v4l2: v4l2_camera_proxy: Use file description in debug messages

Debug messages in V4L2CameraProxy print the numerical file descriptor,
which isn't very human-friendly. Replace it with the V4L2CameraFile
description that includes the full path. While at it, refactor the
messages to use __func__ instead of manually copying function names.

Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Reviewed-by: Kieran Bingham <kieran.bingham@ideasonboard.com>
Reviewed-by: Paul Elder <paul.elder@ideasonboard.com>

src/v4l2/v4l2_compat_manager.cpp

@@ -194,7 +194,8 @@ void *V4L2CompatManager::mmap(void *addr, size_t length, int prot, int flags,
 	if (!file)
 		return fops_.mmap(addr, length, prot, flags, fd, offset);
 
-	void *map = file->proxy()->mmap(addr, length, prot, flags, offset);
+	void *map = file->proxy()->mmap(file.get(), addr, length, prot, flags,
+					offset);
 	if (map == MAP_FAILED)
 		return map;
 
@@ -210,7 +211,7 @@ int V4L2CompatManager::munmap(void *addr, size_t length)
 
 	V4L2CameraFile *file = device->second.get();
 
-	int ret = file->proxy()->munmap(addr, length);
+	int ret = file->proxy()->munmap(file, addr, length);
 	if (ret < 0)
 		return ret;