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d59a60736e1c20efe71e9014576266e433d74272
[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/slab.h>
8 #include <linux/kernel.h>
9 #include <linux/acpi.h>
10 #include <linux/signal.h>
11 #include <linux/kthread.h>
12 #include <linux/dmi.h>
13 #include <linux/nls.h>
14
15 #include <acpi/acpi_drivers.h>
16
17 #include "internal.h"
18
19 #define _COMPONENT ACPI_BUS_COMPONENT
20 ACPI_MODULE_NAME("scan");
21 #define STRUCT_TO_INT(s) (*((int*)&s))
22 extern struct acpi_device *acpi_root;
23
24 #define ACPI_BUS_CLASS "system_bus"
25 #define ACPI_BUS_HID "LNXSYBUS"
26 #define ACPI_BUS_DEVICE_NAME "System Bus"
27
28 #define ACPI_IS_ROOT_DEVICE(device) (!(device)->parent)
29
30 static const char *dummy_hid = "device";
31
32 /*
33 * The following ACPI IDs are known to be suitable for representing as
34 * platform devices.
35 */
36 static const struct acpi_device_id acpi_platform_device_ids[] = {
37
38 { "PNP0D40" },
39
40 { }
41 };
42
43 static LIST_HEAD(acpi_device_list);
44 static LIST_HEAD(acpi_bus_id_list);
45 DEFINE_MUTEX(acpi_device_lock);
46 LIST_HEAD(acpi_wakeup_device_list);
47
48 struct acpi_device_bus_id{
49 char bus_id[15];
50 unsigned int instance_no;
51 struct list_head node;
52 };
53
54 /*
55 * Creates hid/cid(s) string needed for modalias and uevent
56 * e.g. on a device with hid:IBM0001 and cid:ACPI0001 you get:
57 * char *modalias: "acpi:IBM0001:ACPI0001"
58 */
59 static int create_modalias(struct acpi_device *acpi_dev, char *modalias,
60 int size)
61 {
62 int len;
63 int count;
64 struct acpi_hardware_id *id;
65
66 if (list_empty(&acpi_dev->pnp.ids))
67 return 0;
68
69 len = snprintf(modalias, size, "acpi:");
70 size -= len;
71
72 list_for_each_entry(id, &acpi_dev->pnp.ids, list) {
73 count = snprintf(&modalias[len], size, "%s:", id->id);
74 if (count < 0 || count >= size)
75 return -EINVAL;
76 len += count;
77 size -= count;
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 /**
99 * acpi_bus_hot_remove_device: hot-remove a device and its children
100 * @context: struct acpi_eject_event pointer (freed in this func)
101 *
102 * Hot-remove a device and its children. This function frees up the
103 * memory space passed by arg context, so that the caller may call
104 * this function asynchronously through acpi_os_hotplug_execute().
105 */
106 void acpi_bus_hot_remove_device(void *context)
107 {
108 struct acpi_eject_event *ej_event = (struct acpi_eject_event *) context;
109 struct acpi_device *device;
110 acpi_handle handle = ej_event->handle;
111 struct acpi_object_list arg_list;
112 union acpi_object arg;
113 acpi_status status = AE_OK;
114 u32 ost_code = ACPI_OST_SC_NON_SPECIFIC_FAILURE; /* default */
115
116 if (acpi_bus_get_device(handle, &device))
117 goto err_out;
118
119 if (!device)
120 goto err_out;
121
122 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
123 "Hot-removing device %s...\n", dev_name(&device->dev)));
124
125 if (acpi_bus_trim(device, 1)) {
126 printk(KERN_ERR PREFIX
127 "Removing device failed\n");
128 goto err_out;
129 }
130
131 /* power off device */
132 status = acpi_evaluate_object(handle, "_PS3", NULL, NULL);
133 if (ACPI_FAILURE(status) && status != AE_NOT_FOUND)
134 printk(KERN_WARNING PREFIX
135 "Power-off device failed\n");
136
137 if (device->flags.lockable) {
138 arg_list.count = 1;
139 arg_list.pointer = &arg;
140 arg.type = ACPI_TYPE_INTEGER;
141 arg.integer.value = 0;
142 acpi_evaluate_object(handle, "_LCK", &arg_list, NULL);
143 }
144
145 arg_list.count = 1;
146 arg_list.pointer = &arg;
147 arg.type = ACPI_TYPE_INTEGER;
148 arg.integer.value = 1;
149
150 /*
151 * TBD: _EJD support.
152 */
153 status = acpi_evaluate_object(handle, "_EJ0", &arg_list, NULL);
154 if (ACPI_FAILURE(status)) {
155 if (status != AE_NOT_FOUND)
156 printk(KERN_WARNING PREFIX
157 "Eject device failed\n");
158 goto err_out;
159 }
160
161 kfree(context);
162 return;
163
164 err_out:
165 /* Inform firmware the hot-remove operation has completed w/ error */
166 (void) acpi_evaluate_hotplug_ost(handle,
167 ej_event->event, ost_code, NULL);
168 kfree(context);
169 return;
170 }
171
172 static ssize_t
173 acpi_eject_store(struct device *d, struct device_attribute *attr,
174 const char *buf, size_t count)
175 {
176 int ret = count;
177 acpi_status status;
178 acpi_object_type type = 0;
179 struct acpi_device *acpi_device = to_acpi_device(d);
180 struct acpi_eject_event *ej_event;
181
182 if ((!count) || (buf[0] != '1')) {
183 return -EINVAL;
184 }
185 #ifndef FORCE_EJECT
186 if (acpi_device->driver == NULL) {
187 ret = -ENODEV;
188 goto err;
189 }
190 #endif
191 status = acpi_get_type(acpi_device->handle, &type);
192 if (ACPI_FAILURE(status) || (!acpi_device->flags.ejectable)) {
193 ret = -ENODEV;
194 goto err;
195 }
196
197 ej_event = kmalloc(sizeof(*ej_event), GFP_KERNEL);
198 if (!ej_event) {
199 ret = -ENOMEM;
200 goto err;
201 }
202
203 ej_event->handle = acpi_device->handle;
204 if (acpi_device->flags.eject_pending) {
205 /* event originated from ACPI eject notification */
206 ej_event->event = ACPI_NOTIFY_EJECT_REQUEST;
207 acpi_device->flags.eject_pending = 0;
208 } else {
209 /* event originated from user */
210 ej_event->event = ACPI_OST_EC_OSPM_EJECT;
211 (void) acpi_evaluate_hotplug_ost(ej_event->handle,
212 ej_event->event, ACPI_OST_SC_EJECT_IN_PROGRESS, NULL);
213 }
214
215 acpi_os_hotplug_execute(acpi_bus_hot_remove_device, (void *)ej_event);
216 err:
217 return ret;
218 }
219
220 static DEVICE_ATTR(eject, 0200, NULL, acpi_eject_store);
221
222 static ssize_t
223 acpi_device_hid_show(struct device *dev, struct device_attribute *attr, char *buf) {
224 struct acpi_device *acpi_dev = to_acpi_device(dev);
225
226 return sprintf(buf, "%s\n", acpi_device_hid(acpi_dev));
227 }
228 static DEVICE_ATTR(hid, 0444, acpi_device_hid_show, NULL);
229
230 static ssize_t
231 acpi_device_path_show(struct device *dev, struct device_attribute *attr, char *buf) {
232 struct acpi_device *acpi_dev = to_acpi_device(dev);
233 struct acpi_buffer path = {ACPI_ALLOCATE_BUFFER, NULL};
234 int result;
235
236 result = acpi_get_name(acpi_dev->handle, ACPI_FULL_PATHNAME, &path);
237 if (result)
238 goto end;
239
240 result = sprintf(buf, "%s\n", (char*)path.pointer);
241 kfree(path.pointer);
242 end:
243 return result;
244 }
245 static DEVICE_ATTR(path, 0444, acpi_device_path_show, NULL);
246
247 /* sysfs file that shows description text from the ACPI _STR method */
248 static ssize_t description_show(struct device *dev,
249 struct device_attribute *attr,
250 char *buf) {
251 struct acpi_device *acpi_dev = to_acpi_device(dev);
252 int result;
253
254 if (acpi_dev->pnp.str_obj == NULL)
255 return 0;
256
257 /*
258 * The _STR object contains a Unicode identifier for a device.
