]> git.openfabrics.org - ~shefty/rdma-dev.git/blob - drivers/acpi/scan.c
Merge branch 'acpi-general'
[~shefty/rdma-dev.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;
120         acpi_handle handle = ej_event->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         if (acpi_bus_get_device(handle, &device))
128                 goto err_out;
129
130         if (!device)
131                 goto err_out;
132
133         ACPI_DEBUG_PRINT((ACPI_DB_INFO,
134                 "Hot-removing device %s...\n", dev_name(&device->dev)));
135
136         if (acpi_bus_trim(device, 1)) {
137                 printk(KERN_ERR PREFIX
138                                 "Removing device failed\n");
139                 goto err_out;
140         }
141
142         /* device has been freed */
143         device = NULL;
144
145         /* power off device */
146         status = acpi_evaluate_object(handle, "_PS3", NULL, NULL);
147         if (ACPI_FAILURE(status) && status != AE_NOT_FOUND)
148                 printk(KERN_WARNING PREFIX
149                                 "Power-off device failed\n");
150
151         if (ACPI_SUCCESS(acpi_get_handle(handle, "_LCK", &temp))) {
152                 arg_list.count = 1;
153                 arg_list.pointer = &arg;
154                 arg.type = ACPI_TYPE_INTEGER;
155                 arg.integer.value = 0;
156                 acpi_evaluate_object(handle, "_LCK", &arg_list, NULL);
157         }
158
159         arg_list.count = 1;
160         arg_list.pointer = &arg;
161         arg.type = ACPI_TYPE_INTEGER;
162         arg.integer.value = 1;
163
164         /*
165          * TBD: _EJD support.
166          */
167         status = acpi_evaluate_object(handle, "_EJ0", &arg_list, NULL);
168         if (ACPI_FAILURE(status)) {
169                 if (status != AE_NOT_FOUND)
170                         printk(KERN_WARNING PREFIX
171                                         "Eject device failed\n");
172                 goto err_out;
173         }
174
175         kfree(context);
176         return;
177
178 err_out:
179         /* Inform firmware the hot-remove operation has completed w/ error */
180         (void) acpi_evaluate_hotplug_ost(handle,
181                                 ej_event->event, ost_code, NULL);
182         kfree(context);
183         return;
184 }
185 EXPORT_SYMBOL(acpi_bus_hot_remove_device);
186
187 static ssize_t
188 acpi_eject_store(struct device *d, struct device_attribute *attr,
189                 const char *buf, size_t count)
190 {
191         int ret = count;
192         acpi_status status;
193         acpi_object_type type = 0;
194         struct acpi_device *acpi_device = to_acpi_device(d);
195         struct acpi_eject_event *ej_event;
196
197         if ((!count) || (buf[0] != '1')) {
198                 return -EINVAL;
199         }
200 #ifndef FORCE_EJECT
201         if (acpi_device->driver == NULL) {
202                 ret = -ENODEV;
203                 goto err;
204         }
205 #endif
206         status = acpi_get_type(acpi_device->handle, &type);
207         if (ACPI_FAILURE(status) || (!acpi_device->flags.ejectable)) {
208                 ret = -ENODEV;
209                 goto err;
210         }
211
212         ej_event = kmalloc(sizeof(*ej_event), GFP_KERNEL);
213         if (!ej_event) {
214                 ret = -ENOMEM;
215                 goto err;
216         }
217
218         ej_event->handle = acpi_device->handle;
219         if (acpi_device->flags.eject_pending) {
220                 /* event originated from ACPI eject notification */
221                 ej_event->event = ACPI_NOTIFY_EJECT_REQUEST;
222                 acpi_device->flags.eject_pending = 0;
223         } else {
224                 /* event originated from user */
225                 ej_event->event = ACPI_OST_EC_OSPM_EJECT;
226                 (void) acpi_evaluate_hotplug_ost(ej_event->handle,
227                         ej_event->event, ACPI_OST_SC_EJECT_IN_PROGRESS, NULL);
228         }
229
230         acpi_os_hotplug_execute(acpi_bus_hot_remove_device, (void *)ej_event);
231 err:
232         return ret;
233 }
234
235 static DEVICE_ATTR(eject, 0200, NULL, acpi_eject_store);
236
237 static ssize_t
238 acpi_device_hid_show(struct device *dev, struct device_attribute *attr, char *buf) {
239         struct acpi_device *acpi_dev = to_acpi_device(dev);
240
241         return sprintf(buf, "%s\n", acpi_device_hid(acpi_dev));
242 }
243 static DEVICE_ATTR(hid, 0444, acpi_device_hid_show, NULL);
244
245 static ssize_t acpi_device_uid_show(struct device *dev,
246                                     struct device_attribute *attr, char *buf)
247 {
248         struct acpi_device *acpi_dev = to_acpi_device(dev);
249
250         return sprintf(buf, "%s\n", acpi_dev->pnp.unique_id);
251 }
252 static DEVICE_ATTR(uid, 0444, acpi_device_uid_show, NULL);
253
254 static ssize_t acpi_device_adr_show(struct device *dev,
255                                     struct device_attribute *attr, char *buf)
256 {
257         struct acpi_device *acpi_dev = to_acpi_device(dev);
258
259         return sprintf(buf, "0x%08x\n",
260                        (unsigned int)(acpi_dev->pnp.bus_address));
261 }
262 static DEVICE_ATTR(adr, 0444, acpi_device_adr_show, NULL);
263
264 static ssize_t
265 acpi_device_path_show(struct device *dev, struct device_attribute *attr, char *buf) {
266         struct acpi_device *acpi_dev = to_acpi_device(dev);
267         struct acpi_buffer path = {ACPI_ALLOCATE_BUFFER, NULL};
268         int result;
269
270         result = acpi_get_name(acpi_dev->handle, ACPI_FULL_PATHNAME, &path);
271         if (result)
272                 goto end;
273
274         result = sprintf(buf, "%s\n", (char*)path.pointer);
275         kfree(path.pointer);
276 end:
277         return result;
278 }
279 static DEVICE_ATTR(path, 0444, acpi_device_path_show, NULL);
280
281 /* sysfs file that shows description text from the ACPI _STR method */
282 static ssize_t description_show(struct device *dev,
283                                 struct device_attribute *attr,
284                                 char *buf) {
285         struct acpi_device *acpi_dev = to_acpi_device(dev);
286         int result;
287
288         if (acpi_dev->pnp.str_obj == NULL)
289                 return 0;
290
291         /*
292          * The _STR object contains a Unicode identifier for a device.
293          * We need to convert to utf-8 so it can be displayed.
