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power_supply_sysfs: Handle -ENODATA in a special way 

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>
hifive-unleashed-5.1
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;