[linux-2.6-block.git] / drivers / power / isp1704_charger.c

/*
 * 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>
#include <linux/power/isp1704_charger.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;

	/* properties */
	char			model[8];
	unsigned		present:1;
	unsigned		online:1;
	unsigned		current_max;

	/* temp storage variables */
	unsigned long		event;
	unsigned		max_power;
};

/*
 * Disable/enable the power from the isp1704 if a function for it
 * has been provided with platform data.
 */
static void isp1704_charger_set_power(struct isp1704_charger *isp, bool on)
{
	struct isp1704_charger_data	*board = isp->dev->platform_data;

	if (board->set_power)
		board->set_power(on);
}

/*
 * Determine is the charging port DCP (dedicated charger) or CDP (Host/HUB
 * chargers).
 *
 * REVISIT: The method is defined in Battery Charging Specification and is
 * applicable to any ULPI transceiver. Nothing isp170x specific here.
 */
static inline int isp1704_charger_type(struct isp1704_charger *isp)
{
	u8 reg;
	u8 func_ctrl;
	u8 otg_ctrl;
	int type = POWER_SUPPLY_TYPE_USB_DCP;

	func_ctrl = otg_io_read(isp->otg, ULPI_FUNC_CTRL);
	otg_ctrl = otg_io_read(isp->otg, ULPI_OTG_CTRL);

	/* disable pulldowns */
	reg = ULPI_OTG_CTRL_DM_PULLDOWN | ULPI_OTG_CTRL_DP_PULLDOWN;
	otg_io_write(isp->otg, ULPI_CLR(ULPI_OTG_CTRL), reg);

	/* full speed */
	otg_io_write(isp->otg, ULPI_CLR(ULPI_FUNC_CTRL),
			ULPI_FUNC_CTRL_XCVRSEL_MASK);
	otg_io_write(isp->otg, ULPI_SET(ULPI_FUNC_CTRL),
			ULPI_FUNC_CTRL_FULL_SPEED);

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

	reg = otg_io_read(isp->otg, ULPI_DEBUG);
	if ((reg & 3) != 3)
		type = POWER_SUPPLY_TYPE_USB_CDP;

	/* recover original state */
	otg_io_write(isp->otg, ULPI_FUNC_CTRL, func_ctrl);
	otg_io_write(isp->otg, ULPI_OTG_CTRL, otg_ctrl);

	return type;
}

/*
 * 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		pwr_ctrl;
	int		ret = 0;

	pwr_ctrl = otg_io_read(isp->otg, ISP1704_PWR_CTRL);

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

	/* enable manual charger detection */
	otg_io_write(isp->otg, ULPI_SET(ISP1704_PWR_CTRL),
			ISP1704_PWR_CTRL_SWCTRL
			| ISP1704_PWR_CTRL_DPVSRC_EN);
	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) && isp->online);

	/* recover original state */
	otg_io_write(isp->otg, ISP1704_PWR_CTRL, pwr_ctrl);

	return ret;
}

static void isp1704_charger_work(struct work_struct *data)
{
	int			detect;
	unsigned long		event;
	unsigned		power;
	struct isp1704_charger	*isp =
		container_of(data, struct isp1704_charger, work);
	static DEFINE_MUTEX(lock);

	event = isp->event;
	power = isp->max_power;

	mutex_lock(&lock);

	if (event != USB_EVENT_NONE)
		isp1704_charger_set_power(isp, 1);

	switch (event) {
	case USB_EVENT_VBUS:
		isp->online = true;

		/* detect charger */
		detect = isp1704_charger_detect(isp);

		if (detect) {
			isp->present = detect;
			isp->psy.type = isp1704_charger_type(isp);
		}

		switch (isp->psy.type) {
		case POWER_SUPPLY_TYPE_USB_DCP:
			isp->current_max = 1800;
			break;
		case POWER_SUPPLY_TYPE_USB_CDP:
			/*
			 * Only 500mA here or high speed chirp
			 * handshaking may break
			 */
			isp->current_max = 500;
			/* FALLTHROUGH */
		case POWER_SUPPLY_TYPE_USB:
		default:
			/* enable data pullups */
			if (isp->otg->gadget)
				usb_gadget_connect(isp->otg->gadget);
		}
		break;
	case USB_EVENT_NONE:
		isp->online = false;
		isp->current_max = 0;
		isp->present = 0;
		isp->current_max = 0;
		isp->psy.type = POWER_SUPPLY_TYPE_USB;

