Merge branch 'acpica' into release
[linux-2.6.git] / drivers / acpi / scan.c
1 /*
2  * scan.c - support for transforming the ACPI namespace into individual objects
3  */
4
5 #include <linux/module.h>
6 #include <linux/init.h>
7 #include <linux/kernel.h>
8 #include <linux/acpi.h>
9 #include <linux/signal.h>
10 #include <linux/kthread.h>
11
12 #include <acpi/acpi_drivers.h>
13
14 #include "internal.h"
15
16 #define _COMPONENT              ACPI_BUS_COMPONENT
17 ACPI_MODULE_NAME("scan");
18 #define STRUCT_TO_INT(s)        (*((int*)&s))
19 extern struct acpi_device *acpi_root;
20
21 #define ACPI_BUS_CLASS                  "system_bus"
22 #define ACPI_BUS_HID                    "LNXSYBUS"
23 #define ACPI_BUS_DEVICE_NAME            "System Bus"
24
25 static LIST_HEAD(acpi_device_list);
26 static LIST_HEAD(acpi_bus_id_list);
27 DEFINE_MUTEX(acpi_device_lock);
28 LIST_HEAD(acpi_wakeup_device_list);
29
30 struct acpi_device_bus_id{
31         char bus_id[15];
32         unsigned int instance_no;
33         struct list_head node;
34 };
35
36 /*
37  * Creates hid/cid(s) string needed for modalias and uevent
38  * e.g. on a device with hid:IBM0001 and cid:ACPI0001 you get:
39  * char *modalias: "acpi:IBM0001:ACPI0001"
40 */
41 static int create_modalias(struct acpi_device *acpi_dev, char *modalias,
42                            int size)
43 {
44         int len;
45         int count;
46
47         if (!acpi_dev->flags.hardware_id && !acpi_dev->flags.compatible_ids)
48                 return -ENODEV;
49
50         len = snprintf(modalias, size, "acpi:");
51         size -= len;
52
53         if (acpi_dev->flags.hardware_id) {
54                 count = snprintf(&modalias[len], size, "%s:",
55                                  acpi_dev->pnp.hardware_id);
56                 if (count < 0 || count >= size)
57                         return -EINVAL;
58                 len += count;
59                 size -= count;
60         }
61
62         if (acpi_dev->flags.compatible_ids) {
63                 struct acpica_device_id_list *cid_list;
64                 int i;
65
66                 cid_list = acpi_dev->pnp.cid_list;
67                 for (i = 0; i < cid_list->count; i++) {
68                         count = snprintf(&modalias[len], size, "%s:",
69                                          cid_list->ids[i].string);
70                         if (count < 0 || count >= size) {
71                                 printk(KERN_ERR PREFIX "%s cid[%i] exceeds event buffer size",
72                                        acpi_dev->pnp.device_name, i);
73                                 break;
74                         }
75                         len += count;
76                         size -= count;
77                 }
78         }
79
80         modalias[len] = '\0';
81         return len;
82 }
83
84 static ssize_t
85 acpi_device_modalias_show(struct device *dev, struct device_attribute *attr, char *buf) {
86         struct acpi_device *acpi_dev = to_acpi_device(dev);
87         int len;
88
89         /* Device has no HID and no CID or string is >1024 */
90         len = create_modalias(acpi_dev, buf, 1024);
91         if (len <= 0)
92                 return 0;
93         buf[len++] = '\n';
94         return len;
95 }
96 static DEVICE_ATTR(modalias, 0444, acpi_device_modalias_show, NULL);
97
98 static void acpi_bus_hot_remove_device(void *context)
99 {
100         struct acpi_device *device;
101         acpi_handle handle = context;
102         struct acpi_object_list arg_list;
103         union acpi_object arg;
104         acpi_status status = AE_OK;
105
106         if (acpi_bus_get_device(handle, &device))
107                 return;
108
109         if (!device)
110                 return;
111
112         ACPI_DEBUG_PRINT((ACPI_DB_INFO,
113                 "Hot-removing device %s...\n", dev_name(&device->dev)));
114
115         if (acpi_bus_trim(device, 1)) {
116                 printk(KERN_ERR PREFIX
117                                 "Removing device failed\n");
118                 return;
119         }
120
121         /* power off device */
122         status = acpi_evaluate_object(handle, "_PS3", NULL, NULL);
123         if (ACPI_FAILURE(status) && status != AE_NOT_FOUND)
124                 printk(KERN_WARNING PREFIX
125                                 "Power-off device failed\n");
126
127         if (device->flags.lockable) {
128                 arg_list.count = 1;
129                 arg_list.pointer = &arg;
130                 arg.type = ACPI_TYPE_INTEGER;
131                 arg.integer.value = 0;
132                 acpi_evaluate_object(handle, "_LCK", &arg_list, NULL);
133         }
134
135         arg_list.count = 1;
136         arg_list.pointer = &arg;
137         arg.type = ACPI_TYPE_INTEGER;
138         arg.integer.value = 1;
139
140         /*
141          * TBD: _EJD support.
142          */
143         status = acpi_evaluate_object(handle, "_EJ0", &arg_list, NULL);
144         if (ACPI_FAILURE(status))
145                 printk(KERN_WARNING PREFIX
146                                 "Eject device failed\n");
147
148         return;
149 }
150
151 static ssize_t
152 acpi_eject_store(struct device *d, struct device_attribute *attr,
153                 const char *buf, size_t count)
154 {
155         int ret = count;
156         acpi_status status;
157         acpi_object_type type = 0;
158         struct acpi_device *acpi_device = to_acpi_device(d);
159
160         if ((!count) || (buf[0] != '1')) {
161                 return -EINVAL;
162         }
163 #ifndef FORCE_EJECT
164         if (acpi_device->driver == NULL) {
165                 ret = -ENODEV;
166                 goto err;
167         }
168 #endif
169         status = acpi_get_type(acpi_device->handle, &type);
170         if (ACPI_FAILURE(status) || (!acpi_device->flags.ejectable)) {
171                 ret = -ENODEV;
172                 goto err;
173         }
174
175         acpi_os_hotplug_execute(acpi_bus_hot_remove_device, acpi_device->handle);
176 err:
177         return ret;
178 }
179
180 static DEVICE_ATTR(eject, 0200, NULL, acpi_eject_store);
181
182 static ssize_t
183 acpi_device_hid_show(struct device *dev, struct device_attribute *attr, char *buf) {
184         struct acpi_device *acpi_dev = to_acpi_device(dev);
185
186         return sprintf(buf, "%s\n", acpi_dev->pnp.hardware_id);
187 }
188 static DEVICE_ATTR(hid, 0444, acpi_device_hid_show, NULL);
189
190 static ssize_t
191 acpi_device_path_show(struct device *dev, struct device_attribute *attr, char *buf) {
192         struct acpi_device *acpi_dev = to_acpi_device(dev);
193         struct acpi_buffer path = {ACPI_ALLOCATE_BUFFER, NULL};
194         int result;
195
196         result = acpi_get_name(acpi_dev->handle, ACPI_FULL_PATHNAME, &path);
197         if (result)
198                 goto end;
199
200         result = sprintf(buf, "%s\n", (char*)path.pointer);
201         kfree(path.pointer);
202 end:
203         return result;
204 }
205 static DEVICE_ATTR(path, 0444, acpi_device_path_show, NULL);
206
207 static int acpi_device_setup_files(struct acpi_device *dev)
208 {
209         acpi_status status;
210         acpi_handle temp;
211         int result = 0;
212
213         /*
214          * Devices gotten from FADT don't have a "path" attribute
215          */
216         if (dev->handle) {
217                 result = device_create_file(&dev->dev, &dev_attr_path);
218                 if (result)
219                         goto end;
220         }
221
222         if (dev->flags.hardware_id) {
223                 result = device_create_file(&dev->dev, &dev_attr_hid);
224                 if (result)
225                         goto end;
226         }
227
228         if (dev->flags.hardware_id || dev->flags.compatible_ids) {
229                 result = device_create_file(&dev->dev, &dev_attr_modalias);
230                 if (result)
231                         goto end;
232         }
233
234         /*
235          * If device has _EJ0, 'eject' file is created that is used to trigger
236          * hot-removal function from userland.
