cachepc-linux

Fork of AMDESE/linux with modifications for CachePC side-channel attack
git clone https://git.sinitax.com/sinitax/cachepc-linux
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retu-pwrbutton.c (2330B)

      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
     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");