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Merge tag 'sound-3.10' of git://git.kernel.org/pub/scm/linux/kernel/git/tiwai/sound
[GitHub/mt8127/android_kernel_alcatel_ttab.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 /* Skip ACPI device objects with scan handlers attached. */
744 if (acpi_dev->handler)
745 return 0;
746
747 return acpi_dev->flags.match_driver
748 && !acpi_match_device_ids(acpi_dev, acpi_drv->ids);
749 }
750
751 static int acpi_device_uevent(struct device *dev, struct kobj_uevent_env *env)
752 {
753 struct acpi_device *acpi_dev = to_acpi_device(dev);
754 int len;
755
756 if (list_empty(&acpi_dev->pnp.ids))
757 return 0;
758
759 if (add_uevent_var(env, "MODALIAS="))
760 return -ENOMEM;
761 len = create_modalias(acpi_dev, &env->buf[env->buflen - 1],
762 sizeof(env->buf) - env->buflen);
763 if (len >= (sizeof(env->buf) - env->buflen))
764 return -ENOMEM;
765 env->buflen += len;
766 return 0;
767 }
768
769 static void acpi_device_notify(acpi_handle handle, u32 event, void *data)
770 {
771 struct acpi_device *device = data;
772
773 device->driver->ops.notify(device, event);
774 }
775
776 static acpi_status acpi_device_notify_fixed(void *data)
777 {
778 struct acpi_device *device = data;
779
780 /* Fixed hardware devices have no handles */
781 acpi_device_notify(NULL, ACPI_FIXED_HARDWARE_EVENT, device);
782 return AE_OK;
783 }
784
785 static int acpi_device_install_notify_handler(struct acpi_device *device)
786 {
787 acpi_status status;
788
789 if (device->device_type == ACPI_BUS_TYPE_POWER_BUTTON)
790 status =
791 acpi_install_fixed_event_handler(ACPI_EVENT_POWER_BUTTON,
792 acpi_device_notify_fixed,
793 device);
794 else if (device->device_type == ACPI_BUS_TYPE_SLEEP_BUTTON)
795 status =
796 acpi_install_fixed_event_handler(ACPI_EVENT_SLEEP_BUTTON,
797 acpi_device_notify_fixed,
798 device);
799 else
800 status = acpi_install_notify_handler(device->handle,
801 ACPI_DEVICE_NOTIFY,
802 acpi_device_notify,
803 device);
804
805 if (ACPI_FAILURE(status))
806 return -EINVAL;
807 return 0;
808 }
809
810 static void acpi_device_remove_notify_handler(struct acpi_device *device)
811 {
812 if (device->device_type == ACPI_BUS_TYPE_POWER_BUTTON)
813 acpi_remove_fixed_event_handler(ACPI_EVENT_POWER_BUTTON,
814 acpi_device_notify_fixed);
815 else if (device->device_type == ACPI_BUS_TYPE_SLEEP_BUTTON)
816 acpi_remove_fixed_event_handler(ACPI_EVENT_SLEEP_BUTTON,
817 acpi_device_notify_fixed);
818 else
819 acpi_remove_notify_handler(device->handle, ACPI_DEVICE_NOTIFY,
820 acpi_device_notify);
821 }
822
823 static int acpi_bus_driver_init(struct acpi_device *, struct acpi_driver *);
824 static int acpi_device_probe(struct device * dev)
825 {
826 struct acpi_device *acpi_dev = to_acpi_device(dev);
827 struct acpi_driver *acpi_drv = to_acpi_driver(dev->driver);
828 int ret;
829
830 ret = acpi_bus_driver_init(acpi_dev, acpi_drv);
831 if (!ret) {
832 if (acpi_drv->ops.notify) {
833 ret = acpi_device_install_notify_handler(acpi_dev);
834 if (ret) {
835 if (acpi_drv->ops.remove)
836 acpi_drv->ops.remove(acpi_dev);
837 acpi_dev->driver = NULL;
838 acpi_dev->driver_data = NULL;
839 return ret;
840 }
841 }
842
843 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
844 "Found driver [%s] for device [%s]\n",
845 acpi_drv->name, acpi_dev->pnp.bus_id));
846 get_device(dev);
847 }
848 return ret;
849 }
850
851 static int acpi_device_remove(struct device * dev)
852 {
853 struct acpi_device *acpi_dev = to_acpi_device(dev);
854 struct acpi_driver *acpi_drv = acpi_dev->driver;
855
856 if (acpi_drv) {
857 if (acpi_drv->ops.notify)
858 acpi_device_remove_notify_handler(acpi_dev);
859 if (acpi_drv->ops.remove)
860 acpi_drv->ops.remove(acpi_dev);
861 }
862 acpi_dev->driver = NULL;
863 acpi_dev->driver_data = NULL;
864
865 put_device(dev);
866 return 0;
867 }
868
869 struct bus_type acpi_bus_type = {
870 .name = "acpi",
871 .match = acpi_bus_match,
872 .probe = acpi_device_probe,
873 .remove = acpi_device_remove,
874 .uevent = acpi_device_uevent,
875 };
876
877 int acpi_device_add(struct acpi_device *device,
878 void (*release)(struct device *))
879 {
880 int result;
881 struct acpi_device_bus_id *acpi_device_bus_id, *new_bus_id;
882 int found = 0;
883
884 if (device->handle) {
885 acpi_status status;
886
887 status = acpi_attach_data(device->handle, acpi_bus_data_handler,
888 device);
889 if (ACPI_FAILURE(status)) {
890 acpi_handle_err(device->handle,
891 "Unable to attach device data\n");
892 return -ENODEV;
893 }
894 }
895
896 /*
897 * Linkage
898 * -------
899 * Link this device to its parent and siblings.
