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) | |
c9be0a36 | 92 | return class_attr->show(class, class_attr, buffer); |
670dd90d SL |
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) | |
c9be0a36 | 103 | return class_attr->store(class, class_attr, buffer, count); |
670dd90d SL |
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 | { |
9227c47b DY |
134 | int retval; |
135 | ||
838ea8e8 BD |
136 | pr_debug("Registering sysdev class '%s'\n", cls->name); |
137 | ||
1da177e4 | 138 | INIT_LIST_HEAD(&cls->drivers); |
ef79df26 | 139 | memset(&cls->kset.kobj, 0x00, sizeof(struct kobject)); |
aade4041 | 140 | cls->kset.kobj.parent = &system_kset->kobj; |
3514faca | 141 | cls->kset.kobj.ktype = &ktype_sysdev_class; |
aade4041 | 142 | cls->kset.kobj.kset = system_kset; |
9227c47b | 143 | |
acc0e90f | 144 | retval = kobject_set_name(&cls->kset.kobj, "%s", cls->name); |
9227c47b DY |
145 | if (retval) |
146 | return retval; | |
147 | ||
38457ab3 AK |
148 | retval = kset_register(&cls->kset); |
149 | if (!retval && cls->attrs) | |
150 | retval = sysfs_create_files(&cls->kset.kobj, | |
151 | (const struct attribute **)cls->attrs); | |
152 | return retval; | |
1da177e4 LT |
153 | } |
154 | ||
60530afe | 155 | void sysdev_class_unregister(struct sysdev_class *cls) |
1da177e4 LT |
156 | { |
157 | pr_debug("Unregistering sysdev class '%s'\n", | |
158 | kobject_name(&cls->kset.kobj)); | |
38457ab3 AK |
159 | if (cls->attrs) |
160 | sysfs_remove_files(&cls->kset.kobj, | |
161 | (const struct attribute **)cls->attrs); | |
1da177e4 LT |
162 | kset_unregister(&cls->kset); |
163 | } | |
164 | ||
165 | EXPORT_SYMBOL_GPL(sysdev_class_register); | |
166 | EXPORT_SYMBOL_GPL(sysdev_class_unregister); | |
167 | ||
9f3f776b | 168 | static DEFINE_MUTEX(sysdev_drivers_lock); |
1da177e4 LT |
169 | |
170 | /** | |
171 | * sysdev_driver_register - Register auxillary driver | |
44b760a8 | 172 | * @cls: Device class driver belongs to. |
1da177e4 LT |
173 | * @drv: Driver. |
174 | * | |
44b760a8 | 175 | * @drv is inserted into @cls->drivers to be |
1da177e4 LT |
176 | * called on each operation on devices of that class. The refcount |
177 | * of @cls is incremented. | |
1da177e4 LT |
178 | */ |
179 | ||
44b760a8 | 180 | int sysdev_driver_register(struct sysdev_class *cls, struct sysdev_driver *drv) |
1da177e4 | 181 | { |
44b760a8 AM |
182 | int err = 0; |
183 | ||
da009f39 | 184 | if (!cls) { |
f810a5cf | 185 | WARN(1, KERN_WARNING "sysdev: invalid class passed to " |
da009f39 | 186 | "sysdev_driver_register!\n"); |
da009f39 BD |
187 | return -EINVAL; |
188 | } | |
189 | ||
190 | /* Check whether this driver has already been added to a class. */ | |
f810a5cf AV |
191 | if (drv->entry.next && !list_empty(&drv->entry)) |
192 | WARN(1, KERN_WARNING "sysdev: class %s: driver (%p) has already" | |
da009f39 BD |
193 | " been registered to a class, something is wrong, but " |
194 | "will forge on!\n", cls->name, drv); | |
da009f39 | 195 | |
9f3f776b | 196 | mutex_lock(&sysdev_drivers_lock); |
1da177e4 LT |
197 | if (cls && kset_get(&cls->kset)) { |
198 | list_add_tail(&drv->entry, &cls->drivers); | |
199 | ||
200 | /* If devices of this class already exist, tell the driver */ | |
201 | if (drv->add) { | |
202 | struct sys_device *dev; | |
203 | list_for_each_entry(dev, &cls->kset.list, kobj.entry) | |
