Commit | Line | Data |
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1da177e4 LT |
1 | /* |
2 | * sys.c - pseudo-bus for system 'devices' (cpus, PICs, timers, etc) | |
3 | * | |
4 | * Copyright (c) 2002-3 Patrick Mochel | |
5 | * 2002-3 Open Source Development Lab | |
6 | * | |
7 | * This file is released under the GPLv2 | |
8 | * | |
9 | * This exports a 'system' bus type. | |
10 | * By default, a 'sys' bus gets added to the root of the system. There will | |
11 | * always be core system devices. Devices can use sysdev_register() to | |
12 | * add themselves as children of the system bus. | |
13 | */ | |
14 | ||
1da177e4 LT |
15 | #include <linux/sysdev.h> |
16 | #include <linux/err.h> | |
17 | #include <linux/module.h> | |
18 | #include <linux/kernel.h> | |
19 | #include <linux/init.h> | |
20 | #include <linux/slab.h> | |
21 | #include <linux/string.h> | |
438510f6 | 22 | #include <linux/pm.h> |
f67d115f | 23 | #include <linux/device.h> |
9f3f776b | 24 | #include <linux/mutex.h> |
1da177e4 | 25 | |
f67d115f AB |
26 | #include "base.h" |
27 | ||
1da177e4 LT |
28 | #define to_sysdev(k) container_of(k, struct sys_device, kobj) |
29 | #define to_sysdev_attr(a) container_of(a, struct sysdev_attribute, attr) | |
30 | ||
31 | ||
32 | static ssize_t | |
60530afe | 33 | sysdev_show(struct kobject *kobj, struct attribute *attr, char *buffer) |
1da177e4 | 34 | { |
60530afe ZX |
35 | struct sys_device *sysdev = to_sysdev(kobj); |
36 | struct sysdev_attribute *sysdev_attr = to_sysdev_attr(attr); | |
1da177e4 LT |
37 | |
38 | if (sysdev_attr->show) | |
4a0b2b4d | 39 | return sysdev_attr->show(sysdev, sysdev_attr, buffer); |
4a0c20bf | 40 | return -EIO; |
1da177e4 LT |
41 | } |
42 | ||
43 | ||
44 | static ssize_t | |
60530afe ZX |
45 | sysdev_store(struct kobject *kobj, struct attribute *attr, |
46 | const char *buffer, size_t count) | |
1da177e4 | 47 | { |
60530afe ZX |
48 | struct sys_device *sysdev = to_sysdev(kobj); |
49 | struct sysdev_attribute *sysdev_attr = to_sysdev_attr(attr); | |
1da177e4 LT |
50 | |
51 | if (sysdev_attr->store) | |
4a0b2b4d | 52 | return sysdev_attr->store(sysdev, sysdev_attr, buffer, count); |
4a0c20bf | 53 | return -EIO; |
1da177e4 LT |
54 | } |
55 | ||
56 | static struct sysfs_ops sysfs_ops = { | |
57 | .show = sysdev_show, | |
58 | .store = sysdev_store, | |
59 | }; | |
60 | ||
61 | static struct kobj_type ktype_sysdev = { | |
62 | .sysfs_ops = &sysfs_ops, | |
63 | }; | |
64 | ||
65 | ||
60530afe | 66 | int sysdev_create_file(struct sys_device *s, struct sysdev_attribute *a) |
1da177e4 LT |
67 | { |
68 | return sysfs_create_file(&s->kobj, &a->attr); | |
69 | } | |
70 | ||
71 | ||
60530afe | 72 | void sysdev_remove_file(struct sys_device *s, struct sysdev_attribute *a) |
1da177e4 LT |
73 | { |
74 | sysfs_remove_file(&s->kobj, &a->attr); | |
75 | } | |
76 | ||
77 | EXPORT_SYMBOL_GPL(sysdev_create_file); | |
78 | EXPORT_SYMBOL_GPL(sysdev_remove_file); | |
79 | ||
670dd90d SL |
80 | #define to_sysdev_class(k) container_of(k, struct sysdev_class, kset.kobj) |
81 | #define to_sysdev_class_attr(a) container_of(a, \ | |
82 | struct sysdev_class_attribute, attr) | |
83 | ||
84 | static ssize_t sysdev_class_show(struct kobject *kobj, struct attribute *attr, | |
85 | char *buffer) | |
86 | { | |