237          */
238         status = acpi_get_handle(dev->handle, "_EJ0", &temp);
239         if (ACPI_SUCCESS(status))
240                 result = device_create_file(&dev->dev, &dev_attr_eject);
241 end:
242         return result;
243 }
244
245 static void acpi_device_remove_files(struct acpi_device *dev)
246 {
247         acpi_status status;
248         acpi_handle temp;
249
250         /*
251          * If device has _EJ0, 'eject' file is created that is used to trigger
252          * hot-removal function from userland.
253          */
254         status = acpi_get_handle(dev->handle, "_EJ0", &temp);
255         if (ACPI_SUCCESS(status))
256                 device_remove_file(&dev->dev, &dev_attr_eject);
257
258         if (dev->flags.hardware_id || dev->flags.compatible_ids)
259                 device_remove_file(&dev->dev, &dev_attr_modalias);
260
261         if (dev->flags.hardware_id)
262                 device_remove_file(&dev->dev, &dev_attr_hid);
263         if (dev->handle)
264                 device_remove_file(&dev->dev, &dev_attr_path);
265 }
266 /* --------------------------------------------------------------------------
267                         ACPI Bus operations
268    -------------------------------------------------------------------------- */
269
270 int acpi_match_device_ids(struct acpi_device *device,
271                           const struct acpi_device_id *ids)
272 {
273         const struct acpi_device_id *id;
274
275         /*
276          * If the device is not present, it is unnecessary to load device
277          * driver for it.
278          */
279         if (!device->status.present)
280                 return -ENODEV;
281
282         if (device->flags.hardware_id) {
283                 for (id = ids; id->id[0]; id++) {
284                         if (!strcmp((char*)id->id, device->pnp.hardware_id))
285                                 return 0;
286                 }
287         }
288
289         if (device->flags.compatible_ids) {
290                 struct acpica_device_id_list *cid_list = device->pnp.cid_list;
291                 int i;
292
293                 for (id = ids; id->id[0]; id++) {
294                         /* compare multiple _CID entries against driver ids */
295                         for (i = 0; i < cid_list->count; i++) {
296                                 if (!strcmp((char*)id->id,
297                                             cid_list->ids[i].string))
298                                         return 0;
299                         }
300                 }
301         }
302
303         return -ENOENT;
304 }
305 EXPORT_SYMBOL(acpi_match_device_ids);
306
307 static void acpi_device_release(struct device *dev)
308 {
309         struct acpi_device *acpi_dev = to_acpi_device(dev);
310
311         kfree(acpi_dev->pnp.cid_list);
312         if (acpi_dev->flags.hardware_id)
313                 kfree(acpi_dev->pnp.hardware_id);
314         if (acpi_dev->flags.unique_id)
315                 kfree(acpi_dev->pnp.unique_id);
316         kfree(acpi_dev);
317 }
318
319 static int acpi_device_suspend(struct device *dev, pm_message_t state)
320 {
321         struct acpi_device *acpi_dev = to_acpi_device(dev);
322         struct acpi_driver *acpi_drv = acpi_dev->driver;
323
324         if (acpi_drv && acpi_drv->ops.suspend)
325                 return acpi_drv->ops.suspend(acpi_dev, state);
326         return 0;
327 }
328
329 static int acpi_device_resume(struct device *dev)
330 {
331         struct acpi_device *acpi_dev = to_acpi_device(dev);
332         struct acpi_driver *acpi_drv = acpi_dev->driver;
333
334         if (acpi_drv && acpi_drv->ops.resume)
335                 return acpi_drv->ops.resume(acpi_dev);
336         return 0;
337 }
338
339 static int acpi_bus_match(struct device *dev, struct device_driver *drv)
340 {
341         struct acpi_device *acpi_dev = to_acpi_device(dev);
342         struct acpi_driver *acpi_drv = to_acpi_driver(drv);
343
344         return !acpi_match_device_ids(acpi_dev, acpi_drv->ids);
345 }
346
347 static int acpi_device_uevent(struct device *dev, struct kobj_uevent_env *env)
348 {
349         struct acpi_device *acpi_dev = to_acpi_device(dev);
350         int len;
351
352         if (add_uevent_var(env, "MODALIAS="))
353                 return -ENOMEM;
354         len = create_modalias(acpi_dev, &env->buf[env->buflen - 1],
355                               sizeof(env->buf) - env->buflen);
356         if (len >= (sizeof(env->buf) - env->buflen))
357                 return -ENOMEM;
358         env->buflen += len;
359         return 0;
360 }
361
362 static void acpi_device_notify(acpi_handle handle, u32 event, void *data)
363 {
364         struct acpi_device *device = data;
365
366         device->driver->ops.notify(device, event);
367 }
368
369 static acpi_status acpi_device_notify_fixed(void *data)
370 {
371         struct acpi_device *device = data;
372
373         acpi_device_notify(device->handle, ACPI_FIXED_HARDWARE_EVENT, device);
374         return AE_OK;
375 }
376
377 static int acpi_device_install_notify_handler(struct acpi_device *device)
378 {
379         acpi_status status;
380         char *hid;
381
382         hid = acpi_device_hid(device);
383         if (!strcmp(hid, ACPI_BUTTON_HID_POWERF))
384                 status =
385                     acpi_install_fixed_event_handler(ACPI_EVENT_POWER_BUTTON,
386                                                      acpi_device_notify_fixed,
387                                                      device);
388         else if (!strcmp(hid, ACPI_BUTTON_HID_SLEEPF))
389                 status =
390                     acpi_install_fixed_event_handler(ACPI_EVENT_SLEEP_BUTTON,
391                                                      acpi_device_notify_fixed,
392                                                      device);
393         else
394                 status = acpi_install_notify_handler(device->handle,
395                                                      ACPI_DEVICE_NOTIFY,
396                                                      acpi_device_notify,
397                                                      device);
398
399         if (ACPI_FAILURE(status))
400                 return -EINVAL;
401         return 0;
402 }
403
404 static void acpi_device_remove_notify_handler(struct acpi_device *device)
405 {
406         if (!strcmp(acpi_device_hid(device), ACPI_BUTTON_HID_POWERF))
407                 acpi_remove_fixed_event_handler(ACPI_EVENT_POWER_BUTTON,
408                                                 acpi_device_notify_fixed);
409         else if (!strcmp(acpi_device_hid(device), ACPI_BUTTON_HID_SLEEPF))
410                 acpi_remove_fixed_event_handler(ACPI_EVENT_SLEEP_BUTTON,
411                                                 acpi_device_notify_fixed);
412         else
413                 acpi_remove_notify_handler(device->handle, ACPI_DEVICE_NOTIFY,
414                                            acpi_device_notify);
415 }
416
417 static int acpi_bus_driver_init(struct acpi_device *, struct acpi_driver *);
418 static int acpi_start_single_object(struct acpi_device *);
419 static int acpi_device_probe(struct device * dev)
420 {
421         struct acpi_device *acpi_dev = to_acpi_device(dev);
