Staging: epl: remove EPLDLLEXPORT
[linux-2.6] / drivers / acpi / scan.c
1 /*
2  * scan.c - support for transforming the ACPI namespace into individual objects
3  */
4
5 #include <linux/module.h>
6 #include <linux/init.h>
7 #include <linux/kernel.h>
8 #include <linux/acpi.h>
9 #include <linux/signal.h>
10 #include <linux/kthread.h>
11
12 #include <acpi/acpi_drivers.h>
13
14 #define _COMPONENT              ACPI_BUS_COMPONENT
15 ACPI_MODULE_NAME("scan");
16 #define STRUCT_TO_INT(s)        (*((int*)&s))
17 extern struct acpi_device *acpi_root;
18
19 #define ACPI_BUS_CLASS                  "system_bus"
20 #define ACPI_BUS_HID                    "LNXSYBUS"
21 #define ACPI_BUS_DEVICE_NAME            "System Bus"
22
23 static LIST_HEAD(acpi_device_list);
24 static LIST_HEAD(acpi_bus_id_list);
25 DEFINE_SPINLOCK(acpi_device_lock);
26 LIST_HEAD(acpi_wakeup_device_list);
27
28 struct acpi_device_bus_id{
29         char bus_id[15];
30         unsigned int instance_no;
31         struct list_head node;
32 };
33
34 /*
35  * Creates hid/cid(s) string needed for modalias and uevent
36  * e.g. on a device with hid:IBM0001 and cid:ACPI0001 you get:
37  * char *modalias: "acpi:IBM0001:ACPI0001"
38 */
39 static int create_modalias(struct acpi_device *acpi_dev, char *modalias,
40                            int size)
41 {
42         int len;
43         int count;
44
45         if (!acpi_dev->flags.hardware_id && !acpi_dev->flags.compatible_ids)
46                 return -ENODEV;
47
48         len = snprintf(modalias, size, "acpi:");
49         size -= len;
50
51         if (acpi_dev->flags.hardware_id) {
52                 count = snprintf(&modalias[len], size, "%s:",
53                                  acpi_dev->pnp.hardware_id);
54                 if (count < 0 || count >= size)
55                         return -EINVAL;
56                 len += count;
57                 size -= count;
58         }
59
60         if (acpi_dev->flags.compatible_ids) {
61                 struct acpi_compatible_id_list *cid_list;
62                 int i;
63
64                 cid_list = acpi_dev->pnp.cid_list;
65                 for (i = 0; i < cid_list->count; i++) {
66                         count = snprintf(&modalias[len], size, "%s:",
67                                          cid_list->id[i].value);
68                         if (count < 0 || count >= size) {
69                                 printk(KERN_ERR PREFIX "%s cid[%i] exceeds event buffer size",
70                                        acpi_dev->pnp.device_name, i);
71                                 break;
72                         }
73                         len += count;
74                         size -= count;
75                 }
76         }
77
78         modalias[len] = '\0';
79         return len;
80 }
81
82 static ssize_t
83 acpi_device_modalias_show(struct device *dev, struct device_attribute *attr, char *buf) {
84         struct acpi_device *acpi_dev = to_acpi_device(dev);
85         int len;
86
87         /* Device has no HID and no CID or string is >1024 */
88         len = create_modalias(acpi_dev, buf, 1024);
89         if (len <= 0)
90                 return 0;
91         buf[len++] = '\n';
92         return len;
93 }
94 static DEVICE_ATTR(modalias, 0444, acpi_device_modalias_show, NULL);
95
96 static int acpi_bus_hot_remove_device(void *context)
97 {
98         struct acpi_device *device;
99         acpi_handle handle = context;
100         struct acpi_object_list arg_list;
101         union acpi_object arg;
102         acpi_status status = AE_OK;
103
104         if (acpi_bus_get_device(handle, &device))
105                 return 0;
106
107         if (!device)
108                 return 0;
109
110         ACPI_DEBUG_PRINT((ACPI_DB_INFO,
111                 "Hot-removing device %s...\n", dev_name(&device->dev)));
112
113         if (acpi_bus_trim(device, 1)) {
114                 printk(KERN_ERR PREFIX
115                                 "Removing device failed\n");
116                 return -1;
117         }
118
119         /* power off device */
120         status = acpi_evaluate_object(handle, "_PS3", NULL, NULL);
121         if (ACPI_FAILURE(status) && status != AE_NOT_FOUND)
122                 printk(KERN_WARNING PREFIX
123                                 "Power-off device failed\n");
124
125         if (device->flags.lockable) {
126                 arg_list.count = 1;
127                 arg_list.pointer = &arg;
128                 arg.type = ACPI_TYPE_INTEGER;
129                 arg.integer.value = 0;
130                 acpi_evaluate_object(handle, "_LCK", &arg_list, NULL);
131         }
132
133         arg_list.count = 1;
134         arg_list.pointer = &arg;
135         arg.type = ACPI_TYPE_INTEGER;
136         arg.integer.value = 1;
137
138         /*
139          * TBD: _EJD support.
140          */
141         status = acpi_evaluate_object(handle, "_EJ0", &arg_list, NULL);
142         if (ACPI_FAILURE(status))
143                 return -ENODEV;
144
145         return 0;
146 }
147
148 static ssize_t
149 acpi_eject_store(struct device *d, struct device_attribute *attr,
150                 const char *buf, size_t count)
151 {
152         int ret = count;
153         acpi_status status;
154         acpi_object_type type = 0;
155         struct acpi_device *acpi_device = to_acpi_device(d);
156         struct task_struct *task;
157
158         if ((!count) || (buf[0] != '1')) {
159                 return -EINVAL;
160         }
161 #ifndef FORCE_EJECT
162         if (acpi_device->driver == NULL) {
163                 ret = -ENODEV;
164                 goto err;
165         }
166 #endif
167         status = acpi_get_type(acpi_device->handle, &type);
168         if (ACPI_FAILURE(status) || (!acpi_device->flags.ejectable)) {
169                 ret = -ENODEV;
170                 goto err;
171         }
172
173         /* remove the device in another thread to fix the deadlock issue */
174         task = kthread_run(acpi_bus_hot_remove_device,
175                                 acpi_device->handle, "acpi_hot_remove_device");
176         if (IS_ERR(task))
177                 ret = PTR_ERR(task);
178 err:
179         return ret;
180 }
181
182 static DEVICE_ATTR(eject, 0200, NULL, acpi_eject_store);
183
184 static ssize_t
185 acpi_device_hid_show(struct device *dev, struct device_attribute *attr, char *buf) {
186         struct acpi_device *acpi_dev = to_acpi_device(dev);
187
188         return sprintf(buf, "%s\n", acpi_dev->pnp.hardware_id);
189 }
190 static DEVICE_ATTR(hid, 0444, acpi_device_hid_show, NULL);
191
192 static ssize_t
193 acpi_device_path_show(struct device *dev, struct device_attribute *attr, char *buf) {
194         struct acpi_device *acpi_dev = to_acpi_device(dev);
195         struct acpi_buffer path = {ACPI_ALLOCATE_BUFFER, NULL};
196         int result;
197
198         result = acpi_get_name(acpi_dev->handle, ACPI_FULL_PATHNAME, &path);
199         if(result)
200                 goto end;
201
202         result = sprintf(buf, "%s\n", (char*)path.pointer);
203         kfree(path.pointer);
204   end:
205         return result;
206 }
207 static DEVICE_ATTR(path, 0444, acpi_device_path_show, NULL);
208
209 static int acpi_device_setup_files(struct acpi_device *dev)
210 {
211         acpi_status status;
212         acpi_handle temp;
213         int result = 0;
214
215         /*
216          * Devices gotten from FADT don't have a "path" attribute
217          */
218         if(dev->handle) {
219                 result = device_create_file(&dev->dev, &dev_attr_path);
220                 if(result)
221                         goto end;
222         }
223
224         if(dev->flags.hardware_id) {
225                 result = device_create_file(&dev->dev, &dev_attr_hid);
226                 if(result)
227                         goto end;
228         }
229
230         if (dev->flags.hardware_id || dev->flags.compatible_ids){
231                 result = device_create_file(&dev->dev, &dev_attr_modalias);
232                 if(result)
233                         goto end;
234         }
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                 result = device_create_file(&dev->dev, &dev_attr_eject);
243   end:
244         return result;
245 }
246
247 static void acpi_device_remove_files(struct acpi_device *dev)
248 {
249         acpi_status status;
250         acpi_handle temp;
251
252         /*
253          * If device has _EJ0, 'eject' file is created that is used to trigger
254          * hot-removal function from userland.
