fe158fd4f1df401d74c04c612cca591f4a7d8eaf
[linux-3.10.git] / drivers / acpi / scan.c
1 /*
2  * scan.c - support for transforming the ACPI namespace into individual objects
3  */
4
5 #include <linux/module.h>
6 #include <linux/init.h>
7 #include <linux/slab.h>
8 #include <linux/kernel.h>
9 #include <linux/acpi.h>
10 #include <linux/signal.h>
11 #include <linux/kthread.h>
12 #include <linux/dmi.h>
13 #include <linux/nls.h>
14
15 #include <acpi/acpi_drivers.h>
16
17 #include "internal.h"
18
19 #define _COMPONENT              ACPI_BUS_COMPONENT
20 ACPI_MODULE_NAME("scan");
21 #define STRUCT_TO_INT(s)        (*((int*)&s))
22 extern struct acpi_device *acpi_root;
23
24 #define ACPI_BUS_CLASS                  "system_bus"
25 #define ACPI_BUS_HID                    "LNXSYBUS"
26 #define ACPI_BUS_DEVICE_NAME            "System Bus"
27
28 #define ACPI_IS_ROOT_DEVICE(device)    (!(device)->parent)
29
30 static const char *dummy_hid = "device";
31
32 static LIST_HEAD(acpi_device_list);
33 static LIST_HEAD(acpi_bus_id_list);
34 static DEFINE_MUTEX(acpi_scan_lock);
35 static LIST_HEAD(acpi_scan_handlers_list);
36 DEFINE_MUTEX(acpi_device_lock);
37 LIST_HEAD(acpi_wakeup_device_list);
38
39 struct acpi_device_bus_id{
40         char bus_id[15];
41         unsigned int instance_no;
42         struct list_head node;
43 };
44
45 void acpi_scan_lock_acquire(void)
46 {
47         mutex_lock(&acpi_scan_lock);
48 }
49 EXPORT_SYMBOL_GPL(acpi_scan_lock_acquire);
50
51 void acpi_scan_lock_release(void)
52 {
53         mutex_unlock(&acpi_scan_lock);
54 }
55 EXPORT_SYMBOL_GPL(acpi_scan_lock_release);
56
57 int acpi_scan_add_handler(struct acpi_scan_handler *handler)
58 {
59         if (!handler || !handler->attach)
60                 return -EINVAL;
61
62         list_add_tail(&handler->list_node, &acpi_scan_handlers_list);
63         return 0;
64 }
65
66 int acpi_scan_add_handler_with_hotplug(struct acpi_scan_handler *handler,
67                                        const char *hotplug_profile_name)
68 {
69         int error;
70
71         error = acpi_scan_add_handler(handler);
72         if (error)
73                 return error;
74
75         acpi_sysfs_add_hotplug_profile(&handler->hotplug, hotplug_profile_name);
76         return 0;
77 }
78
79 /*
80  * Creates hid/cid(s) string needed for modalias and uevent
81  * e.g. on a device with hid:IBM0001 and cid:ACPI0001 you get:
82  * char *modalias: "acpi:IBM0001:ACPI0001"
83 */
84 static int create_modalias(struct acpi_device *acpi_dev, char *modalias,
85                            int size)
86 {
87         int len;
88         int count;
89         struct acpi_hardware_id *id;
90
91         if (list_empty(&acpi_dev->pnp.ids))
92                 return 0;
93
94         len = snprintf(modalias, size, "acpi:");
95         size -= len;
96
97         list_for_each_entry(id, &acpi_dev->pnp.ids, list) {
98                 count = snprintf(&modalias[len], size, "%s:", id->id);
99                 if (count < 0 || count >= size)
100                         return -EINVAL;
101                 len += count;
102                 size -= count;
103         }
104
105         modalias[len] = '\0';
106         return len;
107 }
108
109 static ssize_t
110 acpi_device_modalias_show(struct device *dev, struct device_attribute *attr, char *buf) {
111         struct acpi_device *acpi_dev = to_acpi_device(dev);
112         int len;
113
114         /* Device has no HID and no CID or string is >1024 */
115         len = create_modalias(acpi_dev, buf, 1024);
116         if (len <= 0)
117                 return 0;
118         buf[len++] = '\n';
119         return len;
120 }
121 static DEVICE_ATTR(modalias, 0444, acpi_device_modalias_show, NULL);
122
123 static int acpi_scan_hot_remove(struct acpi_device *device)
124 {
125         acpi_handle handle = device->handle;
126         acpi_handle not_used;
127         struct acpi_object_list arg_list;
128         union acpi_object arg;
129         acpi_status status;
130         unsigned long long sta;
131
132         /* If there is no handle, the device node has been unregistered. */
133         if (!handle) {
134                 dev_dbg(&device->dev, "ACPI handle missing\n");
135                 put_device(&device->dev);
136                 return -EINVAL;
137         }
138
139         ACPI_DEBUG_PRINT((ACPI_DB_INFO,
140                 "Hot-removing device %s...\n", dev_name(&device->dev)));
141
142         acpi_bus_trim(device);
143         /* Device node has been unregistered. */
144         put_device(&device->dev);
145         device = NULL;
146
147         if (ACPI_SUCCESS(acpi_get_handle(handle, "_LCK", &not_used))) {
148                 arg_list.count = 1;
149                 arg_list.pointer = &arg;
150                 arg.type = ACPI_TYPE_INTEGER;
151                 arg.integer.value = 0;
152                 acpi_evaluate_object(handle, "_LCK", &arg_list, NULL);
153         }
154
155         arg_list.count = 1;
156         arg_list.pointer = &arg;
157         arg.type = ACPI_TYPE_INTEGER;
158         arg.integer.value = 1;
159
160         /*
161          * TBD: _EJD support.
162          */
163         status = acpi_evaluate_object(handle, "_EJ0", &arg_list, NULL);
164         if (ACPI_FAILURE(status)) {
165                 if (status == AE_NOT_FOUND) {
166                         return -ENODEV;
167                 } else {
168                         acpi_handle_warn(handle, "Eject failed (0x%x)\n",
169                                                                 status);
170                         return -EIO;
171                 }
172         }
173
174         /*
175          * Verify if eject was indeed successful.  If not, log an error
176          * message.  No need to call _OST since _EJ0 call was made OK.
177          */
178         status = acpi_evaluate_integer(handle, "_STA", NULL, &sta);
179         if (ACPI_FAILURE(status)) {
180                 acpi_handle_warn(handle,
181                         "Status check after eject failed (0x%x)\n", status);
182         } else if (sta & ACPI_STA_DEVICE_ENABLED) {
183                 acpi_handle_warn(handle,
184                         "Eject incomplete - status 0x%llx\n", sta);
185         }
186
187         return 0;
188 }
189
190 static void acpi_bus_device_eject(void *context)
191 {
192         acpi_handle handle = context;
193         struct acpi_device *device = NULL;
194         struct acpi_scan_handler *handler;
195         u32 ost_code = ACPI_OST_SC_NON_SPECIFIC_FAILURE;
196
197         mutex_lock(&acpi_scan_lock);
198
199         acpi_bus_get_device(handle, &device);
200         if (!device)
201                 goto err_out;
202
203         handler = device->handler;
204         if (!handler || !handler->hotplug.enabled) {
205                 ost_code = ACPI_OST_SC_EJECT_NOT_SUPPORTED;
206                 goto err_out;
207         }
208         acpi_evaluate_hotplug_ost(handle, ACPI_NOTIFY_EJECT_REQUEST,
209                                   ACPI_OST_SC_EJECT_IN_PROGRESS, NULL);
210         if (handler->hotplug.mode == AHM_CONTAINER) {
211                 device->flags.eject_pending = true;
212                 kobject_uevent(&device->dev.kobj, KOBJ_OFFLINE);
213         } else {
214                 int error;
215
216                 get_device(&device->dev);
217                 error = acpi_scan_hot_remove(device);
218                 if (error)
219                         goto err_out;
220         }
221
222  out:
223         mutex_unlock(&acpi_scan_lock);
224         return;
225
226  err_out:
227         acpi_evaluate_hotplug_ost(handle, ACPI_NOTIFY_EJECT_REQUEST, ost_code,
228                                   NULL);
229         goto out;
230 }
231
232 static void acpi_scan_bus_device_check(acpi_handle handle, u32 ost_source)
233 {
234         struct acpi_device *device = NULL;
235         u32 ost_code = ACPI_OST_SC_NON_SPECIFIC_FAILURE;
236         int error;
237
238         mutex_lock(&acpi_scan_lock);
239
240         acpi_bus_get_device(handle, &device);
241         if (device) {
242                 dev_warn(&device->dev, "Attempt to re-insert\n");
243                 goto out;
244         }
245         acpi_evaluate_hotplug_ost(handle, ost_source,
246                                   ACPI_OST_SC_INSERT_IN_PROGRESS, NULL);
247         error = acpi_bus_scan(handle);
248         if (error) {
249                 acpi_handle_warn(handle, "Namespace scan failure\n");
250                 goto out;
251         }
252         error = acpi_bus_get_device(handle, &device);
253         if (error) {
254                 acpi_handle_warn(handle, "Missing device node object\n");
255                 goto out;
256         }
257         ost_code = ACPI_OST_SC_SUCCESS;
258         if (device->handler && device->handler->hotplug.mode == AHM_CONTAINER)
259                 kobject_uevent(&device->dev.kobj, KOBJ_ONLINE);
260
261  out:
262         acpi_evaluate_hotplug_ost(handle, ost_source, ost_code, NULL);
263         mutex_unlock(&acpi_scan_lock);
264 }
265
266 static void acpi_scan_bus_check(void *context)
267 {
268         acpi_scan_bus_device_check((acpi_handle)context,
269                                    ACPI_NOTIFY_BUS_CHECK);
270 }
271
272 static void acpi_scan_device_check(void *context)
273 {
