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ACPI: convert acpi_device_lock spinlock to mutex
[linux-2.6/linux-acpi-2.6.git] / drivers / acpi / scan.c
blobe63f2febad84956d5b36fa6ff3496ad9062f8352
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->g_list);
495 INIT_LIST_HEAD(&device->wakeup_list);
496
497 new_bus_id = kzalloc(sizeof(struct acpi_device_bus_id), GFP_KERNEL);
498 if (!new_bus_id) {
499 printk(KERN_ERR PREFIX "Memory allocation error\n");
500 return -ENOMEM;
501 }
502
503 mutex_lock(&acpi_device_lock);
504 /*
505 * Find suitable bus_id and instance number in acpi_bus_id_list
506 * If failed, create one and link it into acpi_bus_id_list
507 */
508 list_for_each_entry(acpi_device_bus_id, &acpi_bus_id_list, node) {
509 if(!strcmp(acpi_device_bus_id->bus_id, device->flags.hardware_id? device->pnp.hardware_id : "device")) {
510 acpi_device_bus_id->instance_no ++;
511 found = 1;
512 kfree(new_bus_id);
513 break;
514 }
515 }
516 if(!found) {
517 acpi_device_bus_id = new_bus_id;
518 strcpy(acpi_device_bus_id->bus_id, device->flags.hardware_id ? device->pnp.hardware_id : "device");
519 acpi_device_bus_id->instance_no = 0;
520 list_add_tail(&acpi_device_bus_id->node, &acpi_bus_id_list);
521 }
522 dev_set_name(&device->dev, "%s:%02x", acpi_device_bus_id->bus_id, acpi_device_bus_id->instance_no);
523
524 if (device->parent) {
525 list_add_tail(&device->node, &device->parent->children);
526 list_add_tail(&device->g_list, &device->parent->g_list);
527 } else
528 list_add_tail(&device->g_list, &acpi_device_list);
529 if (device->wakeup.flags.valid)
530 list_add_tail(&device->wakeup_list, &acpi_wakeup_device_list);
531 mutex_unlock(&acpi_device_lock);
532
533 if (device->parent)
534 device->dev.parent = &parent->dev;
535 device->dev.bus = &acpi_bus_type;
536 device_initialize(&device->dev);
537 device->dev.release = &acpi_device_release;
538 result = device_add(&device->dev);
539 if(result) {
540 dev_err(&device->dev, "Error adding device\n");
541 goto end;
542 }
543
544 result = acpi_device_setup_files(device);
545 if(result)
546 printk(KERN_ERR PREFIX "Error creating sysfs interface for device %s\n",
547 dev_name(&device->dev));
548
549 device->removal_type = ACPI_BUS_REMOVAL_NORMAL;
550 return 0;
551 end:
552 mutex_lock(&acpi_device_lock);
553 if (device->parent) {
554 list_del(&device->node);
555 list_del(&device->g_list);
556 } else
557 list_del(&device->g_list);
558 list_del(&device->wakeup_list);
559 mutex_unlock(&acpi_device_lock);
560 return result;
561 }
562
563 static void acpi_device_unregister(struct acpi_device *device, int type)
564 {
565 mutex_lock(&acpi_device_lock);
566 if (device->parent) {
567 list_del(&device->node);
568 list_del(&device->g_list);
569 } else
570 list_del(&device->g_list);
571
572 list_del(&device->wakeup_list);
573 mutex_unlock(&acpi_device_lock);
574
575 acpi_detach_data(device->handle, acpi_bus_data_handler);
576
577 acpi_device_remove_files(device);
578 device_unregister(&device->dev);
579 }
580
581 /* --------------------------------------------------------------------------
582 Driver Management
583 -------------------------------------------------------------------------- */
584 /**
585 * acpi_bus_driver_init - add a device to a driver
586 * @device: the device to add and initialize
587 * @driver: driver for the device
588 *
589 * Used to initialize a device via its device driver. Called whenever a
590 * driver is bound to a device. Invokes the driver's add() ops.
591 */
592 static int
593 acpi_bus_driver_init(struct acpi_device *device, struct acpi_driver *driver)
594 {
595 int result = 0;
596
597
598 if (!device || !driver)
599 return -EINVAL;
600
601 if (!driver->ops.add)
602 return -ENOSYS;
603
604 result = driver->ops.add(device);
605 if (result) {
606 device->driver = NULL;
607 device->driver_data = NULL;
608 return result;
609 }
610
611 device->driver = driver;
612
613 /*
614 * TBD - Configuration Management: Assign resources to device based
615 * upon possible configuration and currently allocated resources.
