7d0911c02f
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>
142 lines
4.2 KiB
C
142 lines
4.2 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_SENSF_NFCID2_NFC_DEP_B1 0x01
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#define DIGITAL_SENSF_NFCID2_NFC_DEP_B2 0xFE
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#define DIGITAL_SENS_RES_NFC_DEP 0x0100
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#define DIGITAL_SEL_RES_NFC_DEP 0x40
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#define DIGITAL_SENSF_FELICA_SC 0xFFFF
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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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int digital_in_send_atr_req(struct nfc_digital_dev *ddev,
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struct nfc_target *target, __u8 comm_mode, __u8 *gb,
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size_t gb_len);
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int digital_in_send_dep_req(struct nfc_digital_dev *ddev,
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struct nfc_target *target, struct sk_buff *skb,
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struct digital_data_exch *data_exch);
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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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