218 lines
6.4 KiB
C
218 lines
6.4 KiB
C
/*
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* This file is subject to the terms of the GFX License. If a copy of
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* the license was not distributed with this file, you can obtain one at:
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*
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* http://ugfx.org/license.html
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*/
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// Set this to your frame buffer pixel format. Note Linux frame buffer only supports RGB modes (no BGR modes).
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#ifndef GDISP_LLD_PIXELFORMAT
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#define GDISP_LLD_PIXELFORMAT GDISP_PIXELFORMAT_RGB888
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#endif
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#ifdef GDISP_DRIVER_VMT
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#define FBDEV_PATH1 "/dev/fb0"
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#define FBDEV_PATH2 "/dev/fb/0" // Optional - comment this out to only try the one device
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#define USE_SET_MODE // Optional - comment this out to not to try to set the color mode we want
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//#define VTDEV_PATH "/dev/tty0" // Optional - if defined use this tty to switch from text to graphics mode
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#define _GNU_SOURCE 1
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#include <fcntl.h>
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#include <limits.h>
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#include <linux/fb.h>
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#include <linux/kd.h>
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#include <linux/vt.h>
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#include <stdarg.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <sys/ioctl.h>
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#include <sys/mman.h>
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#include <sys/stat.h>
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#include <sys/time.h>
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#include <sys/types.h>
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#include <unistd.h>
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#if VTDEV_PATH
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static void board_revert2textmode(void) {
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int tty;
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// Go back to text mode
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if ((tty = open(VTDEV_PATH, O_RDWR)) >= 0) {
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ioctl(tty, KDSETMODE, KD_TEXT);
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close(tty);
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}
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}
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static void board_switch2graphicsmode(void) {
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int tty;
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// Open the tty
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if ((tty = open (VTDEV_PATH, O_RDWR)) < 0) {
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fprintf(stderr, "GDISP Framebuffer: Cannot open tty %s\n", VTDEV_PATH);
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exit(-1);
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}
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if (ioctl (tty, KDSETMODE, KD_GRAPHICS) == -1) {
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fprintf(stderr, "GDISP Framebuffer: Cannot set to graphics mode\n");
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exit(-1);
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}
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close(tty);
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// Make sure we clean up properly
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atexit(board_revert2textmode)
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}
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#endif
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static void board_init(GDisplay *g, fbInfo *fbi) {
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int fb;
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char * env;
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size_t fblen;
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struct fb_fix_screeninfo fb_fix;
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struct fb_var_screeninfo fb_var;
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// Open the frame buffer device
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if((env = getenv("FRAMEBUFFER")) != 0)
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fb = open(env, O_RDWR);
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else {
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fb = open(FBDEV_PATH1, O_RDWR);
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#ifdef FBDEV_PATH2
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if (fb < 0) fb = open(FBDEV_PATH2, O_RDWR);
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#endif
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}
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if(fb < 0) {
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fprintf(stderr, "GDISP Framebuffer: Error opening the framebuffer device\n");
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exit(-1);
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}
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// Get screen info
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if (ioctl(fb, FBIOGET_FSCREENINFO, &fb_fix) == -1 || ioctl(fb, FBIOGET_VSCREENINFO, &fb_var) == -1) {
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fprintf(stderr, "GDISP Framebuffer: Error getting screen info\n");
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exit(-1);
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}
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#ifdef USE_SET_MODE
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fb_var.reserved[0] = 0;
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fb_var.reserved[1] = 0;
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fb_var.reserved[2] = 0;
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fb_var.xoffset = 0;
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fb_var.yoffset = 0;
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fb_var.bits_per_pixel = LLDCOLOR_BITS;
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fb_var.activate = FB_ACTIVATE_NOW;
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if (ioctl(fb, FBIOPUT_VSCREENINFO, &fb_var) == -1 || ioctl (fb, FBIOGET_VSCREENINFO, &fb_var) == -1) {
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fprintf(stderr, "GDISP Framebuffer: Failed to set video mode\n");
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exit(-1);
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}
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#endif
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// Check things are as they should be
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if (fb_fix.type != FB_TYPE_PACKED_PIXELS) {
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fprintf(stderr, "GDISP Framebuffer: The display is not in a single plane graphics mode\n");
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exit(-1);
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}
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if (fb_fix.visual != FB_VISUAL_TRUECOLOR) {
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fprintf(stderr, "GDISP Framebuffer: The display is not in TRUECOLOR mode\n");
