Commit 38085c98 authored by Stephen Boyd's avatar Stephen Boyd Committed by Chanwoo Choi
Browse files

extcon: Add support for qcom SPMI PMIC USB id detection hardware 



Some Qualcomm PMICs have a misc device that performs USB id pin
detection via an interrupt. When the interrupt triggers, we
should read the interrupt line to see if it has gone high or low.
If the interrupt is low then the ID pin is grounded, and if the
interrupt is high then the ID pin is being held high.

Cc: Roger Quadros <rogerq@ti.com>
Signed-off-by: default avatarStephen Boyd <stephen.boyd@linaro.org>
[cw00.choi: Edited the driver description and added the author information]
Signed-off-by: default avatarChanwoo Choi <cw00.choi@samsung.com>
parent 8670b459

Documentation/devicetree/bindings/extcon/qcom,pm8941-misc.txt

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Qualcomm's PM8941 USB ID Extcon device



Some Qualcomm PMICs have a "misc" module that can be used to detect when

the USB ID pin has been pulled low or high.



PROPERTIES



- compatible:

    Usage: required

    Value type: <string>

    Definition: Should contain "qcom,pm8941-misc";



- reg:

    Usage: required

    Value type: <u32>

    Definition: Should contain the offset to the misc address space



- interrupts:

    Usage: required

    Value type: <prop-encoded-array>

    Definition: Should contain the usb id interrupt



- interrupt-names:

    Usage: required

    Value type: <stringlist>

    Definition: Should contain the string "usb_id" for the usb id interrupt



Example:



	pmic {

		usb_id: misc@900 {

			compatible = "qcom,pm8941-misc";

			reg = <0x900>;

			interrupts = <0x0 0x9 0 IRQ_TYPE_EDGE_BOTH>;

			interrupt-names = "usb_id";

		};

	}



	usb-controller {

		extcon = <&usb_id>;

	};

drivers/extcon/Kconfig

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@@ -96,6 +96,12 @@ config EXTCON_PALMAS 
	  Say Y here to enable support for USB peripheral and USB host

	  detection by palmas usb.



config EXTCON_QCOM_SPMI_MISC

	tristate "Qualcomm USB extcon support"

	help

	  Say Y here to enable SPMI PMIC based USB cable detection

	  support on Qualcomm PMICs such as PM8941.



config EXTCON_RT8973A

	tristate "Richtek RT8973A EXTCON support"

	depends on I2C

drivers/extcon/Makefile

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@@ -14,6 +14,7 @@ obj-$(CONFIG_EXTCON_MAX77693) += extcon-max77693.o 
obj-$(CONFIG_EXTCON_MAX77843)	+= extcon-max77843.o

obj-$(CONFIG_EXTCON_MAX8997)	+= extcon-max8997.o

obj-$(CONFIG_EXTCON_PALMAS)	+= extcon-palmas.o

obj-$(CONFIG_EXTCON_QCOM_SPMI_MISC) += extcon-qcom-spmi-misc.o

obj-$(CONFIG_EXTCON_RT8973A)	+= extcon-rt8973a.o

obj-$(CONFIG_EXTCON_SM5502)	+= extcon-sm5502.o

obj-$(CONFIG_EXTCON_USB_GPIO)	+= extcon-usb-gpio.o

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

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/**

 * 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(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");

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