255          */
256         status = acpi_get_handle(dev->handle, "_EJ0", &temp);
257         if (ACPI_SUCCESS(status))
258                 device_remove_file(&dev->dev, &dev_attr_eject);
259
260         if (dev->flags.hardware_id || dev->flags.compatible_ids)
261                 device_remove_file(&dev->dev, &dev_attr_modalias);
262
263         if(dev->flags.hardware_id)
264                 device_remove_file(&dev->dev, &dev_attr_hid);
265         if(dev->handle)
266                 device_remove_file(&dev->dev, &dev_attr_path);
267 }
268 /* --------------------------------------------------------------------------
269                         ACPI Bus operations
270    -------------------------------------------------------------------------- */
271
272 int acpi_match_device_ids(struct acpi_device *device,
273                           const struct acpi_device_id *ids)
274 {
275         const struct acpi_device_id *id;
276
277         /*
278          * If the device is not present, it is unnecessary to load device
279          * driver for it.
280          */
281         if (!device->status.present)
282                 return -ENODEV;
283
284         if (device->flags.hardware_id) {
285                 for (id = ids; id->id[0]; id++) {
286                         if (!strcmp((char*)id->id, device->pnp.hardware_id))
287                                 return 0;
288                 }
289         }
290
291         if (device->flags.compatible_ids) {
292                 struct acpi_compatible_id_list *cid_list = device->pnp.cid_list;
293                 int i;
294
295                 for (id = ids; id->id[0]; id++) {
296                         /* compare multiple _CID entries against driver ids */
297                         for (i = 0; i < cid_list->count; i++) {
298                                 if (!strcmp((char*)id->id,
299                                             cid_list->id[i].value))
300                                         return 0;
301                         }
302                 }
303         }
304
305         return -ENOENT;
306 }
307 EXPORT_SYMBOL(acpi_match_device_ids);
308
309 static void acpi_device_release(struct device *dev)
310 {
311         struct acpi_device *acpi_dev = to_acpi_device(dev);
312
313         kfree(acpi_dev->pnp.cid_list);
314         kfree(acpi_dev);
315 }
316
317 static int acpi_device_suspend(struct device *dev, pm_message_t state)
318 {
319         struct acpi_device *acpi_dev = to_acpi_device(dev);
320         struct acpi_driver *acpi_drv = acpi_dev->driver;
321
322         if (acpi_drv && acpi_drv->ops.suspend)
323                 return acpi_drv->ops.suspend(acpi_dev, state);
324         return 0;
325 }
326
327 static int acpi_device_resume(struct device *dev)
328 {
329         struct acpi_device *acpi_dev = to_acpi_device(dev);
330         struct acpi_driver *acpi_drv = acpi_dev->driver;
331
332         if (acpi_drv && acpi_drv->ops.resume)
333                 return acpi_drv->ops.resume(acpi_dev);
334         return 0;
335 }
336
337 static int acpi_bus_match(struct device *dev, struct device_driver *drv)
338 {
339         struct acpi_device *acpi_dev = to_acpi_device(dev);
340         struct acpi_driver *acpi_drv = to_acpi_driver(drv);
341
342         return !acpi_match_device_ids(acpi_dev, acpi_drv->ids);
343 }
344
345 static int acpi_device_uevent(struct device *dev, struct kobj_uevent_env *env)
346 {
347         struct acpi_device *acpi_dev = to_acpi_device(dev);
348         int len;
349
350         if (add_uevent_var(env, "MODALIAS="))
351                 return -ENOMEM;
352         len = create_modalias(acpi_dev, &env->buf[env->buflen - 1],
353                               sizeof(env->buf) - env->buflen);
354         if (len >= (sizeof(env->buf) - env->buflen))
355                 return -ENOMEM;
356         env->buflen += len;
357         return 0;
358 }
359
360 static int acpi_bus_driver_init(struct acpi_device *, struct acpi_driver *);
361 static int acpi_start_single_object(struct acpi_device *);
362 static int acpi_device_probe(struct device * dev)
363 {
364         struct acpi_device *acpi_dev = to_acpi_device(dev);
365         struct acpi_driver *acpi_drv = to_acpi_driver(dev->driver);
366         int ret;
367
368         ret = acpi_bus_driver_init(acpi_dev, acpi_drv);
369         if (!ret) {
370                 if (acpi_dev->bus_ops.acpi_op_start)
371                         acpi_start_single_object(acpi_dev);
372                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
373                         "Found driver [%s] for device [%s]\n",
374                         acpi_drv->name, acpi_dev->pnp.bus_id));
375                 get_device(dev);
376         }
377         return ret;
378 }
379
380 static int acpi_device_remove(struct device * dev)
381 {
382         struct acpi_device *acpi_dev = to_acpi_device(dev);
383         struct acpi_driver *acpi_drv = acpi_dev->driver;
384
385         if (acpi_drv) {
386                 if (acpi_drv->ops.stop)
387                         acpi_drv->ops.stop(acpi_dev, acpi_dev->removal_type);
388                 if (acpi_drv->ops.remove)
389                         acpi_drv->ops.remove(acpi_dev, acpi_dev->removal_type);
390         }
391         acpi_dev->driver = NULL;
392         acpi_dev->driver_data = NULL;
393
394         put_device(dev);
395         return 0;
396 }
397
398 static void acpi_device_shutdown(struct device *dev)
399 {
400         struct acpi_device *acpi_dev = to_acpi_device(dev);
401         struct acpi_driver *acpi_drv = acpi_dev->driver;
402
403         if (acpi_drv && acpi_drv->ops.shutdown)
404                 acpi_drv->ops.shutdown(acpi_dev);
405
406         return ;
407 }
408
409 struct bus_type acpi_bus_type = {
410         .name           = "acpi",
411         .suspend        = acpi_device_suspend,
412         .resume         = acpi_device_resume,
413         .shutdown       = acpi_device_shutdown,
414         .match          = acpi_bus_match,
415         .probe          = acpi_device_probe,
416         .remove         = acpi_device_remove,
417         .uevent         = acpi_device_uevent,
418 };
419
420 static int acpi_device_register(struct acpi_device *device,
421                                  struct acpi_device *parent)
422 {
423         int result;
424         struct acpi_device_bus_id *acpi_device_bus_id, *new_bus_id;
425         int found = 0;
426         /*
427          * Linkage
428          * -------
429          * Link this device to its parent and siblings.
