Merge branch 'release' of git://git.kernel.org/pub/scm/linux/kernel/git/lenb/linux
[linux-drm-fsl-dcu.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 /**
87  * acpi_bus_hot_remove_device: hot-remove a device and its children
88  * @context: struct acpi_eject_event pointer (freed in this func)
89  *
90  * Hot-remove a device and its children. This function frees up the
91  * memory space passed by arg context, so that the caller may call
92  * this function asynchronously through acpi_os_hotplug_execute().
93  */
94 void acpi_bus_hot_remove_device(void *context)
95 {
96         struct acpi_eject_event *ej_event = (struct acpi_eject_event *) context;
97         struct acpi_device *device;
98         acpi_handle handle = ej_event->handle;
99         struct acpi_object_list arg_list;
100         union acpi_object arg;
101         acpi_status status = AE_OK;
102         u32 ost_code = ACPI_OST_SC_NON_SPECIFIC_FAILURE; /* default */
103
104         if (acpi_bus_get_device(handle, &device))
105                 goto err_out;
106
107         if (!device)
108                 goto err_out;
109
110         ACPI_DEBUG_PRINT((ACPI_DB_INFO,
111                 "Hot-removing device %s...\n", dev_name(&device->dev)));
112
113         if (acpi_bus_trim(device, 1)) {
114                 printk(KERN_ERR PREFIX
115                                 "Removing device failed\n");
116                 goto err_out;
117         }
118
119         /* power off device */
120         status = acpi_evaluate_object(handle, "_PS3", NULL, NULL);
121         if (ACPI_FAILURE(status) && status != AE_NOT_FOUND)
122                 printk(KERN_WARNING PREFIX
123                                 "Power-off device failed\n");
124
125         if (device->flags.lockable) {
126                 arg_list.count = 1;
127                 arg_list.pointer = &arg;
128                 arg.type = ACPI_TYPE_INTEGER;
129                 arg.integer.value = 0;
130                 acpi_evaluate_object(handle, "_LCK", &arg_list, NULL);
131         }
132
133         arg_list.count = 1;
134         arg_list.pointer = &arg;
135         arg.type = ACPI_TYPE_INTEGER;
136         arg.integer.value = 1;
137
138         /*
139          * TBD: _EJD support.
140          */
141         status = acpi_evaluate_object(handle, "_EJ0", &arg_list, NULL);
142         if (ACPI_FAILURE(status)) {
143                 if (status != AE_NOT_FOUND)
144                         printk(KERN_WARNING PREFIX
145                                         "Eject device failed\n");
146                 goto err_out;
147         }
148
149         kfree(context);
150         return;
151
152 err_out:
153         /* Inform firmware the hot-remove operation has completed w/ error */
154         (void) acpi_evaluate_hotplug_ost(handle,
155                                 ej_event->event, ost_code, NULL);
156         kfree(context);
157         return;
158 }
159
160 static ssize_t
161 acpi_eject_store(struct device *d, struct device_attribute *attr,
162                 const char *buf, size_t count)
163 {
164         int ret = count;
165         acpi_status status;
166         acpi_object_type type = 0;
167         struct acpi_device *acpi_device = to_acpi_device(d);
168         struct acpi_eject_event *ej_event;
169
170         if ((!count) || (buf[0] != '1')) {
171                 return -EINVAL;
172         }
173 #ifndef FORCE_EJECT
174         if (acpi_device->driver == NULL) {
175                 ret = -ENODEV;
176                 goto err;
177         }
178 #endif
179         status = acpi_get_type(acpi_device->handle, &type);
180         if (ACPI_FAILURE(status) || (!acpi_device->flags.ejectable)) {
181                 ret = -ENODEV;
182                 goto err;
183         }
184
185         ej_event = kmalloc(sizeof(*ej_event), GFP_KERNEL);
186         if (!ej_event) {
187                 ret = -ENOMEM;
188                 goto err;
189         }
190
191         ej_event->handle = acpi_device->handle;
192         if (acpi_device->flags.eject_pending) {
193                 /* event originated from ACPI eject notification */
194                 ej_event->event = ACPI_NOTIFY_EJECT_REQUEST;
195                 acpi_device->flags.eject_pending = 0;
196         } else {
197                 /* event originated from user */
198                 ej_event->event = ACPI_OST_EC_OSPM_EJECT;
199                 (void) acpi_evaluate_hotplug_ost(ej_event->handle,
200                         ej_event->event, ACPI_OST_SC_EJECT_IN_PROGRESS, NULL);
201         }
202
203         acpi_os_hotplug_execute(acpi_bus_hot_remove_device, (void *)ej_event);
204 err:
205         return ret;
206 }
207
208 static DEVICE_ATTR(eject, 0200, NULL, acpi_eject_store);
209
210 static ssize_t
211 acpi_device_hid_show(struct device *dev, struct device_attribute *attr, char *buf) {
212         struct acpi_device *acpi_dev = to_acpi_device(dev);
213
214         return sprintf(buf, "%s\n", acpi_device_hid(acpi_dev));
215 }
216 static DEVICE_ATTR(hid, 0444, acpi_device_hid_show, NULL);
217
218 static ssize_t
219 acpi_device_path_show(struct device *dev, struct device_attribute *attr, char *buf) {
220         struct acpi_device *acpi_dev = to_acpi_device(dev);
221         struct acpi_buffer path = {ACPI_ALLOCATE_BUFFER, NULL};
222         int result;
223
224         result = acpi_get_name(acpi_dev->handle, ACPI_FULL_PATHNAME, &path);
225         if (result)
226                 goto end;
227
228         result = sprintf(buf, "%s\n", (char*)path.pointer);
229         kfree(path.pointer);
230 end:
231         return result;
232 }
233 static DEVICE_ATTR(path, 0444, acpi_device_path_show, NULL);
234
235 static int acpi_device_setup_files(struct acpi_device *dev)
236 {
237         acpi_status status;
238         acpi_handle temp;
239         int result = 0;
240
241         /*
242          * Devices gotten from FADT don't have a "path" attribute
243          */
244         if (dev->handle) {
245                 result = device_create_file(&dev->dev, &dev_attr_path);
246                 if (result)
247                         goto end;
248         }
249
250         if (!list_empty(&dev->pnp.ids)) {
251                 result = device_create_file(&dev->dev, &dev_attr_hid);
252                 if (result)
253                         goto end;
254
255                 result = device_create_file(&dev->dev, &dev_attr_modalias);
256                 if (result)
257                         goto end;
258         }
259
260         /*
261          * If device has _EJ0, 'eject' file is created that is used to trigger
262          * hot-removal function from userland.
263          */
264         status = acpi_get_handle(dev->handle, "_EJ0", &temp);
265         if (ACPI_SUCCESS(status))
266                 result = device_create_file(&dev->dev, &dev_attr_eject);
267 end:
268         return result;
269 }
270
271 static void acpi_device_remove_files(struct acpi_device *dev)
272 {
273         acpi_status status;
274         acpi_handle temp;
275
276         /*
277          * If device has _EJ0, 'eject' file is created that is used to trigger
278          * hot-removal function from userland.
