1// SPDX-License-Identifier: GPL-2.0+
 2//
 3// Power Button driver for RAVE SP
 4//
 5// Copyright (C) 2017 Zodiac Inflight Innovations
 6//
 7//
 8
 9#include <linux/input.h>
10#include <linux/kernel.h>
11#include <linux/module.h>
12#include <linux/mfd/rave-sp.h>
13#include <linux/platform_device.h>
14
15#define RAVE_SP_EVNT_BUTTON_PRESS	(RAVE_SP_EVNT_BASE + 0x00)
16
17struct rave_sp_power_button {
18	struct input_dev *idev;
19	struct notifier_block nb;
20};
21
22static int rave_sp_power_button_event(struct notifier_block *nb,
23				      unsigned long action, void *data)
24{
25	struct rave_sp_power_button *pb =
26		container_of(nb, struct rave_sp_power_button, nb);
27	const u8 event = rave_sp_action_unpack_event(action);
28	const u8 value = rave_sp_action_unpack_value(action);
29	struct input_dev *idev = pb->idev;
30
31	if (event == RAVE_SP_EVNT_BUTTON_PRESS) {
32		input_report_key(idev, KEY_POWER, value);
33		input_sync(idev);
34
35		return NOTIFY_STOP;
36	}
37
38	return NOTIFY_DONE;
39}
40
41static int rave_sp_pwrbutton_probe(struct platform_device *pdev)
42{
43	struct device *dev = &pdev->dev;
44	struct rave_sp_power_button *pb;
45	struct input_dev *idev;
46	int error;
47
48	pb = devm_kzalloc(dev, sizeof(*pb), GFP_KERNEL);
49	if (!pb)
50		return -ENOMEM;
51
52	idev = devm_input_allocate_device(dev);
53	if (!idev)
54		return -ENOMEM;
55
56	idev->name = pdev->name;
57
58	input_set_capability(idev, EV_KEY, KEY_POWER);
59
60	error = input_register_device(idev);
61	if (error)
62		return error;
63
64	pb->idev = idev;
65	pb->nb.notifier_call = rave_sp_power_button_event;
66	pb->nb.priority = 128;
67
68	error = devm_rave_sp_register_event_notifier(dev, &pb->nb);
69	if (error)
70		return error;
71
72	return 0;
73}
74
75static const struct of_device_id rave_sp_pwrbutton_of_match[] = {
76	{ .compatible = "zii,rave-sp-pwrbutton" },
77	{}
78};
79
80static struct platform_driver rave_sp_pwrbutton_driver = {
81	.probe = rave_sp_pwrbutton_probe,
82	.driver	= {
83		.name = KBUILD_MODNAME,
84		.of_match_table = rave_sp_pwrbutton_of_match,
85	},
86};
87module_platform_driver(rave_sp_pwrbutton_driver);
88
89MODULE_DEVICE_TABLE(of, rave_sp_pwrbutton_of_match);
90MODULE_LICENSE("GPL");
91MODULE_AUTHOR("Andrey Vostrikov <andrey.vostrikov@cogentembedded.com>");
92MODULE_AUTHOR("Nikita Yushchenko <nikita.yoush@cogentembedded.com>");
93MODULE_AUTHOR("Andrey Smirnov <andrew.smirnov@gmail.com>");
94MODULE_DESCRIPTION("RAVE SP Power Button driver");