ds2760_battery: Fix integer overflow for time_to_empty_now
On the device we're currently developing, battery sizes of ~2.8Ah and current flow of ~600mA are typical. With that values, the life_sec computation overflows due to the multiplication by 3600. Signed-off-by: Daniel Mack <daniel@caiaq.de> Cc: Szabolcs Gyurko <szabolcs.gyurko@tlt.hu> Cc: Matt Reimer <mreimer@vpop.net> Signed-off-by: Anton Vorontsov <avorontsov@ru.mvista.com>
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@ -211,9 +211,9 @@ static int ds2760_battery_read_status(struct ds2760_device_info *di)
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if (di->rem_capacity > 100)
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di->rem_capacity = 100;
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if (di->current_uA)
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di->life_sec = -((di->accum_current_uAh - di->empty_uAh) *
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3600L) / di->current_uA;
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if (di->current_uA >= 100L)
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di->life_sec = -((di->accum_current_uAh - di->empty_uAh) * 36L)
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/ (di->current_uA / 100L);
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else
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di->life_sec = 0;
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