1 /* 2 * The NFC Controller Interface is the communication protocol between an 3 * NFC Controller (NFCC) and a Device Host (DH). 4 * 5 * Copyright (C) 2011 Texas Instruments, Inc. 6 * 7 * Written by Ilan Elias <ilane@ti.com> 8 * 9 * Acknowledgements: 10 * This file is based on hci_event.c, which was written 11 * by Maxim Krasnyansky. 12 * 13 * This program is free software; you can redistribute it and/or modify 14 * it under the terms of the GNU General Public License version 2 15 * as published by the Free Software Foundation 16 * 17 * This program is distributed in the hope that it will be useful, 18 * but WITHOUT ANY WARRANTY; without even the implied warranty of 19 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 20 * GNU General Public License for more details. 21 * 22 * You should have received a copy of the GNU General Public License 23 * along with this program; if not, write to the Free Software 24 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA 25 * 26 */ 27 28 #define pr_fmt(fmt) KBUILD_MODNAME ": %s: " fmt, __func__ 29 30 #include <linux/types.h> 31 #include <linux/interrupt.h> 32 #include <linux/bitops.h> 33 #include <linux/skbuff.h> 34 35 #include "../nfc.h" 36 #include <net/nfc/nci.h> 37 #include <net/nfc/nci_core.h> 38 #include <linux/nfc.h> 39 40 /* Handle NCI Notification packets */ 41 42 static void nci_core_conn_credits_ntf_packet(struct nci_dev *ndev, 43 struct sk_buff *skb) 44 { 45 struct nci_core_conn_credit_ntf *ntf = (void *) skb->data; 46 int i; 47 48 pr_debug("num_entries %d\n", ntf->num_entries); 49 50 if (ntf->num_entries > NCI_MAX_NUM_CONN) 51 ntf->num_entries = NCI_MAX_NUM_CONN; 52 53 /* update the credits */ 54 for (i = 0; i < ntf->num_entries; i++) { 55 ntf->conn_entries[i].conn_id = 56 nci_conn_id(&ntf->conn_entries[i].conn_id); 57 58 pr_debug("entry[%d]: conn_id %d, credits %d\n", 59 i, ntf->conn_entries[i].conn_id, 60 ntf->conn_entries[i].credits); 61 62 if (ntf->conn_entries[i].conn_id == NCI_STATIC_RF_CONN_ID) { 63 /* found static rf connection */ 64 atomic_add(ntf->conn_entries[i].credits, 65 &ndev->credits_cnt); 66 } 67 } 68 69 /* trigger the next tx */ 70 if (!skb_queue_empty(&ndev->tx_q)) 71 queue_work(ndev->tx_wq, &ndev->tx_work); 72 } 73 74 static void nci_core_conn_intf_error_ntf_packet(struct nci_dev *ndev, 75 struct sk_buff *skb) 76 { 77 struct nci_core_intf_error_ntf *ntf = (void *) skb->data; 78 79 ntf->conn_id = nci_conn_id(&ntf->conn_id); 80 81 pr_debug("status 0x%x, conn_id %d\n", ntf->status, ntf->conn_id); 82 83 /* complete the data exchange transaction, if exists */ 84 if (test_bit(NCI_DATA_EXCHANGE, &ndev->flags)) 85 nci_data_exchange_complete(ndev, NULL, -EIO); 86 } 87 88 static __u8 *nci_extract_rf_params_nfca_passive_poll(struct nci_dev *ndev, 89 struct nci_rf_intf_activated_ntf *ntf, __u8 *data) 90 { 91 struct rf_tech_specific_params_nfca_poll *nfca_poll; 92 93 nfca_poll = &ntf->rf_tech_specific_params.nfca_poll; 94 95 nfca_poll->sens_res = __le16_to_cpu(*((__u16 *)data)); 96 data += 2; 97 98 nfca_poll->nfcid1_len = *data++; 99 100 pr_debug("sens_res 0x%x, nfcid1_len %d\n", 101 nfca_poll->sens_res, nfca_poll->nfcid1_len); 