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 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 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 DEFINE_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		return irq_press;
70
71	irq_release = platform_get_irq_byname(pdev, "release");
72	if (irq_release < 0)
73		return irq_release;
74
75	input = devm_input_allocate_device(&pdev->dev);
76	if (!input)
77		return -ENOMEM;
78
79	input->name = "NI Ettus Research USRP E3x0 Button Driver";
80	input->phys = "e3x0_button/input0";
81	input->dev.parent = &pdev->dev;
82
83	input_set_capability(input, EV_KEY, KEY_POWER);
84
85	error = devm_request_irq(&pdev->dev, irq_press,
86				 e3x0_button_press_handler, 0,
87				 "e3x0-button", input);
88	if (error) {
89		dev_err(&pdev->dev, "Failed to request 'press' IRQ#%d: %d\n",
90			irq_press, error);
91		return error;
92	}
93
94	error = devm_request_irq(&pdev->dev, irq_release,
95				 e3x0_button_release_handler, 0,
96				 "e3x0-button", input);
97	if (error) {
98		dev_err(&pdev->dev, "Failed to request 'release' IRQ#%d: %d\n",
99			irq_release, error);
100		return error;
101	}
102
103	error = input_register_device(input);
104	if (error) {
105		dev_err(&pdev->dev, "Can't register input device: %d\n", error);
106		return error;
107	}
108
109	device_init_wakeup(&pdev->dev, 1);
110	return 0;
111}
112
113#ifdef CONFIG_OF
114static const struct of_device_id e3x0_button_match[] = {
115	{ .compatible = "ettus,e3x0-button", },
116	{ }
117};
118MODULE_DEVICE_TABLE(of, e3x0_button_match);
119#endif
120
121static struct platform_driver e3x0_button_driver = {
122	.driver		= {
123		.name	= "e3x0-button",
124		.of_match_table = of_match_ptr(e3x0_button_match),
125		.pm	= pm_sleep_ptr(&e3x0_button_pm_ops),
126	},
127	.probe		= e3x0_button_probe,
128};
129
130module_platform_driver(e3x0_button_driver);
131
132MODULE_LICENSE("GPL v2");
133MODULE_AUTHOR("Moritz Fischer <moritz.fischer@ettus.com>");
134MODULE_DESCRIPTION("NI Ettus Research USRP E3x0 Button driver");
135MODULE_ALIAS("platform:e3x0-button");
136