279          */
280         status = acpi_get_handle(dev->handle, "_EJ0", &temp);
281         if (ACPI_SUCCESS(status))
282                 device_remove_file(&dev->dev, &dev_attr_eject);
283
284         device_remove_file(&dev->dev, &dev_attr_modalias);
285         device_remove_file(&dev->dev, &dev_attr_hid);
286         if (dev->handle)
287                 device_remove_file(&dev->dev, &dev_attr_path);
288 }
289 /* --------------------------------------------------------------------------
290                         ACPI Bus operations
291    -------------------------------------------------------------------------- */
292
293 int acpi_match_device_ids(struct acpi_device *device,
294                           const struct acpi_device_id *ids)
295 {
296         const struct acpi_device_id *id;
297         struct acpi_hardware_id *hwid;
298
299         /*
300          * If the device is not present, it is unnecessary to load device
301          * driver for it.
302          */
303         if (!device->status.present)
304                 return -ENODEV;
305
306         for (id = ids; id->id[0]; id++)
307                 list_for_each_entry(hwid, &device->pnp.ids, list)
308                         if (!strcmp((char *) id->id, hwid->id))
309                                 return 0;
310
311         return -ENOENT;
312 }
313 EXPORT_SYMBOL(acpi_match_device_ids);
314
315 static void acpi_free_ids(struct acpi_device *device)
316 {
317         struct acpi_hardware_id *id, *tmp;
318
319         list_for_each_entry_safe(id, tmp, &device->pnp.ids, list) {
320                 kfree(id->id);
321                 kfree(id);
322         }
323 }
324
325 static void acpi_device_release(struct device *dev)
326 {
327         struct acpi_device *acpi_dev = to_acpi_device(dev);
328
329         acpi_free_ids(acpi_dev);
330         kfree(acpi_dev);
331 }
332
333 static int acpi_bus_match(struct device *dev, struct device_driver *drv)
334 {
335         struct acpi_device *acpi_dev = to_acpi_device(dev);
336         struct acpi_driver *acpi_drv = to_acpi_driver(drv);
337
338         return !acpi_match_device_ids(acpi_dev, acpi_drv->ids);
339 }
340
341 static int acpi_device_uevent(struct device *dev, struct kobj_uevent_env *env)
342 {
343         struct acpi_device *acpi_dev = to_acpi_device(dev);
344         int len;
345
346         if (list_empty(&acpi_dev->pnp.ids))
347                 return 0;
348
349         if (add_uevent_var(env, "MODALIAS="))
350                 return -ENOMEM;
351         len = create_modalias(acpi_dev, &env->buf[env->buflen - 1],
352                               sizeof(env->buf) - env->buflen);
353         if (len >= (sizeof(env->buf) - env->buflen))
354                 return -ENOMEM;
355         env->buflen += len;
356         return 0;
357 }
358
359 static void acpi_device_notify(acpi_handle handle, u32 event, void *data)
360 {
361         struct acpi_device *device = data;
362
363         device->driver->ops.notify(device, event);
364 }
365
366 static acpi_status acpi_device_notify_fixed(void *data)
367 {
368         struct acpi_device *device = data;
369
370         /* Fixed hardware devices have no handles */
371         acpi_device_notify(NULL, ACPI_FIXED_HARDWARE_EVENT, device);
372         return AE_OK;
373 }
374
375 static int acpi_device_install_notify_handler(struct acpi_device *device)
376 {
377         acpi_status status;
378
379         if (device->device_type == ACPI_BUS_TYPE_POWER_BUTTON)
380                 status =
381                     acpi_install_fixed_event_handler(ACPI_EVENT_POWER_BUTTON,
382                                                      acpi_device_notify_fixed,
383                                                      device);
384         else if (device->device_type == ACPI_BUS_TYPE_SLEEP_BUTTON)
385                 status =
386                     acpi_install_fixed_event_handler(ACPI_EVENT_SLEEP_BUTTON,
387                                                      acpi_device_notify_fixed,
388                                                      device);
389         else
390                 status = acpi_install_notify_handler(device->handle,
391                                                      ACPI_DEVICE_NOTIFY,
392                                                      acpi_device_notify,
393                                                      device);
394
395         if (ACPI_FAILURE(status))
396                 return -EINVAL;
397         return 0;
398 }
399
400 static void acpi_device_remove_notify_handler(struct acpi_device *device)
401 {
402         if (device->device_type == ACPI_BUS_TYPE_POWER_BUTTON)
403                 acpi_remove_fixed_event_handler(ACPI_EVENT_POWER_BUTTON,
404                                                 acpi_device_notify_fixed);
405         else if (device->device_type == ACPI_BUS_TYPE_SLEEP_BUTTON)
406                 acpi_remove_fixed_event_handler(ACPI_EVENT_SLEEP_BUTTON,
407                                                 acpi_device_notify_fixed);
408         else
409                 acpi_remove_notify_handler(device->handle, ACPI_DEVICE_NOTIFY,
410                                            acpi_device_notify);
411 }
412
413 static int acpi_bus_driver_init(struct acpi_device *, struct acpi_driver *);
414 static int acpi_start_single_object(struct acpi_device *);
415 static int acpi_device_probe(struct device * dev)
416 {
417         struct acpi_device *acpi_dev = to_acpi_device(dev);
418         struct acpi_driver *acpi_drv = to_acpi_driver(dev->driver);
419         int ret;
420
421         ret = acpi_bus_driver_init(acpi_dev, acpi_drv);
422         if (!ret) {
423                 if (acpi_dev->bus_ops.acpi_op_start)
424                         acpi_start_single_object(acpi_dev);
425
426                 if (acpi_drv->ops.notify) {
427                         ret = acpi_device_install_notify_handler(acpi_dev);
428                         if (ret) {
429                                 if (acpi_drv->ops.remove)
430                                         acpi_drv->ops.remove(acpi_dev,
431                                                      acpi_dev->removal_type);
432                                 return ret;
433                         }
434                 }
435
436                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
437                         "Found driver [%s] for device [%s]\n",
438                         acpi_drv->name, acpi_dev->pnp.bus_id));
439                 get_device(dev);
440         }
441         return ret;
442 }
443
444 static int acpi_device_remove(struct device * dev)
445 {
446         struct acpi_device *acpi_dev = to_acpi_device(dev);
447         struct acpi_driver *acpi_drv = acpi_dev->driver;
448
449         if (acpi_drv) {
450                 if (acpi_drv->ops.notify)
451                         acpi_device_remove_notify_handler(acpi_dev);
452                 if (acpi_drv->ops.remove)
453                         acpi_drv->ops.remove(acpi_dev, acpi_dev->removal_type);
454         }
455         acpi_dev->driver = NULL;
456         acpi_dev->driver_data = NULL;
457
458         put_device(dev);
459         return 0;
460 }
461
462 struct bus_type acpi_bus_type = {
463         .name           = "acpi",
464         .match          = acpi_bus_match,
465         .probe          = acpi_device_probe,
466         .remove         = acpi_device_remove,
467         .uevent         = acpi_device_uevent,
468 };
469
470 static int acpi_device_register(struct acpi_device *device)
471 {
472         int result;
473         struct acpi_device_bus_id *acpi_device_bus_id, *new_bus_id;
474         int found = 0;
475
476         /*
477          * Linkage
478          * -------
479          * Link this device to its parent and siblings.
