1*4882a593Smuzhiyun /*
2*4882a593Smuzhiyun * Copyright (C) 2017, STMicroelectronics - All Rights Reserved
3*4882a593Smuzhiyun * Author: Patrick Delaunay <patrick.delaunay@st.com>
4*4882a593Smuzhiyun *
5*4882a593Smuzhiyun * SPDX-License-Identifier: GPL-2.0+
6*4882a593Smuzhiyun */
7*4882a593Smuzhiyun
8*4882a593Smuzhiyun #include <common.h>
9*4882a593Smuzhiyun #include <dm.h>
10*4882a593Smuzhiyun #include <backlight.h>
11*4882a593Smuzhiyun #include <asm/gpio.h>
12*4882a593Smuzhiyun
13*4882a593Smuzhiyun DECLARE_GLOBAL_DATA_PTR;
14*4882a593Smuzhiyun
15*4882a593Smuzhiyun struct gpio_backlight_priv {
16*4882a593Smuzhiyun struct gpio_desc gpio;
17*4882a593Smuzhiyun bool def_value;
18*4882a593Smuzhiyun };
19*4882a593Smuzhiyun
gpio_backlight_enable(struct udevice * dev)20*4882a593Smuzhiyun static int gpio_backlight_enable(struct udevice *dev)
21*4882a593Smuzhiyun {
22*4882a593Smuzhiyun struct gpio_backlight_priv *priv = dev_get_priv(dev);
23*4882a593Smuzhiyun
24*4882a593Smuzhiyun dm_gpio_set_value(&priv->gpio, 1);
25*4882a593Smuzhiyun
26*4882a593Smuzhiyun return 0;
27*4882a593Smuzhiyun }
28*4882a593Smuzhiyun
gpio_backlight_ofdata_to_platdata(struct udevice * dev)29*4882a593Smuzhiyun static int gpio_backlight_ofdata_to_platdata(struct udevice *dev)
30*4882a593Smuzhiyun {
31*4882a593Smuzhiyun struct gpio_backlight_priv *priv = dev_get_priv(dev);
32*4882a593Smuzhiyun int ret;
33*4882a593Smuzhiyun
34*4882a593Smuzhiyun ret = gpio_request_by_name(dev, "gpios", 0, &priv->gpio,
35*4882a593Smuzhiyun GPIOD_IS_OUT);
36*4882a593Smuzhiyun if (ret) {
37*4882a593Smuzhiyun debug("%s: Warning: cannot get GPIO: ret=%d\n",
38*4882a593Smuzhiyun __func__, ret);
39*4882a593Smuzhiyun return ret;
40*4882a593Smuzhiyun }
41*4882a593Smuzhiyun
42*4882a593Smuzhiyun priv->def_value = dev_read_bool(dev, "default-on");
43*4882a593Smuzhiyun
44*4882a593Smuzhiyun return 0;
45*4882a593Smuzhiyun }
46*4882a593Smuzhiyun
gpio_backlight_probe(struct udevice * dev)47*4882a593Smuzhiyun static int gpio_backlight_probe(struct udevice *dev)
48*4882a593Smuzhiyun {
49*4882a593Smuzhiyun struct gpio_backlight_priv *priv = dev_get_priv(dev);
50*4882a593Smuzhiyun
51*4882a593Smuzhiyun if (priv->def_value)
52*4882a593Smuzhiyun gpio_backlight_enable(dev);
53*4882a593Smuzhiyun
54*4882a593Smuzhiyun return 0;
55*4882a593Smuzhiyun }
56*4882a593Smuzhiyun
57*4882a593Smuzhiyun static const struct backlight_ops gpio_backlight_ops = {
58*4882a593Smuzhiyun .enable = gpio_backlight_enable,
59*4882a593Smuzhiyun };
60*4882a593Smuzhiyun
61*4882a593Smuzhiyun static const struct udevice_id gpio_backlight_ids[] = {
62*4882a593Smuzhiyun { .compatible = "gpio-backlight" },
63*4882a593Smuzhiyun { }
64*4882a593Smuzhiyun };
65*4882a593Smuzhiyun
66*4882a593Smuzhiyun U_BOOT_DRIVER(gpio_backlight) = {
67*4882a593Smuzhiyun .name = "gpio_backlight",
68*4882a593Smuzhiyun .id = UCLASS_PANEL_BACKLIGHT,
69*4882a593Smuzhiyun .of_match = gpio_backlight_ids,
70*4882a593Smuzhiyun .ops = &gpio_backlight_ops,
71*4882a593Smuzhiyun .ofdata_to_platdata = gpio_backlight_ofdata_to_platdata,
72*4882a593Smuzhiyun .probe = gpio_backlight_probe,
73*4882a593Smuzhiyun .priv_auto_alloc_size = sizeof(struct gpio_backlight_priv),
74*4882a593Smuzhiyun };
75