		/*
		 * Disable data pullups. We need to prevent the controller from
		 * enumerating.
		 *
		 * FIXME: This is here to allow charger detection with Host/HUB
		 * chargers. The pullups may be enabled elsewhere, so this can
		 * not be the final solution.
		 */
		if (isp->otg->gadget)
			usb_gadget_disconnect(isp->otg->gadget);

		isp1704_charger_set_power(isp, 0);
		break;
	case USB_EVENT_ENUMERATED:
		if (isp->present)
			isp->current_max = 1800;
		else
			isp->current_max = power;
		break;
	default:
		goto out;
	}

	power_supply_changed(&isp->psy);
out:
	mutex_unlock(&lock);
}

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

	isp->event = event;

	if (power)
		isp->max_power = *((unsigned *)power);

	schedule_work(&isp->work);

	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_ONLINE:
		val->intval = isp->online;
		break;
	case POWER_SUPPLY_PROP_CURRENT_MAX:
		val->intval = isp->current_max;
		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_ONLINE,
	POWER_SUPPLY_PROP_CURRENT_MAX,
	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;

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

	isp1704_charger_set_power(isp, 1);

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

	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);

	/*
	 * Taking over the D+ pullup.
	 *
	 * FIXME: The device will be disconnected if it was already
	 * enumerated. The charger driver should be always loaded before any
	 * gadget is loaded.
	 */
	if (isp->otg->gadget)
		usb_gadget_disconnect(isp->otg->gadget);

	/* Detect charger if VBUS is valid (the cable was already plugged). */
	ret = otg_io_read(isp->otg, ULPI_USB_INT_STS);
	isp1704_charger_set_power(isp, 0);
	if ((ret & ULPI_INT_VBUS_VALID) && !isp->otg->default_a) {
		isp->event = USB_EVENT_VBUS;
		schedule_work(&isp->work);
	}

