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- // SPDX-License-Identifier: GPL-2.0+
- /*
- * Copyright (C) 2017, STMicroelectronics - All Rights Reserved
- * Author: Patrick Delaunay <patrick.delaunay@st.com>
- */
- #include <common.h>
- #include <dm.h>
- #include <backlight.h>
- #include <log.h>
- #include <asm/gpio.h>
- 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),
- };
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