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

// SPDX-License-Identifier: GPL-2.0-or-later
/*
 * ISP1704 USB Charger Detection driver
 *
 * Copyright (C) 2010 Nokia Corporation
 * Copyright (C) 2012 - 2013 Pali Rohár <pali.rohar@gmail.com>
 */

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

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

#define NXP_VENDOR_ID			0x04cc

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

struct isp1704_charger {
	struct device			*dev;
	struct power_supply		*psy;
	struct power_supply_desc	psy_desc;
	struct gpio_desc		*enable_gpio;
	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);
}

static void isp1704_charger_set_power(struct isp1704_charger *isp, bool on)
{
	gpiod_set_value(isp->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 = {};

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

	isp->enable_gpio = devm_gpiod_get(&pdev->dev, "nxp,enable",
					  GPIOD_OUT_HIGH);
	if (IS_ERR(isp->enable_gpio)) {
		ret = PTR_ERR(isp->enable_gpio);
		dev_err(&pdev->dev, "Could not get reset gpio: %d\n", ret);
		return ret;
	}

	if (pdev->dev.of_node)
		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
1a59d1b8	1	// SPDX-License-Identifier: GPL-2.0-or-later
ec46475f HK	2	/*
	3	* ISP1704 USB Charger Detection driver
	4	*
	5	* Copyright (C) 2010 Nokia Corporation
f07c11ea	6	* Copyright (C) 2012 - 2013 Pali Rohár <pali.rohar@gmail.com>
ec46475f HK	7	*/
	8
	9	#include <linux/kernel.h>
	10	#include <linux/module.h>
	11	#include <linux/err.h>
	12	#include <linux/init.h>
	13	#include <linux/types.h>
	14	#include <linux/device.h>
	15	#include <linux/sysfs.h>
	16	#include <linux/platform_device.h>
	17	#include <linux/power_supply.h>
	18	#include <linux/delay.h>
34a10961	19	#include <linux/of.h>
ec46475f	20
f5d782d4	21	#include <linux/gpio/consumer.h>
ec46475f HK	22	#include <linux/usb/otg.h>
	23	#include <linux/usb/ulpi.h>
	24	#include <linux/usb/ch9.h>
	25	#include <linux/usb/gadget.h>
	26
	27	/* Vendor specific Power Control register */
	28	#define ISP1704_PWR_CTRL 0x3d
	29	#define ISP1704_PWR_CTRL_SWCTRL (1 << 0)
	30	#define ISP1704_PWR_CTRL_DET_COMP (1 << 1)
	31	#define ISP1704_PWR_CTRL_BVALID_RISE (1 << 2)
	32	#define ISP1704_PWR_CTRL_BVALID_FALL (1 << 3)
	33	#define ISP1704_PWR_CTRL_DP_WKPU_EN (1 << 4)
	34	#define ISP1704_PWR_CTRL_VDAT_DET (1 << 5)
	35	#define ISP1704_PWR_CTRL_DPVSRC_EN (1 << 6)
	36	#define ISP1704_PWR_CTRL_HWDETECT (1 << 7)
	37
	38	#define NXP_VENDOR_ID 0x04cc
	39
	40	static u16 isp170x_id[] = {
	41	0x1704,
	42	0x1707,
	43	};
	44
	45	struct isp1704_charger {
297d716f KK	46	struct device *dev;
	47	struct power_supply *psy;
	48	struct power_supply_desc psy_desc;
f5d782d4	49	struct gpio_desc *enable_gpio;
297d716f KK	50	struct usb_phy *phy;
	51	struct notifier_block nb;
	52	struct work_struct work;
ec46475f	53
bac43b20	54	/* properties */
746d8fb8	55	char model[8];
ec46475f	56	unsigned present:1;
bac43b20 HK	57	unsigned online:1;
bac43b20 HK	58	unsigned current_max;
ec46475f HK	59	};
ec46475f HK	60
fcc8ebc9 HK	61	static inline int isp1704_read(struct isp1704_charger *isp, u32 reg)
	62	{
	63	return usb_phy_io_read(isp->phy, reg);
	64	}
	65
88025632	66	static inline int isp1704_write(struct isp1704_charger *isp, u32 reg, u32 val)
fcc8ebc9 HK	67	{
	68	return usb_phy_io_write(isp->phy, val, reg);
	69	}
	70
2785cefc KJ	71	static void isp1704_charger_set_power(struct isp1704_charger *isp, bool on)
2785cefc KJ	72	{
f5d782d4	73	gpiod_set_value(isp->enable_gpio, on);
2785cefc KJ	74	}
2785cefc KJ	75
bac43b20 HK	76	/*
	77	* Determine is the charging port DCP (dedicated charger) or CDP (Host/HUB
	78	* chargers).
