ACPI / PM: Take order attribute of power resources into account
[linux-3.10.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 #include <linux/nls.h>
14
15 #include <acpi/acpi_drivers.h>
16
17 #include "internal.h"
18
19 #define _COMPONENT              ACPI_BUS_COMPONENT
20 ACPI_MODULE_NAME("scan");
21 #define STRUCT_TO_INT(s)        (*((int*)&s))
22 extern struct acpi_device *acpi_root;
23
24 #define ACPI_BUS_CLASS                  "system_bus"
25 #define ACPI_BUS_HID                    "LNXSYBUS"
26 #define ACPI_BUS_DEVICE_NAME            "System Bus"
27
28 #define ACPI_IS_ROOT_DEVICE(device)    (!(device)->parent)
29
30 static const char *dummy_hid = "device";
31
32 /*
33  * The following ACPI IDs are known to be suitable for representing as
34  * platform devices.
35  */
36 static const struct acpi_device_id acpi_platform_device_ids[] = {
37
38         { "PNP0D40" },
39
40         /* Haswell LPSS devices */
41         { "INT33C0", 0 },
42         { "INT33C1", 0 },
43         { "INT33C2", 0 },
44         { "INT33C3", 0 },
45         { "INT33C4", 0 },
46         { "INT33C5", 0 },
47         { "INT33C6", 0 },
48         { "INT33C7", 0 },
49
50         { }
51 };
52
53 static LIST_HEAD(acpi_device_list);
54 static LIST_HEAD(acpi_bus_id_list);
55 DEFINE_MUTEX(acpi_device_lock);
56 LIST_HEAD(acpi_wakeup_device_list);
57
58 struct acpi_device_bus_id{
59         char bus_id[15];
60         unsigned int instance_no;
61         struct list_head node;
62 };
63
64 /*
65  * Creates hid/cid(s) string needed for modalias and uevent
66  * e.g. on a device with hid:IBM0001 and cid:ACPI0001 you get:
67  * char *modalias: "acpi:IBM0001:ACPI0001"
68 */
69 static int create_modalias(struct acpi_device *acpi_dev, char *modalias,
70                            int size)
71 {
72         int len;
73         int count;
74         struct acpi_hardware_id *id;
75
76         if (list_empty(&acpi_dev->pnp.ids))
77                 return 0;
78
79         len = snprintf(modalias, size, "acpi:");
80         size -= len;
81
82         list_for_each_entry(id, &acpi_dev->pnp.ids, list) {
83                 count = snprintf(&modalias[len], size, "%s:", id->id);
84                 if (count < 0 || count >= size)
85                         return -EINVAL;
86                 len += count;
87                 size -= count;
88         }
89
90         modalias[len] = '\0';
91         return len;
92 }
93
94 static ssize_t
95 acpi_device_modalias_show(struct device *dev, struct device_attribute *attr, char *buf) {
96         struct acpi_device *acpi_dev = to_acpi_device(dev);
97         int len;
98
99         /* Device has no HID and no CID or string is >1024 */
100         len = create_modalias(acpi_dev, buf, 1024);
101         if (len <= 0)
102                 return 0;
103         buf[len++] = '\n';
104         return len;
105 }
106 static DEVICE_ATTR(modalias, 0444, acpi_device_modalias_show, NULL);
107
108 /**
109  * acpi_bus_hot_remove_device: hot-remove a device and its children
110  * @context: struct acpi_eject_event pointer (freed in this func)
111  *
112  * Hot-remove a device and its children. This function frees up the
113  * memory space passed by arg context, so that the caller may call
114  * this function asynchronously through acpi_os_hotplug_execute().
115  */
116 void acpi_bus_hot_remove_device(void *context)
117 {
118         struct acpi_eject_event *ej_event = (struct acpi_eject_event *) context;
119         struct acpi_device *device = ej_event->device;
120         acpi_handle handle = device->handle;
121         acpi_handle temp;
122         struct acpi_object_list arg_list;
123         union acpi_object arg;
124         acpi_status status = AE_OK;
125         u32 ost_code = ACPI_OST_SC_NON_SPECIFIC_FAILURE; /* default */
126
127         ACPI_DEBUG_PRINT((ACPI_DB_INFO,
128                 "Hot-removing device %s...\n", dev_name(&device->dev)));
129
130         if (acpi_bus_trim(device)) {
131                 printk(KERN_ERR PREFIX
132                                 "Removing device failed\n");
133                 goto err_out;
134         }
135
136         /* device has been freed */
137         device = NULL;
138
139         /* power off device */
140         status = acpi_evaluate_object(handle, "_PS3", NULL, NULL);
141         if (ACPI_FAILURE(status) && status != AE_NOT_FOUND)
142                 printk(KERN_WARNING PREFIX
143                                 "Power-off device failed\n");
144
145         if (ACPI_SUCCESS(acpi_get_handle(handle, "_LCK", &temp))) {
146                 arg_list.count = 1;
147                 arg_list.pointer = &arg;
148                 arg.type = ACPI_TYPE_INTEGER;
149                 arg.integer.value = 0;
150                 acpi_evaluate_object(handle, "_LCK", &arg_list, NULL);
151         }
152
153         arg_list.count = 1;
154         arg_list.pointer = &arg;
155         arg.type = ACPI_TYPE_INTEGER;
156         arg.integer.value = 1;
157
158         /*
159          * TBD: _EJD support.
160          */
161         status = acpi_evaluate_object(handle, "_EJ0", &arg_list, NULL);
162         if (ACPI_FAILURE(status)) {
163                 if (status != AE_NOT_FOUND)
164                         printk(KERN_WARNING PREFIX
165                                         "Eject device failed\n");
166                 goto err_out;
167         }
168
169         kfree(context);
170         return;
171
172 err_out:
173         /* Inform firmware the hot-remove operation has completed w/ error */
174         (void) acpi_evaluate_hotplug_ost(handle,
175                                 ej_event->event, ost_code, NULL);
176         kfree(context);
177         return;
178 }
179 EXPORT_SYMBOL(acpi_bus_hot_remove_device);
180
181 static ssize_t
182 acpi_eject_store(struct device *d, struct device_attribute *attr,
183                 const char *buf, size_t count)
184 {
185         int ret = count;
186         acpi_status status;
187         acpi_object_type type = 0;
188         struct acpi_device *acpi_device = to_acpi_device(d);
189         struct acpi_eject_event *ej_event;
190
191         if ((!count) || (buf[0] != '1')) {
192                 return -EINVAL;
193         }
194 #ifndef FORCE_EJECT
195         if (acpi_device->driver == NULL) {
196                 ret = -ENODEV;
197                 goto err;
198         }
199 #endif
200         status = acpi_get_type(acpi_device->handle, &type);
201         if (ACPI_FAILURE(status) || (!acpi_device->flags.ejectable)) {
202                 ret = -ENODEV;
203                 goto err;
204         }
205
206         ej_event = kmalloc(sizeof(*ej_event), GFP_KERNEL);
207         if (!ej_event) {
208                 ret = -ENOMEM;
209                 goto err;
210         }
211
212         ej_event->device = acpi_device;
213         if (acpi_device->flags.eject_pending) {
214                 /* event originated from ACPI eject notification */
215                 ej_event->event = ACPI_NOTIFY_EJECT_REQUEST;
216                 acpi_device->flags.eject_pending = 0;
217         } else {
218                 /* event originated from user */
219                 ej_event->event = ACPI_OST_EC_OSPM_EJECT;
220                 (void) acpi_evaluate_hotplug_ost(acpi_device->handle,
221                         ej_event->event, ACPI_OST_SC_EJECT_IN_PROGRESS, NULL);
222         }
223
224         acpi_os_hotplug_execute(acpi_bus_hot_remove_device, (void *)ej_event);
225 err:
226         return ret;
227 }
228
229 static DEVICE_ATTR(eject, 0200, NULL, acpi_eject_store);
230
231 static ssize_t
232 acpi_device_hid_show(struct device *dev, struct device_attribute *attr, char *buf) {
233         struct acpi_device *acpi_dev = to_acpi_device(dev);
234
235         return sprintf(buf, "%s\n", acpi_device_hid(acpi_dev));
236 }
237 static DEVICE_ATTR(hid, 0444, acpi_device_hid_show, NULL);
238
239 static ssize_t acpi_device_uid_show(struct device *dev,
240                                     struct device_attribute *attr, char *buf)
241 {
242         struct acpi_device *acpi_dev = to_acpi_device(dev);
243
244         return sprintf(buf, "%s\n", acpi_dev->pnp.unique_id);
245 }
246 static DEVICE_ATTR(uid, 0444, acpi_device_uid_show, NULL);
247
248 static ssize_t acpi_device_adr_show(struct device *dev,
249                                     struct device_attribute *attr, char *buf)
250 {
251         struct acpi_device *acpi_dev = to_acpi_device(dev);
252
253         return sprintf(buf, "0x%08x\n",
254                        (unsigned int)(acpi_dev->pnp.bus_address));
255 }
256 static DEVICE_ATTR(adr, 0444, acpi_device_adr_show, NULL);
257
258 static ssize_t
259 acpi_device_path_show(struct device *dev, struct device_attribute *attr, char *buf) {
260         struct acpi_device *acpi_dev = to_acpi_device(dev);
261         struct acpi_buffer path = {ACPI_ALLOCATE_BUFFER, NULL};
262         int result;
263
264         result = acpi_get_name(acpi_dev->handle, ACPI_FULL_PATHNAME, &path);
265         if (result)
266                 goto end;
267
268         result = sprintf(buf, "%s\n", (char*)path.pointer);
269         kfree(path.pointer);
270 end:
271         return result;
272 }
273 static DEVICE_ATTR(path, 0444, acpi_device_path_show, NULL);
274
275 /* sysfs file that shows description text from the ACPI _STR method */
276 static ssize_t description_show(struct device *dev,
277                                 struct device_attribute *attr,
278                                 char *buf) {
279         struct acpi_device *acpi_dev = to_acpi_device(dev);
280         int result;
281
282         if (acpi_dev->pnp.str_obj == NULL)
283                 return 0;
284
285         /*
286          * The _STR object contains a Unicode identifier for a device.
