/*
   * 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, see <http://www.gnu.org/licenses/>.
   */
  
  enum llcp_state {
  	LLCP_CONNECTED = 1, /* wait_for_packet() wants that */
  	LLCP_CONNECTING,
  	LLCP_DISCONNECTING,
  	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_MAX_MIU (LLCP_MAX_MIUX + 128)
  
  #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_sdp_tlv {
  	u8 *tlv;
  	u8 tlv_len;
  
  	char *uri;
  	u8 tid;
  	u8 sap;
  
  	unsigned long time;
  
  	struct hlist_node node;
  };
  
  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 work_struct	 tx_work;
  	struct work_struct	 rx_work;
  	struct sk_buff *rx_pending;
  	struct work_struct	 timeout_work;
  
  	u32 target_idx;
  	u8 rf_mode;
  	u8 comm_mode;
  	u8 lto;
  	u8 rw;
  	__be16 miux;
  	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;
  
  	struct mutex sdreq_lock;
  	struct hlist_head pending_sdreqs;
  	struct timer_list sdreq_timer;
  	struct work_struct sdreq_timeout_work;
  	u8 sdreq_next_tid;
  
  	/* sockets array */
  	struct llcp_sock_list sockets;
  	struct llcp_sock_list connecting_sockets;
  	struct llcp_sock_list raw_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;
  	__be16 miux;
  
  
  	/* Remote link parameters */
  	u8 remote_rw;
  	u16 remote_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 list_head accept_queue;
  	struct sock *parent;
  };
  
  struct nfc_llcp_ui_cb {
  	__u8 dsap;
  	__u8 ssap;
  };
  
  #define nfc_llcp_ui_skb_cb(__skb) ((struct nfc_llcp_ui_cb *)&((__skb)->cb[0]))
  
  #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
  #define LLCP_AGF_PDU_HEADER_SIZE 2
  
  /* 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);
  void nfc_llcp_socket_remote_param_init(struct nfc_llcp_sock *sock);
  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);
  void nfc_llcp_send_to_raw_sock(struct nfc_llcp_local *local,
  			       struct sk_buff *skb, u8 direction);
  
  /* 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);
  struct nfc_llcp_sdp_tlv *nfc_llcp_build_sdres_tlv(u8 tid, u8 sap);
  struct nfc_llcp_sdp_tlv *nfc_llcp_build_sdreq_tlv(u8 tid, char *uri,
  						  size_t uri_len);
  void nfc_llcp_free_sdp_tlv(struct nfc_llcp_sdp_tlv *sdp);
  void nfc_llcp_free_sdp_tlv_list(struct hlist_head *sdp_head);
  void nfc_llcp_recv(void *data, struct sk_buff *skb, int err);
  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_snl_sdres(struct nfc_llcp_local *local,
  			    struct hlist_head *tlv_list, size_t tlvs_len);
  int nfc_llcp_send_snl_sdreq(struct nfc_llcp_local *local,
  			    struct hlist_head *tlv_list, size_t tlvs_len);
  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_ui_frame(struct nfc_llcp_sock *sock, u8 ssap, u8 dsap,
  			   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);