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1/*
2 * drivers/acpi/device_sysfs.c - ACPI device sysfs attributes and modalias.
3 *
4 * Copyright (C) 2015, Intel Corp.
5 * Author: Mika Westerberg <mika.westerberg@linux.intel.com>
6 * Author: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
7 *
8 * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
9 *
10 * This program is free software; you can redistribute it and/or modify
11 * it under the terms of the GNU General Public License version 2 as published
12 * by the Free Software Foundation.
13 *
14 * This program is distributed in the hope that it will be useful, but
15 * WITHOUT ANY WARRANTY; without even the implied warranty of
16 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
17 * General Public License for more details.
18 *
19 * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
20 */
21
22#include <linux/acpi.h>
23#include <linux/device.h>
24#include <linux/export.h>
25#include <linux/nls.h>
26
27#include "internal.h"
28
29static ssize_t acpi_object_path(acpi_handle handle, char *buf)
30{
31 struct acpi_buffer path = {ACPI_ALLOCATE_BUFFER, NULL};
32 int result;
33
34 result = acpi_get_name(handle, ACPI_FULL_PATHNAME, &path);
35 if (result)
36 return result;
37
38 result = sprintf(buf, "%s\n", (char *)path.pointer);
39 kfree(path.pointer);
40 return result;
41}
42
43struct acpi_data_node_attr {
44 struct attribute attr;
45 ssize_t (*show)(struct acpi_data_node *, char *);
46 ssize_t (*store)(struct acpi_data_node *, const char *, size_t count);
47};
48
49#define DATA_NODE_ATTR(_name) \
50 static struct acpi_data_node_attr data_node_##_name = \
51 __ATTR(_name, 0444, data_node_show_##_name, NULL)
52
53static ssize_t data_node_show_path(struct acpi_data_node *dn, char *buf)
54{
55 return dn->handle ? acpi_object_path(dn->handle, buf) : 0;
56}
57
58DATA_NODE_ATTR(path);
59
60static struct attribute *acpi_data_node_default_attrs[] = {
61 &data_node_path.attr,
62 NULL
63};
64
65#define to_data_node(k) container_of(k, struct acpi_data_node, kobj)
66#define to_attr(a) container_of(a, struct acpi_data_node_attr, attr)
67
68static ssize_t acpi_data_node_attr_show(struct kobject *kobj,
69 struct attribute *attr, char *buf)
70{
71 struct acpi_data_node *dn = to_data_node(kobj);
72 struct acpi_data_node_attr *dn_attr = to_attr(attr);
73
74 return dn_attr->show ? dn_attr->show(dn, buf) : -ENXIO;
75}
76
77static const struct sysfs_ops acpi_data_node_sysfs_ops = {
78 .show = acpi_data_node_attr_show,
79};
80
81static void acpi_data_node_release(struct kobject *kobj)
82{
83 struct acpi_data_node *dn = to_data_node(kobj);
84 complete(&dn->kobj_done);
85}
86
87static struct kobj_type acpi_data_node_ktype = {
88 .sysfs_ops = &acpi_data_node_sysfs_ops,
89 .default_attrs = acpi_data_node_default_attrs,
90 .release = acpi_data_node_release,
91};
92
93static void acpi_expose_nondev_subnodes(struct kobject *kobj,
94 struct acpi_device_data *data)
95{
96 struct list_head *list = &data->subnodes;
97 struct acpi_data_node *dn;
98
99 if (list_empty(list))
100 return;
101
102 list_for_each_entry(dn, list, sibling) {
103 int ret;
104
105 init_completion(&dn->kobj_done);
106 ret = kobject_init_and_add(&dn->kobj, &acpi_data_node_ktype,
107 kobj, "%s", dn->name);
108 if (!ret)
109 acpi_expose_nondev_subnodes(&dn->kobj, &dn->data);
110 else if (dn->handle)
111 acpi_handle_err(dn->handle, "Failed to expose (%d)\n", ret);
112 }
113}
114
115static void acpi_hide_nondev_subnodes(struct acpi_device_data *data)
116{
117 struct list_head *list = &data->subnodes;
118 struct acpi_data_node *dn;
119
120 if (list_empty(list))
121 return;
122
123 list_for_each_entry_reverse(dn, list, sibling) {
124 acpi_hide_nondev_subnodes(&dn->data);
125 kobject_put(&dn->kobj);
126 }
127}
128
129/**
130 * create_pnp_modalias - Create hid/cid(s) string for modalias and uevent
131 * @acpi_dev: ACPI device object.
