mirror of
https://github.com/brain-hackers/u-boot-brain
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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>
75 lines
1.5 KiB
C
75 lines
1.5 KiB
C
/*
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* Copyright (C) 2017, STMicroelectronics - All Rights Reserved
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* Author: Patrick Delaunay <patrick.delaunay@st.com>
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*
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* SPDX-License-Identifier: GPL-2.0+
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*/
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#include <common.h>
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#include <dm.h>
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#include <backlight.h>
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#include <asm/gpio.h>
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DECLARE_GLOBAL_DATA_PTR;
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struct gpio_backlight_priv {
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struct gpio_desc gpio;
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bool def_value;
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};
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static int gpio_backlight_enable(struct udevice *dev)
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{
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struct gpio_backlight_priv *priv = dev_get_priv(dev);
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dm_gpio_set_value(&priv->gpio, 1);
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return 0;
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}
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static int gpio_backlight_ofdata_to_platdata(struct udevice *dev)
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{
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struct gpio_backlight_priv *priv = dev_get_priv(dev);
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int ret;
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ret = gpio_request_by_name(dev, "gpios", 0, &priv->gpio,
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GPIOD_IS_OUT);
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if (ret) {
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debug("%s: Warning: cannot get GPIO: ret=%d\n",
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__func__, ret);
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return ret;
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}
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priv->def_value = dev_read_bool(dev, "default-on");
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return 0;
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}
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static int gpio_backlight_probe(struct udevice *dev)
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{
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struct gpio_backlight_priv *priv = dev_get_priv(dev);
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if (priv->def_value)
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gpio_backlight_enable(dev);
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return 0;
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}
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static const struct backlight_ops gpio_backlight_ops = {
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.enable = gpio_backlight_enable,
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};
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static const struct udevice_id gpio_backlight_ids[] = {
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{ .compatible = "gpio-backlight" },
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{ }
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};
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U_BOOT_DRIVER(gpio_backlight) = {
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.name = "gpio_backlight",
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.id = UCLASS_PANEL_BACKLIGHT,
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.of_match = gpio_backlight_ids,
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.ops = &gpio_backlight_ops,
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.ofdata_to_platdata = gpio_backlight_ofdata_to_platdata,
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.probe = gpio_backlight_probe,
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.priv_auto_alloc_size = sizeof(struct gpio_backlight_priv),
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};
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