Merge git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/usb-2.6

* git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/usb-2.6: (123 commits)
  wimax/i2400m: add CREDITS and MAINTAINERS entries
  wimax: export linux/wimax.h and linux/wimax/i2400m.h with headers_install
  i2400m: Makefile and Kconfig
  i2400m/SDIO: TX and RX path backends
  i2400m/SDIO: firmware upload backend
  i2400m/SDIO: probe/disconnect, dev init/shutdown and reset backends
  i2400m/SDIO: header for the SDIO subdriver
  i2400m/USB: TX and RX path backends
  i2400m/USB: firmware upload backend
  i2400m/USB: probe/disconnect, dev init/shutdown and reset backends
  i2400m/USB: header for the USB bus driver
  i2400m: debugfs controls
  i2400m: various functions for device management
  i2400m: RX and TX data/control paths
  i2400m: firmware loading and bootrom initialization
  i2400m: linkage to the networking stack
  i2400m: Generic probe/disconnect, reset and message passing
  i2400m: host/device procotol and core driver definitions
  i2400m: documentation and instructions for usage
  wimax: Makefile, Kconfig and docbook linkage for the stack
  ...

6 files changed, 2873 insertions, 0 deletions

diff --git a/drivers/usb/otg/Kconfig b/drivers/usb/otg/Kconfig
new file mode 100644
index 000000000000..8e8dbdb9b39b
--- /dev/null
+++ b/drivers/usb/otg/Kconfig
@@ -0,0 +1,54 @@
+#
+# USB OTG infrastructure may be needed for peripheral-only, host-only,
+# or OTG-capable configurations when OTG transceivers or controllers
+# are used.
+#
+
+comment "OTG and related infrastructure"
+
+if USB || USB_GADGET
+
+config USB_OTG_UTILS
+	bool
+	help
+	  Select this to make sure the build includes objects from
+	  the OTG infrastructure directory.
+
+#
+# USB Transceiver Drivers
+#
+config USB_GPIO_VBUS
+	tristate "GPIO based peripheral-only VBUS sensing 'transceiver'"
+	depends on GENERIC_GPIO
+	select USB_OTG_UTILS
+	help
+	  Provides simple GPIO VBUS sensing for controllers with an
+	  internal transceiver via the otg_transceiver interface, and
+	  optionally control of a D+ pullup GPIO as well as a VBUS
+	  current limit regulator.
+
+config ISP1301_OMAP
+	tristate "Philips ISP1301 with OMAP OTG"
+	depends on I2C && ARCH_OMAP_OTG
+	select USB_OTG_UTILS
+	help
+	  If you say yes here you get support for the Philips ISP1301
+	  USB-On-The-Go transceiver working with the OMAP OTG controller.
+	  The ISP1301 is a full speed USB  transceiver which is used in
+	  products including H2, H3, and H4 development boards for Texas
+	  Instruments OMAP processors.
+
+	  This driver can also be built as a module.  If so, the module
+	  will be called isp1301_omap.
+
+config TWL4030_USB
+	tristate "TWL4030 USB Transceiver Driver"
+	depends on TWL4030_CORE
+	select USB_OTG_UTILS
+	help
+	  Enable this to support the USB OTG transceiver on TWL4030
+	  family chips (including the TWL5030 and TPS659x0 devices).
+	  This transceiver supports high and full speed devices plus,
+	  in host mode, low speed.
+
+endif # USB || OTG
diff --git a/drivers/usb/otg/Makefile b/drivers/usb/otg/Makefile
new file mode 100644
index 000000000000..d73c7cf5e2f7
--- /dev/null
+++ b/drivers/usb/otg/Makefile
@@ -0,0 +1,15 @@
+#
+# OTG infrastructure and transceiver drivers
+#
+
+# infrastructure
+obj-$(CONFIG_USB_OTG_UTILS)	+= otg.o
+
+# transceiver drivers
+obj-$(CONFIG_USB_GPIO_VBUS)	+= gpio_vbus.o
+obj-$(CONFIG_ISP1301_OMAP)	+= isp1301_omap.o
+obj-$(CONFIG_TWL4030_USB)	+= twl4030-usb.o
+
+ccflags-$(CONFIG_USB_DEBUG)	+= -DDEBUG
+ccflags-$(CONFIG_USB_GADGET_DEBUG) += -DDEBUG
+
diff --git a/drivers/usb/otg/gpio_vbus.c b/drivers/usb/otg/gpio_vbus.c
new file mode 100644
index 000000000000..63a6036f04be
--- /dev/null
+++ b/drivers/usb/otg/gpio_vbus.c
@@ -0,0 +1,335 @@
+/*
+ * gpio-vbus.c - simple GPIO VBUS sensing driver for B peripheral devices
+ *
+ * Copyright (c) 2008 Philipp Zabel <philipp.zabel@gmail.com>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ */
+
+#include <linux/kernel.h>
+#include <linux/platform_device.h>
+#include <linux/gpio.h>
+#include <linux/interrupt.h>
+#include <linux/usb.h>
+
+#include <linux/regulator/consumer.h>
+
+#include <linux/usb/gadget.h>
+#include <linux/usb/gpio_vbus.h>
+#include <linux/usb/otg.h>
+
+
+/*
+ * A simple GPIO VBUS sensing driver for B peripheral only devices
+ * with internal transceivers. It can control a D+ pullup GPIO and
+ * a regulator to limit the current drawn from VBUS.
+ *
+ * Needs to be loaded before the UDC driver that will use it.
+ */
+struct gpio_vbus_data {
+	struct otg_transceiver otg;
+	struct device          *dev;
+	struct regulator       *vbus_draw;
+	int			vbus_draw_enabled;
+	unsigned		mA;
+};
+
+
+/*
+ * This driver relies on "both edges" triggering.  VBUS has 100 msec to
+ * stabilize, so the peripheral controller driver may need to cope with
+ * some bouncing due to current surges (e.g. charging local capacitance)
+ * and contact chatter.
+ *
+ * REVISIT in desperate straits, toggling between rising and falling
+ * edges might be workable.
+ */
+#define VBUS_IRQ_FLAGS \
+	( IRQF_SAMPLE_RANDOM | IRQF_SHARED \
+	| IRQF_TRIGGER_RISING | IRQF_TRIGGER_FALLING )
+
+
+/* interface to regulator framework */
+static void set_vbus_draw(struct gpio_vbus_data *gpio_vbus, unsigned mA)
+{
+	struct regulator *vbus_draw = gpio_vbus->vbus_draw;
+	int enabled;
+
+	if (!vbus_draw)
+		return;
+
+	enabled = gpio_vbus->vbus_draw_enabled;
+	if (mA) {
+		regulator_set_current_limit(vbus_draw, 0, 1000 * mA);
+		if (!enabled) {
+			regulator_enable(vbus_draw);
+			gpio_vbus->vbus_draw_enabled = 1;
+		}
+	} else {
+		if (enabled) {
+			regulator_disable(vbus_draw);
+			gpio_vbus->vbus_draw_enabled = 0;
+		}
+	}
+	gpio_vbus->mA = mA;
+}
+
+/* VBUS change IRQ handler */
+static irqreturn_t gpio_vbus_irq(int irq, void *data)
+{
+	struct platform_device *pdev = data;
+	struct gpio_vbus_mach_info *pdata = pdev->dev.platform_data;
+	struct gpio_vbus_data *gpio_vbus = platform_get_drvdata(pdev);
+	int gpio, vbus;
+
+	vbus = gpio_get_value(pdata->gpio_vbus);
+	if (pdata->gpio_vbus_inverted)
+		vbus = !vbus;
+
+	dev_dbg(&pdev->dev, "VBUS %s (gadget: %s)\n",
+		vbus ? "supplied" : "inactive",
+		gpio_vbus->otg.gadget ? gpio_vbus->otg.gadget->name : "none");
+
+	if (!gpio_vbus->otg.gadget)
+		return IRQ_HANDLED;
+
+	/* Peripheral controllers which manage the pullup themselves won't have
+	 * gpio_pullup configured here.  If it's configured here, we'll do what
+	 * isp1301_omap::b_peripheral() does and enable the pullup here... although
+	 * that may complicate usb_gadget_{,dis}connect() support.
+	 */
+	gpio = pdata->gpio_pullup;
+	if (vbus) {
+		gpio_vbus->otg.state = OTG_STATE_B_PERIPHERAL;
+		usb_gadget_vbus_connect(gpio_vbus->otg.gadget);
+
+		/* drawing a "unit load" is *always* OK, except for OTG */
+		set_vbus_draw(gpio_vbus, 100);
+
+		/* optionally enable D+ pullup */
+		if (gpio_is_valid(gpio))
+			gpio_set_value(gpio, !pdata->gpio_pullup_inverted);
+	} else {
+		/* optionally disable D+ pullup */
+		if (gpio_is_valid(gpio))
+			gpio_set_value(gpio, pdata->gpio_pullup_inverted);
+
+		set_vbus_draw(gpio_vbus, 0);
+
+		usb_gadget_vbus_disconnect(gpio_vbus->otg.gadget);
+		gpio_vbus->otg.state = OTG_STATE_B_IDLE;
+	}
+
+	return IRQ_HANDLED;
+}
+
+/* OTG transceiver interface */
+
+/* bind/unbind the peripheral controller */
+static int gpio_vbus_set_peripheral(struct otg_transceiver *otg,
+				struct usb_gadget *gadget)
+{
+	struct gpio_vbus_data *gpio_vbus;
+	struct gpio_vbus_mach_info *pdata;
+	struct platform_device *pdev;
+	int gpio, irq;
+
+	gpio_vbus = container_of(otg, struct gpio_vbus_data, otg);
+	pdev = to_platform_device(gpio_vbus->dev);
+	pdata = gpio_vbus->dev->platform_data;
+	irq = gpio_to_irq(pdata->gpio_vbus);
+	gpio = pdata->gpio_pullup;
+
+	if (!gadget) {
+		dev_dbg(&pdev->dev, "unregistering gadget '%s'\n",
+			otg->gadget->name);
+
+		/* optionally disable D+ pullup */
+		if (gpio_is_valid(gpio))
+			gpio_set_value(gpio, pdata->gpio_pullup_inverted);
+
+		set_vbus_draw(gpio_vbus, 0);
+
+		usb_gadget_vbus_disconnect(otg->gadget);
+		otg->state = OTG_STATE_UNDEFINED;
+
+		otg->gadget = NULL;
+		return 0;
+	}
+
+	otg->gadget = gadget;
+	dev_dbg(&pdev->dev, "registered gadget '%s'\n", gadget->name);
+
+	/* initialize connection state */
+	gpio_vbus_irq(irq, pdev);
+	return 0;
+}
+
+/* effective for B devices, ignored for A-peripheral */
+static int gpio_vbus_set_power(struct otg_transceiver *otg, unsigned mA)
+{
+	struct gpio_vbus_data *gpio_vbus;
+
+	gpio_vbus = container_of(otg, struct gpio_vbus_data, otg);
+
+	if (otg->state == OTG_STATE_B_PERIPHERAL)
+		set_vbus_draw(gpio_vbus, mA);
+	return 0;
+}
+
+/* for non-OTG B devices: set/clear transceiver suspend mode */
+static int gpio_vbus_set_suspend(struct otg_transceiver *otg, int suspend)
+{
+	struct gpio_vbus_data *gpio_vbus;
+
+	gpio_vbus = container_of(otg, struct gpio_vbus_data, otg);
+
+	/* draw max 0 mA from vbus in suspend mode; or the previously
+	 * recorded amount of current if not suspended
+	 *
+	 * NOTE: high powered configs (mA > 100) may draw up to 2.5 mA
+	 * if they're wake-enabled ... we don't handle that yet.