480          */
481         INIT_LIST_HEAD(&device->children);
482         INIT_LIST_HEAD(&device->node);
483         INIT_LIST_HEAD(&device->wakeup_list);
484
485         new_bus_id = kzalloc(sizeof(struct acpi_device_bus_id), GFP_KERNEL);
486         if (!new_bus_id) {
487                 printk(KERN_ERR PREFIX "Memory allocation error\n");
488                 return -ENOMEM;
489         }
490
491         mutex_lock(&acpi_device_lock);
492         /*
493          * Find suitable bus_id and instance number in acpi_bus_id_list
494          * If failed, create one and link it into acpi_bus_id_list
495          */
496         list_for_each_entry(acpi_device_bus_id, &acpi_bus_id_list, node) {
497                 if (!strcmp(acpi_device_bus_id->bus_id,
498                             acpi_device_hid(device))) {
499                         acpi_device_bus_id->instance_no++;
500                         found = 1;
501                         kfree(new_bus_id);
502                         break;
503                 }
504         }
505         if (!found) {
506                 acpi_device_bus_id = new_bus_id;
507                 strcpy(acpi_device_bus_id->bus_id, acpi_device_hid(device));
508                 acpi_device_bus_id->instance_no = 0;
509                 list_add_tail(&acpi_device_bus_id->node, &acpi_bus_id_list);
510         }
511         dev_set_name(&device->dev, "%s:%02x", acpi_device_bus_id->bus_id, acpi_device_bus_id->instance_no);
512
513         if (device->parent)
514                 list_add_tail(&device->node, &device->parent->children);
515
516         if (device->wakeup.flags.valid)
517                 list_add_tail(&device->wakeup_list, &acpi_wakeup_device_list);
518         mutex_unlock(&acpi_device_lock);
519
520         if (device->parent)
521                 device->dev.parent = &device->parent->dev;
522         device->dev.bus = &acpi_bus_type;
523         device->dev.release = &acpi_device_release;
524         result = device_register(&device->dev);
525         if (result) {
526                 dev_err(&device->dev, "Error registering device\n");
527                 goto end;
528         }
529
530         result = acpi_device_setup_files(device);
531         if (result)
532                 printk(KERN_ERR PREFIX "Error creating sysfs interface for device %s\n",
533                        dev_name(&device->dev));
534
535         device->removal_type = ACPI_BUS_REMOVAL_NORMAL;
536         return 0;
537 end:
538         mutex_lock(&acpi_device_lock);
539         if (device->parent)
540                 list_del(&device->node);
541         list_del(&device->wakeup_list);
542         mutex_unlock(&acpi_device_lock);
543         return result;
544 }
545
546 static void acpi_device_unregister(struct acpi_device *device, int type)
547 {
548         mutex_lock(&acpi_device_lock);
549         if (device->parent)
550                 list_del(&device->node);
551
552         list_del(&device->wakeup_list);
553         mutex_unlock(&acpi_device_lock);
554
555         acpi_detach_data(device->handle, acpi_bus_data_handler);
556
557         acpi_device_remove_files(device);
558         device_unregister(&device->dev);
559 }
560
561 /* --------------------------------------------------------------------------
562                                  Driver Management
563    -------------------------------------------------------------------------- */
564 /**
565  * acpi_bus_driver_init - add a device to a driver
566  * @device: the device to add and initialize
567  * @driver: driver for the device
568  *
569  * Used to initialize a device via its device driver.  Called whenever a
570  * driver is bound to a device.  Invokes the driver's add() ops.
571  */
572 static int
573 acpi_bus_driver_init(struct acpi_device *device, struct acpi_driver *driver)
574 {
575         int result = 0;
576
577         if (!device || !driver)
578                 return -EINVAL;
579
580         if (!driver->ops.add)
581                 return -ENOSYS;
582
583         result = driver->ops.add(device);
584         if (result) {
585                 device->driver = NULL;
586                 device->driver_data = NULL;
587                 return result;
588         }
589
590         device->driver = driver;
591
592         /*
593          * TBD - Configuration Management: Assign resources to device based
594          * upon possible configuration and currently allocated resources.
595          */
596
597         ACPI_DEBUG_PRINT((ACPI_DB_INFO,
598                           "Driver successfully bound to device\n"));
599         return 0;
600 }
601
602 static int acpi_start_single_object(struct acpi_device *device)
603 {
604         int result = 0;
605         struct acpi_driver *driver;
606
607
608         if (!(driver = device->driver))
609                 return 0;
610
611         if (driver->ops.start) {
612                 result = driver->ops.start(device);
613                 if (result && driver->ops.remove)
614                         driver->ops.remove(device, ACPI_BUS_REMOVAL_NORMAL);
615         }
616
617         return result;
618 }
619
620 /**
621  * acpi_bus_register_driver - register a driver with the ACPI bus
622  * @driver: driver being registered
623  *
624  * Registers a driver with the ACPI bus.  Searches the namespace for all
625  * devices that match the driver's criteria and binds.  Returns zero for
626  * success or a negative error status for failure.
627  */
628 int acpi_bus_register_driver(struct acpi_driver *driver)
629 {
630         int ret;
631
632         if (acpi_disabled)
633                 return -ENODEV;
634         driver->drv.name = driver->name;
635         driver->drv.bus = &acpi_bus_type;
636         driver->drv.owner = driver->owner;
637
638         ret = driver_register(&driver->drv);
639         return ret;
640 }
641
642 EXPORT_SYMBOL(acpi_bus_register_driver);
643
644 /**
645  * acpi_bus_unregister_driver - unregisters a driver with the APIC bus
646  * @driver: driver to unregister
647  *
648  * Unregisters a driver with the ACPI bus.  Searches the namespace for all
649  * devices that match the driver's criteria and unbinds.
650  */
651 void acpi_bus_unregister_driver(struct acpi_driver *driver)
652 {
653         driver_unregister(&driver->drv);
654 }
655
656 EXPORT_SYMBOL(acpi_bus_unregister_driver);
657
658 /* --------------------------------------------------------------------------
659                                  Device Enumeration
660    -------------------------------------------------------------------------- */
661 static struct acpi_device *acpi_bus_get_parent(acpi_handle handle)
662 {
663         acpi_status status;
664         int ret;
665         struct acpi_device *device;
666
667         /*
668          * Fixed hardware devices do not appear in the namespace and do not
669          * have handles, but we fabricate acpi_devices for them, so we have
670          * to deal with them specially.
