drivers/usb/phy/phy-twl6030-usb.c - kernel/msm-4.9 - Gitiles

 /*
  * twl6030_usb - TWL6030 USB transceiver, talking to OMAP OTG driver.
  *
  * Copyright (C) 2010 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: 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.
  *
  * You should have received a copy of the GNU General Public License
  * along with this program; if not, write to the Free Software
  * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  *
  */

 #include <linux/module.h>
 #include <linux/init.h>
 #include <linux/interrupt.h>
 #include <linux/platform_device.h>
 #include <linux/io.h>
 #include <linux/usb/musb-omap.h>
 #include <linux/usb/phy_companion.h>
 #include <linux/phy/omap_usb.h>
 #include <linux/i2c/twl.h>
 #include <linux/regulator/consumer.h>
 #include <linux/err.h>
 #include <linux/slab.h>
 #include <linux/delay.h>
 #include <linux/of.h>

 /* usb register definitions */
 #define USB_VENDOR_ID_LSB		0x00
 #define USB_VENDOR_ID_MSB		0x01
 #define USB_PRODUCT_ID_LSB		0x02
 #define USB_PRODUCT_ID_MSB		0x03
 #define USB_VBUS_CTRL_SET		0x04
 #define USB_VBUS_CTRL_CLR		0x05
 #define USB_ID_CTRL_SET			0x06
 #define USB_ID_CTRL_CLR			0x07
 #define USB_VBUS_INT_SRC		0x08
 #define USB_VBUS_INT_LATCH_SET		0x09
 #define USB_VBUS_INT_LATCH_CLR		0x0A
 #define USB_VBUS_INT_EN_LO_SET		0x0B
 #define USB_VBUS_INT_EN_LO_CLR		0x0C
 #define USB_VBUS_INT_EN_HI_SET		0x0D
 #define USB_VBUS_INT_EN_HI_CLR		0x0E
 #define USB_ID_INT_SRC			0x0F
 #define USB_ID_INT_LATCH_SET		0x10
 #define USB_ID_INT_LATCH_CLR		0x11

 #define USB_ID_INT_EN_LO_SET		0x12
 #define USB_ID_INT_EN_LO_CLR		0x13
 #define USB_ID_INT_EN_HI_SET		0x14
 #define USB_ID_INT_EN_HI_CLR		0x15
 #define USB_OTG_ADP_CTRL		0x16
 #define USB_OTG_ADP_HIGH		0x17
 #define USB_OTG_ADP_LOW			0x18
 #define USB_OTG_ADP_RISE		0x19
 #define USB_OTG_REVISION		0x1A

 /* to be moved to LDO */
 #define TWL6030_MISC2			0xE5
 #define TWL6030_CFG_LDO_PD2		0xF5
 #define TWL6030_BACKUP_REG		0xFA

 #define STS_HW_CONDITIONS		0x21

 /* In module TWL6030_MODULE_PM_MASTER */
 #define STS_HW_CONDITIONS		0x21
 #define STS_USB_ID			BIT(2)

 /* In module TWL6030_MODULE_PM_RECEIVER */
 #define VUSB_CFG_TRANS			0x71
 #define VUSB_CFG_STATE			0x72
 #define VUSB_CFG_VOLTAGE		0x73

 /* in module TWL6030_MODULE_MAIN_CHARGE */

 #define CHARGERUSB_CTRL1		0x8

 #define CONTROLLER_STAT1		0x03
 #define	VBUS_DET			BIT(2)

 struct twl6030_usb {
 	struct phy_companion	comparator;
 	struct device		*dev;

 	/* for vbus reporting with irqs disabled */
 	spinlock_t		lock;

 	struct regulator		*usb3v3;

 	/* used to set vbus, in atomic path */
 	struct work_struct	set_vbus_work;

 	int			irq1;
 	int			irq2;
 	enum omap_musb_vbus_id_status linkstat;
 	u8			asleep;
 	bool			vbus_enable;
 	const char		*regulator;
 };

 #define	comparator_to_twl(x) container_of((x), struct twl6030_usb, comparator)