+	 */
+	return gpio_vbus_set_power(otg, suspend ? 0 : gpio_vbus->mA);
+}
+
+/* platform driver interface */
+
+static int __init gpio_vbus_probe(struct platform_device *pdev)
+{
+	struct gpio_vbus_mach_info *pdata = pdev->dev.platform_data;
+	struct gpio_vbus_data *gpio_vbus;
+	struct resource *res;
+	int err, gpio, irq;
+
+	if (!pdata || !gpio_is_valid(pdata->gpio_vbus))
+		return -EINVAL;
+	gpio = pdata->gpio_vbus;
+
+	gpio_vbus = kzalloc(sizeof(struct gpio_vbus_data), GFP_KERNEL);
+	if (!gpio_vbus)
+		return -ENOMEM;
+
+	platform_set_drvdata(pdev, gpio_vbus);
+	gpio_vbus->dev = &pdev->dev;
+	gpio_vbus->otg.label = "gpio-vbus";
+	gpio_vbus->otg.state = OTG_STATE_UNDEFINED;
+	gpio_vbus->otg.set_peripheral = gpio_vbus_set_peripheral;
+	gpio_vbus->otg.set_power = gpio_vbus_set_power;
+	gpio_vbus->otg.set_suspend = gpio_vbus_set_suspend;
+
+	err = gpio_request(gpio, "vbus_detect");
+	if (err) {
+		dev_err(&pdev->dev, "can't request vbus gpio %d, err: %d\n",
+			gpio, err);
+		goto err_gpio;
+	}
+	gpio_direction_input(gpio);
+
+	res = platform_get_resource(pdev, IORESOURCE_IRQ, 0);
+	if (res) {
+		irq = res->start;
+		res->flags &= IRQF_TRIGGER_MASK;
+		res->flags |= IRQF_SAMPLE_RANDOM | IRQF_SHARED;
+	} else
+		irq = gpio_to_irq(gpio);
+
+	/* if data line pullup is in use, initialize it to "not pulling up" */
+	gpio = pdata->gpio_pullup;
+	if (gpio_is_valid(gpio)) {
+		err = gpio_request(gpio, "udc_pullup");
+		if (err) {
+			dev_err(&pdev->dev,
+				"can't request pullup gpio %d, err: %d\n",
+				gpio, err);
+			gpio_free(pdata->gpio_vbus);
+			goto err_gpio;
+		}
+		gpio_direction_output(gpio, pdata->gpio_pullup_inverted);
+	}
+
+	err = request_irq(irq, gpio_vbus_irq, VBUS_IRQ_FLAGS,
+		"vbus_detect", pdev);
+	if (err) {
+		dev_err(&pdev->dev, "can't request irq %i, err: %d\n",
+			irq, err);
+		goto err_irq;
+	}
+
+	/* only active when a gadget is registered */
+	err = otg_set_transceiver(&gpio_vbus->otg);
+	if (err) {
+		dev_err(&pdev->dev, "can't register transceiver, err: %d\n",
+			err);
+		goto err_otg;
+	}
+
+	gpio_vbus->vbus_draw = regulator_get(&pdev->dev, "vbus_draw");
+	if (IS_ERR(gpio_vbus->vbus_draw)) {
+		dev_dbg(&pdev->dev, "can't get vbus_draw regulator, err: %ld\n",
+			PTR_ERR(gpio_vbus->vbus_draw));
+		gpio_vbus->vbus_draw = NULL;
+	}
+
+	return 0;
+err_otg:
+	free_irq(irq, &pdev->dev);
+err_irq:
+	if (gpio_is_valid(pdata->gpio_pullup))
+		gpio_free(pdata->gpio_pullup);
+	gpio_free(pdata->gpio_vbus);
+err_gpio:
+	platform_set_drvdata(pdev, NULL);
+	kfree(gpio_vbus);
+	return err;
+}
+
+static int __exit gpio_vbus_remove(struct platform_device *pdev)
+{
+	struct gpio_vbus_data *gpio_vbus = platform_get_drvdata(pdev);
+	struct gpio_vbus_mach_info *pdata = pdev->dev.platform_data;
+	int gpio = pdata->gpio_vbus;
+
+	regulator_put(gpio_vbus->vbus_draw);
+
+	otg_set_transceiver(NULL);
+
+	free_irq(gpio_to_irq(gpio), &pdev->dev);
+	if (gpio_is_valid(pdata->gpio_pullup))
+		gpio_free(pdata->gpio_pullup);
+	gpio_free(gpio);
+	platform_set_drvdata(pdev, NULL);
+	kfree(gpio_vbus);
+
+	return 0;
+}
+
+/* NOTE:  the gpio-vbus device may *NOT* be hotplugged */
+
+MODULE_ALIAS("platform:gpio-vbus");
+
+static struct platform_driver gpio_vbus_driver = {
+	.driver = {
+		.name  = "gpio-vbus",
+		.owner = THIS_MODULE,
+	},
+	.remove  = __exit_p(gpio_vbus_remove),
+};
+
+static int __init gpio_vbus_init(void)
+{
+	return platform_driver_probe(&gpio_vbus_driver, gpio_vbus_probe);
+}
+module_init(gpio_vbus_init);
+
+static void __exit gpio_vbus_exit(void)
+{
+	platform_driver_unregister(&gpio_vbus_driver);
+}
+module_exit(gpio_vbus_exit);
+
+MODULE_DESCRIPTION("simple GPIO controlled OTG transceiver driver");
+MODULE_AUTHOR("Philipp Zabel");
+MODULE_LICENSE("GPL");
diff --git a/drivers/usb/otg/isp1301_omap.c b/drivers/usb/otg/isp1301_omap.c
new file mode 100644
index 000000000000..e0d56ef2bcb0
--- /dev/null
+++ b/drivers/usb/otg/isp1301_omap.c
@@ -0,0 +1,1683 @@
+/*
+ * isp1301_omap - ISP 1301 USB transceiver, talking to OMAP OTG controller
+ *
+ * Copyright (C) 2004 Texas Instruments
+ * Copyright (C) 2004 David Brownell
+ *
+ * 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., 675 Mass Ave, Cambridge, MA 02139, USA.
+ */
+
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/init.h>
+#include <linux/slab.h>
+#include <linux/interrupt.h>
+#include <linux/platform_device.h>
+#include <linux/gpio.h>
+#include <linux/usb/ch9.h>
+#include <linux/usb/gadget.h>
+#include <linux/usb.h>
+#include <linux/usb/otg.h>
+#include <linux/i2c.h>
+#include <linux/workqueue.h>
+
+#include <asm/irq.h>
+#include <asm/mach-types.h>
+
+#include <mach/usb.h>
+#include <mach/mux.h>
+
+
+#ifndef	DEBUG
+#undef	VERBOSE
+#endif
+
+
+#define	DRIVER_VERSION	"24 August 2004"
+#define	DRIVER_NAME	(isp1301_driver.driver.name)
+
+MODULE_DESCRIPTION("ISP1301 USB OTG Transceiver Driver");
+MODULE_LICENSE("GPL");
+
+struct isp1301 {
+	struct otg_transceiver	otg;
+	struct i2c_client	*client;
+	void			(*i2c_release)(struct device *dev);
+
+	int			irq_type;
+
+	u32			last_otg_ctrl;
+	unsigned		working:1;
+
+	struct timer_list	timer;
+
+	/* use keventd context to change the state for us */
+	struct work_struct	work;
+
+	unsigned long		todo;
+#		define WORK_UPDATE_ISP	0	/* update ISP from OTG */
+#		define WORK_UPDATE_OTG	1	/* update OTG from ISP */
+#		define WORK_HOST_RESUME	4	/* resume host */
+#		define WORK_TIMER	6	/* timer fired */
+#		define WORK_STOP	7	/* don't resubmit */
+};
+
+
+/* bits in OTG_CTRL */
+
+#define	OTG_XCEIV_OUTPUTS \
+	(OTG_ASESSVLD|OTG_BSESSEND|OTG_BSESSVLD|OTG_VBUSVLD|OTG_ID)
+#define	OTG_XCEIV_INPUTS \
+	(OTG_PULLDOWN|OTG_PULLUP|OTG_DRV_VBUS|OTG_PD_VBUS|OTG_PU_VBUS|OTG_PU_ID)
+#define	OTG_CTRL_BITS \
+	(OTG_A_BUSREQ|OTG_A_SETB_HNPEN|OTG_B_BUSREQ|OTG_B_HNPEN|OTG_BUSDROP)
+	/* and OTG_PULLUP is sometimes written */
+
+#define	OTG_CTRL_MASK	(OTG_DRIVER_SEL| \
+	OTG_XCEIV_OUTPUTS|OTG_XCEIV_INPUTS| \
+	OTG_CTRL_BITS)
+
+
+/*-------------------------------------------------------------------------*/
+
+/* board-specific PM hooks */
+
+#if defined(CONFIG_MACH_OMAP_H2) || defined(CONFIG_MACH_OMAP_H3)
+
+#if	defined(CONFIG_TPS65010) || defined(CONFIG_TPS65010_MODULE)
+
+#include <linux/i2c/tps65010.h>
+
+#else
+
+static inline int tps65010_set_vbus_draw(unsigned mA)
+{
+	pr_debug("tps65010: draw %d mA (STUB)\n", mA);
+	return 0;
+}
+
+#endif
+
+static void enable_vbus_draw(struct isp1301 *isp, unsigned mA)
+{
+	int status = tps65010_set_vbus_draw(mA);
+	if (status < 0)
+		pr_debug("  VBUS %d mA error %d\n", mA, status);
+}
+
+static void enable_vbus_source(struct isp1301 *isp)
+{
+	/* this board won't supply more than 8mA vbus power.
+	 * some boards can switch a 100ma "unit load" (or more).
+	 */
+}
+
+
+/* products will deliver OTG messages with LEDs, GUI, etc */
+static inline void notresponding(struct isp1301 *isp)
+{
+	printk(KERN_NOTICE "OTG device not responding.\n");
+}
+
+
+#endif
+
+#if defined(CONFIG_MACH_OMAP_H4)
+
+static void enable_vbus_draw(struct isp1301 *isp, unsigned mA)
+{
+	/* H4 controls this by DIP switch S2.4; no soft control.
+	 * ON means the charger is always enabled.  Leave it OFF
+	 * unless the OTG port is used only in B-peripheral mode.
+	 */
+}
+
+static void enable_vbus_source(struct isp1301 *isp)
+{
+	/* this board won't supply more than 8mA vbus power.
+	 * some boards can switch a 100ma "unit load" (or more).
+	 */
+}
+
+
+/* products will deliver OTG messages with LEDs, GUI, etc */
+static inline void notresponding(struct isp1301 *isp)
+{
+	printk(KERN_NOTICE "OTG device not responding.\n");
+}
+
+
+#endif
+
+/*-------------------------------------------------------------------------*/
+
+static struct i2c_driver isp1301_driver;
+
+/* smbus apis are used for portability */
+
+static inline u8
+isp1301_get_u8(struct isp1301 *isp, u8 reg)
+{
+	return i2c_smbus_read_byte_data(isp->client, reg + 0);
+}
+
+static inline int
+isp1301_get_u16(struct isp1301 *isp, u8 reg)
+{
+	return i2c_smbus_read_word_data(isp->client, reg);
+}
+
+static inline int
+isp1301_set_bits(struct isp1301 *isp, u8 reg, u8 bits)
+{
+	return i2c_smbus_write_byte_data(isp->client, reg + 0, bits);
+}
+
+static inline int
+isp1301_clear_bits(struct isp1301 *isp, u8 reg, u8 bits)
+{
+	return i2c_smbus_write_byte_data(isp->client, reg + 1, bits);
+}
+
+/*-------------------------------------------------------------------------*/
+
+/* identification */
+#define	ISP1301_VENDOR_ID		0x00	/* u16 read */
+#define	ISP1301_PRODUCT_ID		0x02	/* u16 read */
+#define	ISP1301_BCD_DEVICE		0x14	/* u16 read */
+
+#define	I2C_VENDOR_ID_PHILIPS		0x04cc
+#define	I2C_PRODUCT_ID_PHILIPS_1301	0x1301
+
+/* operational registers */
+#define	ISP1301_MODE_CONTROL_1		0x04	/* u8 read, set, +1 clear */
+#	define	MC1_SPEED		(1 << 0)
+#	define	MC1_SUSPEND		(1 << 1)
+#	define	MC1_DAT_SE0		(1 << 2)
+#	define	MC1_TRANSPARENT		(1 << 3)
+#	define	MC1_BDIS_ACON_EN	(1 << 4)
+#	define	MC1_OE_INT_EN		(1 << 5)
+#	define	MC1_UART_EN		(1 << 6)
+#	define	MC1_MASK		0x7f
+#define	ISP1301_MODE_CONTROL_2		0x12	/* u8 read, set, +1 clear */
+#	define	MC2_GLOBAL_PWR_DN	(1 << 0)
+#	define	MC2_SPD_SUSP_CTRL	(1 << 1)
+#	define	MC2_BI_DI		(1 << 2)
+#	define	MC2_TRANSP_BDIR0	(1 << 3)
+#	define	MC2_TRANSP_BDIR1	(1 << 4)
+#	define	MC2_AUDIO_EN		(1 << 5)
+#	define	MC2_PSW_EN		(1 << 6)
+#	define	MC2_EN2V7		(1 << 7)
+#define	ISP1301_OTG_CONTROL_1		0x06	/* u8 read, set, +1 clear */
+#	define	OTG1_DP_PULLUP		(1 << 0)
+#	define	OTG1_DM_PULLUP		(1 << 1)
+#	define	OTG1_DP_PULLDOWN	(1 << 2)
+#	define	OTG1_DM_PULLDOWN	(1 << 3)
+#	define	OTG1_ID_PULLDOWN	(1 << 4)
+#	define	OTG1_VBUS_DRV		(1 << 5)
+#	define	OTG1_VBUS_DISCHRG	(1 << 6)
+#	define	OTG1_VBUS_CHRG		(1 << 7)
+#define	ISP1301_OTG_STATUS		0x10	/* u8 readonly */
+#	define	OTG_B_SESS_END		(1 << 6)
+#	define	OTG_B_SESS_VLD		(1 << 7)
+
+#define	ISP1301_INTERRUPT_SOURCE	0x08	/* u8 read */
+#define	ISP1301_INTERRUPT_LATCH		0x0A	/* u8 read, set, +1 clear */
+
+#define	ISP1301_INTERRUPT_FALLING	0x0C	/* u8 read, set, +1 clear */
+#define	ISP1301_INTERRUPT_RISING	0x0E	/* u8 read, set, +1 clear */
+
+/* same bitfields in all interrupt registers */
+#	define	INTR_VBUS_VLD		(1 << 0)
+#	define	INTR_SESS_VLD		(1 << 1)
+#	define	INTR_DP_HI		(1 << 2)
+#	define	INTR_ID_GND		(1 << 3)
+#	define	INTR_DM_HI		(1 << 4)
+#	define	INTR_ID_FLOAT		(1 << 5)
+#	define	INTR_BDIS_ACON		(1 << 6)
+#	define	INTR_CR_INT		(1 << 7)
+
+/*-------------------------------------------------------------------------*/
+
+static const char *state_string(enum usb_otg_state state)
+{
+	switch (state) {
+	case OTG_STATE_A_IDLE:		return "a_idle";
+	case OTG_STATE_A_WAIT_VRISE:	return "a_wait_vrise";
+	case OTG_STATE_A_WAIT_BCON:	return "a_wait_bcon";
+	case OTG_STATE_A_HOST:		return "a_host";
+	case OTG_STATE_A_SUSPEND:	return "a_suspend";
+	case OTG_STATE_A_PERIPHERAL:	return "a_peripheral";
+	case OTG_STATE_A_WAIT_VFALL:	return "a_wait_vfall";
+	case OTG_STATE_A_VBUS_ERR:	return "a_vbus_err";
+	case OTG_STATE_B_IDLE:		return "b_idle";
+	case OTG_STATE_B_SRP_INIT:	return "b_srp_init";
+	case OTG_STATE_B_PERIPHERAL:	return "b_peripheral";
+	case OTG_STATE_B_WAIT_ACON:	return "b_wait_acon";
+	case OTG_STATE_B_HOST:		return "b_host";
+	default:			return "UNDEFINED";
+	}
+}
+
+static inline const char *state_name(struct isp1301 *isp)
+{
+	return state_string(isp->otg.state);
+}
+
+/*-------------------------------------------------------------------------*/
+
+/* NOTE:  some of this ISP1301 setup is specific to H2 boards;
+ * not everything is guarded by board-specific checks, or even using
+ * omap_usb_config data to deduce MC1_DAT_SE0 and MC2_BI_DI.
+ *
+ * ALSO:  this currently doesn't use ISP1301 low-power modes
+ * while OTG is running.
