drivers/power/isp1704_charger.c - maze/linux - Git at Google

 /*
  * ISP1704 USB Charger Detection driver
  *
  * Copyright (C) 2010 Nokia Corporation
  *
  * 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.
  *
  * 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., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
  */

 #include <linux/kernel.h>
 #include <linux/module.h>
 #include <linux/err.h>
 #include <linux/init.h>
 #include <linux/types.h>
 #include <linux/device.h>
 #include <linux/sysfs.h>
 #include <linux/platform_device.h>
 #include <linux/power_supply.h>
 #include <linux/delay.h>

 #include <linux/usb/otg.h>
 #include <linux/usb/ulpi.h>
 #include <linux/usb/ch9.h>
 #include <linux/usb/gadget.h>

 /* Vendor specific Power Control register */
 #define ISP1704_PWR_CTRL		0x3d
 #define ISP1704_PWR_CTRL_SWCTRL		(1 << 0)
 #define ISP1704_PWR_CTRL_DET_COMP	(1 << 1)
 #define ISP1704_PWR_CTRL_BVALID_RISE	(1 << 2)
 #define ISP1704_PWR_CTRL_BVALID_FALL	(1 << 3)
 #define ISP1704_PWR_CTRL_DP_WKPU_EN	(1 << 4)
 #define ISP1704_PWR_CTRL_VDAT_DET	(1 << 5)
 #define ISP1704_PWR_CTRL_DPVSRC_EN	(1 << 6)
 #define ISP1704_PWR_CTRL_HWDETECT	(1 << 7)

 #define NXP_VENDOR_ID			0x04cc

 static u16 isp170x_id[] = {
 	0x1704,
 	0x1707,
 };

 struct isp1704_charger {
 	struct device		*dev;
 	struct power_supply	psy;
 	struct otg_transceiver	*otg;
 	struct notifier_block	nb;
 	struct work_struct	work;

 	char			model[7];
 	unsigned		present:1;
 };

 /*
  * ISP1704 detects PS/2 adapters as charger. To make sure the detected charger
  * is actually a dedicated charger, the following steps need to be taken.
  */
 static inline int isp1704_charger_verify(struct isp1704_charger *isp)
 {
 	int	ret = 0;
 	u8	r;

 	/* Reset the transceiver */
 	r = otg_io_read(isp->otg, ULPI_FUNC_CTRL);
 	r |= ULPI_FUNC_CTRL_RESET;
 	otg_io_write(isp->otg, ULPI_FUNC_CTRL, r);
 	usleep_range(1000, 2000);

 	/* Set normal mode */
 	r &= ~(ULPI_FUNC_CTRL_RESET | ULPI_FUNC_CTRL_OPMODE_MASK);
 	otg_io_write(isp->otg, ULPI_FUNC_CTRL, r);

 	/* Clear the DP and DM pull-down bits */
 	r = ULPI_OTG_CTRL_DP_PULLDOWN | ULPI_OTG_CTRL_DM_PULLDOWN;
 	otg_io_write(isp->otg, ULPI_CLR(ULPI_OTG_CTRL), r);

 	/* Enable strong pull-up on DP (1.5K) and reset */
 	r = ULPI_FUNC_CTRL_TERMSELECT | ULPI_FUNC_CTRL_RESET;
 	otg_io_write(isp->otg, ULPI_SET(ULPI_FUNC_CTRL), r);
 	usleep_range(1000, 2000);

 	/* Read the line state */
 	if (!otg_io_read(isp->otg, ULPI_DEBUG)) {
 		/* Disable strong pull-up on DP (1.5K) */
 		otg_io_write(isp->otg, ULPI_CLR(ULPI_FUNC_CTRL),
 				ULPI_FUNC_CTRL_TERMSELECT);
 		return 1;
 	}

 	/* Is it a charger or PS/2 connection */

 	/* Enable weak pull-up resistor on DP */
 	otg_io_write(isp->otg, ULPI_SET(ISP1704_PWR_CTRL),
 			ISP1704_PWR_CTRL_DP_WKPU_EN);