	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);
	isp1704_charger_set_power(isp, 0);
	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");
Commit	Line	Data
ec46475f HK	1	/*
	2	* ISP1704 USB Charger Detection driver
	3	*
	4	* Copyright (C) 2010 Nokia Corporation
	5	*
	6	* This program is free software; you can redistribute it and/or modify
	7	* it under the terms of the GNU General Public License as published by
	8	* the Free Software Foundation; either version 2 of the License, or
	9	* (at your option) any later version.
	10	*
	11	* This program is distributed in the hope that it will be useful,
	12	* but WITHOUT ANY WARRANTY; without even the implied warranty of
	13	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	14	* GNU General Public License for more details.
	15	*
	16	* You should have received a copy of the GNU General Public License
	17	* along with this program; if not, write to the Free Software
	18	* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
	19	*/
	20
	21	#include <linux/kernel.h>
	22	#include <linux/module.h>
	23	#include <linux/err.h>
	24	#include <linux/init.h>
	25	#include <linux/types.h>
	26	#include <linux/device.h>
	27	#include <linux/sysfs.h>
	28	#include <linux/platform_device.h>
	29	#include <linux/power_supply.h>
	30	#include <linux/delay.h>
	31
	32	#include <linux/usb/otg.h>
	33	#include <linux/usb/ulpi.h>
	34	#include <linux/usb/ch9.h>
	35	#include <linux/usb/gadget.h>
2785cefc	36	#include <linux/power/isp1704_charger.h>
ec46475f HK	37
	38	/* Vendor specific Power Control register */
	39	#define ISP1704_PWR_CTRL 0x3d
	40	#define ISP1704_PWR_CTRL_SWCTRL (1 << 0)
	41	#define ISP1704_PWR_CTRL_DET_COMP (1 << 1)
	42	#define ISP1704_PWR_CTRL_BVALID_RISE (1 << 2)
	43	#define ISP1704_PWR_CTRL_BVALID_FALL (1 << 3)
	44	#define ISP1704_PWR_CTRL_DP_WKPU_EN (1 << 4)
	45	#define ISP1704_PWR_CTRL_VDAT_DET (1 << 5)
	46	#define ISP1704_PWR_CTRL_DPVSRC_EN (1 << 6)
	47	#define ISP1704_PWR_CTRL_HWDETECT (1 << 7)
	48
	49	#define NXP_VENDOR_ID 0x04cc
	50
	51	static u16 isp170x_id[] = {
	52	0x1704,
	53	0x1707,
	54	};
	55
	56	struct isp1704_charger {
	57	struct device *dev;
	58	struct power_supply psy;
	59	struct otg_transceiver *otg;
	60	struct notifier_block nb;
	61	struct work_struct work;
	62
bac43b20	63	/* properties */
746d8fb8	64	char model[8];
ec46475f	65	unsigned present:1;
bac43b20 HK	66	unsigned online:1;
	67	unsigned current_max;
	68
	69	/* temp storage variables */
	70	unsigned long event;
	71	unsigned max_power;
ec46475f HK	72	};
ec46475f HK	73
2785cefc KJ	74	/*
	75	* Disable/enable the power from the isp1704 if a function for it
	76	* has been provided with platform data.
	77	*/
	78	static void isp1704_charger_set_power(struct isp1704_charger *isp, bool on)
	79	{
	80	struct isp1704_charger_data *board = isp->dev->platform_data;
	81
	82	if (board->set_power)
	83	board->set_power(on);
	84	}
	85
bac43b20 HK	86	/*
	87	* Determine is the charging port DCP (dedicated charger) or CDP (Host/HUB
	88	* chargers).
	89	*
	90	* REVISIT: The method is defined in Battery Charging Specification and is
