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Commit | Line | Data |
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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 | * | |
21d5c57b RW |
155 | * The caller is responsible for the proper synchronization of the link creation |
156 | * with runtime PM. First, setting the DL_FLAG_PM_RUNTIME flag will cause the | |
157 | * runtime PM framework to take the link into account. Second, if the | |
158 | * DL_FLAG_RPM_ACTIVE flag is set in addition to it, the supplier devices will | |
159 | * be forced into the active metastate and reference-counted upon the creation | |
160 | * of the link. If DL_FLAG_PM_RUNTIME is not set, DL_FLAG_RPM_ACTIVE will be | |
161 | * ignored. | |
162 | * | |
9ed98953 RW |
163 | * If the DL_FLAG_AUTOREMOVE is set, the link will be removed automatically |
164 | * when the consumer device driver unbinds from it. The combination of both | |
165 | * DL_FLAG_AUTOREMOVE and DL_FLAG_STATELESS set is invalid and will cause NULL | |
166 | * to be returned. | |
167 | * | |
168 | * A side effect of the link creation is re-ordering of dpm_list and the | |
169 | * devices_kset list by moving the consumer device and all devices depending | |
170 | * on it to the ends of these lists (that does not happen to devices that have | |
171 | * not been registered when this function is called). | |
172 | * | |
173 | * The supplier device is required to be registered when this function is called | |
174 | * and NULL will be returned if that is not the case. The consumer device need | |
64df1148 | 175 | * not be registered, however. |
9ed98953 RW |
176 | */ |
177 | struct device_link *device_link_add(struct device *consumer, | |
178 | struct device *supplier, u32 flags) | |
179 | { | |
180 | struct device_link *link; | |
181 | ||
182 | if (!consumer || !supplier || | |
183 | ((flags & DL_FLAG_STATELESS) && (flags & DL_FLAG_AUTOREMOVE))) | |
184 | return NULL; | |
185 | ||
186 | device_links_write_lock(); | |
187 | device_pm_lock(); | |
188 | ||
189 | /* | |
190 | * If the supplier has not been fully registered yet or there is a | |
191 | * reverse dependency between the consumer and the supplier already in | |
192 | * the graph, return NULL. | |
193 | */ | |
194 | if (!device_pm_initialized(supplier) | |
195 | || device_is_dependent(consumer, supplier)) { | |
196 | link = NULL; | |
197 | goto out; | |
198 | } | |
199 | ||
200 | list_for_each_entry(link, &supplier->links.consumers, s_node) | |
201 | if (link->consumer == consumer) | |
202 | goto out; | |
203 | ||
21d5c57b | 204 | link = kzalloc(sizeof(*link), GFP_KERNEL); |
9ed98953 RW |
205 | if (!link) |
206 | goto out; | |
207 | ||
baa8809f RW |
208 | if (flags & DL_FLAG_PM_RUNTIME) { |
209 | if (flags & DL_FLAG_RPM_ACTIVE) { | |
210 | if (pm_runtime_get_sync(supplier) < 0) { | |
211 | pm_runtime_put_noidle(supplier); | |
212 | kfree(link); | |
213 | link = NULL; | |
214 | goto out; | |
215 | } | |
216 | link->rpm_active = true; | |
21d5c57b | 217 | } |
baa8809f | 218 | pm_runtime_new_link(consumer); |
21d5c57b | 219 | } |
9ed98953 RW |
220 | get_device(supplier); |
221 | link->supplier = supplier; | |
222 | INIT_LIST_HEAD(&link->s_node); | |
223 | get_device(consumer); | |
224 | link->consumer = consumer; | |
225 | INIT_LIST_HEAD(&link->c_node); | |
226 | link->flags = flags; | |
227 | ||
64df1148 | 228 | /* Determine the initial link state. */ |
9ed98953 RW |
229 | if (flags & DL_FLAG_STATELESS) { |
230 | link->status = DL_STATE_NONE; | |
231 | } else { | |
232 | switch (supplier->links.status) { | |
233 | case DL_DEV_DRIVER_BOUND: | |
234 | switch (consumer->links.status) { | |
235 | case DL_DEV_PROBING: | |
21d5c57b RW |
236 | /* |
237 | * Balance the decrementation of the supplier's | |
238 | * runtime PM usage counter after consumer probe | |
239 | * in driver_probe_device(). | |
240 | */ | |
241 | if (flags & DL_FLAG_PM_RUNTIME) | |
242 | pm_runtime_get_sync(supplier); | |
243 | ||
9ed98953 RW |
244 | link->status = DL_STATE_CONSUMER_PROBE; |
245 | break; | |
246 | case DL_DEV_DRIVER_BOUND: | |
247 | link->status = DL_STATE_ACTIVE; | |
248 | break; | |
249 | default: | |
250 | link->status = DL_STATE_AVAILABLE; | |
251 | break; | |
252 | } | |
253 | break; | |
254 | case DL_DEV_UNBINDING: | |
255 | link->status = DL_STATE_SUPPLIER_UNBIND; | |
256 | break; | |
257 | default: | |
258 | link->status = DL_STATE_DORMANT; | |
259 | break; | |
260 | } | |
261 | } | |
262 | ||
263 | /* | |
264 | * Move the consumer and all of the devices depending on it to the end | |
265 | * of dpm_list and the devices_kset list. | |
266 | * | |
267 | * It is necessary to hold dpm_list locked throughout all that or else | |
268 | * we may end up suspending with a wrong ordering of it. | |
269 | */ | |
270 | device_reorder_to_tail(consumer, NULL); | |
271 | ||
272 | list_add_tail_rcu(&link->s_node, &supplier->links.consumers); | |
273 | list_add_tail_rcu(&link->c_node, &consumer->links.suppliers); | |
274 | ||
275 | dev_info(consumer, "Linked as a consumer to %s\n", dev_name(supplier)); | |
276 | ||
277 | out: | |
278 | device_pm_unlock(); | |
279 | device_links_write_unlock(); | |
280 | return link; | |
281 | } | |
282 | EXPORT_SYMBOL_GPL(device_link_add); | |
283 | ||
284 | static void device_link_free(struct device_link *link) | |
285 | { | |
286 | put_device(link->consumer); | |
287 | put_device(link->supplier); | |
288 | kfree(link); | |
289 | } | |
290 | ||
291 | #ifdef CONFIG_SRCU | |
292 | static void __device_link_free_srcu(struct rcu_head *rhead) | |
293 | { | |
294 | device_link_free(container_of(rhead, struct device_link, rcu_head)); | |
295 | } | |
296 | ||
297 | static void __device_link_del(struct device_link *link) | |
298 | { | |
299 | dev_info(link->consumer, "Dropping the link to %s\n", | |
300 | dev_name(link->supplier)); | |
301 | ||
baa8809f RW |
302 | if (link->flags & DL_FLAG_PM_RUNTIME) |
303 | pm_runtime_drop_link(link->consumer); | |
304 | ||
9ed98953 RW |
305 | list_del_rcu(&link->s_node); |
306 | list_del_rcu(&link->c_node); | |
307 | call_srcu(&device_links_srcu, &link->rcu_head, __device_link_free_srcu); | |
308 | } | |
309 | #else /* !CONFIG_SRCU */ | |
310 | static void __device_link_del(struct device_link *link) | |
311 | { | |
312 | dev_info(link->consumer, "Dropping the link to %s\n", | |
313 | dev_name(link->supplier)); | |
314 | ||
315 | list_del(&link->s_node); | |
316 | list_del(&link->c_node); | |
317 | device_link_free(link); | |
318 | } | |
319 | #endif /* !CONFIG_SRCU */ | |
320 | ||
321 | /** | |
322 | * device_link_del - Delete a link between two devices. | |
323 | * @link: Device link to delete. | |
324 | * | |
325 | * The caller must ensure proper synchronization of this function with runtime | |
326 | * PM. | |
327 | */ | |
328 | void device_link_del(struct device_link *link) | |
329 | { | |
330 | device_links_write_lock(); | |
331 | device_pm_lock(); | |
332 | __device_link_del(link); | |
333 | device_pm_unlock(); | |
334 | device_links_write_unlock(); | |
335 | } | |
336 | EXPORT_SYMBOL_GPL(device_link_del); | |
337 | ||
338 | static void device_links_missing_supplier(struct device *dev) | |
339 | { | |
340 | struct device_link *link; | |
341 | ||
342 | list_for_each_entry(link, &dev->links.suppliers, c_node) | |
343 | if (link->status == DL_STATE_CONSUMER_PROBE) | |
344 | WRITE_ONCE(link->status, DL_STATE_AVAILABLE); | |
345 | } | |
346 | ||
347 | /** | |
348 | * device_links_check_suppliers - Check presence of supplier drivers. | |
349 | * @dev: Consumer device. | |
350 | * | |
351 | * Check links from this device to any suppliers. Walk the list of the device's | |
352 | * links to suppliers and see if all of them are available. If not, simply | |
353 | * return -EPROBE_DEFER. | |
354 | * | |
355 | * We need to guarantee that the supplier will not go away after the check has | |
356 | * been positive here. It only can go away in __device_release_driver() and | |
357 | * that function checks the device's links to consumers. This means we need to | |
358 | * mark the link as "consumer probe in progress" to make the supplier removal | |
359 | * wait for us to complete (or bad things may happen). | |
360 | * | |
361 | * Links with the DL_FLAG_STATELESS flag set are ignored. | |
362 | */ | |
363 | int device_links_check_suppliers(struct device *dev) | |
364 | { | |
365 | struct device_link *link; | |
366 | int ret = 0; | |
367 | ||
368 | device_links_write_lock(); | |
369 | ||
370 | list_for_each_entry(link, &dev->links.suppliers, c_node) { | |
371 | if (link->flags & DL_FLAG_STATELESS) | |
372 | continue; | |
373 | ||
374 | if (link->status != DL_STATE_AVAILABLE) { | |
375 | device_links_missing_supplier(dev); | |
376 | ret = -EPROBE_DEFER; | |
377 | break; | |
378 | } | |
379 | WRITE_ONCE(link->status, DL_STATE_CONSUMER_PROBE); | |
380 | } | |
381 | dev->links.status = DL_DEV_PROBING; | |
382 | ||
383 | device_links_write_unlock(); | |
384 | return ret; | |
385 | } | |
386 | ||
387 | /** | |
388 | * device_links_driver_bound - Update device links after probing its driver. | |
389 | * @dev: Device to update the links for. | |
390 | * | |
391 | * The probe has been successful, so update links from this device to any | |
392 | * consumers by changing their status to "available". | |
393 | * | |
394 | * Also change the status of @dev's links to suppliers to "active". | |
395 | * | |
396 | * Links with the DL_FLAG_STATELESS flag set are ignored. | |
397 | */ | |
398 | void device_links_driver_bound(struct device *dev) | |
399 | { | |
400 | struct device_link *link; | |
401 | ||
402 | device_links_write_lock(); | |
403 | ||
404 | list_for_each_entry(link, &dev->links.consumers, s_node) { | |
405 | if (link->flags & DL_FLAG_STATELESS) | |
406 | continue; | |
407 | ||
408 | WARN_ON(link->status != DL_STATE_DORMANT); | |
409 | WRITE_ONCE(link->status, DL_STATE_AVAILABLE); | |
410 | } | |
411 | ||
412 | list_for_each_entry(link, &dev->links.suppliers, c_node) { | |
413 | if (link->flags & DL_FLAG_STATELESS) | |
414 | continue; | |
415 | ||
416 | WARN_ON(link->status != DL_STATE_CONSUMER_PROBE); | |
417 | WRITE_ONCE(link->status, DL_STATE_ACTIVE); | |
418 | } | |
419 | ||
420 | dev->links.status = DL_DEV_DRIVER_BOUND; | |
421 | ||
422 | device_links_write_unlock(); | |
423 | } | |
424 | ||
425 | /** | |
426 | * __device_links_no_driver - Update links of a device without a driver. | |
427 | * @dev: Device without a drvier. | |
428 | * | |
429 | * Delete all non-persistent links from this device to any suppliers. | |
430 | * | |
431 | * Persistent links stay around, but their status is changed to "available", | |
432 | * unless they already are in the "supplier unbind in progress" state in which | |
433 | * case they need not be updated. | |
434 | * | |
435 | * Links with the DL_FLAG_STATELESS flag set are ignored. | |
436 | */ | |
437 | static void __device_links_no_driver(struct device *dev) | |
438 | { | |
439 | struct device_link *link, *ln; | |
440 | ||
441 | list_for_each_entry_safe_reverse(link, ln, &dev->links.suppliers, c_node) { | |
442 | if (link->flags & DL_FLAG_STATELESS) | |
443 | continue; | |
444 | ||
445 | if (link->flags & DL_FLAG_AUTOREMOVE) | |
446 | __device_link_del(link); | |
447 | else if (link->status != DL_STATE_SUPPLIER_UNBIND) | |
448 | WRITE_ONCE(link->status, DL_STATE_AVAILABLE); | |
449 | } | |
450 | ||
451 | dev->links.status = DL_DEV_NO_DRIVER; | |
452 | } | |
453 | ||
454 | void device_links_no_driver(struct device *dev) | |
455 | { | |
456 | device_links_write_lock(); | |
457 | __device_links_no_driver(dev); | |
458 | device_links_write_unlock(); | |
459 | } | |
460 | ||
461 | /** | |
462 | * device_links_driver_cleanup - Update links after driver removal. | |
463 | * @dev: Device whose driver has just gone away. | |
464 | * | |
465 | * Update links to consumers for @dev by changing their status to "dormant" and | |
466 | * invoke %__device_links_no_driver() to update links to suppliers for it as | |
467 | * appropriate. | |
468 | * | |
469 | * Links with the DL_FLAG_STATELESS flag set are ignored. | |
470 | */ | |
471 | void device_links_driver_cleanup(struct device *dev) | |
472 | { | |
473 | struct device_link *link; | |
474 | ||
475 | device_links_write_lock(); | |
476 | ||
477 | list_for_each_entry(link, &dev->links.consumers, s_node) { | |
478 | if (link->flags & DL_FLAG_STATELESS) | |
479 | continue; | |
480 | ||
481 | WARN_ON(link->flags & DL_FLAG_AUTOREMOVE); | |
482 | WARN_ON(link->status != DL_STATE_SUPPLIER_UNBIND); | |
483 | WRITE_ONCE(link->status, DL_STATE_DORMANT); | |
484 | } | |
485 | ||
486 | __device_links_no_driver(dev); | |
487 | ||
488 | device_links_write_unlock(); | |
489 | } | |
490 | ||
491 | /** | |
492 | * device_links_busy - Check if there are any busy links to consumers. | |
493 | * @dev: Device to check. | |
494 | * | |
495 | * Check each consumer of the device and return 'true' if its link's status | |
496 | * is one of "consumer probe" or "active" (meaning that the given consumer is | |
497 | * probing right now or its driver is present). Otherwise, change the link | |
498 | * state to "supplier unbind" to prevent the consumer from being probed | |
499 | * successfully going forward. | |
500 | * | |
501 | * Return 'false' if there are no probing or active consumers. | |
502 | * | |
