?  search:
summary | log | graphiclog1 | graphiclog2 | commit | commitdiff | tree | refs | edit | fork
blame | history | raw | HEAD
cyclades: merge cy_startup tails
[linux-2.6/linux-acpi-2.6/ibm-acpi-2.6.git] / drivers / acpi / scan.c
blob318b1ea7a5bf4c9df8a35bb251d7773a5a296b39
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 void 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;
108
109 if (!device)
110 return;
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;
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 printk(KERN_WARNING PREFIX
146 "Eject device failed\n");
147
148 return;
149 }
150
151 static ssize_t
152 acpi_eject_store(struct device *d, struct device_attribute *attr,
153 const char *buf, size_t count)
154 {
155 int ret = count;
156 acpi_status status;
157 acpi_object_type type = 0;
158 struct acpi_device *acpi_device = to_acpi_device(d);
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 acpi_os_hotplug_execute(acpi_bus_hot_remove_device, acpi_device->handle);
176 err:
177 return ret;
178 }
179
180 static DEVICE_ATTR(eject, 0200, NULL, acpi_eject_store);
181
182 static ssize_t
183 acpi_device_hid_show(struct device *dev, struct device_attribute *attr, char *buf) {
184 struct acpi_device *acpi_dev = to_acpi_device(dev);
185
186 return sprintf(buf, "%s\n", acpi_dev->pnp.hardware_id);
187 }
188 static DEVICE_ATTR(hid, 0444, acpi_device_hid_show, NULL);
189
190 static ssize_t
191 acpi_device_path_show(struct device *dev, struct device_attribute *attr, char *buf) {
192 struct acpi_device *acpi_dev = to_acpi_device(dev);
193 struct acpi_buffer path = {ACPI_ALLOCATE_BUFFER, NULL};
194 int result;
195
196 result = acpi_get_name(acpi_dev->handle, ACPI_FULL_PATHNAME, &path);
197 if (result)
198 goto end;
199
200 result = sprintf(buf, "%s\n", (char*)path.pointer);
201 kfree(path.pointer);
202 end:
203 return result;
204 }
205 static DEVICE_ATTR(path, 0444, acpi_device_path_show, NULL);
206
207 static int acpi_device_setup_files(struct acpi_device *dev)
208 {
209 acpi_status status;
210 acpi_handle temp;
211 int result = 0;
212
213 /*
214 * Devices gotten from FADT don't have a "path" attribute
215 */
216 if (dev->handle) {
217 result = device_create_file(&dev->dev, &dev_attr_path);
218 if (result)
219 goto end;
220 }
221
222 if (dev->flags.hardware_id) {
223 result = device_create_file(&dev->dev, &dev_attr_hid);
224 if (result)
225 goto end;
226 }
227
228 if (dev->flags.hardware_id || dev->flags.compatible_ids) {
229 result = device_create_file(&dev->dev, &dev_attr_modalias);
230 if (result)
231 goto end;
232 }
233
234 /*
235 * If device has _EJ0, 'eject' file is created that is used to trigger
236 * hot-removal function from userland.
237 */
238 status = acpi_get_handle(dev->handle, "_EJ0", &temp);
239 if (ACPI_SUCCESS(status))
240 result = device_create_file(&dev->dev, &dev_attr_eject);
241 end:
242 return result;
243 }
244
245 static void acpi_device_remove_files(struct acpi_device *dev)
246 {
247 acpi_status status;
248 acpi_handle temp;
249
250 /*
251 * If device has _EJ0, 'eject' file is created that is used to trigger
252 * hot-removal function from userland.
253 */
254 status = acpi_get_handle(dev->handle, "_EJ0", &temp);
255 if (ACPI_SUCCESS(status))
256 device_remove_file(&dev->dev, &dev_attr_eject);
257
258 if (dev->flags.hardware_id || dev->flags.compatible_ids)
259 device_remove_file(&dev->dev, &dev_attr_modalias);
260
261 if (dev->flags.hardware_id)
262 device_remove_file(&dev->dev, &dev_attr_hid);
263 if (dev->handle)
264 device_remove_file(&dev->dev, &dev_attr_path);
265 }
266 /* --------------------------------------------------------------------------
267 ACPI Bus operations
268 -------------------------------------------------------------------------- */
269
270 int acpi_match_device_ids(struct acpi_device *device,
271 const struct acpi_device_id *ids)
272 {
273 const struct acpi_device_id *id;
274
275 /*
276 * If the device is not present, it is unnecessary to load device
277 * driver for it.