274         acpi_scan_bus_device_check((acpi_handle)context,
275                                    ACPI_NOTIFY_DEVICE_CHECK);
276 }
277
278 static void acpi_hotplug_unsupported(acpi_handle handle, u32 type)
279 {
280         u32 ost_status;
281
282         switch (type) {
283         case ACPI_NOTIFY_BUS_CHECK:
284                 acpi_handle_debug(handle,
285                         "ACPI_NOTIFY_BUS_CHECK event: unsupported\n");
286                 ost_status = ACPI_OST_SC_INSERT_NOT_SUPPORTED;
287                 break;
288         case ACPI_NOTIFY_DEVICE_CHECK:
289                 acpi_handle_debug(handle,
290                         "ACPI_NOTIFY_DEVICE_CHECK event: unsupported\n");
291                 ost_status = ACPI_OST_SC_INSERT_NOT_SUPPORTED;
292                 break;
293         case ACPI_NOTIFY_EJECT_REQUEST:
294                 acpi_handle_debug(handle,
295                         "ACPI_NOTIFY_EJECT_REQUEST event: unsupported\n");
296                 ost_status = ACPI_OST_SC_EJECT_NOT_SUPPORTED;
297                 break;
298         default:
299                 /* non-hotplug event; possibly handled by other handler */
300                 return;
301         }
302
303         acpi_evaluate_hotplug_ost(handle, type, ost_status, NULL);
304 }
305
306 static void acpi_hotplug_notify_cb(acpi_handle handle, u32 type, void *data)
307 {
308         acpi_osd_exec_callback callback;
309         struct acpi_scan_handler *handler = data;
310         acpi_status status;
311
312         if (!handler->hotplug.enabled)
313                 return acpi_hotplug_unsupported(handle, type);
314
315         switch (type) {
316         case ACPI_NOTIFY_BUS_CHECK:
317                 acpi_handle_debug(handle, "ACPI_NOTIFY_BUS_CHECK event\n");
318                 callback = acpi_scan_bus_check;
319                 break;
320         case ACPI_NOTIFY_DEVICE_CHECK:
321                 acpi_handle_debug(handle, "ACPI_NOTIFY_DEVICE_CHECK event\n");
322                 callback = acpi_scan_device_check;
323                 break;
324         case ACPI_NOTIFY_EJECT_REQUEST:
325                 acpi_handle_debug(handle, "ACPI_NOTIFY_EJECT_REQUEST event\n");
326                 callback = acpi_bus_device_eject;
327                 break;
328         default:
329                 /* non-hotplug event; possibly handled by other handler */
330                 return;
331         }
332         status = acpi_os_hotplug_execute(callback, handle);
333         if (ACPI_FAILURE(status))
334                 acpi_evaluate_hotplug_ost(handle, type,
335                                           ACPI_OST_SC_NON_SPECIFIC_FAILURE,
336                                           NULL);
337 }
338
339 /**
340  * acpi_bus_hot_remove_device: hot-remove a device and its children
341  * @context: struct acpi_eject_event pointer (freed in this func)
342  *
343  * Hot-remove a device and its children. This function frees up the
344  * memory space passed by arg context, so that the caller may call
345  * this function asynchronously through acpi_os_hotplug_execute().
346  */
347 void acpi_bus_hot_remove_device(void *context)
348 {
349         struct acpi_eject_event *ej_event = context;
350         struct acpi_device *device = ej_event->device;
351         acpi_handle handle = device->handle;
352         int error;
353
354         mutex_lock(&acpi_scan_lock);
355
356         error = acpi_scan_hot_remove(device);
357         if (error && handle)
358                 acpi_evaluate_hotplug_ost(handle, ej_event->event,
359                                           ACPI_OST_SC_NON_SPECIFIC_FAILURE,
360                                           NULL);
361
362         mutex_unlock(&acpi_scan_lock);
363         kfree(context);
364 }
365 EXPORT_SYMBOL(acpi_bus_hot_remove_device);
366
367 static ssize_t real_power_state_show(struct device *dev,
368                                      struct device_attribute *attr, char *buf)
369 {
370         struct acpi_device *adev = to_acpi_device(dev);
371         int state;
372         int ret;
373
374         ret = acpi_device_get_power(adev, &state);
375         if (ret)
376                 return ret;
377
378         return sprintf(buf, "%s\n", acpi_power_state_string(state));
379 }
380
381 static DEVICE_ATTR(real_power_state, 0444, real_power_state_show, NULL);
382
383 static ssize_t power_state_show(struct device *dev,
384                                 struct device_attribute *attr, char *buf)
385 {
386         struct acpi_device *adev = to_acpi_device(dev);
387
388         return sprintf(buf, "%s\n", acpi_power_state_string(adev->power.state));
389 }
390
391 static DEVICE_ATTR(power_state, 0444, power_state_show, NULL);
392
393 static ssize_t
394 acpi_eject_store(struct device *d, struct device_attribute *attr,
395                 const char *buf, size_t count)
396 {
397         struct acpi_device *acpi_device = to_acpi_device(d);
398         struct acpi_eject_event *ej_event;
399         acpi_object_type not_used;
400         acpi_status status;
401         u32 ost_source;
402         int ret;
403
404         if (!count || buf[0] != '1')
405                 return -EINVAL;
406
407         if ((!acpi_device->handler || !acpi_device->handler->hotplug.enabled)
408             && !acpi_device->driver)
409                 return -ENODEV;
410
411         status = acpi_get_type(acpi_device->handle, &not_used);
412         if (ACPI_FAILURE(status) || !acpi_device->flags.ejectable)
413                 return -ENODEV;
414
415         mutex_lock(&acpi_scan_lock);
416
417         if (acpi_device->flags.eject_pending) {
418                 /* ACPI eject notification event. */
419                 ost_source = ACPI_NOTIFY_EJECT_REQUEST;
420                 acpi_device->flags.eject_pending = 0;
421         } else {
422                 /* Eject initiated by user space. */
423                 ost_source = ACPI_OST_EC_OSPM_EJECT;
424         }
425         ej_event = kmalloc(sizeof(*ej_event), GFP_KERNEL);
426         if (!ej_event) {
427                 ret = -ENOMEM;
428                 goto err_out;
429         }
430         acpi_evaluate_hotplug_ost(acpi_device->handle, ost_source,
431                                   ACPI_OST_SC_EJECT_IN_PROGRESS, NULL);
432         ej_event->device = acpi_device;
433         ej_event->event = ost_source;
434         get_device(&acpi_device->dev);
435         status = acpi_os_hotplug_execute(acpi_bus_hot_remove_device, ej_event);
436         if (ACPI_FAILURE(status)) {
437                 put_device(&acpi_device->dev);
438                 kfree(ej_event);
439                 ret = status == AE_NO_MEMORY ? -ENOMEM : -EAGAIN;
440                 goto err_out;
441         }
442         ret = count;
443
444  out:
445         mutex_unlock(&acpi_scan_lock);
446         return ret;
447
448  err_out:
449         acpi_evaluate_hotplug_ost(acpi_device->handle, ost_source,
450                                   ACPI_OST_SC_NON_SPECIFIC_FAILURE, NULL);
451         goto out;
452 }
453
454 static DEVICE_ATTR(eject, 0200, NULL, acpi_eject_store);
455
456 static ssize_t
457 acpi_device_hid_show(struct device *dev, struct device_attribute *attr, char *buf) {
458         struct acpi_device *acpi_dev = to_acpi_device(dev);
459
460         return sprintf(buf, "%s\n", acpi_device_hid(acpi_dev));
461 }
462 static DEVICE_ATTR(hid, 0444, acpi_device_hid_show, NULL);
463
464 static ssize_t acpi_device_uid_show(struct device *dev,
465                                     struct device_attribute *attr, char *buf)
466 {
467         struct acpi_device *acpi_dev = to_acpi_device(dev);
468
469         return sprintf(buf, "%s\n", acpi_dev->pnp.unique_id);
470 }
471 static DEVICE_ATTR(uid, 0444, acpi_device_uid_show, NULL);
472
473 static ssize_t acpi_device_adr_show(struct device *dev,
474                                     struct device_attribute *attr, char *buf)
475 {
476         struct acpi_device *acpi_dev = to_acpi_device(dev);
477
478         return sprintf(buf, "0x%08x\n",
479                        (unsigned int)(acpi_dev->pnp.bus_address));
480 }
481 static DEVICE_ATTR(adr, 0444, acpi_device_adr_show, NULL);
482
483 static ssize_t
484 acpi_device_path_show(struct device *dev, struct device_attribute *attr, char *buf) {
485         struct acpi_device *acpi_dev = to_acpi_device(dev);
486         struct acpi_buffer path = {ACPI_ALLOCATE_BUFFER, NULL};
487         int result;
488
489         result = acpi_get_name(acpi_dev->handle, ACPI_FULL_PATHNAME, &path);
490         if (result)
491                 goto end;
492
493         result = sprintf(buf, "%s\n", (char*)path.pointer);
494         kfree(path.pointer);
495 end:
496         return result;
497 }
498 static DEVICE_ATTR(path, 0444, acpi_device_path_show, NULL);
499
500 /* sysfs file that shows description text from the ACPI _STR method */
501 static ssize_t description_show(struct device *dev,
502                                 struct device_attribute *attr,
503                                 char *buf) {
504         struct acpi_device *acpi_dev = to_acpi_device(dev);
505         int result;
506
507         if (acpi_dev->pnp.str_obj == NULL)
508                 return 0;
509
510         /*
511          * The _STR object contains a Unicode identifier for a device.
512          * We need to convert to utf-8 so it can be displayed.
