Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/cmarinas...
[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/slab.h>
8 #include <linux/kernel.h>
9 #include <linux/acpi.h>
10 #include <linux/signal.h>
11 #include <linux/kthread.h>
12 #include <linux/dmi.h>
13
14 #include <acpi/acpi_drivers.h>
15
16 #include "internal.h"
17
18 #define _COMPONENT              ACPI_BUS_COMPONENT
19 ACPI_MODULE_NAME("scan");
20 #define STRUCT_TO_INT(s)        (*((int*)&s))
21 extern struct acpi_device *acpi_root;
22
23 #define ACPI_BUS_CLASS                  "system_bus"
24 #define ACPI_BUS_HID                    "LNXSYBUS"
25 #define ACPI_BUS_DEVICE_NAME            "System Bus"
26
27 #define ACPI_IS_ROOT_DEVICE(device)    (!(device)->parent)
28
29 static const char *dummy_hid = "device";
30
31 static LIST_HEAD(acpi_device_list);
32 static LIST_HEAD(acpi_bus_id_list);
33 DEFINE_MUTEX(acpi_device_lock);
34 LIST_HEAD(acpi_wakeup_device_list);
35
36 struct acpi_device_bus_id{
37         char bus_id[15];
38         unsigned int instance_no;
39         struct list_head node;
40 };
41
42 /*
43  * Creates hid/cid(s) string needed for modalias and uevent
44  * e.g. on a device with hid:IBM0001 and cid:ACPI0001 you get:
45  * char *modalias: "acpi:IBM0001:ACPI0001"
46 */
47 static int create_modalias(struct acpi_device *acpi_dev, char *modalias,
48                            int size)
49 {
50         int len;
51         int count;
52         struct acpi_hardware_id *id;
53
54         if (list_empty(&acpi_dev->pnp.ids))
55                 return 0;
56
57         len = snprintf(modalias, size, "acpi:");
58         size -= len;
59
60         list_for_each_entry(id, &acpi_dev->pnp.ids, list) {
61                 count = snprintf(&modalias[len], size, "%s:", id->id);
62                 if (count < 0 || count >= size)
63                         return -EINVAL;
64                 len += count;
65                 size -= count;
66         }
67
68         modalias[len] = '\0';
69         return len;
70 }
71
72 static ssize_t
73 acpi_device_modalias_show(struct device *dev, struct device_attribute *attr, char *buf) {
74         struct acpi_device *acpi_dev = to_acpi_device(dev);
75         int len;
76
77         /* Device has no HID and no CID or string is >1024 */
78         len = create_modalias(acpi_dev, buf, 1024);
79         if (len <= 0)
80                 return 0;
81         buf[len++] = '\n';
82         return len;
83 }
84 static DEVICE_ATTR(modalias, 0444, acpi_device_modalias_show, NULL);
85
86 static void acpi_bus_hot_remove_device(void *context)
87 {
88         struct acpi_device *device;
89         acpi_handle handle = context;
90         struct acpi_object_list arg_list;
91         union acpi_object arg;
92         acpi_status status = AE_OK;
93
94         if (acpi_bus_get_device(handle, &device))
95                 return;
96
97         if (!device)
98                 return;
99
100         ACPI_DEBUG_PRINT((ACPI_DB_INFO,
101                 "Hot-removing device %s...\n", dev_name(&device->dev)));
102
103         if (acpi_bus_trim(device, 1)) {
104                 printk(KERN_ERR PREFIX
105                                 "Removing device failed\n");
106                 return;
107         }
108
109         /* power off device */
110         status = acpi_evaluate_object(handle, "_PS3", NULL, NULL);
111         if (ACPI_FAILURE(status) && status != AE_NOT_FOUND)
112                 printk(KERN_WARNING PREFIX
113                                 "Power-off device failed\n");
114
115         if (device->flags.lockable) {
116                 arg_list.count = 1;
117                 arg_list.pointer = &arg;
118                 arg.type = ACPI_TYPE_INTEGER;
119                 arg.integer.value = 0;
120                 acpi_evaluate_object(handle, "_LCK", &arg_list, NULL);
121         }
122
123         arg_list.count = 1;
124         arg_list.pointer = &arg;
125         arg.type = ACPI_TYPE_INTEGER;
126         arg.integer.value = 1;
127
128         /*
129          * TBD: _EJD support.
130          */
131         status = acpi_evaluate_object(handle, "_EJ0", &arg_list, NULL);
132         if (ACPI_FAILURE(status))
133                 printk(KERN_WARNING PREFIX
134                                 "Eject device failed\n");
135
136         return;
137 }
138
139 static ssize_t
140 acpi_eject_store(struct device *d, struct device_attribute *attr,
141                 const char *buf, size_t count)
142 {
143         int ret = count;
144         acpi_status status;
145         acpi_object_type type = 0;
146         struct acpi_device *acpi_device = to_acpi_device(d);
147
148         if ((!count) || (buf[0] != '1')) {
149                 return -EINVAL;
150         }
151 #ifndef FORCE_EJECT
152         if (acpi_device->driver == NULL) {
153                 ret = -ENODEV;
154                 goto err;
155         }
156 #endif
157         status = acpi_get_type(acpi_device->handle, &type);
158         if (ACPI_FAILURE(status) || (!acpi_device->flags.ejectable)) {
159                 ret = -ENODEV;
160                 goto err;
161         }
162
163         acpi_os_hotplug_execute(acpi_bus_hot_remove_device, acpi_device->handle);
164 err:
165         return ret;
166 }
167
168 static DEVICE_ATTR(eject, 0200, NULL, acpi_eject_store);
169
170 static ssize_t
171 acpi_device_hid_show(struct device *dev, struct device_attribute *attr, char *buf) {
172         struct acpi_device *acpi_dev = to_acpi_device(dev);
173
174         return sprintf(buf, "%s\n", acpi_device_hid(acpi_dev));
175 }
176 static DEVICE_ATTR(hid, 0444, acpi_device_hid_show, NULL);
177
178 static ssize_t
179 acpi_device_path_show(struct device *dev, struct device_attribute *attr, char *buf) {
180         struct acpi_device *acpi_dev = to_acpi_device(dev);
181         struct acpi_buffer path = {ACPI_ALLOCATE_BUFFER, NULL};
182         int result;
183
184         result = acpi_get_name(acpi_dev->handle, ACPI_FULL_PATHNAME, &path);
185         if (result)
186                 goto end;
187
188         result = sprintf(buf, "%s\n", (char*)path.pointer);
189         kfree(path.pointer);
190 end:
191         return result;
192 }
193 static DEVICE_ATTR(path, 0444, acpi_device_path_show, NULL);
194
195 static int acpi_device_setup_files(struct acpi_device *dev)
196 {
197         acpi_status status;
198         acpi_handle temp;
199         int result = 0;
200
201         /*
202          * Devices gotten from FADT don't have a "path" attribute
203          */
204         if (dev->handle) {
205                 result = device_create_file(&dev->dev, &dev_attr_path);
206                 if (result)
207                         goto end;
208         }
209
210         if (!list_empty(&dev->pnp.ids)) {
211                 result = device_create_file(&dev->dev, &dev_attr_hid);
212                 if (result)
213                         goto end;
214
215                 result = device_create_file(&dev->dev, &dev_attr_modalias);
216                 if (result)
217                         goto end;
218         }
219
220         /*
221          * If device has _EJ0, 'eject' file is created that is used to trigger
222          * hot-removal function from userland.