278 */
279 if (!device->status.present)
280 return -ENODEV;
281
282 if (device->flags.hardware_id) {
283 for (id = ids; id->id[0]; id++) {
284 if (!strcmp((char*)id->id, device->pnp.hardware_id))
285 return 0;
286 }
287 }
288
289 if (device->flags.compatible_ids) {
290 struct acpi_compatible_id_list *cid_list = device->pnp.cid_list;
291 int i;
292
293 for (id = ids; id->id[0]; id++) {
294 /* compare multiple _CID entries against driver ids */
295 for (i = 0; i < cid_list->count; i++) {
296 if (!strcmp((char*)id->id,
297 cid_list->id[i].value))
298 return 0;
299 }
300 }
301 }
302
303 return -ENOENT;
304 }
305 EXPORT_SYMBOL(acpi_match_device_ids);
306
307 static void acpi_device_release(struct device *dev)
308 {
309 struct acpi_device *acpi_dev = to_acpi_device(dev);
310
311 kfree(acpi_dev->pnp.cid_list);
312 kfree(acpi_dev);
313 }
314
315 static int acpi_device_suspend(struct device *dev, pm_message_t state)
316 {
317 struct acpi_device *acpi_dev = to_acpi_device(dev);
318 struct acpi_driver *acpi_drv = acpi_dev->driver;
319
320 if (acpi_drv && acpi_drv->ops.suspend)
321 return acpi_drv->ops.suspend(acpi_dev, state);
322 return 0;
323 }
324
325 static int acpi_device_resume(struct device *dev)
326 {
327 struct acpi_device *acpi_dev = to_acpi_device(dev);
328 struct acpi_driver *acpi_drv = acpi_dev->driver;
329
330 if (acpi_drv && acpi_drv->ops.resume)
331 return acpi_drv->ops.resume(acpi_dev);
332 return 0;
333 }
334
335 static int acpi_bus_match(struct device *dev, struct device_driver *drv)
336 {
337 struct acpi_device *acpi_dev = to_acpi_device(dev);
338 struct acpi_driver *acpi_drv = to_acpi_driver(drv);
339
340 return !acpi_match_device_ids(acpi_dev, acpi_drv->ids);
341 }
342
343 static int acpi_device_uevent(struct device *dev, struct kobj_uevent_env *env)
344 {
345 struct acpi_device *acpi_dev = to_acpi_device(dev);
346 int len;
347
348 if (add_uevent_var(env, "MODALIAS="))
349 return -ENOMEM;
350 len = create_modalias(acpi_dev, &env->buf[env->buflen - 1],
351 sizeof(env->buf) - env->buflen);
352 if (len >= (sizeof(env->buf) - env->buflen))
353 return -ENOMEM;
354 env->buflen += len;
355 return 0;
356 }
357
358 static void acpi_device_notify(acpi_handle handle, u32 event, void *data)
359 {
360 struct acpi_device *device = data;
361
362 device->driver->ops.notify(device, event);
363 }
364
365 static acpi_status acpi_device_notify_fixed(void *data)
366 {
367 struct acpi_device *device = data;
368
369 acpi_device_notify(device->handle, ACPI_FIXED_HARDWARE_EVENT, device);
370 return AE_OK;
371 }
372
373 static int acpi_device_install_notify_handler(struct acpi_device *device)
374 {
375 acpi_status status;
376 char *hid;
377
378 hid = acpi_device_hid(device);
379 if (!strcmp(hid, ACPI_BUTTON_HID_POWERF))
380 status =
381 acpi_install_fixed_event_handler(ACPI_EVENT_POWER_BUTTON,
382 acpi_device_notify_fixed,
383 device);
384 else if (!strcmp(hid, ACPI_BUTTON_HID_SLEEPF))
385 status =
386 acpi_install_fixed_event_handler(ACPI_EVENT_SLEEP_BUTTON,
387 acpi_device_notify_fixed,
388 device);
389 else
390 status = acpi_install_notify_handler(device->handle,
391 ACPI_DEVICE_NOTIFY,
392 acpi_device_notify,
393 device);
394
395 if (ACPI_FAILURE(status))
396 return -EINVAL;
397 return 0;
398 }
399
400 static void acpi_device_remove_notify_handler(struct acpi_device *device)
401 {
402 if (!strcmp(acpi_device_hid(device), ACPI_BUTTON_HID_POWERF))
403 acpi_remove_fixed_event_handler(ACPI_EVENT_POWER_BUTTON,
404 acpi_device_notify_fixed);
405 else if (!strcmp(acpi_device_hid(device), ACPI_BUTTON_HID_SLEEPF))
406 acpi_remove_fixed_event_handler(ACPI_EVENT_SLEEP_BUTTON,
407 acpi_device_notify_fixed);
408 else
409 acpi_remove_notify_handler(device->handle, ACPI_DEVICE_NOTIFY,
410 acpi_device_notify);
411 }
412
413 static int acpi_bus_driver_init(struct acpi_device *, struct acpi_driver *);
414 static int acpi_start_single_object(struct acpi_device *);
415 static int acpi_device_probe(struct device * dev)
416 {
417 struct acpi_device *acpi_dev = to_acpi_device(dev);
418 struct acpi_driver *acpi_drv = to_acpi_driver(dev->driver);
419 int ret;
420
421 ret = acpi_bus_driver_init(acpi_dev, acpi_drv);
422 if (!ret) {
423 if (acpi_dev->bus_ops.acpi_op_start)
424 acpi_start_single_object(acpi_dev);
425
426 if (acpi_drv->ops.notify) {
427 ret = acpi_device_install_notify_handler(acpi_dev);
428 if (ret) {
429 if (acpi_drv->ops.stop)
430 acpi_drv->ops.stop(acpi_dev,
431 acpi_dev->removal_type);
432 if (acpi_drv->ops.remove)
433 acpi_drv->ops.remove(acpi_dev,
434 acpi_dev->removal_type);
435 return ret;
436 }
437 }
438
439 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
440 "Found driver [%s] for device [%s]\n",
441 acpi_drv->name, acpi_dev->pnp.bus_id));
442 get_device(dev);
443 }
444 return ret;
445 }
446
447 static int acpi_device_remove(struct device * dev)
448 {
449 struct acpi_device *acpi_dev = to_acpi_device(dev);
450 struct acpi_driver *acpi_drv = acpi_dev->driver;
451
452 if (acpi_drv) {
453 if (acpi_drv->ops.notify)
454 acpi_device_remove_notify_handler(acpi_dev);
455 if (acpi_drv->ops.stop)
456 acpi_drv->ops.stop(acpi_dev, acpi_dev->removal_type);
457 if (acpi_drv->ops.remove)
458 acpi_drv->ops.remove(acpi_dev, acpi_dev->removal_type);
459 }
460 acpi_dev->driver = NULL;
461 acpi_dev->driver_data = NULL;
462
463 put_device(dev);
464 return 0;
465 }
466
467 struct bus_type acpi_bus_type = {
468 .name = "acpi",
469 .suspend = acpi_device_suspend,
470 .resume = acpi_device_resume,
471 .match = acpi_bus_match,
472 .probe = acpi_device_probe,
473 .remove = acpi_device_remove,
474 .uevent = acpi_device_uevent,
475 };
476
477 static int acpi_device_register(struct acpi_device *device,
478 struct acpi_device *parent)
479 {
480 int result;
481 struct acpi_device_bus_id *acpi_device_bus_id, *new_bus_id;
482 int found = 0;
483 /*
484 * Linkage
485 * -------
486 * Link this device to its parent and siblings.
