]> git.karo-electronics.de Git - karo-tx-linux.git/blob - drivers/acpi/scan.c
Merge branch 'upstream' of git://git.kernel.org/pub/scm/linux/kernel/git/jikos/floppy...
[karo-tx-linux.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_HOT; 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                         for (j = 0; j < ps->resources.count; j++)
884                                 acpi_bus_add_power_resource(ps->resources.handles[j]);
885                 }
886
887                 /* Evaluate "_PSx" to see if we can do explicit sets */
888                 object_name[2] = 'S';
889                 status = acpi_get_handle(device->handle, object_name, &handle);
890                 if (ACPI_SUCCESS(status))
891                         ps->flags.explicit_set = 1;
892
893                 /*
894                  * State is valid if there are means to put the device into it.
895                  * D3hot is only valid if _PR3 present.
896                  */
897                 if (ps->resources.count ||
898                     (ps->flags.explicit_set && i < ACPI_STATE_D3_HOT))
899                         ps->flags.valid = 1;
900
901                 ps->power = -1; /* Unknown - driver assigned */
902                 ps->latency = -1;       /* Unknown - driver assigned */
903         }
904
905         /* Set defaults for D0 and D3 states (always valid) */
906         device->power.states[ACPI_STATE_D0].flags.valid = 1;
907         device->power.states[ACPI_STATE_D0].power = 100;
908         device->power.states[ACPI_STATE_D3].flags.valid = 1;
909         device->power.states[ACPI_STATE_D3].power = 0;
910
911         /* Set D3cold's explicit_set flag if _PS3 exists. */
912         if (device->power.states[ACPI_STATE_D3_HOT].flags.explicit_set)
913                 device->power.states[ACPI_STATE_D3_COLD].flags.explicit_set = 1;
914
915         acpi_bus_init_power(device);
916
917         return 0;
918 }
919
920 static int acpi_bus_get_flags(struct acpi_device *device)
921 {
922         acpi_status status = AE_OK;
923         acpi_handle temp = NULL;
924
925
926         /* Presence of _STA indicates 'dynamic_status' */
927         status = acpi_get_handle(device->handle, "_STA", &temp);
928         if (ACPI_SUCCESS(status))
929                 device->flags.dynamic_status = 1;
930
931         /* Presence of _RMV indicates 'removable' */
932         status = acpi_get_handle(device->handle, "_RMV", &temp);
933         if (ACPI_SUCCESS(status))
934                 device->flags.removable = 1;
935
936         /* Presence of _EJD|_EJ0 indicates 'ejectable' */
937         status = acpi_get_handle(device->handle, "_EJD", &temp);
938         if (ACPI_SUCCESS(status))
939                 device->flags.ejectable = 1;
940         else {
941                 status = acpi_get_handle(device->handle, "_EJ0", &temp);
942                 if (ACPI_SUCCESS(status))
943                         device->flags.ejectable = 1;
944         }
945
946         /* Presence of _LCK indicates 'lockable' */
947         status = acpi_get_handle(device->handle, "_LCK", &temp);
948         if (ACPI_SUCCESS(status))
949                 device->flags.lockable = 1;
950
951         /* Power resources cannot be power manageable. */
952         if (device->device_type == ACPI_BUS_TYPE_POWER)
953                 return 0;
954
955         /* Presence of _PS0|_PR0 indicates 'power manageable' */
956         status = acpi_get_handle(device->handle, "_PS0", &temp);
957         if (ACPI_FAILURE(status))
958                 status = acpi_get_handle(device->handle, "_PR0", &temp);
959         if (ACPI_SUCCESS(status))
960                 device->flags.power_manageable = 1;
961
962         /* TBD: Performance management */
963
964         return 0;
965 }
966
967 static void acpi_device_get_busid(struct acpi_device *device)
968 {
969         char bus_id[5] = { '?', 0 };
970         struct acpi_buffer buffer = { sizeof(bus_id), bus_id };
971         int i = 0;
972
973         /*
974          * Bus ID
975          * ------
976          * The device's Bus ID is simply the object name.
