make Doxygen comments a bit easier to read

server/drivers/curses_drv.c

@@ -104,7 +104,7 @@ Different implementations of (n)curses available on:
 #define DEFAULT_BACKGROUND_COLOR COLOR_BLUE
 
 
-/** private data structure for the \c curses driver */
+/** private data for the \c curses driver */
 typedef struct curses_private_data {
 	WINDOW *win;
 
@@ -625,7 +625,8 @@ curses_flush (Driver *drvthis)
 /**
  * Handle input from keyboard.
  * \param drvthis  Pointer to driver structure.
- * \return  String representation of the key.
+ * \return         String representation of the key;
+ *                 \c NULL if nothing available / unmapped key.
  */
 MODULE_EXPORT const char *
 curses_get_key (Driver *drvthis)

server/drivers/debug.c

@@ -47,15 +47,16 @@
 #define DEFAULT_OFFBRIGHTNESS	250
 
 
+/** private data for the \c debug driver */
 typedef struct debug_private_data {
-	char *framebuf;
-	int width;
-	int height;
-	int cellwidth;
-	int cellheight;
-	int contrast;
-	int brightness;
-	int offbrightness;
+	char *framebuf;		/**< frame buffer */
+	int width;		/**< display width in characters */
+	int height;		/**< display height in characters */
+	int cellwidth;		/**< character cell width */
+	int cellheight;		/**< character cell height */
+	int contrast;		/**< current contrast */
+	int brightness;		/**< current brightness (for backlight on) */
+	int offbrightness;	/**< current brightness (for backlight off) */
 } PrivateData;
 
 
@@ -485,7 +486,8 @@ debug_backlight (Driver *drvthis, int on)
 /**
  * Handle input from keyboard.
  * \param drvthis  Pointer to driver structure.
- * \return  String representation of the key.
+ * \return         String representation of the key;
+ *                 \c NULL if nothing available / unmapped key
  */
 MODULE_EXPORT const char *
 debug_get_key (Driver *drvthis)

server/drivers/text.c

@@ -37,11 +37,11 @@
 //#include "drv_base.h"
 
 
-/* private data structure for the \c text driver */
+/** private data for the \c text driver */
 typedef struct text_private_data {
-	int width;
-	int height;
-	char *framebuf;
+	int width;		/**< display width in characters */
+	int height;		/**< display height in characters */
+	char *framebuf;		/**< fram buffer */
 } PrivateData;
 
 
@@ -141,8 +141,9 @@ text_width (Driver *drvthis)
 
 
 /**
- * Clear the screen.
+ * Return the display height in characters.
  * \param drvthis  Pointer to driver structure.
+ * \return         Number of characters the display is high.
  */
 MODULE_EXPORT int
 text_height (Driver *drvthis)