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> |
2ed8d2b3 | 25 | #include <linux/interrupt.h> |
1da177e4 | 26 | |
f67d115f AB |
27 | #include "base.h" |
28 | ||
1da177e4 LT |
29 | #define to_sysdev(k) container_of(k, struct sys_device, kobj) |
30 | #define to_sysdev_attr(a) container_of(a, struct sysdev_attribute, attr) | |
31 | ||
32 | ||
33 | static ssize_t | |
60530afe | 34 | sysdev_show(struct kobject *kobj, struct attribute *attr, char *buffer) |
1da177e4 | 35 | { |
60530afe ZX |
36 | struct sys_device *sysdev = to_sysdev(kobj); |
37 | struct sysdev_attribute *sysdev_attr = to_sysdev_attr(attr); | |
1da177e4 LT |
38 | |
39 | if (sysdev_attr->show) | |
4a0b2b4d | 40 | return sysdev_attr->show(sysdev, sysdev_attr, buffer); |
4a0c20bf | 41 | return -EIO; |
1da177e4 LT |
42 | } |
43 | ||
44 | ||
45 | static ssize_t | |
60530afe ZX |
46 | sysdev_store(struct kobject *kobj, struct attribute *attr, |
47 | const char *buffer, size_t count) | |
1da177e4 | 48 | { |
60530afe ZX |
49 | struct sys_device *sysdev = to_sysdev(kobj); |
50 | struct sysdev_attribute *sysdev_attr = to_sysdev_attr(attr); | |
1da177e4 LT |
51 | |
52 | if (sysdev_attr->store) | |
4a0b2b4d | 53 | return sysdev_attr->store(sysdev, sysdev_attr, buffer, count); |
4a0c20bf | 54 | return -EIO; |
1da177e4 LT |
55 | } |
56 | ||
57 | static struct sysfs_ops sysfs_ops = { | |
58 | .show = sysdev_show, | |
59 | .store = sysdev_store, | |
60 | }; | |
61 | ||
62 | static struct kobj_type ktype_sysdev = { | |
63 | .sysfs_ops = &sysfs_ops, | |
64 | }; | |
65 | ||
66 | ||
60530afe | 67 | int sysdev_create_file(struct sys_device *s, struct sysdev_attribute *a) |
1da177e4 LT |
68 | { |
69 | return sysfs_create_file(&s->kobj, &a->attr); | |
70 | } | |
71 | ||
72 | ||
60530afe | 73 | void sysdev_remove_file(struct sys_device *s, struct sysdev_attribute *a) |
1da177e4 LT |
74 | { |
75 | sysfs_remove_file(&s->kobj, &a->attr); | |
76 | } | |
77 | ||
78 | EXPORT_SYMBOL_GPL(sysdev_create_file); | |
79 | EXPORT_SYMBOL_GPL(sysdev_remove_file); | |
80 | ||
670dd90d SL |
81 | #define to_sysdev_class(k) container_of(k, struct sysdev_class, kset.kobj) |
82 | #define to_sysdev_class_attr(a) container_of(a, \ | |
83 | struct sysdev_class_attribute, attr) | |
84 | ||
85 | static ssize_t sysdev_class_show(struct kobject *kobj, struct attribute *attr, | |
86 | char *buffer) | |
87 | { | |
60530afe | 88 | struct sysdev_class *class = to_sysdev_class(kobj); |
670dd90d SL |
89 | struct sysdev_class_attribute *class_attr = to_sysdev_class_attr(attr); |
90 | ||
91 | if (class_attr->show) | |
92 | return class_attr->show(class, buffer); | |
93 | return -EIO; | |
94 | } | |
95 | ||
96 | static ssize_t sysdev_class_store(struct kobject *kobj, struct attribute *attr, | |
97 | const char *buffer, size_t count) | |
98 | { | |
60530afe ZX |
99 | struct sysdev_class *class = to_sysdev_class(kobj); |
100 | struct sysdev_class_attribute *class_attr = to_sysdev_class_attr(attr); | |
670dd90d SL |
101 | |
102 | if (class_attr->store) | |
103 | return class_attr->store(class, buffer, count); | |
104 | return -EIO; | |
105 | } | |
106 | ||
107 | static struct sysfs_ops sysfs_class_ops = { | |
108 | .show = sysdev_class_show, | |
