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989d42e8 | 1 | // SPDX-License-Identifier: GPL-2.0 |
1da177e4 LT |
2 | /* |
3 | * drivers/base/core.c - core driver model code (device registration, etc) | |
4 | * | |
5 | * Copyright (c) 2002-3 Patrick Mochel | |
6 | * Copyright (c) 2002-3 Open Source Development Labs | |
64bb5d2c GKH |
7 | * Copyright (c) 2006 Greg Kroah-Hartman <gregkh@suse.de> |
8 | * Copyright (c) 2006 Novell, Inc. | |
1da177e4 LT |
9 | */ |
10 | ||
7847a145 | 11 | #include <linux/acpi.h> |
1da177e4 LT |
12 | #include <linux/device.h> |
13 | #include <linux/err.h> | |
97badf87 | 14 | #include <linux/fwnode.h> |
1da177e4 LT |
15 | #include <linux/init.h> |
16 | #include <linux/module.h> | |
17 | #include <linux/slab.h> | |
18 | #include <linux/string.h> | |
23681e47 | 19 | #include <linux/kdev_t.h> |
116af378 | 20 | #include <linux/notifier.h> |
07d57a32 GL |
21 | #include <linux/of.h> |
22 | #include <linux/of_device.h> | |
da231fd5 | 23 | #include <linux/genhd.h> |
f75b1c60 | 24 | #include <linux/mutex.h> |
af8db150 | 25 | #include <linux/pm_runtime.h> |
c4e00daa | 26 | #include <linux/netdevice.h> |
174cd4b1 | 27 | #include <linux/sched/signal.h> |
63967685 | 28 | #include <linux/sysfs.h> |
1da177e4 LT |
29 | |
30 | #include "base.h" | |
31 | #include "power/power.h" | |
32 | ||
e52eec13 AK |
33 | #ifdef CONFIG_SYSFS_DEPRECATED |
34 | #ifdef CONFIG_SYSFS_DEPRECATED_V2 | |
35 | long sysfs_deprecated = 1; | |
36 | #else | |
37 | long sysfs_deprecated = 0; | |
38 | #endif | |
3454bf96 | 39 | static int __init sysfs_deprecated_setup(char *arg) |
e52eec13 | 40 | { |
34da5e67 | 41 | return kstrtol(arg, 10, &sysfs_deprecated); |
e52eec13 AK |
42 | } |
43 | early_param("sysfs.deprecated", sysfs_deprecated_setup); | |
44 | #endif | |
45 | ||
9ed98953 RW |
46 | /* Device links support. */ |
47 | ||
48 | #ifdef CONFIG_SRCU | |
49 | static DEFINE_MUTEX(device_links_lock); | |
50 | DEFINE_STATIC_SRCU(device_links_srcu); | |
51 | ||
52 | static inline void device_links_write_lock(void) | |
53 | { | |
54 | mutex_lock(&device_links_lock); | |
55 | } | |
56 | ||
57 | static inline void device_links_write_unlock(void) | |
58 | { | |
59 | mutex_unlock(&device_links_lock); | |
60 | } | |
61 | ||
62 | int device_links_read_lock(void) | |
63 | { | |
64 | return srcu_read_lock(&device_links_srcu); | |
65 | } | |
66 | ||
67 | void device_links_read_unlock(int idx) | |
68 | { | |
69 | srcu_read_unlock(&device_links_srcu, idx); | |
70 | } | |
71 | #else /* !CONFIG_SRCU */ | |
72 | static DECLARE_RWSEM(device_links_lock); | |
73 | ||
74 | static inline void device_links_write_lock(void) | |
75 | { | |
76 | down_write(&device_links_lock); | |
77 | } | |
78 | ||
79 | static inline void device_links_write_unlock(void) | |
80 | { | |
81 | up_write(&device_links_lock); | |
82 | } | |
83 | ||
84 | int device_links_read_lock(void) | |
85 | { | |
86 | down_read(&device_links_lock); | |
87 | return 0; | |
88 | } | |
89 | ||
90 | void device_links_read_unlock(int not_used) | |
91 | { | |
92 | up_read(&device_links_lock); | |
93 | } | |
94 | #endif /* !CONFIG_SRCU */ | |
95 | ||
96 | /** | |
97 | * device_is_dependent - Check if one device depends on another one | |
98 | * @dev: Device to check dependencies for. | |
99 | * @target: Device to check against. | |
100 | * | |
101 | * Check if @target depends on @dev or any device dependent on it (its child or | |
102 | * its consumer etc). Return 1 if that is the case or 0 otherwise. | |
103 | */ | |
104 | static int device_is_dependent(struct device *dev, void *target) | |
105 | { | |
106 | struct device_link *link; | |
107 | int ret; | |
108 | ||
e16f4f3e | 109 | if (dev == target) |
9ed98953 RW |
110 | return 1; |
111 | ||
112 | ret = device_for_each_child(dev, target, device_is_dependent); | |
113 | if (ret) | |
114 | return ret; | |
115 | ||
116 | list_for_each_entry(link, &dev->links.consumers, s_node) { | |
e16f4f3e | 117 | if (link->consumer == target) |
9ed98953 RW |
118 | return 1; |
119 | ||
120 | ret = device_is_dependent(link->consumer, target); | |
121 | if (ret) | |
122 | break; | |
123 | } | |
124 | return ret; | |
125 | } | |
126 | ||
127 | static int device_reorder_to_tail(struct device *dev, void *not_used) | |
128 | { | |
129 | struct device_link *link; | |
130 | ||
131 | /* | |
132 | * Devices that have not been registered yet will be put to the ends | |
133 | * of the lists during the registration, so skip them here. | |
134 | */ | |
135 | if (device_is_registered(dev)) | |
136 | devices_kset_move_last(dev); | |
137 | ||
138 | if (device_pm_initialized(dev)) | |
139 | device_pm_move_last(dev); | |
140 | ||
141 | device_for_each_child(dev, NULL, device_reorder_to_tail); | |
142 | list_for_each_entry(link, &dev->links.consumers, s_node) | |
143 | device_reorder_to_tail(link->consumer, NULL); | |
144 | ||
145 | return 0; | |
146 | } | |
147 | ||
494fd7b7 FK |
148 | /** |
149 | * device_pm_move_to_tail - Move set of devices to the end of device lists | |
150 | * @dev: Device to move | |
151 | * | |
152 | * This is a device_reorder_to_tail() wrapper taking the requisite locks. | |
153 | * | |
154 | * It moves the @dev along with all of its children and all of its consumers | |
155 | * to the ends of the device_kset and dpm_list, recursively. | |
156 | */ | |
157 | void device_pm_move_to_tail(struct device *dev) | |
158 | { | |
159 | int idx; | |
160 | ||
161 | idx = device_links_read_lock(); | |
162 | device_pm_lock(); | |
163 | device_reorder_to_tail(dev, NULL); | |
164 | device_pm_unlock(); | |
165 | device_links_read_unlock(idx); | |
166 | } | |
167 | ||
9ed98953 RW |
168 | /** |
169 | * device_link_add - Create a link between two devices. | |
170 | * @consumer: Consumer end of the link. | |
171 | * @supplier: Supplier end of the link. | |
172 | * @flags: Link flags. | |
173 | * | |
21d5c57b RW |
174 | * The caller is responsible for the proper synchronization of the link creation |
175 | * with runtime PM. First, setting the DL_FLAG_PM_RUNTIME flag will cause the | |
176 | * runtime PM framework to take the link into account. Second, if the | |
177 | * DL_FLAG_RPM_ACTIVE flag is set in addition to it, the supplier devices will | |
178 | * be forced into the active metastate and reference-counted upon the creation | |
179 | * of the link. If DL_FLAG_PM_RUNTIME is not set, DL_FLAG_RPM_ACTIVE will be | |
180 | * ignored. | |
181 | * | |
72175d4e RW |
182 | * If DL_FLAG_STATELESS is set in @flags, the link is not going to be managed by |
183 | * the driver core and, in particular, the caller of this function is expected | |
184 | * to drop the reference to the link acquired by it directly. | |
185 | * | |
186 | * If that flag is not set, however, the caller of this function is handing the | |
187 | * management of the link over to the driver core entirely and its return value | |
188 | * can only be used to check whether or not the link is present. In that case, | |
189 | * the DL_FLAG_AUTOREMOVE_CONSUMER and DL_FLAG_AUTOREMOVE_SUPPLIER device link | |
190 | * flags can be used to indicate to the driver core when the link can be safely | |
191 | * deleted. Namely, setting one of them in @flags indicates to the driver core | |
192 | * that the link is not going to be used (by the given caller of this function) | |
193 | * after unbinding the consumer or supplier driver, respectively, from its | |
194 | * device, so the link can be deleted at that point. If none of them is set, | |
195 | * the link will be maintained until one of the devices pointed to by it (either | |
196 | * the consumer or the supplier) is unregistered. | |
c8d50986 | 197 | * |
e7dd4010 RW |
198 | * Also, if DL_FLAG_STATELESS, DL_FLAG_AUTOREMOVE_CONSUMER and |
199 | * DL_FLAG_AUTOREMOVE_SUPPLIER are not set in @flags (that is, a persistent | |
200 | * managed device link is being added), the DL_FLAG_AUTOPROBE_CONSUMER flag can | |
201 | * be used to request the driver core to automaticall probe for a consmer | |
202 | * driver after successfully binding a driver to the supplier device. | |
203 | * | |
c8d50986 RW |
204 | * The combination of DL_FLAG_STATELESS and either DL_FLAG_AUTOREMOVE_CONSUMER |
205 | * or DL_FLAG_AUTOREMOVE_SUPPLIER set in @flags at the same time is invalid and | |
206 | * will cause NULL to be returned upfront. | |
9ed98953 RW |
207 | * |
208 | * A side effect of the link creation is re-ordering of dpm_list and the | |
209 | * devices_kset list by moving the consumer device and all devices depending | |
210 | * on it to the ends of these lists (that does not happen to devices that have | |
211 | * not been registered when this function is called). | |
212 | * | |
213 | * The supplier device is required to be registered when this function is called | |
214 | * and NULL will be returned if that is not the case. The consumer device need | |
64df1148 | 215 | * not be registered, however. |
9ed98953 RW |
216 | */ |
217 | struct device_link *device_link_add(struct device *consumer, | |
218 | struct device *supplier, u32 flags) | |
219 | { | |
220 | struct device_link *link; | |
221 | ||
222 | if (!consumer || !supplier || | |
c8d50986 | 223 | (flags & DL_FLAG_STATELESS && |
e7dd4010 RW |
224 | flags & (DL_FLAG_AUTOREMOVE_CONSUMER | |
225 | DL_FLAG_AUTOREMOVE_SUPPLIER | | |
226 | DL_FLAG_AUTOPROBE_CONSUMER)) || | |
227 | (flags & DL_FLAG_AUTOPROBE_CONSUMER && | |
228 | flags & (DL_FLAG_AUTOREMOVE_CONSUMER | | |
229 | DL_FLAG_AUTOREMOVE_SUPPLIER))) | |
9ed98953 RW |
230 | return NULL; |
231 | ||
5db25c9e RW |
232 | if (flags & DL_FLAG_PM_RUNTIME && flags & DL_FLAG_RPM_ACTIVE) { |
233 | if (pm_runtime_get_sync(supplier) < 0) { | |
234 | pm_runtime_put_noidle(supplier); | |
235 | return NULL; | |
236 | } | |
5db25c9e RW |
237 | } |
238 | ||
9ed98953 RW |
239 | device_links_write_lock(); |
240 | device_pm_lock(); | |
241 | ||
242 | /* | |
243 | * If the supplier has not been fully registered yet or there is a | |
244 | * reverse dependency between the consumer and the supplier already in | |
245 | * the graph, return NULL. | |
246 | */ | |
247 | if (!device_pm_initialized(supplier) | |
248 | || device_is_dependent(consumer, supplier)) { | |
249 | link = NULL; | |
250 | goto out; | |
251 | } | |
252 | ||
72175d4e RW |
253 | /* |
254 | * DL_FLAG_AUTOREMOVE_SUPPLIER indicates that the link will be needed | |
255 | * longer than for DL_FLAG_AUTOREMOVE_CONSUMER and setting them both | |
256 | * together doesn't make sense, so prefer DL_FLAG_AUTOREMOVE_SUPPLIER. | |
257 | */ | |
258 | if (flags & DL_FLAG_AUTOREMOVE_SUPPLIER) | |
259 | flags &= ~DL_FLAG_AUTOREMOVE_CONSUMER; | |
260 | ||
f265df55 RW |
261 | list_for_each_entry(link, &supplier->links.consumers, s_node) { |
262 | if (link->consumer != consumer) | |
263 | continue; | |
264 | ||
265 | /* | |
266 | * Don't return a stateless link if the caller wants a stateful | |
267 | * one and vice versa. | |
268 | */ | |
269 | if (WARN_ON((flags & DL_FLAG_STATELESS) != (link->flags & DL_FLAG_STATELESS))) { | |
270 | link = NULL; | |
9ed98953 | 271 | goto out; |
ead18c23 | 272 | } |
9ed98953 | 273 | |
e2f3cd83 RW |
274 | if (flags & DL_FLAG_PM_RUNTIME) { |
275 | if (!(link->flags & DL_FLAG_PM_RUNTIME)) { | |
4c06c4e6 | 276 | pm_runtime_new_link(consumer); |
e2f3cd83 RW |
277 | link->flags |= DL_FLAG_PM_RUNTIME; |
278 | } | |
279 | if (flags & DL_FLAG_RPM_ACTIVE) | |
36003d4c | 280 | refcount_inc(&link->rpm_active); |
e2f3cd83 RW |
281 | } |
282 | ||
72175d4e RW |
283 | if (flags & DL_FLAG_STATELESS) { |
284 | kref_get(&link->kref); | |
285 | goto out; | |
286 | } | |
287 | ||
288 | /* | |
289 | * If the life time of the link following from the new flags is | |
290 | * longer than indicated by the flags of the existing link, | |
291 | * update the existing link to stay around longer. | |
292 | */ | |
293 | if (flags & DL_FLAG_AUTOREMOVE_SUPPLIER) { | |
294 | if (link->flags & DL_FLAG_AUTOREMOVE_CONSUMER) { | |
295 | link->flags &= ~DL_FLAG_AUTOREMOVE_CONSUMER; | |
296 | link->flags |= DL_FLAG_AUTOREMOVE_SUPPLIER; | |
297 | } | |
298 | } else if (!(flags & DL_FLAG_AUTOREMOVE_CONSUMER)) { | |
299 | link->flags &= ~(DL_FLAG_AUTOREMOVE_CONSUMER | | |
300 | DL_FLAG_AUTOREMOVE_SUPPLIER); | |
301 | } | |
f265df55 RW |
302 | goto out; |
303 | } | |
304 | ||
21d5c57b | 305 | link = kzalloc(sizeof(*link), GFP_KERNEL); |
9ed98953 RW |
306 | if (!link) |
307 | goto out; | |
308 | ||
e2f3cd83 RW |
309 | refcount_set(&link->rpm_active, 1); |
310 | ||
baa8809f | 311 | if (flags & DL_FLAG_PM_RUNTIME) { |
e2f3cd83 | 312 | if (flags & DL_FLAG_RPM_ACTIVE) |
36003d4c | 313 | refcount_inc(&link->rpm_active); |
e2f3cd83 | 314 | |
4c06c4e6 | 315 | pm_runtime_new_link(consumer); |
21d5c57b | 316 | } |
e2f3cd83 | 317 | |
9ed98953 RW |
318 | get_device(supplier); |
319 | link->supplier = supplier; | |
320 | INIT_LIST_HEAD(&link->s_node); | |
321 | get_device(consumer); | |
322 | link->consumer = consumer; | |
323 | INIT_LIST_HEAD(&link->c_node); | |
324 | link->flags = flags; | |
ead18c23 | 325 | kref_init(&link->kref); |
9ed98953 | 326 | |
64df1148 | 327 | /* Determine the initial link state. */ |
9ed98953 RW |
328 | if (flags & DL_FLAG_STATELESS) { |
329 | link->status = DL_STATE_NONE; | |
330 | } else { | |
331 | switch (supplier->links.status) { | |
15cfb094 | 332 | case DL_DEV_PROBING: |
9ed98953 RW |
333 | switch (consumer->links.status) { |
334 | case DL_DEV_PROBING: | |
21d5c57b | 335 | /* |
15cfb094 RW |
336 | * A consumer driver can create a link to a |
337 | * supplier that has not completed its probing | |
338 | * yet as long as it knows that the supplier is | |
339 | * already functional (for example, it has just | |
340 | * acquired some resources from the supplier). | |
21d5c57b | 341 | */ |
15cfb094 RW |
342 | link->status = DL_STATE_CONSUMER_PROBE; |
343 | break; | |
344 | default: | |
345 | link->status = DL_STATE_DORMANT; | |
346 | break; | |
347 | } | |
348 | break; | |
349 | case DL_DEV_DRIVER_BOUND: | |
350 | switch (consumer->links.status) { | |
351 | case DL_DEV_PROBING: | |
9ed98953 RW |
352 | link->status = DL_STATE_CONSUMER_PROBE; |
353 | break; | |
354 | case DL_DEV_DRIVER_BOUND: | |
355 | link->status = DL_STATE_ACTIVE; | |
356 | break; | |
357 | default: | |
358 | link->status = DL_STATE_AVAILABLE; | |
359 | break; | |
360 | } | |
361 | break; | |
362 | case DL_DEV_UNBINDING: | |
363 | link->status = DL_STATE_SUPPLIER_UNBIND; | |
364 | break; | |
365 | default: | |
366 | link->status = DL_STATE_DORMANT; | |
367 | break; | |
368 | } | |
369 | } | |
370 | ||
15cfb094 RW |
371 | /* |
372 | * Some callers expect the link creation during consumer driver probe to | |
373 | * resume the supplier even without DL_FLAG_RPM_ACTIVE. | |
374 | */ | |
375 | if (link->status == DL_STATE_CONSUMER_PROBE && | |
376 | flags & DL_FLAG_PM_RUNTIME) | |
377 | pm_runtime_resume(supplier); | |
378 | ||
9ed98953 RW |
379 | /* |
380 | * Move the consumer and all of the devices depending on it to the end | |
381 | * of dpm_list and the devices_kset list. | |
382 | * | |
383 | * It is necessary to hold dpm_list locked throughout all that or else | |
384 | * we may end up suspending with a wrong ordering of it. | |
385 | */ | |
386 | device_reorder_to_tail(consumer, NULL); | |
387 | ||
388 | list_add_tail_rcu(&link->s_node, &supplier->links.consumers); | |
389 | list_add_tail_rcu(&link->c_node, &consumer->links.suppliers); | |
390 | ||
8a4b3269 | 391 | dev_dbg(consumer, "Linked as a consumer to %s\n", dev_name(supplier)); |
9ed98953 RW |
392 | |
393 | out: | |
394 | device_pm_unlock(); | |
395 | device_links_write_unlock(); | |
5db25c9e | 396 | |
e2f3cd83 | 397 | if ((flags & DL_FLAG_PM_RUNTIME && flags & DL_FLAG_RPM_ACTIVE) && !link) |
5db25c9e RW |
398 | pm_runtime_put(supplier); |
399 | ||
9ed98953 RW |
400 | return link; |
401 | } | |
402 | EXPORT_SYMBOL_GPL(device_link_add); | |
403 | ||
404 | static void device_link_free(struct device_link *link) | |
405 | { | |
a1fdbfbb RW |
406 | while (refcount_dec_not_one(&link->rpm_active)) |
407 | pm_runtime_put(link->supplier); | |
408 | ||
9ed98953 RW |
409 | put_device(link->consumer); |
410 | put_device(link->supplier); | |
411 | kfree(link); | |
412 | } | |
413 | ||
414 | #ifdef CONFIG_SRCU | |
415 | static void __device_link_free_srcu(struct rcu_head *rhead) | |
416 | { | |
417 | device_link_free(container_of(rhead, struct device_link, rcu_head)); | |
