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ab8500_fg: Overflow in current calculation

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When calculating the average current the nominator will
overflow when the charging current is high.

Signed-off-by: Lee Jones <lee.jones@linaro.org>
Signed-off-by: Henrik Sölver <henrik.solver@stericsson.com>
Reviewed-by: Par-Olof HAKANSSON <par-olof.hakansson@stericsson.com>
Reviewed-by: Jonas ABERG <jonas.aberg@stericsson.com>
Tested-by: Par-Olof HAKANSSON <par-olof.hakansson@stericsson.com>
Signed-off-by: Anton Vorontsov <anton@enomsg.org>
This commit is contained in:
Paer-Olof Haakansson 2013-01-11 13:13:05 +00:00 • committed by Anton Vorontsov
parent 4b45f4a9cd
commit f902dadc12
1 changed files with 4 additions and 5 deletions
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9
drivers/power/ab8500_fg.c
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@ -805,12 +805,9 @@ static void ab8500_fg_acc_cur_work(struct work_struct *work)
/* /*
* Convert to unit value in mA * Convert to unit value in mA
* Full scale input voltage is * by dividing by the conversion
* 66.660mV => LSB = 66.660mV/(4096*res) = 1.627mA
* Given a 250ms conversion cycle time the LSB corresponds
* to 112.9 nAh. Convert to current by dividing by the conversion
* time in hours (= samples / (3600 * 4)h) * time in hours (= samples / (3600 * 4)h)
* 112.9nAh assumes 10mOhm, but fg_res is in 0.1mOhm * and multiply with 1000
*/ */
di->avg_curr = (val * QLSB_NANO_AMP_HOURS_X10 * 36) / di->avg_curr = (val * QLSB_NANO_AMP_HOURS_X10 * 36) /
(1000 * di->bm->fg_res * (di->fg_samples / 4)); (1000 * di->bm->fg_res * (di->fg_samples / 4));
@ -821,6 +818,8 @@ static void ab8500_fg_acc_cur_work(struct work_struct *work)
queue_work(di->fg_wq, &di->fg_work); queue_work(di->fg_wq, &di->fg_work);
dev_dbg(di->dev, "fg_res: %d, fg_samples: %d, gasg: %d, accu_charge: %d \n",
di->bm->fg_res, di->fg_samples, val, di->accu_charge);
return; return;
exit: exit:
dev_err(di->dev, dev_err(di->dev,