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NFC: basic NCI protocol implementation
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The NFC Controller Interface (NCI) is a standard
communication protocol between an NFC Controller (NFCC)
and a Device Host (DH), defined by the NFC Forum.

Signed-off-by: Ilan Elias <ilane@ti.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
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Ilan Elias authored and linvjw committed Sep 20, 2011
1 parent 55eb94f commit 6a2968a
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313 changes: 313 additions & 0 deletions include/net/nfc/nci.h
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/*
* The NFC Controller Interface is the communication protocol between an
* NFC Controller (NFCC) and a Device Host (DH).
*
* Copyright (C) 2011 Texas Instruments, Inc.
*
* Written by Ilan Elias <ilane@ti.com>
*
* Acknowledgements:
* This file is based on hci.h, which was written
* by Maxim Krasnyansky.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms 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, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*
*/

#ifndef __NCI_H
#define __NCI_H

/* NCI constants */
#define NCI_MAX_NUM_MAPPING_CONFIGS 10
#define NCI_MAX_NUM_RF_CONFIGS 10
#define NCI_MAX_NUM_CONN 10

/* NCI Status Codes */
#define NCI_STATUS_OK 0x00
#define NCI_STATUS_REJECTED 0x01
#define NCI_STATUS_MESSAGE_CORRUPTED 0x02
#define NCI_STATUS_BUFFER_FULL 0x03
#define NCI_STATUS_FAILED 0x04
#define NCI_STATUS_NOT_INITIALIZED 0x05
#define NCI_STATUS_SYNTAX_ERROR 0x06
#define NCI_STATUS_SEMANTIC_ERROR 0x07
#define NCI_STATUS_UNKNOWN_GID 0x08
#define NCI_STATUS_UNKNOWN_OID 0x09
#define NCI_STATUS_INVALID_PARAM 0x0a
#define NCI_STATUS_MESSAGE_SIZE_EXCEEDED 0x0b
/* Discovery Specific Status Codes */
#define NCI_STATUS_DISCOVERY_ALREADY_STARTED 0xa0
#define NCI_STATUS_DISCOVERY_TARGET_ACTIVATION_FAILED 0xa1
/* RF Interface Specific Status Codes */
#define NCI_STATUS_RF_TRANSMISSION_ERROR 0xb0
#define NCI_STATUS_RF_PROTOCOL_ERROR 0xb1
#define NCI_STATUS_RF_TIMEOUT_ERROR 0xb2
#define NCI_STATUS_RF_LINK_LOSS_ERROR 0xb3
/* NFCEE Interface Specific Status Codes */
#define NCI_STATUS_MAX_ACTIVE_NFCEE_INTERFACES_REACHED 0xc0
#define NCI_STATUS_NFCEE_INTERFACE_ACTIVATION_FAILED 0xc1
#define NCI_STATUS_NFCEE_TRANSMISSION_ERROR 0xc2
#define NCI_STATUS_NFCEE_PROTOCOL_ERROR 0xc3
#define NCI_STATUS_NFCEE_TIMEOUT_ERROR 0xc4

/* NCI RF Technology and Mode */
#define NCI_NFC_A_PASSIVE_POLL_MODE 0x00
#define NCI_NFC_B_PASSIVE_POLL_MODE 0x01
#define NCI_NFC_F_PASSIVE_POLL_MODE 0x02
#define NCI_NFC_A_ACTIVE_POLL_MODE 0x03
#define NCI_NFC_F_ACTIVE_POLL_MODE 0x05
#define NCI_NFC_A_PASSIVE_LISTEN_MODE 0x80
#define NCI_NFC_B_PASSIVE_LISTEN_MODE 0x81
#define NCI_NFC_F_PASSIVE_LISTEN_MODE 0x82
#define NCI_NFC_A_ACTIVE_LISTEN_MODE 0x83
#define NCI_NFC_F_ACTIVE_LISTEN_MODE 0x85

/* NCI RF Protocols */
#define NCI_RF_PROTOCOL_UNKNOWN 0x00
#define NCI_RF_PROTOCOL_T1T 0x01
#define NCI_RF_PROTOCOL_T2T 0x02
#define NCI_RF_PROTOCOL_T3T 0x03
#define NCI_RF_PROTOCOL_ISO_DEP 0x04
#define NCI_RF_PROTOCOL_NFC_DEP 0x05

/* NCI RF Interfaces */
#define NCI_RF_INTERFACE_RFU 0x00
#define NCI_RF_INTERFACE_FRAME 0x01
#define NCI_RF_INTERFACE_ISO_DEP 0x02
#define NCI_RF_INTERFACE_NFC_DEP 0x03

/* NCI RF_DISCOVER_MAP_CMD modes */
#define NCI_DISC_MAP_MODE_POLL 0x01
#define NCI_DISC_MAP_MODE_LISTEN 0x02
#define NCI_DISC_MAP_MODE_BOTH 0x03

