[deliverable/linux.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/sysdev.h>
#include <linux/err.h>
#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/init.h>
#include <linux/string.h>
#include <linux/pm.h>
#include <linux/device.h>
#include <linux/mutex.h>
#include <linux/interrupt.h>

#include "base.h"

#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, sysdev_attr, 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, sysdev_attr, buffer, count);
	return -EIO;
}

static const 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);

#define to_sysdev_class(k) container_of(k, struct sysdev_class, kset.kobj)
#define to_sysdev_class_attr(a) container_of(a, \
	struct sysdev_class_attribute, attr)

static ssize_t sysdev_class_show(struct kobject *kobj, struct attribute *attr,
				 char *buffer)
{
	struct sysdev_class *class = to_sysdev_class(kobj);
	struct sysdev_class_attribute *class_attr = to_sysdev_class_attr(attr);

	if (class_attr->show)
		return class_attr->show(class, class_attr, buffer);
	return -EIO;
}

static ssize_t sysdev_class_store(struct kobject *kobj, struct attribute *attr,
				  const char *buffer, size_t count)
{
	struct sysdev_class *class = to_sysdev_class(kobj);
	struct sysdev_class_attribute *class_attr = to_sysdev_class_attr(attr);

	if (class_attr->store)
		return class_attr->store(class, class_attr, buffer, count);
	return -EIO;
}

static const struct sysfs_ops sysfs_class_ops = {
	.show	= sysdev_class_show,
	.store	= sysdev_class_store,
};

static struct kobj_type ktype_sysdev_class = {
	.sysfs_ops	= &sysfs_class_ops,
};

int sysdev_class_create_file(struct sysdev_class *c,
			     struct sysdev_class_attribute *a)
{
	return sysfs_create_file(&c->kset.kobj, &a->attr);
}
EXPORT_SYMBOL_GPL(sysdev_class_create_file);

void sysdev_class_remove_file(struct sysdev_class *c,
			      struct sysdev_class_attribute *a)
{
	sysfs_remove_file(&c->kset.kobj, &a->attr);
}
EXPORT_SYMBOL_GPL(sysdev_class_remove_file);

static struct kset *system_kset;

int sysdev_class_register(struct sysdev_class *cls)
{
	int retval;

	pr_debug("Registering sysdev class '%s'\n", cls->name);

	INIT_LIST_HEAD(&cls->drivers);
	memset(&cls->kset.kobj, 0x00, sizeof(struct kobject));
	cls->kset.kobj.parent = &system_kset->kobj;
	cls->kset.kobj.ktype = &ktype_sysdev_class;
	cls->kset.kobj.kset = system_kset;

	retval = kobject_set_name(&cls->kset.kobj, "%s", cls->name);
	if (retval)
		return retval;

	retval = kset_register(&cls->kset);
	if (!retval && cls->attrs)
		retval = sysfs_create_files(&cls->kset.kobj,
					    (const struct attribute **)cls->attrs);
	return retval;
}

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

EXPORT_SYMBOL_GPL(sysdev_class_register);
EXPORT_SYMBOL_GPL(sysdev_class_unregister);

static DEFINE_MUTEX(sysdev_drivers_lock);

/*
 * @dev != NULL means that we're unwinding because some drv->add()
 * failed for some reason. You need to grab sysdev_drivers_lock before
 * calling this.
 */
static void __sysdev_driver_remove(struct sysdev_class *cls,
				   struct sysdev_driver *drv,
				   struct sys_device *from_dev)
{
	struct sys_device *dev = from_dev;

	list_del_init(&drv->entry);
	if (!cls)
		return;

	if (!drv->remove)
		goto kset_put;

	if (dev)
		list_for_each_entry_continue_reverse(dev, &cls->kset.list,
						     kobj.entry)
			drv->remove(dev);
	else
		list_for_each_entry(dev, &cls->kset.list, kobj.entry)
			drv->remove(dev);

kset_put:
	kset_put(&cls->kset);
}

/**
 *	sysdev_driver_register - Register auxiliary driver
 *	@cls:	Device class driver belongs to.
 *	@drv:	Driver.
 *
 *	@drv is inserted into @cls->drivers to be
 *	called on each operation on devices of that class. The refcount
 *	of @cls is incremented.
 */
int sysdev_driver_register(struct sysdev_class *cls, struct sysdev_driver *drv)
{
	struct sys_device *dev = NULL;
	int err = 0;

	if (!cls) {
		WARN(1, KERN_WARNING "sysdev: invalid class passed to %s!\n",
			__func__);
		return -EINVAL;
	}