294          */
295         result = utf16s_to_utf8s(
296                 (wchar_t *)acpi_dev->pnp.str_obj->buffer.pointer,
297                 acpi_dev->pnp.str_obj->buffer.length,
298                 UTF16_LITTLE_ENDIAN, buf,
299                 PAGE_SIZE);
300
301         buf[result++] = '\n';
302
303         return result;
304 }
305 static DEVICE_ATTR(description, 0444, description_show, NULL);
306
307 static ssize_t
308 acpi_device_sun_show(struct device *dev, struct device_attribute *attr,
309                      char *buf) {
310         struct acpi_device *acpi_dev = to_acpi_device(dev);
311
312         return sprintf(buf, "%lu\n", acpi_dev->pnp.sun);
313 }
314 static DEVICE_ATTR(sun, 0444, acpi_device_sun_show, NULL);
315
316 static int acpi_device_setup_files(struct acpi_device *dev)
317 {
318         struct acpi_buffer buffer = {ACPI_ALLOCATE_BUFFER, NULL};
319         acpi_status status;
320         acpi_handle temp;
321         unsigned long long sun;
322         int result = 0;
323
324         /*
325          * Devices gotten from FADT don't have a "path" attribute
326          */
327         if (dev->handle) {
328                 result = device_create_file(&dev->dev, &dev_attr_path);
329                 if (result)
330                         goto end;
331         }
332
333         if (!list_empty(&dev->pnp.ids)) {
334                 result = device_create_file(&dev->dev, &dev_attr_hid);
335                 if (result)
336                         goto end;
337
338                 result = device_create_file(&dev->dev, &dev_attr_modalias);
339                 if (result)
340                         goto end;
341         }
342
343         /*
344          * If device has _STR, 'description' file is created
345          */
346         status = acpi_get_handle(dev->handle, "_STR", &temp);
347         if (ACPI_SUCCESS(status)) {
348                 status = acpi_evaluate_object(dev->handle, "_STR",
349                                         NULL, &buffer);
350                 if (ACPI_FAILURE(status))
351                         buffer.pointer = NULL;
352                 dev->pnp.str_obj = buffer.pointer;
353                 result = device_create_file(&dev->dev, &dev_attr_description);
354                 if (result)
355                         goto end;
356         }
357
358         if (dev->flags.bus_address)
359                 result = device_create_file(&dev->dev, &dev_attr_adr);
360         if (dev->pnp.unique_id)
361                 result = device_create_file(&dev->dev, &dev_attr_uid);
362
363         status = acpi_evaluate_integer(dev->handle, "_SUN", NULL, &sun);
364         if (ACPI_SUCCESS(status)) {
365                 dev->pnp.sun = (unsigned long)sun;
366                 result = device_create_file(&dev->dev, &dev_attr_sun);
367                 if (result)
368                         goto end;
369         } else {
370                 dev->pnp.sun = (unsigned long)-1;
371         }
372
373         /*
374          * If device has _EJ0, 'eject' file is created that is used to trigger
375          * hot-removal function from userland.
376          */
377         status = acpi_get_handle(dev->handle, "_EJ0", &temp);
378         if (ACPI_SUCCESS(status))
379                 result = device_create_file(&dev->dev, &dev_attr_eject);
380 end:
381         return result;
382 }
383
384 static void acpi_device_remove_files(struct acpi_device *dev)
385 {
386         acpi_status status;
387         acpi_handle temp;
388
389         /*
390          * If device has _STR, remove 'description' file
391          */
392         status = acpi_get_handle(dev->handle, "_STR", &temp);
393         if (ACPI_SUCCESS(status)) {
394                 kfree(dev->pnp.str_obj);
395                 device_remove_file(&dev->dev, &dev_attr_description);
396         }
397         /*
398          * If device has _EJ0, remove 'eject' file.
399          */
400         status = acpi_get_handle(dev->handle, "_EJ0", &temp);
401         if (ACPI_SUCCESS(status))
402                 device_remove_file(&dev->dev, &dev_attr_eject);
403
404         status = acpi_get_handle(dev->handle, "_SUN", &temp);
405         if (ACPI_SUCCESS(status))
406                 device_remove_file(&dev->dev, &dev_attr_sun);
407
408         if (dev->pnp.unique_id)
409                 device_remove_file(&dev->dev, &dev_attr_uid);
410         if (dev->flags.bus_address)
411                 device_remove_file(&dev->dev, &dev_attr_adr);
412         device_remove_file(&dev->dev, &dev_attr_modalias);
413         device_remove_file(&dev->dev, &dev_attr_hid);
414         if (dev->handle)
415                 device_remove_file(&dev->dev, &dev_attr_path);
416 }
417 /* --------------------------------------------------------------------------
418                         ACPI Bus operations
419    -------------------------------------------------------------------------- */
420
421 static const struct acpi_device_id *__acpi_match_device(
422         struct acpi_device *device, const struct acpi_device_id *ids)
423 {
424         const struct acpi_device_id *id;
425         struct acpi_hardware_id *hwid;
426
427         /*
428          * If the device is not present, it is unnecessary to load device
429          * driver for it.
430          */
431         if (!device->status.present)
432                 return NULL;
433
434         for (id = ids; id->id[0]; id++)
435                 list_for_each_entry(hwid, &device->pnp.ids, list)
436                         if (!strcmp((char *) id->id, hwid->id))
437                                 return id;
438
439         return NULL;
440 }
441
442 /**
443  * acpi_match_device - Match a struct device against a given list of ACPI IDs
444  * @ids: Array of struct acpi_device_id object to match against.
445  * @dev: The device structure to match.
446  *
447  * Check if @dev has a valid ACPI handle and if there is a struct acpi_device
448  * object for that handle and use that object to match against a given list of
449  * device IDs.
450  *
451  * Return a pointer to the first matching ID on success or %NULL on failure.
452  */
453 const struct acpi_device_id *acpi_match_device(const struct acpi_device_id *ids,
454                                                const struct device *dev)
455 {
456         struct acpi_device *adev;
457
458         if (!ids || !ACPI_HANDLE(dev)
459             || ACPI_FAILURE(acpi_bus_get_device(ACPI_HANDLE(dev), &adev)))
460                 return NULL;
461
462         return __acpi_match_device(adev, ids);
463 }
464 EXPORT_SYMBOL_GPL(acpi_match_device);
465
466 int acpi_match_device_ids(struct acpi_device *device,
467                           const struct acpi_device_id *ids)
468 {
469         return __acpi_match_device(device, ids) ? 0 : -ENOENT;
470 }
471 EXPORT_SYMBOL(acpi_match_device_ids);
472
473 static void acpi_free_ids(struct acpi_device *device)
474 {
475         struct acpi_hardware_id *id, *tmp;
476
477         list_for_each_entry_safe(id, tmp, &device->pnp.ids, list) {
478                 kfree(id->id);
479                 kfree(id);
480         }
481 }
482
483 static void acpi_device_release(struct device *dev)
484 {
485         struct acpi_device *acpi_dev = to_acpi_device(dev);
486
487         acpi_free_ids(acpi_dev);
488         kfree(acpi_dev->pnp.unique_id);
489         kfree(acpi_dev);
490 }
491
492 static int acpi_bus_match(struct device *dev, struct device_driver *drv)
493 {
494         struct acpi_device *acpi_dev = to_acpi_device(dev);
495         struct acpi_driver *acpi_drv = to_acpi_driver(drv);
496
497         return !acpi_match_device_ids(acpi_dev, acpi_drv->ids);
498 }
499
500 static int acpi_device_uevent(struct device *dev, struct kobj_uevent_env *env)
501 {
502         struct acpi_device *acpi_dev = to_acpi_device(dev);
503         int len;
504
505         if (list_empty(&acpi_dev->pnp.ids))
506                 return 0;
507
508         if (add_uevent_var(env, "MODALIAS="))
509                 return -ENOMEM;
510         len = create_modalias(acpi_dev, &env->buf[env->buflen - 1],
511                               sizeof(env->buf) - env->buflen);
512         if (len >= (sizeof(env->buf) - env->buflen))
513                 return -ENOMEM;
514         env->buflen += len;
515         return 0;
516 }
517
518 static void acpi_device_notify(acpi_handle handle, u32 event, void *data)
519 {
520         struct acpi_device *device = data;
521
522         device->driver->ops.notify(device, event);
523 }
524
525 static acpi_status acpi_device_notify_fixed(void *data)
526 {
527         struct acpi_device *device = data;
528
529         /* Fixed hardware devices have no handles */
530         acpi_device_notify(NULL, ACPI_FIXED_HARDWARE_EVENT, device);
531         return AE_OK;
532 }
533
534 static int acpi_device_install_notify_handler(struct acpi_device *device)
535 {
536         acpi_status status;
537
