[net-next-2.6.git] / drivers / base / sys.c

/*
 * sys.c - pseudo-bus for system 'devices' (cpus, PICs, timers, etc)
 *
 * Copyright (c) 2002-3 Patrick Mochel
 *               2002-3 Open Source Development Lab
 *
 * This file is released under the GPLv2
 *
 * This exports a 'system' bus type.
 * By default, a 'sys' bus gets added to the root of the system. There will
 * always be core system devices. Devices can use sysdev_register() to
 * add themselves as children of the system bus.
 */

#include <linux/config.h>
#include <linux/sysdev.h>
#include <linux/err.h>
#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/init.h>
#include <linux/slab.h>
#include <linux/string.h>
#include <linux/pm.h>
#include <asm/semaphore.h>

extern struct subsystem devices_subsys;

#define to_sysdev(k) container_of(k, struct sys_device, kobj)
#define to_sysdev_attr(a) container_of(a, struct sysdev_attribute, attr)


static ssize_t
sysdev_show(struct kobject * kobj, struct attribute * attr, char * buffer)
{
	struct sys_device * sysdev = to_sysdev(kobj);
	struct sysdev_attribute * sysdev_attr = to_sysdev_attr(attr);

	if (sysdev_attr->show)
		return sysdev_attr->show(sysdev, buffer);
	return -EIO;
}


static ssize_t
sysdev_store(struct kobject * kobj, struct attribute * attr,
	     const char * buffer, size_t count)
{
	struct sys_device * sysdev = to_sysdev(kobj);
	struct sysdev_attribute * sysdev_attr = to_sysdev_attr(attr);

	if (sysdev_attr->store)
		return sysdev_attr->store(sysdev, buffer, count);
	return -EIO;
}

static struct sysfs_ops sysfs_ops = {
	.show	= sysdev_show,
	.store	= sysdev_store,
};

static struct kobj_type ktype_sysdev = {
	.sysfs_ops	= &sysfs_ops,
};


int sysdev_create_file(struct sys_device * s, struct sysdev_attribute * a)
{
	return sysfs_create_file(&s->kobj, &a->attr);
}


void sysdev_remove_file(struct sys_device * s, struct sysdev_attribute * a)
{
	sysfs_remove_file(&s->kobj, &a->attr);
}

EXPORT_SYMBOL_GPL(sysdev_create_file);
EXPORT_SYMBOL_GPL(sysdev_remove_file);

/*
 * declare system_subsys
 */
static decl_subsys(system, &ktype_sysdev, NULL);

int sysdev_class_register(struct sysdev_class * cls)
{
	pr_debug("Registering sysdev class '%s'\n",
		 kobject_name(&cls->kset.kobj));
	INIT_LIST_HEAD(&cls->drivers);
	cls->kset.subsys = &system_subsys;
	kset_set_kset_s(cls, system_subsys);
	return kset_register(&cls->kset);
}

void sysdev_class_unregister(struct sysdev_class * cls)
{
	pr_debug("Unregistering sysdev class '%s'\n",
		 kobject_name(&cls->kset.kobj));
	kset_unregister(&cls->kset);
}

EXPORT_SYMBOL_GPL(sysdev_class_register);
EXPORT_SYMBOL_GPL(sysdev_class_unregister);


static LIST_HEAD(sysdev_drivers);
static DECLARE_MUTEX(sysdev_drivers_lock);

/**
 *	sysdev_driver_register - Register auxillary driver
 * 	@cls:	Device class driver belongs to.
 *	@drv:	Driver.
 *
 *	If @cls is valid, then @drv is inserted into @cls->drivers to be
 *	called on each operation on devices of that class. The refcount
 *	of @cls is incremented.
 *	Otherwise, @drv is inserted into sysdev_drivers, and called for
 *	each device.
 */

int sysdev_driver_register(struct sysdev_class * cls,
			   struct sysdev_driver * drv)
{
	down(&sysdev_drivers_lock);
	if (cls && kset_get(&cls->kset)) {
		list_add_tail(&drv->entry, &cls->drivers);

