[GitHub/mt8127/android_kernel_alcatel_ttab.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 usb_phy		*phy;
	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;
};

static inline int isp1704_read(struct isp1704_charger *isp, u32 reg)
{
	return usb_phy_io_read(isp->phy, reg);
}

static inline int isp1704_write(struct isp1704_charger *isp, u32 val, u32 reg)
{
	return usb_phy_io_write(isp->phy, val, reg);
}

/*
 * 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 && 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 = isp1704_read(isp, ULPI_FUNC_CTRL);
	otg_ctrl = isp1704_read(isp, ULPI_OTG_CTRL);

	/* disable pulldowns */
	reg = ULPI_OTG_CTRL_DM_PULLDOWN | ULPI_OTG_CTRL_DP_PULLDOWN;
	isp1704_write(isp, ULPI_CLR(ULPI_OTG_CTRL), reg);

	/* full speed */
	isp1704_write(isp, ULPI_CLR(ULPI_FUNC_CTRL),
			ULPI_FUNC_CTRL_XCVRSEL_MASK);
	isp1704_write(isp, 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;
	isp1704_write(isp, ULPI_SET(ULPI_FUNC_CTRL), reg);
	usleep_range(1000, 2000);

	reg = isp1704_read(isp, ULPI_DEBUG);
	if ((reg & 3) != 3)
		type = POWER_SUPPLY_TYPE_USB_CDP;

	/* recover original state */
	isp1704_write(isp, ULPI_FUNC_CTRL, func_ctrl);
	isp1704_write(isp, 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 = isp1704_read(isp, ULPI_FUNC_CTRL);
	r |= ULPI_FUNC_CTRL_RESET;
	isp1704_write(isp, ULPI_FUNC_CTRL, r);
	usleep_range(1000, 2000);

	/* Set normal mode */
	r &= ~(ULPI_FUNC_CTRL_RESET | ULPI_FUNC_CTRL_OPMODE_MASK);
	isp1704_write(isp, ULPI_FUNC_CTRL, r);

	/* Clear the DP and DM pull-down bits */
	r = ULPI_OTG_CTRL_DP_PULLDOWN | ULPI_OTG_CTRL_DM_PULLDOWN;
	isp1704_write(isp, 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;
	isp1704_write(isp, ULPI_SET(ULPI_FUNC_CTRL), r);
	usleep_range(1000, 2000);

	/* Read the line state */
	if (!isp1704_read(isp, ULPI_DEBUG)) {
		/* Disable strong pull-up on DP (1.5K) */
		isp1704_write(isp, 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 */
	isp1704_write(isp, ULPI_SET(ISP1704_PWR_CTRL),
			ISP1704_PWR_CTRL_DP_WKPU_EN);

	/* Disable strong pull-up on DP (1.5K) */
	isp1704_write(isp, ULPI_CLR(ULPI_FUNC_CTRL),
			ULPI_FUNC_CTRL_TERMSELECT);

	/* Enable weak pull-down resistor on DM */
	isp1704_write(isp, ULPI_SET(ULPI_OTG_CTRL),
			ULPI_OTG_CTRL_DM_PULLDOWN);

	/* It's a charger if the line states are clear */
	if (!(isp1704_read(isp, ULPI_DEBUG)))
		ret = 1;

	/* Disable weak pull-up resistor on DP */
	isp1704_write(isp, 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 = isp1704_read(isp, ISP1704_PWR_CTRL);

	/* set SW control bit in PWR_CTRL register */
	isp1704_write(isp, ISP1704_PWR_CTRL,
			ISP1704_PWR_CTRL_SWCTRL);

	/* enable manual charger detection */
	isp1704_write(isp, 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 (isp1704_read(isp, ISP1704_PWR_CTRL)
				& ISP1704_PWR_CTRL_VDAT_DET) {
			ret = isp1704_charger_verify(isp);
			break;
		}
	} while (!time_after(jiffies, timeout) && isp->online);

	/* recover original state */
	isp1704_write(isp, 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->phy->otg->gadget)
				usb_gadget_connect(isp->phy->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->phy->otg->gadget)
			usb_gadget_disconnect(isp->phy->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 = isp1704_write(isp, ULPI_SCRATCH, 0xaa);
	if (ret < 0)
		return ret;

	ret = isp1704_read(isp, ULPI_SCRATCH);
	if (ret < 0)
		return ret;

