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android_kernel_xiaomi_sm7250/net/nfc/llcp/llcp.h
Samuel Ortiz 8f50020ed9 NFC: LLCP late binding 
With the LLCP 16 local SAPs we can potentially quickly run out of source
SAPs for non well known services.
With the so called late binding we will reserve an SAP only when we actually
get a client connection for a local service. The SAP will be released once
the last client is gone, leaving it available to other services.

Signed-off-by: Samuel Ortiz <sameo@linux.intel.com>
2012-07-09 16:42:19 -04:00

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/*
* Copyright (C) 2011 Intel Corporation. All rights reserved.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* 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.
*/
enum llcp_state {
LLCP_CONNECTED = 1, /* wait_for_packet() wants that */
LLCP_CLOSED,
LLCP_BOUND,
LLCP_LISTEN,
};
#define LLCP_DEFAULT_LTO 100
#define LLCP_DEFAULT_RW 1
#define LLCP_DEFAULT_MIU 128
#define LLCP_MAX_LTO 0xff
#define LLCP_MAX_RW 15
#define LLCP_MAX_MIUX 0x7ff
#define LLCP_WKS_NUM_SAP 16
#define LLCP_SDP_NUM_SAP 16
#define LLCP_LOCAL_NUM_SAP 32
#define LLCP_LOCAL_SAP_OFFSET (LLCP_WKS_NUM_SAP + LLCP_SDP_NUM_SAP)
#define LLCP_MAX_SAP (LLCP_WKS_NUM_SAP + LLCP_SDP_NUM_SAP + LLCP_LOCAL_NUM_SAP)
#define LLCP_SDP_UNBOUND (LLCP_MAX_SAP + 1)
struct nfc_llcp_sock;
struct llcp_sock_list {
struct hlist_head head;
rwlock_t lock;
};
struct nfc_llcp_local {
struct list_head list;
struct nfc_dev *dev;
struct kref ref;
struct mutex sdp_lock;
struct timer_list link_timer;
struct sk_buff_head tx_queue;
struct workqueue_struct *tx_wq;
struct work_struct tx_work;
struct workqueue_struct *rx_wq;
struct work_struct rx_work;
struct sk_buff *rx_pending;
struct workqueue_struct *timeout_wq;
struct work_struct timeout_work;
u32 target_idx;
u8 rf_mode;
u8 comm_mode;
unsigned long local_wks; /* Well known services */
unsigned long local_sdp; /* Local services */
unsigned long local_sap; /* Local SAPs, not available for discovery */
atomic_t local_sdp_cnt[LLCP_SDP_NUM_SAP];
/* local */
u8 gb[NFC_MAX_GT_LEN];
u8 gb_len;
/* remote */
u8 remote_gb[NFC_MAX_GT_LEN];
u8 remote_gb_len;
u8 remote_version;
u16 remote_miu;
u16 remote_lto;
u8 remote_opt;
u16 remote_wks;
/* sockets array */
struct llcp_sock_list sockets;
struct llcp_sock_list connecting_sockets;
};
struct nfc_llcp_sock {
struct sock sk;
struct nfc_dev *dev;
struct nfc_llcp_local *local;
u32 target_idx;
u32 nfc_protocol;
/* Link parameters */
u8 ssap;
u8 dsap;
char *service_name;
size_t service_name_len;
u8 rw;
u16 miu;
/* Link variables */
u8 send_n;
u8 send_ack_n;
u8 recv_n;
u8 recv_ack_n;
/* Is the remote peer ready to receive */
u8 remote_ready;
/* Reserved source SAP */
u8 reserved_ssap;
struct sk_buff_head tx_queue;
struct sk_buff_head tx_pending_queue;
struct sk_buff_head tx_backlog_queue;
struct list_head accept_queue;
struct sock *parent;
};
#define nfc_llcp_sock(sk) ((struct nfc_llcp_sock *) (sk))
#define nfc_llcp_dev(sk) (nfc_llcp_sock((sk))->dev)
