sbusfb.c

S3C44B0X下的LCD （framebuffer）驱动资料与相关代码

			for (i = fb->cursor.size.fby - 1; i >= 0; i--) {
				fb->cursor.bits [0][i] &= u;
				fb->cursor.bits [1][i] &= fb->cursor.bits [0][i];
			}
		} else {
			u = 0xffffffff << (64 - f.size.fbx);
			for (i = fb->cursor.size.fby - 1; i >= 0; i--) {
				fb->cursor.bits [0][2*i+1] &= u;
				fb->cursor.bits [1][2*i] &= fb->cursor.bits [0][2*i];
				fb->cursor.bits [1][2*i+1] &= fb->cursor.bits [0][2*i+1];
			}
		}
		(*fb->setcurshape) (fb);
	}
	if (op & (FB_CUR_SETCUR | FB_CUR_SETPOS | FB_CUR_SETHOT)){
		if (op & FB_CUR_SETCUR)
			fb->cursor.enable = f.enable;
		if (op & FB_CUR_SETPOS)
			fb->cursor.cpos = f.pos;
		if (op & FB_CUR_SETHOT)
			fb->cursor.chot = f.hot;
		(*fb->setcursor) (fb);
	}
	return 0;
}

static unsigned char hw_cursor_cmap[2] = { 0, 0xff };

static void
sbusfb_cursor_timer_handler(unsigned long dev_addr)
{
	struct fb_info_sbusfb *fb = (struct fb_info_sbusfb *)dev_addr;
        
	if (!fb->setcursor) return;
                                
	if (fb->cursor.mode & CURSOR_BLINK) {
		fb->cursor.enable ^= 1;
		fb->setcursor(fb);
	}
	
	fb->cursor.timer.expires = jiffies + fb->cursor.blink_rate;
	add_timer(&fb->cursor.timer);
}

static void sbusfb_cursor(struct display *p, int mode, int x, int y)
{
	struct fb_info_sbusfb *fb = sbusfbinfod(p);
	
	switch (mode) {
	case CM_ERASE:
		fb->cursor.mode &= ~CURSOR_BLINK;
		fb->cursor.enable = 0;
		(*fb->setcursor)(fb);
		break;
				  
	case CM_MOVE:
	case CM_DRAW:
		if (fb->cursor.mode & CURSOR_SHAPE) {
			fb->cursor.size.fbx = fontwidth(p);
			fb->cursor.size.fby = fontheight(p);
			fb->cursor.chot.fbx = 0;
			fb->cursor.chot.fby = 0;
			fb->cursor.enable = 1;
			memset (fb->cursor.bits, 0, sizeof (fb->cursor.bits));
			fb->cursor.bits[0][fontheight(p) - 2] = (0xffffffff << (32 - fontwidth(p)));
			fb->cursor.bits[1][fontheight(p) - 2] = (0xffffffff << (32 - fontwidth(p)));
			fb->cursor.bits[0][fontheight(p) - 1] = (0xffffffff << (32 - fontwidth(p)));
			fb->cursor.bits[1][fontheight(p) - 1] = (0xffffffff << (32 - fontwidth(p)));
			(*fb->setcursormap) (fb, hw_cursor_cmap, hw_cursor_cmap, hw_cursor_cmap);
			(*fb->setcurshape) (fb);
		}
		fb->cursor.mode = CURSOR_BLINK;
		if (fontwidthlog(p))
			fb->cursor.cpos.fbx = (x << fontwidthlog(p)) + fb->x_margin;
		else
			fb->cursor.cpos.fbx = (x * fontwidth(p)) + fb->x_margin;
		if (fontheightlog(p))
			fb->cursor.cpos.fby = (y << fontheightlog(p)) + fb->y_margin;
		else
			fb->cursor.cpos.fby = (y * fontheight(p)) + fb->y_margin;
		(*fb->setcursor)(fb);
		break;
	}
}