418 | } | |
419 | ||
ead18c23 | 420 | static void __device_link_del(struct kref *kref) |
9ed98953 | 421 | { |
ead18c23 LW |
422 | struct device_link *link = container_of(kref, struct device_link, kref); |
423 | ||
8a4b3269 JB |
424 | dev_dbg(link->consumer, "Dropping the link to %s\n", |
425 | dev_name(link->supplier)); | |
9ed98953 | 426 | |
baa8809f RW |
427 | if (link->flags & DL_FLAG_PM_RUNTIME) |
428 | pm_runtime_drop_link(link->consumer); | |
429 | ||
9ed98953 RW |
430 | list_del_rcu(&link->s_node); |
431 | list_del_rcu(&link->c_node); | |
432 | call_srcu(&device_links_srcu, &link->rcu_head, __device_link_free_srcu); | |
433 | } | |
434 | #else /* !CONFIG_SRCU */ | |
ead18c23 | 435 | static void __device_link_del(struct kref *kref) |
9ed98953 | 436 | { |
ead18c23 LW |
437 | struct device_link *link = container_of(kref, struct device_link, kref); |
438 | ||
9ed98953 RW |
439 | dev_info(link->consumer, "Dropping the link to %s\n", |
440 | dev_name(link->supplier)); | |
441 | ||
433986c2 LW |
442 | if (link->flags & DL_FLAG_PM_RUNTIME) |
443 | pm_runtime_drop_link(link->consumer); | |
444 | ||
9ed98953 RW |
445 | list_del(&link->s_node); |
446 | list_del(&link->c_node); | |
447 | device_link_free(link); | |
448 | } | |
449 | #endif /* !CONFIG_SRCU */ | |
450 | ||
72175d4e RW |
451 | static void device_link_put_kref(struct device_link *link) |
452 | { | |
453 | if (link->flags & DL_FLAG_STATELESS) | |
454 | kref_put(&link->kref, __device_link_del); | |
455 | else | |
456 | WARN(1, "Unable to drop a managed device link reference\n"); | |
457 | } | |
458 | ||
9ed98953 | 459 | /** |
72175d4e | 460 | * device_link_del - Delete a stateless link between two devices. |
9ed98953 RW |
461 | * @link: Device link to delete. |
462 | * | |
463 | * The caller must ensure proper synchronization of this function with runtime | |
ead18c23 LW |
464 | * PM. If the link was added multiple times, it needs to be deleted as often. |
465 | * Care is required for hotplugged devices: Their links are purged on removal | |
466 | * and calling device_link_del() is then no longer allowed. | |
9ed98953 RW |
467 | */ |
468 | void device_link_del(struct device_link *link) | |
469 | { | |
470 | device_links_write_lock(); | |
471 | device_pm_lock(); | |
72175d4e | 472 | device_link_put_kref(link); |
9ed98953 RW |
473 | device_pm_unlock(); |
474 | device_links_write_unlock(); | |
475 | } | |
476 | EXPORT_SYMBOL_GPL(device_link_del); | |
477 | ||
d8842211 | 478 | /** |
72175d4e | 479 | * device_link_remove - Delete a stateless link between two devices. |
d8842211 | 480 | * @consumer: Consumer end of the link. |
481 | * @supplier: Supplier end of the link. | |
482 | * | |
483 | * The caller must ensure proper synchronization of this function with runtime | |
484 | * PM. | |
485 | */ | |
486 | void device_link_remove(void *consumer, struct device *supplier) | |
487 | { | |
488 | struct device_link *link; | |
489 | ||
490 | if (WARN_ON(consumer == supplier)) | |
491 | return; | |
492 | ||
493 | device_links_write_lock(); | |
494 | device_pm_lock(); | |
495 | ||
496 | list_for_each_entry(link, &supplier->links.consumers, s_node) { | |
497 | if (link->consumer == consumer) { | |
72175d4e | 498 | device_link_put_kref(link); |
d8842211 | 499 | break; |
500 | } | |
501 | } | |
502 | ||
503 | device_pm_unlock(); | |
504 | device_links_write_unlock(); | |
505 | } | |
506 | EXPORT_SYMBOL_GPL(device_link_remove); | |
507 | ||
9ed98953 RW |
508 | static void device_links_missing_supplier(struct device *dev) |
509 | { | |
510 | struct device_link *link; | |
511 | ||
512 | list_for_each_entry(link, &dev->links.suppliers, c_node) | |
513 | if (link->status == DL_STATE_CONSUMER_PROBE) | |
514 | WRITE_ONCE(link->status, DL_STATE_AVAILABLE); | |
515 | } | |
516 | ||
517 | /** | |
518 | * device_links_check_suppliers - Check presence of supplier drivers. | |
519 | * @dev: Consumer device. | |
520 | * | |
521 | * Check links from this device to any suppliers. Walk the list of the device's | |
522 | * links to suppliers and see if all of them are available. If not, simply | |
523 | * return -EPROBE_DEFER. | |
524 | * | |
525 | * We need to guarantee that the supplier will not go away after the check has | |
526 | * been positive here. It only can go away in __device_release_driver() and | |
527 | * that function checks the device's links to consumers. This means we need to | |
528 | * mark the link as "consumer probe in progress" to make the supplier removal | |
529 | * wait for us to complete (or bad things may happen). | |
530 | * | |
531 | * Links with the DL_FLAG_STATELESS flag set are ignored. | |
532 | */ | |
533 | int device_links_check_suppliers(struct device *dev) | |
534 | { | |
535 | struct device_link *link; | |
536 | int ret = 0; | |
537 | ||
538 | device_links_write_lock(); | |
539 | ||
540 | list_for_each_entry(link, &dev->links.suppliers, c_node) { | |
541 | if (link->flags & DL_FLAG_STATELESS) | |
542 | continue; | |
543 | ||
544 | if (link->status != DL_STATE_AVAILABLE) { | |
545 | device_links_missing_supplier(dev); | |
546 | ret = -EPROBE_DEFER; | |
547 | break; | |
548 | } | |
549 | WRITE_ONCE(link->status, DL_STATE_CONSUMER_PROBE); | |
550 | } | |
551 | dev->links.status = DL_DEV_PROBING; | |
552 | ||
553 | device_links_write_unlock(); | |
554 | return ret; | |
555 | } | |
556 | ||
557 | /** | |
558 | * device_links_driver_bound - Update device links after probing its driver. | |
559 | * @dev: Device to update the links for. | |
560 | * | |
561 | * The probe has been successful, so update links from this device to any | |
562 | * consumers by changing their status to "available". | |
563 | * | |
564 | * Also change the status of @dev's links to suppliers to "active". | |
565 | * | |
566 | * Links with the DL_FLAG_STATELESS flag set are ignored. | |
567 | */ | |
568 | void device_links_driver_bound(struct device *dev) | |
569 | { | |
570 | struct device_link *link; | |
571 | ||
572 | device_links_write_lock(); | |
573 | ||
574 | list_for_each_entry(link, &dev->links.consumers, s_node) { | |
575 | if (link->flags & DL_FLAG_STATELESS) | |
576 | continue; | |
577 | ||
15cfb094 RW |
578 | /* |
579 | * Links created during consumer probe may be in the "consumer | |
580 | * probe" state to start with if the supplier is still probing | |
581 | * when they are created and they may become "active" if the | |
582 | * consumer probe returns first. Skip them here. | |
583 | */ | |
584 | if (link->status == DL_STATE_CONSUMER_PROBE || | |
585 | link->status == DL_STATE_ACTIVE) | |
586 | continue; | |
587 | ||
9ed98953 RW |
588 | WARN_ON(link->status != DL_STATE_DORMANT); |
589 | WRITE_ONCE(link->status, DL_STATE_AVAILABLE); | |
e7dd4010 RW |
590 | |
591 | if (link->flags & DL_FLAG_AUTOPROBE_CONSUMER) | |
592 | driver_deferred_probe_add(link->consumer); | |
9ed98953 RW |
593 | } |
594 | ||
595 | list_for_each_entry(link, &dev->links.suppliers, c_node) { | |
596 | if (link->flags & DL_FLAG_STATELESS) | |
597 | continue; | |
598 | ||
599 | WARN_ON(link->status != DL_STATE_CONSUMER_PROBE); | |
600 | WRITE_ONCE(link->status, DL_STATE_ACTIVE); | |
601 | } | |
602 | ||
603 | dev->links.status = DL_DEV_DRIVER_BOUND; | |
604 | ||
605 | device_links_write_unlock(); | |
606 | } | |
607 | ||
608 | /** | |
609 | * __device_links_no_driver - Update links of a device without a driver. | |
610 | * @dev: Device without a drvier. | |
611 | * | |
612 | * Delete all non-persistent links from this device to any suppliers. | |
613 | * | |
614 | * Persistent links stay around, but their status is changed to "available", | |
615 | * unless they already are in the "supplier unbind in progress" state in which | |
616 | * case they need not be updated. | |
617 | * | |
618 | * Links with the DL_FLAG_STATELESS flag set are ignored. | |
619 | */ | |
620 | static void __device_links_no_driver(struct device *dev) | |
621 | { | |
622 | struct device_link *link, *ln; | |
623 | ||
624 | list_for_each_entry_safe_reverse(link, ln, &dev->links.suppliers, c_node) { | |
625 | if (link->flags & DL_FLAG_STATELESS) | |
626 | continue; | |
627 | ||
e88728f4 | 628 | if (link->flags & DL_FLAG_AUTOREMOVE_CONSUMER) |
0fe6f787 | 629 | __device_link_del(&link->kref); |
15cfb094 RW |
630 | else if (link->status == DL_STATE_CONSUMER_PROBE || |
631 | link->status == DL_STATE_ACTIVE) | |
9ed98953 RW |
632 | WRITE_ONCE(link->status, DL_STATE_AVAILABLE); |
633 | } | |
634 | ||
635 | dev->links.status = DL_DEV_NO_DRIVER; | |
636 | } | |
637 | ||
15cfb094 RW |
638 | /** |
639 | * device_links_no_driver - Update links after failing driver probe. | |
640 | * @dev: Device whose driver has just failed to probe. | |
641 | * | |
642 | * Clean up leftover links to consumers for @dev and invoke | |
643 | * %__device_links_no_driver() to update links to suppliers for it as | |
644 | * appropriate. | |
645 | * | |
646 | * Links with the DL_FLAG_STATELESS flag set are ignored. | |
647 | */ | |
9ed98953 RW |
648 | void device_links_no_driver(struct device *dev) |
649 | { | |
15cfb094 RW |
650 | struct device_link *link; |
651 | ||
9ed98953 | 652 | device_links_write_lock(); |
15cfb094 RW |
653 | |
654 | list_for_each_entry(link, &dev->links.consumers, s_node) { | |
655 | if (link->flags & DL_FLAG_STATELESS) | |
656 | continue; | |
657 | ||
658 | /* | |
659 | * The probe has failed, so if the status of the link is | |
660 | * "consumer probe" or "active", it must have been added by | |
661 | * a probing consumer while this device was still probing. | |
662 | * Change its state to "dormant", as it represents a valid | |
663 | * relationship, but it is not functionally meaningful. | |
664 | */ | |
665 | if (link->status == DL_STATE_CONSUMER_PROBE || | |
666 | link->status == DL_STATE_ACTIVE) | |
667 | WRITE_ONCE(link->status, DL_STATE_DORMANT); | |
668 | } | |
669 | ||
9ed98953 | 670 | __device_links_no_driver(dev); |
15cfb094 | 671 | |
9ed98953 RW |
672 | device_links_write_unlock(); |
673 | } | |
674 | ||
675 | /** | |
676 | * device_links_driver_cleanup - Update links after driver removal. | |
677 | * @dev: Device whose driver has just gone away. | |
678 | * | |
679 | * Update links to consumers for @dev by changing their status to "dormant" and | |
680 | * invoke %__device_links_no_driver() to update links to suppliers for it as | |
681 | * appropriate. | |
682 | * | |
683 | * Links with the DL_FLAG_STATELESS flag set are ignored. | |
684 | */ | |
685 | void device_links_driver_cleanup(struct device *dev) | |
686 | { | |
c8d50986 | 687 | struct device_link *link, *ln; |
9ed98953 RW |
688 | |
689 | device_links_write_lock(); | |
690 | ||
c8d50986 | 691 | list_for_each_entry_safe(link, ln, &dev->links.consumers, s_node) { |
9ed98953 RW |
692 | if (link->flags & DL_FLAG_STATELESS) |
693 | continue; | |
694 | ||
e88728f4 | 695 | WARN_ON(link->flags & DL_FLAG_AUTOREMOVE_CONSUMER); |
9ed98953 | 696 | WARN_ON(link->status != DL_STATE_SUPPLIER_UNBIND); |
1689cac5 VG |
697 | |
698 | /* | |
699 | * autoremove the links between this @dev and its consumer | |
700 | * devices that are not active, i.e. where the link state | |
701 | * has moved to DL_STATE_SUPPLIER_UNBIND. | |
702 | */ | |
703 | if (link->status == DL_STATE_SUPPLIER_UNBIND && | |
704 | link->flags & DL_FLAG_AUTOREMOVE_SUPPLIER) | |
0fe6f787 | 705 | __device_link_del(&link->kref); |
1689cac5 | 706 | |
9ed98953 RW |
707 | WRITE_ONCE(link->status, DL_STATE_DORMANT); |
708 | } | |
709 | ||
710 | __device_links_no_driver(dev); | |
711 | ||
712 | device_links_write_unlock(); | |
713 | } | |
714 | ||
715 | /** | |
716 | * device_links_busy - Check if there are any busy links to consumers. | |
717 | * @dev: Device to check. | |
718 | * | |
719 | * Check each consumer of the device and return 'true' if its link's status | |
720 | * is one of "consumer probe" or "active" (meaning that the given consumer is | |
721 | * probing right now or its driver is present). Otherwise, change the link | |
722 | * state to "supplier unbind" to prevent the consumer from being probed | |
723 | * successfully going forward. | |
724 | * | |
725 | * Return 'false' if there are no probing or active consumers. | |
726 | * | |
727 | * Links with the DL_FLAG_STATELESS flag set are ignored. | |
728 | */ | |
729 | bool device_links_busy(struct device *dev) | |
730 | { | |
731 | struct device_link *link; | |
732 | bool ret = false; | |
733 | ||
734 | device_links_write_lock(); | |
735 | ||
736 | list_for_each_entry(link, &dev->links.consumers, s_node) { | |
737 | if (link->flags & DL_FLAG_STATELESS) | |
738 | continue; | |
739 | ||
740 | if (link->status == DL_STATE_CONSUMER_PROBE | |
741 | || link->status == DL_STATE_ACTIVE) { | |
742 | ret = true; | |
743 | break; | |
744 | } | |
745 | WRITE_ONCE(link->status, DL_STATE_SUPPLIER_UNBIND); | |
746 | } | |
747 | ||
748 | dev->links.status = DL_DEV_UNBINDING; | |
749 | ||
750 | device_links_write_unlock(); | |
751 | return ret; | |
752 | } | |
753 | ||
754 | /** | |
755 | * device_links_unbind_consumers - Force unbind consumers of the given device. | |
756 | * @dev: Device to unbind the consumers of. | |
757 | * | |
758 | * Walk the list of links to consumers for @dev and if any of them is in the | |
759 | * "consumer probe" state, wait for all device probes in progress to complete | |
760 | * and start over. | |
761 | * | |
762 | * If that's not the case, change the status of the link to "supplier unbind" | |
763 | * and check if the link was in the "active" state. If so, force the consumer | |
764 | * driver to unbind and start over (the consumer will not re-probe as we have | |
765 | * changed the state of the link already). | |
766 | * | |
767 | * Links with the DL_FLAG_STATELESS flag set are ignored. | |
768 | */ | |
769 | void device_links_unbind_consumers(struct device *dev) | |
770 | { | |
771 | struct device_link *link; | |
772 | ||
773 | start: | |
774 | device_links_write_lock(); | |
775 | ||
776 | list_for_each_entry(link, &dev->links.consumers, s_node) { | |
777 | enum device_link_state status; | |
778 | ||
779 | if (link->flags & DL_FLAG_STATELESS) | |
780 | continue; | |
781 | ||
782 | status = link->status; | |
783 | if (status == DL_STATE_CONSUMER_PROBE) { | |
784 | device_links_write_unlock(); | |
785 | ||
786 | wait_for_device_probe(); | |
787 | goto start; | |
788 | } | |
789 | WRITE_ONCE(link->status, DL_STATE_SUPPLIER_UNBIND); | |
790 | if (status == DL_STATE_ACTIVE) { | |
791 | struct device *consumer = link->consumer; | |
792 | ||
793 | get_device(consumer); | |
794 | ||
795 | device_links_write_unlock(); | |
796 | ||
797 | device_release_driver_internal(consumer, NULL, | |
798 | consumer->parent); | |
799 | put_device(consumer); | |
800 | goto start; | |
801 | } | |
802 | } | |
803 | ||
804 | device_links_write_unlock(); | |
805 | } | |
806 | ||
807 | /** | |
808 | * device_links_purge - Delete existing links to other devices. | |
809 | * @dev: Target device. | |
810 | */ | |
811 | static void device_links_purge(struct device *dev) | |
812 | { | |
813 | struct device_link *link, *ln; | |
814 | ||
815 | /* | |
816 | * Delete all of the remaining links from this device to any other | |
817 | * devices (either consumers or suppliers). | |
818 | */ | |
819 | device_links_write_lock(); | |
820 | ||
821 | list_for_each_entry_safe_reverse(link, ln, &dev->links.suppliers, c_node) { | |
822 | WARN_ON(link->status == DL_STATE_ACTIVE); | |
ead18c23 | 823 | __device_link_del(&link->kref); |
9ed98953 RW |
824 | } |
825 | ||
826 | list_for_each_entry_safe_reverse(link, ln, &dev->links.consumers, s_node) { | |
827 | WARN_ON(link->status != DL_STATE_DORMANT && | |
828 | link->status != DL_STATE_NONE); | |
ead18c23 | 829 | __device_link_del(&link->kref); |
9ed98953 RW |
830 | } |
831 | ||
832 | device_links_write_unlock(); | |
833 | } | |
834 | ||
835 | /* Device links support end. */ | |
836 | ||
4a3ad20c GKH |
837 | int (*platform_notify)(struct device *dev) = NULL; |
838 | int (*platform_notify_remove)(struct device *dev) = NULL; | |
e105b8bf DW |
839 | static struct kobject *dev_kobj; |
840 | struct kobject *sysfs_dev_char_kobj; | |
841 | struct kobject *sysfs_dev_block_kobj; | |
1da177e4 | 842 | |
5e33bc41 RW |
843 | static DEFINE_MUTEX(device_hotplug_lock); |
844 | ||
845 | void lock_device_hotplug(void) | |
846 | { | |
847 | mutex_lock(&device_hotplug_lock); | |
