summaryrefslogtreecommitdiffstats
path: root/drivers/net/wireless/ath/ath9k/common-spectral.h
blob: 998743be9c6724de510d1dc33d62eb67df32577d (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
/*
 * Copyright (c) 2013 Qualcomm Atheros, Inc.
 *
 * 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 SPECTRAL_H
#define SPECTRAL_H

#include "../spectral_common.h"

/* enum spectral_mode:
 *
 * @SPECTRAL_DISABLED: spectral mode is disabled
 * @SPECTRAL_BACKGROUND: hardware sends samples when it is not busy with
 *	something else.
 * @SPECTRAL_MANUAL: spectral scan is enabled, triggering for samples
 *	is performed manually.
 * @SPECTRAL_CHANSCAN: Like manual, but also triggered when changing channels
 *	during a channel scan.
 */
enum spectral_mode {
	SPECTRAL_DISABLED = 0,
	SPECTRAL_BACKGROUND,
	SPECTRAL_MANUAL,
	SPECTRAL_CHANSCAN,
};

#define SPECTRAL_SCAN_BITMASK		0x10
/* Radar info packet format, used for DFS and spectral formats. */
struct ath_radar_info {
	u8 pulse_length_pri;
	u8 pulse_length_ext;
	u8 pulse_bw_info;
} __packed;

/* The HT20 spectral data has 4 bytes of additional information at it's end.
 *
 * [7:0]: all bins {max_magnitude[1:0], bitmap_weight[5:0]}
 * [7:0]: all bins  max_magnitude[9:2]
 * [7:0]: all bins {max_index[5:0], max_magnitude[11:10]}
 * [3:0]: max_exp (shift amount to size max bin to 8-bit unsigned)
 */
struct ath_ht20_mag_info {
	u8 all_bins[3];
	u8 max_exp;
} __packed;

/* WARNING: don't actually use this struct! MAC may vary the amount of
 * data by -1/+2. This struct is for reference only.
 */
struct ath_ht20_fft_packet {
	u8 data[SPECTRAL_HT20_NUM_BINS];
	struct ath_ht20_mag_info mag_info;
	struct ath_radar_info radar_info;
} __packed;

#define SPECTRAL_HT20_TOTAL_DATA_LEN	(sizeof(struct ath_ht20_fft_packet))
#define	SPECTRAL_HT20_SAMPLE_LEN	(sizeof(struct ath_ht20_mag_info) +\
					SPECTRAL_HT20_NUM_BINS)

/* Dynamic 20/40 mode:
 *
 * [7:0]: lower bins {max_magnitude[1:0], bitmap_weight[5:0]}
 * [7:0]: lower bins  max_magnitude[9:2]
 * [7:0]: lower bins {max_index[5:0], max_magnitude[11:10]}
 * [7:0]: upper bins {max_magnitude[1:0], bitmap_weight[5:0]}
 * [7:0]: upper bins  max_magnitude[9:2]
 * [7:0]: upper bins {max_index[5:0], max_magnitude[11:10]}
 * [3:0]: max_exp (shift amount to size max bin to 8-bit unsigned)
 */
struct ath_ht20_40_mag_info {
	u8 lower_bins[3];
	u8 upper_bins[3];
	u8 max_exp;
} __packed;

/* WARNING: don't actually use this struct! MAC may vary the amount of
 * data. This struct is for reference only.
 */
struct ath_ht20_40_fft_packet {
	u8 data[SPECTRAL_HT20_40_NUM_BINS];
	struct ath_ht20_40_mag_info mag_info;
	struct ath_radar_info radar_info;
} __packed;

struct ath_spec_scan_priv {
	struct ath_hw *ah;
	/* relay(fs) channel for spectral scan */
	struct rchan *rfs_chan_spec_scan;
	enum spectral_mode spectral_mode;
	struct ath_spec_scan spec_config;
};

#define SPECTRAL_HT20_40_TOTAL_DATA_LEN	(sizeof(struct ath_ht20_40_fft_packet))
#define	SPECTRAL_HT20_40_SAMPLE_LEN	(sizeof(struct ath_ht20_40_mag_info) +\
					SPECTRAL_HT20_40_NUM_BINS)

#define	SPECTRAL_SAMPLE_MAX_LEN		SPECTRAL_HT20_40_SAMPLE_LEN

/* grabs the max magnitude from the all/upper/lower bins */
static inline u16 spectral_max_magnitude(u8 *bins)
{
	return (bins[0] & 0xc0) >> 6 |
	       (bins[1] & 0xff) << 2 |
	       (bins[2] & 0x03) << 10;
}

/* return the max magnitude from the all/upper/lower bins */
static inline u8 spectral_max_index(u8 *bins, int num_bins)
{
	s8 m = (bins[2] & 0xfc) >> 2;
	u8 zero_idx = num_bins / 2;

	/* It's a 5 bit signed int, remove its sign and use one's
	 * complement interpretation to add the sign back to the 8
	 * bit int
	 */
	if (m & 0x20) {
		m &= ~0x20;
		m |= 0xe0;
	}

	/* Bring the zero point to the beginning
	 * instead of the middle so that we can use
	 * it for array lookup and that we don't deal
	 * with negative values later
	 */
	m += zero_idx;

	/* Sanity check to make sure index is within bounds */
	if (m < 0 || m > num_bins - 1)
		m = 0;

	return m;
}

/* return the bitmap weight from the all/upper/lower bins */
static inline u8 spectral_bitmap_weight(u8 *bins)
{
	return bins[0] & 0x3f;
}

void ath9k_cmn_spectral_init_debug(struct ath_spec_scan_priv *spec_priv, struct dentry *debugfs_phy);
void ath9k_cmn_spectral_deinit_debug(struct ath_spec_scan_priv *spec_priv);

void ath9k_cmn_spectral_scan_trigger(struct ath_common *common,
				 struct ath_spec_scan_priv *spec_priv);
int ath9k_cmn_spectral_scan_config(struct ath_common *common,
			       struct ath_spec_scan_priv *spec_priv,
			       enum spectral_mode spectral_mode);
int ath_cmn_process_fft(struct ath_spec_scan_priv *spec_priv, struct ieee80211_hdr *hdr,
		    struct ath_rx_status *rs, u64 tsf);

#endif /* SPECTRAL_H */