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usbnet: do not pretend to support SG/TSO
[linux/fpc-iii.git] / drivers / acpi / scan.c
blob10985573aaa7c680613c1412c958d81d7af22f64
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 /*
31 * If set, devices will be hot-removed even if they cannot be put offline
32 * gracefully (from the kernel's standpoint).
33 */
34 bool acpi_force_hot_remove;
35
36 static const char *dummy_hid = "device";
37
38 static LIST_HEAD(acpi_bus_id_list);
39 static DEFINE_MUTEX(acpi_scan_lock);
40 static LIST_HEAD(acpi_scan_handlers_list);
41 DEFINE_MUTEX(acpi_device_lock);
42 LIST_HEAD(acpi_wakeup_device_list);
43
44 struct acpi_device_bus_id{
45 char bus_id[15];
46 unsigned int instance_no;
47 struct list_head node;
48 };
49
50 void acpi_scan_lock_acquire(void)
51 {
52 mutex_lock(&acpi_scan_lock);
53 }
54 EXPORT_SYMBOL_GPL(acpi_scan_lock_acquire);
55
56 void acpi_scan_lock_release(void)
57 {
58 mutex_unlock(&acpi_scan_lock);
59 }
60 EXPORT_SYMBOL_GPL(acpi_scan_lock_release);
61
62 int acpi_scan_add_handler(struct acpi_scan_handler *handler)
63 {
64 if (!handler || !handler->attach)
65 return -EINVAL;
66
67 list_add_tail(&handler->list_node, &acpi_scan_handlers_list);
68 return 0;
69 }
70
71 int acpi_scan_add_handler_with_hotplug(struct acpi_scan_handler *handler,
72 const char *hotplug_profile_name)
73 {
74 int error;
75
76 error = acpi_scan_add_handler(handler);
77 if (error)
78 return error;
79
80 acpi_sysfs_add_hotplug_profile(&handler->hotplug, hotplug_profile_name);
81 return 0;
82 }
83
84 /*
85 * Creates hid/cid(s) string needed for modalias and uevent
86 * e.g. on a device with hid:IBM0001 and cid:ACPI0001 you get:
87 * char *modalias: "acpi:IBM0001:ACPI0001"
88 */
89 static int create_modalias(struct acpi_device *acpi_dev, char *modalias,
90 int size)
91 {
92 int len;
93 int count;
94 struct acpi_hardware_id *id;
95
96 if (list_empty(&acpi_dev->pnp.ids))
97 return 0;
98
99 len = snprintf(modalias, size, "acpi:");
100 size -= len;
101
102 list_for_each_entry(id, &acpi_dev->pnp.ids, list) {
103 count = snprintf(&modalias[len], size, "%s:", id->id);
104 if (count < 0 || count >= size)
105 return -EINVAL;
106 len += count;
107 size -= count;
108 }
109
110 modalias[len] = '\0';
111 return len;
112 }
113
114 static ssize_t
115 acpi_device_modalias_show(struct device *dev, struct device_attribute *attr, char *buf) {
116 struct acpi_device *acpi_dev = to_acpi_device(dev);
117 int len;
118
119 /* Device has no HID and no CID or string is >1024 */
120 len = create_modalias(acpi_dev, buf, 1024);
121 if (len <= 0)
122 return 0;
123 buf[len++] = '\n';
124 return len;
125 }
126 static DEVICE_ATTR(modalias, 0444, acpi_device_modalias_show, NULL);
127
128 static acpi_status acpi_bus_offline_companions(acpi_handle handle, u32 lvl,
129 void *data, void **ret_p)
130 {
131 struct acpi_device *device = NULL;
132 struct acpi_device_physical_node *pn;
133 bool second_pass = (bool)data;
134 acpi_status status = AE_OK;
135
136 if (acpi_bus_get_device(handle, &device))
137 return AE_OK;
138
139 mutex_lock(&device->physical_node_lock);
140
141 list_for_each_entry(pn, &device->physical_node_list, node) {
142 int ret;
143
144 if (second_pass) {
145 /* Skip devices offlined by the first pass. */
146 if (pn->put_online)
147 continue;
148 } else {
149 pn->put_online = false;
150 }
151 ret = device_offline(pn->dev);
152 if (acpi_force_hot_remove)
153 continue;
154
155 if (ret >= 0) {
156 pn->put_online = !ret;
157 } else {
158 *ret_p = pn->dev;
159 if (second_pass) {
160 status = AE_ERROR;
161 break;
162 }
163 }
164 }
165
166 mutex_unlock(&device->physical_node_lock);
167
168 return status;
169 }
170
171 static acpi_status acpi_bus_online_companions(acpi_handle handle, u32 lvl,
172 void *data, void **ret_p)
173 {
174 struct acpi_device *device = NULL;
175 struct acpi_device_physical_node *pn;
176
177 if (acpi_bus_get_device(handle, &device))
178 return AE_OK;
179
180 mutex_lock(&device->physical_node_lock);
181
182 list_for_each_entry(pn, &device->physical_node_list, node)
183 if (pn->put_online) {
184 device_online(pn->dev);
185 pn->put_online = false;
186 }
187
188 mutex_unlock(&device->physical_node_lock);
189
190 return AE_OK;
191 }
192
193 static int acpi_scan_hot_remove(struct acpi_device *device)
194 {
195 acpi_handle handle = device->handle;
196 acpi_handle not_used;
197 struct acpi_object_list arg_list;
198 union acpi_object arg;
199 struct device *errdev;
200 acpi_status status;
201 unsigned long long sta;
202
203 /* If there is no handle, the device node has been unregistered. */
204 if (!handle) {
205 dev_dbg(&device->dev, "ACPI handle missing\n");
206 put_device(&device->dev);
207 return -EINVAL;
208 }
209
210 lock_device_hotplug();
211
212 /*
213 * Carry out two passes here and ignore errors in the first pass,
214 * because if the devices in question are memory blocks and
215 * CONFIG_MEMCG is set, one of the blocks may hold data structures
216 * that the other blocks depend on, but it is not known in advance which
217 * block holds them.
218 *
219 * If the first pass is successful, the second one isn't needed, though.
220 */
221 errdev = NULL;
222 acpi_walk_namespace(ACPI_TYPE_ANY, handle, ACPI_UINT32_MAX,
223 NULL, acpi_bus_offline_companions,
224 (void *)false, (void **)&errdev);
225 acpi_bus_offline_companions(handle, 0, (void *)false, (void **)&errdev);
226 if (errdev) {
227 errdev = NULL;
228 acpi_walk_namespace(ACPI_TYPE_ANY, handle, ACPI_UINT32_MAX,
229 NULL, acpi_bus_offline_companions,
230 (void *)true , (void **)&errdev);
231 if (!errdev || acpi_force_hot_remove)
232 acpi_bus_offline_companions(handle, 0, (void *)true,
233 (void **)&errdev);
234
235 if (errdev && !acpi_force_hot_remove) {
236 dev_warn(errdev, "Offline failed.\n");
237 acpi_bus_online_companions(handle, 0, NULL, NULL);
238 acpi_walk_namespace(ACPI_TYPE_ANY, handle,
239 ACPI_UINT32_MAX,
240 acpi_bus_online_companions, NULL,
241 NULL, NULL);
242
243 unlock_device_hotplug();
244
245 put_device(&device->dev);
246 return -EBUSY;
247 }
248 }
249
250 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
251 "Hot-removing device %s...\n", dev_name(&device->dev)));
252
253 acpi_bus_trim(device);
254
255 unlock_device_hotplug();
256
257 /* Device node has been unregistered. */
258 put_device(&device->dev);
259 device = NULL;
260
261 if (ACPI_SUCCESS(acpi_get_handle(handle, "_LCK", &not_used))) {
262 arg_list.count = 1;
263 arg_list.pointer = &arg;
264 arg.type = ACPI_TYPE_INTEGER;
265 arg.integer.value = 0;
266 acpi_evaluate_object(handle, "_LCK", &arg_list, NULL);
267 }
268
269 arg_list.count = 1;
270 arg_list.pointer = &arg;
271 arg.type = ACPI_TYPE_INTEGER;
272 arg.integer.value = 1;
273
274 /*
275 * TBD: _EJD support.
276 */
277 status = acpi_evaluate_object(handle, "_EJ0", &arg_list, NULL);
278 if (ACPI_FAILURE(status)) {
279 if (status == AE_NOT_FOUND) {
280 return -ENODEV;
281 } else {
282 acpi_handle_warn(handle, "Eject failed (0x%x)\n",
283 status);
284 return -EIO;
285 }
286 }
287
288 /*
289 * Verify if eject was indeed successful. If not, log an error
290 * message. No need to call _OST since _EJ0 call was made OK.