422         struct acpi_driver *acpi_drv = to_acpi_driver(dev->driver);
423         int ret;
424
425         ret = acpi_bus_driver_init(acpi_dev, acpi_drv);
426         if (!ret) {
427                 if (acpi_dev->bus_ops.acpi_op_start)
428                         acpi_start_single_object(acpi_dev);
429
430                 if (acpi_drv->ops.notify) {
431                         ret = acpi_device_install_notify_handler(acpi_dev);
432                         if (ret) {
433                                 if (acpi_drv->ops.stop)
434                                         acpi_drv->ops.stop(acpi_dev,
435                                                    acpi_dev->removal_type);
436                                 if (acpi_drv->ops.remove)
437                                         acpi_drv->ops.remove(acpi_dev,
438                                                      acpi_dev->removal_type);
439                                 return ret;
440                         }
441                 }
442
443                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
444                         "Found driver [%s] for device [%s]\n",
445                         acpi_drv->name, acpi_dev->pnp.bus_id));
446                 get_device(dev);
447         }
448         return ret;
449 }
450
451 static int acpi_device_remove(struct device * dev)
452 {
453         struct acpi_device *acpi_dev = to_acpi_device(dev);
454         struct acpi_driver *acpi_drv = acpi_dev->driver;
455
456         if (acpi_drv) {
457                 if (acpi_drv->ops.notify)
458                         acpi_device_remove_notify_handler(acpi_dev);
459                 if (acpi_drv->ops.stop)
460                         acpi_drv->ops.stop(acpi_dev, acpi_dev->removal_type);
461                 if (acpi_drv->ops.remove)
462                         acpi_drv->ops.remove(acpi_dev, acpi_dev->removal_type);
463         }
464         acpi_dev->driver = NULL;
465         acpi_dev->driver_data = NULL;
466
467         put_device(dev);
468         return 0;
469 }
470
471 struct bus_type acpi_bus_type = {
472         .name           = "acpi",
473         .suspend        = acpi_device_suspend,
474         .resume         = acpi_device_resume,
475         .match          = acpi_bus_match,
476         .probe          = acpi_device_probe,
477         .remove         = acpi_device_remove,
478         .uevent         = acpi_device_uevent,
479 };
480
481 static int acpi_device_register(struct acpi_device *device,
482                                  struct acpi_device *parent)
483 {
484         int result;
485         struct acpi_device_bus_id *acpi_device_bus_id, *new_bus_id;
486         int found = 0;
487         /*
488          * Linkage
489          * -------
490          * Link this device to its parent and siblings.
491          */
492         INIT_LIST_HEAD(&device->children);
493         INIT_LIST_HEAD(&device->node);
494         INIT_LIST_HEAD(&device->wakeup_list);
495
496         new_bus_id = kzalloc(sizeof(struct acpi_device_bus_id), GFP_KERNEL);
497         if (!new_bus_id) {
498                 printk(KERN_ERR PREFIX "Memory allocation error\n");
499                 return -ENOMEM;
500         }
501
502         mutex_lock(&acpi_device_lock);
503         /*
504          * Find suitable bus_id and instance number in acpi_bus_id_list
505          * If failed, create one and link it into acpi_bus_id_list
506          */
507         list_for_each_entry(acpi_device_bus_id, &acpi_bus_id_list, node) {
508                 if(!strcmp(acpi_device_bus_id->bus_id, device->flags.hardware_id? device->pnp.hardware_id : "device")) {
509                         acpi_device_bus_id->instance_no ++;
510                         found = 1;
511                         kfree(new_bus_id);
512                         break;
513                 }
514         }
515         if (!found) {
516                 acpi_device_bus_id = new_bus_id;
517                 strcpy(acpi_device_bus_id->bus_id, device->flags.hardware_id ? device->pnp.hardware_id : "device");
518                 acpi_device_bus_id->instance_no = 0;
519                 list_add_tail(&acpi_device_bus_id->node, &acpi_bus_id_list);
520         }
521         dev_set_name(&device->dev, "%s:%02x", acpi_device_bus_id->bus_id, acpi_device_bus_id->instance_no);
522
523         if (device->parent)
524                 list_add_tail(&device->node, &device->parent->children);
525
526         if (device->wakeup.flags.valid)
527                 list_add_tail(&device->wakeup_list, &acpi_wakeup_device_list);
528         mutex_unlock(&acpi_device_lock);
529
530         if (device->parent)
531                 device->dev.parent = &parent->dev;
532         device->dev.bus = &acpi_bus_type;
533         device->dev.release = &acpi_device_release;
534         result = device_register(&device->dev);
535         if (result) {
536                 dev_err(&device->dev, "Error registering device\n");
537                 goto end;
538         }
539
540         result = acpi_device_setup_files(device);
541         if (result)
542                 printk(KERN_ERR PREFIX "Error creating sysfs interface for device %s\n",
543                        dev_name(&device->dev));
544
545         device->removal_type = ACPI_BUS_REMOVAL_NORMAL;
546         return 0;
547 end:
548         mutex_lock(&acpi_device_lock);
549         if (device->parent)
550                 list_del(&device->node);
551         list_del(&device->wakeup_list);
552         mutex_unlock(&acpi_device_lock);
553         return result;
554 }
555
556 static void acpi_device_unregister(struct acpi_device *device, int type)
557 {
558         mutex_lock(&acpi_device_lock);
559         if (device->parent)
560                 list_del(&device->node);
561
562         list_del(&device->wakeup_list);
563         mutex_unlock(&acpi_device_lock);
564
565         acpi_detach_data(device->handle, acpi_bus_data_handler);
566
567         acpi_device_remove_files(device);
568         device_unregister(&device->dev);
569 }
570
571 /* --------------------------------------------------------------------------
572                                  Driver Management
573    -------------------------------------------------------------------------- */
574 /**
575  * acpi_bus_driver_init - add a device to a driver
576  * @device: the device to add and initialize
577  * @driver: driver for the device
578  *
579  * Used to initialize a device via its device driver.  Called whenever a
580  * driver is bound to a device.  Invokes the driver's add() ops.
581  */
582 static int
583 acpi_bus_driver_init(struct acpi_device *device, struct acpi_driver *driver)
584 {
585         int result = 0;
586
587         if (!device || !driver)
588                 return -EINVAL;
589
590         if (!driver->ops.add)
591                 return -ENOSYS;
592
593         result = driver->ops.add(device);
594         if (result) {
595                 device->driver = NULL;
596                 device->driver_data = NULL;
597                 return result;
598         }
599
600         device->driver = driver;
601
602         /*
603          * TBD - Configuration Management: Assign resources to device based
604          * upon possible configuration and currently allocated resources.
