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