	91	* applicable to any ULPI transceiver. Nothing isp170x specific here.
	92	*/
	93	static inline int isp1704_charger_type(struct isp1704_charger *isp)
	94	{
	95	u8 reg;
	96	u8 func_ctrl;
	97	u8 otg_ctrl;
	98	int type = POWER_SUPPLY_TYPE_USB_DCP;
	99
	100	func_ctrl = otg_io_read(isp->otg, ULPI_FUNC_CTRL);
	101	otg_ctrl = otg_io_read(isp->otg, ULPI_OTG_CTRL);
	102
	103	/* disable pulldowns */
	104	reg = ULPI_OTG_CTRL_DM_PULLDOWN \| ULPI_OTG_CTRL_DP_PULLDOWN;
	105	otg_io_write(isp->otg, ULPI_CLR(ULPI_OTG_CTRL), reg);
	106
	107	/* full speed */
	108	otg_io_write(isp->otg, ULPI_CLR(ULPI_FUNC_CTRL),
	109	ULPI_FUNC_CTRL_XCVRSEL_MASK);
	110	otg_io_write(isp->otg, ULPI_SET(ULPI_FUNC_CTRL),
	111	ULPI_FUNC_CTRL_FULL_SPEED);
	112
	113	/* Enable strong pull-up on DP (1.5K) and reset */
	114	reg = ULPI_FUNC_CTRL_TERMSELECT \| ULPI_FUNC_CTRL_RESET;
	115	otg_io_write(isp->otg, ULPI_SET(ULPI_FUNC_CTRL), reg);
	116	usleep_range(1000, 2000);
	117
	118	reg = otg_io_read(isp->otg, ULPI_DEBUG);
	119	if ((reg & 3) != 3)
	120	type = POWER_SUPPLY_TYPE_USB_CDP;
	121
	122	/* recover original state */
	123	otg_io_write(isp->otg, ULPI_FUNC_CTRL, func_ctrl);
	124	otg_io_write(isp->otg, ULPI_OTG_CTRL, otg_ctrl);
	125
	126	return type;
	127	}
	128
ec46475f HK	129	/*
	130	* ISP1704 detects PS/2 adapters as charger. To make sure the detected charger
	131	* is actually a dedicated charger, the following steps need to be taken.
	132	*/
	133	static inline int isp1704_charger_verify(struct isp1704_charger *isp)
	134	{
	135	int ret = 0;
	136	u8 r;
	137
	138	/* Reset the transceiver */
	139	r = otg_io_read(isp->otg, ULPI_FUNC_CTRL);
	140	r \|= ULPI_FUNC_CTRL_RESET;
	141	otg_io_write(isp->otg, ULPI_FUNC_CTRL, r);
	142	usleep_range(1000, 2000);
	143
	144	/* Set normal mode */
	145	r &= ~(ULPI_FUNC_CTRL_RESET \| ULPI_FUNC_CTRL_OPMODE_MASK);
	146	otg_io_write(isp->otg, ULPI_FUNC_CTRL, r);
	147
	148	/* Clear the DP and DM pull-down bits */
	149	r = ULPI_OTG_CTRL_DP_PULLDOWN \| ULPI_OTG_CTRL_DM_PULLDOWN;
	150	otg_io_write(isp->otg, ULPI_CLR(ULPI_OTG_CTRL), r);
	151
	152	/* Enable strong pull-up on DP (1.5K) and reset */
	153	r = ULPI_FUNC_CTRL_TERMSELECT \| ULPI_FUNC_CTRL_RESET;
	154	otg_io_write(isp->otg, ULPI_SET(ULPI_FUNC_CTRL), r);
	155	usleep_range(1000, 2000);
	156
	157	/* Read the line state */
	158	if (!otg_io_read(isp->otg, ULPI_DEBUG)) {
	159	/* Disable strong pull-up on DP (1.5K) */
	160	otg_io_write(isp->otg, ULPI_CLR(ULPI_FUNC_CTRL),
	161	ULPI_FUNC_CTRL_TERMSELECT);
	162	return 1;
	163	}
	164
	165	/* Is it a charger or PS/2 connection */
	166
	167	/* Enable weak pull-up resistor on DP */
	168	otg_io_write(isp->otg, ULPI_SET(ISP1704_PWR_CTRL),
	169	ISP1704_PWR_CTRL_DP_WKPU_EN);
	170
	171	/* Disable strong pull-up on DP (1.5K) */
	172	otg_io_write(isp->otg, ULPI_CLR(ULPI_FUNC_CTRL),
	173	ULPI_FUNC_CTRL_TERMSELECT);
	174
	175	/* Enable weak pull-down resistor on DM */
	176	otg_io_write(isp->otg, ULPI_SET(ULPI_OTG_CTRL),
	177	ULPI_OTG_CTRL_DM_PULLDOWN);
	178
	179	/* It's a charger if the line states are clear */
	180	if (!(otg_io_read(isp->otg, ULPI_DEBUG)))
	181	ret = 1;
	182
	183	/* Disable weak pull-up resistor on DP */
