// 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 int 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); return 0; } static struct platform_driver da9052_onkey_driver = { .probe = da9052_onkey_probe, .remove = 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");