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disable some mediatekl custom warnings
[GitHub/mt8127/android_kernel_alcatel_ttab.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 static LIST_HEAD(acpi_device_list);
33 static LIST_HEAD(acpi_bus_id_list);
34 static DEFINE_MUTEX(acpi_scan_lock);
35 static LIST_HEAD(acpi_scan_handlers_list);
36 DEFINE_MUTEX(acpi_device_lock);
37 LIST_HEAD(acpi_wakeup_device_list);
38
39 struct acpi_device_bus_id{
40 char bus_id[15];
41 unsigned int instance_no;
42 struct list_head node;
43 };
44
45 void acpi_scan_lock_acquire(void)
46 {
47 mutex_lock(&acpi_scan_lock);
48 }
49 EXPORT_SYMBOL_GPL(acpi_scan_lock_acquire);
50
51 void acpi_scan_lock_release(void)
52 {
53 mutex_unlock(&acpi_scan_lock);
54 }
55 EXPORT_SYMBOL_GPL(acpi_scan_lock_release);
56
57 int acpi_scan_add_handler(struct acpi_scan_handler *handler)
58 {
59 if (!handler || !handler->attach)
60 return -EINVAL;
61
62 list_add_tail(&handler->list_node, &acpi_scan_handlers_list);
63 return 0;
64 }
65
66 int acpi_scan_add_handler_with_hotplug(struct acpi_scan_handler *handler,
67 const char *hotplug_profile_name)
68 {
69 int error;
70
71 error = acpi_scan_add_handler(handler);
72 if (error)
73 return error;
74
75 acpi_sysfs_add_hotplug_profile(&handler->hotplug, hotplug_profile_name);
76 return 0;
77 }
78
79 /*
80 * Creates hid/cid(s) string needed for modalias and uevent
81 * e.g. on a device with hid:IBM0001 and cid:ACPI0001 you get:
82 * char *modalias: "acpi:IBM0001:ACPI0001"
83 */
84 static int create_modalias(struct acpi_device *acpi_dev, char *modalias,
85 int size)
86 {
87 int len;
88 int count;
89 struct acpi_hardware_id *id;
90
91 if (list_empty(&acpi_dev->pnp.ids))
92 return 0;
93
94 len = snprintf(modalias, size, "acpi:");
95 size -= len;
96
97 list_for_each_entry(id, &acpi_dev->pnp.ids, list) {
98 count = snprintf(&modalias[len], size, "%s:", id->id);
99 if (count < 0 || count >= size)
100 return -EINVAL;
101 len += count;
102 size -= count;
103 }
104
105 modalias[len] = '\0';
106 return len;
107 }
108
109 static ssize_t
110 acpi_device_modalias_show(struct device *dev, struct device_attribute *attr, char *buf) {
111 struct acpi_device *acpi_dev = to_acpi_device(dev);
112 int len;
113
114 /* Device has no HID and no CID or string is >1024 */
115 len = create_modalias(acpi_dev, buf, 1024);
116 if (len <= 0)
117 return 0;
118 buf[len++] = '\n';
119 return len;
120 }
121 static DEVICE_ATTR(modalias, 0444, acpi_device_modalias_show, NULL);
122
123 static int acpi_scan_hot_remove(struct acpi_device *device)
124 {
125 acpi_handle handle = device->handle;
126 acpi_handle not_used;
127 struct acpi_object_list arg_list;
128 union acpi_object arg;
129 acpi_status status;
130 unsigned long long sta;
131
132 /* If there is no handle, the device node has been unregistered. */
133 if (!handle) {
134 dev_dbg(&device->dev, "ACPI handle missing\n");
135 put_device(&device->dev);
136 return -EINVAL;
137 }
138
139 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
140 "Hot-removing device %s...\n", dev_name(&device->dev)));
141
142 acpi_bus_trim(device);
143 /* Device node has been unregistered. */
144 put_device(&device->dev);
145 device = NULL;
146
147 if (ACPI_SUCCESS(acpi_get_handle(handle, "_LCK", &not_used))) {
148 arg_list.count = 1;
149 arg_list.pointer = &arg;
150 arg.type = ACPI_TYPE_INTEGER;
151 arg.integer.value = 0;
152 acpi_evaluate_object(handle, "_LCK", &arg_list, NULL);
153 }
154
155 arg_list.count = 1;
156 arg_list.pointer = &arg;
157 arg.type = ACPI_TYPE_INTEGER;
158 arg.integer.value = 1;
159
160 /*
161 * TBD: _EJD support.
162 */
163 status = acpi_evaluate_object(handle, "_EJ0", &arg_list, NULL);
164 if (ACPI_FAILURE(status)) {
165 if (status == AE_NOT_FOUND) {
166 return -ENODEV;
167 } else {
168 acpi_handle_warn(handle, "Eject failed (0x%x)\n",
169 status);
170 return -EIO;
171 }
172 }
173
174 /*
175 * Verify if eject was indeed successful. If not, log an error
176 * message. No need to call _OST since _EJ0 call was made OK.
177 */
178 status = acpi_evaluate_integer(handle, "_STA", NULL, &sta);
179 if (ACPI_FAILURE(status)) {
180 acpi_handle_warn(handle,
181 "Status check after eject failed (0x%x)\n", status);
182 } else if (sta & ACPI_STA_DEVICE_ENABLED) {
183 acpi_handle_warn(handle,
184 "Eject incomplete - status 0x%llx\n", sta);
185 }
186
187 return 0;
188 }
189
190 static void acpi_bus_device_eject(void *context)
191 {
192 acpi_handle handle = context;
193 struct acpi_device *device = NULL;
194 struct acpi_scan_handler *handler;
195 u32 ost_code = ACPI_OST_SC_NON_SPECIFIC_FAILURE;
196
197 mutex_lock(&acpi_scan_lock);
198
199 acpi_bus_get_device(handle, &device);
200 if (!device)
201 goto err_out;
202
203 handler = device->handler;
204 if (!handler || !handler->hotplug.enabled) {
205 ost_code = ACPI_OST_SC_EJECT_NOT_SUPPORTED;
206 goto err_out;
207 }
208 acpi_evaluate_hotplug_ost(handle, ACPI_NOTIFY_EJECT_REQUEST,
209 ACPI_OST_SC_EJECT_IN_PROGRESS, NULL);
210 if (handler->hotplug.mode == AHM_CONTAINER) {
211 device->flags.eject_pending = true;
212 kobject_uevent(&device->dev.kobj, KOBJ_OFFLINE);
213 } else {
214 int error;
215
216 get_device(&device->dev);
217 error = acpi_scan_hot_remove(device);
218 if (error)
219 goto err_out;
220 }
221
222 out:
223 mutex_unlock(&acpi_scan_lock);
224 return;
225
226 err_out:
227 acpi_evaluate_hotplug_ost(handle, ACPI_NOTIFY_EJECT_REQUEST, ost_code,
228 NULL);
229 goto out;
230 }
231
232 static void acpi_scan_bus_device_check(acpi_handle handle, u32 ost_source)
233 {
234 struct acpi_device *device = NULL;
235 u32 ost_code = ACPI_OST_SC_NON_SPECIFIC_FAILURE;
236 int error;
237
238 mutex_lock(&acpi_scan_lock);
239
240 if (ost_source != ACPI_NOTIFY_BUS_CHECK) {
241 acpi_bus_get_device(handle, &device);
242 if (device) {
243 dev_warn(&device->dev, "Attempt to re-insert\n");
244 goto out;
245 }
246 }
247 error = acpi_bus_scan(handle);
248 if (error) {
249 acpi_handle_warn(handle, "Namespace scan failure\n");
250 goto out;
251 }
252 error = acpi_bus_get_device(handle, &device);
253 if (error) {
254 acpi_handle_warn(handle, "Missing device node object\n");
255 goto out;
256 }
257 ost_code = ACPI_OST_SC_SUCCESS;
258 if (device->handler && device->handler->hotplug.mode == AHM_CONTAINER)
259 kobject_uevent(&device->dev.kobj, KOBJ_ONLINE);
260
261 out:
262 acpi_evaluate_hotplug_ost(handle, ost_source, ost_code, NULL);
263 mutex_unlock(&acpi_scan_lock);
264 }
265
266 static void acpi_scan_bus_check(void *context)
267 {
268 acpi_scan_bus_device_check((acpi_handle)context,
269 ACPI_NOTIFY_BUS_CHECK);
270 }
271
272 static void acpi_scan_device_check(void *context)
273 {
274 acpi_scan_bus_device_check((acpi_handle)context,
275 ACPI_NOTIFY_DEVICE_CHECK);
276 }
277
278 static void acpi_hotplug_unsupported(acpi_handle handle, u32 type)
279 {
280 u32 ost_status;
281
282 switch (type) {
283 case ACPI_NOTIFY_BUS_CHECK:
284 acpi_handle_debug(handle,
285 "ACPI_NOTIFY_BUS_CHECK event: unsupported\n");
286 ost_status = ACPI_OST_SC_INSERT_NOT_SUPPORTED;
287 break;
288 case ACPI_NOTIFY_DEVICE_CHECK:
289 acpi_handle_debug(handle,
290 "ACPI_NOTIFY_DEVICE_CHECK event: unsupported\n");
291 ost_status = ACPI_OST_SC_INSERT_NOT_SUPPORTED;
292 break;
293 case ACPI_NOTIFY_EJECT_REQUEST:
294 acpi_handle_debug(handle,
295 "ACPI_NOTIFY_EJECT_REQUEST event: unsupported\n");
296 ost_status = ACPI_OST_SC_EJECT_NOT_SUPPORTED;
297 break;
298 default:
299 /* non-hotplug event; possibly handled by other handler */
300 return;
301 }
302
303 acpi_evaluate_hotplug_ost(handle, type, ost_status, NULL);
304 }
305
306 static void acpi_hotplug_notify_cb(acpi_handle handle, u32 type, void *data)
307 {
308 acpi_osd_exec_callback callback;
309 struct acpi_scan_handler *handler = data;
310 acpi_status status;
311
312 if (!handler->hotplug.enabled)
313 return acpi_hotplug_unsupported(handle, type);
314
315 switch (type) {
316 case ACPI_NOTIFY_BUS_CHECK:
317 acpi_handle_debug(handle, "ACPI_NOTIFY_BUS_CHECK event\n");
318 callback = acpi_scan_bus_check;
319 break;
320 case ACPI_NOTIFY_DEVICE_CHECK:
321 acpi_handle_debug(handle, "ACPI_NOTIFY_DEVICE_CHECK event\n");
322 callback = acpi_scan_device_check;
323 break;
324 case ACPI_NOTIFY_EJECT_REQUEST:
325 acpi_handle_debug(handle, "ACPI_NOTIFY_EJECT_REQUEST event\n");
326 callback = acpi_bus_device_eject;
327 break;
328 default:
329 /* non-hotplug event; possibly handled by other handler */
330 return;
331 }
332 status = acpi_os_hotplug_execute(callback, handle);
333 if (ACPI_FAILURE(status))
334 acpi_evaluate_hotplug_ost(handle, type,
335 ACPI_OST_SC_NON_SPECIFIC_FAILURE,
336 NULL);
337 }
338
339 /**
340 * acpi_bus_hot_remove_device: hot-remove a device and its children
341 * @context: struct acpi_eject_event pointer (freed in this func)
342 *
343 * Hot-remove a device and its children. This function frees up the
344 * memory space passed by arg context, so that the caller may call
345 * this function asynchronously through acpi_os_hotplug_execute().
