/*** $Id: scr_fb.c,v 1.25 2003/09/04 02:57:09 weiym Exp $** ** scr_fb.c: GAL driver for Linux kernel FrameBuffers.** ** Copyright (C) 2003 Feynman Software.** Copyright (C) 2000 Song Lixin.*//*** This program is free software; you can redistribute it and/or modify** it under the terms of the GNU General Public License as published by** the Free Software Foundation; either version 2 of the License, or** (at your option) any later version.**** This program is distributed in the hope that it will be useful,** but WITHOUT ANY WARRANTY; without even the implied warranty of** MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the** GNU General Public License for more details.**** You should have received a copy of the GNU General Public License** along with this program; if not, write to the Free Software** Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA*/#include <fcntl.h>#include <limits.h>#include <linux/fb.h>#include <linux/kd.h>#include <linux/vt.h>#include <stdarg.h>#include <stdio.h>#include <stdlib.h>#include <sys/ioctl.h>#include <sys/mman.h>#include <sys/stat.h>#include <sys/time.h>#include <sys/types.h>#include <unistd.h>#include "native.h"#include "fb.h"#ifdef _LITE_VERSIONextern BOOL mgIsServer;#endif#ifndef FB_TYPE_VGA_PLANES#define FB_TYPE_VGA_PLANES 4#endif/* static variables*/static int fb;			/* Framebuffer file handle. */static int status;		/* 0=never inited, 1=once inited, 2=inited. */static short saved_red[16];	/* original hw palette*/static short saved_green[16];static short saved_blue[16];#ifdef _HAVE_TEXT_MODEstatic int tty = -1;#endif/* init framebuffer*/static PSD fb_open(PSD psd){	char *	env;	int	type, visual;	PSUBDRIVER subdriver;	struct fb_fix_screeninfo fb_fix;	struct fb_var_screeninfo fb_var;	/* locate and open framebuffer, get info*/	if(!(env = getenv ("FRAMEBUFFER")))		env = "/dev/fb0";	fb = open(env, O_RDWR);	if(fb < 0) {		fprintf(stderr,"GAL fbcon engine: Error when opening %s: %m. Please check kernel config.\n", env);		return NULL;	}	if(ioctl(fb, FBIOGET_FSCREENINFO, &fb_fix) == -1 ||		ioctl(fb, FBIOGET_VSCREENINFO, &fb_var) == -1) {			fprintf(stderr,"GAL fbcon engine: Error when reading screen info: %m.\n");			goto fail;	}	/* setup screen device from framebuffer info*/	type = fb_fix.type;	visual = fb_fix.visual;	psd->xres = psd->xvirtres = fb_var.xres;	psd->yres = psd->yvirtres = fb_var.yres;	/* set planes from fb type*/	if (type == FB_TYPE_VGA_PLANES)		psd->planes = 4;	else if (type == FB_TYPE_PACKED_PIXELS)		psd->planes = 1;	else psd->planes = 0;	/* force error later*/	psd->bpp = fb_var.bits_per_pixel;	psd->ncolors = (psd->bpp >= 24)? (1 << 24): (1 << psd->bpp);	/* set linelen to byte length, possibly converted later*/	psd->linelen = (psd->xres * psd->bpp) >> 3;    /*     * Some framebuffer drivers give wrong line_length value.     * If line_length < xres_virtual * bpp, it's certainly wrong.     * But how do i know if line_length > xres_virtual * bpp.     * God bless me!     *          James Liu     */    if (fb_fix.line_length > psd->linelen)        psd->linelen = fb_fix.line_length;	psd->size = 0;		/* force subdriver init of size*/	psd->flags = PSF_SCREEN;    /*     * For 1bpp, 2bpp and 4bpp framebuffer, some systems have     * different bit order. That means the highest bits represent     * the first pixel or the lowest bites represent first pixel.     *      * For example:     *      * EP7211 2bpp:                    Byte 1                                 Byte 2     *         | D0  D1 | D2  D3 | D4  D5 | D6  D7 |  | D0  D1 | D2  D3 | D4  D5 | D6  D7 |     *         | pixel0 | pixel1 | pixel2 | pixel3 |  | pixel4 | pixel5 | pixel6 | pixel7 |     *              * Helio 2bpp:                  Byte 1                                 Byte 2     *         | D0  D1 | D2  D3 | D4  D5 | D6  D7 |  | D0  D1 | D2  D3 | D4  D5 | D6  D7 |     *         | pixel3 | pixel2 | pixel1 | pixel0 |  | pixel7 | pixel6 | pixel5 | pixel4 |     */    if (fb_var.red.msb_right)        psd->flags |= PSF_MSBRIGHT;	/* set pixel format*/	if (visual == FB_VISUAL_TRUECOLOR || visual == FB_VISUAL_DIRECTCOLOR) {		switch(psd->bpp) {		case 8:			psd->pixtype = PF_TRUECOLOR332;		break;		case 16:			psd->pixtype = PF_TRUECOLOR565;		break;		case 24:			psd->pixtype = PF_TRUECOLOR888;		break;		case 32:			psd->pixtype = PF_TRUECOLOR0888;		break;		default:			fprintf(stderr, "GAL fbcon engine: Unsupported FrameBuffer type\n");			goto fail;		}	}    else         psd->pixtype = PF_PALETTE;	/* select a framebuffer subdriver based on planes and bpp*/	subdriver = select_fb_subdriver(psd);	if (!subdriver) {		