		/* If devices of this class already exist, tell the driver */
		if (drv->add) {
			struct sys_device *dev;
			list_for_each_entry(dev, &cls->kset.list, kobj.entry)
				drv->add(dev);
		}
	} else
		list_add_tail(&drv->entry, &sysdev_drivers);
	up(&sysdev_drivers_lock);
	return 0;
}


/**
 *	sysdev_driver_unregister - Remove an auxillary driver.
 *	@cls:	Class driver belongs to.
 *	@drv:	Driver.
 */
void sysdev_driver_unregister(struct sysdev_class * cls,
			      struct sysdev_driver * drv)
{
	down(&sysdev_drivers_lock);
	list_del_init(&drv->entry);
	if (cls) {
		if (drv->remove) {
			struct sys_device *dev;
			list_for_each_entry(dev, &cls->kset.list, kobj.entry)
				drv->remove(dev);
		}
		kset_put(&cls->kset);
	}
	up(&sysdev_drivers_lock);
}

EXPORT_SYMBOL_GPL(sysdev_driver_register);
EXPORT_SYMBOL_GPL(sysdev_driver_unregister);


/**
 *	sysdev_register - add a system device to the tree
 *	@sysdev:	device in question
 *
 */
int sysdev_register(struct sys_device * sysdev)
{
	int error;
	struct sysdev_class * cls = sysdev->cls;

	if (!cls)
		return -EINVAL;

	/* Make sure the kset is set */
	sysdev->kobj.kset = &cls->kset;

	/* But make sure we point to the right type for sysfs translation */
	sysdev->kobj.ktype = &ktype_sysdev;
	error = kobject_set_name(&sysdev->kobj, "%s%d",
			 kobject_name(&cls->kset.kobj), sysdev->id);
	if (error)
		return error;

	pr_debug("Registering sys device '%s'\n", kobject_name(&sysdev->kobj));

	/* Register the object */
	error = kobject_register(&sysdev->kobj);

	if (!error) {
		struct sysdev_driver * drv;

		down(&sysdev_drivers_lock);
		/* Generic notification is implicit, because it's that
		 * code that should have called us.
		 */

		/* Notify global drivers */
		list_for_each_entry(drv, &sysdev_drivers, entry) {
			if (drv->add)
				drv->add(sysdev);
		}

		/* Notify class auxillary drivers */
		list_for_each_entry(drv, &cls->drivers, entry) {
			if (drv->add)
				drv->add(sysdev);
		}
		up(&sysdev_drivers_lock);
	}
	return error;
}

void sysdev_unregister(struct sys_device * sysdev)
{
	struct sysdev_driver * drv;

	down(&sysdev_drivers_lock);
	list_for_each_entry(drv, &sysdev_drivers, entry) {
		if (drv->remove)
			drv->remove(sysdev);
	}

	list_for_each_entry(drv, &sysdev->cls->drivers, entry) {
		if (drv->remove)
			drv->remove(sysdev);
	}
	up(&sysdev_drivers_lock);

	kobject_unregister(&sysdev->kobj);
}


/**
 *	sysdev_shutdown - Shut down all system devices.
 *
 *	Loop over each class of system devices, and the devices in each
 *	of those classes. For each device, we call the shutdown method for
 *	each driver registered for the device - the globals, the auxillaries,
 *	and the class driver.
 *
 *	Note: The list is iterated in reverse order, so that we shut down
 *	child devices before we shut down thier parents. The list ordering
 *	is guaranteed by virtue of the fact that child devices are registered
 *	after their parents.
 */

void sysdev_shutdown(void)
{
	struct sysdev_class * cls;

	pr_debug("Shutting Down System Devices\n");

	down(&sysdev_drivers_lock);
	list_for_each_entry_reverse(cls, &system_subsys.kset.list,
				    kset.kobj.entry) {
		struct sys_device * sysdev;

		pr_debug("Shutting down type '%s':\n",
			 kobject_name(&cls->kset.kobj));

		list_for_each_entry(sysdev, &cls->kset.list, kobj.entry) {
			struct sysdev_driver * drv;
			pr_debug(" %s\n", kobject_name(&sysdev->kobj));

