/*
 * USB FTDI SIO driver
 *
 *      Copyright (C) 1999 - 2001
 *          Greg Kroah-Hartman (greg@kroah.com)
 *          Bill Ryder (bryder@sgi.com)
 *      Copyright (C) 2002
 *          Kuba Ober (kuba@mareimbrium.org)
 *
 *      This program is free software; you can redistribute it and/or modify
 *      it under the terms of the GNU General Public License as published by
 *      the Free Software Foundation; either version 2 of the License, or
 *      (at your option) any later version.
 *
 * See Documentation/usb/usb-serial.txt for more information on using this
 * driver
 *
 * See http://ftdi-usb-sio.sourceforge.net for upto date testing info
 *      and extra documentation
 *
 * Change entries from 2004 and earlier can be found in versions of this
 * file in kernel versions prior to the 2.6.24 release.
 *
 */

/* Bill Ryder - bryder@sgi.com - wrote the FTDI_SIO implementation */
/* Thanx to FTDI for so kindly providing details of the protocol required */
/*   to talk to the device */
/* Thanx to gkh and the rest of the usb dev group for all code I have
   assimilated :-) */

#include <linux/kernel.h>
#include <linux/errno.h>
#include <linux/init.h>
#include <linux/slab.h>
#include <linux/tty.h>
#include <linux/tty_driver.h>
#include <linux/tty_flip.h>
#include <linux/module.h>
#include <linux/spinlock.h>
#include <linux/mutex.h>
#include <linux/uaccess.h>
#include <linux/usb.h>
#include <linux/serial.h>
#include <linux/usb/serial.h>
#include "ftdi_sio.h"
#include "ftdi_sio_ids.h"

/*
 * Version Information
 */
#define DRIVER_VERSION "v1.5.0"
#define DRIVER_AUTHOR "Greg Kroah-Hartman <greg@kroah.com>, Bill Ryder <bryder@sgi.com>, Kuba Ober <kuba@mareimbrium.org>, Andreas Mohr"
#define DRIVER_DESC "USB FTDI Serial Converters Driver"

static int debug;
static __u16 vendor = FTDI_VID;
static __u16 product;

struct ftdi_private {
        struct kref kref;
        ftdi_chip_type_t chip_type;
                                /* type of device, either SIO or FT8U232AM */
        int baud_base;          /* baud base clock for divisor setting */
        int custom_divisor;     /* custom_divisor kludge, this is for
                                   baud_base (different from what goes to the
                                   chip!) */
        __u16 last_set_data_urb_value ;
                                /* the last data state set - needed for doing
                                 * a break
                                 */
        int write_offset;       /* This is the offset in the usb data block to
                                 * write the serial data - it varies between
                                 * devices
                                 */
        int flags;              /* some ASYNC_xxxx flags are supported */
        unsigned long last_dtr_rts;     /* saved modem control outputs */
        wait_queue_head_t delta_msr_wait; /* Used for TIOCMIWAIT */
        char prev_status, diff_status;        /* Used for TIOCMIWAIT */
        struct usb_serial_port *port;
        __u16 interface;        /* FT2232C, FT2232H or FT4232H port interface
                                   (0 for FT232/245) */

        speed_t force_baud;     /* if non-zero, force the baud rate to
                                   this value */
        int force_rtscts;       /* if non-zero, force RTS-CTS to always
                                   be enabled */

        unsigned int latency;           /* latency setting in use */
        spinlock_t tx_lock;     /* spinlock for transmit state */
        unsigned long tx_outstanding_bytes;
        unsigned long tx_outstanding_urbs;
        unsigned short max_packet_size;
        struct mutex cfg_lock; /* Avoid mess by parallel calls of config ioctl() and change_speed() */
};

/* struct ftdi_sio_quirk is used by devices requiring special attention. */
struct ftdi_sio_quirk {
        int (*probe)(struct usb_serial *);
        /* Special settings for probed ports. */
        void (*port_probe)(struct ftdi_private *);
};

static int   ftdi_jtag_probe(struct usb_serial *serial);
static int   ftdi_mtxorb_hack_setup(struct usb_serial *serial);
static int   ftdi_NDI_device_setup(struct usb_serial *serial);
static void  ftdi_USB_UIRT_setup(struct ftdi_private *priv);
static void  ftdi_HE_TIRA1_setup(struct ftdi_private *priv);

static struct ftdi_sio_quirk ftdi_jtag_quirk = {
        .probe  = ftdi_jtag_probe,
};

static struct ftdi_sio_quirk ftdi_mtxorb_hack_quirk = {
        .probe  = ftdi_mtxorb_hack_setup,
};

static struct ftdi_sio_quirk ftdi_NDI_device_quirk = {
        .probe  = ftdi_NDI_device_setup,
};

static struct ftdi_sio_quirk ftdi_USB_UIRT_quirk = {
        .port_probe = ftdi_USB_UIRT_setup,
};

static struct ftdi_sio_quirk ftdi_HE_TIRA1_quirk = {
        .port_probe = ftdi_HE_TIRA1_setup,
};

/*
 * The 8U232AM has the same API as the sio except for:
 * - it can support MUCH higher baudrates; up to:
 *   o 921600 for RS232 and 2000000 for RS422/485 at 48MHz
 *   o 230400 at 12MHz
 *   so .. 8U232AM's baudrate setting codes are different
 * - it has a two byte status code.
 * - it returns characters every 16ms (the FTDI does it every 40ms)
 *
 * the bcdDevice value is used to differentiate FT232BM and FT245BM from
 * the earlier FT8U232AM and FT8U232BM.  For now, include all known VID/PID
 * combinations in both tables.
 * FIXME: perhaps bcdDevice can also identify 12MHz FT8U232AM devices,
 * but I don't know if those ever went into mass production. [Ian Abbott]
 */