900 */
901 INIT_LIST_HEAD(&device->children);
902 INIT_LIST_HEAD(&device->node);
903 INIT_LIST_HEAD(&device->wakeup_list);
904 INIT_LIST_HEAD(&device->physical_node_list);
905 mutex_init(&device->physical_node_lock);
906 INIT_LIST_HEAD(&device->power_dependent);
907
908 new_bus_id = kzalloc(sizeof(struct acpi_device_bus_id), GFP_KERNEL);
909 if (!new_bus_id) {
910 pr_err(PREFIX "Memory allocation error\n");
911 result = -ENOMEM;
912 goto err_detach;
913 }
914
915 mutex_lock(&acpi_device_lock);
916 /*
917 * Find suitable bus_id and instance number in acpi_bus_id_list
918 * If failed, create one and link it into acpi_bus_id_list
919 */
920 list_for_each_entry(acpi_device_bus_id, &acpi_bus_id_list, node) {
921 if (!strcmp(acpi_device_bus_id->bus_id,
922 acpi_device_hid(device))) {
923 acpi_device_bus_id->instance_no++;
924 found = 1;
925 kfree(new_bus_id);
926 break;
927 }
928 }
929 if (!found) {
930 acpi_device_bus_id = new_bus_id;
931 strcpy(acpi_device_bus_id->bus_id, acpi_device_hid(device));
932 acpi_device_bus_id->instance_no = 0;
933 list_add_tail(&acpi_device_bus_id->node, &acpi_bus_id_list);
934 }
935 dev_set_name(&device->dev, "%s:%02x", acpi_device_bus_id->bus_id, acpi_device_bus_id->instance_no);
936
937 if (device->parent)
938 list_add_tail(&device->node, &device->parent->children);
939
940 if (device->wakeup.flags.valid)
941 list_add_tail(&device->wakeup_list, &acpi_wakeup_device_list);
942 mutex_unlock(&acpi_device_lock);
943
944 if (device->parent)
945 device->dev.parent = &device->parent->dev;
946 device->dev.bus = &acpi_bus_type;
947 device->dev.release = release;
948 result = device_add(&device->dev);
949 if (result) {
950 dev_err(&device->dev, "Error registering device\n");
951 goto err;
952 }
953
954 result = acpi_device_setup_files(device);
955 if (result)
956 printk(KERN_ERR PREFIX "Error creating sysfs interface for device %s\n",
957 dev_name(&device->dev));
958
959 device->removal_type = ACPI_BUS_REMOVAL_NORMAL;
960 return 0;
961
962 err:
963 mutex_lock(&acpi_device_lock);
964 if (device->parent)
965 list_del(&device->node);
966 list_del(&device->wakeup_list);
967 mutex_unlock(&acpi_device_lock);
968
969 err_detach:
970 acpi_detach_data(device->handle, acpi_bus_data_handler);
971 return result;
972 }
973
974 static void acpi_device_unregister(struct acpi_device *device)
975 {
976 mutex_lock(&acpi_device_lock);
977 if (device->parent)
978 list_del(&device->node);
979
980 list_del(&device->wakeup_list);
981 mutex_unlock(&acpi_device_lock);
982
983 acpi_detach_data(device->handle, acpi_bus_data_handler);
984
985 acpi_power_add_remove_device(device, false);
986 acpi_device_remove_files(device);
987 if (device->remove)
988 device->remove(device);
989
990 device_del(&device->dev);
991 /*
992 * Transition the device to D3cold to drop the reference counts of all
993 * power resources the device depends on and turn off the ones that have
994 * no more references.
995 */
996 acpi_device_set_power(device, ACPI_STATE_D3_COLD);
997 device->handle = NULL;
998 put_device(&device->dev);
999 }
1000
1001 /* --------------------------------------------------------------------------
1002 Driver Management
1003 -------------------------------------------------------------------------- */
1004 /**
1005 * acpi_bus_driver_init - add a device to a driver
1006 * @device: the device to add and initialize
1007 * @driver: driver for the device
1008 *
1009 * Used to initialize a device via its device driver. Called whenever a
1010 * driver is bound to a device. Invokes the driver's add() ops.
1011 */
1012 static int
1013 acpi_bus_driver_init(struct acpi_device *device, struct acpi_driver *driver)
1014 {
1015 int result = 0;
1016
1017 if (!device || !driver)
1018 return -EINVAL;
1019
1020 if (!driver->ops.add)
1021 return -ENOSYS;
1022
1023 result = driver->ops.add(device);
1024 if (result) {
1025 device->driver = NULL;
1026 device->driver_data = NULL;
1027 return result;
1028 }
1029
1030 device->driver = driver;
1031
1032 /*
1033 * TBD - Configuration Management: Assign resources to device based
1034 * upon possible configuration and currently allocated resources.
1035 */
1036
1037 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
1038 "Driver successfully bound to device\n"));
1039 return 0;
1040 }
1041
1042 /**
1043 * acpi_bus_register_driver - register a driver with the ACPI bus
1044 * @driver: driver being registered
1045 *
1046 * Registers a driver with the ACPI bus. Searches the namespace for all
1047 * devices that match the driver's criteria and binds. Returns zero for
1048 * success or a negative error status for failure.
1049 */
1050 int acpi_bus_register_driver(struct acpi_driver *driver)
1051 {
1052 int ret;
1053
1054 if (acpi_disabled)
1055 return -ENODEV;
1056 driver->drv.name = driver->name;
1057 driver->drv.bus = &acpi_bus_type;
1058 driver->drv.owner = driver->owner;
1059
1060 ret = driver_register(&driver->drv);
1061 return ret;
1062 }
1063
1064 EXPORT_SYMBOL(acpi_bus_register_driver);
1065
1066 /**
1067 * acpi_bus_unregister_driver - unregisters a driver with the APIC bus
1068 * @driver: driver to unregister
1069 *
1070 * Unregisters a driver with the ACPI bus. Searches the namespace for all
1071 * devices that match the driver's criteria and unbinds.
1072 */
1073 void acpi_bus_unregister_driver(struct acpi_driver *driver)
1074 {
1075 driver_unregister(&driver->drv);
1076 }
1077
1078 EXPORT_SYMBOL(acpi_bus_unregister_driver);
1079
1080 /* --------------------------------------------------------------------------
1081 Device Enumeration
1082 -------------------------------------------------------------------------- */
1083 static struct acpi_device *acpi_bus_get_parent(acpi_handle handle)
1084 {
1085 struct acpi_device *device = NULL;
1086 acpi_status status;
1087
1088 /*
1089 * Fixed hardware devices do not appear in the namespace and do not
1090 * have handles, but we fabricate acpi_devices for them, so we have
1091 * to deal with them specially.