487 */
488 INIT_LIST_HEAD(&device->children);
489 INIT_LIST_HEAD(&device->node);
490 INIT_LIST_HEAD(&device->wakeup_list);
491
492 new_bus_id = kzalloc(sizeof(struct acpi_device_bus_id), GFP_KERNEL);
493 if (!new_bus_id) {
494 printk(KERN_ERR PREFIX "Memory allocation error\n");
495 return -ENOMEM;
496 }
497
498 mutex_lock(&acpi_device_lock);
499 /*
500 * Find suitable bus_id and instance number in acpi_bus_id_list
501 * If failed, create one and link it into acpi_bus_id_list
502 */
503 list_for_each_entry(acpi_device_bus_id, &acpi_bus_id_list, node) {
504 if(!strcmp(acpi_device_bus_id->bus_id, device->flags.hardware_id? device->pnp.hardware_id : "device")) {
505 acpi_device_bus_id->instance_no ++;
506 found = 1;
507 kfree(new_bus_id);
508 break;
509 }
510 }
511 if (!found) {
512 acpi_device_bus_id = new_bus_id;
513 strcpy(acpi_device_bus_id->bus_id, device->flags.hardware_id ? device->pnp.hardware_id : "device");
514 acpi_device_bus_id->instance_no = 0;
515 list_add_tail(&acpi_device_bus_id->node, &acpi_bus_id_list);
516 }
517 dev_set_name(&device->dev, "%s:%02x", acpi_device_bus_id->bus_id, acpi_device_bus_id->instance_no);
518
519 if (device->parent)
520 list_add_tail(&device->node, &device->parent->children);
521
522 if (device->wakeup.flags.valid)
523 list_add_tail(&device->wakeup_list, &acpi_wakeup_device_list);
524 mutex_unlock(&acpi_device_lock);
525
526 if (device->parent)
527 device->dev.parent = &parent->dev;
528 device->dev.bus = &acpi_bus_type;
529 device->dev.release = &acpi_device_release;
530 result = device_register(&device->dev);
531 if (result) {
532 dev_err(&device->dev, "Error registering device\n");
533 goto end;
534 }
535
536 result = acpi_device_setup_files(device);
537 if (result)
538 printk(KERN_ERR PREFIX "Error creating sysfs interface for device %s\n",
539 dev_name(&device->dev));
540
541 device->removal_type = ACPI_BUS_REMOVAL_NORMAL;
542 return 0;
543 end:
544 mutex_lock(&acpi_device_lock);
545 if (device->parent)
546 list_del(&device->node);
547 list_del(&device->wakeup_list);
548 mutex_unlock(&acpi_device_lock);
549 return result;
550 }
551
552 static void acpi_device_unregister(struct acpi_device *device, int type)
553 {
554 mutex_lock(&acpi_device_lock);
555 if (device->parent)
556 list_del(&device->node);
557
558 list_del(&device->wakeup_list);
559 mutex_unlock(&acpi_device_lock);
560
561 acpi_detach_data(device->handle, acpi_bus_data_handler);
562
563 acpi_device_remove_files(device);
564 device_unregister(&device->dev);
565 }
566
567 /* --------------------------------------------------------------------------
568 Driver Management
569 -------------------------------------------------------------------------- */
570 /**
571 * acpi_bus_driver_init - add a device to a driver
572 * @device: the device to add and initialize
573 * @driver: driver for the device
574 *
575 * Used to initialize a device via its device driver. Called whenever a
576 * driver is bound to a device. Invokes the driver's add() ops.
577 */
578 static int
579 acpi_bus_driver_init(struct acpi_device *device, struct acpi_driver *driver)
580 {
581 int result = 0;
582
583 if (!device || !driver)
584 return -EINVAL;
585
586 if (!driver->ops.add)
587 return -ENOSYS;
588
589 result = driver->ops.add(device);
590 if (result) {
591 device->driver = NULL;
592 device->driver_data = NULL;
593 return result;
594 }
595
596 device->driver = driver;
597
598 /*
599 * TBD - Configuration Management: Assign resources to device based
600 * upon possible configuration and currently allocated resources.
601 */
602
603 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
604 "Driver successfully bound to device\n"));
605 return 0;
606 }
607
608 static int acpi_start_single_object(struct acpi_device *device)
609 {
610 int result = 0;
611 struct acpi_driver *driver;
612
613
614 if (!(driver = device->driver))
615 return 0;
616
617 if (driver->ops.start) {
618 result = driver->ops.start(device);
619 if (result && driver->ops.remove)
620 driver->ops.remove(device, ACPI_BUS_REMOVAL_NORMAL);
621 }
622
623 return result;
624 }
625
626 /**
627 * acpi_bus_register_driver - register a driver with the ACPI bus
628 * @driver: driver being registered
629 *
630 * Registers a driver with the ACPI bus. Searches the namespace for all
631 * devices that match the driver's criteria and binds. Returns zero for
632 * success or a negative error status for failure.
633 */
634 int acpi_bus_register_driver(struct acpi_driver *driver)
635 {
636 int ret;
637
638 if (acpi_disabled)
639 return -ENODEV;
640 driver->drv.name = driver->name;
641 driver->drv.bus = &acpi_bus_type;
642 driver->drv.owner = driver->owner;
643
644 ret = driver_register(&driver->drv);
645 return ret;
646 }
647
648 EXPORT_SYMBOL(acpi_bus_register_driver);
649
650 /**
651 * acpi_bus_unregister_driver - unregisters a driver with the APIC bus
652 * @driver: driver to unregister
653 *
654 * Unregisters a driver with the ACPI bus. Searches the namespace for all
655 * devices that match the driver's criteria and unbinds.