430          */
431         INIT_LIST_HEAD(&device->children);
432         INIT_LIST_HEAD(&device->node);
433         INIT_LIST_HEAD(&device->g_list);
434         INIT_LIST_HEAD(&device->wakeup_list);
435
436         new_bus_id = kzalloc(sizeof(struct acpi_device_bus_id), GFP_KERNEL);
437         if (!new_bus_id) {
438                 printk(KERN_ERR PREFIX "Memory allocation error\n");
439                 return -ENOMEM;
440         }
441
442         spin_lock(&acpi_device_lock);
443         /*
444          * Find suitable bus_id and instance number in acpi_bus_id_list
445          * If failed, create one and link it into acpi_bus_id_list
446          */
447         list_for_each_entry(acpi_device_bus_id, &acpi_bus_id_list, node) {
448                 if(!strcmp(acpi_device_bus_id->bus_id, device->flags.hardware_id? device->pnp.hardware_id : "device")) {
449                         acpi_device_bus_id->instance_no ++;
450                         found = 1;
451                         kfree(new_bus_id);
452                         break;
453                 }
454         }
455         if(!found) {
456                 acpi_device_bus_id = new_bus_id;
457                 strcpy(acpi_device_bus_id->bus_id, device->flags.hardware_id ? device->pnp.hardware_id : "device");
458                 acpi_device_bus_id->instance_no = 0;
459                 list_add_tail(&acpi_device_bus_id->node, &acpi_bus_id_list);
460         }
461         dev_set_name(&device->dev, "%s:%02x", acpi_device_bus_id->bus_id, acpi_device_bus_id->instance_no);
462
463         if (device->parent) {
464                 list_add_tail(&device->node, &device->parent->children);
465                 list_add_tail(&device->g_list, &device->parent->g_list);
466         } else
467                 list_add_tail(&device->g_list, &acpi_device_list);
468         if (device->wakeup.flags.valid)
469                 list_add_tail(&device->wakeup_list, &acpi_wakeup_device_list);
470         spin_unlock(&acpi_device_lock);
471
472         if (device->parent)
473                 device->dev.parent = &parent->dev;
474         device->dev.bus = &acpi_bus_type;
475         device_initialize(&device->dev);
476         device->dev.release = &acpi_device_release;
477         result = device_add(&device->dev);
478         if(result) {
479                 dev_err(&device->dev, "Error adding device\n");
480                 goto end;
481         }
482
483         result = acpi_device_setup_files(device);
484         if(result)
485                 printk(KERN_ERR PREFIX "Error creating sysfs interface for device %s\n",
486                        dev_name(&device->dev));
487
488         device->removal_type = ACPI_BUS_REMOVAL_NORMAL;
489         return 0;
490   end:
491         spin_lock(&acpi_device_lock);
492         if (device->parent) {
493                 list_del(&device->node);
494                 list_del(&device->g_list);
495         } else
496                 list_del(&device->g_list);
497         list_del(&device->wakeup_list);
498         spin_unlock(&acpi_device_lock);
499         return result;
500 }
501
502 static void acpi_device_unregister(struct acpi_device *device, int type)
503 {
504         spin_lock(&acpi_device_lock);
505         if (device->parent) {
506                 list_del(&device->node);
507                 list_del(&device->g_list);
508         } else
509                 list_del(&device->g_list);
510
511         list_del(&device->wakeup_list);
512         spin_unlock(&acpi_device_lock);
513
514         acpi_detach_data(device->handle, acpi_bus_data_handler);
515
516         acpi_device_remove_files(device);
517         device_unregister(&device->dev);
518 }
519
520 /* --------------------------------------------------------------------------
521                                  Driver Management
522    -------------------------------------------------------------------------- */
523 /**
524  * acpi_bus_driver_init - add a device to a driver
525  * @device: the device to add and initialize
526  * @driver: driver for the device
527  *
528  * Used to initialize a device via its device driver.  Called whenever a 
529  * driver is bound to a device.  Invokes the driver's add() ops.
530  */
531 static int
532 acpi_bus_driver_init(struct acpi_device *device, struct acpi_driver *driver)
533 {
534         int result = 0;
535
536
537         if (!device || !driver)
538                 return -EINVAL;
539
540         if (!driver->ops.add)
541                 return -ENOSYS;
542
543         result = driver->ops.add(device);
544         if (result) {
545                 device->driver = NULL;
546                 device->driver_data = NULL;
547                 return result;
548         }
549
550         device->driver = driver;
551
552         /*
553          * TBD - Configuration Management: Assign resources to device based
554          * upon possible configuration and currently allocated resources.
555          */
556
557         ACPI_DEBUG_PRINT((ACPI_DB_INFO,
558                           "Driver successfully bound to device\n"));
559         return 0;
560 }
561
562 static int acpi_start_single_object(struct acpi_device *device)
563 {
564         int result = 0;
565         struct acpi_driver *driver;
566
567
568         if (!(driver = device->driver))
569                 return 0;
570
571         if (driver->ops.start) {
572                 result = driver->ops.start(device);
573                 if (result && driver->ops.remove)
574                         driver->ops.remove(device, ACPI_BUS_REMOVAL_NORMAL);
575         }
576
577         return result;
578 }
579
580 /**
581  * acpi_bus_register_driver - register a driver with the ACPI bus
582  * @driver: driver being registered
583  *
584  * Registers a driver with the ACPI bus.  Searches the namespace for all
585  * devices that match the driver's criteria and binds.  Returns zero for
586  * success or a negative error status for failure.
