8c0695e499
This adds polling support for NFC-F technology at 212 kbits/s and 424
kbits/s. A user space application like neard can send type 3 tag
commands through the NFC core.
Process flow for NFC-F detection is as follow:
1 - The digital stack sends the SENSF_REQ command to the NFC device.
2 - A peer device replies with a SENSF_RES response.
3 - The digital stack notifies the NFC core of the presence of a
target in the operation field and passes the target NFCID2.
This also adds support for CRC calculation of type CRC-F. The CRC
calculation is handled by the digital stack if the NFC device doesn't
support it.
Signed-off-by: Thierry Escande <thierry.escande@linux.intel.com>
Signed-off-by: Samuel Ortiz <sameo@linux.intel.com>
128 lines
3.7 KiB
C
128 lines
3.7 KiB
C
/*
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* NFC Digital Protocol stack
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* Copyright (c) 2013, Intel Corporation.
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms and conditions of the GNU General Public License,
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* version 2, as published by the Free Software Foundation.
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*
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* This program is distributed in the hope it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
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* more details.
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*
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*/
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#ifndef __DIGITAL_H
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#define __DIGITAL_H
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#include <net/nfc/nfc.h>
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#include <net/nfc/digital.h>
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#include <linux/crc-ccitt.h>
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#include <linux/crc-itu-t.h>
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#define PR_DBG(fmt, ...) pr_debug("%s: " fmt "\n", __func__, ##__VA_ARGS__)
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#define PR_ERR(fmt, ...) pr_err("%s: " fmt "\n", __func__, ##__VA_ARGS__)
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#define PROTOCOL_ERR(req) pr_err("%s:%d: NFC Digital Protocol error: %s\n", \
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__func__, __LINE__, req)
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#define DIGITAL_CMD_IN_SEND 0
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#define DIGITAL_CMD_TG_SEND 1
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#define DIGITAL_CMD_TG_LISTEN 2
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#define DIGITAL_CMD_TG_LISTEN_MDAA 3
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#define DIGITAL_MAX_HEADER_LEN 7
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#define DIGITAL_CRC_LEN 2
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#define DIGITAL_DRV_CAPS_IN_CRC(ddev) \
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((ddev)->driver_capabilities & NFC_DIGITAL_DRV_CAPS_IN_CRC)
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#define DIGITAL_DRV_CAPS_TG_CRC(ddev) \
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((ddev)->driver_capabilities & NFC_DIGITAL_DRV_CAPS_TG_CRC)
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struct digital_data_exch {
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data_exchange_cb_t cb;
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void *cb_context;
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};
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struct sk_buff *digital_skb_alloc(struct nfc_digital_dev *ddev,
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unsigned int len);
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int digital_send_cmd(struct nfc_digital_dev *ddev, u8 cmd_type,
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struct sk_buff *skb, u16 timeout,
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nfc_digital_cmd_complete_t cmd_cb, void *cb_context);
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int digital_in_configure_hw(struct nfc_digital_dev *ddev, int type, int param);
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static inline int digital_in_send_cmd(struct nfc_digital_dev *ddev,
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struct sk_buff *skb, u16 timeout,
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nfc_digital_cmd_complete_t cmd_cb,
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void *cb_context)
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{
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return digital_send_cmd(ddev, DIGITAL_CMD_IN_SEND, skb, timeout, cmd_cb,
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cb_context);
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}
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void digital_poll_next_tech(struct nfc_digital_dev *ddev);
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int digital_in_send_sens_req(struct nfc_digital_dev *ddev, u8 rf_tech);
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int digital_in_send_sensf_req(struct nfc_digital_dev *ddev, u8 rf_tech);
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int digital_target_found(struct nfc_digital_dev *ddev,
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struct nfc_target *target, u8 protocol);
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int digital_in_recv_mifare_res(struct sk_buff *resp);
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typedef u16 (*crc_func_t)(u16, const u8 *, size_t);
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#define CRC_A_INIT 0x6363
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#define CRC_B_INIT 0xFFFF
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#define CRC_F_INIT 0x0000
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void digital_skb_add_crc(struct sk_buff *skb, crc_func_t crc_func, u16 init,
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u8 bitwise_inv, u8 msb_first);
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static inline void digital_skb_add_crc_a(struct sk_buff *skb)
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{
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digital_skb_add_crc(skb, crc_ccitt, CRC_A_INIT, 0, 0);
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}
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static inline void digital_skb_add_crc_b(struct sk_buff *skb)
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{
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digital_skb_add_crc(skb, crc_ccitt, CRC_B_INIT, 1, 0);
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}
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static inline void digital_skb_add_crc_f(struct sk_buff *skb)
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{
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digital_skb_add_crc(skb, crc_itu_t, CRC_F_INIT, 0, 1);
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}
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static inline void digital_skb_add_crc_none(struct sk_buff *skb)
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{
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return;
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}
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int digital_skb_check_crc(struct sk_buff *skb, crc_func_t crc_func,
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u16 crc_init, u8 bitwise_inv, u8 msb_first);
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static inline int digital_skb_check_crc_a(struct sk_buff *skb)
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{
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return digital_skb_check_crc(skb, crc_ccitt, CRC_A_INIT, 0, 0);
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}
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static inline int digital_skb_check_crc_b(struct sk_buff *skb)
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{
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return digital_skb_check_crc(skb, crc_ccitt, CRC_B_INIT, 1, 0);
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}
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static inline int digital_skb_check_crc_f(struct sk_buff *skb)
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{
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return digital_skb_check_crc(skb, crc_itu_t, CRC_F_INIT, 0, 1);
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}
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static inline int digital_skb_check_crc_none(struct sk_buff *skb)
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{
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return 0;
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}
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#endif /* __DIGITAL_H */
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