291 */
292 status = acpi_evaluate_integer(handle, "_STA", NULL, &sta);
293 if (ACPI_FAILURE(status)) {
294 acpi_handle_warn(handle,
295 "Status check after eject failed (0x%x)\n", status);
296 } else if (sta & ACPI_STA_DEVICE_ENABLED) {
297 acpi_handle_warn(handle,
298 "Eject incomplete - status 0x%llx\n", sta);
299 }
300
301 return 0;
302 }
303
304 static void acpi_bus_device_eject(void *context)
305 {
306 acpi_handle handle = context;
307 struct acpi_device *device = NULL;
308 struct acpi_scan_handler *handler;
309 u32 ost_code = ACPI_OST_SC_NON_SPECIFIC_FAILURE;
310
311 mutex_lock(&acpi_scan_lock);
312
313 acpi_bus_get_device(handle, &device);
314 if (!device)
315 goto err_out;
316
317 handler = device->handler;
318 if (!handler || !handler->hotplug.enabled) {
319 ost_code = ACPI_OST_SC_EJECT_NOT_SUPPORTED;
320 goto err_out;
321 }
322 acpi_evaluate_hotplug_ost(handle, ACPI_NOTIFY_EJECT_REQUEST,
323 ACPI_OST_SC_EJECT_IN_PROGRESS, NULL);
324 if (handler->hotplug.mode == AHM_CONTAINER) {
325 device->flags.eject_pending = true;
326 kobject_uevent(&device->dev.kobj, KOBJ_OFFLINE);
327 } else {
328 int error;
329
330 get_device(&device->dev);
331 error = acpi_scan_hot_remove(device);
332 if (error)
333 goto err_out;
334 }
335
336 out:
337 mutex_unlock(&acpi_scan_lock);
338 return;
339
340 err_out:
341 acpi_evaluate_hotplug_ost(handle, ACPI_NOTIFY_EJECT_REQUEST, ost_code,
342 NULL);
343 goto out;
344 }
345
346 static void acpi_scan_bus_device_check(acpi_handle handle, u32 ost_source)
347 {
348 struct acpi_device *device = NULL;
349 u32 ost_code = ACPI_OST_SC_NON_SPECIFIC_FAILURE;
350 int error;
351
352 mutex_lock(&acpi_scan_lock);
353 lock_device_hotplug();
354
355 acpi_bus_get_device(handle, &device);
356 if (device) {
357 dev_warn(&device->dev, "Attempt to re-insert\n");
358 goto out;
359 }
360 acpi_evaluate_hotplug_ost(handle, ost_source,
361 ACPI_OST_SC_INSERT_IN_PROGRESS, NULL);
362 error = acpi_bus_scan(handle);
363 if (error) {
364 acpi_handle_warn(handle, "Namespace scan failure\n");
365 goto out;
366 }
367 error = acpi_bus_get_device(handle, &device);
368 if (error) {
369 acpi_handle_warn(handle, "Missing device node object\n");
370 goto out;
371 }
372 ost_code = ACPI_OST_SC_SUCCESS;
373 if (device->handler && device->handler->hotplug.mode == AHM_CONTAINER)
374 kobject_uevent(&device->dev.kobj, KOBJ_ONLINE);
375
376 out:
377 unlock_device_hotplug();
378 acpi_evaluate_hotplug_ost(handle, ost_source, ost_code, NULL);
379 mutex_unlock(&acpi_scan_lock);
380 }
381
382 static void acpi_scan_bus_check(void *context)
383 {
384 acpi_scan_bus_device_check((acpi_handle)context,
385 ACPI_NOTIFY_BUS_CHECK);
386 }
387
388 static void acpi_scan_device_check(void *context)
389 {
390 acpi_scan_bus_device_check((acpi_handle)context,
391 ACPI_NOTIFY_DEVICE_CHECK);
392 }
393
394 static void acpi_hotplug_unsupported(acpi_handle handle, u32 type)
395 {
396 u32 ost_status;
397
398 switch (type) {
399 case ACPI_NOTIFY_BUS_CHECK:
400 acpi_handle_debug(handle,
401 "ACPI_NOTIFY_BUS_CHECK event: unsupported\n");
402 ost_status = ACPI_OST_SC_INSERT_NOT_SUPPORTED;
403 break;
404 case ACPI_NOTIFY_DEVICE_CHECK:
405 acpi_handle_debug(handle,
406 "ACPI_NOTIFY_DEVICE_CHECK event: unsupported\n");
407 ost_status = ACPI_OST_SC_INSERT_NOT_SUPPORTED;
408 break;
409 case ACPI_NOTIFY_EJECT_REQUEST:
410 acpi_handle_debug(handle,
411 "ACPI_NOTIFY_EJECT_REQUEST event: unsupported\n");
412 ost_status = ACPI_OST_SC_EJECT_NOT_SUPPORTED;
413 break;
414 default:
415 /* non-hotplug event; possibly handled by other handler */
416 return;
417 }
418
419 acpi_evaluate_hotplug_ost(handle, type, ost_status, NULL);
420 }
421
422 static void acpi_hotplug_notify_cb(acpi_handle handle, u32 type, void *data)
423 {
424 acpi_osd_exec_callback callback;
425 struct acpi_scan_handler *handler = data;
426 acpi_status status;
427
428 if (!handler->hotplug.enabled)
429 return acpi_hotplug_unsupported(handle, type);
430
431 switch (type) {
432 case ACPI_NOTIFY_BUS_CHECK:
433 acpi_handle_debug(handle, "ACPI_NOTIFY_BUS_CHECK event\n");
434 callback = acpi_scan_bus_check;
435 break;
436 case ACPI_NOTIFY_DEVICE_CHECK:
437 acpi_handle_debug(handle, "ACPI_NOTIFY_DEVICE_CHECK event\n");
438 callback = acpi_scan_device_check;
439 break;
440 case ACPI_NOTIFY_EJECT_REQUEST:
441 acpi_handle_debug(handle, "ACPI_NOTIFY_EJECT_REQUEST event\n");
442 callback = acpi_bus_device_eject;
443 break;
444 default:
445 /* non-hotplug event; possibly handled by other handler */
446 return;
447 }
448 status = acpi_os_hotplug_execute(callback, handle);
449 if (ACPI_FAILURE(status))
450 acpi_evaluate_hotplug_ost(handle, type,
451 ACPI_OST_SC_NON_SPECIFIC_FAILURE,
452 NULL);
453 }
454
455 /**
456 * acpi_bus_hot_remove_device: hot-remove a device and its children
457 * @context: struct acpi_eject_event pointer (freed in this func)
458 *
459 * Hot-remove a device and its children. This function frees up the
460 * memory space passed by arg context, so that the caller may call
461 * this function asynchronously through acpi_os_hotplug_execute().
462 */
463 void acpi_bus_hot_remove_device(void *context)
464 {
465 struct acpi_eject_event *ej_event = context;
466 struct acpi_device *device = ej_event->device;
467 acpi_handle handle = device->handle;
468 int error;
469
470 mutex_lock(&acpi_scan_lock);
471
472 error = acpi_scan_hot_remove(device);
473 if (error && handle)
474 acpi_evaluate_hotplug_ost(handle, ej_event->event,
475 ACPI_OST_SC_NON_SPECIFIC_FAILURE,
476 NULL);
477
478 mutex_unlock(&acpi_scan_lock);
479 kfree(context);
480 }
481 EXPORT_SYMBOL(acpi_bus_hot_remove_device);
482
483 static ssize_t real_power_state_show(struct device *dev,
484 struct device_attribute *attr, char *buf)
485 {
486 struct acpi_device *adev = to_acpi_device(dev);
487 int state;
488 int ret;
489
490 ret = acpi_device_get_power(adev, &state);
491 if (ret)
492 return ret;
493
494 return sprintf(buf, "%s\n", acpi_power_state_string(state));
495 }
496
497 static DEVICE_ATTR(real_power_state, 0444, real_power_state_show, NULL);
498
499 static ssize_t power_state_show(struct device *dev,
500 struct device_attribute *attr, char *buf)
501 {
502 struct acpi_device *adev = to_acpi_device(dev);
503
504 return sprintf(buf, "%s\n", acpi_power_state_string(adev->power.state));
505 }
506
507 static DEVICE_ATTR(power_state, 0444, power_state_show, NULL);
508
509 static ssize_t
510 acpi_eject_store(struct device *d, struct device_attribute *attr,
511 const char *buf, size_t count)
512 {
513 struct acpi_device *acpi_device = to_acpi_device(d);
514 struct acpi_eject_event *ej_event;
515 acpi_object_type not_used;
516 acpi_status status;
517 u32 ost_source;
518 int ret;
519
520 if (!count || buf[0] != '1')
521 return -EINVAL;
522
523 if ((!acpi_device->handler || !acpi_device->handler->hotplug.enabled)
524 && !acpi_device->driver)
525 return -ENODEV;
526
527 status = acpi_get_type(acpi_device->handle, &not_used);
528 if (ACPI_FAILURE(status) || !acpi_device->flags.ejectable)
529 return -ENODEV;
530
531 mutex_lock(&acpi_scan_lock);
532
533 if (acpi_device->flags.eject_pending) {
534 /* ACPI eject notification event. */
535 ost_source = ACPI_NOTIFY_EJECT_REQUEST;
536 acpi_device->flags.eject_pending = 0;
537 } else {
538 /* Eject initiated by user space. */
539 ost_source = ACPI_OST_EC_OSPM_EJECT;
540 }
541 ej_event = kmalloc(sizeof(*ej_event), GFP_KERNEL);
542 if (!ej_event) {
543 ret = -ENOMEM;
544 goto err_out;
545 }
546 acpi_evaluate_hotplug_ost(acpi_device->handle, ost_source,
547 ACPI_OST_SC_EJECT_IN_PROGRESS, NULL);
548 ej_event->device = acpi_device;
549 ej_event->event = ost_source;
550 get_device(&acpi_device->dev);
551 status = acpi_os_hotplug_execute(acpi_bus_hot_remove_device, ej_event);
552 if (ACPI_FAILURE(status)) {
553 put_device(&acpi_device->dev);
554 kfree(ej_event);
555 ret = status == AE_NO_MEMORY ? -ENOMEM : -EAGAIN;
556 goto err_out;
557 }
558 ret = count;
559
560 out:
561 mutex_unlock(&acpi_scan_lock);
562 return ret;
563
564 err_out:
565 acpi_evaluate_hotplug_ost(acpi_device->handle, ost_source,
566 ACPI_OST_SC_NON_SPECIFIC_FAILURE, NULL);
567 goto out;
568 }
569
570 static DEVICE_ATTR(eject, 0200, NULL, acpi_eject_store);
571
572 static ssize_t
573 acpi_device_hid_show(struct device *dev, struct device_attribute *attr, char *buf) {
574 struct acpi_device *acpi_dev = to_acpi_device(dev);
575
576 return sprintf(buf, "%s\n", acpi_device_hid(acpi_dev));
577 }
578 static DEVICE_ATTR(hid, 0444, acpi_device_hid_show, NULL);
579
580 static ssize_t acpi_device_uid_show(struct device *dev,
581 struct device_attribute *attr, char *buf)
582 {
583 struct acpi_device *acpi_dev = to_acpi_device(dev);
584
585 return sprintf(buf, "%s\n", acpi_dev->pnp.unique_id);
586 }
587 static DEVICE_ATTR(uid, 0444, acpi_device_uid_show, NULL);
588
589 static ssize_t acpi_device_adr_show(struct device *dev,
590 struct device_attribute *attr, char *buf)
591 {
592 struct acpi_device *acpi_dev = to_acpi_device(dev);
593
594 return sprintf(buf, "0x%08x\n",
595 (unsigned int)(acpi_dev->pnp.bus_address));
596 }
597 static DEVICE_ATTR(adr, 0444, acpi_device_adr_show, NULL);
598
599 static ssize_t
600 acpi_device_path_show(struct device *dev, struct device_attribute *attr, char *buf) {
601 struct acpi_device *acpi_dev = to_acpi_device(dev);
602 struct acpi_buffer path = {ACPI_ALLOCATE_BUFFER, NULL};
603 int result;
604
605 result = acpi_get_name(acpi_dev->handle, ACPI_FULL_PATHNAME, &path);
606 if (result)
607 goto end;
608
609 result = sprintf(buf, "%s\n", (char*)path.pointer);
610 kfree(path.pointer);
611 end:
612 return result;
613 }
614 static DEVICE_ATTR(path, 0444, acpi_device_path_show, NULL);
615
616 /* sysfs file that shows description text from the ACPI _STR method */
617 static ssize_t description_show(struct device *dev,
618 struct device_attribute *attr,
619 char *buf) {
620 struct acpi_device *acpi_dev = to_acpi_device(dev);
621 int result;
622
623 if (acpi_dev->pnp.str_obj == NULL)
624 return 0;
625
626 /*
627 * The _STR object contains a Unicode identifier for a device.