977          * TBD: Shouldn't this value be unique (within the ACPI namespace)?
978          */
979         if (ACPI_IS_ROOT_DEVICE(device)) {
980                 strcpy(device->pnp.bus_id, "ACPI");
981                 return;
982         }
983
984         switch (device->device_type) {
985         case ACPI_BUS_TYPE_POWER_BUTTON:
986                 strcpy(device->pnp.bus_id, "PWRF");
987                 break;
988         case ACPI_BUS_TYPE_SLEEP_BUTTON:
989                 strcpy(device->pnp.bus_id, "SLPF");
990                 break;
991         default:
992                 acpi_get_name(device->handle, ACPI_SINGLE_NAME, &buffer);
993                 /* Clean up trailing underscores (if any) */
994                 for (i = 3; i > 1; i--) {
995                         if (bus_id[i] == '_')
996                                 bus_id[i] = '\0';
997                         else
998                                 break;
999                 }
1000                 strcpy(device->pnp.bus_id, bus_id);
1001                 break;
1002         }
1003 }
1004
1005 /*
1006  * acpi_bay_match - see if a device is an ejectable driver bay
1007  *
1008  * If an acpi object is ejectable and has one of the ACPI ATA methods defined,
1009  * then we can safely call it an ejectable drive bay
1010  */
1011 static int acpi_bay_match(struct acpi_device *device){
1012         acpi_status status;
1013         acpi_handle handle;
1014         acpi_handle tmp;
1015         acpi_handle phandle;
1016
1017         handle = device->handle;
1018
1019         status = acpi_get_handle(handle, "_EJ0", &tmp);
1020         if (ACPI_FAILURE(status))
1021                 return -ENODEV;
1022
1023         if ((ACPI_SUCCESS(acpi_get_handle(handle, "_GTF", &tmp))) ||
1024                 (ACPI_SUCCESS(acpi_get_handle(handle, "_GTM", &tmp))) ||
1025                 (ACPI_SUCCESS(acpi_get_handle(handle, "_STM", &tmp))) ||
1026                 (ACPI_SUCCESS(acpi_get_handle(handle, "_SDD", &tmp))))
1027                 return 0;
1028
1029         if (acpi_get_parent(handle, &phandle))
1030                 return -ENODEV;
1031
1032         if ((ACPI_SUCCESS(acpi_get_handle(phandle, "_GTF", &tmp))) ||
1033                 (ACPI_SUCCESS(acpi_get_handle(phandle, "_GTM", &tmp))) ||
1034                 (ACPI_SUCCESS(acpi_get_handle(phandle, "_STM", &tmp))) ||
1035                 (ACPI_SUCCESS(acpi_get_handle(phandle, "_SDD", &tmp))))
1036                 return 0;
1037
1038         return -ENODEV;
1039 }
1040
1041 /*
1042  * acpi_dock_match - see if a device has a _DCK method
1043  */
1044 static int acpi_dock_match(struct acpi_device *device)
1045 {
1046         acpi_handle tmp;
1047         return acpi_get_handle(device->handle, "_DCK", &tmp);
1048 }
1049
1050 const char *acpi_device_hid(struct acpi_device *device)
1051 {
1052         struct acpi_hardware_id *hid;
1053
1054         if (list_empty(&device->pnp.ids))
1055                 return dummy_hid;
1056
1057         hid = list_first_entry(&device->pnp.ids, struct acpi_hardware_id, list);
1058         return hid->id;
1059 }
1060 EXPORT_SYMBOL(acpi_device_hid);
1061
1062 static void acpi_add_id(struct acpi_device *device, const char *dev_id)
1063 {
1064         struct acpi_hardware_id *id;
1065
1066         id = kmalloc(sizeof(*id), GFP_KERNEL);
1067         if (!id)
1068                 return;
1069
1070         id->id = kstrdup(dev_id, GFP_KERNEL);
1071         if (!id->id) {
1072                 kfree(id);
1073                 return;
1074         }
1075
1076         list_add_tail(&id->list, &device->pnp.ids);
1077 }
1078
1079 /*
1080  * Old IBM workstations have a DSDT bug wherein the SMBus object
1081  * lacks the SMBUS01 HID and the methods do not have the necessary "_"
1082  * prefix.  Work around this.
