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decnet: Use data ready call back, rather than hand coding it
[linux-2.6/verdex.git] / drivers / acpi / scan.c
blob8ff510b91d88f4f38e473afab76425a9cf392477
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 static LIST_HEAD(acpi_device_list);
26 static LIST_HEAD(acpi_bus_id_list);
27 DEFINE_MUTEX(acpi_device_lock);
28 LIST_HEAD(acpi_wakeup_device_list);
29
30 struct acpi_device_bus_id{
31 char bus_id[15];
32 unsigned int instance_no;
33 struct list_head node;
34 };
35
36 /*
37 * Creates hid/cid(s) string needed for modalias and uevent
38 * e.g. on a device with hid:IBM0001 and cid:ACPI0001 you get:
39 * char *modalias: "acpi:IBM0001:ACPI0001"
40 */
41 static int create_modalias(struct acpi_device *acpi_dev, char *modalias,
42 int size)
43 {
44 int len;
45 int count;
46
47 if (!acpi_dev->flags.hardware_id && !acpi_dev->flags.compatible_ids)
48 return -ENODEV;
49
50 len = snprintf(modalias, size, "acpi:");
51 size -= len;
52
53 if (acpi_dev->flags.hardware_id) {
54 count = snprintf(&modalias[len], size, "%s:",
55 acpi_dev->pnp.hardware_id);
56 if (count < 0 || count >= size)
57 return -EINVAL;
58 len += count;
59 size -= count;
60 }
61
62 if (acpi_dev->flags.compatible_ids) {
63 struct acpi_compatible_id_list *cid_list;
64 int i;
65
66 cid_list = acpi_dev->pnp.cid_list;
67 for (i = 0; i < cid_list->count; i++) {
68 count = snprintf(&modalias[len], size, "%s:",
69 cid_list->id[i].value);
70 if (count < 0 || count >= size) {
71 printk(KERN_ERR PREFIX "%s cid[%i] exceeds event buffer size",
72 acpi_dev->pnp.device_name, i);
73 break;
74 }
75 len += count;
76 size -= count;
77 }
78 }
79
80 modalias[len] = '\0';
81 return len;
82 }
83
84 static ssize_t
85 acpi_device_modalias_show(struct device *dev, struct device_attribute *attr, char *buf) {
86 struct acpi_device *acpi_dev = to_acpi_device(dev);
87 int len;
88
89 /* Device has no HID and no CID or string is >1024 */
90 len = create_modalias(acpi_dev, buf, 1024);
91 if (len <= 0)
92 return 0;
93 buf[len++] = '\n';
94 return len;
95 }
96 static DEVICE_ATTR(modalias, 0444, acpi_device_modalias_show, NULL);
97
98 static int acpi_bus_hot_remove_device(void *context)
99 {
100 struct acpi_device *device;
101 acpi_handle handle = context;
102 struct acpi_object_list arg_list;
103 union acpi_object arg;
104 acpi_status status = AE_OK;
105
106 if (acpi_bus_get_device(handle, &device))
107 return 0;
108
109 if (!device)
110 return 0;
111
112 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
113 "Hot-removing device %s...\n", dev_name(&device->dev)));
114
115 if (acpi_bus_trim(device, 1)) {
116 printk(KERN_ERR PREFIX
117 "Removing device failed\n");
118 return -1;
119 }
120
121 /* power off device */
122 status = acpi_evaluate_object(handle, "_PS3", NULL, NULL);
123 if (ACPI_FAILURE(status) && status != AE_NOT_FOUND)
124 printk(KERN_WARNING PREFIX
125 "Power-off device failed\n");
126
127 if (device->flags.lockable) {
128 arg_list.count = 1;
129 arg_list.pointer = &arg;
130 arg.type = ACPI_TYPE_INTEGER;
131 arg.integer.value = 0;
132 acpi_evaluate_object(handle, "_LCK", &arg_list, NULL);
133 }
134
135 arg_list.count = 1;
136 arg_list.pointer = &arg;
137 arg.type = ACPI_TYPE_INTEGER;
138 arg.integer.value = 1;
139
140 /*
141 * TBD: _EJD support.
142 */
143 status = acpi_evaluate_object(handle, "_EJ0", &arg_list, NULL);
144 if (ACPI_FAILURE(status))
145 return -ENODEV;
146
147 return 0;
148 }
149
150 static ssize_t
151 acpi_eject_store(struct device *d, struct device_attribute *attr,
152 const char *buf, size_t count)
153 {
154 int ret = count;
155 acpi_status status;
156 acpi_object_type type = 0;
157 struct acpi_device *acpi_device = to_acpi_device(d);
158 struct task_struct *task;
159
160 if ((!count) || (buf[0] != '1')) {
161 return -EINVAL;
162 }
163 #ifndef FORCE_EJECT
164 if (acpi_device->driver == NULL) {
165 ret = -ENODEV;
166 goto err;
167 }
168 #endif
169 status = acpi_get_type(acpi_device->handle, &type);
170 if (ACPI_FAILURE(status) || (!acpi_device->flags.ejectable)) {
171 ret = -ENODEV;
172 goto err;
173 }
174
175 /* remove the device in another thread to fix the deadlock issue */
176 task = kthread_run(acpi_bus_hot_remove_device,
177 acpi_device->handle, "acpi_hot_remove_device");
178 if (IS_ERR(task))
179 ret = PTR_ERR(task);
180 err:
181 return ret;
182 }
183
184 static DEVICE_ATTR(eject, 0200, NULL, acpi_eject_store);
185
186 static ssize_t
187 acpi_device_hid_show(struct device *dev, struct device_attribute *attr, char *buf) {
188 struct acpi_device *acpi_dev = to_acpi_device(dev);
189
190 return sprintf(buf, "%s\n", acpi_dev->pnp.hardware_id);
191 }
192 static DEVICE_ATTR(hid, 0444, acpi_device_hid_show, NULL);
193
194 static ssize_t
195 acpi_device_path_show(struct device *dev, struct device_attribute *attr, char *buf) {
196 struct acpi_device *acpi_dev = to_acpi_device(dev);
197 struct acpi_buffer path = {ACPI_ALLOCATE_BUFFER, NULL};
198 int result;
199
200 result = acpi_get_name(acpi_dev->handle, ACPI_FULL_PATHNAME, &path);
201 if(result)
202 goto end;
203
204 result = sprintf(buf, "%s\n", (char*)path.pointer);
205 kfree(path.pointer);
206 end:
207 return result;
208 }
209 static DEVICE_ATTR(path, 0444, acpi_device_path_show, NULL);
210
211 static int acpi_device_setup_files(struct acpi_device *dev)
212 {
213 acpi_status status;
214 acpi_handle temp;
215 int result = 0;
216
217 /*
218 * Devices gotten from FADT don't have a "path" attribute
219 */
220 if(dev->handle) {
221 result = device_create_file(&dev->dev, &dev_attr_path);
222 if(result)
223 goto end;
224 }
225
226 if(dev->flags.hardware_id) {
227 result = device_create_file(&dev->dev, &dev_attr_hid);
228 if(result)
229 goto end;
230 }
231
232 if (dev->flags.hardware_id || dev->flags.compatible_ids){
233 result = device_create_file(&dev->dev, &dev_attr_modalias);
234 if(result)
235 goto end;
236 }
237
238 /*
239 * If device has _EJ0, 'eject' file is created that is used to trigger
240 * hot-removal function from userland.