605          */
606
607         ACPI_DEBUG_PRINT((ACPI_DB_INFO,
608                           "Driver successfully bound to device\n"));
609         return 0;
610 }
611
612 static int acpi_start_single_object(struct acpi_device *device)
613 {
614         int result = 0;
615         struct acpi_driver *driver;
616
617
618         if (!(driver = device->driver))
619                 return 0;
620
621         if (driver->ops.start) {
622                 result = driver->ops.start(device);
623                 if (result && driver->ops.remove)
624                         driver->ops.remove(device, ACPI_BUS_REMOVAL_NORMAL);
625         }
626
627         return result;
628 }
629
630 /**
631  * acpi_bus_register_driver - register a driver with the ACPI bus
632  * @driver: driver being registered
633  *
634  * Registers a driver with the ACPI bus.  Searches the namespace for all
635  * devices that match the driver's criteria and binds.  Returns zero for
636  * success or a negative error status for failure.
637  */
638 int acpi_bus_register_driver(struct acpi_driver *driver)
639 {
640         int ret;
641
642         if (acpi_disabled)
643                 return -ENODEV;
644         driver->drv.name = driver->name;
645         driver->drv.bus = &acpi_bus_type;
646         driver->drv.owner = driver->owner;
647
648         ret = driver_register(&driver->drv);
649         return ret;
650 }
651
652 EXPORT_SYMBOL(acpi_bus_register_driver);
653
654 /**
655  * acpi_bus_unregister_driver - unregisters a driver with the APIC bus
656  * @driver: driver to unregister
657  *
658  * Unregisters a driver with the ACPI bus.  Searches the namespace for all
659  * devices that match the driver's criteria and unbinds.
660  */
661 void acpi_bus_unregister_driver(struct acpi_driver *driver)
662 {
663         driver_unregister(&driver->drv);
664 }
665
666 EXPORT_SYMBOL(acpi_bus_unregister_driver);
667
668 /* --------------------------------------------------------------------------
669                                  Device Enumeration
670    -------------------------------------------------------------------------- */
671 acpi_status
672 acpi_bus_get_ejd(acpi_handle handle, acpi_handle *ejd)
673 {
674         acpi_status status;
675         acpi_handle tmp;
676         struct acpi_buffer buffer = {ACPI_ALLOCATE_BUFFER, NULL};
677         union acpi_object *obj;
678
679         status = acpi_get_handle(handle, "_EJD", &tmp);
680         if (ACPI_FAILURE(status))
681                 return status;
682
683         status = acpi_evaluate_object(handle, "_EJD", NULL, &buffer);
684         if (ACPI_SUCCESS(status)) {
685                 obj = buffer.pointer;
686                 status = acpi_get_handle(ACPI_ROOT_OBJECT, obj->string.pointer,
687                                          ejd);
688                 kfree(buffer.pointer);
689         }
690         return status;
691 }
692 EXPORT_SYMBOL_GPL(acpi_bus_get_ejd);
693
694 void acpi_bus_data_handler(acpi_handle handle, void *context)
695 {
696
697         /* TBD */
698
699         return;
700 }
701
702 static int acpi_bus_get_perf_flags(struct acpi_device *device)
703 {
704         device->performance.state = ACPI_STATE_UNKNOWN;
705         return 0;
706 }
707
708 static acpi_status
709 acpi_bus_extract_wakeup_device_power_package(struct acpi_device *device,
710                                              union acpi_object *package)
711 {
712         int i = 0;
713         union acpi_object *element = NULL;
714
715         if (!device || !package || (package->package.count < 2))
716                 return AE_BAD_PARAMETER;
717
718         element = &(package->package.elements[0]);
719         if (!element)
720                 return AE_BAD_PARAMETER;
721         if (element->type == ACPI_TYPE_PACKAGE) {
722                 if ((element->package.count < 2) ||
723                     (element->package.elements[0].type !=
724                      ACPI_TYPE_LOCAL_REFERENCE)
725                     || (element->package.elements[1].type != ACPI_TYPE_INTEGER))
726                         return AE_BAD_DATA;
727                 device->wakeup.gpe_device =
728                     element->package.elements[0].reference.handle;
729                 device->wakeup.gpe_number =
730                     (u32) element->package.elements[1].integer.value;
731         } else if (element->type == ACPI_TYPE_INTEGER) {
732                 device->wakeup.gpe_number = element->integer.value;
733         } else
734                 return AE_BAD_DATA;
735
736         element = &(package->package.elements[1]);
737         if (element->type != ACPI_TYPE_INTEGER) {
738                 return AE_BAD_DATA;
739         }
740         device->wakeup.sleep_state = element->integer.value;
741
742         if ((package->package.count - 2) > ACPI_MAX_HANDLES) {
743                 return AE_NO_MEMORY;
744         }
745         device->wakeup.resources.count = package->package.count - 2;
746         for (i = 0; i < device->wakeup.resources.count; i++) {
747                 element = &(package->package.elements[i + 2]);
748                 if (element->type != ACPI_TYPE_LOCAL_REFERENCE)
749                         return AE_BAD_DATA;
750
751                 device->wakeup.resources.handles[i] = element->reference.handle;
752         }
753
754         return AE_OK;
755 }
756
757 static int acpi_bus_get_wakeup_device_flags(struct acpi_device *device)
758 {
759         acpi_status status = 0;
760         struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
761         union acpi_object *package = NULL;
762         int psw_error;
763
764         struct acpi_device_id button_device_ids[] = {
765                 {"PNP0C0D", 0},
766                 {"PNP0C0C", 0},
767                 {"PNP0C0E", 0},
768                 {"", 0},
769         };
770
771         /* _PRW */
772         status = acpi_evaluate_object(device->handle, "_PRW", NULL, &buffer);
773         if (ACPI_FAILURE(status)) {
774                 ACPI_EXCEPTION((AE_INFO, status, "Evaluating _PRW"));
775                 goto end;
776         }
777
778         package = (union acpi_object *)buffer.pointer;
779         status = acpi_bus_extract_wakeup_device_power_package(device, package);
780         if (ACPI_FAILURE(status)) {
781                 ACPI_EXCEPTION((AE_INFO, status, "Extracting _PRW package"));
782                 goto end;
783         }
784
785         kfree(buffer.pointer);
786
787         device->wakeup.flags.valid = 1;
788         device->wakeup.prepare_count = 0;
789         /* Call _PSW/_DSW object to disable its ability to wake the sleeping
790          * system for the ACPI device with the _PRW object.
791          * The _PSW object is depreciated in ACPI 3.0 and is replaced by _DSW.
792          * So it is necessary to call _DSW object first. Only when it is not
793          * present will the _PSW object used.
