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drivers: power: report battery voltage in AOSP compatible format
[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 void 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 }
779
780 static acpi_status acpi_device_fixed_event(void *data)
781 {
782 acpi_os_execute(OSL_NOTIFY_HANDLER, acpi_device_notify_fixed, data);
783 return AE_OK;
784 }
785
786 static int acpi_device_install_notify_handler(struct acpi_device *device)
787 {
788 acpi_status status;
789
790 if (device->device_type == ACPI_BUS_TYPE_POWER_BUTTON)
791 status =
792 acpi_install_fixed_event_handler(ACPI_EVENT_POWER_BUTTON,
793 acpi_device_fixed_event,
794 device);
795 else if (device->device_type == ACPI_BUS_TYPE_SLEEP_BUTTON)
796 status =
797 acpi_install_fixed_event_handler(ACPI_EVENT_SLEEP_BUTTON,
798 acpi_device_fixed_event,
799 device);
800 else
801 status = acpi_install_notify_handler(device->handle,
802 ACPI_DEVICE_NOTIFY,
803 acpi_device_notify,
804 device);
805
806 if (ACPI_FAILURE(status))
807 return -EINVAL;
808 return 0;
809 }
810
811 static void acpi_device_remove_notify_handler(struct acpi_device *device)
812 {
813 if (device->device_type == ACPI_BUS_TYPE_POWER_BUTTON)
814 acpi_remove_fixed_event_handler(ACPI_EVENT_POWER_BUTTON,
815 acpi_device_fixed_event);
816 else if (device->device_type == ACPI_BUS_TYPE_SLEEP_BUTTON)
817 acpi_remove_fixed_event_handler(ACPI_EVENT_SLEEP_BUTTON,
818 acpi_device_fixed_event);
819 else
820 acpi_remove_notify_handler(device->handle, ACPI_DEVICE_NOTIFY,
821 acpi_device_notify);
822 }
823
824 static int acpi_bus_driver_init(struct acpi_device *, struct acpi_driver *);
825 static int acpi_device_probe(struct device * dev)
826 {
827 struct acpi_device *acpi_dev = to_acpi_device(dev);
828 struct acpi_driver *acpi_drv = to_acpi_driver(dev->driver);
829 int ret;
830
831 ret = acpi_bus_driver_init(acpi_dev, acpi_drv);
832 if (!ret) {
833 if (acpi_drv->ops.notify) {
834 ret = acpi_device_install_notify_handler(acpi_dev);
835 if (ret) {
836 if (acpi_drv->ops.remove)
837 acpi_drv->ops.remove(acpi_dev);
838 acpi_dev->driver = NULL;
839 acpi_dev->driver_data = NULL;
840 return ret;
841 }
842 }
843
844 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
845 "Found driver [%s] for device [%s]\n",
846 acpi_drv->name, acpi_dev->pnp.bus_id));
847 get_device(dev);
848 }
849 return ret;
850 }
851
852 static int acpi_device_remove(struct device * dev)
853 {
854 struct acpi_device *acpi_dev = to_acpi_device(dev);
855 struct acpi_driver *acpi_drv = acpi_dev->driver;
856
857 if (acpi_drv) {
858 if (acpi_drv->ops.notify)
859 acpi_device_remove_notify_handler(acpi_dev);
860 if (acpi_drv->ops.remove)
861 acpi_drv->ops.remove(acpi_dev);
862 }
863 acpi_dev->driver = NULL;
864 acpi_dev->driver_data = NULL;
865
866 put_device(dev);
867 return 0;
868 }
869
870 struct bus_type acpi_bus_type = {
871 .name = "acpi",
872 .match = acpi_bus_match,
873 .probe = acpi_device_probe,
874 .remove = acpi_device_remove,
875 .uevent = acpi_device_uevent,
876 };
877
878 int acpi_device_add(struct acpi_device *device,
879 void (*release)(struct device *))
880 {
881 int result;
882 struct acpi_device_bus_id *acpi_device_bus_id, *new_bus_id;
883 int found = 0;
884
885 if (device->handle) {
886 acpi_status status;
887
888 status = acpi_attach_data(device->handle, acpi_bus_data_handler,
889 device);
890 if (ACPI_FAILURE(status)) {
891 acpi_handle_err(device->handle,
892 "Unable to attach device data\n");
893 return -ENODEV;
894 }
895 }
896
897 /*
898 * Linkage
899 * -------
900 * Link this device to its parent and siblings.