/*
 * Device ID not listed? Test via module params product/vendor or
 * /sys/bus/usb/ftdi_sio/new_id, then send patch/report!
 */
static struct usb_device_id id_table_combined [] = {
        { USB_DEVICE(FTDI_VID, FTDI_AMC232_PID) },
        { USB_DEVICE(FTDI_VID, FTDI_CANUSB_PID) },
        { USB_DEVICE(FTDI_VID, FTDI_CANDAPTER_PID) },
        { USB_DEVICE(FTDI_VID, FTDI_NXTCAM_PID) },
        { USB_DEVICE(FTDI_VID, FTDI_SCS_DEVICE_0_PID) },
        { USB_DEVICE(FTDI_VID, FTDI_SCS_DEVICE_1_PID) },
        { USB_DEVICE(FTDI_VID, FTDI_SCS_DEVICE_2_PID) },
        { USB_DEVICE(FTDI_VID, FTDI_SCS_DEVICE_3_PID) },
        { USB_DEVICE(FTDI_VID, FTDI_SCS_DEVICE_4_PID) },
        { USB_DEVICE(FTDI_VID, FTDI_SCS_DEVICE_5_PID) },
        { USB_DEVICE(FTDI_VID, FTDI_SCS_DEVICE_6_PID) },
        { USB_DEVICE(FTDI_VID, FTDI_SCS_DEVICE_7_PID) },
        { USB_DEVICE(FTDI_VID, FTDI_ACTZWAVE_PID) },
        { USB_DEVICE(FTDI_VID, FTDI_IRTRANS_PID) },
        { USB_DEVICE(FTDI_VID, FTDI_IPLUS_PID) },
        { USB_DEVICE(FTDI_VID, FTDI_IPLUS2_PID) },
        { USB_DEVICE(FTDI_VID, FTDI_DMX4ALL) },
        { USB_DEVICE(FTDI_VID, FTDI_SIO_PID) },
        { USB_DEVICE(FTDI_VID, FTDI_8U232AM_PID) },
        { USB_DEVICE(FTDI_VID, FTDI_8U232AM_ALT_PID) },
        { USB_DEVICE(FTDI_VID, FTDI_232RL_PID) },
        { USB_DEVICE(FTDI_VID, FTDI_8U2232C_PID) },
        { USB_DEVICE(FTDI_VID, FTDI_4232H_PID) },
        { USB_DEVICE(FTDI_VID, FTDI_MICRO_CHAMELEON_PID) },
        { USB_DEVICE(FTDI_VID, FTDI_RELAIS_PID) },
        { USB_DEVICE(FTDI_VID, FTDI_OPENDCC_PID) },
        { USB_DEVICE(FTDI_VID, FTDI_OPENDCC_SNIFFER_PID) },
        { USB_DEVICE(FTDI_VID, FTDI_OPENDCC_THROTTLE_PID) },
        { USB_DEVICE(FTDI_VID, FTDI_OPENDCC_GATEWAY_PID) },
        { USB_DEVICE(INTERBIOMETRICS_VID, INTERBIOMETRICS_IOBOARD_PID) },
        { USB_DEVICE(INTERBIOMETRICS_VID, INTERBIOMETRICS_MINI_IOBOARD_PID) },
        { USB_DEVICE(FTDI_VID, FTDI_SPROG_II) },
        { USB_DEVICE(FTDI_VID, FTDI_XF_632_PID) },
        { USB_DEVICE(FTDI_VID, FTDI_XF_634_PID) },
        { USB_DEVICE(FTDI_VID, FTDI_XF_547_PID) },
        { USB_DEVICE(FTDI_VID, FTDI_XF_633_PID) },
        { USB_DEVICE(FTDI_VID, FTDI_XF_631_PID) },
        { USB_DEVICE(FTDI_VID, FTDI_XF_635_PID) },
        { USB_DEVICE(FTDI_VID, FTDI_XF_640_PID) },
        { USB_DEVICE(FTDI_VID, FTDI_XF_642_PID) },
        { USB_DEVICE(FTDI_VID, FTDI_DSS20_PID) },
        { USB_DEVICE(FTDI_NF_RIC_VID, FTDI_NF_RIC_PID) },
        { USB_DEVICE(FTDI_VID, FTDI_VNHCPCUSB_D_PID) },
        { USB_DEVICE(FTDI_VID, FTDI_MTXORB_0_PID) },
        { USB_DEVICE(FTDI_VID, FTDI_MTXORB_1_PID) },
        { USB_DEVICE(FTDI_VID, FTDI_MTXORB_2_PID) },
        { USB_DEVICE(FTDI_VID, FTDI_MTXORB_3_PID) },
        { USB_DEVICE(FTDI_VID, FTDI_MTXORB_4_PID) },
        { USB_DEVICE(FTDI_VID, FTDI_MTXORB_5_PID) },
        { USB_DEVICE(FTDI_VID, FTDI_MTXORB_6_PID) },
        { USB_DEVICE(FTDI_VID, FTDI_R2000KU_TRUE_RNG) },
        { USB_DEVICE(MTXORB_VID, MTXORB_FTDI_RANGE_0100_PID) },
        { USB_DEVICE(MTXORB_VID, MTXORB_FTDI_RANGE_0101_PID) },
        { USB_DEVICE(MTXORB_VID, MTXORB_FTDI_RANGE_0102_PID) },
        { USB_DEVICE(MTXORB_VID, MTXORB_FTDI_RANGE_0103_PID) },
        { USB_DEVICE(MTXORB_VID, MTXORB_FTDI_RANGE_0104_PID) },
        { USB_DEVICE(MTXORB_VID, MTXORB_FTDI_RANGE_0105_PID) },
        { USB_DEVICE(MTXORB_VID, MTXORB_FTDI_RANGE_0106_PID) },
        { USB_DEVICE(MTXORB_VID, MTXORB_FTDI_RANGE_0107_PID) },
        { USB_DEVICE(MTXORB_VID, MTXORB_FTDI_RANGE_0108_PID) },
        { USB_DEVICE(MTXORB_VID, MTXORB_FTDI_RANGE_0109_PID) },
        { USB_DEVICE(MTXORB_VID, MTXORB_FTDI_RANGE_010A_PID) },
        { USB_DEVICE(MTXORB_VID, MTXORB_FTDI_RANGE_010B_PID) },
        { USB_DEVICE(MTXORB_VID, MTXORB_FTDI_RANGE_010C_PID) },
        { USB_DEVICE(MTXORB_VID, MTXORB_FTDI_RANGE_010D_PID) },
        { USB_DEVICE(MTXORB_VID, MTXORB_FTDI_RANGE_010E_PID) },
        { USB_DEVICE(MTXORB_VID, MTXORB_FTDI_RANGE_010F_PID) },
        { USB_DEVICE(MTXORB_VID, MTXORB_FTDI_RANGE_0110_PID) },
        { USB_DEVICE(MTXORB_VID, MTXORB_FTDI_RANGE_0111_PID) },
        { USB_DEVICE(MTXORB_VID, MTXORB_FTDI_RANGE_0112_PID) },
        { USB_DEVICE(MTXORB_VID, MTXORB_FTDI_RANGE_0113_PID) },
        { USB_DEVICE(MTXORB_VID, MTXORB_FTDI_RANGE_0114_PID) },
        { USB_DEVICE(MTXORB_VID, MTXORB_FTDI_RANGE_0115_PID) },
        { USB_DEVICE(MTXORB_VID, MTXORB_FTDI_RANGE_0116_PID) },
        { USB_DEVICE(MTXORB_VID, MTXORB_FTDI_RANGE_0117_PID) },
        { USB_DEVICE(MTXORB_VID, MTXORB_FTDI_RANGE_0118_PID) },
        { USB_DEVICE(MTXORB_VID, MTXORB_FTDI_RANGE_0119_PID) },
        { USB_DEVICE(MTXORB_VID, MTXORB_FTDI_RANGE_011A_PID) },
        { USB_DEVICE(MTXORB_VID, MTXORB_FTDI_RANGE_011B_PID) },
        { USB_DEVICE(MTXORB_VID, MTXORB_FTDI_RANGE_011C_PID) },
        { USB_DEVICE(MTXORB_VID, MTXORB_FTDI_RANGE_011D_PID) },
        { USB_DEVICE(MTXORB_VID, MTXORB_FTDI_RANGE_011E_PID) },
        { USB_DEVICE(MTXORB_VID, MTXORB_FTDI_RANGE_011F_PID) },
        { USB_DEVICE(MTXORB_VID, MTXORB_FTDI_RANGE_0120_PID) },
        { USB_DEVICE(MTXORB_VID, MTXORB_FTDI_RANGE_0121_PID) },
        { USB_DEVICE(MTXORB_VID, MTXORB_FTDI_RANGE_0122_PID) },
        { USB_DEVICE(MTXORB_VID, MTXORB_FTDI_RANGE_0123_PID) },
        { USB_DEVICE(MTXORB_VID, MTXORB_FTDI_RANGE_0124_PID) },
        { USB_DEVICE(MTXORB_VID, MTXORB_FTDI_RANGE_0125_PID) },
        { USB_DEVICE(MTXORB_VID, MTXORB_FTDI_RANGE_0126_PID) },
        { USB_DEVICE(MTXORB_VID, MTXORB_FTDI_RANGE_0127_PID),
                .driver_info = (kernel_ulong_t)&ftdi_mtxorb_hack_quirk },
        { USB_DEVICE(MTXORB_VID, MTXORB_FTDI_RANGE_0128_PID) },
        { USB_DEVICE(MTXORB_VID, MTXORB_FTDI_RANGE_0129_PID) },
        { USB_DEVICE(MTXORB_VID, MTXORB_FTDI_RANGE_012A_PID) },
        { USB_DEVICE(MTXORB_VID, MTXORB_FTDI_RANGE_012B_PID) },
        { USB_DEVICE(MTXORB_VID, MTXORB_FTDI_RANGE_012C_PID),
                .driver_info = (kernel_ulong_t)&ftdi_mtxorb_hack_quirk },
        { USB_DEVICE(MTXORB_VID, MTXORB_FTDI_RANGE_012D_PID) },
        { USB_DEVICE(MTXORB_VID, MTXORB_FTDI_RANGE_012E_PID) },
        { USB_DEVICE(MTXORB_VID, MTXORB_FTDI_RANGE_012F_PID) },
        { USB_DEVICE(MTXORB_VID, MTXORB_FTDI_RANGE_0130_PID) },
        { USB_DEVICE(MTXORB_VID, MTXORB_FTDI_RANGE_0131_PID) },
        { USB_DEVICE(MTXORB_VID, MTXORB_FTDI_RANGE_0132_PID) },
        { USB_DEVICE(MTXORB_VID, MTXORB_FTDI_RANGE_0133_PID) },
        { USB_DEVICE(MTXORB_VID, MTXORB_FTDI_RANGE_0134_PID) },
        { USB_DEVICE(MTXORB_VID, MTXORB_FTDI_RANGE_0135_PID) },
        { USB_DEVICE(MTXORB_VID, MTXORB_FTDI_RANGE_0136_PID) },
        { USB_DEVICE(MTXORB_VID, MTXORB_FTDI_RANGE_0137_PID) },
        { USB_DEVICE(MTXORB_VID, MTXORB_FTDI_RANGE_0138_PID) },
        { USB_DEVICE(MTXORB_VID, MTXORB_FTDI_RANGE_0139_PID) },
        { USB_DEVICE(MTXORB_VID, MTXORB_FTDI_RANGE_013A_PID) },
        { USB_DEVICE(MTXORB_VID, MTXORB_FTDI_RANGE_013B_PID) },
        { USB_DEVICE(MTXORB_VID, MTXORB_FTDI_RANGE_013C_PID) },
        { USB_DEVICE(MTXORB_VID, MTXORB_FTDI_RANGE_013D_PID) },
        { USB_DEVICE(MTXORB_VID, MTXORB_FTDI_RANGE_013E_PID) },
