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Merge branch 'processor-procfs-2.6.32' into release
[deliverable/linux.git] / drivers / acpi / scan.c
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 acpica_device_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->ids[i].string);
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 acpica_device_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->ids[i].string))
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 if (acpi_dev->flags.hardware_id)
313 kfree(acpi_dev->pnp.hardware_id);
314 if (acpi_dev->flags.unique_id)
315 kfree(acpi_dev->pnp.unique_id);
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.remove)
434 acpi_drv->ops.remove(acpi_dev,
435 acpi_dev->removal_type);
436 return ret;
437 }
438 }
439
440 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
441 "Found driver [%s] for device [%s]\n",
442 acpi_drv->name, acpi_dev->pnp.bus_id));
443 get_device(dev);
444 }
445 return ret;
446 }
447
448 static int acpi_device_remove(struct device * dev)
449 {
450 struct acpi_device *acpi_dev = to_acpi_device(dev);
451 struct acpi_driver *acpi_drv = acpi_dev->driver;
452
453 if (acpi_drv) {
454 if (acpi_drv->ops.notify)
455 acpi_device_remove_notify_handler(acpi_dev);
456 if (acpi_drv->ops.remove)
457 acpi_drv->ops.remove(acpi_dev, acpi_dev->removal_type);
458 }
459 acpi_dev->driver = NULL;
460 acpi_dev->driver_data = NULL;
461
462 put_device(dev);
463 return 0;
464 }
465
466 struct bus_type acpi_bus_type = {
467 .name = "acpi",
468 .suspend = acpi_device_suspend,
469 .resume = acpi_device_resume,
470 .match = acpi_bus_match,
471 .probe = acpi_device_probe,
472 .remove = acpi_device_remove,
473 .uevent = acpi_device_uevent,
474 };
475
476 static int acpi_device_register(struct acpi_device *device,
477 struct acpi_device *parent)
478 {
479 int result;
480 struct acpi_device_bus_id *acpi_device_bus_id, *new_bus_id;
481 int found = 0;
482 /*
483 * Linkage
484 * -------
485 * Link this device to its parent and siblings.
486 */
487 INIT_LIST_HEAD(&device->children);
488 INIT_LIST_HEAD(&device->node);
489 INIT_LIST_HEAD(&device->wakeup_list);
490
491 new_bus_id = kzalloc(sizeof(struct acpi_device_bus_id), GFP_KERNEL);
492 if (!new_bus_id) {
493 printk(KERN_ERR PREFIX "Memory allocation error\n");
494 return -ENOMEM;
495 }
496
497 mutex_lock(&acpi_device_lock);
498 /*
499 * Find suitable bus_id and instance number in acpi_bus_id_list
500 * If failed, create one and link it into acpi_bus_id_list
501 */
502 list_for_each_entry(acpi_device_bus_id, &acpi_bus_id_list, node) {
503 if(!strcmp(acpi_device_bus_id->bus_id, device->flags.hardware_id? device->pnp.hardware_id : "device")) {
504 acpi_device_bus_id->instance_no ++;
505 found = 1;
506 kfree(new_bus_id);
507 break;
508 }
509 }
510 if (!found) {
511 acpi_device_bus_id = new_bus_id;
512 strcpy(acpi_device_bus_id->bus_id, device->flags.hardware_id ? device->pnp.hardware_id : "device");
513 acpi_device_bus_id->instance_no = 0;
514 list_add_tail(&acpi_device_bus_id->node, &acpi_bus_id_list);
515 }
516 dev_set_name(&device->dev, "%s:%02x", acpi_device_bus_id->bus_id, acpi_device_bus_id->instance_no);
517
518 if (device->parent)
519 list_add_tail(&device->node, &device->parent->children);
520
521 if (device->wakeup.flags.valid)
522 list_add_tail(&device->wakeup_list, &acpi_wakeup_device_list);
523 mutex_unlock(&acpi_device_lock);
524
525 if (device->parent)
526 device->dev.parent = &parent->dev;
527 device->dev.bus = &acpi_bus_type;
528 device->dev.release = &acpi_device_release;
529 result = device_register(&device->dev);
530 if (result) {
531 dev_err(&device->dev, "Error registering device\n");
532 goto end;
533 }
534
535 result = acpi_device_setup_files(device);
536 if (result)
537 printk(KERN_ERR PREFIX "Error creating sysfs interface for device %s\n",
538 dev_name(&device->dev));
539
540 device->removal_type = ACPI_BUS_REMOVAL_NORMAL;
541 return 0;
542 end:
543 mutex_lock(&acpi_device_lock);
544 if (device->parent)
545 list_del(&device->node);
546 list_del(&device->wakeup_list);
547 mutex_unlock(&acpi_device_lock);
548 return result;
549 }
550
551 static void acpi_device_unregister(struct acpi_device *device, int type)
552 {
553 mutex_lock(&acpi_device_lock);
554 if (device->parent)
555 list_del(&device->node);
556
557 list_del(&device->wakeup_list);
558 mutex_unlock(&acpi_device_lock);
559
560 acpi_detach_data(device->handle, acpi_bus_data_handler);
561
562 acpi_device_remove_files(device);
563 device_unregister(&device->dev);
564 }
565
566 /* --------------------------------------------------------------------------
567 Driver Management
568 -------------------------------------------------------------------------- */
569 /**
570 * acpi_bus_driver_init - add a device to a driver
571 * @device: the device to add and initialize
572 * @driver: driver for the device
573 *
574 * Used to initialize a device via its device driver. Called whenever a
575 * driver is bound to a device. Invokes the driver's add() ops.