848 | } | |
849 | ||
850 | void unlock_device_hotplug(void) | |
851 | { | |
852 | mutex_unlock(&device_hotplug_lock); | |
853 | } | |
854 | ||
855 | int lock_device_hotplug_sysfs(void) | |
856 | { | |
857 | if (mutex_trylock(&device_hotplug_lock)) | |
858 | return 0; | |
859 | ||
860 | /* Avoid busy looping (5 ms of sleep should do). */ | |
861 | msleep(5); | |
862 | return restart_syscall(); | |
863 | } | |
864 | ||
4e886c29 GKH |
865 | #ifdef CONFIG_BLOCK |
866 | static inline int device_is_not_partition(struct device *dev) | |
867 | { | |
868 | return !(dev->type == &part_type); | |
869 | } | |
870 | #else | |
871 | static inline int device_is_not_partition(struct device *dev) | |
872 | { | |
873 | return 1; | |
874 | } | |
875 | #endif | |
1da177e4 | 876 | |
07de0e86 HK |
877 | static int |
878 | device_platform_notify(struct device *dev, enum kobject_action action) | |
879 | { | |
7847a145 HK |
880 | int ret; |
881 | ||
882 | ret = acpi_platform_notify(dev, action); | |
883 | if (ret) | |
884 | return ret; | |
885 | ||
59abd836 HK |
886 | ret = software_node_notify(dev, action); |
887 | if (ret) | |
888 | return ret; | |
889 | ||
07de0e86 HK |
890 | if (platform_notify && action == KOBJ_ADD) |
891 | platform_notify(dev); | |
892 | else if (platform_notify_remove && action == KOBJ_REMOVE) | |
893 | platform_notify_remove(dev); | |
894 | return 0; | |
895 | } | |
896 | ||
3e95637a AS |
897 | /** |
898 | * dev_driver_string - Return a device's driver name, if at all possible | |
899 | * @dev: struct device to get the name of | |
900 | * | |
901 | * Will return the device's driver's name if it is bound to a device. If | |
9169c012 | 902 | * the device is not bound to a driver, it will return the name of the bus |
3e95637a AS |
903 | * it is attached to. If it is not attached to a bus either, an empty |
904 | * string will be returned. | |
905 | */ | |
bf9ca69f | 906 | const char *dev_driver_string(const struct device *dev) |
3e95637a | 907 | { |
3589972e AS |
908 | struct device_driver *drv; |
909 | ||
910 | /* dev->driver can change to NULL underneath us because of unbinding, | |
911 | * so be careful about accessing it. dev->bus and dev->class should | |
912 | * never change once they are set, so they don't need special care. | |
913 | */ | |
6aa7de05 | 914 | drv = READ_ONCE(dev->driver); |
3589972e | 915 | return drv ? drv->name : |
a456b702 JD |
916 | (dev->bus ? dev->bus->name : |
917 | (dev->class ? dev->class->name : "")); | |
3e95637a | 918 | } |
310a922d | 919 | EXPORT_SYMBOL(dev_driver_string); |
3e95637a | 920 | |
1da177e4 LT |
921 | #define to_dev_attr(_attr) container_of(_attr, struct device_attribute, attr) |
922 | ||
4a3ad20c GKH |
923 | static ssize_t dev_attr_show(struct kobject *kobj, struct attribute *attr, |
924 | char *buf) | |
1da177e4 | 925 | { |
4a3ad20c | 926 | struct device_attribute *dev_attr = to_dev_attr(attr); |
b0d1f807 | 927 | struct device *dev = kobj_to_dev(kobj); |
4a0c20bf | 928 | ssize_t ret = -EIO; |
1da177e4 LT |
929 | |
930 | if (dev_attr->show) | |
54b6f35c | 931 | ret = dev_attr->show(dev, dev_attr, buf); |
815d2d50 | 932 | if (ret >= (ssize_t)PAGE_SIZE) { |
a52668c6 SS |
933 | printk("dev_attr_show: %pS returned bad count\n", |
934 | dev_attr->show); | |
815d2d50 | 935 | } |
1da177e4 LT |
936 | return ret; |
937 | } | |
938 | ||
4a3ad20c GKH |
939 | static ssize_t dev_attr_store(struct kobject *kobj, struct attribute *attr, |
940 | const char *buf, size_t count) | |
1da177e4 | 941 | { |
4a3ad20c | 942 | struct device_attribute *dev_attr = to_dev_attr(attr); |
b0d1f807 | 943 | struct device *dev = kobj_to_dev(kobj); |
4a0c20bf | 944 | ssize_t ret = -EIO; |
1da177e4 LT |
945 | |
946 | if (dev_attr->store) | |
54b6f35c | 947 | ret = dev_attr->store(dev, dev_attr, buf, count); |
1da177e4 LT |
948 | return ret; |
949 | } | |
950 | ||
52cf25d0 | 951 | static const struct sysfs_ops dev_sysfs_ops = { |
1da177e4 LT |
952 | .show = dev_attr_show, |
953 | .store = dev_attr_store, | |
954 | }; | |
955 | ||
ca22e56d KS |
956 | #define to_ext_attr(x) container_of(x, struct dev_ext_attribute, attr) |
957 | ||
958 | ssize_t device_store_ulong(struct device *dev, | |
959 | struct device_attribute *attr, | |
960 | const char *buf, size_t size) | |
961 | { | |
962 | struct dev_ext_attribute *ea = to_ext_attr(attr); | |
f88184bf K |
963 | int ret; |
964 | unsigned long new; | |
965 | ||
966 | ret = kstrtoul(buf, 0, &new); | |
967 | if (ret) | |
968 | return ret; | |
ca22e56d KS |
969 | *(unsigned long *)(ea->var) = new; |
970 | /* Always return full write size even if we didn't consume all */ | |
971 | return size; | |
972 | } | |
973 | EXPORT_SYMBOL_GPL(device_store_ulong); | |
974 | ||
975 | ssize_t device_show_ulong(struct device *dev, | |
976 | struct device_attribute *attr, | |
977 | char *buf) | |
978 | { | |
979 | struct dev_ext_attribute *ea = to_ext_attr(attr); | |
980 | return snprintf(buf, PAGE_SIZE, "%lx\n", *(unsigned long *)(ea->var)); | |
981 | } | |
982 | EXPORT_SYMBOL_GPL(device_show_ulong); | |
983 | ||
984 | ssize_t device_store_int(struct device *dev, | |
985 | struct device_attribute *attr, | |
986 | const char *buf, size_t size) | |
987 | { | |
988 | struct dev_ext_attribute *ea = to_ext_attr(attr); | |
f88184bf K |
989 | int ret; |
990 | long new; | |
991 | ||
992 | ret = kstrtol(buf, 0, &new); | |
993 | if (ret) | |
994 | return ret; | |
995 | ||
996 | if (new > INT_MAX || new < INT_MIN) | |
ca22e56d KS |
997 | return -EINVAL; |
998 | *(int *)(ea->var) = new; | |
999 | /* Always return full write size even if we didn't consume all */ | |
1000 | return size; | |
1001 | } | |
1002 | EXPORT_SYMBOL_GPL(device_store_int); | |
1003 | ||
1004 | ssize_t device_show_int(struct device *dev, | |
1005 | struct device_attribute *attr, | |
1006 | char *buf) | |
1007 | { | |
1008 | struct dev_ext_attribute *ea = to_ext_attr(attr); | |
1009 | ||
1010 | return snprintf(buf, PAGE_SIZE, "%d\n", *(int *)(ea->var)); | |
1011 | } | |
1012 | EXPORT_SYMBOL_GPL(device_show_int); | |
1da177e4 | 1013 | |
91872392 BP |
1014 | ssize_t device_store_bool(struct device *dev, struct device_attribute *attr, |
1015 | const char *buf, size_t size) | |
1016 | { | |
1017 | struct dev_ext_attribute *ea = to_ext_attr(attr); | |
1018 | ||
1019 | if (strtobool(buf, ea->var) < 0) | |
1020 | return -EINVAL; | |
1021 | ||
1022 | return size; | |
1023 | } | |
1024 | EXPORT_SYMBOL_GPL(device_store_bool); | |
1025 | ||
1026 | ssize_t device_show_bool(struct device *dev, struct device_attribute *attr, | |
1027 | char *buf) | |
1028 | { | |
1029 | struct dev_ext_attribute *ea = to_ext_attr(attr); | |
1030 | ||
1031 | return snprintf(buf, PAGE_SIZE, "%d\n", *(bool *)(ea->var)); | |
1032 | } | |
1033 | EXPORT_SYMBOL_GPL(device_show_bool); | |
1034 | ||
1da177e4 | 1035 | /** |
f8878dcb RD |
1036 | * device_release - free device structure. |
1037 | * @kobj: device's kobject. | |
1da177e4 | 1038 | * |
f8878dcb RD |
1039 | * This is called once the reference count for the object |
1040 | * reaches 0. We forward the call to the device's release | |
1041 | * method, which should handle actually freeing the structure. | |
1da177e4 | 1042 | */ |
4a3ad20c | 1043 | static void device_release(struct kobject *kobj) |
1da177e4 | 1044 | { |
b0d1f807 | 1045 | struct device *dev = kobj_to_dev(kobj); |
fb069a5d | 1046 | struct device_private *p = dev->p; |
1da177e4 | 1047 | |
a525a3dd ML |
1048 | /* |
1049 | * Some platform devices are driven without driver attached | |
1050 | * and managed resources may have been acquired. Make sure | |
1051 | * all resources are released. | |
1052 | * | |
1053 | * Drivers still can add resources into device after device | |
1054 | * is deleted but alive, so release devres here to avoid | |
1055 | * possible memory leak. | |
1056 | */ | |
1057 | devres_release_all(dev); | |
1058 | ||
1da177e4 LT |
1059 | if (dev->release) |
1060 | dev->release(dev); | |
f9f852df KS |
1061 | else if (dev->type && dev->type->release) |
1062 | dev->type->release(dev); | |
2620efef GKH |
1063 | else if (dev->class && dev->class->dev_release) |
1064 | dev->class->dev_release(dev); | |
f810a5cf | 1065 | else |
186bddb2 | 1066 | WARN(1, KERN_ERR "Device '%s' does not have a release() function, it is broken and must be fixed. See Documentation/kobject.txt.\n", |
1e0b2cf9 | 1067 | dev_name(dev)); |
fb069a5d | 1068 | kfree(p); |
1da177e4 LT |
1069 | } |
1070 | ||
bc451f20 EB |
1071 | static const void *device_namespace(struct kobject *kobj) |
1072 | { | |
b0d1f807 | 1073 | struct device *dev = kobj_to_dev(kobj); |
bc451f20 EB |
1074 | const void *ns = NULL; |
1075 | ||
1076 | if (dev->class && dev->class->ns_type) | |
1077 | ns = dev->class->namespace(dev); | |
1078 | ||
1079 | return ns; | |
1080 | } | |
1081 | ||
9944e894 DT |
1082 | static void device_get_ownership(struct kobject *kobj, kuid_t *uid, kgid_t *gid) |
1083 | { | |
1084 | struct device *dev = kobj_to_dev(kobj); | |
1085 | ||
1086 | if (dev->class && dev->class->get_ownership) | |
1087 | dev->class->get_ownership(dev, uid, gid); | |
1088 | } | |
1089 | ||
8f4afc41 | 1090 | static struct kobj_type device_ktype = { |
1da177e4 LT |
1091 | .release = device_release, |
1092 | .sysfs_ops = &dev_sysfs_ops, | |
bc451f20 | 1093 | .namespace = device_namespace, |
9944e894 | 1094 | .get_ownership = device_get_ownership, |
1da177e4 LT |
1095 | }; |
1096 | ||
1097 | ||
312c004d | 1098 | static int dev_uevent_filter(struct kset *kset, struct kobject *kobj) |
1da177e4 LT |
1099 | { |
1100 | struct kobj_type *ktype = get_ktype(kobj); | |
1101 | ||
8f4afc41 | 1102 | if (ktype == &device_ktype) { |
b0d1f807 | 1103 | struct device *dev = kobj_to_dev(kobj); |
1da177e4 LT |
1104 | if (dev->bus) |
1105 | return 1; | |
23681e47 GKH |
1106 | if (dev->class) |
1107 | return 1; | |
1da177e4 LT |
1108 | } |
1109 | return 0; | |
1110 | } | |
1111 | ||
312c004d | 1112 | static const char *dev_uevent_name(struct kset *kset, struct kobject *kobj) |
1da177e4 | 1113 | { |
b0d1f807 | 1114 | struct device *dev = kobj_to_dev(kobj); |
1da177e4 | 1115 | |
23681e47 GKH |
1116 | if (dev->bus) |
1117 | return dev->bus->name; | |
1118 | if (dev->class) | |
1119 | return dev->class->name; | |
1120 | return NULL; | |
1da177e4 LT |
1121 | } |
1122 | ||
7eff2e7a KS |
1123 | static int dev_uevent(struct kset *kset, struct kobject *kobj, |
1124 | struct kobj_uevent_env *env) | |
1da177e4 | 1125 | { |
b0d1f807 | 1126 | struct device *dev = kobj_to_dev(kobj); |
1da177e4 LT |
1127 | int retval = 0; |
1128 | ||
6fcf53ac | 1129 | /* add device node properties if present */ |
23681e47 | 1130 | if (MAJOR(dev->devt)) { |
6fcf53ac KS |
1131 | const char *tmp; |
1132 | const char *name; | |
2c9ede55 | 1133 | umode_t mode = 0; |
4e4098a3 GKH |
1134 | kuid_t uid = GLOBAL_ROOT_UID; |
1135 | kgid_t gid = GLOBAL_ROOT_GID; | |
6fcf53ac | 1136 | |
7eff2e7a KS |
1137 | add_uevent_var(env, "MAJOR=%u", MAJOR(dev->devt)); |
1138 | add_uevent_var(env, "MINOR=%u", MINOR(dev->devt)); | |
3c2670e6 | 1139 | name = device_get_devnode(dev, &mode, &uid, &gid, &tmp); |
6fcf53ac KS |
1140 | if (name) { |
1141 | add_uevent_var(env, "DEVNAME=%s", name); | |
e454cea2 KS |
1142 | if (mode) |
1143 | add_uevent_var(env, "DEVMODE=%#o", mode & 0777); | |
4e4098a3 GKH |
1144 | if (!uid_eq(uid, GLOBAL_ROOT_UID)) |
1145 | add_uevent_var(env, "DEVUID=%u", from_kuid(&init_user_ns, uid)); | |
1146 | if (!gid_eq(gid, GLOBAL_ROOT_GID)) | |
1147 | add_uevent_var(env, "DEVGID=%u", from_kgid(&init_user_ns, gid)); | |
3c2670e6 | 1148 | kfree(tmp); |
6fcf53ac | 1149 | } |
23681e47 GKH |
1150 | } |
1151 | ||
414264f9 | 1152 | if (dev->type && dev->type->name) |
7eff2e7a | 1153 | add_uevent_var(env, "DEVTYPE=%s", dev->type->name); |
414264f9 | 1154 | |
239378f1 | 1155 | if (dev->driver) |
7eff2e7a | 1156 | add_uevent_var(env, "DRIVER=%s", dev->driver->name); |
239378f1 | 1157 | |
07d57a32 GL |
1158 | /* Add common DT information about the device */ |
1159 | of_device_uevent(dev, env); | |
1160 | ||
7eff2e7a | 1161 | /* have the bus specific function add its stuff */ |
312c004d | 1162 | if (dev->bus && dev->bus->uevent) { |
7eff2e7a | 1163 | retval = dev->bus->uevent(dev, env); |
f9f852df | 1164 | if (retval) |
7dc72b28 | 1165 | pr_debug("device: '%s': %s: bus uevent() returned %d\n", |
1e0b2cf9 | 1166 | dev_name(dev), __func__, retval); |
1da177e4 LT |
1167 | } |
1168 | ||
7eff2e7a | 1169 | /* have the class specific function add its stuff */ |
2620efef | 1170 | if (dev->class && dev->class->dev_uevent) { |
7eff2e7a | 1171 | retval = dev->class->dev_uevent(dev, env); |
f9f852df | 1172 | if (retval) |
7dc72b28 | 1173 | pr_debug("device: '%s': %s: class uevent() " |
1e0b2cf9 | 1174 | "returned %d\n", dev_name(dev), |
2b3a302a | 1175 | __func__, retval); |
f9f852df KS |
1176 | } |
1177 | ||
eef35c2d | 1178 | /* have the device type specific function add its stuff */ |
f9f852df | 1179 | if (dev->type && dev->type->uevent) { |
7eff2e7a | 1180 | retval = dev->type->uevent(dev, env); |
f9f852df | 1181 | if (retval) |
7dc72b28 | 1182 | pr_debug("device: '%s': %s: dev_type uevent() " |
1e0b2cf9 | 1183 | "returned %d\n", dev_name(dev), |
2b3a302a | 1184 | __func__, retval); |
2620efef GKH |
1185 | } |
1186 | ||
1da177e4 LT |
1187 | return retval; |
1188 | } | |
1189 | ||
9cd43611 | 1190 | static const struct kset_uevent_ops device_uevent_ops = { |
312c004d KS |
1191 | .filter = dev_uevent_filter, |
1192 | .name = dev_uevent_name, | |
1193 | .uevent = dev_uevent, | |
1da177e4 LT |
1194 | }; |
1195 | ||
c5e064a6 | 1196 | static ssize_t uevent_show(struct device *dev, struct device_attribute *attr, |
16574dcc KS |
1197 | char *buf) |
1198 | { | |
1199 | struct kobject *top_kobj; | |
1200 | struct kset *kset; | |
7eff2e7a | 1201 | struct kobj_uevent_env *env = NULL; |
16574dcc KS |
1202 | int i; |
1203 | size_t count = 0; | |
1204 | int retval; | |
1205 | ||
1206 | /* search the kset, the device belongs to */ | |
1207 | top_kobj = &dev->kobj; | |
5c5daf65 KS |
1208 | while (!top_kobj->kset && top_kobj->parent) |
1209 | top_kobj = top_kobj->parent; | |
16574dcc KS |
1210 | if (!top_kobj->kset) |
1211 | goto out; | |
5c5daf65 | 1212 | |
16574dcc KS |
1213 | kset = top_kobj->kset; |
1214 | if (!kset->uevent_ops || !kset->uevent_ops->uevent) | |
1215 | goto out; | |
1216 | ||
1217 | /* respect filter */ | |
1218 | if (kset->uevent_ops && kset->uevent_ops->filter) | |
1219 | if (!kset->uevent_ops->filter(kset, &dev->kobj)) | |
1220 | goto out; | |
1221 | ||
7eff2e7a KS |
1222 | env = kzalloc(sizeof(struct kobj_uevent_env), GFP_KERNEL); |
1223 | if (!env) | |
c7308c81 GKH |
1224 | return -ENOMEM; |
1225 | ||
16574dcc | 1226 | /* let the kset specific function add its keys */ |
7eff2e7a | 1227 | retval = kset->uevent_ops->uevent(kset, &dev->kobj, env); |
16574dcc KS |
1228 | if (retval) |
1229 | goto out; | |
1230 | ||
1231 | /* copy keys to file */ | |
7eff2e7a KS |
1232 | for (i = 0; i < env->envp_idx; i++) |
1233 | count += sprintf(&buf[count], "%s\n", env->envp[i]); | |
16574dcc | 1234 | out: |
7eff2e7a | 1235 | kfree(env); |
16574dcc KS |
1236 | return count; |
1237 | } | |
1238 | ||
c5e064a6 | 1239 | static ssize_t uevent_store(struct device *dev, struct device_attribute *attr, |
a7fd6706 KS |
1240 | const char *buf, size_t count) |
1241 | { | |
df44b479 PR |
1242 | int rc; |
1243 | ||
1244 | rc = kobject_synth_uevent(&dev->kobj, buf, count); | |
1245 | ||
1246 | if (rc) { | |
f36776fa | 1247 | dev_err(dev, "uevent: failed to send synthetic uevent\n"); |
df44b479 PR |
1248 | return rc; |
1249 | } | |
60a96a59 | 1250 | |
a7fd6706 KS |
1251 | return count; |
1252 | } | |
c5e064a6 | 1253 | static DEVICE_ATTR_RW(uevent); |
a7fd6706 | 1254 | |
c5e064a6 | 1255 | static ssize_t online_show(struct device *dev, struct device_attribute *attr, |
4f3549d7 RW |
1256 | char *buf) |
1257 | { | |
1258 | bool val; | |
1259 | ||
5e33bc41 | 1260 | device_lock(dev); |
4f3549d7 | 1261 | val = !dev->offline; |
5e33bc41 | 1262 | device_unlock(dev); |
4f3549d7 RW |
1263 | return sprintf(buf, "%u\n", val); |
1264 | } | |
1265 | ||
c5e064a6 | 1266 | static ssize_t online_store(struct device *dev, struct device_attribute *attr, |
4f3549d7 RW |
1267 | const char *buf, size_t count) |
1268 | { | |
1269 | bool val; | |
1270 | int ret; | |
1271 | ||
1272 | ret = strtobool(buf, &val); | |
1273 | if (ret < 0) | |
