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
|
/*
* Copyright (C) 2014 Freescale Semiconductor, Inc. All Rights Reserved.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
* You should have received a copy of the GNU General Public License along
* with this program; if not, write to the Free Software Foundation, Inc.,
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*/
#include <linux/device.h>
#include <linux/err.h>
#include <linux/init.h>
#include <linux/module.h>
#include <linux/of.h>
#include <linux/of_gpio.h>
#include <linux/platform_device.h>
#define DRIVER_NAME "hannstar-cabc"
static const struct of_device_id cabc_dt_ids[] = {
{ .compatible = "hannstar,cabc", },
{ /* sentinel */ }
};
MODULE_DEVICE_TABLE(of, cabc_dt_ids);
static int cabc_probe(struct platform_device *pdev)
{
struct device_node *np = pdev->dev.of_node, *pp;
int cabc_gpio, ret = 0;
bool cabc_enable;
unsigned long gpio_flag;
enum of_gpio_flags flags;
for_each_child_of_node(np, pp) {
if (!of_find_property(pp, "gpios", NULL)) {
dev_warn(&pdev->dev, "Found interface without "
"gpios\n");
continue;
}
cabc_gpio = of_get_gpio_flags(pp, 0, &flags);
if (!gpio_is_valid(cabc_gpio)) {
ret = cabc_gpio;
if (ret != -EPROBE_DEFER)
dev_err(&pdev->dev,
"Failed to get gpio flags, "
"error: %d\n", ret);
return ret;
}
cabc_enable = of_property_read_bool(pp, "cabc-enable");
if (flags & OF_GPIO_ACTIVE_LOW)
gpio_flag = cabc_enable ?
GPIOF_OUT_INIT_LOW : GPIOF_OUT_INIT_HIGH;
else
gpio_flag = cabc_enable ?
GPIOF_OUT_INIT_HIGH : GPIOF_OUT_INIT_LOW;
devm_gpio_request_one(&pdev->dev, cabc_gpio,
gpio_flag, "hannstar-cabc");
}
return ret;
}
static struct platform_driver cabc_driver = {
.probe = cabc_probe,
.driver = {
.of_match_table = cabc_dt_ids,
.name = DRIVER_NAME,
.owner = THIS_MODULE,
},
};
module_platform_driver(cabc_driver);
MODULE_AUTHOR("Freescale Semiconductor, Inc.");
MODULE_DESCRIPTION("Hannstar CABC driver");
MODULE_LICENSE("GPL");
MODULE_ALIAS("platform:" DRIVER_NAME);
|
