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cipso: unsigned buf_len cannot be negative
[linux-2.6/next.git] / drivers / acpi / scan.c
bloba9dda8e0f9f9c2c14859b027fcd80b1b88abdeda
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 #include <acpi/acinterp.h> /* for acpi_ex_eisa_id_to_string() */
14
15 #define _COMPONENT ACPI_BUS_COMPONENT
16 ACPI_MODULE_NAME("scan");
17 #define STRUCT_TO_INT(s) (*((int*)&s))
18 extern struct acpi_device *acpi_root;
19
20 #define ACPI_BUS_CLASS "system_bus"
21 #define ACPI_BUS_HID "LNXSYBUS"
22 #define ACPI_BUS_DEVICE_NAME "System Bus"
23
24 static LIST_HEAD(acpi_device_list);
25 static LIST_HEAD(acpi_bus_id_list);
26 DEFINE_SPINLOCK(acpi_device_lock);
27 LIST_HEAD(acpi_wakeup_device_list);
28
29 struct acpi_device_bus_id{
30 char bus_id[15];
31 unsigned int instance_no;
32 struct list_head node;
33 };
34
35 /*
36 * Creates hid/cid(s) string needed for modalias and uevent
37 * e.g. on a device with hid:IBM0001 and cid:ACPI0001 you get:
38 * char *modalias: "acpi:IBM0001:ACPI0001"
39 */
40 static int create_modalias(struct acpi_device *acpi_dev, char *modalias,
41 int size)
42 {
43 int len;
44 int count;
45
46 if (!acpi_dev->flags.hardware_id && !acpi_dev->flags.compatible_ids)
47 return -ENODEV;
48
49 len = snprintf(modalias, size, "acpi:");
50 size -= len;
51
52 if (acpi_dev->flags.hardware_id) {
53 count = snprintf(&modalias[len], size, "%s:",
54 acpi_dev->pnp.hardware_id);
55 if (count < 0 || count >= size)
56 return -EINVAL;
57 len += count;
58 size -= count;
59 }
60
61 if (acpi_dev->flags.compatible_ids) {
62 struct acpi_compatible_id_list *cid_list;
63 int i;
64
65 cid_list = acpi_dev->pnp.cid_list;
66 for (i = 0; i < cid_list->count; i++) {
67 count = snprintf(&modalias[len], size, "%s:",
68 cid_list->id[i].value);
69 if (count < 0 || count >= size) {
70 printk(KERN_ERR PREFIX "%s cid[%i] exceeds event buffer size",
71 acpi_dev->pnp.device_name, i);
72 break;
73 }
74 len += count;
75 size -= count;
76 }
77 }
78
79 modalias[len] = '\0';
80 return len;
81 }
82
83 static ssize_t
84 acpi_device_modalias_show(struct device *dev, struct device_attribute *attr, char *buf) {
85 struct acpi_device *acpi_dev = to_acpi_device(dev);
86 int len;
87
88 /* Device has no HID and no CID or string is >1024 */
89 len = create_modalias(acpi_dev, buf, 1024);
90 if (len <= 0)
91 return 0;
92 buf[len++] = '\n';
93 return len;
94 }
95 static DEVICE_ATTR(modalias, 0444, acpi_device_modalias_show, NULL);
96
97 static int acpi_bus_hot_remove_device(void *context)
98 {
99 struct acpi_device *device;
100 acpi_handle handle = context;
101 struct acpi_object_list arg_list;
102 union acpi_object arg;
103 acpi_status status = AE_OK;
104
105 if (acpi_bus_get_device(handle, &device))
106 return 0;
107
108 if (!device)
109 return 0;
110
111 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
112 "Hot-removing device %s...\n", device->dev.bus_id));
113
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 int acpi_bus_driver_init(struct acpi_device *, struct acpi_driver *);
363 static int acpi_start_single_object(struct acpi_device *);
364 static int acpi_device_probe(struct device * dev)
365 {
366 struct acpi_device *acpi_dev = to_acpi_device(dev);
367 struct acpi_driver *acpi_drv = to_acpi_driver(dev->driver);
368 int ret;
369
370 ret = acpi_bus_driver_init(acpi_dev, acpi_drv);
371 if (!ret) {
372 if (acpi_dev->bus_ops.acpi_op_start)
373 acpi_start_single_object(acpi_dev);
374 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
375 "Found driver [%s] for device [%s]\n",
376 acpi_drv->name, acpi_dev->pnp.bus_id));
377 get_device(dev);
378 }
379 return ret;
380 }
381
382 static int acpi_device_remove(struct device * dev)
383 {
384 struct acpi_device *acpi_dev = to_acpi_device(dev);
385 struct acpi_driver *acpi_drv = acpi_dev->driver;
386
387 if (acpi_drv) {
388 if (acpi_drv->ops.stop)
389 acpi_drv->ops.stop(acpi_dev, acpi_dev->removal_type);
390 if (acpi_drv->ops.remove)
391 acpi_drv->ops.remove(acpi_dev, acpi_dev->removal_type);
392 }
393 acpi_dev->driver = NULL;
394 acpi_dev->driver_data = NULL;
395
396 put_device(dev);
397 return 0;
398 }
399
400 static void acpi_device_shutdown(struct device *dev)
401 {
402 struct acpi_device *acpi_dev = to_acpi_device(dev);
403 struct acpi_driver *acpi_drv = acpi_dev->driver;
404
405 if (acpi_drv && acpi_drv->ops.shutdown)
406 acpi_drv->ops.shutdown(acpi_dev);
407
408 return ;
409 }
410
411 struct bus_type acpi_bus_type = {
412 .name = "acpi",
413 .suspend = acpi_device_suspend,
414 .resume = acpi_device_resume,
415 .shutdown = acpi_device_shutdown,
416 .match = acpi_bus_match,
417 .probe = acpi_device_probe,
418 .remove = acpi_device_remove,
419 .uevent = acpi_device_uevent,
420 };
421
422 static int acpi_device_register(struct acpi_device *device,
423 struct acpi_device *parent)
424 {
425 int result;
426 struct acpi_device_bus_id *acpi_device_bus_id, *new_bus_id;
427 int found = 0;
428 /*
429 * Linkage
430 * -------
431 * Link this device to its parent and siblings.
