[deliverable/linux.git] / net / nfc / core.c

/*
 * Copyright (C) 2011 Instituto Nokia de Tecnologia
 *
 * Authors:
 *    Lauro Ramos Venancio <lauro.venancio@openbossa.org>
 *    Aloisio Almeida Jr <aloisio.almeida@openbossa.org>
 *
 * 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.
 */

#include <linux/init.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/slab.h>

#include "nfc.h"

#define VERSION "0.1"

int nfc_devlist_generation;
DEFINE_MUTEX(nfc_devlist_mutex);

int nfc_printk(const char *level, const char *format, ...)
{
	struct va_format vaf;
	va_list args;
	int r;

	va_start(args, format);

	vaf.fmt = format;
	vaf.va = &args;

	r = printk("%sNFC: %pV\n", level, &vaf);

	va_end(args);

	return r;
}
EXPORT_SYMBOL(nfc_printk);

/**
 * nfc_start_poll - start polling for nfc targets
 *
 * @dev: The nfc device that must start polling
 * @protocols: bitset of nfc protocols that must be used for polling
 *
 * The device remains polling for targets until a target is found or
 * the nfc_stop_poll function is called.
 */
int nfc_start_poll(struct nfc_dev *dev, u32 protocols)
{
	int rc;

	nfc_dbg("dev_name=%s protocols=0x%x", dev_name(&dev->dev), protocols);

	if (!protocols)
		return -EINVAL;

	device_lock(&dev->dev);

	if (!device_is_registered(&dev->dev)) {
		rc = -ENODEV;
		goto error;
	}

	if (dev->polling) {
		rc = -EBUSY;
		goto error;
	}

	rc = dev->ops->start_poll(dev, protocols);
	if (!rc)
		dev->polling = true;

error:
	device_unlock(&dev->dev);
	return rc;
}

/**
 * nfc_stop_poll - stop polling for nfc targets
 *
 * @dev: The nfc device that must stop polling
 */
int nfc_stop_poll(struct nfc_dev *dev)
{
	int rc = 0;

	nfc_dbg("dev_name=%s", dev_name(&dev->dev));

	device_lock(&dev->dev);

	if (!device_is_registered(&dev->dev)) {
		rc = -ENODEV;
		goto error;
	}

	if (!dev->polling) {
		rc = -EINVAL;
		goto error;
	}

	dev->ops->stop_poll(dev);
	dev->polling = false;

error:
	device_unlock(&dev->dev);
	return rc;
}

/**
 * nfc_activate_target - prepare the target for data exchange
 *
 * @dev: The nfc device that found the target
 * @target_idx: index of the target that must be activated
 * @protocol: nfc protocol that will be used for data exchange
 */
int nfc_activate_target(struct nfc_dev *dev, u32 target_idx, u32 protocol)
{
	int rc;

	nfc_dbg("dev_name=%s target_idx=%u protocol=%u", dev_name(&dev->dev),
							target_idx, protocol);

	device_lock(&dev->dev);

	if (!device_is_registered(&dev->dev)) {
		rc = -ENODEV;
		goto error;
	}

	rc = dev->ops->activate_target(dev, target_idx, protocol);

error:
	device_unlock(&dev->dev);
	return rc;
}

/**
 * nfc_deactivate_target - deactivate a nfc target
 *
 * @dev: The nfc device that found the target
 * @target_idx: index of the target that must be deactivated
 */
int nfc_deactivate_target(struct nfc_dev *dev, u32 target_idx)
{
	int rc = 0;

	nfc_dbg("dev_name=%s target_idx=%u", dev_name(&dev->dev), target_idx);

	device_lock(&dev->dev);

	if (!device_is_registered(&dev->dev)) {
		rc = -ENODEV;
		goto error;
	}

	dev->ops->deactivate_target(dev, target_idx);