656 */
657 void acpi_bus_unregister_driver(struct acpi_driver *driver)
658 {
659 driver_unregister(&driver->drv);
660 }
661
662 EXPORT_SYMBOL(acpi_bus_unregister_driver);
663
664 /* --------------------------------------------------------------------------
665 Device Enumeration
666 -------------------------------------------------------------------------- */
667 acpi_status
668 acpi_bus_get_ejd(acpi_handle handle, acpi_handle *ejd)
669 {
670 acpi_status status;
671 acpi_handle tmp;
672 struct acpi_buffer buffer = {ACPI_ALLOCATE_BUFFER, NULL};
673 union acpi_object *obj;
674
675 status = acpi_get_handle(handle, "_EJD", &tmp);
676 if (ACPI_FAILURE(status))
677 return status;
678
679 status = acpi_evaluate_object(handle, "_EJD", NULL, &buffer);
680 if (ACPI_SUCCESS(status)) {
681 obj = buffer.pointer;
682 status = acpi_get_handle(ACPI_ROOT_OBJECT, obj->string.pointer,
683 ejd);
684 kfree(buffer.pointer);
685 }
686 return status;
687 }
688 EXPORT_SYMBOL_GPL(acpi_bus_get_ejd);
689
690 void acpi_bus_data_handler(acpi_handle handle, u32 function, void *context)
691 {
692
693 /* TBD */
694
695 return;
696 }
697
698 static int acpi_bus_get_perf_flags(struct acpi_device *device)
699 {
700 device->performance.state = ACPI_STATE_UNKNOWN;
701 return 0;
702 }
703
704 static acpi_status
705 acpi_bus_extract_wakeup_device_power_package(struct acpi_device *device,
706 union acpi_object *package)
707 {
708 int i = 0;
709 union acpi_object *element = NULL;
710
711 if (!device || !package || (package->package.count < 2))
712 return AE_BAD_PARAMETER;
713
714 element = &(package->package.elements[0]);
715 if (!element)
716 return AE_BAD_PARAMETER;
717 if (element->type == ACPI_TYPE_PACKAGE) {
718 if ((element->package.count < 2) ||
719 (element->package.elements[0].type !=
720 ACPI_TYPE_LOCAL_REFERENCE)
721 || (element->package.elements[1].type != ACPI_TYPE_INTEGER))
722 return AE_BAD_DATA;
723 device->wakeup.gpe_device =
724 element->package.elements[0].reference.handle;
725 device->wakeup.gpe_number =
726 (u32) element->package.elements[1].integer.value;
727 } else if (element->type == ACPI_TYPE_INTEGER) {
728 device->wakeup.gpe_number = element->integer.value;
729 } else
730 return AE_BAD_DATA;
731
732 element = &(package->package.elements[1]);
733 if (element->type != ACPI_TYPE_INTEGER) {
734 return AE_BAD_DATA;
735 }
736 device->wakeup.sleep_state = element->integer.value;
737
738 if ((package->package.count - 2) > ACPI_MAX_HANDLES) {
739 return AE_NO_MEMORY;
740 }
741 device->wakeup.resources.count = package->package.count - 2;
742 for (i = 0; i < device->wakeup.resources.count; i++) {
743 element = &(package->package.elements[i + 2]);
744 if (element->type != ACPI_TYPE_LOCAL_REFERENCE)
745 return AE_BAD_DATA;
746
747 device->wakeup.resources.handles[i] = element->reference.handle;
748 }
749
750 return AE_OK;
751 }
752
753 static int acpi_bus_get_wakeup_device_flags(struct acpi_device *device)
754 {
755 acpi_status status = 0;
756 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
757 union acpi_object *package = NULL;
758 int psw_error;
759
760 struct acpi_device_id button_device_ids[] = {
761 {"PNP0C0D", 0},
762 {"PNP0C0C", 0},
763 {"PNP0C0E", 0},
764 {"", 0},
765 };
766
767 /* _PRW */
768 status = acpi_evaluate_object(device->handle, "_PRW", NULL, &buffer);
769 if (ACPI_FAILURE(status)) {
770 ACPI_EXCEPTION((AE_INFO, status, "Evaluating _PRW"));
771 goto end;
772 }
773
774 package = (union acpi_object *)buffer.pointer;
775 status = acpi_bus_extract_wakeup_device_power_package(device, package);
776 if (ACPI_FAILURE(status)) {
777 ACPI_EXCEPTION((AE_INFO, status, "Extracting _PRW package"));
778 goto end;
779 }
780
781 kfree(buffer.pointer);
782
783 device->wakeup.flags.valid = 1;
784 device->wakeup.prepare_count = 0;
785 /* Call _PSW/_DSW object to disable its ability to wake the sleeping
786 * system for the ACPI device with the _PRW object.
787 * The _PSW object is depreciated in ACPI 3.0 and is replaced by _DSW.
788 * So it is necessary to call _DSW object first. Only when it is not
789 * present will the _PSW object used.
790 */
791 psw_error = acpi_device_sleep_wake(device, 0, 0, 0);
792 if (psw_error)
793 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
794 "error in _DSW or _PSW evaluation\n"));
795
796 /* Power button, Lid switch always enable wakeup */
797 if (!acpi_match_device_ids(device, button_device_ids))
798 device->wakeup.flags.run_wake = 1;
799
800 end:
801 if (ACPI_FAILURE(status))
802 device->flags.wake_capable = 0;
803 return 0;
804 }
805
806 static int acpi_bus_get_power_flags(struct acpi_device *device)
807 {
808 acpi_status status = 0;
809 acpi_handle handle = NULL;
810 u32 i = 0;
811
812
813 /*
814 * Power Management Flags
815 */
816 status = acpi_get_handle(device->handle, "_PSC", &handle);
817 if (ACPI_SUCCESS(status))
818 device->power.flags.explicit_get = 1;
819 status = acpi_get_handle(device->handle, "_IRC", &handle);
820 if (ACPI_SUCCESS(status))
821 device->power.flags.inrush_current = 1;
822
823 /*
824 * Enumerate supported power management states
825 */
826 for (i = ACPI_STATE_D0; i <= ACPI_STATE_D3; i++) {
827 struct acpi_device_power_state *ps = &device->power.states[i];
828 char object_name[5] = { '_', 'P', 'R', '0' + i, '\0' };
829
830 /* Evaluate "_PRx" to se if power resources are referenced */
831 acpi_evaluate_reference(device->handle, object_name, NULL,
832 &ps->resources);
833 if (ps->resources.count) {
834 device->power.flags.power_resources = 1;
835 ps->flags.valid = 1;
836 }
837
838 /* Evaluate "_PSx" to see if we can do explicit sets */
839 object_name[2] = 'S';
840 status = acpi_get_handle(device->handle, object_name, &handle);
841 if (ACPI_SUCCESS(status)) {
842 ps->flags.explicit_set = 1;
843 ps->flags.valid = 1;
844 }
845
846 /* State is valid if we have some power control */
847 if (ps->resources.count || ps->flags.explicit_set)
848 ps->flags.valid = 1;