794          */
795         psw_error = acpi_device_sleep_wake(device, 0, 0, 0);
796         if (psw_error)
797                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
798                                 "error in _DSW or _PSW evaluation\n"));
799
800         /* Power button, Lid switch always enable wakeup */
801         if (!acpi_match_device_ids(device, button_device_ids))
802                 device->wakeup.flags.run_wake = 1;
803
804 end:
805         if (ACPI_FAILURE(status))
806                 device->flags.wake_capable = 0;
807         return 0;
808 }
809
810 static int acpi_bus_get_power_flags(struct acpi_device *device)
811 {
812         acpi_status status = 0;
813         acpi_handle handle = NULL;
814         u32 i = 0;
815
816
817         /*
818          * Power Management Flags
819          */
820         status = acpi_get_handle(device->handle, "_PSC", &handle);
821         if (ACPI_SUCCESS(status))
822                 device->power.flags.explicit_get = 1;
823         status = acpi_get_handle(device->handle, "_IRC", &handle);
824         if (ACPI_SUCCESS(status))
825                 device->power.flags.inrush_current = 1;
826
827         /*
828          * Enumerate supported power management states
829          */
830         for (i = ACPI_STATE_D0; i <= ACPI_STATE_D3; i++) {
831                 struct acpi_device_power_state *ps = &device->power.states[i];
832                 char object_name[5] = { '_', 'P', 'R', '0' + i, '\0' };
833
834                 /* Evaluate "_PRx" to se if power resources are referenced */
835                 acpi_evaluate_reference(device->handle, object_name, NULL,
836                                         &ps->resources);
837                 if (ps->resources.count) {
838                         device->power.flags.power_resources = 1;
839                         ps->flags.valid = 1;
840                 }
841
842                 /* Evaluate "_PSx" to see if we can do explicit sets */
843                 object_name[2] = 'S';
844                 status = acpi_get_handle(device->handle, object_name, &handle);
845                 if (ACPI_SUCCESS(status)) {
846                         ps->flags.explicit_set = 1;
847                         ps->flags.valid = 1;
848                 }
849
850                 /* State is valid if we have some power control */
851                 if (ps->resources.count || ps->flags.explicit_set)
852                         ps->flags.valid = 1;
853
854                 ps->power = -1; /* Unknown - driver assigned */
855                 ps->latency = -1;       /* Unknown - driver assigned */
856         }
857
858         /* Set defaults for D0 and D3 states (always valid) */
859         device->power.states[ACPI_STATE_D0].flags.valid = 1;
860         device->power.states[ACPI_STATE_D0].power = 100;
861         device->power.states[ACPI_STATE_D3].flags.valid = 1;
862         device->power.states[ACPI_STATE_D3].power = 0;
863
864         /* TBD: System wake support and resource requirements. */
865
866         device->power.state = ACPI_STATE_UNKNOWN;
867         acpi_bus_get_power(device->handle, &(device->power.state));
868
869         return 0;
870 }
871
872 static int acpi_bus_get_flags(struct acpi_device *device)
873 {
874         acpi_status status = AE_OK;
875         acpi_handle temp = NULL;
876
877
878         /* Presence of _STA indicates 'dynamic_status' */
879         status = acpi_get_handle(device->handle, "_STA", &temp);
880         if (ACPI_SUCCESS(status))
881                 device->flags.dynamic_status = 1;
882
883         /* Presence of _CID indicates 'compatible_ids' */
884         status = acpi_get_handle(device->handle, "_CID", &temp);
885         if (ACPI_SUCCESS(status))
886                 device->flags.compatible_ids = 1;
887
888         /* Presence of _RMV indicates 'removable' */
889         status = acpi_get_handle(device->handle, "_RMV", &temp);
890         if (ACPI_SUCCESS(status))
891                 device->flags.removable = 1;
892
893         /* Presence of _EJD|_EJ0 indicates 'ejectable' */
894         status = acpi_get_handle(device->handle, "_EJD", &temp);
895         if (ACPI_SUCCESS(status))
896                 device->flags.ejectable = 1;
897         else {
898                 status = acpi_get_handle(device->handle, "_EJ0", &temp);
899                 if (ACPI_SUCCESS(status))
900                         device->flags.ejectable = 1;
901         }
902
903         /* Presence of _LCK indicates 'lockable' */
904         status = acpi_get_handle(device->handle, "_LCK", &temp);
905         if (ACPI_SUCCESS(status))
906                 device->flags.lockable = 1;
907
908         /* Presence of _PS0|_PR0 indicates 'power manageable' */
909         status = acpi_get_handle(device->handle, "_PS0", &temp);
910         if (ACPI_FAILURE(status))
911                 status = acpi_get_handle(device->handle, "_PR0", &temp);
912         if (ACPI_SUCCESS(status))
913                 device->flags.power_manageable = 1;
914
915         /* Presence of _PRW indicates wake capable */
916         status = acpi_get_handle(device->handle, "_PRW", &temp);
917         if (ACPI_SUCCESS(status))
918                 device->flags.wake_capable = 1;
919
920         /* TBD: Performance management */
921
922         return 0;
923 }
924
925 static void acpi_device_get_busid(struct acpi_device *device,
926                                   acpi_handle handle, int type)
927 {
928         char bus_id[5] = { '?', 0 };
929         struct acpi_buffer buffer = { sizeof(bus_id), bus_id };
930         int i = 0;
931
932         /*
933          * Bus ID
934          * ------
935          * The device's Bus ID is simply the object name.
936          * TBD: Shouldn't this value be unique (within the ACPI namespace)?
937          */
938         switch (type) {
939         case ACPI_BUS_TYPE_SYSTEM:
940                 strcpy(device->pnp.bus_id, "ACPI");
941                 break;
942         case ACPI_BUS_TYPE_POWER_BUTTON:
943                 strcpy(device->pnp.bus_id, "PWRF");
944                 break;
945         case ACPI_BUS_TYPE_SLEEP_BUTTON:
946                 strcpy(device->pnp.bus_id, "SLPF");
947                 break;
948         default:
949                 acpi_get_name(handle, ACPI_SINGLE_NAME, &buffer);
950                 /* Clean up trailing underscores (if any) */
951                 for (i = 3; i > 1; i--) {
952                         if (bus_id[i] == '_')
953                                 bus_id[i] = '\0';
954                         else
955                                 break;
956                 }
957                 strcpy(device->pnp.bus_id, bus_id);
958                 break;
959         }
960 }
961
962 /*
963  * acpi_bay_match - see if a device is an ejectable driver bay
964  *
965  * If an acpi object is ejectable and has one of the ACPI ATA methods defined,
966  * then we can safely call it an ejectable drive bay
967  */
968 static int acpi_bay_match(struct acpi_device *device){
969         acpi_status status;
970         acpi_handle handle;
971         acpi_handle tmp;
972         acpi_handle phandle;
973
974         handle = device->handle;
975
976         status = acpi_get_handle(handle, "_EJ0", &tmp);
977         if (ACPI_FAILURE(status))
978                 return -ENODEV;
979
980         if ((ACPI_SUCCESS(acpi_get_handle(handle, "_GTF", &tmp))) ||
981                 (ACPI_SUCCESS(acpi_get_handle(handle, "_GTM", &tmp))) ||
982                 (ACPI_SUCCESS(acpi_get_handle(handle, "_STM", &tmp))) ||
983                 (ACPI_SUCCESS(acpi_get_handle(handle, "_SDD", &tmp))))
984                 return 0;
985
986         if (acpi_get_parent(handle, &phandle))
987                 return -ENODEV;
988
989         if ((ACPI_SUCCESS(acpi_get_handle(phandle, "_GTF", &tmp))) ||
990                 (ACPI_SUCCESS(acpi_get_handle(phandle, "_GTM", &tmp))) ||
991                 (ACPI_SUCCESS(acpi_get_handle(phandle, "_STM", &tmp))) ||
