
1571                         level++;
1572                         phandle = chandle;
1573                         chandle = NULL;
1574                         parent = child;
1575                 }
1576                 continue;
1577         }
1578         return err;
1579 }
1580 EXPORT_SYMBOL_GPL(acpi_bus_trim);
1581
1582 static int acpi_bus_scan_fixed(struct acpi_device *root)
1583 {
1584         int result = 0;
1585         struct acpi_device *device = NULL;
1586         struct acpi_bus_ops ops;
1587
1588         if (!root)
1589                 return -ENODEV;
1590
1591         memset(&ops, 0, sizeof(ops));
1592         ops.acpi_op_add = 1;
1593         ops.acpi_op_start = 1;
1594
1595         /*
1596          * Enumerate all fixed-feature devices.
1597          */
1598         if ((acpi_gbl_FADT.flags & ACPI_FADT_POWER_BUTTON) == 0) {
1599                 result = acpi_add_single_object(&device, acpi_root,
1600                                                 NULL,
1601                                                 ACPI_BUS_TYPE_POWER_BUTTON,
1602                                                 &ops);
1603         }
1604
1605         if ((acpi_gbl_FADT.flags & ACPI_FADT_SLEEP_BUTTON) == 0) {
1606                 result = acpi_add_single_object(&device, acpi_root,
1607                                                 NULL,
1608                                                 ACPI_BUS_TYPE_SLEEP_BUTTON,
1609                                                 &ops);
1610         }
1611
1612         return result;
1613 }
1614
1615 int __init acpi_scan_init(void)
1616 {
1617         int result;
1618         struct acpi_bus_ops ops;
1619
1620         memset(&ops, 0, sizeof(ops));
1621         ops.acpi_op_add = 1;
1622         ops.acpi_op_start = 1;
1623
1624         result = bus_register(&acpi_bus_type);
1625         if (result) {
1626                 /* We don't want to quit even if we failed to add suspend/resume */
1627                 printk(KERN_ERR PREFIX "Could not register bus type\n");
1628         }
1629
1630         /*
1631          * Create the root device in the bus's device tree
1632          */
1633         result = acpi_add_single_object(&acpi_root, NULL, ACPI_ROOT_OBJECT,
1634                                         ACPI_BUS_TYPE_SYSTEM, &ops);
1635         if (result)
1636                 goto Done;
1637
1638         /*
1639          * Enumerate devices in the ACPI namespace.
1640          */
1641         result = acpi_bus_scan_fixed(acpi_root);
1642
1643         if (!result)
1644                 result = acpi_bus_scan(acpi_root, &ops);
1645
1646         if (result)
1647                 acpi_device_unregister(acpi_root, ACPI_BUS_REMOVAL_NORMAL);
1648
1649 Done:
1650         return result;
1651 }