432 */
433 INIT_LIST_HEAD(&device->children);
434 INIT_LIST_HEAD(&device->node);
435 INIT_LIST_HEAD(&device->g_list);
436 INIT_LIST_HEAD(&device->wakeup_list);
437
438 new_bus_id = kzalloc(sizeof(struct acpi_device_bus_id), GFP_KERNEL);
439 if (!new_bus_id) {
440 printk(KERN_ERR PREFIX "Memory allocation error\n");
441 return -ENOMEM;
442 }
443
444 spin_lock(&acpi_device_lock);
445 /*
446 * Find suitable bus_id and instance number in acpi_bus_id_list
447 * If failed, create one and link it into acpi_bus_id_list
448 */
449 list_for_each_entry(acpi_device_bus_id, &acpi_bus_id_list, node) {
450 if(!strcmp(acpi_device_bus_id->bus_id, device->flags.hardware_id? device->pnp.hardware_id : "device")) {
451 acpi_device_bus_id->instance_no ++;
452 found = 1;
453 kfree(new_bus_id);
454 break;
455 }
456 }
457 if(!found) {
458 acpi_device_bus_id = new_bus_id;
459 strcpy(acpi_device_bus_id->bus_id, device->flags.hardware_id ? device->pnp.hardware_id : "device");
460 acpi_device_bus_id->instance_no = 0;
461 list_add_tail(&acpi_device_bus_id->node, &acpi_bus_id_list);
462 }
463 sprintf(device->dev.bus_id, "%s:%02x", acpi_device_bus_id->bus_id, acpi_device_bus_id->instance_no);
464
465 if (device->parent) {
466 list_add_tail(&device->node, &device->parent->children);
467 list_add_tail(&device->g_list, &device->parent->g_list);
468 } else
469 list_add_tail(&device->g_list, &acpi_device_list);
470 if (device->wakeup.flags.valid)
471 list_add_tail(&device->wakeup_list, &acpi_wakeup_device_list);
472 spin_unlock(&acpi_device_lock);
473
474 if (device->parent)
475 device->dev.parent = &parent->dev;
476 device->dev.bus = &acpi_bus_type;
477 device_initialize(&device->dev);
478 device->dev.release = &acpi_device_release;
479 result = device_add(&device->dev);
480 if(result) {
481 dev_err(&device->dev, "Error adding device\n");
482 goto end;
483 }
484
485 result = acpi_device_setup_files(device);
486 if(result)
487 printk(KERN_ERR PREFIX "Error creating sysfs interface for device %s\n", device->dev.bus_id);
488
489 device->removal_type = ACPI_BUS_REMOVAL_NORMAL;
490 return 0;
491 end:
492 spin_lock(&acpi_device_lock);
493 if (device->parent) {
494 list_del(&device->node);
495 list_del(&device->g_list);
496 } else
497 list_del(&device->g_list);
498 list_del(&device->wakeup_list);
499 spin_unlock(&acpi_device_lock);
500 return result;
501 }
502
503 static void acpi_device_unregister(struct acpi_device *device, int type)
504 {
505 spin_lock(&acpi_device_lock);
506 if (device->parent) {
507 list_del(&device->node);
508 list_del(&device->g_list);
509 } else
510 list_del(&device->g_list);
511
512 list_del(&device->wakeup_list);
513 spin_unlock(&acpi_device_lock);
514
515 acpi_detach_data(device->handle, acpi_bus_data_handler);
516
517 acpi_device_remove_files(device);
518 device_unregister(&device->dev);
519 }
520
521 /* --------------------------------------------------------------------------
522 Driver Management
523 -------------------------------------------------------------------------- */
524 /**
525 * acpi_bus_driver_init - add a device to a driver
526 * @device: the device to add and initialize
527 * @driver: driver for the device
528 *
529 * Used to initialize a device via its device driver. Called whenever a
530 * driver is bound to a device. Invokes the driver's add() ops.
531 */
532 static int
533 acpi_bus_driver_init(struct acpi_device *device, struct acpi_driver *driver)
534 {
535 int result = 0;
536
537
538 if (!device || !driver)
539 return -EINVAL;
540
541 if (!driver->ops.add)
542 return -ENOSYS;
543
544 result = driver->ops.add(device);
545 if (result) {
546 device->driver = NULL;
547 device->driver_data = NULL;
548 return result;
549 }
550
551 device->driver = driver;
552
553 /*
554 * TBD - Configuration Management: Assign resources to device based
555 * upon possible configuration and currently allocated resources.
556 */
557
558 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
559 "Driver successfully bound to device\n"));
560 return 0;
561 }
562
563 static int acpi_start_single_object(struct acpi_device *device)
564 {
565 int result = 0;
566 struct acpi_driver *driver;
567
568
569 if (!(driver = device->driver))
570 return 0;
571
572 if (driver->ops.start) {
573 result = driver->ops.start(device);
574 if (result && driver->ops.remove)
575 driver->ops.remove(device, ACPI_BUS_REMOVAL_NORMAL);
576 }
577
578 return result;
579 }
580
581 /**
582 * acpi_bus_register_driver - register a driver with the ACPI bus
583 * @driver: driver being registered
584 *
585 * Registers a driver with the ACPI bus. Searches the namespace for all
586 * devices that match the driver's criteria and binds. Returns zero for
587 * success or a negative error status for failure.
