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/device.h>
11#include <linux/kernel.h>
12#include <linux/module.h>
13#include <linux/platform_device.h>
14#include <linux/input.h>
15#include <linux/interrupt.h>
16#include <linux/mfd/abx500/ab8500.h>
17#include <linux/of.h>
18#include <linux/slab.h>
19
20/**
21 * struct ab8500_ponkey - ab8500 ponkey information
22 * @input_dev: pointer to input device
23 * @ab8500: ab8500 parent
24 * @irq_dbf: irq number for falling transition
25 * @irq_dbr: irq number for rising transition
26 */
27struct ab8500_ponkey {
28	struct input_dev	*idev;
29	struct ab8500		*ab8500;
30	int			irq_dbf;
31	int			irq_dbr;
32};
33
34/* AB8500 gives us an interrupt when ONKEY is held */
35static irqreturn_t ab8500_ponkey_handler(int irq, void *data)
36{
37	struct ab8500_ponkey *ponkey = data;
38
39	if (irq == ponkey->irq_dbf)
40		input_report_key(ponkey->idev, KEY_POWER, true);
41	else if (irq == ponkey->irq_dbr)
42		input_report_key(ponkey->idev, KEY_POWER, false);
43
44	input_sync(ponkey->idev);
45
46	return IRQ_HANDLED;
47}
48
49static int ab8500_ponkey_probe(struct platform_device *pdev)
50{
51	struct ab8500 *ab8500 = dev_get_drvdata(pdev->dev.parent);
52	struct ab8500_ponkey *ponkey;
53	struct input_dev *input;
54	int irq_dbf, irq_dbr;
55	int error;
56
57	irq_dbf = platform_get_irq_byname(pdev, "ONKEY_DBF");
58	if (irq_dbf < 0) {
59		dev_err(&pdev->dev, "No IRQ for ONKEY_DBF, error=%d\n", irq_dbf);
60		return irq_dbf;
61	}
62
63	irq_dbr = platform_get_irq_byname(pdev, "ONKEY_DBR");
64	if (irq_dbr < 0) {
65		dev_err(&pdev->dev, "No IRQ for ONKEY_DBR, error=%d\n", irq_dbr);
66		return irq_dbr;
67	}
68
69	ponkey = devm_kzalloc(&pdev->dev, sizeof(struct ab8500_ponkey),
70			      GFP_KERNEL);
71	if (!ponkey)
72		return -ENOMEM;
73
74	input = devm_input_allocate_device(&pdev->dev);
75	if (!input)
76		return -ENOMEM;
77
78	ponkey->idev = input;
79	ponkey->ab8500 = ab8500;
80	ponkey->irq_dbf = irq_dbf;
81	ponkey->irq_dbr = irq_dbr;
82
83	input->name = "AB8500 POn(PowerOn) Key";
84	input->dev.parent = &pdev->dev;
85
86	input_set_capability(input, EV_KEY, KEY_POWER);
87
88	error = devm_request_any_context_irq(&pdev->dev, ponkey->irq_dbf,
89					     ab8500_ponkey_handler, 0,
90					     "ab8500-ponkey-dbf", ponkey);
91	if (error < 0) {
92		dev_err(ab8500->dev, "Failed to request dbf IRQ#%d: %d\n",
93			ponkey->irq_dbf, error);
94		return error;
95	}
96
97	error = devm_request_any_context_irq(&pdev->dev, ponkey->irq_dbr,
98					     ab8500_ponkey_handler, 0,
99					     "ab8500-ponkey-dbr", ponkey);
100	if (error < 0) {
101		dev_err(ab8500->dev, "Failed to request dbr IRQ#%d: %d\n",
102			ponkey->irq_dbr, error);
103		return error;
104	}
105
106	error = input_register_device(ponkey->idev);
107	if (error) {
108		dev_err(ab8500->dev, "Can't register input device: %d\n", error);
109		return error;
110	}
111
112	platform_set_drvdata(pdev, ponkey);
113	return 0;
114}
115
116#ifdef CONFIG_OF
117static const struct of_device_id ab8500_ponkey_match[] = {
118	{ .compatible = "stericsson,ab8500-ponkey", },
119	{}
120};
121#endif
122
123static struct platform_driver ab8500_ponkey_driver = {
124	.driver		= {
125		.name	= "ab8500-poweron-key",
126		.of_match_table = of_match_ptr(ab8500_ponkey_match),
127	},
128	.probe		= ab8500_ponkey_probe,
129};
130module_platform_driver(ab8500_ponkey_driver);
131
132MODULE_LICENSE("GPL v2");
133MODULE_AUTHOR("Sundar Iyer <sundar.iyer@stericsson.com>");
134MODULE_DESCRIPTION("ST-Ericsson AB8500 Power-ON(Pon) Key driver");
135