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ba6985eac3
The .remove() callback for a platform driver returns an int which makes many driver authors wrongly assume it's possible to do error handling by returning an error code. However the value returned is ignored (apart from emitting a warning) and this typically results in resource leaks. To improve here there is a quest to make the remove callback return void. In the first step of this quest all drivers are converted to .remove_new(), which already returns void. Eventually after all drivers are converted, .remove_new() will be renamed to .remove(). Trivially convert this driver from always returning zero in the remove callback to the void returning variant. Link: https://lore.kernel.org/lkml/2c017ea490f721646bd472e7d427eb377e4e8423.1708876186.git.u.kleine-koenig@pengutronix.de/ Signed-off-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de> Signed-off-by: Chanwoo Choi <cw00.choi@samsung.com>
142 lines
3.5 KiB
C
142 lines
3.5 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
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/*
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* Maxim Integrated MAX3355 USB OTG chip extcon driver
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*
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* Copyright (C) 2014-2015 Cogent Embedded, Inc.
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* Author: Sergei Shtylyov <sergei.shtylyov@cogentembedded.com>
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*/
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#include <linux/extcon-provider.h>
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#include <linux/gpio/consumer.h>
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#include <linux/interrupt.h>
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#include <linux/module.h>
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#include <linux/mod_devicetable.h>
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#include <linux/platform_device.h>
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struct max3355_data {
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struct extcon_dev *edev;
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struct gpio_desc *id_gpiod;
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struct gpio_desc *shdn_gpiod;
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};
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static const unsigned int max3355_cable[] = {
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EXTCON_USB,
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EXTCON_USB_HOST,
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EXTCON_NONE,
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};
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static irqreturn_t max3355_id_irq(int irq, void *dev_id)
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{
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struct max3355_data *data = dev_id;
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int id = gpiod_get_value_cansleep(data->id_gpiod);
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if (id) {
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/*
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* ID = 1 means USB HOST cable detached.
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* As we don't have event for USB peripheral cable attached,
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* we simulate USB peripheral attach here.
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*/
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extcon_set_state_sync(data->edev, EXTCON_USB_HOST, false);
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extcon_set_state_sync(data->edev, EXTCON_USB, true);
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} else {
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/*
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* ID = 0 means USB HOST cable attached.
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* As we don't have event for USB peripheral cable detached,
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* we simulate USB peripheral detach here.
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*/
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extcon_set_state_sync(data->edev, EXTCON_USB, false);
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extcon_set_state_sync(data->edev, EXTCON_USB_HOST, true);
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}
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return IRQ_HANDLED;
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}
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static int max3355_probe(struct platform_device *pdev)
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{
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struct max3355_data *data;
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struct gpio_desc *gpiod;
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int irq, err;
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data = devm_kzalloc(&pdev->dev, sizeof(struct max3355_data),
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GFP_KERNEL);
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if (!data)
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return -ENOMEM;
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gpiod = devm_gpiod_get(&pdev->dev, "id", GPIOD_IN);
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if (IS_ERR(gpiod)) {
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dev_err(&pdev->dev, "failed to get ID_OUT GPIO\n");
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return PTR_ERR(gpiod);
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}
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data->id_gpiod = gpiod;
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gpiod = devm_gpiod_get(&pdev->dev, "maxim,shdn", GPIOD_OUT_HIGH);
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if (IS_ERR(gpiod)) {
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dev_err(&pdev->dev, "failed to get SHDN# GPIO\n");
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return PTR_ERR(gpiod);
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}
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data->shdn_gpiod = gpiod;
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data->edev = devm_extcon_dev_allocate(&pdev->dev, max3355_cable);
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if (IS_ERR(data->edev)) {
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dev_err(&pdev->dev, "failed to allocate extcon device\n");
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return PTR_ERR(data->edev);
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}
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err = devm_extcon_dev_register(&pdev->dev, data->edev);
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if (err < 0) {
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dev_err(&pdev->dev, "failed to register extcon device\n");
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return err;
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}
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irq = gpiod_to_irq(data->id_gpiod);
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if (irq < 0) {
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dev_err(&pdev->dev, "failed to translate ID_OUT GPIO to IRQ\n");
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return irq;
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}
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err = devm_request_threaded_irq(&pdev->dev, irq, NULL, max3355_id_irq,
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IRQF_ONESHOT | IRQF_NO_SUSPEND |
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IRQF_TRIGGER_RISING |
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IRQF_TRIGGER_FALLING,
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pdev->name, data);
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if (err < 0) {
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dev_err(&pdev->dev, "failed to request ID_OUT IRQ\n");
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return err;
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}
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platform_set_drvdata(pdev, data);
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/* Perform initial detection */
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max3355_id_irq(irq, data);
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return 0;
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}
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static void max3355_remove(struct platform_device *pdev)
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{
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struct max3355_data *data = platform_get_drvdata(pdev);
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gpiod_set_value_cansleep(data->shdn_gpiod, 0);
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}
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static const struct of_device_id max3355_match_table[] = {
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{ .compatible = "maxim,max3355", },
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{ }
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};
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MODULE_DEVICE_TABLE(of, max3355_match_table);
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static struct platform_driver max3355_driver = {
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.probe = max3355_probe,
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.remove_new = max3355_remove,
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.driver = {
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.name = "extcon-max3355",
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.of_match_table = max3355_match_table,
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},
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};
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module_platform_driver(max3355_driver);
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MODULE_AUTHOR("Sergei Shtylyov <sergei.shtylyov@cogentembedded.com>");
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MODULE_DESCRIPTION("Maxim MAX3355 extcon driver");
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MODULE_LICENSE("GPL v2");
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