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1/*
2 * Copyright (c) 2013 Qualcomm Atheros, Inc.
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#ifndef SPECTRAL_H
18#define SPECTRAL_H
19
20#include "../spectral_common.h"
21
22/* enum spectral_mode:
23 *
24 * @SPECTRAL_DISABLED: spectral mode is disabled
25 * @SPECTRAL_BACKGROUND: hardware sends samples when it is not busy with
26 * something else.
27 * @SPECTRAL_MANUAL: spectral scan is enabled, triggering for samples
28 * is performed manually.
29 * @SPECTRAL_CHANSCAN: Like manual, but also triggered when changing channels
30 * during a channel scan.
31 */
32enum spectral_mode {
33 SPECTRAL_DISABLED = 0,
34 SPECTRAL_BACKGROUND,
35 SPECTRAL_MANUAL,
36 SPECTRAL_CHANSCAN,
37};
38
39#define SPECTRAL_SCAN_BITMASK 0x10
40/* Radar info packet format, used for DFS and spectral formats. */
41struct ath_radar_info {
42 u8 pulse_length_pri;
43 u8 pulse_length_ext;
44 u8 pulse_bw_info;
45} __packed;
46
47/* The HT20 spectral data has 4 bytes of additional information at it's end.
48 *
49 * [7:0]: all bins {max_magnitude[1:0], bitmap_weight[5:0]}
50 * [7:0]: all bins max_magnitude[9:2]
51 * [7:0]: all bins {max_index[5:0], max_magnitude[11:10]}
52 * [3:0]: max_exp (shift amount to size max bin to 8-bit unsigned)
53 */
54struct ath_ht20_mag_info {
55 u8 all_bins[3];
56 u8 max_exp;
57} __packed;
58
59/* WARNING: don't actually use this struct! MAC may vary the amount of
60 * data by -1/+2. This struct is for reference only.
61 */
62struct ath_ht20_fft_packet {
63 u8 data[SPECTRAL_HT20_NUM_BINS];
64 struct ath_ht20_mag_info mag_info;
65 struct ath_radar_info radar_info;
66} __packed;
67
68#define SPECTRAL_HT20_TOTAL_DATA_LEN (sizeof(struct ath_ht20_fft_packet))
69#define SPECTRAL_HT20_SAMPLE_LEN (sizeof(struct ath_ht20_mag_info) +\
70 SPECTRAL_HT20_NUM_BINS)
71
72/* Dynamic 20/40 mode:
73 *
74 * [7:0]: lower bins {max_magnitude[1:0], bitmap_weight[5:0]}
75 * [7:0]: lower bins max_magnitude[9:2]
76 * [7:0]: lower bins {max_index[5:0], max_magnitude[11:10]}
77 * [7:0]: upper bins {max_magnitude[1:0], bitmap_weight[5:0]}
78 * [7:0]: upper bins max_magnitude[9:2]
79 * [7:0]: upper bins {max_index[5:0], max_magnitude[11:10]}
80 * [3:0]: max_exp (shift amount to size max bin to 8-bit unsigned)
81 */
82struct ath_ht20_40_mag_info {
83 u8 lower_bins[3];
84 u8 upper_bins[3];
85 u8 max_exp;
86} __packed;
87
88/* WARNING: don't actually use this struct! MAC may vary the amount of
89 * data. This struct is for reference only.
