206 lines
6.1 KiB
C
206 lines
6.1 KiB
C
/*
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* Copyright (c) 2013 Qualcomm Atheros, Inc.
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*
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* Permission to use, copy, modify, and/or distribute this software for any
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* purpose with or without fee is hereby granted, provided that the above
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* copyright notice and this permission notice appear in all copies.
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*
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* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
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* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
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* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
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* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
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* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
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* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
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* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
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*/
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#ifndef SPECTRAL_H
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#define SPECTRAL_H
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#include "../spectral_common.h"
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/* enum spectral_mode:
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*
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* @SPECTRAL_DISABLED: spectral mode is disabled
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* @SPECTRAL_BACKGROUND: hardware sends samples when it is not busy with
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* something else.
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* @SPECTRAL_MANUAL: spectral scan is enabled, triggering for samples
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* is performed manually.
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* @SPECTRAL_CHANSCAN: Like manual, but also triggered when changing channels
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* during a channel scan.
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*/
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enum spectral_mode {
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SPECTRAL_DISABLED = 0,
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SPECTRAL_BACKGROUND,
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SPECTRAL_MANUAL,
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SPECTRAL_CHANSCAN,
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};
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#define SPECTRAL_SCAN_BITMASK 0x10
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/* Radar info packet format, used for DFS and spectral formats. */
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struct ath_radar_info {
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u8 pulse_length_pri;
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u8 pulse_length_ext;
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u8 pulse_bw_info;
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} __packed;
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/* The HT20 spectral data has 4 bytes of additional information at it's end.
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*
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* [7:0]: all bins {max_magnitude[1:0], bitmap_weight[5:0]}
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* [7:0]: all bins max_magnitude[9:2]
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* [7:0]: all bins {max_index[5:0], max_magnitude[11:10]}
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* [3:0]: max_exp (shift amount to size max bin to 8-bit unsigned)
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*/
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struct ath_ht20_mag_info {
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u8 all_bins[3];
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u8 max_exp;
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} __packed;
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/* WARNING: don't actually use this struct! MAC may vary the amount of
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* data by -1/+2. This struct is for reference only.
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*/
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struct ath_ht20_fft_packet {
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u8 data[SPECTRAL_HT20_NUM_BINS];
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struct ath_ht20_mag_info mag_info;
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struct ath_radar_info radar_info;
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} __packed;
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#define SPECTRAL_HT20_TOTAL_DATA_LEN (sizeof(struct ath_ht20_fft_packet))
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#define SPECTRAL_HT20_SAMPLE_LEN (sizeof(struct ath_ht20_mag_info) +\
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SPECTRAL_HT20_NUM_BINS)
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/* Dynamic 20/40 mode:
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*
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* [7:0]: lower bins {max_magnitude[1:0], bitmap_weight[5:0]}
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* [7:0]: lower bins max_magnitude[9:2]
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* [7:0]: lower bins {max_index[5:0], max_magnitude[11:10]}
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* [7:0]: upper bins {max_magnitude[1:0], bitmap_weight[5:0]}
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* [7:0]: upper bins max_magnitude[9:2]
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* [7:0]: upper bins {max_index[5:0], max_magnitude[11:10]}
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* [3:0]: max_exp (shift amount to size max bin to 8-bit unsigned)
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*/
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struct ath_ht20_40_mag_info {
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u8 lower_bins[3];
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u8 upper_bins[3];
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u8 max_exp;
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} __packed;
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/* WARNING: don't actually use this struct! MAC may vary the amount of
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* data. This struct is for reference only.