503 | * Links with the DL_FLAG_STATELESS flag set are ignored. | |
504 | */ | |
505 | bool device_links_busy(struct device *dev) | |
506 | { | |
507 | struct device_link *link; | |
508 | bool ret = false; | |
509 | ||
510 | device_links_write_lock(); | |
511 | ||
512 | list_for_each_entry(link, &dev->links.consumers, s_node) { | |
513 | if (link->flags & DL_FLAG_STATELESS) | |
514 | continue; | |
515 | ||
516 | if (link->status == DL_STATE_CONSUMER_PROBE | |
517 | || link->status == DL_STATE_ACTIVE) { | |
518 | ret = true; | |
519 | break; | |
520 | } | |
521 | WRITE_ONCE(link->status, DL_STATE_SUPPLIER_UNBIND); | |
522 | } | |
523 | ||
524 | dev->links.status = DL_DEV_UNBINDING; | |
525 | ||
526 | device_links_write_unlock(); | |
527 | return ret; | |
528 | } | |
529 | ||
530 | /** | |
531 | * device_links_unbind_consumers - Force unbind consumers of the given device. | |
532 | * @dev: Device to unbind the consumers of. | |
533 | * | |
534 | * Walk the list of links to consumers for @dev and if any of them is in the | |
535 | * "consumer probe" state, wait for all device probes in progress to complete | |
536 | * and start over. | |
537 | * | |
538 | * If that's not the case, change the status of the link to "supplier unbind" | |
539 | * and check if the link was in the "active" state. If so, force the consumer | |
540 | * driver to unbind and start over (the consumer will not re-probe as we have | |
541 | * changed the state of the link already). | |
542 | * | |
543 | * Links with the DL_FLAG_STATELESS flag set are ignored. | |
544 | */ | |
545 | void device_links_unbind_consumers(struct device *dev) | |
546 | { | |
547 | struct device_link *link; | |
548 | ||
549 | start: | |
550 | device_links_write_lock(); | |
551 | ||
552 | list_for_each_entry(link, &dev->links.consumers, s_node) { | |
553 | enum device_link_state status; | |
554 | ||
555 | if (link->flags & DL_FLAG_STATELESS) | |
556 | continue; | |
557 | ||
558 | status = link->status; | |
559 | if (status == DL_STATE_CONSUMER_PROBE) { | |
560 | device_links_write_unlock(); | |
561 | ||
562 | wait_for_device_probe(); | |
563 | goto start; | |
564 | } | |
565 | WRITE_ONCE(link->status, DL_STATE_SUPPLIER_UNBIND); | |
566 | if (status == DL_STATE_ACTIVE) { | |
567 | struct device *consumer = link->consumer; | |
568 | ||
569 | get_device(consumer); | |
570 | ||
571 | device_links_write_unlock(); | |
572 | ||
573 | device_release_driver_internal(consumer, NULL, | |
574 | consumer->parent); | |
575 | put_device(consumer); | |
576 | goto start; | |
577 | } | |
578 | } | |
579 | ||
580 | device_links_write_unlock(); | |
581 | } | |
582 | ||
583 | /** | |
584 | * device_links_purge - Delete existing links to other devices. | |
585 | * @dev: Target device. | |
586 | */ | |
587 | static void device_links_purge(struct device *dev) | |
588 | { | |
589 | struct device_link *link, *ln; | |
590 | ||
591 | /* | |
592 | * Delete all of the remaining links from this device to any other | |
593 | * devices (either consumers or suppliers). | |
594 | */ | |
595 | device_links_write_lock(); | |
596 | ||
597 | list_for_each_entry_safe_reverse(link, ln, &dev->links.suppliers, c_node) { | |
598 | WARN_ON(link->status == DL_STATE_ACTIVE); | |
599 | __device_link_del(link); | |
600 | } | |
601 | ||
602 | list_for_each_entry_safe_reverse(link, ln, &dev->links.consumers, s_node) { | |
603 | WARN_ON(link->status != DL_STATE_DORMANT && | |
604 | link->status != DL_STATE_NONE); | |
605 | __device_link_del(link); | |
606 | } | |
607 | ||
608 | device_links_write_unlock(); | |
609 | } | |
610 | ||
611 | /* Device links support end. */ | |
612 | ||
4a3ad20c GKH |
613 | int (*platform_notify)(struct device *dev) = NULL; |
614 | int (*platform_notify_remove)(struct device *dev) = NULL; | |
e105b8bf DW |
615 | static struct kobject *dev_kobj; |
616 | struct kobject *sysfs_dev_char_kobj; | |
617 | struct kobject *sysfs_dev_block_kobj; | |
1da177e4 | 618 | |
5e33bc41 RW |
619 | static DEFINE_MUTEX(device_hotplug_lock); |
620 | ||
621 | void lock_device_hotplug(void) | |
622 | { | |
623 | mutex_lock(&device_hotplug_lock); | |
624 | } | |
625 | ||
626 | void unlock_device_hotplug(void) | |
627 | { | |
628 | mutex_unlock(&device_hotplug_lock); | |
629 | } | |
630 | ||
631 | int lock_device_hotplug_sysfs(void) | |
632 | { | |
633 | if (mutex_trylock(&device_hotplug_lock)) | |
634 | return 0; | |
635 | ||
636 | /* Avoid busy looping (5 ms of sleep should do). */ | |
637 | msleep(5); | |
638 | return restart_syscall(); | |
639 | } | |
640 | ||
4e886c29 GKH |
641 | #ifdef CONFIG_BLOCK |
642 | static inline int device_is_not_partition(struct device *dev) | |
643 | { | |
644 | return !(dev->type == &part_type); | |
645 | } | |
646 | #else | |
647 | static inline int device_is_not_partition(struct device *dev) | |
648 | { | |
649 | return 1; | |
650 | } | |
651 | #endif | |
1da177e4 | 652 | |
3e95637a AS |
653 | /** |
654 | * dev_driver_string - Return a device's driver name, if at all possible | |
655 | * @dev: struct device to get the name of | |
656 | * | |
657 | * Will return the device's driver's name if it is bound to a device. If | |
9169c012 | 658 | * the device is not bound to a driver, it will return the name of the bus |
3e95637a AS |
659 | * it is attached to. If it is not attached to a bus either, an empty |
660 | * string will be returned. | |
661 | */ | |
bf9ca69f | 662 | const char *dev_driver_string(const struct device *dev) |
3e95637a | 663 | { |
3589972e AS |
664 | struct device_driver *drv; |
665 | ||
666 | /* dev->driver can change to NULL underneath us because of unbinding, | |
667 | * so be careful about accessing it. dev->bus and dev->class should | |
668 | * never change once they are set, so they don't need special care. | |
669 | */ | |
670 | drv = ACCESS_ONCE(dev->driver); | |
671 | return drv ? drv->name : | |
a456b702 JD |
672 | (dev->bus ? dev->bus->name : |
673 | (dev->class ? dev->class->name : "")); | |
3e95637a | 674 | } |
310a922d | 675 | EXPORT_SYMBOL(dev_driver_string); |
3e95637a | 676 | |
1da177e4 LT |
677 | #define to_dev_attr(_attr) container_of(_attr, struct device_attribute, attr) |
678 | ||
4a3ad20c GKH |
679 | static ssize_t dev_attr_show(struct kobject *kobj, struct attribute *attr, |
680 | char *buf) | |
1da177e4 | 681 | { |
4a3ad20c | 682 | struct device_attribute *dev_attr = to_dev_attr(attr); |
b0d1f807 | 683 | struct device *dev = kobj_to_dev(kobj); |
4a0c20bf | 684 | ssize_t ret = -EIO; |
1da177e4 LT |
685 | |
686 | if (dev_attr->show) | |
54b6f35c | 687 | ret = dev_attr->show(dev, dev_attr, buf); |
815d2d50 | 688 | if (ret >= (ssize_t)PAGE_SIZE) { |
53a9c87e GKH |
689 | print_symbol("dev_attr_show: %s returned bad count\n", |
690 | (unsigned long)dev_attr->show); | |
815d2d50 | 691 | } |
1da177e4 LT |
692 | return ret; |
693 | } | |
694 | ||
4a3ad20c GKH |
695 | static ssize_t dev_attr_store(struct kobject *kobj, struct attribute *attr, |
696 | const char *buf, size_t count) | |
1da177e4 | 697 | { |
4a3ad20c | 698 | struct device_attribute *dev_attr = to_dev_attr(attr); |
b0d1f807 | 699 | struct device *dev = kobj_to_dev(kobj); |
4a0c20bf | 700 | ssize_t ret = -EIO; |
1da177e4 LT |
701 | |
702 | if (dev_attr->store) | |
54b6f35c | 703 | ret = dev_attr->store(dev, dev_attr, buf, count); |
1da177e4 LT |
704 | return ret; |
705 | } | |
706 | ||
52cf25d0 | 707 | static const struct sysfs_ops dev_sysfs_ops = { |
1da177e4 LT |
708 | .show = dev_attr_show, |
709 | .store = dev_attr_store, | |
710 | }; | |
711 | ||
ca22e56d KS |
712 | #define to_ext_attr(x) container_of(x, struct dev_ext_attribute, attr) |
713 | ||
714 | ssize_t device_store_ulong(struct device *dev, | |
715 | struct device_attribute *attr, | |
716 | const char *buf, size_t size) | |
717 | { | |
718 | struct dev_ext_attribute *ea = to_ext_attr(attr); | |
719 | char *end; | |
720 | unsigned long new = simple_strtoul(buf, &end, 0); | |
721 | if (end == buf) | |
722 | return -EINVAL; | |
723 | *(unsigned long *)(ea->var) = new; | |
724 | /* Always return full write size even if we didn't consume all */ | |
725 | return size; | |
726 | } | |
727 | EXPORT_SYMBOL_GPL(device_store_ulong); | |
728 | ||
729 | ssize_t device_show_ulong(struct device *dev, | |
730 | struct device_attribute *attr, | |
731 | char *buf) | |
732 | { | |
733 | struct dev_ext_attribute *ea = to_ext_attr(attr); | |
734 | return snprintf(buf, PAGE_SIZE, "%lx\n", *(unsigned long *)(ea->var)); | |
735 | } | |
736 | EXPORT_SYMBOL_GPL(device_show_ulong); | |
737 | ||
738 | ssize_t device_store_int(struct device *dev, | |
739 | struct device_attribute *attr, | |
740 | const char *buf, size_t size) | |
741 | { | |
742 | struct dev_ext_attribute *ea = to_ext_attr(attr); | |
743 | char *end; | |
744 | long new = simple_strtol(buf, &end, 0); | |
745 | if (end == buf || new > INT_MAX || new < INT_MIN) | |
746 | return -EINVAL; | |
747 | *(int *)(ea->var) = new; | |
748 | /* Always return full write size even if we didn't consume all */ | |
749 | return size; | |
750 | } | |
751 | EXPORT_SYMBOL_GPL(device_store_int); | |
752 | ||
753 | ssize_t device_show_int(struct device *dev, | |
754 | struct device_attribute *attr, | |
755 | char *buf) | |
756 | { | |
757 | struct dev_ext_attribute *ea = to_ext_attr(attr); | |
758 | ||
759 | return snprintf(buf, PAGE_SIZE, "%d\n", *(int *)(ea->var)); | |
760 | } | |
761 | EXPORT_SYMBOL_GPL(device_show_int); | |
1da177e4 | 762 | |
91872392 BP |
763 | ssize_t device_store_bool(struct device *dev, struct device_attribute *attr, |
764 | const char *buf, size_t size) | |
765 | { | |
766 | struct dev_ext_attribute *ea = to_ext_attr(attr); | |
767 | ||
768 | if (strtobool(buf, ea->var) < 0) | |
769 | return -EINVAL; | |
770 | ||
771 | return size; | |
772 | } | |
773 | EXPORT_SYMBOL_GPL(device_store_bool); | |
774 | ||
775 | ssize_t device_show_bool(struct device *dev, struct device_attribute *attr, | |
776 | char *buf) | |
777 | { | |
778 | struct dev_ext_attribute *ea = to_ext_attr(attr); | |
779 | ||
780 | return snprintf(buf, PAGE_SIZE, "%d\n", *(bool *)(ea->var)); | |
781 | } | |
782 | EXPORT_SYMBOL_GPL(device_show_bool); | |
783 | ||
1da177e4 | 784 | /** |
f8878dcb RD |
785 | * device_release - free device structure. |
786 | * @kobj: device's kobject. | |
1da177e4 | 787 | * |
f8878dcb RD |
788 | * This is called once the reference count for the object |
789 | * reaches 0. We forward the call to the device's release | |
790 | * method, which should handle actually freeing the structure. | |
1da177e4 | 791 | */ |
4a3ad20c | 792 | static void device_release(struct kobject *kobj) |
1da177e4 | 793 | { |
b0d1f807 | 794 | struct device *dev = kobj_to_dev(kobj); |
fb069a5d | 795 | struct device_private *p = dev->p; |
1da177e4 | 796 | |
a525a3dd ML |
797 | /* |
798 | * Some platform devices are driven without driver attached | |
799 | * and managed resources may have been acquired. Make sure | |
800 | * all resources are released. | |
801 | * | |
802 | * Drivers still can add resources into device after device | |
803 | * is deleted but alive, so release devres here to avoid | |
804 | * possible memory leak. | |
805 | */ | |
806 | devres_release_all(dev); | |
807 | ||
1da177e4 LT |
808 | if (dev->release) |
809 | dev->release(dev); | |
f9f852df KS |
810 | else if (dev->type && dev->type->release) |
811 | dev->type->release(dev); | |
2620efef GKH |
812 | else if (dev->class && dev->class->dev_release) |
813 | dev->class->dev_release(dev); | |
f810a5cf AV |
814 | else |
815 | WARN(1, KERN_ERR "Device '%s' does not have a release() " | |
4a3ad20c | 816 | "function, it is broken and must be fixed.\n", |
1e0b2cf9 | 817 | dev_name(dev)); |
fb069a5d | 818 | kfree(p); |
1da177e4 LT |
819 | } |
820 | ||
bc451f20 EB |
821 | static const void *device_namespace(struct kobject *kobj) |
822 | { | |
b0d1f807 | 823 | struct device *dev = kobj_to_dev(kobj); |
bc451f20 EB |
824 | const void *ns = NULL; |
825 | ||
826 | if (dev->class && dev->class->ns_type) | |
827 | ns = dev->class->namespace(dev); | |
828 | ||
829 | return ns; | |
830 | } | |
831 | ||
8f4afc41 | 832 | static struct kobj_type device_ktype = { |
1da177e4 LT |
833 | .release = device_release, |
834 | .sysfs_ops = &dev_sysfs_ops, | |
bc451f20 | 835 | .namespace = device_namespace, |
1da177e4 LT |
836 | }; |
837 | ||
838 | ||
312c004d | 839 | static int dev_uevent_filter(struct kset *kset, struct kobject *kobj) |
1da177e4 LT |
840 | { |
841 | struct kobj_type *ktype = get_ktype(kobj); | |
842 | ||
8f4afc41 | 843 | if (ktype == &device_ktype) { |
b0d1f807 | 844 | struct device *dev = kobj_to_dev(kobj); |
1da177e4 LT |
845 | if (dev->bus) |
846 | return 1; | |
23681e47 GKH |
847 | if (dev->class) |
848 | return 1; | |
1da177e4 LT |
849 | } |
850 | return 0; | |
851 | } | |
852 | ||
312c004d | 853 | static const char *dev_uevent_name(struct kset *kset, struct kobject *kobj) |
1da177e4 | 854 | { |
b0d1f807 | 855 | struct device *dev = kobj_to_dev(kobj); |
1da177e4 | 856 | |
23681e47 GKH |
857 | if (dev->bus) |
858 | return dev->bus->name; | |
859 | if (dev->class) | |
860 | return dev->class->name; | |
861 | return NULL; | |
1da177e4 LT |
862 | } |
863 | ||
7eff2e7a KS |
864 | static int dev_uevent(struct kset *kset, struct kobject *kobj, |
865 | struct kobj_uevent_env *env) | |
1da177e4 | 866 | { |
b0d1f807 | 867 | struct device *dev = kobj_to_dev(kobj); |
1da177e4 LT |
868 | int retval = 0; |