588 */
589 int acpi_bus_register_driver(struct acpi_driver *driver)
590 {
591 int ret;
592
593 if (acpi_disabled)
594 return -ENODEV;
595 driver->drv.name = driver->name;
596 driver->drv.bus = &acpi_bus_type;
597 driver->drv.owner = driver->owner;
598
599 ret = driver_register(&driver->drv);
600 return ret;
601 }
602
603 EXPORT_SYMBOL(acpi_bus_register_driver);
604
605 /**
606 * acpi_bus_unregister_driver - unregisters a driver with the APIC bus
607 * @driver: driver to unregister
608 *
609 * Unregisters a driver with the ACPI bus. Searches the namespace for all
610 * devices that match the driver's criteria and unbinds.
611 */
612 void acpi_bus_unregister_driver(struct acpi_driver *driver)
613 {
614 driver_unregister(&driver->drv);
615 }
616
617 EXPORT_SYMBOL(acpi_bus_unregister_driver);
618
619 /* --------------------------------------------------------------------------
620 Device Enumeration
621 -------------------------------------------------------------------------- */
622 acpi_status
623 acpi_bus_get_ejd(acpi_handle handle, acpi_handle *ejd)
624 {
625 acpi_status status;
626 acpi_handle tmp;
627 struct acpi_buffer buffer = {ACPI_ALLOCATE_BUFFER, NULL};
628 union acpi_object *obj;
629
630 status = acpi_get_handle(handle, "_EJD", &tmp);
631 if (ACPI_FAILURE(status))
632 return status;
633
634 status = acpi_evaluate_object(handle, "_EJD", NULL, &buffer);
635 if (ACPI_SUCCESS(status)) {
636 obj = buffer.pointer;
637 status = acpi_get_handle(ACPI_ROOT_OBJECT, obj->string.pointer,
638 ejd);
639 kfree(buffer.pointer);
640 }
641 return status;
642 }
643 EXPORT_SYMBOL_GPL(acpi_bus_get_ejd);
644
645 void acpi_bus_data_handler(acpi_handle handle, u32 function, void *context)
646 {
647
648 /* TBD */
649
650 return;
651 }
652
653 static int acpi_bus_get_perf_flags(struct acpi_device *device)
654 {
655 device->performance.state = ACPI_STATE_UNKNOWN;
656 return 0;
657 }
658
659 static acpi_status
660 acpi_bus_extract_wakeup_device_power_package(struct acpi_device *device,
661 union acpi_object *package)
662 {
663 int i = 0;
664 union acpi_object *element = NULL;
665
666 if (!device || !package || (package->package.count < 2))
667 return AE_BAD_PARAMETER;
668
669 element = &(package->package.elements[0]);
670 if (!element)
671 return AE_BAD_PARAMETER;
672 if (element->type == ACPI_TYPE_PACKAGE) {
673 if ((element->package.count < 2) ||
674 (element->package.elements[0].type !=
675 ACPI_TYPE_LOCAL_REFERENCE)
676 || (element->package.elements[1].type != ACPI_TYPE_INTEGER))
677 return AE_BAD_DATA;
678 device->wakeup.gpe_device =
679 element->package.elements[0].reference.handle;
680 device->wakeup.gpe_number =
681 (u32) element->package.elements[1].integer.value;
682 } else if (element->type == ACPI_TYPE_INTEGER) {
683 device->wakeup.gpe_number = element->integer.value;
684 } else
685 return AE_BAD_DATA;
686
687 element = &(package->package.elements[1]);
688 if (element->type != ACPI_TYPE_INTEGER) {
689 return AE_BAD_DATA;
690 }
691 device->wakeup.sleep_state = element->integer.value;
692
693 if ((package->package.count - 2) > ACPI_MAX_HANDLES) {
694 return AE_NO_MEMORY;
695 }
696 device->wakeup.resources.count = package->package.count - 2;
697 for (i = 0; i < device->wakeup.resources.count; i++) {
698 element = &(package->package.elements[i + 2]);
699 if (element->type != ACPI_TYPE_LOCAL_REFERENCE)
700 return AE_BAD_DATA;
701
702 device->wakeup.resources.handles[i] = element->reference.handle;
703 }
704
705 return AE_OK;
706 }
707
708 static int acpi_bus_get_wakeup_device_flags(struct acpi_device *device)
709 {
710 acpi_status status = 0;
711 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
712 union acpi_object *package = NULL;
713 int psw_error;
714
715 struct acpi_device_id button_device_ids[] = {
716 {"PNP0C0D", 0},
717 {"PNP0C0C", 0},
718 {"PNP0C0E", 0},
719 {"", 0},
720 };
721
722 /* _PRW */
723 status = acpi_evaluate_object(device->handle, "_PRW", NULL, &buffer);
724 if (ACPI_FAILURE(status)) {
725 ACPI_EXCEPTION((AE_INFO, status, "Evaluating _PRW"));
726 goto end;
727 }
728
729 package = (union acpi_object *)buffer.pointer;
730 status = acpi_bus_extract_wakeup_device_power_package(device, package);
731 if (ACPI_FAILURE(status)) {
732 ACPI_EXCEPTION((AE_INFO, status, "Extracting _PRW package"));
733 goto end;
734 }
735
736 kfree(buffer.pointer);
737
738 device->wakeup.flags.valid = 1;
739 /* Call _PSW/_DSW object to disable its ability to wake the sleeping
740 * system for the ACPI device with the _PRW object.
741 * The _PSW object is depreciated in ACPI 3.0 and is replaced by _DSW.
742 * So it is necessary to call _DSW object first. Only when it is not
743 * present will the _PSW object used.
