2  * Copyright (c) 2008-2011 Atheros Communications Inc.
19 #include "hw-ops.h"
36  * - 20MHz chirp width over a pulse width of  50us
37  * -  5MHz chirp width over a pulse width of 100us
46 /* Threshold for difference of delta peaks */
83 		is_ctl = fft_bitmap_weight(fft->lower_bins) != 0;  in ath9k_get_max_index_ht40()
84 		is_ext = fft_bitmap_weight(fft->upper_bins) != 0;  in ath9k_get_max_index_ht40()
88 			int mag_lower = fft_max_magnitude(fft->lower_bins);  in ath9k_get_max_index_ht40()
89 			int mag_upper = fft_max_magnitude(fft->upper_bins);  in ath9k_get_max_index_ht40()
97 		return fft_max_index(fft->lower_bins);  in ath9k_get_max_index_ht40()
98 	return fft_max_index(fft->upper_bins) + DFS_UPPER_BIN_OFFSET;  in ath9k_get_max_index_ht40()
105 	struct ath_hw *ah = sc->sc_ah;  in ath9k_check_chirping()
109 	if (IS_CHAN_HT40(ah->curchan)) {  in ath9k_check_chirping()
126 		if (IS_CHAN_HT40MINUS(ah->curchan))  in ath9k_check_chirping()
143 		/* in ht20, this is a 6-bit signed number => shift it to 0 */  in ath9k_check_chirping()
151 	 * a) delta of adjacent max_bins is within range  in ath9k_check_chirping()
152 	 * b) delta of adjacent deltas are within tolerance  in ath9k_check_chirping()
156 		int ddelta = -1;  in ath9k_check_chirping()
157 		int delta = max_bin[i + 1] - max_bin[i];  in ath9k_check_chirping()  local
160 		if (abs(delta) < BIN_DELTA_MIN || abs(delta) > BIN_DELTA_MAX) {  in ath9k_check_chirping()
161 			ath_dbg(common, DFS, "CHIRP: invalid delta %d "  in ath9k_check_chirping()
162 				"in sample %d\n", delta, i);  in ath9k_check_chirping()
167 		ddelta = delta - prev_delta;  in ath9k_check_chirping()
174 		ath_dbg(common, DFS, "CHIRP - %d: delta=%d, ddelta=%d\n",  in ath9k_check_chirping()
175 			i, delta, ddelta);  in ath9k_check_chirping()
176 		prev_delta = delta;  in ath9k_check_chirping()
189 	if (IS_CHAN_A_FAST_CLOCK(ah, ah->curchan))  in dur_to_usecs()
211 	ard->pulse_bw_info &= 0x03;  in ath9k_postprocess_radar_event()
213 	switch (ard->pulse_bw_info) {  in ath9k_postprocess_radar_event()
216 		dur = ard->pulse_length_pri;  in ath9k_postprocess_radar_event()
222 		rssi = (ard->ext_rssi >= (ard->rssi + 3)) ? 0 : ard->rssi;  in ath9k_postprocess_radar_event()
226 		dur = ard->pulse_length_ext;  in ath9k_postprocess_radar_event()
232 		rssi = (ard->rssi >= (ard->ext_rssi + 12)) ? 0 : ard->ext_rssi;  in ath9k_postprocess_radar_event()
242 		if (ard->pulse_length_ext >= ard->pulse_length_pri)  in ath9k_postprocess_radar_event()
243 			dur = ard->pulse_length_ext;  in ath9k_postprocess_radar_event()
245 			dur = ard->pulse_length_pri;  in ath9k_postprocess_radar_event()
249 		rssi = max(ard->rssi, ard->ext_rssi);  in ath9k_postprocess_radar_event()
266 	pe->width = dur_to_usecs(sc->sc_ah, dur);  in ath9k_postprocess_radar_event()
267 	pe->rssi = rssi;  in ath9k_postprocess_radar_event()
276 	struct dfs_pattern_detector *pd = sc->dfs_detector;  in ath9k_dfs_process_radar_pulse()
280 	if (!pd->add_pulse(pd, pe, NULL))  in ath9k_dfs_process_radar_pulse()
283 	ieee80211_radar_detected(sc->hw, NULL);  in ath9k_dfs_process_radar_pulse()
287  * DFS: check PHY-error for radar pulse and feed the detector
296 	struct ath_hw *ah = sc->sc_ah;  in ath9k_dfs_process_phyerr()
300 	if ((rs->rs_phyerr != ATH9K_PHYERR_RADAR) &&  in ath9k_dfs_process_phyerr()
301 	    (rs->rs_phyerr != ATH9K_PHYERR_FALSE_RADAR_EXT)) {  in ath9k_dfs_process_phyerr()
303 			"Error: rs_phyer=0x%x not a radar error\n",  in ath9k_dfs_process_phyerr()
304 			rs->rs_phyerr);  in ath9k_dfs_process_phyerr()
309 	datalen = rs->rs_datalen;  in ath9k_dfs_process_phyerr()
315 	ard.rssi = rs->rs_rssi_ctl[0];  in ath9k_dfs_process_phyerr()
316 	ard.ext_rssi = rs->rs_rssi_ext[0];  in ath9k_dfs_process_phyerr()
328 	ard.pulse_bw_info = vdata_end[-1];  in ath9k_dfs_process_phyerr()
329 	ard.pulse_length_ext = vdata_end[-2];  in ath9k_dfs_process_phyerr()
330 	ard.pulse_length_pri = vdata_end[-3];  in ath9k_dfs_process_phyerr()
331 	pe.freq = ah->curchan->channel;  in ath9k_dfs_process_phyerr()
340 		int clen = datalen - 3;  in ath9k_dfs_process_phyerr()
350 		pe.ts - sc->dfs_prev_pulse_ts);  in ath9k_dfs_process_phyerr()
351 	sc->dfs_prev_pulse_ts = pe.ts;  in ath9k_dfs_process_phyerr()
354 	if (IS_CHAN_HT40(ah->curchan) &&  in ath9k_dfs_process_phyerr()
356 		pe.freq += IS_CHAN_HT40PLUS(ah->curchan) ? 20 : -20;  in ath9k_dfs_process_phyerr()