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x86, ioapic: Fix non atomic allocation with interrupts disabled
[linux-2.6/linux-2.6-openrd.git] / drivers / acpi / scan.c
blobc54d7b6c406680b5b82d0df4e0aa9b1a0ac8688d
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 #define _COMPONENT ACPI_BUS_COMPONENT
15 ACPI_MODULE_NAME("scan");
16 #define STRUCT_TO_INT(s) (*((int*)&s))
17 extern struct acpi_device *acpi_root;
18
19 #define ACPI_BUS_CLASS "system_bus"
20 #define ACPI_BUS_HID "LNXSYBUS"
21 #define ACPI_BUS_DEVICE_NAME "System Bus"
22
23 static LIST_HEAD(acpi_device_list);
24 static LIST_HEAD(acpi_bus_id_list);
25 DEFINE_SPINLOCK(acpi_device_lock);
26 LIST_HEAD(acpi_wakeup_device_list);
27
28 struct acpi_device_bus_id{
29 char bus_id[15];
30 unsigned int instance_no;
31 struct list_head node;
32 };
33
34 /*
35 * Creates hid/cid(s) string needed for modalias and uevent
36 * e.g. on a device with hid:IBM0001 and cid:ACPI0001 you get:
37 * char *modalias: "acpi:IBM0001:ACPI0001"
38 */
39 static int create_modalias(struct acpi_device *acpi_dev, char *modalias,
40 int size)
41 {
42 int len;
43 int count;
44
45 if (!acpi_dev->flags.hardware_id && !acpi_dev->flags.compatible_ids)
46 return -ENODEV;
47
48 len = snprintf(modalias, size, "acpi:");
49 size -= len;
50
51 if (acpi_dev->flags.hardware_id) {
52 count = snprintf(&modalias[len], size, "%s:",
53 acpi_dev->pnp.hardware_id);
54 if (count < 0 || count >= size)
55 return -EINVAL;
56 len += count;
57 size -= count;
58 }
59
60 if (acpi_dev->flags.compatible_ids) {
61 struct acpi_compatible_id_list *cid_list;
62 int i;
63
64 cid_list = acpi_dev->pnp.cid_list;
65 for (i = 0; i < cid_list->count; i++) {
66 count = snprintf(&modalias[len], size, "%s:",
67 cid_list->id[i].value);
68 if (count < 0 || count >= size) {
69 printk(KERN_ERR PREFIX "%s cid[%i] exceeds event buffer size",
70 acpi_dev->pnp.device_name, i);
71 break;
72 }
73 len += count;
74 size -= count;
75 }
76 }
77
78 modalias[len] = '\0';
79 return len;
80 }
81
82 static ssize_t
83 acpi_device_modalias_show(struct device *dev, struct device_attribute *attr, char *buf) {
84 struct acpi_device *acpi_dev = to_acpi_device(dev);
85 int len;
86
87 /* Device has no HID and no CID or string is >1024 */
88 len = create_modalias(acpi_dev, buf, 1024);
89 if (len <= 0)
90 return 0;
91 buf[len++] = '\n';
92 return len;
93 }
94 static DEVICE_ATTR(modalias, 0444, acpi_device_modalias_show, NULL);
95
96 static int acpi_bus_hot_remove_device(void *context)
97 {
98 struct acpi_device *device;
99 acpi_handle handle = context;
100 struct acpi_object_list arg_list;
101 union acpi_object arg;
102 acpi_status status = AE_OK;
103
104 if (acpi_bus_get_device(handle, &device))
105 return 0;
106
107 if (!device)
108 return 0;
109
110 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
111 "Hot-removing device %s...\n", dev_name(&device->dev)));
112
113 if (acpi_bus_trim(device, 1)) {
114 printk(KERN_ERR PREFIX
115 "Removing device failed\n");
116 return -1;
117 }
118
119 /* power off device */
120 status = acpi_evaluate_object(handle, "_PS3", NULL, NULL);
121 if (ACPI_FAILURE(status) && status != AE_NOT_FOUND)
122 printk(KERN_WARNING PREFIX
123 "Power-off device failed\n");
124
125 if (device->flags.lockable) {
126 arg_list.count = 1;
127 arg_list.pointer = &arg;
128 arg.type = ACPI_TYPE_INTEGER;
129 arg.integer.value = 0;
130 acpi_evaluate_object(handle, "_LCK", &arg_list, NULL);
131 }
132
133 arg_list.count = 1;
134 arg_list.pointer = &arg;
135 arg.type = ACPI_TYPE_INTEGER;
136 arg.integer.value = 1;
137
138 /*
139 * TBD: _EJD support.
140 */
141 status = acpi_evaluate_object(handle, "_EJ0", &arg_list, NULL);
142 if (ACPI_FAILURE(status))
143 return -ENODEV;
144
145 return 0;
146 }
147
148 static ssize_t
149 acpi_eject_store(struct device *d, struct device_attribute *attr,
150 const char *buf, size_t count)
151 {
152 int ret = count;
153 acpi_status status;
154 acpi_object_type type = 0;
155 struct acpi_device *acpi_device = to_acpi_device(d);
156 struct task_struct *task;
157
158 if ((!count) || (buf[0] != '1')) {
159 return -EINVAL;
160 }
161 #ifndef FORCE_EJECT
162 if (acpi_device->driver == NULL) {
163 ret = -ENODEV;
164 goto err;
165 }
166 #endif
167 status = acpi_get_type(acpi_device->handle, &type);
168 if (ACPI_FAILURE(status) || (!acpi_device->flags.ejectable)) {
169 ret = -ENODEV;
170 goto err;
171 }
172
173 /* remove the device in another thread to fix the deadlock issue */
174 task = kthread_run(acpi_bus_hot_remove_device,
175 acpi_device->handle, "acpi_hot_remove_device");
176 if (IS_ERR(task))
177 ret = PTR_ERR(task);
178 err:
179 return ret;
180 }
181
182 static DEVICE_ATTR(eject, 0200, NULL, acpi_eject_store);
183
184 static ssize_t
185 acpi_device_hid_show(struct device *dev, struct device_attribute *attr, char *buf) {
186 struct acpi_device *acpi_dev = to_acpi_device(dev);
187
188 return sprintf(buf, "%s\n", acpi_dev->pnp.hardware_id);
189 }
190 static DEVICE_ATTR(hid, 0444, acpi_device_hid_show, NULL);
191
192 static ssize_t
193 acpi_device_path_show(struct device *dev, struct device_attribute *attr, char *buf) {
194 struct acpi_device *acpi_dev = to_acpi_device(dev);
195 struct acpi_buffer path = {ACPI_ALLOCATE_BUFFER, NULL};
196 int result;
197
198 result = acpi_get_name(acpi_dev->handle, ACPI_FULL_PATHNAME, &path);
199 if(result)
200 goto end;
201
202 result = sprintf(buf, "%s\n", (char*)path.pointer);
203 kfree(path.pointer);
204 end:
205 return result;
206 }
207 static DEVICE_ATTR(path, 0444, acpi_device_path_show, NULL);
208
209 static int acpi_device_setup_files(struct acpi_device *dev)
210 {
211 acpi_status status;
212 acpi_handle temp;
213 int result = 0;
214
215 /*
216 * Devices gotten from FADT don't have a "path" attribute
217 */
218 if(dev->handle) {
219 result = device_create_file(&dev->dev, &dev_attr_path);
220 if(result)
221 goto end;
222 }
223
224 if(dev->flags.hardware_id) {
225 result = device_create_file(&dev->dev, &dev_attr_hid);
226 if(result)
227 goto end;
228 }
229
230 if (dev->flags.hardware_id || dev->flags.compatible_ids){
231 result = device_create_file(&dev->dev, &dev_attr_modalias);
232 if(result)
233 goto end;
234 }
235
236 /*
237 * If device has _EJ0, 'eject' file is created that is used to trigger
238 * hot-removal function from userland.