    /*
     *  Get the Colormap
     */

static int sbusfb_get_cmap(struct fb_cmap *cmap, int kspc, int con,
			 struct fb_info *info)
{
	if (!info->display_fg || con == info->display_fg->vc_num) /* current console? */
		return fb_get_cmap(cmap, kspc, sbusfb_getcolreg, info);
	else if (fb_display[con].cmap.len) /* non default colormap? */
		fb_copy_cmap(&fb_display[con].cmap, cmap, kspc ? 0 : 2);
	else
		fb_copy_cmap(fb_default_cmap(1<<fb_display[con].var.bits_per_pixel), cmap, kspc ? 0 : 2);
	return 0;
}

    /*
     *  Set the Colormap
     */

static int sbusfb_set_cmap(struct fb_cmap *cmap, int kspc, int con,
			 struct fb_info *info)
{
	int err;
	struct display *disp;

	if (con >= 0)
		disp = &fb_display[con];
	else
		disp = info->disp;
	if (!disp->cmap.len) {	/* no colormap allocated? */
		if ((err = fb_alloc_cmap(&disp->cmap, 1<<disp->var.bits_per_pixel, 0)))
			return err;
	}
	if (con == currcon) {			/* current console? */
		err = fb_set_cmap(cmap, kspc, sbusfb_setcolreg, info);
		if (!err) {
			struct fb_info_sbusfb *fb = sbusfbinfo(info);
			
			if (fb->loadcmap)
				(*fb->loadcmap)(fb, &fb_display[con], cmap->start, cmap->len);
		}
		return err;
	} else
		fb_copy_cmap(cmap, &disp->cmap, kspc ? 0 : 1);
	return 0;
}

static int sbusfb_ioctl(struct inode *inode, struct file *file, u_int cmd,
			u_long arg, int con, struct fb_info *info)
{
	struct fb_info_sbusfb *fb = sbusfbinfo(info);
	int i;
	int lastconsole;
	
	switch (cmd){
	case FBIOGTYPE:		/* return frame buffer type */
		if (copy_to_user((struct fbtype *)arg, &fb->type, sizeof(struct fbtype)))
			return -EFAULT;
		break;
	case FBIOGATTR: {
		struct fbgattr *fba = (struct fbgattr *) arg;
		
		i = verify_area (VERIFY_WRITE, (void *) arg, sizeof (struct fbgattr));
		if (i) return i;
		if (__put_user(fb->emulations[0], &fba->real_type) ||
		    __put_user(0, &fba->owner) ||
		    __copy_to_user(&fba->fbtype, &fb->type,
				   sizeof(struct fbtype)) ||
		    __put_user(0, &fba->sattr.flags) ||
		    __put_user(fb->type.fb_type, &fba->sattr.emu_type) ||
		    __put_user(-1, &fba->sattr.dev_specific[0]))
			return -EFAULT;
		for (i = 0; i < 4; i++) {
			if (put_user(fb->emulations[i], &fba->emu_types[i]))
				return -EFAULT;
		}
		break;
	}
	case FBIOSATTR:
		i = verify_area (VERIFY_READ, (void *) arg, sizeof (struct fbsattr));
		if (i) return i;
		return -EINVAL;
	case FBIOSVIDEO:
		if (fb->consolecnt) {
			lastconsole = info->display_fg->vc_num;
			if (vt_cons[lastconsole]->vc_mode == KD_TEXT)
 				break;
 		}
		if (get_user(i, (int *)arg))
			return -EFAULT;
		if (i){
			if (!fb->blanked || !fb->unblank)
				break;
			if (fb->consolecnt || (fb->open && fb->mmaped))
				(*fb->unblank)(fb);
			fb->blanked = 0;
		} else {
			if (fb->blanked || !fb->blank)
				break;
			(*fb->blank)(fb);
			fb->blanked = 1;
		}
		break;
	case FBIOGVIDEO:
		if (put_user(fb->blanked, (int *) arg))
			return -EFAULT;
		break;
	case FBIOGETCMAP_SPARC: {
		char *rp, *gp, *bp;
		int end, count, index;
		struct fbcmap *cmap;

