![Chanwoo Choi](/assets/img/avatar_default.png)
This patch fixes the checkpatch warning about coding style. Signed-off-by: Chanwoo Choi <cw00.choi@samsung.com>
238 lines
5.7 KiB
C
238 lines
5.7 KiB
C
/**
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* drivers/extcon/extcon-usb-gpio.c - USB GPIO extcon driver
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*
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* Copyright (C) 2015 Texas Instruments Incorporated - http://www.ti.com
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* Author: Roger Quadros <rogerq@ti.com>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*/
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#include <linux/extcon.h>
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#include <linux/init.h>
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#include <linux/interrupt.h>
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#include <linux/irq.h>
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#include <linux/kernel.h>
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#include <linux/module.h>
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#include <linux/of_gpio.h>
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#include <linux/platform_device.h>
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#include <linux/slab.h>
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#include <linux/workqueue.h>
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#define USB_GPIO_DEBOUNCE_MS 20 /* ms */
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struct usb_extcon_info {
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struct device *dev;
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struct extcon_dev *edev;
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struct gpio_desc *id_gpiod;
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int id_irq;
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unsigned long debounce_jiffies;
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struct delayed_work wq_detcable;
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};
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/* List of detectable cables */
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enum {
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EXTCON_CABLE_USB = 0,
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EXTCON_CABLE_USB_HOST,
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EXTCON_CABLE_END,
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};
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static const char *usb_extcon_cable[] = {
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[EXTCON_CABLE_USB] = "USB",
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[EXTCON_CABLE_USB_HOST] = "USB-HOST",
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NULL,
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};
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static void usb_extcon_detect_cable(struct work_struct *work)
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{
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int id;
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struct usb_extcon_info *info = container_of(to_delayed_work(work),
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struct usb_extcon_info,
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wq_detcable);
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/* check ID and update cable state */
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id = gpiod_get_value_cansleep(info->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_cable_state(info->edev,
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usb_extcon_cable[EXTCON_CABLE_USB_HOST],
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false);
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extcon_set_cable_state(info->edev,
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usb_extcon_cable[EXTCON_CABLE_USB],
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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_cable_state(info->edev,
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usb_extcon_cable[EXTCON_CABLE_USB],
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false);
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extcon_set_cable_state(info->edev,
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usb_extcon_cable[EXTCON_CABLE_USB_HOST],
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true);
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}
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}
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static irqreturn_t usb_irq_handler(int irq, void *dev_id)
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{
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struct usb_extcon_info *info = dev_id;
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queue_delayed_work(system_power_efficient_wq, &info->wq_detcable,
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info->debounce_jiffies);
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return IRQ_HANDLED;
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}
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static int usb_extcon_probe(struct platform_device *pdev)
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{
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struct device *dev = &pdev->dev;
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struct device_node *np = dev->of_node;
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struct usb_extcon_info *info;
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int ret;
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if (!np)
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return -EINVAL;
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info = devm_kzalloc(&pdev->dev, sizeof(*info), GFP_KERNEL);
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if (!info)
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return -ENOMEM;
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info->dev = dev;
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info->id_gpiod = devm_gpiod_get(&pdev->dev, "id");
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if (IS_ERR(info->id_gpiod)) {
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dev_err(dev, "failed to get ID GPIO\n");
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return PTR_ERR(info->id_gpiod);
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}
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ret = gpiod_set_debounce(info->id_gpiod,
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USB_GPIO_DEBOUNCE_MS * 1000);
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if (ret < 0)
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info->debounce_jiffies = msecs_to_jiffies(USB_GPIO_DEBOUNCE_MS);
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INIT_DELAYED_WORK(&info->wq_detcable, usb_extcon_detect_cable);
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info->id_irq = gpiod_to_irq(info->id_gpiod);
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if (info->id_irq < 0) {
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dev_err(dev, "failed to get ID IRQ\n");
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return info->id_irq;
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}
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ret = devm_request_threaded_irq(dev, info->id_irq, NULL,
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usb_irq_handler,
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IRQF_TRIGGER_RISING |
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IRQF_TRIGGER_FALLING | IRQF_ONESHOT,
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pdev->name, info);
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if (ret < 0) {
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dev_err(dev, "failed to request handler for ID IRQ\n");
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return ret;
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}
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info->edev = devm_extcon_dev_allocate(dev, usb_extcon_cable);
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if (IS_ERR(info->edev)) {
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dev_err(dev, "failed to allocate extcon device\n");
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return -ENOMEM;
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}
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ret = devm_extcon_dev_register(dev, info->edev);
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if (ret < 0) {
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dev_err(dev, "failed to register extcon device\n");
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return ret;
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}
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platform_set_drvdata(pdev, info);
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device_init_wakeup(dev, 1);
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/* Perform initial detection */
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usb_extcon_detect_cable(&info->wq_detcable.work);
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return 0;
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}
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static int usb_extcon_remove(struct platform_device *pdev)
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{
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struct usb_extcon_info *info = platform_get_drvdata(pdev);
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cancel_delayed_work_sync(&info->wq_detcable);
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return 0;
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}
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#ifdef CONFIG_PM_SLEEP
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static int usb_extcon_suspend(struct device *dev)
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{
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struct usb_extcon_info *info = dev_get_drvdata(dev);
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int ret = 0;
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if (device_may_wakeup(dev)) {
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ret = enable_irq_wake(info->id_irq);
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if (ret)
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return ret;
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}
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/*
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* We don't want to process any IRQs after this point
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* as GPIOs used behind I2C subsystem might not be
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* accessible until resume completes. So disable IRQ.
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*/
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disable_irq(info->id_irq);
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return ret;
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}
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static int usb_extcon_resume(struct device *dev)
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{
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struct usb_extcon_info *info = dev_get_drvdata(dev);
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int ret = 0;
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if (device_may_wakeup(dev)) {
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ret = disable_irq_wake(info->id_irq);
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if (ret)
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return ret;
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}
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enable_irq(info->id_irq);
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return ret;
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}
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#endif
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static SIMPLE_DEV_PM_OPS(usb_extcon_pm_ops,
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usb_extcon_suspend, usb_extcon_resume);
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static const struct of_device_id usb_extcon_dt_match[] = {
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{ .compatible = "linux,extcon-usb-gpio", },
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{ /* sentinel */ }
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};
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MODULE_DEVICE_TABLE(of, usb_extcon_dt_match);
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static struct platform_driver usb_extcon_driver = {
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.probe = usb_extcon_probe,
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.remove = usb_extcon_remove,
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.driver = {
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.name = "extcon-usb-gpio",
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.pm = &usb_extcon_pm_ops,
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.of_match_table = usb_extcon_dt_match,
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},
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};
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module_platform_driver(usb_extcon_driver);
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MODULE_AUTHOR("Roger Quadros <rogerq@ti.com>");
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MODULE_DESCRIPTION("USB GPIO extcon driver");
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MODULE_LICENSE("GPL v2");
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