1083  */
1084 static int acpi_ibm_smbus_match(struct acpi_device *device)
1085 {
1086         acpi_handle h_dummy;
1087         struct acpi_buffer path = {ACPI_ALLOCATE_BUFFER, NULL};
1088         int result;
1089
1090         if (!dmi_name_in_vendors("IBM"))
1091                 return -ENODEV;
1092
1093         /* Look for SMBS object */
1094         result = acpi_get_name(device->handle, ACPI_SINGLE_NAME, &path);
1095         if (result)
1096                 return result;
1097
1098         if (strcmp("SMBS", path.pointer)) {
1099                 result = -ENODEV;
1100                 goto out;
1101         }
1102
1103         /* Does it have the necessary (but misnamed) methods? */
1104         result = -ENODEV;
1105         if (ACPI_SUCCESS(acpi_get_handle(device->handle, "SBI", &h_dummy)) &&
1106             ACPI_SUCCESS(acpi_get_handle(device->handle, "SBR", &h_dummy)) &&
1107             ACPI_SUCCESS(acpi_get_handle(device->handle, "SBW", &h_dummy)))
1108                 result = 0;
1109 out:
1110         kfree(path.pointer);
1111         return result;
1112 }
1113
1114 static void acpi_device_set_id(struct acpi_device *device)
1115 {
1116         acpi_status status;
1117         struct acpi_device_info *info;
1118         struct acpica_device_id_list *cid_list;
1119         int i;
1120
1121         switch (device->device_type) {
1122         case ACPI_BUS_TYPE_DEVICE:
1123                 if (ACPI_IS_ROOT_DEVICE(device)) {
1124                         acpi_add_id(device, ACPI_SYSTEM_HID);
1125                         break;
1126                 }
1127
1128                 status = acpi_get_object_info(device->handle, &info);
1129                 if (ACPI_FAILURE(status)) {
1130                         printk(KERN_ERR PREFIX "%s: Error reading device info\n", __func__);
1131                         return;
1132                 }
1133
1134                 if (info->valid & ACPI_VALID_HID)
1135                         acpi_add_id(device, info->hardware_id.string);
1136                 if (info->valid & ACPI_VALID_CID) {
1137                         cid_list = &info->compatible_id_list;
1138                         for (i = 0; i < cid_list->count; i++)
1139                                 acpi_add_id(device, cid_list->ids[i].string);
1140                 }
1141                 if (info->valid & ACPI_VALID_ADR) {
1142                         device->pnp.bus_address = info->address;
1143                         device->flags.bus_address = 1;
1144                 }
1145
1146                 kfree(info);
1147
1148                 /*
1149                  * Some devices don't reliably have _HIDs & _CIDs, so add
1150                  * synthetic HIDs to make sure drivers can find them.
