1 // SPDX-License-Identifier: GPL-2.0-only 2 /* 3 * Texas Instruments' TPS65217 and TPS65218 Power Button Input Driver 4 * 5 * Copyright (C) 2014 Texas Instruments Incorporated - http://www.ti.com/ 6 * Author: Felipe Balbi <balbi@ti.com> 7 * Author: Marcin Niestroj <m.niestroj@grinn-global.com> 8 */ 9 10 #include <linux/init.h> 11 #include <linux/input.h> 12 #include <linux/interrupt.h> 13 #include <linux/kernel.h> 14 #include <linux/mfd/tps65217.h> 15 #include <linux/mfd/tps65218.h> 16 #include <linux/module.h> 17 #include <linux/of.h> 18 #include <linux/platform_device.h> 19 #include <linux/regmap.h> 20 #include <linux/slab.h> 21 22 struct tps6521x_data { 23 unsigned int reg_status; 24 unsigned int pb_mask; 25 const char *name; 26 }; 27 28 static const struct tps6521x_data tps65217_data = { 29 .reg_status = TPS65217_REG_STATUS, 30 .pb_mask = TPS65217_STATUS_PB, 31 .name = "tps65217_pwrbutton", 32 }; 33 34 static const struct tps6521x_data tps65218_data = { 35 .reg_status = TPS65218_REG_STATUS, 36 .pb_mask = TPS65218_STATUS_PB_STATE, 37 .name = "tps65218_pwrbutton", 38 }; 39 40 struct tps6521x_pwrbutton { 41 struct device *dev; 42 struct regmap *regmap; 43 struct input_dev *idev; 44 const struct tps6521x_data *data; 45 char phys[32]; 46 }; 47 48 static const struct of_device_id of_tps6521x_pb_match[] = { 49 { .compatible = "ti,tps65217-pwrbutton", .data = &tps65217_data }, 50 { .compatible = "ti,tps65218-pwrbutton", .data = &tps65218_data }, 51 { }, 52 }; 53 MODULE_DEVICE_TABLE(of, of_tps6521x_pb_match); 54 55 static irqreturn_t tps6521x_pb_irq(int irq, void *_pwr) 56 { 57 struct tps6521x_pwrbutton *pwr = _pwr; 58 const struct tps6521x_data *tps_data = pwr->data; 59 unsigned int reg; 60 int error; 61 62 error = regmap_read(pwr->regmap, tps_data->reg_status, ®); 63 if (error) { 64 dev_err(pwr->dev, "can't read register: %d\n", error); 65 goto out; 66 } 67 68 if (reg & tps_data->pb_mask) { 69 input_report_key(pwr->idev, KEY_POWER, 1); 70 pm_wakeup_event(pwr->dev, 0); 71 } else { 72 input_report_key(pwr->idev, KEY_POWER, 0); 73 } 74 75 input_sync(pwr->idev); 76 77 out: 78 return IRQ_HANDLED; 79 } 80 81 static int tps6521x_pb_probe(struct platform_device *pdev) 82 { 83 struct device *dev = &pdev->dev; 84 struct tps6521x_pwrbutton *pwr; 85 struct input_dev *idev; 86 const struct of_device_id *match; 87 int error; 88 int irq; 89 90 match = of_match_node(of_tps6521x_pb_match, dev->of_node); 91 if (!match) 92 return -ENXIO; 93 94 pwr = devm_kzalloc(dev, sizeof(*pwr), GFP_KERNEL); 95 if (!pwr) 96 return -ENOMEM; 97 98 pwr->data = match->data; 99 100 idev = devm_input_allocate_device(dev); 101 if (!idev) 102 return -ENOMEM; 103 104 idev->name = pwr->data->name; 105 snprintf(pwr->phys, sizeof(pwr->phys), "%s/input0", 106 pwr->data->name); 107 idev->phys = pwr->phys; 108 idev->dev.parent = dev; 109 idev->id.bustype = BUS_I2C; 110 111 input_set_capability(idev, EV_KEY, KEY_POWER); 112 113 pwr->regmap = dev_get_regmap(dev->parent, NULL); 114 pwr->dev = dev; 115 pwr->idev = idev; 116 device_init_wakeup(dev, true); 117 118 irq = platform_get_irq(pdev, 0); 119 if (irq < 0) 120 return -EINVAL; 121 122 error = devm_request_threaded_irq(dev, irq, NULL, tps6521x_pb_irq, 123 IRQF_TRIGGER_RISING | 124 IRQF_TRIGGER_FALLING | 125 IRQF_ONESHOT, 126 pwr->data->name, pwr); 127 if (error) { 128 dev_err(dev, "failed to request IRQ #%d: %d\n", irq, error); 129 return error; 130 } 131 132 error= input_register_device(idev); 133 if (error) { 134 dev_err(dev, "Can't register power button: %d\n", error); 135 return error; 136 } 137 138 return 0; 139 } 140 141 static const struct platform_device_id tps6521x_pwrbtn_id_table[] = { 142 { "tps65218-pwrbutton", }, 143 { "tps65217-pwrbutton", }, 144 { /* sentinel */ } 145 }; 146 MODULE_DEVICE_TABLE(platform, tps6521x_pwrbtn_id_table); 147 148 static struct platform_driver tps6521x_pb_driver = { 149 .probe = tps6521x_pb_probe, 150 .driver = { 151 .name = "tps6521x_pwrbutton", 152 .of_match_table = of_tps6521x_pb_match, 153 }, 154 .id_table = tps6521x_pwrbtn_id_table, 155 }; 156 module_platform_driver(tps6521x_pb_driver); 157 158 MODULE_DESCRIPTION("TPS6521X Power Button"); 159 MODULE_LICENSE("GPL v2"); 160 MODULE_AUTHOR("Felipe Balbi <balbi@ti.com>"); 161