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Merge branch 'acpi-enumeration'
[~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                 {"PNP0C0D", 0},
972                 {"PNP0C0C", 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                 device_set_wakeup_capable(&device->dev, true);
985                 return;
986         }
987
988         status = acpi_get_gpe_status(device->wakeup.gpe_device,
989                                         device->wakeup.gpe_number,
990                                                 &event_status);
991         if (status == AE_OK)
992                 device->wakeup.flags.run_wake =
993                                 !!(event_status & ACPI_EVENT_FLAG_HANDLE);
994 }
995
996 static void acpi_bus_get_wakeup_device_flags(struct acpi_device *device)
997 {
998         acpi_handle temp;
999         acpi_status status = 0;
1000         int psw_error;
1001
1002         /* Presence of _PRW indicates wake capable */
1003         status = acpi_get_handle(device->handle, "_PRW", &temp);
1004         if (ACPI_FAILURE(status))
1005                 return;
1006
1007         status = acpi_bus_extract_wakeup_device_power_package(device->handle,
1008                                                               &device->wakeup);
1009         if (ACPI_FAILURE(status)) {
1010                 ACPI_EXCEPTION((AE_INFO, status, "Extracting _PRW package"));
1011                 return;
1012         }
1013
1014         device->wakeup.flags.valid = 1;
1015         device->wakeup.prepare_count = 0;
1016         acpi_bus_set_run_wake_flags(device);
1017         /* Call _PSW/_DSW object to disable its ability to wake the sleeping
1018          * system for the ACPI device with the _PRW object.
1019          * The _PSW object is depreciated in ACPI 3.0 and is replaced by _DSW.
1020          * So it is necessary to call _DSW object first. Only when it is not
1021          * present will the _PSW object used.
1022          */
1023         psw_error = acpi_device_sleep_wake(device, 0, 0, 0);
1024         if (psw_error)
1025                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
1026                                 "error in _DSW or _PSW evaluation\n"));
1027 }
1028
1029 static void acpi_bus_add_power_resource(acpi_handle handle);
1030
1031 static int acpi_bus_get_power_flags(struct acpi_device *device)
1032 {
1033         acpi_status status = 0;
1034         acpi_handle handle = NULL;
1035         u32 i = 0;
1036
1037
1038         /*
1039          * Power Management Flags
1040          */
1041         status = acpi_get_handle(device->handle, "_PSC", &handle);
1042         if (ACPI_SUCCESS(status))
1043                 device->power.flags.explicit_get = 1;
1044         status = acpi_get_handle(device->handle, "_IRC", &handle);
1045         if (ACPI_SUCCESS(status))
1046                 device->power.flags.inrush_current = 1;
1047
1048         /*
1049          * Enumerate supported power management states
1050          */
1051         for (i = ACPI_STATE_D0; i <= ACPI_STATE_D3_HOT; i++) {
1052                 struct acpi_device_power_state *ps = &device->power.states[i];
1053                 char object_name[5] = { '_', 'P', 'R', '0' + i, '\0' };
1054
1055                 /* Evaluate "_PRx" to se if power resources are referenced */
1056                 acpi_evaluate_reference(device->handle, object_name, NULL,
1057                                         &ps->resources);
1058                 if (ps->resources.count) {
1059                         int j;
1060
1061                         device->power.flags.power_resources = 1;
1062                         for (j = 0; j < ps->resources.count; j++)
1063                                 acpi_bus_add_power_resource(ps->resources.handles[j]);
1064                 }
1065
1066                 /* Evaluate "_PSx" to see if we can do explicit sets */
1067                 object_name[2] = 'S';
1068                 status = acpi_get_handle(device->handle, object_name, &handle);
1069                 if (ACPI_SUCCESS(status))
1070                         ps->flags.explicit_set = 1;
1071
1072                 /*
1073                  * State is valid if there are means to put the device into it.
1074                  * D3hot is only valid if _PR3 present.