901 */
902 INIT_LIST_HEAD(&device->children);
903 INIT_LIST_HEAD(&device->node);
904 INIT_LIST_HEAD(&device->wakeup_list);
905 INIT_LIST_HEAD(&device->physical_node_list);
906 mutex_init(&device->physical_node_lock);
907 INIT_LIST_HEAD(&device->power_dependent);
908
909 new_bus_id = kzalloc(sizeof(struct acpi_device_bus_id), GFP_KERNEL);
910 if (!new_bus_id) {
911 pr_err(PREFIX "Memory allocation error\n");
912 result = -ENOMEM;
913 goto err_detach;
914 }
915
916 mutex_lock(&acpi_device_lock);
917 /*
918 * Find suitable bus_id and instance number in acpi_bus_id_list
919 * If failed, create one and link it into acpi_bus_id_list
920 */
921 list_for_each_entry(acpi_device_bus_id, &acpi_bus_id_list, node) {
922 if (!strcmp(acpi_device_bus_id->bus_id,
923 acpi_device_hid(device))) {
924 acpi_device_bus_id->instance_no++;
925 found = 1;
926 kfree(new_bus_id);
927 break;
928 }
929 }
930 if (!found) {
931 acpi_device_bus_id = new_bus_id;
932 strcpy(acpi_device_bus_id->bus_id, acpi_device_hid(device));
933 acpi_device_bus_id->instance_no = 0;
934 list_add_tail(&acpi_device_bus_id->node, &acpi_bus_id_list);
935 }
936 dev_set_name(&device->dev, "%s:%02x", acpi_device_bus_id->bus_id, acpi_device_bus_id->instance_no);
937
938 if (device->parent)
939 list_add_tail(&device->node, &device->parent->children);
940
941 if (device->wakeup.flags.valid)
942 list_add_tail(&device->wakeup_list, &acpi_wakeup_device_list);
943 mutex_unlock(&acpi_device_lock);
944
945 if (device->parent)
946 device->dev.parent = &device->parent->dev;
947 device->dev.bus = &acpi_bus_type;
948 device->dev.release = release;
949 result = device_add(&device->dev);
950 if (result) {
951 dev_err(&device->dev, "Error registering device\n");
952 goto err;
953 }
954
955 result = acpi_device_setup_files(device);
956 if (result)
957 printk(KERN_ERR PREFIX "Error creating sysfs interface for device %s\n",
958 dev_name(&device->dev));
959
960 device->removal_type = ACPI_BUS_REMOVAL_NORMAL;
961 return 0;
962
963 err:
964 mutex_lock(&acpi_device_lock);
965 if (device->parent)
966 list_del(&device->node);
967 list_del(&device->wakeup_list);
968 mutex_unlock(&acpi_device_lock);
969
970 err_detach:
971 acpi_detach_data(device->handle, acpi_bus_data_handler);
972 return result;
973 }
974
975 static void acpi_device_unregister(struct acpi_device *device)
976 {
977 mutex_lock(&acpi_device_lock);
978 if (device->parent)
979 list_del(&device->node);
980
981 list_del(&device->wakeup_list);
982 mutex_unlock(&acpi_device_lock);
983
984 acpi_detach_data(device->handle, acpi_bus_data_handler);
985
986 acpi_power_add_remove_device(device, false);
987 acpi_device_remove_files(device);
988 if (device->remove)
989 device->remove(device);
990
991 device_del(&device->dev);
992 /*
993 * Transition the device to D3cold to drop the reference counts of all
994 * power resources the device depends on and turn off the ones that have
995 * no more references.
996 */
997 acpi_device_set_power(device, ACPI_STATE_D3_COLD);
998 device->handle = NULL;
999 put_device(&device->dev);
1000 }
1001
1002 /* --------------------------------------------------------------------------
1003 Driver Management
1004 -------------------------------------------------------------------------- */
1005 /**
1006 * acpi_bus_driver_init - add a device to a driver
1007 * @device: the device to add and initialize
1008 * @driver: driver for the device
1009 *
1010 * Used to initialize a device via its device driver. Called whenever a
1011 * driver is bound to a device. Invokes the driver's add() ops.
1012 */
1013 static int
1014 acpi_bus_driver_init(struct acpi_device *device, struct acpi_driver *driver)
1015 {
1016 int result = 0;
1017
1018 if (!device || !driver)
1019 return -EINVAL;
1020
1021 if (!driver->ops.add)
1022 return -ENOSYS;
1023
1024 result = driver->ops.add(device);
1025 if (result)
1026 return result;
1027
1028 device->driver = driver;
1029
1030 /*
1031 * TBD - Configuration Management: Assign resources to device based
1032 * upon possible configuration and currently allocated resources.
1033 */
1034
1035 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
1036 "Driver successfully bound to device\n"));
1037 return 0;
1038 }
1039
1040 /**
1041 * acpi_bus_register_driver - register a driver with the ACPI bus
1042 * @driver: driver being registered
1043 *
1044 * Registers a driver with the ACPI bus. Searches the namespace for all
1045 * devices that match the driver's criteria and binds. Returns zero for
1046 * success or a negative error status for failure.
1047 */
1048 int acpi_bus_register_driver(struct acpi_driver *driver)
1049 {
1050 int ret;
1051
1052 if (acpi_disabled)
1053 return -ENODEV;
1054 driver->drv.name = driver->name;
1055 driver->drv.bus = &acpi_bus_type;
1056 driver->drv.owner = driver->owner;
1057
1058 ret = driver_register(&driver->drv);
1059 return ret;
1060 }
1061
1062 EXPORT_SYMBOL(acpi_bus_register_driver);
1063
1064 /**
1065 * acpi_bus_unregister_driver - unregisters a driver with the APIC bus
1066 * @driver: driver to unregister
1067 *
1068 * Unregisters a driver with the ACPI bus. Searches the namespace for all
1069 * devices that match the driver's criteria and unbinds.
1070 */
1071 void acpi_bus_unregister_driver(struct acpi_driver *driver)
1072 {
1073 driver_unregister(&driver->drv);
1074 }
1075
1076 EXPORT_SYMBOL(acpi_bus_unregister_driver);
1077
1078 /* --------------------------------------------------------------------------
1079 Device Enumeration
1080 -------------------------------------------------------------------------- */
1081 static struct acpi_device *acpi_bus_get_parent(acpi_handle handle)
1082 {
1083 struct acpi_device *device = NULL;
1084 acpi_status status;
1085
1086 /*
1087 * Fixed hardware devices do not appear in the namespace and do not
1088 * have handles, but we fabricate acpi_devices for them, so we have
1089 * to deal with them specially.