+ */
+
+static void power_down(struct isp1301 *isp)
+{
+	isp->otg.state = OTG_STATE_UNDEFINED;
+
+	// isp1301_set_bits(isp, ISP1301_MODE_CONTROL_2, MC2_GLOBAL_PWR_DN);
+	isp1301_set_bits(isp, ISP1301_MODE_CONTROL_1, MC1_SUSPEND);
+
+	isp1301_clear_bits(isp, ISP1301_OTG_CONTROL_1, OTG1_ID_PULLDOWN);
+	isp1301_clear_bits(isp, ISP1301_MODE_CONTROL_1, MC1_DAT_SE0);
+}
+
+static void power_up(struct isp1301 *isp)
+{
+	// isp1301_clear_bits(isp, ISP1301_MODE_CONTROL_2, MC2_GLOBAL_PWR_DN);
+	isp1301_clear_bits(isp, ISP1301_MODE_CONTROL_1, MC1_SUSPEND);
+
+	/* do this only when cpu is driving transceiver,
+	 * so host won't see a low speed device...
+	 */
+	isp1301_set_bits(isp, ISP1301_MODE_CONTROL_1, MC1_DAT_SE0);
+}
+
+#define	NO_HOST_SUSPEND
+
+static int host_suspend(struct isp1301 *isp)
+{
+#ifdef	NO_HOST_SUSPEND
+	return 0;
+#else
+	struct device	*dev;
+
+	if (!isp->otg.host)
+		return -ENODEV;
+
+	/* Currently ASSUMES only the OTG port matters;
+	 * other ports could be active...
+	 */
+	dev = isp->otg.host->controller;
+	return dev->driver->suspend(dev, 3, 0);
+#endif
+}
+
+static int host_resume(struct isp1301 *isp)
+{
+#ifdef	NO_HOST_SUSPEND
+	return 0;
+#else
+	struct device	*dev;
+
+	if (!isp->otg.host)
+		return -ENODEV;
+
+	dev = isp->otg.host->controller;
+	return dev->driver->resume(dev, 0);
+#endif
+}
+
+static int gadget_suspend(struct isp1301 *isp)
+{
+	isp->otg.gadget->b_hnp_enable = 0;
+	isp->otg.gadget->a_hnp_support = 0;
+	isp->otg.gadget->a_alt_hnp_support = 0;
+	return usb_gadget_vbus_disconnect(isp->otg.gadget);
+}
+
+/*-------------------------------------------------------------------------*/
+
+#define	TIMER_MINUTES	10
+#define	TIMER_JIFFIES	(TIMER_MINUTES * 60 * HZ)
+
+/* Almost all our I2C messaging comes from a work queue's task context.
+ * NOTE: guaranteeing certain response times might mean we shouldn't
+ * share keventd's work queue; a realtime task might be safest.
+ */
+static void isp1301_defer_work(struct isp1301 *isp, int work)
+{
+	int status;
+
+	if (isp && !test_and_set_bit(work, &isp->todo)) {
+		(void) get_device(&isp->client->dev);
+		status = schedule_work(&isp->work);
+		if (!status && !isp->working)
+			dev_vdbg(&isp->client->dev,
+				"work item %d may be lost\n", work);
+	}
+}
+
+/* called from irq handlers */
+static void a_idle(struct isp1301 *isp, const char *tag)
+{
+	u32 l;
+
+	if (isp->otg.state == OTG_STATE_A_IDLE)
+		return;
+
+	isp->otg.default_a = 1;
+	if (isp->otg.host) {
+		isp->otg.host->is_b_host = 0;
+		host_suspend(isp);
+	}
+	if (isp->otg.gadget) {
+		isp->otg.gadget->is_a_peripheral = 1;
+		gadget_suspend(isp);
+	}
+	isp->otg.state = OTG_STATE_A_IDLE;
+	l = omap_readl(OTG_CTRL) & OTG_XCEIV_OUTPUTS;
+	omap_writel(l, OTG_CTRL);
+	isp->last_otg_ctrl = l;
+	pr_debug("  --> %s/%s\n", state_name(isp), tag);
+}
+
+/* called from irq handlers */
+static void b_idle(struct isp1301 *isp, const char *tag)
+{
+	u32 l;
+
+	if (isp->otg.state == OTG_STATE_B_IDLE)
+		return;
+
+	isp->otg.default_a = 0;
+	if (isp->otg.host) {
+		isp->otg.host->is_b_host = 1;
+		host_suspend(isp);
+	}
+	if (isp->otg.gadget) {
+		isp->otg.gadget->is_a_peripheral = 0;
+		gadget_suspend(isp);
+	}
+	isp->otg.state = OTG_STATE_B_IDLE;
+	l = omap_readl(OTG_CTRL) & OTG_XCEIV_OUTPUTS;
+	omap_writel(l, OTG_CTRL);
+	isp->last_otg_ctrl = l;
+	pr_debug("  --> %s/%s\n", state_name(isp), tag);
+}
+
+static void
+dump_regs(struct isp1301 *isp, const char *label)
+{
+#ifdef	DEBUG
+	u8	ctrl = isp1301_get_u8(isp, ISP1301_OTG_CONTROL_1);
+	u8	status = isp1301_get_u8(isp, ISP1301_OTG_STATUS);
+	u8	src = isp1301_get_u8(isp, ISP1301_INTERRUPT_SOURCE);
+
+	pr_debug("otg: %06x, %s %s, otg/%02x stat/%02x.%02x\n",
+		omap_readl(OTG_CTRL), label, state_name(isp),
+		ctrl, status, src);
+	/* mode control and irq enables don't change much */
+#endif
+}
+
+/*-------------------------------------------------------------------------*/
+
+#ifdef	CONFIG_USB_OTG
+
+/*
+ * The OMAP OTG controller handles most of the OTG state transitions.
+ *
+ * We translate isp1301 outputs (mostly voltage comparator status) into
+ * OTG inputs; OTG outputs (mostly pullup/pulldown controls) and HNP state
+ * flags into isp1301 inputs ... and infer state transitions.
+ */
+
+#ifdef	VERBOSE
+
+static void check_state(struct isp1301 *isp, const char *tag)
+{
+	enum usb_otg_state	state = OTG_STATE_UNDEFINED;
+	u8			fsm = omap_readw(OTG_TEST) & 0x0ff;
+	unsigned		extra = 0;
+
+	switch (fsm) {
+
+	/* default-b */
+	case 0x0:
+		state = OTG_STATE_B_IDLE;
+		break;
+	case 0x3:
+	case 0x7:
+		extra = 1;
+	case 0x1:
+		state = OTG_STATE_B_PERIPHERAL;
+		break;
+	case 0x11:
+		state = OTG_STATE_B_SRP_INIT;
+		break;
+
+	/* extra dual-role default-b states */
+	case 0x12:
+	case 0x13:
+	case 0x16:
+		extra = 1;
+	case 0x17:
+		state = OTG_STATE_B_WAIT_ACON;
+		break;
+	case 0x34:
+		state = OTG_STATE_B_HOST;
+		break;
+
+	/* default-a */
+	case 0x36:
+		state = OTG_STATE_A_IDLE;
+		break;
+	case 0x3c:
+		state = OTG_STATE_A_WAIT_VFALL;
+		break;
+	case 0x7d:
+		state = OTG_STATE_A_VBUS_ERR;
+		break;
+	case 0x9e:
+	case 0x9f:
+		extra = 1;
+	case 0x89:
+		state = OTG_STATE_A_PERIPHERAL;
+		break;
+	case 0xb7:
+		state = OTG_STATE_A_WAIT_VRISE;
+		break;
+	case 0xb8:
+		state = OTG_STATE_A_WAIT_BCON;
+		break;
+	case 0xb9:
+		state = OTG_STATE_A_HOST;
+		break;
+	case 0xba:
+		state = OTG_STATE_A_SUSPEND;
+		break;
+	default:
+		break;
+	}
+	if (isp->otg.state == state && !extra)
+		return;
+	pr_debug("otg: %s FSM %s/%02x, %s, %06x\n", tag,
+		state_string(state), fsm, state_name(isp),
+		omap_readl(OTG_CTRL));
+}
+
+#else
+
+static inline void check_state(struct isp1301 *isp, const char *tag) { }
+
+#endif
+
+/* outputs from ISP1301_INTERRUPT_SOURCE */
+static void update_otg1(struct isp1301 *isp, u8 int_src)
+{
+	u32	otg_ctrl;
+
+	otg_ctrl = omap_readl(OTG_CTRL) & OTG_CTRL_MASK;
+	otg_ctrl &= ~OTG_XCEIV_INPUTS;
+	otg_ctrl &= ~(OTG_ID|OTG_ASESSVLD|OTG_VBUSVLD);
+
+	if (int_src & INTR_SESS_VLD)
+		otg_ctrl |= OTG_ASESSVLD;
+	else if (isp->otg.state == OTG_STATE_A_WAIT_VFALL) {
+		a_idle(isp, "vfall");
+		otg_ctrl &= ~OTG_CTRL_BITS;
+	}
+	if (int_src & INTR_VBUS_VLD)
+		otg_ctrl |= OTG_VBUSVLD;
+	if (int_src & INTR_ID_GND) {		/* default-A */
+		if (isp->otg.state == OTG_STATE_B_IDLE
+				|| isp->otg.state == OTG_STATE_UNDEFINED) {
+			a_idle(isp, "init");
+			return;
+		}
+	} else {				/* default-B */
+		otg_ctrl |= OTG_ID;
+		if (isp->otg.state == OTG_STATE_A_IDLE
+				|| isp->otg.state == OTG_STATE_UNDEFINED) {
+			b_idle(isp, "init");
+			return;
+		}
+	}
+	omap_writel(otg_ctrl, OTG_CTRL);
+}
+
+/* outputs from ISP1301_OTG_STATUS */
+static void update_otg2(struct isp1301 *isp, u8 otg_status)
+{
+	u32	otg_ctrl;
+
+	otg_ctrl = omap_readl(OTG_CTRL) & OTG_CTRL_MASK;
+	otg_ctrl &= ~OTG_XCEIV_INPUTS;
+	otg_ctrl &= ~(OTG_BSESSVLD | OTG_BSESSEND);
+	if (otg_status & OTG_B_SESS_VLD)
+		otg_ctrl |= OTG_BSESSVLD;
+	else if (otg_status & OTG_B_SESS_END)
+		otg_ctrl |= OTG_BSESSEND;
+	omap_writel(otg_ctrl, OTG_CTRL);
+}
+
+/* inputs going to ISP1301 */
+static void otg_update_isp(struct isp1301 *isp)
+{
+	u32	otg_ctrl, otg_change;
+	u8	set = OTG1_DM_PULLDOWN, clr = OTG1_DM_PULLUP;
+
+	otg_ctrl = omap_readl(OTG_CTRL);
+	otg_change = otg_ctrl ^ isp->last_otg_ctrl;
+	isp->last_otg_ctrl = otg_ctrl;
+	otg_ctrl = otg_ctrl & OTG_XCEIV_INPUTS;
+
+	switch (isp->otg.state) {
+	case OTG_STATE_B_IDLE:
+	case OTG_STATE_B_PERIPHERAL:
+	case OTG_STATE_B_SRP_INIT:
+		if (!(otg_ctrl & OTG_PULLUP)) {
+			// if (otg_ctrl & OTG_B_HNPEN) {
+			if (isp->otg.gadget->b_hnp_enable) {
+				isp->otg.state = OTG_STATE_B_WAIT_ACON;
+				pr_debug("  --> b_wait_acon\n");
+			}
+			goto pulldown;
+		}
+pullup:
+		set |= OTG1_DP_PULLUP;
+		clr |= OTG1_DP_PULLDOWN;
+		break;
+	case OTG_STATE_A_SUSPEND:
+	case OTG_STATE_A_PERIPHERAL:
+		if (otg_ctrl & OTG_PULLUP)
+			goto pullup;
+		/* FALLTHROUGH */
+	// case OTG_STATE_B_WAIT_ACON:
+	default:
+pulldown:
+		set |= OTG1_DP_PULLDOWN;
+		clr |= OTG1_DP_PULLUP;
+		break;
+	}
+
+#	define toggle(OTG,ISP) do { \
+		if (otg_ctrl & OTG) set |= ISP; \
+		else clr |= ISP; \
+		} while (0)
+
+	if (!(isp->otg.host))
+		otg_ctrl &= ~OTG_DRV_VBUS;
+
+	switch (isp->otg.state) {
+	case OTG_STATE_A_SUSPEND:
+		if (otg_ctrl & OTG_DRV_VBUS) {
+			set |= OTG1_VBUS_DRV;
+			break;
+		}
+		/* HNP failed for some reason (A_AIDL_BDIS timeout) */
+		notresponding(isp);
+
+		/* FALLTHROUGH */
+	case OTG_STATE_A_VBUS_ERR:
+		isp->otg.state = OTG_STATE_A_WAIT_VFALL;
+		pr_debug("  --> a_wait_vfall\n");
+		/* FALLTHROUGH */
+	case OTG_STATE_A_WAIT_VFALL:
+		/* FIXME usbcore thinks port power is still on ... */
+		clr |= OTG1_VBUS_DRV;
+		break;
+	case OTG_STATE_A_IDLE:
+		if (otg_ctrl & OTG_DRV_VBUS) {
+			isp->otg.state = OTG_STATE_A_WAIT_VRISE;
+			pr_debug("  --> a_wait_vrise\n");
+		}
+		/* FALLTHROUGH */
+	default:
+		toggle(OTG_DRV_VBUS, OTG1_VBUS_DRV);
+	}
+
+	toggle(OTG_PU_VBUS, OTG1_VBUS_CHRG);
+	toggle(OTG_PD_VBUS, OTG1_VBUS_DISCHRG);
+
+#	undef toggle
+
+	isp1301_set_bits(isp, ISP1301_OTG_CONTROL_1, set);
+	isp1301_clear_bits(isp, ISP1301_OTG_CONTROL_1, clr);
+
+	/* HNP switch to host or peripheral; and SRP */
+	if (otg_change & OTG_PULLUP) {
+		u32 l;
+
+		switch (isp->otg.state) {
+		case OTG_STATE_B_IDLE:
+			if (clr & OTG1_DP_PULLUP)
+				break;
+			isp->otg.state = OTG_STATE_B_PERIPHERAL;
+			pr_debug("  --> b_peripheral\n");
+			break;
+		case OTG_STATE_A_SUSPEND:
+			if (clr & OTG1_DP_PULLUP)
+				break;
+			isp->otg.state = OTG_STATE_A_PERIPHERAL;
+			pr_debug("  --> a_peripheral\n");
+			break;
+		default:
+			break;
+		}
+		l = omap_readl(OTG_CTRL);
+		l |= OTG_PULLUP;
+		omap_writel(l, OTG_CTRL);
+	}
+
+	check_state(isp, __func__);
+	dump_regs(isp, "otg->isp1301");
+}
+
+static irqreturn_t omap_otg_irq(int irq, void *_isp)
+{
+	u16		otg_irq = omap_readw(OTG_IRQ_SRC);
+	u32		otg_ctrl;
+	int		ret = IRQ_NONE;
+	struct isp1301	*isp = _isp;
+
+	/* update ISP1301 transciever from OTG controller */
+	if (otg_irq & OPRT_CHG) {
+		omap_writew(OPRT_CHG, OTG_IRQ_SRC);
+		isp1301_defer_work(isp, WORK_UPDATE_ISP);
+		ret = IRQ_HANDLED;
+
+	/* SRP to become b_peripheral failed */
+	} else if (otg_irq & B_SRP_TMROUT) {
+		pr_debug("otg: B_SRP_TIMEOUT, %06x\n", omap_readl(OTG_CTRL));
+		notresponding(isp);
+
+		/* gadget drivers that care should monitor all kinds of
+		 * remote wakeup (SRP, normal) using their own timer
+		 * to give "check cable and A-device" messages.
