1 // SPDX-License-Identifier: GPL-2.0+
2 /*
3 * Copyright (c) 2016 Google, Inc
4 * Written by Simon Glass <sjg@chromium.org>
5 */
6
7 #include <common.h>
8 #include <backlight.h>
9 #include <dm.h>
10 #include <panel.h>
11 #include <asm/gpio.h>
12 #include <power/regulator.h>
13
14 struct simple_panel_priv {
15 struct udevice *reg;
16 struct udevice *backlight;
17 struct gpio_desc enable;
18 };
19
simple_panel_enable_backlight(struct udevice * dev)20 static int simple_panel_enable_backlight(struct udevice *dev)
21 {
22 struct simple_panel_priv *priv = dev_get_priv(dev);
23 int ret;
24
25 debug("%s: start, backlight = '%s'\n", __func__, priv->backlight->name);
26 dm_gpio_set_value(&priv->enable, 1);
27 ret = backlight_enable(priv->backlight);
28 debug("%s: done, ret = %d\n", __func__, ret);
29 if (ret)
30 return ret;
31
32 return 0;
33 }
34
simple_panel_set_backlight(struct udevice * dev,int percent)35 static int simple_panel_set_backlight(struct udevice *dev, int percent)
36 {
37 struct simple_panel_priv *priv = dev_get_priv(dev);
38 int ret;
39
40 debug("%s: start, backlight = '%s'\n", __func__, priv->backlight->name);
41 dm_gpio_set_value(&priv->enable, 1);
42 ret = backlight_set_brightness(priv->backlight, percent);
43 debug("%s: done, ret = %d\n", __func__, ret);
44 if (ret)
45 return ret;
46
47 return 0;
48 }
49
simple_panel_ofdata_to_platdata(struct udevice * dev)50 static int simple_panel_ofdata_to_platdata(struct udevice *dev)
51 {
52 struct simple_panel_priv *priv = dev_get_priv(dev);
53 int ret;
54
55 if (IS_ENABLED(CONFIG_DM_REGULATOR)) {
56 ret = uclass_get_device_by_phandle(UCLASS_REGULATOR, dev,
57 "power-supply", &priv->reg);
58 if (ret) {
59 debug("%s: Warning: cannot get power supply: ret=%d\n",
60 __func__, ret);
61 if (ret != -ENOENT)
62 return ret;
63 }
64 }
65 ret = uclass_get_device_by_phandle(UCLASS_PANEL_BACKLIGHT, dev,
66 "backlight", &priv->backlight);
67 if (ret) {
68 debug("%s: Cannot get backlight: ret=%d\n", __func__, ret);
69 return log_ret(ret);
70 }
71 ret = gpio_request_by_name(dev, "enable-gpios", 0, &priv->enable,
72 GPIOD_IS_OUT);
73 if (ret) {
74 debug("%s: Warning: cannot get enable GPIO: ret=%d\n",
75 __func__, ret);
76 if (ret != -ENOENT)
77 return log_ret(ret);
78 }
79
80 return 0;
81 }
82
simple_panel_probe(struct udevice * dev)83 static int simple_panel_probe(struct udevice *dev)
84 {
85 struct simple_panel_priv *priv = dev_get_priv(dev);
86 int ret;
87
88 if (IS_ENABLED(CONFIG_DM_REGULATOR) && priv->reg) {
89 debug("%s: Enable regulator '%s'\n", __func__, priv->reg->name);
90 ret = regulator_set_enable(priv->reg, true);
91 if (ret)
92 return ret;
93 }
94
95 return 0;
96 }
97
98 static const struct panel_ops simple_panel_ops = {
99 .enable_backlight = simple_panel_enable_backlight,
100 .set_backlight = simple_panel_set_backlight,
101 };
102
103 static const struct udevice_id simple_panel_ids[] = {
104 { .compatible = "simple-panel" },
105 { .compatible = "auo,b133xtn01" },
106 { .compatible = "auo,b116xw03" },
107 { .compatible = "auo,b133htn01" },
108 { }
109 };
110
111 U_BOOT_DRIVER(simple_panel) = {
112 .name = "simple_panel",
113 .id = UCLASS_PANEL,
114 .of_match = simple_panel_ids,
115 .ops = &simple_panel_ops,
116 .ofdata_to_platdata = simple_panel_ofdata_to_platdata,
117 .probe = simple_panel_probe,
118 .priv_auto_alloc_size = sizeof(struct simple_panel_priv),
119 };
120