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ath9k: add HT40 spectral scan capability
Add spectral scan feature on HT40 channels for ath9k. This patch extends previous capability added by Simon Wunderlich Signed-off-by: Lorenzo Bianconi <lorenzo.bianconi83@gmail.com> Reviewed-by: Simon Wunderlich <simon.wunderlich@s2003.tu-chemnitz.de> Tested-by: Simon Wunderlich <simon.wunderlich@s2003.tu-chemnitz.de> Signed-off-by: John W. Linville <linville@tuxdriver.com>
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@ -886,6 +886,7 @@ static inline u8 spectral_bitmap_weight(u8 *bins)
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*/
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enum ath_fft_sample_type {
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ATH_FFT_SAMPLE_HT20 = 1,
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ATH_FFT_SAMPLE_HT20_40,
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};
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struct fft_sample_tlv {
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@ -912,6 +913,34 @@ struct fft_sample_ht20 {
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u8 data[SPECTRAL_HT20_NUM_BINS];
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} __packed;
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struct fft_sample_ht20_40 {
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struct fft_sample_tlv tlv;
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u8 channel_type;
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__be16 freq;
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s8 lower_rssi;
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s8 upper_rssi;
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__be64 tsf;
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s8 lower_noise;
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s8 upper_noise;
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__be16 lower_max_magnitude;
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__be16 upper_max_magnitude;
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u8 lower_max_index;
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u8 upper_max_index;
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u8 lower_bitmap_weight;
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u8 upper_bitmap_weight;
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u8 max_exp;
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u8 data[SPECTRAL_HT20_40_NUM_BINS];
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} __packed;
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void ath9k_tasklet(unsigned long data);
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int ath_cabq_update(struct ath_softc *);
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@ -972,14 +972,15 @@ static int ath_process_fft(struct ath_softc *sc, struct ieee80211_hdr *hdr,
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{
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#ifdef CONFIG_ATH9K_DEBUGFS
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struct ath_hw *ah = sc->sc_ah;
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u8 bins[SPECTRAL_HT20_NUM_BINS];
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u8 *vdata = (u8 *)hdr;
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struct fft_sample_ht20 fft_sample;
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u8 num_bins, *bins, *vdata = (u8 *)hdr;
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struct fft_sample_ht20 fft_sample_20;
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struct fft_sample_ht20_40 fft_sample_40;
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struct fft_sample_tlv *tlv;
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struct ath_radar_info *radar_info;
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struct ath_ht20_mag_info *mag_info;
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int len = rs->rs_datalen;
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int dc_pos;
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u16 length, max_magnitude;
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u16 fft_len, length, freq = ah->curchan->chan->center_freq;
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enum nl80211_channel_type chan_type;
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/* AR9280 and before report via ATH9K_PHYERR_RADAR, AR93xx and newer
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* via ATH9K_PHYERR_SPECTRAL. Haven't seen ATH9K_PHYERR_FALSE_RADAR_EXT
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@ -997,45 +998,44 @@ static int ath_process_fft(struct ath_softc *sc, struct ieee80211_hdr *hdr,
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if (!(radar_info->pulse_bw_info & SPECTRAL_SCAN_BITMASK))
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return 0;
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/* Variation in the data length is possible and will be fixed later.
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* Note that we only support HT20 for now.
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*
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* TODO: add HT20_40 support as well.
