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/of.h>
30#include <linux/platform_device.h>
31#include <linux/mfd/twl.h>
32
33#define PWR_PWRON_IRQ (1 << 0)
34
35#define STS_HW_CONDITIONS 0xf
36
37static irqreturn_t powerbutton_irq(int irq, void *_pwr)
38{
39	struct input_dev *pwr = _pwr;
40	int err;
41	u8 value;
42
43	err = twl_i2c_read_u8(TWL_MODULE_PM_MASTER, &value, STS_HW_CONDITIONS);
44	if (!err)  {
45		pm_wakeup_event(pwr->dev.parent, 0);
46		input_report_key(pwr, KEY_POWER, value & PWR_PWRON_IRQ);
47		input_sync(pwr);
48	} else {
49		dev_err(pwr->dev.parent, "twl4030: i2c error %d while reading"
50			" TWL4030 PM_MASTER STS_HW_CONDITIONS register\n", err);
51	}
52
53	return IRQ_HANDLED;
54}
55
56static int twl4030_pwrbutton_probe(struct platform_device *pdev)
57{
58	struct input_dev *pwr;
59	int irq = platform_get_irq(pdev, 0);
60	int err;
61
62	pwr = devm_input_allocate_device(&pdev->dev);
63	if (!pwr) {
64		dev_err(&pdev->dev, "Can't allocate power button\n");
65		return -ENOMEM;
66	}
67
68	input_set_capability(pwr, EV_KEY, KEY_POWER);
69	pwr->name = "twl4030_pwrbutton";
70	pwr->phys = "twl4030_pwrbutton/input0";
71	pwr->dev.parent = &pdev->dev;
72
73	err = devm_request_threaded_irq(&pdev->dev, irq, NULL, powerbutton_irq,
74			IRQF_TRIGGER_FALLING | IRQF_TRIGGER_RISING |
75			IRQF_ONESHOT,
76			"twl4030_pwrbutton", pwr);
77	if (err < 0) {
78		dev_err(&pdev->dev, "Can't get IRQ for pwrbutton: %d\n", err);
79		return err;
80	}
81
82	err = input_register_device(pwr);
83	if (err) {
84		dev_err(&pdev->dev, "Can't register power button: %d\n", err);
85		return err;
86	}
87
88	device_init_wakeup(&pdev->dev, true);
89
90	return 0;
91}
92
93#ifdef CONFIG_OF
94static const struct of_device_id twl4030_pwrbutton_dt_match_table[] = {
95       { .compatible = "ti,twl4030-pwrbutton" },
96       {},
97};
98MODULE_DEVICE_TABLE(of, twl4030_pwrbutton_dt_match_table);
99#endif
100
101static struct platform_driver twl4030_pwrbutton_driver = {
102	.probe		= twl4030_pwrbutton_probe,
103	.driver		= {
104		.name	= "twl4030_pwrbutton",
105		.of_match_table = of_match_ptr(twl4030_pwrbutton_dt_match_table),
106	},
107};
108module_platform_driver(twl4030_pwrbutton_driver);
109
110MODULE_ALIAS("platform:twl4030_pwrbutton");
111MODULE_DESCRIPTION("Triton2 Power Button");
112MODULE_LICENSE("GPL");
113MODULE_AUTHOR("Peter De Schrijver <peter.de-schrijver@nokia.com>");
114MODULE_AUTHOR("Felipe Balbi <felipe.balbi@nokia.com>");
115
116