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// SPDX-License-Identifier: GPL-2.0-or-later
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/*
 * Copyright (C) 2011 Instituto Nokia de Tecnologia
 *
 * Authors:
 *    Lauro Ramos Venancio <lauro.venancio@openbossa.org>
 *    Aloisio Almeida Jr <aloisio.almeida@openbossa.org>
 */

#define pr_fmt(fmt) KBUILD_MODNAME ": %s: " fmt, __func__

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

#include <net/genetlink.h>

#include "nfc.h"

#define VERSION "0.1"

#define NFC_CHECK_PRES_FREQ_MS	2000

int nfc_devlist_generation;
DEFINE_MUTEX(nfc_devlist_mutex);

/* NFC device ID bitmap */
static DEFINE_IDA(nfc_index_ida);

int nfc_fw_download(struct nfc_dev *dev, const char *firmware_name)
{
	int rc = 0;

	pr_debug("%s do firmware %s\n", dev_name(&dev->dev), firmware_name);

	device_lock(&dev->dev);

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

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

	if (!dev->ops->fw_download) {
		rc = -EOPNOTSUPP;
		goto error;
	}

	dev->fw_download_in_progress = true;
	rc = dev->ops->fw_download(dev, firmware_name);
	if (rc)
		dev->fw_download_in_progress = false;

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

/**
 * nfc_fw_download_done - inform that a firmware download was completed
 *
 * @dev: The nfc device to which firmware was downloaded
 * @firmware_name: The firmware filename
 * @result: The positive value of a standard errno value
 */
int nfc_fw_download_done(struct nfc_dev *dev, const char *firmware_name,
			 u32 result)
{
	dev->fw_download_in_progress = false;

	return nfc_genl_fw_download_done(dev, firmware_name, result);
}
EXPORT_SYMBOL(nfc_fw_download_done);

/**
 * nfc_dev_up - turn on the NFC device
 *
 * @dev: The nfc device to be turned on
 *
 * The device remains up until the nfc_dev_down function is called.
 */
int nfc_dev_up(struct nfc_dev *dev)
{
	int rc = 0;

	pr_debug("dev_name=%s\n", dev_name(&dev->dev));

	device_lock(&dev->dev);

	if (dev->rfkill && rfkill_blocked(dev->rfkill)) {
		rc = -ERFKILL;
		goto error;
	}

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

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

	if (dev->dev_up) {
		rc = -EALREADY;
		goto error;
	}

	if (dev->ops->dev_up)
		rc = dev->ops->dev_up(dev);

	if (!rc)
		dev->dev_up = true;

	/* We have to enable the device before discovering SEs */
	if (dev->ops->discover_se && dev->ops->discover_se(dev))
		pr_err("SE discovery failed\n");

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

/**
 * nfc_dev_down - turn off the NFC device
 *
 * @dev: The nfc device to be turned off
 */
int nfc_dev_down(struct nfc_dev *dev)
{
	int rc = 0;

	pr_debug("dev_name=%s\n", dev_name(&dev->dev));

	device_lock(&dev->dev);

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

	if (!dev->dev_up) {
		rc = -EALREADY;
		goto error;
	}

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

	if (dev->ops->dev_down)
		dev->ops->dev_down(dev);

	dev->dev_up = false;

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

static int nfc_rfkill_set_block(void *data, bool blocked)
{
	struct nfc_dev *dev = data;

	pr_debug("%s blocked %d", dev_name(&dev->dev), blocked);

	if (!blocked)
		return 0;

	nfc_dev_down(dev);

	return 0;
}

static const struct rfkill_ops nfc_rfkill_ops = {
	.set_block = nfc_rfkill_set_block,
};

/**
 * 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 im_protocols, u32 tm_protocols)
{
	int rc;

	pr_debug("dev_name %s initiator protocols 0x%x target protocols 0x%x\n",
		 dev_name(&dev->dev), im_protocols, tm_protocols);

	if (!im_protocols && !tm_protocols)
		return -EINVAL;

	device_lock(&dev->dev);

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

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

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

	rc = dev->ops->start_poll(dev, im_protocols, tm_protocols);
	if (!rc) {
		dev->polling = true;
		dev->rf_mode = NFC_RF_NONE;
	}

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;

	pr_debug("dev_name=%s\n", 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;
	dev->rf_mode = NFC_RF_NONE;

