xref: /drivers/usb/misc/ftdi-elan.c

/*
* USB FTDI client driver for Elan Digital Systems's Uxxx adapters
*
* Copyright(C) 2006 Elan Digital Systems Limited
* http://www.elandigitalsystems.com
*
* Author and Maintainer - Tony Olech - Elan Digital Systems
* tony.olech@elandigitalsystems.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, version 2.
*
*
* This driver was written by Tony Olech(tony.olech@elandigitalsystems.com)
* based on various USB client drivers in the 2.6.15 linux kernel
* with constant reference to the 3rd Edition of Linux Device Drivers
* published by O'Reilly
*
* The U132 adapter is a USB to CardBus adapter specifically designed
* for PC cards that contain an OHCI host controller. Typical PC cards
* are the Orange Mobile 3G Option GlobeTrotter Fusion card.
*
* The U132 adapter will *NOT *work with PC cards that do not contain
* an OHCI controller. A simple way to test whether a PC card has an
* OHCI controller as an interface is to insert the PC card directly
* into a laptop(or desktop) with a CardBus slot and if "lspci" shows
* a new USB controller and "lsusb -v" shows a new OHCI Host Controller
* then there is a good chance that the U132 adapter will support the
* PC card.(you also need the specific client driver for the PC card)
*
* Please inform the Author and Maintainer about any PC cards that
* contain OHCI Host Controller and work when directly connected to
* an embedded CardBus slot but do not work when they are connected
* via an ELAN U132 adapter.
*
*/
#include <linux/kernel.h>
#include <linux/errno.h>
#include <linux/init.h>
#include <linux/list.h>
#include <linux/ioctl.h>
#include <linux/slab.h>
#include <linux/module.h>
#include <linux/kref.h>
#include <asm/uaccess.h>
#include <linux/usb.h>
#include <linux/workqueue.h>
#include <linux/platform_device.h>
MODULE_AUTHOR("Tony Olech");
MODULE_DESCRIPTION("FTDI ELAN driver");
MODULE_LICENSE("GPL");
#define INT_MODULE_PARM(n, v) static int n = v;module_param(n, int, 0444)
extern struct platform_driver u132_platform_driver;
static struct workqueue_struct *status_queue;
static struct workqueue_struct *command_queue;
static struct workqueue_struct *respond_queue;
/*
* ftdi_module_lock exists to protect access to global variables
*
*/
static struct semaphore ftdi_module_lock;
static int ftdi_instances = 0;
static struct list_head ftdi_static_list;
/*
* end of the global variables protected by ftdi_module_lock
*/
#include "usb_u132.h"
#define TD_DEVNOTRESP 5
/* Define these values to match your devices*/
#define USB_FTDI_ELAN_VENDOR_ID 0x0403
#define USB_FTDI_ELAN_PRODUCT_ID 0xd6ea
/* table of devices that work with this driver*/
static struct usb_device_id ftdi_elan_table[] = {
        {USB_DEVICE(USB_FTDI_ELAN_VENDOR_ID, USB_FTDI_ELAN_PRODUCT_ID)},
        { /* Terminating entry */ }
};

MODULE_DEVICE_TABLE(usb, ftdi_elan_table);
/* only the jtag(firmware upgrade device) interface requires
* a device file and corresponding minor number, but the
* interface is created unconditionally - I suppose it could
* be configured or not according to a module parameter.
* But since we(now) require one interface per device,
* and since it unlikely that a normal installation would
* require more than a couple of elan-ftdi devices, 8 seems
* like a reasonable limit to have here, and if someone
* really requires more than 8 devices, then they can frig the
* code and recompile
*/
#define USB_FTDI_ELAN_MINOR_BASE 192
#define COMMAND_BITS 5
#define COMMAND_SIZE (1<<COMMAND_BITS)
#define COMMAND_MASK (COMMAND_SIZE-1)
struct u132_command {
        u8 header;
        u16 length;
        u8 address;
        u8 width;
        u32 value;
        int follows;
        void *buffer;
};
#define RESPOND_BITS 5
#define RESPOND_SIZE (1<<RESPOND_BITS)
#define RESPOND_MASK (RESPOND_SIZE-1)
struct u132_respond {
        u8 header;
        u8 address;
        u32 *value;
        int *result;
        struct completion wait_completion;
};
struct u132_target {
        void *endp;
        struct urb *urb;
        int toggle_bits;
        int error_count;
        int condition_code;
        int repeat_number;
        int halted;
        int skipped;
        int actual;
        int non_null;
        int active;
        int abandoning;
        void (*callback) (void *endp, struct urb *urb, u8 *buf, int len,
                int toggle_bits, int error_count, int condition_code,
                int repeat_number, int halted, int skipped, int actual,
                int non_null);
};
/* Structure to hold all of our device specific stuff*/
struct usb_ftdi {
        struct list_head ftdi_list;
        struct semaphore u132_lock;
        int command_next;
        int command_head;
        struct u132_command command[COMMAND_SIZE];
        int respond_next;
        int respond_head;
        struct u132_respond respond[RESPOND_SIZE];
        struct u132_target target[4];
        char device_name[16];
        unsigned synchronized:1;
        unsigned enumerated:1;
        unsigned registered:1;
        unsigned initialized:1;
        unsigned card_ejected:1;
        int function;
        int sequence_num;
        int disconnected;
        int gone_away;
        int stuck_status;
        int status_queue_delay;
        struct semaphore sw_lock;
        struct usb_device *udev;
        struct usb_interface *interface;
        struct usb_class_driver *class;
        struct work_struct status_work;
        struct work_struct command_work;
        struct work_struct respond_work;
        struct u132_platform_data platform_data;
        struct resource resources[0];
        struct platform_device platform_dev;
        unsigned char *bulk_in_buffer;
        size_t bulk_in_size;
        size_t bulk_in_last;
        size_t bulk_in_left;
        __u8 bulk_in_endpointAddr;
        __u8 bulk_out_endpointAddr;
        struct kref kref;
        u32 controlreg;
        u8 response[4 + 1024];
        int expected;
        int recieved;
        int ed_found;
};
#define kref_to_usb_ftdi(d) container_of(d, struct usb_ftdi, kref)
#define platform_device_to_usb_ftdi(d) container_of(d, struct usb_ftdi, \
        platform_dev)
static struct usb_driver ftdi_elan_driver;
static void ftdi_elan_delete(struct kref *kref)
{
        struct usb_ftdi *ftdi = kref_to_usb_ftdi(kref);
        dev_warn(&ftdi->udev->dev, "FREEING ftdi=%p\n", ftdi);
        usb_put_dev(ftdi->udev);
        ftdi->disconnected += 1;
        down(&ftdi_module_lock);
        list_del_init(&ftdi->ftdi_list);
        ftdi_instances -= 1;
        up(&ftdi_module_lock);
        kfree(ftdi->bulk_in_buffer);
        ftdi->bulk_in_buffer = NULL;
}

static void ftdi_elan_put_kref(struct usb_ftdi *ftdi)
{
        kref_put(&ftdi->kref, ftdi_elan_delete);
}

static void ftdi_elan_get_kref(struct usb_ftdi *ftdi)
{
        kref_get(&ftdi->kref);
}

static void ftdi_elan_init_kref(struct usb_ftdi *ftdi)
{
        kref_init(&ftdi->kref);
}

static void ftdi_status_requeue_work(struct usb_ftdi *ftdi, unsigned int delta)
{
        if (delta > 0) {
                if (queue_delayed_work(status_queue, &ftdi->status_work, delta))
                        return;
        } else if (queue_work(status_queue, &ftdi->status_work))
                return;
        kref_put(&ftdi->kref, ftdi_elan_delete);
        return;
}

static void ftdi_status_queue_work(struct usb_ftdi *ftdi, unsigned int delta)
{
        if (delta > 0) {
                if (queue_delayed_work(status_queue, &ftdi->status_work, delta))
                        kref_get(&ftdi->kref);
        } else if (queue_work(status_queue, &ftdi->status_work))
                kref_get(&ftdi->kref);
        return;
}

static void ftdi_status_cancel_work(struct usb_ftdi *ftdi)
{
        if (cancel_delayed_work(&ftdi->status_work))
                kref_put(&ftdi->kref, ftdi_elan_delete);
}

static void ftdi_command_requeue_work(struct usb_ftdi *ftdi, unsigned int delta)
{
        if (delta > 0) {
                if (queue_delayed_work(command_queue, &ftdi->command_work,
                        delta))
                        return;
        } else if (queue_work(command_queue, &ftdi->command_work))
                return;
        kref_put(&ftdi->kref, ftdi_elan_delete);
        return;
}

static void ftdi_command_queue_work(struct usb_ftdi *ftdi, unsigned int delta)
{
        if (delta > 0) {
                if (queue_delayed_work(command_queue, &ftdi->command_work,
                        delta))
                        kref_get(&ftdi->kref);
        } else if (queue_work(command_queue, &ftdi->command_work))
                kref_get(&ftdi->kref);
        return;
}

static void ftdi_command_cancel_work(struct usb_ftdi *ftdi)
{
        if (cancel_delayed_work(&ftdi->command_work))
                kref_put(&ftdi->kref, ftdi_elan_delete);
}

static void ftdi_response_requeue_work(struct usb_ftdi *ftdi,
        unsigned int delta)
{
        if (delta > 0) {
                if (queue_delayed_work(respond_queue, &ftdi->respond_work,
                        delta))
                        return;
        } else if (queue_work(respond_queue, &ftdi->respond_work))
                return;
        kref_put(&ftdi->kref, ftdi_elan_delete);
        return;
}

static void ftdi_respond_queue_work(struct usb_ftdi *ftdi, unsigned int delta)
{
        if (delta > 0) {
                if (queue_delayed_work(respond_queue, &ftdi->respond_work,
                        delta))
                        kref_get(&ftdi->kref);
        } else if (queue_work(respond_queue, &ftdi->respond_work))
                kref_get(&ftdi->kref);
        return;
}

static void ftdi_response_cancel_work(struct usb_ftdi *ftdi)
{
        if (cancel_delayed_work(&ftdi->respond_work))
                kref_put(&ftdi->kref, ftdi_elan_delete);
}

void ftdi_elan_gone_away(struct platform_device *pdev)
{
        struct usb_ftdi *ftdi = platform_device_to_usb_ftdi(pdev);
        ftdi->gone_away += 1;
        ftdi_elan_put_kref(ftdi);
}


EXPORT_SYMBOL_GPL(ftdi_elan_gone_away);
void ftdi_release_platform_dev(struct device *dev)
{
        dev->parent = NULL;
}

static void ftdi_elan_do_callback(struct usb_ftdi *ftdi,
        struct u132_target *target, u8 *buffer, int length);
static void ftdi_elan_kick_command_queue(struct usb_ftdi *ftdi);
static void ftdi_elan_kick_respond_queue(struct usb_ftdi *ftdi);
static int ftdi_elan_setupOHCI(struct usb_ftdi *ftdi);
static int ftdi_elan_checkingPCI(struct usb_ftdi *ftdi);
static int ftdi_elan_enumeratePCI(struct usb_ftdi *ftdi);
static int ftdi_elan_synchronize(struct usb_ftdi *ftdi);
static int ftdi_elan_stuck_waiting(struct usb_ftdi *ftdi);
static int ftdi_elan_command_engine(struct usb_ftdi *ftdi);
static int ftdi_elan_respond_engine(struct usb_ftdi *ftdi);
static int ftdi_elan_hcd_init(struct usb_ftdi *ftdi)
{
        int result;
        if (ftdi->platform_dev.dev.parent)
                return -EBUSY;
        ftdi_elan_get_kref(ftdi);
        ftdi->platform_data.potpg = 100;
        ftdi->platform_data.reset = NULL;
        ftdi->platform_dev.id = ftdi->sequence_num;
        ftdi->platform_dev.resource = ftdi->resources;
        ftdi->platform_dev.num_resources = ARRAY_SIZE(ftdi->resources);
        ftdi->platform_dev.dev.platform_data = &ftdi->platform_data;
        ftdi->platform_dev.dev.parent = NULL;
        ftdi->platform_dev.dev.release = ftdi_release_platform_dev;
        ftdi->platform_dev.dev.dma_mask = NULL;
        snprintf(ftdi->device_name, sizeof(ftdi->device_name), "u132_hcd");
        ftdi->platform_dev.name = ftdi->device_name;
        dev_info(&ftdi->udev->dev, "requesting module '%s'\n", "u132_hcd");
        request_module("u132_hcd");
        dev_info(&ftdi->udev->dev, "registering '%s'\n",
                ftdi->platform_dev.name);
        result = platform_device_register(&ftdi->platform_dev);
        return result;
}

