1/*
2 * Copyright (C) ST-Ericsson SA 2010
3 *
4 * License Terms: GNU General Public License v2
5 * Author: Sundar Iyer <sundar.iyer@stericsson.com> for ST-Ericsson
6 *
7 * AB8500 Power-On Key handler
8 */
9
10#include <linux/kernel.h>
11#include <linux/module.h>
12#include <linux/platform_device.h>
13#include <linux/input.h>
14#include <linux/interrupt.h>
15#include <linux/mfd/abx500/ab8500.h>
16#include <linux/slab.h>
17
18/**
19 * struct ab8500_ponkey - ab8500 ponkey information
20 * @input_dev: pointer to input device
21 * @ab8500: ab8500 parent
22 * @irq_dbf: irq number for falling transition
23 * @irq_dbr: irq number for rising transition
24 */
25struct ab8500_ponkey {
26	struct input_dev	*idev;
27	struct ab8500		*ab8500;
28	int			irq_dbf;
29	int			irq_dbr;
30};
31
32/* AB8500 gives us an interrupt when ONKEY is held */
33static irqreturn_t ab8500_ponkey_handler(int irq, void *data)
34{
35	struct ab8500_ponkey *ponkey = data;
36
37	if (irq == ponkey->irq_dbf)
38		input_report_key(ponkey->idev, KEY_POWER, true);
39	else if (irq == ponkey->irq_dbr)
40		input_report_key(ponkey->idev, KEY_POWER, false);
41
42	input_sync(ponkey->idev);
43
44	return IRQ_HANDLED;
45}
46
47static int __devinit ab8500_ponkey_probe(struct platform_device *pdev)
48{
49	struct ab8500 *ab8500 = dev_get_drvdata(pdev->dev.parent);
50	struct ab8500_ponkey *ponkey;
51	struct input_dev *input;
52	int irq_dbf, irq_dbr;
53	int error;
54
55	irq_dbf = platform_get_irq_byname(pdev, "ONKEY_DBF");
56	if (irq_dbf < 0) {
57		dev_err(&pdev->dev, "No IRQ for ONKEY_DBF, error=%d\n", irq_dbf);
58		return irq_dbf;
59	}
60
61	irq_dbr = platform_get_irq_byname(pdev, "ONKEY_DBR");
62	if (irq_dbr < 0) {
63		dev_err(&pdev->dev, "No IRQ for ONKEY_DBR, error=%d\n", irq_dbr);
64		return irq_dbr;
65	}
66
67	ponkey = kzalloc(sizeof(struct ab8500_ponkey), GFP_KERNEL);
68	input = input_allocate_device();
69	if (!ponkey || !input) {
70		error = -ENOMEM;
71		goto err_free_mem;
72	}
73
74	ponkey->idev = input;
75	ponkey->ab8500 = ab8500;
76	ponkey->irq_dbf = irq_dbf;
77	ponkey->irq_dbr = irq_dbr;
78
79	input->name = "AB8500 POn(PowerOn) Key";
80	input->dev.parent = &pdev->dev;
81
82	input_set_capability(input, EV_KEY, KEY_POWER);
83
84	error = request_any_context_irq(ponkey->irq_dbf, ab8500_ponkey_handler,
85					0, "ab8500-ponkey-dbf", ponkey);
86	if (error < 0) {
87		dev_err(ab8500->dev, "Failed to request dbf IRQ#%d: %d\n",
88			ponkey->irq_dbf, error);
89		goto err_free_mem;
90	}
91
92	error = request_any_context_irq(ponkey->irq_dbr, ab8500_ponkey_handler,
93					0, "ab8500-ponkey-dbr", ponkey);
94	if (error < 0) {
95		dev_err(ab8500->dev, "Failed to request dbr IRQ#%d: %d\n",
96			ponkey->irq_dbr, error);
97		goto err_free_dbf_irq;
98	}
99
100	error = input_register_device(ponkey->idev);
101	if (error) {
102		dev_err(ab8500->dev, "Can't register input device: %d\n", error);
103		goto err_free_dbr_irq;
104	}
105
106	platform_set_drvdata(pdev, ponkey);
107	return 0;
108
109err_free_dbr_irq:
110	free_irq(ponkey->irq_dbr, ponkey);
111err_free_dbf_irq:
112	free_irq(ponkey->irq_dbf, ponkey);
113err_free_mem:
114	input_free_device(input);
115	kfree(ponkey);
116
117	return error;
118}
119
120static int __devexit ab8500_ponkey_remove(struct platform_device *pdev)
121{
122	struct ab8500_ponkey *ponkey = platform_get_drvdata(pdev);
123
124	free_irq(ponkey->irq_dbf, ponkey);
125	free_irq(ponkey->irq_dbr, ponkey);
126	input_unregister_device(ponkey->idev);
127	kfree(ponkey);
128
129	platform_set_drvdata(pdev, NULL);
130
131	return 0;
132}
133
134static struct platform_driver ab8500_ponkey_driver = {
135	.driver		= {
136		.name	= "ab8500-poweron-key",
137		.owner	= THIS_MODULE,
138	},
139	.probe		= ab8500_ponkey_probe,
140	.remove		= __devexit_p(ab8500_ponkey_remove),
141};
142module_platform_driver(ab8500_ponkey_driver);
143
144MODULE_LICENSE("GPL v2");
145MODULE_AUTHOR("Sundar Iyer <sundar.iyer@stericsson.com>");
146MODULE_DESCRIPTION("ST-Ericsson AB8500 Power-ON(Pon) Key driver");
147