287          * We need to convert to utf-8 so it can be displayed.
288          */
289         result = utf16s_to_utf8s(
290                 (wchar_t *)acpi_dev->pnp.str_obj->buffer.pointer,
291                 acpi_dev->pnp.str_obj->buffer.length,
292                 UTF16_LITTLE_ENDIAN, buf,
293                 PAGE_SIZE);
294
295         buf[result++] = '\n';
296
297         return result;
298 }
299 static DEVICE_ATTR(description, 0444, description_show, NULL);
300
301 static ssize_t
302 acpi_device_sun_show(struct device *dev, struct device_attribute *attr,
303                      char *buf) {
304         struct acpi_device *acpi_dev = to_acpi_device(dev);
305
306         return sprintf(buf, "%lu\n", acpi_dev->pnp.sun);
307 }
308 static DEVICE_ATTR(sun, 0444, acpi_device_sun_show, NULL);
309
310 static int acpi_device_setup_files(struct acpi_device *dev)
311 {
312         struct acpi_buffer buffer = {ACPI_ALLOCATE_BUFFER, NULL};
313         acpi_status status;
314         acpi_handle temp;
315         unsigned long long sun;
316         int result = 0;
317
318         /*
319          * Devices gotten from FADT don't have a "path" attribute
320          */
321         if (dev->handle) {
322                 result = device_create_file(&dev->dev, &dev_attr_path);
323                 if (result)
324                         goto end;
325         }
326
327         if (!list_empty(&dev->pnp.ids)) {
328                 result = device_create_file(&dev->dev, &dev_attr_hid);
329                 if (result)
330                         goto end;
331
332                 result = device_create_file(&dev->dev, &dev_attr_modalias);
333                 if (result)
334                         goto end;
335         }
336
337         /*
338          * If device has _STR, 'description' file is created
339          */
340         status = acpi_get_handle(dev->handle, "_STR", &temp);
341         if (ACPI_SUCCESS(status)) {
342                 status = acpi_evaluate_object(dev->handle, "_STR",
343                                         NULL, &buffer);
344                 if (ACPI_FAILURE(status))
345                         buffer.pointer = NULL;
346                 dev->pnp.str_obj = buffer.pointer;
347                 result = device_create_file(&dev->dev, &dev_attr_description);
348                 if (result)
349                         goto end;
350         }
351
352         if (dev->flags.bus_address)
353                 result = device_create_file(&dev->dev, &dev_attr_adr);
354         if (dev->pnp.unique_id)
355                 result = device_create_file(&dev->dev, &dev_attr_uid);
356
357         status = acpi_evaluate_integer(dev->handle, "_SUN", NULL, &sun);
358         if (ACPI_SUCCESS(status)) {
359                 dev->pnp.sun = (unsigned long)sun;
360                 result = device_create_file(&dev->dev, &dev_attr_sun);
361                 if (result)
362                         goto end;
363         } else {
364                 dev->pnp.sun = (unsigned long)-1;
365         }
366
367         /*
368          * If device has _EJ0, 'eject' file is created that is used to trigger
369          * hot-removal function from userland.
370          */
371         status = acpi_get_handle(dev->handle, "_EJ0", &temp);
372         if (ACPI_SUCCESS(status))
373                 result = device_create_file(&dev->dev, &dev_attr_eject);
374 end:
375         return result;
376 }
377
378 static void acpi_device_remove_files(struct acpi_device *dev)
379 {
380         acpi_status status;
381         acpi_handle temp;
382
383         /*
384          * If device has _STR, remove 'description' file
385          */
386         status = acpi_get_handle(dev->handle, "_STR", &temp);
387         if (ACPI_SUCCESS(status)) {
388                 kfree(dev->pnp.str_obj);
389                 device_remove_file(&dev->dev, &dev_attr_description);
390         }
391         /*
392          * If device has _EJ0, remove 'eject' file.
393          */
394         status = acpi_get_handle(dev->handle, "_EJ0", &temp);
395         if (ACPI_SUCCESS(status))
396                 device_remove_file(&dev->dev, &dev_attr_eject);
397
398         status = acpi_get_handle(dev->handle, "_SUN", &temp);
399         if (ACPI_SUCCESS(status))
400                 device_remove_file(&dev->dev, &dev_attr_sun);
401
402         if (dev->pnp.unique_id)
403                 device_remove_file(&dev->dev, &dev_attr_uid);
404         if (dev->flags.bus_address)
405                 device_remove_file(&dev->dev, &dev_attr_adr);
406         device_remove_file(&dev->dev, &dev_attr_modalias);
407         device_remove_file(&dev->dev, &dev_attr_hid);
408         if (dev->handle)
409                 device_remove_file(&dev->dev, &dev_attr_path);
410 }
411 /* --------------------------------------------------------------------------
412                         ACPI Bus operations
413    -------------------------------------------------------------------------- */
414
415 static const struct acpi_device_id *__acpi_match_device(
416         struct acpi_device *device, const struct acpi_device_id *ids)
417 {
418         const struct acpi_device_id *id;
419         struct acpi_hardware_id *hwid;
420
421         /*
422          * If the device is not present, it is unnecessary to load device
423          * driver for it.
424          */
425         if (!device->status.present)
426                 return NULL;
427
428         for (id = ids; id->id[0]; id++)
429                 list_for_each_entry(hwid, &device->pnp.ids, list)
430                         if (!strcmp((char *) id->id, hwid->id))
431                                 return id;
432
433         return NULL;
434 }
435
436 /**
437  * acpi_match_device - Match a struct device against a given list of ACPI IDs
438  * @ids: Array of struct acpi_device_id object to match against.
439  * @dev: The device structure to match.