1090 */
1091 if (!handle)
1092 return acpi_root;
1093
1094 do {
1095 status = acpi_get_parent(handle, &handle);
1096 if (ACPI_FAILURE(status))
1097 return status == AE_NULL_ENTRY ? NULL : acpi_root;
1098 } while (acpi_bus_get_device(handle, &device));
1099 return device;
1100 }
1101
1102 acpi_status
1103 acpi_bus_get_ejd(acpi_handle handle, acpi_handle *ejd)
1104 {
1105 acpi_status status;
1106 acpi_handle tmp;
1107 struct acpi_buffer buffer = {ACPI_ALLOCATE_BUFFER, NULL};
1108 union acpi_object *obj;
1109
1110 status = acpi_get_handle(handle, "_EJD", &tmp);
1111 if (ACPI_FAILURE(status))
1112 return status;
1113
1114 status = acpi_evaluate_object(handle, "_EJD", NULL, &buffer);
1115 if (ACPI_SUCCESS(status)) {
1116 obj = buffer.pointer;
1117 status = acpi_get_handle(ACPI_ROOT_OBJECT, obj->string.pointer,
1118 ejd);
1119 kfree(buffer.pointer);
1120 }
1121 return status;
1122 }
1123 EXPORT_SYMBOL_GPL(acpi_bus_get_ejd);
1124
1125 void acpi_bus_data_handler(acpi_handle handle, void *context)
1126 {
1127
1128 /* TBD */
1129
1130 return;
1131 }
1132
1133 static int acpi_bus_extract_wakeup_device_power_package(acpi_handle handle,
1134 struct acpi_device_wakeup *wakeup)
1135 {
1136 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
1137 union acpi_object *package = NULL;
1138 union acpi_object *element = NULL;
1139 acpi_status status;
1140 int err = -ENODATA;
1141
1142 if (!wakeup)
1143 return -EINVAL;
1144
1145 INIT_LIST_HEAD(&wakeup->resources);
1146
1147 /* _PRW */
1148 status = acpi_evaluate_object(handle, "_PRW", NULL, &buffer);
1149 if (ACPI_FAILURE(status)) {
1150 ACPI_EXCEPTION((AE_INFO, status, "Evaluating _PRW"));
1151 return err;
1152 }
1153
1154 package = (union acpi_object *)buffer.pointer;
1155
1156 if (!package || package->package.count < 2)
1157 goto out;
1158
1159 element = &(package->package.elements[0]);
1160 if (!element)
1161 goto out;
1162
1163 if (element->type == ACPI_TYPE_PACKAGE) {
1164 if ((element->package.count < 2) ||
1165 (element->package.elements[0].type !=
1166 ACPI_TYPE_LOCAL_REFERENCE)
1167 || (element->package.elements[1].type != ACPI_TYPE_INTEGER))
1168 goto out;
1169
1170 wakeup->gpe_device =
1171 element->package.elements[0].reference.handle;
1172 wakeup->gpe_number =
1173 (u32) element->package.elements[1].integer.value;
1174 } else if (element->type == ACPI_TYPE_INTEGER) {
1175 wakeup->gpe_device = NULL;
1176 wakeup->gpe_number = element->integer.value;
1177 } else {
1178 goto out;
1179 }
1180
1181 element = &(package->package.elements[1]);
1182 if (element->type != ACPI_TYPE_INTEGER)
1183 goto out;
1184
1185 wakeup->sleep_state = element->integer.value;
1186
1187 err = acpi_extract_power_resources(package, 2, &wakeup->resources);
1188 if (err)
1189 goto out;
1190
1191 if (!list_empty(&wakeup->resources)) {
1192 int sleep_state;
1193
1194 err = acpi_power_wakeup_list_init(&wakeup->resources,
1195 &sleep_state);
1196 if (err) {
1197 acpi_handle_warn(handle, "Retrieving current states "
1198 "of wakeup power resources failed\n");
1199 acpi_power_resources_list_free(&wakeup->resources);
1200 goto out;
1201 }
1202 if (sleep_state < wakeup->sleep_state) {
1203 acpi_handle_warn(handle, "Overriding _PRW sleep state "
1204 "(S%d) by S%d from power resources\n",
1205 (int)wakeup->sleep_state, sleep_state);
1206 wakeup->sleep_state = sleep_state;
1207 }
1208 }
1209 acpi_setup_gpe_for_wake(handle, wakeup->gpe_device, wakeup->gpe_number);
1210
1211 out:
1212 kfree(buffer.pointer);
1213 return err;
1214 }
1215
1216 static void acpi_bus_set_run_wake_flags(struct acpi_device *device)
1217 {
1218 struct acpi_device_id button_device_ids[] = {
1219 {"PNP0C0C", 0},
1220 {"PNP0C0D", 0},
1221 {"PNP0C0E", 0},
1222 {"", 0},
1223 };
1224 acpi_status status;
1225 acpi_event_status event_status;
1226
1227 device->wakeup.flags.notifier_present = 0;
1228
1229 /* Power button, Lid switch always enable wakeup */
1230 if (!acpi_match_device_ids(device, button_device_ids)) {
1231 device->wakeup.flags.run_wake = 1;
1232 if (!acpi_match_device_ids(device, &button_device_ids[1])) {
1233 /* Do not use Lid/sleep button for S5 wakeup */
1234 if (device->wakeup.sleep_state == ACPI_STATE_S5)
1235 device->wakeup.sleep_state = ACPI_STATE_S4;
1236 }
1237 device_set_wakeup_capable(&device->dev, true);
1238 return;
1239 }
1240
1241 status = acpi_get_gpe_status(device->wakeup.gpe_device,
1242 device->wakeup.gpe_number,
1243 &event_status);
1244 if (status == AE_OK)
1245 device->wakeup.flags.run_wake =
1246 !!(event_status & ACPI_EVENT_FLAG_HANDLE);
1247 }
1248
1249 static void acpi_bus_get_wakeup_device_flags(struct acpi_device *device)
1250 {
1251 acpi_handle temp;
1252 acpi_status status = 0;
1253 int err;
1254
1255 /* Presence of _PRW indicates wake capable */
1256 status = acpi_get_handle(device->handle, "_PRW", &temp);
1257 if (ACPI_FAILURE(status))
1258 return;
1259
1260 err = acpi_bus_extract_wakeup_device_power_package(device->handle,
1261 &device->wakeup);
1262 if (err) {
1263 dev_err(&device->dev, "_PRW evaluation error: %d\n", err);
1264 return;
1265 }
1266
1267 device->wakeup.flags.valid = 1;
1268 device->wakeup.prepare_count = 0;
1269 acpi_bus_set_run_wake_flags(device);
1270 /* Call _PSW/_DSW object to disable its ability to wake the sleeping
1271 * system for the ACPI device with the _PRW object.
1272 * The _PSW object is depreciated in ACPI 3.0 and is replaced by _DSW.
1273 * So it is necessary to call _DSW object first. Only when it is not
1274 * present will the _PSW object used.