102 103 memcpy(nfca_poll->nfcid1, data, nfca_poll->nfcid1_len); 104 data += nfca_poll->nfcid1_len; 105 106 nfca_poll->sel_res_len = *data++; 107 108 if (nfca_poll->sel_res_len != 0) 109 nfca_poll->sel_res = *data++; 110 111 pr_debug("sel_res_len %d, sel_res 0x%x\n", 112 nfca_poll->sel_res_len, 113 nfca_poll->sel_res); 114 115 return data; 116 } 117 118 static int nci_extract_activation_params_iso_dep(struct nci_dev *ndev, 119 struct nci_rf_intf_activated_ntf *ntf, __u8 *data) 120 { 121 struct activation_params_nfca_poll_iso_dep *nfca_poll; 122 123 switch (ntf->activation_rf_tech_and_mode) { 124 case NCI_NFC_A_PASSIVE_POLL_MODE: 125 nfca_poll = &ntf->activation_params.nfca_poll_iso_dep; 126 nfca_poll->rats_res_len = *data++; 127 if (nfca_poll->rats_res_len > 0) { 128 memcpy(nfca_poll->rats_res, 129 data, 130 nfca_poll->rats_res_len); 131 } 132 break; 133 134 default: 135 pr_err("unsupported activation_rf_tech_and_mode 0x%x\n", 136 ntf->activation_rf_tech_and_mode); 137 return -EPROTO; 138 } 139 140 return 0; 141 } 142 143 static void nci_target_found(struct nci_dev *ndev, 144 struct nci_rf_intf_activated_ntf *ntf) 145 { 146 struct nfc_target nfc_tgt; 147 148 if (ntf->rf_protocol == NCI_RF_PROTOCOL_T2T) /* T2T MifareUL */ 149 nfc_tgt.supported_protocols = NFC_PROTO_MIFARE_MASK; 150 else if (ntf->rf_protocol == NCI_RF_PROTOCOL_ISO_DEP) /* 4A */ 151 nfc_tgt.supported_protocols = NFC_PROTO_ISO14443_MASK; 152 else 153 nfc_tgt.supported_protocols = 0; 154 155 nfc_tgt.sens_res = ntf->rf_tech_specific_params.nfca_poll.sens_res; 156 nfc_tgt.sel_res = ntf->rf_tech_specific_params.nfca_poll.sel_res; 157 158 if (!(nfc_tgt.supported_protocols & ndev->poll_prots)) { 159 pr_debug("the target found does not have the desired protocol\n"); 160 return; 161 } 162 163 pr_debug("new target found, supported_protocols 0x%x\n", 164 nfc_tgt.supported_protocols); 165 166 ndev->target_available_prots = nfc_tgt.supported_protocols; 167 ndev->max_data_pkt_payload_size = ntf->max_data_pkt_payload_size; 168 ndev->initial_num_credits = ntf->initial_num_credits; 169 170 /* set the available credits to initial value */ 171 atomic_set(&ndev->credits_cnt, ndev->initial_num_credits); 172 173 nfc_targets_found(ndev->nfc_dev, &nfc_tgt, 1); 174 } 175 176 static void nci_rf_intf_activated_ntf_packet(struct nci_dev *ndev, 177 struct sk_buff *skb) 178 { 179 struct nci_rf_intf_activated_ntf ntf; 180 __u8 *data = skb->data; 181 int err = 0; 182 183 clear_bit(NCI_DISCOVERY, &ndev->flags); 184 set_bit(NCI_POLL_ACTIVE, &ndev->flags); 185 186 ntf.rf_discovery_id = *data++; 187 ntf.rf_interface = *data++; 188 ntf.rf_protocol = *data++; 189 ntf.activation_rf_tech_and_mode = *data++; 190 ntf.max_data_pkt_payload_size = *data++; 191 ntf.initial_num_credits = *data++; 192 ntf.rf_tech_specific_params_len = *data++; 193 194 pr_debug("rf_discovery_id %d\n", ntf.rf_discovery_id); 195 pr_debug("rf_interface 0x%x\n", ntf.rf_interface); 196 pr_debug("rf_protocol 0x%x\n", ntf.rf_protocol); 197 pr_debug("activation_rf_tech_and_mode 0x%x\n", 198 ntf.activation_rf_tech_and_mode); 199 pr_debug("max_data_pkt_payload_size 0x%x\n", 200 