109 | .store = sysdev_class_store, | |
110 | }; | |
111 | ||
112 | static struct kobj_type ktype_sysdev_class = { | |
113 | .sysfs_ops = &sysfs_class_ops, | |
114 | }; | |
115 | ||
116 | int sysdev_class_create_file(struct sysdev_class *c, | |
117 | struct sysdev_class_attribute *a) | |
118 | { | |
119 | return sysfs_create_file(&c->kset.kobj, &a->attr); | |
120 | } | |
121 | EXPORT_SYMBOL_GPL(sysdev_class_create_file); | |
122 | ||
123 | void sysdev_class_remove_file(struct sysdev_class *c, | |
124 | struct sysdev_class_attribute *a) | |
125 | { | |
126 | sysfs_remove_file(&c->kset.kobj, &a->attr); | |
127 | } | |
128 | EXPORT_SYMBOL_GPL(sysdev_class_remove_file); | |
129 | ||
aade4041 | 130 | static struct kset *system_kset; |
1da177e4 | 131 | |
60530afe | 132 | int sysdev_class_register(struct sysdev_class *cls) |
1da177e4 | 133 | { |
838ea8e8 BD |
134 | pr_debug("Registering sysdev class '%s'\n", cls->name); |
135 | ||
1da177e4 | 136 | INIT_LIST_HEAD(&cls->drivers); |
ef79df26 | 137 | memset(&cls->kset.kobj, 0x00, sizeof(struct kobject)); |
aade4041 | 138 | cls->kset.kobj.parent = &system_kset->kobj; |
3514faca | 139 | cls->kset.kobj.ktype = &ktype_sysdev_class; |
aade4041 | 140 | cls->kset.kobj.kset = system_kset; |
af5ca3f4 | 141 | kobject_set_name(&cls->kset.kobj, cls->name); |
1da177e4 LT |
142 | return kset_register(&cls->kset); |
143 | } | |
144 | ||
60530afe | 145 | void sysdev_class_unregister(struct sysdev_class *cls) |
1da177e4 LT |
146 | { |
147 | pr_debug("Unregistering sysdev class '%s'\n", | |
148 | kobject_name(&cls->kset.kobj)); | |
149 | kset_unregister(&cls->kset); | |
150 | } | |
151 | ||
152 | EXPORT_SYMBOL_GPL(sysdev_class_register); | |
153 | EXPORT_SYMBOL_GPL(sysdev_class_unregister); | |
154 | ||
9f3f776b | 155 | static DEFINE_MUTEX(sysdev_drivers_lock); |
1da177e4 LT |
156 | |
157 | /** | |
158 | * sysdev_driver_register - Register auxillary driver | |
44b760a8 | 159 | * @cls: Device class driver belongs to. |
1da177e4 LT |
160 | * @drv: Driver. |
161 | * | |
44b760a8 | 162 | * @drv is inserted into @cls->drivers to be |
1da177e4 LT |
163 | * called on each operation on devices of that class. The refcount |
164 | * of @cls is incremented. | |
1da177e4 LT |
165 | */ |
166 | ||
44b760a8 | 167 | int sysdev_driver_register(struct sysdev_class *cls, struct sysdev_driver *drv) |
1da177e4 | 168 | { |
44b760a8 AM |
169 | int err = 0; |
170 | ||
da009f39 | 171 | if (!cls) { |
f810a5cf | 172 | WARN(1, KERN_WARNING "sysdev: invalid class passed to " |
da009f39 | 173 | "sysdev_driver_register!\n"); |
da009f39 BD |
174 | return -EINVAL; |
175 | } | |
176 | ||
177 | /* Check whether this driver has already been added to a class. */ | |
f810a5cf AV |
178 | if (drv->entry.next && !list_empty(&drv->entry)) |
179 | WARN(1, KERN_WARNING "sysdev: class %s: driver (%p) has already" | |
da009f39 BD |
180 | " been registered to a class, something is wrong, but " |
181 | "will forge on!\n", cls->name, drv); | |
da009f39 | 182 | |
9f3f776b | 183 | mutex_lock(&sysdev_drivers_lock); |
1da177e4 LT |
184 | if (cls && kset_get(&cls->kset)) { |
185 | list_add_tail(&drv->entry, &cls->drivers); | |
186 | ||