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*/
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struct ath_ht20_40_fft_packet {
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u8 data[SPECTRAL_HT20_40_NUM_BINS];
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struct ath_ht20_40_mag_info mag_info;
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struct ath_radar_info radar_info;
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} __packed;
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struct ath_spec_scan_priv {
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struct ath_hw *ah;
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/* relay(fs) channel for spectral scan */
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struct rchan *rfs_chan_spec_scan;
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enum spectral_mode spectral_mode;
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struct ath_spec_scan spec_config;
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};
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#define SPECTRAL_HT20_40_TOTAL_DATA_LEN (sizeof(struct ath_ht20_40_fft_packet))
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#define SPECTRAL_HT20_40_SAMPLE_LEN (sizeof(struct ath_ht20_40_mag_info) +\
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SPECTRAL_HT20_40_NUM_BINS)
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#define SPECTRAL_SAMPLE_MAX_LEN SPECTRAL_HT20_40_SAMPLE_LEN
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/* grabs the max magnitude from the all/upper/lower bins */
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static inline u16 spectral_max_magnitude(u8 *bins)
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{
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return (bins[0] & 0xc0) >> 6 |
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(bins[1] & 0xff) << 2 |
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(bins[2] & 0x03) << 10;
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}
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/* return the max magnitude from the all/upper/lower bins */
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static inline u8 spectral_max_index(u8 *bins, int num_bins)
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{
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s8 m = (bins[2] & 0xfc) >> 2;
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u8 zero_idx = num_bins / 2;
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/* It's a 5 bit signed int, remove its sign and use one's
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* complement interpretation to add the sign back to the 8
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* bit int
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*/
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if (m & 0x20) {
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m &= ~0x20;
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m |= 0xe0;
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}
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/* Bring the zero point to the beginning
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* instead of the middle so that we can use
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* it for array lookup and that we don't deal
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* with negative values later
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*/
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m += zero_idx;
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/* Sanity check to make sure index is within bounds */
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if (m < 0 || m > num_bins - 1)
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m = 0;
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return m;
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}
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static inline u8 spectral_max_index_ht40(u8 *bins)
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{
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u8 idx;
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idx = spectral_max_index(bins, SPECTRAL_HT20_40_NUM_BINS);
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/* positive values and zero are starting at the beginning
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* of the data field.
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*/
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return idx % (SPECTRAL_HT20_40_NUM_BINS / 2);
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}
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static inline u8 spectral_max_index_ht20(u8 *bins)
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{
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return spectral_max_index(bins, SPECTRAL_HT20_NUM_BINS);
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}
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/* return the bitmap weight from the all/upper/lower bins */
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static inline u8 spectral_bitmap_weight(u8 *bins)
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{
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return bins[0] & 0x3f;
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}
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#ifdef CONFIG_ATH9K_COMMON_SPECTRAL
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void ath9k_cmn_spectral_init_debug(struct ath_spec_scan_priv *spec_priv, struct dentry *debugfs_phy);
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void ath9k_cmn_spectral_deinit_debug(struct ath_spec_scan_priv *spec_priv);
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void ath9k_cmn_spectral_scan_trigger(struct ath_common *common,
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struct ath_spec_scan_priv *spec_priv);
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int ath9k_cmn_spectral_scan_config(struct ath_common *common,
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struct ath_spec_scan_priv *spec_priv,
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enum spectral_mode spectral_mode);
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int ath_cmn_process_fft(struct ath_spec_scan_priv *spec_priv, struct ieee80211_hdr *hdr,
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struct ath_rx_status *rs, u64 tsf);
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#else
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static inline void ath9k_cmn_spectral_init_debug(struct ath_spec_scan_priv *spec_priv,
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struct dentry *debugfs_phy)
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{
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}
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static inline void ath9k_cmn_spectral_deinit_debug(struct ath_spec_scan_priv *spec_priv)
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{
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}
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static inline void ath9k_cmn_spectral_scan_trigger(struct ath_common *common,
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struct ath_spec_scan_priv *spec_priv)
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{
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}
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static inline int ath_cmn_process_fft(struct ath_spec_scan_priv *spec_priv,
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struct ieee80211_hdr *hdr,
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struct ath_rx_status *rs, u64 tsf)
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{
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return 0;
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}
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#endif /* CONFIG_ATH9K_COMMON_SPECTRAL */
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#endif /* SPECTRAL_H */
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