616 */
617
618 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
619 "Driver successfully bound to device\n"));
620 return 0;
621 }
622
623 static int acpi_start_single_object(struct acpi_device *device)
624 {
625 int result = 0;
626 struct acpi_driver *driver;
627
628
629 if (!(driver = device->driver))
630 return 0;
631
632 if (driver->ops.start) {
633 result = driver->ops.start(device);
634 if (result && driver->ops.remove)
635 driver->ops.remove(device, ACPI_BUS_REMOVAL_NORMAL);
636 }
637
638 return result;
639 }
640
641 /**
642 * acpi_bus_register_driver - register a driver with the ACPI bus
643 * @driver: driver being registered
644 *
645 * Registers a driver with the ACPI bus. Searches the namespace for all
646 * devices that match the driver's criteria and binds. Returns zero for
647 * success or a negative error status for failure.
648 */
649 int acpi_bus_register_driver(struct acpi_driver *driver)
650 {
651 int ret;
652
653 if (acpi_disabled)
654 return -ENODEV;
655 driver->drv.name = driver->name;
656 driver->drv.bus = &acpi_bus_type;
657 driver->drv.owner = driver->owner;
658
659 ret = driver_register(&driver->drv);
660 return ret;
661 }
662
663 EXPORT_SYMBOL(acpi_bus_register_driver);
664
665 /**
666 * acpi_bus_unregister_driver - unregisters a driver with the APIC bus
667 * @driver: driver to unregister
668 *
669 * Unregisters a driver with the ACPI bus. Searches the namespace for all
670 * devices that match the driver's criteria and unbinds.
671 */
672 void acpi_bus_unregister_driver(struct acpi_driver *driver)
673 {
674 driver_unregister(&driver->drv);
675 }
676
677 EXPORT_SYMBOL(acpi_bus_unregister_driver);
678
679 /* --------------------------------------------------------------------------
680 Device Enumeration
681 -------------------------------------------------------------------------- */
682 acpi_status
683 acpi_bus_get_ejd(acpi_handle handle, acpi_handle *ejd)
684 {
685 acpi_status status;
686 acpi_handle tmp;
687 struct acpi_buffer buffer = {ACPI_ALLOCATE_BUFFER, NULL};
688 union acpi_object *obj;
689
690 status = acpi_get_handle(handle, "_EJD", &tmp);
691 if (ACPI_FAILURE(status))
692 return status;
693
694 status = acpi_evaluate_object(handle, "_EJD", NULL, &buffer);
695 if (ACPI_SUCCESS(status)) {
696 obj = buffer.pointer;
697 status = acpi_get_handle(ACPI_ROOT_OBJECT, obj->string.pointer,
698 ejd);
699 kfree(buffer.pointer);
700 }
701 return status;
702 }
703 EXPORT_SYMBOL_GPL(acpi_bus_get_ejd);
704
705 void acpi_bus_data_handler(acpi_handle handle, u32 function, void *context)
706 {
707
708 /* TBD */
709
710 return;
711 }
712
713 static int acpi_bus_get_perf_flags(struct acpi_device *device)
714 {
715 device->performance.state = ACPI_STATE_UNKNOWN;
716 return 0;
717 }
718
719 static acpi_status
720 acpi_bus_extract_wakeup_device_power_package(struct acpi_device *device,
721 union acpi_object *package)
722 {
723 int i = 0;
724 union acpi_object *element = NULL;
725
726 if (!device || !package || (package->package.count < 2))
727 return AE_BAD_PARAMETER;
728
729 element = &(package->package.elements[0]);
730 if (!element)
731 return AE_BAD_PARAMETER;
732 if (element->type == ACPI_TYPE_PACKAGE) {
733 if ((element->package.count < 2) ||
734 (element->package.elements[0].type !=
735 ACPI_TYPE_LOCAL_REFERENCE)
736 || (element->package.elements[1].type != ACPI_TYPE_INTEGER))
737 return AE_BAD_DATA;
738 device->wakeup.gpe_device =
739 element->package.elements[0].reference.handle;
740 device->wakeup.gpe_number =
741 (u32) element->package.elements[1].integer.value;
742 } else if (element->type == ACPI_TYPE_INTEGER) {
743 device->wakeup.gpe_number = element->integer.value;
744 } else
745 return AE_BAD_DATA;
746
747 element = &(package->package.elements[1]);
748 if (element->type != ACPI_TYPE_INTEGER) {
749 return AE_BAD_DATA;
750 }
751 device->wakeup.sleep_state = element->integer.value;
752
753 if ((package->package.count - 2) > ACPI_MAX_HANDLES) {
754 return AE_NO_MEMORY;
755 }
756 device->wakeup.resources.count = package->package.count - 2;
757 for (i = 0; i < device->wakeup.resources.count; i++) {
758 element = &(package->package.elements[i + 2]);
759 if (element->type != ACPI_TYPE_LOCAL_REFERENCE)
760 return AE_BAD_DATA;
761
762 device->wakeup.resources.handles[i] = element->reference.handle;
763 }
764
765 return AE_OK;
766 }
767
768 static int acpi_bus_get_wakeup_device_flags(struct acpi_device *device)
769 {
770 acpi_status status = 0;
771 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
772 union acpi_object *package = NULL;
773 int psw_error;
774
775 struct acpi_device_id button_device_ids[] = {
776 {"PNP0C0D", 0},
777 {"PNP0C0C", 0},
778 {"PNP0C0E", 0},
779 {"", 0},
780 };
781
782 /* _PRW */
783 status = acpi_evaluate_object(device->handle, "_PRW", NULL, &buffer);
784 if (ACPI_FAILURE(status)) {
785 ACPI_EXCEPTION((AE_INFO, status, "Evaluating _PRW"));
786 goto end;
787 }
788
789 package = (union acpi_object *)buffer.pointer;
790 status = acpi_bus_extract_wakeup_device_power_package(device, package);
791 if (ACPI_FAILURE(status)) {
792 ACPI_EXCEPTION((AE_INFO, status, "Extracting _PRW package"));
793 goto end;
794 }
795
796 kfree(buffer.pointer);
797
798 device->wakeup.flags.valid = 1;
799 /* Call _PSW/_DSW object to disable its ability to wake the sleeping
800 * system for the ACPI device with the _PRW object.
