Merge branch 'devel-stable' into devel

Conflicts:
	MAINTAINERS
	arch/arm/mm/fault.c

4 files changed, 1 insertions, 1930 deletions

diff --git a/drivers/usb/otg/Kconfig b/drivers/usb/otg/Kconfig
index 69feeec1628..aa884d072f0 100644
--- a/drivers/usb/otg/Kconfig
+++ b/drivers/usb/otg/Kconfig
@@ -59,18 +59,4 @@ config NOP_USB_XCEIV
 	 built-in with usb ip or which are autonomous and doesn't require any
 	 phy programming such as ISP1x04 etc.
 
-config USB_LANGWELL_OTG
-	tristate "Intel Langwell USB OTG dual-role support"
-	depends on USB && MRST
-	select USB_OTG
-	select USB_OTG_UTILS
-	help
-	  Say Y here if you want to build Intel Langwell USB OTG
-	  transciever driver in kernel. This driver implements role
-	  switch between EHCI host driver and Langwell USB OTG
-	  client driver.
-
-	  To compile this driver as a module, choose M here: the
-	  module will be called langwell_otg.
-
 endif # USB || OTG
diff --git a/drivers/usb/otg/Makefile b/drivers/usb/otg/Makefile
index 6d1abdd3c0a..20816785652 100644
--- a/drivers/usb/otg/Makefile
+++ b/drivers/usb/otg/Makefile
@@ -9,7 +9,6 @@ obj-$(CONFIG_USB_OTG_UTILS)	+= otg.o
 obj-$(CONFIG_USB_GPIO_VBUS)	+= gpio_vbus.o
 obj-$(CONFIG_ISP1301_OMAP)	+= isp1301_omap.o
 obj-$(CONFIG_TWL4030_USB)	+= twl4030-usb.o
-obj-$(CONFIG_USB_LANGWELL_OTG)	+= langwell_otg.o
 obj-$(CONFIG_NOP_USB_XCEIV)	+= nop-usb-xceiv.o
 
 ccflags-$(CONFIG_USB_DEBUG)	+= -DDEBUG
diff --git a/drivers/usb/otg/langwell_otg.c b/drivers/usb/otg/langwell_otg.c
deleted file mode 100644
index 6f628d0e9f3..00000000000
--- a/drivers/usb/otg/langwell_otg.c
+++ /dev/null
@@ -1,1915 +0,0 @@
-/*
- * Intel Langwell USB OTG transceiver driver
- * Copyright (C) 2008 - 2009, Intel Corporation.
- *
- * This program is free software; you can redistribute it and/or modify it
- * under the terms and conditions of the GNU General Public License,
- * version 2, as published by the Free Software Foundation.
- *
- * This program is distributed in the hope 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.,
- * 51 Franklin St - Fifth Floor, Boston, MA 02110-1301 USA.
- *
- */
-/* This driver helps to switch Langwell OTG controller function between host
- * and peripheral. It works with EHCI driver and Langwell client controller
- * driver together.
- */
-#include <linux/module.h>
-#include <linux/init.h>
-#include <linux/pci.h>
-#include <linux/errno.h>
-#include <linux/interrupt.h>
-#include <linux/kernel.h>
-#include <linux/device.h>
-#include <linux/moduleparam.h>
-#include <linux/usb/ch9.h>
-#include <linux/usb/gadget.h>
-#include <linux/usb.h>
-#include <linux/usb/otg.h>
-#include <linux/notifier.h>
-#include <asm/ipc_defs.h>
-#include <linux/delay.h>
-#include "../core/hcd.h"
-
-#include <linux/usb/langwell_otg.h>
-
-#define	DRIVER_DESC		"Intel Langwell USB OTG transceiver driver"
-#define	DRIVER_VERSION		"3.0.0.32L.0002"
-
-MODULE_DESCRIPTION(DRIVER_DESC);
-MODULE_AUTHOR("Henry Yuan <hang.yuan@intel.com>, Hao Wu <hao.wu@intel.com>");
-MODULE_VERSION(DRIVER_VERSION);
-MODULE_LICENSE("GPL");
-
-static const char driver_name[] = "langwell_otg";
-
-static int langwell_otg_probe(struct pci_dev *pdev,
-			const struct pci_device_id *id);
-static void langwell_otg_remove(struct pci_dev *pdev);
-static int langwell_otg_suspend(struct pci_dev *pdev, pm_message_t message);
-static int langwell_otg_resume(struct pci_dev *pdev);
-
-static int langwell_otg_set_host(struct otg_transceiver *otg,
-				struct usb_bus *host);
-static int langwell_otg_set_peripheral(struct otg_transceiver *otg,
-				struct usb_gadget *gadget);
-static int langwell_otg_start_srp(struct otg_transceiver *otg);
-
-static const struct pci_device_id pci_ids[] = {{
-	.class =        ((PCI_CLASS_SERIAL_USB << 8) | 0xfe),
-	.class_mask =   ~0,
-	.vendor =	0x8086,
-	.device =	0x0811,
-	.subvendor =	PCI_ANY_ID,
-	.subdevice =	PCI_ANY_ID,
-}, { /* end: all zeroes */ }
-};
-
-static struct pci_driver otg_pci_driver = {
-	.name =		(char *) driver_name,
-	.id_table =	pci_ids,
-
-	.probe =	langwell_otg_probe,
-	.remove =	langwell_otg_remove,
-
-	.suspend =	langwell_otg_suspend,
-	.resume =	langwell_otg_resume,
-};
-
-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";
-	}
-}
-
-/* HSM timers */
-static inline struct langwell_otg_timer *otg_timer_initializer
-(void (*function)(unsigned long), unsigned long expires, unsigned long data)
-{
-	struct langwell_otg_timer *timer;
-	timer = kmalloc(sizeof(struct langwell_otg_timer), GFP_KERNEL);
-	timer->function = function;
-	timer->expires = expires;
-	timer->data = data;
-	return timer;
-}
-
-static struct langwell_otg_timer *a_wait_vrise_tmr, *a_wait_bcon_tmr,
-	*a_aidl_bdis_tmr, *b_ase0_brst_tmr, *b_se0_srp_tmr, *b_srp_res_tmr,
-	*b_bus_suspend_tmr;
-
-static struct list_head active_timers;
-
-static struct langwell_otg *the_transceiver;
-
-/* host/client notify transceiver when event affects HNP state */
-void langwell_update_transceiver()
-{
-	otg_dbg("transceiver driver is notified\n");
-	queue_work(the_transceiver->qwork, &the_transceiver->work);
-}
-EXPORT_SYMBOL(langwell_update_transceiver);
-
-static int langwell_otg_set_host(struct otg_transceiver *otg,
-					struct usb_bus *host)
-{
-	otg->host = host;
-
-	return 0;
-}
-
-static int langwell_otg_set_peripheral(struct otg_transceiver *otg,
-					struct usb_gadget *gadget)
-{
-	otg->gadget = gadget;
-
-	return 0;
-}
-
-static int langwell_otg_set_power(struct otg_transceiver *otg,
-				unsigned mA)
-{
-	return 0;
-}
-
-/* A-device drives vbus, controlled through PMIC CHRGCNTL register*/
-static void langwell_otg_drv_vbus(int on)
-{
-	struct ipc_pmic_reg_data	pmic_data = {0};
-	struct ipc_pmic_reg_data	battery_data;
-
-	/* Check if battery is attached or not */
-	battery_data.pmic_reg_data[0].register_address = 0xd2;
-	battery_data.ioc = 0;
-	battery_data.num_entries = 1;
-	if (ipc_pmic_register_read(&battery_data)) {
-		otg_dbg("Failed to read PMIC register 0xd2.\n");
-		return;
-	}
-
-	if ((battery_data.pmic_reg_data[0].value & 0x20) == 0) {
-		otg_dbg("no battery attached\n");
-		return;
-	}
-
-	/* Workaround for battery attachment issue */
-	if (battery_data.pmic_reg_data[0].value == 0x34) {
-		otg_dbg("battery \n");
-		return;
-	}
-
-	otg_dbg("battery attached\n");
-
-	pmic_data.ioc = 0;
-	pmic_data.pmic_reg_data[0].register_address = 0xD4;
-	pmic_data.num_entries = 1;
-	if (on)
-		pmic_data.pmic_reg_data[0].value = 0x20;
-	else
-		pmic_data.pmic_reg_data[0].value = 0xc0;
-
-	if (ipc_pmic_register_write(&pmic_data, TRUE))
-		otg_dbg("Failed to write PMIC.\n");
-
-}
-
-/* charge vbus or discharge vbus through a resistor to ground */
-static void langwell_otg_chrg_vbus(int on)
-{
-
-	u32	val;
-
-	val = readl(the_transceiver->regs + CI_OTGSC);
-
-	if (on)
-		writel((val & ~OTGSC_INTSTS_MASK) | OTGSC_VC,
-				the_transceiver->regs + CI_OTGSC);
-	else
-		writel((val & ~OTGSC_INTSTS_MASK) | OTGSC_VD,
-				the_transceiver->regs + CI_OTGSC);
-
-}
-
-/* Start SRP */
-static int langwell_otg_start_srp(struct otg_transceiver *otg)
-{
-	u32	val;
-
-	otg_dbg("Start SRP ->\n");
-
-	val = readl(the_transceiver->regs + CI_OTGSC);
-
-	writel((val & ~OTGSC_INTSTS_MASK) | OTGSC_HADP,
-		the_transceiver->regs + CI_OTGSC);
-
-	/* Check if the data plus is finished or not */
-	msleep(8);
-	val = readl(the_transceiver->regs + CI_OTGSC);
-	if (val & (OTGSC_HADP | OTGSC_DP))
-		otg_dbg("DataLine SRP Error\n");
-
-	/* FIXME: VBus SRP */
-
-	return 0;
-}
-
-
-/* stop SOF via bus_suspend */
-static void langwell_otg_loc_sof(int on)
-{
-	struct usb_hcd	*hcd;
-	int		err;
-
-	otg_dbg("loc_sof -> %d\n", on);
-
-	hcd = bus_to_hcd(the_transceiver->otg.host);
-	if (on)
-		err = hcd->driver->bus_resume(hcd);
-	else
-		err = hcd->driver->bus_suspend(hcd);
-
-	if (err)
-		otg_dbg("Failed to resume/suspend bus - %d\n", err);