346 */
347 void acpi_bus_hot_remove_device(void *context)
348 {
349 struct acpi_eject_event *ej_event = context;
350 struct acpi_device *device = ej_event->device;
351 acpi_handle handle = device->handle;
352 int error;
353
354 mutex_lock(&acpi_scan_lock);
355
356 error = acpi_scan_hot_remove(device);
357 if (error && handle)
358 acpi_evaluate_hotplug_ost(handle, ej_event->event,
359 ACPI_OST_SC_NON_SPECIFIC_FAILURE,
360 NULL);
361
362 mutex_unlock(&acpi_scan_lock);
363 kfree(context);
364 }
365 EXPORT_SYMBOL(acpi_bus_hot_remove_device);
366
367 static ssize_t real_power_state_show(struct device *dev,
368 struct device_attribute *attr, char *buf)
369 {
370 struct acpi_device *adev = to_acpi_device(dev);
371 int state;
372 int ret;
373
374 ret = acpi_device_get_power(adev, &state);
375 if (ret)
376 return ret;
377
378 return sprintf(buf, "%s\n", acpi_power_state_string(state));
379 }
380
381 static DEVICE_ATTR(real_power_state, 0444, real_power_state_show, NULL);
382
383 static ssize_t power_state_show(struct device *dev,
384 struct device_attribute *attr, char *buf)
385 {
386 struct acpi_device *adev = to_acpi_device(dev);
387
388 return sprintf(buf, "%s\n", acpi_power_state_string(adev->power.state));
389 }
390
391 static DEVICE_ATTR(power_state, 0444, power_state_show, NULL);
392
393 static ssize_t
394 acpi_eject_store(struct device *d, struct device_attribute *attr,
395 const char *buf, size_t count)
396 {
397 struct acpi_device *acpi_device = to_acpi_device(d);
398 struct acpi_eject_event *ej_event;
399 acpi_object_type not_used;
400 acpi_status status;
401 u32 ost_source;
402 int ret;
403
404 if (!count || buf[0] != '1')
405 return -EINVAL;
406
407 if ((!acpi_device->handler || !acpi_device->handler->hotplug.enabled)
408 && !acpi_device->driver)
409 return -ENODEV;
410
411 status = acpi_get_type(acpi_device->handle, &not_used);
412 if (ACPI_FAILURE(status) || !acpi_device->flags.ejectable)
413 return -ENODEV;
414
415 mutex_lock(&acpi_scan_lock);
416
417 if (acpi_device->flags.eject_pending) {
418 /* ACPI eject notification event. */
419 ost_source = ACPI_NOTIFY_EJECT_REQUEST;
420 acpi_device->flags.eject_pending = 0;
421 } else {
422 /* Eject initiated by user space. */
423 ost_source = ACPI_OST_EC_OSPM_EJECT;
424 }
425 ej_event = kmalloc(sizeof(*ej_event), GFP_KERNEL);
426 if (!ej_event) {
427 ret = -ENOMEM;
428 goto err_out;
429 }
430 acpi_evaluate_hotplug_ost(acpi_device->handle, ost_source,
431 ACPI_OST_SC_EJECT_IN_PROGRESS, NULL);
432 ej_event->device = acpi_device;
433 ej_event->event = ost_source;
434 get_device(&acpi_device->dev);
435 status = acpi_os_hotplug_execute(acpi_bus_hot_remove_device, ej_event);
436 if (ACPI_FAILURE(status)) {
437 put_device(&acpi_device->dev);
438 kfree(ej_event);
439 ret = status == AE_NO_MEMORY ? -ENOMEM : -EAGAIN;
440 goto err_out;
441 }
442 ret = count;
443
444 out:
445 mutex_unlock(&acpi_scan_lock);
446 return ret;
447
448 err_out:
449 acpi_evaluate_hotplug_ost(acpi_device->handle, ost_source,
450 ACPI_OST_SC_NON_SPECIFIC_FAILURE, NULL);
451 goto out;
452 }
453
454 static DEVICE_ATTR(eject, 0200, NULL, acpi_eject_store);
455
456 static ssize_t
457 acpi_device_hid_show(struct device *dev, struct device_attribute *attr, char *buf) {
458 struct acpi_device *acpi_dev = to_acpi_device(dev);
459
460 return sprintf(buf, "%s\n", acpi_device_hid(acpi_dev));
461 }
462 static DEVICE_ATTR(hid, 0444, acpi_device_hid_show, NULL);
463
464 static ssize_t acpi_device_uid_show(struct device *dev,
465 struct device_attribute *attr, char *buf)
466 {
467 struct acpi_device *acpi_dev = to_acpi_device(dev);
468
469 return sprintf(buf, "%s\n", acpi_dev->pnp.unique_id);
470 }
471 static DEVICE_ATTR(uid, 0444, acpi_device_uid_show, NULL);
472
473 static ssize_t acpi_device_adr_show(struct device *dev,
474 struct device_attribute *attr, char *buf)
475 {
476 struct acpi_device *acpi_dev = to_acpi_device(dev);
477
478 return sprintf(buf, "0x%08x\n",
479 (unsigned int)(acpi_dev->pnp.bus_address));
480 }
481 static DEVICE_ATTR(adr, 0444, acpi_device_adr_show, NULL);
482
483 static ssize_t
484 acpi_device_path_show(struct device *dev, struct device_attribute *attr, char *buf) {
485 struct acpi_device *acpi_dev = to_acpi_device(dev);
486 struct acpi_buffer path = {ACPI_ALLOCATE_BUFFER, NULL};
487 int result;
488
489 result = acpi_get_name(acpi_dev->handle, ACPI_FULL_PATHNAME, &path);
490 if (result)
491 goto end;
492
493 result = sprintf(buf, "%s\n", (char*)path.pointer);
494 kfree(path.pointer);
495 end:
496 return result;
497 }
498 static DEVICE_ATTR(path, 0444, acpi_device_path_show, NULL);
499
500 /* sysfs file that shows description text from the ACPI _STR method */
501 static ssize_t description_show(struct device *dev,
502 struct device_attribute *attr,
503 char *buf) {
504 struct acpi_device *acpi_dev = to_acpi_device(dev);
505 int result;
506
507 if (acpi_dev->pnp.str_obj == NULL)
508 return 0;
509
510 /*
511 * The _STR object contains a Unicode identifier for a device.
512 * We need to convert to utf-8 so it can be displayed.
