/* SPDX-License-Identifier: GPL-2.0 */
/*
 * see notice in l1oip.c
 */

/* debugging */
#define DEBUG_L1OIP_INIT        0x00010000
#define DEBUG_L1OIP_SOCKET      0x00020000
#define DEBUG_L1OIP_MGR         0x00040000
#define DEBUG_L1OIP_MSG         0x00080000

/* enable to disorder received bchannels by sequence 2143658798... */
/*
  #define REORDER_DEBUG
*/

/* frames */
#define L1OIP_MAX_LEN           2048            /* max packet size form l2 */
#define L1OIP_MAX_PERFRAME      1400            /* max data size in one frame */


/* timers */
#define L1OIP_KEEPALIVE         15
#define L1OIP_TIMEOUT           65


/* socket */
#define L1OIP_DEFAULTPORT       931


/* channel structure */
struct l1oip_chan {
        struct dchannel         *dch;
        struct bchannel         *bch;
        u32                     tx_counter;     /* counts xmit bytes/packets */
        u32                     rx_counter;     /* counts recv bytes/packets */
        u32                     codecstate;     /* used by codec to save data */
#ifdef REORDER_DEBUG
        int                     disorder_flag;
        struct sk_buff          *disorder_skb;
        u32                     disorder_cnt;
#endif
};


/* card structure */
struct l1oip {
        struct list_head        list;

        /* card */
        int                     registered;     /* if registered with mISDN */
        char                    name[MISDN_MAX_IDLEN];
        int                     idx;            /* card index */
        int                     pri;            /* 1=pri, 0=bri */
        int                     d_idx;          /* current dchannel number */
        int                     b_num;          /* number of bchannels */
        u32                     id;             /* id of connection */
        int                     ondemand;       /* if transmis. is on demand */
        int                     bundle;         /* bundle channels in one frm */
        int                     codec;          /* codec to use for transmis. */
        int                     limit;          /* limit number of bchannels */
        bool                    shutdown;       /* if card is released */

        /* timer */
        struct timer_list       keep_tl;
        struct timer_list       timeout_tl;
        int                     timeout_on;
        struct work_struct      workq;

        /* socket */
        struct socket           *socket;        /* if set, socket is created */
        struct completion       socket_complete;/* completion of sock thread */
        struct task_struct      *socket_thread;
        spinlock_t              socket_lock;    /* access sock outside thread */
        u32                     remoteip;       /* if all set, ip is assigned */
        u16                     localport;      /* must always be set */
        u16                     remoteport;     /* must always be set */
        struct sockaddr_in      sin_local;      /* local socket name */
        struct sockaddr_in      sin_remote;     /* remote socket name */
        struct msghdr           sendmsg;        /* ip message to send */
        struct kvec             sendiov;        /* iov for message */

        /* frame */
        struct l1oip_chan       chan[128];      /* channel instances */
};

extern int l1oip_law_to_4bit(u8 *data, int len, u8 *result, u32 *state);
extern int l1oip_4bit_to_law(u8 *data, int len, u8 *result);
extern int l1oip_alaw_to_ulaw(u8 *data, int len, u8 *result);
extern int l1oip_ulaw_to_alaw(u8 *data, int len, u8 *result);
extern void l1oip_4bit_free(void);
extern int l1oip_4bit_alloc(int ulaw);