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/* acme-fb-level.c
Copyright (C) 2002, 2003 Bastien Nocera
The Gnome Library is free software; you can redistribute it and/or
modify it under the terms of the GNU Library General Public License as
published by the Free Software Foundation; either version 2 of the
License, or (at your option) any later version.
The Gnome Library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Library General Public License for more details.
You should have received a copy of the GNU Library General Public
License along with the Gnome Library; see the file COPYING.LIB. If not,
write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
Boston, MA 02111-1307, USA.
Author: Bastien Nocera <hadess@hadess.net>
*/
#include "config.h"
#include "acme-fb-level.h"
#include <fcntl.h>
#include <stdio.h>
#include <unistd.h>
#include <string.h>
#include <sys/ioctl.h>
#include <linux/fb.h>
#include <linux/pmu.h>
#include <errno.h>
#ifndef FBIOBLANK
#define FBIOBLANK 0x4611 /* 0 or vesa-level+1 */
#endif
#ifndef PMU_IOC_GRAB_BACKLIGHT
#define PMU_IOC_GRAB_BACKLIGHT _IOR('B', 6, 0)
#endif
G_DEFINE_TYPE (AcmeFblevel, acme_fblevel, G_TYPE_OBJECT)
struct AcmeFblevelPrivate {
int pmu_fd;
int saved_level;
};
static GObjectClass *parent_class = NULL;
static void
acme_fblevel_finalize (GObject *obj_self)
{
AcmeFblevel *self = ACME_FBLEVEL (obj_self);
gpointer priv = self->_priv;
if (G_OBJECT_CLASS(parent_class)->finalize)
(* G_OBJECT_CLASS(parent_class)->finalize)(obj_self);
g_free (priv);
return;
}
static void
acme_fblevel_class_init (AcmeFblevelClass *klass)
{
GObjectClass *g_object_class = (GObjectClass*) klass;
parent_class = g_type_class_ref (G_TYPE_OBJECT);
g_object_class->finalize = acme_fblevel_finalize;
return;
}
static void
acme_fblevel_init (AcmeFblevel *fblevel)
{
fblevel->_priv = g_new0 (AcmeFblevelPrivate, 1);
fblevel->level = 0;
fblevel->dim = FALSE;
fblevel->_priv->pmu_fd = -1;
fblevel->_priv->saved_level = 0;
return;
}
int
acme_fblevel_get_level (AcmeFblevel *self)
{
int level;
ioctl (self->_priv->pmu_fd,
PMU_IOC_GET_BACKLIGHT, &level);
return level;
}
void
acme_fblevel_set_level (AcmeFblevel *self, int val)
{
int level;
level = CLAMP (val, 0, 15);
ioctl (self->_priv->pmu_fd,
PMU_IOC_SET_BACKLIGHT, &level);
self->level = level;
}
gboolean
acme_fblevel_get_dim (AcmeFblevel *self)
{
return self->dim;
}
void
acme_fblevel_set_dim (AcmeFblevel *self, gboolean val)
{
if (self->dim == FALSE && val == TRUE)
{
self->_priv->saved_level = acme_fblevel_get_level(self);
acme_fblevel_set_level (self, 1);
self->dim = TRUE;
} else if (self->dim == TRUE && val == FALSE) {
acme_fblevel_set_level (self, self->_priv->saved_level);
self->dim = FALSE;
}
}
AcmeFblevel *
acme_fblevel_new (void)
{
AcmeFblevel *self;
int fd, foo;
if (g_file_test ("/dev/pmu", G_FILE_TEST_EXISTS) == FALSE)
return NULL;
if (acme_fblevel_is_powerbook () == FALSE)
return NULL;
self = ACME_FBLEVEL (g_object_new (ACME_TYPE_FBLEVEL, NULL));
/* This function switches the kernel backlight control off.
* This is part of the PPC kernel branch since version
* 2.4.18-rc2-benh. It does nothing with older kernels.
* For those kernels a separate kernel patch is nessecary to
* get backlight control in user space.
*
* Notice nicked from pbbuttons*/
fd = open ("/dev/pmu", O_RDWR);
/* We can't emit the signal yet, the signal isn't connected! */
if (fd < 0)
return NULL;
foo = ioctl(fd, PMU_IOC_GRAB_BACKLIGHT, 0);
self->_priv->pmu_fd = fd;
return self;
}
gboolean
acme_fblevel_is_powerbook (void)
{
FILE *fd;
char str[2048];
gboolean found = FALSE;
fd = fopen ("/proc/cpuinfo", "r");
while (!feof (fd) && found == FALSE)
{
fread (str, 1, 2048, fd);
if (strstr (str, "PowerBook") != NULL)
found = TRUE;
}
fclose (fd);
return found;
}
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