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

/*
 * ISP1704 USB Charger Detection driver
 *
 * Copyright (C) 2010 Nokia Corporation
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
 */

#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/err.h>
#include <linux/init.h>
#include <linux/types.h>
#include <linux/device.h>
#include <linux/sysfs.h>
#include <linux/platform_device.h>
#include <linux/power_supply.h>
#include <linux/delay.h>

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

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

#define NXP_VENDOR_ID			0x04cc

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

struct isp1704_charger {
	struct device		*dev;
	struct power_supply	psy;
	struct otg_transceiver	*otg;
	struct notifier_block	nb;
	struct work_struct	work;

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

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

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

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

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

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

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

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

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

	return type;
}

/*
 * ISP1704 detects PS/2 adapters as charger. To make sure the detected charger
 * is actually a dedicated charger, the following steps need to be taken.
 */
static inline int isp1704_charger_verify(struct isp1704_charger *isp)
{
	int	ret = 0;
	u8	r;

	/* Reset the transceiver */
	r = otg_io_read(isp->otg, ULPI_FUNC_CTRL);
	r |= ULPI_FUNC_CTRL_RESET;
	otg_io_write(isp->otg, ULPI_FUNC_CTRL, r);
	usleep_range(1000, 2000);

	/* Set normal mode */
	r &= ~(ULPI_FUNC_CTRL_RESET | ULPI_FUNC_CTRL_OPMODE_MASK);
	otg_io_write(isp->otg, ULPI_FUNC_CTRL, r);

	/* Clear the DP and DM pull-down bits */
	r = ULPI_OTG_CTRL_DP_PULLDOWN | ULPI_OTG_CTRL_DM_PULLDOWN;
	otg_io_write(isp->otg, ULPI_CLR(ULPI_OTG_CTRL), r);

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

	/* Read the line state */
	if (!otg_io_read(isp->otg, ULPI_DEBUG)) {
		/* Disable strong pull-up on DP (1.5K) */
		otg_io_write(isp->otg, ULPI_CLR(ULPI_FUNC_CTRL),
				ULPI_FUNC_CTRL_TERMSELECT);
		return 1;
	}

	/* Is it a charger or PS/2 connection */

	/* Enable weak pull-up resistor on DP */
	otg_io_write(isp->otg, ULPI_SET(ISP1704_PWR_CTRL),
			ISP1704_PWR_CTRL_DP_WKPU_EN);

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

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

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

	/* Disable weak pull-up resistor on DP */
	otg_io_write(isp->otg, ULPI_CLR(ISP1704_PWR_CTRL),
			ISP1704_PWR_CTRL_DP_WKPU_EN);

	return ret;
}

static inline int isp1704_charger_detect(struct isp1704_charger *isp)
{
	unsigned long	timeout;
	u8		pwr_ctrl;
	int		ret = 0;

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

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

	/* enable manual charger detection */
	otg_io_write(isp->otg, ULPI_SET(ISP1704_PWR_CTRL),
			ISP1704_PWR_CTRL_SWCTRL
			| ISP1704_PWR_CTRL_DPVSRC_EN);
	usleep_range(1000, 2000);

	timeout = jiffies + msecs_to_jiffies(300);
	do {
		/* Check if there is a charger */
		if (otg_io_read(isp->otg, ISP1704_PWR_CTRL)
				& ISP1704_PWR_CTRL_VDAT_DET) {
			ret = isp1704_charger_verify(isp);
			break;
		}
	} while (!time_after(jiffies, timeout) && isp->online);

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

	return ret;
}

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

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

	mutex_lock(&lock);

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

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

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

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

		/*
		 * Disable data pullups. We need to prevent the controller from
		 * enumerating.
		 *
		 * FIXME: This is here to allow charger detection with Host/HUB
		 * chargers. The pullups may be enabled elsewhere, so this can
		 * not be the final solution.
		 */
		if (isp->otg->gadget)
			usb_gadget_disconnect(isp->otg->gadget);
		break;
	case USB_EVENT_ENUMERATED:
		if (isp->present)
			isp->current_max = 1800;
		else
			isp->current_max = power;
		break;
	default:
		goto out;
	}

