1// SPDX-License-Identifier: GPL-2.0-only
2/*
3 * Copyright (C) ST-Ericsson SA 2010
4 *
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 * @idev: 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		return irq_dbf;
60
61	irq_dbr = platform_get_irq_byname(pdev, "ONKEY_DBR");
62	if (irq_dbr < 0)
63		return irq_dbr;
64
65	ponkey = devm_kzalloc(&pdev->dev, sizeof(struct ab8500_ponkey),
66			      GFP_KERNEL);
67	if (!ponkey)
68		return -ENOMEM;
69
70	input = devm_input_allocate_device(&pdev->dev);
71	if (!input)
72		return -ENOMEM;
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 = devm_request_any_context_irq(&pdev->dev, ponkey->irq_dbf,
85					     ab8500_ponkey_handler, 0,
86					     "ab8500-ponkey-dbf", ponkey);
87	if (error < 0) {
88		dev_err(ab8500->dev, "Failed to request dbf IRQ#%d: %d\n",
89			ponkey->irq_dbf, error);
90		return error;
91	}
92
93	error = devm_request_any_context_irq(&pdev->dev, ponkey->irq_dbr,
94					     ab8500_ponkey_handler, 0,
95					     "ab8500-ponkey-dbr", ponkey);
96	if (error < 0) {
97		dev_err(ab8500->dev, "Failed to request dbr IRQ#%d: %d\n",
98			ponkey->irq_dbr, error);
99		return error;
100	}
101
102	error = input_register_device(ponkey->idev);
103	if (error) {
104		dev_err(ab8500->dev, "Can't register input device: %d\n", error);
105		return error;
106	}
107
108	return 0;
109}
110
111#ifdef CONFIG_OF
112static const struct of_device_id ab8500_ponkey_match[] = {
113	{ .compatible = "stericsson,ab8500-ponkey", },
114	{}
115};
116MODULE_DEVICE_TABLE(of, ab8500_ponkey_match);
117#endif
118
119static struct platform_driver ab8500_ponkey_driver = {
120	.driver		= {
121		.name	= "ab8500-poweron-key",
122		.of_match_table = of_match_ptr(ab8500_ponkey_match),
123	},
124	.probe		= ab8500_ponkey_probe,
125};
126module_platform_driver(ab8500_ponkey_driver);
127
128MODULE_LICENSE("GPL v2");
129MODULE_AUTHOR("Sundar Iyer <sundar.iyer@stericsson.com>");
130MODULE_DESCRIPTION("ST-Ericsson AB8500 Power-ON(Pon) Key driver");
131