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authorlme00437 <benoit.gauthier-nonst@stericsson.com>2012-12-12 10:07:50 +0100
committerLee Jones <lee.jones@linaro.org>2013-03-07 12:35:59 +0800
commit0577610e0e6b431a1503cc5d78e8178e0dd59948 (patch)
tree6c95a09b1edca2dea1a203bbc665a387dbe744dc /drivers/power
parent4d3b4aa58ac9e18029c4d0259630414cffd3ba76 (diff)
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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>
Diffstat (limited to 'drivers/power')
-rw-r--r--drivers/power/ab8500_fg.c8
1 files changed, 4 insertions, 4 deletions
diff --git a/drivers/power/ab8500_fg.c b/drivers/power/ab8500_fg.c
index adc02004e7a3..1601d27ce5d4 100644
--- a/drivers/power/ab8500_fg.c
+++ b/drivers/power/ab8500_fg.c
@@ -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);