538         if (device->device_type == ACPI_BUS_TYPE_POWER_BUTTON)
539                 status =
540                     acpi_install_fixed_event_handler(ACPI_EVENT_POWER_BUTTON,
541                                                      acpi_device_notify_fixed,
542                                                      device);
543         else if (device->device_type == ACPI_BUS_TYPE_SLEEP_BUTTON)
544                 status =
545                     acpi_install_fixed_event_handler(ACPI_EVENT_SLEEP_BUTTON,
546                                                      acpi_device_notify_fixed,
547                                                      device);
548         else
549                 status = acpi_install_notify_handler(device->handle,
550                                                      ACPI_DEVICE_NOTIFY,
551                                                      acpi_device_notify,
552                                                      device);
553
554         if (ACPI_FAILURE(status))
555                 return -EINVAL;
556         return 0;
557 }
558
559 static void acpi_device_remove_notify_handler(struct acpi_device *device)
560 {
561         if (device->device_type == ACPI_BUS_TYPE_POWER_BUTTON)
562                 acpi_remove_fixed_event_handler(ACPI_EVENT_POWER_BUTTON,
563                                                 acpi_device_notify_fixed);
564         else if (device->device_type == ACPI_BUS_TYPE_SLEEP_BUTTON)
565                 acpi_remove_fixed_event_handler(ACPI_EVENT_SLEEP_BUTTON,
566                                                 acpi_device_notify_fixed);
567         else
568                 acpi_remove_notify_handler(device->handle, ACPI_DEVICE_NOTIFY,
569                                            acpi_device_notify);
570 }
571
572 static int acpi_bus_driver_init(struct acpi_device *, struct acpi_driver *);
573 static int acpi_start_single_object(struct acpi_device *);
574 static int acpi_device_probe(struct device * dev)
575 {
576         struct acpi_device *acpi_dev = to_acpi_device(dev);
577         struct acpi_driver *acpi_drv = to_acpi_driver(dev->driver);
578         int ret;
579
580         ret = acpi_bus_driver_init(acpi_dev, acpi_drv);
581         if (!ret) {
582                 if (acpi_dev->bus_ops.acpi_op_start)
583                         acpi_start_single_object(acpi_dev);
584
585                 if (acpi_drv->ops.notify) {
586                         ret = acpi_device_install_notify_handler(acpi_dev);
587                         if (ret) {
588                                 if (acpi_drv->ops.remove)
589                                         acpi_drv->ops.remove(acpi_dev,
590                                                      acpi_dev->removal_type);
591                                 return ret;
592                         }
593                 }
594
595                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
596                         "Found driver [%s] for device [%s]\n",
597                         acpi_drv->name, acpi_dev->pnp.bus_id));
598                 get_device(dev);
599         }
600         return ret;
601 }
602
603 static int acpi_device_remove(struct device * dev)
604 {
605         struct acpi_device *acpi_dev = to_acpi_device(dev);
606         struct acpi_driver *acpi_drv = acpi_dev->driver;
607
608         if (acpi_drv) {
609                 if (acpi_drv->ops.notify)
610                         acpi_device_remove_notify_handler(acpi_dev);
611                 if (acpi_drv->ops.remove)
612                         acpi_drv->ops.remove(acpi_dev, acpi_dev->removal_type);
613         }
614         acpi_dev->driver = NULL;
615         acpi_dev->driver_data = NULL;
616
617         put_device(dev);
618         return 0;
619 }
620
621 struct bus_type acpi_bus_type = {
622         .name           = "acpi",
623         .match          = acpi_bus_match,
624         .probe          = acpi_device_probe,
625         .remove         = acpi_device_remove,
626         .uevent         = acpi_device_uevent,
627 };
628
629 static int acpi_device_register(struct acpi_device *device)
630 {
631         int result;
632         struct acpi_device_bus_id *acpi_device_bus_id, *new_bus_id;
633         int found = 0;
634
635         /*
636          * Linkage
637          * -------
638          * Link this device to its parent and siblings.
639          */
640         INIT_LIST_HEAD(&device->children);
641         INIT_LIST_HEAD(&device->node);
642         INIT_LIST_HEAD(&device->wakeup_list);
643         INIT_LIST_HEAD(&device->physical_node_list);
644         mutex_init(&device->physical_node_lock);
645
646         new_bus_id = kzalloc(sizeof(struct acpi_device_bus_id), GFP_KERNEL);
647         if (!new_bus_id) {
648                 printk(KERN_ERR PREFIX "Memory allocation error\n");
649                 return -ENOMEM;
650         }
651
652         mutex_lock(&acpi_device_lock);
653         /*
654          * Find suitable bus_id and instance number in acpi_bus_id_list
655          * If failed, create one and link it into acpi_bus_id_list
656          */
657         list_for_each_entry(acpi_device_bus_id, &acpi_bus_id_list, node) {
658                 if (!strcmp(acpi_device_bus_id->bus_id,
659                             acpi_device_hid(device))) {
660                         acpi_device_bus_id->instance_no++;
661                         found = 1;
662                         kfree(new_bus_id);
663                         break;
664                 }
665         }
666         if (!found) {
667                 acpi_device_bus_id = new_bus_id;
668                 strcpy(acpi_device_bus_id->bus_id, acpi_device_hid(device));
669                 acpi_device_bus_id->instance_no = 0;
670                 list_add_tail(&acpi_device_bus_id->node, &acpi_bus_id_list);
671         }
672         dev_set_name(&device->dev, "%s:%02x", acpi_device_bus_id->bus_id, acpi_device_bus_id->instance_no);
673
674         if (device->parent)
675                 list_add_tail(&device->node, &device->parent->children);
676
677         if (device->wakeup.flags.valid)
678                 list_add_tail(&device->wakeup_list, &acpi_wakeup_device_list);
679         mutex_unlock(&acpi_device_lock);
680
681         if (device->parent)
682                 device->dev.parent = &device->parent->dev;
683         device->dev.bus = &acpi_bus_type;
684         device->dev.release = &acpi_device_release;
685         result = device_register(&device->dev);
686         if (result) {
687                 dev_err(&device->dev, "Error registering device\n");
688                 goto end;
689         }
690
691         result = acpi_device_setup_files(device);
692         if (result)
693                 printk(KERN_ERR PREFIX "Error creating sysfs interface for device %s\n",
694                        dev_name(&device->dev));
695
696         device->removal_type = ACPI_BUS_REMOVAL_NORMAL;
697         return 0;
698 end:
699         mutex_lock(&acpi_device_lock);
700         if (device->parent)
701                 list_del(&device->node);
702         list_del(&device->wakeup_list);
703         mutex_unlock(&acpi_device_lock);
704         return result;
705 }
706
707 static void acpi_device_unregister(struct acpi_device *device, int type)
708 {
709         mutex_lock(&acpi_device_lock);
710         if (device->parent)
711                 list_del(&device->node);
712
713         list_del(&device->wakeup_list);
714         mutex_unlock(&acpi_device_lock);
715
716         acpi_detach_data(device->handle, acpi_bus_data_handler);
717
718         acpi_device_remove_files(device);
719         device_unregister(&device->dev);
720 }
721
722 /* --------------------------------------------------------------------------
723                                  Driver Management
724    -------------------------------------------------------------------------- */
725 /**
726  * acpi_bus_driver_init - add a device to a driver
727  * @device: the device to add and initialize
728  * @driver: driver for the device
729  *
730  * Used to initialize a device via its device driver.  Called whenever a
731  * driver is bound to a device.  Invokes the driver's add() ops.
732  */
733 static int
734 acpi_bus_driver_init(struct acpi_device *device, struct acpi_driver *driver)
735 {
736         int result = 0;
737
738         if (!device || !driver)
739                 return -EINVAL;
740
741         if (!driver->ops.add)
742                 return -ENOSYS;
743
744         result = driver->ops.add(device);
745         if (result) {
746                 device->driver = NULL;
747                 device->driver_data = NULL;
748                 return result;
749         }
750
751         device->driver = driver;
752
753         /*
754          * TBD - Configuration Management: Assign resources to device based
755          * upon possible configuration and currently allocated resources.
