linux/drivers/input/misc/retu-pwrbutton.c
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   1/*
   2 * Retu power button driver.
   3 *
   4 * Copyright (C) 2004-2010 Nokia Corporation
   5 *
   6 * Original code written by Ari Saastamoinen, Juha Yrj\xC3\xB6l\xC3\xA4 and Felipe Balbi.
   7 * Rewritten by Aaro Koskinen.
   8 *
   9 * This file is subject to the terms and conditions of the GNU General
  10 * Public License. See the file "COPYING" in the main directory of this
  11 * archive for more details.
  12 *
  13 * This program is distributed in the hope that it will be useful,
  14 * but WITHOUT ANY WARRANTY; without even the implied warranty of
  15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
  16 * GNU General Public License for more details.
  17 */
  18
  19#include <linux/irq.h>
  20#include <linux/slab.h>
  21#include <linux/errno.h>
  22#include <linux/input.h>
  23#include <linux/kernel.h>
  24#include <linux/module.h>
  25#include <linux/mfd/retu.h>
  26#include <linux/interrupt.h>
  27#include <linux/platform_device.h>
  28
  29#define RETU_STATUS_PWRONX (1 << 5)
  30
  31static irqreturn_t retu_pwrbutton_irq(int irq, void *_pwr)
  32{
  33        struct input_dev *idev = _pwr;
  34        struct retu_dev *rdev = input_get_drvdata(idev);
  35        bool state;
  36
  37        state = !(retu_read(rdev, RETU_REG_STATUS) & RETU_STATUS_PWRONX);
  38        input_report_key(idev, KEY_POWER, state);
  39        input_sync(idev);
  40
  41        return IRQ_HANDLED;
  42}
  43
  44static int retu_pwrbutton_probe(struct platform_device *pdev)
  45{
  46        struct retu_dev *rdev = dev_get_drvdata(pdev->dev.parent);
  47        struct input_dev *idev;
  48        int irq;
  49        int error;
  50
  51        irq = platform_get_irq(pdev, 0);
  52        if (irq < 0)
  53                return irq;
  54
  55        idev = devm_input_allocate_device(&pdev->dev);
  56        if (!idev)
  57                return -ENOMEM;
  58
  59        idev->name = "retu-pwrbutton";
  60        idev->dev.parent = &pdev->dev;
  61
  62        input_set_capability(idev, EV_KEY, KEY_POWER);
  63        input_set_drvdata(idev, rdev);
  64
  65        error = devm_request_threaded_irq(&pdev->dev, irq,
  66                                          NULL, retu_pwrbutton_irq,
  67                                          IRQF_ONESHOT,
  68                                          "retu-pwrbutton", idev);
  69        if (error)
  70                return error;
  71
  72        error = input_register_device(idev);
  73        if (error)
  74                return error;
  75
  76        return 0;
  77}
  78
  79static struct platform_driver retu_pwrbutton_driver = {
  80        .probe          = retu_pwrbutton_probe,
  81        .driver         = {
  82                .name   = "retu-pwrbutton",
  83        },
  84};
  85module_platform_driver(retu_pwrbutton_driver);
  86
  87MODULE_ALIAS("platform:retu-pwrbutton");
  88MODULE_DESCRIPTION("Retu Power Button");
  89MODULE_AUTHOR("Ari Saastamoinen");
  90MODULE_AUTHOR("Felipe Balbi");
  91MODULE_AUTHOR("Aaro Koskinen <aaro.koskinen@iki.fi>");
  92MODULE_LICENSE("GPL");
  93