[net-next-2.6.git] / net / caif / caif_dev.c

/*
 * CAIF Interface registration.
 * Copyright (C) ST-Ericsson AB 2010
 * Author:	Sjur Brendeland/sjur.brandeland@stericsson.com
 * License terms: GNU General Public License (GPL) version 2
 *
 * Borrowed heavily from file: pn_dev.c. Thanks to
 *  Remi Denis-Courmont <remi.denis-courmont@nokia.com>
 *  and Sakari Ailus <sakari.ailus@nokia.com>
 */

#include <linux/version.h>
#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/if_arp.h>
#include <linux/net.h>
#include <linux/netdevice.h>
#include <linux/skbuff.h>
#include <linux/sched.h>
#include <linux/wait.h>
#include <net/netns/generic.h>
#include <net/net_namespace.h>
#include <net/pkt_sched.h>
#include <net/caif/caif_device.h>
#include <net/caif/caif_dev.h>
#include <net/caif/caif_layer.h>
#include <net/caif/cfpkt.h>
#include <net/caif/cfcnfg.h>

MODULE_LICENSE("GPL");
#define TIMEOUT (HZ*5)

/* Used for local tracking of the CAIF net devices */
struct caif_device_entry {
	struct cflayer layer;
	struct list_head list;
	atomic_t in_use;
	atomic_t state;
	u16 phyid;
	struct net_device *netdev;
	wait_queue_head_t event;
};

struct caif_device_entry_list {
	struct list_head list;
	/* Protects simulanous deletes in list */
	spinlock_t lock;
};

struct caif_net {
	struct caif_device_entry_list caifdevs;
};

static int caif_net_id;
static struct cfcnfg *cfg;

static struct caif_device_entry_list *caif_device_list(struct net *net)
{
	struct caif_net *caifn;
	BUG_ON(!net);
	caifn = net_generic(net, caif_net_id);
	BUG_ON(!caifn);
	return &caifn->caifdevs;
}

/* Allocate new CAIF device. */
static struct caif_device_entry *caif_device_alloc(struct net_device *dev)
{
	struct caif_device_entry_list *caifdevs;
	struct caif_device_entry *caifd;
	caifdevs = caif_device_list(dev_net(dev));
	BUG_ON(!caifdevs);
	caifd = kzalloc(sizeof(*caifd), GFP_ATOMIC);
	if (!caifd)
		return NULL;
	caifd->netdev = dev;
	list_add(&caifd->list, &caifdevs->list);
	init_waitqueue_head(&caifd->event);
	return caifd;
}

static struct caif_device_entry *caif_get(struct net_device *dev)
{
	struct caif_device_entry_list *caifdevs =
	    caif_device_list(dev_net(dev));
	struct caif_device_entry *caifd;
	BUG_ON(!caifdevs);
	list_for_each_entry(caifd, &caifdevs->list, list) {
		if (caifd->netdev == dev)
			return caifd;
	}
	return NULL;
}

static void caif_device_destroy(struct net_device *dev)
{
	struct caif_device_entry_list *caifdevs =
	    caif_device_list(dev_net(dev));
	struct caif_device_entry *caifd;
	ASSERT_RTNL();
	if (dev->type != ARPHRD_CAIF)
		return;

	spin_lock_bh(&caifdevs->lock);
	caifd = caif_get(dev);
	if (caifd == NULL) {
		spin_unlock_bh(&caifdevs->lock);
		return;
	}

	list_del(&caifd->list);
	spin_unlock_bh(&caifdevs->lock);

	kfree(caifd);
}

static int transmit(struct cflayer *layer, struct cfpkt *pkt)
{
	struct caif_device_entry *caifd =
	    container_of(layer, struct caif_device_entry, layer);
	struct sk_buff *skb, *skb2;
	int ret = -EINVAL;
	skb = cfpkt_tonative(pkt);
	skb->dev = caifd->netdev;
	/*
	 * Don't allow SKB to be destroyed upon error, but signal resend
	 * notification to clients. We can't rely on the return value as
	 * congestion (NET_XMIT_CN) sometimes drops the packet, sometimes don't.
	 */
	if (netif_queue_stopped(caifd->netdev))
		return -EAGAIN;
	skb2 = skb_get(skb);