241 */
242 status = acpi_get_handle(dev->handle, "_EJ0", &temp);
243 if (ACPI_SUCCESS(status))
244 result = device_create_file(&dev->dev, &dev_attr_eject);
245 end:
246 return result;
247 }
248
249 static void acpi_device_remove_files(struct acpi_device *dev)
250 {
251 acpi_status status;
252 acpi_handle temp;
253
254 /*
255 * If device has _EJ0, 'eject' file is created that is used to trigger
256 * hot-removal function from userland.
257 */
258 status = acpi_get_handle(dev->handle, "_EJ0", &temp);
259 if (ACPI_SUCCESS(status))
260 device_remove_file(&dev->dev, &dev_attr_eject);
261
262 if (dev->flags.hardware_id || dev->flags.compatible_ids)
263 device_remove_file(&dev->dev, &dev_attr_modalias);
264
265 if(dev->flags.hardware_id)
266 device_remove_file(&dev->dev, &dev_attr_hid);
267 if(dev->handle)
268 device_remove_file(&dev->dev, &dev_attr_path);
269 }
270 /* --------------------------------------------------------------------------
271 ACPI Bus operations
272 -------------------------------------------------------------------------- */
273
274 int acpi_match_device_ids(struct acpi_device *device,
275 const struct acpi_device_id *ids)
276 {
277 const struct acpi_device_id *id;
278
279 /*
280 * If the device is not present, it is unnecessary to load device
281 * driver for it.
282 */
283 if (!device->status.present)
284 return -ENODEV;
285
286 if (device->flags.hardware_id) {
287 for (id = ids; id->id[0]; id++) {
288 if (!strcmp((char*)id->id, device->pnp.hardware_id))
289 return 0;
290 }
291 }
292
293 if (device->flags.compatible_ids) {
294 struct acpi_compatible_id_list *cid_list = device->pnp.cid_list;
295 int i;
296
297 for (id = ids; id->id[0]; id++) {
298 /* compare multiple _CID entries against driver ids */
299 for (i = 0; i < cid_list->count; i++) {
300 if (!strcmp((char*)id->id,
301 cid_list->id[i].value))
302 return 0;
303 }
304 }
305 }
306
307 return -ENOENT;
308 }
309 EXPORT_SYMBOL(acpi_match_device_ids);
310
311 static void acpi_device_release(struct device *dev)
312 {
313 struct acpi_device *acpi_dev = to_acpi_device(dev);
314
315 kfree(acpi_dev->pnp.cid_list);
316 kfree(acpi_dev);
317 }
318
319 static int acpi_device_suspend(struct device *dev, pm_message_t state)
320 {
321 struct acpi_device *acpi_dev = to_acpi_device(dev);
322 struct acpi_driver *acpi_drv = acpi_dev->driver;
323
324 if (acpi_drv && acpi_drv->ops.suspend)
325 return acpi_drv->ops.suspend(acpi_dev, state);
326 return 0;
327 }
328
329 static int acpi_device_resume(struct device *dev)
330 {
331 struct acpi_device *acpi_dev = to_acpi_device(dev);
332 struct acpi_driver *acpi_drv = acpi_dev->driver;
333
334 if (acpi_drv && acpi_drv->ops.resume)
335 return acpi_drv->ops.resume(acpi_dev);
336 return 0;
337 }
338
339 static int acpi_bus_match(struct device *dev, struct device_driver *drv)
340 {
341 struct acpi_device *acpi_dev = to_acpi_device(dev);
342 struct acpi_driver *acpi_drv = to_acpi_driver(drv);
343
344 return !acpi_match_device_ids(acpi_dev, acpi_drv->ids);
345 }
346
347 static int acpi_device_uevent(struct device *dev, struct kobj_uevent_env *env)
348 {
349 struct acpi_device *acpi_dev = to_acpi_device(dev);
350 int len;
351
352 if (add_uevent_var(env, "MODALIAS="))
353 return -ENOMEM;
354 len = create_modalias(acpi_dev, &env->buf[env->buflen - 1],
355 sizeof(env->buf) - env->buflen);
356 if (len >= (sizeof(env->buf) - env->buflen))
357 return -ENOMEM;
358 env->buflen += len;
359 return 0;
360 }
361
362 static void acpi_device_notify(acpi_handle handle, u32 event, void *data)
363 {
364 struct acpi_device *device = data;
365
366 device->driver->ops.notify(device, event);
367 }
368
369 static acpi_status acpi_device_notify_fixed(void *data)
370 {
371 struct acpi_device *device = data;
372
373 acpi_device_notify(device->handle, ACPI_FIXED_HARDWARE_EVENT, device);
374 return AE_OK;
375 }
376
377 static int acpi_device_install_notify_handler(struct acpi_device *device)
378 {
379 acpi_status status;
380 char *hid;
381
382 hid = acpi_device_hid(device);
383 if (!strcmp(hid, ACPI_BUTTON_HID_POWERF))
384 status =
385 acpi_install_fixed_event_handler(ACPI_EVENT_POWER_BUTTON,
386 acpi_device_notify_fixed,
387 device);
388 else if (!strcmp(hid, ACPI_BUTTON_HID_SLEEPF))
389 status =
390 acpi_install_fixed_event_handler(ACPI_EVENT_SLEEP_BUTTON,
391 acpi_device_notify_fixed,
392 device);
393 else
394 status = acpi_install_notify_handler(device->handle,
395 ACPI_DEVICE_NOTIFY,
396 acpi_device_notify,
397 device);
398
399 if (ACPI_FAILURE(status))
400 return -EINVAL;
401 return 0;
402 }
403
404 static void acpi_device_remove_notify_handler(struct acpi_device *device)
405 {
406 if (!strcmp(acpi_device_hid(device), ACPI_BUTTON_HID_POWERF))
407 acpi_remove_fixed_event_handler(ACPI_EVENT_POWER_BUTTON,
408 acpi_device_notify_fixed);
409 else if (!strcmp(acpi_device_hid(device), ACPI_BUTTON_HID_SLEEPF))
410 acpi_remove_fixed_event_handler(ACPI_EVENT_SLEEP_BUTTON,
411 acpi_device_notify_fixed);
412 else
413 acpi_remove_notify_handler(device->handle, ACPI_DEVICE_NOTIFY,
414 acpi_device_notify);
415 }
416
417 static int acpi_bus_driver_init(struct acpi_device *, struct acpi_driver *);