132 * @modalias: Buffer to print into.
133 * @size: Size of the buffer.
134 *
135 * Creates hid/cid(s) string needed for modalias and uevent
136 * e.g. on a device with hid:IBM0001 and cid:ACPI0001 you get:
137 * char *modalias: "acpi:IBM0001:ACPI0001"
138 * Return: 0: no _HID and no _CID
139 * -EINVAL: output error
140 * -ENOMEM: output is truncated
141*/
142static int create_pnp_modalias(struct acpi_device *acpi_dev, char *modalias,
143 int size)
144{
145 int len;
146 int count;
147 struct acpi_hardware_id *id;
148
149 /*
150 * Since we skip ACPI_DT_NAMESPACE_HID from the modalias below, 0 should
151 * be returned if ACPI_DT_NAMESPACE_HID is the only ACPI/PNP ID in the
152 * device's list.
153 */
154 count = 0;
155 list_for_each_entry(id, &acpi_dev->pnp.ids, list)
156 if (strcmp(id->id, ACPI_DT_NAMESPACE_HID))
157 count++;
158
159 if (!count)
160 return 0;
161
162 len = snprintf(modalias, size, "acpi:");
163 if (len <= 0)
164 return len;
165
166 size -= len;
167
168 list_for_each_entry(id, &acpi_dev->pnp.ids, list) {
169 if (!strcmp(id->id, ACPI_DT_NAMESPACE_HID))
170 continue;
171
172 count = snprintf(&modalias[len], size, "%s:", id->id);
173 if (count < 0)
174 return -EINVAL;
175
176 if (count >= size)
177 return -ENOMEM;
178
179 len += count;
180 size -= count;
181 }
182 modalias[len] = '\0';
183 return len;
184}
185
186/**
187 * create_of_modalias - Creates DT compatible string for modalias and uevent
188 * @acpi_dev: ACPI device object.
189 * @modalias: Buffer to print into.
190 * @size: Size of the buffer.
191 *
192 * Expose DT compatible modalias as of:NnameTCcompatible. This function should
193 * only be called for devices having ACPI_DT_NAMESPACE_HID in their list of
194 * ACPI/PNP IDs.
195 */
196static int create_of_modalias(struct acpi_device *acpi_dev, char *modalias,
197 int size)
198{
199 struct acpi_buffer buf = { ACPI_ALLOCATE_BUFFER };
200 const union acpi_object *of_compatible, *obj;
201 int len, count;
202 int i, nval;
203 char *c;
204
205 acpi_get_name(acpi_dev->handle, ACPI_SINGLE_NAME, &buf);
206 /* DT strings are all in lower case */
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 { /* Must be ACPI_TYPE_STRING. */
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
240int __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
276/**
277 * acpi_device_uevent_modalias - uevent modalias for ACPI-enumerated devices.
278 *
279 * Create the uevent modalias field for ACPI-enumerated devices.
280 *
281 * Because other buses do not support ACPI HIDs & CIDs, e.g. for a device with
282 * hid:IBM0001 and cid:ACPI0001 you get: "acpi:IBM0001:ACPI0001".
283 */
284int 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}
288EXPORT_SYMBOL_GPL(acpi_device_uevent_modalias);
289
290static 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/**
322 * acpi_device_modalias - modalias sysfs attribute for ACPI-enumerated devices.
323 *
324 * Create the modalias sysfs attribute for ACPI-enumerated devices.
325 *
326 * Because other buses do not support ACPI HIDs & CIDs, e.g. for a device with
327 * hid:IBM0001 and cid:ACPI0001 you get: "acpi:IBM0001:ACPI0001".
