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author | John W. Linville <linville@tuxdriver.com> | 2009-12-30 15:25:08 -0500 |
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committer | John W. Linville <linville@tuxdriver.com> | 2009-12-30 15:25:08 -0500 |
commit | 891dc5e73783eeabd2a704a9425e2a199b39c9f9 (patch) | |
tree | 9b4478941c486d47a71bfce455b896c5dda7e811 /drivers/net/wireless/iwlwifi/iwl3945-base.c | |
parent | e1781ed33a8809c58ad6c3b6d432d656446efa43 (diff) | |
parent | 55afc80b2ab100618c17af77915f75307b6bd5d1 (diff) | |
download | linux-891dc5e73783eeabd2a704a9425e2a199b39c9f9.tar.bz2 |
Merge git://git.kernel.org/pub/scm/linux/kernel/git/linville/wireless-2.6
Conflicts:
drivers/net/wireless/libertas/scan.c
Diffstat (limited to 'drivers/net/wireless/iwlwifi/iwl3945-base.c')
-rw-r--r-- | drivers/net/wireless/iwlwifi/iwl3945-base.c | 41 |
1 files changed, 0 insertions, 41 deletions
diff --git a/drivers/net/wireless/iwlwifi/iwl3945-base.c b/drivers/net/wireless/iwlwifi/iwl3945-base.c index 6533122ed87a..10b0aa8024c4 100644 --- a/drivers/net/wireless/iwlwifi/iwl3945-base.c +++ b/drivers/net/wireless/iwlwifi/iwl3945-base.c @@ -1299,47 +1299,6 @@ int iwl3945_calc_db_from_ratio(int sig_ratio) return (int)ratio2dB[sig_ratio]; } -#define PERFECT_RSSI (-20) /* dBm */ -#define WORST_RSSI (-95) /* dBm */ -#define RSSI_RANGE (PERFECT_RSSI - WORST_RSSI) - -/* Calculate an indication of rx signal quality (a percentage, not dBm!). - * See http://www.ces.clemson.edu/linux/signal_quality.shtml for info - * about formulas used below. */ -int iwl3945_calc_sig_qual(int rssi_dbm, int noise_dbm) -{ - int sig_qual; - int degradation = PERFECT_RSSI - rssi_dbm; - - /* If we get a noise measurement, use signal-to-noise ratio (SNR) - * as indicator; formula is (signal dbm - noise dbm). - * SNR at or above 40 is a great signal (100%). - * Below that, scale to fit SNR of 0 - 40 dB within 0 - 100% indicator. - * Weakest usable signal is usually 10 - 15 dB SNR. */ - if (noise_dbm) { - if (rssi_dbm - noise_dbm >= 40) - return 100; - else if (rssi_dbm < noise_dbm) - return 0; - sig_qual = ((rssi_dbm - noise_dbm) * 5) / 2; - - /* Else use just the signal level. - * This formula is a least squares fit of data points collected and - * compared with a reference system that had a percentage (%) display - * for signal quality. */ - } else - sig_qual = (100 * (RSSI_RANGE * RSSI_RANGE) - degradation * - (15 * RSSI_RANGE + 62 * degradation)) / - (RSSI_RANGE * RSSI_RANGE); - - if (sig_qual > 100) - sig_qual = 100; - else if (sig_qual < 1) - sig_qual = 0; - - return sig_qual; -} - /** * iwl3945_rx_handle - Main entry function for receiving responses from uCode * |