223          */
224         status = acpi_get_handle(dev->handle, "_EJ0", &temp);
225         if (ACPI_SUCCESS(status))
226                 result = device_create_file(&dev->dev, &dev_attr_eject);
227 end:
228         return result;
229 }
230
231 static void acpi_device_remove_files(struct acpi_device *dev)
232 {
233         acpi_status status;
234         acpi_handle temp;
235
236         /*
237          * If device has _EJ0, 'eject' file is created that is used to trigger
238          * hot-removal function from userland.
239          */
240         status = acpi_get_handle(dev->handle, "_EJ0", &temp);
241         if (ACPI_SUCCESS(status))
242                 device_remove_file(&dev->dev, &dev_attr_eject);
243
244         device_remove_file(&dev->dev, &dev_attr_modalias);
245         device_remove_file(&dev->dev, &dev_attr_hid);
246         if (dev->handle)
247                 device_remove_file(&dev->dev, &dev_attr_path);
248 }
249 /* --------------------------------------------------------------------------
250                         ACPI Bus operations
251    -------------------------------------------------------------------------- */
252
253 int acpi_match_device_ids(struct acpi_device *device,
254                           const struct acpi_device_id *ids)
255 {
256         const struct acpi_device_id *id;
257         struct acpi_hardware_id *hwid;
258
259         /*
260          * If the device is not present, it is unnecessary to load device
261          * driver for it.
262          */
263         if (!device->status.present)
264                 return -ENODEV;
265
266         for (id = ids; id->id[0]; id++)
267                 list_for_each_entry(hwid, &device->pnp.ids, list)
268                         if (!strcmp((char *) id->id, hwid->id))
269                                 return 0;
270
271         return -ENOENT;
272 }
273 EXPORT_SYMBOL(acpi_match_device_ids);
274
275 static void acpi_free_ids(struct acpi_device *device)
276 {
277         struct acpi_hardware_id *id, *tmp;
278
279         list_for_each_entry_safe(id, tmp, &device->pnp.ids, list) {
280                 kfree(id->id);
281                 kfree(id);
282         }
283 }
284
285 static void acpi_device_release(struct device *dev)
286 {
287         struct acpi_device *acpi_dev = to_acpi_device(dev);
288
289         acpi_free_ids(acpi_dev);
290         kfree(acpi_dev);
291 }
292
293 static int acpi_device_suspend(struct device *dev, pm_message_t state)
294 {
295         struct acpi_device *acpi_dev = to_acpi_device(dev);
296         struct acpi_driver *acpi_drv = acpi_dev->driver;
297
298         if (acpi_drv && acpi_drv->ops.suspend)
299                 return acpi_drv->ops.suspend(acpi_dev, state);
300         return 0;
301 }
302
303 static int acpi_device_resume(struct device *dev)
304 {
305         struct acpi_device *acpi_dev = to_acpi_device(dev);
306         struct acpi_driver *acpi_drv = acpi_dev->driver;
307
308         if (acpi_drv && acpi_drv->ops.resume)
309                 return acpi_drv->ops.resume(acpi_dev);
310         return 0;
311 }
312
313 static int acpi_bus_match(struct device *dev, struct device_driver *drv)
314 {
315         struct acpi_device *acpi_dev = to_acpi_device(dev);
316         struct acpi_driver *acpi_drv = to_acpi_driver(drv);
317
318         return !acpi_match_device_ids(acpi_dev, acpi_drv->ids);
319 }
320
321 static int acpi_device_uevent(struct device *dev, struct kobj_uevent_env *env)
322 {
323         struct acpi_device *acpi_dev = to_acpi_device(dev);
324         int len;
325
326         if (list_empty(&acpi_dev->pnp.ids))
327                 return 0;
328
329         if (add_uevent_var(env, "MODALIAS="))
330                 return -ENOMEM;
331         len = create_modalias(acpi_dev, &env->buf[env->buflen - 1],
332                               sizeof(env->buf) - env->buflen);
333         if (len >= (sizeof(env->buf) - env->buflen))
334                 return -ENOMEM;
335         env->buflen += len;
336         return 0;
337 }
338
339 static void acpi_device_notify(acpi_handle handle, u32 event, void *data)
340 {
341         struct acpi_device *device = data;
342
343         device->driver->ops.notify(device, event);
344 }
345
346 static acpi_status acpi_device_notify_fixed(void *data)
347 {
348         struct acpi_device *device = data;
349
350         /* Fixed hardware devices have no handles */
351         acpi_device_notify(NULL, ACPI_FIXED_HARDWARE_EVENT, device);
352         return AE_OK;
353 }
354
355 static int acpi_device_install_notify_handler(struct acpi_device *device)
356 {
357         acpi_status status;
358
359         if (device->device_type == ACPI_BUS_TYPE_POWER_BUTTON)
360                 status =
361                     acpi_install_fixed_event_handler(ACPI_EVENT_POWER_BUTTON,
362                                                      acpi_device_notify_fixed,
363                                                      device);
364         else if (device->device_type == ACPI_BUS_TYPE_SLEEP_BUTTON)
365                 status =
366                     acpi_install_fixed_event_handler(ACPI_EVENT_SLEEP_BUTTON,
367                                                      acpi_device_notify_fixed,
368                                                      device);
369         else
370                 status = acpi_install_notify_handler(device->handle,
371                                                      ACPI_DEVICE_NOTIFY,
372                                                      acpi_device_notify,
373                                                      device);
374
375         if (ACPI_FAILURE(status))
376                 return -EINVAL;
377         return 0;
378 }
379
380 static void acpi_device_remove_notify_handler(struct acpi_device *device)
381 {
382         if (device->device_type == ACPI_BUS_TYPE_POWER_BUTTON)
383                 acpi_remove_fixed_event_handler(ACPI_EVENT_POWER_BUTTON,
384                                                 acpi_device_notify_fixed);
385         else if (device->device_type == ACPI_BUS_TYPE_SLEEP_BUTTON)
386                 acpi_remove_fixed_event_handler(ACPI_EVENT_SLEEP_BUTTON,
387                                                 acpi_device_notify_fixed);
388         else
389                 acpi_remove_notify_handler(device->handle, ACPI_DEVICE_NOTIFY,
390                                            acpi_device_notify);
391 }
392
393 static int acpi_bus_driver_init(struct acpi_device *, struct acpi_driver *);
394 static int acpi_start_single_object(struct acpi_device *);
395 static int acpi_device_probe(struct device * dev)
396 {
397         struct acpi_device *acpi_dev = to_acpi_device(dev);
398         struct acpi_driver *acpi_drv = to_acpi_driver(dev->driver);
399         int ret;
400
401         ret = acpi_bus_driver_init(acpi_dev, acpi_drv);
402         if (!ret) {
403                 if (acpi_dev->bus_ops.acpi_op_start)
404                         acpi_start_single_object(acpi_dev);
405
406                 if (acpi_drv->ops.notify) {
407                         ret = acpi_device_install_notify_handler(acpi_dev);
408                         if (ret) {
409                                 if (acpi_drv->ops.remove)
410                                         acpi_drv->ops.remove(acpi_dev,
411                                                      acpi_dev->removal_type);
412                                 return ret;
413                         }
414                 }
415
416                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
417                         "Found driver [%s] for device [%s]\n",
418                         acpi_drv->name, acpi_dev->pnp.bus_id));
419                 get_device(dev);
420         }
421         return ret;
422 }
423
424 static int acpi_device_remove(struct device * dev)
425 {
426         struct acpi_device *acpi_dev = to_acpi_device(dev);
427         struct acpi_driver *acpi_drv = acpi_dev->driver;
428
429         if (acpi_drv) {
430                 if (acpi_drv->ops.notify)
431                         acpi_device_remove_notify_handler(acpi_dev);
432                 if (acpi_drv->ops.remove)
433                         acpi_drv->ops.remove(acpi_dev, acpi_dev->removal_type);
434         }
435         acpi_dev->driver = NULL;
436         acpi_dev->driver_data = NULL;
437
438         put_device(dev);
439         return 0;
440 }
441
442 struct bus_type acpi_bus_type = {
443         .name           = "acpi",
444         .suspend        = acpi_device_suspend,
445         .resume         = acpi_device_resume,
446         .match          = acpi_bus_match,
447         .probe          = acpi_device_probe,
448         .remove         = acpi_device_remove,
449         .uevent         = acpi_device_uevent,
450 };
451
452 static int acpi_device_register(struct acpi_device *device)
453 {
454         int result;
455         struct acpi_device_bus_id *acpi_device_bus_id, *new_bus_id;
456         int found = 0;
457
458         /*
459          * Linkage
460          * -------
461          * Link this device to its parent and siblings.