1075                  */
1076                 if (ps->resources.count ||
1077                     (ps->flags.explicit_set && i < ACPI_STATE_D3_HOT)) {
1078                         ps->flags.valid = 1;
1079                         ps->flags.os_accessible = 1;
1080                 }
1081
1082                 ps->power = -1; /* Unknown - driver assigned */
1083                 ps->latency = -1;       /* Unknown - driver assigned */
1084         }
1085
1086         /* Set defaults for D0 and D3 states (always valid) */
1087         device->power.states[ACPI_STATE_D0].flags.valid = 1;
1088         device->power.states[ACPI_STATE_D0].power = 100;
1089         device->power.states[ACPI_STATE_D3].flags.valid = 1;
1090         device->power.states[ACPI_STATE_D3].power = 0;
1091
1092         /* Set D3cold's explicit_set flag if _PS3 exists. */
1093         if (device->power.states[ACPI_STATE_D3_HOT].flags.explicit_set)
1094                 device->power.states[ACPI_STATE_D3_COLD].flags.explicit_set = 1;
1095
1096         /* Presence of _PS3 or _PRx means we can put the device into D3 cold */
1097         if (device->power.states[ACPI_STATE_D3_HOT].flags.explicit_set ||
1098                         device->power.flags.power_resources)
1099                 device->power.states[ACPI_STATE_D3_COLD].flags.os_accessible = 1;
1100
1101         acpi_bus_init_power(device);
1102
1103         return 0;
1104 }
1105
1106 static int acpi_bus_get_flags(struct acpi_device *device)
1107 {
1108         acpi_status status = AE_OK;
1109         acpi_handle temp = NULL;
1110
1111
1112         /* Presence of _STA indicates 'dynamic_status' */
1113         status = acpi_get_handle(device->handle, "_STA", &temp);
1114         if (ACPI_SUCCESS(status))
1115                 device->flags.dynamic_status = 1;
1116
1117         /* Presence of _RMV indicates 'removable' */
1118         status = acpi_get_handle(device->handle, "_RMV", &temp);
1119         if (ACPI_SUCCESS(status))
1120                 device->flags.removable = 1;
1121
1122         /* Presence of _EJD|_EJ0 indicates 'ejectable' */
1123         status = acpi_get_handle(device->handle, "_EJD", &temp);
1124         if (ACPI_SUCCESS(status))
1125                 device->flags.ejectable = 1;
1126         else {
1127                 status = acpi_get_handle(device->handle, "_EJ0", &temp);
1128                 if (ACPI_SUCCESS(status))
1129                         device->flags.ejectable = 1;
1130         }
1131
1132         /* Power resources cannot be power manageable. */
1133         if (device->device_type == ACPI_BUS_TYPE_POWER)
1134                 return 0;
1135
1136         /* Presence of _PS0|_PR0 indicates 'power manageable' */
1137         status = acpi_get_handle(device->handle, "_PS0", &temp);
1138         if (ACPI_FAILURE(status))
1139                 status = acpi_get_handle(device->handle, "_PR0", &temp);
1140         if (ACPI_SUCCESS(status))
1141                 device->flags.power_manageable = 1;
1142
1143         /* TBD: Performance management */
1144
1145         return 0;
1146 }
1147
1148 static void acpi_device_get_busid(struct acpi_device *device)
1149 {
1150         char bus_id[5] = { '?', 0 };
1151         struct acpi_buffer buffer = { sizeof(bus_id), bus_id };
1152         int i = 0;
1153
1154         /*
1155          * Bus ID
1156          * ------
1157          * The device's Bus ID is simply the object name.
1158          * TBD: Shouldn't this value be unique (within the ACPI namespace)?