513          */
514         result = utf16s_to_utf8s(
515                 (wchar_t *)acpi_dev->pnp.str_obj->buffer.pointer,
516                 acpi_dev->pnp.str_obj->buffer.length,
517                 UTF16_LITTLE_ENDIAN, buf,
518                 PAGE_SIZE);
519
520         buf[result++] = '\n';
521
522         return result;
523 }
524 static DEVICE_ATTR(description, 0444, description_show, NULL);
525
526 static ssize_t
527 acpi_device_sun_show(struct device *dev, struct device_attribute *attr,
528                      char *buf) {
529         struct acpi_device *acpi_dev = to_acpi_device(dev);
530
531         return sprintf(buf, "%lu\n", acpi_dev->pnp.sun);
532 }
533 static DEVICE_ATTR(sun, 0444, acpi_device_sun_show, NULL);
534
535 static int acpi_device_setup_files(struct acpi_device *dev)
536 {
537         struct acpi_buffer buffer = {ACPI_ALLOCATE_BUFFER, NULL};
538         acpi_status status;
539         acpi_handle temp;
540         unsigned long long sun;
541         int result = 0;
542
543         /*
544          * Devices gotten from FADT don't have a "path" attribute
545          */
546         if (dev->handle) {
547                 result = device_create_file(&dev->dev, &dev_attr_path);
548                 if (result)
549                         goto end;
550         }
551
552         if (!list_empty(&dev->pnp.ids)) {
553                 result = device_create_file(&dev->dev, &dev_attr_hid);
554                 if (result)
555                         goto end;
556
557                 result = device_create_file(&dev->dev, &dev_attr_modalias);
558                 if (result)
559                         goto end;
560         }
561
562         /*
563          * If device has _STR, 'description' file is created
564          */
565         status = acpi_get_handle(dev->handle, "_STR", &temp);
566         if (ACPI_SUCCESS(status)) {
567                 status = acpi_evaluate_object(dev->handle, "_STR",
568                                         NULL, &buffer);
569                 if (ACPI_FAILURE(status))
570                         buffer.pointer = NULL;
571                 dev->pnp.str_obj = buffer.pointer;
572                 result = device_create_file(&dev->dev, &dev_attr_description);
573                 if (result)
574                         goto end;
575         }
576
577         if (dev->pnp.type.bus_address)
578                 result = device_create_file(&dev->dev, &dev_attr_adr);
579         if (dev->pnp.unique_id)
580                 result = device_create_file(&dev->dev, &dev_attr_uid);
581
582         status = acpi_evaluate_integer(dev->handle, "_SUN", NULL, &sun);
583         if (ACPI_SUCCESS(status)) {
584                 dev->pnp.sun = (unsigned long)sun;
585                 result = device_create_file(&dev->dev, &dev_attr_sun);
586                 if (result)
587                         goto end;
588         } else {
589                 dev->pnp.sun = (unsigned long)-1;
590         }
591
592         /*
593          * If device has _EJ0, 'eject' file is created that is used to trigger
594          * hot-removal function from userland.
595          */
596         status = acpi_get_handle(dev->handle, "_EJ0", &temp);
597         if (ACPI_SUCCESS(status)) {
598                 result = device_create_file(&dev->dev, &dev_attr_eject);
599                 if (result)
600                         return result;
601         }
602
603         if (dev->flags.power_manageable) {
604                 result = device_create_file(&dev->dev, &dev_attr_power_state);
605                 if (result)
606                         return result;
607
608                 if (dev->power.flags.power_resources)
609                         result = device_create_file(&dev->dev,
610                                                     &dev_attr_real_power_state);
611         }
612
613 end:
614         return result;
615 }
616
617 static void acpi_device_remove_files(struct acpi_device *dev)
618 {
619         acpi_status status;
620         acpi_handle temp;
621
622         if (dev->flags.power_manageable) {
623                 device_remove_file(&dev->dev, &dev_attr_power_state);
624                 if (dev->power.flags.power_resources)
625                         device_remove_file(&dev->dev,
626                                            &dev_attr_real_power_state);
627         }
628
629         /*
630          * If device has _STR, remove 'description' file
631          */
632         status = acpi_get_handle(dev->handle, "_STR", &temp);
633         if (ACPI_SUCCESS(status)) {
634                 kfree(dev->pnp.str_obj);
635                 device_remove_file(&dev->dev, &dev_attr_description);
636         }
637         /*
638          * If device has _EJ0, remove 'eject' file.
639          */
640         status = acpi_get_handle(dev->handle, "_EJ0", &temp);
641         if (ACPI_SUCCESS(status))
642                 device_remove_file(&dev->dev, &dev_attr_eject);
643
644         status = acpi_get_handle(dev->handle, "_SUN", &temp);
645         if (ACPI_SUCCESS(status))
646                 device_remove_file(&dev->dev, &dev_attr_sun);
647
648         if (dev->pnp.unique_id)
649                 device_remove_file(&dev->dev, &dev_attr_uid);
650         if (dev->pnp.type.bus_address)
651                 device_remove_file(&dev->dev, &dev_attr_adr);
652         device_remove_file(&dev->dev, &dev_attr_modalias);
653         device_remove_file(&dev->dev, &dev_attr_hid);
654         if (dev->handle)
655                 device_remove_file(&dev->dev, &dev_attr_path);
656 }
657 /* --------------------------------------------------------------------------
658                         ACPI Bus operations
659    -------------------------------------------------------------------------- */
660
661 static const struct acpi_device_id *__acpi_match_device(
662         struct acpi_device *device, const struct acpi_device_id *ids)
663 {
664         const struct acpi_device_id *id;
665         struct acpi_hardware_id *hwid;
666
667         /*
668          * If the device is not present, it is unnecessary to load device
669          * driver for it.
670          */
671         if (!device->status.present)
672                 return NULL;
673
674         for (id = ids; id->id[0]; id++)
675                 list_for_each_entry(hwid, &device->pnp.ids, list)
676                         if (!strcmp((char *) id->id, hwid->id))
677                                 return id;
678
679         return NULL;
680 }
681
682 /**
683  * acpi_match_device - Match a struct device against a given list of ACPI IDs
684  * @ids: Array of struct acpi_device_id object to match against.
685  * @dev: The device structure to match.
686  *
687  * Check if @dev has a valid ACPI handle and if there is a struct acpi_device
688  * object for that handle and use that object to match against a given list of
689  * device IDs.
690  *
691  * Return a pointer to the first matching ID on success or %NULL on failure.
692  */
693 const struct acpi_device_id *acpi_match_device(const struct acpi_device_id *ids,
694                                                const struct device *dev)
695 {
696         struct acpi_device *adev;
697         acpi_handle handle = ACPI_HANDLE(dev);
698
699         if (!ids || !handle || acpi_bus_get_device(handle, &adev))
700                 return NULL;
701
702         return __acpi_match_device(adev, ids);
703 }
704 EXPORT_SYMBOL_GPL(acpi_match_device);
705
706 int acpi_match_device_ids(struct acpi_device *device,
707                           const struct acpi_device_id *ids)
708 {
709         return __acpi_match_device(device, ids) ? 0 : -ENOENT;
710 }
711 EXPORT_SYMBOL(acpi_match_device_ids);
712
713 static void acpi_free_power_resources_lists(struct acpi_device *device)
714 {
715         int i;
716
717         if (device->wakeup.flags.valid)
718                 acpi_power_resources_list_free(&device->wakeup.resources);
719
720         if (!device->flags.power_manageable)
721                 return;
722
723         for (i = ACPI_STATE_D0; i <= ACPI_STATE_D3_HOT; i++) {
724                 struct acpi_device_power_state *ps = &device->power.states[i];
725                 acpi_power_resources_list_free(&ps->resources);
726         }
727 }
728
729 static void acpi_device_release(struct device *dev)
730 {
731         struct acpi_device *acpi_dev = to_acpi_device(dev);
732
733         acpi_free_pnp_ids(&acpi_dev->pnp);
734         acpi_free_power_resources_lists(acpi_dev);
735         kfree(acpi_dev);
736 }
737
738 static int acpi_bus_match(struct device *dev, struct device_driver *drv)
739 {
740         struct acpi_device *acpi_dev = to_acpi_device(dev);
741         struct acpi_driver *acpi_drv = to_acpi_driver(drv);
742
743         return acpi_dev->flags.match_driver
744                 && !acpi_match_device_ids(acpi_dev, acpi_drv->ids);
745 }
746
747 static int acpi_device_uevent(struct device *dev, struct kobj_uevent_env *env)
748 {
749         struct acpi_device *acpi_dev = to_acpi_device(dev);
750         int len;
751
752         if (list_empty(&acpi_dev->pnp.ids))
753                 return 0;
754
755         if (add_uevent_var(env, "MODALIAS="))
756                 return -ENOMEM;
757         len = create_modalias(acpi_dev, &env->buf[env->buflen - 1],
758                               sizeof(env->buf) - env->buflen);
759         if (len >= (sizeof(env->buf) - env->buflen))
760                 return -ENOMEM;
761         env->buflen += len;
762         return 0;
763 }
764
765 static void acpi_device_notify(acpi_handle handle, u32 event, void *data)
766 {
767         struct acpi_device *device = data;
768
769         device->driver->ops.notify(device, event);
770 }
771
772 static acpi_status acpi_device_notify_fixed(void *data)
773 {
774         struct acpi_device *device = data;
775
776         /* Fixed hardware devices have no handles */
777         acpi_device_notify(NULL, ACPI_FIXED_HARDWARE_EVENT, device);
778         return AE_OK;
779 }
780
781 static int acpi_device_install_notify_handler(struct acpi_device *device)
782 {
783         acpi_status status;
784
785         if (device->device_type == ACPI_BUS_TYPE_POWER_BUTTON)
786                 status =
787                     acpi_install_fixed_event_handler(ACPI_EVENT_POWER_BUTTON,
788                                                      acpi_device_notify_fixed,
789                                                      device);
790         else if (device->device_type == ACPI_BUS_TYPE_SLEEP_BUTTON)
791                 status =
792                     acpi_install_fixed_event_handler(ACPI_EVENT_SLEEP_BUTTON,
