Commit | Line | Data |
---|---|---|
1da177e4 LT |
1 | /* |
2 | * drivers/base/core.c - core driver model code (device registration, etc) | |
3 | * | |
4 | * Copyright (c) 2002-3 Patrick Mochel | |
5 | * Copyright (c) 2002-3 Open Source Development Labs | |
64bb5d2c GKH |
6 | * Copyright (c) 2006 Greg Kroah-Hartman <gregkh@suse.de> |
7 | * Copyright (c) 2006 Novell, Inc. | |
1da177e4 LT |
8 | * |
9 | * This file is released under the GPLv2 | |
10 | * | |
11 | */ | |
12 | ||
1da177e4 LT |
13 | #include <linux/device.h> |
14 | #include <linux/err.h> | |
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> |
815d2d50 | 24 | #include <linux/kallsyms.h> |
f75b1c60 | 25 | #include <linux/mutex.h> |
401097ea | 26 | #include <linux/async.h> |
af8db150 | 27 | #include <linux/pm_runtime.h> |
c4e00daa | 28 | #include <linux/netdevice.h> |
63967685 | 29 | #include <linux/sysfs.h> |
1da177e4 LT |
30 | |
31 | #include "base.h" | |
32 | #include "power/power.h" | |
33 | ||
e52eec13 AK |
34 | #ifdef CONFIG_SYSFS_DEPRECATED |
35 | #ifdef CONFIG_SYSFS_DEPRECATED_V2 | |
36 | long sysfs_deprecated = 1; | |
37 | #else | |
38 | long sysfs_deprecated = 0; | |
39 | #endif | |
3454bf96 | 40 | static int __init sysfs_deprecated_setup(char *arg) |
e52eec13 | 41 | { |
34da5e67 | 42 | return kstrtol(arg, 10, &sysfs_deprecated); |
e52eec13 AK |
43 | } |
44 | early_param("sysfs.deprecated", sysfs_deprecated_setup); | |
45 | #endif | |
46 | ||
4a3ad20c GKH |
47 | int (*platform_notify)(struct device *dev) = NULL; |
48 | int (*platform_notify_remove)(struct device *dev) = NULL; | |
e105b8bf DW |
49 | static struct kobject *dev_kobj; |
50 | struct kobject *sysfs_dev_char_kobj; | |
51 | struct kobject *sysfs_dev_block_kobj; | |
1da177e4 | 52 | |
5e33bc41 RW |
53 | static DEFINE_MUTEX(device_hotplug_lock); |
54 | ||
55 | void lock_device_hotplug(void) | |
56 | { | |
57 | mutex_lock(&device_hotplug_lock); | |
58 | } | |
59 | ||
60 | void unlock_device_hotplug(void) | |
61 | { | |
62 | mutex_unlock(&device_hotplug_lock); | |
63 | } | |
64 | ||
65 | int lock_device_hotplug_sysfs(void) | |
66 | { | |
67 | if (mutex_trylock(&device_hotplug_lock)) | |
68 | return 0; | |
69 | ||
70 | /* Avoid busy looping (5 ms of sleep should do). */ | |
71 | msleep(5); | |
72 | return restart_syscall(); | |
73 | } | |
74 | ||
4e886c29 GKH |
75 | #ifdef CONFIG_BLOCK |
76 | static inline int device_is_not_partition(struct device *dev) | |
77 | { | |
78 | return !(dev->type == &part_type); | |
79 | } | |
80 | #else | |
81 | static inline int device_is_not_partition(struct device *dev) | |
82 | { | |
83 | return 1; | |
84 | } | |
85 | #endif | |
1da177e4 | 86 | |
3e95637a AS |
87 | /** |
88 | * dev_driver_string - Return a device's driver name, if at all possible | |
89 | * @dev: struct device to get the name of | |
90 | * | |
91 | * Will return the device's driver's name if it is bound to a device. If | |
9169c012 | 92 | * the device is not bound to a driver, it will return the name of the bus |
3e95637a AS |
93 | * it is attached to. If it is not attached to a bus either, an empty |
94 | * string will be returned. | |
95 | */ | |
bf9ca69f | 96 | const char *dev_driver_string(const struct device *dev) |
3e95637a | 97 | { |
3589972e AS |
98 | struct device_driver *drv; |
99 | ||
100 | /* dev->driver can change to NULL underneath us because of unbinding, | |
101 | * so be careful about accessing it. dev->bus and dev->class should | |
102 | * never change once they are set, so they don't need special care. | |
103 | */ | |
104 | drv = ACCESS_ONCE(dev->driver); | |
105 | return drv ? drv->name : | |
a456b702 JD |
106 | (dev->bus ? dev->bus->name : |
107 | (dev->class ? dev->class->name : "")); | |
3e95637a | 108 | } |
310a922d | 109 | EXPORT_SYMBOL(dev_driver_string); |
3e95637a | 110 | |
1da177e4 LT |
111 | #define to_dev_attr(_attr) container_of(_attr, struct device_attribute, attr) |
112 | ||
4a3ad20c GKH |
113 | static ssize_t dev_attr_show(struct kobject *kobj, struct attribute *attr, |
114 | char *buf) | |
1da177e4 | 115 | { |
4a3ad20c | 116 | struct device_attribute *dev_attr = to_dev_attr(attr); |
b0d1f807 | 117 | struct device *dev = kobj_to_dev(kobj); |
4a0c20bf | 118 | ssize_t ret = -EIO; |
1da177e4 LT |
119 | |
120 | if (dev_attr->show) | |
54b6f35c | 121 | ret = dev_attr->show(dev, dev_attr, buf); |
815d2d50 | 122 | if (ret >= (ssize_t)PAGE_SIZE) { |
53a9c87e GKH |
123 | print_symbol("dev_attr_show: %s returned bad count\n", |
124 | (unsigned long)dev_attr->show); | |
815d2d50 | 125 | } |
1da177e4 LT |
126 | return ret; |
127 | } | |
128 | ||
4a3ad20c GKH |
129 | static ssize_t dev_attr_store(struct kobject *kobj, struct attribute *attr, |
130 | const char *buf, size_t count) | |
1da177e4 | 131 | { |
4a3ad20c | 132 | struct device_attribute *dev_attr = to_dev_attr(attr); |
b0d1f807 | 133 | struct device *dev = kobj_to_dev(kobj); |
4a0c20bf | 134 | ssize_t ret = -EIO; |
1da177e4 LT |
135 | |
136 | if (dev_attr->store) | |
54b6f35c | 137 | ret = dev_attr->store(dev, dev_attr, buf, count); |
1da177e4 LT |
138 | return ret; |
139 | } | |
140 | ||
52cf25d0 | 141 | static const struct sysfs_ops dev_sysfs_ops = { |
1da177e4 LT |
142 | .show = dev_attr_show, |
143 | .store = dev_attr_store, | |
144 | }; | |
145 | ||
ca22e56d KS |
146 | #define to_ext_attr(x) container_of(x, struct dev_ext_attribute, attr) |
147 | ||
148 | ssize_t device_store_ulong(struct device *dev, | |
149 | struct device_attribute *attr, | |
150 | const char *buf, size_t size) | |
151 | { | |
152 | struct dev_ext_attribute *ea = to_ext_attr(attr); | |
153 | char *end; | |
154 | unsigned long new = simple_strtoul(buf, &end, 0); | |
155 | if (end == buf) | |
156 | return -EINVAL; | |
157 | *(unsigned long *)(ea->var) = new; | |
158 | /* Always return full write size even if we didn't consume all */ | |
159 | return size; | |
160 | } | |
161 | EXPORT_SYMBOL_GPL(device_store_ulong); | |
162 | ||
163 | ssize_t device_show_ulong(struct device *dev, | |
164 | struct device_attribute *attr, | |
165 | char *buf) | |
166 | { | |
167 | struct dev_ext_attribute *ea = to_ext_attr(attr); | |
168 | return snprintf(buf, PAGE_SIZE, "%lx\n", *(unsigned long *)(ea->var)); | |
169 | } | |
170 | EXPORT_SYMBOL_GPL(device_show_ulong); | |
171 | ||
172 | ssize_t device_store_int(struct device *dev, | |
173 | struct device_attribute *attr, | |
174 | const char *buf, size_t size) | |
175 | { | |
176 | struct dev_ext_attribute *ea = to_ext_attr(attr); | |
177 | char *end; | |
178 | long new = simple_strtol(buf, &end, 0); | |
179 | if (end == buf || new > INT_MAX || new < INT_MIN) | |
180 | return -EINVAL; | |
181 | *(int *)(ea->var) = new; | |
182 | /* Always return full write size even if we didn't consume all */ | |
183 | return size; | |
184 | } | |
185 | EXPORT_SYMBOL_GPL(device_store_int); | |
186 | ||
187 | ssize_t device_show_int(struct device *dev, | |
188 | struct device_attribute *attr, | |
189 | char *buf) | |
190 | { | |
191 | struct dev_ext_attribute *ea = to_ext_attr(attr); | |
192 | ||
193 | return snprintf(buf, PAGE_SIZE, "%d\n", *(int *)(ea->var)); | |
194 | } | |
195 | EXPORT_SYMBOL_GPL(device_show_int); | |
1da177e4 | 196 | |
91872392 BP |
197 | ssize_t device_store_bool(struct device *dev, struct device_attribute *attr, |
198 | const char *buf, size_t size) | |
199 | { | |
200 | struct dev_ext_attribute *ea = to_ext_attr(attr); | |
201 | ||
202 | if (strtobool(buf, ea->var) < 0) | |
203 | return -EINVAL; | |
204 | ||
205 | return size; | |
206 | } | |
207 | EXPORT_SYMBOL_GPL(device_store_bool); | |
208 | ||
209 | ssize_t device_show_bool(struct device *dev, struct device_attribute *attr, | |
210 | char *buf) | |
211 | { | |
212 | struct dev_ext_attribute *ea = to_ext_attr(attr); | |
213 | ||
214 | return snprintf(buf, PAGE_SIZE, "%d\n", *(bool *)(ea->var)); | |
215 | } | |
216 | EXPORT_SYMBOL_GPL(device_show_bool); | |
217 | ||
1da177e4 | 218 | /** |
f8878dcb RD |
219 | * device_release - free device structure. |
220 | * @kobj: device's kobject. | |
1da177e4 | 221 | * |
f8878dcb RD |
222 | * This is called once the reference count for the object |
223 | * reaches 0. We forward the call to the device's release | |
224 | * method, which should handle actually freeing the structure. | |
1da177e4 | 225 | */ |
4a3ad20c | 226 | static void device_release(struct kobject *kobj) |
1da177e4 | 227 | { |
b0d1f807 | 228 | struct device *dev = kobj_to_dev(kobj); |
fb069a5d | 229 | struct device_private *p = dev->p; |
1da177e4 | 230 | |
a525a3dd ML |
231 | /* |
232 | * Some platform devices are driven without driver attached | |
233 | * and managed resources may have been acquired. Make sure | |
234 | * all resources are released. | |
235 | * | |
236 | * Drivers still can add resources into device after device | |
237 | * is deleted but alive, so release devres here to avoid | |
238 | * possible memory leak. | |
239 | */ | |
240 | devres_release_all(dev); | |
241 | ||
1da177e4 LT |
242 | if (dev->release) |
243 | dev->release(dev); | |
f9f852df KS |
244 | else if (dev->type && dev->type->release) |
245 | dev->type->release(dev); | |
2620efef GKH |
246 | else if (dev->class && dev->class->dev_release) |
247 | dev->class->dev_release(dev); | |
f810a5cf AV |
248 | else |
249 | WARN(1, KERN_ERR "Device '%s' does not have a release() " | |
4a3ad20c | 250 | "function, it is broken and must be fixed.\n", |
1e0b2cf9 | 251 | dev_name(dev)); |
fb069a5d | 252 | kfree(p); |
1da177e4 LT |
253 | } |
254 | ||
bc451f20 EB |
255 | static const void *device_namespace(struct kobject *kobj) |
256 | { | |
b0d1f807 | 257 | struct device *dev = kobj_to_dev(kobj); |
bc451f20 EB |
258 | const void *ns = NULL; |
259 | ||
260 | if (dev->class && dev->class->ns_type) | |
261 | ns = dev->class->namespace(dev); | |
262 | ||
263 | return ns; | |
264 | } | |
265 | ||
8f4afc41 | 266 | static struct kobj_type device_ktype = { |
1da177e4 LT |
267 | .release = device_release, |
268 | .sysfs_ops = &dev_sysfs_ops, | |
bc451f20 | 269 | .namespace = device_namespace, |
1da177e4 LT |
270 | }; |
271 | ||
272 | ||
312c004d | 273 | static int dev_uevent_filter(struct kset *kset, struct kobject *kobj) |
1da177e4 LT |
274 | { |
275 | struct kobj_type *ktype = get_ktype(kobj); | |
276 | ||
8f4afc41 | 277 | if (ktype == &device_ktype) { |
b0d1f807 | 278 | struct device *dev = kobj_to_dev(kobj); |
1da177e4 LT |
279 | if (dev->bus) |
280 | return 1; | |
23681e47 GKH |
281 | if (dev->class) |
282 | return 1; | |
1da177e4 LT |
283 | } |
284 | return 0; | |
285 | } | |
286 | ||
312c004d | 287 | static const char *dev_uevent_name(struct kset *kset, struct kobject *kobj) |
1da177e4 | 288 | { |
b0d1f807 | 289 | struct device *dev = kobj_to_dev(kobj); |
1da177e4 | 290 | |
23681e47 GKH |
291 | if (dev->bus) |
292 | return dev->bus->name; | |
293 | if (dev->class) | |
294 | return dev->class->name; | |