239 */
240 status = acpi_get_handle(dev->handle, "_EJ0", &temp);
241 if (ACPI_SUCCESS(status))
242 result = device_create_file(&dev->dev, &dev_attr_eject);
243 end:
244 return result;
245 }
246
247 static void acpi_device_remove_files(struct acpi_device *dev)
248 {
249 acpi_status status;
250 acpi_handle temp;
251
252 /*
253 * If device has _EJ0, 'eject' file is created that is used to trigger
254 * hot-removal function from userland.
255 */
256 status = acpi_get_handle(dev->handle, "_EJ0", &temp);
257 if (ACPI_SUCCESS(status))
258 device_remove_file(&dev->dev, &dev_attr_eject);
259
260 if (dev->flags.hardware_id || dev->flags.compatible_ids)
261 device_remove_file(&dev->dev, &dev_attr_modalias);
262
263 if(dev->flags.hardware_id)
264 device_remove_file(&dev->dev, &dev_attr_hid);
265 if(dev->handle)
266 device_remove_file(&dev->dev, &dev_attr_path);
267 }
268 /* --------------------------------------------------------------------------
269 ACPI Bus operations
270 -------------------------------------------------------------------------- */
271
272 int acpi_match_device_ids(struct acpi_device *device,
273 const struct acpi_device_id *ids)
274 {
275 const struct acpi_device_id *id;
276
277 /*
278 * If the device is not present, it is unnecessary to load device
279 * driver for it.
280 */
281 if (!device->status.present)
282 return -ENODEV;
283
284 if (device->flags.hardware_id) {
285 for (id = ids; id->id[0]; id++) {
286 if (!strcmp((char*)id->id, device->pnp.hardware_id))
287 return 0;
288 }
289 }
290
291 if (device->flags.compatible_ids) {
292 struct acpi_compatible_id_list *cid_list = device->pnp.cid_list;
293 int i;
294
295 for (id = ids; id->id[0]; id++) {
296 /* compare multiple _CID entries against driver ids */
297 for (i = 0; i < cid_list->count; i++) {
298 if (!strcmp((char*)id->id,
299 cid_list->id[i].value))
300 return 0;
301 }
302 }
303 }
304
305 return -ENOENT;
306 }
307 EXPORT_SYMBOL(acpi_match_device_ids);
308
309 static void acpi_device_release(struct device *dev)
310 {
311 struct acpi_device *acpi_dev = to_acpi_device(dev);
312
313 kfree(acpi_dev->pnp.cid_list);
314 kfree(acpi_dev);
315 }
316
317 static int acpi_device_suspend(struct device *dev, pm_message_t state)
318 {
319 struct acpi_device *acpi_dev = to_acpi_device(dev);
320 struct acpi_driver *acpi_drv = acpi_dev->driver;
321
322 if (acpi_drv && acpi_drv->ops.suspend)
323 return acpi_drv->ops.suspend(acpi_dev, state);
324 return 0;
325 }
326
327 static int acpi_device_resume(struct device *dev)
328 {
329 struct acpi_device *acpi_dev = to_acpi_device(dev);
330 struct acpi_driver *acpi_drv = acpi_dev->driver;
331
332 if (acpi_drv && acpi_drv->ops.resume)
333 return acpi_drv->ops.resume(acpi_dev);
334 return 0;
335 }
336
337 static int acpi_bus_match(struct device *dev, struct device_driver *drv)
338 {
339 struct acpi_device *acpi_dev = to_acpi_device(dev);
340 struct acpi_driver *acpi_drv = to_acpi_driver(drv);
341
342 return !acpi_match_device_ids(acpi_dev, acpi_drv->ids);
343 }
344
345 static int acpi_device_uevent(struct device *dev, struct kobj_uevent_env *env)
346 {
347 struct acpi_device *acpi_dev = to_acpi_device(dev);
348 int len;
349
350 if (add_uevent_var(env, "MODALIAS="))
351 return -ENOMEM;
352 len = create_modalias(acpi_dev, &env->buf[env->buflen - 1],
353 sizeof(env->buf) - env->buflen);
354 if (len >= (sizeof(env->buf) - env->buflen))
355 return -ENOMEM;
356 env->buflen += len;
357 return 0;
358 }
359
360 static int acpi_bus_driver_init(struct acpi_device *, struct acpi_driver *);
361 static int acpi_start_single_object(struct acpi_device *);
362 static int acpi_device_probe(struct device * dev)
363 {
364 struct acpi_device *acpi_dev = to_acpi_device(dev);
365 struct acpi_driver *acpi_drv = to_acpi_driver(dev->driver);
366 int ret;
367
368 ret = acpi_bus_driver_init(acpi_dev, acpi_drv);
369 if (!ret) {
370 if (acpi_dev->bus_ops.acpi_op_start)
371 acpi_start_single_object(acpi_dev);
372 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
373 "Found driver [%s] for device [%s]\n",
374 acpi_drv->name, acpi_dev->pnp.bus_id));
375 get_device(dev);
376 }
377 return ret;
378 }
379
380 static int acpi_device_remove(struct device * dev)
381 {
382 struct acpi_device *acpi_dev = to_acpi_device(dev);
383 struct acpi_driver *acpi_drv = acpi_dev->driver;
384
385 if (acpi_drv) {
386 if (acpi_drv->ops.stop)
387 acpi_drv->ops.stop(acpi_dev, acpi_dev->removal_type);
388 if (acpi_drv->ops.remove)
389 acpi_drv->ops.remove(acpi_dev, acpi_dev->removal_type);
390 }
391 acpi_dev->driver = NULL;
392 acpi_dev->driver_data = NULL;
393
394 put_device(dev);
395 return 0;
396 }
397
398 static void acpi_device_shutdown(struct device *dev)
399 {
400 struct acpi_device *acpi_dev = to_acpi_device(dev);
401 struct acpi_driver *acpi_drv = acpi_dev->driver;
402
403 if (acpi_drv && acpi_drv->ops.shutdown)
404 acpi_drv->ops.shutdown(acpi_dev);
405
406 return ;
407 }
408
409 struct bus_type acpi_bus_type = {
410 .name = "acpi",
411 .suspend = acpi_device_suspend,
412 .resume = acpi_device_resume,
413 .shutdown = acpi_device_shutdown,
414 .match = acpi_bus_match,
415 .probe = acpi_device_probe,
416 .remove = acpi_device_remove,
417 .uevent = acpi_device_uevent,
418 };
419
420 static int acpi_device_register(struct acpi_device *device,
421 struct acpi_device *parent)
422 {
423 int result;
424 struct acpi_device_bus_id *acpi_device_bus_id, *new_bus_id;
425 int found = 0;
426 /*
427 * Linkage
428 * -------
429 * Link this device to its parent and siblings.