418 static int acpi_start_single_object(struct acpi_device *);
419 static int acpi_device_probe(struct device * dev)
420 {
421 struct acpi_device *acpi_dev = to_acpi_device(dev);
422 struct acpi_driver *acpi_drv = to_acpi_driver(dev->driver);
423 int ret;
424
425 ret = acpi_bus_driver_init(acpi_dev, acpi_drv);
426 if (!ret) {
427 if (acpi_dev->bus_ops.acpi_op_start)
428 acpi_start_single_object(acpi_dev);
429
430 if (acpi_drv->ops.notify) {
431 ret = acpi_device_install_notify_handler(acpi_dev);
432 if (ret) {
433 if (acpi_drv->ops.stop)
434 acpi_drv->ops.stop(acpi_dev,
435 acpi_dev->removal_type);
436 if (acpi_drv->ops.remove)
437 acpi_drv->ops.remove(acpi_dev,
438 acpi_dev->removal_type);
439 return ret;
440 }
441 }
442
443 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
444 "Found driver [%s] for device [%s]\n",
445 acpi_drv->name, acpi_dev->pnp.bus_id));
446 get_device(dev);
447 }
448 return ret;
449 }
450
451 static int acpi_device_remove(struct device * dev)
452 {
453 struct acpi_device *acpi_dev = to_acpi_device(dev);
454 struct acpi_driver *acpi_drv = acpi_dev->driver;
455
456 if (acpi_drv) {
457 if (acpi_drv->ops.notify)
458 acpi_device_remove_notify_handler(acpi_dev);
459 if (acpi_drv->ops.stop)
460 acpi_drv->ops.stop(acpi_dev, acpi_dev->removal_type);
461 if (acpi_drv->ops.remove)
462 acpi_drv->ops.remove(acpi_dev, acpi_dev->removal_type);
463 }
464 acpi_dev->driver = NULL;
465 acpi_dev->driver_data = NULL;
466
467 put_device(dev);
468 return 0;
469 }
470
471 struct bus_type acpi_bus_type = {
472 .name = "acpi",
473 .suspend = acpi_device_suspend,
474 .resume = acpi_device_resume,
475 .match = acpi_bus_match,
476 .probe = acpi_device_probe,
477 .remove = acpi_device_remove,
478 .uevent = acpi_device_uevent,
479 };
480
481 static int acpi_device_register(struct acpi_device *device,
482 struct acpi_device *parent)
483 {
484 int result;
485 struct acpi_device_bus_id *acpi_device_bus_id, *new_bus_id;
486 int found = 0;
487 /*
488 * Linkage
489 * -------
490 * Link this device to its parent and siblings.
491 */
492 INIT_LIST_HEAD(&device->children);
493 INIT_LIST_HEAD(&device->node);
494 INIT_LIST_HEAD(&device->wakeup_list);
495
496 new_bus_id = kzalloc(sizeof(struct acpi_device_bus_id), GFP_KERNEL);
497 if (!new_bus_id) {
498 printk(KERN_ERR PREFIX "Memory allocation error\n");
499 return -ENOMEM;
500 }
501
502 mutex_lock(&acpi_device_lock);
503 /*
504 * Find suitable bus_id and instance number in acpi_bus_id_list
505 * If failed, create one and link it into acpi_bus_id_list
506 */
507 list_for_each_entry(acpi_device_bus_id, &acpi_bus_id_list, node) {
508 if(!strcmp(acpi_device_bus_id->bus_id, device->flags.hardware_id? device->pnp.hardware_id : "device")) {
509 acpi_device_bus_id->instance_no ++;
510 found = 1;
511 kfree(new_bus_id);
512 break;
513 }
514 }
515 if(!found) {
516 acpi_device_bus_id = new_bus_id;
517 strcpy(acpi_device_bus_id->bus_id, device->flags.hardware_id ? device->pnp.hardware_id : "device");
518 acpi_device_bus_id->instance_no = 0;
519 list_add_tail(&acpi_device_bus_id->node, &acpi_bus_id_list);
520 }
521 dev_set_name(&device->dev, "%s:%02x", acpi_device_bus_id->bus_id, acpi_device_bus_id->instance_no);
522
523 if (device->parent)
524 list_add_tail(&device->node, &device->parent->children);
525
526 if (device->wakeup.flags.valid)
527 list_add_tail(&device->wakeup_list, &acpi_wakeup_device_list);
528 mutex_unlock(&acpi_device_lock);
529
530 if (device->parent)
531 device->dev.parent = &parent->dev;
532 device->dev.bus = &acpi_bus_type;
533 device_initialize(&device->dev);
534 device->dev.release = &acpi_device_release;
535 result = device_add(&device->dev);
536 if(result) {
537 dev_err(&device->dev, "Error adding device\n");
538 goto end;
539 }
540
541 result = acpi_device_setup_files(device);
542 if(result)
543 printk(KERN_ERR PREFIX "Error creating sysfs interface for device %s\n",
544 dev_name(&device->dev));
545
546 device->removal_type = ACPI_BUS_REMOVAL_NORMAL;
547 return 0;
548 end:
549 mutex_lock(&acpi_device_lock);
550 if (device->parent)
551 list_del(&device->node);
552 list_del(&device->wakeup_list);
553 mutex_unlock(&acpi_device_lock);
554 return result;
555 }
556
557 static void acpi_device_unregister(struct acpi_device *device, int type)
558 {
559 mutex_lock(&acpi_device_lock);
560 if (device->parent)
561 list_del(&device->node);
562
563 list_del(&device->wakeup_list);
564 mutex_unlock(&acpi_device_lock);
565
566 acpi_detach_data(device->handle, acpi_bus_data_handler);
567
568 acpi_device_remove_files(device);
569 device_unregister(&device->dev);
570 }
571
572 /* --------------------------------------------------------------------------
573 Driver Management
574 -------------------------------------------------------------------------- */
575 /**
576 * acpi_bus_driver_init - add a device to a driver
577 * @device: the device to add and initialize
578 * @driver: driver for the device
579 *
580 * Used to initialize a device via its device driver. Called whenever a
581 * driver is bound to a device. Invokes the driver's add() ops.