187 | /* If devices of this class already exist, tell the driver */ | |
188 | if (drv->add) { | |
189 | struct sys_device *dev; | |
190 | list_for_each_entry(dev, &cls->kset.list, kobj.entry) | |
191 | drv->add(dev); | |
192 | } | |
44b760a8 AM |
193 | } else { |
194 | err = -EINVAL; | |
f810a5cf | 195 | WARN(1, KERN_ERR "%s: invalid device class\n", __func__); |
44b760a8 | 196 | } |
9f3f776b | 197 | mutex_unlock(&sysdev_drivers_lock); |
44b760a8 | 198 | return err; |
1da177e4 LT |
199 | } |
200 | ||
201 | ||
202 | /** | |
203 | * sysdev_driver_unregister - Remove an auxillary driver. | |
204 | * @cls: Class driver belongs to. | |
205 | * @drv: Driver. | |
206 | */ | |
60530afe ZX |
207 | void sysdev_driver_unregister(struct sysdev_class *cls, |
208 | struct sysdev_driver *drv) | |
1da177e4 | 209 | { |
9f3f776b | 210 | mutex_lock(&sysdev_drivers_lock); |
1da177e4 LT |
211 | list_del_init(&drv->entry); |
212 | if (cls) { | |
213 | if (drv->remove) { | |
214 | struct sys_device *dev; | |
215 | list_for_each_entry(dev, &cls->kset.list, kobj.entry) | |
216 | drv->remove(dev); | |
217 | } | |
218 | kset_put(&cls->kset); | |
219 | } | |
9f3f776b | 220 | mutex_unlock(&sysdev_drivers_lock); |
1da177e4 LT |
221 | } |
222 | ||
223 | EXPORT_SYMBOL_GPL(sysdev_driver_register); | |
224 | EXPORT_SYMBOL_GPL(sysdev_driver_unregister); | |
225 | ||
226 | ||
227 | ||
228 | /** | |
229 | * sysdev_register - add a system device to the tree | |
230 | * @sysdev: device in question | |
231 | * | |
232 | */ | |
60530afe | 233 | int sysdev_register(struct sys_device *sysdev) |
1da177e4 LT |
234 | { |
235 | int error; | |
60530afe | 236 | struct sysdev_class *cls = sysdev->cls; |
1da177e4 LT |
237 | |
238 | if (!cls) | |
239 | return -EINVAL; | |
240 | ||
838ea8e8 BD |
241 | pr_debug("Registering sys device of class '%s'\n", |
242 | kobject_name(&cls->kset.kobj)); | |
61030bfb | 243 | |
ef79df26 GKH |
244 | /* initialize the kobject to 0, in case it had previously been used */ |
245 | memset(&sysdev->kobj, 0x00, sizeof(struct kobject)); | |
246 | ||
1da177e4 LT |
247 | /* Make sure the kset is set */ |
248 | sysdev->kobj.kset = &cls->kset; | |
249 | ||
1da177e4 | 250 | /* Register the object */ |
61030bfb GKH |
251 | error = kobject_init_and_add(&sysdev->kobj, &ktype_sysdev, NULL, |
252 | "%s%d", kobject_name(&cls->kset.kobj), | |
253 | sysdev->id); | |
1da177e4 LT |
254 | |
255 | if (!error) { | |
60530afe | 256 | struct sysdev_driver *drv; |
1da177e4 | 257 | |
838ea8e8 BD |
258 | pr_debug("Registering sys device '%s'\n", |
259 | kobject_name(&sysdev->kobj)); | |
260 | ||
9f3f776b | 261 | mutex_lock(&sysdev_drivers_lock); |
1da177e4 LT |
262 | /* Generic notification is implicit, because it's that |
263 | * code that should have called us. | |
264 | */ | |
265 | ||
1da177e4 LT |
266 | /* Notify class auxillary drivers */ |
267 | list_for_each_entry(drv, &cls->drivers, entry) { | |
268 | if (drv->add) | |
269 | drv->add(sysdev); | |
270 | } | |
9f3f776b | 271 | mutex_unlock(&sysdev_drivers_lock); |
1da177e4 | 272 | } |
838ea8e8 | 273 | |
61030bfb | 274 | kobject_uevent(&sysdev->kobj, KOBJ_ADD); |
1da177e4 LT |
275 | return error; |
276 | } | |
277 | ||