793                                                      acpi_device_notify_fixed,
794                                                      device);
795         else
796                 status = acpi_install_notify_handler(device->handle,
797                                                      ACPI_DEVICE_NOTIFY,
798                                                      acpi_device_notify,
799                                                      device);
800
801         if (ACPI_FAILURE(status))
802                 return -EINVAL;
803         return 0;
804 }
805
806 static void acpi_device_remove_notify_handler(struct acpi_device *device)
807 {
808         if (device->device_type == ACPI_BUS_TYPE_POWER_BUTTON)
809                 acpi_remove_fixed_event_handler(ACPI_EVENT_POWER_BUTTON,
810                                                 acpi_device_notify_fixed);
811         else if (device->device_type == ACPI_BUS_TYPE_SLEEP_BUTTON)
812                 acpi_remove_fixed_event_handler(ACPI_EVENT_SLEEP_BUTTON,
813                                                 acpi_device_notify_fixed);
814         else
815                 acpi_remove_notify_handler(device->handle, ACPI_DEVICE_NOTIFY,
816                                            acpi_device_notify);
817 }
818
819 static int acpi_bus_driver_init(struct acpi_device *, struct acpi_driver *);
820 static int acpi_device_probe(struct device * dev)
821 {
822         struct acpi_device *acpi_dev = to_acpi_device(dev);
823         struct acpi_driver *acpi_drv = to_acpi_driver(dev->driver);
824         int ret;
825
826         ret = acpi_bus_driver_init(acpi_dev, acpi_drv);
827         if (!ret) {
828                 if (acpi_drv->ops.notify) {
829                         ret = acpi_device_install_notify_handler(acpi_dev);
830                         if (ret) {
831                                 if (acpi_drv->ops.remove)
832                                         acpi_drv->ops.remove(acpi_dev);
833                                 acpi_dev->driver = NULL;
834                                 acpi_dev->driver_data = NULL;
835                                 return ret;
836                         }
837                 }
838
839                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
840                         "Found driver [%s] for device [%s]\n",
841                         acpi_drv->name, acpi_dev->pnp.bus_id));
842                 get_device(dev);
843         }
844         return ret;
845 }
846
847 static int acpi_device_remove(struct device * dev)
848 {
849         struct acpi_device *acpi_dev = to_acpi_device(dev);
850         struct acpi_driver *acpi_drv = acpi_dev->driver;
851
852         if (acpi_drv) {
853                 if (acpi_drv->ops.notify)
854                         acpi_device_remove_notify_handler(acpi_dev);
855                 if (acpi_drv->ops.remove)
856                         acpi_drv->ops.remove(acpi_dev);
857         }
858         acpi_dev->driver = NULL;
859         acpi_dev->driver_data = NULL;
860
861         put_device(dev);
862         return 0;
863 }
864
865 struct bus_type acpi_bus_type = {
866         .name           = "acpi",
867         .match          = acpi_bus_match,
868         .probe          = acpi_device_probe,
869         .remove         = acpi_device_remove,
870         .uevent         = acpi_device_uevent,
871 };
872
873 int acpi_device_add(struct acpi_device *device,
874                     void (*release)(struct device *))
875 {
876         int result;
877         struct acpi_device_bus_id *acpi_device_bus_id, *new_bus_id;
878         int found = 0;
879
880         if (device->handle) {
881                 acpi_status status;
882
883                 status = acpi_attach_data(device->handle, acpi_bus_data_handler,
884                                           device);
885                 if (ACPI_FAILURE(status)) {
886                         acpi_handle_err(device->handle,
887                                         "Unable to attach device data\n");
888                         return -ENODEV;
889                 }
890         }
891
892         /*
893          * Linkage
894          * -------
895          * Link this device to its parent and siblings.
896          */
897         INIT_LIST_HEAD(&device->children);
898         INIT_LIST_HEAD(&device->node);
899         INIT_LIST_HEAD(&device->wakeup_list);
900         INIT_LIST_HEAD(&device->physical_node_list);
901         mutex_init(&device->physical_node_lock);
902         INIT_LIST_HEAD(&device->power_dependent);
903
904         new_bus_id = kzalloc(sizeof(struct acpi_device_bus_id), GFP_KERNEL);
905         if (!new_bus_id) {
906                 pr_err(PREFIX "Memory allocation error\n");
907                 result = -ENOMEM;
908                 goto err_detach;
909         }
910
911         mutex_lock(&acpi_device_lock);
912         /*
913          * Find suitable bus_id and instance number in acpi_bus_id_list
914          * If failed, create one and link it into acpi_bus_id_list
915          */
916         list_for_each_entry(acpi_device_bus_id, &acpi_bus_id_list, node) {
917                 if (!strcmp(acpi_device_bus_id->bus_id,
918                             acpi_device_hid(device))) {
919                         acpi_device_bus_id->instance_no++;
920                         found = 1;
921                         kfree(new_bus_id);
922                         break;
923                 }
924         }
925         if (!found) {
926                 acpi_device_bus_id = new_bus_id;
927                 strcpy(acpi_device_bus_id->bus_id, acpi_device_hid(device));
928                 acpi_device_bus_id->instance_no = 0;
929                 list_add_tail(&acpi_device_bus_id->node, &acpi_bus_id_list);
930         }
931         dev_set_name(&device->dev, "%s:%02x", acpi_device_bus_id->bus_id, acpi_device_bus_id->instance_no);
932
933         if (device->parent)
934                 list_add_tail(&device->node, &device->parent->children);
935
936         if (device->wakeup.flags.valid)
937                 list_add_tail(&device->wakeup_list, &acpi_wakeup_device_list);
938         mutex_unlock(&acpi_device_lock);
939
940         if (device->parent)
941                 device->dev.parent = &device->parent->dev;
942         device->dev.bus = &acpi_bus_type;
943         device->dev.release = release;
944         result = device_add(&device->dev);
945         if (result) {
946                 dev_err(&device->dev, "Error registering device\n");
947                 goto err;
948         }
949
950         result = acpi_device_setup_files(device);
951         if (result)
952                 printk(KERN_ERR PREFIX "Error creating sysfs interface for device %s\n",
953                        dev_name(&device->dev));
954
955         device->removal_type = ACPI_BUS_REMOVAL_NORMAL;
956         return 0;
957
958  err:
959         mutex_lock(&acpi_device_lock);
960         if (device->parent)
961                 list_del(&device->node);
962         list_del(&device->wakeup_list);
963         mutex_unlock(&acpi_device_lock);
964
965  err_detach:
966         acpi_detach_data(device->handle, acpi_bus_data_handler);
967         return result;
968 }
969
970 static void acpi_device_unregister(struct acpi_device *device)
971 {
972         mutex_lock(&acpi_device_lock);
973         if (device->parent)
974                 list_del(&device->node);
975
976         list_del(&device->wakeup_list);
977         mutex_unlock(&acpi_device_lock);
978
979         acpi_detach_data(device->handle, acpi_bus_data_handler);
980
981         acpi_power_add_remove_device(device, false);
982         acpi_device_remove_files(device);
983         if (device->remove)
984                 device->remove(device);
985
986         device_del(&device->dev);
987         /*
988          * Transition the device to D3cold to drop the reference counts of all
989          * power resources the device depends on and turn off the ones that have
990          * no more references.
991          */
992         acpi_device_set_power(device, ACPI_STATE_D3_COLD);
993         device->handle = NULL;
994         put_device(&device->dev);
995 }
996
997 /* --------------------------------------------------------------------------
998                                  Driver Management
999    -------------------------------------------------------------------------- */
1000 /**
1001  * acpi_bus_driver_init - add a device to a driver
1002  * @device: the device to add and initialize
1003  * @driver: driver for the device
1004  *
1005  * Used to initialize a device via its device driver.  Called whenever a
1006  * driver is bound to a device.  Invokes the driver's add() ops.
1007  */
1008 static int
1009 acpi_bus_driver_init(struct acpi_device *device, struct acpi_driver *driver)
1010 {
1011         int result = 0;
1012
1013         if (!device || !driver)
1014                 return -EINVAL;
1015
1016         if (!driver->ops.add)
1017                 return -ENOSYS;
1018
1019         result = driver->ops.add(device);
1020         if (result) {
1021                 device->driver = NULL;
1022                 device->driver_data = NULL;
1023                 return result;
1024         }
1025
1026         device->driver = driver;
1027
1028         /*
1029          * TBD - Configuration Management: Assign resources to device based
1030          * upon possible configuration and currently allocated resources.
1031          */
1032
1033         ACPI_DEBUG_PRINT((ACPI_DB_INFO,
1034                           "Driver successfully bound to device\n"));
1035         return 0;
1036 }
1037
1038 /**
1039  * acpi_bus_register_driver - register a driver with the ACPI bus
1040  * @driver: driver being registered
1041  *
1042  * Registers a driver with the ACPI bus.  Searches the namespace for all
1043  * devices that match the driver's criteria and binds.  Returns zero for
1044  * success or a negative error status for failure.
1045  */
1046 int acpi_bus_register_driver(struct acpi_driver *driver)
1047 {
1048         int ret;
1049
1050         if (acpi_disabled)
1051                 return -ENODEV;
1052         driver->drv.name = driver->name;
1053         driver->drv.bus = &acpi_bus_type;
1054         driver->drv.owner = driver->owner;
1055
1056         ret = driver_register(&driver->drv);
1057         return ret;
1058 }
1059
1060 EXPORT_SYMBOL(acpi_bus_register_driver);
1061
1062 /**
1063  * acpi_bus_unregister_driver - unregisters a driver with the APIC bus
1064  * @driver: driver to unregister
1065  *
1066  * Unregisters a driver with the ACPI bus.  Searches the namespace for all
1067  * devices that match the driver's criteria and unbinds.