	ret = dev_queue_xmit(skb2);

	if (!ret)
		kfree_skb(skb);
	else
		return -EAGAIN;

	return 0;
}

static int modemcmd(struct cflayer *layr, enum caif_modemcmd ctrl)
{
	struct caif_device_entry *caifd;
	struct caif_dev_common *caifdev;
	caifd = container_of(layr, struct caif_device_entry, layer);
	caifdev = netdev_priv(caifd->netdev);
	if (ctrl == _CAIF_MODEMCMD_PHYIF_USEFULL) {
		atomic_set(&caifd->in_use, 1);
		wake_up_interruptible(&caifd->event);

	} else if (ctrl == _CAIF_MODEMCMD_PHYIF_USELESS) {
		atomic_set(&caifd->in_use, 0);
		wake_up_interruptible(&caifd->event);
	}
	return 0;
}

/*
 * Stuff received packets to associated sockets.
 * On error, returns non-zero and releases the skb.
 */
static int receive(struct sk_buff *skb, struct net_device *dev,
		   struct packet_type *pkttype, struct net_device *orig_dev)
{
	struct net *net;
	struct cfpkt *pkt;
	struct caif_device_entry *caifd;
	net = dev_net(dev);
	pkt = cfpkt_fromnative(CAIF_DIR_IN, skb);
	caifd = caif_get(dev);
	if (!caifd || !caifd->layer.up || !caifd->layer.up->ctrlcmd)
		return NET_RX_DROP;

	if (caifd->layer.up->receive(caifd->layer.up, pkt))
		return NET_RX_DROP;

	return 0;
}

static struct packet_type caif_packet_type __read_mostly = {
	.type = cpu_to_be16(ETH_P_CAIF),
	.func = receive,
};

static void dev_flowctrl(struct net_device *dev, int on)
{
	struct caif_device_entry *caifd = caif_get(dev);
	if (!caifd || !caifd->layer.up || !caifd->layer.up->ctrlcmd)
		return;

	caifd->layer.up->ctrlcmd(caifd->layer.up,
				 on ?
				 _CAIF_CTRLCMD_PHYIF_FLOW_ON_IND :
				 _CAIF_CTRLCMD_PHYIF_FLOW_OFF_IND,
				 caifd->layer.id);
}

/* notify Caif of device events */
static int caif_device_notify(struct notifier_block *me, unsigned long what,
			      void *arg)
{
	struct net_device *dev = arg;
	struct caif_device_entry *caifd = NULL;
	struct caif_dev_common *caifdev;
	enum cfcnfg_phy_preference pref;
	int res = -EINVAL;
	enum cfcnfg_phy_type phy_type;

	if (dev->type != ARPHRD_CAIF)
		return 0;

	switch (what) {
	case NETDEV_REGISTER:
		pr_info("CAIF: %s():register %s\n", __func__, dev->name);
		caifd = caif_device_alloc(dev);
		if (caifd == NULL)
			break;
		caifdev = netdev_priv(dev);
		caifdev->flowctrl = dev_flowctrl;
		atomic_set(&caifd->state, what);
		res = 0;
		break;

	case NETDEV_UP:
		pr_info("CAIF: %s(): up %s\n", __func__, dev->name);
		caifd = caif_get(dev);
		if (caifd == NULL)
			break;
		caifdev = netdev_priv(dev);
		if (atomic_read(&caifd->state) == NETDEV_UP) {
			pr_info("CAIF: %s():%s already up\n",
				__func__, dev->name);
			break;
		}
		atomic_set(&caifd->state, what);
		caifd->layer.transmit = transmit;
		caifd->layer.modemcmd = modemcmd;

		if (caifdev->use_frag)
			phy_type = CFPHYTYPE_FRAG;
		else
			phy_type = CFPHYTYPE_CAIF;

		switch (caifdev->link_select) {
		case CAIF_LINK_HIGH_BANDW:
			pref = CFPHYPREF_HIGH_BW;
			break;
		case CAIF_LINK_LOW_LATENCY:
			pref = CFPHYPREF_LOW_LAT;
			break;
		default:
			pref = CFPHYPREF_HIGH_BW;
			break;
		}

