Commit | Line | Data |
---|---|---|
1da177e4 LT |
1 | /* |
2 | * drivers/base/core.c - core driver model code (device registration, etc) | |
3 | * | |
4 | * Copyright (c) 2002-3 Patrick Mochel | |
5 | * Copyright (c) 2002-3 Open Source Development Labs | |
64bb5d2c GKH |
6 | * Copyright (c) 2006 Greg Kroah-Hartman <gregkh@suse.de> |
7 | * Copyright (c) 2006 Novell, Inc. | |
1da177e4 LT |
8 | * |
9 | * This file is released under the GPLv2 | |
10 | * | |
11 | */ | |
12 | ||
1da177e4 LT |
13 | #include <linux/device.h> |
14 | #include <linux/err.h> | |
15 | #include <linux/init.h> | |
16 | #include <linux/module.h> | |
17 | #include <linux/slab.h> | |
18 | #include <linux/string.h> | |
23681e47 | 19 | #include <linux/kdev_t.h> |
116af378 | 20 | #include <linux/notifier.h> |
07d57a32 GL |
21 | #include <linux/of.h> |
22 | #include <linux/of_device.h> | |
da231fd5 | 23 | #include <linux/genhd.h> |
815d2d50 | 24 | #include <linux/kallsyms.h> |
f75b1c60 | 25 | #include <linux/mutex.h> |
401097ea | 26 | #include <linux/async.h> |
af8db150 | 27 | #include <linux/pm_runtime.h> |
c4e00daa | 28 | #include <linux/netdevice.h> |
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(obj) container_of(obj, struct device, kobj) |
89 | #define to_dev_attr(_attr) container_of(_attr, struct device_attribute, attr) | |
90 | ||
4a3ad20c GKH |
91 | static ssize_t dev_attr_show(struct kobject *kobj, struct attribute *attr, |
92 | char *buf) | |
1da177e4 | 93 | { |
4a3ad20c GKH |
94 | struct device_attribute *dev_attr = to_dev_attr(attr); |
95 | struct device *dev = to_dev(kobj); | |
4a0c20bf | 96 | ssize_t ret = -EIO; |
1da177e4 LT |
97 | |
98 | if (dev_attr->show) | |
54b6f35c | 99 | ret = dev_attr->show(dev, dev_attr, buf); |
815d2d50 AM |
100 | if (ret >= (ssize_t)PAGE_SIZE) { |
101 | print_symbol("dev_attr_show: %s returned bad count\n", | |
102 | (unsigned long)dev_attr->show); | |
103 | } | |
1da177e4 LT |
104 | return ret; |
105 | } | |
106 | ||
4a3ad20c GKH |
107 | static ssize_t dev_attr_store(struct kobject *kobj, struct attribute *attr, |
108 | const char *buf, size_t count) | |
1da177e4 | 109 | { |
4a3ad20c GKH |
110 | struct device_attribute *dev_attr = to_dev_attr(attr); |
111 | struct device *dev = to_dev(kobj); | |
4a0c20bf | 112 | ssize_t ret = -EIO; |
1da177e4 LT |
113 | |
114 | if (dev_attr->store) | |
54b6f35c | 115 | ret = dev_attr->store(dev, dev_attr, buf, count); |
1da177e4 LT |
116 | return ret; |
117 | } | |
118 | ||
52cf25d0 | 119 | static const struct sysfs_ops dev_sysfs_ops = { |
1da177e4 LT |
120 | .show = dev_attr_show, |
121 | .store = dev_attr_store, | |
122 | }; | |
123 | ||
ca22e56d KS |
124 | #define to_ext_attr(x) container_of(x, struct dev_ext_attribute, attr) |
125 | ||
126 | ssize_t device_store_ulong(struct device *dev, | |
127 | struct device_attribute *attr, | |
128 | const char *buf, size_t size) | |
129 | { | |
130 | struct dev_ext_attribute *ea = to_ext_attr(attr); | |
131 | char *end; | |
132 | unsigned long new = simple_strtoul(buf, &end, 0); | |
133 | if (end == buf) | |
134 | return -EINVAL; | |
135 | *(unsigned long *)(ea->var) = new; | |
136 | /* Always return full write size even if we didn't consume all */ | |
137 | return size; | |
138 | } | |
139 | EXPORT_SYMBOL_GPL(device_store_ulong); | |
140 | ||
141 | ssize_t device_show_ulong(struct device *dev, | |
142 | struct device_attribute *attr, | |
143 | char *buf) | |
144 | { | |
145 | struct dev_ext_attribute *ea = to_ext_attr(attr); | |
146 | return snprintf(buf, PAGE_SIZE, "%lx\n", *(unsigned long *)(ea->var)); | |
147 | } | |
148 | EXPORT_SYMBOL_GPL(device_show_ulong); | |
149 | ||
150 | ssize_t device_store_int(struct device *dev, | |
151 | struct device_attribute *attr, | |
152 | const char *buf, size_t size) | |
153 | { | |
154 | struct dev_ext_attribute *ea = to_ext_attr(attr); | |
155 | char *end; | |
156 | long new = simple_strtol(buf, &end, 0); | |
157 | if (end == buf || new > INT_MAX || new < INT_MIN) | |
158 | return -EINVAL; | |
159 | *(int *)(ea->var) = new; | |
160 | /* Always return full write size even if we didn't consume all */ | |
161 | return size; | |
162 | } | |
163 | EXPORT_SYMBOL_GPL(device_store_int); | |
164 | ||
165 | ssize_t device_show_int(struct device *dev, | |
166 | struct device_attribute *attr, | |
167 | char *buf) | |
168 | { | |
169 | struct dev_ext_attribute *ea = to_ext_attr(attr); | |
170 | ||
171 | return snprintf(buf, PAGE_SIZE, "%d\n", *(int *)(ea->var)); | |
172 | } | |
173 | EXPORT_SYMBOL_GPL(device_show_int); | |
1da177e4 LT |
174 | |
175 | /** | |
176 | * device_release - free device structure. | |
177 | * @kobj: device's kobject. | |
178 | * | |
179 | * This is called once the reference count for the object | |
180 | * reaches 0. We forward the call to the device's release | |
181 | * method, which should handle actually freeing the structure. | |
182 | */ | |
4a3ad20c | 183 | static void device_release(struct kobject *kobj) |
1da177e4 | 184 | { |
4a3ad20c | 185 | struct device *dev = to_dev(kobj); |
fb069a5d | 186 | struct device_private *p = dev->p; |
1da177e4 LT |
187 | |
188 | if (dev->release) | |
189 | dev->release(dev); | |
f9f852df KS |
190 | else if (dev->type && dev->type->release) |
191 | dev->type->release(dev); | |
2620efef GKH |
192 | else if (dev->class && dev->class->dev_release) |
193 | dev->class->dev_release(dev); | |
f810a5cf AV |
194 | else |
195 | WARN(1, KERN_ERR "Device '%s' does not have a release() " | |
4a3ad20c | 196 | "function, it is broken and must be fixed.\n", |
1e0b2cf9 | 197 | dev_name(dev)); |
fb069a5d | 198 | kfree(p); |
1da177e4 LT |
199 | } |
200 | ||
bc451f20 EB |
201 | static const void *device_namespace(struct kobject *kobj) |
202 | { | |
203 | struct device *dev = to_dev(kobj); | |
204 | const void *ns = NULL; | |
205 | ||
206 | if (dev->class && dev->class->ns_type) | |
207 | ns = dev->class->namespace(dev); | |
208 | ||
209 | return ns; | |
210 | } | |
211 | ||
8f4afc41 | 212 | static struct kobj_type device_ktype = { |
1da177e4 LT |
213 | .release = device_release, |
214 | .sysfs_ops = &dev_sysfs_ops, | |
bc451f20 | 215 | .namespace = device_namespace, |
1da177e4 LT |
216 | }; |
217 | ||
218 | ||
312c004d | 219 | static int dev_uevent_filter(struct kset *kset, struct kobject *kobj) |
1da177e4 LT |
220 | { |
221 | struct kobj_type *ktype = get_ktype(kobj); | |
222 | ||
8f4afc41 | 223 | if (ktype == &device_ktype) { |
1da177e4 LT |
224 | struct device *dev = to_dev(kobj); |
225 | if (dev->bus) | |
226 | return 1; | |
23681e47 GKH |
227 | if (dev->class) |
228 | return 1; | |
1da177e4 LT |
229 | } |
230 | return 0; | |
231 | } | |
232 | ||
312c004d | 233 | static const char *dev_uevent_name(struct kset *kset, struct kobject *kobj) |
1da177e4 LT |
234 | { |
235 | struct device *dev = to_dev(kobj); | |
236 | ||
23681e47 GKH |
237 | if (dev->bus) |
238 | return dev->bus->name; | |
239 | if (dev->class) | |
240 | return dev->class->name; | |
241 | return NULL; | |
1da177e4 LT |
242 | } |
243 | ||
7eff2e7a KS |
244 | static int dev_uevent(struct kset *kset, struct kobject *kobj, |
245 | struct kobj_uevent_env *env) | |
1da177e4 LT |
246 | { |
247 | struct device *dev = to_dev(kobj); | |
1da177e4 LT |
248 | int retval = 0; |
249 | ||
6fcf53ac | 250 | /* add device node properties if present */ |
23681e47 | 251 | if (MAJOR(dev->devt)) { |
6fcf53ac KS |
252 | const char *tmp; |
253 | const char *name; | |
2c9ede55 | 254 | umode_t mode = 0; |
6fcf53ac | 255 | |
7eff2e7a KS |
256 | add_uevent_var(env, "MAJOR=%u", MAJOR(dev->devt)); |
257 | add_uevent_var(env, "MINOR=%u", MINOR(dev->devt)); | |
e454cea2 | 258 | name = device_get_devnode(dev, &mode, &tmp); |
6fcf53ac KS |
259 | if (name) { |
260 | add_uevent_var(env, "DEVNAME=%s", name); | |
261 | kfree(tmp); | |
e454cea2 KS |
262 | if (mode) |
263 | add_uevent_var(env, "DEVMODE=%#o", mode & 0777); | |
6fcf53ac | 264 | } |
23681e47 GKH |
265 | } |
266 | ||
414264f9 | 267 | if (dev->type && dev->type->name) |
7eff2e7a | 268 | add_uevent_var(env, "DEVTYPE=%s", dev->type->name); |
414264f9 | 269 | |
239378f1 | 270 | if (dev->driver) |
7eff2e7a | 271 | add_uevent_var(env, "DRIVER=%s", dev->driver->name); |
239378f1 | 272 | |
07d57a32 GL |
273 | /* Add common DT information about the device */ |
274 | of_device_uevent(dev, env); | |
275 | ||
7eff2e7a | 276 | /* have the bus specific function add its stuff */ |
312c004d | 277 | if (dev->bus && dev->bus->uevent) { |
7eff2e7a | 278 | retval = dev->bus->uevent(dev, env); |
f9f852df | 279 | if (retval) |
7dc72b28 | 280 | pr_debug("device: '%s': %s: bus uevent() returned %d\n", |
1e0b2cf9 | 281 | dev_name(dev), __func__, retval); |
1da177e4 LT |
282 | } |
283 | ||
7eff2e7a | 284 | /* have the class specific function add its stuff */ |
2620efef | 285 | if (dev->class && dev->class->dev_uevent) { |
7eff2e7a | 286 | retval = dev->class->dev_uevent(dev, env); |
f9f852df | 287 | if (retval) |
7dc72b28 | 288 | pr_debug("device: '%s': %s: class uevent() " |
1e0b2cf9 | 289 | "returned %d\n", dev_name(dev), |
2b3a302a | 290 | __func__, retval); |
f9f852df KS |
291 | } |
292 | ||
eef35c2d | 293 | /* have the device type specific function add its stuff */ |
f9f852df | 294 | if (dev->type && dev->type->uevent) { |
7eff2e7a | 295 | retval = dev->type->uevent(dev, env); |
f9f852df | 296 | if (retval) |