60530afe | 87 | struct sysdev_class *class = to_sysdev_class(kobj); |
670dd90d SL |
88 | struct sysdev_class_attribute *class_attr = to_sysdev_class_attr(attr); |
89 | ||
90 | if (class_attr->show) | |
91 | return class_attr->show(class, buffer); | |
92 | return -EIO; | |
93 | } | |
94 | ||
95 | static ssize_t sysdev_class_store(struct kobject *kobj, struct attribute *attr, | |
96 | const char *buffer, size_t count) | |
97 | { | |
60530afe ZX |
98 | struct sysdev_class *class = to_sysdev_class(kobj); |
99 | struct sysdev_class_attribute *class_attr = to_sysdev_class_attr(attr); | |
670dd90d SL |
100 | |
101 | if (class_attr->store) | |
102 | return class_attr->store(class, buffer, count); | |
103 | return -EIO; | |
104 | } | |
105 | ||
106 | static struct sysfs_ops sysfs_class_ops = { | |
107 | .show = sysdev_class_show, | |
108 | .store = sysdev_class_store, | |
109 | }; | |
110 | ||
111 | static struct kobj_type ktype_sysdev_class = { | |
112 | .sysfs_ops = &sysfs_class_ops, | |
113 | }; | |
114 | ||
115 | int sysdev_class_create_file(struct sysdev_class *c, | |
116 | struct sysdev_class_attribute *a) | |
117 | { | |
118 | return sysfs_create_file(&c->kset.kobj, &a->attr); | |
119 | } | |
120 | EXPORT_SYMBOL_GPL(sysdev_class_create_file); | |
121 | ||
122 | void sysdev_class_remove_file(struct sysdev_class *c, | |
123 | struct sysdev_class_attribute *a) | |
124 | { | |
125 | sysfs_remove_file(&c->kset.kobj, &a->attr); | |
126 | } | |
127 | EXPORT_SYMBOL_GPL(sysdev_class_remove_file); | |
128 | ||
aade4041 | 129 | static struct kset *system_kset; |
1da177e4 | 130 | |
60530afe | 131 | int sysdev_class_register(struct sysdev_class *cls) |
1da177e4 | 132 | { |
838ea8e8 BD |
133 | pr_debug("Registering sysdev class '%s'\n", cls->name); |
134 | ||
1da177e4 | 135 | INIT_LIST_HEAD(&cls->drivers); |
ef79df26 | 136 | memset(&cls->kset.kobj, 0x00, sizeof(struct kobject)); |
aade4041 | 137 | cls->kset.kobj.parent = &system_kset->kobj; |
3514faca | 138 | cls->kset.kobj.ktype = &ktype_sysdev_class; |
aade4041 | 139 | cls->kset.kobj.kset = system_kset; |
af5ca3f4 | 140 | kobject_set_name(&cls->kset.kobj, cls->name); |
1da177e4 LT |
141 | return kset_register(&cls->kset); |
142 | } | |
143 | ||
60530afe | 144 | void sysdev_class_unregister(struct sysdev_class *cls) |
1da177e4 LT |
145 | { |
146 | pr_debug("Unregistering sysdev class '%s'\n", | |
147 | kobject_name(&cls->kset.kobj)); | |
148 | kset_unregister(&cls->kset); | |
149 | } | |
150 | ||
151 | EXPORT_SYMBOL_GPL(sysdev_class_register); | |
152 | EXPORT_SYMBOL_GPL(sysdev_class_unregister); | |
153 | ||
9f3f776b | 154 | static DEFINE_MUTEX(sysdev_drivers_lock); |
1da177e4 LT |
155 | |
156 | /** | |
157 | * sysdev_driver_register - Register auxillary driver | |
44b760a8 | 158 | * @cls: Device class driver belongs to. |
1da177e4 LT |
159 | * @drv: Driver. |
160 | * | |
44b760a8 | 161 | * @drv is inserted into @cls->drivers to be |
1da177e4 LT |
162 | * called on each operation on devices of that class. The refcount |
163 | * of @cls is incremented. | |
1da177e4 LT |
164 | */ |
165 | ||
44b760a8 | 166 | int sysdev_driver_register(struct sysdev_class *cls, struct sysdev_driver *drv) |
1da177e4 | 167 | { |
44b760a8 AM |
168 | int err = 0; |
169 | ||
da009f39 | 170 | if (!cls) { |
f810a5cf | 171 | WARN(1, KERN_WARNING "sysdev: invalid class passed to " |