582 */
583 static int
584 acpi_bus_driver_init(struct acpi_device *device, struct acpi_driver *driver)
585 {
586 int result = 0;
587
588
589 if (!device || !driver)
590 return -EINVAL;
591
592 if (!driver->ops.add)
593 return -ENOSYS;
594
595 result = driver->ops.add(device);
596 if (result) {
597 device->driver = NULL;
598 device->driver_data = NULL;
599 return result;
600 }
601
602 device->driver = driver;
603
604 /*
605 * TBD - Configuration Management: Assign resources to device based
606 * upon possible configuration and currently allocated resources.
607 */
608
609 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
610 "Driver successfully bound to device\n"));
611 return 0;
612 }
613
614 static int acpi_start_single_object(struct acpi_device *device)
615 {
616 int result = 0;
617 struct acpi_driver *driver;
618
619
620 if (!(driver = device->driver))
621 return 0;
622
623 if (driver->ops.start) {
624 result = driver->ops.start(device);
625 if (result && driver->ops.remove)
626 driver->ops.remove(device, ACPI_BUS_REMOVAL_NORMAL);
627 }
628
629 return result;
630 }
631
632 /**
633 * acpi_bus_register_driver - register a driver with the ACPI bus
634 * @driver: driver being registered
635 *
636 * Registers a driver with the ACPI bus. Searches the namespace for all
637 * devices that match the driver's criteria and binds. Returns zero for
638 * success or a negative error status for failure.
639 */
640 int acpi_bus_register_driver(struct acpi_driver *driver)
641 {
642 int ret;
643
644 if (acpi_disabled)
645 return -ENODEV;
646 driver->drv.name = driver->name;
647 driver->drv.bus = &acpi_bus_type;
648 driver->drv.owner = driver->owner;
649
650 ret = driver_register(&driver->drv);
651 return ret;
652 }
653
654 EXPORT_SYMBOL(acpi_bus_register_driver);
655
656 /**
657 * acpi_bus_unregister_driver - unregisters a driver with the APIC bus
658 * @driver: driver to unregister
659 *
660 * Unregisters a driver with the ACPI bus. Searches the namespace for all
661 * devices that match the driver's criteria and unbinds.
662 */
663 void acpi_bus_unregister_driver(struct acpi_driver *driver)
664 {
665 driver_unregister(&driver->drv);
666 }
667
668 EXPORT_SYMBOL(acpi_bus_unregister_driver);
669
670 /* --------------------------------------------------------------------------
671 Device Enumeration
672 -------------------------------------------------------------------------- */
673 acpi_status
674 acpi_bus_get_ejd(acpi_handle handle, acpi_handle *ejd)
675 {
676 acpi_status status;
677 acpi_handle tmp;
678 struct acpi_buffer buffer = {ACPI_ALLOCATE_BUFFER, NULL};
679 union acpi_object *obj;
680
681 status = acpi_get_handle(handle, "_EJD", &tmp);
682 if (ACPI_FAILURE(status))
683 return status;
684
685 status = acpi_evaluate_object(handle, "_EJD", NULL, &buffer);
686 if (ACPI_SUCCESS(status)) {
687 obj = buffer.pointer;
688 status = acpi_get_handle(ACPI_ROOT_OBJECT, obj->string.pointer,
689 ejd);
690 kfree(buffer.pointer);
691 }
692 return status;
693 }
694 EXPORT_SYMBOL_GPL(acpi_bus_get_ejd);
695
696 void acpi_bus_data_handler(acpi_handle handle, u32 function, void *context)
697 {
698
699 /* TBD */
700
701 return;
702 }
703
704 static int acpi_bus_get_perf_flags(struct acpi_device *device)
705 {
706 device->performance.state = ACPI_STATE_UNKNOWN;
707 return 0;
708 }
709
710 static acpi_status
711 acpi_bus_extract_wakeup_device_power_package(struct acpi_device *device,
712 union acpi_object *package)
713 {
714 int i = 0;
715 union acpi_object *element = NULL;
716
717 if (!device || !package || (package->package.count < 2))
718 return AE_BAD_PARAMETER;
719
720 element = &(package->package.elements[0]);
721 if (!element)
722 return AE_BAD_PARAMETER;
723 if (element->type == ACPI_TYPE_PACKAGE) {
724 if ((element->package.count < 2) ||
725 (element->package.elements[0].type !=
726 ACPI_TYPE_LOCAL_REFERENCE)
727 || (element->package.elements[1].type != ACPI_TYPE_INTEGER))
728 return AE_BAD_DATA;
729 device->wakeup.gpe_device =
730 element->package.elements[0].reference.handle;
731 device->wakeup.gpe_number =
732 (u32) element->package.elements[1].integer.value;
733 } else if (element->type == ACPI_TYPE_INTEGER) {
734 device->wakeup.gpe_number = element->integer.value;
735 } else
736 return AE_BAD_DATA;
737
738 element = &(package->package.elements[1]);
739 if (element->type != ACPI_TYPE_INTEGER) {
740 return AE_BAD_DATA;
741 }
742 device->wakeup.sleep_state = element->integer.value;
743
744 if ((package->package.count - 2) > ACPI_MAX_HANDLES) {
745 return AE_NO_MEMORY;
746 }
747 device->wakeup.resources.count = package->package.count - 2;
748 for (i = 0; i < device->wakeup.resources.count; i++) {
749 element = &(package->package.elements[i + 2]);
750 if (element->type != ACPI_TYPE_LOCAL_REFERENCE)
751 return AE_BAD_DATA;
752
753 device->wakeup.resources.handles[i] = element->reference.handle;
754 }
755
756 return AE_OK;
757 }
758
759 static int acpi_bus_get_wakeup_device_flags(struct acpi_device *device)
760 {
761 acpi_status status = 0;
762 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
763 union acpi_object *package = NULL;
764 int psw_error;
765
766 struct acpi_device_id button_device_ids[] = {
767 {"PNP0C0D", 0},
768 {"PNP0C0C", 0},
769 {"PNP0C0E", 0},
770 {"", 0},
771 };
772
773 /* _PRW */
774 status = acpi_evaluate_object(device->handle, "_PRW", NULL, &buffer);
775 if (ACPI_FAILURE(status)) {
776 ACPI_EXCEPTION((AE_INFO, status, "Evaluating _PRW"));
777 goto end;
778 }
779
780 package = (union acpi_object *)buffer.pointer;
781 status = acpi_bus_extract_wakeup_device_power_package(device, package);
782 if (ACPI_FAILURE(status)) {
783 ACPI_EXCEPTION((AE_INFO, status, "Extracting _PRW package"));
784 goto end;
785 }
786
787 kfree(buffer.pointer);
788
789 device->wakeup.flags.valid = 1;
790 /* Call _PSW/_DSW object to disable its ability to wake the sleeping
791 * system for the ACPI device with the _PRW object.