587  */
588 int acpi_bus_register_driver(struct acpi_driver *driver)
589 {
590         int ret;
591
592         if (acpi_disabled)
593                 return -ENODEV;
594         driver->drv.name = driver->name;
595         driver->drv.bus = &acpi_bus_type;
596         driver->drv.owner = driver->owner;
597
598         ret = driver_register(&driver->drv);
599         return ret;
600 }
601
602 EXPORT_SYMBOL(acpi_bus_register_driver);
603
604 /**
605  * acpi_bus_unregister_driver - unregisters a driver with the APIC bus
606  * @driver: driver to unregister
607  *
608  * Unregisters a driver with the ACPI bus.  Searches the namespace for all
609  * devices that match the driver's criteria and unbinds.
610  */
611 void acpi_bus_unregister_driver(struct acpi_driver *driver)
612 {
613         driver_unregister(&driver->drv);
614 }
615
616 EXPORT_SYMBOL(acpi_bus_unregister_driver);
617
618 /* --------------------------------------------------------------------------
619                                  Device Enumeration
620    -------------------------------------------------------------------------- */
621 acpi_status
622 acpi_bus_get_ejd(acpi_handle handle, acpi_handle *ejd)
623 {
624         acpi_status status;
625         acpi_handle tmp;
626         struct acpi_buffer buffer = {ACPI_ALLOCATE_BUFFER, NULL};
627         union acpi_object *obj;
628
629         status = acpi_get_handle(handle, "_EJD", &tmp);
630         if (ACPI_FAILURE(status))
631                 return status;
632
633         status = acpi_evaluate_object(handle, "_EJD", NULL, &buffer);
634         if (ACPI_SUCCESS(status)) {
635                 obj = buffer.pointer;
636                 status = acpi_get_handle(ACPI_ROOT_OBJECT, obj->string.pointer,
637                                          ejd);
638                 kfree(buffer.pointer);
639         }
640         return status;
641 }
642 EXPORT_SYMBOL_GPL(acpi_bus_get_ejd);
643
644 void acpi_bus_data_handler(acpi_handle handle, u32 function, void *context)
645 {
646
647         /* TBD */
648
649         return;
650 }
651
652 static int acpi_bus_get_perf_flags(struct acpi_device *device)
653 {
654         device->performance.state = ACPI_STATE_UNKNOWN;
655         return 0;
656 }
657
658 static acpi_status
659 acpi_bus_extract_wakeup_device_power_package(struct acpi_device *device,
660                                              union acpi_object *package)
661 {
662         int i = 0;
663         union acpi_object *element = NULL;
664
665         if (!device || !package || (package->package.count < 2))
666                 return AE_BAD_PARAMETER;
667
668         element = &(package->package.elements[0]);
669         if (!element)
670                 return AE_BAD_PARAMETER;
671         if (element->type == ACPI_TYPE_PACKAGE) {
672                 if ((element->package.count < 2) ||
673                     (element->package.elements[0].type !=
674                      ACPI_TYPE_LOCAL_REFERENCE)
675                     || (element->package.elements[1].type != ACPI_TYPE_INTEGER))
676                         return AE_BAD_DATA;
677                 device->wakeup.gpe_device =
678                     element->package.elements[0].reference.handle;
679                 device->wakeup.gpe_number =
680                     (u32) element->package.elements[1].integer.value;
681         } else if (element->type == ACPI_TYPE_INTEGER) {
682                 device->wakeup.gpe_number = element->integer.value;
683         } else
684                 return AE_BAD_DATA;
685
686         element = &(package->package.elements[1]);
687         if (element->type != ACPI_TYPE_INTEGER) {
688                 return AE_BAD_DATA;
689         }
690         device->wakeup.sleep_state = element->integer.value;
691
692         if ((package->package.count - 2) > ACPI_MAX_HANDLES) {
693                 return AE_NO_MEMORY;
694         }
695         device->wakeup.resources.count = package->package.count - 2;
696         for (i = 0; i < device->wakeup.resources.count; i++) {
697                 element = &(package->package.elements[i + 2]);
698                 if (element->type != ACPI_TYPE_LOCAL_REFERENCE)
699                         return AE_BAD_DATA;
700
701                 device->wakeup.resources.handles[i] = element->reference.handle;
702         }
703
704         return AE_OK;
705 }
706
707 static int acpi_bus_get_wakeup_device_flags(struct acpi_device *device)
708 {
709         acpi_status status = 0;
710         struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
711         union acpi_object *package = NULL;
712         int psw_error;
713
714         struct acpi_device_id button_device_ids[] = {
715                 {"PNP0C0D", 0},
716                 {"PNP0C0C", 0},
717                 {"PNP0C0E", 0},
718                 {"", 0},
719         };
720
721         /* _PRW */
722         status = acpi_evaluate_object(device->handle, "_PRW", NULL, &buffer);
723         if (ACPI_FAILURE(status)) {
724                 ACPI_EXCEPTION((AE_INFO, status, "Evaluating _PRW"));
725                 goto end;
726         }
727
728         package = (union acpi_object *)buffer.pointer;
729         status = acpi_bus_extract_wakeup_device_power_package(device, package);
730         if (ACPI_FAILURE(status)) {
731                 ACPI_EXCEPTION((AE_INFO, status, "Extracting _PRW package"));
732                 goto end;
733         }
734
735         kfree(buffer.pointer);
736
737         device->wakeup.flags.valid = 1;
738         /* Call _PSW/_DSW object to disable its ability to wake the sleeping
739          * system for the ACPI device with the _PRW object.
740          * The _PSW object is depreciated in ACPI 3.0 and is replaced by _DSW.
741          * So it is necessary to call _DSW object first. Only when it is not
742          * present will the _PSW object used.
