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1da177e4 LT |
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 | |
64bb5d2c GKH |
6 | * Copyright (c) 2006 Greg Kroah-Hartman <gregkh@suse.de> |
7 | * Copyright (c) 2006 Novell, Inc. | |
1da177e4 LT |
8 | * |
9 | * This file is released under the GPLv2 | |
10 | * | |
11 | */ | |
12 | ||
1da177e4 LT |
13 | #include <linux/device.h> |
14 | #include <linux/err.h> | |
97badf87 | 15 | #include <linux/fwnode.h> |
1da177e4 LT |
16 | #include <linux/init.h> |
17 | #include <linux/module.h> | |
18 | #include <linux/slab.h> | |
19 | #include <linux/string.h> | |
23681e47 | 20 | #include <linux/kdev_t.h> |
116af378 | 21 | #include <linux/notifier.h> |
07d57a32 GL |
22 | #include <linux/of.h> |
23 | #include <linux/of_device.h> | |
da231fd5 | 24 | #include <linux/genhd.h> |
815d2d50 | 25 | #include <linux/kallsyms.h> |
f75b1c60 | 26 | #include <linux/mutex.h> |
af8db150 | 27 | #include <linux/pm_runtime.h> |
c4e00daa | 28 | #include <linux/netdevice.h> |
63967685 | 29 | #include <linux/sysfs.h> |
1da177e4 LT |
30 | |
31 | #include "base.h" | |
32 | #include "power/power.h" | |
33 | ||
e52eec13 AK |
34 | #ifdef CONFIG_SYSFS_DEPRECATED |
35 | #ifdef CONFIG_SYSFS_DEPRECATED_V2 | |
36 | long sysfs_deprecated = 1; | |
37 | #else | |
38 | long sysfs_deprecated = 0; | |
39 | #endif | |
3454bf96 | 40 | static int __init sysfs_deprecated_setup(char *arg) |
e52eec13 | 41 | { |
34da5e67 | 42 | return kstrtol(arg, 10, &sysfs_deprecated); |
e52eec13 AK |
43 | } |
44 | early_param("sysfs.deprecated", sysfs_deprecated_setup); | |
45 | #endif | |
46 | ||
9ed98953 RW |
47 | /* Device links support. */ |
48 | ||
49 | #ifdef CONFIG_SRCU | |
50 | static DEFINE_MUTEX(device_links_lock); | |
51 | DEFINE_STATIC_SRCU(device_links_srcu); | |
52 | ||
53 | static inline void device_links_write_lock(void) | |
54 | { | |
55 | mutex_lock(&device_links_lock); | |
56 | } | |
57 | ||
58 | static inline void device_links_write_unlock(void) | |
59 | { | |
60 | mutex_unlock(&device_links_lock); | |
61 | } | |
62 | ||
63 | int device_links_read_lock(void) | |
64 | { | |
65 | return srcu_read_lock(&device_links_srcu); | |
66 | } | |
67 | ||
68 | void device_links_read_unlock(int idx) | |
69 | { | |
70 | srcu_read_unlock(&device_links_srcu, idx); | |
71 | } | |
72 | #else /* !CONFIG_SRCU */ | |
73 | static DECLARE_RWSEM(device_links_lock); | |
74 | ||
75 | static inline void device_links_write_lock(void) | |
76 | { | |
77 | down_write(&device_links_lock); | |
78 | } | |
79 | ||
80 | static inline void device_links_write_unlock(void) | |
81 | { | |
82 | up_write(&device_links_lock); | |
83 | } | |
84 | ||
85 | int device_links_read_lock(void) | |
86 | { | |
87 | down_read(&device_links_lock); | |
88 | return 0; | |
89 | } | |
90 | ||
91 | void device_links_read_unlock(int not_used) | |
92 | { | |
93 | up_read(&device_links_lock); | |
94 | } | |
95 | #endif /* !CONFIG_SRCU */ | |
96 | ||
97 | /** | |
98 | * device_is_dependent - Check if one device depends on another one | |
99 | * @dev: Device to check dependencies for. | |
100 | * @target: Device to check against. | |
101 | * | |
102 | * Check if @target depends on @dev or any device dependent on it (its child or | |
103 | * its consumer etc). Return 1 if that is the case or 0 otherwise. | |
104 | */ | |
105 | static int device_is_dependent(struct device *dev, void *target) | |
106 | { | |
107 | struct device_link *link; | |
108 | int ret; | |
109 | ||
110 | if (WARN_ON(dev == target)) | |
111 | return 1; | |
112 | ||
113 | ret = device_for_each_child(dev, target, device_is_dependent); | |
114 | if (ret) | |
115 | return ret; | |
116 | ||
117 | list_for_each_entry(link, &dev->links.consumers, s_node) { | |
118 | if (WARN_ON(link->consumer == target)) | |
119 | return 1; | |
120 | ||
121 | ret = device_is_dependent(link->consumer, target); | |
122 | if (ret) | |
123 | break; | |
124 | } | |
125 | return ret; | |
126 | } | |
127 | ||
128 | static int device_reorder_to_tail(struct device *dev, void *not_used) | |
129 | { | |
130 | struct device_link *link; | |
131 | ||
132 | /* | |
133 | * Devices that have not been registered yet will be put to the ends | |
134 | * of the lists during the registration, so skip them here. | |
135 | */ | |
136 | if (device_is_registered(dev)) | |
137 | devices_kset_move_last(dev); | |
138 | ||
139 | if (device_pm_initialized(dev)) | |
140 | device_pm_move_last(dev); | |
141 | ||
142 | device_for_each_child(dev, NULL, device_reorder_to_tail); | |
143 | list_for_each_entry(link, &dev->links.consumers, s_node) | |
144 | device_reorder_to_tail(link->consumer, NULL); | |
145 | ||
146 | return 0; | |
147 | } | |
148 | ||
149 | /** | |
150 | * device_link_add - Create a link between two devices. | |
151 | * @consumer: Consumer end of the link. | |
152 | * @supplier: Supplier end of the link. | |
153 | * @flags: Link flags. | |
154 | * | |
155 | * If the DL_FLAG_AUTOREMOVE is set, the link will be removed automatically | |
156 | * when the consumer device driver unbinds from it. The combination of both | |
157 | * DL_FLAG_AUTOREMOVE and DL_FLAG_STATELESS set is invalid and will cause NULL | |
158 | * to be returned. | |
159 | * | |
160 | * A side effect of the link creation is re-ordering of dpm_list and the | |
161 | * devices_kset list by moving the consumer device and all devices depending | |
162 | * on it to the ends of these lists (that does not happen to devices that have | |
163 | * not been registered when this function is called). | |
164 | * | |
165 | * The supplier device is required to be registered when this function is called | |
166 | * and NULL will be returned if that is not the case. The consumer device need | |
167 | * not be registerd, however. | |
168 | */ | |
169 | struct device_link *device_link_add(struct device *consumer, | |
170 | struct device *supplier, u32 flags) | |
171 | { | |
172 | struct device_link *link; | |
173 | ||
174 | if (!consumer || !supplier || | |
175 | ((flags & DL_FLAG_STATELESS) && (flags & DL_FLAG_AUTOREMOVE))) | |
176 | return NULL; | |
177 | ||
178 | device_links_write_lock(); | |
179 | device_pm_lock(); | |
180 | ||
181 | /* | |
182 | * If the supplier has not been fully registered yet or there is a | |
183 | * reverse dependency between the consumer and the supplier already in | |
184 | * the graph, return NULL. | |
185 | */ | |
186 | if (!device_pm_initialized(supplier) | |
187 | || device_is_dependent(consumer, supplier)) { | |
188 | link = NULL; | |
189 | goto out; | |
190 | } | |
191 | ||
192 | list_for_each_entry(link, &supplier->links.consumers, s_node) | |
193 | if (link->consumer == consumer) | |
194 | goto out; | |
195 | ||
196 | link = kmalloc(sizeof(*link), GFP_KERNEL); | |
197 | if (!link) | |
198 | goto out; | |
199 | ||
200 | get_device(supplier); | |
201 | link->supplier = supplier; | |
202 | INIT_LIST_HEAD(&link->s_node); | |
203 | get_device(consumer); | |
204 | link->consumer = consumer; | |
205 | INIT_LIST_HEAD(&link->c_node); | |
206 | link->flags = flags; | |
207 | ||
208 | /* Deterine the initial link state. */ | |
209 | if (flags & DL_FLAG_STATELESS) { | |
210 | link->status = DL_STATE_NONE; | |
211 | } else { | |
212 | switch (supplier->links.status) { | |
213 | case DL_DEV_DRIVER_BOUND: | |
214 | switch (consumer->links.status) { | |
215 | case DL_DEV_PROBING: | |
216 | link->status = DL_STATE_CONSUMER_PROBE; | |
217 | break; | |
218 | case DL_DEV_DRIVER_BOUND: | |
219 | link->status = DL_STATE_ACTIVE; | |
220 | break; | |
221 | default: | |
222 | link->status = DL_STATE_AVAILABLE; | |
223 | break; | |
224 | } | |
225 | break; | |
226 | case DL_DEV_UNBINDING: | |
227 | link->status = DL_STATE_SUPPLIER_UNBIND; | |
228 | break; | |
229 | default: | |
230 | link->status = DL_STATE_DORMANT; | |
231 | break; | |
232 | } | |
233 | } | |
234 | ||
235 | /* | |
236 | * Move the consumer and all of the devices depending on it to the end | |
237 | * of dpm_list and the devices_kset list. | |
238 | * | |
239 | * It is necessary to hold dpm_list locked throughout all that or else | |
240 | * we may end up suspending with a wrong ordering of it. | |
241 | */ | |
242 | device_reorder_to_tail(consumer, NULL); | |
243 | ||
244 | list_add_tail_rcu(&link->s_node, &supplier->links.consumers); | |
245 | list_add_tail_rcu(&link->c_node, &consumer->links.suppliers); | |
246 | ||
247 | dev_info(consumer, "Linked as a consumer to %s\n", dev_name(supplier)); | |
248 | ||
249 | out: | |
250 | device_pm_unlock(); | |
251 | device_links_write_unlock(); | |
252 | return link; | |
253 | } | |
254 | EXPORT_SYMBOL_GPL(device_link_add); | |
255 | ||
256 | static void device_link_free(struct device_link *link) | |
257 | { | |
258 | put_device(link->consumer); | |
259 | put_device(link->supplier); | |
260 | kfree(link); | |
261 | } | |
262 | ||
263 | #ifdef CONFIG_SRCU | |
264 | static void __device_link_free_srcu(struct rcu_head *rhead) | |
265 | { | |
266 | device_link_free(container_of(rhead, struct device_link, rcu_head)); | |
267 | } | |
268 | ||
269 | static void __device_link_del(struct device_link *link) | |
270 | { | |
271 | dev_info(link->consumer, "Dropping the link to %s\n", | |
272 | dev_name(link->supplier)); | |
273 | ||
274 | list_del_rcu(&link->s_node); | |
275 | list_del_rcu(&link->c_node); | |
276 | call_srcu(&device_links_srcu, &link->rcu_head, __device_link_free_srcu); | |
277 | } | |
278 | #else /* !CONFIG_SRCU */ | |
279 | static void __device_link_del(struct device_link *link) | |
280 | { | |
281 | dev_info(link->consumer, "Dropping the link to %s\n", | |
282 | dev_name(link->supplier)); | |
283 | ||
284 | list_del(&link->s_node); | |
285 | list_del(&link->c_node); | |
286 | device_link_free(link); | |
287 | } | |
288 | #endif /* !CONFIG_SRCU */ | |
289 | ||
290 | /** | |
291 | * device_link_del - Delete a link between two devices. | |
292 | * @link: Device link to delete. | |
293 | * | |
294 | * The caller must ensure proper synchronization of this function with runtime | |
295 | * PM. | |
296 | */ | |
297 | void device_link_del(struct device_link *link) | |
298 | { | |
299 | device_links_write_lock(); | |
300 | device_pm_lock(); | |
301 | __device_link_del(link); | |
302 | device_pm_unlock(); | |
303 | device_links_write_unlock(); | |
304 | } | |
305 | EXPORT_SYMBOL_GPL(device_link_del); | |
306 | ||
307 | static void device_links_missing_supplier(struct device *dev) | |
308 | { | |
309 | struct device_link *link; | |
310 | ||
311 | list_for_each_entry(link, &dev->links.suppliers, c_node) | |
312 | if (link->status == DL_STATE_CONSUMER_PROBE) | |
313 | WRITE_ONCE(link->status, DL_STATE_AVAILABLE); | |
314 | } | |
315 | ||
316 | /** | |
317 | * device_links_check_suppliers - Check presence of supplier drivers. | |
318 | * @dev: Consumer device. | |
319 | * | |
320 | * Check links from this device to any suppliers. Walk the list of the device's | |
321 | * links to suppliers and see if all of them are available. If not, simply | |
322 | * return -EPROBE_DEFER. | |
323 | * | |
324 | * We need to guarantee that the supplier will not go away after the check has | |
325 | * been positive here. It only can go away in __device_release_driver() and | |
326 | * that function checks the device's links to consumers. This means we need to | |
327 | * mark the link as "consumer probe in progress" to make the supplier removal | |
328 | * wait for us to complete (or bad things may happen). | |
329 | * | |
330 | * Links with the DL_FLAG_STATELESS flag set are ignored. | |
331 | */ | |
332 | int device_links_check_suppliers(struct device *dev) | |
333 | { | |
334 | struct device_link *link; | |
335 | int ret = 0; | |
336 | ||
337 | device_links_write_lock(); | |
338 | ||
339 | list_for_each_entry(link, &dev->links.suppliers, c_node) { | |
340 | if (link->flags & DL_FLAG_STATELESS) | |
341 | continue; | |
342 | ||
343 | if (link->status != DL_STATE_AVAILABLE) { | |
344 | device_links_missing_supplier(dev); | |
345 | ret = -EPROBE_DEFER; | |
346 | break; | |
347 | } | |
348 | WRITE_ONCE(link->status, DL_STATE_CONSUMER_PROBE); | |
349 | } | |
350 | dev->links.status = DL_DEV_PROBING; | |
351 | ||
352 | device_links_write_unlock(); | |
353 | return ret; | |
354 | } | |
355 | ||
356 | /** | |
357 | * device_links_driver_bound - Update device links after probing its driver. | |
358 | * @dev: Device to update the links for. | |
359 | * | |
360 | * The probe has been successful, so update links from this device to any | |
361 | * consumers by changing their status to "available". | |
362 | * | |
363 | * Also change the status of @dev's links to suppliers to "active". | |
364 | * | |
365 | * Links with the DL_FLAG_STATELESS flag set are ignored. | |
366 | */ | |
367 | void device_links_driver_bound(struct device *dev) | |
368 | { | |
369 | struct device_link *link; | |
370 | ||
371 | device_links_write_lock(); | |
372 | ||
373 | list_for_each_entry(link, &dev->links.consumers, s_node) { | |
374 | if (link->flags & DL_FLAG_STATELESS) | |
375 | continue; | |
376 | ||
377 | WARN_ON(link->status != DL_STATE_DORMANT); | |
378 | WRITE_ONCE(link->status, DL_STATE_AVAILABLE); | |
379 | } | |
380 | ||
381 | list_for_each_entry(link, &dev->links.suppliers, c_node) { | |
382 | if (link->flags & DL_FLAG_STATELESS) | |
383 | continue; | |
384 | ||
385 | WARN_ON(link->status != DL_STATE_CONSUMER_PROBE); | |
386 | WRITE_ONCE(link->status, DL_STATE_ACTIVE); | |
387 | } | |
388 | ||
389 | dev->links.status = DL_DEV_DRIVER_BOUND; | |
390 | ||
391 | device_links_write_unlock(); | |
392 | } | |
393 | ||
394 | /** | |
395 | * __device_links_no_driver - Update links of a device without a driver. | |
396 | * @dev: Device without a drvier. | |
397 | * | |
