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NFC: SHDLC implementation

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Most NFC HCI chipsets actually use a simplified HDLC link layer to
carry HCI payloads.
This implementation registers itself as an HCI device on behalf of the
NFC driver.

Signed-off-by: Eric Lapuyade <eric.lapuyade@intel.com>
Signed-off-by: Samuel Ortiz <sameo@linux.intel.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
This commit is contained in:
Eric Lapuyade
2012-04-10 19:43:07 +02:00
committed by John W. Linville
parent 8b8d2e08bf
commit eb738fe535
4 changed files with 1058 additions and 0 deletions
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104
include/net/nfc/shdlc.h Normal file
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/*
* Copyright (C) 2012 Intel Corporation. All rights reserved.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the
* Free Software Foundation, Inc.,
* 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
*/
#ifndef __NFC_SHDLC_H
#define __NFC_SHDLC_H
struct nfc_shdlc;
struct nfc_shdlc_ops {
int (*open) (struct nfc_shdlc *shdlc);
void (*close) (struct nfc_shdlc *shdlc);
int (*hci_ready) (struct nfc_shdlc *shdlc);
int (*xmit) (struct nfc_shdlc *shdlc, struct sk_buff *skb);
int (*start_poll) (struct nfc_shdlc *shdlc, u32 protocols);
int (*target_from_gate) (struct nfc_shdlc *shdlc, u8 gate,
struct nfc_target *target);
int (*complete_target_discovered) (struct nfc_shdlc *shdlc, u8 gate,
struct nfc_target *target);
int (*data_exchange) (struct nfc_shdlc *shdlc,
struct nfc_target *target,
struct sk_buff *skb, struct sk_buff **res_skb);
};
enum shdlc_state {
SHDLC_DISCONNECTED = 0,
SHDLC_CONNECTING = 1,
SHDLC_NEGOCIATING = 2,
SHDLC_CONNECTED = 3
};
struct nfc_shdlc {
struct mutex state_mutex;
enum shdlc_state state;
int hard_fault;
struct nfc_hci_dev *hdev;
wait_queue_head_t *connect_wq;
int connect_tries;
int connect_result;
struct timer_list connect_timer;/* aka T3 in spec 10.6.1 */
u8 w; /* window size */
bool srej_support;
struct timer_list t1_timer; /* send ack timeout */
bool t1_active;
struct timer_list t2_timer; /* guard/retransmit timeout */
bool t2_active;
int ns; /* next seq num for send */
int nr; /* next expected seq num for receive */
int dnr; /* oldest sent unacked seq num */
struct sk_buff_head rcv_q;
struct sk_buff_head send_q;
bool rnr; /* other side is not ready to receive */
struct sk_buff_head ack_pending_q;
struct workqueue_struct *sm_wq;
struct work_struct sm_work;
struct nfc_shdlc_ops *ops;
int client_headroom;
int client_tailroom;
void *clientdata;
};
void nfc_shdlc_recv_frame(struct nfc_shdlc *shdlc, struct sk_buff *skb);
struct nfc_shdlc *nfc_shdlc_allocate(struct nfc_shdlc_ops *ops,
struct nfc_hci_init_data *init_data,
u32 protocols,
int tx_headroom, int tx_tailroom,
int max_link_payload, const char *devname);
void nfc_shdlc_free(struct nfc_shdlc *shdlc);
void nfc_shdlc_set_clientdata(struct nfc_shdlc *shdlc, void *clientdata);
void *nfc_shdlc_get_clientdata(struct nfc_shdlc *shdlc);
struct nfc_hci_dev *nfc_shdlc_get_hci_dev(struct nfc_shdlc *shdlc);
#endif /* __NFC_SHDLC_H */