[deliverable/linux.git] / drivers / power / isp1704_charger.c

/*
 * ISP1704 USB Charger Detection driver
 *
 * Copyright (C) 2010 Nokia Corporation
 * Copyright (C) 2012 - 2013 Pali Rohár <pali.rohar@gmail.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.
 *
 * 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/of.h>
#include <linux/of_gpio.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;
};

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);
	else if (board)
		gpio_set_value(board->enable_gpio, 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 inline int isp1704_charger_detect_dcp(struct isp1704_charger *isp)
{
	if (isp1704_charger_detect(isp) &&
			isp1704_charger_type(isp) == POWER_SUPPLY_TYPE_USB_DCP)
		return true;
	else
		return false;
}

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

	mutex_lock(&lock);

	switch (isp->phy->last_event) {
	case USB_EVENT_VBUS:
		/* do not call wall charger detection more times */
		if (!isp->present) {
			isp->online = true;
			isp->present = 1;
			isp1704_charger_set_power(isp, 1);

			/* detect wall charger */
			if (isp1704_charger_detect_dcp(isp)) {
				isp->psy.type = POWER_SUPPLY_TYPE_USB_DCP;
				isp->current_max = 1800;
			} else {
				isp->psy.type = POWER_SUPPLY_TYPE_USB;
				isp->current_max = 500;
			}

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

		if (isp->psy.type != POWER_SUPPLY_TYPE_USB_DCP) {
			/*
			 * Only 500mA here or high speed chirp
			 * handshaking may break
			 */
			if (isp->current_max > 500)
				isp->current_max = 500;

			if (isp->current_max > 100)
				isp->psy.type = POWER_SUPPLY_TYPE_USB_CDP;
		}
		break;
	case USB_EVENT_NONE:
		isp->online = false;
		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;
	default:
		goto out;
	}

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

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

	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;

	struct isp1704_charger_data *pdata = dev_get_platdata(&pdev->dev);
	struct device_node *np = pdev->dev.of_node;

	if (np) {
		int gpio = of_get_named_gpio(np, "nxp,enable-gpio", 0);

		if (gpio < 0)
			return gpio;

		pdata = devm_kzalloc(&pdev->dev,
			sizeof(struct isp1704_charger_data), GFP_KERNEL);
		pdata->enable_gpio = gpio;

		dev_info(&pdev->dev, "init gpio %d\n", pdata->enable_gpio);

		ret = devm_gpio_request_one(&pdev->dev, pdata->enable_gpio,
					GPIOF_OUT_INIT_HIGH, "isp1704_reset");
		if (ret)
			goto fail0;
	}

	if (!pdata) {
		dev_err(&pdev->dev, "missing platform data!\n");
		return -ENODEV;
	}


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

	if (np)
		isp->phy = devm_usb_get_phy_by_phandle(&pdev->dev, "usb-phy", 0);
	else
		isp->phy = devm_usb_get_phy(&pdev->dev, USB_PHY_TYPE_USB2);

	if (IS_ERR(isp->phy)) {
		ret = PTR_ERR(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);

	if (isp->phy->last_event == USB_EVENT_NONE)
		isp1704_charger_set_power(isp, 0);

	/* Detect charger if VBUS is valid (the cable was already plugged). */
	if (isp->phy->last_event == USB_EVENT_VBUS &&
			!isp->phy->otg->default_a)
		schedule_work(&isp->work);

	return 0;
fail2:
	power_supply_unregister(&isp->psy);
fail1:
	isp1704_charger_set_power(isp, 0);
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);
	isp1704_charger_set_power(isp, 0);

	return 0;
}

#ifdef CONFIG_OF
static const struct of_device_id omap_isp1704_of_match[] = {
	{ .compatible = "nxp,isp1704", },
	{},
};
MODULE_DEVICE_TABLE(of, omap_isp1704_of_match);
#endif