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

	/* Verify the product and vendor id matches */
	vendor = isp1704_read(isp, ULPI_VENDOR_ID_LOW);
	vendor |= isp1704_read(isp, ULPI_VENDOR_ID_HIGH) << 8;
	if (vendor != NXP_VENDOR_ID)
		return -ENODEV;

	product = isp1704_read(isp, ULPI_PRODUCT_ID_LOW);
	product |= isp1704_read(isp, 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 isp1704_charger_probe(struct platform_device *pdev)
{
	struct isp1704_charger	*isp;
	int			ret = -ENODEV;

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

	isp->phy = usb_get_phy(USB_PHY_TYPE_USB2);
	if (IS_ERR_OR_NULL(isp->phy))
		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 usb notifications to be
	 * made atomically in the future.
	 */
	INIT_WORK(&isp->work, isp1704_charger_work);

	isp->nb.notifier_call = isp1704_notifier_call;

	ret = usb_register_notifier(isp->phy, &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->phy->otg->gadget)
		usb_gadget_disconnect(isp->phy->otg->gadget);

	/* Detect charger if VBUS is valid (the cable was already plugged). */
	ret = isp1704_read(isp, ULPI_USB_INT_STS);
	isp1704_charger_set_power(isp, 0);
	if ((ret & ULPI_INT_VBUS_VALID) && !isp->phy->otg->default_a) {
		isp->event = USB_EVENT_VBUS;
		schedule_work(&isp->work);
	}

	return 0;
fail2:
	power_supply_unregister(&isp->psy);
fail1:
	isp1704_charger_set_power(isp, 0);
	usb_put_phy(isp->phy);
fail0:
	dev_err(&pdev->dev, "failed to register isp1704 with error %d\n", ret);

	return ret;
}

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

	usb_unregister_notifier(isp->phy, &isp->nb);
	power_supply_unregister(&isp->psy);
	usb_put_phy(isp->phy);
	isp1704_charger_set_power(isp, 0);

	return 0;
}

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

module_platform_driver(isp1704_charger_driver);