869 | ||
6fcf53ac | 870 | /* add device node properties if present */ |
23681e47 | 871 | if (MAJOR(dev->devt)) { |
6fcf53ac KS |
872 | const char *tmp; |
873 | const char *name; | |
2c9ede55 | 874 | umode_t mode = 0; |
4e4098a3 GKH |
875 | kuid_t uid = GLOBAL_ROOT_UID; |
876 | kgid_t gid = GLOBAL_ROOT_GID; | |
6fcf53ac | 877 | |
7eff2e7a KS |
878 | add_uevent_var(env, "MAJOR=%u", MAJOR(dev->devt)); |
879 | add_uevent_var(env, "MINOR=%u", MINOR(dev->devt)); | |
3c2670e6 | 880 | name = device_get_devnode(dev, &mode, &uid, &gid, &tmp); |
6fcf53ac KS |
881 | if (name) { |
882 | add_uevent_var(env, "DEVNAME=%s", name); | |
e454cea2 KS |
883 | if (mode) |
884 | add_uevent_var(env, "DEVMODE=%#o", mode & 0777); | |
4e4098a3 GKH |
885 | if (!uid_eq(uid, GLOBAL_ROOT_UID)) |
886 | add_uevent_var(env, "DEVUID=%u", from_kuid(&init_user_ns, uid)); | |
887 | if (!gid_eq(gid, GLOBAL_ROOT_GID)) | |
888 | add_uevent_var(env, "DEVGID=%u", from_kgid(&init_user_ns, gid)); | |
3c2670e6 | 889 | kfree(tmp); |
6fcf53ac | 890 | } |
23681e47 GKH |
891 | } |
892 | ||
414264f9 | 893 | if (dev->type && dev->type->name) |
7eff2e7a | 894 | add_uevent_var(env, "DEVTYPE=%s", dev->type->name); |
414264f9 | 895 | |
239378f1 | 896 | if (dev->driver) |
7eff2e7a | 897 | add_uevent_var(env, "DRIVER=%s", dev->driver->name); |
239378f1 | 898 | |
07d57a32 GL |
899 | /* Add common DT information about the device */ |
900 | of_device_uevent(dev, env); | |
901 | ||
7eff2e7a | 902 | /* have the bus specific function add its stuff */ |
312c004d | 903 | if (dev->bus && dev->bus->uevent) { |
7eff2e7a | 904 | retval = dev->bus->uevent(dev, env); |
f9f852df | 905 | if (retval) |
7dc72b28 | 906 | pr_debug("device: '%s': %s: bus uevent() returned %d\n", |
1e0b2cf9 | 907 | dev_name(dev), __func__, retval); |
1da177e4 LT |
908 | } |
909 | ||
7eff2e7a | 910 | /* have the class specific function add its stuff */ |
2620efef | 911 | if (dev->class && dev->class->dev_uevent) { |
7eff2e7a | 912 | retval = dev->class->dev_uevent(dev, env); |
f9f852df | 913 | if (retval) |
7dc72b28 | 914 | pr_debug("device: '%s': %s: class uevent() " |
1e0b2cf9 | 915 | "returned %d\n", dev_name(dev), |
2b3a302a | 916 | __func__, retval); |
f9f852df KS |
917 | } |
918 | ||
eef35c2d | 919 | /* have the device type specific function add its stuff */ |
f9f852df | 920 | if (dev->type && dev->type->uevent) { |
7eff2e7a | 921 | retval = dev->type->uevent(dev, env); |
f9f852df | 922 | if (retval) |
7dc72b28 | 923 | pr_debug("device: '%s': %s: dev_type uevent() " |
1e0b2cf9 | 924 | "returned %d\n", dev_name(dev), |
2b3a302a | 925 | __func__, retval); |
2620efef GKH |
926 | } |
927 | ||
1da177e4 LT |
928 | return retval; |
929 | } | |
930 | ||
9cd43611 | 931 | static const struct kset_uevent_ops device_uevent_ops = { |
312c004d KS |
932 | .filter = dev_uevent_filter, |
933 | .name = dev_uevent_name, | |
934 | .uevent = dev_uevent, | |
1da177e4 LT |
935 | }; |
936 | ||
c5e064a6 | 937 | static ssize_t uevent_show(struct device *dev, struct device_attribute *attr, |
16574dcc KS |
938 | char *buf) |
939 | { | |
940 | struct kobject *top_kobj; | |
941 | struct kset *kset; | |
7eff2e7a | 942 | struct kobj_uevent_env *env = NULL; |
16574dcc KS |
943 | int i; |
944 | size_t count = 0; | |
945 | int retval; | |
946 | ||
947 | /* search the kset, the device belongs to */ | |
948 | top_kobj = &dev->kobj; | |
5c5daf65 KS |
949 | while (!top_kobj->kset && top_kobj->parent) |
950 | top_kobj = top_kobj->parent; | |
16574dcc KS |
951 | if (!top_kobj->kset) |
952 | goto out; | |
5c5daf65 | 953 | |
16574dcc KS |
954 | kset = top_kobj->kset; |
955 | if (!kset->uevent_ops || !kset->uevent_ops->uevent) | |
956 | goto out; | |
957 | ||
958 | /* respect filter */ | |
959 | if (kset->uevent_ops && kset->uevent_ops->filter) | |
960 | if (!kset->uevent_ops->filter(kset, &dev->kobj)) | |
961 | goto out; | |
962 | ||
7eff2e7a KS |
963 | env = kzalloc(sizeof(struct kobj_uevent_env), GFP_KERNEL); |
964 | if (!env) | |
c7308c81 GKH |
965 | return -ENOMEM; |
966 | ||
16574dcc | 967 | /* let the kset specific function add its keys */ |
7eff2e7a | 968 | retval = kset->uevent_ops->uevent(kset, &dev->kobj, env); |
16574dcc KS |
969 | if (retval) |
970 | goto out; | |
971 | ||
972 | /* copy keys to file */ | |
7eff2e7a KS |
973 | for (i = 0; i < env->envp_idx; i++) |
974 | count += sprintf(&buf[count], "%s\n", env->envp[i]); | |
16574dcc | 975 | out: |
7eff2e7a | 976 | kfree(env); |
16574dcc KS |
977 | return count; |
978 | } | |
979 | ||
c5e064a6 | 980 | static ssize_t uevent_store(struct device *dev, struct device_attribute *attr, |
a7fd6706 KS |
981 | const char *buf, size_t count) |
982 | { | |
60a96a59 KS |
983 | enum kobject_action action; |
984 | ||
3f5468c9 | 985 | if (kobject_action_type(buf, count, &action) == 0) |
60a96a59 | 986 | kobject_uevent(&dev->kobj, action); |
3f5468c9 KS |
987 | else |
988 | dev_err(dev, "uevent: unknown action-string\n"); | |
a7fd6706 KS |
989 | return count; |
990 | } | |
c5e064a6 | 991 | static DEVICE_ATTR_RW(uevent); |
a7fd6706 | 992 | |
c5e064a6 | 993 | static ssize_t online_show(struct device *dev, struct device_attribute *attr, |
4f3549d7 RW |
994 | char *buf) |
995 | { | |
996 | bool val; | |
997 | ||
5e33bc41 | 998 | device_lock(dev); |
4f3549d7 | 999 | val = !dev->offline; |
5e33bc41 | 1000 | device_unlock(dev); |
4f3549d7 RW |
1001 | return sprintf(buf, "%u\n", val); |
1002 | } | |
1003 | ||
c5e064a6 | 1004 | static ssize_t online_store(struct device *dev, struct device_attribute *attr, |
4f3549d7 RW |
1005 | const char *buf, size_t count) |
1006 | { | |
1007 | bool val; | |
1008 | int ret; | |
1009 | ||
1010 | ret = strtobool(buf, &val); | |
1011 | if (ret < 0) | |
1012 | return ret; | |
1013 | ||
5e33bc41 RW |
1014 | ret = lock_device_hotplug_sysfs(); |
1015 | if (ret) | |
1016 | return ret; | |
1017 | ||
4f3549d7 RW |
1018 | ret = val ? device_online(dev) : device_offline(dev); |
1019 | unlock_device_hotplug(); | |
1020 | return ret < 0 ? ret : count; | |
1021 | } | |
c5e064a6 | 1022 | static DEVICE_ATTR_RW(online); |
4f3549d7 | 1023 | |
fa6fdb33 | 1024 | int device_add_groups(struct device *dev, const struct attribute_group **groups) |
621a1672 | 1025 | { |
3e9b2bae | 1026 | return sysfs_create_groups(&dev->kobj, groups); |
de0ff00d GKH |
1027 | } |
1028 | ||
fa6fdb33 GKH |
1029 | void device_remove_groups(struct device *dev, |
1030 | const struct attribute_group **groups) | |
de0ff00d | 1031 | { |
3e9b2bae | 1032 | sysfs_remove_groups(&dev->kobj, groups); |
de0ff00d GKH |
1033 | } |
1034 | ||
2620efef GKH |
1035 | static int device_add_attrs(struct device *dev) |
1036 | { | |
1037 | struct class *class = dev->class; | |
aed65af1 | 1038 | const struct device_type *type = dev->type; |
621a1672 | 1039 | int error; |
2620efef | 1040 | |
621a1672 | 1041 | if (class) { |
d05a6f96 | 1042 | error = device_add_groups(dev, class->dev_groups); |
f9f852df | 1043 | if (error) |
621a1672 | 1044 | return error; |
2620efef | 1045 | } |
f9f852df | 1046 | |
621a1672 DT |
1047 | if (type) { |
1048 | error = device_add_groups(dev, type->groups); | |
f9f852df | 1049 | if (error) |
a6b01ded | 1050 | goto err_remove_class_groups; |
f9f852df KS |
1051 | } |
1052 | ||
621a1672 DT |
1053 | error = device_add_groups(dev, dev->groups); |
1054 | if (error) | |
1055 | goto err_remove_type_groups; | |
1056 | ||
4f3549d7 | 1057 | if (device_supports_offline(dev) && !dev->offline_disabled) { |
c5e064a6 | 1058 | error = device_create_file(dev, &dev_attr_online); |
4f3549d7 | 1059 | if (error) |
ecfbf6fd | 1060 | goto err_remove_dev_groups; |
4f3549d7 RW |
1061 | } |
1062 | ||
6751667a BH |
1063 | error = device_create_file(dev, &dev_attr_deferred_probe); |
1064 | if (error) | |
1065 | goto err_remove_online; | |
1066 | ||
621a1672 DT |
1067 | return 0; |
1068 | ||
6751667a BH |
1069 | err_remove_online: |
1070 | device_remove_file(dev, &dev_attr_online); | |
ecfbf6fd RW |
1071 | err_remove_dev_groups: |
1072 | device_remove_groups(dev, dev->groups); | |
621a1672 DT |
1073 | err_remove_type_groups: |
1074 | if (type) | |
1075 | device_remove_groups(dev, type->groups); | |
d05a6f96 GKH |
1076 | err_remove_class_groups: |
1077 | if (class) | |
1078 | device_remove_groups(dev, class->dev_groups); | |
621a1672 | 1079 | |
2620efef GKH |
1080 | return error; |
1081 | } | |
1082 | ||
1083 | static void device_remove_attrs(struct device *dev) | |
1084 | { | |
1085 | struct class *class = dev->class; | |
aed65af1 | 1086 | const struct device_type *type = dev->type; |
2620efef | 1087 | |
6751667a | 1088 | device_remove_file(dev, &dev_attr_deferred_probe); |
c5e064a6 | 1089 | device_remove_file(dev, &dev_attr_online); |
621a1672 | 1090 | device_remove_groups(dev, dev->groups); |
f9f852df | 1091 | |
621a1672 DT |
1092 | if (type) |
1093 | device_remove_groups(dev, type->groups); | |
1094 | ||
a6b01ded | 1095 | if (class) |
d05a6f96 | 1096 | device_remove_groups(dev, class->dev_groups); |
2620efef GKH |
1097 | } |
1098 | ||
c5e064a6 | 1099 | static ssize_t dev_show(struct device *dev, struct device_attribute *attr, |
23681e47 GKH |
1100 | char *buf) |
1101 | { | |
1102 | return print_dev_t(buf, dev->devt); | |
1103 | } | |
c5e064a6 | 1104 | static DEVICE_ATTR_RO(dev); |
ad6a1e1c | 1105 | |
ca22e56d | 1106 | /* /sys/devices/ */ |
881c6cfd | 1107 | struct kset *devices_kset; |
1da177e4 | 1108 | |
52cdbdd4 GS |
1109 | /** |
1110 | * devices_kset_move_before - Move device in the devices_kset's list. | |
1111 | * @deva: Device to move. | |
1112 | * @devb: Device @deva should come before. | |
1113 | */ | |
1114 | static void devices_kset_move_before(struct device *deva, struct device *devb) | |
1115 | { | |
1116 | if (!devices_kset) | |
1117 | return; | |
1118 | pr_debug("devices_kset: Moving %s before %s\n", | |
1119 | dev_name(deva), dev_name(devb)); | |
1120 | spin_lock(&devices_kset->list_lock); | |
1121 | list_move_tail(&deva->kobj.entry, &devb->kobj.entry); | |
1122 | spin_unlock(&devices_kset->list_lock); | |
1123 | } | |
1124 | ||
1125 | /** | |
1126 | * devices_kset_move_after - Move device in the devices_kset's list. | |
1127 | * @deva: Device to move | |
1128 | * @devb: Device @deva should come after. | |
1129 | */ | |
1130 | static void devices_kset_move_after(struct device *deva, struct device *devb) | |
1131 | { | |
1132 | if (!devices_kset) | |
1133 | return; | |
1134 | pr_debug("devices_kset: Moving %s after %s\n", | |
1135 | dev_name(deva), dev_name(devb)); | |
1136 | spin_lock(&devices_kset->list_lock); | |
1137 | list_move(&deva->kobj.entry, &devb->kobj.entry); | |
1138 | spin_unlock(&devices_kset->list_lock); | |
1139 | } | |
1140 | ||
1141 | /** | |
1142 | * devices_kset_move_last - move the device to the end of devices_kset's list. | |
1143 | * @dev: device to move | |
1144 | */ | |
1145 | void devices_kset_move_last(struct device *dev) | |
1146 | { | |
1147 | if (!devices_kset) | |
1148 | return; | |
1149 | pr_debug("devices_kset: Moving %s to end of list\n", dev_name(dev)); | |
1150 | spin_lock(&devices_kset->list_lock); | |
1151 | list_move_tail(&dev->kobj.entry, &devices_kset->list); | |
1152 | spin_unlock(&devices_kset->list_lock); | |
1153 | } | |
1154 | ||
1da177e4 | 1155 | /** |
4a3ad20c GKH |
1156 | * device_create_file - create sysfs attribute file for device. |
1157 | * @dev: device. | |
1158 | * @attr: device attribute descriptor. | |
1da177e4 | 1159 | */ |
26579ab7 PC |
1160 | int device_create_file(struct device *dev, |
1161 | const struct device_attribute *attr) | |
1da177e4 LT |
1162 | { |
1163 | int error = 0; | |
8f46baaa FB |
1164 | |
1165 | if (dev) { | |
1166 | WARN(((attr->attr.mode & S_IWUGO) && !attr->store), | |
97521978 | 1167 | "Attribute %s: write permission without 'store'\n", |
1168 | attr->attr.name); | |
8f46baaa | 1169 | WARN(((attr->attr.mode & S_IRUGO) && !attr->show), |
97521978 | 1170 | "Attribute %s: read permission without 'show'\n", |
1171 | attr->attr.name); | |
1da177e4 | 1172 | error = sysfs_create_file(&dev->kobj, &attr->attr); |
8f46baaa FB |
1173 | } |
1174 | ||
1da177e4 LT |
1175 | return error; |
1176 | } | |
86df2687 | 1177 | EXPORT_SYMBOL_GPL(device_create_file); |
1da177e4 LT |
1178 | |
1179 | /** | |
4a3ad20c GKH |
1180 | * device_remove_file - remove sysfs attribute file. |
1181 | * @dev: device. | |
1182 | * @attr: device attribute descriptor. | |
1da177e4 | 1183 | */ |
26579ab7 PC |
1184 | void device_remove_file(struct device *dev, |
1185 | const struct device_attribute *attr) | |
1da177e4 | 1186 | { |
0c98b19f | 1187 | if (dev) |
1da177e4 | 1188 | sysfs_remove_file(&dev->kobj, &attr->attr); |
1da177e4 | 1189 | } |
86df2687 | 1190 | EXPORT_SYMBOL_GPL(device_remove_file); |
1da177e4 | 1191 | |
6b0afc2a TH |
1192 | /** |
1193 | * device_remove_file_self - remove sysfs attribute file from its own method. | |
1194 | * @dev: device. | |
1195 | * @attr: device attribute descriptor. | |
1196 | * | |
1197 | * See kernfs_remove_self() for details. | |
1198 | */ | |
1199 | bool device_remove_file_self(struct device *dev, | |
1200 | const struct device_attribute *attr) | |
1201 | { | |
1202 | if (dev) | |
1203 | return sysfs_remove_file_self(&dev->kobj, &attr->attr); | |
1204 | else | |
1205 | return false; | |
1206 | } | |
1207 | EXPORT_SYMBOL_GPL(device_remove_file_self); | |
1208 | ||
2589f188 GKH |
1209 | /** |
1210 | * device_create_bin_file - create sysfs binary attribute file for device. | |