60530afe | 278 | void sysdev_unregister(struct sys_device *sysdev) |
1da177e4 | 279 | { |
60530afe | 280 | struct sysdev_driver *drv; |
1da177e4 | 281 | |
9f3f776b | 282 | mutex_lock(&sysdev_drivers_lock); |
1da177e4 LT |
283 | list_for_each_entry(drv, &sysdev->cls->drivers, entry) { |
284 | if (drv->remove) | |
285 | drv->remove(sysdev); | |
286 | } | |
9f3f776b | 287 | mutex_unlock(&sysdev_drivers_lock); |
1da177e4 | 288 | |
c10997f6 | 289 | kobject_put(&sysdev->kobj); |
1da177e4 LT |
290 | } |
291 | ||
292 | ||
293 | ||
294 | /** | |
295 | * sysdev_shutdown - Shut down all system devices. | |
296 | * | |
297 | * Loop over each class of system devices, and the devices in each | |
298 | * of those classes. For each device, we call the shutdown method for | |
44b760a8 | 299 | * each driver registered for the device - the auxillaries, |
1da177e4 LT |
300 | * and the class driver. |
301 | * | |
302 | * Note: The list is iterated in reverse order, so that we shut down | |
303 | * child devices before we shut down thier parents. The list ordering | |
304 | * is guaranteed by virtue of the fact that child devices are registered | |
305 | * after their parents. | |
306 | */ | |
1da177e4 LT |
307 | void sysdev_shutdown(void) |
308 | { | |
60530afe | 309 | struct sysdev_class *cls; |
1da177e4 LT |
310 | |
311 | pr_debug("Shutting Down System Devices\n"); | |
312 | ||
9f3f776b | 313 | mutex_lock(&sysdev_drivers_lock); |
aade4041 | 314 | list_for_each_entry_reverse(cls, &system_kset->list, kset.kobj.entry) { |
60530afe | 315 | struct sys_device *sysdev; |
1da177e4 LT |
316 | |
317 | pr_debug("Shutting down type '%s':\n", | |
318 | kobject_name(&cls->kset.kobj)); | |
319 | ||
320 | list_for_each_entry(sysdev, &cls->kset.list, kobj.entry) { | |
60530afe | 321 | struct sysdev_driver *drv; |
1da177e4 LT |
322 | pr_debug(" %s\n", kobject_name(&sysdev->kobj)); |
323 | ||
44b760a8 | 324 | /* Call auxillary drivers first */ |
1da177e4 LT |
325 | list_for_each_entry(drv, &cls->drivers, entry) { |
326 | if (drv->shutdown) | |
327 | drv->shutdown(sysdev); | |
328 | } | |
329 | ||
330 | /* Now call the generic one */ | |
331 | if (cls->shutdown) | |
332 | cls->shutdown(sysdev); | |
333 | } | |
334 | } | |
9f3f776b | 335 | mutex_unlock(&sysdev_drivers_lock); |
1da177e4 LT |
336 | } |
337 | ||
ceaeade1 SL |
338 | static void __sysdev_resume(struct sys_device *dev) |
339 | { | |
340 | struct sysdev_class *cls = dev->cls; | |
341 | struct sysdev_driver *drv; | |
342 | ||
343 | /* First, call the class-specific one */ | |
344 | if (cls->resume) | |
345 | cls->resume(dev); | |
346 | ||
347 | /* Call auxillary drivers next. */ | |
348 | list_for_each_entry(drv, &cls->drivers, entry) { | |
349 | if (drv->resume) | |
350 | drv->resume(dev); | |
351 | } | |
ceaeade1 | 352 | } |
1da177e4 LT |
353 | |
354 | /** | |
355 | * sysdev_suspend - Suspend all system devices. | |
356 | * @state: Power state to enter. | |
357 | * | |
65151365 | 358 | * We perform an almost identical operation as sysdev_shutdown() |
1da177e4 LT |
359 | * above, though calling ->suspend() instead. Interrupts are disabled |
360 | * when this called. Devices are responsible for both saving state and | |