513 */
514 result = utf16s_to_utf8s(
515 (wchar_t *)acpi_dev->pnp.str_obj->buffer.pointer,
516 acpi_dev->pnp.str_obj->buffer.length,
517 UTF16_LITTLE_ENDIAN, buf,
518 PAGE_SIZE);
519
520 buf[result++] = '\n';
521
522 return result;
523 }
524 static DEVICE_ATTR(description, 0444, description_show, NULL);
525
526 static ssize_t
527 acpi_device_sun_show(struct device *dev, struct device_attribute *attr,
528 char *buf) {
529 struct acpi_device *acpi_dev = to_acpi_device(dev);
530
531 return sprintf(buf, "%lu\n", acpi_dev->pnp.sun);
532 }
533 static DEVICE_ATTR(sun, 0444, acpi_device_sun_show, NULL);
534
535 static int acpi_device_setup_files(struct acpi_device *dev)
536 {
537 struct acpi_buffer buffer = {ACPI_ALLOCATE_BUFFER, NULL};
538 acpi_status status;
539 acpi_handle temp;
540 unsigned long long sun;
541 int result = 0;
542
543 /*
544 * Devices gotten from FADT don't have a "path" attribute
545 */
546 if (dev->handle) {
547 result = device_create_file(&dev->dev, &dev_attr_path);
548 if (result)
549 goto end;
550 }
551
552 if (!list_empty(&dev->pnp.ids)) {
553 result = device_create_file(&dev->dev, &dev_attr_hid);
554 if (result)
555 goto end;
556
557 result = device_create_file(&dev->dev, &dev_attr_modalias);
558 if (result)
559 goto end;
560 }
561
562 /*
563 * If device has _STR, 'description' file is created
564 */
565 status = acpi_get_handle(dev->handle, "_STR", &temp);
566 if (ACPI_SUCCESS(status)) {
567 status = acpi_evaluate_object(dev->handle, "_STR",
568 NULL, &buffer);
569 if (ACPI_FAILURE(status))
570 buffer.pointer = NULL;
571 dev->pnp.str_obj = buffer.pointer;
572 result = device_create_file(&dev->dev, &dev_attr_description);
573 if (result)
574 goto end;
575 }
576
577 if (dev->pnp.type.bus_address)
578 result = device_create_file(&dev->dev, &dev_attr_adr);
579 if (dev->pnp.unique_id)
580 result = device_create_file(&dev->dev, &dev_attr_uid);
581
582 status = acpi_evaluate_integer(dev->handle, "_SUN", NULL, &sun);
583 if (ACPI_SUCCESS(status)) {
584 dev->pnp.sun = (unsigned long)sun;
585 result = device_create_file(&dev->dev, &dev_attr_sun);
586 if (result)
587 goto end;
588 } else {
589 dev->pnp.sun = (unsigned long)-1;
590 }
591
592 /*
593 * If device has _EJ0, 'eject' file is created that is used to trigger
594 * hot-removal function from userland.
595 */
596 status = acpi_get_handle(dev->handle, "_EJ0", &temp);
597 if (ACPI_SUCCESS(status)) {
598 result = device_create_file(&dev->dev, &dev_attr_eject);
599 if (result)
600 return result;
601 }
602
603 if (dev->flags.power_manageable) {
604 result = device_create_file(&dev->dev, &dev_attr_power_state);
605 if (result)
606 return result;
607
608 if (dev->power.flags.power_resources)
609 result = device_create_file(&dev->dev,
610 &dev_attr_real_power_state);
611 }
612
613 end:
614 return result;
615 }
616
617 static void acpi_device_remove_files(struct acpi_device *dev)
618 {
619 acpi_status status;
620 acpi_handle temp;
621
622 if (dev->flags.power_manageable) {
623 device_remove_file(&dev->dev, &dev_attr_power_state);
624 if (dev->power.flags.power_resources)
625 device_remove_file(&dev->dev,
626 &dev_attr_real_power_state);
627 }
628
629 /*
630 * If device has _STR, remove 'description' file
631 */
632 status = acpi_get_handle(dev->handle, "_STR", &temp);
633 if (ACPI_SUCCESS(status)) {
634 kfree(dev->pnp.str_obj);
635 device_remove_file(&dev->dev, &dev_attr_description);
636 }
637 /*
638 * If device has _EJ0, remove 'eject' file.
639 */
640 status = acpi_get_handle(dev->handle, "_EJ0", &temp);
641 if (ACPI_SUCCESS(status))
642 device_remove_file(&dev->dev, &dev_attr_eject);
643
644 status = acpi_get_handle(dev->handle, "_SUN", &temp);
645 if (ACPI_SUCCESS(status))
646 device_remove_file(&dev->dev, &dev_attr_sun);
647
648 if (dev->pnp.unique_id)
649 device_remove_file(&dev->dev, &dev_attr_uid);
650 if (dev->pnp.type.bus_address)
651 device_remove_file(&dev->dev, &dev_attr_adr);
652 device_remove_file(&dev->dev, &dev_attr_modalias);
653 device_remove_file(&dev->dev, &dev_attr_hid);
654 if (dev->handle)
655 device_remove_file(&dev->dev, &dev_attr_path);
656 }
657 /* --------------------------------------------------------------------------
658 ACPI Bus operations
659 -------------------------------------------------------------------------- */
660
661 static const struct acpi_device_id *__acpi_match_device(
662 struct acpi_device *device, const struct acpi_device_id *ids)
663 {
664 const struct acpi_device_id *id;
665 struct acpi_hardware_id *hwid;
666
667 /*
668 * If the device is not present, it is unnecessary to load device
669 * driver for it.
670 */
671 if (!device->status.present)
672 return NULL;
673
674 for (id = ids; id->id[0]; id++)
675 list_for_each_entry(hwid, &device->pnp.ids, list)
676 if (!strcmp((char *) id->id, hwid->id))
677 return id;
678
679 return NULL;
680 }
681
682 /**
683 * acpi_match_device - Match a struct device against a given list of ACPI IDs
684 * @ids: Array of struct acpi_device_id object to match against.
685 * @dev: The device structure to match.
686 *
687 * Check if @dev has a valid ACPI handle and if there is a struct acpi_device
688 * object for that handle and use that object to match against a given list of
689 * device IDs.
690 *
691 * Return a pointer to the first matching ID on success or %NULL on failure.
692 */
693 const struct acpi_device_id *acpi_match_device(const struct acpi_device_id *ids,
694 const struct device *dev)
695 {
696 struct acpi_device *adev;
697 acpi_handle handle = ACPI_HANDLE(dev);
698
699 if (!ids || !handle || acpi_bus_get_device(handle, &adev))
700 return NULL;
701
702 return __acpi_match_device(adev, ids);
703 }
704 EXPORT_SYMBOL_GPL(acpi_match_device);
705
706 int acpi_match_device_ids(struct acpi_device *device,
707 const struct acpi_device_id *ids)
708 {
709 return __acpi_match_device(device, ids) ? 0 : -ENOENT;
710 }
711 EXPORT_SYMBOL(acpi_match_device_ids);
712
713 static void acpi_free_power_resources_lists(struct acpi_device *device)
714 {
715 int i;
716
717 if (device->wakeup.flags.valid)
718 acpi_power_resources_list_free(&device->wakeup.resources);
719
720 if (!device->flags.power_manageable)
721 return;
722
723 for (i = ACPI_STATE_D0; i <= ACPI_STATE_D3_HOT; i++) {
724 struct acpi_device_power_state *ps = &device->power.states[i];
725 acpi_power_resources_list_free(&ps->resources);
726 }
727 }
728
729 static void acpi_device_release(struct device *dev)
730 {
731 struct acpi_device *acpi_dev = to_acpi_device(dev);
732
733 acpi_free_pnp_ids(&acpi_dev->pnp);
734 acpi_free_power_resources_lists(acpi_dev);
735 kfree(acpi_dev);
736 }
737
738 static int acpi_bus_match(struct device *dev, struct device_driver *drv)
739 {
740 struct acpi_device *acpi_dev = to_acpi_device(dev);
741 struct acpi_driver *acpi_drv = to_acpi_driver(drv);
742
743 return acpi_dev->flags.match_driver
744 && !acpi_match_device_ids(acpi_dev, acpi_drv->ids);
745 }
746
747 static int acpi_device_uevent(struct device *dev, struct kobj_uevent_env *env)
748 {
749 struct acpi_device *acpi_dev = to_acpi_device(dev);
750 int len;
751
752 if (list_empty(&acpi_dev->pnp.ids))
753 return 0;
754
755 if (add_uevent_var(env, "MODALIAS="))
756 return -ENOMEM;
757 len = create_modalias(acpi_dev, &env->buf[env->buflen - 1],
758 sizeof(env->buf) - env->buflen);
759 if (len >= (sizeof(env->buf) - env->buflen))
760 return -ENOMEM;
761 env->buflen += len;
762 return 0;
763 }
764
765 static void acpi_device_notify(acpi_handle handle, u32 event, void *data)
766 {
767 struct acpi_device *device = data;
768
769 device->driver->ops.notify(device, event);
770 }
771
772 static acpi_status acpi_device_notify_fixed(void *data)
773 {
774 struct acpi_device *device = data;
775
776 /* Fixed hardware devices have no handles */
777 acpi_device_notify(NULL, ACPI_FIXED_HARDWARE_EVENT, device);
778 return AE_OK;
779 }
780
781 static int acpi_device_install_notify_handler(struct acpi_device *device)
782 {
783 acpi_status status;
784
785 if (device->device_type == ACPI_BUS_TYPE_POWER_BUTTON)
786 status =
787 acpi_install_fixed_event_handler(ACPI_EVENT_POWER_BUTTON,
788 acpi_device_notify_fixed,
789 device);
790 else if (device->device_type == ACPI_BUS_TYPE_SLEEP_BUTTON)
791 status =
792 acpi_install_fixed_event_handler(ACPI_EVENT_SLEEP_BUTTON,
793 acpi_device_notify_fixed,
794 device);
795 else
796 status = acpi_install_notify_handler(device->handle,
797 ACPI_DEVICE_NOTIFY,
798 acpi_device_notify,
799 device);
800
801 if (ACPI_FAILURE(status))
