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
|
// SPDX-License-Identifier: GPL-2.0-only
/*
* Copyright (c) 2014, National Instruments Corp. All rights reserved.
*
* Driver for NI Ettus Research USRP E3x0 Button Driver
*/
#include <linux/device.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/platform_device.h>
#include <linux/input.h>
#include <linux/interrupt.h>
#include <linux/of.h>
#include <linux/slab.h>
static irqreturn_t e3x0_button_release_handler(int irq, void *data)
{
struct input_dev *idev = data;
input_report_key(idev, KEY_POWER, 0);
input_sync(idev);
return IRQ_HANDLED;
}
static irqreturn_t e3x0_button_press_handler(int irq, void *data)
{
struct input_dev *idev = data;
input_report_key(idev, KEY_POWER, 1);
pm_wakeup_event(idev->dev.parent, 0);
input_sync(idev);
return IRQ_HANDLED;
}
static int e3x0_button_suspend(struct device *dev)
{
struct platform_device *pdev = to_platform_device(dev);
if (device_may_wakeup(dev))
enable_irq_wake(platform_get_irq_byname(pdev, "press"));
return 0;
}
static int e3x0_button_resume(struct device *dev)
{
struct platform_device *pdev = to_platform_device(dev);
if (device_may_wakeup(dev))
disable_irq_wake(platform_get_irq_byname(pdev, "press"));
return 0;
}
static DEFINE_SIMPLE_DEV_PM_OPS(e3x0_button_pm_ops,
e3x0_button_suspend, e3x0_button_resume);
static int e3x0_button_probe(struct platform_device *pdev)
{
struct input_dev *input;
int irq_press, irq_release;
int error;
irq_press = platform_get_irq_byname(pdev, "press");
if (irq_press < 0)
return irq_press;
irq_release = platform_get_irq_byname(pdev, "release");
if (irq_release < 0)
return irq_release;
input = devm_input_allocate_device(&pdev->dev);
if (!input)
return -ENOMEM;
input->name = "NI Ettus Research USRP E3x0 Button Driver";
input->phys = "e3x0_button/input0";
input->dev.parent = &pdev->dev;
input_set_capability(input, EV_KEY, KEY_POWER);
error = devm_request_irq(&pdev->dev, irq_press,
e3x0_button_press_handler, 0,
"e3x0-button", input);
if (error) {
dev_err(&pdev->dev, "Failed to request 'press' IRQ#%d: %d\n",
irq_press, error);
return error;
}
error = devm_request_irq(&pdev->dev, irq_release,
e3x0_button_release_handler, 0,
"e3x0-button", input);
if (error) {
dev_err(&pdev->dev, "Failed to request 'release' IRQ#%d: %d\n",
irq_release, error);
return error;
}
error = input_register_device(input);
if (error) {
dev_err(&pdev->dev, "Can't register input device: %d\n", error);
return error;
}
device_init_wakeup(&pdev->dev, 1);
return 0;
}
#ifdef CONFIG_OF
static const struct of_device_id e3x0_button_match[] = {
{ .compatible = "ettus,e3x0-button", },
{ }
};
MODULE_DEVICE_TABLE(of, e3x0_button_match);
#endif
static struct platform_driver e3x0_button_driver = {
.driver = {
.name = "e3x0-button",
.of_match_table = of_match_ptr(e3x0_button_match),
.pm = pm_sleep_ptr(&e3x0_button_pm_ops),
},
.probe = e3x0_button_probe,
};
module_platform_driver(e3x0_button_driver);
MODULE_LICENSE("GPL v2");
MODULE_AUTHOR("Moritz Fischer <moritz.fischer@ettus.com>");
MODULE_DESCRIPTION("NI Ettus Research USRP E3x0 Button driver");
MODULE_ALIAS("platform:e3x0-button");
|