756          */
757
758         ACPI_DEBUG_PRINT((ACPI_DB_INFO,
759                           "Driver successfully bound to device\n"));
760         return 0;
761 }
762
763 static int acpi_start_single_object(struct acpi_device *device)
764 {
765         int result = 0;
766         struct acpi_driver *driver;
767
768
769         if (!(driver = device->driver))
770                 return 0;
771
772         if (driver->ops.start) {
773                 result = driver->ops.start(device);
774                 if (result && driver->ops.remove)
775                         driver->ops.remove(device, ACPI_BUS_REMOVAL_NORMAL);
776         }
777
778         return result;
779 }
780
781 /**
782  * acpi_bus_register_driver - register a driver with the ACPI bus
783  * @driver: driver being registered
784  *
785  * Registers a driver with the ACPI bus.  Searches the namespace for all
786  * devices that match the driver's criteria and binds.  Returns zero for
787  * success or a negative error status for failure.
788  */
789 int acpi_bus_register_driver(struct acpi_driver *driver)
790 {
791         int ret;
792
793         if (acpi_disabled)
794                 return -ENODEV;
795         driver->drv.name = driver->name;
796         driver->drv.bus = &acpi_bus_type;
797         driver->drv.owner = driver->owner;
798
799         ret = driver_register(&driver->drv);
800         return ret;
801 }
802
803 EXPORT_SYMBOL(acpi_bus_register_driver);
804
805 /**
806  * acpi_bus_unregister_driver - unregisters a driver with the APIC bus
807  * @driver: driver to unregister
808  *
809  * Unregisters a driver with the ACPI bus.  Searches the namespace for all
810  * devices that match the driver's criteria and unbinds.
811  */
812 void acpi_bus_unregister_driver(struct acpi_driver *driver)
813 {
814         driver_unregister(&driver->drv);
815 }
816
817 EXPORT_SYMBOL(acpi_bus_unregister_driver);
818
819 /* --------------------------------------------------------------------------
820                                  Device Enumeration
821    -------------------------------------------------------------------------- */
822 static struct acpi_device *acpi_bus_get_parent(acpi_handle handle)
823 {
824         acpi_status status;
825         int ret;
826         struct acpi_device *device;
827
828         /*
829          * Fixed hardware devices do not appear in the namespace and do not
830          * have handles, but we fabricate acpi_devices for them, so we have
831          * to deal with them specially.
832          */
833         if (handle == NULL)
834                 return acpi_root;
835
836         do {
837                 status = acpi_get_parent(handle, &handle);
838                 if (status == AE_NULL_ENTRY)
839                         return NULL;
840                 if (ACPI_FAILURE(status))
841                         return acpi_root;
842
843                 ret = acpi_bus_get_device(handle, &device);
844                 if (ret == 0)
845                         return device;
846         } while (1);
847 }
848
849 acpi_status
850 acpi_bus_get_ejd(acpi_handle handle, acpi_handle *ejd)
851 {
852         acpi_status status;
853         acpi_handle tmp;
854         struct acpi_buffer buffer = {ACPI_ALLOCATE_BUFFER, NULL};
855         union acpi_object *obj;
856
857         status = acpi_get_handle(handle, "_EJD", &tmp);
858         if (ACPI_FAILURE(status))
859                 return status;
860
861         status = acpi_evaluate_object(handle, "_EJD", NULL, &buffer);
862         if (ACPI_SUCCESS(status)) {
863                 obj = buffer.pointer;
864                 status = acpi_get_handle(ACPI_ROOT_OBJECT, obj->string.pointer,
865                                          ejd);
866                 kfree(buffer.pointer);
867         }
868         return status;
869 }
870 EXPORT_SYMBOL_GPL(acpi_bus_get_ejd);
871
872 void acpi_bus_data_handler(acpi_handle handle, void *context)
873 {
874
875         /* TBD */
876
877         return;
878 }
879
880 static int acpi_bus_get_perf_flags(struct acpi_device *device)
881 {
882         device->performance.state = ACPI_STATE_UNKNOWN;
883         return 0;
884 }
885
886 static acpi_status
887 acpi_bus_extract_wakeup_device_power_package(acpi_handle handle,
888                                              struct acpi_device_wakeup *wakeup)
889 {
890         struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
891         union acpi_object *package = NULL;
892         union acpi_object *element = NULL;
893         acpi_status status;
894         int i = 0;
895
896         if (!wakeup)
897                 return AE_BAD_PARAMETER;
898
899         /* _PRW */
900         status = acpi_evaluate_object(handle, "_PRW", NULL, &buffer);
901         if (ACPI_FAILURE(status)) {
902                 ACPI_EXCEPTION((AE_INFO, status, "Evaluating _PRW"));
903                 return status;
904         }
905
906         package = (union acpi_object *)buffer.pointer;
907
908         if (!package || (package->package.count < 2)) {
909                 status = AE_BAD_DATA;
910                 goto out;
911         }
912
913         element = &(package->package.elements[0]);
914         if (!element) {
915                 status = AE_BAD_DATA;
916                 goto out;
917         }
918         if (element->type == ACPI_TYPE_PACKAGE) {
919                 if ((element->package.count < 2) ||
920                     (element->package.elements[0].type !=
921                      ACPI_TYPE_LOCAL_REFERENCE)
922                     || (element->package.elements[1].type != ACPI_TYPE_INTEGER)) {
923                         status = AE_BAD_DATA;
924                         goto out;
925                 }
926                 wakeup->gpe_device =
927                     element->package.elements[0].reference.handle;
928                 wakeup->gpe_number =
929                     (u32) element->package.elements[1].integer.value;
930         } else if (element->type == ACPI_TYPE_INTEGER) {
931                 wakeup->gpe_device = NULL;
932                 wakeup->gpe_number = element->integer.value;
933         } else {
934                 status = AE_BAD_DATA;
935                 goto out;
936         }
937
938         element = &(package->package.elements[1]);
939         if (element->type != ACPI_TYPE_INTEGER) {
940                 status = AE_BAD_DATA;
941                 goto out;
942         }
943         wakeup->sleep_state = element->integer.value;
944
945         if ((package->package.count - 2) > ACPI_MAX_HANDLES) {
946                 status = AE_NO_MEMORY;
947                 goto out;
948         }
949         wakeup->resources.count = package->package.count - 2;
950         for (i = 0; i < wakeup->resources.count; i++) {
951                 element = &(package->package.elements[i + 2]);
952                 if (element->type != ACPI_TYPE_LOCAL_REFERENCE) {
953                         status = AE_BAD_DATA;
954                         goto out;
955                 }
956
957                 wakeup->resources.handles[i] = element->reference.handle;
958         }
959
960         acpi_setup_gpe_for_wake(handle, wakeup->gpe_device, wakeup->gpe_number);
961
962  out:
963         kfree(buffer.pointer);
964
965         return status;
966 }
967
968 static void acpi_bus_set_run_wake_flags(struct acpi_device *device)
969 {
970         struct acpi_device_id button_device_ids[] = {
971                 {"PNP0C0C", 0},
972                 {"PNP0C0D", 0},
973                 {"PNP0C0E", 0},
974                 {"", 0},
975         };
976         acpi_status status;
977         acpi_event_status event_status;
978
979         device->wakeup.flags.notifier_present = 0;
980
981         /* Power button, Lid switch always enable wakeup */
982         if (!acpi_match_device_ids(device, button_device_ids)) {
983                 device->wakeup.flags.run_wake = 1;
984                 if (!acpi_match_device_ids(device, &button_device_ids[1])) {
985                         /* Do not use Lid/sleep button for S5 wakeup */
986                         if (device->wakeup.sleep_state == ACPI_STATE_S5)
987                                 device->wakeup.sleep_state = ACPI_STATE_S4;
988                 }
989                 device_set_wakeup_capable(&device->dev, true);
990                 return;
991         }
992
993         status = acpi_get_gpe_status(device->wakeup.gpe_device,
994                                         device->wakeup.gpe_number,
995                                                 &event_status);
996         if (status == AE_OK)
997                 device->wakeup.flags.run_wake =
998                                 !!(event_status & ACPI_EVENT_FLAG_HANDLE);
999 }
1000
1001 static void acpi_bus_get_wakeup_device_flags(struct acpi_device *device)
1002 {
1003         acpi_handle temp;
1004         acpi_status status = 0;
1005         int psw_error;
1006
1007         /* Presence of _PRW indicates wake capable */
1008         status = acpi_get_handle(device->handle, "_PRW", &temp);
1009         if (ACPI_FAILURE(status))
1010                 return;
1011
1012         status = acpi_bus_extract_wakeup_device_power_package(device->handle,
1013                                                               &device->wakeup);
1014         if (ACPI_FAILURE(status)) {
1015                 ACPI_EXCEPTION((AE_INFO, status, "Extracting _PRW package"));
1016                 return;
1017         }
1018
1019         device->wakeup.flags.valid = 1;
1020         device->wakeup.prepare_count = 0;
1021         acpi_bus_set_run_wake_flags(device);
1022         /* Call _PSW/_DSW object to disable its ability to wake the sleeping
1023          * system for the ACPI device with the _PRW object.