576 */
577 static int
578 acpi_bus_driver_init(struct acpi_device *device, struct acpi_driver *driver)
579 {
580 int result = 0;
581
582 if (!device || !driver)
583 return -EINVAL;
584
585 if (!driver->ops.add)
586 return -ENOSYS;
587
588 result = driver->ops.add(device);
589 if (result) {
590 device->driver = NULL;
591 device->driver_data = NULL;
592 return result;
593 }
594
595 device->driver = driver;
596
597 /*
598 * TBD - Configuration Management: Assign resources to device based
599 * upon possible configuration and currently allocated resources.
600 */
601
602 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
603 "Driver successfully bound to device\n"));
604 return 0;
605 }
606
607 static int acpi_start_single_object(struct acpi_device *device)
608 {
609 int result = 0;
610 struct acpi_driver *driver;
611
612
613 if (!(driver = device->driver))
614 return 0;
615
616 if (driver->ops.start) {
617 result = driver->ops.start(device);
618 if (result && driver->ops.remove)
619 driver->ops.remove(device, ACPI_BUS_REMOVAL_NORMAL);
620 }
621
622 return result;
623 }
624
625 /**
626 * acpi_bus_register_driver - register a driver with the ACPI bus
627 * @driver: driver being registered
628 *
629 * Registers a driver with the ACPI bus. Searches the namespace for all
630 * devices that match the driver's criteria and binds. Returns zero for
631 * success or a negative error status for failure.
632 */
633 int acpi_bus_register_driver(struct acpi_driver *driver)
634 {
635 int ret;
636
637 if (acpi_disabled)
638 return -ENODEV;
639 driver->drv.name = driver->name;
640 driver->drv.bus = &acpi_bus_type;
641 driver->drv.owner = driver->owner;
642
643 ret = driver_register(&driver->drv);
644 return ret;
645 }
646
647 EXPORT_SYMBOL(acpi_bus_register_driver);
648
649 /**
650 * acpi_bus_unregister_driver - unregisters a driver with the APIC bus
651 * @driver: driver to unregister
652 *
653 * Unregisters a driver with the ACPI bus. Searches the namespace for all
654 * devices that match the driver's criteria and unbinds.
655 */
656 void acpi_bus_unregister_driver(struct acpi_driver *driver)
657 {
658 driver_unregister(&driver->drv);
659 }
660
661 EXPORT_SYMBOL(acpi_bus_unregister_driver);
662
663 /* --------------------------------------------------------------------------
664 Device Enumeration
665 -------------------------------------------------------------------------- */
666 acpi_status
667 acpi_bus_get_ejd(acpi_handle handle, acpi_handle *ejd)
668 {
669 acpi_status status;
670 acpi_handle tmp;
671 struct acpi_buffer buffer = {ACPI_ALLOCATE_BUFFER, NULL};
672 union acpi_object *obj;
673
674 status = acpi_get_handle(handle, "_EJD", &tmp);
675 if (ACPI_FAILURE(status))
676 return status;
677
678 status = acpi_evaluate_object(handle, "_EJD", NULL, &buffer);
679 if (ACPI_SUCCESS(status)) {
680 obj = buffer.pointer;
681 status = acpi_get_handle(ACPI_ROOT_OBJECT, obj->string.pointer,
682 ejd);
683 kfree(buffer.pointer);
684 }
685 return status;
686 }
687 EXPORT_SYMBOL_GPL(acpi_bus_get_ejd);
688
689 void acpi_bus_data_handler(acpi_handle handle, void *context)
690 {
691
692 /* TBD */
693
694 return;
695 }
696
697 static int acpi_bus_get_perf_flags(struct acpi_device *device)
698 {
699 device->performance.state = ACPI_STATE_UNKNOWN;
700 return 0;
701 }
702
703 static acpi_status
704 acpi_bus_extract_wakeup_device_power_package(struct acpi_device *device,
705 union acpi_object *package)
706 {
707 int i = 0;
708 union acpi_object *element = NULL;
709
710 if (!device || !package || (package->package.count < 2))
711 return AE_BAD_PARAMETER;
712
713 element = &(package->package.elements[0]);
714 if (!element)
715 return AE_BAD_PARAMETER;
716 if (element->type == ACPI_TYPE_PACKAGE) {
717 if ((element->package.count < 2) ||
718 (element->package.elements[0].type !=
719 ACPI_TYPE_LOCAL_REFERENCE)
720 || (element->package.elements[1].type != ACPI_TYPE_INTEGER))
721 return AE_BAD_DATA;
722 device->wakeup.gpe_device =
723 element->package.elements[0].reference.handle;
724 device->wakeup.gpe_number =
