source: rtems/c/src/libmisc/mw-fb/mw_fb.c @ 152b1e3

/*
/////////////////////////////////////////////////////////////////////////////
// $Header$
//
// Copyright (c) 2000 - Rosimildo da Silva
//  
// MODULE DESCRIPTION: 
// Wrapper API around the ioctls calls for the Micro FrameBuffer 
// interface for Embedded Systems 
//
// All functions returns 0 on success. Any other value should be 
// decoded as an error. A list of errors will be created over time.
//
// MODIFICATION/HISTORY:
//
// $Log$
//
/////////////////////////////////////////////////////////////////////////////
*/

#include <sys/ioctl.h>
#include <rtems/mw_fb.h>


/* 
 * This function returns the information regarding the display.
 * It is called just after the driver be opened to get all needed
 * information about the driver. No change in the mode of operation
 * of the driver is done with this call.
 */
 int ufb_get_screen_info( int fd, struct fb_screeninfo *info )
 {
    return ioctl( fd, FB_SCREENINFO, ( void *)info);
 }



/* 
 * Returns the mode of the graphics subsystem 
 */
 int ufb_get_mode( int fd, int *mode )
 {
    struct fb_exec_function exec;
    exec.func_no = FB_FUNC_GET_MODE;
    exec.param = ( void *)mode;
    return ioctl( fd, FB_EXEC_FUNCTION , ( void *)&exec );
 }


/* 
 * Returns the current collor pallete 
 */
 int ufb_get_palette( int fd, struct fb_cmap *color )
 {
     return ioctl( fd, FB_GETPALETTE, ( void *)color );
 }


/* 
 * Set the current collor pallete 
 */
 int ufb_set_palette( int fd, struct fb_cmap *color )
 {
    return ioctl( fd, FB_SETPALETTE, ( void *)color );
 }

/* 
 * Does all necessary initialization to put the device in 
 * graphics mode 
 */
 int ufb_enter_graphics( int fd, int mode )
 {
    struct fb_exec_function exec;
    exec.func_no = FB_FUNC_ENTER_GRAPHICS;
    exec.param = ( void *)mode;
    return ioctl( fd, FB_EXEC_FUNCTION , ( void *)&exec );
 }


/* 
 * Switch the device back to the default mode of operation.
 * In most cases it put the device back to plain text mode.
 */
 int ufb_exit_graphics( int fd )
 {
    struct fb_exec_function exec;
    exec.func_no = FB_FUNC_EXIT_GRAPHICS;
    exec.param = 0;
    return ioctl( fd, FB_EXEC_FUNCTION , ( void *)&exec );
 }

/* 
 * Tell the driver that the "virtual buffer" is dirty, and an update 
 * of it to the real device, maybe a serial/parallel LCD or whatever 
 * is required 
 */
 int ufb_buffer_is_dirty( int fd )
 {
    struct fb_exec_function exec;
    exec.func_no = FB_FUNC_IS_DIRTY;
    exec.param = 0;
    return ioctl( fd, FB_EXEC_FUNCTION , ( void *)&exec );
 }



/* 
 * This function maps the physical ( kernel mode ) address of the framebuffer device
 * and maps it to the user space address.
 */
 int ufb_mmap_to_user_space( int fd, void **fb_addr, void *physical_addr, unsigned long size )
 {
 #ifdef __rtems__
    /* RTEMS runs in ring 0, and there is no distinction between
       user space and kernel space, so we just return the same 
       pointer to the caller.
     */
      *fb_addr = physical_addr;
      return 0;
 #else
 /* other kernels might want to map it to the user space, 
    maybe using mmap()
  */
      return 0;
 #endif

 }


/* 
 * This function unmaps memory of the FB from the user's space
 */
 int ufb_unmmap_from_user_space( int fd, void *addr )
 {
    return 0;
 }