671          */
672         if (handle == NULL)
673                 return acpi_root;
674
675         do {
676                 status = acpi_get_parent(handle, &handle);
677                 if (status == AE_NULL_ENTRY)
678                         return NULL;
679                 if (ACPI_FAILURE(status))
680                         return acpi_root;
681
682                 ret = acpi_bus_get_device(handle, &device);
683                 if (ret == 0)
684                         return device;
685         } while (1);
686 }
687
688 acpi_status
689 acpi_bus_get_ejd(acpi_handle handle, acpi_handle *ejd)
690 {
691         acpi_status status;
692         acpi_handle tmp;
693         struct acpi_buffer buffer = {ACPI_ALLOCATE_BUFFER, NULL};
694         union acpi_object *obj;
695
696         status = acpi_get_handle(handle, "_EJD", &tmp);
697         if (ACPI_FAILURE(status))
698                 return status;
699
700         status = acpi_evaluate_object(handle, "_EJD", NULL, &buffer);
701         if (ACPI_SUCCESS(status)) {
702                 obj = buffer.pointer;
703                 status = acpi_get_handle(ACPI_ROOT_OBJECT, obj->string.pointer,
704                                          ejd);
705                 kfree(buffer.pointer);
706         }
707         return status;
708 }
709 EXPORT_SYMBOL_GPL(acpi_bus_get_ejd);
710
711 void acpi_bus_data_handler(acpi_handle handle, void *context)
712 {
713
714         /* TBD */
715
716         return;
717 }
718
719 static int acpi_bus_get_perf_flags(struct acpi_device *device)
720 {
721         device->performance.state = ACPI_STATE_UNKNOWN;
722         return 0;
723 }
724
725 static acpi_status
726 acpi_bus_extract_wakeup_device_power_package(acpi_handle handle,
727                                              struct acpi_device_wakeup *wakeup)
728 {
729         struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
730         union acpi_object *package = NULL;
731         union acpi_object *element = NULL;
732         acpi_status status;
733         int i = 0;
734
735         if (!wakeup)
736                 return AE_BAD_PARAMETER;
737
738         /* _PRW */
739         status = acpi_evaluate_object(handle, "_PRW", NULL, &buffer);
740         if (ACPI_FAILURE(status)) {
741                 ACPI_EXCEPTION((AE_INFO, status, "Evaluating _PRW"));
742                 return status;
743         }
744
745         package = (union acpi_object *)buffer.pointer;
746
747         if (!package || (package->package.count < 2)) {
748                 status = AE_BAD_DATA;
749                 goto out;
750         }
751
752         element = &(package->package.elements[0]);
753         if (!element) {
754                 status = AE_BAD_DATA;
755                 goto out;
756         }
757         if (element->type == ACPI_TYPE_PACKAGE) {
758                 if ((element->package.count < 2) ||
759                     (element->package.elements[0].type !=
760                      ACPI_TYPE_LOCAL_REFERENCE)
761                     || (element->package.elements[1].type != ACPI_TYPE_INTEGER)) {
762                         status = AE_BAD_DATA;
763                         goto out;
764                 }
765                 wakeup->gpe_device =
766                     element->package.elements[0].reference.handle;
767                 wakeup->gpe_number =
768                     (u32) element->package.elements[1].integer.value;
769         } else if (element->type == ACPI_TYPE_INTEGER) {
770                 wakeup->gpe_device = NULL;
771                 wakeup->gpe_number = element->integer.value;
772         } else {
773                 status = AE_BAD_DATA;
774                 goto out;
775         }
776
777         element = &(package->package.elements[1]);
778         if (element->type != ACPI_TYPE_INTEGER) {
779                 status = AE_BAD_DATA;
780                 goto out;
781         }
782         wakeup->sleep_state = element->integer.value;
783
784         if ((package->package.count - 2) > ACPI_MAX_HANDLES) {
785                 status = AE_NO_MEMORY;
786                 goto out;
787         }
788         wakeup->resources.count = package->package.count - 2;
789         for (i = 0; i < wakeup->resources.count; i++) {
790                 element = &(package->package.elements[i + 2]);
791                 if (element->type != ACPI_TYPE_LOCAL_REFERENCE) {
792                         status = AE_BAD_DATA;
793                         goto out;
794                 }
795
796                 wakeup->resources.handles[i] = element->reference.handle;
797         }
798
799         acpi_setup_gpe_for_wake(handle, wakeup->gpe_device, wakeup->gpe_number);
800
801  out:
802         kfree(buffer.pointer);
803
804         return status;
805 }
806
807 static void acpi_bus_set_run_wake_flags(struct acpi_device *device)
808 {
809         struct acpi_device_id button_device_ids[] = {
810                 {"PNP0C0D", 0},
811                 {"PNP0C0C", 0},
812                 {"PNP0C0E", 0},
813                 {"", 0},
814         };
815         acpi_status status;
816         acpi_event_status event_status;
817
818         device->wakeup.flags.notifier_present = 0;
819
820         /* Power button, Lid switch always enable wakeup */
821         if (!acpi_match_device_ids(device, button_device_ids)) {
822                 device->wakeup.flags.run_wake = 1;
823                 device_set_wakeup_capable(&device->dev, true);
824                 return;
825         }
826
827         status = acpi_get_gpe_status(device->wakeup.gpe_device,
828                                         device->wakeup.gpe_number,
829                                                 &event_status);
830         if (status == AE_OK)
831                 device->wakeup.flags.run_wake =
832                                 !!(event_status & ACPI_EVENT_FLAG_HANDLE);
833 }
834
835 static void acpi_bus_get_wakeup_device_flags(struct acpi_device *device)
836 {
837         acpi_handle temp;
838         acpi_status status = 0;
839         int psw_error;
840
841         /* Presence of _PRW indicates wake capable */
842         status = acpi_get_handle(device->handle, "_PRW", &temp);
843         if (ACPI_FAILURE(status))
844                 return;
845
846         status = acpi_bus_extract_wakeup_device_power_package(device->handle,
847                                                               &device->wakeup);
848         if (ACPI_FAILURE(status)) {
849                 ACPI_EXCEPTION((AE_INFO, status, "Extracting _PRW package"));
850                 return;
851         }
852
853         device->wakeup.flags.valid = 1;
854         device->wakeup.prepare_count = 0;
855         acpi_bus_set_run_wake_flags(device);
856         /* Call _PSW/_DSW object to disable its ability to wake the sleeping
857          * system for the ACPI device with the _PRW object.
858          * The _PSW object is depreciated in ACPI 3.0 and is replaced by _DSW.
859          * So it is necessary to call _DSW object first. Only when it is not
860          * present will the _PSW object used.
