LXR uboot/drivers/video/backlight

   1// SPDX-License-Identifier: GPL-2.0+
   2/*
   3 * Copyright (C) 2017, STMicroelectronics - All Rights Reserved
   4 * Author: Patrick Delaunay <patrick.delaunay@st.com>
   5 */
   6
   7#include <common.h>
   8#include <dm.h>
   9#include <backlight.h>
  10#include <asm/gpio.h>
  11
  12struct gpio_backlight_priv {
  13        struct gpio_desc gpio;
  14        bool def_value;
  15};
  16
  17static int gpio_backlight_enable(struct udevice *dev)
  18{
  19        struct gpio_backlight_priv *priv = dev_get_priv(dev);
  20
  21        dm_gpio_set_value(&priv->gpio, 1);
  22
  23        return 0;
  24}
  25
  26static int gpio_backlight_ofdata_to_platdata(struct udevice *dev)
  27{
  28        struct gpio_backlight_priv *priv = dev_get_priv(dev);
  29        int ret;
  30
  31        ret = gpio_request_by_name(dev, "gpios", 0, &priv->gpio,
  32                                   GPIOD_IS_OUT);
  33        if (ret) {
  34                debug("%s: Warning: cannot get GPIO: ret=%d\n",
  35                      __func__, ret);
  36                return ret;
  37        }
  38
  39        priv->def_value = dev_read_bool(dev, "default-on");
  40
  41        return 0;
  42}
  43
  44static int gpio_backlight_probe(struct udevice *dev)
  45{
  46        struct gpio_backlight_priv *priv = dev_get_priv(dev);
  47
  48        if (priv->def_value)
  49                gpio_backlight_enable(dev);
  50
  51        return 0;
  52}
  53
  54static const struct backlight_ops gpio_backlight_ops = {
  55        .enable = gpio_backlight_enable,
  56};
  57
  58static const struct udevice_id gpio_backlight_ids[] = {
  59        { .compatible = "gpio-backlight" },
  60        { }
  61};
  62
  63U_BOOT_DRIVER(gpio_backlight) = {
  64        .name   = "gpio_backlight",
  65        .id     = UCLASS_PANEL_BACKLIGHT,
  66        .of_match = gpio_backlight_ids,
  67        .ops    = &gpio_backlight_ops,
  68        .ofdata_to_platdata     = gpio_backlight_ofdata_to_platdata,
  69        .probe          = gpio_backlight_probe,
  70        .priv_auto_alloc_size   = sizeof(struct gpio_backlight_priv),
  71};
  72