2 files changed, 34 insertions, 0 deletions
diff --git a/hw/usb/host-libusb.c b/hw/usb/host-libusb.c
index bd81d71..7791c6d 100644
--- a/hw/usb/host-libusb.c
+++ b/hw/usb/host-libusb.c
@@ -1707,6 +1707,35 @@ static void usb_host_auto_check(void *unused)
     timer_mod(usb_auto_timer, qemu_clock_get_ms(QEMU_CLOCK_REALTIME) + 2000);
 }
 
+/**
+ * Check whether USB host device has a USB mass storage SCSI interface
+ */
+bool usb_host_dev_is_scsi_storage(USBDevice *ud)
+{
+    USBHostDevice *uhd = USB_HOST_DEVICE(ud);
+    struct libusb_config_descriptor *conf;
+    const struct libusb_interface_descriptor *intf;
+    bool is_scsi_storage = false;
+    int i;
+
+    if (!uhd || libusb_get_active_config_descriptor(uhd->dev, &conf) != 0) {
+        return false;
+    }
+
+    for (i = 0; i < conf->bNumInterfaces; i++) {
+        intf = &conf->interface[i].altsetting[ud->altsetting[i]];
+        if (intf->bInterfaceClass == LIBUSB_CLASS_MASS_STORAGE &&
+            intf->bInterfaceSubClass == 6) {                 /* 6 means SCSI */
+            is_scsi_storage = true;
+            break;
+        }
+    }
+
+    libusb_free_config_descriptor(conf);
+
+    return is_scsi_storage;
+}
+
 void hmp_info_usbhost(Monitor *mon, const QDict *qdict)
 {
     libusb_device **devs = NULL;
diff --git a/hw/usb/host-stub.c b/hw/usb/host-stub.c
index 6ba65a1..d0268ba 100644
--- a/hw/usb/host-stub.c
+++ b/hw/usb/host-stub.c
@@ -46,3 +46,8 @@ USBDevice *usb_host_device_open(USBBus *bus, const char *devname)
 {
     return NULL;
 }
+
+bool usb_host_dev_is_scsi_storage(USBDevice *ud)
+{
+    return false;
+}