628 * We need to convert to utf-8 so it can be displayed.
629 */
630 result = utf16s_to_utf8s(
631 (wchar_t *)acpi_dev->pnp.str_obj->buffer.pointer,
632 acpi_dev->pnp.str_obj->buffer.length,
633 UTF16_LITTLE_ENDIAN, buf,
634 PAGE_SIZE);
635
636 buf[result++] = '\n';
637
638 return result;
639 }
640 static DEVICE_ATTR(description, 0444, description_show, NULL);
641
642 static ssize_t
643 acpi_device_sun_show(struct device *dev, struct device_attribute *attr,
644 char *buf) {
645 struct acpi_device *acpi_dev = to_acpi_device(dev);
646
647 return sprintf(buf, "%lu\n", acpi_dev->pnp.sun);
648 }
649 static DEVICE_ATTR(sun, 0444, acpi_device_sun_show, NULL);
650
651 static int acpi_device_setup_files(struct acpi_device *dev)
652 {
653 struct acpi_buffer buffer = {ACPI_ALLOCATE_BUFFER, NULL};
654 acpi_status status;
655 acpi_handle temp;
656 unsigned long long sun;
657 int result = 0;
658
659 /*
660 * Devices gotten from FADT don't have a "path" attribute
661 */
662 if (dev->handle) {
663 result = device_create_file(&dev->dev, &dev_attr_path);
664 if (result)
665 goto end;
666 }
667
668 if (!list_empty(&dev->pnp.ids)) {
669 result = device_create_file(&dev->dev, &dev_attr_hid);
670 if (result)
671 goto end;
672
673 result = device_create_file(&dev->dev, &dev_attr_modalias);
674 if (result)
675 goto end;
676 }
677
678 /*
679 * If device has _STR, 'description' file is created
680 */
681 status = acpi_get_handle(dev->handle, "_STR", &temp);
682 if (ACPI_SUCCESS(status)) {
683 status = acpi_evaluate_object(dev->handle, "_STR",
684 NULL, &buffer);
685 if (ACPI_FAILURE(status))
686 buffer.pointer = NULL;
687 dev->pnp.str_obj = buffer.pointer;
688 result = device_create_file(&dev->dev, &dev_attr_description);
689 if (result)
690 goto end;
691 }
692
693 if (dev->pnp.type.bus_address)
694 result = device_create_file(&dev->dev, &dev_attr_adr);
695 if (dev->pnp.unique_id)
696 result = device_create_file(&dev->dev, &dev_attr_uid);
697
698 status = acpi_evaluate_integer(dev->handle, "_SUN", NULL, &sun);
699 if (ACPI_SUCCESS(status)) {
700 dev->pnp.sun = (unsigned long)sun;
701 result = device_create_file(&dev->dev, &dev_attr_sun);
702 if (result)
703 goto end;
704 } else {
705 dev->pnp.sun = (unsigned long)-1;
706 }
707
708 /*
709 * If device has _EJ0, 'eject' file is created that is used to trigger
710 * hot-removal function from userland.
711 */
712 status = acpi_get_handle(dev->handle, "_EJ0", &temp);
713 if (ACPI_SUCCESS(status)) {
714 result = device_create_file(&dev->dev, &dev_attr_eject);
715 if (result)
716 return result;
717 }
718
719 if (dev->flags.power_manageable) {
720 result = device_create_file(&dev->dev, &dev_attr_power_state);
721 if (result)
722 return result;
723
724 if (dev->power.flags.power_resources)
725 result = device_create_file(&dev->dev,
726 &dev_attr_real_power_state);
727 }
728
729 end:
730 return result;
731 }
732
733 static void acpi_device_remove_files(struct acpi_device *dev)
734 {
735 acpi_status status;
736 acpi_handle temp;
737
738 if (dev->flags.power_manageable) {
739 device_remove_file(&dev->dev, &dev_attr_power_state);
740 if (dev->power.flags.power_resources)
741 device_remove_file(&dev->dev,
742 &dev_attr_real_power_state);
743 }
744
745 /*
746 * If device has _STR, remove 'description' file
747 */
748 status = acpi_get_handle(dev->handle, "_STR", &temp);
749 if (ACPI_SUCCESS(status)) {
750 kfree(dev->pnp.str_obj);
751 device_remove_file(&dev->dev, &dev_attr_description);
752 }
753 /*
754 * If device has _EJ0, remove 'eject' file.
755 */
756 status = acpi_get_handle(dev->handle, "_EJ0", &temp);
757 if (ACPI_SUCCESS(status))
758 device_remove_file(&dev->dev, &dev_attr_eject);
759
760 status = acpi_get_handle(dev->handle, "_SUN", &temp);
761 if (ACPI_SUCCESS(status))
762 device_remove_file(&dev->dev, &dev_attr_sun);
763
764 if (dev->pnp.unique_id)
765 device_remove_file(&dev->dev, &dev_attr_uid);
766 if (dev->pnp.type.bus_address)
767 device_remove_file(&dev->dev, &dev_attr_adr);
768 device_remove_file(&dev->dev, &dev_attr_modalias);
769 device_remove_file(&dev->dev, &dev_attr_hid);
770 if (dev->handle)
771 device_remove_file(&dev->dev, &dev_attr_path);
772 }
773 /* --------------------------------------------------------------------------
774 ACPI Bus operations
775 -------------------------------------------------------------------------- */
776
777 static const struct acpi_device_id *__acpi_match_device(
778 struct acpi_device *device, const struct acpi_device_id *ids)
779 {
780 const struct acpi_device_id *id;
781 struct acpi_hardware_id *hwid;
782
783 /*
784 * If the device is not present, it is unnecessary to load device
785 * driver for it.
786 */
787 if (!device->status.present)
788 return NULL;
789
790 for (id = ids; id->id[0]; id++)
791 list_for_each_entry(hwid, &device->pnp.ids, list)
792 if (!strcmp((char *) id->id, hwid->id))
793 return id;
794
795 return NULL;
796 }
797
798 /**
799 * acpi_match_device - Match a struct device against a given list of ACPI IDs
800 * @ids: Array of struct acpi_device_id object to match against.
801 * @dev: The device structure to match.
802 *
803 * Check if @dev has a valid ACPI handle and if there is a struct acpi_device
804 * object for that handle and use that object to match against a given list of
805 * device IDs.
806 *
807 * Return a pointer to the first matching ID on success or %NULL on failure.