1024          * The _PSW object is depreciated in ACPI 3.0 and is replaced by _DSW.
1025          * So it is necessary to call _DSW object first. Only when it is not
1026          * present will the _PSW object used.
1027          */
1028         psw_error = acpi_device_sleep_wake(device, 0, 0, 0);
1029         if (psw_error)
1030                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
1031                                 "error in _DSW or _PSW evaluation\n"));
1032 }
1033
1034 static void acpi_bus_add_power_resource(acpi_handle handle);
1035
1036 static int acpi_bus_get_power_flags(struct acpi_device *device)
1037 {
1038         acpi_status status = 0;
1039         acpi_handle handle = NULL;
1040         u32 i = 0;
1041
1042
1043         /*
1044          * Power Management Flags
1045          */
1046         status = acpi_get_handle(device->handle, "_PSC", &handle);
1047         if (ACPI_SUCCESS(status))
1048                 device->power.flags.explicit_get = 1;
1049         status = acpi_get_handle(device->handle, "_IRC", &handle);
1050         if (ACPI_SUCCESS(status))
1051                 device->power.flags.inrush_current = 1;
1052
1053         /*
1054          * Enumerate supported power management states
1055          */
1056         for (i = ACPI_STATE_D0; i <= ACPI_STATE_D3_HOT; i++) {
1057                 struct acpi_device_power_state *ps = &device->power.states[i];
1058                 char object_name[5] = { '_', 'P', 'R', '0' + i, '\0' };
1059
1060                 /* Evaluate "_PRx" to se if power resources are referenced */
1061                 acpi_evaluate_reference(device->handle, object_name, NULL,
1062                                         &ps->resources);
1063                 if (ps->resources.count) {
1064                         int j;
1065
1066                         device->power.flags.power_resources = 1;
1067                         for (j = 0; j < ps->resources.count; j++)
1068                                 acpi_bus_add_power_resource(ps->resources.handles[j]);
1069                 }
1070
1071                 /* Evaluate "_PSx" to see if we can do explicit sets */
1072                 object_name[2] = 'S';
1073                 status = acpi_get_handle(device->handle, object_name, &handle);
1074                 if (ACPI_SUCCESS(status))
1075                         ps->flags.explicit_set = 1;
1076
1077                 /*
1078                  * State is valid if there are means to put the device into it.
1079                  * D3hot is only valid if _PR3 present.
1080                  */
1081                 if (ps->resources.count ||
1082                     (ps->flags.explicit_set && i < ACPI_STATE_D3_HOT)) {
1083                         ps->flags.valid = 1;
1084                         ps->flags.os_accessible = 1;
1085                 }
1086
1087                 ps->power = -1; /* Unknown - driver assigned */
1088                 ps->latency = -1;       /* Unknown - driver assigned */
1089         }
1090
1091         /* Set defaults for D0 and D3 states (always valid) */
1092         device->power.states[ACPI_STATE_D0].flags.valid = 1;
1093         device->power.states[ACPI_STATE_D0].power = 100;
1094         device->power.states[ACPI_STATE_D3].flags.valid = 1;
1095         device->power.states[ACPI_STATE_D3].power = 0;
1096
1097         /* Set D3cold's explicit_set flag if _PS3 exists. */
1098         if (device->power.states[ACPI_STATE_D3_HOT].flags.explicit_set)
1099                 device->power.states[ACPI_STATE_D3_COLD].flags.explicit_set = 1;
1100
1101         /* Presence of _PS3 or _PRx means we can put the device into D3 cold */
1102         if (device->power.states[ACPI_STATE_D3_HOT].flags.explicit_set ||
1103                         device->power.flags.power_resources)
1104                 device->power.states[ACPI_STATE_D3_COLD].flags.os_accessible = 1;
1105
1106         acpi_bus_init_power(device);
1107
1108         return 0;
1109 }
1110
1111 static int acpi_bus_get_flags(struct acpi_device *device)
1112 {
1113         acpi_status status = AE_OK;
1114         acpi_handle temp = NULL;
1115
1116
1117         /* Presence of _STA indicates 'dynamic_status' */
1118         status = acpi_get_handle(device->handle, "_STA", &temp);
1119         if (ACPI_SUCCESS(status))
1120                 device->flags.dynamic_status = 1;
1121
1122         /* Presence of _RMV indicates 'removable' */
1123         status = acpi_get_handle(device->handle, "_RMV", &temp);
1124         if (ACPI_SUCCESS(status))
1125                 device->flags.removable = 1;
1126
1127         /* Presence of _EJD|_EJ0 indicates 'ejectable' */
1128         status = acpi_get_handle(device->handle, "_EJD", &temp);
1129         if (ACPI_SUCCESS(status))
1130                 device->flags.ejectable = 1;
1131         else {
1132                 status = acpi_get_handle(device->handle, "_EJ0", &temp);
1133                 if (ACPI_SUCCESS(status))
1134                         device->flags.ejectable = 1;
1135         }
1136
1137         /* Power resources cannot be power manageable. */
1138         if (device->device_type == ACPI_BUS_TYPE_POWER)
1139                 return 0;
1140
1141         /* Presence of _PS0|_PR0 indicates 'power manageable' */
1142         status = acpi_get_handle(device->handle, "_PS0", &temp);
1143         if (ACPI_FAILURE(status))
1144                 status = acpi_get_handle(device->handle, "_PR0", &temp);
1145         if (ACPI_SUCCESS(status))
1146                 device->flags.power_manageable = 1;
1147
1148         /* TBD: Performance management */
1149
1150         return 0;
1151 }
1152
1153 static void acpi_device_get_busid(struct acpi_device *device)
1154 {
1155         char bus_id[5] = { '?', 0 };
1156         struct acpi_buffer buffer = { sizeof(bus_id), bus_id };
1157         int i = 0;
1158
1159         /*
1160          * Bus ID
1161          * ------
1162          * The device's Bus ID is simply the object name.
1163          * TBD: Shouldn't this value be unique (within the ACPI namespace)?
