summaryrefslogtreecommitdiffstats
path: root/drivers/input/misc/da9052_onkey.c
blob: 3c843cd725fac0ec0a7f4c63310f47ad942da0a0 (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
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
/*
 * ON pin driver for Dialog DA9052 PMICs
 *
 * Copyright(c) 2012 Dialog Semiconductor Ltd.
 *
 * Author: David Dajun Chen <dchen@diasemi.com>
 *
 * 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/init.h>
#include <linux/input.h>
#include <linux/module.h>
#include <linux/platform_device.h>
#include <linux/workqueue.h>

#include <linux/mfd/da9052/da9052.h>
#include <linux/mfd/da9052/reg.h>

struct da9052_onkey {
	struct da9052 *da9052;
	struct input_dev *input;
	struct delayed_work work;
	unsigned int irq;
};

static void da9052_onkey_query(struct da9052_onkey *onkey)
{
	int key_stat;

	key_stat = da9052_reg_read(onkey->da9052, DA9052_EVENT_B_REG);
	if (key_stat < 0) {
		dev_err(onkey->da9052->dev,
			"Failed to read onkey event %d\n", key_stat);
	} else {
		/*
		 * Since interrupt for deassertion of ONKEY pin is not
		 * generated, onkey event state determines the onkey
		 * button state.
		 */
		key_stat &= DA9052_EVENTB_ENONKEY;
		input_report_key(onkey->input, KEY_POWER, key_stat);
		input_sync(onkey->input);
	}

	/*
	 * Interrupt is generated only when the ONKEY pin is asserted.
	 * Hence the deassertion of the pin is simulated through work queue.
	 */
	if (key_stat)
		schedule_delayed_work(&onkey->work, msecs_to_jiffies(50));
}

static void da9052_onkey_work(struct work_struct *work)
{
	struct da9052_onkey *onkey = container_of(work, struct da9052_onkey,
						  work.work);

	da9052_onkey_query(onkey);
}

static irqreturn_t da9052_onkey_irq(int irq, void *data)
{
	struct da9052_onkey *onkey = data;

	da9052_onkey_query(onkey);

	return IRQ_HANDLED;
}

static int __devinit da9052_onkey_probe(struct platform_device *pdev)
{
	struct da9052 *da9052 = dev_get_drvdata(pdev->dev.parent);
	struct da9052_onkey *onkey;
	struct input_dev *input_dev;
	int irq;
	int error;

	if (!da9052) {
		dev_err(&pdev->dev, "Failed to get the driver's data\n");
		return -EINVAL;
	}

	irq = platform_get_irq_byname(pdev, "ONKEY");
	if (irq < 0) {
		dev_err(&pdev->dev,
			"Failed to get an IRQ for input device, %d\n", irq);
		return -EINVAL;
	}

	onkey = kzalloc(sizeof(*onkey), GFP_KERNEL);
	input_dev = input_allocate_device();
	if (!onkey || !input_dev) {
		dev_err(&pdev->dev, "Failed to allocate memory\n");
		error = -ENOMEM;
		goto err_free_mem;
	}

	onkey->input = input_dev;
	onkey->da9052 = da9052;
	onkey->irq = irq;
	INIT_DELAYED_WORK(&onkey->work, da9052_onkey_work);

	input_dev->name = "da9052-onkey";
	input_dev->phys = "da9052-onkey/input0";
	input_dev->dev.parent = &pdev->dev;

	input_dev->evbit[0] = BIT_MASK(EV_KEY);
	__set_bit(KEY_POWER, input_dev->keybit);

	error = request_threaded_irq(onkey->irq, NULL, da9052_onkey_irq,
				     IRQF_TRIGGER_LOW | IRQF_ONESHOT,
				     "ONKEY", onkey);
	if (error < 0) {
		dev_err(onkey->da9052->dev,
			"Failed to register ONKEY IRQ %d, error = %d\n",
			onkey->irq, error);
		goto err_free_mem;
	}

	error = input_register_device(onkey->input);
	if (error) {
		dev_err(&pdev->dev, "Unable to register input device, %d\n",
			error);
		goto err_free_irq;
	}

	platform_set_drvdata(pdev, onkey);
	return 0;

err_free_irq:
	free_irq(onkey->irq, onkey);
	cancel_delayed_work_sync(&onkey->work);
err_free_mem:
	input_free_device(input_dev);
	kfree(onkey);

	return error;
}

static int __devexit da9052_onkey_remove(struct platform_device *pdev)
{
	struct da9052_onkey *onkey = platform_get_drvdata(pdev);

	free_irq(onkey->irq, onkey);
	cancel_delayed_work_sync(&onkey->work);

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

	return 0;
}

static struct platform_driver da9052_onkey_driver = {
	.probe	= da9052_onkey_probe,
	.remove	= __devexit_p(da9052_onkey_remove),
	.driver = {
		.name	= "da9052-onkey",
		.owner	= THIS_MODULE,
	},
};
module_platform_driver(da9052_onkey_driver);

MODULE_AUTHOR("David Dajun Chen <dchen@diasemi.com>");
MODULE_DESCRIPTION("Onkey driver for DA9052");
MODULE_LICENSE("GPL");
MODULE_ALIAS("platform:da9052-onkey");