 /*-------------------------------------------------------------------------*/

 static inline int twl6030_writeb(struct twl6030_usb *twl, u8 module,
 						u8 data, u8 address)
 {
 	int ret = 0;

 	ret = twl_i2c_write_u8(module, data, address);
 	if (ret < 0)
 		dev_err(twl->dev,
 			"Write[0x%x] Error %d\n", address, ret);
 	return ret;
 }

 static inline u8 twl6030_readb(struct twl6030_usb *twl, u8 module, u8 address)
 {
 	u8 data;
 	int ret;

 	ret = twl_i2c_read_u8(module, &data, address);
 	if (ret >= 0)
 		ret = data;
 	else
 		dev_err(twl->dev,
 			"readb[0x%x,0x%x] Error %d\n",
 					module, address, ret);
 	return ret;
 }

 static int twl6030_start_srp(struct phy_companion *comparator)
 {
 	struct twl6030_usb *twl = comparator_to_twl(comparator);

 	twl6030_writeb(twl, TWL_MODULE_USB, 0x24, USB_VBUS_CTRL_SET);
 	twl6030_writeb(twl, TWL_MODULE_USB, 0x84, USB_VBUS_CTRL_SET);

 	mdelay(100);
 	twl6030_writeb(twl, TWL_MODULE_USB, 0xa0, USB_VBUS_CTRL_CLR);

 	return 0;
 }

 static int twl6030_usb_ldo_init(struct twl6030_usb *twl)
 {
 	/* Set to OTG_REV 1.3 and turn on the ID_WAKEUP_COMP */
 	twl6030_writeb(twl, TWL6030_MODULE_ID0 , 0x1, TWL6030_BACKUP_REG);

 	/* Program CFG_LDO_PD2 register and set VUSB bit */
 	twl6030_writeb(twl, TWL6030_MODULE_ID0 , 0x1, TWL6030_CFG_LDO_PD2);

 	/* Program MISC2 register and set bit VUSB_IN_VBAT */
 	twl6030_writeb(twl, TWL6030_MODULE_ID0 , 0x10, TWL6030_MISC2);

 	twl->usb3v3 = regulator_get(twl->dev, twl->regulator);
 	if (IS_ERR(twl->usb3v3))
 		return -ENODEV;

 	/* Program the USB_VBUS_CTRL_SET and set VBUS_ACT_COMP bit */
 	twl6030_writeb(twl, TWL_MODULE_USB, 0x4, USB_VBUS_CTRL_SET);

 	/*
 	 * Program the USB_ID_CTRL_SET register to enable GND drive
 	 * and the ID comparators
 	 */
 	twl6030_writeb(twl, TWL_MODULE_USB, 0x14, USB_ID_CTRL_SET);

 	return 0;
 }

 static ssize_t twl6030_usb_vbus_show(struct device *dev,
 			struct device_attribute *attr, char *buf)
 {
 	struct twl6030_usb *twl = dev_get_drvdata(dev);
 	unsigned long flags;
 	int ret = -EINVAL;

 	spin_lock_irqsave(&twl->lock, flags);

 	switch (twl->linkstat) {
 	case OMAP_MUSB_VBUS_VALID:
 	       ret = snprintf(buf, PAGE_SIZE, "vbus\n");
 	       break;
 	case OMAP_MUSB_ID_GROUND:
 	       ret = snprintf(buf, PAGE_SIZE, "id\n");
 	       break;
 	case OMAP_MUSB_VBUS_OFF:
 	       ret = snprintf(buf, PAGE_SIZE, "none\n");
 	       break;
 	default:
 	       ret = snprintf(buf, PAGE_SIZE, "UNKNOWN\n");
 	}
 	spin_unlock_irqrestore(&twl->lock, flags);

 	return ret;
 }
 static DEVICE_ATTR(vbus, 0444, twl6030_usb_vbus_show, NULL);

 static irqreturn_t twl6030_usb_irq(int irq, void *_twl)
 {
 	struct twl6030_usb *twl = _twl;
 	enum omap_musb_vbus_id_status status = OMAP_MUSB_UNKNOWN;
 	u8 vbus_state, hw_state;
 	int ret;

 	hw_state = twl6030_readb(twl, TWL6030_MODULE_ID0, STS_HW_CONDITIONS);

 	vbus_state = twl6030_readb(twl, TWL_MODULE_MAIN_CHARGE,
 						CONTROLLER_STAT1);
 	if (!(hw_state & STS_USB_ID)) {
 		if (vbus_state & VBUS_DET) {
 			ret = regulator_enable(twl->usb3v3);
 			if (ret)
 				dev_err(twl->dev, "Failed to enable usb3v3\n");