1275 */
1276 err = acpi_device_sleep_wake(device, 0, 0, 0);
1277 if (err)
1278 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
1279 "error in _DSW or _PSW evaluation\n"));
1280 }
1281
1282 static void acpi_bus_init_power_state(struct acpi_device *device, int state)
1283 {
1284 struct acpi_device_power_state *ps = &device->power.states[state];
1285 char pathname[5] = { '_', 'P', 'R', '0' + state, '\0' };
1286 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
1287 acpi_handle handle;
1288 acpi_status status;
1289
1290 INIT_LIST_HEAD(&ps->resources);
1291
1292 /* Evaluate "_PRx" to get referenced power resources */
1293 status = acpi_evaluate_object(device->handle, pathname, NULL, &buffer);
1294 if (ACPI_SUCCESS(status)) {
1295 union acpi_object *package = buffer.pointer;
1296
1297 if (buffer.length && package
1298 && package->type == ACPI_TYPE_PACKAGE
1299 && package->package.count) {
1300 int err = acpi_extract_power_resources(package, 0,
1301 &ps->resources);
1302 if (!err)
1303 device->power.flags.power_resources = 1;
1304 }
1305 ACPI_FREE(buffer.pointer);
1306 }
1307
1308 /* Evaluate "_PSx" to see if we can do explicit sets */
1309 pathname[2] = 'S';
1310 status = acpi_get_handle(device->handle, pathname, &handle);
1311 if (ACPI_SUCCESS(status))
1312 ps->flags.explicit_set = 1;
1313
1314 /*
1315 * State is valid if there are means to put the device into it.
1316 * D3hot is only valid if _PR3 present.
1317 */
1318 if (!list_empty(&ps->resources)
1319 || (ps->flags.explicit_set && state < ACPI_STATE_D3_HOT)) {
1320 ps->flags.valid = 1;
1321 ps->flags.os_accessible = 1;
1322 }
1323
1324 ps->power = -1; /* Unknown - driver assigned */
1325 ps->latency = -1; /* Unknown - driver assigned */
1326 }
1327
1328 static void acpi_bus_get_power_flags(struct acpi_device *device)
1329 {
1330 acpi_status status;
1331 acpi_handle handle;
1332 u32 i;
1333
1334 /* Presence of _PS0|_PR0 indicates 'power manageable' */
1335 status = acpi_get_handle(device->handle, "_PS0", &handle);
1336 if (ACPI_FAILURE(status)) {
1337 status = acpi_get_handle(device->handle, "_PR0", &handle);
1338 if (ACPI_FAILURE(status))
1339 return;
1340 }
1341
1342 device->flags.power_manageable = 1;
1343
1344 /*
1345 * Power Management Flags
1346 */
1347 status = acpi_get_handle(device->handle, "_PSC", &handle);
1348 if (ACPI_SUCCESS(status))
1349 device->power.flags.explicit_get = 1;
1350 status = acpi_get_handle(device->handle, "_IRC", &handle);
1351 if (ACPI_SUCCESS(status))
1352 device->power.flags.inrush_current = 1;
1353
1354 /*
1355 * Enumerate supported power management states
1356 */
1357 for (i = ACPI_STATE_D0; i <= ACPI_STATE_D3_HOT; i++)
1358 acpi_bus_init_power_state(device, i);
1359
1360 INIT_LIST_HEAD(&device->power.states[ACPI_STATE_D3_COLD].resources);
1361
1362 /* Set defaults for D0 and D3 states (always valid) */
1363 device->power.states[ACPI_STATE_D0].flags.valid = 1;
1364 device->power.states[ACPI_STATE_D0].power = 100;
1365 device->power.states[ACPI_STATE_D3].flags.valid = 1;
1366 device->power.states[ACPI_STATE_D3].power = 0;
1367
1368 /* Set D3cold's explicit_set flag if _PS3 exists. */
1369 if (device->power.states[ACPI_STATE_D3_HOT].flags.explicit_set)
1370 device->power.states[ACPI_STATE_D3_COLD].flags.explicit_set = 1;
1371
1372 /* Presence of _PS3 or _PRx means we can put the device into D3 cold */
1373 if (device->power.states[ACPI_STATE_D3_HOT].flags.explicit_set ||
1374 device->power.flags.power_resources)
1375 device->power.states[ACPI_STATE_D3_COLD].flags.os_accessible = 1;
1376
1377 if (acpi_bus_init_power(device)) {
1378 acpi_free_power_resources_lists(device);
1379 device->flags.power_manageable = 0;
1380 }
1381 }
1382
1383 static void acpi_bus_get_flags(struct acpi_device *device)
1384 {
1385 acpi_status status = AE_OK;
1386 acpi_handle temp = NULL;
1387
1388 /* Presence of _STA indicates 'dynamic_status' */
1389 status = acpi_get_handle(device->handle, "_STA", &temp);
1390 if (ACPI_SUCCESS(status))
1391 device->flags.dynamic_status = 1;
1392
1393 /* Presence of _RMV indicates 'removable' */
1394 status = acpi_get_handle(device->handle, "_RMV", &temp);
1395 if (ACPI_SUCCESS(status))
1396 device->flags.removable = 1;
1397
1398 /* Presence of _EJD|_EJ0 indicates 'ejectable' */
1399 status = acpi_get_handle(device->handle, "_EJD", &temp);
1400 if (ACPI_SUCCESS(status))
1401 device->flags.ejectable = 1;
1402 else {
1403 status = acpi_get_handle(device->handle, "_EJ0", &temp);
1404 if (ACPI_SUCCESS(status))
1405 device->flags.ejectable = 1;
1406 }
1407 }
1408
1409 static void acpi_device_get_busid(struct acpi_device *device)
1410 {
1411 char bus_id[5] = { '?', 0 };
1412 struct acpi_buffer buffer = { sizeof(bus_id), bus_id };
1413 int i = 0;
1414
1415 /*
1416 * Bus ID
1417 * ------
1418 * The device's Bus ID is simply the object name.
1419 * TBD: Shouldn't this value be unique (within the ACPI namespace)?
