drivers/extcon/extcon-palmas.c - kernel/quantenna - Git at Google

 /*
  * Palmas USB transceiver driver
  *
  * Copyright (C) 2013 Texas Instruments Incorporated - http://www.ti.com
  * This program is free software; you can redistribute it and/or modify
  * it under the terms of the GNU General Public License as published by
  * the Free Software Foundation; either version 2 of the License, or
  * (at your option) any later version.
  *
  * Author: Graeme Gregory <gg@slimlogic.co.uk>
  * Author: Kishon Vijay Abraham I <kishon@ti.com>
  *
  * Based on twl6030_usb.c
  *
  * Author: Hema HK <hemahk@ti.com>
  *
  * 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/module.h>
 #include <linux/interrupt.h>
 #include <linux/platform_device.h>
 #include <linux/slab.h>
 #include <linux/err.h>
 #include <linux/mfd/palmas.h>
 #include <linux/of.h>
 #include <linux/of_platform.h>
 #include <linux/of_gpio.h>
 #include <linux/gpio/consumer.h>
 #include <linux/workqueue.h>

 #define USB_GPIO_DEBOUNCE_MS	20	/* ms */

 static const unsigned int palmas_extcon_cable[] = {
 	EXTCON_USB,
 	EXTCON_USB_HOST,
 	EXTCON_NONE,
 };

 static void palmas_usb_wakeup(struct palmas *palmas, int enable)
 {
 	if (enable)
 		palmas_write(palmas, PALMAS_USB_OTG_BASE, PALMAS_USB_WAKEUP,
 			PALMAS_USB_WAKEUP_ID_WK_UP_COMP);
 	else
 		palmas_write(palmas, PALMAS_USB_OTG_BASE, PALMAS_USB_WAKEUP, 0);
 }

 static irqreturn_t palmas_vbus_irq_handler(int irq, void *_palmas_usb)
 {
 	struct palmas_usb *palmas_usb = _palmas_usb;
 	struct extcon_dev *edev = palmas_usb->edev;
 	unsigned int vbus_line_state;

 	palmas_read(palmas_usb->palmas, PALMAS_INTERRUPT_BASE,
 		PALMAS_INT3_LINE_STATE, &vbus_line_state);

 	if (vbus_line_state & PALMAS_INT3_LINE_STATE_VBUS) {
 		if (palmas_usb->linkstat != PALMAS_USB_STATE_VBUS) {
 			palmas_usb->linkstat = PALMAS_USB_STATE_VBUS;
 			extcon_set_cable_state_(edev, EXTCON_USB, true);
 			dev_info(palmas_usb->dev, "USB cable is attached\n");
 		} else {
 			dev_dbg(palmas_usb->dev,
 				"Spurious connect event detected\n");
 		}
 	} else if (!(vbus_line_state & PALMAS_INT3_LINE_STATE_VBUS)) {
 		if (palmas_usb->linkstat == PALMAS_USB_STATE_VBUS) {
 			palmas_usb->linkstat = PALMAS_USB_STATE_DISCONNECT;
 			extcon_set_cable_state_(edev, EXTCON_USB, false);
 			dev_info(palmas_usb->dev, "USB cable is detached\n");
 		} else {
 			dev_dbg(palmas_usb->dev,
 				"Spurious disconnect event detected\n");
 		}
 	}

 	return IRQ_HANDLED;
 }

 static irqreturn_t palmas_id_irq_handler(int irq, void *_palmas_usb)
 {
 	unsigned int set, id_src;
 	struct palmas_usb *palmas_usb = _palmas_usb;
 	struct extcon_dev *edev = palmas_usb->edev;

 	palmas_read(palmas_usb->palmas, PALMAS_USB_OTG_BASE,
 		PALMAS_USB_ID_INT_LATCH_SET, &set);
 	palmas_read(palmas_usb->palmas, PALMAS_USB_OTG_BASE,
 		PALMAS_USB_ID_INT_SRC, &id_src);

