[deliverable/linux.git] / drivers / dca / dca-core.c

/*
 * Copyright(c) 2007 - 2009 Intel Corporation. All rights reserved.
 *
 * This program is free software; you can redistribute it and/or modify it
 * under the terms of the GNU General Public License as published by the Free
 * Software Foundation; either version 2 of the License, or (at your option)
 * any later version.
 *
 * This program is distributed in the hope that it will be useful, but WITHOUT
 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
 * more details.
 *
 * You should have received a copy of the GNU General Public License along with
 * this program; if not, write to the Free Software Foundation, Inc., 59
 * Temple Place - Suite 330, Boston, MA  02111-1307, USA.
 *
 * The full GNU General Public License is included in this distribution in the
 * file called COPYING.
 */

/*
 * This driver supports an interface for DCA clients and providers to meet.
 */

#include <linux/kernel.h>
#include <linux/notifier.h>
#include <linux/device.h>
#include <linux/dca.h>

#define DCA_VERSION "1.12.1"

MODULE_VERSION(DCA_VERSION);
MODULE_LICENSE("GPL");
MODULE_AUTHOR("Intel Corporation");

static DEFINE_SPINLOCK(dca_lock);

static LIST_HEAD(dca_domains);

static struct pci_bus *dca_pci_rc_from_dev(struct device *dev)
{
	struct pci_dev *pdev = to_pci_dev(dev);
	struct pci_bus *bus = pdev->bus;

	while (bus->parent)
		bus = bus->parent;

	return bus;
}

static struct dca_domain *dca_allocate_domain(struct pci_bus *rc)
{
	struct dca_domain *domain;

	domain = kzalloc(sizeof(*domain), GFP_NOWAIT);
	if (!domain)
		return NULL;

	INIT_LIST_HEAD(&domain->dca_providers);
	domain->pci_rc = rc;

	return domain;
}

static void dca_free_domain(struct dca_domain *domain)
{
	list_del(&domain->node);
	kfree(domain);
}

static struct dca_domain *dca_find_domain(struct pci_bus *rc)
{
	struct dca_domain *domain;

	list_for_each_entry(domain, &dca_domains, node)
		if (domain->pci_rc == rc)
			return domain;

	return NULL;
}

static struct dca_domain *dca_get_domain(struct device *dev)
{
	struct pci_bus *rc;
	struct dca_domain *domain;

	rc = dca_pci_rc_from_dev(dev);
	domain = dca_find_domain(rc);

	if (!domain) {
		domain = dca_allocate_domain(rc);
		if (domain)
			list_add(&domain->node, &dca_domains);
	}

	return domain;
}

static struct dca_provider *dca_find_provider_by_dev(struct device *dev)
{
	struct dca_provider *dca;
	struct pci_bus *rc;
	struct dca_domain *domain;

	if (dev) {
		rc = dca_pci_rc_from_dev(dev);
		domain = dca_find_domain(rc);
		if (!domain)
			return NULL;
	} else {
		if (!list_empty(&dca_domains))
			domain = list_first_entry(&dca_domains,
						  struct dca_domain,
						  node);
		else
			return NULL;
	}

	list_for_each_entry(dca, &domain->dca_providers, node)
		if ((!dev) || (dca->ops->dev_managed(dca, dev)))
			return dca;

	return NULL;
}

/**
 * dca_add_requester - add a dca client to the list
 * @dev - the device that wants dca service
 */
int dca_add_requester(struct device *dev)
{
	struct dca_provider *dca;
	int err, slot = -ENODEV;
	unsigned long flags;
	struct pci_bus *pci_rc;
	struct dca_domain *domain;

	if (!dev)
		return -EFAULT;

	spin_lock_irqsave(&dca_lock, flags);

	/* check if the requester has not been added already */
	dca = dca_find_provider_by_dev(dev);
	if (dca) {
		spin_unlock_irqrestore(&dca_lock, flags);
		return -EEXIST;
	}

	pci_rc = dca_pci_rc_from_dev(dev);
	domain = dca_find_domain(pci_rc);
	if (!domain) {
		spin_unlock_irqrestore(&dca_lock, flags);
		return -ENODEV;
	}

	list_for_each_entry(dca, &domain->dca_providers, node) {
		slot = dca->ops->add_requester(dca, dev);
		if (slot >= 0)
			break;
	}

	spin_unlock_irqrestore(&dca_lock, flags);

	if (slot < 0)
		return slot;

	err = dca_sysfs_add_req(dca, dev, slot);
	if (err) {
		spin_lock_irqsave(&dca_lock, flags);
		if (dca == dca_find_provider_by_dev(dev))
			dca->ops->remove_requester(dca, dev);
		spin_unlock_irqrestore(&dca_lock, flags);
		return err;
	}

	return 0;
}
EXPORT_SYMBOL_GPL(dca_add_requester);