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;
fcc8ebc9	59	struct usb_phy *phy;
ec46475f HK	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
fcc8ebc9 HK	74	static inline int isp1704_read(struct isp1704_charger *isp, u32 reg)
	75	{
	76	return usb_phy_io_read(isp->phy, reg);
	77	}
	78
	79	static inline int isp1704_write(struct isp1704_charger *isp, u32 val, u32 reg)
	80	{
	81	return usb_phy_io_write(isp->phy, val, reg);
	82	}
	83
2785cefc KJ	84	/*
	85	* Disable/enable the power from the isp1704 if a function for it
	86	* has been provided with platform data.
	87	*/
	88	static void isp1704_charger_set_power(struct isp1704_charger *isp, bool on)
	89	{
	90	struct isp1704_charger_data *board = isp->dev->platform_data;
	91
c934502d	92	if (board && board->set_power)
2785cefc KJ	93	board->set_power(on);
	94	}
	95
bac43b20 HK	96	/*
	97	* Determine is the charging port DCP (dedicated charger) or CDP (Host/HUB
	98	* chargers).
	99	*
	100	* REVISIT: The method is defined in Battery Charging Specification and is
	101	* applicable to any ULPI transceiver. Nothing isp170x specific here.
	102	*/
	103	static inline int isp1704_charger_type(struct isp1704_charger *isp)
	104	{
	105	u8 reg;
	106	u8 func_ctrl;
	107	u8 otg_ctrl;
	108	int type = POWER_SUPPLY_TYPE_USB_DCP;
	109
fcc8ebc9 HK	110	func_ctrl = isp1704_read(isp, ULPI_FUNC_CTRL);
fcc8ebc9 HK	111	otg_ctrl = isp1704_read(isp, ULPI_OTG_CTRL);
bac43b20 HK	112
	113	/* disable pulldowns */
	114	reg = ULPI_OTG_CTRL_DM_PULLDOWN \| ULPI_OTG_CTRL_DP_PULLDOWN;
fcc8ebc9	115	isp1704_write(isp, ULPI_CLR(ULPI_OTG_CTRL), reg);
bac43b20 HK	116
bac43b20 HK	117	/* full speed */
fcc8ebc9	118	isp1704_write(isp, ULPI_CLR(ULPI_FUNC_CTRL),
bac43b20	119	ULPI_FUNC_CTRL_XCVRSEL_MASK);
fcc8ebc9	120	isp1704_write(isp, ULPI_SET(ULPI_FUNC_CTRL),
bac43b20 HK	121	ULPI_FUNC_CTRL_FULL_SPEED);
	122
	123	/* Enable strong pull-up on DP (1.5K) and reset */
	124	reg = ULPI_FUNC_CTRL_TERMSELECT \| ULPI_FUNC_CTRL_RESET;
fcc8ebc9	125	isp1704_write(isp, ULPI_SET(ULPI_FUNC_CTRL), reg);
bac43b20 HK	126	usleep_range(1000, 2000);
bac43b20 HK	127
fcc8ebc9	128	reg = isp1704_read(isp, ULPI_DEBUG);
bac43b20 HK	129	if ((reg & 3) != 3)
	130	type = POWER_SUPPLY_TYPE_USB_CDP;
	131
	132	/* recover original state */
fcc8ebc9 HK	133	isp1704_write(isp, ULPI_FUNC_CTRL, func_ctrl);
fcc8ebc9 HK	134	isp1704_write(isp, ULPI_OTG_CTRL, otg_ctrl);
bac43b20 HK	135
	136	return type;
	137	}
	138
ec46475f HK	139	/*
	140	* ISP1704 detects PS/2 adapters as charger. To make sure the detected charger
	141	* is actually a dedicated charger, the following steps need to be taken.
	142	*/
	143	static inline int isp1704_charger_verify(struct isp1704_charger *isp)
	144	{
	145	int ret = 0;
	146	u8 r;
	147
	148	/* Reset the transceiver */
fcc8ebc9	149	r = isp1704_read(isp, ULPI_FUNC_CTRL);
ec46475f	150	r \|= ULPI_FUNC_CTRL_RESET;
fcc8ebc9	151	isp1704_write(isp, ULPI_FUNC_CTRL, r);
ec46475f HK	152	usleep_range(1000, 2000);
	153
	154	/* Set normal mode */
	155	r &= ~(ULPI_FUNC_CTRL_RESET \| ULPI_FUNC_CTRL_OPMODE_MASK);
fcc8ebc9	156	isp1704_write(isp, ULPI_FUNC_CTRL, r);
ec46475f HK	157
	158	/* Clear the DP and DM pull-down bits */
	159	r = ULPI_OTG_CTRL_DP_PULLDOWN \| ULPI_OTG_CTRL_DM_PULLDOWN;
fcc8ebc9	160	isp1704_write(isp, ULPI_CLR(ULPI_OTG_CTRL), r);
ec46475f HK	161
	162	/* Enable strong pull-up on DP (1.5K) and reset */
	163	r = ULPI_FUNC_CTRL_TERMSELECT \| ULPI_FUNC_CTRL_RESET;
fcc8ebc9	164	isp1704_write(isp, ULPI_SET(ULPI_FUNC_CTRL), r);
ec46475f HK	165	usleep_range(1000, 2000);