808 */
809 const struct acpi_device_id *acpi_match_device(const struct acpi_device_id *ids,
810 const struct device *dev)
811 {
812 struct acpi_device *adev;
813 acpi_handle handle = ACPI_HANDLE(dev);
814
815 if (!ids || !handle || acpi_bus_get_device(handle, &adev))
816 return NULL;
817
818 return __acpi_match_device(adev, ids);
819 }
820 EXPORT_SYMBOL_GPL(acpi_match_device);
821
822 int acpi_match_device_ids(struct acpi_device *device,
823 const struct acpi_device_id *ids)
824 {
825 return __acpi_match_device(device, ids) ? 0 : -ENOENT;
826 }
827 EXPORT_SYMBOL(acpi_match_device_ids);
828
829 static void acpi_free_power_resources_lists(struct acpi_device *device)
830 {
831 int i;
832
833 if (device->wakeup.flags.valid)
834 acpi_power_resources_list_free(&device->wakeup.resources);
835
836 if (!device->flags.power_manageable)
837 return;
838
839 for (i = ACPI_STATE_D0; i <= ACPI_STATE_D3_HOT; i++) {
840 struct acpi_device_power_state *ps = &device->power.states[i];
841 acpi_power_resources_list_free(&ps->resources);
842 }
843 }
844
845 static void acpi_device_release(struct device *dev)
846 {
847 struct acpi_device *acpi_dev = to_acpi_device(dev);
848
849 acpi_free_pnp_ids(&acpi_dev->pnp);
850 acpi_free_power_resources_lists(acpi_dev);
851 kfree(acpi_dev);
852 }
853
854 static int acpi_bus_match(struct device *dev, struct device_driver *drv)
855 {
856 struct acpi_device *acpi_dev = to_acpi_device(dev);
857 struct acpi_driver *acpi_drv = to_acpi_driver(drv);
858
859 return acpi_dev->flags.match_driver
860 && !acpi_match_device_ids(acpi_dev, acpi_drv->ids);
861 }
862
863 static int acpi_device_uevent(struct device *dev, struct kobj_uevent_env *env)
864 {
865 struct acpi_device *acpi_dev = to_acpi_device(dev);
866 int len;
867
868 if (list_empty(&acpi_dev->pnp.ids))
869 return 0;
870
871 if (add_uevent_var(env, "MODALIAS="))
872 return -ENOMEM;
873 len = create_modalias(acpi_dev, &env->buf[env->buflen - 1],
874 sizeof(env->buf) - env->buflen);
875 if (len >= (sizeof(env->buf) - env->buflen))
876 return -ENOMEM;
877 env->buflen += len;
878 return 0;
879 }
880
881 static void acpi_device_notify(acpi_handle handle, u32 event, void *data)
882 {
883 struct acpi_device *device = data;
884
885 device->driver->ops.notify(device, event);
886 }
887
888 static acpi_status acpi_device_notify_fixed(void *data)
889 {
890 struct acpi_device *device = data;
891
892 /* Fixed hardware devices have no handles */
893 acpi_device_notify(NULL, ACPI_FIXED_HARDWARE_EVENT, device);
894 return AE_OK;
895 }
896
897 static int acpi_device_install_notify_handler(struct acpi_device *device)
898 {
899 acpi_status status;
900
901 if (device->device_type == ACPI_BUS_TYPE_POWER_BUTTON)
902 status =
903 acpi_install_fixed_event_handler(ACPI_EVENT_POWER_BUTTON,
904 acpi_device_notify_fixed,
905 device);
906 else if (device->device_type == ACPI_BUS_TYPE_SLEEP_BUTTON)
907 status =
908 acpi_install_fixed_event_handler(ACPI_EVENT_SLEEP_BUTTON,
909 acpi_device_notify_fixed,
910 device);
911 else
912 status = acpi_install_notify_handler(device->handle,
913 ACPI_DEVICE_NOTIFY,
914 acpi_device_notify,
915 device);
916
917 if (ACPI_FAILURE(status))
918 return -EINVAL;
919 return 0;
920 }
921
922 static void acpi_device_remove_notify_handler(struct acpi_device *device)
923 {
924 if (device->device_type == ACPI_BUS_TYPE_POWER_BUTTON)
925 acpi_remove_fixed_event_handler(ACPI_EVENT_POWER_BUTTON,
926 acpi_device_notify_fixed);
927 else if (device->device_type == ACPI_BUS_TYPE_SLEEP_BUTTON)
928 acpi_remove_fixed_event_handler(ACPI_EVENT_SLEEP_BUTTON,
929 acpi_device_notify_fixed);
930 else
931 acpi_remove_notify_handler(device->handle, ACPI_DEVICE_NOTIFY,
932 acpi_device_notify);
933 }
934
935 static int acpi_device_probe(struct device *dev)
936 {
937 struct acpi_device *acpi_dev = to_acpi_device(dev);
938 struct acpi_driver *acpi_drv = to_acpi_driver(dev->driver);
939 int ret;
940
941 if (acpi_dev->handler)
942 return -EINVAL;
943
944 if (!acpi_drv->ops.add)
945 return -ENOSYS;
946
947 ret = acpi_drv->ops.add(acpi_dev);
948 if (ret)
949 return ret;
950
951 acpi_dev->driver = acpi_drv;
952 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
953 "Driver [%s] successfully bound to device [%s]\n",
954 acpi_drv->name, acpi_dev->pnp.bus_id));
955
956 if (acpi_drv->ops.notify) {
957 ret = acpi_device_install_notify_handler(acpi_dev);
958 if (ret) {
959 if (acpi_drv->ops.remove)
960 acpi_drv->ops.remove(acpi_dev);
961
962 acpi_dev->driver = NULL;
963 acpi_dev->driver_data = NULL;
964 return ret;
965 }
966 }
967
968 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found driver [%s] for device [%s]\n",
969 acpi_drv->name, acpi_dev->pnp.bus_id));
970 get_device(dev);
971 return 0;
972 }
973
974 static int acpi_device_remove(struct device * dev)
975 {
976 struct acpi_device *acpi_dev = to_acpi_device(dev);
977 struct acpi_driver *acpi_drv = acpi_dev->driver;
978
979 if (acpi_drv) {
980 if (acpi_drv->ops.notify)
981 acpi_device_remove_notify_handler(acpi_dev);
982 if (acpi_drv->ops.remove)
983 acpi_drv->ops.remove(acpi_dev);
984 }
985 acpi_dev->driver = NULL;
986 acpi_dev->driver_data = NULL;
987
988 put_device(dev);
989 return 0;
990 }
991
992 struct bus_type acpi_bus_type = {
993 .name = "acpi",
994 .match = acpi_bus_match,
995 .probe = acpi_device_probe,
996 .remove = acpi_device_remove,
997 .uevent = acpi_device_uevent,
998 };
999
1000 int acpi_device_add(struct acpi_device *device,
1001 void (*release)(struct device *))
1002 {
1003 int result;
1004 struct acpi_device_bus_id *acpi_device_bus_id, *new_bus_id;
1005 int found = 0;
1006
1007 if (device->handle) {
1008 acpi_status status;
1009
1010 status = acpi_attach_data(device->handle, acpi_bus_data_handler,
1011 device);
1012 if (ACPI_FAILURE(status)) {
1013 acpi_handle_err(device->handle,
1014 "Unable to attach device data\n");
1015 return -ENODEV;
1016 }
1017 }
1018
1019 /*
1020 * Linkage
1021 * -------
1022 * Link this device to its parent and siblings.
1023 */
1024 INIT_LIST_HEAD(&device->children);
1025 INIT_LIST_HEAD(&device->node);
1026 INIT_LIST_HEAD(&device->wakeup_list);
1027 INIT_LIST_HEAD(&device->physical_node_list);
1028 mutex_init(&device->physical_node_lock);
1029 INIT_LIST_HEAD(&device->power_dependent);
1030
1031 new_bus_id = kzalloc(sizeof(struct acpi_device_bus_id), GFP_KERNEL);
1032 if (!new_bus_id) {
1033 pr_err(PREFIX "Memory allocation error\n");
1034 result = -ENOMEM;
1035 goto err_detach;
1036 }
1037
1038 mutex_lock(&acpi_device_lock);
1039 /*
1040 * Find suitable bus_id and instance number in acpi_bus_id_list
1041 * If failed, create one and link it into acpi_bus_id_list
1042 */
1043 list_for_each_entry(acpi_device_bus_id, &acpi_bus_id_list, node) {
1044 if (!strcmp(acpi_device_bus_id->bus_id,
1045 acpi_device_hid(device))) {
1046 acpi_device_bus_id->instance_no++;
1047 found = 1;
1048 kfree(new_bus_id);
1049 break;
1050 }
1051 }
1052 if (!found) {
1053 acpi_device_bus_id = new_bus_id;
1054 strcpy(acpi_device_bus_id->bus_id, acpi_device_hid(device));
1055 acpi_device_bus_id->instance_no = 0;
1056 list_add_tail(&acpi_device_bus_id->node, &acpi_bus_id_list);
1057 }
1058 dev_set_name(&device->dev, "%s:%02x", acpi_device_bus_id->bus_id, acpi_device_bus_id->instance_no);
1059
1060 if (device->parent)
1061 list_add_tail(&device->node, &device->parent->children);
1062
1063 if (device->wakeup.flags.valid)
1064 list_add_tail(&device->wakeup_list, &acpi_wakeup_device_list);
1065 mutex_unlock(&acpi_device_lock);
1066
1067 if (device->parent)
1068 device->dev.parent = &device->parent->dev;
1069 device->dev.bus = &acpi_bus_type;
1070 device->dev.release = release;
1071 result = device_add(&device->dev);
1072 if (result) {
1073 dev_err(&device->dev, "Error registering device\n");
1074 goto err;
1075 }
1076
1077 result = acpi_device_setup_files(device);
1078 if (result)
1079 printk(KERN_ERR PREFIX "Error creating sysfs interface for device %s\n",
1080 dev_name(&device->dev));
1081
1082 return 0;
1083
1084 err:
1085 mutex_lock(&acpi_device_lock);
1086 if (device->parent)
1087 list_del(&device->node);
1088 list_del(&device->wakeup_list);
1089 mutex_unlock(&acpi_device_lock);
1090
1091 err_detach:
1092 acpi_detach_data(device->handle, acpi_bus_data_handler);
1093 return result;
1094 }
1095
1096 static void acpi_device_unregister(struct acpi_device *device)
1097 {
1098 mutex_lock(&acpi_device_lock);
1099 if (device->parent)
1100 list_del(&device->node);
1101
1102 list_del(&device->wakeup_list);
1103 mutex_unlock(&acpi_device_lock);
1104
1105 acpi_detach_data(device->handle, acpi_bus_data_handler);
1106
1107 acpi_power_add_remove_device(device, false);
1108 acpi_device_remove_files(device);
1109 if (device->remove)
1110 device->remove(device);
1111
1112 device_del(&device->dev);
1113 /*
1114 * Transition the device to D3cold to drop the reference counts of all
1115 * power resources the device depends on and turn off the ones that have
1116 * no more references.
1117 */
1118 acpi_device_set_power(device, ACPI_STATE_D3_COLD);
1119 device->handle = NULL;
1120 put_device(&device->dev);
1121 }
1122
1123 /* --------------------------------------------------------------------------
1124 Driver Management
1125 -------------------------------------------------------------------------- */
1126 /**
1127 * acpi_bus_register_driver - register a driver with the ACPI bus
1128 * @driver: driver being registered
1129 *
1130 * Registers a driver with the ACPI bus. Searches the namespace for all
1131 * devices that match the driver's criteria and binds. Returns zero for
1132 * success or a negative error status for failure.