da009f39 | 172 | "sysdev_driver_register!\n"); |
da009f39 BD |
173 | return -EINVAL; |
174 | } | |
175 | ||
176 | /* Check whether this driver has already been added to a class. */ | |
f810a5cf AV |
177 | if (drv->entry.next && !list_empty(&drv->entry)) |
178 | WARN(1, KERN_WARNING "sysdev: class %s: driver (%p) has already" | |
da009f39 BD |
179 | " been registered to a class, something is wrong, but " |
180 | "will forge on!\n", cls->name, drv); | |
da009f39 | 181 | |
9f3f776b | 182 | mutex_lock(&sysdev_drivers_lock); |
1da177e4 LT |
183 | if (cls && kset_get(&cls->kset)) { |
184 | list_add_tail(&drv->entry, &cls->drivers); | |
185 | ||
186 | /* If devices of this class already exist, tell the driver */ | |
187 | if (drv->add) { | |
188 | struct sys_device *dev; | |
189 | list_for_each_entry(dev, &cls->kset.list, kobj.entry) | |
190 | drv->add(dev); | |
191 | } | |
44b760a8 AM |
192 | } else { |
193 | err = -EINVAL; | |
f810a5cf | 194 | WARN(1, KERN_ERR "%s: invalid device class\n", __func__); |
44b760a8 | 195 | } |
9f3f776b | 196 | mutex_unlock(&sysdev_drivers_lock); |
44b760a8 | 197 | return err; |
1da177e4 LT |
198 | } |
199 | ||
200 | ||
201 | /** | |
202 | * sysdev_driver_unregister - Remove an auxillary driver. | |
203 | * @cls: Class driver belongs to. | |
204 | * @drv: Driver. | |
205 | */ | |
60530afe ZX |
206 | void sysdev_driver_unregister(struct sysdev_class *cls, |
207 | struct sysdev_driver *drv) | |
1da177e4 | 208 | { |
9f3f776b | 209 | mutex_lock(&sysdev_drivers_lock); |
1da177e4 LT |
210 | list_del_init(&drv->entry); |
211 | if (cls) { | |
212 | if (drv->remove) { | |
213 | struct sys_device *dev; | |
214 | list_for_each_entry(dev, &cls->kset.list, kobj.entry) | |
215 | drv->remove(dev); | |
216 | } | |
217 | kset_put(&cls->kset); | |
218 | } | |
9f3f776b | 219 | mutex_unlock(&sysdev_drivers_lock); |
1da177e4 LT |
220 | } |
221 | ||
222 | EXPORT_SYMBOL_GPL(sysdev_driver_register); | |
223 | EXPORT_SYMBOL_GPL(sysdev_driver_unregister); | |
224 | ||
225 | ||
226 | ||
227 | /** | |
228 | * sysdev_register - add a system device to the tree | |
229 | * @sysdev: device in question | |
230 | * | |
231 | */ | |
60530afe | 232 | int sysdev_register(struct sys_device *sysdev) |
1da177e4 LT |
233 | { |
234 | int error; | |
60530afe | 235 | struct sysdev_class *cls = sysdev->cls; |
1da177e4 LT |
236 | |
237 | if (!cls) | |
238 | return -EINVAL; | |
239 | ||
838ea8e8 BD |
240 | pr_debug("Registering sys device of class '%s'\n", |
241 | kobject_name(&cls->kset.kobj)); | |
61030bfb | 242 | |
ef79df26 GKH |
243 | /* initialize the kobject to 0, in case it had previously been used */ |
244 | memset(&sysdev->kobj, 0x00, sizeof(struct kobject)); | |
245 | ||
1da177e4 LT |
246 | /* Make sure the kset is set */ |
247 | sysdev->kobj.kset = &cls->kset; | |
248 | ||
1da177e4 | 249 | /* Register the object */ |
61030bfb GKH |
250 | error = kobject_init_and_add(&sysdev->kobj, &ktype_sysdev, NULL, |
251 | "%s%d", kobject_name(&cls->kset.kobj), | |
252 | sysdev->id); | |
1da177e4 LT |
253 | |
254 | if (!error) { | |
60530afe | 255 | struct sysdev_driver *drv; |
1da177e4 | 256 | |
838ea8e8 BD |
257 | pr_debug("Registering sys device '%s'\n", |
258 | kobject_name(&sysdev->kobj)); | |
259 | ||
9f3f776b | 260 | mutex_lock(&sysdev_drivers_lock); |