792 * The _PSW object is depreciated in ACPI 3.0 and is replaced by _DSW.
793 * So it is necessary to call _DSW object first. Only when it is not
794 * present will the _PSW object used.
795 */
796 psw_error = acpi_device_sleep_wake(device, 0, 0, 0);
797 if (psw_error)
798 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
799 "error in _DSW or _PSW evaluation\n"));
800
801 /* Power button, Lid switch always enable wakeup */
802 if (!acpi_match_device_ids(device, button_device_ids))
803 device->wakeup.flags.run_wake = 1;
804
805 end:
806 if (ACPI_FAILURE(status))
807 device->flags.wake_capable = 0;
808 return 0;
809 }
810
811 static int acpi_bus_get_power_flags(struct acpi_device *device)
812 {
813 acpi_status status = 0;
814 acpi_handle handle = NULL;
815 u32 i = 0;
816
817
818 /*
819 * Power Management Flags
820 */
821 status = acpi_get_handle(device->handle, "_PSC", &handle);
822 if (ACPI_SUCCESS(status))
823 device->power.flags.explicit_get = 1;
824 status = acpi_get_handle(device->handle, "_IRC", &handle);
825 if (ACPI_SUCCESS(status))
826 device->power.flags.inrush_current = 1;
827
828 /*
829 * Enumerate supported power management states
830 */
831 for (i = ACPI_STATE_D0; i <= ACPI_STATE_D3; i++) {
832 struct acpi_device_power_state *ps = &device->power.states[i];
833 char object_name[5] = { '_', 'P', 'R', '0' + i, '\0' };
834
835 /* Evaluate "_PRx" to se if power resources are referenced */
836 acpi_evaluate_reference(device->handle, object_name, NULL,
837 &ps->resources);
838 if (ps->resources.count) {
839 device->power.flags.power_resources = 1;
840 ps->flags.valid = 1;
841 }
842
843 /* Evaluate "_PSx" to see if we can do explicit sets */
844 object_name[2] = 'S';
845 status = acpi_get_handle(device->handle, object_name, &handle);
846 if (ACPI_SUCCESS(status)) {
847 ps->flags.explicit_set = 1;
848 ps->flags.valid = 1;
849 }
850
851 /* State is valid if we have some power control */
852 if (ps->resources.count || ps->flags.explicit_set)
853 ps->flags.valid = 1;
854
855 ps->power = -1; /* Unknown - driver assigned */
856 ps->latency = -1; /* Unknown - driver assigned */
857 }
858
859 /* Set defaults for D0 and D3 states (always valid) */
860 device->power.states[ACPI_STATE_D0].flags.valid = 1;
861 device->power.states[ACPI_STATE_D0].power = 100;
862 device->power.states[ACPI_STATE_D3].flags.valid = 1;
863 device->power.states[ACPI_STATE_D3].power = 0;
864
865 /* TBD: System wake support and resource requirements. */
866
867 device->power.state = ACPI_STATE_UNKNOWN;
868 acpi_bus_get_power(device->handle, &(device->power.state));
869
870 return 0;
871 }
872
873 static int acpi_bus_get_flags(struct acpi_device *device)
874 {
875 acpi_status status = AE_OK;
876 acpi_handle temp = NULL;
877
878
879 /* Presence of _STA indicates 'dynamic_status' */
880 status = acpi_get_handle(device->handle, "_STA", &temp);
881 if (ACPI_SUCCESS(status))
882 device->flags.dynamic_status = 1;
883
884 /* Presence of _CID indicates 'compatible_ids' */
885 status = acpi_get_handle(device->handle, "_CID", &temp);
886 if (ACPI_SUCCESS(status))
887 device->flags.compatible_ids = 1;
888
889 /* Presence of _RMV indicates 'removable' */
890 status = acpi_get_handle(device->handle, "_RMV", &temp);
891 if (ACPI_SUCCESS(status))
892 device->flags.removable = 1;
893
894 /* Presence of _EJD|_EJ0 indicates 'ejectable' */
895 status = acpi_get_handle(device->handle, "_EJD", &temp);
896 if (ACPI_SUCCESS(status))
897 device->flags.ejectable = 1;
898 else {
899 status = acpi_get_handle(device->handle, "_EJ0", &temp);
900 if (ACPI_SUCCESS(status))
901 device->flags.ejectable = 1;
902 }
903
904 /* Presence of _LCK indicates 'lockable' */
905 status = acpi_get_handle(device->handle, "_LCK", &temp);
906 if (ACPI_SUCCESS(status))
907 device->flags.lockable = 1;
908
909 /* Presence of _PS0|_PR0 indicates 'power manageable' */
910 status = acpi_get_handle(device->handle, "_PS0", &temp);
911 if (ACPI_FAILURE(status))
912 status = acpi_get_handle(device->handle, "_PR0", &temp);
913 if (ACPI_SUCCESS(status))
914 device->flags.power_manageable = 1;
915
916 /* Presence of _PRW indicates wake capable */
917 status = acpi_get_handle(device->handle, "_PRW", &temp);
918 if (ACPI_SUCCESS(status))
919 device->flags.wake_capable = 1;
920
921 /* TBD: Performance management */
922
923 return 0;
924 }
925
926 static void acpi_device_get_busid(struct acpi_device *device,
927 acpi_handle handle, int type)
928 {
929 char bus_id[5] = { '?', 0 };
930 struct acpi_buffer buffer = { sizeof(bus_id), bus_id };
931 int i = 0;
932
933 /*
934 * Bus ID
935 * ------
936 * The device's Bus ID is simply the object name.
937 * TBD: Shouldn't this value be unique (within the ACPI namespace)?
