mirror of
https://github.com/AsahiLinux/u-boot
synced 2024-11-30 08:31:03 +00:00
6fff52b93a
This patch support exynos pwm backlight driver. It can control backlight power and brightness by using pwm. Signed-off-by: Donghwa Lee <dh09.lee@samsung.com> Signed-off-by: Kyungmin Park <kyungmin.park@samsung.com> Signed-off-by: Minkyu Kang <mk7.kang@samsung.com>
57 lines
1.6 KiB
C
57 lines
1.6 KiB
C
/*
|
|
* PWM BACKLIGHT driver for Board based on EXYNOS.
|
|
*
|
|
* Author: Donghwa Lee <dh09.lee@samsung.com>
|
|
*
|
|
* Derived from linux/drivers/video/backlight/pwm_backlight.c
|
|
*
|
|
* 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.
|
|
*
|
|
* You should have received a copy of the GNU General Public License along
|
|
* with this program; if not, write to the Free Software Foundation, Inc.,
|
|
* 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
|
|
*/
|
|
|
|
#include <common.h>
|
|
#include <pwm.h>
|
|
#include <linux/types.h>
|
|
#include <asm/io.h>
|
|
#include <asm/arch/cpu.h>
|
|
#include <asm/arch/gpio.h>
|
|
#include <asm/arch/pwm.h>
|
|
#include <asm/arch/pwm_backlight.h>
|
|
|
|
static struct pwm_backlight_data *pwm;
|
|
|
|
static int exynos_pwm_backlight_update_status(void)
|
|
{
|
|
int brightness = pwm->brightness;
|
|
int max = pwm->max_brightness;
|
|
|
|
if (brightness == 0) {
|
|
pwm_config(pwm->pwm_id, 0, pwm->period);
|
|
pwm_disable(pwm->pwm_id);
|
|
} else {
|
|
pwm_config(pwm->pwm_id,
|
|
brightness * pwm->period / max, pwm->period);
|
|
pwm_enable(pwm->pwm_id);
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
int exynos_pwm_backlight_init(struct pwm_backlight_data *pd)
|
|
{
|
|
pwm = pd;
|
|
|
|
exynos_pwm_backlight_update_status();
|
|
|
|
return 0;
|
|
}
|