Andrey Smirnov | 62f0f07 | 2018-03-07 11:56:55 -0800 | [diff] [blame] | 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"); |