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Linus Torvalds1da177e2005-04-16 15:20:36 -07001/*
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
Linus Torvalds1da177e2005-04-16 15:20:36 -070015#include <linux/sysdev.h>
16#include <linux/err.h>
17#include <linux/module.h>
18#include <linux/kernel.h>
19#include <linux/init.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070020#include <linux/string.h>
Pavel Machek438510f2005-04-16 15:25:24 -070021#include <linux/pm.h>
Adrian Bunkf67d1152006-01-19 17:30:17 +010022#include <linux/device.h>
Matthias Kaehlcke9f3f7762007-05-23 14:19:42 -070023#include <linux/mutex.h>
Rafael J. Wysocki2ed8d2b2009-03-16 22:34:06 +010024#include <linux/interrupt.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070025
Adrian Bunkf67d1152006-01-19 17:30:17 +010026#include "base.h"
27
Linus Torvalds1da177e2005-04-16 15:20:36 -070028#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
32static ssize_t
Zhenwen Xu60530af2009-03-03 18:36:02 +080033sysdev_show(struct kobject *kobj, struct attribute *attr, char *buffer)
Linus Torvalds1da177e2005-04-16 15:20:36 -070034{
Zhenwen Xu60530af2009-03-03 18:36:02 +080035 struct sys_device *sysdev = to_sysdev(kobj);
36 struct sysdev_attribute *sysdev_attr = to_sysdev_attr(attr);
Linus Torvalds1da177e2005-04-16 15:20:36 -070037
38 if (sysdev_attr->show)
Andi Kleen4a0b2b42008-07-01 18:48:41 +020039 return sysdev_attr->show(sysdev, sysdev_attr, buffer);
Dmitry Torokhov4a0c20b2005-04-29 01:23:47 -050040 return -EIO;
Linus Torvalds1da177e2005-04-16 15:20:36 -070041}
42
43
44static ssize_t
Zhenwen Xu60530af2009-03-03 18:36:02 +080045sysdev_store(struct kobject *kobj, struct attribute *attr,
46 const char *buffer, size_t count)
Linus Torvalds1da177e2005-04-16 15:20:36 -070047{
Zhenwen Xu60530af2009-03-03 18:36:02 +080048 struct sys_device *sysdev = to_sysdev(kobj);
49 struct sysdev_attribute *sysdev_attr = to_sysdev_attr(attr);
Linus Torvalds1da177e2005-04-16 15:20:36 -070050
51 if (sysdev_attr->store)
Andi Kleen4a0b2b42008-07-01 18:48:41 +020052 return sysdev_attr->store(sysdev, sysdev_attr, buffer, count);
Dmitry Torokhov4a0c20b2005-04-29 01:23:47 -050053 return -EIO;
Linus Torvalds1da177e2005-04-16 15:20:36 -070054}
55
Emese Revfy52cf25d2010-01-19 02:58:23 +010056static const struct sysfs_ops sysfs_ops = {
Linus Torvalds1da177e2005-04-16 15:20:36 -070057 .show = sysdev_show,
58 .store = sysdev_store,
59};
60
61static struct kobj_type ktype_sysdev = {
62 .sysfs_ops = &sysfs_ops,
63};
64
65
Zhenwen Xu60530af2009-03-03 18:36:02 +080066int sysdev_create_file(struct sys_device *s, struct sysdev_attribute *a)
Linus Torvalds1da177e2005-04-16 15:20:36 -070067{
68 return sysfs_create_file(&s->kobj, &a->attr);
69}
70
71
Zhenwen Xu60530af2009-03-03 18:36:02 +080072void sysdev_remove_file(struct sys_device *s, struct sysdev_attribute *a)
Linus Torvalds1da177e2005-04-16 15:20:36 -070073{
74 sysfs_remove_file(&s->kobj, &a->attr);
75}
76
77EXPORT_SYMBOL_GPL(sysdev_create_file);
78EXPORT_SYMBOL_GPL(sysdev_remove_file);
79
Shaohua Li670dd902006-05-08 13:45:57 +080080#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
84static ssize_t sysdev_class_show(struct kobject *kobj, struct attribute *attr,
85 char *buffer)
86{
Zhenwen Xu60530af2009-03-03 18:36:02 +080087 struct sysdev_class *class = to_sysdev_class(kobj);
Shaohua Li670dd902006-05-08 13:45:57 +080088 struct sysdev_class_attribute *class_attr = to_sysdev_class_attr(attr);
89
90 if (class_attr->show)
Andi Kleenc9be0a32010-01-05 12:47:58 +010091 return class_attr->show(class, class_attr, buffer);
