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[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/kernel.h>
8 #include <linux/acpi.h>
9 #include <linux/signal.h>
10 #include <linux/kthread.h>
11
12 #include <acpi/acpi_drivers.h>
13
14 #include "internal.h"
15
16 #define _COMPONENT ACPI_BUS_COMPONENT
17 ACPI_MODULE_NAME("scan");
18 #define STRUCT_TO_INT(s) (*((int*)&s))
19 extern struct acpi_device *acpi_root;
20
21 #define ACPI_BUS_CLASS "system_bus"
22 #define ACPI_BUS_HID "LNXSYBUS"
23 #define ACPI_BUS_DEVICE_NAME "System Bus"
24
25 #define ACPI_IS_ROOT_DEVICE(device) (!(device)->parent)
26
27 static LIST_HEAD(acpi_device_list);
28 static LIST_HEAD(acpi_bus_id_list);
29 DEFINE_MUTEX(acpi_device_lock);
30 LIST_HEAD(acpi_wakeup_device_list);
31
32 struct acpi_device_bus_id{
33 char bus_id[15];
34 unsigned int instance_no;
35 struct list_head node;
36 };
37
38 /*
39 * Creates hid/cid(s) string needed for modalias and uevent
40 * e.g. on a device with hid:IBM0001 and cid:ACPI0001 you get:
41 * char *modalias: "acpi:IBM0001:ACPI0001"
42 */
43 static int create_modalias(struct acpi_device *acpi_dev, char *modalias,
44 int size)
45 {
46 int len;
47 int count;
48 struct acpi_hardware_id *id;
49
50 len = snprintf(modalias, size, "acpi:");
51 size -= len;
52
53 list_for_each_entry(id, &acpi_dev->pnp.ids, list) {
54 count = snprintf(&modalias[len], size, "%s:", id->id);
55 if (count < 0 || count >= size)
56 return -EINVAL;
57 len += count;
58 size -= count;
59 }
60
61 modalias[len] = '\0';
62 return len;
63 }
64
65 static ssize_t
66 acpi_device_modalias_show(struct device *dev, struct device_attribute *attr, char *buf) {
67 struct acpi_device *acpi_dev = to_acpi_device(dev);
68 int len;
69
70 /* Device has no HID and no CID or string is >1024 */
71 len = create_modalias(acpi_dev, buf, 1024);
72 if (len <= 0)
73 return 0;
74 buf[len++] = '\n';
75 return len;
76 }
77 static DEVICE_ATTR(modalias, 0444, acpi_device_modalias_show, NULL);
78
79 static void acpi_bus_hot_remove_device(void *context)
80 {
81 struct acpi_device *device;
82 acpi_handle handle = context;
83 struct acpi_object_list arg_list;
84 union acpi_object arg;
85 acpi_status status = AE_OK;
86
87 if (acpi_bus_get_device(handle, &device))
88 return;
89
90 if (!device)
91 return;
92
93 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
94 "Hot-removing device %s...\n", dev_name(&device->dev)));
95
96 if (acpi_bus_trim(device, 1)) {
97 printk(KERN_ERR PREFIX
98 "Removing device failed\n");
99 return;
100 }
101
102 /* power off device */
103 status = acpi_evaluate_object(handle, "_PS3", NULL, NULL);
104 if (ACPI_FAILURE(status) && status != AE_NOT_FOUND)
105 printk(KERN_WARNING PREFIX
106 "Power-off device failed\n");
107
108 if (device->flags.lockable) {
109 arg_list.count = 1;
110 arg_list.pointer = &arg;
111 arg.type = ACPI_TYPE_INTEGER;
112 arg.integer.value = 0;
113 acpi_evaluate_object(handle, "_LCK", &arg_list, NULL);
114 }
115
116 arg_list.count = 1;
117 arg_list.pointer = &arg;
118 arg.type = ACPI_TYPE_INTEGER;
119 arg.integer.value = 1;
120
121 /*
122 * TBD: _EJD support.
123 */
124 status = acpi_evaluate_object(handle, "_EJ0", &arg_list, NULL);
125 if (ACPI_FAILURE(status))
126 printk(KERN_WARNING PREFIX
127 "Eject device failed\n");
128
129 return;
130 }
131
132 static ssize_t
133 acpi_eject_store(struct device *d, struct device_attribute *attr,
134 const char *buf, size_t count)
135 {
136 int ret = count;
137 acpi_status status;
138 acpi_object_type type = 0;
139 struct acpi_device *acpi_device = to_acpi_device(d);
140
141 if ((!count) || (buf[0] != '1')) {
142 return -EINVAL;
143 }
144 #ifndef FORCE_EJECT
145 if (acpi_device->driver == NULL) {
146 ret = -ENODEV;
147 goto err;
148 }
149 #endif
150 status = acpi_get_type(acpi_device->handle, &type);
151 if (ACPI_FAILURE(status) || (!acpi_device->flags.ejectable)) {
152 ret = -ENODEV;
153 goto err;
154 }
155
156 acpi_os_hotplug_execute(acpi_bus_hot_remove_device, acpi_device->handle);
157 err:
158 return ret;
159 }
160
161 static DEVICE_ATTR(eject, 0200, NULL, acpi_eject_store);
162
163 static ssize_t
164 acpi_device_hid_show(struct device *dev, struct device_attribute *attr, char *buf) {
165 struct acpi_device *acpi_dev = to_acpi_device(dev);
166
167 return sprintf(buf, "%s\n", acpi_device_hid(acpi_dev));
168 }
169 static DEVICE_ATTR(hid, 0444, acpi_device_hid_show, NULL);
170
171 static ssize_t
172 acpi_device_path_show(struct device *dev, struct device_attribute *attr, char *buf) {
173 struct acpi_device *acpi_dev = to_acpi_device(dev);
174 struct acpi_buffer path = {ACPI_ALLOCATE_BUFFER, NULL};
175 int result;
176
177 result = acpi_get_name(acpi_dev->handle, ACPI_FULL_PATHNAME, &path);
178 if (result)
179 goto end;
180
181 result = sprintf(buf, "%s\n", (char*)path.pointer);
182 kfree(path.pointer);
183 end:
184 return result;
185 }
186 static DEVICE_ATTR(path, 0444, acpi_device_path_show, NULL);
187
188 static int acpi_device_setup_files(struct acpi_device *dev)
189 {
190 acpi_status status;
191 acpi_handle temp;
192 int result = 0;
193
194 /*
195 * Devices gotten from FADT don't have a "path" attribute
196 */
197 if (dev->handle) {
198 result = device_create_file(&dev->dev, &dev_attr_path);
199 if (result)
200 goto end;
201 }
202
203 result = device_create_file(&dev->dev, &dev_attr_hid);
204 if (result)
205 goto end;
206
207 result = device_create_file(&dev->dev, &dev_attr_modalias);
208 if (result)
209 goto end;
210
211 /*
212 * If device has _EJ0, 'eject' file is created that is used to trigger
213 * hot-removal function from userland.
