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1 | /* | |
2 | * drivers/base/core.c - core driver model code (device registration, etc) | |
3 | * | |
4 | * Copyright (c) 2002-3 Patrick Mochel | |
5 | * Copyright (c) 2002-3 Open Source Development Labs | |
6 | * Copyright (c) 2006 Greg Kroah-Hartman <gregkh@suse.de> | |
7 | * Copyright (c) 2006 Novell, Inc. | |
8 | * | |
9 | * This file is released under the GPLv2 | |
10 | * | |
11 | */ | |
12 | ||
13 | #include <linux/device.h> | |
14 | #include <linux/err.h> | |
15 | #include <linux/fwnode.h> | |
16 | #include <linux/init.h> | |
17 | #include <linux/module.h> | |
18 | #include <linux/slab.h> | |
19 | #include <linux/string.h> | |
20 | #include <linux/kdev_t.h> | |
21 | #include <linux/notifier.h> | |
22 | #include <linux/of.h> | |
23 | #include <linux/of_device.h> | |
24 | #include <linux/genhd.h> | |
25 | #include <linux/kallsyms.h> | |
26 | #include <linux/mutex.h> | |
27 | #include <linux/pm_runtime.h> | |
28 | #include <linux/netdevice.h> | |
29 | #include <linux/sched/signal.h> | |
30 | #include <linux/sysfs.h> | |
31 | ||
32 | #include "base.h" | |
33 | #include "power/power.h" | |
34 | ||
35 | #ifdef CONFIG_SYSFS_DEPRECATED | |
36 | #ifdef CONFIG_SYSFS_DEPRECATED_V2 | |
37 | long sysfs_deprecated = 1; | |
38 | #else | |
39 | long sysfs_deprecated = 0; | |
40 | #endif | |
41 | static int __init sysfs_deprecated_setup(char *arg) | |
42 | { | |
43 | return kstrtol(arg, 10, &sysfs_deprecated); | |
44 | } | |
45 | early_param("sysfs.deprecated", sysfs_deprecated_setup); | |
46 | #endif | |
47 | ||
48 | /* Device links support. */ | |
49 | ||
50 | #ifdef CONFIG_SRCU | |
51 | static DEFINE_MUTEX(device_links_lock); | |
52 | DEFINE_STATIC_SRCU(device_links_srcu); | |
53 | ||
54 | static inline void device_links_write_lock(void) | |
55 | { | |
56 | mutex_lock(&device_links_lock); | |
57 | } | |
58 | ||
59 | static inline void device_links_write_unlock(void) | |
60 | { | |
61 | mutex_unlock(&device_links_lock); | |
62 | } | |
63 | ||
64 | int device_links_read_lock(void) | |
65 | { | |
66 | return srcu_read_lock(&device_links_srcu); | |
67 | } | |
68 | ||
69 | void device_links_read_unlock(int idx) | |
70 | { | |
71 | srcu_read_unlock(&device_links_srcu, idx); | |
72 | } | |
73 | #else /* !CONFIG_SRCU */ | |
74 | static DECLARE_RWSEM(device_links_lock); | |
75 | ||
76 | static inline void device_links_write_lock(void) | |
77 | { | |
78 | down_write(&device_links_lock); | |
79 | } | |
80 | ||
81 | static inline void device_links_write_unlock(void) | |
82 | { | |
83 | up_write(&device_links_lock); | |
84 | } | |
85 | ||
86 | int device_links_read_lock(void) | |
87 | { | |
88 | down_read(&device_links_lock); | |
89 | return 0; | |
90 | } | |
91 | ||
92 | void device_links_read_unlock(int not_used) | |
93 | { | |
94 | up_read(&device_links_lock); | |
95 | } | |
96 | #endif /* !CONFIG_SRCU */ | |
97 | ||
98 | /** | |
99 | * device_is_dependent - Check if one device depends on another one | |
100 | * @dev: Device to check dependencies for. | |
101 | * @target: Device to check against. | |
102 | * | |
103 | * Check if @target depends on @dev or any device dependent on it (its child or | |
104 | * its consumer etc). Return 1 if that is the case or 0 otherwise. | |
105 | */ | |
106 | static int device_is_dependent(struct device *dev, void *target) | |
107 | { | |
108 | struct device_link *link; | |
109 | int ret; | |
110 | ||
111 | if (WARN_ON(dev == target)) | |
112 | return 1; | |
113 | ||
114 | ret = device_for_each_child(dev, target, device_is_dependent); | |
115 | if (ret) | |
116 | return ret; | |
117 | ||
118 | list_for_each_entry(link, &dev->links.consumers, s_node) { | |
119 | if (WARN_ON(link->consumer == target)) | |
120 | return 1; | |
121 | ||
122 | ret = device_is_dependent(link->consumer, target); | |
123 | if (ret) | |
124 | break; | |
125 | } | |
126 | return ret; | |
127 | } | |
128 | ||
129 | static int device_reorder_to_tail(struct device *dev, void *not_used) | |
130 | { | |
131 | struct device_link *link; | |
132 | ||
133 | /* | |
134 | * Devices that have not been registered yet will be put to the ends | |
135 | * of the lists during the registration, so skip them here. | |
136 | */ | |
137 | if (device_is_registered(dev)) | |
138 | devices_kset_move_last(dev); | |
139 | ||
140 | if (device_pm_initialized(dev)) | |
141 | device_pm_move_last(dev); | |
142 | ||
143 | device_for_each_child(dev, NULL, device_reorder_to_tail); | |
144 | list_for_each_entry(link, &dev->links.consumers, s_node) | |
145 | device_reorder_to_tail(link->consumer, NULL); | |
146 | ||
147 | return 0; | |
148 | } | |
149 | ||
150 | /** | |
151 | * device_link_add - Create a link between two devices. | |
152 | * @consumer: Consumer end of the link. | |
153 | * @supplier: Supplier end of the link. | |
154 | * @flags: Link flags. | |
155 | * | |
156 | * The caller is responsible for the proper synchronization of the link creation | |
157 | * with runtime PM. First, setting the DL_FLAG_PM_RUNTIME flag will cause the | |
158 | * runtime PM framework to take the link into account. Second, if the | |
159 | * DL_FLAG_RPM_ACTIVE flag is set in addition to it, the supplier devices will | |
160 | * be forced into the active metastate and reference-counted upon the creation | |
161 | * of the link. If DL_FLAG_PM_RUNTIME is not set, DL_FLAG_RPM_ACTIVE will be | |
162 | * ignored. | |
163 | * | |
164 | * If the DL_FLAG_AUTOREMOVE is set, the link will be removed automatically | |
165 | * when the consumer device driver unbinds from it. The combination of both | |
166 | * DL_FLAG_AUTOREMOVE and DL_FLAG_STATELESS set is invalid and will cause NULL | |
167 | * to be returned. | |
168 | * | |
169 | * A side effect of the link creation is re-ordering of dpm_list and the | |
170 | * devices_kset list by moving the consumer device and all devices depending | |
171 | * on it to the ends of these lists (that does not happen to devices that have | |
172 | * not been registered when this function is called). | |
173 | * | |
174 | * The supplier device is required to be registered when this function is called | |
175 | * and NULL will be returned if that is not the case. The consumer device need | |
176 | * not be registered, however. | |
177 | */ | |
178 | struct device_link *device_link_add(struct device *consumer, | |
179 | struct device *supplier, u32 flags) | |
180 | { | |
181 | struct device_link *link; | |
182 | ||
183 | if (!consumer || !supplier || | |
184 | ((flags & DL_FLAG_STATELESS) && (flags & DL_FLAG_AUTOREMOVE))) | |
185 | return NULL; | |
186 | ||
187 | device_links_write_lock(); | |
188 | device_pm_lock(); | |
189 | ||
190 | /* | |
191 | * If the supplier has not been fully registered yet or there is a | |
192 | * reverse dependency between the consumer and the supplier already in | |
193 | * the graph, return NULL. | |
194 | */ | |
195 | if (!device_pm_initialized(supplier) | |
196 | || device_is_dependent(consumer, supplier)) { | |
197 | link = NULL; | |
198 | goto out; | |
199 | } | |
200 | ||
201 | list_for_each_entry(link, &supplier->links.consumers, s_node) | |
202 | if (link->consumer == consumer) | |
203 | goto out; | |
204 | ||
205 | link = kzalloc(sizeof(*link), GFP_KERNEL); | |
206 | if (!link) | |
207 | goto out; | |
208 | ||
209 | if (flags & DL_FLAG_PM_RUNTIME) { | |
210 | if (flags & DL_FLAG_RPM_ACTIVE) { | |
211 | if (pm_runtime_get_sync(supplier) < 0) { | |
212 | pm_runtime_put_noidle(supplier); | |
213 | kfree(link); | |
214 | link = NULL; | |
215 | goto out; | |
216 | } | |
217 | link->rpm_active = true; | |
218 | } | |
219 | pm_runtime_new_link(consumer); | |
220 | } | |
221 | get_device(supplier); | |
222 | link->supplier = supplier; | |
223 | INIT_LIST_HEAD(&link->s_node); | |
224 | get_device(consumer); | |
225 | link->consumer = consumer; | |
226 | INIT_LIST_HEAD(&link->c_node); | |
227 | link->flags = flags; | |
228 | ||
229 | /* Determine the initial link state. */ | |
230 | if (flags & DL_FLAG_STATELESS) { | |
231 | link->status = DL_STATE_NONE; | |
232 | } else { | |
233 | switch (supplier->links.status) { | |
234 | case DL_DEV_DRIVER_BOUND: | |
235 | switch (consumer->links.status) { | |
236 | case DL_DEV_PROBING: | |
237 | /* | |
238 | * Balance the decrementation of the supplier's | |
239 | * runtime PM usage counter after consumer probe | |
240 | * in driver_probe_device(). | |
241 | */ | |
242 | if (flags & DL_FLAG_PM_RUNTIME) | |
243 | pm_runtime_get_sync(supplier); | |
244 | ||
245 | link->status = DL_STATE_CONSUMER_PROBE; | |
246 | break; | |
247 | case DL_DEV_DRIVER_BOUND: | |
248 | link->status = DL_STATE_ACTIVE; | |
249 | break; | |
250 | default: | |
251 | link->status = DL_STATE_AVAILABLE; | |
252 | break; | |
253 | } | |
254 | break; | |
255 | case DL_DEV_UNBINDING: | |
256 | link->status = DL_STATE_SUPPLIER_UNBIND; | |
257 | break; | |
258 | default: | |
259 | link->status = DL_STATE_DORMANT; | |
260 | break; | |
261 | } | |
262 | } | |
263 | ||
264 | /* | |
265 | * Move the consumer and all of the devices depending on it to the end | |
266 | * of dpm_list and the devices_kset list. | |
267 | * | |
268 | * It is necessary to hold dpm_list locked throughout all that or else | |
269 | * we may end up suspending with a wrong ordering of it. | |
270 | */ | |
271 | device_reorder_to_tail(consumer, NULL); | |
272 | ||
273 | list_add_tail_rcu(&link->s_node, &supplier->links.consumers); | |
274 | list_add_tail_rcu(&link->c_node, &consumer->links.suppliers); | |
275 | ||
276 | dev_info(consumer, "Linked as a consumer to %s\n", dev_name(supplier)); | |
277 | ||
278 | out: | |
279 | device_pm_unlock(); | |
280 | device_links_write_unlock(); | |
281 | return link; | |
282 | } | |
283 | EXPORT_SYMBOL_GPL(device_link_add); | |
284 | ||
285 | static void device_link_free(struct device_link *link) | |
286 | { | |
287 | put_device(link->consumer); | |
288 | put_device(link->supplier); | |
289 | kfree(link); | |
290 | } | |
291 | ||
292 | #ifdef CONFIG_SRCU | |
293 | static void __device_link_free_srcu(struct rcu_head *rhead) | |
294 | { | |
295 | device_link_free(container_of(rhead, struct device_link, rcu_head)); | |
296 | } | |
297 | ||
298 | static void __device_link_del(struct device_link *link) | |
299 | { | |
300 | dev_info(link->consumer, "Dropping the link to %s\n", | |
301 | dev_name(link->supplier)); | |
302 | ||
303 | if (link->flags & DL_FLAG_PM_RUNTIME) | |
304 | pm_runtime_drop_link(link->consumer); | |
305 | ||
306 | list_del_rcu(&link->s_node); | |
307 | list_del_rcu(&link->c_node); | |
308 | call_srcu(&device_links_srcu, &link->rcu_head, __device_link_free_srcu); | |
309 | } | |
310 | #else /* !CONFIG_SRCU */ | |
311 | static void __device_link_del(struct device_link *link) | |
312 | { | |
313 | dev_info(link->consumer, "Dropping the link to %s\n", | |
314 | dev_name(link->supplier)); | |
315 | ||
316 | if (link->flags & DL_FLAG_PM_RUNTIME) | |
317 | pm_runtime_drop_link(link->consumer); | |
318 | ||
319 | list_del(&link->s_node); | |
320 | list_del(&link->c_node); | |
321 | device_link_free(link); | |
322 | } | |
323 | #endif /* !CONFIG_SRCU */ | |
324 | ||
325 | /** | |
326 | * device_link_del - Delete a link between two devices. | |
327 | * @link: Device link to delete. | |
328 | * | |
329 | * The caller must ensure proper synchronization of this function with runtime | |
330 | * PM. | |
331 | */ | |
332 | void device_link_del(struct device_link *link) | |
333 | { | |
334 | device_links_write_lock(); | |
335 | device_pm_lock(); | |
336 | __device_link_del(link); | |
337 | device_pm_unlock(); | |
338 | device_links_write_unlock(); | |
339 | } | |
340 | EXPORT_SYMBOL_GPL(device_link_del); | |
341 | ||
342 | static void device_links_missing_supplier(struct device *dev) | |
343 | { | |
344 | struct device_link *link; | |
345 | ||
346 | list_for_each_entry(link, &dev->links.suppliers, c_node) | |
347 | if (link->status == DL_STATE_CONSUMER_PROBE) | |
348 | WRITE_ONCE(link->status, DL_STATE_AVAILABLE); | |
349 | } | |
350 | ||
351 | /** | |
352 | * device_links_check_suppliers - Check presence of supplier drivers. | |
353 | * @dev: Consumer device. | |
354 | * | |
355 | * Check links from this device to any suppliers. Walk the list of the device's | |
356 | * links to suppliers and see if all of them are available. If not, simply | |
357 | * return -EPROBE_DEFER. | |
358 | * | |
359 | * We need to guarantee that the supplier will not go away after the check has | |
360 | * been positive here. It only can go away in __device_release_driver() and | |
361 | * that function checks the device's links to consumers. This means we need to | |
362 | * mark the link as "consumer probe in progress" to make the supplier removal | |
363 | * wait for us to complete (or bad things may happen). | |
364 | * | |
365 | * Links with the DL_FLAG_STATELESS flag set are ignored. | |
366 | */ | |
367 | int device_links_check_suppliers(struct device *dev) | |
368 | { | |
369 | struct device_link *link; | |
370 | int ret = 0; | |
371 | ||
372 | device_links_write_lock(); | |
373 | ||
374 | list_for_each_entry(link, &dev->links.suppliers, c_node) { | |
375 | if (link->flags & DL_FLAG_STATELESS) | |
376 | continue; | |
377 | ||
378 | if (link->status != DL_STATE_AVAILABLE) { | |
379 | device_links_missing_supplier(dev); | |
380 | ret = -EPROBE_DEFER; | |
381 | break; | |
382 | } | |
383 | WRITE_ONCE(link->status, DL_STATE_CONSUMER_PROBE); | |
384 | } | |
385 | dev->links.status = DL_DEV_PROBING; | |
386 | ||
387 | device_links_write_unlock(); | |
