[go: nahoru, domu]
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
31static 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
44static 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, 0,
67					  "retu-pwrbutton", idev);
68	if (error)
69		return error;
70
71	error = input_register_device(idev);
72	if (error)
73		return error;
74
75	return 0;
76}
77
78static int retu_pwrbutton_remove(struct platform_device *pdev)
79{
80	return 0;
81}
82
83static struct platform_driver retu_pwrbutton_driver = {
84	.probe		= retu_pwrbutton_probe,
85	.remove		= retu_pwrbutton_remove,
86	.driver		= {
87		.name	= "retu-pwrbutton",
88		.owner	= THIS_MODULE,
89	},
90};
91module_platform_driver(retu_pwrbutton_driver);
92
93MODULE_ALIAS("platform:retu-pwrbutton");
94MODULE_DESCRIPTION("Retu Power Button");
95MODULE_AUTHOR("Ari Saastamoinen");
96MODULE_AUTHOR("Felipe Balbi");
97MODULE_AUTHOR("Aaro Koskinen <aaro.koskinen@iki.fi>");
98MODULE_LICENSE("GPL");
99