440  *
441  * Check if @dev has a valid ACPI handle and if there is a struct acpi_device
442  * object for that handle and use that object to match against a given list of
443  * device IDs.
444  *
445  * Return a pointer to the first matching ID on success or %NULL on failure.
446  */
447 const struct acpi_device_id *acpi_match_device(const struct acpi_device_id *ids,
448                                                const struct device *dev)
449 {
450         struct acpi_device *adev;
451
452         if (!ids || !ACPI_HANDLE(dev)
453             || ACPI_FAILURE(acpi_bus_get_device(ACPI_HANDLE(dev), &adev)))
454                 return NULL;
455
456         return __acpi_match_device(adev, ids);
457 }
458 EXPORT_SYMBOL_GPL(acpi_match_device);
459
460 int acpi_match_device_ids(struct acpi_device *device,
461                           const struct acpi_device_id *ids)
462 {
463         return __acpi_match_device(device, ids) ? 0 : -ENOENT;
464 }
465 EXPORT_SYMBOL(acpi_match_device_ids);
466
467 void acpi_free_ids(struct acpi_device *device)
468 {
469         struct acpi_hardware_id *id, *tmp;
470
471         list_for_each_entry_safe(id, tmp, &device->pnp.ids, list) {
472                 kfree(id->id);
473                 kfree(id);
474         }
475         kfree(device->pnp.unique_id);
476 }
477
478 static void acpi_free_power_resources_lists(struct acpi_device *device)
479 {
480         int i;
481
482         if (!device->flags.power_manageable)
483                 return;
484
485         for (i = ACPI_STATE_D0; i <= ACPI_STATE_D3_HOT; i++) {
486                 struct acpi_device_power_state *ps = &device->power.states[i];
487                 acpi_power_resources_list_free(&ps->resources);
488         }
489 }
490
491 static void acpi_device_release(struct device *dev)
492 {
493         struct acpi_device *acpi_dev = to_acpi_device(dev);
494
495         acpi_free_ids(acpi_dev);
496         acpi_free_power_resources_lists(acpi_dev);
497         kfree(acpi_dev);
498 }
499
500 static int acpi_bus_match(struct device *dev, struct device_driver *drv)
501 {
502         struct acpi_device *acpi_dev = to_acpi_device(dev);
503         struct acpi_driver *acpi_drv = to_acpi_driver(drv);
504
505         return acpi_dev->flags.match_driver
506                 && !acpi_match_device_ids(acpi_dev, acpi_drv->ids);
507 }
508
509 static int acpi_device_uevent(struct device *dev, struct kobj_uevent_env *env)
510 {
511         struct acpi_device *acpi_dev = to_acpi_device(dev);
512         int len;
513
514         if (list_empty(&acpi_dev->pnp.ids))
515                 return 0;
516
517         if (add_uevent_var(env, "MODALIAS="))
518                 return -ENOMEM;
519         len = create_modalias(acpi_dev, &env->buf[env->buflen - 1],
520                               sizeof(env->buf) - env->buflen);
521         if (len >= (sizeof(env->buf) - env->buflen))
522                 return -ENOMEM;
523         env->buflen += len;
524         return 0;
525 }
526
527 static void acpi_device_notify(acpi_handle handle, u32 event, void *data)
528 {
529         struct acpi_device *device = data;
530
531         device->driver->ops.notify(device, event);
532 }
533
534 static acpi_status acpi_device_notify_fixed(void *data)
535 {
536         struct acpi_device *device = data;
537
538         /* Fixed hardware devices have no handles */
539         acpi_device_notify(NULL, ACPI_FIXED_HARDWARE_EVENT, device);
540         return AE_OK;
541 }
542
543 static int acpi_device_install_notify_handler(struct acpi_device *device)
544 {
545         acpi_status status;
546
547         if (device->device_type == ACPI_BUS_TYPE_POWER_BUTTON)
548                 status =
549                     acpi_install_fixed_event_handler(ACPI_EVENT_POWER_BUTTON,
550                                                      acpi_device_notify_fixed,
551                                                      device);
552         else if (device->device_type == ACPI_BUS_TYPE_SLEEP_BUTTON)
553                 status =
554                     acpi_install_fixed_event_handler(ACPI_EVENT_SLEEP_BUTTON,
555                                                      acpi_device_notify_fixed,
556                                                      device);
557         else
558                 status = acpi_install_notify_handler(device->handle,
559                                                      ACPI_DEVICE_NOTIFY,
560                                                      acpi_device_notify,
561                                                      device);
562
563         if (ACPI_FAILURE(status))
564                 return -EINVAL;
565         return 0;
566 }
567
568 static void acpi_device_remove_notify_handler(struct acpi_device *device)
569 {
570         if (device->device_type == ACPI_BUS_TYPE_POWER_BUTTON)
571                 acpi_remove_fixed_event_handler(ACPI_EVENT_POWER_BUTTON,
572                                                 acpi_device_notify_fixed);
573         else if (device->device_type == ACPI_BUS_TYPE_SLEEP_BUTTON)
574                 acpi_remove_fixed_event_handler(ACPI_EVENT_SLEEP_BUTTON,
575                                                 acpi_device_notify_fixed);
576         else
577                 acpi_remove_notify_handler(device->handle, ACPI_DEVICE_NOTIFY,
578                                            acpi_device_notify);
579 }
580
581 static int acpi_bus_driver_init(struct acpi_device *, struct acpi_driver *);
582 static int acpi_device_probe(struct device * dev)
583 {
584         struct acpi_device *acpi_dev = to_acpi_device(dev);
585         struct acpi_driver *acpi_drv = to_acpi_driver(dev->driver);
586         int ret;
587
588         ret = acpi_bus_driver_init(acpi_dev, acpi_drv);
589         if (!ret) {
590                 if (acpi_drv->ops.notify) {
591                         ret = acpi_device_install_notify_handler(acpi_dev);
592                         if (ret) {
593                                 if (acpi_drv->ops.remove)
594                                         acpi_drv->ops.remove(acpi_dev,
595                                                      acpi_dev->removal_type);
596                                 return ret;
597                         }
598                 }
599
600                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
601                         "Found driver [%s] for device [%s]\n",
602                         acpi_drv->name, acpi_dev->pnp.bus_id));
603                 get_device(dev);
604         }
605         return ret;
606 }
607
608 static int acpi_device_remove(struct device * dev)
609 {
610         struct acpi_device *acpi_dev = to_acpi_device(dev);
611         struct acpi_driver *acpi_drv = acpi_dev->driver;
612
613         if (acpi_drv) {
614                 if (acpi_drv->ops.notify)
615                         acpi_device_remove_notify_handler(acpi_dev);
616                 if (acpi_drv->ops.remove)
617                         acpi_drv->ops.remove(acpi_dev, acpi_dev->removal_type);
618         }
619         acpi_dev->driver = NULL;
620         acpi_dev->driver_data = NULL;
621
622         put_device(dev);
623         return 0;
624 }
625
626 struct bus_type acpi_bus_type = {
627         .name           = "acpi",
628         .match          = acpi_bus_match,
629         .probe          = acpi_device_probe,
630         .remove         = acpi_device_remove,
631         .uevent         = acpi_device_uevent,
632 };
633
634 int acpi_device_register(struct acpi_device *device,
635                          void (*release)(struct device *))
636 {
637         int result;
638         struct acpi_device_bus_id *acpi_device_bus_id, *new_bus_id;
639         int found = 0;
640
641         if (device->handle) {
642                 acpi_status status;
643
644                 status = acpi_attach_data(device->handle, acpi_bus_data_handler,
645                                           device);
646                 if (ACPI_FAILURE(status)) {
647                         acpi_handle_err(device->handle,
648                                         "Unable to attach device data\n");
649                         return -ENODEV;
650                 }
651         }
652
653         /*
654          * Linkage
655          * -------
656          * Link this device to its parent and siblings.