861          */
862         psw_error = acpi_device_sleep_wake(device, 0, 0, 0);
863         if (psw_error)
864                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
865                                 "error in _DSW or _PSW evaluation\n"));
866 }
867
868 static void acpi_bus_add_power_resource(acpi_handle handle);
869
870 static int acpi_bus_get_power_flags(struct acpi_device *device)
871 {
872         acpi_status status = 0;
873         acpi_handle handle = NULL;
874         u32 i = 0;
875
876
877         /*
878          * Power Management Flags
879          */
880         status = acpi_get_handle(device->handle, "_PSC", &handle);
881         if (ACPI_SUCCESS(status))
882                 device->power.flags.explicit_get = 1;
883         status = acpi_get_handle(device->handle, "_IRC", &handle);
884         if (ACPI_SUCCESS(status))
885                 device->power.flags.inrush_current = 1;
886
887         /*
888          * Enumerate supported power management states
889          */
890         for (i = ACPI_STATE_D0; i <= ACPI_STATE_D3_HOT; i++) {
891                 struct acpi_device_power_state *ps = &device->power.states[i];
892                 char object_name[5] = { '_', 'P', 'R', '0' + i, '\0' };
893
894                 /* Evaluate "_PRx" to se if power resources are referenced */
895                 acpi_evaluate_reference(device->handle, object_name, NULL,
896                                         &ps->resources);
897                 if (ps->resources.count) {
898                         int j;
899
900                         device->power.flags.power_resources = 1;
901                         for (j = 0; j < ps->resources.count; j++)
902                                 acpi_bus_add_power_resource(ps->resources.handles[j]);
903                 }
904
905                 /* Evaluate "_PSx" to see if we can do explicit sets */
906                 object_name[2] = 'S';
907                 status = acpi_get_handle(device->handle, object_name, &handle);
908                 if (ACPI_SUCCESS(status))
909                         ps->flags.explicit_set = 1;
910
911                 /*
912                  * State is valid if there are means to put the device into it.
913                  * D3hot is only valid if _PR3 present.
914                  */
915                 if (ps->resources.count ||
916                     (ps->flags.explicit_set && i < ACPI_STATE_D3_HOT))
917                         ps->flags.valid = 1;
918
919                 ps->power = -1; /* Unknown - driver assigned */
920                 ps->latency = -1;       /* Unknown - driver assigned */
921         }
922
923         /* Set defaults for D0 and D3 states (always valid) */
924         device->power.states[ACPI_STATE_D0].flags.valid = 1;
925         device->power.states[ACPI_STATE_D0].power = 100;
926         device->power.states[ACPI_STATE_D3].flags.valid = 1;
927         device->power.states[ACPI_STATE_D3].power = 0;
928
929         /* Set D3cold's explicit_set flag if _PS3 exists. */
930         if (device->power.states[ACPI_STATE_D3_HOT].flags.explicit_set)
931                 device->power.states[ACPI_STATE_D3_COLD].flags.explicit_set = 1;
932
933         acpi_bus_init_power(device);
934
935         return 0;
936 }
937
938 static int acpi_bus_get_flags(struct acpi_device *device)
939 {
940         acpi_status status = AE_OK;
941         acpi_handle temp = NULL;
942
943
944         /* Presence of _STA indicates 'dynamic_status' */
945         status = acpi_get_handle(device->handle, "_STA", &temp);
946         if (ACPI_SUCCESS(status))
947                 device->flags.dynamic_status = 1;
948
949         /* Presence of _RMV indicates 'removable' */
950         status = acpi_get_handle(device->handle, "_RMV", &temp);
951         if (ACPI_SUCCESS(status))
952                 device->flags.removable = 1;
953
954         /* Presence of _EJD|_EJ0 indicates 'ejectable' */
955         status = acpi_get_handle(device->handle, "_EJD", &temp);
956         if (ACPI_SUCCESS(status))
957                 device->flags.ejectable = 1;
958         else {
959                 status = acpi_get_handle(device->handle, "_EJ0", &temp);
960                 if (ACPI_SUCCESS(status))
961                         device->flags.ejectable = 1;
962         }
963
964         /* Presence of _LCK indicates 'lockable' */
965         status = acpi_get_handle(device->handle, "_LCK", &temp);
966         if (ACPI_SUCCESS(status))
967                 device->flags.lockable = 1;
968
969         /* Power resources cannot be power manageable. */
970         if (device->device_type == ACPI_BUS_TYPE_POWER)
971                 return 0;
972
973         /* Presence of _PS0|_PR0 indicates 'power manageable' */
974         status = acpi_get_handle(device->handle, "_PS0", &temp);
975         if (ACPI_FAILURE(status))
976                 status = acpi_get_handle(device->handle, "_PR0", &temp);
977         if (ACPI_SUCCESS(status))
978                 device->flags.power_manageable = 1;
979
980         /* TBD: Performance management */
981
982         return 0;
983 }
984
985 static void acpi_device_get_busid(struct acpi_device *device)
986 {
987         char bus_id[5] = { '?', 0 };
988         struct acpi_buffer buffer = { sizeof(bus_id), bus_id };
989         int i = 0;
990
991         /*
992          * Bus ID
993          * ------
994          * The device's Bus ID is simply the object name.
995          * TBD: Shouldn't this value be unique (within the ACPI namespace)?
996          */
997         if (ACPI_IS_ROOT_DEVICE(device)) {
998                 strcpy(device->pnp.bus_id, "ACPI");
999                 return;
1000         }
1001
1002         switch (device->device_type) {
1003         case ACPI_BUS_TYPE_POWER_BUTTON:
1004                 strcpy(device->pnp.bus_id, "PWRF");
1005                 break;
1006         case ACPI_BUS_TYPE_SLEEP_BUTTON:
1007                 strcpy(device->pnp.bus_id, "SLPF");
1008                 break;
1009         default:
1010                 acpi_get_name(device->handle, ACPI_SINGLE_NAME, &buffer);
1011                 /* Clean up trailing underscores (if any) */
1012                 for (i = 3; i > 1; i--) {
1013                         if (bus_id[i] == '_')
1014                                 bus_id[i] = '\0';
1015                         else
1016                                 break;
1017                 }
1018                 strcpy(device->pnp.bus_id, bus_id);
1019                 break;
1020         }
1021 }
1022
1023 /*
1024  * acpi_bay_match - see if a device is an ejectable driver bay
1025  *
1026  * If an acpi object is ejectable and has one of the ACPI ATA methods defined,
1027  * then we can safely call it an ejectable drive bay
1028  */
1029 static int acpi_bay_match(struct acpi_device *device){
1030         acpi_status status;
1031         acpi_handle handle;
1032         acpi_handle tmp;
1033         acpi_handle phandle;
1034
1035         handle = device->handle;
1036
1037         status = acpi_get_handle(handle, "_EJ0", &tmp);
1038         if (ACPI_FAILURE(status))
1039                 return -ENODEV;
1040
1041         if ((ACPI_SUCCESS(acpi_get_handle(handle, "_GTF", &tmp))) ||
1042                 (ACPI_SUCCESS(acpi_get_handle(handle, "_GTM", &tmp))) ||
1043                 (ACPI_SUCCESS(acpi_get_handle(handle, "_STM", &tmp))) ||
1044                 (ACPI_SUCCESS(acpi_get_handle(handle, "_SDD", &tmp))))
1045                 return 0;
1046
1047         if (acpi_get_parent(handle, &phandle))
1048                 return -ENODEV;
1049
1050         if ((ACPI_SUCCESS(acpi_get_handle(phandle, "_GTF", &tmp))) ||
1051                 (ACPI_SUCCESS(acpi_get_handle(phandle, "_GTM", &tmp))) ||
1052                 (ACPI_SUCCESS(acpi_get_handle(phandle, "_STM", &tmp))) ||
1053                 (ACPI_SUCCESS(acpi_get_handle(phandle, "_SDD", &tmp))))
1054                 return 0;
1055
1056         return -ENODEV;
1057 }
1058
1059 /*
1060  * acpi_dock_match - see if a device has a _DCK method
1061  */
1062 static int acpi_dock_match(struct acpi_device *device)
1063 {
1064         acpi_handle tmp;
1065         return acpi_get_handle(device->handle, "_DCK", &tmp);
1066 }
1067
1068 const char *acpi_device_hid(struct acpi_device *device)
1069 {
1070         struct acpi_hardware_id *hid;
1071
1072         if (list_empty(&device->pnp.ids))
1073                 return dummy_hid;
1074
1075         hid = list_first_entry(&device->pnp.ids, struct acpi_hardware_id, list);
1076         return hid->id;
1077 }
1078 EXPORT_SYMBOL(acpi_device_hid);
1079
1080 static void acpi_add_id(struct acpi_device *device, const char *dev_id)
1081 {
1082         struct acpi_hardware_id *id;
1083
1084         id = kmalloc(sizeof(*id), GFP_KERNEL);
1085         if (!id)
1086                 return;
1087
1088         id->id = kstrdup(dev_id, GFP_KERNEL);
1089         if (!id->id) {
1090                 kfree(id);
1091                 return;
1092         }
1093
1094         list_add_tail(&id->list, &device->pnp.ids);
1095 }
1096
1097 /*
1098  * Old IBM workstations have a DSDT bug wherein the SMBus object
1099  * lacks the SMBUS01 HID and the methods do not have the necessary "_"
1100  * prefix.  Work around this.