802 return -EINVAL;
803 return 0;
804 }
805
806 static void acpi_device_remove_notify_handler(struct acpi_device *device)
807 {
808 if (device->device_type == ACPI_BUS_TYPE_POWER_BUTTON)
809 acpi_remove_fixed_event_handler(ACPI_EVENT_POWER_BUTTON,
810 acpi_device_notify_fixed);
811 else if (device->device_type == ACPI_BUS_TYPE_SLEEP_BUTTON)
812 acpi_remove_fixed_event_handler(ACPI_EVENT_SLEEP_BUTTON,
813 acpi_device_notify_fixed);
814 else
815 acpi_remove_notify_handler(device->handle, ACPI_DEVICE_NOTIFY,
816 acpi_device_notify);
817 }
818
819 static int acpi_bus_driver_init(struct acpi_device *, struct acpi_driver *);
820 static int acpi_device_probe(struct device * dev)
821 {
822 struct acpi_device *acpi_dev = to_acpi_device(dev);
823 struct acpi_driver *acpi_drv = to_acpi_driver(dev->driver);
824 int ret;
825
826 ret = acpi_bus_driver_init(acpi_dev, acpi_drv);
827 if (!ret) {
828 if (acpi_drv->ops.notify) {
829 ret = acpi_device_install_notify_handler(acpi_dev);
830 if (ret) {
831 if (acpi_drv->ops.remove)
832 acpi_drv->ops.remove(acpi_dev);
833 acpi_dev->driver = NULL;
834 acpi_dev->driver_data = NULL;
835 return ret;
836 }
837 }
838
839 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
840 "Found driver [%s] for device [%s]\n",
841 acpi_drv->name, acpi_dev->pnp.bus_id));
842 get_device(dev);
843 }
844 return ret;
845 }
846
847 static int acpi_device_remove(struct device * dev)
848 {
849 struct acpi_device *acpi_dev = to_acpi_device(dev);
850 struct acpi_driver *acpi_drv = acpi_dev->driver;
851
852 if (acpi_drv) {
853 if (acpi_drv->ops.notify)
854 acpi_device_remove_notify_handler(acpi_dev);
855 if (acpi_drv->ops.remove)
856 acpi_drv->ops.remove(acpi_dev);
857 }
858 acpi_dev->driver = NULL;
859 acpi_dev->driver_data = NULL;
860
861 put_device(dev);
862 return 0;
863 }
864
865 struct bus_type acpi_bus_type = {
866 .name = "acpi",
867 .match = acpi_bus_match,
868 .probe = acpi_device_probe,
869 .remove = acpi_device_remove,
870 .uevent = acpi_device_uevent,
871 };
872
873 int acpi_device_add(struct acpi_device *device,
874 void (*release)(struct device *))
875 {
876 int result;
877 struct acpi_device_bus_id *acpi_device_bus_id, *new_bus_id;
878 int found = 0;
879
880 if (device->handle) {
881 acpi_status status;
882
883 status = acpi_attach_data(device->handle, acpi_bus_data_handler,
884 device);
885 if (ACPI_FAILURE(status)) {
886 acpi_handle_err(device->handle,
887 "Unable to attach device data\n");
888 return -ENODEV;
889 }
890 }
891
892 /*
893 * Linkage
894 * -------
895 * Link this device to its parent and siblings.
896 */
897 INIT_LIST_HEAD(&device->children);
898 INIT_LIST_HEAD(&device->node);
899 INIT_LIST_HEAD(&device->wakeup_list);
900 INIT_LIST_HEAD(&device->physical_node_list);
901 mutex_init(&device->physical_node_lock);
902 INIT_LIST_HEAD(&device->power_dependent);
903
904 new_bus_id = kzalloc(sizeof(struct acpi_device_bus_id), GFP_KERNEL);
905 if (!new_bus_id) {
906 pr_err(PREFIX "Memory allocation error\n");
907 result = -ENOMEM;
908 goto err_detach;
909 }
910
911 mutex_lock(&acpi_device_lock);
912 /*
913 * Find suitable bus_id and instance number in acpi_bus_id_list
914 * If failed, create one and link it into acpi_bus_id_list
915 */
916 list_for_each_entry(acpi_device_bus_id, &acpi_bus_id_list, node) {
917 if (!strcmp(acpi_device_bus_id->bus_id,
918 acpi_device_hid(device))) {
919 acpi_device_bus_id->instance_no++;
920 found = 1;
921 kfree(new_bus_id);
922 break;
923 }
924 }
925 if (!found) {
926 acpi_device_bus_id = new_bus_id;
927 strcpy(acpi_device_bus_id->bus_id, acpi_device_hid(device));
928 acpi_device_bus_id->instance_no = 0;
929 list_add_tail(&acpi_device_bus_id->node, &acpi_bus_id_list);
930 }
931 dev_set_name(&device->dev, "%s:%02x", acpi_device_bus_id->bus_id, acpi_device_bus_id->instance_no);
932
933 if (device->parent)
934 list_add_tail(&device->node, &device->parent->children);
935
936 if (device->wakeup.flags.valid)
937 list_add_tail(&device->wakeup_list, &acpi_wakeup_device_list);
938 mutex_unlock(&acpi_device_lock);
939
940 if (device->parent)
941 device->dev.parent = &device->parent->dev;
942 device->dev.bus = &acpi_bus_type;
943 device->dev.release = release;
944 result = device_add(&device->dev);
945 if (result) {
946 dev_err(&device->dev, "Error registering device\n");
947 goto err;
948 }
949
950 result = acpi_device_setup_files(device);
951 if (result)
952 printk(KERN_ERR PREFIX "Error creating sysfs interface for device %s\n",
953 dev_name(&device->dev));
954
955 device->removal_type = ACPI_BUS_REMOVAL_NORMAL;
956 return 0;
957
958 err:
959 mutex_lock(&acpi_device_lock);
960 if (device->parent)
961 list_del(&device->node);
962 list_del(&device->wakeup_list);
963 mutex_unlock(&acpi_device_lock);
964
965 err_detach:
966 acpi_detach_data(device->handle, acpi_bus_data_handler);
967 return result;
968 }
969
970 static void acpi_device_unregister(struct acpi_device *device)
971 {
972 mutex_lock(&acpi_device_lock);
973 if (device->parent)
974 list_del(&device->node);
975
976 list_del(&device->wakeup_list);
977 mutex_unlock(&acpi_device_lock);
978
979 acpi_detach_data(device->handle, acpi_bus_data_handler);
980
981 acpi_power_add_remove_device(device, false);
982 acpi_device_remove_files(device);
983 if (device->remove)
984 device->remove(device);
985
986 device_del(&device->dev);
987 /*
988 * Transition the device to D3cold to drop the reference counts of all
989 * power resources the device depends on and turn off the ones that have
990 * no more references.
991 */
992 acpi_device_set_power(device, ACPI_STATE_D3_COLD);
993 device->handle = NULL;
994 put_device(&device->dev);
995 }
996
997 /* --------------------------------------------------------------------------
998 Driver Management
999 -------------------------------------------------------------------------- */
1000 /**
1001 * acpi_bus_driver_init - add a device to a driver
1002 * @device: the device to add and initialize
1003 * @driver: driver for the device
1004 *
1005 * Used to initialize a device via its device driver. Called whenever a
1006 * driver is bound to a device. Invokes the driver's add() ops.
1007 */
1008 static int
1009 acpi_bus_driver_init(struct acpi_device *device, struct acpi_driver *driver)
1010 {
1011 int result = 0;
1012
1013 if (!device || !driver)
1014 return -EINVAL;
1015
1016 if (!driver->ops.add)
1017 return -ENOSYS;
1018
1019 result = driver->ops.add(device);
1020 if (result)
1021 return result;
1022
1023 device->driver = driver;
1024
1025 /*
1026 * TBD - Configuration Management: Assign resources to device based
1027 * upon possible configuration and currently allocated resources.
1028 */
1029
1030 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
1031 "Driver successfully bound to device\n"));
1032 return 0;
1033 }
1034
1035 /**
1036 * acpi_bus_register_driver - register a driver with the ACPI bus
1037 * @driver: driver being registered
1038 *
1039 * Registers a driver with the ACPI bus. Searches the namespace for all
1040 * devices that match the driver's criteria and binds. Returns zero for
1041 * success or a negative error status for failure.
1042 */
1043 int acpi_bus_register_driver(struct acpi_driver *driver)
1044 {
1045 int ret;
1046
1047 if (acpi_disabled)
1048 return -ENODEV;
1049 driver->drv.name = driver->name;
1050 driver->drv.bus = &acpi_bus_type;
1051 driver->drv.owner = driver->owner;
1052
1053 ret = driver_register(&driver->drv);
1054 return ret;
1055 }
1056
1057 EXPORT_SYMBOL(acpi_bus_register_driver);
1058
1059 /**
1060 * acpi_bus_unregister_driver - unregisters a driver with the APIC bus
1061 * @driver: driver to unregister
1062 *
1063 * Unregisters a driver with the ACPI bus. Searches the namespace for all
1064 * devices that match the driver's criteria and unbinds.
1065 */
1066 void acpi_bus_unregister_driver(struct acpi_driver *driver)
1067 {
1068 driver_unregister(&driver->drv);
1069 }
1070
1071 EXPORT_SYMBOL(acpi_bus_unregister_driver);
1072
1073 /* --------------------------------------------------------------------------
1074 Device Enumeration
1075 -------------------------------------------------------------------------- */
1076 static struct acpi_device *acpi_bus_get_parent(acpi_handle handle)
1077 {
1078 struct acpi_device *device = NULL;
1079 acpi_status status;
1080
1081 /*
1082 * Fixed hardware devices do not appear in the namespace and do not
1083 * have handles, but we fabricate acpi_devices for them, so we have
1084 * to deal with them specially.
