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
 23struct nfc_shdlc;
 24
 25struct 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, u32 protocols);
 31	int (*target_from_gate) (struct nfc_shdlc *shdlc, u8 gate,
 32				 struct nfc_target *target);
 33	int (*complete_target_discovered) (struct nfc_shdlc *shdlc, u8 gate,
 34					   struct nfc_target *target);
 35	int (*data_exchange) (struct nfc_shdlc *shdlc,
 36			      struct nfc_target *target,
 37			      struct sk_buff *skb, struct sk_buff **res_skb);
 38	int (*check_presence)(struct nfc_shdlc *shdlc,
 39			      struct nfc_target *target);
 40};
 41
 42enum shdlc_state {
 43	SHDLC_DISCONNECTED = 0,
 44	SHDLC_CONNECTING = 1,
 45	SHDLC_NEGOCIATING = 2,
 46	SHDLC_CONNECTED = 3
 47};
 48
 49struct nfc_shdlc {
 50	struct mutex state_mutex;
 51	enum shdlc_state state;
 52	int hard_fault;
 53
 54	struct nfc_hci_dev *hdev;
 55
 56	wait_queue_head_t *connect_wq;
 57	int connect_tries;
 58	int connect_result;
 59	struct timer_list connect_timer;/* aka T3 in spec 10.6.1 */
 60
 61	u8 w;				/* window size */
 62	bool srej_support;
 63
 64	struct timer_list t1_timer;	/* send ack timeout */
 65	bool t1_active;
 66
 67	struct timer_list t2_timer;	/* guard/retransmit timeout */
 68	bool t2_active;
 69
 70	int ns;				/* next seq num for send */
 71	int nr;				/* next expected seq num for receive */
 72	int dnr;			/* oldest sent unacked seq num */
 73
 74	struct sk_buff_head rcv_q;
 75
 76	struct sk_buff_head send_q;
 77	bool rnr;			/* other side is not ready to receive */
 78
 79	struct sk_buff_head ack_pending_q;
 80
 81	struct workqueue_struct *sm_wq;
 82	struct work_struct sm_work;
 83
 84	struct nfc_shdlc_ops *ops;
 85
 86	int client_headroom;
 87	int client_tailroom;
 88
 89	void *clientdata;
 90};
 91
 92void nfc_shdlc_recv_frame(struct nfc_shdlc *shdlc, struct sk_buff *skb);
 93
 94struct nfc_shdlc *nfc_shdlc_allocate(struct nfc_shdlc_ops *ops,
 95				     struct nfc_hci_init_data *init_data,
 96				     u32 protocols,
 97				     int tx_headroom, int tx_tailroom,
 98				     int max_link_payload, const char *devname);
 99
100void nfc_shdlc_free(struct nfc_shdlc *shdlc);
101
102void nfc_shdlc_set_clientdata(struct nfc_shdlc *shdlc, void *clientdata);
103void *nfc_shdlc_get_clientdata(struct nfc_shdlc *shdlc);
104struct nfc_hci_dev *nfc_shdlc_get_hci_dev(struct nfc_shdlc *shdlc);
105
106#endif /* __NFC_SHDLC_H */