	79	*
	80	* REVISIT: The method is defined in Battery Charging Specification and is
	81	* applicable to any ULPI transceiver. Nothing isp170x specific here.
	82	*/
	83	static inline int isp1704_charger_type(struct isp1704_charger *isp)
	84	{
	85	u8 reg;
	86	u8 func_ctrl;
	87	u8 otg_ctrl;
	88	int type = POWER_SUPPLY_TYPE_USB_DCP;
	89
fcc8ebc9 HK	90	func_ctrl = isp1704_read(isp, ULPI_FUNC_CTRL);
fcc8ebc9 HK	91	otg_ctrl = isp1704_read(isp, ULPI_OTG_CTRL);
bac43b20 HK	92
	93	/* disable pulldowns */
	94	reg = ULPI_OTG_CTRL_DM_PULLDOWN \| ULPI_OTG_CTRL_DP_PULLDOWN;
fcc8ebc9	95	isp1704_write(isp, ULPI_CLR(ULPI_OTG_CTRL), reg);
bac43b20 HK	96
bac43b20 HK	97	/* full speed */
fcc8ebc9	98	isp1704_write(isp, ULPI_CLR(ULPI_FUNC_CTRL),
bac43b20	99	ULPI_FUNC_CTRL_XCVRSEL_MASK);
fcc8ebc9	100	isp1704_write(isp, ULPI_SET(ULPI_FUNC_CTRL),
bac43b20 HK	101	ULPI_FUNC_CTRL_FULL_SPEED);
	102
	103	/* Enable strong pull-up on DP (1.5K) and reset */
	104	reg = ULPI_FUNC_CTRL_TERMSELECT \| ULPI_FUNC_CTRL_RESET;
fcc8ebc9	105	isp1704_write(isp, ULPI_SET(ULPI_FUNC_CTRL), reg);
bac43b20 HK	106	usleep_range(1000, 2000);
bac43b20 HK	107
fcc8ebc9	108	reg = isp1704_read(isp, ULPI_DEBUG);
bac43b20 HK	109	if ((reg & 3) != 3)
	110	type = POWER_SUPPLY_TYPE_USB_CDP;
	111
	112	/* recover original state */
fcc8ebc9 HK	113	isp1704_write(isp, ULPI_FUNC_CTRL, func_ctrl);
fcc8ebc9 HK	114	isp1704_write(isp, ULPI_OTG_CTRL, otg_ctrl);
bac43b20 HK	115
	116	return type;
	117	}
	118
ec46475f HK	119	/*
	120	* ISP1704 detects PS/2 adapters as charger. To make sure the detected charger
	121	* is actually a dedicated charger, the following steps need to be taken.
	122	*/
	123	static inline int isp1704_charger_verify(struct isp1704_charger *isp)
	124	{
	125	int ret = 0;
	126	u8 r;
	127
	128	/* Reset the transceiver */
fcc8ebc9	129	r = isp1704_read(isp, ULPI_FUNC_CTRL);
ec46475f	130	r \|= ULPI_FUNC_CTRL_RESET;
fcc8ebc9	131	isp1704_write(isp, ULPI_FUNC_CTRL, r);
ec46475f HK	132	usleep_range(1000, 2000);
	133
	134	/* Set normal mode */
	135	r &= ~(ULPI_FUNC_CTRL_RESET \| ULPI_FUNC_CTRL_OPMODE_MASK);
fcc8ebc9	136	isp1704_write(isp, ULPI_FUNC_CTRL, r);
ec46475f HK	137
	138	/* Clear the DP and DM pull-down bits */
	139	r = ULPI_OTG_CTRL_DP_PULLDOWN \| ULPI_OTG_CTRL_DM_PULLDOWN;
fcc8ebc9	140	isp1704_write(isp, ULPI_CLR(ULPI_OTG_CTRL), r);
ec46475f HK	141
	142	/* Enable strong pull-up on DP (1.5K) and reset */
	143	r = ULPI_FUNC_CTRL_TERMSELECT \| ULPI_FUNC_CTRL_RESET;
fcc8ebc9	144	isp1704_write(isp, ULPI_SET(ULPI_FUNC_CTRL), r);
ec46475f HK	145	usleep_range(1000, 2000);
	146
	147	/* Read the line state */
fcc8ebc9	148	if (!isp1704_read(isp, ULPI_DEBUG)) {
ec46475f	149	/* Disable strong pull-up on DP (1.5K) */
fcc8ebc9	150	isp1704_write(isp, ULPI_CLR(ULPI_FUNC_CTRL),
ec46475f HK	151	ULPI_FUNC_CTRL_TERMSELECT);
	152	return 1;
	153	}
	154
	155	/* Is it a charger or PS/2 connection */
	156
	157	/* Enable weak pull-up resistor on DP */
fcc8ebc9	158	isp1704_write(isp, ULPI_SET(ISP1704_PWR_CTRL),