259 * We need to convert to utf-8 so it can be displayed.
260 */
261 result = utf16s_to_utf8s(
262 (wchar_t *)acpi_dev->pnp.str_obj->buffer.pointer,
263 acpi_dev->pnp.str_obj->buffer.length,
264 UTF16_LITTLE_ENDIAN, buf,
265 PAGE_SIZE);
266
267 buf[result++] = '\n';
268
269 return result;
270 }
271 static DEVICE_ATTR(description, 0444, description_show, NULL);
272
273 static int acpi_device_setup_files(struct acpi_device *dev)
274 {
275 struct acpi_buffer buffer = {ACPI_ALLOCATE_BUFFER, NULL};
276 acpi_status status;
277 acpi_handle temp;
278 int result = 0;
279
280 /*
281 * Devices gotten from FADT don't have a "path" attribute
282 */
283 if (dev->handle) {
284 result = device_create_file(&dev->dev, &dev_attr_path);
285 if (result)
286 goto end;
287 }
288
289 if (!list_empty(&dev->pnp.ids)) {
290 result = device_create_file(&dev->dev, &dev_attr_hid);
291 if (result)
292 goto end;
293
294 result = device_create_file(&dev->dev, &dev_attr_modalias);
295 if (result)
296 goto end;
297 }
298
299 /*
300 * If device has _STR, 'description' file is created
301 */
302 status = acpi_get_handle(dev->handle, "_STR", &temp);
303 if (ACPI_SUCCESS(status)) {
304 status = acpi_evaluate_object(dev->handle, "_STR",
305 NULL, &buffer);
306 if (ACPI_FAILURE(status))
307 buffer.pointer = NULL;
308 dev->pnp.str_obj = buffer.pointer;
309 result = device_create_file(&dev->dev, &dev_attr_description);
310 if (result)
311 goto end;
312 }
313
314 /*
315 * If device has _EJ0, 'eject' file is created that is used to trigger
316 * hot-removal function from userland.
317 */
318 status = acpi_get_handle(dev->handle, "_EJ0", &temp);
319 if (ACPI_SUCCESS(status))
320 result = device_create_file(&dev->dev, &dev_attr_eject);
321 end:
322 return result;
323 }
324
325 static void acpi_device_remove_files(struct acpi_device *dev)
326 {
327 acpi_status status;
328 acpi_handle temp;
329
330 /*
331 * If device has _STR, remove 'description' file
332 */
333 status = acpi_get_handle(dev->handle, "_STR", &temp);
334 if (ACPI_SUCCESS(status)) {
335 kfree(dev->pnp.str_obj);
336 device_remove_file(&dev->dev, &dev_attr_description);
337 }
338 /*
339 * If device has _EJ0, remove 'eject' file.
340 */
341 status = acpi_get_handle(dev->handle, "_EJ0", &temp);
342 if (ACPI_SUCCESS(status))
343 device_remove_file(&dev->dev, &dev_attr_eject);
344
345 device_remove_file(&dev->dev, &dev_attr_modalias);
346 device_remove_file(&dev->dev, &dev_attr_hid);
347 if (dev->handle)
348 device_remove_file(&dev->dev, &dev_attr_path);
349 }
350 /* --------------------------------------------------------------------------
351 ACPI Bus operations
352 -------------------------------------------------------------------------- */
353
354 static const struct acpi_device_id *__acpi_match_device(
355 struct acpi_device *device, const struct acpi_device_id *ids)
356 {
357 const struct acpi_device_id *id;
358 struct acpi_hardware_id *hwid;
359
360 /*
361 * If the device is not present, it is unnecessary to load device
362 * driver for it.
363 */
364 if (!device->status.present)
365 return NULL;
366
367 for (id = ids; id->id[0]; id++)
368 list_for_each_entry(hwid, &device->pnp.ids, list)
369 if (!strcmp((char *) id->id, hwid->id))
370 return id;
371
372 return NULL;
373 }
374
375 /**
376 * acpi_match_device - Match a struct device against a given list of ACPI IDs
377 * @ids: Array of struct acpi_device_id object to match against.
378 * @dev: The device structure to match.
379 *
380 * Check if @dev has a valid ACPI handle and if there is a struct acpi_device
381 * object for that handle and use that object to match against a given list of
382 * device IDs.
383 *
384 * Return a pointer to the first matching ID on success or %NULL on failure.
385 */
386 const struct acpi_device_id *acpi_match_device(const struct acpi_device_id *ids,
387 const struct device *dev)
388 {
389 struct acpi_device *adev;
390
391 if (!ids || !ACPI_HANDLE(dev)
392 || ACPI_FAILURE(acpi_bus_get_device(ACPI_HANDLE(dev), &adev)))
393 return NULL;
394
395 return __acpi_match_device(adev, ids);
396 }
397 EXPORT_SYMBOL_GPL(acpi_match_device);
398
399 int acpi_match_device_ids(struct acpi_device *device,
400 const struct acpi_device_id *ids)
401 {
402 return __acpi_match_device(device, ids) ? 0 : -ENOENT;
403 }
404 EXPORT_SYMBOL(acpi_match_device_ids);
405
406 static void acpi_free_ids(struct acpi_device *device)
407 {
408 struct acpi_hardware_id *id, *tmp;
409
410 list_for_each_entry_safe(id, tmp, &device->pnp.ids, list) {
411 kfree(id->id);
412 kfree(id);
413 }
414 }
415
416 static void acpi_device_release(struct device *dev)
417 {
418 struct acpi_device *acpi_dev = to_acpi_device(dev);
419
420 acpi_free_ids(acpi_dev);
421 kfree(acpi_dev);
422 }
423
424 static int acpi_bus_match(struct device *dev, struct device_driver *drv)
425 {
426 struct acpi_device *acpi_dev = to_acpi_device(dev);
427 struct acpi_driver *acpi_drv = to_acpi_driver(drv);
428
429 return !acpi_match_device_ids(acpi_dev, acpi_drv->ids);
430 }
431
432 static int acpi_device_uevent(struct device *dev, struct kobj_uevent_env *env)
433 {
434 struct acpi_device *acpi_dev = to_acpi_device(dev);
435 int len;
436
437 if (list_empty(&acpi_dev->pnp.ids))
438 return 0;
439
440 if (add_uevent_var(env, "MODALIAS="))
441 return -ENOMEM;
442 len = create_modalias(acpi_dev, &env->buf[env->buflen - 1],
443 sizeof(env->buf) - env->buflen);
444 if (len >= (sizeof(env->buf) - env->buflen))
445 return -ENOMEM;
446 env->buflen += len;
447 return 0;
448 }
449
450 static void acpi_device_notify(acpi_handle handle, u32 event, void *data)
451 {
452 struct acpi_device *device = data;
453
454 device->driver->ops.notify(device, event);
455 }
456
457 static acpi_status acpi_device_notify_fixed(void *data)
458 {
459 struct acpi_device *device = data;
460
461 /* Fixed hardware devices have no handles */
462 acpi_device_notify(NULL, ACPI_FIXED_HARDWARE_EVENT, device);
463 return AE_OK;
464 }
465
466 static int acpi_device_install_notify_handler(struct acpi_device *device)