1159          */
1160         if (ACPI_IS_ROOT_DEVICE(device)) {
1161                 strcpy(device->pnp.bus_id, "ACPI");
1162                 return;
1163         }
1164
1165         switch (device->device_type) {
1166         case ACPI_BUS_TYPE_POWER_BUTTON:
1167                 strcpy(device->pnp.bus_id, "PWRF");
1168                 break;
1169         case ACPI_BUS_TYPE_SLEEP_BUTTON:
1170                 strcpy(device->pnp.bus_id, "SLPF");
1171                 break;
1172         default:
1173                 acpi_get_name(device->handle, ACPI_SINGLE_NAME, &buffer);
1174                 /* Clean up trailing underscores (if any) */
1175                 for (i = 3; i > 1; i--) {
1176                         if (bus_id[i] == '_')
1177                                 bus_id[i] = '\0';
1178                         else
1179                                 break;
1180                 }
1181                 strcpy(device->pnp.bus_id, bus_id);
1182                 break;
1183         }
1184 }
1185
1186 /*
1187  * acpi_bay_match - see if a device is an ejectable driver bay
1188  *
1189  * If an acpi object is ejectable and has one of the ACPI ATA methods defined,
1190  * then we can safely call it an ejectable drive bay
1191  */
1192 static int acpi_bay_match(struct acpi_device *device){
1193         acpi_status status;
1194         acpi_handle handle;
1195         acpi_handle tmp;
1196         acpi_handle phandle;
1197
1198         handle = device->handle;
1199
1200         status = acpi_get_handle(handle, "_EJ0", &tmp);
1201         if (ACPI_FAILURE(status))
1202                 return -ENODEV;
1203
1204         if ((ACPI_SUCCESS(acpi_get_handle(handle, "_GTF", &tmp))) ||
1205                 (ACPI_SUCCESS(acpi_get_handle(handle, "_GTM", &tmp))) ||
1206                 (ACPI_SUCCESS(acpi_get_handle(handle, "_STM", &tmp))) ||
1207                 (ACPI_SUCCESS(acpi_get_handle(handle, "_SDD", &tmp))))
1208                 return 0;
1209
1210         if (acpi_get_parent(handle, &phandle))
1211                 return -ENODEV;
1212
1213         if ((ACPI_SUCCESS(acpi_get_handle(phandle, "_GTF", &tmp))) ||
1214                 (ACPI_SUCCESS(acpi_get_handle(phandle, "_GTM", &tmp))) ||
1215                 (ACPI_SUCCESS(acpi_get_handle(phandle, "_STM", &tmp))) ||
1216                 (ACPI_SUCCESS(acpi_get_handle(phandle, "_SDD", &tmp))))
1217                 return 0;
1218
1219         return -ENODEV;
1220 }
1221
1222 /*
1223  * acpi_dock_match - see if a device has a _DCK method
1224  */
1225 static int acpi_dock_match(struct acpi_device *device)
1226 {
1227         acpi_handle tmp;
1228         return acpi_get_handle(device->handle, "_DCK", &tmp);
1229 }
1230
1231 const char *acpi_device_hid(struct acpi_device *device)
1232 {
1233         struct acpi_hardware_id *hid;
1234
1235         if (list_empty(&device->pnp.ids))
1236                 return dummy_hid;
1237
1238         hid = list_first_entry(&device->pnp.ids, struct acpi_hardware_id, list);
1239         return hid->id;
1240 }
1241 EXPORT_SYMBOL(acpi_device_hid);
1242
1243 static void acpi_add_id(struct acpi_device *device, const char *dev_id)
1244 {
1245         struct acpi_hardware_id *id;
1246
1247         id = kmalloc(sizeof(*id), GFP_KERNEL);
1248         if (!id)
1249                 return;
1250
1251         id->id = kstrdup(dev_id, GFP_KERNEL);
1252         if (!id->id) {
1253                 kfree(id);
1254                 return;
1255         }
1256
1257         list_add_tail(&id->list, &device->pnp.ids);
1258 }
1259
1260 /*
1261  * Old IBM workstations have a DSDT bug wherein the SMBus object
1262  * lacks the SMBUS01 HID and the methods do not have the necessary "_"
1263  * prefix.  Work around this.