/* NCI Discovery Types */
#define NCI_DISCOVERY_TYPE_POLL_A_PASSIVE 0x00
#define NCI_DISCOVERY_TYPE_POLL_B_PASSIVE 0x01
#define NCI_DISCOVERY_TYPE_POLL_F_PASSIVE 0x02
#define NCI_DISCOVERY_TYPE_POLL_A_ACTIVE 0x03
#define NCI_DISCOVERY_TYPE_POLL_F_ACTIVE 0x05
#define NCI_DISCOVERY_TYPE_WAKEUP_A_PASSIVE 0x06
#define NCI_DISCOVERY_TYPE_WAKEUP_B_PASSIVE 0x07
#define NCI_DISCOVERY_TYPE_WAKEUP_A_ACTIVE 0x09
#define NCI_DISCOVERY_TYPE_LISTEN_A_PASSIVE 0x80
#define NCI_DISCOVERY_TYPE_LISTEN_B_PASSIVE 0x81
#define NCI_DISCOVERY_TYPE_LISTEN_F_PASSIVE 0x82
#define NCI_DISCOVERY_TYPE_LISTEN_A_ACTIVE 0x83
#define NCI_DISCOVERY_TYPE_LISTEN_F_ACTIVE 0x85

/* NCI Deactivation Type */
#define NCI_DEACTIVATE_TYPE_IDLE_MODE 0x00
#define NCI_DEACTIVATE_TYPE_SLEEP_MODE 0x01
#define NCI_DEACTIVATE_TYPE_SLEEP_AF_MODE 0x02
#define NCI_DEACTIVATE_TYPE_RF_LINK_LOSS 0x03
#define NCI_DEACTIVATE_TYPE_DISCOVERY_ERROR 0x04

/* Message Type (MT) */
#define NCI_MT_DATA_PKT 0x00
#define NCI_MT_CMD_PKT 0x01
#define NCI_MT_RSP_PKT 0x02
#define NCI_MT_NTF_PKT 0x03

#define nci_mt(hdr) (((hdr)[0]>>5)&0x07)
#define nci_mt_set(hdr, mt) ((hdr)[0] |= (__u8)(((mt)&0x07)<<5))

/* Packet Boundary Flag (PBF) */
#define NCI_PBF_LAST 0x00
#define NCI_PBF_CONT 0x01

#define nci_pbf(hdr) (__u8)(((hdr)[0]>>4)&0x01)
#define nci_pbf_set(hdr, pbf) ((hdr)[0] |= (__u8)(((pbf)&0x01)<<4))

/* Control Opcode manipulation */
#define nci_opcode_pack(gid, oid) (__u16)((((__u16)((gid)&0x0f))<<8)|\
((__u16)((oid)&0x3f)))
#define nci_opcode(hdr) nci_opcode_pack(hdr[0], hdr[1])
#define nci_opcode_gid(op) (__u8)(((op)&0x0f00)>>8)
#define nci_opcode_oid(op) (__u8)((op)&0x003f)

/* Payload Length */
#define nci_plen(hdr) (__u8)((hdr)[2])

/* Connection ID */
#define nci_conn_id(hdr) (__u8)(((hdr)[0])&0x0f)

/* GID values */
#define NCI_GID_CORE 0x0
#define NCI_GID_RF_MGMT 0x1
#define NCI_GID_NFCEE_MGMT 0x2
#define NCI_GID_PROPRIETARY 0xf

/* ---- NCI Packet structures ---- */
#define NCI_CTRL_HDR_SIZE 3
#define NCI_DATA_HDR_SIZE 3

struct nci_ctrl_hdr {
__u8 gid; /* MT & PBF & GID */
__u8 oid;
__u8 plen;
} __packed;

struct nci_data_hdr {
__u8 conn_id; /* MT & PBF & ConnID */
__u8 rfu;
__u8 plen;
} __packed;

/* ------------------------ */
/* ----- NCI Commands ---- */
/* ------------------------ */
#define NCI_OP_CORE_RESET_CMD nci_opcode_pack(NCI_GID_CORE, 0x00)

#define NCI_OP_CORE_INIT_CMD nci_opcode_pack(NCI_GID_CORE, 0x01)

#define NCI_OP_CORE_SET_CONFIG_CMD nci_opcode_pack(NCI_GID_CORE, 0x02)

#define NCI_OP_CORE_CONN_CREATE_CMD nci_opcode_pack(NCI_GID_CORE, 0x04)
struct nci_core_conn_create_cmd {
__u8 target_handle;
__u8 num_target_specific_params;
} __packed;

#define NCI_OP_CORE_CONN_CLOSE_CMD nci_opcode_pack(NCI_GID_CORE, 0x06)