1151                  */
1152                 if (acpi_is_video_device(device))
1153                         acpi_add_id(device, ACPI_VIDEO_HID);
1154                 else if (ACPI_SUCCESS(acpi_bay_match(device)))
1155                         acpi_add_id(device, ACPI_BAY_HID);
1156                 else if (ACPI_SUCCESS(acpi_dock_match(device)))
1157                         acpi_add_id(device, ACPI_DOCK_HID);
1158                 else if (!acpi_ibm_smbus_match(device))
1159                         acpi_add_id(device, ACPI_SMBUS_IBM_HID);
1160                 else if (!acpi_device_hid(device) &&
1161                          ACPI_IS_ROOT_DEVICE(device->parent)) {
1162                         acpi_add_id(device, ACPI_BUS_HID); /* \_SB, LNXSYBUS */
1163                         strcpy(device->pnp.device_name, ACPI_BUS_DEVICE_NAME);
1164                         strcpy(device->pnp.device_class, ACPI_BUS_CLASS);
1165                 }
1166
1167                 break;
1168         case ACPI_BUS_TYPE_POWER:
1169                 acpi_add_id(device, ACPI_POWER_HID);
1170                 break;
1171         case ACPI_BUS_TYPE_PROCESSOR:
1172                 acpi_add_id(device, ACPI_PROCESSOR_OBJECT_HID);
1173                 break;
1174         case ACPI_BUS_TYPE_THERMAL:
1175                 acpi_add_id(device, ACPI_THERMAL_HID);
1176                 break;
1177         case ACPI_BUS_TYPE_POWER_BUTTON:
1178                 acpi_add_id(device, ACPI_BUTTON_HID_POWERF);
1179                 break;
1180         case ACPI_BUS_TYPE_SLEEP_BUTTON:
1181                 acpi_add_id(device, ACPI_BUTTON_HID_SLEEPF);
1182                 break;
1183         }
1184 }
1185
1186 static int acpi_device_set_context(struct acpi_device *device)
1187 {
1188         acpi_status status;
1189
1190         /*
1191          * Context
1192          * -------
1193          * Attach this 'struct acpi_device' to the ACPI object.  This makes
1194          * resolutions from handle->device very efficient.  Fixed hardware
1195          * devices have no handles, so we skip them.
1196          */
1197         if (!device->handle)
1198                 return 0;
1199
1200         status = acpi_attach_data(device->handle,
1201                                   acpi_bus_data_handler, device);
1202         if (ACPI_SUCCESS(status))
1203                 return 0;
1204
1205         printk(KERN_ERR PREFIX "Error attaching device data\n");
1206         return -ENODEV;
1207 }
1208
1209 static int acpi_bus_remove(struct acpi_device *dev, int rmdevice)
1210 {
1211         if (!dev)
1212                 return -EINVAL;
1213
1214         dev->removal_type = ACPI_BUS_REMOVAL_EJECT;
1215         device_release_driver(&dev->dev);
1216
1217         if (!rmdevice)
1218                 return 0;
1219
1220         /*
1221          * unbind _ADR-Based Devices when hot removal
1222          */
1223         if (dev->flags.bus_address) {
1224                 if ((dev->parent) && (dev->parent->ops.unbind))
1225                         dev->parent->ops.unbind(dev);
1226         }
1227         acpi_device_unregister(dev, ACPI_BUS_REMOVAL_EJECT);
1228
1229         return 0;
1230 }
1231
1232 static int acpi_add_single_object(struct acpi_device **child,
1233                                   acpi_handle handle, int type,
1234                                   unsigned long long sta,
1235                                   struct acpi_bus_ops *ops)
1236 {
1237         int result;
1238         struct acpi_device *device;
1239         struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
1240
1241         device = kzalloc(sizeof(struct acpi_device), GFP_KERNEL);
1242         if (!device) {
1243                 printk(KERN_ERR PREFIX "Memory allocation error\n");
1244                 return -ENOMEM;
1245         }
1246
1247         INIT_LIST_HEAD(&device->pnp.ids);
1248         device->device_type = type;
1249         device->handle = handle;
1250         device->parent = acpi_bus_get_parent(handle);
1251         device->bus_ops = *ops; /* workround for not call .start */
1252         STRUCT_TO_INT(device->status) = sta;
1253
1254         acpi_device_get_busid(device);
1255
1256         /*
1257          * Flags
1258          * -----
1259          * Note that we only look for object handles -- cannot evaluate objects
1260          * until we know the device is present and properly initialized.
1261          */
1262         result = acpi_bus_get_flags(device);
1263         if (result)
1264                 goto end;
1265
1266         /*
1267          * Initialize Device
1268          * -----------------
1269          * TBD: Synch with Core's enumeration/initialization process.