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exit(-1);
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}
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if (fb_var.bits_per_pixel != LLDCOLOR_TYPE_BITS) {
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fprintf(stderr, "GDISP Framebuffer: The display is %u not %u bits per pixel\n", fb_var.bits_per_pixel, LLDCOLOR_TYPE_BITS);
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exit(-1);
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}
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if (fb_var.red.length != LLDCOLOR_BITS_R || fb_var.green.length != LLDCOLOR_BITS_G || fb_var.blue.length != LLDCOLOR_BITS_B) {
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fprintf(stderr, "GDISP Framebuffer: The display pixel format is not %d%d%d\n", LLDCOLOR_BITS_R, LLDCOLOR_BITS_G, LLDCOLOR_BITS_B);
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exit(-1);
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}
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if (fb_var.red.offset != LLDCOLOR_SHIFT_R || fb_var.green.offset != LLDCOLOR_SHIFT_G || fb_var.blue.offset != LLDCOLOR_SHIFT_B) {
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#if LLDCOLOR_SHIFT_B == 0
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fprintf(stderr, "GDISP Framebuffer: The display pixel format is not RGB\n");
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#else
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fprintf(stderr, "GDISP Framebuffer: The display pixel format is not BGR\n");
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#endif
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exit(-1);
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}
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// Ensure we are at the origin of the virtual display area
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if (fb_var.xoffset || fb_var.yoffset) {
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fb_var.xoffset = 0;
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fb_var.yoffset = 0;
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ioctl(fb, FBIOPAN_DISPLAY, &fb_var);
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}
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// Switch to graphics mode (if required)
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#ifdef VTDEV_PATH
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board_switch2graphicsmode();
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#endif
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// Calculate the frame buffer length
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fblen = fb_var.yres * fb_fix.line_length;
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// Different systems need mapping in slightly different ways - Yuck!
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#ifdef ARCH_LINUX_SPARC
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#define CG3_MMAP_OFFSET 0x4000000
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#define CG6_RAM 0x70016000
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#define TCX_RAM8BIT 0x00000000
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#define TCX_RAM24BIT 0x01000000
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switch (fb_fix.accel) {
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case FB_ACCEL_SUN_CGTHREE:
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fbi->pixels = mmap(0, fblen, PROT_READ|PROT_WRITE, MAP_SHARED, fb, CG3_MMAP_OFFSET);
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break;
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case FB_ACCEL_SUN_CGSIX:
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fbi->pixels = mmap(0, fblen, PROT_READ|PROT_WRITE, MAP_SHARED, fb, CG6_RAM);
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break;
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case FB_ACCEL_SUN_TCX:
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fbi->pixels = mmap(0, fblen, PROT_READ|PROT_WRITE, MAP_SHARED, fb, TCX_RAM24BIT);
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break;
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default:
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fprintf(stderr, "GDISP Framebuffer: Don't know how to mmap with accel %d\n", fb_fix.accel);
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exit(-1);
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}
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#elif defined(BLACKFIN)
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fbi->pixels = mmap(0, fblen, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FILE, fb, 0);
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#elif defined(__uClinux__)
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fbi->pixels = mmap(0, fblen, PROT_READ|PROT_WRITE, 0, fb, 0);
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#else
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fbi->pixels = mmap(0, fblen, PROT_READ|PROT_WRITE, MAP_SHARED, fb, 0);
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#endif
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if(!fbi->pixels || fbi->pixels == (void *)-1) {
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fprintf(stderr, "GDISP Framebuffer: mmap of display buffer failed\n");
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exit(-1);
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}
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// If this program gets children they should not inherit this file descriptor
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fcntl(fb, F_SETFD, FD_CLOEXEC);
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// We are finished with the file descriptor
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close(fb);
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// Set the rest of the details of the frame buffer
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g->g.Width = fb_var.xres;
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g->g.Height = fb_var.yres;
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g->g.Backlight = 100;
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g->g.Contrast = 50;
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fbi->linelen = fb_fix.line_length;
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}
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#if GDISP_HARDWARE_FLUSH
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static void board_flush(GDisplay *g) {
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(void) g;
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}
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#endif
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#if GDISP_NEED_CONTROL
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static void board_backlight(GDisplay *g, uint8_t percent) {
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(void) g;
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(void) percent;
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}
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static void board_contrast(GDisplay *g, uint8_t percent) {
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(void) g;
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(void) percent;
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}
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static void board_power(GDisplay *g, powermode_t pwr) {
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(void) g;
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(void) pwr;
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}
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#endif
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#endif /* GDISP_LLD_BOARD_IMPLEMENTATION */
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