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/*
* Copyright (c) 2012 Neratec Solutions AG
*
* Permission to use, copy, modify, and/or distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice appear in all copies.
*
* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*/
#ifndef DFS_PRI_DETECTOR_H
#define DFS_PRI_DETECTOR_H
#include <linux/list.h>
/**
* struct pri_sequence - sequence of pulses matching one PRI
* @head: list_head
* @pri: pulse repetition interval (PRI) in usecs
* @dur: duration of sequence in usecs
* @count: number of pulses in this sequence
* @count_falses: number of not matching pulses in this sequence
* @first_ts: time stamp of first pulse in usecs
* @last_ts: time stamp of last pulse in usecs
* @deadline_ts: deadline when this sequence becomes invalid (first_ts + dur)
*/
struct pri_sequence {
struct list_head head;
u32 pri;
u32 dur;
u32 count;
u32 count_falses;
u64 first_ts;
u64 last_ts;
u64 deadline_ts;
};
/**
* struct pri_detector - PRI detector element for a dedicated radar type
* @exit(): destructor
* @add_pulse(): add pulse event, returns pri_sequence if pattern was detected
* @reset(): clear states and reset to given time stamp
* @rs: detector specs for this detector element
* @last_ts: last pulse time stamp considered for this element in usecs
* @sequences: list_head holding potential pulse sequences
* @pulses: list connecting pulse_elem objects
* @count: number of pulses in queue
* @max_count: maximum number of pulses to be queued
* @window_size: window size back from newest pulse time stamp in usecs
*/
struct pri_detector {
void (*exit) (struct pri_detector *de);
struct pri_sequence *
(*add_pulse)(struct pri_detector *de, struct pulse_event *e);
void (*reset) (struct pri_detector *de, u64 ts);
/* private: internal use only */
const struct radar_detector_specs *rs;
u64 last_ts;
struct list_head sequences;
struct list_head pulses;
u32 count;
u32 max_count;
u32 window_size;
};
struct pri_detector *pri_detector_init(const struct radar_detector_specs *rs);
#endif /* DFS_PRI_DETECTOR_H */
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