error:
	device_unlock(&dev->dev);
	return rc;
}

/**
 * nfc_data_exchange - transceive data
 *
 * @dev: The nfc device that found the target
 * @target_idx: index of the target
 * @skb: data to be sent
 * @cb: callback called when the response is received
 * @cb_context: parameter for the callback function
 *
 * The user must wait for the callback before calling this function again.
 */
int nfc_data_exchange(struct nfc_dev *dev, u32 target_idx,
					struct sk_buff *skb,
					data_exchange_cb_t cb,
					void *cb_context)
{
	int rc;

	nfc_dbg("dev_name=%s target_idx=%u skb->len=%u", dev_name(&dev->dev),
							target_idx, skb->len);

	device_lock(&dev->dev);

	if (!device_is_registered(&dev->dev)) {
		rc = -ENODEV;
		kfree_skb(skb);
		goto error;
	}

	rc = dev->ops->data_exchange(dev, target_idx, skb, cb, cb_context);

error:
	device_unlock(&dev->dev);
	return rc;
}

/**
 * nfc_alloc_skb - allocate a skb for data exchange responses
 *
 * @size: size to allocate
 * @gfp: gfp flags
 */
struct sk_buff *nfc_alloc_skb(unsigned int size, gfp_t gfp)
{
	struct sk_buff *skb;
	unsigned int total_size;

	total_size = size + 1;
	skb = alloc_skb(total_size, gfp);

	if (skb)
		skb_reserve(skb, 1);

	return skb;
}
EXPORT_SYMBOL(nfc_alloc_skb);

/**
 * nfc_targets_found - inform that targets were found
 *
 * @dev: The nfc device that found the targets
 * @targets: array of nfc targets found
 * @ntargets: targets array size
 *
 * The device driver must call this function when one or many nfc targets
 * are found. After calling this function, the device driver must stop
 * polling for targets.
 */
int nfc_targets_found(struct nfc_dev *dev, struct nfc_target *targets,
							int n_targets)
{
	int i;

	nfc_dbg("dev_name=%s n_targets=%d", dev_name(&dev->dev), n_targets);

	dev->polling = false;

	for (i = 0; i < n_targets; i++)
		targets[i].idx = dev->target_idx++;

	spin_lock_bh(&dev->targets_lock);

	dev->targets_generation++;

	kfree(dev->targets);
	dev->targets = kmemdup(targets, n_targets * sizeof(struct nfc_target),
								GFP_ATOMIC);

	if (!dev->targets) {
		dev->n_targets = 0;
		spin_unlock_bh(&dev->targets_lock);
		return -ENOMEM;
	}

	dev->n_targets = n_targets;
	spin_unlock_bh(&dev->targets_lock);

	nfc_genl_targets_found(dev);

	return 0;
}
EXPORT_SYMBOL(nfc_targets_found);

static void nfc_release(struct device *d)
{
	struct nfc_dev *dev = to_nfc_dev(d);

	nfc_dbg("dev_name=%s", dev_name(&dev->dev));

	nfc_genl_data_exit(&dev->genl_data);
	kfree(dev->targets);
	kfree(dev);
}

struct class nfc_class = {
	.name = "nfc",
	.dev_release = nfc_release,
};
EXPORT_SYMBOL(nfc_class);

static int match_idx(struct device *d, void *data)
{
	struct nfc_dev *dev = to_nfc_dev(d);
	unsigned *idx = data;

	return dev->idx == *idx;
}

struct nfc_dev *nfc_get_device(unsigned idx)
{
	struct device *d;

	d = class_find_device(&nfc_class, NULL, &idx, match_idx);
	if (!d)
		return NULL;

	return to_nfc_dev(d);
}

/**
 * nfc_allocate_device - allocate a new nfc device
 *
 * @ops: device operations
 * @supported_protocols: NFC protocols supported by the device
 */
struct nfc_dev *nfc_allocate_device(struct nfc_ops *ops,
					u32 supported_protocols,
					int tx_headroom,
					int tx_tailroom)
{
	static atomic_t dev_no = ATOMIC_INIT(0);
	struct nfc_dev *dev;