214 */
215 status = acpi_get_handle(dev->handle, "_EJ0", &temp);
216 if (ACPI_SUCCESS(status))
217 result = device_create_file(&dev->dev, &dev_attr_eject);
218 end:
219 return result;
220 }
221
222 static void acpi_device_remove_files(struct acpi_device *dev)
223 {
224 acpi_status status;
225 acpi_handle temp;
226
227 /*
228 * If device has _EJ0, 'eject' file is created that is used to trigger
229 * hot-removal function from userland.
230 */
231 status = acpi_get_handle(dev->handle, "_EJ0", &temp);
232 if (ACPI_SUCCESS(status))
233 device_remove_file(&dev->dev, &dev_attr_eject);
234
235 device_remove_file(&dev->dev, &dev_attr_modalias);
236 device_remove_file(&dev->dev, &dev_attr_hid);
237 if (dev->handle)
238 device_remove_file(&dev->dev, &dev_attr_path);
239 }
240 /* --------------------------------------------------------------------------
241 ACPI Bus operations
242 -------------------------------------------------------------------------- */
243
244 int acpi_match_device_ids(struct acpi_device *device,
245 const struct acpi_device_id *ids)
246 {
247 const struct acpi_device_id *id;
248 struct acpi_hardware_id *hwid;
249
250 /*
251 * If the device is not present, it is unnecessary to load device
252 * driver for it.
253 */
254 if (!device->status.present)
255 return -ENODEV;
256
257 for (id = ids; id->id[0]; id++)
258 list_for_each_entry(hwid, &device->pnp.ids, list)
259 if (!strcmp((char *) id->id, hwid->id))
260 return 0;
261
262 return -ENOENT;
263 }
264 EXPORT_SYMBOL(acpi_match_device_ids);
265
266 static void acpi_free_ids(struct acpi_device *device)
267 {
268 struct acpi_hardware_id *id, *tmp;
269
270 list_for_each_entry_safe(id, tmp, &device->pnp.ids, list) {
271 kfree(id->id);
272 kfree(id);
273 }
274 }
275
276 static void acpi_device_release(struct device *dev)
277 {
278 struct acpi_device *acpi_dev = to_acpi_device(dev);
279
280 acpi_free_ids(acpi_dev);
281 kfree(acpi_dev);
282 }
283
284 static int acpi_device_suspend(struct device *dev, pm_message_t state)
285 {
286 struct acpi_device *acpi_dev = to_acpi_device(dev);
287 struct acpi_driver *acpi_drv = acpi_dev->driver;
288
289 if (acpi_drv && acpi_drv->ops.suspend)
290 return acpi_drv->ops.suspend(acpi_dev, state);
291 return 0;
292 }
293
294 static int acpi_device_resume(struct device *dev)
295 {
296 struct acpi_device *acpi_dev = to_acpi_device(dev);
297 struct acpi_driver *acpi_drv = acpi_dev->driver;
298
299 if (acpi_drv && acpi_drv->ops.resume)
300 return acpi_drv->ops.resume(acpi_dev);
301 return 0;
302 }
303
304 static int acpi_bus_match(struct device *dev, struct device_driver *drv)
305 {
306 struct acpi_device *acpi_dev = to_acpi_device(dev);
307 struct acpi_driver *acpi_drv = to_acpi_driver(drv);
308
309 return !acpi_match_device_ids(acpi_dev, acpi_drv->ids);
310 }
311
312 static int acpi_device_uevent(struct device *dev, struct kobj_uevent_env *env)
313 {
314 struct acpi_device *acpi_dev = to_acpi_device(dev);
315 int len;
316
317 if (add_uevent_var(env, "MODALIAS="))
318 return -ENOMEM;
319 len = create_modalias(acpi_dev, &env->buf[env->buflen - 1],
320 sizeof(env->buf) - env->buflen);
321 if (len >= (sizeof(env->buf) - env->buflen))
322 return -ENOMEM;
323 env->buflen += len;
324 return 0;
325 }
326
327 static void acpi_device_notify(acpi_handle handle, u32 event, void *data)
328 {
329 struct acpi_device *device = data;
330
331 device->driver->ops.notify(device, event);
332 }
333
334 static acpi_status acpi_device_notify_fixed(void *data)
335 {
336 struct acpi_device *device = data;
337
338 /* Fixed hardware devices have no handles */
339 acpi_device_notify(NULL, ACPI_FIXED_HARDWARE_EVENT, device);
340 return AE_OK;
341 }
342
343 static int acpi_device_install_notify_handler(struct acpi_device *device)
344 {
345 acpi_status status;
346
347 if (device->device_type == ACPI_BUS_TYPE_POWER_BUTTON)
348 status =
349 acpi_install_fixed_event_handler(ACPI_EVENT_POWER_BUTTON,
350 acpi_device_notify_fixed,
351 device);
352 else if (device->device_type == ACPI_BUS_TYPE_SLEEP_BUTTON)
353 status =
354 acpi_install_fixed_event_handler(ACPI_EVENT_SLEEP_BUTTON,
355 acpi_device_notify_fixed,
356 device);
357 else
358 status = acpi_install_notify_handler(device->handle,
359 ACPI_DEVICE_NOTIFY,
360 acpi_device_notify,
361 device);
362
363 if (ACPI_FAILURE(status))
364 return -EINVAL;
365 return 0;
366 }
367
368 static void acpi_device_remove_notify_handler(struct acpi_device *device)
369 {
370 if (device->device_type == ACPI_BUS_TYPE_POWER_BUTTON)
371 acpi_remove_fixed_event_handler(ACPI_EVENT_POWER_BUTTON,
372 acpi_device_notify_fixed);
373 else if (device->device_type == ACPI_BUS_TYPE_SLEEP_BUTTON)
374 acpi_remove_fixed_event_handler(ACPI_EVENT_SLEEP_BUTTON,
375 acpi_device_notify_fixed);
376 else
377 acpi_remove_notify_handler(device->handle, ACPI_DEVICE_NOTIFY,
378 acpi_device_notify);
379 }
380
381 static int acpi_bus_driver_init(struct acpi_device *, struct acpi_driver *);
382 static int acpi_start_single_object(struct acpi_device *);
383 static int acpi_device_probe(struct device * dev)
384 {
385 struct acpi_device *acpi_dev = to_acpi_device(dev);
386 struct acpi_driver *acpi_drv = to_acpi_driver(dev->driver);
387 int ret;
388
389 ret = acpi_bus_driver_init(acpi_dev, acpi_drv);
390 if (!ret) {
391 if (acpi_dev->bus_ops.acpi_op_start)
392 acpi_start_single_object(acpi_dev);
393
394 if (acpi_drv->ops.notify) {
395 ret = acpi_device_install_notify_handler(acpi_dev);
396 if (ret) {
397 if (acpi_drv->ops.remove)
398 acpi_drv->ops.remove(acpi_dev,
399 acpi_dev->removal_type);
400 return ret;
401 }