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

static struct nfc_target *nfc_find_target(struct nfc_dev *dev, u32 target_idx)
{
	int i;

	for (i = 0; i < dev->n_targets; i++) {
		if (dev->targets[i].idx == target_idx)
			return &dev->targets[i];
	}

	return NULL;
}

int nfc_dep_link_up(struct nfc_dev *dev, int target_index, u8 comm_mode)
{
	int rc = 0;
	u8 *gb;
	size_t gb_len;
	struct nfc_target *target;

	pr_debug("dev_name=%s comm %d\n", dev_name(&dev->dev), comm_mode);

	if (!dev->ops->dep_link_up)
		return -EOPNOTSUPP;

	device_lock(&dev->dev);

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

	if (dev->dep_link_up == true) {
		rc = -EALREADY;
		goto error;
	}

	gb = nfc_llcp_general_bytes(dev, &gb_len);
	if (gb_len > NFC_MAX_GT_LEN) {
		rc = -EINVAL;
		goto error;
	}

	target = nfc_find_target(dev, target_index);
	if (target == NULL) {
		rc = -ENOTCONN;
		goto error;
	}

	rc = dev->ops->dep_link_up(dev, target, comm_mode, gb, gb_len);
	if (!rc) {
		dev->active_target = target;
		dev->rf_mode = NFC_RF_INITIATOR;
	}

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

int nfc_dep_link_down(struct nfc_dev *dev)
{
	int rc = 0;

	pr_debug("dev_name=%s\n", dev_name(&dev->dev));

	if (!dev->ops->dep_link_down)
		return -EOPNOTSUPP;

	device_lock(&dev->dev);

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

	if (dev->dep_link_up == false) {
		rc = -EALREADY;
		goto error;
	}

	rc = dev->ops->dep_link_down(dev);
	if (!rc) {
		dev->dep_link_up = false;
		dev->active_target = NULL;
		dev->rf_mode = NFC_RF_NONE;
		nfc_llcp_mac_is_down(dev);
		nfc_genl_dep_link_down_event(dev);
	}

error:
	device_unlock(&dev->dev);

	return rc;
}

int nfc_dep_link_is_up(struct nfc_dev *dev, u32 target_idx,
		       u8 comm_mode, u8 rf_mode)
{
	dev->dep_link_up = true;

	if (!dev->active_target && rf_mode == NFC_RF_INITIATOR) {
		struct nfc_target *target;

		target = nfc_find_target(dev, target_idx);
		if (target == NULL)
			return -ENOTCONN;

		dev->active_target = target;
	}

	dev->polling = false;
	dev->rf_mode = rf_mode;

	nfc_llcp_mac_is_up(dev, target_idx, comm_mode, rf_mode);

	return nfc_genl_dep_link_up_event(dev, target_idx, comm_mode, rf_mode);
}
EXPORT_SYMBOL(nfc_dep_link_is_up);

/**
 * 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;
	struct nfc_target *target;

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

	device_lock(&dev->dev);

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

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

	target = nfc_find_target(dev, target_idx);
	if (target == NULL) {
		rc = -ENOTCONN;
		goto error;
	}

	rc = dev->ops->activate_target(dev, target, protocol);
	if (!rc) {
		dev->active_target = target;
		dev->rf_mode = NFC_RF_INITIATOR;

		if (dev->ops->check_presence && !dev->shutting_down)
			mod_timer(&dev->check_pres_timer, jiffies +
				  msecs_to_jiffies(NFC_CHECK_PRES_FREQ_MS));
	}

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, u8 mode)
{
	int rc = 0;

	pr_debug("dev_name=%s target_idx=%u\n",
		 dev_name(&dev->dev), target_idx);

	device_lock(&dev->dev);

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

	if (dev->active_target == NULL) {
		rc = -ENOTCONN;
		goto error;
	}

	if (dev->active_target->idx != target_idx) {
		rc = -ENOTCONN;
		goto error;
	}

	if (dev->ops->check_presence)
		del_timer_sync(&dev->check_pres_timer);

	dev->ops->deactivate_target(dev, dev->active_target, mode);
	dev->active_target = NULL;