Shaohua Li670dd902006-05-08 13:45:57 +080092 return -EIO;
93}
94
95static ssize_t sysdev_class_store(struct kobject *kobj, struct attribute *attr,
96 const char *buffer, size_t count)
97{
Zhenwen Xu60530af2009-03-03 18:36:02 +080098 struct sysdev_class *class = to_sysdev_class(kobj);
99 struct sysdev_class_attribute *class_attr = to_sysdev_class_attr(attr);
Shaohua Li670dd902006-05-08 13:45:57 +0800100
101 if (class_attr->store)
Andi Kleenc9be0a32010-01-05 12:47:58 +0100102 return class_attr->store(class, class_attr, buffer, count);
Shaohua Li670dd902006-05-08 13:45:57 +0800103 return -EIO;
104}
105
Emese Revfy52cf25d2010-01-19 02:58:23 +0100106static const struct sysfs_ops sysfs_class_ops = {
Shaohua Li670dd902006-05-08 13:45:57 +0800107 .show = sysdev_class_show,
108 .store = sysdev_class_store,
109};
110
111static struct kobj_type ktype_sysdev_class = {
112 .sysfs_ops = &sysfs_class_ops,
113};
114
115int 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}
120EXPORT_SYMBOL_GPL(sysdev_class_create_file);
121
122void 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}
127EXPORT_SYMBOL_GPL(sysdev_class_remove_file);
128
Greg Kroah-Hartmanaade4042007-11-01 09:29:06 -0600129static struct kset *system_kset;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700130
Zhenwen Xu60530af2009-03-03 18:36:02 +0800131int sysdev_class_register(struct sysdev_class *cls)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700132{
Dave Young9227c472009-05-11 14:18:55 +0800133 int retval;
134
Ben Dooks838ea8e2008-06-12 19:00:34 +0100135 pr_debug("Registering sysdev class '%s'\n", cls->name);
136
Linus Torvalds1da177e2005-04-16 15:20:36 -0700137 INIT_LIST_HEAD(&cls->drivers);
Greg Kroah-Hartmanef79df22008-03-09 03:37:16 +0530138 memset(&cls->kset.kobj, 0x00, sizeof(struct kobject));
Greg Kroah-Hartmanaade4042007-11-01 09:29:06 -0600139 cls->kset.kobj.parent = &system_kset->kobj;
Greg Kroah-Hartman3514fac2007-10-16 10:11:44 -0600140 cls->kset.kobj.ktype = &ktype_sysdev_class;
Greg Kroah-Hartmanaade4042007-11-01 09:29:06 -0600141 cls->kset.kobj.kset = system_kset;
Dave Young9227c472009-05-11 14:18:55 +0800142
Greg Kroah-Hartmanacc0e902009-06-02 15:39:55 -0700143 retval = kobject_set_name(&cls->kset.kobj, "%s", cls->name);
Dave Young9227c472009-05-11 14:18:55 +0800144 if (retval)
145 return retval;
146
Andi Kleen38457ab2010-01-05 12:48:02 +0100147 retval = kset_register(&cls->kset);
148 if (!retval && cls->attrs)
149 retval = sysfs_create_files(&cls->kset.kobj,
150 (const struct attribute **)cls->attrs);
151 return retval;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700152}
153
Zhenwen Xu60530af2009-03-03 18:36:02 +0800154void sysdev_class_unregister(struct sysdev_class *cls)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700155{
156 pr_debug("Unregistering sysdev class '%s'\n",
157 kobject_name(&cls->kset.kobj));
Andi Kleen38457ab2010-01-05 12:48:02 +0100158 if (cls->attrs)
159 sysfs_remove_files(&cls->kset.kobj,
160 (const struct attribute **)cls->attrs);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700161 kset_unregister(&cls->kset);
162}
163
164EXPORT_SYMBOL_GPL(sysdev_class_register);
165EXPORT_SYMBOL_GPL(sysdev_class_unregister);
166
Matthias Kaehlcke9f3f7762007-05-23 14:19:42 -0700167static DEFINE_MUTEX(sysdev_drivers_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700168
169/**
170 * sysdev_driver_register - Register auxillary driver
Akinobu Mita44b760a2007-08-19 16:51:14 +0900171 * @cls: Device class driver belongs to.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700172 * @drv: Driver.