ec46475f HK	159	ISP1704_PWR_CTRL_DP_WKPU_EN);
	160
	161	/* Disable strong pull-up on DP (1.5K) */
fcc8ebc9	162	isp1704_write(isp, ULPI_CLR(ULPI_FUNC_CTRL),
ec46475f HK	163	ULPI_FUNC_CTRL_TERMSELECT);
	164
	165	/* Enable weak pull-down resistor on DM */
fcc8ebc9	166	isp1704_write(isp, ULPI_SET(ULPI_OTG_CTRL),
ec46475f HK	167	ULPI_OTG_CTRL_DM_PULLDOWN);
	168
	169	/* It's a charger if the line states are clear */
fcc8ebc9	170	if (!(isp1704_read(isp, ULPI_DEBUG)))
ec46475f HK	171	ret = 1;
	172
	173	/* Disable weak pull-up resistor on DP */
fcc8ebc9	174	isp1704_write(isp, ULPI_CLR(ISP1704_PWR_CTRL),
ec46475f HK	175	ISP1704_PWR_CTRL_DP_WKPU_EN);
	176
	177	return ret;
	178	}
	179
	180	static inline int isp1704_charger_detect(struct isp1704_charger *isp)
	181	{
	182	unsigned long timeout;
bac43b20	183	u8 pwr_ctrl;
ec46475f HK	184	int ret = 0;
ec46475f HK	185
fcc8ebc9	186	pwr_ctrl = isp1704_read(isp, ISP1704_PWR_CTRL);
bac43b20	187
ec46475f	188	/* set SW control bit in PWR_CTRL register */
fcc8ebc9	189	isp1704_write(isp, ISP1704_PWR_CTRL,
ec46475f HK	190	ISP1704_PWR_CTRL_SWCTRL);
	191
	192	/* enable manual charger detection */
fcc8ebc9	193	isp1704_write(isp, ULPI_SET(ISP1704_PWR_CTRL),
bac43b20 HK	194	ISP1704_PWR_CTRL_SWCTRL
bac43b20 HK	195	\| ISP1704_PWR_CTRL_DPVSRC_EN);
ec46475f HK	196	usleep_range(1000, 2000);
	197
	198	timeout = jiffies + msecs_to_jiffies(300);
	199	do {
	200	/* Check if there is a charger */
fcc8ebc9	201	if (isp1704_read(isp, ISP1704_PWR_CTRL)
ec46475f HK	202	& ISP1704_PWR_CTRL_VDAT_DET) {
	203	ret = isp1704_charger_verify(isp);
	204	break;
	205	}
bac43b20 HK	206	} while (!time_after(jiffies, timeout) && isp->online);
	207
	208	/* recover original state */
fcc8ebc9	209	isp1704_write(isp, ISP1704_PWR_CTRL, pwr_ctrl);
ec46475f HK	210
	211	return ret;
	212	}
	213
f07c11ea PR	214	static inline int isp1704_charger_detect_dcp(struct isp1704_charger *isp)
	215	{
	216	if (isp1704_charger_detect(isp) &&
	217	isp1704_charger_type(isp) == POWER_SUPPLY_TYPE_USB_DCP)
	218	return true;
	219	else
	220	return false;
	221	}
	222
ec46475f HK	223	static void isp1704_charger_work(struct work_struct *data)
ec46475f HK	224	{
ec46475f HK	225	struct isp1704_charger *isp =
ec46475f HK	226	container_of(data, struct isp1704_charger, work);
bac43b20	227	static DEFINE_MUTEX(lock);
ec46475f	228
bac43b20	229	mutex_lock(&lock);
ec46475f	230
f07c11ea	231	switch (isp->phy->last_event) {
ec46475f	232	case USB_EVENT_VBUS:
f07c11ea PR	233	/* do not call wall charger detection more times */
	234	if (!isp->present) {
	235	isp->online = true;
	236	isp->present = 1;
	237	isp1704_charger_set_power(isp, 1);
	238
	239	/* detect wall charger */
	240	if (isp1704_charger_detect_dcp(isp)) {
297d716f	241	isp->psy_desc.type = POWER_SUPPLY_TYPE_USB_DCP;
f07c11ea PR	242	isp->current_max = 1800;
f07c11ea PR	243	} else {
297d716f	244	isp->psy_desc.type = POWER_SUPPLY_TYPE_USB;
f07c11ea PR	245	isp->current_max = 500;
f07c11ea PR	246	}
bac43b20	247