7dc72b28 | 297 | pr_debug("device: '%s': %s: dev_type uevent() " |
1e0b2cf9 | 298 | "returned %d\n", dev_name(dev), |
2b3a302a | 299 | __func__, retval); |
2620efef GKH |
300 | } |
301 | ||
1da177e4 LT |
302 | return retval; |
303 | } | |
304 | ||
9cd43611 | 305 | static const struct kset_uevent_ops device_uevent_ops = { |
312c004d KS |
306 | .filter = dev_uevent_filter, |
307 | .name = dev_uevent_name, | |
308 | .uevent = dev_uevent, | |
1da177e4 LT |
309 | }; |
310 | ||
16574dcc KS |
311 | static ssize_t show_uevent(struct device *dev, struct device_attribute *attr, |
312 | char *buf) | |
313 | { | |
314 | struct kobject *top_kobj; | |
315 | struct kset *kset; | |
7eff2e7a | 316 | struct kobj_uevent_env *env = NULL; |
16574dcc KS |
317 | int i; |
318 | size_t count = 0; | |
319 | int retval; | |
320 | ||
321 | /* search the kset, the device belongs to */ | |
322 | top_kobj = &dev->kobj; | |
5c5daf65 KS |
323 | while (!top_kobj->kset && top_kobj->parent) |
324 | top_kobj = top_kobj->parent; | |
16574dcc KS |
325 | if (!top_kobj->kset) |
326 | goto out; | |
5c5daf65 | 327 | |
16574dcc KS |
328 | kset = top_kobj->kset; |
329 | if (!kset->uevent_ops || !kset->uevent_ops->uevent) | |
330 | goto out; | |
331 | ||
332 | /* respect filter */ | |
333 | if (kset->uevent_ops && kset->uevent_ops->filter) | |
334 | if (!kset->uevent_ops->filter(kset, &dev->kobj)) | |
335 | goto out; | |
336 | ||
7eff2e7a KS |
337 | env = kzalloc(sizeof(struct kobj_uevent_env), GFP_KERNEL); |
338 | if (!env) | |
c7308c81 GKH |
339 | return -ENOMEM; |
340 | ||
16574dcc | 341 | /* let the kset specific function add its keys */ |
7eff2e7a | 342 | retval = kset->uevent_ops->uevent(kset, &dev->kobj, env); |
16574dcc KS |
343 | if (retval) |
344 | goto out; | |
345 | ||
346 | /* copy keys to file */ | |
7eff2e7a KS |
347 | for (i = 0; i < env->envp_idx; i++) |
348 | count += sprintf(&buf[count], "%s\n", env->envp[i]); | |
16574dcc | 349 | out: |
7eff2e7a | 350 | kfree(env); |
16574dcc KS |
351 | return count; |
352 | } | |
353 | ||
a7fd6706 KS |
354 | static ssize_t store_uevent(struct device *dev, struct device_attribute *attr, |
355 | const char *buf, size_t count) | |
356 | { | |
60a96a59 KS |
357 | enum kobject_action action; |
358 | ||
3f5468c9 | 359 | if (kobject_action_type(buf, count, &action) == 0) |
60a96a59 | 360 | kobject_uevent(&dev->kobj, action); |
3f5468c9 KS |
361 | else |
362 | dev_err(dev, "uevent: unknown action-string\n"); | |
a7fd6706 KS |
363 | return count; |
364 | } | |
365 | ||
ad6a1e1c TH |
366 | static struct device_attribute uevent_attr = |
367 | __ATTR(uevent, S_IRUGO | S_IWUSR, show_uevent, store_uevent); | |
368 | ||
621a1672 DT |
369 | static int device_add_attributes(struct device *dev, |
370 | struct device_attribute *attrs) | |
de0ff00d | 371 | { |
621a1672 | 372 | int error = 0; |
de0ff00d | 373 | int i; |
621a1672 DT |
374 | |
375 | if (attrs) { | |
376 | for (i = 0; attr_name(attrs[i]); i++) { | |
377 | error = device_create_file(dev, &attrs[i]); | |
378 | if (error) | |
379 | break; | |
380 | } | |
381 | if (error) | |
382 | while (--i >= 0) | |
383 | device_remove_file(dev, &attrs[i]); | |
384 | } | |
385 | return error; | |
386 | } | |
387 | ||
388 | static void device_remove_attributes(struct device *dev, | |
389 | struct device_attribute *attrs) | |
390 | { | |
391 | int i; | |
392 | ||
393 | if (attrs) | |
394 | for (i = 0; attr_name(attrs[i]); i++) | |
395 | device_remove_file(dev, &attrs[i]); | |
396 | } | |
397 | ||
c97415a7 SA |
398 | static int device_add_bin_attributes(struct device *dev, |
399 | struct bin_attribute *attrs) | |
400 | { | |
401 | int error = 0; | |
402 | int i; | |
403 | ||
404 | if (attrs) { | |
405 | for (i = 0; attr_name(attrs[i]); i++) { | |
406 | error = device_create_bin_file(dev, &attrs[i]); | |
407 | if (error) | |
408 | break; | |
409 | } | |
410 | if (error) | |
411 | while (--i >= 0) | |
412 | device_remove_bin_file(dev, &attrs[i]); | |
413 | } | |
414 | return error; | |
415 | } | |
416 | ||
417 | static void device_remove_bin_attributes(struct device *dev, | |
418 | struct bin_attribute *attrs) | |
419 | { | |
420 | int i; | |
421 | ||
422 | if (attrs) | |
423 | for (i = 0; attr_name(attrs[i]); i++) | |
424 | device_remove_bin_file(dev, &attrs[i]); | |
425 | } | |
426 | ||
621a1672 | 427 | static int device_add_groups(struct device *dev, |
a4dbd674 | 428 | const struct attribute_group **groups) |
621a1672 | 429 | { |
de0ff00d | 430 | int error = 0; |
621a1672 | 431 | int i; |
de0ff00d | 432 | |
621a1672 DT |
433 | if (groups) { |
434 | for (i = 0; groups[i]; i++) { | |
435 | error = sysfs_create_group(&dev->kobj, groups[i]); | |
de0ff00d GKH |
436 | if (error) { |
437 | while (--i >= 0) | |
4a3ad20c GKH |
438 | sysfs_remove_group(&dev->kobj, |
439 | groups[i]); | |
621a1672 | 440 | break; |
de0ff00d GKH |
441 | } |
442 | } | |
443 | } | |
de0ff00d GKH |
444 | return error; |
445 | } | |
446 | ||
621a1672 | 447 | static void device_remove_groups(struct device *dev, |
a4dbd674 | 448 | const struct attribute_group **groups) |
de0ff00d GKH |
449 | { |
450 | int i; | |
621a1672 DT |
451 | |
452 | if (groups) | |
453 | for (i = 0; groups[i]; i++) | |
454 | sysfs_remove_group(&dev->kobj, groups[i]); | |
de0ff00d GKH |
455 | } |
456 | ||
2620efef GKH |
457 | static int device_add_attrs(struct device *dev) |
458 | { | |
459 | struct class *class = dev->class; | |
aed65af1 | 460 | const struct device_type *type = dev->type; |
621a1672 | 461 | int error; |
2620efef | 462 | |
621a1672 DT |
463 | if (class) { |
464 | error = device_add_attributes(dev, class->dev_attrs); | |
f9f852df | 465 | if (error) |
621a1672 | 466 | return error; |
c97415a7 SA |
467 | error = device_add_bin_attributes(dev, class->dev_bin_attrs); |
468 | if (error) | |
469 | goto err_remove_class_attrs; | |
2620efef | 470 | } |
f9f852df | 471 | |
621a1672 DT |
472 | if (type) { |
473 | error = device_add_groups(dev, type->groups); | |
f9f852df | 474 | if (error) |
c97415a7 | 475 | goto err_remove_class_bin_attrs; |
f9f852df KS |
476 | } |
477 | ||
621a1672 DT |
478 | error = device_add_groups(dev, dev->groups); |
479 | if (error) | |
480 | goto err_remove_type_groups; | |
481 | ||
482 | return 0; | |
483 | ||
484 | err_remove_type_groups: | |
485 | if (type) | |
486 | device_remove_groups(dev, type->groups); | |
c97415a7 SA |
487 | err_remove_class_bin_attrs: |
488 | if (class) | |
489 | device_remove_bin_attributes(dev, class->dev_bin_attrs); | |
621a1672 DT |
490 | err_remove_class_attrs: |
491 | if (class) | |
492 | device_remove_attributes(dev, class->dev_attrs); | |
493 | ||
2620efef GKH |
494 | return error; |
495 | } | |
496 | ||
497 | static void device_remove_attrs(struct device *dev) | |
498 | { | |
499 | struct class *class = dev->class; | |
aed65af1 | 500 | const struct device_type *type = dev->type; |
2620efef | 501 | |
621a1672 | 502 | device_remove_groups(dev, dev->groups); |
f9f852df | 503 | |
621a1672 DT |
504 | if (type) |
505 | device_remove_groups(dev, type->groups); | |
506 | ||
c97415a7 | 507 | if (class) { |
621a1672 | 508 | device_remove_attributes(dev, class->dev_attrs); |
c97415a7 SA |
509 | device_remove_bin_attributes(dev, class->dev_bin_attrs); |
510 | } | |
2620efef GKH |
511 | } |
512 | ||
513 | ||
23681e47 GKH |
514 | static ssize_t show_dev(struct device *dev, struct device_attribute *attr, |
515 | char *buf) | |
516 | { | |
517 | return print_dev_t(buf, dev->devt); | |
518 | } | |
519 | ||
ad6a1e1c TH |
520 | static struct device_attribute devt_attr = |
521 | __ATTR(dev, S_IRUGO, show_dev, NULL); | |
522 | ||
ca22e56d | 523 | /* /sys/devices/ */ |
881c6cfd | 524 | struct kset *devices_kset; |
1da177e4 | 525 | |
1da177e4 | 526 | /** |
4a3ad20c GKH |
527 | * device_create_file - create sysfs attribute file for device. |
528 | * @dev: device. | |
529 | * @attr: device attribute descriptor. | |
1da177e4 | 530 | */ |
26579ab7 PC |
531 | int device_create_file(struct device *dev, |
532 | const struct device_attribute *attr) | |
1da177e4 LT |
533 | { |
534 | int error = 0; | |
0c98b19f | 535 | if (dev) |
1da177e4 | 536 | error = sysfs_create_file(&dev->kobj, &attr->attr); |
1da177e4 LT |
537 | return error; |
538 | } | |
539 | ||
540 | /** | |
4a3ad20c GKH |
541 | * device_remove_file - remove sysfs attribute file. |
542 | * @dev: device. | |
543 | * @attr: device attribute descriptor. | |
1da177e4 | 544 | */ |
26579ab7 PC |
545 | void device_remove_file(struct device *dev, |
546 | const struct device_attribute *attr) | |
1da177e4 | 547 | { |
0c98b19f | 548 | if (dev) |
1da177e4 | 549 | sysfs_remove_file(&dev->kobj, &attr->attr); |
1da177e4 LT |
550 | } |
551 | ||
2589f188 GKH |
552 | /** |
553 | * device_create_bin_file - create sysfs binary attribute file for device. | |
554 | * @dev: device. | |
555 | * @attr: device binary attribute descriptor. | |
556 | */ | |
66ecb92b PC |
557 | int device_create_bin_file(struct device *dev, |
558 | const struct bin_attribute *attr) | |
2589f188 GKH |
559 | { |
560 | int error = -EINVAL; | |
561 | if (dev) | |
562 | error = sysfs_create_bin_file(&dev->kobj, attr); | |
563 | return error; | |
564 | } | |
565 | EXPORT_SYMBOL_GPL(device_create_bin_file); | |
566 | ||
567 | /** | |
568 | * device_remove_bin_file - remove sysfs binary attribute file | |
569 | * @dev: device. | |
