net/nfc/nci/rsp.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  *  The NFC Controller Interface is the communication protocol between an
   4  *  NFC Controller (NFCC) and a Device Host (DH).
   5  *
   6  *  Copyright (C) 2011 Texas Instruments, Inc.
   7  *
   8  *  Written by Ilan Elias <ilane@ti.com>
   9  *
  10  *  Acknowledgements:
  11  *  This file is based on hci_event.c, which was written
  12  *  by Maxim Krasnyansky.
  13  */
  14
  15 #define pr_fmt(fmt) KBUILD_MODNAME ": %s: " fmt, __func__
  16
  17 #include <linux/types.h>
  18 #include <linux/interrupt.h>
  19 #include <linux/bitops.h>
  20 #include <linux/skbuff.h>
  21
  22 #include "../nfc.h"
  23 #include <net/nfc/nci.h>
  24 #include <net/nfc/nci_core.h>
  25
  26 /* Handle NCI Response packets */
  27
  28 static void nci_core_reset_rsp_packet(struct nci_dev *ndev,
  29                                       const struct sk_buff *skb)
  30 {
  31         const struct nci_core_reset_rsp *rsp = (void *)skb->data;
  32
  33         pr_debug("status 0x%x\n", rsp->status);
  34
  35         /* Handle NCI 1.x ver */
  36         if (skb->len != 1) {
  37                 if (rsp->status == NCI_STATUS_OK) {
  38                         ndev->nci_ver = rsp->nci_ver;
  39                         pr_debug("nci_ver 0x%x, config_status 0x%x\n",
  40                                  rsp->nci_ver, rsp->config_status);
  41                 }
  42
  43                 nci_req_complete(ndev, rsp->status);
  44         }
  45 }
  46
  47 static u8 nci_core_init_rsp_packet_v1(struct nci_dev *ndev,
  48                                       const struct sk_buff *skb)
  49 {
  50         const struct nci_core_init_rsp_1 *rsp_1 = (void *)skb->data;
  51         const struct nci_core_init_rsp_2 *rsp_2;
  52
  53         pr_debug("status 0x%x\n", rsp_1->status);
  54
  55         if (rsp_1->status != NCI_STATUS_OK)
  56                 return rsp_1->status;
  57
  58         ndev->nfcc_features = __le32_to_cpu(rsp_1->nfcc_features);
  59         ndev->num_supported_rf_interfaces = rsp_1->num_supported_rf_interfaces;
  60
  61         ndev->num_supported_rf_interfaces =
  62                 min((int)ndev->num_supported_rf_interfaces,
  63                     NCI_MAX_SUPPORTED_RF_INTERFACES);
  64
  65         memcpy(ndev->supported_rf_interfaces,
  66                rsp_1->supported_rf_interfaces,
  67                ndev->num_supported_rf_interfaces);
  68
  69         rsp_2 = (void *) (skb->data + 6 + rsp_1->num_supported_rf_interfaces);
  70
  71         ndev->max_logical_connections = rsp_2->max_logical_connections;
  72         ndev->max_routing_table_size =
  73                 __le16_to_cpu(rsp_2->max_routing_table_size);
  74         ndev->max_ctrl_pkt_payload_len =
  75                 rsp_2->max_ctrl_pkt_payload_len;
  76         ndev->max_size_for_large_params =
  77                 __le16_to_cpu(rsp_2->max_size_for_large_params);
  78         ndev->manufact_id =
  79                 rsp_2->manufact_id;
  80         ndev->manufact_specific_info =
  81                 __le32_to_cpu(rsp_2->manufact_specific_info);
  82
  83         return NCI_STATUS_OK;
  84 }
  85
  86 static u8 nci_core_init_rsp_packet_v2(struct nci_dev *ndev,
  87                                       const struct sk_buff *skb)
  88 {
  89         const struct nci_core_init_rsp_nci_ver2 *rsp = (void *)skb->data;
  90         const u8 *supported_rf_interface = rsp->supported_rf_interfaces;
  91         u8 rf_interface_idx = 0;
  92         u8 rf_extension_cnt = 0;
  93
  94         pr_debug("status %x\n", rsp->status);
  95
  96         if (rsp->status != NCI_STATUS_OK)
  97                 return rsp->status;
  98
  99         ndev->nfcc_features = __le32_to_cpu(rsp->nfcc_features);
 100         ndev->num_supported_rf_interfaces = rsp->num_supported_rf_interfaces;
 101
 102         ndev->num_supported_rf_interfaces =
 103                 min((int)ndev->num_supported_rf_interfaces,
 104                     NCI_MAX_SUPPORTED_RF_INTERFACES);
 105
 106         while (rf_interface_idx < ndev->num_supported_rf_interfaces) {
 107                 ndev->supported_rf_interfaces[rf_interface_idx++] = *supported_rf_interface++;