        { USB_DEVICE(MTXORB_VID, MTXORB_FTDI_RANGE_013F_PID) },
        { USB_DEVICE(MTXORB_VID, MTXORB_FTDI_RANGE_0140_PID) },
        { USB_DEVICE(MTXORB_VID, MTXORB_FTDI_RANGE_0141_PID) },
        { USB_DEVICE(MTXORB_VID, MTXORB_FTDI_RANGE_0142_PID) },
        { USB_DEVICE(MTXORB_VID, MTXORB_FTDI_RANGE_0143_PID) },
        { USB_DEVICE(MTXORB_VID, MTXORB_FTDI_RANGE_0144_PID) },
        { USB_DEVICE(MTXORB_VID, MTXORB_FTDI_RANGE_0145_PID) },
        { USB_DEVICE(MTXORB_VID, MTXORB_FTDI_RANGE_0146_PID) },
        { USB_DEVICE(MTXORB_VID, MTXORB_FTDI_RANGE_0147_PID) },
        { USB_DEVICE(MTXORB_VID, MTXORB_FTDI_RANGE_0148_PID) },
        { USB_DEVICE(MTXORB_VID, MTXORB_FTDI_RANGE_0149_PID) },
        { USB_DEVICE(MTXORB_VID, MTXORB_FTDI_RANGE_014A_PID) },
        { USB_DEVICE(MTXORB_VID, MTXORB_FTDI_RANGE_014B_PID) },
        { USB_DEVICE(MTXORB_VID, MTXORB_FTDI_RANGE_014C_PID) },
        { USB_DEVICE(MTXORB_VID, MTXORB_FTDI_RANGE_014D_PID) },
        { USB_DEVICE(MTXORB_VID, MTXORB_FTDI_RANGE_014E_PID) },
        { USB_DEVICE(MTXORB_VID, MTXORB_FTDI_RANGE_014F_PID) },
        { USB_DEVICE(MTXORB_VID, MTXORB_FTDI_RANGE_0150_PID) },
        { USB_DEVICE(MTXORB_VID, MTXORB_FTDI_RANGE_0151_PID) },
        { USB_DEVICE(MTXORB_VID, MTXORB_FTDI_RANGE_0152_PID) },
        { USB_DEVICE(MTXORB_VID, MTXORB_FTDI_RANGE_0153_PID),
                .driver_info = (kernel_ulong_t)&ftdi_mtxorb_hack_quirk },
        { USB_DEVICE(MTXORB_VID, MTXORB_FTDI_RANGE_0154_PID),
                .driver_info = (kernel_ulong_t)&ftdi_mtxorb_hack_quirk },
        { USB_DEVICE(MTXORB_VID, MTXORB_FTDI_RANGE_0155_PID),
                .driver_info = (kernel_ulong_t)&ftdi_mtxorb_hack_quirk },
        { USB_DEVICE(MTXORB_VID, MTXORB_FTDI_RANGE_0156_PID),
                .driver_info = (kernel_ulong_t)&ftdi_mtxorb_hack_quirk },
        { USB_DEVICE(MTXORB_VID, MTXORB_FTDI_RANGE_0157_PID),
                .driver_info = (kernel_ulong_t)&ftdi_mtxorb_hack_quirk },
        { USB_DEVICE(MTXORB_VID, MTXORB_FTDI_RANGE_0158_PID),
                .driver_info = (kernel_ulong_t)&ftdi_mtxorb_hack_quirk },
        { USB_DEVICE(MTXORB_VID, MTXORB_FTDI_RANGE_0159_PID) },
        { USB_DEVICE(MTXORB_VID, MTXORB_FTDI_RANGE_015A_PID) },
        { USB_DEVICE(MTXORB_VID, MTXORB_FTDI_RANGE_015B_PID) },
        { USB_DEVICE(MTXORB_VID, MTXORB_FTDI_RANGE_015C_PID) },
        { USB_DEVICE(MTXORB_VID, MTXORB_FTDI_RANGE_015D_PID) },
        { USB_DEVICE(MTXORB_VID, MTXORB_FTDI_RANGE_015E_PID) },
        { USB_DEVICE(MTXORB_VID, MTXORB_FTDI_RANGE_015F_PID) },
        { USB_DEVICE(MTXORB_VID, MTXORB_FTDI_RANGE_0160_PID) },
        { USB_DEVICE(MTXORB_VID, MTXORB_FTDI_RANGE_0161_PID) },
        { USB_DEVICE(MTXORB_VID, MTXORB_FTDI_RANGE_0162_PID) },
        { USB_DEVICE(MTXORB_VID, MTXORB_FTDI_RANGE_0163_PID) },
        { USB_DEVICE(MTXORB_VID, MTXORB_FTDI_RANGE_0164_PID) },
        { USB_DEVICE(MTXORB_VID, MTXORB_FTDI_RANGE_0165_PID) },
        { USB_DEVICE(MTXORB_VID, MTXORB_FTDI_RANGE_0166_PID) },
        { USB_DEVICE(MTXORB_VID, MTXORB_FTDI_RANGE_0167_PID) },
        { USB_DEVICE(MTXORB_VID, MTXORB_FTDI_RANGE_0168_PID) },
        { USB_DEVICE(MTXORB_VID, MTXORB_FTDI_RANGE_0169_PID) },
        { USB_DEVICE(MTXORB_VID, MTXORB_FTDI_RANGE_016A_PID) },
        { USB_DEVICE(MTXORB_VID, MTXORB_FTDI_RANGE_016B_PID) },
        { USB_DEVICE(MTXORB_VID, MTXORB_FTDI_RANGE_016C_PID) },
        { USB_DEVICE(MTXORB_VID, MTXORB_FTDI_RANGE_016D_PID) },
        { USB_DEVICE(MTXORB_VID, MTXORB_FTDI_RANGE_016E_PID) },
        { USB_DEVICE(MTXORB_VID, MTXORB_FTDI_RANGE_016F_PID) },
        { USB_DEVICE(MTXORB_VID, MTXORB_FTDI_RANGE_0170_PID) },
        { USB_DEVICE(MTXORB_VID, MTXORB_FTDI_RANGE_0171_PID) },
        { USB_DEVICE(MTXORB_VID, MTXORB_FTDI_RANGE_0172_PID) },
        { USB_DEVICE(MTXORB_VID, MTXORB_FTDI_RANGE_0173_PID) },
        { USB_DEVICE(MTXORB_VID, MTXORB_FTDI_RANGE_0174_PID) },
        { USB_DEVICE(MTXORB_VID, MTXORB_FTDI_RANGE_0175_PID) },
        { USB_DEVICE(MTXORB_VID, MTXORB_FTDI_RANGE_0176_PID) },
        { USB_DEVICE(MTXORB_VID, MTXORB_FTDI_RANGE_0177_PID) },
        { USB_DEVICE(MTXORB_VID, MTXORB_FTDI_RANGE_0178_PID) },
        { USB_DEVICE(MTXORB_VID, MTXORB_FTDI_RANGE_0179_PID) },
        { USB_DEVICE(MTXORB_VID, MTXORB_FTDI_RANGE_017A_PID) },
        { USB_DEVICE(MTXORB_VID, MTXORB_FTDI_RANGE_017B_PID) },
        { USB_DEVICE(MTXORB_VID, MTXORB_FTDI_RANGE_017C_PID) },
        { USB_DEVICE(MTXORB_VID, MTXORB_FTDI_RANGE_017D_PID) },
        { USB_DEVICE(MTXORB_VID, MTXORB_FTDI_RANGE_017E_PID) },
        { USB_DEVICE(MTXORB_VID, MTXORB_FTDI_RANGE_017F_PID) },
        { USB_DEVICE(MTXORB_VID, MTXORB_FTDI_RANGE_0180_PID) },
        { USB_DEVICE(MTXORB_VID, MTXORB_FTDI_RANGE_0181_PID) },
        { USB_DEVICE(MTXORB_VID, MTXORB_FTDI_RANGE_0182_PID) },
        { USB_DEVICE(MTXORB_VID, MTXORB_FTDI_RANGE_0183_PID) },
        { USB_DEVICE(MTXORB_VID, MTXORB_FTDI_RANGE_0184_PID) },
        { USB_DEVICE(MTXORB_VID, MTXORB_FTDI_RANGE_0185_PID) },
        { USB_DEVICE(MTXORB_VID, MTXORB_FTDI_RANGE_0186_PID) },
        { USB_DEVICE(MTXORB_VID, MTXORB_FTDI_RANGE_0187_PID) },
        { USB_DEVICE(MTXORB_VID, MTXORB_FTDI_RANGE_0188_PID) },
        { USB_DEVICE(MTXORB_VID, MTXORB_FTDI_RANGE_0189_PID) },
        { USB_DEVICE(MTXORB_VID, MTXORB_FTDI_RANGE_018A_PID) },
        { USB_DEVICE(MTXORB_VID, MTXORB_FTDI_RANGE_018B_PID) },
        { USB_DEVICE(MTXORB_VID, MTXORB_FTDI_RANGE_018C_PID) },
        { USB_DEVICE(MTXORB_VID, MTXORB_FTDI_RANGE_018D_PID) },
        { USB_DEVICE(MTXORB_VID, MTXORB_FTDI_RANGE_018E_PID) },
        { USB_DEVICE(MTXORB_VID, MTXORB_FTDI_RANGE_018F_PID) },
        { USB_DEVICE(MTXORB_VID, MTXORB_FTDI_RANGE_0190_PID) },
        { USB_DEVICE(MTXORB_VID, MTXORB_FTDI_RANGE_0191_PID) },
        { USB_DEVICE(MTXORB_VID, MTXORB_FTDI_RANGE_0192_PID) },
        { USB_DEVICE(MTXORB_VID, MTXORB_FTDI_RANGE_0193_PID) },
        { USB_DEVICE(MTXORB_VID, MTXORB_FTDI_RANGE_0194_PID) },
        { USB_DEVICE(MTXORB_VID, MTXORB_FTDI_RANGE_0195_PID) },
        { USB_DEVICE(MTXORB_VID, MTXORB_FTDI_RANGE_0196_PID) },
        { USB_DEVICE(MTXORB_VID, MTXORB_FTDI_RANGE_0197_PID) },
        { USB_DEVICE(MTXORB_VID, MTXORB_FTDI_RANGE_0198_PID) },
        { USB_DEVICE(MTXORB_VID, MTXORB_FTDI_RANGE_0199_PID) },
        { USB_DEVICE(MTXORB_VID, MTXORB_FTDI_RANGE_019A_PID) },
        { USB_DEVICE(MTXORB_VID, MTXORB_FTDI_RANGE_019B_PID) },
        { USB_DEVICE(MTXORB_VID, MTXORB_FTDI_RANGE_019C_PID) },
        { USB_DEVICE(MTXORB_VID, MTXORB_FTDI_RANGE_019D_PID) },
        { USB_DEVICE(MTXORB_VID, MTXORB_FTDI_RANGE_019E_PID) },
        { USB_DEVICE(MTXORB_VID, MTXORB_FTDI_RANGE_019F_PID) },
        { USB_DEVICE(MTXORB_VID, MTXORB_FTDI_RANGE_01A0_PID) },
        { USB_DEVICE(MTXORB_VID, MTXORB_FTDI_RANGE_01A1_PID) },
        { USB_DEVICE(MTXORB_VID, MTXORB_FTDI_RANGE_01A2_PID) },
        { USB_DEVICE(MTXORB_VID, MTXORB_FTDI_RANGE_01A3_PID) },
        { USB_DEVICE(MTXORB_VID, MTXORB_FTDI_RANGE_01A4_PID) },
        { USB_DEVICE(MTXORB_VID, MTXORB_FTDI_RANGE_01A5_PID) },
        { USB_DEVICE(MTXORB_VID, MTXORB_FTDI_RANGE_01A6_PID) },
        { USB_DEVICE(MTXORB_VID, MTXORB_FTDI_RANGE_01A7_PID) },
