tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
1// SPDX-License-Identifier: GPL-2.0-only
2/*
3 * Copyright (c) 2014, National Instruments Corp. All rights reserved.
4 *
5 * Driver for NI Ettus Research USRP E3x0 Button Driver
6 */
7
8#include <linux/device.h>
9#include <linux/kernel.h>
10#include <linux/module.h>
11#include <linux/platform_device.h>
12#include <linux/input.h>
13#include <linux/interrupt.h>
14#include <linux/of.h>
15#include <linux/slab.h>
16
17static irqreturn_t e3x0_button_release_handler(int irq, void *data)
18{
19 struct input_dev *idev = data;
20
21 input_report_key(idev, KEY_POWER, 0);
22 input_sync(idev);
23
24 return IRQ_HANDLED;
25}
26
27static irqreturn_t e3x0_button_press_handler(int irq, void *data)
28{
29 struct input_dev *idev = data;
30
31 input_report_key(idev, KEY_POWER, 1);
32 pm_wakeup_event(idev->dev.parent, 0);
33 input_sync(idev);
34
35 return IRQ_HANDLED;
36}
37
38static int __maybe_unused e3x0_button_suspend(struct device *dev)
39{
40 struct platform_device *pdev = to_platform_device(dev);
41
42 if (device_may_wakeup(dev))
43 enable_irq_wake(platform_get_irq_byname(pdev, "press"));
44
45 return 0;
46}
47
48static int __maybe_unused e3x0_button_resume(struct device *dev)
49{
50 struct platform_device *pdev = to_platform_device(dev);
51
52 if (device_may_wakeup(dev))
53 disable_irq_wake(platform_get_irq_byname(pdev, "press"));
54
55 return 0;
56}
57
58static SIMPLE_DEV_PM_OPS(e3x0_button_pm_ops,
59 e3x0_button_suspend, e3x0_button_resume);
60
61static int e3x0_button_probe(struct platform_device *pdev)
62{
63 struct input_dev *input;
64 int irq_press, irq_release;
65 int error;
66
67 irq_press = platform_get_irq_byname(pdev, "press");
68 if (irq_press < 0) {
69 dev_err(&pdev->dev, "No IRQ for 'press', error=%d\n",
70 irq_press);
71 return irq_press;
72 }
73
74 irq_release = platform_get_irq_byname(pdev, "release");
75 if (irq_release < 0) {
76 dev_err(&pdev->dev, "No IRQ for 'release', error=%d\n",
77 irq_release);
78 return irq_release;
79 }
80
81 input = devm_input_allocate_device(&pdev->dev);
82 if (!input)
83 return -ENOMEM;
84
85 input->name = "NI Ettus Research USRP E3x0 Button Driver";
86 input->phys = "e3x0_button/input0";
87 input->dev.parent = &pdev->dev;
88
89 input_set_capability(input, EV_KEY, KEY_POWER);
90
91 error = devm_request_irq(&pdev->dev, irq_press,
92 e3x0_button_press_handler, 0,
93 "e3x0-button", input);
94 if (error) {
95 dev_err(&pdev->dev, "Failed to request 'press' IRQ#%d: %d\n",
96 irq_press, error);
97 return error;
98 }
99
100 error = devm_request_irq(&pdev->dev, irq_release,
101 e3x0_button_release_handler, 0,
102 "e3x0-button", input);
103 if (error) {
104 dev_err(&pdev->dev, "Failed to request 'release' IRQ#%d: %d\n",
105 irq_release, error);
106 return error;
107 }
108
109 error = input_register_device(input);
110 if (error) {
111 dev_err(&pdev->dev, "Can't register input device: %d\n", error);
112 return error;
113 }
114
115 device_init_wakeup(&pdev->dev, 1);
116 return 0;
117}
118
119#ifdef CONFIG_OF
120static const struct of_device_id e3x0_button_match[] = {
121 { .compatible = "ettus,e3x0-button", },
122 { }
123};
124MODULE_DEVICE_TABLE(of, e3x0_button_match);
125#endif
126
127static struct platform_driver e3x0_button_driver = {
128 .driver = {
129 .name = "e3x0-button",
130 .of_match_table = of_match_ptr(e3x0_button_match),
131 .pm = &e3x0_button_pm_ops,
132 },
133 .probe = e3x0_button_probe,
134};
135
136module_platform_driver(e3x0_button_driver);
137
138MODULE_LICENSE("GPL v2");
139MODULE_AUTHOR("Moritz Fischer <moritz.fischer@ettus.com>");
140MODULE_DESCRIPTION("NI Ettus Research USRP E3x0 Button driver");
141MODULE_ALIAS("platform:e3x0-button");