[linux-2.6-block.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 power_supply_desc	psy_desc;
	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 reg, u32 val)
{
	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_desc.type = POWER_SUPPLY_TYPE_USB_DCP;
				isp->current_max = 1800;
			} else {
				isp->psy_desc.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_desc.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_desc.type = POWER_SUPPLY_TYPE_USB_CDP;
		}
		break;
	case USB_EVENT_NONE:
		isp->online = false;
		isp->present = 0;
		isp->current_max = 0;
		isp->psy_desc.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 = power_supply_get_drvdata(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 power_supply_config psy_cfg = {};

	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) {
			dev_err(&pdev->dev, "missing DT GPIO nxp,enable-gpio\n");
			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) {
			dev_err(&pdev->dev, "gpio request failed\n");
			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);
		dev_err(&pdev->dev, "usb_get_phy failed\n");
		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) {
		dev_err(&pdev->dev, "isp1704_test_ulpi failed\n");
		goto fail1;
	}

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

	psy_cfg.drv_data		= isp;

	isp->psy = power_supply_register(isp->dev, &isp->psy_desc, &psy_cfg);
	if (IS_ERR(isp->psy)) {
		ret = PTR_ERR(isp->psy);
		dev_err(&pdev->dev, "power_supply_register failed\n");
		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) {
		dev_err(&pdev->dev, "usb_register_notifier failed\n");
		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", },
	{ .compatible = "nxp,isp1707", },
	{},
};
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 {
297d716f KK	60	struct device *dev;
	61	struct power_supply *psy;
	62	struct power_supply_desc psy_desc;
	63	struct usb_phy *phy;
	64	struct notifier_block nb;
	65	struct work_struct work;
ec46475f	66
bac43b20	67	/* properties */
746d8fb8	68	char model[8];
ec46475f	69	unsigned present:1;
bac43b20 HK	70	unsigned online:1;
bac43b20 HK	71	unsigned current_max;
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
88025632	79	static inline int isp1704_write(struct isp1704_charger *isp, u32 reg, u32 val)
fcc8ebc9 HK	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	93	board->set_power(on);
34a10961 SR	94	else if (board)
34a10961 SR	95	gpio_set_value(board->enable_gpio, on);
2785cefc KJ	96	}
2785cefc KJ	97
bac43b20 HK	98	/*
	99	* Determine is the charging port DCP (dedicated charger) or CDP (Host/HUB
	100	* chargers).
	101	*
	102	* REVISIT: The method is defined in Battery Charging Specification and is
	103	* applicable to any ULPI transceiver. Nothing isp170x specific here.
	104	*/
	105	static inline int isp1704_charger_type(struct isp1704_charger *isp)
	106	{
	107	u8 reg;
	108	u8 func_ctrl;
	109	u8 otg_ctrl;
	110	int type = POWER_SUPPLY_TYPE_USB_DCP;
	111
fcc8ebc9 HK	112	func_ctrl = isp1704_read(isp, ULPI_FUNC_CTRL);
fcc8ebc9 HK	113	otg_ctrl = isp1704_read(isp, ULPI_OTG_CTRL);
bac43b20 HK	114
	115	/* disable pulldowns */
	116	reg = ULPI_OTG_CTRL_DM_PULLDOWN \| ULPI_OTG_CTRL_DP_PULLDOWN;
fcc8ebc9	117	isp1704_write(isp, ULPI_CLR(ULPI_OTG_CTRL), reg);
bac43b20 HK	118
bac43b20 HK	119	/* full speed */
fcc8ebc9	120	isp1704_write(isp, ULPI_CLR(ULPI_FUNC_CTRL),
bac43b20	121	ULPI_FUNC_CTRL_XCVRSEL_MASK);
fcc8ebc9	122	isp1704_write(isp, ULPI_SET(ULPI_FUNC_CTRL),
bac43b20 HK	123	ULPI_FUNC_CTRL_FULL_SPEED);
	124
	125	/* Enable strong pull-up on DP (1.5K) and reset */
	126	reg = ULPI_FUNC_CTRL_TERMSELECT \| ULPI_FUNC_CTRL_RESET;
fcc8ebc9	127	isp1704_write(isp, ULPI_SET(ULPI_FUNC_CTRL), reg);
bac43b20 HK	128	usleep_range(1000, 2000);
bac43b20 HK	129
fcc8ebc9	130	reg = isp1704_read(isp, ULPI_DEBUG);
bac43b20 HK	131	if ((reg & 3) != 3)
	132	type = POWER_SUPPLY_TYPE_USB_CDP;
	133
	134	/* recover original state */
fcc8ebc9 HK	135	isp1704_write(isp, ULPI_FUNC_CTRL, func_ctrl);
fcc8ebc9 HK	136	isp1704_write(isp, ULPI_OTG_CTRL, otg_ctrl);
bac43b20 HK	137
	138	return type;
	139	}
	140
ec46475f HK	141	/*
	142	* ISP1704 detects PS/2 adapters as charger. To make sure the detected charger
	143	* is actually a dedicated charger, the following steps need to be taken.