	/* Check whether this driver has already been added to a class. */
	if (drv->entry.next && !list_empty(&drv->entry))
		WARN(1, KERN_WARNING "sysdev: class %s: driver (%p) has already"
			" been registered to a class, something is wrong, but "
			"will forge on!\n", cls->name, drv);

	mutex_lock(&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) {
			list_for_each_entry(dev, &cls->kset.list, kobj.entry) {
				err = drv->add(dev);
				if (err)
					goto unwind;
			}
		}
	} else {
		err = -EINVAL;
		WARN(1, KERN_ERR "%s: invalid device class\n", __func__);
	}

	goto unlock;

unwind:
	__sysdev_driver_remove(cls, drv, dev);

unlock:
	mutex_unlock(&sysdev_drivers_lock);
	return err;
}

/**
 *	sysdev_driver_unregister - Remove an auxiliary driver.
 *	@cls:	Class driver belongs to.
 *	@drv:	Driver.
 */
void sysdev_driver_unregister(struct sysdev_class *cls,
			      struct sysdev_driver *drv)
{
	mutex_lock(&sysdev_drivers_lock);
	__sysdev_driver_remove(cls, drv, NULL);
	mutex_unlock(&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;

	pr_debug("Registering sys device of class '%s'\n",
		 kobject_name(&cls->kset.kobj));

	/* initialize the kobject to 0, in case it had previously been used */
	memset(&sysdev->kobj, 0x00, sizeof(struct kobject));

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

	/* Register the object */
	error = kobject_init_and_add(&sysdev->kobj, &ktype_sysdev, NULL,
				     "%s%d", kobject_name(&cls->kset.kobj),
				     sysdev->id);

	if (!error) {
		struct sysdev_driver *drv;

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

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

		/* Notify class auxiliary drivers */
		list_for_each_entry(drv, &cls->drivers, entry) {
			if (drv->add)
				drv->add(sysdev);
		}
		mutex_unlock(&sysdev_drivers_lock);
		kobject_uevent(&sysdev->kobj, KOBJ_ADD);
	}

	return error;
}

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

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

	kobject_put(&sysdev->kobj);
}

EXPORT_SYMBOL_GPL(sysdev_register);
EXPORT_SYMBOL_GPL(sysdev_unregister);

int __init system_bus_init(void)
{
	system_kset = kset_create_and_add("system", NULL, &devices_kset->kobj);
	if (!system_kset)
		return -ENOMEM;
	return 0;
}

#define to_ext_attr(x) container_of(x, struct sysdev_ext_attribute, attr)

ssize_t sysdev_store_ulong(struct sys_device *sysdev,
			   struct sysdev_attribute *attr,
			   const char *buf, size_t size)
{
	struct sysdev_ext_attribute *ea = to_ext_attr(attr);
	char *end;
	unsigned long new = simple_strtoul(buf, &end, 0);
	if (end == buf)
		return -EINVAL;
	*(unsigned long *)(ea->var) = new;
	/* Always return full write size even if we didn't consume all */
	return size;
}
EXPORT_SYMBOL_GPL(sysdev_store_ulong);

ssize_t sysdev_show_ulong(struct sys_device *sysdev,
			  struct sysdev_attribute *attr,
			  char *buf)
{
	struct sysdev_ext_attribute *ea = to_ext_attr(attr);
	return snprintf(buf, PAGE_SIZE, "%lx\n", *(unsigned long *)(ea->var));
}
EXPORT_SYMBOL_GPL(sysdev_show_ulong);

ssize_t sysdev_store_int(struct sys_device *sysdev,
			   struct sysdev_attribute *attr,
			   const char *buf, size_t size)
{
	struct sysdev_ext_attribute *ea = to_ext_attr(attr);
	char *end;
	long new = simple_strtol(buf, &end, 0);
	if (end == buf || new > INT_MAX || new < INT_MIN)
		return -EINVAL;
	*(int *)(ea->var) = new;
	/* Always return full write size even if we didn't consume all */
	return size;
}
EXPORT_SYMBOL_GPL(sysdev_store_int);