			/* Call global drivers first. */
			list_for_each_entry(drv, &sysdev_drivers, entry) {
				if (drv->shutdown)
					drv->shutdown(sysdev);
			}

			/* Call auxillary drivers next. */
			list_for_each_entry(drv, &cls->drivers, entry) {
				if (drv->shutdown)
					drv->shutdown(sysdev);
			}

			/* Now call the generic one */
			if (cls->shutdown)
				cls->shutdown(sysdev);
		}
	}
	up(&sysdev_drivers_lock);
}

static void __sysdev_resume(struct sys_device *dev)
{
	struct sysdev_class *cls = dev->cls;
	struct sysdev_driver *drv;

	/* First, call the class-specific one */
	if (cls->resume)
		cls->resume(dev);

	/* Call auxillary drivers next. */
	list_for_each_entry(drv, &cls->drivers, entry) {
		if (drv->resume)
			drv->resume(dev);
	}

	/* Call global drivers. */
	list_for_each_entry(drv, &sysdev_drivers, entry) {
		if (drv->resume)
			drv->resume(dev);
	}
}

/**
 *	sysdev_suspend - Suspend all system devices.
 *	@state:		Power state to enter.
 *
 *	We perform an almost identical operation as sys_device_shutdown()
 *	above, though calling ->suspend() instead. Interrupts are disabled
 *	when this called. Devices are responsible for both saving state and
 *	quiescing or powering down the device.
 *
 *	This is only called by the device PM core, so we let them handle
 *	all synchronization.
 */

int sysdev_suspend(pm_message_t state)
{
	struct sysdev_class * cls;
	struct sys_device *sysdev, *err_dev;
	struct sysdev_driver *drv, *err_drv;
	int ret;

	pr_debug("Suspending System Devices\n");

	list_for_each_entry_reverse(cls, &system_subsys.kset.list,
				    kset.kobj.entry) {

		pr_debug("Suspending type '%s':\n",
			 kobject_name(&cls->kset.kobj));

		list_for_each_entry(sysdev, &cls->kset.list, kobj.entry) {
			pr_debug(" %s\n", kobject_name(&sysdev->kobj));

			/* Call global drivers first. */
			list_for_each_entry(drv, &sysdev_drivers, entry) {
				if (drv->suspend) {
					ret = drv->suspend(sysdev, state);
					if (ret)
						goto gbl_driver;
				}
			}

			/* Call auxillary drivers next. */
			list_for_each_entry(drv, &cls->drivers, entry) {
				if (drv->suspend) {
					ret = drv->suspend(sysdev, state);
					if (ret)
						goto aux_driver;
				}
			}

			/* Now call the generic one */
			if (cls->suspend) {
				ret = cls->suspend(sysdev, state);
				if (ret)
					goto cls_driver;
			}
		}
	}
	return 0;
	/* resume current sysdev */
cls_driver:
	drv = NULL;
	printk(KERN_ERR "Class suspend failed for %s\n",
		kobject_name(&sysdev->kobj));

aux_driver:
	if (drv)
		printk(KERN_ERR "Class driver suspend failed for %s\n",
				kobject_name(&sysdev->kobj));
	list_for_each_entry(err_drv, &cls->drivers, entry) {
		if (err_drv == drv)
			break;
		if (err_drv->resume)
			err_drv->resume(sysdev);
	}
	drv = NULL;

gbl_driver:
	if (drv)
		printk(KERN_ERR "sysdev driver suspend failed for %s\n",
				kobject_name(&sysdev->kobj));
	list_for_each_entry(err_drv, &sysdev_drivers, entry) {
		if (err_drv == drv)
			break;
		if (err_drv->resume)
			err_drv->resume(sysdev);
	}
	/* resume other sysdevs in current class */
	list_for_each_entry(err_dev, &cls->kset.list, kobj.entry) {
		if (err_dev == sysdev)
			break;
		pr_debug(" %s\n", kobject_name(&err_dev->kobj));
		__sysdev_resume(err_dev);
	}

