ubuntu-linux-kernel/drivers/nfc/nxp-nci/core.c

/*
 * Generic driver for NXP NCI NFC chips
 *
 * Copyright (C) 2014  NXP Semiconductors  All rights reserved.
 *
 * Authors: Clément Perrochaud <clement.perrochaud@nxp.com>
 *
 * Derived from PN544 device driver:
 * Copyright (C) 2012  Intel Corporation. All rights reserved.
 *
 * This program is free software; you can redistribute it and/or modify it
 * under the terms and conditions of the GNU General Public License,
 * version 2, as published by the Free Software Foundation.
 *
 * 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, see <http://www.gnu.org/licenses/>.
 */

#include <linux/delay.h>
#include <linux/gpio.h>
#include <linux/module.h>
#include <linux/nfc.h>
#include <linux/platform_data/nxp-nci.h>

#include <net/nfc/nci_core.h>

#include "nxp-nci.h"

#define NXP_NCI_HDR_LEN	4

#define NXP_NCI_NFC_PROTOCOLS (NFC_PROTO_JEWEL_MASK | \
			       NFC_PROTO_MIFARE_MASK | \
			       NFC_PROTO_FELICA_MASK | \
			       NFC_PROTO_ISO14443_MASK | \
			       NFC_PROTO_ISO14443_B_MASK | \
			       NFC_PROTO_NFC_DEP_MASK)

static int nxp_nci_open(struct nci_dev *ndev)
{
	struct nxp_nci_info *info = nci_get_drvdata(ndev);
	int r = 0;

	mutex_lock(&info->info_lock);

	if (info->mode != NXP_NCI_MODE_COLD) {
		r = -EBUSY;
		goto open_exit;
	}

	if (info->phy_ops->set_mode)
		r = info->phy_ops->set_mode(info->phy_id, NXP_NCI_MODE_NCI);

	info->mode = NXP_NCI_MODE_NCI;

open_exit:
	mutex_unlock(&info->info_lock);
	return r;
}

static int nxp_nci_close(struct nci_dev *ndev)
{
	struct nxp_nci_info *info = nci_get_drvdata(ndev);
	int r = 0;

	mutex_lock(&info->info_lock);

	if (info->phy_ops->set_mode)
		r = info->phy_ops->set_mode(info->phy_id, NXP_NCI_MODE_COLD);

	info->mode = NXP_NCI_MODE_COLD;

	mutex_unlock(&info->info_lock);
	return r;
}

static int nxp_nci_send(struct nci_dev *ndev, struct sk_buff *skb)
{
	struct nxp_nci_info *info = nci_get_drvdata(ndev);
	int r;

	if (!info->phy_ops->write) {
		r = -ENOTSUPP;
		goto send_exit;
	}

	if (info->mode != NXP_NCI_MODE_NCI) {
		r = -EINVAL;
		goto send_exit;
	}

	r = info->phy_ops->write(info->phy_id, skb);
	if (r < 0)
		kfree_skb(skb);

send_exit:
	return r;
}

static struct nci_ops nxp_nci_ops = {
	.open = nxp_nci_open,
	.close = nxp_nci_close,
	.send = nxp_nci_send,
	.fw_download = nxp_nci_fw_download,
};

int nxp_nci_probe(void *phy_id, struct device *pdev,
		  const struct nxp_nci_phy_ops *phy_ops,
		  unsigned int max_payload,
		  struct nci_dev **ndev)
{
	struct nxp_nci_info *info;
	int r;

	info = devm_kzalloc(pdev, sizeof(struct nxp_nci_info), GFP_KERNEL);
	if (!info) {
		r = -ENOMEM;
		goto probe_exit;
	}

	info->phy_id = phy_id;
	info->pdev = pdev;
	info->phy_ops = phy_ops;
	info->max_payload = max_payload;
	INIT_WORK(&info->fw_info.work, nxp_nci_fw_work);
	init_completion(&info->fw_info.cmd_completion);
	mutex_init(&info->info_lock);

	if (info->phy_ops->set_mode) {
		r = info->phy_ops->set_mode(info->phy_id, NXP_NCI_MODE_COLD);
		if (r < 0)
			goto probe_exit;
	}

	info->mode = NXP_NCI_MODE_COLD;

	info->ndev = nci_allocate_device(&nxp_nci_ops, NXP_NCI_NFC_PROTOCOLS,
					 NXP_NCI_HDR_LEN, 0);
	if (!info->ndev) {
		r = -ENOMEM;
		goto probe_exit;
	}

	nci_set_parent_dev(info->ndev, pdev);
	nci_set_drvdata(info->ndev, info);
	r = nci_register_device(info->ndev);
	if (r < 0)
		goto probe_exit_free_nci;

	*ndev = info->ndev;

	goto probe_exit;

probe_exit_free_nci:
	nci_free_device(info->ndev);
probe_exit:
	return r;
}
EXPORT_SYMBOL(nxp_nci_probe);

void nxp_nci_remove(struct nci_dev *ndev)
{
	struct nxp_nci_info *info = nci_get_drvdata(ndev);

	if (info->mode == NXP_NCI_MODE_FW)
		nxp_nci_fw_work_complete(info, -ESHUTDOWN);
	cancel_work_sync(&info->fw_info.work);

	mutex_lock(&info->info_lock);

	if (info->phy_ops->set_mode)
		info->phy_ops->set_mode(info->phy_id, NXP_NCI_MODE_COLD);

	nci_unregister_device(ndev);
	nci_free_device(ndev);

	mutex_unlock(&info->info_lock);
}
EXPORT_SYMBOL(nxp_nci_remove);

MODULE_LICENSE("GPL");
MODULE_DESCRIPTION("NXP NCI NFC driver");
MODULE_AUTHOR("Clément Perrochaud <clement.perrochaud@nxp.com>");