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;

	pr_debug("dev_name=%s target_idx=%u skb->len=%u\n",
		 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;
	}

	if (dev->rf_mode == NFC_RF_INITIATOR && dev->active_target != NULL) {
		if (dev->active_target->idx != target_idx) {
			rc = -EADDRNOTAVAIL;
			kfree_skb(skb);
			goto error;
		}

		if (dev->ops->check_presence)
			del_timer_sync(&dev->check_pres_timer);

		rc = dev->ops->im_transceive(dev, dev->active_target, skb, cb,
					     cb_context);

		if (!rc && dev->ops->check_presence && !dev->shutting_down)
			mod_timer(&dev->check_pres_timer, jiffies +
				  msecs_to_jiffies(NFC_CHECK_PRES_FREQ_MS));
	} else if (dev->rf_mode == NFC_RF_TARGET && dev->ops->tm_send != NULL) {
		rc = dev->ops->tm_send(dev, skb);
	} else {
		rc = -ENOTCONN;
		kfree_skb(skb);
		goto error;
	}


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

struct nfc_se *nfc_find_se(struct nfc_dev *dev, u32 se_idx)
{
	struct nfc_se *se;

	list_for_each_entry(se, &dev->secure_elements, list)
		if (se->idx == se_idx)
			return se;

	return NULL;
}
EXPORT_SYMBOL(nfc_find_se);

int nfc_enable_se(struct nfc_dev *dev, u32 se_idx)
{
	struct nfc_se *se;
	int rc;

	pr_debug("%s se index %d\n", dev_name(&dev->dev), se_idx);

	device_lock(&dev->dev);

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

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

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

	if (!dev->ops->enable_se || !dev->ops->disable_se) {
		rc = -EOPNOTSUPP;
		goto error;
	}

	se = nfc_find_se(dev, se_idx);
	if (!se) {
		rc = -EINVAL;
		goto error;
	}

	if (se->state == NFC_SE_ENABLED) {
		rc = -EALREADY;
		goto error;
	}

	rc = dev->ops->enable_se(dev, se_idx);
	if (rc >= 0)
		se->state = NFC_SE_ENABLED;

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

int nfc_disable_se(struct nfc_dev *dev, u32 se_idx)
{
	struct nfc_se *se;
	int rc;

	pr_debug("%s se index %d\n", dev_name(&dev->dev), se_idx);

	device_lock(&dev->dev);

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

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

	if (!dev->ops->enable_se || !dev->ops->disable_se) {
		rc = -EOPNOTSUPP;
		goto error;
	}

	se = nfc_find_se(dev, se_idx);
	if (!se) {
		rc = -EINVAL;
		goto error;
	}

	if (se->state == NFC_SE_DISABLED) {
		rc = -EALREADY;
		goto error;
	}

	rc = dev->ops->disable_se(dev, se_idx);
	if (rc >= 0)
		se->state = NFC_SE_DISABLED;

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

int nfc_set_remote_general_bytes(struct nfc_dev *dev, u8 *gb, u8 gb_len)
{
	pr_debug("dev_name=%s gb_len=%d\n", dev_name(&dev->dev), gb_len);

	return nfc_llcp_set_remote_gb(dev, gb, gb_len);
}
EXPORT_SYMBOL(nfc_set_remote_general_bytes);

u8 *nfc_get_local_general_bytes(struct nfc_dev *dev, size_t *gb_len)
{
	pr_debug("dev_name=%s\n", dev_name(&dev->dev));

	return nfc_llcp_general_bytes(dev, gb_len);
}
EXPORT_SYMBOL(nfc_get_local_general_bytes);

int nfc_tm_data_received(struct nfc_dev *dev, struct sk_buff *skb)
{
	/* Only LLCP target mode for now */
	if (dev->dep_link_up == false) {
		kfree_skb(skb);
		return -ENOLINK;
	}

	return nfc_llcp_data_received(dev, skb);
}
EXPORT_SYMBOL(nfc_tm_data_received);

int nfc_tm_activated(struct nfc_dev *dev, u32 protocol, u8 comm_mode,
		     u8 *gb, size_t gb_len)
{
	int rc;

	device_lock(&dev->dev);

	dev->polling = false;

	if (gb != NULL) {
		rc = nfc_set_remote_general_bytes(dev, gb, gb_len);
		if (rc < 0)
			goto out;
	}

	dev->rf_mode = NFC_RF_TARGET;

	if (protocol == NFC_PROTO_NFC_DEP_MASK)
		nfc_dep_link_is_up(dev, 0, comm_mode, NFC_RF_TARGET);

	rc = nfc_genl_tm_activated(dev, protocol);

out:
	device_unlock(&dev->dev);

	return rc;
}
EXPORT_SYMBOL(nfc_tm_activated);

int nfc_tm_deactivated(struct nfc_dev *dev)
{
	dev->dep_link_up = false;
	dev->rf_mode = NFC_RF_NONE;

	return nfc_genl_tm_deactivated(dev);
}
EXPORT_SYMBOL(nfc_tm_deactivated);