173 *
Akinobu Mita44b760a2007-08-19 16:51:14 +0900174 * @drv is inserted into @cls->drivers to be
Linus Torvalds1da177e2005-04-16 15:20:36 -0700175 * called on each operation on devices of that class. The refcount
176 * of @cls is incremented.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700177 */
178
Akinobu Mita44b760a2007-08-19 16:51:14 +0900179int sysdev_driver_register(struct sysdev_class *cls, struct sysdev_driver *drv)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700180{
Akinobu Mita44b760a2007-08-19 16:51:14 +0900181 int err = 0;
182
Ben Dooksda009f32008-03-04 15:09:06 -0800183 if (!cls) {
Arjan van de Venf810a5c2008-07-25 19:45:39 -0700184 WARN(1, KERN_WARNING "sysdev: invalid class passed to "
Ben Dooksda009f32008-03-04 15:09:06 -0800185 "sysdev_driver_register!\n");
Ben Dooksda009f32008-03-04 15:09:06 -0800186 return -EINVAL;
187 }
188
189 /* Check whether this driver has already been added to a class. */
Arjan van de Venf810a5c2008-07-25 19:45:39 -0700190 if (drv->entry.next && !list_empty(&drv->entry))
191 WARN(1, KERN_WARNING "sysdev: class %s: driver (%p) has already"
Ben Dooksda009f32008-03-04 15:09:06 -0800192 " been registered to a class, something is wrong, but "
193 "will forge on!\n", cls->name, drv);
Ben Dooksda009f32008-03-04 15:09:06 -0800194
Matthias Kaehlcke9f3f7762007-05-23 14:19:42 -0700195 mutex_lock(&sysdev_drivers_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700196 if (cls && kset_get(&cls->kset)) {
197 list_add_tail(&drv->entry, &cls->drivers);
198
199 /* If devices of this class already exist, tell the driver */
200 if (drv->add) {
201 struct sys_device *dev;
202 list_for_each_entry(dev, &cls->kset.list, kobj.entry)
203 drv->add(dev);
204 }
Akinobu Mita44b760a2007-08-19 16:51:14 +0900205 } else {
206 err = -EINVAL;
Arjan van de Venf810a5c2008-07-25 19:45:39 -0700207 WARN(1, KERN_ERR "%s: invalid device class\n", __func__);
Akinobu Mita44b760a2007-08-19 16:51:14 +0900208 }
Matthias Kaehlcke9f3f7762007-05-23 14:19:42 -0700209 mutex_unlock(&sysdev_drivers_lock);
Akinobu Mita44b760a2007-08-19 16:51:14 +0900210 return err;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700211}
212
213
214/**
215 * sysdev_driver_unregister - Remove an auxillary driver.
216 * @cls: Class driver belongs to.
217 * @drv: Driver.
