/* * Retu power button driver. * * Copyright (C) 2004-2010 Nokia Corporation * * Original code written by Ari Saastamoinen, Juha Yrjölä and Felipe Balbi. * Rewritten by Aaro Koskinen. * * This file is subject to the terms and conditions of the GNU General * Public License. See the file "COPYING" in the main directory of this * archive for more details. * * This program is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * GNU General Public License for more details. */ #include <linux/irq.h> #include <linux/slab.h> #include <linux/errno.h> #include <linux/input.h> #include <linux/kernel.h> #include <linux/module.h> #include <linux/mfd/retu.h> #include <linux/interrupt.h> #include <linux/platform_device.h> #define RETU_STATUS_PWRONX (1 << 5) static irqreturn_t retu_pwrbutton_irq(int irq, void *_pwr) { struct input_dev *idev = _pwr; struct retu_dev *rdev = input_get_drvdata(idev); bool state; state = !(retu_read(rdev, RETU_REG_STATUS) & RETU_STATUS_PWRONX); input_report_key(idev, KEY_POWER, state); input_sync(idev); return IRQ_HANDLED; } static int retu_pwrbutton_probe(struct platform_device *pdev) { struct retu_dev *rdev = dev_get_drvdata(pdev->dev.parent); struct input_dev *idev; int irq; int error; irq = platform_get_irq(pdev, 0); if (irq < 0) return irq; idev = devm_input_allocate_device(&pdev->dev); if (!idev) return -ENOMEM; idev->name = "retu-pwrbutton"; idev->dev.parent = &pdev->dev; input_set_capability(idev, EV_KEY, KEY_POWER); input_set_drvdata(idev, rdev); error = devm_request_threaded_irq(&pdev->dev, irq, NULL, retu_pwrbutton_irq, IRQF_ONESHOT, "retu-pwrbutton", idev); if (error) return error; error = input_register_device(idev); if (error) return error; return 0; } static int retu_pwrbutton_remove(struct platform_device *pdev) { return 0; } static struct platform_driver retu_pwrbutton_driver = { .probe = retu_pwrbutton_probe, .remove = retu_pwrbutton_remove, .driver = { .name = "retu-pwrbutton", }, }; module_platform_driver(retu_pwrbutton_driver); MODULE_ALIAS("platform:retu-pwrbutton"); MODULE_DESCRIPTION("Retu Power Button"); MODULE_AUTHOR("Ari Saastamoinen"); MODULE_AUTHOR("Felipe Balbi"); MODULE_AUTHOR("Aaro Koskinen <aaro.koskinen@iki.fi>"); MODULE_LICENSE("GPL"); |