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> |
af8db150 | 26 | #include <linux/pm_runtime.h> |
c4e00daa | 27 | #include <linux/netdevice.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 | ||
4a3ad20c GKH |
46 | int (*platform_notify)(struct device *dev) = NULL; |
47 | int (*platform_notify_remove)(struct device *dev) = NULL; | |
e105b8bf DW |
48 | static struct kobject *dev_kobj; |
49 | struct kobject *sysfs_dev_char_kobj; | |
50 | struct kobject *sysfs_dev_block_kobj; | |
1da177e4 | 51 | |
5e33bc41 RW |
52 | static DEFINE_MUTEX(device_hotplug_lock); |
53 | ||
54 | void lock_device_hotplug(void) | |
55 | { | |
56 | mutex_lock(&device_hotplug_lock); | |
57 | } | |
58 | ||
59 | void unlock_device_hotplug(void) | |
60 | { | |
61 | mutex_unlock(&device_hotplug_lock); | |
62 | } | |
63 | ||
64 | int lock_device_hotplug_sysfs(void) | |
65 | { | |
66 | if (mutex_trylock(&device_hotplug_lock)) | |
67 | return 0; | |
68 | ||
69 | /* Avoid busy looping (5 ms of sleep should do). */ | |
70 | msleep(5); | |
71 | return restart_syscall(); | |
72 | } | |
73 | ||
4e886c29 GKH |
74 | #ifdef CONFIG_BLOCK |
75 | static inline int device_is_not_partition(struct device *dev) | |
76 | { | |
77 | return !(dev->type == &part_type); | |
78 | } | |
79 | #else | |
80 | static inline int device_is_not_partition(struct device *dev) | |
81 | { | |
82 | return 1; | |
83 | } | |
84 | #endif | |
1da177e4 | 85 | |
3e95637a AS |
86 | /** |
87 | * dev_driver_string - Return a device's driver name, if at all possible | |
88 | * @dev: struct device to get the name of | |
89 | * | |
90 | * Will return the device's driver's name if it is bound to a device. If | |
9169c012 | 91 | * the device is not bound to a driver, it will return the name of the bus |
3e95637a AS |
92 | * it is attached to. If it is not attached to a bus either, an empty |
93 | * string will be returned. | |
94 | */ | |
bf9ca69f | 95 | const char *dev_driver_string(const struct device *dev) |
3e95637a | 96 | { |
3589972e AS |
97 | struct device_driver *drv; |
98 | ||
99 | /* dev->driver can change to NULL underneath us because of unbinding, | |
100 | * so be careful about accessing it. dev->bus and dev->class should | |
101 | * never change once they are set, so they don't need special care. | |
102 | */ | |
103 | drv = ACCESS_ONCE(dev->driver); | |
104 | return drv ? drv->name : | |
a456b702 JD |
105 | (dev->bus ? dev->bus->name : |
106 | (dev->class ? dev->class->name : "")); | |
3e95637a | 107 | } |
310a922d | 108 | EXPORT_SYMBOL(dev_driver_string); |
3e95637a | 109 | |
1da177e4 LT |
110 | #define to_dev_attr(_attr) container_of(_attr, struct device_attribute, attr) |
111 | ||
4a3ad20c GKH |
112 | static ssize_t dev_attr_show(struct kobject *kobj, struct attribute *attr, |
113 | char *buf) | |
1da177e4 | 114 | { |
4a3ad20c | 115 | struct device_attribute *dev_attr = to_dev_attr(attr); |
b0d1f807 | 116 | struct device *dev = kobj_to_dev(kobj); |
4a0c20bf | 117 | ssize_t ret = -EIO; |
1da177e4 LT |
118 | |
119 | if (dev_attr->show) | |
54b6f35c | 120 | ret = dev_attr->show(dev, dev_attr, buf); |
815d2d50 | 121 | if (ret >= (ssize_t)PAGE_SIZE) { |
53a9c87e GKH |
122 | print_symbol("dev_attr_show: %s returned bad count\n", |
123 | (unsigned long)dev_attr->show); | |
815d2d50 | 124 | } |
1da177e4 LT |
125 | return ret; |
126 | } | |
127 | ||
4a3ad20c GKH |
128 | static ssize_t dev_attr_store(struct kobject *kobj, struct attribute *attr, |
129 | const char *buf, size_t count) | |
1da177e4 | 130 | { |
4a3ad20c | 131 | struct device_attribute *dev_attr = to_dev_attr(attr); |
b0d1f807 | 132 | struct device *dev = kobj_to_dev(kobj); |
4a0c20bf | 133 | ssize_t ret = -EIO; |
1da177e4 LT |
134 | |
135 | if (dev_attr->store) | |
54b6f35c | 136 | ret = dev_attr->store(dev, dev_attr, buf, count); |
1da177e4 LT |
137 | return ret; |
138 | } | |
139 | ||
52cf25d0 | 140 | static const struct sysfs_ops dev_sysfs_ops = { |
1da177e4 LT |
141 | .show = dev_attr_show, |
142 | .store = dev_attr_store, | |
143 | }; | |
144 | ||
ca22e56d KS |
145 | #define to_ext_attr(x) container_of(x, struct dev_ext_attribute, attr) |
146 | ||
147 | ssize_t device_store_ulong(struct device *dev, | |
148 | struct device_attribute *attr, | |
149 | const char *buf, size_t size) | |
150 | { | |
151 | struct dev_ext_attribute *ea = to_ext_attr(attr); | |
152 | char *end; | |
153 | unsigned long new = simple_strtoul(buf, &end, 0); | |
154 | if (end == buf) | |
155 | return -EINVAL; | |
156 | *(unsigned long *)(ea->var) = new; | |
157 | /* Always return full write size even if we didn't consume all */ | |
158 | return size; | |
159 | } | |
160 | EXPORT_SYMBOL_GPL(device_store_ulong); | |
161 | ||
162 | ssize_t device_show_ulong(struct device *dev, | |
163 | struct device_attribute *attr, | |
164 | char *buf) | |
165 | { | |
166 | struct dev_ext_attribute *ea = to_ext_attr(attr); | |
167 | return snprintf(buf, PAGE_SIZE, "%lx\n", *(unsigned long *)(ea->var)); | |
168 | } | |
169 | EXPORT_SYMBOL_GPL(device_show_ulong); | |
170 | ||
171 | ssize_t device_store_int(struct device *dev, | |
172 | struct device_attribute *attr, | |
173 | const char *buf, size_t size) | |
174 | { | |
175 | struct dev_ext_attribute *ea = to_ext_attr(attr); | |
176 | char *end; | |
177 | long new = simple_strtol(buf, &end, 0); | |
178 | if (end == buf || new > INT_MAX || new < INT_MIN) | |
179 | return -EINVAL; | |
180 | *(int *)(ea->var) = new; | |
181 | /* Always return full write size even if we didn't consume all */ | |
182 | return size; | |
183 | } | |
184 | EXPORT_SYMBOL_GPL(device_store_int); | |
185 | ||
186 | ssize_t device_show_int(struct device *dev, | |
187 | struct device_attribute *attr, | |
188 | char *buf) | |
189 | { | |
190 | struct dev_ext_attribute *ea = to_ext_attr(attr); | |
191 | ||
192 | return snprintf(buf, PAGE_SIZE, "%d\n", *(int *)(ea->var)); | |
193 | } | |
194 | EXPORT_SYMBOL_GPL(device_show_int); | |
1da177e4 | 195 | |
91872392 BP |
196 | ssize_t device_store_bool(struct device *dev, struct device_attribute *attr, |
197 | const char *buf, size_t size) | |
198 | { | |
199 | struct dev_ext_attribute *ea = to_ext_attr(attr); | |
200 | ||
201 | if (strtobool(buf, ea->var) < 0) | |
202 | return -EINVAL; | |
203 | ||
204 | return size; | |
205 | } | |
206 | EXPORT_SYMBOL_GPL(device_store_bool); | |
207 | ||
208 | ssize_t device_show_bool(struct device *dev, struct device_attribute *attr, | |
209 | char *buf) | |
210 | { | |
211 | struct dev_ext_attribute *ea = to_ext_attr(attr); | |
212 | ||
213 | return snprintf(buf, PAGE_SIZE, "%d\n", *(bool *)(ea->var)); | |
214 | } | |
215 | EXPORT_SYMBOL_GPL(device_show_bool); | |
216 | ||
1da177e4 | 217 | /** |
f8878dcb RD |
218 | * device_release - free device structure. |
219 | * @kobj: device's kobject. | |
1da177e4 | 220 | * |
f8878dcb RD |
221 | * This is called once the reference count for the object |
222 | * reaches 0. We forward the call to the device's release | |
223 | * method, which should handle actually freeing the structure. | |
1da177e4 | 224 | */ |
4a3ad20c | 225 | static void device_release(struct kobject *kobj) |
1da177e4 | 226 | { |
b0d1f807 | 227 | struct device *dev = kobj_to_dev(kobj); |
fb069a5d | 228 | struct device_private *p = dev->p; |
1da177e4 | 229 | |
a525a3dd ML |
230 | /* |
231 | * Some platform devices are driven without driver attached | |
232 | * and managed resources may have been acquired. Make sure | |
233 | * all resources are released. | |
234 | * | |
235 | * Drivers still can add resources into device after device | |
236 | * is deleted but alive, so release devres here to avoid | |
237 | * possible memory leak. | |
238 | */ | |
239 | devres_release_all(dev); | |
240 | ||
1da177e4 LT |
241 | if (dev->release) |
242 | dev->release(dev); | |
f9f852df KS |
243 | else if (dev->type && dev->type->release) |
244 | dev->type->release(dev); | |
2620efef GKH |
245 | else if (dev->class && dev->class->dev_release) |
246 | dev->class->dev_release(dev); | |
f810a5cf AV |
247 | else |
248 | WARN(1, KERN_ERR "Device '%s' does not have a release() " | |
4a3ad20c | 249 | "function, it is broken and must be fixed.\n", |
1e0b2cf9 | 250 | dev_name(dev)); |
fb069a5d | 251 | kfree(p); |
1da177e4 LT |
252 | } |
253 | ||
bc451f20 EB |
254 | static const void *device_namespace(struct kobject *kobj) |
255 | { | |
b0d1f807 | 256 | struct device *dev = kobj_to_dev(kobj); |
bc451f20 EB |
257 | const void *ns = NULL; |
258 | ||
259 | if (dev->class && dev->class->ns_type) | |
260 | ns = dev->class->namespace(dev); | |
261 | ||
262 | return ns; | |
263 | } | |
264 | ||
8f4afc41 | 265 | static struct kobj_type device_ktype = { |
1da177e4 LT |
266 | .release = device_release, |
267 | .sysfs_ops = &dev_sysfs_ops, | |
bc451f20 | 268 | .namespace = device_namespace, |
1da177e4 LT |
269 | }; |
270 | ||
271 | ||
312c004d | 272 | static int dev_uevent_filter(struct kset *kset, struct kobject *kobj) |
1da177e4 LT |
273 | { |
274 | struct kobj_type *ktype = get_ktype(kobj); | |
275 | ||
8f4afc41 | 276 | if (ktype == &device_ktype) { |
b0d1f807 | 277 | struct device *dev = kobj_to_dev(kobj); |
1da177e4 LT |
278 | if (dev->bus) |
279 | return 1; | |
23681e47 GKH |
280 | if (dev->class) |
281 | return 1; | |
1da177e4 LT |
282 | } |
283 | return 0; | |
284 | } | |
285 | ||
312c004d | 286 | static const char *dev_uevent_name(struct kset *kset, struct kobject *kobj) |
1da177e4 | 287 | { |
b0d1f807 | 288 | struct device *dev = kobj_to_dev(kobj); |
1da177e4 | 289 | |
23681e47 GKH |
290 | if (dev->bus) |
291 | return dev->bus->name; | |
292 | if (dev->class) | |
293 | return dev->class->name; | |
294 | return NULL; | |
1da177e4 LT |
295 | } |
296 | ||
7eff2e7a KS |
297 | static int dev_uevent(struct kset *kset, struct kobject *kobj, |
298 | struct kobj_uevent_env *env) | |
1da177e4 | 299 | { |
b0d1f807 | 300 | struct device *dev = kobj_to_dev(kobj); |
1da177e4 LT |
301 | int retval = 0; |
302 | ||
6fcf53ac | 303 | /* add device node properties if present */ |
23681e47 | 304 | if (MAJOR(dev->devt)) { |
6fcf53ac KS |
305 | const char *tmp; |
306 | const char *name; | |
2c9ede55 | 307 | umode_t mode = 0; |
4e4098a3 GKH |
308 | kuid_t uid = GLOBAL_ROOT_UID; |
309 | kgid_t gid = GLOBAL_ROOT_GID; | |
6fcf53ac | 310 | |
7eff2e7a KS |
311 | add_uevent_var(env, "MAJOR=%u", MAJOR(dev->devt)); |
