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                   struct nxp_nci_phy_ops *phy_ops, unsigned int max_payload,
 113                   struct nci_dev **ndev)
 114 {
 115         struct nxp_nci_info *info;
 116         int r;
 117
 118         info = devm_kzalloc(pdev, sizeof(struct nxp_nci_info), GFP_KERNEL);
 119         if (!info) {
 120                 r = -ENOMEM;
 121                 goto probe_exit;
 122         }
 123
 124         info->phy_id = phy_id;
 125         info->pdev = pdev;
 126         info->phy_ops = phy_ops;
 127         info->max_payload = max_payload;
 128         INIT_WORK(&info->fw_info.work, nxp_nci_fw_work);
 129         init_completion(&info->fw_info.cmd_completion);
 130         mutex_init(&info->info_lock);
 131
 132         if (info->phy_ops->set_mode) {
 133                 r = info->phy_ops->set_mode(info->phy_id, NXP_NCI_MODE_COLD);
 134                 if (r < 0)
 135                         goto probe_exit;
 136         }
 137
 138         info->mode = NXP_NCI_MODE_COLD;
 139
 140         info->ndev = nci_allocate_device(&nxp_nci_ops, NXP_NCI_NFC_PROTOCOLS,
 141                                          NXP_NCI_HDR_LEN, 0);
 142         if (!info->ndev) {
 143                 r = -ENOMEM;
 144                 goto probe_exit;
 145         }
 146
 147         nci_set_parent_dev(info->ndev, pdev);
 148         nci_set_drvdata(info->ndev, info);
 149         r = nci_register_device(info->ndev);
 150         if (r < 0)
 151                 goto probe_exit_free_nci;
 152
 153         *ndev = info->ndev;
 154
 155         goto probe_exit;
 156
 157 probe_exit_free_nci:
 158         nci_free_device(info->ndev);
 159 probe_exit:
 160         return r;
 161 }
 162 EXPORT_SYMBOL(nxp_nci_probe);
 163
 164 void nxp_nci_remove(struct nci_dev *ndev)
 165 {
 166         struct nxp_nci_info *info = nci_get_drvdata(ndev);
 167
 168         if (info->mode == NXP_NCI_MODE_FW)
 169                 nxp_nci_fw_work_complete(info, -ESHUTDOWN);
 170         cancel_work_sync(&info->fw_info.work);
 171
 172         mutex_lock(&info->info_lock);
 173
 174         if (info->phy_ops->set_mode)
 175                 info->phy_ops->set_mode(info->phy_id, NXP_NCI_MODE_COLD);
 176
 177         nci_unregister_device(ndev);
 178         nci_free_device(ndev);
 179
 180         mutex_unlock(&info->info_lock);
 181 }
 182 EXPORT_SYMBOL(nxp_nci_remove);
 183
 184 MODULE_LICENSE("GPL");
 185 MODULE_DESCRIPTION("NXP NCI NFC driver");
 186 MODULE_AUTHOR("Clément Perrochaud <clement.perrochaud@nxp.com>");