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(map: regmap, PM886_REG_STATUS1, val: &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(dev: idev, KEY_POWER, value: val);
32 input_sync(dev: 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(dev: 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, size: 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, err: irq, fmt: "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(dev: idev, EV_KEY, KEY_POWER);
67
68 err = devm_request_threaded_irq(dev, irq, NULL, thread_fn: pm886_onkey_irq_handler,
69 IRQF_ONESHOT | IRQF_NO_SUSPEND, devname: "onkey",
70 dev_id: onkey);
71 if (err)
72 return dev_err_probe(dev, err, fmt: "Failed to request IRQ\n");
73
74 err = input_register_device(idev);
75 if (err)
76 return dev_err_probe(dev, err, fmt: "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");
99

source code of linux/drivers/input/misc/88pm886-onkey.c