mirror of https://gitee.com/openkylin/linux.git
164 lines
3.9 KiB
C
164 lines
3.9 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
|
|
/**
|
|
* extcon-qcom-spmi-misc.c - Qualcomm USB extcon driver to support USB ID
|
|
* detection based on extcon-usb-gpio.c.
|
|
*
|
|
* Copyright (C) 2016 Linaro, Ltd.
|
|
* Stephen Boyd <stephen.boyd@linaro.org>
|
|
*/
|
|
|
|
#include <linux/extcon-provider.h>
|
|
#include <linux/init.h>
|
|
#include <linux/interrupt.h>
|
|
#include <linux/kernel.h>
|
|
#include <linux/module.h>
|
|
#include <linux/mod_devicetable.h>
|
|
#include <linux/platform_device.h>
|
|
#include <linux/slab.h>
|
|
#include <linux/workqueue.h>
|
|
|
|
#define USB_ID_DEBOUNCE_MS 5 /* ms */
|
|
|
|
struct qcom_usb_extcon_info {
|
|
struct extcon_dev *edev;
|
|
int irq;
|
|
struct delayed_work wq_detcable;
|
|
unsigned long debounce_jiffies;
|
|
};
|
|
|
|
static const unsigned int qcom_usb_extcon_cable[] = {
|
|
EXTCON_USB_HOST,
|
|
EXTCON_NONE,
|
|
};
|
|
|
|
static void qcom_usb_extcon_detect_cable(struct work_struct *work)
|
|
{
|
|
bool id;
|
|
int ret;
|
|
struct qcom_usb_extcon_info *info = container_of(to_delayed_work(work),
|
|
struct qcom_usb_extcon_info,
|
|
wq_detcable);
|
|
|
|
/* check ID and update cable state */
|
|
ret = irq_get_irqchip_state(info->irq, IRQCHIP_STATE_LINE_LEVEL, &id);
|
|
if (ret)
|
|
return;
|
|
|
|
extcon_set_state_sync(info->edev, EXTCON_USB_HOST, !id);
|
|
}
|
|
|
|
static irqreturn_t qcom_usb_irq_handler(int irq, void *dev_id)
|
|
{
|
|
struct qcom_usb_extcon_info *info = dev_id;
|
|
|
|
queue_delayed_work(system_power_efficient_wq, &info->wq_detcable,
|
|
info->debounce_jiffies);
|
|
|
|
return IRQ_HANDLED;
|
|
}
|
|
|
|
static int qcom_usb_extcon_probe(struct platform_device *pdev)
|
|
{
|
|
struct device *dev = &pdev->dev;
|
|
struct qcom_usb_extcon_info *info;
|
|
int ret;
|
|
|
|
info = devm_kzalloc(dev, sizeof(*info), GFP_KERNEL);
|
|
if (!info)
|
|
return -ENOMEM;
|
|
|
|
info->edev = devm_extcon_dev_allocate(dev, qcom_usb_extcon_cable);
|
|
if (IS_ERR(info->edev)) {
|
|
dev_err(dev, "failed to allocate extcon device\n");
|
|
return -ENOMEM;
|
|
}
|
|
|
|
ret = devm_extcon_dev_register(dev, info->edev);
|
|
if (ret < 0) {
|
|
dev_err(dev, "failed to register extcon device\n");
|
|
return ret;
|
|
}
|
|
|
|
info->debounce_jiffies = msecs_to_jiffies(USB_ID_DEBOUNCE_MS);
|
|
INIT_DELAYED_WORK(&info->wq_detcable, qcom_usb_extcon_detect_cable);
|
|
|
|
info->irq = platform_get_irq_byname(pdev, "usb_id");
|
|
if (info->irq < 0)
|
|
return info->irq;
|
|
|
|
ret = devm_request_threaded_irq(dev, info->irq, NULL,
|
|
qcom_usb_irq_handler,
|
|
IRQF_TRIGGER_RISING |
|
|
IRQF_TRIGGER_FALLING | IRQF_ONESHOT,
|
|
pdev->name, info);
|
|
if (ret < 0) {
|
|
dev_err(dev, "failed to request handler for ID IRQ\n");
|
|
return ret;
|
|
}
|
|
|
|
platform_set_drvdata(pdev, info);
|
|
device_init_wakeup(dev, 1);
|
|
|
|
/* Perform initial detection */
|
|
qcom_usb_extcon_detect_cable(&info->wq_detcable.work);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int qcom_usb_extcon_remove(struct platform_device *pdev)
|
|
{
|
|
struct qcom_usb_extcon_info *info = platform_get_drvdata(pdev);
|
|
|
|
cancel_delayed_work_sync(&info->wq_detcable);
|
|
|
|
return 0;
|
|
}
|
|
|
|
#ifdef CONFIG_PM_SLEEP
|
|
static int qcom_usb_extcon_suspend(struct device *dev)
|
|
{
|
|
struct qcom_usb_extcon_info *info = dev_get_drvdata(dev);
|
|
int ret = 0;
|
|
|
|
if (device_may_wakeup(dev))
|
|
ret = enable_irq_wake(info->irq);
|
|
|
|
return ret;
|
|
}
|
|
|
|
static int qcom_usb_extcon_resume(struct device *dev)
|
|
{
|
|
struct qcom_usb_extcon_info *info = dev_get_drvdata(dev);
|
|
int ret = 0;
|
|
|
|
if (device_may_wakeup(dev))
|
|
ret = disable_irq_wake(info->irq);
|
|
|
|
return ret;
|
|
}
|
|
#endif
|
|
|
|
static SIMPLE_DEV_PM_OPS(qcom_usb_extcon_pm_ops,
|
|
qcom_usb_extcon_suspend, qcom_usb_extcon_resume);
|
|
|
|
static const struct of_device_id qcom_usb_extcon_dt_match[] = {
|
|
{ .compatible = "qcom,pm8941-misc", },
|
|
{ }
|
|
};
|
|
MODULE_DEVICE_TABLE(of, qcom_usb_extcon_dt_match);
|
|
|
|
static struct platform_driver qcom_usb_extcon_driver = {
|
|
.probe = qcom_usb_extcon_probe,
|
|
.remove = qcom_usb_extcon_remove,
|
|
.driver = {
|
|
.name = "extcon-pm8941-misc",
|
|
.pm = &qcom_usb_extcon_pm_ops,
|
|
.of_match_table = qcom_usb_extcon_dt_match,
|
|
},
|
|
};
|
|
module_platform_driver(qcom_usb_extcon_driver);
|
|
|
|
MODULE_DESCRIPTION("QCOM USB ID extcon driver");
|
|
MODULE_AUTHOR("Stephen Boyd <stephen.boyd@linaro.org>");
|
|
MODULE_LICENSE("GPL v2");
|