+		 */
+		if (isp->otg.state == OTG_STATE_B_SRP_INIT)
+			b_idle(isp, "srp_timeout");
+
+		omap_writew(B_SRP_TMROUT, OTG_IRQ_SRC);
+		ret = IRQ_HANDLED;
+
+	/* HNP to become b_host failed */
+	} else if (otg_irq & B_HNP_FAIL) {
+		pr_debug("otg: %s B_HNP_FAIL, %06x\n",
+				state_name(isp), omap_readl(OTG_CTRL));
+		notresponding(isp);
+
+		otg_ctrl = omap_readl(OTG_CTRL);
+		otg_ctrl |= OTG_BUSDROP;
+		otg_ctrl &= OTG_CTRL_MASK & ~OTG_XCEIV_INPUTS;
+		omap_writel(otg_ctrl, OTG_CTRL);
+
+		/* subset of b_peripheral()... */
+		isp->otg.state = OTG_STATE_B_PERIPHERAL;
+		pr_debug("  --> b_peripheral\n");
+
+		omap_writew(B_HNP_FAIL, OTG_IRQ_SRC);
+		ret = IRQ_HANDLED;
+
+	/* detect SRP from B-device ... */
+	} else if (otg_irq & A_SRP_DETECT) {
+		pr_debug("otg: %s SRP_DETECT, %06x\n",
+				state_name(isp), omap_readl(OTG_CTRL));
+
+		isp1301_defer_work(isp, WORK_UPDATE_OTG);
+		switch (isp->otg.state) {
+		case OTG_STATE_A_IDLE:
+			if (!isp->otg.host)
+				break;
+			isp1301_defer_work(isp, WORK_HOST_RESUME);
+			otg_ctrl = omap_readl(OTG_CTRL);
+			otg_ctrl |= OTG_A_BUSREQ;
+			otg_ctrl &= ~(OTG_BUSDROP|OTG_B_BUSREQ)
+					& ~OTG_XCEIV_INPUTS
+					& OTG_CTRL_MASK;
+			omap_writel(otg_ctrl, OTG_CTRL);
+			break;
+		default:
+			break;
+		}
+
+		omap_writew(A_SRP_DETECT, OTG_IRQ_SRC);
+		ret = IRQ_HANDLED;
+
+	/* timer expired:  T(a_wait_bcon) and maybe T(a_wait_vrise)
+	 * we don't track them separately
+	 */
+	} else if (otg_irq & A_REQ_TMROUT) {
+		otg_ctrl = omap_readl(OTG_CTRL);
+		pr_info("otg: BCON_TMOUT from %s, %06x\n",
+				state_name(isp), otg_ctrl);
+		notresponding(isp);
+
+		otg_ctrl |= OTG_BUSDROP;
+		otg_ctrl &= ~OTG_A_BUSREQ & OTG_CTRL_MASK & ~OTG_XCEIV_INPUTS;
+		omap_writel(otg_ctrl, OTG_CTRL);
+		isp->otg.state = OTG_STATE_A_WAIT_VFALL;
+
+		omap_writew(A_REQ_TMROUT, OTG_IRQ_SRC);
+		ret = IRQ_HANDLED;
+
+	/* A-supplied voltage fell too low; overcurrent */
+	} else if (otg_irq & A_VBUS_ERR) {
+		otg_ctrl = omap_readl(OTG_CTRL);
+		printk(KERN_ERR "otg: %s, VBUS_ERR %04x ctrl %06x\n",
+			state_name(isp), otg_irq, otg_ctrl);
+
+		otg_ctrl |= OTG_BUSDROP;
+		otg_ctrl &= ~OTG_A_BUSREQ & OTG_CTRL_MASK & ~OTG_XCEIV_INPUTS;
+		omap_writel(otg_ctrl, OTG_CTRL);
+		isp->otg.state = OTG_STATE_A_VBUS_ERR;
+
+		omap_writew(A_VBUS_ERR, OTG_IRQ_SRC);
+		ret = IRQ_HANDLED;
+
+	/* switch driver; the transciever code activates it,
+	 * ungating the udc clock or resuming OHCI.
+	 */
+	} else if (otg_irq & DRIVER_SWITCH) {
+		int	kick = 0;
+
+		otg_ctrl = omap_readl(OTG_CTRL);
+		printk(KERN_NOTICE "otg: %s, SWITCH to %s, ctrl %06x\n",
+				state_name(isp),
+				(otg_ctrl & OTG_DRIVER_SEL)
+					? "gadget" : "host",
+				otg_ctrl);
+		isp1301_defer_work(isp, WORK_UPDATE_ISP);
+
+		/* role is peripheral */
+		if (otg_ctrl & OTG_DRIVER_SEL) {
+			switch (isp->otg.state) {
+			case OTG_STATE_A_IDLE:
+				b_idle(isp, __func__);
+				break;
+			default:
+				break;
+			}
+			isp1301_defer_work(isp, WORK_UPDATE_ISP);
+
+		/* role is host */
+		} else {
+			if (!(otg_ctrl & OTG_ID)) {
+				otg_ctrl &= OTG_CTRL_MASK & ~OTG_XCEIV_INPUTS;
+				omap_writel(otg_ctrl | OTG_A_BUSREQ, OTG_CTRL);
+			}
+
+			if (isp->otg.host) {
+				switch (isp->otg.state) {
+				case OTG_STATE_B_WAIT_ACON:
+					isp->otg.state = OTG_STATE_B_HOST;
+					pr_debug("  --> b_host\n");
+					kick = 1;
+					break;
+				case OTG_STATE_A_WAIT_BCON:
+					isp->otg.state = OTG_STATE_A_HOST;
+					pr_debug("  --> a_host\n");
+					break;
+				case OTG_STATE_A_PERIPHERAL:
+					isp->otg.state = OTG_STATE_A_WAIT_BCON;
+					pr_debug("  --> a_wait_bcon\n");
+					break;
+				default:
+					break;
+				}
+				isp1301_defer_work(isp, WORK_HOST_RESUME);
+			}
+		}
+
+		omap_writew(DRIVER_SWITCH, OTG_IRQ_SRC);
+		ret = IRQ_HANDLED;
+
+		if (kick)
+			usb_bus_start_enum(isp->otg.host,
+						isp->otg.host->otg_port);
+	}
+
+	check_state(isp, __func__);
+	return ret;
+}
+
+static struct platform_device *otg_dev;
+
+static int otg_init(struct isp1301 *isp)
+{
+	u32 l;
+
+	if (!otg_dev)
+		return -ENODEV;
+
+	dump_regs(isp, __func__);
+	/* some of these values are board-specific... */
+	l = omap_readl(OTG_SYSCON_2);
+	l |= OTG_EN
+		/* for B-device: */
+		| SRP_GPDATA		/* 9msec Bdev D+ pulse */
+		| SRP_GPDVBUS		/* discharge after VBUS pulse */
+		// | (3 << 24)		/* 2msec VBUS pulse */
+		/* for A-device: */
+		| (0 << 20)		/* 200ms nominal A_WAIT_VRISE timer */
+		| SRP_DPW		/* detect 167+ns SRP pulses */
+		| SRP_DATA | SRP_VBUS	/* accept both kinds of SRP pulse */
+		;
+	omap_writel(l, OTG_SYSCON_2);
+
+	update_otg1(isp, isp1301_get_u8(isp, ISP1301_INTERRUPT_SOURCE));
+	update_otg2(isp, isp1301_get_u8(isp, ISP1301_OTG_STATUS));
+
+	check_state(isp, __func__);
+	pr_debug("otg: %s, %s %06x\n",
+			state_name(isp), __func__, omap_readl(OTG_CTRL));
+
+	omap_writew(DRIVER_SWITCH | OPRT_CHG
+			| B_SRP_TMROUT | B_HNP_FAIL
+			| A_VBUS_ERR | A_SRP_DETECT | A_REQ_TMROUT, OTG_IRQ_EN);
+
+	l = omap_readl(OTG_SYSCON_2);
+	l |= OTG_EN;
+	omap_writel(l, OTG_SYSCON_2);
+
+	return 0;
+}
+
+static int otg_probe(struct platform_device *dev)
+{
+	// struct omap_usb_config *config = dev->platform_data;
+
+	otg_dev = dev;
+	return 0;
+}
+
+static int otg_remove(struct platform_device *dev)
+{
+	otg_dev = NULL;
+	return 0;
+}
+
+static struct platform_driver omap_otg_driver = {
+	.probe		= otg_probe,
+	.remove		= otg_remove,
+	.driver		= {
+		.owner	= THIS_MODULE,
+		.name	= "omap_otg",
+	},
+};
+
+static int otg_bind(struct isp1301 *isp)
+{
+	int	status;
+
+	if (otg_dev)
+		return -EBUSY;
+
+	status = platform_driver_register(&omap_otg_driver);
+	if (status < 0)
+		return status;
+
+	if (otg_dev)
+		status = request_irq(otg_dev->resource[1].start, omap_otg_irq,
+				IRQF_DISABLED, DRIVER_NAME, isp);
+	else
+		status = -ENODEV;
+
+	if (status < 0)
+		platform_driver_unregister(&omap_otg_driver);
+	return status;
+}
+
+static void otg_unbind(struct isp1301 *isp)
+{
+	if (!otg_dev)
+		return;
+	free_irq(otg_dev->resource[1].start, isp);
+}
+
+#else
+
+/* OTG controller isn't clocked */
+
+#endif	/* CONFIG_USB_OTG */
+
+/*-------------------------------------------------------------------------*/
+
+static void b_peripheral(struct isp1301 *isp)
+{
+	u32 l;
+
+	l = omap_readl(OTG_CTRL) & OTG_XCEIV_OUTPUTS;
+	omap_writel(l, OTG_CTRL);
+
+	usb_gadget_vbus_connect(isp->otg.gadget);
+
+#ifdef	CONFIG_USB_OTG
+	enable_vbus_draw(isp, 8);
+	otg_update_isp(isp);
+#else
+	enable_vbus_draw(isp, 100);
+	/* UDC driver just set OTG_BSESSVLD */
+	isp1301_set_bits(isp, ISP1301_OTG_CONTROL_1, OTG1_DP_PULLUP);
+	isp1301_clear_bits(isp, ISP1301_OTG_CONTROL_1, OTG1_DP_PULLDOWN);
+	isp->otg.state = OTG_STATE_B_PERIPHERAL;
+	pr_debug("  --> b_peripheral\n");
+	dump_regs(isp, "2periph");
+#endif
+}
+
+static void isp_update_otg(struct isp1301 *isp, u8 stat)
+{
+	u8			isp_stat, isp_bstat;
+	enum usb_otg_state	state = isp->otg.state;
+
+	if (stat & INTR_BDIS_ACON)
+		pr_debug("OTG:  BDIS_ACON, %s\n", state_name(isp));
+
+	/* start certain state transitions right away */
+	isp_stat = isp1301_get_u8(isp, ISP1301_INTERRUPT_SOURCE);
+	if (isp_stat & INTR_ID_GND) {
+		if (isp->otg.default_a) {
+			switch (state) {
+			case OTG_STATE_B_IDLE:
+				a_idle(isp, "idle");
+				/* FALLTHROUGH */
+			case OTG_STATE_A_IDLE:
+				enable_vbus_source(isp);
+				/* FALLTHROUGH */
+			case OTG_STATE_A_WAIT_VRISE:
+				/* we skip over OTG_STATE_A_WAIT_BCON, since
+				 * the HC will transition to A_HOST (or
+				 * A_SUSPEND!) without our noticing except
+				 * when HNP is used.
+				 */
+				if (isp_stat & INTR_VBUS_VLD)
+					isp->otg.state = OTG_STATE_A_HOST;
+				break;
+			case OTG_STATE_A_WAIT_VFALL:
+				if (!(isp_stat & INTR_SESS_VLD))
+					a_idle(isp, "vfell");
+				break;
+			default:
+				if (!(isp_stat & INTR_VBUS_VLD))
+					isp->otg.state = OTG_STATE_A_VBUS_ERR;
+				break;
+			}
+			isp_bstat = isp1301_get_u8(isp, ISP1301_OTG_STATUS);
+		} else {
+			switch (state) {
+			case OTG_STATE_B_PERIPHERAL:
+			case OTG_STATE_B_HOST:
+			case OTG_STATE_B_WAIT_ACON:
+				usb_gadget_vbus_disconnect(isp->otg.gadget);
+				break;
+			default:
+				break;
+			}
+			if (state != OTG_STATE_A_IDLE)
+				a_idle(isp, "id");
+			if (isp->otg.host && state == OTG_STATE_A_IDLE)
+				isp1301_defer_work(isp, WORK_HOST_RESUME);
+			isp_bstat = 0;
+		}
+	} else {
+		u32 l;
+
+		/* if user unplugged mini-A end of cable,
+		 * don't bypass A_WAIT_VFALL.