361 | * quiescing or powering down the device. | |
362 | * | |
363 | * This is only called by the device PM core, so we let them handle | |
364 | * all synchronization. | |
365 | */ | |
438510f6 | 366 | int sysdev_suspend(pm_message_t state) |
1da177e4 | 367 | { |
60530afe | 368 | struct sysdev_class *cls; |
ceaeade1 SL |
369 | struct sys_device *sysdev, *err_dev; |
370 | struct sysdev_driver *drv, *err_drv; | |
371 | int ret; | |
1da177e4 | 372 | |
2ed8d2b3 RW |
373 | pr_debug("Checking wake-up interrupts\n"); |
374 | ||
375 | /* Return error code if there are any wake-up interrupts pending */ | |
376 | ret = check_wakeup_irqs(); | |
377 | if (ret) | |
378 | return ret; | |
379 | ||
1da177e4 LT |
380 | pr_debug("Suspending System Devices\n"); |
381 | ||
aade4041 | 382 | list_for_each_entry_reverse(cls, &system_kset->list, kset.kobj.entry) { |
1da177e4 LT |
383 | pr_debug("Suspending type '%s':\n", |
384 | kobject_name(&cls->kset.kobj)); | |
385 | ||
386 | list_for_each_entry(sysdev, &cls->kset.list, kobj.entry) { | |
1da177e4 LT |
387 | pr_debug(" %s\n", kobject_name(&sysdev->kobj)); |
388 | ||
44b760a8 | 389 | /* Call auxillary drivers first */ |
1da177e4 | 390 | list_for_each_entry(drv, &cls->drivers, entry) { |
ceaeade1 SL |
391 | if (drv->suspend) { |
392 | ret = drv->suspend(sysdev, state); | |
393 | if (ret) | |
394 | goto aux_driver; | |
395 | } | |
1da177e4 LT |
396 | } |
397 | ||
398 | /* Now call the generic one */ | |
ceaeade1 SL |
399 | if (cls->suspend) { |
400 | ret = cls->suspend(sysdev, state); | |
401 | if (ret) | |
402 | goto cls_driver; | |
403 | } | |
1da177e4 LT |
404 | } |
405 | } | |
406 | return 0; | |
ceaeade1 SL |
407 | /* resume current sysdev */ |
408 | cls_driver: | |
409 | drv = NULL; | |
410 | printk(KERN_ERR "Class suspend failed for %s\n", | |
411 | kobject_name(&sysdev->kobj)); | |
412 | ||
413 | aux_driver: | |
414 | if (drv) | |
415 | printk(KERN_ERR "Class driver suspend failed for %s\n", | |
416 | kobject_name(&sysdev->kobj)); | |
417 | list_for_each_entry(err_drv, &cls->drivers, entry) { | |
418 | if (err_drv == drv) | |
419 | break; | |
420 | if (err_drv->resume) | |
421 | err_drv->resume(sysdev); | |
422 | } | |
ceaeade1 | 423 | |
ceaeade1 SL |
424 | /* resume other sysdevs in current class */ |
425 | list_for_each_entry(err_dev, &cls->kset.list, kobj.entry) { | |
426 | if (err_dev == sysdev) | |
427 | break; | |
428 | pr_debug(" %s\n", kobject_name(&err_dev->kobj)); | |
429 | __sysdev_resume(err_dev); | |
430 | } | |
431 | ||
432 | /* resume other classes */ | |
aade4041 | 433 | list_for_each_entry_continue(cls, &system_kset->list, kset.kobj.entry) { |
ceaeade1 SL |
434 | list_for_each_entry(err_dev, &cls->kset.list, kobj.entry) { |
435 | pr_debug(" %s\n", kobject_name(&err_dev->kobj)); | |
436 | __sysdev_resume(err_dev); | |
437 | } | |
438 | } | |
439 | return ret; | |
1da177e4 | 440 | } |
0f99fed4 | 441 | EXPORT_SYMBOL_GPL(sysdev_suspend); |
1da177e4 LT |
442 | |
443 | /** | |
444 | * sysdev_resume - Bring system devices back to life. | |
445 | * | |
65151365 | 446 | * Similar to sysdev_suspend(), but we iterate the list forwards |
1da177e4 LT |
447 | * to guarantee that parent devices are resumed before their children. |