	/* resume other classes */
	list_for_each_entry_continue(cls, &system_subsys.kset.list,
					kset.kobj.entry) {
		list_for_each_entry(err_dev, &cls->kset.list, kobj.entry) {
			pr_debug(" %s\n", kobject_name(&err_dev->kobj));
			__sysdev_resume(err_dev);
		}
	}
	return ret;
}


/**
 *	sysdev_resume - Bring system devices back to life.
 *
 *	Similar to sys_device_suspend(), but we iterate the list forwards
 *	to guarantee that parent devices are resumed before their children.
 *
 *	Note: Interrupts are disabled when called.
 */

int sysdev_resume(void)
{
	struct sysdev_class * cls;

	pr_debug("Resuming System Devices\n");

	list_for_each_entry(cls, &system_subsys.kset.list, kset.kobj.entry) {
		struct sys_device * sysdev;

		pr_debug("Resuming type '%s':\n",
			 kobject_name(&cls->kset.kobj));

		list_for_each_entry(sysdev, &cls->kset.list, kobj.entry) {
			pr_debug(" %s\n", kobject_name(&sysdev->kobj));

			__sysdev_resume(sysdev);
		}
	}
	return 0;
}


int __init system_bus_init(void)
{
	system_subsys.kset.kobj.parent = &devices_subsys.kset.kobj;
	return subsystem_register(&system_subsys);
}