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*/
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if ((len > SPECTRAL_HT20_TOTAL_DATA_LEN + 2) ||
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(len < SPECTRAL_HT20_TOTAL_DATA_LEN - 1))
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chan_type = cfg80211_get_chandef_type(&sc->hw->conf.chandef);
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if ((chan_type == NL80211_CHAN_HT40MINUS) ||
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(chan_type == NL80211_CHAN_HT40PLUS)) {
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fft_len = SPECTRAL_HT20_40_TOTAL_DATA_LEN;
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num_bins = SPECTRAL_HT20_40_NUM_BINS;
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bins = (u8 *)fft_sample_40.data;
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} else {
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fft_len = SPECTRAL_HT20_TOTAL_DATA_LEN;
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num_bins = SPECTRAL_HT20_NUM_BINS;
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bins = (u8 *)fft_sample_20.data;
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}
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/* Variation in the data length is possible and will be fixed later */
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if ((len > fft_len + 2) || (len < fft_len - 1))
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return 1;
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fft_sample.tlv.type = ATH_FFT_SAMPLE_HT20;
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length = sizeof(fft_sample) - sizeof(fft_sample.tlv);
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fft_sample.tlv.length = __cpu_to_be16(length);
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fft_sample.freq = __cpu_to_be16(ah->curchan->chan->center_freq);
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fft_sample.rssi = fix_rssi_inv_only(rs->rs_rssi_ctl0);
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fft_sample.noise = ah->noise;
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switch (len - SPECTRAL_HT20_TOTAL_DATA_LEN) {
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switch (len - fft_len) {
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case 0:
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/* length correct, nothing to do. */
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memcpy(bins, vdata, SPECTRAL_HT20_NUM_BINS);
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memcpy(bins, vdata, num_bins);
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break;
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case -1:
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/* first byte missing, duplicate it. */
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memcpy(&bins[1], vdata, SPECTRAL_HT20_NUM_BINS - 1);
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memcpy(&bins[1], vdata, num_bins - 1);
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bins[0] = vdata[0];
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break;
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case 2:
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/* MAC added 2 extra bytes at bin 30 and 32, remove them. */
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memcpy(bins, vdata, 30);
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bins[30] = vdata[31];
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memcpy(&bins[31], &vdata[33], SPECTRAL_HT20_NUM_BINS - 31);
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memcpy(&bins[31], &vdata[33], num_bins - 31);
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break;
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case 1:
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/* MAC added 2 extra bytes AND first byte is missing. */
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bins[0] = vdata[0];
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memcpy(&bins[0], vdata, 30);
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memcpy(&bins[1], vdata, 30);
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bins[31] = vdata[31];
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memcpy(&bins[32], &vdata[33], SPECTRAL_HT20_NUM_BINS - 32);
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memcpy(&bins[32], &vdata[33], num_bins - 32);
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break;
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default:
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return 1;
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@ -1044,23 +1044,93 @@ static int ath_process_fft(struct ath_softc *sc, struct ieee80211_hdr *hdr,
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/* DC value (value in the middle) is the blind spot of the spectral
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* sample and invalid, interpolate it.
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*/
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dc_pos = SPECTRAL_HT20_NUM_BINS / 2;
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dc_pos = num_bins / 2;
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bins[dc_pos] = (bins[dc_pos + 1] + bins[dc_pos - 1]) / 2;
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/* mag data is at the end of the frame, in front of radar_info */
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mag_info = ((struct ath_ht20_mag_info *)radar_info) - 1;
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if ((chan_type == NL80211_CHAN_HT40MINUS) ||
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(chan_type == NL80211_CHAN_HT40PLUS)) {
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s8 lower_rssi, upper_rssi;
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s16 ext_nf;
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u8 lower_max_index, upper_max_index;
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u8 lower_bitmap_w, upper_bitmap_w;
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u16 lower_mag, upper_mag;
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struct ath9k_hw_cal_data *caldata = ah->caldata;
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struct ath_ht20_40_mag_info *mag_info;
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/* copy raw bins without scaling them */
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memcpy(fft_sample.data, bins, SPECTRAL_HT20_NUM_BINS);
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fft_sample.max_exp = mag_info->max_exp & 0xf;
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if (caldata)
