diff --git a/telethon/utils.py b/telethon/utils.py
index 60e4c990..4f98fbc3 100644
--- a/telethon/utils.py
+++ b/telethon/utils.py
@@ -270,9 +270,41 @@ def get_input_photo(photo):
     if isinstance(photo, types.PhotoEmpty):
         return types.InputPhotoEmpty()
 
+    if isinstance(photo, types.messages.ChatFull):
+        photo = photo.full_chat
+    if isinstance(photo, types.ChannelFull):
+        return get_input_photo(photo.chat_photo)
+    elif isinstance(photo, types.UserFull):
+        return get_input_photo(photo.profile_photo)
+    elif isinstance(photo, (types.Channel, types.Chat, types.User)):
+        return get_input_photo(photo.photo)
+
+    if isinstance(photo, (types.UserEmpty, types.ChatEmpty,
+                          types.ChatForbidden, types.ChannelForbidden)):
+        return types.InputPhotoEmpty()
+
     _raise_cast_fail(photo, 'InputPhoto')
 
 
+def get_input_chat_photo(photo):
+    """Similar to :meth:`get_input_peer`, but for chat photos"""
+    try:
+        if photo.SUBCLASS_OF_ID == 0xd4eb2d74:  # crc32(b'InputChatPhoto')
+            return photo
+        elif photo.SUBCLASS_OF_ID == 0xe7655f1f:  # crc32(b'InputFile'):
+            return types.InputChatUploadedPhoto(photo)
+    except AttributeError:
+        _raise_cast_fail(photo, 'InputChatPhoto')
+
+    photo = get_input_photo(photo)
+    if isinstance(photo, types.InputPhoto):
+        return types.InputChatPhoto(photo)
+    elif isinstance(photo, types.InputPhotoEmpty):
+        return types.InputChatPhotoEmpty()
+
+    _raise_cast_fail(photo, 'InputChatPhoto')
+
+
 def get_input_geo(geo):
     """Similar to :meth:`get_input_peer`, but for geo points"""
     try:
diff --git a/telethon_generator/generators/tlobject.py b/telethon_generator/generators/tlobject.py
index ee31defb..0bcd983d 100644
--- a/telethon_generator/generators/tlobject.py
+++ b/telethon_generator/generators/tlobject.py
@@ -25,7 +25,9 @@ AUTO_CASTS = {
     'InputNotifyPeer': 'await client._get_input_notify({})',
     'InputMedia': 'utils.get_input_media({})',
     'InputPhoto': 'utils.get_input_photo({})',
-    'InputMessage': 'utils.get_input_message({})'
+    'InputMessage': 'utils.get_input_message({})',
+    'InputDocument': 'utils.get_input_document({})',
+    'InputChatPhoto': 'utils.get_input_chat_photo({})',
 }
 
 NAMED_AUTO_CASTS = {