	184	otg_io_write(isp->otg, ULPI_CLR(ISP1704_PWR_CTRL),
	185	ISP1704_PWR_CTRL_DP_WKPU_EN);
	186
	187	return ret;
	188	}
	189
	190	static inline int isp1704_charger_detect(struct isp1704_charger *isp)
	191	{
	192	unsigned long timeout;
bac43b20	193	u8 pwr_ctrl;
ec46475f HK	194	int ret = 0;
ec46475f HK	195
bac43b20 HK	196	pwr_ctrl = otg_io_read(isp->otg, ISP1704_PWR_CTRL);
bac43b20 HK	197
ec46475f HK	198	/* set SW control bit in PWR_CTRL register */
	199	otg_io_write(isp->otg, ISP1704_PWR_CTRL,
	200	ISP1704_PWR_CTRL_SWCTRL);
	201
	202	/* enable manual charger detection */
bac43b20 HK	203	otg_io_write(isp->otg, ULPI_SET(ISP1704_PWR_CTRL),
	204	ISP1704_PWR_CTRL_SWCTRL
	205	\| ISP1704_PWR_CTRL_DPVSRC_EN);
ec46475f HK	206	usleep_range(1000, 2000);
	207
	208	timeout = jiffies + msecs_to_jiffies(300);
	209	do {
	210	/* Check if there is a charger */
	211	if (otg_io_read(isp->otg, ISP1704_PWR_CTRL)
	212	& ISP1704_PWR_CTRL_VDAT_DET) {
	213	ret = isp1704_charger_verify(isp);
	214	break;
	215	}
bac43b20 HK	216	} while (!time_after(jiffies, timeout) && isp->online);
	217
	218	/* recover original state */
	219	otg_io_write(isp->otg, ISP1704_PWR_CTRL, pwr_ctrl);
ec46475f HK	220
	221	return ret;
	222	}
	223
	224	static void isp1704_charger_work(struct work_struct *data)
	225	{
	226	int detect;
bac43b20 HK	227	unsigned long event;
bac43b20 HK	228	unsigned power;
ec46475f HK	229	struct isp1704_charger *isp =
ec46475f HK	230	container_of(data, struct isp1704_charger, work);
bac43b20	231	static DEFINE_MUTEX(lock);
ec46475f	232
bac43b20 HK	233	event = isp->event;
bac43b20 HK	234	power = isp->max_power;
ec46475f	235
bac43b20	236	mutex_lock(&lock);
ec46475f	237
2785cefc KJ	238	if (event != USB_EVENT_NONE)
	239	isp1704_charger_set_power(isp, 1);
	240
ec46475f HK	241	switch (event) {
ec46475f HK	242	case USB_EVENT_VBUS:
bac43b20 HK	243	isp->online = true;
	244
	245	/* detect charger */
	246	detect = isp1704_charger_detect(isp);
	247
	248	if (detect) {
	249	isp->present = detect;
	250	isp->psy.type = isp1704_charger_type(isp);
	251	}
	252
	253	switch (isp->psy.type) {
	254	case POWER_SUPPLY_TYPE_USB_DCP:
	255	isp->current_max = 1800;
	256	break;
	257	case POWER_SUPPLY_TYPE_USB_CDP:
	258	/*
	259	* Only 500mA here or high speed chirp
	260	* handshaking may break
	261	*/
	262	isp->current_max = 500;
	263	/* FALLTHROUGH */
	264	case POWER_SUPPLY_TYPE_USB:
	265	default:
	266	/* enable data pullups */
	267	if (isp->otg->gadget)
	268	usb_gadget_connect(isp->otg->gadget);
	269	}
ec46475f HK	270	break;
ec46475f HK	271	case USB_EVENT_NONE:
bac43b20 HK	272	isp->online = false;
	273	isp->current_max = 0;
	274	isp->present = 0;
	275	isp->current_max = 0;
	276	isp->psy.type = POWER_SUPPLY_TYPE_USB;
	277
	278	/*
	279	* Disable data pullups. We need to prevent the controller from
	280	* enumerating.
	281	*
	282	* FIXME: This is here to allow charger detection with Host/HUB
	283	* chargers. The pullups may be enabled elsewhere, so this can
	284	* not be the final solution.
	285	*/
	286	if (isp->otg->gadget)
	287	usb_gadget_disconnect(isp->otg->gadget);
2785cefc KJ	288
