drivers/input/misc/retu-pwrbutton.c

   1 /*
   2  * Retu power button driver.
   3  *
   4  * Copyright (C) 2004-2010 Nokia Corporation
   5  *
   6  * Original code written by Ari Saastamoinen, Juha Yrjölä 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
  31 static 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
  44 static 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
  79 static int retu_pwrbutton_remove(struct platform_device *pdev)
  80 {
  81         return 0;
  82 }
  83
  84 static struct platform_driver retu_pwrbutton_driver = {
  85         .probe          = retu_pwrbutton_probe,
  86         .remove         = retu_pwrbutton_remove,
  87         .driver         = {
  88                 .name   = "retu-pwrbutton",
  89         },
  90 };
  91 module_platform_driver(retu_pwrbutton_driver);
  92
  93 MODULE_ALIAS("platform:retu-pwrbutton");
  94 MODULE_DESCRIPTION("Retu Power Button");
  95 MODULE_AUTHOR("Ari Saastamoinen");
  96 MODULE_AUTHOR("Felipe Balbi");
  97 MODULE_AUTHOR("Aaro Koskinen <aaro.koskinen@iki.fi>");
  98 MODULE_LICENSE("GPL");