static void ftdi_elan_abandon_completions(struct usb_ftdi *ftdi)
{
        down(&ftdi->u132_lock);
        while (ftdi->respond_next > ftdi->respond_head) {
                struct u132_respond *respond = &ftdi->respond[RESPOND_MASK &
                        ftdi->respond_head++];
                *respond->result = -ESHUTDOWN;
                *respond->value = 0;
                complete(&respond->wait_completion);
        } up(&ftdi->u132_lock);
}

static void ftdi_elan_abandon_targets(struct usb_ftdi *ftdi)
{
        int ed_number = 4;
        down(&ftdi->u132_lock);
        while (ed_number-- > 0) {
                struct u132_target *target = &ftdi->target[ed_number];
                if (target->active == 1) {
                        target->condition_code = TD_DEVNOTRESP;
                        up(&ftdi->u132_lock);
                        ftdi_elan_do_callback(ftdi, target, NULL, 0);
                        down(&ftdi->u132_lock);
                }
        }
        ftdi->recieved = 0;
        ftdi->expected = 4;
        ftdi->ed_found = 0;
        up(&ftdi->u132_lock);
}

static void ftdi_elan_flush_targets(struct usb_ftdi *ftdi)
{
        int ed_number = 4;
        down(&ftdi->u132_lock);
        while (ed_number-- > 0) {
                struct u132_target *target = &ftdi->target[ed_number];
                target->abandoning = 1;
              wait_1:if (target->active == 1) {
                        int command_size = ftdi->command_next -
                                ftdi->command_head;
                        if (command_size < COMMAND_SIZE) {
                                struct u132_command *command = &ftdi->command[
                                        COMMAND_MASK & ftdi->command_next];
                                command->header = 0x80 | (ed_number << 5) | 0x4;
                                command->length = 0x00;
                                command->address = 0x00;
                                command->width = 0x00;
                                command->follows = 0;
                                command->value = 0;
                                command->buffer = &command->value;
                                ftdi->command_next += 1;
                                ftdi_elan_kick_command_queue(ftdi);
                        } else {
                                up(&ftdi->u132_lock);
                                msleep(100);
                                down(&ftdi->u132_lock);
                                goto wait_1;
                        }
                }
              wait_2:if (target->active == 1) {
                        int command_size = ftdi->command_next -
                                ftdi->command_head;
                        if (command_size < COMMAND_SIZE) {
                                struct u132_command *command = &ftdi->command[
                                        COMMAND_MASK & ftdi->command_next];
                                command->header = 0x90 | (ed_number << 5);
                                command->length = 0x00;
                                command->address = 0x00;
                                command->width = 0x00;
                                command->follows = 0;
                                command->value = 0;
                                command->buffer = &command->value;
                                ftdi->command_next += 1;
                                ftdi_elan_kick_command_queue(ftdi);
                        } else {
                                up(&ftdi->u132_lock);
                                msleep(100);
                                down(&ftdi->u132_lock);
                                goto wait_2;
                        }
                }
        }
        ftdi->recieved = 0;
        ftdi->expected = 4;
        ftdi->ed_found = 0;
        up(&ftdi->u132_lock);
}

static void ftdi_elan_cancel_targets(struct usb_ftdi *ftdi)
{
        int ed_number = 4;
        down(&ftdi->u132_lock);
        while (ed_number-- > 0) {
                struct u132_target *target = &ftdi->target[ed_number];
                target->abandoning = 1;
              wait:if (target->active == 1) {
                        int command_size = ftdi->command_next -
                                ftdi->command_head;
                        if (command_size < COMMAND_SIZE) {
                                struct u132_command *command = &ftdi->command[
                                        COMMAND_MASK & ftdi->command_next];
                                command->header = 0x80 | (ed_number << 5) | 0x4;
                                command->length = 0x00;
                                command->address = 0x00;
                                command->width = 0x00;
                                command->follows = 0;
                                command->value = 0;
                                command->buffer = &command->value;
                                ftdi->command_next += 1;
                                ftdi_elan_kick_command_queue(ftdi);
                        } else {
                                up(&ftdi->u132_lock);
                                msleep(100);
                                down(&ftdi->u132_lock);
                                goto wait;
                        }
                }
        }
        ftdi->recieved = 0;
        ftdi->expected = 4;
        ftdi->ed_found = 0;
        up(&ftdi->u132_lock);
}

static void ftdi_elan_kick_command_queue(struct usb_ftdi *ftdi)
{
        ftdi_command_queue_work(ftdi, 0);
        return;
}

static void ftdi_elan_command_work(void *data)
{
        struct usb_ftdi *ftdi = data;
        if (ftdi->disconnected > 0) {
                ftdi_elan_put_kref(ftdi);
                return;
        } else {
                int retval = ftdi_elan_command_engine(ftdi);
                if (retval == -ESHUTDOWN) {
                        ftdi->disconnected += 1;
                } else if (retval == -ENODEV) {
                        ftdi->disconnected += 1;
                } else if (retval)
                        dev_err(&ftdi->udev->dev, "command error %d\n", retval);
                ftdi_command_requeue_work(ftdi, msecs_to_jiffies(10));
                return;
        }
}

static void ftdi_elan_kick_respond_queue(struct usb_ftdi *ftdi)
{
        ftdi_respond_queue_work(ftdi, 0);
        return;
}

static void ftdi_elan_respond_work(void *data)
{
        struct usb_ftdi *ftdi = data;
        if (ftdi->disconnected > 0) {
                ftdi_elan_put_kref(ftdi);
                return;
        } else {
                int retval = ftdi_elan_respond_engine(ftdi);
                if (retval == 0) {
                } else if (retval == -ESHUTDOWN) {
                        ftdi->disconnected += 1;
                } else if (retval == -ENODEV) {
                        ftdi->disconnected += 1;
                } else if (retval == -EILSEQ) {
                        ftdi->disconnected += 1;
                } else {
                        ftdi->disconnected += 1;
                        dev_err(&ftdi->udev->dev, "respond error %d\n", retval);
                }
                if (ftdi->disconnected > 0) {
                        ftdi_elan_abandon_completions(ftdi);
                        ftdi_elan_abandon_targets(ftdi);
                }
                ftdi_response_requeue_work(ftdi, msecs_to_jiffies(10));
                return;
        }
}


/*
* the sw_lock is initially held and will be freed
* after the FTDI has been synchronized
*
*/
static void ftdi_elan_status_work(void *data)
{
        struct usb_ftdi *ftdi = data;
        int work_delay_in_msec = 0;
        if (ftdi->disconnected > 0) {
                ftdi_elan_put_kref(ftdi);
                return;
        } else if (ftdi->synchronized == 0) {
                down(&ftdi->sw_lock);
                if (ftdi_elan_synchronize(ftdi) == 0) {
                        ftdi->synchronized = 1;
                        ftdi_command_queue_work(ftdi, 1);
                        ftdi_respond_queue_work(ftdi, 1);
                        up(&ftdi->sw_lock);
                        work_delay_in_msec = 100;
                } else {
                        dev_err(&ftdi->udev->dev, "synchronize failed\n");
                        up(&ftdi->sw_lock);
                        work_delay_in_msec = 10 *1000;
                }
        } else if (ftdi->stuck_status > 0) {
                if (ftdi_elan_stuck_waiting(ftdi) == 0) {
                        ftdi->stuck_status = 0;
                        ftdi->synchronized = 0;
                } else if ((ftdi->stuck_status++ % 60) == 1) {
                        dev_err(&ftdi->udev->dev, "WRONG type of card inserted "
                                "- please remove\n");
                } else
                        dev_err(&ftdi->udev->dev, "WRONG type of card inserted "
                                "- checked %d times\n", ftdi->stuck_status);
                work_delay_in_msec = 100;
        } else if (ftdi->enumerated == 0) {
                if (ftdi_elan_enumeratePCI(ftdi) == 0) {
                        ftdi->enumerated = 1;
                        work_delay_in_msec = 250;
                } else
                        work_delay_in_msec = 1000;
        } else if (ftdi->initialized == 0) {
                if (ftdi_elan_setupOHCI(ftdi) == 0) {
                        ftdi->initialized = 1;
                        work_delay_in_msec = 500;
                } else {
                        dev_err(&ftdi->udev->dev, "initialized failed - trying "
                                "again in 10 seconds\n");
                        work_delay_in_msec = 10 *1000;
                }
        } else if (ftdi->registered == 0) {
                work_delay_in_msec = 10;
                if (ftdi_elan_hcd_init(ftdi) == 0) {
                        ftdi->registered = 1;
                } else
                        dev_err(&ftdi->udev->dev, "register failed\n");
                work_delay_in_msec = 250;
        } else {
                if (ftdi_elan_checkingPCI(ftdi) == 0) {
                        work_delay_in_msec = 250;
                } else if (ftdi->controlreg & 0x00400000) {
                        if (ftdi->gone_away > 0) {
                                dev_err(&ftdi->udev->dev, "PCI device eject con"
                                        "firmed platform_dev.dev.parent=%p plat"
                                        "form_dev.dev=%p\n",
                                        ftdi->platform_dev.dev.parent,
                                        &ftdi->platform_dev.dev);
                                platform_device_unregister(&ftdi->platform_dev);
                                ftdi->platform_dev.dev.parent = NULL;
                                ftdi->registered = 0;
                                ftdi->enumerated = 0;
                                ftdi->card_ejected = 0;
                                ftdi->initialized = 0;
                                ftdi->gone_away = 0;
                        } else
                                ftdi_elan_flush_targets(ftdi);
                        work_delay_in_msec = 250;
                } else {
                        dev_err(&ftdi->udev->dev, "PCI device has disappeared\n"
                                );
                        ftdi_elan_cancel_targets(ftdi);
                        work_delay_in_msec = 500;
                        ftdi->enumerated = 0;
                        ftdi->initialized = 0;
                }
        }
        if (ftdi->disconnected > 0) {
                ftdi_elan_put_kref(ftdi);
                return;
        } else {
                ftdi_status_requeue_work(ftdi,
                        msecs_to_jiffies(work_delay_in_msec));
                return;
        }
}


/*
* file_operations for the jtag interface
*
* the usage count for the device is incremented on open()
* and decremented on release()
*/
static int ftdi_elan_open(struct inode *inode, struct file *file)
{
        int subminor = iminor(inode);
        struct usb_interface *interface = usb_find_interface(&ftdi_elan_driver,
                subminor);
        if (!interface) {
                printk(KERN_ERR "can't find device for minor %d\n", subminor);
                return -ENODEV;
        } else {
                struct usb_ftdi *ftdi = usb_get_intfdata(interface);
                if (!ftdi) {
                        return -ENODEV;
                } else {
                        if (down_interruptible(&ftdi->sw_lock)) {
                                return -EINTR;
                        } else {
                                ftdi_elan_get_kref(ftdi);
                                file->private_data = ftdi;
                                return 0;
                        }
                }
        }
}

static int ftdi_elan_release(struct inode *inode, struct file *file)
{
        struct usb_ftdi *ftdi = (struct usb_ftdi *)file->private_data;
        if (ftdi == NULL)
                return -ENODEV;
        up(&ftdi->sw_lock);        /* decrement the count on our device */
        ftdi_elan_put_kref(ftdi);
        return 0;
}


#define FTDI_ELAN_IOC_MAGIC 0xA1
#define FTDI_ELAN_IOCDEBUG _IOC(_IOC_WRITE, FTDI_ELAN_IOC_MAGIC, 1, 132)
static int ftdi_elan_ioctl(struct inode *inode, struct file *file,
        unsigned int cmd, unsigned long arg)
{
        switch (cmd) {
        case FTDI_ELAN_IOCDEBUG:{
                        char line[132];
                        int size = strncpy_from_user(line,
                                (const char __user *)arg, sizeof(line));
                        if (size < 0) {
                                return -EINVAL;
                        } else {
                                printk(KERN_ERR "TODO: ioctl %s\n", line);
                                return 0;
                        }
                }
        default:
                return -EFAULT;
        }
}