2785cefc KJ	289	isp1704_charger_set_power(isp, 0);
bac43b20 HK	290	break;
	291	case USB_EVENT_ENUMERATED:
	292	if (isp->present)
	293	isp->current_max = 1800;
	294	else
	295	isp->current_max = power;
ec46475f HK	296	break;
ec46475f HK	297	default:
bac43b20	298	goto out;
ec46475f HK	299	}
ec46475f HK	300
bac43b20 HK	301	power_supply_changed(&isp->psy);
	302	out:
	303	mutex_unlock(&lock);
	304	}
	305
	306	static int isp1704_notifier_call(struct notifier_block *nb,
	307	unsigned long event, void *power)
	308	{
	309	struct isp1704_charger *isp =
	310	container_of(nb, struct isp1704_charger, nb);
	311
	312	isp->event = event;
	313
	314	if (power)
	315	isp->max_power = ((unsigned )power);
	316
	317	schedule_work(&isp->work);
	318
ec46475f HK	319	return NOTIFY_OK;
	320	}
	321
	322	static int isp1704_charger_get_property(struct power_supply *psy,
	323	enum power_supply_property psp,
	324	union power_supply_propval *val)
	325	{
	326	struct isp1704_charger *isp =
	327	container_of(psy, struct isp1704_charger, psy);
	328
	329	switch (psp) {
	330	case POWER_SUPPLY_PROP_PRESENT:
	331	val->intval = isp->present;
	332	break;
bac43b20 HK	333	case POWER_SUPPLY_PROP_ONLINE:
	334	val->intval = isp->online;
	335	break;
	336	case POWER_SUPPLY_PROP_CURRENT_MAX:
	337	val->intval = isp->current_max;
	338	break;
ec46475f HK	339	case POWER_SUPPLY_PROP_MODEL_NAME:
	340	val->strval = isp->model;
	341	break;
	342	case POWER_SUPPLY_PROP_MANUFACTURER:
	343	val->strval = "NXP";
	344	break;
	345	default:
	346	return -EINVAL;
	347	}
	348	return 0;
	349	}
	350
	351	static enum power_supply_property power_props[] = {
	352	POWER_SUPPLY_PROP_PRESENT,
bac43b20 HK	353	POWER_SUPPLY_PROP_ONLINE,
bac43b20 HK	354	POWER_SUPPLY_PROP_CURRENT_MAX,
ec46475f HK	355	POWER_SUPPLY_PROP_MODEL_NAME,
	356	POWER_SUPPLY_PROP_MANUFACTURER,
	357	};
	358
	359	static inline int isp1704_test_ulpi(struct isp1704_charger *isp)
	360	{
	361	int vendor;
	362	int product;
	363	int i;
	364	int ret = -ENODEV;
	365
	366	/* Test ULPI interface */
	367	ret = otg_io_write(isp->otg, ULPI_SCRATCH, 0xaa);
	368	if (ret < 0)
	369	return ret;
	370
	371	ret = otg_io_read(isp->otg, ULPI_SCRATCH);
	372	if (ret < 0)
	373	return ret;
	374
	375	if (ret != 0xaa)
	376	return -ENODEV;
	377
	378	/* Verify the product and vendor id matches */
	379	vendor = otg_io_read(isp->otg, ULPI_VENDOR_ID_LOW);
	380	vendor \|= otg_io_read(isp->otg, ULPI_VENDOR_ID_HIGH) << 8;
	381	if (vendor != NXP_VENDOR_ID)
	382	return -ENODEV;
	383
	384	product = otg_io_read(isp->otg, ULPI_PRODUCT_ID_LOW);
	385	product \|= otg_io_read(isp->otg, ULPI_PRODUCT_ID_HIGH) << 8;
	386
	387	for (i = 0; i < ARRAY_SIZE(isp170x_id); i++) {
	388	if (product == isp170x_id[i]) {
	389	sprintf(isp->model, "isp%x", product);
	390	return product;
	391	}
	392	}
	393
	394	dev_err(isp->dev, "product id %x not matching known ids", product);
	395
	396	return -ENODEV;
	397	}
	398
	399	static int __devinit isp1704_charger_probe(struct platform_device *pdev)
	400	{
	401	struct isp1704_charger *isp;
	402	int ret = -ENODEV;
	403
	404	isp = kzalloc(sizeof *isp, GFP_KERNEL);
	405	if (!isp)
