For virtio-based device, it needs to use virtio_base as the first member
otherwise, virtio_linkup will fail.
Tracked-On: #2512
Signed-off-by: Yuan Liu <yuan1.liu@intel.com>
Acked-by: Yu Wang <yu1.wang@intel.com>
When the backend completes a GPIO request, it returns a valid length
to ensure that response correct.
Tracked-On: #2512
Signed-off-by: Yuan Liu <yuan1.liu@intel.com>
Acked-by: Yu Wang <yu1.wang@intel.com>
if the gpio debug is enabled, print gpio mapping information about
virtual gpio and native gpio, also print virtio-gpio data, which shows
the gpio operations flow.
Tracked-On: #2512
Signed-off-by: Yuan Liu <yuan1.liu@intel.com>
Acked-by: Yu Wang <yu1.wang@intel.com>
Implement gpio set/get value, direction input/output and set config operations.
Tracked-On: #2512
Signed-off-by: Yuan Liu <yuan1.liu@intel.com>
Acked-by: Yu Wang <yu1.wang@intel.com>
virtio framework implementation for virtio-based gpio virtualization.
virtio-based gpio uses one virtqueue to implement gpio operaions and
frontend gpio chip base and number are provided by virtio config.
Tracked-On: #2512
Signed-off-by: Yuan Liu <yuan1.liu@intel.com>
Acked-by: Yu Wang <yu1.wang@intel.com>