/**
 * dca_remove_requester - remove a dca client from the list
 * @dev - the device that wants dca service
 */
int dca_remove_requester(struct device *dev)
{
	struct dca_provider *dca;
	int slot;
	unsigned long flags;

	if (!dev)
		return -EFAULT;

	spin_lock_irqsave(&dca_lock, flags);
	dca = dca_find_provider_by_dev(dev);
	if (!dca) {
		spin_unlock_irqrestore(&dca_lock, flags);
		return -ENODEV;
	}
	slot = dca->ops->remove_requester(dca, dev);
	spin_unlock_irqrestore(&dca_lock, flags);

	if (slot < 0)
		return slot;

	dca_sysfs_remove_req(dca, slot);

	return 0;
}
EXPORT_SYMBOL_GPL(dca_remove_requester);

/**
 * dca_common_get_tag - return the dca tag (serves both new and old api)
 * @dev - the device that wants dca service
 * @cpu - the cpuid as returned by get_cpu()
 */
u8 dca_common_get_tag(struct device *dev, int cpu)
{
	struct dca_provider *dca;
	u8 tag;
	unsigned long flags;

	spin_lock_irqsave(&dca_lock, flags);

	dca = dca_find_provider_by_dev(dev);
	if (!dca) {
		spin_unlock_irqrestore(&dca_lock, flags);
		return -ENODEV;
	}
	tag = dca->ops->get_tag(dca, dev, cpu);

	spin_unlock_irqrestore(&dca_lock, flags);
	return tag;
}

/**
 * dca3_get_tag - return the dca tag to the requester device
 *                for the given cpu (new api)
 * @dev - the device that wants dca service
 * @cpu - the cpuid as returned by get_cpu()
 */
u8 dca3_get_tag(struct device *dev, int cpu)
{
	if (!dev)
		return -EFAULT;

	return dca_common_get_tag(dev, cpu);
}
EXPORT_SYMBOL_GPL(dca3_get_tag);

/**
 * dca_get_tag - return the dca tag for the given cpu (old api)
 * @cpu - the cpuid as returned by get_cpu()
 */
u8 dca_get_tag(int cpu)
{
	struct device *dev = NULL;

	return dca_common_get_tag(dev, cpu);
}
EXPORT_SYMBOL_GPL(dca_get_tag);

/**
 * alloc_dca_provider - get data struct for describing a dca provider
 * @ops - pointer to struct of dca operation function pointers
 * @priv_size - size of extra mem to be added for provider's needs
 */
struct dca_provider *alloc_dca_provider(struct dca_ops *ops, int priv_size)
{
	struct dca_provider *dca;
	int alloc_size;

	alloc_size = (sizeof(*dca) + priv_size);
	dca = kzalloc(alloc_size, GFP_KERNEL);
	if (!dca)
		return NULL;
	dca->ops = ops;

	return dca;
}
EXPORT_SYMBOL_GPL(alloc_dca_provider);

/**
 * free_dca_provider - release the dca provider data struct
 * @ops - pointer to struct of dca operation function pointers
 * @priv_size - size of extra mem to be added for provider's needs
 */
void free_dca_provider(struct dca_provider *dca)
{
	kfree(dca);
}
EXPORT_SYMBOL_GPL(free_dca_provider);

static BLOCKING_NOTIFIER_HEAD(dca_provider_chain);