 	if ((set & PALMAS_USB_ID_INT_SRC_ID_GND) &&
 				(id_src & PALMAS_USB_ID_INT_SRC_ID_GND)) {
 		palmas_write(palmas_usb->palmas, PALMAS_USB_OTG_BASE,
 			PALMAS_USB_ID_INT_LATCH_CLR,
 			PALMAS_USB_ID_INT_EN_HI_CLR_ID_GND);
 		palmas_usb->linkstat = PALMAS_USB_STATE_ID;
 		extcon_set_cable_state_(edev, EXTCON_USB_HOST, true);
 		dev_info(palmas_usb->dev, "USB-HOST cable is attached\n");
 	} else if ((set & PALMAS_USB_ID_INT_SRC_ID_FLOAT) &&
 				(id_src & PALMAS_USB_ID_INT_SRC_ID_FLOAT)) {
 		palmas_write(palmas_usb->palmas, PALMAS_USB_OTG_BASE,
 			PALMAS_USB_ID_INT_LATCH_CLR,
 			PALMAS_USB_ID_INT_EN_HI_CLR_ID_FLOAT);
 		palmas_usb->linkstat = PALMAS_USB_STATE_DISCONNECT;
 		extcon_set_cable_state_(edev, EXTCON_USB_HOST, false);
 		dev_info(palmas_usb->dev, "USB-HOST cable is detached\n");
 	} else if ((palmas_usb->linkstat == PALMAS_USB_STATE_ID) &&
 				(!(set & PALMAS_USB_ID_INT_SRC_ID_GND))) {
 		palmas_usb->linkstat = PALMAS_USB_STATE_DISCONNECT;
 		extcon_set_cable_state_(edev, EXTCON_USB_HOST, false);
 		dev_info(palmas_usb->dev, "USB-HOST cable is detached\n");
 	} else if ((palmas_usb->linkstat == PALMAS_USB_STATE_DISCONNECT) &&
 				(id_src & PALMAS_USB_ID_INT_SRC_ID_GND)) {
 		palmas_usb->linkstat = PALMAS_USB_STATE_ID;
 		extcon_set_cable_state_(edev, EXTCON_USB_HOST, true);
 		dev_info(palmas_usb->dev, " USB-HOST cable is attached\n");
 	}

 	return IRQ_HANDLED;
 }

 static void palmas_gpio_id_detect(struct work_struct *work)
 {
 	int id;
 	struct palmas_usb *palmas_usb = container_of(to_delayed_work(work),
 						     struct palmas_usb,
 						     wq_detectid);
 	struct extcon_dev *edev = palmas_usb->edev;

 	if (!palmas_usb->id_gpiod)
 		return;

 	id = gpiod_get_value_cansleep(palmas_usb->id_gpiod);

 	if (id) {
 		extcon_set_cable_state_(edev, EXTCON_USB_HOST, false);
 		dev_info(palmas_usb->dev, "USB-HOST cable is detached\n");
 	} else {
 		extcon_set_cable_state_(edev, EXTCON_USB_HOST, true);
 		dev_info(palmas_usb->dev, "USB-HOST cable is attached\n");
 	}
 }

 static irqreturn_t palmas_gpio_id_irq_handler(int irq, void *_palmas_usb)
 {
 	struct palmas_usb *palmas_usb = _palmas_usb;

 	queue_delayed_work(system_power_efficient_wq, &palmas_usb->wq_detectid,
 			   palmas_usb->sw_debounce_jiffies);

 	return IRQ_HANDLED;
 }

 static void palmas_enable_irq(struct palmas_usb *palmas_usb)
 {
 	palmas_write(palmas_usb->palmas, PALMAS_USB_OTG_BASE,
 		PALMAS_USB_VBUS_CTRL_SET,
 		PALMAS_USB_VBUS_CTRL_SET_VBUS_ACT_COMP);

 	if (palmas_usb->enable_id_detection) {
 		palmas_write(palmas_usb->palmas, PALMAS_USB_OTG_BASE,
 			     PALMAS_USB_ID_CTRL_SET,
 			     PALMAS_USB_ID_CTRL_SET_ID_ACT_COMP);

 		palmas_write(palmas_usb->palmas, PALMAS_USB_OTG_BASE,
 			     PALMAS_USB_ID_INT_EN_HI_SET,
 			     PALMAS_USB_ID_INT_EN_HI_SET_ID_GND |
 			     PALMAS_USB_ID_INT_EN_HI_SET_ID_FLOAT);
 	}

 	if (palmas_usb->enable_vbus_detection)
 		palmas_vbus_irq_handler(palmas_usb->vbus_irq, palmas_usb);

 	/* cold plug for host mode needs this delay */
 	if (palmas_usb->enable_id_detection) {
 		msleep(30);
 		palmas_id_irq_handler(palmas_usb->id_irq, palmas_usb);
 	}
 }

 static int palmas_usb_probe(struct platform_device *pdev)
 {
 	struct palmas *palmas = dev_get_drvdata(pdev->dev.parent);
 	struct palmas_usb_platform_data	*pdata = dev_get_platdata(&pdev->dev);
 	struct device_node *node = pdev->dev.of_node;
 	struct palmas_usb *palmas_usb;
 	int status;

 	palmas_usb = devm_kzalloc(&pdev->dev, sizeof(*palmas_usb), GFP_KERNEL);
 	if (!palmas_usb)
 		return -ENOMEM;

 	if (node && !pdata) {
 		palmas_usb->wakeup = of_property_read_bool(node, "ti,wakeup");
 		palmas_usb->enable_id_detection = of_property_read_bool(node,
 						"ti,enable-id-detection");
 		palmas_usb->enable_vbus_detection = of_property_read_bool(node,
 						"ti,enable-vbus-detection");
 	} else {
 		palmas_usb->wakeup = true;
 		palmas_usb->enable_id_detection = true;
 		palmas_usb->enable_vbus_detection = true;

