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
12 struct gpio_backlight_priv {
13 struct gpio_desc gpio;
14 bool def_value;
15 };
16
gpio_backlight_enable(struct udevice * dev)17 static 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
gpio_backlight_ofdata_to_platdata(struct udevice * dev)26 static 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
gpio_backlight_probe(struct udevice * dev)44 static 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
54 static const struct backlight_ops gpio_backlight_ops = {
55 .enable = gpio_backlight_enable,
56 };
57
58 static const struct udevice_id gpio_backlight_ids[] = {
59 { .compatible = "gpio-backlight" },
60 { }
61 };
62
63 U_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