1da177e4 LT |
261 | /* Generic notification is implicit, because it's that |
262 | * code that should have called us. | |
263 | */ | |
264 | ||
1da177e4 LT |
265 | /* Notify class auxillary drivers */ |
266 | list_for_each_entry(drv, &cls->drivers, entry) { | |
267 | if (drv->add) | |
268 | drv->add(sysdev); | |
269 | } | |
9f3f776b | 270 | mutex_unlock(&sysdev_drivers_lock); |
1da177e4 | 271 | } |
838ea8e8 | 272 | |
61030bfb | 273 | kobject_uevent(&sysdev->kobj, KOBJ_ADD); |
1da177e4 LT |
274 | return error; |
275 | } | |
276 | ||
60530afe | 277 | void sysdev_unregister(struct sys_device *sysdev) |
1da177e4 | 278 | { |
60530afe | 279 | struct sysdev_driver *drv; |
1da177e4 | 280 | |
9f3f776b | 281 | mutex_lock(&sysdev_drivers_lock); |
1da177e4 LT |
282 | list_for_each_entry(drv, &sysdev->cls->drivers, entry) { |
283 | if (drv->remove) | |
284 | drv->remove(sysdev); | |
285 | } | |
9f3f776b | 286 | mutex_unlock(&sysdev_drivers_lock); |
1da177e4 | 287 | |
c10997f6 | 288 | kobject_put(&sysdev->kobj); |
1da177e4 LT |
289 | } |
290 | ||
291 | ||
292 | ||
293 | /** | |
294 | * sysdev_shutdown - Shut down all system devices. | |
295 | * | |
296 | * Loop over each class of system devices, and the devices in each | |
297 | * of those classes. For each device, we call the shutdown method for | |
44b760a8 | 298 | * each driver registered for the device - the auxillaries, |
1da177e4 LT |
299 | * and the class driver. |
300 | * | |
301 | * Note: The list is iterated in reverse order, so that we shut down | |
302 | * child devices before we shut down thier parents. The list ordering | |
303 | * is guaranteed by virtue of the fact that child devices are registered | |
304 | * after their parents. | |
305 | */ | |
1da177e4 LT |
306 | void sysdev_shutdown(void) |
307 | { | |
60530afe | 308 | struct sysdev_class *cls; |
1da177e4 LT |
309 | |
310 | pr_debug("Shutting Down System Devices\n"); | |
311 | ||
9f3f776b | 312 | mutex_lock(&sysdev_drivers_lock); |
aade4041 | 313 | list_for_each_entry_reverse(cls, &system_kset->list, kset.kobj.entry) { |
60530afe | 314 | struct sys_device *sysdev; |
1da177e4 LT |
315 | |
316 | pr_debug("Shutting down type '%s':\n", | |
317 | kobject_name(&cls->kset.kobj)); | |
318 | ||
319 | list_for_each_entry(sysdev, &cls->kset.list, kobj.entry) { | |
60530afe | 320 | struct sysdev_driver *drv; |
1da177e4 LT |
321 | pr_debug(" %s\n", kobject_name(&sysdev->kobj)); |
322 | ||
44b760a8 | 323 | /* Call auxillary drivers first */ |
1da177e4 LT |
324 | list_for_each_entry(drv, &cls->drivers, entry) { |
325 | if (drv->shutdown) | |
326 | drv->shutdown(sysdev); | |
327 | } | |
328 | ||
329 | /* Now call the generic one */ | |
330 | if (cls->shutdown) | |
331 | cls->shutdown(sysdev); | |
332 | } | |
333 | } | |
9f3f776b | 334 | mutex_unlock(&sysdev_drivers_lock); |
1da177e4 LT |
335 | } |
336 | ||
ceaeade1 SL |
337 | static void __sysdev_resume(struct sys_device *dev) |
338 | { | |
339 | struct sysdev_class *cls = dev->cls; | |
340 | struct sysdev_driver *drv; | |
341 | ||
342 | /* First, call the class-specific one */ | |
343 | if (cls->resume) | |
344 | cls->resume(dev); | |
345 | ||
346 | /* Call auxillary drivers next. */ | |
347 | list_for_each_entry(drv, &cls->drivers, entry) { | |
348 | if (drv->resume) | |
349 | drv->resume(dev); | |