849
850 ps->power = -1; /* Unknown - driver assigned */
851 ps->latency = -1; /* Unknown - driver assigned */
852 }
853
854 /* Set defaults for D0 and D3 states (always valid) */
855 device->power.states[ACPI_STATE_D0].flags.valid = 1;
856 device->power.states[ACPI_STATE_D0].power = 100;
857 device->power.states[ACPI_STATE_D3].flags.valid = 1;
858 device->power.states[ACPI_STATE_D3].power = 0;
859
860 /* TBD: System wake support and resource requirements. */
861
862 device->power.state = ACPI_STATE_UNKNOWN;
863 acpi_bus_get_power(device->handle, &(device->power.state));
864
865 return 0;
866 }
867
868 static int acpi_bus_get_flags(struct acpi_device *device)
869 {
870 acpi_status status = AE_OK;
871 acpi_handle temp = NULL;
872
873
874 /* Presence of _STA indicates 'dynamic_status' */
875 status = acpi_get_handle(device->handle, "_STA", &temp);
876 if (ACPI_SUCCESS(status))
877 device->flags.dynamic_status = 1;
878
879 /* Presence of _CID indicates 'compatible_ids' */
880 status = acpi_get_handle(device->handle, "_CID", &temp);
881 if (ACPI_SUCCESS(status))
882 device->flags.compatible_ids = 1;
883
884 /* Presence of _RMV indicates 'removable' */
885 status = acpi_get_handle(device->handle, "_RMV", &temp);
886 if (ACPI_SUCCESS(status))
887 device->flags.removable = 1;
888
889 /* Presence of _EJD|_EJ0 indicates 'ejectable' */
890 status = acpi_get_handle(device->handle, "_EJD", &temp);
891 if (ACPI_SUCCESS(status))
892 device->flags.ejectable = 1;
893 else {
894 status = acpi_get_handle(device->handle, "_EJ0", &temp);
895 if (ACPI_SUCCESS(status))
896 device->flags.ejectable = 1;
897 }
898
899 /* Presence of _LCK indicates 'lockable' */
900 status = acpi_get_handle(device->handle, "_LCK", &temp);
901 if (ACPI_SUCCESS(status))
902 device->flags.lockable = 1;
903
904 /* Presence of _PS0|_PR0 indicates 'power manageable' */
905 status = acpi_get_handle(device->handle, "_PS0", &temp);
906 if (ACPI_FAILURE(status))
907 status = acpi_get_handle(device->handle, "_PR0", &temp);
908 if (ACPI_SUCCESS(status))
909 device->flags.power_manageable = 1;
910
911 /* Presence of _PRW indicates wake capable */
912 status = acpi_get_handle(device->handle, "_PRW", &temp);
913 if (ACPI_SUCCESS(status))
914 device->flags.wake_capable = 1;
915
916 /* TBD: Performance management */
917
918 return 0;
919 }
920
921 static void acpi_device_get_busid(struct acpi_device *device,
922 acpi_handle handle, int type)
923 {
924 char bus_id[5] = { '?', 0 };
925 struct acpi_buffer buffer = { sizeof(bus_id), bus_id };
926 int i = 0;
927
928 /*
929 * Bus ID
930 * ------
931 * The device's Bus ID is simply the object name.
932 * TBD: Shouldn't this value be unique (within the ACPI namespace)?
933 */
934 switch (type) {
935 case ACPI_BUS_TYPE_SYSTEM:
936 strcpy(device->pnp.bus_id, "ACPI");
937 break;
938 case ACPI_BUS_TYPE_POWER_BUTTON:
939 strcpy(device->pnp.bus_id, "PWRF");
940 break;
941 case ACPI_BUS_TYPE_SLEEP_BUTTON:
942 strcpy(device->pnp.bus_id, "SLPF");
943 break;
944 default:
945 acpi_get_name(handle, ACPI_SINGLE_NAME, &buffer);
946 /* Clean up trailing underscores (if any) */
947 for (i = 3; i > 1; i--) {
948 if (bus_id[i] == '_')
949 bus_id[i] = '\0';
950 else
951 break;
952 }
953 strcpy(device->pnp.bus_id, bus_id);
954 break;
955 }
956 }
957
958 /*
959 * acpi_bay_match - see if a device is an ejectable driver bay
960 *
961 * If an acpi object is ejectable and has one of the ACPI ATA methods defined,
962 * then we can safely call it an ejectable drive bay
963 */
964 static int acpi_bay_match(struct acpi_device *device){
965 acpi_status status;
966 acpi_handle handle;
967 acpi_handle tmp;
968 acpi_handle phandle;
969
970 handle = device->handle;
971
972 status = acpi_get_handle(handle, "_EJ0", &tmp);
973 if (ACPI_FAILURE(status))
974 return -ENODEV;
975
976 if ((ACPI_SUCCESS(acpi_get_handle(handle, "_GTF", &tmp))) ||
977 (ACPI_SUCCESS(acpi_get_handle(handle, "_GTM", &tmp))) ||
978 (ACPI_SUCCESS(acpi_get_handle(handle, "_STM", &tmp))) ||
979 (ACPI_SUCCESS(acpi_get_handle(handle, "_SDD", &tmp))))
980 return 0;
981
982 if (acpi_get_parent(handle, &phandle))
983 return -ENODEV;
984
985 if ((ACPI_SUCCESS(acpi_get_handle(phandle, "_GTF", &tmp))) ||
986 (ACPI_SUCCESS(acpi_get_handle(phandle, "_GTM", &tmp))) ||
987 (ACPI_SUCCESS(acpi_get_handle(phandle, "_STM", &tmp))) ||
988 (ACPI_SUCCESS(acpi_get_handle(phandle, "_SDD", &tmp))))
989 return 0;
990
991 return -ENODEV;
992 }
993
994 /*
995 * acpi_dock_match - see if a device has a _DCK method
996 */
997 static int acpi_dock_match(struct acpi_device *device)
998 {
999 acpi_handle tmp;
1000 return acpi_get_handle(device->handle, "_DCK", &tmp);
1001 }
1002
1003 static void acpi_device_set_id(struct acpi_device *device,
1004 struct acpi_device *parent, acpi_handle handle,
1005 int type)
1006 {
1007 struct acpi_device_info *info;
1008 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
1009 char *hid = NULL;
1010 char *uid = NULL;
1011 struct acpi_compatible_id_list *cid_list = NULL;
1012 const char *cid_add = NULL;
1013 acpi_status status;
1014
1015 switch (type) {
1016 case ACPI_BUS_TYPE_DEVICE:
1017 status = acpi_get_object_info(handle, &buffer);
1018 if (ACPI_FAILURE(status)) {
1019 printk(KERN_ERR PREFIX "%s: Error reading device info\n", __func__);
1020 return;
1021 }
1022
1023 info = buffer.pointer;
1024 if (info->valid & ACPI_VALID_HID)
1025 hid = info->hardware_id.value;
1026 if (info->valid & ACPI_VALID_UID)
1027 uid = info->unique_id.value;
1028 if (info->valid & ACPI_VALID_CID)
1029 cid_list = &info->compatibility_id;
1030 if (info->valid & ACPI_VALID_ADR) {
1031 device->pnp.bus_address = info->address;
1032 device->flags.bus_address = 1;
1033 }
1034
1035 /* If we have a video/bay/dock device, add our selfdefined
1036 HID to the CID list. Like that the video/bay/dock drivers
1037 will get autoloaded and the device might still match
1038 against another driver.
