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NFC: basic NCI protocol implementation 

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>
This commit is contained in:
Ilan Elias 2011-09-18 11:19:35 +03:00 committed by John W. Linville
parent 55eb94f9e9
commit 6a2968aaf5
11 changed files with 2129 additions and 0 deletions
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313
include/net/nfc/nci.h Normal file
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@ -0,0 +1,313 @@
/*
* 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 */

183
include/net/nfc/nci_core.h Normal file
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@ -0,0 +1,183 @@
/*
* 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_core.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_CORE_H
#define __NCI_CORE_H
#include <linux/interrupt.h>
#include <linux/skbuff.h>
#include <net/nfc/nfc.h>
#include <net/nfc/nci.h>
/* NCI device state */
enum {
NCI_INIT,
NCI_UP,
NCI_DISCOVERY,
NCI_POLL_ACTIVE,
};
/* NCI timeouts */
#define NCI_RESET_TIMEOUT 5000
#define NCI_INIT_TIMEOUT 5000
#define NCI_RF_DISC_TIMEOUT 5000
#define NCI_RF_DEACTIVATE_TIMEOUT 5000
#define NCI_CMD_TIMEOUT 5000
struct nci_dev;
struct nci_ops {
int (*open)(struct nci_dev *ndev);
int (*close)(struct nci_dev *ndev);
int (*send)(struct sk_buff *skb);
};
#define NCI_MAX_SUPPORTED_RF_INTERFACES 4
/* NCI Core structures */
struct nci_dev {
struct nfc_dev *nfc_dev;
struct nci_ops *ops;
int tx_headroom;
int tx_tailroom;
unsigned long flags;
atomic_t cmd_cnt;
atomic_t credits_cnt;
struct timer_list cmd_timer;
struct workqueue_struct *cmd_wq;
struct work_struct cmd_work;
struct workqueue_struct *rx_wq;
struct work_struct rx_work;
struct workqueue_struct *tx_wq;
struct work_struct tx_work;
struct sk_buff_head cmd_q;
struct sk_buff_head rx_q;
struct sk_buff_head tx_q;
struct mutex req_lock;
struct completion req_completion;
__u32 req_status;
__u32 req_result;
void *driver_data;
__u32 poll_prots;
__u32 target_available_prots;
__u32 target_active_prot;
/* received during NCI_OP_CORE_RESET_RSP */
__u8 nci_ver;
/* received during NCI_OP_CORE_INIT_RSP */
__u32 nfcc_features;
__u8 num_supported_rf_interfaces;
__u8 supported_rf_interfaces
[NCI_MAX_SUPPORTED_RF_INTERFACES];
__u8 max_logical_connections;
__u16 max_routing_table_size;
__u8 max_control_packet_payload_length;
__u16 rf_sending_buffer_size;
__u16 rf_receiving_buffer_size;
__u16 manufacturer_id;
/* received during NCI_OP_CORE_CONN_CREATE_RSP for static conn 0 */
__u8 max_pkt_payload_size;
__u8 initial_num_credits;
__u8 conn_id;
/* stored during nci_data_exchange */
data_exchange_cb_t data_exchange_cb;
void *data_exchange_cb_context;
struct sk_buff *rx_data_reassembly;
};
/* ----- NCI Devices ----- */
struct nci_dev *nci_allocate_device(struct nci_ops *ops,
__u32 supported_protocols,
int tx_headroom,
int tx_tailroom);
void nci_free_device(struct nci_dev *ndev);
int nci_register_device(struct nci_dev *ndev);
void nci_unregister_device(struct nci_dev *ndev);
int nci_recv_frame(struct sk_buff *skb);
static inline struct sk_buff *nci_skb_alloc(struct nci_dev *ndev,
unsigned int len,
gfp_t how)
{
struct sk_buff *skb;
skb = alloc_skb(len + ndev->tx_headroom + ndev->tx_tailroom, how);
if (skb)
skb_reserve(skb, ndev->tx_headroom);
return skb;
}
static inline void nci_set_parent_dev(struct nci_dev *ndev, struct device *dev)
{
nfc_set_parent_dev(ndev->nfc_dev, dev);
}
static inline void nci_set_drvdata(struct nci_dev *ndev, void *data)
{
ndev->driver_data = data;
}
static inline void *nci_get_drvdata(struct nci_dev *ndev)
{
return ndev->driver_data;
}
void nci_rsp_packet(struct nci_dev *ndev, struct sk_buff *skb);
void nci_ntf_packet(struct nci_dev *ndev, struct sk_buff *skb);
void nci_rx_data_packet(struct nci_dev *ndev, struct sk_buff *skb);
int nci_send_cmd(struct nci_dev *ndev, __u16 opcode, __u8 plen, void *payload);
int nci_send_data(struct nci_dev *ndev, __u8 conn_id, struct sk_buff *skb);
void nci_data_exchange_complete(struct nci_dev *ndev, struct sk_buff *skb,
int err);
/* ----- NCI requests ----- */
#define NCI_REQ_DONE 0
#define NCI_REQ_PEND 1
#define NCI_REQ_CANCELED 2
void nci_req_complete(struct nci_dev *ndev, int result);
/* ----- NCI status code ----- */
int nci_to_errno(__u8 code);
#endif /* __NCI_CORE_H */

2
net/nfc/Kconfig
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@ -13,4 +13,6 @@ menuconfig NFC
To compile this support as a module, choose M here: the module will
be called nfc.
source "net/nfc/nci/Kconfig"
source "drivers/nfc/Kconfig"

1
net/nfc/Makefile
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@ -3,5 +3,6 @@
#
obj-$(CONFIG_NFC) += nfc.o
obj-$(CONFIG_NFC_NCI) += nci/
nfc-objs := core.o netlink.o af_nfc.o rawsock.o

10
net/nfc/nci/Kconfig Normal file
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@ -0,0 +1,10 @@
config NFC_NCI
depends on NFC && EXPERIMENTAL
tristate "NCI protocol support (EXPERIMENTAL)"
default n
help
NCI (NFC Controller Interface) is a communication protocol between
an NFC Controller (NFCC) and a Device Host (DH).
Say Y here to compile NCI support into the kernel or say M to
compile it as module (nci).

