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Commit | Line | Data |
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1da177e4 LT |
1 | /* |
2 | * drivers/base/core.c - core driver model code (device registration, etc) | |
3 | * | |
4 | * Copyright (c) 2002-3 Patrick Mochel | |
5 | * Copyright (c) 2002-3 Open Source Development Labs | |
64bb5d2c GKH |
6 | * Copyright (c) 2006 Greg Kroah-Hartman <gregkh@suse.de> |
7 | * Copyright (c) 2006 Novell, Inc. | |
1da177e4 LT |
8 | * |
9 | * This file is released under the GPLv2 | |
10 | * | |
11 | */ | |
12 | ||
1da177e4 LT |
13 | #include <linux/device.h> |
14 | #include <linux/err.h> | |
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> |
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 | |
39 | static __init int sysfs_deprecated_setup(char *arg) | |
40 | { | |
41 | return strict_strtol(arg, 10, &sysfs_deprecated); | |
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 | |
4e886c29 GKH |
52 | #ifdef CONFIG_BLOCK |
53 | static inline int device_is_not_partition(struct device *dev) | |
54 | { | |
55 | return !(dev->type == &part_type); | |
56 | } | |
57 | #else | |
58 | static inline int device_is_not_partition(struct device *dev) | |
59 | { | |
60 | return 1; | |
61 | } | |
62 | #endif | |
1da177e4 | 63 | |
3e95637a AS |
64 | /** |
65 | * dev_driver_string - Return a device's driver name, if at all possible | |
66 | * @dev: struct device to get the name of | |
67 | * | |
68 | * Will return the device's driver's name if it is bound to a device. If | |
9169c012 | 69 | * the device is not bound to a driver, it will return the name of the bus |
3e95637a AS |
70 | * it is attached to. If it is not attached to a bus either, an empty |
71 | * string will be returned. | |
72 | */ | |
bf9ca69f | 73 | const char *dev_driver_string(const struct device *dev) |
3e95637a | 74 | { |
3589972e AS |
75 | struct device_driver *drv; |
76 | ||
77 | /* dev->driver can change to NULL underneath us because of unbinding, | |
78 | * so be careful about accessing it. dev->bus and dev->class should | |
79 | * never change once they are set, so they don't need special care. | |
80 | */ | |
81 | drv = ACCESS_ONCE(dev->driver); | |
82 | return drv ? drv->name : | |
a456b702 JD |
83 | (dev->bus ? dev->bus->name : |
84 | (dev->class ? dev->class->name : "")); | |
3e95637a | 85 | } |
310a922d | 86 | EXPORT_SYMBOL(dev_driver_string); |
3e95637a | 87 | |
1da177e4 LT |
88 | #define to_dev_attr(_attr) container_of(_attr, struct device_attribute, attr) |
89 | ||
4a3ad20c GKH |
90 | static ssize_t dev_attr_show(struct kobject *kobj, struct attribute *attr, |
91 | char *buf) | |
1da177e4 | 92 | { |
4a3ad20c | 93 | struct device_attribute *dev_attr = to_dev_attr(attr); |
b0d1f807 | 94 | struct device *dev = kobj_to_dev(kobj); |
4a0c20bf | 95 | ssize_t ret = -EIO; |
1da177e4 LT |
96 | |
97 | if (dev_attr->show) | |
54b6f35c | 98 | ret = dev_attr->show(dev, dev_attr, buf); |
815d2d50 AM |
99 | if (ret >= (ssize_t)PAGE_SIZE) { |
100 | print_symbol("dev_attr_show: %s returned bad count\n", | |
101 | (unsigned long)dev_attr->show); | |
102 | } | |
1da177e4 LT |
103 | return ret; |
104 | } | |
105 | ||
4a3ad20c GKH |
106 | static ssize_t dev_attr_store(struct kobject *kobj, struct attribute *attr, |
107 | const char *buf, size_t count) | |
1da177e4 | 108 | { |
4a3ad20c | 109 | struct device_attribute *dev_attr = to_dev_attr(attr); |
b0d1f807 | 110 | struct device *dev = kobj_to_dev(kobj); |
4a0c20bf | 111 | ssize_t ret = -EIO; |
1da177e4 LT |
112 | |
113 | if (dev_attr->store) | |
54b6f35c | 114 | ret = dev_attr->store(dev, dev_attr, buf, count); |
1da177e4 LT |
115 | return ret; |
116 | } | |
117 | ||
52cf25d0 | 118 | static const struct sysfs_ops dev_sysfs_ops = { |
1da177e4 LT |
119 | .show = dev_attr_show, |
120 | .store = dev_attr_store, | |
121 | }; | |
122 | ||
ca22e56d KS |
123 | #define to_ext_attr(x) container_of(x, struct dev_ext_attribute, attr) |
124 | ||
125 | ssize_t device_store_ulong(struct device *dev, | |
126 | struct device_attribute *attr, | |
127 | const char *buf, size_t size) | |
128 | { | |
129 | struct dev_ext_attribute *ea = to_ext_attr(attr); | |
130 | char *end; | |
131 | unsigned long new = simple_strtoul(buf, &end, 0); | |
132 | if (end == buf) | |
133 | return -EINVAL; | |
134 | *(unsigned long *)(ea->var) = new; | |
135 | /* Always return full write size even if we didn't consume all */ | |
136 | return size; | |
137 | } | |
138 | EXPORT_SYMBOL_GPL(device_store_ulong); | |
139 | ||
140 | ssize_t device_show_ulong(struct device *dev, | |
141 | struct device_attribute *attr, | |
142 | char *buf) | |
143 | { | |
144 | struct dev_ext_attribute *ea = to_ext_attr(attr); | |
145 | return snprintf(buf, PAGE_SIZE, "%lx\n", *(unsigned long *)(ea->var)); | |
146 | } | |
147 | EXPORT_SYMBOL_GPL(device_show_ulong); | |
148 | ||
149 | ssize_t device_store_int(struct device *dev, | |
150 | struct device_attribute *attr, | |
151 | const char *buf, size_t size) | |
152 | { | |
153 | struct dev_ext_attribute *ea = to_ext_attr(attr); | |
154 | char *end; | |
155 | long new = simple_strtol(buf, &end, 0); | |
156 | if (end == buf || new > INT_MAX || new < INT_MIN) | |
157 | return -EINVAL; | |
158 | *(int *)(ea->var) = new; | |
159 | /* Always return full write size even if we didn't consume all */ | |
160 | return size; | |
161 | } | |
162 | EXPORT_SYMBOL_GPL(device_store_int); | |
163 | ||
164 | ssize_t device_show_int(struct device *dev, | |
165 | struct device_attribute *attr, | |
166 | char *buf) | |
167 | { | |
168 | struct dev_ext_attribute *ea = to_ext_attr(attr); | |
169 | ||
170 | return snprintf(buf, PAGE_SIZE, "%d\n", *(int *)(ea->var)); | |
171 | } | |
172 | EXPORT_SYMBOL_GPL(device_show_int); | |
1da177e4 | 173 | |
91872392 BP |
174 | ssize_t device_store_bool(struct device *dev, struct device_attribute *attr, |
175 | const char *buf, size_t size) | |
176 | { | |
177 | struct dev_ext_attribute *ea = to_ext_attr(attr); | |
178 | ||
179 | if (strtobool(buf, ea->var) < 0) | |
180 | return -EINVAL; | |
181 | ||
182 | return size; | |
183 | } | |
184 | EXPORT_SYMBOL_GPL(device_store_bool); | |
185 | ||
186 | ssize_t device_show_bool(struct device *dev, struct device_attribute *attr, | |
187 | char *buf) | |
188 | { | |
189 | struct dev_ext_attribute *ea = to_ext_attr(attr); | |
190 | ||
191 | return snprintf(buf, PAGE_SIZE, "%d\n", *(bool *)(ea->var)); | |
192 | } | |
193 | EXPORT_SYMBOL_GPL(device_show_bool); | |
194 | ||
1da177e4 LT |
195 | /** |
196 | * device_release - free device structure. | |
197 | * @kobj: device's kobject. | |
198 | * | |
199 | * This is called once the reference count for the object | |
200 | * reaches 0. We forward the call to the device's release | |
201 | * method, which should handle actually freeing the structure. | |
202 | */ | |
4a3ad20c | 203 | static void device_release(struct kobject *kobj) |
1da177e4 | 204 | { |
b0d1f807 | 205 | struct device *dev = kobj_to_dev(kobj); |
fb069a5d | 206 | struct device_private *p = dev->p; |
1da177e4 | 207 | |
a525a3dd ML |
208 | /* |
209 | * Some platform devices are driven without driver attached | |
210 | * and managed resources may have been acquired. Make sure | |
211 | * all resources are released. | |
212 | * | |
213 | * Drivers still can add resources into device after device | |
214 | * is deleted but alive, so release devres here to avoid | |
215 | * possible memory leak. | |
216 | */ | |
217 | devres_release_all(dev); | |
218 | ||
1da177e4 LT |
219 | if (dev->release) |
220 | dev->release(dev); | |
f9f852df KS |
221 | else if (dev->type && dev->type->release) |
222 | dev->type->release(dev); | |
2620efef GKH |
223 | else if (dev->class && dev->class->dev_release) |
224 | dev->class->dev_release(dev); | |
f810a5cf AV |
225 | else |
226 | WARN(1, KERN_ERR "Device '%s' does not have a release() " | |
4a3ad20c | 227 | "function, it is broken and must be fixed.\n", |
1e0b2cf9 | 228 | dev_name(dev)); |
fb069a5d | 229 | kfree(p); |
1da177e4 LT |
230 | } |
231 | ||
bc451f20 EB |
232 | static const void *device_namespace(struct kobject *kobj) |
233 | { | |
b0d1f807 | 234 | struct device *dev = kobj_to_dev(kobj); |
bc451f20 EB |
235 | const void *ns = NULL; |
236 | ||
237 | if (dev->class && dev->class->ns_type) | |
238 | ns = dev->class->namespace(dev); | |
239 | ||
240 | return ns; | |
241 | } | |
242 | ||
8f4afc41 | 243 | static struct kobj_type device_ktype = { |
1da177e4 LT |
244 | .release = device_release, |
245 | .sysfs_ops = &dev_sysfs_ops, | |
bc451f20 | 246 | .namespace = device_namespace, |
1da177e4 LT |
247 | }; |
248 | ||
249 | ||
312c004d | 250 | static int dev_uevent_filter(struct kset *kset, struct kobject *kobj) |
1da177e4 LT |
251 | { |
252 | struct kobj_type *ktype = get_ktype(kobj); | |
253 | ||
8f4afc41 | 254 | if (ktype == &device_ktype) { |
b0d1f807 | 255 | struct device *dev = kobj_to_dev(kobj); |
1da177e4 LT |
256 | if (dev->bus) |
257 | return 1; | |
23681e47 GKH |
258 | if (dev->class) |
259 | return 1; | |
1da177e4 LT |
260 | } |
261 | return 0; | |
262 | } | |
263 | ||
312c004d | 264 | static const char *dev_uevent_name(struct kset *kset, struct kobject *kobj) |
1da177e4 | 265 | { |
b0d1f807 | 266 | struct device *dev = kobj_to_dev(kobj); |
1da177e4 | 267 | |
23681e47 GKH |
268 | if (dev->bus) |
269 | return dev->bus->name; | |
270 | if (dev->class) | |
271 | return dev->class->name; | |
272 | return NULL; | |
1da177e4 LT |
273 | } |
274 | ||
7eff2e7a KS |
275 | static int dev_uevent(struct kset *kset, struct kobject *kobj, |
276 | struct kobj_uevent_env *env) | |
1da177e4 | 277 | { |
b0d1f807 | 278 | struct device *dev = kobj_to_dev(kobj); |
1da177e4 LT |
279 | int retval = 0; |
280 | ||
6fcf53ac | 281 | /* add device node properties if present */ |