570 | * @attr: device binary attribute descriptor. | |
571 | */ | |
66ecb92b PC |
572 | void device_remove_bin_file(struct device *dev, |
573 | const struct bin_attribute *attr) | |
2589f188 GKH |
574 | { |
575 | if (dev) | |
576 | sysfs_remove_bin_file(&dev->kobj, attr); | |
577 | } | |
578 | EXPORT_SYMBOL_GPL(device_remove_bin_file); | |
579 | ||
d9a9cdfb | 580 | /** |
523ded71 | 581 | * device_schedule_callback_owner - helper to schedule a callback for a device |
d9a9cdfb AS |
582 | * @dev: device. |
583 | * @func: callback function to invoke later. | |
523ded71 | 584 | * @owner: module owning the callback routine |
d9a9cdfb AS |
585 | * |
586 | * Attribute methods must not unregister themselves or their parent device | |
587 | * (which would amount to the same thing). Attempts to do so will deadlock, | |
588 | * since unregistration is mutually exclusive with driver callbacks. | |
589 | * | |
590 | * Instead methods can call this routine, which will attempt to allocate | |
591 | * and schedule a workqueue request to call back @func with @dev as its | |
592 | * argument in the workqueue's process context. @dev will be pinned until | |
593 | * @func returns. | |
594 | * | |
523ded71 AS |
595 | * This routine is usually called via the inline device_schedule_callback(), |
596 | * which automatically sets @owner to THIS_MODULE. | |
597 | * | |
d9a9cdfb | 598 | * Returns 0 if the request was submitted, -ENOMEM if storage could not |
523ded71 | 599 | * be allocated, -ENODEV if a reference to @owner isn't available. |
d9a9cdfb AS |
600 | * |
601 | * NOTE: This routine won't work if CONFIG_SYSFS isn't set! It uses an | |
602 | * underlying sysfs routine (since it is intended for use by attribute | |
603 | * methods), and if sysfs isn't available you'll get nothing but -ENOSYS. | |
604 | */ | |
523ded71 AS |
605 | int device_schedule_callback_owner(struct device *dev, |
606 | void (*func)(struct device *), struct module *owner) | |
d9a9cdfb AS |
607 | { |
608 | return sysfs_schedule_callback(&dev->kobj, | |
523ded71 | 609 | (void (*)(void *)) func, dev, owner); |
d9a9cdfb | 610 | } |
523ded71 | 611 | EXPORT_SYMBOL_GPL(device_schedule_callback_owner); |
d9a9cdfb | 612 | |
34bb61f9 JB |
613 | static void klist_children_get(struct klist_node *n) |
614 | { | |
f791b8c8 GKH |
615 | struct device_private *p = to_device_private_parent(n); |
616 | struct device *dev = p->device; | |
34bb61f9 JB |
617 | |
618 | get_device(dev); | |
619 | } | |
620 | ||
621 | static void klist_children_put(struct klist_node *n) | |
622 | { | |
f791b8c8 GKH |
623 | struct device_private *p = to_device_private_parent(n); |
624 | struct device *dev = p->device; | |
34bb61f9 JB |
625 | |
626 | put_device(dev); | |
627 | } | |
628 | ||
1da177e4 | 629 | /** |
4a3ad20c GKH |
630 | * device_initialize - init device structure. |
631 | * @dev: device. | |
1da177e4 | 632 | * |
5739411a CH |
633 | * This prepares the device for use by other layers by initializing |
634 | * its fields. | |
4a3ad20c | 635 | * It is the first half of device_register(), if called by |
5739411a CH |
636 | * that function, though it can also be called separately, so one |
637 | * may use @dev's fields. In particular, get_device()/put_device() | |
638 | * may be used for reference counting of @dev after calling this | |
639 | * function. | |
640 | * | |
b10d5efd AS |
641 | * All fields in @dev must be initialized by the caller to 0, except |
642 | * for those explicitly set to some other value. The simplest | |
643 | * approach is to use kzalloc() to allocate the structure containing | |
644 | * @dev. | |
645 | * | |
5739411a CH |
646 | * NOTE: Use put_device() to give up your reference instead of freeing |
647 | * @dev directly once you have called this function. | |
1da177e4 | 648 | */ |
1da177e4 LT |
649 | void device_initialize(struct device *dev) |
650 | { | |
881c6cfd | 651 | dev->kobj.kset = devices_kset; |
f9cb074b | 652 | kobject_init(&dev->kobj, &device_ktype); |
1da177e4 | 653 | INIT_LIST_HEAD(&dev->dma_pools); |
3142788b | 654 | mutex_init(&dev->mutex); |
1704f47b | 655 | lockdep_set_novalidate_class(&dev->mutex); |
9ac7849e TH |
656 | spin_lock_init(&dev->devres_lock); |
657 | INIT_LIST_HEAD(&dev->devres_head); | |
3b98aeaf | 658 | device_pm_init(dev); |
87348136 | 659 | set_dev_node(dev, -1); |
1da177e4 LT |
660 | } |
661 | ||
86406245 | 662 | static struct kobject *virtual_device_parent(struct device *dev) |
f0ee61a6 | 663 | { |
86406245 | 664 | static struct kobject *virtual_dir = NULL; |
f0ee61a6 | 665 | |
86406245 | 666 | if (!virtual_dir) |
4ff6abff | 667 | virtual_dir = kobject_create_and_add("virtual", |
881c6cfd | 668 | &devices_kset->kobj); |
f0ee61a6 | 669 | |
86406245 | 670 | return virtual_dir; |
f0ee61a6 GKH |
671 | } |
672 | ||
bc451f20 EB |
673 | struct class_dir { |
674 | struct kobject kobj; | |
675 | struct class *class; | |
676 | }; | |
677 | ||
678 | #define to_class_dir(obj) container_of(obj, struct class_dir, kobj) | |
679 | ||
680 | static void class_dir_release(struct kobject *kobj) | |
681 | { | |
682 | struct class_dir *dir = to_class_dir(kobj); | |
683 | kfree(dir); | |
684 | } | |
685 | ||
686 | static const | |
687 | struct kobj_ns_type_operations *class_dir_child_ns_type(struct kobject *kobj) | |
40fa5422 | 688 | { |
bc451f20 EB |
689 | struct class_dir *dir = to_class_dir(kobj); |
690 | return dir->class->ns_type; | |
691 | } | |
692 | ||
693 | static struct kobj_type class_dir_ktype = { | |
694 | .release = class_dir_release, | |
695 | .sysfs_ops = &kobj_sysfs_ops, | |
696 | .child_ns_type = class_dir_child_ns_type | |
697 | }; | |
698 | ||
699 | static struct kobject * | |
700 | class_dir_create_and_add(struct class *class, struct kobject *parent_kobj) | |
701 | { | |
702 | struct class_dir *dir; | |
43968d2f GKH |
703 | int retval; |
704 | ||
bc451f20 EB |
705 | dir = kzalloc(sizeof(*dir), GFP_KERNEL); |
706 | if (!dir) | |
707 | return NULL; | |
708 | ||
709 | dir->class = class; | |
710 | kobject_init(&dir->kobj, &class_dir_ktype); | |
711 | ||
6b6e39a6 | 712 | dir->kobj.kset = &class->p->glue_dirs; |
bc451f20 EB |
713 | |
714 | retval = kobject_add(&dir->kobj, parent_kobj, "%s", class->name); | |
715 | if (retval < 0) { | |
716 | kobject_put(&dir->kobj); | |
717 | return NULL; | |
718 | } | |
719 | return &dir->kobj; | |
720 | } | |
721 | ||
722 | ||
723 | static struct kobject *get_device_parent(struct device *dev, | |
724 | struct device *parent) | |
725 | { | |
86406245 | 726 | if (dev->class) { |
77d3d7c1 | 727 | static DEFINE_MUTEX(gdp_mutex); |
86406245 KS |
728 | struct kobject *kobj = NULL; |
729 | struct kobject *parent_kobj; | |
730 | struct kobject *k; | |
731 | ||
ead454fe | 732 | #ifdef CONFIG_BLOCK |
39aba963 | 733 | /* block disks show up in /sys/block */ |
e52eec13 | 734 | if (sysfs_deprecated && dev->class == &block_class) { |
39aba963 KS |
735 | if (parent && parent->class == &block_class) |
736 | return &parent->kobj; | |
6b6e39a6 | 737 | return &block_class.p->subsys.kobj; |
39aba963 | 738 | } |
ead454fe | 739 | #endif |
e52eec13 | 740 | |
86406245 KS |
741 | /* |
742 | * If we have no parent, we live in "virtual". | |
0f4dafc0 KS |
743 | * Class-devices with a non class-device as parent, live |
744 | * in a "glue" directory to prevent namespace collisions. | |
86406245 KS |
745 | */ |
746 | if (parent == NULL) | |
747 | parent_kobj = virtual_device_parent(dev); | |
24b1442d | 748 | else if (parent->class && !dev->class->ns_type) |
86406245 KS |
749 | return &parent->kobj; |
750 | else | |
751 | parent_kobj = &parent->kobj; | |
752 | ||
77d3d7c1 TH |
753 | mutex_lock(&gdp_mutex); |
754 | ||
86406245 | 755 | /* find our class-directory at the parent and reference it */ |
6b6e39a6 KS |
756 | spin_lock(&dev->class->p->glue_dirs.list_lock); |
757 | list_for_each_entry(k, &dev->class->p->glue_dirs.list, entry) | |
86406245 KS |
758 | if (k->parent == parent_kobj) { |
759 | kobj = kobject_get(k); | |
760 | break; | |
761 | } | |
6b6e39a6 | 762 | spin_unlock(&dev->class->p->glue_dirs.list_lock); |
77d3d7c1 TH |
763 | if (kobj) { |
764 | mutex_unlock(&gdp_mutex); | |
86406245 | 765 | return kobj; |
77d3d7c1 | 766 | } |
86406245 KS |
767 | |
768 | /* or create a new class-directory at the parent device */ | |
bc451f20 | 769 | k = class_dir_create_and_add(dev->class, parent_kobj); |
0f4dafc0 | 770 | /* do not emit an uevent for this simple "glue" directory */ |
77d3d7c1 | 771 | mutex_unlock(&gdp_mutex); |
43968d2f | 772 | return k; |
86406245 KS |
773 | } |
774 | ||
ca22e56d KS |
775 | /* subsystems can specify a default root directory for their devices */ |
776 | if (!parent && dev->bus && dev->bus->dev_root) | |
777 | return &dev->bus->dev_root->kobj; | |
778 | ||
86406245 | 779 | if (parent) |
c744aeae CH |
780 | return &parent->kobj; |
781 | return NULL; | |
782 | } | |
da231fd5 | 783 | |
63b6971a | 784 | static void cleanup_glue_dir(struct device *dev, struct kobject *glue_dir) |
da231fd5 | 785 | { |
0f4dafc0 | 786 | /* see if we live in a "glue" directory */ |
c1fe539a | 787 | if (!glue_dir || !dev->class || |
6b6e39a6 | 788 | glue_dir->kset != &dev->class->p->glue_dirs) |
da231fd5 KS |
789 | return; |
790 | ||
0f4dafc0 | 791 | kobject_put(glue_dir); |
da231fd5 | 792 | } |
63b6971a CH |
793 | |
794 | static void cleanup_device_parent(struct device *dev) | |
795 | { | |