388 | return ret; | |
389 | } | |
390 | ||
391 | /** | |
392 | * device_links_driver_bound - Update device links after probing its driver. | |
393 | * @dev: Device to update the links for. | |
394 | * | |
395 | * The probe has been successful, so update links from this device to any | |
396 | * consumers by changing their status to "available". | |
397 | * | |
398 | * Also change the status of @dev's links to suppliers to "active". | |
399 | * | |
400 | * Links with the DL_FLAG_STATELESS flag set are ignored. | |
401 | */ | |
402 | void device_links_driver_bound(struct device *dev) | |
403 | { | |
404 | struct device_link *link; | |
405 | ||
406 | device_links_write_lock(); | |
407 | ||
408 | list_for_each_entry(link, &dev->links.consumers, s_node) { | |
409 | if (link->flags & DL_FLAG_STATELESS) | |
410 | continue; | |
411 | ||
412 | WARN_ON(link->status != DL_STATE_DORMANT); | |
413 | WRITE_ONCE(link->status, DL_STATE_AVAILABLE); | |
414 | } | |
415 | ||
416 | list_for_each_entry(link, &dev->links.suppliers, c_node) { | |
417 | if (link->flags & DL_FLAG_STATELESS) | |
418 | continue; | |
419 | ||
420 | WARN_ON(link->status != DL_STATE_CONSUMER_PROBE); | |
421 | WRITE_ONCE(link->status, DL_STATE_ACTIVE); | |
422 | } | |
423 | ||
424 | dev->links.status = DL_DEV_DRIVER_BOUND; | |
425 | ||
426 | device_links_write_unlock(); | |
427 | } | |
428 | ||
429 | /** | |
430 | * __device_links_no_driver - Update links of a device without a driver. | |
431 | * @dev: Device without a drvier. | |
432 | * | |
433 | * Delete all non-persistent links from this device to any suppliers. | |
434 | * | |
435 | * Persistent links stay around, but their status is changed to "available", | |
436 | * unless they already are in the "supplier unbind in progress" state in which | |
437 | * case they need not be updated. | |
438 | * | |
439 | * Links with the DL_FLAG_STATELESS flag set are ignored. | |
440 | */ | |
441 | static void __device_links_no_driver(struct device *dev) | |
442 | { | |
443 | struct device_link *link, *ln; | |
444 | ||
445 | list_for_each_entry_safe_reverse(link, ln, &dev->links.suppliers, c_node) { | |
446 | if (link->flags & DL_FLAG_STATELESS) | |
447 | continue; | |
448 | ||
449 | if (link->flags & DL_FLAG_AUTOREMOVE) | |
450 | __device_link_del(link); | |
451 | else if (link->status != DL_STATE_SUPPLIER_UNBIND) | |
452 | WRITE_ONCE(link->status, DL_STATE_AVAILABLE); | |
453 | } | |
454 | ||
455 | dev->links.status = DL_DEV_NO_DRIVER; | |
456 | } | |
457 | ||
458 | void device_links_no_driver(struct device *dev) | |
459 | { | |
460 | device_links_write_lock(); | |
461 | __device_links_no_driver(dev); | |
462 | device_links_write_unlock(); | |
463 | } | |
464 | ||
465 | /** | |
466 | * device_links_driver_cleanup - Update links after driver removal. | |
467 | * @dev: Device whose driver has just gone away. | |
468 | * | |
469 | * Update links to consumers for @dev by changing their status to "dormant" and | |
470 | * invoke %__device_links_no_driver() to update links to suppliers for it as | |
471 | * appropriate. | |
472 | * | |
473 | * Links with the DL_FLAG_STATELESS flag set are ignored. | |
474 | */ | |
475 | void device_links_driver_cleanup(struct device *dev) | |
476 | { | |
477 | struct device_link *link; | |
478 | ||
479 | device_links_write_lock(); | |
480 | ||
481 | list_for_each_entry(link, &dev->links.consumers, s_node) { | |
482 | if (link->flags & DL_FLAG_STATELESS) | |
483 | continue; | |
484 | ||
485 | WARN_ON(link->flags & DL_FLAG_AUTOREMOVE); | |
486 | WARN_ON(link->status != DL_STATE_SUPPLIER_UNBIND); | |
487 | WRITE_ONCE(link->status, DL_STATE_DORMANT); | |
488 | } | |
489 | ||
490 | __device_links_no_driver(dev); | |
491 | ||
492 | device_links_write_unlock(); | |
493 | } | |
494 | ||
495 | /** | |
496 | * device_links_busy - Check if there are any busy links to consumers. | |
497 | * @dev: Device to check. | |
498 | * | |
499 | * Check each consumer of the device and return 'true' if its link's status | |
500 | * is one of "consumer probe" or "active" (meaning that the given consumer is | |
501 | * probing right now or its driver is present). Otherwise, change the link | |
502 | * state to "supplier unbind" to prevent the consumer from being probed | |
503 | * successfully going forward. | |
504 | * | |
505 | * Return 'false' if there are no probing or active consumers. | |
506 | * | |
507 | * Links with the DL_FLAG_STATELESS flag set are ignored. | |
508 | */ | |
509 | bool device_links_busy(struct device *dev) | |
510 | { | |
511 | struct device_link *link; | |
512 | bool ret = false; | |
513 | ||
514 | device_links_write_lock(); | |
515 | ||
516 | list_for_each_entry(link, &dev->links.consumers, s_node) { | |
517 | if (link->flags & DL_FLAG_STATELESS) | |
518 | continue; | |
519 | ||
520 | if (link->status == DL_STATE_CONSUMER_PROBE | |
521 | || link->status == DL_STATE_ACTIVE) { | |
522 | ret = true; | |
523 | break; | |
524 | } | |
525 | WRITE_ONCE(link->status, DL_STATE_SUPPLIER_UNBIND); | |
526 | } | |
527 | ||
528 | dev->links.status = DL_DEV_UNBINDING; | |
529 | ||
530 | device_links_write_unlock(); | |
531 | return ret; | |
532 | } | |
533 | ||
534 | /** | |
535 | * device_links_unbind_consumers - Force unbind consumers of the given device. | |
536 | * @dev: Device to unbind the consumers of. | |
537 | * | |
538 | * Walk the list of links to consumers for @dev and if any of them is in the | |
539 | * "consumer probe" state, wait for all device probes in progress to complete | |
540 | * and start over. | |
541 | * | |
542 | * If that's not the case, change the status of the link to "supplier unbind" | |
543 | * and check if the link was in the "active" state. If so, force the consumer | |
544 | * driver to unbind and start over (the consumer will not re-probe as we have | |
545 | * changed the state of the link already). | |
546 | * | |
547 | * Links with the DL_FLAG_STATELESS flag set are ignored. | |
548 | */ | |
549 | void device_links_unbind_consumers(struct device *dev) | |
550 | { | |
551 | struct device_link *link; | |
552 | ||
553 | start: | |
554 | device_links_write_lock(); | |
555 | ||
556 | list_for_each_entry(link, &dev->links.consumers, s_node) { | |
557 | enum device_link_state status; | |
558 | ||
559 | if (link->flags & DL_FLAG_STATELESS) | |
560 | continue; | |
561 | ||
562 | status = link->status; | |
563 | if (status == DL_STATE_CONSUMER_PROBE) { | |
564 | device_links_write_unlock(); | |
565 | ||
566 | wait_for_device_probe(); | |
567 | goto start; | |
568 | } | |
569 | WRITE_ONCE(link->status, DL_STATE_SUPPLIER_UNBIND); | |
570 | if (status == DL_STATE_ACTIVE) { | |
571 | struct device *consumer = link->consumer; | |
572 | ||
573 | get_device(consumer); | |
574 | ||
575 | device_links_write_unlock(); | |
576 | ||
577 | device_release_driver_internal(consumer, NULL, | |
578 | consumer->parent); | |
579 | put_device(consumer); | |
580 | goto start; | |
581 | } | |
582 | } | |
583 | ||
584 | device_links_write_unlock(); | |
585 | } | |
586 | ||
587 | /** | |
588 | * device_links_purge - Delete existing links to other devices. | |
589 | * @dev: Target device. | |
590 | */ | |
591 | static void device_links_purge(struct device *dev) | |
592 | { | |
593 | struct device_link *link, *ln; | |
594 | ||
595 | /* | |
596 | * Delete all of the remaining links from this device to any other | |
597 | * devices (either consumers or suppliers). | |
598 | */ | |
599 | device_links_write_lock(); | |
600 | ||
601 | list_for_each_entry_safe_reverse(link, ln, &dev->links.suppliers, c_node) { | |
602 | WARN_ON(link->status == DL_STATE_ACTIVE); | |
603 | __device_link_del(link); | |
604 | } | |
605 | ||
606 | list_for_each_entry_safe_reverse(link, ln, &dev->links.consumers, s_node) { | |
607 | WARN_ON(link->status != DL_STATE_DORMANT && | |
608 | link->status != DL_STATE_NONE); | |
609 | __device_link_del(link); | |
610 | } | |
611 | ||
612 | device_links_write_unlock(); | |
613 | } | |
614 | ||
615 | /* Device links support end. */ | |
616 | ||
617 | int (*platform_notify)(struct device *dev) = NULL; | |
618 | int (*platform_notify_remove)(struct device *dev) = NULL; | |
619 | static struct kobject *dev_kobj; | |
620 | struct kobject *sysfs_dev_char_kobj; | |
621 | struct kobject *sysfs_dev_block_kobj; | |
622 | ||
623 | static DEFINE_MUTEX(device_hotplug_lock); | |
624 | ||
625 | void lock_device_hotplug(void) | |
626 | { | |
627 | mutex_lock(&device_hotplug_lock); | |
628 | } | |
629 | ||
630 | void unlock_device_hotplug(void) | |
631 | { | |
632 | mutex_unlock(&device_hotplug_lock); | |
633 | } | |
634 | ||
635 | int lock_device_hotplug_sysfs(void) | |
636 | { | |
637 | if (mutex_trylock(&device_hotplug_lock)) | |
638 | return 0; | |
639 | ||
640 | /* Avoid busy looping (5 ms of sleep should do). */ | |
641 | msleep(5); | |
642 | return restart_syscall(); | |
643 | } | |
644 | ||
645 | #ifdef CONFIG_BLOCK | |
646 | static inline int device_is_not_partition(struct device *dev) | |
647 | { | |
648 | return !(dev->type == &part_type); | |
649 | } | |
650 | #else | |
651 | static inline int device_is_not_partition(struct device *dev) | |
652 | { | |
653 | return 1; | |
654 | } | |
655 | #endif | |
656 | ||
657 | /** | |
658 | * dev_driver_string - Return a device's driver name, if at all possible | |
659 | * @dev: struct device to get the name of | |
660 | * | |
661 | * Will return the device's driver's name if it is bound to a device. If | |
662 | * the device is not bound to a driver, it will return the name of the bus | |
663 | * it is attached to. If it is not attached to a bus either, an empty | |
664 | * string will be returned. | |
665 | */ | |
666 | const char *dev_driver_string(const struct device *dev) | |
667 | { | |
668 | struct device_driver *drv; | |
669 | ||
670 | /* dev->driver can change to NULL underneath us because of unbinding, | |
671 | * so be careful about accessing it. dev->bus and dev->class should | |
672 | * never change once they are set, so they don't need special care. | |
673 | */ | |
674 | drv = READ_ONCE(dev->driver); | |
675 | return drv ? drv->name : | |
676 | (dev->bus ? dev->bus->name : | |
677 | (dev->class ? dev->class->name : "")); | |
678 | } | |
679 | EXPORT_SYMBOL(dev_driver_string); | |
680 | ||
681 | #define to_dev_attr(_attr) container_of(_attr, struct device_attribute, attr) | |
682 | ||
683 | static ssize_t dev_attr_show(struct kobject *kobj, struct attribute *attr, | |
684 | char *buf) | |
685 | { | |
686 | struct device_attribute *dev_attr = to_dev_attr(attr); | |
687 | struct device *dev = kobj_to_dev(kobj); | |
688 | ssize_t ret = -EIO; | |
689 | ||
690 | if (dev_attr->show) | |
691 | ret = dev_attr->show(dev, dev_attr, buf); | |
692 | if (ret >= (ssize_t)PAGE_SIZE) { | |
693 | print_symbol("dev_attr_show: %s returned bad count\n", | |
694 | (unsigned long)dev_attr->show); | |
695 | } | |
696 | return ret; | |
697 | } | |
698 | ||
699 | static ssize_t dev_attr_store(struct kobject *kobj, struct attribute *attr, | |
700 | const char *buf, size_t count) | |
701 | { | |
702 | struct device_attribute *dev_attr = to_dev_attr(attr); | |
703 | struct device *dev = kobj_to_dev(kobj); | |
704 | ssize_t ret = -EIO; | |
705 | ||
706 | if (dev_attr->store) | |
707 | ret = dev_attr->store(dev, dev_attr, buf, count); | |
708 | return ret; | |
709 | } | |
710 | ||
711 | static const struct sysfs_ops dev_sysfs_ops = { | |
712 | .show = dev_attr_show, | |
713 | .store = dev_attr_store, | |
714 | }; | |
715 | ||
716 | #define to_ext_attr(x) container_of(x, struct dev_ext_attribute, attr) | |
717 | ||
718 | ssize_t device_store_ulong(struct device *dev, | |
719 | struct device_attribute *attr, | |
720 | const char *buf, size_t size) | |
721 | { | |
722 | struct dev_ext_attribute *ea = to_ext_attr(attr); | |
723 | char *end; | |
724 | unsigned long new = simple_strtoul(buf, &end, 0); | |
725 | if (end == buf) | |
726 | return -EINVAL; | |
727 | *(unsigned long *)(ea->var) = new; | |
728 | /* Always return full write size even if we didn't consume all */ | |
729 | return size; | |
730 | } | |
731 | EXPORT_SYMBOL_GPL(device_store_ulong); | |
732 | ||
733 | ssize_t device_show_ulong(struct device *dev, | |
734 | struct device_attribute *attr, | |
735 | char *buf) | |
736 | { | |
737 | struct dev_ext_attribute *ea = to_ext_attr(attr); | |
738 | return snprintf(buf, PAGE_SIZE, "%lx\n", *(unsigned long *)(ea->var)); | |
739 | } | |
740 | EXPORT_SYMBOL_GPL(device_show_ulong); | |
741 | ||
742 | ssize_t device_store_int(struct device *dev, | |
743 | struct device_attribute *attr, | |
744 | const char *buf, size_t size) | |
745 | { | |
746 | struct dev_ext_attribute *ea = to_ext_attr(attr); | |
747 | char *end; | |
748 | long new = simple_strtol(buf, &end, 0); | |
749 | if (end == buf || new > INT_MAX || new < INT_MIN) | |
750 | return -EINVAL; | |
751 | *(int *)(ea->var) = new; | |
752 | /* Always return full write size even if we didn't consume all */ | |
753 | return size; | |
754 | } | |
755 | EXPORT_SYMBOL_GPL(device_store_int); | |
756 | ||
757 | ssize_t device_show_int(struct device *dev, | |
758 | struct device_attribute *attr, | |
759 | char *buf) | |
760 | { | |
761 | struct dev_ext_attribute *ea = to_ext_attr(attr); | |
762 | ||
763 | return snprintf(buf, PAGE_SIZE, "%d\n", *(int *)(ea->var)); | |
764 | } | |
765 | EXPORT_SYMBOL_GPL(device_show_int); | |
766 | ||
767 | ssize_t device_store_bool(struct device *dev, struct device_attribute *attr, | |
768 | const char *buf, size_t size) | |
769 | { | |
770 | struct dev_ext_attribute *ea = to_ext_attr(attr); | |