402 }
403
404 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
405 "Found driver [%s] for device [%s]\n",
406 acpi_drv->name, acpi_dev->pnp.bus_id));
407 get_device(dev);
408 }
409 return ret;
410 }
411
412 static int acpi_device_remove(struct device * dev)
413 {
414 struct acpi_device *acpi_dev = to_acpi_device(dev);
415 struct acpi_driver *acpi_drv = acpi_dev->driver;
416
417 if (acpi_drv) {
418 if (acpi_drv->ops.notify)
419 acpi_device_remove_notify_handler(acpi_dev);
420 if (acpi_drv->ops.remove)
421 acpi_drv->ops.remove(acpi_dev, acpi_dev->removal_type);
422 }
423 acpi_dev->driver = NULL;
424 acpi_dev->driver_data = NULL;
425
426 put_device(dev);
427 return 0;
428 }
429
430 struct bus_type acpi_bus_type = {
431 .name = "acpi",
432 .suspend = acpi_device_suspend,
433 .resume = acpi_device_resume,
434 .match = acpi_bus_match,
435 .probe = acpi_device_probe,
436 .remove = acpi_device_remove,
437 .uevent = acpi_device_uevent,
438 };
439
440 static int acpi_device_register(struct acpi_device *device)
441 {
442 int result;
443 struct acpi_device_bus_id *acpi_device_bus_id, *new_bus_id;
444 int found = 0;
445
446 /*
447 * Linkage
448 * -------
449 * Link this device to its parent and siblings.
450 */
451 INIT_LIST_HEAD(&device->children);
452 INIT_LIST_HEAD(&device->node);
453 INIT_LIST_HEAD(&device->wakeup_list);
454
455 new_bus_id = kzalloc(sizeof(struct acpi_device_bus_id), GFP_KERNEL);
456 if (!new_bus_id) {
457 printk(KERN_ERR PREFIX "Memory allocation error\n");
458 return -ENOMEM;
459 }
460
461 mutex_lock(&acpi_device_lock);
462 /*
463 * Find suitable bus_id and instance number in acpi_bus_id_list
464 * If failed, create one and link it into acpi_bus_id_list
465 */
466 list_for_each_entry(acpi_device_bus_id, &acpi_bus_id_list, node) {
467 if (!strcmp(acpi_device_bus_id->bus_id,
468 acpi_device_hid(device))) {
469 acpi_device_bus_id->instance_no++;
470 found = 1;
471 kfree(new_bus_id);
472 break;
473 }
474 }
475 if (!found) {
476 acpi_device_bus_id = new_bus_id;
477 strcpy(acpi_device_bus_id->bus_id, acpi_device_hid(device));
478 acpi_device_bus_id->instance_no = 0;
479 list_add_tail(&acpi_device_bus_id->node, &acpi_bus_id_list);
480 }
481 dev_set_name(&device->dev, "%s:%02x", acpi_device_bus_id->bus_id, acpi_device_bus_id->instance_no);
482
483 if (device->parent)
484 list_add_tail(&device->node, &device->parent->children);
485
486 if (device->wakeup.flags.valid)
487 list_add_tail(&device->wakeup_list, &acpi_wakeup_device_list);
488 mutex_unlock(&acpi_device_lock);
489
490 if (device->parent)
491 device->dev.parent = &device->parent->dev;
492 device->dev.bus = &acpi_bus_type;
493 device->dev.release = &acpi_device_release;
494 result = device_register(&device->dev);
495 if (result) {
496 dev_err(&device->dev, "Error registering device\n");
497 goto end;
498 }
499
500 result = acpi_device_setup_files(device);
501 if (result)
502 printk(KERN_ERR PREFIX "Error creating sysfs interface for device %s\n",
503 dev_name(&device->dev));
504
505 device->removal_type = ACPI_BUS_REMOVAL_NORMAL;
506 return 0;
507 end:
508 mutex_lock(&acpi_device_lock);
509 if (device->parent)
510 list_del(&device->node);
511 list_del(&device->wakeup_list);
512 mutex_unlock(&acpi_device_lock);
513 return result;
514 }
515
516 static void acpi_device_unregister(struct acpi_device *device, int type)
517 {
518 mutex_lock(&acpi_device_lock);
519 if (device->parent)
520 list_del(&device->node);
521
522 list_del(&device->wakeup_list);
523 mutex_unlock(&acpi_device_lock);
524
525 acpi_detach_data(device->handle, acpi_bus_data_handler);
526
527 acpi_device_remove_files(device);
528 device_unregister(&device->dev);
529 }
530
531 /* --------------------------------------------------------------------------
532 Driver Management
533 -------------------------------------------------------------------------- */
534 /**
535 * acpi_bus_driver_init - add a device to a driver
536 * @device: the device to add and initialize
537 * @driver: driver for the device
538 *
539 * Used to initialize a device via its device driver. Called whenever a
540 * driver is bound to a device. Invokes the driver's add() ops.
541 */
542 static int
543 acpi_bus_driver_init(struct acpi_device *device, struct acpi_driver *driver)
544 {
545 int result = 0;
546
547 if (!device || !driver)
548 return -EINVAL;
549
550 if (!driver->ops.add)
551 return -ENOSYS;
552
553 result = driver->ops.add(device);
554 if (result) {
555 device->driver = NULL;
556 device->driver_data = NULL;
557 return result;
558 }
559
560 device->driver = driver;
561
562 /*
563 * TBD - Configuration Management: Assign resources to device based
564 * upon possible configuration and currently allocated resources.
565 */
566
567 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
568 "Driver successfully bound to device\n"));
569 return 0;
570 }
571
572 static int acpi_start_single_object(struct acpi_device *device)
573 {
574 int result = 0;
575 struct acpi_driver *driver;
576
577
578 if (!(driver = device->driver))
579 return 0;
580
581 if (driver->ops.start) {
582 result = driver->ops.start(device);
583 if (result && driver->ops.remove)
584 driver->ops.remove(device, ACPI_BUS_REMOVAL_NORMAL);
585 }
586
587 return result;
588 }
589
590 /**
591 * acpi_bus_register_driver - register a driver with the ACPI bus
592 * @driver: driver being registered
593 *
594 * Registers a driver with the ACPI bus. Searches the namespace for all
595 * devices that match the driver's criteria and binds. Returns zero for
596 * success or a negative error status for failure.
