include/net/nfc/shdlc.h

   1 /*
   2  * Copyright (C) 2012  Intel Corporation. All rights reserved.
   3  *
   4  * This program is free software; you can redistribute it and/or modify
   5  * it under the terms of the GNU General Public License as published by
   6  * the Free Software Foundation; either version 2 of the License, or
   7  * (at your option) any later version.
   8  *
   9  * This program is distributed in the hope that it will be useful,
  10  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
  12  * GNU General Public License for more details.
  13  *
  14  * You should have received a copy of the GNU General Public License
  15  * along with this program; if not, write to the
  16  * Free Software Foundation, Inc.,
  17  * 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
  18  */
  19
  20 #ifndef __NFC_SHDLC_H
  21 #define __NFC_SHDLC_H
  22
  23 struct nfc_shdlc;
  24
  25 struct nfc_shdlc_ops {
  26         int (*open) (struct nfc_shdlc *shdlc);
  27         void (*close) (struct nfc_shdlc *shdlc);
  28         int (*hci_ready) (struct nfc_shdlc *shdlc);
  29         int (*xmit) (struct nfc_shdlc *shdlc, struct sk_buff *skb);
  30         int (*start_poll) (struct nfc_shdlc *shdlc,
  31                            u32 im_protocols, u32 tm_protocols);
  32         int (*target_from_gate) (struct nfc_shdlc *shdlc, u8 gate,
  33                                  struct nfc_target *target);
  34         int (*complete_target_discovered) (struct nfc_shdlc *shdlc, u8 gate,
  35                                            struct nfc_target *target);
  36         int (*data_exchange) (struct nfc_shdlc *shdlc,
  37                               struct nfc_target *target,
  38                               struct sk_buff *skb, struct sk_buff **res_skb);
  39         int (*check_presence)(struct nfc_shdlc *shdlc,
  40                               struct nfc_target *target);
  41 };
  42
  43 enum shdlc_state {
  44         SHDLC_DISCONNECTED = 0,
  45         SHDLC_CONNECTING = 1,
  46         SHDLC_NEGOCIATING = 2,
  47         SHDLC_CONNECTED = 3
  48 };
  49
  50 struct nfc_shdlc {
  51         struct mutex state_mutex;
  52         enum shdlc_state state;
  53         int hard_fault;
  54
  55         struct nfc_hci_dev *hdev;
  56
  57         wait_queue_head_t *connect_wq;
  58         int connect_tries;
  59         int connect_result;
  60         struct timer_list connect_timer;/* aka T3 in spec 10.6.1 */
  61
  62         u8 w;                           /* window size */
  63         bool srej_support;
  64
  65         struct timer_list t1_timer;     /* send ack timeout */
  66         bool t1_active;
  67
  68         struct timer_list t2_timer;     /* guard/retransmit timeout */
  69         bool t2_active;
  70
  71         int ns;                         /* next seq num for send */
  72         int nr;                         /* next expected seq num for receive */
  73         int dnr;                        /* oldest sent unacked seq num */
  74
  75         struct sk_buff_head rcv_q;
  76
  77         struct sk_buff_head send_q;
  78         bool rnr;                       /* other side is not ready to receive */
  79
  80         struct sk_buff_head ack_pending_q;
  81
  82         struct workqueue_struct *sm_wq;
  83         struct work_struct sm_work;
  84
  85         struct nfc_shdlc_ops *ops;
  86
  87         int client_headroom;
  88         int client_tailroom;
  89
  90         void *clientdata;
  91 };
  92
  93 void nfc_shdlc_recv_frame(struct nfc_shdlc *shdlc, struct sk_buff *skb);
  94
  95 struct nfc_shdlc *nfc_shdlc_allocate(struct nfc_shdlc_ops *ops,
  96                                      struct nfc_hci_init_data *init_data,
  97                                      u32 protocols,
  98                                      int tx_headroom, int tx_tailroom,
  99                                      int max_link_payload, const char *devname);
 100
 101 void nfc_shdlc_free(struct nfc_shdlc *shdlc);
 102
 103 void nfc_shdlc_set_clientdata(struct nfc_shdlc *shdlc, void *clientdata);
 104 void *nfc_shdlc_get_clientdata(struct nfc_shdlc *shdlc);
 105 struct nfc_hci_dev *nfc_shdlc_get_hci_dev(struct nfc_shdlc *shdlc);
 106
 107 #endif /* __NFC_SHDLC_H */