462          */
463         INIT_LIST_HEAD(&device->children);
464         INIT_LIST_HEAD(&device->node);
465         INIT_LIST_HEAD(&device->wakeup_list);
466
467         new_bus_id = kzalloc(sizeof(struct acpi_device_bus_id), GFP_KERNEL);
468         if (!new_bus_id) {
469                 printk(KERN_ERR PREFIX "Memory allocation error\n");
470                 return -ENOMEM;
471         }
472
473         mutex_lock(&acpi_device_lock);
474         /*
475          * Find suitable bus_id and instance number in acpi_bus_id_list
476          * If failed, create one and link it into acpi_bus_id_list
477          */
478         list_for_each_entry(acpi_device_bus_id, &acpi_bus_id_list, node) {
479                 if (!strcmp(acpi_device_bus_id->bus_id,
480                             acpi_device_hid(device))) {
481                         acpi_device_bus_id->instance_no++;
482                         found = 1;
483                         kfree(new_bus_id);
484                         break;
485                 }
486         }
487         if (!found) {
488                 acpi_device_bus_id = new_bus_id;
489                 strcpy(acpi_device_bus_id->bus_id, acpi_device_hid(device));
490                 acpi_device_bus_id->instance_no = 0;
491                 list_add_tail(&acpi_device_bus_id->node, &acpi_bus_id_list);
492         }
493         dev_set_name(&device->dev, "%s:%02x", acpi_device_bus_id->bus_id, acpi_device_bus_id->instance_no);
494
495         if (device->parent)
496                 list_add_tail(&device->node, &device->parent->children);
497
498         if (device->wakeup.flags.valid)
499                 list_add_tail(&device->wakeup_list, &acpi_wakeup_device_list);
500         mutex_unlock(&acpi_device_lock);
501
502         if (device->parent)
503                 device->dev.parent = &device->parent->dev;
504         device->dev.bus = &acpi_bus_type;
505         device->dev.release = &acpi_device_release;
506         result = device_register(&device->dev);
507         if (result) {
508                 dev_err(&device->dev, "Error registering device\n");
509                 goto end;
510         }
511
512         result = acpi_device_setup_files(device);
513         if (result)
514                 printk(KERN_ERR PREFIX "Error creating sysfs interface for device %s\n",
515                        dev_name(&device->dev));
516
517         device->removal_type = ACPI_BUS_REMOVAL_NORMAL;
518         return 0;
519 end:
520         mutex_lock(&acpi_device_lock);
521         if (device->parent)
522                 list_del(&device->node);
523         list_del(&device->wakeup_list);
524         mutex_unlock(&acpi_device_lock);
525         return result;
526 }
527
528 static void acpi_device_unregister(struct acpi_device *device, int type)
529 {
530         mutex_lock(&acpi_device_lock);
531         if (device->parent)
532                 list_del(&device->node);
533
534         list_del(&device->wakeup_list);
535         mutex_unlock(&acpi_device_lock);
536
537         acpi_detach_data(device->handle, acpi_bus_data_handler);
538
539         acpi_device_remove_files(device);
540         device_unregister(&device->dev);
541 }
542
543 /* --------------------------------------------------------------------------
544                                  Driver Management
545    -------------------------------------------------------------------------- */
546 /**
547  * acpi_bus_driver_init - add a device to a driver
548  * @device: the device to add and initialize
549  * @driver: driver for the device
550  *
551  * Used to initialize a device via its device driver.  Called whenever a
552  * driver is bound to a device.  Invokes the driver's add() ops.
553  */
554 static int
555 acpi_bus_driver_init(struct acpi_device *device, struct acpi_driver *driver)
556 {
557         int result = 0;
558
559         if (!device || !driver)
560                 return -EINVAL;
561
562         if (!driver->ops.add)
563                 return -ENOSYS;
564
565         result = driver->ops.add(device);
566         if (result) {
567                 device->driver = NULL;
568                 device->driver_data = NULL;
569                 return result;
570         }
571
572         device->driver = driver;
573
574         /*
575          * TBD - Configuration Management: Assign resources to device based
576          * upon possible configuration and currently allocated resources.
577          */
578
579         ACPI_DEBUG_PRINT((ACPI_DB_INFO,
580                           "Driver successfully bound to device\n"));
581         return 0;
582 }
583
584 static int acpi_start_single_object(struct acpi_device *device)
585 {
586         int result = 0;
587         struct acpi_driver *driver;
588
589
590         if (!(driver = device->driver))
591                 return 0;
592
593         if (driver->ops.start) {
594                 result = driver->ops.start(device);
595                 if (result && driver->ops.remove)
596                         driver->ops.remove(device, ACPI_BUS_REMOVAL_NORMAL);
597         }
598
599         return result;
600 }
601
602 /**
603  * acpi_bus_register_driver - register a driver with the ACPI bus
604  * @driver: driver being registered
605  *
606  * Registers a driver with the ACPI bus.  Searches the namespace for all
607  * devices that match the driver's criteria and binds.  Returns zero for
608  * success or a negative error status for failure.
609  */
610 int acpi_bus_register_driver(struct acpi_driver *driver)
611 {
612         int ret;
613
614         if (acpi_disabled)
615                 return -ENODEV;
616         driver->drv.name = driver->name;
617         driver->drv.bus = &acpi_bus_type;
618         driver->drv.owner = driver->owner;
619
620         ret = driver_register(&driver->drv);
621         return ret;
622 }
623
624 EXPORT_SYMBOL(acpi_bus_register_driver);
625
626 /**
627  * acpi_bus_unregister_driver - unregisters a driver with the APIC bus
628  * @driver: driver to unregister
629  *
630  * Unregisters a driver with the ACPI bus.  Searches the namespace for all
631  * devices that match the driver's criteria and unbinds.