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ext_nf = ath9k_hw_getchan_noise(ah, ah->curchan,
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caldata->nfCalHist[3].privNF);
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else
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ext_nf = ATH_DEFAULT_NOISE_FLOOR;
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max_magnitude = spectral_max_magnitude(mag_info->all_bins);
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fft_sample.max_magnitude = __cpu_to_be16(max_magnitude);
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fft_sample.max_index = spectral_max_index(mag_info->all_bins);
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fft_sample.bitmap_weight = spectral_bitmap_weight(mag_info->all_bins);
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fft_sample.tsf = __cpu_to_be64(tsf);
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length = sizeof(fft_sample_40) - sizeof(struct fft_sample_tlv);
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fft_sample_40.tlv.type = ATH_FFT_SAMPLE_HT20_40;
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fft_sample_40.tlv.length = __cpu_to_be16(length);
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fft_sample_40.freq = __cpu_to_be16(freq);
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fft_sample_40.channel_type = chan_type;
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ath_debug_send_fft_sample(sc, &fft_sample.tlv);
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if (chan_type == NL80211_CHAN_HT40PLUS) {
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lower_rssi = fix_rssi_inv_only(rs->rs_rssi_ctl0);
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upper_rssi = fix_rssi_inv_only(rs->rs_rssi_ext0);
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fft_sample_40.lower_noise = ah->noise;
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fft_sample_40.upper_noise = ext_nf;
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} else {
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lower_rssi = fix_rssi_inv_only(rs->rs_rssi_ext0);
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upper_rssi = fix_rssi_inv_only(rs->rs_rssi_ctl0);
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fft_sample_40.lower_noise = ext_nf;
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fft_sample_40.upper_noise = ah->noise;
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}
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fft_sample_40.lower_rssi = lower_rssi;
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fft_sample_40.upper_rssi = upper_rssi;
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mag_info = ((struct ath_ht20_40_mag_info *)radar_info) - 1;
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lower_mag = spectral_max_magnitude(mag_info->lower_bins);
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upper_mag = spectral_max_magnitude(mag_info->upper_bins);
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fft_sample_40.lower_max_magnitude = __cpu_to_be16(lower_mag);
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fft_sample_40.upper_max_magnitude = __cpu_to_be16(upper_mag);
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lower_max_index = spectral_max_index(mag_info->lower_bins);
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upper_max_index = spectral_max_index(mag_info->upper_bins);
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fft_sample_40.lower_max_index = lower_max_index;
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fft_sample_40.upper_max_index = upper_max_index;
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lower_bitmap_w = spectral_bitmap_weight(mag_info->lower_bins);
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upper_bitmap_w = spectral_bitmap_weight(mag_info->upper_bins);
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fft_sample_40.lower_bitmap_weight = lower_bitmap_w;
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fft_sample_40.upper_bitmap_weight = upper_bitmap_w;
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fft_sample_40.max_exp = mag_info->max_exp & 0xf;
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fft_sample_40.tsf = __cpu_to_be64(tsf);
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tlv = (struct fft_sample_tlv *)&fft_sample_40;
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} else {
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u8 max_index, bitmap_w;
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u16 magnitude;
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struct ath_ht20_mag_info *mag_info;
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length = sizeof(fft_sample_20) - sizeof(struct fft_sample_tlv);
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fft_sample_20.tlv.type = ATH_FFT_SAMPLE_HT20;
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fft_sample_20.tlv.length = __cpu_to_be16(length);
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fft_sample_20.freq = __cpu_to_be16(freq);
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fft_sample_20.rssi = fix_rssi_inv_only(rs->rs_rssi_ctl0);
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fft_sample_20.noise = ah->noise;
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mag_info = ((struct ath_ht20_mag_info *)radar_info) - 1;
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magnitude = spectral_max_magnitude(mag_info->all_bins);
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fft_sample_20.max_magnitude = __cpu_to_be16(magnitude);
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max_index = spectral_max_index(mag_info->all_bins);
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fft_sample_20.max_index = max_index;
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bitmap_w = spectral_bitmap_weight(mag_info->all_bins);
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fft_sample_20.bitmap_weight = bitmap_w;
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fft_sample_20.max_exp = mag_info->max_exp & 0xf;
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fft_sample_20.tsf = __cpu_to_be64(tsf);
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tlv = (struct fft_sample_tlv *)&fft_sample_20;
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}
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ath_debug_send_fft_sample(sc, tlv);
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return 1;
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#else
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return 0;
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