657          */
658         INIT_LIST_HEAD(&device->children);
659         INIT_LIST_HEAD(&device->node);
660         INIT_LIST_HEAD(&device->wakeup_list);
661         INIT_LIST_HEAD(&device->physical_node_list);
662         mutex_init(&device->physical_node_lock);
663         INIT_LIST_HEAD(&device->power_dependent);
664
665         new_bus_id = kzalloc(sizeof(struct acpi_device_bus_id), GFP_KERNEL);
666         if (!new_bus_id) {
667                 pr_err(PREFIX "Memory allocation error\n");
668                 result = -ENOMEM;
669                 goto err_detach;
670         }
671
672         mutex_lock(&acpi_device_lock);
673         /*
674          * Find suitable bus_id and instance number in acpi_bus_id_list
675          * If failed, create one and link it into acpi_bus_id_list
676          */
677         list_for_each_entry(acpi_device_bus_id, &acpi_bus_id_list, node) {
678                 if (!strcmp(acpi_device_bus_id->bus_id,
679                             acpi_device_hid(device))) {
680                         acpi_device_bus_id->instance_no++;
681                         found = 1;
682                         kfree(new_bus_id);
683                         break;
684                 }
685         }
686         if (!found) {
687                 acpi_device_bus_id = new_bus_id;
688                 strcpy(acpi_device_bus_id->bus_id, acpi_device_hid(device));
689                 acpi_device_bus_id->instance_no = 0;
690                 list_add_tail(&acpi_device_bus_id->node, &acpi_bus_id_list);
691         }
692         dev_set_name(&device->dev, "%s:%02x", acpi_device_bus_id->bus_id, acpi_device_bus_id->instance_no);
693
694         if (device->parent)
695                 list_add_tail(&device->node, &device->parent->children);
696
697         if (device->wakeup.flags.valid)
698                 list_add_tail(&device->wakeup_list, &acpi_wakeup_device_list);
699         mutex_unlock(&acpi_device_lock);
700
701         if (device->parent)
702                 device->dev.parent = &device->parent->dev;
703         device->dev.bus = &acpi_bus_type;
704         device->dev.release = release;
705         result = device_register(&device->dev);
706         if (result) {
707                 dev_err(&device->dev, "Error registering device\n");
708                 goto err;
709         }
710
711         result = acpi_device_setup_files(device);
712         if (result)
713                 printk(KERN_ERR PREFIX "Error creating sysfs interface for device %s\n",
714                        dev_name(&device->dev));
715
716         device->removal_type = ACPI_BUS_REMOVAL_NORMAL;
717         return 0;
718
719  err:
720         mutex_lock(&acpi_device_lock);
721         if (device->parent)
722                 list_del(&device->node);
723         list_del(&device->wakeup_list);
724         mutex_unlock(&acpi_device_lock);
725
726  err_detach:
727         acpi_detach_data(device->handle, acpi_bus_data_handler);
728         return result;
729 }
730
731 static void acpi_device_unregister(struct acpi_device *device)
732 {
733         mutex_lock(&acpi_device_lock);
734         if (device->parent)
735                 list_del(&device->node);
736
737         list_del(&device->wakeup_list);
738         mutex_unlock(&acpi_device_lock);
739
740         acpi_detach_data(device->handle, acpi_bus_data_handler);
741
742         acpi_power_add_remove_device(device, false);
743         acpi_device_remove_files(device);
744         device_unregister(&device->dev);
745         /*
746          * Drop the reference counts of all power resources the device depends
747          * on and turn off the ones that have no more references.
748          */
749         acpi_power_transition(device, ACPI_STATE_D3_COLD);
750 }
751
752 /* --------------------------------------------------------------------------
753                                  Driver Management
754    -------------------------------------------------------------------------- */
755 /**
756  * acpi_bus_driver_init - add a device to a driver
757  * @device: the device to add and initialize
758  * @driver: driver for the device
759  *
760  * Used to initialize a device via its device driver.  Called whenever a
761  * driver is bound to a device.  Invokes the driver's add() ops.
762  */
763 static int
764 acpi_bus_driver_init(struct acpi_device *device, struct acpi_driver *driver)
765 {
766         int result = 0;
767
768         if (!device || !driver)
769                 return -EINVAL;
770
771         if (!driver->ops.add)
772                 return -ENOSYS;
773
774         result = driver->ops.add(device);
775         if (result) {
776                 device->driver = NULL;
777                 device->driver_data = NULL;
778                 return result;
779         }
780
781         device->driver = driver;
782
783         /*
784          * TBD - Configuration Management: Assign resources to device based
785          * upon possible configuration and currently allocated resources.
786          */
787
788         ACPI_DEBUG_PRINT((ACPI_DB_INFO,
789                           "Driver successfully bound to device\n"));
790         return 0;
791 }
792
793 /**
794  * acpi_bus_register_driver - register a driver with the ACPI bus
795  * @driver: driver being registered
796  *
797  * Registers a driver with the ACPI bus.  Searches the namespace for all
798  * devices that match the driver's criteria and binds.  Returns zero for
799  * success or a negative error status for failure.
800  */
801 int acpi_bus_register_driver(struct acpi_driver *driver)
802 {
803         int ret;
804
805         if (acpi_disabled)
806                 return -ENODEV;
807         driver->drv.name = driver->name;
808         driver->drv.bus = &acpi_bus_type;
809         driver->drv.owner = driver->owner;
810
811         ret = driver_register(&driver->drv);
812         return ret;
813 }
814
815 EXPORT_SYMBOL(acpi_bus_register_driver);
816
817 /**
818  * acpi_bus_unregister_driver - unregisters a driver with the APIC bus
819  * @driver: driver to unregister
820  *
821  * Unregisters a driver with the ACPI bus.  Searches the namespace for all
822  * devices that match the driver's criteria and unbinds.
823  */
824 void acpi_bus_unregister_driver(struct acpi_driver *driver)
825 {
826         driver_unregister(&driver->drv);
827 }
828
829 EXPORT_SYMBOL(acpi_bus_unregister_driver);
830
831 /* --------------------------------------------------------------------------
832                                  Device Enumeration
833    -------------------------------------------------------------------------- */
834 static struct acpi_device *acpi_bus_get_parent(acpi_handle handle)
835 {
836         acpi_status status;
837         int ret;
838         struct acpi_device *device;
839
840         /*
841          * Fixed hardware devices do not appear in the namespace and do not
842          * have handles, but we fabricate acpi_devices for them, so we have
843          * to deal with them specially.