992                 (ACPI_SUCCESS(acpi_get_handle(phandle, "_SDD", &tmp))))
993                 return 0;
994
995         return -ENODEV;
996 }
997
998 /*
999  * acpi_dock_match - see if a device has a _DCK method
1000  */
1001 static int acpi_dock_match(struct acpi_device *device)
1002 {
1003         acpi_handle tmp;
1004         return acpi_get_handle(device->handle, "_DCK", &tmp);
1005 }
1006
1007 static struct acpica_device_id_list*
1008 acpi_add_cid(
1009         struct acpi_device_info         *info,
1010         struct acpica_device_id         *new_cid)
1011 {
1012         struct acpica_device_id_list    *cid;
1013         char                            *next_id_string;
1014         acpi_size                       cid_length;
1015         acpi_size                       new_cid_length;
1016         u32                             i;
1017
1018
1019         /* Allocate new CID list with room for the new CID */
1020
1021         if (!new_cid)
1022                 new_cid_length = info->compatible_id_list.list_size;
1023         else if (info->compatible_id_list.list_size)
1024                 new_cid_length = info->compatible_id_list.list_size +
1025                         new_cid->length + sizeof(struct acpica_device_id);
1026         else
1027                 new_cid_length = sizeof(struct acpica_device_id_list) + new_cid->length;
1028
1029         cid = ACPI_ALLOCATE_ZEROED(new_cid_length);
1030         if (!cid) {
1031                 return NULL;
1032         }
1033
1034         cid->list_size = new_cid_length;
1035         cid->count = info->compatible_id_list.count;
1036         if (new_cid)
1037                 cid->count++;
1038         next_id_string = (char *) cid->ids + (cid->count * sizeof(struct acpica_device_id));
1039
1040         /* Copy all existing CIDs */
1041
1042         for (i = 0; i < info->compatible_id_list.count; i++) {
1043                 cid_length = info->compatible_id_list.ids[i].length;
1044                 cid->ids[i].string = next_id_string;
1045                 cid->ids[i].length = cid_length;
1046
1047                 ACPI_MEMCPY(next_id_string, info->compatible_id_list.ids[i].string,
1048                         cid_length);
1049
1050                 next_id_string += cid_length;
1051         }
1052
1053         /* Append the new CID */
1054
1055         if (new_cid) {
1056                 cid->ids[i].string = next_id_string;
1057                 cid->ids[i].length = new_cid->length;
1058
1059                 ACPI_MEMCPY(next_id_string, new_cid->string, new_cid->length);
1060         }
1061
1062         return cid;
1063 }
1064
1065 static void acpi_device_set_id(struct acpi_device *device,
1066                                struct acpi_device *parent, acpi_handle handle,
1067                                int type)
1068 {
1069         struct acpi_device_info *info = NULL;
1070         char *hid = NULL;
1071         char *uid = NULL;
1072         struct acpica_device_id_list *cid_list = NULL;
1073         char *cid_add = NULL;
1074         acpi_status status;
1075
1076         switch (type) {
1077         case ACPI_BUS_TYPE_DEVICE:
1078                 status = acpi_get_object_info(handle, &info);
1079                 if (ACPI_FAILURE(status)) {
1080                         printk(KERN_ERR PREFIX "%s: Error reading device info\n", __func__);
1081                         return;
1082                 }
1083
1084                 if (info->valid & ACPI_VALID_HID)
1085                         hid = info->hardware_id.string;
1086                 if (info->valid & ACPI_VALID_UID)
1087                         uid = info->unique_id.string;
1088                 if (info->valid & ACPI_VALID_CID)
1089                         cid_list = &info->compatible_id_list;
1090                 if (info->valid & ACPI_VALID_ADR) {
1091                         device->pnp.bus_address = info->address;
1092                         device->flags.bus_address = 1;
1093                 }
1094
1095                 /* If we have a video/bay/dock device, add our selfdefined
1096                    HID to the CID list. Like that the video/bay/dock drivers
1097                    will get autoloaded and the device might still match
1098                    against another driver.
1099                 */
1100                 if (acpi_is_video_device(device))
1101                         cid_add = ACPI_VIDEO_HID;
1102                 else if (ACPI_SUCCESS(acpi_bay_match(device)))
1103                         cid_add = ACPI_BAY_HID;
1104                 else if (ACPI_SUCCESS(acpi_dock_match(device)))
1105                         cid_add = ACPI_DOCK_HID;
1106
1107                 break;
1108         case ACPI_BUS_TYPE_POWER:
1109                 hid = ACPI_POWER_HID;
1110                 break;
1111         case ACPI_BUS_TYPE_PROCESSOR:
1112                 hid = ACPI_PROCESSOR_OBJECT_HID;
1113                 break;
1114         case ACPI_BUS_TYPE_SYSTEM:
1115                 hid = ACPI_SYSTEM_HID;
1116                 break;
1117         case ACPI_BUS_TYPE_THERMAL:
1118                 hid = ACPI_THERMAL_HID;
1119                 break;
1120         case ACPI_BUS_TYPE_POWER_BUTTON:
1121                 hid = ACPI_BUTTON_HID_POWERF;
1122                 break;
1123         case ACPI_BUS_TYPE_SLEEP_BUTTON:
1124                 hid = ACPI_BUTTON_HID_SLEEPF;
1125                 break;
1126         }
1127
1128         /*
1129          * \_SB
1130          * ----
1131          * Fix for the system root bus device -- the only root-level device.
1132          */
1133         if (((acpi_handle)parent == ACPI_ROOT_OBJECT) && (type == ACPI_BUS_TYPE_DEVICE)) {
1134                 hid = ACPI_BUS_HID;
1135                 strcpy(device->pnp.device_name, ACPI_BUS_DEVICE_NAME);
1136                 strcpy(device->pnp.device_class, ACPI_BUS_CLASS);
1137         }
1138
1139         if (hid) {
1140                 device->pnp.hardware_id = ACPI_ALLOCATE_ZEROED(strlen (hid) + 1);
1141                 if (device->pnp.hardware_id) {
1142                         strcpy(device->pnp.hardware_id, hid);
1143                         device->flags.hardware_id = 1;
1144                 }
1145         }
1146         if (!device->flags.hardware_id)
1147                 device->pnp.hardware_id = "";
1148
1149         if (uid) {
1150                 device->pnp.unique_id = ACPI_ALLOCATE_ZEROED(strlen (uid) + 1);
1151                 if (device->pnp.unique_id) {
1152                         strcpy(device->pnp.unique_id, uid);
1153                         device->flags.unique_id = 1;
1154                 }
1155         }
1156         if (!device->flags.unique_id)
1157                 device->pnp.unique_id = "";
1158
1159         if (cid_list || cid_add) {
1160                 struct acpica_device_id_list *list;
1161
1162                 if (cid_add) {
1163                         struct acpica_device_id cid;
1164                         cid.length = strlen (cid_add) + 1;
1165                         cid.string = cid_add;
1166
1167                         list = acpi_add_cid(info, &cid);
1168                 } else {
1169                         list = acpi_add_cid(info, NULL);
1170                 }
1171
1172                 if (list) {
1173                         device->pnp.cid_list = list;
1174                         if (cid_add)
1175                                 device->flags.compatible_ids = 1;
1176                 }
1177         }
1178
1179         kfree(info);
1180 }
1181
1182 static int acpi_device_set_context(struct acpi_device *device, int type)
1183 {
1184         acpi_status status = AE_OK;
1185         int result = 0;
1186         /*
1187          * Context
1188          * -------
1189          * Attach this 'struct acpi_device' to the ACPI object.  This makes
1190          * resolutions from handle->device very efficient.  Note that we need
1191          * to be careful with fixed-feature devices as they all attach to the
1192          * root object.