+		 */
+		if (isp->otg.default_a) {
+			switch (state) {
+			default:
+				isp->otg.state = OTG_STATE_A_WAIT_VFALL;
+				break;
+			case OTG_STATE_A_WAIT_VFALL:
+				state = OTG_STATE_A_IDLE;
+				/* khubd may take a while to notice and
+				 * handle this disconnect, so don't go
+				 * to B_IDLE quite yet.
+				 */
+				break;
+			case OTG_STATE_A_IDLE:
+				host_suspend(isp);
+				isp1301_clear_bits(isp, ISP1301_MODE_CONTROL_1,
+						MC1_BDIS_ACON_EN);
+				isp->otg.state = OTG_STATE_B_IDLE;
+				l = omap_readl(OTG_CTRL) & OTG_CTRL_MASK;
+				l &= ~OTG_CTRL_BITS;
+				omap_writel(l, OTG_CTRL);
+				break;
+			case OTG_STATE_B_IDLE:
+				break;
+			}
+		}
+		isp_bstat = isp1301_get_u8(isp, ISP1301_OTG_STATUS);
+
+		switch (isp->otg.state) {
+		case OTG_STATE_B_PERIPHERAL:
+		case OTG_STATE_B_WAIT_ACON:
+		case OTG_STATE_B_HOST:
+			if (likely(isp_bstat & OTG_B_SESS_VLD))
+				break;
+			enable_vbus_draw(isp, 0);
+#ifndef	CONFIG_USB_OTG
+			/* UDC driver will clear OTG_BSESSVLD */
+			isp1301_set_bits(isp, ISP1301_OTG_CONTROL_1,
+						OTG1_DP_PULLDOWN);
+			isp1301_clear_bits(isp, ISP1301_OTG_CONTROL_1,
+						OTG1_DP_PULLUP);
+			dump_regs(isp, __func__);
+#endif
+			/* FALLTHROUGH */
+		case OTG_STATE_B_SRP_INIT:
+			b_idle(isp, __func__);
+			l = omap_readl(OTG_CTRL) & OTG_XCEIV_OUTPUTS;
+			omap_writel(l, OTG_CTRL);
+			/* FALLTHROUGH */
+		case OTG_STATE_B_IDLE:
+			if (isp->otg.gadget && (isp_bstat & OTG_B_SESS_VLD)) {
+#ifdef	CONFIG_USB_OTG
+				update_otg1(isp, isp_stat);
+				update_otg2(isp, isp_bstat);
+#endif
+				b_peripheral(isp);
+			} else if (!(isp_stat & (INTR_VBUS_VLD|INTR_SESS_VLD)))
+				isp_bstat |= OTG_B_SESS_END;
+			break;
+		case OTG_STATE_A_WAIT_VFALL:
+			break;
+		default:
+			pr_debug("otg: unsupported b-device %s\n",
+				state_name(isp));
+			break;
+		}
+	}
+
+	if (state != isp->otg.state)
+		pr_debug("  isp, %s -> %s\n",
+				state_string(state), state_name(isp));
+
+#ifdef	CONFIG_USB_OTG
+	/* update the OTG controller state to match the isp1301; may
+	 * trigger OPRT_CHG irqs for changes going to the isp1301.
+	 */
+	update_otg1(isp, isp_stat);
+	update_otg2(isp, isp_bstat);
+	check_state(isp, __func__);
+#endif
+
+	dump_regs(isp, "isp1301->otg");
+}
+
+/*-------------------------------------------------------------------------*/
+
+static u8 isp1301_clear_latch(struct isp1301 *isp)
+{
+	u8 latch = isp1301_get_u8(isp, ISP1301_INTERRUPT_LATCH);
+	isp1301_clear_bits(isp, ISP1301_INTERRUPT_LATCH, latch);
+	return latch;
+}
+
+static void
+isp1301_work(struct work_struct *work)
+{
+	struct isp1301	*isp = container_of(work, struct isp1301, work);
+	int		stop;
+
+	/* implicit lock:  we're the only task using this device */
+	isp->working = 1;
+	do {
+		stop = test_bit(WORK_STOP, &isp->todo);
+
+#ifdef	CONFIG_USB_OTG
+		/* transfer state from otg engine to isp1301 */
+		if (test_and_clear_bit(WORK_UPDATE_ISP, &isp->todo)) {
+			otg_update_isp(isp);
+			put_device(&isp->client->dev);
+		}
+#endif
+		/* transfer state from isp1301 to otg engine */
+		if (test_and_clear_bit(WORK_UPDATE_OTG, &isp->todo)) {
+			u8		stat = isp1301_clear_latch(isp);
+
+			isp_update_otg(isp, stat);
+			put_device(&isp->client->dev);
+		}
+
+		if (test_and_clear_bit(WORK_HOST_RESUME, &isp->todo)) {
+			u32	otg_ctrl;
+
+			/*
+			 * skip A_WAIT_VRISE; hc transitions invisibly
+			 * skip A_WAIT_BCON; same.
+			 */
+			switch (isp->otg.state) {
+			case OTG_STATE_A_WAIT_BCON:
+			case OTG_STATE_A_WAIT_VRISE:
+				isp->otg.state = OTG_STATE_A_HOST;
+				pr_debug("  --> a_host\n");
+				otg_ctrl = omap_readl(OTG_CTRL);
+				otg_ctrl |= OTG_A_BUSREQ;
+				otg_ctrl &= ~(OTG_BUSDROP|OTG_B_BUSREQ)
+						& OTG_CTRL_MASK;
+				omap_writel(otg_ctrl, OTG_CTRL);
+				break;
+			case OTG_STATE_B_WAIT_ACON:
+				isp->otg.state = OTG_STATE_B_HOST;
+				pr_debug("  --> b_host (acon)\n");
+				break;
+			case OTG_STATE_B_HOST:
+			case OTG_STATE_B_IDLE:
+			case OTG_STATE_A_IDLE:
+				break;
+			default:
+				pr_debug("  host resume in %s\n",
+						state_name(isp));
+			}
+			host_resume(isp);
+			// mdelay(10);
+			put_device(&isp->client->dev);
+		}
+
+		if (test_and_clear_bit(WORK_TIMER, &isp->todo)) {
+#ifdef	VERBOSE
+			dump_regs(isp, "timer");
+			if (!stop)
+				mod_timer(&isp->timer, jiffies + TIMER_JIFFIES);
+#endif
+			put_device(&isp->client->dev);
+		}
+
+		if (isp->todo)
+			dev_vdbg(&isp->client->dev,
+				"work done, todo = 0x%lx\n",
+				isp->todo);
+		if (stop) {
+			dev_dbg(&isp->client->dev, "stop\n");
+			break;
+		}
+	} while (isp->todo);
+	isp->working = 0;
+}
+
+static irqreturn_t isp1301_irq(int irq, void *isp)
+{
+	isp1301_defer_work(isp, WORK_UPDATE_OTG);
+	return IRQ_HANDLED;
+}
+
+static void isp1301_timer(unsigned long _isp)
+{
+	isp1301_defer_work((void *)_isp, WORK_TIMER);
+}
+
+/*-------------------------------------------------------------------------*/
+
+static void isp1301_release(struct device *dev)
+{
+	struct isp1301	*isp;
+
+	isp = dev_get_drvdata(dev);
+
+	/* FIXME -- not with a "new style" driver, it doesn't!! */
+
+	/* ugly -- i2c hijacks our memory hook to wait_for_completion() */
+	if (isp->i2c_release)
+		isp->i2c_release(dev);
+	kfree (isp);
+}
+
+static struct isp1301 *the_transceiver;
+
+static int __exit isp1301_remove(struct i2c_client *i2c)
+{
+	struct isp1301	*isp;
+
+	isp = i2c_get_clientdata(i2c);
+
+	isp1301_clear_bits(isp, ISP1301_INTERRUPT_FALLING, ~0);
+	isp1301_clear_bits(isp, ISP1301_INTERRUPT_RISING, ~0);
+	free_irq(i2c->irq, isp);
+#ifdef	CONFIG_USB_OTG
+	otg_unbind(isp);
+#endif
+	if (machine_is_omap_h2())
+		gpio_free(2);
+
+	isp->timer.data = 0;
+	set_bit(WORK_STOP, &isp->todo);
+	del_timer_sync(&isp->timer);
+	flush_scheduled_work();
+
+	put_device(&i2c->dev);
+	the_transceiver = NULL;
+
+	return 0;
+}
+
+/*-------------------------------------------------------------------------*/
+
+/* NOTE:  three modes are possible here, only one of which
+ * will be standards-conformant on any given system:
+ *
+ *  - OTG mode (dual-role), required if there's a Mini-AB connector
+ *  - HOST mode, for when there's one or more A (host) connectors
+ *  - DEVICE mode, for when there's a B/Mini-B (device) connector
+ *
+ * As a rule, you won't have an isp1301 chip unless it's there to
+ * support the OTG mode.  Other modes help testing USB controllers
+ * in isolation from (full) OTG support, or maybe so later board
+ * revisions can help to support those feature.
+ */
+
+#ifdef	CONFIG_USB_OTG
+
+static int isp1301_otg_enable(struct isp1301 *isp)
+{
+	power_up(isp);
+	otg_init(isp);
+
+	/* NOTE:  since we don't change this, this provides
+	 * a few more interrupts than are strictly needed.
+	 */
+	isp1301_set_bits(isp, ISP1301_INTERRUPT_RISING,
+		INTR_VBUS_VLD | INTR_SESS_VLD | INTR_ID_GND);
+	isp1301_set_bits(isp, ISP1301_INTERRUPT_FALLING,
+		INTR_VBUS_VLD | INTR_SESS_VLD | INTR_ID_GND);
+
+	dev_info(&isp->client->dev, "ready for dual-role USB ...\n");
+
+	return 0;
+}
+
+#endif
+
+/* add or disable the host device+driver */
+static int
+isp1301_set_host(struct otg_transceiver *otg, struct usb_bus *host)
+{
+	struct isp1301	*isp = container_of(otg, struct isp1301, otg);
+
+	if (!otg || isp != the_transceiver)
+		return -ENODEV;
+
+	if (!host) {
+		omap_writew(0, OTG_IRQ_EN);
+		power_down(isp);
+		isp->otg.host = NULL;
+		return 0;
+	}
+
+#ifdef	CONFIG_USB_OTG
+	isp->otg.host = host;
+	dev_dbg(&isp->client->dev, "registered host\n");
+	host_suspend(isp);
+	if (isp->otg.gadget)
+		return isp1301_otg_enable(isp);
+	return 0;
+
+#elif	!defined(CONFIG_USB_GADGET_OMAP)
+	// FIXME update its refcount
+	isp->otg.host = host;
+
+	power_up(isp);
+
+	if (machine_is_omap_h2())
+		isp1301_set_bits(isp, ISP1301_MODE_CONTROL_1, MC1_DAT_SE0);
+
+	dev_info(&isp->client->dev, "A-Host sessions ok\n");
+	isp1301_set_bits(isp, ISP1301_INTERRUPT_RISING,
+		INTR_ID_GND);
+	isp1301_set_bits(isp, ISP1301_INTERRUPT_FALLING,
+		INTR_ID_GND);
+
+	/* If this has a Mini-AB connector, this mode is highly
+	 * nonstandard ... but can be handy for testing, especially with
+	 * the Mini-A end of an OTG cable.  (Or something nonstandard
+	 * like MiniB-to-StandardB, maybe built with a gender mender.)
+	 */
+	isp1301_set_bits(isp, ISP1301_OTG_CONTROL_1, OTG1_VBUS_DRV);
+
+	dump_regs(isp, __func__);
+
+	return 0;
+
+#else
+	dev_dbg(&isp->client->dev, "host sessions not allowed\n");
+	return -EINVAL;
+#endif
+
+}
+
+static int
+isp1301_set_peripheral(struct otg_transceiver *otg, struct usb_gadget *gadget)
+{
+	struct isp1301	*isp = container_of(otg, struct isp1301, otg);
+#ifndef	CONFIG_USB_OTG
+	u32 l;
+#endif
+
+	if (!otg || isp != the_transceiver)
+		return -ENODEV;
+
+	if (!gadget) {
+		omap_writew(0, OTG_IRQ_EN);
+		if (!isp->otg.default_a)
+			enable_vbus_draw(isp, 0);
+		usb_gadget_vbus_disconnect(isp->otg.gadget);
+		isp->otg.gadget = NULL;
+		power_down(isp);
+		return 0;
+	}
+
+#ifdef	CONFIG_USB_OTG
+	isp->otg.gadget = gadget;
+	dev_dbg(&isp->client->dev, "registered gadget\n");
+	/* gadget driver may be suspended until vbus_connect () */
+	if (isp->otg.host)
+		return isp1301_otg_enable(isp);
+	return 0;
+
+#elif	!defined(CONFIG_USB_OHCI_HCD) && !defined(CONFIG_USB_OHCI_HCD_MODULE)
+	isp->otg.gadget = gadget;
+	// FIXME update its refcount
+
+	l = omap_readl(OTG_CTRL) & OTG_CTRL_MASK;
+	l &= ~(OTG_XCEIV_OUTPUTS|OTG_CTRL_BITS);
+	l |= OTG_ID;
+	omap_writel(l, OTG_CTRL);
+
+	power_up(isp);
+	isp->otg.state = OTG_STATE_B_IDLE;
+
+	if (machine_is_omap_h2() || machine_is_omap_h3())
+		isp1301_set_bits(isp, ISP1301_MODE_CONTROL_1, MC1_DAT_SE0);
+
+	isp1301_set_bits(isp, ISP1301_INTERRUPT_RISING,
+		INTR_SESS_VLD);
+	isp1301_set_bits(isp, ISP1301_INTERRUPT_FALLING,
+		INTR_VBUS_VLD);
+	dev_info(&isp->client->dev, "B-Peripheral sessions ok\n");
+	dump_regs(isp, __func__);
+
+	/* If this has a Mini-AB connector, this mode is highly
+	 * nonstandard ... but can be handy for testing, so long
+	 * as you don't plug a Mini-A cable into the jack.