844          */
845         if (handle == NULL)
846                 return acpi_root;
847
848         do {
849                 status = acpi_get_parent(handle, &handle);
850                 if (status == AE_NULL_ENTRY)
851                         return NULL;
852                 if (ACPI_FAILURE(status))
853                         return acpi_root;
854
855                 ret = acpi_bus_get_device(handle, &device);
856                 if (ret == 0)
857                         return device;
858         } while (1);
859 }
860
861 acpi_status
862 acpi_bus_get_ejd(acpi_handle handle, acpi_handle *ejd)
863 {
864         acpi_status status;
865         acpi_handle tmp;
866         struct acpi_buffer buffer = {ACPI_ALLOCATE_BUFFER, NULL};
867         union acpi_object *obj;
868
869         status = acpi_get_handle(handle, "_EJD", &tmp);
870         if (ACPI_FAILURE(status))
871                 return status;
872
873         status = acpi_evaluate_object(handle, "_EJD", NULL, &buffer);
874         if (ACPI_SUCCESS(status)) {
875                 obj = buffer.pointer;
876                 status = acpi_get_handle(ACPI_ROOT_OBJECT, obj->string.pointer,
877                                          ejd);
878                 kfree(buffer.pointer);
879         }
880         return status;
881 }
882 EXPORT_SYMBOL_GPL(acpi_bus_get_ejd);
883
884 void acpi_bus_data_handler(acpi_handle handle, void *context)
885 {
886
887         /* TBD */
888
889         return;
890 }
891
892 static acpi_status
893 acpi_bus_extract_wakeup_device_power_package(acpi_handle handle,
894                                              struct acpi_device_wakeup *wakeup)
895 {
896         struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
897         union acpi_object *package = NULL;
898         union acpi_object *element = NULL;
899         acpi_status status;
900         int i = 0;
901
902         if (!wakeup)
903                 return AE_BAD_PARAMETER;
904
905         /* _PRW */
906         status = acpi_evaluate_object(handle, "_PRW", NULL, &buffer);
907         if (ACPI_FAILURE(status)) {
908                 ACPI_EXCEPTION((AE_INFO, status, "Evaluating _PRW"));
909                 return status;
910         }
911
912         package = (union acpi_object *)buffer.pointer;
913
914         if (!package || (package->package.count < 2)) {
915                 status = AE_BAD_DATA;
916                 goto out;
917         }
918
919         element = &(package->package.elements[0]);
920         if (!element) {
921                 status = AE_BAD_DATA;
922                 goto out;
923         }
924         if (element->type == ACPI_TYPE_PACKAGE) {
925                 if ((element->package.count < 2) ||
926                     (element->package.elements[0].type !=
927                      ACPI_TYPE_LOCAL_REFERENCE)
928                     || (element->package.elements[1].type != ACPI_TYPE_INTEGER)) {
929                         status = AE_BAD_DATA;
930                         goto out;
931                 }
932                 wakeup->gpe_device =
933                     element->package.elements[0].reference.handle;
934                 wakeup->gpe_number =
935                     (u32) element->package.elements[1].integer.value;
936         } else if (element->type == ACPI_TYPE_INTEGER) {
937                 wakeup->gpe_device = NULL;
938                 wakeup->gpe_number = element->integer.value;
939         } else {
940                 status = AE_BAD_DATA;
941                 goto out;
942         }
943
944         element = &(package->package.elements[1]);
945         if (element->type != ACPI_TYPE_INTEGER) {
946                 status = AE_BAD_DATA;
947                 goto out;
948         }
949         wakeup->sleep_state = element->integer.value;
950
951         if ((package->package.count - 2) > ACPI_MAX_HANDLES) {
952                 status = AE_NO_MEMORY;
953                 goto out;
954         }
955         wakeup->resources.count = package->package.count - 2;
956         for (i = 0; i < wakeup->resources.count; i++) {
957                 element = &(package->package.elements[i + 2]);
958                 if (element->type != ACPI_TYPE_LOCAL_REFERENCE) {
959                         status = AE_BAD_DATA;
960                         goto out;
961                 }
962
963                 wakeup->resources.handles[i] = element->reference.handle;
964         }
965
966         acpi_setup_gpe_for_wake(handle, wakeup->gpe_device, wakeup->gpe_number);
967
968  out:
969         kfree(buffer.pointer);
970
971         return status;
972 }
973
974 static void acpi_bus_set_run_wake_flags(struct acpi_device *device)
975 {
976         struct acpi_device_id button_device_ids[] = {
977                 {"PNP0C0C", 0},
978                 {"PNP0C0D", 0},
979                 {"PNP0C0E", 0},
980                 {"", 0},
981         };
982         acpi_status status;
983         acpi_event_status event_status;
984
985         device->wakeup.flags.notifier_present = 0;
986
987         /* Power button, Lid switch always enable wakeup */
988         if (!acpi_match_device_ids(device, button_device_ids)) {
989                 device->wakeup.flags.run_wake = 1;
990                 if (!acpi_match_device_ids(device, &button_device_ids[1])) {
991                         /* Do not use Lid/sleep button for S5 wakeup */
992                         if (device->wakeup.sleep_state == ACPI_STATE_S5)
993                                 device->wakeup.sleep_state = ACPI_STATE_S4;
994                 }
995                 device_set_wakeup_capable(&device->dev, true);
996                 return;
997         }
998
999         status = acpi_get_gpe_status(device->wakeup.gpe_device,
1000                                         device->wakeup.gpe_number,
1001                                                 &event_status);
1002         if (status == AE_OK)
1003                 device->wakeup.flags.run_wake =
1004                                 !!(event_status & ACPI_EVENT_FLAG_HANDLE);
1005 }
1006
1007 static void acpi_bus_get_wakeup_device_flags(struct acpi_device *device)
1008 {
1009         acpi_handle temp;
1010         acpi_status status = 0;
1011         int psw_error;
1012
1013         /* Presence of _PRW indicates wake capable */
1014         status = acpi_get_handle(device->handle, "_PRW", &temp);
1015         if (ACPI_FAILURE(status))
1016                 return;
1017
1018         status = acpi_bus_extract_wakeup_device_power_package(device->handle,
1019                                                               &device->wakeup);
1020         if (ACPI_FAILURE(status)) {
1021                 ACPI_EXCEPTION((AE_INFO, status, "Extracting _PRW package"));
1022                 return;
1023         }
1024
1025         device->wakeup.flags.valid = 1;
1026         device->wakeup.prepare_count = 0;
1027         acpi_bus_set_run_wake_flags(device);
1028         /* Call _PSW/_DSW object to disable its ability to wake the sleeping
1029          * system for the ACPI device with the _PRW object.
1030          * The _PSW object is depreciated in ACPI 3.0 and is replaced by _DSW.
1031          * So it is necessary to call _DSW object first. Only when it is not
1032          * present will the _PSW object used.
1033          */
1034         psw_error = acpi_device_sleep_wake(device, 0, 0, 0);
1035         if (psw_error)
1036                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
1037                                 "error in _DSW or _PSW evaluation\n"));
1038 }
1039
1040 static void acpi_bus_get_power_flags(struct acpi_device *device)
1041 {
1042         acpi_status status = 0;
1043         acpi_handle handle = NULL;
1044         u32 i = 0;
1045
1046         /* Presence of _PS0|_PR0 indicates 'power manageable' */
1047         status = acpi_get_handle(device->handle, "_PS0", &handle);
1048         if (ACPI_FAILURE(status)) {
1049                 status = acpi_get_handle(device->handle, "_PR0", &handle);
1050                 if (ACPI_FAILURE(status))
1051                         return;
1052         }
1053
1054         device->flags.power_manageable = 1;
1055
1056         /*
1057          * Power Management Flags
1058          */
1059         status = acpi_get_handle(device->handle, "_PSC", &handle);
1060         if (ACPI_SUCCESS(status))
1061                 device->power.flags.explicit_get = 1;
1062         status = acpi_get_handle(device->handle, "_IRC", &handle);
1063         if (ACPI_SUCCESS(status))
1064                 device->power.flags.inrush_current = 1;
1065
1066         /*
1067          * Enumerate supported power management states
1068          */
1069         for (i = ACPI_STATE_D0; i <= ACPI_STATE_D3_HOT; i++) {
1070                 struct acpi_device_power_state *ps = &device->power.states[i];
1071                 char object_name[5] = { '_', 'P', 'R', '0' + i, '\0' };
1072                 struct acpi_handle_list resources;
1073
1074                 INIT_LIST_HEAD(&ps->resources);
1075                 /* Evaluate "_PRx" to se if power resources are referenced */
1076                 acpi_evaluate_reference(device->handle, object_name, NULL,
1077                                         &resources);
1078                 if (resources.count) {
1079                         int j;
1080
1081                         device->power.flags.power_resources = 1;
1082                         for (j = 0; j < resources.count; j++) {
1083                                 acpi_handle rhandle = resources.handles[j];
1084
1085                                 acpi_add_power_resource(rhandle);
1086                                 acpi_power_resources_list_add(rhandle,
1087                                                               &ps->resources);
1088                         }
1089                 }
1090
1091                 /* Evaluate "_PSx" to see if we can do explicit sets */
1092                 object_name[2] = 'S';
1093                 status = acpi_get_handle(device->handle, object_name, &handle);
1094                 if (ACPI_SUCCESS(status))
1095                         ps->flags.explicit_set = 1;
1096
1097                 /*
1098                  * State is valid if there are means to put the device into it.