1101  */
1102 static int acpi_ibm_smbus_match(struct acpi_device *device)
1103 {
1104         acpi_handle h_dummy;
1105         struct acpi_buffer path = {ACPI_ALLOCATE_BUFFER, NULL};
1106         int result;
1107
1108         if (!dmi_name_in_vendors("IBM"))
1109                 return -ENODEV;
1110
1111         /* Look for SMBS object */
1112         result = acpi_get_name(device->handle, ACPI_SINGLE_NAME, &path);
1113         if (result)
1114                 return result;
1115
1116         if (strcmp("SMBS", path.pointer)) {
1117                 result = -ENODEV;
1118                 goto out;
1119         }
1120
1121         /* Does it have the necessary (but misnamed) methods? */
1122         result = -ENODEV;
1123         if (ACPI_SUCCESS(acpi_get_handle(device->handle, "SBI", &h_dummy)) &&
1124             ACPI_SUCCESS(acpi_get_handle(device->handle, "SBR", &h_dummy)) &&
1125             ACPI_SUCCESS(acpi_get_handle(device->handle, "SBW", &h_dummy)))
1126                 result = 0;
1127 out:
1128         kfree(path.pointer);
1129         return result;
1130 }
1131
1132 static void acpi_device_set_id(struct acpi_device *device)
1133 {
1134         acpi_status status;
1135         struct acpi_device_info *info;
1136         struct acpica_device_id_list *cid_list;
1137         int i;
1138
1139         switch (device->device_type) {
1140         case ACPI_BUS_TYPE_DEVICE:
1141                 if (ACPI_IS_ROOT_DEVICE(device)) {
1142                         acpi_add_id(device, ACPI_SYSTEM_HID);
1143                         break;
1144                 }
1145
1146                 status = acpi_get_object_info(device->handle, &info);
1147                 if (ACPI_FAILURE(status)) {
1148                         printk(KERN_ERR PREFIX "%s: Error reading device info\n", __func__);
1149                         return;
1150                 }
1151
1152                 if (info->valid & ACPI_VALID_HID)
1153                         acpi_add_id(device, info->hardware_id.string);
1154                 if (info->valid & ACPI_VALID_CID) {
1155                         cid_list = &info->compatible_id_list;
1156                         for (i = 0; i < cid_list->count; i++)
1157                                 acpi_add_id(device, cid_list->ids[i].string);
1158                 }
1159                 if (info->valid & ACPI_VALID_ADR) {
1160                         device->pnp.bus_address = info->address;
1161                         device->flags.bus_address = 1;
1162                 }
1163
1164                 kfree(info);
1165
1166                 /*
1167                  * Some devices don't reliably have _HIDs & _CIDs, so add
1168                  * synthetic HIDs to make sure drivers can find them.
1169                  */
1170                 if (acpi_is_video_device(device))
1171                         acpi_add_id(device, ACPI_VIDEO_HID);
1172                 else if (ACPI_SUCCESS(acpi_bay_match(device)))
1173                         acpi_add_id(device, ACPI_BAY_HID);
1174                 else if (ACPI_SUCCESS(acpi_dock_match(device)))
1175                         acpi_add_id(device, ACPI_DOCK_HID);
1176                 else if (!acpi_ibm_smbus_match(device))
1177                         acpi_add_id(device, ACPI_SMBUS_IBM_HID);
1178                 else if (!acpi_device_hid(device) &&
1179                          ACPI_IS_ROOT_DEVICE(device->parent)) {
1180                         acpi_add_id(device, ACPI_BUS_HID); /* \_SB, LNXSYBUS */
1181                         strcpy(device->pnp.device_name, ACPI_BUS_DEVICE_NAME);
1182                         strcpy(device->pnp.device_class, ACPI_BUS_CLASS);
1183                 }
1184
1185                 break;
1186         case ACPI_BUS_TYPE_POWER:
1187                 acpi_add_id(device, ACPI_POWER_HID);
1188                 break;
1189         case ACPI_BUS_TYPE_PROCESSOR:
1190                 acpi_add_id(device, ACPI_PROCESSOR_OBJECT_HID);
1191                 break;
1192         case ACPI_BUS_TYPE_THERMAL:
1193                 acpi_add_id(device, ACPI_THERMAL_HID);
1194                 break;
1195         case ACPI_BUS_TYPE_POWER_BUTTON:
1196                 acpi_add_id(device, ACPI_BUTTON_HID_POWERF);
1197                 break;
1198         case ACPI_BUS_TYPE_SLEEP_BUTTON:
1199                 acpi_add_id(device, ACPI_BUTTON_HID_SLEEPF);
1200                 break;
1201         }
1202 }
1203
1204 static int acpi_device_set_context(struct acpi_device *device)
1205 {
1206         acpi_status status;
1207
1208         /*
1209          * Context
1210          * -------
1211          * Attach this 'struct acpi_device' to the ACPI object.  This makes
1212          * resolutions from handle->device very efficient.  Fixed hardware
1213          * devices have no handles, so we skip them.
