On Wed, Aug 09, 2017 at 01:15:42AM -0700, Ronald Tschalär wrote: > The keyboard and touchpad on MacBook's from 2015 onwards are connected > via an SPI bus. On MacBook8's (2015) the ACPI device for the SPI master > for this bus has _CID "INT33C1", and hence the acpi-lpss handler here is > triggered for it. However, the DSDT lists no memory resources for this > device, resulting in an error being returned by the attach callback and > therefore the SPI master device being ignored. This prevents us from > being able to register the keyboard and touchpad driver. > > Furthermore, the controller (a Wildcat Point-LP controller) does not > appear to need the functionality provided by the apci-lpss handler. > Therefore we now just skip the handler if no memory resources are found > and let the ACPI scan complete successfully for this device. > > All of this is not an issue on later MacBook(Pro)'s because their ACPI > SPI devices don't have any _CID and therefore no attempt is made to attach > this handler. > > Returning an error was introduced in commit d3e13ff3c1aa - this restores > the original behaviour. > > Link: https://github.com/cb22/macbook12-spi-driver > Signed-off-by: Ronald Tschalär <ronald@xxxxxxxxxxxxx> Acked-by: Mika Westerberg <mika.westerberg@xxxxxxxxxxxxxxx> -- To unsubscribe from this list: send the line "unsubscribe linux-acpi" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