467 {
468 acpi_status status;
469
470 if (device->device_type == ACPI_BUS_TYPE_POWER_BUTTON)
471 status =
472 acpi_install_fixed_event_handler(ACPI_EVENT_POWER_BUTTON,
473 acpi_device_notify_fixed,
474 device);
475 else if (device->device_type == ACPI_BUS_TYPE_SLEEP_BUTTON)
476 status =
477 acpi_install_fixed_event_handler(ACPI_EVENT_SLEEP_BUTTON,
478 acpi_device_notify_fixed,
479 device);
480 else
481 status = acpi_install_notify_handler(device->handle,
482 ACPI_DEVICE_NOTIFY,
483 acpi_device_notify,
484 device);
485
486 if (ACPI_FAILURE(status))
487 return -EINVAL;
488 return 0;
489 }
490
491 static void acpi_device_remove_notify_handler(struct acpi_device *device)
492 {
493 if (device->device_type == ACPI_BUS_TYPE_POWER_BUTTON)
494 acpi_remove_fixed_event_handler(ACPI_EVENT_POWER_BUTTON,
495 acpi_device_notify_fixed);
496 else if (device->device_type == ACPI_BUS_TYPE_SLEEP_BUTTON)
497 acpi_remove_fixed_event_handler(ACPI_EVENT_SLEEP_BUTTON,
498 acpi_device_notify_fixed);
499 else
500 acpi_remove_notify_handler(device->handle, ACPI_DEVICE_NOTIFY,
501 acpi_device_notify);
502 }
503
504 static int acpi_bus_driver_init(struct acpi_device *, struct acpi_driver *);
505 static int acpi_start_single_object(struct acpi_device *);
506 static int acpi_device_probe(struct device * dev)
507 {
508 struct acpi_device *acpi_dev = to_acpi_device(dev);
509 struct acpi_driver *acpi_drv = to_acpi_driver(dev->driver);
510 int ret;
511
512 ret = acpi_bus_driver_init(acpi_dev, acpi_drv);
513 if (!ret) {
514 if (acpi_dev->bus_ops.acpi_op_start)
515 acpi_start_single_object(acpi_dev);
516
517 if (acpi_drv->ops.notify) {
518 ret = acpi_device_install_notify_handler(acpi_dev);
519 if (ret) {
520 if (acpi_drv->ops.remove)
521 acpi_drv->ops.remove(acpi_dev,
522 acpi_dev->removal_type);
523 return ret;
524 }
525 }
526
527 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
528 "Found driver [%s] for device [%s]\n",
529 acpi_drv->name, acpi_dev->pnp.bus_id));
530 get_device(dev);
531 }
532 return ret;
533 }
534
535 static int acpi_device_remove(struct device * dev)
536 {
537 struct acpi_device *acpi_dev = to_acpi_device(dev);
538 struct acpi_driver *acpi_drv = acpi_dev->driver;
539
540 if (acpi_drv) {
541 if (acpi_drv->ops.notify)
542 acpi_device_remove_notify_handler(acpi_dev);
543 if (acpi_drv->ops.remove)
544 acpi_drv->ops.remove(acpi_dev, acpi_dev->removal_type);
545 }
546 acpi_dev->driver = NULL;
547 acpi_dev->driver_data = NULL;
548
549 put_device(dev);
550 return 0;
551 }
552
553 struct bus_type acpi_bus_type = {
554 .name = "acpi",
555 .match = acpi_bus_match,
556 .probe = acpi_device_probe,
557 .remove = acpi_device_remove,
558 .uevent = acpi_device_uevent,
559 };
560
561 static int acpi_device_register(struct acpi_device *device)
562 {
563 int result;
564 struct acpi_device_bus_id *acpi_device_bus_id, *new_bus_id;
565 int found = 0;
566
567 /*
568 * Linkage
569 * -------
570 * Link this device to its parent and siblings.
571 */
572 INIT_LIST_HEAD(&device->children);
573 INIT_LIST_HEAD(&device->node);
574 INIT_LIST_HEAD(&device->wakeup_list);
575 INIT_LIST_HEAD(&device->physical_node_list);
576 mutex_init(&device->physical_node_lock);
577
578 new_bus_id = kzalloc(sizeof(struct acpi_device_bus_id), GFP_KERNEL);
579 if (!new_bus_id) {
580 printk(KERN_ERR PREFIX "Memory allocation error\n");
581 return -ENOMEM;
582 }
583
584 mutex_lock(&acpi_device_lock);
585 /*
586 * Find suitable bus_id and instance number in acpi_bus_id_list
587 * If failed, create one and link it into acpi_bus_id_list
588 */
589 list_for_each_entry(acpi_device_bus_id, &acpi_bus_id_list, node) {
590 if (!strcmp(acpi_device_bus_id->bus_id,
591 acpi_device_hid(device))) {
592 acpi_device_bus_id->instance_no++;
593 found = 1;
594 kfree(new_bus_id);
595 break;
596 }
597 }
598 if (!found) {
599 acpi_device_bus_id = new_bus_id;
600 strcpy(acpi_device_bus_id->bus_id, acpi_device_hid(device));
601 acpi_device_bus_id->instance_no = 0;
602 list_add_tail(&acpi_device_bus_id->node, &acpi_bus_id_list);
603 }
604 dev_set_name(&device->dev, "%s:%02x", acpi_device_bus_id->bus_id, acpi_device_bus_id->instance_no);
605
606 if (device->parent)
607 list_add_tail(&device->node, &device->parent->children);
608
609 if (device->wakeup.flags.valid)
610 list_add_tail(&device->wakeup_list, &acpi_wakeup_device_list);
611 mutex_unlock(&acpi_device_lock);
612
613 if (device->parent)
614 device->dev.parent = &device->parent->dev;
615 device->dev.bus = &acpi_bus_type;
616 device->dev.release = &acpi_device_release;
617 result = device_register(&device->dev);
618 if (result) {
619 dev_err(&device->dev, "Error registering device\n");
620 goto end;
621 }
622
623 result = acpi_device_setup_files(device);
624 if (result)
625 printk(KERN_ERR PREFIX "Error creating sysfs interface for device %s\n",
626 dev_name(&device->dev));
627
628 device->removal_type = ACPI_BUS_REMOVAL_NORMAL;
629 return 0;
630 end:
631 mutex_lock(&acpi_device_lock);
632 if (device->parent)
633 list_del(&device->node);
634 list_del(&device->wakeup_list);
635 mutex_unlock(&acpi_device_lock);
636 return result;
637 }
638
639 static void acpi_device_unregister(struct acpi_device *device, int type)
640 {
641 mutex_lock(&acpi_device_lock);
642 if (device->parent)
643 list_del(&device->node);
644
645 list_del(&device->wakeup_list);
646 mutex_unlock(&acpi_device_lock);
647
648 acpi_detach_data(device->handle, acpi_bus_data_handler);
649
650 acpi_device_remove_files(device);
651 device_unregister(&device->dev);
652 }
653
654 /* --------------------------------------------------------------------------
655 Driver Management
656 -------------------------------------------------------------------------- */
657 /**
658 * acpi_bus_driver_init - add a device to a driver
659 * @device: the device to add and initialize
660 * @driver: driver for the device
661 *
662 * Used to initialize a device via its device driver. Called whenever a
663 * driver is bound to a device. Invokes the driver's add() ops.