771 | ||
772 | if (strtobool(buf, ea->var) < 0) | |
773 | return -EINVAL; | |
774 | ||
775 | return size; | |
776 | } | |
777 | EXPORT_SYMBOL_GPL(device_store_bool); | |
778 | ||
779 | ssize_t device_show_bool(struct device *dev, struct device_attribute *attr, | |
780 | char *buf) | |
781 | { | |
782 | struct dev_ext_attribute *ea = to_ext_attr(attr); | |
783 | ||
784 | return snprintf(buf, PAGE_SIZE, "%d\n", *(bool *)(ea->var)); | |
785 | } | |
786 | EXPORT_SYMBOL_GPL(device_show_bool); | |
787 | ||
788 | /** | |
789 | * device_release - free device structure. | |
790 | * @kobj: device's kobject. | |
791 | * | |
792 | * This is called once the reference count for the object | |
793 | * reaches 0. We forward the call to the device's release | |
794 | * method, which should handle actually freeing the structure. | |
795 | */ | |
796 | static void device_release(struct kobject *kobj) | |
797 | { | |
798 | struct device *dev = kobj_to_dev(kobj); | |
799 | struct device_private *p = dev->p; | |
800 | ||
801 | /* | |
802 | * Some platform devices are driven without driver attached | |
803 | * and managed resources may have been acquired. Make sure | |
804 | * all resources are released. | |
805 | * | |
806 | * Drivers still can add resources into device after device | |
807 | * is deleted but alive, so release devres here to avoid | |
808 | * possible memory leak. | |
809 | */ | |
810 | devres_release_all(dev); | |
811 | ||
812 | if (dev->release) | |
813 | dev->release(dev); | |
814 | else if (dev->type && dev->type->release) | |
815 | dev->type->release(dev); | |
816 | else if (dev->class && dev->class->dev_release) | |
817 | dev->class->dev_release(dev); | |
818 | else | |
819 | WARN(1, KERN_ERR "Device '%s' does not have a release() " | |
820 | "function, it is broken and must be fixed.\n", | |
821 | dev_name(dev)); | |
822 | kfree(p); | |
823 | } | |
824 | ||
825 | static const void *device_namespace(struct kobject *kobj) | |
826 | { | |
827 | struct device *dev = kobj_to_dev(kobj); | |
828 | const void *ns = NULL; | |
829 | ||
830 | if (dev->class && dev->class->ns_type) | |
831 | ns = dev->class->namespace(dev); | |
832 | ||
833 | return ns; | |
834 | } | |
835 | ||
836 | static struct kobj_type device_ktype = { | |
837 | .release = device_release, | |
838 | .sysfs_ops = &dev_sysfs_ops, | |
839 | .namespace = device_namespace, | |
840 | }; | |
841 | ||
842 | ||
843 | static int dev_uevent_filter(struct kset *kset, struct kobject *kobj) | |
844 | { | |
845 | struct kobj_type *ktype = get_ktype(kobj); | |
846 | ||
847 | if (ktype == &device_ktype) { | |
848 | struct device *dev = kobj_to_dev(kobj); | |
849 | if (dev->bus) | |
850 | return 1; | |
851 | if (dev->class) | |
852 | return 1; | |
853 | } | |
854 | return 0; | |
855 | } | |
856 | ||
857 | static const char *dev_uevent_name(struct kset *kset, struct kobject *kobj) | |
858 | { | |
859 | struct device *dev = kobj_to_dev(kobj); | |
860 | ||
861 | if (dev->bus) | |
862 | return dev->bus->name; | |
863 | if (dev->class) | |
864 | return dev->class->name; | |
865 | return NULL; | |
866 | } | |
867 | ||
868 | static int dev_uevent(struct kset *kset, struct kobject *kobj, | |
869 | struct kobj_uevent_env *env) | |
870 | { | |
871 | struct device *dev = kobj_to_dev(kobj); | |
872 | int retval = 0; | |
873 | ||
874 | /* add device node properties if present */ | |
875 | if (MAJOR(dev->devt)) { | |
876 | const char *tmp; | |
877 | const char *name; | |
878 | umode_t mode = 0; | |
879 | kuid_t uid = GLOBAL_ROOT_UID; | |
880 | kgid_t gid = GLOBAL_ROOT_GID; | |
881 | ||
882 | add_uevent_var(env, "MAJOR=%u", MAJOR(dev->devt)); | |
883 | add_uevent_var(env, "MINOR=%u", MINOR(dev->devt)); | |
884 | name = device_get_devnode(dev, &mode, &uid, &gid, &tmp); | |
885 | if (name) { | |
886 | add_uevent_var(env, "DEVNAME=%s", name); | |
887 | if (mode) | |
888 | add_uevent_var(env, "DEVMODE=%#o", mode & 0777); | |
889 | if (!uid_eq(uid, GLOBAL_ROOT_UID)) | |
890 | add_uevent_var(env, "DEVUID=%u", from_kuid(&init_user_ns, uid)); | |
891 | if (!gid_eq(gid, GLOBAL_ROOT_GID)) | |
892 | add_uevent_var(env, "DEVGID=%u", from_kgid(&init_user_ns, gid)); | |
893 | kfree(tmp); | |
894 | } | |
895 | } | |
896 | ||
897 | if (dev->type && dev->type->name) | |
898 | add_uevent_var(env, "DEVTYPE=%s", dev->type->name); | |
899 | ||
900 | if (dev->driver) | |
901 | add_uevent_var(env, "DRIVER=%s", dev->driver->name); | |
902 | ||
903 | /* Add common DT information about the device */ | |
904 | of_device_uevent(dev, env); | |
905 | ||
906 | /* have the bus specific function add its stuff */ | |
907 | if (dev->bus && dev->bus->uevent) { | |
908 | retval = dev->bus->uevent(dev, env); | |
909 | if (retval) | |
910 | pr_debug("device: '%s': %s: bus uevent() returned %d\n", | |
911 | dev_name(dev), __func__, retval); | |
912 | } | |
913 | ||
914 | /* have the class specific function add its stuff */ | |
915 | if (dev->class && dev->class->dev_uevent) { | |
916 | retval = dev->class->dev_uevent(dev, env); | |
917 | if (retval) | |
918 | pr_debug("device: '%s': %s: class uevent() " | |
919 | "returned %d\n", dev_name(dev), | |
920 | __func__, retval); | |
921 | } | |
922 | ||
923 | /* have the device type specific function add its stuff */ | |
924 | if (dev->type && dev->type->uevent) { | |
925 | retval = dev->type->uevent(dev, env); | |
926 | if (retval) | |
927 | pr_debug("device: '%s': %s: dev_type uevent() " | |
928 | "returned %d\n", dev_name(dev), | |
929 | __func__, retval); | |
930 | } | |
931 | ||
932 | return retval; | |
933 | } | |
934 | ||
935 | static const struct kset_uevent_ops device_uevent_ops = { | |
936 | .filter = dev_uevent_filter, | |
937 | .name = dev_uevent_name, | |
938 | .uevent = dev_uevent, | |
939 | }; | |
940 | ||
941 | static ssize_t uevent_show(struct device *dev, struct device_attribute *attr, | |
942 | char *buf) | |
943 | { | |
944 | struct kobject *top_kobj; | |
945 | struct kset *kset; | |
946 | struct kobj_uevent_env *env = NULL; | |
947 | int i; | |
948 | size_t count = 0; | |
949 | int retval; | |
950 | ||
951 | /* search the kset, the device belongs to */ | |
952 | top_kobj = &dev->kobj; | |
953 | while (!top_kobj->kset && top_kobj->parent) | |
954 | top_kobj = top_kobj->parent; | |
955 | if (!top_kobj->kset) | |
956 | goto out; | |
957 | ||
958 | kset = top_kobj->kset; | |
959 | if (!kset->uevent_ops || !kset->uevent_ops->uevent) | |
960 | goto out; | |
961 | ||
962 | /* respect filter */ | |
963 | if (kset->uevent_ops && kset->uevent_ops->filter) | |
964 | if (!kset->uevent_ops->filter(kset, &dev->kobj)) | |
965 | goto out; | |
966 | ||
967 | env = kzalloc(sizeof(struct kobj_uevent_env), GFP_KERNEL); | |
968 | if (!env) | |
969 | return -ENOMEM; | |
970 | ||
971 | /* let the kset specific function add its keys */ | |
972 | retval = kset->uevent_ops->uevent(kset, &dev->kobj, env); | |
973 | if (retval) | |
974 | goto out; | |
975 | ||
976 | /* copy keys to file */ | |
977 | for (i = 0; i < env->envp_idx; i++) | |
978 | count += sprintf(&buf[count], "%s\n", env->envp[i]); | |
979 | out: | |
980 | kfree(env); | |
981 | return count; | |
982 | } | |
983 | ||
984 | static ssize_t uevent_store(struct device *dev, struct device_attribute *attr, | |
985 | const char *buf, size_t count) | |
986 | { | |
987 | if (kobject_synth_uevent(&dev->kobj, buf, count)) | |
988 | dev_err(dev, "uevent: failed to send synthetic uevent\n"); | |
989 | ||
990 | return count; | |
991 | } | |
992 | static DEVICE_ATTR_RW(uevent); | |
993 | ||
994 | static ssize_t online_show(struct device *dev, struct device_attribute *attr, | |
995 | char *buf) | |
996 | { | |
997 | bool val; | |
998 | ||
999 | device_lock(dev); | |
1000 | val = !dev->offline; | |
1001 | device_unlock(dev); | |
1002 | return sprintf(buf, "%u\n", val); | |
1003 | } | |
1004 | ||
1005 | static ssize_t online_store(struct device *dev, struct device_attribute *attr, | |
1006 | const char *buf, size_t count) | |
1007 | { | |
1008 | bool val; | |
1009 | int ret; | |
1010 | ||
1011 | ret = strtobool(buf, &val); | |
1012 | if (ret < 0) | |
1013 | return ret; | |
1014 | ||
1015 | ret = lock_device_hotplug_sysfs(); | |
1016 | if (ret) | |
1017 | return ret; | |
1018 | ||
1019 | ret = val ? device_online(dev) : device_offline(dev); | |
1020 | unlock_device_hotplug(); | |
1021 | return ret < 0 ? ret : count; | |
1022 | } | |
1023 | static DEVICE_ATTR_RW(online); | |
1024 | ||
1025 | int device_add_groups(struct device *dev, const struct attribute_group **groups) | |
1026 | { | |
1027 | return sysfs_create_groups(&dev->kobj, groups); | |
1028 | } | |
1029 | EXPORT_SYMBOL_GPL(device_add_groups); | |
1030 | ||
1031 | void device_remove_groups(struct device *dev, | |
1032 | const struct attribute_group **groups) | |
1033 | { | |
1034 | sysfs_remove_groups(&dev->kobj, groups); | |
1035 | } | |
1036 | EXPORT_SYMBOL_GPL(device_remove_groups); | |
1037 | ||
1038 | union device_attr_group_devres { | |
1039 | const struct attribute_group *group; | |
1040 | const struct attribute_group **groups; | |
1041 | }; | |
1042 | ||
1043 | static int devm_attr_group_match(struct device *dev, void *res, void *data) | |
1044 | { | |
1045 | return ((union device_attr_group_devres *)res)->group == data; | |
1046 | } | |
1047 | ||
1048 | static void devm_attr_group_remove(struct device *dev, void *res) | |
1049 | { | |
1050 | union device_attr_group_devres *devres = res; | |
1051 | const struct attribute_group *group = devres->group; | |
1052 | ||
1053 | dev_dbg(dev, "%s: removing group %p\n", __func__, group); | |
1054 | sysfs_remove_group(&dev->kobj, group); | |
1055 | } | |
1056 | ||
1057 | static void devm_attr_groups_remove(struct device *dev, void *res) | |
1058 | { | |
1059 | union device_attr_group_devres *devres = res; | |
1060 | const struct attribute_group **groups = devres->groups; | |
1061 | ||
1062 | dev_dbg(dev, "%s: removing groups %p\n", __func__, groups); | |
1063 | sysfs_remove_groups(&dev->kobj, groups); | |
1064 | } | |
1065 | ||
1066 | /** | |
1067 | * devm_device_add_group - given a device, create a managed attribute group | |
1068 | * @dev: The device to create the group for | |
1069 | * @grp: The attribute group to create | |
1070 | * | |
1071 | * This function creates a group for the first time. It will explicitly | |
1072 | * warn and error if any of the attribute files being created already exist. | |
1073 | * | |
1074 | * Returns 0 on success or error code on failure. | |
1075 | */ | |
1076 | int devm_device_add_group(struct device *dev, const struct attribute_group *grp) | |
1077 | { | |
1078 | union device_attr_group_devres *devres; | |
1079 | int error; | |
1080 | ||
1081 | devres = devres_alloc(devm_attr_group_remove, | |
1082 | sizeof(*devres), GFP_KERNEL); | |
1083 | if (!devres) | |
1084 | return -ENOMEM; | |
1085 | ||
1086 | error = sysfs_create_group(&dev->kobj, grp); | |
1087 | if (error) { | |
1088 | devres_free(devres); | |
1089 | return error; | |
1090 | } | |
1091 | ||
1092 | devres->group = grp; | |
1093 | devres_add(dev, devres); | |
1094 | return 0; | |
1095 | } | |
1096 | EXPORT_SYMBOL_GPL(devm_device_add_group); | |
1097 | ||
1098 | /** | |
1099 | * devm_device_remove_group: remove a managed group from a device | |
1100 | * @dev: device to remove the group from | |
1101 | * @grp: group to remove | |
1102 | * | |
1103 | * This function removes a group of attributes from a device. The attributes | |
1104 | * previously have to have been created for this group, otherwise it will fail. | |
1105 | */ | |
1106 | void devm_device_remove_group(struct device *dev, | |
1107 | const struct attribute_group *grp) | |
1108 | { | |
1109 | WARN_ON(devres_release(dev, devm_attr_group_remove, | |
1110 | devm_attr_group_match, | |
1111 | /* cast away const */ (void *)grp)); | |
1112 | } | |
1113 | EXPORT_SYMBOL_GPL(devm_device_remove_group); | |
1114 | ||
1115 | /** | |
1116 | * devm_device_add_groups - create a bunch of managed attribute groups | |
1117 | * @dev: The device to create the group for | |
1118 | * @groups: The attribute groups to create, NULL terminated | |
1119 | * | |
1120 | * This function creates a bunch of managed attribute groups. If an error | |
1121 | * occurs when creating a group, all previously created groups will be | |
1122 | * removed, unwinding everything back to the original state when this | |
1123 | * function was called. It will explicitly warn and error if any of the | |
1124 | * attribute files being created already exist. | |
1125 | * | |
1126 | * Returns 0 on success or error code from sysfs_create_group on failure. | |
1127 | */ | |
1128 | int devm_device_add_groups(struct device *dev, | |
1129 | const struct attribute_group **groups) | |
1130 | { | |
1131 | union device_attr_group_devres *devres; | |
1132 | int error; | |
1133 | ||
1134 | devres = devres_alloc(devm_attr_groups_remove, | |
1135 | sizeof(*devres), GFP_KERNEL); | |
1136 | if (!devres) | |
1137 | return -ENOMEM; | |
1138 | ||
1139 | error = sysfs_create_groups(&dev->kobj, groups); | |
1140 | if (error) { | |
1141 | devres_free(devres); | |
1142 | return error; | |
1143 | } | |
1144 | ||
1145 | devres->groups = groups; | |
1146 | devres_add(dev, devres); | |
1147 | return 0; | |
1148 | } | |
1149 | EXPORT_SYMBOL_GPL(devm_device_add_groups); | |
1150 | ||
1151 | /** | |
1152 | * devm_device_remove_groups - remove a list of managed groups | |
1153 | * | |
1154 | * @dev: The device for the groups to be removed from | |
1155 | * @groups: NULL terminated list of groups to be removed | |
1156 | * | |