1211 | * @dev: device. | |
1212 | * @attr: device binary attribute descriptor. | |
1213 | */ | |
66ecb92b PC |
1214 | int device_create_bin_file(struct device *dev, |
1215 | const struct bin_attribute *attr) | |
2589f188 GKH |
1216 | { |
1217 | int error = -EINVAL; | |
1218 | if (dev) | |
1219 | error = sysfs_create_bin_file(&dev->kobj, attr); | |
1220 | return error; | |
1221 | } | |
1222 | EXPORT_SYMBOL_GPL(device_create_bin_file); | |
1223 | ||
1224 | /** | |
1225 | * device_remove_bin_file - remove sysfs binary attribute file | |
1226 | * @dev: device. | |
1227 | * @attr: device binary attribute descriptor. | |
1228 | */ | |
66ecb92b PC |
1229 | void device_remove_bin_file(struct device *dev, |
1230 | const struct bin_attribute *attr) | |
2589f188 GKH |
1231 | { |
1232 | if (dev) | |
1233 | sysfs_remove_bin_file(&dev->kobj, attr); | |
1234 | } | |
1235 | EXPORT_SYMBOL_GPL(device_remove_bin_file); | |
1236 | ||
34bb61f9 JB |
1237 | static void klist_children_get(struct klist_node *n) |
1238 | { | |
f791b8c8 GKH |
1239 | struct device_private *p = to_device_private_parent(n); |
1240 | struct device *dev = p->device; | |
34bb61f9 JB |
1241 | |
1242 | get_device(dev); | |
1243 | } | |
1244 | ||
1245 | static void klist_children_put(struct klist_node *n) | |
1246 | { | |
f791b8c8 GKH |
1247 | struct device_private *p = to_device_private_parent(n); |
1248 | struct device *dev = p->device; | |
34bb61f9 JB |
1249 | |
1250 | put_device(dev); | |
1251 | } | |
1252 | ||
1da177e4 | 1253 | /** |
4a3ad20c GKH |
1254 | * device_initialize - init device structure. |
1255 | * @dev: device. | |
1da177e4 | 1256 | * |
5739411a CH |
1257 | * This prepares the device for use by other layers by initializing |
1258 | * its fields. | |
4a3ad20c | 1259 | * It is the first half of device_register(), if called by |
5739411a CH |
1260 | * that function, though it can also be called separately, so one |
1261 | * may use @dev's fields. In particular, get_device()/put_device() | |
1262 | * may be used for reference counting of @dev after calling this | |
1263 | * function. | |
1264 | * | |
b10d5efd AS |
1265 | * All fields in @dev must be initialized by the caller to 0, except |
1266 | * for those explicitly set to some other value. The simplest | |
1267 | * approach is to use kzalloc() to allocate the structure containing | |
1268 | * @dev. | |
1269 | * | |
5739411a CH |
1270 | * NOTE: Use put_device() to give up your reference instead of freeing |
1271 | * @dev directly once you have called this function. | |
1da177e4 | 1272 | */ |
1da177e4 LT |
1273 | void device_initialize(struct device *dev) |
1274 | { | |
881c6cfd | 1275 | dev->kobj.kset = devices_kset; |
f9cb074b | 1276 | kobject_init(&dev->kobj, &device_ktype); |
1da177e4 | 1277 | INIT_LIST_HEAD(&dev->dma_pools); |
3142788b | 1278 | mutex_init(&dev->mutex); |
1704f47b | 1279 | lockdep_set_novalidate_class(&dev->mutex); |
9ac7849e TH |
1280 | spin_lock_init(&dev->devres_lock); |
1281 | INIT_LIST_HEAD(&dev->devres_head); | |
3b98aeaf | 1282 | device_pm_init(dev); |
87348136 | 1283 | set_dev_node(dev, -1); |
4a7cc831 JL |
1284 | #ifdef CONFIG_GENERIC_MSI_IRQ |
1285 | INIT_LIST_HEAD(&dev->msi_list); | |
1286 | #endif | |
9ed98953 RW |
1287 | INIT_LIST_HEAD(&dev->links.consumers); |
1288 | INIT_LIST_HEAD(&dev->links.suppliers); | |
1289 | dev->links.status = DL_DEV_NO_DRIVER; | |
1da177e4 | 1290 | } |
86df2687 | 1291 | EXPORT_SYMBOL_GPL(device_initialize); |
1da177e4 | 1292 | |
d73ce004 | 1293 | struct kobject *virtual_device_parent(struct device *dev) |
f0ee61a6 | 1294 | { |
86406245 | 1295 | static struct kobject *virtual_dir = NULL; |
f0ee61a6 | 1296 | |
86406245 | 1297 | if (!virtual_dir) |
4ff6abff | 1298 | virtual_dir = kobject_create_and_add("virtual", |
881c6cfd | 1299 | &devices_kset->kobj); |
f0ee61a6 | 1300 | |
86406245 | 1301 | return virtual_dir; |
f0ee61a6 GKH |
1302 | } |
1303 | ||
bc451f20 EB |
1304 | struct class_dir { |
1305 | struct kobject kobj; | |
1306 | struct class *class; | |
1307 | }; | |
1308 | ||
1309 | #define to_class_dir(obj) container_of(obj, struct class_dir, kobj) | |
1310 | ||
1311 | static void class_dir_release(struct kobject *kobj) | |
1312 | { | |
1313 | struct class_dir *dir = to_class_dir(kobj); | |
1314 | kfree(dir); | |
1315 | } | |
1316 | ||
1317 | static const | |
1318 | struct kobj_ns_type_operations *class_dir_child_ns_type(struct kobject *kobj) | |
40fa5422 | 1319 | { |
bc451f20 EB |
1320 | struct class_dir *dir = to_class_dir(kobj); |
1321 | return dir->class->ns_type; | |
1322 | } | |
1323 | ||
1324 | static struct kobj_type class_dir_ktype = { | |
1325 | .release = class_dir_release, | |
1326 | .sysfs_ops = &kobj_sysfs_ops, | |
1327 | .child_ns_type = class_dir_child_ns_type | |
1328 | }; | |
1329 | ||
1330 | static struct kobject * | |
1331 | class_dir_create_and_add(struct class *class, struct kobject *parent_kobj) | |
1332 | { | |
1333 | struct class_dir *dir; | |
43968d2f GKH |
1334 | int retval; |
1335 | ||
bc451f20 EB |
1336 | dir = kzalloc(sizeof(*dir), GFP_KERNEL); |
1337 | if (!dir) | |
1338 | return NULL; | |
1339 | ||
1340 | dir->class = class; | |
1341 | kobject_init(&dir->kobj, &class_dir_ktype); | |
1342 | ||
6b6e39a6 | 1343 | dir->kobj.kset = &class->p->glue_dirs; |
bc451f20 EB |
1344 | |
1345 | retval = kobject_add(&dir->kobj, parent_kobj, "%s", class->name); | |
1346 | if (retval < 0) { | |
1347 | kobject_put(&dir->kobj); | |
1348 | return NULL; | |
1349 | } | |
1350 | return &dir->kobj; | |
1351 | } | |
1352 | ||
e4a60d13 | 1353 | static DEFINE_MUTEX(gdp_mutex); |
bc451f20 EB |
1354 | |
1355 | static struct kobject *get_device_parent(struct device *dev, | |
1356 | struct device *parent) | |
1357 | { | |
86406245 KS |
1358 | if (dev->class) { |
1359 | struct kobject *kobj = NULL; | |
1360 | struct kobject *parent_kobj; | |
1361 | struct kobject *k; | |
1362 | ||
ead454fe | 1363 | #ifdef CONFIG_BLOCK |
39aba963 | 1364 | /* block disks show up in /sys/block */ |
e52eec13 | 1365 | if (sysfs_deprecated && dev->class == &block_class) { |
39aba963 KS |
1366 | if (parent && parent->class == &block_class) |
1367 | return &parent->kobj; | |
6b6e39a6 | 1368 | return &block_class.p->subsys.kobj; |
39aba963 | 1369 | } |
ead454fe | 1370 | #endif |
e52eec13 | 1371 | |
86406245 KS |
1372 | /* |
1373 | * If we have no parent, we live in "virtual". | |
0f4dafc0 KS |
1374 | * Class-devices with a non class-device as parent, live |
1375 | * in a "glue" directory to prevent namespace collisions. | |
86406245 KS |
1376 | */ |
1377 | if (parent == NULL) | |
1378 | parent_kobj = virtual_device_parent(dev); | |
24b1442d | 1379 | else if (parent->class && !dev->class->ns_type) |
86406245 KS |
1380 | return &parent->kobj; |
1381 | else | |
1382 | parent_kobj = &parent->kobj; | |
1383 | ||
77d3d7c1 TH |
1384 | mutex_lock(&gdp_mutex); |
1385 | ||
86406245 | 1386 | /* find our class-directory at the parent and reference it */ |
6b6e39a6 KS |
1387 | spin_lock(&dev->class->p->glue_dirs.list_lock); |
1388 | list_for_each_entry(k, &dev->class->p->glue_dirs.list, entry) | |
86406245 KS |
1389 | if (k->parent == parent_kobj) { |
1390 | kobj = kobject_get(k); | |
1391 | break; | |
1392 | } | |
6b6e39a6 | 1393 | spin_unlock(&dev->class->p->glue_dirs.list_lock); |
77d3d7c1 TH |
1394 | if (kobj) { |
1395 | mutex_unlock(&gdp_mutex); | |
86406245 | 1396 | return kobj; |
77d3d7c1 | 1397 | } |
86406245 KS |
1398 | |
1399 | /* or create a new class-directory at the parent device */ | |
bc451f20 | 1400 | k = class_dir_create_and_add(dev->class, parent_kobj); |
0f4dafc0 | 1401 | /* do not emit an uevent for this simple "glue" directory */ |
77d3d7c1 | 1402 | mutex_unlock(&gdp_mutex); |
43968d2f | 1403 | return k; |
86406245 KS |
1404 | } |
1405 | ||
ca22e56d KS |
1406 | /* subsystems can specify a default root directory for their devices */ |
1407 | if (!parent && dev->bus && dev->bus->dev_root) | |
1408 | return &dev->bus->dev_root->kobj; | |
1409 | ||
86406245 | 1410 | if (parent) |
c744aeae CH |
1411 | return &parent->kobj; |
1412 | return NULL; | |
1413 | } | |
da231fd5 | 1414 | |
cebf8fd1 ML |
1415 | static inline bool live_in_glue_dir(struct kobject *kobj, |
1416 | struct device *dev) | |
1417 | { | |
1418 | if (!kobj || !dev->class || | |
1419 | kobj->kset != &dev->class->p->glue_dirs) | |
1420 | return false; | |
1421 | return true; | |
1422 | } | |
1423 | ||
1424 | static inline struct kobject *get_glue_dir(struct device *dev) | |
1425 | { | |
1426 | return dev->kobj.parent; | |
1427 | } | |
1428 | ||
1429 | /* | |
1430 | * make sure cleaning up dir as the last step, we need to make | |
1431 | * sure .release handler of kobject is run with holding the | |
1432 | * global lock | |
1433 | */ | |
63b6971a | 1434 | static void cleanup_glue_dir(struct device *dev, struct kobject *glue_dir) |
da231fd5 | 1435 | { |
0f4dafc0 | 1436 | /* see if we live in a "glue" directory */ |
cebf8fd1 | 1437 | if (!live_in_glue_dir(glue_dir, dev)) |
da231fd5 KS |
1438 | return; |
1439 | ||
e4a60d13 | 1440 | mutex_lock(&gdp_mutex); |
0f4dafc0 | 1441 | kobject_put(glue_dir); |
e4a60d13 | 1442 | mutex_unlock(&gdp_mutex); |
da231fd5 | 1443 | } |
63b6971a | 1444 | |
2ee97caf CH |
1445 | static int device_add_class_symlinks(struct device *dev) |
1446 | { | |
5590f319 | 1447 | struct device_node *of_node = dev_of_node(dev); |
2ee97caf CH |
1448 | int error; |
1449 | ||
5590f319 BH |
1450 | if (of_node) { |
1451 | error = sysfs_create_link(&dev->kobj, &of_node->kobj,"of_node"); | |
1452 | if (error) | |
1453 | dev_warn(dev, "Error %d creating of_node link\n",error); | |
1454 | /* An error here doesn't warrant bringing down the device */ | |
1455 | } | |
1456 | ||
2ee97caf CH |
1457 | if (!dev->class) |
1458 | return 0; | |
da231fd5 | 1459 | |
1fbfee6c | 1460 | error = sysfs_create_link(&dev->kobj, |
6b6e39a6 | 1461 | &dev->class->p->subsys.kobj, |
2ee97caf CH |
1462 | "subsystem"); |
1463 | if (error) | |
5590f319 | 1464 | goto out_devnode; |
da231fd5 | 1465 | |
4e886c29 | 1466 | if (dev->parent && device_is_not_partition(dev)) { |
39aba963 | 1467 | error = sysfs_create_link(&dev->kobj, &dev->parent->kobj, |
4f01a757 DT |
1468 | "device"); |
1469 | if (error) | |
39aba963 | 1470 | goto out_subsys; |
2ee97caf | 1471 | } |
2ee97caf | 1472 | |
ead454fe | 1473 | #ifdef CONFIG_BLOCK |
39aba963 | 1474 | /* /sys/block has directories and does not need symlinks */ |
e52eec13 | 1475 | if (sysfs_deprecated && dev->class == &block_class) |
39aba963 | 1476 | return 0; |
ead454fe | 1477 | #endif |
39aba963 | 1478 | |
da231fd5 | 1479 | /* link in the class directory pointing to the device */ |
6b6e39a6 | 1480 | error = sysfs_create_link(&dev->class->p->subsys.kobj, |
1e0b2cf9 | 1481 | &dev->kobj, dev_name(dev)); |
da231fd5 | 1482 | if (error) |
39aba963 | 1483 | goto out_device; |
da231fd5 | 1484 | |
da231fd5 KS |
1485 | return 0; |
1486 | ||
39aba963 KS |
1487 | out_device: |
1488 | sysfs_remove_link(&dev->kobj, "device"); | |
da231fd5 | 1489 | |
2ee97caf CH |
1490 | out_subsys: |
1491 | sysfs_remove_link(&dev->kobj, "subsystem"); | |
5590f319 BH |
1492 | out_devnode: |
1493 | sysfs_remove_link(&dev->kobj, "of_node"); | |
2ee97caf CH |
1494 | return error; |
1495 | } | |
1496 | ||
1497 | static void device_remove_class_symlinks(struct device *dev) | |
1498 | { | |
5590f319 BH |
1499 | if (dev_of_node(dev)) |
1500 | sysfs_remove_link(&dev->kobj, "of_node"); | |
1501 | ||
2ee97caf CH |
1502 | if (!dev->class) |
1503 | return; | |
da231fd5 | 1504 | |
4e886c29 | 1505 | if (dev->parent && device_is_not_partition(dev)) |
da231fd5 | 1506 | sysfs_remove_link(&dev->kobj, "device"); |
2ee97caf | 1507 | sysfs_remove_link(&dev->kobj, "subsystem"); |
ead454fe | 1508 | #ifdef CONFIG_BLOCK |
e52eec13 | 1509 | if (sysfs_deprecated && dev->class == &block_class) |
39aba963 | 1510 | return; |
ead454fe | 1511 | #endif |
6b6e39a6 | 1512 | sysfs_delete_link(&dev->class->p->subsys.kobj, &dev->kobj, dev_name(dev)); |
2ee97caf CH |
1513 | } |
1514 | ||
413c239f SR |
1515 | /** |
1516 | * dev_set_name - set a device name | |
1517 | * @dev: device | |
46232366 | 1518 | * @fmt: format string for the device's name |
413c239f SR |
1519 | */ |
1520 | int dev_set_name(struct device *dev, const char *fmt, ...) | |
1521 | { | |
1522 | va_list vargs; | |
1fa5ae85 | 1523 | int err; |
413c239f SR |
1524 | |
1525 | va_start(vargs, fmt); | |
1fa5ae85 | 1526 | err = kobject_set_name_vargs(&dev->kobj, fmt, vargs); |
413c239f | 1527 | va_end(vargs); |
1fa5ae85 | 1528 | return err; |
413c239f SR |
1529 | } |
1530 | EXPORT_SYMBOL_GPL(dev_set_name); | |
1531 | ||
e105b8bf DW |
1532 | /** |
1533 | * device_to_dev_kobj - select a /sys/dev/ directory for the device | |
1534 | * @dev: device | |
1535 | * | |
1536 | * By default we select char/ for new entries. Setting class->dev_obj | |
1537 | * to NULL prevents an entry from being created. class->dev_kobj must | |
1538 | * be set (or cleared) before any devices are registered to the class | |
1539 | * otherwise device_create_sys_dev_entry() and | |
0d4e293c PK |
1540 | * device_remove_sys_dev_entry() will disagree about the presence of |
1541 | * the link. | |
e105b8bf DW |
1542 | */ |
1543 | static struct kobject *device_to_dev_kobj(struct device *dev) | |
1544 | { | |
1545 | struct kobject *kobj; | |
1546 | ||
1547 | if (dev->class) | |
1548 | kobj = dev->class->dev_kobj; | |
