Introduce volume_{present,removable} and fix invalid calls in apps/

The code was trying to probe for volume presence by calling drive layer
with volume index. It is a miracle it get unnoticed so far. Introduce
proper volume probing using the vol->drive map in the disk layer.

Change-Id: I463a5bcc8170f007cad049536094207d2ba3c6fc
Reviewed-on: http://gerrit.rockbox.org/669
Reviewed-by: Amaury Pouly <amaury.pouly@gmail.com>

1 files changed, 5 insertions, 0 deletions

diff --git a/firmware/export/disk.h b/firmware/export/disk.h
index 8d6b41b5bd..b97ec11039 100644
--- a/firmware/export/disk.h
+++ b/firmware/export/disk.h
@@ -50,4 +50,9 @@ int disk_unmount(int drive);
 int disk_get_sector_multiplier(IF_MD_NONVOID(int drive));
 #endif
 
+#ifdef HAVE_HOTSWAP
+bool volume_removable(int volume);
+bool volume_present(int volume);
+#endif
+
 #endif