1092 */
1093 if (!handle)
1094 return acpi_root;
1095
1096 do {
1097 status = acpi_get_parent(handle, &handle);
1098 if (ACPI_FAILURE(status))
1099 return status == AE_NULL_ENTRY ? NULL : acpi_root;
1100 } while (acpi_bus_get_device(handle, &device));
1101 return device;
1102 }
1103
1104 acpi_status
1105 acpi_bus_get_ejd(acpi_handle handle, acpi_handle *ejd)
1106 {
1107 acpi_status status;
1108 acpi_handle tmp;
1109 struct acpi_buffer buffer = {ACPI_ALLOCATE_BUFFER, NULL};
1110 union acpi_object *obj;
1111
1112 status = acpi_get_handle(handle, "_EJD", &tmp);
1113 if (ACPI_FAILURE(status))
1114 return status;
1115
1116 status = acpi_evaluate_object(handle, "_EJD", NULL, &buffer);
1117 if (ACPI_SUCCESS(status)) {
1118 obj = buffer.pointer;
1119 status = acpi_get_handle(ACPI_ROOT_OBJECT, obj->string.pointer,
1120 ejd);
1121 kfree(buffer.pointer);
1122 }
1123 return status;
1124 }
1125 EXPORT_SYMBOL_GPL(acpi_bus_get_ejd);
1126
1127 void acpi_bus_data_handler(acpi_handle handle, void *context)
1128 {
1129
1130 /* TBD */
1131
1132 return;
1133 }
1134
1135 static int acpi_bus_extract_wakeup_device_power_package(acpi_handle handle,
1136 struct acpi_device_wakeup *wakeup)
1137 {
1138 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
1139 union acpi_object *package = NULL;
1140 union acpi_object *element = NULL;
1141 acpi_status status;
1142 int err = -ENODATA;
1143
1144 if (!wakeup)
1145 return -EINVAL;
1146
1147 INIT_LIST_HEAD(&wakeup->resources);
1148
1149 /* _PRW */
1150 status = acpi_evaluate_object(handle, "_PRW", NULL, &buffer);
1151 if (ACPI_FAILURE(status)) {
1152 ACPI_EXCEPTION((AE_INFO, status, "Evaluating _PRW"));
1153 return err;
1154 }
1155
1156 package = (union acpi_object *)buffer.pointer;
1157
1158 if (!package || package->package.count < 2)
1159 goto out;
1160
1161 element = &(package->package.elements[0]);
1162 if (!element)
1163 goto out;
1164
1165 if (element->type == ACPI_TYPE_PACKAGE) {
1166 if ((element->package.count < 2) ||
1167 (element->package.elements[0].type !=
1168 ACPI_TYPE_LOCAL_REFERENCE)
1169 || (element->package.elements[1].type != ACPI_TYPE_INTEGER))
1170 goto out;
1171
1172 wakeup->gpe_device =
1173 element->package.elements[0].reference.handle;
1174 wakeup->gpe_number =
1175 (u32) element->package.elements[1].integer.value;
1176 } else if (element->type == ACPI_TYPE_INTEGER) {
1177 wakeup->gpe_device = NULL;
1178 wakeup->gpe_number = element->integer.value;
1179 } else {
1180 goto out;
1181 }
1182
1183 element = &(package->package.elements[1]);
1184 if (element->type != ACPI_TYPE_INTEGER)
1185 goto out;
1186
1187 wakeup->sleep_state = element->integer.value;
1188
1189 err = acpi_extract_power_resources(package, 2, &wakeup->resources);
1190 if (err)
1191 goto out;
1192
1193 if (!list_empty(&wakeup->resources)) {
1194 int sleep_state;
1195
1196 err = acpi_power_wakeup_list_init(&wakeup->resources,
1197 &sleep_state);
1198 if (err) {
1199 acpi_handle_warn(handle, "Retrieving current states "
1200 "of wakeup power resources failed\n");
1201 acpi_power_resources_list_free(&wakeup->resources);
1202 goto out;
1203 }
1204 if (sleep_state < wakeup->sleep_state) {
1205 acpi_handle_warn(handle, "Overriding _PRW sleep state "
1206 "(S%d) by S%d from power resources\n",
1207 (int)wakeup->sleep_state, sleep_state);
1208 wakeup->sleep_state = sleep_state;
1209 }
1210 }
1211 acpi_setup_gpe_for_wake(handle, wakeup->gpe_device, wakeup->gpe_number);
1212
1213 out:
1214 kfree(buffer.pointer);
1215 return err;
1216 }
1217
1218 static void acpi_bus_set_run_wake_flags(struct acpi_device *device)
1219 {
1220 struct acpi_device_id button_device_ids[] = {
1221 {"PNP0C0C", 0},
1222 {"PNP0C0D", 0},
1223 {"PNP0C0E", 0},
1224 {"", 0},
1225 };
1226 acpi_status status;
1227 acpi_event_status event_status;
1228
1229 device->wakeup.flags.notifier_present = 0;
1230
1231 /* Power button, Lid switch always enable wakeup */
1232 if (!acpi_match_device_ids(device, button_device_ids)) {
1233 device->wakeup.flags.run_wake = 1;
1234 if (!acpi_match_device_ids(device, &button_device_ids[1])) {
1235 /* Do not use Lid/sleep button for S5 wakeup */
1236 if (device->wakeup.sleep_state == ACPI_STATE_S5)
1237 device->wakeup.sleep_state = ACPI_STATE_S4;
1238 }
1239 device_set_wakeup_capable(&device->dev, true);
1240 return;
1241 }
1242
1243 status = acpi_get_gpe_status(device->wakeup.gpe_device,
1244 device->wakeup.gpe_number,
1245 &event_status);
1246 if (status == AE_OK)
1247 device->wakeup.flags.run_wake =
1248 !!(event_status & ACPI_EVENT_FLAG_HANDLE);
1249 }
1250
1251 static void acpi_bus_get_wakeup_device_flags(struct acpi_device *device)
1252 {
1253 acpi_handle temp;
1254 acpi_status status = 0;
1255 int err;
1256
1257 /* Presence of _PRW indicates wake capable */
1258 status = acpi_get_handle(device->handle, "_PRW", &temp);
1259 if (ACPI_FAILURE(status))
1260 return;
1261
1262 err = acpi_bus_extract_wakeup_device_power_package(device->handle,
1263 &device->wakeup);
1264 if (err) {
1265 dev_err(&device->dev, "_PRW evaluation error: %d\n", err);
1266 return;
1267 }
1268
1269 device->wakeup.flags.valid = 1;
1270 device->wakeup.prepare_count = 0;
1271 acpi_bus_set_run_wake_flags(device);
1272 /* Call _PSW/_DSW object to disable its ability to wake the sleeping
1273 * system for the ACPI device with the _PRW object.