664 */
665 static int
666 acpi_bus_driver_init(struct acpi_device *device, struct acpi_driver *driver)
667 {
668 int result = 0;
669
670 if (!device || !driver)
671 return -EINVAL;
672
673 if (!driver->ops.add)
674 return -ENOSYS;
675
676 result = driver->ops.add(device);
677 if (result) {
678 device->driver = NULL;
679 device->driver_data = NULL;
680 return result;
681 }
682
683 device->driver = driver;
684
685 /*
686 * TBD - Configuration Management: Assign resources to device based
687 * upon possible configuration and currently allocated resources.
688 */
689
690 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
691 "Driver successfully bound to device\n"));
692 return 0;
693 }
694
695 static int acpi_start_single_object(struct acpi_device *device)
696 {
697 int result = 0;
698 struct acpi_driver *driver;
699
700
701 if (!(driver = device->driver))
702 return 0;
703
704 if (driver->ops.start) {
705 result = driver->ops.start(device);
706 if (result && driver->ops.remove)
707 driver->ops.remove(device, ACPI_BUS_REMOVAL_NORMAL);
708 }
709
710 return result;
711 }
712
713 /**
714 * acpi_bus_register_driver - register a driver with the ACPI bus
715 * @driver: driver being registered
716 *
717 * Registers a driver with the ACPI bus. Searches the namespace for all
718 * devices that match the driver's criteria and binds. Returns zero for
719 * success or a negative error status for failure.
720 */
721 int acpi_bus_register_driver(struct acpi_driver *driver)
722 {
723 int ret;
724
725 if (acpi_disabled)
726 return -ENODEV;
727 driver->drv.name = driver->name;
728 driver->drv.bus = &acpi_bus_type;
729 driver->drv.owner = driver->owner;
730
731 ret = driver_register(&driver->drv);
732 return ret;
733 }
734
735 EXPORT_SYMBOL(acpi_bus_register_driver);
736
737 /**
738 * acpi_bus_unregister_driver - unregisters a driver with the APIC bus
739 * @driver: driver to unregister
740 *
741 * Unregisters a driver with the ACPI bus. Searches the namespace for all
742 * devices that match the driver's criteria and unbinds.
743 */
744 void acpi_bus_unregister_driver(struct acpi_driver *driver)
745 {
746 driver_unregister(&driver->drv);
747 }
748
749 EXPORT_SYMBOL(acpi_bus_unregister_driver);
750
751 /* --------------------------------------------------------------------------
752 Device Enumeration
753 -------------------------------------------------------------------------- */
754 static struct acpi_device *acpi_bus_get_parent(acpi_handle handle)
755 {
756 acpi_status status;
757 int ret;
758 struct acpi_device *device;
759
760 /*
761 * Fixed hardware devices do not appear in the namespace and do not
762 * have handles, but we fabricate acpi_devices for them, so we have
763 * to deal with them specially.
764 */
765 if (handle == NULL)
766 return acpi_root;
767
768 do {
769 status = acpi_get_parent(handle, &handle);
770 if (status == AE_NULL_ENTRY)
771 return NULL;
772 if (ACPI_FAILURE(status))
773 return acpi_root;
774
775 ret = acpi_bus_get_device(handle, &device);
776 if (ret == 0)
777 return device;
778 } while (1);
779 }
780
781 acpi_status
782 acpi_bus_get_ejd(acpi_handle handle, acpi_handle *ejd)
783 {
784 acpi_status status;
785 acpi_handle tmp;
786 struct acpi_buffer buffer = {ACPI_ALLOCATE_BUFFER, NULL};
787 union acpi_object *obj;
788
789 status = acpi_get_handle(handle, "_EJD", &tmp);
790 if (ACPI_FAILURE(status))
791 return status;
792
793 status = acpi_evaluate_object(handle, "_EJD", NULL, &buffer);
794 if (ACPI_SUCCESS(status)) {
795 obj = buffer.pointer;
796 status = acpi_get_handle(ACPI_ROOT_OBJECT, obj->string.pointer,
797 ejd);
798 kfree(buffer.pointer);
799 }
800 return status;
801 }
802 EXPORT_SYMBOL_GPL(acpi_bus_get_ejd);
803
804 void acpi_bus_data_handler(acpi_handle handle, void *context)
805 {
806
807 /* TBD */
808
809 return;
810 }
811
812 static int acpi_bus_get_perf_flags(struct acpi_device *device)
813 {
814 device->performance.state = ACPI_STATE_UNKNOWN;
815 return 0;
816 }
817
818 static acpi_status
819 acpi_bus_extract_wakeup_device_power_package(acpi_handle handle,
820 struct acpi_device_wakeup *wakeup)
821 {
822 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
823 union acpi_object *package = NULL;
824 union acpi_object *element = NULL;
825 acpi_status status;
826 int i = 0;
827
828 if (!wakeup)
829 return AE_BAD_PARAMETER;
830
831 /* _PRW */
832 status = acpi_evaluate_object(handle, "_PRW", NULL, &buffer);
833 if (ACPI_FAILURE(status)) {
834 ACPI_EXCEPTION((AE_INFO, status, "Evaluating _PRW"));
835 return status;
836 }
837
838 package = (union acpi_object *)buffer.pointer;
839
840 if (!package || (package->package.count < 2)) {
841 status = AE_BAD_DATA;
842 goto out;
843 }
844
845 element = &(package->package.elements[0]);
846 if (!element) {
847 status = AE_BAD_DATA;
848 goto out;
849 }
850 if (element->type == ACPI_TYPE_PACKAGE) {
851 if ((element->package.count < 2) ||
852 (element->package.elements[0].type !=
853 ACPI_TYPE_LOCAL_REFERENCE)
854 || (element->package.elements[1].type != ACPI_TYPE_INTEGER)) {
855 status = AE_BAD_DATA;
856 goto out;
857 }
858 wakeup->gpe_device =
859 element->package.elements[0].reference.handle;
860 wakeup->gpe_number =
861 (u32) element->package.elements[1].integer.value;
862 } else if (element->type == ACPI_TYPE_INTEGER) {
863 wakeup->gpe_device = NULL;
864 wakeup->gpe_number = element->integer.value;
865 } else {
866 status = AE_BAD_DATA;
867 goto out;
868 }
869
870 element = &(package->package.elements[1]);
871 if (element->type != ACPI_TYPE_INTEGER) {
872 status = AE_BAD_DATA;
873 goto out;
874 }
875 wakeup->sleep_state = element->integer.value;
876
877 if ((package->package.count - 2) > ACPI_MAX_HANDLES) {
878 status = AE_NO_MEMORY;
879 goto out;
880 }
881 wakeup->resources.count = package->package.count - 2;
882 for (i = 0; i < wakeup->resources.count; i++) {
883 element = &(package->package.elements[i + 2]);
884 if (element->type != ACPI_TYPE_LOCAL_REFERENCE) {
885 status = AE_BAD_DATA;
886 goto out;
887 }
888
889 wakeup->resources.handles[i] = element->reference.handle;
890 }
891
892 acpi_setup_gpe_for_wake(handle, wakeup->gpe_device, wakeup->gpe_number);
893
894 out:
895 kfree(buffer.pointer);
896
897 return status;
898 }
899
900 static void acpi_bus_set_run_wake_flags(struct acpi_device *device)
901 {
902 struct acpi_device_id button_device_ids[] = {
903 {"PNP0C0D", 0},
904 {"PNP0C0C", 0},
905 {"PNP0C0E", 0},
906 {"", 0},
907 };
908 acpi_status status;
909 acpi_event_status event_status;
910
911 device->wakeup.flags.notifier_present = 0;
912
913 /* Power button, Lid switch always enable wakeup */
914 if (!acpi_match_device_ids(device, button_device_ids)) {
915 device->wakeup.flags.run_wake = 1;
916 device_set_wakeup_capable(&device->dev, true);
917 return;
918 }
919
920 status = acpi_get_gpe_status(device->wakeup.gpe_device,
921 device->wakeup.gpe_number,
922 &event_status);
923 if (status == AE_OK)
924 device->wakeup.flags.run_wake =
925 !!(event_status & ACPI_EVENT_FLAG_HANDLE);
926 }
927
928 static void acpi_bus_get_wakeup_device_flags(struct acpi_device *device)
929 {
930 acpi_handle temp;
931 acpi_status status = 0;
932 int psw_error;
933
934 /* Presence of _PRW indicates wake capable */
935 status = acpi_get_handle(device->handle, "_PRW", &temp);
936 if (ACPI_FAILURE(status))
937 return;
938
939 status = acpi_bus_extract_wakeup_device_power_package(device->handle,
940 &device->wakeup);
941 if (ACPI_FAILURE(status)) {
942 ACPI_EXCEPTION((AE_INFO, status, "Extracting _PRW package"));
943 return;
944 }
945
946 device->wakeup.flags.valid = 1;
947 device->wakeup.prepare_count = 0;
948 acpi_bus_set_run_wake_flags(device);
949 /* Call _PSW/_DSW object to disable its ability to wake the sleeping
950 * system for the ACPI device with the _PRW object.