 		if (pdata)
 			palmas_usb->wakeup = pdata->wakeup;
 	}

 	palmas_usb->id_gpiod = devm_gpiod_get_optional(&pdev->dev, "id",
 							GPIOD_IN);
 	if (IS_ERR(palmas_usb->id_gpiod)) {
 		dev_err(&pdev->dev, "failed to get id gpio\n");
 		return PTR_ERR(palmas_usb->id_gpiod);
 	}

 	palmas_usb->vbus_gpiod = devm_gpiod_get_optional(&pdev->dev, "vbus",
 							GPIOD_IN);
 	if (IS_ERR(palmas_usb->vbus_gpiod)) {
 		dev_err(&pdev->dev, "failed to get vbus gpio\n");
 		return PTR_ERR(palmas_usb->vbus_gpiod);
 	}

 	if (palmas_usb->enable_id_detection && palmas_usb->id_gpiod) {
 		palmas_usb->enable_id_detection = false;
 		palmas_usb->enable_gpio_id_detection = true;
 	}

 	if (palmas_usb->enable_vbus_detection && palmas_usb->vbus_gpiod) {
 		palmas_usb->enable_vbus_detection = false;
 		palmas_usb->enable_gpio_vbus_detection = true;
 	}

 	if (palmas_usb->enable_gpio_id_detection) {
 		u32 debounce;

 		if (of_property_read_u32(node, "debounce-delay-ms", &debounce))
 			debounce = USB_GPIO_DEBOUNCE_MS;

 		status = gpiod_set_debounce(palmas_usb->id_gpiod,
 					    debounce * 1000);
 		if (status < 0)
 			palmas_usb->sw_debounce_jiffies = msecs_to_jiffies(debounce);
 	}

 	INIT_DELAYED_WORK(&palmas_usb->wq_detectid, palmas_gpio_id_detect);

 	palmas->usb = palmas_usb;
 	palmas_usb->palmas = palmas;

 	palmas_usb->dev	 = &pdev->dev;

 	palmas_usb_wakeup(palmas, palmas_usb->wakeup);

 	platform_set_drvdata(pdev, palmas_usb);

 	palmas_usb->edev = devm_extcon_dev_allocate(&pdev->dev,
 						    palmas_extcon_cable);
 	if (IS_ERR(palmas_usb->edev)) {
 		dev_err(&pdev->dev, "failed to allocate extcon device\n");
 		return -ENOMEM;
 	}

 	status = devm_extcon_dev_register(&pdev->dev, palmas_usb->edev);
 	if (status) {
 		dev_err(&pdev->dev, "failed to register extcon device\n");
 		return status;
 	}

 	if (palmas_usb->enable_id_detection) {
 		palmas_usb->id_otg_irq = regmap_irq_get_virq(palmas->irq_data,
 							     PALMAS_ID_OTG_IRQ);
 		palmas_usb->id_irq = regmap_irq_get_virq(palmas->irq_data,
 							 PALMAS_ID_IRQ);
 		status = devm_request_threaded_irq(palmas_usb->dev,
 				palmas_usb->id_irq,
 				NULL, palmas_id_irq_handler,
 				IRQF_TRIGGER_FALLING | IRQF_TRIGGER_RISING |
 				IRQF_ONESHOT,
 				"palmas_usb_id", palmas_usb);
 		if (status < 0) {
 			dev_err(&pdev->dev, "can't get IRQ %d, err %d\n",
 					palmas_usb->id_irq, status);
 			return status;
 		}
 	} else if (palmas_usb->enable_gpio_id_detection) {
 		palmas_usb->gpio_id_irq = gpiod_to_irq(palmas_usb->id_gpiod);
 		if (palmas_usb->gpio_id_irq < 0) {
 			dev_err(&pdev->dev, "failed to get id irq\n");
 			return palmas_usb->gpio_id_irq;
 		}
 		status = devm_request_threaded_irq(&pdev->dev,
 						   palmas_usb->gpio_id_irq,
 						   NULL,
 						   palmas_gpio_id_irq_handler,
 						   IRQF_TRIGGER_RISING |
 						   IRQF_TRIGGER_FALLING |
 						   IRQF_ONESHOT,
 						   "palmas_usb_id",
 						   palmas_usb);
 		if (status < 0) {
 			dev_err(&pdev->dev,
 				"failed to request handler for id irq\n");
 			return status;
 		}
 	}

