Linux Device Drivers Development

Driver methods

Drivers methods consist of probe() and remove() functions. Prior to going further with these method descriptions, let us set up our fb_ops structure:

static struct fb_ops myfb_ops = { 
   .owner        = THIS_MODULE, 
   .fb_check_var = myfb_check_var, 
   .fb_set_par   = myfb_set_par, 
   .fb_setcolreg = myfb_setcolreg, 
   .fb_fillrect  = cfb_fillrect, /* Those three hooks are */  
   .fb_copyarea  = cfb_copyarea, /* non accelerated and */ 
   .fb_imageblit = cfb_imageblit, /* are provided by kernel */ 
   .fb_blank     = myfb_blank, 
}; 

• probe: The driver probe function is in charge of initializing the hardware, creating the struct fb_info structure using the framebuffer_alloc() function, and using register_framebuffer() on it. The following sample assumes the device ...