ssize_t sysdev_show_int(struct sys_device *sysdev,
			  struct sysdev_attribute *attr,
			  char *buf)
{
	struct sysdev_ext_attribute *ea = to_ext_attr(attr);
	return snprintf(buf, PAGE_SIZE, "%d\n", *(int *)(ea->var));
}
EXPORT_SYMBOL_GPL(sysdev_show_int);
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
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>
1da177e4	20	#include <linux/string.h>
438510f6	21	#include <linux/pm.h>
f67d115f	22	#include <linux/device.h>
9f3f776b	23	#include <linux/mutex.h>
2ed8d2b3	24	#include <linux/interrupt.h>
1da177e4	25
f67d115f AB	26	#include "base.h"
f67d115f AB	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);
60530afe ZX	36	struct sysdev_attribute *sysdev_attr = to_sysdev_attr(attr);
1da177e4 LT	37
1da177e4 LT	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,
60530afe ZX	46	const char *buffer, size_t count)
1da177e4	47	{
60530afe ZX	48	struct sys_device *sysdev = to_sysdev(kobj);
60530afe ZX	49	struct sysdev_attribute *sysdev_attr = to_sysdev_attr(attr);
1da177e4 LT	50
1da177e4 LT	51	if (sysdev_attr->store)
4a0b2b4d	52	return sysdev_attr->store(sysdev, sysdev_attr, buffer, count);
4a0c20bf	53	return -EIO;
1da177e4 LT	54	}
1da177e4 LT	55
52cf25d0	56	static const struct sysfs_ops sysfs_ops = {
1da177e4 LT	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)
c9be0a36	91	return class_attr->show(class, class_attr, buffer);
670dd90d SL	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);
60530afe ZX	99	struct sysdev_class_attribute *class_attr = to_sysdev_class_attr(attr);
670dd90d SL	100
670dd90d SL	101	if (class_attr->store)
c9be0a36	102	return class_attr->store(class, class_attr, buffer, count);
670dd90d SL	103	return -EIO;
	104	}
	105
52cf25d0	106	static const struct sysfs_ops sysfs_class_ops = {
670dd90d SL	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	{
9227c47b DY	133	int retval;
9227c47b DY	134
838ea8e8 BD	135	pr_debug("Registering sysdev class '%s'\n", cls->name);
838ea8e8 BD	136
1da177e4	137	INIT_LIST_HEAD(&cls->drivers);
ef79df26	138	memset(&cls->kset.kobj, 0x00, sizeof(struct kobject));
aade4041	139	cls->kset.kobj.parent = &system_kset->kobj;
3514faca	140	cls->kset.kobj.ktype = &ktype_sysdev_class;
aade4041	141	cls->kset.kobj.kset = system_kset;
9227c47b	142
acc0e90f	143	retval = kobject_set_name(&cls->kset.kobj, "%s", cls->name);
9227c47b DY	144	if (retval)
	145	return retval;
	146
38457ab3 AK	147	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;
1da177e4 LT	152	}
1da177e4 LT	153
60530afe	154	void sysdev_class_unregister(struct sysdev_class *cls)
1da177e4 LT	155	{
	156	pr_debug("Unregistering sysdev class '%s'\n",
	157	kobject_name(&cls->kset.kobj));
38457ab3 AK	158	if (cls->attrs)
	159	sysfs_remove_files(&cls->kset.kobj,
	160	(const struct attribute **)cls->attrs);
1da177e4 LT	161	kset_unregister(&cls->kset);
	162	}
	163
	164	EXPORT_SYMBOL_GPL(sysdev_class_register);
	165	EXPORT_SYMBOL_GPL(sysdev_class_unregister);
	166
9f3f776b	167	static DEFINE_MUTEX(sysdev_drivers_lock);
1da177e4	168
f4203e30 BP	169	/*
	170	* @dev != NULL means that we're unwinding because some drv->add()
	171	* failed for some reason. You need to grab sysdev_drivers_lock before
	172	* calling this.
	173	*/
	174	static void __sysdev_driver_remove(struct sysdev_class *cls,
	175	struct sysdev_driver *drv,
	176	struct sys_device *from_dev)
	177	{
	178	struct sys_device *dev = from_dev;
	179
	180	list_del_init(&drv->entry);
	181	if (!cls)