 	if (palmas_usb->enable_vbus_detection) {
 		palmas_usb->vbus_otg_irq = regmap_irq_get_virq(palmas->irq_data,
 						       PALMAS_VBUS_OTG_IRQ);
 		palmas_usb->vbus_irq = regmap_irq_get_virq(palmas->irq_data,
 							   PALMAS_VBUS_IRQ);
 		status = devm_request_threaded_irq(palmas_usb->dev,
 				palmas_usb->vbus_irq, NULL,
 				palmas_vbus_irq_handler,
 				IRQF_TRIGGER_FALLING | IRQF_TRIGGER_RISING |
 				IRQF_ONESHOT,
 				"palmas_usb_vbus", palmas_usb);
 		if (status < 0) {
 			dev_err(&pdev->dev, "can't get IRQ %d, err %d\n",
 					palmas_usb->vbus_irq, status);
 			return status;
 		}
 	} else if (palmas_usb->enable_gpio_vbus_detection) {
 		/* remux GPIO_1 as VBUSDET */
 		status = palmas_update_bits(palmas,
 			PALMAS_PU_PD_OD_BASE,
 			PALMAS_PRIMARY_SECONDARY_PAD1,
 			PALMAS_PRIMARY_SECONDARY_PAD1_GPIO_1_MASK,
 			(1 << PALMAS_PRIMARY_SECONDARY_PAD1_GPIO_1_SHIFT));
 		if (status < 0) {
 			dev_err(&pdev->dev, "can't remux GPIO1\n");
 			return status;
 		}

 		palmas_usb->vbus_otg_irq = regmap_irq_get_virq(palmas->irq_data,
 						       PALMAS_VBUS_OTG_IRQ);
 		palmas_usb->gpio_vbus_irq = gpiod_to_irq(palmas_usb->vbus_gpiod);
 		if (palmas_usb->gpio_vbus_irq < 0) {
 			dev_err(&pdev->dev, "failed to get vbus irq\n");
 			return palmas_usb->gpio_vbus_irq;
 		}
 		status = devm_request_threaded_irq(&pdev->dev,
 						palmas_usb->gpio_vbus_irq,
 						NULL,
 						palmas_vbus_irq_handler,
 						IRQF_TRIGGER_FALLING |
 						IRQF_TRIGGER_RISING |
 						IRQF_ONESHOT,
 						"palmas_usb_vbus",
 						palmas_usb);
 		if (status < 0) {
 			dev_err(&pdev->dev,
 				"failed to request handler for vbus irq\n");
 			return status;
 		}
 	}

 	palmas_enable_irq(palmas_usb);
 	/* perform initial detection */
 	if (palmas_usb->enable_gpio_vbus_detection)
 		palmas_vbus_irq_handler(palmas_usb->gpio_vbus_irq, palmas_usb);
 	palmas_gpio_id_detect(&palmas_usb->wq_detectid.work);
 	device_set_wakeup_capable(&pdev->dev, true);
 	return 0;
 }

 static int palmas_usb_remove(struct platform_device *pdev)
 {
 	struct palmas_usb *palmas_usb = platform_get_drvdata(pdev);

 	cancel_delayed_work_sync(&palmas_usb->wq_detectid);

 	return 0;
 }

 #ifdef CONFIG_PM_SLEEP
 static int palmas_usb_suspend(struct device *dev)
 {
 	struct palmas_usb *palmas_usb = dev_get_drvdata(dev);

 	if (device_may_wakeup(dev)) {
 		if (palmas_usb->enable_vbus_detection)
 			enable_irq_wake(palmas_usb->vbus_irq);
 		if (palmas_usb->enable_gpio_vbus_detection)
 			enable_irq_wake(palmas_usb->gpio_vbus_irq);
 		if (palmas_usb->enable_id_detection)
 			enable_irq_wake(palmas_usb->id_irq);
 		if (palmas_usb->enable_gpio_id_detection)
 			enable_irq_wake(palmas_usb->gpio_id_irq);
 	}
 	return 0;
 }

 static int palmas_usb_resume(struct device *dev)
 {
 	struct palmas_usb *palmas_usb = dev_get_drvdata(dev);

 	if (device_may_wakeup(dev)) {
 		if (palmas_usb->enable_vbus_detection)
 			disable_irq_wake(palmas_usb->vbus_irq);
 		if (palmas_usb->enable_gpio_vbus_detection)
 			disable_irq_wake(palmas_usb->gpio_vbus_irq);
 		if (palmas_usb->enable_id_detection)
 			disable_irq_wake(palmas_usb->id_irq);
 		if (palmas_usb->enable_gpio_id_detection)
 			disable_irq_wake(palmas_usb->gpio_id_irq);
 	}
 	return 0;
 };
 #endif

 static SIMPLE_DEV_PM_OPS(palmas_pm_ops, palmas_usb_suspend, palmas_usb_resume);

 static const struct of_device_id of_palmas_match_tbl[] = {
 	{ .compatible = "ti,palmas-usb", },
 	{ .compatible = "ti,palmas-usb-vid", },
 	{ .compatible = "ti,twl6035-usb", },
 	{ .compatible = "ti,twl6035-usb-vid", },
 	{ /* end */ }
 };

 static struct platform_driver palmas_usb_driver = {
 	.probe = palmas_usb_probe,
 	.remove = palmas_usb_remove,
 	.driver = {
 		.name = "palmas-usb",
 		.of_match_table = of_palmas_match_tbl,
 		.pm = &palmas_pm_ops,
 	},
 };

 module_platform_driver(palmas_usb_driver);