	if (!ops->start_poll || !ops->stop_poll || !ops->activate_target ||
		!ops->deactivate_target || !ops->data_exchange)
		return NULL;

	if (!supported_protocols)
		return NULL;

	dev = kzalloc(sizeof(struct nfc_dev), GFP_KERNEL);
	if (!dev)
		return NULL;

	dev->dev.class = &nfc_class;
	dev->idx = atomic_inc_return(&dev_no) - 1;
	dev_set_name(&dev->dev, "nfc%d", dev->idx);
	device_initialize(&dev->dev);

	dev->ops = ops;
	dev->supported_protocols = supported_protocols;
	dev->tx_headroom = tx_headroom;
	dev->tx_tailroom = tx_tailroom;

	spin_lock_init(&dev->targets_lock);
	nfc_genl_data_init(&dev->genl_data);

	/* first generation must not be 0 */
	dev->targets_generation = 1;

	return dev;
}
EXPORT_SYMBOL(nfc_allocate_device);

/**
 * nfc_register_device - register a nfc device in the nfc subsystem
 *
 * @dev: The nfc device to register
 */
int nfc_register_device(struct nfc_dev *dev)
{
	int rc;

	nfc_dbg("dev_name=%s", dev_name(&dev->dev));

	mutex_lock(&nfc_devlist_mutex);
	nfc_devlist_generation++;
	rc = device_add(&dev->dev);
	mutex_unlock(&nfc_devlist_mutex);

	if (rc < 0)
		return rc;

	rc = nfc_genl_device_added(dev);
	if (rc)
		nfc_dbg("The userspace won't be notified that the device %s was"
						" added", dev_name(&dev->dev));


	return 0;
}
EXPORT_SYMBOL(nfc_register_device);

/**
 * nfc_unregister_device - unregister a nfc device in the nfc subsystem
 *
 * @dev: The nfc device to unregister
 */
void nfc_unregister_device(struct nfc_dev *dev)
{
	int rc;

	nfc_dbg("dev_name=%s", dev_name(&dev->dev));

	mutex_lock(&nfc_devlist_mutex);
	nfc_devlist_generation++;

	/* lock to avoid unregistering a device while an operation
	   is in progress */
	device_lock(&dev->dev);
	device_del(&dev->dev);
	device_unlock(&dev->dev);

	mutex_unlock(&nfc_devlist_mutex);

	rc = nfc_genl_device_removed(dev);
	if (rc)
		nfc_dbg("The userspace won't be notified that the device %s"
					" was removed", dev_name(&dev->dev));

}
EXPORT_SYMBOL(nfc_unregister_device);

static int __init nfc_init(void)
{
	int rc;

	nfc_info("NFC Core ver %s", VERSION);

	rc = class_register(&nfc_class);
	if (rc)
		return rc;

	rc = nfc_genl_init();
	if (rc)
		goto err_genl;

	/* the first generation must not be 0 */
	nfc_devlist_generation = 1;

	rc = rawsock_init();
	if (rc)
		goto err_rawsock;

	rc = af_nfc_init();
	if (rc)
		goto err_af_nfc;

	return 0;

err_af_nfc:
	rawsock_exit();
err_rawsock:
	nfc_genl_exit();
err_genl:
	class_unregister(&nfc_class);
	return rc;
}

static void __exit nfc_exit(void)
{
	af_nfc_exit();
	rawsock_exit();
	nfc_genl_exit();
	class_unregister(&nfc_class);
}

subsys_initcall(nfc_init);
module_exit(nfc_exit);