743          */
744         psw_error = acpi_device_sleep_wake(device, 0, 0, 0);
745         if (psw_error)
746                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
747                                 "error in _DSW or _PSW evaluation\n"));
748
749         /* Power button, Lid switch always enable wakeup */
750         if (!acpi_match_device_ids(device, button_device_ids))
751                 device->wakeup.flags.run_wake = 1;
752
753       end:
754         if (ACPI_FAILURE(status))
755                 device->flags.wake_capable = 0;
756         return 0;
757 }
758
759 static int acpi_bus_get_power_flags(struct acpi_device *device)
760 {
761         acpi_status status = 0;
762         acpi_handle handle = NULL;
763         u32 i = 0;
764
765
766         /*
767          * Power Management Flags
768          */
769         status = acpi_get_handle(device->handle, "_PSC", &handle);
770         if (ACPI_SUCCESS(status))
771                 device->power.flags.explicit_get = 1;
772         status = acpi_get_handle(device->handle, "_IRC", &handle);
773         if (ACPI_SUCCESS(status))
774                 device->power.flags.inrush_current = 1;
775
776         /*
777          * Enumerate supported power management states
778          */
779         for (i = ACPI_STATE_D0; i <= ACPI_STATE_D3; i++) {
780                 struct acpi_device_power_state *ps = &device->power.states[i];
781                 char object_name[5] = { '_', 'P', 'R', '0' + i, '\0' };
782
783                 /* Evaluate "_PRx" to se if power resources are referenced */
784                 acpi_evaluate_reference(device->handle, object_name, NULL,
785                                         &ps->resources);
786                 if (ps->resources.count) {
787                         device->power.flags.power_resources = 1;
788                         ps->flags.valid = 1;
789                 }
790
791                 /* Evaluate "_PSx" to see if we can do explicit sets */
792                 object_name[2] = 'S';
793                 status = acpi_get_handle(device->handle, object_name, &handle);
794                 if (ACPI_SUCCESS(status)) {
795                         ps->flags.explicit_set = 1;
796                         ps->flags.valid = 1;
797                 }
798
799                 /* State is valid if we have some power control */
800                 if (ps->resources.count || ps->flags.explicit_set)
801                         ps->flags.valid = 1;
802
803                 ps->power = -1; /* Unknown - driver assigned */
804                 ps->latency = -1;       /* Unknown - driver assigned */
805         }
806
807         /* Set defaults for D0 and D3 states (always valid) */
808         device->power.states[ACPI_STATE_D0].flags.valid = 1;
809         device->power.states[ACPI_STATE_D0].power = 100;
810         device->power.states[ACPI_STATE_D3].flags.valid = 1;
811         device->power.states[ACPI_STATE_D3].power = 0;
812
813         /* TBD: System wake support and resource requirements. */
814
815         device->power.state = ACPI_STATE_UNKNOWN;
816         acpi_bus_get_power(device->handle, &(device->power.state));
817
818         return 0;
819 }
820
821 static int acpi_bus_get_flags(struct acpi_device *device)
822 {
823         acpi_status status = AE_OK;
824         acpi_handle temp = NULL;
825
826
827         /* Presence of _STA indicates 'dynamic_status' */
828         status = acpi_get_handle(device->handle, "_STA", &temp);
829         if (ACPI_SUCCESS(status))
830                 device->flags.dynamic_status = 1;
831
832         /* Presence of _CID indicates 'compatible_ids' */
833         status = acpi_get_handle(device->handle, "_CID", &temp);
834         if (ACPI_SUCCESS(status))
835                 device->flags.compatible_ids = 1;
836
837         /* Presence of _RMV indicates 'removable' */
838         status = acpi_get_handle(device->handle, "_RMV", &temp);
839         if (ACPI_SUCCESS(status))
840                 device->flags.removable = 1;
841
842         /* Presence of _EJD|_EJ0 indicates 'ejectable' */
843         status = acpi_get_handle(device->handle, "_EJD", &temp);
844         if (ACPI_SUCCESS(status))
845                 device->flags.ejectable = 1;
846         else {
847                 status = acpi_get_handle(device->handle, "_EJ0", &temp);
848                 if (ACPI_SUCCESS(status))
849                         device->flags.ejectable = 1;
850         }
851
852         /* Presence of _LCK indicates 'lockable' */
853         status = acpi_get_handle(device->handle, "_LCK", &temp);
854         if (ACPI_SUCCESS(status))
855                 device->flags.lockable = 1;
856
857         /* Presence of _PS0|_PR0 indicates 'power manageable' */
858         status = acpi_get_handle(device->handle, "_PS0", &temp);
859         if (ACPI_FAILURE(status))
860                 status = acpi_get_handle(device->handle, "_PR0", &temp);
861         if (ACPI_SUCCESS(status))
862                 device->flags.power_manageable = 1;
863
864         /* Presence of _PRW indicates wake capable */
865         status = acpi_get_handle(device->handle, "_PRW", &temp);
866         if (ACPI_SUCCESS(status))
867                 device->flags.wake_capable = 1;
868
869         /* TBD: Performance management */
870
871         return 0;
872 }
873
874 static void acpi_device_get_busid(struct acpi_device *device,
875                                   acpi_handle handle, int type)
876 {
877         char bus_id[5] = { '?', 0 };
878         struct acpi_buffer buffer = { sizeof(bus_id), bus_id };
879         int i = 0;
880
881         /*
882          * Bus ID
883          * ------
884          * The device's Bus ID is simply the object name.
885          * TBD: Shouldn't this value be unique (within the ACPI namespace)?
886          */
887         switch (type) {
888         case ACPI_BUS_TYPE_SYSTEM:
889                 strcpy(device->pnp.bus_id, "ACPI");
890                 break;
891         case ACPI_BUS_TYPE_POWER_BUTTON:
892                 strcpy(device->pnp.bus_id, "PWRF");
893                 break;
894         case ACPI_BUS_TYPE_SLEEP_BUTTON:
895                 strcpy(device->pnp.bus_id, "SLPF");
896                 break;
897         default:
898                 acpi_get_name(handle, ACPI_SINGLE_NAME, &buffer);
899                 /* Clean up trailing underscores (if any) */
900                 for (i = 3; i > 1; i--) {
901                         if (bus_id[i] == '_')
902                                 bus_id[i] = '\0';
903                         else
904                                 break;
905                 }
906                 strcpy(device->pnp.bus_id, bus_id);
907                 break;
908         }
909 }
910
911 /*
912  * acpi_bay_match - see if a device is an ejectable driver bay
913  *
914  * If an acpi object is ejectable and has one of the ACPI ATA methods defined,
915  * then we can safely call it an ejectable drive bay
916  */
917 static int acpi_bay_match(struct acpi_device *device){
918         acpi_status status;
919         acpi_handle handle;
920         acpi_handle tmp;
921         acpi_handle phandle;
922
923         handle = device->handle;
924
925         status = acpi_get_handle(handle, "_EJ0", &tmp);
926         if (ACPI_FAILURE(status))
927                 return -ENODEV;
928
929         if ((ACPI_SUCCESS(acpi_get_handle(handle, "_GTF", &tmp))) ||
930                 (ACPI_SUCCESS(acpi_get_handle(handle, "_GTM", &tmp))) ||
931                 (ACPI_SUCCESS(acpi_get_handle(handle, "_STM", &tmp))) ||
932                 (ACPI_SUCCESS(acpi_get_handle(handle, "_SDD", &tmp))))
933                 return 0;
934
935         if (acpi_get_parent(handle, &phandle))
936                 return -ENODEV;
937
938         if ((ACPI_SUCCESS(acpi_get_handle(phandle, "_GTF", &tmp))) ||
939                 (ACPI_SUCCESS(acpi_get_handle(phandle, "_GTM", &tmp))) ||
940                 (ACPI_SUCCESS(acpi_get_handle(phandle, "_STM", &tmp))) ||
941                 (ACPI_SUCCESS(acpi_get_handle(phandle, "_SDD", &tmp))))
942                 return 0;
943
944         return -ENODEV;
945 }
946
947 /*
948  * acpi_dock_match - see if a device has a _DCK method
949  */
950 static int acpi_dock_match(struct acpi_device *device)
951 {
952         acpi_handle tmp;
953         return acpi_get_handle(device->handle, "_DCK", &tmp);
954 }
955
956 static void acpi_device_set_id(struct acpi_device *device,
957                                struct acpi_device *parent, acpi_handle handle,
958                                int type)
959 {
960         struct acpi_device_info *info;
961         struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
962         char *hid = NULL;
963         char *uid = NULL;
964         struct acpi_compatible_id_list *cid_list = NULL;
965         const char *cid_add = NULL;
966         acpi_status status;
967
968         switch (type) {
969         case ACPI_BUS_TYPE_DEVICE:
970                 status = acpi_get_object_info(handle, &buffer);
971                 if (ACPI_FAILURE(status)) {
972                         printk(KERN_ERR PREFIX "%s: Error reading device info\n", __func__);
973                         return;
974                 }
975
976                 info = buffer.pointer;
977                 if (info->valid & ACPI_VALID_HID)
978                         hid = info->hardware_id.value;
979                 if (info->valid & ACPI_VALID_UID)
980                         uid = info->unique_id.value;
981                 if (info->valid & ACPI_VALID_CID)
982                         cid_list = &info->compatibility_id;
983                 if (info->valid & ACPI_VALID_ADR) {
984                         device->pnp.bus_address = info->address;
985                         device->flags.bus_address = 1;
986                 }
987
988                 /* If we have a video/bay/dock device, add our selfdefined
989                    HID to the CID list. Like that the video/bay/dock drivers
990                    will get autoloaded and the device might still match
991                    against another driver.