-}
-
-static void langwell_otg_phy_low_power(int on)
-{
-	u32	val;
-
-	otg_dbg("phy low power mode-> %d\n", on);
-
-	val = readl(the_transceiver->regs + CI_HOSTPC1);
-	if (on)
-		writel(val | HOSTPC1_PHCD, the_transceiver->regs + CI_HOSTPC1);
-	else
-		writel(val & ~HOSTPC1_PHCD, the_transceiver->regs + CI_HOSTPC1);
-}
-
-/* Enable/Disable OTG interrupt */
-static void langwell_otg_intr(int on)
-{
-	u32 val;
-
-	otg_dbg("interrupt -> %d\n", on);
-
-	val = readl(the_transceiver->regs + CI_OTGSC);
-	if (on) {
-		val = val | (OTGSC_INTEN_MASK | OTGSC_IDPU);
-		writel(val, the_transceiver->regs + CI_OTGSC);
-	} else {
-		val = val & ~(OTGSC_INTEN_MASK | OTGSC_IDPU);
-		writel(val, the_transceiver->regs + CI_OTGSC);
-	}
-}
-
-/* set HAAR: Hardware Assist Auto-Reset */
-static void langwell_otg_HAAR(int on)
-{
-	u32	val;
-
-	otg_dbg("HAAR -> %d\n", on);
-
-	val = readl(the_transceiver->regs + CI_OTGSC);
-	if (on)
-		writel((val & ~OTGSC_INTSTS_MASK) | OTGSC_HAAR,
-				the_transceiver->regs + CI_OTGSC);
-	else
-		writel((val & ~OTGSC_INTSTS_MASK) & ~OTGSC_HAAR,
-				the_transceiver->regs + CI_OTGSC);
-}
-
-/* set HABA: Hardware Assist B-Disconnect to A-Connect */
-static void langwell_otg_HABA(int on)
-{
-	u32	val;
-
-	otg_dbg("HABA -> %d\n", on);
-
-	val = readl(the_transceiver->regs + CI_OTGSC);
-	if (on)
-		writel((val & ~OTGSC_INTSTS_MASK) | OTGSC_HABA,
-				the_transceiver->regs + CI_OTGSC);
-	else
-		writel((val & ~OTGSC_INTSTS_MASK) & ~OTGSC_HABA,
-				the_transceiver->regs + CI_OTGSC);
-}
-
-static int langwell_otg_check_se0_srp(int on)
-{
-	u32 val;
-
-	int delay_time = TB_SE0_SRP * 10; /* step is 100us */
-
-	otg_dbg("check_se0_srp -> \n");
-
-	do {
-		udelay(100);
-		if (!delay_time--)
-			break;
-		val = readl(the_transceiver->regs + CI_PORTSC1);
-		val &= PORTSC_LS;
-	} while (!val);
-
-	otg_dbg("check_se0_srp <- \n");
-	return val;
-}
-
-/* The timeout callback function to set time out bit */
-static void set_tmout(unsigned long indicator)
-{
-	*(int *)indicator = 1;
-}
-
-void langwell_otg_nsf_msg(unsigned long indicator)
-{
-	switch (indicator) {
-	case 2:
-	case 4:
-	case 6:
-	case 7:
-		printk(KERN_ERR "OTG:NSF-%lu - deivce not responding\n",
-				indicator);
-		break;
-	case 3:
-		printk(KERN_ERR "OTG:NSF-%lu - deivce not supported\n",
-				indicator);
-		break;
-	default:
-		printk(KERN_ERR "Do not have this kind of NSF\n");
-		break;
-	}
-}
-
-/* Initialize timers */
-static void langwell_otg_init_timers(struct otg_hsm *hsm)
-{
-	/* HSM used timers */
-	a_wait_vrise_tmr = otg_timer_initializer(&set_tmout, TA_WAIT_VRISE,
-				(unsigned long)&hsm->a_wait_vrise_tmout);
-	a_wait_bcon_tmr = otg_timer_initializer(&set_tmout, TA_WAIT_BCON,
-				(unsigned long)&hsm->a_wait_bcon_tmout);
-	a_aidl_bdis_tmr = otg_timer_initializer(&set_tmout, TA_AIDL_BDIS,
-				(unsigned long)&hsm->a_aidl_bdis_tmout);
-	b_ase0_brst_tmr = otg_timer_initializer(&set_tmout, TB_ASE0_BRST,
-				(unsigned long)&hsm->b_ase0_brst_tmout);
-	b_se0_srp_tmr = otg_timer_initializer(&set_tmout, TB_SE0_SRP,
-				(unsigned long)&hsm->b_se0_srp);
-	b_srp_res_tmr = otg_timer_initializer(&set_tmout, TB_SRP_RES,
-				(unsigned long)&hsm->b_srp_res_tmout);
-	b_bus_suspend_tmr = otg_timer_initializer(&set_tmout, TB_BUS_SUSPEND,
-				(unsigned long)&hsm->b_bus_suspend_tmout);
-}
-
-/* Free timers */
-static void langwell_otg_free_timers(void)
-{
-	kfree(a_wait_vrise_tmr);
-	kfree(a_wait_bcon_tmr);
-	kfree(a_aidl_bdis_tmr);
-	kfree(b_ase0_brst_tmr);
-	kfree(b_se0_srp_tmr);
-	kfree(b_srp_res_tmr);
-	kfree(b_bus_suspend_tmr);
-}
-
-/* Add timer to timer list */
-static void langwell_otg_add_timer(void *gtimer)
-{
-	struct langwell_otg_timer *timer = (struct langwell_otg_timer *)gtimer;
-	struct langwell_otg_timer *tmp_timer;
-	u32	val32;
-
-	/* Check if the timer is already in the active list,
-	 * if so update timer count
-	 */
-	list_for_each_entry(tmp_timer, &active_timers, list)
-		if (tmp_timer == timer) {
-			timer->count = timer->expires;
-			return;
-		}
-	timer->count = timer->expires;
-
-	if (list_empty(&active_timers)) {
-		val32 = readl(the_transceiver->regs + CI_OTGSC);
-		writel(val32 | OTGSC_1MSE, the_transceiver->regs + CI_OTGSC);
-	}
-
-	list_add_tail(&timer->list, &active_timers);
-}
-
-/* Remove timer from the timer list; clear timeout status */
-static void langwell_otg_del_timer(void *gtimer)
-{
-	struct langwell_otg_timer *timer = (struct langwell_otg_timer *)gtimer;
-	struct langwell_otg_timer *tmp_timer, *del_tmp;
-	u32 val32;
-
-	list_for_each_entry_safe(tmp_timer, del_tmp, &active_timers, list)
-		if (tmp_timer == timer)
-			list_del(&timer->list);
-
-	if (list_empty(&active_timers)) {
-		val32 = readl(the_transceiver->regs + CI_OTGSC);
-		writel(val32 & ~OTGSC_1MSE, the_transceiver->regs + CI_OTGSC);
-	}
-}
-
-/* Reduce timer count by 1, and find timeout conditions.*/
-static int langwell_otg_tick_timer(u32 *int_sts)
-{
-	struct langwell_otg_timer *tmp_timer, *del_tmp;
-	int expired = 0;
-
-	list_for_each_entry_safe(tmp_timer, del_tmp, &active_timers, list) {
-		tmp_timer->count--;
-		/* check if timer expires */
-		if (!tmp_timer->count) {
-			list_del(&tmp_timer->list);
-			tmp_timer->function(tmp_timer->data);
-			expired = 1;
-		}
-	}
-
-	if (list_empty(&active_timers)) {
-		otg_dbg("tick timer: disable 1ms int\n");
-		*int_sts = *int_sts & ~OTGSC_1MSE;
-	}
-	return expired;
-}
-
-static void reset_otg(void)
-{
-	u32	val;
-	int	delay_time = 1000;
-
-	otg_dbg("reseting OTG controller ...\n");
-	val = readl(the_transceiver->regs + CI_USBCMD);
-	writel(val | USBCMD_RST, the_transceiver->regs + CI_USBCMD);
-	do {
-		udelay(100);
-		if (!delay_time--)
-			otg_dbg("reset timeout\n");
-		val = readl(the_transceiver->regs + CI_USBCMD);
-		val &= USBCMD_RST;
-	} while (val != 0);
-	otg_dbg("reset done.\n");
-}
-
-static void set_host_mode(void)
-{
-	u32 	val;
-
-	reset_otg();
-	val = readl(the_transceiver->regs + CI_USBMODE);
-	val = (val & (~USBMODE_CM)) | USBMODE_HOST;
-	writel(val, the_transceiver->regs + CI_USBMODE);
-}
-
-static void set_client_mode(void)
-{
-	u32 	val;
-
-	reset_otg();
-	val = readl(the_transceiver->regs + CI_USBMODE);
-	val = (val & (~USBMODE_CM)) | USBMODE_DEVICE;
-	writel(val, the_transceiver->regs + CI_USBMODE);
-}
-
-static void init_hsm(void)
-{
-	struct langwell_otg	*langwell = the_transceiver;
-	u32			val32;
-
-	/* read OTGSC after reset */
-	val32 = readl(langwell->regs + CI_OTGSC);
-	otg_dbg("%s: OTGSC init value = 0x%x\n", __func__, val32);
-
-	/* set init state */
-	if (val32 & OTGSC_ID) {
-		langwell->hsm.id = 1;
-		langwell->otg.default_a = 0;
-		set_client_mode();
-		langwell->otg.state = OTG_STATE_B_IDLE;
-		langwell_otg_drv_vbus(0);
-	} else {
-		langwell->hsm.id = 0;
-		langwell->otg.default_a = 1;
-		set_host_mode();
-		langwell->otg.state = OTG_STATE_A_IDLE;
-	}
-
-	/* set session indicator */
-	if (val32 & OTGSC_BSE)
-		langwell->hsm.b_sess_end = 1;
-	if (val32 & OTGSC_BSV)
-		langwell->hsm.b_sess_vld = 1;
-	if (val32 & OTGSC_ASV)
-		langwell->hsm.a_sess_vld = 1;
-	if (val32 & OTGSC_AVV)
-		langwell->hsm.a_vbus_vld = 1;
-
-	/* defautly power the bus */
-	langwell->hsm.a_bus_req = 1;
-	langwell->hsm.a_bus_drop = 0;
-	/* defautly don't request bus as B device */
-	langwell->hsm.b_bus_req = 0;
-	/* no system error */
-	langwell->hsm.a_clr_err = 0;
-}
-
-static irqreturn_t otg_dummy_irq(int irq, void *_dev)
-{
-	void __iomem	*reg_base = _dev;
-	u32	val;
-	u32	int_mask = 0;
-
-	val = readl(reg_base + CI_USBMODE);
-	if ((val & USBMODE_CM) != USBMODE_DEVICE)
-		return IRQ_NONE;
-
-	val = readl(reg_base + CI_USBSTS);
-	int_mask = val & INTR_DUMMY_MASK;
-
-	if (int_mask == 0)
-		return IRQ_NONE;
-
-	/* clear hsm.b_conn here since host driver can't detect it
-	*  otg_dummy_irq called means B-disconnect happened.