1549 | else | |
1550 | kobj = sysfs_dev_char_kobj; | |
1551 | ||
1552 | return kobj; | |
1553 | } | |
1554 | ||
1555 | static int device_create_sys_dev_entry(struct device *dev) | |
1556 | { | |
1557 | struct kobject *kobj = device_to_dev_kobj(dev); | |
1558 | int error = 0; | |
1559 | char devt_str[15]; | |
1560 | ||
1561 | if (kobj) { | |
1562 | format_dev_t(devt_str, dev->devt); | |
1563 | error = sysfs_create_link(kobj, &dev->kobj, devt_str); | |
1564 | } | |
1565 | ||
1566 | return error; | |
1567 | } | |
1568 | ||
1569 | static void device_remove_sys_dev_entry(struct device *dev) | |
1570 | { | |
1571 | struct kobject *kobj = device_to_dev_kobj(dev); | |
1572 | char devt_str[15]; | |
1573 | ||
1574 | if (kobj) { | |
1575 | format_dev_t(devt_str, dev->devt); | |
1576 | sysfs_remove_link(kobj, devt_str); | |
1577 | } | |
1578 | } | |
1579 | ||
b4028437 GKH |
1580 | int device_private_init(struct device *dev) |
1581 | { | |
1582 | dev->p = kzalloc(sizeof(*dev->p), GFP_KERNEL); | |
1583 | if (!dev->p) | |
1584 | return -ENOMEM; | |
1585 | dev->p->device = dev; | |
1586 | klist_init(&dev->p->klist_children, klist_children_get, | |
1587 | klist_children_put); | |
ef8a3fd6 | 1588 | INIT_LIST_HEAD(&dev->p->deferred_probe); |
b4028437 GKH |
1589 | return 0; |
1590 | } | |
1591 | ||
1da177e4 | 1592 | /** |
4a3ad20c GKH |
1593 | * device_add - add device to device hierarchy. |
1594 | * @dev: device. | |
1da177e4 | 1595 | * |
4a3ad20c GKH |
1596 | * This is part 2 of device_register(), though may be called |
1597 | * separately _iff_ device_initialize() has been called separately. | |
1da177e4 | 1598 | * |
5739411a | 1599 | * This adds @dev to the kobject hierarchy via kobject_add(), adds it |
4a3ad20c GKH |
1600 | * to the global and sibling lists for the device, then |
1601 | * adds it to the other relevant subsystems of the driver model. | |
5739411a | 1602 | * |
b10d5efd AS |
1603 | * Do not call this routine or device_register() more than once for |
1604 | * any device structure. The driver model core is not designed to work | |
1605 | * with devices that get unregistered and then spring back to life. | |
1606 | * (Among other things, it's very hard to guarantee that all references | |
1607 | * to the previous incarnation of @dev have been dropped.) Allocate | |
1608 | * and register a fresh new struct device instead. | |
1609 | * | |
5739411a CH |
1610 | * NOTE: _Never_ directly free @dev after calling this function, even |
1611 | * if it returned an error! Always use put_device() to give up your | |
1612 | * reference instead. | |
1da177e4 LT |
1613 | */ |
1614 | int device_add(struct device *dev) | |
1615 | { | |
1616 | struct device *parent = NULL; | |
ca22e56d | 1617 | struct kobject *kobj; |
c47ed219 | 1618 | struct class_interface *class_intf; |
c906a48a | 1619 | int error = -EINVAL; |
cebf8fd1 | 1620 | struct kobject *glue_dir = NULL; |
775b64d2 | 1621 | |
1da177e4 | 1622 | dev = get_device(dev); |
c906a48a GKH |
1623 | if (!dev) |
1624 | goto done; | |
1625 | ||
fb069a5d | 1626 | if (!dev->p) { |
b4028437 GKH |
1627 | error = device_private_init(dev); |
1628 | if (error) | |
1629 | goto done; | |
fb069a5d | 1630 | } |
fb069a5d | 1631 | |
1fa5ae85 KS |
1632 | /* |
1633 | * for statically allocated devices, which should all be converted | |
1634 | * some day, we need to initialize the name. We prevent reading back | |
1635 | * the name, and force the use of dev_name() | |
1636 | */ | |
1637 | if (dev->init_name) { | |
acc0e90f | 1638 | dev_set_name(dev, "%s", dev->init_name); |
1fa5ae85 KS |
1639 | dev->init_name = NULL; |
1640 | } | |
c906a48a | 1641 | |
ca22e56d KS |
1642 | /* subsystems can specify simple device enumeration */ |
1643 | if (!dev_name(dev) && dev->bus && dev->bus->dev_name) | |
1644 | dev_set_name(dev, "%s%u", dev->bus->dev_name, dev->id); | |
1645 | ||
e6309e75 TG |
1646 | if (!dev_name(dev)) { |
1647 | error = -EINVAL; | |
5c8563d7 | 1648 | goto name_error; |
e6309e75 | 1649 | } |
1da177e4 | 1650 | |
1e0b2cf9 | 1651 | pr_debug("device: '%s': %s\n", dev_name(dev), __func__); |
c205ef48 | 1652 | |
1da177e4 | 1653 | parent = get_device(dev->parent); |
ca22e56d KS |
1654 | kobj = get_device_parent(dev, parent); |
1655 | if (kobj) | |
1656 | dev->kobj.parent = kobj; | |
1da177e4 | 1657 | |
0d358f22 | 1658 | /* use parent numa_node */ |
56f2de81 | 1659 | if (parent && (dev_to_node(dev) == NUMA_NO_NODE)) |
0d358f22 YL |
1660 | set_dev_node(dev, dev_to_node(parent)); |
1661 | ||
1da177e4 | 1662 | /* first, register with generic layer. */ |
8a577ffc KS |
1663 | /* we require the name to be set before, and pass NULL */ |
1664 | error = kobject_add(&dev->kobj, dev->kobj.parent, NULL); | |
cebf8fd1 ML |
1665 | if (error) { |
1666 | glue_dir = get_glue_dir(dev); | |
1da177e4 | 1667 | goto Error; |
cebf8fd1 | 1668 | } |
a7fd6706 | 1669 | |
37022644 BW |
1670 | /* notify platform of device entry */ |
1671 | if (platform_notify) | |
1672 | platform_notify(dev); | |
1673 | ||
c5e064a6 | 1674 | error = device_create_file(dev, &dev_attr_uevent); |
a306eea4 CH |
1675 | if (error) |
1676 | goto attrError; | |
a7fd6706 | 1677 | |
2ee97caf CH |
1678 | error = device_add_class_symlinks(dev); |
1679 | if (error) | |
1680 | goto SymlinkError; | |
dc0afa83 CH |
1681 | error = device_add_attrs(dev); |
1682 | if (error) | |
2620efef | 1683 | goto AttrsError; |
dc0afa83 CH |
1684 | error = bus_add_device(dev); |
1685 | if (error) | |
1da177e4 | 1686 | goto BusError; |
3b98aeaf | 1687 | error = dpm_sysfs_add(dev); |
57eee3d2 | 1688 | if (error) |
3b98aeaf AS |
1689 | goto DPMError; |
1690 | device_pm_add(dev); | |
ec0676ee | 1691 | |
0cd75047 SK |
1692 | if (MAJOR(dev->devt)) { |
1693 | error = device_create_file(dev, &dev_attr_dev); | |
1694 | if (error) | |
1695 | goto DevAttrError; | |
1696 | ||
1697 | error = device_create_sys_dev_entry(dev); | |
1698 | if (error) | |
1699 | goto SysEntryError; | |
1700 | ||
1701 | devtmpfs_create_node(dev); | |
1702 | } | |
1703 | ||
ec0676ee | 1704 | /* Notify clients of device addition. This call must come |
268863f4 | 1705 | * after dpm_sysfs_add() and before kobject_uevent(). |
ec0676ee AS |
1706 | */ |
1707 | if (dev->bus) | |
1708 | blocking_notifier_call_chain(&dev->bus->p->bus_notifier, | |
1709 | BUS_NOTIFY_ADD_DEVICE, dev); | |
1710 | ||
83b5fb4c | 1711 | kobject_uevent(&dev->kobj, KOBJ_ADD); |
2023c610 | 1712 | bus_probe_device(dev); |
1da177e4 | 1713 | if (parent) |
f791b8c8 GKH |
1714 | klist_add_tail(&dev->p->knode_parent, |
1715 | &parent->p->klist_children); | |
1da177e4 | 1716 | |
5d9fd169 | 1717 | if (dev->class) { |
ca22e56d | 1718 | mutex_lock(&dev->class->p->mutex); |
c47ed219 | 1719 | /* tie the class to the device */ |
5a3ceb86 | 1720 | klist_add_tail(&dev->knode_class, |
6b6e39a6 | 1721 | &dev->class->p->klist_devices); |
c47ed219 GKH |
1722 | |
1723 | /* notify any interfaces that the device is here */ | |
184f1f77 | 1724 | list_for_each_entry(class_intf, |
ca22e56d | 1725 | &dev->class->p->interfaces, node) |
c47ed219 GKH |
1726 | if (class_intf->add_dev) |
1727 | class_intf->add_dev(dev, class_intf); | |
ca22e56d | 1728 | mutex_unlock(&dev->class->p->mutex); |
5d9fd169 | 1729 | } |
c906a48a | 1730 | done: |
1da177e4 LT |
1731 | put_device(dev); |
1732 | return error; | |
0cd75047 SK |
1733 | SysEntryError: |
1734 | if (MAJOR(dev->devt)) | |
1735 | device_remove_file(dev, &dev_attr_dev); | |
1736 | DevAttrError: | |
1737 | device_pm_remove(dev); | |
1738 | dpm_sysfs_remove(dev); | |
3b98aeaf | 1739 | DPMError: |
57eee3d2 RW |
1740 | bus_remove_device(dev); |
1741 | BusError: | |
82f0cf9b | 1742 | device_remove_attrs(dev); |
2620efef | 1743 | AttrsError: |
2ee97caf CH |
1744 | device_remove_class_symlinks(dev); |
1745 | SymlinkError: | |
c5e064a6 | 1746 | device_remove_file(dev, &dev_attr_uevent); |
23681e47 | 1747 | attrError: |
312c004d | 1748 | kobject_uevent(&dev->kobj, KOBJ_REMOVE); |
cebf8fd1 | 1749 | glue_dir = get_glue_dir(dev); |
1da177e4 LT |
1750 | kobject_del(&dev->kobj); |
1751 | Error: | |
cebf8fd1 | 1752 | cleanup_glue_dir(dev, glue_dir); |
5f0163a5 | 1753 | put_device(parent); |
5c8563d7 KS |
1754 | name_error: |
1755 | kfree(dev->p); | |
1756 | dev->p = NULL; | |
c906a48a | 1757 | goto done; |
1da177e4 | 1758 | } |
86df2687 | 1759 | EXPORT_SYMBOL_GPL(device_add); |
1da177e4 | 1760 | |
1da177e4 | 1761 | /** |
4a3ad20c GKH |
1762 | * device_register - register a device with the system. |
1763 | * @dev: pointer to the device structure | |
1da177e4 | 1764 | * |
4a3ad20c GKH |
1765 | * This happens in two clean steps - initialize the device |
1766 | * and add it to the system. The two steps can be called | |
1767 | * separately, but this is the easiest and most common. | |
1768 | * I.e. you should only call the two helpers separately if | |
1769 | * have a clearly defined need to use and refcount the device | |
1770 | * before it is added to the hierarchy. | |
5739411a | 1771 | * |
b10d5efd AS |
1772 | * For more information, see the kerneldoc for device_initialize() |
1773 | * and device_add(). | |
1774 | * | |
5739411a CH |
1775 | * NOTE: _Never_ directly free @dev after calling this function, even |
1776 | * if it returned an error! Always use put_device() to give up the | |
1777 | * reference initialized in this function instead. | |
1da177e4 | 1778 | */ |
1da177e4 LT |
1779 | int device_register(struct device *dev) |
1780 | { | |
1781 | device_initialize(dev); | |
1782 | return device_add(dev); | |
1783 | } | |
86df2687 | 1784 | EXPORT_SYMBOL_GPL(device_register); |
1da177e4 | 1785 | |
1da177e4 | 1786 | /** |
4a3ad20c GKH |
1787 | * get_device - increment reference count for device. |
1788 | * @dev: device. | |
1da177e4 | 1789 | * |
4a3ad20c GKH |
1790 | * This simply forwards the call to kobject_get(), though |
1791 | * we do take care to provide for the case that we get a NULL | |
1792 | * pointer passed in. | |
1da177e4 | 1793 | */ |
4a3ad20c | 1794 | struct device *get_device(struct device *dev) |
1da177e4 | 1795 | { |
b0d1f807 | 1796 | return dev ? kobj_to_dev(kobject_get(&dev->kobj)) : NULL; |
1da177e4 | 1797 | } |
86df2687 | 1798 | EXPORT_SYMBOL_GPL(get_device); |
1da177e4 | 1799 | |
1da177e4 | 1800 | /** |
4a3ad20c GKH |
1801 | * put_device - decrement reference count. |
1802 | * @dev: device in question. | |
1da177e4 | 1803 | */ |
4a3ad20c | 1804 | void put_device(struct device *dev) |
1da177e4 | 1805 | { |
edfaa7c3 | 1806 | /* might_sleep(); */ |
1da177e4 LT |
1807 | if (dev) |
1808 | kobject_put(&dev->kobj); | |
1809 | } | |
86df2687 | 1810 | EXPORT_SYMBOL_GPL(put_device); |
1da177e4 | 1811 | |
1da177e4 | 1812 | /** |
4a3ad20c GKH |
1813 | * device_del - delete device from system. |
1814 | * @dev: device. | |
1da177e4 | 1815 | * |
4a3ad20c GKH |
1816 | * This is the first part of the device unregistration |
1817 | * sequence. This removes the device from the lists we control | |
1818 | * from here, has it removed from the other driver model | |
1819 | * subsystems it was added to in device_add(), and removes it | |
1820 | * from the kobject hierarchy. | |
1da177e4 | 1821 | * |
4a3ad20c GKH |
1822 | * NOTE: this should be called manually _iff_ device_add() was |
1823 | * also called manually. | |
1da177e4 | 1824 | */ |
4a3ad20c | 1825 | void device_del(struct device *dev) |
1da177e4 | 1826 | { |
4a3ad20c | 1827 | struct device *parent = dev->parent; |
cebf8fd1 | 1828 | struct kobject *glue_dir = NULL; |
c47ed219 | 1829 | struct class_interface *class_intf; |
1da177e4 | 1830 | |
ec0676ee AS |
1831 | /* Notify clients of device removal. This call must come |
1832 | * before dpm_sysfs_remove(). | |
1833 | */ | |
1834 | if (dev->bus) | |
1835 | blocking_notifier_call_chain(&dev->bus->p->bus_notifier, | |
1836 | BUS_NOTIFY_DEL_DEVICE, dev); | |
9ed98953 RW |
1837 | |
1838 | device_links_purge(dev); | |
3b98aeaf | 1839 | dpm_sysfs_remove(dev); |
1da177e4 | 1840 | if (parent) |
f791b8c8 | 1841 | klist_del(&dev->p->knode_parent); |
e105b8bf | 1842 | if (MAJOR(dev->devt)) { |
2b2af54a | 1843 | devtmpfs_delete_node(dev); |
e105b8bf | 1844 | device_remove_sys_dev_entry(dev); |
c5e064a6 | 1845 | device_remove_file(dev, &dev_attr_dev); |
e105b8bf | 1846 | } |
b9d9c82b | 1847 | if (dev->class) { |
da231fd5 | 1848 | device_remove_class_symlinks(dev); |
99ef3ef8 | 1849 | |
ca22e56d | 1850 | mutex_lock(&dev->class->p->mutex); |
c47ed219 | 1851 | /* notify any interfaces that the device is now gone */ |
184f1f77 | 1852 | list_for_each_entry(class_intf, |
ca22e56d | 1853 | &dev->class->p->interfaces, node) |
c47ed219 GKH |
1854 | if (class_intf->remove_dev) |
1855 | class_intf->remove_dev(dev, class_intf); | |
1856 | /* remove the device from the class list */ | |
5a3ceb86 | 1857 | klist_del(&dev->knode_class); |
ca22e56d | 1858 | mutex_unlock(&dev->class->p->mutex); |
b9d9c82b | 1859 | } |
c5e064a6 | 1860 | device_remove_file(dev, &dev_attr_uevent); |
2620efef | 1861 | device_remove_attrs(dev); |
28953533 | 1862 | bus_remove_device(dev); |
4b6d1f12 | 1863 | device_pm_remove(dev); |
d1c3414c | 1864 | driver_deferred_probe_del(dev); |
478573c9 | 1865 | device_remove_properties(dev); |
1da177e4 LT |
1866 | |
1867 | /* Notify the platform of the removal, in case they | |
1868 | * need to do anything... | |
1869 | */ | |
1870 | if (platform_notify_remove) | |
1871 | platform_notify_remove(dev); | |
599bad38 JR |
1872 | if (dev->bus) |
