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, see <http://www.gnu.org/licenses/>. 24 * 25 */ 26 27 #define pr_fmt(fmt) KBUILD_MODNAME ": %s: " fmt, __func__ 28 29 #include <linux/types.h> 30 #include <linux/interrupt.h> 31 #include <linux/bitops.h> 32 #include <linux/skbuff.h> 33 34 #include "../nfc.h" 35 #include <net/nfc/nci.h> 36 #include <net/nfc/nci_core.h> 37 38 /* Handle NCI Response packets */ 39 40 static void nci_core_reset_rsp_packet(struct nci_dev *ndev, struct sk_buff *skb) 41 { 42 struct nci_core_reset_rsp *rsp = (void *) skb->data; 43 44 pr_debug("status 0x%x\n", rsp->status); 45 46 if (rsp->status == NCI_STATUS_OK) { 47 ndev->nci_ver = rsp->nci_ver; 48 pr_debug("nci_ver 0x%x, config_status 0x%x\n", 49 rsp->nci_ver, rsp->config_status); 50 } 51 52 nci_req_complete(ndev, rsp->status); 53 } 54 55 static void nci_core_init_rsp_packet(struct nci_dev *ndev, struct sk_buff *skb) 56 { 57 struct nci_core_init_rsp_1 *rsp_1 = (void *) skb->data; 58 struct nci_core_init_rsp_2 *rsp_2; 59 60 pr_debug("status 0x%x\n", rsp_1->status); 61 62 if (rsp_1->status != NCI_STATUS_OK) 63 goto exit; 64 65 ndev->nfcc_features = __le32_to_cpu(rsp_1->nfcc_features); 66 ndev->num_supported_rf_interfaces = rsp_1->num_supported_rf_interfaces; 67 68 if (ndev->num_supported_rf_interfaces > 69 NCI_MAX_SUPPORTED_RF_INTERFACES) { 70 ndev->num_supported_rf_interfaces = 71 NCI_MAX_SUPPORTED_RF_INTERFACES; 72 } 73 74 memcpy(ndev->supported_rf_interfaces, 75 rsp_1->supported_rf_interfaces, 76 ndev->num_supported_rf_interfaces); 77 78 rsp_2 = (void *) (skb->data + 6 + rsp_1->num_supported_rf_interfaces); 79 80 ndev->max_logical_connections = rsp_2->max_logical_connections; 81 ndev->max_routing_table_size = 82 __le16_to_cpu(rsp_2->max_routing_table_size); 83 ndev->max_ctrl_pkt_payload_len = 84 rsp_2->max_ctrl_pkt_payload_len; 85 ndev->max_size_for_large_params = 86 __le16_to_cpu(rsp_2->max_size_for_large_params); 87 ndev->manufact_id = 88 rsp_2->manufact_id; 89 ndev->manufact_specific_info = 90 __le32_to_cpu(rsp_2->manufact_specific_info); 91 92 pr_debug("nfcc_features 0x%x\n", 93 ndev->nfcc_features); 94 pr_debug("num_supported_rf_interfaces %d\n", 95 ndev->num_supported_rf_interfaces); 96 pr_debug("supported_rf_interfaces[0] 0x%x\n", 97 ndev->supported_rf_interfaces[0]); 98 pr_debug("supported_rf_interfaces[1] 0x%x\n", 99 ndev->supported_rf_interfaces[1]); 100 pr_debug("supported_rf_interfaces[2] 0x%x\n", 101 ndev->supported_rf_interfaces[2]); 102 pr_debug("supported_rf_interfaces[3] 0x%x\n", 103 ndev->supported_rf_interfaces[3]); 104 pr_debug("max_logical_connections %d\n", 105 ndev->max_logical_connections); 106 pr_debug("max_routing_table_size %d\n", 107 ndev->max_routing_table_size); 108 pr_debug("max_ctrl_pkt_payload_len %d\n", 109 ndev->max_ctrl_pkt_payload_len); 110 pr_debug("max_size_for_large_params %d\n", 111 ndev->max_size_for_large_params); 112 pr_debug("manufact_id 0x%x\n", 113 ndev->manufact_id); 114 pr_debug("manufact_specific_info 0x%x\n", 115 ndev->manufact_specific_info); 116 117 exit: 118 nci_req_complete(ndev, rsp_1->status); 119 } 120 