	144	*/
	145	static inline int isp1704_charger_verify(struct isp1704_charger *isp)
	146	{
	147	int ret = 0;
	148	u8 r;
	149
	150	/* Reset the transceiver */
fcc8ebc9	151	r = isp1704_read(isp, ULPI_FUNC_CTRL);
ec46475f	152	r \|= ULPI_FUNC_CTRL_RESET;
fcc8ebc9	153	isp1704_write(isp, ULPI_FUNC_CTRL, r);
ec46475f HK	154	usleep_range(1000, 2000);
	155
	156	/* Set normal mode */
	157	r &= ~(ULPI_FUNC_CTRL_RESET \| ULPI_FUNC_CTRL_OPMODE_MASK);
fcc8ebc9	158	isp1704_write(isp, ULPI_FUNC_CTRL, r);
ec46475f HK	159
	160	/* Clear the DP and DM pull-down bits */
	161	r = ULPI_OTG_CTRL_DP_PULLDOWN \| ULPI_OTG_CTRL_DM_PULLDOWN;
fcc8ebc9	162	isp1704_write(isp, ULPI_CLR(ULPI_OTG_CTRL), r);
ec46475f HK	163
	164	/* Enable strong pull-up on DP (1.5K) and reset */
	165	r = ULPI_FUNC_CTRL_TERMSELECT \| ULPI_FUNC_CTRL_RESET;
fcc8ebc9	166	isp1704_write(isp, ULPI_SET(ULPI_FUNC_CTRL), r);
ec46475f HK	167	usleep_range(1000, 2000);
	168
	169	/* Read the line state */
fcc8ebc9	170	if (!isp1704_read(isp, ULPI_DEBUG)) {
ec46475f	171	/* Disable strong pull-up on DP (1.5K) */
fcc8ebc9	172	isp1704_write(isp, ULPI_CLR(ULPI_FUNC_CTRL),
ec46475f HK	173	ULPI_FUNC_CTRL_TERMSELECT);
	174	return 1;
	175	}
	176
	177	/* Is it a charger or PS/2 connection */
	178
	179	/* Enable weak pull-up resistor on DP */
fcc8ebc9	180	isp1704_write(isp, ULPI_SET(ISP1704_PWR_CTRL),
ec46475f HK	181	ISP1704_PWR_CTRL_DP_WKPU_EN);
	182
	183	/* Disable strong pull-up on DP (1.5K) */
fcc8ebc9	184	isp1704_write(isp, ULPI_CLR(ULPI_FUNC_CTRL),
ec46475f HK	185	ULPI_FUNC_CTRL_TERMSELECT);
	186
	187	/* Enable weak pull-down resistor on DM */
fcc8ebc9	188	isp1704_write(isp, ULPI_SET(ULPI_OTG_CTRL),
ec46475f HK	189	ULPI_OTG_CTRL_DM_PULLDOWN);
	190
	191	/* It's a charger if the line states are clear */
fcc8ebc9	192	if (!(isp1704_read(isp, ULPI_DEBUG)))
ec46475f HK	193	ret = 1;
	194
	195	/* Disable weak pull-up resistor on DP */
fcc8ebc9	196	isp1704_write(isp, ULPI_CLR(ISP1704_PWR_CTRL),
ec46475f HK	197	ISP1704_PWR_CTRL_DP_WKPU_EN);
	198
	199	return ret;
	200	}
	201
	202	static inline int isp1704_charger_detect(struct isp1704_charger *isp)
	203	{
	204	unsigned long timeout;
bac43b20	205	u8 pwr_ctrl;
ec46475f HK	206	int ret = 0;
ec46475f HK	207
fcc8ebc9	208	pwr_ctrl = isp1704_read(isp, ISP1704_PWR_CTRL);
bac43b20	209
ec46475f	210	/* set SW control bit in PWR_CTRL register */
fcc8ebc9	211	isp1704_write(isp, ISP1704_PWR_CTRL,
ec46475f HK	212	ISP1704_PWR_CTRL_SWCTRL);
	213
	214	/* enable manual charger detection */
fcc8ebc9	215	isp1704_write(isp, ULPI_SET(ISP1704_PWR_CTRL),
bac43b20 HK	216	ISP1704_PWR_CTRL_SWCTRL
bac43b20 HK	217	\| ISP1704_PWR_CTRL_DPVSRC_EN);
ec46475f HK	218	usleep_range(1000, 2000);
