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 ": " fmt
  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         nfc_dbg("entry, status 0x%x", rsp->status);
  46
  47         if (rsp->status == NCI_STATUS_OK) {
  48                 ndev->nci_ver = rsp->nci_ver;
  49                 nfc_dbg("nci_ver 0x%x, config_status 0x%x",
  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         nfc_dbg("entry, status 0x%x", 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->max_data_pkt_payload_size =
  90                 rsp_2->max_data_pkt_payload_size;
  91         ndev->initial_num_credits =
  92                 rsp_2->initial_num_credits;
  93         ndev->manufact_id =
  94                 rsp_2->manufact_id;
  95         ndev->manufact_specific_info =
  96                 __le32_to_cpu(rsp_2->manufact_specific_info);
  97
  98         atomic_set(&ndev->credits_cnt, ndev->initial_num_credits);
  99
 100         nfc_dbg("nfcc_features 0x%x",
 101                 ndev->nfcc_features);
 102         nfc_dbg("num_supported_rf_interfaces %d",
 103                 ndev->num_supported_rf_interfaces);
 104         nfc_dbg("supported_rf_interfaces[0] 0x%x",
 105                 ndev->supported_rf_interfaces[0]);
 106         nfc_dbg("supported_rf_interfaces[1] 0x%x",
 107                 ndev->supported_rf_interfaces[1]);
 108         nfc_dbg("supported_rf_interfaces[2] 0x%x",
 109                 ndev->supported_rf_interfaces[2]);
 110         nfc_dbg("supported_rf_interfaces[3] 0x%x",
 111                 ndev->supported_rf_interfaces[3]);
 112         nfc_dbg("max_logical_connections %d",
 113                 ndev->max_logical_connections);
 114         nfc_dbg("max_routing_table_size %d",
 115                 ndev->max_routing_table_size);
 116         nfc_dbg("max_ctrl_pkt_payload_len %d",
 117                 ndev->max_ctrl_pkt_payload_len);
 118         nfc_dbg("max_size_for_large_params %d",
 119                 ndev->max_size_for_large_params);
 120         nfc_dbg("max_data_pkt_payload_size %d",
 121                 ndev->max_data_pkt_payload_size);
 122         nfc_dbg("initial_num_credits %d",
 123                 ndev->initial_num_credits);
 124         nfc_dbg("manufact_id 0x%x",
 125                 ndev->manufact_id);
 126         nfc_dbg("manufact_specific_info 0x%x",
 127                 ndev->manufact_specific_info);
 128
 129 exit:
 130         nci_req_complete(ndev, rsp_1->status);
 131 }
 132
 133 static void nci_rf_disc_map_rsp_packet(struct nci_dev *ndev,
 134                                         struct sk_buff *skb)
 135 {
 136         __u8 status = skb->data[0];
 137
 138         nfc_dbg("entry, status 0x%x", status);
 139
 140         nci_req_complete(ndev, status);
 141 }
 142
 143 static void nci_rf_disc_rsp_packet(struct nci_dev *ndev, struct sk_buff *skb)
 144 {
 145         __u8 status = skb->data[0];
 146
 147         nfc_dbg("entry, status 0x%x", status);
 148
 149         if (status == NCI_STATUS_OK)
 150                 set_bit(NCI_DISCOVERY, &ndev->flags);
 151
 152         nci_req_complete(ndev, status);
 153 }
 154
 155 static void nci_rf_deactivate_rsp_packet(struct nci_dev *ndev,
 156                                         struct sk_buff *skb)
 157 {
 158         __u8 status = skb->data[0];
 159
 160         nfc_dbg("entry, status 0x%x", status);
 161
 162         clear_bit(NCI_DISCOVERY, &ndev->flags);
 163
 164         nci_req_complete(ndev, status);
 165 }
 166
 167 void nci_rsp_packet(struct nci_dev *ndev, struct sk_buff *skb)
 168 {
 169         __u16 rsp_opcode = nci_opcode(skb->data);
 170
 171         /* we got a rsp, stop the cmd timer */
 172         del_timer(&ndev->cmd_timer);
 173
 174         nfc_dbg("NCI RX: MT=rsp, PBF=%d, GID=0x%x, OID=0x%x, plen=%d",
 175                         nci_pbf(skb->data),
 176                         nci_opcode_gid(rsp_opcode),
 177                         nci_opcode_oid(rsp_opcode),
 178                         nci_plen(skb->data));
 179
 180         /* strip the nci control header */
 181         skb_pull(skb, NCI_CTRL_HDR_SIZE);
 182
 183         switch (rsp_opcode) {
 184         case NCI_OP_CORE_RESET_RSP:
 185                 nci_core_reset_rsp_packet(ndev, skb);
 186                 break;
 187
 188         case NCI_OP_CORE_INIT_RSP:
 189                 nci_core_init_rsp_packet(ndev, skb);
 190                 break;
 191
 192         case NCI_OP_RF_DISCOVER_MAP_RSP:
 193                 nci_rf_disc_map_rsp_packet(ndev, skb);
 194                 break;
 195
 196         case NCI_OP_RF_DISCOVER_RSP:
 197                 nci_rf_disc_rsp_packet(ndev, skb);
 198                 break;
 199
 200         case NCI_OP_RF_DEACTIVATE_RSP:
 201                 nci_rf_deactivate_rsp_packet(ndev, skb);
 202                 break;
 203
 204         default:
 205                 pr_err("unknown rsp opcode 0x%x\n", rsp_opcode);
 206                 break;
 207         }
 208
 209         kfree_skb(skb);
 210
 211         /* trigger the next cmd */
 212         atomic_set(&ndev->cmd_cnt, 1);
 213         if (!skb_queue_empty(&ndev->cmd_q))
 214                 queue_work(ndev->cmd_wq, &ndev->cmd_work);
 215 }