1164          */
1165         if (ACPI_IS_ROOT_DEVICE(device)) {
1166                 strcpy(device->pnp.bus_id, "ACPI");
1167                 return;
1168         }
1169
1170         switch (device->device_type) {
1171         case ACPI_BUS_TYPE_POWER_BUTTON:
1172                 strcpy(device->pnp.bus_id, "PWRF");
1173                 break;
1174         case ACPI_BUS_TYPE_SLEEP_BUTTON:
1175                 strcpy(device->pnp.bus_id, "SLPF");
1176                 break;
1177         default:
1178                 acpi_get_name(device->handle, ACPI_SINGLE_NAME, &buffer);
1179                 /* Clean up trailing underscores (if any) */
1180                 for (i = 3; i > 1; i--) {
1181                         if (bus_id[i] == '_')
1182                                 bus_id[i] = '\0';
1183                         else
1184                                 break;
1185                 }
1186                 strcpy(device->pnp.bus_id, bus_id);
1187                 break;
1188         }
1189 }
1190
1191 /*
1192  * acpi_bay_match - see if a device is an ejectable driver bay
1193  *
1194  * If an acpi object is ejectable and has one of the ACPI ATA methods defined,
1195  * then we can safely call it an ejectable drive bay
1196  */
1197 static int acpi_bay_match(struct acpi_device *device){
1198         acpi_status status;
1199         acpi_handle handle;
1200         acpi_handle tmp;
1201         acpi_handle phandle;
1202
1203         handle = device->handle;
1204
1205         status = acpi_get_handle(handle, "_EJ0", &tmp);
1206         if (ACPI_FAILURE(status))
1207                 return -ENODEV;
1208
1209         if ((ACPI_SUCCESS(acpi_get_handle(handle, "_GTF", &tmp))) ||
1210                 (ACPI_SUCCESS(acpi_get_handle(handle, "_GTM", &tmp))) ||
1211                 (ACPI_SUCCESS(acpi_get_handle(handle, "_STM", &tmp))) ||
1212                 (ACPI_SUCCESS(acpi_get_handle(handle, "_SDD", &tmp))))
1213                 return 0;
1214
1215         if (acpi_get_parent(handle, &phandle))
1216                 return -ENODEV;
1217
1218         if ((ACPI_SUCCESS(acpi_get_handle(phandle, "_GTF", &tmp))) ||
1219                 (ACPI_SUCCESS(acpi_get_handle(phandle, "_GTM", &tmp))) ||
1220                 (ACPI_SUCCESS(acpi_get_handle(phandle, "_STM", &tmp))) ||
1221                 (ACPI_SUCCESS(acpi_get_handle(phandle, "_SDD", &tmp))))
1222                 return 0;
1223
1224         return -ENODEV;
1225 }
1226
1227 /*
1228  * acpi_dock_match - see if a device has a _DCK method
1229  */
1230 static int acpi_dock_match(struct acpi_device *device)
1231 {
1232         acpi_handle tmp;
1233         return acpi_get_handle(device->handle, "_DCK", &tmp);
1234 }
1235
1236 const char *acpi_device_hid(struct acpi_device *device)
1237 {
1238         struct acpi_hardware_id *hid;
1239
1240         if (list_empty(&device->pnp.ids))
1241                 return dummy_hid;
1242
1243         hid = list_first_entry(&device->pnp.ids, struct acpi_hardware_id, list);
1244         return hid->id;
1245 }
1246 EXPORT_SYMBOL(acpi_device_hid);
1247
1248 static void acpi_add_id(struct acpi_device *device, const char *dev_id)
1249 {
1250         struct acpi_hardware_id *id;
1251
1252         id = kmalloc(sizeof(*id), GFP_KERNEL);
1253         if (!id)
1254                 return;
1255
1256         id->id = kstrdup(dev_id, GFP_KERNEL);
1257         if (!id->id) {
1258                 kfree(id);
1259                 return;
1260         }
1261
1262         list_add_tail(&id->list, &device->pnp.ids);
1263 }
1264
1265 /*
1266  * Old IBM workstations have a DSDT bug wherein the SMBus object
1267  * lacks the SMBUS01 HID and the methods do not have the necessary "_"
1268  * prefix.  Work around this.
1269  */
1270 static int acpi_ibm_smbus_match(struct acpi_device *device)
1271 {
1272         acpi_handle h_dummy;
1273         struct acpi_buffer path = {ACPI_ALLOCATE_BUFFER, NULL};
1274         int result;
1275
1276         if (!dmi_name_in_vendors("IBM"))
1277                 return -ENODEV;
1278
1279         /* Look for SMBS object */
1280         result = acpi_get_name(device->handle, ACPI_SINGLE_NAME, &path);
1281         if (result)
1282                 return result;
1283
1284         if (strcmp("SMBS", path.pointer)) {
1285                 result = -ENODEV;
1286                 goto out;
1287         }
1288
1289         /* Does it have the necessary (but misnamed) methods? */
1290         result = -ENODEV;
1291         if (ACPI_SUCCESS(acpi_get_handle(device->handle, "SBI", &h_dummy)) &&
1292             ACPI_SUCCESS(acpi_get_handle(device->handle, "SBR", &h_dummy)) &&
1293             ACPI_SUCCESS(acpi_get_handle(device->handle, "SBW", &h_dummy)))
1294                 result = 0;
1295 out:
1296         kfree(path.pointer);
1297         return result;
1298 }
1299
1300 static void acpi_device_set_id(struct acpi_device *device)
1301 {
1302         acpi_status status;
1303         struct acpi_device_info *info;
1304         struct acpi_pnp_device_id_list *cid_list;
1305         int i;
1306
1307         switch (device->device_type) {
1308         case ACPI_BUS_TYPE_DEVICE:
1309                 if (ACPI_IS_ROOT_DEVICE(device)) {
1310                         acpi_add_id(device, ACPI_SYSTEM_HID);
1311                         break;
1312                 }
1313
1314                 status = acpi_get_object_info(device->handle, &info);
1315                 if (ACPI_FAILURE(status)) {
1316                         printk(KERN_ERR PREFIX "%s: Error reading device info\n", __func__);
1317                         return;
1318                 }
1319
1320                 if (info->valid & ACPI_VALID_HID)
1321                         acpi_add_id(device, info->hardware_id.string);
1322                 if (info->valid & ACPI_VALID_CID) {
1323                         cid_list = &info->compatible_id_list;
1324                         for (i = 0; i < cid_list->count; i++)
1325                                 acpi_add_id(device, cid_list->ids[i].string);
1326                 }
1327                 if (info->valid & ACPI_VALID_ADR) {
1328                         device->pnp.bus_address = info->address;
1329                         device->flags.bus_address = 1;
1330                 }
1331                 if (info->valid & ACPI_VALID_UID)
1332                         device->pnp.unique_id = kstrdup(info->unique_id.string,
1333                                                         GFP_KERNEL);
1334
1335                 kfree(info);
1336
1337                 /*
1338                  * Some devices don't reliably have _HIDs & _CIDs, so add
1339                  * synthetic HIDs to make sure drivers can find them.
1340                  */
1341                 if (acpi_is_video_device(device))
1342                         acpi_add_id(device, ACPI_VIDEO_HID);
1343                 else if (ACPI_SUCCESS(acpi_bay_match(device)))
1344                         acpi_add_id(device, ACPI_BAY_HID);
1345                 else if (ACPI_SUCCESS(acpi_dock_match(device)))
1346                         acpi_add_id(device, ACPI_DOCK_HID);
1347                 else if (!acpi_ibm_smbus_match(device))
1348                         acpi_add_id(device, ACPI_SMBUS_IBM_HID);
1349                 else if (!acpi_device_hid(device) &&
1350                          ACPI_IS_ROOT_DEVICE(device->parent)) {
1351                         acpi_add_id(device, ACPI_BUS_HID); /* \_SB, LNXSYBUS */
1352                         strcpy(device->pnp.device_name, ACPI_BUS_DEVICE_NAME);
1353                         strcpy(device->pnp.device_class, ACPI_BUS_CLASS);
1354                 }
1355
1356                 break;
1357         case ACPI_BUS_TYPE_POWER:
1358                 acpi_add_id(device, ACPI_POWER_HID);
1359                 break;
1360         case ACPI_BUS_TYPE_PROCESSOR:
1361                 acpi_add_id(device, ACPI_PROCESSOR_OBJECT_HID);
1362                 break;
1363         case ACPI_BUS_TYPE_THERMAL:
1364                 acpi_add_id(device, ACPI_THERMAL_HID);
1365                 break;
1366         case ACPI_BUS_TYPE_POWER_BUTTON:
1367                 acpi_add_id(device, ACPI_BUTTON_HID_POWERF);
1368                 break;
1369         case ACPI_BUS_TYPE_SLEEP_BUTTON:
1370                 acpi_add_id(device, ACPI_BUTTON_HID_SLEEPF);
1371                 break;
1372         }
1373 }
1374
1375 static int acpi_device_set_context(struct acpi_device *device)
1376 {
1377         acpi_status status;
1378
1379         /*
1380          * Context
1381          * -------
1382          * Attach this 'struct acpi_device' to the ACPI object.  This makes
1383          * resolutions from handle->device very efficient.  Fixed hardware
1384          * devices have no handles, so we skip them.