/**
 * nfc_alloc_send_skb - allocate a skb for data exchange responses
 *
 * @size: size to allocate
 * @gfp: gfp flags
 */
struct sk_buff *nfc_alloc_send_skb(struct nfc_dev *dev, struct sock *sk,
				   unsigned int flags, unsigned int size,
				   unsigned int *err)
{
	struct sk_buff *skb;
	unsigned int total_size;

	total_size = size +
		dev->tx_headroom + dev->tx_tailroom + NFC_HEADER_SIZE;

	skb = sock_alloc_send_skb(sk, total_size, flags & MSG_DONTWAIT, err);
	if (skb)
		skb_reserve(skb, dev->tx_headroom + NFC_HEADER_SIZE);

	return skb;
}

/**
 * nfc_alloc_recv_skb - allocate a skb for data exchange responses
 *
 * @size: size to allocate
 * @gfp: gfp flags
 */
struct sk_buff *nfc_alloc_recv_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_recv_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.
 * NOTE: This function can be called with targets=NULL and n_targets=0 to
 * notify a driver error, meaning that the polling operation cannot complete.
 * IMPORTANT: this function must not be called from an atomic context.
 * In addition, it must also not be called from a context that would prevent
 * the NFC Core to call other nfc ops entry point concurrently.
 */
int nfc_targets_found(struct nfc_dev *dev,
		      struct nfc_target *targets, int n_targets)
{
	int i;

	pr_debug("dev_name=%s n_targets=%d\n", dev_name(&dev->dev), n_targets);

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

	device_lock(&dev->dev);

	if (dev->polling == false) {
		device_unlock(&dev->dev);
		return 0;
	}

	dev->polling = false;

	dev->targets_generation++;

	kfree(dev->targets);
	dev->targets = NULL;

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

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

	dev->n_targets = n_targets;
	device_unlock(&dev->dev);

	nfc_genl_targets_found(dev);

	return 0;
}
EXPORT_SYMBOL(nfc_targets_found);

/**
 * nfc_target_lost - inform that an activated target went out of field
 *
 * @dev: The nfc device that had the activated target in field
 * @target_idx: the nfc index of the target
 *
 * The device driver must call this function when the activated target
 * goes out of the field.
 * IMPORTANT: this function must not be called from an atomic context.
 * In addition, it must also not be called from a context that would prevent
 * the NFC Core to call other nfc ops entry point concurrently.
 */
int nfc_target_lost(struct nfc_dev *dev, u32 target_idx)
{
	struct nfc_target *tg;
	int i;

	pr_debug("dev_name %s n_target %d\n", dev_name(&dev->dev), target_idx);

	device_lock(&dev->dev);

	for (i = 0; i < dev->n_targets; i++) {
		tg = &dev->targets[i];
		if (tg->idx == target_idx)
			break;
	}

	if (i == dev->n_targets) {
		device_unlock(&dev->dev);
		return -EINVAL;
	}

	dev->targets_generation++;
	dev->n_targets--;
	dev->active_target = NULL;

	if (dev->n_targets) {
		memcpy(&dev->targets[i], &dev->targets[i + 1],
		       (dev->n_targets - i) * sizeof(struct nfc_target));
	} else {
		kfree(dev->targets);
		dev->targets = NULL;
	}

	device_unlock(&dev->dev);

	nfc_genl_target_lost(dev, target_idx);

	return 0;
}
EXPORT_SYMBOL(nfc_target_lost);

inline void nfc_driver_failure(struct nfc_dev *dev, int err)
{
	nfc_targets_found(dev, NULL, 0);
}
EXPORT_SYMBOL(nfc_driver_failure);

int nfc_add_se(struct nfc_dev *dev, u32 se_idx, u16 type)
{
	struct nfc_se *se;
	int rc;