1193          */
1194         if (type != ACPI_BUS_TYPE_POWER_BUTTON &&
1195             type != ACPI_BUS_TYPE_SLEEP_BUTTON) {
1196                 status = acpi_attach_data(device->handle,
1197                                           acpi_bus_data_handler, device);
1198
1199                 if (ACPI_FAILURE(status)) {
1200                         printk(KERN_ERR PREFIX "Error attaching device data\n");
1201                         result = -ENODEV;
1202                 }
1203         }
1204         return result;
1205 }
1206
1207 static int acpi_bus_remove(struct acpi_device *dev, int rmdevice)
1208 {
1209         if (!dev)
1210                 return -EINVAL;
1211
1212         dev->removal_type = ACPI_BUS_REMOVAL_EJECT;
1213         device_release_driver(&dev->dev);
1214
1215         if (!rmdevice)
1216                 return 0;
1217
1218         /*
1219          * unbind _ADR-Based Devices when hot removal
1220          */
1221         if (dev->flags.bus_address) {
1222                 if ((dev->parent) && (dev->parent->ops.unbind))
1223                         dev->parent->ops.unbind(dev);
1224         }
1225         acpi_device_unregister(dev, ACPI_BUS_REMOVAL_EJECT);
1226
1227         return 0;
1228 }
1229
1230 static int
1231 acpi_add_single_object(struct acpi_device **child,
1232                        struct acpi_device *parent, acpi_handle handle, int type,
1233                         struct acpi_bus_ops *ops)
1234 {
1235         int result = 0;
1236         struct acpi_device *device = NULL;
1237
1238
1239         if (!child)
1240                 return -EINVAL;
1241
1242         device = kzalloc(sizeof(struct acpi_device), GFP_KERNEL);
1243         if (!device) {
1244                 printk(KERN_ERR PREFIX "Memory allocation error\n");
1245                 return -ENOMEM;
1246         }
1247
1248         device->handle = handle;
1249         device->parent = parent;
1250         device->bus_ops = *ops; /* workround for not call .start */
1251
1252
1253         acpi_device_get_busid(device, handle, type);
1254
1255         /*
1256          * Flags
1257          * -----
1258          * Get prior to calling acpi_bus_get_status() so we know whether
1259          * or not _STA is present.  Note that we only look for object
1260          * handles -- cannot evaluate objects until we know the device is
1261          * present and properly initialized.
1262          */
1263         result = acpi_bus_get_flags(device);
1264         if (result)
1265                 goto end;
1266
1267         /*
1268          * Status
1269          * ------
1270          * See if the device is present.  We always assume that non-Device
1271          * and non-Processor objects (e.g. thermal zones, power resources,
1272          * etc.) are present, functioning, etc. (at least when parent object
1273          * is present).  Note that _STA has a different meaning for some
1274          * objects (e.g. power resources) so we need to be careful how we use
1275          * it.
1276          */
1277         switch (type) {
1278         case ACPI_BUS_TYPE_PROCESSOR:
1279         case ACPI_BUS_TYPE_DEVICE:
1280                 result = acpi_bus_get_status(device);
1281                 if (ACPI_FAILURE(result)) {
1282                         result = -ENODEV;
1283                         goto end;
1284                 }
1285                 /*
1286                  * When the device is neither present nor functional, the
1287                  * device should not be added to Linux ACPI device tree.
1288                  * When the status of the device is not present but functinal,
1289                  * it should be added to Linux ACPI tree. For example : bay
1290                  * device , dock device.
1291                  * In such conditions it is unncessary to check whether it is
1292                  * bay device or dock device.
1293                  */
1294                 if (!device->status.present && !device->status.functional) {
1295                         result = -ENODEV;
1296                         goto end;
1297                 }
1298                 break;
1299         default:
1300                 STRUCT_TO_INT(device->status) =
1301                     ACPI_STA_DEVICE_PRESENT | ACPI_STA_DEVICE_ENABLED |
1302                     ACPI_STA_DEVICE_UI      | ACPI_STA_DEVICE_FUNCTIONING;
1303                 break;
1304         }
1305
1306         /*
1307          * Initialize Device
1308          * -----------------
1309          * TBD: Synch with Core's enumeration/initialization process.
1310          */
1311
1312         /*
1313          * Hardware ID, Unique ID, & Bus Address
1314          * -------------------------------------
1315          */
1316         acpi_device_set_id(device, parent, handle, type);
1317
1318         /*
1319          * Power Management
1320          * ----------------
1321          */
1322         if (device->flags.power_manageable) {
1323                 result = acpi_bus_get_power_flags(device);
1324                 if (result)
1325                         goto end;
1326         }
1327
1328         /*
1329          * Wakeup device management
1330          *-----------------------
1331          */
1332         if (device->flags.wake_capable) {
1333                 result = acpi_bus_get_wakeup_device_flags(device);
1334                 if (result)
1335                         goto end;
1336         }
1337
1338         /*
1339          * Performance Management
1340          * ----------------------
1341          */
1342         if (device->flags.performance_manageable) {
1343                 result = acpi_bus_get_perf_flags(device);
1344                 if (result)
1345                         goto end;
1346         }
1347
1348         if ((result = acpi_device_set_context(device, type)))
1349                 goto end;
1350
1351         result = acpi_device_register(device, parent);
1352
1353         /*
1354          * Bind _ADR-Based Devices when hot add
1355          */
1356         if (device->flags.bus_address) {
1357                 if (device->parent && device->parent->ops.bind)
1358                         device->parent->ops.bind(device);
1359         }
1360
1361 end:
1362         if (!result)
1363                 *child = device;
1364         else
1365                 acpi_device_release(&device->dev);
1366
1367         return result;
1368 }
1369
1370 static int acpi_bus_scan(struct acpi_device *start, struct acpi_bus_ops *ops)
1371 {
1372         acpi_status status = AE_OK;
1373         struct acpi_device *parent = NULL;
1374         struct acpi_device *child = NULL;
1375         acpi_handle phandle = NULL;
1376         acpi_handle chandle = NULL;
1377         acpi_object_type type = 0;
1378         u32 level = 1;
1379
1380
1381         if (!start)
1382                 return -EINVAL;
1383
1384         parent = start;
1385         phandle = start->handle;
1386
1387         /*
1388          * Parse through the ACPI namespace, identify all 'devices', and
1389          * create a new 'struct acpi_device' for each.
1390          */
1391         while ((level > 0) && parent) {
1392
1393                 status = acpi_get_next_object(ACPI_TYPE_ANY, phandle,
1394                                               chandle, &chandle);
1395
1396                 /*
1397                  * If this scope is exhausted then move our way back up.
1398                  */
1399                 if (ACPI_FAILURE(status)) {
1400                         level--;
1401                         chandle = phandle;
1402                         acpi_get_parent(phandle, &phandle);
1403                         if (parent->parent)
1404                                 parent = parent->parent;
1405                         continue;
1406                 }
1407
1408                 status = acpi_get_type(chandle, &type);
1409                 if (ACPI_FAILURE(status))
1410                         continue;
1411
1412                 /*
1413                  * If this is a scope object then parse it (depth-first).
1414                  */
1415                 if (type == ACPI_TYPE_LOCAL_SCOPE) {
1416                         level++;
1417                         phandle = chandle;
1418                         chandle = NULL;
1419                         continue;
1420                 }
1421
1422                 /*
1423                  * We're only interested in objects that we consider 'devices'.