		cfcnfg_add_phy_layer(get_caif_conf(),
				     phy_type,
				     dev,
				     &caifd->layer,
				     &caifd->phyid,
				     pref,
				     caifdev->use_fcs,
				     caifdev->use_stx);
		strncpy(caifd->layer.name, dev->name,
			sizeof(caifd->layer.name) - 1);
		caifd->layer.name[sizeof(caifd->layer.name) - 1] = 0;
		break;

	case NETDEV_GOING_DOWN:
		caifd = caif_get(dev);
		if (caifd == NULL)
			break;
		pr_info("CAIF: %s():going down %s\n", __func__, dev->name);

		if (atomic_read(&caifd->state) == NETDEV_GOING_DOWN ||
			atomic_read(&caifd->state) == NETDEV_DOWN)
			break;

		atomic_set(&caifd->state, what);
		if (!caifd || !caifd->layer.up || !caifd->layer.up->ctrlcmd)
			return -EINVAL;
		caifd->layer.up->ctrlcmd(caifd->layer.up,
					 _CAIF_CTRLCMD_PHYIF_DOWN_IND,
					 caifd->layer.id);
		res = wait_event_interruptible_timeout(caifd->event,
					atomic_read(&caifd->in_use) == 0,
					TIMEOUT);
		break;

	case NETDEV_DOWN:
		caifd = caif_get(dev);
		if (caifd == NULL)
			break;
		pr_info("CAIF: %s(): down %s\n", __func__, dev->name);
		if (atomic_read(&caifd->in_use))
			pr_warning("CAIF: %s(): "
				   "Unregistering an active CAIF device: %s\n",
				   __func__, dev->name);
		cfcnfg_del_phy_layer(get_caif_conf(), &caifd->layer);
		atomic_set(&caifd->state, what);
		break;

	case NETDEV_UNREGISTER:
		caifd = caif_get(dev);
		pr_info("CAIF: %s(): unregister %s\n", __func__, dev->name);
		atomic_set(&caifd->state, what);
		caif_device_destroy(dev);
		break;
	}
	return 0;
}

static struct notifier_block caif_device_notifier = {
	.notifier_call = caif_device_notify,
	.priority = 0,
};


struct cfcnfg *get_caif_conf(void)
{
	return cfg;
}
EXPORT_SYMBOL(get_caif_conf);

int caif_connect_client(struct caif_connect_request *conn_req,
			   struct cflayer *client_layer)
{
	struct cfctrl_link_param param;
	int ret;
	ret = connect_req_to_link_param(get_caif_conf(), conn_req, &param);
	if (ret)
		return ret;
	/* Hook up the adaptation layer. */
	return cfcnfg_add_adaptation_layer(get_caif_conf(),
						&param, client_layer);
}
EXPORT_SYMBOL(caif_connect_client);

int caif_disconnect_client(struct cflayer *adap_layer)
{
       return cfcnfg_disconn_adapt_layer(get_caif_conf(), adap_layer);
}
EXPORT_SYMBOL(caif_disconnect_client);

void caif_release_client(struct cflayer *adap_layer)
{
       cfcnfg_release_adap_layer(adap_layer);
}
EXPORT_SYMBOL(caif_release_client);

/* Per-namespace Caif devices handling */
static int caif_init_net(struct net *net)
{
	struct caif_net *caifn = net_generic(net, caif_net_id);
	INIT_LIST_HEAD(&caifn->caifdevs.list);
	spin_lock_init(&caifn->caifdevs.lock);
	return 0;
}

static void caif_exit_net(struct net *net)
{
	struct net_device *dev;
	int res;
	rtnl_lock();
	for_each_netdev(net, dev) {
		if (dev->type != ARPHRD_CAIF)
			continue;
		res = dev_close(dev);
		caif_device_destroy(dev);
	}
	rtnl_unlock();
}

static struct pernet_operations caif_net_ops = {
	.init = caif_init_net,
	.exit = caif_exit_net,
	.id   = &caif_net_id,
	.size = sizeof(struct caif_net),
};

