171 lines
4.3 KiB
C
171 lines
4.3 KiB
C
/**
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* extcon-qcom-spmi-misc.c - Qualcomm USB extcon driver to support USB ID
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* detection based on extcon-usb-gpio.c.
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*
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* Copyright (C) 2016 Linaro, Ltd.
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* Stephen Boyd <stephen.boyd@linaro.org>
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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-provider.h>
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#include <linux/init.h>
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#include <linux/interrupt.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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#define USB_ID_DEBOUNCE_MS 5 /* ms */
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struct qcom_usb_extcon_info {
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struct extcon_dev *edev;
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int irq;
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struct delayed_work wq_detcable;
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unsigned long debounce_jiffies;
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};
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static const unsigned int qcom_usb_extcon_cable[] = {
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EXTCON_USB_HOST,
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EXTCON_NONE,
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};
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static void qcom_usb_extcon_detect_cable(struct work_struct *work)
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{
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bool id;
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int ret;
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struct qcom_usb_extcon_info *info = container_of(to_delayed_work(work),
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struct qcom_usb_extcon_info,
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wq_detcable);
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/* check ID and update cable state */
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ret = irq_get_irqchip_state(info->irq, IRQCHIP_STATE_LINE_LEVEL, &id);
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if (ret)
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return;
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extcon_set_state_sync(info->edev, EXTCON_USB_HOST, !id);
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}
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static irqreturn_t qcom_usb_irq_handler(int irq, void *dev_id)
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{
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struct qcom_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 qcom_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 qcom_usb_extcon_info *info;
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int ret;
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info = devm_kzalloc(dev, sizeof(*info), GFP_KERNEL);
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if (!info)
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return -ENOMEM;
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info->edev = devm_extcon_dev_allocate(dev, qcom_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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info->debounce_jiffies = msecs_to_jiffies(USB_ID_DEBOUNCE_MS);
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INIT_DELAYED_WORK(&info->wq_detcable, qcom_usb_extcon_detect_cable);
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info->irq = platform_get_irq_byname(pdev, "usb_id");
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if (info->irq < 0)
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return info->irq;
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ret = devm_request_threaded_irq(dev, info->irq, NULL,
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qcom_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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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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qcom_usb_extcon_detect_cable(&info->wq_detcable.work);
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return 0;
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}
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static int qcom_usb_extcon_remove(struct platform_device *pdev)
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{
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struct qcom_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 qcom_usb_extcon_suspend(struct device *dev)
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{
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struct qcom_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->irq);
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return ret;
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}
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static int qcom_usb_extcon_resume(struct device *dev)
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{
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struct qcom_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->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(qcom_usb_extcon_pm_ops,
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qcom_usb_extcon_suspend, qcom_usb_extcon_resume);
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static const struct of_device_id qcom_usb_extcon_dt_match[] = {
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{ .compatible = "qcom,pm8941-misc", },
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{ }
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};
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MODULE_DEVICE_TABLE(of, qcom_usb_extcon_dt_match);
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static struct platform_driver qcom_usb_extcon_driver = {
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.probe = qcom_usb_extcon_probe,
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.remove = qcom_usb_extcon_remove,
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.driver = {
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.name = "extcon-pm8941-misc",
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.pm = &qcom_usb_extcon_pm_ops,
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.of_match_table = qcom_usb_extcon_dt_match,
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},
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};
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module_platform_driver(qcom_usb_extcon_driver);
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MODULE_DESCRIPTION("QCOM USB ID extcon driver");
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MODULE_AUTHOR("Stephen Boyd <stephen.boyd@linaro.org>");
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MODULE_LICENSE("GPL v2");
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