1214          */
1215         if (!device->handle)
1216                 return 0;
1217
1218         status = acpi_attach_data(device->handle,
1219                                   acpi_bus_data_handler, device);
1220         if (ACPI_SUCCESS(status))
1221                 return 0;
1222
1223         printk(KERN_ERR PREFIX "Error attaching device data\n");
1224         return -ENODEV;
1225 }
1226
1227 static int acpi_bus_remove(struct acpi_device *dev, int rmdevice)
1228 {
1229         if (!dev)
1230                 return -EINVAL;
1231
1232         dev->removal_type = ACPI_BUS_REMOVAL_EJECT;
1233         device_release_driver(&dev->dev);
1234
1235         if (!rmdevice)
1236                 return 0;
1237
1238         /*
1239          * unbind _ADR-Based Devices when hot removal
1240          */
1241         if (dev->flags.bus_address) {
1242                 if ((dev->parent) && (dev->parent->ops.unbind))
1243                         dev->parent->ops.unbind(dev);
1244         }
1245         acpi_device_unregister(dev, ACPI_BUS_REMOVAL_EJECT);
1246
1247         return 0;
1248 }
1249
1250 static int acpi_add_single_object(struct acpi_device **child,
1251                                   acpi_handle handle, int type,
1252                                   unsigned long long sta,
1253                                   struct acpi_bus_ops *ops)
1254 {
1255         int result;
1256         struct acpi_device *device;
1257         struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
1258
1259         device = kzalloc(sizeof(struct acpi_device), GFP_KERNEL);
1260         if (!device) {
1261                 printk(KERN_ERR PREFIX "Memory allocation error\n");
1262                 return -ENOMEM;
1263         }
1264
1265         INIT_LIST_HEAD(&device->pnp.ids);
1266         device->device_type = type;
1267         device->handle = handle;
1268         device->parent = acpi_bus_get_parent(handle);
1269         device->bus_ops = *ops; /* workround for not call .start */
1270         STRUCT_TO_INT(device->status) = sta;
1271
1272         acpi_device_get_busid(device);
1273
1274         /*
1275          * Flags
1276          * -----
1277          * Note that we only look for object handles -- cannot evaluate objects
1278          * until we know the device is present and properly initialized.
1279          */
1280         result = acpi_bus_get_flags(device);
1281         if (result)
1282                 goto end;
1283
1284         /*
1285          * Initialize Device
1286          * -----------------
1287          * TBD: Synch with Core's enumeration/initialization process.
1288          */
1289         acpi_device_set_id(device);
1290
1291         /*
1292          * Power Management
1293          * ----------------
1294          */
1295         if (device->flags.power_manageable) {
1296                 result = acpi_bus_get_power_flags(device);
1297                 if (result)
1298                         goto end;
1299         }
1300
1301         /*
1302          * Wakeup device management
1303          *-----------------------
1304          */
1305         acpi_bus_get_wakeup_device_flags(device);
1306
1307         /*
1308          * Performance Management
1309          * ----------------------
1310          */
1311         if (device->flags.performance_manageable) {
1312                 result = acpi_bus_get_perf_flags(device);
1313                 if (result)
1314                         goto end;
1315         }
1316
1317         if ((result = acpi_device_set_context(device)))
1318                 goto end;
1319
1320         result = acpi_device_register(device);
1321
1322         /*
1323          * Bind _ADR-Based Devices when hot add
1324          */
1325         if (device->flags.bus_address) {
1326                 if (device->parent && device->parent->ops.bind)
1327                         device->parent->ops.bind(device);
1328         }
1329
1330 end:
1331         if (!result) {
1332                 acpi_get_name(handle, ACPI_FULL_PATHNAME, &buffer);
1333                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
1334                         "Adding %s [%s] parent %s\n", dev_name(&device->dev),
1335                          (char *) buffer.pointer,
1336                          device->parent ? dev_name(&device->parent->dev) :
1337                                           "(null)"));
1338                 kfree(buffer.pointer);
1339                 *child = device;
1340         } else
1341                 acpi_device_release(&device->dev);
1342
1343         return result;
1344 }
1345
1346 #define ACPI_STA_DEFAULT (ACPI_STA_DEVICE_PRESENT | ACPI_STA_DEVICE_ENABLED | \
1347                           ACPI_STA_DEVICE_UI      | ACPI_STA_DEVICE_FUNCTIONING)
1348
1349 static void acpi_bus_add_power_resource(acpi_handle handle)
1350 {
1351         struct acpi_bus_ops ops = {
1352                 .acpi_op_add = 1,
1353                 .acpi_op_start = 1,
1354         };
1355         struct acpi_device *device = NULL;
1356
1357         acpi_bus_get_device(handle, &device);
1358         if (!device)
1359                 acpi_add_single_object(&device, handle, ACPI_BUS_TYPE_POWER,
1360                                         ACPI_STA_DEFAULT, &ops);
1361 }
1362
1363 static int acpi_bus_type_and_status(acpi_handle handle, int *type,
1364                                     unsigned long long *sta)
1365 {
1366         acpi_status status;
1367         acpi_object_type acpi_type;
1368
1369         status = acpi_get_type(handle, &acpi_type);
1370         if (ACPI_FAILURE(status))
1371                 return -ENODEV;
1372
1373         switch (acpi_type) {
1374         case ACPI_TYPE_ANY:             /* for ACPI_ROOT_OBJECT */
1375         case ACPI_TYPE_DEVICE:
1376                 *type = ACPI_BUS_TYPE_DEVICE;
1377                 status = acpi_bus_get_status_handle(handle, sta);
1378                 if (ACPI_FAILURE(status))
1379                         return -ENODEV;
1380                 break;
1381         case ACPI_TYPE_PROCESSOR:
1382                 *type = ACPI_BUS_TYPE_PROCESSOR;
1383                 status = acpi_bus_get_status_handle(handle, sta);
1384                 if (ACPI_FAILURE(status))
1385                         return -ENODEV;
1386                 break;
1387         case ACPI_TYPE_THERMAL:
1388                 *type = ACPI_BUS_TYPE_THERMAL;
1389                 *sta = ACPI_STA_DEFAULT;
1390                 break;
1391         case ACPI_TYPE_POWER:
1392                 *type = ACPI_BUS_TYPE_POWER;
1393                 *sta = ACPI_STA_DEFAULT;
1394                 break;
1395         default:
1396                 return -ENODEV;
1397         }
1398
1399         return 0;
1400 }
1401
1402 static acpi_status acpi_bus_check_add(acpi_handle handle, u32 lvl,
1403                                       void *context, void **return_value)
1404 {
1405         struct acpi_bus_ops *ops = context;
1406         int type;
1407         unsigned long long sta;
1408         struct acpi_device *device;
1409         acpi_status status;
1410         int result;
1411
1412         result = acpi_bus_type_and_status(handle, &type, &sta);
1413         if (result)
1414                 return AE_OK;
1415
1416         if (!(sta & ACPI_STA_DEVICE_PRESENT) &&
1417             !(sta & ACPI_STA_DEVICE_FUNCTIONING)) {
1418                 struct acpi_device_wakeup wakeup;
1419                 acpi_handle temp;
1420
1421                 status = acpi_get_handle(handle, "_PRW", &temp);
1422                 if (ACPI_SUCCESS(status))
1423                         acpi_bus_extract_wakeup_device_power_package(handle,
1424                                                                      &wakeup);
1425                 return AE_CTRL_DEPTH;
1426         }
1427
1428         /*
1429          * We may already have an acpi_device from a previous enumeration.  If
1430          * so, we needn't add it again, but we may still have to start it.