 			twl->asleep = 1;
 			status = OMAP_MUSB_VBUS_VALID;
 			twl->linkstat = status;
 			omap_musb_mailbox(status);
 		} else {
 			if (twl->linkstat != OMAP_MUSB_UNKNOWN) {
 				status = OMAP_MUSB_VBUS_OFF;
 				twl->linkstat = status;
 				omap_musb_mailbox(status);
 				if (twl->asleep) {
 					regulator_disable(twl->usb3v3);
 					twl->asleep = 0;
 				}
 			}
 		}
 	}
 	sysfs_notify(&twl->dev->kobj, NULL, "vbus");

 	return IRQ_HANDLED;
 }

 static irqreturn_t twl6030_usbotg_irq(int irq, void *_twl)
 {
 	struct twl6030_usb *twl = _twl;
 	enum omap_musb_vbus_id_status status = OMAP_MUSB_UNKNOWN;
 	u8 hw_state;
 	int ret;

 	hw_state = twl6030_readb(twl, TWL6030_MODULE_ID0, STS_HW_CONDITIONS);

 	if (hw_state & STS_USB_ID) {
 		ret = regulator_enable(twl->usb3v3);
 		if (ret)
 			dev_err(twl->dev, "Failed to enable usb3v3\n");

 		twl->asleep = 1;
 		twl6030_writeb(twl, TWL_MODULE_USB, 0x1, USB_ID_INT_EN_HI_CLR);
 		twl6030_writeb(twl, TWL_MODULE_USB, 0x10, USB_ID_INT_EN_HI_SET);
 		status = OMAP_MUSB_ID_GROUND;
 		twl->linkstat = status;
 		omap_musb_mailbox(status);
 	} else  {
 		twl6030_writeb(twl, TWL_MODULE_USB, 0x10, USB_ID_INT_EN_HI_CLR);
 		twl6030_writeb(twl, TWL_MODULE_USB, 0x1, USB_ID_INT_EN_HI_SET);
 	}
 	twl6030_writeb(twl, TWL_MODULE_USB, status, USB_ID_INT_LATCH_CLR);

 	return IRQ_HANDLED;
 }

 static int twl6030_enable_irq(struct twl6030_usb *twl)
 {
 	twl6030_writeb(twl, TWL_MODULE_USB, 0x1, USB_ID_INT_EN_HI_SET);
 	twl6030_interrupt_unmask(0x05, REG_INT_MSK_LINE_C);
 	twl6030_interrupt_unmask(0x05, REG_INT_MSK_STS_C);

 	twl6030_interrupt_unmask(TWL6030_CHARGER_CTRL_INT_MASK,
 				REG_INT_MSK_LINE_C);
 	twl6030_interrupt_unmask(TWL6030_CHARGER_CTRL_INT_MASK,
 				REG_INT_MSK_STS_C);
 	twl6030_usb_irq(twl->irq2, twl);
 	twl6030_usbotg_irq(twl->irq1, twl);

 	return 0;
 }

 static void otg_set_vbus_work(struct work_struct *data)
 {
 	struct twl6030_usb *twl = container_of(data, struct twl6030_usb,
 								set_vbus_work);

 	/*
 	 * Start driving VBUS. Set OPA_MODE bit in CHARGERUSB_CTRL1
 	 * register. This enables boost mode.
 	 */

 	if (twl->vbus_enable)
 		twl6030_writeb(twl, TWL_MODULE_MAIN_CHARGE , 0x40,
 							CHARGERUSB_CTRL1);
 	else
 		twl6030_writeb(twl, TWL_MODULE_MAIN_CHARGE , 0x00,
 							CHARGERUSB_CTRL1);
 }

 static int twl6030_set_vbus(struct phy_companion *comparator, bool enabled)
 {
 	struct twl6030_usb *twl = comparator_to_twl(comparator);

 	twl->vbus_enable = enabled;
 	schedule_work(&twl->set_vbus_work);

 	return 0;
 }

 static int twl6030_usb_probe(struct platform_device *pdev)
 {
 	u32 ret;
 	struct twl6030_usb	*twl;
 	int			status, err;
 	struct device_node	*np = pdev->dev.of_node;
 	struct device		*dev = &pdev->dev;
 	struct twl4030_usb_data	*pdata = dev_get_platdata(dev);