/*
*
* blocking bulk reads are used to get data from the device
*
*/
static ssize_t ftdi_elan_read(struct file *file, char __user *buffer,
			      size_t count, loff_t *ppos)
{
        char data[30 *3 + 4];
        char *d = data;
        int m = (sizeof(data) - 1) / 3;
        int bytes_read = 0;
        int retry_on_empty = 10;
        int retry_on_timeout = 5;
        struct usb_ftdi *ftdi = (struct usb_ftdi *)file->private_data;
        if (ftdi->disconnected > 0) {
                return -ENODEV;
        }
        data[0] = 0;
      have:if (ftdi->bulk_in_left > 0) {
                if (count-- > 0) {
                        char *p = ++ftdi->bulk_in_last + ftdi->bulk_in_buffer;
                        ftdi->bulk_in_left -= 1;
                        if (bytes_read < m) {
                                d += sprintf(d, " %02X", 0x000000FF & *p);
                        } else if (bytes_read > m) {
                        } else
                                d += sprintf(d, " ..");
                        if (copy_to_user(buffer++, p, 1)) {
                                return -EFAULT;
                        } else {
                                bytes_read += 1;
                                goto have;
                        }
                } else
                        return bytes_read;
        }
      more:if (count > 0) {
                int packet_bytes = 0;
                int retval = usb_bulk_msg(ftdi->udev,
                        usb_rcvbulkpipe(ftdi->udev, ftdi->bulk_in_endpointAddr),
                         ftdi->bulk_in_buffer, ftdi->bulk_in_size,
                        &packet_bytes, msecs_to_jiffies(50));
                if (packet_bytes > 2) {
                        ftdi->bulk_in_left = packet_bytes - 2;
                        ftdi->bulk_in_last = 1;
                        goto have;
                } else if (retval == -ETIMEDOUT) {
                        if (retry_on_timeout-- > 0) {
                                goto more;
                        } else if (bytes_read > 0) {
                                return bytes_read;
                        } else
                                return retval;
                } else if (retval == 0) {
                        if (retry_on_empty-- > 0) {
                                goto more;
                        } else
                                return bytes_read;
                } else
                        return retval;
        } else
                return bytes_read;
}

static void ftdi_elan_write_bulk_callback(struct urb *urb)
{
        struct usb_ftdi *ftdi = (struct usb_ftdi *)urb->context;
        if (urb->status && !(urb->status == -ENOENT || urb->status ==
                -ECONNRESET || urb->status == -ESHUTDOWN)) {
                dev_err(&ftdi->udev->dev, "urb=%p write bulk status received: %"
                        "d\n", urb, urb->status);
        }
        usb_buffer_free(urb->dev, urb->transfer_buffer_length,
                urb->transfer_buffer, urb->transfer_dma);
}

static int fill_buffer_with_all_queued_commands(struct usb_ftdi *ftdi,
        char *buf, int command_size, int total_size)
{
        int ed_commands = 0;
        int b = 0;
        int I = command_size;
        int i = ftdi->command_head;
        while (I-- > 0) {
                struct u132_command *command = &ftdi->command[COMMAND_MASK &
                        i++];
                int F = command->follows;
                u8 *f = command->buffer;
                if (command->header & 0x80) {
                        ed_commands |= 1 << (0x3 & (command->header >> 5));
                }
                buf[b++] = command->header;
                buf[b++] = (command->length >> 0) & 0x00FF;
                buf[b++] = (command->length >> 8) & 0x00FF;
                buf[b++] = command->address;
                buf[b++] = command->width;
                while (F-- > 0) {
                        buf[b++] = *f++;
                }
        }
        return ed_commands;
}

static int ftdi_elan_total_command_size(struct usb_ftdi *ftdi, int command_size)
{
        int total_size = 0;
        int I = command_size;
        int i = ftdi->command_head;
        while (I-- > 0) {
                struct u132_command *command = &ftdi->command[COMMAND_MASK &
                        i++];
                total_size += 5 + command->follows;
        } return total_size;
}

static int ftdi_elan_command_engine(struct usb_ftdi *ftdi)
{
        int retval;
        char *buf;
        int ed_commands;
        int total_size;
        struct urb *urb;
        int command_size = ftdi->command_next - ftdi->command_head;
        if (command_size == 0)
                return 0;
        total_size = ftdi_elan_total_command_size(ftdi, command_size);
        urb = usb_alloc_urb(0, GFP_KERNEL);
        if (!urb) {
                dev_err(&ftdi->udev->dev, "could not get a urb to write %d comm"
                        "ands totaling %d bytes to the Uxxx\n", command_size,
                        total_size);
                return -ENOMEM;
        }
        buf = usb_buffer_alloc(ftdi->udev, total_size, GFP_KERNEL,
                &urb->transfer_dma);
        if (!buf) {
                dev_err(&ftdi->udev->dev, "could not get a buffer to write %d c"
                        "ommands totaling %d bytes to the Uxxx\n", command_size,
                         total_size);
                usb_free_urb(urb);
                return -ENOMEM;
        }
        ed_commands = fill_buffer_with_all_queued_commands(ftdi, buf,
                command_size, total_size);
        usb_fill_bulk_urb(urb, ftdi->udev, usb_sndbulkpipe(ftdi->udev,
                ftdi->bulk_out_endpointAddr), buf, total_size,
                ftdi_elan_write_bulk_callback, ftdi);
        urb->transfer_flags |= URB_NO_TRANSFER_DMA_MAP;
        if (ed_commands) {
                char diag[40 *3 + 4];
                char *d = diag;
                int m = total_size;
                u8 *c = buf;
                int s = (sizeof(diag) - 1) / 3;
                diag[0] = 0;
                while (s-- > 0 && m-- > 0) {
                        if (s > 0 || m == 0) {
                                d += sprintf(d, " %02X", *c++);
                        } else
                                d += sprintf(d, " ..");
                }
        }
        retval = usb_submit_urb(urb, GFP_KERNEL);
        if (retval) {
                dev_err(&ftdi->udev->dev, "failed %d to submit urb %p to write "
                        "%d commands totaling %d bytes to the Uxxx\n", retval,
                        urb, command_size, total_size);
                usb_buffer_free(ftdi->udev, total_size, buf, urb->transfer_dma);
                usb_free_urb(urb);
                return retval;
        }
        usb_free_urb(urb);        /* release our reference to this urb,
                the USB core will eventually free it entirely */
        ftdi->command_head += command_size;
        ftdi_elan_kick_respond_queue(ftdi);
        return 0;
}

static void ftdi_elan_do_callback(struct usb_ftdi *ftdi,
        struct u132_target *target, u8 *buffer, int length)
{
        struct urb *urb = target->urb;
        int halted = target->halted;
        int skipped = target->skipped;
        int actual = target->actual;
        int non_null = target->non_null;
        int toggle_bits = target->toggle_bits;
        int error_count = target->error_count;
        int condition_code = target->condition_code;
        int repeat_number = target->repeat_number;
        void (*callback) (void *, struct urb *, u8 *, int, int, int, int, int,
                int, int, int, int) = target->callback;
        target->active -= 1;
        target->callback = NULL;
        (*callback) (target->endp, urb, buffer, length, toggle_bits,
                error_count, condition_code, repeat_number, halted, skipped,
                actual, non_null);
}

static char *have_ed_set_response(struct usb_ftdi *ftdi,
        struct u132_target *target, u16 ed_length, int ed_number, int ed_type,
        char *b)
{
        int payload = (ed_length >> 0) & 0x07FF;
        down(&ftdi->u132_lock);
        target->actual = 0;
        target->non_null = (ed_length >> 15) & 0x0001;
        target->repeat_number = (ed_length >> 11) & 0x000F;
        if (ed_type == 0x02) {
                if (payload == 0 || target->abandoning > 0) {
                        target->abandoning = 0;
                        up(&ftdi->u132_lock);
                        ftdi_elan_do_callback(ftdi, target, 4 + ftdi->response,
                                payload);
                        ftdi->recieved = 0;
                        ftdi->expected = 4;
                        ftdi->ed_found = 0;
                        return ftdi->response;
                } else {
                        ftdi->expected = 4 + payload;
                        ftdi->ed_found = 1;
                        up(&ftdi->u132_lock);
                        return b;
                }
        } else if (ed_type == 0x03) {
                if (payload == 0 || target->abandoning > 0) {
                        target->abandoning = 0;
                        up(&ftdi->u132_lock);
                        ftdi_elan_do_callback(ftdi, target, 4 + ftdi->response,
                                payload);
                        ftdi->recieved = 0;
                        ftdi->expected = 4;
                        ftdi->ed_found = 0;
                        return ftdi->response;
                } else {
                        ftdi->expected = 4 + payload;
                        ftdi->ed_found = 1;
                        up(&ftdi->u132_lock);
                        return b;
                }
        } else if (ed_type == 0x01) {
                target->abandoning = 0;
                up(&ftdi->u132_lock);
                ftdi_elan_do_callback(ftdi, target, 4 + ftdi->response,
                        payload);
                ftdi->recieved = 0;
                ftdi->expected = 4;
                ftdi->ed_found = 0;
                return ftdi->response;
        } else {
                target->abandoning = 0;
                up(&ftdi->u132_lock);
                ftdi_elan_do_callback(ftdi, target, 4 + ftdi->response,
                        payload);
                ftdi->recieved = 0;
                ftdi->expected = 4;
                ftdi->ed_found = 0;
                return ftdi->response;
        }
}

static char *have_ed_get_response(struct usb_ftdi *ftdi,
        struct u132_target *target, u16 ed_length, int ed_number, int ed_type,
        char *b)
{
        down(&ftdi->u132_lock);
        target->condition_code = TD_DEVNOTRESP;
        target->actual = (ed_length >> 0) & 0x01FF;
        target->non_null = (ed_length >> 15) & 0x0001;
        target->repeat_number = (ed_length >> 11) & 0x000F;
        up(&ftdi->u132_lock);
        if (target->active)
                ftdi_elan_do_callback(ftdi, target, NULL, 0);
        target->abandoning = 0;
        ftdi->recieved = 0;
        ftdi->expected = 4;
        ftdi->ed_found = 0;
        return ftdi->response;
}


/*
* The engine tries to empty the FTDI fifo
*
* all responses found in the fifo data are dispatched thus
* the response buffer can only ever hold a maximum sized
* response from the Uxxx.
*
*/
static int ftdi_elan_respond_engine(struct usb_ftdi *ftdi)
{
        u8 *b = ftdi->response + ftdi->recieved;
        int bytes_read = 0;
        int retry_on_empty = 1;
        int retry_on_timeout = 3;
        int empty_packets = 0;
      read:{
                int packet_bytes = 0;
                int retval = usb_bulk_msg(ftdi->udev,
                        usb_rcvbulkpipe(ftdi->udev, ftdi->bulk_in_endpointAddr),
                         ftdi->bulk_in_buffer, ftdi->bulk_in_size,
                        &packet_bytes, msecs_to_jiffies(500));
                char diag[30 *3 + 4];
                char *d = diag;
                int m = packet_bytes;
                u8 *c = ftdi->bulk_in_buffer;
                int s = (sizeof(diag) - 1) / 3;
                diag[0] = 0;
                while (s-- > 0 && m-- > 0) {
                        if (s > 0 || m == 0) {
                                d += sprintf(d, " %02X", *c++);
                        } else
                                d += sprintf(d, " ..");
                }
                if (packet_bytes > 2) {
                        ftdi->bulk_in_left = packet_bytes - 2;
                        ftdi->bulk_in_last = 1;
                        goto have;
                } else if (retval == -ETIMEDOUT) {
                        if (retry_on_timeout-- > 0) {
                                dev_err(&ftdi->udev->dev, "TIMED OUT with packe"
                                        "t_bytes = %d with total %d bytes%s\n",
                                        packet_bytes, bytes_read, diag);
                                goto more;
                        } else if (bytes_read > 0) {
                                dev_err(&ftdi->udev->dev, "ONLY %d bytes%s\n",
                                        bytes_read, diag);
                                return -ENOMEM;
                        } else {
                                dev_err(&ftdi->udev->dev, "TIMED OUT with packe"
                                        "t_bytes = %d with total %d bytes%s\n",
                                        packet_bytes, bytes_read, diag);
                                return -ENOMEM;
                        }
                } else if (retval == -EILSEQ) {
                        dev_err(&ftdi->udev->dev, "error = %d with packet_bytes"
                                " = %d with total %d bytes%s\n", retval,
                                packet_bytes, bytes_read, diag);
                        return retval;
                } else if (retval) {
                        dev_err(&ftdi->udev->dev, "error = %d with packet_bytes"
                                " = %d with total %d bytes%s\n", retval,
                                packet_bytes, bytes_read, diag);
                        return retval;
                } else if (packet_bytes == 2) {
                        unsigned char s0 = ftdi->bulk_in_buffer[0];
                        unsigned char s1 = ftdi->bulk_in_buffer[1];
                        empty_packets += 1;
                        if (s0 == 0x31 && s1 == 0x60) {
                                if (retry_on_empty-- > 0) {
                                        goto more;
                                } else
                                        return 0;
                        } else if (s0 == 0x31 && s1 == 0x00) {
                                if (retry_on_empty-- > 0) {
                                        goto more;
                                } else
                                        return 0;
                        } else {
                                if (retry_on_empty-- > 0) {
                                        goto more;
                                } else
                                        return 0;
                        }
                } else if (packet_bytes == 1) {
                        if (retry_on_empty-- > 0) {
                                goto more;
                        } else
                                return 0;
                } else {
                        if (retry_on_empty-- > 0) {
                                goto more;
                        } else
                                return 0;
                }
        }
      more:{
                goto read;
        }
      have:if (ftdi->bulk_in_left > 0) {
                u8 c = ftdi->bulk_in_buffer[++ftdi->bulk_in_last];
                bytes_read += 1;
                ftdi->bulk_in_left -= 1;
                if (ftdi->recieved == 0 && c == 0xFF) {
                        goto have;
                } else
                        *b++ = c;
                if (++ftdi->recieved < ftdi->expected) {
                        goto have;
                } else if (ftdi->ed_found) {
                        int ed_number = (ftdi->response[0] >> 5) & 0x03;
                        u16 ed_length = (ftdi->response[2] << 8) |
                                ftdi->response[1];
                        struct u132_target *target = &ftdi->target[ed_number];
                        int payload = (ed_length >> 0) & 0x07FF;
                        char diag[30 *3 + 4];
                        char *d = diag;
                        int m = payload;
                        u8 *c = 4 + ftdi->response;
                        int s = (sizeof(diag) - 1) / 3;
                        diag[0] = 0;
                        while (s-- > 0 && m-- > 0) {
                                if (s > 0 || m == 0) {
                                        d += sprintf(d, " %02X", *c++);
                                } else
                                        d += sprintf(d, " ..");
                        }
                        ftdi_elan_do_callback(ftdi, target, 4 + ftdi->response,
                                payload);
                        ftdi->recieved = 0;
                        ftdi->expected = 4;
                        ftdi->ed_found = 0;
                        b = ftdi->response;
                        goto have;
                } else if (ftdi->expected == 8) {
                        u8 buscmd;
                        int respond_head = ftdi->respond_head++;
                        struct u132_respond *respond = &ftdi->respond[
                                RESPOND_MASK & respond_head];
                        u32 data = ftdi->response[7];
                        data <<= 8;
                        data |= ftdi->response[6];
                        data <<= 8;
                        data |= ftdi->response[5];
                        data <<= 8;
                        data |= ftdi->response[4];
                        *respond->value = data;
                        *respond->result = 0;
                        complete(&respond->wait_completion);
                        ftdi->recieved = 0;
                        ftdi->expected = 4;
                        ftdi->ed_found = 0;
                        b = ftdi->response;
                        buscmd = (ftdi->response[0] >> 0) & 0x0F;
                        if (buscmd == 0x00) {
                        } else if (buscmd == 0x02) {
                        } else if (buscmd == 0x06) {
                        } else if (buscmd == 0x0A) {
                        } else
                                dev_err(&ftdi->udev->dev, "Uxxx unknown(%0X) va"
                                        "lue = %08X\n", buscmd, data);
                        goto have;
                } else {
                        if ((ftdi->response[0] & 0x80) == 0x00) {
                                ftdi->expected = 8;
                                goto have;
                        } else {
                                int ed_number = (ftdi->response[0] >> 5) & 0x03;
                                int ed_type = (ftdi->response[0] >> 0) & 0x03;
                                u16 ed_length = (ftdi->response[2] << 8) |
                                        ftdi->response[1];
                                struct u132_target *target = &ftdi->target[
                                        ed_number];
                                target->halted = (ftdi->response[0] >> 3) &
                                        0x01;
                                target->skipped = (ftdi->response[0] >> 2) &
                                        0x01;
                                target->toggle_bits = (ftdi->response[3] >> 6)
                                        & 0x03;
                                target->error_count = (ftdi->response[3] >> 4)
                                        & 0x03;
                                target->condition_code = (ftdi->response[
                                        3] >> 0) & 0x0F;
                                if ((ftdi->response[0] & 0x10) == 0x00) {
                                        b = have_ed_set_response(ftdi, target,
                                                ed_length, ed_number, ed_type,
                                                b);
                                        goto have;
                                } else {
                                        b = have_ed_get_response(ftdi, target,
                                                ed_length, ed_number, ed_type,
                                                b);
                                        goto have;
                                }
                        }
                }
        } else
                goto more;
}