#define LLCP_HEADER_SIZE 2
#define LLCP_SEQUENCE_SIZE 1
/* LLCP versions: 1.1 is 1.0 plus SDP */
#define LLCP_VERSION_10 0x10
#define LLCP_VERSION_11 0x11
/* LLCP PDU types */
#define LLCP_PDU_SYMM 0x0
#define LLCP_PDU_PAX 0x1
#define LLCP_PDU_AGF 0x2
#define LLCP_PDU_UI 0x3
#define LLCP_PDU_CONNECT 0x4
#define LLCP_PDU_DISC 0x5
#define LLCP_PDU_CC 0x6
#define LLCP_PDU_DM 0x7
#define LLCP_PDU_FRMR 0x8
#define LLCP_PDU_SNL 0x9
#define LLCP_PDU_I 0xc
#define LLCP_PDU_RR 0xd
#define LLCP_PDU_RNR 0xe
/* Parameters TLV types */
#define LLCP_TLV_VERSION 0x1
#define LLCP_TLV_MIUX 0x2
#define LLCP_TLV_WKS 0x3
#define LLCP_TLV_LTO 0x4
#define LLCP_TLV_RW 0x5
#define LLCP_TLV_SN 0x6
#define LLCP_TLV_OPT 0x7
#define LLCP_TLV_SDREQ 0x8
#define LLCP_TLV_SDRES 0x9
#define LLCP_TLV_MAX 0xa
/* Well known LLCP SAP */
#define LLCP_SAP_SDP 0x1
#define LLCP_SAP_IP 0x2
#define LLCP_SAP_OBEX 0x3
#define LLCP_SAP_SNEP 0x4
#define LLCP_SAP_MAX 0xff
/* Disconnection reason code */
#define LLCP_DM_DISC 0x00
#define LLCP_DM_NOCONN 0x01
#define LLCP_DM_NOBOUND 0x02
#define LLCP_DM_REJ 0x03
void nfc_llcp_sock_link(struct llcp_sock_list *l, struct sock *s);
void nfc_llcp_sock_unlink(struct llcp_sock_list *l, struct sock *s);
struct nfc_llcp_local *nfc_llcp_find_local(struct nfc_dev *dev);
struct nfc_llcp_local *nfc_llcp_local_get(struct nfc_llcp_local *local);
int nfc_llcp_local_put(struct nfc_llcp_local *local);
u8 nfc_llcp_get_sdp_ssap(struct nfc_llcp_local *local,
struct nfc_llcp_sock *sock);
u8 nfc_llcp_get_local_ssap(struct nfc_llcp_local *local);
void nfc_llcp_put_ssap(struct nfc_llcp_local *local, u8 ssap);
int nfc_llcp_queue_i_frames(struct nfc_llcp_sock *sock);
/* Sock API */
struct sock *nfc_llcp_sock_alloc(struct socket *sock, int type, gfp_t gfp);
void nfc_llcp_sock_free(struct nfc_llcp_sock *sock);
void nfc_llcp_accept_unlink(struct sock *sk);
void nfc_llcp_accept_enqueue(struct sock *parent, struct sock *sk);
struct sock *nfc_llcp_accept_dequeue(struct sock *sk, struct socket *newsock);
/* TLV API */
int nfc_llcp_parse_gb_tlv(struct nfc_llcp_local *local,
u8 *tlv_array, u16 tlv_array_len);
int nfc_llcp_parse_connection_tlv(struct nfc_llcp_sock *sock,
u8 *tlv_array, u16 tlv_array_len);
/* Commands API */
void nfc_llcp_recv(void *data, struct sk_buff *skb, int err);
u8 *nfc_llcp_build_tlv(u8 type, u8 *value, u8 value_length, u8 *tlv_length);
void nfc_llcp_recv(void *data, struct sk_buff *skb, int err);
int nfc_llcp_disconnect(struct nfc_llcp_sock *sock);
int nfc_llcp_send_symm(struct nfc_dev *dev);
int nfc_llcp_send_connect(struct nfc_llcp_sock *sock);
int nfc_llcp_send_cc(struct nfc_llcp_sock *sock);
int nfc_llcp_send_dm(struct nfc_llcp_local *local, u8 ssap, u8 dsap, u8 reason);
int nfc_llcp_send_disconnect(struct nfc_llcp_sock *sock);
int nfc_llcp_send_i_frame(struct nfc_llcp_sock *sock,
struct msghdr *msg, size_t len);
int nfc_llcp_send_rr(struct nfc_llcp_sock *sock);
/* Socket API */
int __init nfc_llcp_sock_init(void);
void nfc_llcp_sock_exit(void);
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