MODULE_AUTHOR("Lauro Ramos Venancio <lauro.venancio@openbossa.org>");
MODULE_DESCRIPTION("NFC Core ver " VERSION);
MODULE_VERSION(VERSION);
MODULE_LICENSE("GPL");
Commit	Line	Data
3e256b8f LRV	1	/*
	2	* Copyright (C) 2011 Instituto Nokia de Tecnologia
	3	*
	4	* Authors:
	5	* Lauro Ramos Venancio <lauro.venancio@openbossa.org>
	6	* Aloisio Almeida Jr <aloisio.almeida@openbossa.org>
	7	*
	8	* This program is free software; you can redistribute it and/or modify
	9	* it under the terms of the GNU General Public License as published by
	10	* the Free Software Foundation; either version 2 of the License, or
	11	* (at your option) any later version.
	12	*
	13	* This program is distributed in the hope that it will be useful,
	14	* but WITHOUT ANY WARRANTY; without even the implied warranty of
	15	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	16	* GNU General Public License for more details.
	17	*
	18	* You should have received a copy of the GNU General Public License
	19	* along with this program; if not, write to the
	20	* Free Software Foundation, Inc.,
	21	* 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
	22	*/
	23
	24	#include <linux/init.h>
	25	#include <linux/kernel.h>
	26	#include <linux/module.h>
	27	#include <linux/slab.h>
	28
	29	#include "nfc.h"
	30
	31	#define VERSION "0.1"
	32
	33	int nfc_devlist_generation;
	34	DEFINE_MUTEX(nfc_devlist_mutex);
	35
	36	int nfc_printk(const char level, const char format, ...)
	37	{
	38	struct va_format vaf;
	39	va_list args;
	40	int r;
	41
	42	va_start(args, format);
	43
	44	vaf.fmt = format;
	45	vaf.va = &args;
	46
	47	r = printk("%sNFC: %pV\n", level, &vaf);
	48
	49	va_end(args);
	50
	51	return r;
	52	}
	53	EXPORT_SYMBOL(nfc_printk);
	54
	55	/**
	56	* nfc_start_poll - start polling for nfc targets
	57	*
	58	* @dev: The nfc device that must start polling
	59	* @protocols: bitset of nfc protocols that must be used for polling
	60	*
	61	* The device remains polling for targets until a target is found or
	62	* the nfc_stop_poll function is called.
	63	*/
	64	int nfc_start_poll(struct nfc_dev *dev, u32 protocols)
65	{
66	int rc;
67
68	nfc_dbg("dev_name=%s protocols=0x%x", dev_name(&dev->dev), protocols);
69
70	if (!protocols)
71	return -EINVAL;
72
73	device_lock(&dev->dev);
74
75	if (!device_is_registered(&dev->dev)) {
76	rc = -ENODEV;
77	goto error;
78	}
79
80	if (dev->polling) {
81	rc = -EBUSY;
82	goto error;
83	}
84
85	rc = dev->ops->start_poll(dev, protocols);
86	if (!rc)
87	dev->polling = true;
88
89	error:
90	device_unlock(&dev->dev);
91	return rc;
92	}
93
94	/**
95	* nfc_stop_poll - stop polling for nfc targets
96	*
97	* @dev: The nfc device that must stop polling
98	*/
99	int nfc_stop_poll(struct nfc_dev *dev)
100	{
101	int rc = 0;
102
103	nfc_dbg("dev_name=%s", dev_name(&dev->dev));
104
105	device_lock(&dev->dev);
106
107	if (!device_is_registered(&dev->dev)) {
108	rc = -ENODEV;
109	goto error;
110	}
111
112	if (!dev->polling) {
113	rc = -EINVAL;
114	goto error;
115	}
116
117	dev->ops->stop_poll(dev);
