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Release 4.14 drivers/extcon/extcon-max3355.c

Directory: drivers/extcon
/*
 * Maxim Integrated MAX3355 USB OTG chip extcon driver
 *
 * Copyright (C)  2014-2015 Cogent Embedded, Inc.
 * Author: Sergei Shtylyov <sergei.shtylyov@cogentembedded.com>
 *
 * This software is licensed under the terms of the GNU General Public
 * License version 2, as published by the Free Software Foundation, and
 * may be copied, distributed, and modified under those terms.
 */

#include <linux/extcon.h>
#include <linux/gpio.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; }

Contributors

PersonTokensPropCommitsCommitProp
Sergei Shtylyov8495.45%150.00%
Chanwoo Choi44.55%150.00%
Total88100.00%2100.00%


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; }

Contributors

PersonTokensPropCommitsCommitProp
Sergei Shtylyov320100.00%1100.00%
Total320100.00%1100.00%


static int max3355_remove(struct platform_device *pdev) { struct max3355_data *data = platform_get_drvdata(pdev); gpiod_set_value_cansleep(data->shdn_gpiod, 0); return 0; }

Contributors

PersonTokensPropCommitsCommitProp
Sergei Shtylyov33100.00%1100.00%
Total33100.00%1100.00%

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");

Overall Contributors

PersonTokensPropCommitsCommitProp
Sergei Shtylyov56899.30%150.00%
Chanwoo Choi40.70%150.00%
Total572100.00%2100.00%
Directory: drivers/extcon
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