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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_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 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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