aboutsummaryrefslogtreecommitdiffstats
path: root/drivers/input/misc/max8925_onkey.c
blob: 80af4460801862b52039663c1f58fbb2b8434bbd (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
/**
 * max8925_onkey.c - MAX8925 ONKEY driver
 *
 * Copyright (C) 2009 Marvell International Ltd.
 *      Haojian Zhuang <haojian.zhuang@marvell.com>
 *
 * This file is subject to the terms and conditions of the GNU General
 * Public License. See the file "COPYING" in the main directory of this
 * archive for more details.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 */

#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/platform_device.h>
#include <linux/i2c.h>
#include <linux/input.h>
#include <linux/interrupt.h>
#include <linux/mfd/max8925.h>
#include <linux/slab.h>

#define HARDRESET_EN		(1 << 7)
#define PWREN_EN		(1 << 7)

struct max8925_onkey_info {
	struct input_dev	*idev;
	struct i2c_client	*i2c;
	int			irq;
};

/*
 * MAX8925 gives us an interrupt when ONKEY is held for 3 seconds.
 * max8925_set_bits() operates I2C bus and may sleep. So implement
 * it in thread IRQ handler.
 */
static irqreturn_t max8925_onkey_handler(int irq, void *data)
{
	struct max8925_onkey_info *info = data;

	input_report_key(info->idev, KEY_POWER, 1);
	input_sync(info->idev);

	/* Enable hardreset to halt if system isn't shutdown on time */
	max8925_set_bits(info->i2c, MAX8925_SYSENSEL,
			 HARDRESET_EN, HARDRESET_EN);

	return IRQ_HANDLED;
}

static int __devinit max8925_onkey_probe(struct platform_device *pdev)
{
	struct max8925_chip *chip = dev_get_drvdata(pdev->dev.parent);
	struct max8925_onkey_info *info;
	int error;

	info = kzalloc(sizeof(struct max8925_onkey_info), GFP_KERNEL);
	if (!info)
		return -ENOMEM;

	info->i2c = chip->i2c;
	info->irq = chip->irq_base + MAX8925_IRQ_GPM_SW_3SEC;

	info->idev = input_allocate_device();
	if (!info->idev) {
		dev_err(chip->dev, "Failed to allocate input dev\n");
		error = -ENOMEM;
		goto out_input;
	}

	info->idev->name = "max8925_on";
	info->idev->phys = "max8925_on/input0";
	info->idev->id.bustype = BUS_I2C;
	info->idev->dev.parent = &pdev->dev;
	info->idev->evbit[0] = BIT_MASK(EV_KEY);
	info->idev->keybit[BIT_WORD(KEY_POWER)] = BIT_MASK(KEY_POWER);

	error = request_threaded_irq(info->irq, NULL, max8925_onkey_handler,
				     IRQF_ONESHOT, "onkey", info);
	if (error < 0) {
		dev_err(chip->dev, "Failed to request IRQ: #%d: %d\n",
			info->irq, error);
		goto out_irq;
	}

	error = input_register_device(info->idev);
	if (error) {
		dev_err(chip->dev, "Can't register input device: %d\n", error);
		goto out;
	}

	platform_set_drvdata(pdev, info);

	return 0;

out:
	free_irq(info->irq, info);
out_irq:
	input_free_device(info->idev);
out_input:
	kfree(info);
	return error;
}

static int __devexit max8925_onkey_remove(struct platform_device *pdev)
{
	struct max8925_onkey_info *info = platform_get_drvdata(pdev);

	free_irq(info->irq, info);
	input_unregister_device(info->idev);
	kfree(info);

	platform_set_drvdata(pdev, NULL);

	return 0;
}

static struct platform_driver max8925_onkey_driver = {
	.driver		= {
		.name	= "max8925-onkey",
		.owner	= THIS_MODULE,
	},
	.probe		= max8925_onkey_probe,
	.remove		= __devexit_p(max8925_onkey_remove),
};

static int __init max8925_onkey_init(void)
{
	return platform_driver_register(&max8925_onkey_driver);
}
module_init(max8925_onkey_init);

static void __exit max8925_onkey_exit(void)
{
	platform_driver_unregister(&max8925_onkey_driver);
}
module_exit(max8925_onkey_exit);

MODULE_DESCRIPTION("Maxim MAX8925 ONKEY driver");
MODULE_AUTHOR("Haojian Zhuang <haojian.zhuang@marvell.com>");
MODULE_LICENSE("GPL");