90 */
91struct ath_ht20_40_fft_packet {
92 u8 data[SPECTRAL_HT20_40_NUM_BINS];
93 struct ath_ht20_40_mag_info mag_info;
94 struct ath_radar_info radar_info;
95} __packed;
96
97struct ath_spec_scan_priv {
98 struct ath_hw *ah;
99 /* relay(fs) channel for spectral scan */
100 struct rchan *rfs_chan_spec_scan;
101 enum spectral_mode spectral_mode;
102 struct ath_spec_scan spec_config;
103};
104
105#define SPECTRAL_HT20_40_TOTAL_DATA_LEN (sizeof(struct ath_ht20_40_fft_packet))
106#define SPECTRAL_HT20_40_SAMPLE_LEN (sizeof(struct ath_ht20_40_mag_info) +\
107 SPECTRAL_HT20_40_NUM_BINS)
108
109#define SPECTRAL_SAMPLE_MAX_LEN SPECTRAL_HT20_40_SAMPLE_LEN
110
111/* grabs the max magnitude from the all/upper/lower bins */
112static inline u16 spectral_max_magnitude(u8 *bins)
113{
114 return (bins[0] & 0xc0) >> 6 |
115 (bins[1] & 0xff) << 2 |
116 (bins[2] & 0x03) << 10;
117}
118
119/* return the max magnitude from the all/upper/lower bins */
120static inline u8 spectral_max_index(u8 *bins, int num_bins)
121{
122 s8 m = (bins[2] & 0xfc) >> 2;
123 u8 zero_idx = num_bins / 2;
124
125 /* It's a 5 bit signed int, remove its sign and use one's
126 * complement interpretation to add the sign back to the 8
127 * bit int
128 */
129 if (m & 0x20) {
130 m &= ~0x20;
131 m |= 0xe0;
132 }
133
134 /* Bring the zero point to the beginning
135 * instead of the middle so that we can use
136 * it for array lookup and that we don't deal
137 * with negative values later
138 */
139 m += zero_idx;
140
141 /* Sanity check to make sure index is within bounds */
142 if (m < 0 || m > num_bins - 1)
143 m = 0;
144
145 return m;
146}
147
148static inline u8 spectral_max_index_ht40(u8 *bins)
149{
150 u8 idx;
151
152 idx = spectral_max_index(bins, SPECTRAL_HT20_40_NUM_BINS);
153
154 /* positive values and zero are starting at the beginning
155 * of the data field.
156 */
157 return idx % (SPECTRAL_HT20_40_NUM_BINS / 2);
158}
159
160static inline u8 spectral_max_index_ht20(u8 *bins)
161{
162 return spectral_max_index(bins, SPECTRAL_HT20_NUM_BINS);
163}
164
165/* return the bitmap weight from the all/upper/lower bins */
166static inline u8 spectral_bitmap_weight(u8 *bins)
167{
168 return bins[0] & 0x3f;
169}
170
171#ifdef CONFIG_ATH9K_COMMON_SPECTRAL
172void ath9k_cmn_spectral_init_debug(struct ath_spec_scan_priv *spec_priv, struct dentry *debugfs_phy);
173void ath9k_cmn_spectral_deinit_debug(struct ath_spec_scan_priv *spec_priv);
174
175void ath9k_cmn_spectral_scan_trigger(struct ath_common *common,
176 struct ath_spec_scan_priv *spec_priv);
177int ath9k_cmn_spectral_scan_config(struct ath_common *common,
178 struct ath_spec_scan_priv *spec_priv,
179 enum spectral_mode spectral_mode);
180int ath_cmn_process_fft(struct ath_spec_scan_priv *spec_priv, struct ieee80211_hdr *hdr,
181 struct ath_rx_status *rs, u64 tsf);
182#else
183static inline void ath9k_cmn_spectral_init_debug(struct ath_spec_scan_priv *spec_priv,
184 struct dentry *debugfs_phy)
185{
186}
187
188static inline void ath9k_cmn_spectral_deinit_debug(struct ath_spec_scan_priv *spec_priv)
189{
190}
191
192static inline void ath9k_cmn_spectral_scan_trigger(struct ath_common *common,
193 struct ath_spec_scan_priv *spec_priv)
194{
195}
196
197static inline int ath_cmn_process_fft(struct ath_spec_scan_priv *spec_priv,
198 struct ieee80211_hdr *hdr,
199 struct ath_rx_status *rs, u64 tsf)
200{
201 return 0;
202}
203#endif /* CONFIG_ATH9K_COMMON_SPECTRAL */
204
205#endif /* SPECTRAL_H */