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, write to the Free Software
  24  *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  25  *
  26  */
  27
  28 #define pr_fmt(fmt) KBUILD_MODNAME ": %s: " fmt, __func__
  29
  30 #include <linux/types.h>
  31 #include <linux/interrupt.h>
  32 #include <linux/bitops.h>
  33 #include <linux/skbuff.h>
  34
  35 #include "../nfc.h"
  36 #include <net/nfc/nci.h>
  37 #include <net/nfc/nci_core.h>
  38
  39 /* Handle NCI Response packets */
  40
  41 static void nci_core_reset_rsp_packet(struct nci_dev *ndev, struct sk_buff *skb)
  42 {
  43         struct nci_core_reset_rsp *rsp = (void *) skb->data;
  44
  45         pr_debug("status 0x%x\n", rsp->status);
  46
  47         if (rsp->status == NCI_STATUS_OK) {
  48                 ndev->nci_ver = rsp->nci_ver;
  49                 pr_debug("nci_ver 0x%x, config_status 0x%x\n",
  50                          rsp->nci_ver, rsp->config_status);
  51         }
  52
  53         nci_req_complete(ndev, rsp->status);
  54 }
  55
  56 static void nci_core_init_rsp_packet(struct nci_dev *ndev, struct sk_buff *skb)
  57 {
  58         struct nci_core_init_rsp_1 *rsp_1 = (void *) skb->data;
  59         struct nci_core_init_rsp_2 *rsp_2;
  60
  61         pr_debug("status 0x%x\n", rsp_1->status);
  62
  63         if (rsp_1->status != NCI_STATUS_OK)
  64                 goto exit;
  65
  66         ndev->nfcc_features = __le32_to_cpu(rsp_1->nfcc_features);
  67         ndev->num_supported_rf_interfaces = rsp_1->num_supported_rf_interfaces;
  68
  69         if (ndev->num_supported_rf_interfaces >
  70             NCI_MAX_SUPPORTED_RF_INTERFACES) {
  71                 ndev->num_supported_rf_interfaces =
  72                         NCI_MAX_SUPPORTED_RF_INTERFACES;
  73         }
  74
  75         memcpy(ndev->supported_rf_interfaces,
  76                rsp_1->supported_rf_interfaces,
  77                ndev->num_supported_rf_interfaces);
  78
  79         rsp_2 = (void *) (skb->data + 6 + rsp_1->num_supported_rf_interfaces);
  80
  81         ndev->max_logical_connections = rsp_2->max_logical_connections;
  82         ndev->max_routing_table_size =
  83                 __le16_to_cpu(rsp_2->max_routing_table_size);
  84         ndev->max_ctrl_pkt_payload_len =
  85                 rsp_2->max_ctrl_pkt_payload_len;
  86         ndev->max_size_for_large_params =
  87                 __le16_to_cpu(rsp_2->max_size_for_large_params);
  88         ndev->manufact_id =
  89                 rsp_2->manufact_id;
  90         ndev->manufact_specific_info =
  91                 __le32_to_cpu(rsp_2->manufact_specific_info);
  92
  93         pr_debug("nfcc_features 0x%x\n",
  94                  ndev->nfcc_features);
  95         pr_debug("num_supported_rf_interfaces %d\n",
  96                  ndev->num_supported_rf_interfaces);
  97         pr_debug("supported_rf_interfaces[0] 0x%x\n",
  98                  ndev->supported_rf_interfaces[0]);
  99         pr_debug("supported_rf_interfaces[1] 0x%x\n",
 100                  ndev->supported_rf_interfaces[1]);
 101         pr_debug("supported_rf_interfaces[2] 0x%x\n",
 102                  ndev->supported_rf_interfaces[2]);
 103         pr_debug("supported_rf_interfaces[3] 0x%x\n",
 104                  ndev->supported_rf_interfaces[3]);
 105         pr_debug("max_logical_connections %d\n",
 106                  ndev->max_logical_connections);
 107         pr_debug("max_routing_table_size %d\n",
 108                  ndev->max_routing_table_size);
 109         pr_debug("max_ctrl_pkt_payload_len %d\n",
 110                  ndev->max_ctrl_pkt_payload_len);
 111         pr_debug("max_size_for_large_params %d\n",
 112                  ndev->max_size_for_large_params);
 113         pr_debug("manufact_id 0x%x\n",
