linux-imx

/*

 * Low Level Transport (NDLC) Driver for STMicroelectronics NFC Chip

 *

 * Copyright (C) 2014-2015  STMicroelectronics SAS. All rights reserved.

 *

 * This program is free software; you can redistribute it and/or modify it

 * under the terms and conditions of the GNU General Public License,

 * version 2, as published by the Free Software Foundation.

 *

 * 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, see <http://www.gnu.org/licenses/>.

 */

​

#include <linux/sched.h>

#include <net/nfc/nci_core.h>

​

#include "st-nci.h"

​

#define NDLC_TIMER_T1       100

#define NDLC_TIMER_T1_WAIT  400

#define NDLC_TIMER_T2       1200

​

#define PCB_TYPE_DATAFRAME      0x80

#define PCB_TYPE_SUPERVISOR     0xc0

#define PCB_TYPE_MASK           PCB_TYPE_SUPERVISOR

​

#define PCB_SYNC_ACK            0x20

#define PCB_SYNC_NACK           0x10

#define PCB_SYNC_WAIT           0x30

#define PCB_SYNC_NOINFO         0x00

#define PCB_SYNC_MASK           PCB_SYNC_WAIT

​

#define PCB_DATAFRAME_RETRANSMIT_YES    0x00

#define PCB_DATAFRAME_RETRANSMIT_NO 0x04

#define PCB_DATAFRAME_RETRANSMIT_MASK   PCB_DATAFRAME_RETRANSMIT_NO

​

#define PCB_SUPERVISOR_RETRANSMIT_YES   0x00

#define PCB_SUPERVISOR_RETRANSMIT_NO    0x02

#define PCB_SUPERVISOR_RETRANSMIT_MASK  PCB_SUPERVISOR_RETRANSMIT_NO

​

#define PCB_FRAME_CRC_INFO_PRESENT  0x08

#define PCB_FRAME_CRC_INFO_NOTPRESENT   0x00

#define PCB_FRAME_CRC_INFO_MASK     PCB_FRAME_CRC_INFO_PRESENT

​

#define NDLC_DUMP_SKB(info, skb)                                 \

do {                                                             \

    pr_debug("%s:\n", info);                                 \

    print_hex_dump(KERN_DEBUG, "ndlc: ", DUMP_PREFIX_OFFSET, \

            16, 1, skb->data, skb->len, 0);          \

} while (0)

​

int ndlc_open(struct llt_ndlc *ndlc)

{

    /* toggle reset pin */

    ndlc->ops->enable(ndlc->phy_id);

    ndlc->powered = 1;

    return 0;

}