1157 | * If groups is not NULL, remove the specified groups from the device. | |
1158 | */ | |
1159 | void devm_device_remove_groups(struct device *dev, | |
1160 | const struct attribute_group **groups) | |
1161 | { | |
1162 | WARN_ON(devres_release(dev, devm_attr_groups_remove, | |
1163 | devm_attr_group_match, | |
1164 | /* cast away const */ (void *)groups)); | |
1165 | } | |
1166 | EXPORT_SYMBOL_GPL(devm_device_remove_groups); | |
1167 | ||
1168 | static int device_add_attrs(struct device *dev) | |
1169 | { | |
1170 | struct class *class = dev->class; | |
1171 | const struct device_type *type = dev->type; | |
1172 | int error; | |
1173 | ||
1174 | if (class) { | |
1175 | error = device_add_groups(dev, class->dev_groups); | |
1176 | if (error) | |
1177 | return error; | |
1178 | } | |
1179 | ||
1180 | if (type) { | |
1181 | error = device_add_groups(dev, type->groups); | |
1182 | if (error) | |
1183 | goto err_remove_class_groups; | |
1184 | } | |
1185 | ||
1186 | error = device_add_groups(dev, dev->groups); | |
1187 | if (error) | |
1188 | goto err_remove_type_groups; | |
1189 | ||
1190 | if (device_supports_offline(dev) && !dev->offline_disabled) { | |
1191 | error = device_create_file(dev, &dev_attr_online); | |
1192 | if (error) | |
1193 | goto err_remove_dev_groups; | |
1194 | } | |
1195 | ||
1196 | return 0; | |
1197 | ||
1198 | err_remove_dev_groups: | |
1199 | device_remove_groups(dev, dev->groups); | |
1200 | err_remove_type_groups: | |
1201 | if (type) | |
1202 | device_remove_groups(dev, type->groups); | |
1203 | err_remove_class_groups: | |
1204 | if (class) | |
1205 | device_remove_groups(dev, class->dev_groups); | |
1206 | ||
1207 | return error; | |
1208 | } | |
1209 | ||
1210 | static void device_remove_attrs(struct device *dev) | |
1211 | { | |
1212 | struct class *class = dev->class; | |
1213 | const struct device_type *type = dev->type; | |
1214 | ||
1215 | device_remove_file(dev, &dev_attr_online); | |
1216 | device_remove_groups(dev, dev->groups); | |
1217 | ||
1218 | if (type) | |
1219 | device_remove_groups(dev, type->groups); | |
1220 | ||
1221 | if (class) | |
1222 | device_remove_groups(dev, class->dev_groups); | |
1223 | } | |
1224 | ||
1225 | static ssize_t dev_show(struct device *dev, struct device_attribute *attr, | |
1226 | char *buf) | |
1227 | { | |
1228 | return print_dev_t(buf, dev->devt); | |
1229 | } | |
1230 | static DEVICE_ATTR_RO(dev); | |
1231 | ||
1232 | /* /sys/devices/ */ | |
1233 | struct kset *devices_kset; | |
1234 | ||
1235 | /** | |
1236 | * devices_kset_move_before - Move device in the devices_kset's list. | |
1237 | * @deva: Device to move. | |
1238 | * @devb: Device @deva should come before. | |
1239 | */ | |
1240 | static void devices_kset_move_before(struct device *deva, struct device *devb) | |
1241 | { | |
1242 | if (!devices_kset) | |
1243 | return; | |
1244 | pr_debug("devices_kset: Moving %s before %s\n", | |
1245 | dev_name(deva), dev_name(devb)); | |
1246 | spin_lock(&devices_kset->list_lock); | |
1247 | list_move_tail(&deva->kobj.entry, &devb->kobj.entry); | |
1248 | spin_unlock(&devices_kset->list_lock); | |
1249 | } | |
1250 | ||
1251 | /** | |
1252 | * devices_kset_move_after - Move device in the devices_kset's list. | |
1253 | * @deva: Device to move | |
1254 | * @devb: Device @deva should come after. | |
1255 | */ | |
1256 | static void devices_kset_move_after(struct device *deva, struct device *devb) | |
1257 | { | |
1258 | if (!devices_kset) | |
1259 | return; | |
1260 | pr_debug("devices_kset: Moving %s after %s\n", | |
1261 | dev_name(deva), dev_name(devb)); | |
1262 | spin_lock(&devices_kset->list_lock); | |
1263 | list_move(&deva->kobj.entry, &devb->kobj.entry); | |
1264 | spin_unlock(&devices_kset->list_lock); | |
1265 | } | |
1266 | ||
1267 | /** | |
1268 | * devices_kset_move_last - move the device to the end of devices_kset's list. | |
1269 | * @dev: device to move | |
1270 | */ | |
1271 | void devices_kset_move_last(struct device *dev) | |
1272 | { | |
1273 | if (!devices_kset) | |
1274 | return; | |
1275 | pr_debug("devices_kset: Moving %s to end of list\n", dev_name(dev)); | |
1276 | spin_lock(&devices_kset->list_lock); | |
1277 | list_move_tail(&dev->kobj.entry, &devices_kset->list); | |
1278 | spin_unlock(&devices_kset->list_lock); | |
1279 | } | |
1280 | ||
1281 | /** | |
1282 | * device_create_file - create sysfs attribute file for device. | |
1283 | * @dev: device. | |
1284 | * @attr: device attribute descriptor. | |
1285 | */ | |
1286 | int device_create_file(struct device *dev, | |
1287 | const struct device_attribute *attr) | |
1288 | { | |
1289 | int error = 0; | |
1290 | ||
1291 | if (dev) { | |
1292 | WARN(((attr->attr.mode & S_IWUGO) && !attr->store), | |
1293 | "Attribute %s: write permission without 'store'\n", | |
1294 | attr->attr.name); | |
1295 | WARN(((attr->attr.mode & S_IRUGO) && !attr->show), | |
1296 | "Attribute %s: read permission without 'show'\n", | |
1297 | attr->attr.name); | |
1298 | error = sysfs_create_file(&dev->kobj, &attr->attr); | |
1299 | } | |
1300 | ||
1301 | return error; | |
1302 | } | |
1303 | EXPORT_SYMBOL_GPL(device_create_file); | |
1304 | ||
1305 | /** | |
1306 | * device_remove_file - remove sysfs attribute file. | |
1307 | * @dev: device. | |
1308 | * @attr: device attribute descriptor. | |
1309 | */ | |
1310 | void device_remove_file(struct device *dev, | |
1311 | const struct device_attribute *attr) | |
1312 | { | |
1313 | if (dev) | |
1314 | sysfs_remove_file(&dev->kobj, &attr->attr); | |
1315 | } | |
1316 | EXPORT_SYMBOL_GPL(device_remove_file); | |
1317 | ||
1318 | /** | |
1319 | * device_remove_file_self - remove sysfs attribute file from its own method. | |
1320 | * @dev: device. | |
1321 | * @attr: device attribute descriptor. | |
1322 | * | |
1323 | * See kernfs_remove_self() for details. | |
1324 | */ | |
1325 | bool device_remove_file_self(struct device *dev, | |
1326 | const struct device_attribute *attr) | |
1327 | { | |
1328 | if (dev) | |
1329 | return sysfs_remove_file_self(&dev->kobj, &attr->attr); | |
1330 | else | |
1331 | return false; | |
1332 | } | |
1333 | EXPORT_SYMBOL_GPL(device_remove_file_self); | |
1334 | ||
1335 | /** | |
1336 | * device_create_bin_file - create sysfs binary attribute file for device. | |
1337 | * @dev: device. | |
1338 | * @attr: device binary attribute descriptor. | |
1339 | */ | |
1340 | int device_create_bin_file(struct device *dev, | |
1341 | const struct bin_attribute *attr) | |
1342 | { | |
1343 | int error = -EINVAL; | |
1344 | if (dev) | |
1345 | error = sysfs_create_bin_file(&dev->kobj, attr); | |
1346 | return error; | |
1347 | } | |
1348 | EXPORT_SYMBOL_GPL(device_create_bin_file); | |
1349 | ||
1350 | /** | |
1351 | * device_remove_bin_file - remove sysfs binary attribute file | |
1352 | * @dev: device. | |
1353 | * @attr: device binary attribute descriptor. | |
1354 | */ | |
1355 | void device_remove_bin_file(struct device *dev, | |
1356 | const struct bin_attribute *attr) | |
1357 | { | |
1358 | if (dev) | |
1359 | sysfs_remove_bin_file(&dev->kobj, attr); | |
1360 | } | |
1361 | EXPORT_SYMBOL_GPL(device_remove_bin_file); | |
1362 | ||
1363 | static void klist_children_get(struct klist_node *n) | |
1364 | { | |
1365 | struct device_private *p = to_device_private_parent(n); | |
1366 | struct device *dev = p->device; | |
1367 | ||
1368 | get_device(dev); | |
1369 | } | |
1370 | ||
1371 | static void klist_children_put(struct klist_node *n) | |
1372 | { | |
1373 | struct device_private *p = to_device_private_parent(n); | |
1374 | struct device *dev = p->device; | |
1375 | ||
1376 | put_device(dev); | |
1377 | } | |
1378 | ||
1379 | /** | |
1380 | * device_initialize - init device structure. | |
1381 | * @dev: device. | |
1382 | * | |
1383 | * This prepares the device for use by other layers by initializing | |
1384 | * its fields. | |
1385 | * It is the first half of device_register(), if called by | |
1386 | * that function, though it can also be called separately, so one | |
1387 | * may use @dev's fields. In particular, get_device()/put_device() | |
1388 | * may be used for reference counting of @dev after calling this | |
1389 | * function. | |
1390 | * | |
1391 | * All fields in @dev must be initialized by the caller to 0, except | |
1392 | * for those explicitly set to some other value. The simplest | |
1393 | * approach is to use kzalloc() to allocate the structure containing | |
1394 | * @dev. | |
1395 | * | |
1396 | * NOTE: Use put_device() to give up your reference instead of freeing | |
1397 | * @dev directly once you have called this function. | |
1398 | */ | |
1399 | void device_initialize(struct device *dev) | |
1400 | { | |
1401 | dev->kobj.kset = devices_kset; | |
1402 | kobject_init(&dev->kobj, &device_ktype); | |
1403 | INIT_LIST_HEAD(&dev->dma_pools); | |
1404 | mutex_init(&dev->mutex); | |
1405 | lockdep_set_novalidate_class(&dev->mutex); | |
1406 | spin_lock_init(&dev->devres_lock); | |
1407 | INIT_LIST_HEAD(&dev->devres_head); | |
1408 | device_pm_init(dev); | |
1409 | set_dev_node(dev, -1); | |
1410 | #ifdef CONFIG_GENERIC_MSI_IRQ | |
1411 | INIT_LIST_HEAD(&dev->msi_list); | |
1412 | #endif | |
1413 | INIT_LIST_HEAD(&dev->links.consumers); | |
1414 | INIT_LIST_HEAD(&dev->links.suppliers); | |
1415 | dev->links.status = DL_DEV_NO_DRIVER; | |
1416 | } | |
1417 | EXPORT_SYMBOL_GPL(device_initialize); | |
1418 | ||
1419 | struct kobject *virtual_device_parent(struct device *dev) | |
1420 | { | |
1421 | static struct kobject *virtual_dir = NULL; | |
1422 | ||
1423 | if (!virtual_dir) | |
1424 | virtual_dir = kobject_create_and_add("virtual", | |
1425 | &devices_kset->kobj); | |
1426 | ||
1427 | return virtual_dir; | |
1428 | } | |
1429 | ||
1430 | struct class_dir { | |
1431 | struct kobject kobj; | |
1432 | struct class *class; | |
1433 | }; | |
1434 | ||
1435 | #define to_class_dir(obj) container_of(obj, struct class_dir, kobj) | |
1436 | ||
1437 | static void class_dir_release(struct kobject *kobj) | |
1438 | { | |
1439 | struct class_dir *dir = to_class_dir(kobj); | |
1440 | kfree(dir); | |
1441 | } | |
1442 | ||
1443 | static const | |
1444 | struct kobj_ns_type_operations *class_dir_child_ns_type(struct kobject *kobj) | |
1445 | { | |
1446 | struct class_dir *dir = to_class_dir(kobj); | |
1447 | return dir->class->ns_type; | |
1448 | } | |
1449 | ||
1450 | static struct kobj_type class_dir_ktype = { | |
1451 | .release = class_dir_release, | |
1452 | .sysfs_ops = &kobj_sysfs_ops, | |
1453 | .child_ns_type = class_dir_child_ns_type | |
1454 | }; | |
1455 | ||
1456 | static struct kobject * | |
1457 | class_dir_create_and_add(struct class *class, struct kobject *parent_kobj) | |
1458 | { | |
1459 | struct class_dir *dir; | |
1460 | int retval; | |
1461 | ||
1462 | dir = kzalloc(sizeof(*dir), GFP_KERNEL); | |
1463 | if (!dir) | |
1464 | return NULL; | |
1465 | ||
1466 | dir->class = class; | |
1467 | kobject_init(&dir->kobj, &class_dir_ktype); | |
1468 | ||
1469 | dir->kobj.kset = &class->p->glue_dirs; | |
1470 | ||
1471 | retval = kobject_add(&dir->kobj, parent_kobj, "%s", class->name); | |
1472 | if (retval < 0) { | |
1473 | kobject_put(&dir->kobj); | |
1474 | return NULL; | |
1475 | } | |
1476 | return &dir->kobj; | |
1477 | } | |
1478 | ||
1479 | static DEFINE_MUTEX(gdp_mutex); | |
1480 | ||
1481 | static struct kobject *get_device_parent(struct device *dev, | |
1482 | struct device *parent) | |
1483 | { | |
1484 | if (dev->class) { | |
1485 | struct kobject *kobj = NULL; | |
1486 | struct kobject *parent_kobj; | |
1487 | struct kobject *k; | |
1488 | ||
1489 | #ifdef CONFIG_BLOCK | |
1490 | /* block disks show up in /sys/block */ | |
1491 | if (sysfs_deprecated && dev->class == &block_class) { | |
1492 | if (parent && parent->class == &block_class) | |
1493 | return &parent->kobj; | |
1494 | return &block_class.p->subsys.kobj; | |
1495 | } | |
1496 | #endif | |
1497 | ||
1498 | /* | |
1499 | * If we have no parent, we live in "virtual". | |
1500 | * Class-devices with a non class-device as parent, live | |
1501 | * in a "glue" directory to prevent namespace collisions. | |
1502 | */ | |
1503 | if (parent == NULL) | |
1504 | parent_kobj = virtual_device_parent(dev); | |
1505 | else if (parent->class && !dev->class->ns_type) | |
1506 | return &parent->kobj; | |
1507 | else | |
1508 | parent_kobj = &parent->kobj; | |
1509 | ||
1510 | mutex_lock(&gdp_mutex); | |
1511 | ||
1512 | /* find our class-directory at the parent and reference it */ | |
1513 | spin_lock(&dev->class->p->glue_dirs.list_lock); | |
1514 | list_for_each_entry(k, &dev->class->p->glue_dirs.list, entry) | |
1515 | if (k->parent == parent_kobj) { | |
1516 | kobj = kobject_get(k); | |
1517 | break; | |
1518 | } | |
1519 | spin_unlock(&dev->class->p->glue_dirs.list_lock); | |
1520 | if (kobj) { | |
1521 | mutex_unlock(&gdp_mutex); | |
1522 | return kobj; | |
1523 | } | |
1524 | ||
1525 | /* or create a new class-directory at the parent device */ | |
1526 | k = class_dir_create_and_add(dev->class, parent_kobj); | |
1527 | /* do not emit an uevent for this simple "glue" directory */ | |
1528 | mutex_unlock(&gdp_mutex); | |
1529 | return k; | |
1530 | } | |
1531 | ||
1532 | /* subsystems can specify a default root directory for their devices */ | |
1533 | if (!parent && dev->bus && dev->bus->dev_root) | |
1534 | return &dev->bus->dev_root->kobj; | |
1535 | ||
1536 | if (parent) | |
1537 | return &parent->kobj; | |
1538 | return NULL; | |
1539 | } | |
1540 | ||
1541 | static inline bool live_in_glue_dir(struct kobject *kobj, | |