f07c11ea PR	248	/* enable data pullups */
	249	if (isp->phy->otg->gadget)
	250	usb_gadget_connect(isp->phy->otg->gadget);
bac43b20 HK	251	}
bac43b20 HK	252
297d716f	253	if (isp->psy_desc.type != POWER_SUPPLY_TYPE_USB_DCP) {
bac43b20 HK	254	/*
	255	* Only 500mA here or high speed chirp
	256	* handshaking may break
	257	*/
f07c11ea PR	258	if (isp->current_max > 500)
	259	isp->current_max = 500;
	260
	261	if (isp->current_max > 100)
297d716f	262	isp->psy_desc.type = POWER_SUPPLY_TYPE_USB_CDP;
bac43b20	263	}
ec46475f HK	264	break;
ec46475f HK	265	case USB_EVENT_NONE:
bac43b20	266	isp->online = false;
bac43b20 HK	267	isp->present = 0;
bac43b20 HK	268	isp->current_max = 0;
297d716f	269	isp->psy_desc.type = POWER_SUPPLY_TYPE_USB;
bac43b20 HK	270
	271	/*
	272	* Disable data pullups. We need to prevent the controller from
	273	* enumerating.
	274	*
	275	* FIXME: This is here to allow charger detection with Host/HUB
	276	* chargers. The pullups may be enabled elsewhere, so this can
	277	* not be the final solution.
	278	*/
b1c711d6 HK	279	if (isp->phy->otg->gadget)
b1c711d6 HK	280	usb_gadget_disconnect(isp->phy->otg->gadget);
2785cefc KJ	281
2785cefc KJ	282	isp1704_charger_set_power(isp, 0);
bac43b20	283	break;
ec46475f	284	default:
bac43b20	285	goto out;
ec46475f HK	286	}
ec46475f HK	287
297d716f	288	power_supply_changed(isp->psy);
bac43b20 HK	289	out:
	290	mutex_unlock(&lock);
	291	}
	292
	293	static int isp1704_notifier_call(struct notifier_block *nb,
f07c11ea	294	unsigned long val, void *v)
bac43b20 HK	295	{
	296	struct isp1704_charger *isp =
	297	container_of(nb, struct isp1704_charger, nb);
	298
bac43b20 HK	299	schedule_work(&isp->work);
bac43b20 HK	300
ec46475f HK	301	return NOTIFY_OK;
	302	}
	303
	304	static int isp1704_charger_get_property(struct power_supply *psy,
	305	enum power_supply_property psp,
	306	union power_supply_propval *val)
	307	{
297d716f	308	struct isp1704_charger *isp = power_supply_get_drvdata(psy);
ec46475f HK	309
	310	switch (psp) {
	311	case POWER_SUPPLY_PROP_PRESENT:
	312	val->intval = isp->present;
	313	break;
bac43b20 HK	314	case POWER_SUPPLY_PROP_ONLINE:
	315	val->intval = isp->online;
	316	break;
	317	case POWER_SUPPLY_PROP_CURRENT_MAX:
	318	val->intval = isp->current_max;
	319	break;
ec46475f HK	320	case POWER_SUPPLY_PROP_MODEL_NAME:
	321	val->strval = isp->model;
	322	break;
	323	case POWER_SUPPLY_PROP_MANUFACTURER:
	324	val->strval = "NXP";
	325	break;
	326	default:
	327	return -EINVAL;
	328	}
	329	return 0;
	330	}
	331
	332	static enum power_supply_property power_props[] = {
	333	POWER_SUPPLY_PROP_PRESENT,
bac43b20 HK	334	POWER_SUPPLY_PROP_ONLINE,
bac43b20 HK	335	POWER_SUPPLY_PROP_CURRENT_MAX,
ec46475f HK	336	POWER_SUPPLY_PROP_MODEL_NAME,
	337	POWER_SUPPLY_PROP_MANUFACTURER,
	338	};
	339
	340	static inline int isp1704_test_ulpi(struct isp1704_charger *isp)
	341	{
	342	int vendor;
	343	int product;
	344	int i;
	345	int ret = -ENODEV;
	346
	347	/* Test ULPI interface */
fcc8ebc9	348	ret = isp1704_write(isp, ULPI_SCRATCH, 0xaa);
