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