 	/* Disable strong pull-up on DP (1.5K) */
 	otg_io_write(isp->otg, ULPI_CLR(ULPI_FUNC_CTRL),
 			ULPI_FUNC_CTRL_TERMSELECT);

 	/* Enable weak pull-down resistor on DM */
 	otg_io_write(isp->otg, ULPI_SET(ULPI_OTG_CTRL),
 			ULPI_OTG_CTRL_DM_PULLDOWN);

 	/* It's a charger if the line states are clear */
 	if (!(otg_io_read(isp->otg, ULPI_DEBUG)))
 		ret = 1;

 	/* Disable weak pull-up resistor on DP */
 	otg_io_write(isp->otg, ULPI_CLR(ISP1704_PWR_CTRL),
 			ISP1704_PWR_CTRL_DP_WKPU_EN);

 	return ret;
 }

 static inline int isp1704_charger_detect(struct isp1704_charger *isp)
 {
 	unsigned long	timeout;
 	u8		r;
 	int		ret = 0;

 	/* set SW control bit in PWR_CTRL register */
 	otg_io_write(isp->otg, ISP1704_PWR_CTRL,
 			ISP1704_PWR_CTRL_SWCTRL);

 	/* enable manual charger detection */
 	r = (ISP1704_PWR_CTRL_SWCTRL | ISP1704_PWR_CTRL_DPVSRC_EN);
 	otg_io_write(isp->otg, ULPI_SET(ISP1704_PWR_CTRL), r);
 	usleep_range(1000, 2000);

 	timeout = jiffies + msecs_to_jiffies(300);
 	do {
 		/* Check if there is a charger */
 		if (otg_io_read(isp->otg, ISP1704_PWR_CTRL)
 				& ISP1704_PWR_CTRL_VDAT_DET) {
 			ret = isp1704_charger_verify(isp);
 			break;
 		}
 	} while (!time_after(jiffies, timeout));

 	return ret;
 }

 static void isp1704_charger_work(struct work_struct *data)
 {
 	int			detect;
 	struct isp1704_charger	*isp =
 		container_of(data, struct isp1704_charger, work);

 	/*
 	 * FIXME Only supporting dedicated chargers even though isp1704 can
 	 * detect HUB and HOST chargers. If the device has already been
 	 * enumerated, the detection will break the connection.
 	 */
 	if (isp->otg->state != OTG_STATE_B_IDLE)
 		return;

 	/* disable data pullups */
 	if (isp->otg->gadget)
 		usb_gadget_disconnect(isp->otg->gadget);

 	/* detect charger */
 	detect = isp1704_charger_detect(isp);
 	if (detect) {
 		isp->present = detect;
 		power_supply_changed(&isp->psy);
 	}

 	/* enable data pullups */
 	if (isp->otg->gadget)
 		usb_gadget_connect(isp->otg->gadget);
 }

 static int isp1704_notifier_call(struct notifier_block *nb,
 		unsigned long event, void *unused)
 {
 	struct isp1704_charger *isp =
 		container_of(nb, struct isp1704_charger, nb);

 	switch (event) {
 	case USB_EVENT_VBUS:
 		schedule_work(&isp->work);
 		break;
 	case USB_EVENT_NONE:
 		if (isp->present) {
 			isp->present = 0;
 			power_supply_changed(&isp->psy);
 		}
 		break;
 	default:
 		return NOTIFY_DONE;
 	}

 	return NOTIFY_OK;
 }

 static int isp1704_charger_get_property(struct power_supply *psy,
 				enum power_supply_property psp,
 				union power_supply_propval *val)
 {
 	struct isp1704_charger *isp =
 		container_of(psy, struct isp1704_charger, psy);

 	switch (psp) {
 	case POWER_SUPPLY_PROP_PRESENT:
 		val->intval = isp->present;
 		break;
 	case POWER_SUPPLY_PROP_MODEL_NAME:
 		val->strval = isp->model;
 		break;
 	case POWER_SUPPLY_PROP_MANUFACTURER:
 		val->strval = "NXP";
 		break;
 	default:
 		return -EINVAL;
 	}
 	return 0;
 }

 static enum power_supply_property power_props[] = {
 	POWER_SUPPLY_PROP_PRESENT,
 	POWER_SUPPLY_PROP_MODEL_NAME,
 	POWER_SUPPLY_PROP_MANUFACTURER,
 };

 static inline int isp1704_test_ulpi(struct isp1704_charger *isp)
 {
 	int vendor;
 	int product;
 	int i;
 	int ret = -ENODEV;