295 | return NULL; | |
1da177e4 LT |
296 | } |
297 | ||
7eff2e7a KS |
298 | static int dev_uevent(struct kset *kset, struct kobject *kobj, |
299 | struct kobj_uevent_env *env) | |
1da177e4 | 300 | { |
b0d1f807 | 301 | struct device *dev = kobj_to_dev(kobj); |
1da177e4 LT |
302 | int retval = 0; |
303 | ||
6fcf53ac | 304 | /* add device node properties if present */ |
23681e47 | 305 | if (MAJOR(dev->devt)) { |
6fcf53ac KS |
306 | const char *tmp; |
307 | const char *name; | |
2c9ede55 | 308 | umode_t mode = 0; |
4e4098a3 GKH |
309 | kuid_t uid = GLOBAL_ROOT_UID; |
310 | kgid_t gid = GLOBAL_ROOT_GID; | |
6fcf53ac | 311 | |
7eff2e7a KS |
312 | add_uevent_var(env, "MAJOR=%u", MAJOR(dev->devt)); |
313 | add_uevent_var(env, "MINOR=%u", MINOR(dev->devt)); | |
3c2670e6 | 314 | name = device_get_devnode(dev, &mode, &uid, &gid, &tmp); |
6fcf53ac KS |
315 | if (name) { |
316 | add_uevent_var(env, "DEVNAME=%s", name); | |
e454cea2 KS |
317 | if (mode) |
318 | add_uevent_var(env, "DEVMODE=%#o", mode & 0777); | |
4e4098a3 GKH |
319 | if (!uid_eq(uid, GLOBAL_ROOT_UID)) |
320 | add_uevent_var(env, "DEVUID=%u", from_kuid(&init_user_ns, uid)); | |
321 | if (!gid_eq(gid, GLOBAL_ROOT_GID)) | |
322 | add_uevent_var(env, "DEVGID=%u", from_kgid(&init_user_ns, gid)); | |
3c2670e6 | 323 | kfree(tmp); |
6fcf53ac | 324 | } |
23681e47 GKH |
325 | } |
326 | ||
414264f9 | 327 | if (dev->type && dev->type->name) |
7eff2e7a | 328 | add_uevent_var(env, "DEVTYPE=%s", dev->type->name); |
414264f9 | 329 | |
239378f1 | 330 | if (dev->driver) |
7eff2e7a | 331 | add_uevent_var(env, "DRIVER=%s", dev->driver->name); |
239378f1 | 332 | |
07d57a32 GL |
333 | /* Add common DT information about the device */ |
334 | of_device_uevent(dev, env); | |
335 | ||
7eff2e7a | 336 | /* have the bus specific function add its stuff */ |
312c004d | 337 | if (dev->bus && dev->bus->uevent) { |
7eff2e7a | 338 | retval = dev->bus->uevent(dev, env); |
f9f852df | 339 | if (retval) |
7dc72b28 | 340 | pr_debug("device: '%s': %s: bus uevent() returned %d\n", |
1e0b2cf9 | 341 | dev_name(dev), __func__, retval); |
1da177e4 LT |
342 | } |
343 | ||
7eff2e7a | 344 | /* have the class specific function add its stuff */ |
2620efef | 345 | if (dev->class && dev->class->dev_uevent) { |
7eff2e7a | 346 | retval = dev->class->dev_uevent(dev, env); |
f9f852df | 347 | if (retval) |
7dc72b28 | 348 | pr_debug("device: '%s': %s: class uevent() " |
1e0b2cf9 | 349 | "returned %d\n", dev_name(dev), |
2b3a302a | 350 | __func__, retval); |
f9f852df KS |
351 | } |
352 | ||
eef35c2d | 353 | /* have the device type specific function add its stuff */ |
f9f852df | 354 | if (dev->type && dev->type->uevent) { |
7eff2e7a | 355 | retval = dev->type->uevent(dev, env); |
f9f852df | 356 | if (retval) |
7dc72b28 | 357 | pr_debug("device: '%s': %s: dev_type uevent() " |
1e0b2cf9 | 358 | "returned %d\n", dev_name(dev), |
2b3a302a | 359 | __func__, retval); |
2620efef GKH |
360 | } |
361 | ||
1da177e4 LT |
362 | return retval; |
363 | } | |
364 | ||
9cd43611 | 365 | static const struct kset_uevent_ops device_uevent_ops = { |
312c004d KS |
366 | .filter = dev_uevent_filter, |
367 | .name = dev_uevent_name, | |
368 | .uevent = dev_uevent, | |
1da177e4 LT |
369 | }; |
370 | ||
c5e064a6 | 371 | static ssize_t uevent_show(struct device *dev, struct device_attribute *attr, |
16574dcc KS |
372 | char *buf) |
373 | { | |
374 | struct kobject *top_kobj; | |
375 | struct kset *kset; | |
7eff2e7a | 376 | struct kobj_uevent_env *env = NULL; |
16574dcc KS |
377 | int i; |
378 | size_t count = 0; | |
379 | int retval; | |
380 | ||
381 | /* search the kset, the device belongs to */ | |
382 | top_kobj = &dev->kobj; | |
5c5daf65 KS |
383 | while (!top_kobj->kset && top_kobj->parent) |
384 | top_kobj = top_kobj->parent; | |
16574dcc KS |
385 | if (!top_kobj->kset) |
386 | goto out; | |
5c5daf65 | 387 | |
16574dcc KS |
388 | kset = top_kobj->kset; |
389 | if (!kset->uevent_ops || !kset->uevent_ops->uevent) | |
390 | goto out; | |
391 | ||
392 | /* respect filter */ | |
393 | if (kset->uevent_ops && kset->uevent_ops->filter) | |
394 | if (!kset->uevent_ops->filter(kset, &dev->kobj)) | |
395 | goto out; | |
396 | ||
7eff2e7a KS |
397 | env = kzalloc(sizeof(struct kobj_uevent_env), GFP_KERNEL); |
398 | if (!env) | |
c7308c81 GKH |
399 | return -ENOMEM; |
400 | ||
16574dcc | 401 | /* let the kset specific function add its keys */ |
7eff2e7a | 402 | retval = kset->uevent_ops->uevent(kset, &dev->kobj, env); |
16574dcc KS |
403 | if (retval) |
404 | goto out; | |
405 | ||
406 | /* copy keys to file */ | |
7eff2e7a KS |
407 | for (i = 0; i < env->envp_idx; i++) |
408 | count += sprintf(&buf[count], "%s\n", env->envp[i]); | |
16574dcc | 409 | out: |
7eff2e7a | 410 | kfree(env); |
16574dcc KS |
411 | return count; |
412 | } | |
413 | ||
c5e064a6 | 414 | static ssize_t uevent_store(struct device *dev, struct device_attribute *attr, |
a7fd6706 KS |
415 | const char *buf, size_t count) |
416 | { | |
60a96a59 KS |
417 | enum kobject_action action; |
418 | ||
3f5468c9 | 419 | if (kobject_action_type(buf, count, &action) == 0) |
60a96a59 | 420 | kobject_uevent(&dev->kobj, action); |
3f5468c9 KS |
421 | else |
422 | dev_err(dev, "uevent: unknown action-string\n"); | |
a7fd6706 KS |
423 | return count; |
424 | } | |
c5e064a6 | 425 | static DEVICE_ATTR_RW(uevent); |
a7fd6706 | 426 | |
c5e064a6 | 427 | static ssize_t online_show(struct device *dev, struct device_attribute *attr, |
4f3549d7 RW |
428 | char *buf) |
429 | { | |
430 | bool val; | |
431 | ||
5e33bc41 | 432 | device_lock(dev); |
4f3549d7 | 433 | val = !dev->offline; |
5e33bc41 | 434 | device_unlock(dev); |
4f3549d7 RW |
435 | return sprintf(buf, "%u\n", val); |
436 | } | |
437 | ||
c5e064a6 | 438 | static ssize_t online_store(struct device *dev, struct device_attribute *attr, |
4f3549d7 RW |
439 | const char *buf, size_t count) |
440 | { | |
441 | bool val; | |
442 | int ret; | |
443 | ||
444 | ret = strtobool(buf, &val); | |
445 | if (ret < 0) | |
446 | return ret; | |
447 | ||
5e33bc41 RW |
448 | ret = lock_device_hotplug_sysfs(); |
449 | if (ret) | |
450 | return ret; | |
451 | ||
4f3549d7 RW |
452 | ret = val ? device_online(dev) : device_offline(dev); |
453 | unlock_device_hotplug(); | |
454 | return ret < 0 ? ret : count; | |
455 | } | |
c5e064a6 | 456 | static DEVICE_ATTR_RW(online); |
4f3549d7 | 457 | |
621a1672 DT |
458 | static int device_add_attributes(struct device *dev, |
459 | struct device_attribute *attrs) | |
de0ff00d | 460 | { |
621a1672 | 461 | int error = 0; |
de0ff00d | 462 | int i; |
621a1672 DT |
463 | |
464 | if (attrs) { | |
3e1026b3 | 465 | for (i = 0; attrs[i].attr.name; i++) { |
621a1672 DT |
466 | error = device_create_file(dev, &attrs[i]); |
467 | if (error) | |
468 | break; | |
469 | } | |
470 | if (error) | |
471 | while (--i >= 0) | |
472 | device_remove_file(dev, &attrs[i]); | |
473 | } | |
474 | return error; | |
475 | } | |
476 | ||
477 | static void device_remove_attributes(struct device *dev, | |
478 | struct device_attribute *attrs) | |
479 | { | |
480 | int i; | |
481 | ||
482 | if (attrs) | |
3e1026b3 | 483 | for (i = 0; attrs[i].attr.name; i++) |
621a1672 DT |
484 | device_remove_file(dev, &attrs[i]); |
485 | } | |
486 | ||
c97415a7 SA |
487 | static int device_add_bin_attributes(struct device *dev, |
488 | struct bin_attribute *attrs) | |
489 | { | |
490 | int error = 0; | |
491 | int i; | |
492 | ||
493 | if (attrs) { | |
3e1026b3 | 494 | for (i = 0; attrs[i].attr.name; i++) { |
c97415a7 SA |
495 | error = device_create_bin_file(dev, &attrs[i]); |
496 | if (error) | |
497 | break; | |
498 | } | |
499 | if (error) | |
500 | while (--i >= 0) | |
501 | device_remove_bin_file(dev, &attrs[i]); | |
502 | } | |
503 | return error; | |
504 | } | |
505 | ||
506 | static void device_remove_bin_attributes(struct device *dev, | |
507 | struct bin_attribute *attrs) | |
508 | { | |
509 | int i; | |
510 | ||
511 | if (attrs) | |
3e1026b3 | 512 | for (i = 0; attrs[i].attr.name; i++) |
c97415a7 SA |
513 | device_remove_bin_file(dev, &attrs[i]); |
514 | } | |
515 | ||
fa6fdb33 | 516 | int device_add_groups(struct device *dev, const struct attribute_group **groups) |
621a1672 | 517 | { |
3e9b2bae | 518 | return sysfs_create_groups(&dev->kobj, groups); |
de0ff00d GKH |
519 | } |
520 | ||
fa6fdb33 GKH |
521 | void device_remove_groups(struct device *dev, |
522 | const struct attribute_group **groups) | |
de0ff00d | 523 | { |
3e9b2bae | 524 | sysfs_remove_groups(&dev->kobj, groups); |
de0ff00d GKH |
525 | } |
526 | ||
2620efef GKH |
527 | static int device_add_attrs(struct device *dev) |
528 | { | |
529 | struct class *class = dev->class; | |
aed65af1 | 530 | const struct device_type *type = dev->type; |
621a1672 | 531 | int error; |
2620efef | 532 | |
621a1672 | 533 | if (class) { |
d05a6f96 | 534 | error = device_add_groups(dev, class->dev_groups); |
f9f852df | 535 | if (error) |
621a1672 | 536 | return error; |
d05a6f96 GKH |
537 | error = device_add_attributes(dev, class->dev_attrs); |
538 | if (error) | |
539 | goto err_remove_class_groups; | |
c97415a7 SA |
540 | error = device_add_bin_attributes(dev, class->dev_bin_attrs); |
541 | if (error) | |
542 | goto err_remove_class_attrs; | |
2620efef | 543 | } |
f9f852df | 544 | |
621a1672 DT |
545 | if (type) { |
546 | error = device_add_groups(dev, type->groups); | |
f9f852df | 547 | if (error) |
c97415a7 | 548 | goto err_remove_class_bin_attrs; |
f9f852df KS |
549 | } |
550 | ||
621a1672 DT |
551 | error = device_add_groups(dev, dev->groups); |
552 | if (error) | |
553 | goto err_remove_type_groups; | |
554 | ||
4f3549d7 | 555 | if (device_supports_offline(dev) && !dev->offline_disabled) { |
c5e064a6 | 556 | error = device_create_file(dev, &dev_attr_online); |
4f3549d7 RW |
557 | if (error) |
558 | goto err_remove_type_groups; | |
559 | } | |
560 | ||
621a1672 DT |
561 | return 0; |
562 | ||
563 | err_remove_type_groups: | |
564 | if (type) | |
565 | device_remove_groups(dev, type->groups); | |
c97415a7 SA |
566 | err_remove_class_bin_attrs: |
567 | if (class) | |
568 | device_remove_bin_attributes(dev, class->dev_bin_attrs); | |
621a1672 DT |
569 | err_remove_class_attrs: |
570 | if (class) | |
571 | device_remove_attributes(dev, class->dev_attrs); | |
d05a6f96 GKH |
572 | err_remove_class_groups: |
573 | if (class) | |
574 | device_remove_groups(dev, class->dev_groups); | |
621a1672 | 575 | |
2620efef GKH |
576 | return error; |
577 | } | |
578 | ||
579 | static void device_remove_attrs(struct device *dev) | |
580 | { | |
581 | struct class *class = dev->class; | |
aed65af1 | 582 | const struct device_type *type = dev->type; |
2620efef | 583 | |
c5e064a6 | 584 | device_remove_file(dev, &dev_attr_online); |
621a1672 | 585 | device_remove_groups(dev, dev->groups); |
f9f852df | 586 | |
621a1672 DT |
587 | if (type) |