EXPORT_SYMBOL_GPL(sysdev_register);
EXPORT_SYMBOL_GPL(sysdev_unregister);
Commit	Line	Data
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
	15	#include <linux/config.h>
	16	#include <linux/sysdev.h>
	17	#include <linux/err.h>
	18	#include <linux/module.h>
	19	#include <linux/kernel.h>
	20	#include <linux/init.h>
	21	#include <linux/slab.h>
	22	#include <linux/string.h>
438510f6	23	#include <linux/pm.h>
4e57b681	24	#include <asm/semaphore.h>
1da177e4	25
1da177e4 LT	26	extern struct subsystem devices_subsys;
	27
	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
	33	sysdev_show(struct kobject * kobj, struct attribute * attr, char * buffer)
	34	{
	35	struct sys_device * sysdev = to_sysdev(kobj);
	36	struct sysdev_attribute * sysdev_attr = to_sysdev_attr(attr);
	37
	38	if (sysdev_attr->show)
	39	return sysdev_attr->show(sysdev, buffer);
4a0c20bf	40	return -EIO;
1da177e4 LT	41	}
	42
	43
	44	static ssize_t
	45	sysdev_store(struct kobject * kobj, struct attribute * attr,
	46	const char * buffer, size_t count)
	47	{
	48	struct sys_device * sysdev = to_sysdev(kobj);
	49	struct sysdev_attribute * sysdev_attr = to_sysdev_attr(attr);
	50
	51	if (sysdev_attr->store)
	52	return sysdev_attr->store(sysdev, 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
	66	int sysdev_create_file(struct sys_device * s, struct sysdev_attribute * a)
	67	{
	68	return sysfs_create_file(&s->kobj, &a->attr);
	69	}
	70
	71
	72	void sysdev_remove_file(struct sys_device * s, struct sysdev_attribute * a)
	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
	80	/*
	81	* declare system_subsys
	82	*/
	83	static decl_subsys(system, &ktype_sysdev, NULL);
	84
	85	int sysdev_class_register(struct sysdev_class * cls)
	86	{
	87	pr_debug("Registering sysdev class '%s'\n",
	88	kobject_name(&cls->kset.kobj));
	89	INIT_LIST_HEAD(&cls->drivers);
	90	cls->kset.subsys = &system_subsys;
	91	kset_set_kset_s(cls, system_subsys);
	92	return kset_register(&cls->kset);
	93	}
	94
	95	void sysdev_class_unregister(struct sysdev_class * cls)
	96	{
	97	pr_debug("Unregistering sysdev class '%s'\n",
	98	kobject_name(&cls->kset.kobj));
	99	kset_unregister(&cls->kset);
	100	}
	101
	102	EXPORT_SYMBOL_GPL(sysdev_class_register);
	103	EXPORT_SYMBOL_GPL(sysdev_class_unregister);
	104
	105
	106	static LIST_HEAD(sysdev_drivers);
	107	static DECLARE_MUTEX(sysdev_drivers_lock);
	108
	109	/**
	110	* sysdev_driver_register - Register auxillary driver
	111	* @cls: Device class driver belongs to.
	112	* @drv: Driver.
	113	*
	114	* If @cls is valid, then @drv is inserted into @cls->drivers to be
	115	* called on each operation on devices of that class. The refcount
	116	* of @cls is incremented.
	117	* Otherwise, @drv is inserted into sysdev_drivers, and called for
118	* each device.
119	*/
120
121	int sysdev_driver_register(struct sysdev_class * cls,
122	struct sysdev_driver * drv)
123	{
124	down(&sysdev_drivers_lock);
125	if (cls && kset_get(&cls->kset)) {
126	list_add_tail(&drv->entry, &cls->drivers);
127
128	/* If devices of this class already exist, tell the driver */
129	if (drv->add) {
130	struct sys_device *dev;
131	list_for_each_entry(dev, &cls->kset.list, kobj.entry)
132	drv->add(dev);
133	}
134	} else
135	list_add_tail(&drv->entry, &sysdev_drivers);
136	up(&sysdev_drivers_lock);
137	return 0;
138	}
139
140
141	/**
142	* sysdev_driver_unregister - Remove an auxillary driver.
143	* @cls: Class driver belongs to.
144	* @drv: Driver.
145	*/
146	void sysdev_driver_unregister(struct sysdev_class * cls,
147	struct sysdev_driver * drv)
148	{
149	down(&sysdev_drivers_lock);
150	list_del_init(&drv->entry);
151	if (cls) {
152	if (drv->remove) {
153	struct sys_device *dev;
154	list_for_each_entry(dev, &cls->kset.list, kobj.entry)
155	drv->remove(dev);
156	}
157	kset_put(&cls->kset);
158	}
159	up(&sysdev_drivers_lock);
160	}
161
162	EXPORT_SYMBOL_GPL(sysdev_driver_register);
163	EXPORT_SYMBOL_GPL(sysdev_driver_unregister);
164
165
166
167	/**
168	* sysdev_register - add a system device to the tree