 	twl = devm_kzalloc(dev, sizeof(*twl), GFP_KERNEL);
 	if (!twl)
 		return -ENOMEM;

 	twl->dev		= &pdev->dev;
 	twl->irq1		= platform_get_irq(pdev, 0);
 	twl->irq2		= platform_get_irq(pdev, 1);
 	twl->linkstat		= OMAP_MUSB_UNKNOWN;

 	twl->comparator.set_vbus	= twl6030_set_vbus;
 	twl->comparator.start_srp	= twl6030_start_srp;

 	ret = omap_usb2_set_comparator(&twl->comparator);
 	if (ret == -ENODEV) {
 		dev_info(&pdev->dev, "phy not ready, deferring probe");
 		return -EPROBE_DEFER;
 	}

 	if (np) {
 		twl->regulator = "usb";
 	} else if (pdata) {
 		if (pdata->features & TWL6032_SUBCLASS)
 			twl->regulator = "ldousb";
 		else
 			twl->regulator = "vusb";
 	} else {
 		dev_err(&pdev->dev, "twl6030 initialized without pdata\n");
 		return -EINVAL;
 	}

 	/* init spinlock for workqueue */
 	spin_lock_init(&twl->lock);

 	err = twl6030_usb_ldo_init(twl);
 	if (err) {
 		dev_err(&pdev->dev, "ldo init failed\n");
 		return err;
 	}

 	platform_set_drvdata(pdev, twl);
 	if (device_create_file(&pdev->dev, &dev_attr_vbus))
 		dev_warn(&pdev->dev, "could not create sysfs file\n");

 	INIT_WORK(&twl->set_vbus_work, otg_set_vbus_work);

 	status = request_threaded_irq(twl->irq1, NULL, twl6030_usbotg_irq,
 			IRQF_TRIGGER_FALLING | IRQF_TRIGGER_RISING | IRQF_ONESHOT,
 			"twl6030_usb", twl);
 	if (status < 0) {
 		dev_err(&pdev->dev, "can't get IRQ %d, err %d\n",
 			twl->irq1, status);
 		device_remove_file(twl->dev, &dev_attr_vbus);
 		return status;
 	}

 	status = request_threaded_irq(twl->irq2, NULL, twl6030_usb_irq,
 			IRQF_TRIGGER_FALLING | IRQF_TRIGGER_RISING | IRQF_ONESHOT,
 			"twl6030_usb", twl);
 	if (status < 0) {
 		dev_err(&pdev->dev, "can't get IRQ %d, err %d\n",
 			twl->irq2, status);
 		free_irq(twl->irq1, twl);
 		device_remove_file(twl->dev, &dev_attr_vbus);
 		return status;
 	}

 	twl->asleep = 0;
 	twl6030_enable_irq(twl);
 	dev_info(&pdev->dev, "Initialized TWL6030 USB module\n");

 	return 0;
 }

 static int twl6030_usb_remove(struct platform_device *pdev)
 {
 	struct twl6030_usb *twl = platform_get_drvdata(pdev);

 	twl6030_interrupt_mask(TWL6030_USBOTG_INT_MASK,
 		REG_INT_MSK_LINE_C);
 	twl6030_interrupt_mask(TWL6030_USBOTG_INT_MASK,
 			REG_INT_MSK_STS_C);
 	free_irq(twl->irq1, twl);
 	free_irq(twl->irq2, twl);
 	regulator_put(twl->usb3v3);
 	device_remove_file(twl->dev, &dev_attr_vbus);
 	cancel_work_sync(&twl->set_vbus_work);

 	return 0;
 }

 #ifdef CONFIG_OF
 static const struct of_device_id twl6030_usb_id_table[] = {
 	{ .compatible = "ti,twl6030-usb" },
 	{}
 };
 MODULE_DEVICE_TABLE(of, twl6030_usb_id_table);
 #endif

 static struct platform_driver twl6030_usb_driver = {
 	.probe		= twl6030_usb_probe,
 	.remove		= twl6030_usb_remove,
 	.driver		= {
 		.name	= "twl6030_usb",
 		.of_match_table = of_match_ptr(twl6030_usb_id_table),
 	},
 };

 static int __init twl6030_usb_init(void)
 {
 	return platform_driver_register(&twl6030_usb_driver);
 }
 subsys_initcall(twl6030_usb_init);

 static void __exit twl6030_usb_exit(void)
 {
 	platform_driver_unregister(&twl6030_usb_driver);
 }
 module_exit(twl6030_usb_exit);