7
net/nfc/nci/Makefile Normal file
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@ -0,0 +1,7 @@
#
# Makefile for the Linux NFC NCI layer.
#
obj-$(CONFIG_NFC_NCI) += nci.o
nci-objs := core.o data.o lib.o ntf.o rsp.o

790
net/nfc/nci/core.c Normal file
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@ -0,0 +1,790 @@
/*
* 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_core.c, 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
*
*/
#include <linux/types.h>
#include <linux/workqueue.h>
#include <linux/completion.h>
#include <linux/sched.h>
#include <linux/bitops.h>
#include <linux/skbuff.h>
#include "../nfc.h"
#include <net/nfc/nci.h>
#include <net/nfc/nci_core.h>
#include <linux/nfc.h>
static void nci_cmd_work(struct work_struct *work);
static void nci_rx_work(struct work_struct *work);
static void nci_tx_work(struct work_struct *work);
/* ---- NCI requests ---- */
void nci_req_complete(struct nci_dev *ndev, int result)
{
if (ndev->req_status == NCI_REQ_PEND) {
ndev->req_result = result;
ndev->req_status = NCI_REQ_DONE;
complete(&ndev->req_completion);
}
}
static void nci_req_cancel(struct nci_dev *ndev, int err)
{
if (ndev->req_status == NCI_REQ_PEND) {
ndev->req_result = err;
ndev->req_status = NCI_REQ_CANCELED;
complete(&ndev->req_completion);
}
}
/* Execute request and wait for completion. */
static int __nci_request(struct nci_dev *ndev,
void (*req)(struct nci_dev *ndev, unsigned long opt),
unsigned long opt,
__u32 timeout)
{
int rc = 0;
unsigned long completion_rc;
ndev->req_status = NCI_REQ_PEND;
init_completion(&ndev->req_completion);
req(ndev, opt);
completion_rc = wait_for_completion_interruptible_timeout(
&ndev->req_completion,
timeout);
nfc_dbg("wait_for_completion return %ld", completion_rc);
if (completion_rc > 0) {
switch (ndev->req_status) {
case NCI_REQ_DONE:
rc = nci_to_errno(ndev->req_result);
break;
case NCI_REQ_CANCELED:
rc = -ndev->req_result;
break;
default:
rc = -ETIMEDOUT;
break;
}
} else {
nfc_err("wait_for_completion_interruptible_timeout failed %ld",
completion_rc);
rc = ((completion_rc == 0) ? (-ETIMEDOUT) : (completion_rc));
}
ndev->req_status = ndev->req_result = 0;
return rc;
}
static inline int nci_request(struct nci_dev *ndev,
void (*req)(struct nci_dev *ndev, unsigned long opt),
unsigned long opt, __u32 timeout)
{
int rc;
if (!test_bit(NCI_UP, &ndev->flags))
return -ENETDOWN;
/* Serialize all requests */
mutex_lock(&ndev->req_lock);
rc = __nci_request(ndev, req, opt, timeout);
mutex_unlock(&ndev->req_lock);
return rc;
}
static void nci_reset_req(struct nci_dev *ndev, unsigned long opt)
{
nci_send_cmd(ndev, NCI_OP_CORE_RESET_CMD, 0, NULL);
}
static void nci_init_req(struct nci_dev *ndev, unsigned long opt)
{
nci_send_cmd(ndev, NCI_OP_CORE_INIT_CMD, 0, NULL);
}
static void nci_init_complete_req(struct nci_dev *ndev, unsigned long opt)
{
struct nci_rf_disc_map_cmd cmd;
struct nci_core_conn_create_cmd conn_cmd;
int i;
/* create static rf connection */
conn_cmd.target_handle = 0;
conn_cmd.num_target_specific_params = 0;
nci_send_cmd(ndev, NCI_OP_CORE_CONN_CREATE_CMD, 2, &conn_cmd);
/* set rf mapping configurations */
cmd.num_mapping_configs = 0;
/* by default mapping is set to NCI_RF_INTERFACE_FRAME */
for (i = 0; i < ndev->num_supported_rf_interfaces; i++) {
if (ndev->supported_rf_interfaces[i] ==
NCI_RF_INTERFACE_ISO_DEP) {
cmd.mapping_configs[cmd.num_mapping_configs]
.rf_protocol = NCI_RF_PROTOCOL_ISO_DEP;
cmd.mapping_configs[cmd.num_mapping_configs]
.mode = NCI_DISC_MAP_MODE_BOTH;
cmd.mapping_configs[cmd.num_mapping_configs]
.rf_interface_type = NCI_RF_INTERFACE_ISO_DEP;
cmd.num_mapping_configs++;
} else if (ndev->supported_rf_interfaces[i] ==
NCI_RF_INTERFACE_NFC_DEP) {
cmd.mapping_configs[cmd.num_mapping_configs]
.rf_protocol = NCI_RF_PROTOCOL_NFC_DEP;
cmd.mapping_configs[cmd.num_mapping_configs]
.mode = NCI_DISC_MAP_MODE_BOTH;
cmd.mapping_configs[cmd.num_mapping_configs]
.rf_interface_type = NCI_RF_INTERFACE_NFC_DEP;
cmd.num_mapping_configs++;
}
if (cmd.num_mapping_configs == NCI_MAX_NUM_MAPPING_CONFIGS)
break;
}
nci_send_cmd(ndev, NCI_OP_RF_DISCOVER_MAP_CMD,
(1 + (cmd.num_mapping_configs*sizeof(struct disc_map_config))),
&cmd);
}
static void nci_rf_discover_req(struct nci_dev *ndev, unsigned long opt)
{
struct nci_rf_disc_cmd cmd;
__u32 protocols = opt;
cmd.num_disc_configs = 0;
if ((cmd.num_disc_configs < NCI_MAX_NUM_RF_CONFIGS) &&
(protocols & NFC_PROTO_JEWEL_MASK
|| protocols & NFC_PROTO_MIFARE_MASK
|| protocols & NFC_PROTO_ISO14443_MASK
|| protocols & NFC_PROTO_NFC_DEP_MASK)) {
cmd.disc_configs[cmd.num_disc_configs].type =
NCI_DISCOVERY_TYPE_POLL_A_PASSIVE;
cmd.disc_configs[cmd.num_disc_configs].frequency = 1;
cmd.num_disc_configs++;
}
if ((cmd.num_disc_configs < NCI_MAX_NUM_RF_CONFIGS) &&
(protocols & NFC_PROTO_ISO14443_MASK)) {
cmd.disc_configs[cmd.num_disc_configs].type =
NCI_DISCOVERY_TYPE_POLL_B_PASSIVE;
cmd.disc_configs[cmd.num_disc_configs].frequency = 1;