-	*/
-	if (the_transceiver->hsm.b_conn) {
-		the_transceiver->hsm.b_conn = 0;
-		if (spin_trylock(&the_transceiver->wq_lock)) {
-			queue_work(the_transceiver->qwork,
-				&the_transceiver->work);
-			spin_unlock(&the_transceiver->wq_lock);
-		}
-	}
-	/* Clear interrupts */
-	writel(int_mask, reg_base + CI_USBSTS);
-	return IRQ_HANDLED;
-}
-
-static irqreturn_t otg_irq(int irq, void *_dev)
-{
-	struct	langwell_otg *langwell = _dev;
-	u32	int_sts, int_en;
-	u32	int_mask = 0;
-	int	flag = 0;
-
-	int_sts = readl(langwell->regs + CI_OTGSC);
-	int_en = (int_sts & OTGSC_INTEN_MASK) >> 8;
-	int_mask = int_sts & int_en;
-	if (int_mask == 0)
-		return IRQ_NONE;
-
-	if (int_mask & OTGSC_IDIS) {
-		otg_dbg("%s: id change int\n", __func__);
-		langwell->hsm.id = (int_sts & OTGSC_ID) ? 1 : 0;
-		flag = 1;
-	}
-	if (int_mask & OTGSC_DPIS) {
-		otg_dbg("%s: data pulse int\n", __func__);
-		langwell->hsm.a_srp_det = (int_sts & OTGSC_DPS) ? 1 : 0;
-		flag = 1;
-	}
-	if (int_mask & OTGSC_BSEIS) {
-		otg_dbg("%s: b session end int\n", __func__);
-		langwell->hsm.b_sess_end = (int_sts & OTGSC_BSE) ? 1 : 0;
-		flag = 1;
-	}
-	if (int_mask & OTGSC_BSVIS) {
-		otg_dbg("%s: b session valid int\n", __func__);
-		langwell->hsm.b_sess_vld = (int_sts & OTGSC_BSV) ? 1 : 0;
-		flag = 1;
-	}
-	if (int_mask & OTGSC_ASVIS) {
-		otg_dbg("%s: a session valid int\n", __func__);
-		langwell->hsm.a_sess_vld = (int_sts & OTGSC_ASV) ? 1 : 0;
-		flag = 1;
-	}
-	if (int_mask & OTGSC_AVVIS) {
-		otg_dbg("%s: a vbus valid int\n", __func__);
-		langwell->hsm.a_vbus_vld = (int_sts & OTGSC_AVV) ? 1 : 0;
-		flag = 1;
-	}
-
-	if (int_mask & OTGSC_1MSS) {
-		/* need to schedule otg_work if any timer is expired */
-		if (langwell_otg_tick_timer(&int_sts))
-			flag = 1;
-	}
-
-	writel((int_sts & ~OTGSC_INTSTS_MASK) | int_mask,
-			langwell->regs + CI_OTGSC);
-	if (flag)
-		queue_work(langwell->qwork, &langwell->work);
-
-	return IRQ_HANDLED;
-}
-
-static void langwell_otg_work(struct work_struct *work)
-{
-	struct langwell_otg *langwell = container_of(work,
-					struct langwell_otg, work);
-	int	retval;
-
-	otg_dbg("%s: old state = %s\n", __func__,
-			state_string(langwell->otg.state));
-
-	switch (langwell->otg.state) {
-	case OTG_STATE_UNDEFINED:
-	case OTG_STATE_B_IDLE:
-		if (!langwell->hsm.id) {
-			langwell_otg_del_timer(b_srp_res_tmr);
-			langwell->otg.default_a = 1;
-			langwell->hsm.a_srp_det = 0;
-
-			langwell_otg_chrg_vbus(0);
-			langwell_otg_drv_vbus(0);
-
-			set_host_mode();
-			langwell->otg.state = OTG_STATE_A_IDLE;
-			queue_work(langwell->qwork, &langwell->work);
-		} else if (langwell->hsm.b_srp_res_tmout) {
-			langwell->hsm.b_srp_res_tmout = 0;
-			langwell->hsm.b_bus_req = 0;
-			langwell_otg_nsf_msg(6);
-		} else if (langwell->hsm.b_sess_vld) {
-			langwell_otg_del_timer(b_srp_res_tmr);
-			langwell->hsm.b_sess_end = 0;
-			langwell->hsm.a_bus_suspend = 0;
-
-			langwell_otg_chrg_vbus(0);
-			if (langwell->client_ops) {
-				langwell->client_ops->resume(langwell->pdev);
-				langwell->otg.state = OTG_STATE_B_PERIPHERAL;
-			} else
-				otg_dbg("client driver not loaded.\n");
-
-		} else if (langwell->hsm.b_bus_req &&
-				(langwell->hsm.b_sess_end)) {
-			/* workaround for b_se0_srp detection */
-			retval = langwell_otg_check_se0_srp(0);
-			if (retval) {
-				langwell->hsm.b_bus_req = 0;
-				otg_dbg("LS is not SE0, try again later\n");
-			} else {
-				/* Start SRP */
-				langwell_otg_start_srp(&langwell->otg);
-				langwell_otg_add_timer(b_srp_res_tmr);
-			}
-		}
-		break;
-	case OTG_STATE_B_SRP_INIT:
-		if (!langwell->hsm.id) {
-			langwell->otg.default_a = 1;
-			langwell->hsm.a_srp_det = 0;
-
-			langwell_otg_drv_vbus(0);
-			langwell_otg_chrg_vbus(0);
-
-			langwell->otg.state = OTG_STATE_A_IDLE;
-			queue_work(langwell->qwork, &langwell->work);
-		} else if (langwell->hsm.b_sess_vld) {
-			langwell_otg_chrg_vbus(0);
-			if (langwell->client_ops) {
-				langwell->client_ops->resume(langwell->pdev);
-				langwell->otg.state = OTG_STATE_B_PERIPHERAL;
-			} else
-				otg_dbg("client driver not loaded.\n");
-		}
-		break;
-	case OTG_STATE_B_PERIPHERAL:
-		if (!langwell->hsm.id) {
-			langwell->otg.default_a = 1;
-			langwell->hsm.a_srp_det = 0;
-
-			langwell_otg_drv_vbus(0);
-			langwell_otg_chrg_vbus(0);
-			set_host_mode();
-
-			if (langwell->client_ops) {
-				langwell->client_ops->suspend(langwell->pdev,
-					PMSG_FREEZE);
-			} else
-				otg_dbg("client driver has been removed.\n");
-
-			langwell->otg.state = OTG_STATE_A_IDLE;
-			queue_work(langwell->qwork, &langwell->work);
-		} else if (!langwell->hsm.b_sess_vld) {
-			langwell->hsm.b_hnp_enable = 0;
-
-			if (langwell->client_ops) {
-				langwell->client_ops->suspend(langwell->pdev,
-					PMSG_FREEZE);
-			} else
-				otg_dbg("client driver has been removed.\n");
-
-			langwell->otg.state = OTG_STATE_B_IDLE;
-		} else if (langwell->hsm.b_bus_req && langwell->hsm.b_hnp_enable
-			&& langwell->hsm.a_bus_suspend) {
-
-			if (langwell->client_ops) {
-				langwell->client_ops->suspend(langwell->pdev,
-					PMSG_FREEZE);
-			} else
-				otg_dbg("client driver has been removed.\n");
-
-			langwell_otg_HAAR(1);
-			langwell->hsm.a_conn = 0;
-
-			if (langwell->host_ops) {
-				langwell->host_ops->probe(langwell->pdev,
-					langwell->host_ops->id_table);
-				langwell->otg.state = OTG_STATE_B_WAIT_ACON;
-			} else
-				otg_dbg("host driver not loaded.\n");
-
-			langwell->hsm.a_bus_resume = 0;
-			langwell->hsm.b_ase0_brst_tmout = 0;
-			langwell_otg_add_timer(b_ase0_brst_tmr);
-		}
-		break;
-
-	case OTG_STATE_B_WAIT_ACON:
-		if (!langwell->hsm.id) {
-			langwell_otg_del_timer(b_ase0_brst_tmr);
-			langwell->otg.default_a = 1;
-			langwell->hsm.a_srp_det = 0;
-
-			langwell_otg_drv_vbus(0);
-			langwell_otg_chrg_vbus(0);
-			set_host_mode();
-
-			langwell_otg_HAAR(0);
-			if (langwell->host_ops)
-				langwell->host_ops->remove(langwell->pdev);
-			else
-				otg_dbg("host driver has been removed.\n");
-			langwell->otg.state = OTG_STATE_A_IDLE;
-			queue_work(langwell->qwork, &langwell->work);
-		} else if (!langwell->hsm.b_sess_vld) {
-			langwell_otg_del_timer(b_ase0_brst_tmr);
-			langwell->hsm.b_hnp_enable = 0;
-			langwell->hsm.b_bus_req = 0;
-			langwell_otg_chrg_vbus(0);
-			langwell_otg_HAAR(0);
-
-			if (langwell->host_ops)
-				langwell->host_ops->remove(langwell->pdev);
-			else
-				otg_dbg("host driver has been removed.\n");