951 * The _PSW object is depreciated in ACPI 3.0 and is replaced by _DSW.
952 * So it is necessary to call _DSW object first. Only when it is not
953 * present will the _PSW object used.
954 */
955 psw_error = acpi_device_sleep_wake(device, 0, 0, 0);
956 if (psw_error)
957 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
958 "error in _DSW or _PSW evaluation\n"));
959 }
960
961 static void acpi_bus_add_power_resource(acpi_handle handle);
962
963 static int acpi_bus_get_power_flags(struct acpi_device *device)
964 {
965 acpi_status status = 0;
966 acpi_handle handle = NULL;
967 u32 i = 0;
968
969
970 /*
971 * Power Management Flags
972 */
973 status = acpi_get_handle(device->handle, "_PSC", &handle);
974 if (ACPI_SUCCESS(status))
975 device->power.flags.explicit_get = 1;
976 status = acpi_get_handle(device->handle, "_IRC", &handle);
977 if (ACPI_SUCCESS(status))
978 device->power.flags.inrush_current = 1;
979
980 /*
981 * Enumerate supported power management states
982 */
983 for (i = ACPI_STATE_D0; i <= ACPI_STATE_D3_HOT; i++) {
984 struct acpi_device_power_state *ps = &device->power.states[i];
985 char object_name[5] = { '_', 'P', 'R', '0' + i, '\0' };
986
987 /* Evaluate "_PRx" to se if power resources are referenced */
988 acpi_evaluate_reference(device->handle, object_name, NULL,
989 &ps->resources);
990 if (ps->resources.count) {
991 int j;
992
993 device->power.flags.power_resources = 1;
994 for (j = 0; j < ps->resources.count; j++)
995 acpi_bus_add_power_resource(ps->resources.handles[j]);
996 }
997
998 /* Evaluate "_PSx" to see if we can do explicit sets */
999 object_name[2] = 'S';
1000 status = acpi_get_handle(device->handle, object_name, &handle);
1001 if (ACPI_SUCCESS(status))
1002 ps->flags.explicit_set = 1;
1003
1004 /*
1005 * State is valid if there are means to put the device into it.
1006 * D3hot is only valid if _PR3 present.
1007 */
1008 if (ps->resources.count ||
1009 (ps->flags.explicit_set && i < ACPI_STATE_D3_HOT)) {
1010 ps->flags.valid = 1;
1011 ps->flags.os_accessible = 1;
1012 }
1013
1014 ps->power = -1; /* Unknown - driver assigned */
1015 ps->latency = -1; /* Unknown - driver assigned */
1016 }
1017
1018 /* Set defaults for D0 and D3 states (always valid) */
1019 device->power.states[ACPI_STATE_D0].flags.valid = 1;
1020 device->power.states[ACPI_STATE_D0].power = 100;
1021 device->power.states[ACPI_STATE_D3].flags.valid = 1;
1022 device->power.states[ACPI_STATE_D3].power = 0;
1023
1024 /* Set D3cold's explicit_set flag if _PS3 exists. */
1025 if (device->power.states[ACPI_STATE_D3_HOT].flags.explicit_set)
1026 device->power.states[ACPI_STATE_D3_COLD].flags.explicit_set = 1;
1027
1028 /* Presence of _PS3 or _PRx means we can put the device into D3 cold */
1029 if (device->power.states[ACPI_STATE_D3_HOT].flags.explicit_set ||
1030 device->power.flags.power_resources)
1031 device->power.states[ACPI_STATE_D3_COLD].flags.os_accessible = 1;
1032
1033 acpi_bus_init_power(device);
1034
1035 return 0;
1036 }
1037
1038 static int acpi_bus_get_flags(struct acpi_device *device)
1039 {
1040 acpi_status status = AE_OK;
1041 acpi_handle temp = NULL;
1042
1043
1044 /* Presence of _STA indicates 'dynamic_status' */
1045 status = acpi_get_handle(device->handle, "_STA", &temp);
1046 if (ACPI_SUCCESS(status))
1047 device->flags.dynamic_status = 1;
1048
1049 /* Presence of _RMV indicates 'removable' */
1050 status = acpi_get_handle(device->handle, "_RMV", &temp);
1051 if (ACPI_SUCCESS(status))
1052 device->flags.removable = 1;
1053
1054 /* Presence of _EJD|_EJ0 indicates 'ejectable' */
1055 status = acpi_get_handle(device->handle, "_EJD", &temp);
1056 if (ACPI_SUCCESS(status))
1057 device->flags.ejectable = 1;
1058 else {
1059 status = acpi_get_handle(device->handle, "_EJ0", &temp);
1060 if (ACPI_SUCCESS(status))
1061 device->flags.ejectable = 1;
1062 }
1063
1064 /* Presence of _LCK indicates 'lockable' */
1065 status = acpi_get_handle(device->handle, "_LCK", &temp);
1066 if (ACPI_SUCCESS(status))
1067 device->flags.lockable = 1;
1068
1069 /* Power resources cannot be power manageable. */
1070 if (device->device_type == ACPI_BUS_TYPE_POWER)
1071 return 0;
1072
1073 /* Presence of _PS0|_PR0 indicates 'power manageable' */
1074 status = acpi_get_handle(device->handle, "_PS0", &temp);
1075 if (ACPI_FAILURE(status))
1076 status = acpi_get_handle(device->handle, "_PR0", &temp);
1077 if (ACPI_SUCCESS(status))
1078 device->flags.power_manageable = 1;
1079
1080 /* TBD: Performance management */
1081
1082 return 0;
1083 }
1084
1085 static void acpi_device_get_busid(struct acpi_device *device)
1086 {
1087 char bus_id[5] = { '?', 0 };
1088 struct acpi_buffer buffer = { sizeof(bus_id), bus_id };
1089 int i = 0;
1090
1091 /*
1092 * Bus ID
1093 * ------
1094 * The device's Bus ID is simply the object name.
1095 * TBD: Shouldn't this value be unique (within the ACPI namespace)?