632  */
633 void acpi_bus_unregister_driver(struct acpi_driver *driver)
634 {
635         driver_unregister(&driver->drv);
636 }
637
638 EXPORT_SYMBOL(acpi_bus_unregister_driver);
639
640 /* --------------------------------------------------------------------------
641                                  Device Enumeration
642    -------------------------------------------------------------------------- */
643 static struct acpi_device *acpi_bus_get_parent(acpi_handle handle)
644 {
645         acpi_status status;
646         int ret;
647         struct acpi_device *device;
648
649         /*
650          * Fixed hardware devices do not appear in the namespace and do not
651          * have handles, but we fabricate acpi_devices for them, so we have
652          * to deal with them specially.
653          */
654         if (handle == NULL)
655                 return acpi_root;
656
657         do {
658                 status = acpi_get_parent(handle, &handle);
659                 if (status == AE_NULL_ENTRY)
660                         return NULL;
661                 if (ACPI_FAILURE(status))
662                         return acpi_root;
663
664                 ret = acpi_bus_get_device(handle, &device);
665                 if (ret == 0)
666                         return device;
667         } while (1);
668 }
669
670 acpi_status
671 acpi_bus_get_ejd(acpi_handle handle, acpi_handle *ejd)
672 {
673         acpi_status status;
674         acpi_handle tmp;
675         struct acpi_buffer buffer = {ACPI_ALLOCATE_BUFFER, NULL};
676         union acpi_object *obj;
677
678         status = acpi_get_handle(handle, "_EJD", &tmp);
679         if (ACPI_FAILURE(status))
680                 return status;
681
682         status = acpi_evaluate_object(handle, "_EJD", NULL, &buffer);
683         if (ACPI_SUCCESS(status)) {
684                 obj = buffer.pointer;
685                 status = acpi_get_handle(ACPI_ROOT_OBJECT, obj->string.pointer,
686                                          ejd);
687                 kfree(buffer.pointer);
688         }
689         return status;
690 }
691 EXPORT_SYMBOL_GPL(acpi_bus_get_ejd);
692
693 void acpi_bus_data_handler(acpi_handle handle, void *context)
694 {
695
696         /* TBD */
697
698         return;
699 }
700
701 static int acpi_bus_get_perf_flags(struct acpi_device *device)
702 {
703         device->performance.state = ACPI_STATE_UNKNOWN;
704         return 0;
705 }
706
707 static acpi_status
708 acpi_bus_extract_wakeup_device_power_package(acpi_handle handle,
709                                              struct acpi_device_wakeup *wakeup)
710 {
711         struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
712         union acpi_object *package = NULL;
713         union acpi_object *element = NULL;
714         acpi_status status;
715         int i = 0;
716
717         if (!wakeup)
718                 return AE_BAD_PARAMETER;
719
720         /* _PRW */
721         status = acpi_evaluate_object(handle, "_PRW", NULL, &buffer);
722         if (ACPI_FAILURE(status)) {
723                 ACPI_EXCEPTION((AE_INFO, status, "Evaluating _PRW"));
724                 return status;
725         }
726
727         package = (union acpi_object *)buffer.pointer;
728
729         if (!package || (package->package.count < 2)) {
730                 status = AE_BAD_DATA;
731                 goto out;
732         }
733
734         element = &(package->package.elements[0]);
735         if (!element) {
736                 status = AE_BAD_DATA;
737                 goto out;
738         }
739         if (element->type == ACPI_TYPE_PACKAGE) {
740                 if ((element->package.count < 2) ||
741                     (element->package.elements[0].type !=
742                      ACPI_TYPE_LOCAL_REFERENCE)
743                     || (element->package.elements[1].type != ACPI_TYPE_INTEGER)) {
744                         status = AE_BAD_DATA;
745                         goto out;
746                 }
747                 wakeup->gpe_device =
748                     element->package.elements[0].reference.handle;
749                 wakeup->gpe_number =
750                     (u32) element->package.elements[1].integer.value;
751         } else if (element->type == ACPI_TYPE_INTEGER) {
752                 wakeup->gpe_device = NULL;
753                 wakeup->gpe_number = element->integer.value;
754         } else {
755                 status = AE_BAD_DATA;
756                 goto out;
757         }
758
759         element = &(package->package.elements[1]);
760         if (element->type != ACPI_TYPE_INTEGER) {
761                 status = AE_BAD_DATA;
762                 goto out;
763         }
764         wakeup->sleep_state = element->integer.value;
765
766         if ((package->package.count - 2) > ACPI_MAX_HANDLES) {
767                 status = AE_NO_MEMORY;
768                 goto out;
769         }
770         wakeup->resources.count = package->package.count - 2;
771         for (i = 0; i < wakeup->resources.count; i++) {
772                 element = &(package->package.elements[i + 2]);
773                 if (element->type != ACPI_TYPE_LOCAL_REFERENCE) {
774                         status = AE_BAD_DATA;
775                         goto out;
776                 }
777
778                 wakeup->resources.handles[i] = element->reference.handle;
779         }
780
781         acpi_setup_gpe_for_wake(handle, wakeup->gpe_device, wakeup->gpe_number);
782
783  out:
784         kfree(buffer.pointer);
785
786         return status;
787 }
788
789 static void acpi_bus_set_run_wake_flags(struct acpi_device *device)
790 {
791         struct acpi_device_id button_device_ids[] = {
792                 {"PNP0C0D", 0},
793                 {"PNP0C0C", 0},
794                 {"PNP0C0E", 0},
795                 {"", 0},
796         };
797         acpi_status status;
798         acpi_event_status event_status;
799
800         device->wakeup.flags.notifier_present = 0;
801
802         /* Power button, Lid switch always enable wakeup */
803         if (!acpi_match_device_ids(device, button_device_ids)) {
804                 device->wakeup.flags.run_wake = 1;
805                 device_set_wakeup_capable(&device->dev, true);
806                 return;
807         }
808
809         status = acpi_get_gpe_status(device->wakeup.gpe_device,
810                                         device->wakeup.gpe_number,
811                                                 &event_status);
812         if (status == AE_OK)
813                 device->wakeup.flags.run_wake =
814                                 !!(event_status & ACPI_EVENT_FLAG_HANDLE);
815 }
816
817 static void acpi_bus_get_wakeup_device_flags(struct acpi_device *device)
818 {
819         acpi_handle temp;
820         acpi_status status = 0;
821         int psw_error;
822
823         /* Presence of _PRW indicates wake capable */
824         status = acpi_get_handle(device->handle, "_PRW", &temp);
825         if (ACPI_FAILURE(status))
826                 return;
827
828         status = acpi_bus_extract_wakeup_device_power_package(device->handle,
829                                                               &device->wakeup);
830         if (ACPI_FAILURE(status)) {
831                 ACPI_EXCEPTION((AE_INFO, status, "Extracting _PRW package"));
832                 return;
833         }
834
835         device->wakeup.flags.valid = 1;
836         device->wakeup.prepare_count = 0;
837         acpi_bus_set_run_wake_flags(device);
838         /* Call _PSW/_DSW object to disable its ability to wake the sleeping
839          * system for the ACPI device with the _PRW object.