312 | add_uevent_var(env, "MINOR=%u", MINOR(dev->devt)); | |
3c2670e6 | 313 | name = device_get_devnode(dev, &mode, &uid, &gid, &tmp); |
6fcf53ac KS |
314 | if (name) { |
315 | add_uevent_var(env, "DEVNAME=%s", name); | |
e454cea2 KS |
316 | if (mode) |
317 | add_uevent_var(env, "DEVMODE=%#o", mode & 0777); | |
4e4098a3 GKH |
318 | if (!uid_eq(uid, GLOBAL_ROOT_UID)) |
319 | add_uevent_var(env, "DEVUID=%u", from_kuid(&init_user_ns, uid)); | |
320 | if (!gid_eq(gid, GLOBAL_ROOT_GID)) | |
321 | add_uevent_var(env, "DEVGID=%u", from_kgid(&init_user_ns, gid)); | |
3c2670e6 | 322 | kfree(tmp); |
6fcf53ac | 323 | } |
23681e47 GKH |
324 | } |
325 | ||
414264f9 | 326 | if (dev->type && dev->type->name) |
7eff2e7a | 327 | add_uevent_var(env, "DEVTYPE=%s", dev->type->name); |
414264f9 | 328 | |
239378f1 | 329 | if (dev->driver) |
7eff2e7a | 330 | add_uevent_var(env, "DRIVER=%s", dev->driver->name); |
239378f1 | 331 | |
07d57a32 GL |
332 | /* Add common DT information about the device */ |
333 | of_device_uevent(dev, env); | |
334 | ||
7eff2e7a | 335 | /* have the bus specific function add its stuff */ |
312c004d | 336 | if (dev->bus && dev->bus->uevent) { |
7eff2e7a | 337 | retval = dev->bus->uevent(dev, env); |
f9f852df | 338 | if (retval) |
7dc72b28 | 339 | pr_debug("device: '%s': %s: bus uevent() returned %d\n", |
1e0b2cf9 | 340 | dev_name(dev), __func__, retval); |
1da177e4 LT |
341 | } |
342 | ||
7eff2e7a | 343 | /* have the class specific function add its stuff */ |
2620efef | 344 | if (dev->class && dev->class->dev_uevent) { |
7eff2e7a | 345 | retval = dev->class->dev_uevent(dev, env); |
f9f852df | 346 | if (retval) |
7dc72b28 | 347 | pr_debug("device: '%s': %s: class uevent() " |
1e0b2cf9 | 348 | "returned %d\n", dev_name(dev), |
2b3a302a | 349 | __func__, retval); |
f9f852df KS |
350 | } |
351 | ||
eef35c2d | 352 | /* have the device type specific function add its stuff */ |
f9f852df | 353 | if (dev->type && dev->type->uevent) { |
7eff2e7a | 354 | retval = dev->type->uevent(dev, env); |
f9f852df | 355 | if (retval) |
7dc72b28 | 356 | pr_debug("device: '%s': %s: dev_type uevent() " |
1e0b2cf9 | 357 | "returned %d\n", dev_name(dev), |
2b3a302a | 358 | __func__, retval); |
2620efef GKH |
359 | } |
360 | ||
1da177e4 LT |
361 | return retval; |
362 | } | |
363 | ||
9cd43611 | 364 | static const struct kset_uevent_ops device_uevent_ops = { |
312c004d KS |
365 | .filter = dev_uevent_filter, |
366 | .name = dev_uevent_name, | |
367 | .uevent = dev_uevent, | |
1da177e4 LT |
368 | }; |
369 | ||
c5e064a6 | 370 | static ssize_t uevent_show(struct device *dev, struct device_attribute *attr, |
16574dcc KS |
371 | char *buf) |
372 | { | |
373 | struct kobject *top_kobj; | |
374 | struct kset *kset; | |
7eff2e7a | 375 | struct kobj_uevent_env *env = NULL; |
16574dcc KS |
376 | int i; |
377 | size_t count = 0; | |
378 | int retval; | |
379 | ||
380 | /* search the kset, the device belongs to */ | |
381 | top_kobj = &dev->kobj; | |
5c5daf65 KS |
382 | while (!top_kobj->kset && top_kobj->parent) |
383 | top_kobj = top_kobj->parent; | |
16574dcc KS |
384 | if (!top_kobj->kset) |
385 | goto out; | |
5c5daf65 | 386 | |
16574dcc KS |
387 | kset = top_kobj->kset; |
388 | if (!kset->uevent_ops || !kset->uevent_ops->uevent) | |
389 | goto out; | |
390 | ||
391 | /* respect filter */ | |
392 | if (kset->uevent_ops && kset->uevent_ops->filter) | |
393 | if (!kset->uevent_ops->filter(kset, &dev->kobj)) | |
394 | goto out; | |
395 | ||
7eff2e7a KS |
396 | env = kzalloc(sizeof(struct kobj_uevent_env), GFP_KERNEL); |
397 | if (!env) | |
c7308c81 GKH |
398 | return -ENOMEM; |
399 | ||
16574dcc | 400 | /* let the kset specific function add its keys */ |
7eff2e7a | 401 | retval = kset->uevent_ops->uevent(kset, &dev->kobj, env); |
16574dcc KS |
402 | if (retval) |
403 | goto out; | |
404 | ||
405 | /* copy keys to file */ | |
7eff2e7a KS |
406 | for (i = 0; i < env->envp_idx; i++) |
407 | count += sprintf(&buf[count], "%s\n", env->envp[i]); | |
16574dcc | 408 | out: |
7eff2e7a | 409 | kfree(env); |
16574dcc KS |
410 | return count; |
411 | } | |
412 | ||
c5e064a6 | 413 | static ssize_t uevent_store(struct device *dev, struct device_attribute *attr, |
a7fd6706 KS |
414 | const char *buf, size_t count) |
415 | { | |
60a96a59 KS |
416 | enum kobject_action action; |
417 | ||
3f5468c9 | 418 | if (kobject_action_type(buf, count, &action) == 0) |
60a96a59 | 419 | kobject_uevent(&dev->kobj, action); |
3f5468c9 KS |
420 | else |
421 | dev_err(dev, "uevent: unknown action-string\n"); | |
a7fd6706 KS |
422 | return count; |
423 | } | |
c5e064a6 | 424 | static DEVICE_ATTR_RW(uevent); |
a7fd6706 | 425 | |
c5e064a6 | 426 | static ssize_t online_show(struct device *dev, struct device_attribute *attr, |
4f3549d7 RW |
427 | char *buf) |
428 | { | |
429 | bool val; | |
430 | ||
5e33bc41 | 431 | device_lock(dev); |
4f3549d7 | 432 | val = !dev->offline; |
5e33bc41 | 433 | device_unlock(dev); |
4f3549d7 RW |
434 | return sprintf(buf, "%u\n", val); |
435 | } | |
436 | ||
c5e064a6 | 437 | static ssize_t online_store(struct device *dev, struct device_attribute *attr, |
4f3549d7 RW |
438 | const char *buf, size_t count) |
439 | { | |
440 | bool val; | |
441 | int ret; | |
442 | ||
443 | ret = strtobool(buf, &val); | |
444 | if (ret < 0) | |
445 | return ret; | |
446 | ||
5e33bc41 RW |
447 | ret = lock_device_hotplug_sysfs(); |
448 | if (ret) | |
449 | return ret; | |
450 | ||
4f3549d7 RW |
451 | ret = val ? device_online(dev) : device_offline(dev); |
452 | unlock_device_hotplug(); | |
453 | return ret < 0 ? ret : count; | |
454 | } | |
c5e064a6 | 455 | static DEVICE_ATTR_RW(online); |
4f3549d7 | 456 | |
fa6fdb33 | 457 | int device_add_groups(struct device *dev, const struct attribute_group **groups) |
621a1672 | 458 | { |
3e9b2bae | 459 | return sysfs_create_groups(&dev->kobj, groups); |
de0ff00d GKH |
460 | } |
461 | ||
fa6fdb33 GKH |
462 | void device_remove_groups(struct device *dev, |
463 | const struct attribute_group **groups) | |
de0ff00d | 464 | { |
3e9b2bae | 465 | sysfs_remove_groups(&dev->kobj, groups); |
de0ff00d GKH |
466 | } |
467 | ||
2620efef GKH |
468 | static int device_add_attrs(struct device *dev) |
469 | { | |
470 | struct class *class = dev->class; | |
aed65af1 | 471 | const struct device_type *type = dev->type; |
621a1672 | 472 | int error; |
2620efef | 473 | |
621a1672 | 474 | if (class) { |
d05a6f96 | 475 | error = device_add_groups(dev, class->dev_groups); |
f9f852df | 476 | if (error) |
621a1672 | 477 | return error; |
2620efef | 478 | } |
f9f852df | 479 | |
621a1672 DT |
480 | if (type) { |
481 | error = device_add_groups(dev, type->groups); | |
f9f852df | 482 | if (error) |
a6b01ded | 483 | goto err_remove_class_groups; |
f9f852df KS |
484 | } |
485 | ||
621a1672 DT |
486 | error = device_add_groups(dev, dev->groups); |
487 | if (error) | |
488 | goto err_remove_type_groups; | |
489 | ||
4f3549d7 | 490 | if (device_supports_offline(dev) && !dev->offline_disabled) { |
c5e064a6 | 491 | error = device_create_file(dev, &dev_attr_online); |
4f3549d7 | 492 | if (error) |
ecfbf6fd | 493 | goto err_remove_dev_groups; |
4f3549d7 RW |
494 | } |
495 | ||
621a1672 DT |
496 | return 0; |
497 | ||
ecfbf6fd RW |
498 | err_remove_dev_groups: |
499 | device_remove_groups(dev, dev->groups); | |
621a1672 DT |
500 | err_remove_type_groups: |
501 | if (type) | |
502 | device_remove_groups(dev, type->groups); | |
d05a6f96 GKH |
503 | err_remove_class_groups: |
504 | if (class) | |
505 | device_remove_groups(dev, class->dev_groups); | |
621a1672 | 506 | |
2620efef GKH |
507 | return error; |
508 | } | |
509 | ||
510 | static void device_remove_attrs(struct device *dev) | |
511 | { | |
512 | struct class *class = dev->class; | |
aed65af1 | 513 | const struct device_type *type = dev->type; |
2620efef | 514 | |
c5e064a6 | 515 | device_remove_file(dev, &dev_attr_online); |
621a1672 | 516 | device_remove_groups(dev, dev->groups); |
f9f852df | 517 | |
621a1672 DT |
518 | if (type) |
519 | device_remove_groups(dev, type->groups); | |
520 | ||
a6b01ded | 521 | if (class) |
d05a6f96 | 522 | device_remove_groups(dev, class->dev_groups); |
2620efef GKH |
523 | } |
524 | ||
c5e064a6 | 525 | static ssize_t dev_show(struct device *dev, struct device_attribute *attr, |
23681e47 GKH |
526 | char *buf) |
527 | { | |
528 | return print_dev_t(buf, dev->devt); | |
529 | } | |
c5e064a6 | 530 | static DEVICE_ATTR_RO(dev); |
ad6a1e1c | 531 | |
ca22e56d | 532 | /* /sys/devices/ */ |
881c6cfd | 533 | struct kset *devices_kset; |
1da177e4 | 534 | |
1da177e4 | 535 | /** |
4a3ad20c GKH |
536 | * device_create_file - create sysfs attribute file for device. |
537 | * @dev: device. | |
538 | * @attr: device attribute descriptor. | |
1da177e4 | 539 | */ |
26579ab7 PC |
540 | int device_create_file(struct device *dev, |
541 | const struct device_attribute *attr) | |
1da177e4 LT |
542 | { |
543 | int error = 0; | |
8f46baaa FB |
544 | |
545 | if (dev) { | |
546 | WARN(((attr->attr.mode & S_IWUGO) && !attr->store), | |
97521978 | 547 | "Attribute %s: write permission without 'store'\n", |
548 | attr->attr.name); | |
8f46baaa | 549 | WARN(((attr->attr.mode & S_IRUGO) && !attr->show), |
97521978 | 550 | "Attribute %s: read permission without 'show'\n", |
551 | attr->attr.name); | |
1da177e4 | 552 | error = sysfs_create_file(&dev->kobj, &attr->attr); |
8f46baaa FB |
553 | } |
554 | ||
1da177e4 LT |
555 | return error; |
556 | } | |
86df2687 | 557 | EXPORT_SYMBOL_GPL(device_create_file); |
1da177e4 LT |
558 | |
559 | /** | |
4a3ad20c GKH |
560 | * device_remove_file - remove sysfs attribute file. |
561 | * @dev: device. | |
562 | * @attr: device attribute descriptor. | |
1da177e4 | 563 | */ |
26579ab7 PC |
564 | void device_remove_file(struct device *dev, |
565 | const struct device_attribute *attr) | |
1da177e4 | 566 | { |
0c98b19f | 567 | if (dev) |
1da177e4 | 568 | sysfs_remove_file(&dev->kobj, &attr->attr); |
1da177e4 | 569 | } |
86df2687 | 570 | EXPORT_SYMBOL_GPL(device_remove_file); |
1da177e4 | 571 | |
6b0afc2a TH |
572 | /** |
573 | * device_remove_file_self - remove sysfs attribute file from its own method. | |
574 | * @dev: device. | |
575 | * @attr: device attribute descriptor. | |
576 | * | |
577 | * See kernfs_remove_self() for details. | |
578 | */ | |
