From e44e3482bdb4d0ebde2d8b41830ac2cdb07948fb Mon Sep 17 00:00:00 2001 From: Yang Zhang Date: Fri, 28 Aug 2015 09:58:54 +0800 Subject: Add qemu 2.4.0 Change-Id: Ic99cbad4b61f8b127b7dc74d04576c0bcbaaf4f5 Signed-off-by: Yang Zhang --- qemu/roms/u-boot/drivers/video/exynos_pwm_bl.c | 45 ++++++++++++++++++++++++++ 1 file changed, 45 insertions(+) create mode 100644 qemu/roms/u-boot/drivers/video/exynos_pwm_bl.c (limited to 'qemu/roms/u-boot/drivers/video/exynos_pwm_bl.c') diff --git a/qemu/roms/u-boot/drivers/video/exynos_pwm_bl.c b/qemu/roms/u-boot/drivers/video/exynos_pwm_bl.c new file mode 100644 index 000000000..a6890daf2 --- /dev/null +++ b/qemu/roms/u-boot/drivers/video/exynos_pwm_bl.c @@ -0,0 +1,45 @@ +/* + * PWM BACKLIGHT driver for Board based on EXYNOS. + * + * Author: Donghwa Lee + * + * Derived from linux/drivers/video/backlight/pwm_backlight.c + * + * SPDX-License-Identifier: GPL-2.0+ + */ + +#include +#include +#include +#include +#include +#include +#include +#include + +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; +} -- cgit 1.2.3-korg