1274 * The _PSW object is depreciated in ACPI 3.0 and is replaced by _DSW.
1275 * So it is necessary to call _DSW object first. Only when it is not
1276 * present will the _PSW object used.
1277 */
1278 err = acpi_device_sleep_wake(device, 0, 0, 0);
1279 if (err)
1280 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
1281 "error in _DSW or _PSW evaluation\n"));
1282 }
1283
1284 static void acpi_bus_init_power_state(struct acpi_device *device, int state)
1285 {
1286 struct acpi_device_power_state *ps = &device->power.states[state];
1287 char pathname[5] = { '_', 'P', 'R', '0' + state, '\0' };
1288 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
1289 acpi_handle handle;
1290 acpi_status status;
1291
1292 INIT_LIST_HEAD(&ps->resources);
1293
1294 /* Evaluate "_PRx" to get referenced power resources */
1295 status = acpi_evaluate_object(device->handle, pathname, NULL, &buffer);
1296 if (ACPI_SUCCESS(status)) {
1297 union acpi_object *package = buffer.pointer;
1298
1299 if (buffer.length && package
1300 && package->type == ACPI_TYPE_PACKAGE
1301 && package->package.count) {
1302 int err = acpi_extract_power_resources(package, 0,
1303 &ps->resources);
1304 if (!err)
1305 device->power.flags.power_resources = 1;
1306 }
1307 ACPI_FREE(buffer.pointer);
1308 }
1309
1310 /* Evaluate "_PSx" to see if we can do explicit sets */
1311 pathname[2] = 'S';
1312 status = acpi_get_handle(device->handle, pathname, &handle);
1313 if (ACPI_SUCCESS(status))
1314 ps->flags.explicit_set = 1;
1315
1316 /*
1317 * State is valid if there are means to put the device into it.
1318 * D3hot is only valid if _PR3 present.
1319 */
1320 if (!list_empty(&ps->resources)
1321 || (ps->flags.explicit_set && state < ACPI_STATE_D3_HOT)) {
1322 ps->flags.valid = 1;
1323 ps->flags.os_accessible = 1;
1324 }
1325
1326 ps->power = -1; /* Unknown - driver assigned */
1327 ps->latency = -1; /* Unknown - driver assigned */
1328 }
1329
1330 static void acpi_bus_get_power_flags(struct acpi_device *device)
1331 {
1332 acpi_status status;
1333 acpi_handle handle;
1334 u32 i;
1335
1336 /* Presence of _PS0|_PR0 indicates 'power manageable' */
1337 status = acpi_get_handle(device->handle, "_PS0", &handle);
1338 if (ACPI_FAILURE(status)) {
1339 status = acpi_get_handle(device->handle, "_PR0", &handle);
1340 if (ACPI_FAILURE(status))
1341 return;
1342 }
1343
1344 device->flags.power_manageable = 1;
1345
1346 /*
1347 * Power Management Flags
1348 */
1349 status = acpi_get_handle(device->handle, "_PSC", &handle);
1350 if (ACPI_SUCCESS(status))
1351 device->power.flags.explicit_get = 1;
1352 status = acpi_get_handle(device->handle, "_IRC", &handle);
1353 if (ACPI_SUCCESS(status))
1354 device->power.flags.inrush_current = 1;
1355
1356 /*
1357 * Enumerate supported power management states
1358 */
1359 for (i = ACPI_STATE_D0; i <= ACPI_STATE_D3_HOT; i++)
1360 acpi_bus_init_power_state(device, i);
1361
1362 INIT_LIST_HEAD(&device->power.states[ACPI_STATE_D3_COLD].resources);
1363
1364 /* Set defaults for D0 and D3 states (always valid) */
1365 device->power.states[ACPI_STATE_D0].flags.valid = 1;
1366 device->power.states[ACPI_STATE_D0].power = 100;
1367 device->power.states[ACPI_STATE_D3].flags.valid = 1;
1368 device->power.states[ACPI_STATE_D3].power = 0;
1369
1370 /* Set D3cold's explicit_set flag if _PS3 exists. */
1371 if (device->power.states[ACPI_STATE_D3_HOT].flags.explicit_set)
1372 device->power.states[ACPI_STATE_D3_COLD].flags.explicit_set = 1;
1373
1374 /* Presence of _PS3 or _PRx means we can put the device into D3 cold */
1375 if (device->power.states[ACPI_STATE_D3_HOT].flags.explicit_set ||
1376 device->power.flags.power_resources)
1377 device->power.states[ACPI_STATE_D3_COLD].flags.os_accessible = 1;
1378
1379 if (acpi_bus_init_power(device)) {
1380 acpi_free_power_resources_lists(device);
1381 device->flags.power_manageable = 0;
1382 }
1383 }
1384
1385 static void acpi_bus_get_flags(struct acpi_device *device)
1386 {
1387 acpi_status status = AE_OK;
1388 acpi_handle temp = NULL;
1389
1390 /* Presence of _STA indicates 'dynamic_status' */
1391 status = acpi_get_handle(device->handle, "_STA", &temp);
1392 if (ACPI_SUCCESS(status))
1393 device->flags.dynamic_status = 1;
1394
1395 /* Presence of _RMV indicates 'removable' */
1396 status = acpi_get_handle(device->handle, "_RMV", &temp);
1397 if (ACPI_SUCCESS(status))
1398 device->flags.removable = 1;
1399
1400 /* Presence of _EJD|_EJ0 indicates 'ejectable' */
1401 status = acpi_get_handle(device->handle, "_EJD", &temp);
1402 if (ACPI_SUCCESS(status))
1403 device->flags.ejectable = 1;
1404 else {
1405 status = acpi_get_handle(device->handle, "_EJ0", &temp);
1406 if (ACPI_SUCCESS(status))
1407 device->flags.ejectable = 1;
1408 }
1409 }
1410
1411 static void acpi_device_get_busid(struct acpi_device *device)
1412 {
1413 char bus_id[5] = { '?', 0 };
1414 struct acpi_buffer buffer = { sizeof(bus_id), bus_id };
1415 int i = 0;
1416
1417 /*
1418 * Bus ID
1419 * ------
1420 * The device's Bus ID is simply the object name.
