include/net/nfc/nci_core.h

   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_core.h, 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 #ifndef __NCI_CORE_H
  29 #define __NCI_CORE_H
  30
  31 #include <linux/interrupt.h>
  32 #include <linux/skbuff.h>
  33
  34 #include <net/nfc/nfc.h>
  35 #include <net/nfc/nci.h>
  36
  37 /* NCI device state */
  38 enum {
  39         NCI_INIT,
  40         NCI_UP,
  41         NCI_DISCOVERY,
  42         NCI_POLL_ACTIVE,
  43         NCI_DATA_EXCHANGE,
  44 };
  45
  46 /* NCI timeouts */
  47 #define NCI_RESET_TIMEOUT                       5000
  48 #define NCI_INIT_TIMEOUT                        5000
  49 #define NCI_RF_DISC_TIMEOUT                     5000
  50 #define NCI_RF_DEACTIVATE_TIMEOUT               5000
  51 #define NCI_CMD_TIMEOUT                         5000
  52
  53 struct nci_dev;
  54
  55 struct nci_ops {
  56         int (*open)(struct nci_dev *ndev);
  57         int (*close)(struct nci_dev *ndev);
  58         int (*send)(struct sk_buff *skb);
  59 };
  60
  61 #define NCI_MAX_SUPPORTED_RF_INTERFACES         4
  62
  63 /* NCI Core structures */
  64 struct nci_dev {
  65         struct nfc_dev          *nfc_dev;
  66         struct nci_ops          *ops;
  67
  68         int                     tx_headroom;
  69         int                     tx_tailroom;
  70
  71         unsigned long           flags;
  72
  73         atomic_t                cmd_cnt;
  74         atomic_t                credits_cnt;
  75
  76         struct timer_list       cmd_timer;
  77
  78         struct workqueue_struct *cmd_wq;
  79         struct work_struct      cmd_work;
  80
  81         struct workqueue_struct *rx_wq;
  82         struct work_struct      rx_work;
  83
  84         struct workqueue_struct *tx_wq;
  85         struct work_struct      tx_work;
  86
  87         struct sk_buff_head     cmd_q;
  88         struct sk_buff_head     rx_q;
  89         struct sk_buff_head     tx_q;
  90
  91         struct mutex            req_lock;
  92         struct completion       req_completion;
  93         __u32                   req_status;
  94         __u32                   req_result;
  95
  96         void                    *driver_data;
  97
  98         __u32                   poll_prots;
  99         __u32                   target_available_prots;
 100         __u32                   target_active_prot;
 101
 102         /* received during NCI_OP_CORE_RESET_RSP */
 103         __u8                    nci_ver;
 104
 105         /* received during NCI_OP_CORE_INIT_RSP */
 106         __u32                   nfcc_features;
 107         __u8                    num_supported_rf_interfaces;
 108         __u8                    supported_rf_interfaces
 109                                 [NCI_MAX_SUPPORTED_RF_INTERFACES];
 110         __u8                    max_logical_connections;
 111         __u16                   max_routing_table_size;
 112         __u8                    max_control_packet_payload_length;
 113         __u16                   rf_sending_buffer_size;
 114         __u16                   rf_receiving_buffer_size;
 115         __u16                   manufacturer_id;
 116
 117         /* received during NCI_OP_CORE_CONN_CREATE_RSP for static conn 0 */
 118         __u8                    max_pkt_payload_size;
 119         __u8                    initial_num_credits;
 120         __u8                    conn_id;
 121
 122         /* stored during nci_data_exchange */
 123         data_exchange_cb_t      data_exchange_cb;
 124         void                    *data_exchange_cb_context;
 125         struct sk_buff          *rx_data_reassembly;
 126 };
 127
 128 /* ----- NCI Devices ----- */
 129 struct nci_dev *nci_allocate_device(struct nci_ops *ops,
 130                                 __u32 supported_protocols,
 131                                 int tx_headroom,
 132                                 int tx_tailroom);
 133 void nci_free_device(struct nci_dev *ndev);
 134 int nci_register_device(struct nci_dev *ndev);
 135 void nci_unregister_device(struct nci_dev *ndev);
 136 int nci_recv_frame(struct sk_buff *skb);
 137
 138 static inline struct sk_buff *nci_skb_alloc(struct nci_dev *ndev,
 139                                                 unsigned int len,
 140                                                 gfp_t how)
 141 {
 142         struct sk_buff *skb;
 143
 144         skb = alloc_skb(len + ndev->tx_headroom + ndev->tx_tailroom, how);
 145         if (skb)
 146                 skb_reserve(skb, ndev->tx_headroom);
 147
 148         return skb;
 149 }
 150
 151 static inline void nci_set_parent_dev(struct nci_dev *ndev, struct device *dev)
 152 {
 153         nfc_set_parent_dev(ndev->nfc_dev, dev);
 154 }
 155
 156 static inline void nci_set_drvdata(struct nci_dev *ndev, void *data)
 157 {
 158         ndev->driver_data = data;
 159 }
 160
 161 static inline void *nci_get_drvdata(struct nci_dev *ndev)
 162 {
 163         return ndev->driver_data;
 164 }
 165
 166 void nci_rsp_packet(struct nci_dev *ndev, struct sk_buff *skb);
 167 void nci_ntf_packet(struct nci_dev *ndev, struct sk_buff *skb);
 168 void nci_rx_data_packet(struct nci_dev *ndev, struct sk_buff *skb);
 169 int nci_send_cmd(struct nci_dev *ndev, __u16 opcode, __u8 plen, void *payload);
 170 int nci_send_data(struct nci_dev *ndev, __u8 conn_id, struct sk_buff *skb);
 171 void nci_data_exchange_complete(struct nci_dev *ndev, struct sk_buff *skb,
 172                                 int err);
 173
 174 /* ----- NCI requests ----- */
 175 #define NCI_REQ_DONE            0
 176 #define NCI_REQ_PEND            1
 177 #define NCI_REQ_CANCELED        2
 178
 179 void nci_req_complete(struct nci_dev *ndev, int result);
 180
 181 /* ----- NCI status code ----- */
 182 int nci_to_errno(__u8 code);
 183
 184 #endif /* __NCI_CORE_H */