This source file includes following definitions.
- acpi_object_path
- data_node_show_path
- acpi_data_node_attr_show
- acpi_data_node_release
- acpi_expose_nondev_subnodes
- acpi_hide_nondev_subnodes
- create_pnp_modalias
- create_of_modalias
- __acpi_device_uevent_modalias
- acpi_device_uevent_modalias
- __acpi_device_modalias
- acpi_device_modalias
- acpi_device_modalias_show
- real_power_state_show
- power_state_show
- acpi_eject_store
- acpi_device_hid_show
- acpi_device_uid_show
- acpi_device_adr_show
- acpi_device_path_show
- description_show
- acpi_device_sun_show
- acpi_device_hrv_show
- status_show
- acpi_device_setup_files
- acpi_device_remove_files
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14 #include <linux/acpi.h>
15 #include <linux/device.h>
16 #include <linux/export.h>
17 #include <linux/nls.h>
18
19 #include "internal.h"
20
21 static ssize_t acpi_object_path(acpi_handle handle, char *buf)
22 {
23 struct acpi_buffer path = {ACPI_ALLOCATE_BUFFER, NULL};
24 int result;
25
26 result = acpi_get_name(handle, ACPI_FULL_PATHNAME, &path);
27 if (result)
28 return result;
29
30 result = sprintf(buf, "%s\n", (char *)path.pointer);
31 kfree(path.pointer);
32 return result;
33 }
34
35 struct acpi_data_node_attr {
36 struct attribute attr;
37 ssize_t (*show)(struct acpi_data_node *, char *);
38 ssize_t (*store)(struct acpi_data_node *, const char *, size_t count);
39 };
40
41 #define DATA_NODE_ATTR(_name) \
42 static struct acpi_data_node_attr data_node_##_name = \
43 __ATTR(_name, 0444, data_node_show_##_name, NULL)
44
45 static ssize_t data_node_show_path(struct acpi_data_node *dn, char *buf)
46 {
47 return dn->handle ? acpi_object_path(dn->handle, buf) : 0;
48 }
49
50 DATA_NODE_ATTR(path);
51
52 static struct attribute *acpi_data_node_default_attrs[] = {
53 &data_node_path.attr,
54 NULL
55 };
56
57 #define to_data_node(k) container_of(k, struct acpi_data_node, kobj)
58 #define to_attr(a) container_of(a, struct acpi_data_node_attr, attr)
59
60 static ssize_t acpi_data_node_attr_show(struct kobject *kobj,
61 struct attribute *attr, char *buf)
62 {
63 struct acpi_data_node *dn = to_data_node(kobj);
64 struct acpi_data_node_attr *dn_attr = to_attr(attr);
65
66 return dn_attr->show ? dn_attr->show(dn, buf) : -ENXIO;
67 }
68
69 static const struct sysfs_ops acpi_data_node_sysfs_ops = {
70 .show = acpi_data_node_attr_show,
71 };
72
73 static void acpi_data_node_release(struct kobject *kobj)
74 {
75 struct acpi_data_node *dn = to_data_node(kobj);
76 complete(&dn->kobj_done);
77 }
78
79 static struct kobj_type acpi_data_node_ktype = {
80 .sysfs_ops = &acpi_data_node_sysfs_ops,
81 .default_attrs = acpi_data_node_default_attrs,
82 .release = acpi_data_node_release,
83 };
84
85 static void acpi_expose_nondev_subnodes(struct kobject *kobj,
86 struct acpi_device_data *data)
87 {
88 struct list_head *list = &data->subnodes;
89 struct acpi_data_node *dn;
90
91 if (list_empty(list))
92 return;
93
94 list_for_each_entry(dn, list, sibling) {
95 int ret;
96
97 init_completion(&dn->kobj_done);
98 ret = kobject_init_and_add(&dn->kobj, &acpi_data_node_ktype,
99 kobj, "%s", dn->name);
100 if (!ret)
101 acpi_expose_nondev_subnodes(&dn->kobj, &dn->data);
102 else if (dn->handle)