1133 */
1134 int acpi_bus_register_driver(struct acpi_driver *driver)
1135 {
1136 int ret;
1137
1138 if (acpi_disabled)
1139 return -ENODEV;
1140 driver->drv.name = driver->name;
1141 driver->drv.bus = &acpi_bus_type;
1142 driver->drv.owner = driver->owner;
1143
1144 ret = driver_register(&driver->drv);
1145 return ret;
1146 }
1147
1148 EXPORT_SYMBOL(acpi_bus_register_driver);
1149
1150 /**
1151 * acpi_bus_unregister_driver - unregisters a driver with the APIC bus
1152 * @driver: driver to unregister
1153 *
1154 * Unregisters a driver with the ACPI bus. Searches the namespace for all
1155 * devices that match the driver's criteria and unbinds.
1156 */
1157 void acpi_bus_unregister_driver(struct acpi_driver *driver)
1158 {
1159 driver_unregister(&driver->drv);
1160 }
1161
1162 EXPORT_SYMBOL(acpi_bus_unregister_driver);
1163
1164 /* --------------------------------------------------------------------------
1165 Device Enumeration
1166 -------------------------------------------------------------------------- */
1167 static struct acpi_device *acpi_bus_get_parent(acpi_handle handle)
1168 {
1169 struct acpi_device *device = NULL;
1170 acpi_status status;
1171
1172 /*
1173 * Fixed hardware devices do not appear in the namespace and do not
1174 * have handles, but we fabricate acpi_devices for them, so we have
1175 * to deal with them specially.
1176 */
1177 if (!handle)
1178 return acpi_root;
1179
1180 do {
1181 status = acpi_get_parent(handle, &handle);
1182 if (ACPI_FAILURE(status))
1183 return status == AE_NULL_ENTRY ? NULL : acpi_root;
1184 } while (acpi_bus_get_device(handle, &device));
1185 return device;
1186 }
1187
1188 acpi_status
1189 acpi_bus_get_ejd(acpi_handle handle, acpi_handle *ejd)
1190 {
1191 acpi_status status;
1192 acpi_handle tmp;
1193 struct acpi_buffer buffer = {ACPI_ALLOCATE_BUFFER, NULL};
1194 union acpi_object *obj;
1195
1196 status = acpi_get_handle(handle, "_EJD", &tmp);
1197 if (ACPI_FAILURE(status))
1198 return status;
1199
1200 status = acpi_evaluate_object(handle, "_EJD", NULL, &buffer);
1201 if (ACPI_SUCCESS(status)) {
1202 obj = buffer.pointer;
1203 status = acpi_get_handle(ACPI_ROOT_OBJECT, obj->string.pointer,
1204 ejd);
1205 kfree(buffer.pointer);
1206 }
1207 return status;
1208 }
1209 EXPORT_SYMBOL_GPL(acpi_bus_get_ejd);
1210
1211 void acpi_bus_data_handler(acpi_handle handle, void *context)
1212 {
1213
1214 /* TBD */
1215
1216 return;
1217 }
1218
1219 static int acpi_bus_extract_wakeup_device_power_package(acpi_handle handle,
1220 struct acpi_device_wakeup *wakeup)
1221 {
1222 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
1223 union acpi_object *package = NULL;
1224 union acpi_object *element = NULL;
1225 acpi_status status;
1226 int err = -ENODATA;
1227
1228 if (!wakeup)
1229 return -EINVAL;
1230
1231 INIT_LIST_HEAD(&wakeup->resources);
1232
1233 /* _PRW */
1234 status = acpi_evaluate_object(handle, "_PRW", NULL, &buffer);
1235 if (ACPI_FAILURE(status)) {
1236 ACPI_EXCEPTION((AE_INFO, status, "Evaluating _PRW"));
1237 return err;
1238 }
1239
1240 package = (union acpi_object *)buffer.pointer;
1241
1242 if (!package || package->package.count < 2)
1243 goto out;
1244
1245 element = &(package->package.elements[0]);
1246 if (!element)
1247 goto out;
1248
1249 if (element->type == ACPI_TYPE_PACKAGE) {
1250 if ((element->package.count < 2) ||
1251 (element->package.elements[0].type !=
1252 ACPI_TYPE_LOCAL_REFERENCE)
1253 || (element->package.elements[1].type != ACPI_TYPE_INTEGER))
1254 goto out;
1255
1256 wakeup->gpe_device =
1257 element->package.elements[0].reference.handle;
1258 wakeup->gpe_number =
1259 (u32) element->package.elements[1].integer.value;
1260 } else if (element->type == ACPI_TYPE_INTEGER) {
1261 wakeup->gpe_device = NULL;
1262 wakeup->gpe_number = element->integer.value;
1263 } else {
1264 goto out;
1265 }
1266
1267 element = &(package->package.elements[1]);
1268 if (element->type != ACPI_TYPE_INTEGER)
1269 goto out;
1270
1271 wakeup->sleep_state = element->integer.value;
1272
1273 err = acpi_extract_power_resources(package, 2, &wakeup->resources);
1274 if (err)
1275 goto out;
1276
1277 if (!list_empty(&wakeup->resources)) {
1278 int sleep_state;
1279
1280 err = acpi_power_wakeup_list_init(&wakeup->resources,
1281 &sleep_state);
1282 if (err) {
1283 acpi_handle_warn(handle, "Retrieving current states "
1284 "of wakeup power resources failed\n");
1285 acpi_power_resources_list_free(&wakeup->resources);
1286 goto out;
1287 }
1288 if (sleep_state < wakeup->sleep_state) {
1289 acpi_handle_warn(handle, "Overriding _PRW sleep state "
1290 "(S%d) by S%d from power resources\n",
1291 (int)wakeup->sleep_state, sleep_state);
1292 wakeup->sleep_state = sleep_state;
1293 }
1294 }
1295 acpi_setup_gpe_for_wake(handle, wakeup->gpe_device, wakeup->gpe_number);
1296
1297 out:
1298 kfree(buffer.pointer);
1299 return err;
1300 }
1301
1302 static void acpi_bus_set_run_wake_flags(struct acpi_device *device)
1303 {
1304 struct acpi_device_id button_device_ids[] = {
1305 {"PNP0C0C", 0},
1306 {"PNP0C0D", 0},
1307 {"PNP0C0E", 0},
1308 {"", 0},
1309 };
1310 acpi_status status;
1311 acpi_event_status event_status;
1312
1313 device->wakeup.flags.notifier_present = 0;
1314
1315 /* Power button, Lid switch always enable wakeup */
1316 if (!acpi_match_device_ids(device, button_device_ids)) {
1317 device->wakeup.flags.run_wake = 1;
1318 if (!acpi_match_device_ids(device, &button_device_ids[1])) {
1319 /* Do not use Lid/sleep button for S5 wakeup */
1320 if (device->wakeup.sleep_state == ACPI_STATE_S5)
1321 device->wakeup.sleep_state = ACPI_STATE_S4;
1322 }
1323 device_set_wakeup_capable(&device->dev, true);
1324 return;
1325 }
1326
1327 status = acpi_get_gpe_status(device->wakeup.gpe_device,
1328 device->wakeup.gpe_number,
1329 &event_status);
1330 if (status == AE_OK)
1331 device->wakeup.flags.run_wake =
1332 !!(event_status & ACPI_EVENT_FLAG_HANDLE);
1333 }
1334
1335 static void acpi_bus_get_wakeup_device_flags(struct acpi_device *device)
1336 {
1337 acpi_handle temp;
1338 acpi_status status = 0;
1339 int err;
1340
1341 /* Presence of _PRW indicates wake capable */
1342 status = acpi_get_handle(device->handle, "_PRW", &temp);
1343 if (ACPI_FAILURE(status))
1344 return;
1345
1346 err = acpi_bus_extract_wakeup_device_power_package(device->handle,
1347 &device->wakeup);
1348 if (err) {
1349 dev_err(&device->dev, "_PRW evaluation error: %d\n", err);
1350 return;
1351 }
1352
1353 device->wakeup.flags.valid = 1;
1354 device->wakeup.prepare_count = 0;
1355 acpi_bus_set_run_wake_flags(device);
1356 /* Call _PSW/_DSW object to disable its ability to wake the sleeping
1357 * system for the ACPI device with the _PRW object.
1358 * The _PSW object is depreciated in ACPI 3.0 and is replaced by _DSW.
1359 * So it is necessary to call _DSW object first. Only when it is not
1360 * present will the _PSW object used.
1361 */
1362 err = acpi_device_sleep_wake(device, 0, 0, 0);
1363 if (err)
1364 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
1365 "error in _DSW or _PSW evaluation\n"));
1366 }
1367
1368 static void acpi_bus_init_power_state(struct acpi_device *device, int state)
1369 {
1370 struct acpi_device_power_state *ps = &device->power.states[state];
1371 char pathname[5] = { '_', 'P', 'R', '0' + state, '\0' };
1372 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
1373 acpi_handle handle;
1374 acpi_status status;
1375
1376 INIT_LIST_HEAD(&ps->resources);
1377
1378 /* Evaluate "_PRx" to get referenced power resources */
1379 status = acpi_evaluate_object(device->handle, pathname, NULL, &buffer);
1380 if (ACPI_SUCCESS(status)) {
1381 union acpi_object *package = buffer.pointer;
1382
1383 if (buffer.length && package
1384 && package->type == ACPI_TYPE_PACKAGE
1385 && package->package.count) {
1386 int err = acpi_extract_power_resources(package, 0,
1387 &ps->resources);
1388 if (!err)
1389 device->power.flags.power_resources = 1;
1390 }
1391 ACPI_FREE(buffer.pointer);
1392 }
1393
1394 /* Evaluate "_PSx" to see if we can do explicit sets */
1395 pathname[2] = 'S';
1396 status = acpi_get_handle(device->handle, pathname, &handle);
1397 if (ACPI_SUCCESS(status))
1398 ps->flags.explicit_set = 1;
1399
1400 /*
1401 * State is valid if there are means to put the device into it.