ec46475f HK	349	if (ret < 0)
	350	return ret;
	351
fcc8ebc9	352	ret = isp1704_read(isp, ULPI_SCRATCH);
ec46475f HK	353	if (ret < 0)
	354	return ret;
	355
	356	if (ret != 0xaa)
	357	return -ENODEV;
	358
	359	/* Verify the product and vendor id matches */
fcc8ebc9 HK	360	vendor = isp1704_read(isp, ULPI_VENDOR_ID_LOW);
fcc8ebc9 HK	361	vendor \|= isp1704_read(isp, ULPI_VENDOR_ID_HIGH) << 8;
ec46475f HK	362	if (vendor != NXP_VENDOR_ID)
	363	return -ENODEV;
	364
fcc8ebc9 HK	365	product = isp1704_read(isp, ULPI_PRODUCT_ID_LOW);
fcc8ebc9 HK	366	product \|= isp1704_read(isp, ULPI_PRODUCT_ID_HIGH) << 8;
ec46475f HK	367
	368	for (i = 0; i < ARRAY_SIZE(isp170x_id); i++) {
	369	if (product == isp170x_id[i]) {
	370	sprintf(isp->model, "isp%x", product);
	371	return product;
	372	}
	373	}
	374
	375	dev_err(isp->dev, "product id %x not matching known ids", product);
	376
	377	return -ENODEV;
	378	}
	379
c8afa640	380	static int isp1704_charger_probe(struct platform_device *pdev)
ec46475f HK	381	{
	382	struct isp1704_charger *isp;
	383	int ret = -ENODEV;
297d716f	384	struct power_supply_config psy_cfg = {};
ec46475f	385
2a2ce52a	386	isp = devm_kzalloc(&pdev->dev, sizeof(*isp), GFP_KERNEL);
ec46475f HK	387	if (!isp)
	388	return -ENOMEM;
	389
f5d782d4 SR	390	isp->enable_gpio = devm_gpiod_get(&pdev->dev, "nxp,enable",
	391	GPIOD_OUT_HIGH);
	392	if (IS_ERR(isp->enable_gpio)) {
	393	ret = PTR_ERR(isp->enable_gpio);
	394	dev_err(&pdev->dev, "Could not get reset gpio: %d\n", ret);
	395	return ret;
	396	}
	397
	398	if (pdev->dev.of_node)
34a10961 SR	399	isp->phy = devm_usb_get_phy_by_phandle(&pdev->dev, "usb-phy", 0);
	400	else
	401	isp->phy = devm_usb_get_phy(&pdev->dev, USB_PHY_TYPE_USB2);
	402
	403	if (IS_ERR(isp->phy)) {
	404	ret = PTR_ERR(isp->phy);
ed6107be	405	dev_err(&pdev->dev, "usb_get_phy failed\n");
34a10961 SR	406	goto fail0;
34a10961 SR	407	}
ec46475f	408
a4607d9f HK	409	isp->dev = &pdev->dev;
	410	platform_set_drvdata(pdev, isp);
	411
2785cefc KJ	412	isp1704_charger_set_power(isp, 1);
2785cefc KJ	413
ec46475f	414	ret = isp1704_test_ulpi(isp);
ed6107be PR	415	if (ret < 0) {
ed6107be PR	416	dev_err(&pdev->dev, "isp1704_test_ulpi failed\n");
ec46475f	417	goto fail1;
ed6107be	418	}
ec46475f	419
297d716f KK	420	isp->psy_desc.name = "isp1704";
	421	isp->psy_desc.type = POWER_SUPPLY_TYPE_USB;
	422	isp->psy_desc.properties = power_props;
	423	isp->psy_desc.num_properties = ARRAY_SIZE(power_props);
	424	isp->psy_desc.get_property = isp1704_charger_get_property;
ec46475f	425
297d716f KK	426	psy_cfg.drv_data = isp;
	427
	428	isp->psy = power_supply_register(isp->dev, &isp->psy_desc, &psy_cfg);
	429	if (IS_ERR(isp->psy)) {
	430	ret = PTR_ERR(isp->psy);
ed6107be	431	dev_err(&pdev->dev, "power_supply_register failed\n");
ec46475f	432	goto fail1;
297d716f	433	}
ec46475f HK	434
ec46475f HK	435	/*
fcc8ebc9	436	* REVISIT: using work in order to allow the usb notifications to be
ec46475f HK	437	* made atomically in the future.
