summaryrefslogtreecommitdiffstats
path: root/drivers/input/misc/ab8500-ponkey.c
blob: 79d9016336355a4885681ca68a2a0249b3b5894e (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
/*
 * Copyright (C) ST-Ericsson SA 2010
 *
 * License Terms: GNU General Public License v2
 * Author: Sundar Iyer <sundar.iyer@stericsson.com> for ST-Ericsson
 *
 * AB8500 Power-On Key handler
 */

#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/platform_device.h>
#include <linux/input.h>
#include <linux/interrupt.h>
#include <linux/mfd/ab8500.h>
#include <linux/slab.h>

/**
 * struct ab8500_ponkey - ab8500 ponkey information
 * @input_dev: pointer to input device
 * @ab8500: ab8500 parent
 * @irq_dbf: irq number for falling transition
 * @irq_dbr: irq number for rising transition
 */
struct ab8500_ponkey {
	struct input_dev	*idev;
	struct ab8500		*ab8500;
	int			irq_dbf;
	int			irq_dbr;
};

/* AB8500 gives us an interrupt when ONKEY is held */
static irqreturn_t ab8500_ponkey_handler(int irq, void *data)
{
	struct ab8500_ponkey *ponkey = data;

	if (irq == ponkey->irq_dbf)
		input_report_key(ponkey->idev, KEY_POWER, true);
	else if (irq == ponkey->irq_dbr)
		input_report_key(ponkey->idev, KEY_POWER, false);

	input_sync(ponkey->idev);

	return IRQ_HANDLED;
}

static int __devinit ab8500_ponkey_probe(struct platform_device *pdev)
{
	struct ab8500 *ab8500 = dev_get_drvdata(pdev->dev.parent);
	struct ab8500_ponkey *ponkey;
	struct input_dev *input;
	int irq_dbf, irq_dbr;
	int error;

	irq_dbf = platform_get_irq_byname(pdev, "ONKEY_DBF");
	if (irq_dbf < 0) {
		dev_err(&pdev->dev, "No IRQ for ONKEY_DBF, error=%d\n", irq_dbf);
		return irq_dbf;
	}

	irq_dbr = platform_get_irq_byname(pdev, "ONKEY_DBR");
	if (irq_dbr < 0) {
		dev_err(&pdev->dev, "No IRQ for ONKEY_DBR, error=%d\n", irq_dbr);
		return irq_dbr;
	}

	ponkey = kzalloc(sizeof(struct ab8500_ponkey), GFP_KERNEL);
	input = input_allocate_device();
	if (!ponkey || !input) {
		error = -ENOMEM;
		goto err_free_mem;
	}

	ponkey->idev = input;
	ponkey->ab8500 = ab8500;
	ponkey->irq_dbf = irq_dbf;
	ponkey->irq_dbr = irq_dbr;

	input->name = "AB8500 POn(PowerOn) Key";
	input->dev.parent = &pdev->dev;

	input_set_capability(input, EV_KEY, KEY_POWER);

	error = request_any_context_irq(ponkey->irq_dbf, ab8500_ponkey_handler,
					0, "ab8500-ponkey-dbf", ponkey);
	if (error < 0) {
		dev_err(ab8500->dev, "Failed to request dbf IRQ#%d: %d\n",
			ponkey->irq_dbf, error);
		goto err_free_mem;
	}

	error = request_any_context_irq(ponkey->irq_dbr, ab8500_ponkey_handler,
					0, "ab8500-ponkey-dbr", ponkey);
	if (error < 0) {
		dev_err(ab8500->dev, "Failed to request dbr IRQ#%d: %d\n",
			ponkey->irq_dbr, error);
		goto err_free_dbf_irq;
	}

	error = input_register_device(ponkey->idev);
	if (error) {
		dev_err(ab8500->dev, "Can't register input device: %d\n", error);
		goto err_free_dbr_irq;
	}

	platform_set_drvdata(pdev, ponkey);
	return 0;

err_free_dbr_irq:
	free_irq(ponkey->irq_dbr, ponkey);
err_free_dbf_irq:
	free_irq(ponkey->irq_dbf, ponkey);
err_free_mem:
	input_free_device(input);
	kfree(ponkey);

	return error;
}

static int __devexit ab8500_ponkey_remove(struct platform_device *pdev)
{
	struct ab8500_ponkey *ponkey = platform_get_drvdata(pdev);

	free_irq(ponkey->irq_dbf, ponkey);
	free_irq(ponkey->irq_dbr, ponkey);
	input_unregister_device(ponkey->idev);
	kfree(ponkey);

	platform_set_drvdata(pdev, NULL);

	return 0;
}

static struct platform_driver ab8500_ponkey_driver = {
	.driver		= {
		.name	= "ab8500-poweron-key",
		.owner	= THIS_MODULE,
	},
	.probe		= ab8500_ponkey_probe,
	.remove		= __devexit_p(ab8500_ponkey_remove),
};
module_platform_driver(ab8500_ponkey_driver);

MODULE_LICENSE("GPL v2");
MODULE_AUTHOR("Sundar Iyer <sundar.iyer@stericsson.com>");
MODULE_DESCRIPTION("ST-Ericsson AB8500 Power-ON(Pon) Key driver");
OpenPOWER on IntegriCloud