| 1 | // SPDX-License-Identifier: GPL-2.0+ |
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| 2 | // |
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| 3 | // Power Button driver for RAVE SP |
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| 4 | // |
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| 5 | // Copyright (C) 2017 Zodiac Inflight Innovations |
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| 6 | // |
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| 7 | // |
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| 8 | |
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| 9 | #include <linux/input.h> |
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| 10 | #include <linux/kernel.h> |
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| 11 | #include <linux/module.h> |
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| 12 | #include <linux/mfd/rave-sp.h> |
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| 13 | #include <linux/platform_device.h> |
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| 14 | |
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| 15 | #define RAVE_SP_EVNT_BUTTON_PRESS (RAVE_SP_EVNT_BASE + 0x00) |
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| 16 | |
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| 17 | struct rave_sp_power_button { |
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| 18 | struct input_dev *idev; |
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| 19 | struct notifier_block nb; |
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| 20 | }; |
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| 21 | |
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| 22 | static int rave_sp_power_button_event(struct notifier_block *nb, |
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| 23 | unsigned long action, void *data) |
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| 24 | { |
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| 25 | struct rave_sp_power_button *pb = |
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| 26 | container_of(nb, struct rave_sp_power_button, nb); |
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| 27 | const u8 event = rave_sp_action_unpack_event(action); |
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| 28 | const u8 value = rave_sp_action_unpack_value(action); |
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| 29 | struct input_dev *idev = pb->idev; |
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| 30 | |
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| 31 | if (event == RAVE_SP_EVNT_BUTTON_PRESS) { |
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| 32 | input_report_key(dev: idev, KEY_POWER, value); |
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| 33 | input_sync(dev: idev); |
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| 34 | |
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| 35 | return NOTIFY_STOP; |
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| 36 | } |
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| 37 | |
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| 38 | return NOTIFY_DONE; |
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| 39 | } |
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| 40 | |
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| 41 | static int rave_sp_pwrbutton_probe(struct platform_device *pdev) |
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| 42 | { |
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| 43 | struct device *dev = &pdev->dev; |
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| 44 | struct rave_sp_power_button *pb; |
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| 45 | struct input_dev *idev; |
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| 46 | int error; |
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| 47 | |
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| 48 | pb = devm_kzalloc(dev, size: sizeof(*pb), GFP_KERNEL); |
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| 49 | if (!pb) |
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| 50 | return -ENOMEM; |
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| 51 | |
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| 52 | idev = devm_input_allocate_device(dev); |
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| 53 | if (!idev) |
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| 54 | return -ENOMEM; |
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| 55 | |
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| 56 | idev->name = pdev->name; |
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| 57 | |
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| 58 | input_set_capability(dev: idev, EV_KEY, KEY_POWER); |
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| 59 | |
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| 60 | error = input_register_device(idev); |
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| 61 | if (error) |
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| 62 | return error; |
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| 63 | |
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| 64 | pb->idev = idev; |
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| 65 | pb->nb.notifier_call = rave_sp_power_button_event; |
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| 66 | pb->nb.priority = 128; |
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| 67 | |
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| 68 | error = devm_rave_sp_register_event_notifier(dev, nb: &pb->nb); |
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| 69 | if (error) |
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| 70 | return error; |
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| 71 | |
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| 72 | return 0; |
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| 73 | } |
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| 74 | |
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| 75 | static const struct of_device_id rave_sp_pwrbutton_of_match[] = { |
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| 76 | { .compatible = "zii,rave-sp-pwrbutton" }, |
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| 77 | {} |
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| 78 | }; |
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| 79 | |
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| 80 | static struct platform_driver rave_sp_pwrbutton_driver = { |
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| 81 | .probe = rave_sp_pwrbutton_probe, |
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| 82 | .driver = { |
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| 83 | .name = KBUILD_MODNAME, |
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| 84 | .of_match_table = rave_sp_pwrbutton_of_match, |
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| 85 | }, |
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| 86 | }; |
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| 87 | module_platform_driver(rave_sp_pwrbutton_driver); |
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| 88 | |
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| 89 | MODULE_DEVICE_TABLE(of, rave_sp_pwrbutton_of_match); |
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| 90 | MODULE_LICENSE("GPL" ); |
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| 91 | MODULE_AUTHOR("Andrey Vostrikov <andrey.vostrikov@cogentembedded.com>" ); |
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| 92 | MODULE_AUTHOR("Nikita Yushchenko <nikita.yoush@cogentembedded.com>" ); |
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| 93 | MODULE_AUTHOR("Andrey Smirnov <andrew.smirnov@gmail.com>" ); |
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| 94 | MODULE_DESCRIPTION("RAVE SP Power Button driver" ); |
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| 95 | |
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