1402 * D3hot is only valid if _PR3 present.
1403 */
1404 if (!list_empty(&ps->resources)
1405 || (ps->flags.explicit_set && state < ACPI_STATE_D3_HOT)) {
1406 ps->flags.valid = 1;
1407 ps->flags.os_accessible = 1;
1408 }
1409
1410 ps->power = -1; /* Unknown - driver assigned */
1411 ps->latency = -1; /* Unknown - driver assigned */
1412 }
1413
1414 static void acpi_bus_get_power_flags(struct acpi_device *device)
1415 {
1416 acpi_status status;
1417 acpi_handle handle;
1418 u32 i;
1419
1420 /* Presence of _PS0|_PR0 indicates 'power manageable' */
1421 status = acpi_get_handle(device->handle, "_PS0", &handle);
1422 if (ACPI_FAILURE(status)) {
1423 status = acpi_get_handle(device->handle, "_PR0", &handle);
1424 if (ACPI_FAILURE(status))
1425 return;
1426 }
1427
1428 device->flags.power_manageable = 1;
1429
1430 /*
1431 * Power Management Flags
1432 */
1433 status = acpi_get_handle(device->handle, "_PSC", &handle);
1434 if (ACPI_SUCCESS(status))
1435 device->power.flags.explicit_get = 1;
1436 status = acpi_get_handle(device->handle, "_IRC", &handle);
1437 if (ACPI_SUCCESS(status))
1438 device->power.flags.inrush_current = 1;
1439
1440 /*
1441 * Enumerate supported power management states
1442 */
1443 for (i = ACPI_STATE_D0; i <= ACPI_STATE_D3_HOT; i++)
1444 acpi_bus_init_power_state(device, i);
1445
1446 INIT_LIST_HEAD(&device->power.states[ACPI_STATE_D3_COLD].resources);
1447
1448 /* Set defaults for D0 and D3 states (always valid) */
1449 device->power.states[ACPI_STATE_D0].flags.valid = 1;
1450 device->power.states[ACPI_STATE_D0].power = 100;
1451 device->power.states[ACPI_STATE_D3].flags.valid = 1;
1452 device->power.states[ACPI_STATE_D3].power = 0;
1453
1454 /* Set D3cold's explicit_set flag if _PS3 exists. */
1455 if (device->power.states[ACPI_STATE_D3_HOT].flags.explicit_set)
1456 device->power.states[ACPI_STATE_D3_COLD].flags.explicit_set = 1;
1457
1458 /* Presence of _PS3 or _PRx means we can put the device into D3 cold */
1459 if (device->power.states[ACPI_STATE_D3_HOT].flags.explicit_set ||
1460 device->power.flags.power_resources)
1461 device->power.states[ACPI_STATE_D3_COLD].flags.os_accessible = 1;
1462
1463 if (acpi_bus_init_power(device)) {
1464 acpi_free_power_resources_lists(device);
1465 device->flags.power_manageable = 0;
1466 }
1467 }
1468
1469 static void acpi_bus_get_flags(struct acpi_device *device)
1470 {
1471 acpi_status status = AE_OK;
1472 acpi_handle temp = NULL;
1473
1474 /* Presence of _STA indicates 'dynamic_status' */
1475 status = acpi_get_handle(device->handle, "_STA", &temp);
1476 if (ACPI_SUCCESS(status))
1477 device->flags.dynamic_status = 1;
1478
1479 /* Presence of _RMV indicates 'removable' */
1480 status = acpi_get_handle(device->handle, "_RMV", &temp);
1481 if (ACPI_SUCCESS(status))
1482 device->flags.removable = 1;
1483
1484 /* Presence of _EJD|_EJ0 indicates 'ejectable' */
1485 status = acpi_get_handle(device->handle, "_EJD", &temp);
1486 if (ACPI_SUCCESS(status))
1487 device->flags.ejectable = 1;
1488 else {
1489 status = acpi_get_handle(device->handle, "_EJ0", &temp);
1490 if (ACPI_SUCCESS(status))
1491 device->flags.ejectable = 1;
1492 }
1493 }
1494
1495 static void acpi_device_get_busid(struct acpi_device *device)
1496 {
1497 char bus_id[5] = { '?', 0 };
1498 struct acpi_buffer buffer = { sizeof(bus_id), bus_id };
1499 int i = 0;
1500
1501 /*
1502 * Bus ID
1503 * ------
1504 * The device's Bus ID is simply the object name.
1505 * TBD: Shouldn't this value be unique (within the ACPI namespace)?
1506 */
1507 if (ACPI_IS_ROOT_DEVICE(device)) {
1508 strcpy(device->pnp.bus_id, "ACPI");
1509 return;
1510 }
1511
1512 switch (device->device_type) {
1513 case ACPI_BUS_TYPE_POWER_BUTTON:
1514 strcpy(device->pnp.bus_id, "PWRF");
1515 break;
1516 case ACPI_BUS_TYPE_SLEEP_BUTTON:
1517 strcpy(device->pnp.bus_id, "SLPF");
1518 break;
1519 default:
1520 acpi_get_name(device->handle, ACPI_SINGLE_NAME, &buffer);
1521 /* Clean up trailing underscores (if any) */
1522 for (i = 3; i > 1; i--) {
1523 if (bus_id[i] == '_')
1524 bus_id[i] = '\0';
1525 else
1526 break;
1527 }
1528 strcpy(device->pnp.bus_id, bus_id);
1529 break;
1530 }
1531 }
1532
1533 /*
1534 * acpi_bay_match - see if an acpi object is an ejectable driver bay
1535 *
1536 * If an acpi object is ejectable and has one of the ACPI ATA methods defined,
1537 * then we can safely call it an ejectable drive bay
1538 */
1539 static int acpi_bay_match(acpi_handle handle)
1540 {
1541 acpi_status status;
1542 acpi_handle tmp;
1543 acpi_handle phandle;
1544
1545 status = acpi_get_handle(handle, "_EJ0", &tmp);
1546 if (ACPI_FAILURE(status))
1547 return -ENODEV;
1548
1549 if ((ACPI_SUCCESS(acpi_get_handle(handle, "_GTF", &tmp))) ||
1550 (ACPI_SUCCESS(acpi_get_handle(handle, "_GTM", &tmp))) ||
1551 (ACPI_SUCCESS(acpi_get_handle(handle, "_STM", &tmp))) ||
1552 (ACPI_SUCCESS(acpi_get_handle(handle, "_SDD", &tmp))))
1553 return 0;
1554
1555 if (acpi_get_parent(handle, &phandle))
1556 return -ENODEV;
1557
1558 if ((ACPI_SUCCESS(acpi_get_handle(phandle, "_GTF", &tmp))) ||
1559 (ACPI_SUCCESS(acpi_get_handle(phandle, "_GTM", &tmp))) ||
1560 (ACPI_SUCCESS(acpi_get_handle(phandle, "_STM", &tmp))) ||
1561 (ACPI_SUCCESS(acpi_get_handle(phandle, "_SDD", &tmp))))
1562 return 0;
1563
1564 return -ENODEV;
1565 }
1566
1567 /*
1568 * acpi_dock_match - see if an acpi object has a _DCK method
1569 */
1570 static int acpi_dock_match(acpi_handle handle)
1571 {
1572 acpi_handle tmp;
1573 return acpi_get_handle(handle, "_DCK", &tmp);
1574 }
1575
1576 const char *acpi_device_hid(struct acpi_device *device)
1577 {
1578 struct acpi_hardware_id *hid;
1579
1580 if (list_empty(&device->pnp.ids))
1581 return dummy_hid;
1582
1583 hid = list_first_entry(&device->pnp.ids, struct acpi_hardware_id, list);
1584 return hid->id;
1585 }
1586 EXPORT_SYMBOL(acpi_device_hid);
1587
1588 static void acpi_add_id(struct acpi_device_pnp *pnp, const char *dev_id)
1589 {
1590 struct acpi_hardware_id *id;
1591
1592 id = kmalloc(sizeof(*id), GFP_KERNEL);
1593 if (!id)
1594 return;
1595
1596 id->id = kstrdup(dev_id, GFP_KERNEL);
1597 if (!id->id) {
1598 kfree(id);
1599 return;
1600 }
1601
1602 list_add_tail(&id->list, &pnp->ids);
1603 pnp->type.hardware_id = 1;
1604 }
1605
1606 /*
1607 * Old IBM workstations have a DSDT bug wherein the SMBus object
1608 * lacks the SMBUS01 HID and the methods do not have the necessary "_"
1609 * prefix. Work around this.