	219
	220	timeout = jiffies + msecs_to_jiffies(300);
	221	do {
	222	/* Check if there is a charger */
fcc8ebc9	223	if (isp1704_read(isp, ISP1704_PWR_CTRL)
ec46475f HK	224	& ISP1704_PWR_CTRL_VDAT_DET) {
	225	ret = isp1704_charger_verify(isp);
	226	break;
	227	}
bac43b20 HK	228	} while (!time_after(jiffies, timeout) && isp->online);
	229
	230	/* recover original state */
fcc8ebc9	231	isp1704_write(isp, ISP1704_PWR_CTRL, pwr_ctrl);
ec46475f HK	232
	233	return ret;
	234	}
	235
f07c11ea PR	236	static inline int isp1704_charger_detect_dcp(struct isp1704_charger *isp)
	237	{
	238	if (isp1704_charger_detect(isp) &&
	239	isp1704_charger_type(isp) == POWER_SUPPLY_TYPE_USB_DCP)
	240	return true;
	241	else
	242	return false;
	243	}
	244
ec46475f HK	245	static void isp1704_charger_work(struct work_struct *data)
ec46475f HK	246	{
ec46475f HK	247	struct isp1704_charger *isp =
ec46475f HK	248	container_of(data, struct isp1704_charger, work);
bac43b20	249	static DEFINE_MUTEX(lock);
ec46475f	250
bac43b20	251	mutex_lock(&lock);
ec46475f	252
f07c11ea	253	switch (isp->phy->last_event) {
ec46475f	254	case USB_EVENT_VBUS:
f07c11ea PR	255	/* do not call wall charger detection more times */
	256	if (!isp->present) {
	257	isp->online = true;
	258	isp->present = 1;
	259	isp1704_charger_set_power(isp, 1);
	260
	261	/* detect wall charger */
	262	if (isp1704_charger_detect_dcp(isp)) {
297d716f	263	isp->psy_desc.type = POWER_SUPPLY_TYPE_USB_DCP;
f07c11ea PR	264	isp->current_max = 1800;
f07c11ea PR	265	} else {
297d716f	266	isp->psy_desc.type = POWER_SUPPLY_TYPE_USB;
f07c11ea PR	267	isp->current_max = 500;
f07c11ea PR	268	}
bac43b20	269
f07c11ea PR	270	/* enable data pullups */
	271	if (isp->phy->otg->gadget)
	272	usb_gadget_connect(isp->phy->otg->gadget);
bac43b20 HK	273	}
bac43b20 HK	274
297d716f	275	if (isp->psy_desc.type != POWER_SUPPLY_TYPE_USB_DCP) {
bac43b20 HK	276	/*
	277	* Only 500mA here or high speed chirp
	278	* handshaking may break
	279	*/
f07c11ea PR	280	if (isp->current_max > 500)
	281	isp->current_max = 500;
	282
	283	if (isp->current_max > 100)
297d716f	284	isp->psy_desc.type = POWER_SUPPLY_TYPE_USB_CDP;
bac43b20	285	}
ec46475f HK	286	break;
ec46475f HK	287	case USB_EVENT_NONE:
bac43b20	288	isp->online = false;
bac43b20 HK	289	isp->present = 0;
bac43b20 HK	290	isp->current_max = 0;
297d716f	291	isp->psy_desc.type = POWER_SUPPLY_TYPE_USB;
bac43b20 HK	292
	293	/*
	294	* Disable data pullups. We need to prevent the controller from
	295	* enumerating.
	296	*
	297	* FIXME: This is here to allow charger detection with Host/HUB
	298	* chargers. The pullups may be enabled elsewhere, so this can
	299	* not be the final solution.