588 | device_remove_groups(dev, type->groups); | |
589 | ||
c97415a7 | 590 | if (class) { |
621a1672 | 591 | device_remove_attributes(dev, class->dev_attrs); |
c97415a7 | 592 | device_remove_bin_attributes(dev, class->dev_bin_attrs); |
d05a6f96 | 593 | device_remove_groups(dev, class->dev_groups); |
c97415a7 | 594 | } |
2620efef GKH |
595 | } |
596 | ||
c5e064a6 | 597 | static ssize_t dev_show(struct device *dev, struct device_attribute *attr, |
23681e47 GKH |
598 | char *buf) |
599 | { | |
600 | return print_dev_t(buf, dev->devt); | |
601 | } | |
c5e064a6 | 602 | static DEVICE_ATTR_RO(dev); |
ad6a1e1c | 603 | |
ca22e56d | 604 | /* /sys/devices/ */ |
881c6cfd | 605 | struct kset *devices_kset; |
1da177e4 | 606 | |
1da177e4 | 607 | /** |
4a3ad20c GKH |
608 | * device_create_file - create sysfs attribute file for device. |
609 | * @dev: device. | |
610 | * @attr: device attribute descriptor. | |
1da177e4 | 611 | */ |
26579ab7 PC |
612 | int device_create_file(struct device *dev, |
613 | const struct device_attribute *attr) | |
1da177e4 LT |
614 | { |
615 | int error = 0; | |
8f46baaa FB |
616 | |
617 | if (dev) { | |
618 | WARN(((attr->attr.mode & S_IWUGO) && !attr->store), | |
97521978 | 619 | "Attribute %s: write permission without 'store'\n", |
620 | attr->attr.name); | |
8f46baaa | 621 | WARN(((attr->attr.mode & S_IRUGO) && !attr->show), |
97521978 | 622 | "Attribute %s: read permission without 'show'\n", |
623 | attr->attr.name); | |
1da177e4 | 624 | error = sysfs_create_file(&dev->kobj, &attr->attr); |
8f46baaa FB |
625 | } |
626 | ||
1da177e4 LT |
627 | return error; |
628 | } | |
86df2687 | 629 | EXPORT_SYMBOL_GPL(device_create_file); |
1da177e4 LT |
630 | |
631 | /** | |
4a3ad20c GKH |
632 | * device_remove_file - remove sysfs attribute file. |
633 | * @dev: device. | |
634 | * @attr: device attribute descriptor. | |
1da177e4 | 635 | */ |
26579ab7 PC |
636 | void device_remove_file(struct device *dev, |
637 | const struct device_attribute *attr) | |
1da177e4 | 638 | { |
0c98b19f | 639 | if (dev) |
1da177e4 | 640 | sysfs_remove_file(&dev->kobj, &attr->attr); |
1da177e4 | 641 | } |
86df2687 | 642 | EXPORT_SYMBOL_GPL(device_remove_file); |
1da177e4 | 643 | |
2589f188 GKH |
644 | /** |
645 | * device_create_bin_file - create sysfs binary attribute file for device. | |
646 | * @dev: device. | |
647 | * @attr: device binary attribute descriptor. | |
648 | */ | |
66ecb92b PC |
649 | int device_create_bin_file(struct device *dev, |
650 | const struct bin_attribute *attr) | |
2589f188 GKH |
651 | { |
652 | int error = -EINVAL; | |
653 | if (dev) | |
654 | error = sysfs_create_bin_file(&dev->kobj, attr); | |
655 | return error; | |
656 | } | |
657 | EXPORT_SYMBOL_GPL(device_create_bin_file); | |
658 | ||
659 | /** | |
660 | * device_remove_bin_file - remove sysfs binary attribute file | |
661 | * @dev: device. | |
662 | * @attr: device binary attribute descriptor. | |
663 | */ | |
66ecb92b PC |
664 | void device_remove_bin_file(struct device *dev, |
665 | const struct bin_attribute *attr) | |
2589f188 GKH |
666 | { |
667 | if (dev) | |
668 | sysfs_remove_bin_file(&dev->kobj, attr); | |
669 | } | |
670 | EXPORT_SYMBOL_GPL(device_remove_bin_file); | |
671 | ||
d9a9cdfb | 672 | /** |
523ded71 | 673 | * device_schedule_callback_owner - helper to schedule a callback for a device |
d9a9cdfb AS |
674 | * @dev: device. |
675 | * @func: callback function to invoke later. | |
523ded71 | 676 | * @owner: module owning the callback routine |
d9a9cdfb AS |
677 | * |
678 | * Attribute methods must not unregister themselves or their parent device | |
679 | * (which would amount to the same thing). Attempts to do so will deadlock, | |
680 | * since unregistration is mutually exclusive with driver callbacks. | |
681 | * | |
682 | * Instead methods can call this routine, which will attempt to allocate | |
683 | * and schedule a workqueue request to call back @func with @dev as its | |
684 | * argument in the workqueue's process context. @dev will be pinned until | |
685 | * @func returns. | |
686 | * | |
523ded71 AS |
687 | * This routine is usually called via the inline device_schedule_callback(), |
688 | * which automatically sets @owner to THIS_MODULE. | |
689 | * | |
d9a9cdfb | 690 | * Returns 0 if the request was submitted, -ENOMEM if storage could not |
523ded71 | 691 | * be allocated, -ENODEV if a reference to @owner isn't available. |
d9a9cdfb AS |
692 | * |
693 | * NOTE: This routine won't work if CONFIG_SYSFS isn't set! It uses an | |
694 | * underlying sysfs routine (since it is intended for use by attribute | |
695 | * methods), and if sysfs isn't available you'll get nothing but -ENOSYS. | |
696 | */ | |
523ded71 AS |
697 | int device_schedule_callback_owner(struct device *dev, |
698 | void (*func)(struct device *), struct module *owner) | |
d9a9cdfb AS |
699 | { |
700 | return sysfs_schedule_callback(&dev->kobj, | |
523ded71 | 701 | (void (*)(void *)) func, dev, owner); |
d9a9cdfb | 702 | } |
523ded71 | 703 | EXPORT_SYMBOL_GPL(device_schedule_callback_owner); |
d9a9cdfb | 704 | |
34bb61f9 JB |
705 | static void klist_children_get(struct klist_node *n) |
706 | { | |
f791b8c8 GKH |
707 | struct device_private *p = to_device_private_parent(n); |
708 | struct device *dev = p->device; | |
34bb61f9 JB |
709 | |
710 | get_device(dev); | |
711 | } | |
712 | ||
713 | static void klist_children_put(struct klist_node *n) | |
714 | { | |
f791b8c8 GKH |
715 | struct device_private *p = to_device_private_parent(n); |
716 | struct device *dev = p->device; | |
34bb61f9 JB |
717 | |
718 | put_device(dev); | |
719 | } | |
720 | ||
1da177e4 | 721 | /** |
4a3ad20c GKH |
722 | * device_initialize - init device structure. |
723 | * @dev: device. | |
1da177e4 | 724 | * |
5739411a CH |
725 | * This prepares the device for use by other layers by initializing |
726 | * its fields. | |
4a3ad20c | 727 | * It is the first half of device_register(), if called by |
5739411a CH |
728 | * that function, though it can also be called separately, so one |
729 | * may use @dev's fields. In particular, get_device()/put_device() | |
730 | * may be used for reference counting of @dev after calling this | |
731 | * function. | |
732 | * | |
b10d5efd AS |
733 | * All fields in @dev must be initialized by the caller to 0, except |
734 | * for those explicitly set to some other value. The simplest | |
735 | * approach is to use kzalloc() to allocate the structure containing | |
736 | * @dev. | |
737 | * | |
5739411a CH |
738 | * NOTE: Use put_device() to give up your reference instead of freeing |
739 | * @dev directly once you have called this function. | |
1da177e4 | 740 | */ |
1da177e4 LT |
741 | void device_initialize(struct device *dev) |
742 | { | |
881c6cfd | 743 | dev->kobj.kset = devices_kset; |
f9cb074b | 744 | kobject_init(&dev->kobj, &device_ktype); |
1da177e4 | 745 | INIT_LIST_HEAD(&dev->dma_pools); |
3142788b | 746 | mutex_init(&dev->mutex); |
1704f47b | 747 | lockdep_set_novalidate_class(&dev->mutex); |
9ac7849e TH |
748 | spin_lock_init(&dev->devres_lock); |
749 | INIT_LIST_HEAD(&dev->devres_head); | |
3b98aeaf | 750 | device_pm_init(dev); |
87348136 | 751 | set_dev_node(dev, -1); |
1da177e4 | 752 | } |
86df2687 | 753 | EXPORT_SYMBOL_GPL(device_initialize); |
1da177e4 | 754 | |
d73ce004 | 755 | struct kobject *virtual_device_parent(struct device *dev) |
f0ee61a6 | 756 | { |
86406245 | 757 | static struct kobject *virtual_dir = NULL; |
f0ee61a6 | 758 | |
86406245 | 759 | if (!virtual_dir) |
4ff6abff | 760 | virtual_dir = kobject_create_and_add("virtual", |
881c6cfd | 761 | &devices_kset->kobj); |
f0ee61a6 | 762 | |
86406245 | 763 | return virtual_dir; |
f0ee61a6 GKH |
764 | } |
765 | ||
bc451f20 EB |
766 | struct class_dir { |
767 | struct kobject kobj; | |
768 | struct class *class; | |
769 | }; | |
770 | ||
771 | #define to_class_dir(obj) container_of(obj, struct class_dir, kobj) | |
772 | ||
773 | static void class_dir_release(struct kobject *kobj) | |
774 | { | |
775 | struct class_dir *dir = to_class_dir(kobj); | |
776 | kfree(dir); | |
777 | } | |
778 | ||
779 | static const | |
780 | struct kobj_ns_type_operations *class_dir_child_ns_type(struct kobject *kobj) | |
40fa5422 | 781 | { |
bc451f20 EB |
782 | struct class_dir *dir = to_class_dir(kobj); |
783 | return dir->class->ns_type; | |
784 | } | |
785 | ||
786 | static struct kobj_type class_dir_ktype = { | |
787 | .release = class_dir_release, | |
788 | .sysfs_ops = &kobj_sysfs_ops, | |
789 | .child_ns_type = class_dir_child_ns_type | |
790 | }; | |
791 | ||
792 | static struct kobject * | |
793 | class_dir_create_and_add(struct class *class, struct kobject *parent_kobj) | |
794 | { | |
795 | struct class_dir *dir; | |
43968d2f GKH |
796 | int retval; |
797 | ||
bc451f20 EB |
798 | dir = kzalloc(sizeof(*dir), GFP_KERNEL); |
799 | if (!dir) | |
800 | return NULL; | |
801 | ||
802 | dir->class = class; | |
803 | kobject_init(&dir->kobj, &class_dir_ktype); | |
804 | ||
6b6e39a6 | 805 | dir->kobj.kset = &class->p->glue_dirs; |
bc451f20 EB |
806 | |
807 | retval = kobject_add(&dir->kobj, parent_kobj, "%s", class->name); | |
808 | if (retval < 0) { | |
809 | kobject_put(&dir->kobj); | |
810 | return NULL; | |
811 | } | |
812 | return &dir->kobj; | |
813 | } | |
814 | ||
815 | ||
816 | static struct kobject *get_device_parent(struct device *dev, | |
817 | struct device *parent) | |
818 | { | |
86406245 | 819 | if (dev->class) { |
77d3d7c1 | 820 | static DEFINE_MUTEX(gdp_mutex); |
86406245 KS |
821 | struct kobject *kobj = NULL; |
822 | struct kobject *parent_kobj; | |
823 | struct kobject *k; | |
824 | ||
ead454fe | 825 | #ifdef CONFIG_BLOCK |
39aba963 | 826 | /* block disks show up in /sys/block */ |
e52eec13 | 827 | if (sysfs_deprecated && dev->class == &block_class) { |
39aba963 KS |
828 | if (parent && parent->class == &block_class) |
829 | return &parent->kobj; | |
6b6e39a6 | 830 | return &block_class.p->subsys.kobj; |
39aba963 | 831 | } |
ead454fe | 832 | #endif |
e52eec13 | 833 | |
86406245 KS |
834 | /* |
835 | * If we have no parent, we live in "virtual". | |
0f4dafc0 KS |
836 | * Class-devices with a non class-device as parent, live |
837 | * in a "glue" directory to prevent namespace collisions. | |
86406245 KS |
838 | */ |
839 | if (parent == NULL) | |
840 | parent_kobj = virtual_device_parent(dev); | |
24b1442d | 841 | else if (parent->class && !dev->class->ns_type) |
86406245 KS |
842 | return &parent->kobj; |
843 | else | |
844 | parent_kobj = &parent->kobj; | |
845 | ||
77d3d7c1 TH |
846 | mutex_lock(&gdp_mutex); |
847 | ||
86406245 | 848 | /* find our class-directory at the parent and reference it */ |
6b6e39a6 KS |
849 | spin_lock(&dev->class->p->glue_dirs.list_lock); |
850 | list_for_each_entry(k, &dev->class->p->glue_dirs.list, entry) | |
86406245 KS |
851 | if (k->parent == parent_kobj) { |
852 | kobj = kobject_get(k); | |