	182	return;
	183
	184	if (!drv->remove)
	185	goto kset_put;
	186
	187	if (dev)
	188	list_for_each_entry_continue_reverse(dev, &cls->kset.list,
	189	kobj.entry)
	190	drv->remove(dev);
	191	else
	192	list_for_each_entry(dev, &cls->kset.list, kobj.entry)
	193	drv->remove(dev);
	194
	195	kset_put:
	196	kset_put(&cls->kset);
	197	}
	198
1da177e4	199	/**
25985edc	200	* sysdev_driver_register - Register auxiliary driver
44b760a8	201	* @cls: Device class driver belongs to.
1da177e4 LT	202	* @drv: Driver.
1da177e4 LT	203	*
44b760a8	204	* @drv is inserted into @cls->drivers to be
1da177e4 LT	205	* called on each operation on devices of that class. The refcount
1da177e4 LT	206	* of @cls is incremented.
1da177e4	207	*/
44b760a8	208	int sysdev_driver_register(struct sysdev_class cls, struct sysdev_driver drv)
1da177e4	209	{
f4203e30	210	struct sys_device *dev = NULL;
44b760a8 AM	211	int err = 0;
44b760a8 AM	212
da009f39	213	if (!cls) {
345279bc BP	214	WARN(1, KERN_WARNING "sysdev: invalid class passed to %s!\n",
345279bc BP	215	__func__);
da009f39 BD	216	return -EINVAL;
	217	}
	218
	219	/* Check whether this driver has already been added to a class. */
f810a5cf AV	220	if (drv->entry.next && !list_empty(&drv->entry))
f810a5cf AV	221	WARN(1, KERN_WARNING "sysdev: class %s: driver (%p) has already"
da009f39 BD	222	" been registered to a class, something is wrong, but "
da009f39 BD	223	"will forge on!\n", cls->name, drv);
da009f39	224
9f3f776b	225	mutex_lock(&sysdev_drivers_lock);
1da177e4 LT	226	if (cls && kset_get(&cls->kset)) {
	227	list_add_tail(&drv->entry, &cls->drivers);
	228
	229	/* If devices of this class already exist, tell the driver */
	230	if (drv->add) {
f4203e30 BP	231	list_for_each_entry(dev, &cls->kset.list, kobj.entry) {
	232	err = drv->add(dev);
	233	if (err)
	234	goto unwind;
	235	}
1da177e4	236	}
44b760a8 AM	237	} else {
44b760a8 AM	238	err = -EINVAL;
f810a5cf	239	WARN(1, KERN_ERR "%s: invalid device class\n", __func__);
44b760a8	240	}
f4203e30 BP	241
	242	goto unlock;
	243
	244	unwind:
	245	__sysdev_driver_remove(cls, drv, dev);
	246
	247	unlock:
9f3f776b	248	mutex_unlock(&sysdev_drivers_lock);
44b760a8	249	return err;
1da177e4 LT	250	}
1da177e4 LT	251
1da177e4	252	/**
25985edc	253	* sysdev_driver_unregister - Remove an auxiliary driver.
1da177e4 LT	254	* @cls: Class driver belongs to.
	255	* @drv: Driver.
	256	*/
60530afe ZX	257	void sysdev_driver_unregister(struct sysdev_class *cls,
60530afe ZX	258	struct sysdev_driver *drv)
1da177e4	259	{
9f3f776b	260	mutex_lock(&sysdev_drivers_lock);
f4203e30	261	__sysdev_driver_remove(cls, drv, NULL);
9f3f776b	262	mutex_unlock(&sysdev_drivers_lock);
1da177e4	263	}
1da177e4 LT	264	EXPORT_SYMBOL_GPL(sysdev_driver_register);
	265	EXPORT_SYMBOL_GPL(sysdev_driver_unregister);
	266
1da177e4 LT	267	/**
	268	* sysdev_register - add a system device to the tree
	269	* @sysdev: device in question
	270	*
	271	*/
60530afe	272	int sysdev_register(struct sys_device *sysdev)
1da177e4 LT	273	{
1da177e4 LT	274	int error;
60530afe	275	struct sysdev_class *cls = sysdev->cls;
1da177e4 LT	276
	277	if (!cls)
	278	return -EINVAL;
	279
838ea8e8 BD	280	pr_debug("Registering sys device of class '%s'\n",
838ea8e8 BD	281	kobject_name(&cls->kset.kobj));
61030bfb	282
ef79df26 GKH	283	/* initialize the kobject to 0, in case it had previously been used */
	284	memset(&sysdev->kobj, 0x00, sizeof(struct kobject));
	285
1da177e4 LT	286	/* Make sure the kset is set */
