linux/drivers/input/misc/rk805-pwrkey.c
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   1// SPDX-License-Identifier: GPL-2.0-or-later
   2/*
   3 * Rockchip RK805 PMIC Power Key driver
   4 *
   5 * Copyright (c) 2017, Fuzhou Rockchip Electronics Co., Ltd
   6 *
   7 * Author: Joseph Chen <chenjh@rock-chips.com>
   8 */
   9
  10#include <linux/errno.h>
  11#include <linux/init.h>
  12#include <linux/input.h>
  13#include <linux/interrupt.h>
  14#include <linux/kernel.h>
  15#include <linux/module.h>
  16#include <linux/platform_device.h>
  17
  18static irqreturn_t pwrkey_fall_irq(int irq, void *_pwr)
  19{
  20        struct input_dev *pwr = _pwr;
  21
  22        input_report_key(pwr, KEY_POWER, 1);
  23        input_sync(pwr);
  24
  25        return IRQ_HANDLED;
  26}
  27
  28static irqreturn_t pwrkey_rise_irq(int irq, void *_pwr)
  29{
  30        struct input_dev *pwr = _pwr;
  31
  32        input_report_key(pwr, KEY_POWER, 0);
  33        input_sync(pwr);
  34
  35        return IRQ_HANDLED;
  36}
  37
  38static int rk805_pwrkey_probe(struct platform_device *pdev)
  39{
  40        struct input_dev *pwr;
  41        int fall_irq, rise_irq;
  42        int err;
  43
  44        pwr = devm_input_allocate_device(&pdev->dev);
  45        if (!pwr) {
  46                dev_err(&pdev->dev, "Can't allocate power button\n");
  47                return -ENOMEM;
  48        }
  49
  50        pwr->name = "rk805 pwrkey";
  51        pwr->phys = "rk805_pwrkey/input0";
  52        pwr->id.bustype = BUS_HOST;
  53        input_set_capability(pwr, EV_KEY, KEY_POWER);
  54
  55        fall_irq = platform_get_irq(pdev, 0);
  56        if (fall_irq < 0)
  57                return fall_irq;
  58
  59        rise_irq = platform_get_irq(pdev, 1);
  60        if (rise_irq < 0)
  61                return rise_irq;
  62
  63        err = devm_request_any_context_irq(&pwr->dev, fall_irq,
  64                                           pwrkey_fall_irq,
  65                                           IRQF_TRIGGER_FALLING | IRQF_ONESHOT,
  66                                           "rk805_pwrkey_fall", pwr);
  67        if (err < 0) {
  68                dev_err(&pdev->dev, "Can't register fall irq: %d\n", err);
  69                return err;
  70        }
  71
  72        err = devm_request_any_context_irq(&pwr->dev, rise_irq,
  73                                           pwrkey_rise_irq,
  74                                           IRQF_TRIGGER_RISING | IRQF_ONESHOT,
  75                                           "rk805_pwrkey_rise", pwr);
  76        if (err < 0) {
  77                dev_err(&pdev->dev, "Can't register rise irq: %d\n", err);
  78                return err;
  79        }
  80
  81        err = input_register_device(pwr);
  82        if (err) {
  83                dev_err(&pdev->dev, "Can't register power button: %d\n", err);
  84                return err;
  85        }
  86
  87        platform_set_drvdata(pdev, pwr);
  88        device_init_wakeup(&pdev->dev, true);
  89
  90        return 0;
  91}
  92
  93static struct platform_driver rk805_pwrkey_driver = {
  94        .probe  = rk805_pwrkey_probe,
  95        .driver = {
  96                .name = "rk805-pwrkey",
  97        },
  98};
  99module_platform_driver(rk805_pwrkey_driver);
 100
 101MODULE_AUTHOR("Joseph Chen <chenjh@rock-chips.com>");
 102MODULE_DESCRIPTION("RK805 PMIC Power Key driver");
 103MODULE_LICENSE("GPL");
 104