 108
 109                 /* skip rf extension parameters */
 110                 rf_extension_cnt = *supported_rf_interface++;
 111                 supported_rf_interface += rf_extension_cnt;
 112         }
 113
 114         ndev->max_logical_connections = rsp->max_logical_connections;
 115         ndev->max_routing_table_size =
 116                         __le16_to_cpu(rsp->max_routing_table_size);
 117         ndev->max_ctrl_pkt_payload_len =
 118                         rsp->max_ctrl_pkt_payload_len;
 119         ndev->max_size_for_large_params = NCI_MAX_LARGE_PARAMS_NCI_v2;
 120
 121         return NCI_STATUS_OK;
 122 }
 123
 124 static void nci_core_init_rsp_packet(struct nci_dev *ndev, const struct sk_buff *skb)
 125 {
 126         u8 status = 0;
 127
 128         if (!(ndev->nci_ver & NCI_VER_2_MASK))
 129                 status = nci_core_init_rsp_packet_v1(ndev, skb);
 130         else
 131                 status = nci_core_init_rsp_packet_v2(ndev, skb);
 132
 133         if (status != NCI_STATUS_OK)
 134                 goto exit;
 135
 136         pr_debug("nfcc_features 0x%x\n",
 137                  ndev->nfcc_features);
 138         pr_debug("num_supported_rf_interfaces %d\n",
 139                  ndev->num_supported_rf_interfaces);
 140         pr_debug("supported_rf_interfaces[0] 0x%x\n",
 141                  ndev->supported_rf_interfaces[0]);
 142         pr_debug("supported_rf_interfaces[1] 0x%x\n",
 143                  ndev->supported_rf_interfaces[1]);
 144         pr_debug("supported_rf_interfaces[2] 0x%x\n",
 145                  ndev->supported_rf_interfaces[2]);
 146         pr_debug("supported_rf_interfaces[3] 0x%x\n",
 147                  ndev->supported_rf_interfaces[3]);
 148         pr_debug("max_logical_connections %d\n",
 149                  ndev->max_logical_connections);
 150         pr_debug("max_routing_table_size %d\n",
 151                  ndev->max_routing_table_size);
 152         pr_debug("max_ctrl_pkt_payload_len %d\n",
 153                  ndev->max_ctrl_pkt_payload_len);
 154         pr_debug("max_size_for_large_params %d\n",
 155                  ndev->max_size_for_large_params);
 156         pr_debug("manufact_id 0x%x\n",
 157                  ndev->manufact_id);
 158         pr_debug("manufact_specific_info 0x%x\n",
 159                  ndev->manufact_specific_info);
 160
 161 exit:
 162         nci_req_complete(ndev, status);
 163 }
 164
 165 static void nci_core_set_config_rsp_packet(struct nci_dev *ndev,
 166                                            const struct sk_buff *skb)
 167 {
 168         const struct nci_core_set_config_rsp *rsp = (void *)skb->data;
 169
 170         pr_debug("status 0x%x\n", rsp->status);
 171
 172         nci_req_complete(ndev, rsp->status);
 173 }
 174
 175 static void nci_rf_disc_map_rsp_packet(struct nci_dev *ndev,
 176                                        const struct sk_buff *skb)
 177 {
 178         __u8 status = skb->data[0];
 179
 180         pr_debug("status 0x%x\n", status);
 181
 182         nci_req_complete(ndev, status);
 183 }
 184
 185 static void nci_rf_disc_rsp_packet(struct nci_dev *ndev,
 186                                    const struct sk_buff *skb)
 187 {
 188         struct nci_conn_info    *conn_info;
 189         __u8 status = skb->data[0];
 190
 191         pr_debug("status 0x%x\n", status);
 192
 193         if (status == NCI_STATUS_OK) {
 194                 atomic_set(&ndev->state, NCI_DISCOVERY);
 195
 196                 conn_info = ndev->rf_conn_info;
 197                 if (!conn_info) {
 198                         conn_info = devm_kzalloc(&ndev->nfc_dev->dev,
 199                                                  sizeof(struct nci_conn_info),
 200                                                  GFP_KERNEL);
 201                         if (!conn_info) {
 202                                 status = NCI_STATUS_REJECTED;
 203                                 goto exit;
 204                         }
 205                         conn_info->conn_id = NCI_STATIC_RF_CONN_ID;
 206                         INIT_LIST_HEAD(&conn_info->list);