 	/* Test ULPI interface */
 	ret = otg_io_write(isp->otg, ULPI_SCRATCH, 0xaa);
 	if (ret < 0)
 		return ret;

 	ret = otg_io_read(isp->otg, ULPI_SCRATCH);
 	if (ret < 0)
 		return ret;

 	if (ret != 0xaa)
 		return -ENODEV;

 	/* Verify the product and vendor id matches */
 	vendor = otg_io_read(isp->otg, ULPI_VENDOR_ID_LOW);
 	vendor |= otg_io_read(isp->otg, ULPI_VENDOR_ID_HIGH) << 8;
 	if (vendor != NXP_VENDOR_ID)
 		return -ENODEV;

 	product = otg_io_read(isp->otg, ULPI_PRODUCT_ID_LOW);
 	product |= otg_io_read(isp->otg, ULPI_PRODUCT_ID_HIGH) << 8;

 	for (i = 0; i < ARRAY_SIZE(isp170x_id); i++) {
 		if (product == isp170x_id[i]) {
 			sprintf(isp->model, "isp%x", product);
 			return product;
 		}
 	}

 	dev_err(isp->dev, "product id %x not matching known ids", product);

 	return -ENODEV;
 }

 static int __devinit isp1704_charger_probe(struct platform_device *pdev)
 {
 	struct isp1704_charger	*isp;
 	int			ret = -ENODEV;

 	isp = kzalloc(sizeof *isp, GFP_KERNEL);
 	if (!isp)
 		return -ENOMEM;

 	isp->otg = otg_get_transceiver();
 	if (!isp->otg)
 		goto fail0;

 	ret = isp1704_test_ulpi(isp);
 	if (ret < 0)
 		goto fail1;

 	isp->dev = &pdev->dev;
 	platform_set_drvdata(pdev, isp);

 	isp->psy.name		= "isp1704";
 	isp->psy.type		= POWER_SUPPLY_TYPE_USB;
 	isp->psy.properties	= power_props;
 	isp->psy.num_properties	= ARRAY_SIZE(power_props);
 	isp->psy.get_property	= isp1704_charger_get_property;

 	ret = power_supply_register(isp->dev, &isp->psy);
 	if (ret)
 		goto fail1;

 	/*
 	 * REVISIT: using work in order to allow the otg notifications to be
 	 * made atomically in the future.
 	 */
 	INIT_WORK(&isp->work, isp1704_charger_work);

 	isp->nb.notifier_call = isp1704_notifier_call;

 	ret = otg_register_notifier(isp->otg, &isp->nb);
 	if (ret)
 		goto fail2;

 	dev_info(isp->dev, "registered with product id %s\n", isp->model);

 	return 0;
 fail2:
 	power_supply_unregister(&isp->psy);
 fail1:
 	otg_put_transceiver(isp->otg);
 fail0:
 	kfree(isp);

 	dev_err(&pdev->dev, "failed to register isp1704 with error %d\n", ret);

 	return ret;
 }

 static int __devexit isp1704_charger_remove(struct platform_device *pdev)
 {
 	struct isp1704_charger *isp = platform_get_drvdata(pdev);

 	otg_unregister_notifier(isp->otg, &isp->nb);
 	power_supply_unregister(&isp->psy);
 	otg_put_transceiver(isp->otg);
 	kfree(isp);

 	return 0;
 }

 static struct platform_driver isp1704_charger_driver = {
 	.driver = {
 		.name = "isp1704_charger",
 	},
 	.probe = isp1704_charger_probe,
 	.remove = __devexit_p(isp1704_charger_remove),
 };

 static int __init isp1704_charger_init(void)
 {
 	return platform_driver_register(&isp1704_charger_driver);
 }
 module_init(isp1704_charger_init);

 static void __exit isp1704_charger_exit(void)
 {
 	platform_driver_unregister(&isp1704_charger_driver);
 }
 module_exit(isp1704_charger_exit);