static struct platform_driver isp1704_charger_driver = {
	.driver = {
		.name = "isp1704_charger",
		.of_match_table = of_match_ptr(omap_isp1704_of_match),
	},
	.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
f07c11ea	5	* Copyright (C) 2012 - 2013 Pali Rohár <pali.rohar@gmail.com>
ec46475f HK	6	*
	7	* This program is free software; you can redistribute it and/or modify
	8	* it under the terms of the GNU General Public License as published by
	9	* the Free Software Foundation; either version 2 of the License, or
	10	* (at your option) any later version.
	11	*
	12	* This program is distributed in the hope that it will be useful,
	13	* but WITHOUT ANY WARRANTY; without even the implied warranty of
	14	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	15	* GNU General Public License for more details.
	16	*
	17	* You should have received a copy of the GNU General Public License
	18	* along with this program; if not, write to the Free Software
	19	* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
	20	*/
	21
	22	#include <linux/kernel.h>
	23	#include <linux/module.h>
	24	#include <linux/err.h>
	25	#include <linux/init.h>
	26	#include <linux/types.h>
	27	#include <linux/device.h>
	28	#include <linux/sysfs.h>
	29	#include <linux/platform_device.h>
	30	#include <linux/power_supply.h>
	31	#include <linux/delay.h>
34a10961 SR	32	#include <linux/of.h>
34a10961 SR	33	#include <linux/of_gpio.h>
ec46475f HK	34
	35	#include <linux/usb/otg.h>
	36	#include <linux/usb/ulpi.h>
	37	#include <linux/usb/ch9.h>
	38	#include <linux/usb/gadget.h>
2785cefc	39	#include <linux/power/isp1704_charger.h>
ec46475f HK	40
	41	/* Vendor specific Power Control register */
	42	#define ISP1704_PWR_CTRL 0x3d
	43	#define ISP1704_PWR_CTRL_SWCTRL (1 << 0)
	44	#define ISP1704_PWR_CTRL_DET_COMP (1 << 1)
	45	#define ISP1704_PWR_CTRL_BVALID_RISE (1 << 2)
	46	#define ISP1704_PWR_CTRL_BVALID_FALL (1 << 3)
	47	#define ISP1704_PWR_CTRL_DP_WKPU_EN (1 << 4)
	48	#define ISP1704_PWR_CTRL_VDAT_DET (1 << 5)
	49	#define ISP1704_PWR_CTRL_DPVSRC_EN (1 << 6)
	50	#define ISP1704_PWR_CTRL_HWDETECT (1 << 7)
	51
	52	#define NXP_VENDOR_ID 0x04cc
	53
	54	static u16 isp170x_id[] = {
	55	0x1704,
	56	0x1707,
	57	};
	58
	59	struct isp1704_charger {
	60	struct device *dev;
	61	struct power_supply psy;
fcc8ebc9	62	struct usb_phy *phy;
ec46475f HK	63	struct notifier_block nb;
	64	struct work_struct work;
	65
bac43b20	66	/* properties */
746d8fb8	67	char model[8];
ec46475f	68	unsigned present:1;
bac43b20 HK	69	unsigned online:1;
bac43b20 HK	70	unsigned current_max;
ec46475f HK	71	};
ec46475f HK	72
fcc8ebc9 HK	73	static inline int isp1704_read(struct isp1704_charger *isp, u32 reg)
	74	{
	75	return usb_phy_io_read(isp->phy, reg);
	76	}
	77
	78	static inline int isp1704_write(struct isp1704_charger *isp, u32 val, u32 reg)
	79	{
	80	return usb_phy_io_write(isp->phy, val, reg);
	81	}
	82
2785cefc KJ	83	/*
	84	* Disable/enable the power from the isp1704 if a function for it
