drivers/net/wireless/ath/dfs_pattern_detector.c

Source file repositories/reference/linux-study-clean/drivers/net/wireless/ath/dfs_pattern_detector.c

File Facts

System
Linux kernel
Corpus path
drivers/net/wireless/ath/dfs_pattern_detector.c
Extension
.c
Size
10994 bytes
Lines
373
Domain
Driver Families
Bucket
drivers/net
Inferred role
Driver Families: exported/initcall integration point
Status
integration implementation candidate

Why This File Exists

Repeatable hardware-adapter layer. Deep compatibility for every driver is out of scope; this atlas records patterns, probe lifecycles, bus glue, IRQ/DMA usage, and links back to core abstractions.

Dependency Surface

Detected Declarations

Annotated Snippet

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, 0, 4, 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, 3, 50, true),
	JP_PATTERN(5, 0, 1, 333, 333, 1, 9, 50, false),

Annotation

Implementation Notes