 MODULE_ALIAS("platform:palmas-usb");
 MODULE_AUTHOR("Graeme Gregory <gg@slimlogic.co.uk>");
 MODULE_DESCRIPTION("Palmas USB transceiver driver");
 MODULE_LICENSE("GPL");
 MODULE_DEVICE_TABLE(of, of_palmas_match_tbl);
	/*
	* Palmas USB transceiver driver
	*
	* Copyright (C) 2013 Texas Instruments Incorporated - http://www.ti.com
	* This program is free software; you can redistribute it and/or modify
	* it under the terms of the GNU General Public License as published by
	* the Free Software Foundation; either version 2 of the License, or
	* (at your option) any later version.
	*
	* Author: Graeme Gregory <gg@slimlogic.co.uk>
	* Author: Kishon Vijay Abraham I <kishon@ti.com>
	*
	* Based on twl6030_usb.c
	*
	* Author: Hema HK <hemahk@ti.com>
	*
	* 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/module.h>
	#include <linux/interrupt.h>
	#include <linux/platform_device.h>
	#include <linux/slab.h>
	#include <linux/err.h>
	#include <linux/mfd/palmas.h>
	#include <linux/of.h>
	#include <linux/of_platform.h>
	#include <linux/of_gpio.h>
	#include <linux/gpio/consumer.h>
	#include <linux/workqueue.h>

	#define USB_GPIO_DEBOUNCE_MS 20 /* ms */

	static const unsigned int palmas_extcon_cable[] = {
	EXTCON_USB,
	EXTCON_USB_HOST,
	EXTCON_NONE,
	};

	static void palmas_usb_wakeup(struct palmas *palmas, int enable)
	{
	if (enable)
	palmas_write(palmas, PALMAS_USB_OTG_BASE, PALMAS_USB_WAKEUP,
	PALMAS_USB_WAKEUP_ID_WK_UP_COMP);
	else
	palmas_write(palmas, PALMAS_USB_OTG_BASE, PALMAS_USB_WAKEUP, 0);
	}

	static irqreturn_t palmas_vbus_irq_handler(int irq, void *_palmas_usb)
	{
	struct palmas_usb *palmas_usb = _palmas_usb;
	struct extcon_dev *edev = palmas_usb->edev;
	unsigned int vbus_line_state;

	palmas_read(palmas_usb->palmas, PALMAS_INTERRUPT_BASE,
	PALMAS_INT3_LINE_STATE, &vbus_line_state);

	if (vbus_line_state & PALMAS_INT3_LINE_STATE_VBUS) {
	if (palmas_usb->linkstat != PALMAS_USB_STATE_VBUS) {
	palmas_usb->linkstat = PALMAS_USB_STATE_VBUS;
	extcon_set_cable_state_(edev, EXTCON_USB, true);
	dev_info(palmas_usb->dev, "USB cable is attached\n");
	} else {
	dev_dbg(palmas_usb->dev,
	"Spurious connect event detected\n");
	}
	} else if (!(vbus_line_state & PALMAS_INT3_LINE_STATE_VBUS)) {
	if (palmas_usb->linkstat == PALMAS_USB_STATE_VBUS) {
	palmas_usb->linkstat = PALMAS_USB_STATE_DISCONNECT;
	extcon_set_cable_state_(edev, EXTCON_USB, false);
	dev_info(palmas_usb->dev, "USB cable is detached\n");
	} else {
	dev_dbg(palmas_usb->dev,
	"Spurious disconnect event detected\n");
	}
	}

	return IRQ_HANDLED;
	}

	static irqreturn_t palmas_id_irq_handler(int irq, void *_palmas_usb)
	{
	unsigned int set, id_src;
	struct palmas_usb *palmas_usb = _palmas_usb;
	struct extcon_dev *edev = palmas_usb->edev;

	palmas_read(palmas_usb->palmas, PALMAS_USB_OTG_BASE,
	PALMAS_USB_ID_INT_LATCH_SET, &set);
	palmas_read(palmas_usb->palmas, PALMAS_USB_OTG_BASE,
	PALMAS_USB_ID_INT_SRC, &id_src);

