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

   1/*
   2 * Generic driver for NXP NCI NFC chips
   3 *
   4 * Copyright (C) 2014  NXP Semiconductors  All rights reserved.
   5 *
   6 * Authors: Clément Perrochaud <clement.perrochaud@nxp.com>
   7 *
   8 * Derived from PN544 device driver:
   9 * Copyright (C) 2012  Intel Corporation. All rights reserved.
  10 *
  11 * This program is free software; you can redistribute it and/or modify it
  12 * under the terms and conditions of the GNU General Public License,
  13 * version 2, as published by the Free Software Foundation.
  14 *
  15 * This program is distributed in the hope that it will be useful,
  16 * but WITHOUT ANY WARRANTY; without even the implied warranty of
  17 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
  18 * GNU General Public License for more details.
  19 *
  20 * You should have received a copy of the GNU General Public License
  21 * along with this program; if not, see <http://www.gnu.org/licenses/>.
  22 */
  23
  24#include <linux/delay.h>
  25#include <linux/gpio.h>
  26#include <linux/module.h>
  27#include <linux/nfc.h>
  28#include <linux/platform_data/nxp-nci.h>
  29
  30#include <net/nfc/nci_core.h>
  31
  32#include "nxp-nci.h"
  33
  34#define NXP_NCI_HDR_LEN 4
  35
  36#define NXP_NCI_NFC_PROTOCOLS (NFC_PROTO_JEWEL_MASK | \
  37                               NFC_PROTO_MIFARE_MASK | \
  38                               NFC_PROTO_FELICA_MASK | \
  39                               NFC_PROTO_ISO14443_MASK | \
  40                               NFC_PROTO_ISO14443_B_MASK | \
  41                               NFC_PROTO_NFC_DEP_MASK)
  42
  43static int nxp_nci_open(struct nci_dev *ndev)
  44{
  45        struct nxp_nci_info *info = nci_get_drvdata(ndev);
  46        int r = 0;
  47
  48        mutex_lock(&info->info_lock);
  49
  50        if (info->mode != NXP_NCI_MODE_COLD) {
  51                r = -EBUSY;
  52                goto open_exit;
  53        }
  54
  55        if (info->phy_ops->set_mode)
  56                r = info->phy_ops->set_mode(info->phy_id, NXP_NCI_MODE_NCI);
  57
  58        info->mode = NXP_NCI_MODE_NCI;
  59
  60open_exit:
  61        mutex_unlock(&info->info_lock);
  62        return r;
  63}
  64
  65static int nxp_nci_close(struct nci_dev *ndev)
  66{
  67        struct nxp_nci_info *info = nci_get_drvdata(ndev);
  68        int r = 0;
  69
  70        mutex_lock(&info->info_lock);
  71
  72        if (info->phy_ops->set_mode)
  73                r = info->phy_ops->set_mode(info->phy_id, NXP_NCI_MODE_COLD);
  74
  75        info->mode = NXP_NCI_MODE_COLD;
  76
  77        mutex_unlock(&info->info_lock);
  78        return r;
  79}
  80
  81static int nxp_nci_send(struct nci_dev *ndev, struct sk_buff *skb)
  82{
  83        struct nxp_nci_info *info = nci_get_drvdata(ndev);
  84        int r;
  85
  86        if (!info->phy_ops->write) {
  87                r = -ENOTSUPP;
  88                goto send_exit;
  89        }
  90
  91        if (info->mode != NXP_NCI_MODE_NCI) {
  92                r = -EINVAL;
  93                goto send_exit;
  94        }
  95
  96        r = info->phy_ops->write(info->phy_id, skb);
  97        if (r < 0)
  98                kfree_skb(skb);
  99
 100send_exit:
 101        return r;
 102}
 103
 104static struct nci_ops nxp_nci_ops = {
 105        .open = nxp_nci_open,
 106        .close = nxp_nci_close,
 107        .send = nxp_nci_send,
 108        .fw_download = nxp_nci_fw_download,
 109};
 110
 111int nxp_nci_probe(void *phy_id, struct device *pdev,
 112                  const struct nxp_nci_phy_ops *phy_ops,
 113                  unsigned int max_payload,
 114                  struct nci_dev **ndev)
 115{
 116        struct nxp_nci_info *info;
 117        int r;
 118
 119        info = devm_kzalloc(pdev, sizeof(struct nxp_nci_info), GFP_KERNEL);
 120        if (!info) {
 121                r = -ENOMEM;
 122                goto probe_exit;
 123        }
 124
 125        info->phy_id = phy_id;
 126        info->pdev = pdev;
 127        info->phy_ops = phy_ops;
 128        info->max_payload = max_payload;
 129        INIT_WORK(&info->fw_info.work, nxp_nci_fw_work);
 130        init_completion(&info->fw_info.cmd_completion);
 131        mutex_init(&info->info_lock);
 132
 133        if (info->phy_ops->set_mode) {
 134                r = info->phy_ops->set_mode(info->phy_id, NXP_NCI_MODE_COLD);
 135                if (r < 0)
 136                        goto probe_exit;
 137        }
 138
 139        info->mode = NXP_NCI_MODE_COLD;
 140
 141        info->ndev = nci_allocate_device(&nxp_nci_ops, NXP_NCI_NFC_PROTOCOLS,
 142                                         NXP_NCI_HDR_LEN, 0);
 143        if (!info->ndev) {
 144                r = -ENOMEM;
 145                goto probe_exit;
 146        }
 147
 148        nci_set_parent_dev(info->ndev, pdev);
 149        nci_set_drvdata(info->ndev, info);
 150        r = nci_register_device(info->ndev);
 151        if (r < 0)
 152                goto probe_exit_free_nci;
 153
 154        *ndev = info->ndev;
 155
 156        goto probe_exit;
 157
 158probe_exit_free_nci:
 159        nci_free_device(info->ndev);
 160probe_exit:
 161        return r;
 162}
 163EXPORT_SYMBOL(nxp_nci_probe);
 164
 165void nxp_nci_remove(struct nci_dev *ndev)
 166{
 167        struct nxp_nci_info *info = nci_get_drvdata(ndev);
 168
 169        if (info->mode == NXP_NCI_MODE_FW)
 170                nxp_nci_fw_work_complete(info, -ESHUTDOWN);
 171        cancel_work_sync(&info->fw_info.work);
 172
 173        mutex_lock(&info->info_lock);
 174
 175        if (info->phy_ops->set_mode)
 176                info->phy_ops->set_mode(info->phy_id, NXP_NCI_MODE_COLD);
 177
 178        nci_unregister_device(ndev);
 179        nci_free_device(ndev);
 180
 181        mutex_unlock(&info->info_lock);
 182}
 183EXPORT_SYMBOL(nxp_nci_remove);
 184
 185MODULE_LICENSE("GPL");
 186MODULE_DESCRIPTION("NXP NCI NFC driver");
 187MODULE_AUTHOR("Clément Perrochaud <clement.perrochaud@nxp.com>");
 188