cmd.num_disc_configs++;
}
if ((cmd.num_disc_configs < NCI_MAX_NUM_RF_CONFIGS) &&
(protocols & NFC_PROTO_FELICA_MASK
|| protocols & NFC_PROTO_NFC_DEP_MASK)) {
cmd.disc_configs[cmd.num_disc_configs].type =
NCI_DISCOVERY_TYPE_POLL_F_PASSIVE;
cmd.disc_configs[cmd.num_disc_configs].frequency = 1;
cmd.num_disc_configs++;
}
nci_send_cmd(ndev, NCI_OP_RF_DISCOVER_CMD,
(1 + (cmd.num_disc_configs*sizeof(struct disc_config))),
&cmd);
}
static void nci_rf_deactivate_req(struct nci_dev *ndev, unsigned long opt)
{
struct nci_rf_deactivate_cmd cmd;
cmd.type = NCI_DEACTIVATE_TYPE_IDLE_MODE;
nci_send_cmd(ndev, NCI_OP_RF_DEACTIVATE_CMD,
sizeof(struct nci_rf_deactivate_cmd),
&cmd);
}
static int nci_open_device(struct nci_dev *ndev)
{
int rc = 0;
mutex_lock(&ndev->req_lock);
if (test_bit(NCI_UP, &ndev->flags)) {
rc = -EALREADY;
goto done;
}
if (ndev->ops->open(ndev)) {
rc = -EIO;
goto done;
}
atomic_set(&ndev->cmd_cnt, 1);
set_bit(NCI_INIT, &ndev->flags);
rc = __nci_request(ndev, nci_reset_req, 0,
msecs_to_jiffies(NCI_RESET_TIMEOUT));
if (!rc) {
rc = __nci_request(ndev, nci_init_req, 0,
msecs_to_jiffies(NCI_INIT_TIMEOUT));
}
if (!rc) {
rc = __nci_request(ndev, nci_init_complete_req, 0,
msecs_to_jiffies(NCI_INIT_TIMEOUT));
}
clear_bit(NCI_INIT, &ndev->flags);
if (!rc) {
set_bit(NCI_UP, &ndev->flags);
} else {
/* Init failed, cleanup */
skb_queue_purge(&ndev->cmd_q);
skb_queue_purge(&ndev->rx_q);
skb_queue_purge(&ndev->tx_q);
ndev->ops->close(ndev);
ndev->flags = 0;
}
done:
mutex_unlock(&ndev->req_lock);
return rc;
}
static int nci_close_device(struct nci_dev *ndev)
{
nci_req_cancel(ndev, ENODEV);
mutex_lock(&ndev->req_lock);
if (!test_and_clear_bit(NCI_UP, &ndev->flags)) {
del_timer_sync(&ndev->cmd_timer);
mutex_unlock(&ndev->req_lock);
return 0;
}
/* Drop RX and TX queues */
skb_queue_purge(&ndev->rx_q);
skb_queue_purge(&ndev->tx_q);
/* Flush RX and TX wq */
flush_workqueue(ndev->rx_wq);
flush_workqueue(ndev->tx_wq);
/* Reset device */
skb_queue_purge(&ndev->cmd_q);
atomic_set(&ndev->cmd_cnt, 1);
set_bit(NCI_INIT, &ndev->flags);
__nci_request(ndev, nci_reset_req, 0,
msecs_to_jiffies(NCI_RESET_TIMEOUT));
clear_bit(NCI_INIT, &ndev->flags);
/* Flush cmd wq */
flush_workqueue(ndev->cmd_wq);
/* After this point our queues are empty
* and no works are scheduled. */
ndev->ops->close(ndev);
/* Clear flags */
ndev->flags = 0;
mutex_unlock(&ndev->req_lock);
return 0;
}
/* NCI command timer function */
static void nci_cmd_timer(unsigned long arg)
{
struct nci_dev *ndev = (void *) arg;
nfc_dbg("entry");
atomic_set(&ndev->cmd_cnt, 1);
queue_work(ndev->cmd_wq, &ndev->cmd_work);
}
static int nci_dev_up(struct nfc_dev *nfc_dev)
{
struct nci_dev *ndev = nfc_get_drvdata(nfc_dev);
nfc_dbg("entry");
return nci_open_device(ndev);
}
static int nci_dev_down(struct nfc_dev *nfc_dev)
{
struct nci_dev *ndev = nfc_get_drvdata(nfc_dev);
nfc_dbg("entry");
return nci_close_device(ndev);
}
static int nci_start_poll(struct nfc_dev *nfc_dev, __u32 protocols)
{
struct nci_dev *ndev = nfc_get_drvdata(nfc_dev);
int rc;
nfc_dbg("entry");
if (test_bit(NCI_DISCOVERY, &ndev->flags)) {
nfc_err("unable to start poll, since poll is already active");
return -EBUSY;
}
if (test_bit(NCI_POLL_ACTIVE, &ndev->flags)) {
nfc_dbg("target already active, first deactivate...");
rc = nci_request(ndev, nci_rf_deactivate_req, 0,
msecs_to_jiffies(NCI_RF_DEACTIVATE_TIMEOUT));
if (rc)
return -EBUSY;
}
rc = nci_request(ndev, nci_rf_discover_req, protocols,
msecs_to_jiffies(NCI_RF_DISC_TIMEOUT));
if (!rc)
ndev->poll_prots = protocols;
return rc;
}
static void nci_stop_poll(struct nfc_dev *nfc_dev)
{
struct nci_dev *ndev = nfc_get_drvdata(nfc_dev);
nfc_dbg("entry");
if (!test_bit(NCI_DISCOVERY, &ndev->flags)) {
nfc_err("unable to stop poll, since poll is not active");
return;
}
nci_request(ndev, nci_rf_deactivate_req, 0,
msecs_to_jiffies(NCI_RF_DEACTIVATE_TIMEOUT));
}
static int nci_activate_target(struct nfc_dev *nfc_dev, __u32 target_idx,
__u32 protocol)
{
struct nci_dev *ndev = nfc_get_drvdata(nfc_dev);
nfc_dbg("entry, target_idx %d, protocol 0x%x", target_idx, protocol);
if (!test_bit(NCI_POLL_ACTIVE, &ndev->flags)) {
nfc_err("there is no available target to activate");
return -EINVAL;
}
if (ndev->target_active_prot) {
nfc_err("there is already an active target");
return -EBUSY;
}
if (!(ndev->target_available_prots & (1 << protocol))) {
nfc_err("target does not support the requested protocol 0x%x",
protocol);
return -EINVAL;
}
ndev->target_active_prot = protocol;
ndev->target_available_prots = 0;
return 0;
}
static void nci_deactivate_target(struct nfc_dev *nfc_dev, __u32 target_idx)
{
struct nci_dev *ndev = nfc_get_drvdata(nfc_dev);
nfc_dbg("entry, target_idx %d", target_idx);
if (!ndev->target_active_prot) {
nfc_err("unable to deactivate target, no active target");
return;
}
ndev->target_active_prot = 0;
if (test_bit(NCI_POLL_ACTIVE, &ndev->flags)) {