579 | bool device_remove_file_self(struct device *dev, | |
580 | const struct device_attribute *attr) | |
581 | { | |
582 | if (dev) | |
583 | return sysfs_remove_file_self(&dev->kobj, &attr->attr); | |
584 | else | |
585 | return false; | |
586 | } | |
587 | EXPORT_SYMBOL_GPL(device_remove_file_self); | |
588 | ||
2589f188 GKH |
589 | /** |
590 | * device_create_bin_file - create sysfs binary attribute file for device. | |
591 | * @dev: device. | |
592 | * @attr: device binary attribute descriptor. | |
593 | */ | |
66ecb92b PC |
594 | int device_create_bin_file(struct device *dev, |
595 | const struct bin_attribute *attr) | |
2589f188 GKH |
596 | { |
597 | int error = -EINVAL; | |
598 | if (dev) | |
599 | error = sysfs_create_bin_file(&dev->kobj, attr); | |
600 | return error; | |
601 | } | |
602 | EXPORT_SYMBOL_GPL(device_create_bin_file); | |
603 | ||
604 | /** | |
605 | * device_remove_bin_file - remove sysfs binary attribute file | |
606 | * @dev: device. | |
607 | * @attr: device binary attribute descriptor. | |
608 | */ | |
66ecb92b PC |
609 | void device_remove_bin_file(struct device *dev, |
610 | const struct bin_attribute *attr) | |
2589f188 GKH |
611 | { |
612 | if (dev) | |
613 | sysfs_remove_bin_file(&dev->kobj, attr); | |
614 | } | |
615 | EXPORT_SYMBOL_GPL(device_remove_bin_file); | |
616 | ||
34bb61f9 JB |
617 | static void klist_children_get(struct klist_node *n) |
618 | { | |
f791b8c8 GKH |
619 | struct device_private *p = to_device_private_parent(n); |
620 | struct device *dev = p->device; | |
34bb61f9 JB |
621 | |
622 | get_device(dev); | |
623 | } | |
624 | ||
625 | static void klist_children_put(struct klist_node *n) | |
626 | { | |
f791b8c8 GKH |
627 | struct device_private *p = to_device_private_parent(n); |
628 | struct device *dev = p->device; | |
34bb61f9 JB |
629 | |
630 | put_device(dev); | |
631 | } | |
632 | ||
1da177e4 | 633 | /** |
4a3ad20c GKH |
634 | * device_initialize - init device structure. |
635 | * @dev: device. | |
1da177e4 | 636 | * |
5739411a CH |
637 | * This prepares the device for use by other layers by initializing |
638 | * its fields. | |
4a3ad20c | 639 | * It is the first half of device_register(), if called by |
5739411a CH |
640 | * that function, though it can also be called separately, so one |
641 | * may use @dev's fields. In particular, get_device()/put_device() | |
642 | * may be used for reference counting of @dev after calling this | |
643 | * function. | |
644 | * | |
b10d5efd AS |
645 | * All fields in @dev must be initialized by the caller to 0, except |
646 | * for those explicitly set to some other value. The simplest | |
647 | * approach is to use kzalloc() to allocate the structure containing | |
648 | * @dev. | |
649 | * | |
5739411a CH |
650 | * NOTE: Use put_device() to give up your reference instead of freeing |
651 | * @dev directly once you have called this function. | |
1da177e4 | 652 | */ |
1da177e4 LT |
653 | void device_initialize(struct device *dev) |
654 | { | |
881c6cfd | 655 | dev->kobj.kset = devices_kset; |
f9cb074b | 656 | kobject_init(&dev->kobj, &device_ktype); |
1da177e4 | 657 | INIT_LIST_HEAD(&dev->dma_pools); |
3142788b | 658 | mutex_init(&dev->mutex); |
1704f47b | 659 | lockdep_set_novalidate_class(&dev->mutex); |
9ac7849e TH |
660 | spin_lock_init(&dev->devres_lock); |
661 | INIT_LIST_HEAD(&dev->devres_head); | |
3b98aeaf | 662 | device_pm_init(dev); |
87348136 | 663 | set_dev_node(dev, -1); |
1da177e4 | 664 | } |
86df2687 | 665 | EXPORT_SYMBOL_GPL(device_initialize); |
1da177e4 | 666 | |
d73ce004 | 667 | struct kobject *virtual_device_parent(struct device *dev) |
f0ee61a6 | 668 | { |
86406245 | 669 | static struct kobject *virtual_dir = NULL; |
f0ee61a6 | 670 | |
86406245 | 671 | if (!virtual_dir) |
4ff6abff | 672 | virtual_dir = kobject_create_and_add("virtual", |
881c6cfd | 673 | &devices_kset->kobj); |
f0ee61a6 | 674 | |
86406245 | 675 | return virtual_dir; |
f0ee61a6 GKH |
676 | } |
677 | ||
bc451f20 EB |
678 | struct class_dir { |
679 | struct kobject kobj; | |
680 | struct class *class; | |
681 | }; | |
682 | ||
683 | #define to_class_dir(obj) container_of(obj, struct class_dir, kobj) | |
684 | ||
685 | static void class_dir_release(struct kobject *kobj) | |
686 | { | |
687 | struct class_dir *dir = to_class_dir(kobj); | |
688 | kfree(dir); | |
689 | } | |
690 | ||
691 | static const | |
692 | struct kobj_ns_type_operations *class_dir_child_ns_type(struct kobject *kobj) | |
40fa5422 | 693 | { |
bc451f20 EB |
694 | struct class_dir *dir = to_class_dir(kobj); |
695 | return dir->class->ns_type; | |
696 | } | |
697 | ||
698 | static struct kobj_type class_dir_ktype = { | |
699 | .release = class_dir_release, | |
700 | .sysfs_ops = &kobj_sysfs_ops, | |
701 | .child_ns_type = class_dir_child_ns_type | |
702 | }; | |
703 | ||
704 | static struct kobject * | |
705 | class_dir_create_and_add(struct class *class, struct kobject *parent_kobj) | |
706 | { | |
707 | struct class_dir *dir; | |
43968d2f GKH |
708 | int retval; |
709 | ||
bc451f20 EB |
710 | dir = kzalloc(sizeof(*dir), GFP_KERNEL); |
711 | if (!dir) | |
712 | return NULL; | |
713 | ||
714 | dir->class = class; | |
715 | kobject_init(&dir->kobj, &class_dir_ktype); | |
716 | ||
6b6e39a6 | 717 | dir->kobj.kset = &class->p->glue_dirs; |
bc451f20 EB |
718 | |
719 | retval = kobject_add(&dir->kobj, parent_kobj, "%s", class->name); | |
720 | if (retval < 0) { | |
721 | kobject_put(&dir->kobj); | |
722 | return NULL; | |
723 | } | |
724 | return &dir->kobj; | |
725 | } | |
726 | ||
e4a60d13 | 727 | static DEFINE_MUTEX(gdp_mutex); |
bc451f20 EB |
728 | |
729 | static struct kobject *get_device_parent(struct device *dev, | |
730 | struct device *parent) | |
731 | { | |
86406245 KS |
732 | if (dev->class) { |
733 | struct kobject *kobj = NULL; | |
734 | struct kobject *parent_kobj; | |
735 | struct kobject *k; | |
736 | ||
ead454fe | 737 | #ifdef CONFIG_BLOCK |
39aba963 | 738 | /* block disks show up in /sys/block */ |
e52eec13 | 739 | if (sysfs_deprecated && dev->class == &block_class) { |
39aba963 KS |
740 | if (parent && parent->class == &block_class) |
741 | return &parent->kobj; | |
6b6e39a6 | 742 | return &block_class.p->subsys.kobj; |
39aba963 | 743 | } |
ead454fe | 744 | #endif |
e52eec13 | 745 | |
86406245 KS |
746 | /* |
747 | * If we have no parent, we live in "virtual". | |
0f4dafc0 KS |
748 | * Class-devices with a non class-device as parent, live |
749 | * in a "glue" directory to prevent namespace collisions. | |
86406245 KS |
750 | */ |
751 | if (parent == NULL) | |
752 | parent_kobj = virtual_device_parent(dev); | |
24b1442d | 753 | else if (parent->class && !dev->class->ns_type) |
86406245 KS |
754 | return &parent->kobj; |
755 | else | |
756 | parent_kobj = &parent->kobj; | |
757 | ||
77d3d7c1 TH |
758 | mutex_lock(&gdp_mutex); |
759 | ||
86406245 | 760 | /* find our class-directory at the parent and reference it */ |
6b6e39a6 KS |
761 | spin_lock(&dev->class->p->glue_dirs.list_lock); |
762 | list_for_each_entry(k, &dev->class->p->glue_dirs.list, entry) | |
86406245 KS |
763 | if (k->parent == parent_kobj) { |
764 | kobj = kobject_get(k); | |
765 | break; | |
766 | } | |
6b6e39a6 | 767 | spin_unlock(&dev->class->p->glue_dirs.list_lock); |
77d3d7c1 TH |
768 | if (kobj) { |
769 | mutex_unlock(&gdp_mutex); | |
86406245 | 770 | return kobj; |
77d3d7c1 | 771 | } |
86406245 KS |
772 | |
773 | /* or create a new class-directory at the parent device */ | |
bc451f20 | 774 | k = class_dir_create_and_add(dev->class, parent_kobj); |
0f4dafc0 | 775 | /* do not emit an uevent for this simple "glue" directory */ |
77d3d7c1 | 776 | mutex_unlock(&gdp_mutex); |
43968d2f | 777 | return k; |
86406245 KS |
778 | } |
779 | ||
ca22e56d KS |
780 | /* subsystems can specify a default root directory for their devices */ |
781 | if (!parent && dev->bus && dev->bus->dev_root) | |
782 | return &dev->bus->dev_root->kobj; | |
783 | ||
86406245 | 784 | if (parent) |
c744aeae CH |
785 | return &parent->kobj; |
786 | return NULL; | |
787 | } | |
da231fd5 | 788 | |
63b6971a | 789 | static void cleanup_glue_dir(struct device *dev, struct kobject *glue_dir) |
da231fd5 | 790 | { |
0f4dafc0 | 791 | /* see if we live in a "glue" directory */ |
c1fe539a | 792 | if (!glue_dir || !dev->class || |
6b6e39a6 | 793 | glue_dir->kset != &dev->class->p->glue_dirs) |
da231fd5 KS |
794 | return; |
795 | ||
e4a60d13 | 796 | mutex_lock(&gdp_mutex); |
0f4dafc0 | 797 | kobject_put(glue_dir); |
e4a60d13 | 798 | mutex_unlock(&gdp_mutex); |
da231fd5 | 799 | } |
63b6971a CH |
800 | |
801 | static void cleanup_device_parent(struct device *dev) | |
802 | { | |
803 | cleanup_glue_dir(dev, dev->kobj.parent); | |
804 | } | |
86406245 | 805 | |
2ee97caf CH |
806 | static int device_add_class_symlinks(struct device *dev) |
807 | { | |
808 | int error; | |
809 | ||
810 | if (!dev->class) | |
811 | return 0; | |
da231fd5 | 812 | |
1fbfee6c | 813 | error = sysfs_create_link(&dev->kobj, |
6b6e39a6 | 814 | &dev->class->p->subsys.kobj, |
2ee97caf CH |
815 | "subsystem"); |
816 | if (error) | |
817 | goto out; | |
da231fd5 | 818 | |
4e886c29 | 819 | if (dev->parent && device_is_not_partition(dev)) { |
39aba963 | 820 | error = sysfs_create_link(&dev->kobj, &dev->parent->kobj, |
4f01a757 DT |
821 | "device"); |
822 | if (error) | |
39aba963 | 823 | goto out_subsys; |
2ee97caf | 824 | } |
2ee97caf | 825 | |
ead454fe | 826 | #ifdef CONFIG_BLOCK |
39aba963 | 827 | /* /sys/block has directories and does not need symlinks */ |
e52eec13 | 828 | if (sysfs_deprecated && dev->class == &block_class) |
39aba963 | 829 | return 0; |
ead454fe | 830 | #endif |
39aba963 | 831 | |
da231fd5 | 832 | /* link in the class directory pointing to the device */ |
6b6e39a6 | 833 | error = sysfs_create_link(&dev->class->p->subsys.kobj, |
1e0b2cf9 | 834 | &dev->kobj, dev_name(dev)); |
da231fd5 | 835 | if (error) |
39aba963 | 836 | goto out_device; |
da231fd5 | 837 | |
da231fd5 KS |
838 | return 0; |
839 | ||
39aba963 KS |
840 | out_device: |
841 | sysfs_remove_link(&dev->kobj, "device"); | |
da231fd5 | 842 | |
2ee97caf CH |
843 | out_subsys: |
844 | sysfs_remove_link(&dev->kobj, "subsystem"); | |
845 | out: | |
846 | return error; | |
847 | } | |
848 | ||
849 | static void device_remove_class_symlinks(struct device *dev) | |
850 | { | |
