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/*
* ----------------------------------------------------------------------------
* fblevel - sets the fb device brightness level on Apple Powerbooks
*
* Copyright 2000 Stephan Leemburg <stephan@jvc.nl>
*
* 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.
* ----------------------------------------------------------------------------
* $Log: fblevel.c,v $
* Revision 1.1.1.1 2001/12/07 11:31:50 sleemburg
* Initial CVS import of the unreleased pmud-0.8 to apmud (new project name
* because of a name clash at sourceforge.net).
*
* Revision 1.3 2001/11/09 10:55:29 stephan
* use "pmu.h"
*
* Revision 1.2 2000/10/09 14:16:33 stephan
* use /dev/fb0 in stead of /dev/fb
*
* Revision 1.1 2000/05/11 14:48:46 stephan
* Initial revision
*
* ----------------------------------------------------------------------------
*/
#include <stdio.h>
#include <ctype.h>
#include <errno.h>
#include <stdlib.h>
#include <string.h>
#include <sys/ioctl.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <unistd.h>
#include <linux/fb.h>
#include <linux/pmu.h>
#ifndef FBIOBLANK
#define FBIOBLANK 0x4611 /* 0 or vesa-level+1 */
#endif
static void fbon(int on);
static int set_fblevel(int level);
static int get_fblevel(void);
static void usage(char *program);
int main(int argc, char **argv)
{
char *program = strrchr(*argv, '/');
program = program ? program + 1 : *argv;
switch(argc)
{
case 1:
printf("%d\n", get_fblevel());
break;
case 2:
if(!strcasecmp(*++argv, "on")
|| !strcasecmp(*argv, "off"))
fbon(strcasecmp(*argv, "off"));
else
{
register char *p;
for(p = *argv; *p && isdigit(*p); p++)
;
if(*p)
{
usage(program);
return 1;
}
if(!set_fblevel(atoi(*argv)))
return 1;
}
break;
default:
usage(program);
return 1;
}
return 0;
}
static void fbon(int on)
{
static int fd = -1;
if(fd<0)
{
fd = open("/dev/fb0", O_RDONLY);
if(fd<0)
{
perror("/dev/fb0");
return;
}
}
(void)ioctl(fd, FBIOBLANK, !on);
}
static int set_fblevel(int level)
{
int fd, ret=0;
if ( (fd = open("/dev/pmu", O_RDONLY)) < 0 ) {
perror("/dev/pmu");
goto out;
}
if(ioctl(fd, PMU_IOC_SET_BACKLIGHT, &level) == -1) {
perror("ioctl PMU_IOC_SET_BACKLIGHT");
goto out;
}
ret = 1; /* success */
out:
close(fd);
return ret;
}
static int get_fblevel(void)
{
int fd, level=0;
if ( (fd = open("/dev/pmu", O_RDONLY)) < 0 ) {
perror("/dev/pmu");
goto out;
}
if(ioctl(fd, PMU_IOC_GET_BACKLIGHT, &level) == -1) {
perror("ioctl PMU_IOC_GET_BACKLIGHT");
goto out;
}
out:
close(fd);
return level;
}
static void usage(char *program)
{
fprintf(stderr,
"usage: %s [on|off|<level>]\n"
" on : powers display on\n"
" off : powers display off\n"
" <level>: set display brightness to <level>\n"
" (level is an integer)\n"
"no argument prints the current brightness level\n",
program
);
}
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