23681e47 | 282 | if (MAJOR(dev->devt)) { |
6fcf53ac KS |
283 | const char *tmp; |
284 | const char *name; | |
2c9ede55 | 285 | umode_t mode = 0; |
6fcf53ac | 286 | |
7eff2e7a KS |
287 | add_uevent_var(env, "MAJOR=%u", MAJOR(dev->devt)); |
288 | add_uevent_var(env, "MINOR=%u", MINOR(dev->devt)); | |
e454cea2 | 289 | name = device_get_devnode(dev, &mode, &tmp); |
6fcf53ac KS |
290 | if (name) { |
291 | add_uevent_var(env, "DEVNAME=%s", name); | |
292 | kfree(tmp); | |
e454cea2 KS |
293 | if (mode) |
294 | add_uevent_var(env, "DEVMODE=%#o", mode & 0777); | |
6fcf53ac | 295 | } |
23681e47 GKH |
296 | } |
297 | ||
414264f9 | 298 | if (dev->type && dev->type->name) |
7eff2e7a | 299 | add_uevent_var(env, "DEVTYPE=%s", dev->type->name); |
414264f9 | 300 | |
239378f1 | 301 | if (dev->driver) |
7eff2e7a | 302 | add_uevent_var(env, "DRIVER=%s", dev->driver->name); |
239378f1 | 303 | |
07d57a32 GL |
304 | /* Add common DT information about the device */ |
305 | of_device_uevent(dev, env); | |
306 | ||
7eff2e7a | 307 | /* have the bus specific function add its stuff */ |
312c004d | 308 | if (dev->bus && dev->bus->uevent) { |
7eff2e7a | 309 | retval = dev->bus->uevent(dev, env); |
f9f852df | 310 | if (retval) |
7dc72b28 | 311 | pr_debug("device: '%s': %s: bus uevent() returned %d\n", |
1e0b2cf9 | 312 | dev_name(dev), __func__, retval); |
1da177e4 LT |
313 | } |
314 | ||
7eff2e7a | 315 | /* have the class specific function add its stuff */ |
2620efef | 316 | if (dev->class && dev->class->dev_uevent) { |
7eff2e7a | 317 | retval = dev->class->dev_uevent(dev, env); |
f9f852df | 318 | if (retval) |
7dc72b28 | 319 | pr_debug("device: '%s': %s: class uevent() " |
1e0b2cf9 | 320 | "returned %d\n", dev_name(dev), |
2b3a302a | 321 | __func__, retval); |
f9f852df KS |
322 | } |
323 | ||
eef35c2d | 324 | /* have the device type specific function add its stuff */ |
f9f852df | 325 | if (dev->type && dev->type->uevent) { |
7eff2e7a | 326 | retval = dev->type->uevent(dev, env); |
f9f852df | 327 | if (retval) |
7dc72b28 | 328 | pr_debug("device: '%s': %s: dev_type uevent() " |
1e0b2cf9 | 329 | "returned %d\n", dev_name(dev), |
2b3a302a | 330 | __func__, retval); |
2620efef GKH |
331 | } |
332 | ||
1da177e4 LT |
333 | return retval; |
334 | } | |
335 | ||
9cd43611 | 336 | static const struct kset_uevent_ops device_uevent_ops = { |
312c004d KS |
337 | .filter = dev_uevent_filter, |
338 | .name = dev_uevent_name, | |
339 | .uevent = dev_uevent, | |
1da177e4 LT |
340 | }; |
341 | ||
16574dcc KS |
342 | static ssize_t show_uevent(struct device *dev, struct device_attribute *attr, |
343 | char *buf) | |
344 | { | |
345 | struct kobject *top_kobj; | |
346 | struct kset *kset; | |
7eff2e7a | 347 | struct kobj_uevent_env *env = NULL; |
16574dcc KS |
348 | int i; |
349 | size_t count = 0; | |
350 | int retval; | |
351 | ||
352 | /* search the kset, the device belongs to */ | |
353 | top_kobj = &dev->kobj; | |
5c5daf65 KS |
354 | while (!top_kobj->kset && top_kobj->parent) |
355 | top_kobj = top_kobj->parent; | |
16574dcc KS |
356 | if (!top_kobj->kset) |
357 | goto out; | |
5c5daf65 | 358 | |
16574dcc KS |
359 | kset = top_kobj->kset; |
360 | if (!kset->uevent_ops || !kset->uevent_ops->uevent) | |
361 | goto out; | |
362 | ||
363 | /* respect filter */ | |
364 | if (kset->uevent_ops && kset->uevent_ops->filter) | |
365 | if (!kset->uevent_ops->filter(kset, &dev->kobj)) | |
366 | goto out; | |
367 | ||
7eff2e7a KS |
368 | env = kzalloc(sizeof(struct kobj_uevent_env), GFP_KERNEL); |
369 | if (!env) | |
c7308c81 GKH |
370 | return -ENOMEM; |
371 | ||
16574dcc | 372 | /* let the kset specific function add its keys */ |
7eff2e7a | 373 | retval = kset->uevent_ops->uevent(kset, &dev->kobj, env); |
16574dcc KS |
374 | if (retval) |
375 | goto out; | |
376 | ||
377 | /* copy keys to file */ | |
7eff2e7a KS |
378 | for (i = 0; i < env->envp_idx; i++) |
379 | count += sprintf(&buf[count], "%s\n", env->envp[i]); | |
16574dcc | 380 | out: |
7eff2e7a | 381 | kfree(env); |
16574dcc KS |
382 | return count; |
383 | } | |
384 | ||
a7fd6706 KS |
385 | static ssize_t store_uevent(struct device *dev, struct device_attribute *attr, |
386 | const char *buf, size_t count) | |
387 | { | |
60a96a59 KS |
388 | enum kobject_action action; |
389 | ||
3f5468c9 | 390 | if (kobject_action_type(buf, count, &action) == 0) |
60a96a59 | 391 | kobject_uevent(&dev->kobj, action); |
3f5468c9 KS |
392 | else |
393 | dev_err(dev, "uevent: unknown action-string\n"); | |
a7fd6706 KS |
394 | return count; |
395 | } | |
396 | ||
ad6a1e1c TH |
397 | static struct device_attribute uevent_attr = |
398 | __ATTR(uevent, S_IRUGO | S_IWUSR, show_uevent, store_uevent); | |
399 | ||
621a1672 DT |
400 | static int device_add_attributes(struct device *dev, |
401 | struct device_attribute *attrs) | |
de0ff00d | 402 | { |
621a1672 | 403 | int error = 0; |
de0ff00d | 404 | int i; |
621a1672 DT |
405 | |
406 | if (attrs) { | |
407 | for (i = 0; attr_name(attrs[i]); i++) { | |
408 | error = device_create_file(dev, &attrs[i]); | |
409 | if (error) | |
410 | break; | |
411 | } | |
412 | if (error) | |
413 | while (--i >= 0) | |
414 | device_remove_file(dev, &attrs[i]); | |
415 | } | |
416 | return error; | |
417 | } | |
418 | ||
419 | static void device_remove_attributes(struct device *dev, | |
420 | struct device_attribute *attrs) | |
421 | { | |
422 | int i; | |
423 | ||
424 | if (attrs) | |
425 | for (i = 0; attr_name(attrs[i]); i++) | |
426 | device_remove_file(dev, &attrs[i]); | |
427 | } | |
428 | ||
c97415a7 SA |
429 | static int device_add_bin_attributes(struct device *dev, |
430 | struct bin_attribute *attrs) | |
431 | { | |
432 | int error = 0; | |
433 | int i; | |
434 | ||
435 | if (attrs) { | |
436 | for (i = 0; attr_name(attrs[i]); i++) { | |
437 | error = device_create_bin_file(dev, &attrs[i]); | |
438 | if (error) | |
439 | break; | |
440 | } | |
441 | if (error) | |
442 | while (--i >= 0) | |
443 | device_remove_bin_file(dev, &attrs[i]); | |
444 | } | |
445 | return error; | |
446 | } | |
447 | ||
448 | static void device_remove_bin_attributes(struct device *dev, | |
449 | struct bin_attribute *attrs) | |
450 | { | |
451 | int i; | |
452 | ||
453 | if (attrs) | |
454 | for (i = 0; attr_name(attrs[i]); i++) | |
455 | device_remove_bin_file(dev, &attrs[i]); | |
456 | } | |
457 | ||
621a1672 | 458 | static int device_add_groups(struct device *dev, |
a4dbd674 | 459 | const struct attribute_group **groups) |
621a1672 | 460 | { |
de0ff00d | 461 | int error = 0; |
621a1672 | 462 | int i; |
de0ff00d | 463 | |
621a1672 DT |
464 | if (groups) { |
465 | for (i = 0; groups[i]; i++) { | |
466 | error = sysfs_create_group(&dev->kobj, groups[i]); | |
de0ff00d GKH |
467 | if (error) { |
468 | while (--i >= 0) | |
4a3ad20c GKH |
469 | sysfs_remove_group(&dev->kobj, |
470 | groups[i]); | |
621a1672 | 471 | break; |
de0ff00d GKH |
472 | } |
473 | } | |
474 | } | |
de0ff00d GKH |
475 | return error; |
476 | } | |
477 | ||
621a1672 | 478 | static void device_remove_groups(struct device *dev, |
a4dbd674 | 479 | const struct attribute_group **groups) |
de0ff00d GKH |
480 | { |
481 | int i; | |
621a1672 DT |
482 | |
483 | if (groups) | |
484 | for (i = 0; groups[i]; i++) | |
485 | sysfs_remove_group(&dev->kobj, groups[i]); | |
de0ff00d GKH |
486 | } |
487 | ||
2620efef GKH |
488 | static int device_add_attrs(struct device *dev) |
489 | { | |
490 | struct class *class = dev->class; | |
aed65af1 | 491 | const struct device_type *type = dev->type; |
621a1672 | 492 | int error; |
2620efef | 493 | |
621a1672 DT |
494 | if (class) { |
495 | error = device_add_attributes(dev, class->dev_attrs); | |
f9f852df | 496 | if (error) |
621a1672 | 497 | return error; |
c97415a7 SA |
498 | error = device_add_bin_attributes(dev, class->dev_bin_attrs); |
499 | if (error) | |
500 | goto err_remove_class_attrs; | |
2620efef | 501 | } |
f9f852df | 502 | |
621a1672 DT |
503 | if (type) { |
504 | error = device_add_groups(dev, type->groups); | |
f9f852df | 505 | if (error) |
c97415a7 | 506 | goto err_remove_class_bin_attrs; |
f9f852df KS |
507 | } |
508 | ||
621a1672 DT |
509 | error = device_add_groups(dev, dev->groups); |
510 | if (error) | |
511 | goto err_remove_type_groups; | |
512 | ||
513 | return 0; | |
514 | ||
515 | err_remove_type_groups: | |
516 | if (type) | |
517 | device_remove_groups(dev, type->groups); | |
c97415a7 SA |
518 | err_remove_class_bin_attrs: |
519 | if (class) | |
520 | device_remove_bin_attributes(dev, class->dev_bin_attrs); | |
621a1672 DT |
521 | err_remove_class_attrs: |
522 | if (class) | |
523 | device_remove_attributes(dev, class->dev_attrs); | |
524 | ||
2620efef GKH |
525 | return error; |
526 | } | |
527 | ||
528 | static void device_remove_attrs(struct device *dev) | |
529 | { | |
530 | struct class *class = dev->class; | |
aed65af1 | 531 | const struct device_type *type = dev->type; |
2620efef | 532 | |
621a1672 | 533 | device_remove_groups(dev, dev->groups); |
f9f852df | 534 | |
621a1672 DT |
535 | if (type) |
536 | device_remove_groups(dev, type->groups); | |
537 | ||
c97415a7 | 538 | if (class) { |
621a1672 | 539 | device_remove_attributes(dev, class->dev_attrs); |
c97415a7 SA |
540 | device_remove_bin_attributes(dev, class->dev_bin_attrs); |
541 | } | |
2620efef GKH |
542 | } |
543 | ||
544 | ||
23681e47 GKH |
545 | static ssize_t show_dev(struct device *dev, struct device_attribute *attr, |
546 | char *buf) | |
547 | { | |
548 | return print_dev_t(buf, dev->devt); | |
549 | } | |
550 | ||
ad6a1e1c TH |
551 | static struct device_attribute devt_attr = |
552 | __ATTR(dev, S_IRUGO, show_dev, NULL); | |
553 | ||
ca22e56d | 554 | /* /sys/devices/ */ |
881c6cfd | 555 | struct kset *devices_kset; |
1da177e4 | 556 | |
1da177e4 | 557 | /** |