744 */
745 psw_error = acpi_device_sleep_wake(device, 0, 0, 0);
746 if (psw_error)
747 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
748 "error in _DSW or _PSW evaluation\n"));
749
750 /* Power button, Lid switch always enable wakeup */
751 if (!acpi_match_device_ids(device, button_device_ids))
752 device->wakeup.flags.run_wake = 1;
753
754 /*
755 * Don't set Power button GPE as run_wake
756 * if Fixed Power button is used
757 */
758 if (!strcmp(device->pnp.hardware_id, "PNP0C0C") &&
759 !(acpi_gbl_FADT.flags & ACPI_FADT_POWER_BUTTON)) {
760 device->wakeup.flags.run_wake = 0;
761 device->wakeup.flags.valid = 0;
762 }
763
764 end:
765 if (ACPI_FAILURE(status))
766 device->flags.wake_capable = 0;
767 return 0;
768 }
769
770 static int acpi_bus_get_power_flags(struct acpi_device *device)
771 {
772 acpi_status status = 0;
773 acpi_handle handle = NULL;
774 u32 i = 0;
775
776
777 /*
778 * Power Management Flags
779 */
780 status = acpi_get_handle(device->handle, "_PSC", &handle);
781 if (ACPI_SUCCESS(status))
782 device->power.flags.explicit_get = 1;
783 status = acpi_get_handle(device->handle, "_IRC", &handle);
784 if (ACPI_SUCCESS(status))
785 device->power.flags.inrush_current = 1;
786
787 /*
788 * Enumerate supported power management states
789 */
790 for (i = ACPI_STATE_D0; i <= ACPI_STATE_D3; i++) {
791 struct acpi_device_power_state *ps = &device->power.states[i];
792 char object_name[5] = { '_', 'P', 'R', '0' + i, '\0' };
793
794 /* Evaluate "_PRx" to se if power resources are referenced */
795 acpi_evaluate_reference(device->handle, object_name, NULL,
796 &ps->resources);
797 if (ps->resources.count) {
798 device->power.flags.power_resources = 1;
799 ps->flags.valid = 1;
800 }
801
802 /* Evaluate "_PSx" to see if we can do explicit sets */
803 object_name[2] = 'S';
804 status = acpi_get_handle(device->handle, object_name, &handle);
805 if (ACPI_SUCCESS(status)) {
806 ps->flags.explicit_set = 1;
807 ps->flags.valid = 1;
808 }
809
810 /* State is valid if we have some power control */
811 if (ps->resources.count || ps->flags.explicit_set)
812 ps->flags.valid = 1;
813
814 ps->power = -1; /* Unknown - driver assigned */
815 ps->latency = -1; /* Unknown - driver assigned */
816 }
817
818 /* Set defaults for D0 and D3 states (always valid) */
819 device->power.states[ACPI_STATE_D0].flags.valid = 1;
820 device->power.states[ACPI_STATE_D0].power = 100;
821 device->power.states[ACPI_STATE_D3].flags.valid = 1;
822 device->power.states[ACPI_STATE_D3].power = 0;
823
824 /* TBD: System wake support and resource requirements. */
825
826 device->power.state = ACPI_STATE_UNKNOWN;
827 acpi_bus_get_power(device->handle, &(device->power.state));
828
829 return 0;
830 }
831
832 static int acpi_bus_get_flags(struct acpi_device *device)
833 {
834 acpi_status status = AE_OK;
835 acpi_handle temp = NULL;
836
837
838 /* Presence of _STA indicates 'dynamic_status' */
839 status = acpi_get_handle(device->handle, "_STA", &temp);
840 if (ACPI_SUCCESS(status))
841 device->flags.dynamic_status = 1;
842
843 /* Presence of _CID indicates 'compatible_ids' */
844 status = acpi_get_handle(device->handle, "_CID", &temp);
845 if (ACPI_SUCCESS(status))
846 device->flags.compatible_ids = 1;
847
848 /* Presence of _RMV indicates 'removable' */
849 status = acpi_get_handle(device->handle, "_RMV", &temp);
850 if (ACPI_SUCCESS(status))
851 device->flags.removable = 1;
852
853 /* Presence of _EJD|_EJ0 indicates 'ejectable' */
854 status = acpi_get_handle(device->handle, "_EJD", &temp);
855 if (ACPI_SUCCESS(status))
856 device->flags.ejectable = 1;
857 else {
858 status = acpi_get_handle(device->handle, "_EJ0", &temp);
859 if (ACPI_SUCCESS(status))
860 device->flags.ejectable = 1;
861 }
862
863 /* Presence of _LCK indicates 'lockable' */
864 status = acpi_get_handle(device->handle, "_LCK", &temp);
865 if (ACPI_SUCCESS(status))
866 device->flags.lockable = 1;
867
868 /* Presence of _PS0|_PR0 indicates 'power manageable' */
869 status = acpi_get_handle(device->handle, "_PS0", &temp);
870 if (ACPI_FAILURE(status))
871 status = acpi_get_handle(device->handle, "_PR0", &temp);
872 if (ACPI_SUCCESS(status))
873 device->flags.power_manageable = 1;
874
875 /* Presence of _PRW indicates wake capable */
876 status = acpi_get_handle(device->handle, "_PRW", &temp);
877 if (ACPI_SUCCESS(status))
878 device->flags.wake_capable = 1;
879
880 /* TBD: Performance management */
881
882 return 0;
883 }
884
885 static void acpi_device_get_busid(struct acpi_device *device,
886 acpi_handle handle, int type)
887 {
888 char bus_id[5] = { '?', 0 };
889 struct acpi_buffer buffer = { sizeof(bus_id), bus_id };
890 int i = 0;
891
892 /*
893 * Bus ID
894 * ------
895 * The device's Bus ID is simply the object name.
896 * TBD: Shouldn't this value be unique (within the ACPI namespace)?
897 */
898 switch (type) {
899 case ACPI_BUS_TYPE_SYSTEM:
900 strcpy(device->pnp.bus_id, "ACPI");
901 break;
902 case ACPI_BUS_TYPE_POWER_BUTTON:
903 strcpy(device->pnp.bus_id, "PWRF");
904 break;
905 case ACPI_BUS_TYPE_SLEEP_BUTTON:
906 strcpy(device->pnp.bus_id, "SLPF");
907 break;
908 default:
909 acpi_get_name(handle, ACPI_SINGLE_NAME, &buffer);
910 /* Clean up trailing underscores (if any) */
911 for (i = 3; i > 1; i--) {
912 if (bus_id[i] == '_')
913 bus_id[i] = '\0';
914 else
915 break;
916 }
917 strcpy(device->pnp.bus_id, bus_id);
918 break;
919 }
920 }
921
922 static int
923 acpi_video_bus_match(struct acpi_device *device)
924 {
925 acpi_handle h_dummy;
926
927 if (!device)
928 return -EINVAL;
929
930 /* Since there is no HID, CID for ACPI Video drivers, we have
931 * to check well known required nodes for each feature we support.