 MODULE_ALIAS("platform:twl6030_usb");
 MODULE_AUTHOR("Hema HK <hemahk@ti.com>");
 MODULE_DESCRIPTION("TWL6030 USB transceiver driver");
 MODULE_LICENSE("GPL");
	/*
	* twl6030_usb - TWL6030 USB transceiver, talking to OMAP OTG driver.
	*
	* Copyright (C) 2010 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: 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.
	*
	* You should have received a copy of the GNU General Public License
	* along with this program; if not, write to the Free Software
	* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
	*
	*/

	#include <linux/module.h>
	#include <linux/init.h>
	#include <linux/interrupt.h>
	#include <linux/platform_device.h>
	#include <linux/io.h>
	#include <linux/usb/musb-omap.h>
	#include <linux/usb/phy_companion.h>
	#include <linux/phy/omap_usb.h>
	#include <linux/i2c/twl.h>
	#include <linux/regulator/consumer.h>
	#include <linux/err.h>
	#include <linux/slab.h>
	#include <linux/delay.h>
	#include <linux/of.h>

	/* usb register definitions */
	#define USB_VENDOR_ID_LSB 0x00
	#define USB_VENDOR_ID_MSB 0x01
	#define USB_PRODUCT_ID_LSB 0x02
	#define USB_PRODUCT_ID_MSB 0x03
	#define USB_VBUS_CTRL_SET 0x04
	#define USB_VBUS_CTRL_CLR 0x05
	#define USB_ID_CTRL_SET 0x06
	#define USB_ID_CTRL_CLR 0x07
	#define USB_VBUS_INT_SRC 0x08
	#define USB_VBUS_INT_LATCH_SET 0x09
	#define USB_VBUS_INT_LATCH_CLR 0x0A
	#define USB_VBUS_INT_EN_LO_SET 0x0B
	#define USB_VBUS_INT_EN_LO_CLR 0x0C
	#define USB_VBUS_INT_EN_HI_SET 0x0D
	#define USB_VBUS_INT_EN_HI_CLR 0x0E
	#define USB_ID_INT_SRC 0x0F
	#define USB_ID_INT_LATCH_SET 0x10
	#define USB_ID_INT_LATCH_CLR 0x11

	#define USB_ID_INT_EN_LO_SET 0x12
	#define USB_ID_INT_EN_LO_CLR 0x13
	#define USB_ID_INT_EN_HI_SET 0x14
	#define USB_ID_INT_EN_HI_CLR 0x15
	#define USB_OTG_ADP_CTRL 0x16
	#define USB_OTG_ADP_HIGH 0x17
	#define USB_OTG_ADP_LOW 0x18
	#define USB_OTG_ADP_RISE 0x19
	#define USB_OTG_REVISION 0x1A

	/* to be moved to LDO */
	#define TWL6030_MISC2 0xE5
	#define TWL6030_CFG_LDO_PD2 0xF5
	#define TWL6030_BACKUP_REG 0xFA

	#define STS_HW_CONDITIONS 0x21

	/* In module TWL6030_MODULE_PM_MASTER */
	#define STS_HW_CONDITIONS 0x21
	#define STS_USB_ID BIT(2)

	/* In module TWL6030_MODULE_PM_RECEIVER */
	#define VUSB_CFG_TRANS 0x71
	#define VUSB_CFG_STATE 0x72
	#define VUSB_CFG_VOLTAGE 0x73

	/* in module TWL6030_MODULE_MAIN_CHARGE */

	#define CHARGERUSB_CTRL1 0x8

	#define CONTROLLER_STAT1 0x03
	#define VBUS_DET BIT(2)

	struct twl6030_usb {
	struct phy_companion comparator;
	struct device *dev;

	/* for vbus reporting with irqs disabled */
	spinlock_t lock;

	struct regulator *usb3v3;

	/* used to set vbus, in atomic path */
	struct work_struct set_vbus_work;

	int irq1;
	int irq2;
	enum omap_musb_vbus_id_status linkstat;
	u8 asleep;
	bool vbus_enable;
	const char *regulator;
	};

	#define comparator_to_twl(x) container_of((x), struct twl6030_usb, comparator)