-			langwell->otg.state = OTG_STATE_B_IDLE;
-		} else if (langwell->hsm.a_conn) {
-			langwell_otg_del_timer(b_ase0_brst_tmr);
-			langwell_otg_HAAR(0);
-			langwell->otg.state = OTG_STATE_B_HOST;
-			queue_work(langwell->qwork, &langwell->work);
-		} else if (langwell->hsm.a_bus_resume ||
-				langwell->hsm.b_ase0_brst_tmout) {
-			langwell_otg_del_timer(b_ase0_brst_tmr);
-			langwell_otg_HAAR(0);
-			langwell_otg_nsf_msg(7);
-
-			if (langwell->host_ops)
-				langwell->host_ops->remove(langwell->pdev);
-			else
-				otg_dbg("host driver has been removed.\n");
-
-			langwell->hsm.a_bus_suspend = 0;
-			langwell->hsm.b_bus_req = 0;
-
-			if (langwell->client_ops)
-				langwell->client_ops->resume(langwell->pdev);
-			else
-				otg_dbg("client driver not loaded.\n");
-
-			langwell->otg.state = OTG_STATE_B_PERIPHERAL;
-		}
-		break;
-
-	case OTG_STATE_B_HOST:
-		if (!langwell->hsm.id) {
-			langwell->otg.default_a = 1;
-			langwell->hsm.a_srp_det = 0;
-
-			langwell_otg_drv_vbus(0);
-			langwell_otg_chrg_vbus(0);
-			set_host_mode();
-			if (langwell->host_ops)
-				langwell->host_ops->remove(langwell->pdev);
-			else
-				otg_dbg("host driver has been removed.\n");
-			langwell->otg.state = OTG_STATE_A_IDLE;
-			queue_work(langwell->qwork, &langwell->work);
-		} else if (!langwell->hsm.b_sess_vld) {
-			langwell->hsm.b_hnp_enable = 0;
-			langwell->hsm.b_bus_req = 0;
-			langwell_otg_chrg_vbus(0);
-			if (langwell->host_ops)
-				langwell->host_ops->remove(langwell->pdev);
-			else
-				otg_dbg("host driver has been removed.\n");
-			langwell->otg.state = OTG_STATE_B_IDLE;
-		} else if ((!langwell->hsm.b_bus_req) ||
-				(!langwell->hsm.a_conn)) {
-			langwell->hsm.b_bus_req = 0;
-			langwell_otg_loc_sof(0);
-			if (langwell->host_ops)
-				langwell->host_ops->remove(langwell->pdev);
-			else
-				otg_dbg("host driver has been removed.\n");
-
-			langwell->hsm.a_bus_suspend = 0;
-
-			if (langwell->client_ops)
-				langwell->client_ops->resume(langwell->pdev);
-			else
-				otg_dbg("client driver not loaded.\n");
-
-			langwell->otg.state = OTG_STATE_B_PERIPHERAL;
-		}
-		break;
-
-	case OTG_STATE_A_IDLE:
-		langwell->otg.default_a = 1;
-		if (langwell->hsm.id) {
-			langwell->otg.default_a = 0;
-			langwell->hsm.b_bus_req = 0;
-			langwell_otg_drv_vbus(0);
-			langwell_otg_chrg_vbus(0);
-
-			langwell->otg.state = OTG_STATE_B_IDLE;
-			queue_work(langwell->qwork, &langwell->work);
-		} else if (langwell->hsm.a_sess_vld) {
-			langwell_otg_drv_vbus(1);
-			langwell->hsm.a_srp_det = 1;
-			langwell->hsm.a_wait_vrise_tmout = 0;
-			langwell_otg_add_timer(a_wait_vrise_tmr);
-			langwell->otg.state = OTG_STATE_A_WAIT_VRISE;
-			queue_work(langwell->qwork, &langwell->work);
-		} else if (!langwell->hsm.a_bus_drop &&
-			(langwell->hsm.a_srp_det || langwell->hsm.a_bus_req)) {
-			langwell_otg_drv_vbus(1);
-			langwell->hsm.a_wait_vrise_tmout = 0;
-			langwell_otg_add_timer(a_wait_vrise_tmr);
-			langwell->otg.state = OTG_STATE_A_WAIT_VRISE;
-			queue_work(langwell->qwork, &langwell->work);
-		}
-		break;
-	case OTG_STATE_A_WAIT_VRISE:
-		if (langwell->hsm.id) {
-			langwell_otg_del_timer(a_wait_vrise_tmr);
-			langwell->hsm.b_bus_req = 0;
-			langwell->otg.default_a = 0;
-			langwell_otg_drv_vbus(0);
-			langwell->otg.state = OTG_STATE_B_IDLE;
-		} else if (langwell->hsm.a_vbus_vld) {
-			langwell_otg_del_timer(a_wait_vrise_tmr);
-			if (langwell->host_ops)
-				langwell->host_ops->probe(langwell->pdev,
-						langwell->host_ops->id_table);
-			else
-				otg_dbg("host driver not loaded.\n");
-			langwell->hsm.b_conn = 0;
-			langwell->hsm.a_set_b_hnp_en = 0;
-			langwell->hsm.a_wait_bcon_tmout = 0;
-			langwell_otg_add_timer(a_wait_bcon_tmr);
-			langwell->otg.state = OTG_STATE_A_WAIT_BCON;
-		} else if (langwell->hsm.a_wait_vrise_tmout) {
-			if (langwell->hsm.a_vbus_vld) {
-				if (langwell->host_ops)
-					langwell->host_ops->probe(
-						langwell->pdev,
-						langwell->host_ops->id_table);
-				else
-					otg_dbg("host driver not loaded.\n");
-				langwell->hsm.b_conn = 0;
-				langwell->hsm.a_set_b_hnp_en = 0;
-				langwell->hsm.a_wait_bcon_tmout = 0;
-				langwell_otg_add_timer(a_wait_bcon_tmr);
-				langwell->otg.state = OTG_STATE_A_WAIT_BCON;
-			} else {
-				langwell_otg_drv_vbus(0);
-				langwell->otg.state = OTG_STATE_A_VBUS_ERR;
-			}
-		}
-		break;
-	case OTG_STATE_A_WAIT_BCON:
-		if (langwell->hsm.id) {
-			langwell_otg_del_timer(a_wait_bcon_tmr);
-
-			langwell->otg.default_a = 0;
-			langwell->hsm.b_bus_req = 0;
-			if (langwell->host_ops)
-				langwell->host_ops->remove(langwell->pdev);
-			else
-				otg_dbg("host driver has been removed.\n");
-			langwell_otg_drv_vbus(0);
-			langwell->otg.state = OTG_STATE_B_IDLE;
-			queue_work(langwell->qwork, &langwell->work);
-		} else if (!langwell->hsm.a_vbus_vld) {
-			langwell_otg_del_timer(a_wait_bcon_tmr);
-
-			if (langwell->host_ops)
-				langwell->host_ops->remove(langwell->pdev);
-			else
-				otg_dbg("host driver has been removed.\n");
-			langwell_otg_drv_vbus(0);
-			langwell->otg.state = OTG_STATE_A_VBUS_ERR;
-		} else if (langwell->hsm.a_bus_drop ||
-				(langwell->hsm.a_wait_bcon_tmout &&
-				!langwell->hsm.a_bus_req)) {
-			langwell_otg_del_timer(a_wait_bcon_tmr);
-
-			if (langwell->host_ops)
-				langwell->host_ops->remove(langwell->pdev);
-			else
-				otg_dbg("host driver has been removed.\n");
-			langwell_otg_drv_vbus(0);
-			langwell->otg.state = OTG_STATE_A_WAIT_VFALL;
-		} else if (langwell->hsm.b_conn) {
-			langwell_otg_del_timer(a_wait_bcon_tmr);
-
-			langwell->hsm.a_suspend_req = 0;
-			langwell->otg.state = OTG_STATE_A_HOST;
-			if (!langwell->hsm.a_bus_req &&
-				langwell->hsm.a_set_b_hnp_en) {
-				/* It is not safe enough to do a fast
-				 * transistion from A_WAIT_BCON to
-				 * A_SUSPEND */
-				msleep(10000);
-				if (langwell->hsm.a_bus_req)
-					break;
-
-				if (request_irq(langwell->pdev->irq,
-					otg_dummy_irq, IRQF_SHARED,
-					driver_name, langwell->regs) != 0) {
-					otg_dbg("request interrupt %d fail\n",
-					langwell->pdev->irq);
-				}
-
-				langwell_otg_HABA(1);
-				langwell->hsm.b_bus_resume = 0;
-				langwell->hsm.a_aidl_bdis_tmout = 0;
-				langwell_otg_add_timer(a_aidl_bdis_tmr);
-
-				langwell_otg_loc_sof(0);
-				langwell->otg.state = OTG_STATE_A_SUSPEND;
-			} else if (!langwell->hsm.a_bus_req &&
-				!langwell->hsm.a_set_b_hnp_en) {