938 */
939 switch (type) {
940 case ACPI_BUS_TYPE_SYSTEM:
941 strcpy(device->pnp.bus_id, "ACPI");
942 break;
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(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 static void acpi_device_set_id(struct acpi_device *device,
1009 struct acpi_device *parent, acpi_handle handle,
1010 int type)
1011 {
1012 struct acpi_device_info *info;
1013 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
1014 char *hid = NULL;
1015 char *uid = NULL;
1016 struct acpi_compatible_id_list *cid_list = NULL;
1017 const char *cid_add = NULL;
1018 acpi_status status;
1019
1020 switch (type) {
1021 case ACPI_BUS_TYPE_DEVICE:
1022 status = acpi_get_object_info(handle, &buffer);
1023 if (ACPI_FAILURE(status)) {
1024 printk(KERN_ERR PREFIX "%s: Error reading device info\n", __func__);
1025 return;
1026 }
1027
1028 info = buffer.pointer;
1029 if (info->valid & ACPI_VALID_HID)
1030 hid = info->hardware_id.value;
1031 if (info->valid & ACPI_VALID_UID)
1032 uid = info->unique_id.value;
1033 if (info->valid & ACPI_VALID_CID)
1034 cid_list = &info->compatibility_id;
1035 if (info->valid & ACPI_VALID_ADR) {
1036 device->pnp.bus_address = info->address;
1037 device->flags.bus_address = 1;
1038 }
1039
1040 /* If we have a video/bay/dock device, add our selfdefined
1041 HID to the CID list. Like that the video/bay/dock drivers
1042 will get autoloaded and the device might still match
1043 against another driver.
1044 */
1045 if (acpi_is_video_device(device))
1046 cid_add = ACPI_VIDEO_HID;
1047 else if (ACPI_SUCCESS(acpi_bay_match(device)))
1048 cid_add = ACPI_BAY_HID;
1049 else if (ACPI_SUCCESS(acpi_dock_match(device)))
1050 cid_add = ACPI_DOCK_HID;
1051
1052 break;
1053 case ACPI_BUS_TYPE_POWER:
1054 hid = ACPI_POWER_HID;
1055 break;
1056 case ACPI_BUS_TYPE_PROCESSOR:
1057 hid = ACPI_PROCESSOR_OBJECT_HID;
1058 break;
1059 case ACPI_BUS_TYPE_SYSTEM:
1060 hid = ACPI_SYSTEM_HID;
1061 break;
1062 case ACPI_BUS_TYPE_THERMAL:
1063 hid = ACPI_THERMAL_HID;
1064 break;
1065 case ACPI_BUS_TYPE_POWER_BUTTON:
1066 hid = ACPI_BUTTON_HID_POWERF;
1067 break;
1068 case ACPI_BUS_TYPE_SLEEP_BUTTON:
1069 hid = ACPI_BUTTON_HID_SLEEPF;
1070 break;
1071 }
1072
1073 /*
1074 * \_SB
1075 * ----
1076 * Fix for the system root bus device -- the only root-level device.
1077 */
1078 if (((acpi_handle)parent == ACPI_ROOT_OBJECT) && (type == ACPI_BUS_TYPE_DEVICE)) {
1079 hid = ACPI_BUS_HID;
1080 strcpy(device->pnp.device_name, ACPI_BUS_DEVICE_NAME);
1081 strcpy(device->pnp.device_class, ACPI_BUS_CLASS);
1082 }
1083
1084 if (hid) {
1085 strcpy(device->pnp.hardware_id, hid);
1086 device->flags.hardware_id = 1;
1087 }
1088 if (uid) {
1089 strcpy(device->pnp.unique_id, uid);
1090 device->flags.unique_id = 1;
1091 }
1092 if (cid_list || cid_add) {
1093 struct acpi_compatible_id_list *list;
1094 int size = 0;
1095 int count = 0;
1096
1097 if (cid_list) {
1098 size = cid_list->size;
1099 } else if (cid_add) {
1100 size = sizeof(struct acpi_compatible_id_list);
1101 cid_list = ACPI_ALLOCATE_ZEROED((acpi_size) size);
1102 if (!cid_list) {
1103 printk(KERN_ERR "Memory allocation error\n");
1104 kfree(buffer.pointer);
1105 return;
1106 } else {
1107 cid_list->count = 0;
1108 cid_list->size = size;
1109 }
1110 }
1111 if (cid_add)
1112 size += sizeof(struct acpi_compatible_id);
1113 list = kmalloc(size, GFP_KERNEL);
1114
1115 if (list) {
1116 if (cid_list) {
1117 memcpy(list, cid_list, cid_list->size);
1118 count = cid_list->count;
1119 }
1120 if (cid_add) {
1121 strncpy(list->id[count].value, cid_add,
1122 ACPI_MAX_CID_LENGTH);
1123 count++;
1124 device->flags.compatible_ids = 1;
1125 }
1126 list->size = size;
1127 list->count = count;
1128 device->pnp.cid_list = list;
1129 } else
1130 printk(KERN_ERR PREFIX "Memory allocation error\n");
1131 }
1132
1133 kfree(buffer.pointer);
1134 }
1135
1136 static int acpi_device_set_context(struct acpi_device *device, int type)
1137 {
1138 acpi_status status = AE_OK;
1139 int result = 0;
1140 /*
1141 * Context
1142 * -------
1143 * Attach this 'struct acpi_device' to the ACPI object. This makes
1144 * resolutions from handle->device very efficient. Note that we need
1145 * to be careful with fixed-feature devices as they all attach to the
1146 * root object.
1147 */
1148 if (type != ACPI_BUS_TYPE_POWER_BUTTON &&
1149 type != ACPI_BUS_TYPE_SLEEP_BUTTON) {
1150 status = acpi_attach_data(device->handle,
1151 acpi_bus_data_handler, device);
1152
1153 if (ACPI_FAILURE(status)) {
1154 printk(KERN_ERR PREFIX "Error attaching device data\n");
1155 result = -ENODEV;
1156 }
1157 }
1158 return result;
1159 }
1160
1161 static int acpi_bus_remove(struct acpi_device *dev, int rmdevice)
1162 {
1163 if (!dev)
1164 return -EINVAL;
1165
1166 dev->removal_type = ACPI_BUS_REMOVAL_EJECT;
1167 device_release_driver(&dev->dev);
1168
1169 if (!rmdevice)
1170 return 0;
1171
1172 /*
1173 * unbind _ADR-Based Devices when hot removal
1174 */
1175 if (dev->flags.bus_address) {
1176 if ((dev->parent) && (dev->parent->ops.unbind))
1177 dev->parent->ops.unbind(dev);
1178 }
1179 acpi_device_unregister(dev, ACPI_BUS_REMOVAL_EJECT);
1180
1181 return 0;
1182 }
1183
1184 static int
1185 acpi_add_single_object(struct acpi_device **child,
1186 struct acpi_device *parent, acpi_handle handle, int type,
1187 struct acpi_bus_ops *ops)
1188 {
1189 int result = 0;
1190 struct acpi_device *device = NULL;
1191
1192
1193 if (!child)
1194 return -EINVAL;
1195
1196 device = kzalloc(sizeof(struct acpi_device), GFP_KERNEL);
1197 if (!device) {
1198 printk(KERN_ERR PREFIX "Memory allocation error\n");
1199 return -ENOMEM;
1200 }
1201
1202 device->handle = handle;
1203 device->parent = parent;
1204 device->bus_ops = *ops; /* workround for not call .start */
1205
1206
1207 acpi_device_get_busid(device, handle, type);
1208
1209 /*
1210 * Flags
1211 * -----
1212 * Get prior to calling acpi_bus_get_status() so we know whether
1213 * or not _STA is present. Note that we only look for object
1214 * handles -- cannot evaluate objects until we know the device is
1215 * present and properly initialized.