350 | } | |
ceaeade1 | 351 | } |
1da177e4 LT |
352 | |
353 | /** | |
354 | * sysdev_suspend - Suspend all system devices. | |
355 | * @state: Power state to enter. | |
356 | * | |
65151365 | 357 | * We perform an almost identical operation as sysdev_shutdown() |
1da177e4 LT |
358 | * above, though calling ->suspend() instead. Interrupts are disabled |
359 | * when this called. Devices are responsible for both saving state and | |
360 | * quiescing or powering down the device. | |
361 | * | |
362 | * This is only called by the device PM core, so we let them handle | |
363 | * all synchronization. | |
364 | */ | |
438510f6 | 365 | int sysdev_suspend(pm_message_t state) |
1da177e4 | 366 | { |
60530afe | 367 | struct sysdev_class *cls; |
ceaeade1 SL |
368 | struct sys_device *sysdev, *err_dev; |
369 | struct sysdev_driver *drv, *err_drv; | |
370 | int ret; | |
1da177e4 LT |
371 | |
372 | pr_debug("Suspending System Devices\n"); | |
373 | ||
aade4041 | 374 | list_for_each_entry_reverse(cls, &system_kset->list, kset.kobj.entry) { |
1da177e4 LT |
375 | pr_debug("Suspending type '%s':\n", |
376 | kobject_name(&cls->kset.kobj)); | |
377 | ||
378 | list_for_each_entry(sysdev, &cls->kset.list, kobj.entry) { | |
1da177e4 LT |
379 | pr_debug(" %s\n", kobject_name(&sysdev->kobj)); |
380 | ||
44b760a8 | 381 | /* Call auxillary drivers first */ |
1da177e4 | 382 | list_for_each_entry(drv, &cls->drivers, entry) { |
ceaeade1 SL |
383 | if (drv->suspend) { |
384 | ret = drv->suspend(sysdev, state); | |
385 | if (ret) | |
386 | goto aux_driver; | |
387 | } | |
1da177e4 LT |
388 | } |
389 | ||
390 | /* Now call the generic one */ | |
ceaeade1 SL |
391 | if (cls->suspend) { |
392 | ret = cls->suspend(sysdev, state); | |
393 | if (ret) | |
394 | goto cls_driver; | |
395 | } | |
1da177e4 LT |
396 | } |
397 | } | |
398 | return 0; | |
ceaeade1 SL |
399 | /* resume current sysdev */ |
400 | cls_driver: | |
401 | drv = NULL; | |
402 | printk(KERN_ERR "Class suspend failed for %s\n", | |
403 | kobject_name(&sysdev->kobj)); | |
404 | ||
405 | aux_driver: | |
406 | if (drv) | |
407 | printk(KERN_ERR "Class driver suspend failed for %s\n", | |
408 | kobject_name(&sysdev->kobj)); | |
409 | list_for_each_entry(err_drv, &cls->drivers, entry) { | |
410 | if (err_drv == drv) | |
411 | break; | |
412 | if (err_drv->resume) | |
413 | err_drv->resume(sysdev); | |
414 | } | |
ceaeade1 | 415 | |
ceaeade1 SL |
416 | /* resume other sysdevs in current class */ |
417 | list_for_each_entry(err_dev, &cls->kset.list, kobj.entry) { | |
418 | if (err_dev == sysdev) | |
419 | break; | |
420 | pr_debug(" %s\n", kobject_name(&err_dev->kobj)); | |
421 | __sysdev_resume(err_dev); | |
422 | } | |
423 | ||
424 | /* resume other classes */ | |
aade4041 | 425 | list_for_each_entry_continue(cls, &system_kset->list, kset.kobj.entry) { |
ceaeade1 SL |
426 | list_for_each_entry(err_dev, &cls->kset.list, kobj.entry) { |
427 | pr_debug(" %s\n", kobject_name(&err_dev->kobj)); | |
428 | __sysdev_resume(err_dev); | |
429 | } | |
430 | } | |
431 | return ret; | |
1da177e4 | 432 | } |
0f99fed4 | 433 | EXPORT_SYMBOL_GPL(sysdev_suspend); |
1da177e4 LT |
434 | |
435 | /** | |
436 | * sysdev_resume - Bring system devices back to life. | |
437 | * | |
65151365 | 438 | * Similar to sysdev_suspend(), but we iterate the list forwards |