	/-------------------------------------------------------------------------/

	static inline int twl6030_writeb(struct twl6030_usb *twl, u8 module,
	u8 data, u8 address)
	{
	int ret = 0;

	ret = twl_i2c_write_u8(module, data, address);
	if (ret < 0)
	dev_err(twl->dev,
	"Write[0x%x] Error %d\n", address, ret);
	return ret;
	}

	static inline u8 twl6030_readb(struct twl6030_usb *twl, u8 module, u8 address)
	{
	u8 data;
	int ret;

	ret = twl_i2c_read_u8(module, &data, address);
	if (ret >= 0)
	ret = data;
	else
	dev_err(twl->dev,
	"readb[0x%x,0x%x] Error %d\n",
	module, address, ret);
	return ret;
	}

	static int twl6030_start_srp(struct phy_companion *comparator)
	{
	struct twl6030_usb *twl = comparator_to_twl(comparator);

	twl6030_writeb(twl, TWL_MODULE_USB, 0x24, USB_VBUS_CTRL_SET);
	twl6030_writeb(twl, TWL_MODULE_USB, 0x84, USB_VBUS_CTRL_SET);

	mdelay(100);
	twl6030_writeb(twl, TWL_MODULE_USB, 0xa0, USB_VBUS_CTRL_CLR);

	return 0;
	}

	static int twl6030_usb_ldo_init(struct twl6030_usb *twl)
	{
	/* Set to OTG_REV 1.3 and turn on the ID_WAKEUP_COMP */
	twl6030_writeb(twl, TWL6030_MODULE_ID0 , 0x1, TWL6030_BACKUP_REG);

	/* Program CFG_LDO_PD2 register and set VUSB bit */
	twl6030_writeb(twl, TWL6030_MODULE_ID0 , 0x1, TWL6030_CFG_LDO_PD2);

	/* Program MISC2 register and set bit VUSB_IN_VBAT */
	twl6030_writeb(twl, TWL6030_MODULE_ID0 , 0x10, TWL6030_MISC2);

	twl->usb3v3 = regulator_get(twl->dev, twl->regulator);
	if (IS_ERR(twl->usb3v3))
	return -ENODEV;

	/* Program the USB_VBUS_CTRL_SET and set VBUS_ACT_COMP bit */
	twl6030_writeb(twl, TWL_MODULE_USB, 0x4, USB_VBUS_CTRL_SET);

	/*
	* Program the USB_ID_CTRL_SET register to enable GND drive
	* and the ID comparators
	*/
	twl6030_writeb(twl, TWL_MODULE_USB, 0x14, USB_ID_CTRL_SET);

	return 0;
	}

	static ssize_t twl6030_usb_vbus_show(struct device *dev,
	struct device_attribute attr, char buf)
	{
	struct twl6030_usb *twl = dev_get_drvdata(dev);
	unsigned long flags;
	int ret = -EINVAL;

	spin_lock_irqsave(&twl->lock, flags);

	switch (twl->linkstat) {
	case OMAP_MUSB_VBUS_VALID:
	ret = snprintf(buf, PAGE_SIZE, "vbus\n");
	break;
	case OMAP_MUSB_ID_GROUND:
	ret = snprintf(buf, PAGE_SIZE, "id\n");
	break;
	case OMAP_MUSB_VBUS_OFF:
	ret = snprintf(buf, PAGE_SIZE, "none\n");
	break;
	default:
	ret = snprintf(buf, PAGE_SIZE, "UNKNOWN\n");
	}
	spin_unlock_irqrestore(&twl->lock, flags);

	return ret;
	}
	static DEVICE_ATTR(vbus, 0444, twl6030_usb_vbus_show, NULL);

	static irqreturn_t twl6030_usb_irq(int irq, void *_twl)
	{
	struct twl6030_usb *twl = _twl;
	enum omap_musb_vbus_id_status status = OMAP_MUSB_UNKNOWN;
	u8 vbus_state, hw_state;
	int ret;

	hw_state = twl6030_readb(twl, TWL6030_MODULE_ID0, STS_HW_CONDITIONS);

	vbus_state = twl6030_readb(twl, TWL_MODULE_MAIN_CHARGE,
	CONTROLLER_STAT1);
	if (!(hw_state & STS_USB_ID)) {
	if (vbus_state & VBUS_DET) {
	ret = regulator_enable(twl->usb3v3);
	if (ret)
	dev_err(twl->dev, "Failed to enable usb3v3\n");