1873 | blocking_notifier_call_chain(&dev->bus->p->bus_notifier, | |
1874 | BUS_NOTIFY_REMOVED_DEVICE, dev); | |
312c004d | 1875 | kobject_uevent(&dev->kobj, KOBJ_REMOVE); |
cebf8fd1 | 1876 | glue_dir = get_glue_dir(dev); |
1da177e4 | 1877 | kobject_del(&dev->kobj); |
cebf8fd1 | 1878 | cleanup_glue_dir(dev, glue_dir); |
da231fd5 | 1879 | put_device(parent); |
1da177e4 | 1880 | } |
86df2687 | 1881 | EXPORT_SYMBOL_GPL(device_del); |
1da177e4 LT |
1882 | |
1883 | /** | |
4a3ad20c GKH |
1884 | * device_unregister - unregister device from system. |
1885 | * @dev: device going away. | |
1da177e4 | 1886 | * |
4a3ad20c GKH |
1887 | * We do this in two parts, like we do device_register(). First, |
1888 | * we remove it from all the subsystems with device_del(), then | |
1889 | * we decrement the reference count via put_device(). If that | |
1890 | * is the final reference count, the device will be cleaned up | |
1891 | * via device_release() above. Otherwise, the structure will | |
1892 | * stick around until the final reference to the device is dropped. | |
1da177e4 | 1893 | */ |
4a3ad20c | 1894 | void device_unregister(struct device *dev) |
1da177e4 | 1895 | { |
1e0b2cf9 | 1896 | pr_debug("device: '%s': %s\n", dev_name(dev), __func__); |
1da177e4 LT |
1897 | device_del(dev); |
1898 | put_device(dev); | |
1899 | } | |
86df2687 | 1900 | EXPORT_SYMBOL_GPL(device_unregister); |
1da177e4 | 1901 | |
3d060aeb AS |
1902 | static struct device *prev_device(struct klist_iter *i) |
1903 | { | |
1904 | struct klist_node *n = klist_prev(i); | |
1905 | struct device *dev = NULL; | |
1906 | struct device_private *p; | |
1907 | ||
1908 | if (n) { | |
1909 | p = to_device_private_parent(n); | |
1910 | dev = p->device; | |
1911 | } | |
1912 | return dev; | |
1913 | } | |
1914 | ||
4a3ad20c | 1915 | static struct device *next_device(struct klist_iter *i) |
36239577 | 1916 | { |
4a3ad20c | 1917 | struct klist_node *n = klist_next(i); |
f791b8c8 GKH |
1918 | struct device *dev = NULL; |
1919 | struct device_private *p; | |
1920 | ||
1921 | if (n) { | |
1922 | p = to_device_private_parent(n); | |
1923 | dev = p->device; | |
1924 | } | |
1925 | return dev; | |
36239577 PM |
1926 | } |
1927 | ||
6fcf53ac | 1928 | /** |
e454cea2 | 1929 | * device_get_devnode - path of device node file |
6fcf53ac | 1930 | * @dev: device |
e454cea2 | 1931 | * @mode: returned file access mode |
3c2670e6 KS |
1932 | * @uid: returned file owner |
1933 | * @gid: returned file group | |
6fcf53ac KS |
1934 | * @tmp: possibly allocated string |
1935 | * | |
1936 | * Return the relative path of a possible device node. | |
1937 | * Non-default names may need to allocate a memory to compose | |
1938 | * a name. This memory is returned in tmp and needs to be | |
1939 | * freed by the caller. | |
1940 | */ | |
e454cea2 | 1941 | const char *device_get_devnode(struct device *dev, |
4e4098a3 | 1942 | umode_t *mode, kuid_t *uid, kgid_t *gid, |
3c2670e6 | 1943 | const char **tmp) |
6fcf53ac KS |
1944 | { |
1945 | char *s; | |
1946 | ||
1947 | *tmp = NULL; | |
1948 | ||
1949 | /* the device type may provide a specific name */ | |
e454cea2 | 1950 | if (dev->type && dev->type->devnode) |
3c2670e6 | 1951 | *tmp = dev->type->devnode(dev, mode, uid, gid); |
6fcf53ac KS |
1952 | if (*tmp) |
1953 | return *tmp; | |
1954 | ||
1955 | /* the class may provide a specific name */ | |
e454cea2 KS |
1956 | if (dev->class && dev->class->devnode) |
1957 | *tmp = dev->class->devnode(dev, mode); | |
6fcf53ac KS |
1958 | if (*tmp) |
1959 | return *tmp; | |
1960 | ||
1961 | /* return name without allocation, tmp == NULL */ | |
1962 | if (strchr(dev_name(dev), '!') == NULL) | |
1963 | return dev_name(dev); | |
1964 | ||
1965 | /* replace '!' in the name with '/' */ | |
a29fd614 RV |
1966 | s = kstrdup(dev_name(dev), GFP_KERNEL); |
1967 | if (!s) | |
6fcf53ac | 1968 | return NULL; |
a29fd614 RV |
1969 | strreplace(s, '!', '/'); |
1970 | return *tmp = s; | |
6fcf53ac KS |
1971 | } |
1972 | ||
1da177e4 | 1973 | /** |
4a3ad20c GKH |
1974 | * device_for_each_child - device child iterator. |
1975 | * @parent: parent struct device. | |
4a3ad20c | 1976 | * @fn: function to be called for each device. |
f8878dcb | 1977 | * @data: data for the callback. |
1da177e4 | 1978 | * |
4a3ad20c GKH |
1979 | * Iterate over @parent's child devices, and call @fn for each, |
1980 | * passing it @data. | |
1da177e4 | 1981 | * |
4a3ad20c GKH |
1982 | * We check the return of @fn each time. If it returns anything |
1983 | * other than 0, we break out and return that value. | |
1da177e4 | 1984 | */ |
4a3ad20c GKH |
1985 | int device_for_each_child(struct device *parent, void *data, |
1986 | int (*fn)(struct device *dev, void *data)) | |
1da177e4 | 1987 | { |
36239577 | 1988 | struct klist_iter i; |
4a3ad20c | 1989 | struct device *child; |
1da177e4 LT |
1990 | int error = 0; |
1991 | ||
014c90db GKH |
1992 | if (!parent->p) |
1993 | return 0; | |
1994 | ||
f791b8c8 | 1995 | klist_iter_init(&parent->p->klist_children, &i); |
36239577 PM |
1996 | while ((child = next_device(&i)) && !error) |
1997 | error = fn(child, data); | |
1998 | klist_iter_exit(&i); | |
1da177e4 LT |
1999 | return error; |
2000 | } | |
86df2687 | 2001 | EXPORT_SYMBOL_GPL(device_for_each_child); |
1da177e4 | 2002 | |
3d060aeb AS |
2003 | /** |
2004 | * device_for_each_child_reverse - device child iterator in reversed order. | |
2005 | * @parent: parent struct device. | |
2006 | * @fn: function to be called for each device. | |
2007 | * @data: data for the callback. | |
2008 | * | |
2009 | * Iterate over @parent's child devices, and call @fn for each, | |
2010 | * passing it @data. | |
2011 | * | |
2012 | * We check the return of @fn each time. If it returns anything | |
2013 | * other than 0, we break out and return that value. | |
2014 | */ | |
2015 | int device_for_each_child_reverse(struct device *parent, void *data, | |
2016 | int (*fn)(struct device *dev, void *data)) | |
2017 | { | |
2018 | struct klist_iter i; | |
2019 | struct device *child; | |
2020 | int error = 0; | |
2021 | ||
2022 | if (!parent->p) | |
2023 | return 0; | |
2024 | ||
2025 | klist_iter_init(&parent->p->klist_children, &i); | |
2026 | while ((child = prev_device(&i)) && !error) | |
2027 | error = fn(child, data); | |
2028 | klist_iter_exit(&i); | |
2029 | return error; | |
2030 | } | |
2031 | EXPORT_SYMBOL_GPL(device_for_each_child_reverse); | |
2032 | ||
5ab69981 CH |
2033 | /** |
2034 | * device_find_child - device iterator for locating a particular device. | |
2035 | * @parent: parent struct device | |
5ab69981 | 2036 | * @match: Callback function to check device |
f8878dcb | 2037 | * @data: Data to pass to match function |
5ab69981 CH |
2038 | * |
2039 | * This is similar to the device_for_each_child() function above, but it | |
2040 | * returns a reference to a device that is 'found' for later use, as | |
2041 | * determined by the @match callback. | |
2042 | * | |
2043 | * The callback should return 0 if the device doesn't match and non-zero | |
2044 | * if it does. If the callback returns non-zero and a reference to the | |
2045 | * current device can be obtained, this function will return to the caller | |
2046 | * and not iterate over any more devices. | |
a4e2400a FV |
2047 | * |
2048 | * NOTE: you will need to drop the reference with put_device() after use. | |
5ab69981 | 2049 | */ |
4a3ad20c GKH |
2050 | struct device *device_find_child(struct device *parent, void *data, |
2051 | int (*match)(struct device *dev, void *data)) | |
5ab69981 CH |
2052 | { |
2053 | struct klist_iter i; | |
2054 | struct device *child; | |
2055 | ||
2056 | if (!parent) | |
2057 | return NULL; | |
2058 | ||
f791b8c8 | 2059 | klist_iter_init(&parent->p->klist_children, &i); |
5ab69981 CH |
2060 | while ((child = next_device(&i))) |
2061 | if (match(child, data) && get_device(child)) | |
2062 | break; | |
2063 | klist_iter_exit(&i); | |
2064 | return child; | |
2065 | } | |
86df2687 | 2066 | EXPORT_SYMBOL_GPL(device_find_child); |
5ab69981 | 2067 | |
1da177e4 LT |
2068 | int __init devices_init(void) |
2069 | { | |
881c6cfd GKH |
2070 | devices_kset = kset_create_and_add("devices", &device_uevent_ops, NULL); |
2071 | if (!devices_kset) | |
2072 | return -ENOMEM; | |
e105b8bf DW |
2073 | dev_kobj = kobject_create_and_add("dev", NULL); |
2074 | if (!dev_kobj) | |
2075 | goto dev_kobj_err; | |
2076 | sysfs_dev_block_kobj = kobject_create_and_add("block", dev_kobj); | |
2077 | if (!sysfs_dev_block_kobj) | |
2078 | goto block_kobj_err; | |
2079 | sysfs_dev_char_kobj = kobject_create_and_add("char", dev_kobj); | |
2080 | if (!sysfs_dev_char_kobj) | |
2081 | goto char_kobj_err; | |
2082 | ||
881c6cfd | 2083 | return 0; |
e105b8bf DW |
2084 | |
2085 | char_kobj_err: | |
2086 | kobject_put(sysfs_dev_block_kobj); | |
2087 | block_kobj_err: | |
2088 | kobject_put(dev_kobj); | |
2089 | dev_kobj_err: | |
2090 | kset_unregister(devices_kset); | |
2091 | return -ENOMEM; | |
1da177e4 LT |
2092 | } |
2093 | ||
4f3549d7 RW |
2094 | static int device_check_offline(struct device *dev, void *not_used) |
2095 | { | |
2096 | int ret; | |
2097 | ||
2098 | ret = device_for_each_child(dev, NULL, device_check_offline); | |
2099 | if (ret) | |
2100 | return ret; | |
2101 | ||
2102 | return device_supports_offline(dev) && !dev->offline ? -EBUSY : 0; | |
2103 | } | |
2104 | ||
2105 | /** | |
2106 | * device_offline - Prepare the device for hot-removal. | |
2107 | * @dev: Device to be put offline. | |
2108 | * | |
2109 | * Execute the device bus type's .offline() callback, if present, to prepare | |
2110 | * the device for a subsequent hot-removal. If that succeeds, the device must | |
2111 | * not be used until either it is removed or its bus type's .online() callback | |
2112 | * is executed. | |
2113 | * | |
2114 | * Call under device_hotplug_lock. | |
2115 | */ | |
2116 | int device_offline(struct device *dev) | |
2117 | { | |
2118 | int ret; | |
2119 | ||
2120 | if (dev->offline_disabled) | |
2121 | return -EPERM; | |
2122 | ||
2123 | ret = device_for_each_child(dev, NULL, device_check_offline); | |
2124 | if (ret) | |
2125 | return ret; | |
2126 | ||
2127 | device_lock(dev); | |
2128 | if (device_supports_offline(dev)) { | |
2129 | if (dev->offline) { | |
2130 | ret = 1; | |
2131 | } else { | |
2132 | ret = dev->bus->offline(dev); | |
2133 | if (!ret) { | |
2134 | kobject_uevent(&dev->kobj, KOBJ_OFFLINE); | |
2135 | dev->offline = true; | |
2136 | } | |
2137 | } | |
2138 | } | |
2139 | device_unlock(dev); | |
2140 | ||
2141 | return ret; | |
2142 | } | |
2143 | ||
2144 | /** | |
2145 | * device_online - Put the device back online after successful device_offline(). | |
2146 | * @dev: Device to be put back online. | |
2147 | * | |
2148 | * If device_offline() has been successfully executed for @dev, but the device | |
2149 | * has not been removed subsequently, execute its bus type's .online() callback | |
2150 | * to indicate that the device can be used again. | |
2151 | * | |
2152 | * Call under device_hotplug_lock. | |
2153 | */ | |
2154 | int device_online(struct device *dev) | |
2155 | { | |
2156 | int ret = 0; | |
2157 | ||
2158 | device_lock(dev); | |
2159 | if (device_supports_offline(dev)) { | |
2160 | if (dev->offline) { | |
2161 | ret = dev->bus->online(dev); | |
2162 | if (!ret) { | |
2163 | kobject_uevent(&dev->kobj, KOBJ_ONLINE); | |
2164 | dev->offline = false; | |
2165 | } | |
2166 | } else { | |
2167 | ret = 1; | |
2168 | } | |
2169 | } | |
2170 | device_unlock(dev); | |
2171 | ||
2172 | return ret; | |
2173 | } | |
2174 | ||
7f100d15 | 2175 | struct root_device { |
0aa0dc41 MM |
2176 | struct device dev; |
2177 | struct module *owner; | |
2178 | }; | |
2179 | ||
93058424 | 2180 | static inline struct root_device *to_root_device(struct device *d) |
481e2079 FW |
2181 | { |
2182 | return container_of(d, struct root_device, dev); | |
2183 | } | |
0aa0dc41 MM |
2184 | |
2185 | static void root_device_release(struct device *dev) | |
2186 | { | |
2187 | kfree(to_root_device(dev)); | |
2188 | } | |
2189 | ||
2190 | /** | |
2191 | * __root_device_register - allocate and register a root device | |
2192 | * @name: root device name | |
2193 | * @owner: owner module of the root device, usually THIS_MODULE | |
2194 | * | |
2195 | * This function allocates a root device and registers it | |
2196 | * using device_register(). In order to free the returned | |
2197 | * device, use root_device_unregister(). | |
2198 | * | |
2199 | * Root devices are dummy devices which allow other devices | |
2200 | * to be grouped under /sys/devices. Use this function to | |
2201 | * allocate a root device and then use it as the parent of | |
2202 | * any device which should appear under /sys/devices/{name} | |
2203 | * | |
2204 | * The /sys/devices/{name} directory will also contain a | |
2205 | * 'module' symlink which points to the @owner directory | |
2206 | * in sysfs. | |
2207 | * | |
f0eae0ed JN |
2208 | * Returns &struct device pointer on success, or ERR_PTR() on error. |
2209 | * | |
0aa0dc41 MM |
2210 | * Note: You probably want to use root_device_register(). |
2211 | */ | |
2212 | struct device *__root_device_register(const char *name, struct module *owner) | |
2213 | { | |
2214 | struct root_device *root; | |
2215 | int err = -ENOMEM; | |
2216 | ||
2217 | root = kzalloc(sizeof(struct root_device), GFP_KERNEL); | |
