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Commit 0577610e authored by lme00437's avatar lme00437 Committed by Lee Jones
Browse files

ab8500-fg: Change current calculation 



This patch updates the gas gauge constant for electric current
calculation according to hardware specification.

Signed-off-by: default avatarBenoit GAUTHIER <benoit.gauthier-xsig@stericsson.com>
Signed-off-by: default avatarLee Jones <lee.jones@linaro.org>
Reviewed-by: default avatarMarcus COOPER <marcus.xm.cooper@stericsson.com>
Reviewed-by: default avatarPhilippe LANGLAIS <philippe.langlais@stericsson.com>
Tested-by: default avatarBenoit GAUTHIER <benoit.gauthier-xsig@stericsson.com>
parent 4d3b4aa5

drivers/power/ab8500_fg.c

+4 −4
Original line number Diff line number Diff line
@@ -36,7 +36,7 @@ 


#define MILLI_TO_MICRO			1000

#define FG_LSB_IN_MA			1627

#define QLSB_NANO_AMP_HOURS_X10		1129

#define QLSB_NANO_AMP_HOURS_X10		1071

#define INS_CURR_TIMEOUT		(3 * HZ)



#define SEC_TO_SAMPLE(S)		(S * 4)
@@ -672,11 +672,11 @@ int ab8500_fg_inst_curr_finalize(struct ab8500_fg *di, int *res) 
	/*

	 * Convert to unit value in mA

	 * Full scale input voltage is

	 * 66.660mV => LSB = 66.660mV/(4096*res) = 1.627mA

	 * 63.160mV => LSB = 63.160mV/(4096*res) = 1.542mA

	 * Given a 250ms conversion cycle time the LSB corresponds

	 * to 112.9 nAh. Convert to current by dividing by the conversion

	 * to 107.1 nAh. Convert to current by dividing by the conversion

	 * time in hours (250ms = 1 / (3600 * 4)h)

	 * 112.9nAh assumes 10mOhm, but fg_res is in 0.1mOhm

	 * 107.1nAh assumes 10mOhm, but fg_res is in 0.1mOhm

	 */

	val = (val * QLSB_NANO_AMP_HOURS_X10 * 36 * 4) /

		(1000 * di->bm->fg_res);