204 | drv->add(dev); | |
205 | } | |
44b760a8 AM |
206 | } else { |
207 | err = -EINVAL; | |
f810a5cf | 208 | WARN(1, KERN_ERR "%s: invalid device class\n", __func__); |
44b760a8 | 209 | } |
9f3f776b | 210 | mutex_unlock(&sysdev_drivers_lock); |
44b760a8 | 211 | return err; |
1da177e4 LT |
212 | } |
213 | ||
214 | ||
215 | /** | |
216 | * sysdev_driver_unregister - Remove an auxillary driver. | |
217 | * @cls: Class driver belongs to. | |
218 | * @drv: Driver. | |
219 | */ | |
60530afe ZX |
220 | void sysdev_driver_unregister(struct sysdev_class *cls, |
221 | struct sysdev_driver *drv) | |
1da177e4 | 222 | { |
9f3f776b | 223 | mutex_lock(&sysdev_drivers_lock); |
1da177e4 LT |
224 | list_del_init(&drv->entry); |
225 | if (cls) { | |
226 | if (drv->remove) { | |
227 | struct sys_device *dev; | |
228 | list_for_each_entry(dev, &cls->kset.list, kobj.entry) | |
229 | drv->remove(dev); | |
230 | } | |
231 | kset_put(&cls->kset); | |
232 | } | |
9f3f776b | 233 | mutex_unlock(&sysdev_drivers_lock); |
1da177e4 LT |
234 | } |
235 | ||
236 | EXPORT_SYMBOL_GPL(sysdev_driver_register); | |
237 | EXPORT_SYMBOL_GPL(sysdev_driver_unregister); | |
238 | ||
239 | ||
240 | ||
241 | /** | |
242 | * sysdev_register - add a system device to the tree | |
243 | * @sysdev: device in question | |
244 | * | |
245 | */ | |
60530afe | 246 | int sysdev_register(struct sys_device *sysdev) |
1da177e4 LT |
247 | { |
248 | int error; | |
60530afe | 249 | struct sysdev_class *cls = sysdev->cls; |
1da177e4 LT |
250 | |
251 | if (!cls) | |
252 | return -EINVAL; | |
253 | ||
838ea8e8 BD |
254 | pr_debug("Registering sys device of class '%s'\n", |
255 | kobject_name(&cls->kset.kobj)); | |
61030bfb | 256 | |
ef79df26 GKH |
257 | /* initialize the kobject to 0, in case it had previously been used */ |
258 | memset(&sysdev->kobj, 0x00, sizeof(struct kobject)); | |
259 | ||
1da177e4 LT |
260 | /* Make sure the kset is set */ |
261 | sysdev->kobj.kset = &cls->kset; | |
262 | ||
1da177e4 | 263 | /* Register the object */ |
61030bfb GKH |
264 | error = kobject_init_and_add(&sysdev->kobj, &ktype_sysdev, NULL, |
265 | "%s%d", kobject_name(&cls->kset.kobj), | |
266 | sysdev->id); | |
1da177e4 LT |
267 | |
268 | if (!error) { | |
60530afe | 269 | struct sysdev_driver *drv; |
1da177e4 | 270 | |
838ea8e8 BD |
271 | pr_debug("Registering sys device '%s'\n", |
272 | kobject_name(&sysdev->kobj)); | |
273 | ||
9f3f776b | 274 | mutex_lock(&sysdev_drivers_lock); |
1da177e4 LT |
275 | /* Generic notification is implicit, because it's that |
276 | * code that should have called us. | |
277 | */ | |
278 | ||
1da177e4 LT |
279 | /* Notify class auxillary drivers */ |
280 | list_for_each_entry(drv, &cls->drivers, entry) { | |
281 | if (drv->add) | |
282 | drv->add(sysdev); | |
283 | } | |
9f3f776b | 284 | mutex_unlock(&sysdev_drivers_lock); |
79f0313b | 285 | kobject_uevent(&sysdev->kobj, KOBJ_ADD); |
1da177e4 | 286 | } |
838ea8e8 | 287 | |
1da177e4 LT |
288 | return error; |
289 | } | |
290 | ||
60530afe | 291 | void sysdev_unregister(struct sys_device *sysdev) |
1da177e4 | 292 | { |
60530afe | 293 | struct sysdev_driver *drv; |
1da177e4 | 294 | |
9f3f776b | 295 | mutex_lock(&sysdev_drivers_lock); |
1da177e4 LT |
296 | list_for_each_entry(drv, &sysdev->cls->drivers, entry) { |
297 | if (drv->remove) | |
298 | drv->remove(sysdev); | |
299 | } | |