	438	*/
	439	INIT_WORK(&isp->work, isp1704_charger_work);
	440
	441	isp->nb.notifier_call = isp1704_notifier_call;
	442
fcc8ebc9	443	ret = usb_register_notifier(isp->phy, &isp->nb);
ed6107be PR	444	if (ret) {
ed6107be PR	445	dev_err(&pdev->dev, "usb_register_notifier failed\n");
ec46475f	446	goto fail2;
ed6107be	447	}
ec46475f HK	448
	449	dev_info(isp->dev, "registered with product id %s\n", isp->model);
	450
e1a85694 HK	451	/*
	452	* Taking over the D+ pullup.
	453	*
	454	* FIXME: The device will be disconnected if it was already
	455	* enumerated. The charger driver should be always loaded before any
	456	* gadget is loaded.
	457	*/
b1c711d6 HK	458	if (isp->phy->otg->gadget)
b1c711d6 HK	459	usb_gadget_disconnect(isp->phy->otg->gadget);
e1a85694	460
f07c11ea PR	461	if (isp->phy->last_event == USB_EVENT_NONE)
	462	isp1704_charger_set_power(isp, 0);
	463
e1a85694	464	/* Detect charger if VBUS is valid (the cable was already plugged). */
f07c11ea PR	465	if (isp->phy->last_event == USB_EVENT_VBUS &&
f07c11ea PR	466	!isp->phy->otg->default_a)
e1a85694	467	schedule_work(&isp->work);
e1a85694	468
ec46475f HK	469	return 0;
ec46475f HK	470	fail2:
297d716f	471	power_supply_unregister(isp->psy);
ec46475f	472	fail1:
81a08382	473	isp1704_charger_set_power(isp, 0);
ec46475f	474	fail0:
ec46475f HK	475	dev_err(&pdev->dev, "failed to register isp1704 with error %d\n", ret);
	476
	477	return ret;
	478	}
	479
415ec69f	480	static int isp1704_charger_remove(struct platform_device *pdev)
ec46475f HK	481	{
	482	struct isp1704_charger *isp = platform_get_drvdata(pdev);
	483
fcc8ebc9	484	usb_unregister_notifier(isp->phy, &isp->nb);
297d716f	485	power_supply_unregister(isp->psy);
2785cefc	486	isp1704_charger_set_power(isp, 0);
ec46475f HK	487
	488	return 0;
	489	}
	490
34a10961 SR	491	#ifdef CONFIG_OF
	492	static const struct of_device_id omap_isp1704_of_match[] = {
	493	{ .compatible = "nxp,isp1704", },
64876fe5	494	{ .compatible = "nxp,isp1707", },
34a10961 SR	495	{},
	496	};
	497	MODULE_DEVICE_TABLE(of, omap_isp1704_of_match);
	498	#endif
	499
ec46475f HK	500	static struct platform_driver isp1704_charger_driver = {
	501	.driver = {
	502	.name = "isp1704_charger",
34a10961	503	.of_match_table = of_match_ptr(omap_isp1704_of_match),
ec46475f HK	504	},
ec46475f HK	505	.probe = isp1704_charger_probe,
28ea73f4	506	.remove = isp1704_charger_remove,
ec46475f HK	507	};
ec46475f HK	508
300bac7f	509	module_platform_driver(isp1704_charger_driver);
ec46475f HK	510
	511	MODULE_ALIAS("platform:isp1704_charger");
	512	MODULE_AUTHOR("Nokia Corporation");
	513	MODULE_DESCRIPTION("ISP170x USB Charger driver");
	514	MODULE_LICENSE("GPL");