932 */
933
934 /* Does this device able to support video switching ? */
935 if (ACPI_SUCCESS(acpi_get_handle(device->handle, "_DOD", &h_dummy)) &&
936 ACPI_SUCCESS(acpi_get_handle(device->handle, "_DOS", &h_dummy)))
937 return 0;
938
939 /* Does this device able to retrieve a video ROM ? */
940 if (ACPI_SUCCESS(acpi_get_handle(device->handle, "_ROM", &h_dummy)))
941 return 0;
942
943 /* Does this device able to configure which video head to be POSTed ? */
944 if (ACPI_SUCCESS(acpi_get_handle(device->handle, "_VPO", &h_dummy)) &&
945 ACPI_SUCCESS(acpi_get_handle(device->handle, "_GPD", &h_dummy)) &&
946 ACPI_SUCCESS(acpi_get_handle(device->handle, "_SPD", &h_dummy)))
947 return 0;
948
949 return -ENODEV;
950 }
951
952 /*
953 * acpi_bay_match - see if a device is an ejectable driver bay
954 *
955 * If an acpi object is ejectable and has one of the ACPI ATA methods defined,
956 * then we can safely call it an ejectable drive bay
957 */
958 static int acpi_bay_match(struct acpi_device *device){
959 acpi_status status;
960 acpi_handle handle;
961 acpi_handle tmp;
962 acpi_handle phandle;
963
964 handle = device->handle;
965
966 status = acpi_get_handle(handle, "_EJ0", &tmp);
967 if (ACPI_FAILURE(status))
968 return -ENODEV;
969
970 if ((ACPI_SUCCESS(acpi_get_handle(handle, "_GTF", &tmp))) ||
971 (ACPI_SUCCESS(acpi_get_handle(handle, "_GTM", &tmp))) ||
972 (ACPI_SUCCESS(acpi_get_handle(handle, "_STM", &tmp))) ||
973 (ACPI_SUCCESS(acpi_get_handle(handle, "_SDD", &tmp))))
974 return 0;
975
976 if (acpi_get_parent(handle, &phandle))
977 return -ENODEV;
978
979 if ((ACPI_SUCCESS(acpi_get_handle(phandle, "_GTF", &tmp))) ||
980 (ACPI_SUCCESS(acpi_get_handle(phandle, "_GTM", &tmp))) ||
981 (ACPI_SUCCESS(acpi_get_handle(phandle, "_STM", &tmp))) ||
982 (ACPI_SUCCESS(acpi_get_handle(phandle, "_SDD", &tmp))))
983 return 0;
984
985 return -ENODEV;
986 }
987
988 /*
989 * acpi_dock_match - see if a device has a _DCK method
990 */
991 static int acpi_dock_match(struct acpi_device *device)
992 {
993 acpi_handle tmp;
994 return acpi_get_handle(device->handle, "_DCK", &tmp);
995 }
996
997 static void acpi_device_set_id(struct acpi_device *device,
998 struct acpi_device *parent, acpi_handle handle,
999 int type)
1000 {
1001 struct acpi_device_info *info;
1002 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
1003 char *hid = NULL;
1004 char *uid = NULL;
1005 struct acpi_compatible_id_list *cid_list = NULL;
1006 const char *cid_add = NULL;
1007 acpi_status status;
1008
1009 switch (type) {
1010 case ACPI_BUS_TYPE_DEVICE:
1011 status = acpi_get_object_info(handle, &buffer);
1012 if (ACPI_FAILURE(status)) {
1013 printk(KERN_ERR PREFIX "%s: Error reading device info\n", __func__);
1014 return;
1015 }
1016
1017 info = buffer.pointer;
1018 if (info->valid & ACPI_VALID_HID)
1019 hid = info->hardware_id.value;
1020 if (info->valid & ACPI_VALID_UID)
1021 uid = info->unique_id.value;
1022 if (info->valid & ACPI_VALID_CID)
1023 cid_list = &info->compatibility_id;
1024 if (info->valid & ACPI_VALID_ADR) {
1025 device->pnp.bus_address = info->address;
1026 device->flags.bus_address = 1;
1027 }
1028
1029 /* If we have a video/bay/dock device, add our selfdefined
1030 HID to the CID list. Like that the video/bay/dock drivers
1031 will get autoloaded and the device might still match
1032 against another driver.
1033 */
1034 if (ACPI_SUCCESS(acpi_video_bus_match(device)))
1035 cid_add = ACPI_VIDEO_HID;
1036 else if (ACPI_SUCCESS(acpi_bay_match(device)))
1037 cid_add = ACPI_BAY_HID;
1038 else if (ACPI_SUCCESS(acpi_dock_match(device)))
1039 cid_add = ACPI_DOCK_HID;
1040
1041 break;
1042 case ACPI_BUS_TYPE_POWER:
1043 hid = ACPI_POWER_HID;
1044 break;
1045 case ACPI_BUS_TYPE_PROCESSOR:
1046 hid = ACPI_PROCESSOR_HID;
1047 break;
1048 case ACPI_BUS_TYPE_SYSTEM:
1049 hid = ACPI_SYSTEM_HID;
1050 break;
1051 case ACPI_BUS_TYPE_THERMAL:
1052 hid = ACPI_THERMAL_HID;
1053 break;
1054 case ACPI_BUS_TYPE_POWER_BUTTON:
1055 hid = ACPI_BUTTON_HID_POWERF;
1056 break;
1057 case ACPI_BUS_TYPE_SLEEP_BUTTON:
1058 hid = ACPI_BUTTON_HID_SLEEPF;
1059 break;
1060 }
1061
1062 /*
1063 * \_SB
1064 * ----
1065 * Fix for the system root bus device -- the only root-level device.