992                 */
993                 if (acpi_is_video_device(device))
994                         cid_add = ACPI_VIDEO_HID;
995                 else if (ACPI_SUCCESS(acpi_bay_match(device)))
996                         cid_add = ACPI_BAY_HID;
997                 else if (ACPI_SUCCESS(acpi_dock_match(device)))
998                         cid_add = ACPI_DOCK_HID;
999
1000                 break;
1001         case ACPI_BUS_TYPE_POWER:
1002                 hid = ACPI_POWER_HID;
1003                 break;
1004         case ACPI_BUS_TYPE_PROCESSOR:
1005                 hid = ACPI_PROCESSOR_OBJECT_HID;
1006                 break;
1007         case ACPI_BUS_TYPE_SYSTEM:
1008                 hid = ACPI_SYSTEM_HID;
1009                 break;
1010         case ACPI_BUS_TYPE_THERMAL:
1011                 hid = ACPI_THERMAL_HID;
1012                 break;
1013         case ACPI_BUS_TYPE_POWER_BUTTON:
1014                 hid = ACPI_BUTTON_HID_POWERF;
1015                 break;
1016         case ACPI_BUS_TYPE_SLEEP_BUTTON:
1017                 hid = ACPI_BUTTON_HID_SLEEPF;
1018                 break;
1019         }
1020
1021         /* 
1022          * \_SB
1023          * ----
1024          * Fix for the system root bus device -- the only root-level device.
1025          */
1026         if (((acpi_handle)parent == ACPI_ROOT_OBJECT) && (type == ACPI_BUS_TYPE_DEVICE)) {
1027                 hid = ACPI_BUS_HID;
1028                 strcpy(device->pnp.device_name, ACPI_BUS_DEVICE_NAME);
1029                 strcpy(device->pnp.device_class, ACPI_BUS_CLASS);
1030         }
1031
1032         if (hid) {
1033                 strcpy(device->pnp.hardware_id, hid);
1034                 device->flags.hardware_id = 1;
1035         }
1036         if (uid) {
1037                 strcpy(device->pnp.unique_id, uid);
1038                 device->flags.unique_id = 1;
1039         }
1040         if (cid_list || cid_add) {
1041                 struct  acpi_compatible_id_list *list;
1042                 int size = 0;
1043                 int count = 0;
1044
1045                 if (cid_list) {
1046                         size = cid_list->size;
1047                 } else if (cid_add) {
1048                         size = sizeof(struct acpi_compatible_id_list);
1049                         cid_list = ACPI_ALLOCATE_ZEROED((acpi_size) size);
1050                         if (!cid_list) {
1051                                 printk(KERN_ERR "Memory allocation error\n");
1052                                 kfree(buffer.pointer);
1053                                 return;
1054                         } else {
1055                                 cid_list->count = 0;
1056                                 cid_list->size = size;
1057                         }
1058                 }
1059                 if (cid_add)
1060                         size += sizeof(struct acpi_compatible_id);
1061                 list = kmalloc(size, GFP_KERNEL);
1062
1063                 if (list) {
1064                         if (cid_list) {
1065                                 memcpy(list, cid_list, cid_list->size);
1066                                 count = cid_list->count;
1067                         }
1068                         if (cid_add) {
1069                                 strncpy(list->id[count].value, cid_add,
1070                                         ACPI_MAX_CID_LENGTH);
1071                                 count++;
1072                                 device->flags.compatible_ids = 1;
1073                         }
1074                         list->size = size;
1075                         list->count = count;
1076                         device->pnp.cid_list = list;
1077                 } else
1078                         printk(KERN_ERR PREFIX "Memory allocation error\n");
1079         }
1080
1081         kfree(buffer.pointer);
1082 }
1083
1084 static int acpi_device_set_context(struct acpi_device *device, int type)
1085 {
1086         acpi_status status = AE_OK;
1087         int result = 0;
1088         /*
1089          * Context
1090          * -------
1091          * Attach this 'struct acpi_device' to the ACPI object.  This makes
1092          * resolutions from handle->device very efficient.  Note that we need
1093          * to be careful with fixed-feature devices as they all attach to the
1094          * root object.
1095          */
1096         if (type != ACPI_BUS_TYPE_POWER_BUTTON &&
1097             type != ACPI_BUS_TYPE_SLEEP_BUTTON) {
1098                 status = acpi_attach_data(device->handle,
1099                                           acpi_bus_data_handler, device);
1100
1101                 if (ACPI_FAILURE(status)) {
1102                         printk(KERN_ERR PREFIX "Error attaching device data\n");
1103                         result = -ENODEV;
1104                 }
1105         }
1106         return result;
1107 }
1108
1109 static int acpi_bus_remove(struct acpi_device *dev, int rmdevice)
1110 {
1111         if (!dev)
1112                 return -EINVAL;
1113
1114         dev->removal_type = ACPI_BUS_REMOVAL_EJECT;
1115         device_release_driver(&dev->dev);
1116
1117         if (!rmdevice)
1118                 return 0;
1119
1120         /*
1121          * unbind _ADR-Based Devices when hot removal
1122          */
1123         if (dev->flags.bus_address) {
1124                 if ((dev->parent) && (dev->parent->ops.unbind))
1125                         dev->parent->ops.unbind(dev);
1126         }
1127         acpi_device_unregister(dev, ACPI_BUS_REMOVAL_EJECT);
1128
1129         return 0;
1130 }
1131
1132 static int
1133 acpi_add_single_object(struct acpi_device **child,
1134                        struct acpi_device *parent, acpi_handle handle, int type,
1135                         struct acpi_bus_ops *ops)
1136 {
1137         int result = 0;
1138         struct acpi_device *device = NULL;
1139
1140
1141         if (!child)
1142                 return -EINVAL;
1143
1144         device = kzalloc(sizeof(struct acpi_device), GFP_KERNEL);
1145         if (!device) {
1146                 printk(KERN_ERR PREFIX "Memory allocation error\n");
1147                 return -ENOMEM;
1148         }
1149
1150         device->handle = handle;
1151         device->parent = parent;
1152         device->bus_ops = *ops; /* workround for not call .start */
1153
1154
1155         acpi_device_get_busid(device, handle, type);
1156
1157         /*
1158          * Flags
1159          * -----
1160          * Get prior to calling acpi_bus_get_status() so we know whether
1161          * or not _STA is present.  Note that we only look for object
1162          * handles -- cannot evaluate objects until we know the device is
1163          * present and properly initialized.