1085 */
1086 if (!handle)
1087 return acpi_root;
1088
1089 do {
1090 status = acpi_get_parent(handle, &handle);
1091 if (ACPI_FAILURE(status))
1092 return status == AE_NULL_ENTRY ? NULL : acpi_root;
1093 } while (acpi_bus_get_device(handle, &device));
1094 return device;
1095 }
1096
1097 acpi_status
1098 acpi_bus_get_ejd(acpi_handle handle, acpi_handle *ejd)
1099 {
1100 acpi_status status;
1101 acpi_handle tmp;
1102 struct acpi_buffer buffer = {ACPI_ALLOCATE_BUFFER, NULL};
1103 union acpi_object *obj;
1104
1105 status = acpi_get_handle(handle, "_EJD", &tmp);
1106 if (ACPI_FAILURE(status))
1107 return status;
1108
1109 status = acpi_evaluate_object(handle, "_EJD", NULL, &buffer);
1110 if (ACPI_SUCCESS(status)) {
1111 obj = buffer.pointer;
1112 status = acpi_get_handle(ACPI_ROOT_OBJECT, obj->string.pointer,
1113 ejd);
1114 kfree(buffer.pointer);
1115 }
1116 return status;
1117 }
1118 EXPORT_SYMBOL_GPL(acpi_bus_get_ejd);
1119
1120 void acpi_bus_data_handler(acpi_handle handle, void *context)
1121 {
1122
1123 /* TBD */
1124
1125 return;
1126 }
1127
1128 static int acpi_bus_extract_wakeup_device_power_package(acpi_handle handle,
1129 struct acpi_device_wakeup *wakeup)
1130 {
1131 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
1132 union acpi_object *package = NULL;
1133 union acpi_object *element = NULL;
1134 acpi_status status;
1135 int err = -ENODATA;
1136
1137 if (!wakeup)
1138 return -EINVAL;
1139
1140 INIT_LIST_HEAD(&wakeup->resources);
1141
1142 /* _PRW */
1143 status = acpi_evaluate_object(handle, "_PRW", NULL, &buffer);
1144 if (ACPI_FAILURE(status)) {
1145 ACPI_EXCEPTION((AE_INFO, status, "Evaluating _PRW"));
1146 return err;
1147 }
1148
1149 package = (union acpi_object *)buffer.pointer;
1150
1151 if (!package || package->package.count < 2)
1152 goto out;
1153
1154 element = &(package->package.elements[0]);
1155 if (!element)
1156 goto out;
1157
1158 if (element->type == ACPI_TYPE_PACKAGE) {
1159 if ((element->package.count < 2) ||
1160 (element->package.elements[0].type !=
1161 ACPI_TYPE_LOCAL_REFERENCE)
1162 || (element->package.elements[1].type != ACPI_TYPE_INTEGER))
1163 goto out;
1164
1165 wakeup->gpe_device =
1166 element->package.elements[0].reference.handle;
1167 wakeup->gpe_number =
1168 (u32) element->package.elements[1].integer.value;
1169 } else if (element->type == ACPI_TYPE_INTEGER) {
1170 wakeup->gpe_device = NULL;
1171 wakeup->gpe_number = element->integer.value;
1172 } else {
1173 goto out;
1174 }
1175
1176 element = &(package->package.elements[1]);
1177 if (element->type != ACPI_TYPE_INTEGER)
1178 goto out;
1179
1180 wakeup->sleep_state = element->integer.value;
1181
1182 err = acpi_extract_power_resources(package, 2, &wakeup->resources);
1183 if (err)
1184 goto out;
1185
1186 if (!list_empty(&wakeup->resources)) {
1187 int sleep_state;
1188
1189 err = acpi_power_wakeup_list_init(&wakeup->resources,
1190 &sleep_state);
1191 if (err) {
1192 acpi_handle_warn(handle, "Retrieving current states "
1193 "of wakeup power resources failed\n");
1194 acpi_power_resources_list_free(&wakeup->resources);
1195 goto out;
1196 }
1197 if (sleep_state < wakeup->sleep_state) {
1198 acpi_handle_warn(handle, "Overriding _PRW sleep state "
1199 "(S%d) by S%d from power resources\n",
1200 (int)wakeup->sleep_state, sleep_state);
1201 wakeup->sleep_state = sleep_state;
1202 }
1203 }
1204 acpi_setup_gpe_for_wake(handle, wakeup->gpe_device, wakeup->gpe_number);
1205
1206 out:
1207 kfree(buffer.pointer);
1208 return err;
1209 }
1210
1211 static void acpi_bus_set_run_wake_flags(struct acpi_device *device)
1212 {
1213 struct acpi_device_id button_device_ids[] = {
1214 {"PNP0C0C", 0},
1215 {"PNP0C0D", 0},
1216 {"PNP0C0E", 0},
1217 {"", 0},
1218 };
1219 acpi_status status;
1220 acpi_event_status event_status;
1221
1222 device->wakeup.flags.notifier_present = 0;
1223
1224 /* Power button, Lid switch always enable wakeup */
1225 if (!acpi_match_device_ids(device, button_device_ids)) {
1226 device->wakeup.flags.run_wake = 1;
1227 if (!acpi_match_device_ids(device, &button_device_ids[1])) {
1228 /* Do not use Lid/sleep button for S5 wakeup */
1229 if (device->wakeup.sleep_state == ACPI_STATE_S5)
1230 device->wakeup.sleep_state = ACPI_STATE_S4;
1231 }
1232 device_set_wakeup_capable(&device->dev, true);
1233 return;
1234 }
1235
1236 status = acpi_get_gpe_status(device->wakeup.gpe_device,
1237 device->wakeup.gpe_number,
1238 &event_status);
1239 if (status == AE_OK)
1240 device->wakeup.flags.run_wake =
1241 !!(event_status & ACPI_EVENT_FLAG_HANDLE);
1242 }
1243
1244 static void acpi_bus_get_wakeup_device_flags(struct acpi_device *device)
1245 {
1246 acpi_handle temp;
1247 acpi_status status = 0;
1248 int err;
1249
1250 /* Presence of _PRW indicates wake capable */
1251 status = acpi_get_handle(device->handle, "_PRW", &temp);
1252 if (ACPI_FAILURE(status))
1253 return;
1254
1255 err = acpi_bus_extract_wakeup_device_power_package(device->handle,
1256 &device->wakeup);
1257 if (err) {
1258 dev_err(&device->dev, "_PRW evaluation error: %d\n", err);
1259 return;
1260 }
1261
1262 device->wakeup.flags.valid = 1;
1263 device->wakeup.prepare_count = 0;
1264 acpi_bus_set_run_wake_flags(device);
1265 /* Call _PSW/_DSW object to disable its ability to wake the sleeping
1266 * system for the ACPI device with the _PRW object.
1267 * The _PSW object is depreciated in ACPI 3.0 and is replaced by _DSW.
1268 * So it is necessary to call _DSW object first. Only when it is not
1269 * present will the _PSW object used.
1270 */
1271 err = acpi_device_sleep_wake(device, 0, 0, 0);
1272 if (err)
1273 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
1274 "error in _DSW or _PSW evaluation\n"));
1275 }
1276
1277 static void acpi_bus_init_power_state(struct acpi_device *device, int state)
1278 {
1279 struct acpi_device_power_state *ps = &device->power.states[state];
1280 char pathname[5] = { '_', 'P', 'R', '0' + state, '\0' };
1281 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
1282 acpi_handle handle;
1283 acpi_status status;
1284
1285 INIT_LIST_HEAD(&ps->resources);
1286
1287 /* Evaluate "_PRx" to get referenced power resources */
1288 status = acpi_evaluate_object(device->handle, pathname, NULL, &buffer);
1289 if (ACPI_SUCCESS(status)) {
1290 union acpi_object *package = buffer.pointer;
1291
1292 if (buffer.length && package
1293 && package->type == ACPI_TYPE_PACKAGE
1294 && package->package.count) {
1295 int err = acpi_extract_power_resources(package, 0,
1296 &ps->resources);
1297 if (!err)
1298 device->power.flags.power_resources = 1;
1299 }
1300 ACPI_FREE(buffer.pointer);
1301 }
1302
1303 /* Evaluate "_PSx" to see if we can do explicit sets */
1304 pathname[2] = 'S';
1305 status = acpi_get_handle(device->handle, pathname, &handle);
1306 if (ACPI_SUCCESS(status))
1307 ps->flags.explicit_set = 1;
1308
1309 /*
1310 * State is valid if there are means to put the device into it.
1311 * D3hot is only valid if _PR3 present.
