add user data to lv_fs_drv_t

lv_conf_template.h

@@ -143,6 +143,10 @@ typedef void * lv_group_user_data_t;
 
 /* 1: Enable file system (might be required for images */
 #define LV_USE_FILESYSTEM       1
+#if LV_USE_FILESYSTEM
+/*Declare the type of the user data of file system drivers (can be e.g. `void *`, `int`, `struct`)*/
+typedef void * lv_fs_drv_user_data_t;
+#endif
 
 /* 1: Enable indexed (palette) images */
 #define LV_IMG_CF_INDEXED       1

src/lv_conf_checker.h

@@ -197,6 +197,9 @@
 #ifndef LV_USE_FILESYSTEM
 #define LV_USE_FILESYSTEM       1
 #endif
+#if LV_USE_FILESYSTEM
+/*Declare the type of the user data of file system drivers (can be e.g. `void *`, `int`, `struct`)*/
+#endif
 
 /* 1: Enable indexed (palette) images */
 #ifndef LV_IMG_CF_INDEXED

src/lv_misc/lv_fs.c

@@ -469,7 +469,7 @@ lv_fs_res_t lv_fs_free_space(char letter, uint32_t * total_p, uint32_t * free_p)
  * @param drv_p pointer to an lv_fs_drv_t structure which is inited with the
  * corresponding function pointers. The data will be copied so the variable can be local.
  */
-void lv_fs_add_drv(lv_fs_drv_t * drv_p)
+void lv_fs_drv_register(lv_fs_drv_t * drv_p)
 {
     /*Save the new driver*/
     lv_fs_drv_t * new_drv;

src/lv_misc/lv_fs.h

@@ -78,6 +78,10 @@ typedef struct _lv_fs_drv_t
     lv_fs_res_t (*dir_open)(struct _lv_fs_drv_t * drv, void * rddir_p, const char * path);
     lv_fs_res_t (*dir_read)(struct _lv_fs_drv_t * drv, void * rddir_p, char * fn);
     lv_fs_res_t (*dir_close)(struct _lv_fs_drv_t * drv, void * rddir_p);
+
+#if LV_USE_USER_DATA
+    lv_fs_drv_user_data_t user_data;
+#endif
 } lv_fs_drv_t;
 
 typedef struct
@@ -101,12 +105,20 @@ typedef struct
  */
 void lv_fs_init(void);
 
+/**
+ * Initialize a file system driver with default values.
+ * It is used to surly have known values in the fields ant not memory junk.
+ * After it you can set the fields.
+ * @param drv pointer to driver variable to initialize
+ */
+void lv_fs_drv_init(lv_fs_drv_t * drv);
+
 /**
  * Add a new drive
  * @param drv_p pointer to an lv_fs_drv_t structure which is inited with the
  * corresponding function pointers. The data will be copied so the variable can be local.
  */
-void lv_fs_add_drv(lv_fs_drv_t * drv_p);
+void lv_fs_drv_register(lv_fs_drv_t * drv_p);
 
 /**
  * Test if a drive is rady or not. If the `ready` function was not initialized `true` will be