GNU Linux-libre 4.14.266-gnu1
[releases.git] / drivers / input / misc / e3x0-button.c
1 /*
2  * Copyright (c) 2014, National Instruments Corp. All rights reserved.
3  *
4  * Driver for NI Ettus Research USRP E3x0 Button Driver
5  *
6  * This program is free software; you can redistribute it and/or modify
7  * it under the terms of the GNU General Public License as published by
8  * the Free Software Foundation; version 2 of the License.
9  *
10  * This program is distributed in the hope that it will be useful,
11  * but WITHOUT ANY WARRANTY; without even the implied warranty of
12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
13  * GNU General Public License for more details.
14  */
15
16 #include <linux/device.h>
17 #include <linux/kernel.h>
18 #include <linux/module.h>
19 #include <linux/platform_device.h>
20 #include <linux/input.h>
21 #include <linux/interrupt.h>
22 #include <linux/of.h>
23 #include <linux/slab.h>
24
25 static irqreturn_t e3x0_button_release_handler(int irq, void *data)
26 {
27         struct input_dev *idev = data;
28
29         input_report_key(idev, KEY_POWER, 0);
30         input_sync(idev);
31
32         return IRQ_HANDLED;
33 }
34
35 static irqreturn_t e3x0_button_press_handler(int irq, void *data)
36 {
37         struct input_dev *idev = data;
38
39         input_report_key(idev, KEY_POWER, 1);
40         pm_wakeup_event(idev->dev.parent, 0);
41         input_sync(idev);
42
43         return IRQ_HANDLED;
44 }
45
46 static int __maybe_unused e3x0_button_suspend(struct device *dev)
47 {
48         struct platform_device *pdev = to_platform_device(dev);
49
50         if (device_may_wakeup(dev))
51                 enable_irq_wake(platform_get_irq_byname(pdev, "press"));
52
53         return 0;
54 }
55
56 static int __maybe_unused e3x0_button_resume(struct device *dev)
57 {
58         struct platform_device *pdev = to_platform_device(dev);
59
60         if (device_may_wakeup(dev))
61                 disable_irq_wake(platform_get_irq_byname(pdev, "press"));
62
63         return 0;
64 }
65
66 static SIMPLE_DEV_PM_OPS(e3x0_button_pm_ops,
67                          e3x0_button_suspend, e3x0_button_resume);
68
69 static int e3x0_button_probe(struct platform_device *pdev)
70 {
71         struct input_dev *input;
72         int irq_press, irq_release;
73         int error;
74
75         irq_press = platform_get_irq_byname(pdev, "press");
76         if (irq_press < 0) {
77                 dev_err(&pdev->dev, "No IRQ for 'press', error=%d\n",
78                         irq_press);
79                 return irq_press;
80         }
81
82         irq_release = platform_get_irq_byname(pdev, "release");
83         if (irq_release < 0) {
84                 dev_err(&pdev->dev, "No IRQ for 'release', error=%d\n",
85                         irq_release);
86                 return irq_release;
87         }
88
89         input = devm_input_allocate_device(&pdev->dev);
90         if (!input)
91                 return -ENOMEM;
92
93         input->name = "NI Ettus Research USRP E3x0 Button Driver";
94         input->phys = "e3x0_button/input0";
95         input->dev.parent = &pdev->dev;
96
97         input_set_capability(input, EV_KEY, KEY_POWER);
98
99         error = devm_request_irq(&pdev->dev, irq_press,
100                                  e3x0_button_press_handler, 0,
101                                  "e3x0-button", input);
102         if (error) {
103                 dev_err(&pdev->dev, "Failed to request 'press' IRQ#%d: %d\n",
104                         irq_press, error);
105                 return error;
106         }
107
108         error = devm_request_irq(&pdev->dev, irq_release,
109                                  e3x0_button_release_handler, 0,
110                                  "e3x0-button", input);
111         if (error) {
112                 dev_err(&pdev->dev, "Failed to request 'release' IRQ#%d: %d\n",
113                         irq_release, error);
114                 return error;
115         }
116
117         error = input_register_device(input);
118         if (error) {
119                 dev_err(&pdev->dev, "Can't register input device: %d\n", error);
120                 return error;
121         }
122
123         device_init_wakeup(&pdev->dev, 1);
124         return 0;
125 }
126
127 #ifdef CONFIG_OF
128 static const struct of_device_id e3x0_button_match[] = {
129         { .compatible = "ettus,e3x0-button", },
130         { }
131 };
132 MODULE_DEVICE_TABLE(of, e3x0_button_match);
133 #endif
134
135 static struct platform_driver e3x0_button_driver = {
136         .driver         = {
137                 .name   = "e3x0-button",
138                 .of_match_table = of_match_ptr(e3x0_button_match),
139                 .pm     = &e3x0_button_pm_ops,
140         },
141         .probe          = e3x0_button_probe,
142 };
143
144 module_platform_driver(e3x0_button_driver);
145
146 MODULE_LICENSE("GPL v2");
147 MODULE_AUTHOR("Moritz Fischer <moritz.fischer@ettus.com>");
148 MODULE_DESCRIPTION("NI Ettus Research USRP E3x0 Button driver");
149 MODULE_ALIAS("platform:e3x0-button");