298 lines
7.1 KiB
C
298 lines
7.1 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
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/*
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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 - https://www.ti.com
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* Author: Roger Quadros <rogerq@ti.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/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/platform_device.h>
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#include <linux/slab.h>
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#include <linux/workqueue.h>
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#include <linux/pinctrl/consumer.h>
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#include <linux/mod_devicetable.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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struct gpio_desc *vbus_gpiod;
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int id_irq;
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int vbus_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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static const unsigned int usb_extcon_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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/*
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* "USB" = VBUS and "USB-HOST" = !ID, so we have:
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* Both "USB" and "USB-HOST" can't be set as active at the
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* same time so if "USB-HOST" is active (i.e. ID is 0) we keep "USB" inactive
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* even if VBUS is on.
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*
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* State | ID | VBUS
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* ----------------------------------------
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* [1] USB | H | H
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* [2] none | H | L
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* [3] USB-HOST | L | H
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* [4] USB-HOST | L | L
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*
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* In case we have only one of these signals:
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* - VBUS only - we want to distinguish between [1] and [2], so ID is always 1.
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* - ID only - we want to distinguish between [1] and [4], so VBUS = ID.
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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, vbus;
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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 VBUS and update cable state */
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id = info->id_gpiod ?
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gpiod_get_value_cansleep(info->id_gpiod) : 1;
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vbus = info->vbus_gpiod ?
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gpiod_get_value_cansleep(info->vbus_gpiod) : id;
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/* at first we clean states which are no longer active */
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if (id)
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extcon_set_state_sync(info->edev, EXTCON_USB_HOST, false);
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if (!vbus)
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extcon_set_state_sync(info->edev, EXTCON_USB, false);
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if (!id) {
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extcon_set_state_sync(info->edev, EXTCON_USB_HOST, true);
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} else {
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if (vbus)
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extcon_set_state_sync(info->edev, EXTCON_USB, 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_optional(&pdev->dev, "id", GPIOD_IN);
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info->vbus_gpiod = devm_gpiod_get_optional(&pdev->dev, "vbus",
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GPIOD_IN);
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if (!info->id_gpiod && !info->vbus_gpiod) {
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dev_err(dev, "failed to get gpios\n");
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return -ENODEV;
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}
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if (IS_ERR(info->id_gpiod))
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return PTR_ERR(info->id_gpiod);
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if (IS_ERR(info->vbus_gpiod))
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return PTR_ERR(info->vbus_gpiod);
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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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if (info->id_gpiod)
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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 && info->vbus_gpiod)
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ret = gpiod_set_debounce(info->vbus_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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if (info->id_gpiod) {
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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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}
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if (info->vbus_gpiod) {
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info->vbus_irq = gpiod_to_irq(info->vbus_gpiod);
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if (info->vbus_irq < 0) {
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dev_err(dev, "failed to get VBUS IRQ\n");
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return info->vbus_irq;
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}
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ret = devm_request_threaded_irq(dev, info->vbus_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 VBUS IRQ\n");
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return ret;
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}
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}
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platform_set_drvdata(pdev, info);
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device_set_wakeup_capable(&pdev->dev, true);
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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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device_init_wakeup(&pdev->dev, false);
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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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if (info->id_gpiod) {
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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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if (info->vbus_gpiod) {
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ret = enable_irq_wake(info->vbus_irq);
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if (ret) {
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if (info->id_gpiod)
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disable_irq_wake(info->id_irq);
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return ret;
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}
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}
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}
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if (!device_may_wakeup(dev))
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pinctrl_pm_select_sleep_state(dev);
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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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pinctrl_pm_select_default_state(dev);
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if (device_may_wakeup(dev)) {
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if (info->id_gpiod) {
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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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if (info->vbus_gpiod) {
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ret = disable_irq_wake(info->vbus_irq);
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if (ret) {
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if (info->id_gpiod)
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enable_irq_wake(info->id_irq);
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return ret;
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}
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}
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}
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queue_delayed_work(system_power_efficient_wq,
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&info->wq_detcable, 0);
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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 const struct platform_device_id usb_extcon_platform_ids[] = {
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{ .name = "extcon-usb-gpio", },
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{ /* sentinel */ }
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};
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MODULE_DEVICE_TABLE(platform, usb_extcon_platform_ids);
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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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.id_table = usb_extcon_platform_ids,
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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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