218 */
Zhenwen Xu60530af2009-03-03 18:36:02 +0800219void sysdev_driver_unregister(struct sysdev_class *cls,
220 struct sysdev_driver *drv)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700221{
Matthias Kaehlcke9f3f7762007-05-23 14:19:42 -0700222 mutex_lock(&sysdev_drivers_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700223 list_del_init(&drv->entry);
224 if (cls) {
225 if (drv->remove) {
226 struct sys_device *dev;
227 list_for_each_entry(dev, &cls->kset.list, kobj.entry)
228 drv->remove(dev);
229 }
230 kset_put(&cls->kset);
231 }
Matthias Kaehlcke9f3f7762007-05-23 14:19:42 -0700232 mutex_unlock(&sysdev_drivers_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700233}
234
235EXPORT_SYMBOL_GPL(sysdev_driver_register);
236EXPORT_SYMBOL_GPL(sysdev_driver_unregister);
237
238
239
240/**
241 * sysdev_register - add a system device to the tree
242 * @sysdev: device in question
243 *
244 */
Zhenwen Xu60530af2009-03-03 18:36:02 +0800245int sysdev_register(struct sys_device *sysdev)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700246{
247 int error;
Zhenwen Xu60530af2009-03-03 18:36:02 +0800248 struct sysdev_class *cls = sysdev->cls;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700249
250 if (!cls)
251 return -EINVAL;
252
Ben Dooks838ea8e2008-06-12 19:00:34 +0100253 pr_debug("Registering sys device of class '%s'\n",
254 kobject_name(&cls->kset.kobj));
Greg Kroah-Hartman61030bf2007-12-17 15:54:39 -0400255
Greg Kroah-Hartmanef79df22008-03-09 03:37:16 +0530256 /* initialize the kobject to 0, in case it had previously been used */
257 memset(&sysdev->kobj, 0x00, sizeof(struct kobject));
258
Linus Torvalds1da177e2005-04-16 15:20:36 -0700259 /* Make sure the kset is set */
260 sysdev->kobj.kset = &cls->kset;
261
Linus Torvalds1da177e2005-04-16 15:20:36 -0700262 /* Register the object */
Greg Kroah-Hartman61030bf2007-12-17 15:54:39 -0400263 error = kobject_init_and_add(&sysdev->kobj, &ktype_sysdev, NULL,
264 "%s%d", kobject_name(&cls->kset.kobj),
265 sysdev->id);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700266
267 if (!error) {
Zhenwen Xu60530af2009-03-03 18:36:02 +0800268 struct sysdev_driver *drv;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700269
Ben Dooks838ea8e2008-06-12 19:00:34 +0100270 pr_debug("Registering sys device '%s'\n",
271 kobject_name(&sysdev->kobj));
272
Matthias Kaehlcke9f3f7762007-05-23 14:19:42 -0700273 mutex_lock(&sysdev_drivers_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700274 /* Generic notification is implicit, because it's that
275 * code that should have called us.
276 */
277
Linus Torvalds1da177e2005-04-16 15:20:36 -0700278 /* Notify class auxillary drivers */
279 list_for_each_entry(drv, &cls->drivers, entry) {
280 if (drv->add)
281 drv->add(sysdev);
282 }
Matthias Kaehlcke9f3f7762007-05-23 14:19:42 -0700283 mutex_unlock(&sysdev_drivers_lock);
Xiaotian Feng79f03132009-07-24 17:31:41 +0800284 kobject_uevent(&sysdev->kobj, KOBJ_ADD);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700285 }
Ben Dooks838ea8e2008-06-12 19:00:34 +0100286
Linus Torvalds1da177e2005-04-16 15:20:36 -0700287 return error;
288}
289
Zhenwen Xu60530af2009-03-03 18:36:02 +0800290void sysdev_unregister(struct sys_device *sysdev)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700291{
Zhenwen Xu60530af2009-03-03 18:36:02 +0800292 struct sysdev_driver *drv;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700293
Matthias Kaehlcke9f3f7762007-05-23 14:19:42 -0700294 mutex_lock(&sysdev_drivers_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700295 list_for_each_entry(drv, &sysdev->cls->drivers, entry) {
296 if (drv->remove)
297 drv->remove(sysdev);
298 }
Matthias Kaehlcke9f3f7762007-05-23 14:19:42 -0700299 mutex_unlock(&sysdev_drivers_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700300
Greg Kroah-Hartmanc10997f2007-12-20 08:13:05 -0800301 kobject_put(&sysdev->kobj);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700302}
303
304
305
306/**
307 * sysdev_shutdown - Shut down all system devices.
308 *
309 * Loop over each class of system devices, and the devices in each
310 * of those classes. For each device, we call the shutdown method for
Akinobu Mita44b760a2007-08-19 16:51:14 +0900311 * each driver registered for the device - the auxillaries,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700312 * and the class driver.
313 *
314 * Note: The list is iterated in reverse order, so that we shut down
Uwe Kleine-Koenigee6921f2009-01-12 23:35:46 +0100315 * child devices before we shut down their parents. The list ordering
Linus Torvalds1da177e2005-04-16 15:20:36 -0700316 * is guaranteed by virtue of the fact that child devices are registered
317 * after their parents.