	85	* has been provided with platform data.
	86	*/
	87	static void isp1704_charger_set_power(struct isp1704_charger *isp, bool on)
	88	{
	89	struct isp1704_charger_data *board = isp->dev->platform_data;
	90
c934502d	91	if (board && board->set_power)
2785cefc	92	board->set_power(on);
34a10961 SR	93	else if (board)
34a10961 SR	94	gpio_set_value(board->enable_gpio, on);
2785cefc KJ	95	}
2785cefc KJ	96
bac43b20 HK	97	/*
	98	* Determine is the charging port DCP (dedicated charger) or CDP (Host/HUB
	99	* chargers).
	100	*
	101	* REVISIT: The method is defined in Battery Charging Specification and is
	102	* applicable to any ULPI transceiver. Nothing isp170x specific here.
	103	*/
	104	static inline int isp1704_charger_type(struct isp1704_charger *isp)
	105	{
	106	u8 reg;
	107	u8 func_ctrl;
	108	u8 otg_ctrl;
	109	int type = POWER_SUPPLY_TYPE_USB_DCP;
	110
fcc8ebc9 HK	111	func_ctrl = isp1704_read(isp, ULPI_FUNC_CTRL);
fcc8ebc9 HK	112	otg_ctrl = isp1704_read(isp, ULPI_OTG_CTRL);
bac43b20 HK	113
	114	/* disable pulldowns */
	115	reg = ULPI_OTG_CTRL_DM_PULLDOWN \| ULPI_OTG_CTRL_DP_PULLDOWN;
fcc8ebc9	116	isp1704_write(isp, ULPI_CLR(ULPI_OTG_CTRL), reg);
bac43b20 HK	117
bac43b20 HK	118	/* full speed */
fcc8ebc9	119	isp1704_write(isp, ULPI_CLR(ULPI_FUNC_CTRL),
bac43b20	120	ULPI_FUNC_CTRL_XCVRSEL_MASK);
fcc8ebc9	121	isp1704_write(isp, ULPI_SET(ULPI_FUNC_CTRL),
bac43b20 HK	122	ULPI_FUNC_CTRL_FULL_SPEED);
	123
	124	/* Enable strong pull-up on DP (1.5K) and reset */
	125	reg = ULPI_FUNC_CTRL_TERMSELECT \| ULPI_FUNC_CTRL_RESET;
fcc8ebc9	126	isp1704_write(isp, ULPI_SET(ULPI_FUNC_CTRL), reg);
bac43b20 HK	127	usleep_range(1000, 2000);
bac43b20 HK	128
fcc8ebc9	129	reg = isp1704_read(isp, ULPI_DEBUG);
bac43b20 HK	130	if ((reg & 3) != 3)
	131	type = POWER_SUPPLY_TYPE_USB_CDP;
	132
	133	/* recover original state */
fcc8ebc9 HK	134	isp1704_write(isp, ULPI_FUNC_CTRL, func_ctrl);
fcc8ebc9 HK	135	isp1704_write(isp, ULPI_OTG_CTRL, otg_ctrl);
bac43b20 HK	136
	137	return type;
	138	}
	139
ec46475f HK	140	/*
	141	* ISP1704 detects PS/2 adapters as charger. To make sure the detected charger
	142	* is actually a dedicated charger, the following steps need to be taken.
	143	*/
	144	static inline int isp1704_charger_verify(struct isp1704_charger *isp)
	145	{
	146	int ret = 0;
	147	u8 r;
	148
	149	/* Reset the transceiver */
fcc8ebc9	150	r = isp1704_read(isp, ULPI_FUNC_CTRL);
ec46475f	151	r \|= ULPI_FUNC_CTRL_RESET;
fcc8ebc9	152	isp1704_write(isp, ULPI_FUNC_CTRL, r);
ec46475f HK	153	usleep_range(1000, 2000);
	154
	155	/* Set normal mode */
	156	r &= ~(ULPI_FUNC_CTRL_RESET \| ULPI_FUNC_CTRL_OPMODE_MASK);
fcc8ebc9	157	isp1704_write(isp, ULPI_FUNC_CTRL, r);
ec46475f HK	158
	159	/* Clear the DP and DM pull-down bits */
	160	r = ULPI_OTG_CTRL_DP_PULLDOWN \| ULPI_OTG_CTRL_DM_PULLDOWN;
fcc8ebc9	161	isp1704_write(isp, ULPI_CLR(ULPI_OTG_CTRL), r);
ec46475f HK	162
	163	/* Enable strong pull-up on DP (1.5K) and reset */