1068  */
1069 void acpi_bus_unregister_driver(struct acpi_driver *driver)
1070 {
1071         driver_unregister(&driver->drv);
1072 }
1073
1074 EXPORT_SYMBOL(acpi_bus_unregister_driver);
1075
1076 /* --------------------------------------------------------------------------
1077                                  Device Enumeration
1078    -------------------------------------------------------------------------- */
1079 static struct acpi_device *acpi_bus_get_parent(acpi_handle handle)
1080 {
1081         struct acpi_device *device = NULL;
1082         acpi_status status;
1083
1084         /*
1085          * Fixed hardware devices do not appear in the namespace and do not
1086          * have handles, but we fabricate acpi_devices for them, so we have
1087          * to deal with them specially.
1088          */
1089         if (!handle)
1090                 return acpi_root;
1091
1092         do {
1093                 status = acpi_get_parent(handle, &handle);
1094                 if (ACPI_FAILURE(status))
1095                         return status == AE_NULL_ENTRY ? NULL : acpi_root;
1096         } while (acpi_bus_get_device(handle, &device));
1097         return device;
1098 }
1099
1100 acpi_status
1101 acpi_bus_get_ejd(acpi_handle handle, acpi_handle *ejd)
1102 {
1103         acpi_status status;
1104         acpi_handle tmp;
1105         struct acpi_buffer buffer = {ACPI_ALLOCATE_BUFFER, NULL};
1106         union acpi_object *obj;
1107
1108         status = acpi_get_handle(handle, "_EJD", &tmp);
1109         if (ACPI_FAILURE(status))
1110                 return status;
1111
1112         status = acpi_evaluate_object(handle, "_EJD", NULL, &buffer);
1113         if (ACPI_SUCCESS(status)) {
1114                 obj = buffer.pointer;
1115                 status = acpi_get_handle(ACPI_ROOT_OBJECT, obj->string.pointer,
1116                                          ejd);
1117                 kfree(buffer.pointer);
1118         }
1119         return status;
1120 }
1121 EXPORT_SYMBOL_GPL(acpi_bus_get_ejd);
1122
1123 void acpi_bus_data_handler(acpi_handle handle, void *context)
1124 {
1125
1126         /* TBD */
1127
1128         return;
1129 }
1130
1131 static int acpi_bus_extract_wakeup_device_power_package(acpi_handle handle,
1132                                         struct acpi_device_wakeup *wakeup)
1133 {
1134         struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
1135         union acpi_object *package = NULL;
1136         union acpi_object *element = NULL;
1137         acpi_status status;
1138         int err = -ENODATA;
1139
1140         if (!wakeup)
1141                 return -EINVAL;
1142
1143         INIT_LIST_HEAD(&wakeup->resources);
1144
1145         /* _PRW */
1146         status = acpi_evaluate_object(handle, "_PRW", NULL, &buffer);
1147         if (ACPI_FAILURE(status)) {
1148                 ACPI_EXCEPTION((AE_INFO, status, "Evaluating _PRW"));
1149                 return err;
1150         }
1151
1152         package = (union acpi_object *)buffer.pointer;
1153
1154         if (!package || package->package.count < 2)
1155                 goto out;
1156
1157         element = &(package->package.elements[0]);
1158         if (!element)
1159                 goto out;
1160
1161         if (element->type == ACPI_TYPE_PACKAGE) {
1162                 if ((element->package.count < 2) ||
1163                     (element->package.elements[0].type !=
1164                      ACPI_TYPE_LOCAL_REFERENCE)
1165                     || (element->package.elements[1].type != ACPI_TYPE_INTEGER))
1166                         goto out;
1167
1168                 wakeup->gpe_device =
1169                     element->package.elements[0].reference.handle;
1170                 wakeup->gpe_number =
1171                     (u32) element->package.elements[1].integer.value;
1172         } else if (element->type == ACPI_TYPE_INTEGER) {
1173                 wakeup->gpe_device = NULL;
1174                 wakeup->gpe_number = element->integer.value;
1175         } else {
1176                 goto out;
1177         }
1178
1179         element = &(package->package.elements[1]);
1180         if (element->type != ACPI_TYPE_INTEGER)
1181                 goto out;
1182
1183         wakeup->sleep_state = element->integer.value;
1184
1185         err = acpi_extract_power_resources(package, 2, &wakeup->resources);
1186         if (err)
1187                 goto out;
1188
1189         if (!list_empty(&wakeup->resources)) {
1190                 int sleep_state;
1191
1192                 err = acpi_power_wakeup_list_init(&wakeup->resources,
1193                                                   &sleep_state);
1194                 if (err) {
1195                         acpi_handle_warn(handle, "Retrieving current states "
1196                                          "of wakeup power resources failed\n");
1197                         acpi_power_resources_list_free(&wakeup->resources);
1198                         goto out;
1199                 }
1200                 if (sleep_state < wakeup->sleep_state) {
1201                         acpi_handle_warn(handle, "Overriding _PRW sleep state "
1202                                          "(S%d) by S%d from power resources\n",
1203                                          (int)wakeup->sleep_state, sleep_state);
1204                         wakeup->sleep_state = sleep_state;
1205                 }
1206         }
1207         acpi_setup_gpe_for_wake(handle, wakeup->gpe_device, wakeup->gpe_number);
1208
1209  out:
1210         kfree(buffer.pointer);
1211         return err;
1212 }
1213
1214 static void acpi_bus_set_run_wake_flags(struct acpi_device *device)
1215 {
1216         struct acpi_device_id button_device_ids[] = {
1217                 {"PNP0C0C", 0},
1218                 {"PNP0C0D", 0},
1219                 {"PNP0C0E", 0},
1220                 {"", 0},
1221         };
1222         acpi_status status;
1223         acpi_event_status event_status;
1224
1225         device->wakeup.flags.notifier_present = 0;
1226
1227         /* Power button, Lid switch always enable wakeup */
1228         if (!acpi_match_device_ids(device, button_device_ids)) {
1229                 device->wakeup.flags.run_wake = 1;
1230                 if (!acpi_match_device_ids(device, &button_device_ids[1])) {
1231                         /* Do not use Lid/sleep button for S5 wakeup */
1232                         if (device->wakeup.sleep_state == ACPI_STATE_S5)
1233                                 device->wakeup.sleep_state = ACPI_STATE_S4;
1234                 }
1235                 device_set_wakeup_capable(&device->dev, true);
1236                 return;
1237         }
1238
1239         status = acpi_get_gpe_status(device->wakeup.gpe_device,
1240                                         device->wakeup.gpe_number,
1241                                                 &event_status);
1242         if (status == AE_OK)
1243                 device->wakeup.flags.run_wake =
1244                                 !!(event_status & ACPI_EVENT_FLAG_HANDLE);
1245 }
1246
1247 static void acpi_bus_get_wakeup_device_flags(struct acpi_device *device)
1248 {
1249         acpi_handle temp;
1250         acpi_status status = 0;
1251         int err;
1252
1253         /* Presence of _PRW indicates wake capable */
1254         status = acpi_get_handle(device->handle, "_PRW", &temp);
1255         if (ACPI_FAILURE(status))
1256                 return;
1257
1258         err = acpi_bus_extract_wakeup_device_power_package(device->handle,
1259                                                            &device->wakeup);
1260         if (err) {
1261                 dev_err(&device->dev, "_PRW evaluation error: %d\n", err);
1262                 return;
1263         }
1264
1265         device->wakeup.flags.valid = 1;
1266         device->wakeup.prepare_count = 0;
1267         acpi_bus_set_run_wake_flags(device);
1268         /* Call _PSW/_DSW object to disable its ability to wake the sleeping
1269          * system for the ACPI device with the _PRW object.
1270          * The _PSW object is depreciated in ACPI 3.0 and is replaced by _DSW.
1271          * So it is necessary to call _DSW object first. Only when it is not
1272          * present will the _PSW object used.
1273          */
1274         err = acpi_device_sleep_wake(device, 0, 0, 0);
1275         if (err)
1276                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
1277                                 "error in _DSW or _PSW evaluation\n"));
1278 }
1279
1280 static void acpi_bus_init_power_state(struct acpi_device *device, int state)
1281 {
1282         struct acpi_device_power_state *ps = &device->power.states[state];
1283         char pathname[5] = { '_', 'P', 'R', '0' + state, '\0' };
1284         struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
1285         acpi_handle handle;
1286         acpi_status status;
1287
1288         INIT_LIST_HEAD(&ps->resources);
1289
1290         /* Evaluate "_PRx" to get referenced power resources */
1291         status = acpi_evaluate_object(device->handle, pathname, NULL, &buffer);
1292         if (ACPI_SUCCESS(status)) {
1293                 union acpi_object *package = buffer.pointer;
1294
1295                 if (buffer.length && package
1296                     && package->type == ACPI_TYPE_PACKAGE
1297                     && package->package.count) {
1298                         int err = acpi_extract_power_resources(package, 0,
1299                                                                &ps->resources);
1300                         if (!err)
1301                                 device->power.flags.power_resources = 1;
1302                 }
1303                 ACPI_FREE(buffer.pointer);
1304         }
1305
1306         /* Evaluate "_PSx" to see if we can do explicit sets */
1307         pathname[2] = 'S';
1308         status = acpi_get_handle(device->handle, pathname, &handle);
1309         if (ACPI_SUCCESS(status))
1310                 ps->flags.explicit_set = 1;
1311
1312         /*
1313          * State is valid if there are means to put the device into it.
1314          * D3hot is only valid if _PR3 present.
