LXR linux/drivers/input/misc/rave-sp-pwrbutton.c

   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");
  95