1099                  * D3hot is only valid if _PR3 present.
1100                  */
1101                 if (resources.count ||
1102                     (ps->flags.explicit_set && i < ACPI_STATE_D3_HOT)) {
1103                         ps->flags.valid = 1;
1104                         ps->flags.os_accessible = 1;
1105                 }
1106
1107                 ps->power = -1; /* Unknown - driver assigned */
1108                 ps->latency = -1;       /* Unknown - driver assigned */
1109         }
1110
1111         INIT_LIST_HEAD(&device->power.states[ACPI_STATE_D3_COLD].resources);
1112
1113         /* Set defaults for D0 and D3 states (always valid) */
1114         device->power.states[ACPI_STATE_D0].flags.valid = 1;
1115         device->power.states[ACPI_STATE_D0].power = 100;
1116         device->power.states[ACPI_STATE_D3].flags.valid = 1;
1117         device->power.states[ACPI_STATE_D3].power = 0;
1118
1119         /* Set D3cold's explicit_set flag if _PS3 exists. */
1120         if (device->power.states[ACPI_STATE_D3_HOT].flags.explicit_set)
1121                 device->power.states[ACPI_STATE_D3_COLD].flags.explicit_set = 1;
1122
1123         /* Presence of _PS3 or _PRx means we can put the device into D3 cold */
1124         if (device->power.states[ACPI_STATE_D3_HOT].flags.explicit_set ||
1125                         device->power.flags.power_resources)
1126                 device->power.states[ACPI_STATE_D3_COLD].flags.os_accessible = 1;
1127
1128         acpi_bus_init_power(device);
1129 }
1130
1131 static void acpi_bus_get_flags(struct acpi_device *device)
1132 {
1133         acpi_status status = AE_OK;
1134         acpi_handle temp = NULL;
1135
1136         /* Presence of _STA indicates 'dynamic_status' */
1137         status = acpi_get_handle(device->handle, "_STA", &temp);
1138         if (ACPI_SUCCESS(status))
1139                 device->flags.dynamic_status = 1;
1140
1141         /* Presence of _RMV indicates 'removable' */
1142         status = acpi_get_handle(device->handle, "_RMV", &temp);
1143         if (ACPI_SUCCESS(status))
1144                 device->flags.removable = 1;
1145
1146         /* Presence of _EJD|_EJ0 indicates 'ejectable' */
1147         status = acpi_get_handle(device->handle, "_EJD", &temp);
1148         if (ACPI_SUCCESS(status))
1149                 device->flags.ejectable = 1;
1150         else {
1151                 status = acpi_get_handle(device->handle, "_EJ0", &temp);
1152                 if (ACPI_SUCCESS(status))
1153                         device->flags.ejectable = 1;
1154         }
1155 }
1156
1157 static void acpi_device_get_busid(struct acpi_device *device)
1158 {
1159         char bus_id[5] = { '?', 0 };
1160         struct acpi_buffer buffer = { sizeof(bus_id), bus_id };
1161         int i = 0;
1162
1163         /*
1164          * Bus ID
1165          * ------
1166          * The device's Bus ID is simply the object name.
1167          * TBD: Shouldn't this value be unique (within the ACPI namespace)?
1168          */
1169         if (ACPI_IS_ROOT_DEVICE(device)) {
1170                 strcpy(device->pnp.bus_id, "ACPI");
1171                 return;
1172         }
1173
1174         switch (device->device_type) {
1175         case ACPI_BUS_TYPE_POWER_BUTTON:
1176                 strcpy(device->pnp.bus_id, "PWRF");
1177                 break;
1178         case ACPI_BUS_TYPE_SLEEP_BUTTON:
1179                 strcpy(device->pnp.bus_id, "SLPF");
1180                 break;
1181         default:
1182                 acpi_get_name(device->handle, ACPI_SINGLE_NAME, &buffer);
1183                 /* Clean up trailing underscores (if any) */
1184                 for (i = 3; i > 1; i--) {
1185                         if (bus_id[i] == '_')
1186                                 bus_id[i] = '\0';
1187                         else
1188                                 break;
1189                 }
1190                 strcpy(device->pnp.bus_id, bus_id);
1191                 break;
1192         }
1193 }
1194
1195 /*
1196  * acpi_bay_match - see if a device is an ejectable driver bay
1197  *
1198  * If an acpi object is ejectable and has one of the ACPI ATA methods defined,
1199  * then we can safely call it an ejectable drive bay
1200  */
1201 static int acpi_bay_match(struct acpi_device *device){
1202         acpi_status status;
1203         acpi_handle handle;
1204         acpi_handle tmp;
1205         acpi_handle phandle;
1206
1207         handle = device->handle;
1208
1209         status = acpi_get_handle(handle, "_EJ0", &tmp);
1210         if (ACPI_FAILURE(status))
1211                 return -ENODEV;
1212
1213         if ((ACPI_SUCCESS(acpi_get_handle(handle, "_GTF", &tmp))) ||
1214                 (ACPI_SUCCESS(acpi_get_handle(handle, "_GTM", &tmp))) ||
1215                 (ACPI_SUCCESS(acpi_get_handle(handle, "_STM", &tmp))) ||
1216                 (ACPI_SUCCESS(acpi_get_handle(handle, "_SDD", &tmp))))
1217                 return 0;
1218
1219         if (acpi_get_parent(handle, &phandle))
1220                 return -ENODEV;
1221
1222         if ((ACPI_SUCCESS(acpi_get_handle(phandle, "_GTF", &tmp))) ||
1223                 (ACPI_SUCCESS(acpi_get_handle(phandle, "_GTM", &tmp))) ||
1224                 (ACPI_SUCCESS(acpi_get_handle(phandle, "_STM", &tmp))) ||
1225                 (ACPI_SUCCESS(acpi_get_handle(phandle, "_SDD", &tmp))))
1226                 return 0;
1227
1228         return -ENODEV;
1229 }
1230
1231 /*
1232  * acpi_dock_match - see if a device has a _DCK method
1233  */
1234 static int acpi_dock_match(struct acpi_device *device)
1235 {
1236         acpi_handle tmp;
1237         return acpi_get_handle(device->handle, "_DCK", &tmp);
1238 }
1239
1240 const char *acpi_device_hid(struct acpi_device *device)
1241 {
1242         struct acpi_hardware_id *hid;
1243
1244         if (list_empty(&device->pnp.ids))
1245                 return dummy_hid;
1246
1247         hid = list_first_entry(&device->pnp.ids, struct acpi_hardware_id, list);
1248         return hid->id;
1249 }
1250 EXPORT_SYMBOL(acpi_device_hid);
1251
1252 static void acpi_add_id(struct acpi_device *device, const char *dev_id)
1253 {
1254         struct acpi_hardware_id *id;
1255
1256         id = kmalloc(sizeof(*id), GFP_KERNEL);
1257         if (!id)
1258                 return;
1259
1260         id->id = kstrdup(dev_id, GFP_KERNEL);
1261         if (!id->id) {
1262                 kfree(id);
1263                 return;
1264         }
1265
1266         list_add_tail(&id->list, &device->pnp.ids);
1267 }
1268
1269 /*
1270  * Old IBM workstations have a DSDT bug wherein the SMBus object
1271  * lacks the SMBUS01 HID and the methods do not have the necessary "_"
1272  * prefix.  Work around this.