 207                         list_add(&conn_info->list, &ndev->conn_info_list);
 208                         ndev->rf_conn_info = conn_info;
 209                 }
 210         }
 211
 212 exit:
 213         nci_req_complete(ndev, status);
 214 }
 215
 216 static void nci_rf_disc_select_rsp_packet(struct nci_dev *ndev,
 217                                           const struct sk_buff *skb)
 218 {
 219         __u8 status = skb->data[0];
 220
 221         pr_debug("status 0x%x\n", status);
 222
 223         /* Complete the request on intf_activated_ntf or generic_error_ntf */
 224         if (status != NCI_STATUS_OK)
 225                 nci_req_complete(ndev, status);
 226 }
 227
 228 static void nci_rf_deactivate_rsp_packet(struct nci_dev *ndev,
 229                                          const struct sk_buff *skb)
 230 {
 231         __u8 status = skb->data[0];
 232
 233         pr_debug("status 0x%x\n", status);
 234
 235         /* If target was active, complete the request only in deactivate_ntf */
 236         if ((status != NCI_STATUS_OK) ||
 237             (atomic_read(&ndev->state) != NCI_POLL_ACTIVE)) {
 238                 nci_clear_target_list(ndev);
 239                 atomic_set(&ndev->state, NCI_IDLE);
 240                 nci_req_complete(ndev, status);
 241         }
 242 }
 243
 244 static void nci_nfcee_discover_rsp_packet(struct nci_dev *ndev,
 245                                           const struct sk_buff *skb)
 246 {
 247         const struct nci_nfcee_discover_rsp *discover_rsp;
 248
 249         if (skb->len != 2) {
 250                 nci_req_complete(ndev, NCI_STATUS_NFCEE_PROTOCOL_ERROR);
 251                 return;
 252         }
 253
 254         discover_rsp = (struct nci_nfcee_discover_rsp *)skb->data;
 255
 256         if (discover_rsp->status != NCI_STATUS_OK ||
 257             discover_rsp->num_nfcee == 0)
 258                 nci_req_complete(ndev, discover_rsp->status);
 259 }
 260
 261 static void nci_nfcee_mode_set_rsp_packet(struct nci_dev *ndev,
 262                                           const struct sk_buff *skb)
 263 {
 264         __u8 status = skb->data[0];
 265
 266         pr_debug("status 0x%x\n", status);
 267         nci_req_complete(ndev, status);
 268 }
 269
 270 static void nci_core_conn_create_rsp_packet(struct nci_dev *ndev,
 271                                             const struct sk_buff *skb)
 272 {
 273         __u8 status = skb->data[0];
 274         struct nci_conn_info *conn_info = NULL;
 275         const struct nci_core_conn_create_rsp *rsp;
 276
 277         pr_debug("status 0x%x\n", status);
 278
 279         if (status == NCI_STATUS_OK) {
 280                 rsp = (struct nci_core_conn_create_rsp *)skb->data;
 281
 282                 conn_info = devm_kzalloc(&ndev->nfc_dev->dev,
 283                                          sizeof(*conn_info), GFP_KERNEL);
 284                 if (!conn_info) {
 285                         status = NCI_STATUS_REJECTED;
 286                         goto exit;
 287                 }
 288
 289                 conn_info->dest_params = devm_kzalloc(&ndev->nfc_dev->dev,
 290                                                 sizeof(struct dest_spec_params),
 291                                                 GFP_KERNEL);
 292                 if (!conn_info->dest_params) {
 293                         status = NCI_STATUS_REJECTED;
 294                         goto free_conn_info;
 295                 }
 296
 297                 conn_info->dest_type = ndev->cur_dest_type;
 298                 conn_info->dest_params->id = ndev->cur_params.id;
 299                 conn_info->dest_params->protocol = ndev->cur_params.protocol;
 300                 conn_info->conn_id = rsp->conn_id;
 301
 302                 /* Note: data_exchange_cb and data_exchange_cb_context need to
 303                  * be specify out of nci_core_conn_create_rsp_packet
 304                  */
 305
 306                 INIT_LIST_HEAD(&conn_info->list);
 307                 list_add(&conn_info->list, &ndev->conn_info_list);
 308
 309                 if (ndev->cur_params.id == ndev->hci_dev->nfcee_id)
 310                         ndev->hci_dev->conn_info = conn_info;