318 */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700319void sysdev_shutdown(void)
320{
Zhenwen Xu60530af2009-03-03 18:36:02 +0800321 struct sysdev_class *cls;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700322
323 pr_debug("Shutting Down System Devices\n");
324
Matthias Kaehlcke9f3f7762007-05-23 14:19:42 -0700325 mutex_lock(&sysdev_drivers_lock);
Greg Kroah-Hartmanaade4042007-11-01 09:29:06 -0600326 list_for_each_entry_reverse(cls, &system_kset->list, kset.kobj.entry) {
Zhenwen Xu60530af2009-03-03 18:36:02 +0800327 struct sys_device *sysdev;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700328
329 pr_debug("Shutting down type '%s':\n",
330 kobject_name(&cls->kset.kobj));
331
332 list_for_each_entry(sysdev, &cls->kset.list, kobj.entry) {
Zhenwen Xu60530af2009-03-03 18:36:02 +0800333 struct sysdev_driver *drv;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700334 pr_debug(" %s\n", kobject_name(&sysdev->kobj));
335
Akinobu Mita44b760a2007-08-19 16:51:14 +0900336 /* Call auxillary drivers first */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700337 list_for_each_entry(drv, &cls->drivers, entry) {
338 if (drv->shutdown)
339 drv->shutdown(sysdev);
340 }
341
342 /* Now call the generic one */
343 if (cls->shutdown)
344 cls->shutdown(sysdev);
345 }
346 }
Matthias Kaehlcke9f3f7762007-05-23 14:19:42 -0700347 mutex_unlock(&sysdev_drivers_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700348}
349
Shaohua Liceaeade2005-08-11 10:37:39 +0800350static void __sysdev_resume(struct sys_device *dev)
351{
352 struct sysdev_class *cls = dev->cls;
353 struct sysdev_driver *drv;
354
355 /* First, call the class-specific one */
356 if (cls->resume)
357 cls->resume(dev);
Rafael J. Wysocki62b01242009-04-18 13:45:13 +0200358 WARN_ONCE(!irqs_disabled(),
359 "Interrupts enabled after %pF\n", cls->resume);
Shaohua Liceaeade2005-08-11 10:37:39 +0800360
361 /* Call auxillary drivers next. */
362 list_for_each_entry(drv, &cls->drivers, entry) {
363 if (drv->resume)
364 drv->resume(dev);
Rafael J. Wysocki62b01242009-04-18 13:45:13 +0200365 WARN_ONCE(!irqs_disabled(),
366 "Interrupts enabled after %pF\n", drv->resume);
Shaohua Liceaeade2005-08-11 10:37:39 +0800367 }
Shaohua Liceaeade2005-08-11 10:37:39 +0800368}
Linus Torvalds1da177e2005-04-16 15:20:36 -0700369
370/**
371 * sysdev_suspend - Suspend all system devices.
372 * @state: Power state to enter.
373 *
Qinghuang Feng65151362008-10-13 18:05:04 +0800374 * We perform an almost identical operation as sysdev_shutdown()
Linus Torvalds1da177e2005-04-16 15:20:36 -0700375 * above, though calling ->suspend() instead. Interrupts are disabled
376 * when this called. Devices are responsible for both saving state and
377 * quiescing or powering down the device.
378 *
379 * This is only called by the device PM core, so we let them handle
380 * all synchronization.