	if ((set & PALMAS_USB_ID_INT_SRC_ID_GND) &&
	(id_src & PALMAS_USB_ID_INT_SRC_ID_GND)) {
	palmas_write(palmas_usb->palmas, PALMAS_USB_OTG_BASE,
	PALMAS_USB_ID_INT_LATCH_CLR,
	PALMAS_USB_ID_INT_EN_HI_CLR_ID_GND);
	palmas_usb->linkstat = PALMAS_USB_STATE_ID;
	extcon_set_cable_state_(edev, EXTCON_USB_HOST, true);
	dev_info(palmas_usb->dev, "USB-HOST cable is attached\n");
	} else if ((set & PALMAS_USB_ID_INT_SRC_ID_FLOAT) &&
	(id_src & PALMAS_USB_ID_INT_SRC_ID_FLOAT)) {
	palmas_write(palmas_usb->palmas, PALMAS_USB_OTG_BASE,
	PALMAS_USB_ID_INT_LATCH_CLR,
	PALMAS_USB_ID_INT_EN_HI_CLR_ID_FLOAT);
	palmas_usb->linkstat = PALMAS_USB_STATE_DISCONNECT;
	extcon_set_cable_state_(edev, EXTCON_USB_HOST, false);
	dev_info(palmas_usb->dev, "USB-HOST cable is detached\n");
	} else if ((palmas_usb->linkstat == PALMAS_USB_STATE_ID) &&
	(!(set & PALMAS_USB_ID_INT_SRC_ID_GND))) {
	palmas_usb->linkstat = PALMAS_USB_STATE_DISCONNECT;
	extcon_set_cable_state_(edev, EXTCON_USB_HOST, false);
	dev_info(palmas_usb->dev, "USB-HOST cable is detached\n");
	} else if ((palmas_usb->linkstat == PALMAS_USB_STATE_DISCONNECT) &&
	(id_src & PALMAS_USB_ID_INT_SRC_ID_GND)) {
	palmas_usb->linkstat = PALMAS_USB_STATE_ID;
	extcon_set_cable_state_(edev, EXTCON_USB_HOST, true);
	dev_info(palmas_usb->dev, " USB-HOST cable is attached\n");
	}

	return IRQ_HANDLED;
	}

	static void palmas_gpio_id_detect(struct work_struct *work)
	{
	int id;
	struct palmas_usb *palmas_usb = container_of(to_delayed_work(work),
	struct palmas_usb,
	wq_detectid);
	struct extcon_dev *edev = palmas_usb->edev;

	if (!palmas_usb->id_gpiod)
	return;

	id = gpiod_get_value_cansleep(palmas_usb->id_gpiod);

	if (id) {
	extcon_set_cable_state_(edev, EXTCON_USB_HOST, false);
	dev_info(palmas_usb->dev, "USB-HOST cable is detached\n");
	} else {
	extcon_set_cable_state_(edev, EXTCON_USB_HOST, true);
	dev_info(palmas_usb->dev, "USB-HOST cable is attached\n");
	}
	}

	static irqreturn_t palmas_gpio_id_irq_handler(int irq, void *_palmas_usb)
	{
	struct palmas_usb *palmas_usb = _palmas_usb;

	queue_delayed_work(system_power_efficient_wq, &palmas_usb->wq_detectid,
	palmas_usb->sw_debounce_jiffies);

	return IRQ_HANDLED;
	}

	static void palmas_enable_irq(struct palmas_usb *palmas_usb)
	{
	palmas_write(palmas_usb->palmas, PALMAS_USB_OTG_BASE,
	PALMAS_USB_VBUS_CTRL_SET,
	PALMAS_USB_VBUS_CTRL_SET_VBUS_ACT_COMP);

	if (palmas_usb->enable_id_detection) {
	palmas_write(palmas_usb->palmas, PALMAS_USB_OTG_BASE,
	PALMAS_USB_ID_CTRL_SET,
	PALMAS_USB_ID_CTRL_SET_ID_ACT_COMP);

	palmas_write(palmas_usb->palmas, PALMAS_USB_OTG_BASE,
	PALMAS_USB_ID_INT_EN_HI_SET,
	PALMAS_USB_ID_INT_EN_HI_SET_ID_GND \|
	PALMAS_USB_ID_INT_EN_HI_SET_ID_FLOAT);
	}

	if (palmas_usb->enable_vbus_detection)
	palmas_vbus_irq_handler(palmas_usb->vbus_irq, palmas_usb);

	/* cold plug for host mode needs this delay */
	if (palmas_usb->enable_id_detection) {
	msleep(30);
	palmas_id_irq_handler(palmas_usb->id_irq, palmas_usb);
	}
	}

	static int palmas_usb_probe(struct platform_device *pdev)
	{
	struct palmas *palmas = dev_get_drvdata(pdev->dev.parent);
	struct palmas_usb_platform_data *pdata = dev_get_platdata(&pdev->dev);
	struct device_node *node = pdev->dev.of_node;
	struct palmas_usb *palmas_usb;
	int status;

	palmas_usb = devm_kzalloc(&pdev->dev, sizeof(*palmas_usb), GFP_KERNEL);
	if (!palmas_usb)
	return -ENOMEM;

	if (node && !pdata) {
	palmas_usb->wakeup = of_property_read_bool(node, "ti,wakeup");
	palmas_usb->enable_id_detection = of_property_read_bool(node,
	"ti,enable-id-detection");
	palmas_usb->enable_vbus_detection = of_property_read_bool(node,
	"ti,enable-vbus-detection");
	} else {
	palmas_usb->wakeup = true;
	palmas_usb->enable_id_detection = true;
	palmas_usb->enable_vbus_detection = true;