118	dev->polling = false;
119
120	error:
121	device_unlock(&dev->dev);
122	return rc;
123	}
124
125	/**
126	* nfc_activate_target - prepare the target for data exchange
127	*
128	* @dev: The nfc device that found the target
129	* @target_idx: index of the target that must be activated
130	* @protocol: nfc protocol that will be used for data exchange
131	*/
132	int nfc_activate_target(struct nfc_dev *dev, u32 target_idx, u32 protocol)
133	{
134	int rc;
135
136	nfc_dbg("dev_name=%s target_idx=%u protocol=%u", dev_name(&dev->dev),
137	target_idx, protocol);
138
139	device_lock(&dev->dev);
140
141	if (!device_is_registered(&dev->dev)) {
142	rc = -ENODEV;
143	goto error;
144	}
145
146	rc = dev->ops->activate_target(dev, target_idx, protocol);
147
148	error:
149	device_unlock(&dev->dev);
150	return rc;
151	}
152
153	/**
154	* nfc_deactivate_target - deactivate a nfc target
155	*
156	* @dev: The nfc device that found the target
157	* @target_idx: index of the target that must be deactivated
158	*/
159	int nfc_deactivate_target(struct nfc_dev *dev, u32 target_idx)
160	{
161	int rc = 0;
162
163	nfc_dbg("dev_name=%s target_idx=%u", dev_name(&dev->dev), target_idx);
164
165	device_lock(&dev->dev);
166
167	if (!device_is_registered(&dev->dev)) {
168	rc = -ENODEV;
169	goto error;
170	}
171
172	dev->ops->deactivate_target(dev, target_idx);
173
174	error:
175	device_unlock(&dev->dev);
176	return rc;
177	}
178
179	/**
180	* nfc_data_exchange - transceive data
181	*
182	* @dev: The nfc device that found the target
183	* @target_idx: index of the target
184	* @skb: data to be sent
185	* @cb: callback called when the response is received
186	* @cb_context: parameter for the callback function
187	*
188	* The user must wait for the callback before calling this function again.
189	*/
190	int nfc_data_exchange(struct nfc_dev *dev, u32 target_idx,
191	struct sk_buff *skb,
192	data_exchange_cb_t cb,
193	void *cb_context)
194	{
195	int rc;
196
197	nfc_dbg("dev_name=%s target_idx=%u skb->len=%u", dev_name(&dev->dev),
198	target_idx, skb->len);
199
200	device_lock(&dev->dev);
201
202	if (!device_is_registered(&dev->dev)) {
203	rc = -ENODEV;
204	kfree_skb(skb);
205	goto error;
206	}
207
208	rc = dev->ops->data_exchange(dev, target_idx, skb, cb, cb_context);
209
210	error:
211	device_unlock(&dev->dev);
212	return rc;
213	}
214
215	/**
216	* nfc_alloc_skb - allocate a skb for data exchange responses
217	*
218	* @size: size to allocate
219	* @gfp: gfp flags
220	*/
221	struct sk_buff *nfc_alloc_skb(unsigned int size, gfp_t gfp)
222	{
223	struct sk_buff *skb;
224	unsigned int total_size;
225
226	total_size = size + 1;
227	skb = alloc_skb(total_size, gfp);
228
229	if (skb)
230	skb_reserve(skb, 1);
231
232	return skb;
233	}
234	EXPORT_SYMBOL(nfc_alloc_skb);
235
4d12b8b1 LRV	236	/**
	237	* nfc_targets_found - inform that targets were found
	238	*
	239	* @dev: The nfc device that found the targets
	240	* @targets: array of nfc targets found
	241	* @ntargets: targets array size