1274 | return ret; | |
1275 | ||
5e33bc41 RW |
1276 | ret = lock_device_hotplug_sysfs(); |
1277 | if (ret) | |
1278 | return ret; | |
1279 | ||
4f3549d7 RW |
1280 | ret = val ? device_online(dev) : device_offline(dev); |
1281 | unlock_device_hotplug(); | |
1282 | return ret < 0 ? ret : count; | |
1283 | } | |
c5e064a6 | 1284 | static DEVICE_ATTR_RW(online); |
4f3549d7 | 1285 | |
fa6fdb33 | 1286 | int device_add_groups(struct device *dev, const struct attribute_group **groups) |
621a1672 | 1287 | { |
3e9b2bae | 1288 | return sysfs_create_groups(&dev->kobj, groups); |
de0ff00d | 1289 | } |
a7670d42 | 1290 | EXPORT_SYMBOL_GPL(device_add_groups); |
de0ff00d | 1291 | |
fa6fdb33 GKH |
1292 | void device_remove_groups(struct device *dev, |
1293 | const struct attribute_group **groups) | |
de0ff00d | 1294 | { |
3e9b2bae | 1295 | sysfs_remove_groups(&dev->kobj, groups); |
de0ff00d | 1296 | } |
a7670d42 | 1297 | EXPORT_SYMBOL_GPL(device_remove_groups); |
de0ff00d | 1298 | |
57b8ff07 DT |
1299 | union device_attr_group_devres { |
1300 | const struct attribute_group *group; | |
1301 | const struct attribute_group **groups; | |
1302 | }; | |
1303 | ||
1304 | static int devm_attr_group_match(struct device *dev, void *res, void *data) | |
1305 | { | |
1306 | return ((union device_attr_group_devres *)res)->group == data; | |
1307 | } | |
1308 | ||
1309 | static void devm_attr_group_remove(struct device *dev, void *res) | |
1310 | { | |
1311 | union device_attr_group_devres *devres = res; | |
1312 | const struct attribute_group *group = devres->group; | |
1313 | ||
1314 | dev_dbg(dev, "%s: removing group %p\n", __func__, group); | |
1315 | sysfs_remove_group(&dev->kobj, group); | |
1316 | } | |
1317 | ||
1318 | static void devm_attr_groups_remove(struct device *dev, void *res) | |
1319 | { | |
1320 | union device_attr_group_devres *devres = res; | |
1321 | const struct attribute_group **groups = devres->groups; | |
1322 | ||
1323 | dev_dbg(dev, "%s: removing groups %p\n", __func__, groups); | |
1324 | sysfs_remove_groups(&dev->kobj, groups); | |
1325 | } | |
1326 | ||
1327 | /** | |
1328 | * devm_device_add_group - given a device, create a managed attribute group | |
1329 | * @dev: The device to create the group for | |
1330 | * @grp: The attribute group to create | |
1331 | * | |
1332 | * This function creates a group for the first time. It will explicitly | |
1333 | * warn and error if any of the attribute files being created already exist. | |
1334 | * | |
1335 | * Returns 0 on success or error code on failure. | |
1336 | */ | |
1337 | int devm_device_add_group(struct device *dev, const struct attribute_group *grp) | |
1338 | { | |
1339 | union device_attr_group_devres *devres; | |
1340 | int error; | |
1341 | ||
1342 | devres = devres_alloc(devm_attr_group_remove, | |
1343 | sizeof(*devres), GFP_KERNEL); | |
1344 | if (!devres) | |
1345 | return -ENOMEM; | |
1346 | ||
1347 | error = sysfs_create_group(&dev->kobj, grp); | |
1348 | if (error) { | |
1349 | devres_free(devres); | |
1350 | return error; | |
1351 | } | |
1352 | ||
1353 | devres->group = grp; | |
1354 | devres_add(dev, devres); | |
1355 | return 0; | |
1356 | } | |
1357 | EXPORT_SYMBOL_GPL(devm_device_add_group); | |
1358 | ||
1359 | /** | |
1360 | * devm_device_remove_group: remove a managed group from a device | |
1361 | * @dev: device to remove the group from | |
1362 | * @grp: group to remove | |
1363 | * | |
1364 | * This function removes a group of attributes from a device. The attributes | |
1365 | * previously have to have been created for this group, otherwise it will fail. | |
1366 | */ | |
1367 | void devm_device_remove_group(struct device *dev, | |
1368 | const struct attribute_group *grp) | |
1369 | { | |
1370 | WARN_ON(devres_release(dev, devm_attr_group_remove, | |
1371 | devm_attr_group_match, | |
1372 | /* cast away const */ (void *)grp)); | |
1373 | } | |
1374 | EXPORT_SYMBOL_GPL(devm_device_remove_group); | |
1375 | ||
1376 | /** | |
1377 | * devm_device_add_groups - create a bunch of managed attribute groups | |
1378 | * @dev: The device to create the group for | |
1379 | * @groups: The attribute groups to create, NULL terminated | |
1380 | * | |
1381 | * This function creates a bunch of managed attribute groups. If an error | |
1382 | * occurs when creating a group, all previously created groups will be | |
1383 | * removed, unwinding everything back to the original state when this | |
1384 | * function was called. It will explicitly warn and error if any of the | |
1385 | * attribute files being created already exist. | |
1386 | * | |
1387 | * Returns 0 on success or error code from sysfs_create_group on failure. | |
1388 | */ | |
1389 | int devm_device_add_groups(struct device *dev, | |
1390 | const struct attribute_group **groups) | |
1391 | { | |
1392 | union device_attr_group_devres *devres; | |
1393 | int error; | |
1394 | ||
1395 | devres = devres_alloc(devm_attr_groups_remove, | |
1396 | sizeof(*devres), GFP_KERNEL); | |
1397 | if (!devres) | |
1398 | return -ENOMEM; | |
1399 | ||
1400 | error = sysfs_create_groups(&dev->kobj, groups); | |
1401 | if (error) { | |
1402 | devres_free(devres); | |
1403 | return error; | |
1404 | } | |
1405 | ||
1406 | devres->groups = groups; | |
1407 | devres_add(dev, devres); | |
1408 | return 0; | |
1409 | } | |
1410 | EXPORT_SYMBOL_GPL(devm_device_add_groups); | |
1411 | ||
1412 | /** | |
1413 | * devm_device_remove_groups - remove a list of managed groups | |
1414 | * | |
1415 | * @dev: The device for the groups to be removed from | |
1416 | * @groups: NULL terminated list of groups to be removed | |
1417 | * | |
1418 | * If groups is not NULL, remove the specified groups from the device. | |
1419 | */ | |
1420 | void devm_device_remove_groups(struct device *dev, | |
1421 | const struct attribute_group **groups) | |
1422 | { | |
1423 | WARN_ON(devres_release(dev, devm_attr_groups_remove, | |
1424 | devm_attr_group_match, | |
1425 | /* cast away const */ (void *)groups)); | |
1426 | } | |
1427 | EXPORT_SYMBOL_GPL(devm_device_remove_groups); | |
de0ff00d | 1428 | |
2620efef GKH |
1429 | static int device_add_attrs(struct device *dev) |
1430 | { | |
1431 | struct class *class = dev->class; | |
aed65af1 | 1432 | const struct device_type *type = dev->type; |
621a1672 | 1433 | int error; |
2620efef | 1434 | |
621a1672 | 1435 | if (class) { |
d05a6f96 | 1436 | error = device_add_groups(dev, class->dev_groups); |
f9f852df | 1437 | if (error) |
621a1672 | 1438 | return error; |
2620efef | 1439 | } |
f9f852df | 1440 | |
621a1672 DT |
1441 | if (type) { |
1442 | error = device_add_groups(dev, type->groups); | |
f9f852df | 1443 | if (error) |
a6b01ded | 1444 | goto err_remove_class_groups; |
f9f852df KS |
1445 | } |
1446 | ||
621a1672 DT |
1447 | error = device_add_groups(dev, dev->groups); |
1448 | if (error) | |
1449 | goto err_remove_type_groups; | |
1450 | ||
4f3549d7 | 1451 | if (device_supports_offline(dev) && !dev->offline_disabled) { |
c5e064a6 | 1452 | error = device_create_file(dev, &dev_attr_online); |
4f3549d7 | 1453 | if (error) |
ecfbf6fd | 1454 | goto err_remove_dev_groups; |
4f3549d7 RW |
1455 | } |
1456 | ||
621a1672 DT |
1457 | return 0; |
1458 | ||
ecfbf6fd RW |
1459 | err_remove_dev_groups: |
1460 | device_remove_groups(dev, dev->groups); | |
621a1672 DT |
1461 | err_remove_type_groups: |
1462 | if (type) | |
1463 | device_remove_groups(dev, type->groups); | |
d05a6f96 GKH |
1464 | err_remove_class_groups: |
1465 | if (class) | |
1466 | device_remove_groups(dev, class->dev_groups); | |
621a1672 | 1467 | |
2620efef GKH |
1468 | return error; |
1469 | } | |
1470 | ||
1471 | static void device_remove_attrs(struct device *dev) | |
1472 | { | |
1473 | struct class *class = dev->class; | |
aed65af1 | 1474 | const struct device_type *type = dev->type; |
2620efef | 1475 | |
c5e064a6 | 1476 | device_remove_file(dev, &dev_attr_online); |
621a1672 | 1477 | device_remove_groups(dev, dev->groups); |
f9f852df | 1478 | |
621a1672 DT |
1479 | if (type) |
1480 | device_remove_groups(dev, type->groups); | |
1481 | ||
a6b01ded | 1482 | if (class) |
d05a6f96 | 1483 | device_remove_groups(dev, class->dev_groups); |
2620efef GKH |
1484 | } |
1485 | ||
c5e064a6 | 1486 | static ssize_t dev_show(struct device *dev, struct device_attribute *attr, |
23681e47 GKH |
1487 | char *buf) |
1488 | { | |
1489 | return print_dev_t(buf, dev->devt); | |
1490 | } | |
c5e064a6 | 1491 | static DEVICE_ATTR_RO(dev); |
ad6a1e1c | 1492 | |
ca22e56d | 1493 | /* /sys/devices/ */ |
881c6cfd | 1494 | struct kset *devices_kset; |
1da177e4 | 1495 | |
52cdbdd4 GS |
1496 | /** |
1497 | * devices_kset_move_before - Move device in the devices_kset's list. | |
1498 | * @deva: Device to move. | |
1499 | * @devb: Device @deva should come before. | |
1500 | */ | |
1501 | static void devices_kset_move_before(struct device *deva, struct device *devb) | |
1502 | { | |
1503 | if (!devices_kset) | |
1504 | return; | |
1505 | pr_debug("devices_kset: Moving %s before %s\n", | |
1506 | dev_name(deva), dev_name(devb)); | |
1507 | spin_lock(&devices_kset->list_lock); | |
1508 | list_move_tail(&deva->kobj.entry, &devb->kobj.entry); | |
1509 | spin_unlock(&devices_kset->list_lock); | |
1510 | } | |
1511 | ||
1512 | /** | |
1513 | * devices_kset_move_after - Move device in the devices_kset's list. | |
1514 | * @deva: Device to move | |
1515 | * @devb: Device @deva should come after. | |
1516 | */ | |
1517 | static void devices_kset_move_after(struct device *deva, struct device *devb) | |
1518 | { | |
1519 | if (!devices_kset) | |
1520 | return; | |
1521 | pr_debug("devices_kset: Moving %s after %s\n", | |
1522 | dev_name(deva), dev_name(devb)); | |
1523 | spin_lock(&devices_kset->list_lock); | |
1524 | list_move(&deva->kobj.entry, &devb->kobj.entry); | |
1525 | spin_unlock(&devices_kset->list_lock); | |
1526 | } | |
1527 | ||
1528 | /** | |
1529 | * devices_kset_move_last - move the device to the end of devices_kset's list. | |
1530 | * @dev: device to move | |
1531 | */ | |
1532 | void devices_kset_move_last(struct device *dev) | |
1533 | { | |
1534 | if (!devices_kset) | |
1535 | return; | |
1536 | pr_debug("devices_kset: Moving %s to end of list\n", dev_name(dev)); | |
1537 | spin_lock(&devices_kset->list_lock); | |
1538 | list_move_tail(&dev->kobj.entry, &devices_kset->list); | |
1539 | spin_unlock(&devices_kset->list_lock); | |
1540 | } | |
1541 | ||
1da177e4 | 1542 | /** |
4a3ad20c GKH |
1543 | * device_create_file - create sysfs attribute file for device. |
1544 | * @dev: device. | |
1545 | * @attr: device attribute descriptor. | |
1da177e4 | 1546 | */ |
26579ab7 PC |
1547 | int device_create_file(struct device *dev, |
1548 | const struct device_attribute *attr) | |
1da177e4 LT |
1549 | { |
1550 | int error = 0; | |
8f46baaa FB |
1551 | |
1552 | if (dev) { | |
1553 | WARN(((attr->attr.mode & S_IWUGO) && !attr->store), | |
97521978 | 1554 | "Attribute %s: write permission without 'store'\n", |
1555 | attr->attr.name); | |
8f46baaa | 1556 | WARN(((attr->attr.mode & S_IRUGO) && !attr->show), |
97521978 | 1557 | "Attribute %s: read permission without 'show'\n", |
1558 | attr->attr.name); | |
1da177e4 | 1559 | error = sysfs_create_file(&dev->kobj, &attr->attr); |
8f46baaa FB |
1560 | } |
1561 | ||
1da177e4 LT |
1562 | return error; |
1563 | } | |
86df2687 | 1564 | EXPORT_SYMBOL_GPL(device_create_file); |
1da177e4 LT |
1565 | |
1566 | /** | |
4a3ad20c GKH |
1567 | * device_remove_file - remove sysfs attribute file. |
1568 | * @dev: device. | |
1569 | * @attr: device attribute descriptor. | |
1da177e4 | 1570 | */ |
26579ab7 PC |
1571 | void device_remove_file(struct device *dev, |
1572 | const struct device_attribute *attr) | |
1da177e4 | 1573 | { |
0c98b19f | 1574 | if (dev) |
1da177e4 | 1575 | sysfs_remove_file(&dev->kobj, &attr->attr); |
1da177e4 | 1576 | } |
86df2687 | 1577 | EXPORT_SYMBOL_GPL(device_remove_file); |
1da177e4 | 1578 | |
6b0afc2a TH |
1579 | /** |
1580 | * device_remove_file_self - remove sysfs attribute file from its own method. | |
1581 | * @dev: device. | |
1582 | * @attr: device attribute descriptor. | |
1583 | * | |
1584 | * See kernfs_remove_self() for details. | |
1585 | */ | |
1586 | bool device_remove_file_self(struct device *dev, | |
1587 | const struct device_attribute *attr) | |
1588 | { | |
1589 | if (dev) | |
1590 | return sysfs_remove_file_self(&dev->kobj, &attr->attr); | |
1591 | else | |
1592 | return false; | |
1593 | } | |
1594 | EXPORT_SYMBOL_GPL(device_remove_file_self); | |
1595 | ||
2589f188 GKH |
1596 | /** |
1597 | * device_create_bin_file - create sysfs binary attribute file for device. | |
1598 | * @dev: device. | |
1599 | * @attr: device binary attribute descriptor. | |
1600 | */ | |
66ecb92b PC |
1601 | int device_create_bin_file(struct device *dev, |
1602 | const struct bin_attribute *attr) | |
2589f188 GKH |
1603 | { |
1604 | int error = -EINVAL; | |
1605 | if (dev) | |
1606 | error = sysfs_create_bin_file(&dev->kobj, attr); | |
1607 | return error; | |
1608 | } | |
1609 | EXPORT_SYMBOL_GPL(device_create_bin_file); | |
1610 | ||
1611 | /** | |
1612 | * device_remove_bin_file - remove sysfs binary attribute file | |
1613 | * @dev: device. | |
1614 | * @attr: device binary attribute descriptor. | |
1615 | */ | |
66ecb92b PC |
1616 | void device_remove_bin_file(struct device *dev, |
1617 | const struct bin_attribute *attr) | |
2589f188 GKH |
1618 | { |
1619 | if (dev) | |
1620 | sysfs_remove_bin_file(&dev->kobj, attr); | |
1621 | } | |
1622 | EXPORT_SYMBOL_GPL(device_remove_bin_file); | |
1623 | ||
34bb61f9 JB |
1624 | static void klist_children_get(struct klist_node *n) |
1625 | { | |
f791b8c8 GKH |
1626 | struct device_private *p = to_device_private_parent(n); |
1627 | struct device *dev = p->device; | |
34bb61f9 JB |
1628 | |
1629 | get_device(dev); | |
1630 | } | |
1631 | ||
1632 | static void klist_children_put(struct klist_node *n) | |
1633 | { | |
f791b8c8 GKH |
1634 | struct device_private *p = to_device_private_parent(n); |
1635 | struct device *dev = p->device; | |
34bb61f9 JB |
1636 | |
1637 | put_device(dev); | |
1638 | } | |
1639 | ||
1da177e4 | 1640 | /** |
4a3ad20c GKH |
1641 | * device_initialize - init device structure. |
1642 | * @dev: device. | |
1da177e4 | 1643 | * |
5739411a CH |
1644 | * This prepares the device for use by other layers by initializing |
1645 | * its fields. | |
4a3ad20c | 1646 | * It is the first half of device_register(), if called by |
5739411a CH |
1647 | * that function, though it can also be called separately, so one |
1648 | * may use @dev's fields. In particular, get_device()/put_device() | |
1649 | * may be used for reference counting of @dev after calling this | |
1650 | * function. | |
1651 | * | |
b10d5efd AS |
1652 | * All fields in @dev must be initialized by the caller to 0, except |
1653 | * for those explicitly set to some other value. The simplest | |
1654 | * approach is to use kzalloc() to allocate the structure containing | |
1655 | * @dev. | |
1656 | * | |
5739411a CH |
1657 | * NOTE: Use put_device() to give up your reference instead of freeing |
1658 | * @dev directly once you have called this function. | |
1da177e4 | 1659 | */ |
1da177e4 LT |
1660 | void device_initialize(struct device *dev) |
1661 | { | |
881c6cfd | 1662 | dev->kobj.kset = devices_kset; |
f9cb074b | 1663 | kobject_init(&dev->kobj, &device_ktype); |
1da177e4 | 1664 | INIT_LIST_HEAD(&dev->dma_pools); |
3142788b | 1665 | mutex_init(&dev->mutex); |
1704f47b | 1666 | lockdep_set_novalidate_class(&dev->mutex); |
9ac7849e TH |
1667 | spin_lock_init(&dev->devres_lock); |
1668 | INIT_LIST_HEAD(&dev->devres_head); | |
3b98aeaf | 1669 | device_pm_init(dev); |
87348136 | 1670 | set_dev_node(dev, -1); |
4a7cc831 JL |
1671 | #ifdef CONFIG_GENERIC_MSI_IRQ |
1672 | INIT_LIST_HEAD(&dev->msi_list); | |
1673 | #endif | |
9ed98953 RW |
1674 | INIT_LIST_HEAD(&dev->links.consumers); |
1675 | INIT_LIST_HEAD(&dev->links.suppliers); | |
1676 | dev->links.status = DL_DEV_NO_DRIVER; | |
1da177e4 | 1677 | } |
86df2687 | 1678 | EXPORT_SYMBOL_GPL(device_initialize); |
1da177e4 | 1679 | |
d73ce004 | 1680 | struct kobject *virtual_device_parent(struct device *dev) |
f0ee61a6 | 1681 | { |
86406245 | 1682 | static struct kobject *virtual_dir = NULL; |
f0ee61a6 | 1683 | |
86406245 | 1684 | if (!virtual_dir) |