	if (pdata)
	palmas_usb->wakeup = pdata->wakeup;
	}

	palmas_usb->id_gpiod = devm_gpiod_get_optional(&pdev->dev, "id",
	GPIOD_IN);
	if (IS_ERR(palmas_usb->id_gpiod)) {
	dev_err(&pdev->dev, "failed to get id gpio\n");
	return PTR_ERR(palmas_usb->id_gpiod);
	}

	palmas_usb->vbus_gpiod = devm_gpiod_get_optional(&pdev->dev, "vbus",
	GPIOD_IN);
	if (IS_ERR(palmas_usb->vbus_gpiod)) {
	dev_err(&pdev->dev, "failed to get vbus gpio\n");
	return PTR_ERR(palmas_usb->vbus_gpiod);
	}

	if (palmas_usb->enable_id_detection && palmas_usb->id_gpiod) {
	palmas_usb->enable_id_detection = false;
	palmas_usb->enable_gpio_id_detection = true;
	}

	if (palmas_usb->enable_vbus_detection && palmas_usb->vbus_gpiod) {
	palmas_usb->enable_vbus_detection = false;
	palmas_usb->enable_gpio_vbus_detection = true;
	}

	if (palmas_usb->enable_gpio_id_detection) {
	u32 debounce;

	if (of_property_read_u32(node, "debounce-delay-ms", &debounce))
	debounce = USB_GPIO_DEBOUNCE_MS;

	status = gpiod_set_debounce(palmas_usb->id_gpiod,
	debounce * 1000);
	if (status < 0)
	palmas_usb->sw_debounce_jiffies = msecs_to_jiffies(debounce);
	}

	INIT_DELAYED_WORK(&palmas_usb->wq_detectid, palmas_gpio_id_detect);

	palmas->usb = palmas_usb;
	palmas_usb->palmas = palmas;

	palmas_usb->dev = &pdev->dev;

	palmas_usb_wakeup(palmas, palmas_usb->wakeup);

	platform_set_drvdata(pdev, palmas_usb);

	palmas_usb->edev = devm_extcon_dev_allocate(&pdev->dev,
	palmas_extcon_cable);
	if (IS_ERR(palmas_usb->edev)) {
	dev_err(&pdev->dev, "failed to allocate extcon device\n");
	return -ENOMEM;
	}

	status = devm_extcon_dev_register(&pdev->dev, palmas_usb->edev);
	if (status) {
	dev_err(&pdev->dev, "failed to register extcon device\n");
	return status;
	}

	if (palmas_usb->enable_id_detection) {
	palmas_usb->id_otg_irq = regmap_irq_get_virq(palmas->irq_data,
	PALMAS_ID_OTG_IRQ);
	palmas_usb->id_irq = regmap_irq_get_virq(palmas->irq_data,
	PALMAS_ID_IRQ);
	status = devm_request_threaded_irq(palmas_usb->dev,
	palmas_usb->id_irq,
	NULL, palmas_id_irq_handler,
	IRQF_TRIGGER_FALLING \| IRQF_TRIGGER_RISING \|
	IRQF_ONESHOT,
	"palmas_usb_id", palmas_usb);
	if (status < 0) {
	dev_err(&pdev->dev, "can't get IRQ %d, err %d\n",
	palmas_usb->id_irq, status);
	return status;
	}
	} else if (palmas_usb->enable_gpio_id_detection) {
	palmas_usb->gpio_id_irq = gpiod_to_irq(palmas_usb->id_gpiod);
	if (palmas_usb->gpio_id_irq < 0) {
	dev_err(&pdev->dev, "failed to get id irq\n");
	return palmas_usb->gpio_id_irq;
	}
	status = devm_request_threaded_irq(&pdev->dev,
	palmas_usb->gpio_id_irq,
	NULL,
	palmas_gpio_id_irq_handler,
	IRQF_TRIGGER_RISING \|
	IRQF_TRIGGER_FALLING \|
	IRQF_ONESHOT,
	"palmas_usb_id",
	palmas_usb);
	if (status < 0) {
	dev_err(&pdev->dev,
	"failed to request handler for id irq\n");
	return status;
	}
	}

	if (palmas_usb->enable_vbus_detection) {
	palmas_usb->vbus_otg_irq = regmap_irq_get_virq(palmas->irq_data,
	PALMAS_VBUS_OTG_IRQ);
	palmas_usb->vbus_irq = regmap_irq_get_virq(palmas->irq_data,
	PALMAS_VBUS_IRQ);
	status = devm_request_threaded_irq(palmas_usb->dev,
	palmas_usb->vbus_irq, NULL,
	palmas_vbus_irq_handler,
	IRQF_TRIGGER_FALLING \| IRQF_TRIGGER_RISING \|
	IRQF_ONESHOT,
	"palmas_usb_vbus", palmas_usb);
	if (status < 0) {
	dev_err(&pdev->dev, "can't get IRQ %d, err %d\n",
	palmas_usb->vbus_irq, status);
	return status;
	}
	} else if (palmas_usb->enable_gpio_vbus_detection) {
	/* remux GPIO_1 as VBUSDET */
	status = palmas_update_bits(palmas,
	PALMAS_PU_PD_OD_BASE,
	PALMAS_PRIMARY_SECONDARY_PAD1,
	PALMAS_PRIMARY_SECONDARY_PAD1_GPIO_1_MASK,
	(1 << PALMAS_PRIMARY_SECONDARY_PAD1_GPIO_1_SHIFT));
	if (status < 0) {
	dev_err(&pdev->dev, "can't remux GPIO1\n");
	return status;
	}