+	 */
+	if (isp1301_get_u8(isp, ISP1301_INTERRUPT_SOURCE) & INTR_VBUS_VLD)
+		b_peripheral(isp);
+
+	return 0;
+
+#else
+	dev_dbg(&isp->client->dev, "peripheral sessions not allowed\n");
+	return -EINVAL;
+#endif
+}
+
+
+/*-------------------------------------------------------------------------*/
+
+static int
+isp1301_set_power(struct otg_transceiver *dev, unsigned mA)
+{
+	if (!the_transceiver)
+		return -ENODEV;
+	if (dev->state == OTG_STATE_B_PERIPHERAL)
+		enable_vbus_draw(the_transceiver, mA);
+	return 0;
+}
+
+static int
+isp1301_start_srp(struct otg_transceiver *dev)
+{
+	struct isp1301	*isp = container_of(dev, struct isp1301, otg);
+	u32		otg_ctrl;
+
+	if (!dev || isp != the_transceiver
+			|| isp->otg.state != OTG_STATE_B_IDLE)
+		return -ENODEV;
+
+	otg_ctrl = omap_readl(OTG_CTRL);
+	if (!(otg_ctrl & OTG_BSESSEND))
+		return -EINVAL;
+
+	otg_ctrl |= OTG_B_BUSREQ;
+	otg_ctrl &= ~OTG_A_BUSREQ & OTG_CTRL_MASK;
+	omap_writel(otg_ctrl, OTG_CTRL);
+	isp->otg.state = OTG_STATE_B_SRP_INIT;
+
+	pr_debug("otg: SRP, %s ... %06x\n", state_name(isp),
+			omap_readl(OTG_CTRL));
+#ifdef	CONFIG_USB_OTG
+	check_state(isp, __func__);
+#endif
+	return 0;
+}
+
+static int
+isp1301_start_hnp(struct otg_transceiver *dev)
+{
+#ifdef	CONFIG_USB_OTG
+	struct isp1301	*isp = container_of(dev, struct isp1301, otg);
+	u32 l;
+
+	if (!dev || isp != the_transceiver)
+		return -ENODEV;
+	if (isp->otg.default_a && (isp->otg.host == NULL
+			|| !isp->otg.host->b_hnp_enable))
+		return -ENOTCONN;
+	if (!isp->otg.default_a && (isp->otg.gadget == NULL
+			|| !isp->otg.gadget->b_hnp_enable))
+		return -ENOTCONN;
+
+	/* We want hardware to manage most HNP protocol timings.
+	 * So do this part as early as possible...
+	 */
+	switch (isp->otg.state) {
+	case OTG_STATE_B_HOST:
+		isp->otg.state = OTG_STATE_B_PERIPHERAL;
+		/* caller will suspend next */
+		break;
+	case OTG_STATE_A_HOST:
+#if 0
+		/* autoconnect mode avoids irq latency bugs */
+		isp1301_set_bits(isp, ISP1301_MODE_CONTROL_1,
+				MC1_BDIS_ACON_EN);
+#endif
+		/* caller must suspend then clear A_BUSREQ */
+		usb_gadget_vbus_connect(isp->otg.gadget);
+		l = omap_readl(OTG_CTRL);
+		l |= OTG_A_SETB_HNPEN;
+		omap_writel(l, OTG_CTRL);
+
+		break;
+	case OTG_STATE_A_PERIPHERAL:
+		/* initiated by B-Host suspend */
+		break;
+	default:
+		return -EILSEQ;
+	}
+	pr_debug("otg: HNP %s, %06x ...\n",
+		state_name(isp), omap_readl(OTG_CTRL));
+	check_state(isp, __func__);
+	return 0;
+#else
+	/* srp-only */
+	return -EINVAL;
+#endif
+}
+
+/*-------------------------------------------------------------------------*/
+
+static int __init
+isp1301_probe(struct i2c_client *i2c, const struct i2c_device_id *id)
+{
+	int			status;
+	struct isp1301		*isp;
+
+	if (the_transceiver)
+		return 0;
+
+	isp = kzalloc(sizeof *isp, GFP_KERNEL);
+	if (!isp)
+		return 0;
+
+	INIT_WORK(&isp->work, isp1301_work);
+	init_timer(&isp->timer);
+	isp->timer.function = isp1301_timer;
+	isp->timer.data = (unsigned long) isp;
+
+	i2c_set_clientdata(i2c, isp);
+	isp->client = i2c;
+
+	/* verify the chip (shouldn't be necesary) */
+	status = isp1301_get_u16(isp, ISP1301_VENDOR_ID);
+	if (status != I2C_VENDOR_ID_PHILIPS) {
+		dev_dbg(&i2c->dev, "not philips id: %d\n", status);
+		goto fail;
+	}
+	status = isp1301_get_u16(isp, ISP1301_PRODUCT_ID);
+	if (status != I2C_PRODUCT_ID_PHILIPS_1301) {
+		dev_dbg(&i2c->dev, "not isp1301, %d\n", status);
+		goto fail;
+	}
+	isp->i2c_release = i2c->dev.release;
+	i2c->dev.release = isp1301_release;
+
+	/* initial development used chiprev 2.00 */
+	status = i2c_smbus_read_word_data(i2c, ISP1301_BCD_DEVICE);
+	dev_info(&i2c->dev, "chiprev %x.%02x, driver " DRIVER_VERSION "\n",
+		status >> 8, status & 0xff);
+
+	/* make like power-on reset */
+	isp1301_clear_bits(isp, ISP1301_MODE_CONTROL_1, MC1_MASK);
+
+	isp1301_set_bits(isp, ISP1301_MODE_CONTROL_2, MC2_BI_DI);
+	isp1301_clear_bits(isp, ISP1301_MODE_CONTROL_2, ~MC2_BI_DI);
+
+	isp1301_set_bits(isp, ISP1301_OTG_CONTROL_1,
+				OTG1_DM_PULLDOWN | OTG1_DP_PULLDOWN);
+	isp1301_clear_bits(isp, ISP1301_OTG_CONTROL_1,
+				~(OTG1_DM_PULLDOWN | OTG1_DP_PULLDOWN));
+
+	isp1301_clear_bits(isp, ISP1301_INTERRUPT_LATCH, ~0);
+	isp1301_clear_bits(isp, ISP1301_INTERRUPT_FALLING, ~0);
+	isp1301_clear_bits(isp, ISP1301_INTERRUPT_RISING, ~0);
+
+#ifdef	CONFIG_USB_OTG
+	status = otg_bind(isp);
+	if (status < 0) {
+		dev_dbg(&i2c->dev, "can't bind OTG\n");
+		goto fail;
+	}
+#endif
+
+	if (machine_is_omap_h2()) {
+		/* full speed signaling by default */
+		isp1301_set_bits(isp, ISP1301_MODE_CONTROL_1,
+			MC1_SPEED);
+		isp1301_set_bits(isp, ISP1301_MODE_CONTROL_2,
+			MC2_SPD_SUSP_CTRL);
+
+		/* IRQ wired at M14 */
+		omap_cfg_reg(M14_1510_GPIO2);
+		if (gpio_request(2, "isp1301") == 0)
+			gpio_direction_input(2);
+		isp->irq_type = IRQF_TRIGGER_FALLING;
+	}
+
+	isp->irq_type |= IRQF_SAMPLE_RANDOM;
+	status = request_irq(i2c->irq, isp1301_irq,
+			isp->irq_type, DRIVER_NAME, isp);
+	if (status < 0) {
+		dev_dbg(&i2c->dev, "can't get IRQ %d, err %d\n",
+				i2c->irq, status);
+		goto fail;
+	}
+
+	isp->otg.dev = &i2c->dev;
+	isp->otg.label = DRIVER_NAME;
+
+	isp->otg.set_host = isp1301_set_host,
+	isp->otg.set_peripheral = isp1301_set_peripheral,
+	isp->otg.set_power = isp1301_set_power,
+	isp->otg.start_srp = isp1301_start_srp,
+	isp->otg.start_hnp = isp1301_start_hnp,
+
+	enable_vbus_draw(isp, 0);
+	power_down(isp);
+	the_transceiver = isp;
+
+#ifdef	CONFIG_USB_OTG
+	update_otg1(isp, isp1301_get_u8(isp, ISP1301_INTERRUPT_SOURCE));
+	update_otg2(isp, isp1301_get_u8(isp, ISP1301_OTG_STATUS));
+#endif
+
+	dump_regs(isp, __func__);
+
+#ifdef	VERBOSE
+	mod_timer(&isp->timer, jiffies + TIMER_JIFFIES);
+	dev_dbg(&i2c->dev, "scheduled timer, %d min\n", TIMER_MINUTES);
+#endif
+
+	status = otg_set_transceiver(&isp->otg);
+	if (status < 0)
+		dev_err(&i2c->dev, "can't register transceiver, %d\n",
+			status);
+
+	return 0;
+
+fail:
+	kfree(isp);
+	return -ENODEV;
+}
+
+static const struct i2c_device_id isp1301_id[] = {
+	{ "isp1301_omap", 0 },
+	{ }
+};
+MODULE_DEVICE_TABLE(i2c, isp1301_id);
+
+static struct i2c_driver isp1301_driver = {
+	.driver = {
+		.name	= "isp1301_omap",
+	},
+	.probe		= isp1301_probe,
+	.remove		= __exit_p(isp1301_remove),
+	.id_table	= isp1301_id,
+};
+
+/*-------------------------------------------------------------------------*/
+
+static int __init isp_init(void)
+{
+	return i2c_add_driver(&isp1301_driver);
+}
+module_init(isp_init);
+
+static void __exit isp_exit(void)
+{
+	if (the_transceiver)
+		otg_set_transceiver(NULL);
+	i2c_del_driver(&isp1301_driver);
+}
+module_exit(isp_exit);
+
diff --git a/drivers/usb/otg/otg.c b/drivers/usb/otg/otg.c
new file mode 100644
index 000000000000..ff318fae7d4d
--- /dev/null
+++ b/drivers/usb/otg/otg.c
@@ -0,0 +1,65 @@
+/*
+ * otg.c -- USB OTG utility code
+ *
+ * Copyright (C) 2004 Texas Instruments
+ *
+ * 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.
+ */
+
+#include <linux/kernel.h>
+#include <linux/device.h>
+
+#include <linux/usb/otg.h>
+
+static struct otg_transceiver *xceiv;
+
+/**
+ * otg_get_transceiver - find the (single) OTG transceiver
+ *
+ * Returns the transceiver driver, after getting a refcount to it; or
+ * null if there is no such transceiver.  The caller is responsible for
+ * calling otg_put_transceiver() to release that count.
+ *
+ * For use by USB host and peripheral drivers.
+ */
+struct otg_transceiver *otg_get_transceiver(void)
+{
+	if (xceiv)
+		get_device(xceiv->dev);
+	return xceiv;
+}
+EXPORT_SYMBOL(otg_get_transceiver);
+
+/**
+ * otg_put_transceiver - release the (single) OTG transceiver
+ * @x: the transceiver returned by otg_get_transceiver()
+ *
+ * Releases a refcount the caller received from otg_get_transceiver().
+ *
+ * For use by USB host and peripheral drivers.
+ */
+void otg_put_transceiver(struct otg_transceiver *x)
+{
+	put_device(x->dev);
+}
+EXPORT_SYMBOL(otg_put_transceiver);
+
+/**
+ * otg_set_transceiver - declare the (single) OTG transceiver
+ * @x: the USB OTG transceiver to be used; or NULL
+ *
+ * This call is exclusively for use by transceiver drivers, which
+ * coordinate the activities of drivers for host and peripheral
+ * controllers, and in some cases for VBUS current regulation.
+ */
+int otg_set_transceiver(struct otg_transceiver *x)
+{
+	if (xceiv && x)
+		return -EBUSY;
+	xceiv = x;
+	return 0;
+}
+EXPORT_SYMBOL(otg_set_transceiver);
diff --git a/drivers/usb/otg/twl4030-usb.c b/drivers/usb/otg/twl4030-usb.c
new file mode 100644
index 000000000000..416e4410be02
--- /dev/null
+++ b/drivers/usb/otg/twl4030-usb.c
@@ -0,0 +1,721 @@
+/*
+ * twl4030_usb - TWL4030 USB transceiver, talking to OMAP OTG controller
+ *
+ * Copyright (C) 2004-2007 Texas Instruments
+ * Copyright (C) 2008 Nokia Corporation
+ * Contact: Felipe Balbi <felipe.balbi@nokia.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., 675 Mass Ave, Cambridge, MA 02139, USA.
+ *
+ * Current status:
+ *	- HS USB ULPI mode works.
+ *	- 3-pin mode support may be added in future.