        { USB_DEVICE(MTXORB_VID, MTXORB_FTDI_RANGE_01A8_PID) },
        { USB_DEVICE(MTXORB_VID, MTXORB_FTDI_RANGE_01A9_PID) },
        { USB_DEVICE(MTXORB_VID, MTXORB_FTDI_RANGE_01AA_PID) },
        { USB_DEVICE(MTXORB_VID, MTXORB_FTDI_RANGE_01AB_PID) },
        { USB_DEVICE(MTXORB_VID, MTXORB_FTDI_RANGE_01AC_PID) },
        { USB_DEVICE(MTXORB_VID, MTXORB_FTDI_RANGE_01AD_PID) },
        { USB_DEVICE(MTXORB_VID, MTXORB_FTDI_RANGE_01AE_PID) },
        { USB_DEVICE(MTXORB_VID, MTXORB_FTDI_RANGE_01AF_PID) },
        { USB_DEVICE(MTXORB_VID, MTXORB_FTDI_RANGE_01B0_PID) },
        { USB_DEVICE(MTXORB_VID, MTXORB_FTDI_RANGE_01B1_PID) },
        { USB_DEVICE(MTXORB_VID, MTXORB_FTDI_RANGE_01B2_PID) },
        { USB_DEVICE(MTXORB_VID, MTXORB_FTDI_RANGE_01B3_PID) },
        { USB_DEVICE(MTXORB_VID, MTXORB_FTDI_RANGE_01B4_PID) },
        { USB_DEVICE(MTXORB_VID, MTXORB_FTDI_RANGE_01B5_PID) },
        { USB_DEVICE(MTXORB_VID, MTXORB_FTDI_RANGE_01B6_PID) },
        { USB_DEVICE(MTXORB_VID, MTXORB_FTDI_RANGE_01B7_PID) },
        { USB_DEVICE(MTXORB_VID, MTXORB_FTDI_RANGE_01B8_PID) },
        { USB_DEVICE(MTXORB_VID, MTXORB_FTDI_RANGE_01B9_PID) },
        { USB_DEVICE(MTXORB_VID, MTXORB_FTDI_RANGE_01BA_PID) },
        { USB_DEVICE(MTXORB_VID, MTXORB_FTDI_RANGE_01BB_PID) },
        { USB_DEVICE(MTXORB_VID, MTXORB_FTDI_RANGE_01BC_PID) },
        { USB_DEVICE(MTXORB_VID, MTXORB_FTDI_RANGE_01BD_PID) },
        { USB_DEVICE(MTXORB_VID, MTXORB_FTDI_RANGE_01BE_PID) },
        { USB_DEVICE(MTXORB_VID, MTXORB_FTDI_RANGE_01BF_PID) },
        { USB_DEVICE(MTXORB_VID, MTXORB_FTDI_RANGE_01C0_PID) },
        { USB_DEVICE(MTXORB_VID, MTXORB_FTDI_RANGE_01C1_PID) },
        { USB_DEVICE(MTXORB_VID, MTXORB_FTDI_RANGE_01C2_PID) },
        { USB_DEVICE(MTXORB_VID, MTXORB_FTDI_RANGE_01C3_PID) },
        { USB_DEVICE(MTXORB_VID, MTXORB_FTDI_RANGE_01C4_PID) },
        { USB_DEVICE(MTXORB_VID, MTXORB_FTDI_RANGE_01C5_PID) },
        { USB_DEVICE(MTXORB_VID, MTXORB_FTDI_RANGE_01C6_PID) },
        { USB_DEVICE(MTXORB_VID, MTXORB_FTDI_RANGE_01C7_PID) },
        { USB_DEVICE(MTXORB_VID, MTXORB_FTDI_RANGE_01C8_PID) },
        { USB_DEVICE(MTXORB_VID, MTXORB_FTDI_RANGE_01C9_PID) },
        { USB_DEVICE(MTXORB_VID, MTXORB_FTDI_RANGE_01CA_PID) },
        { USB_DEVICE(MTXORB_VID, MTXORB_FTDI_RANGE_01CB_PID) },
        { USB_DEVICE(MTXORB_VID, MTXORB_FTDI_RANGE_01CC_PID) },
        { USB_DEVICE(MTXORB_VID, MTXORB_FTDI_RANGE_01CD_PID) },
        { USB_DEVICE(MTXORB_VID, MTXORB_FTDI_RANGE_01CE_PID) },
        { USB_DEVICE(MTXORB_VID, MTXORB_FTDI_RANGE_01CF_PID) },
        { USB_DEVICE(MTXORB_VID, MTXORB_FTDI_RANGE_01D0_PID) },
        { USB_DEVICE(MTXORB_VID, MTXORB_FTDI_RANGE_01D1_PID) },
        { USB_DEVICE(MTXORB_VID, MTXORB_FTDI_RANGE_01D2_PID) },
        { USB_DEVICE(MTXORB_VID, MTXORB_FTDI_RANGE_01D3_PID) },
        { USB_DEVICE(MTXORB_VID, MTXORB_FTDI_RANGE_01D4_PID) },
        { USB_DEVICE(MTXORB_VID, MTXORB_FTDI_RANGE_01D5_PID) },
        { USB_DEVICE(MTXORB_VID, MTXORB_FTDI_RANGE_01D6_PID) },
        { USB_DEVICE(MTXORB_VID, MTXORB_FTDI_RANGE_01D7_PID) },
        { USB_DEVICE(MTXORB_VID, MTXORB_FTDI_RANGE_01D8_PID) },
        { USB_DEVICE(MTXORB_VID, MTXORB_FTDI_RANGE_01D9_PID) },
        { USB_DEVICE(MTXORB_VID, MTXORB_FTDI_RANGE_01DA_PID) },
        { USB_DEVICE(MTXORB_VID, MTXORB_FTDI_RANGE_01DB_PID) },
        { USB_DEVICE(MTXORB_VID, MTXORB_FTDI_RANGE_01DC_PID) },
        { USB_DEVICE(MTXORB_VID, MTXORB_FTDI_RANGE_01DD_PID) },
        { USB_DEVICE(MTXORB_VID, MTXORB_FTDI_RANGE_01DE_PID) },
        { USB_DEVICE(MTXORB_VID, MTXORB_FTDI_RANGE_01DF_PID) },
        { USB_DEVICE(MTXORB_VID, MTXORB_FTDI_RANGE_01E0_PID) },
        { USB_DEVICE(MTXORB_VID, MTXORB_FTDI_RANGE_01E1_PID) },
        { USB_DEVICE(MTXORB_VID, MTXORB_FTDI_RANGE_01E2_PID) },
        { USB_DEVICE(MTXORB_VID, MTXORB_FTDI_RANGE_01E3_PID) },
        { USB_DEVICE(MTXORB_VID, MTXORB_FTDI_RANGE_01E4_PID) },
        { USB_DEVICE(MTXORB_VID, MTXORB_FTDI_RANGE_01E5_PID) },
        { USB_DEVICE(MTXORB_VID, MTXORB_FTDI_RANGE_01E6_PID) },
        { USB_DEVICE(MTXORB_VID, MTXORB_FTDI_RANGE_01E7_PID) },
        { USB_DEVICE(MTXORB_VID, MTXORB_FTDI_RANGE_01E8_PID) },
        { USB_DEVICE(MTXORB_VID, MTXORB_FTDI_RANGE_01E9_PID) },
        { USB_DEVICE(MTXORB_VID, MTXORB_FTDI_RANGE_01EA_PID) },
        { USB_DEVICE(MTXORB_VID, MTXORB_FTDI_RANGE_01EB_PID) },
        { USB_DEVICE(MTXORB_VID, MTXORB_FTDI_RANGE_01EC_PID) },
        { USB_DEVICE(MTXORB_VID, MTXORB_FTDI_RANGE_01ED_PID) },
        { USB_DEVICE(MTXORB_VID, MTXORB_FTDI_RANGE_01EE_PID) },
        { USB_DEVICE(MTXORB_VID, MTXORB_FTDI_RANGE_01EF_PID) },
        { USB_DEVICE(MTXORB_VID, MTXORB_FTDI_RANGE_01F0_PID) },
        { USB_DEVICE(MTXORB_VID, MTXORB_FTDI_RANGE_01F1_PID) },
        { USB_DEVICE(MTXORB_VID, MTXORB_FTDI_RANGE_01F2_PID) },
        { USB_DEVICE(MTXORB_VID, MTXORB_FTDI_RANGE_01F3_PID) },
        { USB_DEVICE(MTXORB_VID, MTXORB_FTDI_RANGE_01F4_PID) },
        { USB_DEVICE(MTXORB_VID, MTXORB_FTDI_RANGE_01F5_PID) },
        { USB_DEVICE(MTXORB_VID, MTXORB_FTDI_RANGE_01F6_PID) },
        { USB_DEVICE(MTXORB_VID, MTXORB_FTDI_RANGE_01F7_PID) },
        { USB_DEVICE(MTXORB_VID, MTXORB_FTDI_RANGE_01F8_PID) },
        { USB_DEVICE(MTXORB_VID, MTXORB_FTDI_RANGE_01F9_PID) },
        { USB_DEVICE(MTXORB_VID, MTXORB_FTDI_RANGE_01FA_PID) },
        { USB_DEVICE(MTXORB_VID, MTXORB_FTDI_RANGE_01FB_PID) },
        { USB_DEVICE(MTXORB_VID, MTXORB_FTDI_RANGE_01FC_PID) },
        { USB_DEVICE(MTXORB_VID, MTXORB_FTDI_RANGE_01FD_PID) },
        { USB_DEVICE(MTXORB_VID, MTXORB_FTDI_RANGE_01FE_PID) },
        { USB_DEVICE(MTXORB_VID, MTXORB_FTDI_RANGE_01FF_PID) },
        { USB_DEVICE(FTDI_VID, FTDI_PERLE_ULTRAPORT_PID) },
        { USB_DEVICE(FTDI_VID, FTDI_PIEGROUP_PID) },
        { USB_DEVICE(FTDI_VID, FTDI_TNC_X_PID) },
        { USB_DEVICE(FTDI_VID, FTDI_USBX_707_PID) },
        { USB_DEVICE(SEALEVEL_VID, SEALEVEL_2101_PID) },
        { USB_DEVICE(SEALEVEL_VID, SEALEVEL_2102_PID) },
        { USB_DEVICE(SEALEVEL_VID, SEALEVEL_2103_PID) },
        { USB_DEVICE(SEALEVEL_VID, SEALEVEL_2104_PID) },
        { USB_DEVICE(SEALEVEL_VID, SEALEVEL_2106_PID) },
        { USB_DEVICE(SEALEVEL_VID, SEALEVEL_2201_1_PID) },
        { USB_DEVICE(SEALEVEL_VID, SEALEVEL_2201_2_PID) },
        { USB_DEVICE(SEALEVEL_VID, SEALEVEL_2202_1_PID) },
        { USB_DEVICE(SEALEVEL_VID, SEALEVEL_2202_2_PID) },
        { USB_DEVICE(SEALEVEL_VID, SEALEVEL_2203_1_PID) },
        { USB_DEVICE(SEALEVEL_VID, SEALEVEL_2203_2_PID) },
        { USB_DEVICE(SEALEVEL_VID, SEALEVEL_2401_1_PID) },
        { USB_DEVICE(SEALEVEL_VID, SEALEVEL_2401_2_PID) },
        { USB_DEVICE(SEALEVEL_VID, SEALEVEL_2401_3_PID) },
        { USB_DEVICE(SEALEVEL_VID, SEALEVEL_2401_4_PID) },
        { USB_DEVICE(SEALEVEL_VID, SEALEVEL_2402_1_PID) },
        { USB_DEVICE(SEALEVEL_VID, SEALEVEL_2402_2_PID) },
        { USB_DEVICE(SEALEVEL_VID, SEALEVEL_2402_3_PID) },
        { USB_DEVICE(SEALEVEL_VID, SEALEVEL_2402_4_PID) },
        { USB_DEVICE(SEALEVEL_VID, SEALEVEL_2403_1_PID) },
        { USB_DEVICE(SEALEVEL_VID, SEALEVEL_2403_2_PID) },
        { USB_DEVICE(SEALEVEL_VID, SEALEVEL_2403_3_PID) },