725 (u32) element->package.elements[1].integer.value;
726 } else if (element->type == ACPI_TYPE_INTEGER) {
727 device->wakeup.gpe_number = element->integer.value;
728 } else
729 return AE_BAD_DATA;
730
731 element = &(package->package.elements[1]);
732 if (element->type != ACPI_TYPE_INTEGER) {
733 return AE_BAD_DATA;
734 }
735 device->wakeup.sleep_state = element->integer.value;
736
737 if ((package->package.count - 2) > ACPI_MAX_HANDLES) {
738 return AE_NO_MEMORY;
739 }
740 device->wakeup.resources.count = package->package.count - 2;
741 for (i = 0; i < device->wakeup.resources.count; i++) {
742 element = &(package->package.elements[i + 2]);
743 if (element->type != ACPI_TYPE_LOCAL_REFERENCE)
744 return AE_BAD_DATA;
745
746 device->wakeup.resources.handles[i] = element->reference.handle;
747 }
748
749 return AE_OK;
750 }
751
752 static int acpi_bus_get_wakeup_device_flags(struct acpi_device *device)
753 {
754 acpi_status status = 0;
755 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
756 union acpi_object *package = NULL;
757 int psw_error;
758
759 struct acpi_device_id button_device_ids[] = {
760 {"PNP0C0D", 0},
761 {"PNP0C0C", 0},
762 {"PNP0C0E", 0},
763 {"", 0},
764 };
765
766 /* _PRW */
767 status = acpi_evaluate_object(device->handle, "_PRW", NULL, &buffer);
768 if (ACPI_FAILURE(status)) {
769 ACPI_EXCEPTION((AE_INFO, status, "Evaluating _PRW"));
770 goto end;
771 }
772
773 package = (union acpi_object *)buffer.pointer;
774 status = acpi_bus_extract_wakeup_device_power_package(device, package);
775 if (ACPI_FAILURE(status)) {
776 ACPI_EXCEPTION((AE_INFO, status, "Extracting _PRW package"));
777 goto end;
778 }
779
780 kfree(buffer.pointer);
781
782 device->wakeup.flags.valid = 1;
783 device->wakeup.prepare_count = 0;
784 /* Call _PSW/_DSW object to disable its ability to wake the sleeping
785 * system for the ACPI device with the _PRW object.
786 * The _PSW object is depreciated in ACPI 3.0 and is replaced by _DSW.
787 * So it is necessary to call _DSW object first. Only when it is not
788 * present will the _PSW object used.
789 */
790 psw_error = acpi_device_sleep_wake(device, 0, 0, 0);
791 if (psw_error)
792 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
793 "error in _DSW or _PSW evaluation\n"));
794
795 /* Power button, Lid switch always enable wakeup */
796 if (!acpi_match_device_ids(device, button_device_ids))
797 device->wakeup.flags.run_wake = 1;
798
799 end:
800 if (ACPI_FAILURE(status))
801 device->flags.wake_capable = 0;
802 return 0;
803 }
804
805 static int acpi_bus_get_power_flags(struct acpi_device *device)
806 {
807 acpi_status status = 0;
808 acpi_handle handle = NULL;
809 u32 i = 0;
810
811
812 /*
813 * Power Management Flags
814 */
815 status = acpi_get_handle(device->handle, "_PSC", &handle);
816 if (ACPI_SUCCESS(status))
817 device->power.flags.explicit_get = 1;
818 status = acpi_get_handle(device->handle, "_IRC", &handle);
819 if (ACPI_SUCCESS(status))
820 device->power.flags.inrush_current = 1;
821
822 /*
823 * Enumerate supported power management states
824 */
825 for (i = ACPI_STATE_D0; i <= ACPI_STATE_D3; i++) {
826 struct acpi_device_power_state *ps = &device->power.states[i];
827 char object_name[5] = { '_', 'P', 'R', '0' + i, '\0' };
828
829 /* Evaluate "_PRx" to se if power resources are referenced */
830 acpi_evaluate_reference(device->handle, object_name, NULL,
831 &ps->resources);
832 if (ps->resources.count) {
833 device->power.flags.power_resources = 1;
834 ps->flags.valid = 1;
835 }
836
837 /* Evaluate "_PSx" to see if we can do explicit sets */
838 object_name[2] = 'S';
839 status = acpi_get_handle(device->handle, object_name, &handle);
840 if (ACPI_SUCCESS(status)) {
841 ps->flags.explicit_set = 1;
842 ps->flags.valid = 1;
843 }
844
845 /* State is valid if we have some power control */
846 if (ps->resources.count || ps->flags.explicit_set)
847 ps->flags.valid = 1;
848
849 ps->power = -1; /* Unknown - driver assigned */
850 ps->latency = -1; /* Unknown - driver assigned */
851 }
852
853 /* Set defaults for D0 and D3 states (always valid) */
