// 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_obj(*onkey);	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	= 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");