	twl->asleep = 1;
	status = OMAP_MUSB_VBUS_VALID;
	twl->linkstat = status;
	omap_musb_mailbox(status);
	} else {
	if (twl->linkstat != OMAP_MUSB_UNKNOWN) {
	status = OMAP_MUSB_VBUS_OFF;
	twl->linkstat = status;
	omap_musb_mailbox(status);
	if (twl->asleep) {
	regulator_disable(twl->usb3v3);
	twl->asleep = 0;
	}
	}
	}
	}
	sysfs_notify(&twl->dev->kobj, NULL, "vbus");

	return IRQ_HANDLED;
	}

	static irqreturn_t twl6030_usbotg_irq(int irq, void *_twl)
	{
	struct twl6030_usb *twl = _twl;
	enum omap_musb_vbus_id_status status = OMAP_MUSB_UNKNOWN;
	u8 hw_state;
	int ret;

	hw_state = twl6030_readb(twl, TWL6030_MODULE_ID0, STS_HW_CONDITIONS);

	if (hw_state & STS_USB_ID) {
	ret = regulator_enable(twl->usb3v3);
	if (ret)
	dev_err(twl->dev, "Failed to enable usb3v3\n");

	twl->asleep = 1;
	twl6030_writeb(twl, TWL_MODULE_USB, 0x1, USB_ID_INT_EN_HI_CLR);
	twl6030_writeb(twl, TWL_MODULE_USB, 0x10, USB_ID_INT_EN_HI_SET);
	status = OMAP_MUSB_ID_GROUND;
	twl->linkstat = status;
	omap_musb_mailbox(status);
	} else {
	twl6030_writeb(twl, TWL_MODULE_USB, 0x10, USB_ID_INT_EN_HI_CLR);
	twl6030_writeb(twl, TWL_MODULE_USB, 0x1, USB_ID_INT_EN_HI_SET);
	}
	twl6030_writeb(twl, TWL_MODULE_USB, status, USB_ID_INT_LATCH_CLR);

	return IRQ_HANDLED;
	}

	static int twl6030_enable_irq(struct twl6030_usb *twl)
	{
	twl6030_writeb(twl, TWL_MODULE_USB, 0x1, USB_ID_INT_EN_HI_SET);
	twl6030_interrupt_unmask(0x05, REG_INT_MSK_LINE_C);
	twl6030_interrupt_unmask(0x05, REG_INT_MSK_STS_C);

	twl6030_interrupt_unmask(TWL6030_CHARGER_CTRL_INT_MASK,
	REG_INT_MSK_LINE_C);
	twl6030_interrupt_unmask(TWL6030_CHARGER_CTRL_INT_MASK,
	REG_INT_MSK_STS_C);
	twl6030_usb_irq(twl->irq2, twl);
	twl6030_usbotg_irq(twl->irq1, twl);

	return 0;
	}

	static void otg_set_vbus_work(struct work_struct *data)
	{
	struct twl6030_usb *twl = container_of(data, struct twl6030_usb,
	set_vbus_work);

	/*
	* Start driving VBUS. Set OPA_MODE bit in CHARGERUSB_CTRL1
	* register. This enables boost mode.
	*/

	if (twl->vbus_enable)
	twl6030_writeb(twl, TWL_MODULE_MAIN_CHARGE , 0x40,
	CHARGERUSB_CTRL1);
	else
	twl6030_writeb(twl, TWL_MODULE_MAIN_CHARGE , 0x00,
	CHARGERUSB_CTRL1);
	}

	static int twl6030_set_vbus(struct phy_companion *comparator, bool enabled)
	{
	struct twl6030_usb *twl = comparator_to_twl(comparator);

	twl->vbus_enable = enabled;
	schedule_work(&twl->set_vbus_work);

	return 0;
	}

	static int twl6030_usb_probe(struct platform_device *pdev)
	{
	u32 ret;
	struct twl6030_usb *twl;
	int status, err;
	struct device_node *np = pdev->dev.of_node;
	struct device *dev = &pdev->dev;
	struct twl4030_usb_data *pdata = dev_get_platdata(dev);

	twl = devm_kzalloc(dev, sizeof(*twl), GFP_KERNEL);
	if (!twl)
	return -ENOMEM;

