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
  43 static 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
  60 open_exit:
  61         mutex_unlock(&info->info_lock);
  62         return r;
  63 }
  64
  65 static 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
  81 static 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
 100 send_exit:
 101         return r;
 102 }
 103
 104 static 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
 111 int 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
 158 probe_exit_free_nci:
 159         nci_free_device(info->ndev);
 160 probe_exit:
 161         return r;
 162 }
 163 EXPORT_SYMBOL(nxp_nci_probe);
 164
 165 void 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 }
 183 EXPORT_SYMBOL(nxp_nci_remove);
 184
 185 MODULE_LICENSE("GPL");
 186 MODULE_DESCRIPTION("NXP NCI NFC driver");
 187 MODULE_AUTHOR("Clément Perrochaud <clement.perrochaud@nxp.com>");