381 */
Pavel Machek438510f2005-04-16 15:25:24 -0700382int sysdev_suspend(pm_message_t state)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700383{
Zhenwen Xu60530af2009-03-03 18:36:02 +0800384 struct sysdev_class *cls;
Shaohua Liceaeade2005-08-11 10:37:39 +0800385 struct sys_device *sysdev, *err_dev;
386 struct sysdev_driver *drv, *err_drv;
387 int ret;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700388
Rafael J. Wysocki2ed8d2b2009-03-16 22:34:06 +0100389 pr_debug("Checking wake-up interrupts\n");
390
391 /* Return error code if there are any wake-up interrupts pending */
392 ret = check_wakeup_irqs();
393 if (ret)
394 return ret;
395
Rafael J. Wysocki62b01242009-04-18 13:45:13 +0200396 WARN_ONCE(!irqs_disabled(),
397 "Interrupts enabled while suspending system devices\n");
398
Linus Torvalds1da177e2005-04-16 15:20:36 -0700399 pr_debug("Suspending System Devices\n");
400
Greg Kroah-Hartmanaade4042007-11-01 09:29:06 -0600401 list_for_each_entry_reverse(cls, &system_kset->list, kset.kobj.entry) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700402 pr_debug("Suspending type '%s':\n",
403 kobject_name(&cls->kset.kobj));
404
405 list_for_each_entry(sysdev, &cls->kset.list, kobj.entry) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700406 pr_debug(" %s\n", kobject_name(&sysdev->kobj));
407
Akinobu Mita44b760a2007-08-19 16:51:14 +0900408 /* Call auxillary drivers first */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700409 list_for_each_entry(drv, &cls->drivers, entry) {
Shaohua Liceaeade2005-08-11 10:37:39 +0800410 if (drv->suspend) {
411 ret = drv->suspend(sysdev, state);
412 if (ret)
413 goto aux_driver;
414 }
Rafael J. Wysocki62b01242009-04-18 13:45:13 +0200415 WARN_ONCE(!irqs_disabled(),
416 "Interrupts enabled after %pF\n",
417 drv->suspend);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700418 }
419
420 /* Now call the generic one */
Shaohua Liceaeade2005-08-11 10:37:39 +0800421 if (cls->suspend) {
422 ret = cls->suspend(sysdev, state);
423 if (ret)
424 goto cls_driver;
Rafael J. Wysocki62b01242009-04-18 13:45:13 +0200425 WARN_ONCE(!irqs_disabled(),
426 "Interrupts enabled after %pF\n",
427 cls->suspend);
Shaohua Liceaeade2005-08-11 10:37:39 +0800428 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700429 }
430 }
431 return 0;
Shaohua Liceaeade2005-08-11 10:37:39 +0800432 /* resume current sysdev */
433cls_driver:
434 drv = NULL;
435 printk(KERN_ERR "Class suspend failed for %s\n",
436 kobject_name(&sysdev->kobj));
437
438aux_driver:
439 if (drv)
440 printk(KERN_ERR "Class driver suspend failed for %s\n",
441 kobject_name(&sysdev->kobj));
442 list_for_each_entry(err_drv, &cls->drivers, entry) {
443 if (err_drv == drv)
444 break;
445 if (err_drv->resume)
446 err_drv->resume(sysdev);
447 }
Shaohua Liceaeade2005-08-11 10:37:39 +0800448
Shaohua Liceaeade2005-08-11 10:37:39 +0800449 /* resume other sysdevs in current class */
450 list_for_each_entry(err_dev, &cls->kset.list, kobj.entry) {
451 if (err_dev == sysdev)
452 break;
453 pr_debug(" %s\n", kobject_name(&err_dev->kobj));
454 __sysdev_resume(err_dev);
455 }
456
457 /* resume other classes */
Greg Kroah-Hartmanaade4042007-11-01 09:29:06 -0600458 list_for_each_entry_continue(cls, &system_kset->list, kset.kobj.entry) {
Shaohua Liceaeade2005-08-11 10:37:39 +0800459 list_for_each_entry(err_dev, &cls->kset.list, kobj.entry) {
460 pr_debug(" %s\n", kobject_name(&err_dev->kobj));
461 __sysdev_resume(err_dev);
462 }
463 }
464 return ret;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700465}
Ingo Molnar0f99fed2009-02-22 22:07:03 +0100466EXPORT_SYMBOL_GPL(sysdev_suspend);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700467
468/**
469 * sysdev_resume - Bring system devices back to life.
470 *
Qinghuang Feng65151362008-10-13 18:05:04 +0800471 * Similar to sysdev_suspend(), but we iterate the list forwards
Linus Torvalds1da177e2005-04-16 15:20:36 -0700472 * to guarantee that parent devices are resumed before their children.
473 *
474 * Note: Interrupts are disabled when called.