	164	r = ULPI_FUNC_CTRL_TERMSELECT \| ULPI_FUNC_CTRL_RESET;
fcc8ebc9	165	isp1704_write(isp, ULPI_SET(ULPI_FUNC_CTRL), r);
ec46475f HK	166	usleep_range(1000, 2000);
	167
	168	/* Read the line state */
fcc8ebc9	169	if (!isp1704_read(isp, ULPI_DEBUG)) {
ec46475f	170	/* Disable strong pull-up on DP (1.5K) */
fcc8ebc9	171	isp1704_write(isp, ULPI_CLR(ULPI_FUNC_CTRL),
ec46475f HK	172	ULPI_FUNC_CTRL_TERMSELECT);
	173	return 1;
	174	}
	175
	176	/* Is it a charger or PS/2 connection */
	177
	178	/* Enable weak pull-up resistor on DP */
fcc8ebc9	179	isp1704_write(isp, ULPI_SET(ISP1704_PWR_CTRL),
ec46475f HK	180	ISP1704_PWR_CTRL_DP_WKPU_EN);
	181
	182	/* Disable strong pull-up on DP (1.5K) */
fcc8ebc9	183	isp1704_write(isp, ULPI_CLR(ULPI_FUNC_CTRL),
ec46475f HK	184	ULPI_FUNC_CTRL_TERMSELECT);
	185
	186	/* Enable weak pull-down resistor on DM */
fcc8ebc9	187	isp1704_write(isp, ULPI_SET(ULPI_OTG_CTRL),
ec46475f HK	188	ULPI_OTG_CTRL_DM_PULLDOWN);
	189
	190	/* It's a charger if the line states are clear */
fcc8ebc9	191	if (!(isp1704_read(isp, ULPI_DEBUG)))
ec46475f HK	192	ret = 1;
	193
	194	/* Disable weak pull-up resistor on DP */
fcc8ebc9	195	isp1704_write(isp, ULPI_CLR(ISP1704_PWR_CTRL),
ec46475f HK	196	ISP1704_PWR_CTRL_DP_WKPU_EN);
	197
	198	return ret;
	199	}
	200
	201	static inline int isp1704_charger_detect(struct isp1704_charger *isp)
	202	{
	203	unsigned long timeout;
bac43b20	204	u8 pwr_ctrl;
ec46475f HK	205	int ret = 0;
ec46475f HK	206
fcc8ebc9	207	pwr_ctrl = isp1704_read(isp, ISP1704_PWR_CTRL);
bac43b20	208
ec46475f	209	/* set SW control bit in PWR_CTRL register */
fcc8ebc9	210	isp1704_write(isp, ISP1704_PWR_CTRL,
ec46475f HK	211	ISP1704_PWR_CTRL_SWCTRL);
	212
	213	/* enable manual charger detection */
fcc8ebc9	214	isp1704_write(isp, ULPI_SET(ISP1704_PWR_CTRL),
bac43b20 HK	215	ISP1704_PWR_CTRL_SWCTRL
bac43b20 HK	216	\| ISP1704_PWR_CTRL_DPVSRC_EN);
ec46475f HK	217	usleep_range(1000, 2000);
	218
	219	timeout = jiffies + msecs_to_jiffies(300);
	220	do {
	221	/* Check if there is a charger */
fcc8ebc9	222	if (isp1704_read(isp, ISP1704_PWR_CTRL)
ec46475f HK	223	& ISP1704_PWR_CTRL_VDAT_DET) {
	224	ret = isp1704_charger_verify(isp);
	225	break;
	226	}
bac43b20 HK	227	} while (!time_after(jiffies, timeout) && isp->online);
	228
	229	/* recover original state */
fcc8ebc9	230	isp1704_write(isp, ISP1704_PWR_CTRL, pwr_ctrl);
ec46475f HK	231
	232	return ret;
	233	}
	234
f07c11ea PR	235	static inline int isp1704_charger_detect_dcp(struct isp1704_charger *isp)
	236	{
	237	if (isp1704_charger_detect(isp) &&
	238	isp1704_charger_type(isp) == POWER_SUPPLY_TYPE_USB_DCP)
	239	return true;
	240	else
	241	return false;
	242	}
	243
ec46475f HK	244	static void isp1704_charger_work(struct work_struct *data)
ec46475f HK	245	{
ec46475f HK	246	struct isp1704_charger *isp =
ec46475f HK	247	container_of(data, struct isp1704_charger, work);
bac43b20	248	static DEFINE_MUTEX(lock);
ec46475f	249
bac43b20	250	mutex_lock(&lock);
