forked from Minki/linux
ab8500-fg: Change current calculation
This patch updates the gas gauge constant for electric current calculation according to hardware specification. Signed-off-by: Benoit GAUTHIER <benoit.gauthier-xsig@stericsson.com> Signed-off-by: Lee Jones <lee.jones@linaro.org> Reviewed-by: Marcus COOPER <marcus.xm.cooper@stericsson.com> Reviewed-by: Philippe LANGLAIS <philippe.langlais@stericsson.com> Tested-by: Benoit GAUTHIER <benoit.gauthier-xsig@stericsson.com>
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@ -36,7 +36,7 @@
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#define MILLI_TO_MICRO 1000
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#define FG_LSB_IN_MA 1627
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#define QLSB_NANO_AMP_HOURS_X10 1129
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#define QLSB_NANO_AMP_HOURS_X10 1071
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#define INS_CURR_TIMEOUT (3 * HZ)
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#define SEC_TO_SAMPLE(S) (S * 4)
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@ -672,11 +672,11 @@ int ab8500_fg_inst_curr_finalize(struct ab8500_fg *di, int *res)
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/*
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* Convert to unit value in mA
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* Full scale input voltage is
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* 66.660mV => LSB = 66.660mV/(4096*res) = 1.627mA
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* 63.160mV => LSB = 63.160mV/(4096*res) = 1.542mA
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* Given a 250ms conversion cycle time the LSB corresponds
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* to 112.9 nAh. Convert to current by dividing by the conversion
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* to 107.1 nAh. Convert to current by dividing by the conversion
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* time in hours (250ms = 1 / (3600 * 4)h)
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* 112.9nAh assumes 10mOhm, but fg_res is in 0.1mOhm
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* 107.1nAh assumes 10mOhm, but fg_res is in 0.1mOhm
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*/
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val = (val * QLSB_NANO_AMP_HOURS_X10 * 36 * 4) /
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(1000 * di->bm->fg_res);
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