kernel/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
  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 }