1270          */
1271         acpi_device_set_id(device);
1272
1273         /*
1274          * Power Management
1275          * ----------------
1276          */
1277         if (device->flags.power_manageable) {
1278                 result = acpi_bus_get_power_flags(device);
1279                 if (result)
1280                         goto end;
1281         }
1282
1283         /*
1284          * Wakeup device management
1285          *-----------------------
1286          */
1287         acpi_bus_get_wakeup_device_flags(device);
1288
1289         /*
1290          * Performance Management
1291          * ----------------------
1292          */
1293         if (device->flags.performance_manageable) {
1294                 result = acpi_bus_get_perf_flags(device);
1295                 if (result)
1296                         goto end;
1297         }
1298
1299         if ((result = acpi_device_set_context(device)))
1300                 goto end;
1301
1302         result = acpi_device_register(device);
1303
1304         /*
1305          * Bind _ADR-Based Devices when hot add
1306          */
1307         if (device->flags.bus_address) {
1308                 if (device->parent && device->parent->ops.bind)
1309                         device->parent->ops.bind(device);
1310         }
1311
1312 end:
1313         if (!result) {
1314                 acpi_get_name(handle, ACPI_FULL_PATHNAME, &buffer);
1315                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
1316                         "Adding %s [%s] parent %s\n", dev_name(&device->dev),
1317                          (char *) buffer.pointer,
1318                          device->parent ? dev_name(&device->parent->dev) :
1319                                           "(null)"));
1320                 kfree(buffer.pointer);
1321                 *child = device;
1322         } else
1323                 acpi_device_release(&device->dev);
1324
1325         return result;
1326 }
1327
1328 #define ACPI_STA_DEFAULT (ACPI_STA_DEVICE_PRESENT | ACPI_STA_DEVICE_ENABLED | \
1329                           ACPI_STA_DEVICE_UI      | ACPI_STA_DEVICE_FUNCTIONING)
1330
1331 static void acpi_bus_add_power_resource(acpi_handle handle)
1332 {
1333         struct acpi_bus_ops ops = {
1334                 .acpi_op_add = 1,
1335                 .acpi_op_start = 1,
1336         };
1337         struct acpi_device *device = NULL;
1338
1339         acpi_bus_get_device(handle, &device);
1340         if (!device)
1341                 acpi_add_single_object(&device, handle, ACPI_BUS_TYPE_POWER,
1342                                         ACPI_STA_DEFAULT, &ops);
1343 }
1344
1345 static int acpi_bus_type_and_status(acpi_handle handle, int *type,
1346                                     unsigned long long *sta)
1347 {
1348         acpi_status status;
1349         acpi_object_type acpi_type;
1350
1351         status = acpi_get_type(handle, &acpi_type);
1352         if (ACPI_FAILURE(status))
1353                 return -ENODEV;
1354
1355         switch (acpi_type) {
1356         case ACPI_TYPE_ANY:             /* for ACPI_ROOT_OBJECT */
1357         case ACPI_TYPE_DEVICE:
1358                 *type = ACPI_BUS_TYPE_DEVICE;
1359                 status = acpi_bus_get_status_handle(handle, sta);
1360                 if (ACPI_FAILURE(status))
1361                         return -ENODEV;
1362                 break;
1363         case ACPI_TYPE_PROCESSOR:
1364                 *type = ACPI_BUS_TYPE_PROCESSOR;
1365                 status = acpi_bus_get_status_handle(handle, sta);
1366                 if (ACPI_FAILURE(status))
1367                         return -ENODEV;
1368                 break;
1369         case ACPI_TYPE_THERMAL:
1370                 *type = ACPI_BUS_TYPE_THERMAL;
1371                 *sta = ACPI_STA_DEFAULT;
1372                 break;
1373         case ACPI_TYPE_POWER:
1374                 *type = ACPI_BUS_TYPE_POWER;
1375                 *sta = ACPI_STA_DEFAULT;
1376                 break;
1377         default:
1378                 return -ENODEV;
1379         }
1380
1381         return 0;
1382 }
1383
1384 static acpi_status acpi_bus_check_add(acpi_handle handle, u32 lvl,
1385                                       void *context, void **return_value)
1386 {
1387         struct acpi_bus_ops *ops = context;
1388         int type;
1389         unsigned long long sta;
1390         struct acpi_device *device;
1391         acpi_status status;
1392         int result;
1393
1394         result = acpi_bus_type_and_status(handle, &type, &sta);
1395         if (result)
1396                 return AE_OK;
1397
1398         if (!(sta & ACPI_STA_DEVICE_PRESENT) &&
1399             !(sta & ACPI_STA_DEVICE_FUNCTIONING)) {
1400                 struct acpi_device_wakeup wakeup;
1401                 acpi_handle temp;
1402
1403                 status = acpi_get_handle(handle, "_PRW", &temp);
1404                 if (ACPI_SUCCESS(status))
1405                         acpi_bus_extract_wakeup_device_power_package(handle,
1406                                                                      &wakeup);
1407                 return AE_CTRL_DEPTH;
1408         }
1409
1410         /*
1411          * We may already have an acpi_device from a previous enumeration.  If
1412          * so, we needn't add it again, but we may still have to start it.