	pr_debug("%s se index %d\n", dev_name(&dev->dev), se_idx);

	se = nfc_find_se(dev, se_idx);
	if (se)
		return -EALREADY;

	se = kzalloc(sizeof(struct nfc_se), GFP_KERNEL);
	if (!se)
		return -ENOMEM;

	se->idx = se_idx;
	se->type = type;
	se->state = NFC_SE_DISABLED;
	INIT_LIST_HEAD(&se->list);

	list_add(&se->list, &dev->secure_elements);

	rc = nfc_genl_se_added(dev, se_idx, type);
	if (rc < 0) {
		list_del(&se->list);
		kfree(se);

		return rc;
	}

	return 0;
}
EXPORT_SYMBOL(nfc_add_se);

int nfc_remove_se(struct nfc_dev *dev, u32 se_idx)
{
	struct nfc_se *se, *n;
	int rc;

	pr_debug("%s se index %d\n", dev_name(&dev->dev), se_idx);

	list_for_each_entry_safe(se, n, &dev->secure_elements, list)
		if (se->idx == se_idx) {
			rc = nfc_genl_se_removed(dev, se_idx);
			if (rc < 0)
				return rc;

			list_del(&se->list);
			kfree(se);

			return 0;
		}

	return -EINVAL;
}
EXPORT_SYMBOL(nfc_remove_se);

int nfc_se_transaction(struct nfc_dev *dev, u8 se_idx,
		       struct nfc_evt_transaction *evt_transaction)
{
	int rc;

	pr_debug("transaction: %x\n", se_idx);

	device_lock(&dev->dev);

	if (!evt_transaction) {
		rc = -EPROTO;
		goto out;
	}

	rc = nfc_genl_se_transaction(dev, se_idx, evt_transaction);
out:
	device_unlock(&dev->dev);
	return rc;
}
EXPORT_SYMBOL(nfc_se_transaction);

int nfc_se_connectivity(struct nfc_dev *dev, u8 se_idx)
{
	int rc;

	pr_debug("connectivity: %x\n", se_idx);

	device_lock(&dev->dev);
	rc = nfc_genl_se_connectivity(dev, se_idx);
	device_unlock(&dev->dev);
	return rc;
}
EXPORT_SYMBOL(nfc_se_connectivity);

static void nfc_release(struct device *d)
{
	struct nfc_dev *dev = to_nfc_dev(d);
	struct nfc_se *se, *n;

	pr_debug("dev_name=%s\n", dev_name(&dev->dev));

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

	list_for_each_entry_safe(se, n, &dev->secure_elements, list) {
			nfc_genl_se_removed(dev, se->idx);
			list_del(&se->list);
			kfree(se);
	}

973 974
	ida_simple_remove(&nfc_index_ida, dev->idx);

975 976 977 978 979 980 981 982 983 984 985 986 987 988 989 990 991 992 993 994 995 996 997 998 999 1000 1001 1002 1003 1004 1005
	kfree(dev);
}

static void nfc_check_pres_work(struct work_struct *work)
{
	struct nfc_dev *dev = container_of(work, struct nfc_dev,
					   check_pres_work);
	int rc;

	device_lock(&dev->dev);

	if (dev->active_target && timer_pending(&dev->check_pres_timer) == 0) {
		rc = dev->ops->check_presence(dev, dev->active_target);
		if (rc == -EOPNOTSUPP)
			goto exit;
		if (rc) {
			u32 active_target_idx = dev->active_target->idx;
			device_unlock(&dev->dev);
			nfc_target_lost(dev, active_target_idx);
			return;
		}

		if (!dev->shutting_down)
			mod_timer(&dev->check_pres_timer, jiffies +
				  msecs_to_jiffies(NFC_CHECK_PRES_FREQ_MS));
	}

exit:
	device_unlock(&dev->dev);
}

1006
static void nfc_check_pres_timeout(struct timer_list *t)
1007
{
1008
	struct nfc_dev *dev = from_timer(dev, t, check_pres_timer);
1009 1010 1011 1012 1013 1014 1015 1016 1017 1018 1019 1020 1021 1022 1023 1024 1025 1026 1027 1028 1029 1030 1031 1032 1033 1034 1035 1036 1037 1038 1039 1040 1041 1042 1043 1044 1045 1046 1047 1048

	schedule_work(&dev->check_pres_work);
}

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

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

	return dev->idx == *idx;
}

struct nfc_dev *nfc_get_device(unsigned int 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)
{
	struct nfc_dev *dev;
1049
	int rc;
1050 1051 1052 1053 1054 1055 1056 1057 1058 1059 1060 1061