597 */
598 int acpi_bus_register_driver(struct acpi_driver *driver)
599 {
600 int ret;
601
602 if (acpi_disabled)
603 return -ENODEV;
604 driver->drv.name = driver->name;
605 driver->drv.bus = &acpi_bus_type;
606 driver->drv.owner = driver->owner;
607
608 ret = driver_register(&driver->drv);
609 return ret;
610 }
611
612 EXPORT_SYMBOL(acpi_bus_register_driver);
613
614 /**
615 * acpi_bus_unregister_driver - unregisters a driver with the APIC bus
616 * @driver: driver to unregister
617 *
618 * Unregisters a driver with the ACPI bus. Searches the namespace for all
619 * devices that match the driver's criteria and unbinds.
620 */
621 void acpi_bus_unregister_driver(struct acpi_driver *driver)
622 {
623 driver_unregister(&driver->drv);
624 }
625
626 EXPORT_SYMBOL(acpi_bus_unregister_driver);
627
628 /* --------------------------------------------------------------------------
629 Device Enumeration
630 -------------------------------------------------------------------------- */
631 static struct acpi_device *acpi_bus_get_parent(acpi_handle handle)
632 {
633 acpi_status status;
634 int ret;
635 struct acpi_device *device;
636
637 /*
638 * Fixed hardware devices do not appear in the namespace and do not
639 * have handles, but we fabricate acpi_devices for them, so we have
640 * to deal with them specially.
641 */
642 if (handle == NULL)
643 return acpi_root;
644
645 do {
646 status = acpi_get_parent(handle, &handle);
647 if (status == AE_NULL_ENTRY)
648 return NULL;
649 if (ACPI_FAILURE(status))
650 return acpi_root;
651
652 ret = acpi_bus_get_device(handle, &device);
653 if (ret == 0)
654 return device;
655 } while (1);
656 }
657
658 acpi_status
659 acpi_bus_get_ejd(acpi_handle handle, acpi_handle *ejd)
660 {
661 acpi_status status;
662 acpi_handle tmp;
663 struct acpi_buffer buffer = {ACPI_ALLOCATE_BUFFER, NULL};
664 union acpi_object *obj;
665
666 status = acpi_get_handle(handle, "_EJD", &tmp);
667 if (ACPI_FAILURE(status))
668 return status;
669
670 status = acpi_evaluate_object(handle, "_EJD", NULL, &buffer);
671 if (ACPI_SUCCESS(status)) {
672 obj = buffer.pointer;
673 status = acpi_get_handle(ACPI_ROOT_OBJECT, obj->string.pointer,
674 ejd);
675 kfree(buffer.pointer);
676 }
677 return status;
678 }
679 EXPORT_SYMBOL_GPL(acpi_bus_get_ejd);
680
681 void acpi_bus_data_handler(acpi_handle handle, void *context)
682 {
683
684 /* TBD */
685
686 return;
687 }
688
689 static int acpi_bus_get_perf_flags(struct acpi_device *device)
690 {
691 device->performance.state = ACPI_STATE_UNKNOWN;
692 return 0;
693 }
694
695 static acpi_status
696 acpi_bus_extract_wakeup_device_power_package(struct acpi_device *device,
697 union acpi_object *package)
698 {
699 int i = 0;
700 union acpi_object *element = NULL;
701
702 if (!device || !package || (package->package.count < 2))
703 return AE_BAD_PARAMETER;
704
705 element = &(package->package.elements[0]);
706 if (!element)
707 return AE_BAD_PARAMETER;
708 if (element->type == ACPI_TYPE_PACKAGE) {
709 if ((element->package.count < 2) ||
710 (element->package.elements[0].type !=
711 ACPI_TYPE_LOCAL_REFERENCE)
712 || (element->package.elements[1].type != ACPI_TYPE_INTEGER))
713 return AE_BAD_DATA;
714 device->wakeup.gpe_device =
715 element->package.elements[0].reference.handle;
716 device->wakeup.gpe_number =
717 (u32) element->package.elements[1].integer.value;
718 } else if (element->type == ACPI_TYPE_INTEGER) {
719 device->wakeup.gpe_number = element->integer.value;
720 } else
721 return AE_BAD_DATA;
722
723 element = &(package->package.elements[1]);
724 if (element->type != ACPI_TYPE_INTEGER) {
725 return AE_BAD_DATA;
726 }
727 device->wakeup.sleep_state = element->integer.value;
728
729 if ((package->package.count - 2) > ACPI_MAX_HANDLES) {
730 return AE_NO_MEMORY;
731 }
732 device->wakeup.resources.count = package->package.count - 2;
733 for (i = 0; i < device->wakeup.resources.count; i++) {
734 element = &(package->package.elements[i + 2]);
735 if (element->type != ACPI_TYPE_LOCAL_REFERENCE)
736 return AE_BAD_DATA;
737
738 device->wakeup.resources.handles[i] = element->reference.handle;
739 }
740
741 return AE_OK;
742 }
743
744 static void acpi_bus_set_run_wake_flags(struct acpi_device *device)
745 {
746 struct acpi_device_id button_device_ids[] = {
747 {"PNP0C0D", 0},
748 {"PNP0C0C", 0},
749 {"PNP0C0E", 0},
750 {"", 0},
751 };
752 acpi_status status;
753 acpi_event_status event_status;
754
755 device->wakeup.run_wake_count = 0;
756 device->wakeup.flags.notifier_present = 0;
757
758 /* Power button, Lid switch always enable wakeup */
759 if (!acpi_match_device_ids(device, button_device_ids)) {
760 device->wakeup.flags.run_wake = 1;
761 device->wakeup.flags.always_enabled = 1;
762 return;
763 }
764
765 status = acpi_get_gpe_status(NULL, device->wakeup.gpe_number,
766 ACPI_NOT_ISR, &event_status);
767 if (status == AE_OK)
768 device->wakeup.flags.run_wake =
769 !!(event_status & ACPI_EVENT_FLAG_HANDLE);
770 }
771
772 static int acpi_bus_get_wakeup_device_flags(struct acpi_device *device)
773 {
774 acpi_status status = 0;
775 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
776 union acpi_object *package = NULL;
777 int psw_error;
778
779 /* _PRW */
780 status = acpi_evaluate_object(device->handle, "_PRW", NULL, &buffer);
781 if (ACPI_FAILURE(status)) {
782 ACPI_EXCEPTION((AE_INFO, status, "Evaluating _PRW"));
783 goto end;
784 }
785
786 package = (union acpi_object *)buffer.pointer;
787 status = acpi_bus_extract_wakeup_device_power_package(device, package);
788 if (ACPI_FAILURE(status)) {
789 ACPI_EXCEPTION((AE_INFO, status, "Extracting _PRW package"));
790 goto end;
791 }
792
793 kfree(buffer.pointer);
794
795 device->wakeup.flags.valid = 1;
796 device->wakeup.prepare_count = 0;
797 acpi_bus_set_run_wake_flags(device);
798 /* Call _PSW/_DSW object to disable its ability to wake the sleeping
799 * system for the ACPI device with the _PRW object.