1420 */
1421 if (ACPI_IS_ROOT_DEVICE(device)) {
1422 strcpy(device->pnp.bus_id, "ACPI");
1423 return;
1424 }
1425
1426 switch (device->device_type) {
1427 case ACPI_BUS_TYPE_POWER_BUTTON:
1428 strcpy(device->pnp.bus_id, "PWRF");
1429 break;
1430 case ACPI_BUS_TYPE_SLEEP_BUTTON:
1431 strcpy(device->pnp.bus_id, "SLPF");
1432 break;
1433 default:
1434 acpi_get_name(device->handle, ACPI_SINGLE_NAME, &buffer);
1435 /* Clean up trailing underscores (if any) */
1436 for (i = 3; i > 1; i--) {
1437 if (bus_id[i] == '_')
1438 bus_id[i] = '\0';
1439 else
1440 break;
1441 }
1442 strcpy(device->pnp.bus_id, bus_id);
1443 break;
1444 }
1445 }
1446
1447 /*
1448 * acpi_bay_match - see if an acpi object is an ejectable driver bay
1449 *
1450 * If an acpi object is ejectable and has one of the ACPI ATA methods defined,
1451 * then we can safely call it an ejectable drive bay
1452 */
1453 static int acpi_bay_match(acpi_handle handle)
1454 {
1455 acpi_status status;
1456 acpi_handle tmp;
1457 acpi_handle phandle;
1458
1459 status = acpi_get_handle(handle, "_EJ0", &tmp);
1460 if (ACPI_FAILURE(status))
1461 return -ENODEV;
1462
1463 if ((ACPI_SUCCESS(acpi_get_handle(handle, "_GTF", &tmp))) ||
1464 (ACPI_SUCCESS(acpi_get_handle(handle, "_GTM", &tmp))) ||
1465 (ACPI_SUCCESS(acpi_get_handle(handle, "_STM", &tmp))) ||
1466 (ACPI_SUCCESS(acpi_get_handle(handle, "_SDD", &tmp))))
1467 return 0;
1468
1469 if (acpi_get_parent(handle, &phandle))
1470 return -ENODEV;
1471
1472 if ((ACPI_SUCCESS(acpi_get_handle(phandle, "_GTF", &tmp))) ||
1473 (ACPI_SUCCESS(acpi_get_handle(phandle, "_GTM", &tmp))) ||
1474 (ACPI_SUCCESS(acpi_get_handle(phandle, "_STM", &tmp))) ||
1475 (ACPI_SUCCESS(acpi_get_handle(phandle, "_SDD", &tmp))))
1476 return 0;
1477
1478 return -ENODEV;
1479 }
1480
1481 /*
1482 * acpi_dock_match - see if an acpi object has a _DCK method
1483 */
1484 static int acpi_dock_match(acpi_handle handle)
1485 {
1486 acpi_handle tmp;
1487 return acpi_get_handle(handle, "_DCK", &tmp);
1488 }
1489
1490 const char *acpi_device_hid(struct acpi_device *device)
1491 {
1492 struct acpi_hardware_id *hid;
1493
1494 if (list_empty(&device->pnp.ids))
1495 return dummy_hid;
1496
1497 hid = list_first_entry(&device->pnp.ids, struct acpi_hardware_id, list);
1498 return hid->id;
1499 }
1500 EXPORT_SYMBOL(acpi_device_hid);
1501
1502 static void acpi_add_id(struct acpi_device_pnp *pnp, const char *dev_id)
1503 {
1504 struct acpi_hardware_id *id;
1505
1506 id = kmalloc(sizeof(*id), GFP_KERNEL);
1507 if (!id)
1508 return;
1509
1510 id->id = kstrdup(dev_id, GFP_KERNEL);
1511 if (!id->id) {
1512 kfree(id);
1513 return;
1514 }
1515
1516 list_add_tail(&id->list, &pnp->ids);
1517 pnp->type.hardware_id = 1;
1518 }
1519
1520 /*
1521 * Old IBM workstations have a DSDT bug wherein the SMBus object
1522 * lacks the SMBUS01 HID and the methods do not have the necessary "_"
1523 * prefix. Work around this.
1524 */
1525 static int acpi_ibm_smbus_match(acpi_handle handle)
1526 {
1527 acpi_handle h_dummy;
1528 struct acpi_buffer path = {ACPI_ALLOCATE_BUFFER, NULL};
1529 int result;
1530
1531 if (!dmi_name_in_vendors("IBM"))
1532 return -ENODEV;
1533
1534 /* Look for SMBS object */
1535 result = acpi_get_name(handle, ACPI_SINGLE_NAME, &path);
1536 if (result)
1537 return result;
1538
1539 if (strcmp("SMBS", path.pointer)) {
1540 result = -ENODEV;
1541 goto out;
1542 }
1543
1544 /* Does it have the necessary (but misnamed) methods? */
1545 result = -ENODEV;
1546 if (ACPI_SUCCESS(acpi_get_handle(handle, "SBI", &h_dummy)) &&
1547 ACPI_SUCCESS(acpi_get_handle(handle, "SBR", &h_dummy)) &&
1548 ACPI_SUCCESS(acpi_get_handle(handle, "SBW", &h_dummy)))
1549 result = 0;
1550 out:
1551 kfree(path.pointer);
1552 return result;
1553 }
1554
1555 static void acpi_set_pnp_ids(acpi_handle handle, struct acpi_device_pnp *pnp,
1556 int device_type)
1557 {
1558 acpi_status status;
1559 struct acpi_device_info *info;
1560 struct acpi_pnp_device_id_list *cid_list;
1561 int i;
1562
1563 switch (device_type) {
1564 case ACPI_BUS_TYPE_DEVICE:
1565 if (handle == ACPI_ROOT_OBJECT) {
1566 acpi_add_id(pnp, ACPI_SYSTEM_HID);
1567 break;
1568 }
1569
1570 status = acpi_get_object_info(handle, &info);
1571 if (ACPI_FAILURE(status)) {
1572 pr_err(PREFIX "%s: Error reading device info\n",
1573 __func__);
1574 return;
1575 }
1576
1577 if (info->valid & ACPI_VALID_HID)
1578 acpi_add_id(pnp, info->hardware_id.string);
1579 if (info->valid & ACPI_VALID_CID) {
1580 cid_list = &info->compatible_id_list;
1581 for (i = 0; i < cid_list->count; i++)
1582 acpi_add_id(pnp, cid_list->ids[i].string);
1583 }
1584 if (info->valid & ACPI_VALID_ADR) {
1585 pnp->bus_address = info->address;
1586 pnp->type.bus_address = 1;
1587 }
1588 if (info->valid & ACPI_VALID_UID)
1589 pnp->unique_id = kstrdup(info->unique_id.string,
1590 GFP_KERNEL);
1591
1592 kfree(info);
1593
1594 /*
1595 * Some devices don't reliably have _HIDs & _CIDs, so add
1596 * synthetic HIDs to make sure drivers can find them.