430 */
431 INIT_LIST_HEAD(&device->children);
432 INIT_LIST_HEAD(&device->node);
433 INIT_LIST_HEAD(&device->g_list);
434 INIT_LIST_HEAD(&device->wakeup_list);
435
436 new_bus_id = kzalloc(sizeof(struct acpi_device_bus_id), GFP_KERNEL);
437 if (!new_bus_id) {
438 printk(KERN_ERR PREFIX "Memory allocation error\n");
439 return -ENOMEM;
440 }
441
442 spin_lock(&acpi_device_lock);
443 /*
444 * Find suitable bus_id and instance number in acpi_bus_id_list
445 * If failed, create one and link it into acpi_bus_id_list
446 */
447 list_for_each_entry(acpi_device_bus_id, &acpi_bus_id_list, node) {
448 if(!strcmp(acpi_device_bus_id->bus_id, device->flags.hardware_id? device->pnp.hardware_id : "device")) {
449 acpi_device_bus_id->instance_no ++;
450 found = 1;
451 kfree(new_bus_id);
452 break;
453 }
454 }
455 if(!found) {
456 acpi_device_bus_id = new_bus_id;
457 strcpy(acpi_device_bus_id->bus_id, device->flags.hardware_id ? device->pnp.hardware_id : "device");
458 acpi_device_bus_id->instance_no = 0;
459 list_add_tail(&acpi_device_bus_id->node, &acpi_bus_id_list);
460 }
461 dev_set_name(&device->dev, "%s:%02x", acpi_device_bus_id->bus_id, acpi_device_bus_id->instance_no);
462
463 if (device->parent) {
464 list_add_tail(&device->node, &device->parent->children);
465 list_add_tail(&device->g_list, &device->parent->g_list);
466 } else
467 list_add_tail(&device->g_list, &acpi_device_list);
468 if (device->wakeup.flags.valid)
469 list_add_tail(&device->wakeup_list, &acpi_wakeup_device_list);
470 spin_unlock(&acpi_device_lock);
471
472 if (device->parent)
473 device->dev.parent = &parent->dev;
474 device->dev.bus = &acpi_bus_type;
475 device_initialize(&device->dev);
476 device->dev.release = &acpi_device_release;
477 result = device_add(&device->dev);
478 if(result) {
479 dev_err(&device->dev, "Error adding device\n");
480 goto end;
481 }
482
483 result = acpi_device_setup_files(device);
484 if(result)
485 printk(KERN_ERR PREFIX "Error creating sysfs interface for device %s\n",
486 dev_name(&device->dev));
487
488 device->removal_type = ACPI_BUS_REMOVAL_NORMAL;
489 return 0;
490 end:
491 spin_lock(&acpi_device_lock);
492 if (device->parent) {
493 list_del(&device->node);
494 list_del(&device->g_list);
495 } else
496 list_del(&device->g_list);
497 list_del(&device->wakeup_list);
498 spin_unlock(&acpi_device_lock);
499 return result;
500 }
501
502 static void acpi_device_unregister(struct acpi_device *device, int type)
503 {
504 spin_lock(&acpi_device_lock);
505 if (device->parent) {
506 list_del(&device->node);
507 list_del(&device->g_list);
508 } else
509 list_del(&device->g_list);
510
511 list_del(&device->wakeup_list);
512 spin_unlock(&acpi_device_lock);
513
514 acpi_detach_data(device->handle, acpi_bus_data_handler);
515
516 acpi_device_remove_files(device);
517 device_unregister(&device->dev);
518 }
519
520 /* --------------------------------------------------------------------------
521 Driver Management
522 -------------------------------------------------------------------------- */
523 /**
524 * acpi_bus_driver_init - add a device to a driver
525 * @device: the device to add and initialize
526 * @driver: driver for the device
527 *
528 * Used to initialize a device via its device driver. Called whenever a
529 * driver is bound to a device. Invokes the driver's add() ops.
530 */
531 static int
532 acpi_bus_driver_init(struct acpi_device *device, struct acpi_driver *driver)
533 {
534 int result = 0;
535
536
537 if (!device || !driver)
538 return -EINVAL;
539
540 if (!driver->ops.add)
541 return -ENOSYS;
542
543 result = driver->ops.add(device);
544 if (result) {
545 device->driver = NULL;
546 device->driver_data = NULL;
547 return result;
548 }
549
550 device->driver = driver;
551
552 /*
553 * TBD - Configuration Management: Assign resources to device based
554 * upon possible configuration and currently allocated resources.
555 */
556
557 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
558 "Driver successfully bound to device\n"));
559 return 0;
560 }
561
562 static int acpi_start_single_object(struct acpi_device *device)
563 {
564 int result = 0;
565 struct acpi_driver *driver;
566
567
568 if (!(driver = device->driver))
569 return 0;
570
571 if (driver->ops.start) {
572 result = driver->ops.start(device);
573 if (result && driver->ops.remove)
574 driver->ops.remove(device, ACPI_BUS_REMOVAL_NORMAL);
575 }
576
577 return result;
578 }
579
580 /**
581 * acpi_bus_register_driver - register a driver with the ACPI bus
582 * @driver: driver being registered
583 *
584 * Registers a driver with the ACPI bus. Searches the namespace for all
585 * devices that match the driver's criteria and binds. Returns zero for
586 * success or a negative error status for failure.