/* Initialize Caif devices list */
static int __init caif_device_init(void)
{
	int result;
	cfg = cfcnfg_create();
	if (!cfg) {
		pr_warning("CAIF: %s(): can't create cfcnfg.\n", __func__);
		goto err_cfcnfg_create_failed;
	}
	result = register_pernet_device(&caif_net_ops);

	if (result) {
		kfree(cfg);
		cfg = NULL;
		return result;
	}
	dev_add_pack(&caif_packet_type);
	register_netdevice_notifier(&caif_device_notifier);

	return result;
err_cfcnfg_create_failed:
	return -ENODEV;
}

static void __exit caif_device_exit(void)
{
	dev_remove_pack(&caif_packet_type);
	unregister_pernet_device(&caif_net_ops);
	unregister_netdevice_notifier(&caif_device_notifier);
	cfcnfg_remove(cfg);
}

module_init(caif_device_init);
module_exit(caif_device_exit);
Commit	Line	Data
c72dfae2 SB	1	/*
	2	* CAIF Interface registration.
	3	* Copyright (C) ST-Ericsson AB 2010
	4	* Author: Sjur Brendeland/sjur.brandeland@stericsson.com
	5	* License terms: GNU General Public License (GPL) version 2
	6	*
	7	* Borrowed heavily from file: pn_dev.c. Thanks to
	8	* Remi Denis-Courmont <remi.denis-courmont@nokia.com>
	9	* and Sakari Ailus <sakari.ailus@nokia.com>
	10	*/
	11
	12	#include <linux/version.h>
	13	#include <linux/module.h>
	14	#include <linux/kernel.h>
	15	#include <linux/if_arp.h>
	16	#include <linux/net.h>
	17	#include <linux/netdevice.h>
	18	#include <linux/skbuff.h>
	19	#include <linux/sched.h>
	20	#include <linux/wait.h>
	21	#include <net/netns/generic.h>
	22	#include <net/net_namespace.h>
	23	#include <net/pkt_sched.h>
	24	#include <net/caif/caif_device.h>
	25	#include <net/caif/caif_dev.h>
	26	#include <net/caif/caif_layer.h>
	27	#include <net/caif/cfpkt.h>
	28	#include <net/caif/cfcnfg.h>
	29
	30	MODULE_LICENSE("GPL");
	31	#define TIMEOUT (HZ*5)
	32
	33	/* Used for local tracking of the CAIF net devices */
	34	struct caif_device_entry {
	35	struct cflayer layer;
	36	struct list_head list;
	37	atomic_t in_use;
	38	atomic_t state;
	39	u16 phyid;
	40	struct net_device *netdev;
	41	wait_queue_head_t event;
	42	};
	43
	44	struct caif_device_entry_list {
	45	struct list_head list;
	46	/* Protects simulanous deletes in list */
	47	spinlock_t lock;
	48	};
	49
	50	struct caif_net {
	51	struct caif_device_entry_list caifdevs;
	52	};
	53
	54	static int caif_net_id;
	55	static struct cfcnfg *cfg;
	56
	57	static struct caif_device_entry_list caif_device_list(struct net net)
	58	{
	59	struct caif_net *caifn;
	60	BUG_ON(!net);
	61	caifn = net_generic(net, caif_net_id);
	62	BUG_ON(!caifn);
	63	return &caifn->caifdevs;
	64	}
65
66	/* Allocate new CAIF device. */
67	static struct caif_device_entry caif_device_alloc(struct net_device dev)
68	{
69	struct caif_device_entry_list *caifdevs;
70	struct caif_device_entry *caifd;
71	caifdevs = caif_device_list(dev_net(dev));
72	BUG_ON(!caifdevs);
73	caifd = kzalloc(sizeof(*caifd), GFP_ATOMIC);
74	if (!caifd)
75	return NULL;
76	caifd->netdev = dev;
77	list_add(&caifd->list, &caifdevs->list);
78	init_waitqueue_head(&caifd->event);
79	return caifd;
80	}
81
82	static struct caif_device_entry caif_get(struct net_device dev)