	166
	167	/* Read the line state */
fcc8ebc9	168	if (!isp1704_read(isp, ULPI_DEBUG)) {
ec46475f	169	/* Disable strong pull-up on DP (1.5K) */
fcc8ebc9	170	isp1704_write(isp, ULPI_CLR(ULPI_FUNC_CTRL),
ec46475f HK	171	ULPI_FUNC_CTRL_TERMSELECT);
	172	return 1;
	173	}
	174
	175	/* Is it a charger or PS/2 connection */
	176
	177	/* Enable weak pull-up resistor on DP */
fcc8ebc9	178	isp1704_write(isp, ULPI_SET(ISP1704_PWR_CTRL),
ec46475f HK	179	ISP1704_PWR_CTRL_DP_WKPU_EN);
	180
	181	/* Disable strong pull-up on DP (1.5K) */
fcc8ebc9	182	isp1704_write(isp, ULPI_CLR(ULPI_FUNC_CTRL),
ec46475f HK	183	ULPI_FUNC_CTRL_TERMSELECT);
	184
	185	/* Enable weak pull-down resistor on DM */
fcc8ebc9	186	isp1704_write(isp, ULPI_SET(ULPI_OTG_CTRL),
ec46475f HK	187	ULPI_OTG_CTRL_DM_PULLDOWN);
	188
	189	/* It's a charger if the line states are clear */
fcc8ebc9	190	if (!(isp1704_read(isp, ULPI_DEBUG)))
ec46475f HK	191	ret = 1;
	192
	193	/* Disable weak pull-up resistor on DP */
fcc8ebc9	194	isp1704_write(isp, ULPI_CLR(ISP1704_PWR_CTRL),
ec46475f HK	195	ISP1704_PWR_CTRL_DP_WKPU_EN);
	196
	197	return ret;
	198	}
	199
	200	static inline int isp1704_charger_detect(struct isp1704_charger *isp)
	201	{
	202	unsigned long timeout;
bac43b20	203	u8 pwr_ctrl;
ec46475f HK	204	int ret = 0;
ec46475f HK	205
fcc8ebc9	206	pwr_ctrl = isp1704_read(isp, ISP1704_PWR_CTRL);
bac43b20	207
ec46475f	208	/* set SW control bit in PWR_CTRL register */
fcc8ebc9	209	isp1704_write(isp, ISP1704_PWR_CTRL,
ec46475f HK	210	ISP1704_PWR_CTRL_SWCTRL);
	211
	212	/* enable manual charger detection */
fcc8ebc9	213	isp1704_write(isp, ULPI_SET(ISP1704_PWR_CTRL),
bac43b20 HK	214	ISP1704_PWR_CTRL_SWCTRL
bac43b20 HK	215	\| ISP1704_PWR_CTRL_DPVSRC_EN);
ec46475f HK	216	usleep_range(1000, 2000);
	217
	218	timeout = jiffies + msecs_to_jiffies(300);
	219	do {
	220	/* Check if there is a charger */
fcc8ebc9	221	if (isp1704_read(isp, ISP1704_PWR_CTRL)
ec46475f HK	222	& ISP1704_PWR_CTRL_VDAT_DET) {
	223	ret = isp1704_charger_verify(isp);
	224	break;
	225	}
bac43b20 HK	226	} while (!time_after(jiffies, timeout) && isp->online);
	227
	228	/* recover original state */
fcc8ebc9	229	isp1704_write(isp, ISP1704_PWR_CTRL, pwr_ctrl);
ec46475f HK	230
	231	return ret;
	232	}
	233
	234	static void isp1704_charger_work(struct work_struct *data)
	235	{
	236	int detect;
bac43b20 HK	237	unsigned long event;
bac43b20 HK	238	unsigned power;
ec46475f HK	239	struct isp1704_charger *isp =
ec46475f HK	240	container_of(data, struct isp1704_charger, work);
bac43b20	241	static DEFINE_MUTEX(lock);
ec46475f	242
bac43b20 HK	243	event = isp->event;
bac43b20 HK	244	power = isp->max_power;
ec46475f	245
bac43b20	246	mutex_lock(&lock);
ec46475f	247
2785cefc KJ	248	if (event != USB_EVENT_NONE)
	249	isp1704_charger_set_power(isp, 1);
	250
ec46475f HK	251	switch (event) {
ec46475f HK	252	case USB_EVENT_VBUS:
bac43b20 HK	253	isp->online = true;
	254
	255	/* detect charger */
	256	detect = isp1704_charger_detect(isp);
	257
	258	if (detect) {
	259	isp->present = detect;
	260	isp->psy.type = isp1704_charger_type(isp);
	261	}
	262
	263	switch (isp->psy.type) {
	264	case POWER_SUPPLY_TYPE_USB_DCP:
	265	isp->current_max = 1800;
	266	break;
	267	case POWER_SUPPLY_TYPE_USB_CDP:
	268	/*
	269	* Only 500mA here or high speed chirp
	270	* handshaking may break
	271	*/
	272	isp->current_max = 500;
	273	/* FALLTHROUGH */
	274	case POWER_SUPPLY_TYPE_USB:
	275	default:
	276	/* enable data pullups */
b1c711d6 HK	277	if (isp->phy->otg->gadget)
