From owner-freebsd-questions  Tue May  8  6:53:58 2001
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Date: Tue, 8 May 2001 14:53:42 +0100 (BST)
Message-Id: <200105081353.OAA24182@rhymer.cogsci.ed.ac.uk>
From: Richard Tobin <richard@cogsci.ed.ac.uk>
Subject: Re: Sony Z600-HEK - un-recommendation
To: wayne.pascoe@realtime.co.uk, freebsd-mobile@FreeBSD.ORG,
	freebsd-questions@FreeBSD.ORG
In-Reply-To: Wayne Pascoe's message of 08 May 2001 10:19:51 +0100
Organization: just say no
Sender: owner-freebsd-questions@FreeBSD.ORG
Precedence: bulk
X-Loop: FreeBSD.ORG

> 1. Screen brightess - Only works under windows.

Here is a program to set the brightness under FreeBSD.  0 seems to be
full brightness, 255 minimum.  You'll have to be root to run it.  It's
based on a Linux program.

-- Richard

/* Set brightness of Vaio screen.  Tested on Z600-TEK. */
/* Based on http://us1.samba.org/ftp/unpacked/picturebook/setbrightness.c */

#include <stdio.h>
#include <unistd.h>
#include <fcntl.h>
#include <machine/cpufunc.h>

#define DATA_REG 0x62
#define CST_REG  0x66

typedef unsigned short u16;

static void ecr_set(u16 addr, u16 value)
{
        while (inw(CST_REG) & 3) usleep(1);
        outw(CST_REG, 0x81);
        while (inw(CST_REG) & 2) usleep(1);
        outw(DATA_REG, addr);
        while (inw(CST_REG) & 2) usleep(1);
        outw(DATA_REG, value);
        while (inw(CST_REG) & 2) usleep(1);
}

static u16 ecr_get(u16 addr)
{
        while (inw(CST_REG) & 3) usleep(1);
        outb(CST_REG, 0x80);
        while (inw(CST_REG) & 2) usleep(1);
        outb(DATA_REG, addr);
        while (inw(CST_REG) & 2) usleep(1);
        return inw(DATA_REG);
}

int main(int argc, char *argv[])
{
    if(open("/dev/io", O_RDWR, 0) < 0)
    {
	perror("/dev/io");
	return 1;
    }
    printf("currently %x\n", ecr_get(0x96));
    ecr_set(0x96, atoi(argv[1]));
    return 0;
}

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