1610 */
1611 static int acpi_ibm_smbus_match(acpi_handle handle)
1612 {
1613 acpi_handle h_dummy;
1614 struct acpi_buffer path = {ACPI_ALLOCATE_BUFFER, NULL};
1615 int result;
1616
1617 if (!dmi_name_in_vendors("IBM"))
1618 return -ENODEV;
1619
1620 /* Look for SMBS object */
1621 result = acpi_get_name(handle, ACPI_SINGLE_NAME, &path);
1622 if (result)
1623 return result;
1624
1625 if (strcmp("SMBS", path.pointer)) {
1626 result = -ENODEV;
1627 goto out;
1628 }
1629
1630 /* Does it have the necessary (but misnamed) methods? */
1631 result = -ENODEV;
1632 if (ACPI_SUCCESS(acpi_get_handle(handle, "SBI", &h_dummy)) &&
1633 ACPI_SUCCESS(acpi_get_handle(handle, "SBR", &h_dummy)) &&
1634 ACPI_SUCCESS(acpi_get_handle(handle, "SBW", &h_dummy)))
1635 result = 0;
1636 out:
1637 kfree(path.pointer);
1638 return result;
1639 }
1640
1641 static void acpi_set_pnp_ids(acpi_handle handle, struct acpi_device_pnp *pnp,
1642 int device_type)
1643 {
1644 acpi_status status;
1645 struct acpi_device_info *info;
1646 struct acpi_pnp_device_id_list *cid_list;
1647 int i;
1648
1649 switch (device_type) {
1650 case ACPI_BUS_TYPE_DEVICE:
1651 if (handle == ACPI_ROOT_OBJECT) {
1652 acpi_add_id(pnp, ACPI_SYSTEM_HID);
1653 break;
1654 }
1655
1656 status = acpi_get_object_info(handle, &info);
1657 if (ACPI_FAILURE(status)) {
1658 pr_err(PREFIX "%s: Error reading device info\n",
1659 __func__);
1660 return;
1661 }
1662
1663 if (info->valid & ACPI_VALID_HID)
1664 acpi_add_id(pnp, info->hardware_id.string);
1665 if (info->valid & ACPI_VALID_CID) {
1666 cid_list = &info->compatible_id_list;
1667 for (i = 0; i < cid_list->count; i++)
1668 acpi_add_id(pnp, cid_list->ids[i].string);
1669 }
1670 if (info->valid & ACPI_VALID_ADR) {
1671 pnp->bus_address = info->address;
1672 pnp->type.bus_address = 1;
1673 }
1674 if (info->valid & ACPI_VALID_UID)
1675 pnp->unique_id = kstrdup(info->unique_id.string,
1676 GFP_KERNEL);
1677
1678 kfree(info);
1679
1680 /*
1681 * Some devices don't reliably have _HIDs & _CIDs, so add
1682 * synthetic HIDs to make sure drivers can find them.
1683 */
1684 if (acpi_is_video_device(handle))
1685 acpi_add_id(pnp, ACPI_VIDEO_HID);
1686 else if (ACPI_SUCCESS(acpi_bay_match(handle)))
1687 acpi_add_id(pnp, ACPI_BAY_HID);
1688 else if (ACPI_SUCCESS(acpi_dock_match(handle)))
1689 acpi_add_id(pnp, ACPI_DOCK_HID);
1690 else if (!acpi_ibm_smbus_match(handle))
1691 acpi_add_id(pnp, ACPI_SMBUS_IBM_HID);
1692 else if (list_empty(&pnp->ids) && handle == ACPI_ROOT_OBJECT) {
1693 acpi_add_id(pnp, ACPI_BUS_HID); /* \_SB, LNXSYBUS */
1694 strcpy(pnp->device_name, ACPI_BUS_DEVICE_NAME);
1695 strcpy(pnp->device_class, ACPI_BUS_CLASS);
1696 }
1697
1698 break;
1699 case ACPI_BUS_TYPE_POWER:
1700 acpi_add_id(pnp, ACPI_POWER_HID);
1701 break;
1702 case ACPI_BUS_TYPE_PROCESSOR:
1703 acpi_add_id(pnp, ACPI_PROCESSOR_OBJECT_HID);
1704 break;
1705 case ACPI_BUS_TYPE_THERMAL:
1706 acpi_add_id(pnp, ACPI_THERMAL_HID);
1707 break;
1708 case ACPI_BUS_TYPE_POWER_BUTTON:
1709 acpi_add_id(pnp, ACPI_BUTTON_HID_POWERF);
1710 break;
1711 case ACPI_BUS_TYPE_SLEEP_BUTTON:
1712 acpi_add_id(pnp, ACPI_BUTTON_HID_SLEEPF);
1713 break;
1714 }
1715 }
1716
1717 void acpi_free_pnp_ids(struct acpi_device_pnp *pnp)
1718 {
1719 struct acpi_hardware_id *id, *tmp;
1720
1721 list_for_each_entry_safe(id, tmp, &pnp->ids, list) {
1722 kfree(id->id);
1723 kfree(id);
1724 }
1725 kfree(pnp->unique_id);
1726 }
1727
1728 void acpi_init_device_object(struct acpi_device *device, acpi_handle handle,
1729 int type, unsigned long long sta)
1730 {
1731 INIT_LIST_HEAD(&device->pnp.ids);
1732 device->device_type = type;
1733 device->handle = handle;
1734 device->parent = acpi_bus_get_parent(handle);
1735 STRUCT_TO_INT(device->status) = sta;
1736 acpi_device_get_busid(device);
1737 acpi_set_pnp_ids(handle, &device->pnp, type);
1738 acpi_bus_get_flags(device);
1739 device->flags.match_driver = false;
1740 device_initialize(&device->dev);
1741 dev_set_uevent_suppress(&device->dev, true);
1742 }
1743
1744 void acpi_device_add_finalize(struct acpi_device *device)
1745 {
1746 device->flags.match_driver = true;
1747 dev_set_uevent_suppress(&device->dev, false);
1748 kobject_uevent(&device->dev.kobj, KOBJ_ADD);
1749 }
1750
1751 static int acpi_add_single_object(struct acpi_device **child,
1752 acpi_handle handle, int type,
1753 unsigned long long sta)
1754 {
1755 int result;
1756 struct acpi_device *device;
1757 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
1758
1759 device = kzalloc(sizeof(struct acpi_device), GFP_KERNEL);
1760 if (!device) {
1761 printk(KERN_ERR PREFIX "Memory allocation error\n");
1762 return -ENOMEM;
1763 }
1764
1765 acpi_init_device_object(device, handle, type, sta);
1766 acpi_bus_get_power_flags(device);
1767 acpi_bus_get_wakeup_device_flags(device);
1768
1769 result = acpi_device_add(device, acpi_device_release);
1770 if (result) {
1771 acpi_device_release(&device->dev);
1772 return result;
1773 }
1774
1775 acpi_power_add_remove_device(device, true);
1776 acpi_device_add_finalize(device);
1777 acpi_get_name(handle, ACPI_FULL_PATHNAME, &buffer);
1778 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Added %s [%s] parent %s\n",
1779 dev_name(&device->dev), (char *) buffer.pointer,
1780 device->parent ? dev_name(&device->parent->dev) : "(null)"));
1781 kfree(buffer.pointer);
1782 *child = device;
1783 return 0;
1784 }
1785
1786 static int acpi_bus_type_and_status(acpi_handle handle, int *type,
1787 unsigned long long *sta)
1788 {
1789 acpi_status status;
1790 acpi_object_type acpi_type;
1791
1792 status = acpi_get_type(handle, &acpi_type);
1793 if (ACPI_FAILURE(status))
1794 return -ENODEV;
1795
1796 switch (acpi_type) {
1797 case ACPI_TYPE_ANY: /* for ACPI_ROOT_OBJECT */
1798 case ACPI_TYPE_DEVICE:
1799 *type = ACPI_BUS_TYPE_DEVICE;
1800 status = acpi_bus_get_status_handle(handle, sta);
1801 if (ACPI_FAILURE(status))
1802 return -ENODEV;
1803 break;
1804 case ACPI_TYPE_PROCESSOR:
1805 *type = ACPI_BUS_TYPE_PROCESSOR;
1806 status = acpi_bus_get_status_handle(handle, sta);
1807 if (ACPI_FAILURE(status))
1808 return -ENODEV;
1809 break;
1810 case ACPI_TYPE_THERMAL:
1811 *type = ACPI_BUS_TYPE_THERMAL;
1812 *sta = ACPI_STA_DEFAULT;
1813 break;
1814 case ACPI_TYPE_POWER:
1815 *type = ACPI_BUS_TYPE_POWER;
1816 *sta = ACPI_STA_DEFAULT;
1817 break;
1818 default:
1819 return -ENODEV;
1820 }
1821
1822 return 0;
1823 }
1824
1825 static bool acpi_scan_handler_matching(struct acpi_scan_handler *handler,
1826 char *idstr,
1827 const struct acpi_device_id **matchid)
1828 {
1829 const struct acpi_device_id *devid;
1830
1831 for (devid = handler->ids; devid->id[0]; devid++)
1832 if (!strcmp((char *)devid->id, idstr)) {
1833 if (matchid)
1834 *matchid = devid;
1835
1836 return true;
1837 }
1838
1839 return false;
1840 }
1841
1842 static struct acpi_scan_handler *acpi_scan_match_handler(char *idstr,
1843 const struct acpi_device_id **matchid)
1844 {
1845 struct acpi_scan_handler *handler;
1846
1847 list_for_each_entry(handler, &acpi_scan_handlers_list, list_node)
1848 if (acpi_scan_handler_matching(handler, idstr, matchid))
1849 return handler;
1850
1851 return NULL;
1852 }
1853
1854 void acpi_scan_hotplug_enabled(struct acpi_hotplug_profile *hotplug, bool val)
1855 {
1856 if (!!hotplug->enabled == !!val)
1857 return;
1858
1859 mutex_lock(&acpi_scan_lock);
1860
1861 hotplug->enabled = val;
1862
1863 mutex_unlock(&acpi_scan_lock);
1864 }
1865
1866 static void acpi_scan_init_hotplug(acpi_handle handle, int type)
1867 {
1868 struct acpi_device_pnp pnp = {};
1869 struct acpi_hardware_id *hwid;
1870 struct acpi_scan_handler *handler;
1871
1872 INIT_LIST_HEAD(&pnp.ids);
1873 acpi_set_pnp_ids(handle, &pnp, type);
1874
1875 if (!pnp.type.hardware_id)
1876 goto out;
1877
1878 /*
1879 * This relies on the fact that acpi_install_notify_handler() will not
1880 * install the same notify handler routine twice for the same handle.
