LXR linux/net/nfc/nci/rsp.c

   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
  40static 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
  55static 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
 117exit:
 118        nci_req_complete(ndev, rsp_1->status);
 119}
 120
 121static 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
 131static 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
 141static 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
 167exit:
 168        nci_req_complete(ndev, status);
 169}
 170
 171static 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
 183static 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
 199static 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
 216static 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
 225static 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
 262exit:
 263        nci_req_complete(ndev, status);
 264}
 265
 266static 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
 283void 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        if (nci_opcode_gid(rsp_opcode) == NCI_GID_PROPRIETARY) {
 300                if (nci_prop_rsp_packet(ndev, rsp_opcode, skb) == -ENOTSUPP) {
 301                        pr_err("unsupported rsp opcode 0x%x\n",
 302                               rsp_opcode);
 303                }
 304
 305                goto end;
 306        }
 307
 308        switch (rsp_opcode) {
 309        case NCI_OP_CORE_RESET_RSP:
 310                nci_core_reset_rsp_packet(ndev, skb);
 311                break;
 312
 313        case NCI_OP_CORE_INIT_RSP:
 314                nci_core_init_rsp_packet(ndev, skb);
 315                break;
 316
 317        case NCI_OP_CORE_SET_CONFIG_RSP:
 318                nci_core_set_config_rsp_packet(ndev, skb);
 319                break;
 320
 321        case NCI_OP_CORE_CONN_CREATE_RSP:
 322                nci_core_conn_create_rsp_packet(ndev, skb);
 323                break;
 324
 325        case NCI_OP_CORE_CONN_CLOSE_RSP:
 326                nci_core_conn_close_rsp_packet(ndev, skb);
 327                break;
 328
 329        case NCI_OP_RF_DISCOVER_MAP_RSP:
 330                nci_rf_disc_map_rsp_packet(ndev, skb);
 331                break;
 332
 333        case NCI_OP_RF_DISCOVER_RSP:
 334                nci_rf_disc_rsp_packet(ndev, skb);
 335                break;
 336
 337        case NCI_OP_RF_DISCOVER_SELECT_RSP:
 338                nci_rf_disc_select_rsp_packet(ndev, skb);
 339                break;
 340
 341        case NCI_OP_RF_DEACTIVATE_RSP:
 342                nci_rf_deactivate_rsp_packet(ndev, skb);
 343                break;
 344
 345        case NCI_OP_NFCEE_DISCOVER_RSP:
 346                nci_nfcee_discover_rsp_packet(ndev, skb);
 347                break;
 348
 349        case NCI_OP_NFCEE_MODE_SET_RSP:
 350                nci_nfcee_mode_set_rsp_packet(ndev, skb);
 351                break;
 352
 353        default:
 354                pr_err("unknown rsp opcode 0x%x\n", rsp_opcode);
 355                break;
 356        }
 357
 358        nci_core_rsp_packet(ndev, rsp_opcode, skb);
 359end:
 360        kfree_skb(skb);
 361
 362        /* trigger the next cmd */
 363        atomic_set(&ndev->cmd_cnt, 1);
 364        if (!skb_queue_empty(&ndev->cmd_q))
 365                queue_work(ndev->cmd_wq, &ndev->cmd_work);
 366}
 367