801 * The _PSW object is depreciated in ACPI 3.0 and is replaced by _DSW.
802 * So it is necessary to call _DSW object first. Only when it is not
803 * present will the _PSW object used.
804 */
805 psw_error = acpi_device_sleep_wake(device, 0, 0, 0);
806 if (psw_error)
807 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
808 "error in _DSW or _PSW evaluation\n"));
809
810 /* Power button, Lid switch always enable wakeup */
811 if (!acpi_match_device_ids(device, button_device_ids))
812 device->wakeup.flags.run_wake = 1;
813
814 end:
815 if (ACPI_FAILURE(status))
816 device->flags.wake_capable = 0;
817 return 0;
818 }
819
820 static int acpi_bus_get_power_flags(struct acpi_device *device)
821 {
822 acpi_status status = 0;
823 acpi_handle handle = NULL;
824 u32 i = 0;
825
826
827 /*
828 * Power Management Flags
829 */
830 status = acpi_get_handle(device->handle, "_PSC", &handle);
831 if (ACPI_SUCCESS(status))
832 device->power.flags.explicit_get = 1;
833 status = acpi_get_handle(device->handle, "_IRC", &handle);
834 if (ACPI_SUCCESS(status))
835 device->power.flags.inrush_current = 1;
836
837 /*
838 * Enumerate supported power management states
839 */
840 for (i = ACPI_STATE_D0; i <= ACPI_STATE_D3; i++) {
841 struct acpi_device_power_state *ps = &device->power.states[i];
842 char object_name[5] = { '_', 'P', 'R', '0' + i, '\0' };
843
844 /* Evaluate "_PRx" to se if power resources are referenced */
845 acpi_evaluate_reference(device->handle, object_name, NULL,
846 &ps->resources);
847 if (ps->resources.count) {
848 device->power.flags.power_resources = 1;
849 ps->flags.valid = 1;
850 }
851
852 /* Evaluate "_PSx" to see if we can do explicit sets */
853 object_name[2] = 'S';
854 status = acpi_get_handle(device->handle, object_name, &handle);
855 if (ACPI_SUCCESS(status)) {
856 ps->flags.explicit_set = 1;
857 ps->flags.valid = 1;
858 }
859
860 /* State is valid if we have some power control */
861 if (ps->resources.count || ps->flags.explicit_set)
862 ps->flags.valid = 1;
863
864 ps->power = -1; /* Unknown - driver assigned */
865 ps->latency = -1; /* Unknown - driver assigned */
866 }
867
868 /* Set defaults for D0 and D3 states (always valid) */
869 device->power.states[ACPI_STATE_D0].flags.valid = 1;
870 device->power.states[ACPI_STATE_D0].power = 100;
871 device->power.states[ACPI_STATE_D3].flags.valid = 1;
872 device->power.states[ACPI_STATE_D3].power = 0;
873
874 /* TBD: System wake support and resource requirements. */
875
876 device->power.state = ACPI_STATE_UNKNOWN;
877 acpi_bus_get_power(device->handle, &(device->power.state));
878
879 return 0;
880 }
881
882 static int acpi_bus_get_flags(struct acpi_device *device)
883 {
884 acpi_status status = AE_OK;
885 acpi_handle temp = NULL;
886
887
888 /* Presence of _STA indicates 'dynamic_status' */
889 status = acpi_get_handle(device->handle, "_STA", &temp);
890 if (ACPI_SUCCESS(status))
891 device->flags.dynamic_status = 1;
892
893 /* Presence of _CID indicates 'compatible_ids' */
894 status = acpi_get_handle(device->handle, "_CID", &temp);
895 if (ACPI_SUCCESS(status))
896 device->flags.compatible_ids = 1;
897
898 /* Presence of _RMV indicates 'removable' */
899 status = acpi_get_handle(device->handle, "_RMV", &temp);
900 if (ACPI_SUCCESS(status))
901 device->flags.removable = 1;
902
903 /* Presence of _EJD|_EJ0 indicates 'ejectable' */
904 status = acpi_get_handle(device->handle, "_EJD", &temp);
905 if (ACPI_SUCCESS(status))
906 device->flags.ejectable = 1;
907 else {
908 status = acpi_get_handle(device->handle, "_EJ0", &temp);
909 if (ACPI_SUCCESS(status))
910 device->flags.ejectable = 1;
911 }
912
913 /* Presence of _LCK indicates 'lockable' */
914 status = acpi_get_handle(device->handle, "_LCK", &temp);
915 if (ACPI_SUCCESS(status))
916 device->flags.lockable = 1;
917
918 /* Presence of _PS0|_PR0 indicates 'power manageable' */
919 status = acpi_get_handle(device->handle, "_PS0", &temp);
920 if (ACPI_FAILURE(status))