1264  */
1265 static int acpi_ibm_smbus_match(struct acpi_device *device)
1266 {
1267         acpi_handle h_dummy;
1268         struct acpi_buffer path = {ACPI_ALLOCATE_BUFFER, NULL};
1269         int result;
1270
1271         if (!dmi_name_in_vendors("IBM"))
1272                 return -ENODEV;
1273
1274         /* Look for SMBS object */
1275         result = acpi_get_name(device->handle, ACPI_SINGLE_NAME, &path);
1276         if (result)
1277                 return result;
1278
1279         if (strcmp("SMBS", path.pointer)) {
1280                 result = -ENODEV;
1281                 goto out;
1282         }
1283
1284         /* Does it have the necessary (but misnamed) methods? */
1285         result = -ENODEV;
1286         if (ACPI_SUCCESS(acpi_get_handle(device->handle, "SBI", &h_dummy)) &&
1287             ACPI_SUCCESS(acpi_get_handle(device->handle, "SBR", &h_dummy)) &&
1288             ACPI_SUCCESS(acpi_get_handle(device->handle, "SBW", &h_dummy)))
1289                 result = 0;
1290 out:
1291         kfree(path.pointer);
1292         return result;
1293 }
1294
1295 static void acpi_device_set_id(struct acpi_device *device)
1296 {
1297         acpi_status status;
1298         struct acpi_device_info *info;
1299         struct acpi_pnp_device_id_list *cid_list;
1300         int i;
1301
1302         switch (device->device_type) {
1303         case ACPI_BUS_TYPE_DEVICE:
1304                 if (ACPI_IS_ROOT_DEVICE(device)) {
1305                         acpi_add_id(device, ACPI_SYSTEM_HID);
1306                         break;
1307                 }
1308
1309                 status = acpi_get_object_info(device->handle, &info);
1310                 if (ACPI_FAILURE(status)) {
1311                         printk(KERN_ERR PREFIX "%s: Error reading device info\n", __func__);
1312                         return;
1313                 }
1314
1315                 if (info->valid & ACPI_VALID_HID)
1316                         acpi_add_id(device, info->hardware_id.string);
1317                 if (info->valid & ACPI_VALID_CID) {
1318                         cid_list = &info->compatible_id_list;
1319                         for (i = 0; i < cid_list->count; i++)
1320                                 acpi_add_id(device, cid_list->ids[i].string);
1321                 }
1322                 if (info->valid & ACPI_VALID_ADR) {
1323                         device->pnp.bus_address = info->address;
1324                         device->flags.bus_address = 1;
1325                 }
1326                 if (info->valid & ACPI_VALID_UID)
1327                         device->pnp.unique_id = kstrdup(info->unique_id.string,
1328                                                         GFP_KERNEL);
1329
1330                 kfree(info);
1331
1332                 /*
1333                  * Some devices don't reliably have _HIDs & _CIDs, so add
1334                  * synthetic HIDs to make sure drivers can find them.
1335                  */
1336                 if (acpi_is_video_device(device))
1337                         acpi_add_id(device, ACPI_VIDEO_HID);
1338                 else if (ACPI_SUCCESS(acpi_bay_match(device)))
1339                         acpi_add_id(device, ACPI_BAY_HID);
1340                 else if (ACPI_SUCCESS(acpi_dock_match(device)))
1341                         acpi_add_id(device, ACPI_DOCK_HID);
1342                 else if (!acpi_ibm_smbus_match(device))
1343                         acpi_add_id(device, ACPI_SMBUS_IBM_HID);
1344                 else if (!acpi_device_hid(device) &&
1345                          ACPI_IS_ROOT_DEVICE(device->parent)) {
1346                         acpi_add_id(device, ACPI_BUS_HID); /* \_SB, LNXSYBUS */
1347                         strcpy(device->pnp.device_name, ACPI_BUS_DEVICE_NAME);
1348                         strcpy(device->pnp.device_class, ACPI_BUS_CLASS);
1349                 }
1350
1351                 break;
1352         case ACPI_BUS_TYPE_POWER:
1353                 acpi_add_id(device, ACPI_POWER_HID);
1354                 break;
1355         case ACPI_BUS_TYPE_PROCESSOR:
1356                 acpi_add_id(device, ACPI_PROCESSOR_OBJECT_HID);
1357                 break;
1358         case ACPI_BUS_TYPE_THERMAL:
1359                 acpi_add_id(device, ACPI_THERMAL_HID);
1360                 break;
1361         case ACPI_BUS_TYPE_POWER_BUTTON:
1362                 acpi_add_id(device, ACPI_BUTTON_HID_POWERF);
1363                 break;
1364         case ACPI_BUS_TYPE_SLEEP_BUTTON:
1365                 acpi_add_id(device, ACPI_BUTTON_HID_SLEEPF);
1366                 break;
1367         }
1368 }
1369
1370 static int acpi_device_set_context(struct acpi_device *device)
1371 {
1372         acpi_status status;
1373
1374         /*
1375          * Context
1376          * -------
1377          * Attach this 'struct acpi_device' to the ACPI object.  This makes
1378          * resolutions from handle->device very efficient.  Fixed hardware
1379          * devices have no handles, so we skip them.