1542 | struct device *dev) | |
1543 | { | |
1544 | if (!kobj || !dev->class || | |
1545 | kobj->kset != &dev->class->p->glue_dirs) | |
1546 | return false; | |
1547 | return true; | |
1548 | } | |
1549 | ||
1550 | static inline struct kobject *get_glue_dir(struct device *dev) | |
1551 | { | |
1552 | return dev->kobj.parent; | |
1553 | } | |
1554 | ||
1555 | /* | |
1556 | * make sure cleaning up dir as the last step, we need to make | |
1557 | * sure .release handler of kobject is run with holding the | |
1558 | * global lock | |
1559 | */ | |
1560 | static void cleanup_glue_dir(struct device *dev, struct kobject *glue_dir) | |
1561 | { | |
1562 | /* see if we live in a "glue" directory */ | |
1563 | if (!live_in_glue_dir(glue_dir, dev)) | |
1564 | return; | |
1565 | ||
1566 | mutex_lock(&gdp_mutex); | |
1567 | kobject_put(glue_dir); | |
1568 | mutex_unlock(&gdp_mutex); | |
1569 | } | |
1570 | ||
1571 | static int device_add_class_symlinks(struct device *dev) | |
1572 | { | |
1573 | struct device_node *of_node = dev_of_node(dev); | |
1574 | int error; | |
1575 | ||
1576 | if (of_node) { | |
1577 | error = sysfs_create_link(&dev->kobj, of_node_kobj(of_node), "of_node"); | |
1578 | if (error) | |
1579 | dev_warn(dev, "Error %d creating of_node link\n",error); | |
1580 | /* An error here doesn't warrant bringing down the device */ | |
1581 | } | |
1582 | ||
1583 | if (!dev->class) | |
1584 | return 0; | |
1585 | ||
1586 | error = sysfs_create_link(&dev->kobj, | |
1587 | &dev->class->p->subsys.kobj, | |
1588 | "subsystem"); | |
1589 | if (error) | |
1590 | goto out_devnode; | |
1591 | ||
1592 | if (dev->parent && device_is_not_partition(dev)) { | |
1593 | error = sysfs_create_link(&dev->kobj, &dev->parent->kobj, | |
1594 | "device"); | |
1595 | if (error) | |
1596 | goto out_subsys; | |
1597 | } | |
1598 | ||
1599 | #ifdef CONFIG_BLOCK | |
1600 | /* /sys/block has directories and does not need symlinks */ | |
1601 | if (sysfs_deprecated && dev->class == &block_class) | |
1602 | return 0; | |
1603 | #endif | |
1604 | ||
1605 | /* link in the class directory pointing to the device */ | |
1606 | error = sysfs_create_link(&dev->class->p->subsys.kobj, | |
1607 | &dev->kobj, dev_name(dev)); | |
1608 | if (error) | |
1609 | goto out_device; | |
1610 | ||
1611 | return 0; | |
1612 | ||
1613 | out_device: | |
1614 | sysfs_remove_link(&dev->kobj, "device"); | |
1615 | ||
1616 | out_subsys: | |
1617 | sysfs_remove_link(&dev->kobj, "subsystem"); | |
1618 | out_devnode: | |
1619 | sysfs_remove_link(&dev->kobj, "of_node"); | |
1620 | return error; | |
1621 | } | |
1622 | ||
1623 | static void device_remove_class_symlinks(struct device *dev) | |
1624 | { | |
1625 | if (dev_of_node(dev)) | |
1626 | sysfs_remove_link(&dev->kobj, "of_node"); | |
1627 | ||
1628 | if (!dev->class) | |
1629 | return; | |
1630 | ||
1631 | if (dev->parent && device_is_not_partition(dev)) | |
1632 | sysfs_remove_link(&dev->kobj, "device"); | |
1633 | sysfs_remove_link(&dev->kobj, "subsystem"); | |
1634 | #ifdef CONFIG_BLOCK | |
1635 | if (sysfs_deprecated && dev->class == &block_class) | |
1636 | return; | |
1637 | #endif | |
1638 | sysfs_delete_link(&dev->class->p->subsys.kobj, &dev->kobj, dev_name(dev)); | |
1639 | } | |
1640 | ||
1641 | /** | |
1642 | * dev_set_name - set a device name | |
1643 | * @dev: device | |
1644 | * @fmt: format string for the device's name | |
1645 | */ | |
1646 | int dev_set_name(struct device *dev, const char *fmt, ...) | |
1647 | { | |
1648 | va_list vargs; | |
1649 | int err; | |
1650 | ||
1651 | va_start(vargs, fmt); | |
1652 | err = kobject_set_name_vargs(&dev->kobj, fmt, vargs); | |
1653 | va_end(vargs); | |
1654 | return err; | |
1655 | } | |
1656 | EXPORT_SYMBOL_GPL(dev_set_name); | |
1657 | ||
1658 | /** | |
1659 | * device_to_dev_kobj - select a /sys/dev/ directory for the device | |
1660 | * @dev: device | |
1661 | * | |
1662 | * By default we select char/ for new entries. Setting class->dev_obj | |
1663 | * to NULL prevents an entry from being created. class->dev_kobj must | |
1664 | * be set (or cleared) before any devices are registered to the class | |
1665 | * otherwise device_create_sys_dev_entry() and | |
1666 | * device_remove_sys_dev_entry() will disagree about the presence of | |
1667 | * the link. | |
1668 | */ | |
1669 | static struct kobject *device_to_dev_kobj(struct device *dev) | |
1670 | { | |
1671 | struct kobject *kobj; | |
1672 | ||
1673 | if (dev->class) | |
1674 | kobj = dev->class->dev_kobj; | |
1675 | else | |
1676 | kobj = sysfs_dev_char_kobj; | |
1677 | ||
1678 | return kobj; | |
1679 | } | |
1680 | ||
1681 | static int device_create_sys_dev_entry(struct device *dev) | |
1682 | { | |
1683 | struct kobject *kobj = device_to_dev_kobj(dev); | |
1684 | int error = 0; | |
1685 | char devt_str[15]; | |
1686 | ||
1687 | if (kobj) { | |
1688 | format_dev_t(devt_str, dev->devt); | |
1689 | error = sysfs_create_link(kobj, &dev->kobj, devt_str); | |
1690 | } | |
1691 | ||
1692 | return error; | |
1693 | } | |
1694 | ||
1695 | static void device_remove_sys_dev_entry(struct device *dev) | |
1696 | { | |
1697 | struct kobject *kobj = device_to_dev_kobj(dev); | |
1698 | char devt_str[15]; | |
1699 | ||
1700 | if (kobj) { | |
1701 | format_dev_t(devt_str, dev->devt); | |
1702 | sysfs_remove_link(kobj, devt_str); | |
1703 | } | |
1704 | } | |
1705 | ||
1706 | int device_private_init(struct device *dev) | |
1707 | { | |
1708 | dev->p = kzalloc(sizeof(*dev->p), GFP_KERNEL); | |
1709 | if (!dev->p) | |
1710 | return -ENOMEM; | |
1711 | dev->p->device = dev; | |
1712 | klist_init(&dev->p->klist_children, klist_children_get, | |
1713 | klist_children_put); | |
1714 | INIT_LIST_HEAD(&dev->p->deferred_probe); | |
1715 | return 0; | |
1716 | } | |
1717 | ||
1718 | /** | |
1719 | * device_add - add device to device hierarchy. | |
1720 | * @dev: device. | |
1721 | * | |
1722 | * This is part 2 of device_register(), though may be called | |
1723 | * separately _iff_ device_initialize() has been called separately. | |
1724 | * | |
1725 | * This adds @dev to the kobject hierarchy via kobject_add(), adds it | |
1726 | * to the global and sibling lists for the device, then | |
1727 | * adds it to the other relevant subsystems of the driver model. | |
1728 | * | |
1729 | * Do not call this routine or device_register() more than once for | |
1730 | * any device structure. The driver model core is not designed to work | |
1731 | * with devices that get unregistered and then spring back to life. | |
1732 | * (Among other things, it's very hard to guarantee that all references | |
1733 | * to the previous incarnation of @dev have been dropped.) Allocate | |
1734 | * and register a fresh new struct device instead. | |
1735 | * | |
1736 | * NOTE: _Never_ directly free @dev after calling this function, even | |
1737 | * if it returned an error! Always use put_device() to give up your | |
1738 | * reference instead. | |
1739 | */ | |
1740 | int device_add(struct device *dev) | |
1741 | { | |
1742 | struct device *parent; | |
1743 | struct kobject *kobj; | |
1744 | struct class_interface *class_intf; | |
1745 | int error = -EINVAL; | |
1746 | struct kobject *glue_dir = NULL; | |
1747 | ||
1748 | dev = get_device(dev); | |
1749 | if (!dev) | |
1750 | goto done; | |
1751 | ||
1752 | if (!dev->p) { | |
1753 | error = device_private_init(dev); | |
1754 | if (error) | |
1755 | goto done; | |
1756 | } | |
1757 | ||
1758 | /* | |
1759 | * for statically allocated devices, which should all be converted | |
1760 | * some day, we need to initialize the name. We prevent reading back | |
1761 | * the name, and force the use of dev_name() | |
1762 | */ | |
1763 | if (dev->init_name) { | |
1764 | dev_set_name(dev, "%s", dev->init_name); | |
1765 | dev->init_name = NULL; | |
1766 | } | |
1767 | ||
1768 | /* subsystems can specify simple device enumeration */ | |
1769 | if (!dev_name(dev) && dev->bus && dev->bus->dev_name) | |
1770 | dev_set_name(dev, "%s%u", dev->bus->dev_name, dev->id); | |
1771 | ||
1772 | if (!dev_name(dev)) { | |
1773 | error = -EINVAL; | |
1774 | goto name_error; | |
1775 | } | |
1776 | ||
1777 | pr_debug("device: '%s': %s\n", dev_name(dev), __func__); | |
1778 | ||
1779 | parent = get_device(dev->parent); | |
1780 | kobj = get_device_parent(dev, parent); | |
1781 | if (kobj) | |
1782 | dev->kobj.parent = kobj; | |
1783 | ||
1784 | /* use parent numa_node */ | |
1785 | if (parent && (dev_to_node(dev) == NUMA_NO_NODE)) | |
1786 | set_dev_node(dev, dev_to_node(parent)); | |
1787 | ||
1788 | /* first, register with generic layer. */ | |
1789 | /* we require the name to be set before, and pass NULL */ | |
1790 | error = kobject_add(&dev->kobj, dev->kobj.parent, NULL); | |
1791 | if (error) { | |
1792 | glue_dir = get_glue_dir(dev); | |
1793 | goto Error; | |
1794 | } | |
1795 | ||
1796 | /* notify platform of device entry */ | |
1797 | if (platform_notify) | |
1798 | platform_notify(dev); | |
1799 | ||
1800 | error = device_create_file(dev, &dev_attr_uevent); | |
1801 | if (error) | |
1802 | goto attrError; | |
1803 | ||
1804 | error = device_add_class_symlinks(dev); | |
1805 | if (error) | |
1806 | goto SymlinkError; | |
1807 | error = device_add_attrs(dev); | |
1808 | if (error) | |
1809 | goto AttrsError; | |
1810 | error = bus_add_device(dev); | |
1811 | if (error) | |
1812 | goto BusError; | |
1813 | error = dpm_sysfs_add(dev); | |
1814 | if (error) | |
1815 | goto DPMError; | |
1816 | device_pm_add(dev); | |
1817 | ||
1818 | if (MAJOR(dev->devt)) { | |
1819 | error = device_create_file(dev, &dev_attr_dev); | |
1820 | if (error) | |
1821 | goto DevAttrError; | |
1822 | ||
1823 | error = device_create_sys_dev_entry(dev); | |
1824 | if (error) | |
1825 | goto SysEntryError; | |
1826 | ||
1827 | devtmpfs_create_node(dev); | |
1828 | } | |
1829 | ||
1830 | /* Notify clients of device addition. This call must come | |
1831 | * after dpm_sysfs_add() and before kobject_uevent(). | |
1832 | */ | |
1833 | if (dev->bus) | |
1834 | blocking_notifier_call_chain(&dev->bus->p->bus_notifier, | |
1835 | BUS_NOTIFY_ADD_DEVICE, dev); | |
1836 | ||
1837 | kobject_uevent(&dev->kobj, KOBJ_ADD); | |
1838 | bus_probe_device(dev); | |
1839 | if (parent) | |
1840 | klist_add_tail(&dev->p->knode_parent, | |
1841 | &parent->p->klist_children); | |
1842 | ||
1843 | if (dev->class) { | |
1844 | mutex_lock(&dev->class->p->mutex); | |
1845 | /* tie the class to the device */ | |
1846 | klist_add_tail(&dev->knode_class, | |
1847 | &dev->class->p->klist_devices); | |
1848 | ||
1849 | /* notify any interfaces that the device is here */ | |
1850 | list_for_each_entry(class_intf, | |
1851 | &dev->class->p->interfaces, node) | |
1852 | if (class_intf->add_dev) | |
1853 | class_intf->add_dev(dev, class_intf); | |
1854 | mutex_unlock(&dev->class->p->mutex); | |
1855 | } | |
1856 | done: | |
1857 | put_device(dev); | |
1858 | return error; | |
1859 | SysEntryError: | |
1860 | if (MAJOR(dev->devt)) | |
1861 | device_remove_file(dev, &dev_attr_dev); | |
1862 | DevAttrError: | |
1863 | device_pm_remove(dev); | |
1864 | dpm_sysfs_remove(dev); | |
1865 | DPMError: | |
1866 | bus_remove_device(dev); | |
1867 | BusError: | |
1868 | device_remove_attrs(dev); | |
1869 | AttrsError: | |
1870 | device_remove_class_symlinks(dev); | |
1871 | SymlinkError: | |
1872 | device_remove_file(dev, &dev_attr_uevent); | |
1873 | attrError: | |
1874 | kobject_uevent(&dev->kobj, KOBJ_REMOVE); | |
1875 | glue_dir = get_glue_dir(dev); | |
1876 | kobject_del(&dev->kobj); | |
1877 | Error: | |
1878 | cleanup_glue_dir(dev, glue_dir); | |
1879 | put_device(parent); | |
1880 | name_error: | |
1881 | kfree(dev->p); | |
1882 | dev->p = NULL; | |
1883 | goto done; | |
1884 | } | |
1885 | EXPORT_SYMBOL_GPL(device_add); | |
1886 | ||
1887 | /** | |
1888 | * device_register - register a device with the system. | |
1889 | * @dev: pointer to the device structure | |
1890 | * | |
1891 | * This happens in two clean steps - initialize the device | |
1892 | * and add it to the system. The two steps can be called | |
1893 | * separately, but this is the easiest and most common. | |
1894 | * I.e. you should only call the two helpers separately if | |
1895 | * have a clearly defined need to use and refcount the device | |
1896 | * before it is added to the hierarchy. | |
1897 | * | |
1898 | * For more information, see the kerneldoc for device_initialize() | |
1899 | * and device_add(). | |
1900 | * | |
1901 | * NOTE: _Never_ directly free @dev after calling this function, even | |
1902 | * if it returned an error! Always use put_device() to give up the | |
1903 | * reference initialized in this function instead. | |
1904 | */ | |
1905 | int device_register(struct device *dev) | |
1906 | { | |
1907 | device_initialize(dev); | |
1908 | return device_add(dev); | |
1909 | } | |
1910 | EXPORT_SYMBOL_GPL(device_register); | |
1911 | ||
1912 | /** | |
1913 | * get_device - increment reference count for device. | |
1914 | * @dev: device. | |
1915 | * | |
1916 | * This simply forwards the call to kobject_get(), though | |
1917 | * we do take care to provide for the case that we get a NULL | |
1918 | * pointer passed in. | |
1919 | */ | |
1920 | struct device *get_device(struct device *dev) | |
1921 | { | |
1922 | return dev ? kobj_to_dev(kobject_get(&dev->kobj)) : NULL; | |
1923 | } | |
1924 | EXPORT_SYMBOL_GPL(get_device); | |
1925 | ||
1926 | /** | |
1927 | * put_device - decrement reference count. | |
1928 | * @dev: device in question. | |
1929 | */ | |
1930 | void put_device(struct device *dev) | |