475 */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700476int sysdev_resume(void)
477{
Zhenwen Xu60530af2009-03-03 18:36:02 +0800478 struct sysdev_class *cls;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700479
Rafael J. Wysocki62b01242009-04-18 13:45:13 +0200480 WARN_ONCE(!irqs_disabled(),
481 "Interrupts enabled while resuming system devices\n");
482
Linus Torvalds1da177e2005-04-16 15:20:36 -0700483 pr_debug("Resuming System Devices\n");
484
Greg Kroah-Hartmanaade4042007-11-01 09:29:06 -0600485 list_for_each_entry(cls, &system_kset->list, kset.kobj.entry) {
Zhenwen Xu60530af2009-03-03 18:36:02 +0800486 struct sys_device *sysdev;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700487
488 pr_debug("Resuming type '%s':\n",
489 kobject_name(&cls->kset.kobj));
490
491 list_for_each_entry(sysdev, &cls->kset.list, kobj.entry) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700492 pr_debug(" %s\n", kobject_name(&sysdev->kobj));
493
Shaohua Liceaeade2005-08-11 10:37:39 +0800494 __sysdev_resume(sysdev);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700495 }
496 }
497 return 0;
498}
Ingo Molnar0f99fed2009-02-22 22:07:03 +0100499EXPORT_SYMBOL_GPL(sysdev_resume);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700500
501int __init system_bus_init(void)
502{
Greg Kroah-Hartmanaade4042007-11-01 09:29:06 -0600503 system_kset = kset_create_and_add("system", NULL, &devices_kset->kobj);
504 if (!system_kset)
505 return -ENOMEM;
506 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700507}
508
509EXPORT_SYMBOL_GPL(sysdev_register);
510EXPORT_SYMBOL_GPL(sysdev_unregister);
Andi Kleen98007942008-07-01 18:48:42 +0200511
512#define to_ext_attr(x) container_of(x, struct sysdev_ext_attribute, attr)
513
514ssize_t sysdev_store_ulong(struct sys_device *sysdev,
515 struct sysdev_attribute *attr,
516 const char *buf, size_t size)
517{
518 struct sysdev_ext_attribute *ea = to_ext_attr(attr);
519 char *end;
520 unsigned long new = simple_strtoul(buf, &end, 0);
521 if (end == buf)
522 return -EINVAL;
523 *(unsigned long *)(ea->var) = new;
Andi Kleen4e318d72008-10-13 12:03:03 +0200524 /* Always return full write size even if we didn't consume all */
525 return size;
Andi Kleen98007942008-07-01 18:48:42 +0200526}
527EXPORT_SYMBOL_GPL(sysdev_store_ulong);
528
529ssize_t sysdev_show_ulong(struct sys_device *sysdev,
530 struct sysdev_attribute *attr,
531 char *buf)
532{
533 struct sysdev_ext_attribute *ea = to_ext_attr(attr);
534 return snprintf(buf, PAGE_SIZE, "%lx\n", *(unsigned long *)(ea->var));
535}
536EXPORT_SYMBOL_GPL(sysdev_show_ulong);
537
538ssize_t sysdev_store_int(struct sys_device *sysdev,
539 struct sysdev_attribute *attr,
540 const char *buf, size_t size)
541{
542 struct sysdev_ext_attribute *ea = to_ext_attr(attr);
543 char *end;
544 long new = simple_strtol(buf, &end, 0);
545 if (end == buf || new > INT_MAX || new < INT_MIN)
546 return -EINVAL;
547 *(int *)(ea->var) = new;
Andi Kleen4e318d72008-10-13 12:03:03 +0200548 /* Always return full write size even if we didn't consume all */
549 return size;
Andi Kleen98007942008-07-01 18:48:42 +0200550}
551EXPORT_SYMBOL_GPL(sysdev_store_int);
552
553ssize_t sysdev_show_int(struct sys_device *sysdev,
554 struct sysdev_attribute *attr,
555 char *buf)
556{
557 struct sysdev_ext_attribute *ea = to_ext_attr(attr);
558 return snprintf(buf, PAGE_SIZE, "%d\n", *(int *)(ea->var));
559}
560EXPORT_SYMBOL_GPL(sysdev_show_int);
561