[deliverable/linux.git] / drivers / net / wireless / ath / dfs_pattern_detector.c

/*
 * 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"

/*
 * tolerated deviation of radar time stamp in usecs on both sides
 * TODO: this might need to be HW-dependent
 */
#define PRI_TOLERANCE	16

/**
 * 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_PATTERN(6, 0, 1, 333, 333, 1, 9, false),
};

static const struct radar_types fcc_radar_types = {
	.region			= NL80211_DFS_FCC,
	.num_radar_types	= ARRAY_SIZE(fcc_radar_ref_types),
	.radar_types		= fcc_radar_ref_types,
};

#define JP_PATTERN(ID, WMIN, WMAX, PMIN, PMAX, PRF, PPB, RATE, CHIRP)	\
{								\
	ID, WIDTH_LOWER(WMIN), WIDTH_UPPER(WMAX),		\
	PMIN - PRI_TOLERANCE,					\
	PMAX * PRF + PRI_TOLERANCE, PRF, PPB * PRF,		\
	PPB_THRESH_RATE(PPB, RATE), PRI_TOLERANCE, CHIRP	\
}
static const struct radar_detector_specs jp_radar_ref_types[] = {
	JP_PATTERN(0, 0, 1, 1428, 1428, 1, 18, 29, false),
	JP_PATTERN(1, 2, 3, 3846, 3846, 1, 18, 29, false),
	JP_PATTERN(2, 0, 1, 1388, 1388, 1, 18, 50, false),
	JP_PATTERN(3, 1, 2, 4000, 4000, 1, 18, 50, false),
	JP_PATTERN(4, 0, 5, 150, 230, 1, 23, 50, false),
	JP_PATTERN(5, 6, 10, 200, 500, 1, 16, 50, false),
	JP_PATTERN(6, 11, 20, 200, 500, 1, 12, 50, false),
	JP_PATTERN(7, 50, 100, 1000, 2000, 1, 20, 50, false),
	JP_PATTERN(5, 0, 1, 333, 333, 1, 9, 50, false),
};

static const struct radar_types jp_radar_types = {
	.region			= NL80211_DFS_JP,
	.num_radar_types	= ARRAY_SIZE(jp_radar_ref_types),
	.radar_types		= jp_radar_ref_types,
};

static const struct radar_types *dfs_domains[] = {
	&etsi_radar_types_v15,
	&fcc_radar_types,
	&jp_radar_types,
};

/**
 * get_dfs_domain_radar_types() - get radar types for a given DFS domain
 * @param domain DFS domain
 * @return radar_types ptr on success, NULL if DFS domain is not supported
 */
static const struct radar_types *
get_dfs_domain_radar_types(enum nl80211_dfs_regions region)
{
	u32 i;
	for (i = 0; i < ARRAY_SIZE(dfs_domains); i++) {
		if (dfs_domains[i]->region == region)
			return dfs_domains[i];
	}
	return NULL;
}

/**
 * struct channel_detector - detector elements for a DFS channel
 * @head: list_head
 * @freq: frequency for this channel detector in MHz
 * @detectors: array of dynamically created detector elements for this freq
 *
 * Channel detectors are required to provide multi-channel DFS detection, e.g.
 * to support off-channel scanning. A pattern detector has a list of channels
 * radar pulses have been reported for in the past.
 */
struct channel_detector {
	struct list_head head;
	u16 freq;
	struct pri_detector **detectors;
};

/* channel_detector_reset() - reset detector lines for a given channel */
static void channel_detector_reset(struct dfs_pattern_detector *dpd,
				   struct channel_detector *cd)
{
	u32 i;
	if (cd == NULL)
		return;
	for (i = 0; i < dpd->num_radar_types; i++)
		cd->detectors[i]->reset(cd->detectors[i], dpd->last_pulse_ts);
}