398 | * Delete all non-persistent links from this device to any suppliers. | |
399 | * | |
400 | * Persistent links stay around, but their status is changed to "available", | |
401 | * unless they already are in the "supplier unbind in progress" state in which | |
402 | * case they need not be updated. | |
403 | * | |
404 | * Links with the DL_FLAG_STATELESS flag set are ignored. | |
405 | */ | |
406 | static void __device_links_no_driver(struct device *dev) | |
407 | { | |
408 | struct device_link *link, *ln; | |
409 | ||
410 | list_for_each_entry_safe_reverse(link, ln, &dev->links.suppliers, c_node) { | |
411 | if (link->flags & DL_FLAG_STATELESS) | |
412 | continue; | |
413 | ||
414 | if (link->flags & DL_FLAG_AUTOREMOVE) | |
415 | __device_link_del(link); | |
416 | else if (link->status != DL_STATE_SUPPLIER_UNBIND) | |
417 | WRITE_ONCE(link->status, DL_STATE_AVAILABLE); | |
418 | } | |
419 | ||
420 | dev->links.status = DL_DEV_NO_DRIVER; | |
421 | } | |
422 | ||
423 | void device_links_no_driver(struct device *dev) | |
424 | { | |
425 | device_links_write_lock(); | |
426 | __device_links_no_driver(dev); | |
427 | device_links_write_unlock(); | |
428 | } | |
429 | ||
430 | /** | |
431 | * device_links_driver_cleanup - Update links after driver removal. | |
432 | * @dev: Device whose driver has just gone away. | |
433 | * | |
434 | * Update links to consumers for @dev by changing their status to "dormant" and | |
435 | * invoke %__device_links_no_driver() to update links to suppliers for it as | |
436 | * appropriate. | |
437 | * | |
438 | * Links with the DL_FLAG_STATELESS flag set are ignored. | |
439 | */ | |
440 | void device_links_driver_cleanup(struct device *dev) | |
441 | { | |
442 | struct device_link *link; | |
443 | ||
444 | device_links_write_lock(); | |
445 | ||
446 | list_for_each_entry(link, &dev->links.consumers, s_node) { | |
447 | if (link->flags & DL_FLAG_STATELESS) | |
448 | continue; | |
449 | ||
450 | WARN_ON(link->flags & DL_FLAG_AUTOREMOVE); | |
451 | WARN_ON(link->status != DL_STATE_SUPPLIER_UNBIND); | |
452 | WRITE_ONCE(link->status, DL_STATE_DORMANT); | |
453 | } | |
454 | ||
455 | __device_links_no_driver(dev); | |
456 | ||
457 | device_links_write_unlock(); | |
458 | } | |
459 | ||
460 | /** | |
461 | * device_links_busy - Check if there are any busy links to consumers. | |
462 | * @dev: Device to check. | |
463 | * | |
464 | * Check each consumer of the device and return 'true' if its link's status | |
465 | * is one of "consumer probe" or "active" (meaning that the given consumer is | |
466 | * probing right now or its driver is present). Otherwise, change the link | |
467 | * state to "supplier unbind" to prevent the consumer from being probed | |
468 | * successfully going forward. | |
469 | * | |
470 | * Return 'false' if there are no probing or active consumers. | |
471 | * | |
472 | * Links with the DL_FLAG_STATELESS flag set are ignored. | |
473 | */ | |
474 | bool device_links_busy(struct device *dev) | |
475 | { | |
476 | struct device_link *link; | |
477 | bool ret = false; | |
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 | if (link->status == DL_STATE_CONSUMER_PROBE | |
486 | || link->status == DL_STATE_ACTIVE) { | |
487 | ret = true; | |
488 | break; | |
489 | } | |
490 | WRITE_ONCE(link->status, DL_STATE_SUPPLIER_UNBIND); | |
491 | } | |
492 | ||
493 | dev->links.status = DL_DEV_UNBINDING; | |
494 | ||
495 | device_links_write_unlock(); | |
496 | return ret; | |
497 | } | |
498 | ||
499 | /** | |
500 | * device_links_unbind_consumers - Force unbind consumers of the given device. | |
501 | * @dev: Device to unbind the consumers of. | |
502 | * | |
503 | * Walk the list of links to consumers for @dev and if any of them is in the | |
504 | * "consumer probe" state, wait for all device probes in progress to complete | |
505 | * and start over. | |
506 | * | |
507 | * If that's not the case, change the status of the link to "supplier unbind" | |
508 | * and check if the link was in the "active" state. If so, force the consumer | |
509 | * driver to unbind and start over (the consumer will not re-probe as we have | |
510 | * changed the state of the link already). | |
511 | * | |
512 | * Links with the DL_FLAG_STATELESS flag set are ignored. | |
513 | */ | |
514 | void device_links_unbind_consumers(struct device *dev) | |
515 | { | |
516 | struct device_link *link; | |
517 | ||
518 | start: | |
519 | device_links_write_lock(); | |
520 | ||
521 | list_for_each_entry(link, &dev->links.consumers, s_node) { | |
522 | enum device_link_state status; | |
523 | ||
524 | if (link->flags & DL_FLAG_STATELESS) | |
525 | continue; | |
526 | ||
527 | status = link->status; | |
528 | if (status == DL_STATE_CONSUMER_PROBE) { | |
529 | device_links_write_unlock(); | |
530 | ||
531 | wait_for_device_probe(); | |
532 | goto start; | |
533 | } | |
534 | WRITE_ONCE(link->status, DL_STATE_SUPPLIER_UNBIND); | |
535 | if (status == DL_STATE_ACTIVE) { | |
536 | struct device *consumer = link->consumer; | |
537 | ||
538 | get_device(consumer); | |
539 | ||
540 | device_links_write_unlock(); | |
541 | ||
542 | device_release_driver_internal(consumer, NULL, | |
543 | consumer->parent); | |
544 | put_device(consumer); | |
545 | goto start; | |
546 | } | |
547 | } | |
548 | ||
549 | device_links_write_unlock(); | |
550 | } | |
551 | ||
552 | /** | |
553 | * device_links_purge - Delete existing links to other devices. | |
554 | * @dev: Target device. | |
555 | */ | |
556 | static void device_links_purge(struct device *dev) | |
557 | { | |
558 | struct device_link *link, *ln; | |
559 | ||
560 | /* | |
561 | * Delete all of the remaining links from this device to any other | |
562 | * devices (either consumers or suppliers). | |
563 | */ | |
564 | device_links_write_lock(); | |
565 | ||
566 | list_for_each_entry_safe_reverse(link, ln, &dev->links.suppliers, c_node) { | |
567 | WARN_ON(link->status == DL_STATE_ACTIVE); | |
568 | __device_link_del(link); | |
569 | } | |
570 | ||
571 | list_for_each_entry_safe_reverse(link, ln, &dev->links.consumers, s_node) { | |
572 | WARN_ON(link->status != DL_STATE_DORMANT && | |
573 | link->status != DL_STATE_NONE); | |
574 | __device_link_del(link); | |
575 | } | |
576 | ||
577 | device_links_write_unlock(); | |
578 | } | |
579 | ||
580 | /* Device links support end. */ | |
581 | ||
4a3ad20c GKH |
582 | int (*platform_notify)(struct device *dev) = NULL; |
583 | int (*platform_notify_remove)(struct device *dev) = NULL; | |
e105b8bf DW |
584 | static struct kobject *dev_kobj; |
585 | struct kobject *sysfs_dev_char_kobj; | |
586 | struct kobject *sysfs_dev_block_kobj; | |
1da177e4 | 587 | |
5e33bc41 RW |
588 | static DEFINE_MUTEX(device_hotplug_lock); |
589 | ||
590 | void lock_device_hotplug(void) | |
591 | { | |
592 | mutex_lock(&device_hotplug_lock); | |
593 | } | |
594 | ||
595 | void unlock_device_hotplug(void) | |
596 | { | |
597 | mutex_unlock(&device_hotplug_lock); | |
598 | } | |
599 | ||
600 | int lock_device_hotplug_sysfs(void) | |
601 | { | |
602 | if (mutex_trylock(&device_hotplug_lock)) | |
603 | return 0; | |
604 | ||
605 | /* Avoid busy looping (5 ms of sleep should do). */ | |
606 | msleep(5); | |
607 | return restart_syscall(); | |
608 | } | |
609 | ||
4e886c29 GKH |
610 | #ifdef CONFIG_BLOCK |
611 | static inline int device_is_not_partition(struct device *dev) | |
612 | { | |
613 | return !(dev->type == &part_type); | |
614 | } | |
615 | #else | |
616 | static inline int device_is_not_partition(struct device *dev) | |
617 | { | |
618 | return 1; | |
619 | } | |
620 | #endif | |
1da177e4 | 621 | |
3e95637a AS |
622 | /** |
623 | * dev_driver_string - Return a device's driver name, if at all possible | |
624 | * @dev: struct device to get the name of | |
625 | * | |
626 | * Will return the device's driver's name if it is bound to a device. If | |
9169c012 | 627 | * the device is not bound to a driver, it will return the name of the bus |
3e95637a AS |
628 | * it is attached to. If it is not attached to a bus either, an empty |
629 | * string will be returned. | |
630 | */ | |
bf9ca69f | 631 | const char *dev_driver_string(const struct device *dev) |
3e95637a | 632 | { |
3589972e AS |
633 | struct device_driver *drv; |
634 | ||
635 | /* dev->driver can change to NULL underneath us because of unbinding, | |
636 | * so be careful about accessing it. dev->bus and dev->class should | |
637 | * never change once they are set, so they don't need special care. | |
638 | */ | |
639 | drv = ACCESS_ONCE(dev->driver); | |
640 | return drv ? drv->name : | |
a456b702 JD |
641 | (dev->bus ? dev->bus->name : |
642 | (dev->class ? dev->class->name : "")); | |
3e95637a | 643 | } |
310a922d | 644 | EXPORT_SYMBOL(dev_driver_string); |
3e95637a | 645 | |
1da177e4 LT |
646 | #define to_dev_attr(_attr) container_of(_attr, struct device_attribute, attr) |
647 | ||
4a3ad20c GKH |
648 | static ssize_t dev_attr_show(struct kobject *kobj, struct attribute *attr, |
649 | char *buf) | |
1da177e4 | 650 | { |
4a3ad20c | 651 | struct device_attribute *dev_attr = to_dev_attr(attr); |
b0d1f807 | 652 | struct device *dev = kobj_to_dev(kobj); |
4a0c20bf | 653 | ssize_t ret = -EIO; |
1da177e4 LT |
654 | |
655 | if (dev_attr->show) | |
54b6f35c | 656 | ret = dev_attr->show(dev, dev_attr, buf); |
815d2d50 | 657 | if (ret >= (ssize_t)PAGE_SIZE) { |
53a9c87e GKH |
658 | print_symbol("dev_attr_show: %s returned bad count\n", |
659 | (unsigned long)dev_attr->show); | |
815d2d50 | 660 | } |
1da177e4 LT |
661 | return ret; |
662 | } | |
663 | ||
4a3ad20c GKH |
664 | static ssize_t dev_attr_store(struct kobject *kobj, struct attribute *attr, |
665 | const char *buf, size_t count) | |
1da177e4 | 666 | { |
4a3ad20c | 667 | struct device_attribute *dev_attr = to_dev_attr(attr); |
b0d1f807 | 668 | struct device *dev = kobj_to_dev(kobj); |
4a0c20bf | 669 | ssize_t ret = -EIO; |
1da177e4 LT |
670 | |
671 | if (dev_attr->store) | |
54b6f35c | 672 | ret = dev_attr->store(dev, dev_attr, buf, count); |
1da177e4 LT |
673 | return ret; |
674 | } | |
675 | ||
52cf25d0 | 676 | static const struct sysfs_ops dev_sysfs_ops = { |
1da177e4 LT |
677 | .show = dev_attr_show, |
678 | .store = dev_attr_store, | |
679 | }; | |
680 | ||
ca22e56d KS |
681 | #define to_ext_attr(x) container_of(x, struct dev_ext_attribute, attr) |
682 | ||
683 | ssize_t device_store_ulong(struct device *dev, | |
684 | struct device_attribute *attr, | |
685 | const char *buf, size_t size) | |
686 | { | |
687 | struct dev_ext_attribute *ea = to_ext_attr(attr); | |
688 | char *end; | |
689 | unsigned long new = simple_strtoul(buf, &end, 0); | |
690 | if (end == buf) | |
691 | return -EINVAL; | |
692 | *(unsigned long *)(ea->var) = new; | |
693 | /* Always return full write size even if we didn't consume all */ | |
694 | return size; | |
695 | } | |
696 | EXPORT_SYMBOL_GPL(device_store_ulong); | |
697 | ||
698 | ssize_t device_show_ulong(struct device *dev, | |
699 | struct device_attribute *attr, | |
700 | char *buf) | |
701 | { | |
702 | struct dev_ext_attribute *ea = to_ext_attr(attr); | |
703 | return snprintf(buf, PAGE_SIZE, "%lx\n", *(unsigned long *)(ea->var)); | |
704 | } | |
705 | EXPORT_SYMBOL_GPL(device_show_ulong); | |
706 | ||
707 | ssize_t device_store_int(struct device *dev, | |
708 | struct device_attribute *attr, | |
709 | const char *buf, size_t size) | |
710 | { | |
711 | struct dev_ext_attribute *ea = to_ext_attr(attr); | |
712 | char *end; | |
713 | long new = simple_strtol(buf, &end, 0); | |
714 | if (end == buf || new > INT_MAX || new < INT_MIN) | |
715 | return -EINVAL; | |
716 | *(int *)(ea->var) = new; | |
717 | /* Always return full write size even if we didn't consume all */ | |
718 | return size; | |
719 | } | |
720 | EXPORT_SYMBOL_GPL(device_store_int); | |
721 | ||
722 | ssize_t device_show_int(struct device *dev, | |
723 | struct device_attribute *attr, | |
724 | char *buf) | |
725 | { | |
726 | struct dev_ext_attribute *ea = to_ext_attr(attr); | |
727 | ||
728 | return snprintf(buf, PAGE_SIZE, "%d\n", *(int *)(ea->var)); | |
729 | } | |
730 | EXPORT_SYMBOL_GPL(device_show_int); | |
1da177e4 | 731 | |
91872392 BP |
732 | ssize_t device_store_bool(struct device *dev, struct device_attribute *attr, |
733 | const char *buf, size_t size) | |
734 | { | |
735 | struct dev_ext_attribute *ea = to_ext_attr(attr); | |
736 | ||
737 | if (strtobool(buf, ea->var) < 0) | |
738 | return -EINVAL; | |
739 | ||
740 | return size; | |
741 | } | |
742 | EXPORT_SYMBOL_GPL(device_store_bool); | |
743 | ||
744 | ssize_t device_show_bool(struct device *dev, struct device_attribute *attr, | |
745 | char *buf) | |
746 | { | |
747 | struct dev_ext_attribute *ea = to_ext_attr(attr); | |
748 | ||
749 | return snprintf(buf, PAGE_SIZE, "%d\n", *(bool *)(ea->var)); | |
750 | } | |
751 | EXPORT_SYMBOL_GPL(device_show_bool); | |
752 | ||
1da177e4 | 753 | /** |
f8878dcb RD |
754 | * device_release - free device structure. |
755 | * @kobj: device's kobject. | |
1da177e4 | 756 | * |
f8878dcb RD |
757 | * This is called once the reference count for the object |
758 | * reaches 0. We forward the call to the device's release | |
759 | * method, which should handle actually freeing the structure. | |
1da177e4 | 760 | */ |
4a3ad20c | 761 | static void device_release(struct kobject *kobj) |
1da177e4 | 762 | { |
b0d1f807 | 763 | struct device *dev = kobj_to_dev(kobj); |
fb069a5d | 764 | struct device_private *p = dev->p; |
1da177e4 | 765 | |
a525a3dd ML |
766 | /* |
767 | * Some platform devices are driven without driver attached | |
768 | * and managed resources may have been acquired. Make sure | |
769 | * all resources are released. | |
770 | * | |
771 | * Drivers still can add resources into device after device | |