1421 * TBD: Shouldn't this value be unique (within the ACPI namespace)?
1422 */
1423 if (ACPI_IS_ROOT_DEVICE(device)) {
1424 strcpy(device->pnp.bus_id, "ACPI");
1425 return;
1426 }
1427
1428 switch (device->device_type) {
1429 case ACPI_BUS_TYPE_POWER_BUTTON:
1430 strcpy(device->pnp.bus_id, "PWRF");
1431 break;
1432 case ACPI_BUS_TYPE_SLEEP_BUTTON:
1433 strcpy(device->pnp.bus_id, "SLPF");
1434 break;
1435 default:
1436 acpi_get_name(device->handle, ACPI_SINGLE_NAME, &buffer);
1437 /* Clean up trailing underscores (if any) */
1438 for (i = 3; i > 1; i--) {
1439 if (bus_id[i] == '_')
1440 bus_id[i] = '\0';
1441 else
1442 break;
1443 }
1444 strcpy(device->pnp.bus_id, bus_id);
1445 break;
1446 }
1447 }
1448
1449 /*
1450 * acpi_bay_match - see if an acpi object is an ejectable driver bay
1451 *
1452 * If an acpi object is ejectable and has one of the ACPI ATA methods defined,
1453 * then we can safely call it an ejectable drive bay
1454 */
1455 static int acpi_bay_match(acpi_handle handle)
1456 {
1457 acpi_status status;
1458 acpi_handle tmp;
1459 acpi_handle phandle;
1460
1461 status = acpi_get_handle(handle, "_EJ0", &tmp);
1462 if (ACPI_FAILURE(status))
1463 return -ENODEV;
1464
1465 if ((ACPI_SUCCESS(acpi_get_handle(handle, "_GTF", &tmp))) ||
1466 (ACPI_SUCCESS(acpi_get_handle(handle, "_GTM", &tmp))) ||
1467 (ACPI_SUCCESS(acpi_get_handle(handle, "_STM", &tmp))) ||
1468 (ACPI_SUCCESS(acpi_get_handle(handle, "_SDD", &tmp))))
1469 return 0;
1470
1471 if (acpi_get_parent(handle, &phandle))
1472 return -ENODEV;
1473
1474 if ((ACPI_SUCCESS(acpi_get_handle(phandle, "_GTF", &tmp))) ||
1475 (ACPI_SUCCESS(acpi_get_handle(phandle, "_GTM", &tmp))) ||
1476 (ACPI_SUCCESS(acpi_get_handle(phandle, "_STM", &tmp))) ||
1477 (ACPI_SUCCESS(acpi_get_handle(phandle, "_SDD", &tmp))))
1478 return 0;
1479
1480 return -ENODEV;
1481 }
1482
1483 /*
1484 * acpi_dock_match - see if an acpi object has a _DCK method
1485 */
1486 static int acpi_dock_match(acpi_handle handle)
1487 {
1488 acpi_handle tmp;
1489 return acpi_get_handle(handle, "_DCK", &tmp);
1490 }
1491
1492 const char *acpi_device_hid(struct acpi_device *device)
1493 {
1494 struct acpi_hardware_id *hid;
1495
1496 if (list_empty(&device->pnp.ids))
1497 return dummy_hid;
1498
1499 hid = list_first_entry(&device->pnp.ids, struct acpi_hardware_id, list);
1500 return hid->id;
1501 }
1502 EXPORT_SYMBOL(acpi_device_hid);
1503
1504 static void acpi_add_id(struct acpi_device_pnp *pnp, const char *dev_id)
1505 {
1506 struct acpi_hardware_id *id;
1507
1508 id = kmalloc(sizeof(*id), GFP_KERNEL);
1509 if (!id)
1510 return;
1511
1512 id->id = kstrdup(dev_id, GFP_KERNEL);
1513 if (!id->id) {
1514 kfree(id);
1515 return;
1516 }
1517
1518 list_add_tail(&id->list, &pnp->ids);
1519 pnp->type.hardware_id = 1;
1520 }
1521
1522 /*
1523 * Old IBM workstations have a DSDT bug wherein the SMBus object
1524 * lacks the SMBUS01 HID and the methods do not have the necessary "_"
1525 * prefix. Work around this.
1526 */
1527 static int acpi_ibm_smbus_match(acpi_handle handle)
1528 {
1529 acpi_handle h_dummy;
1530 struct acpi_buffer path = {ACPI_ALLOCATE_BUFFER, NULL};
1531 int result;
1532
1533 if (!dmi_name_in_vendors("IBM"))
1534 return -ENODEV;
1535
1536 /* Look for SMBS object */
1537 result = acpi_get_name(handle, ACPI_SINGLE_NAME, &path);
1538 if (result)
1539 return result;
1540
1541 if (strcmp("SMBS", path.pointer)) {
1542 result = -ENODEV;
1543 goto out;
1544 }
1545
1546 /* Does it have the necessary (but misnamed) methods? */
1547 result = -ENODEV;
1548 if (ACPI_SUCCESS(acpi_get_handle(handle, "SBI", &h_dummy)) &&
1549 ACPI_SUCCESS(acpi_get_handle(handle, "SBR", &h_dummy)) &&
1550 ACPI_SUCCESS(acpi_get_handle(handle, "SBW", &h_dummy)))
1551 result = 0;
1552 out:
1553 kfree(path.pointer);
1554 return result;
1555 }
1556
1557 static void acpi_set_pnp_ids(acpi_handle handle, struct acpi_device_pnp *pnp,
1558 int device_type)
1559 {
1560 acpi_status status;
1561 struct acpi_device_info *info;
1562 struct acpi_pnp_device_id_list *cid_list;
1563 int i;
1564
1565 switch (device_type) {
1566 case ACPI_BUS_TYPE_DEVICE:
1567 if (handle == ACPI_ROOT_OBJECT) {
1568 acpi_add_id(pnp, ACPI_SYSTEM_HID);
1569 break;
1570 }
1571
1572 status = acpi_get_object_info(handle, &info);
1573 if (ACPI_FAILURE(status)) {
1574 pr_err(PREFIX "%s: Error reading device info\n",
1575 __func__);
1576 return;
1577 }
1578
1579 if (info->valid & ACPI_VALID_HID)
1580 acpi_add_id(pnp, info->hardware_id.string);
1581 if (info->valid & ACPI_VALID_CID) {
1582 cid_list = &info->compatible_id_list;
1583 for (i = 0; i < cid_list->count; i++)
1584 acpi_add_id(pnp, cid_list->ids[i].string);
1585 }
1586 if (info->valid & ACPI_VALID_ADR) {
1587 pnp->bus_address = info->address;
1588 pnp->type.bus_address = 1;
1589 }
1590 if (info->valid & ACPI_VALID_UID)
1591 pnp->unique_id = kstrdup(info->unique_id.string,
1592 GFP_KERNEL);
1593
1594 kfree(info);
1595
1596 /*
1597 * Some devices don't reliably have _HIDs & _CIDs, so add
1598 * synthetic HIDs to make sure drivers can find them.