4a3ad20c GKH |
558 | * device_create_file - create sysfs attribute file for device. |
559 | * @dev: device. | |
560 | * @attr: device attribute descriptor. | |
1da177e4 | 561 | */ |
26579ab7 PC |
562 | int device_create_file(struct device *dev, |
563 | const struct device_attribute *attr) | |
1da177e4 LT |
564 | { |
565 | int error = 0; | |
0c98b19f | 566 | if (dev) |
1da177e4 | 567 | error = sysfs_create_file(&dev->kobj, &attr->attr); |
1da177e4 LT |
568 | return error; |
569 | } | |
570 | ||
571 | /** | |
4a3ad20c GKH |
572 | * device_remove_file - remove sysfs attribute file. |
573 | * @dev: device. | |
574 | * @attr: device attribute descriptor. | |
1da177e4 | 575 | */ |
26579ab7 PC |
576 | void device_remove_file(struct device *dev, |
577 | const struct device_attribute *attr) | |
1da177e4 | 578 | { |
0c98b19f | 579 | if (dev) |
1da177e4 | 580 | sysfs_remove_file(&dev->kobj, &attr->attr); |
1da177e4 LT |
581 | } |
582 | ||
2589f188 GKH |
583 | /** |
584 | * device_create_bin_file - create sysfs binary attribute file for device. | |
585 | * @dev: device. | |
586 | * @attr: device binary attribute descriptor. | |
587 | */ | |
66ecb92b PC |
588 | int device_create_bin_file(struct device *dev, |
589 | const struct bin_attribute *attr) | |
2589f188 GKH |
590 | { |
591 | int error = -EINVAL; | |
592 | if (dev) | |
593 | error = sysfs_create_bin_file(&dev->kobj, attr); | |
594 | return error; | |
595 | } | |
596 | EXPORT_SYMBOL_GPL(device_create_bin_file); | |
597 | ||
598 | /** | |
599 | * device_remove_bin_file - remove sysfs binary attribute file | |
600 | * @dev: device. | |
601 | * @attr: device binary attribute descriptor. | |
602 | */ | |
66ecb92b PC |
603 | void device_remove_bin_file(struct device *dev, |
604 | const struct bin_attribute *attr) | |
2589f188 GKH |
605 | { |
606 | if (dev) | |
607 | sysfs_remove_bin_file(&dev->kobj, attr); | |
608 | } | |
609 | EXPORT_SYMBOL_GPL(device_remove_bin_file); | |
610 | ||
d9a9cdfb | 611 | /** |
523ded71 | 612 | * device_schedule_callback_owner - helper to schedule a callback for a device |
d9a9cdfb AS |
613 | * @dev: device. |
614 | * @func: callback function to invoke later. | |
523ded71 | 615 | * @owner: module owning the callback routine |
d9a9cdfb AS |
616 | * |
617 | * Attribute methods must not unregister themselves or their parent device | |
618 | * (which would amount to the same thing). Attempts to do so will deadlock, | |
619 | * since unregistration is mutually exclusive with driver callbacks. | |
620 | * | |
621 | * Instead methods can call this routine, which will attempt to allocate | |
622 | * and schedule a workqueue request to call back @func with @dev as its | |
623 | * argument in the workqueue's process context. @dev will be pinned until | |
624 | * @func returns. | |
625 | * | |
523ded71 AS |
626 | * This routine is usually called via the inline device_schedule_callback(), |
627 | * which automatically sets @owner to THIS_MODULE. | |
628 | * | |
d9a9cdfb | 629 | * Returns 0 if the request was submitted, -ENOMEM if storage could not |
523ded71 | 630 | * be allocated, -ENODEV if a reference to @owner isn't available. |
d9a9cdfb AS |
631 | * |
632 | * NOTE: This routine won't work if CONFIG_SYSFS isn't set! It uses an | |
633 | * underlying sysfs routine (since it is intended for use by attribute | |
634 | * methods), and if sysfs isn't available you'll get nothing but -ENOSYS. | |
635 | */ | |
523ded71 AS |
636 | int device_schedule_callback_owner(struct device *dev, |
637 | void (*func)(struct device *), struct module *owner) | |
d9a9cdfb AS |
638 | { |
639 | return sysfs_schedule_callback(&dev->kobj, | |
523ded71 | 640 | (void (*)(void *)) func, dev, owner); |
d9a9cdfb | 641 | } |
523ded71 | 642 | EXPORT_SYMBOL_GPL(device_schedule_callback_owner); |
d9a9cdfb | 643 | |
34bb61f9 JB |
644 | static void klist_children_get(struct klist_node *n) |
645 | { | |
f791b8c8 GKH |
646 | struct device_private *p = to_device_private_parent(n); |
647 | struct device *dev = p->device; | |
34bb61f9 JB |
648 | |
649 | get_device(dev); | |
650 | } | |
651 | ||
652 | static void klist_children_put(struct klist_node *n) | |
653 | { | |
f791b8c8 GKH |
654 | struct device_private *p = to_device_private_parent(n); |
655 | struct device *dev = p->device; | |
34bb61f9 JB |
656 | |
657 | put_device(dev); | |
658 | } | |
659 | ||
1da177e4 | 660 | /** |
4a3ad20c GKH |
661 | * device_initialize - init device structure. |
662 | * @dev: device. | |
1da177e4 | 663 | * |
5739411a CH |
664 | * This prepares the device for use by other layers by initializing |
665 | * its fields. | |
4a3ad20c | 666 | * It is the first half of device_register(), if called by |
5739411a CH |
667 | * that function, though it can also be called separately, so one |
668 | * may use @dev's fields. In particular, get_device()/put_device() | |
669 | * may be used for reference counting of @dev after calling this | |
670 | * function. | |
671 | * | |
b10d5efd AS |
672 | * All fields in @dev must be initialized by the caller to 0, except |
673 | * for those explicitly set to some other value. The simplest | |
674 | * approach is to use kzalloc() to allocate the structure containing | |
675 | * @dev. | |
676 | * | |
5739411a CH |
677 | * NOTE: Use put_device() to give up your reference instead of freeing |
678 | * @dev directly once you have called this function. | |
1da177e4 | 679 | */ |
1da177e4 LT |
680 | void device_initialize(struct device *dev) |
681 | { | |
881c6cfd | 682 | dev->kobj.kset = devices_kset; |
f9cb074b | 683 | kobject_init(&dev->kobj, &device_ktype); |
1da177e4 | 684 | INIT_LIST_HEAD(&dev->dma_pools); |
3142788b | 685 | mutex_init(&dev->mutex); |
1704f47b | 686 | lockdep_set_novalidate_class(&dev->mutex); |
9ac7849e TH |
687 | spin_lock_init(&dev->devres_lock); |
688 | INIT_LIST_HEAD(&dev->devres_head); | |
3b98aeaf | 689 | device_pm_init(dev); |
87348136 | 690 | set_dev_node(dev, -1); |
1da177e4 LT |
691 | } |
692 | ||
86406245 | 693 | static struct kobject *virtual_device_parent(struct device *dev) |
f0ee61a6 | 694 | { |
86406245 | 695 | static struct kobject *virtual_dir = NULL; |
f0ee61a6 | 696 | |
86406245 | 697 | if (!virtual_dir) |
4ff6abff | 698 | virtual_dir = kobject_create_and_add("virtual", |
881c6cfd | 699 | &devices_kset->kobj); |
f0ee61a6 | 700 | |
86406245 | 701 | return virtual_dir; |
f0ee61a6 GKH |
702 | } |
703 | ||
bc451f20 EB |
704 | struct class_dir { |
705 | struct kobject kobj; | |
706 | struct class *class; | |
707 | }; | |
708 | ||
709 | #define to_class_dir(obj) container_of(obj, struct class_dir, kobj) | |
710 | ||
711 | static void class_dir_release(struct kobject *kobj) | |
712 | { | |
713 | struct class_dir *dir = to_class_dir(kobj); | |
714 | kfree(dir); | |
715 | } | |
716 | ||
717 | static const | |
718 | struct kobj_ns_type_operations *class_dir_child_ns_type(struct kobject *kobj) | |
40fa5422 | 719 | { |
bc451f20 EB |
720 | struct class_dir *dir = to_class_dir(kobj); |
721 | return dir->class->ns_type; | |
722 | } | |
723 | ||
724 | static struct kobj_type class_dir_ktype = { | |
725 | .release = class_dir_release, | |
726 | .sysfs_ops = &kobj_sysfs_ops, | |
727 | .child_ns_type = class_dir_child_ns_type | |
728 | }; | |
729 | ||
730 | static struct kobject * | |
731 | class_dir_create_and_add(struct class *class, struct kobject *parent_kobj) | |
732 | { | |
733 | struct class_dir *dir; | |
43968d2f GKH |
734 | int retval; |
735 | ||
bc451f20 EB |
736 | dir = kzalloc(sizeof(*dir), GFP_KERNEL); |
737 | if (!dir) | |
738 | return NULL; | |
739 | ||
740 | dir->class = class; | |
741 | kobject_init(&dir->kobj, &class_dir_ktype); | |
742 | ||
6b6e39a6 | 743 | dir->kobj.kset = &class->p->glue_dirs; |
bc451f20 EB |
744 | |
745 | retval = kobject_add(&dir->kobj, parent_kobj, "%s", class->name); | |
746 | if (retval < 0) { | |
747 | kobject_put(&dir->kobj); | |
748 | return NULL; | |
749 | } | |
750 | return &dir->kobj; | |
751 | } | |
752 | ||
753 | ||
754 | static struct kobject *get_device_parent(struct device *dev, | |
755 | struct device *parent) | |
756 | { | |
86406245 | 757 | if (dev->class) { |
77d3d7c1 | 758 | static DEFINE_MUTEX(gdp_mutex); |
86406245 KS |
759 | struct kobject *kobj = NULL; |
760 | struct kobject *parent_kobj; | |
761 | struct kobject *k; | |
762 | ||
ead454fe | 763 | #ifdef CONFIG_BLOCK |
39aba963 | 764 | /* block disks show up in /sys/block */ |
e52eec13 | 765 | if (sysfs_deprecated && dev->class == &block_class) { |
39aba963 KS |
766 | if (parent && parent->class == &block_class) |
767 | return &parent->kobj; | |
6b6e39a6 | 768 | return &block_class.p->subsys.kobj; |
39aba963 | 769 | } |
ead454fe | 770 | #endif |
e52eec13 | 771 | |
86406245 KS |
772 | /* |
773 | * If we have no parent, we live in "virtual". | |
0f4dafc0 KS |
774 | * Class-devices with a non class-device as parent, live |
775 | * in a "glue" directory to prevent namespace collisions. | |
86406245 KS |
776 | */ |
777 | if (parent == NULL) | |
778 | parent_kobj = virtual_device_parent(dev); | |
24b1442d | 779 | else if (parent->class && !dev->class->ns_type) |
86406245 KS |
780 | return &parent->kobj; |
781 | else | |
782 | parent_kobj = &parent->kobj; | |
783 | ||
77d3d7c1 TH |
784 | mutex_lock(&gdp_mutex); |
785 | ||
86406245 | 786 | /* find our class-directory at the parent and reference it */ |
6b6e39a6 KS |
787 | spin_lock(&dev->class->p->glue_dirs.list_lock); |
788 | list_for_each_entry(k, &dev->class->p->glue_dirs.list, entry) | |
86406245 KS |
789 | if (k->parent == parent_kobj) { |
790 | kobj = kobject_get(k); | |
791 | break; | |
792 | } | |
6b6e39a6 | 793 | spin_unlock(&dev->class->p->glue_dirs.list_lock); |
77d3d7c1 TH |
794 | if (kobj) { |
795 | mutex_unlock(&gdp_mutex); | |
86406245 | 796 | return kobj; |