	242	*
	243	* The device driver must call this function when one or many nfc targets
	244	* are found. After calling this function, the device driver must stop
	245	* polling for targets.
	246	*/
	247	int nfc_targets_found(struct nfc_dev dev, struct nfc_target targets,
	248	int n_targets)
	249	{
	250	int i;
	251
	252	nfc_dbg("dev_name=%s n_targets=%d", dev_name(&dev->dev), n_targets);
	253
	254	dev->polling = false;
	255
	256	for (i = 0; i < n_targets; i++)
	257	targets[i].idx = dev->target_idx++;
	258
	259	spin_lock_bh(&dev->targets_lock);
	260
	261	dev->targets_generation++;
	262
	263	kfree(dev->targets);
	264	dev->targets = kmemdup(targets, n_targets * sizeof(struct nfc_target),
	265	GFP_ATOMIC);
	266
	267	if (!dev->targets) {
	268	dev->n_targets = 0;
	269	spin_unlock_bh(&dev->targets_lock);
	270	return -ENOMEM;
	271	}
	272
	273	dev->n_targets = n_targets;
	274	spin_unlock_bh(&dev->targets_lock);
	275
	276	nfc_genl_targets_found(dev);
	277
	278	return 0;
	279	}
	280	EXPORT_SYMBOL(nfc_targets_found);
	281
3e256b8f LRV	282	static void nfc_release(struct device *d)
	283	{
	284	struct nfc_dev *dev = to_nfc_dev(d);
	285
	286	nfc_dbg("dev_name=%s", dev_name(&dev->dev));
	287
4d12b8b1 LRV	288	nfc_genl_data_exit(&dev->genl_data);
4d12b8b1 LRV	289	kfree(dev->targets);
3e256b8f LRV	290	kfree(dev);
	291	}
	292
	293	struct class nfc_class = {
	294	.name = "nfc",
	295	.dev_release = nfc_release,
	296	};
	297	EXPORT_SYMBOL(nfc_class);
	298
	299	static int match_idx(struct device d, void data)
	300	{
	301	struct nfc_dev *dev = to_nfc_dev(d);
	302	unsigned *idx = data;
	303
	304	return dev->idx == *idx;
	305	}
	306
	307	struct nfc_dev *nfc_get_device(unsigned idx)
	308	{
	309	struct device *d;
	310
	311	d = class_find_device(&nfc_class, NULL, &idx, match_idx);
	312	if (!d)
	313	return NULL;
	314
	315	return to_nfc_dev(d);
	316	}
	317
	318	/**
	319	* nfc_allocate_device - allocate a new nfc device
	320	*
	321	* @ops: device operations
	322	* @supported_protocols: NFC protocols supported by the device
	323	*/
	324	struct nfc_dev nfc_allocate_device(struct nfc_ops ops,
e8753043 SO	325	u32 supported_protocols,
	326	int tx_headroom,
	327	int tx_tailroom)
3e256b8f LRV	328	{
	329	static atomic_t dev_no = ATOMIC_INIT(0);
	330	struct nfc_dev *dev;
	331
	332	if (!ops->start_poll \|\| !ops->stop_poll \|\| !ops->activate_target \|\|
	333	!ops->deactivate_target \|\| !ops->data_exchange)
	334	return NULL;
	335
	336	if (!supported_protocols)
	337	return NULL;
	338
	339	dev = kzalloc(sizeof(struct nfc_dev), GFP_KERNEL);
	340	if (!dev)
	341	return NULL;
	342
	343	dev->dev.class = &nfc_class;
	344	dev->idx = atomic_inc_return(&dev_no) - 1;
	345	dev_set_name(&dev->dev, "nfc%d", dev->idx);
	346	device_initialize(&dev->dev);
	347
	348	dev->ops = ops;
	349	dev->supported_protocols = supported_protocols;
e8753043 SO	350	dev->tx_headroom = tx_headroom;
e8753043 SO	351	dev->tx_tailroom = tx_tailroom;
3e256b8f	352
4d12b8b1 LRV	353	spin_lock_init(&dev->targets_lock);