1597 */
1598 if (acpi_is_video_device(handle))
1599 acpi_add_id(pnp, ACPI_VIDEO_HID);
1600 else if (ACPI_SUCCESS(acpi_bay_match(handle)))
1601 acpi_add_id(pnp, ACPI_BAY_HID);
1602 else if (ACPI_SUCCESS(acpi_dock_match(handle)))
1603 acpi_add_id(pnp, ACPI_DOCK_HID);
1604 else if (!acpi_ibm_smbus_match(handle))
1605 acpi_add_id(pnp, ACPI_SMBUS_IBM_HID);
1606 else if (list_empty(&pnp->ids) && handle == ACPI_ROOT_OBJECT) {
1607 acpi_add_id(pnp, ACPI_BUS_HID); /* \_SB, LNXSYBUS */
1608 strcpy(pnp->device_name, ACPI_BUS_DEVICE_NAME);
1609 strcpy(pnp->device_class, ACPI_BUS_CLASS);
1610 }
1611
1612 break;
1613 case ACPI_BUS_TYPE_POWER:
1614 acpi_add_id(pnp, ACPI_POWER_HID);
1615 break;
1616 case ACPI_BUS_TYPE_PROCESSOR:
1617 acpi_add_id(pnp, ACPI_PROCESSOR_OBJECT_HID);
1618 break;
1619 case ACPI_BUS_TYPE_THERMAL:
1620 acpi_add_id(pnp, ACPI_THERMAL_HID);
1621 break;
1622 case ACPI_BUS_TYPE_POWER_BUTTON:
1623 acpi_add_id(pnp, ACPI_BUTTON_HID_POWERF);
1624 break;
1625 case ACPI_BUS_TYPE_SLEEP_BUTTON:
1626 acpi_add_id(pnp, ACPI_BUTTON_HID_SLEEPF);
1627 break;
1628 }
1629 }
1630
1631 void acpi_free_pnp_ids(struct acpi_device_pnp *pnp)
1632 {
1633 struct acpi_hardware_id *id, *tmp;
1634
1635 list_for_each_entry_safe(id, tmp, &pnp->ids, list) {
1636 kfree(id->id);
1637 kfree(id);
1638 }
1639 kfree(pnp->unique_id);
1640 }
1641
1642 void acpi_init_device_object(struct acpi_device *device, acpi_handle handle,
1643 int type, unsigned long long sta)
1644 {
1645 INIT_LIST_HEAD(&device->pnp.ids);
1646 device->device_type = type;
1647 device->handle = handle;
1648 device->parent = acpi_bus_get_parent(handle);
1649 STRUCT_TO_INT(device->status) = sta;
1650 acpi_device_get_busid(device);
1651 acpi_set_pnp_ids(handle, &device->pnp, type);
1652 acpi_bus_get_flags(device);
1653 device->flags.match_driver = false;
1654 device_initialize(&device->dev);
1655 dev_set_uevent_suppress(&device->dev, true);
1656 }
1657
1658 void acpi_device_add_finalize(struct acpi_device *device)
1659 {
1660 device->flags.match_driver = true;
1661 dev_set_uevent_suppress(&device->dev, false);
1662 kobject_uevent(&device->dev.kobj, KOBJ_ADD);
1663 }
1664
1665 static int acpi_add_single_object(struct acpi_device **child,
1666 acpi_handle handle, int type,
1667 unsigned long long sta)
1668 {
1669 int result;
1670 struct acpi_device *device;
1671 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
1672
1673 device = kzalloc(sizeof(struct acpi_device), GFP_KERNEL);
1674 if (!device) {
1675 printk(KERN_ERR PREFIX "Memory allocation error\n");
1676 return -ENOMEM;
1677 }
1678
1679 acpi_init_device_object(device, handle, type, sta);
1680 acpi_bus_get_power_flags(device);
1681 acpi_bus_get_wakeup_device_flags(device);
1682
1683 result = acpi_device_add(device, acpi_device_release);
1684 if (result) {
1685 acpi_device_release(&device->dev);
1686 return result;
1687 }
1688
1689 acpi_power_add_remove_device(device, true);
1690 acpi_device_add_finalize(device);
1691 acpi_get_name(handle, ACPI_FULL_PATHNAME, &buffer);
1692 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Added %s [%s] parent %s\n",
1693 dev_name(&device->dev), (char *) buffer.pointer,
1694 device->parent ? dev_name(&device->parent->dev) : "(null)"));
1695 kfree(buffer.pointer);
1696 *child = device;
1697 return 0;
1698 }
1699
1700 static int acpi_bus_type_and_status(acpi_handle handle, int *type,
1701 unsigned long long *sta)
1702 {
1703 acpi_status status;
1704 acpi_object_type acpi_type;
1705
1706 status = acpi_get_type(handle, &acpi_type);
1707 if (ACPI_FAILURE(status))
1708 return -ENODEV;
1709
1710 switch (acpi_type) {
1711 case ACPI_TYPE_ANY: /* for ACPI_ROOT_OBJECT */
1712 case ACPI_TYPE_DEVICE:
1713 *type = ACPI_BUS_TYPE_DEVICE;
1714 status = acpi_bus_get_status_handle(handle, sta);
1715 if (ACPI_FAILURE(status))
1716 return -ENODEV;
1717 break;
1718 case ACPI_TYPE_PROCESSOR:
1719 *type = ACPI_BUS_TYPE_PROCESSOR;
1720 status = acpi_bus_get_status_handle(handle, sta);
1721 if (ACPI_FAILURE(status))
1722 return -ENODEV;
1723 break;
1724 case ACPI_TYPE_THERMAL:
1725 *type = ACPI_BUS_TYPE_THERMAL;
1726 *sta = ACPI_STA_DEFAULT;
1727 break;
1728 case ACPI_TYPE_POWER:
1729 *type = ACPI_BUS_TYPE_POWER;
1730 *sta = ACPI_STA_DEFAULT;
1731 break;
1732 default:
1733 return -ENODEV;
1734 }
1735
1736 return 0;
1737 }
1738
1739 static bool acpi_scan_handler_matching(struct acpi_scan_handler *handler,
1740 char *idstr,
1741 const struct acpi_device_id **matchid)
1742 {
1743 const struct acpi_device_id *devid;