1066 */
1067 if (((acpi_handle)parent == ACPI_ROOT_OBJECT) && (type == ACPI_BUS_TYPE_DEVICE)) {
1068 hid = ACPI_BUS_HID;
1069 strcpy(device->pnp.device_name, ACPI_BUS_DEVICE_NAME);
1070 strcpy(device->pnp.device_class, ACPI_BUS_CLASS);
1071 }
1072
1073 if (hid) {
1074 strcpy(device->pnp.hardware_id, hid);
1075 device->flags.hardware_id = 1;
1076 }
1077 if (uid) {
1078 strcpy(device->pnp.unique_id, uid);
1079 device->flags.unique_id = 1;
1080 }
1081 if (cid_list || cid_add) {
1082 struct acpi_compatible_id_list *list;
1083 int size = 0;
1084 int count = 0;
1085
1086 if (cid_list) {
1087 size = cid_list->size;
1088 } else if (cid_add) {
1089 size = sizeof(struct acpi_compatible_id_list);
1090 cid_list = ACPI_ALLOCATE_ZEROED((acpi_size) size);
1091 if (!cid_list) {
1092 printk(KERN_ERR "Memory allocation error\n");
1093 kfree(buffer.pointer);
1094 return;
1095 } else {
1096 cid_list->count = 0;
1097 cid_list->size = size;
1098 }
1099 }
1100 if (cid_add)
1101 size += sizeof(struct acpi_compatible_id);
1102 list = kmalloc(size, GFP_KERNEL);
1103
1104 if (list) {
1105 if (cid_list) {
1106 memcpy(list, cid_list, cid_list->size);
1107 count = cid_list->count;
1108 }
1109 if (cid_add) {
1110 strncpy(list->id[count].value, cid_add,
1111 ACPI_MAX_CID_LENGTH);
1112 count++;
1113 device->flags.compatible_ids = 1;
1114 }
1115 list->size = size;
1116 list->count = count;
1117 device->pnp.cid_list = list;
1118 } else
1119 printk(KERN_ERR PREFIX "Memory allocation error\n");
1120 }
1121
1122 kfree(buffer.pointer);
1123 }
1124
1125 static int acpi_device_set_context(struct acpi_device *device, int type)
1126 {
1127 acpi_status status = AE_OK;
1128 int result = 0;
1129 /*
1130 * Context
1131 * -------
1132 * Attach this 'struct acpi_device' to the ACPI object. This makes
1133 * resolutions from handle->device very efficient. Note that we need
1134 * to be careful with fixed-feature devices as they all attach to the
1135 * root object.
1136 */
1137 if (type != ACPI_BUS_TYPE_POWER_BUTTON &&
1138 type != ACPI_BUS_TYPE_SLEEP_BUTTON) {
1139 status = acpi_attach_data(device->handle,
1140 acpi_bus_data_handler, device);
1141
1142 if (ACPI_FAILURE(status)) {
1143 printk(KERN_ERR PREFIX "Error attaching device data\n");
1144 result = -ENODEV;
1145 }
1146 }
1147 return result;
1148 }
1149
1150 static int acpi_bus_remove(struct acpi_device *dev, int rmdevice)
1151 {
1152 if (!dev)
1153 return -EINVAL;
1154
1155 dev->removal_type = ACPI_BUS_REMOVAL_EJECT;
1156 device_release_driver(&dev->dev);
1157
1158 if (!rmdevice)
1159 return 0;
1160
1161 /*
1162 * unbind _ADR-Based Devices when hot removal
1163 */
1164 if (dev->flags.bus_address) {
1165 if ((dev->parent) && (dev->parent->ops.unbind))
1166 dev->parent->ops.unbind(dev);
1167 }
1168 acpi_device_unregister(dev, ACPI_BUS_REMOVAL_EJECT);
1169
1170 return 0;
1171 }
1172
1173 static int
1174 acpi_add_single_object(struct acpi_device **child,
1175 struct acpi_device *parent, acpi_handle handle, int type,
1176 struct acpi_bus_ops *ops)
1177 {
1178 int result = 0;
1179 struct acpi_device *device = NULL;
1180
1181
1182 if (!child)
1183 return -EINVAL;
1184
1185 device = kzalloc(sizeof(struct acpi_device), GFP_KERNEL);
1186 if (!device) {
1187 printk(KERN_ERR PREFIX "Memory allocation error\n");
1188 return -ENOMEM;
1189 }
1190
1191 device->handle = handle;
1192 device->parent = parent;
1193 device->bus_ops = *ops; /* workround for not call .start */
1194
1195
1196 acpi_device_get_busid(device, handle, type);
1197
1198 /*
1199 * Flags
1200 * -----
1201 * Get prior to calling acpi_bus_get_status() so we know whether
1202 * or not _STA is present. Note that we only look for object
1203 * handles -- cannot evaluate objects until we know the device is
1204 * present and properly initialized.
1205 */
1206 result = acpi_bus_get_flags(device);
1207 if (result)
1208 goto end;
1209
1210 /*
1211 * Status
1212 * ------
1213 * See if the device is present. We always assume that non-Device
1214 * and non-Processor objects (e.g. thermal zones, power resources,
1215 * etc.) are present, functioning, etc. (at least when parent object
1216 * is present). Note that _STA has a different meaning for some
1217 * objects (e.g. power resources) so we need to be careful how we use
1218 * it.
1219 */
1220 switch (type) {
1221 case ACPI_BUS_TYPE_PROCESSOR:
1222 case ACPI_BUS_TYPE_DEVICE:
1223 result = acpi_bus_get_status(device);
1224 if (ACPI_FAILURE(result)) {
1225 result = -ENODEV;
1226 goto end;
1227 }
1228 /*
1229 * When the device is neither present nor functional, the
1230 * device should not be added to Linux ACPI device tree.
