2f9e3cae2c
This patch adds to YP-R0 (and other future targets using Linux framebuffer) the ability to use LCD_ENABLE to save some CPU cycles while display is powered off. This patch also changes the way to toggle LCD power: now using a proper ioctl call, slightly more efficient. Change-Id: I544de77f5abd4ac1c13d3fe3a6e40a30f7c0bece Reviewed-on: http://gerrit.rockbox.org/410 Reviewed-by: Thomas Martitz <kugel@rockbox.org>
120 lines
No EOL
3.5 KiB
C
120 lines
No EOL
3.5 KiB
C
/***************************************************************************
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* __________ __ ___.
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* Open \______ \ ____ ____ | | _\_ |__ _______ ___
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* Source | _// _ \_/ ___\| |/ /| __ \ / _ \ \/ /
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* Jukebox | | ( <_> ) \___| < | \_\ ( <_> > < <
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* Firmware |____|_ /\____/ \___ >__|_ \|___ /\____/__/\_ \
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* \/ \/ \/ \/ \/
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* $Id: lcd-bitmap.c 29248 2011-02-08 20:05:25Z thomasjfox $
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*
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* Copyright (C) 2011 Lorenzo Miori, Thomas Martitz
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* Copyright (C) 2013 Lorenzo Miori
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version 2
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* of the License, or (at your option) any later version.
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*
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* This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
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* KIND, either express or implied.
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*
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****************************************************************************/
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#include <stdlib.h>
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#include <unistd.h>
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#include <stdio.h>
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#include <linux/fb.h>
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#include <sys/mman.h>
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#include <sys/ioctl.h>
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#include "config.h"
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#include "file.h"
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#include "debug.h"
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#include "system.h"
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#include "screendump.h"
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#include "lcd.h"
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#include "lcd-target.h"
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static int dev_fd = 0;
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fb_data *dev_fb = 0;
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#ifdef HAVE_LCD_SHUTDOWN
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void lcd_shutdown(void)
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{
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printf("FB closed.");
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munmap(dev_fb, FRAMEBUFFER_SIZE);
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close(dev_fd);
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}
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#endif
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void lcd_init_device(void)
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{
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size_t screensize;
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struct fb_var_screeninfo vinfo;
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struct fb_fix_screeninfo finfo;
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/* Open the framebuffer device */
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dev_fd = open("/dev/fb0", O_RDWR);
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if (dev_fd == -1) {
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perror("Error: cannot open framebuffer device");
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exit(1);
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}
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printf("The framebuffer device was opened successfully.\n");
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/* Get the fixed properties */
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if (ioctl(dev_fd, FBIOGET_FSCREENINFO, &finfo) == -1) {
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perror("Error reading fixed information");
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exit(2);
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}
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/* Now we get the settable settings, and we set 16 bit bpp */
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if (ioctl(dev_fd, FBIOGET_VSCREENINFO, &vinfo) == -1) {
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perror("Error reading variable information");
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exit(3);
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}
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vinfo.bits_per_pixel = LCD_DEPTH;
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if (ioctl(dev_fd, FBIOPUT_VSCREENINFO, &vinfo)) {
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perror("fbset(ioctl)");
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exit(4);
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}
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printf("%dx%d, %dbpp\n", vinfo.xres, vinfo.yres, vinfo.bits_per_pixel);
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/* Figure out the size of the screen in bytes */
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screensize = vinfo.xres * vinfo.yres * vinfo.bits_per_pixel / 8;
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if (screensize != FRAMEBUFFER_SIZE) {
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exit(4);
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perror("Display and framebuffer mismatch!\n");
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}
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/* Map the device to memory */
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dev_fb = mmap(0, screensize, PROT_READ | PROT_WRITE, MAP_SHARED, dev_fd, 0);
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if ((int)dev_fb == -1) {
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perror("Error: failed to map framebuffer device to memory");
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exit(4);
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}
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printf("The framebuffer device was mapped to memory successfully.\n");
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/* Be sure to turn on display at startup */
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ioctl(dev_fd, FBIOBLANK, VESA_NO_BLANKING);
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#ifdef HAVE_LCD_ENABLE
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lcd_set_active(true);
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#endif
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}
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#ifdef HAVE_LCD_ENABLE
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void lcd_enable(bool enable)
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{
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if (lcd_active() == enable)
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return;
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lcd_set_active(enable);
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/* Turn on or off the display using Linux interface */
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ioctl(dev_fd, FBIOBLANK, enable ? VESA_NO_BLANKING : VESA_POWERDOWN);
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if (enable)
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send_event(LCD_EVENT_ACTIVATION, NULL);
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}
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#endif |