121 static void nci_core_set_config_rsp_packet(struct nci_dev *ndev, 122 struct sk_buff *skb) 123 { 124 struct nci_core_set_config_rsp *rsp = (void *) skb->data; 125 126 pr_debug("status 0x%x\n", rsp->status); 127 128 nci_req_complete(ndev, rsp->status); 129 } 130 131 static void nci_rf_disc_map_rsp_packet(struct nci_dev *ndev, 132 struct sk_buff *skb) 133 { 134 __u8 status = skb->data[0]; 135 136 pr_debug("status 0x%x\n", status); 137 138 nci_req_complete(ndev, status); 139 } 140 141 static void nci_rf_disc_rsp_packet(struct nci_dev *ndev, struct sk_buff *skb) 142 { 143 struct nci_conn_info *conn_info; 144 __u8 status = skb->data[0]; 145 146 pr_debug("status 0x%x\n", status); 147 148 if (status == NCI_STATUS_OK) { 149 atomic_set(&ndev->state, NCI_DISCOVERY); 150 151 conn_info = ndev->rf_conn_info; 152 if (!conn_info) { 153 conn_info = devm_kzalloc(&ndev->nfc_dev->dev, 154 sizeof(struct nci_conn_info), 155 GFP_KERNEL); 156 if (!conn_info) { 157 status = NCI_STATUS_REJECTED; 158 goto exit; 159 } 160 conn_info->conn_id = NCI_STATIC_RF_CONN_ID; 161 INIT_LIST_HEAD(&conn_info->list); 162 list_add(&conn_info->list, &ndev->conn_info_list); 163 ndev->rf_conn_info = conn_info; 164 } 165 } 166 167 exit: 168 nci_req_complete(ndev, status); 169 } 170 171 static void nci_rf_disc_select_rsp_packet(struct nci_dev *ndev, 172 struct sk_buff *skb) 173 { 174 __u8 status = skb->data[0]; 175 176 pr_debug("status 0x%x\n", status); 177 178 /* Complete the request on intf_activated_ntf or generic_error_ntf */ 179 if (status != NCI_STATUS_OK) 180 nci_req_complete(ndev, status); 181 } 182 183 static void nci_rf_deactivate_rsp_packet(struct nci_dev *ndev, 184 struct sk_buff *skb) 185 { 186 __u8 status = skb->data[0]; 187 188 pr_debug("status 0x%x\n", status); 189 190 /* If target was active, complete the request only in deactivate_ntf */ 191 if ((status != NCI_STATUS_OK) || 192 (atomic_read(&ndev->state) != NCI_POLL_ACTIVE)) { 193 nci_clear_target_list(ndev); 194 atomic_set(&ndev->state, NCI_IDLE); 195 nci_req_complete(ndev, status); 196 } 197 } 198 199 static void nci_nfcee_discover_rsp_packet(struct nci_dev *ndev, 200 struct sk_buff *skb) 201 { 202 struct nci_nfcee_discover_rsp *discover_rsp; 203 204 if (skb->len != 2) { 205 nci_req_complete(ndev, NCI_STATUS_NFCEE_PROTOCOL_ERROR); 206 return; 207 } 208 209 discover_rsp = (struct nci_nfcee_discover_rsp *)skb->data; 210 211 if (discover_rsp->status != NCI_STATUS_OK || 212 discover_rsp->num_nfcee == 0) 213 nci_req_complete(ndev, discover_rsp->status); 214 } 215 216 static void nci_nfcee_mode_set_rsp_packet(struct nci_dev *ndev, 217 struct sk_buff *skb) 218 { 219 __u8 status = skb->data[0]; 220 221 pr_debug("status 0x%x\n", status); 222 nci_req_complete(ndev, status); 223 } 224 225 static void nci_core_conn_create_rsp_packet(struct nci_dev *ndev, 226 struct sk_buff *skb) 227 { 228 __u8 status = skb->data[0]; 229 struct nci_conn_info *conn_info; 230 struct nci_core_conn_create_rsp *rsp; 231 232 pr_debug("status 0x%x\n", status); 233 234 if (status == NCI_STATUS_OK) { 235 rsp = (struct nci_core_conn_create_rsp *)skb->data; 