	287	sysdev->kobj.kset = &cls->kset;
	288
1da177e4	289	/* Register the object */
61030bfb GKH	290	error = kobject_init_and_add(&sysdev->kobj, &ktype_sysdev, NULL,
	291	"%s%d", kobject_name(&cls->kset.kobj),
	292	sysdev->id);
1da177e4 LT	293
1da177e4 LT	294	if (!error) {
60530afe	295	struct sysdev_driver *drv;
1da177e4	296
838ea8e8 BD	297	pr_debug("Registering sys device '%s'\n",
	298	kobject_name(&sysdev->kobj));
	299
9f3f776b	300	mutex_lock(&sysdev_drivers_lock);
1da177e4 LT	301	/* Generic notification is implicit, because it's that
	302	* code that should have called us.
	303	*/
	304
25985edc	305	/* Notify class auxiliary drivers */
1da177e4 LT	306	list_for_each_entry(drv, &cls->drivers, entry) {
	307	if (drv->add)
	308	drv->add(sysdev);
	309	}
9f3f776b	310	mutex_unlock(&sysdev_drivers_lock);
79f0313b	311	kobject_uevent(&sysdev->kobj, KOBJ_ADD);
1da177e4	312	}
838ea8e8	313
1da177e4 LT	314	return error;
	315	}
	316
60530afe	317	void sysdev_unregister(struct sys_device *sysdev)
1da177e4	318	{
60530afe	319	struct sysdev_driver *drv;
1da177e4	320
9f3f776b	321	mutex_lock(&sysdev_drivers_lock);
1da177e4 LT	322	list_for_each_entry(drv, &sysdev->cls->drivers, entry) {
	323	if (drv->remove)
	324	drv->remove(sysdev);
	325	}
9f3f776b	326	mutex_unlock(&sysdev_drivers_lock);
1da177e4	327
c10997f6	328	kobject_put(&sysdev->kobj);
1da177e4 LT	329	}
1da177e4 LT	330
2e711c04 RW	331	EXPORT_SYMBOL_GPL(sysdev_register);
2e711c04 RW	332	EXPORT_SYMBOL_GPL(sysdev_unregister);
1da177e4 LT	333
	334	int __init system_bus_init(void)
	335	{
aade4041 GKH	336	system_kset = kset_create_and_add("system", NULL, &devices_kset->kobj);
	337	if (!system_kset)
	338	return -ENOMEM;
	339	return 0;
1da177e4 LT	340	}
1da177e4 LT	341
9800794a AK	342	#define to_ext_attr(x) container_of(x, struct sysdev_ext_attribute, attr)
	343
	344	ssize_t sysdev_store_ulong(struct sys_device *sysdev,
	345	struct sysdev_attribute *attr,
	346	const char *buf, size_t size)
	347	{
	348	struct sysdev_ext_attribute *ea = to_ext_attr(attr);
	349	char *end;
	350	unsigned long new = simple_strtoul(buf, &end, 0);
	351	if (end == buf)
	352	return -EINVAL;
	353	(unsigned long )(ea->var) = new;
4e318d7c AK	354	/* Always return full write size even if we didn't consume all */
4e318d7c AK	355	return size;
9800794a AK	356	}
	357	EXPORT_SYMBOL_GPL(sysdev_store_ulong);
	358
	359	ssize_t sysdev_show_ulong(struct sys_device *sysdev,
	360	struct sysdev_attribute *attr,
	361	char *buf)
	362	{
	363	struct sysdev_ext_attribute *ea = to_ext_attr(attr);
	364	return snprintf(buf, PAGE_SIZE, "%lx\n", (unsigned long )(ea->var));
	365	}
	366	EXPORT_SYMBOL_GPL(sysdev_show_ulong);
	367
	368	ssize_t sysdev_store_int(struct sys_device *sysdev,
	369	struct sysdev_attribute *attr,
	370	const char *buf, size_t size)
	371	{
	372	struct sysdev_ext_attribute *ea = to_ext_attr(attr);
	373	char *end;
	374	long new = simple_strtol(buf, &end, 0);
	375	if (end == buf \|\| new > INT_MAX \|\| new < INT_MIN)
	376	return -EINVAL;
	377	(int )(ea->var) = new;
4e318d7c AK	378	/* Always return full write size even if we didn't consume all */
4e318d7c AK	379	return size;
9800794a AK	380	}
	381	EXPORT_SYMBOL_GPL(sysdev_store_int);
	382
	383	ssize_t sysdev_show_int(struct sys_device *sysdev,
	384	struct sysdev_attribute *attr,
	385	char *buf)
	386	{
	387	struct sysdev_ext_attribute *ea = to_ext_attr(attr);
	388	return snprintf(buf, PAGE_SIZE, "%d\n", (int )(ea->var));
	389	}
	390	EXPORT_SYMBOL_GPL(sysdev_show_int);
	391