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7d0911c02f
linux/net/nfc/digital.h
Thierry Escande 7d0911c02f NFC Digital: Add initiator NFC-DEP support 
This adds support for NFC-DEP protocol in initiator mode for NFC-A and
NFC-F technologies.

When a target is detected, the process flow is as follow:

For NFC-A technology:
1 - The digital stack receives a SEL_RES as the reply of the SEL_REQ
    command.
2   - If b7 of SEL_RES is set, the peer device is configure for NFC-DEP
      protocol. NFC core is notified through nfc_targets_found().
      Execution continues at step 4.
3   - Otherwise, it's a tag and the NFC core is notified. Detection
      ends.
4 - The digital stacks sends an ATR_REQ command containing a randomly
    generated NFCID3 and the general bytes obtained from the LLCP layer
    of NFC core.

For NFC-F technology:
1 - The digital stack receives a SENSF_RES as the reply of the
    SENSF_REQ command.
2   - If B1 and B2 of NFCID2 are 0x01 and 0xFE respectively, the peer
      device is configured for NFC-DEP protocol. NFC core is notified
      through nfc_targets_found(). Execution continues at step 4.
3   - Otherwise it's a type 3 tag. NFC core is notified. Detection
      ends.
4 - The digital stacks sends an ATR_REQ command containing the NFC-F
    NFCID2 as NFCID3 and the general bytes obtained from the LLCP layer
    of NFC core.

For both technologies:
5 - The digital stacks receives the ATR_RES response containing the
    NFCID3 and the general bytes of the peer device.
6 - The digital stack notifies NFC core that the DEP link is up through
    nfc_dep_link_up().
7 - The NFC core performs data exchange through tm_transceive().
8 - The digital stack sends a DEP_REQ command containing an I PDU with
    the data from NFC core.
9 - The digital stack receives a DEP_RES command
10  - If the DEP_RES response contains a supervisor PDU with timeout
      extension request (RTOX) the digital stack sends a DEP_REQ
      command containing a supervisor PDU acknowledging the RTOX
      request. The execution continues at step 9.
11  - If the DEP_RES response contains an I PDU, the response data is
      passed back to NFC core through the response callback. The
      execution continues at step 8.

Signed-off-by: Thierry Escande <thierry.escande@linux.intel.com>
Signed-off-by: Samuel Ortiz <sameo@linux.intel.com>
2013-09-25 02:02:27 +02:00

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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 PR_DBG(fmt, ...) pr_debug("%s: " fmt "\n", __func__, ##__VA_ARGS__)
#define PR_ERR(fmt, ...) pr_err("%s: " fmt "\n", __func__, ##__VA_ARGS__)
#define PROTOCOL_ERR(req) pr_err("%s:%d: NFC Digital Protocol error: %s\n", \
__func__, __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, 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, 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_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);
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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