1931 | { | |
1932 | /* might_sleep(); */ | |
1933 | if (dev) | |
1934 | kobject_put(&dev->kobj); | |
1935 | } | |
1936 | EXPORT_SYMBOL_GPL(put_device); | |
1937 | ||
1938 | /** | |
1939 | * device_del - delete device from system. | |
1940 | * @dev: device. | |
1941 | * | |
1942 | * This is the first part of the device unregistration | |
1943 | * sequence. This removes the device from the lists we control | |
1944 | * from here, has it removed from the other driver model | |
1945 | * subsystems it was added to in device_add(), and removes it | |
1946 | * from the kobject hierarchy. | |
1947 | * | |
1948 | * NOTE: this should be called manually _iff_ device_add() was | |
1949 | * also called manually. | |
1950 | */ | |
1951 | void device_del(struct device *dev) | |
1952 | { | |
1953 | struct device *parent = dev->parent; | |
1954 | struct kobject *glue_dir = NULL; | |
1955 | struct class_interface *class_intf; | |
1956 | ||
1957 | /* Notify clients of device removal. This call must come | |
1958 | * before dpm_sysfs_remove(). | |
1959 | */ | |
1960 | if (dev->bus) | |
1961 | blocking_notifier_call_chain(&dev->bus->p->bus_notifier, | |
1962 | BUS_NOTIFY_DEL_DEVICE, dev); | |
1963 | ||
1964 | dpm_sysfs_remove(dev); | |
1965 | if (parent) | |
1966 | klist_del(&dev->p->knode_parent); | |
1967 | if (MAJOR(dev->devt)) { | |
1968 | devtmpfs_delete_node(dev); | |
1969 | device_remove_sys_dev_entry(dev); | |
1970 | device_remove_file(dev, &dev_attr_dev); | |
1971 | } | |
1972 | if (dev->class) { | |
1973 | device_remove_class_symlinks(dev); | |
1974 | ||
1975 | mutex_lock(&dev->class->p->mutex); | |
1976 | /* notify any interfaces that the device is now gone */ | |
1977 | list_for_each_entry(class_intf, | |
1978 | &dev->class->p->interfaces, node) | |
1979 | if (class_intf->remove_dev) | |
1980 | class_intf->remove_dev(dev, class_intf); | |
1981 | /* remove the device from the class list */ | |
1982 | klist_del(&dev->knode_class); | |
1983 | mutex_unlock(&dev->class->p->mutex); | |
1984 | } | |
1985 | device_remove_file(dev, &dev_attr_uevent); | |
1986 | device_remove_attrs(dev); | |
1987 | bus_remove_device(dev); | |
1988 | device_pm_remove(dev); | |
1989 | driver_deferred_probe_del(dev); | |
1990 | device_remove_properties(dev); | |
1991 | device_links_purge(dev); | |
1992 | ||
1993 | /* Notify the platform of the removal, in case they | |
1994 | * need to do anything... | |
1995 | */ | |
1996 | if (platform_notify_remove) | |
1997 | platform_notify_remove(dev); | |
1998 | if (dev->bus) | |
1999 | blocking_notifier_call_chain(&dev->bus->p->bus_notifier, | |
2000 | BUS_NOTIFY_REMOVED_DEVICE, dev); | |
2001 | kobject_uevent(&dev->kobj, KOBJ_REMOVE); | |
2002 | glue_dir = get_glue_dir(dev); | |
2003 | kobject_del(&dev->kobj); | |
2004 | cleanup_glue_dir(dev, glue_dir); | |
2005 | put_device(parent); | |
2006 | } | |
2007 | EXPORT_SYMBOL_GPL(device_del); | |
2008 | ||
2009 | /** | |
2010 | * device_unregister - unregister device from system. | |
2011 | * @dev: device going away. | |
2012 | * | |
2013 | * We do this in two parts, like we do device_register(). First, | |
2014 | * we remove it from all the subsystems with device_del(), then | |
2015 | * we decrement the reference count via put_device(). If that | |
2016 | * is the final reference count, the device will be cleaned up | |
2017 | * via device_release() above. Otherwise, the structure will | |
2018 | * stick around until the final reference to the device is dropped. | |
2019 | */ | |
2020 | void device_unregister(struct device *dev) | |
2021 | { | |
2022 | pr_debug("device: '%s': %s\n", dev_name(dev), __func__); | |
2023 | device_del(dev); | |
2024 | put_device(dev); | |
2025 | } | |
2026 | EXPORT_SYMBOL_GPL(device_unregister); | |
2027 | ||
2028 | static struct device *prev_device(struct klist_iter *i) | |
2029 | { | |
2030 | struct klist_node *n = klist_prev(i); | |
2031 | struct device *dev = NULL; | |
2032 | struct device_private *p; | |
2033 | ||
2034 | if (n) { | |
2035 | p = to_device_private_parent(n); | |
2036 | dev = p->device; | |
2037 | } | |
2038 | return dev; | |
2039 | } | |
2040 | ||
2041 | static struct device *next_device(struct klist_iter *i) | |
2042 | { | |
2043 | struct klist_node *n = klist_next(i); | |
2044 | struct device *dev = NULL; | |
2045 | struct device_private *p; | |
2046 | ||
2047 | if (n) { | |
2048 | p = to_device_private_parent(n); | |
2049 | dev = p->device; | |
2050 | } | |
2051 | return dev; | |
2052 | } | |
2053 | ||
2054 | /** | |
2055 | * device_get_devnode - path of device node file | |
2056 | * @dev: device | |
2057 | * @mode: returned file access mode | |
2058 | * @uid: returned file owner | |
2059 | * @gid: returned file group | |
2060 | * @tmp: possibly allocated string | |
2061 | * | |
2062 | * Return the relative path of a possible device node. | |
2063 | * Non-default names may need to allocate a memory to compose | |
2064 | * a name. This memory is returned in tmp and needs to be | |
2065 | * freed by the caller. | |
2066 | */ | |
2067 | const char *device_get_devnode(struct device *dev, | |
2068 | umode_t *mode, kuid_t *uid, kgid_t *gid, | |
2069 | const char **tmp) | |
2070 | { | |
2071 | char *s; | |
2072 | ||
2073 | *tmp = NULL; | |
2074 | ||
2075 | /* the device type may provide a specific name */ | |
2076 | if (dev->type && dev->type->devnode) | |
2077 | *tmp = dev->type->devnode(dev, mode, uid, gid); | |
2078 | if (*tmp) | |
2079 | return *tmp; | |
2080 | ||
2081 | /* the class may provide a specific name */ | |
2082 | if (dev->class && dev->class->devnode) | |
2083 | *tmp = dev->class->devnode(dev, mode); | |
2084 | if (*tmp) | |
2085 | return *tmp; | |
2086 | ||
2087 | /* return name without allocation, tmp == NULL */ | |
2088 | if (strchr(dev_name(dev), '!') == NULL) | |
2089 | return dev_name(dev); | |
2090 | ||
2091 | /* replace '!' in the name with '/' */ | |
2092 | s = kstrdup(dev_name(dev), GFP_KERNEL); | |
2093 | if (!s) | |
2094 | return NULL; | |
2095 | strreplace(s, '!', '/'); | |
2096 | return *tmp = s; | |
2097 | } | |
2098 | ||
2099 | /** | |
2100 | * device_for_each_child - device child iterator. | |
2101 | * @parent: parent struct device. | |
2102 | * @fn: function to be called for each device. | |
2103 | * @data: data for the callback. | |
2104 | * | |
2105 | * Iterate over @parent's child devices, and call @fn for each, | |
2106 | * passing it @data. | |
2107 | * | |
2108 | * We check the return of @fn each time. If it returns anything | |
2109 | * other than 0, we break out and return that value. | |
2110 | */ | |
2111 | int device_for_each_child(struct device *parent, void *data, | |
2112 | int (*fn)(struct device *dev, void *data)) | |
2113 | { | |
2114 | struct klist_iter i; | |
2115 | struct device *child; | |
2116 | int error = 0; | |
2117 | ||
2118 | if (!parent->p) | |
2119 | return 0; | |
2120 | ||
2121 | klist_iter_init(&parent->p->klist_children, &i); | |
2122 | while ((child = next_device(&i)) && !error) | |
2123 | error = fn(child, data); | |
2124 | klist_iter_exit(&i); | |
2125 | return error; | |
2126 | } | |
2127 | EXPORT_SYMBOL_GPL(device_for_each_child); | |
2128 | ||
2129 | /** | |
2130 | * device_for_each_child_reverse - device child iterator in reversed order. | |
2131 | * @parent: parent struct device. | |
2132 | * @fn: function to be called for each device. | |
2133 | * @data: data for the callback. | |
2134 | * | |
2135 | * Iterate over @parent's child devices, and call @fn for each, | |
2136 | * passing it @data. | |
2137 | * | |
2138 | * We check the return of @fn each time. If it returns anything | |
2139 | * other than 0, we break out and return that value. | |
2140 | */ | |
2141 | int device_for_each_child_reverse(struct device *parent, void *data, | |
2142 | int (*fn)(struct device *dev, void *data)) | |
2143 | { | |
2144 | struct klist_iter i; | |
2145 | struct device *child; | |
2146 | int error = 0; | |
2147 | ||
2148 | if (!parent->p) | |
2149 | return 0; | |
2150 | ||
2151 | klist_iter_init(&parent->p->klist_children, &i); | |
2152 | while ((child = prev_device(&i)) && !error) | |
2153 | error = fn(child, data); | |
2154 | klist_iter_exit(&i); | |
2155 | return error; | |
2156 | } | |
2157 | EXPORT_SYMBOL_GPL(device_for_each_child_reverse); | |
2158 | ||
2159 | /** | |
2160 | * device_find_child - device iterator for locating a particular device. | |
2161 | * @parent: parent struct device | |
2162 | * @match: Callback function to check device | |
2163 | * @data: Data to pass to match function | |
2164 | * | |
2165 | * This is similar to the device_for_each_child() function above, but it | |
2166 | * returns a reference to a device that is 'found' for later use, as | |
2167 | * determined by the @match callback. | |
2168 | * | |
2169 | * The callback should return 0 if the device doesn't match and non-zero | |
2170 | * if it does. If the callback returns non-zero and a reference to the | |
2171 | * current device can be obtained, this function will return to the caller | |
2172 | * and not iterate over any more devices. | |
2173 | * | |
2174 | * NOTE: you will need to drop the reference with put_device() after use. | |
2175 | */ | |
2176 | struct device *device_find_child(struct device *parent, void *data, | |
2177 | int (*match)(struct device *dev, void *data)) | |
2178 | { | |
2179 | struct klist_iter i; | |
2180 | struct device *child; | |
2181 | ||
2182 | if (!parent) | |
2183 | return NULL; | |
2184 | ||
2185 | klist_iter_init(&parent->p->klist_children, &i); | |
2186 | while ((child = next_device(&i))) | |
2187 | if (match(child, data) && get_device(child)) | |
2188 | break; | |
2189 | klist_iter_exit(&i); | |
2190 | return child; | |
2191 | } | |
2192 | EXPORT_SYMBOL_GPL(device_find_child); | |
2193 | ||
2194 | int __init devices_init(void) | |
2195 | { | |
2196 | devices_kset = kset_create_and_add("devices", &device_uevent_ops, NULL); | |
2197 | if (!devices_kset) | |
2198 | return -ENOMEM; | |
2199 | dev_kobj = kobject_create_and_add("dev", NULL); | |
2200 | if (!dev_kobj) | |
2201 | goto dev_kobj_err; | |
2202 | sysfs_dev_block_kobj = kobject_create_and_add("block", dev_kobj); | |
2203 | if (!sysfs_dev_block_kobj) | |
2204 | goto block_kobj_err; | |
2205 | sysfs_dev_char_kobj = kobject_create_and_add("char", dev_kobj); | |
2206 | if (!sysfs_dev_char_kobj) | |
2207 | goto char_kobj_err; | |
2208 | ||
2209 | return 0; | |
2210 | ||
2211 | char_kobj_err: | |
2212 | kobject_put(sysfs_dev_block_kobj); | |
2213 | block_kobj_err: | |
2214 | kobject_put(dev_kobj); | |
2215 | dev_kobj_err: | |
2216 | kset_unregister(devices_kset); | |
2217 | return -ENOMEM; | |
2218 | } | |
2219 | ||
2220 | static int device_check_offline(struct device *dev, void *not_used) | |
2221 | { | |
2222 | int ret; | |
2223 | ||
2224 | ret = device_for_each_child(dev, NULL, device_check_offline); | |
2225 | if (ret) | |
2226 | return ret; | |
2227 | ||
2228 | return device_supports_offline(dev) && !dev->offline ? -EBUSY : 0; | |
2229 | } | |
2230 | ||
2231 | /** | |
2232 | * device_offline - Prepare the device for hot-removal. | |
2233 | * @dev: Device to be put offline. | |
2234 | * | |
2235 | * Execute the device bus type's .offline() callback, if present, to prepare | |
2236 | * the device for a subsequent hot-removal. If that succeeds, the device must | |
2237 | * not be used until either it is removed or its bus type's .online() callback | |
2238 | * is executed. | |
2239 | * | |
2240 | * Call under device_hotplug_lock. | |
2241 | */ | |
2242 | int device_offline(struct device *dev) | |
2243 | { | |
2244 | int ret; | |
2245 | ||
2246 | if (dev->offline_disabled) | |
2247 | return -EPERM; | |
2248 | ||
2249 | ret = device_for_each_child(dev, NULL, device_check_offline); | |
2250 | if (ret) | |
2251 | return ret; | |
2252 | ||
2253 | device_lock(dev); | |
2254 | if (device_supports_offline(dev)) { | |
2255 | if (dev->offline) { | |
2256 | ret = 1; | |
2257 | } else { | |
2258 | ret = dev->bus->offline(dev); | |
2259 | if (!ret) { | |
2260 | kobject_uevent(&dev->kobj, KOBJ_OFFLINE); | |
2261 | dev->offline = true; | |
2262 | } | |
2263 | } | |
2264 | } | |
2265 | device_unlock(dev); | |
2266 | ||
2267 | return ret; | |
2268 | } | |
2269 | ||
2270 | /** | |
2271 | * device_online - Put the device back online after successful device_offline(). | |
2272 | * @dev: Device to be put back online. | |
2273 | * | |
2274 | * If device_offline() has been successfully executed for @dev, but the device | |
2275 | * has not been removed subsequently, execute its bus type's .online() callback | |
2276 | * to indicate that the device can be used again. | |
2277 | * | |
2278 | * Call under device_hotplug_lock. | |
2279 | */ | |
2280 | int device_online(struct device *dev) | |
2281 | { | |
2282 | int ret = 0; | |
2283 | ||
2284 | device_lock(dev); | |
2285 | if (device_supports_offline(dev)) { | |
2286 | if (dev->offline) { | |
2287 | ret = dev->bus->online(dev); | |
2288 | if (!ret) { | |
2289 | kobject_uevent(&dev->kobj, KOBJ_ONLINE); | |
2290 | dev->offline = false; | |
2291 | } | |
2292 | } else { | |
2293 | ret = 1; | |
2294 | } | |
2295 | } | |
2296 | device_unlock(dev); | |
2297 | ||
2298 | return ret; | |
2299 | } | |
2300 | ||
2301 | struct root_device { | |
2302 | struct device dev; | |
2303 | struct module *owner; | |
2304 | }; | |
2305 | ||
2306 | static inline struct root_device *to_root_device(struct device *d) | |
2307 | { | |
2308 | return container_of(d, struct root_device, dev); | |
2309 | } | |
2310 | ||
2311 | static void root_device_release(struct device *dev) | |