-				struct pci_dev *pdev = langwell->pdev;
-				if (langwell->host_ops)
-					langwell->host_ops->remove(pdev);
-				else
-					otg_dbg("host driver removed.\n");
-				langwell_otg_drv_vbus(0);
-				langwell->otg.state = OTG_STATE_A_WAIT_VFALL;
-			}
-		}
-		break;
-	case OTG_STATE_A_HOST:
-		if (langwell->hsm.id) {
-			langwell->otg.default_a = 0;
-			langwell->hsm.b_bus_req = 0;
-			if (langwell->host_ops)
-				langwell->host_ops->remove(langwell->pdev);
-			else
-				otg_dbg("host driver has been removed.\n");
-			langwell_otg_drv_vbus(0);
-			langwell->otg.state = OTG_STATE_B_IDLE;
-			queue_work(langwell->qwork, &langwell->work);
-		} else if (langwell->hsm.a_bus_drop ||
-		(!langwell->hsm.a_set_b_hnp_en && !langwell->hsm.a_bus_req)) {
-			if (langwell->host_ops)
-				langwell->host_ops->remove(langwell->pdev);
-			else
-				otg_dbg("host driver has been removed.\n");
-			langwell_otg_drv_vbus(0);
-			langwell->otg.state = OTG_STATE_A_WAIT_VFALL;
-		} else if (!langwell->hsm.a_vbus_vld) {
-			if (langwell->host_ops)
-				langwell->host_ops->remove(langwell->pdev);
-			else
-				otg_dbg("host driver has been removed.\n");
-			langwell_otg_drv_vbus(0);
-			langwell->otg.state = OTG_STATE_A_VBUS_ERR;
-		} else if (langwell->hsm.a_set_b_hnp_en
-				&& !langwell->hsm.a_bus_req) {
-			/* Set HABA to enable hardware assistance to signal
-			 *  A-connect after receiver B-disconnect. Hardware
-			 *  will then set client mode and enable URE, SLE and
-			 *  PCE after the assistance. otg_dummy_irq is used to
-			 *  clean these ints when client driver is not resumed.
-			 */
-			if (request_irq(langwell->pdev->irq,
-				otg_dummy_irq, IRQF_SHARED, driver_name,
-				langwell->regs) != 0) {
-				otg_dbg("request interrupt %d failed\n",
-						langwell->pdev->irq);
-			}
-
-			/* set HABA */
-			langwell_otg_HABA(1);
-			langwell->hsm.b_bus_resume = 0;
-			langwell->hsm.a_aidl_bdis_tmout = 0;
-			langwell_otg_add_timer(a_aidl_bdis_tmr);
-			langwell_otg_loc_sof(0);
-			langwell->otg.state = OTG_STATE_A_SUSPEND;
-		} else if (!langwell->hsm.b_conn || !langwell->hsm.a_bus_req) {
-			langwell->hsm.a_wait_bcon_tmout = 0;
-			langwell->hsm.a_set_b_hnp_en = 0;
-			langwell_otg_add_timer(a_wait_bcon_tmr);
-			langwell->otg.state = OTG_STATE_A_WAIT_BCON;
-		}
-		break;
-	case OTG_STATE_A_SUSPEND:
-		if (langwell->hsm.id) {
-			langwell_otg_del_timer(a_aidl_bdis_tmr);
-			langwell_otg_HABA(0);
-			free_irq(langwell->pdev->irq, langwell->regs);
-			langwell->otg.default_a = 0;
-			langwell->hsm.b_bus_req = 0;
-			if (langwell->host_ops)
-				langwell->host_ops->remove(langwell->pdev);
-			else
-				otg_dbg("host driver has been removed.\n");
-			langwell_otg_drv_vbus(0);
-			langwell->otg.state = OTG_STATE_B_IDLE;
-			queue_work(langwell->qwork, &langwell->work);
-		} else if (langwell->hsm.a_bus_req ||
-				langwell->hsm.b_bus_resume) {
-			langwell_otg_del_timer(a_aidl_bdis_tmr);
-			langwell_otg_HABA(0);
-			free_irq(langwell->pdev->irq, langwell->regs);
-			langwell->hsm.a_suspend_req = 0;
-			langwell_otg_loc_sof(1);
-			langwell->otg.state = OTG_STATE_A_HOST;
-		} else if (langwell->hsm.a_aidl_bdis_tmout ||
-				langwell->hsm.a_bus_drop) {
-			langwell_otg_del_timer(a_aidl_bdis_tmr);
-			langwell_otg_HABA(0);
-			free_irq(langwell->pdev->irq, langwell->regs);
-			if (langwell->host_ops)
-				langwell->host_ops->remove(langwell->pdev);
-			else
-				otg_dbg("host driver has been removed.\n");
-			langwell_otg_drv_vbus(0);
-			langwell->otg.state = OTG_STATE_A_WAIT_VFALL;
-		} else if (!langwell->hsm.b_conn &&
-				langwell->hsm.a_set_b_hnp_en) {
-			langwell_otg_del_timer(a_aidl_bdis_tmr);
-			langwell_otg_HABA(0);
-			free_irq(langwell->pdev->irq, langwell->regs);
-
-			if (langwell->host_ops)
-				langwell->host_ops->remove(langwell->pdev);
-			else
-				otg_dbg("host driver has been removed.\n");
-
-			langwell->hsm.b_bus_suspend = 0;
-			langwell->hsm.b_bus_suspend_vld = 0;
-			langwell->hsm.b_bus_suspend_tmout = 0;
-
-			/* msleep(200); */
-			if (langwell->client_ops)
-				langwell->client_ops->resume(langwell->pdev);
-			else
-				otg_dbg("client driver not loaded.\n");
-
-			langwell_otg_add_timer(b_bus_suspend_tmr);
-			langwell->otg.state = OTG_STATE_A_PERIPHERAL;
-			break;
-		} else if (!langwell->hsm.a_vbus_vld) {
-			langwell_otg_del_timer(a_aidl_bdis_tmr);
-			langwell_otg_HABA(0);
-			free_irq(langwell->pdev->irq, langwell->regs);
-			if (langwell->host_ops)
-				langwell->host_ops->remove(langwell->pdev);
-			else
-				otg_dbg("host driver has been removed.\n");
-			langwell_otg_drv_vbus(0);
-			langwell->otg.state = OTG_STATE_A_VBUS_ERR;
-		}
-		break;
-	case OTG_STATE_A_PERIPHERAL:
-		if (langwell->hsm.id) {
-			langwell_otg_del_timer(b_bus_suspend_tmr);
-			langwell->otg.default_a = 0;
-			langwell->hsm.b_bus_req = 0;
-			if (langwell->client_ops)
-				langwell->client_ops->suspend(langwell->pdev,
-					PMSG_FREEZE);
-			else
-				otg_dbg("client driver has been removed.\n");
-			langwell_otg_drv_vbus(0);
-			langwell->otg.state = OTG_STATE_B_IDLE;
-			queue_work(langwell->qwork, &langwell->work);
-		} else if (!langwell->hsm.a_vbus_vld) {
-			langwell_otg_del_timer(b_bus_suspend_tmr);
-			if (langwell->client_ops)
-				langwell->client_ops->suspend(langwell->pdev,
-					PMSG_FREEZE);
-			else
-				otg_dbg("client driver has been removed.\n");
-			langwell_otg_drv_vbus(0);
-			langwell->otg.state = OTG_STATE_A_VBUS_ERR;
-		} else if (langwell->hsm.a_bus_drop) {
-			langwell_otg_del_timer(b_bus_suspend_tmr);
-			if (langwell->client_ops)
-				langwell->client_ops->suspend(langwell->pdev,
-					PMSG_FREEZE);
-			else
-				otg_dbg("client driver has been removed.\n");
-			langwell_otg_drv_vbus(0);
-			langwell->otg.state = OTG_STATE_A_WAIT_VFALL;
-		} else if (langwell->hsm.b_bus_suspend) {
-			langwell_otg_del_timer(b_bus_suspend_tmr);
-			if (langwell->client_ops)
-				langwell->client_ops->suspend(langwell->pdev,
-					PMSG_FREEZE);
-			else
-				otg_dbg("client driver has been removed.\n");
-
-			if (langwell->host_ops)
-				langwell->host_ops->probe(langwell->pdev,
-						langwell->host_ops->id_table);
-			else
-				otg_dbg("host driver not loaded.\n");
-			langwell->hsm.a_set_b_hnp_en = 0;
-			langwell->hsm.a_wait_bcon_tmout = 0;
-			langwell_otg_add_timer(a_wait_bcon_tmr);
-			langwell->otg.state = OTG_STATE_A_WAIT_BCON;
