1 /* 2 * 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/bits.h> 24 #include <linux/module.h> 25 #include <linux/init.h> 26 #include <linux/kernel.h> 27 #include <linux/errno.h> 28 #include <linux/input.h> 29 #include <linux/interrupt.h> 30 #include <linux/mod_devicetable.h> 31 #include <linux/property.h> 32 #include <linux/platform_device.h> 33 #include <linux/mfd/twl.h> 34 35 #define PWR_PWRON_IRQ BIT(0) 36 37 struct twl_pwrbutton_chipdata { 38 u8 status_reg; 39 bool need_manual_irq; 40 }; 41 42 static const struct twl_pwrbutton_chipdata twl4030_chipdata = { 43 .status_reg = 0xf, 44 .need_manual_irq = false, 45 }; 46 47 static const struct twl_pwrbutton_chipdata twl6030_chipdata = { 48 .status_reg = 0x2, 49 .need_manual_irq = true, 50 }; 51 52 static irqreturn_t powerbutton_irq(int irq, void *_pwr) 53 { 54 struct input_dev *pwr = _pwr; 55 const struct twl_pwrbutton_chipdata *pdata = dev_get_drvdata(pwr->dev.parent); 56 int err; 57 u8 value; 58 59 err = twl_i2c_read_u8(TWL_MODULE_PM_MASTER, &value, pdata->status_reg); 60 if (!err) { 61 pm_wakeup_event(pwr->dev.parent, 0); 62 input_report_key(pwr, KEY_POWER, value & PWR_PWRON_IRQ); 63 input_sync(pwr); 64 } else { 65 dev_err(pwr->dev.parent, "twl4030: i2c error %d while reading" 66 " TWL4030 PM_MASTER STS_HW_CONDITIONS register\n", err); 67 } 68 69 return IRQ_HANDLED; 70 } 71 72 static int twl4030_pwrbutton_probe(struct platform_device *pdev) 73 { 74 const struct twl_pwrbutton_chipdata *pdata; 75 struct input_dev *pwr; 76 int irq = platform_get_irq(pdev, 0); 77 int err; 78 79 pdata = device_get_match_data(&pdev->dev); 80 if (!pdata) 81 return -EINVAL; 82 83 platform_set_drvdata(pdev, (void *)pdata); 84 85 pwr = devm_input_allocate_device(&pdev->dev); 86 if (!pwr) { 87 dev_err(&pdev->dev, "Can't allocate power button\n"); 88 return -ENOMEM; 89 } 90 91 input_set_capability(pwr, EV_KEY, KEY_POWER); 92 pwr->name = "twl4030_pwrbutton"; 93 pwr->phys = "twl4030_pwrbutton/input0"; 94 pwr->dev.parent = &pdev->dev; 95 96 err = devm_request_threaded_irq(&pdev->dev, irq, NULL, powerbutton_irq, 97 IRQF_TRIGGER_FALLING | IRQF_TRIGGER_RISING | 98 IRQF_ONESHOT, 99 "twl4030_pwrbutton", pwr); 100 if (err < 0) { 101 dev_err(&pdev->dev, "Can't get IRQ for pwrbutton: %d\n", err); 102 return err; 103 } 104 105 err = input_register_device(pwr); 106 if (err) { 107 dev_err(&pdev->dev, "Can't register power button: %d\n", err); 108 return err; 109 } 110 111 if (pdata->need_manual_irq) { 112 err = twl6030_interrupt_unmask(0x01, REG_INT_MSK_LINE_A); 113 if (err) 114 return err; 115 116 err = twl6030_interrupt_unmask(0x01, REG_INT_MSK_STS_A); 117 if (err) 118 return err; 119 } 120 121 device_init_wakeup(&pdev->dev, true); 122 123 return 0; 124 } 125 126 static void twl4030_pwrbutton_remove(struct platform_device *pdev) 127 { 128 const struct twl_pwrbutton_chipdata *pdata = platform_get_drvdata(pdev); 129 130 if (pdata->need_manual_irq) { 131 twl6030_interrupt_mask(0x01, REG_INT_MSK_LINE_A); 132 twl6030_interrupt_mask(0x01, REG_INT_MSK_STS_A); 133 } 134 } 135 136 static const struct of_device_id twl4030_pwrbutton_dt_match_table[] = { 137 { 138 .compatible = "ti,twl4030-pwrbutton", 139 .data = &twl4030_chipdata, 140 }, 141 { 142 .compatible = "ti,twl6030-pwrbutton", 143 .data = &twl6030_chipdata, 144 }, 145 { } 146 }; 147 MODULE_DEVICE_TABLE(of, twl4030_pwrbutton_dt_match_table); 148 149 static struct platform_driver twl4030_pwrbutton_driver = { 150 .probe = twl4030_pwrbutton_probe, 151 .remove = twl4030_pwrbutton_remove, 152 .driver = { 153 .name = "twl4030_pwrbutton", 154 .of_match_table = twl4030_pwrbutton_dt_match_table, 155 }, 156 }; 157 module_platform_driver(twl4030_pwrbutton_driver); 158 159 MODULE_ALIAS("platform:twl4030_pwrbutton"); 160 MODULE_DESCRIPTION("Triton2 Power Button"); 161 MODULE_LICENSE("GPL"); 162 MODULE_AUTHOR("Peter De Schrijver <peter.de-schrijver@nokia.com>"); 163 MODULE_AUTHOR("Felipe Balbi <felipe.balbi@nokia.com>"); 164 165