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b9c28286d8
The struct nci_ops is modified by NFC core in only one case: nci_allocate_device() receives too many proprietary commands (prop_ops) to configure. This is a build time known constrain, so a graceful handling of such case is not necessary. Instead, fail the nci_allocate_device() and add BUILD_BUG_ON() to places which set these. This allows to constify the struct nci_ops (consisting of function pointers) for correctness and safety. Signed-off-by: Krzysztof Kozlowski <krzysztof.kozlowski@canonical.com> Signed-off-by: David S. Miller <davem@davemloft.net>
161 lines
3.5 KiB
C
161 lines
3.5 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
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/*
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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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#include <linux/delay.h>
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#include <linux/module.h>
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#include <linux/nfc.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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return -EOPNOTSUPP;
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if (info->mode != NXP_NCI_MODE_NCI)
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return -EINVAL;
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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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return r;
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}
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static const 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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return -ENOMEM;
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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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return r;
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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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return -ENOMEM;
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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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nci_free_device(info->ndev);
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return r;
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}
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*ndev = info->ndev;
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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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