83	{
84	struct caif_device_entry_list *caifdevs =
85	caif_device_list(dev_net(dev));
86	struct caif_device_entry *caifd;
87	BUG_ON(!caifdevs);
88	list_for_each_entry(caifd, &caifdevs->list, list) {
89	if (caifd->netdev == dev)
90	return caifd;
91	}
92	return NULL;
93	}
94
95	static void caif_device_destroy(struct net_device *dev)
96	{
97	struct caif_device_entry_list *caifdevs =
98	caif_device_list(dev_net(dev));
99	struct caif_device_entry *caifd;
100	ASSERT_RTNL();
101	if (dev->type != ARPHRD_CAIF)
102	return;
103
104	spin_lock_bh(&caifdevs->lock);
105	caifd = caif_get(dev);
106	if (caifd == NULL) {
107	spin_unlock_bh(&caifdevs->lock);
108	return;
109	}
110
111	list_del(&caifd->list);
112	spin_unlock_bh(&caifdevs->lock);
113
114	kfree(caifd);
c72dfae2 SB	115	}
	116
	117	static int transmit(struct cflayer layer, struct cfpkt pkt)
	118	{
	119	struct caif_device_entry *caifd =
	120	container_of(layer, struct caif_device_entry, layer);
	121	struct sk_buff skb, skb2;
	122	int ret = -EINVAL;
	123	skb = cfpkt_tonative(pkt);
	124	skb->dev = caifd->netdev;
	125	/*
	126	* Don't allow SKB to be destroyed upon error, but signal resend
	127	* notification to clients. We can't rely on the return value as
	128	* congestion (NET_XMIT_CN) sometimes drops the packet, sometimes don't.
	129	*/
	130	if (netif_queue_stopped(caifd->netdev))
	131	return -EAGAIN;
	132	skb2 = skb_get(skb);
	133
	134	ret = dev_queue_xmit(skb2);
	135
	136	if (!ret)
	137	kfree_skb(skb);
	138	else
	139	return -EAGAIN;
	140
	141	return 0;
	142	}
	143
	144	static int modemcmd(struct cflayer *layr, enum caif_modemcmd ctrl)
	145	{
	146	struct caif_device_entry *caifd;
	147	struct caif_dev_common *caifdev;
	148	caifd = container_of(layr, struct caif_device_entry, layer);
	149	caifdev = netdev_priv(caifd->netdev);
	150	if (ctrl == _CAIF_MODEMCMD_PHYIF_USEFULL) {
	151	atomic_set(&caifd->in_use, 1);
	152	wake_up_interruptible(&caifd->event);
	153
	154	} else if (ctrl == _CAIF_MODEMCMD_PHYIF_USELESS) {
	155	atomic_set(&caifd->in_use, 0);
	156	wake_up_interruptible(&caifd->event);
	157	}
	158	return 0;
	159	}
	160
	161	/*
	162	* Stuff received packets to associated sockets.
	163	* On error, returns non-zero and releases the skb.
	164	*/
	165	static int receive(struct sk_buff skb, struct net_device dev,
	166	struct packet_type pkttype, struct net_device orig_dev)
	167	{
	168	struct net *net;
	169	struct cfpkt *pkt;
	170	struct caif_device_entry *caifd;
	171	net = dev_net(dev);
	172	pkt = cfpkt_fromnative(CAIF_DIR_IN, skb);
	173	caifd = caif_get(dev);
	174	if (!caifd \|\| !caifd->layer.up \|\| !caifd->layer.up->ctrlcmd)
	175	return NET_RX_DROP;
	176
	177	if (caifd->layer.up->receive(caifd->layer.up, pkt))
	178	return NET_RX_DROP;
179
180	return 0;
181	}
182
183	static struct packet_type caif_packet_type __read_mostly = {
184	.type = cpu_to_be16(ETH_P_CAIF),
185	.func = receive,
186	};
187
188	static void dev_flowctrl(struct net_device *dev, int on)
189	{
190	struct caif_device_entry *caifd = caif_get(dev);
191	if (!caifd \|\| !caifd->layer.up \|\| !caifd->layer.up->ctrlcmd)