/**
 * register_dca_provider - register a dca provider
 * @dca - struct created by alloc_dca_provider()
 * @dev - device providing dca services
 */
int register_dca_provider(struct dca_provider *dca, struct device *dev)
{
	int err;
	unsigned long flags;
	struct dca_domain *domain;

	err = dca_sysfs_add_provider(dca, dev);
	if (err)
		return err;

	spin_lock_irqsave(&dca_lock, flags);
	domain = dca_get_domain(dev);
	if (!domain) {
		spin_unlock_irqrestore(&dca_lock, flags);
		return -ENODEV;
	}
	list_add(&dca->node, &domain->dca_providers);
	spin_unlock_irqrestore(&dca_lock, flags);

	blocking_notifier_call_chain(&dca_provider_chain,
				     DCA_PROVIDER_ADD, NULL);
	return 0;
}
EXPORT_SYMBOL_GPL(register_dca_provider);

/**
 * unregister_dca_provider - remove a dca provider
 * @dca - struct created by alloc_dca_provider()
 */
void unregister_dca_provider(struct dca_provider *dca, struct device *dev)
{
	unsigned long flags;
	struct pci_bus *pci_rc;
	struct dca_domain *domain;

	blocking_notifier_call_chain(&dca_provider_chain,
				     DCA_PROVIDER_REMOVE, NULL);

	spin_lock_irqsave(&dca_lock, flags);

	list_del(&dca->node);

	pci_rc = dca_pci_rc_from_dev(dev);
	domain = dca_find_domain(pci_rc);
	if (list_empty(&domain->dca_providers))
		dca_free_domain(domain);

	spin_unlock_irqrestore(&dca_lock, flags);

	dca_sysfs_remove_provider(dca);
}
EXPORT_SYMBOL_GPL(unregister_dca_provider);

/**
 * dca_register_notify - register a client's notifier callback
 */
void dca_register_notify(struct notifier_block *nb)
{
	blocking_notifier_chain_register(&dca_provider_chain, nb);
}
EXPORT_SYMBOL_GPL(dca_register_notify);

/**
 * dca_unregister_notify - remove a client's notifier callback
 */
void dca_unregister_notify(struct notifier_block *nb)
{
	blocking_notifier_chain_unregister(&dca_provider_chain, nb);
}
EXPORT_SYMBOL_GPL(dca_unregister_notify);

static int __init dca_init(void)
{
	pr_info("dca service started, version %s\n", DCA_VERSION);
	return dca_sysfs_init();
}

