// SPDX-License-Identifier: GPL-2.0-only/* * Copyright (c) 2014, National Instruments Corp. All rights reserved. * * Driver for NI Ettus Research USRP E3x0 Button Driver */ #include <linux/device.h>#include <linux/kernel.h>#include <linux/module.h>#include <linux/platform_device.h>#include <linux/input.h>#include <linux/interrupt.h>#include <linux/of.h>#include <linux/slab.h> static irqreturn_t e3x0_button_release_handler(int irq, void *data){	struct input_dev *idev = data; 	input_report_key(idev, KEY_POWER, 0);	input_sync(idev); 	return IRQ_HANDLED;} static irqreturn_t e3x0_button_press_handler(int irq, void *data){	struct input_dev *idev = data; 	input_report_key(idev, KEY_POWER, 1);	pm_wakeup_event(idev->dev.parent, 0);	input_sync(idev); 	return IRQ_HANDLED;} static int e3x0_button_suspend(struct device *dev){	struct platform_device *pdev = to_platform_device(dev); 	if (device_may_wakeup(dev))		enable_irq_wake(platform_get_irq_byname(pdev, "press")); 	return 0;} static int e3x0_button_resume(struct device *dev){	struct platform_device *pdev = to_platform_device(dev); 	if (device_may_wakeup(dev))		disable_irq_wake(platform_get_irq_byname(pdev, "press")); 	return 0;} static DEFINE_SIMPLE_DEV_PM_OPS(e3x0_button_pm_ops,				e3x0_button_suspend, e3x0_button_resume); static int e3x0_button_probe(struct platform_device *pdev){	struct input_dev *input;	int irq_press, irq_release;	int error; 	irq_press = platform_get_irq_byname(pdev, "press");	if (irq_press < 0)		return irq_press; 	irq_release = platform_get_irq_byname(pdev, "release");	if (irq_release < 0)		return irq_release; 	input = devm_input_allocate_device(&pdev->dev);	if (!input)		return -ENOMEM; 	input->name = "NI Ettus Research USRP E3x0 Button Driver";	input->phys = "e3x0_button/input0";	input->dev.parent = &pdev->dev; 	input_set_capability(input, EV_KEY, KEY_POWER); 	error = devm_request_irq(&pdev->dev, irq_press,				 e3x0_button_press_handler, 0,				 "e3x0-button", input);	if (error) {		dev_err(&pdev->dev, "Failed to request 'press' IRQ#%d: %d\n",			irq_press, error);		return error;	} 	error = devm_request_irq(&pdev->dev, irq_release,				 e3x0_button_release_handler, 0,				 "e3x0-button", input);	if (error) {		dev_err(&pdev->dev, "Failed to request 'release' IRQ#%d: %d\n",			irq_release, error);		return error;	} 	error = input_register_device(input);	if (error) {		dev_err(&pdev->dev, "Can't register input device: %d\n", error);		return error;	} 	device_init_wakeup(&pdev->dev, 1);	return 0;} #ifdef CONFIG_OFstatic const struct of_device_id e3x0_button_match[] = {	{ .compatible = "ettus,e3x0-button", },	{ }};MODULE_DEVICE_TABLE(of, e3x0_button_match);#endif static struct platform_driver e3x0_button_driver = {	.driver		= {		.name	= "e3x0-button",		.of_match_table = of_match_ptr(e3x0_button_match),		.pm	= pm_sleep_ptr(&e3x0_button_pm_ops),	},	.probe		= e3x0_button_probe,}; module_platform_driver(e3x0_button_driver); MODULE_LICENSE("GPL v2");MODULE_AUTHOR("Moritz Fischer <moritz.fischer@ettus.com>");MODULE_DESCRIPTION("NI Ettus Research USRP E3x0 Button driver");MODULE_ALIAS("platform:e3x0-button");