854 device->power.states[ACPI_STATE_D0].flags.valid = 1;
855 device->power.states[ACPI_STATE_D0].power = 100;
856 device->power.states[ACPI_STATE_D3].flags.valid = 1;
857 device->power.states[ACPI_STATE_D3].power = 0;
858
859 /* TBD: System wake support and resource requirements. */
860
861 device->power.state = ACPI_STATE_UNKNOWN;
862 acpi_bus_get_power(device->handle, &(device->power.state));
863
864 return 0;
865 }
866
867 static int acpi_bus_get_flags(struct acpi_device *device)
868 {
869 acpi_status status = AE_OK;
870 acpi_handle temp = NULL;
871
872
873 /* Presence of _STA indicates 'dynamic_status' */
874 status = acpi_get_handle(device->handle, "_STA", &temp);
875 if (ACPI_SUCCESS(status))
876 device->flags.dynamic_status = 1;
877
878 /* Presence of _CID indicates 'compatible_ids' */
879 status = acpi_get_handle(device->handle, "_CID", &temp);
880 if (ACPI_SUCCESS(status))
881 device->flags.compatible_ids = 1;
882
883 /* Presence of _RMV indicates 'removable' */
884 status = acpi_get_handle(device->handle, "_RMV", &temp);
885 if (ACPI_SUCCESS(status))
886 device->flags.removable = 1;
887
888 /* Presence of _EJD|_EJ0 indicates 'ejectable' */
889 status = acpi_get_handle(device->handle, "_EJD", &temp);
890 if (ACPI_SUCCESS(status))
891 device->flags.ejectable = 1;
892 else {
893 status = acpi_get_handle(device->handle, "_EJ0", &temp);
894 if (ACPI_SUCCESS(status))
895 device->flags.ejectable = 1;
896 }
897
898 /* Presence of _LCK indicates 'lockable' */
899 status = acpi_get_handle(device->handle, "_LCK", &temp);
900 if (ACPI_SUCCESS(status))
901 device->flags.lockable = 1;
902
903 /* Presence of _PS0|_PR0 indicates 'power manageable' */
904 status = acpi_get_handle(device->handle, "_PS0", &temp);
905 if (ACPI_FAILURE(status))
906 status = acpi_get_handle(device->handle, "_PR0", &temp);
907 if (ACPI_SUCCESS(status))
908 device->flags.power_manageable = 1;
909
910 /* Presence of _PRW indicates wake capable */
911 status = acpi_get_handle(device->handle, "_PRW", &temp);
912 if (ACPI_SUCCESS(status))
913 device->flags.wake_capable = 1;
914
915 /* TBD: Performance management */
916
917 return 0;
918 }
919
920 static void acpi_device_get_busid(struct acpi_device *device,
921 acpi_handle handle, int type)
922 {
923 char bus_id[5] = { '?', 0 };
924 struct acpi_buffer buffer = { sizeof(bus_id), bus_id };
925 int i = 0;
926
927 /*
928 * Bus ID
929 * ------
930 * The device's Bus ID is simply the object name.
931 * TBD: Shouldn't this value be unique (within the ACPI namespace)?
932 */
933 switch (type) {
934 case ACPI_BUS_TYPE_SYSTEM:
935 strcpy(device->pnp.bus_id, "ACPI");
936 break;
937 case ACPI_BUS_TYPE_POWER_BUTTON:
938 strcpy(device->pnp.bus_id, "PWRF");
939 break;
940 case ACPI_BUS_TYPE_SLEEP_BUTTON:
941 strcpy(device->pnp.bus_id, "SLPF");
942 break;
943 default:
944 acpi_get_name(handle, ACPI_SINGLE_NAME, &buffer);
945 /* Clean up trailing underscores (if any) */
946 for (i = 3; i > 1; i--) {
947 if (bus_id[i] == '_')
948 bus_id[i] = '\0';
949 else
950 break;
951 }
952 strcpy(device->pnp.bus_id, bus_id);
953 break;
954 }
955 }
956
957 /*
958 * acpi_bay_match - see if a device is an ejectable driver bay
959 *
960 * If an acpi object is ejectable and has one of the ACPI ATA methods defined,
961 * then we can safely call it an ejectable drive bay
962 */
963 static int acpi_bay_match(struct acpi_device *device){
964 acpi_status status;
965 acpi_handle handle;
966 acpi_handle tmp;
967 acpi_handle phandle;
968
969 handle = device->handle;
970
971 status = acpi_get_handle(handle, "_EJ0", &tmp);
972 if (ACPI_FAILURE(status))
973 return -ENODEV;
974
975 if ((ACPI_SUCCESS(acpi_get_handle(handle, "_GTF", &tmp))) ||
976 (ACPI_SUCCESS(acpi_get_handle(handle, "_GTM", &tmp))) ||
977 (ACPI_SUCCESS(acpi_get_handle(handle, "_STM", &tmp))) ||
978 (ACPI_SUCCESS(acpi_get_handle(handle, "_SDD", &tmp))))
979 return 0;
980
981 if (acpi_get_parent(handle, &phandle))
982 return -ENODEV;
983
984 if ((ACPI_SUCCESS(acpi_get_handle(phandle, "_GTF", &tmp))) ||
985 (ACPI_SUCCESS(acpi_get_handle(phandle, "_GTM", &tmp))) ||
