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video: support exynos pwm backlight driver 

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>
This commit is contained in:
Donghwa Lee 2012-07-02 01:16:13 +00:00 committed by Albert ARIBAUD
parent a29c832263
commit 6fff52b93a
3 changed files with 92 additions and 0 deletions
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34
arch/arm/include/asm/arch-exynos/pwm_backlight.h Normal file
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@ -0,0 +1,34 @@
/*
* Copyright (C) 2012 Samsung Electronics
*
* Author: Donghwa Lee <dh09.lee@samsung.com>
*
* 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
*/
#ifndef _PWM_BACKLIGHT_H_
#define _PWM_BACKLIGHT_H_
struct pwm_backlight_data {
int pwm_id;
int period;
int max_brightness;
int brightness;
};
extern int exynos_pwm_backlight_init(struct pwm_backlight_data *pd);
#endif /* _PWM_BACKLIGHT_H_ */

1
drivers/video/Makefile
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@ -33,6 +33,7 @@ COBJS-$(CONFIG_EXYNOS_DP) += exynos_dp.o exynos_dp_lowlevel.o
COBJS-$(CONFIG_EXYNOS_FB) += exynos_fb.o exynos_fimd.o
COBJS-$(CONFIG_EXYNOS_MIPI_DSIM) += exynos_mipi_dsi.o exynos_mipi_dsi_common.o \
exynos_mipi_dsi_lowlevel.o
COBJS-$(CONFIG_EXYNOS_PWM_BL) += exynos_pwm_bl.o
COBJS-$(CONFIG_FSL_DIU_FB) += fsl_diu_fb.o videomodes.o
COBJS-$(CONFIG_S6E8AX0) += s6e8ax0.o
COBJS-$(CONFIG_S6E63D6) += s6e63d6.o

57
drivers/video/exynos_pwm_bl.c Normal file
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@ -0,0 +1,57 @@
/*
* 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;
}