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

	if (!supported_protocols)
		return NULL;

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

1062 1063 1064 1065 1066 1067 1068 1069 1070
	rc = ida_simple_get(&nfc_index_ida, 0, 0, GFP_KERNEL);
	if (rc < 0)
		goto err_free_dev;
	dev->idx = rc;

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

1071 1072 1073 1074 1075 1076 1077 1078 1079 1080 1081 1082 1083 1084
	dev->ops = ops;
	dev->supported_protocols = supported_protocols;
	dev->tx_headroom = tx_headroom;
	dev->tx_tailroom = tx_tailroom;
	INIT_LIST_HEAD(&dev->secure_elements);

	nfc_genl_data_init(&dev->genl_data);

	dev->rf_mode = NFC_RF_NONE;

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

	if (ops->check_presence) {
1085
		timer_setup(&dev->check_pres_timer, nfc_check_pres_timeout, 0);
1086 1087 1088 1089
		INIT_WORK(&dev->check_pres_work, nfc_check_pres_work);
	}

	return dev;
1090 1091 1092 1093

err_free_dev:
	kfree(dev);

1094
	return NULL;
1095 1096 1097 1098 1099 1100 1101 1102 1103 1104 1105 1106 1107 1108 1109 1110 1111 1112 1113 1114 1115 1116 1117 1118 1119 1120 1121 1122 1123 1124 1125 1126 1127 1128 1129 1130 1131 1132 1133 1134 1135 1136 1137 1138 1139 1140 1141 1142 1143 1144 1145
}
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;

	pr_debug("dev_name=%s\n", 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_llcp_register_device(dev);
	if (rc)
		pr_err("Could not register llcp device\n");

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

	dev->rfkill = rfkill_alloc(dev_name(&dev->dev), &dev->dev,
				   RFKILL_TYPE_NFC, &nfc_rfkill_ops, dev);
	if (dev->rfkill) {
		if (rfkill_register(dev->rfkill) < 0) {
			rfkill_destroy(dev->rfkill);
			dev->rfkill = NULL;
		}
	}

	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)
{
1146
	int rc;
1147 1148 1149 1150 1151 1152 1153 1154 1155 1156 1157 1158 1159 1160 1161 1162 1163 1164 1165 1166 1167 1168 1169 1170 1171 1172 1173 1174 1175 1176 1177 1178 1179 1180 1181 1182 1183 1184 1185 1186 1187 1188 1189 1190 1191 1192 1193 1194 1195 1196 1197 1198 1199 1200 1201 1202 1203 1204 1205 1206 1207 1208 1209 1210 1211 1212 1213 1214 1215 1216 1217 1218 1219 1220 1221 1222 1223 1224 1225 1226 1227 1228 1229 1230 1231 1232 1233 1234 1235 1236

	pr_debug("dev_name=%s\n", dev_name(&dev->dev));

	if (dev->rfkill) {
		rfkill_unregister(dev->rfkill);
		rfkill_destroy(dev->rfkill);
	}

	if (dev->ops->check_presence) {
		device_lock(&dev->dev);
		dev->shutting_down = true;
		device_unlock(&dev->dev);
		del_timer_sync(&dev->check_pres_timer);
		cancel_work_sync(&dev->check_pres_work);
	}

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

	nfc_llcp_unregister_device(dev);

	mutex_lock(&nfc_devlist_mutex);
	nfc_devlist_generation++;
	device_del(&dev->dev);
	mutex_unlock(&nfc_devlist_mutex);
}
EXPORT_SYMBOL(nfc_unregister_device);

static int __init nfc_init(void)
{
	int rc;

	pr_info("NFC Core ver %s\n", 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 = nfc_llcp_init();
	if (rc)
		goto err_llcp_sock;

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

	return 0;

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

static void __exit nfc_exit(void)
{
	af_nfc_exit();
	nfc_llcp_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");
MODULE_ALIAS_NETPROTO(PF_NFC);
MODULE_ALIAS_GENL_FAMILY(NFC_GENL_NAME);