2312 | { | |
2313 | kfree(to_root_device(dev)); | |
2314 | } | |
2315 | ||
2316 | /** | |
2317 | * __root_device_register - allocate and register a root device | |
2318 | * @name: root device name | |
2319 | * @owner: owner module of the root device, usually THIS_MODULE | |
2320 | * | |
2321 | * This function allocates a root device and registers it | |
2322 | * using device_register(). In order to free the returned | |
2323 | * device, use root_device_unregister(). | |
2324 | * | |
2325 | * Root devices are dummy devices which allow other devices | |
2326 | * to be grouped under /sys/devices. Use this function to | |
2327 | * allocate a root device and then use it as the parent of | |
2328 | * any device which should appear under /sys/devices/{name} | |
2329 | * | |
2330 | * The /sys/devices/{name} directory will also contain a | |
2331 | * 'module' symlink which points to the @owner directory | |
2332 | * in sysfs. | |
2333 | * | |
2334 | * Returns &struct device pointer on success, or ERR_PTR() on error. | |
2335 | * | |
2336 | * Note: You probably want to use root_device_register(). | |
2337 | */ | |
2338 | struct device *__root_device_register(const char *name, struct module *owner) | |
2339 | { | |
2340 | struct root_device *root; | |
2341 | int err = -ENOMEM; | |
2342 | ||
2343 | root = kzalloc(sizeof(struct root_device), GFP_KERNEL); | |
2344 | if (!root) | |
2345 | return ERR_PTR(err); | |
2346 | ||
2347 | err = dev_set_name(&root->dev, "%s", name); | |
2348 | if (err) { | |
2349 | kfree(root); | |
2350 | return ERR_PTR(err); | |
2351 | } | |
2352 | ||
2353 | root->dev.release = root_device_release; | |
2354 | ||
2355 | err = device_register(&root->dev); | |
2356 | if (err) { | |
2357 | put_device(&root->dev); | |
2358 | return ERR_PTR(err); | |
2359 | } | |
2360 | ||
2361 | #ifdef CONFIG_MODULES /* gotta find a "cleaner" way to do this */ | |
2362 | if (owner) { | |
2363 | struct module_kobject *mk = &owner->mkobj; | |
2364 | ||
2365 | err = sysfs_create_link(&root->dev.kobj, &mk->kobj, "module"); | |
2366 | if (err) { | |
2367 | device_unregister(&root->dev); | |
2368 | return ERR_PTR(err); | |
2369 | } | |
2370 | root->owner = owner; | |
2371 | } | |
2372 | #endif | |
2373 | ||
2374 | return &root->dev; | |
2375 | } | |
2376 | EXPORT_SYMBOL_GPL(__root_device_register); | |
2377 | ||
2378 | /** | |
2379 | * root_device_unregister - unregister and free a root device | |
2380 | * @dev: device going away | |
2381 | * | |
2382 | * This function unregisters and cleans up a device that was created by | |
2383 | * root_device_register(). | |
2384 | */ | |
2385 | void root_device_unregister(struct device *dev) | |
2386 | { | |
2387 | struct root_device *root = to_root_device(dev); | |
2388 | ||
2389 | if (root->owner) | |
2390 | sysfs_remove_link(&root->dev.kobj, "module"); | |
2391 | ||
2392 | device_unregister(dev); | |
2393 | } | |
2394 | EXPORT_SYMBOL_GPL(root_device_unregister); | |
2395 | ||
2396 | ||
2397 | static void device_create_release(struct device *dev) | |
2398 | { | |
2399 | pr_debug("device: '%s': %s\n", dev_name(dev), __func__); | |
2400 | kfree(dev); | |
2401 | } | |
2402 | ||
2403 | static struct device * | |
2404 | device_create_groups_vargs(struct class *class, struct device *parent, | |
2405 | dev_t devt, void *drvdata, | |
2406 | const struct attribute_group **groups, | |
2407 | const char *fmt, va_list args) | |
2408 | { | |
2409 | struct device *dev = NULL; | |
2410 | int retval = -ENODEV; | |
2411 | ||
2412 | if (class == NULL || IS_ERR(class)) | |
2413 | goto error; | |
2414 | ||
2415 | dev = kzalloc(sizeof(*dev), GFP_KERNEL); | |
2416 | if (!dev) { | |
2417 | retval = -ENOMEM; | |
2418 | goto error; | |
2419 | } | |
2420 | ||
2421 | device_initialize(dev); | |
2422 | dev->devt = devt; | |
2423 | dev->class = class; | |
2424 | dev->parent = parent; | |
2425 | dev->groups = groups; | |
2426 | dev->release = device_create_release; | |
2427 | dev_set_drvdata(dev, drvdata); | |
2428 | ||
2429 | retval = kobject_set_name_vargs(&dev->kobj, fmt, args); | |
2430 | if (retval) | |
2431 | goto error; | |
2432 | ||
2433 | retval = device_add(dev); | |
2434 | if (retval) | |
2435 | goto error; | |
2436 | ||
2437 | return dev; | |
2438 | ||
2439 | error: | |
2440 | put_device(dev); | |
2441 | return ERR_PTR(retval); | |
2442 | } | |
2443 | ||
2444 | /** | |
2445 | * device_create_vargs - creates a device and registers it with sysfs | |
2446 | * @class: pointer to the struct class that this device should be registered to | |
2447 | * @parent: pointer to the parent struct device of this new device, if any | |
2448 | * @devt: the dev_t for the char device to be added | |
2449 | * @drvdata: the data to be added to the device for callbacks | |
2450 | * @fmt: string for the device's name | |
2451 | * @args: va_list for the device's name | |
2452 | * | |
2453 | * This function can be used by char device classes. A struct device | |
2454 | * will be created in sysfs, registered to the specified class. | |
2455 | * | |
2456 | * A "dev" file will be created, showing the dev_t for the device, if | |
2457 | * the dev_t is not 0,0. | |
2458 | * If a pointer to a parent struct device is passed in, the newly created | |
2459 | * struct device will be a child of that device in sysfs. | |
2460 | * The pointer to the struct device will be returned from the call. | |
2461 | * Any further sysfs files that might be required can be created using this | |
2462 | * pointer. | |
2463 | * | |
2464 | * Returns &struct device pointer on success, or ERR_PTR() on error. | |
2465 | * | |
2466 | * Note: the struct class passed to this function must have previously | |
2467 | * been created with a call to class_create(). | |
2468 | */ | |
2469 | struct device *device_create_vargs(struct class *class, struct device *parent, | |
2470 | dev_t devt, void *drvdata, const char *fmt, | |
2471 | va_list args) | |
2472 | { | |
2473 | return device_create_groups_vargs(class, parent, devt, drvdata, NULL, | |
2474 | fmt, args); | |
2475 | } | |
2476 | EXPORT_SYMBOL_GPL(device_create_vargs); | |
2477 | ||
2478 | /** | |
2479 | * device_create - creates a device and registers it with sysfs | |
2480 | * @class: pointer to the struct class that this device should be registered to | |
2481 | * @parent: pointer to the parent struct device of this new device, if any | |
2482 | * @devt: the dev_t for the char device to be added | |
2483 | * @drvdata: the data to be added to the device for callbacks | |
2484 | * @fmt: string for the device's name | |
2485 | * | |
2486 | * This function can be used by char device classes. A struct device | |
2487 | * will be created in sysfs, registered to the specified class. | |
2488 | * | |
2489 | * A "dev" file will be created, showing the dev_t for the device, if | |
2490 | * the dev_t is not 0,0. | |
2491 | * If a pointer to a parent struct device is passed in, the newly created | |
2492 | * struct device will be a child of that device in sysfs. | |
2493 | * The pointer to the struct device will be returned from the call. | |
2494 | * Any further sysfs files that might be required can be created using this | |
2495 | * pointer. | |
2496 | * | |
2497 | * Returns &struct device pointer on success, or ERR_PTR() on error. | |
2498 | * | |
2499 | * Note: the struct class passed to this function must have previously | |
2500 | * been created with a call to class_create(). | |
2501 | */ | |
2502 | struct device *device_create(struct class *class, struct device *parent, | |
2503 | dev_t devt, void *drvdata, const char *fmt, ...) | |
2504 | { | |
2505 | va_list vargs; | |
2506 | struct device *dev; | |
2507 | ||
2508 | va_start(vargs, fmt); | |
2509 | dev = device_create_vargs(class, parent, devt, drvdata, fmt, vargs); | |
2510 | va_end(vargs); | |
2511 | return dev; | |
2512 | } | |
2513 | EXPORT_SYMBOL_GPL(device_create); | |
2514 | ||
2515 | /** | |
2516 | * device_create_with_groups - creates a device and registers it with sysfs | |
2517 | * @class: pointer to the struct class that this device should be registered to | |
2518 | * @parent: pointer to the parent struct device of this new device, if any | |
2519 | * @devt: the dev_t for the char device to be added | |
2520 | * @drvdata: the data to be added to the device for callbacks | |
2521 | * @groups: NULL-terminated list of attribute groups to be created | |
2522 | * @fmt: string for the device's name | |
2523 | * | |
2524 | * This function can be used by char device classes. A struct device | |
2525 | * will be created in sysfs, registered to the specified class. | |
2526 | * Additional attributes specified in the groups parameter will also | |
2527 | * be created automatically. | |
2528 | * | |
2529 | * A "dev" file will be created, showing the dev_t for the device, if | |
2530 | * the dev_t is not 0,0. | |
2531 | * If a pointer to a parent struct device is passed in, the newly created | |
2532 | * struct device will be a child of that device in sysfs. | |
2533 | * The pointer to the struct device will be returned from the call. | |
2534 | * Any further sysfs files that might be required can be created using this | |
2535 | * pointer. | |
2536 | * | |
2537 | * Returns &struct device pointer on success, or ERR_PTR() on error. | |
2538 | * | |
2539 | * Note: the struct class passed to this function must have previously | |
2540 | * been created with a call to class_create(). | |
2541 | */ | |
2542 | struct device *device_create_with_groups(struct class *class, | |
2543 | struct device *parent, dev_t devt, | |
2544 | void *drvdata, | |
2545 | const struct attribute_group **groups, | |
2546 | const char *fmt, ...) | |
2547 | { | |
2548 | va_list vargs; | |
2549 | struct device *dev; | |
2550 | ||
2551 | va_start(vargs, fmt); | |
2552 | dev = device_create_groups_vargs(class, parent, devt, drvdata, groups, | |
2553 | fmt, vargs); | |
2554 | va_end(vargs); | |
2555 | return dev; | |
2556 | } | |
2557 | EXPORT_SYMBOL_GPL(device_create_with_groups); | |
2558 | ||
2559 | static int __match_devt(struct device *dev, const void *data) | |
2560 | { | |
2561 | const dev_t *devt = data; | |
2562 | ||
2563 | return dev->devt == *devt; | |
2564 | } | |
2565 | ||
2566 | /** | |
2567 | * device_destroy - removes a device that was created with device_create() | |
2568 | * @class: pointer to the struct class that this device was registered with | |
2569 | * @devt: the dev_t of the device that was previously registered | |
2570 | * | |
2571 | * This call unregisters and cleans up a device that was created with a | |
2572 | * call to device_create(). | |
2573 | */ | |
2574 | void device_destroy(struct class *class, dev_t devt) | |
2575 | { | |
2576 | struct device *dev; | |
2577 | ||
2578 | dev = class_find_device(class, NULL, &devt, __match_devt); | |
2579 | if (dev) { | |
2580 | put_device(dev); | |
2581 | device_unregister(dev); | |
2582 | } | |
2583 | } | |
2584 | EXPORT_SYMBOL_GPL(device_destroy); | |
2585 | ||
2586 | /** | |
2587 | * device_rename - renames a device | |
2588 | * @dev: the pointer to the struct device to be renamed | |
2589 | * @new_name: the new name of the device | |
2590 | * | |
2591 | * It is the responsibility of the caller to provide mutual | |
2592 | * exclusion between two different calls of device_rename | |
2593 | * on the same device to ensure that new_name is valid and | |
2594 | * won't conflict with other devices. | |
2595 | * | |
2596 | * Note: Don't call this function. Currently, the networking layer calls this | |
2597 | * function, but that will change. The following text from Kay Sievers offers | |
2598 | * some insight: | |
2599 | * | |
2600 | * Renaming devices is racy at many levels, symlinks and other stuff are not | |
2601 | * replaced atomically, and you get a "move" uevent, but it's not easy to | |
2602 | * connect the event to the old and new device. Device nodes are not renamed at | |
2603 | * all, there isn't even support for that in the kernel now. | |
2604 | * | |
2605 | * In the meantime, during renaming, your target name might be taken by another | |
2606 | * driver, creating conflicts. Or the old name is taken directly after you | |
2607 | * renamed it -- then you get events for the same DEVPATH, before you even see | |
2608 | * the "move" event. It's just a mess, and nothing new should ever rely on | |
2609 | * kernel device renaming. Besides that, it's not even implemented now for | |
2610 | * other things than (driver-core wise very simple) network devices. | |
2611 | * | |
2612 | * We are currently about to change network renaming in udev to completely | |
2613 | * disallow renaming of devices in the same namespace as the kernel uses, | |
2614 | * because we can't solve the problems properly, that arise with swapping names | |
2615 | * of multiple interfaces without races. Means, renaming of eth[0-9]* will only | |
2616 | * be allowed to some other name than eth[0-9]*, for the aforementioned | |
2617 | * reasons. | |
2618 | * | |
2619 | * Make up a "real" name in the driver before you register anything, or add | |
2620 | * some other attributes for userspace to find the device, or use udev to add | |
2621 | * symlinks -- but never rename kernel devices later, it's a complete mess. We | |
2622 | * don't even want to get into that and try to implement the missing pieces in | |
2623 | * the core. We really have other pieces to fix in the driver core mess. :) | |
2624 | */ | |
2625 | int device_rename(struct device *dev, const char *new_name) | |
2626 | { | |
2627 | struct kobject *kobj = &dev->kobj; | |