796 | cleanup_glue_dir(dev, dev->kobj.parent); | |
797 | } | |
86406245 | 798 | |
2ee97caf CH |
799 | static int device_add_class_symlinks(struct device *dev) |
800 | { | |
801 | int error; | |
802 | ||
803 | if (!dev->class) | |
804 | return 0; | |
da231fd5 | 805 | |
1fbfee6c | 806 | error = sysfs_create_link(&dev->kobj, |
6b6e39a6 | 807 | &dev->class->p->subsys.kobj, |
2ee97caf CH |
808 | "subsystem"); |
809 | if (error) | |
810 | goto out; | |
da231fd5 | 811 | |
4e886c29 | 812 | if (dev->parent && device_is_not_partition(dev)) { |
39aba963 | 813 | error = sysfs_create_link(&dev->kobj, &dev->parent->kobj, |
4f01a757 DT |
814 | "device"); |
815 | if (error) | |
39aba963 | 816 | goto out_subsys; |
2ee97caf | 817 | } |
2ee97caf | 818 | |
ead454fe | 819 | #ifdef CONFIG_BLOCK |
39aba963 | 820 | /* /sys/block has directories and does not need symlinks */ |
e52eec13 | 821 | if (sysfs_deprecated && dev->class == &block_class) |
39aba963 | 822 | return 0; |
ead454fe | 823 | #endif |
39aba963 | 824 | |
da231fd5 | 825 | /* link in the class directory pointing to the device */ |
6b6e39a6 | 826 | error = sysfs_create_link(&dev->class->p->subsys.kobj, |
1e0b2cf9 | 827 | &dev->kobj, dev_name(dev)); |
da231fd5 | 828 | if (error) |
39aba963 | 829 | goto out_device; |
da231fd5 | 830 | |
da231fd5 KS |
831 | return 0; |
832 | ||
39aba963 KS |
833 | out_device: |
834 | sysfs_remove_link(&dev->kobj, "device"); | |
da231fd5 | 835 | |
2ee97caf CH |
836 | out_subsys: |
837 | sysfs_remove_link(&dev->kobj, "subsystem"); | |
838 | out: | |
839 | return error; | |
840 | } | |
841 | ||
842 | static void device_remove_class_symlinks(struct device *dev) | |
843 | { | |
844 | if (!dev->class) | |
845 | return; | |
da231fd5 | 846 | |
4e886c29 | 847 | if (dev->parent && device_is_not_partition(dev)) |
da231fd5 | 848 | sysfs_remove_link(&dev->kobj, "device"); |
2ee97caf | 849 | sysfs_remove_link(&dev->kobj, "subsystem"); |
ead454fe | 850 | #ifdef CONFIG_BLOCK |
e52eec13 | 851 | if (sysfs_deprecated && dev->class == &block_class) |
39aba963 | 852 | return; |
ead454fe | 853 | #endif |
6b6e39a6 | 854 | sysfs_delete_link(&dev->class->p->subsys.kobj, &dev->kobj, dev_name(dev)); |
2ee97caf CH |
855 | } |
856 | ||
413c239f SR |
857 | /** |
858 | * dev_set_name - set a device name | |
859 | * @dev: device | |
46232366 | 860 | * @fmt: format string for the device's name |
413c239f SR |
861 | */ |
862 | int dev_set_name(struct device *dev, const char *fmt, ...) | |
863 | { | |
864 | va_list vargs; | |
1fa5ae85 | 865 | int err; |
413c239f SR |
866 | |
867 | va_start(vargs, fmt); | |
1fa5ae85 | 868 | err = kobject_set_name_vargs(&dev->kobj, fmt, vargs); |
413c239f | 869 | va_end(vargs); |
1fa5ae85 | 870 | return err; |
413c239f SR |
871 | } |
872 | EXPORT_SYMBOL_GPL(dev_set_name); | |
873 | ||
e105b8bf DW |
874 | /** |
875 | * device_to_dev_kobj - select a /sys/dev/ directory for the device | |
876 | * @dev: device | |
877 | * | |
878 | * By default we select char/ for new entries. Setting class->dev_obj | |
879 | * to NULL prevents an entry from being created. class->dev_kobj must | |
880 | * be set (or cleared) before any devices are registered to the class | |
881 | * otherwise device_create_sys_dev_entry() and | |
0d4e293c PK |
882 | * device_remove_sys_dev_entry() will disagree about the presence of |
883 | * the link. | |
e105b8bf DW |
884 | */ |
885 | static struct kobject *device_to_dev_kobj(struct device *dev) | |
886 | { | |
887 | struct kobject *kobj; | |
888 | ||
889 | if (dev->class) | |
890 | kobj = dev->class->dev_kobj; | |
891 | else | |
892 | kobj = sysfs_dev_char_kobj; | |
893 | ||
894 | return kobj; | |
895 | } | |
896 | ||
897 | static int device_create_sys_dev_entry(struct device *dev) | |
898 | { | |
899 | struct kobject *kobj = device_to_dev_kobj(dev); | |
900 | int error = 0; | |
901 | char devt_str[15]; | |
902 | ||
903 | if (kobj) { | |
904 | format_dev_t(devt_str, dev->devt); | |
905 | error = sysfs_create_link(kobj, &dev->kobj, devt_str); | |
906 | } | |
907 | ||
908 | return error; | |
909 | } | |
910 | ||
911 | static void device_remove_sys_dev_entry(struct device *dev) | |
912 | { | |
913 | struct kobject *kobj = device_to_dev_kobj(dev); | |
914 | char devt_str[15]; | |
915 | ||
916 | if (kobj) { | |
917 | format_dev_t(devt_str, dev->devt); | |
918 | sysfs_remove_link(kobj, devt_str); | |
919 | } | |
920 | } | |
921 | ||
b4028437 GKH |
922 | int device_private_init(struct device *dev) |
923 | { | |
924 | dev->p = kzalloc(sizeof(*dev->p), GFP_KERNEL); | |
925 | if (!dev->p) | |
926 | return -ENOMEM; | |
927 | dev->p->device = dev; | |
928 | klist_init(&dev->p->klist_children, klist_children_get, | |
929 | klist_children_put); | |
ef8a3fd6 | 930 | INIT_LIST_HEAD(&dev->p->deferred_probe); |
b4028437 GKH |
931 | return 0; |
932 | } | |
933 | ||
1da177e4 | 934 | /** |
4a3ad20c GKH |
935 | * device_add - add device to device hierarchy. |
936 | * @dev: device. | |
1da177e4 | 937 | * |
4a3ad20c GKH |
938 | * This is part 2 of device_register(), though may be called |
939 | * separately _iff_ device_initialize() has been called separately. | |
1da177e4 | 940 | * |
5739411a | 941 | * This adds @dev to the kobject hierarchy via kobject_add(), adds it |
4a3ad20c GKH |
942 | * to the global and sibling lists for the device, then |
943 | * adds it to the other relevant subsystems of the driver model. | |
5739411a | 944 | * |
b10d5efd AS |
945 | * Do not call this routine or device_register() more than once for |
946 | * any device structure. The driver model core is not designed to work | |
947 | * with devices that get unregistered and then spring back to life. | |
948 | * (Among other things, it's very hard to guarantee that all references | |
949 | * to the previous incarnation of @dev have been dropped.) Allocate | |
950 | * and register a fresh new struct device instead. | |
951 | * | |
5739411a CH |
952 | * NOTE: _Never_ directly free @dev after calling this function, even |
953 | * if it returned an error! Always use put_device() to give up your | |
954 | * reference instead. | |
1da177e4 LT |
955 | */ |
956 | int device_add(struct device *dev) | |
957 | { | |
958 | struct device *parent = NULL; | |
ca22e56d | 959 | struct kobject *kobj; |
c47ed219 | 960 | struct class_interface *class_intf; |
c906a48a | 961 | int error = -EINVAL; |
775b64d2 | 962 | |
1da177e4 | 963 | dev = get_device(dev); |
c906a48a GKH |
964 | if (!dev) |
965 | goto done; | |
966 | ||
fb069a5d | 967 | if (!dev->p) { |
b4028437 GKH |
968 | error = device_private_init(dev); |
969 | if (error) | |
970 | goto done; | |
fb069a5d | 971 | } |
fb069a5d | 972 | |
1fa5ae85 KS |
973 | /* |
974 | * for statically allocated devices, which should all be converted | |
975 | * some day, we need to initialize the name. We prevent reading back | |
976 | * the name, and force the use of dev_name() | |
977 | */ | |
978 | if (dev->init_name) { | |
acc0e90f | 979 | dev_set_name(dev, "%s", dev->init_name); |
1fa5ae85 KS |
980 | dev->init_name = NULL; |
981 | } | |
c906a48a | 982 | |
ca22e56d KS |
983 | /* subsystems can specify simple device enumeration */ |
984 | if (!dev_name(dev) && dev->bus && dev->bus->dev_name) | |
985 | dev_set_name(dev, "%s%u", dev->bus->dev_name, dev->id); | |
986 | ||
e6309e75 TG |
987 | if (!dev_name(dev)) { |
988 | error = -EINVAL; | |
5c8563d7 | 989 | goto name_error; |
e6309e75 | 990 | } |
1da177e4 | 991 | |
1e0b2cf9 | 992 | pr_debug("device: '%s': %s\n", dev_name(dev), __func__); |
c205ef48 | 993 | |
1da177e4 | 994 | parent = get_device(dev->parent); |
ca22e56d KS |
995 | kobj = get_device_parent(dev, parent); |
996 | if (kobj) | |
997 | dev->kobj.parent = kobj; | |
1da177e4 | 998 | |
0d358f22 YL |
999 | /* use parent numa_node */ |
1000 | if (parent) | |
1001 | set_dev_node(dev, dev_to_node(parent)); | |
1002 | ||
1da177e4 | 1003 | /* first, register with generic layer. */ |
8a577ffc KS |
1004 | /* we require the name to be set before, and pass NULL */ |
1005 | error = kobject_add(&dev->kobj, dev->kobj.parent, NULL); | |
40fa5422 | 1006 | if (error) |
1da177e4 | 1007 | goto Error; |
a7fd6706 | 1008 | |
37022644 BW |
1009 | /* notify platform of device entry */ |
1010 | if (platform_notify) | |
1011 | platform_notify(dev); | |
1012 | ||
ad6a1e1c | 1013 | error = device_create_file(dev, &uevent_attr); |
a306eea4 CH |
1014 | if (error) |
1015 | goto attrError; | |
a7fd6706 | 1016 | |
23681e47 | 1017 | if (MAJOR(dev->devt)) { |
ad6a1e1c TH |
1018 | error = device_create_file(dev, &devt_attr); |
1019 | if (error) | |
a306eea4 | 1020 | goto ueventattrError; |
e105b8bf DW |
1021 | |
1022 | error = device_create_sys_dev_entry(dev); | |
1023 | if (error) | |
1024 | goto devtattrError; | |
2b2af54a KS |
1025 | |
1026 | devtmpfs_create_node(dev); | |
23681e47 GKH |
1027 | } |
1028 | ||
2ee97caf CH |
1029 | error = device_add_class_symlinks(dev); |
1030 | if (error) | |
1031 | goto SymlinkError; | |
dc0afa83 CH |
1032 | error = device_add_attrs(dev); |
1033 | if (error) | |
2620efef | 1034 | goto AttrsError; |
dc0afa83 CH |
1035 | error = bus_add_device(dev); |
1036 | if (error) | |
1da177e4 | 1037 | goto BusError; |
3b98aeaf | 1038 | error = dpm_sysfs_add(dev); |
57eee3d2 | 1039 | if (error) |
3b98aeaf AS |
1040 | goto DPMError; |
1041 | device_pm_add(dev); | |
ec0676ee AS |
1042 | |