986 (ACPI_SUCCESS(acpi_get_handle(phandle, "_STM", &tmp))) ||
987 (ACPI_SUCCESS(acpi_get_handle(phandle, "_SDD", &tmp))))
988 return 0;
989
990 return -ENODEV;
991 }
992
993 /*
994 * acpi_dock_match - see if a device has a _DCK method
995 */
996 static int acpi_dock_match(struct acpi_device *device)
997 {
998 acpi_handle tmp;
999 return acpi_get_handle(device->handle, "_DCK", &tmp);
1000 }
1001
1002 static struct acpica_device_id_list*
1003 acpi_add_cid(
1004 struct acpi_device_info *info,
1005 struct acpica_device_id *new_cid)
1006 {
1007 struct acpica_device_id_list *cid;
1008 char *next_id_string;
1009 acpi_size cid_length;
1010 acpi_size new_cid_length;
1011 u32 i;
1012
1013
1014 /* Allocate new CID list with room for the new CID */
1015
1016 if (!new_cid)
1017 new_cid_length = info->compatible_id_list.list_size;
1018 else if (info->compatible_id_list.list_size)
1019 new_cid_length = info->compatible_id_list.list_size +
1020 new_cid->length + sizeof(struct acpica_device_id);
1021 else
1022 new_cid_length = sizeof(struct acpica_device_id_list) + new_cid->length;
1023
1024 cid = ACPI_ALLOCATE_ZEROED(new_cid_length);
1025 if (!cid) {
1026 return NULL;
1027 }
1028
1029 cid->list_size = new_cid_length;
1030 cid->count = info->compatible_id_list.count;
1031 if (new_cid)
1032 cid->count++;
1033 next_id_string = (char *) cid->ids + (cid->count * sizeof(struct acpica_device_id));
1034
1035 /* Copy all existing CIDs */
1036
1037 for (i = 0; i < info->compatible_id_list.count; i++) {
1038 cid_length = info->compatible_id_list.ids[i].length;
1039 cid->ids[i].string = next_id_string;
1040 cid->ids[i].length = cid_length;
1041
1042 ACPI_MEMCPY(next_id_string, info->compatible_id_list.ids[i].string,
1043 cid_length);
1044
1045 next_id_string += cid_length;
1046 }
1047
1048 /* Append the new CID */
1049
1050 if (new_cid) {
1051 cid->ids[i].string = next_id_string;
1052 cid->ids[i].length = new_cid->length;
1053
1054 ACPI_MEMCPY(next_id_string, new_cid->string, new_cid->length);
1055 }
1056
1057 return cid;
1058 }
1059
1060 static void acpi_device_set_id(struct acpi_device *device,
1061 struct acpi_device *parent, acpi_handle handle,
1062 int type)
1063 {
1064 struct acpi_device_info *info = NULL;
1065 char *hid = NULL;
1066 char *uid = NULL;
1067 struct acpica_device_id_list *cid_list = NULL;
1068 char *cid_add = NULL;
1069 acpi_status status;
1070
1071 switch (type) {
1072 case ACPI_BUS_TYPE_DEVICE:
1073 status = acpi_get_object_info(handle, &info);
1074 if (ACPI_FAILURE(status)) {
1075 printk(KERN_ERR PREFIX "%s: Error reading device info\n", __func__);
1076 return;
1077 }
1078
1079 if (info->valid & ACPI_VALID_HID)
1080 hid = info->hardware_id.string;
1081 if (info->valid & ACPI_VALID_UID)
1082 uid = info->unique_id.string;
1083 if (info->valid & ACPI_VALID_CID)
1084 cid_list = &info->compatible_id_list;
1085 if (info->valid & ACPI_VALID_ADR) {
1086 device->pnp.bus_address = info->address;
1087 device->flags.bus_address = 1;
1088 }
1089
1090 /* If we have a video/bay/dock device, add our selfdefined
1091 HID to the CID list. Like that the video/bay/dock drivers
1092 will get autoloaded and the device might still match
1093 against another driver.
1094 */
1095 if (acpi_is_video_device(device))
1096 cid_add = ACPI_VIDEO_HID;
1097 else if (ACPI_SUCCESS(acpi_bay_match(device)))
1098 cid_add = ACPI_BAY_HID;
1099 else if (ACPI_SUCCESS(acpi_dock_match(device)))
1100 cid_add = ACPI_DOCK_HID;
1101
1102 break;
1103 case ACPI_BUS_TYPE_POWER:
1104 hid = ACPI_POWER_HID;
1105 break;
1106 case ACPI_BUS_TYPE_PROCESSOR:
1107 hid = ACPI_PROCESSOR_OBJECT_HID;
1108 break;
1109 case ACPI_BUS_TYPE_SYSTEM:
1110 hid = ACPI_SYSTEM_HID;
1111 break;
1112 case ACPI_BUS_TYPE_THERMAL:
1113 hid = ACPI_THERMAL_HID;
1114 break;
1115 case ACPI_BUS_TYPE_POWER_BUTTON:
1116 hid = ACPI_BUTTON_HID_POWERF;
1117 break;
1118 case ACPI_BUS_TYPE_SLEEP_BUTTON:
1119 hid = ACPI_BUTTON_HID_SLEEPF;
1120 break;
1121 }
1122
1123 /*
1124 * \_SB
1125 * ----
1126 * Fix for the system root bus device -- the only root-level device.