2628 | char *old_device_name = NULL; | |
2629 | int error; | |
2630 | ||
2631 | dev = get_device(dev); | |
2632 | if (!dev) | |
2633 | return -EINVAL; | |
2634 | ||
2635 | dev_dbg(dev, "renaming to %s\n", new_name); | |
2636 | ||
2637 | old_device_name = kstrdup(dev_name(dev), GFP_KERNEL); | |
2638 | if (!old_device_name) { | |
2639 | error = -ENOMEM; | |
2640 | goto out; | |
2641 | } | |
2642 | ||
2643 | if (dev->class) { | |
2644 | error = sysfs_rename_link_ns(&dev->class->p->subsys.kobj, | |
2645 | kobj, old_device_name, | |
2646 | new_name, kobject_namespace(kobj)); | |
2647 | if (error) | |
2648 | goto out; | |
2649 | } | |
2650 | ||
2651 | error = kobject_rename(kobj, new_name); | |
2652 | if (error) | |
2653 | goto out; | |
2654 | ||
2655 | out: | |
2656 | put_device(dev); | |
2657 | ||
2658 | kfree(old_device_name); | |
2659 | ||
2660 | return error; | |
2661 | } | |
2662 | EXPORT_SYMBOL_GPL(device_rename); | |
2663 | ||
2664 | static int device_move_class_links(struct device *dev, | |
2665 | struct device *old_parent, | |
2666 | struct device *new_parent) | |
2667 | { | |
2668 | int error = 0; | |
2669 | ||
2670 | if (old_parent) | |
2671 | sysfs_remove_link(&dev->kobj, "device"); | |
2672 | if (new_parent) | |
2673 | error = sysfs_create_link(&dev->kobj, &new_parent->kobj, | |
2674 | "device"); | |
2675 | return error; | |
2676 | } | |
2677 | ||
2678 | /** | |
2679 | * device_move - moves a device to a new parent | |
2680 | * @dev: the pointer to the struct device to be moved | |
2681 | * @new_parent: the new parent of the device (can by NULL) | |
2682 | * @dpm_order: how to reorder the dpm_list | |
2683 | */ | |
2684 | int device_move(struct device *dev, struct device *new_parent, | |
2685 | enum dpm_order dpm_order) | |
2686 | { | |
2687 | int error; | |
2688 | struct device *old_parent; | |
2689 | struct kobject *new_parent_kobj; | |
2690 | ||
2691 | dev = get_device(dev); | |
2692 | if (!dev) | |
2693 | return -EINVAL; | |
2694 | ||
2695 | device_pm_lock(); | |
2696 | new_parent = get_device(new_parent); | |
2697 | new_parent_kobj = get_device_parent(dev, new_parent); | |
2698 | ||
2699 | pr_debug("device: '%s': %s: moving to '%s'\n", dev_name(dev), | |
2700 | __func__, new_parent ? dev_name(new_parent) : "<NULL>"); | |
2701 | error = kobject_move(&dev->kobj, new_parent_kobj); | |
2702 | if (error) { | |
2703 | cleanup_glue_dir(dev, new_parent_kobj); | |
2704 | put_device(new_parent); | |
2705 | goto out; | |
2706 | } | |
2707 | old_parent = dev->parent; | |
2708 | dev->parent = new_parent; | |
2709 | if (old_parent) | |
2710 | klist_remove(&dev->p->knode_parent); | |
2711 | if (new_parent) { | |
2712 | klist_add_tail(&dev->p->knode_parent, | |
2713 | &new_parent->p->klist_children); | |
2714 | set_dev_node(dev, dev_to_node(new_parent)); | |
2715 | } | |
2716 | ||
2717 | if (dev->class) { | |
2718 | error = device_move_class_links(dev, old_parent, new_parent); | |
2719 | if (error) { | |
2720 | /* We ignore errors on cleanup since we're hosed anyway... */ | |
2721 | device_move_class_links(dev, new_parent, old_parent); | |
2722 | if (!kobject_move(&dev->kobj, &old_parent->kobj)) { | |
2723 | if (new_parent) | |
2724 | klist_remove(&dev->p->knode_parent); | |
2725 | dev->parent = old_parent; | |
2726 | if (old_parent) { | |
2727 | klist_add_tail(&dev->p->knode_parent, | |
2728 | &old_parent->p->klist_children); | |
2729 | set_dev_node(dev, dev_to_node(old_parent)); | |
2730 | } | |
2731 | } | |
2732 | cleanup_glue_dir(dev, new_parent_kobj); | |
2733 | put_device(new_parent); | |
2734 | goto out; | |
2735 | } | |
2736 | } | |
2737 | switch (dpm_order) { | |
2738 | case DPM_ORDER_NONE: | |
2739 | break; | |
2740 | case DPM_ORDER_DEV_AFTER_PARENT: | |
2741 | device_pm_move_after(dev, new_parent); | |
2742 | devices_kset_move_after(dev, new_parent); | |
2743 | break; | |
2744 | case DPM_ORDER_PARENT_BEFORE_DEV: | |
2745 | device_pm_move_before(new_parent, dev); | |
2746 | devices_kset_move_before(new_parent, dev); | |
2747 | break; | |
2748 | case DPM_ORDER_DEV_LAST: | |
2749 | device_pm_move_last(dev); | |
2750 | devices_kset_move_last(dev); | |
2751 | break; | |
2752 | } | |
2753 | ||
2754 | put_device(old_parent); | |
2755 | out: | |
2756 | device_pm_unlock(); | |
2757 | put_device(dev); | |
2758 | return error; | |
2759 | } | |
2760 | EXPORT_SYMBOL_GPL(device_move); | |
2761 | ||
2762 | /** | |
2763 | * device_shutdown - call ->shutdown() on each device to shutdown. | |
2764 | */ | |
2765 | void device_shutdown(void) | |
2766 | { | |
2767 | struct device *dev, *parent; | |
2768 | ||
2769 | spin_lock(&devices_kset->list_lock); | |
2770 | /* | |
2771 | * Walk the devices list backward, shutting down each in turn. | |
2772 | * Beware that device unplug events may also start pulling | |
2773 | * devices offline, even as the system is shutting down. | |
2774 | */ | |
2775 | while (!list_empty(&devices_kset->list)) { | |
2776 | dev = list_entry(devices_kset->list.prev, struct device, | |
2777 | kobj.entry); | |
2778 | ||
2779 | /* | |
2780 | * hold reference count of device's parent to | |
2781 | * prevent it from being freed because parent's | |
2782 | * lock is to be held | |
2783 | */ | |
2784 | parent = get_device(dev->parent); | |
2785 | get_device(dev); | |
2786 | /* | |
2787 | * Make sure the device is off the kset list, in the | |
2788 | * event that dev->*->shutdown() doesn't remove it. | |
2789 | */ | |
2790 | list_del_init(&dev->kobj.entry); | |
2791 | spin_unlock(&devices_kset->list_lock); | |
2792 | ||
2793 | /* hold lock to avoid race with probe/release */ | |
2794 | if (parent) | |
2795 | device_lock(parent); | |
2796 | device_lock(dev); | |
2797 | ||
2798 | /* Don't allow any more runtime suspends */ | |
2799 | pm_runtime_get_noresume(dev); | |
2800 | pm_runtime_barrier(dev); | |
2801 | ||
2802 | if (dev->class && dev->class->shutdown_pre) { | |
2803 | if (initcall_debug) | |
2804 | dev_info(dev, "shutdown_pre\n"); | |
2805 | dev->class->shutdown_pre(dev); | |
2806 | } | |
2807 | if (dev->bus && dev->bus->shutdown) { | |
2808 | if (initcall_debug) | |
2809 | dev_info(dev, "shutdown\n"); | |
2810 | dev->bus->shutdown(dev); | |
2811 | } else if (dev->driver && dev->driver->shutdown) { | |
2812 | if (initcall_debug) | |
2813 | dev_info(dev, "shutdown\n"); | |
2814 | dev->driver->shutdown(dev); | |
2815 | } | |
2816 | ||
2817 | device_unlock(dev); | |
2818 | if (parent) | |
2819 | device_unlock(parent); | |
2820 | ||
2821 | put_device(dev); | |
2822 | put_device(parent); | |
2823 | ||
2824 | spin_lock(&devices_kset->list_lock); | |
2825 | } | |
2826 | spin_unlock(&devices_kset->list_lock); | |
2827 | } | |
2828 | ||
2829 | /* | |
2830 | * Device logging functions | |
2831 | */ | |
2832 | ||
2833 | #ifdef CONFIG_PRINTK | |
2834 | static int | |
2835 | create_syslog_header(const struct device *dev, char *hdr, size_t hdrlen) | |
2836 | { | |
2837 | const char *subsys; | |
2838 | size_t pos = 0; | |
2839 | ||
2840 | if (dev->class) | |
2841 | subsys = dev->class->name; | |
2842 | else if (dev->bus) | |
2843 | subsys = dev->bus->name; | |
2844 | else | |
2845 | return 0; | |
2846 | ||
2847 | pos += snprintf(hdr + pos, hdrlen - pos, "SUBSYSTEM=%s", subsys); | |
2848 | if (pos >= hdrlen) | |
2849 | goto overflow; | |
2850 | ||
2851 | /* | |
2852 | * Add device identifier DEVICE=: | |
2853 | * b12:8 block dev_t | |
2854 | * c127:3 char dev_t | |
2855 | * n8 netdev ifindex | |
2856 | * +sound:card0 subsystem:devname | |
2857 | */ | |
2858 | if (MAJOR(dev->devt)) { | |
2859 | char c; | |
2860 | ||
2861 | if (strcmp(subsys, "block") == 0) | |
2862 | c = 'b'; | |
2863 | else | |
2864 | c = 'c'; | |
2865 | pos++; | |
2866 | pos += snprintf(hdr + pos, hdrlen - pos, | |
2867 | "DEVICE=%c%u:%u", | |
2868 | c, MAJOR(dev->devt), MINOR(dev->devt)); | |
2869 | } else if (strcmp(subsys, "net") == 0) { | |
2870 | struct net_device *net = to_net_dev(dev); | |
2871 | ||
2872 | pos++; | |
2873 | pos += snprintf(hdr + pos, hdrlen - pos, | |
2874 | "DEVICE=n%u", net->ifindex); | |
2875 | } else { | |
2876 | pos++; | |
2877 | pos += snprintf(hdr + pos, hdrlen - pos, | |
2878 | "DEVICE=+%s:%s", subsys, dev_name(dev)); | |
2879 | } | |
2880 | ||
2881 | if (pos >= hdrlen) | |
2882 | goto overflow; | |
2883 | ||
2884 | return pos; | |
2885 | ||
2886 | overflow: | |
2887 | dev_WARN(dev, "device/subsystem name too long"); | |
2888 | return 0; | |
2889 | } | |
2890 | ||
2891 | int dev_vprintk_emit(int level, const struct device *dev, | |
2892 | const char *fmt, va_list args) | |
2893 | { | |
2894 | char hdr[128]; | |
2895 | size_t hdrlen; | |
2896 | ||
2897 | hdrlen = create_syslog_header(dev, hdr, sizeof(hdr)); | |
2898 | ||
2899 | return vprintk_emit(0, level, hdrlen ? hdr : NULL, hdrlen, fmt, args); | |
2900 | } | |
2901 | EXPORT_SYMBOL(dev_vprintk_emit); | |
2902 | ||
2903 | int dev_printk_emit(int level, const struct device *dev, const char *fmt, ...) | |
2904 | { | |
2905 | va_list args; | |
2906 | int r; | |
2907 | ||
2908 | va_start(args, fmt); | |
2909 | ||
2910 | r = dev_vprintk_emit(level, dev, fmt, args); | |
2911 | ||
2912 | va_end(args); | |
2913 | ||
2914 | return r; | |
2915 | } | |
2916 | EXPORT_SYMBOL(dev_printk_emit); | |
2917 | ||
2918 | static void __dev_printk(const char *level, const struct device *dev, | |
2919 | struct va_format *vaf) | |
2920 | { | |
2921 | if (dev) | |
2922 | dev_printk_emit(level[1] - '0', dev, "%s %s: %pV", | |
2923 | dev_driver_string(dev), dev_name(dev), vaf); | |
2924 | else | |
2925 | printk("%s(NULL device *): %pV", level, vaf); | |
2926 | } | |
2927 | ||
2928 | void dev_printk(const char *level, const struct device *dev, | |
2929 | const char *fmt, ...) | |
2930 | { | |
2931 | struct va_format vaf; | |
2932 | va_list args; | |
2933 | ||
2934 | va_start(args, fmt); | |
2935 | ||
2936 | vaf.fmt = fmt; | |
2937 | vaf.va = &args; | |
2938 | ||
2939 | __dev_printk(level, dev, &vaf); | |
2940 | ||
2941 | va_end(args); | |
2942 | } | |
2943 | EXPORT_SYMBOL(dev_printk); | |
2944 | ||
2945 | #define define_dev_printk_level(func, kern_level) \ | |
2946 | void func(const struct device *dev, const char *fmt, ...) \ | |
2947 | { \ | |
2948 | struct va_format vaf; \ | |
2949 | va_list args; \ | |
2950 | \ | |
2951 | va_start(args, fmt); \ | |
2952 | \ | |
2953 | vaf.fmt = fmt; \ | |
2954 | vaf.va = &args; \ | |
2955 | \ | |
2956 | __dev_printk(kern_level, dev, &vaf); \ | |
2957 | \ | |
2958 | va_end(args); \ | |
2959 | } \ | |
2960 | EXPORT_SYMBOL(func); | |
2961 | ||
2962 | define_dev_printk_level(dev_emerg, KERN_EMERG); | |
2963 | define_dev_printk_level(dev_alert, KERN_ALERT); | |
2964 | define_dev_printk_level(dev_crit, KERN_CRIT); | |
2965 | define_dev_printk_level(dev_err, KERN_ERR); | |
2966 | define_dev_printk_level(dev_warn, KERN_WARNING); | |
2967 | define_dev_printk_level(dev_notice, KERN_NOTICE); | |
2968 | define_dev_printk_level(_dev_info, KERN_INFO); | |
2969 | ||
2970 | #endif | |
2971 | ||
2972 | static inline bool fwnode_is_primary(struct fwnode_handle *fwnode) | |
2973 | { | |
2974 | return fwnode && !IS_ERR(fwnode->secondary); | |
2975 | } | |
2976 | ||
2977 | /** | |
2978 | * set_primary_fwnode - Change the primary firmware node of a given device. | |
2979 | * @dev: Device to handle. | |
2980 | * @fwnode: New primary firmware node of the device. | |
2981 | * | |
2982 | * Set the device's firmware node pointer to @fwnode, but if a secondary | |
2983 | * firmware node of the device is present, preserve it. | |
2984 | */ | |
2985 | void set_primary_fwnode(struct device *dev, struct fwnode_handle *fwnode) | |
2986 | { | |
2987 | if (fwnode) { | |
2988 | struct fwnode_handle *fn = dev->fwnode; | |
2989 | ||
2990 | if (fwnode_is_primary(fn)) | |
2991 | fn = fn->secondary; | |
2992 | ||
2993 | if (fn) { | |
2994 | WARN_ON(fwnode->secondary); | |
2995 | fwnode->secondary = fn; | |
2996 | } | |
2997 | dev->fwnode = fwnode; | |
2998 | } else { | |
2999 | dev->fwnode = fwnode_is_primary(dev->fwnode) ? | |
3000 | dev->fwnode->secondary : NULL; | |
3001 | } | |
3002 | } | |
3003 | EXPORT_SYMBOL_GPL(set_primary_fwnode); | |
3004 | ||
3005 | /** | |
3006 | * set_secondary_fwnode - Change the secondary firmware node of a given device. | |
3007 | * @dev: Device to handle. | |
3008 | * @fwnode: New secondary firmware node of the device. | |
3009 | * | |
3010 | * If a primary firmware node of the device is present, set its secondary | |
3011 | * pointer to @fwnode. Otherwise, set the device's firmware node pointer to | |
3012 | * @fwnode. | |
3013 | */ | |
3014 | void set_secondary_fwnode(struct device *dev, struct fwnode_handle *fwnode) | |
3015 | { | |
3016 | if (fwnode) | |
3017 | fwnode->secondary = ERR_PTR(-ENODEV); | |
3018 | ||
3019 | if (fwnode_is_primary(dev->fwnode)) | |
3020 | dev->fwnode->secondary = fwnode; | |
3021 | else | |
3022 | dev->fwnode = fwnode; | |
3023 | } | |
3024 | ||
3025 | /** | |
3026 | * device_set_of_node_from_dev - reuse device-tree node of another device | |
3027 | * @dev: device whose device-tree node is being set | |
3028 | * @dev2: device whose device-tree node is being reused | |
3029 | * | |
3030 | * Takes another reference to the new device-tree node after first dropping | |
3031 | * any reference held to the old node. | |
3032 | */ | |
3033 | void device_set_of_node_from_dev(struct device *dev, const struct device *dev2) | |
3034 | { | |
3035 | of_node_put(dev->of_node); | |
3036 | dev->of_node = of_node_get(dev2->of_node); | |
3037 | dev->of_node_reused = true; | |
3038 | } | |
3039 | EXPORT_SYMBOL_GPL(device_set_of_node_from_dev); |