/* channel_detector_exit() - destructor */
static void channel_detector_exit(struct dfs_pattern_detector *dpd,
				  struct channel_detector *cd)
{
	u32 i;
	if (cd == NULL)
		return;
	list_del(&cd->head);
	for (i = 0; i < dpd->num_radar_types; i++) {
		struct pri_detector *de = cd->detectors[i];
		if (de != NULL)
			de->exit(de);
	}
	kfree(cd->detectors);
	kfree(cd);
}

static struct channel_detector *
channel_detector_create(struct dfs_pattern_detector *dpd, u16 freq)
{
	u32 sz, i;
	struct channel_detector *cd;

	cd = kmalloc(sizeof(*cd), GFP_ATOMIC);
	if (cd == NULL)
		goto fail;

	INIT_LIST_HEAD(&cd->head);
	cd->freq = freq;
	sz = sizeof(cd->detectors) * dpd->num_radar_types;
	cd->detectors = kzalloc(sz, GFP_ATOMIC);
	if (cd->detectors == NULL)
		goto fail;

	for (i = 0; i < dpd->num_radar_types; i++) {
		const struct radar_detector_specs *rs = &dpd->radar_spec[i];
		struct pri_detector *de = pri_detector_init(rs);
		if (de == NULL)
			goto fail;
		cd->detectors[i] = de;
	}
	list_add(&cd->head, &dpd->channel_detectors);
	return cd;

fail:
	ath_dbg(dpd->common, DFS,
		"failed to allocate channel_detector for freq=%d\n", freq);
	channel_detector_exit(dpd, cd);
	return NULL;
}

/**
 * channel_detector_get() - get channel detector for given frequency
 * @param dpd instance pointer
 * @param freq frequency in MHz
 * @return pointer to channel detector on success, NULL otherwise
 *
 * Return existing channel detector for the given frequency or return a
 * newly create one.
 */
static struct channel_detector *
channel_detector_get(struct dfs_pattern_detector *dpd, u16 freq)
{
	struct channel_detector *cd;
	list_for_each_entry(cd, &dpd->channel_detectors, head) {
		if (cd->freq == freq)
			return cd;
	}
	return channel_detector_create(dpd, freq);
}

/*
 * DFS Pattern Detector
 */

/* dpd_reset(): reset all channel detectors */
static void dpd_reset(struct dfs_pattern_detector *dpd)
{
	struct channel_detector *cd;
	if (!list_empty(&dpd->channel_detectors))
		list_for_each_entry(cd, &dpd->channel_detectors, head)
			channel_detector_reset(dpd, cd);

}
static void dpd_exit(struct dfs_pattern_detector *dpd)
{
	struct channel_detector *cd, *cd0;
	if (!list_empty(&dpd->channel_detectors))
		list_for_each_entry_safe(cd, cd0, &dpd->channel_detectors, head)
			channel_detector_exit(dpd, cd);
	kfree(dpd);
}

static bool
dpd_add_pulse(struct dfs_pattern_detector *dpd, struct pulse_event *event)
{
	u32 i;
	struct channel_detector *cd;

	/*
	 * pulses received for a non-supported or un-initialized
	 * domain are treated as detected radars for fail-safety
	 */
	if (dpd->region == NL80211_DFS_UNSET)
		return true;

	cd = channel_detector_get(dpd, event->freq);
	if (cd == NULL)
		return false;

	dpd->last_pulse_ts = event->ts;
	/* reset detector on time stamp wraparound, caused by TSF reset */
	if (event->ts < dpd->last_pulse_ts)
		dpd_reset(dpd);

	/* do type individual pattern matching */
	for (i = 0; i < dpd->num_radar_types; i++) {
		struct pri_detector *pd = cd->detectors[i];
		struct pri_sequence *ps = pd->add_pulse(pd, event);
		if (ps != NULL) {
			ath_dbg(dpd->common, DFS,
				"DFS: radar found on freq=%d: id=%d, pri=%d, "
				"count=%d, count_false=%d\n",
				event->freq, pd->rs->type_id,
				ps->pri, ps->count, ps->count_falses);
			pd->reset(pd, dpd->last_pulse_ts);
			return true;
		}
	}
	return false;
}

static struct ath_dfs_pool_stats
dpd_get_stats(struct dfs_pattern_detector *dpd)
{
	return global_dfs_pool_stats;
}

static bool dpd_set_domain(struct dfs_pattern_detector *dpd,
			   enum nl80211_dfs_regions region)
{
	const struct radar_types *rt;
	struct channel_detector *cd, *cd0;

	if (dpd->region == region)
		return true;

	dpd->region = NL80211_DFS_UNSET;

	rt = get_dfs_domain_radar_types(region);
	if (rt == NULL)
		return false;