77d3d7c1 | 797 | } |
86406245 KS |
798 | |
799 | /* or create a new class-directory at the parent device */ | |
bc451f20 | 800 | k = class_dir_create_and_add(dev->class, parent_kobj); |
0f4dafc0 | 801 | /* do not emit an uevent for this simple "glue" directory */ |
77d3d7c1 | 802 | mutex_unlock(&gdp_mutex); |
43968d2f | 803 | return k; |
86406245 KS |
804 | } |
805 | ||
ca22e56d KS |
806 | /* subsystems can specify a default root directory for their devices */ |
807 | if (!parent && dev->bus && dev->bus->dev_root) | |
808 | return &dev->bus->dev_root->kobj; | |
809 | ||
86406245 | 810 | if (parent) |
c744aeae CH |
811 | return &parent->kobj; |
812 | return NULL; | |
813 | } | |
da231fd5 | 814 | |
63b6971a | 815 | static void cleanup_glue_dir(struct device *dev, struct kobject *glue_dir) |
da231fd5 | 816 | { |
0f4dafc0 | 817 | /* see if we live in a "glue" directory */ |
c1fe539a | 818 | if (!glue_dir || !dev->class || |
6b6e39a6 | 819 | glue_dir->kset != &dev->class->p->glue_dirs) |
da231fd5 KS |
820 | return; |
821 | ||
0f4dafc0 | 822 | kobject_put(glue_dir); |
da231fd5 | 823 | } |
63b6971a CH |
824 | |
825 | static void cleanup_device_parent(struct device *dev) | |
826 | { | |
827 | cleanup_glue_dir(dev, dev->kobj.parent); | |
828 | } | |
86406245 | 829 | |
2ee97caf CH |
830 | static int device_add_class_symlinks(struct device *dev) |
831 | { | |
832 | int error; | |
833 | ||
834 | if (!dev->class) | |
835 | return 0; | |
da231fd5 | 836 | |
1fbfee6c | 837 | error = sysfs_create_link(&dev->kobj, |
6b6e39a6 | 838 | &dev->class->p->subsys.kobj, |
2ee97caf CH |
839 | "subsystem"); |
840 | if (error) | |
841 | goto out; | |
da231fd5 | 842 | |
4e886c29 | 843 | if (dev->parent && device_is_not_partition(dev)) { |
39aba963 | 844 | error = sysfs_create_link(&dev->kobj, &dev->parent->kobj, |
4f01a757 DT |
845 | "device"); |
846 | if (error) | |
39aba963 | 847 | goto out_subsys; |
2ee97caf | 848 | } |
2ee97caf | 849 | |
ead454fe | 850 | #ifdef CONFIG_BLOCK |
39aba963 | 851 | /* /sys/block has directories and does not need symlinks */ |
e52eec13 | 852 | if (sysfs_deprecated && dev->class == &block_class) |
39aba963 | 853 | return 0; |
ead454fe | 854 | #endif |
39aba963 | 855 | |
da231fd5 | 856 | /* link in the class directory pointing to the device */ |
6b6e39a6 | 857 | error = sysfs_create_link(&dev->class->p->subsys.kobj, |
1e0b2cf9 | 858 | &dev->kobj, dev_name(dev)); |
da231fd5 | 859 | if (error) |
39aba963 | 860 | goto out_device; |
da231fd5 | 861 | |
da231fd5 KS |
862 | return 0; |
863 | ||
39aba963 KS |
864 | out_device: |
865 | sysfs_remove_link(&dev->kobj, "device"); | |
da231fd5 | 866 | |
2ee97caf CH |
867 | out_subsys: |
868 | sysfs_remove_link(&dev->kobj, "subsystem"); | |
869 | out: | |
870 | return error; | |
871 | } | |
872 | ||
873 | static void device_remove_class_symlinks(struct device *dev) | |
874 | { | |
875 | if (!dev->class) | |
876 | return; | |
da231fd5 | 877 | |
4e886c29 | 878 | if (dev->parent && device_is_not_partition(dev)) |
da231fd5 | 879 | sysfs_remove_link(&dev->kobj, "device"); |
2ee97caf | 880 | sysfs_remove_link(&dev->kobj, "subsystem"); |
ead454fe | 881 | #ifdef CONFIG_BLOCK |
e52eec13 | 882 | if (sysfs_deprecated && dev->class == &block_class) |
39aba963 | 883 | return; |
ead454fe | 884 | #endif |
6b6e39a6 | 885 | sysfs_delete_link(&dev->class->p->subsys.kobj, &dev->kobj, dev_name(dev)); |
2ee97caf CH |
886 | } |
887 | ||
413c239f SR |
888 | /** |
889 | * dev_set_name - set a device name | |
890 | * @dev: device | |
46232366 | 891 | * @fmt: format string for the device's name |
413c239f SR |
892 | */ |
893 | int dev_set_name(struct device *dev, const char *fmt, ...) | |
894 | { | |
895 | va_list vargs; | |
1fa5ae85 | 896 | int err; |
413c239f SR |
897 | |
898 | va_start(vargs, fmt); | |
1fa5ae85 | 899 | err = kobject_set_name_vargs(&dev->kobj, fmt, vargs); |
413c239f | 900 | va_end(vargs); |
1fa5ae85 | 901 | return err; |
413c239f SR |
902 | } |
903 | EXPORT_SYMBOL_GPL(dev_set_name); | |
904 | ||
e105b8bf DW |
905 | /** |
906 | * device_to_dev_kobj - select a /sys/dev/ directory for the device | |
907 | * @dev: device | |
908 | * | |
909 | * By default we select char/ for new entries. Setting class->dev_obj | |
910 | * to NULL prevents an entry from being created. class->dev_kobj must | |
911 | * be set (or cleared) before any devices are registered to the class | |
912 | * otherwise device_create_sys_dev_entry() and | |
0d4e293c PK |
913 | * device_remove_sys_dev_entry() will disagree about the presence of |
914 | * the link. | |
e105b8bf DW |
915 | */ |
916 | static struct kobject *device_to_dev_kobj(struct device *dev) | |
917 | { | |
918 | struct kobject *kobj; | |
919 | ||
920 | if (dev->class) | |
921 | kobj = dev->class->dev_kobj; | |
922 | else | |
923 | kobj = sysfs_dev_char_kobj; | |
924 | ||
925 | return kobj; | |
926 | } | |
927 | ||
928 | static int device_create_sys_dev_entry(struct device *dev) | |
929 | { | |
930 | struct kobject *kobj = device_to_dev_kobj(dev); | |
931 | int error = 0; | |
932 | char devt_str[15]; | |
933 | ||
934 | if (kobj) { | |
935 | format_dev_t(devt_str, dev->devt); | |
936 | error = sysfs_create_link(kobj, &dev->kobj, devt_str); | |
937 | } | |
938 | ||
939 | return error; | |
940 | } | |
941 | ||
942 | static void device_remove_sys_dev_entry(struct device *dev) | |
943 | { | |
944 | struct kobject *kobj = device_to_dev_kobj(dev); | |
945 | char devt_str[15]; | |
946 | ||
947 | if (kobj) { | |
948 | format_dev_t(devt_str, dev->devt); | |
949 | sysfs_remove_link(kobj, devt_str); | |
950 | } | |
951 | } | |
952 | ||
b4028437 GKH |
953 | int device_private_init(struct device *dev) |
954 | { | |
955 | dev->p = kzalloc(sizeof(*dev->p), GFP_KERNEL); | |
956 | if (!dev->p) | |
957 | return -ENOMEM; | |
958 | dev->p->device = dev; | |
959 | klist_init(&dev->p->klist_children, klist_children_get, | |
960 | klist_children_put); | |
ef8a3fd6 | 961 | INIT_LIST_HEAD(&dev->p->deferred_probe); |
b4028437 GKH |
962 | return 0; |
963 | } | |
964 | ||
1da177e4 | 965 | /** |
4a3ad20c GKH |
966 | * device_add - add device to device hierarchy. |
967 | * @dev: device. | |
1da177e4 | 968 | * |
4a3ad20c GKH |
969 | * This is part 2 of device_register(), though may be called |
970 | * separately _iff_ device_initialize() has been called separately. | |
1da177e4 | 971 | * |
5739411a | 972 | * This adds @dev to the kobject hierarchy via kobject_add(), adds it |
4a3ad20c GKH |
973 | * to the global and sibling lists for the device, then |
974 | * adds it to the other relevant subsystems of the driver model. | |
5739411a | 975 | * |
b10d5efd AS |
976 | * Do not call this routine or device_register() more than once for |
977 | * any device structure. The driver model core is not designed to work | |
978 | * with devices that get unregistered and then spring back to life. | |
979 | * (Among other things, it's very hard to guarantee that all references | |
980 | * to the previous incarnation of @dev have been dropped.) Allocate | |
981 | * and register a fresh new struct device instead. | |
982 | * | |
5739411a CH |
983 | * NOTE: _Never_ directly free @dev after calling this function, even |
984 | * if it returned an error! Always use put_device() to give up your | |
985 | * reference instead. | |
1da177e4 LT |
986 | */ |
987 | int device_add(struct device *dev) | |
988 | { | |
989 | struct device *parent = NULL; | |
ca22e56d | 990 | struct kobject *kobj; |
c47ed219 | 991 | struct class_interface *class_intf; |
c906a48a | 992 | int error = -EINVAL; |
775b64d2 | 993 | |
1da177e4 | 994 | dev = get_device(dev); |
c906a48a GKH |
995 | if (!dev) |
996 | goto done; | |
997 | ||
fb069a5d | 998 | if (!dev->p) { |
b4028437 GKH |
999 | error = device_private_init(dev); |
1000 | if (error) | |
1001 | goto done; | |
fb069a5d | 1002 | } |
fb069a5d | 1003 | |
1fa5ae85 KS |
1004 | /* |
1005 | * for statically allocated devices, which should all be converted | |
1006 | * some day, we need to initialize the name. We prevent reading back | |
1007 | * the name, and force the use of dev_name() | |
1008 | */ | |
1009 | if (dev->init_name) { | |
acc0e90f | 1010 | dev_set_name(dev, "%s", dev->init_name); |
1fa5ae85 KS |
1011 | dev->init_name = NULL; |
1012 | } | |
c906a48a | 1013 | |
ca22e56d KS |
1014 | /* subsystems can specify simple device enumeration */ |
1015 | if (!dev_name(dev) && dev->bus && dev->bus->dev_name) | |
1016 | dev_set_name(dev, "%s%u", dev->bus->dev_name, dev->id); | |
1017 | ||
e6309e75 TG |
1018 | if (!dev_name(dev)) { |
1019 | error = -EINVAL; | |
5c8563d7 | 1020 | goto name_error; |
e6309e75 | 1021 | } |
1da177e4 | 1022 | |
1e0b2cf9 | 1023 | pr_debug("device: '%s': %s\n", dev_name(dev), __func__); |
c205ef48 | 1024 | |
1da177e4 | 1025 | parent = get_device(dev->parent); |
ca22e56d KS |
1026 | kobj = get_device_parent(dev, parent); |
1027 | if (kobj) | |
1028 | dev->kobj.parent = kobj; | |
1da177e4 | 1029 | |
0d358f22 YL |
1030 | /* use parent numa_node */ |
1031 | if (parent) | |
1032 | set_dev_node(dev, dev_to_node(parent)); | |
1033 | ||
1da177e4 | 1034 | /* first, register with generic layer. */ |
8a577ffc KS |
1035 | /* we require the name to be set before, and pass NULL */ |
1036 | error = kobject_add(&dev->kobj, dev->kobj.parent, NULL); | |
40fa5422 | 1037 | if (error) |
1da177e4 | 1038 | goto Error; |
a7fd6706 | 1039 | |
37022644 BW |
1040 | /* notify platform of device entry */ |
1041 | if (platform_notify) | |
1042 | platform_notify(dev); | |
1043 | ||
ad6a1e1c | 1044 | error = device_create_file(dev, &uevent_attr); |
a306eea4 CH |
1045 | if (error) |
1046 | goto attrError; | |
a7fd6706 | 1047 | |
23681e47 | 1048 | if (MAJOR(dev->devt)) { |
ad6a1e1c TH |
1049 | error = device_create_file(dev, &devt_attr); |
1050 | if (error) | |