921 status = acpi_get_handle(device->handle, "_PR0", &temp);
922 if (ACPI_SUCCESS(status))
923 device->flags.power_manageable = 1;
924
925 /* Presence of _PRW indicates wake capable */
926 status = acpi_get_handle(device->handle, "_PRW", &temp);
927 if (ACPI_SUCCESS(status))
928 device->flags.wake_capable = 1;
929
930 /* TBD: Performance management */
931
932 return 0;
933 }
934
935 static void acpi_device_get_busid(struct acpi_device *device,
936 acpi_handle handle, int type)
937 {
938 char bus_id[5] = { '?', 0 };
939 struct acpi_buffer buffer = { sizeof(bus_id), bus_id };
940 int i = 0;
941
942 /*
943 * Bus ID
944 * ------
945 * The device's Bus ID is simply the object name.
946 * TBD: Shouldn't this value be unique (within the ACPI namespace)?
947 */
948 switch (type) {
949 case ACPI_BUS_TYPE_SYSTEM:
950 strcpy(device->pnp.bus_id, "ACPI");
951 break;
952 case ACPI_BUS_TYPE_POWER_BUTTON:
953 strcpy(device->pnp.bus_id, "PWRF");
954 break;
955 case ACPI_BUS_TYPE_SLEEP_BUTTON:
956 strcpy(device->pnp.bus_id, "SLPF");
957 break;
958 default:
959 acpi_get_name(handle, ACPI_SINGLE_NAME, &buffer);
960 /* Clean up trailing underscores (if any) */
961 for (i = 3; i > 1; i--) {
962 if (bus_id[i] == '_')
963 bus_id[i] = '\0';
964 else
965 break;
966 }
967 strcpy(device->pnp.bus_id, bus_id);
968 break;
969 }
970 }
971
972 /*
973 * acpi_bay_match - see if a device is an ejectable driver bay
974 *
975 * If an acpi object is ejectable and has one of the ACPI ATA methods defined,
976 * then we can safely call it an ejectable drive bay
977 */
978 static int acpi_bay_match(struct acpi_device *device){
979 acpi_status status;
980 acpi_handle handle;
981 acpi_handle tmp;
982 acpi_handle phandle;
983
984 handle = device->handle;
985
986 status = acpi_get_handle(handle, "_EJ0", &tmp);
987 if (ACPI_FAILURE(status))
988 return -ENODEV;
989
990 if ((ACPI_SUCCESS(acpi_get_handle(handle, "_GTF", &tmp))) ||
991 (ACPI_SUCCESS(acpi_get_handle(handle, "_GTM", &tmp))) ||
992 (ACPI_SUCCESS(acpi_get_handle(handle, "_STM", &tmp))) ||
993 (ACPI_SUCCESS(acpi_get_handle(handle, "_SDD", &tmp))))
994 return 0;
995
996 if (acpi_get_parent(handle, &phandle))
997 return -ENODEV;
998
999 if ((ACPI_SUCCESS(acpi_get_handle(phandle, "_GTF", &tmp))) ||
1000 (ACPI_SUCCESS(acpi_get_handle(phandle, "_GTM", &tmp))) ||
1001 (ACPI_SUCCESS(acpi_get_handle(phandle, "_STM", &tmp))) ||
1002 (ACPI_SUCCESS(acpi_get_handle(phandle, "_SDD", &tmp))))
1003 return 0;
1004
1005 return -ENODEV;
1006 }
1007
1008 /*
1009 * acpi_dock_match - see if a device has a _DCK method
1010 */
1011 static int acpi_dock_match(struct acpi_device *device)
1012 {
1013 acpi_handle tmp;
1014 return acpi_get_handle(device->handle, "_DCK", &tmp);
1015 }
1016
1017 static void acpi_device_set_id(struct acpi_device *device,
1018 struct acpi_device *parent, acpi_handle handle,
1019 int type)
1020 {
1021 struct acpi_device_info *info;
1022 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
1023 char *hid = NULL;
1024 char *uid = NULL;
1025 struct acpi_compatible_id_list *cid_list = NULL;
1026 const char *cid_add = NULL;
1027 acpi_status status;
1028
1029 switch (type) {
1030 case ACPI_BUS_TYPE_DEVICE:
1031 status = acpi_get_object_info(handle, &buffer);
1032 if (ACPI_FAILURE(status)) {
1033 printk(KERN_ERR PREFIX "%s: Error reading device info\n", __func__);
1034 return;
1035 }
1036
1037 info = buffer.pointer;
1038 if (info->valid & ACPI_VALID_HID)
1039 hid = info->hardware_id.value;
1040 if (info->valid & ACPI_VALID_UID)
1041 uid = info->unique_id.value;
1042 if (info->valid & ACPI_VALID_CID)
1043 cid_list = &info->compatibility_id;
1044 if (info->valid & ACPI_VALID_ADR) {
1045 device->pnp.bus_address = info->address;
1046 device->flags.bus_address = 1;
1047 }
1048
1049 /* If we have a video/bay/dock device, add our selfdefined
1050 HID to the CID list. Like that the video/bay/dock drivers
1051 will get autoloaded and the device might still match
1052 against another driver.