        { USB_DEVICE(SEALEVEL_VID, SEALEVEL_2403_4_PID) },
        { USB_DEVICE(SEALEVEL_VID, SEALEVEL_2801_1_PID) },
        { USB_DEVICE(SEALEVEL_VID, SEALEVEL_2801_2_PID) },
        { USB_DEVICE(SEALEVEL_VID, SEALEVEL_2801_3_PID) },
        { USB_DEVICE(SEALEVEL_VID, SEALEVEL_2801_4_PID) },
        { USB_DEVICE(SEALEVEL_VID, SEALEVEL_2801_5_PID) },
        { USB_DEVICE(SEALEVEL_VID, SEALEVEL_2801_6_PID) },
        { USB_DEVICE(SEALEVEL_VID, SEALEVEL_2801_7_PID) },
        { USB_DEVICE(SEALEVEL_VID, SEALEVEL_2801_8_PID) },
        { USB_DEVICE(SEALEVEL_VID, SEALEVEL_2802_1_PID) },
        { USB_DEVICE(SEALEVEL_VID, SEALEVEL_2802_2_PID) },
        { USB_DEVICE(SEALEVEL_VID, SEALEVEL_2802_3_PID) },
        { USB_DEVICE(SEALEVEL_VID, SEALEVEL_2802_4_PID) },
        { USB_DEVICE(SEALEVEL_VID, SEALEVEL_2802_5_PID) },
        { USB_DEVICE(SEALEVEL_VID, SEALEVEL_2802_6_PID) },
        { USB_DEVICE(SEALEVEL_VID, SEALEVEL_2802_7_PID) },
        { USB_DEVICE(SEALEVEL_VID, SEALEVEL_2802_8_PID) },
        { USB_DEVICE(SEALEVEL_VID, SEALEVEL_2803_1_PID) },
        { USB_DEVICE(SEALEVEL_VID, SEALEVEL_2803_2_PID) },
        { USB_DEVICE(SEALEVEL_VID, SEALEVEL_2803_3_PID) },
        { USB_DEVICE(SEALEVEL_VID, SEALEVEL_2803_4_PID) },
        { USB_DEVICE(SEALEVEL_VID, SEALEVEL_2803_5_PID) },
        { USB_DEVICE(SEALEVEL_VID, SEALEVEL_2803_6_PID) },
        { USB_DEVICE(SEALEVEL_VID, SEALEVEL_2803_7_PID) },
        { USB_DEVICE(SEALEVEL_VID, SEALEVEL_2803_8_PID) },
        { USB_DEVICE(IDTECH_VID, IDTECH_IDT1221U_PID) },
        { USB_DEVICE(OCT_VID, OCT_US101_PID) },
        { USB_DEVICE(FTDI_VID, FTDI_HE_TIRA1_PID),
                .driver_info = (kernel_ulong_t)&ftdi_HE_TIRA1_quirk },
        { USB_DEVICE(FTDI_VID, FTDI_USB_UIRT_PID),
                .driver_info = (kernel_ulong_t)&ftdi_USB_UIRT_quirk },
        { USB_DEVICE(FTDI_VID, PROTEGO_SPECIAL_1) },
        { USB_DEVICE(FTDI_VID, PROTEGO_R2X0) },
        { USB_DEVICE(FTDI_VID, PROTEGO_SPECIAL_3) },
        { USB_DEVICE(FTDI_VID, PROTEGO_SPECIAL_4) },
        { USB_DEVICE(FTDI_VID, FTDI_GUDEADS_E808_PID) },
        { USB_DEVICE(FTDI_VID, FTDI_GUDEADS_E809_PID) },
        { USB_DEVICE(FTDI_VID, FTDI_GUDEADS_E80A_PID) },
        { USB_DEVICE(FTDI_VID, FTDI_GUDEADS_E80B_PID) },
        { USB_DEVICE(FTDI_VID, FTDI_GUDEADS_E80C_PID) },
        { USB_DEVICE(FTDI_VID, FTDI_GUDEADS_E80D_PID) },
        { USB_DEVICE(FTDI_VID, FTDI_GUDEADS_E80E_PID) },
        { USB_DEVICE(FTDI_VID, FTDI_GUDEADS_E80F_PID) },
        { USB_DEVICE(FTDI_VID, FTDI_GUDEADS_E888_PID) },
        { USB_DEVICE(FTDI_VID, FTDI_GUDEADS_E889_PID) },
        { USB_DEVICE(FTDI_VID, FTDI_GUDEADS_E88A_PID) },
        { USB_DEVICE(FTDI_VID, FTDI_GUDEADS_E88B_PID) },
        { USB_DEVICE(FTDI_VID, FTDI_GUDEADS_E88C_PID) },
        { USB_DEVICE(FTDI_VID, FTDI_GUDEADS_E88D_PID) },
        { USB_DEVICE(FTDI_VID, FTDI_GUDEADS_E88E_PID) },
        { USB_DEVICE(FTDI_VID, FTDI_GUDEADS_E88F_PID) },
        { USB_DEVICE(FTDI_VID, FTDI_ELV_UO100_PID) },
        { USB_DEVICE(FTDI_VID, FTDI_ELV_UM100_PID) },
        { USB_DEVICE(FTDI_VID, FTDI_ELV_UR100_PID) },
        { USB_DEVICE(FTDI_VID, FTDI_ELV_ALC8500_PID) },
        { USB_DEVICE(FTDI_VID, FTDI_PYRAMID_PID) },
        { USB_DEVICE(FTDI_VID, FTDI_ELV_FHZ1000PC_PID) },
        { USB_DEVICE(FTDI_VID, FTDI_IBS_US485_PID) },
        { USB_DEVICE(FTDI_VID, FTDI_IBS_PICPRO_PID) },
        { USB_DEVICE(FTDI_VID, FTDI_IBS_PCMCIA_PID) },
        { USB_DEVICE(FTDI_VID, FTDI_IBS_PK1_PID) },
        { USB_DEVICE(FTDI_VID, FTDI_IBS_RS232MON_PID) },
        { USB_DEVICE(FTDI_VID, FTDI_IBS_APP70_PID) },
        { USB_DEVICE(FTDI_VID, FTDI_IBS_PEDO_PID) },
        { USB_DEVICE(FTDI_VID, FTDI_IBS_PROD_PID) },
        /*
         * ELV devices:
         */
        { USB_DEVICE(FTDI_VID, FTDI_ELV_USR_PID) },
        { USB_DEVICE(FTDI_VID, FTDI_ELV_MSM1_PID) },
        { USB_DEVICE(FTDI_VID, FTDI_ELV_KL100_PID) },
        { USB_DEVICE(FTDI_VID, FTDI_ELV_WS550_PID) },
        { USB_DEVICE(FTDI_VID, FTDI_ELV_EC3000_PID) },
        { USB_DEVICE(FTDI_VID, FTDI_ELV_WS888_PID) },
        { USB_DEVICE(FTDI_VID, FTDI_ELV_TWS550_PID) },
        { USB_DEVICE(FTDI_VID, FTDI_ELV_FEM_PID) },
        { USB_DEVICE(FTDI_VID, FTDI_ELV_CLI7000_PID) },
        { USB_DEVICE(FTDI_VID, FTDI_ELV_PPS7330_PID) },
        { USB_DEVICE(FTDI_VID, FTDI_ELV_TFM100_PID) },
        { USB_DEVICE(FTDI_VID, FTDI_ELV_UDF77_PID) },
        { USB_DEVICE(FTDI_VID, FTDI_ELV_UIO88_PID) },
        { USB_DEVICE(FTDI_VID, FTDI_ELV_UAD8_PID) },
        { USB_DEVICE(FTDI_VID, FTDI_ELV_UDA7_PID) },
        { USB_DEVICE(FTDI_VID, FTDI_ELV_USI2_PID) },
        { USB_DEVICE(FTDI_VID, FTDI_ELV_T1100_PID) },
        { USB_DEVICE(FTDI_VID, FTDI_ELV_PCD200_PID) },
        { USB_DEVICE(FTDI_VID, FTDI_ELV_ULA200_PID) },
        { USB_DEVICE(FTDI_VID, FTDI_ELV_CSI8_PID) },
        { USB_DEVICE(FTDI_VID, FTDI_ELV_EM1000DL_PID) },
        { USB_DEVICE(FTDI_VID, FTDI_ELV_PCK100_PID) },
        { USB_DEVICE(FTDI_VID, FTDI_ELV_RFP500_PID) },
        { USB_DEVICE(FTDI_VID, FTDI_ELV_FS20SIG_PID) },
        { USB_DEVICE(FTDI_VID, FTDI_ELV_UTP8_PID) },
        { USB_DEVICE(FTDI_VID, FTDI_ELV_WS300PC_PID) },
        { USB_DEVICE(FTDI_VID, FTDI_ELV_WS444PC_PID) },
        { USB_DEVICE(FTDI_VID, FTDI_ELV_FHZ1300PC_PID) },
        { USB_DEVICE(FTDI_VID, FTDI_ELV_EM1010PC_PID) },
        { USB_DEVICE(FTDI_VID, FTDI_ELV_WS500_PID) },
        { USB_DEVICE(FTDI_VID, FTDI_ELV_HS485_PID) },
        { USB_DEVICE(FTDI_VID, FTDI_ELV_UMS100_PID) },
        { USB_DEVICE(FTDI_VID, FTDI_ELV_TFD128_PID) },
        { USB_DEVICE(FTDI_VID, FTDI_ELV_FM3RX_PID) },
        { USB_DEVICE(FTDI_VID, FTDI_ELV_WS777_PID) },
        { USB_DEVICE(FTDI_VID, LINX_SDMUSBQSS_PID) },
        { USB_DEVICE(FTDI_VID, LINX_MASTERDEVEL2_PID) },
        { USB_DEVICE(FTDI_VID, LINX_FUTURE_0_PID) },
        { USB_DEVICE(FTDI_VID, LINX_FUTURE_1_PID) },
        { USB_DEVICE(FTDI_VID, LINX_FUTURE_2_PID) },
        { USB_DEVICE(FTDI_VID, FTDI_CCSICDU20_0_PID) },
        { USB_DEVICE(FTDI_VID, FTDI_CCSICDU40_1_PID) },
        { USB_DEVICE(FTDI_VID, FTDI_CCSMACHX_2_PID) },
        { USB_DEVICE(FTDI_VID, FTDI_CCSLOAD_N_GO_3_PID) },
        { USB_DEVICE(FTDI_VID, FTDI_CCSICDU64_4_PID) },
        { USB_DEVICE(FTDI_VID, FTDI_CCSPRIME8_5_PID) },
        { USB_DEVICE(FTDI_VID, INSIDE_ACCESSO) },
        { USB_DEVICE(INTREPID_VID, INTREPID_VALUECAN_PID) },
        { USB_DEVICE(INTREPID_VID, INTREPID_NEOVI_PID) },
        { USB_DEVICE(FALCOM_VID, FALCOM_TWIST_PID) },
        { USB_DEVICE(FALCOM_VID, FALCOM_SAMBA_PID) },
        { USB_DEVICE(FTDI_VID, FTDI_SUUNTO_SPORTS_PID) },
        { USB_DEVICE(FTDI_VID, FTDI_OCEANIC_PID) },
        { USB_DEVICE(TTI_VID, TTI_QL355P_PID) },
        { USB_DEVICE(FTDI_VID, FTDI_RM_CANVIEW_PID) },
        { USB_DEVICE(CONTEC_VID, CONTEC_COM1USBH_PID) },
        { USB_DEVICE(BANDB_VID, BANDB_USOTL4_PID) },
        { USB_DEVICE(BANDB_VID, BANDB_USTL4_PID) },
        { USB_DEVICE(BANDB_VID, BANDB_USO9ML2_PID) },
        { USB_DEVICE(BANDB_VID, BANDB_USOPTL4_PID) },
        { USB_DEVICE(BANDB_VID, BANDB_USPTL4_PID) },
        { USB_DEVICE(BANDB_VID, BANDB_USO9ML2DR_2_PID) },
