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