1053 */
1054 if (acpi_is_video_device(device))
1055 cid_add = ACPI_VIDEO_HID;
1056 else if (ACPI_SUCCESS(acpi_bay_match(device)))
1057 cid_add = ACPI_BAY_HID;
1058 else if (ACPI_SUCCESS(acpi_dock_match(device)))
1059 cid_add = ACPI_DOCK_HID;
1060
1061 break;
1062 case ACPI_BUS_TYPE_POWER:
1063 hid = ACPI_POWER_HID;
1064 break;
1065 case ACPI_BUS_TYPE_PROCESSOR:
1066 hid = ACPI_PROCESSOR_OBJECT_HID;
1067 break;
1068 case ACPI_BUS_TYPE_SYSTEM:
1069 hid = ACPI_SYSTEM_HID;
1070 break;
1071 case ACPI_BUS_TYPE_THERMAL:
1072 hid = ACPI_THERMAL_HID;
1073 break;
1074 case ACPI_BUS_TYPE_POWER_BUTTON:
1075 hid = ACPI_BUTTON_HID_POWERF;
1076 break;
1077 case ACPI_BUS_TYPE_SLEEP_BUTTON:
1078 hid = ACPI_BUTTON_HID_SLEEPF;
1079 break;
1080 }
1081
1082 /*
1083 * \_SB
1084 * ----
1085 * Fix for the system root bus device -- the only root-level device.
1086 */
1087 if (((acpi_handle)parent == ACPI_ROOT_OBJECT) && (type == ACPI_BUS_TYPE_DEVICE)) {
1088 hid = ACPI_BUS_HID;
1089 strcpy(device->pnp.device_name, ACPI_BUS_DEVICE_NAME);
1090 strcpy(device->pnp.device_class, ACPI_BUS_CLASS);
1091 }
1092
1093 if (hid) {
1094 strcpy(device->pnp.hardware_id, hid);
1095 device->flags.hardware_id = 1;
1096 }
1097 if (uid) {
1098 strcpy(device->pnp.unique_id, uid);
1099 device->flags.unique_id = 1;
1100 }
1101 if (cid_list || cid_add) {
1102 struct acpi_compatible_id_list *list;
1103 int size = 0;
1104 int count = 0;
1105
1106 if (cid_list) {
1107 size = cid_list->size;
1108 } else if (cid_add) {
1109 size = sizeof(struct acpi_compatible_id_list);
1110 cid_list = ACPI_ALLOCATE_ZEROED((acpi_size) size);
1111 if (!cid_list) {
1112 printk(KERN_ERR "Memory allocation error\n");
1113 kfree(buffer.pointer);
1114 return;
1115 } else {
1116 cid_list->count = 0;
1117 cid_list->size = size;
1118 }
1119 }
1120 if (cid_add)
1121 size += sizeof(struct acpi_compatible_id);
1122 list = kmalloc(size, GFP_KERNEL);
1123
1124 if (list) {
1125 if (cid_list) {
1126 memcpy(list, cid_list, cid_list->size);
1127 count = cid_list->count;
1128 }
1129 if (cid_add) {
1130 strncpy(list->id[count].value, cid_add,
1131 ACPI_MAX_CID_LENGTH);
1132 count++;
1133 device->flags.compatible_ids = 1;
1134 }
1135 list->size = size;
1136 list->count = count;
1137 device->pnp.cid_list = list;
1138 } else
1139 printk(KERN_ERR PREFIX "Memory allocation error\n");
1140 }
1141
1142 kfree(buffer.pointer);
1143 }
1144
1145 static int acpi_device_set_context(struct acpi_device *device, int type)
1146 {
1147 acpi_status status = AE_OK;
1148 int result = 0;
1149 /*
1150 * Context
1151 * -------
1152 * Attach this 'struct acpi_device' to the ACPI object. This makes
1153 * resolutions from handle->device very efficient. Note that we need
1154 * to be careful with fixed-feature devices as they all attach to the
1155 * root object.