1127 */
1128 if (((acpi_handle)parent == ACPI_ROOT_OBJECT) && (type == ACPI_BUS_TYPE_DEVICE)) {
1129 hid = ACPI_BUS_HID;
1130 strcpy(device->pnp.device_name, ACPI_BUS_DEVICE_NAME);
1131 strcpy(device->pnp.device_class, ACPI_BUS_CLASS);
1132 }
1133
1134 if (hid) {
1135 device->pnp.hardware_id = ACPI_ALLOCATE_ZEROED(strlen (hid) + 1);
1136 if (device->pnp.hardware_id) {
1137 strcpy(device->pnp.hardware_id, hid);
1138 device->flags.hardware_id = 1;
1139 }
1140 }
1141 if (!device->flags.hardware_id)
1142 device->pnp.hardware_id = "";
1143
1144 if (uid) {
1145 device->pnp.unique_id = ACPI_ALLOCATE_ZEROED(strlen (uid) + 1);
1146 if (device->pnp.unique_id) {
1147 strcpy(device->pnp.unique_id, uid);
1148 device->flags.unique_id = 1;
1149 }
1150 }
1151 if (!device->flags.unique_id)
1152 device->pnp.unique_id = "";
1153
1154 if (cid_list || cid_add) {
1155 struct acpica_device_id_list *list;
1156
1157 if (cid_add) {
1158 struct acpica_device_id cid;
1159 cid.length = strlen (cid_add) + 1;
1160 cid.string = cid_add;
1161
1162 list = acpi_add_cid(info, &cid);
1163 } else {
1164 list = acpi_add_cid(info, NULL);
1165 }
1166
1167 if (list) {
1168 device->pnp.cid_list = list;
1169 if (cid_add)
1170 device->flags.compatible_ids = 1;
1171 }
1172 }
1173
1174 kfree(info);
1175 }
1176
1177 static int acpi_device_set_context(struct acpi_device *device, int type)
1178 {
1179 acpi_status status = AE_OK;
1180 int result = 0;
1181 /*
1182 * Context
1183 * -------
1184 * Attach this 'struct acpi_device' to the ACPI object. This makes
1185 * resolutions from handle->device very efficient. Note that we need
1186 * to be careful with fixed-feature devices as they all attach to the
1187 * root object.
1188 */
1189 if (type != ACPI_BUS_TYPE_POWER_BUTTON &&
1190 type != ACPI_BUS_TYPE_SLEEP_BUTTON) {
1191 status = acpi_attach_data(device->handle,
1192 acpi_bus_data_handler, device);
1193
1194 if (ACPI_FAILURE(status)) {
1195 printk(KERN_ERR PREFIX "Error attaching device data\n");
1196 result = -ENODEV;
1197 }
1198 }
1199 return result;
1200 }
1201
1202 static int acpi_bus_remove(struct acpi_device *dev, int rmdevice)
1203 {
1204 if (!dev)
1205 return -EINVAL;
1206
1207 dev->removal_type = ACPI_BUS_REMOVAL_EJECT;
1208 device_release_driver(&dev->dev);
1209
1210 if (!rmdevice)
1211 return 0;
1212
1213 /*
1214 * unbind _ADR-Based Devices when hot removal
1215 */
1216 if (dev->flags.bus_address) {
1217 if ((dev->parent) && (dev->parent->ops.unbind))
1218 dev->parent->ops.unbind(dev);
1219 }
1220 acpi_device_unregister(dev, ACPI_BUS_REMOVAL_EJECT);
1221
1222 return 0;
1223 }
1224
1225 static int
1226 acpi_add_single_object(struct acpi_device **child,
1227 struct acpi_device *parent, acpi_handle handle, int type,
1228 struct acpi_bus_ops *ops)
1229 {
1230 int result = 0;
1231 struct acpi_device *device = NULL;
1232
1233
1234 if (!child)
1235 return -EINVAL;
1236
1237 device = kzalloc(sizeof(struct acpi_device), GFP_KERNEL);
1238 if (!device) {
1239 printk(KERN_ERR PREFIX "Memory allocation error\n");
1240 return -ENOMEM;
1241 }
1242
1243 device->handle = handle;
1244 device->parent = parent;
1245 device->bus_ops = *ops; /* workround for not call .start */
1246
1247
1248 acpi_device_get_busid(device, handle, type);
1249
1250 /*
1251 * Flags
1252 * -----
1253 * Get prior to calling acpi_bus_get_status() so we know whether
1254 * or not _STA is present. Note that we only look for object
1255 * handles -- cannot evaluate objects until we know the device is
1256 * present and properly initialized.
1257 */
1258 result = acpi_bus_get_flags(device);
1259 if (result)
1260 goto end;
1261
1262 /*
1263 * Status
1264 * ------
1265 * See if the device is present. We always assume that non-Device
1266 * and non-Processor objects (e.g. thermal zones, power resources,
1267 * etc.) are present, functioning, etc. (at least when parent object
1268 * is present). Note that _STA has a different meaning for some
1269 * objects (e.g. power resources) so we need to be careful how we use
1270 * it.
1271 */
1272 switch (type) {
1273 case ACPI_BUS_TYPE_PROCESSOR:
1274 case ACPI_BUS_TYPE_DEVICE:
1275 result = acpi_bus_get_status(device);
1276 if (ACPI_FAILURE(result)) {
1277 result = -ENODEV;
1278 goto end;
1279 }
1280 /*
1281 * When the device is neither present nor functional, the
1282 * device should not be added to Linux ACPI device tree.
1283 * When the status of the device is not present but functinal,
1284 * it should be added to Linux ACPI tree. For example : bay
1285 * device , dock device.
1286 * In such conditions it is unncessary to check whether it is
1287 * bay device or dock device.
1288 */
1289 if (!device->status.present && !device->status.functional) {
1290 result = -ENODEV;
1291 goto end;
1292 }
1293 break;
1294 default:
1295 STRUCT_TO_INT(device->status) =
1296 ACPI_STA_DEVICE_PRESENT | ACPI_STA_DEVICE_ENABLED |
1297 ACPI_STA_DEVICE_UI | ACPI_STA_DEVICE_FUNCTIONING;
1298 break;
1299 }
1300
1301 /*
1302 * Initialize Device
1303 * -----------------
1304 * TBD: Synch with Core's enumeration/initialization process.