1599 */
1600 if (acpi_is_video_device(handle))
1601 acpi_add_id(pnp, ACPI_VIDEO_HID);
1602 else if (ACPI_SUCCESS(acpi_bay_match(handle)))
1603 acpi_add_id(pnp, ACPI_BAY_HID);
1604 else if (ACPI_SUCCESS(acpi_dock_match(handle)))
1605 acpi_add_id(pnp, ACPI_DOCK_HID);
1606 else if (!acpi_ibm_smbus_match(handle))
1607 acpi_add_id(pnp, ACPI_SMBUS_IBM_HID);
1608 else if (list_empty(&pnp->ids) && handle == ACPI_ROOT_OBJECT) {
1609 acpi_add_id(pnp, ACPI_BUS_HID); /* \_SB, LNXSYBUS */
1610 strcpy(pnp->device_name, ACPI_BUS_DEVICE_NAME);
1611 strcpy(pnp->device_class, ACPI_BUS_CLASS);
1612 }
1613
1614 break;
1615 case ACPI_BUS_TYPE_POWER:
1616 acpi_add_id(pnp, ACPI_POWER_HID);
1617 break;
1618 case ACPI_BUS_TYPE_PROCESSOR:
1619 acpi_add_id(pnp, ACPI_PROCESSOR_OBJECT_HID);
1620 break;
1621 case ACPI_BUS_TYPE_THERMAL:
1622 acpi_add_id(pnp, ACPI_THERMAL_HID);
1623 break;
1624 case ACPI_BUS_TYPE_POWER_BUTTON:
1625 acpi_add_id(pnp, ACPI_BUTTON_HID_POWERF);
1626 break;
1627 case ACPI_BUS_TYPE_SLEEP_BUTTON:
1628 acpi_add_id(pnp, ACPI_BUTTON_HID_SLEEPF);
1629 break;
1630 }
1631 }
1632
1633 void acpi_free_pnp_ids(struct acpi_device_pnp *pnp)
1634 {
1635 struct acpi_hardware_id *id, *tmp;
1636
1637 list_for_each_entry_safe(id, tmp, &pnp->ids, list) {
1638 kfree(id->id);
1639 kfree(id);
1640 }
1641 kfree(pnp->unique_id);
1642 }
1643
1644 void acpi_init_device_object(struct acpi_device *device, acpi_handle handle,
1645 int type, unsigned long long sta)
1646 {
1647 INIT_LIST_HEAD(&device->pnp.ids);
1648 device->device_type = type;
1649 device->handle = handle;
1650 device->parent = acpi_bus_get_parent(handle);
1651 STRUCT_TO_INT(device->status) = sta;
1652 acpi_device_get_busid(device);
1653 acpi_set_pnp_ids(handle, &device->pnp, type);
1654 acpi_bus_get_flags(device);
1655 device->flags.match_driver = false;
1656 device_initialize(&device->dev);
1657 dev_set_uevent_suppress(&device->dev, true);
1658 }
1659
1660 void acpi_device_add_finalize(struct acpi_device *device)
1661 {
1662 device->flags.match_driver = true;
1663 dev_set_uevent_suppress(&device->dev, false);
1664 kobject_uevent(&device->dev.kobj, KOBJ_ADD);
1665 }
1666
1667 static int acpi_add_single_object(struct acpi_device **child,
1668 acpi_handle handle, int type,
1669 unsigned long long sta)
1670 {
1671 int result;
1672 struct acpi_device *device;
1673 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
1674
1675 device = kzalloc(sizeof(struct acpi_device), GFP_KERNEL);
1676 if (!device) {
1677 printk(KERN_ERR PREFIX "Memory allocation error\n");
1678 return -ENOMEM;
1679 }
1680
1681 acpi_init_device_object(device, handle, type, sta);
1682 acpi_bus_get_power_flags(device);
1683 acpi_bus_get_wakeup_device_flags(device);
1684
1685 result = acpi_device_add(device, acpi_device_release);
1686 if (result) {
1687 acpi_device_release(&device->dev);
1688 return result;
1689 }
1690
1691 acpi_power_add_remove_device(device, true);
1692 acpi_device_add_finalize(device);
1693 acpi_get_name(handle, ACPI_FULL_PATHNAME, &buffer);
1694 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Added %s [%s] parent %s\n",
1695 dev_name(&device->dev), (char *) buffer.pointer,
1696 device->parent ? dev_name(&device->parent->dev) : "(null)"));
1697 kfree(buffer.pointer);
1698 *child = device;
1699 return 0;
1700 }
1701
1702 static int acpi_bus_type_and_status(acpi_handle handle, int *type,
1703 unsigned long long *sta)
1704 {
1705 acpi_status status;
1706 acpi_object_type acpi_type;
1707
1708 status = acpi_get_type(handle, &acpi_type);
1709 if (ACPI_FAILURE(status))
1710 return -ENODEV;
1711
1712 switch (acpi_type) {
1713 case ACPI_TYPE_ANY: /* for ACPI_ROOT_OBJECT */
1714 case ACPI_TYPE_DEVICE:
1715 *type = ACPI_BUS_TYPE_DEVICE;
1716 status = acpi_bus_get_status_handle(handle, sta);
1717 if (ACPI_FAILURE(status))
1718 return -ENODEV;
1719 break;
1720 case ACPI_TYPE_PROCESSOR:
1721 *type = ACPI_BUS_TYPE_PROCESSOR;
1722 status = acpi_bus_get_status_handle(handle, sta);
1723 if (ACPI_FAILURE(status))
1724 return -ENODEV;
1725 break;
1726 case ACPI_TYPE_THERMAL:
1727 *type = ACPI_BUS_TYPE_THERMAL;
1728 *sta = ACPI_STA_DEFAULT;
1729 break;
1730 case ACPI_TYPE_POWER:
1731 *type = ACPI_BUS_TYPE_POWER;
1732 *sta = ACPI_STA_DEFAULT;
1733 break;
1734 default:
1735 return -ENODEV;
1736 }
1737
1738 return 0;
1739 }
1740
1741 static bool acpi_scan_handler_matching(struct acpi_scan_handler *handler,