-		} else if (langwell->hsm.b_bus_suspend_tmout) {
-			u32	val;
-			val = readl(langwell->regs + CI_PORTSC1);
-			if (!(val & PORTSC_SUSP))
-				break;
-			if (langwell->client_ops)
-				langwell->client_ops->suspend(langwell->pdev,
-						PMSG_FREEZE);
-			else
-				otg_dbg("client driver has been removed.\n");
-			if (langwell->host_ops)
-				langwell->host_ops->probe(langwell->pdev,
-						langwell->host_ops->id_table);
-			else
-				otg_dbg("host driver not loaded.\n");
-			langwell->hsm.a_set_b_hnp_en = 0;
-			langwell->hsm.a_wait_bcon_tmout = 0;
-			langwell_otg_add_timer(a_wait_bcon_tmr);
-			langwell->otg.state = OTG_STATE_A_WAIT_BCON;
-		}
-		break;
-	case OTG_STATE_A_VBUS_ERR:
-		if (langwell->hsm.id) {
-			langwell->otg.default_a = 0;
-			langwell->hsm.a_clr_err = 0;
-			langwell->hsm.a_srp_det = 0;
-			langwell->otg.state = OTG_STATE_B_IDLE;
-			queue_work(langwell->qwork, &langwell->work);
-		} else if (langwell->hsm.a_clr_err) {
-			langwell->hsm.a_clr_err = 0;
-			langwell->hsm.a_srp_det = 0;
-			reset_otg();
-			init_hsm();
-			if (langwell->otg.state == OTG_STATE_A_IDLE)
-				queue_work(langwell->qwork, &langwell->work);
-		}
-		break;
-	case OTG_STATE_A_WAIT_VFALL:
-		if (langwell->hsm.id) {
-			langwell->otg.default_a = 0;
-			langwell->otg.state = OTG_STATE_B_IDLE;
-			queue_work(langwell->qwork, &langwell->work);
-		} else if (langwell->hsm.a_bus_req) {
-			langwell_otg_drv_vbus(1);
-			langwell->hsm.a_wait_vrise_tmout = 0;
-			langwell_otg_add_timer(a_wait_vrise_tmr);
-			langwell->otg.state = OTG_STATE_A_WAIT_VRISE;
-		} else if (!langwell->hsm.a_sess_vld) {
-			langwell->hsm.a_srp_det = 0;
-			langwell_otg_drv_vbus(0);
-			set_host_mode();
-			langwell->otg.state = OTG_STATE_A_IDLE;
-		}
-		break;
-	default:
-		;
-	}
-
-	otg_dbg("%s: new state = %s\n", __func__,
-			state_string(langwell->otg.state));
-}
-
-	static ssize_t
-show_registers(struct device *_dev, struct device_attribute *attr, char *buf)
-{
-	struct langwell_otg *langwell;
-	char *next;
-	unsigned size;
-	unsigned t;
-
-	langwell = the_transceiver;
-	next = buf;
-	size = PAGE_SIZE;
-
-	t = scnprintf(next, size,
-		"\n"
-		"USBCMD = 0x%08x \n"
-		"USBSTS = 0x%08x \n"
-		"USBINTR = 0x%08x \n"
-		"ASYNCLISTADDR = 0x%08x \n"
-		"PORTSC1 = 0x%08x \n"
-		"HOSTPC1 = 0x%08x \n"
-		"OTGSC = 0x%08x \n"
-		"USBMODE = 0x%08x \n",
-		readl(langwell->regs + 0x30),
-		readl(langwell->regs + 0x34),
-		readl(langwell->regs + 0x38),
-		readl(langwell->regs + 0x48),
-		readl(langwell->regs + 0x74),
-		readl(langwell->regs + 0xb4),
-		readl(langwell->regs + 0xf4),
-		readl(langwell->regs + 0xf8)
-		);
-	size -= t;
-	next += t;
-
-	return PAGE_SIZE - size;
-}
-static DEVICE_ATTR(registers, S_IRUGO, show_registers, NULL);
-
-static ssize_t
-show_hsm(struct device *_dev, struct device_attribute *attr, char *buf)
-{
-	struct langwell_otg *langwell;
-	char *next;
-	unsigned size;
-	unsigned t;
-
-	langwell = the_transceiver;
-	next = buf;
-	size = PAGE_SIZE;
-
-	t = scnprintf(next, size,
-		"\n"
-		"current state = %s\n"
-		"a_bus_resume = \t%d\n"
-		"a_bus_suspend = \t%d\n"
-		"a_conn = \t%d\n"
-		"a_sess_vld = \t%d\n"
-		"a_srp_det = \t%d\n"
-		"a_vbus_vld = \t%d\n"
-		"b_bus_resume = \t%d\n"
-		"b_bus_suspend = \t%d\n"
-		"b_conn = \t%d\n"
-		"b_se0_srp = \t%d\n"
-		"b_sess_end = \t%d\n"
-		"b_sess_vld = \t%d\n"
-		"id = \t%d\n"
-		"a_set_b_hnp_en = \t%d\n"
-		"b_srp_done = \t%d\n"
-		"b_hnp_enable = \t%d\n"
-		"a_wait_vrise_tmout = \t%d\n"
-		"a_wait_bcon_tmout = \t%d\n"
-		"a_aidl_bdis_tmout = \t%d\n"
-		"b_ase0_brst_tmout = \t%d\n"
-		"a_bus_drop = \t%d\n"
-		"a_bus_req = \t%d\n"
-		"a_clr_err = \t%d\n"
-		"a_suspend_req = \t%d\n"
-		"b_bus_req = \t%d\n"
-		"b_bus_suspend_tmout = \t%d\n"
-		"b_bus_suspend_vld = \t%d\n",
-		state_string(langwell->otg.state),
-		langwell->hsm.a_bus_resume,
-		langwell->hsm.a_bus_suspend,
-		langwell->hsm.a_conn,
-		langwell->hsm.a_sess_vld,
-		langwell->hsm.a_srp_det,
-		langwell->hsm.a_vbus_vld,
-		langwell->hsm.b_bus_resume,
-		langwell->hsm.b_bus_suspend,
-		langwell->hsm.b_conn,
-		langwell->hsm.b_se0_srp,
-		langwell->hsm.b_sess_end,
-		langwell->hsm.b_sess_vld,
-		langwell->hsm.id,
-		langwell->hsm.a_set_b_hnp_en,
-		langwell->hsm.b_srp_done,
-		langwell->hsm.b_hnp_enable,
-		langwell->hsm.a_wait_vrise_tmout,
-		langwell->hsm.a_wait_bcon_tmout,
-		langwell->hsm.a_aidl_bdis_tmout,
-		langwell->hsm.b_ase0_brst_tmout,
-		langwell->hsm.a_bus_drop,
-		langwell->hsm.a_bus_req,
-		langwell->hsm.a_clr_err,
-		langwell->hsm.a_suspend_req,
-		langwell->hsm.b_bus_req,
-		langwell->hsm.b_bus_suspend_tmout,
-		langwell->hsm.b_bus_suspend_vld
-		);
-	size -= t;
-	next += t;
-
-	return PAGE_SIZE - size;
-}
-static DEVICE_ATTR(hsm, S_IRUGO, show_hsm, NULL);
-
-static ssize_t
-get_a_bus_req(struct device *dev, struct device_attribute *attr, char *buf)
-{
-	struct langwell_otg *langwell;
-	char *next;
-	unsigned size;
-	unsigned t;
-
-	langwell =  the_transceiver;
-	next = buf;
-	size = PAGE_SIZE;
-
-	t = scnprintf(next, size, "%d", langwell->hsm.a_bus_req);
-	size -= t;
-	next += t;
-
-	return PAGE_SIZE - size;
-}
-
-static ssize_t
-set_a_bus_req(struct device *dev, struct device_attribute *attr,
-		const char *buf, size_t count)
-{
-	struct langwell_otg *langwell;
-	langwell = the_transceiver;
-	if (!langwell->otg.default_a)
-		return -1;
-	if (count > 2)
-		return -1;
-
-	if (buf[0] == '0') {
-		langwell->hsm.a_bus_req = 0;
-		otg_dbg("a_bus_req = 0\n");
-	} else if (buf[0] == '1') {
-		/* If a_bus_drop is TRUE, a_bus_req can't be set */
-		if (langwell->hsm.a_bus_drop)
-			return -1;
-		langwell->hsm.a_bus_req = 1;
-		otg_dbg("a_bus_req = 1\n");
-	}
-	if (spin_trylock(&langwell->wq_lock)) {
-		queue_work(langwell->qwork, &langwell->work);
-		spin_unlock(&langwell->wq_lock);
-	}
-	return count;
-}
-static DEVICE_ATTR(a_bus_req, S_IRUGO | S_IWUGO, get_a_bus_req, set_a_bus_req);
-
-static ssize_t
-get_a_bus_drop(struct device *dev, struct device_attribute *attr, char *buf)
-{
-	struct langwell_otg *langwell;
-	char *next;
-	unsigned size;
-	unsigned t;
-
-	langwell =  the_transceiver;
-	next = buf;
-	size = PAGE_SIZE;
-
-	t = scnprintf(next, size, "%d", langwell->hsm.a_bus_drop);
-	size -= t;
-	next += t;
-
-	return PAGE_SIZE - size;
-}
-
-static ssize_t
-set_a_bus_drop(struct device *dev, struct device_attribute *attr,
-		const char *buf, size_t count)
-{
-	struct langwell_otg *langwell;
