/*
* 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_PATTERN_DETECTOR_H
#define DFS_PATTERN_DETECTOR_H
#include <linux/types.h>
#include <linux/list.h>
#include <linux/nl80211.h>
/* tolerated deviation of radar time stamp in usecs on both sides
* TODO : this might need to be HW - dependent
*/
#define PRI_TOLERANCE 16
/**
* struct ath_dfs_pool_stats - DFS Statistics for global pools
*/
struct ath_dfs_pool_stats {
u32 pool_reference;
u32 pulse_allocated;
u32 pulse_alloc_error;
u32 pulse_used;
u32 pseq_allocated;
u32 pseq_alloc_error;
u32 pseq_used;
};
/**
* struct pulse_event - describing pulses reported by PHY
* @ ts : pulse time stamp in us
* @ freq : channel frequency in MHz
* @ width : pulse duration in us
* @ rssi : rssi of radar event
* @ chirp : chirp detected in pulse
*/
struct pulse_event {
u64 ts;
u16 freq;
u8 width;
u8 rssi;
bool chirp;
};
/**
* struct radar_detector_specs - detector specs for a radar pattern type
* @ type_id : pattern type , as defined by regulatory
* @ width_min : minimum radar pulse width in [ us ]
* @ width_max : maximum radar pulse width in [ us ]
* @ pri_min : minimum pulse repetition interval in [ us ] ( including tolerance )
* @ pri_max : minimum pri in [ us ] ( including tolerance )
* @ num_pri : maximum number of different pri for this type
* @ ppb : pulses per bursts for this type
* @ ppb_thresh : number of pulses required to trigger detection
* @ max_pri_tolerance : pulse time stamp tolerance on both sides [ us ]
* @ chirp : chirp required for the radar pattern
*/
struct radar_detector_specs {
u8 type_id;
u8 width_min;
u8 width_max;
u16 pri_min;
u16 pri_max;
u8 num_pri;
u8 ppb;
u8 ppb_thresh;
u8 max_pri_tolerance;
bool chirp;
};
/**
* struct dfs_pattern_detector - DFS pattern detector
* @ exit ( ) : destructor
* @ set_dfs_domain ( ) : set DFS domain , resets detector lines upon domain changes
* @ add_pulse ( ) : add radar pulse to detector , returns true on detection
* @ region : active DFS region , NL80211_DFS_UNSET until set
* @ num_radar_types : number of different radar types
* @ last_pulse_ts : time stamp of last valid pulse in usecs
* @ radar_detector_specs : array of radar detection specs
* @ channel_detectors : list connecting channel_detector elements
*/
struct dfs_pattern_detector {
void (*exit )(struct dfs_pattern_detector *dpd);
bool (*set_dfs_domain)(struct dfs_pattern_detector *dpd,
enum nl80211_dfs_regions region);
bool (*add_pulse)(struct dfs_pattern_detector *dpd,
struct pulse_event *pe,
struct radar_detector_specs *rs);
struct ath_dfs_pool_stats (*get_stats)(struct dfs_pattern_detector *dpd);
enum nl80211_dfs_regions region;
u8 num_radar_types;
u64 last_pulse_ts;
/* needed for ath_dbg() */
struct ath_common *common;
const struct radar_detector_specs *radar_spec;
struct list_head channel_detectors;
};
/**
* dfs_pattern_detector_init ( ) - constructor for pattern detector class
* @ param region : DFS domain to be used , can be NL80211_DFS_UNSET at creation
* @ return instance pointer on success , NULL otherwise
*/
extern struct dfs_pattern_detector *
dfs_pattern_detector_init(struct ath_common *common,
enum nl80211_dfs_regions region);
#endif /* DFS_PATTERN_DETECTOR_H */
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