1216 */
1217 result = acpi_bus_get_flags(device);
1218 if (result)
1219 goto end;
1220
1221 /*
1222 * Status
1223 * ------
1224 * See if the device is present. We always assume that non-Device
1225 * and non-Processor objects (e.g. thermal zones, power resources,
1226 * etc.) are present, functioning, etc. (at least when parent object
1227 * is present). Note that _STA has a different meaning for some
1228 * objects (e.g. power resources) so we need to be careful how we use
1229 * it.
1230 */
1231 switch (type) {
1232 case ACPI_BUS_TYPE_PROCESSOR:
1233 case ACPI_BUS_TYPE_DEVICE:
1234 result = acpi_bus_get_status(device);
1235 if (ACPI_FAILURE(result)) {
1236 result = -ENODEV;
1237 goto end;
1238 }
1239 /*
1240 * When the device is neither present nor functional, the
1241 * device should not be added to Linux ACPI device tree.
1242 * When the status of the device is not present but functinal,
1243 * it should be added to Linux ACPI tree. For example : bay
1244 * device , dock device.
1245 * In such conditions it is unncessary to check whether it is
1246 * bay device or dock device.
1247 */
1248 if (!device->status.present && !device->status.functional) {
1249 result = -ENODEV;
1250 goto end;
1251 }
1252 break;
1253 default:
1254 STRUCT_TO_INT(device->status) =
1255 ACPI_STA_DEVICE_PRESENT | ACPI_STA_DEVICE_ENABLED |
1256 ACPI_STA_DEVICE_UI | ACPI_STA_DEVICE_FUNCTIONING;
1257 break;
1258 }
1259
1260 /*
1261 * Initialize Device
1262 * -----------------
1263 * TBD: Synch with Core's enumeration/initialization process.
1264 */
1265
1266 /*
1267 * Hardware ID, Unique ID, & Bus Address
1268 * -------------------------------------
1269 */
1270 acpi_device_set_id(device, parent, handle, type);
1271
1272 /*
1273 * The ACPI device is attached to acpi handle before getting
1274 * the power/wakeup/peformance flags. Otherwise OS can't get
1275 * the corresponding ACPI device by the acpi handle in the course
1276 * of getting the power/wakeup/performance flags.
1277 */
1278 result = acpi_device_set_context(device, type);
1279 if (result)
1280 goto end;
1281
1282 /*
1283 * Power Management
1284 * ----------------
1285 */
1286 if (device->flags.power_manageable) {
1287 result = acpi_bus_get_power_flags(device);
1288 if (result)
1289 goto end;
1290 }
1291
1292 /*
1293 * Wakeup device management
1294 *-----------------------
1295 */
1296 if (device->flags.wake_capable) {
1297 result = acpi_bus_get_wakeup_device_flags(device);
1298 if (result)
1299 goto end;
1300 }
1301
1302 /*
1303 * Performance Management
1304 * ----------------------
1305 */
1306 if (device->flags.performance_manageable) {
1307 result = acpi_bus_get_perf_flags(device);
1308 if (result)
1309 goto end;
1310 }
1311
1312
1313 result = acpi_device_register(device, parent);
1314
1315 /*
1316 * Bind _ADR-Based Devices when hot add
1317 */
1318 if (device->flags.bus_address) {
1319 if (device->parent && device->parent->ops.bind)
1320 device->parent->ops.bind(device);
1321 }
1322
1323 end:
1324 if (!result)
1325 *child = device;
1326 else {
1327 kfree(device->pnp.cid_list);
1328 kfree(device);
1329 }
1330
1331 return result;
1332 }
1333
1334 static int acpi_bus_scan(struct acpi_device *start, struct acpi_bus_ops *ops)
1335 {
1336 acpi_status status = AE_OK;
1337 struct acpi_device *parent = NULL;
1338 struct acpi_device *child = NULL;
1339 acpi_handle phandle = NULL;
1340 acpi_handle chandle = NULL;
1341 acpi_object_type type = 0;
1342 u32 level = 1;
1343
1344
1345 if (!start)
1346 return -EINVAL;
1347
1348 parent = start;
1349 phandle = start->handle;
1350
1351 /*
1352 * Parse through the ACPI namespace, identify all 'devices', and
1353 * create a new 'struct acpi_device' for each.
1354 */
1355 while ((level > 0) && parent) {
1356
1357 status = acpi_get_next_object(ACPI_TYPE_ANY, phandle,
1358 chandle, &chandle);
1359
1360 /*
1361 * If this scope is exhausted then move our way back up.
1362 */
1363 if (ACPI_FAILURE(status)) {
1364 level--;
1365 chandle = phandle;
1366 acpi_get_parent(phandle, &phandle);
1367 if (parent->parent)
1368 parent = parent->parent;
1369 continue;
1370 }
1371
1372 status = acpi_get_type(chandle, &type);
1373 if (ACPI_FAILURE(status))
1374 continue;
1375
1376 /*
1377 * If this is a scope object then parse it (depth-first).
1378 */
1379 if (type == ACPI_TYPE_LOCAL_SCOPE) {
1380 level++;
1381 phandle = chandle;
1382 chandle = NULL;
1383 continue;
1384 }
1385
1386 /*
1387 * We're only interested in objects that we consider 'devices'.
