1*4882a593Smuzhiyun /*
2*4882a593Smuzhiyun * Retu power button driver.
3*4882a593Smuzhiyun *
4*4882a593Smuzhiyun * Copyright (C) 2004-2010 Nokia Corporation
5*4882a593Smuzhiyun *
6*4882a593Smuzhiyun * Original code written by Ari Saastamoinen, Juha Yrjölä and Felipe Balbi.
7*4882a593Smuzhiyun * Rewritten by Aaro Koskinen.
8*4882a593Smuzhiyun *
9*4882a593Smuzhiyun * This file is subject to the terms and conditions of the GNU General
10*4882a593Smuzhiyun * Public License. See the file "COPYING" in the main directory of this
11*4882a593Smuzhiyun * archive for more details.
12*4882a593Smuzhiyun *
13*4882a593Smuzhiyun * This program is distributed in the hope that it will be useful,
14*4882a593Smuzhiyun * but WITHOUT ANY WARRANTY; without even the implied warranty of
15*4882a593Smuzhiyun * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16*4882a593Smuzhiyun * GNU General Public License for more details.
17*4882a593Smuzhiyun */
18*4882a593Smuzhiyun
19*4882a593Smuzhiyun #include <linux/irq.h>
20*4882a593Smuzhiyun #include <linux/slab.h>
21*4882a593Smuzhiyun #include <linux/errno.h>
22*4882a593Smuzhiyun #include <linux/input.h>
23*4882a593Smuzhiyun #include <linux/kernel.h>
24*4882a593Smuzhiyun #include <linux/module.h>
25*4882a593Smuzhiyun #include <linux/mfd/retu.h>
26*4882a593Smuzhiyun #include <linux/interrupt.h>
27*4882a593Smuzhiyun #include <linux/platform_device.h>
28*4882a593Smuzhiyun
29*4882a593Smuzhiyun #define RETU_STATUS_PWRONX (1 << 5)
30*4882a593Smuzhiyun
retu_pwrbutton_irq(int irq,void * _pwr)31*4882a593Smuzhiyun static irqreturn_t retu_pwrbutton_irq(int irq, void *_pwr)
32*4882a593Smuzhiyun {
33*4882a593Smuzhiyun struct input_dev *idev = _pwr;
34*4882a593Smuzhiyun struct retu_dev *rdev = input_get_drvdata(idev);
35*4882a593Smuzhiyun bool state;
36*4882a593Smuzhiyun
37*4882a593Smuzhiyun state = !(retu_read(rdev, RETU_REG_STATUS) & RETU_STATUS_PWRONX);
38*4882a593Smuzhiyun input_report_key(idev, KEY_POWER, state);
39*4882a593Smuzhiyun input_sync(idev);
40*4882a593Smuzhiyun
41*4882a593Smuzhiyun return IRQ_HANDLED;
42*4882a593Smuzhiyun }
43*4882a593Smuzhiyun
retu_pwrbutton_probe(struct platform_device * pdev)44*4882a593Smuzhiyun static int retu_pwrbutton_probe(struct platform_device *pdev)
45*4882a593Smuzhiyun {
46*4882a593Smuzhiyun struct retu_dev *rdev = dev_get_drvdata(pdev->dev.parent);
47*4882a593Smuzhiyun struct input_dev *idev;
48*4882a593Smuzhiyun int irq;
49*4882a593Smuzhiyun int error;
50*4882a593Smuzhiyun
51*4882a593Smuzhiyun irq = platform_get_irq(pdev, 0);
52*4882a593Smuzhiyun if (irq < 0)
53*4882a593Smuzhiyun return irq;
54*4882a593Smuzhiyun
55*4882a593Smuzhiyun idev = devm_input_allocate_device(&pdev->dev);
56*4882a593Smuzhiyun if (!idev)
57*4882a593Smuzhiyun return -ENOMEM;
58*4882a593Smuzhiyun
59*4882a593Smuzhiyun idev->name = "retu-pwrbutton";
60*4882a593Smuzhiyun idev->dev.parent = &pdev->dev;
61*4882a593Smuzhiyun
62*4882a593Smuzhiyun input_set_capability(idev, EV_KEY, KEY_POWER);
63*4882a593Smuzhiyun input_set_drvdata(idev, rdev);
64*4882a593Smuzhiyun
65*4882a593Smuzhiyun error = devm_request_threaded_irq(&pdev->dev, irq,
66*4882a593Smuzhiyun NULL, retu_pwrbutton_irq,
67*4882a593Smuzhiyun IRQF_ONESHOT,
68*4882a593Smuzhiyun "retu-pwrbutton", idev);
69*4882a593Smuzhiyun if (error)
70*4882a593Smuzhiyun return error;
71*4882a593Smuzhiyun
72*4882a593Smuzhiyun error = input_register_device(idev);
73*4882a593Smuzhiyun if (error)
74*4882a593Smuzhiyun return error;
75*4882a593Smuzhiyun
76*4882a593Smuzhiyun return 0;
77*4882a593Smuzhiyun }
78*4882a593Smuzhiyun
79*4882a593Smuzhiyun static struct platform_driver retu_pwrbutton_driver = {
80*4882a593Smuzhiyun .probe = retu_pwrbutton_probe,
81*4882a593Smuzhiyun .driver = {
82*4882a593Smuzhiyun .name = "retu-pwrbutton",
83*4882a593Smuzhiyun },
84*4882a593Smuzhiyun };
85*4882a593Smuzhiyun module_platform_driver(retu_pwrbutton_driver);
86*4882a593Smuzhiyun
87*4882a593Smuzhiyun MODULE_ALIAS("platform:retu-pwrbutton");
88*4882a593Smuzhiyun MODULE_DESCRIPTION("Retu Power Button");
89*4882a593Smuzhiyun MODULE_AUTHOR("Ari Saastamoinen");
90*4882a593Smuzhiyun MODULE_AUTHOR("Felipe Balbi");
91*4882a593Smuzhiyun MODULE_AUTHOR("Aaro Koskinen <aaro.koskinen@iki.fi>");
92*4882a593Smuzhiyun MODULE_LICENSE("GPL");
93