glcd driver: Fix doxygen comments and add a section to the User's Guide.

server/drivers/glcd-low.h

@@ -77,7 +77,7 @@ typedef struct hwDependentFns {
  * function actually decides about the format of the framebuffer. Using this
  * implementation (0,0) is top left and bytes contain pixels from left to right.
  *
- * \param p      Pointer to driver's private data.
+ * \param fb     Pointer to framebuffer
  * \param x      X-position
  * \param y      Y-position
  * \param color  Pixel color: 1 = set (black), 0 = not set (blank/white)
@@ -104,9 +104,9 @@ fb_draw_pixel(struct glcd_framebuf *fb, int x, int y, int color)
 /**
  * Get color value of one pixel from the framebuffer.
  *
- * \param p  Pointer to driver's private data.
- * \param x  X-position
- * \param y  Y-position
+ * \param fb  Pointer to framebuffer
+ * \param x   X-position
+ * \param y   Y-position
  * \return  Pixel color: 1 = set (black), 0 = not set (blank/white)
  */
 static inline int

server/drivers/glcd-render.c

@@ -1,5 +1,7 @@
 /** \file server/drivers/glcd-render.c
  * Render glyphs to a framebuffer using FreeType2 or fixed 5x8 font.
+ *
+ * \todo  Add character encoding option.
  */
 
 /*-

server/drivers/glcd-t6963.c

@@ -10,7 +10,6 @@
  * Copyright (c) 2011 Markus Dolze, based on the t6963 driver by
  *               2001 Manuel Stahl <mythos@xmythos.de>
  *
- *
  * This file is released under the GNU General Public License. Refer to the
  * COPYING file distributed with this package.
  */
@@ -34,6 +33,7 @@ static void t6963_graphic_clear(PrivateData *p);
 void glcd_t6963_blit(PrivateData *p);
 void glcd_t6963_close(PrivateData *p);
 
+/** Data local to the t6963 connection type */
 typedef struct glcd_t6963_data {
 	unsigned char *backingstore;	/**< backing buffer */
 	T6963_port *port_config;	/**< parallel port configuration */