1231 * When the status of the device is not present but functinal,
1232 * it should be added to Linux ACPI tree. For example : bay
1233 * device , dock device.
1234 * In such conditions it is unncessary to check whether it is
1235 * bay device or dock device.
1236 */
1237 if (!device->status.present && !device->status.functional) {
1238 result = -ENODEV;
1239 goto end;
1240 }
1241 break;
1242 default:
1243 STRUCT_TO_INT(device->status) =
1244 ACPI_STA_DEVICE_PRESENT | ACPI_STA_DEVICE_ENABLED |
1245 ACPI_STA_DEVICE_UI | ACPI_STA_DEVICE_FUNCTIONING;
1246 break;
1247 }
1248
1249 /*
1250 * Initialize Device
1251 * -----------------
1252 * TBD: Synch with Core's enumeration/initialization process.
1253 */
1254
1255 /*
1256 * Hardware ID, Unique ID, & Bus Address
1257 * -------------------------------------
1258 */
1259 acpi_device_set_id(device, parent, handle, type);
1260
1261 /*
1262 * The ACPI device is attached to acpi handle before getting
1263 * the power/wakeup/peformance flags. Otherwise OS can't get
1264 * the corresponding ACPI device by the acpi handle in the course
1265 * of getting the power/wakeup/performance flags.
1266 */
1267 result = acpi_device_set_context(device, type);
1268 if (result)
1269 goto end;
1270
1271 /*
1272 * Power Management
1273 * ----------------
1274 */
1275 if (device->flags.power_manageable) {
1276 result = acpi_bus_get_power_flags(device);
1277 if (result)
1278 goto end;
1279 }
1280
1281 /*
1282 * Wakeup device management
1283 *-----------------------
1284 */
1285 if (device->flags.wake_capable) {
1286 result = acpi_bus_get_wakeup_device_flags(device);
1287 if (result)
1288 goto end;
1289 }
1290
1291 /*
1292 * Performance Management
1293 * ----------------------
1294 */
1295 if (device->flags.performance_manageable) {
1296 result = acpi_bus_get_perf_flags(device);
1297 if (result)
1298 goto end;
1299 }
1300
1301
1302 result = acpi_device_register(device, parent);
1303
1304 /*
1305 * Bind _ADR-Based Devices when hot add
1306 */
1307 if (device->flags.bus_address) {
1308 if (device->parent && device->parent->ops.bind)
1309 device->parent->ops.bind(device);
1310 }
1311
1312 end:
1313 if (!result)
1314 *child = device;
1315 else {
1316 kfree(device->pnp.cid_list);
1317 kfree(device);
1318 }
1319
1320 return result;
1321 }
1322
1323 static int acpi_bus_scan(struct acpi_device *start, struct acpi_bus_ops *ops)
1324 {
1325 acpi_status status = AE_OK;
1326 struct acpi_device *parent = NULL;
1327 struct acpi_device *child = NULL;
1328 acpi_handle phandle = NULL;
1329 acpi_handle chandle = NULL;
1330 acpi_object_type type = 0;
1331 u32 level = 1;
1332
1333
1334 if (!start)
1335 return -EINVAL;
1336
1337 parent = start;
1338 phandle = start->handle;
1339
1340 /*
1341 * Parse through the ACPI namespace, identify all 'devices', and
1342 * create a new 'struct acpi_device' for each.
1343 */
1344 while ((level > 0) && parent) {
1345
1346 status = acpi_get_next_object(ACPI_TYPE_ANY, phandle,
1347 chandle, &chandle);
1348
1349 /*
1350 * If this scope is exhausted then move our way back up.
1351 */
1352 if (ACPI_FAILURE(status)) {
1353 level--;
1354 chandle = phandle;
1355 acpi_get_parent(phandle, &phandle);
1356 if (parent->parent)
1357 parent = parent->parent;
1358 continue;
1359 }
1360
1361 status = acpi_get_type(chandle, &type);
1362 if (ACPI_FAILURE(status))
1363 continue;
1364
1365 /*
1366 * If this is a scope object then parse it (depth-first).
1367 */
1368 if (type == ACPI_TYPE_LOCAL_SCOPE) {
1369 level++;
1370 phandle = chandle;
1371 chandle = NULL;
1372 continue;
1373 }
1374
1375 /*
1376 * We're only interested in objects that we consider 'devices'.
1377 */
1378 switch (type) {
1379 case ACPI_TYPE_DEVICE:
1380 type = ACPI_BUS_TYPE_DEVICE;
1381 break;
1382 case ACPI_TYPE_PROCESSOR:
1383 type = ACPI_BUS_TYPE_PROCESSOR;
1384 break;
1385 case ACPI_TYPE_THERMAL:
1386 type = ACPI_BUS_TYPE_THERMAL;
1387 break;
1388 case ACPI_TYPE_POWER:
1389 type = ACPI_BUS_TYPE_POWER;
1390 break;
1391 default:
1392 continue;
1393 }
1394
1395 if (ops->acpi_op_add)
1396 status = acpi_add_single_object(&child, parent,
1397 chandle, type, ops);
1398 else
1399 status = acpi_bus_get_device(chandle, &child);
1400
1401 if (ACPI_FAILURE(status))
1402 continue;
1403
1404 if (ops->acpi_op_start && !(ops->acpi_op_add)) {
1405 status = acpi_start_single_object(child);
1406 if (ACPI_FAILURE(status))
1407 continue;
1408 }
1409
1410 /*
1411 * If the device is present, enabled, and functioning then
1412 * parse its scope (depth-first). Note that we need to
1413 * represent absent devices to facilitate PnP notifications
1414 * -- but only the subtree head (not all of its children,
1415 * which will be enumerated when the parent is inserted).
1416 *
1417 * TBD: Need notifications and other detection mechanisms
1418 * in place before we can fully implement this.