	/* delete all channel detectors for previous DFS domain */
	if (!list_empty(&dpd->channel_detectors))
		list_for_each_entry_safe(cd, cd0, &dpd->channel_detectors, head)
			channel_detector_exit(dpd, cd);
	dpd->radar_spec = rt->radar_types;
	dpd->num_radar_types = rt->num_radar_types;

	dpd->region = region;
	return true;
}

static struct dfs_pattern_detector default_dpd = {
	.exit		= dpd_exit,
	.set_dfs_domain	= dpd_set_domain,
	.add_pulse	= dpd_add_pulse,
	.get_stats	= dpd_get_stats,
	.region		= NL80211_DFS_UNSET,
};

struct dfs_pattern_detector *
dfs_pattern_detector_init(struct ath_common *common,
			  enum nl80211_dfs_regions region)
{
	struct dfs_pattern_detector *dpd;

	if (!config_enabled(CONFIG_CFG80211_CERTIFICATION_ONUS))
		return NULL;

	dpd = kmalloc(sizeof(*dpd), GFP_KERNEL);
	if (dpd == NULL)
		return NULL;

	*dpd = default_dpd;
	INIT_LIST_HEAD(&dpd->channel_detectors);

	dpd->common = common;
	if (dpd->set_dfs_domain(dpd, region))
		return dpd;

