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/platform_device.h> 30 #include <linux/i2c/twl.h> 31 32 #define PWR_PWRON_IRQ (1 << 0) 33 34 #define STS_HW_CONDITIONS 0xf 35 36 static irqreturn_t powerbutton_irq(int irq, void *_pwr) 37 { 38 struct input_dev *pwr = _pwr; 39 int err; 40 u8 value; 41 42 err = twl_i2c_read_u8(TWL_MODULE_PM_MASTER, &value, STS_HW_CONDITIONS); 43 if (!err) { 44 pm_wakeup_event(pwr->dev.parent, 0); 45 input_report_key(pwr, KEY_POWER, value & PWR_PWRON_IRQ); 46 input_sync(pwr); 47 } else { 48 dev_err(pwr->dev.parent, "twl4030: i2c error %d while reading" 49 " TWL4030 PM_MASTER STS_HW_CONDITIONS register\n", err); 50 } 51 52 return IRQ_HANDLED; 53 } 54 55 static int twl4030_pwrbutton_probe(struct platform_device *pdev) 56 { 57 struct input_dev *pwr; 58 int irq = platform_get_irq(pdev, 0); 59 int err; 60 61 pwr = devm_input_allocate_device(&pdev->dev); 62 if (!pwr) { 63 dev_err(&pdev->dev, "Can't allocate power button\n"); 64 return -ENOMEM; 65 } 66 67 pwr->evbit[0] = BIT_MASK(EV_KEY); 68 pwr->keybit[BIT_WORD(KEY_POWER)] = BIT_MASK(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(&pwr->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 platform_set_drvdata(pdev, pwr); 89 device_init_wakeup(&pdev->dev, true); 90 91 return 0; 92 } 93 94 #ifdef CONFIG_OF 95 static const struct of_device_id twl4030_pwrbutton_dt_match_table[] = { 96 { .compatible = "ti,twl4030-pwrbutton" }, 97 {}, 98 }; 99 MODULE_DEVICE_TABLE(of, twl4030_pwrbutton_dt_match_table); 100 #endif 101 102 static struct platform_driver twl4030_pwrbutton_driver = { 103 .probe = twl4030_pwrbutton_probe, 104 .driver = { 105 .name = "twl4030_pwrbutton", 106 .of_match_table = of_match_ptr(twl4030_pwrbutton_dt_match_table), 107 }, 108 }; 109 module_platform_driver(twl4030_pwrbutton_driver); 110 111 MODULE_ALIAS("platform:twl4030_pwrbutton"); 112 MODULE_DESCRIPTION("Triton2 Power Button"); 113 MODULE_LICENSE("GPL"); 114 MODULE_AUTHOR("Peter De Schrijver <peter.de-schrijver@nokia.com>"); 115 MODULE_AUTHOR("Felipe Balbi <felipe.balbi@nokia.com>"); 116 117