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ds2760_battery: handle full_active_uAh == 0 case correctly

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In systems where the battery monitor is not part of the battery pack and
is hence not bootstrapped with sane values, the full_active_uAh is
likely to be zero.

Handle that case by defaulting to the rated_capacity information which
can be passed to the driver using the new module parameter.

Signed-off-by: Daniel Mack <[email protected]>
Cc: Szabolcs Gyurko <[email protected]>
Acked-by: Matt Reimer <[email protected]>
Signed-off-by: Anton Vorontsov <[email protected]>
This commit is contained in:
Daniel Mack 2009-07-15 18:20:41 +02:00 • committed by Anton Vorontsov
commit 25f2bfa62a
1 changed files with 7 additions and 2 deletions
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9
drivers/power/ds2760_battery.c
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@ -172,8 +172,13 @@ static int ds2760_battery_read_status(struct ds2760_device_info *di)
di->full_active_uAh = di->raw[DS2760_ACTIVE_FULL] << 8 |
di->raw[DS2760_ACTIVE_FULL + 1];
scale[0] = di->raw[DS2760_ACTIVE_FULL] << 8 |
di->raw[DS2760_ACTIVE_FULL + 1];
/* If the full_active_uAh value is not given, fall back to the rated
* capacity. This is likely to happen when chips are not part of the
* battery pack and is therefore not bootstrapped. */
if (di->full_active_uAh == 0)
di->full_active_uAh = di->rated_capacity / 1000L;
scale[0] = di->full_active_uAh;
for (i = 1; i < 5; i++)
scale[i] = scale[i - 1] + di->raw[DS2760_ACTIVE_FULL + 2 + i];