853 | break; | |
854 | } | |
6b6e39a6 | 855 | spin_unlock(&dev->class->p->glue_dirs.list_lock); |
77d3d7c1 TH |
856 | if (kobj) { |
857 | mutex_unlock(&gdp_mutex); | |
86406245 | 858 | return kobj; |
77d3d7c1 | 859 | } |
86406245 KS |
860 | |
861 | /* or create a new class-directory at the parent device */ | |
bc451f20 | 862 | k = class_dir_create_and_add(dev->class, parent_kobj); |
0f4dafc0 | 863 | /* do not emit an uevent for this simple "glue" directory */ |
77d3d7c1 | 864 | mutex_unlock(&gdp_mutex); |
43968d2f | 865 | return k; |
86406245 KS |
866 | } |
867 | ||
ca22e56d KS |
868 | /* subsystems can specify a default root directory for their devices */ |
869 | if (!parent && dev->bus && dev->bus->dev_root) | |
870 | return &dev->bus->dev_root->kobj; | |
871 | ||
86406245 | 872 | if (parent) |
c744aeae CH |
873 | return &parent->kobj; |
874 | return NULL; | |
875 | } | |
da231fd5 | 876 | |
63b6971a | 877 | static void cleanup_glue_dir(struct device *dev, struct kobject *glue_dir) |
da231fd5 | 878 | { |
0f4dafc0 | 879 | /* see if we live in a "glue" directory */ |
c1fe539a | 880 | if (!glue_dir || !dev->class || |
6b6e39a6 | 881 | glue_dir->kset != &dev->class->p->glue_dirs) |
da231fd5 KS |
882 | return; |
883 | ||
0f4dafc0 | 884 | kobject_put(glue_dir); |
da231fd5 | 885 | } |
63b6971a CH |
886 | |
887 | static void cleanup_device_parent(struct device *dev) | |
888 | { | |
889 | cleanup_glue_dir(dev, dev->kobj.parent); | |
890 | } | |
86406245 | 891 | |
2ee97caf CH |
892 | static int device_add_class_symlinks(struct device *dev) |
893 | { | |
894 | int error; | |
895 | ||
896 | if (!dev->class) | |
897 | return 0; | |
da231fd5 | 898 | |
1fbfee6c | 899 | error = sysfs_create_link(&dev->kobj, |
6b6e39a6 | 900 | &dev->class->p->subsys.kobj, |
2ee97caf CH |
901 | "subsystem"); |
902 | if (error) | |
903 | goto out; | |
da231fd5 | 904 | |
4e886c29 | 905 | if (dev->parent && device_is_not_partition(dev)) { |
39aba963 | 906 | error = sysfs_create_link(&dev->kobj, &dev->parent->kobj, |
4f01a757 DT |
907 | "device"); |
908 | if (error) | |
39aba963 | 909 | goto out_subsys; |
2ee97caf | 910 | } |
2ee97caf | 911 | |
ead454fe | 912 | #ifdef CONFIG_BLOCK |
39aba963 | 913 | /* /sys/block has directories and does not need symlinks */ |
e52eec13 | 914 | if (sysfs_deprecated && dev->class == &block_class) |
39aba963 | 915 | return 0; |
ead454fe | 916 | #endif |
39aba963 | 917 | |
da231fd5 | 918 | /* link in the class directory pointing to the device */ |
6b6e39a6 | 919 | error = sysfs_create_link(&dev->class->p->subsys.kobj, |
1e0b2cf9 | 920 | &dev->kobj, dev_name(dev)); |
da231fd5 | 921 | if (error) |
39aba963 | 922 | goto out_device; |
da231fd5 | 923 | |
da231fd5 KS |
924 | return 0; |
925 | ||
39aba963 KS |
926 | out_device: |
927 | sysfs_remove_link(&dev->kobj, "device"); | |
da231fd5 | 928 | |
2ee97caf CH |
929 | out_subsys: |
930 | sysfs_remove_link(&dev->kobj, "subsystem"); | |
931 | out: | |
932 | return error; | |
933 | } | |
934 | ||
935 | static void device_remove_class_symlinks(struct device *dev) | |
936 | { | |
937 | if (!dev->class) | |
938 | return; | |
da231fd5 | 939 | |
4e886c29 | 940 | if (dev->parent && device_is_not_partition(dev)) |
da231fd5 | 941 | sysfs_remove_link(&dev->kobj, "device"); |
2ee97caf | 942 | sysfs_remove_link(&dev->kobj, "subsystem"); |
ead454fe | 943 | #ifdef CONFIG_BLOCK |
e52eec13 | 944 | if (sysfs_deprecated && dev->class == &block_class) |
39aba963 | 945 | return; |
ead454fe | 946 | #endif |
6b6e39a6 | 947 | sysfs_delete_link(&dev->class->p->subsys.kobj, &dev->kobj, dev_name(dev)); |
2ee97caf CH |
948 | } |
949 | ||
413c239f SR |
950 | /** |
951 | * dev_set_name - set a device name | |
952 | * @dev: device | |
46232366 | 953 | * @fmt: format string for the device's name |
413c239f SR |
954 | */ |
955 | int dev_set_name(struct device *dev, const char *fmt, ...) | |
956 | { | |
957 | va_list vargs; | |
1fa5ae85 | 958 | int err; |
413c239f SR |
959 | |
960 | va_start(vargs, fmt); | |
1fa5ae85 | 961 | err = kobject_set_name_vargs(&dev->kobj, fmt, vargs); |
413c239f | 962 | va_end(vargs); |
1fa5ae85 | 963 | return err; |
413c239f SR |
964 | } |
965 | EXPORT_SYMBOL_GPL(dev_set_name); | |
966 | ||
e105b8bf DW |
967 | /** |
968 | * device_to_dev_kobj - select a /sys/dev/ directory for the device | |
969 | * @dev: device | |
970 | * | |
971 | * By default we select char/ for new entries. Setting class->dev_obj | |
972 | * to NULL prevents an entry from being created. class->dev_kobj must | |
973 | * be set (or cleared) before any devices are registered to the class | |
974 | * otherwise device_create_sys_dev_entry() and | |
0d4e293c PK |
975 | * device_remove_sys_dev_entry() will disagree about the presence of |
976 | * the link. | |
e105b8bf DW |
977 | */ |
978 | static struct kobject *device_to_dev_kobj(struct device *dev) | |
979 | { | |
980 | struct kobject *kobj; | |
981 | ||
982 | if (dev->class) | |
983 | kobj = dev->class->dev_kobj; | |
984 | else | |
985 | kobj = sysfs_dev_char_kobj; | |
986 | ||
987 | return kobj; | |
988 | } | |
989 | ||
990 | static int device_create_sys_dev_entry(struct device *dev) | |
991 | { | |
992 | struct kobject *kobj = device_to_dev_kobj(dev); | |
993 | int error = 0; | |
994 | char devt_str[15]; | |
995 | ||
996 | if (kobj) { | |
997 | format_dev_t(devt_str, dev->devt); | |
998 | error = sysfs_create_link(kobj, &dev->kobj, devt_str); | |
999 | } | |
1000 | ||
1001 | return error; | |
1002 | } | |
1003 | ||
1004 | static void device_remove_sys_dev_entry(struct device *dev) | |
1005 | { | |
1006 | struct kobject *kobj = device_to_dev_kobj(dev); | |
1007 | char devt_str[15]; | |
1008 | ||
1009 | if (kobj) { | |
1010 | format_dev_t(devt_str, dev->devt); | |
1011 | sysfs_remove_link(kobj, devt_str); | |
1012 | } | |
1013 | } | |
1014 | ||
b4028437 GKH |
1015 | int device_private_init(struct device *dev) |
1016 | { | |
1017 | dev->p = kzalloc(sizeof(*dev->p), GFP_KERNEL); | |
1018 | if (!dev->p) | |
1019 | return -ENOMEM; | |
1020 | dev->p->device = dev; | |
1021 | klist_init(&dev->p->klist_children, klist_children_get, | |
1022 | klist_children_put); | |
ef8a3fd6 | 1023 | INIT_LIST_HEAD(&dev->p->deferred_probe); |
b4028437 GKH |
1024 | return 0; |
1025 | } | |
1026 | ||
1da177e4 | 1027 | /** |
4a3ad20c GKH |
1028 | * device_add - add device to device hierarchy. |
1029 | * @dev: device. | |
1da177e4 | 1030 | * |
4a3ad20c GKH |
1031 | * This is part 2 of device_register(), though may be called |
1032 | * separately _iff_ device_initialize() has been called separately. | |
1da177e4 | 1033 | * |
5739411a | 1034 | * This adds @dev to the kobject hierarchy via kobject_add(), adds it |
4a3ad20c GKH |
1035 | * to the global and sibling lists for the device, then |
1036 | * adds it to the other relevant subsystems of the driver model. | |
5739411a | 1037 | * |
b10d5efd AS |
1038 | * Do not call this routine or device_register() more than once for |
1039 | * any device structure. The driver model core is not designed to work | |
1040 | * with devices that get unregistered and then spring back to life. | |
1041 | * (Among other things, it's very hard to guarantee that all references | |
1042 | * to the previous incarnation of @dev have been dropped.) Allocate | |
1043 | * and register a fresh new struct device instead. | |
1044 | * | |
5739411a CH |
1045 | * NOTE: _Never_ directly free @dev after calling this function, even |
1046 | * if it returned an error! Always use put_device() to give up your | |
1047 | * reference instead. | |
1da177e4 LT |
1048 | */ |
1049 | int device_add(struct device *dev) | |
1050 | { | |
1051 | struct device *parent = NULL; | |
ca22e56d | 1052 | struct kobject *kobj; |
c47ed219 | 1053 | struct class_interface *class_intf; |
c906a48a | 1054 | int error = -EINVAL; |
775b64d2 | 1055 | |
1da177e4 | 1056 | dev = get_device(dev); |
c906a48a GKH |
1057 | if (!dev) |
1058 | goto done; | |
1059 | ||
fb069a5d | 1060 | if (!dev->p) { |
b4028437 GKH |
1061 | error = device_private_init(dev); |
1062 | if (error) | |
1063 | goto done; | |
fb069a5d | 1064 | } |
fb069a5d | 1065 | |
1fa5ae85 KS |
1066 | /* |
1067 | * for statically allocated devices, which should all be converted | |
1068 | * some day, we need to initialize the name. We prevent reading back | |
1069 | * the name, and force the use of dev_name() | |
1070 | */ | |
1071 | if (dev->init_name) { | |
acc0e90f | 1072 | dev_set_name(dev, "%s", dev->init_name); |
1fa5ae85 KS |
1073 | dev->init_name = NULL; |
1074 | } | |
c906a48a | 1075 | |
ca22e56d KS |
1076 | /* subsystems can specify simple device enumeration */ |
1077 | if (!dev_name(dev) && dev->bus && dev->bus->dev_name) | |
1078 | dev_set_name(dev, "%s%u", dev->bus->dev_name, dev->id); | |
1079 | ||
e6309e75 TG |
1080 | if (!dev_name(dev)) { |
1081 | error = -EINVAL; | |
5c8563d7 | 1082 | goto name_error; |
e6309e75 | 1083 | } |
1da177e4 | 1084 | |
1e0b2cf9 | 1085 | pr_debug("device: '%s': %s\n", dev_name(dev), __func__); |
c205ef48 | 1086 | |
1da177e4 | 1087 | parent = get_device(dev->parent); |
ca22e56d KS |
1088 | kobj = get_device_parent(dev, parent); |
1089 | if (kobj) | |
1090 | dev->kobj.parent = kobj; | |
1da177e4 | 1091 | |
0d358f22 YL |
1092 | /* use parent numa_node */ |
1093 | if (parent) | |
1094 | set_dev_node(dev, dev_to_node(parent)); | |
1095 | ||
1da177e4 | 1096 | /* first, register with generic layer. */ |
8a577ffc KS |
1097 | /* we require the name to be set before, and pass NULL */ |
1098 | error = kobject_add(&dev->kobj, dev->kobj.parent, NULL); | |
40fa5422 | 1099 | if (error) |
1da177e4 | 1100 | goto Error; |
a7fd6706 | 1101 | |
37022644 BW |
1102 | /* notify platform of device entry */ |
1103 | if (platform_notify) | |
1104 | platform_notify(dev); | |
1105 | ||
c5e064a6 | 1106 | error = device_create_file(dev, &dev_attr_uevent); |
a306eea4 CH |
1107 | if (error) |
1108 | goto attrError; | |
a7fd6706 | 1109 | |
23681e47 | 1110 | if (MAJOR(dev->devt)) { |
c5e064a6 | 1111 | error = device_create_file(dev, &dev_attr_dev); |
ad6a1e1c | 1112 | if (error) |
a306eea4 | 1113 | goto ueventattrError; |
e105b8bf DW |
1114 | |
1115 | error = device_create_sys_dev_entry(dev); | |
1116 | if (error) | |
1117 | goto devtattrError; | |
2b2af54a KS |
1118 | |
1119 | devtmpfs_create_node(dev); | |
23681e47 GKH |
1120 | } |
1121 | ||
2ee97caf CH |
1122 | error = device_add_class_symlinks(dev); |
1123 | if (error) | |
1124 | goto SymlinkError; | |
dc0afa83 CH |
1125 | error = device_add_attrs(dev); |
1126 | if (error) | |
2620efef | 1127 | goto AttrsError; |
dc0afa83 CH |
1128 | error = bus_add_device(dev); |
1129 | if (error) | |
1da177e4 | 1130 | goto BusError; |
3b98aeaf | 1131 | error = dpm_sysfs_add(dev); |
57eee3d2 | 1132 | if (error) |
3b98aeaf AS |
1133 | goto DPMError; |
1134 | device_pm_add(dev); | |
ec0676ee AS |
1135 | |