1305 */
1306
1307 /*
1308 * Hardware ID, Unique ID, & Bus Address
1309 * -------------------------------------
1310 */
1311 acpi_device_set_id(device, parent, handle, type);
1312
1313 /*
1314 * Power Management
1315 * ----------------
1316 */
1317 if (device->flags.power_manageable) {
1318 result = acpi_bus_get_power_flags(device);
1319 if (result)
1320 goto end;
1321 }
1322
1323 /*
1324 * Wakeup device management
1325 *-----------------------
1326 */
1327 if (device->flags.wake_capable) {
1328 result = acpi_bus_get_wakeup_device_flags(device);
1329 if (result)
1330 goto end;
1331 }
1332
1333 /*
1334 * Performance Management
1335 * ----------------------
1336 */
1337 if (device->flags.performance_manageable) {
1338 result = acpi_bus_get_perf_flags(device);
1339 if (result)
1340 goto end;
1341 }
1342
1343 if ((result = acpi_device_set_context(device, type)))
1344 goto end;
1345
1346 result = acpi_device_register(device, parent);
1347
1348 /*
1349 * Bind _ADR-Based Devices when hot add
1350 */
1351 if (device->flags.bus_address) {
1352 if (device->parent && device->parent->ops.bind)
1353 device->parent->ops.bind(device);
1354 }
1355
1356 end:
1357 if (!result)
1358 *child = device;
1359 else
1360 acpi_device_release(&device->dev);
1361
1362 return result;
1363 }
1364
1365 static int acpi_bus_scan(struct acpi_device *start, struct acpi_bus_ops *ops)
1366 {
1367 acpi_status status = AE_OK;
1368 struct acpi_device *parent = NULL;
1369 struct acpi_device *child = NULL;
1370 acpi_handle phandle = NULL;
1371 acpi_handle chandle = NULL;
1372 acpi_object_type type = 0;
1373 u32 level = 1;
1374
1375
1376 if (!start)
1377 return -EINVAL;
1378
1379 parent = start;
1380 phandle = start->handle;
1381
1382 /*
1383 * Parse through the ACPI namespace, identify all 'devices', and
1384 * create a new 'struct acpi_device' for each.
1385 */
1386 while ((level > 0) && parent) {
1387
1388 status = acpi_get_next_object(ACPI_TYPE_ANY, phandle,
1389 chandle, &chandle);
1390
1391 /*
1392 * If this scope is exhausted then move our way back up.
1393 */
1394 if (ACPI_FAILURE(status)) {
1395 level--;
1396 chandle = phandle;
1397 acpi_get_parent(phandle, &phandle);
1398 if (parent->parent)
1399 parent = parent->parent;
1400 continue;
1401 }
1402
1403 status = acpi_get_type(chandle, &type);
1404 if (ACPI_FAILURE(status))
1405 continue;
1406
1407 /*
1408 * If this is a scope object then parse it (depth-first).
1409 */
1410 if (type == ACPI_TYPE_LOCAL_SCOPE) {
1411 level++;
1412 phandle = chandle;
1413 chandle = NULL;
1414 continue;
1415 }
1416
1417 /*
1418 * We're only interested in objects that we consider 'devices'.
1419 */
1420 switch (type) {
1421 case ACPI_TYPE_DEVICE:
1422 type = ACPI_BUS_TYPE_DEVICE;
1423 break;
1424 case ACPI_TYPE_PROCESSOR:
1425 type = ACPI_BUS_TYPE_PROCESSOR;
1426 break;
1427 case ACPI_TYPE_THERMAL:
1428 type = ACPI_BUS_TYPE_THERMAL;
1429 break;
1430 case ACPI_TYPE_POWER:
1431 type = ACPI_BUS_TYPE_POWER;
1432 break;
1433 default:
1434 continue;
1435 }
1436
1437 if (ops->acpi_op_add)
1438 status = acpi_add_single_object(&child, parent,
1439 chandle, type, ops);
1440 else
1441 status = acpi_bus_get_device(chandle, &child);
1442
1443 if (ACPI_FAILURE(status))
1444 continue;
1445
1446 if (ops->acpi_op_start && !(ops->acpi_op_add)) {
1447 status = acpi_start_single_object(child);
1448 if (ACPI_FAILURE(status))
1449 continue;
1450 }
1451
1452 /*
1453 * If the device is present, enabled, and functioning then
1454 * parse its scope (depth-first). Note that we need to
1455 * represent absent devices to facilitate PnP notifications
1456 * -- but only the subtree head (not all of its children,
1457 * which will be enumerated when the parent is inserted).
1458 *
1459 * TBD: Need notifications and other detection mechanisms
1460 * in place before we can fully implement this.
1461 */
1462 /*
1463 * When the device is not present but functional, it is also
1464 * necessary to scan the children of this device.
