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 #include <linux/types.h>
  29 #include <linux/interrupt.h>
  30 #include <linux/bitops.h>
  31 #include <linux/skbuff.h>
  32
  33 #include "../nfc.h"
  34 #include <net/nfc/nci.h>
  35 #include <net/nfc/nci_core.h>
  36
  37 /* Handle NCI Response packets */
  38
  39 static void nci_core_reset_rsp_packet(struct nci_dev *ndev, struct sk_buff *skb)
  40 {
  41         struct nci_core_reset_rsp *rsp = (void *) skb->data;
  42
  43         nfc_dbg("entry, status 0x%x", rsp->status);
  44
  45         if (rsp->status == NCI_STATUS_OK)
  46                 ndev->nci_ver = rsp->nci_ver;
  47
  48         nfc_dbg("nci_ver 0x%x", ndev->nci_ver);
  49
  50         nci_req_complete(ndev, rsp->status);
  51 }
  52
  53 static void nci_core_init_rsp_packet(struct nci_dev *ndev, struct sk_buff *skb)
  54 {
  55         struct nci_core_init_rsp_1 *rsp_1 = (void *) skb->data;
  56         struct nci_core_init_rsp_2 *rsp_2;
  57
  58         nfc_dbg("entry, status 0x%x", rsp_1->status);
  59
  60         if (rsp_1->status != NCI_STATUS_OK)
  61                 return;
  62
  63         ndev->nfcc_features = __le32_to_cpu(rsp_1->nfcc_features);
  64         ndev->num_supported_rf_interfaces = rsp_1->num_supported_rf_interfaces;
  65
  66         if (ndev->num_supported_rf_interfaces >
  67                 NCI_MAX_SUPPORTED_RF_INTERFACES) {
  68                 ndev->num_supported_rf_interfaces =
  69                         NCI_MAX_SUPPORTED_RF_INTERFACES;
  70         }
  71
  72         memcpy(ndev->supported_rf_interfaces,
  73                 rsp_1->supported_rf_interfaces,
  74                 ndev->num_supported_rf_interfaces);
  75
  76         rsp_2 = (void *) (skb->data + 6 + ndev->num_supported_rf_interfaces);
  77
  78         ndev->max_logical_connections =
  79                 rsp_2->max_logical_connections;
  80         ndev->max_routing_table_size =
  81                 __le16_to_cpu(rsp_2->max_routing_table_size);
  82         ndev->max_control_packet_payload_length =
  83                 rsp_2->max_control_packet_payload_length;
  84         ndev->rf_sending_buffer_size =
  85                 __le16_to_cpu(rsp_2->rf_sending_buffer_size);
  86         ndev->rf_receiving_buffer_size =
  87                 __le16_to_cpu(rsp_2->rf_receiving_buffer_size);
  88         ndev->manufacturer_id =
  89                 __le16_to_cpu(rsp_2->manufacturer_id);
  90
  91         nfc_dbg("nfcc_features 0x%x",
  92                 ndev->nfcc_features);
  93         nfc_dbg("num_supported_rf_interfaces %d",
  94                 ndev->num_supported_rf_interfaces);
  95         nfc_dbg("supported_rf_interfaces[0] 0x%x",
  96                 ndev->supported_rf_interfaces[0]);
  97         nfc_dbg("supported_rf_interfaces[1] 0x%x",
  98                 ndev->supported_rf_interfaces[1]);
  99         nfc_dbg("supported_rf_interfaces[2] 0x%x",
 100                 ndev->supported_rf_interfaces[2]);
 101         nfc_dbg("supported_rf_interfaces[3] 0x%x",
 102                 ndev->supported_rf_interfaces[3]);
 103         nfc_dbg("max_logical_connections %d",
 104                 ndev->max_logical_connections);
 105         nfc_dbg("max_routing_table_size %d",
 106                 ndev->max_routing_table_size);
 107         nfc_dbg("max_control_packet_payload_length %d",
 108                 ndev->max_control_packet_payload_length);
 109         nfc_dbg("rf_sending_buffer_size %d",
 110                 ndev->rf_sending_buffer_size);
 111         nfc_dbg("rf_receiving_buffer_size %d",
 112                 ndev->rf_receiving_buffer_size);
 113         nfc_dbg("manufacturer_id 0x%x",
 114                 ndev->manufacturer_id);
 115
 116         nci_req_complete(ndev, rsp_1->status);
