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rrm: remove use of floating point math

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The RCPI value was using floating point values as per the spec. But instead
we can just use the signal strength coming from the kernel in mili mdm and
scale the hard coded values by a factor of 100.
This commit is contained in:
James Prestwood 2019-11-18 10:35:54 -08:00 committed by Denis Kenzior
parent be4ab2826f
commit c1c2ca5e7f
1 changed files with 3 additions and 5 deletions
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8
src/rrm.c
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@ -25,7 +25,6 @@
#endif
#include <stdint.h>
#include <math.h>
#include <linux/if_ether.h>
#include <ell/ell.h>
@ -247,7 +246,6 @@ static size_t build_report_for_bss(struct rrm_beacon_req_info *beacon,
uint8_t *to)
{
uint8_t *start = to;
double dbms = bss->signal_strength / 100;
*to++ = beacon->oper_class;
*to++ = scan_freq_to_channel(bss->frequency, NULL);
@ -259,10 +257,10 @@ static size_t build_report_for_bss(struct rrm_beacon_req_info *beacon,
*to++ = rrm_phy_type(bss);
/* 802.11 Table 9-154 - RCPI values */
if (dbms < -109.5)
if (bss->signal_strength < -10950)
*to++ = 0;
else if (dbms >= -109.5 && dbms < 0)
*to++ = (uint8_t)floor(2 * (dbms + 110));
else if (bss->signal_strength >= -10950 && bss->signal_strength < 0)
*to++ = (uint8_t)((2 * (bss->signal_strength + 11000)) / 100);
else
*to++ = 220;