1039 */
1040 if (acpi_is_video_device(device))
1041 cid_add = ACPI_VIDEO_HID;
1042 else if (ACPI_SUCCESS(acpi_bay_match(device)))
1043 cid_add = ACPI_BAY_HID;
1044 else if (ACPI_SUCCESS(acpi_dock_match(device)))
1045 cid_add = ACPI_DOCK_HID;
1046
1047 break;
1048 case ACPI_BUS_TYPE_POWER:
1049 hid = ACPI_POWER_HID;
1050 break;
1051 case ACPI_BUS_TYPE_PROCESSOR:
1052 hid = ACPI_PROCESSOR_OBJECT_HID;
1053 break;
1054 case ACPI_BUS_TYPE_SYSTEM:
1055 hid = ACPI_SYSTEM_HID;
1056 break;
1057 case ACPI_BUS_TYPE_THERMAL:
1058 hid = ACPI_THERMAL_HID;
1059 break;
1060 case ACPI_BUS_TYPE_POWER_BUTTON:
1061 hid = ACPI_BUTTON_HID_POWERF;
1062 break;
1063 case ACPI_BUS_TYPE_SLEEP_BUTTON:
1064 hid = ACPI_BUTTON_HID_SLEEPF;
1065 break;
1066 }
1067
1068 /*
1069 * \_SB
1070 * ----
1071 * Fix for the system root bus device -- the only root-level device.
1072 */
1073 if (((acpi_handle)parent == ACPI_ROOT_OBJECT) && (type == ACPI_BUS_TYPE_DEVICE)) {
1074 hid = ACPI_BUS_HID;
1075 strcpy(device->pnp.device_name, ACPI_BUS_DEVICE_NAME);
1076 strcpy(device->pnp.device_class, ACPI_BUS_CLASS);
1077 }
1078
1079 if (hid) {
1080 strcpy(device->pnp.hardware_id, hid);
1081 device->flags.hardware_id = 1;
1082 }
1083 if (uid) {
1084 strcpy(device->pnp.unique_id, uid);
1085 device->flags.unique_id = 1;
1086 }
1087 if (cid_list || cid_add) {
1088 struct acpi_compatible_id_list *list;
1089 int size = 0;
1090 int count = 0;
1091
1092 if (cid_list) {
1093 size = cid_list->size;
1094 } else if (cid_add) {
1095 size = sizeof(struct acpi_compatible_id_list);
1096 cid_list = ACPI_ALLOCATE_ZEROED((acpi_size) size);
1097 if (!cid_list) {
1098 printk(KERN_ERR "Memory allocation error\n");
1099 kfree(buffer.pointer);
1100 return;
1101 } else {
1102 cid_list->count = 0;
1103 cid_list->size = size;
1104 }
1105 }
1106 if (cid_add)
1107 size += sizeof(struct acpi_compatible_id);
1108 list = kmalloc(size, GFP_KERNEL);
1109
1110 if (list) {
1111 if (cid_list) {
1112 memcpy(list, cid_list, cid_list->size);
1113 count = cid_list->count;
1114 }
1115 if (cid_add) {
1116 strncpy(list->id[count].value, cid_add,
1117 ACPI_MAX_CID_LENGTH);
1118 count++;
1119 device->flags.compatible_ids = 1;
1120 }
1121 list->size = size;
1122 list->count = count;
1123 device->pnp.cid_list = list;
1124 } else
1125 printk(KERN_ERR PREFIX "Memory allocation error\n");
1126 }
1127
1128 kfree(buffer.pointer);
1129 }
1130
1131 static int acpi_device_set_context(struct acpi_device *device, int type)
1132 {
1133 acpi_status status = AE_OK;
1134 int result = 0;
1135 /*
1136 * Context
1137 * -------
1138 * Attach this 'struct acpi_device' to the ACPI object. This makes
1139 * resolutions from handle->device very efficient. Note that we need
1140 * to be careful with fixed-feature devices as they all attach to the
1141 * root object.
1142 */
1143 if (type != ACPI_BUS_TYPE_POWER_BUTTON &&
1144 type != ACPI_BUS_TYPE_SLEEP_BUTTON) {
1145 status = acpi_attach_data(device->handle,
1146 acpi_bus_data_handler, device);
1147
1148 if (ACPI_FAILURE(status)) {
1149 printk(KERN_ERR PREFIX "Error attaching device data\n");
1150 result = -ENODEV;
1151 }
1152 }
1153 return result;
1154 }
1155
1156 static int acpi_bus_remove(struct acpi_device *dev, int rmdevice)
1157 {
1158 if (!dev)
1159 return -EINVAL;
1160
1161 dev->removal_type = ACPI_BUS_REMOVAL_EJECT;
1162 device_release_driver(&dev->dev);
1163
1164 if (!rmdevice)
1165 return 0;
1166
1167 /*
1168 * unbind _ADR-Based Devices when hot removal
1169 */
1170 if (dev->flags.bus_address) {
1171 if ((dev->parent) && (dev->parent->ops.unbind))
1172 dev->parent->ops.unbind(dev);
1173 }
1174 acpi_device_unregister(dev, ACPI_BUS_REMOVAL_EJECT);
1175
1176 return 0;
1177 }
1178
1179 static int
1180 acpi_add_single_object(struct acpi_device **child,
1181 struct acpi_device *parent, acpi_handle handle, int type,
1182 struct acpi_bus_ops *ops)
1183 {
1184 int result = 0;
1185 struct acpi_device *device = NULL;
1186
1187
1188 if (!child)
1189 return -EINVAL;
1190
1191 device = kzalloc(sizeof(struct acpi_device), GFP_KERNEL);
1192 if (!device) {
1193 printk(KERN_ERR PREFIX "Memory allocation error\n");
1194 return -ENOMEM;
1195 }
1196
1197 device->handle = handle;
1198 device->parent = parent;
1199 device->bus_ops = *ops; /* workround for not call .start */
1200
1201
1202 acpi_device_get_busid(device, handle, type);
1203
1204 /*
1205 * Flags
1206 * -----
1207 * Get prior to calling acpi_bus_get_status() so we know whether
1208 * or not _STA is present. Note that we only look for object
1209 * handles -- cannot evaluate objects until we know the device is
1210 * present and properly initialized.