1136 | /* Notify clients of device addition. This call must come | |
268863f4 | 1137 | * after dpm_sysfs_add() and before kobject_uevent(). |
ec0676ee AS |
1138 | */ |
1139 | if (dev->bus) | |
1140 | blocking_notifier_call_chain(&dev->bus->p->bus_notifier, | |
1141 | BUS_NOTIFY_ADD_DEVICE, dev); | |
1142 | ||
83b5fb4c | 1143 | kobject_uevent(&dev->kobj, KOBJ_ADD); |
2023c610 | 1144 | bus_probe_device(dev); |
1da177e4 | 1145 | if (parent) |
f791b8c8 GKH |
1146 | klist_add_tail(&dev->p->knode_parent, |
1147 | &parent->p->klist_children); | |
1da177e4 | 1148 | |
5d9fd169 | 1149 | if (dev->class) { |
ca22e56d | 1150 | mutex_lock(&dev->class->p->mutex); |
c47ed219 | 1151 | /* tie the class to the device */ |
5a3ceb86 | 1152 | klist_add_tail(&dev->knode_class, |
6b6e39a6 | 1153 | &dev->class->p->klist_devices); |
c47ed219 GKH |
1154 | |
1155 | /* notify any interfaces that the device is here */ | |
184f1f77 | 1156 | list_for_each_entry(class_intf, |
ca22e56d | 1157 | &dev->class->p->interfaces, node) |
c47ed219 GKH |
1158 | if (class_intf->add_dev) |
1159 | class_intf->add_dev(dev, class_intf); | |
ca22e56d | 1160 | mutex_unlock(&dev->class->p->mutex); |
5d9fd169 | 1161 | } |
c906a48a | 1162 | done: |
1da177e4 LT |
1163 | put_device(dev); |
1164 | return error; | |
3b98aeaf | 1165 | DPMError: |
57eee3d2 RW |
1166 | bus_remove_device(dev); |
1167 | BusError: | |
82f0cf9b | 1168 | device_remove_attrs(dev); |
2620efef | 1169 | AttrsError: |
2ee97caf CH |
1170 | device_remove_class_symlinks(dev); |
1171 | SymlinkError: | |
ad72956d KS |
1172 | if (MAJOR(dev->devt)) |
1173 | devtmpfs_delete_node(dev); | |
e105b8bf DW |
1174 | if (MAJOR(dev->devt)) |
1175 | device_remove_sys_dev_entry(dev); | |
1176 | devtattrError: | |
ad6a1e1c | 1177 | if (MAJOR(dev->devt)) |
c5e064a6 | 1178 | device_remove_file(dev, &dev_attr_dev); |
a306eea4 | 1179 | ueventattrError: |
c5e064a6 | 1180 | device_remove_file(dev, &dev_attr_uevent); |
23681e47 | 1181 | attrError: |
312c004d | 1182 | kobject_uevent(&dev->kobj, KOBJ_REMOVE); |
1da177e4 LT |
1183 | kobject_del(&dev->kobj); |
1184 | Error: | |
63b6971a | 1185 | cleanup_device_parent(dev); |
1da177e4 LT |
1186 | if (parent) |
1187 | put_device(parent); | |
5c8563d7 KS |
1188 | name_error: |
1189 | kfree(dev->p); | |
1190 | dev->p = NULL; | |
c906a48a | 1191 | goto done; |
1da177e4 | 1192 | } |
86df2687 | 1193 | EXPORT_SYMBOL_GPL(device_add); |
1da177e4 | 1194 | |
1da177e4 | 1195 | /** |
4a3ad20c GKH |
1196 | * device_register - register a device with the system. |
1197 | * @dev: pointer to the device structure | |
1da177e4 | 1198 | * |
4a3ad20c GKH |
1199 | * This happens in two clean steps - initialize the device |
1200 | * and add it to the system. The two steps can be called | |
1201 | * separately, but this is the easiest and most common. | |
1202 | * I.e. you should only call the two helpers separately if | |
1203 | * have a clearly defined need to use and refcount the device | |
1204 | * before it is added to the hierarchy. | |
5739411a | 1205 | * |
b10d5efd AS |
1206 | * For more information, see the kerneldoc for device_initialize() |
1207 | * and device_add(). | |
1208 | * | |
5739411a CH |
1209 | * NOTE: _Never_ directly free @dev after calling this function, even |
1210 | * if it returned an error! Always use put_device() to give up the | |
1211 | * reference initialized in this function instead. | |
1da177e4 | 1212 | */ |
1da177e4 LT |
1213 | int device_register(struct device *dev) |
1214 | { | |
1215 | device_initialize(dev); | |
1216 | return device_add(dev); | |
1217 | } | |
86df2687 | 1218 | EXPORT_SYMBOL_GPL(device_register); |
1da177e4 | 1219 | |
1da177e4 | 1220 | /** |
4a3ad20c GKH |
1221 | * get_device - increment reference count for device. |
1222 | * @dev: device. | |
1da177e4 | 1223 | * |
4a3ad20c GKH |
1224 | * This simply forwards the call to kobject_get(), though |
1225 | * we do take care to provide for the case that we get a NULL | |
1226 | * pointer passed in. | |
1da177e4 | 1227 | */ |
4a3ad20c | 1228 | struct device *get_device(struct device *dev) |
1da177e4 | 1229 | { |
b0d1f807 | 1230 | return dev ? kobj_to_dev(kobject_get(&dev->kobj)) : NULL; |
1da177e4 | 1231 | } |
86df2687 | 1232 | EXPORT_SYMBOL_GPL(get_device); |
1da177e4 | 1233 | |
1da177e4 | 1234 | /** |
4a3ad20c GKH |
1235 | * put_device - decrement reference count. |
1236 | * @dev: device in question. | |
1da177e4 | 1237 | */ |
4a3ad20c | 1238 | void put_device(struct device *dev) |
1da177e4 | 1239 | { |
edfaa7c3 | 1240 | /* might_sleep(); */ |
1da177e4 LT |
1241 | if (dev) |
1242 | kobject_put(&dev->kobj); | |
1243 | } | |
86df2687 | 1244 | EXPORT_SYMBOL_GPL(put_device); |
1da177e4 | 1245 | |
1da177e4 | 1246 | /** |
4a3ad20c GKH |
1247 | * device_del - delete device from system. |
1248 | * @dev: device. | |
1da177e4 | 1249 | * |
4a3ad20c GKH |
1250 | * This is the first part of the device unregistration |
1251 | * sequence. This removes the device from the lists we control | |
1252 | * from here, has it removed from the other driver model | |
1253 | * subsystems it was added to in device_add(), and removes it | |
1254 | * from the kobject hierarchy. | |
1da177e4 | 1255 | * |
4a3ad20c GKH |
1256 | * NOTE: this should be called manually _iff_ device_add() was |
1257 | * also called manually. | |
1da177e4 | 1258 | */ |
4a3ad20c | 1259 | void device_del(struct device *dev) |
1da177e4 | 1260 | { |
4a3ad20c | 1261 | struct device *parent = dev->parent; |
c47ed219 | 1262 | struct class_interface *class_intf; |
1da177e4 | 1263 | |
ec0676ee AS |
1264 | /* Notify clients of device removal. This call must come |
1265 | * before dpm_sysfs_remove(). | |
1266 | */ | |
1267 | if (dev->bus) | |
1268 | blocking_notifier_call_chain(&dev->bus->p->bus_notifier, | |
1269 | BUS_NOTIFY_DEL_DEVICE, dev); | |
3b98aeaf | 1270 | dpm_sysfs_remove(dev); |
1da177e4 | 1271 | if (parent) |
f791b8c8 | 1272 | klist_del(&dev->p->knode_parent); |
e105b8bf | 1273 | if (MAJOR(dev->devt)) { |
2b2af54a | 1274 | devtmpfs_delete_node(dev); |
e105b8bf | 1275 | device_remove_sys_dev_entry(dev); |
c5e064a6 | 1276 | device_remove_file(dev, &dev_attr_dev); |
e105b8bf | 1277 | } |
b9d9c82b | 1278 | if (dev->class) { |
da231fd5 | 1279 | device_remove_class_symlinks(dev); |
99ef3ef8 | 1280 | |
ca22e56d | 1281 | mutex_lock(&dev->class->p->mutex); |
c47ed219 | 1282 | /* notify any interfaces that the device is now gone */ |
184f1f77 | 1283 | list_for_each_entry(class_intf, |
ca22e56d | 1284 | &dev->class->p->interfaces, node) |
c47ed219 GKH |
1285 | if (class_intf->remove_dev) |
1286 | class_intf->remove_dev(dev, class_intf); | |
1287 | /* remove the device from the class list */ | |
5a3ceb86 | 1288 | klist_del(&dev->knode_class); |
ca22e56d | 1289 | mutex_unlock(&dev->class->p->mutex); |
b9d9c82b | 1290 | } |
c5e064a6 | 1291 | device_remove_file(dev, &dev_attr_uevent); |
2620efef | 1292 | device_remove_attrs(dev); |
28953533 | 1293 | bus_remove_device(dev); |
4b6d1f12 | 1294 | device_pm_remove(dev); |
d1c3414c | 1295 | driver_deferred_probe_del(dev); |
1da177e4 LT |
1296 | |
1297 | /* Notify the platform of the removal, in case they | |
1298 | * need to do anything... | |
1299 | */ | |
1300 | if (platform_notify_remove) | |
1301 | platform_notify_remove(dev); | |
312c004d | 1302 | kobject_uevent(&dev->kobj, KOBJ_REMOVE); |
da231fd5 | 1303 | cleanup_device_parent(dev); |
1da177e4 | 1304 | kobject_del(&dev->kobj); |
da231fd5 | 1305 | put_device(parent); |
1da177e4 | 1306 | } |
86df2687 | 1307 | EXPORT_SYMBOL_GPL(device_del); |
1da177e4 LT |
1308 | |
1309 | /** | |
4a3ad20c GKH |
1310 | * device_unregister - unregister device from system. |
1311 | * @dev: device going away. | |
1da177e4 | 1312 | * |
4a3ad20c GKH |
1313 | * We do this in two parts, like we do device_register(). First, |
1314 | * we remove it from all the subsystems with device_del(), then | |
1315 | * we decrement the reference count via put_device(). If that | |
1316 | * is the final reference count, the device will be cleaned up | |
1317 | * via device_release() above. Otherwise, the structure will | |
1318 | * stick around until the final reference to the device is dropped. | |
1da177e4 | 1319 | */ |
4a3ad20c | 1320 | void device_unregister(struct device *dev) |
1da177e4 | 1321 | { |
1e0b2cf9 | 1322 | pr_debug("device: '%s': %s\n", dev_name(dev), __func__); |
1da177e4 LT |
1323 | device_del(dev); |
1324 | put_device(dev); | |
1325 | } | |
86df2687 | 1326 | EXPORT_SYMBOL_GPL(device_unregister); |
1da177e4 | 1327 | |
4a3ad20c | 1328 | static struct device *next_device(struct klist_iter *i) |
36239577 | 1329 | { |
4a3ad20c | 1330 | struct klist_node *n = klist_next(i); |
f791b8c8 GKH |
1331 | struct device *dev = NULL; |
1332 | struct device_private *p; | |
1333 | ||
1334 | if (n) { | |
1335 | p = to_device_private_parent(n); | |
1336 | dev = p->device; | |
1337 | } | |
1338 | return dev; | |
36239577 | 1339 | } |
1340 | ||
6fcf53ac | 1341 | /** |
e454cea2 | 1342 | * device_get_devnode - path of device node file |
6fcf53ac | 1343 | * @dev: device |
e454cea2 | 1344 | * @mode: returned file access mode |
3c2670e6 KS |
1345 | * @uid: returned file owner |
1346 | * @gid: returned file group | |
6fcf53ac KS |
1347 | * @tmp: possibly allocated string |
1348 | * | |
1349 | * Return the relative path of a possible device node. | |
1350 | * Non-default names may need to allocate a memory to compose | |
1351 | * a name. This memory is returned in tmp and needs to be | |
1352 | * freed by the caller. | |
1353 | */ | |
e454cea2 | 1354 | const char *device_get_devnode(struct device *dev, |
4e4098a3 | 1355 | umode_t *mode, kuid_t *uid, kgid_t *gid, |
3c2670e6 | 1356 | const char **tmp) |
6fcf53ac KS |
1357 | { |
1358 | char *s; | |
1359 | ||
1360 | *tmp = NULL; | |
1361 | ||
1362 | /* the device type may provide a specific name */ | |
e454cea2 | 1363 | if (dev->type && dev->type->devnode) |
3c2670e6 | 1364 | *tmp = dev->type->devnode(dev, mode, uid, gid); |
6fcf53ac KS |
1365 | if (*tmp) |
1366 | return *tmp; | |
1367 | ||
1368 | /* the class may provide a specific name */ | |
e454cea2 KS |
1369 | if (dev->class && dev->class->devnode) |
1370 | *tmp = dev->class->devnode(dev, mode); | |
6fcf53ac KS |
1371 | if (*tmp) |
1372 | return *tmp; | |
1373 | ||
1374 | /* return name without allocation, tmp == NULL */ | |
1375 | if (strchr(dev_name(dev), '!') == NULL) | |
1376 | return dev_name(dev); | |
1377 | ||
1378 | /* replace '!' in the name with '/' */ | |
1379 | *tmp = kstrdup(dev_name(dev), GFP_KERNEL); | |
1380 | if (!*tmp) | |
1381 | return NULL; | |
1382 | while ((s = strchr(*tmp, '!'))) | |
1383 | s[0] = '/'; | |
1384 | return *tmp; | |
1385 | } | |
1386 | ||
1da177e4 | 1387 | /** |
4a3ad20c GKH |
1388 | * device_for_each_child - device child iterator. |
1389 | * @parent: parent struct device. | |
4a3ad20c | 1390 | * @fn: function to be called for each device. |