1465 */
1466 if (child->status.present || (!child->status.present &&
1467 child->status.functional)) {
1468 status = acpi_get_next_object(ACPI_TYPE_ANY, chandle,
1469 NULL, NULL);
1470 if (ACPI_SUCCESS(status)) {
1471 level++;
1472 phandle = chandle;
1473 chandle = NULL;
1474 parent = child;
1475 }
1476 }
1477 }
1478
1479 return 0;
1480 }
1481
1482 int
1483 acpi_bus_add(struct acpi_device **child,
1484 struct acpi_device *parent, acpi_handle handle, int type)
1485 {
1486 int result;
1487 struct acpi_bus_ops ops;
1488
1489 memset(&ops, 0, sizeof(ops));
1490 ops.acpi_op_add = 1;
1491
1492 result = acpi_add_single_object(child, parent, handle, type, &ops);
1493 if (!result)
1494 result = acpi_bus_scan(*child, &ops);
1495
1496 return result;
1497 }
1498 EXPORT_SYMBOL(acpi_bus_add);
1499
1500 int acpi_bus_start(struct acpi_device *device)
1501 {
1502 int result;
1503 struct acpi_bus_ops ops;
1504
1505
1506 if (!device)
1507 return -EINVAL;
1508
1509 result = acpi_start_single_object(device);
1510 if (!result) {
1511 memset(&ops, 0, sizeof(ops));
1512 ops.acpi_op_start = 1;
1513 result = acpi_bus_scan(device, &ops);
1514 }
1515 return result;
1516 }
1517 EXPORT_SYMBOL(acpi_bus_start);
1518
1519 int acpi_bus_trim(struct acpi_device *start, int rmdevice)
1520 {
1521 acpi_status status;
1522 struct acpi_device *parent, *child;
1523 acpi_handle phandle, chandle;
1524 acpi_object_type type;
1525 u32 level = 1;
1526 int err = 0;
1527
1528 parent = start;
1529 phandle = start->handle;
1530 child = chandle = NULL;
1531
1532 while ((level > 0) && parent && (!err)) {
1533 status = acpi_get_next_object(ACPI_TYPE_ANY, phandle,
1534 chandle, &chandle);
1535
1536 /*
1537 * If this scope is exhausted then move our way back up.
1538 */
1539 if (ACPI_FAILURE(status)) {
1540 level--;
1541 chandle = phandle;
1542 acpi_get_parent(phandle, &phandle);
1543 child = parent;
1544 parent = parent->parent;
1545
1546 if (level == 0)
1547 err = acpi_bus_remove(child, rmdevice);
1548 else
1549 err = acpi_bus_remove(child, 1);
1550
1551 continue;
1552 }
1553
1554 status = acpi_get_type(chandle, &type);
1555 if (ACPI_FAILURE(status)) {
1556 continue;
1557 }
1558 /*
1559 * If there is a device corresponding to chandle then
1560 * parse it (depth-first).
1561 */
1562 if (acpi_bus_get_device(chandle, &child) == 0) {
1563 level++;
1564 phandle = chandle;
1565 chandle = NULL;
1566 parent = child;
1567 }
1568 continue;
1569 }
1570 return err;
1571 }
1572 EXPORT_SYMBOL_GPL(acpi_bus_trim);
1573
1574 static int acpi_bus_scan_fixed(struct acpi_device *root)
1575 {
1576 int result = 0;
1577 struct acpi_device *device = NULL;
1578 struct acpi_bus_ops ops;
1579
1580 if (!root)
1581 return -ENODEV;
1582
1583 memset(&ops, 0, sizeof(ops));
1584 ops.acpi_op_add = 1;
1585 ops.acpi_op_start = 1;
1586
1587 /*
1588 * Enumerate all fixed-feature devices.
1589 */
1590 if ((acpi_gbl_FADT.flags & ACPI_FADT_POWER_BUTTON) == 0) {
1591 result = acpi_add_single_object(&device, acpi_root,
1592 NULL,
1593 ACPI_BUS_TYPE_POWER_BUTTON,
1594 &ops);
1595 }
1596
1597 if ((acpi_gbl_FADT.flags & ACPI_FADT_SLEEP_BUTTON) == 0) {
1598 result = acpi_add_single_object(&device, acpi_root,
1599 NULL,
1600 ACPI_BUS_TYPE_SLEEP_BUTTON,
1601 &ops);
1602 }
1603
1604 return result;
1605 }
1606
1607 int __init acpi_scan_init(void)
1608 {
1609 int result;
1610 struct acpi_bus_ops ops;
1611
1612 memset(&ops, 0, sizeof(ops));
1613 ops.acpi_op_add = 1;
1614 ops.acpi_op_start = 1;
1615
1616 result = bus_register(&acpi_bus_type);
1617 if (result) {
1618 /* We don't want to quit even if we failed to add suspend/resume */
1619 printk(KERN_ERR PREFIX "Could not register bus type\n");
1620 }
1621
1622 /*
1623 * Create the root device in the bus's device tree
1624 */
1625 result = acpi_add_single_object(&acpi_root, NULL, ACPI_ROOT_OBJECT,
1626 ACPI_BUS_TYPE_SYSTEM, &ops);
1627 if (result)
1628 goto Done;
1629
1630 /*
1631 * Enumerate devices in the ACPI namespace.
1632 */
1633 result = acpi_bus_scan_fixed(acpi_root);
1634
1635 if (!result)
1636 result = acpi_bus_scan(acpi_root, &ops);
1637
1638 if (result)
1639 acpi_device_unregister(acpi_root, ACPI_BUS_REMOVAL_NORMAL);
1640
1641 Done:
1642 return result;
1643 }
Linux kernel - Deliverables
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