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