f8878dcb | 1391 | * @data: data for the callback. |
1da177e4 | 1392 | * |
4a3ad20c GKH |
1393 | * Iterate over @parent's child devices, and call @fn for each, |
1394 | * passing it @data. | |
1da177e4 | 1395 | * |
4a3ad20c GKH |
1396 | * We check the return of @fn each time. If it returns anything |
1397 | * other than 0, we break out and return that value. | |
1da177e4 | 1398 | */ |
4a3ad20c GKH |
1399 | int device_for_each_child(struct device *parent, void *data, |
1400 | int (*fn)(struct device *dev, void *data)) | |
1da177e4 | 1401 | { |
36239577 | 1402 | struct klist_iter i; |
4a3ad20c | 1403 | struct device *child; |
1da177e4 LT |
1404 | int error = 0; |
1405 | ||
014c90db GKH |
1406 | if (!parent->p) |
1407 | return 0; | |
1408 | ||
f791b8c8 | 1409 | klist_iter_init(&parent->p->klist_children, &i); |
36239577 | 1410 | while ((child = next_device(&i)) && !error) |
1411 | error = fn(child, data); | |
1412 | klist_iter_exit(&i); | |
1da177e4 LT |
1413 | return error; |
1414 | } | |
86df2687 | 1415 | EXPORT_SYMBOL_GPL(device_for_each_child); |
1da177e4 | 1416 | |
5ab69981 CH |
1417 | /** |
1418 | * device_find_child - device iterator for locating a particular device. | |
1419 | * @parent: parent struct device | |
5ab69981 | 1420 | * @match: Callback function to check device |
f8878dcb | 1421 | * @data: Data to pass to match function |
5ab69981 CH |
1422 | * |
1423 | * This is similar to the device_for_each_child() function above, but it | |
1424 | * returns a reference to a device that is 'found' for later use, as | |
1425 | * determined by the @match callback. | |
1426 | * | |
1427 | * The callback should return 0 if the device doesn't match and non-zero | |
1428 | * if it does. If the callback returns non-zero and a reference to the | |
1429 | * current device can be obtained, this function will return to the caller | |
1430 | * and not iterate over any more devices. | |
a4e2400a FV |
1431 | * |
1432 | * NOTE: you will need to drop the reference with put_device() after use. | |
5ab69981 | 1433 | */ |
4a3ad20c GKH |
1434 | struct device *device_find_child(struct device *parent, void *data, |
1435 | int (*match)(struct device *dev, void *data)) | |
5ab69981 CH |
1436 | { |
1437 | struct klist_iter i; | |
1438 | struct device *child; | |
1439 | ||
1440 | if (!parent) | |
1441 | return NULL; | |
1442 | ||
f791b8c8 | 1443 | klist_iter_init(&parent->p->klist_children, &i); |
5ab69981 CH |
1444 | while ((child = next_device(&i))) |
1445 | if (match(child, data) && get_device(child)) | |
1446 | break; | |
1447 | klist_iter_exit(&i); | |
1448 | return child; | |
1449 | } | |
86df2687 | 1450 | EXPORT_SYMBOL_GPL(device_find_child); |
5ab69981 | 1451 | |
1da177e4 LT |
1452 | int __init devices_init(void) |
1453 | { | |
881c6cfd GKH |
1454 | devices_kset = kset_create_and_add("devices", &device_uevent_ops, NULL); |
1455 | if (!devices_kset) | |
1456 | return -ENOMEM; | |
e105b8bf DW |
1457 | dev_kobj = kobject_create_and_add("dev", NULL); |
1458 | if (!dev_kobj) | |
1459 | goto dev_kobj_err; | |
1460 | sysfs_dev_block_kobj = kobject_create_and_add("block", dev_kobj); | |
1461 | if (!sysfs_dev_block_kobj) | |
1462 | goto block_kobj_err; | |
1463 | sysfs_dev_char_kobj = kobject_create_and_add("char", dev_kobj); | |
1464 | if (!sysfs_dev_char_kobj) | |
1465 | goto char_kobj_err; | |
1466 | ||
881c6cfd | 1467 | return 0; |
e105b8bf DW |
1468 | |
1469 | char_kobj_err: | |
1470 | kobject_put(sysfs_dev_block_kobj); | |
1471 | block_kobj_err: | |
1472 | kobject_put(dev_kobj); | |
1473 | dev_kobj_err: | |
1474 | kset_unregister(devices_kset); | |
1475 | return -ENOMEM; | |
1da177e4 LT |
1476 | } |
1477 | ||
4f3549d7 RW |
1478 | static int device_check_offline(struct device *dev, void *not_used) |
1479 | { | |
1480 | int ret; | |
1481 | ||
1482 | ret = device_for_each_child(dev, NULL, device_check_offline); | |
1483 | if (ret) | |
1484 | return ret; | |
1485 | ||
1486 | return device_supports_offline(dev) && !dev->offline ? -EBUSY : 0; | |
1487 | } | |
1488 | ||
1489 | /** | |
1490 | * device_offline - Prepare the device for hot-removal. | |
1491 | * @dev: Device to be put offline. | |
1492 | * | |
1493 | * Execute the device bus type's .offline() callback, if present, to prepare | |
1494 | * the device for a subsequent hot-removal. If that succeeds, the device must | |
1495 | * not be used until either it is removed or its bus type's .online() callback | |
1496 | * is executed. | |
1497 | * | |
1498 | * Call under device_hotplug_lock. | |
1499 | */ | |
1500 | int device_offline(struct device *dev) | |
1501 | { | |
1502 | int ret; | |
1503 | ||
1504 | if (dev->offline_disabled) | |
1505 | return -EPERM; | |
1506 | ||
1507 | ret = device_for_each_child(dev, NULL, device_check_offline); | |
1508 | if (ret) | |
1509 | return ret; | |
1510 | ||
1511 | device_lock(dev); | |
1512 | if (device_supports_offline(dev)) { | |
1513 | if (dev->offline) { | |
1514 | ret = 1; | |
1515 | } else { | |
1516 | ret = dev->bus->offline(dev); | |
1517 | if (!ret) { | |
1518 | kobject_uevent(&dev->kobj, KOBJ_OFFLINE); | |
1519 | dev->offline = true; | |
1520 | } | |
1521 | } | |
1522 | } | |
1523 | device_unlock(dev); | |
1524 | ||
1525 | return ret; | |
1526 | } | |
1527 | ||
1528 | /** | |
1529 | * device_online - Put the device back online after successful device_offline(). | |
1530 | * @dev: Device to be put back online. | |
1531 | * | |
1532 | * If device_offline() has been successfully executed for @dev, but the device | |
1533 | * has not been removed subsequently, execute its bus type's .online() callback | |
1534 | * to indicate that the device can be used again. | |
1535 | * | |
1536 | * Call under device_hotplug_lock. | |
1537 | */ | |
1538 | int device_online(struct device *dev) | |
1539 | { | |
1540 | int ret = 0; | |
1541 | ||
1542 | device_lock(dev); | |
1543 | if (device_supports_offline(dev)) { | |
1544 | if (dev->offline) { | |
1545 | ret = dev->bus->online(dev); | |
1546 | if (!ret) { | |
1547 | kobject_uevent(&dev->kobj, KOBJ_ONLINE); | |
1548 | dev->offline = false; | |
1549 | } | |
1550 | } else { | |
1551 | ret = 1; | |
1552 | } | |
1553 | } | |
1554 | device_unlock(dev); | |
1555 | ||
1556 | return ret; | |
1557 | } | |
1558 | ||
7f100d15 | 1559 | struct root_device { |
0aa0dc41 MM |
1560 | struct device dev; |
1561 | struct module *owner; | |
1562 | }; | |
1563 | ||
93058424 | 1564 | static inline struct root_device *to_root_device(struct device *d) |
481e2079 FW |
1565 | { |
1566 | return container_of(d, struct root_device, dev); | |
1567 | } | |
0aa0dc41 MM |
1568 | |
1569 | static void root_device_release(struct device *dev) | |
1570 | { | |
1571 | kfree(to_root_device(dev)); | |
1572 | } | |
1573 | ||
1574 | /** | |
1575 | * __root_device_register - allocate and register a root device | |
1576 | * @name: root device name | |
1577 | * @owner: owner module of the root device, usually THIS_MODULE | |
1578 | * | |
1579 | * This function allocates a root device and registers it | |
1580 | * using device_register(). In order to free the returned | |
1581 | * device, use root_device_unregister(). | |
1582 | * | |
1583 | * Root devices are dummy devices which allow other devices | |
1584 | * to be grouped under /sys/devices. Use this function to | |
1585 | * allocate a root device and then use it as the parent of | |
1586 | * any device which should appear under /sys/devices/{name} | |
1587 | * | |
1588 | * The /sys/devices/{name} directory will also contain a | |
1589 | * 'module' symlink which points to the @owner directory | |
1590 | * in sysfs. | |
1591 | * | |
f0eae0ed JN |
1592 | * Returns &struct device pointer on success, or ERR_PTR() on error. |
1593 | * | |
0aa0dc41 MM |
1594 | * Note: You probably want to use root_device_register(). |
1595 | */ | |
1596 | struct device *__root_device_register(const char *name, struct module *owner) | |
1597 | { | |
1598 | struct root_device *root; | |
1599 | int err = -ENOMEM; | |
1600 | ||
1601 | root = kzalloc(sizeof(struct root_device), GFP_KERNEL); | |
1602 | if (!root) | |
1603 | return ERR_PTR(err); | |
1604 | ||
acc0e90f | 1605 | err = dev_set_name(&root->dev, "%s", name); |
0aa0dc41 MM |
1606 | if (err) { |
1607 | kfree(root); | |
1608 | return ERR_PTR(err); | |
1609 | } | |
1610 | ||
1611 | root->dev.release = root_device_release; | |
1612 | ||
1613 | err = device_register(&root->dev); | |
1614 | if (err) { | |
1615 | put_device(&root->dev); | |
1616 | return ERR_PTR(err); | |
1617 | } | |
1618 | ||
1d9e882b | 1619 | #ifdef CONFIG_MODULES /* gotta find a "cleaner" way to do this */ |
0aa0dc41 MM |
1620 | if (owner) { |
1621 | struct module_kobject *mk = &owner->mkobj; | |
1622 | ||
1623 | err = sysfs_create_link(&root->dev.kobj, &mk->kobj, "module"); | |
1624 | if (err) { | |
1625 | device_unregister(&root->dev); | |
1626 | return ERR_PTR(err); | |
1627 | } | |
1628 | root->owner = owner; | |
1629 | } | |
1630 | #endif | |
1631 | ||
1632 | return &root->dev; | |
1633 | } | |
1634 | EXPORT_SYMBOL_GPL(__root_device_register); | |
1635 | ||
1636 | /** | |
1637 | * root_device_unregister - unregister and free a root device | |
7cbcf225 | 1638 | * @dev: device going away |
0aa0dc41 MM |
1639 | * |
1640 | * This function unregisters and cleans up a device that was created by | |
1641 | * root_device_register(). | |
1642 | */ | |
1643 | void root_device_unregister(struct device *dev) | |
1644 | { | |
1645 | struct root_device *root = to_root_device(dev); | |
1646 | ||
1647 | if (root->owner) | |
1648 | sysfs_remove_link(&root->dev.kobj, "module"); | |
1649 | ||
1650 | device_unregister(dev); | |
1651 | } | |
1652 | EXPORT_SYMBOL_GPL(root_device_unregister); | |
1653 | ||
23681e47 GKH |
1654 | |
1655 | static void device_create_release(struct device *dev) | |
1656 | { | |
1e0b2cf9 | 1657 | pr_debug("device: '%s': %s\n", dev_name(dev), __func__); |
23681e47 GKH |
1658 | kfree(dev); |
1659 | } | |
1660 | ||
39ef3112 GR |
1661 | static struct device * |
1662 | device_create_groups_vargs(struct class *class, struct device *parent, | |
1663 | dev_t devt, void *drvdata, | |
1664 | const struct attribute_group **groups, | |
1665 | const char *fmt, va_list args) | |
23681e47 | 1666 | { |
23681e47 GKH |
1667 | struct device *dev = NULL; |
1668 | int retval = -ENODEV; | |
1669 | ||
1670 | if (class == NULL || IS_ERR(class)) | |
1671 | goto error; | |
23681e47 GKH |
1672 | |
1673 | dev = kzalloc(sizeof(*dev), GFP_KERNEL); | |
1674 | if (!dev) { | |
1675 | retval = -ENOMEM; | |
1676 | goto error; | |
1677 | } | |
1678 | ||
1679 | dev->devt = devt; | |
1680 | dev->class = class; | |
1681 | dev->parent = parent; | |
39ef3112 | 1682 | dev->groups = groups; |
23681e47 | 1683 | dev->release = device_create_release; |
8882b394 | 1684 | dev_set_drvdata(dev, drvdata); |
23681e47 | 1685 | |
1fa5ae85 KS |
