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62f0f079 AS |
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 | ||
17 | struct rave_sp_power_button { | |
18 | struct input_dev *idev; | |
19 | struct notifier_block nb; | |
20 | }; | |
21 | ||
22 | static 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 | ||
41 | static 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 | ||
75 | static const struct of_device_id rave_sp_pwrbutton_of_match[] = { | |
76 | { .compatible = "zii,rave-sp-pwrbutton" }, | |
77 | {} | |
78 | }; | |
79 | ||
80 | static 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 | }; | |
87 | module_platform_driver(rave_sp_pwrbutton_driver); | |
88 | ||
89 | MODULE_DEVICE_TABLE(of, rave_sp_pwrbutton_of_match); | |
90 | MODULE_LICENSE("GPL"); | |
91 | MODULE_AUTHOR("Andrey Vostrikov <andrey.vostrikov@cogentembedded.com>"); | |
92 | MODULE_AUTHOR("Nikita Yushchenko <nikita.yoush@cogentembedded.com>"); | |
93 | MODULE_AUTHOR("Andrey Smirnov <andrew.smirnov@gmail.com>"); | |
94 | MODULE_DESCRIPTION("RAVE SP Power Button driver"); |