 MODULE_ALIAS("platform:isp1704_charger");
 MODULE_AUTHOR("Nokia Corporation");
 MODULE_DESCRIPTION("ISP170x USB Charger driver");
 MODULE_LICENSE("GPL");
	/*
	* ISP1704 USB Charger Detection driver
	*
	* Copyright (C) 2010 Nokia Corporation
	*
	* 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.
	*
	* 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., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
	*/

	#include <linux/kernel.h>
	#include <linux/module.h>
	#include <linux/err.h>
	#include <linux/init.h>
	#include <linux/types.h>
	#include <linux/device.h>
	#include <linux/sysfs.h>
	#include <linux/platform_device.h>
	#include <linux/power_supply.h>
	#include <linux/delay.h>

	#include <linux/usb/otg.h>
	#include <linux/usb/ulpi.h>
	#include <linux/usb/ch9.h>
	#include <linux/usb/gadget.h>

	/* Vendor specific Power Control register */
	#define ISP1704_PWR_CTRL 0x3d
	#define ISP1704_PWR_CTRL_SWCTRL (1 << 0)
	#define ISP1704_PWR_CTRL_DET_COMP (1 << 1)
	#define ISP1704_PWR_CTRL_BVALID_RISE (1 << 2)
	#define ISP1704_PWR_CTRL_BVALID_FALL (1 << 3)
	#define ISP1704_PWR_CTRL_DP_WKPU_EN (1 << 4)
	#define ISP1704_PWR_CTRL_VDAT_DET (1 << 5)
	#define ISP1704_PWR_CTRL_DPVSRC_EN (1 << 6)
	#define ISP1704_PWR_CTRL_HWDETECT (1 << 7)

	#define NXP_VENDOR_ID 0x04cc

	static u16 isp170x_id[] = {
	0x1704,
	0x1707,
	};

	struct isp1704_charger {
	struct device *dev;
	struct power_supply psy;
	struct otg_transceiver *otg;
	struct notifier_block nb;
	struct work_struct work;

	char model[7];
	unsigned present:1;
	};

	/*
	* ISP1704 detects PS/2 adapters as charger. To make sure the detected charger
	* is actually a dedicated charger, the following steps need to be taken.
	*/
	static inline int isp1704_charger_verify(struct isp1704_charger *isp)
	{
	int ret = 0;
	u8 r;

	/* Reset the transceiver */
	r = otg_io_read(isp->otg, ULPI_FUNC_CTRL);
	r \|= ULPI_FUNC_CTRL_RESET;
	otg_io_write(isp->otg, ULPI_FUNC_CTRL, r);
	usleep_range(1000, 2000);

	/* Set normal mode */
	r &= ~(ULPI_FUNC_CTRL_RESET \| ULPI_FUNC_CTRL_OPMODE_MASK);
	otg_io_write(isp->otg, ULPI_FUNC_CTRL, r);

	/* Clear the DP and DM pull-down bits */
	r = ULPI_OTG_CTRL_DP_PULLDOWN \| ULPI_OTG_CTRL_DM_PULLDOWN;
	otg_io_write(isp->otg, ULPI_CLR(ULPI_OTG_CTRL), r);

	/* Enable strong pull-up on DP (1.5K) and reset */
	r = ULPI_FUNC_CTRL_TERMSELECT \| ULPI_FUNC_CTRL_RESET;
	otg_io_write(isp->otg, ULPI_SET(ULPI_FUNC_CTRL), r);
	usleep_range(1000, 2000);

	/* Read the line state */
	if (!otg_io_read(isp->otg, ULPI_DEBUG)) {
	/* Disable strong pull-up on DP (1.5K) */
	otg_io_write(isp->otg, ULPI_CLR(ULPI_FUNC_CTRL),
	ULPI_FUNC_CTRL_TERMSELECT);
	return 1;
	}

	/* Is it a charger or PS/2 connection */

	/* Enable weak pull-up resistor on DP */
	otg_io_write(isp->otg, ULPI_SET(ISP1704_PWR_CTRL),
	ISP1704_PWR_CTRL_DP_WKPU_EN);

