1// SPDX-License-Identifier: GPL-2.0-only
 2#include <linux/input.h>
 3#include <linux/interrupt.h>
 4#include <linux/irq.h>
 5#include <linux/platform_device.h>
 6#include <linux/regmap.h>
 7
 8#include <linux/mfd/88pm886.h>
 9
10struct pm886_onkey {
11	struct input_dev *idev;
12	struct pm886_chip *chip;
13};
14
15static irqreturn_t pm886_onkey_irq_handler(int irq, void *data)
16{
17	struct pm886_onkey *onkey = data;
18	struct regmap *regmap = onkey->chip->regmap;
19	struct input_dev *idev = onkey->idev;
20	struct device *parent = idev->dev.parent;
21	unsigned int val;
22	int err;
23
24	err = regmap_read(regmap, PM886_REG_STATUS1, &val);
25	if (err) {
26		dev_err(parent, "Failed to read status: %d\n", err);
27		return IRQ_NONE;
28	}
29	val &= PM886_ONKEY_STS1;
30
31	input_report_key(idev, KEY_POWER, val);
32	input_sync(idev);
33
34	return IRQ_HANDLED;
35}
36
37static int pm886_onkey_probe(struct platform_device *pdev)
38{
39	struct pm886_chip *chip = dev_get_drvdata(pdev->dev.parent);
40	struct device *dev = &pdev->dev;
41	struct pm886_onkey *onkey;
42	struct input_dev *idev;
43	int irq, err;
44
45	onkey = devm_kzalloc(dev, sizeof(*onkey), GFP_KERNEL);
46	if (!onkey)
47		return -ENOMEM;
48
49	onkey->chip = chip;
50
51	irq = platform_get_irq(pdev, 0);
52	if (irq < 0)
53		return dev_err_probe(dev, irq, "Failed to get IRQ\n");
54
55	idev = devm_input_allocate_device(dev);
56	if (!idev) {
57		dev_err(dev, "Failed to allocate input device\n");
58		return -ENOMEM;
59	}
60	onkey->idev = idev;
61
62	idev->name = "88pm886-onkey";
63	idev->phys = "88pm886-onkey/input0";
64	idev->id.bustype = BUS_I2C;
65
66	input_set_capability(idev, EV_KEY, KEY_POWER);
67
68	err = devm_request_threaded_irq(dev, irq, NULL, pm886_onkey_irq_handler,
69					IRQF_ONESHOT | IRQF_NO_SUSPEND, "onkey",
70					onkey);
71	if (err)
72		return dev_err_probe(dev, err, "Failed to request IRQ\n");
73
74	err = input_register_device(idev);
75	if (err)
76		return dev_err_probe(dev, err, "Failed to register input device\n");
77
78	return 0;
79}
80
81static const struct platform_device_id pm886_onkey_id_table[] = {
82	{ "88pm886-onkey", },
83	{ }
84};
85MODULE_DEVICE_TABLE(platform, pm886_onkey_id_table);
86
87static struct platform_driver pm886_onkey_driver = {
88	.driver = {
89		.name = "88pm886-onkey",
90	},
91	.probe = pm886_onkey_probe,
92	.id_table = pm886_onkey_id_table,
93};
94module_platform_driver(pm886_onkey_driver);
95
96MODULE_DESCRIPTION("Marvell 88PM886 onkey driver");
97MODULE_AUTHOR("Karel Balej <balejk@matfyz.cz>");
98MODULE_LICENSE("GPL");