	300	*/
b1c711d6 HK	301	if (isp->phy->otg->gadget)
b1c711d6 HK	302	usb_gadget_disconnect(isp->phy->otg->gadget);
2785cefc KJ	303
2785cefc KJ	304	isp1704_charger_set_power(isp, 0);
bac43b20	305	break;
ec46475f	306	default:
bac43b20	307	goto out;
ec46475f HK	308	}
ec46475f HK	309
297d716f	310	power_supply_changed(isp->psy);
bac43b20 HK	311	out:
	312	mutex_unlock(&lock);
	313	}
	314
	315	static int isp1704_notifier_call(struct notifier_block *nb,
f07c11ea	316	unsigned long val, void *v)
bac43b20 HK	317	{
	318	struct isp1704_charger *isp =
	319	container_of(nb, struct isp1704_charger, nb);
	320
bac43b20 HK	321	schedule_work(&isp->work);
bac43b20 HK	322
ec46475f HK	323	return NOTIFY_OK;
	324	}
	325
	326	static int isp1704_charger_get_property(struct power_supply *psy,
	327	enum power_supply_property psp,
	328	union power_supply_propval *val)
	329	{
297d716f	330	struct isp1704_charger *isp = power_supply_get_drvdata(psy);
ec46475f HK	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;
297d716f	406	struct power_supply_config psy_cfg = {};
ec46475f	407
34a10961 SR	408	struct isp1704_charger_data *pdata = dev_get_platdata(&pdev->dev);
	409	struct device_node *np = pdev->dev.of_node;
	410
	411	if (np) {
	412	int gpio = of_get_named_gpio(np, "nxp,enable-gpio", 0);
	413
ed6107be PR	414	if (gpio < 0) {
ed6107be PR	415	dev_err(&pdev->dev, "missing DT GPIO nxp,enable-gpio\n");
34a10961	416	return gpio;
ed6107be	417	}
34a10961 SR	418
	419	pdata = devm_kzalloc(&pdev->dev,
	420	sizeof(struct isp1704_charger_data), GFP_KERNEL);
	421	pdata->enable_gpio = gpio;
	422
	423	dev_info(&pdev->dev, "init gpio %d\n", pdata->enable_gpio);
	424
	425	ret = devm_gpio_request_one(&pdev->dev, pdata->enable_gpio,
	426	GPIOF_OUT_INIT_HIGH, "isp1704_reset");
ed6107be PR	427	if (ret) {
ed6107be PR	428	dev_err(&pdev->dev, "gpio request failed\n");
34a10961	429	goto fail0;
ed6107be	430	}
34a10961 SR	431	}
	432
	433	if (!pdata) {
	434	dev_err(&pdev->dev, "missing platform data!\n");
	435	return -ENODEV;
	436	}
	437
	438
2a2ce52a	439	isp = devm_kzalloc(&pdev->dev, sizeof(*isp), GFP_KERNEL);
ec46475f HK	440	if (!isp)
	441	return -ENOMEM;
	442
34a10961 SR	443	if (np)
	444	isp->phy = devm_usb_get_phy_by_phandle(&pdev->dev, "usb-phy", 0);
	445	else
	446	isp->phy = devm_usb_get_phy(&pdev->dev, USB_PHY_TYPE_USB2);
	447
	448	if (IS_ERR(isp->phy)) {
	449	ret = PTR_ERR(isp->phy);
ed6107be	450	dev_err(&pdev->dev, "usb_get_phy failed\n");
34a10961 SR	451	goto fail0;
34a10961 SR	452	}
ec46475f	453
a4607d9f HK	454	isp->dev = &pdev->dev;
	455	platform_set_drvdata(pdev, isp);
	456
2785cefc KJ	457	isp1704_charger_set_power(isp, 1);
2785cefc KJ	458
ec46475f	459	ret = isp1704_test_ulpi(isp);
ed6107be PR	460	if (ret < 0) {
ed6107be PR	461	dev_err(&pdev->dev, "isp1704_test_ulpi failed\n");
ec46475f	462	goto fail1;
ed6107be	463	}
ec46475f	464
297d716f KK	465	isp->psy_desc.name = "isp1704";
	466	isp->psy_desc.type = POWER_SUPPLY_TYPE_USB;
	467	isp->psy_desc.properties = power_props;
	468	isp->psy_desc.num_properties = ARRAY_SIZE(power_props);
	469	isp->psy_desc.get_property = isp1704_charger_get_property;
ec46475f	470
297d716f KK	471	psy_cfg.drv_data = isp;
	472
	473	isp->psy = power_supply_register(isp->dev, &isp->psy_desc, &psy_cfg);
	474	if (IS_ERR(isp->psy)) {
	475	ret = PTR_ERR(isp->psy);
ed6107be	476	dev_err(&pdev->dev, "power_supply_register failed\n");
ec46475f	477	goto fail1;
297d716f	478	}
ec46475f HK	479
ec46475f HK	480	/*
fcc8ebc9	481	* REVISIT: using work in order to allow the usb notifications to be
ec46475f HK	482	* made atomically in the future.
