drivers/nfc/st-nci/core.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  * NCI based Driver for STMicroelectronics NFC Chip
   4  *
   5  * Copyright (C) 2014-2015  STMicroelectronics SAS. All rights reserved.
   6  */
   7
   8 #include <linux/module.h>
   9 #include <linux/nfc.h>
  10 #include <net/nfc/nci.h>
  11 #include <net/nfc/nci_core.h>
  12
  13 #include "st-nci.h"
  14
  15 #define DRIVER_DESC "NCI NFC driver for ST_NCI"
  16
  17 #define ST_NCI1_X_PROPRIETARY_ISO15693 0x83
  18
  19 static int st_nci_init(struct nci_dev *ndev)
  20 {
  21         struct nci_mode_set_cmd cmd;
  22
  23         cmd.cmd_type = ST_NCI_SET_NFC_MODE;
  24         cmd.mode = 1;
  25
  26         return nci_prop_cmd(ndev, ST_NCI_CORE_PROP,
  27                         sizeof(struct nci_mode_set_cmd), (__u8 *)&cmd);
  28 }
  29
  30 static int st_nci_open(struct nci_dev *ndev)
  31 {
  32         struct st_nci_info *info = nci_get_drvdata(ndev);
  33         int r;
  34
  35         if (test_and_set_bit(ST_NCI_RUNNING, &info->flags))
  36                 return 0;
  37
  38         r = ndlc_open(info->ndlc);
  39         if (r)
  40                 clear_bit(ST_NCI_RUNNING, &info->flags);
  41
  42         return r;
  43 }
  44
  45 static int st_nci_close(struct nci_dev *ndev)
  46 {
  47         struct st_nci_info *info = nci_get_drvdata(ndev);
  48
  49         if (!test_bit(ST_NCI_RUNNING, &info->flags))
  50                 return 0;
  51
  52         ndlc_close(info->ndlc);
  53
  54         clear_bit(ST_NCI_RUNNING, &info->flags);
  55
  56         return 0;
  57 }
  58
  59 static int st_nci_send(struct nci_dev *ndev, struct sk_buff *skb)
  60 {
  61         struct st_nci_info *info = nci_get_drvdata(ndev);
  62
  63         skb->dev = (void *)ndev;
  64
  65         if (!test_bit(ST_NCI_RUNNING, &info->flags))
  66                 return -EBUSY;
  67
  68         return ndlc_send(info->ndlc, skb);
  69 }
  70
  71 static __u32 st_nci_get_rfprotocol(struct nci_dev *ndev,
  72                                          __u8 rf_protocol)
  73 {
  74         return rf_protocol == ST_NCI1_X_PROPRIETARY_ISO15693 ?
  75                 NFC_PROTO_ISO15693_MASK : 0;
  76 }
  77
  78 static int st_nci_prop_rsp_packet(struct nci_dev *ndev,
  79                                         struct sk_buff *skb)
  80 {
  81         __u8 status = skb->data[0];
  82
  83         nci_req_complete(ndev, status);
  84         return 0;
  85 }
  86
  87 static const struct nci_driver_ops st_nci_prop_ops[] = {
  88         {
  89                 .opcode = nci_opcode_pack(NCI_GID_PROPRIETARY,
  90                                           ST_NCI_CORE_PROP),
  91                 .rsp = st_nci_prop_rsp_packet,
  92         },
  93 };
  94
  95 static const struct nci_ops st_nci_ops = {
  96         .init = st_nci_init,
  97         .open = st_nci_open,
  98         .close = st_nci_close,
  99         .send = st_nci_send,
 100         .get_rfprotocol = st_nci_get_rfprotocol,
 101         .discover_se = st_nci_discover_se,
 102         .enable_se = st_nci_enable_se,
 103         .disable_se = st_nci_disable_se,
 104         .se_io = st_nci_se_io,
 105         .hci_load_session = st_nci_hci_load_session,
 106         .hci_event_received = st_nci_hci_event_received,
 107         .hci_cmd_received = st_nci_hci_cmd_received,
 108         .prop_ops = st_nci_prop_ops,
 109         .n_prop_ops = ARRAY_SIZE(st_nci_prop_ops),
 110 };
 111
 112 int st_nci_probe(struct llt_ndlc *ndlc, int phy_headroom,
 113                  int phy_tailroom, struct st_nci_se_status *se_status)
 114 {
 115         struct st_nci_info *info;
 116         int r;
 117         u32 protocols;
 118
 119         info = devm_kzalloc(ndlc->dev,
 120                         sizeof(struct st_nci_info), GFP_KERNEL);
 121         if (!info)
 122                 return -ENOMEM;
 123
 124         protocols = NFC_PROTO_JEWEL_MASK
 125                 | NFC_PROTO_MIFARE_MASK
 126                 | NFC_PROTO_FELICA_MASK
 127                 | NFC_PROTO_ISO14443_MASK
 128                 | NFC_PROTO_ISO14443_B_MASK
 129                 | NFC_PROTO_ISO15693_MASK
 130                 | NFC_PROTO_NFC_DEP_MASK;
 131
 132         BUILD_BUG_ON(ARRAY_SIZE(st_nci_prop_ops) > NCI_MAX_PROPRIETARY_CMD);
 133         ndlc->ndev = nci_allocate_device(&st_nci_ops, protocols,
 134                                         phy_headroom, phy_tailroom);
 135         if (!ndlc->ndev) {
 136                 pr_err("Cannot allocate nfc ndev\n");
 137                 return -ENOMEM;
 138         }
 139         info->ndlc = ndlc;
 140
 141         nci_set_drvdata(ndlc->ndev, info);
 142
 143         r = st_nci_vendor_cmds_init(ndlc->ndev);
 144         if (r) {
 145                 pr_err("Cannot register proprietary vendor cmds\n");
 146                 goto err_reg_dev;
 147         }
 148
 149         r = nci_register_device(ndlc->ndev);
 150         if (r) {
 151                 pr_err("Cannot register nfc device to nci core\n");
 152                 goto err_reg_dev;
 153         }
 154
 155         return st_nci_se_init(ndlc->ndev, se_status);
 156
 157 err_reg_dev:
 158         nci_free_device(ndlc->ndev);
 159         return r;
 160 }
 161 EXPORT_SYMBOL_GPL(st_nci_probe);
 162
 163 void st_nci_remove(struct nci_dev *ndev)
 164 {
 165         struct st_nci_info *info = nci_get_drvdata(ndev);
 166
 167         ndlc_close(info->ndlc);
 168
 169         nci_unregister_device(ndev);
 170         nci_free_device(ndev);
 171 }
 172 EXPORT_SYMBOL_GPL(st_nci_remove);
 173
 174 MODULE_LICENSE("GPL");
 175 MODULE_DESCRIPTION(DRIVER_DESC);