        { USB_DEVICE(BANDB_VID, BANDB_USO9ML2DR_PID) },
        { USB_DEVICE(BANDB_VID, BANDB_USOPTL4DR2_PID) },
        { USB_DEVICE(BANDB_VID, BANDB_USOPTL4DR_PID) },
        { USB_DEVICE(BANDB_VID, BANDB_485USB9F_2W_PID) },
        { USB_DEVICE(BANDB_VID, BANDB_485USB9F_4W_PID) },
        { USB_DEVICE(BANDB_VID, BANDB_232USB9M_PID) },
        { USB_DEVICE(BANDB_VID, BANDB_485USBTB_2W_PID) },
        { USB_DEVICE(BANDB_VID, BANDB_485USBTB_4W_PID) },
        { USB_DEVICE(BANDB_VID, BANDB_TTL5USB9M_PID) },
        { USB_DEVICE(BANDB_VID, BANDB_TTL3USB9M_PID) },
        { USB_DEVICE(BANDB_VID, BANDB_ZZ_PROG1_USB_PID) },
        { USB_DEVICE(FTDI_VID, EVER_ECO_PRO_CDS) },
        { USB_DEVICE(FTDI_VID, FTDI_4N_GALAXY_DE_1_PID) },
        { USB_DEVICE(FTDI_VID, FTDI_4N_GALAXY_DE_2_PID) },
        { USB_DEVICE(FTDI_VID, XSENS_CONVERTER_0_PID) },
        { USB_DEVICE(FTDI_VID, XSENS_CONVERTER_1_PID) },
        { USB_DEVICE(FTDI_VID, XSENS_CONVERTER_2_PID) },
        { USB_DEVICE(FTDI_VID, XSENS_CONVERTER_3_PID) },
        { USB_DEVICE(FTDI_VID, XSENS_CONVERTER_4_PID) },
        { USB_DEVICE(FTDI_VID, XSENS_CONVERTER_5_PID) },
        { USB_DEVICE(FTDI_VID, XSENS_CONVERTER_6_PID) },
        { USB_DEVICE(FTDI_VID, XSENS_CONVERTER_7_PID) },
        { USB_DEVICE(MOBILITY_VID, MOBILITY_USB_SERIAL_PID) },
        { USB_DEVICE(FTDI_VID, FTDI_ACTIVE_ROBOTS_PID) },
        { USB_DEVICE(FTDI_VID, FTDI_MHAM_KW_PID) },
        { USB_DEVICE(FTDI_VID, FTDI_MHAM_YS_PID) },
        { USB_DEVICE(FTDI_VID, FTDI_MHAM_Y6_PID) },
        { USB_DEVICE(FTDI_VID, FTDI_MHAM_Y8_PID) },
        { USB_DEVICE(FTDI_VID, FTDI_MHAM_IC_PID) },
        { USB_DEVICE(FTDI_VID, FTDI_MHAM_DB9_PID) },
        { USB_DEVICE(FTDI_VID, FTDI_MHAM_RS232_PID) },
        { USB_DEVICE(FTDI_VID, FTDI_MHAM_Y9_PID) },
        { USB_DEVICE(FTDI_VID, FTDI_TERATRONIK_VCP_PID) },
        { USB_DEVICE(FTDI_VID, FTDI_TERATRONIK_D2XX_PID) },
        { USB_DEVICE(EVOLUTION_VID, EVOLUTION_ER1_PID) },
        { USB_DEVICE(EVOLUTION_VID, EVO_HYBRID_PID) },
        { USB_DEVICE(EVOLUTION_VID, EVO_RCM4_PID) },
        { USB_DEVICE(CONTEC_VID, CONTEC_COM1USBH_PID) },
        { USB_DEVICE(FTDI_VID, FTDI_ARTEMIS_PID) },
        { USB_DEVICE(FTDI_VID, FTDI_ATIK_ATK16_PID) },
        { USB_DEVICE(FTDI_VID, FTDI_ATIK_ATK16C_PID) },
        { USB_DEVICE(FTDI_VID, FTDI_ATIK_ATK16HR_PID) },
        { USB_DEVICE(FTDI_VID, FTDI_ATIK_ATK16HRC_PID) },
        { USB_DEVICE(FTDI_VID, FTDI_ATIK_ATK16IC_PID) },
        { USB_DEVICE(KOBIL_VID, KOBIL_CONV_B1_PID) },
        { USB_DEVICE(KOBIL_VID, KOBIL_CONV_KAAN_PID) },
        { USB_DEVICE(POSIFLEX_VID, POSIFLEX_PP7000_PID) },
        { USB_DEVICE(FTDI_VID, FTDI_TTUSB_PID) },
        { USB_DEVICE(FTDI_VID, FTDI_ECLO_COM_1WIRE_PID) },
        { USB_DEVICE(FTDI_VID, FTDI_WESTREX_MODEL_777_PID) },
        { USB_DEVICE(FTDI_VID, FTDI_WESTREX_MODEL_8900F_PID) },
        { USB_DEVICE(FTDI_VID, FTDI_PCDJ_DAC2_PID) },
        { USB_DEVICE(FTDI_VID, FTDI_RRCIRKITS_LOCOBUFFER_PID) },
        { USB_DEVICE(FTDI_VID, FTDI_ASK_RDR400_PID) },
        { USB_DEVICE(ICOM_ID1_VID, ICOM_ID1_PID) },
        { USB_DEVICE(PAPOUCH_VID, PAPOUCH_TMU_PID) },
        { USB_DEVICE(FTDI_VID, FTDI_ACG_HFDUAL_PID) },
        { USB_DEVICE(FTDI_VID, FTDI_YEI_SERVOCENTER31_PID) },
        { USB_DEVICE(FTDI_VID, FTDI_THORLABS_PID) },
        { USB_DEVICE(TESTO_VID, TESTO_USB_INTERFACE_PID) },
        { USB_DEVICE(FTDI_VID, FTDI_GAMMA_SCOUT_PID) },
        { USB_DEVICE(FTDI_VID, FTDI_TACTRIX_OPENPORT_13M_PID) },
        { USB_DEVICE(FTDI_VID, FTDI_TACTRIX_OPENPORT_13S_PID) },
        { USB_DEVICE(FTDI_VID, FTDI_TACTRIX_OPENPORT_13U_PID) },
        { USB_DEVICE(ELEKTOR_VID, ELEKTOR_FT323R_PID) },
        { USB_DEVICE(FTDI_VID, FTDI_NDI_HUC_PID),
                .driver_info = (kernel_ulong_t)&ftdi_NDI_device_quirk },
        { USB_DEVICE(FTDI_VID, FTDI_NDI_SPECTRA_SCU_PID),
                .driver_info = (kernel_ulong_t)&ftdi_NDI_device_quirk },
        { USB_DEVICE(FTDI_VID, FTDI_NDI_FUTURE_2_PID),
                .driver_info = (kernel_ulong_t)&ftdi_NDI_device_quirk },
        { USB_DEVICE(FTDI_VID, FTDI_NDI_FUTURE_3_PID),
                .driver_info = (kernel_ulong_t)&ftdi_NDI_device_quirk },
        { USB_DEVICE(FTDI_VID, FTDI_NDI_AURORA_SCU_PID),
                .driver_info = (kernel_ulong_t)&ftdi_NDI_device_quirk },
        { USB_DEVICE(TELLDUS_VID, TELLDUS_TELLSTICK_PID) },
        { USB_DEVICE(FTDI_VID, FTDI_MAXSTREAM_PID) },
        { USB_DEVICE(FTDI_VID, FTDI_PHI_FISCO_PID) },
        { USB_DEVICE(TML_VID, TML_USB_SERIAL_PID) },
        { USB_DEVICE(FTDI_VID, FTDI_ELSTER_UNICOM_PID) },
        { USB_DEVICE(FTDI_VID, FTDI_PROPOX_JTAGCABLEII_PID) },
        { USB_DEVICE(OLIMEX_VID, OLIMEX_ARM_USB_OCD_PID),
                .driver_info = (kernel_ulong_t)&ftdi_jtag_quirk },
        { USB_DEVICE(FIC_VID, FIC_NEO1973_DEBUG_PID),
                .driver_info = (kernel_ulong_t)&ftdi_jtag_quirk },
        { USB_DEVICE(FTDI_VID, FTDI_OOCDLINK_PID),
                .driver_info = (kernel_ulong_t)&ftdi_jtag_quirk },
        { USB_DEVICE(FTDI_VID, LMI_LM3S_DEVEL_BOARD_PID),
                .driver_info = (kernel_ulong_t)&ftdi_jtag_quirk },
        { USB_DEVICE(FTDI_VID, LMI_LM3S_EVAL_BOARD_PID),
                .driver_info = (kernel_ulong_t)&ftdi_jtag_quirk },
        { USB_DEVICE(FTDI_VID, FTDI_TURTELIZER_PID),
                .driver_info = (kernel_ulong_t)&ftdi_jtag_quirk },
        { USB_DEVICE(RATOC_VENDOR_ID, RATOC_PRODUCT_ID_USB60F) },
        { USB_DEVICE(FTDI_VID, FTDI_REU_TINY_PID) },
        { USB_DEVICE(PAPOUCH_VID, PAPOUCH_QUIDO4x4_PID) },
        { USB_DEVICE(PAPOUCH_VID, PAPOUCH_AD4USB_PID) },
        { USB_DEVICE(FTDI_VID, FTDI_DOMINTELL_DGQG_PID) },
        { USB_DEVICE(FTDI_VID, FTDI_DOMINTELL_DUSB_PID) },
        { USB_DEVICE(ALTI2_VID, ALTI2_N3_PID) },
        { USB_DEVICE(FTDI_VID, DIEBOLD_BCS_SE923_PID) },
        { USB_DEVICE(ATMEL_VID, STK541_PID) },
        { USB_DEVICE(DE_VID, STB_PID) },
        { USB_DEVICE(DE_VID, WHT_PID) },
        { USB_DEVICE(ADI_VID, ADI_GNICE_PID),
                .driver_info = (kernel_ulong_t)&ftdi_jtag_quirk },
        { USB_DEVICE(ADI_VID, ADI_GNICEPLUS_PID),
                .driver_info = (kernel_ulong_t)&ftdi_jtag_quirk },
        { USB_DEVICE(JETI_VID, JETI_SPC1201_PID) },
        { USB_DEVICE(MARVELL_VID, MARVELL_SHEEVAPLUG_PID),
                .driver_info = (kernel_ulong_t)&ftdi_jtag_quirk },
        { USB_DEVICE(LARSENBRUSGAARD_VID, LB_ALTITRACK_PID) },
        { USB_DEVICE(GN_OTOMETRICS_VID, AURICAL_USB_PID) },
        { USB_DEVICE(BAYER_VID, BAYER_CONTOUR_CABLE_PID) },
        { USB_DEVICE(FTDI_VID, MARVELL_OPENRD_PID),
                .driver_info = (kernel_ulong_t)&ftdi_jtag_quirk },
        { USB_DEVICE(FTDI_VID, HAMEG_HO820_PID) },
        { USB_DEVICE(FTDI_VID, HAMEG_HO870_PID) },
        { USB_DEVICE(FTDI_VID, MJSG_GENERIC_PID) },
        { USB_DEVICE(FTDI_VID, MJSG_SR_RADIO_PID) },
        { USB_DEVICE(FTDI_VID, MJSG_HD_RADIO_PID) },
        { USB_DEVICE(FTDI_VID, MJSG_XM_RADIO_PID) },
        { },                                    /* Optional parameter entry */
        { }                                     /* Terminating entry */
};