169	* @sysdev: device in question
170	*
171	*/
172	int sysdev_register(struct sys_device * sysdev)
173	{
174	int error;
175	struct sysdev_class * cls = sysdev->cls;
176
177	if (!cls)
178	return -EINVAL;
179
180	/* Make sure the kset is set */
181	sysdev->kobj.kset = &cls->kset;
182
183	/* But make sure we point to the right type for sysfs translation */
184	sysdev->kobj.ktype = &ktype_sysdev;
185	error = kobject_set_name(&sysdev->kobj, "%s%d",
186	kobject_name(&cls->kset.kobj), sysdev->id);
187	if (error)
188	return error;
189
190	pr_debug("Registering sys device '%s'\n", kobject_name(&sysdev->kobj));
191
192	/* Register the object */
193	error = kobject_register(&sysdev->kobj);
194
195	if (!error) {
196	struct sysdev_driver * drv;
197
198	down(&sysdev_drivers_lock);
199	/* Generic notification is implicit, because it's that
200	* code that should have called us.
201	*/
202
203	/* Notify global drivers */
204	list_for_each_entry(drv, &sysdev_drivers, entry) {
205	if (drv->add)
206	drv->add(sysdev);
207	}
208
209	/* Notify class auxillary drivers */
210	list_for_each_entry(drv, &cls->drivers, entry) {
211	if (drv->add)
212	drv->add(sysdev);
213	}
214	up(&sysdev_drivers_lock);
215	}
216	return error;
217	}
218
219	void sysdev_unregister(struct sys_device * sysdev)
220	{
221	struct sysdev_driver * drv;
222
223	down(&sysdev_drivers_lock);
224	list_for_each_entry(drv, &sysdev_drivers, entry) {
225	if (drv->remove)
226	drv->remove(sysdev);
227	}
228
229	list_for_each_entry(drv, &sysdev->cls->drivers, entry) {
230	if (drv->remove)
231	drv->remove(sysdev);
232	}
233	up(&sysdev_drivers_lock);
234
235	kobject_unregister(&sysdev->kobj);
236	}
237
238
239
240	/**
241	* sysdev_shutdown - Shut down all system devices.
242	*
243	* Loop over each class of system devices, and the devices in each
244	* of those classes. For each device, we call the shutdown method for
245	* each driver registered for the device - the globals, the auxillaries,
246	* and the class driver.
247	*
248	* Note: The list is iterated in reverse order, so that we shut down
249	* child devices before we shut down thier parents. The list ordering
250	* is guaranteed by virtue of the fact that child devices are registered
251	* after their parents.
252	*/
253
254	void sysdev_shutdown(void)
255	{
256	struct sysdev_class * cls;
257
258	pr_debug("Shutting Down System Devices\n");
259
260	down(&sysdev_drivers_lock);
261	list_for_each_entry_reverse(cls, &system_subsys.kset.list,
262	kset.kobj.entry) {
263	struct sys_device * sysdev;
264
265	pr_debug("Shutting down type '%s':\n",
266	kobject_name(&cls->kset.kobj));
267
268	list_for_each_entry(sysdev, &cls->kset.list, kobj.entry) {
269	struct sysdev_driver * drv;
270	pr_debug(" %s\n", kobject_name(&sysdev->kobj));
271
272	/* Call global drivers first. */
273	list_for_each_entry(drv, &sysdev_drivers, entry) {
274	if (drv->shutdown)
275	drv->shutdown(sysdev);
276	}
277
278	/* Call auxillary drivers next. */
279	list_for_each_entry(drv, &cls->drivers, entry) {
280	if (drv->shutdown)
281	drv->shutdown(sysdev);
282	}
283
284	/* Now call the generic one */
285	if (cls->shutdown)
286	cls->shutdown(sysdev);
287	}
288	}
289	up(&sysdev_drivers_lock);
290	}
291
ceaeade1 SL	292	static void __sysdev_resume(struct sys_device *dev)
	293	{
	294	struct sysdev_class *cls = dev->cls;
	295	struct sysdev_driver *drv;
	296
	297	/* First, call the class-specific one */
	298	if (cls->resume)
	299	cls->resume(dev);
	300
	301	/* Call auxillary drivers next. */
	302	list_for_each_entry(drv, &cls->drivers, entry) {
	303	if (drv->resume)
	304	drv->resume(dev);
	305	}
	306
	307	/* Call global drivers. */
	308	list_for_each_entry(drv, &sysdev_drivers, entry) {
	309	if (drv->resume)
	310	drv->resume(dev);
	311	}
	312	}
1da177e4 LT	313
	314	/**
	315	* sysdev_suspend - Suspend all system devices.
	316	* @state: Power state to enter.
	317	*
	318	* We perform an almost identical operation as sys_device_shutdown()
	319	* above, though calling ->suspend() instead. Interrupts are disabled
