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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 | // SPDX-License-Identifier: GPL-2.0-or-later /* * ON pin driver for Dialog DA9052 PMICs * * Copyright(c) 2012 Dialog Semiconductor Ltd. * * Author: David Dajun Chen <dchen@diasemi.com> */ #include <linux/input.h> #include <linux/module.h> #include <linux/platform_device.h> #include <linux/workqueue.h> #include <linux/mfd/da9052/da9052.h> #include <linux/mfd/da9052/reg.h> struct da9052_onkey { struct da9052 *da9052; struct input_dev *input; struct delayed_work work; }; static void da9052_onkey_query(struct da9052_onkey *onkey) { int ret; ret = da9052_reg_read(onkey->da9052, DA9052_STATUS_A_REG); if (ret < 0) { dev_err(onkey->da9052->dev, "Failed to read onkey event err=%d\n", ret); } else { /* * Since interrupt for deassertion of ONKEY pin is not * generated, onkey event state determines the onkey * button state. */ bool pressed = !(ret & DA9052_STATUSA_NONKEY); input_report_key(onkey->input, KEY_POWER, pressed); input_sync(onkey->input); /* * Interrupt is generated only when the ONKEY pin * is asserted. Hence the deassertion of the pin * is simulated through work queue. */ if (pressed) schedule_delayed_work(&onkey->work, msecs_to_jiffies(50)); } } static void da9052_onkey_work(struct work_struct *work) { struct da9052_onkey *onkey = container_of(work, struct da9052_onkey, work.work); da9052_onkey_query(onkey); } static irqreturn_t da9052_onkey_irq(int irq, void *data) { struct da9052_onkey *onkey = data; da9052_onkey_query(onkey); return IRQ_HANDLED; } static int da9052_onkey_probe(struct platform_device *pdev) { struct da9052 *da9052 = dev_get_drvdata(pdev->dev.parent); struct da9052_onkey *onkey; struct input_dev *input_dev; int error; if (!da9052) { dev_err(&pdev->dev, "Failed to get the driver's data\n"); return -EINVAL; } onkey = kzalloc(sizeof(*onkey), GFP_KERNEL); input_dev = input_allocate_device(); if (!onkey || !input_dev) { dev_err(&pdev->dev, "Failed to allocate memory\n"); error = -ENOMEM; goto err_free_mem; } onkey->input = input_dev; onkey->da9052 = da9052; INIT_DELAYED_WORK(&onkey->work, da9052_onkey_work); input_dev->name = "da9052-onkey"; input_dev->phys = "da9052-onkey/input0"; input_dev->dev.parent = &pdev->dev; input_dev->evbit[0] = BIT_MASK(EV_KEY); __set_bit(KEY_POWER, input_dev->keybit); error = da9052_request_irq(onkey->da9052, DA9052_IRQ_NONKEY, "ONKEY", da9052_onkey_irq, onkey); if (error < 0) { dev_err(onkey->da9052->dev, "Failed to register ONKEY IRQ: %d\n", error); goto err_free_mem; } error = input_register_device(onkey->input); if (error) { dev_err(&pdev->dev, "Unable to register input device, %d\n", error); goto err_free_irq; } platform_set_drvdata(pdev, onkey); return 0; err_free_irq: da9052_free_irq(onkey->da9052, DA9052_IRQ_NONKEY, onkey); cancel_delayed_work_sync(&onkey->work); err_free_mem: input_free_device(input_dev); kfree(onkey); return error; } static void da9052_onkey_remove(struct platform_device *pdev) { struct da9052_onkey *onkey = platform_get_drvdata(pdev); da9052_free_irq(onkey->da9052, DA9052_IRQ_NONKEY, onkey); cancel_delayed_work_sync(&onkey->work); input_unregister_device(onkey->input); kfree(onkey); } static struct platform_driver da9052_onkey_driver = { .probe = da9052_onkey_probe, .remove_new = da9052_onkey_remove, .driver = { .name = "da9052-onkey", }, }; module_platform_driver(da9052_onkey_driver); MODULE_AUTHOR("David Dajun Chen <dchen@diasemi.com>"); MODULE_DESCRIPTION("Onkey driver for DA9052"); MODULE_LICENSE("GPL"); MODULE_ALIAS("platform:da9052-onkey"); |