// SPDX-License-Identifier: GPL-2.0-only/* * Maxim Integrated MAX3355 USB OTG chip extcon driver * * Copyright (C)  2014-2015 Cogent Embedded, Inc. * Author: Sergei Shtylyov <sergei.shtylyov@cogentembedded.com> */ #include <linux/extcon-provider.h>#include <linux/gpio/consumer.h>#include <linux/interrupt.h>#include <linux/module.h>#include <linux/platform_device.h> struct max3355_data {	struct extcon_dev *edev;	struct gpio_desc *id_gpiod;	struct gpio_desc *shdn_gpiod;}; static const unsigned int max3355_cable[] = {	EXTCON_USB,	EXTCON_USB_HOST,	EXTCON_NONE,}; static irqreturn_t max3355_id_irq(int irq, void *dev_id){	struct max3355_data *data = dev_id;	int id = gpiod_get_value_cansleep(data->id_gpiod); 	if (id) {		/*		 * ID = 1 means USB HOST cable detached.		 * As we don't have event for USB peripheral cable attached,		 * we simulate USB peripheral attach here.		 */		extcon_set_state_sync(data->edev, EXTCON_USB_HOST, false);		extcon_set_state_sync(data->edev, EXTCON_USB, true);	} else {		/*		 * ID = 0 means USB HOST cable attached.		 * As we don't have event for USB peripheral cable detached,		 * we simulate USB peripheral detach here.		 */		extcon_set_state_sync(data->edev, EXTCON_USB, false);		extcon_set_state_sync(data->edev, EXTCON_USB_HOST, true);	} 	return IRQ_HANDLED;} static int max3355_probe(struct platform_device *pdev){	struct max3355_data *data;	struct gpio_desc *gpiod;	int irq, err; 	data = devm_kzalloc(&pdev->dev, sizeof(struct max3355_data),			    GFP_KERNEL);	if (!data)		return -ENOMEM; 	gpiod = devm_gpiod_get(&pdev->dev, "id", GPIOD_IN);	if (IS_ERR(gpiod)) {		dev_err(&pdev->dev, "failed to get ID_OUT GPIO\n");		return PTR_ERR(gpiod);	}	data->id_gpiod = gpiod; 	gpiod = devm_gpiod_get(&pdev->dev, "maxim,shdn", GPIOD_OUT_HIGH);	if (IS_ERR(gpiod)) {		dev_err(&pdev->dev, "failed to get SHDN# GPIO\n");		return PTR_ERR(gpiod);	}	data->shdn_gpiod = gpiod; 	data->edev = devm_extcon_dev_allocate(&pdev->dev, max3355_cable);	if (IS_ERR(data->edev)) {		dev_err(&pdev->dev, "failed to allocate extcon device\n");		return PTR_ERR(data->edev);	} 	err = devm_extcon_dev_register(&pdev->dev, data->edev);	if (err < 0) {		dev_err(&pdev->dev, "failed to register extcon device\n");		return err;	} 	irq = gpiod_to_irq(data->id_gpiod);	if (irq < 0) {		dev_err(&pdev->dev, "failed to translate ID_OUT GPIO to IRQ\n");		return irq;	} 	err = devm_request_threaded_irq(&pdev->dev, irq, NULL, max3355_id_irq,					IRQF_ONESHOT | IRQF_NO_SUSPEND |					IRQF_TRIGGER_RISING |					IRQF_TRIGGER_FALLING,					pdev->name, data);	if (err < 0) {		dev_err(&pdev->dev, "failed to request ID_OUT IRQ\n");		return err;	} 	platform_set_drvdata(pdev, data); 	/* Perform initial detection */	max3355_id_irq(irq, data); 	return 0;} static void max3355_remove(struct platform_device *pdev){	struct max3355_data *data = platform_get_drvdata(pdev); 	gpiod_set_value_cansleep(data->shdn_gpiod, 0);} static const struct of_device_id max3355_match_table[] = {	{ .compatible = "maxim,max3355", },	{ }};MODULE_DEVICE_TABLE(of, max3355_match_table); static struct platform_driver max3355_driver = {	.probe		= max3355_probe,	.remove		= max3355_remove,	.driver		= {		.name	= "extcon-max3355",		.of_match_table = max3355_match_table,	},}; module_platform_driver(max3355_driver); MODULE_AUTHOR("Sergei Shtylyov <sergei.shtylyov@cogentembedded.com>");MODULE_DESCRIPTION("Maxim MAX3355 extcon driver");MODULE_LICENSE("GPL v2");