587 */
588 int acpi_bus_register_driver(struct acpi_driver *driver)
589 {
590 int ret;
591
592 if (acpi_disabled)
593 return -ENODEV;
594 driver->drv.name = driver->name;
595 driver->drv.bus = &acpi_bus_type;
596 driver->drv.owner = driver->owner;
597
598 ret = driver_register(&driver->drv);
599 return ret;
600 }
601
602 EXPORT_SYMBOL(acpi_bus_register_driver);
603
604 /**
605 * acpi_bus_unregister_driver - unregisters a driver with the APIC bus
606 * @driver: driver to unregister
607 *
608 * Unregisters a driver with the ACPI bus. Searches the namespace for all
609 * devices that match the driver's criteria and unbinds.
610 */
611 void acpi_bus_unregister_driver(struct acpi_driver *driver)
612 {
613 driver_unregister(&driver->drv);
614 }
615
616 EXPORT_SYMBOL(acpi_bus_unregister_driver);
617
618 /* --------------------------------------------------------------------------
619 Device Enumeration
620 -------------------------------------------------------------------------- */
621 acpi_status
622 acpi_bus_get_ejd(acpi_handle handle, acpi_handle *ejd)
623 {
624 acpi_status status;
625 acpi_handle tmp;
626 struct acpi_buffer buffer = {ACPI_ALLOCATE_BUFFER, NULL};
627 union acpi_object *obj;
628
629 status = acpi_get_handle(handle, "_EJD", &tmp);
630 if (ACPI_FAILURE(status))
631 return status;
632
633 status = acpi_evaluate_object(handle, "_EJD", NULL, &buffer);
634 if (ACPI_SUCCESS(status)) {
635 obj = buffer.pointer;
636 status = acpi_get_handle(ACPI_ROOT_OBJECT, obj->string.pointer,
637 ejd);
638 kfree(buffer.pointer);
639 }
640 return status;
641 }
642 EXPORT_SYMBOL_GPL(acpi_bus_get_ejd);
643
644 void acpi_bus_data_handler(acpi_handle handle, u32 function, void *context)
645 {
646
647 /* TBD */
648
649 return;
650 }
651
652 static int acpi_bus_get_perf_flags(struct acpi_device *device)
653 {
654 device->performance.state = ACPI_STATE_UNKNOWN;
655 return 0;
656 }
657
658 static acpi_status
659 acpi_bus_extract_wakeup_device_power_package(struct acpi_device *device,
660 union acpi_object *package)
661 {
662 int i = 0;
663 union acpi_object *element = NULL;
664
665 if (!device || !package || (package->package.count < 2))
666 return AE_BAD_PARAMETER;
667
668 element = &(package->package.elements[0]);
669 if (!element)
670 return AE_BAD_PARAMETER;
671 if (element->type == ACPI_TYPE_PACKAGE) {
672 if ((element->package.count < 2) ||
673 (element->package.elements[0].type !=
674 ACPI_TYPE_LOCAL_REFERENCE)
675 || (element->package.elements[1].type != ACPI_TYPE_INTEGER))
676 return AE_BAD_DATA;
677 device->wakeup.gpe_device =
678 element->package.elements[0].reference.handle;
679 device->wakeup.gpe_number =
680 (u32) element->package.elements[1].integer.value;
681 } else if (element->type == ACPI_TYPE_INTEGER) {
682 device->wakeup.gpe_number = element->integer.value;
683 } else
684 return AE_BAD_DATA;
685
686 element = &(package->package.elements[1]);
687 if (element->type != ACPI_TYPE_INTEGER) {
688 return AE_BAD_DATA;
689 }
690 device->wakeup.sleep_state = element->integer.value;
691
692 if ((package->package.count - 2) > ACPI_MAX_HANDLES) {
693 return AE_NO_MEMORY;
694 }
695 device->wakeup.resources.count = package->package.count - 2;
696 for (i = 0; i < device->wakeup.resources.count; i++) {
697 element = &(package->package.elements[i + 2]);
698 if (element->type != ACPI_TYPE_LOCAL_REFERENCE)
699 return AE_BAD_DATA;
700
701 device->wakeup.resources.handles[i] = element->reference.handle;
702 }
703
704 return AE_OK;
705 }
706
707 static int acpi_bus_get_wakeup_device_flags(struct acpi_device *device)
708 {
709 acpi_status status = 0;
710 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
711 union acpi_object *package = NULL;
712 int psw_error;
713
714 struct acpi_device_id button_device_ids[] = {
715 {"PNP0C0D", 0},
716 {"PNP0C0C", 0},
717 {"PNP0C0E", 0},
718 {"", 0},
719 };
720
721 /* _PRW */
722 status = acpi_evaluate_object(device->handle, "_PRW", NULL, &buffer);
723 if (ACPI_FAILURE(status)) {
724 ACPI_EXCEPTION((AE_INFO, status, "Evaluating _PRW"));
725 goto end;
726 }
727
728 package = (union acpi_object *)buffer.pointer;
729 status = acpi_bus_extract_wakeup_device_power_package(device, package);
730 if (ACPI_FAILURE(status)) {
731 ACPI_EXCEPTION((AE_INFO, status, "Extracting _PRW package"));
732 goto end;
733 }
734
735 kfree(buffer.pointer);
736
737 device->wakeup.flags.valid = 1;
738 /* Call _PSW/_DSW object to disable its ability to wake the sleeping
739 * system for the ACPI device with the _PRW object.
740 * The _PSW object is depreciated in ACPI 3.0 and is replaced by _DSW.
741 * So it is necessary to call _DSW object first. Only when it is not
742 * present will the _PSW object used.