	/* Disable strong pull-up on DP (1.5K) */
	otg_io_write(isp->otg, ULPI_CLR(ULPI_FUNC_CTRL),
	ULPI_FUNC_CTRL_TERMSELECT);

	/* Enable weak pull-down resistor on DM */
	otg_io_write(isp->otg, ULPI_SET(ULPI_OTG_CTRL),
	ULPI_OTG_CTRL_DM_PULLDOWN);

	/* It's a charger if the line states are clear */
	if (!(otg_io_read(isp->otg, ULPI_DEBUG)))
	ret = 1;

	/* Disable weak pull-up resistor on DP */
	otg_io_write(isp->otg, ULPI_CLR(ISP1704_PWR_CTRL),
	ISP1704_PWR_CTRL_DP_WKPU_EN);

	return ret;
	}

	static inline int isp1704_charger_detect(struct isp1704_charger *isp)
	{
	unsigned long timeout;
	u8 r;
	int ret = 0;

	/* set SW control bit in PWR_CTRL register */
	otg_io_write(isp->otg, ISP1704_PWR_CTRL,
	ISP1704_PWR_CTRL_SWCTRL);

	/* enable manual charger detection */
	r = (ISP1704_PWR_CTRL_SWCTRL \| ISP1704_PWR_CTRL_DPVSRC_EN);
	otg_io_write(isp->otg, ULPI_SET(ISP1704_PWR_CTRL), r);
	usleep_range(1000, 2000);

	timeout = jiffies + msecs_to_jiffies(300);
	do {
	/* Check if there is a charger */
	if (otg_io_read(isp->otg, ISP1704_PWR_CTRL)
	& ISP1704_PWR_CTRL_VDAT_DET) {
	ret = isp1704_charger_verify(isp);
	break;
	}
	} while (!time_after(jiffies, timeout));

	return ret;
	}

	static void isp1704_charger_work(struct work_struct *data)
	{
	int detect;
	struct isp1704_charger *isp =
	container_of(data, struct isp1704_charger, work);

	/*
	* FIXME Only supporting dedicated chargers even though isp1704 can
	* detect HUB and HOST chargers. If the device has already been
	* enumerated, the detection will break the connection.
	*/
	if (isp->otg->state != OTG_STATE_B_IDLE)
	return;

	/* disable data pullups */
	if (isp->otg->gadget)
	usb_gadget_disconnect(isp->otg->gadget);

	/* detect charger */
	detect = isp1704_charger_detect(isp);
	if (detect) {
	isp->present = detect;
	power_supply_changed(&isp->psy);
	}

	/* enable data pullups */
	if (isp->otg->gadget)
	usb_gadget_connect(isp->otg->gadget);
	}

	static int isp1704_notifier_call(struct notifier_block *nb,
	unsigned long event, void *unused)
	{
	struct isp1704_charger *isp =
	container_of(nb, struct isp1704_charger, nb);

	switch (event) {
	case USB_EVENT_VBUS:
	schedule_work(&isp->work);
	break;
	case USB_EVENT_NONE:
	if (isp->present) {
	isp->present = 0;
	power_supply_changed(&isp->psy);
	}
	break;
	default:
	return NOTIFY_DONE;
	}

	return NOTIFY_OK;
	}

	static int isp1704_charger_get_property(struct power_supply *psy,
	enum power_supply_property psp,
	union power_supply_propval *val)
	{
	struct isp1704_charger *isp =
	container_of(psy, struct isp1704_charger, psy);

	switch (psp) {
	case POWER_SUPPLY_PROP_PRESENT:
	val->intval = isp->present;
	break;
	case POWER_SUPPLY_PROP_MODEL_NAME:
	val->strval = isp->model;
	break;
	case POWER_SUPPLY_PROP_MANUFACTURER:
	val->strval = "NXP";
	break;
	default:
	return -EINVAL;
	}
	return 0;
	}

	static enum power_supply_property power_props[] = {
	POWER_SUPPLY_PROP_PRESENT,
	POWER_SUPPLY_PROP_MODEL_NAME,
	POWER_SUPPLY_PROP_MANUFACTURER,
	};

	static inline int isp1704_test_ulpi(struct isp1704_charger *isp)
	{
	int vendor;
	int product;
	int i;
	int ret = -ENODEV;