	palmas_usb->vbus_otg_irq = regmap_irq_get_virq(palmas->irq_data,
	PALMAS_VBUS_OTG_IRQ);
	palmas_usb->gpio_vbus_irq = gpiod_to_irq(palmas_usb->vbus_gpiod);
	if (palmas_usb->gpio_vbus_irq < 0) {
	dev_err(&pdev->dev, "failed to get vbus irq\n");
	return palmas_usb->gpio_vbus_irq;
	}
	status = devm_request_threaded_irq(&pdev->dev,
	palmas_usb->gpio_vbus_irq,
	NULL,
	palmas_vbus_irq_handler,
	IRQF_TRIGGER_FALLING \|
	IRQF_TRIGGER_RISING \|
	IRQF_ONESHOT,
	"palmas_usb_vbus",
	palmas_usb);
	if (status < 0) {
	dev_err(&pdev->dev,
	"failed to request handler for vbus irq\n");
	return status;
	}
	}

	palmas_enable_irq(palmas_usb);
	/* perform initial detection */
	if (palmas_usb->enable_gpio_vbus_detection)
	palmas_vbus_irq_handler(palmas_usb->gpio_vbus_irq, palmas_usb);
	palmas_gpio_id_detect(&palmas_usb->wq_detectid.work);
	device_set_wakeup_capable(&pdev->dev, true);
	return 0;
	}

	static int palmas_usb_remove(struct platform_device *pdev)
	{
	struct palmas_usb *palmas_usb = platform_get_drvdata(pdev);

	cancel_delayed_work_sync(&palmas_usb->wq_detectid);

	return 0;
	}

	#ifdef CONFIG_PM_SLEEP
	static int palmas_usb_suspend(struct device *dev)
	{
	struct palmas_usb *palmas_usb = dev_get_drvdata(dev);

	if (device_may_wakeup(dev)) {
	if (palmas_usb->enable_vbus_detection)
	enable_irq_wake(palmas_usb->vbus_irq);
	if (palmas_usb->enable_gpio_vbus_detection)
	enable_irq_wake(palmas_usb->gpio_vbus_irq);
	if (palmas_usb->enable_id_detection)
	enable_irq_wake(palmas_usb->id_irq);
	if (palmas_usb->enable_gpio_id_detection)
	enable_irq_wake(palmas_usb->gpio_id_irq);
	}
	return 0;
	}

	static int palmas_usb_resume(struct device *dev)
	{
	struct palmas_usb *palmas_usb = dev_get_drvdata(dev);

	if (device_may_wakeup(dev)) {
	if (palmas_usb->enable_vbus_detection)
	disable_irq_wake(palmas_usb->vbus_irq);
	if (palmas_usb->enable_gpio_vbus_detection)
	disable_irq_wake(palmas_usb->gpio_vbus_irq);
	if (palmas_usb->enable_id_detection)
	disable_irq_wake(palmas_usb->id_irq);
	if (palmas_usb->enable_gpio_id_detection)
	disable_irq_wake(palmas_usb->gpio_id_irq);
	}
	return 0;
	};
	#endif

	static SIMPLE_DEV_PM_OPS(palmas_pm_ops, palmas_usb_suspend, palmas_usb_resume);

	static const struct of_device_id of_palmas_match_tbl[] = {
	{ .compatible = "ti,palmas-usb", },
	{ .compatible = "ti,palmas-usb-vid", },
	{ .compatible = "ti,twl6035-usb", },
	{ .compatible = "ti,twl6035-usb-vid", },
	{ /* end */ }
	};

	static struct platform_driver palmas_usb_driver = {
	.probe = palmas_usb_probe,
	.remove = palmas_usb_remove,
	.driver = {
	.name = "palmas-usb",
	.of_match_table = of_palmas_match_tbl,
	.pm = &palmas_pm_ops,
	},
	};

	module_platform_driver(palmas_usb_driver);

	MODULE_ALIAS("platform:palmas-usb");
	MODULE_AUTHOR("Graeme Gregory <gg@slimlogic.co.uk>");
	MODULE_DESCRIPTION("Palmas USB transceiver driver");
	MODULE_LICENSE("GPL");
	MODULE_DEVICE_TABLE(of, of_palmas_match_tbl);