1315          */
1316         if (!list_empty(&ps->resources)
1317             || (ps->flags.explicit_set && state < ACPI_STATE_D3_HOT)) {
1318                 ps->flags.valid = 1;
1319                 ps->flags.os_accessible = 1;
1320         }
1321
1322         ps->power = -1;         /* Unknown - driver assigned */
1323         ps->latency = -1;       /* Unknown - driver assigned */
1324 }
1325
1326 static void acpi_bus_get_power_flags(struct acpi_device *device)
1327 {
1328         acpi_status status;
1329         acpi_handle handle;
1330         u32 i;
1331
1332         /* Presence of _PS0|_PR0 indicates 'power manageable' */
1333         status = acpi_get_handle(device->handle, "_PS0", &handle);
1334         if (ACPI_FAILURE(status)) {
1335                 status = acpi_get_handle(device->handle, "_PR0", &handle);
1336                 if (ACPI_FAILURE(status))
1337                         return;
1338         }
1339
1340         device->flags.power_manageable = 1;
1341
1342         /*
1343          * Power Management Flags
1344          */
1345         status = acpi_get_handle(device->handle, "_PSC", &handle);
1346         if (ACPI_SUCCESS(status))
1347                 device->power.flags.explicit_get = 1;
1348         status = acpi_get_handle(device->handle, "_IRC", &handle);
1349         if (ACPI_SUCCESS(status))
1350                 device->power.flags.inrush_current = 1;
1351
1352         /*
1353          * Enumerate supported power management states
1354          */
1355         for (i = ACPI_STATE_D0; i <= ACPI_STATE_D3_HOT; i++)
1356                 acpi_bus_init_power_state(device, i);
1357
1358         INIT_LIST_HEAD(&device->power.states[ACPI_STATE_D3_COLD].resources);
1359
1360         /* Set defaults for D0 and D3 states (always valid) */
1361         device->power.states[ACPI_STATE_D0].flags.valid = 1;
1362         device->power.states[ACPI_STATE_D0].power = 100;
1363         device->power.states[ACPI_STATE_D3].flags.valid = 1;
1364         device->power.states[ACPI_STATE_D3].power = 0;
1365
1366         /* Set D3cold's explicit_set flag if _PS3 exists. */
1367         if (device->power.states[ACPI_STATE_D3_HOT].flags.explicit_set)
1368                 device->power.states[ACPI_STATE_D3_COLD].flags.explicit_set = 1;
1369
1370         /* Presence of _PS3 or _PRx means we can put the device into D3 cold */
1371         if (device->power.states[ACPI_STATE_D3_HOT].flags.explicit_set ||
1372                         device->power.flags.power_resources)
1373                 device->power.states[ACPI_STATE_D3_COLD].flags.os_accessible = 1;
1374
1375         if (acpi_bus_init_power(device)) {
1376                 acpi_free_power_resources_lists(device);
1377                 device->flags.power_manageable = 0;
1378         }
1379 }
1380
1381 static void acpi_bus_get_flags(struct acpi_device *device)
1382 {
1383         acpi_status status = AE_OK;
1384         acpi_handle temp = NULL;
1385
1386         /* Presence of _STA indicates 'dynamic_status' */
1387         status = acpi_get_handle(device->handle, "_STA", &temp);
1388         if (ACPI_SUCCESS(status))
1389                 device->flags.dynamic_status = 1;
1390
1391         /* Presence of _RMV indicates 'removable' */
1392         status = acpi_get_handle(device->handle, "_RMV", &temp);
1393         if (ACPI_SUCCESS(status))
1394                 device->flags.removable = 1;
1395
1396         /* Presence of _EJD|_EJ0 indicates 'ejectable' */
1397         status = acpi_get_handle(device->handle, "_EJD", &temp);
1398         if (ACPI_SUCCESS(status))
1399                 device->flags.ejectable = 1;
1400         else {
1401                 status = acpi_get_handle(device->handle, "_EJ0", &temp);
1402                 if (ACPI_SUCCESS(status))
1403                         device->flags.ejectable = 1;
1404         }
1405 }
1406
1407 static void acpi_device_get_busid(struct acpi_device *device)
1408 {
1409         char bus_id[5] = { '?', 0 };
1410         struct acpi_buffer buffer = { sizeof(bus_id), bus_id };
1411         int i = 0;
1412
1413         /*
1414          * Bus ID
1415          * ------
1416          * The device's Bus ID is simply the object name.
1417          * TBD: Shouldn't this value be unique (within the ACPI namespace)?
1418          */
1419         if (ACPI_IS_ROOT_DEVICE(device)) {
1420                 strcpy(device->pnp.bus_id, "ACPI");
1421                 return;
1422         }
1423
1424         switch (device->device_type) {
1425         case ACPI_BUS_TYPE_POWER_BUTTON:
1426                 strcpy(device->pnp.bus_id, "PWRF");
1427                 break;
1428         case ACPI_BUS_TYPE_SLEEP_BUTTON:
1429                 strcpy(device->pnp.bus_id, "SLPF");
1430                 break;
1431         default:
1432                 acpi_get_name(device->handle, ACPI_SINGLE_NAME, &buffer);
1433                 /* Clean up trailing underscores (if any) */
1434                 for (i = 3; i > 1; i--) {
1435                         if (bus_id[i] == '_')
1436                                 bus_id[i] = '\0';
1437                         else
1438                                 break;
1439                 }
1440                 strcpy(device->pnp.bus_id, bus_id);
1441                 break;
1442         }
1443 }
1444
1445 /*
1446  * acpi_bay_match - see if an acpi object is an ejectable driver bay
1447  *
1448  * If an acpi object is ejectable and has one of the ACPI ATA methods defined,
1449  * then we can safely call it an ejectable drive bay
1450  */
1451 static int acpi_bay_match(acpi_handle handle)
1452 {
1453         acpi_status status;
1454         acpi_handle tmp;
1455         acpi_handle phandle;
1456
1457         status = acpi_get_handle(handle, "_EJ0", &tmp);
1458         if (ACPI_FAILURE(status))
1459                 return -ENODEV;
1460
1461         if ((ACPI_SUCCESS(acpi_get_handle(handle, "_GTF", &tmp))) ||
1462                 (ACPI_SUCCESS(acpi_get_handle(handle, "_GTM", &tmp))) ||
1463                 (ACPI_SUCCESS(acpi_get_handle(handle, "_STM", &tmp))) ||
1464                 (ACPI_SUCCESS(acpi_get_handle(handle, "_SDD", &tmp))))
1465                 return 0;
1466
1467         if (acpi_get_parent(handle, &phandle))
1468                 return -ENODEV;
1469
1470         if ((ACPI_SUCCESS(acpi_get_handle(phandle, "_GTF", &tmp))) ||
1471                 (ACPI_SUCCESS(acpi_get_handle(phandle, "_GTM", &tmp))) ||
1472                 (ACPI_SUCCESS(acpi_get_handle(phandle, "_STM", &tmp))) ||
1473                 (ACPI_SUCCESS(acpi_get_handle(phandle, "_SDD", &tmp))))
1474                 return 0;
1475
1476         return -ENODEV;
1477 }
1478
1479 /*
1480  * acpi_dock_match - see if an acpi object has a _DCK method
1481  */
1482 static int acpi_dock_match(acpi_handle handle)
1483 {
1484         acpi_handle tmp;
1485         return acpi_get_handle(handle, "_DCK", &tmp);
1486 }
1487
1488 const char *acpi_device_hid(struct acpi_device *device)
1489 {
1490         struct acpi_hardware_id *hid;
1491
1492         if (list_empty(&device->pnp.ids))
1493                 return dummy_hid;
1494
1495         hid = list_first_entry(&device->pnp.ids, struct acpi_hardware_id, list);
1496         return hid->id;
1497 }
1498 EXPORT_SYMBOL(acpi_device_hid);
1499
1500 static void acpi_add_id(struct acpi_device_pnp *pnp, const char *dev_id)
1501 {
1502         struct acpi_hardware_id *id;
1503
1504         id = kmalloc(sizeof(*id), GFP_KERNEL);
1505         if (!id)
1506                 return;
1507
1508         id->id = kstrdup(dev_id, GFP_KERNEL);
1509         if (!id->id) {
1510                 kfree(id);
1511                 return;
1512         }
1513
1514         list_add_tail(&id->list, &pnp->ids);
1515         pnp->type.hardware_id = 1;
1516 }
1517
1518 /*
1519  * Old IBM workstations have a DSDT bug wherein the SMBus object
1520  * lacks the SMBUS01 HID and the methods do not have the necessary "_"
1521  * prefix.  Work around this.
1522  */
1523 static int acpi_ibm_smbus_match(acpi_handle handle)
1524 {
1525         acpi_handle h_dummy;
1526         struct acpi_buffer path = {ACPI_ALLOCATE_BUFFER, NULL};
1527         int result;
1528
1529         if (!dmi_name_in_vendors("IBM"))
1530                 return -ENODEV;
1531
1532         /* Look for SMBS object */
1533         result = acpi_get_name(handle, ACPI_SINGLE_NAME, &path);
1534         if (result)
1535                 return result;
1536
1537         if (strcmp("SMBS", path.pointer)) {
1538                 result = -ENODEV;
1539                 goto out;
1540         }
1541
1542         /* Does it have the necessary (but misnamed) methods? */
1543         result = -ENODEV;
1544         if (ACPI_SUCCESS(acpi_get_handle(handle, "SBI", &h_dummy)) &&
1545             ACPI_SUCCESS(acpi_get_handle(handle, "SBR", &h_dummy)) &&
1546             ACPI_SUCCESS(acpi_get_handle(handle, "SBW", &h_dummy)))
1547                 result = 0;
1548 out:
1549         kfree(path.pointer);
1550         return result;
1551 }
1552
1553 static void acpi_set_pnp_ids(acpi_handle handle, struct acpi_device_pnp *pnp,
1554                                 int device_type)
1555 {
1556         acpi_status status;
1557         struct acpi_device_info *info;
1558         struct acpi_pnp_device_id_list *cid_list;
1559         int i;
1560
1561         switch (device_type) {
1562         case ACPI_BUS_TYPE_DEVICE:
1563                 if (handle == ACPI_ROOT_OBJECT) {
1564                         acpi_add_id(pnp, ACPI_SYSTEM_HID);
1565                         break;
1566                 }
1567
1568                 status = acpi_get_object_info(handle, &info);
1569                 if (ACPI_FAILURE(status)) {
1570                         pr_err(PREFIX "%s: Error reading device info\n",
1571                                         __func__);
1572                         return;
1573                 }
1574
1575                 if (info->valid & ACPI_VALID_HID)
1576                         acpi_add_id(pnp, info->hardware_id.string);
1577                 if (info->valid & ACPI_VALID_CID) {
1578                         cid_list = &info->compatible_id_list;
1579                         for (i = 0; i < cid_list->count; i++)
1580                                 acpi_add_id(pnp, cid_list->ids[i].string);
1581                 }
1582                 if (info->valid & ACPI_VALID_ADR) {
1583                         pnp->bus_address = info->address;
1584                         pnp->type.bus_address = 1;
1585                 }
1586                 if (info->valid & ACPI_VALID_UID)
1587                         pnp->unique_id = kstrdup(info->unique_id.string,
1588                                                         GFP_KERNEL);
1589
1590                 kfree(info);
1591
1592                 /*
1593                  * Some devices don't reliably have _HIDs & _CIDs, so add
1594                  * synthetic HIDs to make sure drivers can find them.