		if (!fb->loadcmap)
			return -EINVAL;
		i = verify_area (VERIFY_READ, (void *) arg, sizeof (struct fbcmap));
		if (i) return i;
		cmap = (struct fbcmap *) arg;
		if (__get_user(count, &cmap->count) ||
		    __get_user(index, &cmap->index))
			return -EFAULT;
		if ((index < 0) || (index > 255))
			return -EINVAL;
		if (index + count > 256)
			count = 256 - index;
		if (__get_user(rp, &cmap->red) ||
		    __get_user(gp, &cmap->green) ||
		    __get_user(bp, &cmap->blue))
			return -EFAULT;
		if (verify_area (VERIFY_WRITE, rp, count))
			return -EFAULT;
		if (verify_area (VERIFY_WRITE, gp, count))
			return -EFAULT;
		if (verify_area (VERIFY_WRITE, bp, count))
			return -EFAULT;
		end = index + count;
		for (i = index; i < end; i++){
			if (__put_user(fb->color_map CM(i,0), rp) ||
			    __put_user(fb->color_map CM(i,1), gp) ||
			    __put_user(fb->color_map CM(i,2), bp))
				return -EFAULT;
			rp++; gp++; bp++;
		}
		(*fb->loadcmap)(fb, NULL, index, count);
		break;			
	}
	case FBIOPUTCMAP_SPARC: {	/* load color map entries */
		char *rp, *gp, *bp;
		int end, count, index;
		struct fbcmap *cmap;
		
		if (!fb->loadcmap || !fb->color_map)
			return -EINVAL;
		i = verify_area (VERIFY_READ, (void *) arg, sizeof (struct fbcmap));
		if (i) return i;
		cmap = (struct fbcmap *) arg;
		if (__get_user(count, &cmap->count) ||
		    __get_user(index, &cmap->index))
			return -EFAULT;
		if ((index < 0) || (index > 255))
			return -EINVAL;
		if (index + count > 256)
			count = 256 - index;
		if (__get_user(rp, &cmap->red) ||
		    __get_user(gp, &cmap->green) ||
		    __get_user(bp, &cmap->blue))
			return -EFAULT;
		if (verify_area (VERIFY_READ, rp, count))
			return -EFAULT;
		if (verify_area (VERIFY_READ, gp, count))
			return -EFAULT;
		if (verify_area (VERIFY_READ, bp, count))
			return -EFAULT;

		end = index + count;
		for (i = index; i < end; i++){
			if (__get_user(fb->color_map CM(i,0), rp))
				return -EFAULT;
			if (__get_user(fb->color_map CM(i,1), gp))
				return -EFAULT;
			if (__get_user(fb->color_map CM(i,2), bp))
				return -EFAULT;
			rp++; gp++; bp++;
		}
		(*fb->loadcmap)(fb, NULL, index, count);
		break;			
	}
	case FBIOGCURMAX: {
		struct fbcurpos *p = (struct fbcurpos *) arg;
		if (!fb->setcursor) return -EINVAL;
		if(verify_area (VERIFY_WRITE, p, sizeof (struct fbcurpos)))
			return -EFAULT;
		if (__put_user(fb->cursor.hwsize.fbx, &p->fbx) ||
		    __put_user(fb->cursor.hwsize.fby, &p->fby))
			return -EFAULT;
		break;
	}
	case FBIOSCURSOR:
		if (!fb->setcursor) return -EINVAL;
 		if (fb->consolecnt) {
 			lastconsole = info->display_fg->vc_num; 
 			if (vt_cons[lastconsole]->vc_mode == KD_TEXT)
 				return -EINVAL; /* Don't let graphics programs hide our nice text cursor */
			fb->cursor.mode = CURSOR_SHAPE; /* Forget state of our text cursor */
		}
		return sbus_hw_scursor ((struct fbcursor *) arg, fb);