772 | * is deleted but alive, so release devres here to avoid | |
773 | * possible memory leak. | |
774 | */ | |
775 | devres_release_all(dev); | |
776 | ||
1da177e4 LT |
777 | if (dev->release) |
778 | dev->release(dev); | |
f9f852df KS |
779 | else if (dev->type && dev->type->release) |
780 | dev->type->release(dev); | |
2620efef GKH |
781 | else if (dev->class && dev->class->dev_release) |
782 | dev->class->dev_release(dev); | |
f810a5cf AV |
783 | else |
784 | WARN(1, KERN_ERR "Device '%s' does not have a release() " | |
4a3ad20c | 785 | "function, it is broken and must be fixed.\n", |
1e0b2cf9 | 786 | dev_name(dev)); |
fb069a5d | 787 | kfree(p); |
1da177e4 LT |
788 | } |
789 | ||
bc451f20 EB |
790 | static const void *device_namespace(struct kobject *kobj) |
791 | { | |
b0d1f807 | 792 | struct device *dev = kobj_to_dev(kobj); |
bc451f20 EB |
793 | const void *ns = NULL; |
794 | ||
795 | if (dev->class && dev->class->ns_type) | |
796 | ns = dev->class->namespace(dev); | |
797 | ||
798 | return ns; | |
799 | } | |
800 | ||
8f4afc41 | 801 | static struct kobj_type device_ktype = { |
1da177e4 LT |
802 | .release = device_release, |
803 | .sysfs_ops = &dev_sysfs_ops, | |
bc451f20 | 804 | .namespace = device_namespace, |
1da177e4 LT |
805 | }; |
806 | ||
807 | ||
312c004d | 808 | static int dev_uevent_filter(struct kset *kset, struct kobject *kobj) |
1da177e4 LT |
809 | { |
810 | struct kobj_type *ktype = get_ktype(kobj); | |
811 | ||
8f4afc41 | 812 | if (ktype == &device_ktype) { |
b0d1f807 | 813 | struct device *dev = kobj_to_dev(kobj); |
1da177e4 LT |
814 | if (dev->bus) |
815 | return 1; | |
23681e47 GKH |
816 | if (dev->class) |
817 | return 1; | |
1da177e4 LT |
818 | } |
819 | return 0; | |
820 | } | |
821 | ||
312c004d | 822 | static const char *dev_uevent_name(struct kset *kset, struct kobject *kobj) |
1da177e4 | 823 | { |
b0d1f807 | 824 | struct device *dev = kobj_to_dev(kobj); |
1da177e4 | 825 | |
23681e47 GKH |
826 | if (dev->bus) |
827 | return dev->bus->name; | |
828 | if (dev->class) | |
829 | return dev->class->name; | |
830 | return NULL; | |
1da177e4 LT |
831 | } |
832 | ||
7eff2e7a KS |
833 | static int dev_uevent(struct kset *kset, struct kobject *kobj, |
834 | struct kobj_uevent_env *env) | |
1da177e4 | 835 | { |
b0d1f807 | 836 | struct device *dev = kobj_to_dev(kobj); |
1da177e4 LT |
837 | int retval = 0; |
838 | ||
6fcf53ac | 839 | /* add device node properties if present */ |
23681e47 | 840 | if (MAJOR(dev->devt)) { |
6fcf53ac KS |
841 | const char *tmp; |
842 | const char *name; | |
2c9ede55 | 843 | umode_t mode = 0; |
4e4098a3 GKH |
844 | kuid_t uid = GLOBAL_ROOT_UID; |
845 | kgid_t gid = GLOBAL_ROOT_GID; | |
6fcf53ac | 846 | |
7eff2e7a KS |
847 | add_uevent_var(env, "MAJOR=%u", MAJOR(dev->devt)); |
848 | add_uevent_var(env, "MINOR=%u", MINOR(dev->devt)); | |
3c2670e6 | 849 | name = device_get_devnode(dev, &mode, &uid, &gid, &tmp); |
6fcf53ac KS |
850 | if (name) { |
851 | add_uevent_var(env, "DEVNAME=%s", name); | |
e454cea2 KS |
852 | if (mode) |
853 | add_uevent_var(env, "DEVMODE=%#o", mode & 0777); | |
4e4098a3 GKH |
854 | if (!uid_eq(uid, GLOBAL_ROOT_UID)) |
855 | add_uevent_var(env, "DEVUID=%u", from_kuid(&init_user_ns, uid)); | |
856 | if (!gid_eq(gid, GLOBAL_ROOT_GID)) | |
857 | add_uevent_var(env, "DEVGID=%u", from_kgid(&init_user_ns, gid)); | |
3c2670e6 | 858 | kfree(tmp); |
6fcf53ac | 859 | } |
23681e47 GKH |
860 | } |
861 | ||
414264f9 | 862 | if (dev->type && dev->type->name) |
7eff2e7a | 863 | add_uevent_var(env, "DEVTYPE=%s", dev->type->name); |
414264f9 | 864 | |
239378f1 | 865 | if (dev->driver) |
7eff2e7a | 866 | add_uevent_var(env, "DRIVER=%s", dev->driver->name); |
239378f1 | 867 | |
07d57a32 GL |
868 | /* Add common DT information about the device */ |
869 | of_device_uevent(dev, env); | |
870 | ||
7eff2e7a | 871 | /* have the bus specific function add its stuff */ |
312c004d | 872 | if (dev->bus && dev->bus->uevent) { |
7eff2e7a | 873 | retval = dev->bus->uevent(dev, env); |
f9f852df | 874 | if (retval) |
7dc72b28 | 875 | pr_debug("device: '%s': %s: bus uevent() returned %d\n", |
1e0b2cf9 | 876 | dev_name(dev), __func__, retval); |
1da177e4 LT |
877 | } |
878 | ||
7eff2e7a | 879 | /* have the class specific function add its stuff */ |
2620efef | 880 | if (dev->class && dev->class->dev_uevent) { |
7eff2e7a | 881 | retval = dev->class->dev_uevent(dev, env); |
f9f852df | 882 | if (retval) |
7dc72b28 | 883 | pr_debug("device: '%s': %s: class uevent() " |
1e0b2cf9 | 884 | "returned %d\n", dev_name(dev), |
2b3a302a | 885 | __func__, retval); |
f9f852df KS |
886 | } |
887 | ||
eef35c2d | 888 | /* have the device type specific function add its stuff */ |
f9f852df | 889 | if (dev->type && dev->type->uevent) { |
7eff2e7a | 890 | retval = dev->type->uevent(dev, env); |
f9f852df | 891 | if (retval) |
7dc72b28 | 892 | pr_debug("device: '%s': %s: dev_type uevent() " |
1e0b2cf9 | 893 | "returned %d\n", dev_name(dev), |
2b3a302a | 894 | __func__, retval); |
2620efef GKH |
895 | } |
896 | ||
1da177e4 LT |
897 | return retval; |
898 | } | |
899 | ||
9cd43611 | 900 | static const struct kset_uevent_ops device_uevent_ops = { |
312c004d KS |
901 | .filter = dev_uevent_filter, |
902 | .name = dev_uevent_name, | |
903 | .uevent = dev_uevent, | |
1da177e4 LT |
904 | }; |
905 | ||
c5e064a6 | 906 | static ssize_t uevent_show(struct device *dev, struct device_attribute *attr, |
16574dcc KS |
907 | char *buf) |
908 | { | |
909 | struct kobject *top_kobj; | |
910 | struct kset *kset; | |
7eff2e7a | 911 | struct kobj_uevent_env *env = NULL; |
16574dcc KS |
912 | int i; |
913 | size_t count = 0; | |
914 | int retval; | |
915 | ||
916 | /* search the kset, the device belongs to */ | |
917 | top_kobj = &dev->kobj; | |
5c5daf65 KS |
918 | while (!top_kobj->kset && top_kobj->parent) |
919 | top_kobj = top_kobj->parent; | |
16574dcc KS |
920 | if (!top_kobj->kset) |
921 | goto out; | |
5c5daf65 | 922 | |
16574dcc KS |
923 | kset = top_kobj->kset; |
924 | if (!kset->uevent_ops || !kset->uevent_ops->uevent) | |
925 | goto out; | |
926 | ||
927 | /* respect filter */ | |
928 | if (kset->uevent_ops && kset->uevent_ops->filter) | |
929 | if (!kset->uevent_ops->filter(kset, &dev->kobj)) | |
930 | goto out; | |
931 | ||
7eff2e7a KS |
932 | env = kzalloc(sizeof(struct kobj_uevent_env), GFP_KERNEL); |
933 | if (!env) | |
c7308c81 GKH |
934 | return -ENOMEM; |
935 | ||
16574dcc | 936 | /* let the kset specific function add its keys */ |
7eff2e7a | 937 | retval = kset->uevent_ops->uevent(kset, &dev->kobj, env); |
16574dcc KS |
938 | if (retval) |
939 | goto out; | |
940 | ||
941 | /* copy keys to file */ | |
7eff2e7a KS |
942 | for (i = 0; i < env->envp_idx; i++) |
943 | count += sprintf(&buf[count], "%s\n", env->envp[i]); | |
16574dcc | 944 | out: |
7eff2e7a | 945 | kfree(env); |
16574dcc KS |
946 | return count; |
947 | } | |
948 | ||
c5e064a6 | 949 | static ssize_t uevent_store(struct device *dev, struct device_attribute *attr, |
a7fd6706 KS |
950 | const char *buf, size_t count) |
951 | { | |
60a96a59 KS |
952 | enum kobject_action action; |
953 | ||
3f5468c9 | 954 | if (kobject_action_type(buf, count, &action) == 0) |
60a96a59 | 955 | kobject_uevent(&dev->kobj, action); |
3f5468c9 KS |
956 | else |
957 | dev_err(dev, "uevent: unknown action-string\n"); | |
a7fd6706 KS |
958 | return count; |
959 | } | |
c5e064a6 | 960 | static DEVICE_ATTR_RW(uevent); |
a7fd6706 | 961 | |
c5e064a6 | 962 | static ssize_t online_show(struct device *dev, struct device_attribute *attr, |
4f3549d7 RW |
963 | char *buf) |
964 | { | |
965 | bool val; | |
966 | ||
5e33bc41 | 967 | device_lock(dev); |
4f3549d7 | 968 | val = !dev->offline; |
5e33bc41 | 969 | device_unlock(dev); |
4f3549d7 RW |
970 | return sprintf(buf, "%u\n", val); |
971 | } | |
972 | ||
c5e064a6 | 973 | static ssize_t online_store(struct device *dev, struct device_attribute *attr, |
4f3549d7 RW |
974 | const char *buf, size_t count) |
975 | { | |
976 | bool val; | |
977 | int ret; | |
978 | ||
979 | ret = strtobool(buf, &val); | |
980 | if (ret < 0) | |
981 | return ret; | |
982 | ||
5e33bc41 RW |
983 | ret = lock_device_hotplug_sysfs(); |
984 | if (ret) | |
985 | return ret; | |
986 | ||
4f3549d7 RW |
987 | ret = val ? device_online(dev) : device_offline(dev); |
988 | unlock_device_hotplug(); | |
989 | return ret < 0 ? ret : count; | |
990 | } | |
c5e064a6 | 991 | static DEVICE_ATTR_RW(online); |
4f3549d7 | 992 | |
fa6fdb33 | 993 | int device_add_groups(struct device *dev, const struct attribute_group **groups) |
621a1672 | 994 | { |
3e9b2bae | 995 | return sysfs_create_groups(&dev->kobj, groups); |
de0ff00d GKH |
996 | } |
997 | ||
fa6fdb33 GKH |
998 | void device_remove_groups(struct device *dev, |
999 | const struct attribute_group **groups) | |
de0ff00d | 1000 | { |
3e9b2bae | 1001 | sysfs_remove_groups(&dev->kobj, groups); |
de0ff00d GKH |
1002 | } |
1003 | ||
2620efef GKH |
1004 | static int device_add_attrs(struct device *dev) |
1005 | { | |
1006 | struct class *class = dev->class; | |
aed65af1 | 1007 | const struct device_type *type = dev->type; |
621a1672 | 1008 | int error; |
2620efef | 1009 | |
621a1672 | 1010 | if (class) { |
d05a6f96 | 1011 | error = device_add_groups(dev, class->dev_groups); |
f9f852df | 1012 | if (error) |
621a1672 | 1013 | return error; |
2620efef | 1014 | } |
f9f852df | 1015 | |
621a1672 DT |
1016 | if (type) { |
1017 | error = device_add_groups(dev, type->groups); | |
f9f852df | 1018 | if (error) |
a6b01ded | 1019 | goto err_remove_class_groups; |
f9f852df KS |
1020 | } |
1021 | ||
621a1672 DT |
1022 | error = device_add_groups(dev, dev->groups); |
1023 | if (error) | |
1024 | goto err_remove_type_groups; | |
1025 | ||
4f3549d7 | 1026 | if (device_supports_offline(dev) && !dev->offline_disabled) { |
c5e064a6 | 1027 | error = device_create_file(dev, &dev_attr_online); |
4f3549d7 | 1028 | if (error) |
ecfbf6fd | 1029 | goto err_remove_dev_groups; |
4f3549d7 RW |
1030 | } |
1031 | ||
621a1672 DT |
1032 | return 0; |
1033 | ||
ecfbf6fd RW |
1034 | err_remove_dev_groups: |
1035 | device_remove_groups(dev, dev->groups); | |
621a1672 DT |
1036 | err_remove_type_groups: |
1037 | if (type) | |
1038 | device_remove_groups(dev, type->groups); | |
d05a6f96 GKH |
1039 | err_remove_class_groups: |
1040 | if (class) | |
1041 | device_remove_groups(dev, class->dev_groups); | |
621a1672 | 1042 | |
2620efef GKH |
1043 | return error; |
1044 | } | |
1045 | ||
1046 | static void device_remove_attrs(struct device *dev) | |
1047 | { | |
1048 | struct class *class = dev->class; | |
aed65af1 | 1049 | const struct device_type *type = dev->type; |
2620efef | 1050 | |
c5e064a6 | 1051 | device_remove_file(dev, &dev_attr_online); |
621a1672 | 1052 | device_remove_groups(dev, dev->groups); |
f9f852df | 1053 | |
621a1672 DT |
1054 | if (type) |
1055 | device_remove_groups(dev, type->groups); | |
1056 | ||
a6b01ded | 1057 | if (class) |
d05a6f96 | 1058 | device_remove_groups(dev, class->dev_groups); |
2620efef GKH |
1059 | } |
1060 | ||
c5e064a6 | 1061 | static ssize_t dev_show(struct device *dev, struct device_attribute *attr, |
23681e47 GKH |
1062 | char *buf) |
1063 | { | |
1064 | return print_dev_t(buf, dev->devt); | |
1065 | } | |
c5e064a6 | 1066 | static DEVICE_ATTR_RO(dev); |
ad6a1e1c | 1067 | |
ca22e56d | 1068 | /* /sys/devices/ */ |
881c6cfd | 1069 | struct kset *devices_kset; |
1da177e4 | 1070 | |
52cdbdd4 GS |
1071 | /** |
1072 | * devices_kset_move_before - Move device in the devices_kset's list. | |
1073 | * @deva: Device to move. | |
1074 | * @devb: Device @deva should come before. | |
1075 | */ | |
1076 | static void devices_kset_move_before(struct device *deva, struct device *devb) | |
1077 | { | |
1078 | if (!devices_kset) | |
1079 | return; | |
1080 | pr_debug("devices_kset: Moving %s before %s\n", | |
1081 | dev_name(deva), dev_name(devb)); | |
1082 | spin_lock(&devices_kset->list_lock); | |
1083 | list_move_tail(&deva->kobj.entry, &devb->kobj.entry); | |
1084 | spin_unlock(&devices_kset->list_lock); | |
1085 | } | |
1086 | ||
1087 | /** | |
1088 | * devices_kset_move_after - Move device in the devices_kset's list. | |
1089 | * @deva: Device to move | |
1090 | * @devb: Device @deva should come after. | |
1091 | */ | |
1092 | static void devices_kset_move_after(struct device *deva, struct device *devb) | |
1093 | { | |
1094 | if (!devices_kset) | |
1095 | return; | |
1096 | pr_debug("devices_kset: Moving %s after %s\n", | |
1097 | dev_name(deva), dev_name(devb)); | |
1098 | spin_lock(&devices_kset->list_lock); | |
1099 | list_move(&deva->kobj.entry, &devb->kobj.entry); | |
1100 | spin_unlock(&devices_kset->list_lock); | |
1101 | } | |
1102 | ||
1103 | /** | |
1104 | * devices_kset_move_last - move the device to the end of devices_kset's list. | |
1105 | * @dev: device to move | |
1106 | */ | |
1107 | void devices_kset_move_last(struct device *dev) | |
1108 | { | |
1109 | if (!devices_kset) | |
1110 | return; | |
1111 | pr_debug("devices_kset: Moving %s to end of list\n", dev_name(dev)); | |
1112 | spin_lock(&devices_kset->list_lock); | |
1113 | list_move_tail(&dev->kobj.entry, &devices_kset->list); | |
1114 | spin_unlock(&devices_kset->list_lock); | |
1115 | } | |
1116 | ||
1da177e4 | 1117 | /** |
4a3ad20c GKH |
1118 | * device_create_file - create sysfs attribute file for device. |
1119 | * @dev: device. | |
1120 | * @attr: device attribute descriptor. | |
1da177e4 | 1121 | */ |
26579ab7 PC |
1122 | int device_create_file(struct device *dev, |
1123 | const struct device_attribute *attr) | |
1da177e4 LT |
1124 | { |
1125 | int error = 0; | |
8f46baaa FB |
1126 | |
1127 | if (dev) { | |
1128 | WARN(((attr->attr.mode & S_IWUGO) && !attr->store), | |
97521978 | 1129 | "Attribute %s: write permission without 'store'\n", |