b1c711d6 HK	278	usb_gadget_connect(isp->phy->otg->gadget);
bac43b20	279	}
ec46475f HK	280	break;
ec46475f HK	281	case USB_EVENT_NONE:
bac43b20 HK	282	isp->online = false;
	283	isp->current_max = 0;
	284	isp->present = 0;
	285	isp->current_max = 0;
	286	isp->psy.type = POWER_SUPPLY_TYPE_USB;
	287
	288	/*
	289	* Disable data pullups. We need to prevent the controller from
	290	* enumerating.
	291	*
	292	* FIXME: This is here to allow charger detection with Host/HUB
	293	* chargers. The pullups may be enabled elsewhere, so this can
	294	* not be the final solution.
	295	*/
b1c711d6 HK	296	if (isp->phy->otg->gadget)
b1c711d6 HK	297	usb_gadget_disconnect(isp->phy->otg->gadget);
2785cefc KJ	298
2785cefc KJ	299	isp1704_charger_set_power(isp, 0);
bac43b20 HK	300	break;
	301	case USB_EVENT_ENUMERATED:
	302	if (isp->present)
	303	isp->current_max = 1800;
	304	else
	305	isp->current_max = power;
ec46475f HK	306	break;
ec46475f HK	307	default:
bac43b20	308	goto out;
ec46475f HK	309	}
ec46475f HK	310
bac43b20 HK	311	power_supply_changed(&isp->psy);
	312	out:
	313	mutex_unlock(&lock);
	314	}
	315
	316	static int isp1704_notifier_call(struct notifier_block *nb,
	317	unsigned long event, void *power)
	318	{
	319	struct isp1704_charger *isp =
	320	container_of(nb, struct isp1704_charger, nb);
	321
	322	isp->event = event;
	323
	324	if (power)
	325	isp->max_power = ((unsigned )power);
	326
	327	schedule_work(&isp->work);
	328
ec46475f HK	329	return NOTIFY_OK;
	330	}
	331
	332	static int isp1704_charger_get_property(struct power_supply *psy,
	333	enum power_supply_property psp,
	334	union power_supply_propval *val)
	335	{
	336	struct isp1704_charger *isp =
	337	container_of(psy, struct isp1704_charger, psy);
	338
	339	switch (psp) {
	340	case POWER_SUPPLY_PROP_PRESENT:
	341	val->intval = isp->present;
	342	break;
bac43b20 HK	343	case POWER_SUPPLY_PROP_ONLINE:
	344	val->intval = isp->online;
	345	break;
	346	case POWER_SUPPLY_PROP_CURRENT_MAX:
	347	val->intval = isp->current_max;
	348	break;
ec46475f HK	349	case POWER_SUPPLY_PROP_MODEL_NAME:
	350	val->strval = isp->model;
	351	break;
	352	case POWER_SUPPLY_PROP_MANUFACTURER:
	353	val->strval = "NXP";
	354	break;
	355	default:
	356	return -EINVAL;
	357	}
	358	return 0;
	359	}
	360
	361	static enum power_supply_property power_props[] = {
	362	POWER_SUPPLY_PROP_PRESENT,
bac43b20 HK	363	POWER_SUPPLY_PROP_ONLINE,
bac43b20 HK	364	POWER_SUPPLY_PROP_CURRENT_MAX,
ec46475f HK	365	POWER_SUPPLY_PROP_MODEL_NAME,
	366	POWER_SUPPLY_PROP_MANUFACTURER,
	367	};
	368
	369	static inline int isp1704_test_ulpi(struct isp1704_charger *isp)
	370	{
	371	int vendor;
	372	int product;
	373	int i;
	374	int ret = -ENODEV;
	375
	376	/* Test ULPI interface */
fcc8ebc9	377	ret = isp1704_write(isp, ULPI_SCRATCH, 0xaa);
ec46475f HK	378	if (ret < 0)
	379	return ret;
	380
fcc8ebc9	381	ret = isp1704_read(isp, ULPI_SCRATCH);
ec46475f HK	382	if (ret < 0)
	383	return ret;
	384
	385	if (ret != 0xaa)
	386	return -ENODEV;
	387
	388	/* Verify the product and vendor id matches */
fcc8ebc9 HK	389	vendor = isp1704_read(isp, ULPI_VENDOR_ID_LOW);
fcc8ebc9 HK	390	vendor \|= isp1704_read(isp, ULPI_VENDOR_ID_HIGH) << 8;
ec46475f HK	391	if (vendor != NXP_VENDOR_ID)
	392	return -ENODEV;
	393
fcc8ebc9 HK	394	product = isp1704_read(isp, ULPI_PRODUCT_ID_LOW);
fcc8ebc9 HK	395	product \|= isp1704_read(isp, ULPI_PRODUCT_ID_HIGH) << 8;
ec46475f HK	396
	397	for (i = 0; i < ARRAY_SIZE(isp170x_id); i++) {
	398	if (product == isp170x_id[i]) {
	399	sprintf(isp->model, "isp%x", product);