1156 */
1157 if (type != ACPI_BUS_TYPE_POWER_BUTTON &&
1158 type != ACPI_BUS_TYPE_SLEEP_BUTTON) {
1159 status = acpi_attach_data(device->handle,
1160 acpi_bus_data_handler, device);
1161
1162 if (ACPI_FAILURE(status)) {
1163 printk(KERN_ERR PREFIX "Error attaching device data\n");
1164 result = -ENODEV;
1165 }
1166 }
1167 return result;
1168 }
1169
1170 static int acpi_bus_remove(struct acpi_device *dev, int rmdevice)
1171 {
1172 if (!dev)
1173 return -EINVAL;
1174
1175 dev->removal_type = ACPI_BUS_REMOVAL_EJECT;
1176 device_release_driver(&dev->dev);
1177
1178 if (!rmdevice)
1179 return 0;
1180
1181 /*
1182 * unbind _ADR-Based Devices when hot removal
1183 */
1184 if (dev->flags.bus_address) {
1185 if ((dev->parent) && (dev->parent->ops.unbind))
1186 dev->parent->ops.unbind(dev);
1187 }
1188 acpi_device_unregister(dev, ACPI_BUS_REMOVAL_EJECT);
1189
1190 return 0;
1191 }
1192
1193 static int
1194 acpi_add_single_object(struct acpi_device **child,
1195 struct acpi_device *parent, acpi_handle handle, int type,
1196 struct acpi_bus_ops *ops)
1197 {
1198 int result = 0;
1199 struct acpi_device *device = NULL;
1200
1201
1202 if (!child)
1203 return -EINVAL;
1204
1205 device = kzalloc(sizeof(struct acpi_device), GFP_KERNEL);
1206 if (!device) {
1207 printk(KERN_ERR PREFIX "Memory allocation error\n");
1208 return -ENOMEM;
1209 }
1210
1211 device->handle = handle;
1212 device->parent = parent;
1213 device->bus_ops = *ops; /* workround for not call .start */
1214
1215
1216 acpi_device_get_busid(device, handle, type);
1217
1218 /*
1219 * Flags
1220 * -----
1221 * Get prior to calling acpi_bus_get_status() so we know whether
1222 * or not _STA is present. Note that we only look for object
1223 * handles -- cannot evaluate objects until we know the device is
1224 * present and properly initialized.
1225 */
1226 result = acpi_bus_get_flags(device);
1227 if (result)
1228 goto end;
1229
1230 /*
1231 * Status
1232 * ------
1233 * See if the device is present. We always assume that non-Device
1234 * and non-Processor objects (e.g. thermal zones, power resources,
1235 * etc.) are present, functioning, etc. (at least when parent object
1236 * is present). Note that _STA has a different meaning for some
1237 * objects (e.g. power resources) so we need to be careful how we use
1238 * it.
1239 */
1240 switch (type) {
1241 case ACPI_BUS_TYPE_PROCESSOR:
1242 case ACPI_BUS_TYPE_DEVICE:
1243 result = acpi_bus_get_status(device);
1244 if (ACPI_FAILURE(result)) {
1245 result = -ENODEV;
1246 goto end;
1247 }
1248 /*
1249 * When the device is neither present nor functional, the
1250 * device should not be added to Linux ACPI device tree.
1251 * When the status of the device is not present but functinal,
1252 * it should be added to Linux ACPI tree. For example : bay
1253 * device , dock device.
1254 * In such conditions it is unncessary to check whether it is
1255 * bay device or dock device.
1256 */
1257 if (!device->status.present && !device->status.functional) {
1258 result = -ENODEV;
1259 goto end;
1260 }
1261 break;
1262 default:
1263 STRUCT_TO_INT(device->status) =
1264 ACPI_STA_DEVICE_PRESENT | ACPI_STA_DEVICE_ENABLED |
1265 ACPI_STA_DEVICE_UI | ACPI_STA_DEVICE_FUNCTIONING;
1266 break;
1267 }
1268
1269 /*
1270 * Initialize Device
1271 * -----------------
1272 * TBD: Synch with Core's enumeration/initialization process.
1273 */
1274
1275 /*
1276 * Hardware ID, Unique ID, & Bus Address
1277 * -------------------------------------
1278 */
1279 acpi_device_set_id(device, parent, handle, type);
1280
1281 /*
1282 * The ACPI device is attached to acpi handle before getting
1283 * the power/wakeup/peformance flags. Otherwise OS can't get
1284 * the corresponding ACPI device by the acpi handle in the course
1285 * of getting the power/wakeup/performance flags.