1043 | /* Notify clients of device addition. This call must come | |
268863f4 | 1044 | * after dpm_sysfs_add() and before kobject_uevent(). |
ec0676ee AS |
1045 | */ |
1046 | if (dev->bus) | |
1047 | blocking_notifier_call_chain(&dev->bus->p->bus_notifier, | |
1048 | BUS_NOTIFY_ADD_DEVICE, dev); | |
1049 | ||
83b5fb4c | 1050 | kobject_uevent(&dev->kobj, KOBJ_ADD); |
2023c610 | 1051 | bus_probe_device(dev); |
1da177e4 | 1052 | if (parent) |
f791b8c8 GKH |
1053 | klist_add_tail(&dev->p->knode_parent, |
1054 | &parent->p->klist_children); | |
1da177e4 | 1055 | |
5d9fd169 | 1056 | if (dev->class) { |
ca22e56d | 1057 | mutex_lock(&dev->class->p->mutex); |
c47ed219 | 1058 | /* tie the class to the device */ |
5a3ceb86 | 1059 | klist_add_tail(&dev->knode_class, |
6b6e39a6 | 1060 | &dev->class->p->klist_devices); |
c47ed219 GKH |
1061 | |
1062 | /* notify any interfaces that the device is here */ | |
184f1f77 | 1063 | list_for_each_entry(class_intf, |
ca22e56d | 1064 | &dev->class->p->interfaces, node) |
c47ed219 GKH |
1065 | if (class_intf->add_dev) |
1066 | class_intf->add_dev(dev, class_intf); | |
ca22e56d | 1067 | mutex_unlock(&dev->class->p->mutex); |
5d9fd169 | 1068 | } |
c906a48a | 1069 | done: |
1da177e4 LT |
1070 | put_device(dev); |
1071 | return error; | |
3b98aeaf | 1072 | DPMError: |
57eee3d2 RW |
1073 | bus_remove_device(dev); |
1074 | BusError: | |
82f0cf9b | 1075 | device_remove_attrs(dev); |
2620efef | 1076 | AttrsError: |
2ee97caf CH |
1077 | device_remove_class_symlinks(dev); |
1078 | SymlinkError: | |
ad72956d KS |
1079 | if (MAJOR(dev->devt)) |
1080 | devtmpfs_delete_node(dev); | |
e105b8bf DW |
1081 | if (MAJOR(dev->devt)) |
1082 | device_remove_sys_dev_entry(dev); | |
1083 | devtattrError: | |
ad6a1e1c TH |
1084 | if (MAJOR(dev->devt)) |
1085 | device_remove_file(dev, &devt_attr); | |
a306eea4 | 1086 | ueventattrError: |
ad6a1e1c | 1087 | device_remove_file(dev, &uevent_attr); |
23681e47 | 1088 | attrError: |
312c004d | 1089 | kobject_uevent(&dev->kobj, KOBJ_REMOVE); |
1da177e4 LT |
1090 | kobject_del(&dev->kobj); |
1091 | Error: | |
63b6971a | 1092 | cleanup_device_parent(dev); |
1da177e4 LT |
1093 | if (parent) |
1094 | put_device(parent); | |
5c8563d7 KS |
1095 | name_error: |
1096 | kfree(dev->p); | |
1097 | dev->p = NULL; | |
c906a48a | 1098 | goto done; |
1da177e4 LT |
1099 | } |
1100 | ||
1da177e4 | 1101 | /** |
4a3ad20c GKH |
1102 | * device_register - register a device with the system. |
1103 | * @dev: pointer to the device structure | |
1da177e4 | 1104 | * |
4a3ad20c GKH |
1105 | * This happens in two clean steps - initialize the device |
1106 | * and add it to the system. The two steps can be called | |
1107 | * separately, but this is the easiest and most common. | |
1108 | * I.e. you should only call the two helpers separately if | |
1109 | * have a clearly defined need to use and refcount the device | |
1110 | * before it is added to the hierarchy. | |
5739411a | 1111 | * |
b10d5efd AS |
1112 | * For more information, see the kerneldoc for device_initialize() |
1113 | * and device_add(). | |
1114 | * | |
5739411a CH |
1115 | * NOTE: _Never_ directly free @dev after calling this function, even |
1116 | * if it returned an error! Always use put_device() to give up the | |
1117 | * reference initialized in this function instead. | |
1da177e4 | 1118 | */ |
1da177e4 LT |
1119 | int device_register(struct device *dev) |
1120 | { | |
1121 | device_initialize(dev); | |
1122 | return device_add(dev); | |
1123 | } | |
1124 | ||
1da177e4 | 1125 | /** |
4a3ad20c GKH |
1126 | * get_device - increment reference count for device. |
1127 | * @dev: device. | |
1da177e4 | 1128 | * |
4a3ad20c GKH |
1129 | * This simply forwards the call to kobject_get(), though |
1130 | * we do take care to provide for the case that we get a NULL | |
1131 | * pointer passed in. | |
1da177e4 | 1132 | */ |
4a3ad20c | 1133 | struct device *get_device(struct device *dev) |
1da177e4 LT |
1134 | { |
1135 | return dev ? to_dev(kobject_get(&dev->kobj)) : NULL; | |
1136 | } | |
1137 | ||
1da177e4 | 1138 | /** |
4a3ad20c GKH |
1139 | * put_device - decrement reference count. |
1140 | * @dev: device in question. | |
1da177e4 | 1141 | */ |
4a3ad20c | 1142 | void put_device(struct device *dev) |
1da177e4 | 1143 | { |
edfaa7c3 | 1144 | /* might_sleep(); */ |
1da177e4 LT |
1145 | if (dev) |
1146 | kobject_put(&dev->kobj); | |
1147 | } | |
1148 | ||
1da177e4 | 1149 | /** |
4a3ad20c GKH |
1150 | * device_del - delete device from system. |
1151 | * @dev: device. | |
1da177e4 | 1152 | * |
4a3ad20c GKH |
1153 | * This is the first part of the device unregistration |
1154 | * sequence. This removes the device from the lists we control | |
1155 | * from here, has it removed from the other driver model | |
1156 | * subsystems it was added to in device_add(), and removes it | |
1157 | * from the kobject hierarchy. | |
1da177e4 | 1158 | * |
4a3ad20c GKH |
1159 | * NOTE: this should be called manually _iff_ device_add() was |
1160 | * also called manually. | |
1da177e4 | 1161 | */ |
4a3ad20c | 1162 | void device_del(struct device *dev) |
1da177e4 | 1163 | { |
4a3ad20c | 1164 | struct device *parent = dev->parent; |
c47ed219 | 1165 | struct class_interface *class_intf; |
1da177e4 | 1166 | |
ec0676ee AS |
1167 | /* Notify clients of device removal. This call must come |
1168 | * before dpm_sysfs_remove(). | |
1169 | */ | |
1170 | if (dev->bus) | |
1171 | blocking_notifier_call_chain(&dev->bus->p->bus_notifier, | |
1172 | BUS_NOTIFY_DEL_DEVICE, dev); | |
775b64d2 | 1173 | device_pm_remove(dev); |
3b98aeaf | 1174 | dpm_sysfs_remove(dev); |
1da177e4 | 1175 | if (parent) |
f791b8c8 | 1176 | klist_del(&dev->p->knode_parent); |
e105b8bf | 1177 | if (MAJOR(dev->devt)) { |
2b2af54a | 1178 | devtmpfs_delete_node(dev); |
e105b8bf | 1179 | device_remove_sys_dev_entry(dev); |
ad6a1e1c | 1180 | device_remove_file(dev, &devt_attr); |
e105b8bf | 1181 | } |
b9d9c82b | 1182 | if (dev->class) { |
da231fd5 | 1183 | device_remove_class_symlinks(dev); |
99ef3ef8 | 1184 | |
ca22e56d | 1185 | mutex_lock(&dev->class->p->mutex); |
c47ed219 | 1186 | /* notify any interfaces that the device is now gone */ |
184f1f77 | 1187 | list_for_each_entry(class_intf, |
ca22e56d | 1188 | &dev->class->p->interfaces, node) |
c47ed219 GKH |
1189 | if (class_intf->remove_dev) |
1190 | class_intf->remove_dev(dev, class_intf); | |
1191 | /* remove the device from the class list */ | |
5a3ceb86 | 1192 | klist_del(&dev->knode_class); |
ca22e56d | 1193 | mutex_unlock(&dev->class->p->mutex); |
b9d9c82b | 1194 | } |
ad6a1e1c | 1195 | device_remove_file(dev, &uevent_attr); |
2620efef | 1196 | device_remove_attrs(dev); |
28953533 | 1197 | bus_remove_device(dev); |
d1c3414c | 1198 | driver_deferred_probe_del(dev); |
1da177e4 | 1199 | |
2f8d16a9 TH |
1200 | /* |
1201 | * Some platform devices are driven without driver attached | |
1202 | * and managed resources may have been acquired. Make sure | |
1203 | * all resources are released. | |
1204 | */ | |
1205 | devres_release_all(dev); | |
1206 | ||
1da177e4 LT |
1207 | /* Notify the platform of the removal, in case they |
1208 | * need to do anything... | |
1209 | */ | |
1210 | if (platform_notify_remove) | |
1211 | platform_notify_remove(dev); | |
312c004d | 1212 | kobject_uevent(&dev->kobj, KOBJ_REMOVE); |
da231fd5 | 1213 | cleanup_device_parent(dev); |
1da177e4 | 1214 | kobject_del(&dev->kobj); |
da231fd5 | 1215 | put_device(parent); |
1da177e4 LT |
1216 | } |
1217 | ||
1218 | /** | |
4a3ad20c GKH |
1219 | * device_unregister - unregister device from system. |
1220 | * @dev: device going away. | |
1da177e4 | 1221 | * |
4a3ad20c GKH |
1222 | * We do this in two parts, like we do device_register(). First, |
1223 | * we remove it from all the subsystems with device_del(), then | |
1224 | * we decrement the reference count via put_device(). If that | |
1225 | * is the final reference count, the device will be cleaned up | |
1226 | * via device_release() above. Otherwise, the structure will | |
1227 | * stick around until the final reference to the device is dropped. | |
1da177e4 | 1228 | */ |
4a3ad20c | 1229 | void device_unregister(struct device *dev) |
1da177e4 | 1230 | { |
1e0b2cf9 | 1231 | pr_debug("device: '%s': %s\n", dev_name(dev), __func__); |
1da177e4 LT |
1232 | device_del(dev); |
1233 | put_device(dev); | |
1234 | } | |
1235 | ||
4a3ad20c | 1236 | static struct device *next_device(struct klist_iter *i) |
36239577 | 1237 | { |
4a3ad20c | 1238 | struct klist_node *n = klist_next(i); |
f791b8c8 GKH |
1239 | struct device *dev = NULL; |
1240 | struct device_private *p; | |
1241 | ||
1242 | if (n) { | |
1243 | p = to_device_private_parent(n); | |
1244 | dev = p->device; | |
1245 | } | |
1246 | return dev; | |
36239577 | 1247 | } |
1248 | ||
6fcf53ac | 1249 | /** |
e454cea2 | 1250 | * device_get_devnode - path of device node file |
6fcf53ac | 1251 | * @dev: device |
e454cea2 | 1252 | * @mode: returned file access mode |
6fcf53ac KS |
1253 | * @tmp: possibly allocated string |
1254 | * | |
1255 | * Return the relative path of a possible device node. | |
1256 | * Non-default names may need to allocate a memory to compose | |
1257 | * a name. This memory is returned in tmp and needs to be | |
1258 | * freed by the caller. | |
1259 | */ | |
e454cea2 | 1260 | const char *device_get_devnode(struct device *dev, |