192	return;
193
194	caifd->layer.up->ctrlcmd(caifd->layer.up,
195	on ?
196	_CAIF_CTRLCMD_PHYIF_FLOW_ON_IND :
197	_CAIF_CTRLCMD_PHYIF_FLOW_OFF_IND,
198	caifd->layer.id);
199	}
200
201	/* notify Caif of device events */
202	static int caif_device_notify(struct notifier_block *me, unsigned long what,
203	void *arg)
204	{
205	struct net_device *dev = arg;
206	struct caif_device_entry *caifd = NULL;
207	struct caif_dev_common *caifdev;
208	enum cfcnfg_phy_preference pref;
209	int res = -EINVAL;
210	enum cfcnfg_phy_type phy_type;
211
212	if (dev->type != ARPHRD_CAIF)
213	return 0;
214
215	switch (what) {
216	case NETDEV_REGISTER:
217	pr_info("CAIF: %s():register %s\n", __func__, dev->name);
218	caifd = caif_device_alloc(dev);
219	if (caifd == NULL)
220	break;
221	caifdev = netdev_priv(dev);
222	caifdev->flowctrl = dev_flowctrl;
223	atomic_set(&caifd->state, what);
224	res = 0;
225	break;
226
227	case NETDEV_UP:
228	pr_info("CAIF: %s(): up %s\n", __func__, dev->name);
229	caifd = caif_get(dev);
230	if (caifd == NULL)
231	break;
232	caifdev = netdev_priv(dev);
233	if (atomic_read(&caifd->state) == NETDEV_UP) {
234	pr_info("CAIF: %s():%s already up\n",
235	__func__, dev->name);
236	break;
237	}
238	atomic_set(&caifd->state, what);
239	caifd->layer.transmit = transmit;
240	caifd->layer.modemcmd = modemcmd;
241
242	if (caifdev->use_frag)
243	phy_type = CFPHYTYPE_FRAG;
244	else
245	phy_type = CFPHYTYPE_CAIF;
246
247	switch (caifdev->link_select) {
248	case CAIF_LINK_HIGH_BANDW:
2c485209	249	pref = CFPHYPREF_HIGH_BW;
c72dfae2 SB	250	break;
c72dfae2 SB	251	case CAIF_LINK_LOW_LATENCY:
2c485209	252	pref = CFPHYPREF_LOW_LAT;
c72dfae2 SB	253	break;
	254	default:
	255	pref = CFPHYPREF_HIGH_BW;
	256	break;
	257	}
	258
	259	cfcnfg_add_phy_layer(get_caif_conf(),
	260	phy_type,
	261	dev,
	262	&caifd->layer,
	263	&caifd->phyid,
	264	pref,
	265	caifdev->use_fcs,
	266	caifdev->use_stx);
	267	strncpy(caifd->layer.name, dev->name,
	268	sizeof(caifd->layer.name) - 1);
	269	caifd->layer.name[sizeof(caifd->layer.name) - 1] = 0;
	270	break;
	271
	272	case NETDEV_GOING_DOWN:
	273	caifd = caif_get(dev);
	274	if (caifd == NULL)
	275	break;
	276	pr_info("CAIF: %s():going down %s\n", __func__, dev->name);
	277
	278	if (atomic_read(&caifd->state) == NETDEV_GOING_DOWN \|\|
	279	atomic_read(&caifd->state) == NETDEV_DOWN)
	280	break;
	281
	282	atomic_set(&caifd->state, what);
	283	if (!caifd \|\| !caifd->layer.up \|\| !caifd->layer.up->ctrlcmd)
	284	return -EINVAL;
	285	caifd->layer.up->ctrlcmd(caifd->layer.up,
	286	_CAIF_CTRLCMD_PHYIF_DOWN_IND,
	287	caifd->layer.id);
	288	res = wait_event_interruptible_timeout(caifd->event,
	289	atomic_read(&caifd->in_use) == 0,
	290	TIMEOUT);
	291	break;
	292
	293	case NETDEV_DOWN:
	294	caifd = caif_get(dev);
	295	if (caifd == NULL)
	296	break;
	297	pr_info("CAIF: %s(): down %s\n", __func__, dev->name);
	298	if (atomic_read(&caifd->in_use))
	299	pr_warning("CAIF: %s(): "
	300	"Unregistering an active CAIF device: %s\n",
	301	__func__, dev->name);
	302	cfcnfg_del_phy_layer(get_caif_conf(), &caifd->layer);