851 | if (!dev->class) | |
852 | return; | |
da231fd5 | 853 | |
4e886c29 | 854 | if (dev->parent && device_is_not_partition(dev)) |
da231fd5 | 855 | sysfs_remove_link(&dev->kobj, "device"); |
2ee97caf | 856 | sysfs_remove_link(&dev->kobj, "subsystem"); |
ead454fe | 857 | #ifdef CONFIG_BLOCK |
e52eec13 | 858 | if (sysfs_deprecated && dev->class == &block_class) |
39aba963 | 859 | return; |
ead454fe | 860 | #endif |
6b6e39a6 | 861 | sysfs_delete_link(&dev->class->p->subsys.kobj, &dev->kobj, dev_name(dev)); |
2ee97caf CH |
862 | } |
863 | ||
413c239f SR |
864 | /** |
865 | * dev_set_name - set a device name | |
866 | * @dev: device | |
46232366 | 867 | * @fmt: format string for the device's name |
413c239f SR |
868 | */ |
869 | int dev_set_name(struct device *dev, const char *fmt, ...) | |
870 | { | |
871 | va_list vargs; | |
1fa5ae85 | 872 | int err; |
413c239f SR |
873 | |
874 | va_start(vargs, fmt); | |
1fa5ae85 | 875 | err = kobject_set_name_vargs(&dev->kobj, fmt, vargs); |
413c239f | 876 | va_end(vargs); |
1fa5ae85 | 877 | return err; |
413c239f SR |
878 | } |
879 | EXPORT_SYMBOL_GPL(dev_set_name); | |
880 | ||
e105b8bf DW |
881 | /** |
882 | * device_to_dev_kobj - select a /sys/dev/ directory for the device | |
883 | * @dev: device | |
884 | * | |
885 | * By default we select char/ for new entries. Setting class->dev_obj | |
886 | * to NULL prevents an entry from being created. class->dev_kobj must | |
887 | * be set (or cleared) before any devices are registered to the class | |
888 | * otherwise device_create_sys_dev_entry() and | |
0d4e293c PK |
889 | * device_remove_sys_dev_entry() will disagree about the presence of |
890 | * the link. | |
e105b8bf DW |
891 | */ |
892 | static struct kobject *device_to_dev_kobj(struct device *dev) | |
893 | { | |
894 | struct kobject *kobj; | |
895 | ||
896 | if (dev->class) | |
897 | kobj = dev->class->dev_kobj; | |
898 | else | |
899 | kobj = sysfs_dev_char_kobj; | |
900 | ||
901 | return kobj; | |
902 | } | |
903 | ||
904 | static int device_create_sys_dev_entry(struct device *dev) | |
905 | { | |
906 | struct kobject *kobj = device_to_dev_kobj(dev); | |
907 | int error = 0; | |
908 | char devt_str[15]; | |
909 | ||
910 | if (kobj) { | |
911 | format_dev_t(devt_str, dev->devt); | |
912 | error = sysfs_create_link(kobj, &dev->kobj, devt_str); | |
913 | } | |
914 | ||
915 | return error; | |
916 | } | |
917 | ||
918 | static void device_remove_sys_dev_entry(struct device *dev) | |
919 | { | |
920 | struct kobject *kobj = device_to_dev_kobj(dev); | |
921 | char devt_str[15]; | |
922 | ||
923 | if (kobj) { | |
924 | format_dev_t(devt_str, dev->devt); | |
925 | sysfs_remove_link(kobj, devt_str); | |
926 | } | |
927 | } | |
928 | ||
b4028437 GKH |
929 | int device_private_init(struct device *dev) |
930 | { | |
931 | dev->p = kzalloc(sizeof(*dev->p), GFP_KERNEL); | |
932 | if (!dev->p) | |
933 | return -ENOMEM; | |
934 | dev->p->device = dev; | |
935 | klist_init(&dev->p->klist_children, klist_children_get, | |
936 | klist_children_put); | |
ef8a3fd6 | 937 | INIT_LIST_HEAD(&dev->p->deferred_probe); |
b4028437 GKH |
938 | return 0; |
939 | } | |
940 | ||
1da177e4 | 941 | /** |
4a3ad20c GKH |
942 | * device_add - add device to device hierarchy. |
943 | * @dev: device. | |
1da177e4 | 944 | * |
4a3ad20c GKH |
945 | * This is part 2 of device_register(), though may be called |
946 | * separately _iff_ device_initialize() has been called separately. | |
1da177e4 | 947 | * |
5739411a | 948 | * This adds @dev to the kobject hierarchy via kobject_add(), adds it |
4a3ad20c GKH |
949 | * to the global and sibling lists for the device, then |
950 | * adds it to the other relevant subsystems of the driver model. | |
5739411a | 951 | * |
b10d5efd AS |
952 | * Do not call this routine or device_register() more than once for |
953 | * any device structure. The driver model core is not designed to work | |
954 | * with devices that get unregistered and then spring back to life. | |
955 | * (Among other things, it's very hard to guarantee that all references | |
956 | * to the previous incarnation of @dev have been dropped.) Allocate | |
957 | * and register a fresh new struct device instead. | |
958 | * | |
5739411a CH |
959 | * NOTE: _Never_ directly free @dev after calling this function, even |
960 | * if it returned an error! Always use put_device() to give up your | |
961 | * reference instead. | |
1da177e4 LT |
962 | */ |
963 | int device_add(struct device *dev) | |
964 | { | |
965 | struct device *parent = NULL; | |
ca22e56d | 966 | struct kobject *kobj; |
c47ed219 | 967 | struct class_interface *class_intf; |
c906a48a | 968 | int error = -EINVAL; |
775b64d2 | 969 | |
1da177e4 | 970 | dev = get_device(dev); |
c906a48a GKH |
971 | if (!dev) |
972 | goto done; | |
973 | ||
fb069a5d | 974 | if (!dev->p) { |
b4028437 GKH |
975 | error = device_private_init(dev); |
976 | if (error) | |
977 | goto done; | |
fb069a5d | 978 | } |
fb069a5d | 979 | |
1fa5ae85 KS |
980 | /* |
981 | * for statically allocated devices, which should all be converted | |
982 | * some day, we need to initialize the name. We prevent reading back | |
983 | * the name, and force the use of dev_name() | |
984 | */ | |
985 | if (dev->init_name) { | |
acc0e90f | 986 | dev_set_name(dev, "%s", dev->init_name); |
1fa5ae85 KS |
987 | dev->init_name = NULL; |
988 | } | |
c906a48a | 989 | |
ca22e56d KS |
990 | /* subsystems can specify simple device enumeration */ |
991 | if (!dev_name(dev) && dev->bus && dev->bus->dev_name) | |
992 | dev_set_name(dev, "%s%u", dev->bus->dev_name, dev->id); | |
993 | ||
e6309e75 TG |
994 | if (!dev_name(dev)) { |
995 | error = -EINVAL; | |
5c8563d7 | 996 | goto name_error; |
e6309e75 | 997 | } |
1da177e4 | 998 | |
1e0b2cf9 | 999 | pr_debug("device: '%s': %s\n", dev_name(dev), __func__); |
c205ef48 | 1000 | |
1da177e4 | 1001 | parent = get_device(dev->parent); |
ca22e56d KS |
1002 | kobj = get_device_parent(dev, parent); |
1003 | if (kobj) | |
1004 | dev->kobj.parent = kobj; | |
1da177e4 | 1005 | |
0d358f22 YL |
1006 | /* use parent numa_node */ |
1007 | if (parent) | |
1008 | set_dev_node(dev, dev_to_node(parent)); | |
1009 | ||
1da177e4 | 1010 | /* first, register with generic layer. */ |
8a577ffc KS |
1011 | /* we require the name to be set before, and pass NULL */ |
1012 | error = kobject_add(&dev->kobj, dev->kobj.parent, NULL); | |
40fa5422 | 1013 | if (error) |
1da177e4 | 1014 | goto Error; |
a7fd6706 | 1015 | |
37022644 BW |
1016 | /* notify platform of device entry */ |
1017 | if (platform_notify) | |
1018 | platform_notify(dev); | |
1019 | ||
c5e064a6 | 1020 | error = device_create_file(dev, &dev_attr_uevent); |
a306eea4 CH |
1021 | if (error) |
1022 | goto attrError; | |
a7fd6706 | 1023 | |
23681e47 | 1024 | if (MAJOR(dev->devt)) { |
c5e064a6 | 1025 | error = device_create_file(dev, &dev_attr_dev); |
ad6a1e1c | 1026 | if (error) |
a306eea4 | 1027 | goto ueventattrError; |
e105b8bf DW |
1028 | |
1029 | error = device_create_sys_dev_entry(dev); | |
1030 | if (error) | |
1031 | goto devtattrError; | |
2b2af54a KS |
1032 | |
1033 | devtmpfs_create_node(dev); | |
23681e47 GKH |
1034 | } |
1035 | ||
2ee97caf CH |
1036 | error = device_add_class_symlinks(dev); |
1037 | if (error) | |
1038 | goto SymlinkError; | |
dc0afa83 CH |
1039 | error = device_add_attrs(dev); |
1040 | if (error) | |
2620efef | 1041 | goto AttrsError; |
dc0afa83 CH |
1042 | error = bus_add_device(dev); |
1043 | if (error) | |
1da177e4 | 1044 | goto BusError; |
3b98aeaf | 1045 | error = dpm_sysfs_add(dev); |
57eee3d2 | 1046 | if (error) |
3b98aeaf AS |
1047 | goto DPMError; |
1048 | device_pm_add(dev); | |
ec0676ee AS |
1049 | |
1050 | /* Notify clients of device addition. This call must come | |
268863f4 | 1051 | * after dpm_sysfs_add() and before kobject_uevent(). |
ec0676ee AS |
1052 | */ |
1053 | if (dev->bus) | |
1054 | blocking_notifier_call_chain(&dev->bus->p->bus_notifier, | |
1055 | BUS_NOTIFY_ADD_DEVICE, dev); | |
1056 | ||
83b5fb4c | 1057 | kobject_uevent(&dev->kobj, KOBJ_ADD); |
2023c610 | 1058 | bus_probe_device(dev); |
1da177e4 | 1059 | if (parent) |
f791b8c8 GKH |
1060 | klist_add_tail(&dev->p->knode_parent, |
1061 | &parent->p->klist_children); | |
1da177e4 | 1062 | |
5d9fd169 | 1063 | if (dev->class) { |
ca22e56d | 1064 | mutex_lock(&dev->class->p->mutex); |
c47ed219 | 1065 | /* tie the class to the device */ |
5a3ceb86 | 1066 | klist_add_tail(&dev->knode_class, |
6b6e39a6 | 1067 | &dev->class->p->klist_devices); |
c47ed219 GKH |
1068 | |
1069 | /* notify any interfaces that the device is here */ | |
184f1f77 | 1070 | list_for_each_entry(class_intf, |
ca22e56d | 1071 | &dev->class->p->interfaces, node) |
c47ed219 GKH |
1072 | if (class_intf->add_dev) |
1073 | class_intf->add_dev(dev, class_intf); | |
ca22e56d | 1074 | mutex_unlock(&dev->class->p->mutex); |
5d9fd169 | 1075 | } |
c906a48a | 1076 | done: |
1da177e4 LT |
1077 | put_device(dev); |
1078 | return error; | |
3b98aeaf | 1079 | DPMError: |
57eee3d2 RW |
1080 | bus_remove_device(dev); |
1081 | BusError: | |
82f0cf9b | 1082 | device_remove_attrs(dev); |
2620efef | 1083 | AttrsError: |
2ee97caf CH |
1084 | device_remove_class_symlinks(dev); |
1085 | SymlinkError: | |
ad72956d KS |
1086 | if (MAJOR(dev->devt)) |
1087 | devtmpfs_delete_node(dev); | |
e105b8bf DW |
1088 | if (MAJOR(dev->devt)) |
1089 | device_remove_sys_dev_entry(dev); | |
1090 | devtattrError: | |
ad6a1e1c | 1091 | if (MAJOR(dev->devt)) |
c5e064a6 | 1092 | device_remove_file(dev, &dev_attr_dev); |
a306eea4 | 1093 | ueventattrError: |
c5e064a6 | 1094 | device_remove_file(dev, &dev_attr_uevent); |
23681e47 | 1095 | attrError: |
312c004d | 1096 | kobject_uevent(&dev->kobj, KOBJ_REMOVE); |
1da177e4 LT |
1097 | kobject_del(&dev->kobj); |
1098 | Error: | |
63b6971a | 1099 | cleanup_device_parent(dev); |
1da177e4 LT |
1100 | if (parent) |
1101 | put_device(parent); | |
5c8563d7 KS |
1102 | name_error: |
1103 | kfree(dev->p); | |
1104 | dev->p = NULL; | |
c906a48a | 1105 | goto done; |
1da177e4 | 1106 | } |
86df2687 | 1107 | EXPORT_SYMBOL_GPL(device_add); |
1da177e4 | 1108 | |
1da177e4 | 1109 | /** |
4a3ad20c GKH |
1110 | * device_register - register a device with the system. |
1111 | * @dev: pointer to the device structure | |
1da177e4 | 1112 | * |
4a3ad20c GKH |