/*
* create a urb, and a buffer for it, and copy the data to the urb
*
*/
static ssize_t ftdi_elan_write(struct file *file,
			       const char __user *user_buffer, size_t count,
			       loff_t *ppos)
{
        int retval = 0;
        struct urb *urb;
        char *buf;
        struct usb_ftdi *ftdi = file->private_data;

        if (ftdi->disconnected > 0) {
                return -ENODEV;
        }
        if (count == 0) {
                goto exit;
        }
        urb = usb_alloc_urb(0, GFP_KERNEL);
        if (!urb) {
                retval = -ENOMEM;
                goto error_1;
        }
        buf = usb_buffer_alloc(ftdi->udev, count, GFP_KERNEL,
                &urb->transfer_dma);
        if (!buf) {
                retval = -ENOMEM;
                goto error_2;
        }
        if (copy_from_user(buf, user_buffer, count)) {
                retval = -EFAULT;
                goto error_3;
        }
        usb_fill_bulk_urb(urb, ftdi->udev, usb_sndbulkpipe(ftdi->udev,
                ftdi->bulk_out_endpointAddr), buf, count,
                ftdi_elan_write_bulk_callback, ftdi);
        urb->transfer_flags |= URB_NO_TRANSFER_DMA_MAP;
        retval = usb_submit_urb(urb, GFP_KERNEL);
        if (retval) {
                dev_err(&ftdi->udev->dev, "failed submitting write urb, error %"
                        "d\n", retval);
                goto error_3;
        }
        usb_free_urb(urb);

exit:
        return count;
error_3:
	usb_buffer_free(ftdi->udev, count, buf, urb->transfer_dma);
error_2:
	usb_free_urb(urb);
error_1:
	return retval;
}

static struct file_operations ftdi_elan_fops = {
        .owner = THIS_MODULE,
        .llseek = no_llseek,
        .ioctl = ftdi_elan_ioctl,
        .read = ftdi_elan_read,
        .write = ftdi_elan_write,
        .open = ftdi_elan_open,
        .release = ftdi_elan_release,
};

/*
* usb class driver info in order to get a minor number from the usb core,
* and to have the device registered with the driver core
*/
static struct usb_class_driver ftdi_elan_jtag_class = {
        .name = "ftdi-%d-jtag",
        .fops = &ftdi_elan_fops,
        .minor_base = USB_FTDI_ELAN_MINOR_BASE,
};

/*
* the following definitions are for the
* ELAN FPGA state machgine processor that
* lies on the other side of the FTDI chip
*/
#define cPCIu132rd 0x0
#define cPCIu132wr 0x1
#define cPCIiord 0x2
#define cPCIiowr 0x3
#define cPCImemrd 0x6
#define cPCImemwr 0x7
#define cPCIcfgrd 0xA
#define cPCIcfgwr 0xB
#define cPCInull 0xF
#define cU132cmd_status 0x0
#define cU132flash 0x1
#define cPIDsetup 0x0
#define cPIDout 0x1
#define cPIDin 0x2
#define cPIDinonce 0x3
#define cCCnoerror 0x0
#define cCCcrc 0x1
#define cCCbitstuff 0x2
#define cCCtoggle 0x3
#define cCCstall 0x4
#define cCCnoresp 0x5
#define cCCbadpid1 0x6
#define cCCbadpid2 0x7
#define cCCdataoverrun 0x8
#define cCCdataunderrun 0x9
#define cCCbuffoverrun 0xC
#define cCCbuffunderrun 0xD
#define cCCnotaccessed 0xF
static int ftdi_elan_write_reg(struct usb_ftdi *ftdi, u32 data)
{
      wait:if (ftdi->disconnected > 0) {
                return -ENODEV;
        } else {
                int command_size;
                down(&ftdi->u132_lock);
                command_size = ftdi->command_next - ftdi->command_head;
                if (command_size < COMMAND_SIZE) {
                        struct u132_command *command = &ftdi->command[
                                COMMAND_MASK & ftdi->command_next];
                        command->header = 0x00 | cPCIu132wr;
                        command->length = 0x04;
                        command->address = 0x00;
                        command->width = 0x00;
                        command->follows = 4;
                        command->value = data;
                        command->buffer = &command->value;
                        ftdi->command_next += 1;
                        ftdi_elan_kick_command_queue(ftdi);
                        up(&ftdi->u132_lock);
                        return 0;
                } else {
                        up(&ftdi->u132_lock);
                        msleep(100);
                        goto wait;
                }
        }
}

static int ftdi_elan_write_config(struct usb_ftdi *ftdi, int config_offset,
        u8 width, u32 data)
{
        u8 addressofs = config_offset / 4;
      wait:if (ftdi->disconnected > 0) {
                return -ENODEV;
        } else {
                int command_size;
                down(&ftdi->u132_lock);
                command_size = ftdi->command_next - ftdi->command_head;
                if (command_size < COMMAND_SIZE) {
                        struct u132_command *command = &ftdi->command[
                                COMMAND_MASK & ftdi->command_next];
                        command->header = 0x00 | (cPCIcfgwr & 0x0F);
                        command->length = 0x04;
                        command->address = addressofs;
                        command->width = 0x00 | (width & 0x0F);
                        command->follows = 4;
                        command->value = data;
                        command->buffer = &command->value;
                        ftdi->command_next += 1;
                        ftdi_elan_kick_command_queue(ftdi);
                        up(&ftdi->u132_lock);
                        return 0;
                } else {
                        up(&ftdi->u132_lock);
                        msleep(100);
                        goto wait;
                }
        }
}

static int ftdi_elan_write_pcimem(struct usb_ftdi *ftdi, int mem_offset,
        u8 width, u32 data)
{
        u8 addressofs = mem_offset / 4;
      wait:if (ftdi->disconnected > 0) {
                return -ENODEV;
        } else {
                int command_size;
                down(&ftdi->u132_lock);
                command_size = ftdi->command_next - ftdi->command_head;
                if (command_size < COMMAND_SIZE) {
                        struct u132_command *command = &ftdi->command[
                                COMMAND_MASK & ftdi->command_next];
                        command->header = 0x00 | (cPCImemwr & 0x0F);
                        command->length = 0x04;
                        command->address = addressofs;
                        command->width = 0x00 | (width & 0x0F);
                        command->follows = 4;
                        command->value = data;
                        command->buffer = &command->value;
                        ftdi->command_next += 1;
                        ftdi_elan_kick_command_queue(ftdi);
                        up(&ftdi->u132_lock);
                        return 0;
                } else {
                        up(&ftdi->u132_lock);
                        msleep(100);
                        goto wait;
                }
        }
}

int usb_ftdi_elan_write_pcimem(struct platform_device *pdev, int mem_offset,
        u8 width, u32 data)
{
        struct usb_ftdi *ftdi = platform_device_to_usb_ftdi(pdev);
        return ftdi_elan_write_pcimem(ftdi, mem_offset, width, data);
}


EXPORT_SYMBOL_GPL(usb_ftdi_elan_write_pcimem);
static int ftdi_elan_read_reg(struct usb_ftdi *ftdi, u32 *data)
{
      wait:if (ftdi->disconnected > 0) {
                return -ENODEV;
        } else {
                int command_size;
                int respond_size;
                down(&ftdi->u132_lock);
                command_size = ftdi->command_next - ftdi->command_head;
                respond_size = ftdi->respond_next - ftdi->respond_head;
                if (command_size < COMMAND_SIZE && respond_size < RESPOND_SIZE)
                        {
                        struct u132_command *command = &ftdi->command[
                                COMMAND_MASK & ftdi->command_next];
                        struct u132_respond *respond = &ftdi->respond[
                                RESPOND_MASK & ftdi->respond_next];
                        int result = -ENODEV;
                        respond->result = &result;
                        respond->header = command->header = 0x00 | cPCIu132rd;
                        command->length = 0x04;
                        respond->address = command->address = cU132cmd_status;
                        command->width = 0x00;
                        command->follows = 0;
                        command->value = 0;
                        command->buffer = NULL;
                        respond->value = data;
                        init_completion(&respond->wait_completion);
                        ftdi->command_next += 1;
                        ftdi->respond_next += 1;
                        ftdi_elan_kick_command_queue(ftdi);
                        up(&ftdi->u132_lock);
                        wait_for_completion(&respond->wait_completion);
                        return result;
                } else {
                        up(&ftdi->u132_lock);
                        msleep(100);
                        goto wait;
                }
        }
}

int usb_ftdi_elan_read_reg(struct platform_device *pdev, u32 *data)
{
        struct usb_ftdi *ftdi = platform_device_to_usb_ftdi(pdev);
        return ftdi_elan_read_reg(ftdi, data);
}