2c9ede55 | 1261 | umode_t *mode, const char **tmp) |
6fcf53ac KS |
1262 | { |
1263 | char *s; | |
1264 | ||
1265 | *tmp = NULL; | |
1266 | ||
1267 | /* the device type may provide a specific name */ | |
e454cea2 KS |
1268 | if (dev->type && dev->type->devnode) |
1269 | *tmp = dev->type->devnode(dev, mode); | |
6fcf53ac KS |
1270 | if (*tmp) |
1271 | return *tmp; | |
1272 | ||
1273 | /* the class may provide a specific name */ | |
e454cea2 KS |
1274 | if (dev->class && dev->class->devnode) |
1275 | *tmp = dev->class->devnode(dev, mode); | |
6fcf53ac KS |
1276 | if (*tmp) |
1277 | return *tmp; | |
1278 | ||
1279 | /* return name without allocation, tmp == NULL */ | |
1280 | if (strchr(dev_name(dev), '!') == NULL) | |
1281 | return dev_name(dev); | |
1282 | ||
1283 | /* replace '!' in the name with '/' */ | |
1284 | *tmp = kstrdup(dev_name(dev), GFP_KERNEL); | |
1285 | if (!*tmp) | |
1286 | return NULL; | |
1287 | while ((s = strchr(*tmp, '!'))) | |
1288 | s[0] = '/'; | |
1289 | return *tmp; | |
1290 | } | |
1291 | ||
1da177e4 | 1292 | /** |
4a3ad20c GKH |
1293 | * device_for_each_child - device child iterator. |
1294 | * @parent: parent struct device. | |
1295 | * @data: data for the callback. | |
1296 | * @fn: function to be called for each device. | |
1da177e4 | 1297 | * |
4a3ad20c GKH |
1298 | * Iterate over @parent's child devices, and call @fn for each, |
1299 | * passing it @data. | |
1da177e4 | 1300 | * |
4a3ad20c GKH |
1301 | * We check the return of @fn each time. If it returns anything |
1302 | * other than 0, we break out and return that value. | |
1da177e4 | 1303 | */ |
4a3ad20c GKH |
1304 | int device_for_each_child(struct device *parent, void *data, |
1305 | int (*fn)(struct device *dev, void *data)) | |
1da177e4 | 1306 | { |
36239577 | 1307 | struct klist_iter i; |
4a3ad20c | 1308 | struct device *child; |
1da177e4 LT |
1309 | int error = 0; |
1310 | ||
014c90db GKH |
1311 | if (!parent->p) |
1312 | return 0; | |
1313 | ||
f791b8c8 | 1314 | klist_iter_init(&parent->p->klist_children, &i); |
36239577 | 1315 | while ((child = next_device(&i)) && !error) |
1316 | error = fn(child, data); | |
1317 | klist_iter_exit(&i); | |
1da177e4 LT |
1318 | return error; |
1319 | } | |
1320 | ||
5ab69981 CH |
1321 | /** |
1322 | * device_find_child - device iterator for locating a particular device. | |
1323 | * @parent: parent struct device | |
1324 | * @data: Data to pass to match function | |
1325 | * @match: Callback function to check device | |
1326 | * | |
1327 | * This is similar to the device_for_each_child() function above, but it | |
1328 | * returns a reference to a device that is 'found' for later use, as | |
1329 | * determined by the @match callback. | |
1330 | * | |
1331 | * The callback should return 0 if the device doesn't match and non-zero | |
1332 | * if it does. If the callback returns non-zero and a reference to the | |
1333 | * current device can be obtained, this function will return to the caller | |
1334 | * and not iterate over any more devices. | |
1335 | */ | |
4a3ad20c GKH |
1336 | struct device *device_find_child(struct device *parent, void *data, |
1337 | int (*match)(struct device *dev, void *data)) | |
5ab69981 CH |
1338 | { |
1339 | struct klist_iter i; | |
1340 | struct device *child; | |
1341 | ||
1342 | if (!parent) | |
1343 | return NULL; | |
1344 | ||
f791b8c8 | 1345 | klist_iter_init(&parent->p->klist_children, &i); |
5ab69981 CH |
1346 | while ((child = next_device(&i))) |
1347 | if (match(child, data) && get_device(child)) | |
1348 | break; | |
1349 | klist_iter_exit(&i); | |
1350 | return child; | |
1351 | } | |
1352 | ||
1da177e4 LT |
1353 | int __init devices_init(void) |
1354 | { | |
881c6cfd GKH |
1355 | devices_kset = kset_create_and_add("devices", &device_uevent_ops, NULL); |
1356 | if (!devices_kset) | |
1357 | return -ENOMEM; | |
e105b8bf DW |
1358 | dev_kobj = kobject_create_and_add("dev", NULL); |
1359 | if (!dev_kobj) | |
1360 | goto dev_kobj_err; | |
1361 | sysfs_dev_block_kobj = kobject_create_and_add("block", dev_kobj); | |
1362 | if (!sysfs_dev_block_kobj) | |
1363 | goto block_kobj_err; | |
1364 | sysfs_dev_char_kobj = kobject_create_and_add("char", dev_kobj); | |
1365 | if (!sysfs_dev_char_kobj) | |
1366 | goto char_kobj_err; | |
1367 | ||
881c6cfd | 1368 | return 0; |
e105b8bf DW |
1369 | |
1370 | char_kobj_err: | |
1371 | kobject_put(sysfs_dev_block_kobj); | |
1372 | block_kobj_err: | |
1373 | kobject_put(dev_kobj); | |
1374 | dev_kobj_err: | |
1375 | kset_unregister(devices_kset); | |
1376 | return -ENOMEM; | |
1da177e4 LT |
1377 | } |
1378 | ||
1379 | EXPORT_SYMBOL_GPL(device_for_each_child); | |
5ab69981 | 1380 | EXPORT_SYMBOL_GPL(device_find_child); |
1da177e4 LT |
1381 | |
1382 | EXPORT_SYMBOL_GPL(device_initialize); | |
1383 | EXPORT_SYMBOL_GPL(device_add); | |
1384 | EXPORT_SYMBOL_GPL(device_register); | |
1385 | ||
1386 | EXPORT_SYMBOL_GPL(device_del); | |
1387 | EXPORT_SYMBOL_GPL(device_unregister); | |
1388 | EXPORT_SYMBOL_GPL(get_device); | |
1389 | EXPORT_SYMBOL_GPL(put_device); | |
1da177e4 LT |
1390 | |
1391 | EXPORT_SYMBOL_GPL(device_create_file); | |
1392 | EXPORT_SYMBOL_GPL(device_remove_file); | |
23681e47 | 1393 | |
7f100d15 | 1394 | struct root_device { |
0aa0dc41 MM |
1395 | struct device dev; |
1396 | struct module *owner; | |
1397 | }; | |
1398 | ||
481e2079 FW |
1399 | inline struct root_device *to_root_device(struct device *d) |
1400 | { | |
1401 | return container_of(d, struct root_device, dev); | |
1402 | } | |
0aa0dc41 MM |
1403 | |
1404 | static void root_device_release(struct device *dev) | |
1405 | { | |
1406 | kfree(to_root_device(dev)); | |
1407 | } | |
1408 | ||
1409 | /** | |
1410 | * __root_device_register - allocate and register a root device | |
1411 | * @name: root device name | |
1412 | * @owner: owner module of the root device, usually THIS_MODULE | |
1413 | * | |
1414 | * This function allocates a root device and registers it | |
1415 | * using device_register(). In order to free the returned | |
1416 | * device, use root_device_unregister(). | |
1417 | * | |
1418 | * Root devices are dummy devices which allow other devices | |
1419 | * to be grouped under /sys/devices. Use this function to | |
1420 | * allocate a root device and then use it as the parent of | |
1421 | * any device which should appear under /sys/devices/{name} | |
1422 | * | |
1423 | * The /sys/devices/{name} directory will also contain a | |
1424 | * 'module' symlink which points to the @owner directory | |
1425 | * in sysfs. | |
1426 | * | |
f0eae0ed JN |
1427 | * Returns &struct device pointer on success, or ERR_PTR() on error. |
1428 | * | |
0aa0dc41 MM |
1429 | * Note: You probably want to use root_device_register(). |
1430 | */ | |
1431 | struct device *__root_device_register(const char *name, struct module *owner) | |
1432 | { | |
1433 | struct root_device *root; | |
1434 | int err = -ENOMEM; | |
1435 | ||
1436 | root = kzalloc(sizeof(struct root_device), GFP_KERNEL); | |
1437 | if (!root) | |
1438 | return ERR_PTR(err); | |
1439 | ||
acc0e90f | 1440 | err = dev_set_name(&root->dev, "%s", name); |
0aa0dc41 MM |
1441 | if (err) { |
1442 | kfree(root); | |
1443 | return ERR_PTR(err); | |
1444 | } | |
1445 | ||
1446 | root->dev.release = root_device_release; | |
1447 | ||
1448 | err = device_register(&root->dev); | |
1449 | if (err) { | |
1450 | put_device(&root->dev); | |
1451 | return ERR_PTR(err); | |
1452 | } | |
1453 | ||
1d9e882b | 1454 | #ifdef CONFIG_MODULES /* gotta find a "cleaner" way to do this */ |
0aa0dc41 MM |
1455 | if (owner) { |
1456 | struct module_kobject *mk = &owner->mkobj; | |
1457 | ||
1458 | err = sysfs_create_link(&root->dev.kobj, &mk->kobj, "module"); | |
1459 | if (err) { | |
1460 | device_unregister(&root->dev); | |
1461 | return ERR_PTR(err); | |
1462 | } | |
1463 | root->owner = owner; | |
1464 | } | |
1465 | #endif | |
1466 | ||
1467 | return &root->dev; | |
1468 | } | |
1469 | EXPORT_SYMBOL_GPL(__root_device_register); | |
1470 | ||
1471 | /** | |
1472 | * root_device_unregister - unregister and free a root device | |
7cbcf225 | 1473 | * @dev: device going away |
0aa0dc41 MM |
1474 | * |
1475 | * This function unregisters and cleans up a device that was created by | |
1476 | * root_device_register(). | |
1477 | */ | |
1478 | void root_device_unregister(struct device *dev) | |
1479 | { | |
1480 | struct root_device *root = to_root_device(dev); | |
1481 | ||
1482 | if (root->owner) | |
1483 | sysfs_remove_link(&root->dev.kobj, "module"); | |
1484 | ||
1485 | device_unregister(dev); | |
1486 | } | |
1487 | EXPORT_SYMBOL_GPL(root_device_unregister); | |
1488 | ||
23681e47 GKH |
1489 | |
1490 | static void device_create_release(struct device *dev) | |
1491 | { | |
1e0b2cf9 | 1492 | pr_debug("device: '%s': %s\n", dev_name(dev), __func__); |
23681e47 GKH |
1493 | kfree(dev); |
1494 | } | |
1495 | ||
1496 | /** | |
8882b394 | 1497 | * device_create_vargs - creates a device and registers it with sysfs |
42734daf HK |
1498 | * @class: pointer to the struct class that this device should be registered to |
1499 | * @parent: pointer to the parent struct device of this new device, if any | |
1500 | * @devt: the dev_t for the char device to be added | |
8882b394 | 1501 | * @drvdata: the data to be added to the device for callbacks |