1595                  */
1596                 if (acpi_is_video_device(handle))
1597                         acpi_add_id(pnp, ACPI_VIDEO_HID);
1598                 else if (ACPI_SUCCESS(acpi_bay_match(handle)))
1599                         acpi_add_id(pnp, ACPI_BAY_HID);
1600                 else if (ACPI_SUCCESS(acpi_dock_match(handle)))
1601                         acpi_add_id(pnp, ACPI_DOCK_HID);
1602                 else if (!acpi_ibm_smbus_match(handle))
1603                         acpi_add_id(pnp, ACPI_SMBUS_IBM_HID);
1604                 else if (list_empty(&pnp->ids) && handle == ACPI_ROOT_OBJECT) {
1605                         acpi_add_id(pnp, ACPI_BUS_HID); /* \_SB, LNXSYBUS */
1606                         strcpy(pnp->device_name, ACPI_BUS_DEVICE_NAME);
1607                         strcpy(pnp->device_class, ACPI_BUS_CLASS);
1608                 }
1609
1610                 break;
1611         case ACPI_BUS_TYPE_POWER:
1612                 acpi_add_id(pnp, ACPI_POWER_HID);
1613                 break;
1614         case ACPI_BUS_TYPE_PROCESSOR:
1615                 acpi_add_id(pnp, ACPI_PROCESSOR_OBJECT_HID);
1616                 break;
1617         case ACPI_BUS_TYPE_THERMAL:
1618                 acpi_add_id(pnp, ACPI_THERMAL_HID);
1619                 break;
1620         case ACPI_BUS_TYPE_POWER_BUTTON:
1621                 acpi_add_id(pnp, ACPI_BUTTON_HID_POWERF);
1622                 break;
1623         case ACPI_BUS_TYPE_SLEEP_BUTTON:
1624                 acpi_add_id(pnp, ACPI_BUTTON_HID_SLEEPF);
1625                 break;
1626         }
1627 }
1628
1629 void acpi_free_pnp_ids(struct acpi_device_pnp *pnp)
1630 {
1631         struct acpi_hardware_id *id, *tmp;
1632
1633         list_for_each_entry_safe(id, tmp, &pnp->ids, list) {
1634                 kfree(id->id);
1635                 kfree(id);
1636         }
1637         kfree(pnp->unique_id);
1638 }
1639
1640 void acpi_init_device_object(struct acpi_device *device, acpi_handle handle,
1641                              int type, unsigned long long sta)
1642 {
1643         INIT_LIST_HEAD(&device->pnp.ids);
1644         device->device_type = type;
1645         device->handle = handle;
1646         device->parent = acpi_bus_get_parent(handle);
1647         STRUCT_TO_INT(device->status) = sta;
1648         acpi_device_get_busid(device);
1649         acpi_set_pnp_ids(handle, &device->pnp, type);
1650         acpi_bus_get_flags(device);
1651         device->flags.match_driver = false;
1652         device_initialize(&device->dev);
1653         dev_set_uevent_suppress(&device->dev, true);
1654 }
1655
1656 void acpi_device_add_finalize(struct acpi_device *device)
1657 {
1658         device->flags.match_driver = true;
1659         dev_set_uevent_suppress(&device->dev, false);
1660         kobject_uevent(&device->dev.kobj, KOBJ_ADD);
1661 }
1662
1663 static int acpi_add_single_object(struct acpi_device **child,
1664                                   acpi_handle handle, int type,
1665                                   unsigned long long sta)
1666 {
1667         int result;
1668         struct acpi_device *device;
1669         struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
1670
1671         device = kzalloc(sizeof(struct acpi_device), GFP_KERNEL);
1672         if (!device) {
1673                 printk(KERN_ERR PREFIX "Memory allocation error\n");
1674                 return -ENOMEM;
1675         }
1676
1677         acpi_init_device_object(device, handle, type, sta);
1678         acpi_bus_get_power_flags(device);
1679         acpi_bus_get_wakeup_device_flags(device);
1680
1681         result = acpi_device_add(device, acpi_device_release);
1682         if (result) {
1683                 acpi_device_release(&device->dev);
1684                 return result;
1685         }
1686
1687         acpi_power_add_remove_device(device, true);
1688         acpi_device_add_finalize(device);
1689         acpi_get_name(handle, ACPI_FULL_PATHNAME, &buffer);
1690         ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Added %s [%s] parent %s\n",
1691                 dev_name(&device->dev), (char *) buffer.pointer,
1692                 device->parent ? dev_name(&device->parent->dev) : "(null)"));
1693         kfree(buffer.pointer);
1694         *child = device;
1695         return 0;
1696 }
1697
1698 static int acpi_bus_type_and_status(acpi_handle handle, int *type,
1699                                     unsigned long long *sta)
1700 {
1701         acpi_status status;
1702         acpi_object_type acpi_type;
1703
1704         status = acpi_get_type(handle, &acpi_type);
1705         if (ACPI_FAILURE(status))
1706                 return -ENODEV;
1707
1708         switch (acpi_type) {
1709         case ACPI_TYPE_ANY:             /* for ACPI_ROOT_OBJECT */
1710         case ACPI_TYPE_DEVICE:
1711                 *type = ACPI_BUS_TYPE_DEVICE;
1712                 status = acpi_bus_get_status_handle(handle, sta);
1713                 if (ACPI_FAILURE(status))
1714                         return -ENODEV;
1715                 break;
1716         case ACPI_TYPE_PROCESSOR:
1717                 *type = ACPI_BUS_TYPE_PROCESSOR;
1718                 status = acpi_bus_get_status_handle(handle, sta);
1719                 if (ACPI_FAILURE(status))
1720                         return -ENODEV;
1721                 break;
1722         case ACPI_TYPE_THERMAL:
1723                 *type = ACPI_BUS_TYPE_THERMAL;
1724                 *sta = ACPI_STA_DEFAULT;
1725                 break;
1726         case ACPI_TYPE_POWER:
1727                 *type = ACPI_BUS_TYPE_POWER;
1728                 *sta = ACPI_STA_DEFAULT;
1729                 break;
1730         default:
1731                 return -ENODEV;
1732         }
1733
1734         return 0;
1735 }
1736
1737 static bool acpi_scan_handler_matching(struct acpi_scan_handler *handler,
1738                                        char *idstr,
1739                                        const struct acpi_device_id **matchid)
1740 {
1741         const struct acpi_device_id *devid;
1742
1743         for (devid = handler->ids; devid->id[0]; devid++)
1744                 if (!strcmp((char *)devid->id, idstr)) {
1745                         if (matchid)
1746                                 *matchid = devid;
1747
1748                         return true;
1749                 }
1750
1751         return false;
1752 }
1753
1754 static struct acpi_scan_handler *acpi_scan_match_handler(char *idstr,
1755                                         const struct acpi_device_id **matchid)
1756 {
1757         struct acpi_scan_handler *handler;
1758
1759         list_for_each_entry(handler, &acpi_scan_handlers_list, list_node)
1760                 if (acpi_scan_handler_matching(handler, idstr, matchid))
1761                         return handler;
1762
1763         return NULL;
1764 }
1765
1766 void acpi_scan_hotplug_enabled(struct acpi_hotplug_profile *hotplug, bool val)
1767 {
1768         if (!!hotplug->enabled == !!val)
1769                 return;
1770
1771         mutex_lock(&acpi_scan_lock);
1772
1773         hotplug->enabled = val;
1774
1775         mutex_unlock(&acpi_scan_lock);
1776 }
1777
1778 static void acpi_scan_init_hotplug(acpi_handle handle, int type)
1779 {
1780         struct acpi_device_pnp pnp = {};
1781         struct acpi_hardware_id *hwid;
1782         struct acpi_scan_handler *handler;
1783
1784         INIT_LIST_HEAD(&pnp.ids);
1785         acpi_set_pnp_ids(handle, &pnp, type);
1786
1787         if (!pnp.type.hardware_id)
1788                 return;
1789
1790         /*
1791          * This relies on the fact that acpi_install_notify_handler() will not
1792          * install the same notify handler routine twice for the same handle.