-	langwell = the_transceiver;
-	if (!langwell->otg.default_a)
-		return -1;
-	if (count > 2)
-		return -1;
-
-	if (buf[0] == '0') {
-		langwell->hsm.a_bus_drop = 0;
-		otg_dbg("a_bus_drop = 0\n");
-	} else if (buf[0] == '1') {
-		langwell->hsm.a_bus_drop = 1;
-		langwell->hsm.a_bus_req = 0;
-		otg_dbg("a_bus_drop = 1, then a_bus_req = 0\n");
-	}
-	if (spin_trylock(&langwell->wq_lock)) {
-		queue_work(langwell->qwork, &langwell->work);
-		spin_unlock(&langwell->wq_lock);
-	}
-	return count;
-}
-static DEVICE_ATTR(a_bus_drop, S_IRUGO | S_IWUGO,
-	get_a_bus_drop, set_a_bus_drop);
-
-static ssize_t
-get_b_bus_req(struct device *dev, struct device_attribute *attr, char *buf)
-{
-	struct langwell_otg *langwell;
-	char *next;
-	unsigned size;
-	unsigned t;
-
-	langwell =  the_transceiver;
-	next = buf;
-	size = PAGE_SIZE;
-
-	t = scnprintf(next, size, "%d", langwell->hsm.b_bus_req);
-	size -= t;
-	next += t;
-
-	return PAGE_SIZE - size;
-}
-
-static ssize_t
-set_b_bus_req(struct device *dev, struct device_attribute *attr,
-		const char *buf, size_t count)
-{
-	struct langwell_otg *langwell;
-	langwell = the_transceiver;
-
-	if (langwell->otg.default_a)
-		return -1;
-
-	if (count > 2)
-		return -1;
-
-	if (buf[0] == '0') {
-		langwell->hsm.b_bus_req = 0;
-		otg_dbg("b_bus_req = 0\n");
-	} else if (buf[0] == '1') {
-		langwell->hsm.b_bus_req = 1;
-		otg_dbg("b_bus_req = 1\n");
-	}
-	if (spin_trylock(&langwell->wq_lock)) {
-		queue_work(langwell->qwork, &langwell->work);
-		spin_unlock(&langwell->wq_lock);
-	}
-	return count;
-}
-static DEVICE_ATTR(b_bus_req, S_IRUGO | S_IWUGO, get_b_bus_req, set_b_bus_req);
-
-static ssize_t
-set_a_clr_err(struct device *dev, struct device_attribute *attr,
-		const char *buf, size_t count)
-{
-	struct langwell_otg *langwell;
-	langwell = the_transceiver;
-
-	if (!langwell->otg.default_a)
-		return -1;
-	if (count > 2)
-		return -1;
-
-	if (buf[0] == '1') {
-		langwell->hsm.a_clr_err = 1;
-		otg_dbg("a_clr_err = 1\n");
-	}
-	if (spin_trylock(&langwell->wq_lock)) {
-		queue_work(langwell->qwork, &langwell->work);
-		spin_unlock(&langwell->wq_lock);
-	}
-	return count;
-}
-static DEVICE_ATTR(a_clr_err, S_IWUGO, NULL, set_a_clr_err);
-
-static struct attribute *inputs_attrs[] = {
-	&dev_attr_a_bus_req.attr,
-	&dev_attr_a_bus_drop.attr,
-	&dev_attr_b_bus_req.attr,
-	&dev_attr_a_clr_err.attr,
-	NULL,
-};
-
-static struct attribute_group debug_dev_attr_group = {
-	.name = "inputs",
-	.attrs = inputs_attrs,
-};
-
-int langwell_register_host(struct pci_driver *host_driver)
-{
-	int	ret = 0;
-
-	the_transceiver->host_ops = host_driver;
-	queue_work(the_transceiver->qwork, &the_transceiver->work);
-	otg_dbg("host controller driver is registered\n");
-
-	return ret;
-}
-EXPORT_SYMBOL(langwell_register_host);
-
-void langwell_unregister_host(struct pci_driver *host_driver)
-{
-	if (the_transceiver->host_ops)
-		the_transceiver->host_ops->remove(the_transceiver->pdev);
-	the_transceiver->host_ops = NULL;
-	the_transceiver->hsm.a_bus_drop = 1;
-	queue_work(the_transceiver->qwork, &the_transceiver->work);
-	otg_dbg("host controller driver is unregistered\n");
-}
-EXPORT_SYMBOL(langwell_unregister_host);
-
-int langwell_register_peripheral(struct pci_driver *client_driver)
-{
-	int	ret = 0;
-
-	if (client_driver)
-		ret = client_driver->probe(the_transceiver->pdev,
-				client_driver->id_table);
-	if (!ret) {
-		the_transceiver->client_ops = client_driver;
-		queue_work(the_transceiver->qwork, &the_transceiver->work);
-		otg_dbg("client controller driver is registered\n");
-	}
-
-	return ret;
-}
-EXPORT_SYMBOL(langwell_register_peripheral);
-
-void langwell_unregister_peripheral(struct pci_driver *client_driver)
-{
-	if (the_transceiver->client_ops)
-		the_transceiver->client_ops->remove(the_transceiver->pdev);
-	the_transceiver->client_ops = NULL;
-	the_transceiver->hsm.b_bus_req = 0;
-	queue_work(the_transceiver->qwork, &the_transceiver->work);
-	otg_dbg("client controller driver is unregistered\n");
-}
-EXPORT_SYMBOL(langwell_unregister_peripheral);
-
-static int langwell_otg_probe(struct pci_dev *pdev,
-		const struct pci_device_id *id)
-{
-	unsigned long		resource, len;
-	void __iomem 		*base = NULL;
-	int			retval;
-	u32			val32;
-	struct langwell_otg	*langwell;
-	char			qname[] = "langwell_otg_queue";
-
-	retval = 0;
-	otg_dbg("\notg controller is detected.\n");
-	if (pci_enable_device(pdev) < 0) {
-		retval = -ENODEV;
-		goto done;
-	}
-
-	langwell = kzalloc(sizeof *langwell, GFP_KERNEL);
-	if (langwell == NULL) {
-		retval = -ENOMEM;
-		goto done;
-	}
-	the_transceiver = langwell;
-
-	/* control register: BAR 0 */
-	resource = pci_resource_start(pdev, 0);
-	len = pci_resource_len(pdev, 0);
-	if (!request_mem_region(resource, len, driver_name)) {
-		retval = -EBUSY;
-		goto err;
-	}
-	langwell->region = 1;
-
-	base = ioremap_nocache(resource, len);
-	if (base == NULL) {
-		retval = -EFAULT;
-		goto err;
-	}
-	langwell->regs = base;
-
-	if (!pdev->irq) {
-		otg_dbg("No IRQ.\n");
-		retval = -ENODEV;
-		goto err;
-	}
-
-	langwell->qwork = create_workqueue(qname);
-	if (!langwell->qwork) {
-		otg_dbg("cannot create workqueue %s\n", qname);
-		retval = -ENOMEM;
-		goto err;
-	}
-	INIT_WORK(&langwell->work, langwell_otg_work);
-
-	/* OTG common part */
-	langwell->pdev = pdev;
-	langwell->otg.dev = &pdev->dev;
-	langwell->otg.label = driver_name;
-	langwell->otg.set_host = langwell_otg_set_host;
-	langwell->otg.set_peripheral = langwell_otg_set_peripheral;
-	langwell->otg.set_power = langwell_otg_set_power;
-	langwell->otg.start_srp = langwell_otg_start_srp;
-	langwell->otg.state = OTG_STATE_UNDEFINED;
-	if (otg_set_transceiver(&langwell->otg)) {
-		otg_dbg("can't set transceiver\n");
-		retval = -EBUSY;
-		goto err;
-	}
-
-	reset_otg();
-	init_hsm();
-
-	spin_lock_init(&langwell->lock);
-	spin_lock_init(&langwell->wq_lock);
-	INIT_LIST_HEAD(&active_timers);
-	langwell_otg_init_timers(&langwell->hsm);
-
-	if (request_irq(pdev->irq, otg_irq, IRQF_SHARED,
-				driver_name, langwell) != 0) {
-		otg_dbg("request interrupt %d failed\n", pdev->irq);
-		retval = -EBUSY;
-		goto err;
-	}
-
-	/* enable OTGSC int */
-	val32 = OTGSC_DPIE | OTGSC_BSEIE | OTGSC_BSVIE |
-		OTGSC_ASVIE | OTGSC_AVVIE | OTGSC_IDIE | OTGSC_IDPU;
-	writel(val32, langwell->regs + CI_OTGSC);
-
-	retval = device_create_file(&pdev->dev, &dev_attr_registers);
-	if (retval < 0) {
