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1802d0beec
Based on 1 normalized pattern(s): this program is free software you can redistribute it and or modify it under the terms of the gnu general public license version 2 as published by the free software foundation this program is distributed in the hope that it will be useful but without any warranty without even the implied warranty of merchantability or fitness for a particular purpose see the gnu general public license for more details extracted by the scancode license scanner the SPDX license identifier GPL-2.0-only has been chosen to replace the boilerplate/reference in 655 file(s). Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Reviewed-by: Allison Randal <allison@lohutok.net> Reviewed-by: Kate Stewart <kstewart@linuxfoundation.org> Reviewed-by: Richard Fontana <rfontana@redhat.com> Cc: linux-spdx@vger.kernel.org Link: https://lkml.kernel.org/r/20190527070034.575739538@linutronix.de Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
314 lines
7.5 KiB
C
314 lines
7.5 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 - http://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.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/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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#include <linux/pinctrl/consumer.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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/*
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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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if (info->id_gpiod)
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disable_irq(info->id_irq);
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if (info->vbus_gpiod)
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disable_irq(info->vbus_irq);
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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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if (info->id_gpiod)
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enable_irq(info->id_irq);
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if (info->vbus_gpiod)
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enable_irq(info->vbus_irq);
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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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