1/**
2 * twl4030-pwrbutton.c - TWL4030 Power Button Input Driver
3 *
4 * Copyright (C) 2008-2009 Nokia Corporation
5 *
6 * Written by Peter De Schrijver <peter.de-schrijver@nokia.com>
7 * Several fixes by Felipe Balbi <felipe.balbi@nokia.com>
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 * You should have received a copy of the GNU General Public License
19 * along with this program; if not, write to the Free Software
20 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
21 */
22
23#include <linux/module.h>
24#include <linux/init.h>
25#include <linux/kernel.h>
26#include <linux/errno.h>
27#include <linux/input.h>
28#include <linux/interrupt.h>
29#include <linux/platform_device.h>
30#include <linux/mfd/twl.h>
31
32#define PWR_PWRON_IRQ (1 << 0)
33
34#define STS_HW_CONDITIONS 0xf
35
36static irqreturn_t powerbutton_irq(int irq, void *_pwr)
37{
38	struct input_dev *pwr = _pwr;
39	int err;
40	u8 value;
41
42	err = twl_i2c_read_u8(TWL_MODULE_PM_MASTER, &value, STS_HW_CONDITIONS);
43	if (!err)  {
44		pm_wakeup_event(pwr->dev.parent, 0);
45		input_report_key(pwr, KEY_POWER, value & PWR_PWRON_IRQ);
46		input_sync(pwr);
47	} else {
48		dev_err(pwr->dev.parent, "twl4030: i2c error %d while reading"
49			" TWL4030 PM_MASTER STS_HW_CONDITIONS register\n", err);
50	}
51
52	return IRQ_HANDLED;
53}
54
55static int twl4030_pwrbutton_probe(struct platform_device *pdev)
56{
57	struct input_dev *pwr;
58	int irq = platform_get_irq(pdev, 0);
59	int err;
60
61	pwr = devm_input_allocate_device(&pdev->dev);
62	if (!pwr) {
63		dev_err(&pdev->dev, "Can't allocate power button\n");
64		return -ENOMEM;
65	}
66
67	input_set_capability(pwr, EV_KEY, KEY_POWER);
68	pwr->name = "twl4030_pwrbutton";
69	pwr->phys = "twl4030_pwrbutton/input0";
70	pwr->dev.parent = &pdev->dev;
71
72	err = devm_request_threaded_irq(&pdev->dev, irq, NULL, powerbutton_irq,
73			IRQF_TRIGGER_FALLING | IRQF_TRIGGER_RISING |
74			IRQF_ONESHOT,
75			"twl4030_pwrbutton", pwr);
76	if (err < 0) {
77		dev_err(&pdev->dev, "Can't get IRQ for pwrbutton: %d\n", err);
78		return err;
79	}
80
81	err = input_register_device(pwr);
82	if (err) {
83		dev_err(&pdev->dev, "Can't register power button: %d\n", err);
84		return err;
85	}
86
87	device_init_wakeup(&pdev->dev, true);
88
89	return 0;
90}
91
92#ifdef CONFIG_OF
93static const struct of_device_id twl4030_pwrbutton_dt_match_table[] = {
94       { .compatible = "ti,twl4030-pwrbutton" },
95       {},
96};
97MODULE_DEVICE_TABLE(of, twl4030_pwrbutton_dt_match_table);
98#endif
99
100static struct platform_driver twl4030_pwrbutton_driver = {
101	.probe		= twl4030_pwrbutton_probe,
102	.driver		= {
103		.name	= "twl4030_pwrbutton",
104		.of_match_table = of_match_ptr(twl4030_pwrbutton_dt_match_table),
105	},
106};
107module_platform_driver(twl4030_pwrbutton_driver);
108
109MODULE_ALIAS("platform:twl4030_pwrbutton");
110MODULE_DESCRIPTION("Triton2 Power Button");
111MODULE_LICENSE("GPL");
112MODULE_AUTHOR("Peter De Schrijver <peter.de-schrijver@nokia.com>");
113MODULE_AUTHOR("Felipe Balbi <felipe.balbi@nokia.com>");
114
115