1130 | attr->attr.name); | |
8f46baaa | 1131 | WARN(((attr->attr.mode & S_IRUGO) && !attr->show), |
97521978 | 1132 | "Attribute %s: read permission without 'show'\n", |
1133 | attr->attr.name); | |
1da177e4 | 1134 | error = sysfs_create_file(&dev->kobj, &attr->attr); |
8f46baaa FB |
1135 | } |
1136 | ||
1da177e4 LT |
1137 | return error; |
1138 | } | |
86df2687 | 1139 | EXPORT_SYMBOL_GPL(device_create_file); |
1da177e4 LT |
1140 | |
1141 | /** | |
4a3ad20c GKH |
1142 | * device_remove_file - remove sysfs attribute file. |
1143 | * @dev: device. | |
1144 | * @attr: device attribute descriptor. | |
1da177e4 | 1145 | */ |
26579ab7 PC |
1146 | void device_remove_file(struct device *dev, |
1147 | const struct device_attribute *attr) | |
1da177e4 | 1148 | { |
0c98b19f | 1149 | if (dev) |
1da177e4 | 1150 | sysfs_remove_file(&dev->kobj, &attr->attr); |
1da177e4 | 1151 | } |
86df2687 | 1152 | EXPORT_SYMBOL_GPL(device_remove_file); |
1da177e4 | 1153 | |
6b0afc2a TH |
1154 | /** |
1155 | * device_remove_file_self - remove sysfs attribute file from its own method. | |
1156 | * @dev: device. | |
1157 | * @attr: device attribute descriptor. | |
1158 | * | |
1159 | * See kernfs_remove_self() for details. | |
1160 | */ | |
1161 | bool device_remove_file_self(struct device *dev, | |
1162 | const struct device_attribute *attr) | |
1163 | { | |
1164 | if (dev) | |
1165 | return sysfs_remove_file_self(&dev->kobj, &attr->attr); | |
1166 | else | |
1167 | return false; | |
1168 | } | |
1169 | EXPORT_SYMBOL_GPL(device_remove_file_self); | |
1170 | ||
2589f188 GKH |
1171 | /** |
1172 | * device_create_bin_file - create sysfs binary attribute file for device. | |
1173 | * @dev: device. | |
1174 | * @attr: device binary attribute descriptor. | |
1175 | */ | |
66ecb92b PC |
1176 | int device_create_bin_file(struct device *dev, |
1177 | const struct bin_attribute *attr) | |
2589f188 GKH |
1178 | { |
1179 | int error = -EINVAL; | |
1180 | if (dev) | |
1181 | error = sysfs_create_bin_file(&dev->kobj, attr); | |
1182 | return error; | |
1183 | } | |
1184 | EXPORT_SYMBOL_GPL(device_create_bin_file); | |
1185 | ||
1186 | /** | |
1187 | * device_remove_bin_file - remove sysfs binary attribute file | |
1188 | * @dev: device. | |
1189 | * @attr: device binary attribute descriptor. | |
1190 | */ | |
66ecb92b PC |
1191 | void device_remove_bin_file(struct device *dev, |
1192 | const struct bin_attribute *attr) | |
2589f188 GKH |
1193 | { |
1194 | if (dev) | |
1195 | sysfs_remove_bin_file(&dev->kobj, attr); | |
1196 | } | |
1197 | EXPORT_SYMBOL_GPL(device_remove_bin_file); | |
1198 | ||
34bb61f9 JB |
1199 | static void klist_children_get(struct klist_node *n) |
1200 | { | |
f791b8c8 GKH |
1201 | struct device_private *p = to_device_private_parent(n); |
1202 | struct device *dev = p->device; | |
34bb61f9 JB |
1203 | |
1204 | get_device(dev); | |
1205 | } | |
1206 | ||
1207 | static void klist_children_put(struct klist_node *n) | |
1208 | { | |
f791b8c8 GKH |
1209 | struct device_private *p = to_device_private_parent(n); |
1210 | struct device *dev = p->device; | |
34bb61f9 JB |
1211 | |
1212 | put_device(dev); | |
1213 | } | |
1214 | ||
1da177e4 | 1215 | /** |
4a3ad20c GKH |
1216 | * device_initialize - init device structure. |
1217 | * @dev: device. | |
1da177e4 | 1218 | * |
5739411a CH |
1219 | * This prepares the device for use by other layers by initializing |
1220 | * its fields. | |
4a3ad20c | 1221 | * It is the first half of device_register(), if called by |
5739411a CH |
1222 | * that function, though it can also be called separately, so one |
1223 | * may use @dev's fields. In particular, get_device()/put_device() | |
1224 | * may be used for reference counting of @dev after calling this | |
1225 | * function. | |
1226 | * | |
b10d5efd AS |
1227 | * All fields in @dev must be initialized by the caller to 0, except |
1228 | * for those explicitly set to some other value. The simplest | |
1229 | * approach is to use kzalloc() to allocate the structure containing | |
1230 | * @dev. | |
1231 | * | |
5739411a CH |
1232 | * NOTE: Use put_device() to give up your reference instead of freeing |
1233 | * @dev directly once you have called this function. | |
1da177e4 | 1234 | */ |
1da177e4 LT |
1235 | void device_initialize(struct device *dev) |
1236 | { | |
881c6cfd | 1237 | dev->kobj.kset = devices_kset; |
f9cb074b | 1238 | kobject_init(&dev->kobj, &device_ktype); |
1da177e4 | 1239 | INIT_LIST_HEAD(&dev->dma_pools); |
3142788b | 1240 | mutex_init(&dev->mutex); |
1704f47b | 1241 | lockdep_set_novalidate_class(&dev->mutex); |
9ac7849e TH |
1242 | spin_lock_init(&dev->devres_lock); |
1243 | INIT_LIST_HEAD(&dev->devres_head); | |
3b98aeaf | 1244 | device_pm_init(dev); |
87348136 | 1245 | set_dev_node(dev, -1); |
4a7cc831 JL |
1246 | #ifdef CONFIG_GENERIC_MSI_IRQ |
1247 | INIT_LIST_HEAD(&dev->msi_list); | |
1248 | #endif | |
9ed98953 RW |
1249 | INIT_LIST_HEAD(&dev->links.consumers); |
1250 | INIT_LIST_HEAD(&dev->links.suppliers); | |
1251 | dev->links.status = DL_DEV_NO_DRIVER; | |
1da177e4 | 1252 | } |
86df2687 | 1253 | EXPORT_SYMBOL_GPL(device_initialize); |
1da177e4 | 1254 | |
d73ce004 | 1255 | struct kobject *virtual_device_parent(struct device *dev) |
f0ee61a6 | 1256 | { |
86406245 | 1257 | static struct kobject *virtual_dir = NULL; |
f0ee61a6 | 1258 | |
86406245 | 1259 | if (!virtual_dir) |
4ff6abff | 1260 | virtual_dir = kobject_create_and_add("virtual", |
881c6cfd | 1261 | &devices_kset->kobj); |
f0ee61a6 | 1262 | |
86406245 | 1263 | return virtual_dir; |
f0ee61a6 GKH |
1264 | } |
1265 | ||
bc451f20 EB |
1266 | struct class_dir { |
1267 | struct kobject kobj; | |
1268 | struct class *class; | |
1269 | }; | |
1270 | ||
1271 | #define to_class_dir(obj) container_of(obj, struct class_dir, kobj) | |
1272 | ||
1273 | static void class_dir_release(struct kobject *kobj) | |
1274 | { | |
1275 | struct class_dir *dir = to_class_dir(kobj); | |
1276 | kfree(dir); | |
1277 | } | |
1278 | ||
1279 | static const | |
1280 | struct kobj_ns_type_operations *class_dir_child_ns_type(struct kobject *kobj) | |
40fa5422 | 1281 | { |
bc451f20 EB |
1282 | struct class_dir *dir = to_class_dir(kobj); |
1283 | return dir->class->ns_type; | |
1284 | } | |
1285 | ||
1286 | static struct kobj_type class_dir_ktype = { | |
1287 | .release = class_dir_release, | |
1288 | .sysfs_ops = &kobj_sysfs_ops, | |
1289 | .child_ns_type = class_dir_child_ns_type | |
1290 | }; | |
1291 | ||
1292 | static struct kobject * | |
1293 | class_dir_create_and_add(struct class *class, struct kobject *parent_kobj) | |
1294 | { | |
1295 | struct class_dir *dir; | |
43968d2f GKH |
1296 | int retval; |
1297 | ||
bc451f20 EB |
1298 | dir = kzalloc(sizeof(*dir), GFP_KERNEL); |
1299 | if (!dir) | |
1300 | return NULL; | |
1301 | ||
1302 | dir->class = class; | |
1303 | kobject_init(&dir->kobj, &class_dir_ktype); | |
1304 | ||
6b6e39a6 | 1305 | dir->kobj.kset = &class->p->glue_dirs; |
bc451f20 EB |
1306 | |
1307 | retval = kobject_add(&dir->kobj, parent_kobj, "%s", class->name); | |
1308 | if (retval < 0) { | |
1309 | kobject_put(&dir->kobj); | |
1310 | return NULL; | |
1311 | } | |
1312 | return &dir->kobj; | |
1313 | } | |
1314 | ||
e4a60d13 | 1315 | static DEFINE_MUTEX(gdp_mutex); |
bc451f20 EB |
1316 | |
1317 | static struct kobject *get_device_parent(struct device *dev, | |
1318 | struct device *parent) | |
1319 | { | |
86406245 KS |
1320 | if (dev->class) { |
1321 | struct kobject *kobj = NULL; | |
1322 | struct kobject *parent_kobj; | |
1323 | struct kobject *k; | |
1324 | ||
ead454fe | 1325 | #ifdef CONFIG_BLOCK |
39aba963 | 1326 | /* block disks show up in /sys/block */ |
e52eec13 | 1327 | if (sysfs_deprecated && dev->class == &block_class) { |
39aba963 KS |
1328 | if (parent && parent->class == &block_class) |
1329 | return &parent->kobj; | |
6b6e39a6 | 1330 | return &block_class.p->subsys.kobj; |
39aba963 | 1331 | } |
ead454fe | 1332 | #endif |
e52eec13 | 1333 | |
86406245 KS |
1334 | /* |
1335 | * If we have no parent, we live in "virtual". | |
0f4dafc0 KS |
1336 | * Class-devices with a non class-device as parent, live |
1337 | * in a "glue" directory to prevent namespace collisions. | |
86406245 KS |
1338 | */ |
1339 | if (parent == NULL) | |
1340 | parent_kobj = virtual_device_parent(dev); | |
24b1442d | 1341 | else if (parent->class && !dev->class->ns_type) |
86406245 KS |
1342 | return &parent->kobj; |
1343 | else | |
1344 | parent_kobj = &parent->kobj; | |
1345 | ||
77d3d7c1 TH |
1346 | mutex_lock(&gdp_mutex); |
1347 | ||
86406245 | 1348 | /* find our class-directory at the parent and reference it */ |
6b6e39a6 KS |
1349 | spin_lock(&dev->class->p->glue_dirs.list_lock); |
1350 | list_for_each_entry(k, &dev->class->p->glue_dirs.list, entry) | |
86406245 KS |
1351 | if (k->parent == parent_kobj) { |
1352 | kobj = kobject_get(k); | |
1353 | break; | |
1354 | } | |
6b6e39a6 | 1355 | spin_unlock(&dev->class->p->glue_dirs.list_lock); |
77d3d7c1 TH |
1356 | if (kobj) { |
1357 | mutex_unlock(&gdp_mutex); | |
86406245 | 1358 | return kobj; |
77d3d7c1 | 1359 | } |
86406245 KS |
1360 | |
1361 | /* or create a new class-directory at the parent device */ | |
bc451f20 | 1362 | k = class_dir_create_and_add(dev->class, parent_kobj); |
0f4dafc0 | 1363 | /* do not emit an uevent for this simple "glue" directory */ |
77d3d7c1 | 1364 | mutex_unlock(&gdp_mutex); |
43968d2f | 1365 | return k; |
86406245 KS |
1366 | } |
1367 | ||
ca22e56d KS |
1368 | /* subsystems can specify a default root directory for their devices */ |
1369 | if (!parent && dev->bus && dev->bus->dev_root) | |
1370 | return &dev->bus->dev_root->kobj; | |
1371 | ||
86406245 | 1372 | if (parent) |
c744aeae CH |
1373 | return &parent->kobj; |
1374 | return NULL; | |
1375 | } | |
da231fd5 | 1376 | |
cebf8fd1 ML |
1377 | static inline bool live_in_glue_dir(struct kobject *kobj, |
1378 | struct device *dev) | |
1379 | { | |
1380 | if (!kobj || !dev->class || | |
1381 | kobj->kset != &dev->class->p->glue_dirs) | |
1382 | return false; | |
1383 | return true; | |
1384 | } | |
1385 | ||
1386 | static inline struct kobject *get_glue_dir(struct device *dev) | |
1387 | { | |
1388 | return dev->kobj.parent; | |
1389 | } | |
1390 | ||
1391 | /* | |
1392 | * make sure cleaning up dir as the last step, we need to make | |
1393 | * sure .release handler of kobject is run with holding the | |
1394 | * global lock | |
1395 | */ | |
63b6971a | 1396 | static void cleanup_glue_dir(struct device *dev, struct kobject *glue_dir) |
da231fd5 | 1397 | { |
0f4dafc0 | 1398 | /* see if we live in a "glue" directory */ |
cebf8fd1 | 1399 | if (!live_in_glue_dir(glue_dir, dev)) |
da231fd5 KS |
1400 | return; |
1401 | ||
e4a60d13 | 1402 | mutex_lock(&gdp_mutex); |
0f4dafc0 | 1403 | kobject_put(glue_dir); |
e4a60d13 | 1404 | mutex_unlock(&gdp_mutex); |
da231fd5 | 1405 | } |
63b6971a | 1406 | |
2ee97caf CH |
1407 | static int device_add_class_symlinks(struct device *dev) |
1408 | { | |
5590f319 | 1409 | struct device_node *of_node = dev_of_node(dev); |
2ee97caf CH |
1410 | int error; |
1411 | ||
5590f319 BH |
1412 | if (of_node) { |
1413 | error = sysfs_create_link(&dev->kobj, &of_node->kobj,"of_node"); | |
1414 | if (error) | |
1415 | dev_warn(dev, "Error %d creating of_node link\n",error); | |
1416 | /* An error here doesn't warrant bringing down the device */ | |
1417 | } | |
1418 | ||
2ee97caf CH |
1419 | if (!dev->class) |
1420 | return 0; | |
da231fd5 | 1421 | |
1fbfee6c | 1422 | error = sysfs_create_link(&dev->kobj, |
6b6e39a6 | 1423 | &dev->class->p->subsys.kobj, |
2ee97caf CH |
1424 | "subsystem"); |
1425 | if (error) | |
5590f319 | 1426 | goto out_devnode; |
da231fd5 | 1427 | |
4e886c29 | 1428 | if (dev->parent && device_is_not_partition(dev)) { |
39aba963 | 1429 | error = sysfs_create_link(&dev->kobj, &dev->parent->kobj, |
4f01a757 DT |
1430 | "device"); |
1431 | if (error) | |
39aba963 | 1432 | goto out_subsys; |
2ee97caf | 1433 | } |
2ee97caf | 1434 | |
ead454fe | 1435 | #ifdef CONFIG_BLOCK |
39aba963 | 1436 | /* /sys/block has directories and does not need symlinks */ |
e52eec13 | 1437 | if (sysfs_deprecated && dev->class == &block_class) |
39aba963 | 1438 | return 0; |
ead454fe | 1439 | #endif |
39aba963 | 1440 | |
da231fd5 | 1441 | /* link in the class directory pointing to the device */ |
6b6e39a6 | 1442 | error = sysfs_create_link(&dev->class->p->subsys.kobj, |
1e0b2cf9 | 1443 | &dev->kobj, dev_name(dev)); |
da231fd5 | 1444 | if (error) |
39aba963 | 1445 | goto out_device; |
da231fd5 | 1446 | |
da231fd5 KS |
1447 | return 0; |
1448 | ||
39aba963 KS |
1449 | out_device: |
1450 | sysfs_remove_link(&dev->kobj, "device"); | |
da231fd5 | 1451 | |
2ee97caf CH |
1452 | out_subsys: |
1453 | sysfs_remove_link(&dev->kobj, "subsystem"); | |
5590f319 BH |
1454 | out_devnode: |
1455 | sysfs_remove_link(&dev->kobj, "of_node"); | |
2ee97caf CH |
1456 | return error; |
1457 | } | |
1458 | ||
1459 | static void device_remove_class_symlinks(struct device *dev) | |
1460 | { | |
5590f319 BH |
1461 | if (dev_of_node(dev)) |
1462 | sysfs_remove_link(&dev->kobj, "of_node"); | |
1463 | ||
2ee97caf CH |
1464 | if (!dev->class) |
1465 | return; | |
da231fd5 | 1466 | |
4e886c29 | 1467 | if (dev->parent && device_is_not_partition(dev)) |
da231fd5 | 1468 | sysfs_remove_link(&dev->kobj, "device"); |
2ee97caf | 1469 | sysfs_remove_link(&dev->kobj, "subsystem"); |
ead454fe | 1470 | #ifdef CONFIG_BLOCK |
e52eec13 | 1471 | if (sysfs_deprecated && dev->class == &block_class) |
39aba963 | 1472 | return; |
ead454fe | 1473 | #endif |
6b6e39a6 | 1474 | sysfs_delete_link(&dev->class->p->subsys.kobj, &dev->kobj, dev_name(dev)); |
2ee97caf CH |
1475 | } |
1476 | ||
413c239f SR |
1477 | /** |
1478 | * dev_set_name - set a device name | |