103 acpi_handle_err(dn->handle, "Failed to expose (%d)\n", ret);
104 }
105 }
106
107 static void acpi_hide_nondev_subnodes(struct acpi_device_data *data)
108 {
109 struct list_head *list = &data->subnodes;
110 struct acpi_data_node *dn;
111
112 if (list_empty(list))
113 return;
114
115 list_for_each_entry_reverse(dn, list, sibling) {
116 acpi_hide_nondev_subnodes(&dn->data);
117 kobject_put(&dn->kobj);
118 }
119 }
120
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132
133
134 static int create_pnp_modalias(struct acpi_device *acpi_dev, char *modalias,
135 int size)
136 {
137 int len;
138 int count;
139 struct acpi_hardware_id *id;
140
141
142 if (!acpi_device_is_present(acpi_dev))
143 return 0;
144
145
146
147
148
149
150 count = 0;
151 list_for_each_entry(id, &acpi_dev->pnp.ids, list)
152 if (strcmp(id->id, ACPI_DT_NAMESPACE_HID))
153 count++;
154
155 if (!count)
156 return 0;
157
158 len = snprintf(modalias, size, "acpi:");
159 if (len <= 0)
160 return len;
161
162 size -= len;
163
164 list_for_each_entry(id, &acpi_dev->pnp.ids, list) {
165 if (!strcmp(id->id, ACPI_DT_NAMESPACE_HID))
166 continue;
167
168 count = snprintf(&modalias[len], size, "%s:", id->id);
169 if (count < 0)
170 return -EINVAL;
171
172 if (count >= size)
173 return -ENOMEM;
174
175 len += count;
176 size -= count;
177 }
178 modalias[len] = '\0';
179 return len;
180 }
181
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190
191
192 static int create_of_modalias(struct acpi_device *acpi_dev, char *modalias,
193 int size)
194 {
195 struct acpi_buffer buf = { ACPI_ALLOCATE_BUFFER };
196 const union acpi_object *of_compatible, *obj;
197 acpi_status status;
198 int len, count;
199 int i, nval;
200 char *c;
201
202 status = acpi_get_name(acpi_dev->handle, ACPI_SINGLE_NAME, &buf);
203 if (ACPI_FAILURE(status))
204 return -ENODEV;
205
206
207 for (c = buf.pointer; *c != '\0'; c++)
208 *c = tolower(*c);
209
210 len = snprintf(modalias, size, "of:N%sT", (char *)buf.pointer);
211 ACPI_FREE(buf.pointer);
212
213 if (len <= 0)
214 return len;
215
216 of_compatible = acpi_dev->data.of_compatible;
217 if (of_compatible->type == ACPI_TYPE_PACKAGE) {
218 nval = of_compatible->package.count;
219 obj = of_compatible->package.elements;
220 } else {
221 nval = 1;
222 obj = of_compatible;
223 }
224 for (i = 0; i < nval; i++, obj++) {
225 count = snprintf(&modalias[len], size, "C%s",
226 obj->string.pointer);
227 if (count < 0)
228 return -EINVAL;
229
230 if (count >= size)
231 return -ENOMEM;
232
233 len += count;
234 size -= count;
235 }
236 modalias[len] = '\0';
237 return len;
238 }
239
240 int __acpi_device_uevent_modalias(struct acpi_device *adev,
241 struct kobj_uevent_env *env)
242 {
243 int len;
244
245 if (!adev)
246 return -ENODEV;
247
248 if (list_empty(&adev->pnp.ids))
249 return 0;
250
251 if (add_uevent_var(env, "MODALIAS="))
252 return -ENOMEM;
253
254 len = create_pnp_modalias(adev, &env->buf[env->buflen - 1],
255 sizeof(env->buf) - env->buflen);
256 if (len < 0)
257 return len;
258
259 env->buflen += len;
260 if (!adev->data.of_compatible)
261 return 0;
262
263 if (len > 0 && add_uevent_var(env, "MODALIAS="))
264 return -ENOMEM;
265
266 len = create_of_modalias(adev, &env->buf[env->buflen - 1],
267 sizeof(env->buf) - env->buflen);
268 if (len < 0)
