1 /* 2 * NCI based Driver for STMicroelectronics NFC Chip 3 * 4 * Copyright (C) 2014-2015 STMicroelectronics SAS. All rights reserved. 5 * 6 * This program is free software; you can redistribute it and/or modify it 7 * under the terms and conditions of the GNU General Public License, 8 * version 2, as published by the Free Software Foundation. 9 * 10 * This program is distributed in the hope that it will be useful, 11 * but WITHOUT ANY WARRANTY; without even the implied warranty of 12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 13 * GNU General Public License for more details. 14 * 15 * You should have received a copy of the GNU General Public License 16 * along with this program; if not, see <http://www.gnu.org/licenses/>. 17 */ 18 19 #include <linux/module.h> 20 #include <linux/nfc.h> 21 #include <net/nfc/nci.h> 22 #include <net/nfc/nci_core.h> 23 #include <linux/gpio.h> 24 #include <linux/delay.h> 25 26 #include "st-nci.h" 27 #include "st-nci_se.h" 28 29 #define DRIVER_DESC "NCI NFC driver for ST_NCI" 30 31 #define ST_NCI1_X_PROPRIETARY_ISO15693 0x83 32 33 static int st_nci_init(struct nci_dev *ndev) 34 { 35 struct nci_mode_set_cmd cmd; 36 37 cmd.cmd_type = ST_NCI_SET_NFC_MODE; 38 cmd.mode = 1; 39 40 return nci_prop_cmd(ndev, ST_NCI_CORE_PROP, 41 sizeof(struct nci_mode_set_cmd), (__u8 *)&cmd); 42 } 43 44 static int st_nci_open(struct nci_dev *ndev) 45 { 46 struct st_nci_info *info = nci_get_drvdata(ndev); 47 int r; 48 49 if (test_and_set_bit(ST_NCI_RUNNING, &info->flags)) 50 return 0; 51 52 r = ndlc_open(info->ndlc); 53 if (r) 54 clear_bit(ST_NCI_RUNNING, &info->flags); 55 56 return r; 57 } 58 59 static int st_nci_close(struct nci_dev *ndev) 60 { 61 struct st_nci_info *info = nci_get_drvdata(ndev); 62 63 if (!test_bit(ST_NCI_RUNNING, &info->flags)) 64 return 0; 65 66 ndlc_close(info->ndlc); 67 68 clear_bit(ST_NCI_RUNNING, &info->flags); 69 70 return 0; 71 } 72 73 static int st_nci_send(struct nci_dev *ndev, struct sk_buff *skb) 74 { 75 struct st_nci_info *info = nci_get_drvdata(ndev); 76 77 skb->dev = (void *)ndev; 78 79 if (!test_bit(ST_NCI_RUNNING, &info->flags)) 80 return -EBUSY; 81 82 return ndlc_send(info->ndlc, skb); 83 } 84 85 static __u32 st_nci_get_rfprotocol(struct nci_dev *ndev, 86 __u8 rf_protocol) 87 { 88 return rf_protocol == ST_NCI1_X_PROPRIETARY_ISO15693 ? 89 NFC_PROTO_ISO15693_MASK : 0; 90 } 91 92 static int st_nci_prop_rsp_packet(struct nci_dev *ndev, 93 struct sk_buff *skb) 94 { 95 __u8 status = skb->data[0]; 96 97 nci_req_complete(ndev, status); 98 return 0; 99 } 100 101 static struct nci_prop_ops st_nci_prop_ops[] = { 102 { 103 .opcode = nci_opcode_pack(NCI_GID_PROPRIETARY, 104 ST_NCI_CORE_PROP), 105 .rsp = st_nci_prop_rsp_packet, 106 }, 107 }; 108 109 static struct nci_ops st_nci_ops = { 110 .init = st_nci_init, 111 .open = st_nci_open, 112 .close = st_nci_close, 113 .send = st_nci_send, 114 .get_rfprotocol = st_nci_get_rfprotocol, 115 .discover_se = st_nci_discover_se, 116 .enable_se = st_nci_enable_se, 117 .disable_se = st_nci_disable_se, 118 .se_io = st_nci_se_io, 119 .hci_load_session = st_nci_hci_load_session, 120 .hci_event_received = st_nci_hci_event_received, 121 .hci_cmd_received = st_nci_hci_cmd_received, 122 .prop_ops = st_nci_prop_ops, 123 .n_prop_ops = ARRAY_SIZE(st_nci_prop_ops), 124 }; 125 126 int st_nci_probe(struct llt_ndlc *ndlc, int phy_headroom, 127 int phy_tailroom) 128 { 129 struct st_nci_info *info; 130 int r; 131 u32 protocols; 132 133 info = devm_kzalloc(ndlc->dev, 134 sizeof(struct st_nci_info), GFP_KERNEL); 135 if (!info) 136 return -ENOMEM; 137 138 protocols = NFC_PROTO_JEWEL_MASK 139 | NFC_PROTO_MIFARE_MASK 140 | NFC_PROTO_FELICA_MASK 141 | NFC_PROTO_ISO14443_MASK 142 | NFC_PROTO_ISO14443_B_MASK 143 | NFC_PROTO_ISO15693_MASK 144 | NFC_PROTO_NFC_DEP_MASK; 145 146 ndlc->ndev = nci_allocate_device(&st_nci_ops, protocols, 147 phy_headroom, phy_tailroom); 148 if (!ndlc->ndev) { 149 pr_err("Cannot allocate nfc ndev\n"); 150 return -ENOMEM; 151 } 152 info->ndlc = ndlc; 153 154 nci_set_drvdata(ndlc->ndev, info); 155 156 r = nci_register_device(ndlc->ndev); 157 if (r) { 158 pr_err("Cannot register nfc device to nci core\n"); 159 nci_free_device(ndlc->ndev); 160 return r; 161 } 162 163 return st_nci_se_init(ndlc->ndev); 164 } 165 EXPORT_SYMBOL_GPL(st_nci_probe); 166 167 void st_nci_remove(struct nci_dev *ndev) 168 { 169 struct st_nci_info *info = nci_get_drvdata(ndev); 170 171 ndlc_close(info->ndlc); 172 173 nci_unregister_device(ndev); 174 nci_free_device(ndev); 175 } 176 EXPORT_SYMBOL_GPL(st_nci_remove); 177 178 MODULE_LICENSE("GPL"); 179 MODULE_DESCRIPTION(DRIVER_DESC); 180