1388 */
1389 switch (type) {
1390 case ACPI_TYPE_DEVICE:
1391 type = ACPI_BUS_TYPE_DEVICE;
1392 break;
1393 case ACPI_TYPE_PROCESSOR:
1394 type = ACPI_BUS_TYPE_PROCESSOR;
1395 break;
1396 case ACPI_TYPE_THERMAL:
1397 type = ACPI_BUS_TYPE_THERMAL;
1398 break;
1399 case ACPI_TYPE_POWER:
1400 type = ACPI_BUS_TYPE_POWER;
1401 break;
1402 default:
1403 continue;
1404 }
1405
1406 if (ops->acpi_op_add)
1407 status = acpi_add_single_object(&child, parent,
1408 chandle, type, ops);
1409 else
1410 status = acpi_bus_get_device(chandle, &child);
1411
1412 if (ACPI_FAILURE(status))
1413 continue;
1414
1415 if (ops->acpi_op_start && !(ops->acpi_op_add)) {
1416 status = acpi_start_single_object(child);
1417 if (ACPI_FAILURE(status))
1418 continue;
1419 }
1420
1421 /*
1422 * If the device is present, enabled, and functioning then
1423 * parse its scope (depth-first). Note that we need to
1424 * represent absent devices to facilitate PnP notifications
1425 * -- but only the subtree head (not all of its children,
1426 * which will be enumerated when the parent is inserted).
1427 *
1428 * TBD: Need notifications and other detection mechanisms
1429 * in place before we can fully implement this.
1430 */
1431 /*
1432 * When the device is not present but functional, it is also
1433 * necessary to scan the children of this device.
1434 */
1435 if (child->status.present || (!child->status.present &&
1436 child->status.functional)) {
1437 status = acpi_get_next_object(ACPI_TYPE_ANY, chandle,
1438 NULL, NULL);
1439 if (ACPI_SUCCESS(status)) {
1440 level++;
1441 phandle = chandle;
1442 chandle = NULL;
1443 parent = child;
1444 }
1445 }
1446 }
1447
1448 return 0;
1449 }
1450
1451 int
1452 acpi_bus_add(struct acpi_device **child,
1453 struct acpi_device *parent, acpi_handle handle, int type)
1454 {
1455 int result;
1456 struct acpi_bus_ops ops;
1457
1458 memset(&ops, 0, sizeof(ops));
1459 ops.acpi_op_add = 1;
1460
1461 result = acpi_add_single_object(child, parent, handle, type, &ops);
1462 if (!result)
1463 result = acpi_bus_scan(*child, &ops);
1464
1465 return result;
1466 }
1467
1468 EXPORT_SYMBOL(acpi_bus_add);
1469
1470 int acpi_bus_start(struct acpi_device *device)
1471 {
1472 int result;
1473 struct acpi_bus_ops ops;
1474
1475
1476 if (!device)
1477 return -EINVAL;
1478
1479 result = acpi_start_single_object(device);
1480 if (!result) {
1481 memset(&ops, 0, sizeof(ops));
1482 ops.acpi_op_start = 1;
1483 result = acpi_bus_scan(device, &ops);
1484 }
1485 return result;
1486 }
1487
1488 EXPORT_SYMBOL(acpi_bus_start);
1489
1490 int acpi_bus_trim(struct acpi_device *start, int rmdevice)
1491 {
1492 acpi_status status;
1493 struct acpi_device *parent, *child;
1494 acpi_handle phandle, chandle;
1495 acpi_object_type type;
1496 u32 level = 1;
1497 int err = 0;
1498
1499 parent = start;
1500 phandle = start->handle;
1501 child = chandle = NULL;
1502
1503 while ((level > 0) && parent && (!err)) {
1504 status = acpi_get_next_object(ACPI_TYPE_ANY, phandle,
1505 chandle, &chandle);
1506
1507 /*
1508 * If this scope is exhausted then move our way back up.
1509 */
1510 if (ACPI_FAILURE(status)) {
1511 level--;
1512 chandle = phandle;
1513 acpi_get_parent(phandle, &phandle);
1514 child = parent;
1515 parent = parent->parent;
1516
1517 if (level == 0)
1518 err = acpi_bus_remove(child, rmdevice);
1519 else
1520 err = acpi_bus_remove(child, 1);
1521
1522 continue;
1523 }
1524
1525 status = acpi_get_type(chandle, &type);
1526 if (ACPI_FAILURE(status)) {
1527 continue;
1528 }
1529 /*
1530 * If there is a device corresponding to chandle then
1531 * parse it (depth-first).
1532 */
1533 if (acpi_bus_get_device(chandle, &child) == 0) {
1534 level++;
1535 phandle = chandle;
1536 chandle = NULL;
1537 parent = child;
1538 }
1539 continue;
1540 }
1541 return err;
1542 }
1543 EXPORT_SYMBOL_GPL(acpi_bus_trim);
1544
1545
1546 static int acpi_bus_scan_fixed(struct acpi_device *root)
1547 {
1548 int result = 0;
1549 struct acpi_device *device = NULL;
1550 struct acpi_bus_ops ops;
1551
1552 if (!root)
1553 return -ENODEV;
1554
1555 memset(&ops, 0, sizeof(ops));
1556 ops.acpi_op_add = 1;
1557 ops.acpi_op_start = 1;
1558
1559 /*
1560 * Enumerate all fixed-feature devices.
1561 */
1562 if ((acpi_gbl_FADT.flags & ACPI_FADT_POWER_BUTTON) == 0) {
1563 result = acpi_add_single_object(&device, acpi_root,
1564 NULL,
1565 ACPI_BUS_TYPE_POWER_BUTTON,
1566 &ops);
1567 }
1568
1569 if ((acpi_gbl_FADT.flags & ACPI_FADT_SLEEP_BUTTON) == 0) {
1570 result = acpi_add_single_object(&device, acpi_root,
1571 NULL,
1572 ACPI_BUS_TYPE_SLEEP_BUTTON,
1573 &ops);
1574 }
1575
1576 return result;
1577 }
1578
1579 int __init acpi_scan_init(void)
1580 {
1581 int result;
1582 struct acpi_bus_ops ops;
1583
1584 memset(&ops, 0, sizeof(ops));
1585 ops.acpi_op_add = 1;
1586 ops.acpi_op_start = 1;
1587
1588 result = bus_register(&acpi_bus_type);
1589 if (result) {
1590 /* We don't want to quit even if we failed to add suspend/resume */
1591 printk(KERN_ERR PREFIX "Could not register bus type\n");
1592 }
1593
1594 /*
1595 * Create the root device in the bus's device tree
1596 */
1597 result = acpi_add_single_object(&acpi_root, NULL, ACPI_ROOT_OBJECT,
1598 ACPI_BUS_TYPE_SYSTEM, &ops);
1599 if (result)
1600 goto Done;
1601
1602 /*
1603 * Enumerate devices in the ACPI namespace.
1604 */
1605 result = acpi_bus_scan_fixed(acpi_root);
1606
1607 if (!result)
1608 result = acpi_bus_scan(acpi_root, &ops);
1609
1610 if (result)
1611 acpi_device_unregister(acpi_root, ACPI_BUS_REMOVAL_NORMAL);
1612
1613 Done:
1614 return result;
1615 }
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