1479 | * @dev: device | |
46232366 | 1480 | * @fmt: format string for the device's name |
413c239f SR |
1481 | */ |
1482 | int dev_set_name(struct device *dev, const char *fmt, ...) | |
1483 | { | |
1484 | va_list vargs; | |
1fa5ae85 | 1485 | int err; |
413c239f SR |
1486 | |
1487 | va_start(vargs, fmt); | |
1fa5ae85 | 1488 | err = kobject_set_name_vargs(&dev->kobj, fmt, vargs); |
413c239f | 1489 | va_end(vargs); |
1fa5ae85 | 1490 | return err; |
413c239f SR |
1491 | } |
1492 | EXPORT_SYMBOL_GPL(dev_set_name); | |
1493 | ||
e105b8bf DW |
1494 | /** |
1495 | * device_to_dev_kobj - select a /sys/dev/ directory for the device | |
1496 | * @dev: device | |
1497 | * | |
1498 | * By default we select char/ for new entries. Setting class->dev_obj | |
1499 | * to NULL prevents an entry from being created. class->dev_kobj must | |
1500 | * be set (or cleared) before any devices are registered to the class | |
1501 | * otherwise device_create_sys_dev_entry() and | |
0d4e293c PK |
1502 | * device_remove_sys_dev_entry() will disagree about the presence of |
1503 | * the link. | |
e105b8bf DW |
1504 | */ |
1505 | static struct kobject *device_to_dev_kobj(struct device *dev) | |
1506 | { | |
1507 | struct kobject *kobj; | |
1508 | ||
1509 | if (dev->class) | |
1510 | kobj = dev->class->dev_kobj; | |
1511 | else | |
1512 | kobj = sysfs_dev_char_kobj; | |
1513 | ||
1514 | return kobj; | |
1515 | } | |
1516 | ||
1517 | static int device_create_sys_dev_entry(struct device *dev) | |
1518 | { | |
1519 | struct kobject *kobj = device_to_dev_kobj(dev); | |
1520 | int error = 0; | |
1521 | char devt_str[15]; | |
1522 | ||
1523 | if (kobj) { | |
1524 | format_dev_t(devt_str, dev->devt); | |
1525 | error = sysfs_create_link(kobj, &dev->kobj, devt_str); | |
1526 | } | |
1527 | ||
1528 | return error; | |
1529 | } | |
1530 | ||
1531 | static void device_remove_sys_dev_entry(struct device *dev) | |
1532 | { | |
1533 | struct kobject *kobj = device_to_dev_kobj(dev); | |
1534 | char devt_str[15]; | |
1535 | ||
1536 | if (kobj) { | |
1537 | format_dev_t(devt_str, dev->devt); | |
1538 | sysfs_remove_link(kobj, devt_str); | |
1539 | } | |
1540 | } | |
1541 | ||
b4028437 GKH |
1542 | int device_private_init(struct device *dev) |
1543 | { | |
1544 | dev->p = kzalloc(sizeof(*dev->p), GFP_KERNEL); | |
1545 | if (!dev->p) | |
1546 | return -ENOMEM; | |
1547 | dev->p->device = dev; | |
1548 | klist_init(&dev->p->klist_children, klist_children_get, | |
1549 | klist_children_put); | |
ef8a3fd6 | 1550 | INIT_LIST_HEAD(&dev->p->deferred_probe); |
b4028437 GKH |
1551 | return 0; |
1552 | } | |
1553 | ||
1da177e4 | 1554 | /** |
4a3ad20c GKH |
1555 | * device_add - add device to device hierarchy. |
1556 | * @dev: device. | |
1da177e4 | 1557 | * |
4a3ad20c GKH |
1558 | * This is part 2 of device_register(), though may be called |
1559 | * separately _iff_ device_initialize() has been called separately. | |
1da177e4 | 1560 | * |
5739411a | 1561 | * This adds @dev to the kobject hierarchy via kobject_add(), adds it |
4a3ad20c GKH |
1562 | * to the global and sibling lists for the device, then |
1563 | * adds it to the other relevant subsystems of the driver model. | |
5739411a | 1564 | * |
b10d5efd AS |
1565 | * Do not call this routine or device_register() more than once for |
1566 | * any device structure. The driver model core is not designed to work | |
1567 | * with devices that get unregistered and then spring back to life. | |
1568 | * (Among other things, it's very hard to guarantee that all references | |
1569 | * to the previous incarnation of @dev have been dropped.) Allocate | |
1570 | * and register a fresh new struct device instead. | |
1571 | * | |
5739411a CH |
1572 | * NOTE: _Never_ directly free @dev after calling this function, even |
1573 | * if it returned an error! Always use put_device() to give up your | |
1574 | * reference instead. | |
1da177e4 LT |
1575 | */ |
1576 | int device_add(struct device *dev) | |
1577 | { | |
1578 | struct device *parent = NULL; | |
ca22e56d | 1579 | struct kobject *kobj; |
c47ed219 | 1580 | struct class_interface *class_intf; |
c906a48a | 1581 | int error = -EINVAL; |
cebf8fd1 | 1582 | struct kobject *glue_dir = NULL; |
775b64d2 | 1583 | |
1da177e4 | 1584 | dev = get_device(dev); |
c906a48a GKH |
1585 | if (!dev) |
1586 | goto done; | |
1587 | ||
fb069a5d | 1588 | if (!dev->p) { |
b4028437 GKH |
1589 | error = device_private_init(dev); |
1590 | if (error) | |
1591 | goto done; | |
fb069a5d | 1592 | } |
fb069a5d | 1593 | |
1fa5ae85 KS |
1594 | /* |
1595 | * for statically allocated devices, which should all be converted | |
1596 | * some day, we need to initialize the name. We prevent reading back | |
1597 | * the name, and force the use of dev_name() | |
1598 | */ | |
1599 | if (dev->init_name) { | |
acc0e90f | 1600 | dev_set_name(dev, "%s", dev->init_name); |
1fa5ae85 KS |
1601 | dev->init_name = NULL; |
1602 | } | |
c906a48a | 1603 | |
ca22e56d KS |
1604 | /* subsystems can specify simple device enumeration */ |
1605 | if (!dev_name(dev) && dev->bus && dev->bus->dev_name) | |
1606 | dev_set_name(dev, "%s%u", dev->bus->dev_name, dev->id); | |
1607 | ||
e6309e75 TG |
1608 | if (!dev_name(dev)) { |
1609 | error = -EINVAL; | |
5c8563d7 | 1610 | goto name_error; |
e6309e75 | 1611 | } |
1da177e4 | 1612 | |
1e0b2cf9 | 1613 | pr_debug("device: '%s': %s\n", dev_name(dev), __func__); |
c205ef48 | 1614 | |
1da177e4 | 1615 | parent = get_device(dev->parent); |
ca22e56d KS |
1616 | kobj = get_device_parent(dev, parent); |
1617 | if (kobj) | |
1618 | dev->kobj.parent = kobj; | |
1da177e4 | 1619 | |
0d358f22 | 1620 | /* use parent numa_node */ |
56f2de81 | 1621 | if (parent && (dev_to_node(dev) == NUMA_NO_NODE)) |
0d358f22 YL |
1622 | set_dev_node(dev, dev_to_node(parent)); |
1623 | ||
1da177e4 | 1624 | /* first, register with generic layer. */ |
8a577ffc KS |
1625 | /* we require the name to be set before, and pass NULL */ |
1626 | error = kobject_add(&dev->kobj, dev->kobj.parent, NULL); | |
cebf8fd1 ML |
1627 | if (error) { |
1628 | glue_dir = get_glue_dir(dev); | |
1da177e4 | 1629 | goto Error; |
cebf8fd1 | 1630 | } |
a7fd6706 | 1631 | |
37022644 BW |
1632 | /* notify platform of device entry */ |
1633 | if (platform_notify) | |
1634 | platform_notify(dev); | |
1635 | ||
c5e064a6 | 1636 | error = device_create_file(dev, &dev_attr_uevent); |
a306eea4 CH |
1637 | if (error) |
1638 | goto attrError; | |
a7fd6706 | 1639 | |
2ee97caf CH |
1640 | error = device_add_class_symlinks(dev); |
1641 | if (error) | |
1642 | goto SymlinkError; | |
dc0afa83 CH |
1643 | error = device_add_attrs(dev); |
1644 | if (error) | |
2620efef | 1645 | goto AttrsError; |
dc0afa83 CH |
1646 | error = bus_add_device(dev); |
1647 | if (error) | |
1da177e4 | 1648 | goto BusError; |
3b98aeaf | 1649 | error = dpm_sysfs_add(dev); |
57eee3d2 | 1650 | if (error) |
3b98aeaf AS |
1651 | goto DPMError; |
1652 | device_pm_add(dev); | |
ec0676ee | 1653 | |
0cd75047 SK |
1654 | if (MAJOR(dev->devt)) { |
1655 | error = device_create_file(dev, &dev_attr_dev); | |
1656 | if (error) | |
1657 | goto DevAttrError; | |
1658 | ||
1659 | error = device_create_sys_dev_entry(dev); | |
1660 | if (error) | |
1661 | goto SysEntryError; | |
1662 | ||
1663 | devtmpfs_create_node(dev); | |
1664 | } | |
1665 | ||
ec0676ee | 1666 | /* Notify clients of device addition. This call must come |
268863f4 | 1667 | * after dpm_sysfs_add() and before kobject_uevent(). |
ec0676ee AS |
1668 | */ |
1669 | if (dev->bus) | |
1670 | blocking_notifier_call_chain(&dev->bus->p->bus_notifier, | |
1671 | BUS_NOTIFY_ADD_DEVICE, dev); | |
1672 | ||
83b5fb4c | 1673 | kobject_uevent(&dev->kobj, KOBJ_ADD); |
2023c610 | 1674 | bus_probe_device(dev); |
1da177e4 | 1675 | if (parent) |
f791b8c8 GKH |
1676 | klist_add_tail(&dev->p->knode_parent, |
1677 | &parent->p->klist_children); | |
1da177e4 | 1678 | |
5d9fd169 | 1679 | if (dev->class) { |
ca22e56d | 1680 | mutex_lock(&dev->class->p->mutex); |
c47ed219 | 1681 | /* tie the class to the device */ |
5a3ceb86 | 1682 | klist_add_tail(&dev->knode_class, |
6b6e39a6 | 1683 | &dev->class->p->klist_devices); |
c47ed219 GKH |
1684 | |
1685 | /* notify any interfaces that the device is here */ | |
184f1f77 | 1686 | list_for_each_entry(class_intf, |
ca22e56d | 1687 | &dev->class->p->interfaces, node) |
c47ed219 GKH |
1688 | if (class_intf->add_dev) |
1689 | class_intf->add_dev(dev, class_intf); | |
ca22e56d | 1690 | mutex_unlock(&dev->class->p->mutex); |
5d9fd169 | 1691 | } |
c906a48a | 1692 | done: |
1da177e4 LT |
1693 | put_device(dev); |
1694 | return error; | |
0cd75047 SK |
1695 | SysEntryError: |
1696 | if (MAJOR(dev->devt)) | |
1697 | device_remove_file(dev, &dev_attr_dev); | |
1698 | DevAttrError: | |
1699 | device_pm_remove(dev); | |
1700 | dpm_sysfs_remove(dev); | |
3b98aeaf | 1701 | DPMError: |
57eee3d2 RW |
1702 | bus_remove_device(dev); |
1703 | BusError: | |
82f0cf9b | 1704 | device_remove_attrs(dev); |
2620efef | 1705 | AttrsError: |
2ee97caf CH |
1706 | device_remove_class_symlinks(dev); |
1707 | SymlinkError: | |
c5e064a6 | 1708 | device_remove_file(dev, &dev_attr_uevent); |
23681e47 | 1709 | attrError: |
312c004d | 1710 | kobject_uevent(&dev->kobj, KOBJ_REMOVE); |
cebf8fd1 | 1711 | glue_dir = get_glue_dir(dev); |
1da177e4 LT |
1712 | kobject_del(&dev->kobj); |
1713 | Error: | |
cebf8fd1 | 1714 | cleanup_glue_dir(dev, glue_dir); |
5f0163a5 | 1715 | put_device(parent); |
5c8563d7 KS |
1716 | name_error: |
1717 | kfree(dev->p); | |
1718 | dev->p = NULL; | |
c906a48a | 1719 | goto done; |
1da177e4 | 1720 | } |
86df2687 | 1721 | EXPORT_SYMBOL_GPL(device_add); |
1da177e4 | 1722 | |
1da177e4 | 1723 | /** |
4a3ad20c GKH |
1724 | * device_register - register a device with the system. |
1725 | * @dev: pointer to the device structure | |
1da177e4 | 1726 | * |
4a3ad20c GKH |
1727 | * This happens in two clean steps - initialize the device |
1728 | * and add it to the system. The two steps can be called | |
1729 | * separately, but this is the easiest and most common. | |
1730 | * I.e. you should only call the two helpers separately if | |
1731 | * have a clearly defined need to use and refcount the device | |
1732 | * before it is added to the hierarchy. | |
5739411a | 1733 | * |
b10d5efd AS |
1734 | * For more information, see the kerneldoc for device_initialize() |
1735 | * and device_add(). | |
1736 | * | |
5739411a CH |
1737 | * NOTE: _Never_ directly free @dev after calling this function, even |
1738 | * if it returned an error! Always use put_device() to give up the | |
1739 | * reference initialized in this function instead. | |
1da177e4 | 1740 | */ |
1da177e4 LT |
1741 | int device_register(struct device *dev) |
1742 | { | |
1743 | device_initialize(dev); | |
1744 | return device_add(dev); | |
1745 | } | |
86df2687 | 1746 | EXPORT_SYMBOL_GPL(device_register); |
1da177e4 | 1747 | |
1da177e4 | 1748 | /** |
4a3ad20c GKH |
1749 | * get_device - increment reference count for device. |
1750 | * @dev: device. | |
1da177e4 | 1751 | * |
4a3ad20c GKH |
1752 | * This simply forwards the call to kobject_get(), though |
1753 | * we do take care to provide for the case that we get a NULL | |
1754 | * pointer passed in. | |
1da177e4 | 1755 | */ |
4a3ad20c | 1756 | struct device *get_device(struct device *dev) |
1da177e4 | 1757 | { |
b0d1f807 | 1758 | return dev ? kobj_to_dev(kobject_get(&dev->kobj)) : NULL; |
1da177e4 | 1759 | } |
86df2687 | 1760 | EXPORT_SYMBOL_GPL(get_device); |
1da177e4 | 1761 | |
1da177e4 | 1762 | /** |
4a3ad20c GKH |
1763 | * put_device - decrement reference count. |
1764 | * @dev: device in question. | |
1da177e4 | 1765 | */ |
4a3ad20c | 1766 | void put_device(struct device *dev) |
1da177e4 | 1767 | { |
edfaa7c3 | 1768 | /* might_sleep(); */ |
1da177e4 LT |
1769 | if (dev) |
1770 | kobject_put(&dev->kobj); | |
1771 | } | |
86df2687 | 1772 | EXPORT_SYMBOL_GPL(put_device); |
1da177e4 | 1773 | |
1da177e4 | 1774 | /** |
4a3ad20c GKH |
1775 | * device_del - delete device from system. |
1776 | * @dev: device. | |
1da177e4 | 1777 | * |
4a3ad20c GKH |
1778 | * This is the first part of the device unregistration |
1779 | * sequence. This removes the device from the lists we control | |
1780 | * from here, has it removed from the other driver model | |
1781 | * subsystems it was added to in device_add(), and removes it | |
1782 | * from the kobject hierarchy. | |
1da177e4 | 1783 | * |
4a3ad20c GKH |
1784 | * NOTE: this should be called manually _iff_ device_add() was |
1785 | * also called manually. | |
1da177e4 | 1786 | */ |
4a3ad20c | 1787 | void device_del(struct device *dev) |
1da177e4 | 1788 | { |
4a3ad20c | 1789 | struct device *parent = dev->parent; |
cebf8fd1 | 1790 | struct kobject *glue_dir = NULL; |
c47ed219 | 1791 | struct class_interface *class_intf; |
1da177e4 | 1792 | |
ec0676ee AS |
1793 | /* Notify clients of device removal. This call must come |
1794 | * before dpm_sysfs_remove(). | |
1795 | */ | |
1796 | if (dev->bus) | |
1797 | blocking_notifier_call_chain(&dev->bus->p->bus_notifier, | |
1798 | BUS_NOTIFY_DEL_DEVICE, dev); | |
9ed98953 RW |
1799 | |
1800 | device_links_purge(dev); | |
3b98aeaf | 1801 | dpm_sysfs_remove(dev); |
1da177e4 | 1802 | if (parent) |
f791b8c8 | 1803 | klist_del(&dev->p->knode_parent); |
e105b8bf | 1804 | if (MAJOR(dev->devt)) { |
2b2af54a | 1805 | devtmpfs_delete_node(dev); |
e105b8bf | 1806 | device_remove_sys_dev_entry(dev); |
c5e064a6 | 1807 | device_remove_file(dev, &dev_attr_dev); |
e105b8bf | 1808 | } |
b9d9c82b | 1809 | if (dev->class) { |
da231fd5 | 1810 | device_remove_class_symlinks(dev); |
99ef3ef8 | 1811 | |
ca22e56d | 1812 | mutex_lock(&dev->class->p->mutex); |
c47ed219 | 1813 | /* notify any interfaces that the device is now gone */ |