1286 */
1287 result = acpi_device_set_context(device, type);
1288 if (result)
1289 goto end;
1290
1291 /*
1292 * Power Management
1293 * ----------------
1294 */
1295 if (device->flags.power_manageable) {
1296 result = acpi_bus_get_power_flags(device);
1297 if (result)
1298 goto end;
1299 }
1300
1301 /*
1302 * Wakeup device management
1303 *-----------------------
1304 */
1305 if (device->flags.wake_capable) {
1306 result = acpi_bus_get_wakeup_device_flags(device);
1307 if (result)
1308 goto end;
1309 }
1310
1311 /*
1312 * Performance Management
1313 * ----------------------
1314 */
1315 if (device->flags.performance_manageable) {
1316 result = acpi_bus_get_perf_flags(device);
1317 if (result)
1318 goto end;
1319 }
1320
1321
1322 result = acpi_device_register(device, parent);
1323
1324 /*
1325 * Bind _ADR-Based Devices when hot add
1326 */
1327 if (device->flags.bus_address) {
1328 if (device->parent && device->parent->ops.bind)
1329 device->parent->ops.bind(device);
1330 }
1331
1332 end:
1333 if (!result)
1334 *child = device;
1335 else {
1336 kfree(device->pnp.cid_list);
1337 kfree(device);
1338 }
1339
1340 return result;
1341 }
1342
1343 static int acpi_bus_scan(struct acpi_device *start, struct acpi_bus_ops *ops)
1344 {
1345 acpi_status status = AE_OK;
1346 struct acpi_device *parent = NULL;
1347 struct acpi_device *child = NULL;
1348 acpi_handle phandle = NULL;
1349 acpi_handle chandle = NULL;
1350 acpi_object_type type = 0;
1351 u32 level = 1;
1352
1353
1354 if (!start)
1355 return -EINVAL;
1356
1357 parent = start;
1358 phandle = start->handle;
1359
1360 /*
1361 * Parse through the ACPI namespace, identify all 'devices', and
1362 * create a new 'struct acpi_device' for each.
1363 */
1364 while ((level > 0) && parent) {
1365
1366 status = acpi_get_next_object(ACPI_TYPE_ANY, phandle,
1367 chandle, &chandle);
1368
1369 /*
1370 * If this scope is exhausted then move our way back up.
1371 */
1372 if (ACPI_FAILURE(status)) {
1373 level--;
1374 chandle = phandle;
1375 acpi_get_parent(phandle, &phandle);
1376 if (parent->parent)
1377 parent = parent->parent;
1378 continue;
1379 }
1380
1381 status = acpi_get_type(chandle, &type);
1382 if (ACPI_FAILURE(status))
1383 continue;
1384
1385 /*
1386 * If this is a scope object then parse it (depth-first).
1387 */
1388 if (type == ACPI_TYPE_LOCAL_SCOPE) {
1389 level++;
1390 phandle = chandle;
1391 chandle = NULL;
1392 continue;
1393 }
1394
1395 /*
1396 * We're only interested in objects that we consider 'devices'.
1397 */
1398 switch (type) {
1399 case ACPI_TYPE_DEVICE:
1400 type = ACPI_BUS_TYPE_DEVICE;
1401 break;
1402 case ACPI_TYPE_PROCESSOR:
1403 type = ACPI_BUS_TYPE_PROCESSOR;
1404 break;
1405 case ACPI_TYPE_THERMAL:
1406 type = ACPI_BUS_TYPE_THERMAL;
1407 break;
1408 case ACPI_TYPE_POWER:
1409 type = ACPI_BUS_TYPE_POWER;
1410 break;
1411 default:
1412 continue;
1413 }
1414
1415 if (ops->acpi_op_add)
1416 status = acpi_add_single_object(&child, parent,
1417 chandle, type, ops);
1418 else
1419 status = acpi_bus_get_device(chandle, &child);
1420
1421 if (ACPI_FAILURE(status))
1422 continue;
1423
1424 if (ops->acpi_op_start && !(ops->acpi_op_add)) {
1425 status = acpi_start_single_object(child);
1426 if (ACPI_FAILURE(status))
1427 continue;
1428 }
1429
1430 /*
1431 * If the device is present, enabled, and functioning then
1432 * parse its scope (depth-first). Note that we need to
1433 * represent absent devices to facilitate PnP notifications
1434 * -- but only the subtree head (not all of its children,
1435 * which will be enumerated when the parent is inserted).
1436 *
1437 * TBD: Need notifications and other detection mechanisms
1438 * in place before we can fully implement this.
1439 */
1440 /*
1441 * When the device is not present but functional, it is also
1442 * necessary to scan the children of this device.