1113 | * This happens in two clean steps - initialize the device |
1114 | * and add it to the system. The two steps can be called | |
1115 | * separately, but this is the easiest and most common. | |
1116 | * I.e. you should only call the two helpers separately if | |
1117 | * have a clearly defined need to use and refcount the device | |
1118 | * before it is added to the hierarchy. | |
5739411a | 1119 | * |
b10d5efd AS |
1120 | * For more information, see the kerneldoc for device_initialize() |
1121 | * and device_add(). | |
1122 | * | |
5739411a CH |
1123 | * NOTE: _Never_ directly free @dev after calling this function, even |
1124 | * if it returned an error! Always use put_device() to give up the | |
1125 | * reference initialized in this function instead. | |
1da177e4 | 1126 | */ |
1da177e4 LT |
1127 | int device_register(struct device *dev) |
1128 | { | |
1129 | device_initialize(dev); | |
1130 | return device_add(dev); | |
1131 | } | |
86df2687 | 1132 | EXPORT_SYMBOL_GPL(device_register); |
1da177e4 | 1133 | |
1da177e4 | 1134 | /** |
4a3ad20c GKH |
1135 | * get_device - increment reference count for device. |
1136 | * @dev: device. | |
1da177e4 | 1137 | * |
4a3ad20c GKH |
1138 | * This simply forwards the call to kobject_get(), though |
1139 | * we do take care to provide for the case that we get a NULL | |
1140 | * pointer passed in. | |
1da177e4 | 1141 | */ |
4a3ad20c | 1142 | struct device *get_device(struct device *dev) |
1da177e4 | 1143 | { |
b0d1f807 | 1144 | return dev ? kobj_to_dev(kobject_get(&dev->kobj)) : NULL; |
1da177e4 | 1145 | } |
86df2687 | 1146 | EXPORT_SYMBOL_GPL(get_device); |
1da177e4 | 1147 | |
1da177e4 | 1148 | /** |
4a3ad20c GKH |
1149 | * put_device - decrement reference count. |
1150 | * @dev: device in question. | |
1da177e4 | 1151 | */ |
4a3ad20c | 1152 | void put_device(struct device *dev) |
1da177e4 | 1153 | { |
edfaa7c3 | 1154 | /* might_sleep(); */ |
1da177e4 LT |
1155 | if (dev) |
1156 | kobject_put(&dev->kobj); | |
1157 | } | |
86df2687 | 1158 | EXPORT_SYMBOL_GPL(put_device); |
1da177e4 | 1159 | |
1da177e4 | 1160 | /** |
4a3ad20c GKH |
1161 | * device_del - delete device from system. |
1162 | * @dev: device. | |
1da177e4 | 1163 | * |
4a3ad20c GKH |
1164 | * This is the first part of the device unregistration |
1165 | * sequence. This removes the device from the lists we control | |
1166 | * from here, has it removed from the other driver model | |
1167 | * subsystems it was added to in device_add(), and removes it | |
1168 | * from the kobject hierarchy. | |
1da177e4 | 1169 | * |
4a3ad20c GKH |
1170 | * NOTE: this should be called manually _iff_ device_add() was |
1171 | * also called manually. | |
1da177e4 | 1172 | */ |
4a3ad20c | 1173 | void device_del(struct device *dev) |
1da177e4 | 1174 | { |
4a3ad20c | 1175 | struct device *parent = dev->parent; |
c47ed219 | 1176 | struct class_interface *class_intf; |
1da177e4 | 1177 | |
ec0676ee AS |
1178 | /* Notify clients of device removal. This call must come |
1179 | * before dpm_sysfs_remove(). | |
1180 | */ | |
1181 | if (dev->bus) | |
1182 | blocking_notifier_call_chain(&dev->bus->p->bus_notifier, | |
1183 | BUS_NOTIFY_DEL_DEVICE, dev); | |
3b98aeaf | 1184 | dpm_sysfs_remove(dev); |
1da177e4 | 1185 | if (parent) |
f791b8c8 | 1186 | klist_del(&dev->p->knode_parent); |
e105b8bf | 1187 | if (MAJOR(dev->devt)) { |
2b2af54a | 1188 | devtmpfs_delete_node(dev); |
e105b8bf | 1189 | device_remove_sys_dev_entry(dev); |
c5e064a6 | 1190 | device_remove_file(dev, &dev_attr_dev); |
e105b8bf | 1191 | } |
b9d9c82b | 1192 | if (dev->class) { |
da231fd5 | 1193 | device_remove_class_symlinks(dev); |
99ef3ef8 | 1194 | |
ca22e56d | 1195 | mutex_lock(&dev->class->p->mutex); |
c47ed219 | 1196 | /* notify any interfaces that the device is now gone */ |
184f1f77 | 1197 | list_for_each_entry(class_intf, |
ca22e56d | 1198 | &dev->class->p->interfaces, node) |
c47ed219 GKH |
1199 | if (class_intf->remove_dev) |
1200 | class_intf->remove_dev(dev, class_intf); | |
1201 | /* remove the device from the class list */ | |
5a3ceb86 | 1202 | klist_del(&dev->knode_class); |
ca22e56d | 1203 | mutex_unlock(&dev->class->p->mutex); |
b9d9c82b | 1204 | } |
c5e064a6 | 1205 | device_remove_file(dev, &dev_attr_uevent); |
2620efef | 1206 | device_remove_attrs(dev); |
28953533 | 1207 | bus_remove_device(dev); |
4b6d1f12 | 1208 | device_pm_remove(dev); |
d1c3414c | 1209 | driver_deferred_probe_del(dev); |
1da177e4 LT |
1210 | |
1211 | /* Notify the platform of the removal, in case they | |
1212 | * need to do anything... | |
1213 | */ | |
1214 | if (platform_notify_remove) | |
1215 | platform_notify_remove(dev); | |
599bad38 JR |
1216 | if (dev->bus) |
1217 | blocking_notifier_call_chain(&dev->bus->p->bus_notifier, | |
1218 | BUS_NOTIFY_REMOVED_DEVICE, dev); | |
312c004d | 1219 | kobject_uevent(&dev->kobj, KOBJ_REMOVE); |
da231fd5 | 1220 | cleanup_device_parent(dev); |
1da177e4 | 1221 | kobject_del(&dev->kobj); |
da231fd5 | 1222 | put_device(parent); |
1da177e4 | 1223 | } |
86df2687 | 1224 | EXPORT_SYMBOL_GPL(device_del); |
1da177e4 LT |
1225 | |
1226 | /** | |
4a3ad20c GKH |
1227 | * device_unregister - unregister device from system. |
1228 | * @dev: device going away. | |
1da177e4 | 1229 | * |
4a3ad20c GKH |
1230 | * We do this in two parts, like we do device_register(). First, |
1231 | * we remove it from all the subsystems with device_del(), then | |
1232 | * we decrement the reference count via put_device(). If that | |
1233 | * is the final reference count, the device will be cleaned up | |
1234 | * via device_release() above. Otherwise, the structure will | |
1235 | * stick around until the final reference to the device is dropped. | |
1da177e4 | 1236 | */ |
4a3ad20c | 1237 | void device_unregister(struct device *dev) |
1da177e4 | 1238 | { |
1e0b2cf9 | 1239 | pr_debug("device: '%s': %s\n", dev_name(dev), __func__); |
1da177e4 LT |
1240 | device_del(dev); |
1241 | put_device(dev); | |
1242 | } | |
86df2687 | 1243 | EXPORT_SYMBOL_GPL(device_unregister); |
1da177e4 | 1244 | |
4a3ad20c | 1245 | static struct device *next_device(struct klist_iter *i) |
36239577 | 1246 | { |
4a3ad20c | 1247 | struct klist_node *n = klist_next(i); |
f791b8c8 GKH |
1248 | struct device *dev = NULL; |
1249 | struct device_private *p; | |
1250 | ||
1251 | if (n) { | |
1252 | p = to_device_private_parent(n); | |
1253 | dev = p->device; | |
1254 | } | |
1255 | return dev; | |
36239577 | 1256 | } |
1257 | ||
6fcf53ac | 1258 | /** |
e454cea2 | 1259 | * device_get_devnode - path of device node file |
6fcf53ac | 1260 | * @dev: device |
e454cea2 | 1261 | * @mode: returned file access mode |
3c2670e6 KS |
1262 | * @uid: returned file owner |
1263 | * @gid: returned file group | |
6fcf53ac KS |
1264 | * @tmp: possibly allocated string |
1265 | * | |
1266 | * Return the relative path of a possible device node. | |
1267 | * Non-default names may need to allocate a memory to compose | |
1268 | * a name. This memory is returned in tmp and needs to be | |
1269 | * freed by the caller. | |
1270 | */ | |
e454cea2 | 1271 | const char *device_get_devnode(struct device *dev, |
4e4098a3 | 1272 | umode_t *mode, kuid_t *uid, kgid_t *gid, |
3c2670e6 | 1273 | const char **tmp) |
6fcf53ac KS |
1274 | { |
1275 | char *s; | |
1276 | ||
1277 | *tmp = NULL; | |
1278 | ||
1279 | /* the device type may provide a specific name */ | |
e454cea2 | 1280 | if (dev->type && dev->type->devnode) |
3c2670e6 | 1281 | *tmp = dev->type->devnode(dev, mode, uid, gid); |
6fcf53ac KS |
1282 | if (*tmp) |
1283 | return *tmp; | |
1284 | ||
1285 | /* the class may provide a specific name */ | |
e454cea2 KS |
1286 | if (dev->class && dev->class->devnode) |
1287 | *tmp = dev->class->devnode(dev, mode); | |
6fcf53ac KS |
1288 | if (*tmp) |
1289 | return *tmp; | |
1290 | ||
1291 | /* return name without allocation, tmp == NULL */ | |
1292 | if (strchr(dev_name(dev), '!') == NULL) | |
1293 | return dev_name(dev); | |
1294 | ||
1295 | /* replace '!' in the name with '/' */ | |
1296 | *tmp = kstrdup(dev_name(dev), GFP_KERNEL); | |
1297 | if (!*tmp) | |
1298 | return NULL; | |
1299 | while ((s = strchr(*tmp, '!'))) | |
1300 | s[0] = '/'; | |
1301 | return *tmp; | |
1302 | } | |
1303 | ||
1da177e4 | 1304 | /** |
4a3ad20c GKH |
1305 | * device_for_each_child - device child iterator. |
1306 | * @parent: parent struct device. | |
4a3ad20c | 1307 | * @fn: function to be called for each device. |
f8878dcb | 1308 | * @data: data for the callback. |
1da177e4 | 1309 | * |
4a3ad20c GKH |
1310 | * Iterate over @parent's child devices, and call @fn for each, |
1311 | * passing it @data. | |
1da177e4 | 1312 | * |
4a3ad20c GKH |
1313 | * We check the return of @fn each time. If it returns anything |
1314 | * other than 0, we break out and return that value. | |
1da177e4 | 1315 | */ |
4a3ad20c GKH |
1316 | int device_for_each_child(struct device *parent, void *data, |
1317 | int (*fn)(struct device *dev, void *data)) | |
1da177e4 | 1318 | { |
36239577 | 1319 | struct klist_iter i; |
4a3ad20c | 1320 | struct device *child; |
1da177e4 LT |
1321 | int error = 0; |
1322 | ||
014c90db GKH |
1323 | if (!parent->p) |
1324 | return 0; | |
1325 | ||
f791b8c8 | 1326 | klist_iter_init(&parent->p->klist_children, &i); |
36239577 | 1327 | while ((child = next_device(&i)) && !error) |
1328 | error = fn(child, data); | |
1329 | klist_iter_exit(&i); | |
1da177e4 LT |
1330 | return error; |
1331 | } | |
86df2687 | 1332 | EXPORT_SYMBOL_GPL(device_for_each_child); |
1da177e4 | 1333 | |
5ab69981 CH |
1334 | /** |
1335 | * device_find_child - device iterator for locating a particular device. | |
1336 | * @parent: parent struct device | |
5ab69981 | 1337 | * @match: Callback function to check device |
f8878dcb | 1338 | * @data: Data to pass to match function |
5ab69981 CH |
1339 | * |
1340 | * This is similar to the device_for_each_child() function above, but it | |
1341 | * returns a reference to a device that is 'found' for later use, as | |
1342 | * determined by the @match callback. | |
1343 | * | |
1344 | * The callback should return 0 if the device doesn't match and non-zero | |
1345 | * if it does. If the callback returns non-zero and a reference to the | |
1346 | * current device can be obtained, this function will return to the caller | |
1347 | * and not iterate over any more devices. | |
