LXR linux/drivers/nfc/nxp-nci/core.c

   1// SPDX-License-Identifier: GPL-2.0-only
   2/*
   3 * Generic driver for NXP NCI NFC chips
   4 *
   5 * Copyright (C) 2014  NXP Semiconductors  All rights reserved.
   6 *
   7 * Authors: Clément Perrochaud <clement.perrochaud@nxp.com>
   8 *
   9 * Derived from PN544 device driver:
  10 * Copyright (C) 2012  Intel Corporation. All rights reserved.
  11 */
  12
  13#include <linux/delay.h>
  14#include <linux/module.h>
  15#include <linux/nfc.h>
  16
  17#include <net/nfc/nci_core.h>
  18
  19#include "nxp-nci.h"
  20
  21#define NXP_NCI_HDR_LEN 4
  22
  23#define NXP_NCI_NFC_PROTOCOLS (NFC_PROTO_JEWEL_MASK | \
  24                               NFC_PROTO_MIFARE_MASK | \
  25                               NFC_PROTO_FELICA_MASK | \
  26                               NFC_PROTO_ISO14443_MASK | \
  27                               NFC_PROTO_ISO14443_B_MASK | \
  28                               NFC_PROTO_NFC_DEP_MASK)
  29
  30static int nxp_nci_open(struct nci_dev *ndev)
  31{
  32        struct nxp_nci_info *info = nci_get_drvdata(ndev);
  33        int r = 0;
  34
  35        mutex_lock(&info->info_lock);
  36
  37        if (info->mode != NXP_NCI_MODE_COLD) {
  38                r = -EBUSY;
  39                goto open_exit;
  40        }
  41
  42        if (info->phy_ops->set_mode)
  43                r = info->phy_ops->set_mode(info->phy_id, NXP_NCI_MODE_NCI);
  44
  45        info->mode = NXP_NCI_MODE_NCI;
  46
  47open_exit:
  48        mutex_unlock(&info->info_lock);
  49        return r;
  50}
  51
  52static int nxp_nci_close(struct nci_dev *ndev)
  53{
  54        struct nxp_nci_info *info = nci_get_drvdata(ndev);
  55        int r = 0;
  56
  57        mutex_lock(&info->info_lock);
  58
  59        if (info->phy_ops->set_mode)
  60                r = info->phy_ops->set_mode(info->phy_id, NXP_NCI_MODE_COLD);
  61
  62        info->mode = NXP_NCI_MODE_COLD;
  63
  64        mutex_unlock(&info->info_lock);
  65        return r;
  66}
  67
  68static int nxp_nci_send(struct nci_dev *ndev, struct sk_buff *skb)
  69{
  70        struct nxp_nci_info *info = nci_get_drvdata(ndev);
  71        int r;
  72
  73        if (!info->phy_ops->write)
  74                return -EOPNOTSUPP;
  75
  76        if (info->mode != NXP_NCI_MODE_NCI)
  77                return -EINVAL;
  78
  79        r = info->phy_ops->write(info->phy_id, skb);
  80        if (r < 0)
  81                kfree_skb(skb);
  82
  83        return r;
  84}
  85
  86static const struct nci_ops nxp_nci_ops = {
  87        .open = nxp_nci_open,
  88        .close = nxp_nci_close,
  89        .send = nxp_nci_send,
  90        .fw_download = nxp_nci_fw_download,
  91};
  92
  93int nxp_nci_probe(void *phy_id, struct device *pdev,
  94                  const struct nxp_nci_phy_ops *phy_ops,
  95                  unsigned int max_payload,
  96                  struct nci_dev **ndev)
  97{
  98        struct nxp_nci_info *info;
  99        int r;
 100
 101        info = devm_kzalloc(pdev, sizeof(struct nxp_nci_info), GFP_KERNEL);
 102        if (!info)
 103                return -ENOMEM;
 104
 105        info->phy_id = phy_id;
 106        info->pdev = pdev;
 107        info->phy_ops = phy_ops;
 108        info->max_payload = max_payload;
 109        INIT_WORK(&info->fw_info.work, nxp_nci_fw_work);
 110        init_completion(&info->fw_info.cmd_completion);
 111        mutex_init(&info->info_lock);
 112
 113        if (info->phy_ops->set_mode) {
 114                r = info->phy_ops->set_mode(info->phy_id, NXP_NCI_MODE_COLD);
 115                if (r < 0)
 116                        return r;
 117        }
 118
 119        info->mode = NXP_NCI_MODE_COLD;
 120
 121        info->ndev = nci_allocate_device(&nxp_nci_ops, NXP_NCI_NFC_PROTOCOLS,
 122                                         NXP_NCI_HDR_LEN, 0);
 123        if (!info->ndev)
 124                return -ENOMEM;
 125
 126        nci_set_parent_dev(info->ndev, pdev);
 127        nci_set_drvdata(info->ndev, info);
 128        r = nci_register_device(info->ndev);
 129        if (r < 0) {
 130                nci_free_device(info->ndev);
 131                return r;
 132        }
 133
 134        *ndev = info->ndev;
 135        return r;
 136}
 137EXPORT_SYMBOL(nxp_nci_probe);
 138
 139void nxp_nci_remove(struct nci_dev *ndev)
 140{
 141        struct nxp_nci_info *info = nci_get_drvdata(ndev);
 142
 143        if (info->mode == NXP_NCI_MODE_FW)
 144                nxp_nci_fw_work_complete(info, -ESHUTDOWN);
 145        cancel_work_sync(&info->fw_info.work);
 146
 147        mutex_lock(&info->info_lock);
 148
 149        if (info->phy_ops->set_mode)
 150                info->phy_ops->set_mode(info->phy_id, NXP_NCI_MODE_COLD);
 151
 152        nci_unregister_device(ndev);
 153        nci_free_device(ndev);
 154
 155        mutex_unlock(&info->info_lock);
 156}
 157EXPORT_SYMBOL(nxp_nci_remove);
 158
 159MODULE_LICENSE("GPL");
 160MODULE_DESCRIPTION("NXP NCI NFC driver");
 161MODULE_AUTHOR("Clément Perrochaud <clement.perrochaud@nxp.com>");
 162