44acedb00b
PRI value is used as divider when DFS detector analyzes candidate radar pulses. If PRI deviation is big from its origin PRI, DFS detector could miss valid radar reports since HW often misses detecting radar pulses and causes long interval value of pulses. For instance from practical results, if runtime PRI is calculated as 1431 for fixed PRI value of 1428 and delta timestamp logs 15719, the modular remainder will be 1409 and the delta between the remainder and runtime PRI is 22 that is bigger than PRI tolerance which is 16. As a result this radar report will be ignored even though it's valid. By using spec defined PRI for fixed PRI, we can correct this error. Signed-off-by: Peter Oh <poh@qca.qualcomm.com> Signed-off-by: Kalle Valo <kvalo@qca.qualcomm.com>
122 lines
3.8 KiB
C
122 lines
3.8 KiB
C
/*
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* Copyright (c) 2012 Neratec Solutions AG
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*
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* Permission to use, copy, modify, and/or distribute this software for any
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* purpose with or without fee is hereby granted, provided that the above
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* copyright notice and this permission notice appear in all copies.
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*
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* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
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* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
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* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
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* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
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* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
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* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
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* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
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*/
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#ifndef DFS_PATTERN_DETECTOR_H
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#define DFS_PATTERN_DETECTOR_H
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#include <linux/types.h>
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#include <linux/list.h>
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#include <linux/nl80211.h>
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/* tolerated deviation of radar time stamp in usecs on both sides
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* TODO: this might need to be HW-dependent
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*/
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#define PRI_TOLERANCE 16
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/**
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* struct ath_dfs_pool_stats - DFS Statistics for global pools
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*/
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struct ath_dfs_pool_stats {
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u32 pool_reference;
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u32 pulse_allocated;
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u32 pulse_alloc_error;
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u32 pulse_used;
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u32 pseq_allocated;
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u32 pseq_alloc_error;
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u32 pseq_used;
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};
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/**
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* struct pulse_event - describing pulses reported by PHY
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* @ts: pulse time stamp in us
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* @freq: channel frequency in MHz
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* @width: pulse duration in us
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* @rssi: rssi of radar event
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* @chirp: chirp detected in pulse
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*/
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struct pulse_event {
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u64 ts;
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u16 freq;
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u8 width;
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u8 rssi;
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bool chirp;
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};
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/**
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* struct radar_detector_specs - detector specs for a radar pattern type
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* @type_id: pattern type, as defined by regulatory
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* @width_min: minimum radar pulse width in [us]
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* @width_max: maximum radar pulse width in [us]
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* @pri_min: minimum pulse repetition interval in [us] (including tolerance)
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* @pri_max: minimum pri in [us] (including tolerance)
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* @num_pri: maximum number of different pri for this type
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* @ppb: pulses per bursts for this type
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* @ppb_thresh: number of pulses required to trigger detection
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* @max_pri_tolerance: pulse time stamp tolerance on both sides [us]
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* @chirp: chirp required for the radar pattern
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*/
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struct radar_detector_specs {
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u8 type_id;
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u8 width_min;
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u8 width_max;
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u16 pri_min;
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u16 pri_max;
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u8 num_pri;
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u8 ppb;
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u8 ppb_thresh;
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u8 max_pri_tolerance;
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bool chirp;
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};
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/**
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* struct dfs_pattern_detector - DFS pattern detector
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* @exit(): destructor
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* @set_dfs_domain(): set DFS domain, resets detector lines upon domain changes
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* @add_pulse(): add radar pulse to detector, returns true on detection
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* @region: active DFS region, NL80211_DFS_UNSET until set
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* @num_radar_types: number of different radar types
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* @last_pulse_ts: time stamp of last valid pulse in usecs
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* @radar_detector_specs: array of radar detection specs
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* @channel_detectors: list connecting channel_detector elements
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*/
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struct dfs_pattern_detector {
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void (*exit)(struct dfs_pattern_detector *dpd);
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bool (*set_dfs_domain)(struct dfs_pattern_detector *dpd,
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enum nl80211_dfs_regions region);
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bool (*add_pulse)(struct dfs_pattern_detector *dpd,
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struct pulse_event *pe);
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struct ath_dfs_pool_stats (*get_stats)(struct dfs_pattern_detector *dpd);
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enum nl80211_dfs_regions region;
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u8 num_radar_types;
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u64 last_pulse_ts;
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/* needed for ath_dbg() */
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struct ath_common *common;
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const struct radar_detector_specs *radar_spec;
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struct list_head channel_detectors;
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};
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/**
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* dfs_pattern_detector_init() - constructor for pattern detector class
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* @param region: DFS domain to be used, can be NL80211_DFS_UNSET at creation
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* @return instance pointer on success, NULL otherwise
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*/
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extern struct dfs_pattern_detector *
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dfs_pattern_detector_init(struct ath_common *common,
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enum nl80211_dfs_regions region);
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#endif /* DFS_PATTERN_DETECTOR_H */
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