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linux-next/net/nfc/digital.h
Thierry Escande c813007f9f NFC: digital: Add ISO-DEP support for data exchange 
When a type 4A target is activated, this change adds the ISO-DEP SoD
when sending frames and removes it when receiving responses. Chaining
is not supported so sent frames are rejected if they exceed remote FSC
bytes.

Signed-off-by: Thierry Escande <thierry.escande@linux.intel.com>
Signed-off-by: Samuel Ortiz <sameo@linux.intel.com>
2014-02-16 23:49:54 +01:00

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/*
* NFC Digital Protocol stack
* Copyright (c) 2013, Intel Corporation.
*
* 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 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.
*
*/
#ifndef __DIGITAL_H
#define __DIGITAL_H
#include <net/nfc/nfc.h>
#include <net/nfc/digital.h>
#include <linux/crc-ccitt.h>
#include <linux/crc-itu-t.h>
#define PROTOCOL_ERR(req) pr_err("%d: NFC Digital Protocol error: %s\n", \
__LINE__, req)
#define DIGITAL_CMD_IN_SEND 0
#define DIGITAL_CMD_TG_SEND 1
#define DIGITAL_CMD_TG_LISTEN 2
#define DIGITAL_CMD_TG_LISTEN_MDAA 3
#define DIGITAL_MAX_HEADER_LEN 7
#define DIGITAL_CRC_LEN 2
#define DIGITAL_SENSF_NFCID2_NFC_DEP_B1 0x01
#define DIGITAL_SENSF_NFCID2_NFC_DEP_B2 0xFE
#define DIGITAL_SENS_RES_NFC_DEP 0x0100
#define DIGITAL_SEL_RES_NFC_DEP 0x40
#define DIGITAL_SENSF_FELICA_SC 0xFFFF
#define DIGITAL_DRV_CAPS_IN_CRC(ddev) \
((ddev)->driver_capabilities & NFC_DIGITAL_DRV_CAPS_IN_CRC)
#define DIGITAL_DRV_CAPS_TG_CRC(ddev) \
((ddev)->driver_capabilities & NFC_DIGITAL_DRV_CAPS_TG_CRC)
struct digital_data_exch {
data_exchange_cb_t cb;
void *cb_context;
};
struct sk_buff *digital_skb_alloc(struct nfc_digital_dev *ddev,
unsigned int len);
int digital_send_cmd(struct nfc_digital_dev *ddev, u8 cmd_type,
struct sk_buff *skb, struct digital_tg_mdaa_params *params,
u16 timeout, nfc_digital_cmd_complete_t cmd_cb,
void *cb_context);
int digital_in_configure_hw(struct nfc_digital_dev *ddev, int type, int param);
static inline int digital_in_send_cmd(struct nfc_digital_dev *ddev,
struct sk_buff *skb, u16 timeout,
nfc_digital_cmd_complete_t cmd_cb,
void *cb_context)
{
return digital_send_cmd(ddev, DIGITAL_CMD_IN_SEND, skb, NULL, timeout,
cmd_cb, cb_context);
}
void digital_poll_next_tech(struct nfc_digital_dev *ddev);
int digital_in_send_sens_req(struct nfc_digital_dev *ddev, u8 rf_tech);
int digital_in_send_sensf_req(struct nfc_digital_dev *ddev, u8 rf_tech);
int digital_in_send_iso15693_inv_req(struct nfc_digital_dev *ddev, u8 rf_tech);
int digital_in_iso_dep_pull_sod(struct nfc_digital_dev *ddev,
struct sk_buff *skb);
int digital_in_iso_dep_push_sod(struct nfc_digital_dev *ddev,
struct sk_buff *skb);
int digital_target_found(struct nfc_digital_dev *ddev,
struct nfc_target *target, u8 protocol);
int digital_in_recv_mifare_res(struct sk_buff *resp);
int digital_in_send_atr_req(struct nfc_digital_dev *ddev,
struct nfc_target *target, __u8 comm_mode, __u8 *gb,
size_t gb_len);
int digital_in_send_dep_req(struct nfc_digital_dev *ddev,
struct nfc_target *target, struct sk_buff *skb,
struct digital_data_exch *data_exch);
int digital_tg_configure_hw(struct nfc_digital_dev *ddev, int type, int param);
static inline int digital_tg_send_cmd(struct nfc_digital_dev *ddev,
struct sk_buff *skb, u16 timeout,
nfc_digital_cmd_complete_t cmd_cb, void *cb_context)
{
return digital_send_cmd(ddev, DIGITAL_CMD_TG_SEND, skb, NULL, timeout,
cmd_cb, cb_context);
}
void digital_tg_recv_sens_req(struct nfc_digital_dev *ddev, void *arg,
struct sk_buff *resp);
void digital_tg_recv_sensf_req(struct nfc_digital_dev *ddev, void *arg,
struct sk_buff *resp);
static inline int digital_tg_listen(struct nfc_digital_dev *ddev, u16 timeout,
nfc_digital_cmd_complete_t cb, void *arg)
{
return digital_send_cmd(ddev, DIGITAL_CMD_TG_LISTEN, NULL, NULL,
timeout, cb, arg);
}
void digital_tg_recv_atr_req(struct nfc_digital_dev *ddev, void *arg,
struct sk_buff *resp);
int digital_tg_send_dep_res(struct nfc_digital_dev *ddev, struct sk_buff *skb);
int digital_tg_listen_nfca(struct nfc_digital_dev *ddev, u8 rf_tech);
int digital_tg_listen_nfcf(struct nfc_digital_dev *ddev, u8 rf_tech);
typedef u16 (*crc_func_t)(u16, const u8 *, size_t);
#define CRC_A_INIT 0x6363
#define CRC_B_INIT 0xFFFF
#define CRC_F_INIT 0x0000
void digital_skb_add_crc(struct sk_buff *skb, crc_func_t crc_func, u16 init,
u8 bitwise_inv, u8 msb_first);
static inline void digital_skb_add_crc_a(struct sk_buff *skb)
{
digital_skb_add_crc(skb, crc_ccitt, CRC_A_INIT, 0, 0);
}
static inline void digital_skb_add_crc_b(struct sk_buff *skb)
{
digital_skb_add_crc(skb, crc_ccitt, CRC_B_INIT, 1, 0);
}
static inline void digital_skb_add_crc_f(struct sk_buff *skb)
{
digital_skb_add_crc(skb, crc_itu_t, CRC_F_INIT, 0, 1);
}
static inline void digital_skb_add_crc_none(struct sk_buff *skb)
{
return;
}
int digital_skb_check_crc(struct sk_buff *skb, crc_func_t crc_func,
u16 crc_init, u8 bitwise_inv, u8 msb_first);
static inline int digital_skb_check_crc_a(struct sk_buff *skb)
{
return digital_skb_check_crc(skb, crc_ccitt, CRC_A_INIT, 0, 0);
}
static inline int digital_skb_check_crc_b(struct sk_buff *skb)
{
return digital_skb_check_crc(skb, crc_ccitt, CRC_B_INIT, 1, 0);
}
static inline int digital_skb_check_crc_f(struct sk_buff *skb)
{
return digital_skb_check_crc(skb, crc_itu_t, CRC_F_INIT, 0, 1);
}
static inline int digital_skb_check_crc_none(struct sk_buff *skb)
{
return 0;
}
#endif /* __DIGITAL_H */
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