1211 */
1212 result = acpi_bus_get_flags(device);
1213 if (result)
1214 goto end;
1215
1216 /*
1217 * Status
1218 * ------
1219 * See if the device is present. We always assume that non-Device
1220 * and non-Processor objects (e.g. thermal zones, power resources,
1221 * etc.) are present, functioning, etc. (at least when parent object
1222 * is present). Note that _STA has a different meaning for some
1223 * objects (e.g. power resources) so we need to be careful how we use
1224 * it.
1225 */
1226 switch (type) {
1227 case ACPI_BUS_TYPE_PROCESSOR:
1228 case ACPI_BUS_TYPE_DEVICE:
1229 result = acpi_bus_get_status(device);
1230 if (ACPI_FAILURE(result)) {
1231 result = -ENODEV;
1232 goto end;
1233 }
1234 /*
1235 * When the device is neither present nor functional, the
1236 * device should not be added to Linux ACPI device tree.
1237 * When the status of the device is not present but functinal,
1238 * it should be added to Linux ACPI tree. For example : bay
1239 * device , dock device.
1240 * In such conditions it is unncessary to check whether it is
1241 * bay device or dock device.
1242 */
1243 if (!device->status.present && !device->status.functional) {
1244 result = -ENODEV;
1245 goto end;
1246 }
1247 break;
1248 default:
1249 STRUCT_TO_INT(device->status) =
1250 ACPI_STA_DEVICE_PRESENT | ACPI_STA_DEVICE_ENABLED |
1251 ACPI_STA_DEVICE_UI | ACPI_STA_DEVICE_FUNCTIONING;
1252 break;
1253 }
1254
1255 /*
1256 * Initialize Device
1257 * -----------------
1258 * TBD: Synch with Core's enumeration/initialization process.
1259 */
1260
1261 /*
1262 * Hardware ID, Unique ID, & Bus Address
1263 * -------------------------------------
1264 */
1265 acpi_device_set_id(device, parent, handle, type);
1266
1267 /*
1268 * The ACPI device is attached to acpi handle before getting
1269 * the power/wakeup/peformance flags. Otherwise OS can't get
1270 * the corresponding ACPI device by the acpi handle in the course
1271 * of getting the power/wakeup/performance flags.
1272 */
1273 result = acpi_device_set_context(device, type);
1274 if (result)
1275 goto end;
1276
1277 /*
1278 * Power Management
1279 * ----------------
1280 */
1281 if (device->flags.power_manageable) {
1282 result = acpi_bus_get_power_flags(device);
1283 if (result)
1284 goto end;
1285 }
1286
1287 /*
1288 * Wakeup device management
1289 *-----------------------
1290 */
1291 if (device->flags.wake_capable) {
1292 result = acpi_bus_get_wakeup_device_flags(device);
1293 if (result)
1294 goto end;
1295 }
1296
1297 /*
1298 * Performance Management
1299 * ----------------------
1300 */
1301 if (device->flags.performance_manageable) {
1302 result = acpi_bus_get_perf_flags(device);
1303 if (result)
1304 goto end;
1305 }
1306
1307
1308 result = acpi_device_register(device, parent);
1309
1310 /*
1311 * Bind _ADR-Based Devices when hot add
1312 */
1313 if (device->flags.bus_address) {
1314 if (device->parent && device->parent->ops.bind)
1315 device->parent->ops.bind(device);
1316 }
1317
1318 end:
1319 if (!result)
1320 *child = device;
1321 else {
1322 kfree(device->pnp.cid_list);
1323 kfree(device);
1324 }
1325
1326 return result;
1327 }
1328
1329 static int acpi_bus_scan(struct acpi_device *start, struct acpi_bus_ops *ops)
1330 {
1331 acpi_status status = AE_OK;
1332 struct acpi_device *parent = NULL;
1333 struct acpi_device *child = NULL;
1334 acpi_handle phandle = NULL;
1335 acpi_handle chandle = NULL;
1336 acpi_object_type type = 0;
1337 u32 level = 1;
1338
1339
1340 if (!start)
1341 return -EINVAL;
1342
1343 parent = start;
1344 phandle = start->handle;
1345
1346 /*
1347 * Parse through the ACPI namespace, identify all 'devices', and
1348 * create a new 'struct acpi_device' for each.
1349 */
1350 while ((level > 0) && parent) {
1351
1352 status = acpi_get_next_object(ACPI_TYPE_ANY, phandle,
1353 chandle, &chandle);
1354
1355 /*
1356 * If this scope is exhausted then move our way back up.
1357 */
1358 if (ACPI_FAILURE(status)) {
1359 level--;
1360 chandle = phandle;
1361 acpi_get_parent(phandle, &phandle);
1362 if (parent->parent)
1363 parent = parent->parent;
1364 continue;
1365 }
1366
1367 status = acpi_get_type(chandle, &type);
1368 if (ACPI_FAILURE(status))
1369 continue;
1370
1371 /*
1372 * If this is a scope object then parse it (depth-first).
1373 */
1374 if (type == ACPI_TYPE_LOCAL_SCOPE) {
1375 level++;
1376 phandle = chandle;
1377 chandle = NULL;
1378 continue;
1379 }
1380
1381 /*
1382 * We're only interested in objects that we consider 'devices'.
1383 */
1384 switch (type) {
1385 case ACPI_TYPE_DEVICE:
1386 type = ACPI_BUS_TYPE_DEVICE;
1387 break;
1388 case ACPI_TYPE_PROCESSOR:
1389 type = ACPI_BUS_TYPE_PROCESSOR;
1390 break;
1391 case ACPI_TYPE_THERMAL:
1392 type = ACPI_BUS_TYPE_THERMAL;
1393 break;
1394 case ACPI_TYPE_POWER:
1395 type = ACPI_BUS_TYPE_POWER;
1396 break;
1397 default:
1398 continue;
1399 }
1400
1401 if (ops->acpi_op_add)
1402 status = acpi_add_single_object(&child, parent,
1403 chandle, type, ops);
1404 else
1405 status = acpi_bus_get_device(chandle, &child);
1406
1407 if (ACPI_FAILURE(status))
1408 continue;
1409
1410 if (ops->acpi_op_start && !(ops->acpi_op_add)) {
1411 status = acpi_start_single_object(child);
1412 if (ACPI_FAILURE(status))
1413 continue;
1414 }
1415
1416 /*
1417 * If the device is present, enabled, and functioning then
1418 * parse its scope (depth-first). Note that we need to
1419 * represent absent devices to facilitate PnP notifications
1420 * -- but only the subtree head (not all of its children,
1421 * which will be enumerated when the parent is inserted).