269 return len;
270
271 env->buflen += len;
272
273 return 0;
274 }
275
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283
284 int acpi_device_uevent_modalias(struct device *dev, struct kobj_uevent_env *env)
285 {
286 return __acpi_device_uevent_modalias(acpi_companion_match(dev), env);
287 }
288 EXPORT_SYMBOL_GPL(acpi_device_uevent_modalias);
289
290 static int __acpi_device_modalias(struct acpi_device *adev, char *buf, int size)
291 {
292 int len, count;
293
294 if (!adev)
295 return -ENODEV;
296
297 if (list_empty(&adev->pnp.ids))
298 return 0;
299
300 len = create_pnp_modalias(adev, buf, size - 1);
301 if (len < 0) {
302 return len;
303 } else if (len > 0) {
304 buf[len++] = '\n';
305 size -= len;
306 }
307 if (!adev->data.of_compatible)
308 return len;
309
310 count = create_of_modalias(adev, buf + len, size - 1);
311 if (count < 0) {
312 return count;
313 } else if (count > 0) {
314 len += count;
315 buf[len++] = '\n';
316 }
317
318 return len;
319 }
320
321
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324
325
326
327
328
329 int acpi_device_modalias(struct device *dev, char *buf, int size)
330 {
331 return __acpi_device_modalias(acpi_companion_match(dev), buf, size);
332 }
333 EXPORT_SYMBOL_GPL(acpi_device_modalias);
334
335 static ssize_t
336 acpi_device_modalias_show(struct device *dev, struct device_attribute *attr, char *buf)
337 {
338 return __acpi_device_modalias(to_acpi_device(dev), buf, 1024);
339 }
340 static DEVICE_ATTR(modalias, 0444, acpi_device_modalias_show, NULL);
341
342 static ssize_t real_power_state_show(struct device *dev,
343 struct device_attribute *attr, char *buf)
344 {
345 struct acpi_device *adev = to_acpi_device(dev);
346 int state;
347 int ret;
348
349 ret = acpi_device_get_power(adev, &state);
350 if (ret)
351 return ret;
352
353 return sprintf(buf, "%s\n", acpi_power_state_string(state));
354 }
355
356 static DEVICE_ATTR_RO(real_power_state);
357
358 static ssize_t power_state_show(struct device *dev,
359 struct device_attribute *attr, char *buf)
360 {
361 struct acpi_device *adev = to_acpi_device(dev);
362
363 return sprintf(buf, "%s\n", acpi_power_state_string(adev->power.state));
364 }
365
366 static DEVICE_ATTR_RO(power_state);
367
368 static ssize_t
369 acpi_eject_store(struct device *d, struct device_attribute *attr,
370 const char *buf, size_t count)
371 {
372 struct acpi_device *acpi_device = to_acpi_device(d);
373 acpi_object_type not_used;
374 acpi_status status;
375
376 if (!count || buf[0] != '1')
377 return -EINVAL;
378
379 if ((!acpi_device->handler || !acpi_device->handler->hotplug.enabled)
380 && !acpi_device->driver)
381 return -ENODEV;
382
383 status = acpi_get_type(acpi_device->handle, ¬_used);
384 if (ACPI_FAILURE(status) || !acpi_device->flags.ejectable)
385 return -ENODEV;
386
387 get_device(&acpi_device->dev);
388 status = acpi_hotplug_schedule(acpi_device, ACPI_OST_EC_OSPM_EJECT);
389 if (ACPI_SUCCESS(status))
390 return count;
391
392 put_device(&acpi_device->dev);
393 acpi_evaluate_ost(acpi_device->handle, ACPI_OST_EC_OSPM_EJECT,
394 ACPI_OST_SC_NON_SPECIFIC_FAILURE, NULL);
395 return status == AE_NO_MEMORY ? -ENOMEM : -EAGAIN;
396 }
397
398 static DEVICE_ATTR(eject, 0200, NULL, acpi_eject_store);
399
400 static ssize_t
