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 --- arch/arm/include/asm/arch-exynos/pwm_backlight.h | 34 +++++++++++++ drivers/video/Makefile | 1 + drivers/video/exynos_pwm_bl.c | 57 ++++++++++++++++++++++ 3 files changed, 92 insertions(+), 0 deletions(-) create mode 100644 arch/arm/include/asm/arch-exynos/pwm_backlight.h create mode 100644 drivers/video/exynos_pwm_bl.c

diff --git a/arch/arm/include/asm/arch-exynos/pwm_backlight.h b/arch/arm/include/asm/arch-exynos/pwm_backlight.h new file mode 100644 index 0000000..368ffc5 --- /dev/null +++ b/arch/arm/include/asm/arch-exynos/pwm_backlight.h @@ -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_ */ diff --git a/drivers/video/Makefile b/drivers/video/Makefile index a7530a4..4a0a5b4 100644 --- a/drivers/video/Makefile +++ b/drivers/video/Makefile @@ -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 diff --git a/drivers/video/exynos_pwm_bl.c b/drivers/video/exynos_pwm_bl.c new file mode 100644 index 0000000..27fb0b5 --- /dev/null +++ b/drivers/video/exynos_pwm_bl.c @@ -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; +}