1096 */
1097 if (ACPI_IS_ROOT_DEVICE(device)) {
1098 strcpy(device->pnp.bus_id, "ACPI");
1099 return;
1100 }
1101
1102 switch (device->device_type) {
1103 case ACPI_BUS_TYPE_POWER_BUTTON:
1104 strcpy(device->pnp.bus_id, "PWRF");
1105 break;
1106 case ACPI_BUS_TYPE_SLEEP_BUTTON:
1107 strcpy(device->pnp.bus_id, "SLPF");
1108 break;
1109 default:
1110 acpi_get_name(device->handle, ACPI_SINGLE_NAME, &buffer);
1111 /* Clean up trailing underscores (if any) */
1112 for (i = 3; i > 1; i--) {
1113 if (bus_id[i] == '_')
1114 bus_id[i] = '\0';
1115 else
1116 break;
1117 }
1118 strcpy(device->pnp.bus_id, bus_id);
1119 break;
1120 }
1121 }
1122
1123 /*
1124 * acpi_bay_match - see if a device is an ejectable driver bay
1125 *
1126 * If an acpi object is ejectable and has one of the ACPI ATA methods defined,
1127 * then we can safely call it an ejectable drive bay
1128 */
1129 static int acpi_bay_match(struct acpi_device *device){
1130 acpi_status status;
1131 acpi_handle handle;
1132 acpi_handle tmp;
1133 acpi_handle phandle;
1134
1135 handle = device->handle;
1136
1137 status = acpi_get_handle(handle, "_EJ0", &tmp);
1138 if (ACPI_FAILURE(status))
1139 return -ENODEV;
1140
1141 if ((ACPI_SUCCESS(acpi_get_handle(handle, "_GTF", &tmp))) ||
1142 (ACPI_SUCCESS(acpi_get_handle(handle, "_GTM", &tmp))) ||
1143 (ACPI_SUCCESS(acpi_get_handle(handle, "_STM", &tmp))) ||
1144 (ACPI_SUCCESS(acpi_get_handle(handle, "_SDD", &tmp))))
1145 return 0;
1146
1147 if (acpi_get_parent(handle, &phandle))
1148 return -ENODEV;
1149
1150 if ((ACPI_SUCCESS(acpi_get_handle(phandle, "_GTF", &tmp))) ||
1151 (ACPI_SUCCESS(acpi_get_handle(phandle, "_GTM", &tmp))) ||
1152 (ACPI_SUCCESS(acpi_get_handle(phandle, "_STM", &tmp))) ||
1153 (ACPI_SUCCESS(acpi_get_handle(phandle, "_SDD", &tmp))))
1154 return 0;
1155
1156 return -ENODEV;
1157 }
1158
1159 /*
1160 * acpi_dock_match - see if a device has a _DCK method
1161 */
1162 static int acpi_dock_match(struct acpi_device *device)
1163 {
1164 acpi_handle tmp;
1165 return acpi_get_handle(device->handle, "_DCK", &tmp);
1166 }
1167
1168 const char *acpi_device_hid(struct acpi_device *device)
1169 {
1170 struct acpi_hardware_id *hid;
1171
1172 if (list_empty(&device->pnp.ids))
1173 return dummy_hid;
1174
1175 hid = list_first_entry(&device->pnp.ids, struct acpi_hardware_id, list);
1176 return hid->id;
1177 }
1178 EXPORT_SYMBOL(acpi_device_hid);
1179
1180 static void acpi_add_id(struct acpi_device *device, const char *dev_id)
1181 {
1182 struct acpi_hardware_id *id;
1183
1184 id = kmalloc(sizeof(*id), GFP_KERNEL);
1185 if (!id)
1186 return;
1187
1188 id->id = kstrdup(dev_id, GFP_KERNEL);
1189 if (!id->id) {
1190 kfree(id);
1191 return;
1192 }
1193
1194 list_add_tail(&id->list, &device->pnp.ids);
1195 }
1196
1197 /*
1198 * Old IBM workstations have a DSDT bug wherein the SMBus object
1199 * lacks the SMBUS01 HID and the methods do not have the necessary "_"
1200 * prefix. Work around this.
1201 */
1202 static int acpi_ibm_smbus_match(struct acpi_device *device)
1203 {
1204 acpi_handle h_dummy;
1205 struct acpi_buffer path = {ACPI_ALLOCATE_BUFFER, NULL};
1206 int result;
1207
1208 if (!dmi_name_in_vendors("IBM"))
1209 return -ENODEV;
1210
1211 /* Look for SMBS object */
1212 result = acpi_get_name(device->handle, ACPI_SINGLE_NAME, &path);
1213 if (result)
1214 return result;
1215
1216 if (strcmp("SMBS", path.pointer)) {
1217 result = -ENODEV;
1218 goto out;
1219 }
1220
1221 /* Does it have the necessary (but misnamed) methods? */
1222 result = -ENODEV;
1223 if (ACPI_SUCCESS(acpi_get_handle(device->handle, "SBI", &h_dummy)) &&
1224 ACPI_SUCCESS(acpi_get_handle(device->handle, "SBR", &h_dummy)) &&
1225 ACPI_SUCCESS(acpi_get_handle(device->handle, "SBW", &h_dummy)))
1226 result = 0;
1227 out:
1228 kfree(path.pointer);
1229 return result;
1230 }
1231
1232 static void acpi_device_set_id(struct acpi_device *device)
1233 {
1234 acpi_status status;
1235 struct acpi_device_info *info;
1236 struct acpica_device_id_list *cid_list;
1237 int i;
1238
1239 switch (device->device_type) {
1240 case ACPI_BUS_TYPE_DEVICE:
1241 if (ACPI_IS_ROOT_DEVICE(device)) {
1242 acpi_add_id(device, ACPI_SYSTEM_HID);
1243 break;
1244 }
1245
1246 status = acpi_get_object_info(device->handle, &info);
1247 if (ACPI_FAILURE(status)) {
1248 printk(KERN_ERR PREFIX "%s: Error reading device info\n", __func__);
1249 return;
1250 }
1251
1252 if (info->valid & ACPI_VALID_HID)
1253 acpi_add_id(device, info->hardware_id.string);
1254 if (info->valid & ACPI_VALID_CID) {
1255 cid_list = &info->compatible_id_list;
1256 for (i = 0; i < cid_list->count; i++)
1257 acpi_add_id(device, cid_list->ids[i].string);
1258 }
1259 if (info->valid & ACPI_VALID_ADR) {
1260 device->pnp.bus_address = info->address;
1261 device->flags.bus_address = 1;
1262 }
1263
1264 kfree(info);
1265
1266 /*
1267 * Some devices don't reliably have _HIDs & _CIDs, so add
1268 * synthetic HIDs to make sure drivers can find them.
1269 */
1270 if (acpi_is_video_device(device))
1271 acpi_add_id(device, ACPI_VIDEO_HID);
1272 else if (ACPI_SUCCESS(acpi_bay_match(device)))
1273 acpi_add_id(device, ACPI_BAY_HID);
1274 else if (ACPI_SUCCESS(acpi_dock_match(device)))
1275 acpi_add_id(device, ACPI_DOCK_HID);
1276 else if (!acpi_ibm_smbus_match(device))
1277 acpi_add_id(device, ACPI_SMBUS_IBM_HID);
1278 else if (!acpi_device_hid(device) &&
1279 ACPI_IS_ROOT_DEVICE(device->parent)) {
1280 acpi_add_id(device, ACPI_BUS_HID); /* \_SB, LNXSYBUS */
1281 strcpy(device->pnp.device_name, ACPI_BUS_DEVICE_NAME);
1282 strcpy(device->pnp.device_class, ACPI_BUS_CLASS);
1283 }
1284
1285 break;
1286 case ACPI_BUS_TYPE_POWER:
1287 acpi_add_id(device, ACPI_POWER_HID);
1288 break;
1289 case ACPI_BUS_TYPE_PROCESSOR:
1290 acpi_add_id(device, ACPI_PROCESSOR_OBJECT_HID);
1291 break;
1292 case ACPI_BUS_TYPE_THERMAL:
1293 acpi_add_id(device, ACPI_THERMAL_HID);
1294 break;
1295 case ACPI_BUS_TYPE_POWER_BUTTON:
1296 acpi_add_id(device, ACPI_BUTTON_HID_POWERF);
1297 break;
1298 case ACPI_BUS_TYPE_SLEEP_BUTTON:
1299 acpi_add_id(device, ACPI_BUTTON_HID_SLEEPF);
1300 break;
1301 }
1302 }
1303
1304 static int acpi_device_set_context(struct acpi_device *device)
1305 {
1306 acpi_status status;
1307
1308 /*
1309 * Context
1310 * -------
1311 * Attach this 'struct acpi_device' to the ACPI object. This makes
1312 * resolutions from handle->device very efficient. Fixed hardware
1313 * devices have no handles, so we skip them.
