am7xxx: detect unexpected responses to AM7XXX_PACKET_TYPE_DEVINFO requests

[libam7xxx.git] / src / am7xxx.c

diff --git a/src/am7xxx.c b/src/am7xxx.c
index c039147..bc671f1 100644 (file)
--- a/src/am7xxx.c
+++ b/src/am7xxx.c
@@ -390,7 +390,8 @@ static int read_header(am7xxx_device *dev, struct am7xxx_header *h)
                ret = 0;
        } else {
                error(dev->ctx,
-                     "Received a packet with direction AM7XXX_DIRECTION_OUT, weird!\n");
+                     "Expected an AM7XXX_DIRECTION_IN packet, got one with direction = %d. Weird!\n",
+                     h->direction);
                ret = -EINVAL;
        }
 
@@ -751,6 +752,13 @@ AM7XXX_PUBLIC int am7xxx_get_device_info(am7xxx_device *dev,
        if (ret < 0)
                return ret;
 
+       if (h.packet_type != AM7XXX_PACKET_TYPE_DEVINFO) {
+               error(dev->ctx, "expected packet type: %d, got %d instead!\n",
+                     AM7XXX_PACKET_TYPE_DEVINFO, h.packet_type);
+               errno = ENOTSUP;
+               return -ENOTSUP;
+       }
+
        device_info->native_width = h.header_data.devinfo.native_width;
        device_info->native_height = h.header_data.devinfo.native_height;
 #if 0