42734daf | 1502 | * @fmt: string for the device's name |
8882b394 | 1503 | * @args: va_list for the device's name |
42734daf HK |
1504 | * |
1505 | * This function can be used by char device classes. A struct device | |
1506 | * will be created in sysfs, registered to the specified class. | |
23681e47 | 1507 | * |
23681e47 GKH |
1508 | * A "dev" file will be created, showing the dev_t for the device, if |
1509 | * the dev_t is not 0,0. | |
42734daf HK |
1510 | * If a pointer to a parent struct device is passed in, the newly created |
1511 | * struct device will be a child of that device in sysfs. | |
1512 | * The pointer to the struct device will be returned from the call. | |
1513 | * Any further sysfs files that might be required can be created using this | |
23681e47 GKH |
1514 | * pointer. |
1515 | * | |
f0eae0ed JN |
1516 | * Returns &struct device pointer on success, or ERR_PTR() on error. |
1517 | * | |
23681e47 GKH |
1518 | * Note: the struct class passed to this function must have previously |
1519 | * been created with a call to class_create(). | |
1520 | */ | |
8882b394 GKH |
1521 | struct device *device_create_vargs(struct class *class, struct device *parent, |
1522 | dev_t devt, void *drvdata, const char *fmt, | |
1523 | va_list args) | |
23681e47 | 1524 | { |
23681e47 GKH |
1525 | struct device *dev = NULL; |
1526 | int retval = -ENODEV; | |
1527 | ||
1528 | if (class == NULL || IS_ERR(class)) | |
1529 | goto error; | |
23681e47 GKH |
1530 | |
1531 | dev = kzalloc(sizeof(*dev), GFP_KERNEL); | |
1532 | if (!dev) { | |
1533 | retval = -ENOMEM; | |
1534 | goto error; | |
1535 | } | |
1536 | ||
1537 | dev->devt = devt; | |
1538 | dev->class = class; | |
1539 | dev->parent = parent; | |
1540 | dev->release = device_create_release; | |
8882b394 | 1541 | dev_set_drvdata(dev, drvdata); |
23681e47 | 1542 | |
1fa5ae85 KS |
1543 | retval = kobject_set_name_vargs(&dev->kobj, fmt, args); |
1544 | if (retval) | |
1545 | goto error; | |
1546 | ||
23681e47 GKH |
1547 | retval = device_register(dev); |
1548 | if (retval) | |
1549 | goto error; | |
1550 | ||
23681e47 GKH |
1551 | return dev; |
1552 | ||
1553 | error: | |
286661b3 | 1554 | put_device(dev); |
23681e47 GKH |
1555 | return ERR_PTR(retval); |
1556 | } | |
8882b394 GKH |
1557 | EXPORT_SYMBOL_GPL(device_create_vargs); |
1558 | ||
1559 | /** | |
4e106739 | 1560 | * device_create - creates a device and registers it with sysfs |
8882b394 GKH |
1561 | * @class: pointer to the struct class that this device should be registered to |
1562 | * @parent: pointer to the parent struct device of this new device, if any | |
1563 | * @devt: the dev_t for the char device to be added | |
1564 | * @drvdata: the data to be added to the device for callbacks | |
1565 | * @fmt: string for the device's name | |
1566 | * | |
1567 | * This function can be used by char device classes. A struct device | |
1568 | * will be created in sysfs, registered to the specified class. | |
1569 | * | |
1570 | * A "dev" file will be created, showing the dev_t for the device, if | |
1571 | * the dev_t is not 0,0. | |
1572 | * If a pointer to a parent struct device is passed in, the newly created | |
1573 | * struct device will be a child of that device in sysfs. | |
1574 | * The pointer to the struct device will be returned from the call. | |
1575 | * Any further sysfs files that might be required can be created using this | |
1576 | * pointer. | |
1577 | * | |
f0eae0ed JN |
1578 | * Returns &struct device pointer on success, or ERR_PTR() on error. |
1579 | * | |
8882b394 GKH |
1580 | * Note: the struct class passed to this function must have previously |
1581 | * been created with a call to class_create(). | |
1582 | */ | |
4e106739 GKH |
1583 | struct device *device_create(struct class *class, struct device *parent, |
1584 | dev_t devt, void *drvdata, const char *fmt, ...) | |
8882b394 GKH |
1585 | { |
1586 | va_list vargs; | |
1587 | struct device *dev; | |
1588 | ||
1589 | va_start(vargs, fmt); | |
1590 | dev = device_create_vargs(class, parent, devt, drvdata, fmt, vargs); | |
1591 | va_end(vargs); | |
1592 | return dev; | |
1593 | } | |
4e106739 | 1594 | EXPORT_SYMBOL_GPL(device_create); |
8882b394 | 1595 | |
cd35449b | 1596 | static int __match_devt(struct device *dev, void *data) |
23681e47 | 1597 | { |
cd35449b | 1598 | dev_t *devt = data; |
23681e47 | 1599 | |
cd35449b | 1600 | return dev->devt == *devt; |
775b64d2 RW |
1601 | } |
1602 | ||
1603 | /** | |
1604 | * device_destroy - removes a device that was created with device_create() | |
1605 | * @class: pointer to the struct class that this device was registered with | |
1606 | * @devt: the dev_t of the device that was previously registered | |
1607 | * | |
1608 | * This call unregisters and cleans up a device that was created with a | |
1609 | * call to device_create(). | |
1610 | */ | |
1611 | void device_destroy(struct class *class, dev_t devt) | |
1612 | { | |
1613 | struct device *dev; | |
23681e47 | 1614 | |
695794ae | 1615 | dev = class_find_device(class, NULL, &devt, __match_devt); |
cd35449b DY |
1616 | if (dev) { |
1617 | put_device(dev); | |
23681e47 | 1618 | device_unregister(dev); |
cd35449b | 1619 | } |
23681e47 GKH |
1620 | } |
1621 | EXPORT_SYMBOL_GPL(device_destroy); | |
a2de48ca GKH |
1622 | |
1623 | /** | |
1624 | * device_rename - renames a device | |
1625 | * @dev: the pointer to the struct device to be renamed | |
1626 | * @new_name: the new name of the device | |
030c1d2b EB |
1627 | * |
1628 | * It is the responsibility of the caller to provide mutual | |
1629 | * exclusion between two different calls of device_rename | |
1630 | * on the same device to ensure that new_name is valid and | |
1631 | * won't conflict with other devices. | |
c6c0ac66 | 1632 | * |
a5462516 TT |
1633 | * Note: Don't call this function. Currently, the networking layer calls this |
1634 | * function, but that will change. The following text from Kay Sievers offers | |
1635 | * some insight: | |
1636 | * | |
1637 | * Renaming devices is racy at many levels, symlinks and other stuff are not | |
1638 | * replaced atomically, and you get a "move" uevent, but it's not easy to | |
1639 | * connect the event to the old and new device. Device nodes are not renamed at | |
1640 | * all, there isn't even support for that in the kernel now. | |
1641 | * | |
1642 | * In the meantime, during renaming, your target name might be taken by another | |
1643 | * driver, creating conflicts. Or the old name is taken directly after you | |
1644 | * renamed it -- then you get events for the same DEVPATH, before you even see | |
1645 | * the "move" event. It's just a mess, and nothing new should ever rely on | |
1646 | * kernel device renaming. Besides that, it's not even implemented now for | |
1647 | * other things than (driver-core wise very simple) network devices. | |
1648 | * | |
1649 | * We are currently about to change network renaming in udev to completely | |
1650 | * disallow renaming of devices in the same namespace as the kernel uses, | |
1651 | * because we can't solve the problems properly, that arise with swapping names | |
1652 | * of multiple interfaces without races. Means, renaming of eth[0-9]* will only | |
1653 | * be allowed to some other name than eth[0-9]*, for the aforementioned | |
1654 | * reasons. | |
1655 | * | |
1656 | * Make up a "real" name in the driver before you register anything, or add | |
1657 | * some other attributes for userspace to find the device, or use udev to add | |
1658 | * symlinks -- but never rename kernel devices later, it's a complete mess. We | |
1659 | * don't even want to get into that and try to implement the missing pieces in | |
1660 | * the core. We really have other pieces to fix in the driver core mess. :) | |
a2de48ca | 1661 | */ |
6937e8f8 | 1662 | int device_rename(struct device *dev, const char *new_name) |
a2de48ca GKH |
1663 | { |
1664 | char *old_class_name = NULL; | |
1665 | char *new_class_name = NULL; | |
2ee97caf | 1666 | char *old_device_name = NULL; |
a2de48ca GKH |
1667 | int error; |
1668 | ||
1669 | dev = get_device(dev); | |
1670 | if (!dev) | |
1671 | return -EINVAL; | |
1672 | ||
1e0b2cf9 | 1673 | pr_debug("device: '%s': %s: renaming to '%s'\n", dev_name(dev), |
2b3a302a | 1674 | __func__, new_name); |
a2de48ca | 1675 | |
1fa5ae85 | 1676 | old_device_name = kstrdup(dev_name(dev), GFP_KERNEL); |
2ee97caf CH |
1677 | if (!old_device_name) { |
1678 | error = -ENOMEM; | |
1679 | goto out; | |
a2de48ca | 1680 | } |
a2de48ca | 1681 | |
f349cf34 | 1682 | if (dev->class) { |
6b6e39a6 | 1683 | error = sysfs_rename_link(&dev->class->p->subsys.kobj, |
f349cf34 EB |
1684 | &dev->kobj, old_device_name, new_name); |
1685 | if (error) | |
1686 | goto out; | |
1687 | } | |
39aba963 | 1688 | |
a2de48ca | 1689 | error = kobject_rename(&dev->kobj, new_name); |
1fa5ae85 | 1690 | if (error) |
2ee97caf | 1691 | goto out; |
a2de48ca | 1692 | |
2ee97caf | 1693 | out: |
a2de48ca GKH |
1694 | put_device(dev); |
1695 | ||
a2de48ca | 1696 | kfree(new_class_name); |
952ab431 | 1697 | kfree(old_class_name); |
2ee97caf | 1698 | kfree(old_device_name); |
a2de48ca GKH |
1699 | |
1700 | return error; | |
1701 | } | |
a2807dbc | 1702 | EXPORT_SYMBOL_GPL(device_rename); |
8a82472f CH |
1703 | |
1704 | static int device_move_class_links(struct device *dev, | |