nci_request(ndev, nci_rf_deactivate_req, 0,
msecs_to_jiffies(NCI_RF_DEACTIVATE_TIMEOUT));
}
}
static int nci_data_exchange(struct nfc_dev *nfc_dev, __u32 target_idx,
struct sk_buff *skb,
data_exchange_cb_t cb,
void *cb_context)
{
struct nci_dev *ndev = nfc_get_drvdata(nfc_dev);
nfc_dbg("entry, target_idx %d, len %d", target_idx, skb->len);
if (!ndev->target_active_prot) {
nfc_err("unable to exchange data, no active target");
return -EINVAL;
}
/* store cb and context to be used on receiving data */
ndev->data_exchange_cb = cb;
ndev->data_exchange_cb_context = cb_context;
return nci_send_data(ndev, ndev->conn_id, skb);
}
static struct nfc_ops nci_nfc_ops = {
.dev_up = nci_dev_up,
.dev_down = nci_dev_down,
.start_poll = nci_start_poll,
.stop_poll = nci_stop_poll,
.activate_target = nci_activate_target,
.deactivate_target = nci_deactivate_target,
.data_exchange = nci_data_exchange,
};
/* ---- Interface to NCI drivers ---- */
/**
* nci_allocate_device - allocate a new nci device
*
* @ops: device operations
* @supported_protocols: NFC protocols supported by the device
*/
struct nci_dev *nci_allocate_device(struct nci_ops *ops,
__u32 supported_protocols,
int tx_headroom,
int tx_tailroom)
{
struct nci_dev *ndev = NULL;
nfc_dbg("entry, supported_protocols 0x%x", supported_protocols);
if (!ops->open || !ops->close || !ops->send)
goto exit;
if (!supported_protocols)
goto exit;
ndev = kzalloc(sizeof(struct nci_dev), GFP_KERNEL);
if (!ndev)
goto exit;
ndev->ops = ops;
ndev->tx_headroom = tx_headroom;
ndev->tx_tailroom = tx_tailroom;
ndev->nfc_dev = nfc_allocate_device(&nci_nfc_ops,
supported_protocols,
tx_headroom + NCI_DATA_HDR_SIZE,
tx_tailroom);
if (!ndev->nfc_dev)
goto free_exit;
nfc_set_drvdata(ndev->nfc_dev, ndev);
goto exit;
free_exit:
kfree(ndev);
exit:
return ndev;
}
EXPORT_SYMBOL(nci_allocate_device);
/**
* nci_free_device - deallocate nci device
*
* @ndev: The nci device to deallocate
*/
void nci_free_device(struct nci_dev *ndev)
{
nfc_dbg("entry");
nfc_free_device(ndev->nfc_dev);
kfree(ndev);
}
EXPORT_SYMBOL(nci_free_device);
/**
* nci_register_device - register a nci device in the nfc subsystem
*
* @dev: The nci device to register
*/
int nci_register_device(struct nci_dev *ndev)
{
int rc;
struct device *dev = &ndev->nfc_dev->dev;
char name[32];
nfc_dbg("entry");
rc = nfc_register_device(ndev->nfc_dev);
if (rc)
goto exit;
ndev->flags = 0;
INIT_WORK(&ndev->cmd_work, nci_cmd_work);
snprintf(name, sizeof(name), "%s_nci_cmd_wq", dev_name(dev));
ndev->cmd_wq = create_singlethread_workqueue(name);
if (!ndev->cmd_wq) {
rc = -ENOMEM;
goto unreg_exit;
}
INIT_WORK(&ndev->rx_work, nci_rx_work);
snprintf(name, sizeof(name), "%s_nci_rx_wq", dev_name(dev));
ndev->rx_wq = create_singlethread_workqueue(name);
if (!ndev->rx_wq) {
rc = -ENOMEM;
goto destroy_cmd_wq_exit;
}
INIT_WORK(&ndev->tx_work, nci_tx_work);
snprintf(name, sizeof(name), "%s_nci_tx_wq", dev_name(dev));
ndev->tx_wq = create_singlethread_workqueue(name);
if (!ndev->tx_wq) {
rc = -ENOMEM;
goto destroy_rx_wq_exit;
}
skb_queue_head_init(&ndev->cmd_q);
skb_queue_head_init(&ndev->rx_q);
skb_queue_head_init(&ndev->tx_q);
setup_timer(&ndev->cmd_timer, nci_cmd_timer,
(unsigned long) ndev);
mutex_init(&ndev->req_lock);
goto exit;
destroy_rx_wq_exit:
destroy_workqueue(ndev->rx_wq);
destroy_cmd_wq_exit:
destroy_workqueue(ndev->cmd_wq);
unreg_exit:
nfc_unregister_device(ndev->nfc_dev);
exit:
return rc;
}
EXPORT_SYMBOL(nci_register_device);
/**
* nci_unregister_device - unregister a nci device in the nfc subsystem
*
* @dev: The nci device to unregister
*/
void nci_unregister_device(struct nci_dev *ndev)
{
nfc_dbg("entry");
nci_close_device(ndev);
destroy_workqueue(ndev->cmd_wq);
destroy_workqueue(ndev->rx_wq);
destroy_workqueue(ndev->tx_wq);
nfc_unregister_device(ndev->nfc_dev);
}
EXPORT_SYMBOL(nci_unregister_device);
/**
* nci_recv_frame - receive frame from NCI drivers
*
* @skb: The sk_buff to receive
*/
int nci_recv_frame(struct sk_buff *skb)
{
struct nci_dev *ndev = (struct nci_dev *) skb->dev;
nfc_dbg("entry, len %d", skb->len);
if (!ndev || (!test_bit(NCI_UP, &ndev->flags)
&& !test_bit(NCI_INIT, &ndev->flags))) {
kfree_skb(skb);
return -ENXIO;
}
/* Queue frame for rx worker thread */
skb_queue_tail(&ndev->rx_q, skb);
queue_work(ndev->rx_wq, &ndev->rx_work);
return 0;
}
EXPORT_SYMBOL(nci_recv_frame);
static int nci_send_frame(struct sk_buff *skb)
{
struct nci_dev *ndev = (struct nci_dev *) skb->dev;
nfc_dbg("entry, len %d", skb->len);
if (!ndev) {
kfree_skb(skb);
return -ENODEV;
}
/* Get rid of skb owner, prior to sending to the driver. */
skb_orphan(skb);
return ndev->ops->send(skb);
}
/* Send NCI command */
int nci_send_cmd(struct nci_dev *ndev, __u16 opcode, __u8 plen, void *payload)
{
struct nci_ctrl_hdr *hdr;
struct sk_buff *skb;
nfc_dbg("entry, opcode 0x%x, plen %d", opcode, plen);
skb = nci_skb_alloc(ndev, (NCI_CTRL_HDR_SIZE + plen), GFP_KERNEL);
if (!skb) {