743 */
744 psw_error = acpi_device_sleep_wake(device, 0, 0, 0);
745 if (psw_error)
746 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
747 "error in _DSW or _PSW evaluation\n"));
748
749 /* Power button, Lid switch always enable wakeup */
750 if (!acpi_match_device_ids(device, button_device_ids))
751 device->wakeup.flags.run_wake = 1;
752
753 end:
754 if (ACPI_FAILURE(status))
755 device->flags.wake_capable = 0;
756 return 0;
757 }
758
759 static int acpi_bus_get_power_flags(struct acpi_device *device)
760 {
761 acpi_status status = 0;
762 acpi_handle handle = NULL;
763 u32 i = 0;
764
765
766 /*
767 * Power Management Flags
768 */
769 status = acpi_get_handle(device->handle, "_PSC", &handle);
770 if (ACPI_SUCCESS(status))
771 device->power.flags.explicit_get = 1;
772 status = acpi_get_handle(device->handle, "_IRC", &handle);
773 if (ACPI_SUCCESS(status))
774 device->power.flags.inrush_current = 1;
775
776 /*
777 * Enumerate supported power management states
778 */
779 for (i = ACPI_STATE_D0; i <= ACPI_STATE_D3; i++) {
780 struct acpi_device_power_state *ps = &device->power.states[i];
781 char object_name[5] = { '_', 'P', 'R', '0' + i, '\0' };
782
783 /* Evaluate "_PRx" to se if power resources are referenced */
784 acpi_evaluate_reference(device->handle, object_name, NULL,
785 &ps->resources);
786 if (ps->resources.count) {
787 device->power.flags.power_resources = 1;
788 ps->flags.valid = 1;
789 }
790
791 /* Evaluate "_PSx" to see if we can do explicit sets */
792 object_name[2] = 'S';
793 status = acpi_get_handle(device->handle, object_name, &handle);
794 if (ACPI_SUCCESS(status)) {
795 ps->flags.explicit_set = 1;
796 ps->flags.valid = 1;
797 }
798
799 /* State is valid if we have some power control */
800 if (ps->resources.count || ps->flags.explicit_set)
801 ps->flags.valid = 1;
802
803 ps->power = -1; /* Unknown - driver assigned */
804 ps->latency = -1; /* Unknown - driver assigned */
805 }
806
807 /* Set defaults for D0 and D3 states (always valid) */
808 device->power.states[ACPI_STATE_D0].flags.valid = 1;
809 device->power.states[ACPI_STATE_D0].power = 100;
810 device->power.states[ACPI_STATE_D3].flags.valid = 1;
811 device->power.states[ACPI_STATE_D3].power = 0;
812
813 /* TBD: System wake support and resource requirements. */
814
815 device->power.state = ACPI_STATE_UNKNOWN;
816 acpi_bus_get_power(device->handle, &(device->power.state));
817
818 return 0;
819 }
820
821 static int acpi_bus_get_flags(struct acpi_device *device)
822 {
823 acpi_status status = AE_OK;
824 acpi_handle temp = NULL;
825
826
827 /* Presence of _STA indicates 'dynamic_status' */
828 status = acpi_get_handle(device->handle, "_STA", &temp);
829 if (ACPI_SUCCESS(status))
830 device->flags.dynamic_status = 1;
831
832 /* Presence of _CID indicates 'compatible_ids' */
833 status = acpi_get_handle(device->handle, "_CID", &temp);
834 if (ACPI_SUCCESS(status))
835 device->flags.compatible_ids = 1;
836
837 /* Presence of _RMV indicates 'removable' */
838 status = acpi_get_handle(device->handle, "_RMV", &temp);
839 if (ACPI_SUCCESS(status))
840 device->flags.removable = 1;
841
842 /* Presence of _EJD|_EJ0 indicates 'ejectable' */
843 status = acpi_get_handle(device->handle, "_EJD", &temp);
844 if (ACPI_SUCCESS(status))
845 device->flags.ejectable = 1;
846 else {
847 status = acpi_get_handle(device->handle, "_EJ0", &temp);
848 if (ACPI_SUCCESS(status))
849 device->flags.ejectable = 1;
850 }
851
852 /* Presence of _LCK indicates 'lockable' */
853 status = acpi_get_handle(device->handle, "_LCK", &temp);
854 if (ACPI_SUCCESS(status))
855 device->flags.lockable = 1;
856
857 /* Presence of _PS0|_PR0 indicates 'power manageable' */
858 status = acpi_get_handle(device->handle, "_PS0", &temp);
859 if (ACPI_FAILURE(status))
860 status = acpi_get_handle(device->handle, "_PR0", &temp);
861 if (ACPI_SUCCESS(status))
862 device->flags.power_manageable = 1;
863
864 /* Presence of _PRW indicates wake capable */
865 status = acpi_get_handle(device->handle, "_PRW", &temp);
866 if (ACPI_SUCCESS(status))
867 device->flags.wake_capable = 1;
868
869 /* TBD: Performance management */
870
871 return 0;
872 }
873
874 static void acpi_device_get_busid(struct acpi_device *device,
875 acpi_handle handle, int type)
876 {
877 char bus_id[5] = { '?', 0 };
878 struct acpi_buffer buffer = { sizeof(bus_id), bus_id };
879 int i = 0;
880
881 /*
882 * Bus ID
883 * ------
884 * The device's Bus ID is simply the object name.
885 * TBD: Shouldn't this value be unique (within the ACPI namespace)?
886 */
887 switch (type) {
888 case ACPI_BUS_TYPE_SYSTEM:
889 strcpy(device->pnp.bus_id, "ACPI");
890 break;
891 case ACPI_BUS_TYPE_POWER_BUTTON:
892 strcpy(device->pnp.bus_id, "PWRF");
893 break;
894 case ACPI_BUS_TYPE_SLEEP_BUTTON:
895 strcpy(device->pnp.bus_id, "SLPF");
896 break;
897 default:
898 acpi_get_name(handle, ACPI_SINGLE_NAME, &buffer);
899 /* Clean up trailing underscores (if any) */
900 for (i = 3; i > 1; i--) {
901 if (bus_id[i] == '_')
902 bus_id[i] = '\0';
903 else
904 break;
905 }
906 strcpy(device->pnp.bus_id, bus_id);
907 break;
908 }
909 }
910
911 /*
912 * acpi_bay_match - see if a device is an ejectable driver bay
913 *
914 * If an acpi object is ejectable and has one of the ACPI ATA methods defined,
915 * then we can safely call it an ejectable drive bay
916 */
917 static int acpi_bay_match(struct acpi_device *device){
918 acpi_status status;
919 acpi_handle handle;
920 acpi_handle tmp;
921 acpi_handle phandle;
922
923 handle = device->handle;
924
925 status = acpi_get_handle(handle, "_EJ0", &tmp);
926 if (ACPI_FAILURE(status))
927 return -ENODEV;
928
929 if ((ACPI_SUCCESS(acpi_get_handle(handle, "_GTF", &tmp))) ||
930 (ACPI_SUCCESS(acpi_get_handle(handle, "_GTM", &tmp))) ||
931 (ACPI_SUCCESS(acpi_get_handle(handle, "_STM", &tmp))) ||
932 (ACPI_SUCCESS(acpi_get_handle(handle, "_SDD", &tmp))))
933 return 0;
934
935 if (acpi_get_parent(handle, &phandle))
936 return -ENODEV;
937
938 if ((ACPI_SUCCESS(acpi_get_handle(phandle, "_GTF", &tmp))) ||
939 (ACPI_SUCCESS(acpi_get_handle(phandle, "_GTM", &tmp))) ||
940 (ACPI_SUCCESS(acpi_get_handle(phandle, "_STM", &tmp))) ||
941 (ACPI_SUCCESS(acpi_get_handle(phandle, "_SDD", &tmp))))
942 return 0;
943
944 return -ENODEV;
945 }
946
947 /*
948 * acpi_dock_match - see if a device has a _DCK method
949 */
950 static int acpi_dock_match(struct acpi_device *device)
951 {
952 acpi_handle tmp;
953 return acpi_get_handle(device->handle, "_DCK", &tmp);
954 }
955
956 static void acpi_device_set_id(struct acpi_device *device,
957 struct acpi_device *parent, acpi_handle handle,
958 int type)
959 {
960 struct acpi_device_info *info;
961 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
962 char *hid = NULL;
963 char *uid = NULL;
964 struct acpi_compatible_id_list *cid_list = NULL;
965 const char *cid_add = NULL;
966 acpi_status status;
967
968 switch (type) {
969 case ACPI_BUS_TYPE_DEVICE:
970 status = acpi_get_object_info(handle, &buffer);
971 if (ACPI_FAILURE(status)) {
972 printk(KERN_ERR PREFIX "%s: Error reading device info\n", __func__);
973 return;
974 }
975
976 info = buffer.pointer;
977 if (info->valid & ACPI_VALID_HID)
978 hid = info->hardware_id.value;
979 if (info->valid & ACPI_VALID_UID)
980 uid = info->unique_id.value;
981 if (info->valid & ACPI_VALID_CID)
982 cid_list = &info->compatibility_id;
983 if (info->valid & ACPI_VALID_ADR) {
984 device->pnp.bus_address = info->address;
985 device->flags.bus_address = 1;
986 }
987
988 /* If we have a video/bay/dock device, add our selfdefined
989 HID to the CID list. Like that the video/bay/dock drivers
990 will get autoloaded and the device might still match
991 against another driver.