ec46475f	251
f07c11ea	252	switch (isp->phy->last_event) {
ec46475f	253	case USB_EVENT_VBUS:
f07c11ea PR	254	/* do not call wall charger detection more times */
	255	if (!isp->present) {
	256	isp->online = true;
	257	isp->present = 1;
	258	isp1704_charger_set_power(isp, 1);
	259
	260	/* detect wall charger */
	261	if (isp1704_charger_detect_dcp(isp)) {
	262	isp->psy.type = POWER_SUPPLY_TYPE_USB_DCP;
	263	isp->current_max = 1800;
	264	} else {
	265	isp->psy.type = POWER_SUPPLY_TYPE_USB;
	266	isp->current_max = 500;
	267	}
bac43b20	268
f07c11ea PR	269	/* enable data pullups */
	270	if (isp->phy->otg->gadget)
	271	usb_gadget_connect(isp->phy->otg->gadget);
bac43b20 HK	272	}
bac43b20 HK	273
f07c11ea	274	if (isp->psy.type != POWER_SUPPLY_TYPE_USB_DCP) {
bac43b20 HK	275	/*
	276	* Only 500mA here or high speed chirp
	277	* handshaking may break
	278	*/
f07c11ea PR	279	if (isp->current_max > 500)
	280	isp->current_max = 500;
	281
	282	if (isp->current_max > 100)
	283	isp->psy.type = POWER_SUPPLY_TYPE_USB_CDP;
bac43b20	284	}
ec46475f HK	285	break;
ec46475f HK	286	case USB_EVENT_NONE:
bac43b20	287	isp->online = false;
bac43b20 HK	288	isp->present = 0;
	289	isp->current_max = 0;
	290	isp->psy.type = POWER_SUPPLY_TYPE_USB;
	291
	292	/*
	293	* Disable data pullups. We need to prevent the controller from
	294	* enumerating.
	295	*
	296	* FIXME: This is here to allow charger detection with Host/HUB
	297	* chargers. The pullups may be enabled elsewhere, so this can
	298	* not be the final solution.
	299	*/
b1c711d6 HK	300	if (isp->phy->otg->gadget)
b1c711d6 HK	301	usb_gadget_disconnect(isp->phy->otg->gadget);
2785cefc KJ	302
2785cefc KJ	303	isp1704_charger_set_power(isp, 0);
bac43b20	304	break;
ec46475f	305	default:
bac43b20	306	goto out;
ec46475f HK	307	}
ec46475f HK	308
bac43b20 HK	309	power_supply_changed(&isp->psy);
	310	out:
	311	mutex_unlock(&lock);
	312	}
	313
	314	static int isp1704_notifier_call(struct notifier_block *nb,
f07c11ea	315	unsigned long val, void *v)
bac43b20 HK	316	{
	317	struct isp1704_charger *isp =
	318	container_of(nb, struct isp1704_charger, nb);
	319
bac43b20 HK	320	schedule_work(&isp->work);
bac43b20 HK	321
ec46475f HK	322	return NOTIFY_OK;
	323	}
	324
	325	static int isp1704_charger_get_property(struct power_supply *psy,
	326	enum power_supply_property psp,
	327	union power_supply_propval *val)
	328	{
	329	struct isp1704_charger *isp =
	330	container_of(psy, struct isp1704_charger, psy);
	331
	332	switch (psp) {
	333	case POWER_SUPPLY_PROP_PRESENT:
	334	val->intval = isp->present;
	335	break;
bac43b20 HK	336	case POWER_SUPPLY_PROP_ONLINE:
	337	val->intval = isp->online;
	338	break;
	339	case POWER_SUPPLY_PROP_CURRENT_MAX:
	340	val->intval = isp->current_max;
	341	break;
ec46475f HK	342	case POWER_SUPPLY_PROP_MODEL_NAME:
	343	val->strval = isp->model;
	344	break;
	345	case POWER_SUPPLY_PROP_MANUFACTURER:
	346	val->strval = "NXP";
	347	break;
	348	default:
	349	return -EINVAL;
	350	}
