fs: fatfs: additional ELM FAT options

Make additional ELM FAT library options configurable to the user.

Signed-off-by: Jordan Yates <jordan@embeint.com>

modules/fatfs/zephyr_fatfs_config.h

@@ -89,7 +89,11 @@
 #define FF_FS_TINY 1
 
 #undef FF_FS_NORTC
+#if defined(CONFIG_FS_FATFS_HAS_RTC)
+#define FF_FS_NORTC 0
+#else
 #define FF_FS_NORTC 1
+#endif /* defined(CONFIG_FS_FATFS_HAS_RTC) */
 
 /* Zephyr uses FF_VOLUME_STRS */
 #undef FF_STR_VOLUME_ID
@@ -104,6 +108,15 @@
 #undef FF_VOLUMES
 #define FF_VOLUMES 8
 
+#if defined(CONFIG_FS_FATFS_EXTRA_NATIVE_API)
+#undef FF_USE_LABEL
+#undef FF_USE_EXPAND
+#undef FF_USE_FIND
+#define FF_USE_LABEL 1
+#define FF_USE_EXPAND 1
+#define FF_USE_FIND 1
+#endif /* defined(CONFIG_FS_FATFS_EXTRA_NATIVE_API) */
+
 /*
  * Options provided below have been added to ELM FAT source code to
  * support Zephyr specific features, and are not part of ffconf.h.

subsys/fs/Kconfig.fatfs

@@ -89,6 +89,30 @@ config FS_FATFS_NUM_DIRS
 	  at compile-time.
 	  This affects use of fs_opendir on FAT type mounted file systems.
 
+config FS_FATFS_HAS_RTC
+	bool "Timestamping support"
+	help
+	  Enable file system timestamping instead of using a hardcoded date
+	  for all operations. Requires an application supplied implementation
+	  of `get_fattime`. Format of the uint32_t bits are as follows:
+	    31:25 = Year from 1980
+	    24:21 = Month (1..12)
+	    20:16 = Day of month (1..31)
+	    15:11 = Hour (0..23)
+	    10: 5 = Minute (0..59)
+	     4: 0 = Seconds/2 (0..29)
+
+config FS_FATFS_EXTRA_NATIVE_API
+	bool "Additional native API functions"
+	help
+	  Enable the following additional native API functions that do not have
+	  an equivalent in the Zephyr VFS API:
+	   * `f_getlabel`
+	   * `f_setlabel`
+	   * `f_expand`
+	   * `f_findfirst`
+	   * `f_findnext`
+
 config FS_FATFS_LFN
 	bool "Long filenames (LFN)"
 	help