1 // SPDX-License-Identifier: GPL-2.0+
2 /*
3 * Copyright (C) 2017, STMicroelectronics - All Rights Reserved
4 * Author: Patrick Delaunay <patrick.delaunay@foss.st.com>
5 */
6
7 #include <common.h>
8 #include <dm.h>
9 #include <backlight.h>
10 #include <log.h>
11 #include <asm/gpio.h>
12
13 struct gpio_backlight_priv {
14 struct gpio_desc gpio;
15 bool def_value;
16 };
17
gpio_backlight_enable(struct udevice * dev)18 static int gpio_backlight_enable(struct udevice *dev)
19 {
20 struct gpio_backlight_priv *priv = dev_get_priv(dev);
21
22 dm_gpio_set_value(&priv->gpio, 1);
23
24 return 0;
25 }
26
gpio_backlight_of_to_plat(struct udevice * dev)27 static int gpio_backlight_of_to_plat(struct udevice *dev)
28 {
29 struct gpio_backlight_priv *priv = dev_get_priv(dev);
30 int ret;
31
32 ret = gpio_request_by_name(dev, "gpios", 0, &priv->gpio,
33 GPIOD_IS_OUT);
34 if (ret) {
35 debug("%s: Warning: cannot get GPIO: ret=%d\n",
36 __func__, ret);
37 return ret;
38 }
39
40 priv->def_value = dev_read_bool(dev, "default-on");
41
42 return 0;
43 }
44
gpio_backlight_probe(struct udevice * dev)45 static int gpio_backlight_probe(struct udevice *dev)
46 {
47 struct gpio_backlight_priv *priv = dev_get_priv(dev);
48
49 if (priv->def_value)
50 gpio_backlight_enable(dev);
51
52 return 0;
53 }
54
55 static const struct backlight_ops gpio_backlight_ops = {
56 .enable = gpio_backlight_enable,
57 };
58
59 static const struct udevice_id gpio_backlight_ids[] = {
60 { .compatible = "gpio-backlight" },
61 { }
62 };
63
64 U_BOOT_DRIVER(gpio_backlight) = {
65 .name = "gpio_backlight",
66 .id = UCLASS_PANEL_BACKLIGHT,
67 .of_match = gpio_backlight_ids,
68 .ops = &gpio_backlight_ops,
69 .of_to_plat = gpio_backlight_of_to_plat,
70 .probe = gpio_backlight_probe,
71 .priv_auto = sizeof(struct gpio_backlight_priv),
72 };
73