summaryrefslogtreecommitdiffstats
path: root/drivers/input/misc/pcf50633-input.c
blob: 039dcb00ebd96250efea2a7b5903cb4521dee60f (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
/* NXP PCF50633 Input Driver
 *
 * (C) 2006-2008 by Openmoko, Inc.
 * Author: Balaji Rao <balajirrao@openmoko.org>
 * All rights reserved.
 *
 * Broken down from monstrous PCF50633 driver mainly by
 * Harald Welte, Andy Green and Werner Almesberger
 *
 *  This program is free software; you can redistribute  it and/or modify it
 *  under  the terms of  the GNU General  Public License as published by the
 *  Free Software Foundation;  either version 2 of the  License, or (at your
 *  option) any later version.
 *
 */

#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/init.h>
#include <linux/device.h>
#include <linux/platform_device.h>
#include <linux/input.h>

#include <linux/mfd/pcf50633/core.h>

#define PCF50633_OOCSTAT_ONKEY	0x01
#define PCF50633_REG_OOCSTAT	0x12
#define PCF50633_REG_OOCMODE	0x10

struct pcf50633_input {
	struct pcf50633 *pcf;
	struct input_dev *input_dev;
};

static void
pcf50633_input_irq(int irq, void *data)
{
	struct pcf50633_input *input;
	int onkey_released;

	input = data;

	/* We report only one event depending on the key press status */
	onkey_released = pcf50633_reg_read(input->pcf, PCF50633_REG_OOCSTAT)
						& PCF50633_OOCSTAT_ONKEY;

	if (irq == PCF50633_IRQ_ONKEYF && !onkey_released)
		input_report_key(input->input_dev, KEY_POWER, 1);
	else if (irq == PCF50633_IRQ_ONKEYR && onkey_released)
		input_report_key(input->input_dev, KEY_POWER, 0);

	input_sync(input->input_dev);
}

static int __devinit pcf50633_input_probe(struct platform_device *pdev)
{
	struct pcf50633_input *input;
	struct pcf50633_subdev_pdata *pdata = pdev->dev.platform_data;
	struct input_dev *input_dev;
	int ret;


	input = kzalloc(sizeof(*input), GFP_KERNEL);
	if (!input)
		return -ENOMEM;

	input_dev = input_allocate_device();
	if (!input_dev) {
		kfree(input);
		return -ENOMEM;
	}

	platform_set_drvdata(pdev, input);
	input->pcf = pdata->pcf;
	input->input_dev = input_dev;

	input_dev->name = "PCF50633 PMU events";
	input_dev->id.bustype = BUS_I2C;
	input_dev->evbit[0] = BIT(EV_KEY) | BIT(EV_PWR);
	set_bit(KEY_POWER, input_dev->keybit);

	ret = input_register_device(input_dev);
	if (ret) {
		input_free_device(input_dev);
		kfree(input);
		return ret;
	}
	pcf50633_register_irq(pdata->pcf, PCF50633_IRQ_ONKEYR,
				pcf50633_input_irq, input);
	pcf50633_register_irq(pdata->pcf, PCF50633_IRQ_ONKEYF,
				pcf50633_input_irq, input);

	return 0;
}

static int __devexit pcf50633_input_remove(struct platform_device *pdev)
{
	struct pcf50633_input *input  = platform_get_drvdata(pdev);

	pcf50633_free_irq(input->pcf, PCF50633_IRQ_ONKEYR);
	pcf50633_free_irq(input->pcf, PCF50633_IRQ_ONKEYF);

	input_unregister_device(input->input_dev);
	kfree(input);

	return 0;
}

static struct platform_driver pcf50633_input_driver = {
	.driver = {
		.name = "pcf50633-input",
	},
	.probe = pcf50633_input_probe,
	.remove = __devexit_p(pcf50633_input_remove),
};

static int __init pcf50633_input_init(void)
{
	return platform_driver_register(&pcf50633_input_driver);
}
module_init(pcf50633_input_init);

static void __exit pcf50633_input_exit(void)
{
	platform_driver_unregister(&pcf50633_input_driver);
}
module_exit(pcf50633_input_exit);

MODULE_AUTHOR("Balaji Rao <balajirrao@openmoko.org>");
MODULE_DESCRIPTION("PCF50633 input driver");
MODULE_LICENSE("GPL");
MODULE_ALIAS("platform:pcf50633-input");