 311
 312                 conn_info->conn_id = rsp->conn_id;
 313                 conn_info->max_pkt_payload_len = rsp->max_ctrl_pkt_payload_len;
 314                 atomic_set(&conn_info->credits_cnt, rsp->credits_cnt);
 315         }
 316
 317 free_conn_info:
 318         if (status == NCI_STATUS_REJECTED)
 319                 devm_kfree(&ndev->nfc_dev->dev, conn_info);
 320 exit:
 321
 322         nci_req_complete(ndev, status);
 323 }
 324
 325 static void nci_core_conn_close_rsp_packet(struct nci_dev *ndev,
 326                                            const struct sk_buff *skb)
 327 {
 328         struct nci_conn_info *conn_info;
 329         __u8 status = skb->data[0];
 330
 331         pr_debug("status 0x%x\n", status);
 332         if (status == NCI_STATUS_OK) {
 333                 conn_info = nci_get_conn_info_by_conn_id(ndev,
 334                                                          ndev->cur_conn_id);
 335                 if (conn_info) {
 336                         list_del(&conn_info->list);
 337                         devm_kfree(&ndev->nfc_dev->dev, conn_info);
 338                 }
 339         }
 340         nci_req_complete(ndev, status);
 341 }
 342
 343 void nci_rsp_packet(struct nci_dev *ndev, struct sk_buff *skb)
 344 {
 345         __u16 rsp_opcode = nci_opcode(skb->data);
 346
 347         /* we got a rsp, stop the cmd timer */
 348         del_timer(&ndev->cmd_timer);
 349
 350         pr_debug("NCI RX: MT=rsp, PBF=%d, GID=0x%x, OID=0x%x, plen=%d\n",
 351                  nci_pbf(skb->data),
 352                  nci_opcode_gid(rsp_opcode),
 353                  nci_opcode_oid(rsp_opcode),
 354                  nci_plen(skb->data));
 355
 356         /* strip the nci control header */
 357         skb_pull(skb, NCI_CTRL_HDR_SIZE);
 358
 359         if (nci_opcode_gid(rsp_opcode) == NCI_GID_PROPRIETARY) {
 360                 if (nci_prop_rsp_packet(ndev, rsp_opcode, skb) == -ENOTSUPP) {
 361                         pr_err("unsupported rsp opcode 0x%x\n",
 362                                rsp_opcode);
 363                 }
 364
 365                 goto end;
 366         }
 367
 368         switch (rsp_opcode) {
 369         case NCI_OP_CORE_RESET_RSP:
 370                 nci_core_reset_rsp_packet(ndev, skb);
 371                 break;
 372
 373         case NCI_OP_CORE_INIT_RSP:
 374                 nci_core_init_rsp_packet(ndev, skb);
 375                 break;
 376
 377         case NCI_OP_CORE_SET_CONFIG_RSP:
 378                 nci_core_set_config_rsp_packet(ndev, skb);
 379                 break;
 380
 381         case NCI_OP_CORE_CONN_CREATE_RSP:
 382                 nci_core_conn_create_rsp_packet(ndev, skb);
 383                 break;
 384
 385         case NCI_OP_CORE_CONN_CLOSE_RSP:
 386                 nci_core_conn_close_rsp_packet(ndev, skb);
 387                 break;
 388
 389         case NCI_OP_RF_DISCOVER_MAP_RSP:
 390                 nci_rf_disc_map_rsp_packet(ndev, skb);
 391                 break;
 392
 393         case NCI_OP_RF_DISCOVER_RSP:
 394                 nci_rf_disc_rsp_packet(ndev, skb);
 395                 break;
 396
 397         case NCI_OP_RF_DISCOVER_SELECT_RSP:
 398                 nci_rf_disc_select_rsp_packet(ndev, skb);
 399                 break;
 400
 401         case NCI_OP_RF_DEACTIVATE_RSP:
 402                 nci_rf_deactivate_rsp_packet(ndev, skb);
 403                 break;
 404
 405         case NCI_OP_NFCEE_DISCOVER_RSP:
 406                 nci_nfcee_discover_rsp_packet(ndev, skb);
 407                 break;
 408
 409         case NCI_OP_NFCEE_MODE_SET_RSP:
 410                 nci_nfcee_mode_set_rsp_packet(ndev, skb);
 411                 break;
 412
 413         default:
 414                 pr_err("unknown rsp opcode 0x%x\n", rsp_opcode);
 415                 break;
 416         }
 417
 418         nci_core_rsp_packet(ndev, rsp_opcode, skb);
 419 end:
 420         kfree_skb(skb);
 421
 422         /* trigger the next cmd */
 423         atomic_set(&ndev->cmd_cnt, 1);
 424         if (!skb_queue_empty(&ndev->cmd_q))
 425                 queue_work(ndev->cmd_wq, &ndev->cmd_work);
 426 }