448 | * | |
449 | * Note: Interrupts are disabled when called. | |
450 | */ | |
1da177e4 LT |
451 | int sysdev_resume(void) |
452 | { | |
60530afe | 453 | struct sysdev_class *cls; |
1da177e4 LT |
454 | |
455 | pr_debug("Resuming System Devices\n"); | |
456 | ||
aade4041 | 457 | list_for_each_entry(cls, &system_kset->list, kset.kobj.entry) { |
60530afe | 458 | struct sys_device *sysdev; |
1da177e4 LT |
459 | |
460 | pr_debug("Resuming type '%s':\n", | |
461 | kobject_name(&cls->kset.kobj)); | |
462 | ||
463 | list_for_each_entry(sysdev, &cls->kset.list, kobj.entry) { | |
1da177e4 LT |
464 | pr_debug(" %s\n", kobject_name(&sysdev->kobj)); |
465 | ||
ceaeade1 | 466 | __sysdev_resume(sysdev); |
1da177e4 LT |
467 | } |
468 | } | |
469 | return 0; | |
470 | } | |
0f99fed4 | 471 | EXPORT_SYMBOL_GPL(sysdev_resume); |
1da177e4 LT |
472 | |
473 | int __init system_bus_init(void) | |
474 | { | |
aade4041 GKH |
475 | system_kset = kset_create_and_add("system", NULL, &devices_kset->kobj); |
476 | if (!system_kset) | |
477 | return -ENOMEM; | |
478 | return 0; | |
1da177e4 LT |
479 | } |
480 | ||
481 | EXPORT_SYMBOL_GPL(sysdev_register); | |
482 | EXPORT_SYMBOL_GPL(sysdev_unregister); | |
9800794a AK |
483 | |
484 | #define to_ext_attr(x) container_of(x, struct sysdev_ext_attribute, attr) | |
485 | ||
486 | ssize_t sysdev_store_ulong(struct sys_device *sysdev, | |
487 | struct sysdev_attribute *attr, | |
488 | const char *buf, size_t size) | |
489 | { | |
490 | struct sysdev_ext_attribute *ea = to_ext_attr(attr); | |
491 | char *end; | |
492 | unsigned long new = simple_strtoul(buf, &end, 0); | |
493 | if (end == buf) | |
494 | return -EINVAL; | |
495 | *(unsigned long *)(ea->var) = new; | |
4e318d7c AK |
496 | /* Always return full write size even if we didn't consume all */ |
497 | return size; | |
9800794a AK |
498 | } |
499 | EXPORT_SYMBOL_GPL(sysdev_store_ulong); | |
500 | ||
501 | ssize_t sysdev_show_ulong(struct sys_device *sysdev, | |
502 | struct sysdev_attribute *attr, | |
503 | char *buf) | |
504 | { | |
505 | struct sysdev_ext_attribute *ea = to_ext_attr(attr); | |
506 | return snprintf(buf, PAGE_SIZE, "%lx\n", *(unsigned long *)(ea->var)); | |
507 | } | |
508 | EXPORT_SYMBOL_GPL(sysdev_show_ulong); | |
509 | ||
510 | ssize_t sysdev_store_int(struct sys_device *sysdev, | |
511 | struct sysdev_attribute *attr, | |
512 | const char *buf, size_t size) | |
513 | { | |
514 | struct sysdev_ext_attribute *ea = to_ext_attr(attr); | |
515 | char *end; | |
516 | long new = simple_strtol(buf, &end, 0); | |
517 | if (end == buf || new > INT_MAX || new < INT_MIN) | |
518 | return -EINVAL; | |
519 | *(int *)(ea->var) = new; | |
4e318d7c AK |
520 | /* Always return full write size even if we didn't consume all */ |
521 | return size; | |
9800794a AK |
522 | } |
523 | EXPORT_SYMBOL_GPL(sysdev_store_int); | |
524 | ||
525 | ssize_t sysdev_show_int(struct sys_device *sysdev, | |
526 | struct sysdev_attribute *attr, | |
527 | char *buf) | |
528 | { | |
529 | struct sysdev_ext_attribute *ea = to_ext_attr(attr); | |
530 | return snprintf(buf, PAGE_SIZE, "%d\n", *(int *)(ea->var)); | |
531 | } | |
532 | EXPORT_SYMBOL_GPL(sysdev_show_int); | |
533 |