992 */
993 if (acpi_is_video_device(device))
994 cid_add = ACPI_VIDEO_HID;
995 else if (ACPI_SUCCESS(acpi_bay_match(device)))
996 cid_add = ACPI_BAY_HID;
997 else if (ACPI_SUCCESS(acpi_dock_match(device)))
998 cid_add = ACPI_DOCK_HID;
999
1000 break;
1001 case ACPI_BUS_TYPE_POWER:
1002 hid = ACPI_POWER_HID;
1003 break;
1004 case ACPI_BUS_TYPE_PROCESSOR:
1005 hid = ACPI_PROCESSOR_OBJECT_HID;
1006 break;
1007 case ACPI_BUS_TYPE_SYSTEM:
1008 hid = ACPI_SYSTEM_HID;
1009 break;
1010 case ACPI_BUS_TYPE_THERMAL:
1011 hid = ACPI_THERMAL_HID;
1012 break;
1013 case ACPI_BUS_TYPE_POWER_BUTTON:
1014 hid = ACPI_BUTTON_HID_POWERF;
1015 break;
1016 case ACPI_BUS_TYPE_SLEEP_BUTTON:
1017 hid = ACPI_BUTTON_HID_SLEEPF;
1018 break;
1019 }
1020
1021 /*
1022 * \_SB
1023 * ----
1024 * Fix for the system root bus device -- the only root-level device.
1025 */
1026 if (((acpi_handle)parent == ACPI_ROOT_OBJECT) && (type == ACPI_BUS_TYPE_DEVICE)) {
1027 hid = ACPI_BUS_HID;
1028 strcpy(device->pnp.device_name, ACPI_BUS_DEVICE_NAME);
1029 strcpy(device->pnp.device_class, ACPI_BUS_CLASS);
1030 }
1031
1032 if (hid) {
1033 strcpy(device->pnp.hardware_id, hid);
1034 device->flags.hardware_id = 1;
1035 }
1036 if (uid) {
1037 strcpy(device->pnp.unique_id, uid);
1038 device->flags.unique_id = 1;
1039 }
1040 if (cid_list || cid_add) {
1041 struct acpi_compatible_id_list *list;
1042 int size = 0;
1043 int count = 0;
1044
1045 if (cid_list) {
1046 size = cid_list->size;
1047 } else if (cid_add) {
1048 size = sizeof(struct acpi_compatible_id_list);
1049 cid_list = ACPI_ALLOCATE_ZEROED((acpi_size) size);
1050 if (!cid_list) {
1051 printk(KERN_ERR "Memory allocation error\n");
1052 kfree(buffer.pointer);
1053 return;
1054 } else {
1055 cid_list->count = 0;
1056 cid_list->size = size;
1057 }
1058 }
1059 if (cid_add)
1060 size += sizeof(struct acpi_compatible_id);
1061 list = kmalloc(size, GFP_KERNEL);
1062
1063 if (list) {
1064 if (cid_list) {
1065 memcpy(list, cid_list, cid_list->size);
1066 count = cid_list->count;
1067 }
1068 if (cid_add) {
1069 strncpy(list->id[count].value, cid_add,
1070 ACPI_MAX_CID_LENGTH);
1071 count++;
1072 device->flags.compatible_ids = 1;
1073 }
1074 list->size = size;
1075 list->count = count;
1076 device->pnp.cid_list = list;
1077 } else
1078 printk(KERN_ERR PREFIX "Memory allocation error\n");
1079 }
1080
1081 kfree(buffer.pointer);
1082 }
1083
1084 static int acpi_device_set_context(struct acpi_device *device, int type)
1085 {
1086 acpi_status status = AE_OK;
1087 int result = 0;
1088 /*
1089 * Context
1090 * -------
1091 * Attach this 'struct acpi_device' to the ACPI object. This makes
1092 * resolutions from handle->device very efficient. Note that we need
1093 * to be careful with fixed-feature devices as they all attach to the
1094 * root object.
1095 */
1096 if (type != ACPI_BUS_TYPE_POWER_BUTTON &&
1097 type != ACPI_BUS_TYPE_SLEEP_BUTTON) {
1098 status = acpi_attach_data(device->handle,
1099 acpi_bus_data_handler, device);
1100
1101 if (ACPI_FAILURE(status)) {
1102 printk(KERN_ERR PREFIX "Error attaching device data\n");
1103 result = -ENODEV;
1104 }
1105 }
1106 return result;
1107 }
1108
1109 static int acpi_bus_remove(struct acpi_device *dev, int rmdevice)
1110 {
1111 if (!dev)
1112 return -EINVAL;
1113
1114 dev->removal_type = ACPI_BUS_REMOVAL_EJECT;
1115 device_release_driver(&dev->dev);
1116
1117 if (!rmdevice)
1118 return 0;
1119
1120 /*
1121 * unbind _ADR-Based Devices when hot removal
1122 */
1123 if (dev->flags.bus_address) {
1124 if ((dev->parent) && (dev->parent->ops.unbind))
1125 dev->parent->ops.unbind(dev);
1126 }
1127 acpi_device_unregister(dev, ACPI_BUS_REMOVAL_EJECT);
1128
1129 return 0;
1130 }
1131
1132 static int
1133 acpi_add_single_object(struct acpi_device **child,
1134 struct acpi_device *parent, acpi_handle handle, int type,
1135 struct acpi_bus_ops *ops)
1136 {
1137 int result = 0;
1138 struct acpi_device *device = NULL;
1139
1140
1141 if (!child)
1142 return -EINVAL;
1143
1144 device = kzalloc(sizeof(struct acpi_device), GFP_KERNEL);
1145 if (!device) {
1146 printk(KERN_ERR PREFIX "Memory allocation error\n");
1147 return -ENOMEM;
1148 }
1149
1150 device->handle = handle;
1151 device->parent = parent;
1152 device->bus_ops = *ops; /* workround for not call .start */
1153
1154
1155 acpi_device_get_busid(device, handle, type);
1156
1157 /*
1158 * Flags
1159 * -----
1160 * Get prior to calling acpi_bus_get_status() so we know whether
1161 * or not _STA is present. Note that we only look for object
1162 * handles -- cannot evaluate objects until we know the device is
1163 * present and properly initialized.