2218 | if (!root) | |
2219 | return ERR_PTR(err); | |
2220 | ||
acc0e90f | 2221 | err = dev_set_name(&root->dev, "%s", name); |
0aa0dc41 MM |
2222 | if (err) { |
2223 | kfree(root); | |
2224 | return ERR_PTR(err); | |
2225 | } | |
2226 | ||
2227 | root->dev.release = root_device_release; | |
2228 | ||
2229 | err = device_register(&root->dev); | |
2230 | if (err) { | |
2231 | put_device(&root->dev); | |
2232 | return ERR_PTR(err); | |
2233 | } | |
2234 | ||
1d9e882b | 2235 | #ifdef CONFIG_MODULES /* gotta find a "cleaner" way to do this */ |
0aa0dc41 MM |
2236 | if (owner) { |
2237 | struct module_kobject *mk = &owner->mkobj; | |
2238 | ||
2239 | err = sysfs_create_link(&root->dev.kobj, &mk->kobj, "module"); | |
2240 | if (err) { | |
2241 | device_unregister(&root->dev); | |
2242 | return ERR_PTR(err); | |
2243 | } | |
2244 | root->owner = owner; | |
2245 | } | |
2246 | #endif | |
2247 | ||
2248 | return &root->dev; | |
2249 | } | |
2250 | EXPORT_SYMBOL_GPL(__root_device_register); | |
2251 | ||
2252 | /** | |
2253 | * root_device_unregister - unregister and free a root device | |
7cbcf225 | 2254 | * @dev: device going away |
0aa0dc41 MM |
2255 | * |
2256 | * This function unregisters and cleans up a device that was created by | |
2257 | * root_device_register(). | |
2258 | */ | |
2259 | void root_device_unregister(struct device *dev) | |
2260 | { | |
2261 | struct root_device *root = to_root_device(dev); | |
2262 | ||
2263 | if (root->owner) | |
2264 | sysfs_remove_link(&root->dev.kobj, "module"); | |
2265 | ||
2266 | device_unregister(dev); | |
2267 | } | |
2268 | EXPORT_SYMBOL_GPL(root_device_unregister); | |
2269 | ||
23681e47 GKH |
2270 | |
2271 | static void device_create_release(struct device *dev) | |
2272 | { | |
1e0b2cf9 | 2273 | pr_debug("device: '%s': %s\n", dev_name(dev), __func__); |
23681e47 GKH |
2274 | kfree(dev); |
2275 | } | |
2276 | ||
39ef3112 GR |
2277 | static struct device * |
2278 | device_create_groups_vargs(struct class *class, struct device *parent, | |
2279 | dev_t devt, void *drvdata, | |
2280 | const struct attribute_group **groups, | |
2281 | const char *fmt, va_list args) | |
23681e47 | 2282 | { |
23681e47 GKH |
2283 | struct device *dev = NULL; |
2284 | int retval = -ENODEV; | |
2285 | ||
2286 | if (class == NULL || IS_ERR(class)) | |
2287 | goto error; | |
23681e47 GKH |
2288 | |
2289 | dev = kzalloc(sizeof(*dev), GFP_KERNEL); | |
2290 | if (!dev) { | |
2291 | retval = -ENOMEM; | |
2292 | goto error; | |
2293 | } | |
2294 | ||
bbc780f8 | 2295 | device_initialize(dev); |
23681e47 GKH |
2296 | dev->devt = devt; |
2297 | dev->class = class; | |
2298 | dev->parent = parent; | |
39ef3112 | 2299 | dev->groups = groups; |
23681e47 | 2300 | dev->release = device_create_release; |
8882b394 | 2301 | dev_set_drvdata(dev, drvdata); |
23681e47 | 2302 | |
1fa5ae85 KS |
2303 | retval = kobject_set_name_vargs(&dev->kobj, fmt, args); |
2304 | if (retval) | |
2305 | goto error; | |
2306 | ||
bbc780f8 | 2307 | retval = device_add(dev); |
23681e47 GKH |
2308 | if (retval) |
2309 | goto error; | |
2310 | ||
23681e47 GKH |
2311 | return dev; |
2312 | ||
2313 | error: | |
286661b3 | 2314 | put_device(dev); |
23681e47 GKH |
2315 | return ERR_PTR(retval); |
2316 | } | |
39ef3112 GR |
2317 | |
2318 | /** | |
2319 | * device_create_vargs - creates a device and registers it with sysfs | |
2320 | * @class: pointer to the struct class that this device should be registered to | |
2321 | * @parent: pointer to the parent struct device of this new device, if any | |
2322 | * @devt: the dev_t for the char device to be added | |
2323 | * @drvdata: the data to be added to the device for callbacks | |
2324 | * @fmt: string for the device's name | |
2325 | * @args: va_list for the device's name | |
2326 | * | |
2327 | * This function can be used by char device classes. A struct device | |
2328 | * will be created in sysfs, registered to the specified class. | |
2329 | * | |
2330 | * A "dev" file will be created, showing the dev_t for the device, if | |
2331 | * the dev_t is not 0,0. | |
2332 | * If a pointer to a parent struct device is passed in, the newly created | |
2333 | * struct device will be a child of that device in sysfs. | |
2334 | * The pointer to the struct device will be returned from the call. | |
2335 | * Any further sysfs files that might be required can be created using this | |
2336 | * pointer. | |
2337 | * | |
2338 | * Returns &struct device pointer on success, or ERR_PTR() on error. | |
2339 | * | |
2340 | * Note: the struct class passed to this function must have previously | |
2341 | * been created with a call to class_create(). | |
2342 | */ | |
2343 | struct device *device_create_vargs(struct class *class, struct device *parent, | |
2344 | dev_t devt, void *drvdata, const char *fmt, | |
2345 | va_list args) | |
2346 | { | |
2347 | return device_create_groups_vargs(class, parent, devt, drvdata, NULL, | |
2348 | fmt, args); | |
2349 | } | |
8882b394 GKH |
2350 | EXPORT_SYMBOL_GPL(device_create_vargs); |
2351 | ||
2352 | /** | |
4e106739 | 2353 | * device_create - creates a device and registers it with sysfs |
8882b394 GKH |
2354 | * @class: pointer to the struct class that this device should be registered to |
2355 | * @parent: pointer to the parent struct device of this new device, if any | |
2356 | * @devt: the dev_t for the char device to be added | |
2357 | * @drvdata: the data to be added to the device for callbacks | |
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 | * | |
2363 | * A "dev" file will be created, showing the dev_t for the device, if | |
2364 | * the dev_t is not 0,0. | |
2365 | * If a pointer to a parent struct device is passed in, the newly created | |
2366 | * struct device will be a child of that device in sysfs. | |
2367 | * The pointer to the struct device will be returned from the call. | |
2368 | * Any further sysfs files that might be required can be created using this | |
2369 | * pointer. | |
2370 | * | |
f0eae0ed JN |
2371 | * Returns &struct device pointer on success, or ERR_PTR() on error. |
2372 | * | |
8882b394 GKH |
2373 | * Note: the struct class passed to this function must have previously |
2374 | * been created with a call to class_create(). | |
2375 | */ | |
4e106739 GKH |
2376 | struct device *device_create(struct class *class, struct device *parent, |
2377 | dev_t devt, void *drvdata, const char *fmt, ...) | |
8882b394 GKH |
2378 | { |
2379 | va_list vargs; | |
2380 | struct device *dev; | |
2381 | ||
2382 | va_start(vargs, fmt); | |
2383 | dev = device_create_vargs(class, parent, devt, drvdata, fmt, vargs); | |
2384 | va_end(vargs); | |
2385 | return dev; | |
2386 | } | |
4e106739 | 2387 | EXPORT_SYMBOL_GPL(device_create); |
8882b394 | 2388 | |
39ef3112 GR |
2389 | /** |
2390 | * device_create_with_groups - creates a device and registers it with sysfs | |
2391 | * @class: pointer to the struct class that this device should be registered to | |
2392 | * @parent: pointer to the parent struct device of this new device, if any | |
2393 | * @devt: the dev_t for the char device to be added | |
2394 | * @drvdata: the data to be added to the device for callbacks | |
2395 | * @groups: NULL-terminated list of attribute groups to be created | |
2396 | * @fmt: string for the device's name | |
2397 | * | |
2398 | * This function can be used by char device classes. A struct device | |
2399 | * will be created in sysfs, registered to the specified class. | |
2400 | * Additional attributes specified in the groups parameter will also | |
2401 | * be created automatically. | |
2402 | * | |
2403 | * A "dev" file will be created, showing the dev_t for the device, if | |
2404 | * the dev_t is not 0,0. | |
2405 | * If a pointer to a parent struct device is passed in, the newly created | |
2406 | * struct device will be a child of that device in sysfs. | |
2407 | * The pointer to the struct device will be returned from the call. | |
2408 | * Any further sysfs files that might be required can be created using this | |
2409 | * pointer. | |
2410 | * | |
2411 | * Returns &struct device pointer on success, or ERR_PTR() on error. | |
2412 | * | |
2413 | * Note: the struct class passed to this function must have previously | |
2414 | * been created with a call to class_create(). | |
2415 | */ | |
2416 | struct device *device_create_with_groups(struct class *class, | |
2417 | struct device *parent, dev_t devt, | |
2418 | void *drvdata, | |
2419 | const struct attribute_group **groups, | |
2420 | const char *fmt, ...) | |
2421 | { | |
2422 | va_list vargs; | |
2423 | struct device *dev; | |
2424 | ||
2425 | va_start(vargs, fmt); | |
2426 | dev = device_create_groups_vargs(class, parent, devt, drvdata, groups, | |
2427 | fmt, vargs); | |
2428 | va_end(vargs); | |
2429 | return dev; | |
2430 | } | |
2431 | EXPORT_SYMBOL_GPL(device_create_with_groups); | |
2432 | ||
9f3b795a | 2433 | static int __match_devt(struct device *dev, const void *data) |
23681e47 | 2434 | { |
9f3b795a | 2435 | const dev_t *devt = data; |
23681e47 | 2436 | |
cd35449b | 2437 | return dev->devt == *devt; |
775b64d2 RW |
2438 | } |
2439 | ||
2440 | /** | |
2441 | * device_destroy - removes a device that was created with device_create() | |
2442 | * @class: pointer to the struct class that this device was registered with | |
2443 | * @devt: the dev_t of the device that was previously registered | |
2444 | * | |
2445 | * This call unregisters and cleans up a device that was created with a | |
2446 | * call to device_create(). | |
2447 | */ | |
2448 | void device_destroy(struct class *class, dev_t devt) | |
2449 | { | |
2450 | struct device *dev; | |
23681e47 | 2451 | |
695794ae | 2452 | dev = class_find_device(class, NULL, &devt, __match_devt); |
cd35449b DY |
2453 | if (dev) { |
2454 | put_device(dev); | |
23681e47 | 2455 | device_unregister(dev); |
cd35449b | 2456 | } |
23681e47 GKH |
2457 | } |
2458 | EXPORT_SYMBOL_GPL(device_destroy); | |
a2de48ca GKH |
2459 | |
2460 | /** | |
2461 | * device_rename - renames a device | |
2462 | * @dev: the pointer to the struct device to be renamed | |
2463 | * @new_name: the new name of the device | |
030c1d2b EB |
2464 | * |
2465 | * It is the responsibility of the caller to provide mutual | |
2466 | * exclusion between two different calls of device_rename | |
2467 | * on the same device to ensure that new_name is valid and | |
2468 | * won't conflict with other devices. | |
c6c0ac66 | 2469 | * |
a5462516 TT |
2470 | * Note: Don't call this function. Currently, the networking layer calls this |
2471 | * function, but that will change. The following text from Kay Sievers offers | |
2472 | * some insight: | |
2473 | * | |
2474 | * Renaming devices is racy at many levels, symlinks and other stuff are not | |
2475 | * replaced atomically, and you get a "move" uevent, but it's not easy to | |
2476 | * connect the event to the old and new device. Device nodes are not renamed at | |
2477 | * all, there isn't even support for that in the kernel now. | |
2478 | * | |
2479 | * In the meantime, during renaming, your target name might be taken by another | |
2480 | * driver, creating conflicts. Or the old name is taken directly after you | |
2481 | * renamed it -- then you get events for the same DEVPATH, before you even see | |
2482 | * the "move" event. It's just a mess, and nothing new should ever rely on | |
2483 | * kernel device renaming. Besides that, it's not even implemented now for | |
2484 | * other things than (driver-core wise very simple) network devices. | |
2485 | * | |
2486 | * We are currently about to change network renaming in udev to completely | |
2487 | * disallow renaming of devices in the same namespace as the kernel uses, | |
2488 | * because we can't solve the problems properly, that arise with swapping names | |
2489 | * of multiple interfaces without races. Means, renaming of eth[0-9]* will only | |
2490 | * be allowed to some other name than eth[0-9]*, for the aforementioned | |
2491 | * reasons. | |
2492 | * | |
2493 | * Make up a "real" name in the driver before you register anything, or add | |
2494 | * some other attributes for userspace to find the device, or use udev to add | |
2495 | * symlinks -- but never rename kernel devices later, it's a complete mess. We | |
2496 | * don't even want to get into that and try to implement the missing pieces in | |
2497 | * the core. We really have other pieces to fix in the driver core mess. :) | |
a2de48ca | 2498 | */ |
6937e8f8 | 2499 | int device_rename(struct device *dev, const char *new_name) |
a2de48ca | 2500 | { |
4b30ee58 | 2501 | struct kobject *kobj = &dev->kobj; |
2ee97caf | 2502 | char *old_device_name = NULL; |
a2de48ca GKH |
2503 | int error; |
2504 | ||
2505 | dev = get_device(dev); | |
2506 | if (!dev) | |
2507 | return -EINVAL; | |
2508 | ||
69df7533 | 2509 | dev_dbg(dev, "renaming to %s\n", new_name); |
a2de48ca | 2510 | |
1fa5ae85 | 2511 | old_device_name = kstrdup(dev_name(dev), GFP_KERNEL); |
2ee97caf CH |
2512 | if (!old_device_name) { |
2513 | error = -ENOMEM; | |
2514 | goto out; | |
a2de48ca | 2515 | } |
a2de48ca | 2516 | |
f349cf34 | 2517 | if (dev->class) { |
4b30ee58 TH |
2518 | error = sysfs_rename_link_ns(&dev->class->p->subsys.kobj, |
2519 | kobj, old_device_name, | |
2520 | new_name, kobject_namespace(kobj)); | |
f349cf34 EB |
2521 | if (error) |
2522 | goto out; | |