nfc_err("no memory for command");
return -ENOMEM;
}
hdr = (struct nci_ctrl_hdr *) skb_put(skb, NCI_CTRL_HDR_SIZE);
hdr->gid = nci_opcode_gid(opcode);
hdr->oid = nci_opcode_oid(opcode);
hdr->plen = plen;
nci_mt_set((__u8 *)hdr, NCI_MT_CMD_PKT);
nci_pbf_set((__u8 *)hdr, NCI_PBF_LAST);
if (plen)
memcpy(skb_put(skb, plen), payload, plen);
skb->dev = (void *) ndev;
skb_queue_tail(&ndev->cmd_q, skb);
queue_work(ndev->cmd_wq, &ndev->cmd_work);
return 0;
}
/* ---- NCI TX Data worker thread ---- */
static void nci_tx_work(struct work_struct *work)
{
struct nci_dev *ndev = container_of(work, struct nci_dev, tx_work);
struct sk_buff *skb;
nfc_dbg("entry, credits_cnt %d", atomic_read(&ndev->credits_cnt));
/* Send queued tx data */
while (atomic_read(&ndev->credits_cnt)) {
skb = skb_dequeue(&ndev->tx_q);
if (!skb)
return;
atomic_dec(&ndev->credits_cnt);
nfc_dbg("NCI TX: MT=data, PBF=%d, conn_id=%d, plen=%d",
nci_pbf(skb->data),
nci_conn_id(skb->data),
nci_plen(skb->data));
nci_send_frame(skb);
}
}
/* ----- NCI RX worker thread (data & control) ----- */
static void nci_rx_work(struct work_struct *work)
{
struct nci_dev *ndev = container_of(work, struct nci_dev, rx_work);
struct sk_buff *skb;
while ((skb = skb_dequeue(&ndev->rx_q))) {
/* Process frame */
switch (nci_mt(skb->data)) {
case NCI_MT_RSP_PKT:
nci_rsp_packet(ndev, skb);
break;
case NCI_MT_NTF_PKT:
nci_ntf_packet(ndev, skb);
break;
case NCI_MT_DATA_PKT:
nci_rx_data_packet(ndev, skb);
break;
default:
nfc_err("unknown MT 0x%x", nci_mt(skb->data));
kfree_skb(skb);
break;
}
}
}
/* ----- NCI TX CMD worker thread ----- */
static void nci_cmd_work(struct work_struct *work)
{
struct nci_dev *ndev = container_of(work, struct nci_dev, cmd_work);
struct sk_buff *skb;
nfc_dbg("entry, cmd_cnt %d", atomic_read(&ndev->cmd_cnt));
/* Send queued command */
if (atomic_read(&ndev->cmd_cnt)) {
skb = skb_dequeue(&ndev->cmd_q);
if (!skb)
return;
atomic_dec(&ndev->cmd_cnt);
nfc_dbg("NCI TX: MT=cmd, PBF=%d, GID=0x%x, OID=0x%x, plen=%d",
nci_pbf(skb->data),
nci_opcode_gid(nci_opcode(skb->data)),
nci_opcode_oid(nci_opcode(skb->data)),
nci_plen(skb->data));
nci_send_frame(skb);
mod_timer(&ndev->cmd_timer,
jiffies + msecs_to_jiffies(NCI_CMD_TIMEOUT));
}
}

245
net/nfc/nci/data.c Normal file
View File

@ -0,0 +1,245 @@
/*
* 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>
*
* 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
*
*/
#include <linux/types.h>
#include <linux/interrupt.h>
#include <linux/wait.h>
#include <linux/bitops.h>
#include <linux/skbuff.h>
#include "../nfc.h"
#include <net/nfc/nci.h>
#include <net/nfc/nci_core.h>
#include <linux/nfc.h>
/* Complete data exchange transaction and forward skb to nfc core */
void nci_data_exchange_complete(struct nci_dev *ndev,
struct sk_buff *skb,
int err)
{
data_exchange_cb_t cb = ndev->data_exchange_cb;
void *cb_context = ndev->data_exchange_cb_context;
nfc_dbg("entry, len %d, err %d", ((skb) ? (skb->len) : (0)), err);
if (cb) {
ndev->data_exchange_cb = NULL;
ndev->data_exchange_cb_context = 0;
/* forward skb to nfc core */
cb(cb_context, skb, err);
} else if (skb) {
nfc_err("no rx callback, dropping rx data...");
/* no waiting callback, free skb */
kfree_skb(skb);
}
}
/* ----------------- NCI TX Data ----------------- */
static inline void nci_push_data_hdr(struct nci_dev *ndev,
__u8 conn_id,
struct sk_buff *skb,
__u8 pbf)
{
struct nci_data_hdr *hdr;
int plen = skb->len;
hdr = (struct nci_data_hdr *) skb_push(skb, NCI_DATA_HDR_SIZE);
hdr->conn_id = conn_id;
hdr->rfu = 0;
hdr->plen = plen;
nci_mt_set((__u8 *)hdr, NCI_MT_DATA_PKT);
nci_pbf_set((__u8 *)hdr, pbf);
skb->dev = (void *) ndev;
}
static int nci_queue_tx_data_frags(struct nci_dev *ndev,
__u8 conn_id,
struct sk_buff *skb) {
int total_len = skb->len;
unsigned char *data = skb->data;
unsigned long flags;
struct sk_buff_head frags_q;
struct sk_buff *skb_frag;
int frag_len;
int rc = 0;
nfc_dbg("entry, conn_id 0x%x, total_len %d", conn_id, total_len);
__skb_queue_head_init(&frags_q);
while (total_len) {
frag_len = min_t(int, total_len, ndev->max_pkt_payload_size);
skb_frag = nci_skb_alloc(ndev,
(NCI_DATA_HDR_SIZE + frag_len),
GFP_KERNEL);
if (skb_frag == NULL) {
rc = -ENOMEM;
goto free_exit;
}
skb_reserve(skb_frag, NCI_DATA_HDR_SIZE);
/* first, copy the data */
memcpy(skb_put(skb_frag, frag_len), data, frag_len);
/* second, set the header */
nci_push_data_hdr(ndev, conn_id, skb_frag,
((total_len == frag_len) ? (NCI_PBF_LAST) : (NCI_PBF_CONT)));
__skb_queue_tail(&frags_q, skb_frag);
data += frag_len;
total_len -= frag_len;
nfc_dbg("frag_len %d, remaining total_len %d",
frag_len, total_len);
}
/* queue all fragments atomically */
spin_lock_irqsave(&ndev->tx_q.lock, flags);
while ((skb_frag = __skb_dequeue(&frags_q)) != NULL)
__skb_queue_tail(&ndev->tx_q, skb_frag);
spin_unlock_irqrestore(&ndev->tx_q.lock, flags);
/* free the original skb */
kfree_skb(skb);
goto exit;
free_exit:
while ((skb_frag = __skb_dequeue(&frags_q)) != NULL)
kfree_skb(skb_frag);
exit:
return rc;
}
/* Send NCI data */
int nci_send_data(struct nci_dev *ndev, __u8 conn_id, struct sk_buff *skb)
{
int rc = 0;
nfc_dbg("entry, conn_id 0x%x, plen %d", conn_id, skb->len);
/* check if the packet need to be fragmented */
if (skb->len <= ndev->max_pkt_payload_size) {
/* no need to fragment packet */
nci_push_data_hdr(ndev, conn_id, skb, NCI_PBF_LAST);
skb_queue_tail(&ndev->tx_q, skb);
} else {
/* fragment packet and queue the fragments */
rc = nci_queue_tx_data_frags(ndev, conn_id, skb);
if (rc) {
nfc_err("failed to fragment tx data packet");
goto free_exit;
}
}
queue_work(ndev->tx_wq, &ndev->tx_work);
goto exit;
free_exit:
kfree_skb(skb);
exit:
return rc;
}
/* ----------------- NCI RX Data ----------------- */
static void nci_add_rx_data_frag(struct nci_dev *ndev,
struct sk_buff *skb,
__u8 pbf)
{
int reassembly_len;
int err = 0;
if (ndev->rx_data_reassembly) {
reassembly_len = ndev->rx_data_reassembly->len;
/* first, make enough room for the already accumulated data */
if (skb_cow_head(skb, reassembly_len)) {
nfc_err("error adding room for accumulated rx data");
kfree_skb(skb);
skb = 0;
kfree_skb(ndev->rx_data_reassembly);
ndev->rx_data_reassembly = 0;
err = -ENOMEM;
goto exit;
}
/* second, combine the two fragments */
memcpy(skb_push(skb, reassembly_len),
ndev->rx_data_reassembly->data,
reassembly_len);
/* third, free old reassembly */
kfree_skb(ndev->rx_data_reassembly);
ndev->rx_data_reassembly = 0;
}
if (pbf == NCI_PBF_CONT) {
/* need to wait for next fragment, store skb and exit */
ndev->rx_data_reassembly = skb;
return;
}
exit:
nci_data_exchange_complete(ndev, skb, err);
}
/* Rx Data packet */
void nci_rx_data_packet(struct nci_dev *ndev, struct sk_buff *skb)
{
__u8 pbf = nci_pbf(skb->data);
nfc_dbg("entry, len %d", skb->len);
nfc_dbg("NCI RX: MT=data, PBF=%d, conn_id=%d, plen=%d",
nci_pbf(skb->data),
nci_conn_id(skb->data),
nci_plen(skb->data));
/* strip the nci data header */
skb_pull(skb, NCI_DATA_HDR_SIZE);
if (ndev->target_active_prot == NFC_PROTO_MIFARE) {
/* frame I/F => remove the status byte */
nfc_dbg("NFC_PROTO_MIFARE => remove the status byte");
skb_trim(skb, (skb->len - 1));
}
nci_add_rx_data_frag(ndev, skb, pbf);
}

94
net/nfc/nci/lib.c Normal file
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@ -0,0 +1,94 @@
/*
* 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 lib.c, 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
*
*/
#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/types.h>
#include <linux/errno.h>
#include <net/nfc/nci.h>
/* NCI status codes to Unix errno mapping */
int nci_to_errno(__u8 code)
{
switch (code) {
case NCI_STATUS_OK:
return 0;
case NCI_STATUS_REJECTED:
return -EBUSY;
case NCI_STATUS_MESSAGE_CORRUPTED:
return -EBADMSG;
case NCI_STATUS_BUFFER_FULL:
return -ENOBUFS;
case NCI_STATUS_NOT_INITIALIZED:
return -EHOSTDOWN;
case NCI_STATUS_SYNTAX_ERROR:
case NCI_STATUS_SEMANTIC_ERROR:
case NCI_STATUS_INVALID_PARAM:
case NCI_STATUS_RF_PROTOCOL_ERROR:
case NCI_STATUS_NFCEE_PROTOCOL_ERROR:
return -EPROTO;
case NCI_STATUS_UNKNOWN_GID:
case NCI_STATUS_UNKNOWN_OID:
return -EBADRQC;
case NCI_STATUS_MESSAGE_SIZE_EXCEEDED:
return -EMSGSIZE;
case NCI_STATUS_DISCOVERY_ALREADY_STARTED:
return -EALREADY;
case NCI_STATUS_DISCOVERY_TARGET_ACTIVATION_FAILED:
case NCI_STATUS_NFCEE_INTERFACE_ACTIVATION_FAILED:
return -ECONNREFUSED;
case NCI_STATUS_RF_TRANSMISSION_ERROR:
case NCI_STATUS_NFCEE_TRANSMISSION_ERROR:
return -ECOMM;
case NCI_STATUS_RF_TIMEOUT_ERROR:
case NCI_STATUS_NFCEE_TIMEOUT_ERROR:
return -ETIMEDOUT;
case NCI_STATUS_RF_LINK_LOSS_ERROR:
return -ENOLINK;
case NCI_STATUS_MAX_ACTIVE_NFCEE_INTERFACES_REACHED:
return -EDQUOT;
case NCI_STATUS_FAILED:
default:
return -ENOSYS;
}
}
EXPORT_SYMBOL(nci_to_errno);

258
net/nfc/nci/ntf.c Normal file
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@ -0,0 +1,258 @@
/*
* 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_event.c, 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
*
*/
#include <linux/types.h>
#include <linux/interrupt.h>
#include <linux/bitops.h>
#include <linux/skbuff.h>
#include "../nfc.h"
#include <net/nfc/nci.h>
#include <net/nfc/nci_core.h>
#include <linux/nfc.h>
/* Handle NCI Notification packets */
static void nci_core_conn_credits_ntf_packet(struct nci_dev *ndev,
struct sk_buff *skb)
{
struct nci_core_conn_credit_ntf *ntf = (void *) skb->data;
int i;
nfc_dbg("entry, num_entries %d", ntf->num_entries);
if (ntf->num_entries > NCI_MAX_NUM_CONN)
ntf->num_entries = NCI_MAX_NUM_CONN;
/* update the credits */
for (i = 0; i < ntf->num_entries; i++) {
nfc_dbg("entry[%d]: conn_id %d, credits %d", i,
ntf->conn_entries[i].conn_id,
ntf->conn_entries[i].credits);
if (ntf->conn_entries[i].conn_id == ndev->conn_id) {
/* found static rf connection */
atomic_add(ntf->conn_entries[i].credits,
&ndev->credits_cnt);
}
}
/* trigger the next tx */