static void __exit dca_exit(void)
{
	dca_sysfs_exit();
}

arch_initcall(dca_init);
module_exit(dca_exit);
Commit	Line	Data
7589670f	1	/*
211a22ce	2	* Copyright(c) 2007 - 2009 Intel Corporation. All rights reserved.
7589670f SN	3	*
	4	* This program is free software; you can redistribute it and/or modify it
	5	* under the terms of the GNU General Public License as published by the Free
	6	* Software Foundation; either version 2 of the License, or (at your option)
	7	* any later version.
	8	*
	9	* This program is distributed in the hope that it will be useful, but WITHOUT
	10	* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
	11	* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
	12	* more details.
	13	*
	14	* You should have received a copy of the GNU General Public License along with
	15	* this program; if not, write to the Free Software Foundation, Inc., 59
	16	* Temple Place - Suite 330, Boston, MA 02111-1307, USA.
	17	*
	18	* The full GNU General Public License is included in this distribution in the
	19	* file called COPYING.
	20	*/
	21
	22	/*
	23	* This driver supports an interface for DCA clients and providers to meet.
	24	*/
	25
	26	#include <linux/kernel.h>
	27	#include <linux/notifier.h>
	28	#include <linux/device.h>
	29	#include <linux/dca.h>
	30
1a5aeeec	31	#define DCA_VERSION "1.12.1"
7589670f	32
7f1b358a MS	33	MODULE_VERSION(DCA_VERSION);
	34	MODULE_LICENSE("GPL");
	35	MODULE_AUTHOR("Intel Corporation");
7589670f SN	36
	37	static DEFINE_SPINLOCK(dca_lock);
	38
1a5aeeec	39	static LIST_HEAD(dca_domains);
7f1b358a	40
1a5aeeec	41	static struct pci_bus dca_pci_rc_from_dev(struct device dev)
7f1b358a	42	{
1a5aeeec MS	43	struct pci_dev *pdev = to_pci_dev(dev);
1a5aeeec MS	44	struct pci_bus *bus = pdev->bus;
7f1b358a	45
1a5aeeec MS	46	while (bus->parent)
	47	bus = bus->parent;
	48
	49	return bus;
	50	}
	51
	52	static struct dca_domain dca_allocate_domain(struct pci_bus rc)
	53	{
	54	struct dca_domain *domain;
	55
	56	domain = kzalloc(sizeof(*domain), GFP_NOWAIT);
	57	if (!domain)
	58	return NULL;
	59
	60	INIT_LIST_HEAD(&domain->dca_providers);
	61	domain->pci_rc = rc;
	62
	63	return domain;
	64	}
	65
	66	static void dca_free_domain(struct dca_domain *domain)
	67	{
	68	list_del(&domain->node);
	69	kfree(domain);
	70	}
	71
	72	static struct dca_domain dca_find_domain(struct pci_bus rc)
	73	{
	74	struct dca_domain *domain;
	75
	76	list_for_each_entry(domain, &dca_domains, node)
	77	if (domain->pci_rc == rc)
	78	return domain;
	79
	80	return NULL;
	81	}
	82
	83	static struct dca_domain dca_get_domain(struct device dev)
	84	{
	85	struct pci_bus *rc;
	86	struct dca_domain *domain;
	87
	88	rc = dca_pci_rc_from_dev(dev);
	89	domain = dca_find_domain(rc);
	90
	91	if (!domain) {
	92	domain = dca_allocate_domain(rc);
	93	if (domain)
	94	list_add(&domain->node, &dca_domains);
	95	}
	96
	97	return domain;
	98	}
	99
	100	static struct dca_provider dca_find_provider_by_dev(struct device dev)
	101	{
	102	struct dca_provider *dca;
	103	struct pci_bus *rc;
	104	struct dca_domain *domain;
	105
	106	if (dev) {
	107	rc = dca_pci_rc_from_dev(dev);
	108	domain = dca_find_domain(rc);
	109	if (!domain)
110	return NULL;
111	} else {
112	if (!list_empty(&dca_domains))
113	domain = list_first_entry(&dca_domains,
114	struct dca_domain,
115	node);
116	else
117	return NULL;
7f1b358a MS	118	}
7f1b358a MS	119
1a5aeeec MS	120	list_for_each_entry(dca, &domain->dca_providers, node)
	121	if ((!dev) \|\| (dca->ops->dev_managed(dca, dev)))
	122	return dca;
	123
	124	return NULL;
7f1b358a	125	}
7589670f SN	126
	127	/**
	128	* dca_add_requester - add a dca client to the list
	129	* @dev - the device that wants dca service
	130	*/
	131	int dca_add_requester(struct device *dev)
	132	{
7f1b358a MS	133	struct dca_provider *dca;