1385          */
1386         if (!device->handle)
1387                 return 0;
1388
1389         status = acpi_attach_data(device->handle,
1390                                   acpi_bus_data_handler, device);
1391         if (ACPI_SUCCESS(status))
1392                 return 0;
1393
1394         printk(KERN_ERR PREFIX "Error attaching device data\n");
1395         return -ENODEV;
1396 }
1397
1398 static int acpi_bus_remove(struct acpi_device *dev, int rmdevice)
1399 {
1400         if (!dev)
1401                 return -EINVAL;
1402
1403         dev->removal_type = ACPI_BUS_REMOVAL_EJECT;
1404         device_release_driver(&dev->dev);
1405
1406         if (!rmdevice)
1407                 return 0;
1408
1409         /*
1410          * unbind _ADR-Based Devices when hot removal
1411          */
1412         if (dev->flags.bus_address) {
1413                 if ((dev->parent) && (dev->parent->ops.unbind))
1414                         dev->parent->ops.unbind(dev);
1415         }
1416         acpi_device_unregister(dev, ACPI_BUS_REMOVAL_EJECT);
1417
1418         return 0;
1419 }
1420
1421 static int acpi_add_single_object(struct acpi_device **child,
1422                                   acpi_handle handle, int type,
1423                                   unsigned long long sta,
1424                                   struct acpi_bus_ops *ops)
1425 {
1426         int result;
1427         struct acpi_device *device;
1428         struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
1429
1430         device = kzalloc(sizeof(struct acpi_device), GFP_KERNEL);
1431         if (!device) {
1432                 printk(KERN_ERR PREFIX "Memory allocation error\n");
1433                 return -ENOMEM;
1434         }
1435
1436         INIT_LIST_HEAD(&device->pnp.ids);
1437         device->device_type = type;
1438         device->handle = handle;
1439         device->parent = acpi_bus_get_parent(handle);
1440         device->bus_ops = *ops; /* workround for not call .start */
1441         STRUCT_TO_INT(device->status) = sta;
1442
1443         acpi_device_get_busid(device);
1444
1445         /*
1446          * Flags
1447          * -----
1448          * Note that we only look for object handles -- cannot evaluate objects
1449          * until we know the device is present and properly initialized.
1450          */
1451         result = acpi_bus_get_flags(device);
1452         if (result)
1453                 goto end;
1454
1455         /*
1456          * Initialize Device
1457          * -----------------
1458          * TBD: Synch with Core's enumeration/initialization process.
1459          */
1460         acpi_device_set_id(device);
1461
1462         /*
1463          * Power Management
1464          * ----------------
1465          */
1466         if (device->flags.power_manageable) {
1467                 result = acpi_bus_get_power_flags(device);
1468                 if (result)
1469                         goto end;
1470         }
1471
1472         /*
1473          * Wakeup device management
1474          *-----------------------
1475          */
1476         acpi_bus_get_wakeup_device_flags(device);
1477
1478         /*
1479          * Performance Management
1480          * ----------------------
1481          */
1482         if (device->flags.performance_manageable) {
1483                 result = acpi_bus_get_perf_flags(device);
1484                 if (result)
1485                         goto end;
1486         }
1487
1488         if ((result = acpi_device_set_context(device)))
1489                 goto end;
1490
1491         result = acpi_device_register(device);
1492
1493         /*
1494          * Bind _ADR-Based Devices when hot add
1495          */
1496         if (device->flags.bus_address) {
1497                 if (device->parent && device->parent->ops.bind)
1498                         device->parent->ops.bind(device);
1499         }
1500
1501 end:
1502         if (!result) {
1503                 acpi_get_name(handle, ACPI_FULL_PATHNAME, &buffer);
1504                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
1505                         "Adding %s [%s] parent %s\n", dev_name(&device->dev),
1506                          (char *) buffer.pointer,
1507                          device->parent ? dev_name(&device->parent->dev) :
1508                                           "(null)"));
1509                 kfree(buffer.pointer);
1510                 *child = device;
1511         } else
1512                 acpi_device_release(&device->dev);
1513
1514         return result;
1515 }
1516
1517 #define ACPI_STA_DEFAULT (ACPI_STA_DEVICE_PRESENT | ACPI_STA_DEVICE_ENABLED | \
1518                           ACPI_STA_DEVICE_UI      | ACPI_STA_DEVICE_FUNCTIONING)
1519
1520 static void acpi_bus_add_power_resource(acpi_handle handle)
1521 {
1522         struct acpi_bus_ops ops = {
1523                 .acpi_op_add = 1,
1524                 .acpi_op_start = 1,
1525         };
1526         struct acpi_device *device = NULL;
1527
1528         acpi_bus_get_device(handle, &device);
1529         if (!device)
1530                 acpi_add_single_object(&device, handle, ACPI_BUS_TYPE_POWER,
1531                                         ACPI_STA_DEFAULT, &ops);
1532 }
1533
1534 static int acpi_bus_type_and_status(acpi_handle handle, int *type,
1535                                     unsigned long long *sta)
1536 {
1537         acpi_status status;
1538         acpi_object_type acpi_type;
1539
1540         status = acpi_get_type(handle, &acpi_type);
1541         if (ACPI_FAILURE(status))
1542                 return -ENODEV;
1543
1544         switch (acpi_type) {
1545         case ACPI_TYPE_ANY:             /* for ACPI_ROOT_OBJECT */
1546         case ACPI_TYPE_DEVICE:
1547                 *type = ACPI_BUS_TYPE_DEVICE;
1548                 status = acpi_bus_get_status_handle(handle, sta);
1549                 if (ACPI_FAILURE(status))
1550                         return -ENODEV;
1551                 break;
1552         case ACPI_TYPE_PROCESSOR:
1553                 *type = ACPI_BUS_TYPE_PROCESSOR;
1554                 status = acpi_bus_get_status_handle(handle, sta);
1555                 if (ACPI_FAILURE(status))
1556                         return -ENODEV;
1557                 break;
1558         case ACPI_TYPE_THERMAL:
1559                 *type = ACPI_BUS_TYPE_THERMAL;
1560                 *sta = ACPI_STA_DEFAULT;
1561                 break;
1562         case ACPI_TYPE_POWER:
1563                 *type = ACPI_BUS_TYPE_POWER;
1564                 *sta = ACPI_STA_DEFAULT;
1565                 break;
1566         default:
1567                 return -ENODEV;
1568         }
1569
1570         return 0;
1571 }
1572
1573 static acpi_status acpi_bus_check_add(acpi_handle handle, u32 lvl,
1574                                       void *context, void **return_value)
1575 {
1576         struct acpi_bus_ops *ops = context;
1577         int type;
1578         unsigned long long sta;
1579         struct acpi_device *device;
1580         acpi_status status;
1581         int result;
1582
1583         result = acpi_bus_type_and_status(handle, &type, &sta);
1584         if (result)
1585                 return AE_OK;
1586
1587         if (!(sta & ACPI_STA_DEVICE_PRESENT) &&
1588             !(sta & ACPI_STA_DEVICE_FUNCTIONING)) {
1589                 struct acpi_device_wakeup wakeup;
1590                 acpi_handle temp;
1591
1592                 status = acpi_get_handle(handle, "_PRW", &temp);
1593                 if (ACPI_SUCCESS(status))
1594                         acpi_bus_extract_wakeup_device_power_package(handle,
1595                                                                      &wakeup);
1596                 return AE_CTRL_DEPTH;
1597         }
1598
1599         /*
1600          * We may already have an acpi_device from a previous enumeration.  If
1601          * so, we needn't add it again, but we may still have to start it.