1413          */
1414         device = NULL;
1415         acpi_bus_get_device(handle, &device);
1416         if (ops->acpi_op_add && !device)
1417                 acpi_add_single_object(&device, handle, type, sta, ops);
1418
1419         if (!device)
1420                 return AE_CTRL_DEPTH;
1421
1422         if (ops->acpi_op_start && !(ops->acpi_op_add)) {
1423                 status = acpi_start_single_object(device);
1424                 if (ACPI_FAILURE(status))
1425                         return AE_CTRL_DEPTH;
1426         }
1427
1428         if (!*return_value)
1429                 *return_value = device;
1430         return AE_OK;
1431 }
1432
1433 static int acpi_bus_scan(acpi_handle handle, struct acpi_bus_ops *ops,
1434                          struct acpi_device **child)
1435 {
1436         acpi_status status;
1437         void *device = NULL;
1438
1439         status = acpi_bus_check_add(handle, 0, ops, &device);
1440         if (ACPI_SUCCESS(status))
1441                 acpi_walk_namespace(ACPI_TYPE_ANY, handle, ACPI_UINT32_MAX,
1442                                     acpi_bus_check_add, NULL, ops, &device);
1443
1444         if (child)
1445                 *child = device;
1446
1447         if (device)
1448                 return 0;
1449         else
1450                 return -ENODEV;
1451 }
1452
1453 /*
1454  * acpi_bus_add and acpi_bus_start
1455  *
1456  * scan a given ACPI tree and (probably recently hot-plugged)
1457  * create and add or starts found devices.
1458  *
1459  * If no devices were found -ENODEV is returned which does not
1460  * mean that this is a real error, there just have been no suitable
1461  * ACPI objects in the table trunk from which the kernel could create
1462  * a device and add/start an appropriate driver.
1463  */
1464
1465 int
1466 acpi_bus_add(struct acpi_device **child,
1467              struct acpi_device *parent, acpi_handle handle, int type)
1468 {
1469         struct acpi_bus_ops ops;
1470
1471         memset(&ops, 0, sizeof(ops));
1472         ops.acpi_op_add = 1;
1473
1474         return acpi_bus_scan(handle, &ops, child);
1475 }
1476 EXPORT_SYMBOL(acpi_bus_add);
1477
1478 int acpi_bus_start(struct acpi_device *device)
1479 {
1480         struct acpi_bus_ops ops;
1481         int result;
1482
1483         if (!device)
1484                 return -EINVAL;
1485
1486         memset(&ops, 0, sizeof(ops));
1487         ops.acpi_op_start = 1;
1488
1489         result = acpi_bus_scan(device->handle, &ops, NULL);
1490
1491         acpi_update_all_gpes();
1492
1493         return result;
1494 }
1495 EXPORT_SYMBOL(acpi_bus_start);
1496
1497 int acpi_bus_trim(struct acpi_device *start, int rmdevice)
1498 {
1499         acpi_status status;
1500         struct acpi_device *parent, *child;
1501         acpi_handle phandle, chandle;
1502         acpi_object_type type;
1503         u32 level = 1;
1504         int err = 0;
1505
1506         parent = start;
1507         phandle = start->handle;
1508         child = chandle = NULL;
1509
1510         while ((level > 0) && parent && (!err)) {
1511                 status = acpi_get_next_object(ACPI_TYPE_ANY, phandle,
1512                                               chandle, &chandle);
1513
1514                 /*
1515                  * If this scope is exhausted then move our way back up.