1273  */
1274 static int acpi_ibm_smbus_match(struct acpi_device *device)
1275 {
1276         acpi_handle h_dummy;
1277         struct acpi_buffer path = {ACPI_ALLOCATE_BUFFER, NULL};
1278         int result;
1279
1280         if (!dmi_name_in_vendors("IBM"))
1281                 return -ENODEV;
1282
1283         /* Look for SMBS object */
1284         result = acpi_get_name(device->handle, ACPI_SINGLE_NAME, &path);
1285         if (result)
1286                 return result;
1287
1288         if (strcmp("SMBS", path.pointer)) {
1289                 result = -ENODEV;
1290                 goto out;
1291         }
1292
1293         /* Does it have the necessary (but misnamed) methods? */
1294         result = -ENODEV;
1295         if (ACPI_SUCCESS(acpi_get_handle(device->handle, "SBI", &h_dummy)) &&
1296             ACPI_SUCCESS(acpi_get_handle(device->handle, "SBR", &h_dummy)) &&
1297             ACPI_SUCCESS(acpi_get_handle(device->handle, "SBW", &h_dummy)))
1298                 result = 0;
1299 out:
1300         kfree(path.pointer);
1301         return result;
1302 }
1303
1304 static void acpi_device_set_id(struct acpi_device *device)
1305 {
1306         acpi_status status;
1307         struct acpi_device_info *info;
1308         struct acpi_pnp_device_id_list *cid_list;
1309         int i;
1310
1311         switch (device->device_type) {
1312         case ACPI_BUS_TYPE_DEVICE:
1313                 if (ACPI_IS_ROOT_DEVICE(device)) {
1314                         acpi_add_id(device, ACPI_SYSTEM_HID);
1315                         break;
1316                 }
1317
1318                 status = acpi_get_object_info(device->handle, &info);
1319                 if (ACPI_FAILURE(status)) {
1320                         printk(KERN_ERR PREFIX "%s: Error reading device info\n", __func__);
1321                         return;
1322                 }
1323
1324                 if (info->valid & ACPI_VALID_HID)
1325                         acpi_add_id(device, info->hardware_id.string);
1326                 if (info->valid & ACPI_VALID_CID) {
1327                         cid_list = &info->compatible_id_list;
1328                         for (i = 0; i < cid_list->count; i++)
1329                                 acpi_add_id(device, cid_list->ids[i].string);
1330                 }
1331                 if (info->valid & ACPI_VALID_ADR) {
1332                         device->pnp.bus_address = info->address;
1333                         device->flags.bus_address = 1;
1334                 }
1335                 if (info->valid & ACPI_VALID_UID)
1336                         device->pnp.unique_id = kstrdup(info->unique_id.string,
1337                                                         GFP_KERNEL);
1338
1339                 kfree(info);
1340
1341                 /*
1342                  * Some devices don't reliably have _HIDs & _CIDs, so add
1343                  * synthetic HIDs to make sure drivers can find them.
1344                  */
1345                 if (acpi_is_video_device(device))
1346                         acpi_add_id(device, ACPI_VIDEO_HID);
1347                 else if (ACPI_SUCCESS(acpi_bay_match(device)))
1348                         acpi_add_id(device, ACPI_BAY_HID);
1349                 else if (ACPI_SUCCESS(acpi_dock_match(device)))
1350                         acpi_add_id(device, ACPI_DOCK_HID);
1351                 else if (!acpi_ibm_smbus_match(device))
1352                         acpi_add_id(device, ACPI_SMBUS_IBM_HID);
1353                 else if (list_empty(&device->pnp.ids) &&
1354                          ACPI_IS_ROOT_DEVICE(device->parent)) {
1355                         acpi_add_id(device, ACPI_BUS_HID); /* \_SB, LNXSYBUS */
1356                         strcpy(device->pnp.device_name, ACPI_BUS_DEVICE_NAME);
1357                         strcpy(device->pnp.device_class, ACPI_BUS_CLASS);
1358                 }
1359
1360                 break;
1361         case ACPI_BUS_TYPE_POWER:
1362                 acpi_add_id(device, ACPI_POWER_HID);
1363                 break;
1364         case ACPI_BUS_TYPE_PROCESSOR:
1365                 acpi_add_id(device, ACPI_PROCESSOR_OBJECT_HID);
1366                 break;
1367         case ACPI_BUS_TYPE_THERMAL:
1368                 acpi_add_id(device, ACPI_THERMAL_HID);
1369                 break;
1370         case ACPI_BUS_TYPE_POWER_BUTTON:
1371                 acpi_add_id(device, ACPI_BUTTON_HID_POWERF);
1372                 break;
1373         case ACPI_BUS_TYPE_SLEEP_BUTTON:
1374                 acpi_add_id(device, ACPI_BUTTON_HID_SLEEPF);
1375                 break;
1376         }
1377 }
1378
1379 void acpi_init_device_object(struct acpi_device *device, acpi_handle handle,
1380                              int type, unsigned long long sta)
1381 {
1382         INIT_LIST_HEAD(&device->pnp.ids);
1383         device->device_type = type;
1384         device->handle = handle;
1385         device->parent = acpi_bus_get_parent(handle);
1386         STRUCT_TO_INT(device->status) = sta;
1387         acpi_device_get_busid(device);
1388         acpi_device_set_id(device);
1389         acpi_bus_get_flags(device);
1390 }
1391
1392 static int acpi_add_single_object(struct acpi_device **child,
1393                                   acpi_handle handle, int type,
1394                                   unsigned long long sta, bool match_driver)
1395 {
1396         int result;
1397         struct acpi_device *device;
1398         struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
1399
1400         device = kzalloc(sizeof(struct acpi_device), GFP_KERNEL);
1401         if (!device) {
1402                 printk(KERN_ERR PREFIX "Memory allocation error\n");
1403                 return -ENOMEM;
1404         }
1405
1406         acpi_init_device_object(device, handle, type, sta);
1407         acpi_bus_get_power_flags(device);
1408         acpi_bus_get_wakeup_device_flags(device);
1409
1410         device->flags.match_driver = match_driver;
1411         result = acpi_device_register(device, acpi_device_release);
1412         if (result) {
1413                 acpi_device_release(&device->dev);
1414                 return result;
1415         }
1416
1417         acpi_power_add_remove_device(device, true);
1418         acpi_get_name(handle, ACPI_FULL_PATHNAME, &buffer);
1419         ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Added %s [%s] parent %s\n",
1420                 dev_name(&device->dev), (char *) buffer.pointer,
1421                 device->parent ? dev_name(&device->parent->dev) : "(null)"));
1422         kfree(buffer.pointer);
1423         *child = device;
1424         return 0;
1425 }
1426
1427 static int acpi_bus_type_and_status(acpi_handle handle, int *type,
1428                                     unsigned long long *sta)
1429 {
1430         acpi_status status;
1431         acpi_object_type acpi_type;
1432
1433         status = acpi_get_type(handle, &acpi_type);
1434         if (ACPI_FAILURE(status))
1435                 return -ENODEV;
1436
1437         switch (acpi_type) {
1438         case ACPI_TYPE_ANY:             /* for ACPI_ROOT_OBJECT */
1439         case ACPI_TYPE_DEVICE:
1440                 *type = ACPI_BUS_TYPE_DEVICE;
1441                 status = acpi_bus_get_status_handle(handle, sta);
1442                 if (ACPI_FAILURE(status))
1443                         return -ENODEV;
1444                 break;
1445         case ACPI_TYPE_PROCESSOR:
1446                 *type = ACPI_BUS_TYPE_PROCESSOR;
1447                 status = acpi_bus_get_status_handle(handle, sta);
1448                 if (ACPI_FAILURE(status))
1449                         return -ENODEV;
1450                 break;
1451         case ACPI_TYPE_THERMAL:
1452                 *type = ACPI_BUS_TYPE_THERMAL;
1453                 *sta = ACPI_STA_DEFAULT;
1454                 break;
1455         case ACPI_TYPE_POWER:
1456                 *type = ACPI_BUS_TYPE_POWER;
1457                 *sta = ACPI_STA_DEFAULT;
1458                 break;
1459         default:
1460                 return -ENODEV;
1461         }
1462
1463         return 0;
1464 }
1465
1466 static acpi_status acpi_bus_check_add(acpi_handle handle, u32 lvl_not_used,
1467                                       void *not_used, void **return_value)
1468 {
1469         struct acpi_device *device = NULL;
1470         int type;
1471         unsigned long long sta;
1472         acpi_status status;
1473         int result;
1474
1475         acpi_bus_get_device(handle, &device);
1476         if (device)
1477                 goto out;
1478
1479         result = acpi_bus_type_and_status(handle, &type, &sta);
1480         if (result)
1481                 return AE_OK;
1482
1483         if (type == ACPI_BUS_TYPE_POWER) {
1484                 acpi_add_power_resource(handle);
1485                 return AE_OK;
1486         }
1487
1488         if (!(sta & ACPI_STA_DEVICE_PRESENT) &&
1489             !(sta & ACPI_STA_DEVICE_FUNCTIONING)) {
1490                 struct acpi_device_wakeup wakeup;
1491                 acpi_handle temp;
1492
1493                 status = acpi_get_handle(handle, "_PRW", &temp);
1494                 if (ACPI_SUCCESS(status))
1495                         acpi_bus_extract_wakeup_device_power_package(handle,
1496                                                                      &wakeup);
1497                 return AE_CTRL_DEPTH;
1498         }
1499
1500         acpi_add_single_object(&device, handle, type, sta, false);
1501         if (!device)
1502                 return AE_CTRL_DEPTH;
1503
1504         device->flags.match_driver = true;
1505
1506  out:
1507         if (!*return_value)
1508                 *return_value = device;
1509
1510         return AE_OK;
1511 }
1512
1513 static acpi_status acpi_bus_device_attach(acpi_handle handle, u32 lvl_not_used,
1514                                           void *not_used, void **ret_not_used)
1515 {
1516         acpi_status status = AE_OK;
1517         struct acpi_device *device;
1518         unsigned long long sta_not_used;
1519         int type_not_used;
1520
1521         /*
1522          * Ignore errors ignored by acpi_bus_check_add() to avoid terminating
1523          * namespace walks prematurely.