840          * The _PSW object is depreciated in ACPI 3.0 and is replaced by _DSW.
841          * So it is necessary to call _DSW object first. Only when it is not
842          * present will the _PSW object used.
843          */
844         psw_error = acpi_device_sleep_wake(device, 0, 0, 0);
845         if (psw_error)
846                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
847                                 "error in _DSW or _PSW evaluation\n"));
848 }
849
850 static void acpi_bus_add_power_resource(acpi_handle handle);
851
852 static int acpi_bus_get_power_flags(struct acpi_device *device)
853 {
854         acpi_status status = 0;
855         acpi_handle handle = NULL;
856         u32 i = 0;
857
858
859         /*
860          * Power Management Flags
861          */
862         status = acpi_get_handle(device->handle, "_PSC", &handle);
863         if (ACPI_SUCCESS(status))
864                 device->power.flags.explicit_get = 1;
865         status = acpi_get_handle(device->handle, "_IRC", &handle);
866         if (ACPI_SUCCESS(status))
867                 device->power.flags.inrush_current = 1;
868
869         /*
870          * Enumerate supported power management states
871          */
872         for (i = ACPI_STATE_D0; i <= ACPI_STATE_D3; i++) {
873                 struct acpi_device_power_state *ps = &device->power.states[i];
874                 char object_name[5] = { '_', 'P', 'R', '0' + i, '\0' };
875
876                 /* Evaluate "_PRx" to se if power resources are referenced */
877                 acpi_evaluate_reference(device->handle, object_name, NULL,
878                                         &ps->resources);
879                 if (ps->resources.count) {
880                         int j;
881
882                         device->power.flags.power_resources = 1;
883                         ps->flags.valid = 1;
884                         for (j = 0; j < ps->resources.count; j++)
885                                 acpi_bus_add_power_resource(ps->resources.handles[j]);
886                 }
887
888                 /* Evaluate "_PSx" to see if we can do explicit sets */
889                 object_name[2] = 'S';
890                 status = acpi_get_handle(device->handle, object_name, &handle);
891                 if (ACPI_SUCCESS(status)) {
892                         ps->flags.explicit_set = 1;
893                         ps->flags.valid = 1;
894                 }
895
896                 /* State is valid if we have some power control */
897                 if (ps->resources.count || ps->flags.explicit_set)
898                         ps->flags.valid = 1;
899
900                 ps->power = -1; /* Unknown - driver assigned */
901                 ps->latency = -1;       /* Unknown - driver assigned */
902         }
903
904         /* Set defaults for D0 and D3 states (always valid) */
905         device->power.states[ACPI_STATE_D0].flags.valid = 1;
906         device->power.states[ACPI_STATE_D0].power = 100;
907         device->power.states[ACPI_STATE_D3].flags.valid = 1;
908         device->power.states[ACPI_STATE_D3].power = 0;
909
910         acpi_bus_init_power(device);
911
912         return 0;
913 }
914
915 static int acpi_bus_get_flags(struct acpi_device *device)
916 {
917         acpi_status status = AE_OK;
918         acpi_handle temp = NULL;
919
920
921         /* Presence of _STA indicates 'dynamic_status' */
922         status = acpi_get_handle(device->handle, "_STA", &temp);
923         if (ACPI_SUCCESS(status))
924                 device->flags.dynamic_status = 1;
925
926         /* Presence of _RMV indicates 'removable' */
927         status = acpi_get_handle(device->handle, "_RMV", &temp);
928         if (ACPI_SUCCESS(status))
929                 device->flags.removable = 1;
930
931         /* Presence of _EJD|_EJ0 indicates 'ejectable' */
932         status = acpi_get_handle(device->handle, "_EJD", &temp);
933         if (ACPI_SUCCESS(status))
934                 device->flags.ejectable = 1;
935         else {
936                 status = acpi_get_handle(device->handle, "_EJ0", &temp);
937                 if (ACPI_SUCCESS(status))
938                         device->flags.ejectable = 1;
939         }
940
941         /* Presence of _LCK indicates 'lockable' */
942         status = acpi_get_handle(device->handle, "_LCK", &temp);
943         if (ACPI_SUCCESS(status))
944                 device->flags.lockable = 1;
945
946         /* Power resources cannot be power manageable. */
947         if (device->device_type == ACPI_BUS_TYPE_POWER)
948                 return 0;
949
950         /* Presence of _PS0|_PR0 indicates 'power manageable' */
951         status = acpi_get_handle(device->handle, "_PS0", &temp);
952         if (ACPI_FAILURE(status))
953                 status = acpi_get_handle(device->handle, "_PR0", &temp);
954         if (ACPI_SUCCESS(status))
955                 device->flags.power_manageable = 1;
956
957         /* TBD: Performance management */
958
959         return 0;
960 }
961
962 static void acpi_device_get_busid(struct acpi_device *device)
963 {
964         char bus_id[5] = { '?', 0 };
965         struct acpi_buffer buffer = { sizeof(bus_id), bus_id };
966         int i = 0;
967
968         /*
969          * Bus ID
970          * ------
971          * The device's Bus ID is simply the object name.
972          * TBD: Shouldn't this value be unique (within the ACPI namespace)?