328 */
329int acpi_device_modalias(struct device *dev, char *buf, int size)
330{
331 return __acpi_device_modalias(acpi_companion_match(dev), buf, size);
332}
333EXPORT_SYMBOL_GPL(acpi_device_modalias);
334
335static ssize_t
336acpi_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}
340static DEVICE_ATTR(modalias, 0444, acpi_device_modalias_show, NULL);
341
342static 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
356static DEVICE_ATTR(real_power_state, 0444, real_power_state_show, NULL);
357
358static 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
366static DEVICE_ATTR(power_state, 0444, power_state_show, NULL);
367
368static ssize_t
369acpi_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
398static DEVICE_ATTR(eject, 0200, NULL, acpi_eject_store);
399
400static ssize_t
401acpi_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}
407static DEVICE_ATTR(hid, 0444, acpi_device_hid_show, NULL);
408
409static 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}
416static DEVICE_ATTR(uid, 0444, acpi_device_uid_show, NULL);
417
418static 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 return sprintf(buf, "0x%08x\n",
424 (unsigned int)(acpi_dev->pnp.bus_address));
425}
426static DEVICE_ATTR(adr, 0444, acpi_device_adr_show, NULL);
427
428static ssize_t acpi_device_path_show(struct device *dev,
429 struct device_attribute *attr, char *buf)
430{
431 struct acpi_device *acpi_dev = to_acpi_device(dev);
432
433 return acpi_object_path(acpi_dev->handle, buf);
434}
435static DEVICE_ATTR(path, 0444, acpi_device_path_show, NULL);
436
437/* sysfs file that shows description text from the ACPI _STR method */
438static ssize_t description_show(struct device *dev,
439 struct device_attribute *attr,
440 char *buf) {
441 struct acpi_device *acpi_dev = to_acpi_device(dev);
442 int result;
443
444 if (acpi_dev->pnp.str_obj == NULL)
445 return 0;
446
447 /*
448 * The _STR object contains a Unicode identifier for a device.
449 * We need to convert to utf-8 so it can be displayed.
450 */
451 result = utf16s_to_utf8s(
452 (wchar_t *)acpi_dev->pnp.str_obj->buffer.pointer,
453 acpi_dev->pnp.str_obj->buffer.length,
454 UTF16_LITTLE_ENDIAN, buf,
455 PAGE_SIZE);
456
457 buf[result++] = '\n';
458
459 return result;
460}
461static DEVICE_ATTR(description, 0444, description_show, NULL);
462
463static ssize_t
464acpi_device_sun_show(struct device *dev, struct device_attribute *attr,
465 char *buf) {
466 struct acpi_device *acpi_dev = to_acpi_device(dev);
467 acpi_status status;
468 unsigned long long sun;
469
470 status = acpi_evaluate_integer(acpi_dev->handle, "_SUN", NULL, &sun);
471 if (ACPI_FAILURE(status))
472 return -EIO;
473
474 return sprintf(buf, "%llu\n", sun);
475}
476static DEVICE_ATTR(sun, 0444, acpi_device_sun_show, NULL);
477
478static ssize_t
479acpi_device_hrv_show(struct device *dev, struct device_attribute *attr,
480 char *buf) {
481 struct acpi_device *acpi_dev = to_acpi_device(dev);
482 acpi_status status;
483 unsigned long long hrv;
484
485 status = acpi_evaluate_integer(acpi_dev->handle, "_HRV", NULL, &hrv);
486 if (ACPI_FAILURE(status))
487 return -EIO;
488
489 return sprintf(buf, "%llu\n", hrv);
490}
491static DEVICE_ATTR(hrv, 0444, acpi_device_hrv_show, NULL);
492
493static ssize_t status_show(struct device *dev, struct device_attribute *attr,
494 char *buf) {
495 struct acpi_device *acpi_dev = to_acpi_device(dev);
496 acpi_status status;
497 unsigned long long sta;
498
499 status = acpi_evaluate_integer(acpi_dev->handle, "_STA", NULL, &sta);
500 if (ACPI_FAILURE(status))
501 return -EIO;
502
503 return sprintf(buf, "%llu\n", sta);
504}
505static DEVICE_ATTR_RO(status);
506
507/**
508 * acpi_device_setup_files - Create sysfs attributes of an ACPI device.
509 * @dev: ACPI device object.