MODULE_DEVICE_TABLE(usb, id_table_combined);

static struct usb_driver ftdi_driver = {
        .name =         "ftdi_sio",
        .probe =        usb_serial_probe,
        .disconnect =   usb_serial_disconnect,
        .id_table =     id_table_combined,
        .no_dynamic_id =        1,
};

static const char *ftdi_chip_name[] = {
        [SIO] = "SIO",  /* the serial part of FT8U100AX */
        [FT8U232AM] = "FT8U232AM",
        [FT232BM] = "FT232BM",
        [FT2232C] = "FT2232C",
        [FT232RL] = "FT232RL",
        [FT2232H] = "FT2232H",
        [FT4232H] = "FT4232H"
};


/* Constants for read urb and write urb */
#define BUFSZ 512

/* Used for TIOCMIWAIT */
#define FTDI_STATUS_B0_MASK     (FTDI_RS0_CTS | FTDI_RS0_DSR | FTDI_RS0_RI | FTDI_RS0_RLSD)
#define FTDI_STATUS_B1_MASK     (FTDI_RS_BI)
/* End TIOCMIWAIT */

#define FTDI_IMPL_ASYNC_FLAGS = (ASYNC_SPD_HI | ASYNC_SPD_VHI \
 | ASYNC_SPD_CUST | ASYNC_SPD_SHI | ASYNC_SPD_WARP)

/* function prototypes for a FTDI serial converter */
static int  ftdi_sio_probe(struct usb_serial *serial,
                                        const struct usb_device_id *id);
static int  ftdi_sio_port_probe(struct usb_serial_port *port);
static int  ftdi_sio_port_remove(struct usb_serial_port *port);
static int  ftdi_open(struct tty_struct *tty, struct usb_serial_port *port);
static void ftdi_close(struct usb_serial_port *port);
static void ftdi_dtr_rts(struct usb_serial_port *port, int on);
static int  ftdi_write(struct tty_struct *tty, struct usb_serial_port *port,
                        const unsigned char *buf, int count);
static int  ftdi_write_room(struct tty_struct *tty);
static int  ftdi_chars_in_buffer(struct tty_struct *tty);
static void ftdi_write_bulk_callback(struct urb *urb);
static void ftdi_read_bulk_callback(struct urb *urb);
static void ftdi_process_read(struct usb_serial_port *port);
static void ftdi_set_termios(struct tty_struct *tty,
                        struct usb_serial_port *port, struct ktermios *old);
static int  ftdi_tiocmget(struct tty_struct *tty, struct file *file);
static int  ftdi_tiocmset(struct tty_struct *tty, struct file *file,
                        unsigned int set, unsigned int clear);
static int  ftdi_ioctl(struct tty_struct *tty, struct file *file,
                        unsigned int cmd, unsigned long arg);
static void ftdi_break_ctl(struct tty_struct *tty, int break_state);
static void ftdi_throttle(struct tty_struct *tty);
static void ftdi_unthrottle(struct tty_struct *tty);

static unsigned short int ftdi_232am_baud_base_to_divisor(int baud, int base);
static unsigned short int ftdi_232am_baud_to_divisor(int baud);
static __u32 ftdi_232bm_baud_base_to_divisor(int baud, int base);
static __u32 ftdi_232bm_baud_to_divisor(int baud);
static __u32 ftdi_2232h_baud_base_to_divisor(int baud, int base);
static __u32 ftdi_2232h_baud_to_divisor(int baud);

static struct usb_serial_driver ftdi_sio_device = {
        .driver = {
                .owner =        THIS_MODULE,
                .name =         "ftdi_sio",
        },
        .description =          "FTDI USB Serial Device",
        .usb_driver =           &ftdi_driver,
        .id_table =             id_table_combined,
        .num_ports =            1,
        .probe =                ftdi_sio_probe,
        .port_probe =           ftdi_sio_port_probe,
        .port_remove =          ftdi_sio_port_remove,
        .open =                 ftdi_open,
        .close =                ftdi_close,
        .dtr_rts =              ftdi_dtr_rts,
        .throttle =             ftdi_throttle,
        .unthrottle =           ftdi_unthrottle,
        .write =                ftdi_write,
        .write_room =           ftdi_write_room,
        .chars_in_buffer =      ftdi_chars_in_buffer,
        .read_bulk_callback =   ftdi_read_bulk_callback,
        .write_bulk_callback =  ftdi_write_bulk_callback,
        .tiocmget =             ftdi_tiocmget,
        .tiocmset =             ftdi_tiocmset,
        .ioctl =                ftdi_ioctl,
        .set_termios =          ftdi_set_termios,
        .break_ctl =            ftdi_break_ctl,
};


#define WDR_TIMEOUT 5000 /* default urb timeout */
#define WDR_SHORT_TIMEOUT 1000  /* shorter urb timeout */

/* High and low are for DTR, RTS etc etc */
#define HIGH 1
#define LOW 0

/* number of outstanding urbs to prevent userspace DoS from happening */
#define URB_UPPER_LIMIT 42

/*
 * ***************************************************************************
 * Utility functions
 * ***************************************************************************
 */

static unsigned short int ftdi_232am_baud_base_to_divisor(int baud, int base)
{
        unsigned short int divisor;
        /* divisor shifted 3 bits to the left */
        int divisor3 = base / 2 / baud;
        if ((divisor3 & 0x7) == 7)
                divisor3++; /* round x.7/8 up to x+1 */
        divisor = divisor3 >> 3;
        divisor3 &= 0x7;
        if (divisor3 == 1)
                divisor |= 0xc000;
        else if (divisor3 >= 4)
                divisor |= 0x4000;
        else if (divisor3 != 0)
                divisor |= 0x8000;
        else if (divisor == 1)
                divisor = 0;    /* special case for maximum baud rate */
        return divisor;
}

static unsigned short int ftdi_232am_baud_to_divisor(int baud)
{
         return ftdi_232am_baud_base_to_divisor(baud, 48000000);
}

static __u32 ftdi_232bm_baud_base_to_divisor(int baud, int base)
{
        static const unsigned char divfrac[8] = { 0, 3, 2, 4, 1, 5, 6, 7 };
        __u32 divisor;
        /* divisor shifted 3 bits to the left */
        int divisor3 = base / 2 / baud;
        divisor = divisor3 >> 3;
        divisor |= (__u32)divfrac[divisor3 & 0x7] << 14;
        /* Deal with special cases for highest baud rates. */
        if (divisor == 1)
                divisor = 0;
        else if (divisor == 0x4001)
                divisor = 1;
        return divisor;
}

static __u32 ftdi_232bm_baud_to_divisor(int baud)
{
         return ftdi_232bm_baud_base_to_divisor(baud, 48000000);
}

static __u32 ftdi_2232h_baud_base_to_divisor(int baud, int base)
{
        static const unsigned char divfrac[8] = { 0, 3, 2, 4, 1, 5, 6, 7 };
        __u32 divisor;
        int divisor3;