9f3f776b | 300 | mutex_unlock(&sysdev_drivers_lock); |
1da177e4 | 301 | |
c10997f6 | 302 | kobject_put(&sysdev->kobj); |
1da177e4 LT |
303 | } |
304 | ||
305 | ||
306 | ||
307 | /** | |
308 | * sysdev_shutdown - Shut down all system devices. | |
309 | * | |
310 | * Loop over each class of system devices, and the devices in each | |
311 | * of those classes. For each device, we call the shutdown method for | |
44b760a8 | 312 | * each driver registered for the device - the auxillaries, |
1da177e4 LT |
313 | * and the class driver. |
314 | * | |
315 | * Note: The list is iterated in reverse order, so that we shut down | |
ee6921f7 | 316 | * child devices before we shut down their parents. The list ordering |
1da177e4 LT |
317 | * is guaranteed by virtue of the fact that child devices are registered |
318 | * after their parents. | |
319 | */ | |
1da177e4 LT |
320 | void sysdev_shutdown(void) |
321 | { | |
60530afe | 322 | struct sysdev_class *cls; |
1da177e4 LT |
323 | |
324 | pr_debug("Shutting Down System Devices\n"); | |
325 | ||
9f3f776b | 326 | mutex_lock(&sysdev_drivers_lock); |
aade4041 | 327 | list_for_each_entry_reverse(cls, &system_kset->list, kset.kobj.entry) { |
60530afe | 328 | struct sys_device *sysdev; |
1da177e4 LT |
329 | |
330 | pr_debug("Shutting down type '%s':\n", | |
331 | kobject_name(&cls->kset.kobj)); | |
332 | ||
333 | list_for_each_entry(sysdev, &cls->kset.list, kobj.entry) { | |
60530afe | 334 | struct sysdev_driver *drv; |
1da177e4 LT |
335 | pr_debug(" %s\n", kobject_name(&sysdev->kobj)); |
336 | ||
44b760a8 | 337 | /* Call auxillary drivers first */ |
1da177e4 LT |
338 | list_for_each_entry(drv, &cls->drivers, entry) { |
339 | if (drv->shutdown) | |
340 | drv->shutdown(sysdev); | |
341 | } | |
342 | ||
343 | /* Now call the generic one */ | |
344 | if (cls->shutdown) | |
345 | cls->shutdown(sysdev); | |
346 | } | |
347 | } | |
9f3f776b | 348 | mutex_unlock(&sysdev_drivers_lock); |
1da177e4 LT |
349 | } |
350 | ||
ceaeade1 SL |
351 | static void __sysdev_resume(struct sys_device *dev) |
352 | { | |
353 | struct sysdev_class *cls = dev->cls; | |
354 | struct sysdev_driver *drv; | |
355 | ||
356 | /* First, call the class-specific one */ | |
357 | if (cls->resume) | |
358 | cls->resume(dev); | |
62b01247 RW |
359 | WARN_ONCE(!irqs_disabled(), |
360 | "Interrupts enabled after %pF\n", cls->resume); | |
ceaeade1 SL |
361 | |
362 | /* Call auxillary drivers next. */ | |
363 | list_for_each_entry(drv, &cls->drivers, entry) { | |
364 | if (drv->resume) | |
365 | drv->resume(dev); | |
62b01247 RW |
366 | WARN_ONCE(!irqs_disabled(), |
367 | "Interrupts enabled after %pF\n", drv->resume); | |
ceaeade1 | 368 | } |
ceaeade1 | 369 | } |
1da177e4 LT |
370 | |
371 | /** | |
372 | * sysdev_suspend - Suspend all system devices. | |
373 | * @state: Power state to enter. | |
374 | * | |
65151365 | 375 | * We perform an almost identical operation as sysdev_shutdown() |
1da177e4 LT |
376 | * above, though calling ->suspend() instead. Interrupts are disabled |
377 | * when this called. Devices are responsible for both saving state and | |
378 | * quiescing or powering down the device. | |
379 | * | |
380 | * This is only called by the device PM core, so we let them handle | |
381 | * all synchronization. | |
382 | */ | |
438510f6 | 383 | int sysdev_suspend(pm_message_t state) |