800 * The _PSW object is depreciated in ACPI 3.0 and is replaced by _DSW.
801 * So it is necessary to call _DSW object first. Only when it is not
802 * present will the _PSW object used.
803 */
804 psw_error = acpi_device_sleep_wake(device, 0, 0, 0);
805 if (psw_error)
806 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
807 "error in _DSW or _PSW evaluation\n"));
808
809 end:
810 if (ACPI_FAILURE(status))
811 device->flags.wake_capable = 0;
812 return 0;
813 }
814
815 static int acpi_bus_get_power_flags(struct acpi_device *device)
816 {
817 acpi_status status = 0;
818 acpi_handle handle = NULL;
819 u32 i = 0;
820
821
822 /*
823 * Power Management Flags
824 */
825 status = acpi_get_handle(device->handle, "_PSC", &handle);
826 if (ACPI_SUCCESS(status))
827 device->power.flags.explicit_get = 1;
828 status = acpi_get_handle(device->handle, "_IRC", &handle);
829 if (ACPI_SUCCESS(status))
830 device->power.flags.inrush_current = 1;
831
832 /*
833 * Enumerate supported power management states
834 */
835 for (i = ACPI_STATE_D0; i <= ACPI_STATE_D3; i++) {
836 struct acpi_device_power_state *ps = &device->power.states[i];
837 char object_name[5] = { '_', 'P', 'R', '0' + i, '\0' };
838
839 /* Evaluate "_PRx" to se if power resources are referenced */
840 acpi_evaluate_reference(device->handle, object_name, NULL,
841 &ps->resources);
842 if (ps->resources.count) {
843 device->power.flags.power_resources = 1;
844 ps->flags.valid = 1;
845 }
846
847 /* Evaluate "_PSx" to see if we can do explicit sets */
848 object_name[2] = 'S';
849 status = acpi_get_handle(device->handle, object_name, &handle);
850 if (ACPI_SUCCESS(status)) {
851 ps->flags.explicit_set = 1;
852 ps->flags.valid = 1;
853 }
854
855 /* State is valid if we have some power control */
856 if (ps->resources.count || ps->flags.explicit_set)
857 ps->flags.valid = 1;
858
859 ps->power = -1; /* Unknown - driver assigned */
860 ps->latency = -1; /* Unknown - driver assigned */
861 }
862
863 /* Set defaults for D0 and D3 states (always valid) */
864 device->power.states[ACPI_STATE_D0].flags.valid = 1;
865 device->power.states[ACPI_STATE_D0].power = 100;
866 device->power.states[ACPI_STATE_D3].flags.valid = 1;
867 device->power.states[ACPI_STATE_D3].power = 0;
868
869 /* TBD: System wake support and resource requirements. */
870
871 device->power.state = ACPI_STATE_UNKNOWN;
872 acpi_bus_get_power(device->handle, &(device->power.state));
873
874 return 0;
875 }
876
877 static int acpi_bus_get_flags(struct acpi_device *device)
878 {
879 acpi_status status = AE_OK;
880 acpi_handle temp = NULL;
881
882
883 /* Presence of _STA indicates 'dynamic_status' */
884 status = acpi_get_handle(device->handle, "_STA", &temp);
885 if (ACPI_SUCCESS(status))
886 device->flags.dynamic_status = 1;
887
888 /* Presence of _RMV indicates 'removable' */
889 status = acpi_get_handle(device->handle, "_RMV", &temp);
890 if (ACPI_SUCCESS(status))
891 device->flags.removable = 1;
892
893 /* Presence of _EJD|_EJ0 indicates 'ejectable' */
894 status = acpi_get_handle(device->handle, "_EJD", &temp);
895 if (ACPI_SUCCESS(status))
896 device->flags.ejectable = 1;
897 else {
898 status = acpi_get_handle(device->handle, "_EJ0", &temp);
899 if (ACPI_SUCCESS(status))
900 device->flags.ejectable = 1;
901 }
902
903 /* Presence of _LCK indicates 'lockable' */
904 status = acpi_get_handle(device->handle, "_LCK", &temp);
905 if (ACPI_SUCCESS(status))
906 device->flags.lockable = 1;
907
908 /* Presence of _PS0|_PR0 indicates 'power manageable' */
909 status = acpi_get_handle(device->handle, "_PS0", &temp);
910 if (ACPI_FAILURE(status))
911 status = acpi_get_handle(device->handle, "_PR0", &temp);
912 if (ACPI_SUCCESS(status))
913 device->flags.power_manageable = 1;
914
915 /* Presence of _PRW indicates wake capable */
916 status = acpi_get_handle(device->handle, "_PRW", &temp);
917 if (ACPI_SUCCESS(status))
918 device->flags.wake_capable = 1;
919
920 /* TBD: Performance management */
921
922 return 0;
923 }
924
925 static void acpi_device_get_busid(struct acpi_device *device)
926 {
927 char bus_id[5] = { '?', 0 };
928 struct acpi_buffer buffer = { sizeof(bus_id), bus_id };
929 int i = 0;
930
931 /*
932 * Bus ID
933 * ------
934 * The device's Bus ID is simply the object name.
935 * TBD: Shouldn't this value be unique (within the ACPI namespace)?