1164 */
1165 result = acpi_bus_get_flags(device);
1166 if (result)
1167 goto end;
1168
1169 /*
1170 * Status
1171 * ------
1172 * See if the device is present. We always assume that non-Device
1173 * and non-Processor objects (e.g. thermal zones, power resources,
1174 * etc.) are present, functioning, etc. (at least when parent object
1175 * is present). Note that _STA has a different meaning for some
1176 * objects (e.g. power resources) so we need to be careful how we use
1177 * it.
1178 */
1179 switch (type) {
1180 case ACPI_BUS_TYPE_PROCESSOR:
1181 case ACPI_BUS_TYPE_DEVICE:
1182 result = acpi_bus_get_status(device);
1183 if (ACPI_FAILURE(result)) {
1184 result = -ENODEV;
1185 goto end;
1186 }
1187 /*
1188 * When the device is neither present nor functional, the
1189 * device should not be added to Linux ACPI device tree.
1190 * When the status of the device is not present but functinal,
1191 * it should be added to Linux ACPI tree. For example : bay
1192 * device , dock device.
1193 * In such conditions it is unncessary to check whether it is
1194 * bay device or dock device.
1195 */
1196 if (!device->status.present && !device->status.functional) {
1197 result = -ENODEV;
1198 goto end;
1199 }
1200 break;
1201 default:
1202 STRUCT_TO_INT(device->status) =
1203 ACPI_STA_DEVICE_PRESENT | ACPI_STA_DEVICE_ENABLED |
1204 ACPI_STA_DEVICE_UI | ACPI_STA_DEVICE_FUNCTIONING;
1205 break;
1206 }
1207
1208 /*
1209 * Initialize Device
1210 * -----------------
1211 * TBD: Synch with Core's enumeration/initialization process.
1212 */
1213
1214 /*
1215 * Hardware ID, Unique ID, & Bus Address
1216 * -------------------------------------
1217 */
1218 acpi_device_set_id(device, parent, handle, type);
1219
1220 /*
1221 * The ACPI device is attached to acpi handle before getting
1222 * the power/wakeup/peformance flags. Otherwise OS can't get
1223 * the corresponding ACPI device by the acpi handle in the course
1224 * of getting the power/wakeup/performance flags.
1225 */
1226 result = acpi_device_set_context(device, type);
1227 if (result)
1228 goto end;
1229
1230 /*
1231 * Power Management
1232 * ----------------
1233 */
1234 if (device->flags.power_manageable) {
1235 result = acpi_bus_get_power_flags(device);
1236 if (result)
1237 goto end;
1238 }
1239
1240 /*
1241 * Wakeup device management
1242 *-----------------------
1243 */
1244 if (device->flags.wake_capable) {
1245 result = acpi_bus_get_wakeup_device_flags(device);
1246 if (result)
1247 goto end;
1248 }
1249
1250 /*
1251 * Performance Management
1252 * ----------------------
1253 */
1254 if (device->flags.performance_manageable) {
1255 result = acpi_bus_get_perf_flags(device);
1256 if (result)
1257 goto end;
1258 }
1259
1260
1261 result = acpi_device_register(device, parent);
1262
1263 /*
1264 * Bind _ADR-Based Devices when hot add
1265 */
1266 if (device->flags.bus_address) {
1267 if (device->parent && device->parent->ops.bind)
1268 device->parent->ops.bind(device);
1269 }
1270
1271 end:
1272 if (!result)
1273 *child = device;
1274 else {
1275 kfree(device->pnp.cid_list);
1276 kfree(device);
1277 }
1278
1279 return result;
1280 }
1281
1282 static int acpi_bus_scan(struct acpi_device *start, struct acpi_bus_ops *ops)
1283 {
1284 acpi_status status = AE_OK;
1285 struct acpi_device *parent = NULL;
1286 struct acpi_device *child = NULL;
1287 acpi_handle phandle = NULL;
1288 acpi_handle chandle = NULL;
1289 acpi_object_type type = 0;
1290 u32 level = 1;
1291
1292
1293 if (!start)
1294 return -EINVAL;
1295
1296 parent = start;
1297 phandle = start->handle;
1298
1299 /*
1300 * Parse through the ACPI namespace, identify all 'devices', and
1301 * create a new 'struct acpi_device' for each.
1302 */
1303 while ((level > 0) && parent) {
1304
1305 status = acpi_get_next_object(ACPI_TYPE_ANY, phandle,
1306 chandle, &chandle);
1307
1308 /*
1309 * If this scope is exhausted then move our way back up.
1310 */
1311 if (ACPI_FAILURE(status)) {
1312 level--;
1313 chandle = phandle;
1314 acpi_get_parent(phandle, &phandle);
1315 if (parent->parent)
1316 parent = parent->parent;
1317 continue;
1318 }
1319
1320 status = acpi_get_type(chandle, &type);
1321 if (ACPI_FAILURE(status))
1322 continue;
1323
1324 /*
1325 * If this is a scope object then parse it (depth-first).
1326 */
1327 if (type == ACPI_TYPE_LOCAL_SCOPE) {
1328 level++;
1329 phandle = chandle;
1330 chandle = NULL;
1331 continue;
1332 }
1333
1334 /*
1335 * We're only interested in objects that we consider 'devices'.
1336 */
1337 switch (type) {
1338 case ACPI_TYPE_DEVICE:
1339 type = ACPI_BUS_TYPE_DEVICE;
1340 break;
1341 case ACPI_TYPE_PROCESSOR:
1342 type = ACPI_BUS_TYPE_PROCESSOR;
1343 break;
1344 case ACPI_TYPE_THERMAL:
1345 type = ACPI_BUS_TYPE_THERMAL;
1346 break;
1347 case ACPI_TYPE_POWER:
1348 type = ACPI_BUS_TYPE_POWER;
1349 break;
1350 default:
1351 continue;
1352 }
1353
1354 if (ops->acpi_op_add)
1355 status = acpi_add_single_object(&child, parent,
1356 chandle, type, ops);
1357 else
1358 status = acpi_bus_get_device(chandle, &child);
1359
1360 if (ACPI_FAILURE(status))
1361 continue;
1362
1363 if (ops->acpi_op_start && !(ops->acpi_op_add)) {
1364 status = acpi_start_single_object(child);
1365 if (ACPI_FAILURE(status))
1366 continue;
1367 }
1368
1369 /*
1370 * If the device is present, enabled, and functioning then
1371 * parse its scope (depth-first). Note that we need to
1372 * represent absent devices to facilitate PnP notifications
1373 * -- but only the subtree head (not all of its children,
1374 * which will be enumerated when the parent is inserted).
