/** * twl4030-pwrbutton.c - TWL4030 Power Button Input Driver * * Copyright (C) 2008-2009 Nokia Corporation * * Written by Peter De Schrijver <peter.de-schrijver@nokia.com> * Several fixes by Felipe Balbi <felipe.balbi@nokia.com> * * 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. * * You should have received a copy of the GNU General Public License * along with this program; if not, write to the Free Software * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA */ #include <linux/module.h> #include <linux/init.h> #include <linux/kernel.h> #include <linux/errno.h> #include <linux/input.h> #include <linux/interrupt.h> #include <linux/platform_device.h> #include <linux/i2c/twl4030.h> #define PWR_PWRON_IRQ (1 << 0) #define STS_HW_CONDITIONS 0xf static irqreturn_t powerbutton_irq(int irq, void *_pwr) { struct input_dev *pwr = _pwr; int err; u8 value; #ifdef CONFIG_LOCKDEP /* WORKAROUND for lockdep forcing IRQF_DISABLED on us, which * we don't want and can't tolerate since this is a threaded * IRQ and can sleep due to the i2c reads it has to issue. * Although it might be friendlier not to borrow this thread * context... */ local_irq_enable(); #endif err = twl4030_i2c_read_u8(TWL4030_MODULE_PM_MASTER, &value, STS_HW_CONDITIONS); if (!err) { input_report_key(pwr, KEY_POWER, value & PWR_PWRON_IRQ); input_sync(pwr); } else { dev_err(pwr->dev.parent, "twl4030: i2c error %d while reading" " TWL4030 PM_MASTER STS_HW_CONDITIONS register\n", err); } return IRQ_HANDLED; } static int __devinit twl4030_pwrbutton_probe(struct platform_device *pdev) { struct input_dev *pwr; int irq = platform_get_irq(pdev, 0); int err; pwr = input_allocate_device(); if (!pwr) { dev_dbg(&pdev->dev, "Can't allocate power button\n"); return -ENOMEM; } pwr->evbit[0] = BIT_MASK(EV_KEY); pwr->keybit[BIT_WORD(KEY_POWER)] = BIT_MASK(KEY_POWER); pwr->name = "twl4030_pwrbutton"; pwr->phys = "twl4030_pwrbutton/input0"; pwr->dev.parent = &pdev->dev; err = request_irq(irq, powerbutton_irq, IRQF_TRIGGER_FALLING | IRQF_TRIGGER_RISING, "twl4030_pwrbutton", pwr); if (err < 0) { dev_dbg(&pdev->dev, "Can't get IRQ for pwrbutton: %d\n", err); goto free_input_dev; } err = input_register_device(pwr); if (err) { dev_dbg(&pdev->dev, "Can't register power button: %d\n", err); goto free_irq; } platform_set_drvdata(pdev, pwr); return 0; free_irq: free_irq(irq, NULL); free_input_dev: input_free_device(pwr); return err; } static int __devexit twl4030_pwrbutton_remove(struct platform_device *pdev) { struct input_dev *pwr = platform_get_drvdata(pdev); int irq = platform_get_irq(pdev, 0); free_irq(irq, pwr); input_unregister_device(pwr); return 0; } struct platform_driver twl4030_pwrbutton_driver = { .probe = twl4030_pwrbutton_probe, .remove = __devexit_p(twl4030_pwrbutton_remove), .driver = { .name = "twl4030_pwrbutton", .owner = THIS_MODULE, }, }; static int __init twl4030_pwrbutton_init(void) { return platform_driver_register(&twl4030_pwrbutton_driver); } module_init(twl4030_pwrbutton_init); static void __exit twl4030_pwrbutton_exit(void) { platform_driver_unregister(&twl4030_pwrbutton_driver); } module_exit(twl4030_pwrbutton_exit); MODULE_ALIAS("platform:twl4030_pwrbutton"); MODULE_DESCRIPTION("Triton2 Power Button"); MODULE_LICENSE("GPL"); MODULE_AUTHOR("Peter De Schrijver <peter.de-schrijver@nokia.com>"); MODULE_AUTHOR("Felipe Balbi <felipe.balbi@nokia.com>");