	351	return 0;
	352	}
	353
	354	static enum power_supply_property power_props[] = {
	355	POWER_SUPPLY_PROP_PRESENT,
bac43b20 HK	356	POWER_SUPPLY_PROP_ONLINE,
bac43b20 HK	357	POWER_SUPPLY_PROP_CURRENT_MAX,
ec46475f HK	358	POWER_SUPPLY_PROP_MODEL_NAME,
	359	POWER_SUPPLY_PROP_MANUFACTURER,
	360	};
	361
	362	static inline int isp1704_test_ulpi(struct isp1704_charger *isp)
	363	{
	364	int vendor;
	365	int product;
	366	int i;
	367	int ret = -ENODEV;
	368
	369	/* Test ULPI interface */
fcc8ebc9	370	ret = isp1704_write(isp, ULPI_SCRATCH, 0xaa);
ec46475f HK	371	if (ret < 0)
	372	return ret;
	373
fcc8ebc9	374	ret = isp1704_read(isp, ULPI_SCRATCH);
ec46475f HK	375	if (ret < 0)
	376	return ret;
	377
	378	if (ret != 0xaa)
	379	return -ENODEV;
	380
	381	/* Verify the product and vendor id matches */
fcc8ebc9 HK	382	vendor = isp1704_read(isp, ULPI_VENDOR_ID_LOW);
fcc8ebc9 HK	383	vendor \|= isp1704_read(isp, ULPI_VENDOR_ID_HIGH) << 8;
ec46475f HK	384	if (vendor != NXP_VENDOR_ID)
	385	return -ENODEV;
	386
fcc8ebc9 HK	387	product = isp1704_read(isp, ULPI_PRODUCT_ID_LOW);
fcc8ebc9 HK	388	product \|= isp1704_read(isp, ULPI_PRODUCT_ID_HIGH) << 8;
ec46475f HK	389
	390	for (i = 0; i < ARRAY_SIZE(isp170x_id); i++) {
	391	if (product == isp170x_id[i]) {
	392	sprintf(isp->model, "isp%x", product);
	393	return product;
	394	}
	395	}
	396
	397	dev_err(isp->dev, "product id %x not matching known ids", product);
	398
	399	return -ENODEV;
	400	}
	401
c8afa640	402	static int isp1704_charger_probe(struct platform_device *pdev)
ec46475f HK	403	{
	404	struct isp1704_charger *isp;
	405	int ret = -ENODEV;
	406
34a10961 SR	407	struct isp1704_charger_data *pdata = dev_get_platdata(&pdev->dev);
	408	struct device_node *np = pdev->dev.of_node;
	409
	410	if (np) {
	411	int gpio = of_get_named_gpio(np, "nxp,enable-gpio", 0);
	412
	413	if (gpio < 0)
	414	return gpio;
	415
	416	pdata = devm_kzalloc(&pdev->dev,
	417	sizeof(struct isp1704_charger_data), GFP_KERNEL);
	418	pdata->enable_gpio = gpio;
	419
	420	dev_info(&pdev->dev, "init gpio %d\n", pdata->enable_gpio);
	421
	422	ret = devm_gpio_request_one(&pdev->dev, pdata->enable_gpio,
	423	GPIOF_OUT_INIT_HIGH, "isp1704_reset");
	424	if (ret)
	425	goto fail0;
	426	}
	427
	428	if (!pdata) {
	429	dev_err(&pdev->dev, "missing platform data!\n");
	430	return -ENODEV;
	431	}
	432
	433
2a2ce52a	434	isp = devm_kzalloc(&pdev->dev, sizeof(*isp), GFP_KERNEL);
ec46475f HK	435	if (!isp)
	436	return -ENOMEM;
	437
34a10961 SR	438	if (np)
	439	isp->phy = devm_usb_get_phy_by_phandle(&pdev->dev, "usb-phy", 0);
	440	else
	441	isp->phy = devm_usb_get_phy(&pdev->dev, USB_PHY_TYPE_USB2);
	442
	443	if (IS_ERR(isp->phy)) {
	444	ret = PTR_ERR(isp->phy);
	445	goto fail0;
	446	}
ec46475f	447
a4607d9f HK	448	isp->dev = &pdev->dev;
	449	platform_set_drvdata(pdev, isp);
	450
2785cefc KJ	451	isp1704_charger_set_power(isp, 1);
2785cefc KJ	452
ec46475f HK	453	ret = isp1704_test_ulpi(isp);
	454	if (ret < 0)