1881 */
1882 list_for_each_entry(hwid, &pnp.ids, list) {
1883 handler = acpi_scan_match_handler(hwid->id, NULL);
1884 if (handler) {
1885 acpi_install_notify_handler(handle, ACPI_SYSTEM_NOTIFY,
1886 acpi_hotplug_notify_cb, handler);
1887 break;
1888 }
1889 }
1890
1891 out:
1892 acpi_free_pnp_ids(&pnp);
1893 }
1894
1895 static acpi_status acpi_bus_check_add(acpi_handle handle, u32 lvl_not_used,
1896 void *not_used, void **return_value)
1897 {
1898 struct acpi_device *device = NULL;
1899 int type;
1900 unsigned long long sta;
1901 acpi_status status;
1902 int result;
1903
1904 acpi_bus_get_device(handle, &device);
1905 if (device)
1906 goto out;
1907
1908 result = acpi_bus_type_and_status(handle, &type, &sta);
1909 if (result)
1910 return AE_OK;
1911
1912 if (type == ACPI_BUS_TYPE_POWER) {
1913 acpi_add_power_resource(handle);
1914 return AE_OK;
1915 }
1916
1917 acpi_scan_init_hotplug(handle, type);
1918
1919 if (!(sta & ACPI_STA_DEVICE_PRESENT) &&
1920 !(sta & ACPI_STA_DEVICE_FUNCTIONING)) {
1921 struct acpi_device_wakeup wakeup;
1922 acpi_handle temp;
1923
1924 status = acpi_get_handle(handle, "_PRW", &temp);
1925 if (ACPI_SUCCESS(status)) {
1926 acpi_bus_extract_wakeup_device_power_package(handle,
1927 &wakeup);
1928 acpi_power_resources_list_free(&wakeup.resources);
1929 }
1930 return AE_CTRL_DEPTH;
1931 }
1932
1933 acpi_add_single_object(&device, handle, type, sta);
1934 if (!device)
1935 return AE_CTRL_DEPTH;
1936
1937 out:
1938 if (!*return_value)
1939 *return_value = device;
1940
1941 return AE_OK;
1942 }
1943
1944 static int acpi_scan_attach_handler(struct acpi_device *device)
1945 {
1946 struct acpi_hardware_id *hwid;
1947 int ret = 0;
1948
1949 list_for_each_entry(hwid, &device->pnp.ids, list) {
1950 const struct acpi_device_id *devid;
1951 struct acpi_scan_handler *handler;
1952
1953 handler = acpi_scan_match_handler(hwid->id, &devid);
1954 if (handler) {
1955 ret = handler->attach(device, devid);
1956 if (ret > 0) {
1957 device->handler = handler;
1958 break;
1959 } else if (ret < 0) {
1960 break;
1961 }
1962 }
1963 }
1964 return ret;
1965 }
1966
1967 static acpi_status acpi_bus_device_attach(acpi_handle handle, u32 lvl_not_used,
1968 void *not_used, void **ret_not_used)
1969 {
1970 struct acpi_device *device;
1971 unsigned long long sta_not_used;
1972 int ret;
1973
1974 /*
1975 * Ignore errors ignored by acpi_bus_check_add() to avoid terminating
1976 * namespace walks prematurely.
1977 */
1978 if (acpi_bus_type_and_status(handle, &ret, &sta_not_used))
1979 return AE_OK;
1980
1981 if (acpi_bus_get_device(handle, &device))
1982 return AE_CTRL_DEPTH;
1983
1984 ret = acpi_scan_attach_handler(device);
1985 if (ret)
1986 return ret > 0 ? AE_OK : AE_CTRL_DEPTH;
1987
1988 ret = device_attach(&device->dev);
1989 return ret >= 0 ? AE_OK : AE_CTRL_DEPTH;
1990 }
1991
1992 /**
1993 * acpi_bus_scan - Add ACPI device node objects in a given namespace scope.
1994 * @handle: Root of the namespace scope to scan.
1995 *
1996 * Scan a given ACPI tree (probably recently hot-plugged) and create and add
1997 * found devices.
1998 *
1999 * If no devices were found, -ENODEV is returned, but it does not mean that
2000 * there has been a real error. There just have been no suitable ACPI objects
2001 * in the table trunk from which the kernel could create a device and add an
2002 * appropriate driver.
2003 *
2004 * Must be called under acpi_scan_lock.
2005 */
2006 int acpi_bus_scan(acpi_handle handle)
2007 {
2008 void *device = NULL;
2009 int error = 0;
2010
2011 if (ACPI_SUCCESS(acpi_bus_check_add(handle, 0, NULL, &device)))
2012 acpi_walk_namespace(ACPI_TYPE_ANY, handle, ACPI_UINT32_MAX,
2013 acpi_bus_check_add, NULL, NULL, &device);
2014
2015 if (!device)
2016 error = -ENODEV;
2017 else if (ACPI_SUCCESS(acpi_bus_device_attach(handle, 0, NULL, NULL)))
2018 acpi_walk_namespace(ACPI_TYPE_ANY, handle, ACPI_UINT32_MAX,
2019 acpi_bus_device_attach, NULL, NULL, NULL);
2020
2021 return error;
2022 }
2023 EXPORT_SYMBOL(acpi_bus_scan);
2024
2025 static acpi_status acpi_bus_device_detach(acpi_handle handle, u32 lvl_not_used,
2026 void *not_used, void **ret_not_used)
2027 {
2028 struct acpi_device *device = NULL;
2029
2030 if (!acpi_bus_get_device(handle, &device)) {
2031 struct acpi_scan_handler *dev_handler = device->handler;
2032
2033 if (dev_handler) {
2034 if (dev_handler->detach)
2035 dev_handler->detach(device);
2036
2037 device->handler = NULL;
2038 } else {
2039 device_release_driver(&device->dev);
2040 }
2041 }
2042 return AE_OK;
2043 }
2044
2045 static acpi_status acpi_bus_remove(acpi_handle handle, u32 lvl_not_used,
2046 void *not_used, void **ret_not_used)
2047 {
2048 struct acpi_device *device = NULL;
2049
2050 if (!acpi_bus_get_device(handle, &device))
2051 acpi_device_unregister(device);
2052
2053 return AE_OK;
2054 }
2055
2056 /**
2057 * acpi_bus_trim - Remove ACPI device node and all of its descendants
2058 * @start: Root of the ACPI device nodes subtree to remove.
2059 *
2060 * Must be called under acpi_scan_lock.
2061 */
2062 void acpi_bus_trim(struct acpi_device *start)
2063 {
2064 /*
2065 * Execute acpi_bus_device_detach() as a post-order callback to detach
2066 * all ACPI drivers from the device nodes being removed.
2067 */
2068 acpi_walk_namespace(ACPI_TYPE_ANY, start->handle, ACPI_UINT32_MAX, NULL,
2069 acpi_bus_device_detach, NULL, NULL);
2070 acpi_bus_device_detach(start->handle, 0, NULL, NULL);
2071 /*
2072 * Execute acpi_bus_remove() as a post-order callback to remove device
2073 * nodes in the given namespace scope.
2074 */
2075 acpi_walk_namespace(ACPI_TYPE_ANY, start->handle, ACPI_UINT32_MAX, NULL,
2076 acpi_bus_remove, NULL, NULL);
2077 acpi_bus_remove(start->handle, 0, NULL, NULL);
2078 }
2079 EXPORT_SYMBOL_GPL(acpi_bus_trim);
2080
2081 static int acpi_bus_scan_fixed(void)
2082 {
2083 int result = 0;
2084
2085 /*
2086 * Enumerate all fixed-feature devices.
2087 */
2088 if (!(acpi_gbl_FADT.flags & ACPI_FADT_POWER_BUTTON)) {
2089 struct acpi_device *device = NULL;
2090
2091 result = acpi_add_single_object(&device, NULL,
2092 ACPI_BUS_TYPE_POWER_BUTTON,
2093 ACPI_STA_DEFAULT);
2094 if (result)
2095 return result;
2096
2097 result = device_attach(&device->dev);
2098 if (result < 0)
2099 return result;
2100
2101 device_init_wakeup(&device->dev, true);
2102 }
2103
2104 if (!(acpi_gbl_FADT.flags & ACPI_FADT_SLEEP_BUTTON)) {
2105 struct acpi_device *device = NULL;
2106
2107 result = acpi_add_single_object(&device, NULL,
2108 ACPI_BUS_TYPE_SLEEP_BUTTON,
2109 ACPI_STA_DEFAULT);
2110 if (result)
2111 return result;
2112
2113 result = device_attach(&device->dev);
2114 }
2115
2116 return result < 0 ? result : 0;
2117 }
2118
2119 int __init acpi_scan_init(void)
2120 {
2121 int result;
2122
2123 result = bus_register(&acpi_bus_type);
2124 if (result) {
2125 /* We don't want to quit even if we failed to add suspend/resume */
2126 printk(KERN_ERR PREFIX "Could not register bus type\n");
2127 }
2128
2129 acpi_pci_root_init();
2130 acpi_pci_link_init();
2131 acpi_processor_init();
2132 acpi_platform_init();
2133 acpi_lpss_init();
2134 acpi_cmos_rtc_init();
2135 acpi_container_init();
2136 acpi_memory_hotplug_init();
2137 acpi_dock_init();
2138
2139 mutex_lock(&acpi_scan_lock);
2140 /*
2141 * Enumerate devices in the ACPI namespace.
2142 */
2143 result = acpi_bus_scan(ACPI_ROOT_OBJECT);
2144 if (result)
2145 goto out;
2146
2147 result = acpi_bus_get_device(ACPI_ROOT_OBJECT, &acpi_root);
2148 if (result)
2149 goto out;
2150
2151 result = acpi_bus_scan_fixed();
2152 if (result) {
2153 acpi_device_unregister(acpi_root);
2154 goto out;
2155 }
2156
2157 acpi_update_all_gpes();
2158
2159 acpi_pci_root_hp_init();
2160
2161 out:
2162 mutex_unlock(&acpi_scan_lock);
2163 return result;
2164 }
Linux with added FPC-III support