/** * 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/mfd/twl.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; err = twl_i2c_read_u8(TWL_MODULE_PM_MASTER, &value, STS_HW_CONDITIONS); if (!err) { pm_wakeup_event(pwr->dev.parent, 0); 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 twl4030_pwrbutton_probe(struct platform_device *pdev) { struct input_dev *pwr; int irq = platform_get_irq(pdev, 0); int err; pwr = devm_input_allocate_device(&pdev->dev); if (!pwr) { dev_err(&pdev->dev, "Can't allocate power button\n"); return -ENOMEM; } input_set_capability(pwr, EV_KEY, KEY_POWER); pwr->name = "twl4030_pwrbutton"; pwr->phys = "twl4030_pwrbutton/input0"; pwr->dev.parent = &pdev->dev; err = devm_request_threaded_irq(&pdev->dev, irq, NULL, powerbutton_irq, IRQF_TRIGGER_FALLING | IRQF_TRIGGER_RISING | IRQF_ONESHOT, "twl4030_pwrbutton", pwr); if (err < 0) { dev_err(&pdev->dev, "Can't get IRQ for pwrbutton: %d\n", err); return err; } err = input_register_device(pwr); if (err) { dev_err(&pdev->dev, "Can't register power button: %d\n", err); return err; } device_init_wakeup(&pdev->dev, true); return 0; } #ifdef CONFIG_OF static const struct of_device_id twl4030_pwrbutton_dt_match_table[] = { { .compatible = "ti,twl4030-pwrbutton" }, {}, }; MODULE_DEVICE_TABLE(of, twl4030_pwrbutton_dt_match_table); #endif static struct platform_driver twl4030_pwrbutton_driver = { .probe = twl4030_pwrbutton_probe, .driver = { .name = "twl4030_pwrbutton", .of_match_table = of_match_ptr(twl4030_pwrbutton_dt_match_table), }, }; module_platform_driver(twl4030_pwrbutton_driver); 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>");