	483	*/
	484	INIT_WORK(&isp->work, isp1704_charger_work);
	485
	486	isp->nb.notifier_call = isp1704_notifier_call;
	487
fcc8ebc9	488	ret = usb_register_notifier(isp->phy, &isp->nb);
ed6107be PR	489	if (ret) {
ed6107be PR	490	dev_err(&pdev->dev, "usb_register_notifier failed\n");
ec46475f	491	goto fail2;
ed6107be	492	}
ec46475f HK	493
	494	dev_info(isp->dev, "registered with product id %s\n", isp->model);
	495
e1a85694 HK	496	/*
	497	* Taking over the D+ pullup.
	498	*
	499	* FIXME: The device will be disconnected if it was already
	500	* enumerated. The charger driver should be always loaded before any
	501	* gadget is loaded.
	502	*/
b1c711d6 HK	503	if (isp->phy->otg->gadget)
b1c711d6 HK	504	usb_gadget_disconnect(isp->phy->otg->gadget);
e1a85694	505
f07c11ea PR	506	if (isp->phy->last_event == USB_EVENT_NONE)
	507	isp1704_charger_set_power(isp, 0);
	508
e1a85694	509	/* Detect charger if VBUS is valid (the cable was already plugged). */
f07c11ea PR	510	if (isp->phy->last_event == USB_EVENT_VBUS &&
f07c11ea PR	511	!isp->phy->otg->default_a)
e1a85694	512	schedule_work(&isp->work);
e1a85694	513
ec46475f HK	514	return 0;
ec46475f HK	515	fail2:
297d716f	516	power_supply_unregister(isp->psy);
ec46475f	517	fail1:
81a08382	518	isp1704_charger_set_power(isp, 0);
ec46475f	519	fail0:
ec46475f HK	520	dev_err(&pdev->dev, "failed to register isp1704 with error %d\n", ret);
	521
	522	return ret;
	523	}
	524
415ec69f	525	static int isp1704_charger_remove(struct platform_device *pdev)
ec46475f HK	526	{
	527	struct isp1704_charger *isp = platform_get_drvdata(pdev);
	528
fcc8ebc9	529	usb_unregister_notifier(isp->phy, &isp->nb);
297d716f	530	power_supply_unregister(isp->psy);
2785cefc	531	isp1704_charger_set_power(isp, 0);
ec46475f HK	532
	533	return 0;
	534	}
	535
34a10961 SR	536	#ifdef CONFIG_OF
	537	static const struct of_device_id omap_isp1704_of_match[] = {
	538	{ .compatible = "nxp,isp1704", },
64876fe5	539	{ .compatible = "nxp,isp1707", },
34a10961 SR	540	{},
	541	};
	542	MODULE_DEVICE_TABLE(of, omap_isp1704_of_match);
	543	#endif
	544
ec46475f HK	545	static struct platform_driver isp1704_charger_driver = {
	546	.driver = {
	547	.name = "isp1704_charger",
34a10961	548	.of_match_table = of_match_ptr(omap_isp1704_of_match),
ec46475f HK	549	},
ec46475f HK	550	.probe = isp1704_charger_probe,
28ea73f4	551	.remove = isp1704_charger_remove,
ec46475f HK	552	};
ec46475f HK	553
300bac7f	554	module_platform_driver(isp1704_charger_driver);
ec46475f HK	555
	556	MODULE_ALIAS("platform:isp1704_charger");
	557	MODULE_AUTHOR("Nokia Corporation");
	558	MODULE_DESCRIPTION("ISP170x USB Charger driver");
	559	MODULE_LICENSE("GPL");