a4e2400a FV |
1348 | * |
1349 | * NOTE: you will need to drop the reference with put_device() after use. | |
5ab69981 | 1350 | */ |
4a3ad20c GKH |
1351 | struct device *device_find_child(struct device *parent, void *data, |
1352 | int (*match)(struct device *dev, void *data)) | |
5ab69981 CH |
1353 | { |
1354 | struct klist_iter i; | |
1355 | struct device *child; | |
1356 | ||
1357 | if (!parent) | |
1358 | return NULL; | |
1359 | ||
f791b8c8 | 1360 | klist_iter_init(&parent->p->klist_children, &i); |
5ab69981 CH |
1361 | while ((child = next_device(&i))) |
1362 | if (match(child, data) && get_device(child)) | |
1363 | break; | |
1364 | klist_iter_exit(&i); | |
1365 | return child; | |
1366 | } | |
86df2687 | 1367 | EXPORT_SYMBOL_GPL(device_find_child); |
5ab69981 | 1368 | |
1da177e4 LT |
1369 | int __init devices_init(void) |
1370 | { | |
881c6cfd GKH |
1371 | devices_kset = kset_create_and_add("devices", &device_uevent_ops, NULL); |
1372 | if (!devices_kset) | |
1373 | return -ENOMEM; | |
e105b8bf DW |
1374 | dev_kobj = kobject_create_and_add("dev", NULL); |
1375 | if (!dev_kobj) | |
1376 | goto dev_kobj_err; | |
1377 | sysfs_dev_block_kobj = kobject_create_and_add("block", dev_kobj); | |
1378 | if (!sysfs_dev_block_kobj) | |
1379 | goto block_kobj_err; | |
1380 | sysfs_dev_char_kobj = kobject_create_and_add("char", dev_kobj); | |
1381 | if (!sysfs_dev_char_kobj) | |
1382 | goto char_kobj_err; | |
1383 | ||
881c6cfd | 1384 | return 0; |
e105b8bf DW |
1385 | |
1386 | char_kobj_err: | |
1387 | kobject_put(sysfs_dev_block_kobj); | |
1388 | block_kobj_err: | |
1389 | kobject_put(dev_kobj); | |
1390 | dev_kobj_err: | |
1391 | kset_unregister(devices_kset); | |
1392 | return -ENOMEM; | |
1da177e4 LT |
1393 | } |
1394 | ||
4f3549d7 RW |
1395 | static int device_check_offline(struct device *dev, void *not_used) |
1396 | { | |
1397 | int ret; | |
1398 | ||
1399 | ret = device_for_each_child(dev, NULL, device_check_offline); | |
1400 | if (ret) | |
1401 | return ret; | |
1402 | ||
1403 | return device_supports_offline(dev) && !dev->offline ? -EBUSY : 0; | |
1404 | } | |
1405 | ||
1406 | /** | |
1407 | * device_offline - Prepare the device for hot-removal. | |
1408 | * @dev: Device to be put offline. | |
1409 | * | |
1410 | * Execute the device bus type's .offline() callback, if present, to prepare | |
1411 | * the device for a subsequent hot-removal. If that succeeds, the device must | |
1412 | * not be used until either it is removed or its bus type's .online() callback | |
1413 | * is executed. | |
1414 | * | |
1415 | * Call under device_hotplug_lock. | |
1416 | */ | |
1417 | int device_offline(struct device *dev) | |
1418 | { | |
1419 | int ret; | |
1420 | ||
1421 | if (dev->offline_disabled) | |
1422 | return -EPERM; | |
1423 | ||
1424 | ret = device_for_each_child(dev, NULL, device_check_offline); | |
1425 | if (ret) | |
1426 | return ret; | |
1427 | ||
1428 | device_lock(dev); | |
1429 | if (device_supports_offline(dev)) { | |
1430 | if (dev->offline) { | |
1431 | ret = 1; | |
1432 | } else { | |
1433 | ret = dev->bus->offline(dev); | |
1434 | if (!ret) { | |
1435 | kobject_uevent(&dev->kobj, KOBJ_OFFLINE); | |
1436 | dev->offline = true; | |
1437 | } | |
1438 | } | |
1439 | } | |
1440 | device_unlock(dev); | |
1441 | ||
1442 | return ret; | |
1443 | } | |
1444 | ||
1445 | /** | |
1446 | * device_online - Put the device back online after successful device_offline(). | |
1447 | * @dev: Device to be put back online. | |
1448 | * | |
1449 | * If device_offline() has been successfully executed for @dev, but the device | |
1450 | * has not been removed subsequently, execute its bus type's .online() callback | |
1451 | * to indicate that the device can be used again. | |
1452 | * | |
1453 | * Call under device_hotplug_lock. | |
1454 | */ | |
1455 | int device_online(struct device *dev) | |
1456 | { | |
1457 | int ret = 0; | |
1458 | ||
1459 | device_lock(dev); | |
1460 | if (device_supports_offline(dev)) { | |
1461 | if (dev->offline) { | |
1462 | ret = dev->bus->online(dev); | |
1463 | if (!ret) { | |
1464 | kobject_uevent(&dev->kobj, KOBJ_ONLINE); | |
1465 | dev->offline = false; | |
1466 | } | |
1467 | } else { | |
1468 | ret = 1; | |
1469 | } | |
1470 | } | |
1471 | device_unlock(dev); | |
1472 | ||
1473 | return ret; | |
1474 | } | |
1475 | ||
7f100d15 | 1476 | struct root_device { |
0aa0dc41 MM |
1477 | struct device dev; |
1478 | struct module *owner; | |
1479 | }; | |
1480 | ||
93058424 | 1481 | static inline struct root_device *to_root_device(struct device *d) |
481e2079 FW |
1482 | { |
1483 | return container_of(d, struct root_device, dev); | |
1484 | } | |
0aa0dc41 MM |
1485 | |
1486 | static void root_device_release(struct device *dev) | |
1487 | { | |
1488 | kfree(to_root_device(dev)); | |
1489 | } | |
1490 | ||
1491 | /** | |
1492 | * __root_device_register - allocate and register a root device | |
1493 | * @name: root device name | |
1494 | * @owner: owner module of the root device, usually THIS_MODULE | |
1495 | * | |
1496 | * This function allocates a root device and registers it | |
1497 | * using device_register(). In order to free the returned | |
1498 | * device, use root_device_unregister(). | |
1499 | * | |
1500 | * Root devices are dummy devices which allow other devices | |
1501 | * to be grouped under /sys/devices. Use this function to | |
1502 | * allocate a root device and then use it as the parent of | |
1503 | * any device which should appear under /sys/devices/{name} | |
1504 | * | |
1505 | * The /sys/devices/{name} directory will also contain a | |
1506 | * 'module' symlink which points to the @owner directory | |
1507 | * in sysfs. | |
1508 | * | |
f0eae0ed JN |
1509 | * Returns &struct device pointer on success, or ERR_PTR() on error. |
1510 | * | |
0aa0dc41 MM |
1511 | * Note: You probably want to use root_device_register(). |
1512 | */ | |
1513 | struct device *__root_device_register(const char *name, struct module *owner) | |
1514 | { | |
1515 | struct root_device *root; | |
1516 | int err = -ENOMEM; | |
1517 | ||
1518 | root = kzalloc(sizeof(struct root_device), GFP_KERNEL); | |
1519 | if (!root) | |
1520 | return ERR_PTR(err); | |
1521 | ||
acc0e90f | 1522 | err = dev_set_name(&root->dev, "%s", name); |
0aa0dc41 MM |
1523 | if (err) { |
1524 | kfree(root); | |
1525 | return ERR_PTR(err); | |
1526 | } | |
1527 | ||
1528 | root->dev.release = root_device_release; | |
1529 | ||
1530 | err = device_register(&root->dev); | |
1531 | if (err) { | |
1532 | put_device(&root->dev); | |
1533 | return ERR_PTR(err); | |
1534 | } | |
1535 | ||
1d9e882b | 1536 | #ifdef CONFIG_MODULES /* gotta find a "cleaner" way to do this */ |
0aa0dc41 MM |
1537 | if (owner) { |
1538 | struct module_kobject *mk = &owner->mkobj; | |
1539 | ||
1540 | err = sysfs_create_link(&root->dev.kobj, &mk->kobj, "module"); | |
1541 | if (err) { | |
1542 | device_unregister(&root->dev); | |
1543 | return ERR_PTR(err); | |
1544 | } | |
1545 | root->owner = owner; | |
1546 | } | |
1547 | #endif | |
1548 | ||
1549 | return &root->dev; | |
1550 | } | |
1551 | EXPORT_SYMBOL_GPL(__root_device_register); | |
1552 | ||
1553 | /** | |
1554 | * root_device_unregister - unregister and free a root device | |
7cbcf225 | 1555 | * @dev: device going away |
0aa0dc41 MM |
1556 | * |
1557 | * This function unregisters and cleans up a device that was created by | |
1558 | * root_device_register(). | |
1559 | */ | |
1560 | void root_device_unregister(struct device *dev) | |
1561 | { | |
1562 | struct root_device *root = to_root_device(dev); | |
1563 | ||
1564 | if (root->owner) | |
1565 | sysfs_remove_link(&root->dev.kobj, "module"); | |
1566 | ||
1567 | device_unregister(dev); | |
1568 | } | |
1569 | EXPORT_SYMBOL_GPL(root_device_unregister); | |
1570 | ||
23681e47 GKH |
1571 | |
1572 | static void device_create_release(struct device *dev) | |
1573 | { | |
1e0b2cf9 | 1574 | pr_debug("device: '%s': %s\n", dev_name(dev), __func__); |
23681e47 GKH |
1575 | kfree(dev); |
1576 | } | |
1577 | ||
39ef3112 GR |
1578 | static struct device * |
1579 | device_create_groups_vargs(struct class *class, struct device *parent, | |
1580 | dev_t devt, void *drvdata, | |
1581 | const struct attribute_group **groups, | |
1582 | const char *fmt, va_list args) | |
23681e47 | 1583 | { |
23681e47 GKH |
1584 | struct device *dev = NULL; |
1585 | int retval = -ENODEV; | |
1586 | ||
1587 | if (class == NULL || IS_ERR(class)) | |
1588 | goto error; | |
23681e47 GKH |
1589 | |
1590 | dev = kzalloc(sizeof(*dev), GFP_KERNEL); | |
1591 | if (!dev) { | |
1592 | retval = -ENOMEM; | |
1593 | goto error; | |
1594 | } | |
1595 | ||
bbc780f8 | 1596 | device_initialize(dev); |
23681e47 GKH |
1597 | dev->devt = devt; |
1598 | dev->class = class; | |
1599 | dev->parent = parent; | |
39ef3112 | 1600 | dev->groups = groups; |
23681e47 | 1601 | dev->release = device_create_release; |
8882b394 | 1602 | dev_set_drvdata(dev, drvdata); |
23681e47 | 1603 | |
1fa5ae85 KS |
1604 | retval = kobject_set_name_vargs(&dev->kobj, fmt, args); |
1605 | if (retval) | |
1606 | goto error; | |
1607 | ||
bbc780f8 | 1608 | retval = device_add(dev); |
23681e47 GKH |
1609 | if (retval) |
1610 | goto error; | |
1611 | ||
23681e47 GKH |
1612 | return dev; |
1613 | ||
1614 | error: | |
286661b3 | 1615 | put_device(dev); |
23681e47 GKH |
1616 | return ERR_PTR(retval); |
1617 | } | |
39ef3112 GR |
1618 | |
1619 | /** | |
1620 | * device_create_vargs - creates a device and registers it with sysfs | |
1621 | * @class: pointer to the struct class that this device should be registered to | |
1622 | * @parent: pointer to the parent struct device of this new device, if any | |
1623 | * @devt: the dev_t for the char device to be added | |
1624 | * @drvdata: the data to be added to the device for callbacks | |
1625 | * @fmt: string for the device's name | |
1626 | * @args: va_list for the device's name | |
1627 | * | |
1628 | * This function can be used by char device classes. A struct device | |
1629 | * will be created in sysfs, registered to the specified class. | |
1630 | * | |
1631 | * A "dev" file will be created, showing the dev_t for the device, if | |
1632 | * the dev_t is not 0,0. | |
1633 | * If a pointer to a parent struct device is passed in, the newly created | |