4ff6abff | 1685 | virtual_dir = kobject_create_and_add("virtual", |
881c6cfd | 1686 | &devices_kset->kobj); |
f0ee61a6 | 1687 | |
86406245 | 1688 | return virtual_dir; |
f0ee61a6 GKH |
1689 | } |
1690 | ||
bc451f20 EB |
1691 | struct class_dir { |
1692 | struct kobject kobj; | |
1693 | struct class *class; | |
1694 | }; | |
1695 | ||
1696 | #define to_class_dir(obj) container_of(obj, struct class_dir, kobj) | |
1697 | ||
1698 | static void class_dir_release(struct kobject *kobj) | |
1699 | { | |
1700 | struct class_dir *dir = to_class_dir(kobj); | |
1701 | kfree(dir); | |
1702 | } | |
1703 | ||
1704 | static const | |
1705 | struct kobj_ns_type_operations *class_dir_child_ns_type(struct kobject *kobj) | |
40fa5422 | 1706 | { |
bc451f20 EB |
1707 | struct class_dir *dir = to_class_dir(kobj); |
1708 | return dir->class->ns_type; | |
1709 | } | |
1710 | ||
1711 | static struct kobj_type class_dir_ktype = { | |
1712 | .release = class_dir_release, | |
1713 | .sysfs_ops = &kobj_sysfs_ops, | |
1714 | .child_ns_type = class_dir_child_ns_type | |
1715 | }; | |
1716 | ||
1717 | static struct kobject * | |
1718 | class_dir_create_and_add(struct class *class, struct kobject *parent_kobj) | |
1719 | { | |
1720 | struct class_dir *dir; | |
43968d2f GKH |
1721 | int retval; |
1722 | ||
bc451f20 EB |
1723 | dir = kzalloc(sizeof(*dir), GFP_KERNEL); |
1724 | if (!dir) | |
84d0c27d | 1725 | return ERR_PTR(-ENOMEM); |
bc451f20 EB |
1726 | |
1727 | dir->class = class; | |
1728 | kobject_init(&dir->kobj, &class_dir_ktype); | |
1729 | ||
6b6e39a6 | 1730 | dir->kobj.kset = &class->p->glue_dirs; |
bc451f20 EB |
1731 | |
1732 | retval = kobject_add(&dir->kobj, parent_kobj, "%s", class->name); | |
1733 | if (retval < 0) { | |
1734 | kobject_put(&dir->kobj); | |
84d0c27d | 1735 | return ERR_PTR(retval); |
bc451f20 EB |
1736 | } |
1737 | return &dir->kobj; | |
1738 | } | |
1739 | ||
e4a60d13 | 1740 | static DEFINE_MUTEX(gdp_mutex); |
bc451f20 EB |
1741 | |
1742 | static struct kobject *get_device_parent(struct device *dev, | |
1743 | struct device *parent) | |
1744 | { | |
86406245 KS |
1745 | if (dev->class) { |
1746 | struct kobject *kobj = NULL; | |
1747 | struct kobject *parent_kobj; | |
1748 | struct kobject *k; | |
1749 | ||
ead454fe | 1750 | #ifdef CONFIG_BLOCK |
39aba963 | 1751 | /* block disks show up in /sys/block */ |
e52eec13 | 1752 | if (sysfs_deprecated && dev->class == &block_class) { |
39aba963 KS |
1753 | if (parent && parent->class == &block_class) |
1754 | return &parent->kobj; | |
6b6e39a6 | 1755 | return &block_class.p->subsys.kobj; |
39aba963 | 1756 | } |
ead454fe | 1757 | #endif |
e52eec13 | 1758 | |
86406245 KS |
1759 | /* |
1760 | * If we have no parent, we live in "virtual". | |
0f4dafc0 KS |
1761 | * Class-devices with a non class-device as parent, live |
1762 | * in a "glue" directory to prevent namespace collisions. | |
86406245 KS |
1763 | */ |
1764 | if (parent == NULL) | |
1765 | parent_kobj = virtual_device_parent(dev); | |
24b1442d | 1766 | else if (parent->class && !dev->class->ns_type) |
86406245 KS |
1767 | return &parent->kobj; |
1768 | else | |
1769 | parent_kobj = &parent->kobj; | |
1770 | ||
77d3d7c1 TH |
1771 | mutex_lock(&gdp_mutex); |
1772 | ||
86406245 | 1773 | /* find our class-directory at the parent and reference it */ |
6b6e39a6 KS |
1774 | spin_lock(&dev->class->p->glue_dirs.list_lock); |
1775 | list_for_each_entry(k, &dev->class->p->glue_dirs.list, entry) | |
86406245 KS |
1776 | if (k->parent == parent_kobj) { |
1777 | kobj = kobject_get(k); | |
1778 | break; | |
1779 | } | |
6b6e39a6 | 1780 | spin_unlock(&dev->class->p->glue_dirs.list_lock); |
77d3d7c1 TH |
1781 | if (kobj) { |
1782 | mutex_unlock(&gdp_mutex); | |
86406245 | 1783 | return kobj; |
77d3d7c1 | 1784 | } |
86406245 KS |
1785 | |
1786 | /* or create a new class-directory at the parent device */ | |
bc451f20 | 1787 | k = class_dir_create_and_add(dev->class, parent_kobj); |
0f4dafc0 | 1788 | /* do not emit an uevent for this simple "glue" directory */ |
77d3d7c1 | 1789 | mutex_unlock(&gdp_mutex); |
43968d2f | 1790 | return k; |
86406245 KS |
1791 | } |
1792 | ||
ca22e56d KS |
1793 | /* subsystems can specify a default root directory for their devices */ |
1794 | if (!parent && dev->bus && dev->bus->dev_root) | |
1795 | return &dev->bus->dev_root->kobj; | |
1796 | ||
86406245 | 1797 | if (parent) |
c744aeae CH |
1798 | return &parent->kobj; |
1799 | return NULL; | |
1800 | } | |
da231fd5 | 1801 | |
cebf8fd1 ML |
1802 | static inline bool live_in_glue_dir(struct kobject *kobj, |
1803 | struct device *dev) | |
1804 | { | |
1805 | if (!kobj || !dev->class || | |
1806 | kobj->kset != &dev->class->p->glue_dirs) | |
1807 | return false; | |
1808 | return true; | |
1809 | } | |
1810 | ||
1811 | static inline struct kobject *get_glue_dir(struct device *dev) | |
1812 | { | |
1813 | return dev->kobj.parent; | |
1814 | } | |
1815 | ||
1816 | /* | |
1817 | * make sure cleaning up dir as the last step, we need to make | |
1818 | * sure .release handler of kobject is run with holding the | |
1819 | * global lock | |
1820 | */ | |
63b6971a | 1821 | static void cleanup_glue_dir(struct device *dev, struct kobject *glue_dir) |
da231fd5 | 1822 | { |
0f4dafc0 | 1823 | /* see if we live in a "glue" directory */ |
cebf8fd1 | 1824 | if (!live_in_glue_dir(glue_dir, dev)) |
da231fd5 KS |
1825 | return; |
1826 | ||
e4a60d13 | 1827 | mutex_lock(&gdp_mutex); |
726e4109 BH |
1828 | if (!kobject_has_children(glue_dir)) |
1829 | kobject_del(glue_dir); | |
0f4dafc0 | 1830 | kobject_put(glue_dir); |
e4a60d13 | 1831 | mutex_unlock(&gdp_mutex); |
da231fd5 | 1832 | } |
63b6971a | 1833 | |
2ee97caf CH |
1834 | static int device_add_class_symlinks(struct device *dev) |
1835 | { | |
5590f319 | 1836 | struct device_node *of_node = dev_of_node(dev); |
2ee97caf CH |
1837 | int error; |
1838 | ||
5590f319 | 1839 | if (of_node) { |
0c3c234b | 1840 | error = sysfs_create_link(&dev->kobj, of_node_kobj(of_node), "of_node"); |
5590f319 BH |
1841 | if (error) |
1842 | dev_warn(dev, "Error %d creating of_node link\n",error); | |
1843 | /* An error here doesn't warrant bringing down the device */ | |
1844 | } | |
1845 | ||
2ee97caf CH |
1846 | if (!dev->class) |
1847 | return 0; | |
da231fd5 | 1848 | |
1fbfee6c | 1849 | error = sysfs_create_link(&dev->kobj, |
6b6e39a6 | 1850 | &dev->class->p->subsys.kobj, |
2ee97caf CH |
1851 | "subsystem"); |
1852 | if (error) | |
5590f319 | 1853 | goto out_devnode; |
da231fd5 | 1854 | |
4e886c29 | 1855 | if (dev->parent && device_is_not_partition(dev)) { |
39aba963 | 1856 | error = sysfs_create_link(&dev->kobj, &dev->parent->kobj, |
4f01a757 DT |
1857 | "device"); |
1858 | if (error) | |
39aba963 | 1859 | goto out_subsys; |
2ee97caf | 1860 | } |
2ee97caf | 1861 | |
ead454fe | 1862 | #ifdef CONFIG_BLOCK |
39aba963 | 1863 | /* /sys/block has directories and does not need symlinks */ |
e52eec13 | 1864 | if (sysfs_deprecated && dev->class == &block_class) |
39aba963 | 1865 | return 0; |
ead454fe | 1866 | #endif |
39aba963 | 1867 | |
da231fd5 | 1868 | /* link in the class directory pointing to the device */ |
6b6e39a6 | 1869 | error = sysfs_create_link(&dev->class->p->subsys.kobj, |
1e0b2cf9 | 1870 | &dev->kobj, dev_name(dev)); |
da231fd5 | 1871 | if (error) |
39aba963 | 1872 | goto out_device; |
da231fd5 | 1873 | |
da231fd5 KS |
1874 | return 0; |
1875 | ||
39aba963 KS |
1876 | out_device: |
1877 | sysfs_remove_link(&dev->kobj, "device"); | |
da231fd5 | 1878 | |
2ee97caf CH |
1879 | out_subsys: |
1880 | sysfs_remove_link(&dev->kobj, "subsystem"); | |
5590f319 BH |
1881 | out_devnode: |
1882 | sysfs_remove_link(&dev->kobj, "of_node"); | |
2ee97caf CH |
1883 | return error; |
1884 | } | |
1885 | ||
1886 | static void device_remove_class_symlinks(struct device *dev) | |
1887 | { | |
5590f319 BH |
1888 | if (dev_of_node(dev)) |
1889 | sysfs_remove_link(&dev->kobj, "of_node"); | |
1890 | ||
2ee97caf CH |
1891 | if (!dev->class) |
1892 | return; | |
da231fd5 | 1893 | |
4e886c29 | 1894 | if (dev->parent && device_is_not_partition(dev)) |
da231fd5 | 1895 | sysfs_remove_link(&dev->kobj, "device"); |
2ee97caf | 1896 | sysfs_remove_link(&dev->kobj, "subsystem"); |
ead454fe | 1897 | #ifdef CONFIG_BLOCK |
e52eec13 | 1898 | if (sysfs_deprecated && dev->class == &block_class) |
39aba963 | 1899 | return; |
ead454fe | 1900 | #endif |
6b6e39a6 | 1901 | sysfs_delete_link(&dev->class->p->subsys.kobj, &dev->kobj, dev_name(dev)); |
2ee97caf CH |
1902 | } |
1903 | ||
413c239f SR |
1904 | /** |
1905 | * dev_set_name - set a device name | |
1906 | * @dev: device | |
46232366 | 1907 | * @fmt: format string for the device's name |
413c239f SR |
1908 | */ |
1909 | int dev_set_name(struct device *dev, const char *fmt, ...) | |
1910 | { | |
1911 | va_list vargs; | |
1fa5ae85 | 1912 | int err; |
413c239f SR |
1913 | |
1914 | va_start(vargs, fmt); | |
1fa5ae85 | 1915 | err = kobject_set_name_vargs(&dev->kobj, fmt, vargs); |
413c239f | 1916 | va_end(vargs); |
1fa5ae85 | 1917 | return err; |
413c239f SR |
1918 | } |
1919 | EXPORT_SYMBOL_GPL(dev_set_name); | |
1920 | ||
e105b8bf DW |
1921 | /** |
1922 | * device_to_dev_kobj - select a /sys/dev/ directory for the device | |
1923 | * @dev: device | |
1924 | * | |
1925 | * By default we select char/ for new entries. Setting class->dev_obj | |
1926 | * to NULL prevents an entry from being created. class->dev_kobj must | |
1927 | * be set (or cleared) before any devices are registered to the class | |
1928 | * otherwise device_create_sys_dev_entry() and | |
0d4e293c PK |
1929 | * device_remove_sys_dev_entry() will disagree about the presence of |
1930 | * the link. | |
e105b8bf DW |
1931 | */ |
1932 | static struct kobject *device_to_dev_kobj(struct device *dev) | |
1933 | { | |
1934 | struct kobject *kobj; | |
1935 | ||
1936 | if (dev->class) | |
1937 | kobj = dev->class->dev_kobj; | |
1938 | else | |
1939 | kobj = sysfs_dev_char_kobj; | |
1940 | ||
1941 | return kobj; | |
1942 | } | |
1943 | ||
1944 | static int device_create_sys_dev_entry(struct device *dev) | |
1945 | { | |
1946 | struct kobject *kobj = device_to_dev_kobj(dev); | |
1947 | int error = 0; | |
1948 | char devt_str[15]; | |
1949 | ||
1950 | if (kobj) { | |
1951 | format_dev_t(devt_str, dev->devt); | |
1952 | error = sysfs_create_link(kobj, &dev->kobj, devt_str); | |
1953 | } | |
1954 | ||
1955 | return error; | |
1956 | } | |
1957 | ||
1958 | static void device_remove_sys_dev_entry(struct device *dev) | |
1959 | { | |
1960 | struct kobject *kobj = device_to_dev_kobj(dev); | |
1961 | char devt_str[15]; | |
1962 | ||
1963 | if (kobj) { | |
1964 | format_dev_t(devt_str, dev->devt); | |
1965 | sysfs_remove_link(kobj, devt_str); | |
1966 | } | |
1967 | } | |
1968 | ||
46d3a037 | 1969 | static int device_private_init(struct device *dev) |
b4028437 GKH |
1970 | { |
1971 | dev->p = kzalloc(sizeof(*dev->p), GFP_KERNEL); | |
1972 | if (!dev->p) | |
1973 | return -ENOMEM; | |
1974 | dev->p->device = dev; | |
1975 | klist_init(&dev->p->klist_children, klist_children_get, | |
1976 | klist_children_put); | |
ef8a3fd6 | 1977 | INIT_LIST_HEAD(&dev->p->deferred_probe); |
b4028437 GKH |
1978 | return 0; |
1979 | } | |
1980 | ||
1da177e4 | 1981 | /** |
4a3ad20c GKH |
1982 | * device_add - add device to device hierarchy. |
1983 | * @dev: device. | |
1da177e4 | 1984 | * |
4a3ad20c GKH |
1985 | * This is part 2 of device_register(), though may be called |
1986 | * separately _iff_ device_initialize() has been called separately. | |
1da177e4 | 1987 | * |
5739411a | 1988 | * This adds @dev to the kobject hierarchy via kobject_add(), adds it |
4a3ad20c GKH |
1989 | * to the global and sibling lists for the device, then |
1990 | * adds it to the other relevant subsystems of the driver model. | |
5739411a | 1991 | * |
b10d5efd AS |
1992 | * Do not call this routine or device_register() more than once for |
1993 | * any device structure. The driver model core is not designed to work | |
1994 | * with devices that get unregistered and then spring back to life. | |
1995 | * (Among other things, it's very hard to guarantee that all references | |
1996 | * to the previous incarnation of @dev have been dropped.) Allocate | |
1997 | * and register a fresh new struct device instead. | |
1998 | * | |
5739411a CH |
1999 | * NOTE: _Never_ directly free @dev after calling this function, even |
2000 | * if it returned an error! Always use put_device() to give up your | |
2001 | * reference instead. | |
1da177e4 LT |
2002 | */ |
2003 | int device_add(struct device *dev) | |
2004 | { | |
35dbf4ef | 2005 | struct device *parent; |
ca22e56d | 2006 | struct kobject *kobj; |
c47ed219 | 2007 | struct class_interface *class_intf; |
c906a48a | 2008 | int error = -EINVAL; |
cebf8fd1 | 2009 | struct kobject *glue_dir = NULL; |
775b64d2 | 2010 | |
1da177e4 | 2011 | dev = get_device(dev); |
c906a48a GKH |
2012 | if (!dev) |
2013 | goto done; | |
2014 | ||
fb069a5d | 2015 | if (!dev->p) { |
b4028437 GKH |
2016 | error = device_private_init(dev); |
2017 | if (error) | |
2018 | goto done; | |
fb069a5d | 2019 | } |
fb069a5d | 2020 | |
1fa5ae85 KS |
2021 | /* |
2022 | * for statically allocated devices, which should all be converted | |
2023 | * some day, we need to initialize the name. We prevent reading back | |
2024 | * the name, and force the use of dev_name() | |
2025 | */ | |
2026 | if (dev->init_name) { | |
acc0e90f | 2027 | dev_set_name(dev, "%s", dev->init_name); |
1fa5ae85 KS |
2028 | dev->init_name = NULL; |
2029 | } | |
c906a48a | 2030 | |
ca22e56d KS |
2031 | /* subsystems can specify simple device enumeration */ |
2032 | if (!dev_name(dev) && dev->bus && dev->bus->dev_name) | |
2033 | dev_set_name(dev, "%s%u", dev->bus->dev_name, dev->id); | |
2034 | ||
e6309e75 TG |
2035 | if (!dev_name(dev)) { |
2036 | error = -EINVAL; | |
5c8563d7 | 2037 | goto name_error; |
e6309e75 | 2038 | } |
1da177e4 | 2039 | |
1e0b2cf9 | 2040 | pr_debug("device: '%s': %s\n", dev_name(dev), __func__); |
c205ef48 | 2041 | |
1da177e4 | 2042 | parent = get_device(dev->parent); |
ca22e56d | 2043 | kobj = get_device_parent(dev, parent); |
84d0c27d TH |
2044 | if (IS_ERR(kobj)) { |
2045 | error = PTR_ERR(kobj); | |
2046 | goto parent_error; | |
2047 | } | |
ca22e56d KS |
2048 | if (kobj) |
2049 | dev->kobj.parent = kobj; | |
1da177e4 | 2050 | |
0d358f22 | 2051 | /* use parent numa_node */ |
56f2de81 | 2052 | if (parent && (dev_to_node(dev) == NUMA_NO_NODE)) |
0d358f22 YL |
2053 | set_dev_node(dev, dev_to_node(parent)); |
2054 | ||
1da177e4 | 2055 | /* first, register with generic layer. */ |
8a577ffc KS |
2056 | /* we require the name to be set before, and pass NULL */ |
2057 | error = kobject_add(&dev->kobj, dev->kobj.parent, NULL); | |
cebf8fd1 ML |
2058 | if (error) { |
2059 | glue_dir = get_glue_dir(dev); | |
1da177e4 | 2060 | goto Error; |
cebf8fd1 | 2061 | } |
a7fd6706 | 2062 | |
37022644 | 2063 | /* notify platform of device entry */ |
07de0e86 HK |
2064 | error = device_platform_notify(dev, KOBJ_ADD); |
2065 | if (error) | |
2066 | goto platform_error; | |
37022644 | 2067 | |
c5e064a6 | 2068 | error = device_create_file(dev, &dev_attr_uevent); |
a306eea4 CH |
2069 | if (error) |
2070 | goto attrError; | |
a7fd6706 | 2071 | |
2ee97caf CH |
2072 | error = device_add_class_symlinks(dev); |
2073 | if (error) | |
2074 | goto SymlinkError; | |
dc0afa83 CH |
2075 | error = device_add_attrs(dev); |
2076 | if (error) | |
2620efef | 2077 | goto AttrsError; |
dc0afa83 CH |
2078 | error = bus_add_device(dev); |
2079 | if (error) | |
1da177e4 | 2080 | goto BusError; |
3b98aeaf | 2081 | error = dpm_sysfs_add(dev); |
57eee3d2 | 2082 | if (error) |
3b98aeaf AS |
2083 | goto DPMError; |
2084 | device_pm_add(dev); | |
ec0676ee | 2085 | |
0cd75047 SK |
2086 | if (MAJOR(dev->devt)) { |
2087 | error = device_create_file(dev, &dev_attr_dev); | |
2088 | if (error) | |
2089 | goto DevAttrError; | |
2090 | ||
2091 | error = device_create_sys_dev_entry(dev); | |
2092 | if (error) | |
2093 | goto SysEntryError; | |
2094 | ||
2095 | devtmpfs_create_node(dev); | |
2096 | } | |
2097 | ||
ec0676ee | 2098 | /* Notify clients of device addition. This call must come |
268863f4 | 2099 | * after dpm_sysfs_add() and before kobject_uevent(). |
ec0676ee AS |
2100 | */ |
2101 | if (dev->bus) | |
2102 | blocking_notifier_call_chain(&dev->bus->p->bus_notifier, | |
2103 | BUS_NOTIFY_ADD_DEVICE, dev); | |
2104 | ||