1312 */
1313 if (!list_empty(&ps->resources)
1314 || (ps->flags.explicit_set && state < ACPI_STATE_D3_HOT)) {
1315 ps->flags.valid = 1;
1316 ps->flags.os_accessible = 1;
1317 }
1318
1319 ps->power = -1; /* Unknown - driver assigned */
1320 ps->latency = -1; /* Unknown - driver assigned */
1321 }
1322
1323 static void acpi_bus_get_power_flags(struct acpi_device *device)
1324 {
1325 acpi_status status;
1326 acpi_handle handle;
1327 u32 i;
1328
1329 /* Presence of _PS0|_PR0 indicates 'power manageable' */
1330 status = acpi_get_handle(device->handle, "_PS0", &handle);
1331 if (ACPI_FAILURE(status)) {
1332 status = acpi_get_handle(device->handle, "_PR0", &handle);
1333 if (ACPI_FAILURE(status))
1334 return;
1335 }
1336
1337 device->flags.power_manageable = 1;
1338
1339 /*
1340 * Power Management Flags
1341 */
1342 status = acpi_get_handle(device->handle, "_PSC", &handle);
1343 if (ACPI_SUCCESS(status))
1344 device->power.flags.explicit_get = 1;
1345 status = acpi_get_handle(device->handle, "_IRC", &handle);
1346 if (ACPI_SUCCESS(status))
1347 device->power.flags.inrush_current = 1;
1348
1349 /*
1350 * Enumerate supported power management states
1351 */
1352 for (i = ACPI_STATE_D0; i <= ACPI_STATE_D3_HOT; i++)
1353 acpi_bus_init_power_state(device, i);
1354
1355 INIT_LIST_HEAD(&device->power.states[ACPI_STATE_D3_COLD].resources);
1356
1357 /* Set defaults for D0 and D3 states (always valid) */
1358 device->power.states[ACPI_STATE_D0].flags.valid = 1;
1359 device->power.states[ACPI_STATE_D0].power = 100;
1360 device->power.states[ACPI_STATE_D3].flags.valid = 1;
1361 device->power.states[ACPI_STATE_D3].power = 0;
1362
1363 /* Set D3cold's explicit_set flag if _PS3 exists. */
1364 if (device->power.states[ACPI_STATE_D3_HOT].flags.explicit_set)
1365 device->power.states[ACPI_STATE_D3_COLD].flags.explicit_set = 1;
1366
1367 /* Presence of _PS3 or _PRx means we can put the device into D3 cold */
1368 if (device->power.states[ACPI_STATE_D3_HOT].flags.explicit_set ||
1369 device->power.flags.power_resources)
1370 device->power.states[ACPI_STATE_D3_COLD].flags.os_accessible = 1;
1371
1372 if (acpi_bus_init_power(device)) {
1373 acpi_free_power_resources_lists(device);
1374 device->flags.power_manageable = 0;
1375 }
1376 }
1377
1378 static void acpi_bus_get_flags(struct acpi_device *device)
1379 {
1380 acpi_status status = AE_OK;
1381 acpi_handle temp = NULL;
1382
1383 /* Presence of _STA indicates 'dynamic_status' */
1384 status = acpi_get_handle(device->handle, "_STA", &temp);
1385 if (ACPI_SUCCESS(status))
1386 device->flags.dynamic_status = 1;
1387
1388 /* Presence of _RMV indicates 'removable' */
1389 status = acpi_get_handle(device->handle, "_RMV", &temp);
1390 if (ACPI_SUCCESS(status))
1391 device->flags.removable = 1;
1392
1393 /* Presence of _EJD|_EJ0 indicates 'ejectable' */
1394 status = acpi_get_handle(device->handle, "_EJD", &temp);
1395 if (ACPI_SUCCESS(status))
1396 device->flags.ejectable = 1;
1397 else {
1398 status = acpi_get_handle(device->handle, "_EJ0", &temp);
1399 if (ACPI_SUCCESS(status))
1400 device->flags.ejectable = 1;
1401 }
1402 }
1403
1404 static void acpi_device_get_busid(struct acpi_device *device)
1405 {
1406 char bus_id[5] = { '?', 0 };
1407 struct acpi_buffer buffer = { sizeof(bus_id), bus_id };
1408 int i = 0;
1409
1410 /*
1411 * Bus ID
1412 * ------
1413 * The device's Bus ID is simply the object name.
1414 * TBD: Shouldn't this value be unique (within the ACPI namespace)?
1415 */
1416 if (ACPI_IS_ROOT_DEVICE(device)) {
1417 strcpy(device->pnp.bus_id, "ACPI");
1418 return;
1419 }
1420
1421 switch (device->device_type) {
1422 case ACPI_BUS_TYPE_POWER_BUTTON:
1423 strcpy(device->pnp.bus_id, "PWRF");
1424 break;
1425 case ACPI_BUS_TYPE_SLEEP_BUTTON:
1426 strcpy(device->pnp.bus_id, "SLPF");
1427 break;
1428 default:
1429 acpi_get_name(device->handle, ACPI_SINGLE_NAME, &buffer);
1430 /* Clean up trailing underscores (if any) */
1431 for (i = 3; i > 1; i--) {
1432 if (bus_id[i] == '_')
1433 bus_id[i] = '\0';
1434 else
1435 break;
1436 }
1437 strcpy(device->pnp.bus_id, bus_id);
1438 break;
1439 }
1440 }
1441
1442 /*
1443 * acpi_bay_match - see if an acpi object is an ejectable driver bay
1444 *
1445 * If an acpi object is ejectable and has one of the ACPI ATA methods defined,
1446 * then we can safely call it an ejectable drive bay
1447 */
1448 static int acpi_bay_match(acpi_handle handle)
1449 {
1450 acpi_status status;
1451 acpi_handle tmp;
1452 acpi_handle phandle;
1453
1454 status = acpi_get_handle(handle, "_EJ0", &tmp);
1455 if (ACPI_FAILURE(status))
1456 return -ENODEV;
1457
1458 if ((ACPI_SUCCESS(acpi_get_handle(handle, "_GTF", &tmp))) ||
1459 (ACPI_SUCCESS(acpi_get_handle(handle, "_GTM", &tmp))) ||
1460 (ACPI_SUCCESS(acpi_get_handle(handle, "_STM", &tmp))) ||
1461 (ACPI_SUCCESS(acpi_get_handle(handle, "_SDD", &tmp))))
1462 return 0;
1463
1464 if (acpi_get_parent(handle, &phandle))
1465 return -ENODEV;
1466
1467 if ((ACPI_SUCCESS(acpi_get_handle(phandle, "_GTF", &tmp))) ||
1468 (ACPI_SUCCESS(acpi_get_handle(phandle, "_GTM", &tmp))) ||
1469 (ACPI_SUCCESS(acpi_get_handle(phandle, "_STM", &tmp))) ||
1470 (ACPI_SUCCESS(acpi_get_handle(phandle, "_SDD", &tmp))))
1471 return 0;
1472
1473 return -ENODEV;
1474 }
1475
1476 /*
1477 * acpi_dock_match - see if an acpi object has a _DCK method
1478 */
1479 static int acpi_dock_match(acpi_handle handle)
1480 {
1481 acpi_handle tmp;
1482 return acpi_get_handle(handle, "_DCK", &tmp);
1483 }
1484
1485 const char *acpi_device_hid(struct acpi_device *device)
1486 {
1487 struct acpi_hardware_id *hid;
1488
1489 if (list_empty(&device->pnp.ids))
1490 return dummy_hid;
1491
1492 hid = list_first_entry(&device->pnp.ids, struct acpi_hardware_id, list);
1493 return hid->id;
1494 }
1495 EXPORT_SYMBOL(acpi_device_hid);
1496
1497 static void acpi_add_id(struct acpi_device_pnp *pnp, const char *dev_id)
1498 {
1499 struct acpi_hardware_id *id;
1500
1501 id = kmalloc(sizeof(*id), GFP_KERNEL);
1502 if (!id)
1503 return;
1504
1505 id->id = kstrdup(dev_id, GFP_KERNEL);
1506 if (!id->id) {
1507 kfree(id);
1508 return;
1509 }
1510
1511 list_add_tail(&id->list, &pnp->ids);
1512 pnp->type.hardware_id = 1;
1513 }
1514
1515 /*
1516 * Old IBM workstations have a DSDT bug wherein the SMBus object
1517 * lacks the SMBUS01 HID and the methods do not have the necessary "_"
1518 * prefix. Work around this.
1519 */
1520 static int acpi_ibm_smbus_match(acpi_handle handle)
1521 {
1522 acpi_handle h_dummy;
1523 struct acpi_buffer path = {ACPI_ALLOCATE_BUFFER, NULL};
1524 int result;
1525
1526 if (!dmi_name_in_vendors("IBM"))
1527 return -ENODEV;
1528
1529 /* Look for SMBS object */
1530 result = acpi_get_name(handle, ACPI_SINGLE_NAME, &path);
1531 if (result)
1532 return result;
1533
1534 if (strcmp("SMBS", path.pointer)) {
1535 result = -ENODEV;
1536 goto out;
1537 }
1538
1539 /* Does it have the necessary (but misnamed) methods? */
1540 result = -ENODEV;
1541 if (ACPI_SUCCESS(acpi_get_handle(handle, "SBI", &h_dummy)) &&
1542 ACPI_SUCCESS(acpi_get_handle(handle, "SBR", &h_dummy)) &&
1543 ACPI_SUCCESS(acpi_get_handle(handle, "SBW", &h_dummy)))
1544 result = 0;
1545 out:
1546 kfree(path.pointer);
1547 return result;
1548 }
1549
1550 static void acpi_set_pnp_ids(acpi_handle handle, struct acpi_device_pnp *pnp,
1551 int device_type)
1552 {
1553 acpi_status status;
1554 struct acpi_device_info *info;
1555 struct acpi_pnp_device_id_list *cid_list;
1556 int i;
1557
1558 switch (device_type) {
1559 case ACPI_BUS_TYPE_DEVICE:
1560 if (handle == ACPI_ROOT_OBJECT) {
1561 acpi_add_id(pnp, ACPI_SYSTEM_HID);
1562 break;
1563 }
1564
1565 status = acpi_get_object_info(handle, &info);
1566 if (ACPI_FAILURE(status)) {
1567 pr_err(PREFIX "%s: Error reading device info\n",
1568 __func__);
1569 return;
1570 }
1571
1572 if (info->valid & ACPI_VALID_HID)
1573 acpi_add_id(pnp, info->hardware_id.string);
1574 if (info->valid & ACPI_VALID_CID) {
1575 cid_list = &info->compatible_id_list;
1576 for (i = 0; i < cid_list->count; i++)
1577 acpi_add_id(pnp, cid_list->ids[i].string);
1578 }
1579 if (info->valid & ACPI_VALID_ADR) {
1580 pnp->bus_address = info->address;
1581 pnp->type.bus_address = 1;
1582 }
1583 if (info->valid & ACPI_VALID_UID)
1584 pnp->unique_id = kstrdup(info->unique_id.string,
1585 GFP_KERNEL);
1586
1587 kfree(info);
1588
1589 /*
1590 * Some devices don't reliably have _HIDs & _CIDs, so add
1591 * synthetic HIDs to make sure drivers can find them.