1380          */
1381         if (!device->handle)
1382                 return 0;
1383
1384         status = acpi_attach_data(device->handle,
1385                                   acpi_bus_data_handler, device);
1386         if (ACPI_SUCCESS(status))
1387                 return 0;
1388
1389         printk(KERN_ERR PREFIX "Error attaching device data\n");
1390         return -ENODEV;
1391 }
1392
1393 static int acpi_bus_remove(struct acpi_device *dev, int rmdevice)
1394 {
1395         if (!dev)
1396                 return -EINVAL;
1397
1398         dev->removal_type = ACPI_BUS_REMOVAL_EJECT;
1399         device_release_driver(&dev->dev);
1400
1401         if (!rmdevice)
1402                 return 0;
1403
1404         /*
1405          * unbind _ADR-Based Devices when hot removal
1406          */
1407         if (dev->flags.bus_address) {
1408                 if ((dev->parent) && (dev->parent->ops.unbind))
1409                         dev->parent->ops.unbind(dev);
1410         }
1411         acpi_device_unregister(dev, ACPI_BUS_REMOVAL_EJECT);
1412
1413         return 0;
1414 }
1415
1416 static int acpi_add_single_object(struct acpi_device **child,
1417                                   acpi_handle handle, int type,
1418                                   unsigned long long sta,
1419                                   struct acpi_bus_ops *ops)
1420 {
1421         int result;
1422         struct acpi_device *device;
1423         struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
1424
1425         device = kzalloc(sizeof(struct acpi_device), GFP_KERNEL);
1426         if (!device) {
1427                 printk(KERN_ERR PREFIX "Memory allocation error\n");
1428                 return -ENOMEM;
1429         }
1430
1431         INIT_LIST_HEAD(&device->pnp.ids);
1432         device->device_type = type;
1433         device->handle = handle;
1434         device->parent = acpi_bus_get_parent(handle);
1435         device->bus_ops = *ops; /* workround for not call .start */
1436         STRUCT_TO_INT(device->status) = sta;
1437
1438         acpi_device_get_busid(device);
1439
1440         /*
1441          * Flags
1442          * -----
1443          * Note that we only look for object handles -- cannot evaluate objects
1444          * until we know the device is present and properly initialized.
1445          */
1446         result = acpi_bus_get_flags(device);
1447         if (result)
1448                 goto end;
1449
1450         /*
1451          * Initialize Device
1452          * -----------------
1453          * TBD: Synch with Core's enumeration/initialization process.