83b5fb4c | 2105 | kobject_uevent(&dev->kobj, KOBJ_ADD); |
2023c610 | 2106 | bus_probe_device(dev); |
1da177e4 | 2107 | if (parent) |
f791b8c8 GKH |
2108 | klist_add_tail(&dev->p->knode_parent, |
2109 | &parent->p->klist_children); | |
1da177e4 | 2110 | |
5d9fd169 | 2111 | if (dev->class) { |
ca22e56d | 2112 | mutex_lock(&dev->class->p->mutex); |
c47ed219 | 2113 | /* tie the class to the device */ |
570d0200 | 2114 | klist_add_tail(&dev->p->knode_class, |
6b6e39a6 | 2115 | &dev->class->p->klist_devices); |
c47ed219 GKH |
2116 | |
2117 | /* notify any interfaces that the device is here */ | |
184f1f77 | 2118 | list_for_each_entry(class_intf, |
ca22e56d | 2119 | &dev->class->p->interfaces, node) |
c47ed219 GKH |
2120 | if (class_intf->add_dev) |
2121 | class_intf->add_dev(dev, class_intf); | |
ca22e56d | 2122 | mutex_unlock(&dev->class->p->mutex); |
5d9fd169 | 2123 | } |
c906a48a | 2124 | done: |
1da177e4 LT |
2125 | put_device(dev); |
2126 | return error; | |
0cd75047 SK |
2127 | SysEntryError: |
2128 | if (MAJOR(dev->devt)) | |
2129 | device_remove_file(dev, &dev_attr_dev); | |
2130 | DevAttrError: | |
2131 | device_pm_remove(dev); | |
2132 | dpm_sysfs_remove(dev); | |
3b98aeaf | 2133 | DPMError: |
57eee3d2 RW |
2134 | bus_remove_device(dev); |
2135 | BusError: | |
82f0cf9b | 2136 | device_remove_attrs(dev); |
2620efef | 2137 | AttrsError: |
2ee97caf CH |
2138 | device_remove_class_symlinks(dev); |
2139 | SymlinkError: | |
c5e064a6 | 2140 | device_remove_file(dev, &dev_attr_uevent); |
23681e47 | 2141 | attrError: |
07de0e86 HK |
2142 | device_platform_notify(dev, KOBJ_REMOVE); |
2143 | platform_error: | |
312c004d | 2144 | kobject_uevent(&dev->kobj, KOBJ_REMOVE); |
cebf8fd1 | 2145 | glue_dir = get_glue_dir(dev); |
1da177e4 LT |
2146 | kobject_del(&dev->kobj); |
2147 | Error: | |
cebf8fd1 | 2148 | cleanup_glue_dir(dev, glue_dir); |
84d0c27d | 2149 | parent_error: |
5f0163a5 | 2150 | put_device(parent); |
5c8563d7 KS |
2151 | name_error: |
2152 | kfree(dev->p); | |
2153 | dev->p = NULL; | |
c906a48a | 2154 | goto done; |
1da177e4 | 2155 | } |
86df2687 | 2156 | EXPORT_SYMBOL_GPL(device_add); |
1da177e4 | 2157 | |
1da177e4 | 2158 | /** |
4a3ad20c GKH |
2159 | * device_register - register a device with the system. |
2160 | * @dev: pointer to the device structure | |
1da177e4 | 2161 | * |
4a3ad20c GKH |
2162 | * This happens in two clean steps - initialize the device |
2163 | * and add it to the system. The two steps can be called | |
2164 | * separately, but this is the easiest and most common. | |
2165 | * I.e. you should only call the two helpers separately if | |
2166 | * have a clearly defined need to use and refcount the device | |
2167 | * before it is added to the hierarchy. | |
5739411a | 2168 | * |
b10d5efd AS |
2169 | * For more information, see the kerneldoc for device_initialize() |
2170 | * and device_add(). | |
2171 | * | |
5739411a CH |
2172 | * NOTE: _Never_ directly free @dev after calling this function, even |
2173 | * if it returned an error! Always use put_device() to give up the | |
2174 | * reference initialized in this function instead. | |
1da177e4 | 2175 | */ |
1da177e4 LT |
2176 | int device_register(struct device *dev) |
2177 | { | |
2178 | device_initialize(dev); | |
2179 | return device_add(dev); | |
2180 | } | |
86df2687 | 2181 | EXPORT_SYMBOL_GPL(device_register); |
1da177e4 | 2182 | |
1da177e4 | 2183 | /** |
4a3ad20c GKH |
2184 | * get_device - increment reference count for device. |
2185 | * @dev: device. | |
1da177e4 | 2186 | * |
4a3ad20c GKH |
2187 | * This simply forwards the call to kobject_get(), though |
2188 | * we do take care to provide for the case that we get a NULL | |
2189 | * pointer passed in. | |
1da177e4 | 2190 | */ |
4a3ad20c | 2191 | struct device *get_device(struct device *dev) |
1da177e4 | 2192 | { |
b0d1f807 | 2193 | return dev ? kobj_to_dev(kobject_get(&dev->kobj)) : NULL; |
1da177e4 | 2194 | } |
86df2687 | 2195 | EXPORT_SYMBOL_GPL(get_device); |
1da177e4 | 2196 | |
1da177e4 | 2197 | /** |
4a3ad20c GKH |
2198 | * put_device - decrement reference count. |
2199 | * @dev: device in question. | |
1da177e4 | 2200 | */ |
4a3ad20c | 2201 | void put_device(struct device *dev) |
1da177e4 | 2202 | { |
edfaa7c3 | 2203 | /* might_sleep(); */ |
1da177e4 LT |
2204 | if (dev) |
2205 | kobject_put(&dev->kobj); | |
2206 | } | |
86df2687 | 2207 | EXPORT_SYMBOL_GPL(put_device); |
1da177e4 | 2208 | |
1da177e4 | 2209 | /** |
4a3ad20c GKH |
2210 | * device_del - delete device from system. |
2211 | * @dev: device. | |
1da177e4 | 2212 | * |
4a3ad20c GKH |
2213 | * This is the first part of the device unregistration |
2214 | * sequence. This removes the device from the lists we control | |
2215 | * from here, has it removed from the other driver model | |
2216 | * subsystems it was added to in device_add(), and removes it | |
2217 | * from the kobject hierarchy. | |
1da177e4 | 2218 | * |
4a3ad20c GKH |
2219 | * NOTE: this should be called manually _iff_ device_add() was |
2220 | * also called manually. | |
1da177e4 | 2221 | */ |
4a3ad20c | 2222 | void device_del(struct device *dev) |
1da177e4 | 2223 | { |
4a3ad20c | 2224 | struct device *parent = dev->parent; |
cebf8fd1 | 2225 | struct kobject *glue_dir = NULL; |
c47ed219 | 2226 | struct class_interface *class_intf; |
1da177e4 | 2227 | |
3451a495 AD |
2228 | /* |
2229 | * Hold the device lock and set the "dead" flag to guarantee that | |
2230 | * the update behavior is consistent with the other bitfields near | |
2231 | * it and that we cannot have an asynchronous probe routine trying | |
2232 | * to run while we are tearing out the bus/class/sysfs from | |
2233 | * underneath the device. | |
2234 | */ | |
2235 | device_lock(dev); | |
2236 | dev->p->dead = true; | |
2237 | device_unlock(dev); | |
2238 | ||
ec0676ee AS |
2239 | /* Notify clients of device removal. This call must come |
2240 | * before dpm_sysfs_remove(). | |
2241 | */ | |
2242 | if (dev->bus) | |
2243 | blocking_notifier_call_chain(&dev->bus->p->bus_notifier, | |
2244 | BUS_NOTIFY_DEL_DEVICE, dev); | |
9ed98953 | 2245 | |
3b98aeaf | 2246 | dpm_sysfs_remove(dev); |
1da177e4 | 2247 | if (parent) |
f791b8c8 | 2248 | klist_del(&dev->p->knode_parent); |
e105b8bf | 2249 | if (MAJOR(dev->devt)) { |
2b2af54a | 2250 | devtmpfs_delete_node(dev); |
e105b8bf | 2251 | device_remove_sys_dev_entry(dev); |
c5e064a6 | 2252 | device_remove_file(dev, &dev_attr_dev); |
e105b8bf | 2253 | } |
b9d9c82b | 2254 | if (dev->class) { |
da231fd5 | 2255 | device_remove_class_symlinks(dev); |
99ef3ef8 | 2256 | |
ca22e56d | 2257 | mutex_lock(&dev->class->p->mutex); |
c47ed219 | 2258 | /* notify any interfaces that the device is now gone */ |
184f1f77 | 2259 | list_for_each_entry(class_intf, |
ca22e56d | 2260 | &dev->class->p->interfaces, node) |
c47ed219 GKH |
2261 | if (class_intf->remove_dev) |
2262 | class_intf->remove_dev(dev, class_intf); | |
2263 | /* remove the device from the class list */ | |
570d0200 | 2264 | klist_del(&dev->p->knode_class); |
ca22e56d | 2265 | mutex_unlock(&dev->class->p->mutex); |
b9d9c82b | 2266 | } |
c5e064a6 | 2267 | device_remove_file(dev, &dev_attr_uevent); |
2620efef | 2268 | device_remove_attrs(dev); |
28953533 | 2269 | bus_remove_device(dev); |
4b6d1f12 | 2270 | device_pm_remove(dev); |
d1c3414c | 2271 | driver_deferred_probe_del(dev); |
07de0e86 | 2272 | device_platform_notify(dev, KOBJ_REMOVE); |
478573c9 | 2273 | device_remove_properties(dev); |
2ec16150 | 2274 | device_links_purge(dev); |
1da177e4 | 2275 | |
599bad38 JR |
2276 | if (dev->bus) |
2277 | blocking_notifier_call_chain(&dev->bus->p->bus_notifier, | |
2278 | BUS_NOTIFY_REMOVED_DEVICE, dev); | |
312c004d | 2279 | kobject_uevent(&dev->kobj, KOBJ_REMOVE); |
cebf8fd1 | 2280 | glue_dir = get_glue_dir(dev); |
1da177e4 | 2281 | kobject_del(&dev->kobj); |
cebf8fd1 | 2282 | cleanup_glue_dir(dev, glue_dir); |
da231fd5 | 2283 | put_device(parent); |
1da177e4 | 2284 | } |
86df2687 | 2285 | EXPORT_SYMBOL_GPL(device_del); |
1da177e4 LT |
2286 | |
2287 | /** | |
4a3ad20c GKH |
2288 | * device_unregister - unregister device from system. |
2289 | * @dev: device going away. | |
1da177e4 | 2290 | * |
4a3ad20c GKH |
2291 | * We do this in two parts, like we do device_register(). First, |
2292 | * we remove it from all the subsystems with device_del(), then | |
2293 | * we decrement the reference count via put_device(). If that | |
2294 | * is the final reference count, the device will be cleaned up | |
2295 | * via device_release() above. Otherwise, the structure will | |
2296 | * stick around until the final reference to the device is dropped. | |
1da177e4 | 2297 | */ |
4a3ad20c | 2298 | void device_unregister(struct device *dev) |
1da177e4 | 2299 | { |
1e0b2cf9 | 2300 | pr_debug("device: '%s': %s\n", dev_name(dev), __func__); |
1da177e4 LT |
2301 | device_del(dev); |
2302 | put_device(dev); | |
2303 | } | |
86df2687 | 2304 | EXPORT_SYMBOL_GPL(device_unregister); |
1da177e4 | 2305 | |
3d060aeb AS |
2306 | static struct device *prev_device(struct klist_iter *i) |
2307 | { | |
2308 | struct klist_node *n = klist_prev(i); | |
2309 | struct device *dev = NULL; | |
2310 | struct device_private *p; | |
2311 | ||
2312 | if (n) { | |
2313 | p = to_device_private_parent(n); | |
2314 | dev = p->device; | |
2315 | } | |
2316 | return dev; | |
2317 | } | |
2318 | ||
4a3ad20c | 2319 | static struct device *next_device(struct klist_iter *i) |
36239577 | 2320 | { |
4a3ad20c | 2321 | struct klist_node *n = klist_next(i); |
f791b8c8 GKH |
2322 | struct device *dev = NULL; |
2323 | struct device_private *p; | |
2324 | ||
2325 | if (n) { | |
2326 | p = to_device_private_parent(n); | |
2327 | dev = p->device; | |
2328 | } | |
2329 | return dev; | |
36239577 PM |
2330 | } |
2331 | ||
6fcf53ac | 2332 | /** |
e454cea2 | 2333 | * device_get_devnode - path of device node file |
6fcf53ac | 2334 | * @dev: device |
e454cea2 | 2335 | * @mode: returned file access mode |
3c2670e6 KS |
2336 | * @uid: returned file owner |
2337 | * @gid: returned file group | |
6fcf53ac KS |
2338 | * @tmp: possibly allocated string |
2339 | * | |
2340 | * Return the relative path of a possible device node. | |
2341 | * Non-default names may need to allocate a memory to compose | |
2342 | * a name. This memory is returned in tmp and needs to be | |
2343 | * freed by the caller. | |
2344 | */ | |
e454cea2 | 2345 | const char *device_get_devnode(struct device *dev, |
4e4098a3 | 2346 | umode_t *mode, kuid_t *uid, kgid_t *gid, |
3c2670e6 | 2347 | const char **tmp) |
6fcf53ac KS |
2348 | { |
2349 | char *s; | |
2350 | ||
2351 | *tmp = NULL; | |
2352 | ||
2353 | /* the device type may provide a specific name */ | |
e454cea2 | 2354 | if (dev->type && dev->type->devnode) |
3c2670e6 | 2355 | *tmp = dev->type->devnode(dev, mode, uid, gid); |
6fcf53ac KS |
2356 | if (*tmp) |
2357 | return *tmp; | |
2358 | ||
2359 | /* the class may provide a specific name */ | |
e454cea2 KS |
2360 | if (dev->class && dev->class->devnode) |
2361 | *tmp = dev->class->devnode(dev, mode); | |
6fcf53ac KS |
2362 | if (*tmp) |
2363 | return *tmp; | |
2364 | ||
2365 | /* return name without allocation, tmp == NULL */ | |
2366 | if (strchr(dev_name(dev), '!') == NULL) | |
2367 | return dev_name(dev); | |
2368 | ||
2369 | /* replace '!' in the name with '/' */ | |
a29fd614 RV |
2370 | s = kstrdup(dev_name(dev), GFP_KERNEL); |
2371 | if (!s) | |
6fcf53ac | 2372 | return NULL; |
a29fd614 RV |
2373 | strreplace(s, '!', '/'); |
2374 | return *tmp = s; | |
6fcf53ac KS |
2375 | } |
2376 | ||
1da177e4 | 2377 | /** |
4a3ad20c GKH |
2378 | * device_for_each_child - device child iterator. |
2379 | * @parent: parent struct device. | |
4a3ad20c | 2380 | * @fn: function to be called for each device. |
f8878dcb | 2381 | * @data: data for the callback. |
1da177e4 | 2382 | * |
4a3ad20c GKH |
2383 | * Iterate over @parent's child devices, and call @fn for each, |
2384 | * passing it @data. | |
1da177e4 | 2385 | * |
4a3ad20c GKH |
2386 | * We check the return of @fn each time. If it returns anything |
2387 | * other than 0, we break out and return that value. | |
1da177e4 | 2388 | */ |
4a3ad20c GKH |
2389 | int device_for_each_child(struct device *parent, void *data, |
2390 | int (*fn)(struct device *dev, void *data)) | |
1da177e4 | 2391 | { |
36239577 | 2392 | struct klist_iter i; |
4a3ad20c | 2393 | struct device *child; |
1da177e4 LT |
2394 | int error = 0; |
2395 | ||
014c90db GKH |
2396 | if (!parent->p) |
2397 | return 0; | |
2398 | ||
f791b8c8 | 2399 | klist_iter_init(&parent->p->klist_children, &i); |
93ead7c9 | 2400 | while (!error && (child = next_device(&i))) |
36239577 PM |
2401 | error = fn(child, data); |
2402 | klist_iter_exit(&i); | |
1da177e4 LT |
2403 | return error; |
2404 | } | |
86df2687 | 2405 | EXPORT_SYMBOL_GPL(device_for_each_child); |
1da177e4 | 2406 | |
3d060aeb AS |
2407 | /** |
2408 | * device_for_each_child_reverse - device child iterator in reversed order. | |
2409 | * @parent: parent struct device. | |
2410 | * @fn: function to be called for each device. | |
2411 | * @data: data for the callback. | |
2412 | * | |
2413 | * Iterate over @parent's child devices, and call @fn for each, | |
2414 | * passing it @data. | |
2415 | * | |
2416 | * We check the return of @fn each time. If it returns anything | |
2417 | * other than 0, we break out and return that value. | |
2418 | */ | |
2419 | int device_for_each_child_reverse(struct device *parent, void *data, | |
2420 | int (*fn)(struct device *dev, void *data)) | |
2421 | { | |
2422 | struct klist_iter i; | |
2423 | struct device *child; | |
2424 | int error = 0; | |
2425 | ||
2426 | if (!parent->p) | |
2427 | return 0; | |
2428 | ||
2429 | klist_iter_init(&parent->p->klist_children, &i); | |
2430 | while ((child = prev_device(&i)) && !error) | |
2431 | error = fn(child, data); | |
2432 | klist_iter_exit(&i); | |
2433 | return error; | |
2434 | } | |
2435 | EXPORT_SYMBOL_GPL(device_for_each_child_reverse); | |
2436 | ||
5ab69981 CH |
2437 | /** |
2438 | * device_find_child - device iterator for locating a particular device. | |
2439 | * @parent: parent struct device | |
5ab69981 | 2440 | * @match: Callback function to check device |
f8878dcb | 2441 | * @data: Data to pass to match function |
5ab69981 CH |
2442 | * |
2443 | * This is similar to the device_for_each_child() function above, but it | |
2444 | * returns a reference to a device that is 'found' for later use, as | |
2445 | * determined by the @match callback. | |
2446 | * | |
2447 | * The callback should return 0 if the device doesn't match and non-zero | |
2448 | * if it does. If the callback returns non-zero and a reference to the | |
2449 | * current device can be obtained, this function will return to the caller | |
2450 | * and not iterate over any more devices. | |
a4e2400a FV |
2451 | * |
2452 | * NOTE: you will need to drop the reference with put_device() after use. | |
5ab69981 | 2453 | */ |
4a3ad20c GKH |
2454 | struct device *device_find_child(struct device *parent, void *data, |
2455 | int (*match)(struct device *dev, void *data)) | |
5ab69981 CH |
2456 | { |
2457 | struct klist_iter i; | |
2458 | struct device *child; | |
2459 | ||
2460 | if (!parent) | |
2461 | return NULL; | |
2462 | ||
f791b8c8 | 2463 | klist_iter_init(&parent->p->klist_children, &i); |
5ab69981 CH |
2464 | while ((child = next_device(&i))) |
2465 | if (match(child, data) && get_device(child)) | |
2466 | break; | |
2467 | klist_iter_exit(&i); | |
2468 | return child; | |
2469 | } | |
86df2687 | 2470 | EXPORT_SYMBOL_GPL(device_find_child); |
5ab69981 | 2471 | |
1da177e4 LT |
2472 | int __init devices_init(void) |
2473 | { | |
881c6cfd GKH |
2474 | devices_kset = kset_create_and_add("devices", &device_uevent_ops, NULL); |
2475 | if (!devices_kset) | |
2476 | return -ENOMEM; | |
e105b8bf DW |
2477 | dev_kobj = kobject_create_and_add("dev", NULL); |
2478 | if (!dev_kobj) | |
2479 | goto dev_kobj_err; | |
2480 | sysfs_dev_block_kobj = kobject_create_and_add("block", dev_kobj); | |
2481 | if (!sysfs_dev_block_kobj) | |
2482 | goto block_kobj_err; | |
2483 | sysfs_dev_char_kobj = kobject_create_and_add("char", dev_kobj); | |
2484 | if (!sysfs_dev_char_kobj) | |
2485 | goto char_kobj_err; | |
2486 | ||
881c6cfd | 2487 | return 0; |
e105b8bf DW |
2488 | |
2489 | char_kobj_err: | |
2490 | kobject_put(sysfs_dev_block_kobj); | |
2491 | block_kobj_err: | |
