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>

diff --git a/drivers/power/ab8500_fg.c b/drivers/power/ab8500_fg.c
index adc0200..1601d27 100644 (file)
--- 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);