184f1f77 | 1814 | list_for_each_entry(class_intf, |
ca22e56d | 1815 | &dev->class->p->interfaces, node) |
c47ed219 GKH |
1816 | if (class_intf->remove_dev) |
1817 | class_intf->remove_dev(dev, class_intf); | |
1818 | /* remove the device from the class list */ | |
5a3ceb86 | 1819 | klist_del(&dev->knode_class); |
ca22e56d | 1820 | mutex_unlock(&dev->class->p->mutex); |
b9d9c82b | 1821 | } |
c5e064a6 | 1822 | device_remove_file(dev, &dev_attr_uevent); |
2620efef | 1823 | device_remove_attrs(dev); |
28953533 | 1824 | bus_remove_device(dev); |
4b6d1f12 | 1825 | device_pm_remove(dev); |
d1c3414c | 1826 | driver_deferred_probe_del(dev); |
478573c9 | 1827 | device_remove_properties(dev); |
1da177e4 LT |
1828 | |
1829 | /* Notify the platform of the removal, in case they | |
1830 | * need to do anything... | |
1831 | */ | |
1832 | if (platform_notify_remove) | |
1833 | platform_notify_remove(dev); | |
599bad38 JR |
1834 | if (dev->bus) |
1835 | blocking_notifier_call_chain(&dev->bus->p->bus_notifier, | |
1836 | BUS_NOTIFY_REMOVED_DEVICE, dev); | |
312c004d | 1837 | kobject_uevent(&dev->kobj, KOBJ_REMOVE); |
cebf8fd1 | 1838 | glue_dir = get_glue_dir(dev); |
1da177e4 | 1839 | kobject_del(&dev->kobj); |
cebf8fd1 | 1840 | cleanup_glue_dir(dev, glue_dir); |
da231fd5 | 1841 | put_device(parent); |
1da177e4 | 1842 | } |
86df2687 | 1843 | EXPORT_SYMBOL_GPL(device_del); |
1da177e4 LT |
1844 | |
1845 | /** | |
4a3ad20c GKH |
1846 | * device_unregister - unregister device from system. |
1847 | * @dev: device going away. | |
1da177e4 | 1848 | * |
4a3ad20c GKH |
1849 | * We do this in two parts, like we do device_register(). First, |
1850 | * we remove it from all the subsystems with device_del(), then | |
1851 | * we decrement the reference count via put_device(). If that | |
1852 | * is the final reference count, the device will be cleaned up | |
1853 | * via device_release() above. Otherwise, the structure will | |
1854 | * stick around until the final reference to the device is dropped. | |
1da177e4 | 1855 | */ |
4a3ad20c | 1856 | void device_unregister(struct device *dev) |
1da177e4 | 1857 | { |
1e0b2cf9 | 1858 | pr_debug("device: '%s': %s\n", dev_name(dev), __func__); |
1da177e4 LT |
1859 | device_del(dev); |
1860 | put_device(dev); | |
1861 | } | |
86df2687 | 1862 | EXPORT_SYMBOL_GPL(device_unregister); |
1da177e4 | 1863 | |
3d060aeb AS |
1864 | static struct device *prev_device(struct klist_iter *i) |
1865 | { | |
1866 | struct klist_node *n = klist_prev(i); | |
1867 | struct device *dev = NULL; | |
1868 | struct device_private *p; | |
1869 | ||
1870 | if (n) { | |
1871 | p = to_device_private_parent(n); | |
1872 | dev = p->device; | |
1873 | } | |
1874 | return dev; | |
1875 | } | |
1876 | ||
4a3ad20c | 1877 | static struct device *next_device(struct klist_iter *i) |
36239577 | 1878 | { |
4a3ad20c | 1879 | struct klist_node *n = klist_next(i); |
f791b8c8 GKH |
1880 | struct device *dev = NULL; |
1881 | struct device_private *p; | |
1882 | ||
1883 | if (n) { | |
1884 | p = to_device_private_parent(n); | |
1885 | dev = p->device; | |
1886 | } | |
1887 | return dev; | |
36239577 PM |
1888 | } |
1889 | ||
6fcf53ac | 1890 | /** |
e454cea2 | 1891 | * device_get_devnode - path of device node file |
6fcf53ac | 1892 | * @dev: device |
e454cea2 | 1893 | * @mode: returned file access mode |
3c2670e6 KS |
1894 | * @uid: returned file owner |
1895 | * @gid: returned file group | |
6fcf53ac KS |
1896 | * @tmp: possibly allocated string |
1897 | * | |
1898 | * Return the relative path of a possible device node. | |
1899 | * Non-default names may need to allocate a memory to compose | |
1900 | * a name. This memory is returned in tmp and needs to be | |
1901 | * freed by the caller. | |
1902 | */ | |
e454cea2 | 1903 | const char *device_get_devnode(struct device *dev, |
4e4098a3 | 1904 | umode_t *mode, kuid_t *uid, kgid_t *gid, |
3c2670e6 | 1905 | const char **tmp) |
6fcf53ac KS |
1906 | { |
1907 | char *s; | |
1908 | ||
1909 | *tmp = NULL; | |
1910 | ||
1911 | /* the device type may provide a specific name */ | |
e454cea2 | 1912 | if (dev->type && dev->type->devnode) |
3c2670e6 | 1913 | *tmp = dev->type->devnode(dev, mode, uid, gid); |
6fcf53ac KS |
1914 | if (*tmp) |
1915 | return *tmp; | |
1916 | ||
1917 | /* the class may provide a specific name */ | |
e454cea2 KS |
1918 | if (dev->class && dev->class->devnode) |
1919 | *tmp = dev->class->devnode(dev, mode); | |
6fcf53ac KS |
1920 | if (*tmp) |
1921 | return *tmp; | |
1922 | ||
1923 | /* return name without allocation, tmp == NULL */ | |
1924 | if (strchr(dev_name(dev), '!') == NULL) | |
1925 | return dev_name(dev); | |
1926 | ||
1927 | /* replace '!' in the name with '/' */ | |
a29fd614 RV |
1928 | s = kstrdup(dev_name(dev), GFP_KERNEL); |
1929 | if (!s) | |
6fcf53ac | 1930 | return NULL; |
a29fd614 RV |
1931 | strreplace(s, '!', '/'); |
1932 | return *tmp = s; | |
6fcf53ac KS |
1933 | } |
1934 | ||
1da177e4 | 1935 | /** |
4a3ad20c GKH |
1936 | * device_for_each_child - device child iterator. |
1937 | * @parent: parent struct device. | |
4a3ad20c | 1938 | * @fn: function to be called for each device. |
f8878dcb | 1939 | * @data: data for the callback. |
1da177e4 | 1940 | * |
4a3ad20c GKH |
1941 | * Iterate over @parent's child devices, and call @fn for each, |
1942 | * passing it @data. | |
1da177e4 | 1943 | * |
4a3ad20c GKH |
1944 | * We check the return of @fn each time. If it returns anything |
1945 | * other than 0, we break out and return that value. | |
1da177e4 | 1946 | */ |
4a3ad20c GKH |
1947 | int device_for_each_child(struct device *parent, void *data, |
1948 | int (*fn)(struct device *dev, void *data)) | |
1da177e4 | 1949 | { |
36239577 | 1950 | struct klist_iter i; |
4a3ad20c | 1951 | struct device *child; |
1da177e4 LT |
1952 | int error = 0; |
1953 | ||
014c90db GKH |
1954 | if (!parent->p) |
1955 | return 0; | |
1956 | ||
f791b8c8 | 1957 | klist_iter_init(&parent->p->klist_children, &i); |
36239577 PM |
1958 | while ((child = next_device(&i)) && !error) |
1959 | error = fn(child, data); | |
1960 | klist_iter_exit(&i); | |
1da177e4 LT |
1961 | return error; |
1962 | } | |
86df2687 | 1963 | EXPORT_SYMBOL_GPL(device_for_each_child); |
1da177e4 | 1964 | |
3d060aeb AS |
1965 | /** |
1966 | * device_for_each_child_reverse - device child iterator in reversed order. | |
1967 | * @parent: parent struct device. | |
1968 | * @fn: function to be called for each device. | |
1969 | * @data: data for the callback. | |
1970 | * | |
1971 | * Iterate over @parent's child devices, and call @fn for each, | |
1972 | * passing it @data. | |
1973 | * | |
1974 | * We check the return of @fn each time. If it returns anything | |
1975 | * other than 0, we break out and return that value. | |
1976 | */ | |
1977 | int device_for_each_child_reverse(struct device *parent, void *data, | |
1978 | int (*fn)(struct device *dev, void *data)) | |
1979 | { | |
1980 | struct klist_iter i; | |
1981 | struct device *child; | |
1982 | int error = 0; | |
1983 | ||
1984 | if (!parent->p) | |
1985 | return 0; | |
1986 | ||
1987 | klist_iter_init(&parent->p->klist_children, &i); | |
1988 | while ((child = prev_device(&i)) && !error) | |
1989 | error = fn(child, data); | |
1990 | klist_iter_exit(&i); | |
1991 | return error; | |
1992 | } | |
1993 | EXPORT_SYMBOL_GPL(device_for_each_child_reverse); | |
1994 | ||
5ab69981 CH |
1995 | /** |
1996 | * device_find_child - device iterator for locating a particular device. | |
1997 | * @parent: parent struct device | |
5ab69981 | 1998 | * @match: Callback function to check device |
f8878dcb | 1999 | * @data: Data to pass to match function |
5ab69981 CH |
2000 | * |
2001 | * This is similar to the device_for_each_child() function above, but it | |
2002 | * returns a reference to a device that is 'found' for later use, as | |
2003 | * determined by the @match callback. | |
2004 | * | |
2005 | * The callback should return 0 if the device doesn't match and non-zero | |
2006 | * if it does. If the callback returns non-zero and a reference to the | |
2007 | * current device can be obtained, this function will return to the caller | |
2008 | * and not iterate over any more devices. | |
a4e2400a FV |
2009 | * |
2010 | * NOTE: you will need to drop the reference with put_device() after use. | |
5ab69981 | 2011 | */ |
4a3ad20c GKH |
2012 | struct device *device_find_child(struct device *parent, void *data, |
2013 | int (*match)(struct device *dev, void *data)) | |
5ab69981 CH |
2014 | { |
2015 | struct klist_iter i; | |
2016 | struct device *child; | |
2017 | ||
2018 | if (!parent) | |
2019 | return NULL; | |
2020 | ||
f791b8c8 | 2021 | klist_iter_init(&parent->p->klist_children, &i); |
5ab69981 CH |
2022 | while ((child = next_device(&i))) |
2023 | if (match(child, data) && get_device(child)) | |
2024 | break; | |
2025 | klist_iter_exit(&i); | |
2026 | return child; | |
2027 | } | |
86df2687 | 2028 | EXPORT_SYMBOL_GPL(device_find_child); |
5ab69981 | 2029 | |
1da177e4 LT |
2030 | int __init devices_init(void) |
2031 | { | |
881c6cfd GKH |
2032 | devices_kset = kset_create_and_add("devices", &device_uevent_ops, NULL); |
2033 | if (!devices_kset) | |
2034 | return -ENOMEM; | |
e105b8bf DW |
2035 | dev_kobj = kobject_create_and_add("dev", NULL); |
2036 | if (!dev_kobj) | |
2037 | goto dev_kobj_err; | |
2038 | sysfs_dev_block_kobj = kobject_create_and_add("block", dev_kobj); | |
2039 | if (!sysfs_dev_block_kobj) | |
2040 | goto block_kobj_err; | |
2041 | sysfs_dev_char_kobj = kobject_create_and_add("char", dev_kobj); | |
2042 | if (!sysfs_dev_char_kobj) | |
2043 | goto char_kobj_err; | |
2044 | ||
881c6cfd | 2045 | return 0; |
e105b8bf DW |
2046 | |
2047 | char_kobj_err: | |
2048 | kobject_put(sysfs_dev_block_kobj); | |
2049 | block_kobj_err: | |
2050 | kobject_put(dev_kobj); | |
2051 | dev_kobj_err: | |
2052 | kset_unregister(devices_kset); | |
2053 | return -ENOMEM; | |
1da177e4 LT |
2054 | } |
2055 | ||
4f3549d7 RW |
2056 | static int device_check_offline(struct device *dev, void *not_used) |
2057 | { | |
2058 | int ret; | |
2059 | ||
2060 | ret = device_for_each_child(dev, NULL, device_check_offline); | |
2061 | if (ret) | |
2062 | return ret; | |
2063 | ||
2064 | return device_supports_offline(dev) && !dev->offline ? -EBUSY : 0; | |
2065 | } | |
2066 | ||
2067 | /** | |
2068 | * device_offline - Prepare the device for hot-removal. | |
2069 | * @dev: Device to be put offline. | |
2070 | * | |
2071 | * Execute the device bus type's .offline() callback, if present, to prepare | |
2072 | * the device for a subsequent hot-removal. If that succeeds, the device must | |
2073 | * not be used until either it is removed or its bus type's .online() callback | |
2074 | * is executed. | |
2075 | * | |
2076 | * Call under device_hotplug_lock. | |
2077 | */ | |
2078 | int device_offline(struct device *dev) | |
2079 | { | |
2080 | int ret; | |
2081 | ||
2082 | if (dev->offline_disabled) | |
2083 | return -EPERM; | |
2084 | ||
2085 | ret = device_for_each_child(dev, NULL, device_check_offline); | |
2086 | if (ret) | |
2087 | return ret; | |
2088 | ||
2089 | device_lock(dev); | |
2090 | if (device_supports_offline(dev)) { | |
2091 | if (dev->offline) { | |
2092 | ret = 1; | |
2093 | } else { | |
2094 | ret = dev->bus->offline(dev); | |
2095 | if (!ret) { | |
2096 | kobject_uevent(&dev->kobj, KOBJ_OFFLINE); | |
2097 | dev->offline = true; | |
2098 | } | |
2099 | } | |
2100 | } | |
2101 | device_unlock(dev); | |
2102 | ||
2103 | return ret; | |
2104 | } | |
2105 | ||
2106 | /** | |
2107 | * device_online - Put the device back online after successful device_offline(). | |
2108 | * @dev: Device to be put back online. | |
2109 | * | |
2110 | * If device_offline() has been successfully executed for @dev, but the device | |
2111 | * has not been removed subsequently, execute its bus type's .online() callback | |
2112 | * to indicate that the device can be used again. | |
2113 | * | |
2114 | * Call under device_hotplug_lock. | |
2115 | */ | |
2116 | int device_online(struct device *dev) | |
2117 | { | |
2118 | int ret = 0; | |
2119 | ||
2120 | device_lock(dev); | |
2121 | if (device_supports_offline(dev)) { | |
2122 | if (dev->offline) { | |
2123 | ret = dev->bus->online(dev); | |
2124 | if (!ret) { | |
2125 | kobject_uevent(&dev->kobj, KOBJ_ONLINE); | |
2126 | dev->offline = false; | |
2127 | } | |
2128 | } else { | |
2129 | ret = 1; | |
2130 | } | |
2131 | } | |
2132 | device_unlock(dev); | |
2133 | ||
2134 | return ret; | |
2135 | } | |
2136 | ||
7f100d15 | 2137 | struct root_device { |
0aa0dc41 MM |
2138 | struct device dev; |
2139 | struct module *owner; | |
2140 | }; | |
2141 | ||
93058424 | 2142 | static inline struct root_device *to_root_device(struct device *d) |
481e2079 FW |
2143 | { |
2144 | return container_of(d, struct root_device, dev); | |
2145 | } | |
0aa0dc41 MM |
2146 | |
2147 | static void root_device_release(struct device *dev) | |
2148 | { | |
2149 | kfree(to_root_device(dev)); | |
2150 | } | |
2151 | ||
2152 | /** | |
2153 | * __root_device_register - allocate and register a root device | |
2154 | * @name: root device name | |
2155 | * @owner: owner module of the root device, usually THIS_MODULE | |
2156 | * | |
2157 | * This function allocates a root device and registers it | |
2158 | * using device_register(). In order to free the returned | |
2159 | * device, use root_device_unregister(). | |
2160 | * | |
2161 | * Root devices are dummy devices which allow other devices | |
2162 | * to be grouped under /sys/devices. Use this function to | |
2163 | * allocate a root device and then use it as the parent of | |
2164 | * any device which should appear under /sys/devices/{name} | |
2165 | * | |
2166 | * The /sys/devices/{name} directory will also contain a | |