1516                  */
1517                 if (ACPI_FAILURE(status)) {
1518                         level--;
1519                         chandle = phandle;
1520                         acpi_get_parent(phandle, &phandle);
1521                         child = parent;
1522                         parent = parent->parent;
1523
1524                         if (level == 0)
1525                                 err = acpi_bus_remove(child, rmdevice);
1526                         else
1527                                 err = acpi_bus_remove(child, 1);
1528
1529                         continue;
1530                 }
1531
1532                 status = acpi_get_type(chandle, &type);
1533                 if (ACPI_FAILURE(status)) {
1534                         continue;
1535                 }
1536                 /*
1537                  * If there is a device corresponding to chandle then
1538                  * parse it (depth-first).
1539                  */
1540                 if (acpi_bus_get_device(chandle, &child) == 0) {
1541                         level++;
1542                         phandle = chandle;
1543                         chandle = NULL;
1544                         parent = child;
1545                 }
1546                 continue;
1547         }
1548         return err;
1549 }
1550 EXPORT_SYMBOL_GPL(acpi_bus_trim);
1551
1552 static int acpi_bus_scan_fixed(void)
1553 {
1554         int result = 0;
1555         struct acpi_device *device = NULL;
1556         struct acpi_bus_ops ops;
1557
1558         memset(&ops, 0, sizeof(ops));
1559         ops.acpi_op_add = 1;
1560         ops.acpi_op_start = 1;
1561
1562         /*
1563          * Enumerate all fixed-feature devices.
1564          */
1565         if ((acpi_gbl_FADT.flags & ACPI_FADT_POWER_BUTTON) == 0) {
1566                 result = acpi_add_single_object(&device, NULL,
1567                                                 ACPI_BUS_TYPE_POWER_BUTTON,
1568                                                 ACPI_STA_DEFAULT,
1569                                                 &ops);
1570                 device_init_wakeup(&device->dev, true);
1571         }
1572
1573         if ((acpi_gbl_FADT.flags & ACPI_FADT_SLEEP_BUTTON) == 0) {
1574                 result = acpi_add_single_object(&device, NULL,
1575                                                 ACPI_BUS_TYPE_SLEEP_BUTTON,
1576                                                 ACPI_STA_DEFAULT,
1577                                                 &ops);
1578         }
1579
1580         return result;
1581 }
1582
1583 int __init acpi_scan_init(void)
1584 {
1585         int result;
1586         struct acpi_bus_ops ops;
1587
1588         memset(&ops, 0, sizeof(ops));
1589         ops.acpi_op_add = 1;
1590         ops.acpi_op_start = 1;
1591
1592         result = bus_register(&acpi_bus_type);
1593         if (result) {
1594                 /* We don't want to quit even if we failed to add suspend/resume */
1595                 printk(KERN_ERR PREFIX "Could not register bus type\n");
1596         }
1597
1598         acpi_power_init();
1599
1600         /*
1601          * Enumerate devices in the ACPI namespace.
1602          */
1603         result = acpi_bus_scan(ACPI_ROOT_OBJECT, &ops, &acpi_root);
1604
1605         if (!result)
1606                 result = acpi_bus_scan_fixed();
1607
1608         if (result)
1609                 acpi_device_unregister(acpi_root, ACPI_BUS_REMOVAL_NORMAL);
1610         else
1611                 acpi_update_all_gpes();
1612
1613         return result;
1614 }