2523 | } | |
39aba963 | 2524 | |
4b30ee58 | 2525 | error = kobject_rename(kobj, new_name); |
1fa5ae85 | 2526 | if (error) |
2ee97caf | 2527 | goto out; |
a2de48ca | 2528 | |
2ee97caf | 2529 | out: |
a2de48ca GKH |
2530 | put_device(dev); |
2531 | ||
2ee97caf | 2532 | kfree(old_device_name); |
a2de48ca GKH |
2533 | |
2534 | return error; | |
2535 | } | |
a2807dbc | 2536 | EXPORT_SYMBOL_GPL(device_rename); |
8a82472f CH |
2537 | |
2538 | static int device_move_class_links(struct device *dev, | |
2539 | struct device *old_parent, | |
2540 | struct device *new_parent) | |
2541 | { | |
f7f3461d | 2542 | int error = 0; |
8a82472f | 2543 | |
f7f3461d GKH |
2544 | if (old_parent) |
2545 | sysfs_remove_link(&dev->kobj, "device"); | |
2546 | if (new_parent) | |
2547 | error = sysfs_create_link(&dev->kobj, &new_parent->kobj, | |
2548 | "device"); | |
2549 | return error; | |
8a82472f CH |
2550 | } |
2551 | ||
2552 | /** | |
2553 | * device_move - moves a device to a new parent | |
2554 | * @dev: the pointer to the struct device to be moved | |
c744aeae | 2555 | * @new_parent: the new parent of the device (can by NULL) |
ffa6a705 | 2556 | * @dpm_order: how to reorder the dpm_list |
8a82472f | 2557 | */ |
ffa6a705 CH |
2558 | int device_move(struct device *dev, struct device *new_parent, |
2559 | enum dpm_order dpm_order) | |
8a82472f CH |
2560 | { |
2561 | int error; | |
2562 | struct device *old_parent; | |
c744aeae | 2563 | struct kobject *new_parent_kobj; |
8a82472f CH |
2564 | |
2565 | dev = get_device(dev); | |
2566 | if (!dev) | |
2567 | return -EINVAL; | |
2568 | ||
ffa6a705 | 2569 | device_pm_lock(); |
8a82472f | 2570 | new_parent = get_device(new_parent); |
4a3ad20c | 2571 | new_parent_kobj = get_device_parent(dev, new_parent); |
63b6971a | 2572 | |
1e0b2cf9 KS |
2573 | pr_debug("device: '%s': %s: moving to '%s'\n", dev_name(dev), |
2574 | __func__, new_parent ? dev_name(new_parent) : "<NULL>"); | |
c744aeae | 2575 | error = kobject_move(&dev->kobj, new_parent_kobj); |
8a82472f | 2576 | if (error) { |
63b6971a | 2577 | cleanup_glue_dir(dev, new_parent_kobj); |
8a82472f CH |
2578 | put_device(new_parent); |
2579 | goto out; | |
2580 | } | |
2581 | old_parent = dev->parent; | |
2582 | dev->parent = new_parent; | |
2583 | if (old_parent) | |
f791b8c8 | 2584 | klist_remove(&dev->p->knode_parent); |
0d358f22 | 2585 | if (new_parent) { |
f791b8c8 GKH |
2586 | klist_add_tail(&dev->p->knode_parent, |
2587 | &new_parent->p->klist_children); | |
0d358f22 YL |
2588 | set_dev_node(dev, dev_to_node(new_parent)); |
2589 | } | |
2590 | ||
bdd4034d RV |
2591 | if (dev->class) { |
2592 | error = device_move_class_links(dev, old_parent, new_parent); | |
2593 | if (error) { | |
2594 | /* We ignore errors on cleanup since we're hosed anyway... */ | |
2595 | device_move_class_links(dev, new_parent, old_parent); | |
2596 | if (!kobject_move(&dev->kobj, &old_parent->kobj)) { | |
2597 | if (new_parent) | |
2598 | klist_remove(&dev->p->knode_parent); | |
2599 | dev->parent = old_parent; | |
2600 | if (old_parent) { | |
2601 | klist_add_tail(&dev->p->knode_parent, | |
2602 | &old_parent->p->klist_children); | |
2603 | set_dev_node(dev, dev_to_node(old_parent)); | |
2604 | } | |
0d358f22 | 2605 | } |
bdd4034d RV |
2606 | cleanup_glue_dir(dev, new_parent_kobj); |
2607 | put_device(new_parent); | |
2608 | goto out; | |
8a82472f | 2609 | } |
8a82472f | 2610 | } |
ffa6a705 CH |
2611 | switch (dpm_order) { |
2612 | case DPM_ORDER_NONE: | |
2613 | break; | |
2614 | case DPM_ORDER_DEV_AFTER_PARENT: | |
2615 | device_pm_move_after(dev, new_parent); | |
52cdbdd4 | 2616 | devices_kset_move_after(dev, new_parent); |
ffa6a705 CH |
2617 | break; |
2618 | case DPM_ORDER_PARENT_BEFORE_DEV: | |
2619 | device_pm_move_before(new_parent, dev); | |
52cdbdd4 | 2620 | devices_kset_move_before(new_parent, dev); |
ffa6a705 CH |
2621 | break; |
2622 | case DPM_ORDER_DEV_LAST: | |
2623 | device_pm_move_last(dev); | |
52cdbdd4 | 2624 | devices_kset_move_last(dev); |
ffa6a705 CH |
2625 | break; |
2626 | } | |
bdd4034d | 2627 | |
8a82472f CH |
2628 | put_device(old_parent); |
2629 | out: | |
ffa6a705 | 2630 | device_pm_unlock(); |
8a82472f CH |
2631 | put_device(dev); |
2632 | return error; | |
2633 | } | |
8a82472f | 2634 | EXPORT_SYMBOL_GPL(device_move); |
37b0c020 GKH |
2635 | |
2636 | /** | |
2637 | * device_shutdown - call ->shutdown() on each device to shutdown. | |
2638 | */ | |
2639 | void device_shutdown(void) | |
2640 | { | |
f123db8e | 2641 | struct device *dev, *parent; |
6245838f HD |
2642 | |
2643 | spin_lock(&devices_kset->list_lock); | |
2644 | /* | |
2645 | * Walk the devices list backward, shutting down each in turn. | |
2646 | * Beware that device unplug events may also start pulling | |
2647 | * devices offline, even as the system is shutting down. | |
2648 | */ | |
2649 | while (!list_empty(&devices_kset->list)) { | |
2650 | dev = list_entry(devices_kset->list.prev, struct device, | |
2651 | kobj.entry); | |
d1c6c030 ML |
2652 | |
2653 | /* | |
2654 | * hold reference count of device's parent to | |
2655 | * prevent it from being freed because parent's | |
2656 | * lock is to be held | |
2657 | */ | |
f123db8e | 2658 | parent = get_device(dev->parent); |
6245838f HD |
2659 | get_device(dev); |
2660 | /* | |
2661 | * Make sure the device is off the kset list, in the | |
2662 | * event that dev->*->shutdown() doesn't remove it. | |
2663 | */ | |
2664 | list_del_init(&dev->kobj.entry); | |
2665 | spin_unlock(&devices_kset->list_lock); | |
fe6b91f4 | 2666 | |
d1c6c030 | 2667 | /* hold lock to avoid race with probe/release */ |
f123db8e BL |
2668 | if (parent) |
2669 | device_lock(parent); | |
d1c6c030 ML |
2670 | device_lock(dev); |
2671 | ||
fe6b91f4 AS |
2672 | /* Don't allow any more runtime suspends */ |
2673 | pm_runtime_get_noresume(dev); | |
2674 | pm_runtime_barrier(dev); | |
37b0c020 | 2675 | |
37b0c020 | 2676 | if (dev->bus && dev->bus->shutdown) { |
0246c4fa SL |
2677 | if (initcall_debug) |
2678 | dev_info(dev, "shutdown\n"); | |
37b0c020 GKH |
2679 | dev->bus->shutdown(dev); |
2680 | } else if (dev->driver && dev->driver->shutdown) { | |
0246c4fa SL |
2681 | if (initcall_debug) |
2682 | dev_info(dev, "shutdown\n"); | |
37b0c020 GKH |
2683 | dev->driver->shutdown(dev); |
2684 | } | |
d1c6c030 ML |
2685 | |
2686 | device_unlock(dev); | |
f123db8e BL |
2687 | if (parent) |
2688 | device_unlock(parent); | |
d1c6c030 | 2689 | |
6245838f | 2690 | put_device(dev); |
f123db8e | 2691 | put_device(parent); |
6245838f HD |
2692 | |
2693 | spin_lock(&devices_kset->list_lock); | |
37b0c020 | 2694 | } |
6245838f | 2695 | spin_unlock(&devices_kset->list_lock); |
37b0c020 | 2696 | } |
99bcf217 JP |
2697 | |
2698 | /* | |
2699 | * Device logging functions | |
2700 | */ | |
2701 | ||
2702 | #ifdef CONFIG_PRINTK | |
666f355f JP |
2703 | static int |
2704 | create_syslog_header(const struct device *dev, char *hdr, size_t hdrlen) | |
99bcf217 | 2705 | { |
c4e00daa | 2706 | const char *subsys; |
798efc60 | 2707 | size_t pos = 0; |
99bcf217 | 2708 | |
c4e00daa KS |
2709 | if (dev->class) |
2710 | subsys = dev->class->name; | |
2711 | else if (dev->bus) | |
2712 | subsys = dev->bus->name; | |
2713 | else | |
798efc60 | 2714 | return 0; |
c4e00daa | 2715 | |
798efc60 | 2716 | pos += snprintf(hdr + pos, hdrlen - pos, "SUBSYSTEM=%s", subsys); |
655e5b7c BH |
2717 | if (pos >= hdrlen) |
2718 | goto overflow; | |
c4e00daa KS |
2719 | |
2720 | /* | |
2721 | * Add device identifier DEVICE=: | |
2722 | * b12:8 block dev_t | |
2723 | * c127:3 char dev_t | |
2724 | * n8 netdev ifindex | |
2725 | * +sound:card0 subsystem:devname | |
2726 | */ | |
2727 | if (MAJOR(dev->devt)) { | |
2728 | char c; | |
2729 | ||
2730 | if (strcmp(subsys, "block") == 0) | |
2731 | c = 'b'; | |
2732 | else | |
2733 | c = 'c'; | |
798efc60 JP |
2734 | pos++; |
2735 | pos += snprintf(hdr + pos, hdrlen - pos, | |
2736 | "DEVICE=%c%u:%u", | |
2737 | c, MAJOR(dev->devt), MINOR(dev->devt)); | |
c4e00daa KS |
2738 | } else if (strcmp(subsys, "net") == 0) { |
2739 | struct net_device *net = to_net_dev(dev); | |
2740 | ||
798efc60 JP |
2741 | pos++; |
2742 | pos += snprintf(hdr + pos, hdrlen - pos, | |
2743 | "DEVICE=n%u", net->ifindex); | |
c4e00daa | 2744 | } else { |
798efc60 JP |
2745 | pos++; |
2746 | pos += snprintf(hdr + pos, hdrlen - pos, | |
2747 | "DEVICE=+%s:%s", subsys, dev_name(dev)); | |
c4e00daa | 2748 | } |
af7f2158 | 2749 | |
655e5b7c BH |
2750 | if (pos >= hdrlen) |
2751 | goto overflow; | |
2752 | ||
798efc60 | 2753 | return pos; |
655e5b7c BH |
2754 | |
2755 | overflow: | |
2756 | dev_WARN(dev, "device/subsystem name too long"); | |
2757 | return 0; | |
798efc60 | 2758 | } |
798efc60 | 2759 | |
05e4e5b8 JP |
2760 | int dev_vprintk_emit(int level, const struct device *dev, |
2761 | const char *fmt, va_list args) | |
2762 | { | |
2763 | char hdr[128]; | |
2764 | size_t hdrlen; | |
2765 | ||
2766 | hdrlen = create_syslog_header(dev, hdr, sizeof(hdr)); | |
2767 | ||
2768 | return vprintk_emit(0, level, hdrlen ? hdr : NULL, hdrlen, fmt, args); | |
2769 | } | |
2770 | EXPORT_SYMBOL(dev_vprintk_emit); | |
2771 | ||
2772 | int dev_printk_emit(int level, const struct device *dev, const char *fmt, ...) | |
2773 | { | |
2774 | va_list args; | |
2775 | int r; | |
2776 | ||
2777 | va_start(args, fmt); | |
2778 | ||
2779 | r = dev_vprintk_emit(level, dev, fmt, args); | |
2780 | ||
2781 | va_end(args); | |
2782 | ||
2783 | return r; | |
2784 | } | |
2785 | EXPORT_SYMBOL(dev_printk_emit); | |
2786 | ||
d1f1052c | 2787 | static void __dev_printk(const char *level, const struct device *dev, |
798efc60 JP |
2788 | struct va_format *vaf) |
2789 | { | |
d1f1052c JP |
2790 | if (dev) |
2791 | dev_printk_emit(level[1] - '0', dev, "%s %s: %pV", | |
2792 | dev_driver_string(dev), dev_name(dev), vaf); | |
2793 | else | |
2794 | printk("%s(NULL device *): %pV", level, vaf); | |
99bcf217 JP |
2795 | } |
2796 | ||
d1f1052c JP |
2797 | void dev_printk(const char *level, const struct device *dev, |
2798 | const char *fmt, ...) | |
99bcf217 JP |
2799 | { |
2800 | struct va_format vaf; | |
2801 | va_list args; | |
99bcf217 JP |
2802 | |
2803 | va_start(args, fmt); | |
2804 | ||
2805 | vaf.fmt = fmt; | |
2806 | vaf.va = &args; | |
2807 | ||
d1f1052c | 2808 | __dev_printk(level, dev, &vaf); |
798efc60 | 2809 | |
99bcf217 | 2810 | va_end(args); |
99bcf217 JP |
2811 | } |
2812 | EXPORT_SYMBOL(dev_printk); | |
2813 | ||
2814 | #define define_dev_printk_level(func, kern_level) \ | |
d1f1052c | 2815 | void func(const struct device *dev, const char *fmt, ...) \ |
99bcf217 JP |
2816 | { \ |
2817 | struct va_format vaf; \ | |
2818 | va_list args; \ | |
99bcf217 JP |
2819 | \ |
2820 | va_start(args, fmt); \ | |
2821 | \ | |
2822 | vaf.fmt = fmt; \ | |
2823 | vaf.va = &args; \ | |
2824 | \ | |
d1f1052c | 2825 | __dev_printk(kern_level, dev, &vaf); \ |
798efc60 | 2826 | \ |
99bcf217 | 2827 | va_end(args); \ |
99bcf217 JP |
2828 | } \ |
2829 | EXPORT_SYMBOL(func); | |
2830 | ||
2831 | define_dev_printk_level(dev_emerg, KERN_EMERG); | |
2832 | define_dev_printk_level(dev_alert, KERN_ALERT); | |
2833 | define_dev_printk_level(dev_crit, KERN_CRIT); | |
2834 | define_dev_printk_level(dev_err, KERN_ERR); | |
2835 | define_dev_printk_level(dev_warn, KERN_WARNING); | |
2836 | define_dev_printk_level(dev_notice, KERN_NOTICE); | |
2837 | define_dev_printk_level(_dev_info, KERN_INFO); | |
2838 | ||
2839 | #endif | |
97badf87 RW |
2840 | |
2841 | static inline bool fwnode_is_primary(struct fwnode_handle *fwnode) | |
2842 | { | |
2843 | return fwnode && !IS_ERR(fwnode->secondary); | |
2844 | } | |
2845 | ||
2846 | /** | |
2847 | * set_primary_fwnode - Change the primary firmware node of a given device. | |
2848 | * @dev: Device to handle. | |
2849 | * @fwnode: New primary firmware node of the device. | |
2850 | * | |
2851 | * Set the device's firmware node pointer to @fwnode, but if a secondary | |
2852 | * firmware node of the device is present, preserve it. | |
2853 | */ | |
2854 | void set_primary_fwnode(struct device *dev, struct fwnode_handle *fwnode) | |
2855 | { | |
2856 | if (fwnode) { | |
2857 | struct fwnode_handle *fn = dev->fwnode; | |
2858 | ||
2859 | if (fwnode_is_primary(fn)) | |
2860 | fn = fn->secondary; | |
2861 | ||
55f89a8a MW |
2862 | if (fn) { |
2863 | WARN_ON(fwnode->secondary); | |
2864 | fwnode->secondary = fn; | |
2865 | } | |
97badf87 RW |
2866 | dev->fwnode = fwnode; |
2867 | } else { | |
2868 | dev->fwnode = fwnode_is_primary(dev->fwnode) ? | |
2869 | dev->fwnode->secondary : NULL; | |
2870 | } | |
2871 | } | |
2872 | EXPORT_SYMBOL_GPL(set_primary_fwnode); | |
2873 | ||
2874 | /** | |
2875 | * set_secondary_fwnode - Change the secondary firmware node of a given device. | |
2876 | * @dev: Device to handle. | |
2877 | * @fwnode: New secondary firmware node of the device. | |
2878 | * | |
2879 | * If a primary firmware node of the device is present, set its secondary | |
2880 | * pointer to @fwnode. Otherwise, set the device's firmware node pointer to | |
2881 | * @fwnode. | |
2882 | */ | |
2883 | void set_secondary_fwnode(struct device *dev, struct fwnode_handle *fwnode) | |
2884 | { | |
2885 | if (fwnode) | |
2886 | fwnode->secondary = ERR_PTR(-ENODEV); | |
2887 | ||
2888 | if (fwnode_is_primary(dev->fwnode)) | |
2889 | dev->fwnode->secondary = fwnode; | |
2890 | else | |
2891 | dev->fwnode = fwnode; | |
2892 | } |