1744
1745 for (devid = handler->ids; devid->id[0]; devid++)
1746 if (!strcmp((char *)devid->id, idstr)) {
1747 if (matchid)
1748 *matchid = devid;
1749
1750 return true;
1751 }
1752
1753 return false;
1754 }
1755
1756 static struct acpi_scan_handler *acpi_scan_match_handler(char *idstr,
1757 const struct acpi_device_id **matchid)
1758 {
1759 struct acpi_scan_handler *handler;
1760
1761 list_for_each_entry(handler, &acpi_scan_handlers_list, list_node)
1762 if (acpi_scan_handler_matching(handler, idstr, matchid))
1763 return handler;
1764
1765 return NULL;
1766 }
1767
1768 void acpi_scan_hotplug_enabled(struct acpi_hotplug_profile *hotplug, bool val)
1769 {
1770 if (!!hotplug->enabled == !!val)
1771 return;
1772
1773 mutex_lock(&acpi_scan_lock);
1774
1775 hotplug->enabled = val;
1776
1777 mutex_unlock(&acpi_scan_lock);
1778 }
1779
1780 static void acpi_scan_init_hotplug(acpi_handle handle, int type)
1781 {
1782 struct acpi_device_pnp pnp = {};
1783 struct acpi_hardware_id *hwid;
1784 struct acpi_scan_handler *handler;
1785
1786 INIT_LIST_HEAD(&pnp.ids);
1787 acpi_set_pnp_ids(handle, &pnp, type);
1788
1789 if (!pnp.type.hardware_id)
1790 goto out;
1791
1792 /*
1793 * This relies on the fact that acpi_install_notify_handler() will not
1794 * install the same notify handler routine twice for the same handle.
1795 */
1796 list_for_each_entry(hwid, &pnp.ids, list) {
1797 handler = acpi_scan_match_handler(hwid->id, NULL);
1798 if (handler && !handler->hotplug.ignore) {
1799 acpi_install_notify_handler(handle, ACPI_SYSTEM_NOTIFY,
1800 acpi_hotplug_notify_cb, handler);
1801 break;
1802 }
1803 }
1804
1805 out:
1806 acpi_free_pnp_ids(&pnp);
1807 }
1808
1809 static acpi_status acpi_bus_check_add(acpi_handle handle, u32 lvl_not_used,
1810 void *not_used, void **return_value)
1811 {
1812 struct acpi_device *device = NULL;
1813 int type;
1814 unsigned long long sta;
1815 acpi_status status;
1816 int result;
1817
1818 acpi_bus_get_device(handle, &device);
1819 if (device)
1820 goto out;
1821
1822 result = acpi_bus_type_and_status(handle, &type, &sta);
1823 if (result)
1824 return AE_OK;
1825
1826 if (type == ACPI_BUS_TYPE_POWER) {
1827 acpi_add_power_resource(handle);
1828 return AE_OK;
1829 }
1830
1831 acpi_scan_init_hotplug(handle, type);
1832
1833 if (!(sta & ACPI_STA_DEVICE_PRESENT) &&
1834 !(sta & ACPI_STA_DEVICE_FUNCTIONING)) {
1835 struct acpi_device_wakeup wakeup;
1836 acpi_handle temp;
1837
1838 status = acpi_get_handle(handle, "_PRW", &temp);
1839 if (ACPI_SUCCESS(status)) {
1840 acpi_bus_extract_wakeup_device_power_package(handle,
1841 &wakeup);
1842 acpi_power_resources_list_free(&wakeup.resources);
1843 }
1844 return AE_CTRL_DEPTH;
1845 }
1846
1847 acpi_add_single_object(&device, handle, type, sta);
1848 if (!device)
1849 return AE_CTRL_DEPTH;
1850
1851 out:
1852 if (!*return_value)
1853 *return_value = device;
1854
1855 return AE_OK;
1856 }
1857
1858 static int acpi_scan_attach_handler(struct acpi_device *device)
1859 {
1860 struct acpi_hardware_id *hwid;
1861 int ret = 0;
1862
1863 list_for_each_entry(hwid, &device->pnp.ids, list) {
1864 const struct acpi_device_id *devid;
1865 struct acpi_scan_handler *handler;
1866
1867 handler = acpi_scan_match_handler(hwid->id, &devid);
1868 if (handler) {
1869 ret = handler->attach(device, devid);
1870 if (ret > 0) {
1871 device->handler = handler;
1872 break;
1873 } else if (ret < 0) {
1874 break;
1875 }
1876 }
1877 }
1878 return ret;
1879 }
1880
1881 static acpi_status acpi_bus_device_attach(acpi_handle handle, u32 lvl_not_used,
1882 void *not_used, void **ret_not_used)
1883 {
1884 struct acpi_device *device;
1885 unsigned long long sta_not_used;
1886 int ret;
1887
1888 /*
1889 * Ignore errors ignored by acpi_bus_check_add() to avoid terminating
1890 * namespace walks prematurely.
1891 */
1892 if (acpi_bus_type_and_status(handle, &ret, &sta_not_used))
1893 return AE_OK;
1894
1895 if (acpi_bus_get_device(handle, &device))
1896 return AE_CTRL_DEPTH;
1897
1898 if (device->handler)
1899 return AE_OK;
1900
1901 ret = acpi_scan_attach_handler(device);
1902 if (ret)
1903 return ret > 0 ? AE_OK : AE_CTRL_DEPTH;
1904
1905 ret = device_attach(&device->dev);
1906 return ret >= 0 ? AE_OK : AE_CTRL_DEPTH;
1907 }
1908
1909 /**
1910 * acpi_bus_scan - Add ACPI device node objects in a given namespace scope.
1911 * @handle: Root of the namespace scope to scan.
1912 *
1913 * Scan a given ACPI tree (probably recently hot-plugged) and create and add
1914 * found devices.