	320	* when this called. Devices are responsible for both saving state and
	321	* quiescing or powering down the device.
	322	*
	323	* This is only called by the device PM core, so we let them handle
	324	* all synchronization.
	325	*/
	326
438510f6	327	int sysdev_suspend(pm_message_t state)
1da177e4 LT	328	{
1da177e4 LT	329	struct sysdev_class * cls;
ceaeade1 SL	330	struct sys_device sysdev, err_dev;
	331	struct sysdev_driver drv, err_drv;
	332	int ret;
1da177e4 LT	333
	334	pr_debug("Suspending System Devices\n");
	335
	336	list_for_each_entry_reverse(cls, &system_subsys.kset.list,
	337	kset.kobj.entry) {
1da177e4 LT	338
	339	pr_debug("Suspending type '%s':\n",
	340	kobject_name(&cls->kset.kobj));
	341
	342	list_for_each_entry(sysdev, &cls->kset.list, kobj.entry) {
1da177e4 LT	343	pr_debug(" %s\n", kobject_name(&sysdev->kobj));
	344
	345	/* Call global drivers first. */
	346	list_for_each_entry(drv, &sysdev_drivers, entry) {
ceaeade1 SL	347	if (drv->suspend) {
	348	ret = drv->suspend(sysdev, state);
	349	if (ret)
	350	goto gbl_driver;
	351	}
1da177e4 LT	352	}
	353
	354	/* Call auxillary drivers next. */
	355	list_for_each_entry(drv, &cls->drivers, entry) {
ceaeade1 SL	356	if (drv->suspend) {
	357	ret = drv->suspend(sysdev, state);
	358	if (ret)
	359	goto aux_driver;
	360	}
1da177e4 LT	361	}
	362
	363	/* Now call the generic one */
ceaeade1 SL	364	if (cls->suspend) {
	365	ret = cls->suspend(sysdev, state);
	366	if (ret)
	367	goto cls_driver;
	368	}
1da177e4 LT	369	}
	370	}
	371	return 0;
ceaeade1 SL	372	/* resume current sysdev */
	373	cls_driver:
	374	drv = NULL;
	375	printk(KERN_ERR "Class suspend failed for %s\n",
	376	kobject_name(&sysdev->kobj));
	377
	378	aux_driver:
	379	if (drv)
	380	printk(KERN_ERR "Class driver suspend failed for %s\n",
	381	kobject_name(&sysdev->kobj));
	382	list_for_each_entry(err_drv, &cls->drivers, entry) {
	383	if (err_drv == drv)
	384	break;
	385	if (err_drv->resume)
	386	err_drv->resume(sysdev);
	387	}
	388	drv = NULL;
	389
	390	gbl_driver:
	391	if (drv)
	392	printk(KERN_ERR "sysdev driver suspend failed for %s\n",
	393	kobject_name(&sysdev->kobj));
	394	list_for_each_entry(err_drv, &sysdev_drivers, entry) {
	395	if (err_drv == drv)
	396	break;
	397	if (err_drv->resume)
	398	err_drv->resume(sysdev);
	399	}
	400	/* resume other sysdevs in current class */
	401	list_for_each_entry(err_dev, &cls->kset.list, kobj.entry) {
	402	if (err_dev == sysdev)
	403	break;
	404	pr_debug(" %s\n", kobject_name(&err_dev->kobj));
	405	__sysdev_resume(err_dev);
	406	}
	407
	408	/* resume other classes */
	409	list_for_each_entry_continue(cls, &system_subsys.kset.list,
	410	kset.kobj.entry) {
	411	list_for_each_entry(err_dev, &cls->kset.list, kobj.entry) {
	412	pr_debug(" %s\n", kobject_name(&err_dev->kobj));
	413	__sysdev_resume(err_dev);
	414	}
	415	}
	416	return ret;
1da177e4 LT	417	}
	418
	419
	420	/**
	421	* sysdev_resume - Bring system devices back to life.
	422	*
	423	* Similar to sys_device_suspend(), but we iterate the list forwards
	424	* to guarantee that parent devices are resumed before their children.
	425	*
	426	* Note: Interrupts are disabled when called.
	427	*/
	428
	429	int sysdev_resume(void)
	430	{
	431	struct sysdev_class * cls;
	432
	433	pr_debug("Resuming System Devices\n");
	434
	435	list_for_each_entry(cls, &system_subsys.kset.list, kset.kobj.entry) {
	436	struct sys_device * sysdev;
	437
	438	pr_debug("Resuming type '%s':\n",
	439	kobject_name(&cls->kset.kobj));
	440
	441	list_for_each_entry(sysdev, &cls->kset.list, kobj.entry) {
1da177e4 LT	442	pr_debug(" %s\n", kobject_name(&sysdev->kobj));
1da177e4 LT	443
ceaeade1	444	__sysdev_resume(sysdev);
1da177e4 LT	445	}
	446	}
	447	return 0;
	448	}
	449
	450
	451	int __init system_bus_init(void)
	452	{
	453	system_subsys.kset.kobj.parent = &devices_subsys.kset.kobj;
	454	return subsystem_register(&system_subsys);
	455	}
	456
	457	EXPORT_SYMBOL_GPL(sysdev_register);
	458	EXPORT_SYMBOL_GPL(sysdev_unregister);