	ath_dbg(common, DFS,"Could not set DFS domain to %d", region);
	kfree(dpd);
	return NULL;
}
EXPORT_SYMBOL(dfs_pattern_detector_init);
Commit	Line	Data
6ee159e2 ZK	1	/*
	2	* Copyright (c) 2012 Neratec Solutions AG
	3	*
	4	* Permission to use, copy, modify, and/or distribute this software for any
	5	* purpose with or without fee is hereby granted, provided that the above
	6	* copyright notice and this permission notice appear in all copies.
	7	*
	8	* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
	9	* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
	10	* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
	11	* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
	12	* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
	13	* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
	14	* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
	15	*/
	16
	17	#include <linux/slab.h>
	18	#include <linux/export.h>
	19
	20	#include "dfs_pattern_detector.h"
	21	#include "dfs_pri_detector.h"
ad40d3da	22	#include "ath.h"
6ee159e2 ZK	23
	24	/*
	25	* tolerated deviation of radar time stamp in usecs on both sides
	26	* TODO: this might need to be HW-dependent
	27	*/
	28	#define PRI_TOLERANCE 16
	29
	30	/**
	31	* struct radar_types - contains array of patterns defined for one DFS domain
	32	* @domain: DFS regulatory domain
	33	* @num_radar_types: number of radar types to follow
	34	* @radar_types: radar types array
	35	*/
	36	struct radar_types {
	37	enum nl80211_dfs_regions region;
	38	u32 num_radar_types;
	39	const struct radar_detector_specs *radar_types;
	40	};
	41
	42	/* percentage on ppb threshold to trigger detection */
	43	#define MIN_PPB_THRESH 50
cb3fbd63 PO	44	#define PPB_THRESH_RATE(PPB, RATE) ((PPB * RATE + 100 - RATE) / 100)
cb3fbd63 PO	45	#define PPB_THRESH(PPB) PPB_THRESH_RATE(PPB, MIN_PPB_THRESH)
6ee159e2	46	#define PRF2PRI(PRF) ((1000000 + PRF / 2) / PRF)
a6952287 ZK	47	/* percentage of pulse width tolerance */
	48	#define WIDTH_TOLERANCE 5
	49	#define WIDTH_LOWER(X) ((X*(100-WIDTH_TOLERANCE)+50)/100)
	50	#define WIDTH_UPPER(X) ((X*(100+WIDTH_TOLERANCE)+50)/100)
6ee159e2	51
beb28edf	52	#define ETSI_PATTERN(ID, WMIN, WMAX, PMIN, PMAX, PRF, PPB, CHIRP) \
6ee159e2	53	{ \
a6952287 ZK	54	ID, WIDTH_LOWER(WMIN), WIDTH_UPPER(WMAX), \
a6952287 ZK	55	(PRF2PRI(PMAX) - PRI_TOLERANCE), \
6ee159e2	56	(PRF2PRI(PMIN) * PRF + PRI_TOLERANCE), PRF, PPB * PRF, \
beb28edf	57	PPB_THRESH(PPB), PRI_TOLERANCE, CHIRP \
6ee159e2 ZK	58	}
	59
	60	/* radar types as defined by ETSI EN-301-893 v1.5.1 */
	61	static const struct radar_detector_specs etsi_radar_ref_types_v15[] = {
beb28edf PO	62	ETSI_PATTERN(0, 0, 1, 700, 700, 1, 18, false),
	63	ETSI_PATTERN(1, 0, 5, 200, 1000, 1, 10, false),
	64	ETSI_PATTERN(2, 0, 15, 200, 1600, 1, 15, false),
	65	ETSI_PATTERN(3, 0, 15, 2300, 4000, 1, 25, false),
	66	ETSI_PATTERN(4, 20, 30, 2000, 4000, 1, 20, false),
	67	ETSI_PATTERN(5, 0, 2, 300, 400, 3, 10, false),
	68	ETSI_PATTERN(6, 0, 2, 400, 1200, 3, 15, false),
6ee159e2 ZK	69	};
	70
	71	static const struct radar_types etsi_radar_types_v15 = {
	72	.region = NL80211_DFS_ETSI,
	73	.num_radar_types = ARRAY_SIZE(etsi_radar_ref_types_v15),
	74	.radar_types = etsi_radar_ref_types_v15,
	75	};
	76
beb28edf	77	#define FCC_PATTERN(ID, WMIN, WMAX, PMIN, PMAX, PRF, PPB, CHIRP) \
f12e3e03 JD	78	{ \
	79	ID, WIDTH_LOWER(WMIN), WIDTH_UPPER(WMAX), \
	80	PMIN - PRI_TOLERANCE, \