1686 | retval = kobject_set_name_vargs(&dev->kobj, fmt, args); |
1687 | if (retval) | |
1688 | goto error; | |
1689 | ||
23681e47 GKH |
1690 | retval = device_register(dev); |
1691 | if (retval) | |
1692 | goto error; | |
1693 | ||
23681e47 GKH |
1694 | return dev; |
1695 | ||
1696 | error: | |
286661b3 | 1697 | put_device(dev); |
23681e47 GKH |
1698 | return ERR_PTR(retval); |
1699 | } | |
39ef3112 GR |
1700 | |
1701 | /** | |
1702 | * device_create_vargs - creates a device and registers it with sysfs | |
1703 | * @class: pointer to the struct class that this device should be registered to | |
1704 | * @parent: pointer to the parent struct device of this new device, if any | |
1705 | * @devt: the dev_t for the char device to be added | |
1706 | * @drvdata: the data to be added to the device for callbacks | |
1707 | * @fmt: string for the device's name | |
1708 | * @args: va_list for the device's name | |
1709 | * | |
1710 | * This function can be used by char device classes. A struct device | |
1711 | * will be created in sysfs, registered to the specified class. | |
1712 | * | |
1713 | * A "dev" file will be created, showing the dev_t for the device, if | |
1714 | * the dev_t is not 0,0. | |
1715 | * If a pointer to a parent struct device is passed in, the newly created | |
1716 | * struct device will be a child of that device in sysfs. | |
1717 | * The pointer to the struct device will be returned from the call. | |
1718 | * Any further sysfs files that might be required can be created using this | |
1719 | * pointer. | |
1720 | * | |
1721 | * Returns &struct device pointer on success, or ERR_PTR() on error. | |
1722 | * | |
1723 | * Note: the struct class passed to this function must have previously | |
1724 | * been created with a call to class_create(). | |
1725 | */ | |
1726 | struct device *device_create_vargs(struct class *class, struct device *parent, | |
1727 | dev_t devt, void *drvdata, const char *fmt, | |
1728 | va_list args) | |
1729 | { | |
1730 | return device_create_groups_vargs(class, parent, devt, drvdata, NULL, | |
1731 | fmt, args); | |
1732 | } | |
8882b394 GKH |
1733 | EXPORT_SYMBOL_GPL(device_create_vargs); |
1734 | ||
1735 | /** | |
4e106739 | 1736 | * device_create - creates a device and registers it with sysfs |
8882b394 GKH |
1737 | * @class: pointer to the struct class that this device should be registered to |
1738 | * @parent: pointer to the parent struct device of this new device, if any | |
1739 | * @devt: the dev_t for the char device to be added | |
1740 | * @drvdata: the data to be added to the device for callbacks | |
1741 | * @fmt: string for the device's name | |
1742 | * | |
1743 | * This function can be used by char device classes. A struct device | |
1744 | * will be created in sysfs, registered to the specified class. | |
1745 | * | |
1746 | * A "dev" file will be created, showing the dev_t for the device, if | |
1747 | * the dev_t is not 0,0. | |
1748 | * If a pointer to a parent struct device is passed in, the newly created | |
1749 | * struct device will be a child of that device in sysfs. | |
1750 | * The pointer to the struct device will be returned from the call. | |
1751 | * Any further sysfs files that might be required can be created using this | |
1752 | * pointer. | |
1753 | * | |
f0eae0ed JN |
1754 | * Returns &struct device pointer on success, or ERR_PTR() on error. |
1755 | * | |
8882b394 GKH |
1756 | * Note: the struct class passed to this function must have previously |
1757 | * been created with a call to class_create(). | |
1758 | */ | |
4e106739 GKH |
1759 | struct device *device_create(struct class *class, struct device *parent, |
1760 | dev_t devt, void *drvdata, const char *fmt, ...) | |
8882b394 GKH |
1761 | { |
1762 | va_list vargs; | |
1763 | struct device *dev; | |
1764 | ||
1765 | va_start(vargs, fmt); | |
1766 | dev = device_create_vargs(class, parent, devt, drvdata, fmt, vargs); | |
1767 | va_end(vargs); | |
1768 | return dev; | |
1769 | } | |
4e106739 | 1770 | EXPORT_SYMBOL_GPL(device_create); |
8882b394 | 1771 | |
39ef3112 GR |
1772 | /** |
1773 | * device_create_with_groups - creates a device and registers it with sysfs | |
1774 | * @class: pointer to the struct class that this device should be registered to | |
1775 | * @parent: pointer to the parent struct device of this new device, if any | |
1776 | * @devt: the dev_t for the char device to be added | |
1777 | * @drvdata: the data to be added to the device for callbacks | |
1778 | * @groups: NULL-terminated list of attribute groups to be created | |
1779 | * @fmt: string for the device's name | |
1780 | * | |
1781 | * This function can be used by char device classes. A struct device | |
1782 | * will be created in sysfs, registered to the specified class. | |
1783 | * Additional attributes specified in the groups parameter will also | |
1784 | * be created automatically. | |
1785 | * | |
1786 | * A "dev" file will be created, showing the dev_t for the device, if | |
1787 | * the dev_t is not 0,0. | |
1788 | * If a pointer to a parent struct device is passed in, the newly created | |
1789 | * struct device will be a child of that device in sysfs. | |
1790 | * The pointer to the struct device will be returned from the call. | |
1791 | * Any further sysfs files that might be required can be created using this | |
1792 | * pointer. | |
1793 | * | |
1794 | * Returns &struct device pointer on success, or ERR_PTR() on error. | |
1795 | * | |
1796 | * Note: the struct class passed to this function must have previously | |
1797 | * been created with a call to class_create(). | |
1798 | */ | |
1799 | struct device *device_create_with_groups(struct class *class, | |
1800 | struct device *parent, dev_t devt, | |
1801 | void *drvdata, | |
1802 | const struct attribute_group **groups, | |
1803 | const char *fmt, ...) | |
1804 | { | |
1805 | va_list vargs; | |
1806 | struct device *dev; | |
1807 | ||
1808 | va_start(vargs, fmt); | |
1809 | dev = device_create_groups_vargs(class, parent, devt, drvdata, groups, | |
1810 | fmt, vargs); | |
1811 | va_end(vargs); | |
1812 | return dev; | |
1813 | } | |
1814 | EXPORT_SYMBOL_GPL(device_create_with_groups); | |
1815 | ||
9f3b795a | 1816 | static int __match_devt(struct device *dev, const void *data) |
23681e47 | 1817 | { |
9f3b795a | 1818 | const dev_t *devt = data; |
23681e47 | 1819 | |
cd35449b | 1820 | return dev->devt == *devt; |
775b64d2 RW |
1821 | } |
1822 | ||
1823 | /** | |
1824 | * device_destroy - removes a device that was created with device_create() | |
1825 | * @class: pointer to the struct class that this device was registered with | |
1826 | * @devt: the dev_t of the device that was previously registered | |
1827 | * | |
1828 | * This call unregisters and cleans up a device that was created with a | |
1829 | * call to device_create(). | |
1830 | */ | |
1831 | void device_destroy(struct class *class, dev_t devt) | |
1832 | { | |
1833 | struct device *dev; | |
23681e47 | 1834 | |
695794ae | 1835 | dev = class_find_device(class, NULL, &devt, __match_devt); |
cd35449b DY |
1836 | if (dev) { |
1837 | put_device(dev); | |
23681e47 | 1838 | device_unregister(dev); |
cd35449b | 1839 | } |
23681e47 GKH |
1840 | } |
1841 | EXPORT_SYMBOL_GPL(device_destroy); | |
a2de48ca GKH |
1842 | |
1843 | /** | |
1844 | * device_rename - renames a device | |
1845 | * @dev: the pointer to the struct device to be renamed | |
1846 | * @new_name: the new name of the device | |
030c1d2b EB |
1847 | * |
1848 | * It is the responsibility of the caller to provide mutual | |
1849 | * exclusion between two different calls of device_rename | |
1850 | * on the same device to ensure that new_name is valid and | |
1851 | * won't conflict with other devices. | |
c6c0ac66 | 1852 | * |
a5462516 TT |
1853 | * Note: Don't call this function. Currently, the networking layer calls this |
1854 | * function, but that will change. The following text from Kay Sievers offers | |
1855 | * some insight: | |
1856 | * | |
1857 | * Renaming devices is racy at many levels, symlinks and other stuff are not | |
1858 | * replaced atomically, and you get a "move" uevent, but it's not easy to | |
1859 | * connect the event to the old and new device. Device nodes are not renamed at | |
1860 | * all, there isn't even support for that in the kernel now. | |
1861 | * | |
1862 | * In the meantime, during renaming, your target name might be taken by another | |
1863 | * driver, creating conflicts. Or the old name is taken directly after you | |
1864 | * renamed it -- then you get events for the same DEVPATH, before you even see | |
1865 | * the "move" event. It's just a mess, and nothing new should ever rely on | |
1866 | * kernel device renaming. Besides that, it's not even implemented now for | |
1867 | * other things than (driver-core wise very simple) network devices. | |
1868 | * | |
1869 | * We are currently about to change network renaming in udev to completely | |
1870 | * disallow renaming of devices in the same namespace as the kernel uses, | |
1871 | * because we can't solve the problems properly, that arise with swapping names | |
1872 | * of multiple interfaces without races. Means, renaming of eth[0-9]* will only | |
1873 | * be allowed to some other name than eth[0-9]*, for the aforementioned | |
1874 | * reasons. | |
1875 | * | |
1876 | * Make up a "real" name in the driver before you register anything, or add | |
1877 | * some other attributes for userspace to find the device, or use udev to add | |
1878 | * symlinks -- but never rename kernel devices later, it's a complete mess. We | |
1879 | * don't even want to get into that and try to implement the missing pieces in | |
1880 | * the core. We really have other pieces to fix in the driver core mess. :) | |
a2de48ca | 1881 | */ |
6937e8f8 | 1882 | int device_rename(struct device *dev, const char *new_name) |
a2de48ca | 1883 | { |
2ee97caf | 1884 | char *old_device_name = NULL; |
a2de48ca GKH |
1885 | int error; |
1886 | ||
1887 | dev = get_device(dev); | |
1888 | if (!dev) | |
1889 | return -EINVAL; | |
1890 | ||
1e0b2cf9 | 1891 | pr_debug("device: '%s': %s: renaming to '%s'\n", dev_name(dev), |
2b3a302a | 1892 | __func__, new_name); |
a2de48ca | 1893 | |
1fa5ae85 | 1894 | old_device_name = kstrdup(dev_name(dev), GFP_KERNEL); |
2ee97caf CH |
1895 | if (!old_device_name) { |
1896 | error = -ENOMEM; | |
1897 | goto out; | |
a2de48ca | 1898 | } |
a2de48ca | 1899 | |
f349cf34 | 1900 | if (dev->class) { |
6b6e39a6 | 1901 | error = sysfs_rename_link(&dev->class->p->subsys.kobj, |
f349cf34 EB |
1902 | &dev->kobj, old_device_name, new_name); |
1903 | if (error) | |
1904 | goto out; | |
1905 | } | |
39aba963 | 1906 | |
a2de48ca | 1907 | error = kobject_rename(&dev->kobj, new_name); |
1fa5ae85 | 1908 | if (error) |
2ee97caf | 1909 | goto out; |
a2de48ca | 1910 | |