1592 */
1593 if (acpi_is_video_device(handle))
1594 acpi_add_id(pnp, ACPI_VIDEO_HID);
1595 else if (ACPI_SUCCESS(acpi_bay_match(handle)))
1596 acpi_add_id(pnp, ACPI_BAY_HID);
1597 else if (ACPI_SUCCESS(acpi_dock_match(handle)))
1598 acpi_add_id(pnp, ACPI_DOCK_HID);
1599 else if (!acpi_ibm_smbus_match(handle))
1600 acpi_add_id(pnp, ACPI_SMBUS_IBM_HID);
1601 else if (list_empty(&pnp->ids) && handle == ACPI_ROOT_OBJECT) {
1602 acpi_add_id(pnp, ACPI_BUS_HID); /* \_SB, LNXSYBUS */
1603 strcpy(pnp->device_name, ACPI_BUS_DEVICE_NAME);
1604 strcpy(pnp->device_class, ACPI_BUS_CLASS);
1605 }
1606
1607 break;
1608 case ACPI_BUS_TYPE_POWER:
1609 acpi_add_id(pnp, ACPI_POWER_HID);
1610 break;
1611 case ACPI_BUS_TYPE_PROCESSOR:
1612 acpi_add_id(pnp, ACPI_PROCESSOR_OBJECT_HID);
1613 break;
1614 case ACPI_BUS_TYPE_THERMAL:
1615 acpi_add_id(pnp, ACPI_THERMAL_HID);
1616 break;
1617 case ACPI_BUS_TYPE_POWER_BUTTON:
1618 acpi_add_id(pnp, ACPI_BUTTON_HID_POWERF);
1619 break;
1620 case ACPI_BUS_TYPE_SLEEP_BUTTON:
1621 acpi_add_id(pnp, ACPI_BUTTON_HID_SLEEPF);
1622 break;
1623 }
1624 }
1625
1626 void acpi_free_pnp_ids(struct acpi_device_pnp *pnp)
1627 {
1628 struct acpi_hardware_id *id, *tmp;
1629
1630 list_for_each_entry_safe(id, tmp, &pnp->ids, list) {
1631 kfree(id->id);
1632 kfree(id);
1633 }
1634 kfree(pnp->unique_id);
1635 }
1636
1637 void acpi_init_device_object(struct acpi_device *device, acpi_handle handle,
1638 int type, unsigned long long sta)
1639 {
1640 INIT_LIST_HEAD(&device->pnp.ids);
1641 device->device_type = type;
1642 device->handle = handle;
1643 device->parent = acpi_bus_get_parent(handle);
1644 STRUCT_TO_INT(device->status) = sta;
1645 acpi_device_get_busid(device);
1646 acpi_set_pnp_ids(handle, &device->pnp, type);
1647 acpi_bus_get_flags(device);
1648 device->flags.match_driver = false;
1649 device_initialize(&device->dev);
1650 dev_set_uevent_suppress(&device->dev, true);
1651 }
1652
1653 void acpi_device_add_finalize(struct acpi_device *device)
1654 {
1655 device->flags.match_driver = true;
1656 dev_set_uevent_suppress(&device->dev, false);
1657 kobject_uevent(&device->dev.kobj, KOBJ_ADD);
1658 }
1659
1660 static int acpi_add_single_object(struct acpi_device **child,
1661 acpi_handle handle, int type,
1662 unsigned long long sta)
1663 {
1664 int result;
1665 struct acpi_device *device;
1666 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
1667
1668 device = kzalloc(sizeof(struct acpi_device), GFP_KERNEL);
1669 if (!device) {
1670 printk(KERN_ERR PREFIX "Memory allocation error\n");
1671 return -ENOMEM;
1672 }
1673
1674 acpi_init_device_object(device, handle, type, sta);
1675 acpi_bus_get_power_flags(device);
1676 acpi_bus_get_wakeup_device_flags(device);
1677
1678 result = acpi_device_add(device, acpi_device_release);
1679 if (result) {
1680 acpi_device_release(&device->dev);
1681 return result;
1682 }
1683
1684 acpi_power_add_remove_device(device, true);
1685 acpi_device_add_finalize(device);
1686 acpi_get_name(handle, ACPI_FULL_PATHNAME, &buffer);
1687 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Added %s [%s] parent %s\n",
1688 dev_name(&device->dev), (char *) buffer.pointer,
1689 device->parent ? dev_name(&device->parent->dev) : "(null)"));
1690 kfree(buffer.pointer);
1691 *child = device;
1692 return 0;
1693 }
1694
1695 static int acpi_bus_type_and_status(acpi_handle handle, int *type,
1696 unsigned long long *sta)
1697 {
1698 acpi_status status;
1699 acpi_object_type acpi_type;
1700
1701 status = acpi_get_type(handle, &acpi_type);
1702 if (ACPI_FAILURE(status))
1703 return -ENODEV;
1704
1705 switch (acpi_type) {
1706 case ACPI_TYPE_ANY: /* for ACPI_ROOT_OBJECT */
1707 case ACPI_TYPE_DEVICE:
1708 *type = ACPI_BUS_TYPE_DEVICE;
1709 status = acpi_bus_get_status_handle(handle, sta);
1710 if (ACPI_FAILURE(status))
1711 return -ENODEV;
1712 break;
1713 case ACPI_TYPE_PROCESSOR:
1714 *type = ACPI_BUS_TYPE_PROCESSOR;
1715 status = acpi_bus_get_status_handle(handle, sta);
1716 if (ACPI_FAILURE(status))
1717 return -ENODEV;
1718 break;
1719 case ACPI_TYPE_THERMAL:
1720 *type = ACPI_BUS_TYPE_THERMAL;
1721 *sta = ACPI_STA_DEFAULT;
1722 break;
1723 case ACPI_TYPE_POWER:
1724 *type = ACPI_BUS_TYPE_POWER;
1725 *sta = ACPI_STA_DEFAULT;
1726 break;
1727 default:
1728 return -ENODEV;
1729 }
1730
1731 return 0;
1732 }
1733
1734 static bool acpi_scan_handler_matching(struct acpi_scan_handler *handler,
1735 char *idstr,
1736 const struct acpi_device_id **matchid)
1737 {
1738 const struct acpi_device_id *devid;
1739
1740 for (devid = handler->ids; devid->id[0]; devid++)
1741 if (!strcmp((char *)devid->id, idstr)) {
1742 if (matchid)
1743 *matchid = devid;
1744
1745 return true;
1746 }
1747
1748 return false;
1749 }
1750
1751 static struct acpi_scan_handler *acpi_scan_match_handler(char *idstr,
1752 const struct acpi_device_id **matchid)
1753 {
1754 struct acpi_scan_handler *handler;
1755
1756 list_for_each_entry(handler, &acpi_scan_handlers_list, list_node)
1757 if (acpi_scan_handler_matching(handler, idstr, matchid))
1758 return handler;
1759
1760 return NULL;
1761 }
1762
1763 void acpi_scan_hotplug_enabled(struct acpi_hotplug_profile *hotplug, bool val)
1764 {
1765 if (!!hotplug->enabled == !!val)
1766 return;
1767
1768 mutex_lock(&acpi_scan_lock);
1769
1770 hotplug->enabled = val;
1771
1772 mutex_unlock(&acpi_scan_lock);
1773 }
1774
1775 static void acpi_scan_init_hotplug(acpi_handle handle, int type)
1776 {
1777 struct acpi_device_pnp pnp = {};
1778 struct acpi_hardware_id *hwid;
1779 struct acpi_scan_handler *handler;
1780
1781 INIT_LIST_HEAD(&pnp.ids);
1782 acpi_set_pnp_ids(handle, &pnp, type);
1783
1784 if (!pnp.type.hardware_id)
1785 goto out;
1786
1787 /*
1788 * This relies on the fact that acpi_install_notify_handler() will not
1789 * install the same notify handler routine twice for the same handle.