	406	return -ENOMEM;
	407
	408	isp->otg = otg_get_transceiver();
	409	if (!isp->otg)
	410	goto fail0;
	411
a4607d9f HK	412	isp->dev = &pdev->dev;
	413	platform_set_drvdata(pdev, isp);
	414
2785cefc KJ	415	isp1704_charger_set_power(isp, 1);
2785cefc KJ	416
ec46475f HK	417	ret = isp1704_test_ulpi(isp);
	418	if (ret < 0)
	419	goto fail1;
	420
ec46475f HK	421	isp->psy.name = "isp1704";
	422	isp->psy.type = POWER_SUPPLY_TYPE_USB;
	423	isp->psy.properties = power_props;
	424	isp->psy.num_properties = ARRAY_SIZE(power_props);
	425	isp->psy.get_property = isp1704_charger_get_property;
	426
	427	ret = power_supply_register(isp->dev, &isp->psy);
	428	if (ret)
	429	goto fail1;
	430
	431	/*
	432	* REVISIT: using work in order to allow the otg notifications to be
	433	* made atomically in the future.
	434	*/
	435	INIT_WORK(&isp->work, isp1704_charger_work);
	436
	437	isp->nb.notifier_call = isp1704_notifier_call;
	438
	439	ret = otg_register_notifier(isp->otg, &isp->nb);
	440	if (ret)
	441	goto fail2;
	442
	443	dev_info(isp->dev, "registered with product id %s\n", isp->model);
	444
e1a85694 HK	445	/*
	446	* Taking over the D+ pullup.
	447	*
	448	* FIXME: The device will be disconnected if it was already
	449	* enumerated. The charger driver should be always loaded before any
	450	* gadget is loaded.
	451	*/
	452	if (isp->otg->gadget)
	453	usb_gadget_disconnect(isp->otg->gadget);
	454
	455	/* Detect charger if VBUS is valid (the cable was already plugged). */
	456	ret = otg_io_read(isp->otg, ULPI_USB_INT_STS);
2785cefc	457	isp1704_charger_set_power(isp, 0);
e1a85694 HK	458	if ((ret & ULPI_INT_VBUS_VALID) && !isp->otg->default_a) {
	459	isp->event = USB_EVENT_VBUS;
	460	schedule_work(&isp->work);
	461	}
	462
ec46475f HK	463	return 0;
	464	fail2:
	465	power_supply_unregister(&isp->psy);
	466	fail1:
	467	otg_put_transceiver(isp->otg);
	468	fail0:
	469	kfree(isp);
	470
	471	dev_err(&pdev->dev, "failed to register isp1704 with error %d\n", ret);
	472
	473	return ret;
	474	}
	475
	476	static int __devexit isp1704_charger_remove(struct platform_device *pdev)
	477	{
	478	struct isp1704_charger *isp = platform_get_drvdata(pdev);
	479
	480	otg_unregister_notifier(isp->otg, &isp->nb);
	481	power_supply_unregister(&isp->psy);
	482	otg_put_transceiver(isp->otg);
2785cefc	483	isp1704_charger_set_power(isp, 0);
ec46475f HK	484	kfree(isp);
	485
	486	return 0;
	487	}
	488
	489	static struct platform_driver isp1704_charger_driver = {
	490	.driver = {
	491	.name = "isp1704_charger",
	492	},
	493	.probe = isp1704_charger_probe,
	494	.remove = __devexit_p(isp1704_charger_remove),
	495	};
	496
	497	static int __init isp1704_charger_init(void)
	498	{
	499	return platform_driver_register(&isp1704_charger_driver);
	500	}
	501	module_init(isp1704_charger_init);
	502
	503	static void __exit isp1704_charger_exit(void)
	504	{
	505	platform_driver_unregister(&isp1704_charger_driver);
	506	}
	507	module_exit(isp1704_charger_exit);
	508
	509	MODULE_ALIAS("platform:isp1704_charger");
	510	MODULE_AUTHOR("Nokia Corporation");
	511	MODULE_DESCRIPTION("ISP170x USB Charger driver");
	512	MODULE_LICENSE("GPL");