EXPORT_SYMBOL_GPL(usb_ftdi_elan_read_reg);
static int ftdi_elan_read_config(struct usb_ftdi *ftdi, int config_offset,
        u8 width, u32 *data)
{
        u8 addressofs = config_offset / 4;
      wait:if (ftdi->disconnected > 0) {
                return -ENODEV;
        } else {
                int command_size;
                int respond_size;
                down(&ftdi->u132_lock);
                command_size = ftdi->command_next - ftdi->command_head;
                respond_size = ftdi->respond_next - ftdi->respond_head;
                if (command_size < COMMAND_SIZE && respond_size < RESPOND_SIZE)
                        {
                        struct u132_command *command = &ftdi->command[
                                COMMAND_MASK & ftdi->command_next];
                        struct u132_respond *respond = &ftdi->respond[
                                RESPOND_MASK & ftdi->respond_next];
                        int result = -ENODEV;
                        respond->result = &result;
                        respond->header = command->header = 0x00 | (cPCIcfgrd &
                                0x0F);
                        command->length = 0x04;
                        respond->address = command->address = addressofs;
                        command->width = 0x00 | (width & 0x0F);
                        command->follows = 0;
                        command->value = 0;
                        command->buffer = NULL;
                        respond->value = data;
                        init_completion(&respond->wait_completion);
                        ftdi->command_next += 1;
                        ftdi->respond_next += 1;
                        ftdi_elan_kick_command_queue(ftdi);
                        up(&ftdi->u132_lock);
                        wait_for_completion(&respond->wait_completion);
                        return result;
                } else {
                        up(&ftdi->u132_lock);
                        msleep(100);
                        goto wait;
                }
        }
}

static int ftdi_elan_read_pcimem(struct usb_ftdi *ftdi, int mem_offset,
        u8 width, u32 *data)
{
        u8 addressofs = mem_offset / 4;
      wait:if (ftdi->disconnected > 0) {
                return -ENODEV;
        } else {
                int command_size;
                int respond_size;
                down(&ftdi->u132_lock);
                command_size = ftdi->command_next - ftdi->command_head;
                respond_size = ftdi->respond_next - ftdi->respond_head;
                if (command_size < COMMAND_SIZE && respond_size < RESPOND_SIZE)
                        {
                        struct u132_command *command = &ftdi->command[
                                COMMAND_MASK & ftdi->command_next];
                        struct u132_respond *respond = &ftdi->respond[
                                RESPOND_MASK & ftdi->respond_next];
                        int result = -ENODEV;
                        respond->result = &result;
                        respond->header = command->header = 0x00 | (cPCImemrd &
                                0x0F);
                        command->length = 0x04;
                        respond->address = command->address = addressofs;
                        command->width = 0x00 | (width & 0x0F);
                        command->follows = 0;
                        command->value = 0;
                        command->buffer = NULL;
                        respond->value = data;
                        init_completion(&respond->wait_completion);
                        ftdi->command_next += 1;
                        ftdi->respond_next += 1;
                        ftdi_elan_kick_command_queue(ftdi);
                        up(&ftdi->u132_lock);
                        wait_for_completion(&respond->wait_completion);
                        return result;
                } else {
                        up(&ftdi->u132_lock);
                        msleep(100);
                        goto wait;
                }
        }
}

int usb_ftdi_elan_read_pcimem(struct platform_device *pdev, int mem_offset,
        u8 width, u32 *data)
{
        struct usb_ftdi *ftdi = platform_device_to_usb_ftdi(pdev);
        if (ftdi->initialized == 0) {
                return -ENODEV;
        } else
                return ftdi_elan_read_pcimem(ftdi, mem_offset, width, data);
}


EXPORT_SYMBOL_GPL(usb_ftdi_elan_read_pcimem);
static int ftdi_elan_edset_setup(struct usb_ftdi *ftdi, u8 ed_number,
        void *endp, struct urb *urb, u8 address, u8 ep_number, u8 toggle_bits,
        void (*callback) (void *endp, struct urb *urb, u8 *buf, int len,
        int toggle_bits, int error_count, int condition_code, int repeat_number,
         int halted, int skipped, int actual, int non_null))
{
        u8 ed = ed_number - 1;
      wait:if (ftdi->disconnected > 0) {
                return -ENODEV;
        } else if (ftdi->initialized == 0) {
                return -ENODEV;
        } else {
                int command_size;
                down(&ftdi->u132_lock);
                command_size = ftdi->command_next - ftdi->command_head;
                if (command_size < COMMAND_SIZE) {
                        struct u132_target *target = &ftdi->target[ed];
                        struct u132_command *command = &ftdi->command[
                                COMMAND_MASK & ftdi->command_next];
                        command->header = 0x80 | (ed << 5);
                        command->length = 0x8007;
                        command->address = (toggle_bits << 6) | (ep_number << 2)
                                | (address << 0);
                        command->width = usb_maxpacket(urb->dev, urb->pipe,
                                usb_pipeout(urb->pipe));
                        command->follows = 8;
                        command->value = 0;
                        command->buffer = urb->setup_packet;
                        target->callback = callback;
                        target->endp = endp;
                        target->urb = urb;
                        target->active = 1;
                        ftdi->command_next += 1;
                        ftdi_elan_kick_command_queue(ftdi);
                        up(&ftdi->u132_lock);
                        return 0;
                } else {
                        up(&ftdi->u132_lock);
                        msleep(100);
                        goto wait;
                }
        }
}

int usb_ftdi_elan_edset_setup(struct platform_device *pdev, u8 ed_number,
        void *endp, struct urb *urb, u8 address, u8 ep_number, u8 toggle_bits,
        void (*callback) (void *endp, struct urb *urb, u8 *buf, int len,
        int toggle_bits, int error_count, int condition_code, int repeat_number,
         int halted, int skipped, int actual, int non_null))
{
        struct usb_ftdi *ftdi = platform_device_to_usb_ftdi(pdev);
        return ftdi_elan_edset_setup(ftdi, ed_number, endp, urb, address,
                ep_number, toggle_bits, callback);
}


EXPORT_SYMBOL_GPL(usb_ftdi_elan_edset_setup);
static int ftdi_elan_edset_input(struct usb_ftdi *ftdi, u8 ed_number,
        void *endp, struct urb *urb, u8 address, u8 ep_number, u8 toggle_bits,
        void (*callback) (void *endp, struct urb *urb, u8 *buf, int len,
        int toggle_bits, int error_count, int condition_code, int repeat_number,
         int halted, int skipped, int actual, int non_null))
{
        u8 ed = ed_number - 1;
      wait:if (ftdi->disconnected > 0) {
                return -ENODEV;
        } else if (ftdi->initialized == 0) {
                return -ENODEV;
        } else {
                int command_size;
                down(&ftdi->u132_lock);
                command_size = ftdi->command_next - ftdi->command_head;
                if (command_size < COMMAND_SIZE) {
                        struct u132_target *target = &ftdi->target[ed];
                        struct u132_command *command = &ftdi->command[
                                COMMAND_MASK & ftdi->command_next];
                        int remaining_length = urb->transfer_buffer_length -
                                urb->actual_length;
                        command->header = 0x82 | (ed << 5);
                        if (remaining_length == 0) {
                                command->length = 0x0000;
                        } else if (remaining_length > 1024) {
                                command->length = 0x8000 | 1023;
                        } else
                                command->length = 0x8000 | (remaining_length -
                                        1);
                        command->address = (toggle_bits << 6) | (ep_number << 2)
                                | (address << 0);
                        command->width = usb_maxpacket(urb->dev, urb->pipe,
                                usb_pipeout(urb->pipe));
                        command->follows = 0;
                        command->value = 0;
                        command->buffer = NULL;
                        target->callback = callback;
                        target->endp = endp;
                        target->urb = urb;
                        target->active = 1;
                        ftdi->command_next += 1;
                        ftdi_elan_kick_command_queue(ftdi);
                        up(&ftdi->u132_lock);
                        return 0;
                } else {
                        up(&ftdi->u132_lock);
                        msleep(100);
                        goto wait;
                }
        }
}

int usb_ftdi_elan_edset_input(struct platform_device *pdev, u8 ed_number,
        void *endp, struct urb *urb, u8 address, u8 ep_number, u8 toggle_bits,
        void (*callback) (void *endp, struct urb *urb, u8 *buf, int len,
        int toggle_bits, int error_count, int condition_code, int repeat_number,
         int halted, int skipped, int actual, int non_null))
{
        struct usb_ftdi *ftdi = platform_device_to_usb_ftdi(pdev);
        return ftdi_elan_edset_input(ftdi, ed_number, endp, urb, address,
                ep_number, toggle_bits, callback);
}


EXPORT_SYMBOL_GPL(usb_ftdi_elan_edset_input);
static int ftdi_elan_edset_empty(struct usb_ftdi *ftdi, u8 ed_number,
        void *endp, struct urb *urb, u8 address, u8 ep_number, u8 toggle_bits,
        void (*callback) (void *endp, struct urb *urb, u8 *buf, int len,
        int toggle_bits, int error_count, int condition_code, int repeat_number,
         int halted, int skipped, int actual, int non_null))
{
        u8 ed = ed_number - 1;
      wait:if (ftdi->disconnected > 0) {
                return -ENODEV;
        } else if (ftdi->initialized == 0) {
                return -ENODEV;
        } else {
                int command_size;
                down(&ftdi->u132_lock);
                command_size = ftdi->command_next - ftdi->command_head;
                if (command_size < COMMAND_SIZE) {
                        struct u132_target *target = &ftdi->target[ed];
                        struct u132_command *command = &ftdi->command[
                                COMMAND_MASK & ftdi->command_next];
                        command->header = 0x81 | (ed << 5);
                        command->length = 0x0000;
                        command->address = (toggle_bits << 6) | (ep_number << 2)
                                | (address << 0);
                        command->width = usb_maxpacket(urb->dev, urb->pipe,
                                usb_pipeout(urb->pipe));
                        command->follows = 0;
                        command->value = 0;
                        command->buffer = NULL;
                        target->callback = callback;
                        target->endp = endp;
                        target->urb = urb;
                        target->active = 1;
                        ftdi->command_next += 1;
                        ftdi_elan_kick_command_queue(ftdi);
                        up(&ftdi->u132_lock);
                        return 0;
                } else {
                        up(&ftdi->u132_lock);
                        msleep(100);
                        goto wait;
                }
        }
}

int usb_ftdi_elan_edset_empty(struct platform_device *pdev, u8 ed_number,
        void *endp, struct urb *urb, u8 address, u8 ep_number, u8 toggle_bits,
        void (*callback) (void *endp, struct urb *urb, u8 *buf, int len,
        int toggle_bits, int error_count, int condition_code, int repeat_number,
         int halted, int skipped, int actual, int non_null))
{
        struct usb_ftdi *ftdi = platform_device_to_usb_ftdi(pdev);
        return ftdi_elan_edset_empty(ftdi, ed_number, endp, urb, address,
                ep_number, toggle_bits, callback);
}


EXPORT_SYMBOL_GPL(usb_ftdi_elan_edset_empty);
static int ftdi_elan_edset_output(struct usb_ftdi *ftdi, u8 ed_number,
        void *endp, struct urb *urb, u8 address, u8 ep_number, u8 toggle_bits,
        void (*callback) (void *endp, struct urb *urb, u8 *buf, int len,
        int toggle_bits, int error_count, int condition_code, int repeat_number,
         int halted, int skipped, int actual, int non_null))
{
        u8 ed = ed_number - 1;
      wait:if (ftdi->disconnected > 0) {
                return -ENODEV;
        } else if (ftdi->initialized == 0) {
                return -ENODEV;
        } else {
                int command_size;
                down(&ftdi->u132_lock);
                command_size = ftdi->command_next - ftdi->command_head;
                if (command_size < COMMAND_SIZE) {
                        u8 *b;
                        u16 urb_size;
                        int i = 0;
                        char data[30 *3 + 4];
                        char *d = data;
                        int m = (sizeof(data) - 1) / 3;
                        int l = 0;
                        struct u132_target *target = &ftdi->target[ed];
                        struct u132_command *command = &ftdi->command[
                                COMMAND_MASK & ftdi->command_next];
                        command->header = 0x81 | (ed << 5);
                        command->address = (toggle_bits << 6) | (ep_number << 2)
                                | (address << 0);
                        command->width = usb_maxpacket(urb->dev, urb->pipe,
                                usb_pipeout(urb->pipe));
                        command->follows = min(1024,
                                urb->transfer_buffer_length -
                                urb->actual_length);
                        command->value = 0;
                        command->buffer = urb->transfer_buffer +
                                urb->actual_length;
                        command->length = 0x8000 | (command->follows - 1);
                        b = command->buffer;
                        urb_size = command->follows;
                        data[0] = 0;
                        while (urb_size-- > 0) {
                                if (i > m) {
                                } else if (i++ < m) {
                                        int w = sprintf(d, " %02X", *b++);
                                        d += w;
                                        l += w;
                                } else
                                        d += sprintf(d, " ..");
                        }
                        target->callback = callback;
                        target->endp = endp;
                        target->urb = urb;
                        target->active = 1;
                        ftdi->command_next += 1;
                        ftdi_elan_kick_command_queue(ftdi);
                        up(&ftdi->u132_lock);
                        return 0;
                } else {
                        up(&ftdi->u132_lock);
                        msleep(100);
                        goto wait;
                }
        }
}

int usb_ftdi_elan_edset_output(struct platform_device *pdev, u8 ed_number,
        void *endp, struct urb *urb, u8 address, u8 ep_number, u8 toggle_bits,
        void (*callback) (void *endp, struct urb *urb, u8 *buf, int len,
        int toggle_bits, int error_count, int condition_code, int repeat_number,
         int halted, int skipped, int actual, int non_null))
{
        struct usb_ftdi *ftdi = platform_device_to_usb_ftdi(pdev);
        return ftdi_elan_edset_output(ftdi, ed_number, endp, urb, address,
                ep_number, toggle_bits, callback);
}