	twl->dev = &pdev->dev;
	twl->irq1 = platform_get_irq(pdev, 0);
	twl->irq2 = platform_get_irq(pdev, 1);
	twl->linkstat = OMAP_MUSB_UNKNOWN;

	twl->comparator.set_vbus = twl6030_set_vbus;
	twl->comparator.start_srp = twl6030_start_srp;

	ret = omap_usb2_set_comparator(&twl->comparator);
	if (ret == -ENODEV) {
	dev_info(&pdev->dev, "phy not ready, deferring probe");
	return -EPROBE_DEFER;
	}

	if (np) {
	twl->regulator = "usb";
	} else if (pdata) {
	if (pdata->features & TWL6032_SUBCLASS)
	twl->regulator = "ldousb";
	else
	twl->regulator = "vusb";
	} else {
	dev_err(&pdev->dev, "twl6030 initialized without pdata\n");
	return -EINVAL;
	}

	/* init spinlock for workqueue */
	spin_lock_init(&twl->lock);

	err = twl6030_usb_ldo_init(twl);
	if (err) {
	dev_err(&pdev->dev, "ldo init failed\n");
	return err;
	}

	platform_set_drvdata(pdev, twl);
	if (device_create_file(&pdev->dev, &dev_attr_vbus))
	dev_warn(&pdev->dev, "could not create sysfs file\n");

	INIT_WORK(&twl->set_vbus_work, otg_set_vbus_work);

	status = request_threaded_irq(twl->irq1, NULL, twl6030_usbotg_irq,
	IRQF_TRIGGER_FALLING \| IRQF_TRIGGER_RISING \| IRQF_ONESHOT,
	"twl6030_usb", twl);
	if (status < 0) {
	dev_err(&pdev->dev, "can't get IRQ %d, err %d\n",
	twl->irq1, status);
	device_remove_file(twl->dev, &dev_attr_vbus);
	return status;
	}

	status = request_threaded_irq(twl->irq2, NULL, twl6030_usb_irq,
	IRQF_TRIGGER_FALLING \| IRQF_TRIGGER_RISING \| IRQF_ONESHOT,
	"twl6030_usb", twl);
	if (status < 0) {
	dev_err(&pdev->dev, "can't get IRQ %d, err %d\n",
	twl->irq2, status);
	free_irq(twl->irq1, twl);
	device_remove_file(twl->dev, &dev_attr_vbus);
	return status;
	}

	twl->asleep = 0;
	twl6030_enable_irq(twl);
	dev_info(&pdev->dev, "Initialized TWL6030 USB module\n");

	return 0;
	}

	static int twl6030_usb_remove(struct platform_device *pdev)
	{
	struct twl6030_usb *twl = platform_get_drvdata(pdev);

	twl6030_interrupt_mask(TWL6030_USBOTG_INT_MASK,
	REG_INT_MSK_LINE_C);
	twl6030_interrupt_mask(TWL6030_USBOTG_INT_MASK,
	REG_INT_MSK_STS_C);
	free_irq(twl->irq1, twl);
	free_irq(twl->irq2, twl);
	regulator_put(twl->usb3v3);
	device_remove_file(twl->dev, &dev_attr_vbus);
	cancel_work_sync(&twl->set_vbus_work);

	return 0;
	}

	#ifdef CONFIG_OF
	static const struct of_device_id twl6030_usb_id_table[] = {
	{ .compatible = "ti,twl6030-usb" },
	{}
	};
	MODULE_DEVICE_TABLE(of, twl6030_usb_id_table);
	#endif

	static struct platform_driver twl6030_usb_driver = {
	.probe = twl6030_usb_probe,
	.remove = twl6030_usb_remove,
	.driver = {
	.name = "twl6030_usb",
	.of_match_table = of_match_ptr(twl6030_usb_id_table),
	},
	};

	static int __init twl6030_usb_init(void)
	{
	return platform_driver_register(&twl6030_usb_driver);
	}
	subsys_initcall(twl6030_usb_init);

	static void __exit twl6030_usb_exit(void)
	{
	platform_driver_unregister(&twl6030_usb_driver);
	}
	module_exit(twl6030_usb_exit);

	MODULE_ALIAS("platform:twl6030_usb");
	MODULE_AUTHOR("Hema HK <hemahk@ti.com>");
	MODULE_DESCRIPTION("TWL6030 USB transceiver driver");
	MODULE_LICENSE("GPL");