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power_supply_sysfs: Handle -ENODATA in a special way

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There are cases when some device can not report any meaningful value,
e.g. TWL4030 charger can report voltage only when charging is
active.

In these cases drivers will return -ENODATA, and we shouldn't flood
kernel log with error messages.

Signed-off-by: Anton Vorontsov <avorontsov@ru.mvista.com>
This commit is contained in:
Anton Vorontsov 2009-12-03 00:24:51 +03:00
parent 0e19dbb73e
commit 9d233e8bb9
1 changed files with 4 additions and 1 deletions
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5
drivers/power/power_supply_sysfs.c
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@ -65,7 +65,10 @@ static ssize_t power_supply_show_property(struct device *dev,
ret = psy->get_property(psy, off, &value);
if (ret < 0) {
if (ret != -ENODEV)
if (ret == -ENODATA)
dev_dbg(dev, "driver has no data for `%s' property\n",
attr->attr.name);
else if (ret != -ENODEV)
dev_err(dev, "driver failed to report `%s' property\n",
attr->attr.name);
return ret;