mirror of
https://github.com/AsahiLinux/u-boot
synced 2024-11-11 07:34:31 +00:00
5b6a6a91c8
Add a driver for GPIO backlights. It understands the standard device tree binding. It can be used with simple-panel when PWM is not necessary. Signed-off-by: Patrick Delaunay <patrick.delaunay@st.com>
74 lines
1.5 KiB
C
74 lines
1.5 KiB
C
/*
|
|
* Copyright (C) 2017, STMicroelectronics - All Rights Reserved
|
|
* Author: Patrick Delaunay <patrick.delaunay@st.com>
|
|
*
|
|
* SPDX-License-Identifier: GPL-2.0+
|
|
*/
|
|
|
|
#include <common.h>
|
|
#include <dm.h>
|
|
#include <backlight.h>
|
|
#include <asm/gpio.h>
|
|
|
|
DECLARE_GLOBAL_DATA_PTR;
|
|
|
|
struct gpio_backlight_priv {
|
|
struct gpio_desc gpio;
|
|
bool def_value;
|
|
};
|
|
|
|
static int gpio_backlight_enable(struct udevice *dev)
|
|
{
|
|
struct gpio_backlight_priv *priv = dev_get_priv(dev);
|
|
|
|
dm_gpio_set_value(&priv->gpio, 1);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int gpio_backlight_ofdata_to_platdata(struct udevice *dev)
|
|
{
|
|
struct gpio_backlight_priv *priv = dev_get_priv(dev);
|
|
int ret;
|
|
|
|
ret = gpio_request_by_name(dev, "gpios", 0, &priv->gpio,
|
|
GPIOD_IS_OUT);
|
|
if (ret) {
|
|
debug("%s: Warning: cannot get GPIO: ret=%d\n",
|
|
__func__, ret);
|
|
return ret;
|
|
}
|
|
|
|
priv->def_value = dev_read_bool(dev, "default-on");
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int gpio_backlight_probe(struct udevice *dev)
|
|
{
|
|
struct gpio_backlight_priv *priv = dev_get_priv(dev);
|
|
|
|
if (priv->def_value)
|
|
gpio_backlight_enable(dev);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static const struct backlight_ops gpio_backlight_ops = {
|
|
.enable = gpio_backlight_enable,
|
|
};
|
|
|
|
static const struct udevice_id gpio_backlight_ids[] = {
|
|
{ .compatible = "gpio-backlight" },
|
|
{ }
|
|
};
|
|
|
|
U_BOOT_DRIVER(gpio_backlight) = {
|
|
.name = "gpio_backlight",
|
|
.id = UCLASS_PANEL_BACKLIGHT,
|
|
.of_match = gpio_backlight_ids,
|
|
.ops = &gpio_backlight_ops,
|
|
.ofdata_to_platdata = gpio_backlight_ofdata_to_platdata,
|
|
.probe = gpio_backlight_probe,
|
|
.priv_auto_alloc_size = sizeof(struct gpio_backlight_priv),
|
|
};
|