510 */
511int acpi_device_setup_files(struct acpi_device *dev)
512{
513 struct acpi_buffer buffer = {ACPI_ALLOCATE_BUFFER, NULL};
514 acpi_status status;
515 int result = 0;
516
517 /*
518 * Devices gotten from FADT don't have a "path" attribute
519 */
520 if (dev->handle) {
521 result = device_create_file(&dev->dev, &dev_attr_path);
522 if (result)
523 goto end;
524 }
525
526 if (!list_empty(&dev->pnp.ids)) {
527 result = device_create_file(&dev->dev, &dev_attr_hid);
528 if (result)
529 goto end;
530
531 result = device_create_file(&dev->dev, &dev_attr_modalias);
532 if (result)
533 goto end;
534 }
535
536 /*
537 * If device has _STR, 'description' file is created
538 */
539 if (acpi_has_method(dev->handle, "_STR")) {
540 status = acpi_evaluate_object(dev->handle, "_STR",
541 NULL, &buffer);
542 if (ACPI_FAILURE(status))
543 buffer.pointer = NULL;
544 dev->pnp.str_obj = buffer.pointer;
545 result = device_create_file(&dev->dev, &dev_attr_description);
546 if (result)
547 goto end;
548 }
549
550 if (dev->pnp.type.bus_address)
551 result = device_create_file(&dev->dev, &dev_attr_adr);
552 if (dev->pnp.unique_id)
553 result = device_create_file(&dev->dev, &dev_attr_uid);
554
555 if (acpi_has_method(dev->handle, "_SUN")) {
556 result = device_create_file(&dev->dev, &dev_attr_sun);
557 if (result)
558 goto end;
559 }
560
561 if (acpi_has_method(dev->handle, "_HRV")) {
562 result = device_create_file(&dev->dev, &dev_attr_hrv);
563 if (result)
564 goto end;
565 }
566
567 if (acpi_has_method(dev->handle, "_STA")) {
568 result = device_create_file(&dev->dev, &dev_attr_status);
569 if (result)
570 goto end;
571 }
572
573 /*
574 * If device has _EJ0, 'eject' file is created that is used to trigger
575 * hot-removal function from userland.
576 */
577 if (acpi_has_method(dev->handle, "_EJ0")) {
578 result = device_create_file(&dev->dev, &dev_attr_eject);
579 if (result)
580 return result;
581 }
582
583 if (dev->flags.power_manageable) {
584 result = device_create_file(&dev->dev, &dev_attr_power_state);
585 if (result)
586 return result;
587
588 if (dev->power.flags.power_resources)
589 result = device_create_file(&dev->dev,
590 &dev_attr_real_power_state);
591 }
592
593 acpi_expose_nondev_subnodes(&dev->dev.kobj, &dev->data);
594
595end:
596 return result;
597}
598
599/**
600 * acpi_device_remove_files - Remove sysfs attributes of an ACPI device.
601 * @dev: ACPI device object.
602 */
603void acpi_device_remove_files(struct acpi_device *dev)
604{
605 acpi_hide_nondev_subnodes(&dev->data);
606
607 if (dev->flags.power_manageable) {
608 device_remove_file(&dev->dev, &dev_attr_power_state);
609 if (dev->power.flags.power_resources)
610 device_remove_file(&dev->dev,
611 &dev_attr_real_power_state);
612 }
613
614 /*
615 * If device has _STR, remove 'description' file
616 */
617 if (acpi_has_method(dev->handle, "_STR")) {
618 kfree(dev->pnp.str_obj);
619 device_remove_file(&dev->dev, &dev_attr_description);
620 }
621 /*
622 * If device has _EJ0, remove 'eject' file.
623 */
624 if (acpi_has_method(dev->handle, "_EJ0"))
625 device_remove_file(&dev->dev, &dev_attr_eject);
626
627 if (acpi_has_method(dev->handle, "_SUN"))
628 device_remove_file(&dev->dev, &dev_attr_sun);
629
630 if (acpi_has_method(dev->handle, "_HRV"))
631 device_remove_file(&dev->dev, &dev_attr_hrv);
632
633 if (dev->pnp.unique_id)
634 device_remove_file(&dev->dev, &dev_attr_uid);
635 if (dev->pnp.type.bus_address)
636 device_remove_file(&dev->dev, &dev_attr_adr);
637 device_remove_file(&dev->dev, &dev_attr_modalias);
638 device_remove_file(&dev->dev, &dev_attr_hid);
639 if (acpi_has_method(dev->handle, "_STA"))
640 device_remove_file(&dev->dev, &dev_attr_status);
641 if (dev->handle)
642 device_remove_file(&dev->dev, &dev_attr_path);
643}