973          */
974         if (ACPI_IS_ROOT_DEVICE(device)) {
975                 strcpy(device->pnp.bus_id, "ACPI");
976                 return;
977         }
978
979         switch (device->device_type) {
980         case ACPI_BUS_TYPE_POWER_BUTTON:
981                 strcpy(device->pnp.bus_id, "PWRF");
982                 break;
983         case ACPI_BUS_TYPE_SLEEP_BUTTON:
984                 strcpy(device->pnp.bus_id, "SLPF");
985                 break;
986         default:
987                 acpi_get_name(device->handle, ACPI_SINGLE_NAME, &buffer);
988                 /* Clean up trailing underscores (if any) */
989                 for (i = 3; i > 1; i--) {
990                         if (bus_id[i] == '_')
991                                 bus_id[i] = '\0';
992                         else
993                                 break;
994                 }
995                 strcpy(device->pnp.bus_id, bus_id);
996                 break;
997         }
998 }
999
1000 /*
1001  * acpi_bay_match - see if a device is an ejectable driver bay
1002  *
1003  * If an acpi object is ejectable and has one of the ACPI ATA methods defined,
1004  * then we can safely call it an ejectable drive bay
1005  */
1006 static int acpi_bay_match(struct acpi_device *device){
1007         acpi_status status;
1008         acpi_handle handle;
1009         acpi_handle tmp;
1010         acpi_handle phandle;
1011
1012         handle = device->handle;
1013
1014         status = acpi_get_handle(handle, "_EJ0", &tmp);
1015         if (ACPI_FAILURE(status))
1016                 return -ENODEV;
1017
1018         if ((ACPI_SUCCESS(acpi_get_handle(handle, "_GTF", &tmp))) ||
1019                 (ACPI_SUCCESS(acpi_get_handle(handle, "_GTM", &tmp))) ||
1020                 (ACPI_SUCCESS(acpi_get_handle(handle, "_STM", &tmp))) ||
1021                 (ACPI_SUCCESS(acpi_get_handle(handle, "_SDD", &tmp))))
1022                 return 0;
1023
1024         if (acpi_get_parent(handle, &phandle))
1025                 return -ENODEV;
1026
1027         if ((ACPI_SUCCESS(acpi_get_handle(phandle, "_GTF", &tmp))) ||
1028                 (ACPI_SUCCESS(acpi_get_handle(phandle, "_GTM", &tmp))) ||
1029                 (ACPI_SUCCESS(acpi_get_handle(phandle, "_STM", &tmp))) ||
1030                 (ACPI_SUCCESS(acpi_get_handle(phandle, "_SDD", &tmp))))
1031                 return 0;
1032
1033         return -ENODEV;
1034 }
1035
1036 /*
1037  * acpi_dock_match - see if a device has a _DCK method
1038  */
1039 static int acpi_dock_match(struct acpi_device *device)
1040 {
1041         acpi_handle tmp;
1042         return acpi_get_handle(device->handle, "_DCK", &tmp);
1043 }
1044
1045 const char *acpi_device_hid(struct acpi_device *device)
1046 {
1047         struct acpi_hardware_id *hid;
1048
1049         if (list_empty(&device->pnp.ids))
1050                 return dummy_hid;
1051
1052         hid = list_first_entry(&device->pnp.ids, struct acpi_hardware_id, list);
1053         return hid->id;
1054 }
1055 EXPORT_SYMBOL(acpi_device_hid);
1056
1057 static void acpi_add_id(struct acpi_device *device, const char *dev_id)
1058 {
1059         struct acpi_hardware_id *id;
1060
1061         id = kmalloc(sizeof(*id), GFP_KERNEL);
1062         if (!id)
1063                 return;
1064
1065         id->id = kmalloc(strlen(dev_id) + 1, GFP_KERNEL);
1066         if (!id->id) {
1067                 kfree(id);
1068                 return;
1069         }
1070
1071         strcpy(id->id, dev_id);
1072         list_add_tail(&id->list, &device->pnp.ids);
1073 }
1074
1075 /*
1076  * Old IBM workstations have a DSDT bug wherein the SMBus object
1077  * lacks the SMBUS01 HID and the methods do not have the necessary "_"
1078  * prefix.  Work around this.
1079  */
1080 static int acpi_ibm_smbus_match(struct acpi_device *device)
1081 {
1082         acpi_handle h_dummy;
1083         struct acpi_buffer path = {ACPI_ALLOCATE_BUFFER, NULL};
1084         int result;
1085
1086         if (!dmi_name_in_vendors("IBM"))
1087                 return -ENODEV;
1088
1089         /* Look for SMBS object */
1090         result = acpi_get_name(device->handle, ACPI_SINGLE_NAME, &path);
1091         if (result)
1092                 return result;
1093
1094         if (strcmp("SMBS", path.pointer)) {
1095                 result = -ENODEV;
1096                 goto out;
1097         }
1098
1099         /* Does it have the necessary (but misnamed) methods? */
1100         result = -ENODEV;
1101         if (ACPI_SUCCESS(acpi_get_handle(device->handle, "SBI", &h_dummy)) &&
1102             ACPI_SUCCESS(acpi_get_handle(device->handle, "SBR", &h_dummy)) &&
1103             ACPI_SUCCESS(acpi_get_handle(device->handle, "SBW", &h_dummy)))
1104                 result = 0;
1105 out:
1106         kfree(path.pointer);
1107         return result;
1108 }
1109
1110 static void acpi_device_set_id(struct acpi_device *device)
1111 {
1112         acpi_status status;
1113         struct acpi_device_info *info;
1114         struct acpica_device_id_list *cid_list;
1115         int i;
1116
1117         switch (device->device_type) {
1118         case ACPI_BUS_TYPE_DEVICE:
1119                 if (ACPI_IS_ROOT_DEVICE(device)) {
1120                         acpi_add_id(device, ACPI_SYSTEM_HID);
1121                         break;
1122                 }
1123
1124                 status = acpi_get_object_info(device->handle, &info);
1125                 if (ACPI_FAILURE(status)) {
1126                         printk(KERN_ERR PREFIX "%s: Error reading device info\n", __func__);
1127                         return;
1128                 }
1129
1130                 if (info->valid & ACPI_VALID_HID)
1131                         acpi_add_id(device, info->hardware_id.string);
1132                 if (info->valid & ACPI_VALID_CID) {
1133                         cid_list = &info->compatible_id_list;
1134                         for (i = 0; i < cid_list->count; i++)
1135                                 acpi_add_id(device, cid_list->ids[i].string);
1136                 }
1137                 if (info->valid & ACPI_VALID_ADR) {
1138                         device->pnp.bus_address = info->address;
1139                         device->flags.bus_address = 1;
1140                 }
1141
1142                 kfree(info);
1143
1144                 /*
1145                  * Some devices don't reliably have _HIDs & _CIDs, so add
1146                  * synthetic HIDs to make sure drivers can find them.
1147                  */
1148                 if (acpi_is_video_device(device))
1149                         acpi_add_id(device, ACPI_VIDEO_HID);
1150                 else if (ACPI_SUCCESS(acpi_bay_match(device)))
1151                         acpi_add_id(device, ACPI_BAY_HID);
1152                 else if (ACPI_SUCCESS(acpi_dock_match(device)))
1153                         acpi_add_id(device, ACPI_DOCK_HID);
1154                 else if (!acpi_ibm_smbus_match(device))
1155                         acpi_add_id(device, ACPI_SMBUS_IBM_HID);
1156                 else if (!acpi_device_hid(device) &&
1157                          ACPI_IS_ROOT_DEVICE(device->parent)) {
1158                         acpi_add_id(device, ACPI_BUS_HID); /* \_SB, LNXSYBUS */
1159                         strcpy(device->pnp.device_name, ACPI_BUS_DEVICE_NAME);
1160                         strcpy(device->pnp.device_class, ACPI_BUS_CLASS);
1161                 }
1162
1163                 break;
1164         case ACPI_BUS_TYPE_POWER:
1165                 acpi_add_id(device, ACPI_POWER_HID);
1166                 break;
1167         case ACPI_BUS_TYPE_PROCESSOR:
1168                 acpi_add_id(device, ACPI_PROCESSOR_OBJECT_HID);
1169                 break;
1170         case ACPI_BUS_TYPE_THERMAL:
1171                 acpi_add_id(device, ACPI_THERMAL_HID);
1172                 break;
1173         case ACPI_BUS_TYPE_POWER_BUTTON:
1174                 acpi_add_id(device, ACPI_BUTTON_HID_POWERF);
1175                 break;
1176         case ACPI_BUS_TYPE_SLEEP_BUTTON:
1177                 acpi_add_id(device, ACPI_BUTTON_HID_SLEEPF);
1178                 break;
1179         }
1180 }
1181
1182 static int acpi_device_set_context(struct acpi_device *device)
1183 {
1184         acpi_status status;
1185
1186         /*
1187          * Context
1188          * -------
1189          * Attach this 'struct acpi_device' to the ACPI object.  This makes
1190          * resolutions from handle->device very efficient.  Fixed hardware
1191          * devices have no handles, so we skip them.