ntf.max_data_pkt_payload_size); 201 pr_debug("initial_num_credits 0x%x\n", ntf.initial_num_credits); 202 pr_debug("rf_tech_specific_params_len %d\n", 203 ntf.rf_tech_specific_params_len); 204 205 if (ntf.rf_tech_specific_params_len > 0) { 206 switch (ntf.activation_rf_tech_and_mode) { 207 case NCI_NFC_A_PASSIVE_POLL_MODE: 208 data = nci_extract_rf_params_nfca_passive_poll(ndev, 209 &ntf, data); 210 break; 211 212 default: 213 pr_err("unsupported activation_rf_tech_and_mode 0x%x\n", 214 ntf.activation_rf_tech_and_mode); 215 return; 216 } 217 } 218 219 ntf.data_exch_rf_tech_and_mode = *data++; 220 ntf.data_exch_tx_bit_rate = *data++; 221 ntf.data_exch_rx_bit_rate = *data++; 222 ntf.activation_params_len = *data++; 223 224 pr_debug("data_exch_rf_tech_and_mode 0x%x\n", 225 ntf.data_exch_rf_tech_and_mode); 226 pr_debug("data_exch_tx_bit_rate 0x%x\n", 227 ntf.data_exch_tx_bit_rate); 228 pr_debug("data_exch_rx_bit_rate 0x%x\n", 229 ntf.data_exch_rx_bit_rate); 230 pr_debug("activation_params_len %d\n", 231 ntf.activation_params_len); 232 233 if (ntf.activation_params_len > 0) { 234 switch (ntf.rf_interface) { 235 case NCI_RF_INTERFACE_ISO_DEP: 236 err = nci_extract_activation_params_iso_dep(ndev, 237 &ntf, data); 238 break; 239 240 case NCI_RF_INTERFACE_FRAME: 241 /* no activation params */ 242 break; 243 244 default: 245 pr_err("unsupported rf_interface 0x%x\n", 246 ntf.rf_interface); 247 return; 248 } 249 } 250 251 if (!err) 252 nci_target_found(ndev, &ntf); 253 } 254 255 static void nci_rf_deactivate_ntf_packet(struct nci_dev *ndev, 256 struct sk_buff *skb) 257 { 258 struct nci_rf_deactivate_ntf *ntf = (void *) skb->data; 259 260 pr_debug("entry, type 0x%x, reason 0x%x\n", ntf->type, ntf->reason); 261 262 clear_bit(NCI_POLL_ACTIVE, &ndev->flags); 263 ndev->target_active_prot = 0; 264 265 /* drop tx data queue */ 266 skb_queue_purge(&ndev->tx_q); 267 268 /* drop partial rx data packet */ 269 if (ndev->rx_data_reassembly) { 270 kfree_skb(ndev->rx_data_reassembly); 271 ndev->rx_data_reassembly = 0; 272 } 273 274 /* complete the data exchange transaction, if exists */ 275 if (test_bit(NCI_DATA_EXCHANGE, &ndev->flags)) 276 nci_data_exchange_complete(ndev, NULL, -EIO); 277 } 278 279 void nci_ntf_packet(struct nci_dev *ndev, struct sk_buff *skb) 280 { 281 __u16 ntf_opcode = nci_opcode(skb->data); 282 283 pr_debug("NCI RX: MT=ntf, PBF=%d, GID=0x%x, OID=0x%x, plen=%d\n", 284 nci_pbf(skb->data), 285 nci_opcode_gid(ntf_opcode), 286 nci_opcode_oid(ntf_opcode), 287 nci_plen(skb->data)); 288 289 /* strip the nci control header */ 290 skb_pull(skb, NCI_CTRL_HDR_SIZE); 291 292 switch (ntf_opcode) { 293 case NCI_OP_CORE_CONN_CREDITS_NTF: 294 nci_core_conn_credits_ntf_packet(ndev, skb); 295 break; 296 297 case NCI_OP_CORE_INTF_ERROR_NTF: 298 nci_core_conn_intf_error_ntf_packet(ndev, skb); 299 break; 300 301 case NCI_OP_RF_INTF_ACTIVATED_NTF: 302 nci_rf_intf_activated_ntf_packet(ndev, skb); 303 break; 304 305 case NCI_OP_RF_DEACTIVATE_NTF: 306 nci_rf_deactivate_ntf_packet(ndev, skb); 307 break; 308 309 default: 310 pr_err("unknown ntf opcode 0x%x\n", ntf_opcode); 311 break; 312 } 313 314 kfree_skb(skb); 315 } 316