blob: 67fed7f224a309701aadcac10364ed478c1df73d [file] [log] [blame]
Tom Rini83d290c2018-05-06 17:58:06 -04001// SPDX-License-Identifier: GPL-2.0+
Patrick Delaunay5b6a6a92017-08-03 12:36:07 +02002/*
3 * Copyright (C) 2017, STMicroelectronics - All Rights Reserved
4 * Author: Patrick Delaunay <patrick.delaunay@st.com>
Patrick Delaunay5b6a6a92017-08-03 12:36:07 +02005 */
6
7#include <common.h>
8#include <dm.h>
9#include <backlight.h>
Simon Glassf7ae49f2020-05-10 11:40:05 -060010#include <log.h>
Patrick Delaunay5b6a6a92017-08-03 12:36:07 +020011#include <asm/gpio.h>
12
Patrick Delaunay5b6a6a92017-08-03 12:36:07 +020013struct gpio_backlight_priv {
14 struct gpio_desc gpio;
15 bool def_value;
16};
17
18static 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
27static int gpio_backlight_ofdata_to_platdata(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
45static 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
55static const struct backlight_ops gpio_backlight_ops = {
56 .enable = gpio_backlight_enable,
57};
58
59static const struct udevice_id gpio_backlight_ids[] = {
60 { .compatible = "gpio-backlight" },
61 { }
62};
63
64U_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 .ofdata_to_platdata = gpio_backlight_ofdata_to_platdata,
70 .probe = gpio_backlight_probe,
71 .priv_auto_alloc_size = sizeof(struct gpio_backlight_priv),
72};