1192          */
1193         if (!device->handle)
1194                 return 0;
1195
1196         status = acpi_attach_data(device->handle,
1197                                   acpi_bus_data_handler, device);
1198         if (ACPI_SUCCESS(status))
1199                 return 0;
1200
1201         printk(KERN_ERR PREFIX "Error attaching device data\n");
1202         return -ENODEV;
1203 }
1204
1205 static int acpi_bus_remove(struct acpi_device *dev, int rmdevice)
1206 {
1207         if (!dev)
1208                 return -EINVAL;
1209
1210         dev->removal_type = ACPI_BUS_REMOVAL_EJECT;
1211         device_release_driver(&dev->dev);
1212
1213         if (!rmdevice)
1214                 return 0;
1215
1216         /*
1217          * unbind _ADR-Based Devices when hot removal
1218          */
1219         if (dev->flags.bus_address) {
1220                 if ((dev->parent) && (dev->parent->ops.unbind))
1221                         dev->parent->ops.unbind(dev);
1222         }
1223         acpi_device_unregister(dev, ACPI_BUS_REMOVAL_EJECT);
1224
1225         return 0;
1226 }
1227
1228 static int acpi_add_single_object(struct acpi_device **child,
1229                                   acpi_handle handle, int type,
1230                                   unsigned long long sta,
1231                                   struct acpi_bus_ops *ops)
1232 {
1233         int result;
1234         struct acpi_device *device;
1235         struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
1236
1237         device = kzalloc(sizeof(struct acpi_device), GFP_KERNEL);
1238         if (!device) {
1239                 printk(KERN_ERR PREFIX "Memory allocation error\n");
1240                 return -ENOMEM;
1241         }
1242
1243         INIT_LIST_HEAD(&device->pnp.ids);
1244         device->device_type = type;
1245         device->handle = handle;
1246         device->parent = acpi_bus_get_parent(handle);
1247         device->bus_ops = *ops; /* workround for not call .start */
1248         STRUCT_TO_INT(device->status) = sta;
1249
1250         acpi_device_get_busid(device);
1251
1252         /*
1253          * Flags
1254          * -----
1255          * Note that we only look for object handles -- cannot evaluate objects
1256          * until we know the device is present and properly initialized.
1257          */
1258         result = acpi_bus_get_flags(device);
1259         if (result)
1260                 goto end;
1261
1262         /*
1263          * Initialize Device
1264          * -----------------
1265          * TBD: Synch with Core's enumeration/initialization process.
1266          */
1267         acpi_device_set_id(device);
1268
1269         /*
1270          * Power Management
1271          * ----------------
1272          */
1273         if (device->flags.power_manageable) {
1274                 result = acpi_bus_get_power_flags(device);
1275                 if (result)
1276                         goto end;
1277         }
1278
1279         /*
1280          * Wakeup device management
1281          *-----------------------
1282          */
1283         acpi_bus_get_wakeup_device_flags(device);
1284
1285         /*
1286          * Performance Management
1287          * ----------------------
1288          */
1289         if (device->flags.performance_manageable) {
1290                 result = acpi_bus_get_perf_flags(device);
1291                 if (result)
1292                         goto end;
1293         }
1294
1295         if ((result = acpi_device_set_context(device)))
1296                 goto end;
1297
1298         result = acpi_device_register(device);
1299
1300         /*
1301          * Bind _ADR-Based Devices when hot add
1302          */
1303         if (device->flags.bus_address) {
1304                 if (device->parent && device->parent->ops.bind)
1305                         device->parent->ops.bind(device);
1306         }
1307
1308 end:
1309         if (!result) {
1310                 acpi_get_name(handle, ACPI_FULL_PATHNAME, &buffer);
1311                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
1312                         "Adding %s [%s] parent %s\n", dev_name(&device->dev),
1313                          (char *) buffer.pointer,
1314                          device->parent ? dev_name(&device->parent->dev) :
1315                                           "(null)"));
1316                 kfree(buffer.pointer);
1317                 *child = device;
1318         } else
1319                 acpi_device_release(&device->dev);
1320
1321         return result;
1322 }
1323
1324 #define ACPI_STA_DEFAULT (ACPI_STA_DEVICE_PRESENT | ACPI_STA_DEVICE_ENABLED | \
1325                           ACPI_STA_DEVICE_UI      | ACPI_STA_DEVICE_FUNCTIONING)
1326
1327 static void acpi_bus_add_power_resource(acpi_handle handle)
1328 {
1329         struct acpi_bus_ops ops = {
1330                 .acpi_op_add = 1,
1331                 .acpi_op_start = 1,
1332         };
1333         struct acpi_device *device = NULL;
1334
1335         acpi_bus_get_device(handle, &device);
1336         if (!device)
1337                 acpi_add_single_object(&device, handle, ACPI_BUS_TYPE_POWER,
1338                                         ACPI_STA_DEFAULT, &ops);
1339 }
1340
1341 static int acpi_bus_type_and_status(acpi_handle handle, int *type,
1342                                     unsigned long long *sta)
1343 {
1344         acpi_status status;
1345         acpi_object_type acpi_type;
1346
1347         status = acpi_get_type(handle, &acpi_type);
1348         if (ACPI_FAILURE(status))
1349                 return -ENODEV;
1350
1351         switch (acpi_type) {
1352         case ACPI_TYPE_ANY:             /* for ACPI_ROOT_OBJECT */
1353         case ACPI_TYPE_DEVICE:
1354                 *type = ACPI_BUS_TYPE_DEVICE;
1355                 status = acpi_bus_get_status_handle(handle, sta);
1356                 if (ACPI_FAILURE(status))
1357                         return -ENODEV;
1358                 break;
1359         case ACPI_TYPE_PROCESSOR:
1360                 *type = ACPI_BUS_TYPE_PROCESSOR;
1361                 status = acpi_bus_get_status_handle(handle, sta);
1362                 if (ACPI_FAILURE(status))
1363                         return -ENODEV;
1364                 break;
1365         case ACPI_TYPE_THERMAL:
1366                 *type = ACPI_BUS_TYPE_THERMAL;
1367                 *sta = ACPI_STA_DEFAULT;
1368                 break;
1369         case ACPI_TYPE_POWER:
1370                 *type = ACPI_BUS_TYPE_POWER;
1371                 *sta = ACPI_STA_DEFAULT;
1372                 break;
1373         default:
1374                 return -ENODEV;
1375         }
1376
1377         return 0;
1378 }
1379
1380 static acpi_status acpi_bus_check_add(acpi_handle handle, u32 lvl,
1381                                       void *context, void **return_value)
1382 {
1383         struct acpi_bus_ops *ops = context;
1384         int type;
1385         unsigned long long sta;
1386         struct acpi_device *device;
1387         acpi_status status;
1388         int result;
1389
1390         result = acpi_bus_type_and_status(handle, &type, &sta);
1391         if (result)
1392                 return AE_OK;
1393
1394         if (!(sta & ACPI_STA_DEVICE_PRESENT) &&
1395             !(sta & ACPI_STA_DEVICE_FUNCTIONING)) {
1396                 struct acpi_device_wakeup wakeup;
1397                 acpi_handle temp;
1398
1399                 status = acpi_get_handle(handle, "_PRW", &temp);
1400                 if (ACPI_SUCCESS(status))
1401                         acpi_bus_extract_wakeup_device_power_package(handle,
1402                                                                      &wakeup);
1403                 return AE_CTRL_DEPTH;
1404         }
1405
1406         /*
1407          * We may already have an acpi_device from a previous enumeration.  If
1408          * so, we needn't add it again, but we may still have to start it.