if (!skb_queue_empty(&ndev->tx_q))
queue_work(ndev->tx_wq, &ndev->tx_work);
}
static void nci_rf_field_info_ntf_packet(struct nci_dev *ndev,
struct sk_buff *skb)
{
struct nci_rf_field_info_ntf *ntf = (void *) skb->data;
nfc_dbg("entry, rf_field_status %d", ntf->rf_field_status);
}
static int nci_rf_activate_nfca_passive_poll(struct nci_dev *ndev,
struct nci_rf_activate_ntf *ntf, __u8 *data)
{
struct rf_tech_specific_params_nfca_poll *nfca_poll;
struct activation_params_nfca_poll_iso_dep *nfca_poll_iso_dep;
nfca_poll = &ntf->rf_tech_specific_params.nfca_poll;
nfca_poll_iso_dep = &ntf->activation_params.nfca_poll_iso_dep;
nfca_poll->sens_res = __le16_to_cpu(*((__u16 *)data));
data += 2;
nfca_poll->nfcid1_len = *data++;
nfc_dbg("sens_res 0x%x, nfcid1_len %d",
nfca_poll->sens_res,
nfca_poll->nfcid1_len);
memcpy(nfca_poll->nfcid1, data, nfca_poll->nfcid1_len);
data += nfca_poll->nfcid1_len;
nfca_poll->sel_res_len = *data++;
if (nfca_poll->sel_res_len != 0)
nfca_poll->sel_res = *data++;
ntf->rf_interface_type = *data++;
ntf->activation_params_len = *data++;
nfc_dbg("sel_res_len %d, sel_res 0x%x, rf_interface_type %d, activation_params_len %d",
nfca_poll->sel_res_len,
nfca_poll->sel_res,
ntf->rf_interface_type,
ntf->activation_params_len);
switch (ntf->rf_interface_type) {
case NCI_RF_INTERFACE_ISO_DEP:
nfca_poll_iso_dep->rats_res_len = *data++;
if (nfca_poll_iso_dep->rats_res_len > 0) {
memcpy(nfca_poll_iso_dep->rats_res,
data,
nfca_poll_iso_dep->rats_res_len);
}
break;
case NCI_RF_INTERFACE_FRAME:
/* no activation params */
break;
default:
nfc_err("unsupported rf_interface_type 0x%x",
ntf->rf_interface_type);
return -EPROTO;
}
return 0;
}
static void nci_target_found(struct nci_dev *ndev,
struct nci_rf_activate_ntf *ntf)
{
struct nfc_target nfc_tgt;
if (ntf->rf_protocol == NCI_RF_PROTOCOL_T2T) /* T2T MifareUL */
nfc_tgt.supported_protocols = NFC_PROTO_MIFARE_MASK;
else if (ntf->rf_protocol == NCI_RF_PROTOCOL_ISO_DEP) /* 4A */
nfc_tgt.supported_protocols = NFC_PROTO_ISO14443_MASK;
nfc_tgt.sens_res = ntf->rf_tech_specific_params.nfca_poll.sens_res;
nfc_tgt.sel_res = ntf->rf_tech_specific_params.nfca_poll.sel_res;
if (!(nfc_tgt.supported_protocols & ndev->poll_prots)) {
nfc_dbg("the target found does not have the desired protocol");
return;
}
nfc_dbg("new target found, supported_protocols 0x%x",
nfc_tgt.supported_protocols);
ndev->target_available_prots = nfc_tgt.supported_protocols;
nfc_targets_found(ndev->nfc_dev, &nfc_tgt, 1);
}
static void nci_rf_activate_ntf_packet(struct nci_dev *ndev,
struct sk_buff *skb)
{
struct nci_rf_activate_ntf ntf;
__u8 *data = skb->data;
int rc = -1;
clear_bit(NCI_DISCOVERY, &ndev->flags);
set_bit(NCI_POLL_ACTIVE, &ndev->flags);
ntf.target_handle = *data++;
ntf.rf_protocol = *data++;
ntf.rf_tech_and_mode = *data++;
ntf.rf_tech_specific_params_len = *data++;
nfc_dbg("target_handle %d, rf_protocol 0x%x, rf_tech_and_mode 0x%x, rf_tech_specific_params_len %d",
ntf.target_handle,
ntf.rf_protocol,
ntf.rf_tech_and_mode,
ntf.rf_tech_specific_params_len);
switch (ntf.rf_tech_and_mode) {
case NCI_NFC_A_PASSIVE_POLL_MODE:
rc = nci_rf_activate_nfca_passive_poll(ndev, &ntf,
data);
break;
default:
nfc_err("unsupported rf_tech_and_mode 0x%x",
ntf.rf_tech_and_mode);
return;
}
if (!rc)
nci_target_found(ndev, &ntf);
}
static void nci_rf_deactivate_ntf_packet(struct nci_dev *ndev,
struct sk_buff *skb)
{
__u8 type = skb->data[0];
nfc_dbg("entry, type 0x%x", type);
clear_bit(NCI_POLL_ACTIVE, &ndev->flags);
ndev->target_active_prot = 0;
/* drop tx data queue */
skb_queue_purge(&ndev->tx_q);
/* drop partial rx data packet */
if (ndev->rx_data_reassembly) {
kfree_skb(ndev->rx_data_reassembly);
ndev->rx_data_reassembly = 0;
}
/* complete the data exchange transaction, if exists */
if (ndev->data_exchange_cb)
nci_data_exchange_complete(ndev, NULL, -EIO);
}
void nci_ntf_packet(struct nci_dev *ndev, struct sk_buff *skb)
{
__u16 ntf_opcode = nci_opcode(skb->data);
nfc_dbg("NCI RX: MT=ntf, PBF=%d, GID=0x%x, OID=0x%x, plen=%d",
nci_pbf(skb->data),
nci_opcode_gid(ntf_opcode),
nci_opcode_oid(ntf_opcode),
nci_plen(skb->data));
/* strip the nci control header */
skb_pull(skb, NCI_CTRL_HDR_SIZE);
switch (ntf_opcode) {
case NCI_OP_CORE_CONN_CREDITS_NTF:
nci_core_conn_credits_ntf_packet(ndev, skb);
break;
case NCI_OP_RF_FIELD_INFO_NTF:
nci_rf_field_info_ntf_packet(ndev, skb);
break;
case NCI_OP_RF_ACTIVATE_NTF:
nci_rf_activate_ntf_packet(ndev, skb);
break;
case NCI_OP_RF_DEACTIVATE_NTF:
nci_rf_deactivate_ntf_packet(ndev, skb);
break;
default:
nfc_err("unknown ntf opcode 0x%x", ntf_opcode);
break;
}
kfree_skb(skb);
}

226
net/nfc/nci/rsp.c Normal file
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@ -0,0 +1,226 @@
/*
* 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_event.c, 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
*
*/
#include <linux/types.h>
#include <linux/interrupt.h>
#include <linux/bitops.h>
