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 28 #define DRIVER_DESC "NCI NFC driver for ST_NCI" 29 30 #define ST_NCI1_X_PROPRIETARY_ISO15693 0x83 31 32 static int st_nci_init(struct nci_dev *ndev) 33 { 34 struct nci_mode_set_cmd cmd; 35 36 cmd.cmd_type = ST_NCI_SET_NFC_MODE; 37 cmd.mode = 1; 38 39 return nci_prop_cmd(ndev, ST_NCI_CORE_PROP, 40 sizeof(struct nci_mode_set_cmd), (__u8 *)&cmd); 41 } 42 43 static int st_nci_open(struct nci_dev *ndev) 44 { 45 struct st_nci_info *info = nci_get_drvdata(ndev); 46 int r; 47 48 if (test_and_set_bit(ST_NCI_RUNNING, &info->flags)) 49 return 0; 50 51 r = ndlc_open(info->ndlc); 52 if (r) 53 clear_bit(ST_NCI_RUNNING, &info->flags); 54 55 return r; 56 } 57 58 static int st_nci_close(struct nci_dev *ndev) 59 { 60 struct st_nci_info *info = nci_get_drvdata(ndev); 61 62 if (!test_bit(ST_NCI_RUNNING, &info->flags)) 63 return 0; 64 65 ndlc_close(info->ndlc); 66 67 clear_bit(ST_NCI_RUNNING, &info->flags); 68 69 return 0; 70 } 71 72 static int st_nci_send(struct nci_dev *ndev, struct sk_buff *skb) 73 { 74 struct st_nci_info *info = nci_get_drvdata(ndev); 75 76 skb->dev = (void *)ndev; 77 78 if (!test_bit(ST_NCI_RUNNING, &info->flags)) 79 return -EBUSY; 80 81 return ndlc_send(info->ndlc, skb); 82 } 83 84 static __u32 st_nci_get_rfprotocol(struct nci_dev *ndev, 85 __u8 rf_protocol) 86 { 87 return rf_protocol == ST_NCI1_X_PROPRIETARY_ISO15693 ? 88 NFC_PROTO_ISO15693_MASK : 0; 89 } 90 91 static int st_nci_prop_rsp_packet(struct nci_dev *ndev, 92 struct sk_buff *skb) 93 { 94 __u8 status = skb->data[0]; 95 96 nci_req_complete(ndev, status); 97 return 0; 98 } 99 100 static struct nci_driver_ops st_nci_prop_ops[] = { 101 { 102 .opcode = nci_opcode_pack(NCI_GID_PROPRIETARY, 103 ST_NCI_CORE_PROP), 104 .rsp = st_nci_prop_rsp_packet, 105 }, 106 }; 107 108 static struct nci_ops st_nci_ops = { 109 .init = st_nci_init, 110 .open = st_nci_open, 111 .close = st_nci_close, 112 .send = st_nci_send, 113 .get_rfprotocol = st_nci_get_rfprotocol, 114 .discover_se = st_nci_discover_se, 115 .enable_se = st_nci_enable_se, 116 .disable_se = st_nci_disable_se, 117 .se_io = st_nci_se_io, 118 .hci_load_session = st_nci_hci_load_session, 119 .hci_event_received = st_nci_hci_event_received, 120 .hci_cmd_received = st_nci_hci_cmd_received, 121 .prop_ops = st_nci_prop_ops, 122 .n_prop_ops = ARRAY_SIZE(st_nci_prop_ops), 123 }; 124 125 int st_nci_probe(struct llt_ndlc *ndlc, int phy_headroom, 126 int phy_tailroom, struct st_nci_se_status *se_status) 127 { 128 struct st_nci_info *info; 129 int r; 130 u32 protocols; 131 132 info = devm_kzalloc(ndlc->dev, 133 sizeof(struct st_nci_info), GFP_KERNEL); 134 if (!info) 135 return -ENOMEM; 136 137 protocols = NFC_PROTO_JEWEL_MASK 138 | NFC_PROTO_MIFARE_MASK 139 | NFC_PROTO_FELICA_MASK 140 | NFC_PROTO_ISO14443_MASK 141 | NFC_PROTO_ISO14443_B_MASK 142 | NFC_PROTO_ISO15693_MASK 143 | NFC_PROTO_NFC_DEP_MASK; 144 145 ndlc->ndev = nci_allocate_device(&st_nci_ops, protocols, 146 phy_headroom, phy_tailroom); 147 if (!ndlc->ndev) { 148 pr_err("Cannot allocate nfc ndev\n"); 149 return -ENOMEM; 150 } 151 info->ndlc = ndlc; 152 153 nci_set_drvdata(ndlc->ndev, info); 154 155 r = st_nci_vendor_cmds_init(ndlc->ndev); 156 if (r) { 157 pr_err("Cannot register proprietary vendor cmds\n"); 158 goto err_reg_dev; 159 } 160 161 r = nci_register_device(ndlc->ndev); 162 if (r) { 163 pr_err("Cannot register nfc device to nci core\n"); 164 goto err_reg_dev; 165 } 166 167 return st_nci_se_init(ndlc->ndev, se_status); 168 169 err_reg_dev: 170 nci_free_device(ndlc->ndev); 171 return r; 172 } 173 EXPORT_SYMBOL_GPL(st_nci_probe); 174 175 void st_nci_remove(struct nci_dev *ndev) 176 { 177 struct st_nci_info *info = nci_get_drvdata(ndev); 178 179 ndlc_close(info->ndlc); 180 181 nci_unregister_device(ndev); 182 nci_free_device(ndev); 183 } 184 EXPORT_SYMBOL_GPL(st_nci_remove); 185 186 MODULE_LICENSE("GPL"); 187 MODULE_DESCRIPTION(DRIVER_DESC); 188