a306eea4 | 1051 | goto ueventattrError; |
e105b8bf DW |
1052 | |
1053 | error = device_create_sys_dev_entry(dev); | |
1054 | if (error) | |
1055 | goto devtattrError; | |
2b2af54a KS |
1056 | |
1057 | devtmpfs_create_node(dev); | |
23681e47 GKH |
1058 | } |
1059 | ||
2ee97caf CH |
1060 | error = device_add_class_symlinks(dev); |
1061 | if (error) | |
1062 | goto SymlinkError; | |
dc0afa83 CH |
1063 | error = device_add_attrs(dev); |
1064 | if (error) | |
2620efef | 1065 | goto AttrsError; |
dc0afa83 CH |
1066 | error = bus_add_device(dev); |
1067 | if (error) | |
1da177e4 | 1068 | goto BusError; |
3b98aeaf | 1069 | error = dpm_sysfs_add(dev); |
57eee3d2 | 1070 | if (error) |
3b98aeaf AS |
1071 | goto DPMError; |
1072 | device_pm_add(dev); | |
ec0676ee AS |
1073 | |
1074 | /* Notify clients of device addition. This call must come | |
268863f4 | 1075 | * after dpm_sysfs_add() and before kobject_uevent(). |
ec0676ee AS |
1076 | */ |
1077 | if (dev->bus) | |
1078 | blocking_notifier_call_chain(&dev->bus->p->bus_notifier, | |
1079 | BUS_NOTIFY_ADD_DEVICE, dev); | |
1080 | ||
83b5fb4c | 1081 | kobject_uevent(&dev->kobj, KOBJ_ADD); |
2023c610 | 1082 | bus_probe_device(dev); |
1da177e4 | 1083 | if (parent) |
f791b8c8 GKH |
1084 | klist_add_tail(&dev->p->knode_parent, |
1085 | &parent->p->klist_children); | |
1da177e4 | 1086 | |
5d9fd169 | 1087 | if (dev->class) { |
ca22e56d | 1088 | mutex_lock(&dev->class->p->mutex); |
c47ed219 | 1089 | /* tie the class to the device */ |
5a3ceb86 | 1090 | klist_add_tail(&dev->knode_class, |
6b6e39a6 | 1091 | &dev->class->p->klist_devices); |
c47ed219 GKH |
1092 | |
1093 | /* notify any interfaces that the device is here */ | |
184f1f77 | 1094 | list_for_each_entry(class_intf, |
ca22e56d | 1095 | &dev->class->p->interfaces, node) |
c47ed219 GKH |
1096 | if (class_intf->add_dev) |
1097 | class_intf->add_dev(dev, class_intf); | |
ca22e56d | 1098 | mutex_unlock(&dev->class->p->mutex); |
5d9fd169 | 1099 | } |
c906a48a | 1100 | done: |
1da177e4 LT |
1101 | put_device(dev); |
1102 | return error; | |
3b98aeaf | 1103 | DPMError: |
57eee3d2 RW |
1104 | bus_remove_device(dev); |
1105 | BusError: | |
82f0cf9b | 1106 | device_remove_attrs(dev); |
2620efef | 1107 | AttrsError: |
2ee97caf CH |
1108 | device_remove_class_symlinks(dev); |
1109 | SymlinkError: | |
ad72956d KS |
1110 | if (MAJOR(dev->devt)) |
1111 | devtmpfs_delete_node(dev); | |
e105b8bf DW |
1112 | if (MAJOR(dev->devt)) |
1113 | device_remove_sys_dev_entry(dev); | |
1114 | devtattrError: | |
ad6a1e1c TH |
1115 | if (MAJOR(dev->devt)) |
1116 | device_remove_file(dev, &devt_attr); | |
a306eea4 | 1117 | ueventattrError: |
ad6a1e1c | 1118 | device_remove_file(dev, &uevent_attr); |
23681e47 | 1119 | attrError: |
312c004d | 1120 | kobject_uevent(&dev->kobj, KOBJ_REMOVE); |
1da177e4 LT |
1121 | kobject_del(&dev->kobj); |
1122 | Error: | |
63b6971a | 1123 | cleanup_device_parent(dev); |
1da177e4 LT |
1124 | if (parent) |
1125 | put_device(parent); | |
5c8563d7 KS |
1126 | name_error: |
1127 | kfree(dev->p); | |
1128 | dev->p = NULL; | |
c906a48a | 1129 | goto done; |
1da177e4 LT |
1130 | } |
1131 | ||
1da177e4 | 1132 | /** |
4a3ad20c GKH |
1133 | * device_register - register a device with the system. |
1134 | * @dev: pointer to the device structure | |
1da177e4 | 1135 | * |
4a3ad20c GKH |
1136 | * This happens in two clean steps - initialize the device |
1137 | * and add it to the system. The two steps can be called | |
1138 | * separately, but this is the easiest and most common. | |
1139 | * I.e. you should only call the two helpers separately if | |
1140 | * have a clearly defined need to use and refcount the device | |
1141 | * before it is added to the hierarchy. | |
5739411a | 1142 | * |
b10d5efd AS |
1143 | * For more information, see the kerneldoc for device_initialize() |
1144 | * and device_add(). | |
1145 | * | |
5739411a CH |
1146 | * NOTE: _Never_ directly free @dev after calling this function, even |
1147 | * if it returned an error! Always use put_device() to give up the | |
1148 | * reference initialized in this function instead. | |
1da177e4 | 1149 | */ |
1da177e4 LT |
1150 | int device_register(struct device *dev) |
1151 | { | |
1152 | device_initialize(dev); | |
1153 | return device_add(dev); | |
1154 | } | |
1155 | ||
1da177e4 | 1156 | /** |
4a3ad20c GKH |
1157 | * get_device - increment reference count for device. |
1158 | * @dev: device. | |
1da177e4 | 1159 | * |
4a3ad20c GKH |
1160 | * This simply forwards the call to kobject_get(), though |
1161 | * we do take care to provide for the case that we get a NULL | |
1162 | * pointer passed in. | |
1da177e4 | 1163 | */ |
4a3ad20c | 1164 | struct device *get_device(struct device *dev) |
1da177e4 | 1165 | { |
b0d1f807 | 1166 | return dev ? kobj_to_dev(kobject_get(&dev->kobj)) : NULL; |
1da177e4 LT |
1167 | } |
1168 | ||
1da177e4 | 1169 | /** |
4a3ad20c GKH |
1170 | * put_device - decrement reference count. |
1171 | * @dev: device in question. | |
1da177e4 | 1172 | */ |
4a3ad20c | 1173 | void put_device(struct device *dev) |
1da177e4 | 1174 | { |
edfaa7c3 | 1175 | /* might_sleep(); */ |
1da177e4 LT |
1176 | if (dev) |
1177 | kobject_put(&dev->kobj); | |
1178 | } | |
1179 | ||
1da177e4 | 1180 | /** |
4a3ad20c GKH |
1181 | * device_del - delete device from system. |
1182 | * @dev: device. | |
1da177e4 | 1183 | * |
4a3ad20c GKH |
1184 | * This is the first part of the device unregistration |
1185 | * sequence. This removes the device from the lists we control | |
1186 | * from here, has it removed from the other driver model | |
1187 | * subsystems it was added to in device_add(), and removes it | |
1188 | * from the kobject hierarchy. | |
1da177e4 | 1189 | * |
4a3ad20c GKH |
1190 | * NOTE: this should be called manually _iff_ device_add() was |
1191 | * also called manually. | |
1da177e4 | 1192 | */ |
4a3ad20c | 1193 | void device_del(struct device *dev) |
1da177e4 | 1194 | { |
4a3ad20c | 1195 | struct device *parent = dev->parent; |
c47ed219 | 1196 | struct class_interface *class_intf; |
1da177e4 | 1197 | |
ec0676ee AS |
1198 | /* Notify clients of device removal. This call must come |
1199 | * before dpm_sysfs_remove(). | |
1200 | */ | |
1201 | if (dev->bus) | |
1202 | blocking_notifier_call_chain(&dev->bus->p->bus_notifier, | |
1203 | BUS_NOTIFY_DEL_DEVICE, dev); | |
3b98aeaf | 1204 | dpm_sysfs_remove(dev); |
1da177e4 | 1205 | if (parent) |
f791b8c8 | 1206 | klist_del(&dev->p->knode_parent); |
e105b8bf | 1207 | if (MAJOR(dev->devt)) { |
2b2af54a | 1208 | devtmpfs_delete_node(dev); |
e105b8bf | 1209 | device_remove_sys_dev_entry(dev); |
ad6a1e1c | 1210 | device_remove_file(dev, &devt_attr); |
e105b8bf | 1211 | } |
b9d9c82b | 1212 | if (dev->class) { |
da231fd5 | 1213 | device_remove_class_symlinks(dev); |
99ef3ef8 | 1214 | |
ca22e56d | 1215 | mutex_lock(&dev->class->p->mutex); |
c47ed219 | 1216 | /* notify any interfaces that the device is now gone */ |
184f1f77 | 1217 | list_for_each_entry(class_intf, |
ca22e56d | 1218 | &dev->class->p->interfaces, node) |
c47ed219 GKH |
1219 | if (class_intf->remove_dev) |
1220 | class_intf->remove_dev(dev, class_intf); | |
1221 | /* remove the device from the class list */ | |
5a3ceb86 | 1222 | klist_del(&dev->knode_class); |
ca22e56d | 1223 | mutex_unlock(&dev->class->p->mutex); |
b9d9c82b | 1224 | } |
ad6a1e1c | 1225 | device_remove_file(dev, &uevent_attr); |
2620efef | 1226 | device_remove_attrs(dev); |
28953533 | 1227 | bus_remove_device(dev); |
4b6d1f12 | 1228 | device_pm_remove(dev); |
d1c3414c | 1229 | driver_deferred_probe_del(dev); |
1da177e4 LT |
1230 | |
1231 | /* Notify the platform of the removal, in case they | |
1232 | * need to do anything... | |
1233 | */ | |
1234 | if (platform_notify_remove) | |
1235 | platform_notify_remove(dev); | |
312c004d | 1236 | kobject_uevent(&dev->kobj, KOBJ_REMOVE); |
da231fd5 | 1237 | cleanup_device_parent(dev); |
1da177e4 | 1238 | kobject_del(&dev->kobj); |
da231fd5 | 1239 | put_device(parent); |
1da177e4 LT |
1240 | } |
1241 | ||
1242 | /** | |
4a3ad20c GKH |
1243 | * device_unregister - unregister device from system. |
1244 | * @dev: device going away. | |
1da177e4 | 1245 | * |
4a3ad20c GKH |
1246 | * We do this in two parts, like we do device_register(). First, |
1247 | * we remove it from all the subsystems with device_del(), then | |
1248 | * we decrement the reference count via put_device(). If that | |
1249 | * is the final reference count, the device will be cleaned up | |
1250 | * via device_release() above. Otherwise, the structure will | |
1251 | * stick around until the final reference to the device is dropped. | |
1da177e4 | 1252 | */ |
4a3ad20c | 1253 | void device_unregister(struct device *dev) |
1da177e4 | 1254 | { |
1e0b2cf9 | 1255 | pr_debug("device: '%s': %s\n", dev_name(dev), __func__); |
1da177e4 LT |
1256 | device_del(dev); |
1257 | put_device(dev); | |
1258 | } | |
1259 | ||
4a3ad20c | 1260 | static struct device *next_device(struct klist_iter *i) |
36239577 | 1261 | { |
4a3ad20c | 1262 | struct klist_node *n = klist_next(i); |
f791b8c8 GKH |
1263 | struct device *dev = NULL; |
1264 | struct device_private *p; | |
1265 | ||
1266 | if (n) { | |
1267 | p = to_device_private_parent(n); | |
1268 | dev = p->device; | |
1269 | } | |
1270 | return dev; | |
36239577 PM |
1271 | } |
1272 | ||
6fcf53ac | 1273 | /** |
e454cea2 | 1274 | * device_get_devnode - path of device node file |
6fcf53ac | 1275 | * @dev: device |
e454cea2 | 1276 | * @mode: returned file access mode |
6fcf53ac KS |
1277 | * @tmp: possibly allocated string |
1278 | * | |
1279 | * Return the relative path of a possible device node. | |
1280 | * Non-default names may need to allocate a memory to compose | |
1281 | * a name. This memory is returned in tmp and needs to be | |