	400	return product;
	401	}
	402	}
	403
	404	dev_err(isp->dev, "product id %x not matching known ids", product);
	405
	406	return -ENODEV;
	407	}
	408
c8afa640	409	static int isp1704_charger_probe(struct platform_device *pdev)
ec46475f HK	410	{
	411	struct isp1704_charger *isp;
	412	int ret = -ENODEV;
	413
2a2ce52a	414	isp = devm_kzalloc(&pdev->dev, sizeof(*isp), GFP_KERNEL);
ec46475f HK	415	if (!isp)
	416	return -ENOMEM;
	417
662dca54	418	isp->phy = usb_get_phy(USB_PHY_TYPE_USB2);
ded017ee	419	if (IS_ERR_OR_NULL(isp->phy))
ec46475f HK	420	goto fail0;
ec46475f HK	421
a4607d9f HK	422	isp->dev = &pdev->dev;
	423	platform_set_drvdata(pdev, isp);
	424
2785cefc KJ	425	isp1704_charger_set_power(isp, 1);
2785cefc KJ	426
ec46475f HK	427	ret = isp1704_test_ulpi(isp);
	428	if (ret < 0)
	429	goto fail1;
	430
ec46475f HK	431	isp->psy.name = "isp1704";
	432	isp->psy.type = POWER_SUPPLY_TYPE_USB;
	433	isp->psy.properties = power_props;
	434	isp->psy.num_properties = ARRAY_SIZE(power_props);
	435	isp->psy.get_property = isp1704_charger_get_property;
	436
	437	ret = power_supply_register(isp->dev, &isp->psy);
	438	if (ret)
	439	goto fail1;
	440
	441	/*
fcc8ebc9	442	* REVISIT: using work in order to allow the usb notifications to be
ec46475f HK	443	* made atomically in the future.
	444	*/
	445	INIT_WORK(&isp->work, isp1704_charger_work);
	446
	447	isp->nb.notifier_call = isp1704_notifier_call;
	448
fcc8ebc9	449	ret = usb_register_notifier(isp->phy, &isp->nb);
ec46475f HK	450	if (ret)
	451	goto fail2;
	452
	453	dev_info(isp->dev, "registered with product id %s\n", isp->model);
	454
e1a85694 HK	455	/*
	456	* Taking over the D+ pullup.
	457	*
	458	* FIXME: The device will be disconnected if it was already
	459	* enumerated. The charger driver should be always loaded before any
	460	* gadget is loaded.
	461	*/
b1c711d6 HK	462	if (isp->phy->otg->gadget)
b1c711d6 HK	463	usb_gadget_disconnect(isp->phy->otg->gadget);
e1a85694 HK	464
e1a85694 HK	465	/* Detect charger if VBUS is valid (the cable was already plugged). */
fcc8ebc9	466	ret = isp1704_read(isp, ULPI_USB_INT_STS);
2785cefc	467	isp1704_charger_set_power(isp, 0);
fcc8ebc9	468	if ((ret & ULPI_INT_VBUS_VALID) && !isp->phy->otg->default_a) {
e1a85694 HK	469	isp->event = USB_EVENT_VBUS;
	470	schedule_work(&isp->work);
	471	}
	472
ec46475f HK	473	return 0;
	474	fail2:
	475	power_supply_unregister(&isp->psy);
	476	fail1:
81a08382	477	isp1704_charger_set_power(isp, 0);
721002ec	478	usb_put_phy(isp->phy);
ec46475f	479	fail0:
ec46475f HK	480	dev_err(&pdev->dev, "failed to register isp1704 with error %d\n", ret);
	481
	482	return ret;
	483	}
	484
415ec69f	485	static int isp1704_charger_remove(struct platform_device *pdev)
ec46475f HK	486	{
	487	struct isp1704_charger *isp = platform_get_drvdata(pdev);
	488
fcc8ebc9	489	usb_unregister_notifier(isp->phy, &isp->nb);
ec46475f	490	power_supply_unregister(&isp->psy);
721002ec	491	usb_put_phy(isp->phy);
2785cefc	492	isp1704_charger_set_power(isp, 0);
ec46475f HK	493
	494	return 0;
	495	}
	496
	497	static struct platform_driver isp1704_charger_driver = {
	498	.driver = {
	499	.name = "isp1704_charger",
	500	},
	501	.probe = isp1704_charger_probe,
28ea73f4	502	.remove = isp1704_charger_remove,
ec46475f HK	503	};
ec46475f HK	504
300bac7f	505	module_platform_driver(isp1704_charger_driver);
ec46475f HK	506
	507	MODULE_ALIAS("platform:isp1704_charger");
	508	MODULE_AUTHOR("Nokia Corporation");
	509	MODULE_DESCRIPTION("ISP170x USB Charger driver");
	510	MODULE_LICENSE("GPL");