236 237 conn_info = devm_kzalloc(&ndev->nfc_dev->dev, 238 sizeof(*conn_info), GFP_KERNEL); 239 if (!conn_info) { 240 status = NCI_STATUS_REJECTED; 241 goto exit; 242 } 243 244 conn_info->id = ndev->cur_id; 245 conn_info->conn_id = rsp->conn_id; 246 247 /* Note: data_exchange_cb and data_exchange_cb_context need to 248 * be specify out of nci_core_conn_create_rsp_packet 249 */ 250 251 INIT_LIST_HEAD(&conn_info->list); 252 list_add(&conn_info->list, &ndev->conn_info_list); 253 254 if (ndev->cur_id == ndev->hci_dev->nfcee_id) 255 ndev->hci_dev->conn_info = conn_info; 256 257 conn_info->conn_id = rsp->conn_id; 258 conn_info->max_pkt_payload_len = rsp->max_ctrl_pkt_payload_len; 259 atomic_set(&conn_info->credits_cnt, rsp->credits_cnt); 260 } 261 262 exit: 263 nci_req_complete(ndev, status); 264 } 265 266 static void nci_core_conn_close_rsp_packet(struct nci_dev *ndev, 267 struct sk_buff *skb) 268 { 269 struct nci_conn_info *conn_info; 270 __u8 status = skb->data[0]; 271 272 pr_debug("status 0x%x\n", status); 273 if (status == NCI_STATUS_OK) { 274 conn_info = nci_get_conn_info_by_conn_id(ndev, ndev->cur_id); 275 if (conn_info) { 276 list_del(&conn_info->list); 277 devm_kfree(&ndev->nfc_dev->dev, conn_info); 278 } 279 } 280 nci_req_complete(ndev, status); 281 } 282 283 void nci_rsp_packet(struct nci_dev *ndev, struct sk_buff *skb) 284 { 285 __u16 rsp_opcode = nci_opcode(skb->data); 286 287 /* we got a rsp, stop the cmd timer */ 288 del_timer(&ndev->cmd_timer); 289 290 pr_debug("NCI RX: MT=rsp, PBF=%d, GID=0x%x, OID=0x%x, plen=%d\n", 291 nci_pbf(skb->data), 292 nci_opcode_gid(rsp_opcode), 293 nci_opcode_oid(rsp_opcode), 294 nci_plen(skb->data)); 295 296 /* strip the nci control header */ 297 skb_pull(skb, NCI_CTRL_HDR_SIZE); 298 299 switch (rsp_opcode) { 300 case NCI_OP_CORE_RESET_RSP: 301 nci_core_reset_rsp_packet(ndev, skb); 302 break; 303 304 case NCI_OP_CORE_INIT_RSP: 305 nci_core_init_rsp_packet(ndev, skb); 306 break; 307 308 case NCI_OP_CORE_SET_CONFIG_RSP: 309 nci_core_set_config_rsp_packet(ndev, skb); 310 break; 311 312 case NCI_OP_CORE_CONN_CREATE_RSP: 313 nci_core_conn_create_rsp_packet(ndev, skb); 314 break; 315 316 case NCI_OP_CORE_CONN_CLOSE_RSP: 317 nci_core_conn_close_rsp_packet(ndev, skb); 318 break; 319 320 case NCI_OP_RF_DISCOVER_MAP_RSP: 321 nci_rf_disc_map_rsp_packet(ndev, skb); 322 break; 323 324 case NCI_OP_RF_DISCOVER_RSP: 325 nci_rf_disc_rsp_packet(ndev, skb); 326 break; 327 328 case NCI_OP_RF_DISCOVER_SELECT_RSP: 329 nci_rf_disc_select_rsp_packet(ndev, skb); 330 break; 331 332 case NCI_OP_RF_DEACTIVATE_RSP: 333 nci_rf_deactivate_rsp_packet(ndev, skb); 334 break; 335 336 case NCI_OP_NFCEE_DISCOVER_RSP: 337 nci_nfcee_discover_rsp_packet(ndev, skb); 338 break; 339 340 case NCI_OP_NFCEE_MODE_SET_RSP: 341 nci_nfcee_mode_set_rsp_packet(ndev, skb); 342 break; 343 344 default: 345 pr_err("unknown rsp opcode 0x%x\n", rsp_opcode); 346 break; 347 } 348 349 kfree_skb(skb); 350 351 /* trigger the next cmd */ 352 atomic_set(&ndev->cmd_cnt, 1); 353 if (!skb_queue_empty(&ndev->cmd_q)) 354 queue_work(ndev->cmd_wq, &ndev->cmd_work); 355 } 356