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/*
* Copyright (C) 2010 Michael Buesch <m@bues.ch>
*
* 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.
*
* This program 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 General Public License for more details.
*/
#include "backlight_omapfb.h"
#include "fileaccess.h"
#include "log.h"
#include "util.h"
#include <string.h>
#define BASEPATH "/devices/platform/omapfb/panel"
static int omapfb_write_brightness(struct backlight_omapfb *bo)
{
int err, level;
if (bo->locked)
level = 0;
else
level = bo->current_level;
err = file_write_int(bo->level_file, level, 10);
if (err)
return err;
return 0;
}
static int backlight_omapfb_max_brightness(struct backlight *b)
{
struct backlight_omapfb *bo = container_of(b, struct backlight_omapfb, backlight);
return bo->max_level;
}
static int backlight_omapfb_current_brightness(struct backlight *b)
{
struct backlight_omapfb *bo = container_of(b, struct backlight_omapfb, backlight);
return bo->current_level;
}
static int backlight_omapfb_set_brightness(struct backlight *b, int value)
{
struct backlight_omapfb *bo = container_of(b, struct backlight_omapfb, backlight);
int err;
value = min(b->max_brightness(b), value);
value = max(b->min_brightness(b), value);
if (value == bo->current_level)
return 0;
bo->current_level = value;
err = omapfb_write_brightness(bo);
backlight_notify_state_change(b);
return err;
}
static int backlight_omapfb_screen_lock(struct backlight *b, int lock)
{
struct backlight_omapfb *bo = container_of(b, struct backlight_omapfb, backlight);
int err;
lock = !!lock;
if (lock == bo->locked)
return 0;
bo->locked = lock;
err = omapfb_write_brightness(bo);
if (err)
return err;
backlight_notify_state_change(b);
return 0;
}
static int backlight_omapfb_screen_is_locked(struct backlight *b)
{
struct backlight_omapfb *bo = container_of(b, struct backlight_omapfb, backlight);
return bo->locked;
}
static int backlight_omapfb_read_file(struct backlight_omapfb *bo)
{
int err, value;
err = file_read_int(bo->level_file, &value, 0);
if (err) {
logerr("WARNING: Failed to read backlight level file\n");
return err;
}
bo->current_level = value;
return 0;
}
static void backlight_omapfb_destroy(struct backlight *b)
{
struct backlight_omapfb *bo = container_of(b, struct backlight_omapfb, backlight);
file_close(bo->level_file);
free(bo);
}
static struct backlight * backlight_omapfb_probe(void)
{
struct backlight_omapfb *bo;
struct fileaccess *file, *level_file;
int max_level;
int err;
file = sysfs_file_open(O_RDONLY, "%s/backlight_max", BASEPATH);
if (!file)
goto error;
err = file_read_int(file, &max_level, 0);
file_close(file);
if (err)
goto error;
level_file = sysfs_file_open(O_RDWR, "%s/backlight_level", BASEPATH);
if (!level_file)
goto error;
bo = zalloc(sizeof(*bo));
if (!bo)
goto err_close;
bo->level_file = level_file;
bo->max_level = max_level;
backlight_init(&bo->backlight, "omapfb");
bo->backlight.max_brightness = backlight_omapfb_max_brightness;
bo->backlight.current_brightness = backlight_omapfb_current_brightness;
bo->backlight.set_brightness = backlight_omapfb_set_brightness;
bo->backlight.screen_lock = backlight_omapfb_screen_lock;
bo->backlight.screen_is_locked = backlight_omapfb_screen_is_locked;
bo->backlight.destroy = backlight_omapfb_destroy;
err = backlight_omapfb_read_file(bo);
if (err)
goto err_free;
backlight_notify_state_change(&bo->backlight);
return &bo->backlight;
err_free:
free(bo);
err_close:
file_close(level_file);
error:
return NULL;
}
BACKLIGHT_PROBE(omapfb, backlight_omapfb_probe);
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