188 lines
4.3 KiB
C
188 lines
4.3 KiB
C
/*
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* Generic driver for NXP NCI NFC chips
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*
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* Copyright (C) 2014 NXP Semiconductors All rights reserved.
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*
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* Authors: Clément Perrochaud <clement.perrochaud@nxp.com>
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*
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* Derived from PN544 device driver:
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* Copyright (C) 2012 Intel Corporation. All rights reserved.
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms and conditions of the GNU General Public License,
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* version 2, as published by the Free Software Foundation.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, see <http://www.gnu.org/licenses/>.
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*/
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#include <linux/delay.h>
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#include <linux/gpio.h>
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#include <linux/module.h>
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#include <linux/nfc.h>
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#include <linux/platform_data/nxp-nci.h>
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#include <net/nfc/nci_core.h>
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#include "nxp-nci.h"
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#define NXP_NCI_HDR_LEN 4
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#define NXP_NCI_NFC_PROTOCOLS (NFC_PROTO_JEWEL_MASK | \
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NFC_PROTO_MIFARE_MASK | \
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NFC_PROTO_FELICA_MASK | \
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NFC_PROTO_ISO14443_MASK | \
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NFC_PROTO_ISO14443_B_MASK | \
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NFC_PROTO_NFC_DEP_MASK)
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static int nxp_nci_open(struct nci_dev *ndev)
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{
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struct nxp_nci_info *info = nci_get_drvdata(ndev);
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int r = 0;
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mutex_lock(&info->info_lock);
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if (info->mode != NXP_NCI_MODE_COLD) {
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r = -EBUSY;
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goto open_exit;
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}
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if (info->phy_ops->set_mode)
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r = info->phy_ops->set_mode(info->phy_id, NXP_NCI_MODE_NCI);
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info->mode = NXP_NCI_MODE_NCI;
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open_exit:
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mutex_unlock(&info->info_lock);
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return r;
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}
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static int nxp_nci_close(struct nci_dev *ndev)
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{
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struct nxp_nci_info *info = nci_get_drvdata(ndev);
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int r = 0;
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mutex_lock(&info->info_lock);
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if (info->phy_ops->set_mode)
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r = info->phy_ops->set_mode(info->phy_id, NXP_NCI_MODE_COLD);
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info->mode = NXP_NCI_MODE_COLD;
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mutex_unlock(&info->info_lock);
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return r;
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}
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static int nxp_nci_send(struct nci_dev *ndev, struct sk_buff *skb)
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{
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struct nxp_nci_info *info = nci_get_drvdata(ndev);
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int r;
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if (!info->phy_ops->write) {
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r = -ENOTSUPP;
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goto send_exit;
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}
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if (info->mode != NXP_NCI_MODE_NCI) {
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r = -EINVAL;
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goto send_exit;
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}
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r = info->phy_ops->write(info->phy_id, skb);
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if (r < 0)
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kfree_skb(skb);
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send_exit:
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return r;
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}
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static struct nci_ops nxp_nci_ops = {
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.open = nxp_nci_open,
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.close = nxp_nci_close,
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.send = nxp_nci_send,
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.fw_download = nxp_nci_fw_download,
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};
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int nxp_nci_probe(void *phy_id, struct device *pdev,
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const struct nxp_nci_phy_ops *phy_ops,
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unsigned int max_payload,
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struct nci_dev **ndev)
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{
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struct nxp_nci_info *info;
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int r;
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info = devm_kzalloc(pdev, sizeof(struct nxp_nci_info), GFP_KERNEL);
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if (!info) {
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r = -ENOMEM;
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goto probe_exit;
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}
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info->phy_id = phy_id;
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info->pdev = pdev;
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info->phy_ops = phy_ops;
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info->max_payload = max_payload;
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INIT_WORK(&info->fw_info.work, nxp_nci_fw_work);
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init_completion(&info->fw_info.cmd_completion);
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mutex_init(&info->info_lock);
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if (info->phy_ops->set_mode) {
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r = info->phy_ops->set_mode(info->phy_id, NXP_NCI_MODE_COLD);
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if (r < 0)
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goto probe_exit;
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}
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info->mode = NXP_NCI_MODE_COLD;
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info->ndev = nci_allocate_device(&nxp_nci_ops, NXP_NCI_NFC_PROTOCOLS,
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NXP_NCI_HDR_LEN, 0);
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if (!info->ndev) {
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r = -ENOMEM;
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goto probe_exit;
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}
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nci_set_parent_dev(info->ndev, pdev);
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nci_set_drvdata(info->ndev, info);
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r = nci_register_device(info->ndev);
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if (r < 0)
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goto probe_exit_free_nci;
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*ndev = info->ndev;
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goto probe_exit;
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probe_exit_free_nci:
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nci_free_device(info->ndev);
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probe_exit:
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return r;
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}
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EXPORT_SYMBOL(nxp_nci_probe);
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void nxp_nci_remove(struct nci_dev *ndev)
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{
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struct nxp_nci_info *info = nci_get_drvdata(ndev);
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if (info->mode == NXP_NCI_MODE_FW)
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nxp_nci_fw_work_complete(info, -ESHUTDOWN);
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cancel_work_sync(&info->fw_info.work);
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mutex_lock(&info->info_lock);
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if (info->phy_ops->set_mode)
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info->phy_ops->set_mode(info->phy_id, NXP_NCI_MODE_COLD);
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nci_unregister_device(ndev);
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nci_free_device(ndev);
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mutex_unlock(&info->info_lock);
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}
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EXPORT_SYMBOL(nxp_nci_remove);
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MODULE_LICENSE("GPL");
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MODULE_DESCRIPTION("NXP NCI NFC driver");
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MODULE_AUTHOR("Clément Perrochaud <clement.perrochaud@nxp.com>");
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