1915 *
1916 * If no devices were found, -ENODEV is returned, but it does not mean that
1917 * there has been a real error. There just have been no suitable ACPI objects
1918 * in the table trunk from which the kernel could create a device and add an
1919 * appropriate driver.
1920 *
1921 * Must be called under acpi_scan_lock.
1922 */
1923 int acpi_bus_scan(acpi_handle handle)
1924 {
1925 void *device = NULL;
1926 int error = 0;
1927
1928 if (ACPI_SUCCESS(acpi_bus_check_add(handle, 0, NULL, &device)))
1929 acpi_walk_namespace(ACPI_TYPE_ANY, handle, ACPI_UINT32_MAX,
1930 acpi_bus_check_add, NULL, NULL, &device);
1931
1932 if (!device)
1933 error = -ENODEV;
1934 else if (ACPI_SUCCESS(acpi_bus_device_attach(handle, 0, NULL, NULL)))
1935 acpi_walk_namespace(ACPI_TYPE_ANY, handle, ACPI_UINT32_MAX,
1936 acpi_bus_device_attach, NULL, NULL, NULL);
1937
1938 return error;
1939 }
1940 EXPORT_SYMBOL(acpi_bus_scan);
1941
1942 static acpi_status acpi_bus_device_detach(acpi_handle handle, u32 lvl_not_used,
1943 void *not_used, void **ret_not_used)
1944 {
1945 struct acpi_device *device = NULL;
1946
1947 if (!acpi_bus_get_device(handle, &device)) {
1948 struct acpi_scan_handler *dev_handler = device->handler;
1949
1950 device->removal_type = ACPI_BUS_REMOVAL_EJECT;
1951 if (dev_handler) {
1952 if (dev_handler->detach)
1953 dev_handler->detach(device);
1954
1955 device->handler = NULL;
1956 } else {
1957 device_release_driver(&device->dev);
1958 }
1959 }
1960 return AE_OK;
1961 }
1962
1963 static acpi_status acpi_bus_remove(acpi_handle handle, u32 lvl_not_used,
1964 void *not_used, void **ret_not_used)
1965 {
1966 struct acpi_device *device = NULL;
1967
1968 if (!acpi_bus_get_device(handle, &device))
1969 acpi_device_unregister(device);
1970
1971 return AE_OK;
1972 }
1973
1974 /**
1975 * acpi_bus_trim - Remove ACPI device node and all of its descendants
1976 * @start: Root of the ACPI device nodes subtree to remove.
1977 *
1978 * Must be called under acpi_scan_lock.
1979 */
1980 void acpi_bus_trim(struct acpi_device *start)
1981 {
1982 /*
1983 * Execute acpi_bus_device_detach() as a post-order callback to detach
1984 * all ACPI drivers from the device nodes being removed.
1985 */
1986 acpi_walk_namespace(ACPI_TYPE_ANY, start->handle, ACPI_UINT32_MAX, NULL,
1987 acpi_bus_device_detach, NULL, NULL);
1988 acpi_bus_device_detach(start->handle, 0, NULL, NULL);
1989 /*
1990 * Execute acpi_bus_remove() as a post-order callback to remove device
1991 * nodes in the given namespace scope.
1992 */
1993 acpi_walk_namespace(ACPI_TYPE_ANY, start->handle, ACPI_UINT32_MAX, NULL,
1994 acpi_bus_remove, NULL, NULL);
1995 acpi_bus_remove(start->handle, 0, NULL, NULL);
1996 }
1997 EXPORT_SYMBOL_GPL(acpi_bus_trim);
1998
1999 static int acpi_bus_scan_fixed(void)
2000 {
2001 int result = 0;
2002
2003 /*
2004 * Enumerate all fixed-feature devices.
2005 */
2006 if (!(acpi_gbl_FADT.flags & ACPI_FADT_POWER_BUTTON)) {
2007 struct acpi_device *device = NULL;
2008
2009 result = acpi_add_single_object(&device, NULL,
2010 ACPI_BUS_TYPE_POWER_BUTTON,
2011 ACPI_STA_DEFAULT);
2012 if (result)
2013 return result;
2014
2015 result = device_attach(&device->dev);
2016 if (result < 0)
2017 return result;
2018
2019 device_init_wakeup(&device->dev, true);
2020 }
2021
2022 if (!(acpi_gbl_FADT.flags & ACPI_FADT_SLEEP_BUTTON)) {
2023 struct acpi_device *device = NULL;
2024
2025 result = acpi_add_single_object(&device, NULL,
2026 ACPI_BUS_TYPE_SLEEP_BUTTON,
2027 ACPI_STA_DEFAULT);
2028 if (result)
2029 return result;
2030
2031 result = device_attach(&device->dev);
2032 }
2033
2034 return result < 0 ? result : 0;
2035 }
2036
2037 int __init acpi_scan_init(void)
2038 {
2039 int result;
2040
2041 result = bus_register(&acpi_bus_type);
2042 if (result) {
2043 /* We don't want to quit even if we failed to add suspend/resume */
2044 printk(KERN_ERR PREFIX "Could not register bus type\n");
2045 }
2046
2047 acpi_pci_root_init();
2048 acpi_pci_link_init();
2049 acpi_platform_init();
2050 acpi_lpss_init();
2051 acpi_cmos_rtc_init();
2052 acpi_container_init();
2053 acpi_memory_hotplug_init();
2054 acpi_dock_init();
2055
2056 mutex_lock(&acpi_scan_lock);
2057 /*
2058 * Enumerate devices in the ACPI namespace.
2059 */
2060 result = acpi_bus_scan(ACPI_ROOT_OBJECT);
2061 if (result)
2062 goto out;
2063
2064 result = acpi_bus_get_device(ACPI_ROOT_OBJECT, &acpi_root);
2065 if (result)
2066 goto out;
2067
2068 result = acpi_bus_scan_fixed();
2069 if (result) {
2070 acpi_device_unregister(acpi_root);
2071 goto out;
2072 }
2073
2074 acpi_update_all_gpes();
2075
2076 acpi_pci_root_hp_init();
2077
2078 out:
2079 mutex_unlock(&acpi_scan_lock);
2080 return result;
2081 }
kernel source for telekom puls (alcatel/mediatek)