On 11/1/06, Henrique de Moraes Holschuh <[email protected]> wrote:
On Wed, 01 Nov 2006, David Woodhouse wrote:
> On Wed, 2006-11-01 at 13:26 +0000, Richard Hughes wrote:
> > With the battery class driver, how would that be conveyed? Would the
> > sysfs file be deleted in this case, or would the value of the sysfs
> > key be something like "<invalid>".
>
> I'd be inclined to make the read return -EINVAL.
-EIO for transient errors (e.g. access to the embedded controller/battery
charger/whatever fails at that instant), -EINVAL for "not supported"
(missing ACPI method, attribute not supported in the specific hardware)?
Shouldn't it be -EIO or -EBUSY for transient errors (depending on
type), and -ENXIO when not provided by hardware?
The -EINVAL is more appropriate for bad user-supplied values (out of
range etc.) to writable attributes.
Shem
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