EXPORT_SYMBOL_GPL(usb_ftdi_elan_edset_output);
static int ftdi_elan_edset_single(struct usb_ftdi *ftdi, u8 ed_number,
        void *endp, struct urb *urb, u8 address, u8 ep_number, u8 toggle_bits,
        void (*callback) (void *endp, struct urb *urb, u8 *buf, int len,
        int toggle_bits, int error_count, int condition_code, int repeat_number,
         int halted, int skipped, int actual, int non_null))
{
        u8 ed = ed_number - 1;
      wait:if (ftdi->disconnected > 0) {
                return -ENODEV;
        } else if (ftdi->initialized == 0) {
                return -ENODEV;
        } else {
                int command_size;
                down(&ftdi->u132_lock);
                command_size = ftdi->command_next - ftdi->command_head;
                if (command_size < COMMAND_SIZE) {
                        int remaining_length = urb->transfer_buffer_length -
                                urb->actual_length;
                        struct u132_target *target = &ftdi->target[ed];
                        struct u132_command *command = &ftdi->command[
                                COMMAND_MASK & ftdi->command_next];
                        command->header = 0x83 | (ed << 5);
                        if (remaining_length == 0) {
                                command->length = 0x0000;
                        } else if (remaining_length > 1024) {
                                command->length = 0x8000 | 1023;
                        } else
                                command->length = 0x8000 | (remaining_length -
                                        1);
                        command->address = (toggle_bits << 6) | (ep_number << 2)
                                | (address << 0);
                        command->width = usb_maxpacket(urb->dev, urb->pipe,
                                usb_pipeout(urb->pipe));
                        command->follows = 0;
                        command->value = 0;
                        command->buffer = NULL;
                        target->callback = callback;
                        target->endp = endp;
                        target->urb = urb;
                        target->active = 1;
                        ftdi->command_next += 1;
                        ftdi_elan_kick_command_queue(ftdi);
                        up(&ftdi->u132_lock);
                        return 0;
                } else {
                        up(&ftdi->u132_lock);
                        msleep(100);
                        goto wait;
                }
        }
}

int usb_ftdi_elan_edset_single(struct platform_device *pdev, u8 ed_number,
        void *endp, struct urb *urb, u8 address, u8 ep_number, u8 toggle_bits,
        void (*callback) (void *endp, struct urb *urb, u8 *buf, int len,
        int toggle_bits, int error_count, int condition_code, int repeat_number,
         int halted, int skipped, int actual, int non_null))
{
        struct usb_ftdi *ftdi = platform_device_to_usb_ftdi(pdev);
        return ftdi_elan_edset_single(ftdi, ed_number, endp, urb, address,
                ep_number, toggle_bits, callback);
}


EXPORT_SYMBOL_GPL(usb_ftdi_elan_edset_single);
static int ftdi_elan_edset_flush(struct usb_ftdi *ftdi, u8 ed_number,
        void *endp)
{
        u8 ed = ed_number - 1;
        if (ftdi->disconnected > 0) {
                return -ENODEV;
        } else if (ftdi->initialized == 0) {
                return -ENODEV;
        } else {
                struct u132_target *target = &ftdi->target[ed];
                down(&ftdi->u132_lock);
                if (target->abandoning > 0) {
                        up(&ftdi->u132_lock);
                        return 0;
                } else {
                        target->abandoning = 1;
                      wait_1:if (target->active == 1) {
                                int command_size = ftdi->command_next -
                                        ftdi->command_head;
                                if (command_size < COMMAND_SIZE) {
                                        struct u132_command *command =
                                                &ftdi->command[COMMAND_MASK &
                                                ftdi->command_next];
                                        command->header = 0x80 | (ed << 5) |
                                                0x4;
                                        command->length = 0x00;
                                        command->address = 0x00;
                                        command->width = 0x00;
                                        command->follows = 0;
                                        command->value = 0;
                                        command->buffer = &command->value;
                                        ftdi->command_next += 1;
                                        ftdi_elan_kick_command_queue(ftdi);
                                } else {
                                        up(&ftdi->u132_lock);
                                        msleep(100);
                                        down(&ftdi->u132_lock);
                                        goto wait_1;
                                }
                        }
                        up(&ftdi->u132_lock);
                        return 0;
                }
        }
}

int usb_ftdi_elan_edset_flush(struct platform_device *pdev, u8 ed_number,
        void *endp)
{
        struct usb_ftdi *ftdi = platform_device_to_usb_ftdi(pdev);
        return ftdi_elan_edset_flush(ftdi, ed_number, endp);
}


EXPORT_SYMBOL_GPL(usb_ftdi_elan_edset_flush);
static int ftdi_elan_flush_input_fifo(struct usb_ftdi *ftdi)
{
        int retry_on_empty = 10;
        int retry_on_timeout = 5;
        int retry_on_status = 20;
      more:{
                int packet_bytes = 0;
                int retval = usb_bulk_msg(ftdi->udev,
                        usb_rcvbulkpipe(ftdi->udev, ftdi->bulk_in_endpointAddr),
                         ftdi->bulk_in_buffer, ftdi->bulk_in_size,
                        &packet_bytes, msecs_to_jiffies(100));
                if (packet_bytes > 2) {
                        char diag[30 *3 + 4];
                        char *d = diag;
                        int m = (sizeof(diag) - 1) / 3;
                        char *b = ftdi->bulk_in_buffer;
                        int bytes_read = 0;
                        diag[0] = 0;
                        while (packet_bytes-- > 0) {
                                char c = *b++;
                                if (bytes_read < m) {
                                        d += sprintf(d, " %02X",
                                                0x000000FF & c);
                                } else if (bytes_read > m) {
                                } else
                                        d += sprintf(d, " ..");
                                bytes_read += 1;
                                continue;
                        }
                        goto more;
                } else if (packet_bytes > 1) {
                        char s1 = ftdi->bulk_in_buffer[0];
                        char s2 = ftdi->bulk_in_buffer[1];
                        if (s1 == 0x31 && s2 == 0x60) {
                                return 0;
                        } else if (retry_on_status-- > 0) {
                                goto more;
                        } else {
                                dev_err(&ftdi->udev->dev, "STATUS ERROR retry l"
                                        "imit reached\n");
                                return -EFAULT;
                        }
                } else if (packet_bytes > 0) {
                        char b1 = ftdi->bulk_in_buffer[0];
                        dev_err(&ftdi->udev->dev, "only one byte flushed from F"
                                "TDI = %02X\n", b1);
                        if (retry_on_status-- > 0) {
                                goto more;
                        } else {
                                dev_err(&ftdi->udev->dev, "STATUS ERROR retry l"
                                        "imit reached\n");
                                return -EFAULT;
                        }
                } else if (retval == -ETIMEDOUT) {
                        if (retry_on_timeout-- > 0) {
                                goto more;
                        } else {
                                dev_err(&ftdi->udev->dev, "TIMED OUT retry limi"
                                        "t reached\n");
                                return -ENOMEM;
                        }
                } else if (retval == 0) {
                        if (retry_on_empty-- > 0) {
                                goto more;
                        } else {
                                dev_err(&ftdi->udev->dev, "empty packet retry l"
                                        "imit reached\n");
                                return -ENOMEM;
                        }
                } else {
                        dev_err(&ftdi->udev->dev, "error = %d\n", retval);
                        return retval;
                }
        }
        return -1;
}


/*
* send the long flush sequence
*
*/
static int ftdi_elan_synchronize_flush(struct usb_ftdi *ftdi)
{
        int retval;
        struct urb *urb;
        char *buf;
        int I = 257;
        int i = 0;
        urb = usb_alloc_urb(0, GFP_KERNEL);
        if (!urb) {
                dev_err(&ftdi->udev->dev, "could not alloc a urb for flush sequ"
                        "ence\n");
                return -ENOMEM;
        }
        buf = usb_buffer_alloc(ftdi->udev, I, GFP_KERNEL, &urb->transfer_dma);
        if (!buf) {
                dev_err(&ftdi->udev->dev, "could not get a buffer for flush seq"
                        "uence\n");
                usb_free_urb(urb);
                return -ENOMEM;
        }
        while (I-- > 0)
                buf[i++] = 0x55;
        usb_fill_bulk_urb(urb, ftdi->udev, usb_sndbulkpipe(ftdi->udev,
                ftdi->bulk_out_endpointAddr), buf, i,
                ftdi_elan_write_bulk_callback, ftdi);
        urb->transfer_flags |= URB_NO_TRANSFER_DMA_MAP;
        retval = usb_submit_urb(urb, GFP_KERNEL);
        if (retval) {
                dev_err(&ftdi->udev->dev, "failed to submit urb containing the "
                        "flush sequence\n");
                usb_buffer_free(ftdi->udev, i, buf, urb->transfer_dma);
                usb_free_urb(urb);
                return -ENOMEM;
        }
        usb_free_urb(urb);
        return 0;
}


/*
* send the reset sequence
*
*/
static int ftdi_elan_synchronize_reset(struct usb_ftdi *ftdi)
{
        int retval;
        struct urb *urb;
        char *buf;
        int I = 4;
        int i = 0;
        urb = usb_alloc_urb(0, GFP_KERNEL);
        if (!urb) {
                dev_err(&ftdi->udev->dev, "could not get a urb for the reset se"
                        "quence\n");
                return -ENOMEM;
        }
        buf = usb_buffer_alloc(ftdi->udev, I, GFP_KERNEL, &urb->transfer_dma);
        if (!buf) {
                dev_err(&ftdi->udev->dev, "could not get a buffer for the reset"
                        " sequence\n");
                usb_free_urb(urb);
                return -ENOMEM;
        }
        buf[i++] = 0x55;
        buf[i++] = 0xAA;
        buf[i++] = 0x5A;
        buf[i++] = 0xA5;
        usb_fill_bulk_urb(urb, ftdi->udev, usb_sndbulkpipe(ftdi->udev,
                ftdi->bulk_out_endpointAddr), buf, i,
                ftdi_elan_write_bulk_callback, ftdi);
        urb->transfer_flags |= URB_NO_TRANSFER_DMA_MAP;
        retval = usb_submit_urb(urb, GFP_KERNEL);
        if (retval) {
                dev_err(&ftdi->udev->dev, "failed to submit urb containing the "
                        "reset sequence\n");
                usb_buffer_free(ftdi->udev, i, buf, urb->transfer_dma);
                usb_free_urb(urb);
                return -ENOMEM;
        }
        usb_free_urb(urb);
        return 0;
}