+ */
+
+#include <linux/module.h>
+#include <linux/init.h>
+#include <linux/interrupt.h>
+#include <linux/platform_device.h>
+#include <linux/spinlock.h>
+#include <linux/workqueue.h>
+#include <linux/io.h>
+#include <linux/delay.h>
+#include <linux/usb/otg.h>
+#include <linux/i2c/twl4030.h>
+
+
+/* Register defines */
+
+#define VENDOR_ID_LO			0x00
+#define VENDOR_ID_HI			0x01
+#define PRODUCT_ID_LO			0x02
+#define PRODUCT_ID_HI			0x03
+
+#define FUNC_CTRL			0x04
+#define FUNC_CTRL_SET			0x05
+#define FUNC_CTRL_CLR			0x06
+#define FUNC_CTRL_SUSPENDM		(1 << 6)
+#define FUNC_CTRL_RESET			(1 << 5)
+#define FUNC_CTRL_OPMODE_MASK		(3 << 3) /* bits 3 and 4 */
+#define FUNC_CTRL_OPMODE_NORMAL		(0 << 3)
+#define FUNC_CTRL_OPMODE_NONDRIVING	(1 << 3)
+#define FUNC_CTRL_OPMODE_DISABLE_BIT_NRZI	(2 << 3)
+#define FUNC_CTRL_TERMSELECT		(1 << 2)
+#define FUNC_CTRL_XCVRSELECT_MASK	(3 << 0) /* bits 0 and 1 */
+#define FUNC_CTRL_XCVRSELECT_HS		(0 << 0)
+#define FUNC_CTRL_XCVRSELECT_FS		(1 << 0)
+#define FUNC_CTRL_XCVRSELECT_LS		(2 << 0)
+#define FUNC_CTRL_XCVRSELECT_FS4LS	(3 << 0)
+
+#define IFC_CTRL			0x07
+#define IFC_CTRL_SET			0x08
+#define IFC_CTRL_CLR			0x09
+#define IFC_CTRL_INTERFACE_PROTECT_DISABLE	(1 << 7)
+#define IFC_CTRL_AUTORESUME		(1 << 4)
+#define IFC_CTRL_CLOCKSUSPENDM		(1 << 3)
+#define IFC_CTRL_CARKITMODE		(1 << 2)
+#define IFC_CTRL_FSLSSERIALMODE_3PIN	(1 << 1)
+
+#define TWL4030_OTG_CTRL		0x0A
+#define TWL4030_OTG_CTRL_SET		0x0B
+#define TWL4030_OTG_CTRL_CLR		0x0C
+#define TWL4030_OTG_CTRL_DRVVBUS	(1 << 5)
+#define TWL4030_OTG_CTRL_CHRGVBUS	(1 << 4)
+#define TWL4030_OTG_CTRL_DISCHRGVBUS	(1 << 3)
+#define TWL4030_OTG_CTRL_DMPULLDOWN	(1 << 2)
+#define TWL4030_OTG_CTRL_DPPULLDOWN	(1 << 1)
+#define TWL4030_OTG_CTRL_IDPULLUP	(1 << 0)
+
+#define USB_INT_EN_RISE			0x0D
+#define USB_INT_EN_RISE_SET		0x0E
+#define USB_INT_EN_RISE_CLR		0x0F
+#define USB_INT_EN_FALL			0x10
+#define USB_INT_EN_FALL_SET		0x11
+#define USB_INT_EN_FALL_CLR		0x12
+#define USB_INT_STS			0x13
+#define USB_INT_LATCH			0x14
+#define USB_INT_IDGND			(1 << 4)
+#define USB_INT_SESSEND			(1 << 3)
+#define USB_INT_SESSVALID		(1 << 2)
+#define USB_INT_VBUSVALID		(1 << 1)
+#define USB_INT_HOSTDISCONNECT		(1 << 0)
+
+#define CARKIT_CTRL			0x19
+#define CARKIT_CTRL_SET			0x1A
+#define CARKIT_CTRL_CLR			0x1B
+#define CARKIT_CTRL_MICEN		(1 << 6)
+#define CARKIT_CTRL_SPKRIGHTEN		(1 << 5)
+#define CARKIT_CTRL_SPKLEFTEN		(1 << 4)
+#define CARKIT_CTRL_RXDEN		(1 << 3)
+#define CARKIT_CTRL_TXDEN		(1 << 2)
+#define CARKIT_CTRL_IDGNDDRV		(1 << 1)
+#define CARKIT_CTRL_CARKITPWR		(1 << 0)
+#define CARKIT_PLS_CTRL			0x22
+#define CARKIT_PLS_CTRL_SET		0x23
+#define CARKIT_PLS_CTRL_CLR		0x24
+#define CARKIT_PLS_CTRL_SPKRRIGHT_BIASEN	(1 << 3)
+#define CARKIT_PLS_CTRL_SPKRLEFT_BIASEN	(1 << 2)
+#define CARKIT_PLS_CTRL_RXPLSEN		(1 << 1)
+#define CARKIT_PLS_CTRL_TXPLSEN		(1 << 0)
+
+#define MCPC_CTRL			0x30
+#define MCPC_CTRL_SET			0x31
+#define MCPC_CTRL_CLR			0x32
+#define MCPC_CTRL_RTSOL			(1 << 7)
+#define MCPC_CTRL_EXTSWR		(1 << 6)
+#define MCPC_CTRL_EXTSWC		(1 << 5)
+#define MCPC_CTRL_VOICESW		(1 << 4)
+#define MCPC_CTRL_OUT64K		(1 << 3)
+#define MCPC_CTRL_RTSCTSSW		(1 << 2)
+#define MCPC_CTRL_HS_UART		(1 << 0)
+
+#define MCPC_IO_CTRL			0x33
+#define MCPC_IO_CTRL_SET		0x34
+#define MCPC_IO_CTRL_CLR		0x35
+#define MCPC_IO_CTRL_MICBIASEN		(1 << 5)
+#define MCPC_IO_CTRL_CTS_NPU		(1 << 4)
+#define MCPC_IO_CTRL_RXD_PU		(1 << 3)
+#define MCPC_IO_CTRL_TXDTYP		(1 << 2)
+#define MCPC_IO_CTRL_CTSTYP		(1 << 1)
+#define MCPC_IO_CTRL_RTSTYP		(1 << 0)
+
+#define MCPC_CTRL2			0x36
+#define MCPC_CTRL2_SET			0x37
+#define MCPC_CTRL2_CLR			0x38
+#define MCPC_CTRL2_MCPC_CK_EN		(1 << 0)
+
+#define OTHER_FUNC_CTRL			0x80
+#define OTHER_FUNC_CTRL_SET		0x81
+#define OTHER_FUNC_CTRL_CLR		0x82
+#define OTHER_FUNC_CTRL_BDIS_ACON_EN	(1 << 4)
+#define OTHER_FUNC_CTRL_FIVEWIRE_MODE	(1 << 2)
+
+#define OTHER_IFC_CTRL			0x83
+#define OTHER_IFC_CTRL_SET		0x84
+#define OTHER_IFC_CTRL_CLR		0x85
+#define OTHER_IFC_CTRL_OE_INT_EN	(1 << 6)
+#define OTHER_IFC_CTRL_CEA2011_MODE	(1 << 5)
+#define OTHER_IFC_CTRL_FSLSSERIALMODE_4PIN	(1 << 4)
+#define OTHER_IFC_CTRL_HIZ_ULPI_60MHZ_OUT	(1 << 3)
+#define OTHER_IFC_CTRL_HIZ_ULPI		(1 << 2)
+#define OTHER_IFC_CTRL_ALT_INT_REROUTE	(1 << 0)
+
+#define OTHER_INT_EN_RISE		0x86
+#define OTHER_INT_EN_RISE_SET		0x87
+#define OTHER_INT_EN_RISE_CLR		0x88
+#define OTHER_INT_EN_FALL		0x89
+#define OTHER_INT_EN_FALL_SET		0x8A
+#define OTHER_INT_EN_FALL_CLR		0x8B
+#define OTHER_INT_STS			0x8C
+#define OTHER_INT_LATCH			0x8D
+#define OTHER_INT_VB_SESS_VLD		(1 << 7)
+#define OTHER_INT_DM_HI			(1 << 6) /* not valid for "latch" reg */
+#define OTHER_INT_DP_HI			(1 << 5) /* not valid for "latch" reg */
+#define OTHER_INT_BDIS_ACON		(1 << 3) /* not valid for "fall" regs */
+#define OTHER_INT_MANU			(1 << 1)
+#define OTHER_INT_ABNORMAL_STRESS	(1 << 0)
+
+#define ID_STATUS			0x96
+#define ID_RES_FLOAT			(1 << 4)
+#define ID_RES_440K			(1 << 3)
+#define ID_RES_200K			(1 << 2)
+#define ID_RES_102K			(1 << 1)
+#define ID_RES_GND			(1 << 0)
+
+#define POWER_CTRL			0xAC
+#define POWER_CTRL_SET			0xAD
+#define POWER_CTRL_CLR			0xAE
+#define POWER_CTRL_OTG_ENAB		(1 << 5)
+
+#define OTHER_IFC_CTRL2			0xAF
+#define OTHER_IFC_CTRL2_SET		0xB0
+#define OTHER_IFC_CTRL2_CLR		0xB1
+#define OTHER_IFC_CTRL2_ULPI_STP_LOW	(1 << 4)
+#define OTHER_IFC_CTRL2_ULPI_TXEN_POL	(1 << 3)
+#define OTHER_IFC_CTRL2_ULPI_4PIN_2430	(1 << 2)
+#define OTHER_IFC_CTRL2_USB_INT_OUTSEL_MASK	(3 << 0) /* bits 0 and 1 */
+#define OTHER_IFC_CTRL2_USB_INT_OUTSEL_INT1N	(0 << 0)
+#define OTHER_IFC_CTRL2_USB_INT_OUTSEL_INT2N	(1 << 0)
+
+#define REG_CTRL_EN			0xB2
+#define REG_CTRL_EN_SET			0xB3
+#define REG_CTRL_EN_CLR			0xB4
+#define REG_CTRL_ERROR			0xB5
+#define ULPI_I2C_CONFLICT_INTEN		(1 << 0)
+
+#define OTHER_FUNC_CTRL2		0xB8
+#define OTHER_FUNC_CTRL2_SET		0xB9
+#define OTHER_FUNC_CTRL2_CLR		0xBA
+#define OTHER_FUNC_CTRL2_VBAT_TIMER_EN	(1 << 0)
+
+/* following registers do not have separate _clr and _set registers */
+#define VBUS_DEBOUNCE			0xC0
+#define ID_DEBOUNCE			0xC1
+#define VBAT_TIMER			0xD3
+#define PHY_PWR_CTRL			0xFD
+#define PHY_PWR_PHYPWD			(1 << 0)
+#define PHY_CLK_CTRL			0xFE
+#define PHY_CLK_CTRL_CLOCKGATING_EN	(1 << 2)
+#define PHY_CLK_CTRL_CLK32K_EN		(1 << 1)
+#define REQ_PHY_DPLL_CLK		(1 << 0)
+#define PHY_CLK_CTRL_STS		0xFF
+#define PHY_DPLL_CLK			(1 << 0)
+
+/* In module TWL4030_MODULE_PM_MASTER */
+#define PROTECT_KEY			0x0E
+
+/* In module TWL4030_MODULE_PM_RECEIVER */
+#define VUSB_DEDICATED1			0x7D
+#define VUSB_DEDICATED2			0x7E
+#define VUSB1V5_DEV_GRP			0x71
+#define VUSB1V5_TYPE			0x72
+#define VUSB1V5_REMAP			0x73
+#define VUSB1V8_DEV_GRP			0x74
+#define VUSB1V8_TYPE			0x75
+#define VUSB1V8_REMAP			0x76
+#define VUSB3V1_DEV_GRP			0x77
+#define VUSB3V1_TYPE			0x78
+#define VUSB3V1_REMAP			0x79
+
+/* In module TWL4030_MODULE_INTBR */
+#define PMBR1				0x0D
+#define GPIO_USB_4PIN_ULPI_2430C	(3 << 0)
+
+
+
+enum linkstat {
+	USB_LINK_UNKNOWN = 0,
+	USB_LINK_NONE,
+	USB_LINK_VBUS,
+	USB_LINK_ID,
+};
+
+struct twl4030_usb {
+	struct otg_transceiver	otg;
+	struct device		*dev;
+
+	/* for vbus reporting with irqs disabled */
+	spinlock_t		lock;
+
+	/* pin configuration */
+	enum twl4030_usb_mode	usb_mode;
+
+	int			irq;
+	u8			linkstat;
+	u8			asleep;
+	bool			irq_enabled;
+};
+
+/* internal define on top of container_of */
+#define xceiv_to_twl(x)		container_of((x), struct twl4030_usb, otg);
+
+/*-------------------------------------------------------------------------*/
+
+static int twl4030_i2c_write_u8_verify(struct twl4030_usb *twl,
+		u8 module, u8 data, u8 address)
+{
+	u8 check;
+
+	if ((twl4030_i2c_write_u8(module, data, address) >= 0) &&
+	    (twl4030_i2c_read_u8(module, &check, address) >= 0) &&
+						(check == data))
+		return 0;
+	dev_dbg(twl->dev, "Write%d[%d,0x%x] wrote %02x but read %02x\n",
+			1, module, address, check, data);
+
+	/* Failed once: Try again */
+	if ((twl4030_i2c_write_u8(module, data, address) >= 0) &&
+	    (twl4030_i2c_read_u8(module, &check, address) >= 0) &&
+						(check == data))
+		return 0;
+	dev_dbg(twl->dev, "Write%d[%d,0x%x] wrote %02x but read %02x\n",
+			2, module, address, check, data);
+
+	/* Failed again: Return error */
+	return -EBUSY;
+}
+
+#define twl4030_usb_write_verify(twl, address, data)	\
+	twl4030_i2c_write_u8_verify(twl, TWL4030_MODULE_USB, (data), (address))
+
+static inline int twl4030_usb_write(struct twl4030_usb *twl,
+		u8 address, u8 data)
+{
+	int ret = 0;
+
+	ret = twl4030_i2c_write_u8(TWL4030_MODULE_USB, data, address);
+	if (ret < 0)
+		dev_dbg(twl->dev,
+			"TWL4030:USB:Write[0x%x] Error %d\n", address, ret);
+	return ret;
+}
+
+static inline int twl4030_readb(struct twl4030_usb *twl, u8 module, u8 address)
+{
+	u8 data;
+	int ret = 0;
+
+	ret = twl4030_i2c_read_u8(module, &data, address);
+	if (ret >= 0)
+		ret = data;
+	else
+		dev_dbg(twl->dev,
+			"TWL4030:readb[0x%x,0x%x] Error %d\n",
+					module, address, ret);
+
+	return ret;
+}
+
+static inline int twl4030_usb_read(struct twl4030_usb *twl, u8 address)
+{
+	return twl4030_readb(twl, TWL4030_MODULE_USB, address);
+}
+
+/*-------------------------------------------------------------------------*/
+
+static inline int
+twl4030_usb_set_bits(struct twl4030_usb *twl, u8 reg, u8 bits)
+{
+	return twl4030_usb_write(twl, reg + 1, bits);
+}
+
+static inline int
+twl4030_usb_clear_bits(struct twl4030_usb *twl, u8 reg, u8 bits)
+{
+	return twl4030_usb_write(twl, reg + 2, bits);
+}
+
+/*-------------------------------------------------------------------------*/
+
+static enum linkstat twl4030_usb_linkstat(struct twl4030_usb *twl)
+{
+	int	status;
+	int	linkstat = USB_LINK_UNKNOWN;
+
+	/* STS_HW_CONDITIONS */
+	status = twl4030_readb(twl, TWL4030_MODULE_PM_MASTER, 0x0f);
+	if (status < 0)
+		dev_err(twl->dev, "USB link status err %d\n", status);
+	else if (status & BIT(7))
+		linkstat = USB_LINK_VBUS;
+	else if (status & BIT(2))
+		linkstat = USB_LINK_ID;
+	else
+		linkstat = USB_LINK_NONE;
+
+	dev_dbg(twl->dev, "HW_CONDITIONS 0x%02x/%d; link %d\n",
+			status, status, linkstat);
+
+	/* REVISIT this assumes host and peripheral controllers
+	 * are registered, and that both are active...