1164          */
1165         result = acpi_bus_get_flags(device);
1166         if (result)
1167                 goto end;
1168
1169         /*
1170          * Status
1171          * ------
1172          * See if the device is present.  We always assume that non-Device
1173          * and non-Processor objects (e.g. thermal zones, power resources,
1174          * etc.) are present, functioning, etc. (at least when parent object
1175          * is present).  Note that _STA has a different meaning for some
1176          * objects (e.g. power resources) so we need to be careful how we use
1177          * it.
1178          */
1179         switch (type) {
1180         case ACPI_BUS_TYPE_PROCESSOR:
1181         case ACPI_BUS_TYPE_DEVICE:
1182                 result = acpi_bus_get_status(device);
1183                 if (ACPI_FAILURE(result)) {
1184                         result = -ENODEV;
1185                         goto end;
1186                 }
1187                 /*
1188                  * When the device is neither present nor functional, the
1189                  * device should not be added to Linux ACPI device tree.
1190                  * When the status of the device is not present but functinal,
1191                  * it should be added to Linux ACPI tree. For example : bay
1192                  * device , dock device.
1193                  * In such conditions it is unncessary to check whether it is
1194                  * bay device or dock device.
1195                  */
1196                 if (!device->status.present && !device->status.functional) {
1197                         result = -ENODEV;
1198                         goto end;
1199                 }
1200                 break;
1201         default:
1202                 STRUCT_TO_INT(device->status) =
1203                     ACPI_STA_DEVICE_PRESENT | ACPI_STA_DEVICE_ENABLED |
1204                     ACPI_STA_DEVICE_UI      | ACPI_STA_DEVICE_FUNCTIONING;
1205                 break;
1206         }
1207
1208         /*
1209          * Initialize Device
1210          * -----------------
1211          * TBD: Synch with Core's enumeration/initialization process.
1212          */
1213
1214         /*
1215          * Hardware ID, Unique ID, & Bus Address
1216          * -------------------------------------
1217          */
1218         acpi_device_set_id(device, parent, handle, type);
1219
1220         /*
1221          * The ACPI device is attached to acpi handle before getting
1222          * the power/wakeup/peformance flags. Otherwise OS can't get
1223          * the corresponding ACPI device by the acpi handle in the course
1224          * of getting the power/wakeup/performance flags.
1225          */
1226         result = acpi_device_set_context(device, type);
1227         if (result)
1228                 goto end;
1229
1230         /*
1231          * Power Management
1232          * ----------------
1233          */
1234         if (device->flags.power_manageable) {
1235                 result = acpi_bus_get_power_flags(device);
1236                 if (result)
1237                         goto end;
1238         }
1239
1240         /*
1241          * Wakeup device management
1242          *-----------------------
1243          */
1244         if (device->flags.wake_capable) {
1245                 result = acpi_bus_get_wakeup_device_flags(device);
1246                 if (result)
1247                         goto end;
1248         }
1249
1250         /*
1251          * Performance Management
1252          * ----------------------
1253          */
1254         if (device->flags.performance_manageable) {
1255                 result = acpi_bus_get_perf_flags(device);
1256                 if (result)
1257                         goto end;
1258         }
1259
1260
1261         result = acpi_device_register(device, parent);
1262
1263         /*
1264          * Bind _ADR-Based Devices when hot add
1265          */
1266         if (device->flags.bus_address) {
1267                 if (device->parent && device->parent->ops.bind)
1268                         device->parent->ops.bind(device);
1269         }
1270
1271       end:
1272         if (!result)
1273                 *child = device;
1274         else {
1275                 kfree(device->pnp.cid_list);
1276                 kfree(device);
1277         }
1278
1279         return result;
1280 }
1281
1282 static int acpi_bus_scan(struct acpi_device *start, struct acpi_bus_ops *ops)
1283 {
1284         acpi_status status = AE_OK;
1285         struct acpi_device *parent = NULL;
1286         struct acpi_device *child = NULL;
1287         acpi_handle phandle = NULL;
1288         acpi_handle chandle = NULL;
1289         acpi_object_type type = 0;
1290         u32 level = 1;
1291
1292
1293         if (!start)
1294                 return -EINVAL;
1295
1296         parent = start;
1297         phandle = start->handle;
1298
1299         /*
1300          * Parse through the ACPI namespace, identify all 'devices', and
1301          * create a new 'struct acpi_device' for each.
1302          */
1303         while ((level > 0) && parent) {
1304
1305                 status = acpi_get_next_object(ACPI_TYPE_ANY, phandle,
1306                                               chandle, &chandle);
1307
1308                 /*
1309                  * If this scope is exhausted then move our way back up.
1310                  */
1311                 if (ACPI_FAILURE(status)) {
1312                         level--;
1313                         chandle = phandle;
1314                         acpi_get_parent(phandle, &phandle);
1315                         if (parent->parent)
1316                                 parent = parent->parent;
1317                         continue;
1318                 }
1319
1320                 status = acpi_get_type(chandle, &type);
1321                 if (ACPI_FAILURE(status))
1322                         continue;
1323
1324                 /*
1325                  * If this is a scope object then parse it (depth-first).
1326                  */
1327                 if (type == ACPI_TYPE_LOCAL_SCOPE) {
1328                         level++;
1329                         phandle = chandle;
1330                         chandle = NULL;
1331                         continue;
1332                 }
1333
1334                 /*
1335                  * We're only interested in objects that we consider 'devices'.
1336                  */
1337                 switch (type) {
1338                 case ACPI_TYPE_DEVICE:
1339                         type = ACPI_BUS_TYPE_DEVICE;
1340                         break;
1341                 case ACPI_TYPE_PROCESSOR:
1342                         type = ACPI_BUS_TYPE_PROCESSOR;
1343                         break;
1344                 case ACPI_TYPE_THERMAL:
1345                         type = ACPI_BUS_TYPE_THERMAL;
1346                         break;
1347                 case ACPI_TYPE_POWER:
1348                         type = ACPI_BUS_TYPE_POWER;
1349                         break;
1350                 default:
1351                         continue;
1352                 }
1353
1354                 if (ops->acpi_op_add)
1355                         status = acpi_add_single_object(&child, parent,
1356                                 chandle, type, ops);
1357                 else
1358                         status = acpi_bus_get_device(chandle, &child);
1359
1360                 if (ACPI_FAILURE(status))
1361                         continue;
1362
1363                 if (ops->acpi_op_start && !(ops->acpi_op_add)) {
1364                         status = acpi_start_single_object(child);
1365                         if (ACPI_FAILURE(status))
1366                                 continue;
1367                 }
1368
1369                 /*
1370                  * If the device is present, enabled, and functioning then
1371                  * parse its scope (depth-first).  Note that we need to
1372                  * represent absent devices to facilitate PnP notifications
1373                  * -- but only the subtree head (not all of its children,
1374                  * which will be enumerated when the parent is inserted).