#define NCI_OP_RF_DISCOVER_MAP_CMD nci_opcode_pack(NCI_GID_RF_MGMT, 0x00)
struct disc_map_config {
__u8 rf_protocol;
__u8 mode;
__u8 rf_interface_type;
} __packed;

struct nci_rf_disc_map_cmd {
__u8 num_mapping_configs;
struct disc_map_config mapping_configs
[NCI_MAX_NUM_MAPPING_CONFIGS];
} __packed;

#define NCI_OP_RF_DISCOVER_CMD nci_opcode_pack(NCI_GID_RF_MGMT, 0x03)
struct disc_config {
__u8 type;
__u8 frequency;
} __packed;

struct nci_rf_disc_cmd {
__u8 num_disc_configs;
struct disc_config disc_configs[NCI_MAX_NUM_RF_CONFIGS];
} __packed;

#define NCI_OP_RF_DEACTIVATE_CMD nci_opcode_pack(NCI_GID_RF_MGMT, 0x06)
struct nci_rf_deactivate_cmd {
__u8 type;
} __packed;

/* ----------------------- */
/* ---- NCI Responses ---- */
/* ----------------------- */
#define NCI_OP_CORE_RESET_RSP nci_opcode_pack(NCI_GID_CORE, 0x00)
struct nci_core_reset_rsp {
__u8 status;
__u8 nci_ver;
} __packed;

#define NCI_OP_CORE_INIT_RSP nci_opcode_pack(NCI_GID_CORE, 0x01)
struct nci_core_init_rsp_1 {
__u8 status;
__le32 nfcc_features;
__u8 num_supported_rf_interfaces;
__u8 supported_rf_interfaces[0]; /* variable size array */
/* continuted in nci_core_init_rsp_2 */
} __packed;

struct nci_core_init_rsp_2 {
__u8 max_logical_connections;
__le16 max_routing_table_size;
__u8 max_control_packet_payload_length;
__le16 rf_sending_buffer_size;
__le16 rf_receiving_buffer_size;
__le16 manufacturer_id;
} __packed;

#define NCI_OP_CORE_SET_CONFIG_RSP nci_opcode_pack(NCI_GID_CORE, 0x02)

#define NCI_OP_CORE_CONN_CREATE_RSP nci_opcode_pack(NCI_GID_CORE, 0x04)
struct nci_core_conn_create_rsp {
__u8 status;
__u8 max_pkt_payload_size;
__u8 initial_num_credits;
__u8 conn_id;
} __packed;

#define NCI_OP_CORE_CONN_CLOSE_RSP nci_opcode_pack(NCI_GID_CORE, 0x06)

#define NCI_OP_RF_DISCOVER_MAP_RSP nci_opcode_pack(NCI_GID_RF_MGMT, 0x00)

#define NCI_OP_RF_DISCOVER_RSP nci_opcode_pack(NCI_GID_RF_MGMT, 0x03)

#define NCI_OP_RF_DEACTIVATE_RSP nci_opcode_pack(NCI_GID_RF_MGMT, 0x06)

/* --------------------------- */
/* ---- NCI Notifications ---- */
/* --------------------------- */
#define NCI_OP_CORE_CONN_CREDITS_NTF nci_opcode_pack(NCI_GID_CORE, 0x07)
struct conn_credit_entry {
__u8 conn_id;
__u8 credits;
} __packed;

struct nci_core_conn_credit_ntf {
__u8 num_entries;
struct conn_credit_entry conn_entries[NCI_MAX_NUM_CONN];
} __packed;

#define NCI_OP_RF_FIELD_INFO_NTF nci_opcode_pack(NCI_GID_CORE, 0x08)
struct nci_rf_field_info_ntf {
__u8 rf_field_status;
} __packed;

#define NCI_OP_RF_ACTIVATE_NTF nci_opcode_pack(NCI_GID_RF_MGMT, 0x05)
struct rf_tech_specific_params_nfca_poll {
__u16 sens_res;
__u8 nfcid1_len; /* 0, 4, 7, or 10 Bytes */
__u8 nfcid1[10];
__u8 sel_res_len; /* 0 or 1 Bytes */
__u8 sel_res;
} __packed;

struct activation_params_nfca_poll_iso_dep {
__u8 rats_res_len;
__u8 rats_res[20];
};

struct nci_rf_activate_ntf {
__u8 target_handle;
__u8 rf_protocol;
__u8 rf_tech_and_mode;
__u8 rf_tech_specific_params_len;

union {
struct rf_tech_specific_params_nfca_poll nfca_poll;
} rf_tech_specific_params;

__u8 rf_interface_type;
__u8 activation_params_len;

union {
struct activation_params_nfca_poll_iso_dep nfca_poll_iso_dep;
} activation_params;

} __packed;

#define NCI_OP_RF_DEACTIVATE_NTF nci_opcode_pack(NCI_GID_RF_MGMT, 0x06)

#endif /* __NCI_H */
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