+	 */
+
+	spin_lock_irq(&twl->lock);
+	twl->linkstat = linkstat;
+	if (linkstat == USB_LINK_ID) {
+		twl->otg.default_a = true;
+		twl->otg.state = OTG_STATE_A_IDLE;
+	} else {
+		twl->otg.default_a = false;
+		twl->otg.state = OTG_STATE_B_IDLE;
+	}
+	spin_unlock_irq(&twl->lock);
+
+	return linkstat;
+}
+
+static void twl4030_usb_set_mode(struct twl4030_usb *twl, int mode)
+{
+	twl->usb_mode = mode;
+
+	switch (mode) {
+	case T2_USB_MODE_ULPI:
+		twl4030_usb_clear_bits(twl, IFC_CTRL, IFC_CTRL_CARKITMODE);
+		twl4030_usb_set_bits(twl, POWER_CTRL, POWER_CTRL_OTG_ENAB);
+		twl4030_usb_clear_bits(twl, FUNC_CTRL,
+					FUNC_CTRL_XCVRSELECT_MASK |
+					FUNC_CTRL_OPMODE_MASK);
+		break;
+	case -1:
+		/* FIXME: power on defaults */
+		break;
+	default:
+		dev_err(twl->dev, "unsupported T2 transceiver mode %d\n",
+				mode);
+		break;
+	};
+}
+
+static void twl4030_i2c_access(struct twl4030_usb *twl, int on)
+{
+	unsigned long timeout;
+	int val = twl4030_usb_read(twl, PHY_CLK_CTRL);
+
+	if (val >= 0) {
+		if (on) {
+			/* enable DPLL to access PHY registers over I2C */
+			val |= REQ_PHY_DPLL_CLK;
+			WARN_ON(twl4030_usb_write_verify(twl, PHY_CLK_CTRL,
+						(u8)val) < 0);
+
+			timeout = jiffies + HZ;
+			while (!(twl4030_usb_read(twl, PHY_CLK_CTRL_STS) &
+							PHY_DPLL_CLK)
+				&& time_before(jiffies, timeout))
+					udelay(10);
+			if (!(twl4030_usb_read(twl, PHY_CLK_CTRL_STS) &
+							PHY_DPLL_CLK))
+				dev_err(twl->dev, "Timeout setting T2 HSUSB "
+						"PHY DPLL clock\n");
+		} else {
+			/* let ULPI control the DPLL clock */
+			val &= ~REQ_PHY_DPLL_CLK;
+			WARN_ON(twl4030_usb_write_verify(twl, PHY_CLK_CTRL,
+						(u8)val) < 0);
+		}
+	}
+}
+
+static void twl4030_phy_power(struct twl4030_usb *twl, int on)
+{
+	u8 pwr;
+
+	pwr = twl4030_usb_read(twl, PHY_PWR_CTRL);
+	if (on) {
+		pwr &= ~PHY_PWR_PHYPWD;
+		WARN_ON(twl4030_usb_write_verify(twl, PHY_PWR_CTRL, pwr) < 0);
+		twl4030_usb_write(twl, PHY_CLK_CTRL,
+				  twl4030_usb_read(twl, PHY_CLK_CTRL) |
+					(PHY_CLK_CTRL_CLOCKGATING_EN |
+						PHY_CLK_CTRL_CLK32K_EN));
+	} else  {
+		pwr |= PHY_PWR_PHYPWD;
+		WARN_ON(twl4030_usb_write_verify(twl, PHY_PWR_CTRL, pwr) < 0);
+	}
+}
+
+static void twl4030_phy_suspend(struct twl4030_usb *twl, int controller_off)
+{
+	if (twl->asleep)
+		return;
+
+	twl4030_phy_power(twl, 0);
+	twl->asleep = 1;
+}
+
+static void twl4030_phy_resume(struct twl4030_usb *twl)
+{
+	if (!twl->asleep)
+		return;
+
+	twl4030_phy_power(twl, 1);
+	twl4030_i2c_access(twl, 1);
+	twl4030_usb_set_mode(twl, twl->usb_mode);
+	if (twl->usb_mode == T2_USB_MODE_ULPI)
+		twl4030_i2c_access(twl, 0);
+	twl->asleep = 0;
+}
+
+static void twl4030_usb_ldo_init(struct twl4030_usb *twl)
+{
+	/* Enable writing to power configuration registers */
+	twl4030_i2c_write_u8(TWL4030_MODULE_PM_MASTER, 0xC0, PROTECT_KEY);
+	twl4030_i2c_write_u8(TWL4030_MODULE_PM_MASTER, 0x0C, PROTECT_KEY);
+
+	/* put VUSB3V1 LDO in active state */
+	twl4030_i2c_write_u8(TWL4030_MODULE_PM_RECEIVER, 0, VUSB_DEDICATED2);
+
+	/* input to VUSB3V1 LDO is from VBAT, not VBUS */
+	twl4030_i2c_write_u8(TWL4030_MODULE_PM_RECEIVER, 0x14, VUSB_DEDICATED1);
+
+	/* turn on 3.1V regulator */
+	twl4030_i2c_write_u8(TWL4030_MODULE_PM_RECEIVER, 0x20, VUSB3V1_DEV_GRP);
+	twl4030_i2c_write_u8(TWL4030_MODULE_PM_RECEIVER, 0, VUSB3V1_TYPE);
+
+	/* turn on 1.5V regulator */
+	twl4030_i2c_write_u8(TWL4030_MODULE_PM_RECEIVER, 0x20, VUSB1V5_DEV_GRP);
+	twl4030_i2c_write_u8(TWL4030_MODULE_PM_RECEIVER, 0, VUSB1V5_TYPE);
+
+	/* turn on 1.8V regulator */
+	twl4030_i2c_write_u8(TWL4030_MODULE_PM_RECEIVER, 0x20, VUSB1V8_DEV_GRP);
+	twl4030_i2c_write_u8(TWL4030_MODULE_PM_RECEIVER, 0, VUSB1V8_TYPE);
+
+	/* disable access to power configuration registers */
+	twl4030_i2c_write_u8(TWL4030_MODULE_PM_MASTER, 0, PROTECT_KEY);
+}
+
+static ssize_t twl4030_usb_vbus_show(struct device *dev,
+		struct device_attribute *attr, char *buf)
+{
+	struct twl4030_usb *twl = dev_get_drvdata(dev);
+	unsigned long flags;
+	int ret = -EINVAL;
+
+	spin_lock_irqsave(&twl->lock, flags);
+	ret = sprintf(buf, "%s\n",
+			(twl->linkstat == USB_LINK_VBUS) ? "on" : "off");
+	spin_unlock_irqrestore(&twl->lock, flags);
+
+	return ret;
+}
+static DEVICE_ATTR(vbus, 0444, twl4030_usb_vbus_show, NULL);
+
+static irqreturn_t twl4030_usb_irq(int irq, void *_twl)
+{
+	struct twl4030_usb *twl = _twl;
+	int status;
+
+#ifdef CONFIG_LOCKDEP
+	/* WORKAROUND for lockdep forcing IRQF_DISABLED on us, which
+	 * we don't want and can't tolerate.  Although it might be
+	 * friendlier not to borrow this thread context...
+	 */
+	local_irq_enable();
+#endif
+
+	status = twl4030_usb_linkstat(twl);
+	if (status != USB_LINK_UNKNOWN) {
+
+		/* FIXME add a set_power() method so that B-devices can
+		 * configure the charger appropriately.  It's not always
+		 * correct to consume VBUS power, and how much current to
+		 * consume is a function of the USB configuration chosen
+		 * by the host.
+		 *
+		 * REVISIT usb_gadget_vbus_connect(...) as needed, ditto
+		 * its disconnect() sibling, when changing to/from the
+		 * USB_LINK_VBUS state.  musb_hdrc won't care until it
+		 * starts to handle softconnect right.
+		 */
+		twl4030charger_usb_en(status == USB_LINK_VBUS);
+
+		if (status == USB_LINK_NONE)
+			twl4030_phy_suspend(twl, 0);
+		else
+			twl4030_phy_resume(twl);
+	}
+	sysfs_notify(&twl->dev->kobj, NULL, "vbus");
+
+	return IRQ_HANDLED;
+}
+
+static int twl4030_set_suspend(struct otg_transceiver *x, int suspend)
+{
+	struct twl4030_usb *twl = xceiv_to_twl(x);
+
+	if (suspend)
+		twl4030_phy_suspend(twl, 1);
+	else
+		twl4030_phy_resume(twl);
+
+	return 0;
+}
+
+static int twl4030_set_peripheral(struct otg_transceiver *x,
+		struct usb_gadget *gadget)
+{
+	struct twl4030_usb *twl;
+
+	if (!x)
+		return -ENODEV;
+
+	twl = xceiv_to_twl(x);
+	twl->otg.gadget = gadget;
+	if (!gadget)
+		twl->otg.state = OTG_STATE_UNDEFINED;
+
+	return 0;
+}
+
+static int twl4030_set_host(struct otg_transceiver *x, struct usb_bus *host)
+{
+	struct twl4030_usb *twl;
+
+	if (!x)
+		return -ENODEV;
+
+	twl = xceiv_to_twl(x);
+	twl->otg.host = host;
+	if (!host)
+		twl->otg.state = OTG_STATE_UNDEFINED;
+
+	return 0;
+}
+
+static int __init twl4030_usb_probe(struct platform_device *pdev)
+{
+	struct twl4030_usb_data *pdata = pdev->dev.platform_data;
+	struct twl4030_usb	*twl;
+	int			status;
+
+	if (!pdata) {
+		dev_dbg(&pdev->dev, "platform_data not available\n");
+		return -EINVAL;
+	}
+
+	twl = kzalloc(sizeof *twl, GFP_KERNEL);
+	if (!twl)
+		return -ENOMEM;
+
+	twl->dev		= &pdev->dev;
+	twl->irq		= platform_get_irq(pdev, 0);
+	twl->otg.dev		= twl->dev;
+	twl->otg.label		= "twl4030";
+	twl->otg.set_host	= twl4030_set_host;
+	twl->otg.set_peripheral	= twl4030_set_peripheral;
+	twl->otg.set_suspend	= twl4030_set_suspend;
+	twl->usb_mode		= pdata->usb_mode;
+	twl->asleep		= 1;
+
+	/* init spinlock for workqueue */
+	spin_lock_init(&twl->lock);
+
+	twl4030_usb_ldo_init(twl);
+	otg_set_transceiver(&twl->otg);
+
+	platform_set_drvdata(pdev, twl);
+	if (device_create_file(&pdev->dev, &dev_attr_vbus))
+		dev_warn(&pdev->dev, "could not create sysfs file\n");
+
+	/* Our job is to use irqs and status from the power module
+	 * to keep the transceiver disabled when nothing's connected.
+	 *
+	 * FIXME we actually shouldn't start enabling it until the
+	 * USB controller drivers have said they're ready, by calling
+	 * set_host() and/or set_peripheral() ... OTG_capable boards
+	 * need both handles, otherwise just one suffices.
+	 */
+	twl->irq_enabled = true;
+	status = request_irq(twl->irq, twl4030_usb_irq,
+			IRQF_TRIGGER_FALLING | IRQF_TRIGGER_RISING,
+			"twl4030_usb", twl);
+	if (status < 0) {
+		dev_dbg(&pdev->dev, "can't get IRQ %d, err %d\n",
+			twl->irq, status);
+		kfree(twl);
+		return status;
+	}
+
+	/* The IRQ handler just handles changes from the previous states
+	 * of the ID and VBUS pins ... in probe() we must initialize that
+	 * previous state.  The easy way:  fake an IRQ.
+	 *
+	 * REVISIT:  a real IRQ might have happened already, if PREEMPT is
+	 * enabled.  Else the IRQ may not yet be configured or enabled,
+	 * because of scheduling delays.
+	 */
+	twl4030_usb_irq(twl->irq, twl);
+
+	dev_info(&pdev->dev, "Initialized TWL4030 USB module\n");
+	return 0;
+}
+
+static int __exit twl4030_usb_remove(struct platform_device *pdev)
+{
+	struct twl4030_usb *twl = platform_get_drvdata(pdev);
+	int val;
+
+	free_irq(twl->irq, twl);
+	device_remove_file(twl->dev, &dev_attr_vbus);
+
+	/* set transceiver mode to power on defaults */
+	twl4030_usb_set_mode(twl, -1);
+
+	/* autogate 60MHz ULPI clock,
+	 * clear dpll clock request for i2c access,
+	 * disable 32KHz
+	 */
+	val = twl4030_usb_read(twl, PHY_CLK_CTRL);
+	if (val >= 0) {
+		val |= PHY_CLK_CTRL_CLOCKGATING_EN;
+		val &= ~(PHY_CLK_CTRL_CLK32K_EN | REQ_PHY_DPLL_CLK);
+		twl4030_usb_write(twl, PHY_CLK_CTRL, (u8)val);
+	}
+
+	/* disable complete OTG block */
+	twl4030_usb_clear_bits(twl, POWER_CTRL, POWER_CTRL_OTG_ENAB);
+
+	twl4030_phy_power(twl, 0);
+
+	kfree(twl);
+
+	return 0;
+}
+
+static struct platform_driver twl4030_usb_driver = {
+	.probe		= twl4030_usb_probe,
+	.remove		= __exit_p(twl4030_usb_remove),
+	.driver		= {
+		.name	= "twl4030_usb",
+		.owner	= THIS_MODULE,
+	},
+};
+
+static int __init twl4030_usb_init(void)
+{
+	return platform_driver_register(&twl4030_usb_driver);
+}
+subsys_initcall(twl4030_usb_init);
+
+static void __exit twl4030_usb_exit(void)
+{
+	platform_driver_unregister(&twl4030_usb_driver);
+}
+module_exit(twl4030_usb_exit);
+
+MODULE_ALIAS("platform:twl4030_usb");
+MODULE_AUTHOR("Texas Instruments, Inc, Nokia Corporation");
+MODULE_DESCRIPTION("TWL4030 USB transceiver driver");
+MODULE_LICENSE("GPL");