1314 */
1315 if (!device->handle)
1316 return 0;
1317
1318 status = acpi_attach_data(device->handle,
1319 acpi_bus_data_handler, device);
1320 if (ACPI_SUCCESS(status))
1321 return 0;
1322
1323 printk(KERN_ERR PREFIX "Error attaching device data\n");
1324 return -ENODEV;
1325 }
1326
1327 static int acpi_bus_remove(struct acpi_device *dev, int rmdevice)
1328 {
1329 if (!dev)
1330 return -EINVAL;
1331
1332 dev->removal_type = ACPI_BUS_REMOVAL_EJECT;
1333 device_release_driver(&dev->dev);
1334
1335 if (!rmdevice)
1336 return 0;
1337
1338 /*
1339 * unbind _ADR-Based Devices when hot removal
1340 */
1341 if (dev->flags.bus_address) {
1342 if ((dev->parent) && (dev->parent->ops.unbind))
1343 dev->parent->ops.unbind(dev);
1344 }
1345 acpi_device_unregister(dev, ACPI_BUS_REMOVAL_EJECT);
1346
1347 return 0;
1348 }
1349
1350 static int acpi_add_single_object(struct acpi_device **child,
1351 acpi_handle handle, int type,
1352 unsigned long long sta,
1353 struct acpi_bus_ops *ops)
1354 {
1355 int result;
1356 struct acpi_device *device;
1357 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
1358
1359 device = kzalloc(sizeof(struct acpi_device), GFP_KERNEL);
1360 if (!device) {
1361 printk(KERN_ERR PREFIX "Memory allocation error\n");
1362 return -ENOMEM;
1363 }
1364
1365 INIT_LIST_HEAD(&device->pnp.ids);
1366 device->device_type = type;
1367 device->handle = handle;
1368 device->parent = acpi_bus_get_parent(handle);
1369 device->bus_ops = *ops; /* workround for not call .start */
1370 STRUCT_TO_INT(device->status) = sta;
1371
1372 acpi_device_get_busid(device);
1373
1374 /*
1375 * Flags
1376 * -----
1377 * Note that we only look for object handles -- cannot evaluate objects
1378 * until we know the device is present and properly initialized.
1379 */
1380 result = acpi_bus_get_flags(device);
1381 if (result)
1382 goto end;
1383
1384 /*
1385 * Initialize Device
1386 * -----------------
1387 * TBD: Synch with Core's enumeration/initialization process.
1388 */
1389 acpi_device_set_id(device);
1390
1391 /*
1392 * Power Management
1393 * ----------------
1394 */
1395 if (device->flags.power_manageable) {
1396 result = acpi_bus_get_power_flags(device);
1397 if (result)
1398 goto end;
1399 }
1400
1401 /*
1402 * Wakeup device management
1403 *-----------------------
1404 */
1405 acpi_bus_get_wakeup_device_flags(device);
1406
1407 /*
1408 * Performance Management
1409 * ----------------------
1410 */
1411 if (device->flags.performance_manageable) {
1412 result = acpi_bus_get_perf_flags(device);
1413 if (result)
1414 goto end;
1415 }
1416
1417 if ((result = acpi_device_set_context(device)))
1418 goto end;
1419
1420 result = acpi_device_register(device);
1421
1422 /*
1423 * Bind _ADR-Based Devices when hot add
1424 */
1425 if (device->flags.bus_address) {
1426 if (device->parent && device->parent->ops.bind)
1427 device->parent->ops.bind(device);
1428 }
1429
1430 end:
1431 if (!result) {
1432 acpi_get_name(handle, ACPI_FULL_PATHNAME, &buffer);
1433 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
1434 "Adding %s [%s] parent %s\n", dev_name(&device->dev),
1435 (char *) buffer.pointer,
1436 device->parent ? dev_name(&device->parent->dev) :
1437 "(null)"));
1438 kfree(buffer.pointer);
1439 *child = device;
1440 } else
1441 acpi_device_release(&device->dev);
1442
1443 return result;
1444 }
1445
1446 #define ACPI_STA_DEFAULT (ACPI_STA_DEVICE_PRESENT | ACPI_STA_DEVICE_ENABLED | \
1447 ACPI_STA_DEVICE_UI | ACPI_STA_DEVICE_FUNCTIONING)
1448
1449 static void acpi_bus_add_power_resource(acpi_handle handle)
1450 {
1451 struct acpi_bus_ops ops = {
1452 .acpi_op_add = 1,
1453 .acpi_op_start = 1,
1454 };
1455 struct acpi_device *device = NULL;
1456
1457 acpi_bus_get_device(handle, &device);
1458 if (!device)
1459 acpi_add_single_object(&device, handle, ACPI_BUS_TYPE_POWER,
1460 ACPI_STA_DEFAULT, &ops);
1461 }
1462
1463 static int acpi_bus_type_and_status(acpi_handle handle, int *type,
1464 unsigned long long *sta)
1465 {
1466 acpi_status status;
1467 acpi_object_type acpi_type;
1468
1469 status = acpi_get_type(handle, &acpi_type);
1470 if (ACPI_FAILURE(status))
1471 return -ENODEV;
1472
1473 switch (acpi_type) {
1474 case ACPI_TYPE_ANY: /* for ACPI_ROOT_OBJECT */
1475 case ACPI_TYPE_DEVICE:
1476 *type = ACPI_BUS_TYPE_DEVICE;
1477 status = acpi_bus_get_status_handle(handle, sta);
1478 if (ACPI_FAILURE(status))
1479 return -ENODEV;
1480 break;
1481 case ACPI_TYPE_PROCESSOR:
1482 *type = ACPI_BUS_TYPE_PROCESSOR;
1483 status = acpi_bus_get_status_handle(handle, sta);
1484 if (ACPI_FAILURE(status))
1485 return -ENODEV;
1486 break;
1487 case ACPI_TYPE_THERMAL:
1488 *type = ACPI_BUS_TYPE_THERMAL;
1489 *sta = ACPI_STA_DEFAULT;
1490 break;
1491 case ACPI_TYPE_POWER:
1492 *type = ACPI_BUS_TYPE_POWER;
1493 *sta = ACPI_STA_DEFAULT;
1494 break;
1495 default:
1496 return -ENODEV;
1497 }
1498
1499 return 0;
1500 }
1501
1502 static acpi_status acpi_bus_check_add(acpi_handle handle, u32 lvl,
1503 void *context, void **return_value)
1504 {
1505 struct acpi_bus_ops *ops = context;
1506 int type;
1507 unsigned long long sta;
1508 struct acpi_device *device;
1509 acpi_status status;
1510 int result;
1511
1512 result = acpi_bus_type_and_status(handle, &type, &sta);
1513 if (result)
1514 return AE_OK;
1515
1516 if (!(sta & ACPI_STA_DEVICE_PRESENT) &&
1517 !(sta & ACPI_STA_DEVICE_FUNCTIONING)) {
1518 struct acpi_device_wakeup wakeup;
1519 acpi_handle temp;
1520
1521 status = acpi_get_handle(handle, "_PRW", &temp);
1522 if (ACPI_SUCCESS(status))
1523 acpi_bus_extract_wakeup_device_power_package(handle,
1524 &wakeup);
1525 return AE_CTRL_DEPTH;
1526 }
1527
1528 /*
1529 * We may already have an acpi_device from a previous enumeration. If
1530 * so, we needn't add it again, but we may still have to start it.