1634 | * struct device will be a child of that device in sysfs. | |
1635 | * The pointer to the struct device will be returned from the call. | |
1636 | * Any further sysfs files that might be required can be created using this | |
1637 | * pointer. | |
1638 | * | |
1639 | * Returns &struct device pointer on success, or ERR_PTR() on error. | |
1640 | * | |
1641 | * Note: the struct class passed to this function must have previously | |
1642 | * been created with a call to class_create(). | |
1643 | */ | |
1644 | struct device *device_create_vargs(struct class *class, struct device *parent, | |
1645 | dev_t devt, void *drvdata, const char *fmt, | |
1646 | va_list args) | |
1647 | { | |
1648 | return device_create_groups_vargs(class, parent, devt, drvdata, NULL, | |
1649 | fmt, args); | |
1650 | } | |
8882b394 GKH |
1651 | EXPORT_SYMBOL_GPL(device_create_vargs); |
1652 | ||
1653 | /** | |
4e106739 | 1654 | * device_create - creates a device and registers it with sysfs |
8882b394 GKH |
1655 | * @class: pointer to the struct class that this device should be registered to |
1656 | * @parent: pointer to the parent struct device of this new device, if any | |
1657 | * @devt: the dev_t for the char device to be added | |
1658 | * @drvdata: the data to be added to the device for callbacks | |
1659 | * @fmt: string for the device's name | |
1660 | * | |
1661 | * This function can be used by char device classes. A struct device | |
1662 | * will be created in sysfs, registered to the specified class. | |
1663 | * | |
1664 | * A "dev" file will be created, showing the dev_t for the device, if | |
1665 | * the dev_t is not 0,0. | |
1666 | * If a pointer to a parent struct device is passed in, the newly created | |
1667 | * struct device will be a child of that device in sysfs. | |
1668 | * The pointer to the struct device will be returned from the call. | |
1669 | * Any further sysfs files that might be required can be created using this | |
1670 | * pointer. | |
1671 | * | |
f0eae0ed JN |
1672 | * Returns &struct device pointer on success, or ERR_PTR() on error. |
1673 | * | |
8882b394 GKH |
1674 | * Note: the struct class passed to this function must have previously |
1675 | * been created with a call to class_create(). | |
1676 | */ | |
4e106739 GKH |
1677 | struct device *device_create(struct class *class, struct device *parent, |
1678 | dev_t devt, void *drvdata, const char *fmt, ...) | |
8882b394 GKH |
1679 | { |
1680 | va_list vargs; | |
1681 | struct device *dev; | |
1682 | ||
1683 | va_start(vargs, fmt); | |
1684 | dev = device_create_vargs(class, parent, devt, drvdata, fmt, vargs); | |
1685 | va_end(vargs); | |
1686 | return dev; | |
1687 | } | |
4e106739 | 1688 | EXPORT_SYMBOL_GPL(device_create); |
8882b394 | 1689 | |
39ef3112 GR |
1690 | /** |
1691 | * device_create_with_groups - creates a device and registers it with sysfs | |
1692 | * @class: pointer to the struct class that this device should be registered to | |
1693 | * @parent: pointer to the parent struct device of this new device, if any | |
1694 | * @devt: the dev_t for the char device to be added | |
1695 | * @drvdata: the data to be added to the device for callbacks | |
1696 | * @groups: NULL-terminated list of attribute groups to be created | |
1697 | * @fmt: string for the device's name | |
1698 | * | |
1699 | * This function can be used by char device classes. A struct device | |
1700 | * will be created in sysfs, registered to the specified class. | |
1701 | * Additional attributes specified in the groups parameter will also | |
1702 | * be created automatically. | |
1703 | * | |
1704 | * A "dev" file will be created, showing the dev_t for the device, if | |
1705 | * the dev_t is not 0,0. | |
1706 | * If a pointer to a parent struct device is passed in, the newly created | |
1707 | * struct device will be a child of that device in sysfs. | |
1708 | * The pointer to the struct device will be returned from the call. | |
1709 | * Any further sysfs files that might be required can be created using this | |
1710 | * pointer. | |
1711 | * | |
1712 | * Returns &struct device pointer on success, or ERR_PTR() on error. | |
1713 | * | |
1714 | * Note: the struct class passed to this function must have previously | |
1715 | * been created with a call to class_create(). | |
1716 | */ | |
1717 | struct device *device_create_with_groups(struct class *class, | |
1718 | struct device *parent, dev_t devt, | |
1719 | void *drvdata, | |
1720 | const struct attribute_group **groups, | |
1721 | const char *fmt, ...) | |
1722 | { | |
1723 | va_list vargs; | |
1724 | struct device *dev; | |
1725 | ||
1726 | va_start(vargs, fmt); | |
1727 | dev = device_create_groups_vargs(class, parent, devt, drvdata, groups, | |
1728 | fmt, vargs); | |
1729 | va_end(vargs); | |
1730 | return dev; | |
1731 | } | |
1732 | EXPORT_SYMBOL_GPL(device_create_with_groups); | |
1733 | ||
9f3b795a | 1734 | static int __match_devt(struct device *dev, const void *data) |
23681e47 | 1735 | { |
9f3b795a | 1736 | const dev_t *devt = data; |
23681e47 | 1737 | |
cd35449b | 1738 | return dev->devt == *devt; |
775b64d2 RW |
1739 | } |
1740 | ||
1741 | /** | |
1742 | * device_destroy - removes a device that was created with device_create() | |
1743 | * @class: pointer to the struct class that this device was registered with | |
1744 | * @devt: the dev_t of the device that was previously registered | |
1745 | * | |
1746 | * This call unregisters and cleans up a device that was created with a | |
1747 | * call to device_create(). | |
1748 | */ | |
1749 | void device_destroy(struct class *class, dev_t devt) | |
1750 | { | |
1751 | struct device *dev; | |
23681e47 | 1752 | |
695794ae | 1753 | dev = class_find_device(class, NULL, &devt, __match_devt); |
cd35449b DY |
1754 | if (dev) { |
1755 | put_device(dev); | |
23681e47 | 1756 | device_unregister(dev); |
cd35449b | 1757 | } |
23681e47 GKH |
1758 | } |
1759 | EXPORT_SYMBOL_GPL(device_destroy); | |
a2de48ca GKH |
1760 | |
1761 | /** | |
1762 | * device_rename - renames a device | |
1763 | * @dev: the pointer to the struct device to be renamed | |
1764 | * @new_name: the new name of the device | |
030c1d2b EB |
1765 | * |
1766 | * It is the responsibility of the caller to provide mutual | |
1767 | * exclusion between two different calls of device_rename | |
1768 | * on the same device to ensure that new_name is valid and | |
1769 | * won't conflict with other devices. | |
c6c0ac66 | 1770 | * |
a5462516 TT |
1771 | * Note: Don't call this function. Currently, the networking layer calls this |
1772 | * function, but that will change. The following text from Kay Sievers offers | |
1773 | * some insight: | |
1774 | * | |
1775 | * Renaming devices is racy at many levels, symlinks and other stuff are not | |
1776 | * replaced atomically, and you get a "move" uevent, but it's not easy to | |
1777 | * connect the event to the old and new device. Device nodes are not renamed at | |
1778 | * all, there isn't even support for that in the kernel now. | |
1779 | * | |
1780 | * In the meantime, during renaming, your target name might be taken by another | |
1781 | * driver, creating conflicts. Or the old name is taken directly after you | |
1782 | * renamed it -- then you get events for the same DEVPATH, before you even see | |
1783 | * the "move" event. It's just a mess, and nothing new should ever rely on | |
1784 | * kernel device renaming. Besides that, it's not even implemented now for | |
1785 | * other things than (driver-core wise very simple) network devices. | |
1786 | * | |
1787 | * We are currently about to change network renaming in udev to completely | |
1788 | * disallow renaming of devices in the same namespace as the kernel uses, | |
1789 | * because we can't solve the problems properly, that arise with swapping names | |
1790 | * of multiple interfaces without races. Means, renaming of eth[0-9]* will only | |
1791 | * be allowed to some other name than eth[0-9]*, for the aforementioned | |
1792 | * reasons. | |
1793 | * | |
1794 | * Make up a "real" name in the driver before you register anything, or add | |
1795 | * some other attributes for userspace to find the device, or use udev to add | |
1796 | * symlinks -- but never rename kernel devices later, it's a complete mess. We | |
1797 | * don't even want to get into that and try to implement the missing pieces in | |
1798 | * the core. We really have other pieces to fix in the driver core mess. :) | |
a2de48ca | 1799 | */ |
6937e8f8 | 1800 | int device_rename(struct device *dev, const char *new_name) |
a2de48ca | 1801 | { |
4b30ee58 | 1802 | struct kobject *kobj = &dev->kobj; |
2ee97caf | 1803 | char *old_device_name = NULL; |
a2de48ca GKH |
1804 | int error; |
1805 | ||
1806 | dev = get_device(dev); | |
1807 | if (!dev) | |
1808 | return -EINVAL; | |
1809 | ||
69df7533 | 1810 | dev_dbg(dev, "renaming to %s\n", new_name); |
a2de48ca | 1811 | |
1fa5ae85 | 1812 | old_device_name = kstrdup(dev_name(dev), GFP_KERNEL); |
2ee97caf CH |
1813 | if (!old_device_name) { |
1814 | error = -ENOMEM; | |
1815 | goto out; | |
a2de48ca | 1816 | } |
a2de48ca | 1817 | |
f349cf34 | 1818 | if (dev->class) { |
4b30ee58 TH |
1819 | error = sysfs_rename_link_ns(&dev->class->p->subsys.kobj, |
1820 | kobj, old_device_name, | |
1821 | new_name, kobject_namespace(kobj)); | |
f349cf34 EB |
1822 | if (error) |
1823 | goto out; | |
1824 | } | |
39aba963 | 1825 | |
4b30ee58 | 1826 | error = kobject_rename(kobj, new_name); |
1fa5ae85 | 1827 | if (error) |
2ee97caf | 1828 | goto out; |
a2de48ca | 1829 | |
2ee97caf | 1830 | out: |
a2de48ca GKH |
1831 | put_device(dev); |
1832 | ||
2ee97caf | 1833 | kfree(old_device_name); |
a2de48ca GKH |
1834 | |
1835 | return error; | |
1836 | } | |
a2807dbc | 1837 | EXPORT_SYMBOL_GPL(device_rename); |
8a82472f CH |
1838 | |
1839 | static int device_move_class_links(struct device *dev, | |
1840 | struct device *old_parent, | |
1841 | struct device *new_parent) | |
1842 | { | |
f7f3461d | 1843 | int error = 0; |
8a82472f | 1844 | |
f7f3461d GKH |
1845 | if (old_parent) |
1846 | sysfs_remove_link(&dev->kobj, "device"); | |
1847 | if (new_parent) | |
1848 | error = sysfs_create_link(&dev->kobj, &new_parent->kobj, | |
1849 | "device"); | |
1850 | return error; | |
8a82472f CH |
1851 | } |
1852 | ||
1853 | /** | |
