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144 lines
3.5 KiB
144 lines
3.5 KiB
// 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 <[email protected]> |
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*/ |
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#include <linux/extcon-provider.h> |
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#include <linux/gpio.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 int 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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return 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 = 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 <[email protected]>"); |
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MODULE_DESCRIPTION("Maxim MAX3355 extcon driver"); |
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MODULE_LICENSE("GPL v2");
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