1da177e4 | 384 | { |
60530afe | 385 | struct sysdev_class *cls; |
ceaeade1 SL |
386 | struct sys_device *sysdev, *err_dev; |
387 | struct sysdev_driver *drv, *err_drv; | |
388 | int ret; | |
1da177e4 | 389 | |
2ed8d2b3 RW |
390 | pr_debug("Checking wake-up interrupts\n"); |
391 | ||
392 | /* Return error code if there are any wake-up interrupts pending */ | |
393 | ret = check_wakeup_irqs(); | |
394 | if (ret) | |
395 | return ret; | |
396 | ||
62b01247 RW |
397 | WARN_ONCE(!irqs_disabled(), |
398 | "Interrupts enabled while suspending system devices\n"); | |
399 | ||
1da177e4 LT |
400 | pr_debug("Suspending System Devices\n"); |
401 | ||
aade4041 | 402 | list_for_each_entry_reverse(cls, &system_kset->list, kset.kobj.entry) { |
1da177e4 LT |
403 | pr_debug("Suspending type '%s':\n", |
404 | kobject_name(&cls->kset.kobj)); | |
405 | ||
406 | list_for_each_entry(sysdev, &cls->kset.list, kobj.entry) { | |
1da177e4 LT |
407 | pr_debug(" %s\n", kobject_name(&sysdev->kobj)); |
408 | ||
44b760a8 | 409 | /* Call auxillary drivers first */ |
1da177e4 | 410 | list_for_each_entry(drv, &cls->drivers, entry) { |
ceaeade1 SL |
411 | if (drv->suspend) { |
412 | ret = drv->suspend(sysdev, state); | |
413 | if (ret) | |
414 | goto aux_driver; | |
415 | } | |
62b01247 RW |
416 | WARN_ONCE(!irqs_disabled(), |
417 | "Interrupts enabled after %pF\n", | |
418 | drv->suspend); | |
1da177e4 LT |
419 | } |
420 | ||
421 | /* Now call the generic one */ | |
ceaeade1 SL |
422 | if (cls->suspend) { |
423 | ret = cls->suspend(sysdev, state); | |
424 | if (ret) | |
425 | goto cls_driver; | |
62b01247 RW |
426 | WARN_ONCE(!irqs_disabled(), |
427 | "Interrupts enabled after %pF\n", | |
428 | cls->suspend); | |
ceaeade1 | 429 | } |
1da177e4 LT |
430 | } |
431 | } | |
432 | return 0; | |
ceaeade1 SL |
433 | /* resume current sysdev */ |
434 | cls_driver: | |
435 | drv = NULL; | |
436 | printk(KERN_ERR "Class suspend failed for %s\n", | |
437 | kobject_name(&sysdev->kobj)); | |
438 | ||
439 | aux_driver: | |
440 | if (drv) | |
441 | printk(KERN_ERR "Class driver suspend failed for %s\n", | |
442 | kobject_name(&sysdev->kobj)); | |
443 | list_for_each_entry(err_drv, &cls->drivers, entry) { | |
444 | if (err_drv == drv) | |
445 | break; | |
446 | if (err_drv->resume) | |
447 | err_drv->resume(sysdev); | |
448 | } | |
ceaeade1 | 449 | |
ceaeade1 SL |
450 | /* resume other sysdevs in current class */ |
451 | list_for_each_entry(err_dev, &cls->kset.list, kobj.entry) { | |
452 | if (err_dev == sysdev) | |
453 | break; | |
454 | pr_debug(" %s\n", kobject_name(&err_dev->kobj)); | |
455 | __sysdev_resume(err_dev); | |
456 | } | |
457 | ||
458 | /* resume other classes */ | |
aade4041 | 459 | list_for_each_entry_continue(cls, &system_kset->list, kset.kobj.entry) { |
ceaeade1 SL |
460 | list_for_each_entry(err_dev, &cls->kset.list, kobj.entry) { |
461 | pr_debug(" %s\n", kobject_name(&err_dev->kobj)); | |
462 | __sysdev_resume(err_dev); | |
463 | } | |
464 | } | |
465 | return ret; | |
1da177e4 | 466 | } |
0f99fed4 | 467 | EXPORT_SYMBOL_GPL(sysdev_suspend); |
1da177e4 LT |
468 | |
469 | /** | |
470 | * sysdev_resume - Bring system devices back to life. | |
471 | * | |
65151365 | 472 | * Similar to sysdev_suspend(), but we iterate the list forwards |
1da177e4 LT |
473 | * to guarantee that parent devices are resumed before their children. |