fprintf(stderr,"GAL fbcon engine: No driver for screen type %d visual %d bpp %d\n",			type, visual, psd->bpp);		goto fail;	}	/*	 * set and initialize subdriver into screen driver	 * psd->size is calculated by subdriver init	 */	if(!set_subdriver(psd, subdriver, TRUE)) {		fprintf(stderr,"GAL fbcon engine: Driver initialize failed type %d visual %d bpp %d\n",			type, visual, psd->bpp);		goto fail;	}#ifdef _HAVE_TEXT_MODE#ifdef _LITE_VERSION    if (mgIsServer)#endif    {	    /* open tty, enter graphics mode*/        char* tty_dev;        if (geteuid() == 0)            tty_dev = "/dev/tty0";        else    /* not a super user, so try to open the control terminal */            tty_dev = "/dev/tty";	    tty = open (tty_dev, O_RDWR);	    if(tty < 0) {		    fprintf(stderr,"GAL fbcon engine: Can't open /dev/tty0: %m\n");		    goto fail;	    }	    if(ioctl (tty, KDSETMODE, KD_GRAPHICS) == -1) {		    fprintf(stderr,"GAL fbcon engine: Error when setting console to graphics mode: %m\n");		    fprintf(stderr,"GAL fbcon engine: Maybe have no enough permission.\n");		    goto fail;	    }    }#endif	/* mmap framebuffer into this address space*/	psd->size = (psd->size + getpagesize () - 1)			/ getpagesize () * getpagesize ();#ifdef __uClinux__	psd->addr = mmap(NULL, psd->size, PROT_READ | PROT_WRITE, 0, fb, 0);#else	psd->addr = mmap(NULL, psd->size, PROT_READ | PROT_WRITE, MAP_SHARED, fb, 0);#endif	if(psd->addr == NULL || psd->addr == (unsigned char *)-1) {		fprintf(stderr,"GAL fbcon engine: Error when mmaping %s: %m\n", env);		goto fail;	}	/* save original palette*/	ioctl_getpalette(0, 16, saved_red, saved_green, saved_blue);	status = 2;	psd->gr_mode = MODE_SET;	return psd;	/* success*/fail:#ifdef _HAVE_TEXT_MODE#ifdef _LITE_VERSION    if (mgIsServer) {#endif	    /* enter text mode*/        if (tty >= 0) {	        ioctl (tty, KDSETMODE, KD_TEXT);	        close (tty);            tty = -1;        }#ifdef _LITE_VERSION    }#endif#endif	close(fb);	return NULL;}/* close framebuffer*/static void fb_close(PSD psd){	/* if not opened, return*/	if(status != 2)		return;	status = 1;  	/* reset hw palette*/	ioctl_setpalette(0, 16, saved_red, saved_green, saved_blue);  	/* unmap framebuffer*/	munmap(psd->addr, psd->size);  #ifdef _HAVE_TEXT_MODE#ifdef _LITE_VERSION    if (mgIsServer) {#endif	    /* enter text mode*/        if (tty >= 0) {	        ioctl (tty, KDSETMODE, KD_TEXT);	        close (tty);            tty = -1;        }#ifdef _LITE_VERSION    }#endif#endif	/* close framebuffer*/	close(fb);}static int fade = 100;static void fb_setpalette(PSD psd,int first, int count, GAL_Color *palette){	int 	i;	unsigned short 	red[count];	unsigned short 	green[count];	unsigned short 	blue[count];	/* convert palette to framebuffer format*/	for(i=0; i < count; i++) {		GAL_Color *p = &palette[i];		/* grayscale computation:		 * red[i] = green[i] = blue[i] =		 *	(p->r * 77 + p->g * 151 + p->b * 28);		 */		red[i] = (p->r * fade / 100) << 8;		green[i] = (p->g * fade / 100) << 8;		blue[i] = (p->b * fade / 100) << 8;	}	ioctl_setpalette(first, count, red, green, blue);}static void fb_getpalette(PSD psd,int first, int count, GAL_Color *palette){	int 	i;	unsigned short 	red[count];	unsigned short 	green[count];	unsigned short 	blue[count];	ioctl_getpalette(first,count,red,green,blue);	for(i=0; i < count; i++) {		GAL_Color *p = &palette[i];		/* grayscale computation:		 * red[i] = green[i] = blue[i] =		 *	(p->r * 77 + p->g * 151 + p->b * 28);		 */		p->r = (red[i] >> 8) * 100 / fade;		p->g = (green[i] >>8) * 100 / fade;		p->b = (blue[i] >>8) * 100 / fade;	}}/* get framebuffer palette*/void ioctl_getpalette(int start, int len, short *red, short *green, short *blue){	struct fb_cmap cmap;	cmap.start = start;	cmap.len = len;	cmap.red = red;	cmap.green = green;	cmap.blue = blue;	cmap.transp = NULL;	ioctl(fb, FBIOGETCMAP, &cmap);}/* set framebuffer palette*/void ioctl_setpalette(int start, int len, short *red, short *green, short *blue){	struct fb_cmap cmap;	cmap.start = start;	cmap.len = len;	cmap.red = red;	cmap.green = green;	cmap.blue = blue;	cmap.transp = NULL;	ioctl(fb, FBIOPUTCMAP, &cmap);}SCREENDEVICE scrdev = {	0, 0, 0, 0, 0, 	0, 0, 0, 0, 0, 	0, 0, 0, 0, 0, 	0, 0, 0, 0, 	NULL, NULL,	fb_open,	fb_close,	fb_setpalette,	fb_getpalette,	native_gen_allocatememgc,	fb_mapmemgc,	native_gen_freememgc,	native_gen_clippoint,	native_gen_fillrect,	NULL,			/* DrawPixel subdriver*/	NULL,			/* ReadPixel subdriver*/	NULL,			/* DrawHLine subdriver*/	NULL,			/* DrawVLine subdriver*/	NULL,			/* Blit subdriver*/	NULL,			/* PutBox subdriver*/	NULL			/* CopyBox subdriver*/};