tools/sunos/hal-system-lcd-get-brightness-sunos.c

/***************************************************************************
 *
 * hal-system-lcd-get-brightness-sunos.c : Get LCD brightness
 *
 * Copyright 2008 Sun Microsystems, Inc.  All rights reserved.
 * Use is subject to license terms.
 *
 * Licensed under the Academic Free License version 2.1
 *
 **************************************************************************/

#pragma ident   "%Z%%M% %I% %E% SMI"

#ifdef HAVE_CONFIG_H
#include <config.h>
#endif

#include <errno.h>
#include <string.h>
#include <strings.h>
#include <ctype.h>
#include <stdlib.h>
#include <stdio.h>
#include <sys/ioctl.h>
#include <fcntl.h>
#include <unistd.h>
#include "../../hald/util.h"
#include <sys/acpi_drv.h>

int
main(int argc, char *argv[])
{
    struct acpi_drv_output_status status;
    int fd = -1;
    char *udi;
    char device_file[HAL_PATH_MAX] = "/devices";
    char *devfs_path;

    if ((udi = getenv("UDI")) == NULL) {
        return (-1);
    }
    if ((devfs_path = getenv("HAL_PROP_SOLARIS_DEVFS_PATH")) == NULL) {
        return (-1);
    }

    strlcat(device_file, devfs_path, HAL_PATH_MAX);
    fprintf(stderr, "Getting brightness on %s (udi=%s)",
        device_file, udi);
    if ((fd = open(device_file, O_RDONLY | O_NONBLOCK)) < 0) {
        fprintf(stderr, "Cannot open %s: %s", device_file,
            strerror(errno));
        return (-1);
    }

    bzero(&status, sizeof (status));
    if (ioctl(fd, ACPI_DRV_IOC_STATUS, &status) < 0) {
        close(fd);
        return (-1);
    } else {
        close(fd);
        return (status.cur_level_index);
    }
}