drivers/net/wireless/ath/ath9k/common-spectral.h

   1 /*
   2  * Copyright (c) 2013 Qualcomm Atheros, Inc.
   3  *
   4  * Permission to use, copy, modify, and/or distribute this software for any
   5  * purpose with or without fee is hereby granted, provided that the above
   6  * copyright notice and this permission notice appear in all copies.
   7  *
   8  * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
   9  * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
  10  * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
  11  * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
  12  * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
  13  * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
  14  * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
  15  */
  16
  17 #ifndef SPECTRAL_H
  18 #define SPECTRAL_H
  19
  20 #include "../spectral_common.h"
  21
  22 /* enum spectral_mode:
  23  *
  24  * @SPECTRAL_DISABLED: spectral mode is disabled
  25  * @SPECTRAL_BACKGROUND: hardware sends samples when it is not busy with
  26  *      something else.
  27  * @SPECTRAL_MANUAL: spectral scan is enabled, triggering for samples
  28  *      is performed manually.
  29  * @SPECTRAL_CHANSCAN: Like manual, but also triggered when changing channels
  30  *      during a channel scan.
  31  */
  32 enum spectral_mode {
  33         SPECTRAL_DISABLED = 0,
  34         SPECTRAL_BACKGROUND,
  35         SPECTRAL_MANUAL,
  36         SPECTRAL_CHANSCAN,
  37 };
  38
  39 #define SPECTRAL_SCAN_BITMASK           0x10
  40 /* Radar info packet format, used for DFS and spectral formats. */
  41 struct ath_radar_info {
  42         u8 pulse_length_pri;
  43         u8 pulse_length_ext;
  44         u8 pulse_bw_info;
  45 } __packed;
  46
  47 /* The HT20 spectral data has 4 bytes of additional information at it's end.
  48  *
  49  * [7:0]: all bins {max_magnitude[1:0], bitmap_weight[5:0]}
  50  * [7:0]: all bins  max_magnitude[9:2]
  51  * [7:0]: all bins {max_index[5:0], max_magnitude[11:10]}
  52  * [3:0]: max_exp (shift amount to size max bin to 8-bit unsigned)
  53  */
  54 struct ath_ht20_mag_info {
  55         u8 all_bins[3];
  56         u8 max_exp;
  57 } __packed;
  58
  59 /* WARNING: don't actually use this struct! MAC may vary the amount of
  60  * data by -1/+2. This struct is for reference only.
  61  */
  62 struct ath_ht20_fft_packet {
  63         u8 data[SPECTRAL_HT20_NUM_BINS];
  64         struct ath_ht20_mag_info mag_info;
  65         struct ath_radar_info radar_info;
  66 } __packed;
  67
  68 #define SPECTRAL_HT20_TOTAL_DATA_LEN    (sizeof(struct ath_ht20_fft_packet))
  69
  70 /* Dynamic 20/40 mode:
  71  *
  72  * [7:0]: lower bins {max_magnitude[1:0], bitmap_weight[5:0]}
  73  * [7:0]: lower bins  max_magnitude[9:2]
  74  * [7:0]: lower bins {max_index[5:0], max_magnitude[11:10]}
  75  * [7:0]: upper bins {max_magnitude[1:0], bitmap_weight[5:0]}
  76  * [7:0]: upper bins  max_magnitude[9:2]
  77  * [7:0]: upper bins {max_index[5:0], max_magnitude[11:10]}
  78  * [3:0]: max_exp (shift amount to size max bin to 8-bit unsigned)
  79  */
  80 struct ath_ht20_40_mag_info {
  81         u8 lower_bins[3];
  82         u8 upper_bins[3];
  83         u8 max_exp;
  84 } __packed;
  85
  86 /* WARNING: don't actually use this struct! MAC may vary the amount of
  87  * data. This struct is for reference only.
  88  */
  89 struct ath_ht20_40_fft_packet {
  90         u8 data[SPECTRAL_HT20_40_NUM_BINS];
  91         struct ath_ht20_40_mag_info mag_info;
  92         struct ath_radar_info radar_info;
  93 } __packed;
  94
  95 struct ath_spec_scan_priv {
  96         struct ath_hw *ah;
  97         /* relay(fs) channel for spectral scan */
  98         struct rchan *rfs_chan_spec_scan;
  99         enum spectral_mode spectral_mode;
 100         struct ath_spec_scan spec_config;
 101 };
 102
 103 #define SPECTRAL_HT20_40_TOTAL_DATA_LEN (sizeof(struct ath_ht20_40_fft_packet))
 104
 105 /* grabs the max magnitude from the all/upper/lower bins */
 106 static inline u16 spectral_max_magnitude(u8 *bins)
 107 {
 108         return (bins[0] & 0xc0) >> 6 |
 109                (bins[1] & 0xff) << 2 |
 110                (bins[2] & 0x03) << 10;
 111 }
 112
 113 /* return the max magnitude from the all/upper/lower bins */
 114 static inline u8 spectral_max_index(u8 *bins)
 115 {
 116         s8 m = (bins[2] & 0xfc) >> 2;
 117
 118         /* TODO: this still doesn't always report the right values ... */
 119         if (m > 32)
 120                 m |= 0xe0;
 121         else
 122                 m &= ~0xe0;
 123
 124         return m + 29;
 125 }
 126
 127 /* return the bitmap weight from the all/upper/lower bins */
 128 static inline u8 spectral_bitmap_weight(u8 *bins)
 129 {
 130         return bins[0] & 0x3f;
 131 }
 132
 133 void ath9k_cmn_spectral_init_debug(struct ath_spec_scan_priv *spec_priv, struct dentry *debugfs_phy);
 134 void ath9k_cmn_spectral_deinit_debug(struct ath_spec_scan_priv *spec_priv);
 135
 136 void ath9k_cmn_spectral_scan_trigger(struct ath_common *common,
 137                                  struct ath_spec_scan_priv *spec_priv);
 138 int ath9k_cmn_spectral_scan_config(struct ath_common *common,
 139                                struct ath_spec_scan_priv *spec_priv,
 140                                enum spectral_mode spectral_mode);
 141 int ath_cmn_process_fft(struct ath_spec_scan_priv *spec_priv, struct ieee80211_hdr *hdr,
 142                     struct ath_rx_status *rs, u64 tsf);
 143
 144 #endif /* SPECTRAL_H */