2167 | * 'module' symlink which points to the @owner directory | |
2168 | * in sysfs. | |
2169 | * | |
f0eae0ed JN |
2170 | * Returns &struct device pointer on success, or ERR_PTR() on error. |
2171 | * | |
0aa0dc41 MM |
2172 | * Note: You probably want to use root_device_register(). |
2173 | */ | |
2174 | struct device *__root_device_register(const char *name, struct module *owner) | |
2175 | { | |
2176 | struct root_device *root; | |
2177 | int err = -ENOMEM; | |
2178 | ||
2179 | root = kzalloc(sizeof(struct root_device), GFP_KERNEL); | |
2180 | if (!root) | |
2181 | return ERR_PTR(err); | |
2182 | ||
acc0e90f | 2183 | err = dev_set_name(&root->dev, "%s", name); |
0aa0dc41 MM |
2184 | if (err) { |
2185 | kfree(root); | |
2186 | return ERR_PTR(err); | |
2187 | } | |
2188 | ||
2189 | root->dev.release = root_device_release; | |
2190 | ||
2191 | err = device_register(&root->dev); | |
2192 | if (err) { | |
2193 | put_device(&root->dev); | |
2194 | return ERR_PTR(err); | |
2195 | } | |
2196 | ||
1d9e882b | 2197 | #ifdef CONFIG_MODULES /* gotta find a "cleaner" way to do this */ |
0aa0dc41 MM |
2198 | if (owner) { |
2199 | struct module_kobject *mk = &owner->mkobj; | |
2200 | ||
2201 | err = sysfs_create_link(&root->dev.kobj, &mk->kobj, "module"); | |
2202 | if (err) { | |
2203 | device_unregister(&root->dev); | |
2204 | return ERR_PTR(err); | |
2205 | } | |
2206 | root->owner = owner; | |
2207 | } | |
2208 | #endif | |
2209 | ||
2210 | return &root->dev; | |
2211 | } | |
2212 | EXPORT_SYMBOL_GPL(__root_device_register); | |
2213 | ||
2214 | /** | |
2215 | * root_device_unregister - unregister and free a root device | |
7cbcf225 | 2216 | * @dev: device going away |
0aa0dc41 MM |
2217 | * |
2218 | * This function unregisters and cleans up a device that was created by | |
2219 | * root_device_register(). | |
2220 | */ | |
2221 | void root_device_unregister(struct device *dev) | |
2222 | { | |
2223 | struct root_device *root = to_root_device(dev); | |
2224 | ||
2225 | if (root->owner) | |
2226 | sysfs_remove_link(&root->dev.kobj, "module"); | |
2227 | ||
2228 | device_unregister(dev); | |
2229 | } | |
2230 | EXPORT_SYMBOL_GPL(root_device_unregister); | |
2231 | ||
23681e47 GKH |
2232 | |
2233 | static void device_create_release(struct device *dev) | |
2234 | { | |
1e0b2cf9 | 2235 | pr_debug("device: '%s': %s\n", dev_name(dev), __func__); |
23681e47 GKH |
2236 | kfree(dev); |
2237 | } | |
2238 | ||
39ef3112 GR |
2239 | static struct device * |
2240 | device_create_groups_vargs(struct class *class, struct device *parent, | |
2241 | dev_t devt, void *drvdata, | |
2242 | const struct attribute_group **groups, | |
2243 | const char *fmt, va_list args) | |
23681e47 | 2244 | { |
23681e47 GKH |
2245 | struct device *dev = NULL; |
2246 | int retval = -ENODEV; | |
2247 | ||
2248 | if (class == NULL || IS_ERR(class)) | |
2249 | goto error; | |
23681e47 GKH |
2250 | |
2251 | dev = kzalloc(sizeof(*dev), GFP_KERNEL); | |
2252 | if (!dev) { | |
2253 | retval = -ENOMEM; | |
2254 | goto error; | |
2255 | } | |
2256 | ||
bbc780f8 | 2257 | device_initialize(dev); |
23681e47 GKH |
2258 | dev->devt = devt; |
2259 | dev->class = class; | |
2260 | dev->parent = parent; | |
39ef3112 | 2261 | dev->groups = groups; |
23681e47 | 2262 | dev->release = device_create_release; |
8882b394 | 2263 | dev_set_drvdata(dev, drvdata); |
23681e47 | 2264 | |
1fa5ae85 KS |
2265 | retval = kobject_set_name_vargs(&dev->kobj, fmt, args); |
2266 | if (retval) | |
2267 | goto error; | |
2268 | ||
bbc780f8 | 2269 | retval = device_add(dev); |
23681e47 GKH |
2270 | if (retval) |
2271 | goto error; | |
2272 | ||
23681e47 GKH |
2273 | return dev; |
2274 | ||
2275 | error: | |
286661b3 | 2276 | put_device(dev); |
23681e47 GKH |
2277 | return ERR_PTR(retval); |
2278 | } | |
39ef3112 GR |
2279 | |
2280 | /** | |
2281 | * device_create_vargs - creates a device and registers it with sysfs | |
2282 | * @class: pointer to the struct class that this device should be registered to | |
2283 | * @parent: pointer to the parent struct device of this new device, if any | |
2284 | * @devt: the dev_t for the char device to be added | |
2285 | * @drvdata: the data to be added to the device for callbacks | |
2286 | * @fmt: string for the device's name | |
2287 | * @args: va_list for the device's name | |
2288 | * | |
2289 | * This function can be used by char device classes. A struct device | |
2290 | * will be created in sysfs, registered to the specified class. | |
2291 | * | |
2292 | * A "dev" file will be created, showing the dev_t for the device, if | |
2293 | * the dev_t is not 0,0. | |
2294 | * If a pointer to a parent struct device is passed in, the newly created | |
2295 | * struct device will be a child of that device in sysfs. | |
2296 | * The pointer to the struct device will be returned from the call. | |
2297 | * Any further sysfs files that might be required can be created using this | |
2298 | * pointer. | |
2299 | * | |
2300 | * Returns &struct device pointer on success, or ERR_PTR() on error. | |
2301 | * | |
2302 | * Note: the struct class passed to this function must have previously | |
2303 | * been created with a call to class_create(). | |
2304 | */ | |
2305 | struct device *device_create_vargs(struct class *class, struct device *parent, | |
2306 | dev_t devt, void *drvdata, const char *fmt, | |
2307 | va_list args) | |
2308 | { | |
2309 | return device_create_groups_vargs(class, parent, devt, drvdata, NULL, | |
2310 | fmt, args); | |
2311 | } | |
8882b394 GKH |
2312 | EXPORT_SYMBOL_GPL(device_create_vargs); |
2313 | ||
2314 | /** | |
4e106739 | 2315 | * device_create - creates a device and registers it with sysfs |
8882b394 GKH |
2316 | * @class: pointer to the struct class that this device should be registered to |
2317 | * @parent: pointer to the parent struct device of this new device, if any | |
2318 | * @devt: the dev_t for the char device to be added | |
2319 | * @drvdata: the data to be added to the device for callbacks | |
2320 | * @fmt: string for the device's name | |
2321 | * | |
2322 | * This function can be used by char device classes. A struct device | |
2323 | * will be created in sysfs, registered to the specified class. | |
2324 | * | |
2325 | * A "dev" file will be created, showing the dev_t for the device, if | |
2326 | * the dev_t is not 0,0. | |
2327 | * If a pointer to a parent struct device is passed in, the newly created | |
2328 | * struct device will be a child of that device in sysfs. | |
2329 | * The pointer to the struct device will be returned from the call. | |
2330 | * Any further sysfs files that might be required can be created using this | |
2331 | * pointer. | |
2332 | * | |
f0eae0ed JN |
2333 | * Returns &struct device pointer on success, or ERR_PTR() on error. |
2334 | * | |
8882b394 GKH |
2335 | * Note: the struct class passed to this function must have previously |
2336 | * been created with a call to class_create(). | |
2337 | */ | |
4e106739 GKH |
2338 | struct device *device_create(struct class *class, struct device *parent, |
2339 | dev_t devt, void *drvdata, const char *fmt, ...) | |
8882b394 GKH |
2340 | { |
2341 | va_list vargs; | |
2342 | struct device *dev; | |
2343 | ||
2344 | va_start(vargs, fmt); | |
2345 | dev = device_create_vargs(class, parent, devt, drvdata, fmt, vargs); | |
2346 | va_end(vargs); | |
2347 | return dev; | |
2348 | } | |
4e106739 | 2349 | EXPORT_SYMBOL_GPL(device_create); |
8882b394 | 2350 | |
39ef3112 GR |
2351 | /** |
2352 | * device_create_with_groups - creates a device and registers it with sysfs | |
2353 | * @class: pointer to the struct class that this device should be registered to | |
2354 | * @parent: pointer to the parent struct device of this new device, if any | |
2355 | * @devt: the dev_t for the char device to be added | |
2356 | * @drvdata: the data to be added to the device for callbacks | |
2357 | * @groups: NULL-terminated list of attribute groups to be created | |
2358 | * @fmt: string for the device's name | |
2359 | * | |
2360 | * This function can be used by char device classes. A struct device | |
2361 | * will be created in sysfs, registered to the specified class. | |
2362 | * Additional attributes specified in the groups parameter will also | |
2363 | * be created automatically. | |
2364 | * | |
2365 | * A "dev" file will be created, showing the dev_t for the device, if | |
2366 | * the dev_t is not 0,0. | |
2367 | * If a pointer to a parent struct device is passed in, the newly created | |
2368 | * struct device will be a child of that device in sysfs. | |
2369 | * The pointer to the struct device will be returned from the call. | |
2370 | * Any further sysfs files that might be required can be created using this | |
2371 | * pointer. | |
2372 | * | |
2373 | * Returns &struct device pointer on success, or ERR_PTR() on error. | |
2374 | * | |
2375 | * Note: the struct class passed to this function must have previously | |
2376 | * been created with a call to class_create(). | |
2377 | */ | |
2378 | struct device *device_create_with_groups(struct class *class, | |
2379 | struct device *parent, dev_t devt, | |
2380 | void *drvdata, | |
2381 | const struct attribute_group **groups, | |
2382 | const char *fmt, ...) | |
2383 | { | |
2384 | va_list vargs; | |
2385 | struct device *dev; | |
2386 | ||
2387 | va_start(vargs, fmt); | |
2388 | dev = device_create_groups_vargs(class, parent, devt, drvdata, groups, | |
2389 | fmt, vargs); | |
2390 | va_end(vargs); | |
2391 | return dev; | |
2392 | } | |
2393 | EXPORT_SYMBOL_GPL(device_create_with_groups); | |
2394 | ||
9f3b795a | 2395 | static int __match_devt(struct device *dev, const void *data) |
23681e47 | 2396 | { |
9f3b795a | 2397 | const dev_t *devt = data; |
23681e47 | 2398 | |
cd35449b | 2399 | return dev->devt == *devt; |
775b64d2 RW |
2400 | } |
2401 | ||
2402 | /** | |
2403 | * device_destroy - removes a device that was created with device_create() | |
2404 | * @class: pointer to the struct class that this device was registered with | |
2405 | * @devt: the dev_t of the device that was previously registered | |
2406 | * | |
2407 | * This call unregisters and cleans up a device that was created with a | |
2408 | * call to device_create(). | |
2409 | */ | |
2410 | void device_destroy(struct class *class, dev_t devt) | |
2411 | { | |
2412 | struct device *dev; | |
23681e47 | 2413 | |
695794ae | 2414 | dev = class_find_device(class, NULL, &devt, __match_devt); |
cd35449b DY |
2415 | if (dev) { |
2416 | put_device(dev); | |
23681e47 | 2417 | device_unregister(dev); |
cd35449b | 2418 | } |
23681e47 GKH |
2419 | } |
2420 | EXPORT_SYMBOL_GPL(device_destroy); | |
a2de48ca GKH |
2421 | |
2422 | /** | |
2423 | * device_rename - renames a device | |
2424 | * @dev: the pointer to the struct device to be renamed | |
2425 | * @new_name: the new name of the device | |
030c1d2b EB |
2426 | * |
2427 | * It is the responsibility of the caller to provide mutual | |
2428 | * exclusion between two different calls of device_rename | |
2429 | * on the same device to ensure that new_name is valid and | |
2430 | * won't conflict with other devices. | |
c6c0ac66 | 2431 | * |
a5462516 TT |
2432 | * Note: Don't call this function. Currently, the networking layer calls this |
2433 | * function, but that will change. The following text from Kay Sievers offers | |
2434 | * some insight: | |
2435 | * | |
2436 | * Renaming devices is racy at many levels, symlinks and other stuff are not | |
2437 | * replaced atomically, and you get a "move" uevent, but it's not easy to | |
2438 | * connect the event to the old and new device. Device nodes are not renamed at | |
2439 | * all, there isn't even support for that in the kernel now. | |
2440 | * | |
2441 | * In the meantime, during renaming, your target name might be taken by another | |
2442 | * driver, creating conflicts. Or the old name is taken directly after you | |
2443 | * renamed it -- then you get events for the same DEVPATH, before you even see | |
2444 | * the "move" event. It's just a mess, and nothing new should ever rely on | |
2445 | * kernel device renaming. Besides that, it's not even implemented now for | |
2446 | * other things than (driver-core wise very simple) network devices. | |
2447 | * | |
2448 | * We are currently about to change network renaming in udev to completely | |
2449 | * disallow renaming of devices in the same namespace as the kernel uses, | |
2450 | * because we can't solve the problems properly, that arise with swapping names | |
2451 | * of multiple interfaces without races. Means, renaming of eth[0-9]* will only | |
2452 | * be allowed to some other name than eth[0-9]*, for the aforementioned | |
2453 | * reasons. | |
2454 | * | |
2455 | * Make up a "real" name in the driver before you register anything, or add | |
2456 | * some other attributes for userspace to find the device, or use udev to add | |
2457 | * symlinks -- but never rename kernel devices later, it's a complete mess. We | |
2458 | * don't even want to get into that and try to implement the missing pieces in | |
2459 | * the core. We really have other pieces to fix in the driver core mess. :) | |
a2de48ca | 2460 | */ |
6937e8f8 | 2461 | int device_rename(struct device *dev, const char *new_name) |
a2de48ca | 2462 | { |
4b30ee58 | 2463 | struct kobject *kobj = &dev->kobj; |
2ee97caf | 2464 | char *old_device_name = NULL; |
a2de48ca GKH |
2465 | int error; |
2466 | ||
2467 | dev = get_device(dev); | |
2468 | if (!dev) | |
2469 | return -EINVAL; | |
2470 | ||
69df7533 | 2471 | dev_dbg(dev, "renaming to %s\n", new_name); |
a2de48ca | 2472 | |
1fa5ae85 | 2473 | old_device_name = kstrdup(dev_name(dev), GFP_KERNEL); |
2ee97caf CH |
2474 | if (!old_device_name) { |
