fat_fs: Expose _VOLUMES to Kconfig

Expose _VOLUMES as CONFIG_FS_FATFS_VOLUMES to Kconfig to be able to
adjust the number of used logical drives.

Signed-off-by: Markus Fuchs <[email protected]>

Author: mrfuchs

README

@@ -22,3 +22,4 @@ _MAX_LFN	as	CONFIG_FS_FATFS_MAX_LFN
 _CODE_PAGE	as	CONFIG_FS_FATFS_CODEPAGE
 _FS_READONLY	as	CONFIG_FS_FATFS_READ_ONLY
 _USE_MKFS	as	CONFIG_FS_FATFS_MKFS
+_VOLUMES	as	CONFIG_FS_FATFS_VOLUMES

include/ffconf.h

@@ -174,7 +174,11 @@
 / Drive/Volume Configurations
 /---------------------------------------------------------------------------*/
 
+#if defined(CONFIG_FS_FATFS_VOLUMES)
+#define _VOLUMES	CONFIG_FS_FATFS_VOLUMES
+#else
 #define _VOLUMES	8
+#endif
 /* Number of volumes (logical drives) to be used. */