On Wednesday, April 13, 2016 08:48:14 AM Betty Dall wrote: > The ACPI _HRV object on the device is used to supply Linux with > the device's hardware revision. This is an optional object. Add > sysfs support for the _HRV object if it exists on the device. > > Signed-off-by: Betty Dall <[email protected]> > --- > drivers/acpi/device_sysfs.c | 24 ++++++++++++++++++++++++ > 1 file changed, 24 insertions(+) > > diff --git a/drivers/acpi/device_sysfs.c b/drivers/acpi/device_sysfs.c > index b9afb47..bf12dbe 100644 > --- a/drivers/acpi/device_sysfs.c > +++ b/drivers/acpi/device_sysfs.c > @@ -473,6 +473,21 @@ acpi_device_sun_show(struct device *dev, struct > device_attribute *attr, > } > static DEVICE_ATTR(sun, 0444, acpi_device_sun_show, NULL); > > +static ssize_t > +acpi_device_hrv_show(struct device *dev, struct device_attribute *attr, > + char *buf) { > + struct acpi_device *acpi_dev = to_acpi_device(dev); > + acpi_status status; > + unsigned long long hrv; > + > + status = acpi_evaluate_integer(acpi_dev->handle, "_HRV", NULL, &hrv); > + if (ACPI_FAILURE(status)) > + return -ENODEV;
Actually, this should be -EIO I think. Thanks, Rafael