936 */
937 if (ACPI_IS_ROOT_DEVICE(device)) {
938 strcpy(device->pnp.bus_id, "ACPI");
939 return;
940 }
941
942 switch (device->device_type) {
943 case ACPI_BUS_TYPE_POWER_BUTTON:
944 strcpy(device->pnp.bus_id, "PWRF");
945 break;
946 case ACPI_BUS_TYPE_SLEEP_BUTTON:
947 strcpy(device->pnp.bus_id, "SLPF");
948 break;
949 default:
950 acpi_get_name(device->handle, ACPI_SINGLE_NAME, &buffer);
951 /* Clean up trailing underscores (if any) */
952 for (i = 3; i > 1; i--) {
953 if (bus_id[i] == '_')
954 bus_id[i] = '\0';
955 else
956 break;
957 }
958 strcpy(device->pnp.bus_id, bus_id);
959 break;
960 }
961 }
962
963 /*
964 * acpi_bay_match - see if a device is an ejectable driver bay
965 *
966 * If an acpi object is ejectable and has one of the ACPI ATA methods defined,
967 * then we can safely call it an ejectable drive bay
968 */
969 static int acpi_bay_match(struct acpi_device *device){
970 acpi_status status;
971 acpi_handle handle;
972 acpi_handle tmp;
973 acpi_handle phandle;
974
975 handle = device->handle;
976
977 status = acpi_get_handle(handle, "_EJ0", &tmp);
978 if (ACPI_FAILURE(status))
979 return -ENODEV;
980
981 if ((ACPI_SUCCESS(acpi_get_handle(handle, "_GTF", &tmp))) ||
982 (ACPI_SUCCESS(acpi_get_handle(handle, "_GTM", &tmp))) ||
983 (ACPI_SUCCESS(acpi_get_handle(handle, "_STM", &tmp))) ||
984 (ACPI_SUCCESS(acpi_get_handle(handle, "_SDD", &tmp))))
985 return 0;
986
987 if (acpi_get_parent(handle, &phandle))
988 return -ENODEV;
989
990 if ((ACPI_SUCCESS(acpi_get_handle(phandle, "_GTF", &tmp))) ||
991 (ACPI_SUCCESS(acpi_get_handle(phandle, "_GTM", &tmp))) ||
992 (ACPI_SUCCESS(acpi_get_handle(phandle, "_STM", &tmp))) ||
993 (ACPI_SUCCESS(acpi_get_handle(phandle, "_SDD", &tmp))))
994 return 0;
995
996 return -ENODEV;
997 }
998
999 /*
1000 * acpi_dock_match - see if a device has a _DCK method
1001 */
1002 static int acpi_dock_match(struct acpi_device *device)
1003 {
1004 acpi_handle tmp;
1005 return acpi_get_handle(device->handle, "_DCK", &tmp);
1006 }
1007
1008 char *acpi_device_hid(struct acpi_device *device)
1009 {
1010 struct acpi_hardware_id *hid;
1011
1012 hid = list_first_entry(&device->pnp.ids, struct acpi_hardware_id, list);
1013 return hid->id;
1014 }
1015 EXPORT_SYMBOL(acpi_device_hid);
1016
1017 static void acpi_add_id(struct acpi_device *device, const char *dev_id)
1018 {
1019 struct acpi_hardware_id *id;
1020
1021 id = kmalloc(sizeof(*id), GFP_KERNEL);
1022 if (!id)
1023 return;
1024
1025 id->id = kmalloc(strlen(dev_id) + 1, GFP_KERNEL);
1026 if (!id->id) {
1027 kfree(id);
1028 return;
1029 }
1030
1031 strcpy(id->id, dev_id);
1032 list_add_tail(&id->list, &device->pnp.ids);
1033 }
1034
1035 static void acpi_device_set_id(struct acpi_device *device)
1036 {
1037 acpi_status status;
1038 struct acpi_device_info *info;
1039 struct acpica_device_id_list *cid_list;
1040 int i;
1041
1042 switch (device->device_type) {
1043 case ACPI_BUS_TYPE_DEVICE:
1044 if (ACPI_IS_ROOT_DEVICE(device)) {
1045 acpi_add_id(device, ACPI_SYSTEM_HID);
1046 break;
1047 } else if (ACPI_IS_ROOT_DEVICE(device->parent)) {
1048 /* \_SB_, the only root-level namespace device */
1049 acpi_add_id(device, ACPI_BUS_HID);
1050 strcpy(device->pnp.device_name, ACPI_BUS_DEVICE_NAME);
1051 strcpy(device->pnp.device_class, ACPI_BUS_CLASS);
1052 break;
1053 }
1054
1055 status = acpi_get_object_info(device->handle, &info);
1056 if (ACPI_FAILURE(status)) {
1057 printk(KERN_ERR PREFIX "%s: Error reading device info\n", __func__);
1058 return;
1059 }
1060
1061 if (info->valid & ACPI_VALID_HID)
1062 acpi_add_id(device, info->hardware_id.string);
1063 if (info->valid & ACPI_VALID_CID) {
1064 cid_list = &info->compatible_id_list;
1065 for (i = 0; i < cid_list->count; i++)
1066 acpi_add_id(device, cid_list->ids[i].string);
1067 }
1068 if (info->valid & ACPI_VALID_ADR) {
1069 device->pnp.bus_address = info->address;
1070 device->flags.bus_address = 1;
1071 }
1072
1073 kfree(info);
1074
1075 /*
1076 * Some devices don't reliably have _HIDs & _CIDs, so add
1077 * synthetic HIDs to make sure drivers can find them.
1078 */
1079 if (acpi_is_video_device(device))
1080 acpi_add_id(device, ACPI_VIDEO_HID);
1081 else if (ACPI_SUCCESS(acpi_bay_match(device)))
1082 acpi_add_id(device, ACPI_BAY_HID);
1083 else if (ACPI_SUCCESS(acpi_dock_match(device)))
1084 acpi_add_id(device, ACPI_DOCK_HID);
1085
1086 break;
1087 case ACPI_BUS_TYPE_POWER:
1088 acpi_add_id(device, ACPI_POWER_HID);
1089 break;
1090 case ACPI_BUS_TYPE_PROCESSOR:
1091 acpi_add_id(device, ACPI_PROCESSOR_OBJECT_HID);
1092 break;
1093 case ACPI_BUS_TYPE_THERMAL:
1094 acpi_add_id(device, ACPI_THERMAL_HID);
1095 break;
1096 case ACPI_BUS_TYPE_POWER_BUTTON:
1097 acpi_add_id(device, ACPI_BUTTON_HID_POWERF);
1098 break;
1099 case ACPI_BUS_TYPE_SLEEP_BUTTON:
1100 acpi_add_id(device, ACPI_BUTTON_HID_SLEEPF);
1101 break;
1102 }
1103
1104 /*
1105 * We build acpi_devices for some objects that don't have _HID or _CID,
1106 * e.g., PCI bridges and slots. Drivers can't bind to these objects,
1107 * but we do use them indirectly by traversing the acpi_device tree.
1108 * This generic ID isn't useful for driver binding, but it provides
1109 * the useful property that "every acpi_device has an ID."
1110 */
1111 if (list_empty(&device->pnp.ids))
1112 acpi_add_id(device, "device");
1113 }
1114
1115 static int acpi_device_set_context(struct acpi_device *device)
1116 {
1117 acpi_status status;
1118
1119 /*
1120 * Context
1121 * -------
1122 * Attach this 'struct acpi_device' to the ACPI object. This makes
1123 * resolutions from handle->device very efficient. Fixed hardware
1124 * devices have no handles, so we skip them.
