1 // SPDX-License-Identifier: GPL-2.0-or-later 2 /* 3 * ON pin driver for Dialog DA9055 PMICs 4 * 5 * Copyright(c) 2012 Dialog Semiconductor Ltd. 6 * 7 * Author: David Dajun Chen <dchen@diasemi.com> 8 */ 9 10 #include <linux/input.h> 11 #include <linux/module.h> 12 #include <linux/platform_device.h> 13 14 #include <linux/mfd/da9055/core.h> 15 #include <linux/mfd/da9055/reg.h> 16 17 struct da9055_onkey { 18 struct da9055 *da9055; 19 struct input_dev *input; 20 struct delayed_work work; 21 }; 22 23 static void da9055_onkey_query(struct da9055_onkey *onkey) 24 { 25 int key_stat; 26 27 key_stat = da9055_reg_read(onkey->da9055, DA9055_REG_STATUS_A); 28 if (key_stat < 0) { 29 dev_err(onkey->da9055->dev, 30 "Failed to read onkey event %d\n", key_stat); 31 } else { 32 key_stat &= DA9055_NOKEY_STS; 33 /* 34 * Onkey status bit is cleared when onkey button is released. 35 */ 36 if (!key_stat) { 37 input_report_key(onkey->input, KEY_POWER, 0); 38 input_sync(onkey->input); 39 } 40 } 41 42 /* 43 * Interrupt is generated only when the ONKEY pin is asserted. 44 * Hence the deassertion of the pin is simulated through work queue. 45 */ 46 if (key_stat) 47 schedule_delayed_work(&onkey->work, msecs_to_jiffies(10)); 48 49 } 50 51 static void da9055_onkey_work(struct work_struct *work) 52 { 53 struct da9055_onkey *onkey = container_of(work, struct da9055_onkey, 54 work.work); 55 56 da9055_onkey_query(onkey); 57 } 58 59 static irqreturn_t da9055_onkey_irq(int irq, void *data) 60 { 61 struct da9055_onkey *onkey = data; 62 63 input_report_key(onkey->input, KEY_POWER, 1); 64 input_sync(onkey->input); 65 66 da9055_onkey_query(onkey); 67 68 return IRQ_HANDLED; 69 } 70 71 static int da9055_onkey_probe(struct platform_device *pdev) 72 { 73 struct da9055 *da9055 = dev_get_drvdata(pdev->dev.parent); 74 struct da9055_onkey *onkey; 75 struct input_dev *input_dev; 76 int irq, err; 77 78 irq = platform_get_irq_byname(pdev, "ONKEY"); 79 if (irq < 0) 80 return -EINVAL; 81 82 onkey = devm_kzalloc(&pdev->dev, sizeof(*onkey), GFP_KERNEL); 83 if (!onkey) { 84 dev_err(&pdev->dev, "Failed to allocate memory\n"); 85 return -ENOMEM; 86 } 87 88 input_dev = input_allocate_device(); 89 if (!input_dev) { 90 dev_err(&pdev->dev, "Failed to allocate memory\n"); 91 return -ENOMEM; 92 } 93 94 onkey->input = input_dev; 95 onkey->da9055 = da9055; 96 input_dev->name = "da9055-onkey"; 97 input_dev->phys = "da9055-onkey/input0"; 98 input_dev->dev.parent = &pdev->dev; 99 100 input_dev->evbit[0] = BIT_MASK(EV_KEY); 101 __set_bit(KEY_POWER, input_dev->keybit); 102 103 INIT_DELAYED_WORK(&onkey->work, da9055_onkey_work); 104 105 err = request_threaded_irq(irq, NULL, da9055_onkey_irq, 106 IRQF_TRIGGER_HIGH | IRQF_ONESHOT, 107 "ONKEY", onkey); 108 if (err < 0) { 109 dev_err(&pdev->dev, 110 "Failed to register ONKEY IRQ %d, error = %d\n", 111 irq, err); 112 goto err_free_input; 113 } 114 115 err = input_register_device(input_dev); 116 if (err) { 117 dev_err(&pdev->dev, "Unable to register input device, %d\n", 118 err); 119 goto err_free_irq; 120 } 121 122 platform_set_drvdata(pdev, onkey); 123 124 return 0; 125 126 err_free_irq: 127 free_irq(irq, onkey); 128 cancel_delayed_work_sync(&onkey->work); 129 err_free_input: 130 input_free_device(input_dev); 131 132 return err; 133 } 134 135 static int da9055_onkey_remove(struct platform_device *pdev) 136 { 137 struct da9055_onkey *onkey = platform_get_drvdata(pdev); 138 int irq = platform_get_irq_byname(pdev, "ONKEY"); 139 140 irq = regmap_irq_get_virq(onkey->da9055->irq_data, irq); 141 free_irq(irq, onkey); 142 cancel_delayed_work_sync(&onkey->work); 143 input_unregister_device(onkey->input); 144 145 return 0; 146 } 147 148 static struct platform_driver da9055_onkey_driver = { 149 .probe = da9055_onkey_probe, 150 .remove = da9055_onkey_remove, 151 .driver = { 152 .name = "da9055-onkey", 153 }, 154 }; 155 156 module_platform_driver(da9055_onkey_driver); 157 158 MODULE_AUTHOR("David Dajun Chen <dchen@diasemi.com>"); 159 MODULE_DESCRIPTION("Onkey driver for DA9055"); 160 MODULE_LICENSE("GPL"); 161 MODULE_ALIAS("platform:da9055-onkey"); 162