 114                  ndev->manufact_id);
 115         pr_debug("manufact_specific_info 0x%x\n",
 116                  ndev->manufact_specific_info);
 117
 118 exit:
 119         nci_req_complete(ndev, rsp_1->status);
 120 }
 121
 122 static void nci_rf_disc_map_rsp_packet(struct nci_dev *ndev,
 123                                        struct sk_buff *skb)
 124 {
 125         __u8 status = skb->data[0];
 126
 127         pr_debug("status 0x%x\n", status);
 128
 129         nci_req_complete(ndev, status);
 130 }
 131
 132 static void nci_rf_disc_rsp_packet(struct nci_dev *ndev, struct sk_buff *skb)
 133 {
 134         __u8 status = skb->data[0];
 135
 136         pr_debug("status 0x%x\n", status);
 137
 138         if (status == NCI_STATUS_OK)
 139                 atomic_set(&ndev->state, NCI_DISCOVERY);
 140
 141         nci_req_complete(ndev, status);
 142 }
 143
 144 static void nci_rf_disc_select_rsp_packet(struct nci_dev *ndev,
 145                                           struct sk_buff *skb)
 146 {
 147         __u8 status = skb->data[0];
 148
 149         pr_debug("status 0x%x\n", status);
 150
 151         /* Complete the request on intf_activated_ntf or generic_error_ntf */
 152         if (status != NCI_STATUS_OK)
 153                 nci_req_complete(ndev, status);
 154 }
 155
 156 static void nci_rf_deactivate_rsp_packet(struct nci_dev *ndev,
 157                                          struct sk_buff *skb)
 158 {
 159         __u8 status = skb->data[0];
 160
 161         pr_debug("status 0x%x\n", status);
 162
 163         /* If target was active, complete the request only in deactivate_ntf */
 164         if ((status != NCI_STATUS_OK) ||
 165             (atomic_read(&ndev->state) != NCI_POLL_ACTIVE)) {
 166                 nci_clear_target_list(ndev);
 167                 atomic_set(&ndev->state, NCI_IDLE);
 168                 nci_req_complete(ndev, status);
 169         }
 170 }
 171
 172 void nci_rsp_packet(struct nci_dev *ndev, struct sk_buff *skb)
 173 {
 174         __u16 rsp_opcode = nci_opcode(skb->data);
 175
 176         /* we got a rsp, stop the cmd timer */
 177         del_timer(&ndev->cmd_timer);
 178
 179         pr_debug("NCI RX: MT=rsp, PBF=%d, GID=0x%x, OID=0x%x, plen=%d\n",
 180                  nci_pbf(skb->data),
 181                  nci_opcode_gid(rsp_opcode),
 182                  nci_opcode_oid(rsp_opcode),
 183                  nci_plen(skb->data));
 184
 185         /* strip the nci control header */
 186         skb_pull(skb, NCI_CTRL_HDR_SIZE);
 187
 188         switch (rsp_opcode) {
 189         case NCI_OP_CORE_RESET_RSP:
 190                 nci_core_reset_rsp_packet(ndev, skb);
 191                 break;
 192
 193         case NCI_OP_CORE_INIT_RSP:
 194                 nci_core_init_rsp_packet(ndev, skb);
 195                 break;
 196
 197         case NCI_OP_RF_DISCOVER_MAP_RSP:
 198                 nci_rf_disc_map_rsp_packet(ndev, skb);
 199                 break;
 200
 201         case NCI_OP_RF_DISCOVER_RSP:
 202                 nci_rf_disc_rsp_packet(ndev, skb);
 203                 break;
 204
 205         case NCI_OP_RF_DISCOVER_SELECT_RSP:
 206                 nci_rf_disc_select_rsp_packet(ndev, skb);
 207                 break;
 208
 209         case NCI_OP_RF_DEACTIVATE_RSP:
 210                 nci_rf_deactivate_rsp_packet(ndev, skb);
 211                 break;
 212
 213         default:
 214                 pr_err("unknown rsp opcode 0x%x\n", rsp_opcode);
 215                 break;
 216         }
 217
 218         kfree_skb(skb);
 219
 220         /* trigger the next cmd */
 221         atomic_set(&ndev->cmd_cnt, 1);
 222         if (!skb_queue_empty(&ndev->cmd_q))
 223                 queue_work(ndev->cmd_wq, &ndev->cmd_work);
 224 }