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https://github.com/AsahiLinux/u-boot
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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
/*
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* PWM BACKLIGHT driver for Board based on EXYNOS.
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*
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* Author: Donghwa Lee <dh09.lee@samsung.com>
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*
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* Derived from linux/drivers/video/backlight/pwm_backlight.c
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License as published by the
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* Free Software Foundation; either version 2 of the License, or (at your
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* option) any later version.
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*
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* This program is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License along
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* with this program; if not, write to the Free Software Foundation, Inc.,
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* 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
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*/
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#include <common.h>
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#include <pwm.h>
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#include <linux/types.h>
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#include <asm/io.h>
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#include <asm/arch/cpu.h>
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#include <asm/arch/gpio.h>
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#include <asm/arch/pwm.h>
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#include <asm/arch/pwm_backlight.h>
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static struct pwm_backlight_data *pwm;
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static int exynos_pwm_backlight_update_status(void)
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{
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int brightness = pwm->brightness;
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int max = pwm->max_brightness;
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if (brightness == 0) {
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pwm_config(pwm->pwm_id, 0, pwm->period);
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pwm_disable(pwm->pwm_id);
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} else {
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pwm_config(pwm->pwm_id,
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brightness * pwm->period / max, pwm->period);
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pwm_enable(pwm->pwm_id);
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}
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return 0;
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}
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int exynos_pwm_backlight_init(struct pwm_backlight_data *pd)
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{
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pwm = pd;
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exynos_pwm_backlight_update_status();
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return 0;
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}
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