static int ftdi_elan_synchronize(struct usb_ftdi *ftdi)
{
        int retval;
        int long_stop = 10;
        int retry_on_timeout = 5;
        int retry_on_empty = 10;
        int err_count = 0;
        retval = ftdi_elan_flush_input_fifo(ftdi);
        if (retval)
                return retval;
        ftdi->bulk_in_left = 0;
        ftdi->bulk_in_last = -1;
        while (long_stop-- > 0) {
                int read_stop;
                int read_stuck;
                retval = ftdi_elan_synchronize_flush(ftdi);
                if (retval)
                        return retval;
                retval = ftdi_elan_flush_input_fifo(ftdi);
                if (retval)
                        return retval;
              reset:retval = ftdi_elan_synchronize_reset(ftdi);
                if (retval)
                        return retval;
                read_stop = 100;
                read_stuck = 10;
              read:{
                        int packet_bytes = 0;
                        retval = usb_bulk_msg(ftdi->udev,
                                usb_rcvbulkpipe(ftdi->udev,
                                ftdi->bulk_in_endpointAddr),
                                ftdi->bulk_in_buffer, ftdi->bulk_in_size,
                                &packet_bytes, msecs_to_jiffies(500));
                        if (packet_bytes > 2) {
                                char diag[30 *3 + 4];
                                char *d = diag;
                                int m = (sizeof(diag) - 1) / 3;
                                char *b = ftdi->bulk_in_buffer;
                                int bytes_read = 0;
                                unsigned char c = 0;
                                diag[0] = 0;
                                while (packet_bytes-- > 0) {
                                        c = *b++;
                                        if (bytes_read < m) {
                                                d += sprintf(d, " %02X", c);
                                        } else if (bytes_read > m) {
                                        } else
                                                d += sprintf(d, " ..");
                                        bytes_read += 1;
                                        continue;
                                }
                                if (c == 0x7E) {
                                        return 0;
                                } else {
                                        if (c == 0x55) {
                                                goto read;
                                        } else if (read_stop-- > 0) {
                                                goto read;
                                        } else {
                                                dev_err(&ftdi->udev->dev, "retr"
                                                        "y limit reached\n");
                                                continue;
                                        }
                                }
                        } else if (packet_bytes > 1) {
                                unsigned char s1 = ftdi->bulk_in_buffer[0];
                                unsigned char s2 = ftdi->bulk_in_buffer[1];
                                if (s1 == 0x31 && s2 == 0x00) {
                                        if (read_stuck-- > 0) {
                                                goto read;
                                        } else
                                                goto reset;
                                } else if (s1 == 0x31 && s2 == 0x60) {
                                        if (read_stop-- > 0) {
                                                goto read;
                                        } else {
                                                dev_err(&ftdi->udev->dev, "retr"
                                                        "y limit reached\n");
                                                continue;
                                        }
                                } else {
                                        if (read_stop-- > 0) {
                                                goto read;
                                        } else {
                                                dev_err(&ftdi->udev->dev, "retr"
                                                        "y limit reached\n");
                                                continue;
                                        }
                                }
                        } else if (packet_bytes > 0) {
                                if (read_stop-- > 0) {
                                        goto read;
                                } else {
                                        dev_err(&ftdi->udev->dev, "retry limit "
                                                "reached\n");
                                        continue;
                                }
                        } else if (retval == -ETIMEDOUT) {
                                if (retry_on_timeout-- > 0) {
                                        goto read;
                                } else {
                                        dev_err(&ftdi->udev->dev, "TIMED OUT re"
                                                "try limit reached\n");
                                        continue;
                                }
                        } else if (retval == 0) {
                                if (retry_on_empty-- > 0) {
                                        goto read;
                                } else {
                                        dev_err(&ftdi->udev->dev, "empty packet"
                                                " retry limit reached\n");
                                        continue;
                                }
                        } else {
                                err_count += 1;
                                dev_err(&ftdi->udev->dev, "error = %d\n",
                                        retval);
                                if (read_stop-- > 0) {
                                        goto read;
                                } else {
                                        dev_err(&ftdi->udev->dev, "retry limit "
                                                "reached\n");
                                        continue;
                                }
                        }
                }
        }
        dev_err(&ftdi->udev->dev, "failed to synchronize\n");
        return -EFAULT;
}

static int ftdi_elan_stuck_waiting(struct usb_ftdi *ftdi)
{
        int retry_on_empty = 10;
        int retry_on_timeout = 5;
        int retry_on_status = 50;
      more:{
                int packet_bytes = 0;
                int retval = usb_bulk_msg(ftdi->udev,
                        usb_rcvbulkpipe(ftdi->udev, ftdi->bulk_in_endpointAddr),
                         ftdi->bulk_in_buffer, ftdi->bulk_in_size,
                        &packet_bytes, msecs_to_jiffies(1000));
                if (packet_bytes > 2) {
                        char diag[30 *3 + 4];
                        char *d = diag;
                        int m = (sizeof(diag) - 1) / 3;
                        char *b = ftdi->bulk_in_buffer;
                        int bytes_read = 0;
                        diag[0] = 0;
                        while (packet_bytes-- > 0) {
                                char c = *b++;
                                if (bytes_read < m) {
                                        d += sprintf(d, " %02X",
                                                0x000000FF & c);
                                } else if (bytes_read > m) {
                                } else
                                        d += sprintf(d, " ..");
                                bytes_read += 1;
                                continue;
                        }
                        goto more;
                } else if (packet_bytes > 1) {
                        char s1 = ftdi->bulk_in_buffer[0];
                        char s2 = ftdi->bulk_in_buffer[1];
                        if (s1 == 0x31 && s2 == 0x60) {
                                return 0;
                        } else if (retry_on_status-- > 0) {
                                msleep(5);
                                goto more;
                        } else
                                return -EFAULT;
                } else if (packet_bytes > 0) {
                        char b1 = ftdi->bulk_in_buffer[0];
                        dev_err(&ftdi->udev->dev, "only one byte flushed from F"
                                "TDI = %02X\n", b1);
                        if (retry_on_status-- > 0) {
                                msleep(5);
                                goto more;
                        } else {
                                dev_err(&ftdi->udev->dev, "STATUS ERROR retry l"
                                        "imit reached\n");
                                return -EFAULT;
                        }
                } else if (retval == -ETIMEDOUT) {
                        if (retry_on_timeout-- > 0) {
                                goto more;
                        } else {
                                dev_err(&ftdi->udev->dev, "TIMED OUT retry limi"
                                        "t reached\n");
                                return -ENOMEM;
                        }
                } else if (retval == 0) {
                        if (retry_on_empty-- > 0) {
                                goto more;
                        } else {
                                dev_err(&ftdi->udev->dev, "empty packet retry l"
                                        "imit reached\n");
                                return -ENOMEM;
                        }
                } else {
                        dev_err(&ftdi->udev->dev, "error = %d\n", retval);
                        return -ENOMEM;
                }
        }
        return -1;
}

static int ftdi_elan_checkingPCI(struct usb_ftdi *ftdi)
{
        int UxxxStatus = ftdi_elan_read_reg(ftdi, &ftdi->controlreg);
        if (UxxxStatus)
                return UxxxStatus;
        if (ftdi->controlreg & 0x00400000) {
                if (ftdi->card_ejected) {
                } else {
                        ftdi->card_ejected = 1;
                        dev_err(&ftdi->udev->dev, "CARD EJECTED - controlreg = "
                                "%08X\n", ftdi->controlreg);
                }
                return -ENODEV;
        } else {
                u8 fn = ftdi->function - 1;
                int activePCIfn = fn << 8;
                u32 pcidata;
                u32 pciVID;
                u32 pciPID;
                int reg = 0;
                UxxxStatus = ftdi_elan_read_config(ftdi, activePCIfn | reg, 0,
                        &pcidata);
                if (UxxxStatus)
                        return UxxxStatus;
                pciVID = pcidata & 0xFFFF;
                pciPID = (pcidata >> 16) & 0xFFFF;
                if (pciVID == ftdi->platform_data.vendor && pciPID ==
                        ftdi->platform_data.device) {
                        return 0;
                } else {
                        dev_err(&ftdi->udev->dev, "vendor=%04X pciVID=%04X devi"
                                "ce=%04X pciPID=%04X\n",
                                ftdi->platform_data.vendor, pciVID,
                                ftdi->platform_data.device, pciPID);
                        return -ENODEV;
                }
        }
}

static int ftdi_elan_enumeratePCI(struct usb_ftdi *ftdi)
{
        u32 latence_timer;
        u32 controlreg;
        int UxxxStatus;
        u32 pcidata;
        int reg = 0;
        int foundOHCI = 0;
        u8 fn;
        int activePCIfn = 0;
        u32 pciVID = 0;
        u32 pciPID = 0;
        UxxxStatus = ftdi_elan_read_reg(ftdi, &controlreg);
        if (UxxxStatus)
                return UxxxStatus;
        UxxxStatus = ftdi_elan_write_reg(ftdi, 0x00000000L);
        if (UxxxStatus)
                return UxxxStatus;
        msleep(750);
        UxxxStatus = ftdi_elan_write_reg(ftdi, 0x00000200L | 0x100);
        if (UxxxStatus)
                return UxxxStatus;
        UxxxStatus = ftdi_elan_write_reg(ftdi, 0x00000200L | 0x500);
        if (UxxxStatus)
                return UxxxStatus;
        UxxxStatus = ftdi_elan_read_reg(ftdi, &controlreg);
        if (UxxxStatus)
                return UxxxStatus;
        UxxxStatus = ftdi_elan_write_reg(ftdi, 0x0000020CL | 0x000);
        if (UxxxStatus)
                return UxxxStatus;
        UxxxStatus = ftdi_elan_write_reg(ftdi, 0x0000020DL | 0x000);
        if (UxxxStatus)
                return UxxxStatus;
        msleep(250);
        UxxxStatus = ftdi_elan_write_reg(ftdi, 0x0000020FL | 0x000);
        if (UxxxStatus)
                return UxxxStatus;
        UxxxStatus = ftdi_elan_read_reg(ftdi, &controlreg);
        if (UxxxStatus)
                return UxxxStatus;
        UxxxStatus = ftdi_elan_write_reg(ftdi, 0x0000025FL | 0x800);
        if (UxxxStatus)
                return UxxxStatus;
        UxxxStatus = ftdi_elan_read_reg(ftdi, &controlreg);
        if (UxxxStatus)
                return UxxxStatus;
        UxxxStatus = ftdi_elan_read_reg(ftdi, &controlreg);
        if (UxxxStatus)
                return UxxxStatus;
        msleep(1000);
        for (fn = 0; (fn < 4) && (!foundOHCI); fn++) {
                activePCIfn = fn << 8;
                ftdi->function = fn + 1;
                UxxxStatus = ftdi_elan_read_config(ftdi, activePCIfn | reg, 0,
                        &pcidata);
                if (UxxxStatus)
                        return UxxxStatus;
                pciVID = pcidata & 0xFFFF;
                pciPID = (pcidata >> 16) & 0xFFFF;
                if ((pciVID == 0x1045) && (pciPID == 0xc861)) {
                        foundOHCI = 1;
                } else if ((pciVID == 0x1033) && (pciPID == 0x0035)) {
                        foundOHCI = 1;
                } else if ((pciVID == 0x10b9) && (pciPID == 0x5237)) {
                        foundOHCI = 1;
                } else if ((pciVID == 0x11c1) && (pciPID == 0x5802)) {
                        foundOHCI = 1;
                } else if ((pciVID == 0x11AB) && (pciPID == 0x1FA6)) {
                }
        }
        if (foundOHCI == 0) {
                return -ENXIO;
        }
        ftdi->platform_data.vendor = pciVID;
        ftdi->platform_data.device = pciPID;
        UxxxStatus = ftdi_elan_write_reg(ftdi, 0x0000025FL | 0x2800);
        if (UxxxStatus)
                return UxxxStatus;
        reg = 16;
        UxxxStatus = ftdi_elan_write_config(ftdi, activePCIfn | reg, 0,
                0xFFFFFFFF);
        if (UxxxStatus)
                return UxxxStatus;
        UxxxStatus = ftdi_elan_read_config(ftdi, activePCIfn | reg, 0,
                &pcidata);
        if (UxxxStatus)
                return UxxxStatus;
        UxxxStatus = ftdi_elan_write_config(ftdi, activePCIfn | reg, 0,
                0xF0000000);
        if (UxxxStatus)
                return UxxxStatus;
        UxxxStatus = ftdi_elan_read_config(ftdi, activePCIfn | reg, 0,
                &pcidata);
        if (UxxxStatus)
                return UxxxStatus;
        reg = 12;
        UxxxStatus = ftdi_elan_read_config(ftdi, activePCIfn | reg, 0,
                &latence_timer);
        if (UxxxStatus)
                return UxxxStatus;
        latence_timer &= 0xFFFF00FF;
        latence_timer |= 0x00001600;
        UxxxStatus = ftdi_elan_write_config(ftdi, activePCIfn | reg, 0x00,
                latence_timer);
        if (UxxxStatus)
                return UxxxStatus;
        UxxxStatus = ftdi_elan_read_config(ftdi, activePCIfn | reg, 0,
                &pcidata);
        if (UxxxStatus)
                return UxxxStatus;
        reg = 4;
        UxxxStatus = ftdi_elan_write_config(ftdi, activePCIfn | reg, 0x00,
                0x06);
        if (UxxxStatus)
                return UxxxStatus;
        UxxxStatus = ftdi_elan_read_config(ftdi, activePCIfn | reg, 0,
                &pcidata);
        if (UxxxStatus)
                return UxxxStatus;
        return 0;
}

