Thu, 07 Aug 2036 00:23:07 GMT
ETag: "2303ef96299d5bfe6eed3624a5c8e44a0630f943"

/*
 * 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.
 */

#include <linux/slab.h>
#include <linux/export.h>

#include "dfs_pattern_detector.h"
#include "dfs_pri_detector.h"
#include "ath.h"

/**
 * struct radar_types - contains array of patterns defined for one DFS domain
 * @domain: DFS regulatory domain
 * @num_radar_types: number of radar types to follow
 * @radar_types: radar types array
 */
struct radar_types {
	enum nl80211_dfs_regions region;
	u32 num_radar_types;
	const struct radar_detector_specs *radar_types;
};

/* percentage on ppb threshold to trigger detection */
#define MIN_PPB_THRESH	50
#define PPB_THRESH_RATE(PPB, RATE) ((PPB * RATE + 100 - RATE) / 100)
#define PPB_THRESH(PPB) PPB_THRESH_RATE(PPB, MIN_PPB_THRESH)
#define PRF2PRI(PRF) ((1000000 + PRF / 2) / PRF)
/* percentage of pulse width tolerance */
#define WIDTH_TOLERANCE 5
#define WIDTH_LOWER(X) ((X*(100-WIDTH_TOLERANCE)+50)/100)
#define WIDTH_UPPER(X) ((X*(100+WIDTH_TOLERANCE)+50)/100)

#define ETSI_PATTERN(ID, WMIN, WMAX, PMIN, PMAX, PRF, PPB, CHIRP)	\
{								\
	ID, WIDTH_LOWER(WMIN), WIDTH_UPPER(WMAX),		\
	(PRF2PRI(PMAX) - PRI_TOLERANCE),			\
	(PRF2PRI(PMIN) * PRF + PRI_TOLERANCE), PRF, PPB * PRF,	\
	PPB_THRESH(PPB), PRI_TOLERANCE,	CHIRP			\
}

/* radar types as defined by ETSI EN-301-893 v1.5.1 */
static const struct radar_detector_specs etsi_radar_ref_types_v15[] = {
	ETSI_PATTERN(0,  0,  1,  700,  700, 1, 18, false),
	ETSI_PATTERN(1,  0,  5,  200, 1000, 1, 10, false),
	ETSI_PATTERN(2,  0, 15,  200, 1600, 1, 15, false),
	ETSI_PATTERN(3,  0, 15, 2300, 4000, 1, 25, false),
	ETSI_PATTERN(4, 20, 30, 2000, 4000, 1, 20, false),
	ETSI_PATTERN(5,  0,  2,  300,  400, 3, 10, false),
	ETSI_PATTERN(6,  0,  2,  400, 1200, 3, 15, false),
};

static const struct radar_types etsi_radar_types_v15 = {
	.region			= NL80211_DFS_ETSI,
	.num_radar_types	= ARRAY_SIZE(etsi_radar_ref_types_v15),
	.radar_types		= etsi_radar_ref_types_v15,
};

#define FCC_PATTERN(ID, WMIN, WMAX, PMIN, PMAX, PRF, PPB, CHIRP)	\
{								\
	ID, WIDTH_LOWER(WMIN), WIDTH_UPPER(WMAX),		\
	PMIN - PRI_TOLERANCE,					\
	PMAX * PRF + PRI_TOLERANCE, PRF, PPB * PRF,		\
	PPB_THRESH(PPB), PRI_TOLERANCE,	CHIRP			\
}

/* radar types released on August 14, 2014
 * type 1 PRI values randomly selected within the range of 518 and 3066.
 * divide it to 3 groups is good enough for both of radar detection and
 * avoiding false detection based on practical test results
 * collected for more than a year.
 */
static const struct radar_detector_specs fcc_radar_ref_types[] = {
	FCC_PATTERN(0, 0, 1, 1428, 1428, 1, 18, false),
	FCC_PATTERN(101, 0, 1, 518, 938, 1, 57, false),
	FCC_PATTERN(102, 0, 1, 938, 2000, 1, 27, false),
	FCC_PATTERN(103, 0, 1, 2000, 3066, 1, 18, false),
	FCC_PATTERN(2, 0, 5, 150, 230, 1, 23, false),
	FCC_PATTERN(3, 6, 10, 200, 500, 1, 16, false),
	FCC_PATTERN(4, 11, 20, 200, 500, 1, 12, false),
	FCC_PATTERN(5, 50, 100, 1000, 2000, 1, 1, true),
	FCC_