2ee97caf | 1911 | out: |
a2de48ca GKH |
1912 | put_device(dev); |
1913 | ||
2ee97caf | 1914 | kfree(old_device_name); |
a2de48ca GKH |
1915 | |
1916 | return error; | |
1917 | } | |
a2807dbc | 1918 | EXPORT_SYMBOL_GPL(device_rename); |
8a82472f CH |
1919 | |
1920 | static int device_move_class_links(struct device *dev, | |
1921 | struct device *old_parent, | |
1922 | struct device *new_parent) | |
1923 | { | |
f7f3461d | 1924 | int error = 0; |
8a82472f | 1925 | |
f7f3461d GKH |
1926 | if (old_parent) |
1927 | sysfs_remove_link(&dev->kobj, "device"); | |
1928 | if (new_parent) | |
1929 | error = sysfs_create_link(&dev->kobj, &new_parent->kobj, | |
1930 | "device"); | |
1931 | return error; | |
8a82472f CH |
1932 | } |
1933 | ||
1934 | /** | |
1935 | * device_move - moves a device to a new parent | |
1936 | * @dev: the pointer to the struct device to be moved | |
c744aeae | 1937 | * @new_parent: the new parent of the device (can by NULL) |
ffa6a705 | 1938 | * @dpm_order: how to reorder the dpm_list |
8a82472f | 1939 | */ |
ffa6a705 CH |
1940 | int device_move(struct device *dev, struct device *new_parent, |
1941 | enum dpm_order dpm_order) | |
8a82472f CH |
1942 | { |
1943 | int error; | |
1944 | struct device *old_parent; | |
c744aeae | 1945 | struct kobject *new_parent_kobj; |
8a82472f CH |
1946 | |
1947 | dev = get_device(dev); | |
1948 | if (!dev) | |
1949 | return -EINVAL; | |
1950 | ||
ffa6a705 | 1951 | device_pm_lock(); |
8a82472f | 1952 | new_parent = get_device(new_parent); |
4a3ad20c | 1953 | new_parent_kobj = get_device_parent(dev, new_parent); |
63b6971a | 1954 | |
1e0b2cf9 KS |
1955 | pr_debug("device: '%s': %s: moving to '%s'\n", dev_name(dev), |
1956 | __func__, new_parent ? dev_name(new_parent) : "<NULL>"); | |
c744aeae | 1957 | error = kobject_move(&dev->kobj, new_parent_kobj); |
8a82472f | 1958 | if (error) { |
63b6971a | 1959 | cleanup_glue_dir(dev, new_parent_kobj); |
8a82472f CH |
1960 | put_device(new_parent); |
1961 | goto out; | |
1962 | } | |
1963 | old_parent = dev->parent; | |
1964 | dev->parent = new_parent; | |
1965 | if (old_parent) | |
f791b8c8 | 1966 | klist_remove(&dev->p->knode_parent); |
0d358f22 | 1967 | if (new_parent) { |
f791b8c8 GKH |
1968 | klist_add_tail(&dev->p->knode_parent, |
1969 | &new_parent->p->klist_children); | |
0d358f22 YL |
1970 | set_dev_node(dev, dev_to_node(new_parent)); |
1971 | } | |
1972 | ||
bdd4034d RV |
1973 | if (dev->class) { |
1974 | error = device_move_class_links(dev, old_parent, new_parent); | |
1975 | if (error) { | |
1976 | /* We ignore errors on cleanup since we're hosed anyway... */ | |
1977 | device_move_class_links(dev, new_parent, old_parent); | |
1978 | if (!kobject_move(&dev->kobj, &old_parent->kobj)) { | |
1979 | if (new_parent) | |
1980 | klist_remove(&dev->p->knode_parent); | |
1981 | dev->parent = old_parent; | |
1982 | if (old_parent) { | |
1983 | klist_add_tail(&dev->p->knode_parent, | |
1984 | &old_parent->p->klist_children); | |
1985 | set_dev_node(dev, dev_to_node(old_parent)); | |
1986 | } | |
0d358f22 | 1987 | } |
bdd4034d RV |
1988 | cleanup_glue_dir(dev, new_parent_kobj); |
1989 | put_device(new_parent); | |
1990 | goto out; | |
8a82472f | 1991 | } |
8a82472f | 1992 | } |
ffa6a705 CH |
1993 | switch (dpm_order) { |
1994 | case DPM_ORDER_NONE: | |
1995 | break; | |
1996 | case DPM_ORDER_DEV_AFTER_PARENT: | |
1997 | device_pm_move_after(dev, new_parent); | |
1998 | break; | |
1999 | case DPM_ORDER_PARENT_BEFORE_DEV: | |
2000 | device_pm_move_before(new_parent, dev); | |
2001 | break; | |
2002 | case DPM_ORDER_DEV_LAST: | |
2003 | device_pm_move_last(dev); | |
2004 | break; | |
2005 | } | |
bdd4034d | 2006 | |
8a82472f CH |
2007 | put_device(old_parent); |
2008 | out: | |
ffa6a705 | 2009 | device_pm_unlock(); |
8a82472f CH |
2010 | put_device(dev); |
2011 | return error; | |
2012 | } | |
8a82472f | 2013 | EXPORT_SYMBOL_GPL(device_move); |
37b0c020 GKH |
2014 | |
2015 | /** | |
2016 | * device_shutdown - call ->shutdown() on each device to shutdown. | |
2017 | */ | |
2018 | void device_shutdown(void) | |
2019 | { | |
f123db8e | 2020 | struct device *dev, *parent; |
6245838f HD |
2021 | |
2022 | spin_lock(&devices_kset->list_lock); | |
2023 | /* | |
2024 | * Walk the devices list backward, shutting down each in turn. | |
2025 | * Beware that device unplug events may also start pulling | |
2026 | * devices offline, even as the system is shutting down. | |
2027 | */ | |
2028 | while (!list_empty(&devices_kset->list)) { | |
2029 | dev = list_entry(devices_kset->list.prev, struct device, | |
2030 | kobj.entry); | |
d1c6c030 ML |
2031 | |
2032 | /* | |
2033 | * hold reference count of device's parent to | |
2034 | * prevent it from being freed because parent's | |
2035 | * lock is to be held | |
2036 | */ | |
f123db8e | 2037 | parent = get_device(dev->parent); |
6245838f HD |
2038 | get_device(dev); |
2039 | /* | |
2040 | * Make sure the device is off the kset list, in the | |
2041 | * event that dev->*->shutdown() doesn't remove it. | |
2042 | */ | |
2043 | list_del_init(&dev->kobj.entry); | |
2044 | spin_unlock(&devices_kset->list_lock); | |
fe6b91f4 | 2045 | |
d1c6c030 | 2046 | /* hold lock to avoid race with probe/release */ |
f123db8e BL |
2047 | if (parent) |
2048 | device_lock(parent); | |
d1c6c030 ML |
2049 | device_lock(dev); |
2050 | ||
fe6b91f4 AS |
2051 | /* Don't allow any more runtime suspends */ |
2052 | pm_runtime_get_noresume(dev); | |
2053 | pm_runtime_barrier(dev); | |
37b0c020 | 2054 | |
37b0c020 | 2055 | if (dev->bus && dev->bus->shutdown) { |
0246c4fa SL |
2056 | if (initcall_debug) |
2057 | dev_info(dev, "shutdown\n"); | |
37b0c020 GKH |
2058 | dev->bus->shutdown(dev); |
2059 | } else if (dev->driver && dev->driver->shutdown) { | |
0246c4fa SL |
2060 | if (initcall_debug) |
2061 | dev_info(dev, "shutdown\n"); | |
37b0c020 GKH |
2062 | dev->driver->shutdown(dev); |
2063 | } | |
d1c6c030 ML |
2064 | |
2065 | device_unlock(dev); | |
f123db8e BL |
2066 | if (parent) |
2067 | device_unlock(parent); | |
d1c6c030 | 2068 | |
6245838f | 2069 | put_device(dev); |
f123db8e | 2070 | put_device(parent); |
6245838f HD |
2071 | |
2072 | spin_lock(&devices_kset->list_lock); | |
37b0c020 | 2073 | } |
6245838f | 2074 | spin_unlock(&devices_kset->list_lock); |
401097ea | 2075 | async_synchronize_full(); |
37b0c020 | 2076 | } |
99bcf217 JP |
2077 | |
2078 | /* | |
2079 | * Device logging functions | |
2080 | */ | |
2081 | ||
2082 | #ifdef CONFIG_PRINTK | |
666f355f JP |
2083 | static int |
2084 | create_syslog_header(const struct device *dev, char *hdr, size_t hdrlen) | |
99bcf217 | 2085 | { |
c4e00daa | 2086 | const char *subsys; |
798efc60 | 2087 | size_t pos = 0; |
99bcf217 | 2088 | |
c4e00daa KS |
2089 | if (dev->class) |
2090 | subsys = dev->class->name; | |
2091 | else if (dev->bus) | |
2092 | subsys = dev->bus->name; | |
2093 | else | |
798efc60 | 2094 | return 0; |
c4e00daa | 2095 | |
798efc60 | 2096 | pos += snprintf(hdr + pos, hdrlen - pos, "SUBSYSTEM=%s", subsys); |
c4e00daa KS |
2097 | |
2098 | /* | |
2099 | * Add device identifier DEVICE=: | |
2100 | * b12:8 block dev_t | |
2101 | * c127:3 char dev_t | |
2102 | * n8 netdev ifindex | |
2103 | * +sound:card0 subsystem:devname | |
2104 | */ | |
2105 | if (MAJOR(dev->devt)) { | |
2106 | char c; | |
2107 | ||
2108 | if (strcmp(subsys, "block") == 0) | |
2109 | c = 'b'; | |
2110 | else | |
2111 | c = 'c'; | |
798efc60 JP |
2112 | pos++; |
2113 | pos += snprintf(hdr + pos, hdrlen - pos, | |
2114 | "DEVICE=%c%u:%u", | |
2115 | c, MAJOR(dev->devt), MINOR(dev->devt)); | |
c4e00daa KS |
2116 | } else if (strcmp(subsys, "net") == 0) { |
2117 | struct net_device *net = to_net_dev(dev); | |
2118 | ||
798efc60 JP |
2119 | pos++; |
2120 | pos += snprintf(hdr + pos, hdrlen - pos, | |
2121 | "DEVICE=n%u", net->ifindex); | |
c4e00daa | 2122 | } else { |
798efc60 JP |
2123 | pos++; |
2124 | pos += snprintf(hdr + pos, hdrlen - pos, | |
2125 | "DEVICE=+%s:%s", subsys, dev_name(dev)); | |
c4e00daa | 2126 | } |
af7f2158 | 2127 | |
798efc60 JP |
2128 | return pos; |
2129 | } | |
2130 | EXPORT_SYMBOL(create_syslog_header); | |
2131 | ||
05e4e5b8 JP |
2132 | int dev_vprintk_emit(int level, const struct device *dev, |
2133 | const char *fmt, va_list args) | |
2134 | { | |
2135 | char hdr[128]; | |
2136 | size_t hdrlen; | |
2137 | ||
2138 | hdrlen = create_syslog_header(dev, hdr, sizeof(hdr)); | |
2139 | ||
2140 | return vprintk_emit(0, level, hdrlen ? hdr : NULL, hdrlen, fmt, args); | |
2141 | } | |
2142 | EXPORT_SYMBOL(dev_vprintk_emit); | |
2143 | ||
2144 | int dev_printk_emit(int level, const struct device *dev, const char *fmt, ...) | |
2145 | { | |
2146 | va_list args; | |
2147 | int r; | |
2148 | ||
2149 | va_start(args, fmt); | |
2150 | ||
2151 | r = dev_vprintk_emit(level, dev, fmt, args); | |
2152 | ||
2153 | va_end(args); | |
2154 | ||
2155 | return r; | |
2156 | } | |
2157 | EXPORT_SYMBOL(dev_printk_emit); | |
2158 | ||
798efc60 JP |
2159 | static int __dev_printk(const char *level, const struct device *dev, |
2160 | struct va_format *vaf) | |
2161 | { | |
798efc60 JP |
2162 | if (!dev) |
2163 | return printk("%s(NULL device *): %pV", level, vaf); | |
2164 | ||
666f355f JP |
2165 | return dev_printk_emit(level[1] - '0', dev, |
2166 | "%s %s: %pV", | |
2167 | dev_driver_string(dev), dev_name(dev), vaf); | |
99bcf217 JP |
2168 | } |
2169 | ||
2170 | int dev_printk(const char *level, const struct device *dev, | |
2171 | const char *fmt, ...) | |
2172 | { | |
2173 | struct va_format vaf; | |
2174 | va_list args; | |
2175 | int r; | |
2176 | ||
2177 | va_start(args, fmt); | |
2178 | ||
2179 | vaf.fmt = fmt; | |
2180 | vaf.va = &args; | |
2181 | ||
2182 | r = __dev_printk(level, dev, &vaf); | |
798efc60 | 2183 | |
99bcf217 JP |
2184 | va_end(args); |
2185 | ||
2186 | return r; | |
2187 | } | |
2188 | EXPORT_SYMBOL(dev_printk); | |
2189 | ||
2190 | #define define_dev_printk_level(func, kern_level) \ | |
2191 | int func(const struct device *dev, const char *fmt, ...) \ | |
2192 | { \ | |
2193 | struct va_format vaf; \ | |
2194 | va_list args; \ | |
2195 | int r; \ | |
2196 | \ | |
2197 | va_start(args, fmt); \ | |
2198 | \ | |
2199 | vaf.fmt = fmt; \ | |
2200 | vaf.va = &args; \ | |
2201 | \ | |
2202 | r = __dev_printk(kern_level, dev, &vaf); \ | |
798efc60 | 2203 | \ |
99bcf217 JP |
2204 | va_end(args); \ |
2205 | \ | |
2206 | return r; \ | |
2207 | } \ | |
2208 | EXPORT_SYMBOL(func); | |
2209 | ||
2210 | define_dev_printk_level(dev_emerg, KERN_EMERG); | |
2211 | define_dev_printk_level(dev_alert, KERN_ALERT); | |
2212 | define_dev_printk_level(dev_crit, KERN_CRIT); | |
2213 | define_dev_printk_level(dev_err, KERN_ERR); | |
2214 | define_dev_printk_level(dev_warn, KERN_WARNING); | |
2215 | define_dev_printk_level(dev_notice, KERN_NOTICE); | |
2216 | define_dev_printk_level(_dev_info, KERN_INFO); | |
2217 | ||
2218 | #endif |