root/include/linux/mISDNdsp.h

#ifndef __mISDNdsp_H__
#define __mISDNdsp_H__

struct mISDN_dsp_element_arg {
        char    *name;
        char    *def;
        char    *desc;
};

struct mISDN_dsp_element {
        char    *name;
        void    *(*new)(const char *arg);
        void    (*free)(void *p);
        void    (*process_tx)(void *p, unsigned char *data, int len);
        void    (*process_rx)(void *p, unsigned char *data, int len);
        int     num_args;
        struct mISDN_dsp_element_arg
                *args;
};

extern int  mISDN_dsp_element_register(struct mISDN_dsp_element *elem);
extern void mISDN_dsp_element_unregister(struct mISDN_dsp_element *elem);

struct dsp_features {
        int     hfc_id; /* unique id to identify the chip (or -1) */
        int     hfc_dtmf; /* set if HFCmulti card supports dtmf */
        int     hfc_loops; /* set if card supports tone loops */
        int     hfc_echocanhw; /* set if card supports echocancelation*/
        int     pcm_id; /* unique id to identify the pcm bus (or -1) */
        int     pcm_slots; /* number of slots on the pcm bus */
        int     pcm_banks; /* number of IO banks of pcm bus */
        int     unclocked; /* data is not clocked (has jitter/loss) */
        int     unordered; /* data is unordered (packets have index) */
};

#endif