1282 | * freed by the caller. | |
1283 | */ | |
e454cea2 | 1284 | const char *device_get_devnode(struct device *dev, |
2c9ede55 | 1285 | umode_t *mode, const char **tmp) |
6fcf53ac KS |
1286 | { |
1287 | char *s; | |
1288 | ||
1289 | *tmp = NULL; | |
1290 | ||
1291 | /* the device type may provide a specific name */ | |
e454cea2 KS |
1292 | if (dev->type && dev->type->devnode) |
1293 | *tmp = dev->type->devnode(dev, mode); | |
6fcf53ac KS |
1294 | if (*tmp) |
1295 | return *tmp; | |
1296 | ||
1297 | /* the class may provide a specific name */ | |
e454cea2 KS |
1298 | if (dev->class && dev->class->devnode) |
1299 | *tmp = dev->class->devnode(dev, mode); | |
6fcf53ac KS |
1300 | if (*tmp) |
1301 | return *tmp; | |
1302 | ||
1303 | /* return name without allocation, tmp == NULL */ | |
1304 | if (strchr(dev_name(dev), '!') == NULL) | |
1305 | return dev_name(dev); | |
1306 | ||
1307 | /* replace '!' in the name with '/' */ | |
1308 | *tmp = kstrdup(dev_name(dev), GFP_KERNEL); | |
1309 | if (!*tmp) | |
1310 | return NULL; | |
1311 | while ((s = strchr(*tmp, '!'))) | |
1312 | s[0] = '/'; | |
1313 | return *tmp; | |
1314 | } | |
1315 | ||
1da177e4 | 1316 | /** |
4a3ad20c GKH |
1317 | * device_for_each_child - device child iterator. |
1318 | * @parent: parent struct device. | |
1319 | * @data: data for the callback. | |
1320 | * @fn: function to be called for each device. | |
1da177e4 | 1321 | * |
4a3ad20c GKH |
1322 | * Iterate over @parent's child devices, and call @fn for each, |
1323 | * passing it @data. | |
1da177e4 | 1324 | * |
4a3ad20c GKH |
1325 | * We check the return of @fn each time. If it returns anything |
1326 | * other than 0, we break out and return that value. | |
1da177e4 | 1327 | */ |
4a3ad20c GKH |
1328 | int device_for_each_child(struct device *parent, void *data, |
1329 | int (*fn)(struct device *dev, void *data)) | |
1da177e4 | 1330 | { |
36239577 | 1331 | struct klist_iter i; |
4a3ad20c | 1332 | struct device *child; |
1da177e4 LT |
1333 | int error = 0; |
1334 | ||
014c90db GKH |
1335 | if (!parent->p) |
1336 | return 0; | |
1337 | ||
f791b8c8 | 1338 | klist_iter_init(&parent->p->klist_children, &i); |
36239577 PM |
1339 | while ((child = next_device(&i)) && !error) |
1340 | error = fn(child, data); | |
1341 | klist_iter_exit(&i); | |
1da177e4 LT |
1342 | return error; |
1343 | } | |
1344 | ||
5ab69981 CH |
1345 | /** |
1346 | * device_find_child - device iterator for locating a particular device. | |
1347 | * @parent: parent struct device | |
1348 | * @data: Data to pass to match function | |
1349 | * @match: Callback function to check device | |
1350 | * | |
1351 | * This is similar to the device_for_each_child() function above, but it | |
1352 | * returns a reference to a device that is 'found' for later use, as | |
1353 | * determined by the @match callback. | |
1354 | * | |
1355 | * The callback should return 0 if the device doesn't match and non-zero | |
1356 | * if it does. If the callback returns non-zero and a reference to the | |
1357 | * current device can be obtained, this function will return to the caller | |
1358 | * and not iterate over any more devices. | |
1359 | */ | |
4a3ad20c GKH |
1360 | struct device *device_find_child(struct device *parent, void *data, |
1361 | int (*match)(struct device *dev, void *data)) | |
5ab69981 CH |
1362 | { |
1363 | struct klist_iter i; | |
1364 | struct device *child; | |
1365 | ||
1366 | if (!parent) | |
1367 | return NULL; | |
1368 | ||
f791b8c8 | 1369 | klist_iter_init(&parent->p->klist_children, &i); |
5ab69981 CH |
1370 | while ((child = next_device(&i))) |
1371 | if (match(child, data) && get_device(child)) | |
1372 | break; | |
1373 | klist_iter_exit(&i); | |
1374 | return child; | |
1375 | } | |
1376 | ||
1da177e4 LT |
1377 | int __init devices_init(void) |
1378 | { | |
881c6cfd GKH |
1379 | devices_kset = kset_create_and_add("devices", &device_uevent_ops, NULL); |
1380 | if (!devices_kset) | |
1381 | return -ENOMEM; | |
e105b8bf DW |
1382 | dev_kobj = kobject_create_and_add("dev", NULL); |
1383 | if (!dev_kobj) | |
1384 | goto dev_kobj_err; | |
1385 | sysfs_dev_block_kobj = kobject_create_and_add("block", dev_kobj); | |
1386 | if (!sysfs_dev_block_kobj) | |
1387 | goto block_kobj_err; | |
1388 | sysfs_dev_char_kobj = kobject_create_and_add("char", dev_kobj); | |
1389 | if (!sysfs_dev_char_kobj) | |
1390 | goto char_kobj_err; | |
1391 | ||
881c6cfd | 1392 | return 0; |
e105b8bf DW |
1393 | |
1394 | char_kobj_err: | |
1395 | kobject_put(sysfs_dev_block_kobj); | |
1396 | block_kobj_err: | |
1397 | kobject_put(dev_kobj); | |
1398 | dev_kobj_err: | |
1399 | kset_unregister(devices_kset); | |
1400 | return -ENOMEM; | |
1da177e4 LT |
1401 | } |
1402 | ||
1403 | EXPORT_SYMBOL_GPL(device_for_each_child); | |
5ab69981 | 1404 | EXPORT_SYMBOL_GPL(device_find_child); |
1da177e4 LT |
1405 | |
1406 | EXPORT_SYMBOL_GPL(device_initialize); | |
1407 | EXPORT_SYMBOL_GPL(device_add); | |
1408 | EXPORT_SYMBOL_GPL(device_register); | |
1409 | ||
1410 | EXPORT_SYMBOL_GPL(device_del); | |
1411 | EXPORT_SYMBOL_GPL(device_unregister); | |
1412 | EXPORT_SYMBOL_GPL(get_device); | |
1413 | EXPORT_SYMBOL_GPL(put_device); | |
1da177e4 LT |
1414 | |
1415 | EXPORT_SYMBOL_GPL(device_create_file); | |
1416 | EXPORT_SYMBOL_GPL(device_remove_file); | |
23681e47 | 1417 | |
7f100d15 | 1418 | struct root_device { |
0aa0dc41 MM |
1419 | struct device dev; |
1420 | struct module *owner; | |
1421 | }; | |
1422 | ||
93058424 | 1423 | static inline struct root_device *to_root_device(struct device *d) |
481e2079 FW |
1424 | { |
1425 | return container_of(d, struct root_device, dev); | |
1426 | } | |
0aa0dc41 MM |
1427 | |
1428 | static void root_device_release(struct device *dev) | |
1429 | { | |
1430 | kfree(to_root_device(dev)); | |
1431 | } | |
1432 | ||
1433 | /** | |
1434 | * __root_device_register - allocate and register a root device | |
1435 | * @name: root device name | |
1436 | * @owner: owner module of the root device, usually THIS_MODULE | |
1437 | * | |
1438 | * This function allocates a root device and registers it | |
1439 | * using device_register(). In order to free the returned | |
1440 | * device, use root_device_unregister(). | |
1441 | * | |
1442 | * Root devices are dummy devices which allow other devices | |
1443 | * to be grouped under /sys/devices. Use this function to | |
1444 | * allocate a root device and then use it as the parent of | |
1445 | * any device which should appear under /sys/devices/{name} | |
1446 | * | |
1447 | * The /sys/devices/{name} directory will also contain a | |
1448 | * 'module' symlink which points to the @owner directory | |
1449 | * in sysfs. | |
1450 | * | |
f0eae0ed JN |
1451 | * Returns &struct device pointer on success, or ERR_PTR() on error. |
1452 | * | |
0aa0dc41 MM |
1453 | * Note: You probably want to use root_device_register(). |
1454 | */ | |
1455 | struct device *__root_device_register(const char *name, struct module *owner) | |
1456 | { | |
1457 | struct root_device *root; | |
1458 | int err = -ENOMEM; | |
1459 | ||
1460 | root = kzalloc(sizeof(struct root_device), GFP_KERNEL); | |
1461 | if (!root) | |
1462 | return ERR_PTR(err); | |
1463 | ||
acc0e90f | 1464 | err = dev_set_name(&root->dev, "%s", name); |
0aa0dc41 MM |
1465 | if (err) { |
1466 | kfree(root); | |
1467 | return ERR_PTR(err); | |
1468 | } | |
1469 | ||
1470 | root->dev.release = root_device_release; | |
1471 | ||
1472 | err = device_register(&root->dev); | |
1473 | if (err) { | |
1474 | put_device(&root->dev); | |
1475 | return ERR_PTR(err); | |
1476 | } | |
1477 | ||
1d9e882b | 1478 | #ifdef CONFIG_MODULES /* gotta find a "cleaner" way to do this */ |
0aa0dc41 MM |
1479 | if (owner) { |
1480 | struct module_kobject *mk = &owner->mkobj; | |
1481 | ||
1482 | err = sysfs_create_link(&root->dev.kobj, &mk->kobj, "module"); | |
1483 | if (err) { | |
1484 | device_unregister(&root->dev); | |
1485 | return ERR_PTR(err); | |
1486 | } | |
1487 | root->owner = owner; | |
1488 | } | |
1489 | #endif | |
1490 | ||
1491 | return &root->dev; | |
1492 | } | |
1493 | EXPORT_SYMBOL_GPL(__root_device_register); | |
1494 | ||
1495 | /** | |
1496 | * root_device_unregister - unregister and free a root device | |
7cbcf225 | 1497 | * @dev: device going away |
0aa0dc41 MM |
1498 | * |
1499 | * This function unregisters and cleans up a device that was created by | |
1500 | * root_device_register(). | |
1501 | */ | |
1502 | void root_device_unregister(struct device *dev) | |
1503 | { | |
1504 | struct root_device *root = to_root_device(dev); | |
1505 | ||
1506 | if (root->owner) | |
1507 | sysfs_remove_link(&root->dev.kobj, "module"); | |
1508 | ||
1509 | device_unregister(dev); | |
1510 | } | |
1511 | EXPORT_SYMBOL_GPL(root_device_unregister); | |
1512 | ||
23681e47 GKH |
1513 | |
1514 | static void device_create_release(struct device *dev) | |
1515 | { | |
1e0b2cf9 | 1516 | pr_debug("device: '%s': %s\n", dev_name(dev), __func__); |
23681e47 GKH |
1517 | kfree(dev); |
1518 | } | |
1519 | ||
1520 | /** | |
8882b394 | 1521 | * device_create_vargs - creates a device and registers it with sysfs |
42734daf HK |
1522 | * @class: pointer to the struct class that this device should be registered to |
1523 | * @parent: pointer to the parent struct device of this new device, if any | |
1524 | * @devt: the dev_t for the char device to be added | |
8882b394 | 1525 | * @drvdata: the data to be added to the device for callbacks |
42734daf | 1526 | * @fmt: string for the device's name |
8882b394 | 1527 | * @args: va_list for the device's name |
42734daf HK |
1528 | * |
1529 | * This function can be used by char device classes. A struct device | |
1530 | * will be created in sysfs, registered to the specified class. | |