1602          */
1603         device = NULL;
1604         acpi_bus_get_device(handle, &device);
1605         if (ops->acpi_op_add && !device) {
1606                 acpi_add_single_object(&device, handle, type, sta, ops);
1607                 /* Is the device a known good platform device? */
1608                 if (device
1609                     && !acpi_match_device_ids(device, acpi_platform_device_ids))
1610                         acpi_create_platform_device(device);
1611         }
1612
1613         if (!device)
1614                 return AE_CTRL_DEPTH;
1615
1616         if (ops->acpi_op_start && !(ops->acpi_op_add)) {
1617                 status = acpi_start_single_object(device);
1618                 if (ACPI_FAILURE(status))
1619                         return AE_CTRL_DEPTH;
1620         }
1621
1622         if (!*return_value)
1623                 *return_value = device;
1624         return AE_OK;
1625 }
1626
1627 static int acpi_bus_scan(acpi_handle handle, struct acpi_bus_ops *ops,
1628                          struct acpi_device **child)
1629 {
1630         acpi_status status;
1631         void *device = NULL;
1632
1633         status = acpi_bus_check_add(handle, 0, ops, &device);
1634         if (ACPI_SUCCESS(status))
1635                 acpi_walk_namespace(ACPI_TYPE_ANY, handle, ACPI_UINT32_MAX,
1636                                     acpi_bus_check_add, NULL, ops, &device);
1637
1638         if (child)
1639                 *child = device;
1640
1641         if (device)
1642                 return 0;
1643         else
1644                 return -ENODEV;
1645 }
1646
1647 /*
1648  * acpi_bus_add and acpi_bus_start
1649  *
1650  * scan a given ACPI tree and (probably recently hot-plugged)
1651  * create and add or starts found devices.
1652  *
1653  * If no devices were found -ENODEV is returned which does not
1654  * mean that this is a real error, there just have been no suitable
1655  * ACPI objects in the table trunk from which the kernel could create
1656  * a device and add/start an appropriate driver.
1657  */
1658
1659 int
1660 acpi_bus_add(struct acpi_device **child,
1661              struct acpi_device *parent, acpi_handle handle, int type)
1662 {
1663         struct acpi_bus_ops ops;
1664
1665         memset(&ops, 0, sizeof(ops));
1666         ops.acpi_op_add = 1;
1667
1668         return acpi_bus_scan(handle, &ops, child);
1669 }
1670 EXPORT_SYMBOL(acpi_bus_add);
1671
1672 int acpi_bus_start(struct acpi_device *device)
1673 {
1674         struct acpi_bus_ops ops;
1675         int result;
1676
1677         if (!device)
1678                 return -EINVAL;
1679
1680         memset(&ops, 0, sizeof(ops));
1681         ops.acpi_op_start = 1;
1682
1683         result = acpi_bus_scan(device->handle, &ops, NULL);
1684
1685         acpi_update_all_gpes();
1686
1687         return result;
1688 }
1689 EXPORT_SYMBOL(acpi_bus_start);
1690
1691 int acpi_bus_trim(struct acpi_device *start, int rmdevice)
1692 {
1693         acpi_status status;
1694         struct acpi_device *parent, *child;
1695         acpi_handle phandle, chandle;
1696         acpi_object_type type;
1697         u32 level = 1;
1698         int err = 0;
1699
1700         parent = start;
1701         phandle = start->handle;
1702         child = chandle = NULL;
1703
1704         while ((level > 0) && parent && (!err)) {
1705                 status = acpi_get_next_object(ACPI_TYPE_ANY, phandle,
1706                                               chandle, &chandle);
1707
1708                 /*
1709                  * If this scope is exhausted then move our way back up.
1710                  */
1711                 if (ACPI_FAILURE(status)) {
1712                         level--;
1713                         chandle = phandle;
1714                         acpi_get_parent(phandle, &phandle);
1715                         child = parent;
1716                         parent = parent->parent;
1717
1718                         if (level == 0)
1719                                 err = acpi_bus_remove(child, rmdevice);
1720                         else
1721                                 err = acpi_bus_remove(child, 1);
1722
1723                         continue;
1724                 }
1725
1726                 status = acpi_get_type(chandle, &type);
1727                 if (ACPI_FAILURE(status)) {
1728                         continue;
1729                 }
1730                 /*
1731                  * If there is a device corresponding to chandle then
1732                  * parse it (depth-first).
1733                  */
1734                 if (acpi_bus_get_device(chandle, &child) == 0) {
1735                         level++;
1736                         phandle = chandle;
1737                         chandle = NULL;
1738                         parent = child;
1739                 }
1740                 continue;
1741         }
1742         return err;
1743 }
1744 EXPORT_SYMBOL_GPL(acpi_bus_trim);
1745
1746 static int acpi_bus_scan_fixed(void)
1747 {
1748         int result = 0;
1749         struct acpi_device *device = NULL;
1750         struct acpi_bus_ops ops;
1751
1752         memset(&ops, 0, sizeof(ops));
1753         ops.acpi_op_add = 1;
1754         ops.acpi_op_start = 1;
1755
1756         /*
1757          * Enumerate all fixed-feature devices.
1758          */
1759         if ((acpi_gbl_FADT.flags & ACPI_FADT_POWER_BUTTON) == 0) {
1760                 result = acpi_add_single_object(&device, NULL,
1761                                                 ACPI_BUS_TYPE_POWER_BUTTON,
1762                                                 ACPI_STA_DEFAULT,
1763                                                 &ops);
1764                 device_init_wakeup(&device->dev, true);
1765         }
1766
1767         if ((acpi_gbl_FADT.flags & ACPI_FADT_SLEEP_BUTTON) == 0) {
1768                 result = acpi_add_single_object(&device, NULL,
1769                                                 ACPI_BUS_TYPE_SLEEP_BUTTON,
1770                                                 ACPI_STA_DEFAULT,
1771                                                 &ops);
1772         }
1773
1774         return result;
1775 }
1776
1777 int __init acpi_scan_init(void)
1778 {
1779         int result;
1780         struct acpi_bus_ops ops;
1781
1782         memset(&ops, 0, sizeof(ops));
1783         ops.acpi_op_add = 1;
1784         ops.acpi_op_start = 1;
1785
1786         result = bus_register(&acpi_bus_type);
1787         if (result) {
1788                 /* We don't want to quit even if we failed to add suspend/resume */
1789                 printk(KERN_ERR PREFIX "Could not register bus type\n");
1790         }
1791
1792         acpi_power_init();
1793
1794         /*
1795          * Enumerate devices in the ACPI namespace.
1796          */
1797         result = acpi_bus_scan(ACPI_ROOT_OBJECT, &ops, &acpi_root);
1798
1799         if (!result)
1800                 result = acpi_bus_scan_fixed();
1801
1802         if (result)
1803                 acpi_device_unregister(acpi_root, ACPI_BUS_REMOVAL_NORMAL);
1804         else
1805                 acpi_update_all_gpes();
1806
1807         return result;
1808 }