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Commit eb738fe5 authored by Eric Lapuyade's avatar Eric Lapuyade Committed by John W. Linville
Browse files

NFC: SHDLC implementation 



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: default avatarEric Lapuyade <eric.lapuyade@intel.com>
Signed-off-by: default avatarSamuel Ortiz <sameo@linux.intel.com>
Signed-off-by: default avatarJohn W. Linville <linville@tuxdriver.com>
parent 8b8d2e08

include/net/nfc/shdlc.h

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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 */

net/nfc/hci/Kconfig

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@@ -6,3 +6,11 @@ config NFC_HCI 
	 Say Y here if you want to build support for a kernel NFC HCI

	 Say Y here if you want to build support for a kernel NFC HCI

	 implementation. This is mostly needed for devices that only process

	 implementation. This is mostly needed for devices that only process

	 HCI frames, like for example the NXP pn544.

	 HCI frames, like for example the NXP pn544.



config NFC_SHDLC

	depends on NFC_HCI

	bool "SHDLC link layer for HCI based NFC drivers"

	default n

	---help---

	  Say yes if you use an NFC HCI driver that requires SHDLC link layer.

	  If unsure, say N here.

net/nfc/hci/Makefile

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@@ -5,3 +5,4 @@ 
obj-$(CONFIG_NFC_HCI) += hci.o

obj-$(CONFIG_NFC_HCI) += hci.o





hci-y			:= core.o hcp.o command.o

hci-y			:= core.o hcp.o command.o

hci-$(CONFIG_NFC_SHDLC)	+= shdlc.o

net/nfc/hci/shdlc.c

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