	303	atomic_set(&caifd->state, what);
	304	break;
	305
	306	case NETDEV_UNREGISTER:
	307	caifd = caif_get(dev);
	308	pr_info("CAIF: %s(): unregister %s\n", __func__, dev->name);
	309	atomic_set(&caifd->state, what);
	310	caif_device_destroy(dev);
	311	break;
	312	}
	313	return 0;
	314	}
	315
	316	static struct notifier_block caif_device_notifier = {
317	.notifier_call = caif_device_notify,
318	.priority = 0,
319	};
320
321
322	struct cfcnfg *get_caif_conf(void)
323	{
324	return cfg;
325	}
326	EXPORT_SYMBOL(get_caif_conf);
327
328	int caif_connect_client(struct caif_connect_request *conn_req,
329	struct cflayer *client_layer)
330	{
331	struct cfctrl_link_param param;
e539d83c SB	332	int ret;
	333	ret = connect_req_to_link_param(get_caif_conf(), conn_req, &param);
	334	if (ret)
	335	return ret;
	336	/* Hook up the adaptation layer. */
	337	return cfcnfg_add_adaptation_layer(get_caif_conf(),
c72dfae2	338	&param, client_layer);
c72dfae2 SB	339	}
	340	EXPORT_SYMBOL(caif_connect_client);
	341
	342	int caif_disconnect_client(struct cflayer *adap_layer)
	343	{
e539d83c	344	return cfcnfg_disconn_adapt_layer(get_caif_conf(), adap_layer);
c72dfae2 SB	345	}
	346	EXPORT_SYMBOL(caif_disconnect_client);
	347
5b208656 SB	348	void caif_release_client(struct cflayer *adap_layer)
	349	{
	350	cfcnfg_release_adap_layer(adap_layer);
	351	}
	352	EXPORT_SYMBOL(caif_release_client);
	353
c72dfae2 SB	354	/* Per-namespace Caif devices handling */
	355	static int caif_init_net(struct net *net)
	356	{
	357	struct caif_net *caifn = net_generic(net, caif_net_id);
	358	INIT_LIST_HEAD(&caifn->caifdevs.list);
	359	spin_lock_init(&caifn->caifdevs.lock);
	360	return 0;
	361	}
	362
	363	static void caif_exit_net(struct net *net)
	364	{
	365	struct net_device *dev;
	366	int res;
	367	rtnl_lock();
	368	for_each_netdev(net, dev) {
	369	if (dev->type != ARPHRD_CAIF)
	370	continue;
	371	res = dev_close(dev);
	372	caif_device_destroy(dev);
	373	}
	374	rtnl_unlock();
	375	}
	376
	377	static struct pernet_operations caif_net_ops = {
	378	.init = caif_init_net,
	379	.exit = caif_exit_net,
	380	.id = &caif_net_id,
	381	.size = sizeof(struct caif_net),
	382	};
	383
	384	/* Initialize Caif devices list */
	385	static int __init caif_device_init(void)
	386	{
	387	int result;
	388	cfg = cfcnfg_create();
	389	if (!cfg) {
	390	pr_warning("CAIF: %s(): can't create cfcnfg.\n", __func__);
	391	goto err_cfcnfg_create_failed;
	392	}
	393	result = register_pernet_device(&caif_net_ops);
	394
	395	if (result) {
	396	kfree(cfg);
	397	cfg = NULL;
	398	return result;
	399	}
	400	dev_add_pack(&caif_packet_type);
	401	register_netdevice_notifier(&caif_device_notifier);
	402
	403	return result;
	404	err_cfcnfg_create_failed:
	405	return -ENODEV;
	406	}
	407
	408	static void __exit caif_device_exit(void)
	409	{
	410	dev_remove_pack(&caif_packet_type);
	411	unregister_pernet_device(&caif_net_ops);
	412	unregister_netdevice_notifier(&caif_device_notifier);
	413	cfcnfg_remove(cfg);
	414	}
	415
	416	module_init(caif_device_init);
	417	module_exit(caif_device_exit);