diff options
| author | Lars Ericsson <Lars_Ericsson@telia.com> | 2009-08-08 23:54:51 +0200 |
|---|---|---|
| committer | John W. Linville <linville@tuxdriver.com> | 2009-08-14 09:13:52 -0400 |
| commit | 66679a65efffffb62dc2650960b3aff758d575f9 (patch) | |
| tree | 75f3f323331e89fd7c4a8cc87339cceb1959037b /drivers/net/wireless/rt2x00/rt2x00.h | |
| parent | 193df183b15cda78f6b2373f576e243327ea0d8f (diff) | |
rt2x00: Fix rounding errors in RSSI average calculation
Small changes in signal level was not detected up by the
MOVING_AVERAGE() due to a rounding error, using 'int' type.
rt2x00lib_antenna_diversity_eval:
rssi: -62 -62 -62 -62 -62 -62 -62 -62 -62 -62 -62 -62 -62 -62 -62
rssi_avg: -57 -57 -57 -57 -57 -57 -57 -57 -57 -57 -57 -57 -57 -57 -57
The signal level reported back could be significantly (5dBm)
different from the actual value. A level +3dBm is the same as
double the AP output power.
Signed-off-by: Lars Ericsson <Lars_Ericsson@telia.com>
Signed-off-by: Ivo van Doorn <IvDoorn@gmail.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
Diffstat (limited to 'drivers/net/wireless/rt2x00/rt2x00.h')
| -rw-r--r-- | drivers/net/wireless/rt2x00/rt2x00.h | 15 |
1 files changed, 13 insertions, 2 deletions
diff --git a/drivers/net/wireless/rt2x00/rt2x00.h b/drivers/net/wireless/rt2x00/rt2x00.h index 704e94474b1d..e6e73be31e37 100644 --- a/drivers/net/wireless/rt2x00/rt2x00.h +++ b/drivers/net/wireless/rt2x00/rt2x00.h @@ -134,6 +134,17 @@ GET_DURATION(IEEE80211_HEADER + ACK_SIZE, 10) ) /* + * Structure for average calculation + * The avg field contains the actual average value, + * but avg_weight is internally used during calculations + * to prevent rounding errors. + */ +struct avg_val { + int avg; + int avg_weight; +}; + +/* * Chipset identification * The chipset on the device is composed of a RT and RF chip. * The chipset combination is important for determining device capabilities. @@ -256,7 +267,7 @@ struct link_ant { * Similar to the avg_rssi in the link_qual structure * this value is updated by using the walking average. */ - int rssi_ant; + struct avg_val rssi_ant; }; /* @@ -285,7 +296,7 @@ struct link { /* * Currently active average RSSI value */ - int avg_rssi; + struct avg_val avg_rssi; /* * Currently precalculated percentages of successful |