static int ftdi_elan_setupOHCI(struct usb_ftdi *ftdi)
{
        u32 pcidata;
        int U132Status;
        int reg;
        int reset_repeat = 0;
      do_reset:reg = 8;
        U132Status = ftdi_elan_write_pcimem(ftdi, reg, 0x0e, 0x01);
        if (U132Status)
                return U132Status;
      reset_check:{
                U132Status = ftdi_elan_read_pcimem(ftdi, reg, 0, &pcidata);
                if (U132Status)
                        return U132Status;
                if (pcidata & 1) {
                        msleep(500);
                        if (reset_repeat++ > 100) {
                                reset_repeat = 0;
                                goto do_reset;
                        } else
                                goto reset_check;
                }
        }
        goto dump_regs;
        msleep(500);
        reg = 0x28;
        U132Status = ftdi_elan_write_pcimem(ftdi, reg, 0x00, 0x11000000);
        if (U132Status)
                return U132Status;
        U132Status = ftdi_elan_read_pcimem(ftdi, reg, 0, &pcidata);
        if (U132Status)
                return U132Status;
        reg = 0x40;
        U132Status = ftdi_elan_write_pcimem(ftdi, reg, 0x00, 0x2edf);
        if (U132Status)
                return U132Status;
        U132Status = ftdi_elan_read_pcimem(ftdi, reg, 0, &pcidata);
        if (U132Status)
                return U132Status;
        reg = 0x34;
        U132Status = ftdi_elan_write_pcimem(ftdi, reg, 0x00, 0x2edf2edf);
        if (U132Status)
                return U132Status;
        U132Status = ftdi_elan_read_pcimem(ftdi, reg, 0, &pcidata);
        if (U132Status)
                return U132Status;
        reg = 4;
        U132Status = ftdi_elan_write_pcimem(ftdi, reg, 0x00, 0xA0);
        if (U132Status)
                return U132Status;
        U132Status = ftdi_elan_read_pcimem(ftdi, reg, 0, &pcidata);
        if (U132Status)
                return U132Status;
        msleep(250);
        reg = 8;
        U132Status = ftdi_elan_write_pcimem(ftdi, reg, 0x0e, 0x04);
        if (U132Status)
                return U132Status;
        U132Status = ftdi_elan_read_pcimem(ftdi, reg, 0, &pcidata);
        if (U132Status)
                return U132Status;
        reg = 0x28;
        U132Status = ftdi_elan_read_pcimem(ftdi, reg, 0, &pcidata);
        if (U132Status)
                return U132Status;
        reg = 8;
        U132Status = ftdi_elan_read_pcimem(ftdi, reg, 0, &pcidata);
        if (U132Status)
                return U132Status;
        reg = 0x48;
        U132Status = ftdi_elan_write_pcimem(ftdi, reg, 0x00, 0x00001200);
        if (U132Status)
                return U132Status;
        U132Status = ftdi_elan_read_pcimem(ftdi, reg, 0, &pcidata);
        if (U132Status)
                return U132Status;
        reg = 0x54;
        U132Status = ftdi_elan_read_pcimem(ftdi, reg, 0, &pcidata);
        if (U132Status)
                return U132Status;
        reg = 0x58;
        U132Status = ftdi_elan_read_pcimem(ftdi, reg, 0, &pcidata);
        if (U132Status)
                return U132Status;
        reg = 0x34;
        U132Status = ftdi_elan_write_pcimem(ftdi, reg, 0x00, 0x28002edf);
        if (U132Status)
                return U132Status;
        U132Status = ftdi_elan_read_pcimem(ftdi, reg, 0, &pcidata);
        if (U132Status)
                return U132Status;
        msleep(100);
        reg = 0x50;
        U132Status = ftdi_elan_write_pcimem(ftdi, reg, 0x00, 0x10000);
        if (U132Status)
                return U132Status;
        reg = 0x54;
      power_check:U132Status = ftdi_elan_read_pcimem(ftdi, reg, 0, &pcidata);
        if (U132Status)
                return U132Status;
        if (!(pcidata & 1)) {
                msleep(500);
                goto power_check;
        }
        msleep(3000);
        reg = 0x54;
        U132Status = ftdi_elan_read_pcimem(ftdi, reg, 0, &pcidata);
        if (U132Status)
                return U132Status;
        reg = 0x58;
        U132Status = ftdi_elan_read_pcimem(ftdi, reg, 0, &pcidata);
        if (U132Status)
                return U132Status;
        reg = 0x54;
        U132Status = ftdi_elan_write_pcimem(ftdi, reg, 0x00, 0x02);
        if (U132Status)
                return U132Status;
        U132Status = ftdi_elan_read_pcimem(ftdi, reg, 0, &pcidata);
        if (U132Status)
                return U132Status;
        reg = 0x54;
        U132Status = ftdi_elan_write_pcimem(ftdi, reg, 0x00, 0x10);
        if (U132Status)
                return U132Status;
        U132Status = ftdi_elan_read_pcimem(ftdi, reg, 0, &pcidata);
        if (U132Status)
                return U132Status;
        msleep(750);
        reg = 0x54;
        if (0) {
                U132Status = ftdi_elan_write_pcimem(ftdi, reg, 0x00, 0x02);
                if (U132Status)
                        return U132Status;
        }
        if (0) {
                U132Status = ftdi_elan_read_pcimem(ftdi, reg, 0, &pcidata);
                if (U132Status)
                        return U132Status;
        }
        reg = 0x54;
        U132Status = ftdi_elan_read_pcimem(ftdi, reg, 0, &pcidata);
        if (U132Status)
                return U132Status;
        reg = 0x58;
        U132Status = ftdi_elan_read_pcimem(ftdi, reg, 0, &pcidata);
        if (U132Status)
                return U132Status;
      dump_regs:for (reg = 0; reg <= 0x54; reg += 4) {
                U132Status = ftdi_elan_read_pcimem(ftdi, reg, 0, &pcidata);
                if (U132Status)
                        return U132Status;
        }
        return 0;
}


/*
* we use only the first bulk-in and bulk-out endpoints
*/
static int ftdi_elan_probe(struct usb_interface *interface,
        const struct usb_device_id *id)
{
        struct usb_host_interface *iface_desc;
        struct usb_endpoint_descriptor *endpoint;
        size_t buffer_size;
        int i;
        int retval = -ENOMEM;
        struct usb_ftdi *ftdi = kmalloc(sizeof(struct usb_ftdi), GFP_KERNEL);
        if (ftdi == NULL) {
                printk(KERN_ERR "Out of memory\n");
                return -ENOMEM;
        }
        memset(ftdi, 0x00, sizeof(struct usb_ftdi));
        down(&ftdi_module_lock);
        list_add_tail(&ftdi->ftdi_list, &ftdi_static_list);
        ftdi->sequence_num = ++ftdi_instances;
        up(&ftdi_module_lock);
        ftdi_elan_init_kref(ftdi);
        init_MUTEX(&ftdi->sw_lock);
        ftdi->udev = usb_get_dev(interface_to_usbdev(interface));
        ftdi->interface = interface;
        init_MUTEX(&ftdi->u132_lock);
        ftdi->expected = 4;
        iface_desc = interface->cur_altsetting;
        for (i = 0; i < iface_desc->desc.bNumEndpoints; ++i) {
                endpoint = &iface_desc->endpoint[i].desc;
                if (!ftdi->bulk_in_endpointAddr &&
		    usb_endpoint_is_bulk_in(endpoint)) {
                        buffer_size = le16_to_cpu(endpoint->wMaxPacketSize);
                        ftdi->bulk_in_size = buffer_size;
                        ftdi->bulk_in_endpointAddr = endpoint->bEndpointAddress;
                        ftdi->bulk_in_buffer = kmalloc(buffer_size, GFP_KERNEL);
                        if (!ftdi->bulk_in_buffer) {
                                dev_err(&ftdi->udev->dev, "Could not allocate b"
                                        "ulk_in_buffer\n");
                                retval = -ENOMEM;
                                goto error;
                        }
                }
                if (!ftdi->bulk_out_endpointAddr &&
		    usb_endpoint_is_bulk_out(endpoint)) {
                        ftdi->bulk_out_endpointAddr =
                                endpoint->bEndpointAddress;
                }
        }
        if (!(ftdi->bulk_in_endpointAddr && ftdi->bulk_out_endpointAddr)) {
                dev_err(&ftdi->udev->dev, "Could not find both bulk-in and bulk"
                        "-out endpoints\n");
                retval = -ENODEV;
                goto error;
        }
        dev_info(&ftdi->udev->dev, "interface %d has I=%02X O=%02X\n",
                iface_desc->desc.bInterfaceNumber, ftdi->bulk_in_endpointAddr,
                ftdi->bulk_out_endpointAddr);
        usb_set_intfdata(interface, ftdi);
        if (iface_desc->desc.bInterfaceNumber == 0 &&
                ftdi->bulk_in_endpointAddr == 0x81 &&
                ftdi->bulk_out_endpointAddr == 0x02) {
                retval = usb_register_dev(interface, &ftdi_elan_jtag_class);
                if (retval) {
                        dev_err(&ftdi->udev->dev, "Not able to get a minor for "
                                "this device.\n");
                        usb_set_intfdata(interface, NULL);
                        retval = -ENOMEM;
                        goto error;
                } else {
                        ftdi->class = &ftdi_elan_jtag_class;
                        dev_info(&ftdi->udev->dev, "USB FDTI=%p JTAG interface "
                                "%d now attached to ftdi%d\n", ftdi,
                                iface_desc->desc.bInterfaceNumber,
                                interface->minor);
                        return 0;
                }
        } else if (iface_desc->desc.bInterfaceNumber == 1 &&
                ftdi->bulk_in_endpointAddr == 0x83 &&
                ftdi->bulk_out_endpointAddr == 0x04) {
                ftdi->class = NULL;
                dev_info(&ftdi->udev->dev, "USB FDTI=%p ELAN interface %d now a"
                        "ctivated\n", ftdi, iface_desc->desc.bInterfaceNumber);
                INIT_WORK(&ftdi->status_work, ftdi_elan_status_work,
                        (void *)ftdi);
                INIT_WORK(&ftdi->command_work, ftdi_elan_command_work,
                        (void *)ftdi);
                INIT_WORK(&ftdi->respond_work, ftdi_elan_respond_work,
                        (void *)ftdi);
                ftdi_status_queue_work(ftdi, msecs_to_jiffies(3 *1000));
                return 0;
        } else {
                dev_err(&ftdi->udev->dev,
                        "Could not find ELAN's U132 device\n");
                retval = -ENODEV;
                goto error;
        }
      error:if (ftdi) {
                ftdi_elan_put_kref(ftdi);
        }
        return retval;
}

static void ftdi_elan_disconnect(struct usb_interface *interface)
{
        struct usb_ftdi *ftdi = usb_get_intfdata(interface);
        ftdi->disconnected += 1;
        if (ftdi->class) {
                int minor = interface->minor;
                struct usb_class_driver *class = ftdi->class;
                usb_set_intfdata(interface, NULL);
                usb_deregister_dev(interface, class);
                dev_info(&ftdi->udev->dev, "USB FTDI U132 jtag interface on min"
                        "or %d now disconnected\n", minor);
        } else {
                ftdi_status_cancel_work(ftdi);
                ftdi_command_cancel_work(ftdi);
                ftdi_response_cancel_work(ftdi);
                ftdi_elan_abandon_completions(ftdi);
                ftdi_elan_abandon_targets(ftdi);
                if (ftdi->registered) {
                        platform_device_unregister(&ftdi->platform_dev);
                        ftdi->synchronized = 0;
                        ftdi->enumerated = 0;
                        ftdi->registered = 0;
                }
                flush_workqueue(status_queue);
                flush_workqueue(command_queue);
                flush_workqueue(respond_queue);
                ftdi->disconnected += 1;
                usb_set_intfdata(interface, NULL);
                dev_info(&ftdi->udev->dev, "USB FTDI U132 host controller inter"
                        "face now disconnected\n");
        }
        ftdi_elan_put_kref(ftdi);
}

static struct usb_driver ftdi_elan_driver = {
        .name = "ftdi-elan",
        .probe = ftdi_elan_probe,
        .disconnect = ftdi_elan_disconnect,
        .id_table = ftdi_elan_table,
};
static int __init ftdi_elan_init(void)
{
        int result;
        printk(KERN_INFO "driver %s built at %s on %s\n", ftdi_elan_driver.name,
                 __TIME__, __DATE__);
        init_MUTEX(&ftdi_module_lock);
        INIT_LIST_HEAD(&ftdi_static_list);
        status_queue = create_singlethread_workqueue("ftdi-status-control");
        command_queue = create_singlethread_workqueue("ftdi-command-engine");
        respond_queue = create_singlethread_workqueue("ftdi-respond-engine");
        result = usb_register(&ftdi_elan_driver);
        if (result)
                printk(KERN_ERR "usb_register failed. Error number %d\n",
                        result);
        return result;
}

static void __exit ftdi_elan_exit(void)
{
        struct usb_ftdi *ftdi;
        struct usb_ftdi *temp;
        usb_deregister(&ftdi_elan_driver);
        printk(KERN_INFO "ftdi_u132 driver deregistered\n");
        list_for_each_entry_safe(ftdi, temp, &ftdi_static_list, ftdi_list) {
                ftdi_status_cancel_work(ftdi);
                ftdi_command_cancel_work(ftdi);
                ftdi_response_cancel_work(ftdi);
        } flush_workqueue(status_queue);
        destroy_workqueue(status_queue);
        status_queue = NULL;
        flush_workqueue(command_queue);
        destroy_workqueue(command_queue);
        command_queue = NULL;
        flush_workqueue(respond_queue);
        destroy_workqueue(respond_queue);
        respond_queue = NULL;
}


module_init(ftdi_elan_init);
module_exit(ftdi_elan_exit);