1454          */
1455         acpi_device_set_id(device);
1456
1457         /*
1458          * Power Management
1459          * ----------------
1460          */
1461         if (device->flags.power_manageable) {
1462                 result = acpi_bus_get_power_flags(device);
1463                 if (result)
1464                         goto end;
1465         }
1466
1467         /*
1468          * Wakeup device management
1469          *-----------------------
1470          */
1471         acpi_bus_get_wakeup_device_flags(device);
1472
1473         /*
1474          * Performance Management
1475          * ----------------------
1476          */
1477         if (device->flags.performance_manageable) {
1478                 result = acpi_bus_get_perf_flags(device);
1479                 if (result)
1480                         goto end;
1481         }
1482
1483         if ((result = acpi_device_set_context(device)))
1484                 goto end;
1485
1486         result = acpi_device_register(device);
1487
1488         /*
1489          * Bind _ADR-Based Devices when hot add
1490          */
1491         if (device->flags.bus_address) {
1492                 if (device->parent && device->parent->ops.bind)
1493                         device->parent->ops.bind(device);
1494         }
1495
1496 end:
1497         if (!result) {
1498                 acpi_get_name(handle, ACPI_FULL_PATHNAME, &buffer);
1499                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
1500                         "Adding %s [%s] parent %s\n", dev_name(&device->dev),
1501                          (char *) buffer.pointer,
1502                          device->parent ? dev_name(&device->parent->dev) :
1503                                           "(null)"));
1504                 kfree(buffer.pointer);
1505                 *child = device;
1506         } else
1507                 acpi_device_release(&device->dev);
1508
1509         return result;
1510 }
1511
1512 #define ACPI_STA_DEFAULT (ACPI_STA_DEVICE_PRESENT | ACPI_STA_DEVICE_ENABLED | \
1513                           ACPI_STA_DEVICE_UI      | ACPI_STA_DEVICE_FUNCTIONING)
1514
1515 static void acpi_bus_add_power_resource(acpi_handle handle)
1516 {
1517         struct acpi_bus_ops ops = {
1518                 .acpi_op_add = 1,
1519                 .acpi_op_start = 1,
1520         };
1521         struct acpi_device *device = NULL;
1522
1523         acpi_bus_get_device(handle, &device);
1524         if (!device)
1525                 acpi_add_single_object(&device, handle, ACPI_BUS_TYPE_POWER,
1526                                         ACPI_STA_DEFAULT, &ops);
1527 }
1528
1529 static int acpi_bus_type_and_status(acpi_handle handle, int *type,
1530                                     unsigned long long *sta)
1531 {
1532         acpi_status status;
1533         acpi_object_type acpi_type;
1534
1535         status = acpi_get_type(handle, &acpi_type);
1536         if (ACPI_FAILURE(status))
1537                 return -ENODEV;
1538
1539         switch (acpi_type) {
1540         case ACPI_TYPE_ANY:             /* for ACPI_ROOT_OBJECT */
1541         case ACPI_TYPE_DEVICE:
1542                 *type = ACPI_BUS_TYPE_DEVICE;
1543                 status = acpi_bus_get_status_handle(handle, sta);
1544                 if (ACPI_FAILURE(status))
1545                         return -ENODEV;
1546                 break;
1547         case ACPI_TYPE_PROCESSOR:
1548                 *type = ACPI_BUS_TYPE_PROCESSOR;
1549                 status = acpi_bus_get_status_handle(handle, sta);
1550                 if (ACPI_FAILURE(status))
1551                         return -ENODEV;
1552                 break;
1553         case ACPI_TYPE_THERMAL:
1554                 *type = ACPI_BUS_TYPE_THERMAL;
1555                 *sta = ACPI_STA_DEFAULT;
1556                 break;
1557         case ACPI_TYPE_POWER:
1558                 *type = ACPI_BUS_TYPE_POWER;
1559                 *sta = ACPI_STA_DEFAULT;
1560                 break;
1561         default:
1562                 return -ENODEV;
1563         }
1564
1565         return 0;
1566 }
1567
1568 static acpi_status acpi_bus_check_add(acpi_handle handle, u32 lvl,
1569                                       void *context, void **return_value)
1570 {
1571         struct acpi_bus_ops *ops = context;
1572         int type;
1573         unsigned long long sta;
1574         struct acpi_device *device;
1575         acpi_status status;
1576         int result;
1577
1578         result = acpi_bus_type_and_status(handle, &type, &sta);
1579         if (result)
1580                 return AE_OK;
1581
1582         if (!(sta & ACPI_STA_DEVICE_PRESENT) &&
1583             !(sta & ACPI_STA_DEVICE_FUNCTIONING)) {
1584                 struct acpi_device_wakeup wakeup;
1585                 acpi_handle temp;
1586
1587                 status = acpi_get_handle(handle, "_PRW", &temp);
1588                 if (ACPI_SUCCESS(status))
1589                         acpi_bus_extract_wakeup_device_power_package(handle,
1590                                                                      &wakeup);
1591                 return AE_CTRL_DEPTH;
1592         }
1593
1594         /*
1595          * We may already have an acpi_device from a previous enumeration.  If
1596          * so, we needn't add it again, but we may still have to start it.
