action save_post not firing on create post

save_post hook

I’m writin a plugin which uses custom post types and I’ve added

add_action('admin_init','ddb_custom_post_format_admin');

function ddb_custom_post_format_admin() {
add_action('save_post', 'ddb_save_data');

………

then

function ddb_save_data($post_id) {
// try echoing to see what we have
	echo 'ddb_save_data-post type=' . get_post_type();

…….

This works perfectly if I am editing but it doesn’t seem to fire at all when adding from the “Add new” menu item of the custom post type.
The new post of custom post type saves and can be edited OK
but how can I hook into the save_post of a new post?
I want to hook into it straight after it has saved so I can do other processing.

Am I adding the action in the right place?