 117 }
 118
 119 static void nci_core_conn_create_rsp_packet(struct nci_dev *ndev,
 120                                                 struct sk_buff *skb)
 121 {
 122         struct nci_core_conn_create_rsp *rsp = (void *) skb->data;
 123
 124         nfc_dbg("entry, status 0x%x", rsp->status);
 125
 126         if (rsp->status != NCI_STATUS_OK)
 127                 return;
 128
 129         ndev->max_pkt_payload_size = rsp->max_pkt_payload_size;
 130         ndev->initial_num_credits = rsp->initial_num_credits;
 131         ndev->conn_id = rsp->conn_id;
 132
 133         atomic_set(&ndev->credits_cnt, ndev->initial_num_credits);
 134
 135         nfc_dbg("max_pkt_payload_size %d", ndev->max_pkt_payload_size);
 136         nfc_dbg("initial_num_credits %d", ndev->initial_num_credits);
 137         nfc_dbg("conn_id %d", ndev->conn_id);
 138 }
 139
 140 static void nci_rf_disc_map_rsp_packet(struct nci_dev *ndev,
 141                                         struct sk_buff *skb)
 142 {
 143         __u8 status = skb->data[0];
 144
 145         nfc_dbg("entry, status 0x%x", status);
 146
 147         nci_req_complete(ndev, status);
 148 }
 149
 150 static void nci_rf_disc_rsp_packet(struct nci_dev *ndev, struct sk_buff *skb)
 151 {
 152         __u8 status = skb->data[0];
 153
 154         nfc_dbg("entry, status 0x%x", status);
 155
 156         if (status == NCI_STATUS_OK)
 157                 set_bit(NCI_DISCOVERY, &ndev->flags);
 158
 159         nci_req_complete(ndev, status);
 160 }
 161
 162 static void nci_rf_deactivate_rsp_packet(struct nci_dev *ndev,
 163                                         struct sk_buff *skb)
 164 {
 165         __u8 status = skb->data[0];
 166
 167         nfc_dbg("entry, status 0x%x", status);
 168
 169         clear_bit(NCI_DISCOVERY, &ndev->flags);
 170
 171         nci_req_complete(ndev, status);
 172 }
 173
 174 void nci_rsp_packet(struct nci_dev *ndev, struct sk_buff *skb)
 175 {
 176         __u16 rsp_opcode = nci_opcode(skb->data);
 177
 178         /* we got a rsp, stop the cmd timer */
 179         del_timer(&ndev->cmd_timer);
 180
 181         nfc_dbg("NCI RX: MT=rsp, PBF=%d, GID=0x%x, OID=0x%x, plen=%d",
 182                         nci_pbf(skb->data),
 183                         nci_opcode_gid(rsp_opcode),
 184                         nci_opcode_oid(rsp_opcode),
 185                         nci_plen(skb->data));
 186
 187         /* strip the nci control header */
 188         skb_pull(skb, NCI_CTRL_HDR_SIZE);
 189
 190         switch (rsp_opcode) {
 191         case NCI_OP_CORE_RESET_RSP:
 192                 nci_core_reset_rsp_packet(ndev, skb);
 193                 break;
 194
 195         case NCI_OP_CORE_INIT_RSP:
 196                 nci_core_init_rsp_packet(ndev, skb);
 197                 break;
 198
 199         case NCI_OP_CORE_CONN_CREATE_RSP:
 200                 nci_core_conn_create_rsp_packet(ndev, skb);
 201                 break;
 202
 203         case NCI_OP_RF_DISCOVER_MAP_RSP:
 204                 nci_rf_disc_map_rsp_packet(ndev, skb);
 205                 break;
 206
 207         case NCI_OP_RF_DISCOVER_RSP:
 208                 nci_rf_disc_rsp_packet(ndev, skb);
 209                 break;
 210
 211         case NCI_OP_RF_DEACTIVATE_RSP:
 212                 nci_rf_deactivate_rsp_packet(ndev, skb);
 213                 break;
 214
 215         default:
 216                 nfc_err("unknown rsp opcode 0x%x", rsp_opcode);
 217                 break;
 218         }
 219
 220         kfree_skb(skb);
 221
 222         /* trigger the next cmd */
 223         atomic_set(&ndev->cmd_cnt, 1);
 224         if (!skb_queue_empty(&ndev->cmd_q))
 225                 queue_work(ndev->cmd_wq, &ndev->cmd_work);
 226 }