1524          */
1525         if (acpi_bus_type_and_status(handle, &type_not_used, &sta_not_used))
1526                 return AE_OK;
1527
1528         if (acpi_bus_get_device(handle, &device))
1529                 return AE_CTRL_DEPTH;
1530
1531         if (!acpi_match_device_ids(device, acpi_platform_device_ids)) {
1532                 /* This is a known good platform device. */
1533                 acpi_create_platform_device(device);
1534         } else if (device_attach(&device->dev) < 0) {
1535                 status = AE_CTRL_DEPTH;
1536         }
1537         return status;
1538 }
1539
1540 static int acpi_bus_scan(acpi_handle handle)
1541 {
1542         void *device = NULL;
1543
1544         if (ACPI_SUCCESS(acpi_bus_check_add(handle, 0, NULL, &device)))
1545                 acpi_walk_namespace(ACPI_TYPE_ANY, handle, ACPI_UINT32_MAX,
1546                                     acpi_bus_check_add, NULL, NULL, &device);
1547
1548         if (!device)
1549                 return -ENODEV;
1550
1551         if (ACPI_SUCCESS(acpi_bus_device_attach(handle, 0, NULL, NULL)))
1552                 acpi_walk_namespace(ACPI_TYPE_ANY, handle, ACPI_UINT32_MAX,
1553                                     acpi_bus_device_attach, NULL, NULL, NULL);
1554
1555         return 0;
1556 }
1557
1558 /**
1559  * acpi_bus_add - Add ACPI device node objects in a given namespace scope.
1560  * @handle: Root of the namespace scope to scan.
1561  *
1562  * Scan a given ACPI tree (probably recently hot-plugged) and create and add
1563  * found devices.
1564  *
1565  * If no devices were found, -ENODEV is returned, but it does not mean that
1566  * there has been a real error.  There just have been no suitable ACPI objects
1567  * in the table trunk from which the kernel could create a device and add an
1568  * appropriate driver.
1569  */
1570 int acpi_bus_add(acpi_handle handle)
1571 {
1572         int err;
1573
1574         err = acpi_bus_scan(handle);
1575         if (err)
1576                 return err;
1577
1578         acpi_update_all_gpes();
1579         return 0;
1580 }
1581 EXPORT_SYMBOL(acpi_bus_add);
1582
1583 static acpi_status acpi_bus_device_detach(acpi_handle handle, u32 lvl_not_used,
1584                                           void *not_used, void **ret_not_used)
1585 {
1586         struct acpi_device *device = NULL;
1587
1588         if (!acpi_bus_get_device(handle, &device)) {
1589                 device->removal_type = ACPI_BUS_REMOVAL_EJECT;
1590                 device_release_driver(&device->dev);
1591         }
1592         return AE_OK;
1593 }
1594
1595 static acpi_status acpi_bus_remove(acpi_handle handle, u32 lvl_not_used,
1596                                    void *not_used, void **ret_not_used)
1597 {
1598         struct acpi_device *device = NULL;
1599
1600         if (!acpi_bus_get_device(handle, &device))
1601                 acpi_device_unregister(device);
1602
1603         return AE_OK;
1604 }
1605
1606 int acpi_bus_trim(struct acpi_device *start)
1607 {
1608         /*
1609          * Execute acpi_bus_device_detach() as a post-order callback to detach
1610          * all ACPI drivers from the device nodes being removed.
1611          */
1612         acpi_walk_namespace(ACPI_TYPE_ANY, start->handle, ACPI_UINT32_MAX, NULL,
1613                             acpi_bus_device_detach, NULL, NULL);
1614         acpi_bus_device_detach(start->handle, 0, NULL, NULL);
1615         /*
1616          * Execute acpi_bus_remove() as a post-order callback to remove device
1617          * nodes in the given namespace scope.
1618          */
1619         acpi_walk_namespace(ACPI_TYPE_ANY, start->handle, ACPI_UINT32_MAX, NULL,
1620                             acpi_bus_remove, NULL, NULL);
1621         acpi_bus_remove(start->handle, 0, NULL, NULL);
1622         return 0;
1623 }
1624 EXPORT_SYMBOL_GPL(acpi_bus_trim);
1625
1626 static int acpi_bus_scan_fixed(void)
1627 {
1628         int result = 0;
1629         struct acpi_device *device = NULL;
1630
1631         /*
1632          * Enumerate all fixed-feature devices.
1633          */
1634         if ((acpi_gbl_FADT.flags & ACPI_FADT_POWER_BUTTON) == 0) {
1635                 result = acpi_add_single_object(&device, NULL,
1636                                                 ACPI_BUS_TYPE_POWER_BUTTON,
1637                                                 ACPI_STA_DEFAULT, true);
1638                 device_init_wakeup(&device->dev, true);
1639         }
1640
1641         if ((acpi_gbl_FADT.flags & ACPI_FADT_SLEEP_BUTTON) == 0) {
1642                 result = acpi_add_single_object(&device, NULL,
1643                                                 ACPI_BUS_TYPE_SLEEP_BUTTON,
1644                                                 ACPI_STA_DEFAULT, true);
1645         }
1646
1647         return result;
1648 }
1649
1650 int __init acpi_scan_init(void)
1651 {
1652         int result;
1653
1654         result = bus_register(&acpi_bus_type);
1655         if (result) {
1656                 /* We don't want to quit even if we failed to add suspend/resume */
1657                 printk(KERN_ERR PREFIX "Could not register bus type\n");
1658         }
1659
1660         acpi_pci_root_init();
1661
1662         /*
1663          * Enumerate devices in the ACPI namespace.
1664          */
1665         result = acpi_bus_scan(ACPI_ROOT_OBJECT);
1666         if (result)
1667                 return result;
1668
1669         result = acpi_bus_get_device(ACPI_ROOT_OBJECT, &acpi_root);
1670         if (!result)
1671                 result = acpi_bus_scan_fixed();
1672
1673         if (result)
1674                 acpi_device_unregister(acpi_root);
1675         else
1676                 acpi_update_all_gpes();
1677
1678         return result;
1679 }