	81	PMAX * PRF + PRI_TOLERANCE, PRF, PPB * PRF, \
beb28edf	82	PPB_THRESH(PPB), PRI_TOLERANCE, CHIRP \
f12e3e03 JD	83	}
f12e3e03 JD	84
694c0e0a PO	85	/* radar types released on August 14, 2014
	86	* type 1 PRI values randomly selected within the range of 518 and 3066.
	87	* divide it to 3 groups is good enough for both of radar detection and
	88	* avoiding false detection based on practical test results
	89	* collected for more than a year.
	90	*/
f12e3e03	91	static const struct radar_detector_specs fcc_radar_ref_types[] = {
beb28edf	92	FCC_PATTERN(0, 0, 1, 1428, 1428, 1, 18, false),
694c0e0a PO	93	FCC_PATTERN(101, 0, 1, 518, 938, 1, 57, false),
	94	FCC_PATTERN(102, 0, 1, 938, 2000, 1, 27, false),
	95	FCC_PATTERN(103, 0, 1, 2000, 3066, 1, 18, false),
	96	FCC_PATTERN(2, 0, 5, 150, 230, 1, 23, false),
	97	FCC_PATTERN(3, 6, 10, 200, 500, 1, 16, false),
	98	FCC_PATTERN(4, 11, 20, 200, 500, 1, 12, false),
	99	FCC_PATTERN(5, 50, 100, 1000, 2000, 1, 1, true),
	100	FCC_PATTERN(6, 0, 1, 333, 333, 1, 9, false),
f12e3e03 JD	101	};
	102
	103	static const struct radar_types fcc_radar_types = {
	104	.region = NL80211_DFS_FCC,
	105	.num_radar_types = ARRAY_SIZE(fcc_radar_ref_types),
	106	.radar_types = fcc_radar_ref_types,
	107	};
	108
cb3fbd63 PO	109	#define JP_PATTERN(ID, WMIN, WMAX, PMIN, PMAX, PRF, PPB, RATE, CHIRP) \
	110	{ \
	111	ID, WIDTH_LOWER(WMIN), WIDTH_UPPER(WMAX), \
	112	PMIN - PRI_TOLERANCE, \
	113	PMAX * PRF + PRI_TOLERANCE, PRF, PPB * PRF, \
	114	PPB_THRESH_RATE(PPB, RATE), PRI_TOLERANCE, CHIRP \
	115	}
89ce4f65	116	static const struct radar_detector_specs jp_radar_ref_types[] = {
26bea13a PO	117	JP_PATTERN(0, 0, 1, 1428, 1428, 1, 18, 29, false),
26bea13a PO	118	JP_PATTERN(1, 2, 3, 3846, 3846, 1, 18, 29, false),
cb3fbd63 PO	119	JP_PATTERN(2, 0, 1, 1388, 1388, 1, 18, 50, false),
	120	JP_PATTERN(3, 1, 2, 4000, 4000, 1, 18, 50, false),
	121	JP_PATTERN(4, 0, 5, 150, 230, 1, 23, 50, false),
	122	JP_PATTERN(5, 6, 10, 200, 500, 1, 16, 50, false),
	123	JP_PATTERN(6, 11, 20, 200, 500, 1, 12, 50, false),
	124	JP_PATTERN(7, 50, 100, 1000, 2000, 1, 20, 50, false),
	125	JP_PATTERN(5, 0, 1, 333, 333, 1, 9, 50, false),
89ce4f65 JD	126	};
	127
	128	static const struct radar_types jp_radar_types = {
	129	.region = NL80211_DFS_JP,
	130	.num_radar_types = ARRAY_SIZE(jp_radar_ref_types),
	131	.radar_types = jp_radar_ref_types,
	132	};
	133
6ee159e2 ZK	134	static const struct radar_types *dfs_domains[] = {
6ee159e2 ZK	135	&etsi_radar_types_v15,
f12e3e03	136	&fcc_radar_types,
89ce4f65	137	&jp_radar_types,
6ee159e2 ZK	138	};
	139
	140	/**
	141	* get_dfs_domain_radar_types() - get radar types for a given DFS domain
	142	* @param domain DFS domain
	143	* @return radar_types ptr on success, NULL if DFS domain is not supported
	144	*/
	145	static const struct radar_types *
	146	get_dfs_domain_radar_types(enum nl80211_dfs_regions region)
	147	{
	148	u32 i;
	149	for (i = 0; i < ARRAY_SIZE(dfs_domains); i++) {
	150	if (dfs_domains[i]->region == region)
	151	return dfs_domains[i];
	152	}
	153	return NULL;
	154	}
	155
	156	/**
	157	* struct channel_detector - detector elements for a DFS channel
	158	* @head: list_head
	159	* @freq: frequency for this channel detector in MHz
	160	* @detectors: array of dynamically created detector elements for this freq
	161	*
	162	* Channel detectors are required to provide multi-channel DFS detection, e.g.