	case FBIOSCURPOS:
		if (!fb->setcursor) return -EINVAL;
		/* Don't let graphics programs move our nice text cursor */
 		if (fb->consolecnt) {
 			lastconsole = info->display_fg->vc_num; 
 			if (vt_cons[lastconsole]->vc_mode == KD_TEXT)
 				return -EINVAL; /* Don't let graphics programs move our nice text cursor */
 		}
		if (copy_from_user(&fb->cursor.cpos, (void *)arg, sizeof(struct fbcurpos)))
			return -EFAULT;
		(*fb->setcursor) (fb);
		break;
	default:
		if (fb->ioctl)
			return fb->ioctl(fb, cmd, arg);
		return -EINVAL;
	}		
	return 0;
}

    /*
     *  Setup: parse used options
     */

int __init sbusfb_setup(char *options)
{
	char *p;
	
	for (p = options;;) {
		if (!strncmp(p, "nomargins", 9)) {
			defx_margin = 0; defy_margin = 0;
		} else if (!strncmp(p, "margins=", 8)) {
			int i, j;
			char *q;
			
			i = simple_strtoul(p+8,&q,10);
			if (i >= 0 && *q == 'x') {
			    j = simple_strtoul(q+1,&q,10);
			    if (j >= 0 && (*q == ' ' || !*q)) {
			    	defx_margin = i; defy_margin = j;
			    }
			}
		} else if (!strncmp(p, "font=", 5)) {
			int i;
			
			for (i = 0; i < sizeof(fontname) - 1; i++)
				if (p[i+5] == ' ' || !p[i+5])
					break;
			memcpy(fontname, p+5, i);
			fontname[i] = 0;
		} else if (!strncmp(p, "noblink", 7))
			curblink = 0;
		while (*p && *p != ' ' && *p != ',') p++;
		if (*p != ',') break;
		p++;
	}
	return 0;
}

static int sbusfbcon_switch(int con, struct fb_info *info)
{
	int x_margin, y_margin;
	struct fb_info_sbusfb *fb = sbusfbinfo(info);
	int lastconsole;
    
	/* Do we have to save the colormap? */
	if (fb_display[currcon].cmap.len)
		fb_get_cmap(&fb_display[currcon].cmap, 1, sbusfb_getcolreg, info);

	if (info->display_fg) {
		lastconsole = info->display_fg->vc_num;
		if (lastconsole != con && 
		    (fontwidth(&fb_display[lastconsole]) != fontwidth(&fb_display[con]) ||
		     fontheight(&fb_display[lastconsole]) != fontheight(&fb_display[con])))
			fb->cursor.mode |= CURSOR_SHAPE;
	}
	x_margin = (fb_display[con].var.xres_virtual - fb_display[con].var.xres) / 2;
	y_margin = (fb_display[con].var.yres_virtual - fb_display[con].var.yres) / 2;
	if (fb->margins)
		fb->margins(fb, &fb_display[con], x_margin, y_margin);
	if (fb->graphmode || fb->x_margin != x_margin || fb->y_margin != y_margin) {
		fb->x_margin = x_margin; fb->y_margin = y_margin;
		sbusfb_clear_margin(&fb_display[con], 0);
	}
	currcon = con;
	/* Install new colormap */
	do_install_cmap(con, info);
	return 0;
}

    /*
     *  Update the `var' structure (called by fbcon.c)
     */

static int sbusfbcon_updatevar(int con, struct fb_info *info)
{
	/* Nothing */
	return 0;
}

    /*
     *  Blank the display.
     */

static void sbusfbcon_blank(int blank, struct fb_info *info)
{
    struct fb_info_sbusfb *fb = sbusfbinfo(info);
    
    if (blank && fb->blank)
    	return fb->blank(fb);
    else if (!blank && fb->unblank)
    	return fb->unblank(fb);
}