LXR uboot/drivers/video/exynos/exynos_pwm

   1// SPDX-License-Identifier: GPL-2.0+
   2/*
   3 * PWM BACKLIGHT driver for Board based on EXYNOS.
   4 *
   5 * Author: Donghwa Lee  <dh09.lee@samsung.com>
   6 *
   7 * Derived from linux/drivers/video/backlight/pwm_backlight.c
   8 */
   9
  10#include <common.h>
  11#include <pwm.h>
  12#include <linux/types.h>
  13#include <asm/io.h>
  14#include <asm/arch/cpu.h>
  15#include <asm/arch/gpio.h>
  16#include <asm/arch/pwm.h>
  17#include <asm/arch/pwm_backlight.h>
  18
  19static struct pwm_backlight_data *pwm;
  20
  21static int exynos_pwm_backlight_update_status(void)
  22{
  23        int brightness = pwm->brightness;
  24        int max = pwm->max_brightness;
  25
  26        if (brightness == 0) {
  27                pwm_config(pwm->pwm_id, 0, pwm->period);
  28                pwm_disable(pwm->pwm_id);
  29        } else {
  30                pwm_config(pwm->pwm_id,
  31                        brightness * pwm->period / max, pwm->period);
  32                pwm_enable(pwm->pwm_id);
  33        }
  34        return 0;
  35}
  36
  37int exynos_pwm_backlight_init(struct pwm_backlight_data *pd)
  38{
  39        pwm = pd;
  40
  41        exynos_pwm_backlight_update_status();
  42
  43        return 0;
  44}
  45