1597          */
1598         device = NULL;
1599         acpi_bus_get_device(handle, &device);
1600         if (ops->acpi_op_add && !device) {
1601                 acpi_add_single_object(&device, handle, type, sta, ops);
1602                 /* Is the device a known good platform device? */
1603                 if (device
1604                     && !acpi_match_device_ids(device, acpi_platform_device_ids))
1605                         acpi_create_platform_device(device);
1606         }
1607
1608         if (!device)
1609                 return AE_CTRL_DEPTH;
1610
1611         if (ops->acpi_op_start && !(ops->acpi_op_add)) {
1612                 status = acpi_start_single_object(device);
1613                 if (ACPI_FAILURE(status))
1614                         return AE_CTRL_DEPTH;
1615         }
1616
1617         if (!*return_value)
1618                 *return_value = device;
1619         return AE_OK;
1620 }
1621
1622 static int acpi_bus_scan(acpi_handle handle, struct acpi_bus_ops *ops,
1623                          struct acpi_device **child)
1624 {
1625         acpi_status status;
1626         void *device = NULL;
1627
1628         status = acpi_bus_check_add(handle, 0, ops, &device);
1629         if (ACPI_SUCCESS(status))
1630                 acpi_walk_namespace(ACPI_TYPE_ANY, handle, ACPI_UINT32_MAX,
1631                                     acpi_bus_check_add, NULL, ops, &device);
1632
1633         if (child)
1634                 *child = device;
1635
1636         if (device)
1637                 return 0;
1638         else
1639                 return -ENODEV;
1640 }
1641
1642 /*
1643  * acpi_bus_add and acpi_bus_start
1644  *
1645  * scan a given ACPI tree and (probably recently hot-plugged)
1646  * create and add or starts found devices.
1647  *
1648  * If no devices were found -ENODEV is returned which does not
1649  * mean that this is a real error, there just have been no suitable
1650  * ACPI objects in the table trunk from which the kernel could create
1651  * a device and add/start an appropriate driver.
1652  */
1653
1654 int
1655 acpi_bus_add(struct acpi_device **child,
1656              struct acpi_device *parent, acpi_handle handle, int type)
1657 {
1658         struct acpi_bus_ops ops;
1659
1660         memset(&ops, 0, sizeof(ops));
1661         ops.acpi_op_add = 1;
1662
1663         return acpi_bus_scan(handle, &ops, child);
1664 }
1665 EXPORT_SYMBOL(acpi_bus_add);
1666
1667 int acpi_bus_start(struct acpi_device *device)
1668 {
1669         struct acpi_bus_ops ops;
1670         int result;
1671
1672         if (!device)
1673                 return -EINVAL;
1674
1675         memset(&ops, 0, sizeof(ops));
1676         ops.acpi_op_start = 1;
1677
1678         result = acpi_bus_scan(device->handle, &ops, NULL);
1679
1680         acpi_update_all_gpes();
1681
1682         return result;
1683 }
1684 EXPORT_SYMBOL(acpi_bus_start);
1685
1686 int acpi_bus_trim(struct acpi_device *start, int rmdevice)
1687 {
1688         acpi_status status;
1689         struct acpi_device *parent, *child;
1690         acpi_handle phandle, chandle;
1691         acpi_object_type type;
1692         u32 level = 1;
1693         int err = 0;
1694
1695         parent = start;
1696         phandle = start->handle;
1697         child = chandle = NULL;
1698
1699         while ((level > 0) && parent && (!err)) {
1700                 status = acpi_get_next_object(ACPI_TYPE_ANY, phandle,
1701                                               chandle, &chandle);
1702
1703                 /*
1704                  * If this scope is exhausted then move our way back up.