1531 */
1532 device = NULL;
1533 acpi_bus_get_device(handle, &device);
1534 if (ops->acpi_op_add && !device) {
1535 acpi_add_single_object(&device, handle, type, sta, ops);
1536 /* Is the device a known good platform device? */
1537 if (device
1538 && !acpi_match_device_ids(device, acpi_platform_device_ids))
1539 acpi_create_platform_device(device);
1540 }
1541
1542 if (!device)
1543 return AE_CTRL_DEPTH;
1544
1545 if (ops->acpi_op_start && !(ops->acpi_op_add)) {
1546 status = acpi_start_single_object(device);
1547 if (ACPI_FAILURE(status))
1548 return AE_CTRL_DEPTH;
1549 }
1550
1551 if (!*return_value)
1552 *return_value = device;
1553 return AE_OK;
1554 }
1555
1556 static int acpi_bus_scan(acpi_handle handle, struct acpi_bus_ops *ops,
1557 struct acpi_device **child)
1558 {
1559 acpi_status status;
1560 void *device = NULL;
1561
1562 status = acpi_bus_check_add(handle, 0, ops, &device);
1563 if (ACPI_SUCCESS(status))
1564 acpi_walk_namespace(ACPI_TYPE_ANY, handle, ACPI_UINT32_MAX,
1565 acpi_bus_check_add, NULL, ops, &device);
1566
1567 if (child)
1568 *child = device;
1569
1570 if (device)
1571 return 0;
1572 else
1573 return -ENODEV;
1574 }
1575
1576 /*
1577 * acpi_bus_add and acpi_bus_start
1578 *
1579 * scan a given ACPI tree and (probably recently hot-plugged)
1580 * create and add or starts found devices.
1581 *
1582 * If no devices were found -ENODEV is returned which does not
1583 * mean that this is a real error, there just have been no suitable
1584 * ACPI objects in the table trunk from which the kernel could create
1585 * a device and add/start an appropriate driver.
1586 */
1587
1588 int
1589 acpi_bus_add(struct acpi_device **child,
1590 struct acpi_device *parent, acpi_handle handle, int type)
1591 {
1592 struct acpi_bus_ops ops;
1593
1594 memset(&ops, 0, sizeof(ops));
1595 ops.acpi_op_add = 1;
1596
1597 return acpi_bus_scan(handle, &ops, child);
1598 }
1599 EXPORT_SYMBOL(acpi_bus_add);
1600
1601 int acpi_bus_start(struct acpi_device *device)
1602 {
1603 struct acpi_bus_ops ops;
1604 int result;
1605
1606 if (!device)
1607 return -EINVAL;
1608
1609 memset(&ops, 0, sizeof(ops));
1610 ops.acpi_op_start = 1;
1611
1612 result = acpi_bus_scan(device->handle, &ops, NULL);
1613
1614 acpi_update_all_gpes();
1615
1616 return result;
1617 }
1618 EXPORT_SYMBOL(acpi_bus_start);
1619
1620 int acpi_bus_trim(struct acpi_device *start, int rmdevice)
1621 {
1622 acpi_status status;
1623 struct acpi_device *parent, *child;
1624 acpi_handle phandle, chandle;
1625 acpi_object_type type;
1626 u32 level = 1;
1627 int err = 0;
1628
1629 parent = start;
1630 phandle = start->handle;
1631 child = chandle = NULL;
1632
1633 while ((level > 0) && parent && (!err)) {
1634 status = acpi_get_next_object(ACPI_TYPE_ANY, phandle,
1635 chandle, &chandle);
1636
1637 /*
1638 * If this scope is exhausted then move our way back up.
1639 */
1640 if (ACPI_FAILURE(status)) {
1641 level--;
1642 chandle = phandle;
1643 acpi_get_parent(phandle, &phandle);
1644 child = parent;
1645 parent = parent->parent;
1646
1647 if (level == 0)
1648 err = acpi_bus_remove(child, rmdevice);
1649 else
1650 err = acpi_bus_remove(child, 1);
1651
1652 continue;
1653 }
1654
1655 status = acpi_get_type(chandle, &type);
1656 if (ACPI_FAILURE(status)) {
1657 continue;
1658 }
1659 /*
1660 * If there is a device corresponding to chandle then
1661 * parse it (depth-first).
1662 */
1663 if (acpi_bus_get_device(chandle, &child) == 0) {
1664 level++;
1665 phandle = chandle;
1666 chandle = NULL;
1667 parent = child;
1668 }
1669 continue;
1670 }
1671 return err;
1672 }
1673 EXPORT_SYMBOL_GPL(acpi_bus_trim);
1674
1675 static int acpi_bus_scan_fixed(void)
1676 {
1677 int result = 0;
1678 struct acpi_device *device = NULL;
1679 struct acpi_bus_ops ops;
1680
1681 memset(&ops, 0, sizeof(ops));
1682 ops.acpi_op_add = 1;
1683 ops.acpi_op_start = 1;
1684
1685 /*
1686 * Enumerate all fixed-feature devices.
1687 */
1688 if ((acpi_gbl_FADT.flags & ACPI_FADT_POWER_BUTTON) == 0) {
1689 result = acpi_add_single_object(&device, NULL,
1690 ACPI_BUS_TYPE_POWER_BUTTON,
1691 ACPI_STA_DEFAULT,
1692 &ops);
1693 device_init_wakeup(&device->dev, true);
1694 }
1695
1696 if ((acpi_gbl_FADT.flags & ACPI_FADT_SLEEP_BUTTON) == 0) {
1697 result = acpi_add_single_object(&device, NULL,
1698 ACPI_BUS_TYPE_SLEEP_BUTTON,
1699 ACPI_STA_DEFAULT,
1700 &ops);
1701 }
1702
1703 return result;
1704 }
1705
1706 int __init acpi_scan_init(void)
1707 {
1708 int result;
1709 struct acpi_bus_ops ops;
1710
1711 memset(&ops, 0, sizeof(ops));
1712 ops.acpi_op_add = 1;
1713 ops.acpi_op_start = 1;
1714
1715 result = bus_register(&acpi_bus_type);
1716 if (result) {
1717 /* We don't want to quit even if we failed to add suspend/resume */
1718 printk(KERN_ERR PREFIX "Could not register bus type\n");
1719 }
1720
1721 acpi_power_init();
1722
1723 /*
1724 * Enumerate devices in the ACPI namespace.
1725 */
1726 result = acpi_bus_scan(ACPI_ROOT_OBJECT, &ops, &acpi_root);
1727
1728 if (!result)
1729 result = acpi_bus_scan_fixed();
1730
1731 if (result)
1732 acpi_device_unregister(acpi_root, ACPI_BUS_REMOVAL_NORMAL);
1733 else
1734 acpi_update_all_gpes();
1735
1736 return result;
1737 }
Linux kernel - Deliverables
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