2492 | kobject_put(dev_kobj); | |
2493 | dev_kobj_err: | |
2494 | kset_unregister(devices_kset); | |
2495 | return -ENOMEM; | |
1da177e4 LT |
2496 | } |
2497 | ||
4f3549d7 RW |
2498 | static int device_check_offline(struct device *dev, void *not_used) |
2499 | { | |
2500 | int ret; | |
2501 | ||
2502 | ret = device_for_each_child(dev, NULL, device_check_offline); | |
2503 | if (ret) | |
2504 | return ret; | |
2505 | ||
2506 | return device_supports_offline(dev) && !dev->offline ? -EBUSY : 0; | |
2507 | } | |
2508 | ||
2509 | /** | |
2510 | * device_offline - Prepare the device for hot-removal. | |
2511 | * @dev: Device to be put offline. | |
2512 | * | |
2513 | * Execute the device bus type's .offline() callback, if present, to prepare | |
2514 | * the device for a subsequent hot-removal. If that succeeds, the device must | |
2515 | * not be used until either it is removed or its bus type's .online() callback | |
2516 | * is executed. | |
2517 | * | |
2518 | * Call under device_hotplug_lock. | |
2519 | */ | |
2520 | int device_offline(struct device *dev) | |
2521 | { | |
2522 | int ret; | |
2523 | ||
2524 | if (dev->offline_disabled) | |
2525 | return -EPERM; | |
2526 | ||
2527 | ret = device_for_each_child(dev, NULL, device_check_offline); | |
2528 | if (ret) | |
2529 | return ret; | |
2530 | ||
2531 | device_lock(dev); | |
2532 | if (device_supports_offline(dev)) { | |
2533 | if (dev->offline) { | |
2534 | ret = 1; | |
2535 | } else { | |
2536 | ret = dev->bus->offline(dev); | |
2537 | if (!ret) { | |
2538 | kobject_uevent(&dev->kobj, KOBJ_OFFLINE); | |
2539 | dev->offline = true; | |
2540 | } | |
2541 | } | |
2542 | } | |
2543 | device_unlock(dev); | |
2544 | ||
2545 | return ret; | |
2546 | } | |
2547 | ||
2548 | /** | |
2549 | * device_online - Put the device back online after successful device_offline(). | |
2550 | * @dev: Device to be put back online. | |
2551 | * | |
2552 | * If device_offline() has been successfully executed for @dev, but the device | |
2553 | * has not been removed subsequently, execute its bus type's .online() callback | |
2554 | * to indicate that the device can be used again. | |
2555 | * | |
2556 | * Call under device_hotplug_lock. | |
2557 | */ | |
2558 | int device_online(struct device *dev) | |
2559 | { | |
2560 | int ret = 0; | |
2561 | ||
2562 | device_lock(dev); | |
2563 | if (device_supports_offline(dev)) { | |
2564 | if (dev->offline) { | |
2565 | ret = dev->bus->online(dev); | |
2566 | if (!ret) { | |
2567 | kobject_uevent(&dev->kobj, KOBJ_ONLINE); | |
2568 | dev->offline = false; | |
2569 | } | |
2570 | } else { | |
2571 | ret = 1; | |
2572 | } | |
2573 | } | |
2574 | device_unlock(dev); | |
2575 | ||
2576 | return ret; | |
2577 | } | |
2578 | ||
7f100d15 | 2579 | struct root_device { |
0aa0dc41 MM |
2580 | struct device dev; |
2581 | struct module *owner; | |
2582 | }; | |
2583 | ||
93058424 | 2584 | static inline struct root_device *to_root_device(struct device *d) |
481e2079 FW |
2585 | { |
2586 | return container_of(d, struct root_device, dev); | |
2587 | } | |
0aa0dc41 MM |
2588 | |
2589 | static void root_device_release(struct device *dev) | |
2590 | { | |
2591 | kfree(to_root_device(dev)); | |
2592 | } | |
2593 | ||
2594 | /** | |
2595 | * __root_device_register - allocate and register a root device | |
2596 | * @name: root device name | |
2597 | * @owner: owner module of the root device, usually THIS_MODULE | |
2598 | * | |
2599 | * This function allocates a root device and registers it | |
2600 | * using device_register(). In order to free the returned | |
2601 | * device, use root_device_unregister(). | |
2602 | * | |
2603 | * Root devices are dummy devices which allow other devices | |
2604 | * to be grouped under /sys/devices. Use this function to | |
2605 | * allocate a root device and then use it as the parent of | |
2606 | * any device which should appear under /sys/devices/{name} | |
2607 | * | |
2608 | * The /sys/devices/{name} directory will also contain a | |
2609 | * 'module' symlink which points to the @owner directory | |
2610 | * in sysfs. | |
2611 | * | |
f0eae0ed JN |
2612 | * Returns &struct device pointer on success, or ERR_PTR() on error. |
2613 | * | |
0aa0dc41 MM |
2614 | * Note: You probably want to use root_device_register(). |
2615 | */ | |
2616 | struct device *__root_device_register(const char *name, struct module *owner) | |
2617 | { | |
2618 | struct root_device *root; | |
2619 | int err = -ENOMEM; | |
2620 | ||
2621 | root = kzalloc(sizeof(struct root_device), GFP_KERNEL); | |
2622 | if (!root) | |
2623 | return ERR_PTR(err); | |
2624 | ||
acc0e90f | 2625 | err = dev_set_name(&root->dev, "%s", name); |
0aa0dc41 MM |
2626 | if (err) { |
2627 | kfree(root); | |
2628 | return ERR_PTR(err); | |
2629 | } | |
2630 | ||
2631 | root->dev.release = root_device_release; | |
2632 | ||
2633 | err = device_register(&root->dev); | |
2634 | if (err) { | |
2635 | put_device(&root->dev); | |
2636 | return ERR_PTR(err); | |
2637 | } | |
2638 | ||
1d9e882b | 2639 | #ifdef CONFIG_MODULES /* gotta find a "cleaner" way to do this */ |
0aa0dc41 MM |
2640 | if (owner) { |
2641 | struct module_kobject *mk = &owner->mkobj; | |
2642 | ||
2643 | err = sysfs_create_link(&root->dev.kobj, &mk->kobj, "module"); | |
2644 | if (err) { | |
2645 | device_unregister(&root->dev); | |
2646 | return ERR_PTR(err); | |
2647 | } | |
2648 | root->owner = owner; | |
2649 | } | |
2650 | #endif | |
2651 | ||
2652 | return &root->dev; | |
2653 | } | |
2654 | EXPORT_SYMBOL_GPL(__root_device_register); | |
2655 | ||
2656 | /** | |
2657 | * root_device_unregister - unregister and free a root device | |
7cbcf225 | 2658 | * @dev: device going away |
0aa0dc41 MM |
2659 | * |
2660 | * This function unregisters and cleans up a device that was created by | |
2661 | * root_device_register(). | |
2662 | */ | |
2663 | void root_device_unregister(struct device *dev) | |
2664 | { | |
2665 | struct root_device *root = to_root_device(dev); | |
2666 | ||
2667 | if (root->owner) | |
2668 | sysfs_remove_link(&root->dev.kobj, "module"); | |
2669 | ||
2670 | device_unregister(dev); | |
2671 | } | |
2672 | EXPORT_SYMBOL_GPL(root_device_unregister); | |
2673 | ||
23681e47 GKH |
2674 | |
2675 | static void device_create_release(struct device *dev) | |
2676 | { | |
1e0b2cf9 | 2677 | pr_debug("device: '%s': %s\n", dev_name(dev), __func__); |
23681e47 GKH |
2678 | kfree(dev); |
2679 | } | |
2680 | ||
6a8b55d7 | 2681 | static __printf(6, 0) struct device * |
39ef3112 GR |
2682 | device_create_groups_vargs(struct class *class, struct device *parent, |
2683 | dev_t devt, void *drvdata, | |
2684 | const struct attribute_group **groups, | |
2685 | const char *fmt, va_list args) | |
23681e47 | 2686 | { |
23681e47 GKH |
2687 | struct device *dev = NULL; |
2688 | int retval = -ENODEV; | |
2689 | ||
2690 | if (class == NULL || IS_ERR(class)) | |
2691 | goto error; | |
23681e47 GKH |
2692 | |
2693 | dev = kzalloc(sizeof(*dev), GFP_KERNEL); | |
2694 | if (!dev) { | |
2695 | retval = -ENOMEM; | |
2696 | goto error; | |
2697 | } | |
2698 | ||
bbc780f8 | 2699 | device_initialize(dev); |
23681e47 GKH |
2700 | dev->devt = devt; |
2701 | dev->class = class; | |
2702 | dev->parent = parent; | |
39ef3112 | 2703 | dev->groups = groups; |
23681e47 | 2704 | dev->release = device_create_release; |
8882b394 | 2705 | dev_set_drvdata(dev, drvdata); |
23681e47 | 2706 | |
1fa5ae85 KS |
2707 | retval = kobject_set_name_vargs(&dev->kobj, fmt, args); |
2708 | if (retval) | |
2709 | goto error; | |
2710 | ||
bbc780f8 | 2711 | retval = device_add(dev); |
23681e47 GKH |
2712 | if (retval) |
2713 | goto error; | |
2714 | ||
23681e47 GKH |
2715 | return dev; |
2716 | ||
2717 | error: | |
286661b3 | 2718 | put_device(dev); |
23681e47 GKH |
2719 | return ERR_PTR(retval); |
2720 | } | |
39ef3112 GR |
2721 | |
2722 | /** | |
2723 | * device_create_vargs - creates a device and registers it with sysfs | |
2724 | * @class: pointer to the struct class that this device should be registered to | |
2725 | * @parent: pointer to the parent struct device of this new device, if any | |
2726 | * @devt: the dev_t for the char device to be added | |
2727 | * @drvdata: the data to be added to the device for callbacks | |
2728 | * @fmt: string for the device's name | |
2729 | * @args: va_list for the device's name | |
2730 | * | |
2731 | * This function can be used by char device classes. A struct device | |
2732 | * will be created in sysfs, registered to the specified class. | |
2733 | * | |
2734 | * A "dev" file will be created, showing the dev_t for the device, if | |
2735 | * the dev_t is not 0,0. | |
2736 | * If a pointer to a parent struct device is passed in, the newly created | |
2737 | * struct device will be a child of that device in sysfs. | |
2738 | * The pointer to the struct device will be returned from the call. | |
2739 | * Any further sysfs files that might be required can be created using this | |
2740 | * pointer. | |
2741 | * | |
2742 | * Returns &struct device pointer on success, or ERR_PTR() on error. | |
2743 | * | |
2744 | * Note: the struct class passed to this function must have previously | |
2745 | * been created with a call to class_create(). | |
2746 | */ | |
2747 | struct device *device_create_vargs(struct class *class, struct device *parent, | |
2748 | dev_t devt, void *drvdata, const char *fmt, | |
2749 | va_list args) | |
2750 | { | |
2751 | return device_create_groups_vargs(class, parent, devt, drvdata, NULL, | |
2752 | fmt, args); | |
2753 | } | |
8882b394 GKH |
2754 | EXPORT_SYMBOL_GPL(device_create_vargs); |
2755 | ||
2756 | /** | |
4e106739 | 2757 | * device_create - creates a device and registers it with sysfs |
8882b394 GKH |
2758 | * @class: pointer to the struct class that this device should be registered to |
2759 | * @parent: pointer to the parent struct device of this new device, if any | |
2760 | * @devt: the dev_t for the char device to be added | |
2761 | * @drvdata: the data to be added to the device for callbacks | |
2762 | * @fmt: string for the device's name | |
2763 | * | |
2764 | * This function can be used by char device classes. A struct device | |
2765 | * will be created in sysfs, registered to the specified class. | |
2766 | * | |
2767 | * A "dev" file will be created, showing the dev_t for the device, if | |
2768 | * the dev_t is not 0,0. | |
2769 | * If a pointer to a parent struct device is passed in, the newly created | |
2770 | * struct device will be a child of that device in sysfs. | |
2771 | * The pointer to the struct device will be returned from the call. | |
2772 | * Any further sysfs files that might be required can be created using this | |
2773 | * pointer. | |
2774 | * | |
f0eae0ed JN |
2775 | * Returns &struct device pointer on success, or ERR_PTR() on error. |
2776 | * | |
8882b394 GKH |
2777 | * Note: the struct class passed to this function must have previously |
2778 | * been created with a call to class_create(). | |
2779 | */ | |
4e106739 GKH |
2780 | struct device *device_create(struct class *class, struct device *parent, |
2781 | dev_t devt, void *drvdata, const char *fmt, ...) | |
8882b394 GKH |
2782 | { |
2783 | va_list vargs; | |
2784 | struct device *dev; | |
2785 | ||
2786 | va_start(vargs, fmt); | |
2787 | dev = device_create_vargs(class, parent, devt, drvdata, fmt, vargs); | |
2788 | va_end(vargs); | |
2789 | return dev; | |
2790 | } | |
4e106739 | 2791 | EXPORT_SYMBOL_GPL(device_create); |
8882b394 | 2792 | |
39ef3112 GR |
2793 | /** |
2794 | * device_create_with_groups - creates a device and registers it with sysfs | |
2795 | * @class: pointer to the struct class that this device should be registered to | |
2796 | * @parent: pointer to the parent struct device of this new device, if any | |
2797 | * @devt: the dev_t for the char device to be added | |
2798 | * @drvdata: the data to be added to the device for callbacks | |
2799 | * @groups: NULL-terminated list of attribute groups to be created | |
2800 | * @fmt: string for the device's name | |
2801 | * | |
2802 | * This function can be used by char device classes. A struct device | |
2803 | * will be created in sysfs, registered to the specified class. | |
2804 | * Additional attributes specified in the groups parameter will also | |
2805 | * be created automatically. | |
2806 | * | |
2807 | * A "dev" file will be created, showing the dev_t for the device, if | |
2808 | * the dev_t is not 0,0. | |
2809 | * If a pointer to a parent struct device is passed in, the newly created | |
2810 | * struct device will be a child of that device in sysfs. | |
2811 | * The pointer to the struct device will be returned from the call. | |
2812 | * Any further sysfs files that might be required can be created using this | |
2813 | * pointer. | |
2814 | * | |
2815 | * Returns &struct device pointer on success, or ERR_PTR() on error. | |
2816 | * | |
2817 | * Note: the struct class passed to this function must have previously | |
2818 | * been created with a call to class_create(). | |
2819 | */ | |
2820 | struct device *device_create_with_groups(struct class *class, | |
2821 | struct device *parent, dev_t devt, | |
2822 | void *drvdata, | |
2823 | const struct attribute_group **groups, | |
2824 | const char *fmt, ...) | |
2825 | { | |
2826 | va_list vargs; | |
2827 | struct device *dev; | |
2828 | ||
2829 | va_start(vargs, fmt); | |
2830 | dev = device_create_groups_vargs(class, parent, devt, drvdata, groups, | |
2831 | fmt, vargs); | |
2832 | va_end(vargs); | |
2833 | return dev; | |
2834 | } | |
2835 | EXPORT_SYMBOL_GPL(device_create_with_groups); | |
2836 | ||
9f3b795a | 2837 | static int __match_devt(struct device *dev, const void *data) |
23681e47 | 2838 | { |
9f3b795a | 2839 | const dev_t *devt = data; |
23681e47 | 2840 | |
cd35449b | 2841 | return dev->devt == *devt; |
775b64d2 RW |
2842 | } |
2843 | ||
2844 | /** | |
2845 | * device_destroy - removes a device that was created with device_create() | |
2846 | * @class: pointer to the struct class that this device was registered with | |
2847 | * @devt: the dev_t of the device that was previously registered | |
2848 | * | |
2849 | * This call unregisters and cleans up a device that was created with a | |
2850 | * call to device_create(). | |
2851 | */ | |
2852 | void device_destroy(struct class *class, dev_t devt) | |
2853 | { | |
2854 | struct device *dev; | |
23681e47 | 2855 | |
695794ae | 2856 | dev = class_find_device(class, NULL, &devt, __match_devt); |
cd35449b DY |
2857 | if (dev) { |
2858 | put_device(dev); | |
23681e47 | 2859 | device_unregister(dev); |
cd35449b | 2860 | } |
23681e47 GKH |
2861 | } |
2862 | EXPORT_SYMBOL_GPL(device_destroy); | |
a2de48ca GKH |
2863 | |
2864 | /** | |
2865 | * device_rename - renames a device | |
2866 | * @dev: the pointer to the struct device to be renamed | |
2867 | * @new_name: the new name of the device | |
030c1d2b EB |
2868 | * |
2869 | * It is the responsibility of the caller to provide mutual | |
2870 | * exclusion between two different calls of device_rename | |
2871 | * on the same device to ensure that new_name is valid and | |
2872 | * won't conflict with other devices. | |
c6c0ac66 | 2873 | * |
a5462516 TT |
2874 | * Note: Don't call this function. Currently, the networking layer calls this |
2875 | * function, but that will change. The following text from Kay Sievers offers | |
2876 | * some insight: | |
2877 | * | |
2878 | * Renaming devices is racy at many levels, symlinks and other stuff are not | |
2879 | * replaced atomically, and you get a "move" uevent, but it's not easy to | |
2880 | * connect the event to the old and new device. Device nodes are not renamed at | |
2881 | * all, there isn't even support for that in the kernel now. | |
2882 | * | |
2883 | * In the meantime, during renaming, your target name might be taken by another | |
2884 | * driver, creating conflicts. Or the old name is taken directly after you | |
2885 | * renamed it -- then you get events for the same DEVPATH, before you even see | |
2886 | * the "move" event. It's just a mess, and nothing new should ever rely on | |
2887 | * kernel device renaming. Besides that, it's not even implemented now for | |
2888 | * other things than (driver-core wise very simple) network devices. | |
2889 | * | |
2890 | * We are currently about to change network renaming in udev to completely | |
