1 /** 2 * twl4030-pwrbutton.c - TWL4030 Power Button Input Driver 3 * 4 * Copyright (C) 2008-2009 Nokia Corporation 5 * 6 * Written by Peter De Schrijver <peter.de-schrijver@nokia.com> 7 * Several fixes by Felipe Balbi <felipe.balbi@nokia.com> 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 * You should have received a copy of the GNU General Public License 19 * along with this program; if not, write to the Free Software 20 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA 21 */ 22 23 #include <linux/module.h> 24 #include <linux/init.h> 25 #include <linux/kernel.h> 26 #include <linux/errno.h> 27 #include <linux/input.h> 28 #include <linux/interrupt.h> 29 #include <linux/of.h> 30 #include <linux/platform_device.h> 31 #include <linux/mfd/twl.h> 32 33 #define PWR_PWRON_IRQ (1 << 0) 34 35 #define STS_HW_CONDITIONS 0xf 36 37 static irqreturn_t powerbutton_irq(int irq, void *_pwr) 38 { 39 struct input_dev *pwr = _pwr; 40 int err; 41 u8 value; 42 43 err = twl_i2c_read_u8(TWL_MODULE_PM_MASTER, &value, STS_HW_CONDITIONS); 44 if (!err) { 45 pm_wakeup_event(pwr->dev.parent, 0); 46 input_report_key(pwr, KEY_POWER, value & PWR_PWRON_IRQ); 47 input_sync(pwr); 48 } else { 49 dev_err(pwr->dev.parent, "twl4030: i2c error %d while reading" 50 " TWL4030 PM_MASTER STS_HW_CONDITIONS register\n", err); 51 } 52 53 return IRQ_HANDLED; 54 } 55 56 static int twl4030_pwrbutton_probe(struct platform_device *pdev) 57 { 58 struct input_dev *pwr; 59 int irq = platform_get_irq(pdev, 0); 60 int err; 61 62 pwr = devm_input_allocate_device(&pdev->dev); 63 if (!pwr) { 64 dev_err(&pdev->dev, "Can't allocate power button\n"); 65 return -ENOMEM; 66 } 67 68 input_set_capability(pwr, EV_KEY, KEY_POWER); 69 pwr->name = "twl4030_pwrbutton"; 70 pwr->phys = "twl4030_pwrbutton/input0"; 71 pwr->dev.parent = &pdev->dev; 72 73 err = devm_request_threaded_irq(&pdev->dev, irq, NULL, powerbutton_irq, 74 IRQF_TRIGGER_FALLING | IRQF_TRIGGER_RISING | 75 IRQF_ONESHOT, 76 "twl4030_pwrbutton", pwr); 77 if (err < 0) { 78 dev_err(&pdev->dev, "Can't get IRQ for pwrbutton: %d\n", err); 79 return err; 80 } 81 82 err = input_register_device(pwr); 83 if (err) { 84 dev_err(&pdev->dev, "Can't register power button: %d\n", err); 85 return err; 86 } 87 88 device_init_wakeup(&pdev->dev, true); 89 90 return 0; 91 } 92 93 #ifdef CONFIG_OF 94 static const struct of_device_id twl4030_pwrbutton_dt_match_table[] = { 95 { .compatible = "ti,twl4030-pwrbutton" }, 96 {}, 97 }; 98 MODULE_DEVICE_TABLE(of, twl4030_pwrbutton_dt_match_table); 99 #endif 100 101 static struct platform_driver twl4030_pwrbutton_driver = { 102 .probe = twl4030_pwrbutton_probe, 103 .driver = { 104 .name = "twl4030_pwrbutton", 105 .of_match_table = of_match_ptr(twl4030_pwrbutton_dt_match_table), 106 }, 107 }; 108 module_platform_driver(twl4030_pwrbutton_driver); 109 110 MODULE_ALIAS("platform:twl4030_pwrbutton"); 111 MODULE_DESCRIPTION("Triton2 Power Button"); 112 MODULE_LICENSE("GPL"); 113 MODULE_AUTHOR("Peter De Schrijver <peter.de-schrijver@nokia.com>"); 114 MODULE_AUTHOR("Felipe Balbi <felipe.balbi@nokia.com>"); 115 116