23681e47 | 1531 | * |
23681e47 GKH |
1532 | * A "dev" file will be created, showing the dev_t for the device, if |
1533 | * the dev_t is not 0,0. | |
42734daf HK |
1534 | * If a pointer to a parent struct device is passed in, the newly created |
1535 | * struct device will be a child of that device in sysfs. | |
1536 | * The pointer to the struct device will be returned from the call. | |
1537 | * Any further sysfs files that might be required can be created using this | |
23681e47 GKH |
1538 | * pointer. |
1539 | * | |
f0eae0ed JN |
1540 | * Returns &struct device pointer on success, or ERR_PTR() on error. |
1541 | * | |
23681e47 GKH |
1542 | * Note: the struct class passed to this function must have previously |
1543 | * been created with a call to class_create(). | |
1544 | */ | |
8882b394 GKH |
1545 | struct device *device_create_vargs(struct class *class, struct device *parent, |
1546 | dev_t devt, void *drvdata, const char *fmt, | |
1547 | va_list args) | |
23681e47 | 1548 | { |
23681e47 GKH |
1549 | struct device *dev = NULL; |
1550 | int retval = -ENODEV; | |
1551 | ||
1552 | if (class == NULL || IS_ERR(class)) | |
1553 | goto error; | |
23681e47 GKH |
1554 | |
1555 | dev = kzalloc(sizeof(*dev), GFP_KERNEL); | |
1556 | if (!dev) { | |
1557 | retval = -ENOMEM; | |
1558 | goto error; | |
1559 | } | |
1560 | ||
1561 | dev->devt = devt; | |
1562 | dev->class = class; | |
1563 | dev->parent = parent; | |
1564 | dev->release = device_create_release; | |
8882b394 | 1565 | dev_set_drvdata(dev, drvdata); |
23681e47 | 1566 | |
1fa5ae85 KS |
1567 | retval = kobject_set_name_vargs(&dev->kobj, fmt, args); |
1568 | if (retval) | |
1569 | goto error; | |
1570 | ||
23681e47 GKH |
1571 | retval = device_register(dev); |
1572 | if (retval) | |
1573 | goto error; | |
1574 | ||
23681e47 GKH |
1575 | return dev; |
1576 | ||
1577 | error: | |
286661b3 | 1578 | put_device(dev); |
23681e47 GKH |
1579 | return ERR_PTR(retval); |
1580 | } | |
8882b394 GKH |
1581 | EXPORT_SYMBOL_GPL(device_create_vargs); |
1582 | ||
1583 | /** | |
4e106739 | 1584 | * device_create - creates a device and registers it with sysfs |
8882b394 GKH |
1585 | * @class: pointer to the struct class that this device should be registered to |
1586 | * @parent: pointer to the parent struct device of this new device, if any | |
1587 | * @devt: the dev_t for the char device to be added | |
1588 | * @drvdata: the data to be added to the device for callbacks | |
1589 | * @fmt: string for the device's name | |
1590 | * | |
1591 | * This function can be used by char device classes. A struct device | |
1592 | * will be created in sysfs, registered to the specified class. | |
1593 | * | |
1594 | * A "dev" file will be created, showing the dev_t for the device, if | |
1595 | * the dev_t is not 0,0. | |
1596 | * If a pointer to a parent struct device is passed in, the newly created | |
1597 | * struct device will be a child of that device in sysfs. | |
1598 | * The pointer to the struct device will be returned from the call. | |
1599 | * Any further sysfs files that might be required can be created using this | |
1600 | * pointer. | |
1601 | * | |
f0eae0ed JN |
1602 | * Returns &struct device pointer on success, or ERR_PTR() on error. |
1603 | * | |
8882b394 GKH |
1604 | * Note: the struct class passed to this function must have previously |
1605 | * been created with a call to class_create(). | |
1606 | */ | |
4e106739 GKH |
1607 | struct device *device_create(struct class *class, struct device *parent, |
1608 | dev_t devt, void *drvdata, const char *fmt, ...) | |
8882b394 GKH |
1609 | { |
1610 | va_list vargs; | |
1611 | struct device *dev; | |
1612 | ||
1613 | va_start(vargs, fmt); | |
1614 | dev = device_create_vargs(class, parent, devt, drvdata, fmt, vargs); | |
1615 | va_end(vargs); | |
1616 | return dev; | |
1617 | } | |
4e106739 | 1618 | EXPORT_SYMBOL_GPL(device_create); |
8882b394 | 1619 | |
cd35449b | 1620 | static int __match_devt(struct device *dev, void *data) |
23681e47 | 1621 | { |
cd35449b | 1622 | dev_t *devt = data; |
23681e47 | 1623 | |
cd35449b | 1624 | return dev->devt == *devt; |
775b64d2 RW |
1625 | } |
1626 | ||
1627 | /** | |
1628 | * device_destroy - removes a device that was created with device_create() | |
1629 | * @class: pointer to the struct class that this device was registered with | |
1630 | * @devt: the dev_t of the device that was previously registered | |
1631 | * | |
1632 | * This call unregisters and cleans up a device that was created with a | |
1633 | * call to device_create(). | |
1634 | */ | |
1635 | void device_destroy(struct class *class, dev_t devt) | |
1636 | { | |
1637 | struct device *dev; | |
23681e47 | 1638 | |
695794ae | 1639 | dev = class_find_device(class, NULL, &devt, __match_devt); |
cd35449b DY |
1640 | if (dev) { |
1641 | put_device(dev); | |
23681e47 | 1642 | device_unregister(dev); |
cd35449b | 1643 | } |
23681e47 GKH |
1644 | } |
1645 | EXPORT_SYMBOL_GPL(device_destroy); | |
a2de48ca GKH |
1646 | |
1647 | /** | |
1648 | * device_rename - renames a device | |
1649 | * @dev: the pointer to the struct device to be renamed | |
1650 | * @new_name: the new name of the device | |
030c1d2b EB |
1651 | * |
1652 | * It is the responsibility of the caller to provide mutual | |
1653 | * exclusion between two different calls of device_rename | |
1654 | * on the same device to ensure that new_name is valid and | |
1655 | * won't conflict with other devices. | |
c6c0ac66 | 1656 | * |
a5462516 TT |
1657 | * Note: Don't call this function. Currently, the networking layer calls this |
1658 | * function, but that will change. The following text from Kay Sievers offers | |
1659 | * some insight: | |
1660 | * | |
1661 | * Renaming devices is racy at many levels, symlinks and other stuff are not | |
1662 | * replaced atomically, and you get a "move" uevent, but it's not easy to | |
1663 | * connect the event to the old and new device. Device nodes are not renamed at | |
1664 | * all, there isn't even support for that in the kernel now. | |
1665 | * | |
1666 | * In the meantime, during renaming, your target name might be taken by another | |
1667 | * driver, creating conflicts. Or the old name is taken directly after you | |
1668 | * renamed it -- then you get events for the same DEVPATH, before you even see | |
1669 | * the "move" event. It's just a mess, and nothing new should ever rely on | |
1670 | * kernel device renaming. Besides that, it's not even implemented now for | |
1671 | * other things than (driver-core wise very simple) network devices. | |
1672 | * | |
1673 | * We are currently about to change network renaming in udev to completely | |
1674 | * disallow renaming of devices in the same namespace as the kernel uses, | |
1675 | * because we can't solve the problems properly, that arise with swapping names | |
1676 | * of multiple interfaces without races. Means, renaming of eth[0-9]* will only | |
1677 | * be allowed to some other name than eth[0-9]*, for the aforementioned | |
1678 | * reasons. | |
1679 | * | |
1680 | * Make up a "real" name in the driver before you register anything, or add | |
1681 | * some other attributes for userspace to find the device, or use udev to add | |
1682 | * symlinks -- but never rename kernel devices later, it's a complete mess. We | |
1683 | * don't even want to get into that and try to implement the missing pieces in | |
1684 | * the core. We really have other pieces to fix in the driver core mess. :) | |
a2de48ca | 1685 | */ |
6937e8f8 | 1686 | int device_rename(struct device *dev, const char *new_name) |
a2de48ca GKH |
1687 | { |
1688 | char *old_class_name = NULL; | |
1689 | char *new_class_name = NULL; | |
2ee97caf | 1690 | char *old_device_name = NULL; |
a2de48ca GKH |
1691 | int error; |
1692 | ||
1693 | dev = get_device(dev); | |
1694 | if (!dev) | |
1695 | return -EINVAL; | |
1696 | ||
1e0b2cf9 | 1697 | pr_debug("device: '%s': %s: renaming to '%s'\n", dev_name(dev), |
2b3a302a | 1698 | __func__, new_name); |
a2de48ca | 1699 | |
1fa5ae85 | 1700 | old_device_name = kstrdup(dev_name(dev), GFP_KERNEL); |
2ee97caf CH |
1701 | if (!old_device_name) { |
1702 | error = -ENOMEM; | |
1703 | goto out; | |
a2de48ca | 1704 | } |
a2de48ca | 1705 | |
f349cf34 | 1706 | if (dev->class) { |
6b6e39a6 | 1707 | error = sysfs_rename_link(&dev->class->p->subsys.kobj, |
f349cf34 EB |
1708 | &dev->kobj, old_device_name, new_name); |
1709 | if (error) | |
1710 | goto out; | |
1711 | } | |
39aba963 | 1712 | |
a2de48ca | 1713 | error = kobject_rename(&dev->kobj, new_name); |
1fa5ae85 | 1714 | if (error) |
2ee97caf | 1715 | goto out; |
a2de48ca | 1716 | |
2ee97caf | 1717 | out: |
a2de48ca GKH |
1718 | put_device(dev); |
1719 | ||
a2de48ca | 1720 | kfree(new_class_name); |
952ab431 | 1721 | kfree(old_class_name); |
2ee97caf | 1722 | kfree(old_device_name); |
a2de48ca GKH |
1723 | |
1724 | return error; | |
1725 | } | |
a2807dbc | 1726 | EXPORT_SYMBOL_GPL(device_rename); |
8a82472f CH |
1727 | |
1728 | static int device_move_class_links(struct device *dev, | |
1729 | struct device *old_parent, | |
1730 | struct device *new_parent) | |
1731 | { | |
f7f3461d | 1732 | int error = 0; |
8a82472f | 1733 | |
f7f3461d GKH |
1734 | if (old_parent) |
1735 | sysfs_remove_link(&dev->kobj, "device"); | |
1736 | if (new_parent) | |
1737 | error = sysfs_create_link(&dev->kobj, &new_parent->kobj, | |
1738 | "device"); | |
1739 | return error; | |
8a82472f CH |
1740 | } |
1741 | ||
1742 | /** | |
1743 | * device_move - moves a device to a new parent | |
1744 | * @dev: the pointer to the struct device to be moved | |
c744aeae | 1745 | * @new_parent: the new parent of the device (can by NULL) |
ffa6a705 | 1746 | * @dpm_order: how to reorder the dpm_list |
8a82472f | 1747 | */ |
ffa6a705 CH |