-		otg_dbg("Can't register sysfs attribute: %d\n", retval);
-		goto err;
-	}
-
-	retval = device_create_file(&pdev->dev, &dev_attr_hsm);
-	if (retval < 0) {
-		otg_dbg("Can't hsm sysfs attribute: %d\n", retval);
-		goto err;
-	}
-
-	retval = sysfs_create_group(&pdev->dev.kobj, &debug_dev_attr_group);
-	if (retval < 0) {
-		otg_dbg("Can't register sysfs attr group: %d\n", retval);
-		goto err;
-	}
-
-	if (langwell->otg.state == OTG_STATE_A_IDLE)
-		queue_work(langwell->qwork, &langwell->work);
-
-	return 0;
-
-err:
-	if (the_transceiver)
-		langwell_otg_remove(pdev);
-done:
-	return retval;
-}
-
-static void langwell_otg_remove(struct pci_dev *pdev)
-{
-	struct langwell_otg *langwell;
-
-	langwell = the_transceiver;
-
-	if (langwell->qwork) {
-		flush_workqueue(langwell->qwork);
-		destroy_workqueue(langwell->qwork);
-	}
-	langwell_otg_free_timers();
-
-	/* disable OTGSC interrupt as OTGSC doesn't change in reset */
-	writel(0, langwell->regs + CI_OTGSC);
-
-	if (pdev->irq)
-		free_irq(pdev->irq, langwell);
-	if (langwell->regs)
-		iounmap(langwell->regs);
-	if (langwell->region)
-		release_mem_region(pci_resource_start(pdev, 0),
-				pci_resource_len(pdev, 0));
-
-	otg_set_transceiver(NULL);
-	pci_disable_device(pdev);
-	sysfs_remove_group(&pdev->dev.kobj, &debug_dev_attr_group);
-	device_remove_file(&pdev->dev, &dev_attr_hsm);
-	device_remove_file(&pdev->dev, &dev_attr_registers);
-	kfree(langwell);
-	langwell = NULL;
-}
-
-static void transceiver_suspend(struct pci_dev *pdev)
-{
-	pci_save_state(pdev);
-	pci_set_power_state(pdev, PCI_D3hot);
-	langwell_otg_phy_low_power(1);
-}
-
-static int langwell_otg_suspend(struct pci_dev *pdev, pm_message_t message)
-{
-	int 	ret = 0;
-	struct langwell_otg *langwell;
-
-	langwell = the_transceiver;
-
-	/* Disbale OTG interrupts */
-	langwell_otg_intr(0);
-
-	if (pdev->irq)
-		free_irq(pdev->irq, langwell);
-
-	/* Prevent more otg_work */
-	flush_workqueue(langwell->qwork);
-	spin_lock(&langwell->wq_lock);
-
-	/* start actions */
-	switch (langwell->otg.state) {
-	case OTG_STATE_A_IDLE:
-	case OTG_STATE_B_IDLE:
-	case OTG_STATE_A_WAIT_VFALL:
-	case OTG_STATE_A_VBUS_ERR:
-		transceiver_suspend(pdev);
-		break;
-	case OTG_STATE_A_WAIT_VRISE:
-		langwell_otg_del_timer(a_wait_vrise_tmr);
-		langwell->hsm.a_srp_det = 0;
-		langwell_otg_drv_vbus(0);
-		langwell->otg.state = OTG_STATE_A_IDLE;
-		transceiver_suspend(pdev);
-		break;
-	case OTG_STATE_A_WAIT_BCON:
-		langwell_otg_del_timer(a_wait_bcon_tmr);
-		if (langwell->host_ops)
-			ret = langwell->host_ops->suspend(pdev, message);
-		langwell_otg_drv_vbus(0);
-		break;
-	case OTG_STATE_A_HOST:
-		if (langwell->host_ops)
-			ret = langwell->host_ops->suspend(pdev, message);
-		langwell_otg_drv_vbus(0);
-		langwell_otg_phy_low_power(1);
-		break;
-	case OTG_STATE_A_SUSPEND:
-		langwell_otg_del_timer(a_aidl_bdis_tmr);
-		langwell_otg_HABA(0);
-		if (langwell->host_ops)
-			langwell->host_ops->remove(pdev);
-		else
-			otg_dbg("host driver has been removed.\n");
-		langwell_otg_drv_vbus(0);
-		transceiver_suspend(pdev);
-		langwell->otg.state = OTG_STATE_A_WAIT_VFALL;
-		break;
-	case OTG_STATE_A_PERIPHERAL:
-		if (langwell->client_ops)
-			ret = langwell->client_ops->suspend(pdev, message);
-		else
-			otg_dbg("client driver has been removed.\n");
-		langwell_otg_drv_vbus(0);
-		transceiver_suspend(pdev);
-		langwell->otg.state = OTG_STATE_A_WAIT_VFALL;
-		break;
-	case OTG_STATE_B_HOST:
-		if (langwell->host_ops)
-			langwell->host_ops->remove(pdev);
-		else
-			otg_dbg("host driver has been removed.\n");
-		langwell->hsm.b_bus_req = 0;
-		transceiver_suspend(pdev);
-		langwell->otg.state = OTG_STATE_B_IDLE;
-		break;
-	case OTG_STATE_B_PERIPHERAL:
-		if (langwell->client_ops)
-			ret = langwell->client_ops->suspend(pdev, message);
-		else
-			otg_dbg("client driver has been removed.\n");
-		break;
-	case OTG_STATE_B_WAIT_ACON:
-		langwell_otg_del_timer(b_ase0_brst_tmr);
-		langwell_otg_HAAR(0);
-		if (langwell->host_ops)
-			langwell->host_ops->remove(pdev);
-		else
-			otg_dbg("host driver has been removed.\n");
-		langwell->hsm.b_bus_req = 0;
-		langwell->otg.state = OTG_STATE_B_IDLE;
-		transceiver_suspend(pdev);
-		break;
-	default:
-		otg_dbg("error state before suspend\n ");
-		break;
-	}
-	spin_unlock(&langwell->wq_lock);
-
-	return ret;
-}
-
-static void transceiver_resume(struct pci_dev *pdev)
-{
-	pci_restore_state(pdev);
-	pci_set_power_state(pdev, PCI_D0);
-	langwell_otg_phy_low_power(0);
-}
-
-static int langwell_otg_resume(struct pci_dev *pdev)
-{
-	int 	ret = 0;
-	struct langwell_otg *langwell;
-
-	langwell = the_transceiver;
-
-	spin_lock(&langwell->wq_lock);
-
-	switch (langwell->otg.state) {
-	case OTG_STATE_A_IDLE:
-	case OTG_STATE_B_IDLE:
-	case OTG_STATE_A_WAIT_VFALL:
-	case OTG_STATE_A_VBUS_ERR:
-		transceiver_resume(pdev);
-		break;
-	case OTG_STATE_A_WAIT_BCON:
-		langwell_otg_add_timer(a_wait_bcon_tmr);
-		langwell_otg_drv_vbus(1);
-		if (langwell->host_ops)
-			ret = langwell->host_ops->resume(pdev);
-		break;
-	case OTG_STATE_A_HOST:
-		langwell_otg_drv_vbus(1);
-		langwell_otg_phy_low_power(0);
-		if (langwell->host_ops)
-			ret = langwell->host_ops->resume(pdev);
-		break;
-	case OTG_STATE_B_PERIPHERAL:
-		if (langwell->client_ops)
-			ret = langwell->client_ops->resume(pdev);
-		else
-			otg_dbg("client driver not loaded.\n");
-		break;
-	default:
-		otg_dbg("error state before suspend\n ");
-		break;
-	}
-
-	if (request_irq(pdev->irq, otg_irq, IRQF_SHARED,
-				driver_name, the_transceiver) != 0) {
-		otg_dbg("request interrupt %d failed\n", pdev->irq);
-		ret = -EBUSY;
-	}
-
-	/* enable OTG interrupts */
-	langwell_otg_intr(1);
-
-	spin_unlock(&langwell->wq_lock);
-
-	queue_work(langwell->qwork, &langwell->work);
-
-
-	return ret;
-}
-
-static int __init langwell_otg_init(void)
-{
-	return pci_register_driver(&otg_pci_driver);
-}
-module_init(langwell_otg_init);
-
-static void __exit langwell_otg_cleanup(void)
-{
-	pci_unregister_driver(&otg_pci_driver);
-}
-module_exit(langwell_otg_cleanup);
diff --git a/drivers/usb/otg/nop-usb-xceiv.c b/drivers/usb/otg/nop-usb-xceiv.c
index 9ed5ea56867..af456b48985 100644
--- a/drivers/usb/otg/nop-usb-xceiv.c
+++ b/drivers/usb/otg/nop-usb-xceiv.c
@@ -53,6 +53,7 @@ EXPORT_SYMBOL(usb_nop_xceiv_register);
 void usb_nop_xceiv_unregister(void)
 {
 	platform_device_unregister(pd);
+	pd = NULL;
 }
 EXPORT_SYMBOL(usb_nop_xceiv_unregister);