1443 */
1444 if (child->status.present || (!child->status.present &&
1445 child->status.functional)) {
1446 status = acpi_get_next_object(ACPI_TYPE_ANY, chandle,
1447 NULL, NULL);
1448 if (ACPI_SUCCESS(status)) {
1449 level++;
1450 phandle = chandle;
1451 chandle = NULL;
1452 parent = child;
1453 }
1454 }
1455 }
1456
1457 return 0;
1458 }
1459
1460 int
1461 acpi_bus_add(struct acpi_device **child,
1462 struct acpi_device *parent, acpi_handle handle, int type)
1463 {
1464 int result;
1465 struct acpi_bus_ops ops;
1466
1467 memset(&ops, 0, sizeof(ops));
1468 ops.acpi_op_add = 1;
1469
1470 result = acpi_add_single_object(child, parent, handle, type, &ops);
1471 if (!result)
1472 result = acpi_bus_scan(*child, &ops);
1473
1474 return result;
1475 }
1476
1477 EXPORT_SYMBOL(acpi_bus_add);
1478
1479 int acpi_bus_start(struct acpi_device *device)
1480 {
1481 int result;
1482 struct acpi_bus_ops ops;
1483
1484
1485 if (!device)
1486 return -EINVAL;
1487
1488 result = acpi_start_single_object(device);
1489 if (!result) {
1490 memset(&ops, 0, sizeof(ops));
1491 ops.acpi_op_start = 1;
1492 result = acpi_bus_scan(device, &ops);
1493 }
1494 return result;
1495 }
1496
1497 EXPORT_SYMBOL(acpi_bus_start);
1498
1499 int acpi_bus_trim(struct acpi_device *start, int rmdevice)
1500 {
1501 acpi_status status;
1502 struct acpi_device *parent, *child;
1503 acpi_handle phandle, chandle;
1504 acpi_object_type type;
1505 u32 level = 1;
1506 int err = 0;
1507
1508 parent = start;
1509 phandle = start->handle;
1510 child = chandle = NULL;
1511
1512 while ((level > 0) && parent && (!err)) {
1513 status = acpi_get_next_object(ACPI_TYPE_ANY, phandle,
1514 chandle, &chandle);
1515
1516 /*
1517 * If this scope is exhausted then move our way back up.
1518 */
1519 if (ACPI_FAILURE(status)) {
1520 level--;
1521 chandle = phandle;
1522 acpi_get_parent(phandle, &phandle);
1523 child = parent;
1524 parent = parent->parent;
1525
1526 if (level == 0)
1527 err = acpi_bus_remove(child, rmdevice);
1528 else
1529 err = acpi_bus_remove(child, 1);
1530
1531 continue;
1532 }
1533
1534 status = acpi_get_type(chandle, &type);
1535 if (ACPI_FAILURE(status)) {
1536 continue;
1537 }
1538 /*
1539 * If there is a device corresponding to chandle then
1540 * parse it (depth-first).
1541 */
1542 if (acpi_bus_get_device(chandle, &child) == 0) {
1543 level++;
1544 phandle = chandle;
1545 chandle = NULL;
1546 parent = child;
1547 }
1548 continue;
1549 }
1550 return err;
1551 }
1552 EXPORT_SYMBOL_GPL(acpi_bus_trim);
1553
1554
1555 static int acpi_bus_scan_fixed(struct acpi_device *root)
1556 {
1557 int result = 0;
1558 struct acpi_device *device = NULL;
1559 struct acpi_bus_ops ops;
1560
1561 if (!root)
1562 return -ENODEV;
1563
1564 memset(&ops, 0, sizeof(ops));
1565 ops.acpi_op_add = 1;
1566 ops.acpi_op_start = 1;
1567
1568 /*
1569 * Enumerate all fixed-feature devices.
1570 */
1571 if ((acpi_gbl_FADT.flags & ACPI_FADT_POWER_BUTTON) == 0) {
1572 result = acpi_add_single_object(&device, acpi_root,
1573 NULL,
1574 ACPI_BUS_TYPE_POWER_BUTTON,
1575 &ops);
1576 }
1577
1578 if ((acpi_gbl_FADT.flags & ACPI_FADT_SLEEP_BUTTON) == 0) {
1579 result = acpi_add_single_object(&device, acpi_root,
1580 NULL,
1581 ACPI_BUS_TYPE_SLEEP_BUTTON,
1582 &ops);
1583 }
1584
1585 return result;
1586 }
1587
1588 int __init acpi_scan_init(void)
1589 {
1590 int result;
1591 struct acpi_bus_ops ops;
1592
1593 memset(&ops, 0, sizeof(ops));
1594 ops.acpi_op_add = 1;
1595 ops.acpi_op_start = 1;
1596
1597 result = bus_register(&acpi_bus_type);
1598 if (result) {
1599 /* We don't want to quit even if we failed to add suspend/resume */
1600 printk(KERN_ERR PREFIX "Could not register bus type\n");
1601 }
1602
1603 /*
1604 * Create the root device in the bus's device tree
1605 */
1606 result = acpi_add_single_object(&acpi_root, NULL, ACPI_ROOT_OBJECT,
1607 ACPI_BUS_TYPE_SYSTEM, &ops);
1608 if (result)
1609 goto Done;
1610
1611 /*
1612 * Enumerate devices in the ACPI namespace.
1613 */
1614 result = acpi_bus_scan_fixed(acpi_root);
1615
1616 if (!result)
1617 result = acpi_bus_scan(acpi_root, &ops);
1618
1619 if (result)
1620 acpi_device_unregister(acpi_root, ACPI_BUS_REMOVAL_NORMAL);
1621
1622 Done:
1623 return result;
1624 }
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