1748 | int device_move(struct device *dev, struct device *new_parent, |
1749 | enum dpm_order dpm_order) | |
8a82472f CH |
1750 | { |
1751 | int error; | |
1752 | struct device *old_parent; | |
c744aeae | 1753 | struct kobject *new_parent_kobj; |
8a82472f CH |
1754 | |
1755 | dev = get_device(dev); | |
1756 | if (!dev) | |
1757 | return -EINVAL; | |
1758 | ||
ffa6a705 | 1759 | device_pm_lock(); |
8a82472f | 1760 | new_parent = get_device(new_parent); |
4a3ad20c | 1761 | new_parent_kobj = get_device_parent(dev, new_parent); |
63b6971a | 1762 | |
1e0b2cf9 KS |
1763 | pr_debug("device: '%s': %s: moving to '%s'\n", dev_name(dev), |
1764 | __func__, new_parent ? dev_name(new_parent) : "<NULL>"); | |
c744aeae | 1765 | error = kobject_move(&dev->kobj, new_parent_kobj); |
8a82472f | 1766 | if (error) { |
63b6971a | 1767 | cleanup_glue_dir(dev, new_parent_kobj); |
8a82472f CH |
1768 | put_device(new_parent); |
1769 | goto out; | |
1770 | } | |
1771 | old_parent = dev->parent; | |
1772 | dev->parent = new_parent; | |
1773 | if (old_parent) | |
f791b8c8 | 1774 | klist_remove(&dev->p->knode_parent); |
0d358f22 | 1775 | if (new_parent) { |
f791b8c8 GKH |
1776 | klist_add_tail(&dev->p->knode_parent, |
1777 | &new_parent->p->klist_children); | |
0d358f22 YL |
1778 | set_dev_node(dev, dev_to_node(new_parent)); |
1779 | } | |
1780 | ||
bdd4034d RV |
1781 | if (dev->class) { |
1782 | error = device_move_class_links(dev, old_parent, new_parent); | |
1783 | if (error) { | |
1784 | /* We ignore errors on cleanup since we're hosed anyway... */ | |
1785 | device_move_class_links(dev, new_parent, old_parent); | |
1786 | if (!kobject_move(&dev->kobj, &old_parent->kobj)) { | |
1787 | if (new_parent) | |
1788 | klist_remove(&dev->p->knode_parent); | |
1789 | dev->parent = old_parent; | |
1790 | if (old_parent) { | |
1791 | klist_add_tail(&dev->p->knode_parent, | |
1792 | &old_parent->p->klist_children); | |
1793 | set_dev_node(dev, dev_to_node(old_parent)); | |
1794 | } | |
0d358f22 | 1795 | } |
bdd4034d RV |
1796 | cleanup_glue_dir(dev, new_parent_kobj); |
1797 | put_device(new_parent); | |
1798 | goto out; | |
8a82472f | 1799 | } |
8a82472f | 1800 | } |
ffa6a705 CH |
1801 | switch (dpm_order) { |
1802 | case DPM_ORDER_NONE: | |
1803 | break; | |
1804 | case DPM_ORDER_DEV_AFTER_PARENT: | |
1805 | device_pm_move_after(dev, new_parent); | |
1806 | break; | |
1807 | case DPM_ORDER_PARENT_BEFORE_DEV: | |
1808 | device_pm_move_before(new_parent, dev); | |
1809 | break; | |
1810 | case DPM_ORDER_DEV_LAST: | |
1811 | device_pm_move_last(dev); | |
1812 | break; | |
1813 | } | |
bdd4034d | 1814 | |
8a82472f CH |
1815 | put_device(old_parent); |
1816 | out: | |
ffa6a705 | 1817 | device_pm_unlock(); |
8a82472f CH |
1818 | put_device(dev); |
1819 | return error; | |
1820 | } | |
8a82472f | 1821 | EXPORT_SYMBOL_GPL(device_move); |
37b0c020 GKH |
1822 | |
1823 | /** | |
1824 | * device_shutdown - call ->shutdown() on each device to shutdown. | |
1825 | */ | |
1826 | void device_shutdown(void) | |
1827 | { | |
6245838f HD |
1828 | struct device *dev; |
1829 | ||
1830 | spin_lock(&devices_kset->list_lock); | |
1831 | /* | |
1832 | * Walk the devices list backward, shutting down each in turn. | |
1833 | * Beware that device unplug events may also start pulling | |
1834 | * devices offline, even as the system is shutting down. | |
1835 | */ | |
1836 | while (!list_empty(&devices_kset->list)) { | |
1837 | dev = list_entry(devices_kset->list.prev, struct device, | |
1838 | kobj.entry); | |
d1c6c030 ML |
1839 | |
1840 | /* | |
1841 | * hold reference count of device's parent to | |
1842 | * prevent it from being freed because parent's | |
1843 | * lock is to be held | |
1844 | */ | |
1845 | get_device(dev->parent); | |
6245838f HD |
1846 | get_device(dev); |
1847 | /* | |
1848 | * Make sure the device is off the kset list, in the | |
1849 | * event that dev->*->shutdown() doesn't remove it. | |
1850 | */ | |
1851 | list_del_init(&dev->kobj.entry); | |
1852 | spin_unlock(&devices_kset->list_lock); | |
fe6b91f4 | 1853 | |
d1c6c030 ML |
1854 | /* hold lock to avoid race with probe/release */ |
1855 | if (dev->parent) | |
1856 | device_lock(dev->parent); | |
1857 | device_lock(dev); | |
1858 | ||
fe6b91f4 AS |
1859 | /* Don't allow any more runtime suspends */ |
1860 | pm_runtime_get_noresume(dev); | |
1861 | pm_runtime_barrier(dev); | |
37b0c020 | 1862 | |
37b0c020 | 1863 | if (dev->bus && dev->bus->shutdown) { |
0246c4fa SL |
1864 | if (initcall_debug) |
1865 | dev_info(dev, "shutdown\n"); | |
37b0c020 GKH |
1866 | dev->bus->shutdown(dev); |
1867 | } else if (dev->driver && dev->driver->shutdown) { | |
0246c4fa SL |
1868 | if (initcall_debug) |
1869 | dev_info(dev, "shutdown\n"); | |
37b0c020 GKH |
1870 | dev->driver->shutdown(dev); |
1871 | } | |
d1c6c030 ML |
1872 | |
1873 | device_unlock(dev); | |
1874 | if (dev->parent) | |
1875 | device_unlock(dev->parent); | |
1876 | ||
6245838f | 1877 | put_device(dev); |
d1c6c030 | 1878 | put_device(dev->parent); |
6245838f HD |
1879 | |
1880 | spin_lock(&devices_kset->list_lock); | |
37b0c020 | 1881 | } |
6245838f | 1882 | spin_unlock(&devices_kset->list_lock); |
401097ea | 1883 | async_synchronize_full(); |
37b0c020 | 1884 | } |
99bcf217 JP |
1885 | |
1886 | /* | |
1887 | * Device logging functions | |
1888 | */ | |
1889 | ||
1890 | #ifdef CONFIG_PRINTK | |
666f355f JP |
1891 | static int |
1892 | create_syslog_header(const struct device *dev, char *hdr, size_t hdrlen) | |
99bcf217 | 1893 | { |
c4e00daa | 1894 | const char *subsys; |
798efc60 | 1895 | size_t pos = 0; |
99bcf217 | 1896 | |
c4e00daa KS |
1897 | if (dev->class) |
1898 | subsys = dev->class->name; | |
1899 | else if (dev->bus) | |
1900 | subsys = dev->bus->name; | |
1901 | else | |
798efc60 | 1902 | return 0; |
c4e00daa | 1903 | |
798efc60 | 1904 | pos += snprintf(hdr + pos, hdrlen - pos, "SUBSYSTEM=%s", subsys); |
c4e00daa KS |
1905 | |
1906 | /* | |
1907 | * Add device identifier DEVICE=: | |
1908 | * b12:8 block dev_t | |
1909 | * c127:3 char dev_t | |
1910 | * n8 netdev ifindex | |
1911 | * +sound:card0 subsystem:devname | |
1912 | */ | |
1913 | if (MAJOR(dev->devt)) { | |
1914 | char c; | |
1915 | ||
1916 | if (strcmp(subsys, "block") == 0) | |
1917 | c = 'b'; | |
1918 | else | |
1919 | c = 'c'; | |
798efc60 JP |
1920 | pos++; |
1921 | pos += snprintf(hdr + pos, hdrlen - pos, | |
1922 | "DEVICE=%c%u:%u", | |
1923 | c, MAJOR(dev->devt), MINOR(dev->devt)); | |
c4e00daa KS |
1924 | } else if (strcmp(subsys, "net") == 0) { |
1925 | struct net_device *net = to_net_dev(dev); | |
1926 | ||
798efc60 JP |
1927 | pos++; |
1928 | pos += snprintf(hdr + pos, hdrlen - pos, | |
1929 | "DEVICE=n%u", net->ifindex); | |
c4e00daa | 1930 | } else { |
798efc60 JP |
1931 | pos++; |
1932 | pos += snprintf(hdr + pos, hdrlen - pos, | |
1933 | "DEVICE=+%s:%s", subsys, dev_name(dev)); | |
c4e00daa | 1934 | } |
af7f2158 | 1935 | |
798efc60 JP |
1936 | return pos; |
1937 | } | |
1938 | EXPORT_SYMBOL(create_syslog_header); | |
1939 | ||
05e4e5b8 JP |
1940 | int dev_vprintk_emit(int level, const struct device *dev, |
1941 | const char *fmt, va_list args) | |
1942 | { | |
1943 | char hdr[128]; | |
1944 | size_t hdrlen; | |
1945 | ||
1946 | hdrlen = create_syslog_header(dev, hdr, sizeof(hdr)); | |
1947 | ||
1948 | return vprintk_emit(0, level, hdrlen ? hdr : NULL, hdrlen, fmt, args); | |
1949 | } | |
1950 | EXPORT_SYMBOL(dev_vprintk_emit); | |
1951 | ||
1952 | int dev_printk_emit(int level, const struct device *dev, const char *fmt, ...) | |
1953 | { | |
1954 | va_list args; | |
1955 | int r; | |
1956 | ||
1957 | va_start(args, fmt); | |
1958 | ||
1959 | r = dev_vprintk_emit(level, dev, fmt, args); | |
1960 | ||
1961 | va_end(args); | |
1962 | ||
1963 | return r; | |
1964 | } | |
1965 | EXPORT_SYMBOL(dev_printk_emit); | |
1966 | ||
798efc60 JP |
1967 | static int __dev_printk(const char *level, const struct device *dev, |
1968 | struct va_format *vaf) | |
1969 | { | |
798efc60 JP |
1970 | if (!dev) |
1971 | return printk("%s(NULL device *): %pV", level, vaf); | |
1972 | ||
666f355f JP |
1973 | return dev_printk_emit(level[1] - '0', dev, |
1974 | "%s %s: %pV", | |
1975 | dev_driver_string(dev), dev_name(dev), vaf); | |
99bcf217 JP |
1976 | } |
1977 | ||
1978 | int dev_printk(const char *level, const struct device *dev, | |
1979 | const char *fmt, ...) | |
1980 | { | |
1981 | struct va_format vaf; | |
1982 | va_list args; | |
1983 | int r; | |
1984 | ||
1985 | va_start(args, fmt); | |
1986 | ||
1987 | vaf.fmt = fmt; | |
1988 | vaf.va = &args; | |
1989 | ||
1990 | r = __dev_printk(level, dev, &vaf); | |
798efc60 | 1991 | |
99bcf217 JP |
1992 | va_end(args); |
1993 | ||
1994 | return r; | |
1995 | } | |
1996 | EXPORT_SYMBOL(dev_printk); | |
1997 | ||
1998 | #define define_dev_printk_level(func, kern_level) \ | |
1999 | int func(const struct device *dev, const char *fmt, ...) \ | |
2000 | { \ | |
2001 | struct va_format vaf; \ | |
2002 | va_list args; \ | |
2003 | int r; \ | |
2004 | \ | |
2005 | va_start(args, fmt); \ | |
2006 | \ | |
2007 | vaf.fmt = fmt; \ | |
2008 | vaf.va = &args; \ | |
2009 | \ | |
2010 | r = __dev_printk(kern_level, dev, &vaf); \ | |
798efc60 | 2011 | \ |
99bcf217 JP |
2012 | va_end(args); \ |
2013 | \ | |
2014 | return r; \ | |
2015 | } \ | |
2016 | EXPORT_SYMBOL(func); | |
2017 | ||
2018 | define_dev_printk_level(dev_emerg, KERN_EMERG); | |
2019 | define_dev_printk_level(dev_alert, KERN_ALERT); | |
2020 | define_dev_printk_level(dev_crit, KERN_CRIT); | |
2021 | define_dev_printk_level(dev_err, KERN_ERR); | |
2022 | define_dev_printk_level(dev_warn, KERN_WARNING); | |
2023 | define_dev_printk_level(dev_notice, KERN_NOTICE); | |
2024 | define_dev_printk_level(_dev_info, KERN_INFO); | |
2025 | ||
2026 | #endif |