1125 */
1126 if (!device->handle)
1127 return 0;
1128
1129 status = acpi_attach_data(device->handle,
1130 acpi_bus_data_handler, device);
1131 if (ACPI_SUCCESS(status))
1132 return 0;
1133
1134 printk(KERN_ERR PREFIX "Error attaching device data\n");
1135 return -ENODEV;
1136 }
1137
1138 static int acpi_bus_remove(struct acpi_device *dev, int rmdevice)
1139 {
1140 if (!dev)
1141 return -EINVAL;
1142
1143 dev->removal_type = ACPI_BUS_REMOVAL_EJECT;
1144 device_release_driver(&dev->dev);
1145
1146 if (!rmdevice)
1147 return 0;
1148
1149 /*
1150 * unbind _ADR-Based Devices when hot removal
1151 */
1152 if (dev->flags.bus_address) {
1153 if ((dev->parent) && (dev->parent->ops.unbind))
1154 dev->parent->ops.unbind(dev);
1155 }
1156 acpi_device_unregister(dev, ACPI_BUS_REMOVAL_EJECT);
1157
1158 return 0;
1159 }
1160
1161 static int acpi_add_single_object(struct acpi_device **child,
1162 acpi_handle handle, int type,
1163 unsigned long long sta,
1164 struct acpi_bus_ops *ops)
1165 {
1166 int result;
1167 struct acpi_device *device;
1168 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
1169
1170 device = kzalloc(sizeof(struct acpi_device), GFP_KERNEL);
1171 if (!device) {
1172 printk(KERN_ERR PREFIX "Memory allocation error\n");
1173 return -ENOMEM;
1174 }
1175
1176 INIT_LIST_HEAD(&device->pnp.ids);
1177 device->device_type = type;
1178 device->handle = handle;
1179 device->parent = acpi_bus_get_parent(handle);
1180 device->bus_ops = *ops; /* workround for not call .start */
1181 STRUCT_TO_INT(device->status) = sta;
1182
1183 acpi_device_get_busid(device);
1184
1185 /*
1186 * Flags
1187 * -----
1188 * Note that we only look for object handles -- cannot evaluate objects
1189 * until we know the device is present and properly initialized.
1190 */
1191 result = acpi_bus_get_flags(device);
1192 if (result)
1193 goto end;
1194
1195 /*
1196 * Initialize Device
1197 * -----------------
1198 * TBD: Synch with Core's enumeration/initialization process.
1199 */
1200 acpi_device_set_id(device);
1201
1202 /*
1203 * Power Management
1204 * ----------------
1205 */
1206 if (device->flags.power_manageable) {
1207 result = acpi_bus_get_power_flags(device);
1208 if (result)
1209 goto end;
1210 }
1211
1212 /*
1213 * Wakeup device management
1214 *-----------------------
1215 */
1216 if (device->flags.wake_capable) {
1217 result = acpi_bus_get_wakeup_device_flags(device);
1218 if (result)
1219 goto end;
1220 }
1221
1222 /*
1223 * Performance Management
1224 * ----------------------
1225 */
1226 if (device->flags.performance_manageable) {
1227 result = acpi_bus_get_perf_flags(device);
1228 if (result)
1229 goto end;
1230 }
1231
1232 if ((result = acpi_device_set_context(device)))
1233 goto end;
1234
1235 result = acpi_device_register(device);
1236
1237 /*
1238 * Bind _ADR-Based Devices when hot add
1239 */
1240 if (device->flags.bus_address) {
1241 if (device->parent && device->parent->ops.bind)
1242 device->parent->ops.bind(device);
1243 }
1244
1245 end:
1246 if (!result) {
1247 acpi_get_name(handle, ACPI_FULL_PATHNAME, &buffer);
1248 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
1249 "Adding %s [%s] parent %s\n", dev_name(&device->dev),
1250 (char *) buffer.pointer,
1251 device->parent ? dev_name(&device->parent->dev) :
1252 "(null)"));
1253 kfree(buffer.pointer);
1254 *child = device;
1255 } else
1256 acpi_device_release(&device->dev);
1257
1258 return result;
1259 }
1260
1261 #define ACPI_STA_DEFAULT (ACPI_STA_DEVICE_PRESENT | ACPI_STA_DEVICE_ENABLED | \
1262 ACPI_STA_DEVICE_UI | ACPI_STA_DEVICE_FUNCTIONING)
1263
1264 static int acpi_bus_type_and_status(acpi_handle handle, int *type,
1265 unsigned long long *sta)
1266 {
1267 acpi_status status;
1268 acpi_object_type acpi_type;
1269
1270 status = acpi_get_type(handle, &acpi_type);
1271 if (ACPI_FAILURE(status))
1272 return -ENODEV;
1273
1274 switch (acpi_type) {
1275 case ACPI_TYPE_ANY: /* for ACPI_ROOT_OBJECT */
1276 case ACPI_TYPE_DEVICE:
1277 *type = ACPI_BUS_TYPE_DEVICE;
1278 status = acpi_bus_get_status_handle(handle, sta);
1279 if (ACPI_FAILURE(status))
1280 return -ENODEV;
1281 break;
1282 case ACPI_TYPE_PROCESSOR:
1283 *type = ACPI_BUS_TYPE_PROCESSOR;
1284 status = acpi_bus_get_status_handle(handle, sta);
1285 if (ACPI_FAILURE(status))
1286 return -ENODEV;
1287 break;
1288 case ACPI_TYPE_THERMAL:
1289 *type = ACPI_BUS_TYPE_THERMAL;
1290 *sta = ACPI_STA_DEFAULT;
1291 break;
1292 case ACPI_TYPE_POWER:
1293 *type = ACPI_BUS_TYPE_POWER;
1294 *sta = ACPI_STA_DEFAULT;
1295 break;
1296 default:
1297 return -ENODEV;
1298 }
1299
1300 return 0;
1301 }
1302
1303 static acpi_status acpi_bus_check_add(acpi_handle handle, u32 lvl,
1304 void *context, void **return_value)
1305 {
1306 struct acpi_bus_ops *ops = context;
1307 int type;
1308 unsigned long long sta;
1309 struct acpi_device *device;
1310 acpi_status status;
1311 int result;
1312
1313 result = acpi_bus_type_and_status(handle, &type, &sta);
1314 if (result)
1315 return AE_OK;
1316
1317 if (!(sta & ACPI_STA_DEVICE_PRESENT) &&
1318 !(sta & ACPI_STA_DEVICE_FUNCTIONING))
1319 return AE_CTRL_DEPTH;
1320
1321 /*
1322 * We may already have an acpi_device from a previous enumeration. If
1323 * so, we needn't add it again, but we may still have to start it.