	455	goto fail1;
	456
ec46475f HK	457	isp->psy.name = "isp1704";
	458	isp->psy.type = POWER_SUPPLY_TYPE_USB;
	459	isp->psy.properties = power_props;
	460	isp->psy.num_properties = ARRAY_SIZE(power_props);
	461	isp->psy.get_property = isp1704_charger_get_property;
	462
	463	ret = power_supply_register(isp->dev, &isp->psy);
	464	if (ret)
	465	goto fail1;
	466
	467	/*
fcc8ebc9	468	* REVISIT: using work in order to allow the usb notifications to be
ec46475f HK	469	* made atomically in the future.
	470	*/
	471	INIT_WORK(&isp->work, isp1704_charger_work);
	472
	473	isp->nb.notifier_call = isp1704_notifier_call;
	474
fcc8ebc9	475	ret = usb_register_notifier(isp->phy, &isp->nb);
ec46475f HK	476	if (ret)
	477	goto fail2;
	478
	479	dev_info(isp->dev, "registered with product id %s\n", isp->model);
	480
e1a85694 HK	481	/*
	482	* Taking over the D+ pullup.
	483	*
	484	* FIXME: The device will be disconnected if it was already
	485	* enumerated. The charger driver should be always loaded before any
	486	* gadget is loaded.
	487	*/
b1c711d6 HK	488	if (isp->phy->otg->gadget)
b1c711d6 HK	489	usb_gadget_disconnect(isp->phy->otg->gadget);
e1a85694	490
f07c11ea PR	491	if (isp->phy->last_event == USB_EVENT_NONE)
	492	isp1704_charger_set_power(isp, 0);
	493
e1a85694	494	/* Detect charger if VBUS is valid (the cable was already plugged). */
f07c11ea PR	495	if (isp->phy->last_event == USB_EVENT_VBUS &&
f07c11ea PR	496	!isp->phy->otg->default_a)
e1a85694	497	schedule_work(&isp->work);
e1a85694	498
ec46475f HK	499	return 0;
	500	fail2:
	501	power_supply_unregister(&isp->psy);
	502	fail1:
81a08382	503	isp1704_charger_set_power(isp, 0);
ec46475f	504	fail0:
ec46475f HK	505	dev_err(&pdev->dev, "failed to register isp1704 with error %d\n", ret);
	506
	507	return ret;
	508	}
	509
415ec69f	510	static int isp1704_charger_remove(struct platform_device *pdev)
ec46475f HK	511	{
	512	struct isp1704_charger *isp = platform_get_drvdata(pdev);
	513
fcc8ebc9	514	usb_unregister_notifier(isp->phy, &isp->nb);
ec46475f	515	power_supply_unregister(&isp->psy);
2785cefc	516	isp1704_charger_set_power(isp, 0);
ec46475f HK	517
	518	return 0;
	519	}
	520
34a10961 SR	521	#ifdef CONFIG_OF
	522	static const struct of_device_id omap_isp1704_of_match[] = {
	523	{ .compatible = "nxp,isp1704", },
	524	{},
	525	};
	526	MODULE_DEVICE_TABLE(of, omap_isp1704_of_match);
	527	#endif
	528
ec46475f HK	529	static struct platform_driver isp1704_charger_driver = {
	530	.driver = {
	531	.name = "isp1704_charger",
34a10961	532	.of_match_table = of_match_ptr(omap_isp1704_of_match),
ec46475f HK	533	},
ec46475f HK	534	.probe = isp1704_charger_probe,
28ea73f4	535	.remove = isp1704_charger_remove,
ec46475f HK	536	};
ec46475f HK	537
300bac7f	538	module_platform_driver(isp1704_charger_driver);
ec46475f HK	539
	540	MODULE_ALIAS("platform:isp1704_charger");
	541	MODULE_AUTHOR("Nokia Corporation");
	542	MODULE_DESCRIPTION("ISP170x USB Charger driver");
	543	MODULE_LICENSE("GPL");