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 =
  82                 rsp_2->max_logical_connections;
  83         ndev->max_routing_table_size =
  84                 __le16_to_cpu(rsp_2->max_routing_table_size);
  85         ndev->max_ctrl_pkt_payload_len =
  86                 rsp_2->max_ctrl_pkt_payload_len;
  87         ndev->max_size_for_large_params =
  88                 __le16_to_cpu(rsp_2->max_size_for_large_params);
  89         ndev->manufact_id =
  90                 rsp_2->manufact_id;
  91         ndev->manufact_specific_info =
  92                 __le32_to_cpu(rsp_2->manufact_specific_info);
  93
  94         pr_debug("nfcc_features 0x%x\n",
  95                  ndev->nfcc_features);
  96         pr_debug("num_supported_rf_interfaces %d\n",
  97                  ndev->num_supported_rf_interfaces);
  98         pr_debug("supported_rf_interfaces[0] 0x%x\n",
  99                  ndev->supported_rf_interfaces[0]);
 100         pr_debug("supported_rf_interfaces[1] 0x%x\n",
 101                  ndev->supported_rf_interfaces[1]);
 102         pr_debug("supported_rf_interfaces[2] 0x%x\n",
 103                  ndev->supported_rf_interfaces[2]);
 104         pr_debug("supported_rf_interfaces[3] 0x%x\n",
 105                  ndev->supported_rf_interfaces[3]);
 106         pr_debug("max_logical_connections %d\n",
 107                  ndev->max_logical_connections);
 108         pr_debug("max_routing_table_size %d\n",
 109                  ndev->max_routing_table_size);
 110         pr_debug("max_ctrl_pkt_payload_len %d\n",
 111                  ndev->max_ctrl_pkt_payload_len);
 112         pr_debug("max_size_for_large_params %d\n",
 113                  ndev->max_size_for_large_params);
 114         pr_debug("manufact_id 0x%x\n",
 115                  ndev->manufact_id);
 116         pr_debug("manufact_specific_info 0x%x\n",
 117                  ndev->manufact_specific_info);
 118
 119 exit:
 120         nci_req_complete(ndev, rsp_1->status);
 121 }
 122
 123 static void nci_rf_disc_map_rsp_packet(struct nci_dev *ndev,
 124                                         struct sk_buff *skb)
 125 {
 126         __u8 status = skb->data[0];
 127
 128         pr_debug("status 0x%x\n", status);
 129
 130         nci_req_complete(ndev, status);
 131 }
 132
 133 static void nci_rf_disc_rsp_packet(struct nci_dev *ndev, struct sk_buff *skb)
 134 {
 135         __u8 status = skb->data[0];
 136
 137         pr_debug("status 0x%x\n", status);
 138
 139         if (status == NCI_STATUS_OK)
 140                 set_bit(NCI_DISCOVERY, &ndev->flags);
 141
 142         nci_req_complete(ndev, status);
 143 }
 144
 145 static void nci_rf_deactivate_rsp_packet(struct nci_dev *ndev,
 146                                         struct sk_buff *skb)
 147 {
 148         __u8 status = skb->data[0];
 149
 150         pr_debug("status 0x%x\n", status);
 151
 152         clear_bit(NCI_DISCOVERY, &ndev->flags);
 153
 154         nci_req_complete(ndev, status);
 155 }
 156
 157 void nci_rsp_packet(struct nci_dev *ndev, struct sk_buff *skb)
 158 {
 159         __u16 rsp_opcode = nci_opcode(skb->data);
 160
 161         /* we got a rsp, stop the cmd timer */
 162         del_timer(&ndev->cmd_timer);
 163
 164         pr_debug("NCI RX: MT=rsp, PBF=%d, GID=0x%x, OID=0x%x, plen=%d\n",
 165                  nci_pbf(skb->data),
 166                  nci_opcode_gid(rsp_opcode),
 167                  nci_opcode_oid(rsp_opcode),
 168                  nci_plen(skb->data));
 169
 170         /* strip the nci control header */
 171         skb_pull(skb, NCI_CTRL_HDR_SIZE);
 172
 173         switch (rsp_opcode) {
 174         case NCI_OP_CORE_RESET_RSP:
 175                 nci_core_reset_rsp_packet(ndev, skb);
 176                 break;
 177
 178         case NCI_OP_CORE_INIT_RSP:
 179                 nci_core_init_rsp_packet(ndev, skb);
 180                 break;
 181
 182         case NCI_OP_RF_DISCOVER_MAP_RSP:
 183                 nci_rf_disc_map_rsp_packet(ndev, skb);
 184                 break;
 185
 186         case NCI_OP_RF_DISCOVER_RSP:
 187                 nci_rf_disc_rsp_packet(ndev, skb);
 188                 break;
 189
 190         case NCI_OP_RF_DEACTIVATE_RSP:
 191                 nci_rf_deactivate_rsp_packet(ndev, skb);
 192                 break;
 193
 194         default:
 195                 pr_err("unknown rsp opcode 0x%x\n", rsp_opcode);
 196                 break;
 197         }
 198
 199         kfree_skb(skb);
 200
 201         /* trigger the next cmd */
 202         atomic_set(&ndev->cmd_cnt, 1);
 203         if (!skb_queue_empty(&ndev->cmd_q))
 204                 queue_work(ndev->cmd_wq, &ndev->cmd_work);
 205 }