	354	nfc_genl_data_init(&dev->genl_data);
	355
	356	/* first generation must not be 0 */
	357	dev->targets_generation = 1;
	358
3e256b8f LRV	359	return dev;
	360	}
	361	EXPORT_SYMBOL(nfc_allocate_device);
	362
	363	/**
	364	* nfc_register_device - register a nfc device in the nfc subsystem
	365	*
	366	* @dev: The nfc device to register
	367	*/
	368	int nfc_register_device(struct nfc_dev *dev)
	369	{
	370	int rc;
	371
	372	nfc_dbg("dev_name=%s", dev_name(&dev->dev));
	373
	374	mutex_lock(&nfc_devlist_mutex);
	375	nfc_devlist_generation++;
	376	rc = device_add(&dev->dev);
	377	mutex_unlock(&nfc_devlist_mutex);
	378
4d12b8b1 LRV	379	if (rc < 0)
	380	return rc;
	381
	382	rc = nfc_genl_device_added(dev);
	383	if (rc)
	384	nfc_dbg("The userspace won't be notified that the device %s was"
	385	" added", dev_name(&dev->dev));
	386
	387
	388	return 0;
3e256b8f LRV	389	}
	390	EXPORT_SYMBOL(nfc_register_device);
	391
	392	/**
	393	* nfc_unregister_device - unregister a nfc device in the nfc subsystem
	394	*
	395	* @dev: The nfc device to unregister
	396	*/
	397	void nfc_unregister_device(struct nfc_dev *dev)
	398	{
4d12b8b1 LRV	399	int rc;
4d12b8b1 LRV	400
3e256b8f LRV	401	nfc_dbg("dev_name=%s", dev_name(&dev->dev));
	402
	403	mutex_lock(&nfc_devlist_mutex);
	404	nfc_devlist_generation++;
	405
	406	/* lock to avoid unregistering a device while an operation
	407	is in progress */
	408	device_lock(&dev->dev);
	409	device_del(&dev->dev);
	410	device_unlock(&dev->dev);
	411
	412	mutex_unlock(&nfc_devlist_mutex);
4d12b8b1 LRV	413
	414	rc = nfc_genl_device_removed(dev);
	415	if (rc)
	416	nfc_dbg("The userspace won't be notified that the device %s"
	417	" was removed", dev_name(&dev->dev));
	418
3e256b8f LRV	419	}
	420	EXPORT_SYMBOL(nfc_unregister_device);
	421
	422	static int __init nfc_init(void)
	423	{
4d12b8b1 LRV	424	int rc;
4d12b8b1 LRV	425
3e256b8f LRV	426	nfc_info("NFC Core ver %s", VERSION);
3e256b8f LRV	427
4d12b8b1 LRV	428	rc = class_register(&nfc_class);
	429	if (rc)
	430	return rc;
	431
	432	rc = nfc_genl_init();
	433	if (rc)
	434	goto err_genl;
	435
	436	/* the first generation must not be 0 */
	437	nfc_devlist_generation = 1;
	438
23b7869c LRV	439	rc = rawsock_init();
	440	if (rc)
	441	goto err_rawsock;
	442
c7fe3b52 AAJ	443	rc = af_nfc_init();
	444	if (rc)
	445	goto err_af_nfc;
	446
4d12b8b1 LRV	447	return 0;
4d12b8b1 LRV	448
c7fe3b52	449	err_af_nfc:
23b7869c LRV	450	rawsock_exit();
23b7869c LRV	451	err_rawsock:
c7fe3b52	452	nfc_genl_exit();
4d12b8b1 LRV	453	err_genl:
	454	class_unregister(&nfc_class);
	455	return rc;
3e256b8f LRV	456	}
	457
	458	static void __exit nfc_exit(void)
	459	{
c7fe3b52	460	af_nfc_exit();
23b7869c	461	rawsock_exit();
4d12b8b1	462	nfc_genl_exit();
3e256b8f LRV	463	class_unregister(&nfc_class);
	464	}
	465
	466	subsys_initcall(nfc_init);
	467	module_exit(nfc_exit);
	468
	469	MODULE_AUTHOR("Lauro Ramos Venancio <lauro.venancio@openbossa.org>");
	470	MODULE_DESCRIPTION("NFC Core ver " VERSION);
	471	MODULE_VERSION(VERSION);
	472	MODULE_LICENSE("GPL");