7f1b358a MS	134	int err, slot = -ENODEV;
eb4400e3	135	unsigned long flags;
1a5aeeec MS	136	struct pci_bus *pci_rc;
1a5aeeec MS	137	struct dca_domain *domain;
7589670f	138
7f1b358a MS	139	if (!dev)
7f1b358a MS	140	return -EFAULT;
7589670f	141
eb4400e3	142	spin_lock_irqsave(&dca_lock, flags);
7f1b358a MS	143
	144	/* check if the requester has not been added already */
	145	dca = dca_find_provider_by_dev(dev);
	146	if (dca) {
eb4400e3	147	spin_unlock_irqrestore(&dca_lock, flags);
7f1b358a MS	148	return -EEXIST;
	149	}
	150
1a5aeeec MS	151	pci_rc = dca_pci_rc_from_dev(dev);
	152	domain = dca_find_domain(pci_rc);
	153	if (!domain) {
	154	spin_unlock_irqrestore(&dca_lock, flags);
	155	return -ENODEV;
	156	}
	157
	158	list_for_each_entry(dca, &domain->dca_providers, node) {
7f1b358a MS	159	slot = dca->ops->add_requester(dca, dev);
	160	if (slot >= 0)
	161	break;
	162	}
eb4400e3 MS	163
	164	spin_unlock_irqrestore(&dca_lock, flags);
	165
	166	if (slot < 0)
7589670f SN	167	return slot;
7589670f SN	168
7f1b358a	169	err = dca_sysfs_add_req(dca, dev, slot);
7589670f	170	if (err) {
eb4400e3 MS	171	spin_lock_irqsave(&dca_lock, flags);
	172	if (dca == dca_find_provider_by_dev(dev))
	173	dca->ops->remove_requester(dca, dev);
	174	spin_unlock_irqrestore(&dca_lock, flags);
7589670f SN	175	return err;
	176	}
	177
	178	return 0;
	179	}
	180	EXPORT_SYMBOL_GPL(dca_add_requester);
	181
	182	/**
	183	* dca_remove_requester - remove a dca client from the list
	184	* @dev - the device that wants dca service
	185	*/
	186	int dca_remove_requester(struct device *dev)
	187	{
7f1b358a	188	struct dca_provider *dca;
7589670f	189	int slot;
eb4400e3	190	unsigned long flags;
7f1b358a MS	191
	192	if (!dev)
	193	return -EFAULT;
7589670f	194
eb4400e3	195	spin_lock_irqsave(&dca_lock, flags);
7f1b358a MS	196	dca = dca_find_provider_by_dev(dev);
7f1b358a MS	197	if (!dca) {
eb4400e3	198	spin_unlock_irqrestore(&dca_lock, flags);
7f1b358a MS	199	return -ENODEV;
	200	}
	201	slot = dca->ops->remove_requester(dca, dev);
eb4400e3 MS	202	spin_unlock_irqrestore(&dca_lock, flags);
	203
	204	if (slot < 0)
7589670f SN	205	return slot;
7589670f SN	206
7f1b358a MS	207	dca_sysfs_remove_req(dca, slot);
7f1b358a MS	208
7589670f SN	209	return 0;
	210	}
	211	EXPORT_SYMBOL_GPL(dca_remove_requester);
	212
	213	/**
7f1b358a MS	214	* dca_common_get_tag - return the dca tag (serves both new and old api)
7f1b358a MS	215	* @dev - the device that wants dca service
7589670f SN	216	* @cpu - the cpuid as returned by get_cpu()
7589670f SN	217	*/
7f1b358a	218	u8 dca_common_get_tag(struct device *dev, int cpu)
7589670f	219	{
7f1b358a MS	220	struct dca_provider *dca;
7f1b358a MS	221	u8 tag;
eb4400e3	222	unsigned long flags;
7f1b358a	223
eb4400e3	224	spin_lock_irqsave(&dca_lock, flags);
7f1b358a MS	225
	226	dca = dca_find_provider_by_dev(dev);
	227	if (!dca) {
eb4400e3	228	spin_unlock_irqrestore(&dca_lock, flags);
7589670f	229	return -ENODEV;
7f1b358a MS	230	}
	231	tag = dca->ops->get_tag(dca, dev, cpu);
	232
eb4400e3	233	spin_unlock_irqrestore(&dca_lock, flags);
7f1b358a MS	234	return tag;
	235	}
	236
	237	/**
	238	* dca3_get_tag - return the dca tag to the requester device
	239	* for the given cpu (new api)
	240	* @dev - the device that wants dca service
	241	* @cpu - the cpuid as returned by get_cpu()
	242	*/
	243	u8 dca3_get_tag(struct device *dev, int cpu)
	244	{
	245	if (!dev)
	246	return -EFAULT;
	247
	248	return dca_common_get_tag(dev, cpu);
	249	}
	250	EXPORT_SYMBOL_GPL(dca3_get_tag);
	251
	252	/**
	253	* dca_get_tag - return the dca tag for the given cpu (old api)
	254	* @cpu - the cpuid as returned by get_cpu()
	255	*/
	256	u8 dca_get_tag(int cpu)
	257	{
	258	struct device *dev = NULL;
	259
	260	return dca_common_get_tag(dev, cpu);
7589670f SN	261	}
	262	EXPORT_SYMBOL_GPL(dca_get_tag);
	263
