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Linux/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, 0,
 67                                           "retu-pwrbutton", idev);
 68         if (error)
 69                 return error;
 70 
 71         error = input_register_device(idev);
 72         if (error)
 73                 return error;
 74 
 75         return 0;
 76 }
 77 
 78 static int retu_pwrbutton_remove(struct platform_device *pdev)
 79 {
 80         return 0;
 81 }
 82 
 83 static struct platform_driver retu_pwrbutton_driver = {
 84         .probe          = retu_pwrbutton_probe,
 85         .remove         = retu_pwrbutton_remove,
 86         .driver         = {
 87                 .name   = "retu-pwrbutton",
 88                 .owner  = THIS_MODULE,
 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");
 99 

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