2475 | error = -ENOMEM; | |
2476 | goto out; | |
a2de48ca | 2477 | } |
a2de48ca | 2478 | |
f349cf34 | 2479 | if (dev->class) { |
4b30ee58 TH |
2480 | error = sysfs_rename_link_ns(&dev->class->p->subsys.kobj, |
2481 | kobj, old_device_name, | |
2482 | new_name, kobject_namespace(kobj)); | |
f349cf34 EB |
2483 | if (error) |
2484 | goto out; | |
2485 | } | |
39aba963 | 2486 | |
4b30ee58 | 2487 | error = kobject_rename(kobj, new_name); |
1fa5ae85 | 2488 | if (error) |
2ee97caf | 2489 | goto out; |
a2de48ca | 2490 | |
2ee97caf | 2491 | out: |
a2de48ca GKH |
2492 | put_device(dev); |
2493 | ||
2ee97caf | 2494 | kfree(old_device_name); |
a2de48ca GKH |
2495 | |
2496 | return error; | |
2497 | } | |
a2807dbc | 2498 | EXPORT_SYMBOL_GPL(device_rename); |
8a82472f CH |
2499 | |
2500 | static int device_move_class_links(struct device *dev, | |
2501 | struct device *old_parent, | |
2502 | struct device *new_parent) | |
2503 | { | |
f7f3461d | 2504 | int error = 0; |
8a82472f | 2505 | |
f7f3461d GKH |
2506 | if (old_parent) |
2507 | sysfs_remove_link(&dev->kobj, "device"); | |
2508 | if (new_parent) | |
2509 | error = sysfs_create_link(&dev->kobj, &new_parent->kobj, | |
2510 | "device"); | |
2511 | return error; | |
8a82472f CH |
2512 | } |
2513 | ||
2514 | /** | |
2515 | * device_move - moves a device to a new parent | |
2516 | * @dev: the pointer to the struct device to be moved | |
c744aeae | 2517 | * @new_parent: the new parent of the device (can by NULL) |
ffa6a705 | 2518 | * @dpm_order: how to reorder the dpm_list |
8a82472f | 2519 | */ |
ffa6a705 CH |
2520 | int device_move(struct device *dev, struct device *new_parent, |
2521 | enum dpm_order dpm_order) | |
8a82472f CH |
2522 | { |
2523 | int error; | |
2524 | struct device *old_parent; | |
c744aeae | 2525 | struct kobject *new_parent_kobj; |
8a82472f CH |
2526 | |
2527 | dev = get_device(dev); | |
2528 | if (!dev) | |
2529 | return -EINVAL; | |
2530 | ||
ffa6a705 | 2531 | device_pm_lock(); |
8a82472f | 2532 | new_parent = get_device(new_parent); |
4a3ad20c | 2533 | new_parent_kobj = get_device_parent(dev, new_parent); |
63b6971a | 2534 | |
1e0b2cf9 KS |
2535 | pr_debug("device: '%s': %s: moving to '%s'\n", dev_name(dev), |
2536 | __func__, new_parent ? dev_name(new_parent) : "<NULL>"); | |
c744aeae | 2537 | error = kobject_move(&dev->kobj, new_parent_kobj); |
8a82472f | 2538 | if (error) { |
63b6971a | 2539 | cleanup_glue_dir(dev, new_parent_kobj); |
8a82472f CH |
2540 | put_device(new_parent); |
2541 | goto out; | |
2542 | } | |
2543 | old_parent = dev->parent; | |
2544 | dev->parent = new_parent; | |
2545 | if (old_parent) | |
f791b8c8 | 2546 | klist_remove(&dev->p->knode_parent); |
0d358f22 | 2547 | if (new_parent) { |
f791b8c8 GKH |
2548 | klist_add_tail(&dev->p->knode_parent, |
2549 | &new_parent->p->klist_children); | |
0d358f22 YL |
2550 | set_dev_node(dev, dev_to_node(new_parent)); |
2551 | } | |
2552 | ||
bdd4034d RV |
2553 | if (dev->class) { |
2554 | error = device_move_class_links(dev, old_parent, new_parent); | |
2555 | if (error) { | |
2556 | /* We ignore errors on cleanup since we're hosed anyway... */ | |
2557 | device_move_class_links(dev, new_parent, old_parent); | |
2558 | if (!kobject_move(&dev->kobj, &old_parent->kobj)) { | |
2559 | if (new_parent) | |
2560 | klist_remove(&dev->p->knode_parent); | |
2561 | dev->parent = old_parent; | |
2562 | if (old_parent) { | |
2563 | klist_add_tail(&dev->p->knode_parent, | |
2564 | &old_parent->p->klist_children); | |
2565 | set_dev_node(dev, dev_to_node(old_parent)); | |
2566 | } | |
0d358f22 | 2567 | } |
bdd4034d RV |
2568 | cleanup_glue_dir(dev, new_parent_kobj); |
2569 | put_device(new_parent); | |
2570 | goto out; | |
8a82472f | 2571 | } |
8a82472f | 2572 | } |
ffa6a705 CH |
2573 | switch (dpm_order) { |
2574 | case DPM_ORDER_NONE: | |
2575 | break; | |
2576 | case DPM_ORDER_DEV_AFTER_PARENT: | |
2577 | device_pm_move_after(dev, new_parent); | |
52cdbdd4 | 2578 | devices_kset_move_after(dev, new_parent); |
ffa6a705 CH |
2579 | break; |
2580 | case DPM_ORDER_PARENT_BEFORE_DEV: | |
2581 | device_pm_move_before(new_parent, dev); | |
52cdbdd4 | 2582 | devices_kset_move_before(new_parent, dev); |
ffa6a705 CH |
2583 | break; |
2584 | case DPM_ORDER_DEV_LAST: | |
2585 | device_pm_move_last(dev); | |
52cdbdd4 | 2586 | devices_kset_move_last(dev); |
ffa6a705 CH |
2587 | break; |
2588 | } | |
bdd4034d | 2589 | |
8a82472f CH |
2590 | put_device(old_parent); |
2591 | out: | |
ffa6a705 | 2592 | device_pm_unlock(); |
8a82472f CH |
2593 | put_device(dev); |
2594 | return error; | |
2595 | } | |
8a82472f | 2596 | EXPORT_SYMBOL_GPL(device_move); |
37b0c020 GKH |
2597 | |
2598 | /** | |
2599 | * device_shutdown - call ->shutdown() on each device to shutdown. | |
2600 | */ | |
2601 | void device_shutdown(void) | |
2602 | { | |
f123db8e | 2603 | struct device *dev, *parent; |
6245838f HD |
2604 | |
2605 | spin_lock(&devices_kset->list_lock); | |
2606 | /* | |
2607 | * Walk the devices list backward, shutting down each in turn. | |
2608 | * Beware that device unplug events may also start pulling | |
2609 | * devices offline, even as the system is shutting down. | |
2610 | */ | |
2611 | while (!list_empty(&devices_kset->list)) { | |
2612 | dev = list_entry(devices_kset->list.prev, struct device, | |
2613 | kobj.entry); | |
d1c6c030 ML |
2614 | |
2615 | /* | |
2616 | * hold reference count of device's parent to | |
2617 | * prevent it from being freed because parent's | |
2618 | * lock is to be held | |
2619 | */ | |
f123db8e | 2620 | parent = get_device(dev->parent); |
6245838f HD |
2621 | get_device(dev); |
2622 | /* | |
2623 | * Make sure the device is off the kset list, in the | |
2624 | * event that dev->*->shutdown() doesn't remove it. | |
2625 | */ | |
2626 | list_del_init(&dev->kobj.entry); | |
2627 | spin_unlock(&devices_kset->list_lock); | |
fe6b91f4 | 2628 | |
d1c6c030 | 2629 | /* hold lock to avoid race with probe/release */ |
f123db8e BL |
2630 | if (parent) |
2631 | device_lock(parent); | |
d1c6c030 ML |
2632 | device_lock(dev); |
2633 | ||
fe6b91f4 AS |
2634 | /* Don't allow any more runtime suspends */ |
2635 | pm_runtime_get_noresume(dev); | |
2636 | pm_runtime_barrier(dev); | |
37b0c020 | 2637 | |
37b0c020 | 2638 | if (dev->bus && dev->bus->shutdown) { |
0246c4fa SL |
2639 | if (initcall_debug) |
2640 | dev_info(dev, "shutdown\n"); | |
37b0c020 GKH |
2641 | dev->bus->shutdown(dev); |
2642 | } else if (dev->driver && dev->driver->shutdown) { | |
0246c4fa SL |
2643 | if (initcall_debug) |
2644 | dev_info(dev, "shutdown\n"); | |
37b0c020 GKH |
2645 | dev->driver->shutdown(dev); |
2646 | } | |
d1c6c030 ML |
2647 | |
2648 | device_unlock(dev); | |
f123db8e BL |
2649 | if (parent) |
2650 | device_unlock(parent); | |
d1c6c030 | 2651 | |
6245838f | 2652 | put_device(dev); |
f123db8e | 2653 | put_device(parent); |
6245838f HD |
2654 | |
2655 | spin_lock(&devices_kset->list_lock); | |
37b0c020 | 2656 | } |
6245838f | 2657 | spin_unlock(&devices_kset->list_lock); |
37b0c020 | 2658 | } |
99bcf217 JP |
2659 | |
2660 | /* | |
2661 | * Device logging functions | |
2662 | */ | |
2663 | ||
2664 | #ifdef CONFIG_PRINTK | |
666f355f JP |
2665 | static int |
2666 | create_syslog_header(const struct device *dev, char *hdr, size_t hdrlen) | |
99bcf217 | 2667 | { |
c4e00daa | 2668 | const char *subsys; |
798efc60 | 2669 | size_t pos = 0; |
99bcf217 | 2670 | |
c4e00daa KS |
2671 | if (dev->class) |
2672 | subsys = dev->class->name; | |
2673 | else if (dev->bus) | |
2674 | subsys = dev->bus->name; | |
2675 | else | |
798efc60 | 2676 | return 0; |
c4e00daa | 2677 | |
798efc60 | 2678 | pos += snprintf(hdr + pos, hdrlen - pos, "SUBSYSTEM=%s", subsys); |
655e5b7c BH |
2679 | if (pos >= hdrlen) |
2680 | goto overflow; | |
c4e00daa KS |
2681 | |
2682 | /* | |
2683 | * Add device identifier DEVICE=: | |
2684 | * b12:8 block dev_t | |
2685 | * c127:3 char dev_t | |
2686 | * n8 netdev ifindex | |
2687 | * +sound:card0 subsystem:devname | |
2688 | */ | |
2689 | if (MAJOR(dev->devt)) { | |
2690 | char c; | |
2691 | ||
2692 | if (strcmp(subsys, "block") == 0) | |
2693 | c = 'b'; | |
2694 | else | |
2695 | c = 'c'; | |
798efc60 JP |
2696 | pos++; |
2697 | pos += snprintf(hdr + pos, hdrlen - pos, | |
2698 | "DEVICE=%c%u:%u", | |
2699 | c, MAJOR(dev->devt), MINOR(dev->devt)); | |
c4e00daa KS |
2700 | } else if (strcmp(subsys, "net") == 0) { |
2701 | struct net_device *net = to_net_dev(dev); | |
2702 | ||
798efc60 JP |
2703 | pos++; |
2704 | pos += snprintf(hdr + pos, hdrlen - pos, | |
2705 | "DEVICE=n%u", net->ifindex); | |
c4e00daa | 2706 | } else { |
798efc60 JP |
2707 | pos++; |
2708 | pos += snprintf(hdr + pos, hdrlen - pos, | |
2709 | "DEVICE=+%s:%s", subsys, dev_name(dev)); | |
c4e00daa | 2710 | } |
af7f2158 | 2711 | |
655e5b7c BH |
2712 | if (pos >= hdrlen) |
2713 | goto overflow; | |
2714 | ||
798efc60 | 2715 | return pos; |
655e5b7c BH |
2716 | |
2717 | overflow: | |
2718 | dev_WARN(dev, "device/subsystem name too long"); | |
2719 | return 0; | |
798efc60 | 2720 | } |
798efc60 | 2721 | |
05e4e5b8 JP |
2722 | int dev_vprintk_emit(int level, const struct device *dev, |
2723 | const char *fmt, va_list args) | |
2724 | { | |
2725 | char hdr[128]; | |
2726 | size_t hdrlen; | |
2727 | ||
2728 | hdrlen = create_syslog_header(dev, hdr, sizeof(hdr)); | |
2729 | ||
2730 | return vprintk_emit(0, level, hdrlen ? hdr : NULL, hdrlen, fmt, args); | |
2731 | } | |
2732 | EXPORT_SYMBOL(dev_vprintk_emit); | |
2733 | ||
2734 | int dev_printk_emit(int level, const struct device *dev, const char *fmt, ...) | |
2735 | { | |
2736 | va_list args; | |
2737 | int r; | |
2738 | ||
2739 | va_start(args, fmt); | |
2740 | ||
2741 | r = dev_vprintk_emit(level, dev, fmt, args); | |
2742 | ||
2743 | va_end(args); | |
2744 | ||
2745 | return r; | |
2746 | } | |
2747 | EXPORT_SYMBOL(dev_printk_emit); | |
2748 | ||
d1f1052c | 2749 | static void __dev_printk(const char *level, const struct device *dev, |
798efc60 JP |
2750 | struct va_format *vaf) |
2751 | { | |
d1f1052c JP |
2752 | if (dev) |
2753 | dev_printk_emit(level[1] - '0', dev, "%s %s: %pV", | |
2754 | dev_driver_string(dev), dev_name(dev), vaf); | |
2755 | else | |
2756 | printk("%s(NULL device *): %pV", level, vaf); | |
99bcf217 JP |
2757 | } |
2758 | ||
d1f1052c JP |
2759 | void dev_printk(const char *level, const struct device *dev, |
2760 | const char *fmt, ...) | |
99bcf217 JP |
2761 | { |
2762 | struct va_format vaf; | |
2763 | va_list args; | |
99bcf217 JP |
2764 | |
2765 | va_start(args, fmt); | |
2766 | ||
2767 | vaf.fmt = fmt; | |
2768 | vaf.va = &args; | |
2769 | ||
d1f1052c | 2770 | __dev_printk(level, dev, &vaf); |
798efc60 | 2771 | |
99bcf217 | 2772 | va_end(args); |
99bcf217 JP |
2773 | } |
2774 | EXPORT_SYMBOL(dev_printk); | |
2775 | ||
2776 | #define define_dev_printk_level(func, kern_level) \ | |
d1f1052c | 2777 | void func(const struct device *dev, const char *fmt, ...) \ |
99bcf217 JP |
2778 | { \ |
2779 | struct va_format vaf; \ | |
2780 | va_list args; \ | |
99bcf217 JP |
2781 | \ |
2782 | va_start(args, fmt); \ | |
2783 | \ | |
2784 | vaf.fmt = fmt; \ | |
2785 | vaf.va = &args; \ | |
2786 | \ | |
d1f1052c | 2787 | __dev_printk(kern_level, dev, &vaf); \ |
798efc60 | 2788 | \ |
99bcf217 | 2789 | va_end(args); \ |
99bcf217 JP |
2790 | } \ |
2791 | EXPORT_SYMBOL(func); | |
2792 | ||
2793 | define_dev_printk_level(dev_emerg, KERN_EMERG); | |
2794 | define_dev_printk_level(dev_alert, KERN_ALERT); | |
2795 | define_dev_printk_level(dev_crit, KERN_CRIT); | |
2796 | define_dev_printk_level(dev_err, KERN_ERR); | |
2797 | define_dev_printk_level(dev_warn, KERN_WARNING); | |
2798 | define_dev_printk_level(dev_notice, KERN_NOTICE); | |
2799 | define_dev_printk_level(_dev_info, KERN_INFO); | |
2800 | ||
2801 | #endif | |
97badf87 RW |
2802 | |
2803 | static inline bool fwnode_is_primary(struct fwnode_handle *fwnode) | |
2804 | { | |
2805 | return fwnode && !IS_ERR(fwnode->secondary); | |
2806 | } | |
2807 | ||
2808 | /** | |
2809 | * set_primary_fwnode - Change the primary firmware node of a given device. | |
2810 | * @dev: Device to handle. | |
2811 | * @fwnode: New primary firmware node of the device. | |
2812 | * | |
2813 | * Set the device's firmware node pointer to @fwnode, but if a secondary | |
2814 | * firmware node of the device is present, preserve it. | |
2815 | */ | |
2816 | void set_primary_fwnode(struct device *dev, struct fwnode_handle *fwnode) | |
2817 | { | |
2818 | if (fwnode) { | |
2819 | struct fwnode_handle *fn = dev->fwnode; | |
2820 | ||
2821 | if (fwnode_is_primary(fn)) | |
2822 | fn = fn->secondary; | |
2823 | ||
55f89a8a MW |
2824 | if (fn) { |
2825 | WARN_ON(fwnode->secondary); | |
2826 | fwnode->secondary = fn; | |
2827 | } | |
97badf87 RW |
2828 | dev->fwnode = fwnode; |
2829 | } else { | |
2830 | dev->fwnode = fwnode_is_primary(dev->fwnode) ? | |
2831 | dev->fwnode->secondary : NULL; | |
2832 | } | |
2833 | } | |
2834 | EXPORT_SYMBOL_GPL(set_primary_fwnode); | |
2835 | ||
2836 | /** | |
2837 | * set_secondary_fwnode - Change the secondary firmware node of a given device. | |
2838 | * @dev: Device to handle. | |
2839 | * @fwnode: New secondary firmware node of the device. | |
2840 | * | |
2841 | * If a primary firmware node of the device is present, set its secondary | |
2842 | * pointer to @fwnode. Otherwise, set the device's firmware node pointer to | |
2843 | * @fwnode. | |
2844 | */ | |
2845 | void set_secondary_fwnode(struct device *dev, struct fwnode_handle *fwnode) | |
2846 | { | |
2847 | if (fwnode) | |
2848 | fwnode->secondary = ERR_PTR(-ENODEV); | |
2849 | ||
2850 | if (fwnode_is_primary(dev->fwnode)) | |
2851 | dev->fwnode->secondary = fwnode; | |
2852 | else | |
2853 | dev->fwnode = fwnode; | |
2854 | } |