	163	* to support off-channel scanning. A pattern detector has a list of channels
	164	* radar pulses have been reported for in the past.
	165	*/
	166	struct channel_detector {
	167	struct list_head head;
	168	u16 freq;
	169	struct pri_detector **detectors;
	170	};
	171
	172	/* channel_detector_reset() - reset detector lines for a given channel */
	173	static void channel_detector_reset(struct dfs_pattern_detector *dpd,
	174	struct channel_detector *cd)
	175	{
	176	u32 i;
	177	if (cd == NULL)
	178	return;
	179	for (i = 0; i < dpd->num_radar_types; i++)
	180	cd->detectors[i]->reset(cd->detectors[i], dpd->last_pulse_ts);
	181	}
	182
	183	/* channel_detector_exit() - destructor */
	184	static void channel_detector_exit(struct dfs_pattern_detector *dpd,
	185	struct channel_detector *cd)
	186	{
	187	u32 i;
	188	if (cd == NULL)
	189	return;
	190	list_del(&cd->head);
	191	for (i = 0; i < dpd->num_radar_types; i++) {
	192	struct pri_detector *de = cd->detectors[i];
	193	if (de != NULL)
	194	de->exit(de);
	195	}
	196	kfree(cd->detectors);
	197	kfree(cd);
	198	}
	199
	200	static struct channel_detector *
	201	channel_detector_create(struct dfs_pattern_detector *dpd, u16 freq)
202	{
203	u32 sz, i;
204	struct channel_detector *cd;
205
5d8cd3b1	206	cd = kmalloc(sizeof(*cd), GFP_ATOMIC);
6ee159e2 ZK	207	if (cd == NULL)
	208	goto fail;
	209
	210	INIT_LIST_HEAD(&cd->head);
	211	cd->freq = freq;
	212	sz = sizeof(cd->detectors) * dpd->num_radar_types;
5d8cd3b1	213	cd->detectors = kzalloc(sz, GFP_ATOMIC);
6ee159e2 ZK	214	if (cd->detectors == NULL)
	215	goto fail;
	216
	217	for (i = 0; i < dpd->num_radar_types; i++) {
	218	const struct radar_detector_specs *rs = &dpd->radar_spec[i];
	219	struct pri_detector *de = pri_detector_init(rs);
	220	if (de == NULL)
	221	goto fail;
	222	cd->detectors[i] = de;
	223	}
	224	list_add(&cd->head, &dpd->channel_detectors);
	225	return cd;
	226
	227	fail:
95a5992e	228	ath_dbg(dpd->common, DFS,
ca21cfde	229	"failed to allocate channel_detector for freq=%d\n", freq);
6ee159e2 ZK	230	channel_detector_exit(dpd, cd);
	231	return NULL;
	232	}
	233
	234	/**
	235	* channel_detector_get() - get channel detector for given frequency
	236	* @param dpd instance pointer
	237	* @param freq frequency in MHz
	238	* @return pointer to channel detector on success, NULL otherwise
	239	*
	240	* Return existing channel detector for the given frequency or return a
	241	* newly create one.
	242	*/
	243	static struct channel_detector *
	244	channel_detector_get(struct dfs_pattern_detector *dpd, u16 freq)
	245	{
	246	struct channel_detector *cd;
	247	list_for_each_entry(cd, &dpd->channel_detectors, head) {
	248	if (cd->freq == freq)
	249	return cd;
	250	}
	251	return channel_detector_create(dpd, freq);
	252	}
	253
	254	/*
	255	* DFS Pattern Detector
	256	*/
	257
	258	/* dpd_reset(): reset all channel detectors */
	259	static void dpd_reset(struct dfs_pattern_detector *dpd)
	260	{
	261	struct channel_detector *cd;
	262	if (!list_empty(&dpd->channel_detectors))
	263	list_for_each_entry(cd, &dpd->channel_detectors, head)
	264	channel_detector_reset(dpd, cd);
	265
	266	}
	267	static void dpd_exit(struct dfs_pattern_detector *dpd)
	268	{
	269	struct channel_detector cd, cd0;
	270	if (!list_empty(&dpd->channel_detectors))
	271	list_for_each_entry_safe(cd, cd0, &dpd->channel_detectors, head)
	272	channel_detector_exit(dpd, cd);