	/* Test ULPI interface */
	ret = otg_io_write(isp->otg, ULPI_SCRATCH, 0xaa);
	if (ret < 0)
	return ret;

	ret = otg_io_read(isp->otg, ULPI_SCRATCH);
	if (ret < 0)
	return ret;

	if (ret != 0xaa)
	return -ENODEV;

	/* Verify the product and vendor id matches */
	vendor = otg_io_read(isp->otg, ULPI_VENDOR_ID_LOW);
	vendor \|= otg_io_read(isp->otg, ULPI_VENDOR_ID_HIGH) << 8;
	if (vendor != NXP_VENDOR_ID)
	return -ENODEV;

	product = otg_io_read(isp->otg, ULPI_PRODUCT_ID_LOW);
	product \|= otg_io_read(isp->otg, ULPI_PRODUCT_ID_HIGH) << 8;

	for (i = 0; i < ARRAY_SIZE(isp170x_id); i++) {
	if (product == isp170x_id[i]) {
	sprintf(isp->model, "isp%x", product);
	return product;
	}
	}

	dev_err(isp->dev, "product id %x not matching known ids", product);

	return -ENODEV;
	}

	static int __devinit isp1704_charger_probe(struct platform_device *pdev)
	{
	struct isp1704_charger *isp;
	int ret = -ENODEV;

	isp = kzalloc(sizeof *isp, GFP_KERNEL);
	if (!isp)
	return -ENOMEM;

	isp->otg = otg_get_transceiver();
	if (!isp->otg)
	goto fail0;

	ret = isp1704_test_ulpi(isp);
	if (ret < 0)
	goto fail1;

	isp->dev = &pdev->dev;
	platform_set_drvdata(pdev, isp);

	isp->psy.name = "isp1704";
	isp->psy.type = POWER_SUPPLY_TYPE_USB;
	isp->psy.properties = power_props;
	isp->psy.num_properties = ARRAY_SIZE(power_props);
	isp->psy.get_property = isp1704_charger_get_property;

	ret = power_supply_register(isp->dev, &isp->psy);
	if (ret)
	goto fail1;

	/*
	* REVISIT: using work in order to allow the otg notifications to be
	* made atomically in the future.
	*/
	INIT_WORK(&isp->work, isp1704_charger_work);

	isp->nb.notifier_call = isp1704_notifier_call;

	ret = otg_register_notifier(isp->otg, &isp->nb);
	if (ret)
	goto fail2;

	dev_info(isp->dev, "registered with product id %s\n", isp->model);

	return 0;
	fail2:
	power_supply_unregister(&isp->psy);
	fail1:
	otg_put_transceiver(isp->otg);
	fail0:
	kfree(isp);

	dev_err(&pdev->dev, "failed to register isp1704 with error %d\n", ret);

	return ret;
	}

	static int __devexit isp1704_charger_remove(struct platform_device *pdev)
	{
	struct isp1704_charger *isp = platform_get_drvdata(pdev);

	otg_unregister_notifier(isp->otg, &isp->nb);
	power_supply_unregister(&isp->psy);
	otg_put_transceiver(isp->otg);
	kfree(isp);

	return 0;
	}

	static struct platform_driver isp1704_charger_driver = {
	.driver = {
	.name = "isp1704_charger",
	},
	.probe = isp1704_charger_probe,
	.remove = __devexit_p(isp1704_charger_remove),
	};

	static int __init isp1704_charger_init(void)
	{
	return platform_driver_register(&isp1704_charger_driver);
	}
	module_init(isp1704_charger_init);

	static void __exit isp1704_charger_exit(void)
	{
	platform_driver_unregister(&isp1704_charger_driver);
	}
	module_exit(isp1704_charger_exit);

	MODULE_ALIAS("platform:isp1704_charger");
	MODULE_AUTHOR("Nokia Corporation");
	MODULE_DESCRIPTION("ISP170x USB Charger driver");
	MODULE_LICENSE("GPL");