1375                  *
1376                  * TBD: Need notifications and other detection mechanisms
1377                  *      in place before we can fully implement this.
1378                  */
1379                  /*
1380                  * When the device is not present but functional, it is also
1381                  * necessary to scan the children of this device.
1382                  */
1383                 if (child->status.present || (!child->status.present &&
1384                                         child->status.functional)) {
1385                         status = acpi_get_next_object(ACPI_TYPE_ANY, chandle,
1386                                                       NULL, NULL);
1387                         if (ACPI_SUCCESS(status)) {
1388                                 level++;
1389                                 phandle = chandle;
1390                                 chandle = NULL;
1391                                 parent = child;
1392                         }
1393                 }
1394         }
1395
1396         return 0;
1397 }
1398
1399 int
1400 acpi_bus_add(struct acpi_device **child,
1401              struct acpi_device *parent, acpi_handle handle, int type)
1402 {
1403         int result;
1404         struct acpi_bus_ops ops;
1405
1406         memset(&ops, 0, sizeof(ops));
1407         ops.acpi_op_add = 1;
1408
1409         result = acpi_add_single_object(child, parent, handle, type, &ops);
1410         if (!result)
1411                 result = acpi_bus_scan(*child, &ops);
1412
1413         return result;
1414 }
1415
1416 EXPORT_SYMBOL(acpi_bus_add);
1417
1418 int acpi_bus_start(struct acpi_device *device)
1419 {
1420         int result;
1421         struct acpi_bus_ops ops;
1422
1423
1424         if (!device)
1425                 return -EINVAL;
1426
1427         result = acpi_start_single_object(device);
1428         if (!result) {
1429                 memset(&ops, 0, sizeof(ops));
1430                 ops.acpi_op_start = 1;
1431                 result = acpi_bus_scan(device, &ops);
1432         }
1433         return result;
1434 }
1435
1436 EXPORT_SYMBOL(acpi_bus_start);
1437
1438 int acpi_bus_trim(struct acpi_device *start, int rmdevice)
1439 {
1440         acpi_status status;
1441         struct acpi_device *parent, *child;
1442         acpi_handle phandle, chandle;
1443         acpi_object_type type;
1444         u32 level = 1;
1445         int err = 0;
1446
1447         parent = start;
1448         phandle = start->handle;
1449         child = chandle = NULL;
1450
1451         while ((level > 0) && parent && (!err)) {
1452                 status = acpi_get_next_object(ACPI_TYPE_ANY, phandle,
1453                                               chandle, &chandle);
1454
1455                 /*
1456                  * If this scope is exhausted then move our way back up.
1457                  */
1458                 if (ACPI_FAILURE(status)) {
1459                         level--;
1460                         chandle = phandle;
1461                         acpi_get_parent(phandle, &phandle);
1462                         child = parent;
1463                         parent = parent->parent;
1464
1465                         if (level == 0)
1466                                 err = acpi_bus_remove(child, rmdevice);
1467                         else
1468                                 err = acpi_bus_remove(child, 1);
1469
1470                         continue;
1471                 }
1472
1473                 status = acpi_get_type(chandle, &type);
1474                 if (ACPI_FAILURE(status)) {
1475                         continue;
1476                 }
1477                 /*
1478                  * If there is a device corresponding to chandle then
1479                  * parse it (depth-first).
1480                  */
1481                 if (acpi_bus_get_device(chandle, &child) == 0) {
1482                         level++;
1483                         phandle = chandle;
1484                         chandle = NULL;
1485                         parent = child;
1486                 }
1487                 continue;
1488         }
1489         return err;
1490 }
1491 EXPORT_SYMBOL_GPL(acpi_bus_trim);
1492
1493
1494 static int acpi_bus_scan_fixed(struct acpi_device *root)
1495 {
1496         int result = 0;
1497         struct acpi_device *device = NULL;
1498         struct acpi_bus_ops ops;
1499
1500         if (!root)
1501                 return -ENODEV;
1502
1503         memset(&ops, 0, sizeof(ops));
1504         ops.acpi_op_add = 1;
1505         ops.acpi_op_start = 1;
1506
1507         /*
1508          * Enumerate all fixed-feature devices.
1509          */
1510         if ((acpi_gbl_FADT.flags & ACPI_FADT_POWER_BUTTON) == 0) {
1511                 result = acpi_add_single_object(&device, acpi_root,
1512                                                 NULL,
1513                                                 ACPI_BUS_TYPE_POWER_BUTTON,
1514                                                 &ops);
1515         }
1516
1517         if ((acpi_gbl_FADT.flags & ACPI_FADT_SLEEP_BUTTON) == 0) {
1518                 result = acpi_add_single_object(&device, acpi_root,
1519                                                 NULL,
1520                                                 ACPI_BUS_TYPE_SLEEP_BUTTON,
1521                                                 &ops);
1522         }
1523
1524         return result;
1525 }
1526
1527
1528 static int __init acpi_scan_init(void)
1529 {
1530         int result;
1531         struct acpi_bus_ops ops;
1532
1533
1534         if (acpi_disabled)
1535                 return 0;
1536
1537         memset(&ops, 0, sizeof(ops));
1538         ops.acpi_op_add = 1;
1539         ops.acpi_op_start = 1;
1540
1541         result = bus_register(&acpi_bus_type);
1542         if (result) {
1543                 /* We don't want to quit even if we failed to add suspend/resume */
1544                 printk(KERN_ERR PREFIX "Could not register bus type\n");
1545         }
1546
1547         /*
1548          * Create the root device in the bus's device tree
1549          */
1550         result = acpi_add_single_object(&acpi_root, NULL, ACPI_ROOT_OBJECT,
1551                                         ACPI_BUS_TYPE_SYSTEM, &ops);
1552         if (result)
1553                 goto Done;
1554
1555         /*
1556          * Enumerate devices in the ACPI namespace.
1557          */
1558         result = acpi_bus_scan_fixed(acpi_root);
1559
1560         if (!result)
1561                 result = acpi_bus_scan(acpi_root, &ops);
1562
1563         if (result)
1564                 acpi_device_unregister(acpi_root, ACPI_BUS_REMOVAL_NORMAL);
1565
1566       Done:
1567         return result;
1568 }
1569
1570 subsys_initcall(acpi_scan_init);