1324 */
1325 device = NULL;
1326 acpi_bus_get_device(handle, &device);
1327 if (ops->acpi_op_add && !device)
1328 acpi_add_single_object(&device, handle, type, sta, ops);
1329
1330 if (!device)
1331 return AE_CTRL_DEPTH;
1332
1333 if (ops->acpi_op_start && !(ops->acpi_op_add)) {
1334 status = acpi_start_single_object(device);
1335 if (ACPI_FAILURE(status))
1336 return AE_CTRL_DEPTH;
1337 }
1338
1339 if (!*return_value)
1340 *return_value = device;
1341 return AE_OK;
1342 }
1343
1344 static int acpi_bus_scan(acpi_handle handle, struct acpi_bus_ops *ops,
1345 struct acpi_device **child)
1346 {
1347 acpi_status status;
1348 void *device = NULL;
1349
1350 status = acpi_bus_check_add(handle, 0, ops, &device);
1351 if (ACPI_SUCCESS(status))
1352 acpi_walk_namespace(ACPI_TYPE_ANY, handle, ACPI_UINT32_MAX,
1353 acpi_bus_check_add, NULL, ops, &device);
1354
1355 if (child)
1356 *child = device;
1357
1358 if (device)
1359 return 0;
1360 else
1361 return -ENODEV;
1362 }
1363
1364 /*
1365 * acpi_bus_add and acpi_bus_start
1366 *
1367 * scan a given ACPI tree and (probably recently hot-plugged)
1368 * create and add or starts found devices.
1369 *
1370 * If no devices were found -ENODEV is returned which does not
1371 * mean that this is a real error, there just have been no suitable
1372 * ACPI objects in the table trunk from which the kernel could create
1373 * a device and add/start an appropriate driver.
1374 */
1375
1376 int
1377 acpi_bus_add(struct acpi_device **child,
1378 struct acpi_device *parent, acpi_handle handle, int type)
1379 {
1380 struct acpi_bus_ops ops;
1381
1382 memset(&ops, 0, sizeof(ops));
1383 ops.acpi_op_add = 1;
1384
1385 return acpi_bus_scan(handle, &ops, child);
1386 }
1387 EXPORT_SYMBOL(acpi_bus_add);
1388
1389 int acpi_bus_start(struct acpi_device *device)
1390 {
1391 struct acpi_bus_ops ops;
1392
1393 if (!device)
1394 return -EINVAL;
1395
1396 memset(&ops, 0, sizeof(ops));
1397 ops.acpi_op_start = 1;
1398
1399 return acpi_bus_scan(device->handle, &ops, NULL);
1400 }
1401 EXPORT_SYMBOL(acpi_bus_start);
1402
1403 int acpi_bus_trim(struct acpi_device *start, int rmdevice)
1404 {
1405 acpi_status status;
1406 struct acpi_device *parent, *child;
1407 acpi_handle phandle, chandle;
1408 acpi_object_type type;
1409 u32 level = 1;
1410 int err = 0;
1411
1412 parent = start;
1413 phandle = start->handle;
1414 child = chandle = NULL;
1415
1416 while ((level > 0) && parent && (!err)) {
1417 status = acpi_get_next_object(ACPI_TYPE_ANY, phandle,
1418 chandle, &chandle);
1419
1420 /*
1421 * If this scope is exhausted then move our way back up.
1422 */
1423 if (ACPI_FAILURE(status)) {
1424 level--;
1425 chandle = phandle;
1426 acpi_get_parent(phandle, &phandle);
1427 child = parent;
1428 parent = parent->parent;
1429
1430 if (level == 0)
1431 err = acpi_bus_remove(child, rmdevice);
1432 else
1433 err = acpi_bus_remove(child, 1);
1434
1435 continue;
1436 }
1437
1438 status = acpi_get_type(chandle, &type);
1439 if (ACPI_FAILURE(status)) {
1440 continue;
1441 }
1442 /*
1443 * If there is a device corresponding to chandle then
1444 * parse it (depth-first).
1445 */
1446 if (acpi_bus_get_device(chandle, &child) == 0) {
1447 level++;
1448 phandle = chandle;
1449 chandle = NULL;
1450 parent = child;
1451 }
1452 continue;
1453 }
1454 return err;
1455 }
1456 EXPORT_SYMBOL_GPL(acpi_bus_trim);
1457
1458 static int acpi_bus_scan_fixed(void)
1459 {
1460 int result = 0;
1461 struct acpi_device *device = NULL;
1462 struct acpi_bus_ops ops;
1463
1464 memset(&ops, 0, sizeof(ops));
1465 ops.acpi_op_add = 1;
1466 ops.acpi_op_start = 1;
1467
1468 /*
1469 * Enumerate all fixed-feature devices.
1470 */
1471 if ((acpi_gbl_FADT.flags & ACPI_FADT_POWER_BUTTON) == 0) {
1472 result = acpi_add_single_object(&device, NULL,
1473 ACPI_BUS_TYPE_POWER_BUTTON,
1474 ACPI_STA_DEFAULT,
1475 &ops);
1476 }
1477
1478 if ((acpi_gbl_FADT.flags & ACPI_FADT_SLEEP_BUTTON) == 0) {
1479 result = acpi_add_single_object(&device, NULL,
1480 ACPI_BUS_TYPE_SLEEP_BUTTON,
1481 ACPI_STA_DEFAULT,
1482 &ops);
1483 }
1484
1485 return result;
1486 }
1487
1488 int __init acpi_scan_init(void)
1489 {
1490 int result;
1491 struct acpi_bus_ops ops;
1492
1493 memset(&ops, 0, sizeof(ops));
1494 ops.acpi_op_add = 1;
1495 ops.acpi_op_start = 1;
1496
1497 result = bus_register(&acpi_bus_type);
1498 if (result) {
1499 /* We don't want to quit even if we failed to add suspend/resume */
1500 printk(KERN_ERR PREFIX "Could not register bus type\n");
1501 }
1502
1503 /*
1504 * Enumerate devices in the ACPI namespace.
1505 */
1506 result = acpi_bus_scan(ACPI_ROOT_OBJECT, &ops, &acpi_root);
1507
1508 if (!result)
1509 result = acpi_bus_scan_fixed();
1510
1511 if (result)
1512 acpi_device_unregister(acpi_root, ACPI_BUS_REMOVAL_NORMAL);
1513
1514 return result;
1515 }
kernel source for telekom puls (alcatel/mediatek)