1424                  */
1425                 switch (type) {
1426                 case ACPI_TYPE_DEVICE:
1427                         type = ACPI_BUS_TYPE_DEVICE;
1428                         break;
1429                 case ACPI_TYPE_PROCESSOR:
1430                         type = ACPI_BUS_TYPE_PROCESSOR;
1431                         break;
1432                 case ACPI_TYPE_THERMAL:
1433                         type = ACPI_BUS_TYPE_THERMAL;
1434                         break;
1435                 case ACPI_TYPE_POWER:
1436                         type = ACPI_BUS_TYPE_POWER;
1437                         break;
1438                 default:
1439                         continue;
1440                 }
1441
1442                 if (ops->acpi_op_add)
1443                         status = acpi_add_single_object(&child, parent,
1444                                 chandle, type, ops);
1445                 else
1446                         status = acpi_bus_get_device(chandle, &child);
1447
1448                 if (ACPI_FAILURE(status))
1449                         continue;
1450
1451                 if (ops->acpi_op_start && !(ops->acpi_op_add)) {
1452                         status = acpi_start_single_object(child);
1453                         if (ACPI_FAILURE(status))
1454                                 continue;
1455                 }
1456
1457                 /*
1458                  * If the device is present, enabled, and functioning then
1459                  * parse its scope (depth-first).  Note that we need to
1460                  * represent absent devices to facilitate PnP notifications
1461                  * -- but only the subtree head (not all of its children,
1462                  * which will be enumerated when the parent is inserted).
1463                  *
1464                  * TBD: Need notifications and other detection mechanisms
1465                  *      in place before we can fully implement this.
1466                  */
1467                  /*
1468                  * When the device is not present but functional, it is also
1469                  * necessary to scan the children of this device.
1470                  */
1471                 if (child->status.present || (!child->status.present &&
1472                                         child->status.functional)) {
1473                         status = acpi_get_next_object(ACPI_TYPE_ANY, chandle,
1474                                                       NULL, NULL);
1475                         if (ACPI_SUCCESS(status)) {
1476                                 level++;
1477                                 phandle = chandle;
1478                                 chandle = NULL;
1479                                 parent = child;
1480                         }
1481                 }
1482         }
1483
1484         return 0;
1485 }
1486
1487 int
1488 acpi_bus_add(struct acpi_device **child,
1489              struct acpi_device *parent, acpi_handle handle, int type)
1490 {
1491         int result;
1492         struct acpi_bus_ops ops;
1493
1494         memset(&ops, 0, sizeof(ops));
1495         ops.acpi_op_add = 1;
1496
1497         result = acpi_add_single_object(child, parent, handle, type, &ops);
1498         if (!result)
1499                 result = acpi_bus_scan(*child, &ops);
1500
1501         return result;
1502 }
1503 EXPORT_SYMBOL(acpi_bus_add);
1504
1505 int acpi_bus_start(struct acpi_device *device)
1506 {
1507         int result;
1508         struct acpi_bus_ops ops;
1509
1510
1511         if (!device)
1512                 return -EINVAL;
1513
1514         result = acpi_start_single_object(device);
1515         if (!result) {
1516                 memset(&ops, 0, sizeof(ops));
1517                 ops.acpi_op_start = 1;
1518                 result = acpi_bus_scan(device, &ops);
1519         }
1520         return result;
1521 }
1522 EXPORT_SYMBOL(acpi_bus_start);
1523
1524 int acpi_bus_trim(struct acpi_device *start, int rmdevice)
1525 {
1526         acpi_status status;
1527         struct acpi_device *parent, *child;
1528         acpi_handle phandle, chandle;
1529         acpi_object_type type;
1530         u32 level = 1;
1531         int err = 0;
1532
1533         parent = start;
1534         phandle = start->handle;
1535         child = chandle = NULL;
1536
1537         while ((level > 0) && parent && (!err)) {
1538                 status = acpi_get_next_object(ACPI_TYPE_ANY, phandle,
1539                                               chandle, &chandle);
1540
1541                 /*
1542                  * If this scope is exhausted then move our way back up.
1543                  */
1544                 if (ACPI_FAILURE(status)) {
1545                         level--;
1546                         chandle = phandle;
1547                         acpi_get_parent(phandle, &phandle);
1548                         child = parent;
1549                         parent = parent->parent;
1550
1551                         if (level == 0)
1552                                 err = acpi_bus_remove(child, rmdevice);
1553                         else
1554                                 err = acpi_bus_remove(child, 1);
1555
1556                         continue;
1557                 }
1558
1559                 status = acpi_get_type(chandle, &type);
1560                 if (ACPI_FAILURE(status)) {
1561                         continue;
1562                 }
1563                 /*
1564                  * If there is a device corresponding to chandle then
1565                  * parse it (depth-first).
1566                  */
1567                 if (acpi_bus_get_device(chandle, &child) == 0) {
1568                         level++;
1569                         phandle = chandle;
1570                         chandle = NULL;
1571                         parent = child;
1572                 }
1573                 continue;
1574         }
1575         return err;
1576 }
1577 EXPORT_SYMBOL_GPL(acpi_bus_trim);
1578
1579 static int acpi_bus_scan_fixed(struct acpi_device *root)
1580 {
1581         int result = 0;
1582         struct acpi_device *device = NULL;
1583         struct acpi_bus_ops ops;
1584
1585         if (!root)
1586                 return -ENODEV;
1587
1588         memset(&ops, 0, sizeof(ops));
1589         ops.acpi_op_add = 1;
1590         ops.acpi_op_start = 1;
1591
1592         /*
1593          * Enumerate all fixed-feature devices.
1594          */
1595         if ((acpi_gbl_FADT.flags & ACPI_FADT_POWER_BUTTON) == 0) {
1596                 result = acpi_add_single_object(&device, acpi_root,
1597                                                 NULL,
1598                                                 ACPI_BUS_TYPE_POWER_BUTTON,
1599                                                 &ops);
1600         }
1601
1602         if ((acpi_gbl_FADT.flags & ACPI_FADT_SLEEP_BUTTON) == 0) {
1603                 result = acpi_add_single_object(&device, acpi_root,
1604                                                 NULL,
1605                                                 ACPI_BUS_TYPE_SLEEP_BUTTON,
1606                                                 &ops);
1607         }
1608
1609         return result;
1610 }
1611
1612 int __init acpi_scan_init(void)
1613 {
1614         int result;
1615         struct acpi_bus_ops ops;
1616
1617         memset(&ops, 0, sizeof(ops));
1618         ops.acpi_op_add = 1;
1619         ops.acpi_op_start = 1;
1620
1621         result = bus_register(&acpi_bus_type);
1622         if (result) {
1623                 /* We don't want to quit even if we failed to add suspend/resume */
1624                 printk(KERN_ERR PREFIX "Could not register bus type\n");
1625         }
1626
1627         /*
1628          * Create the root device in the bus's device tree
1629          */
1630         result = acpi_add_single_object(&acpi_root, NULL, ACPI_ROOT_OBJECT,
1631                                         ACPI_BUS_TYPE_SYSTEM, &ops);
1632         if (result)
1633                 goto Done;
1634
1635         /*
1636          * Enumerate devices in the ACPI namespace.
1637          */
1638         result = acpi_bus_scan_fixed(acpi_root);
1639
1640         if (!result)
1641                 result = acpi_bus_scan(acpi_root, &ops);
1642
1643         if (result)
1644                 acpi_device_unregister(acpi_root, ACPI_BUS_REMOVAL_NORMAL);
1645
1646 Done:
1647         return result;
1648 }