1705 | struct device *old_parent, | |
1706 | struct device *new_parent) | |
1707 | { | |
f7f3461d | 1708 | int error = 0; |
8a82472f | 1709 | |
f7f3461d GKH |
1710 | if (old_parent) |
1711 | sysfs_remove_link(&dev->kobj, "device"); | |
1712 | if (new_parent) | |
1713 | error = sysfs_create_link(&dev->kobj, &new_parent->kobj, | |
1714 | "device"); | |
1715 | return error; | |
8a82472f CH |
1716 | } |
1717 | ||
1718 | /** | |
1719 | * device_move - moves a device to a new parent | |
1720 | * @dev: the pointer to the struct device to be moved | |
c744aeae | 1721 | * @new_parent: the new parent of the device (can by NULL) |
ffa6a705 | 1722 | * @dpm_order: how to reorder the dpm_list |
8a82472f | 1723 | */ |
ffa6a705 CH |
1724 | int device_move(struct device *dev, struct device *new_parent, |
1725 | enum dpm_order dpm_order) | |
8a82472f CH |
1726 | { |
1727 | int error; | |
1728 | struct device *old_parent; | |
c744aeae | 1729 | struct kobject *new_parent_kobj; |
8a82472f CH |
1730 | |
1731 | dev = get_device(dev); | |
1732 | if (!dev) | |
1733 | return -EINVAL; | |
1734 | ||
ffa6a705 | 1735 | device_pm_lock(); |
8a82472f | 1736 | new_parent = get_device(new_parent); |
4a3ad20c | 1737 | new_parent_kobj = get_device_parent(dev, new_parent); |
63b6971a | 1738 | |
1e0b2cf9 KS |
1739 | pr_debug("device: '%s': %s: moving to '%s'\n", dev_name(dev), |
1740 | __func__, new_parent ? dev_name(new_parent) : "<NULL>"); | |
c744aeae | 1741 | error = kobject_move(&dev->kobj, new_parent_kobj); |
8a82472f | 1742 | if (error) { |
63b6971a | 1743 | cleanup_glue_dir(dev, new_parent_kobj); |
8a82472f CH |
1744 | put_device(new_parent); |
1745 | goto out; | |
1746 | } | |
1747 | old_parent = dev->parent; | |
1748 | dev->parent = new_parent; | |
1749 | if (old_parent) | |
f791b8c8 | 1750 | klist_remove(&dev->p->knode_parent); |
0d358f22 | 1751 | if (new_parent) { |
f791b8c8 GKH |
1752 | klist_add_tail(&dev->p->knode_parent, |
1753 | &new_parent->p->klist_children); | |
0d358f22 YL |
1754 | set_dev_node(dev, dev_to_node(new_parent)); |
1755 | } | |
1756 | ||
bdd4034d RV |
1757 | if (dev->class) { |
1758 | error = device_move_class_links(dev, old_parent, new_parent); | |
1759 | if (error) { | |
1760 | /* We ignore errors on cleanup since we're hosed anyway... */ | |
1761 | device_move_class_links(dev, new_parent, old_parent); | |
1762 | if (!kobject_move(&dev->kobj, &old_parent->kobj)) { | |
1763 | if (new_parent) | |
1764 | klist_remove(&dev->p->knode_parent); | |
1765 | dev->parent = old_parent; | |
1766 | if (old_parent) { | |
1767 | klist_add_tail(&dev->p->knode_parent, | |
1768 | &old_parent->p->klist_children); | |
1769 | set_dev_node(dev, dev_to_node(old_parent)); | |
1770 | } | |
0d358f22 | 1771 | } |
bdd4034d RV |
1772 | cleanup_glue_dir(dev, new_parent_kobj); |
1773 | put_device(new_parent); | |
1774 | goto out; | |
8a82472f | 1775 | } |
8a82472f | 1776 | } |
ffa6a705 CH |
1777 | switch (dpm_order) { |
1778 | case DPM_ORDER_NONE: | |
1779 | break; | |
1780 | case DPM_ORDER_DEV_AFTER_PARENT: | |
1781 | device_pm_move_after(dev, new_parent); | |
1782 | break; | |
1783 | case DPM_ORDER_PARENT_BEFORE_DEV: | |
1784 | device_pm_move_before(new_parent, dev); | |
1785 | break; | |
1786 | case DPM_ORDER_DEV_LAST: | |
1787 | device_pm_move_last(dev); | |
1788 | break; | |
1789 | } | |
bdd4034d | 1790 | |
8a82472f CH |
1791 | put_device(old_parent); |
1792 | out: | |
ffa6a705 | 1793 | device_pm_unlock(); |
8a82472f CH |
1794 | put_device(dev); |
1795 | return error; | |
1796 | } | |
8a82472f | 1797 | EXPORT_SYMBOL_GPL(device_move); |
37b0c020 GKH |
1798 | |
1799 | /** | |
1800 | * device_shutdown - call ->shutdown() on each device to shutdown. | |
1801 | */ | |
1802 | void device_shutdown(void) | |
1803 | { | |
6245838f HD |
1804 | struct device *dev; |
1805 | ||
1806 | spin_lock(&devices_kset->list_lock); | |
1807 | /* | |
1808 | * Walk the devices list backward, shutting down each in turn. | |
1809 | * Beware that device unplug events may also start pulling | |
1810 | * devices offline, even as the system is shutting down. | |
1811 | */ | |
1812 | while (!list_empty(&devices_kset->list)) { | |
1813 | dev = list_entry(devices_kset->list.prev, struct device, | |
1814 | kobj.entry); | |
d1c6c030 ML |
1815 | |
1816 | /* | |
1817 | * hold reference count of device's parent to | |
1818 | * prevent it from being freed because parent's | |
1819 | * lock is to be held | |
1820 | */ | |
1821 | get_device(dev->parent); | |
6245838f HD |
1822 | get_device(dev); |
1823 | /* | |
1824 | * Make sure the device is off the kset list, in the | |
1825 | * event that dev->*->shutdown() doesn't remove it. | |
1826 | */ | |
1827 | list_del_init(&dev->kobj.entry); | |
1828 | spin_unlock(&devices_kset->list_lock); | |
fe6b91f4 | 1829 | |
d1c6c030 ML |
1830 | /* hold lock to avoid race with probe/release */ |
1831 | if (dev->parent) | |
1832 | device_lock(dev->parent); | |
1833 | device_lock(dev); | |
1834 | ||
fe6b91f4 AS |
1835 | /* Don't allow any more runtime suspends */ |
1836 | pm_runtime_get_noresume(dev); | |
1837 | pm_runtime_barrier(dev); | |
37b0c020 | 1838 | |
37b0c020 GKH |
1839 | if (dev->bus && dev->bus->shutdown) { |
1840 | dev_dbg(dev, "shutdown\n"); | |
1841 | dev->bus->shutdown(dev); | |
1842 | } else if (dev->driver && dev->driver->shutdown) { | |
1843 | dev_dbg(dev, "shutdown\n"); | |
1844 | dev->driver->shutdown(dev); | |
1845 | } | |
d1c6c030 ML |
1846 | |
1847 | device_unlock(dev); | |
1848 | if (dev->parent) | |
1849 | device_unlock(dev->parent); | |
1850 | ||
6245838f | 1851 | put_device(dev); |
d1c6c030 | 1852 | put_device(dev->parent); |
6245838f HD |
1853 | |
1854 | spin_lock(&devices_kset->list_lock); | |
37b0c020 | 1855 | } |
6245838f | 1856 | spin_unlock(&devices_kset->list_lock); |
401097ea | 1857 | async_synchronize_full(); |
37b0c020 | 1858 | } |
99bcf217 JP |
1859 | |
1860 | /* | |
1861 | * Device logging functions | |
1862 | */ | |
1863 | ||
1864 | #ifdef CONFIG_PRINTK | |
cbc46635 JP |
1865 | int __dev_printk(const char *level, const struct device *dev, |
1866 | struct va_format *vaf) | |
99bcf217 | 1867 | { |
c4e00daa KS |
1868 | char dict[128]; |
1869 | size_t dictlen = 0; | |
1870 | const char *subsys; | |
1871 | ||
99bcf217 JP |
1872 | if (!dev) |
1873 | return printk("%s(NULL device *): %pV", level, vaf); | |
1874 | ||
c4e00daa KS |
1875 | if (dev->class) |
1876 | subsys = dev->class->name; | |
1877 | else if (dev->bus) | |
1878 | subsys = dev->bus->name; | |
1879 | else | |
1880 | goto skip; | |
1881 | ||
1882 | dictlen += snprintf(dict + dictlen, sizeof(dict) - dictlen, | |
1883 | "SUBSYSTEM=%s", subsys); | |
1884 | ||
1885 | /* | |
1886 | * Add device identifier DEVICE=: | |
1887 | * b12:8 block dev_t | |
1888 | * c127:3 char dev_t | |
1889 | * n8 netdev ifindex | |
1890 | * +sound:card0 subsystem:devname | |
1891 | */ | |
1892 | if (MAJOR(dev->devt)) { | |
1893 | char c; | |
1894 | ||
1895 | if (strcmp(subsys, "block") == 0) | |
1896 | c = 'b'; | |
1897 | else | |
1898 | c = 'c'; | |
1899 | dictlen++; | |
1900 | dictlen += snprintf(dict + dictlen, sizeof(dict) - dictlen, | |
1901 | "DEVICE=%c%u:%u", | |
1902 | c, MAJOR(dev->devt), MINOR(dev->devt)); | |
1903 | } else if (strcmp(subsys, "net") == 0) { | |
1904 | struct net_device *net = to_net_dev(dev); | |
1905 | ||
1906 | dictlen++; | |
1907 | dictlen += snprintf(dict + dictlen, sizeof(dict) - dictlen, | |
1908 | "DEVICE=n%u", net->ifindex); | |
1909 | } else { | |
1910 | dictlen++; | |
1911 | dictlen += snprintf(dict + dictlen, sizeof(dict) - dictlen, | |
1912 | "DEVICE=+%s:%s", subsys, dev_name(dev)); | |
1913 | } | |
1914 | skip: | |
1915 | return printk_emit(0, level[1] - '0', | |
1916 | dictlen ? dict : NULL, dictlen, | |
1917 | "%s %s: %pV", | |
1918 | dev_driver_string(dev), dev_name(dev), vaf); | |
99bcf217 | 1919 | } |
cbc46635 | 1920 | EXPORT_SYMBOL(__dev_printk); |
99bcf217 JP |
1921 | |
1922 | int dev_printk(const char *level, const struct device *dev, | |
1923 | const char *fmt, ...) | |
1924 | { | |
1925 | struct va_format vaf; | |
1926 | va_list args; | |
1927 | int r; | |
1928 | ||
1929 | va_start(args, fmt); | |
1930 | ||
1931 | vaf.fmt = fmt; | |
1932 | vaf.va = &args; | |
1933 | ||
1934 | r = __dev_printk(level, dev, &vaf); | |
1935 | va_end(args); | |
1936 | ||
1937 | return r; | |
1938 | } | |
1939 | EXPORT_SYMBOL(dev_printk); | |
1940 | ||
1941 | #define define_dev_printk_level(func, kern_level) \ | |
1942 | int func(const struct device *dev, const char *fmt, ...) \ | |
1943 | { \ | |
1944 | struct va_format vaf; \ | |
1945 | va_list args; \ | |
1946 | int r; \ | |
1947 | \ | |
1948 | va_start(args, fmt); \ | |
1949 | \ | |
1950 | vaf.fmt = fmt; \ | |
1951 | vaf.va = &args; \ | |
1952 | \ | |
1953 | r = __dev_printk(kern_level, dev, &vaf); \ | |
1954 | va_end(args); \ | |
1955 | \ | |
1956 | return r; \ | |
1957 | } \ | |
1958 | EXPORT_SYMBOL(func); | |
1959 | ||
1960 | define_dev_printk_level(dev_emerg, KERN_EMERG); | |
1961 | define_dev_printk_level(dev_alert, KERN_ALERT); | |
1962 | define_dev_printk_level(dev_crit, KERN_CRIT); | |
1963 | define_dev_printk_level(dev_err, KERN_ERR); | |
1964 | define_dev_printk_level(dev_warn, KERN_WARNING); | |
1965 | define_dev_printk_level(dev_notice, KERN_NOTICE); | |
1966 | define_dev_printk_level(_dev_info, KERN_INFO); | |
1967 | ||
1968 | #endif |