1409          */
1410         device = NULL;
1411         acpi_bus_get_device(handle, &device);
1412         if (ops->acpi_op_add && !device)
1413                 acpi_add_single_object(&device, handle, type, sta, ops);
1414
1415         if (!device)
1416                 return AE_CTRL_DEPTH;
1417
1418         if (ops->acpi_op_start && !(ops->acpi_op_add)) {
1419                 status = acpi_start_single_object(device);
1420                 if (ACPI_FAILURE(status))
1421                         return AE_CTRL_DEPTH;
1422         }
1423
1424         if (!*return_value)
1425                 *return_value = device;
1426         return AE_OK;
1427 }
1428
1429 static int acpi_bus_scan(acpi_handle handle, struct acpi_bus_ops *ops,
1430                          struct acpi_device **child)
1431 {
1432         acpi_status status;
1433         void *device = NULL;
1434
1435         status = acpi_bus_check_add(handle, 0, ops, &device);
1436         if (ACPI_SUCCESS(status))
1437                 acpi_walk_namespace(ACPI_TYPE_ANY, handle, ACPI_UINT32_MAX,
1438                                     acpi_bus_check_add, NULL, ops, &device);
1439
1440         if (child)
1441                 *child = device;
1442
1443         if (device)
1444                 return 0;
1445         else
1446                 return -ENODEV;
1447 }
1448
1449 /*
1450  * acpi_bus_add and acpi_bus_start
1451  *
1452  * scan a given ACPI tree and (probably recently hot-plugged)
1453  * create and add or starts found devices.
1454  *
1455  * If no devices were found -ENODEV is returned which does not
1456  * mean that this is a real error, there just have been no suitable
1457  * ACPI objects in the table trunk from which the kernel could create
1458  * a device and add/start an appropriate driver.
1459  */
1460
1461 int
1462 acpi_bus_add(struct acpi_device **child,
1463              struct acpi_device *parent, acpi_handle handle, int type)
1464 {
1465         struct acpi_bus_ops ops;
1466
1467         memset(&ops, 0, sizeof(ops));
1468         ops.acpi_op_add = 1;
1469
1470         return acpi_bus_scan(handle, &ops, child);
1471 }
1472 EXPORT_SYMBOL(acpi_bus_add);
1473
1474 int acpi_bus_start(struct acpi_device *device)
1475 {
1476         struct acpi_bus_ops ops;
1477         int result;
1478
1479         if (!device)
1480                 return -EINVAL;
1481
1482         memset(&ops, 0, sizeof(ops));
1483         ops.acpi_op_start = 1;
1484
1485         result = acpi_bus_scan(device->handle, &ops, NULL);
1486
1487         acpi_update_all_gpes();
1488
1489         return result;
1490 }
1491 EXPORT_SYMBOL(acpi_bus_start);
1492
1493 int acpi_bus_trim(struct acpi_device *start, int rmdevice)
1494 {
1495         acpi_status status;
1496         struct acpi_device *parent, *child;
1497         acpi_handle phandle, chandle;
1498         acpi_object_type type;
1499         u32 level = 1;
1500         int err = 0;
1501
1502         parent = start;
1503         phandle = start->handle;
1504         child = chandle = NULL;
1505
1506         while ((level > 0) && parent && (!err)) {
1507                 status = acpi_get_next_object(ACPI_TYPE_ANY, phandle,
1508                                               chandle, &chandle);
1509
1510                 /*
1511                  * If this scope is exhausted then move our way back up.
1512                  */
1513                 if (ACPI_FAILURE(status)) {
1514                         level--;
1515                         chandle = phandle;
1516                         acpi_get_parent(phandle, &phandle);
1517                         child = parent;
1518                         parent = parent->parent;
1519
1520                         if (level == 0)
1521                                 err = acpi_bus_remove(child, rmdevice);
1522                         else
1523                                 err = acpi_bus_remove(child, 1);
1524
1525                         continue;
1526                 }
1527
1528                 status = acpi_get_type(chandle, &type);
1529                 if (ACPI_FAILURE(status)) {
1530                         continue;
1531                 }
1532                 /*
1533                  * If there is a device corresponding to chandle then
1534                  * parse it (depth-first).
1535                  */
1536                 if (acpi_bus_get_device(chandle, &child) == 0) {
1537                         level++;
1538                         phandle = chandle;
1539                         chandle = NULL;
1540                         parent = child;
1541                 }
1542                 continue;
1543         }
1544         return err;
1545 }
1546 EXPORT_SYMBOL_GPL(acpi_bus_trim);
1547
1548 static int acpi_bus_scan_fixed(void)
1549 {
1550         int result = 0;
1551         struct acpi_device *device = NULL;
1552         struct acpi_bus_ops ops;
1553
1554         memset(&ops, 0, sizeof(ops));
1555         ops.acpi_op_add = 1;
1556         ops.acpi_op_start = 1;
1557
1558         /*
1559          * Enumerate all fixed-feature devices.
1560          */
1561         if ((acpi_gbl_FADT.flags & ACPI_FADT_POWER_BUTTON) == 0) {
1562                 result = acpi_add_single_object(&device, NULL,
1563                                                 ACPI_BUS_TYPE_POWER_BUTTON,
1564                                                 ACPI_STA_DEFAULT,
1565                                                 &ops);
1566         }
1567
1568         if ((acpi_gbl_FADT.flags & ACPI_FADT_SLEEP_BUTTON) == 0) {
1569                 result = acpi_add_single_object(&device, NULL,
1570                                                 ACPI_BUS_TYPE_SLEEP_BUTTON,
1571                                                 ACPI_STA_DEFAULT,
1572                                                 &ops);
1573         }
1574
1575         return result;
1576 }
1577
1578 int __init acpi_scan_init(void)
1579 {
1580         int result;
1581         struct acpi_bus_ops ops;
1582
1583         memset(&ops, 0, sizeof(ops));
1584         ops.acpi_op_add = 1;
1585         ops.acpi_op_start = 1;
1586
1587         result = bus_register(&acpi_bus_type);
1588         if (result) {
1589                 /* We don't want to quit even if we failed to add suspend/resume */
1590                 printk(KERN_ERR PREFIX "Could not register bus type\n");
1591         }
1592
1593         acpi_power_init();
1594
1595         /*
1596          * Enumerate devices in the ACPI namespace.
1597          */
1598         result = acpi_bus_scan(ACPI_ROOT_OBJECT, &ops, &acpi_root);
1599
1600         if (!result)
1601                 result = acpi_bus_scan_fixed();
1602
1603         if (result)
1604                 acpi_device_unregister(acpi_root, ACPI_BUS_REMOVAL_NORMAL);
1605         else
1606                 acpi_update_all_gpes();
1607
1608         return result;
1609 }