1431          */
1432         device = NULL;
1433         acpi_bus_get_device(handle, &device);
1434         if (ops->acpi_op_add && !device)
1435                 acpi_add_single_object(&device, handle, type, sta, ops);
1436
1437         if (!device)
1438                 return AE_CTRL_DEPTH;
1439
1440         if (ops->acpi_op_start && !(ops->acpi_op_add)) {
1441                 status = acpi_start_single_object(device);
1442                 if (ACPI_FAILURE(status))
1443                         return AE_CTRL_DEPTH;
1444         }
1445
1446         if (!*return_value)
1447                 *return_value = device;
1448         return AE_OK;
1449 }
1450
1451 static int acpi_bus_scan(acpi_handle handle, struct acpi_bus_ops *ops,
1452                          struct acpi_device **child)
1453 {
1454         acpi_status status;
1455         void *device = NULL;
1456
1457         status = acpi_bus_check_add(handle, 0, ops, &device);
1458         if (ACPI_SUCCESS(status))
1459                 acpi_walk_namespace(ACPI_TYPE_ANY, handle, ACPI_UINT32_MAX,
1460                                     acpi_bus_check_add, NULL, ops, &device);
1461
1462         if (child)
1463                 *child = device;
1464
1465         if (device)
1466                 return 0;
1467         else
1468                 return -ENODEV;
1469 }
1470
1471 /*
1472  * acpi_bus_add and acpi_bus_start
1473  *
1474  * scan a given ACPI tree and (probably recently hot-plugged)
1475  * create and add or starts found devices.
1476  *
1477  * If no devices were found -ENODEV is returned which does not
1478  * mean that this is a real error, there just have been no suitable
1479  * ACPI objects in the table trunk from which the kernel could create
1480  * a device and add/start an appropriate driver.
1481  */
1482
1483 int
1484 acpi_bus_add(struct acpi_device **child,
1485              struct acpi_device *parent, acpi_handle handle, int type)
1486 {
1487         struct acpi_bus_ops ops;
1488
1489         memset(&ops, 0, sizeof(ops));
1490         ops.acpi_op_add = 1;
1491
1492         return acpi_bus_scan(handle, &ops, child);
1493 }
1494 EXPORT_SYMBOL(acpi_bus_add);
1495
1496 int acpi_bus_start(struct acpi_device *device)
1497 {
1498         struct acpi_bus_ops ops;
1499         int result;
1500
1501         if (!device)
1502                 return -EINVAL;
1503
1504         memset(&ops, 0, sizeof(ops));
1505         ops.acpi_op_start = 1;
1506
1507         result = acpi_bus_scan(device->handle, &ops, NULL);
1508
1509         acpi_update_all_gpes();
1510
1511         return result;
1512 }
1513 EXPORT_SYMBOL(acpi_bus_start);
1514
1515 int acpi_bus_trim(struct acpi_device *start, int rmdevice)
1516 {
1517         acpi_status status;
1518         struct acpi_device *parent, *child;
1519         acpi_handle phandle, chandle;
1520         acpi_object_type type;
1521         u32 level = 1;
1522         int err = 0;
1523
1524         parent = start;
1525         phandle = start->handle;
1526         child = chandle = NULL;
1527
1528         while ((level > 0) && parent && (!err)) {
1529                 status = acpi_get_next_object(ACPI_TYPE_ANY, phandle,
1530                                               chandle, &chandle);
1531
1532                 /*
1533                  * If this scope is exhausted then move our way back up.
1534                  */
1535                 if (ACPI_FAILURE(status)) {
1536                         level--;
1537                         chandle = phandle;
1538                         acpi_get_parent(phandle, &phandle);
1539                         child = parent;
1540                         parent = parent->parent;
1541
1542                         if (level == 0)
1543                                 err = acpi_bus_remove(child, rmdevice);
1544                         else
1545                                 err = acpi_bus_remove(child, 1);
1546
1547                         continue;
1548                 }
1549
1550                 status = acpi_get_type(chandle, &type);
1551                 if (ACPI_FAILURE(status)) {
1552                         continue;
1553                 }
1554                 /*
1555                  * If there is a device corresponding to chandle then
1556                  * parse it (depth-first).
1557                  */
1558                 if (acpi_bus_get_device(chandle, &child) == 0) {
1559                         level++;
1560                         phandle = chandle;
1561                         chandle = NULL;
1562                         parent = child;
1563                 }
1564                 continue;
1565         }
1566         return err;
1567 }
1568 EXPORT_SYMBOL_GPL(acpi_bus_trim);
1569
1570 static int acpi_bus_scan_fixed(void)
1571 {
1572         int result = 0;
1573         struct acpi_device *device = NULL;
1574         struct acpi_bus_ops ops;
1575
1576         memset(&ops, 0, sizeof(ops));
1577         ops.acpi_op_add = 1;
1578         ops.acpi_op_start = 1;
1579
1580         /*
1581          * Enumerate all fixed-feature devices.
1582          */
1583         if ((acpi_gbl_FADT.flags & ACPI_FADT_POWER_BUTTON) == 0) {
1584                 result = acpi_add_single_object(&device, NULL,
1585                                                 ACPI_BUS_TYPE_POWER_BUTTON,
1586                                                 ACPI_STA_DEFAULT,
1587                                                 &ops);
1588                 device_init_wakeup(&device->dev, true);
1589         }
1590
1591         if ((acpi_gbl_FADT.flags & ACPI_FADT_SLEEP_BUTTON) == 0) {
1592                 result = acpi_add_single_object(&device, NULL,
1593                                                 ACPI_BUS_TYPE_SLEEP_BUTTON,
1594                                                 ACPI_STA_DEFAULT,
1595                                                 &ops);
1596         }
1597
1598         return result;
1599 }
1600
1601 int __init acpi_scan_init(void)
1602 {
1603         int result;
1604         struct acpi_bus_ops ops;
1605
1606         memset(&ops, 0, sizeof(ops));
1607         ops.acpi_op_add = 1;
1608         ops.acpi_op_start = 1;
1609
1610         result = bus_register(&acpi_bus_type);
1611         if (result) {
1612                 /* We don't want to quit even if we failed to add suspend/resume */
1613                 printk(KERN_ERR PREFIX "Could not register bus type\n");
1614         }
1615
1616         acpi_power_init();
1617
1618         /*
1619          * Enumerate devices in the ACPI namespace.
1620          */
1621         result = acpi_bus_scan(ACPI_ROOT_OBJECT, &ops, &acpi_root);
1622
1623         if (!result)
1624                 result = acpi_bus_scan_fixed();
1625
1626         if (result)
1627                 acpi_device_unregister(acpi_root, ACPI_BUS_REMOVAL_NORMAL);
1628         else
1629                 acpi_update_all_gpes();
1630
1631         return result;
1632 }