2 * Copyright (c) 2008-2011 Atheros Communications Inc.
3 * Copyright (c) 2011 Neratec Solutions AG
5 * Permission to use, copy, modify, and/or distribute this software for any
6 * purpose with or without fee is hereby granted, provided that the above
7 * copyright notice and this permission notice appear in all copies.
9 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
10 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
11 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
12 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
13 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
14 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
15 * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
22 #include "dfs_debug.h"
24 /* internal struct to pass radar data */
25 struct ath_radar_data {
33 /* convert pulse duration to usecs, considering clock mode */
34 static u32 dur_to_usecs(struct ath_hw *ah, u32 dur)
36 const u32 AR93X_NSECS_PER_DUR = 800;
37 const u32 AR93X_NSECS_PER_DUR_FAST = (8000 / 11);
40 if (IS_CHAN_A_FAST_CLOCK(ah, ah->curchan))
41 nsecs = dur * AR93X_NSECS_PER_DUR_FAST;
43 nsecs = dur * AR93X_NSECS_PER_DUR;
45 return (nsecs + 500) / 1000;
48 #define PRI_CH_RADAR_FOUND 0x01
49 #define EXT_CH_RADAR_FOUND 0x02
51 ath9k_postprocess_radar_event(struct ath_softc *sc,
52 struct ath_radar_data *ard,
53 struct pulse_event *pe)
58 ath_dbg(ath9k_hw_common(sc->sc_ah), DFS,
59 "pulse_bw_info=0x%x, pri,ext len/rssi=(%u/%u, %u/%u)\n",
61 ard->pulse_length_pri, ard->rssi,
62 ard->pulse_length_ext, ard->ext_rssi);
65 * Only the last 2 bits of the BW info are relevant, they indicate
66 * which channel the radar was detected in.
68 ard->pulse_bw_info &= 0x03;
70 switch (ard->pulse_bw_info) {
71 case PRI_CH_RADAR_FOUND:
72 /* radar in ctrl channel */
73 dur = ard->pulse_length_pri;
74 DFS_STAT_INC(sc, pri_phy_errors);
76 * cannot use ctrl channel RSSI
77 * if extension channel is stronger
79 rssi = (ard->ext_rssi >= (ard->rssi + 3)) ? 0 : ard->rssi;
81 case EXT_CH_RADAR_FOUND:
82 /* radar in extension channel */
83 dur = ard->pulse_length_ext;
84 DFS_STAT_INC(sc, ext_phy_errors);
86 * cannot use extension channel RSSI
87 * if control channel is stronger
89 rssi = (ard->rssi >= (ard->ext_rssi + 12)) ? 0 : ard->ext_rssi;
91 case (PRI_CH_RADAR_FOUND | EXT_CH_RADAR_FOUND):
93 * Conducted testing, when pulse is on DC, both pri and ext
94 * durations are reported to be same
96 * Radiated testing, when pulse is on DC, different pri and
97 * ext durations are reported, so take the larger of the two
99 if (ard->pulse_length_ext >= ard->pulse_length_pri)
100 dur = ard->pulse_length_ext;
102 dur = ard->pulse_length_pri;
103 DFS_STAT_INC(sc, dc_phy_errors);
105 /* when both are present use stronger one */
106 rssi = (ard->rssi < ard->ext_rssi) ? ard->ext_rssi : ard->rssi;
110 * Bogus bandwidth info was received in descriptor,
111 * so ignore this PHY error
113 DFS_STAT_INC(sc, bwinfo_discards);
118 DFS_STAT_INC(sc, rssi_discards);
123 * TODO: check chirping pulses
124 * checks for chirping are dependent on the DFS regulatory domain
125 * used, which is yet TBD
128 /* convert duration to usecs */
129 pe->width = dur_to_usecs(sc->sc_ah, dur);
132 DFS_STAT_INC(sc, pulses_detected);
135 #undef PRI_CH_RADAR_FOUND
136 #undef EXT_CH_RADAR_FOUND
139 * DFS: check PHY-error for radar pulse and feed the detector
141 void ath9k_dfs_process_phyerr(struct ath_softc *sc, void *data,
142 struct ath_rx_status *rs, u64 mactime)
144 struct ath_radar_data ard;
147 struct pulse_event pe;
148 struct ath_hw *ah = sc->sc_ah;
149 struct ath_common *common = ath9k_hw_common(ah);
151 DFS_STAT_INC(sc, pulses_total);
152 if ((rs->rs_phyerr != ATH9K_PHYERR_RADAR) &&
153 (rs->rs_phyerr != ATH9K_PHYERR_FALSE_RADAR_EXT)) {
155 "Error: rs_phyer=0x%x not a radar error\n",
157 DFS_STAT_INC(sc, pulses_no_dfs);
161 datalen = rs->rs_datalen;
163 DFS_STAT_INC(sc, datalen_discards);
167 ard.rssi = rs->rs_rssi_ctl0;
168 ard.ext_rssi = rs->rs_rssi_ext0;
171 * hardware stores this as 8 bit signed value.
172 * we will cap it at 0 if it is a negative number
176 if (ard.ext_rssi & 0x80)
179 vdata_end = (char *)data + datalen;
180 ard.pulse_bw_info = vdata_end[-1];
181 ard.pulse_length_ext = vdata_end[-2];
182 ard.pulse_length_pri = vdata_end[-3];
183 pe.freq = ah->curchan->channel;
185 if (ath9k_postprocess_radar_event(sc, &ard, &pe)) {
186 struct dfs_pattern_detector *pd = sc->dfs_detector;
189 "ath9k_dfs_process_phyerr: channel=%d, ts=%llu, "
190 "width=%d, rssi=%d, delta_ts=%llu\n",
191 pe.freq, pe.ts, pe.width, pe.rssi, pe.ts-last_ts);
193 DFS_STAT_INC(sc, pulses_processed);
194 if (pd != NULL && pd->add_pulse(pd, &pe)) {
195 DFS_STAT_INC(sc, radar_detected);
197 * TODO: forward radar event to DFS management layer