1854 | * device_move - moves a device to a new parent | |
1855 | * @dev: the pointer to the struct device to be moved | |
c744aeae | 1856 | * @new_parent: the new parent of the device (can by NULL) |
ffa6a705 | 1857 | * @dpm_order: how to reorder the dpm_list |
8a82472f | 1858 | */ |
ffa6a705 CH |
1859 | int device_move(struct device *dev, struct device *new_parent, |
1860 | enum dpm_order dpm_order) | |
8a82472f CH |
1861 | { |
1862 | int error; | |
1863 | struct device *old_parent; | |
c744aeae | 1864 | struct kobject *new_parent_kobj; |
8a82472f CH |
1865 | |
1866 | dev = get_device(dev); | |
1867 | if (!dev) | |
1868 | return -EINVAL; | |
1869 | ||
ffa6a705 | 1870 | device_pm_lock(); |
8a82472f | 1871 | new_parent = get_device(new_parent); |
4a3ad20c | 1872 | new_parent_kobj = get_device_parent(dev, new_parent); |
63b6971a | 1873 | |
1e0b2cf9 KS |
1874 | pr_debug("device: '%s': %s: moving to '%s'\n", dev_name(dev), |
1875 | __func__, new_parent ? dev_name(new_parent) : "<NULL>"); | |
c744aeae | 1876 | error = kobject_move(&dev->kobj, new_parent_kobj); |
8a82472f | 1877 | if (error) { |
63b6971a | 1878 | cleanup_glue_dir(dev, new_parent_kobj); |
8a82472f CH |
1879 | put_device(new_parent); |
1880 | goto out; | |
1881 | } | |
1882 | old_parent = dev->parent; | |
1883 | dev->parent = new_parent; | |
1884 | if (old_parent) | |
f791b8c8 | 1885 | klist_remove(&dev->p->knode_parent); |
0d358f22 | 1886 | if (new_parent) { |
f791b8c8 GKH |
1887 | klist_add_tail(&dev->p->knode_parent, |
1888 | &new_parent->p->klist_children); | |
0d358f22 YL |
1889 | set_dev_node(dev, dev_to_node(new_parent)); |
1890 | } | |
1891 | ||
bdd4034d RV |
1892 | if (dev->class) { |
1893 | error = device_move_class_links(dev, old_parent, new_parent); | |
1894 | if (error) { | |
1895 | /* We ignore errors on cleanup since we're hosed anyway... */ | |
1896 | device_move_class_links(dev, new_parent, old_parent); | |
1897 | if (!kobject_move(&dev->kobj, &old_parent->kobj)) { | |
1898 | if (new_parent) | |
1899 | klist_remove(&dev->p->knode_parent); | |
1900 | dev->parent = old_parent; | |
1901 | if (old_parent) { | |
1902 | klist_add_tail(&dev->p->knode_parent, | |
1903 | &old_parent->p->klist_children); | |
1904 | set_dev_node(dev, dev_to_node(old_parent)); | |
1905 | } | |
0d358f22 | 1906 | } |
bdd4034d RV |
1907 | cleanup_glue_dir(dev, new_parent_kobj); |
1908 | put_device(new_parent); | |
1909 | goto out; | |
8a82472f | 1910 | } |
8a82472f | 1911 | } |
ffa6a705 CH |
1912 | switch (dpm_order) { |
1913 | case DPM_ORDER_NONE: | |
1914 | break; | |
1915 | case DPM_ORDER_DEV_AFTER_PARENT: | |
1916 | device_pm_move_after(dev, new_parent); | |
1917 | break; | |
1918 | case DPM_ORDER_PARENT_BEFORE_DEV: | |
1919 | device_pm_move_before(new_parent, dev); | |
1920 | break; | |
1921 | case DPM_ORDER_DEV_LAST: | |
1922 | device_pm_move_last(dev); | |
1923 | break; | |
1924 | } | |
bdd4034d | 1925 | |
8a82472f CH |
1926 | put_device(old_parent); |
1927 | out: | |
ffa6a705 | 1928 | device_pm_unlock(); |
8a82472f CH |
1929 | put_device(dev); |
1930 | return error; | |
1931 | } | |
8a82472f | 1932 | EXPORT_SYMBOL_GPL(device_move); |
37b0c020 GKH |
1933 | |
1934 | /** | |
1935 | * device_shutdown - call ->shutdown() on each device to shutdown. | |
1936 | */ | |
1937 | void device_shutdown(void) | |
1938 | { | |
f123db8e | 1939 | struct device *dev, *parent; |
6245838f HD |
1940 | |
1941 | spin_lock(&devices_kset->list_lock); | |
1942 | /* | |
1943 | * Walk the devices list backward, shutting down each in turn. | |
1944 | * Beware that device unplug events may also start pulling | |
1945 | * devices offline, even as the system is shutting down. | |
1946 | */ | |
1947 | while (!list_empty(&devices_kset->list)) { | |
1948 | dev = list_entry(devices_kset->list.prev, struct device, | |
1949 | kobj.entry); | |
d1c6c030 ML |
1950 | |
1951 | /* | |
1952 | * hold reference count of device's parent to | |
1953 | * prevent it from being freed because parent's | |
1954 | * lock is to be held | |
1955 | */ | |
f123db8e | 1956 | parent = get_device(dev->parent); |
6245838f HD |
1957 | get_device(dev); |
1958 | /* | |
1959 | * Make sure the device is off the kset list, in the | |
1960 | * event that dev->*->shutdown() doesn't remove it. | |
1961 | */ | |
1962 | list_del_init(&dev->kobj.entry); | |
1963 | spin_unlock(&devices_kset->list_lock); | |
fe6b91f4 | 1964 | |
d1c6c030 | 1965 | /* hold lock to avoid race with probe/release */ |
f123db8e BL |
1966 | if (parent) |
1967 | device_lock(parent); | |
d1c6c030 ML |
1968 | device_lock(dev); |
1969 | ||
fe6b91f4 AS |
1970 | /* Don't allow any more runtime suspends */ |
1971 | pm_runtime_get_noresume(dev); | |
1972 | pm_runtime_barrier(dev); | |
37b0c020 | 1973 | |
37b0c020 | 1974 | if (dev->bus && dev->bus->shutdown) { |
0246c4fa SL |
1975 | if (initcall_debug) |
1976 | dev_info(dev, "shutdown\n"); | |
37b0c020 GKH |
1977 | dev->bus->shutdown(dev); |
1978 | } else if (dev->driver && dev->driver->shutdown) { | |
0246c4fa SL |
1979 | if (initcall_debug) |
1980 | dev_info(dev, "shutdown\n"); | |
37b0c020 GKH |
1981 | dev->driver->shutdown(dev); |
1982 | } | |
d1c6c030 ML |
1983 | |
1984 | device_unlock(dev); | |
f123db8e BL |
1985 | if (parent) |
1986 | device_unlock(parent); | |
d1c6c030 | 1987 | |
6245838f | 1988 | put_device(dev); |
f123db8e | 1989 | put_device(parent); |
6245838f HD |
1990 | |
1991 | spin_lock(&devices_kset->list_lock); | |
37b0c020 | 1992 | } |
6245838f | 1993 | spin_unlock(&devices_kset->list_lock); |
37b0c020 | 1994 | } |
99bcf217 JP |
1995 | |
1996 | /* | |
1997 | * Device logging functions | |
1998 | */ | |
1999 | ||
2000 | #ifdef CONFIG_PRINTK | |
666f355f JP |
2001 | static int |
2002 | create_syslog_header(const struct device *dev, char *hdr, size_t hdrlen) | |
99bcf217 | 2003 | { |
c4e00daa | 2004 | const char *subsys; |
798efc60 | 2005 | size_t pos = 0; |
99bcf217 | 2006 | |
c4e00daa KS |
2007 | if (dev->class) |
2008 | subsys = dev->class->name; | |
2009 | else if (dev->bus) | |
2010 | subsys = dev->bus->name; | |
2011 | else | |
798efc60 | 2012 | return 0; |
c4e00daa | 2013 | |
798efc60 | 2014 | pos += snprintf(hdr + pos, hdrlen - pos, "SUBSYSTEM=%s", subsys); |
655e5b7c BH |
2015 | if (pos >= hdrlen) |
2016 | goto overflow; | |
c4e00daa KS |
2017 | |
2018 | /* | |
2019 | * Add device identifier DEVICE=: | |
2020 | * b12:8 block dev_t | |
2021 | * c127:3 char dev_t | |
2022 | * n8 netdev ifindex | |
2023 | * +sound:card0 subsystem:devname | |
2024 | */ | |
2025 | if (MAJOR(dev->devt)) { | |
2026 | char c; | |
2027 | ||
2028 | if (strcmp(subsys, "block") == 0) | |
2029 | c = 'b'; | |
2030 | else | |
2031 | c = 'c'; | |
798efc60 JP |
2032 | pos++; |
2033 | pos += snprintf(hdr + pos, hdrlen - pos, | |
2034 | "DEVICE=%c%u:%u", | |
2035 | c, MAJOR(dev->devt), MINOR(dev->devt)); | |
c4e00daa KS |
2036 | } else if (strcmp(subsys, "net") == 0) { |
2037 | struct net_device *net = to_net_dev(dev); | |
2038 | ||
798efc60 JP |
2039 | pos++; |
2040 | pos += snprintf(hdr + pos, hdrlen - pos, | |
2041 | "DEVICE=n%u", net->ifindex); | |
c4e00daa | 2042 | } else { |
798efc60 JP |
2043 | pos++; |
2044 | pos += snprintf(hdr + pos, hdrlen - pos, | |
2045 | "DEVICE=+%s:%s", subsys, dev_name(dev)); | |
c4e00daa | 2046 | } |
af7f2158 | 2047 | |
655e5b7c BH |
2048 | if (pos >= hdrlen) |
2049 | goto overflow; | |
2050 | ||
798efc60 | 2051 | return pos; |
655e5b7c BH |
2052 | |
2053 | overflow: | |
2054 | dev_WARN(dev, "device/subsystem name too long"); | |
2055 | return 0; | |
798efc60 | 2056 | } |
798efc60 | 2057 | |
05e4e5b8 JP |
2058 | int dev_vprintk_emit(int level, const struct device *dev, |
2059 | const char *fmt, va_list args) | |
2060 | { | |
2061 | char hdr[128]; | |
2062 | size_t hdrlen; | |
2063 | ||
2064 | hdrlen = create_syslog_header(dev, hdr, sizeof(hdr)); | |
2065 | ||
2066 | return vprintk_emit(0, level, hdrlen ? hdr : NULL, hdrlen, fmt, args); | |
2067 | } | |
2068 | EXPORT_SYMBOL(dev_vprintk_emit); | |
2069 | ||
2070 | int dev_printk_emit(int level, const struct device *dev, const char *fmt, ...) | |
2071 | { | |
2072 | va_list args; | |
2073 | int r; | |
2074 | ||
2075 | va_start(args, fmt); | |
2076 | ||
2077 | r = dev_vprintk_emit(level, dev, fmt, args); | |
2078 | ||
2079 | va_end(args); | |
2080 | ||
2081 | return r; | |
2082 | } | |
2083 | EXPORT_SYMBOL(dev_printk_emit); | |
2084 | ||
798efc60 JP |
2085 | static int __dev_printk(const char *level, const struct device *dev, |
2086 | struct va_format *vaf) | |
2087 | { | |
798efc60 JP |
2088 | if (!dev) |
2089 | return printk("%s(NULL device *): %pV", level, vaf); | |
2090 | ||
666f355f JP |
2091 | return dev_printk_emit(level[1] - '0', dev, |
2092 | "%s %s: %pV", | |
2093 | dev_driver_string(dev), dev_name(dev), vaf); | |
99bcf217 JP |
2094 | } |
2095 | ||
2096 | int dev_printk(const char *level, const struct device *dev, | |
2097 | const char *fmt, ...) | |
2098 | { | |
2099 | struct va_format vaf; | |
2100 | va_list args; | |
2101 | int r; | |
2102 | ||
2103 | va_start(args, fmt); | |
2104 | ||
2105 | vaf.fmt = fmt; | |
2106 | vaf.va = &args; | |
2107 | ||
2108 | r = __dev_printk(level, dev, &vaf); | |
798efc60 | 2109 | |
99bcf217 JP |
2110 | va_end(args); |
2111 | ||
2112 | return r; | |
2113 | } | |
2114 | EXPORT_SYMBOL(dev_printk); | |
2115 | ||
2116 | #define define_dev_printk_level(func, kern_level) \ | |
2117 | int func(const struct device *dev, const char *fmt, ...) \ | |
2118 | { \ | |
2119 | struct va_format vaf; \ | |
2120 | va_list args; \ | |
2121 | int r; \ | |
2122 | \ | |
2123 | va_start(args, fmt); \ | |
2124 | \ | |
2125 | vaf.fmt = fmt; \ | |
2126 | vaf.va = &args; \ | |
2127 | \ | |
2128 | r = __dev_printk(kern_level, dev, &vaf); \ | |
798efc60 | 2129 | \ |
99bcf217 JP |
2130 | va_end(args); \ |
2131 | \ | |
2132 | return r; \ | |
2133 | } \ | |
2134 | EXPORT_SYMBOL(func); | |
2135 | ||
2136 | define_dev_printk_level(dev_emerg, KERN_EMERG); | |
2137 | define_dev_printk_level(dev_alert, KERN_ALERT); | |
2138 | define_dev_printk_level(dev_crit, KERN_CRIT); | |
2139 | define_dev_printk_level(dev_err, KERN_ERR); | |
2140 | define_dev_printk_level(dev_warn, KERN_WARNING); | |
2141 | define_dev_printk_level(dev_notice, KERN_NOTICE); | |
2142 | define_dev_printk_level(_dev_info, KERN_INFO); | |
2143 | ||
2144 | #endif |