1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
|
/*
* Copyright (c) 2006-2023, RT-Thread Development Team
*
* SPDX-License-Identifier: Apache-2.0
*
* Change Logs:
* Date Author Notes
* 2023-02-25 GuEe-GUI the first version
*/
#include <rthw.h>
#include <rtthread.h>
#include <rtdevice.h>
#define DBG_TAG "backlight.gpio"
#define DBG_LVL DBG_INFO
#include <rtdbg.h>
struct gpio_backlight
{
struct rt_backlight_device parent;
rt_base_t pin;
rt_uint8_t active_val;
};
#define raw_to_gpio_backlight(raw) rt_container_of(raw, struct gpio_backlight, parent)
static rt_err_t gpio_backlight_update_status(struct rt_backlight_device *bl)
{
rt_uint8_t brightness;
struct gpio_backlight *gbl = raw_to_gpio_backlight(bl);
rt_pin_mode(gbl->pin, PIN_MODE_OUTPUT);
brightness = rt_backlight_power_brightness(bl);
if (!gbl->active_val)
{
brightness = !brightness;
}
rt_pin_write(gbl->pin, brightness);
return RT_EOK;
}
static struct rt_backlight_ops gpio_backlight_ops =
{
.update_status = gpio_backlight_update_status,
};
static rt_err_t gpio_backlight_probe(struct rt_platform_device *pdev)
{
rt_err_t err;
rt_bool_t def_value;
struct rt_device *dev = &pdev->parent;
struct gpio_backlight *gbl = rt_calloc(1, sizeof(*gbl));
if (!gbl)
{
return -RT_ENOMEM;
}
def_value = rt_dm_dev_prop_read_bool(dev, "default-on");
gbl->pin = rt_pin_get_named_pin(dev, RT_NULL, 0, RT_NULL, &gbl->active_val);
if (gbl->pin < 0)
{
err = gbl->pin;
goto _fail;
}
/* Set the initial power state */
if (!dev->ofw_node || !rt_dm_dev_prop_read_bool(dev, "phandle"))
{
gbl->parent.props.power = def_value ?
RT_BACKLIGHT_POWER_UNBLANK : RT_BACKLIGHT_POWER_POWERDOWN;
}
else if (rt_pin_read(gbl->pin) != gbl->active_val)
{
gbl->parent.props.power = RT_BACKLIGHT_POWER_POWERDOWN;
}
else
{
gbl->parent.props.power = RT_BACKLIGHT_POWER_UNBLANK;
}
gbl->parent.props.max_brightness = 1;
gbl->parent.ops = &gpio_backlight_ops;
if ((err = rt_backlight_register(&gbl->parent)))
{
goto _fail;
}
rt_pin_mode(gbl->pin, PIN_MODE_OUTPUT);
rt_backlight_set_brightness(&gbl->parent, 1);
return RT_EOK;
_fail:
rt_free(gbl);
return err;
}
static rt_err_t gpio_backlight_remove(struct rt_platform_device *pdev)
{
struct gpio_backlight *gbl = pdev->parent.user_data;
rt_backlight_unregister(&gbl->parent);
rt_free(gbl);
return RT_EOK;
}
static const struct rt_ofw_node_id gpio_backlight_ofw_ids[] =
{
{ .compatible = "gpio-backlight" },
{ /* sentinel */ }
};
static struct rt_platform_driver gpio_backlight_driver =
{
.name = "gpio-backlight",
.ids = gpio_backlight_ofw_ids,
.probe = gpio_backlight_probe,
.remove = gpio_backlight_remove,
};
RT_PLATFORM_DRIVER_EXPORT(gpio_backlight_driver);
|