401 acpi_device_hid_show(struct device *dev, struct device_attribute *attr, char *buf)
402 {
403 struct acpi_device *acpi_dev = to_acpi_device(dev);
404
405 return sprintf(buf, "%s\n", acpi_device_hid(acpi_dev));
406 }
407 static DEVICE_ATTR(hid, 0444, acpi_device_hid_show, NULL);
408
409 static ssize_t acpi_device_uid_show(struct device *dev,
410 struct device_attribute *attr, char *buf)
411 {
412 struct acpi_device *acpi_dev = to_acpi_device(dev);
413
414 return sprintf(buf, "%s\n", acpi_dev->pnp.unique_id);
415 }
416 static DEVICE_ATTR(uid, 0444, acpi_device_uid_show, NULL);
417
418 static ssize_t acpi_device_adr_show(struct device *dev,
419 struct device_attribute *attr, char *buf)
420 {
421 struct acpi_device *acpi_dev = to_acpi_device(dev);
422
423 if (acpi_dev->pnp.bus_address > U32_MAX)
424 return sprintf(buf, "0x%016llx\n", acpi_dev->pnp.bus_address);
425 else
426 return sprintf(buf, "0x%08llx\n", acpi_dev->pnp.bus_address);
427 }
428 static DEVICE_ATTR(adr, 0444, acpi_device_adr_show, NULL);
429
430 static ssize_t acpi_device_path_show(struct device *dev,
431 struct device_attribute *attr, char *buf)
432 {
433 struct acpi_device *acpi_dev = to_acpi_device(dev);
434
435 return acpi_object_path(acpi_dev->handle, buf);
436 }
437 static DEVICE_ATTR(path, 0444, acpi_device_path_show, NULL);
438
439
440 static ssize_t description_show(struct device *dev,
441 struct device_attribute *attr,
442 char *buf) {
443 struct acpi_device *acpi_dev = to_acpi_device(dev);
444 int result;
445
446 if (acpi_dev->pnp.str_obj == NULL)
447 return 0;
448
449
450
451
452
453 result = utf16s_to_utf8s(
454 (wchar_t *)acpi_dev->pnp.str_obj->buffer.pointer,
455 acpi_dev->pnp.str_obj->buffer.length,
456 UTF16_LITTLE_ENDIAN, buf,
457 PAGE_SIZE);
458
459 buf[result++] = '\n';
460
461 return result;
462 }
463 static DEVICE_ATTR_RO(description);
464
465 static ssize_t
466 acpi_device_sun_show(struct device *dev, struct device_attribute *attr,
467 char *buf) {
468 struct acpi_device *acpi_dev = to_acpi_device(dev);
469 acpi_status status;
470 unsigned long long sun;
471
472 status = acpi_evaluate_integer(acpi_dev->handle, "_SUN", NULL, &sun);
473 if (ACPI_FAILURE(status))
474 return -EIO;
475
476 return sprintf(buf, "%llu\n", sun);
477 }
478 static DEVICE_ATTR(sun, 0444, acpi_device_sun_show, NULL);
479
480 static ssize_t
481 acpi_device_hrv_show(struct device *dev, struct device_attribute *attr,
482 char *buf) {
483 struct acpi_device *acpi_dev = to_acpi_device(dev);
484 acpi_status status;
485 unsigned long long hrv;
486
487 status = acpi_evaluate_integer(acpi_dev->handle, "_HRV", NULL, &hrv);
488 if (ACPI_FAILURE(status))
489 return -EIO;
490
491 return sprintf(buf, "%llu\n", hrv);
492 }
493 static DEVICE_ATTR(hrv, 0444, acpi_device_hrv_show, NULL);
494
495 static ssize_t status_show(struct device *dev, struct device_attribute *attr,
496 char *buf) {
497 struct acpi_device *acpi_dev = to_acpi_device(dev);
498 acpi_status status;
499 unsigned long long sta;
500
501 status = acpi_evaluate_integer(acpi_dev->handle, "_STA", NULL, &sta);
502 if (ACPI_FAILURE(status))
503 return -EIO;
504
505 return sprintf(buf, "%llu\n", sta);
506 }
507 static DEVICE_ATTR_RO(status);
508
509
510
511
512
513 int acpi_device_setup_files(struct acpi_device *dev)