	273	kfree(dpd);
	274	}
	275
	276	static bool
	277	dpd_add_pulse(struct dfs_pattern_detector dpd, struct pulse_event event)
	278	{
	279	u32 i;
6ee159e2 ZK	280	struct channel_detector *cd;
6ee159e2 ZK	281
ca21cfde ZK	282	/*
	283	* pulses received for a non-supported or un-initialized
	284	* domain are treated as detected radars for fail-safety
	285	*/
	286	if (dpd->region == NL80211_DFS_UNSET)
6ee159e2	287	return true;
6ee159e2 ZK	288
	289	cd = channel_detector_get(dpd, event->freq);
	290	if (cd == NULL)
	291	return false;
	292
6ee159e2	293	dpd->last_pulse_ts = event->ts;
ca21cfde ZK	294	/* reset detector on time stamp wraparound, caused by TSF reset */
ca21cfde ZK	295	if (event->ts < dpd->last_pulse_ts)
6ee159e2	296	dpd_reset(dpd);
ca21cfde	297
6ee159e2 ZK	298	/* do type individual pattern matching */
6ee159e2 ZK	299	for (i = 0; i < dpd->num_radar_types; i++) {
ca21cfde ZK	300	struct pri_detector *pd = cd->detectors[i];
	301	struct pri_sequence *ps = pd->add_pulse(pd, event);
	302	if (ps != NULL) {
95a5992e	303	ath_dbg(dpd->common, DFS,
ca21cfde ZK	304	"DFS: radar found on freq=%d: id=%d, pri=%d, "
	305	"count=%d, count_false=%d\n",
	306	event->freq, pd->rs->type_id,
	307	ps->pri, ps->count, ps->count_falses);
8252a35a	308	pd->reset(pd, dpd->last_pulse_ts);
6ee159e2 ZK	309	return true;
	310	}
	311	}
	312	return false;
	313	}
	314
d265214b JD	315	static struct ath_dfs_pool_stats
	316	dpd_get_stats(struct dfs_pattern_detector *dpd)
	317	{
	318	return global_dfs_pool_stats;
	319	}
	320
6ee159e2 ZK	321	static bool dpd_set_domain(struct dfs_pattern_detector *dpd,
	322	enum nl80211_dfs_regions region)
	323	{
	324	const struct radar_types *rt;
	325	struct channel_detector cd, cd0;
	326
	327	if (dpd->region == region)
	328	return true;
	329
	330	dpd->region = NL80211_DFS_UNSET;
	331
	332	rt = get_dfs_domain_radar_types(region);
	333	if (rt == NULL)
	334	return false;
	335
	336	/* delete all channel detectors for previous DFS domain */
	337	if (!list_empty(&dpd->channel_detectors))
	338	list_for_each_entry_safe(cd, cd0, &dpd->channel_detectors, head)
	339	channel_detector_exit(dpd, cd);
	340	dpd->radar_spec = rt->radar_types;
	341	dpd->num_radar_types = rt->num_radar_types;
	342
	343	dpd->region = region;
	344	return true;
	345	}
	346
	347	static struct dfs_pattern_detector default_dpd = {
	348	.exit = dpd_exit,
259bcf87	349	.set_dfs_domain = dpd_set_domain,
6ee159e2	350	.add_pulse = dpd_add_pulse,
d265214b	351	.get_stats = dpd_get_stats,
6ee159e2 ZK	352	.region = NL80211_DFS_UNSET,
	353	};
	354
	355	struct dfs_pattern_detector *
95a5992e JD	356	dfs_pattern_detector_init(struct ath_common *common,
95a5992e JD	357	enum nl80211_dfs_regions region)
6ee159e2 ZK	358	{
6ee159e2 ZK	359	struct dfs_pattern_detector *dpd;
0d2e7a5c	360
379ce86e JD	361	if (!config_enabled(CONFIG_CFG80211_CERTIFICATION_ONUS))
	362	return NULL;
	363
6ee159e2	364	dpd = kmalloc(sizeof(*dpd), GFP_KERNEL);
0d2e7a5c	365	if (dpd == NULL)
6ee159e2	366	return NULL;
0d2e7a5c	367
6ee159e2 ZK	368	*dpd = default_dpd;
	369	INIT_LIST_HEAD(&dpd->channel_detectors);
	370
95a5992e	371	dpd->common = common;
259bcf87	372	if (dpd->set_dfs_domain(dpd, region))
6ee159e2 ZK	373	return dpd;
6ee159e2 ZK	374
ca21cfde	375	ath_dbg(common, DFS,"Could not set DFS domain to %d", region);
70bf870b	376	kfree(dpd);
6ee159e2 ZK	377	return NULL;
	378	}
	379	EXPORT_SYMBOL(dfs_pattern_detector_init);