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Release 4.14 drivers/extcon/extcon-qcom-spmi-misc.c

Directory: drivers/extcon
/**
 * 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>
 *
 * 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.
 */

#include <linux/extcon.h>
#include <linux/init.h>
#include <linux/interrupt.h>
#include <linux/kernel.h>
#include <linux/module.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); }

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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; }

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Stephen Boyd37100.00%1100.00%
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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; }

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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; }

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Stephen Boyd32100.00%1100.00%
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#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; }

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Stephen Boyd45100.00%1100.00%
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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; }

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#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");

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Directory: drivers/extcon
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