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
retu_pwrbutton_irq(int irq,void * _pwr)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
retu_pwrbutton_probe(struct platform_device * pdev)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 struct platform_driver retu_pwrbutton_driver = {
80 .probe = retu_pwrbutton_probe,
81 .driver = {
82 .name = "retu-pwrbutton",
83 },
84 };
85 module_platform_driver(retu_pwrbutton_driver);
86
87 MODULE_ALIAS("platform:retu-pwrbutton");
88 MODULE_DESCRIPTION("Retu Power Button");
89 MODULE_AUTHOR("Ari Saastamoinen");
90 MODULE_AUTHOR("Felipe Balbi");
91 MODULE_AUTHOR("Aaro Koskinen <aaro.koskinen@iki.fi>");
92 MODULE_LICENSE("GPL");
93