2891 | * disallow renaming of devices in the same namespace as the kernel uses, | |
2892 | * because we can't solve the problems properly, that arise with swapping names | |
2893 | * of multiple interfaces without races. Means, renaming of eth[0-9]* will only | |
2894 | * be allowed to some other name than eth[0-9]*, for the aforementioned | |
2895 | * reasons. | |
2896 | * | |
2897 | * Make up a "real" name in the driver before you register anything, or add | |
2898 | * some other attributes for userspace to find the device, or use udev to add | |
2899 | * symlinks -- but never rename kernel devices later, it's a complete mess. We | |
2900 | * don't even want to get into that and try to implement the missing pieces in | |
2901 | * the core. We really have other pieces to fix in the driver core mess. :) | |
a2de48ca | 2902 | */ |
6937e8f8 | 2903 | int device_rename(struct device *dev, const char *new_name) |
a2de48ca | 2904 | { |
4b30ee58 | 2905 | struct kobject *kobj = &dev->kobj; |
2ee97caf | 2906 | char *old_device_name = NULL; |
a2de48ca GKH |
2907 | int error; |
2908 | ||
2909 | dev = get_device(dev); | |
2910 | if (!dev) | |
2911 | return -EINVAL; | |
2912 | ||
69df7533 | 2913 | dev_dbg(dev, "renaming to %s\n", new_name); |
a2de48ca | 2914 | |
1fa5ae85 | 2915 | old_device_name = kstrdup(dev_name(dev), GFP_KERNEL); |
2ee97caf CH |
2916 | if (!old_device_name) { |
2917 | error = -ENOMEM; | |
2918 | goto out; | |
a2de48ca | 2919 | } |
a2de48ca | 2920 | |
f349cf34 | 2921 | if (dev->class) { |
4b30ee58 TH |
2922 | error = sysfs_rename_link_ns(&dev->class->p->subsys.kobj, |
2923 | kobj, old_device_name, | |
2924 | new_name, kobject_namespace(kobj)); | |
f349cf34 EB |
2925 | if (error) |
2926 | goto out; | |
2927 | } | |
39aba963 | 2928 | |
4b30ee58 | 2929 | error = kobject_rename(kobj, new_name); |
1fa5ae85 | 2930 | if (error) |
2ee97caf | 2931 | goto out; |
a2de48ca | 2932 | |
2ee97caf | 2933 | out: |
a2de48ca GKH |
2934 | put_device(dev); |
2935 | ||
2ee97caf | 2936 | kfree(old_device_name); |
a2de48ca GKH |
2937 | |
2938 | return error; | |
2939 | } | |
a2807dbc | 2940 | EXPORT_SYMBOL_GPL(device_rename); |
8a82472f CH |
2941 | |
2942 | static int device_move_class_links(struct device *dev, | |
2943 | struct device *old_parent, | |
2944 | struct device *new_parent) | |
2945 | { | |
f7f3461d | 2946 | int error = 0; |
8a82472f | 2947 | |
f7f3461d GKH |
2948 | if (old_parent) |
2949 | sysfs_remove_link(&dev->kobj, "device"); | |
2950 | if (new_parent) | |
2951 | error = sysfs_create_link(&dev->kobj, &new_parent->kobj, | |
2952 | "device"); | |
2953 | return error; | |
8a82472f CH |
2954 | } |
2955 | ||
2956 | /** | |
2957 | * device_move - moves a device to a new parent | |
2958 | * @dev: the pointer to the struct device to be moved | |
13509860 | 2959 | * @new_parent: the new parent of the device (can be NULL) |
ffa6a705 | 2960 | * @dpm_order: how to reorder the dpm_list |
8a82472f | 2961 | */ |
ffa6a705 CH |
2962 | int device_move(struct device *dev, struct device *new_parent, |
2963 | enum dpm_order dpm_order) | |
8a82472f CH |
2964 | { |
2965 | int error; | |
2966 | struct device *old_parent; | |
c744aeae | 2967 | struct kobject *new_parent_kobj; |
8a82472f CH |
2968 | |
2969 | dev = get_device(dev); | |
2970 | if (!dev) | |
2971 | return -EINVAL; | |
2972 | ||
ffa6a705 | 2973 | device_pm_lock(); |
8a82472f | 2974 | new_parent = get_device(new_parent); |
4a3ad20c | 2975 | new_parent_kobj = get_device_parent(dev, new_parent); |
84d0c27d TH |
2976 | if (IS_ERR(new_parent_kobj)) { |
2977 | error = PTR_ERR(new_parent_kobj); | |
2978 | put_device(new_parent); | |
2979 | goto out; | |
2980 | } | |
63b6971a | 2981 | |
1e0b2cf9 KS |
2982 | pr_debug("device: '%s': %s: moving to '%s'\n", dev_name(dev), |
2983 | __func__, new_parent ? dev_name(new_parent) : "<NULL>"); | |
c744aeae | 2984 | error = kobject_move(&dev->kobj, new_parent_kobj); |
8a82472f | 2985 | if (error) { |
63b6971a | 2986 | cleanup_glue_dir(dev, new_parent_kobj); |
8a82472f CH |
2987 | put_device(new_parent); |
2988 | goto out; | |
2989 | } | |
2990 | old_parent = dev->parent; | |
2991 | dev->parent = new_parent; | |
2992 | if (old_parent) | |
f791b8c8 | 2993 | klist_remove(&dev->p->knode_parent); |
0d358f22 | 2994 | if (new_parent) { |
f791b8c8 GKH |
2995 | klist_add_tail(&dev->p->knode_parent, |
2996 | &new_parent->p->klist_children); | |
0d358f22 YL |
2997 | set_dev_node(dev, dev_to_node(new_parent)); |
2998 | } | |
2999 | ||
bdd4034d RV |
3000 | if (dev->class) { |
3001 | error = device_move_class_links(dev, old_parent, new_parent); | |
3002 | if (error) { | |
3003 | /* We ignore errors on cleanup since we're hosed anyway... */ | |
3004 | device_move_class_links(dev, new_parent, old_parent); | |
3005 | if (!kobject_move(&dev->kobj, &old_parent->kobj)) { | |
3006 | if (new_parent) | |
3007 | klist_remove(&dev->p->knode_parent); | |
3008 | dev->parent = old_parent; | |
3009 | if (old_parent) { | |
3010 | klist_add_tail(&dev->p->knode_parent, | |
3011 | &old_parent->p->klist_children); | |
3012 | set_dev_node(dev, dev_to_node(old_parent)); | |
3013 | } | |
0d358f22 | 3014 | } |
bdd4034d RV |
3015 | cleanup_glue_dir(dev, new_parent_kobj); |
3016 | put_device(new_parent); | |
3017 | goto out; | |
8a82472f | 3018 | } |
8a82472f | 3019 | } |
ffa6a705 CH |
3020 | switch (dpm_order) { |
3021 | case DPM_ORDER_NONE: | |
3022 | break; | |
3023 | case DPM_ORDER_DEV_AFTER_PARENT: | |
3024 | device_pm_move_after(dev, new_parent); | |
52cdbdd4 | 3025 | devices_kset_move_after(dev, new_parent); |
ffa6a705 CH |
3026 | break; |
3027 | case DPM_ORDER_PARENT_BEFORE_DEV: | |
3028 | device_pm_move_before(new_parent, dev); | |
52cdbdd4 | 3029 | devices_kset_move_before(new_parent, dev); |
ffa6a705 CH |
3030 | break; |
3031 | case DPM_ORDER_DEV_LAST: | |
3032 | device_pm_move_last(dev); | |
52cdbdd4 | 3033 | devices_kset_move_last(dev); |
ffa6a705 CH |
3034 | break; |
3035 | } | |
bdd4034d | 3036 | |
8a82472f CH |
3037 | put_device(old_parent); |
3038 | out: | |
ffa6a705 | 3039 | device_pm_unlock(); |
8a82472f CH |
3040 | put_device(dev); |
3041 | return error; | |
3042 | } | |
8a82472f | 3043 | EXPORT_SYMBOL_GPL(device_move); |
37b0c020 GKH |
3044 | |
3045 | /** | |
3046 | * device_shutdown - call ->shutdown() on each device to shutdown. | |
3047 | */ | |
3048 | void device_shutdown(void) | |
3049 | { | |
f123db8e | 3050 | struct device *dev, *parent; |
6245838f | 3051 | |
3297c8fc PL |
3052 | wait_for_device_probe(); |
3053 | device_block_probing(); | |
3054 | ||
6245838f HD |
3055 | spin_lock(&devices_kset->list_lock); |
3056 | /* | |
3057 | * Walk the devices list backward, shutting down each in turn. | |
3058 | * Beware that device unplug events may also start pulling | |
3059 | * devices offline, even as the system is shutting down. | |
3060 | */ | |
3061 | while (!list_empty(&devices_kset->list)) { | |
3062 | dev = list_entry(devices_kset->list.prev, struct device, | |
3063 | kobj.entry); | |
d1c6c030 ML |
3064 | |
3065 | /* | |
3066 | * hold reference count of device's parent to | |
3067 | * prevent it from being freed because parent's | |
3068 | * lock is to be held | |
3069 | */ | |
f123db8e | 3070 | parent = get_device(dev->parent); |
6245838f HD |
3071 | get_device(dev); |
3072 | /* | |
3073 | * Make sure the device is off the kset list, in the | |
3074 | * event that dev->*->shutdown() doesn't remove it. | |
3075 | */ | |
3076 | list_del_init(&dev->kobj.entry); | |
3077 | spin_unlock(&devices_kset->list_lock); | |
fe6b91f4 | 3078 | |
d1c6c030 | 3079 | /* hold lock to avoid race with probe/release */ |
f123db8e BL |
3080 | if (parent) |
3081 | device_lock(parent); | |
d1c6c030 ML |
3082 | device_lock(dev); |
3083 | ||
fe6b91f4 AS |
3084 | /* Don't allow any more runtime suspends */ |
3085 | pm_runtime_get_noresume(dev); | |
3086 | pm_runtime_barrier(dev); | |
37b0c020 | 3087 | |
7521621e | 3088 | if (dev->class && dev->class->shutdown_pre) { |
f77af151 | 3089 | if (initcall_debug) |
7521621e MS |
3090 | dev_info(dev, "shutdown_pre\n"); |
3091 | dev->class->shutdown_pre(dev); | |
3092 | } | |
3093 | if (dev->bus && dev->bus->shutdown) { | |
0246c4fa SL |
3094 | if (initcall_debug) |
3095 | dev_info(dev, "shutdown\n"); | |
37b0c020 GKH |
3096 | dev->bus->shutdown(dev); |
3097 | } else if (dev->driver && dev->driver->shutdown) { | |
0246c4fa SL |
3098 | if (initcall_debug) |
3099 | dev_info(dev, "shutdown\n"); | |
37b0c020 GKH |
3100 | dev->driver->shutdown(dev); |
3101 | } | |
d1c6c030 ML |
3102 | |
3103 | device_unlock(dev); | |
f123db8e BL |
3104 | if (parent) |
3105 | device_unlock(parent); | |
d1c6c030 | 3106 | |
6245838f | 3107 | put_device(dev); |
f123db8e | 3108 | put_device(parent); |
6245838f HD |
3109 | |
3110 | spin_lock(&devices_kset->list_lock); | |
37b0c020 | 3111 | } |
6245838f | 3112 | spin_unlock(&devices_kset->list_lock); |
37b0c020 | 3113 | } |
99bcf217 JP |
3114 | |
3115 | /* | |
3116 | * Device logging functions | |
3117 | */ | |
3118 | ||
3119 | #ifdef CONFIG_PRINTK | |
666f355f JP |
3120 | static int |
3121 | create_syslog_header(const struct device *dev, char *hdr, size_t hdrlen) | |
99bcf217 | 3122 | { |
c4e00daa | 3123 | const char *subsys; |
798efc60 | 3124 | size_t pos = 0; |
99bcf217 | 3125 | |
c4e00daa KS |
3126 | if (dev->class) |
3127 | subsys = dev->class->name; | |
3128 | else if (dev->bus) | |
3129 | subsys = dev->bus->name; | |
3130 | else | |
798efc60 | 3131 | return 0; |
c4e00daa | 3132 | |
798efc60 | 3133 | pos += snprintf(hdr + pos, hdrlen - pos, "SUBSYSTEM=%s", subsys); |
655e5b7c BH |
3134 | if (pos >= hdrlen) |
3135 | goto overflow; | |
c4e00daa KS |
3136 | |
3137 | /* | |
3138 | * Add device identifier DEVICE=: | |
3139 | * b12:8 block dev_t | |
3140 | * c127:3 char dev_t | |
3141 | * n8 netdev ifindex | |
3142 | * +sound:card0 subsystem:devname | |
3143 | */ | |
3144 | if (MAJOR(dev->devt)) { | |
3145 | char c; | |
3146 | ||
3147 | if (strcmp(subsys, "block") == 0) | |
3148 | c = 'b'; | |
3149 | else | |
3150 | c = 'c'; | |
798efc60 JP |
3151 | pos++; |
3152 | pos += snprintf(hdr + pos, hdrlen - pos, | |
3153 | "DEVICE=%c%u:%u", | |
3154 | c, MAJOR(dev->devt), MINOR(dev->devt)); | |
c4e00daa KS |
3155 | } else if (strcmp(subsys, "net") == 0) { |
3156 | struct net_device *net = to_net_dev(dev); | |
3157 | ||
798efc60 JP |
3158 | pos++; |
3159 | pos += snprintf(hdr + pos, hdrlen - pos, | |
3160 | "DEVICE=n%u", net->ifindex); | |
c4e00daa | 3161 | } else { |
798efc60 JP |
3162 | pos++; |
3163 | pos += snprintf(hdr + pos, hdrlen - pos, | |
3164 | "DEVICE=+%s:%s", subsys, dev_name(dev)); | |
c4e00daa | 3165 | } |
af7f2158 | 3166 | |
655e5b7c BH |
3167 | if (pos >= hdrlen) |
3168 | goto overflow; | |
3169 | ||
798efc60 | 3170 | return pos; |
655e5b7c BH |
3171 | |
3172 | overflow: | |
3173 | dev_WARN(dev, "device/subsystem name too long"); | |
3174 | return 0; | |
798efc60 | 3175 | } |
798efc60 | 3176 | |
05e4e5b8 JP |
3177 | int dev_vprintk_emit(int level, const struct device *dev, |
3178 | const char *fmt, va_list args) | |
3179 | { | |
3180 | char hdr[128]; | |
3181 | size_t hdrlen; | |
3182 | ||
3183 | hdrlen = create_syslog_header(dev, hdr, sizeof(hdr)); | |
3184 | ||
3185 | return vprintk_emit(0, level, hdrlen ? hdr : NULL, hdrlen, fmt, args); | |
3186 | } | |
3187 | EXPORT_SYMBOL(dev_vprintk_emit); | |
3188 | ||
3189 | int dev_printk_emit(int level, const struct device *dev, const char *fmt, ...) | |
3190 | { | |
3191 | va_list args; | |
3192 | int r; | |
3193 | ||
3194 | va_start(args, fmt); | |
3195 | ||
3196 | r = dev_vprintk_emit(level, dev, fmt, args); | |
3197 | ||
3198 | va_end(args); | |
3199 | ||
3200 | return r; | |
3201 | } | |
3202 | EXPORT_SYMBOL(dev_printk_emit); | |
3203 | ||
d1f1052c | 3204 | static void __dev_printk(const char *level, const struct device *dev, |
798efc60 JP |
3205 | struct va_format *vaf) |
3206 | { | |
d1f1052c JP |
3207 | if (dev) |
3208 | dev_printk_emit(level[1] - '0', dev, "%s %s: %pV", | |
3209 | dev_driver_string(dev), dev_name(dev), vaf); | |
3210 | else | |
3211 | printk("%s(NULL device *): %pV", level, vaf); | |
99bcf217 JP |
3212 | } |
3213 | ||
d1f1052c JP |
3214 | void dev_printk(const char *level, const struct device *dev, |
3215 | const char *fmt, ...) | |
99bcf217 JP |
3216 | { |
3217 | struct va_format vaf; | |
3218 | va_list args; | |
99bcf217 JP |
3219 | |
3220 | va_start(args, fmt); | |
3221 | ||
3222 | vaf.fmt = fmt; | |
3223 | vaf.va = &args; | |
3224 | ||
d1f1052c | 3225 | __dev_printk(level, dev, &vaf); |
798efc60 | 3226 | |
99bcf217 | 3227 | va_end(args); |
99bcf217 JP |
3228 | } |
3229 | EXPORT_SYMBOL(dev_printk); | |
3230 | ||
3231 | #define define_dev_printk_level(func, kern_level) \ | |
d1f1052c | 3232 | void func(const struct device *dev, const char *fmt, ...) \ |
99bcf217 JP |
3233 | { \ |
3234 | struct va_format vaf; \ | |
3235 | va_list args; \ | |
99bcf217 JP |
3236 | \ |
3237 | va_start(args, fmt); \ | |
3238 | \ | |
3239 | vaf.fmt = fmt; \ | |
3240 | vaf.va = &args; \ | |
3241 | \ | |
d1f1052c | 3242 | __dev_printk(kern_level, dev, &vaf); \ |
798efc60 | 3243 | \ |
99bcf217 | 3244 | va_end(args); \ |
99bcf217 JP |
3245 | } \ |
3246 | EXPORT_SYMBOL(func); | |
3247 | ||
663336ee JP |
3248 | define_dev_printk_level(_dev_emerg, KERN_EMERG); |
3249 | define_dev_printk_level(_dev_alert, KERN_ALERT); | |
3250 | define_dev_printk_level(_dev_crit, KERN_CRIT); | |
3251 | define_dev_printk_level(_dev_err, KERN_ERR); | |
3252 | define_dev_printk_level(_dev_warn, KERN_WARNING); | |
3253 | define_dev_printk_level(_dev_notice, KERN_NOTICE); | |
99bcf217 JP |
3254 | define_dev_printk_level(_dev_info, KERN_INFO); |
3255 | ||
3256 | #endif | |
97badf87 RW |
3257 | |
3258 | static inline bool fwnode_is_primary(struct fwnode_handle *fwnode) | |
3259 | { | |
3260 | return fwnode && !IS_ERR(fwnode->secondary); | |
3261 | } | |
3262 | ||
3263 | /** | |
3264 | * set_primary_fwnode - Change the primary firmware node of a given device. | |
3265 | * @dev: Device to handle. | |
3266 | * @fwnode: New primary firmware node of the device. | |
3267 | * | |
3268 | * Set the device's firmware node pointer to @fwnode, but if a secondary | |
3269 | * firmware node of the device is present, preserve it. | |
3270 | */ | |
3271 | void set_primary_fwnode(struct device *dev, struct fwnode_handle *fwnode) | |
3272 | { | |
3273 | if (fwnode) { | |
3274 | struct fwnode_handle *fn = dev->fwnode; | |
3275 | ||
3276 | if (fwnode_is_primary(fn)) | |
3277 | fn = fn->secondary; | |
3278 | ||
55f89a8a MW |
3279 | if (fn) { |
3280 | WARN_ON(fwnode->secondary); | |
3281 | fwnode->secondary = fn; | |
3282 | } | |
97badf87 RW |
3283 | dev->fwnode = fwnode; |
3284 | } else { | |
3285 | dev->fwnode = fwnode_is_primary(dev->fwnode) ? | |
3286 | dev->fwnode->secondary : NULL; | |
3287 | } | |
3288 | } | |
3289 | EXPORT_SYMBOL_GPL(set_primary_fwnode); | |
3290 | ||
3291 | /** | |
3292 | * set_secondary_fwnode - Change the secondary firmware node of a given device. | |
3293 | * @dev: Device to handle. | |
3294 | * @fwnode: New secondary firmware node of the device. | |
3295 | * | |
3296 | * If a primary firmware node of the device is present, set its secondary | |
3297 | * pointer to @fwnode. Otherwise, set the device's firmware node pointer to | |
3298 | * @fwnode. | |
3299 | */ | |
3300 | void set_secondary_fwnode(struct device *dev, struct fwnode_handle *fwnode) | |
3301 | { | |
3302 | if (fwnode) | |
3303 | fwnode->secondary = ERR_PTR(-ENODEV); | |
3304 | ||
3305 | if (fwnode_is_primary(dev->fwnode)) | |
3306 | dev->fwnode->secondary = fwnode; | |
3307 | else | |
3308 | dev->fwnode = fwnode; | |
3309 | } | |
4e75e1d7 JH |
3310 | |
3311 | /** | |
3312 | * device_set_of_node_from_dev - reuse device-tree node of another device | |
3313 | * @dev: device whose device-tree node is being set | |
3314 | * @dev2: device whose device-tree node is being reused | |
3315 | * | |
3316 | * Takes another reference to the new device-tree node after first dropping | |
3317 | * any reference held to the old node. | |
3318 | */ | |
3319 | void device_set_of_node_from_dev(struct device *dev, const struct device *dev2) | |
3320 | { | |
3321 | of_node_put(dev->of_node); | |
3322 | dev->of_node = of_node_get(dev2->of_node); | |
3323 | dev->of_node_reused = true; | |
3324 | } | |
3325 | EXPORT_SYMBOL_GPL(device_set_of_node_from_dev); |