514 {
515 struct acpi_buffer buffer = {ACPI_ALLOCATE_BUFFER, NULL};
516 acpi_status status;
517 int result = 0;
518
519
520
521
522 if (dev->handle) {
523 result = device_create_file(&dev->dev, &dev_attr_path);
524 if (result)
525 goto end;
526 }
527
528 if (!list_empty(&dev->pnp.ids)) {
529 result = device_create_file(&dev->dev, &dev_attr_hid);
530 if (result)
531 goto end;
532
533 result = device_create_file(&dev->dev, &dev_attr_modalias);
534 if (result)
535 goto end;
536 }
537
538
539
540
541 if (acpi_has_method(dev->handle, "_STR")) {
542 status = acpi_evaluate_object(dev->handle, "_STR",
543 NULL, &buffer);
544 if (ACPI_FAILURE(status))
545 buffer.pointer = NULL;
546 dev->pnp.str_obj = buffer.pointer;
547 result = device_create_file(&dev->dev, &dev_attr_description);
548 if (result)
549 goto end;
550 }
551
552 if (dev->pnp.type.bus_address)
553 result = device_create_file(&dev->dev, &dev_attr_adr);
554 if (dev->pnp.unique_id)
555 result = device_create_file(&dev->dev, &dev_attr_uid);
556
557 if (acpi_has_method(dev->handle, "_SUN")) {
558 result = device_create_file(&dev->dev, &dev_attr_sun);
559 if (result)
560 goto end;
561 }
562
563 if (acpi_has_method(dev->handle, "_HRV")) {
564 result = device_create_file(&dev->dev, &dev_attr_hrv);
565 if (result)
566 goto end;
567 }
568
569 if (acpi_has_method(dev->handle, "_STA")) {
570 result = device_create_file(&dev->dev, &dev_attr_status);
571 if (result)
572 goto end;
573 }
574
575
576
577
578
579 if (acpi_has_method(dev->handle, "_EJ0")) {
580 result = device_create_file(&dev->dev, &dev_attr_eject);
581 if (result)
582 return result;
583 }
584
585 if (dev->flags.power_manageable) {
586 result = device_create_file(&dev->dev, &dev_attr_power_state);
587 if (result)
588 return result;
589
590 if (dev->power.flags.power_resources)
591 result = device_create_file(&dev->dev,
592 &dev_attr_real_power_state);
593 }
594
595 acpi_expose_nondev_subnodes(&dev->dev.kobj, &dev->data);
596
597 end:
598 return result;
599 }
600
601
602
603
604
605 void acpi_device_remove_files(struct acpi_device *dev)
606 {
607 acpi_hide_nondev_subnodes(&dev->data);
608
609 if (dev->flags.power_manageable) {
610 device_remove_file(&dev->dev, &dev_attr_power_state);
611 if (dev->power.flags.power_resources)
612 device_remove_file(&dev->dev,
613 &dev_attr_real_power_state);
614 }
615
616
617
618
619 if (acpi_has_method(dev->handle, "_STR")) {
620 kfree(dev->pnp.str_obj);
621 device_remove_file(&dev->dev, &dev_attr_description);
622 }
623
624
625
626 if (acpi_has_method(dev->handle, "_EJ0"))
627 device_remove_file(&dev->dev, &dev_attr_eject);
628
629 if (acpi_has_method(dev->handle, "_SUN"))
630 device_remove_file(&dev->dev, &dev_attr_sun);
631
632 if (acpi_has_method(dev->handle, "_HRV"))
633 device_remove_file(&dev->dev, &dev_attr_hrv);
634
635 if (dev->pnp.unique_id)
636 device_remove_file(&dev->dev, &dev_attr_uid);
637 if (dev->pnp.type.bus_address)
638 device_remove_file(&dev->dev, &dev_attr_adr);
639 device_remove_file(&dev->dev, &dev_attr_modalias);
640 device_remove_file(&dev->dev, &dev_attr_hid);
641 if (acpi_has_method(dev->handle, "_STA"))
642 device_remove_file(&dev->dev, &dev_attr_status);
643 if (dev->handle)
644 device_remove_file(&dev->dev, &dev_attr_path);
645 }