1375 *
1376 * TBD: Need notifications and other detection mechanisms
1377 * in place before we can fully implement this.
1378 */
1379 /*
1380 * When the device is not present but functional, it is also
1381 * necessary to scan the children of this device.
1382 */
1383 if (child->status.present || (!child->status.present &&
1384 child->status.functional)) {
1385 status = acpi_get_next_object(ACPI_TYPE_ANY, chandle,
1386 NULL, NULL);
1387 if (ACPI_SUCCESS(status)) {
1388 level++;
1389 phandle = chandle;
1390 chandle = NULL;
1391 parent = child;
1392 }
1393 }
1394 }
1395
1396 return 0;
1397 }
1398
1399 int
1400 acpi_bus_add(struct acpi_device **child,
1401 struct acpi_device *parent, acpi_handle handle, int type)
1402 {
1403 int result;
1404 struct acpi_bus_ops ops;
1405
1406 memset(&ops, 0, sizeof(ops));
1407 ops.acpi_op_add = 1;
1408
1409 result = acpi_add_single_object(child, parent, handle, type, &ops);
1410 if (!result)
1411 result = acpi_bus_scan(*child, &ops);
1412
1413 return result;
1414 }
1415
1416 EXPORT_SYMBOL(acpi_bus_add);
1417
1418 int acpi_bus_start(struct acpi_device *device)
1419 {
1420 int result;
1421 struct acpi_bus_ops ops;
1422
1423
1424 if (!device)
1425 return -EINVAL;
1426
1427 result = acpi_start_single_object(device);
1428 if (!result) {
1429 memset(&ops, 0, sizeof(ops));
1430 ops.acpi_op_start = 1;
1431 result = acpi_bus_scan(device, &ops);
1432 }
1433 return result;
1434 }
1435
1436 EXPORT_SYMBOL(acpi_bus_start);
1437
1438 int acpi_bus_trim(struct acpi_device *start, int rmdevice)
1439 {
1440 acpi_status status;
1441 struct acpi_device *parent, *child;
1442 acpi_handle phandle, chandle;
1443 acpi_object_type type;
1444 u32 level = 1;
1445 int err = 0;
1446
1447 parent = start;
1448 phandle = start->handle;
1449 child = chandle = NULL;
1450
1451 while ((level > 0) && parent && (!err)) {
1452 status = acpi_get_next_object(ACPI_TYPE_ANY, phandle,
1453 chandle, &chandle);
1454
1455 /*
1456 * If this scope is exhausted then move our way back up.
1457 */
1458 if (ACPI_FAILURE(status)) {
1459 level--;
1460 chandle = phandle;
1461 acpi_get_parent(phandle, &phandle);
1462 child = parent;
1463 parent = parent->parent;
1464
1465 if (level == 0)
1466 err = acpi_bus_remove(child, rmdevice);
1467 else
1468 err = acpi_bus_remove(child, 1);
1469
1470 continue;
1471 }
1472
1473 status = acpi_get_type(chandle, &type);
1474 if (ACPI_FAILURE(status)) {
1475 continue;
1476 }
1477 /*
1478 * If there is a device corresponding to chandle then
1479 * parse it (depth-first).
1480 */
1481 if (acpi_bus_get_device(chandle, &child) == 0) {
1482 level++;
1483 phandle = chandle;
1484 chandle = NULL;
1485 parent = child;
1486 }
1487 continue;
1488 }
1489 return err;
1490 }
1491 EXPORT_SYMBOL_GPL(acpi_bus_trim);
1492
1493
1494 static int acpi_bus_scan_fixed(struct acpi_device *root)
1495 {
1496 int result = 0;
1497 struct acpi_device *device = NULL;
1498 struct acpi_bus_ops ops;
1499
1500 if (!root)
1501 return -ENODEV;
1502
1503 memset(&ops, 0, sizeof(ops));
1504 ops.acpi_op_add = 1;
1505 ops.acpi_op_start = 1;
1506
1507 /*
1508 * Enumerate all fixed-feature devices.
1509 */
1510 if ((acpi_gbl_FADT.flags & ACPI_FADT_POWER_BUTTON) == 0) {
1511 result = acpi_add_single_object(&device, acpi_root,
1512 NULL,
1513 ACPI_BUS_TYPE_POWER_BUTTON,
1514 &ops);
1515 }
1516
1517 if ((acpi_gbl_FADT.flags & ACPI_FADT_SLEEP_BUTTON) == 0) {
1518 result = acpi_add_single_object(&device, acpi_root,
1519 NULL,
1520 ACPI_BUS_TYPE_SLEEP_BUTTON,
1521 &ops);
1522 }
1523
1524 return result;
1525 }
1526
1527
1528 static int __init acpi_scan_init(void)
1529 {
1530 int result;
1531 struct acpi_bus_ops ops;
1532
1533
1534 if (acpi_disabled)
1535 return 0;
1536
1537 memset(&ops, 0, sizeof(ops));
1538 ops.acpi_op_add = 1;
1539 ops.acpi_op_start = 1;
1540
1541 result = bus_register(&acpi_bus_type);
1542 if (result) {
1543 /* We don't want to quit even if we failed to add suspend/resume */
1544 printk(KERN_ERR PREFIX "Could not register bus type\n");
1545 }
1546
1547 /*
1548 * Create the root device in the bus's device tree
1549 */
1550 result = acpi_add_single_object(&acpi_root, NULL, ACPI_ROOT_OBJECT,
1551 ACPI_BUS_TYPE_SYSTEM, &ops);
1552 if (result)
1553 goto Done;
1554
1555 /*
1556 * Enumerate devices in the ACPI namespace.
1557 */
1558 result = acpi_bus_scan_fixed(acpi_root);
1559
1560 if (!result)
1561 result = acpi_bus_scan(acpi_root, &ops);
1562
1563 if (result)
1564 acpi_device_unregister(acpi_root, ACPI_BUS_REMOVAL_NORMAL);
1565
1566 Done:
1567 return result;
1568 }
1569
1570 subsys_initcall(acpi_scan_init);
linux 2.6 git repository for openrd