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

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

	isp->event = event;

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

	schedule_work(&isp->work);

	return NOTIFY_OK;
}

static int isp1704_charger_get_property(struct power_supply *psy,
				enum power_supply_property psp,
				union power_supply_propval *val)
{
	struct isp1704_charger *isp =
		container_of(psy, struct isp1704_charger, psy);

	switch (psp) {
	case POWER_SUPPLY_PROP_PRESENT:
		val->intval = isp->present;
		break;
	case POWER_SUPPLY_PROP_ONLINE:
		val->intval = isp->online;
		break;
	case POWER_SUPPLY_PROP_CURRENT_MAX:
		val->intval = isp->current_max;
		break;
	case POWER_SUPPLY_PROP_MODEL_NAME:
		val->strval = isp->model;
		break;
	case POWER_SUPPLY_PROP_MANUFACTURER:
		val->strval = "NXP";
		break;
	default:
		return -EINVAL;
	}
	return 0;
}

static enum power_supply_property power_props[] = {
	POWER_SUPPLY_PROP_PRESENT,
	POWER_SUPPLY_PROP_ONLINE,
	POWER_SUPPLY_PROP_CURRENT_MAX,
	POWER_SUPPLY_PROP_MODEL_NAME,
	POWER_SUPPLY_PROP_MANUFACTURER,
};

static inline int isp1704_test_ulpi(struct isp1704_charger *isp)
{
	int vendor;
	int product;
	int i;
	int ret = -ENODEV;

	/* Test ULPI interface */
	ret = otg_io_write(isp->otg, ULPI_SCRATCH, 0xaa);
	if (ret < 0)
		return ret;

	ret = otg_io_read(isp->otg, ULPI_SCRATCH);
	if (ret < 0)
		return ret;

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

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

	product = otg_io_read(isp->otg, ULPI_PRODUCT_ID_LOW);
	product |= otg_io_read(isp->otg, ULPI_PRODUCT_ID_HIGH) << 8;

	for (i = 0; i < ARRAY_SIZE(isp170x_id); i++) {
		if (product == isp170x_id[i]) {
			sprintf(isp->model, "isp%x", product);
			return product;
		}
	}

	dev_err(isp->dev, "product id %x not matching known ids", product);

	return -ENODEV;
}

static int __devinit isp1704_charger_probe(struct platform_device *pdev)
{
	struct isp1704_charger	*isp;
	int			ret = -ENODEV;

	isp = kzalloc(sizeof *isp, GFP_KERNEL);
	if (!isp)
		return -ENOMEM;

	isp->otg = otg_get_transceiver();
	if (!isp->otg)
		goto fail0;

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

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

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

	ret = power_supply_register(isp->dev, &isp->psy);
	if (ret)
		goto fail1;

	/*
	 * REVISIT: using work in order to allow the otg notifications to be
	 * made atomically in the future.
	 */
	INIT_WORK(&isp->work, isp1704_charger_work);

	isp->nb.notifier_call = isp1704_notifier_call;

	ret = otg_register_notifier(isp->otg, &isp->nb);
	if (ret)
		goto fail2;

	dev_info(isp->dev, "registered with product id %s\n", isp->model);

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

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

	return 0;
fail2:
	power_supply_unregister(&isp->psy);
fail1:
	otg_put_transceiver(isp->otg);
fail0:
	kfree(isp);

	dev_err(&pdev->dev, "failed to register isp1704 with error %d\n", ret);

	return ret;
}

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

	otg_unregister_notifier(isp->otg, &isp->nb);
	power_supply_unregister(&isp->psy);
	otg_put_transceiver(isp->otg);
	kfree(isp);

	return 0;
}

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

static int __init isp1704_charger_init(void)
{
	return platform_driver_register(&isp1704_charger_driver);
}
module_init(isp1704_charger_init);

static void __exit isp1704_charger_exit(void)
{
	platform_driver_unregister(&isp1704_charger_driver);
}
module_exit(isp1704_charger_exit);

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