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ath9k: add HT40 spectral scan capability

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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>
This commit is contained in:
Lorenzo Bianconi 2013-10-11 14:09:55 +02:00 committed by John W. Linville
parent 5bc225acfe
commit e07f01e4c7
2 changed files with 137 additions and 38 deletions
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29
drivers/net/wireless/ath/ath9k/ath9k.h
View File

@ -886,6 +886,7 @@ static inline u8 spectral_bitmap_weight(u8 *bins)
*/
enum ath_fft_sample_type {
ATH_FFT_SAMPLE_HT20 = 1,
ATH_FFT_SAMPLE_HT20_40,
};
struct fft_sample_tlv {
@ -912,6 +913,34 @@ struct fft_sample_ht20 {
u8 data[SPECTRAL_HT20_NUM_BINS];
} __packed;
struct fft_sample_ht20_40 {
struct fft_sample_tlv tlv;
u8 channel_type;
__be16 freq;
s8 lower_rssi;
s8 upper_rssi;
__be64 tsf;
s8 lower_noise;
s8 upper_noise;
__be16 lower_max_magnitude;
__be16 upper_max_magnitude;
u8 lower_max_index;
u8 upper_max_index;
u8 lower_bitmap_weight;
u8 upper_bitmap_weight;
u8 max_exp;
u8 data[SPECTRAL_HT20_40_NUM_BINS];
} __packed;
void ath9k_tasklet(unsigned long data);
int ath_cabq_update(struct ath_softc *);

146
drivers/net/wireless/ath/ath9k/recv.c
View File

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