1790 */
1791 list_for_each_entry(hwid, &pnp.ids, list) {
1792 handler = acpi_scan_match_handler(hwid->id, NULL);
1793 if (handler && !handler->hotplug.ignore) {
1794 acpi_install_notify_handler(handle, ACPI_SYSTEM_NOTIFY,
1795 acpi_hotplug_notify_cb, handler);
1796 break;
1797 }
1798 }
1799
1800 out:
1801 acpi_free_pnp_ids(&pnp);
1802 }
1803
1804 static acpi_status acpi_bus_check_add(acpi_handle handle, u32 lvl_not_used,
1805 void *not_used, void **return_value)
1806 {
1807 struct acpi_device *device = NULL;
1808 int type;
1809 unsigned long long sta;
1810 acpi_status status;
1811 int result;
1812
1813 acpi_bus_get_device(handle, &device);
1814 if (device)
1815 goto out;
1816
1817 result = acpi_bus_type_and_status(handle, &type, &sta);
1818 if (result)
1819 return AE_OK;
1820
1821 if (type == ACPI_BUS_TYPE_POWER) {
1822 acpi_add_power_resource(handle);
1823 return AE_OK;
1824 }
1825
1826 acpi_scan_init_hotplug(handle, type);
1827
1828 if (!(sta & ACPI_STA_DEVICE_PRESENT) &&
1829 !(sta & ACPI_STA_DEVICE_FUNCTIONING)) {
1830 struct acpi_device_wakeup wakeup;
1831 acpi_handle temp;
1832
1833 status = acpi_get_handle(handle, "_PRW", &temp);
1834 if (ACPI_SUCCESS(status)) {
1835 acpi_bus_extract_wakeup_device_power_package(handle,
1836 &wakeup);
1837 acpi_power_resources_list_free(&wakeup.resources);
1838 }
1839 return AE_CTRL_DEPTH;
1840 }
1841
1842 acpi_add_single_object(&device, handle, type, sta);
1843 if (!device)
1844 return AE_CTRL_DEPTH;
1845
1846 out:
1847 if (!*return_value)
1848 *return_value = device;
1849
1850 return AE_OK;
1851 }
1852
1853 static int acpi_scan_attach_handler(struct acpi_device *device)
1854 {
1855 struct acpi_hardware_id *hwid;
1856 int ret = 0;
1857
1858 list_for_each_entry(hwid, &device->pnp.ids, list) {
1859 const struct acpi_device_id *devid;
1860 struct acpi_scan_handler *handler;
1861
1862 handler = acpi_scan_match_handler(hwid->id, &devid);
1863 if (handler) {
1864 ret = handler->attach(device, devid);
1865 if (ret > 0) {
1866 device->handler = handler;
1867 break;
1868 } else if (ret < 0) {
1869 break;
1870 }
1871 }
1872 }
1873 return ret;
1874 }
1875
1876 static acpi_status acpi_bus_device_attach(acpi_handle handle, u32 lvl_not_used,
1877 void *not_used, void **ret_not_used)
1878 {
1879 struct acpi_device *device;
1880 unsigned long long sta_not_used;
1881 int ret;
1882
1883 /*
1884 * Ignore errors ignored by acpi_bus_check_add() to avoid terminating
1885 * namespace walks prematurely.
1886 */
1887 if (acpi_bus_type_and_status(handle, &ret, &sta_not_used))
1888 return AE_OK;
1889
1890 if (acpi_bus_get_device(handle, &device))
1891 return AE_CTRL_DEPTH;
1892
1893 if (device->handler)
1894 return AE_OK;
1895
1896 ret = acpi_scan_attach_handler(device);
1897 if (ret)
1898 return ret > 0 ? AE_OK : AE_CTRL_DEPTH;
1899
1900 ret = device_attach(&device->dev);
1901 return ret >= 0 ? AE_OK : AE_CTRL_DEPTH;
1902 }
1903
1904 /**
1905 * acpi_bus_scan - Add ACPI device node objects in a given namespace scope.
1906 * @handle: Root of the namespace scope to scan.
1907 *
1908 * Scan a given ACPI tree (probably recently hot-plugged) and create and add
1909 * found devices.
1910 *
1911 * If no devices were found, -ENODEV is returned, but it does not mean that
1912 * there has been a real error. There just have been no suitable ACPI objects
1913 * in the table trunk from which the kernel could create a device and add an
1914 * appropriate driver.
1915 *
1916 * Must be called under acpi_scan_lock.
1917 */
1918 int acpi_bus_scan(acpi_handle handle)
1919 {
1920 void *device = NULL;
1921 int error = 0;
1922
1923 if (ACPI_SUCCESS(acpi_bus_check_add(handle, 0, NULL, &device)))
1924 acpi_walk_namespace(ACPI_TYPE_ANY, handle, ACPI_UINT32_MAX,
1925 acpi_bus_check_add, NULL, NULL, &device);
1926
1927 if (!device)
1928 error = -ENODEV;
1929 else if (ACPI_SUCCESS(acpi_bus_device_attach(handle, 0, NULL, NULL)))
1930 acpi_walk_namespace(ACPI_TYPE_ANY, handle, ACPI_UINT32_MAX,
1931 acpi_bus_device_attach, NULL, NULL, NULL);
1932
1933 return error;
1934 }
1935 EXPORT_SYMBOL(acpi_bus_scan);
1936
1937 static acpi_status acpi_bus_device_detach(acpi_handle handle, u32 lvl_not_used,
1938 void *not_used, void **ret_not_used)
1939 {
1940 struct acpi_device *device = NULL;
1941
1942 if (!acpi_bus_get_device(handle, &device)) {
1943 struct acpi_scan_handler *dev_handler = device->handler;
1944
1945 device->removal_type = ACPI_BUS_REMOVAL_EJECT;
1946 if (dev_handler) {
1947 if (dev_handler->detach)
1948 dev_handler->detach(device);
1949
1950 device->handler = NULL;
1951 } else {
1952 device_release_driver(&device->dev);
1953 }
1954 }
1955 return AE_OK;
1956 }
1957
1958 static acpi_status acpi_bus_remove(acpi_handle handle, u32 lvl_not_used,
1959 void *not_used, void **ret_not_used)
1960 {
1961 struct acpi_device *device = NULL;
1962
1963 if (!acpi_bus_get_device(handle, &device))
1964 acpi_device_unregister(device);
1965
1966 return AE_OK;
1967 }
1968
1969 /**
1970 * acpi_bus_trim - Remove ACPI device node and all of its descendants
1971 * @start: Root of the ACPI device nodes subtree to remove.
1972 *
1973 * Must be called under acpi_scan_lock.
1974 */
1975 void acpi_bus_trim(struct acpi_device *start)
1976 {
1977 /*
1978 * Execute acpi_bus_device_detach() as a post-order callback to detach
1979 * all ACPI drivers from the device nodes being removed.
1980 */
1981 acpi_walk_namespace(ACPI_TYPE_ANY, start->handle, ACPI_UINT32_MAX, NULL,
1982 acpi_bus_device_detach, NULL, NULL);
1983 acpi_bus_device_detach(start->handle, 0, NULL, NULL);
1984 /*
1985 * Execute acpi_bus_remove() as a post-order callback to remove device
1986 * nodes in the given namespace scope.
1987 */
1988 acpi_walk_namespace(ACPI_TYPE_ANY, start->handle, ACPI_UINT32_MAX, NULL,
1989 acpi_bus_remove, NULL, NULL);
1990 acpi_bus_remove(start->handle, 0, NULL, NULL);
1991 }
1992 EXPORT_SYMBOL_GPL(acpi_bus_trim);
1993
1994 static int acpi_bus_scan_fixed(void)
1995 {
1996 int result = 0;
1997
1998 /*
1999 * Enumerate all fixed-feature devices.
2000 */
2001 if (!(acpi_gbl_FADT.flags & ACPI_FADT_POWER_BUTTON)) {
2002 struct acpi_device *device = NULL;
2003
2004 result = acpi_add_single_object(&device, NULL,
2005 ACPI_BUS_TYPE_POWER_BUTTON,
2006 ACPI_STA_DEFAULT);
2007 if (result)
2008 return result;
2009
2010 result = device_attach(&device->dev);
2011 if (result < 0)
2012 return result;
2013
2014 device_init_wakeup(&device->dev, true);
2015 }
2016
2017 if (!(acpi_gbl_FADT.flags & ACPI_FADT_SLEEP_BUTTON)) {
2018 struct acpi_device *device = NULL;
2019
2020 result = acpi_add_single_object(&device, NULL,
2021 ACPI_BUS_TYPE_SLEEP_BUTTON,
2022 ACPI_STA_DEFAULT);
2023 if (result)
2024 return result;
2025
2026 result = device_attach(&device->dev);
2027 }
2028
2029 return result < 0 ? result : 0;
2030 }
2031
2032 int __init acpi_scan_init(void)
2033 {
2034 int result;
2035
2036 result = bus_register(&acpi_bus_type);
2037 if (result) {
2038 /* We don't want to quit even if we failed to add suspend/resume */
2039 printk(KERN_ERR PREFIX "Could not register bus type\n");
2040 }
2041
2042 acpi_pci_root_init();
2043 acpi_pci_link_init();
2044 acpi_platform_init();
2045 acpi_lpss_init();
2046 acpi_cmos_rtc_init();
2047 acpi_container_init();
2048 acpi_memory_hotplug_init();
2049 acpi_dock_init();
2050
2051 mutex_lock(&acpi_scan_lock);
2052 /*
2053 * Enumerate devices in the ACPI namespace.
2054 */
2055 result = acpi_bus_scan(ACPI_ROOT_OBJECT);
2056 if (result)
2057 goto out;
2058
2059 result = acpi_bus_get_device(ACPI_ROOT_OBJECT, &acpi_root);
2060 if (result)
2061 goto out;
2062
2063 result = acpi_bus_scan_fixed();
2064 if (result) {
2065 acpi_device_unregister(acpi_root);
2066 goto out;
2067 }
2068
2069 acpi_update_all_gpes();
2070
2071 acpi_pci_root_hp_init();
2072
2073 out:
2074 mutex_unlock(&acpi_scan_lock);
2075 return result;
2076 }
kernel source for telekom puls (alcatel/mediatek)