1da177e4 LT |
439 | * to guarantee that parent devices are resumed before their children. |
440 | * | |
441 | * Note: Interrupts are disabled when called. | |
442 | */ | |
1da177e4 LT |
443 | int sysdev_resume(void) |
444 | { | |
60530afe | 445 | struct sysdev_class *cls; |
1da177e4 LT |
446 | |
447 | pr_debug("Resuming System Devices\n"); | |
448 | ||
aade4041 | 449 | list_for_each_entry(cls, &system_kset->list, kset.kobj.entry) { |
60530afe | 450 | struct sys_device *sysdev; |
1da177e4 LT |
451 | |
452 | pr_debug("Resuming type '%s':\n", | |
453 | kobject_name(&cls->kset.kobj)); | |
454 | ||
455 | list_for_each_entry(sysdev, &cls->kset.list, kobj.entry) { | |
1da177e4 LT |
456 | pr_debug(" %s\n", kobject_name(&sysdev->kobj)); |
457 | ||
ceaeade1 | 458 | __sysdev_resume(sysdev); |
1da177e4 LT |
459 | } |
460 | } | |
461 | return 0; | |
462 | } | |
0f99fed4 | 463 | EXPORT_SYMBOL_GPL(sysdev_resume); |
1da177e4 LT |
464 | |
465 | int __init system_bus_init(void) | |
466 | { | |
aade4041 GKH |
467 | system_kset = kset_create_and_add("system", NULL, &devices_kset->kobj); |
468 | if (!system_kset) | |
469 | return -ENOMEM; | |
470 | return 0; | |
1da177e4 LT |
471 | } |
472 | ||
473 | EXPORT_SYMBOL_GPL(sysdev_register); | |
474 | EXPORT_SYMBOL_GPL(sysdev_unregister); | |
9800794a AK |
475 | |
476 | #define to_ext_attr(x) container_of(x, struct sysdev_ext_attribute, attr) | |
477 | ||
478 | ssize_t sysdev_store_ulong(struct sys_device *sysdev, | |
479 | struct sysdev_attribute *attr, | |
480 | const char *buf, size_t size) | |
481 | { | |
482 | struct sysdev_ext_attribute *ea = to_ext_attr(attr); | |
483 | char *end; | |
484 | unsigned long new = simple_strtoul(buf, &end, 0); | |
485 | if (end == buf) | |
486 | return -EINVAL; | |
487 | *(unsigned long *)(ea->var) = new; | |
4e318d7c AK |
488 | /* Always return full write size even if we didn't consume all */ |
489 | return size; | |
9800794a AK |
490 | } |
491 | EXPORT_SYMBOL_GPL(sysdev_store_ulong); | |
492 | ||
493 | ssize_t sysdev_show_ulong(struct sys_device *sysdev, | |
494 | struct sysdev_attribute *attr, | |
495 | char *buf) | |
496 | { | |
497 | struct sysdev_ext_attribute *ea = to_ext_attr(attr); | |
498 | return snprintf(buf, PAGE_SIZE, "%lx\n", *(unsigned long *)(ea->var)); | |
499 | } | |
500 | EXPORT_SYMBOL_GPL(sysdev_show_ulong); | |
501 | ||
502 | ssize_t sysdev_store_int(struct sys_device *sysdev, | |
503 | struct sysdev_attribute *attr, | |
504 | const char *buf, size_t size) | |
505 | { | |
506 | struct sysdev_ext_attribute *ea = to_ext_attr(attr); | |
507 | char *end; | |
508 | long new = simple_strtol(buf, &end, 0); | |
509 | if (end == buf || new > INT_MAX || new < INT_MIN) | |
510 | return -EINVAL; | |
511 | *(int *)(ea->var) = new; | |
4e318d7c AK |
512 | /* Always return full write size even if we didn't consume all */ |
513 | return size; | |
9800794a AK |
514 | } |
515 | EXPORT_SYMBOL_GPL(sysdev_store_int); | |
516 | ||
517 | ssize_t sysdev_show_int(struct sys_device *sysdev, | |
518 | struct sysdev_attribute *attr, | |
519 | char *buf) | |
520 | { | |
521 | struct sysdev_ext_attribute *ea = to_ext_attr(attr); | |
522 | return snprintf(buf, PAGE_SIZE, "%d\n", *(int *)(ea->var)); | |
523 | } | |
524 | EXPORT_SYMBOL_GPL(sysdev_show_int); | |
525 |