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| 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); |
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