blob: 772df5d3026d63af097d641578fcd3711dadbfa6 [file] [log] [blame]
Patrick Delaunay5b6a6a92017-08-03 12:36:07 +02001/*
2 * Copyright (C) 2017, STMicroelectronics - All Rights Reserved
3 * Author: Patrick Delaunay <patrick.delaunay@st.com>
4 *
5 * SPDX-License-Identifier: GPL-2.0+
6 */
7
8#include <common.h>
9#include <dm.h>
10#include <backlight.h>
11#include <asm/gpio.h>
12
13DECLARE_GLOBAL_DATA_PTR;
14
15struct gpio_backlight_priv {
16 struct gpio_desc gpio;
17 bool def_value;
18};
19
20static int gpio_backlight_enable(struct udevice *dev)
21{
22 struct gpio_backlight_priv *priv = dev_get_priv(dev);
23
24 dm_gpio_set_value(&priv->gpio, 1);
25
26 return 0;
27}
28
29static int gpio_backlight_ofdata_to_platdata(struct udevice *dev)
30{
31 struct gpio_backlight_priv *priv = dev_get_priv(dev);
32 int ret;
33
34 ret = gpio_request_by_name(dev, "gpios", 0, &priv->gpio,
35 GPIOD_IS_OUT);
36 if (ret) {
37 debug("%s: Warning: cannot get GPIO: ret=%d\n",
38 __func__, ret);
39 return ret;
40 }
41
42 priv->def_value = dev_read_bool(dev, "default-on");
43
44 return 0;
45}
46
47static int gpio_backlight_probe(struct udevice *dev)
48{
49 struct gpio_backlight_priv *priv = dev_get_priv(dev);
50
51 if (priv->def_value)
52 gpio_backlight_enable(dev);
53
54 return 0;
55}
56
57static const struct backlight_ops gpio_backlight_ops = {
58 .enable = gpio_backlight_enable,
59};
60
61static const struct udevice_id gpio_backlight_ids[] = {
62 { .compatible = "gpio-backlight" },
63 { }
64};
65
66U_BOOT_DRIVER(gpio_backlight) = {
67 .name = "gpio_backlight",
68 .id = UCLASS_PANEL_BACKLIGHT,
69 .of_match = gpio_backlight_ids,
70 .ops = &gpio_backlight_ops,
71 .ofdata_to_platdata = gpio_backlight_ofdata_to_platdata,
72 .probe = gpio_backlight_probe,
73 .priv_auto_alloc_size = sizeof(struct gpio_backlight_priv),
74};