1 /*
2  * Retu power button driver.
3  *
4  * Copyright (C) 2004-2010 Nokia Corporation
5  *
6  * Original code written by Ari Saastamoinen, Juha Yrjölä and Felipe Balbi.
7  * Rewritten by Aaro Koskinen.
8  *
9  * This file is subject to the terms and conditions of the GNU General
10  * Public License. See the file "COPYING" in the main directory of this
11  * archive for more details.
12  *
13  * This program is distributed in the hope that it will be useful,
14  * but WITHOUT ANY WARRANTY; without even the implied warranty of
15  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16  * GNU General Public License for more details.
17  */
18 
19 #include <linux/irq.h>
20 #include <linux/slab.h>
21 #include <linux/errno.h>
22 #include <linux/input.h>
23 #include <linux/kernel.h>
24 #include <linux/module.h>
25 #include <linux/mfd/retu.h>
26 #include <linux/interrupt.h>
27 #include <linux/platform_device.h>
28 
29 #define RETU_STATUS_PWRONX (1 << 5)
30 
31 static irqreturn_t retu_pwrbutton_irq(int irq, void *_pwr)
32 {
33 	struct input_dev *idev = _pwr;
34 	struct retu_dev *rdev = input_get_drvdata(idev);
35 	bool state;
36 
37 	state = !(retu_read(rdev, RETU_REG_STATUS) & RETU_STATUS_PWRONX);
38 	input_report_key(idev, KEY_POWER, state);
39 	input_sync(idev);
40 
41 	return IRQ_HANDLED;
42 }
43 
44 static int retu_pwrbutton_probe(struct platform_device *pdev)
45 {
46 	struct retu_dev *rdev = dev_get_drvdata(pdev->dev.parent);
47 	struct input_dev *idev;
48 	int irq;
49 	int error;
50 
51 	irq = platform_get_irq(pdev, 0);
52 	if (irq < 0)
53 		return irq;
54 
55 	idev = devm_input_allocate_device(&pdev->dev);
56 	if (!idev)
57 		return -ENOMEM;
58 
59 	idev->name = "retu-pwrbutton";
60 	idev->dev.parent = &pdev->dev;
61 
62 	input_set_capability(idev, EV_KEY, KEY_POWER);
63 	input_set_drvdata(idev, rdev);
64 
65 	error = devm_request_threaded_irq(&pdev->dev, irq,
66 					  NULL, retu_pwrbutton_irq,
67 					  IRQF_ONESHOT,
68 					  "retu-pwrbutton", idev);
69 	if (error)
70 		return error;
71 
72 	error = input_register_device(idev);
73 	if (error)
74 		return error;
75 
76 	return 0;
77 }
78 
79 static int retu_pwrbutton_remove(struct platform_device *pdev)
80 {
81 	return 0;
82 }
83 
84 static struct platform_driver retu_pwrbutton_driver = {
85 	.probe		= retu_pwrbutton_probe,
86 	.remove		= retu_pwrbutton_remove,
87 	.driver		= {
88 		.name	= "retu-pwrbutton",
89 	},
90 };
91 module_platform_driver(retu_pwrbutton_driver);
92 
93 MODULE_ALIAS("platform:retu-pwrbutton");
94 MODULE_DESCRIPTION("Retu Power Button");
95 MODULE_AUTHOR("Ari Saastamoinen");
96 MODULE_AUTHOR("Felipe Balbi");
97 MODULE_AUTHOR("Aaro Koskinen <aaro.koskinen@iki.fi>");
98 MODULE_LICENSE("GPL");
99