1793          */
1794         list_for_each_entry(hwid, &pnp.ids, list) {
1795                 handler = acpi_scan_match_handler(hwid->id, NULL);
1796                 if (handler) {
1797                         acpi_install_notify_handler(handle, ACPI_SYSTEM_NOTIFY,
1798                                         acpi_hotplug_notify_cb, handler);
1799                         break;
1800                 }
1801         }
1802
1803         acpi_free_pnp_ids(&pnp);
1804 }
1805
1806 static acpi_status acpi_bus_check_add(acpi_handle handle, u32 lvl_not_used,
1807                                       void *not_used, void **return_value)
1808 {
1809         struct acpi_device *device = NULL;
1810         int type;
1811         unsigned long long sta;
1812         acpi_status status;
1813         int result;
1814
1815         acpi_bus_get_device(handle, &device);
1816         if (device)
1817                 goto out;
1818
1819         result = acpi_bus_type_and_status(handle, &type, &sta);
1820         if (result)
1821                 return AE_OK;
1822
1823         if (type == ACPI_BUS_TYPE_POWER) {
1824                 acpi_add_power_resource(handle);
1825                 return AE_OK;
1826         }
1827
1828         acpi_scan_init_hotplug(handle, type);
1829
1830         if (!(sta & ACPI_STA_DEVICE_PRESENT) &&
1831             !(sta & ACPI_STA_DEVICE_FUNCTIONING)) {
1832                 struct acpi_device_wakeup wakeup;
1833                 acpi_handle temp;
1834
1835                 status = acpi_get_handle(handle, "_PRW", &temp);
1836                 if (ACPI_SUCCESS(status)) {
1837                         acpi_bus_extract_wakeup_device_power_package(handle,
1838                                                                      &wakeup);
1839                         acpi_power_resources_list_free(&wakeup.resources);
1840                 }
1841                 return AE_CTRL_DEPTH;
1842         }
1843
1844         acpi_add_single_object(&device, handle, type, sta);
1845         if (!device)
1846                 return AE_CTRL_DEPTH;
1847
1848  out:
1849         if (!*return_value)
1850                 *return_value = device;
1851
1852         return AE_OK;
1853 }
1854
1855 static int acpi_scan_attach_handler(struct acpi_device *device)
1856 {
1857         struct acpi_hardware_id *hwid;
1858         int ret = 0;
1859
1860         list_for_each_entry(hwid, &device->pnp.ids, list) {
1861                 const struct acpi_device_id *devid;
1862                 struct acpi_scan_handler *handler;
1863
1864                 handler = acpi_scan_match_handler(hwid->id, &devid);
1865                 if (handler) {
1866                         ret = handler->attach(device, devid);
1867                         if (ret > 0) {
1868                                 device->handler = handler;
1869                                 break;
1870                         } else if (ret < 0) {
1871                                 break;
1872                         }
1873                 }
1874         }
1875         return ret;
1876 }
1877
1878 static acpi_status acpi_bus_device_attach(acpi_handle handle, u32 lvl_not_used,
1879                                           void *not_used, void **ret_not_used)
1880 {
1881         struct acpi_device *device;
1882         unsigned long long sta_not_used;
1883         int ret;
1884
1885         /*
1886          * Ignore errors ignored by acpi_bus_check_add() to avoid terminating
1887          * namespace walks prematurely.
1888          */
1889         if (acpi_bus_type_and_status(handle, &ret, &sta_not_used))
1890                 return AE_OK;
1891
1892         if (acpi_bus_get_device(handle, &device))
1893                 return AE_CTRL_DEPTH;
1894
1895         ret = acpi_scan_attach_handler(device);
1896         if (ret)
1897                 return ret > 0 ? AE_OK : AE_CTRL_DEPTH;
1898
1899         ret = device_attach(&device->dev);
1900         return ret >= 0 ? AE_OK : AE_CTRL_DEPTH;
1901 }
1902
1903 /**
1904  * acpi_bus_scan - Add ACPI device node objects in a given namespace scope.
1905  * @handle: Root of the namespace scope to scan.
1906  *
1907  * Scan a given ACPI tree (probably recently hot-plugged) and create and add
1908  * found devices.
1909  *
1910  * If no devices were found, -ENODEV is returned, but it does not mean that
1911  * there has been a real error.  There just have been no suitable ACPI objects
1912  * in the table trunk from which the kernel could create a device and add an
1913  * appropriate driver.
1914  *
1915  * Must be called under acpi_scan_lock.
1916  */
1917 int acpi_bus_scan(acpi_handle handle)
1918 {
1919         void *device = NULL;
1920         int error = 0;
1921
1922         if (ACPI_SUCCESS(acpi_bus_check_add(handle, 0, NULL, &device)))
1923                 acpi_walk_namespace(ACPI_TYPE_ANY, handle, ACPI_UINT32_MAX,
1924                                     acpi_bus_check_add, NULL, NULL, &device);
1925
1926         if (!device)
1927                 error = -ENODEV;
1928         else if (ACPI_SUCCESS(acpi_bus_device_attach(handle, 0, NULL, NULL)))
1929                 acpi_walk_namespace(ACPI_TYPE_ANY, handle, ACPI_UINT32_MAX,
1930                                     acpi_bus_device_attach, NULL, NULL, NULL);
1931
1932         return error;
1933 }
1934 EXPORT_SYMBOL(acpi_bus_scan);
1935
1936 static acpi_status acpi_bus_device_detach(acpi_handle handle, u32 lvl_not_used,
1937                                           void *not_used, void **ret_not_used)
1938 {
1939         struct acpi_device *device = NULL;
1940
1941         if (!acpi_bus_get_device(handle, &device)) {
1942                 struct acpi_scan_handler *dev_handler = device->handler;
1943
1944                 device->removal_type = ACPI_BUS_REMOVAL_EJECT;
1945                 if (dev_handler) {
1946                         if (dev_handler->detach)
1947                                 dev_handler->detach(device);
1948
1949                         device->handler = NULL;
1950                 } else {
1951                         device_release_driver(&device->dev);
1952                 }
1953         }
1954         return AE_OK;
1955 }
1956
1957 static acpi_status acpi_bus_remove(acpi_handle handle, u32 lvl_not_used,
1958                                    void *not_used, void **ret_not_used)
1959 {
1960         struct acpi_device *device = NULL;
1961
1962         if (!acpi_bus_get_device(handle, &device))
1963                 acpi_device_unregister(device);
1964
1965         return AE_OK;
1966 }
1967
1968 /**
1969  * acpi_bus_trim - Remove ACPI device node and all of its descendants
1970  * @start: Root of the ACPI device nodes subtree to remove.
1971  *
1972  * Must be called under acpi_scan_lock.
1973  */
1974 void acpi_bus_trim(struct acpi_device *start)
1975 {
1976         /*
1977          * Execute acpi_bus_device_detach() as a post-order callback to detach
1978          * all ACPI drivers from the device nodes being removed.
1979          */
1980         acpi_walk_namespace(ACPI_TYPE_ANY, start->handle, ACPI_UINT32_MAX, NULL,
1981                             acpi_bus_device_detach, NULL, NULL);
1982         acpi_bus_device_detach(start->handle, 0, NULL, NULL);
1983         /*
1984          * Execute acpi_bus_remove() as a post-order callback to remove device
1985          * nodes in the given namespace scope.
1986          */
1987         acpi_walk_namespace(ACPI_TYPE_ANY, start->handle, ACPI_UINT32_MAX, NULL,
1988                             acpi_bus_remove, NULL, NULL);
1989         acpi_bus_remove(start->handle, 0, NULL, NULL);
1990 }
1991 EXPORT_SYMBOL_GPL(acpi_bus_trim);
1992
1993 static int acpi_bus_scan_fixed(void)
1994 {
1995         int result = 0;
1996
1997         /*
1998          * Enumerate all fixed-feature devices.
1999          */
2000         if (!(acpi_gbl_FADT.flags & ACPI_FADT_POWER_BUTTON)) {
2001                 struct acpi_device *device = NULL;
2002
2003                 result = acpi_add_single_object(&device, NULL,
2004                                                 ACPI_BUS_TYPE_POWER_BUTTON,
2005                                                 ACPI_STA_DEFAULT);
2006                 if (result)
2007                         return result;
2008
2009                 result = device_attach(&device->dev);
2010                 if (result < 0)
2011                         return result;
2012
2013                 device_init_wakeup(&device->dev, true);
2014         }
2015
2016         if (!(acpi_gbl_FADT.flags & ACPI_FADT_SLEEP_BUTTON)) {
2017                 struct acpi_device *device = NULL;
2018
2019                 result = acpi_add_single_object(&device, NULL,
2020                                                 ACPI_BUS_TYPE_SLEEP_BUTTON,
2021                                                 ACPI_STA_DEFAULT);
2022                 if (result)
2023                         return result;
2024
2025                 result = device_attach(&device->dev);
2026         }
2027
2028         return result < 0 ? result : 0;
2029 }
2030
2031 int __init acpi_scan_init(void)
2032 {
2033         int result;
2034
2035         result = bus_register(&acpi_bus_type);
2036         if (result) {
2037                 /* We don't want to quit even if we failed to add suspend/resume */
2038                 printk(KERN_ERR PREFIX "Could not register bus type\n");
2039         }
2040
2041         acpi_pci_root_init();
2042         acpi_pci_link_init();
2043         acpi_platform_init();
2044         acpi_lpss_init();
2045         acpi_csrt_init();
2046         acpi_container_init();
2047         acpi_memory_hotplug_init();
2048
2049         mutex_lock(&acpi_scan_lock);
2050         /*
2051          * Enumerate devices in the ACPI namespace.
2052          */
2053         result = acpi_bus_scan(ACPI_ROOT_OBJECT);
2054         if (result)
2055                 goto out;
2056
2057         result = acpi_bus_get_device(ACPI_ROOT_OBJECT, &acpi_root);
2058         if (result)
2059                 goto out;
2060
2061         result = acpi_bus_scan_fixed();
2062         if (result) {
2063                 acpi_device_unregister(acpi_root);
2064                 goto out;
2065         }
2066
2067         acpi_update_all_gpes();
2068
2069         acpi_pci_root_hp_init();
2070
2071  out:
2072         mutex_unlock(&acpi_scan_lock);
2073         return result;
2074 }