1419 */
1420 /*
1421 * When the device is not present but functional, it is also
1422 * necessary to scan the children of this device.
1423 */
1424 if (child->status.present || (!child->status.present &&
1425 child->status.functional)) {
1426 status = acpi_get_next_object(ACPI_TYPE_ANY, chandle,
1427 NULL, NULL);
1428 if (ACPI_SUCCESS(status)) {
1429 level++;
1430 phandle = chandle;
1431 chandle = NULL;
1432 parent = child;
1433 }
1434 }
1435 }
1436
1437 return 0;
1438 }
1439
1440 int
1441 acpi_bus_add(struct acpi_device **child,
1442 struct acpi_device *parent, acpi_handle handle, int type)
1443 {
1444 int result;
1445 struct acpi_bus_ops ops;
1446
1447 memset(&ops, 0, sizeof(ops));
1448 ops.acpi_op_add = 1;
1449
1450 result = acpi_add_single_object(child, parent, handle, type, &ops);
1451 if (!result)
1452 result = acpi_bus_scan(*child, &ops);
1453
1454 return result;
1455 }
1456
1457 EXPORT_SYMBOL(acpi_bus_add);
1458
1459 int acpi_bus_start(struct acpi_device *device)
1460 {
1461 int result;
1462 struct acpi_bus_ops ops;
1463
1464
1465 if (!device)
1466 return -EINVAL;
1467
1468 result = acpi_start_single_object(device);
1469 if (!result) {
1470 memset(&ops, 0, sizeof(ops));
1471 ops.acpi_op_start = 1;
1472 result = acpi_bus_scan(device, &ops);
1473 }
1474 return result;
1475 }
1476
1477 EXPORT_SYMBOL(acpi_bus_start);
1478
1479 int acpi_bus_trim(struct acpi_device *start, int rmdevice)
1480 {
1481 acpi_status status;
1482 struct acpi_device *parent, *child;
1483 acpi_handle phandle, chandle;
1484 acpi_object_type type;
1485 u32 level = 1;
1486 int err = 0;
1487
1488 parent = start;
1489 phandle = start->handle;
1490 child = chandle = NULL;
1491
1492 while ((level > 0) && parent && (!err)) {
1493 status = acpi_get_next_object(ACPI_TYPE_ANY, phandle,
1494 chandle, &chandle);
1495
1496 /*
1497 * If this scope is exhausted then move our way back up.
1498 */
1499 if (ACPI_FAILURE(status)) {
1500 level--;
1501 chandle = phandle;
1502 acpi_get_parent(phandle, &phandle);
1503 child = parent;
1504 parent = parent->parent;
1505
1506 if (level == 0)
1507 err = acpi_bus_remove(child, rmdevice);
1508 else
1509 err = acpi_bus_remove(child, 1);
1510
1511 continue;
1512 }
1513
1514 status = acpi_get_type(chandle, &type);
1515 if (ACPI_FAILURE(status)) {
1516 continue;
1517 }
1518 /*
1519 * If there is a device corresponding to chandle then
1520 * parse it (depth-first).
1521 */
1522 if (acpi_bus_get_device(chandle, &child) == 0) {
1523 level++;
1524 phandle = chandle;
1525 chandle = NULL;
1526 parent = child;
1527 }
1528 continue;
1529 }
1530 return err;
1531 }
1532 EXPORT_SYMBOL_GPL(acpi_bus_trim);
1533
1534
1535 static int acpi_bus_scan_fixed(struct acpi_device *root)
1536 {
1537 int result = 0;
1538 struct acpi_device *device = NULL;
1539 struct acpi_bus_ops ops;
1540
1541 if (!root)
1542 return -ENODEV;
1543
1544 memset(&ops, 0, sizeof(ops));
1545 ops.acpi_op_add = 1;
1546 ops.acpi_op_start = 1;
1547
1548 /*
1549 * Enumerate all fixed-feature devices.
1550 */
1551 if ((acpi_gbl_FADT.flags & ACPI_FADT_POWER_BUTTON) == 0) {
1552 result = acpi_add_single_object(&device, acpi_root,
1553 NULL,
1554 ACPI_BUS_TYPE_POWER_BUTTON,
1555 &ops);
1556 }
1557
1558 if ((acpi_gbl_FADT.flags & ACPI_FADT_SLEEP_BUTTON) == 0) {
1559 result = acpi_add_single_object(&device, acpi_root,
1560 NULL,
1561 ACPI_BUS_TYPE_SLEEP_BUTTON,
1562 &ops);
1563 }
1564
1565 return result;
1566 }
1567
1568
1569 static int __init acpi_scan_init(void)
1570 {
1571 int result;
1572 struct acpi_bus_ops ops;
1573
1574
1575 if (acpi_disabled)
1576 return 0;
1577
1578 memset(&ops, 0, sizeof(ops));
1579 ops.acpi_op_add = 1;
1580 ops.acpi_op_start = 1;
1581
1582 result = bus_register(&acpi_bus_type);
1583 if (result) {
1584 /* We don't want to quit even if we failed to add suspend/resume */
1585 printk(KERN_ERR PREFIX "Could not register bus type\n");
1586 }
1587
1588 /*
1589 * Create the root device in the bus's device tree
1590 */
1591 result = acpi_add_single_object(&acpi_root, NULL, ACPI_ROOT_OBJECT,
1592 ACPI_BUS_TYPE_SYSTEM, &ops);
1593 if (result)
1594 goto Done;
1595
1596 /*
1597 * Enumerate devices in the ACPI namespace.
1598 */
1599 result = acpi_bus_scan_fixed(acpi_root);
1600
1601 if (!result)
1602 result = acpi_bus_scan(acpi_root, &ops);
1603
1604 if (result)
1605 acpi_device_unregister(acpi_root, ACPI_BUS_REMOVAL_NORMAL);
1606
1607 Done:
1608 return result;
1609 }
1610
1611 subsys_initcall(acpi_scan_init);
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