USB device-mode support (#613)

TactilityKernel/source/drivers/usb_msc_device.cpp

@@ -0,0 +1,32 @@
+#include <tactility/drivers/usb_msc_device.h>
+#include <tactility/device.h>
+#include <tactility/driver.h>
+
+#define USB_MSC_DEVICE_API(device) ((const struct UsbMscDeviceApi*)device_get_driver(device)->api)
+
+extern "C" {
+
+const struct DeviceType USB_MSC_DEVICE_TYPE = {
+    .name = "usb-msc-device",
+};
+
+struct Device* usb_msc_device_get() {
+    struct Device* found = nullptr;
+    device_get_first_active_by_type(&USB_MSC_DEVICE_TYPE, &found);
+    return found;
+}
+
+error_t usb_msc_device_start(struct Device* device, enum UsbMscDeviceSource source, void* source_handle,
+                             UsbMscDeviceMountChangedCallback mount_changed_cb, void* context) {
+    return USB_MSC_DEVICE_API(device)->start(device, source, source_handle, mount_changed_cb, context);
+}
+
+error_t usb_msc_device_stop(struct Device* device) {
+    return USB_MSC_DEVICE_API(device)->stop(device);
+}
+
+bool usb_msc_device_is_connected(struct Device* device) {
+    return USB_MSC_DEVICE_API(device)->is_connected(device);
+}
+
+} // extern "C"