1705                  */
1706                 if (ACPI_FAILURE(status)) {
1707                         level--;
1708                         chandle = phandle;
1709                         acpi_get_parent(phandle, &phandle);
1710                         child = parent;
1711                         parent = parent->parent;
1712
1713                         if (level == 0)
1714                                 err = acpi_bus_remove(child, rmdevice);
1715                         else
1716                                 err = acpi_bus_remove(child, 1);
1717
1718                         continue;
1719                 }
1720
1721                 status = acpi_get_type(chandle, &type);
1722                 if (ACPI_FAILURE(status)) {
1723                         continue;
1724                 }
1725                 /*
1726                  * If there is a device corresponding to chandle then
1727                  * parse it (depth-first).
1728                  */
1729                 if (acpi_bus_get_device(chandle, &child) == 0) {
1730                         level++;
1731                         phandle = chandle;
1732                         chandle = NULL;
1733                         parent = child;
1734                 }
1735                 continue;
1736         }
1737         return err;
1738 }
1739 EXPORT_SYMBOL_GPL(acpi_bus_trim);
1740
1741 static int acpi_bus_scan_fixed(void)
1742 {
1743         int result = 0;
1744         struct acpi_device *device = NULL;
1745         struct acpi_bus_ops ops;
1746
1747         memset(&ops, 0, sizeof(ops));
1748         ops.acpi_op_add = 1;
1749         ops.acpi_op_start = 1;
1750
1751         /*
1752          * Enumerate all fixed-feature devices.
1753          */
1754         if ((acpi_gbl_FADT.flags & ACPI_FADT_POWER_BUTTON) == 0) {
1755                 result = acpi_add_single_object(&device, NULL,
1756                                                 ACPI_BUS_TYPE_POWER_BUTTON,
1757                                                 ACPI_STA_DEFAULT,
1758                                                 &ops);
1759                 device_init_wakeup(&device->dev, true);
1760         }
1761
1762         if ((acpi_gbl_FADT.flags & ACPI_FADT_SLEEP_BUTTON) == 0) {
1763                 result = acpi_add_single_object(&device, NULL,
1764                                                 ACPI_BUS_TYPE_SLEEP_BUTTON,
1765                                                 ACPI_STA_DEFAULT,
1766                                                 &ops);
1767         }
1768
1769         return result;
1770 }
1771
1772 int __init acpi_scan_init(void)
1773 {
1774         int result;
1775         struct acpi_bus_ops ops;
1776
1777         memset(&ops, 0, sizeof(ops));
1778         ops.acpi_op_add = 1;
1779         ops.acpi_op_start = 1;
1780
1781         result = bus_register(&acpi_bus_type);
1782         if (result) {
1783                 /* We don't want to quit even if we failed to add suspend/resume */
1784                 printk(KERN_ERR PREFIX "Could not register bus type\n");
1785         }
1786
1787         acpi_power_init();
1788
1789         /*
1790          * Enumerate devices in the ACPI namespace.
1791          */
1792         result = acpi_bus_scan(ACPI_ROOT_OBJECT, &ops, &acpi_root);
1793
1794         if (!result)
1795                 result = acpi_bus_scan_fixed();
1796
1797         if (result)
1798                 acpi_device_unregister(acpi_root, ACPI_BUS_REMOVAL_NORMAL);
1799         else
1800                 acpi_update_all_gpes();
1801
1802         return result;
1803 }