1742 char *idstr,
1743 const struct acpi_device_id **matchid)
1744 {
1745 const struct acpi_device_id *devid;
1746
1747 for (devid = handler->ids; devid->id[0]; devid++)
1748 if (!strcmp((char *)devid->id, idstr)) {
1749 if (matchid)
1750 *matchid = devid;
1751
1752 return true;
1753 }
1754
1755 return false;
1756 }
1757
1758 static struct acpi_scan_handler *acpi_scan_match_handler(char *idstr,
1759 const struct acpi_device_id **matchid)
1760 {
1761 struct acpi_scan_handler *handler;
1762
1763 list_for_each_entry(handler, &acpi_scan_handlers_list, list_node)
1764 if (acpi_scan_handler_matching(handler, idstr, matchid))
1765 return handler;
1766
1767 return NULL;
1768 }
1769
1770 void acpi_scan_hotplug_enabled(struct acpi_hotplug_profile *hotplug, bool val)
1771 {
1772 if (!!hotplug->enabled == !!val)
1773 return;
1774
1775 mutex_lock(&acpi_scan_lock);
1776
1777 hotplug->enabled = val;
1778
1779 mutex_unlock(&acpi_scan_lock);
1780 }
1781
1782 static void acpi_scan_init_hotplug(acpi_handle handle, int type)
1783 {
1784 struct acpi_device_pnp pnp = {};
1785 struct acpi_hardware_id *hwid;
1786 struct acpi_scan_handler *handler;
1787
1788 INIT_LIST_HEAD(&pnp.ids);
1789 acpi_set_pnp_ids(handle, &pnp, type);
1790
1791 if (!pnp.type.hardware_id)
1792 goto out;
1793
1794 /*
1795 * This relies on the fact that acpi_install_notify_handler() will not
1796 * install the same notify handler routine twice for the same handle.
1797 */
1798 list_for_each_entry(hwid, &pnp.ids, list) {
1799 handler = acpi_scan_match_handler(hwid->id, NULL);
1800 if (handler) {
1801 acpi_install_notify_handler(handle, ACPI_SYSTEM_NOTIFY,
1802 acpi_hotplug_notify_cb, handler);
1803 break;
1804 }
1805 }
1806
1807 out:
1808 acpi_free_pnp_ids(&pnp);
1809 }
1810
1811 static acpi_status acpi_bus_check_add(acpi_handle handle, u32 lvl_not_used,
1812 void *not_used, void **return_value)
1813 {
1814 struct acpi_device *device = NULL;
1815 int type;
1816 unsigned long long sta;
1817 acpi_status status;
1818 int result;
1819
1820 acpi_bus_get_device(handle, &device);
1821 if (device)
1822 goto out;
1823
1824 result = acpi_bus_type_and_status(handle, &type, &sta);
1825 if (result)
1826 return AE_OK;
1827
1828 if (type == ACPI_BUS_TYPE_POWER) {
1829 acpi_add_power_resource(handle);
1830 return AE_OK;
1831 }
1832
1833 acpi_scan_init_hotplug(handle, type);
1834
1835 if (!(sta & ACPI_STA_DEVICE_PRESENT) &&
1836 !(sta & ACPI_STA_DEVICE_FUNCTIONING)) {
1837 struct acpi_device_wakeup wakeup;
1838 acpi_handle temp;
1839
1840 status = acpi_get_handle(handle, "_PRW", &temp);
1841 if (ACPI_SUCCESS(status)) {
1842 acpi_bus_extract_wakeup_device_power_package(handle,
1843 &wakeup);
1844 acpi_power_resources_list_free(&wakeup.resources);
1845 }
1846 return AE_CTRL_DEPTH;
1847 }
1848
1849 acpi_add_single_object(&device, handle, type, sta);
1850 if (!device)
1851 return AE_CTRL_DEPTH;
1852
1853 out:
1854 if (!*return_value)
1855 *return_value = device;
1856
1857 return AE_OK;
1858 }
1859
1860 static int acpi_scan_attach_handler(struct acpi_device *device)
1861 {
1862 struct acpi_hardware_id *hwid;
1863 int ret = 0;
1864
1865 list_for_each_entry(hwid, &device->pnp.ids, list) {
1866 const struct acpi_device_id *devid;
1867 struct acpi_scan_handler *handler;
1868
1869 handler = acpi_scan_match_handler(hwid->id, &devid);
1870 if (handler) {
1871 ret = handler->attach(device, devid);
1872 if (ret > 0) {
1873 device->handler = handler;
1874 break;
1875 } else if (ret < 0) {
1876 break;
1877 }
1878 }
1879 }
1880 return ret;
1881 }
1882
1883 static acpi_status acpi_bus_device_attach(acpi_handle handle, u32 lvl_not_used,
1884 void *not_used, void **ret_not_used)
1885 {
1886 struct acpi_device *device;
1887 unsigned long long sta_not_used;
1888 int ret;
1889
1890 /*
1891 * Ignore errors ignored by acpi_bus_check_add() to avoid terminating
1892 * namespace walks prematurely.
1893 */
1894 if (acpi_bus_type_and_status(handle, &ret, &sta_not_used))
1895 return AE_OK;
1896
1897 if (acpi_bus_get_device(handle, &device))
1898 return AE_CTRL_DEPTH;
1899
1900 ret = acpi_scan_attach_handler(device);
1901 if (ret)
1902 return ret > 0 ? AE_OK : AE_CTRL_DEPTH;
1903
1904 ret = device_attach(&device->dev);
1905 return ret >= 0 ? AE_OK : AE_CTRL_DEPTH;
1906 }
1907
1908 /**
1909 * acpi_bus_scan - Add ACPI device node objects in a given namespace scope.