1422 *
1423 * TBD: Need notifications and other detection mechanisms
1424 * in place before we can fully implement this.
1425 */
1426 /*
1427 * When the device is not present but functional, it is also
1428 * necessary to scan the children of this device.
1429 */
1430 if (child->status.present || (!child->status.present &&
1431 child->status.functional)) {
1432 status = acpi_get_next_object(ACPI_TYPE_ANY, chandle,
1433 NULL, NULL);
1434 if (ACPI_SUCCESS(status)) {
1435 level++;
1436 phandle = chandle;
1437 chandle = NULL;
1438 parent = child;
1439 }
1440 }
1441 }
1442
1443 return 0;
1444 }
1445
1446 int
1447 acpi_bus_add(struct acpi_device **child,
1448 struct acpi_device *parent, acpi_handle handle, int type)
1449 {
1450 int result;
1451 struct acpi_bus_ops ops;
1452
1453 memset(&ops, 0, sizeof(ops));
1454 ops.acpi_op_add = 1;
1455
1456 result = acpi_add_single_object(child, parent, handle, type, &ops);
1457 if (!result)
1458 result = acpi_bus_scan(*child, &ops);
1459
1460 return result;
1461 }
1462 EXPORT_SYMBOL(acpi_bus_add);
1463
1464 int acpi_bus_start(struct acpi_device *device)
1465 {
1466 int result;
1467 struct acpi_bus_ops ops;
1468
1469
1470 if (!device)
1471 return -EINVAL;
1472
1473 result = acpi_start_single_object(device);
1474 if (!result) {
1475 memset(&ops, 0, sizeof(ops));
1476 ops.acpi_op_start = 1;
1477 result = acpi_bus_scan(device, &ops);
1478 }
1479 return result;
1480 }
1481 EXPORT_SYMBOL(acpi_bus_start);
1482
1483 int acpi_bus_trim(struct acpi_device *start, int rmdevice)
1484 {
1485 acpi_status status;
1486 struct acpi_device *parent, *child;
1487 acpi_handle phandle, chandle;
1488 acpi_object_type type;
1489 u32 level = 1;
1490 int err = 0;
1491
1492 parent = start;
1493 phandle = start->handle;
1494 child = chandle = NULL;
1495
1496 while ((level > 0) && parent && (!err)) {
1497 status = acpi_get_next_object(ACPI_TYPE_ANY, phandle,
1498 chandle, &chandle);
1499
1500 /*
1501 * If this scope is exhausted then move our way back up.
1502 */
1503 if (ACPI_FAILURE(status)) {
1504 level--;
1505 chandle = phandle;
1506 acpi_get_parent(phandle, &phandle);
1507 child = parent;
1508 parent = parent->parent;
1509
1510 if (level == 0)
1511 err = acpi_bus_remove(child, rmdevice);
1512 else
1513 err = acpi_bus_remove(child, 1);
1514
1515 continue;
1516 }
1517
1518 status = acpi_get_type(chandle, &type);
1519 if (ACPI_FAILURE(status)) {
1520 continue;
1521 }
1522 /*
1523 * If there is a device corresponding to chandle then
1524 * parse it (depth-first).
1525 */
1526 if (acpi_bus_get_device(chandle, &child) == 0) {
1527 level++;
1528 phandle = chandle;
1529 chandle = NULL;
1530 parent = child;
1531 }
1532 continue;
1533 }
1534 return err;
1535 }
1536 EXPORT_SYMBOL_GPL(acpi_bus_trim);
1537
1538 static int acpi_bus_scan_fixed(struct acpi_device *root)
1539 {
1540 int result = 0;
1541 struct acpi_device *device = NULL;
1542 struct acpi_bus_ops ops;
1543
1544 if (!root)
1545 return -ENODEV;
1546
1547 memset(&ops, 0, sizeof(ops));
1548 ops.acpi_op_add = 1;
1549 ops.acpi_op_start = 1;
1550
1551 /*
1552 * Enumerate all fixed-feature devices.
1553 */
1554 if ((acpi_gbl_FADT.flags & ACPI_FADT_POWER_BUTTON) == 0) {
1555 result = acpi_add_single_object(&device, acpi_root,
1556 NULL,
1557 ACPI_BUS_TYPE_POWER_BUTTON,
1558 &ops);
1559 }
1560
1561 if ((acpi_gbl_FADT.flags & ACPI_FADT_SLEEP_BUTTON) == 0) {
1562 result = acpi_add_single_object(&device, acpi_root,
1563 NULL,
1564 ACPI_BUS_TYPE_SLEEP_BUTTON,
1565 &ops);
1566 }
1567
1568 return result;
1569 }
1570
1571 int __init acpi_scan_init(void)
1572 {
1573 int result;
1574 struct acpi_bus_ops ops;
1575
1576 memset(&ops, 0, sizeof(ops));
1577 ops.acpi_op_add = 1;
1578 ops.acpi_op_start = 1;
1579
1580 result = bus_register(&acpi_bus_type);
1581 if (result) {
1582 /* We don't want to quit even if we failed to add suspend/resume */
1583 printk(KERN_ERR PREFIX "Could not register bus type\n");
1584 }
1585
1586 /*
1587 * Create the root device in the bus's device tree
1588 */
1589 result = acpi_add_single_object(&acpi_root, NULL, ACPI_ROOT_OBJECT,
1590 ACPI_BUS_TYPE_SYSTEM, &ops);
1591 if (result)
1592 goto Done;
1593
1594 /*
1595 * Enumerate devices in the ACPI namespace.
1596 */
1597 result = acpi_bus_scan_fixed(acpi_root);
1598
1599 if (!result)
1600 result = acpi_bus_scan(acpi_root, &ops);
1601
1602 if (result)
1603 acpi_device_unregister(acpi_root, ACPI_BUS_REMOVAL_NORMAL);
1604
1605 Done:
1606 return result;
1607 }
Linux 2.6 ibm-acpi/thinkpad-acpi driver git tree