474 | * | |
475 | * Note: Interrupts are disabled when called. | |
476 | */ | |
1da177e4 LT |
477 | int sysdev_resume(void) |
478 | { | |
60530afe | 479 | struct sysdev_class *cls; |
1da177e4 | 480 | |
62b01247 RW |
481 | WARN_ONCE(!irqs_disabled(), |
482 | "Interrupts enabled while resuming system devices\n"); | |
483 | ||
1da177e4 LT |
484 | pr_debug("Resuming System Devices\n"); |
485 | ||
aade4041 | 486 | list_for_each_entry(cls, &system_kset->list, kset.kobj.entry) { |
60530afe | 487 | struct sys_device *sysdev; |
1da177e4 LT |
488 | |
489 | pr_debug("Resuming type '%s':\n", | |
490 | kobject_name(&cls->kset.kobj)); | |
491 | ||
492 | list_for_each_entry(sysdev, &cls->kset.list, kobj.entry) { | |
1da177e4 LT |
493 | pr_debug(" %s\n", kobject_name(&sysdev->kobj)); |
494 | ||
ceaeade1 | 495 | __sysdev_resume(sysdev); |
1da177e4 LT |
496 | } |
497 | } | |
498 | return 0; | |
499 | } | |
0f99fed4 | 500 | EXPORT_SYMBOL_GPL(sysdev_resume); |
1da177e4 LT |
501 | |
502 | int __init system_bus_init(void) | |
503 | { | |
aade4041 GKH |
504 | system_kset = kset_create_and_add("system", NULL, &devices_kset->kobj); |
505 | if (!system_kset) | |
506 | return -ENOMEM; | |
507 | return 0; | |
1da177e4 LT |
508 | } |
509 | ||
510 | EXPORT_SYMBOL_GPL(sysdev_register); | |
511 | EXPORT_SYMBOL_GPL(sysdev_unregister); | |
9800794a AK |
512 | |
513 | #define to_ext_attr(x) container_of(x, struct sysdev_ext_attribute, attr) | |
514 | ||
515 | ssize_t sysdev_store_ulong(struct sys_device *sysdev, | |
516 | struct sysdev_attribute *attr, | |
517 | const char *buf, size_t size) | |
518 | { | |
519 | struct sysdev_ext_attribute *ea = to_ext_attr(attr); | |
520 | char *end; | |
521 | unsigned long new = simple_strtoul(buf, &end, 0); | |
522 | if (end == buf) | |
523 | return -EINVAL; | |
524 | *(unsigned long *)(ea->var) = new; | |
4e318d7c AK |
525 | /* Always return full write size even if we didn't consume all */ |
526 | return size; | |
9800794a AK |
527 | } |
528 | EXPORT_SYMBOL_GPL(sysdev_store_ulong); | |
529 | ||
530 | ssize_t sysdev_show_ulong(struct sys_device *sysdev, | |
531 | struct sysdev_attribute *attr, | |
532 | char *buf) | |
533 | { | |
534 | struct sysdev_ext_attribute *ea = to_ext_attr(attr); | |
535 | return snprintf(buf, PAGE_SIZE, "%lx\n", *(unsigned long *)(ea->var)); | |
536 | } | |
537 | EXPORT_SYMBOL_GPL(sysdev_show_ulong); | |
538 | ||
539 | ssize_t sysdev_store_int(struct sys_device *sysdev, | |
540 | struct sysdev_attribute *attr, | |
541 | const char *buf, size_t size) | |
542 | { | |
543 | struct sysdev_ext_attribute *ea = to_ext_attr(attr); | |
544 | char *end; | |
545 | long new = simple_strtol(buf, &end, 0); | |
546 | if (end == buf || new > INT_MAX || new < INT_MIN) | |
547 | return -EINVAL; | |
548 | *(int *)(ea->var) = new; | |
4e318d7c AK |
549 | /* Always return full write size even if we didn't consume all */ |
550 | return size; | |
9800794a AK |
551 | } |
552 | EXPORT_SYMBOL_GPL(sysdev_store_int); | |
553 | ||
554 | ssize_t sysdev_show_int(struct sys_device *sysdev, | |
555 | struct sysdev_attribute *attr, | |
556 | char *buf) | |
557 | { | |
558 | struct sysdev_ext_attribute *ea = to_ext_attr(attr); | |
559 | return snprintf(buf, PAGE_SIZE, "%d\n", *(int *)(ea->var)); | |
560 | } | |
561 | EXPORT_SYMBOL_GPL(sysdev_show_int); | |
562 |