1910 * @handle: Root of the namespace scope to scan.
1911 *
1912 * Scan a given ACPI tree (probably recently hot-plugged) and create and add
1913 * found devices.
1914 *
1915 * If no devices were found, -ENODEV is returned, but it does not mean that
1916 * there has been a real error. There just have been no suitable ACPI objects
1917 * in the table trunk from which the kernel could create a device and add an
1918 * appropriate driver.
1919 *
1920 * Must be called under acpi_scan_lock.
1921 */
1922 int acpi_bus_scan(acpi_handle handle)
1923 {
1924 void *device = NULL;
1925 int error = 0;
1926
1927 if (ACPI_SUCCESS(acpi_bus_check_add(handle, 0, NULL, &device)))
1928 acpi_walk_namespace(ACPI_TYPE_ANY, handle, ACPI_UINT32_MAX,
1929 acpi_bus_check_add, NULL, NULL, &device);
1930
1931 if (!device)
1932 error = -ENODEV;
1933 else if (ACPI_SUCCESS(acpi_bus_device_attach(handle, 0, NULL, NULL)))
1934 acpi_walk_namespace(ACPI_TYPE_ANY, handle, ACPI_UINT32_MAX,
1935 acpi_bus_device_attach, NULL, NULL, NULL);
1936
1937 return error;
1938 }
1939 EXPORT_SYMBOL(acpi_bus_scan);
1940
1941 static acpi_status acpi_bus_device_detach(acpi_handle handle, u32 lvl_not_used,
1942 void *not_used, void **ret_not_used)
1943 {
1944 struct acpi_device *device = NULL;
1945
1946 if (!acpi_bus_get_device(handle, &device)) {
1947 struct acpi_scan_handler *dev_handler = device->handler;
1948
1949 device->removal_type = ACPI_BUS_REMOVAL_EJECT;
1950 if (dev_handler) {
1951 if (dev_handler->detach)
1952 dev_handler->detach(device);
1953
1954 device->handler = NULL;
1955 } else {
1956 device_release_driver(&device->dev);
1957 }
1958 }
1959 return AE_OK;
1960 }
1961
1962 static acpi_status acpi_bus_remove(acpi_handle handle, u32 lvl_not_used,
1963 void *not_used, void **ret_not_used)
1964 {
1965 struct acpi_device *device = NULL;
1966
1967 if (!acpi_bus_get_device(handle, &device))
1968 acpi_device_unregister(device);
1969
1970 return AE_OK;
1971 }
1972
1973 /**
1974 * acpi_bus_trim - Remove ACPI device node and all of its descendants
1975 * @start: Root of the ACPI device nodes subtree to remove.
1976 *
1977 * Must be called under acpi_scan_lock.
1978 */
1979 void acpi_bus_trim(struct acpi_device *start)
1980 {
1981 /*
1982 * Execute acpi_bus_device_detach() as a post-order callback to detach
1983 * all ACPI drivers from the device nodes being removed.
1984 */
1985 acpi_walk_namespace(ACPI_TYPE_ANY, start->handle, ACPI_UINT32_MAX, NULL,
1986 acpi_bus_device_detach, NULL, NULL);
1987 acpi_bus_device_detach(start->handle, 0, NULL, NULL);
1988 /*
1989 * Execute acpi_bus_remove() as a post-order callback to remove device
1990 * nodes in the given namespace scope.
1991 */
1992 acpi_walk_namespace(ACPI_TYPE_ANY, start->handle, ACPI_UINT32_MAX, NULL,
1993 acpi_bus_remove, NULL, NULL);
1994 acpi_bus_remove(start->handle, 0, NULL, NULL);
1995 }
1996 EXPORT_SYMBOL_GPL(acpi_bus_trim);
1997
1998 static int acpi_bus_scan_fixed(void)
1999 {
2000 int result = 0;
2001
2002 /*
2003 * Enumerate all fixed-feature devices.
2004 */
2005 if (!(acpi_gbl_FADT.flags & ACPI_FADT_POWER_BUTTON)) {
2006 struct acpi_device *device = NULL;
2007
2008 result = acpi_add_single_object(&device, NULL,
2009 ACPI_BUS_TYPE_POWER_BUTTON,
2010 ACPI_STA_DEFAULT);
2011 if (result)
2012 return result;
2013
2014 result = device_attach(&device->dev);
2015 if (result < 0)
2016 return result;
2017
2018 device_init_wakeup(&device->dev, true);
2019 }
2020
2021 if (!(acpi_gbl_FADT.flags & ACPI_FADT_SLEEP_BUTTON)) {
2022 struct acpi_device *device = NULL;
2023
2024 result = acpi_add_single_object(&device, NULL,
2025 ACPI_BUS_TYPE_SLEEP_BUTTON,
2026 ACPI_STA_DEFAULT);
2027 if (result)
2028 return result;
2029
2030 result = device_attach(&device->dev);
2031 }
2032
2033 return result < 0 ? result : 0;
2034 }
2035
2036 int __init acpi_scan_init(void)
2037 {
2038 int result;
2039
2040 result = bus_register(&acpi_bus_type);
2041 if (result) {
2042 /* We don't want to quit even if we failed to add suspend/resume */
2043 printk(KERN_ERR PREFIX "Could not register bus type\n");
2044 }
2045
2046 acpi_pci_root_init();
2047 acpi_pci_link_init();
2048 acpi_platform_init();
2049 acpi_lpss_init();
2050 acpi_container_init();
2051 acpi_memory_hotplug_init();
2052
2053 mutex_lock(&acpi_scan_lock);
2054 /*
2055 * Enumerate devices in the ACPI namespace.
2056 */
2057 result = acpi_bus_scan(ACPI_ROOT_OBJECT);
2058 if (result)
2059 goto out;
2060
2061 result = acpi_bus_get_device(ACPI_ROOT_OBJECT, &acpi_root);
2062 if (result)
2063 goto out;
2064
2065 result = acpi_bus_scan_fixed();
2066 if (result) {
2067 acpi_device_unregister(acpi_root);
2068 goto out;
2069 }
2070
2071 acpi_update_all_gpes();
2072
2073 acpi_pci_root_hp_init();
2074
2075 out:
2076 mutex_unlock(&acpi_scan_lock);
2077 return result;
2078 }
kernel source for telekom puls (alcatel/mediatek)