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Message-Id: <1357909986-9262-18-git-send-email-lee.jones@linaro.org> Date: Fri, 11 Jan 2013 13:13:05 +0000 From: Lee Jones <lee.jones@...aro.org> To: linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org Cc: arnd@...db.de, linus.walleij@...ricsson.com, cbouatmailru@...il.com, Paer-Olof Haakansson <par-olof.hakansson@...ricsson.com>, Lee Jones <lee.jones@...aro.org>, Henrik Sölver <henrik.solver@...ricsson.com> Subject: [PATCH 17/18] Power: ab8500_fg: Overflow in current calculation From: Paer-Olof Haakansson <par-olof.hakansson@...ricsson.com> When calculating the average current the nominator will overflow when the charging current is high. Signed-off-by: Lee Jones <lee.jones@...aro.org> Signed-off-by: Henrik Sölver <henrik.solver@...ricsson.com> Reviewed-by: Par-Olof HAKANSSON <par-olof.hakansson@...ricsson.com> Reviewed-by: Jonas ABERG <jonas.aberg@...ricsson.com> Tested-by: Par-Olof HAKANSSON <par-olof.hakansson@...ricsson.com> --- drivers/power/ab8500_fg.c | 9 ++++----- 1 file changed, 4 insertions(+), 5 deletions(-) diff --git a/drivers/power/ab8500_fg.c b/drivers/power/ab8500_fg.c index 845e64f..4bc2c2d 100644 --- a/drivers/power/ab8500_fg.c +++ b/drivers/power/ab8500_fg.c @@ -805,12 +805,9 @@ static void ab8500_fg_acc_cur_work(struct work_struct *work) /* * Convert to unit value in mA - * Full scale input voltage is - * 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 + * by dividing by the conversion * 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) / (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); + 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; exit: dev_err(di->dev, -- 1.7.9.5 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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