	264	/**
	265	* alloc_dca_provider - get data struct for describing a dca provider
	266	* @ops - pointer to struct of dca operation function pointers
	267	* @priv_size - size of extra mem to be added for provider's needs
	268	*/
	269	struct dca_provider alloc_dca_provider(struct dca_ops ops, int priv_size)
	270	{
	271	struct dca_provider *dca;
	272	int alloc_size;
	273
	274	alloc_size = (sizeof(*dca) + priv_size);
	275	dca = kzalloc(alloc_size, GFP_KERNEL);
	276	if (!dca)
	277	return NULL;
	278	dca->ops = ops;
	279
	280	return dca;
	281	}
	282	EXPORT_SYMBOL_GPL(alloc_dca_provider);
	283
	284	/**
	285	* free_dca_provider - release the dca provider data struct
	286	* @ops - pointer to struct of dca operation function pointers
	287	* @priv_size - size of extra mem to be added for provider's needs
	288	*/
	289	void free_dca_provider(struct dca_provider *dca)
	290	{
	291	kfree(dca);
	292	}
	293	EXPORT_SYMBOL_GPL(free_dca_provider);
	294
	295	static BLOCKING_NOTIFIER_HEAD(dca_provider_chain);
	296
	297	/**
	298	* register_dca_provider - register a dca provider
	299	* @dca - struct created by alloc_dca_provider()
	300	* @dev - device providing dca services
	301	*/
	302	int register_dca_provider(struct dca_provider dca, struct device dev)
	303	{
	304	int err;
eb4400e3	305	unsigned long flags;
1a5aeeec	306	struct dca_domain *domain;
7589670f	307
7589670f SN	308	err = dca_sysfs_add_provider(dca, dev);
	309	if (err)
	310	return err;
eb4400e3 MS	311
eb4400e3 MS	312	spin_lock_irqsave(&dca_lock, flags);
1a5aeeec MS	313	domain = dca_get_domain(dev);
	314	if (!domain) {
	315	spin_unlock_irqrestore(&dca_lock, flags);
	316	return -ENODEV;
	317	}
	318	list_add(&dca->node, &domain->dca_providers);
eb4400e3 MS	319	spin_unlock_irqrestore(&dca_lock, flags);
eb4400e3 MS	320
7589670f SN	321	blocking_notifier_call_chain(&dca_provider_chain,
	322	DCA_PROVIDER_ADD, NULL);
	323	return 0;
	324	}
	325	EXPORT_SYMBOL_GPL(register_dca_provider);
	326
	327	/**
	328	* unregister_dca_provider - remove a dca provider
	329	* @dca - struct created by alloc_dca_provider()
	330	*/
1a5aeeec	331	void unregister_dca_provider(struct dca_provider dca, struct device dev)
7589670f	332	{
eb4400e3	333	unsigned long flags;
1a5aeeec MS	334	struct pci_bus *pci_rc;
1a5aeeec MS	335	struct dca_domain *domain;
eb4400e3	336
7589670f SN	337	blocking_notifier_call_chain(&dca_provider_chain,
7589670f SN	338	DCA_PROVIDER_REMOVE, NULL);
eb4400e3 MS	339
eb4400e3 MS	340	spin_lock_irqsave(&dca_lock, flags);
1a5aeeec	341
7f1b358a	342	list_del(&dca->node);
1a5aeeec MS	343
	344	pci_rc = dca_pci_rc_from_dev(dev);
	345	domain = dca_find_domain(pci_rc);
	346	if (list_empty(&domain->dca_providers))
	347	dca_free_domain(domain);
	348
eb4400e3 MS	349	spin_unlock_irqrestore(&dca_lock, flags);
eb4400e3 MS	350
7589670f SN	351	dca_sysfs_remove_provider(dca);
	352	}
	353	EXPORT_SYMBOL_GPL(unregister_dca_provider);
	354
	355	/**
	356	* dca_register_notify - register a client's notifier callback
	357	*/
	358	void dca_register_notify(struct notifier_block *nb)
	359	{
	360	blocking_notifier_chain_register(&dca_provider_chain, nb);
	361	}
	362	EXPORT_SYMBOL_GPL(dca_register_notify);
	363
	364	/**
	365	* dca_unregister_notify - remove a client's notifier callback
	366	*/
	367	void dca_unregister_notify(struct notifier_block *nb)
	368	{
	369	blocking_notifier_chain_unregister(&dca_provider_chain, nb);
	370	}
	371	EXPORT_SYMBOL_GPL(dca_unregister_notify);
	372
	373	static int __init dca_init(void)
	374	{
084dac53	375	pr_info("dca service started, version %s\n", DCA_VERSION);
7589670f SN	376	return dca_sysfs_init();
	377	}
	378
	379	static void __exit dca_exit(void)
	380	{
	381	dca_sysfs_exit();
	382	}
	383
652afc27	384	arch_initcall(dca_init);
7589670f SN	385	module_exit(dca_exit);
7589670f SN	386