#include <linux/skbuff.h>
#include "../nfc.h"
#include <net/nfc/nci.h>
#include <net/nfc/nci_core.h>
/* Handle NCI Response packets */
static void nci_core_reset_rsp_packet(struct nci_dev *ndev, struct sk_buff *skb)
{
struct nci_core_reset_rsp *rsp = (void *) skb->data;
nfc_dbg("entry, status 0x%x", rsp->status);
if (rsp->status == NCI_STATUS_OK)
ndev->nci_ver = rsp->nci_ver;
nfc_dbg("nci_ver 0x%x", ndev->nci_ver);
nci_req_complete(ndev, rsp->status);
}
static void nci_core_init_rsp_packet(struct nci_dev *ndev, struct sk_buff *skb)
{
struct nci_core_init_rsp_1 *rsp_1 = (void *) skb->data;
struct nci_core_init_rsp_2 *rsp_2;
nfc_dbg("entry, status 0x%x", rsp_1->status);
if (rsp_1->status != NCI_STATUS_OK)
return;
ndev->nfcc_features = __le32_to_cpu(rsp_1->nfcc_features);
ndev->num_supported_rf_interfaces = rsp_1->num_supported_rf_interfaces;
if (ndev->num_supported_rf_interfaces >
NCI_MAX_SUPPORTED_RF_INTERFACES) {
ndev->num_supported_rf_interfaces =
NCI_MAX_SUPPORTED_RF_INTERFACES;
}
memcpy(ndev->supported_rf_interfaces,
rsp_1->supported_rf_interfaces,
ndev->num_supported_rf_interfaces);
rsp_2 = (void *) (skb->data + 6 + ndev->num_supported_rf_interfaces);
ndev->max_logical_connections =
rsp_2->max_logical_connections;
ndev->max_routing_table_size =
__le16_to_cpu(rsp_2->max_routing_table_size);
ndev->max_control_packet_payload_length =
rsp_2->max_control_packet_payload_length;
ndev->rf_sending_buffer_size =
__le16_to_cpu(rsp_2->rf_sending_buffer_size);
ndev->rf_receiving_buffer_size =
__le16_to_cpu(rsp_2->rf_receiving_buffer_size);
ndev->manufacturer_id =
__le16_to_cpu(rsp_2->manufacturer_id);
nfc_dbg("nfcc_features 0x%x",
ndev->nfcc_features);
nfc_dbg("num_supported_rf_interfaces %d",
ndev->num_supported_rf_interfaces);
nfc_dbg("supported_rf_interfaces[0] 0x%x",
ndev->supported_rf_interfaces[0]);
nfc_dbg("supported_rf_interfaces[1] 0x%x",
ndev->supported_rf_interfaces[1]);
nfc_dbg("supported_rf_interfaces[2] 0x%x",
ndev->supported_rf_interfaces[2]);
nfc_dbg("supported_rf_interfaces[3] 0x%x",
ndev->supported_rf_interfaces[3]);
nfc_dbg("max_logical_connections %d",
ndev->max_logical_connections);
nfc_dbg("max_routing_table_size %d",
ndev->max_routing_table_size);
nfc_dbg("max_control_packet_payload_length %d",
ndev->max_control_packet_payload_length);
nfc_dbg("rf_sending_buffer_size %d",
ndev->rf_sending_buffer_size);
nfc_dbg("rf_receiving_buffer_size %d",
ndev->rf_receiving_buffer_size);
nfc_dbg("manufacturer_id 0x%x",
ndev->manufacturer_id);
nci_req_complete(ndev, rsp_1->status);
}
static void nci_core_conn_create_rsp_packet(struct nci_dev *ndev,
struct sk_buff *skb)
{
struct nci_core_conn_create_rsp *rsp = (void *) skb->data;
nfc_dbg("entry, status 0x%x", rsp->status);
if (rsp->status != NCI_STATUS_OK)
return;
ndev->max_pkt_payload_size = rsp->max_pkt_payload_size;
ndev->initial_num_credits = rsp->initial_num_credits;
ndev->conn_id = rsp->conn_id;
atomic_set(&ndev->credits_cnt, ndev->initial_num_credits);
nfc_dbg("max_pkt_payload_size %d", ndev->max_pkt_payload_size);
nfc_dbg("initial_num_credits %d", ndev->initial_num_credits);
nfc_dbg("conn_id %d", ndev->conn_id);
}
static void nci_rf_disc_map_rsp_packet(struct nci_dev *ndev,
struct sk_buff *skb)
{
__u8 status = skb->data[0];
nfc_dbg("entry, status 0x%x", status);
nci_req_complete(ndev, status);
}
static void nci_rf_disc_rsp_packet(struct nci_dev *ndev, struct sk_buff *skb)
{
__u8 status = skb->data[0];
nfc_dbg("entry, status 0x%x", status);
if (status == NCI_STATUS_OK)
set_bit(NCI_DISCOVERY, &ndev->flags);
nci_req_complete(ndev, status);
}
static void nci_rf_deactivate_rsp_packet(struct nci_dev *ndev,
struct sk_buff *skb)
{
__u8 status = skb->data[0];
nfc_dbg("entry, status 0x%x", status);
clear_bit(NCI_DISCOVERY, &ndev->flags);
nci_req_complete(ndev, status);
}
void nci_rsp_packet(struct nci_dev *ndev, struct sk_buff *skb)
{
__u16 rsp_opcode = nci_opcode(skb->data);
/* we got a rsp, stop the cmd timer */
del_timer(&ndev->cmd_timer);
nfc_dbg("NCI RX: MT=rsp, PBF=%d, GID=0x%x, OID=0x%x, plen=%d",
nci_pbf(skb->data),
nci_opcode_gid(rsp_opcode),
nci_opcode_oid(rsp_opcode),
nci_plen(skb->data));
/* strip the nci control header */
skb_pull(skb, NCI_CTRL_HDR_SIZE);
switch (rsp_opcode) {
case NCI_OP_CORE_RESET_RSP:
nci_core_reset_rsp_packet(ndev, skb);
break;
case NCI_OP_CORE_INIT_RSP:
nci_core_init_rsp_packet(ndev, skb);
break;
case NCI_OP_CORE_CONN_CREATE_RSP:
nci_core_conn_create_rsp_packet(ndev, skb);
break;
case NCI_OP_RF_DISCOVER_MAP_RSP:
nci_rf_disc_map_rsp_packet(ndev, skb);
break;
case NCI_OP_RF_DISCOVER_RSP:
nci_rf_disc_rsp_packet(ndev, skb);
break;
case NCI_OP_RF_DEACTIVATE_RSP:
nci_rf_deactivate_rsp_packet(ndev, skb);
break;
default:
nfc_err("unknown rsp opcode 0x%x", rsp_opcode);
break;
}
kfree_skb(skb);
/* trigger the next cmd */
atomic_set(&ndev->cmd_cnt, 1);
if (!skb_queue_empty(&ndev->cmd_q))
queue_work(ndev->cmd_wq, &ndev->cmd_work);
}