        /* hi-speed baud rate is 10-bit sampling instead of 16-bit */
        divisor3 = (base / 10 / baud) * 8;

        divisor = divisor3 >> 3;
        divisor |= (__u32)divfrac[divisor3 & 0x7] << 14;
        /* Deal with special cases for highest baud rates. */
        if (divisor == 1)
                divisor = 0;
        else if (divisor == 0x4001)
                divisor = 1;
        /*
         * Set this bit to turn off a divide by 2.5 on baud rate generator
         * This enables baud rates up to 12Mbaud but cannot reach below 1200
         * baud with this bit set
         */
        divisor |= 0x00020000;
        return divisor;
}

static __u32 ftdi_2232h_baud_to_divisor(int baud)
{
         return ftdi_2232h_baud_base_to_divisor(baud, 120000000);
}

#define set_mctrl(port, set)            update_mctrl((port), (set), 0)
#define clear_mctrl(port, clear)        update_mctrl((port), 0, (clear))

static int update_mctrl(struct usb_serial_port *port, unsigned int set,
                                                        unsigned int clear)
{
        struct ftdi_private *priv = usb_get_serial_port_data(port);
        unsigned urb_value;
        int rv;

        if (((set | clear) & (TIOCM_DTR | TIOCM_RTS)) == 0) {
                dbg("%s - DTR|RTS not being set|cleared", __func__);
                return 0;       /* no change */
        }

        clear &= ~set;  /* 'set' takes precedence over 'clear' */
        urb_value = 0;
        if (clear & TIOCM_DTR)
                urb_value |= FTDI_SIO_SET_DTR_LOW;
        if (clear & TIOCM_RTS)
                urb_value |= FTDI_SIO_SET_RTS_LOW;
        if (set & TIOCM_DTR)
                urb_value |= FTDI_SIO_SET_DTR_HIGH;
        if (set & TIOCM_RTS)
                urb_value |= FTDI_SIO_SET_RTS_HIGH;
        rv = usb_control_msg(port->serial->dev,
                               usb_sndctrlpipe(port->serial->dev, 0),
                               FTDI_SIO_SET_MODEM_CTRL_REQUEST,
                               FTDI_SIO_SET_MODEM_CTRL_REQUEST_TYPE,
                               urb_value, priv->interface,
                               NULL, 0, WDR_TIMEOUT);
        if (rv < 0) {
                dbg("%s Error from MODEM_CTRL urb: DTR %s, RTS %s",
                                __func__,
                                (set & TIOCM_DTR) ? "HIGH" :
                                (clear & TIOCM_DTR) ? "LOW" : "unchanged",
                                (set & TIOCM_RTS) ? "HIGH" :
                                (clear & TIOCM_RTS) ? "LOW" : "unchanged");
        } else {
                dbg("%s - DTR %s, RTS %s", __func__,
                                (set & TIOCM_DTR) ? "HIGH" :
                                (clear & TIOCM_DTR) ? "LOW" : "unchanged",
                                (set & TIOCM_RTS) ? "HIGH" :
                                (clear & TIOCM_RTS) ? "LOW" : "unchanged");
                /* FIXME: locking on last_dtr_rts */
                priv->last_dtr_rts = (priv->last_dtr_rts & ~clear) | set;
        }
        return rv;
}


static __u32 get_ftdi_divisor(struct tty_struct *tty,
                                                struct usb_serial_port *port)
{ /* get_ftdi_divisor */
        struct ftdi_private *priv = usb_get_serial_port_data(port);
        __u32 div_value = 0;
        int div_okay = 1;
        int baud;

        /*
         * The logic involved in setting the baudrate can be cleanly split into
         * 3 steps.
         * 1. Standard baud rates are set in tty->termios->c_cflag
         * 2. If these are not enough, you can set any speed using alt_speed as

         * follows:
         *    - set tty->termios->c_cflag speed to B38400
         *    - set your real speed in tty->alt_speed; it gets ignored when
         *      alt_speed==0, (or)
         *    - call TIOCSSERIAL ioctl with (struct serial_struct) set as
         *      follows:
         *      flags & ASYNC_SPD_MASK == ASYNC_SPD_[HI, VHI, SHI, WARP],
         *      this just sets alt_speed to (HI: 57600, VHI: 115200,
         *      SHI: 230400, WARP: 460800)
         * ** Steps 1, 2 are done courtesy of tty_get_baud_rate
         * 3. You can also set baud rate by setting custom divisor as follows
         *    - set tty->termios->c_cflag speed to B38400
         *    - call TIOCSSERIAL ioctl with (struct serial_struct) set as
         *      follows:
         *      o flags & ASYNC_SPD_MASK == ASYNC_SPD_CUST
         *      o custom_divisor set to baud_base / your_new_baudrate
         * ** Step 3 is done courtesy of code borrowed from serial.c
         *    I should really spend some time and separate + move this common
         *    code to serial.c, it is replicated in nearly every serial driver
         *    you see.
         */

        /* 1. Get the baud rate from the tty settings, this observes
              alt_speed hack */

        baud = tty_get_baud_rate(tty);
        dbg("%s - tty_get_baud_rate reports speed %d", __func__, baud);

        /* 2. Observe async-compatible custom_divisor hack, update baudrate
           if needed */

        if (baud == 38400 &&
            ((priv->flags & ASYNC_SPD_MASK) == ASYNC_SPD_CUST) &&
             (priv->custom_divisor)) {
                baud = priv->baud_base / priv->custom_divisor;
                dbg("%s - custom divisor %d sets baud rate to %d",
                                __func__, priv->custom_divisor, baud);
        }

        /* 3. Convert baudrate to device-specific divisor */

        if (!baud)
                baud = 9600;
        switch (priv->chip_type) {
        case SIO: /* SIO chip */
                switch (baud) {
                case 300: div_value = ftdi_sio_b300; break;
                case 600: div_value = ftdi_sio_b600; break;
                case 1200: div_value = ftdi_sio_b1200; break;
                case 2400: div_value = ftdi_sio_b2400; break;
                case 4800: div_value = ftdi_sio_b4800; break;
                case 9600: div_value = ftdi_sio_b9600; break;
                case 19200: div_value = ftdi_sio_b19200; break;
                case 38400: div_value = ftdi_sio_b38400; break;
                case 57600: div_value = ftdi_sio_b57600;  break;
                case 115200: div_value = ftdi_sio_b115200; break;
                } /* baud */
                if (div_value == 0) {
                        dbg("%s - Baudrate (%d) requested is not supported",
                                                        __func__,  baud);
                        div_value = ftdi_sio_b9600;
                        baud = 9600;
                        div_okay = 0;
                }
                break;
        case FT8U232AM: /* 8U232AM chip */
                if (baud <= 3000000) {
                        div_value = ftdi_232am_baud_to_divisor(baud);
                } else {
                        dbg("%s - Baud rate too high!", __func__);
                        baud = 9600;
                        div_value = ftdi_232am_baud_to_divisor(9600);
                        div_okay = 0;
                }
                break;
        case FT232BM: /* FT232BM chip */
        case FT2232C: /* FT2232C chip */
        case FT232RL:
                if (baud <= 3000000) {
                        __u16 product_id = le16_to_cpu(
                                port->serial->dev->descriptor.idProduct);
                        if (((FTDI_NDI_HUC_PID == product_id) ||
                             (FTDI_NDI_SPECTRA_SCU_PID == product_id) ||
                             (FTDI_NDI_FUTURE_2_PID == product_id) ||
                             (FTDI_NDI_FUTURE_3_PID == product_id) ||
                             (FTDI_NDI_AURORA_SCU_PID == product_id)) &&
                            (baud == 19200)) {
                                baud = 1200000;
                        }
                        div_value = ftdi_232bm_baud_to_divisor(baud);
                } else {
                        dbg("%s - Baud rate too high!", __func__);
                        div_value = ftdi_232bm_baud_to_divisor(9600);
                        div_okay = 0;
                        baud = 9600;
                }
                break;
        case FT2232H: /* FT2232H chip */
        case FT4232H: /* FT4232H chip */
                if ((baud <= 12000000) & (baud >= 1200)) {
                        div_value = ftdi_2232h_baud_to_divisor(baud);
                } else if (baud < 1200) {
                        div_value = ftdi_232bm_baud_to_divisor(baud);
                } else {
                        dbg("%s - Baud rate too high!", __func__);
                        div_value = ftdi_232bm_baud_to_divisor(9600);
                        div_okay = 0;
                        baud = 9600;
                }
                break;
        } /* priv->chip_type */

        if (div_okay) {
                dbg("%s - Baud rate set to %d (divisor 0x%lX) on chip %s",
                        __func__, baud, (unsigned long)div_value,
                        ftdi_chip_name[priv->chip_type]);
        }

        tty_encode_baud_rate(tty, baud, baud);
        return div_value;
}

static int change_speed(struct tty_struct *tty, struct usb_serial_port *port)
{
        struct ftdi_private *priv = usb_get_serial_port_data(port);
        __u16 urb_value;
        __u16 urb_index;
        __u32 urb_index_value;
        int rv;

        urb_index_value = get_ftdi_divisor(tty, port);
        urb_value = (__u16)urb_index_value;
        urb_index = (__u16)(urb_index_value >> 16);
        if (priv->interface) {  /* FT2232C */
                urb_index = (__u16)((urb_index << 8) | priv->interface);
        }

        rv = usb_control_msg(port->serial->dev,
                            usb_sndctrlpipe(port->serial->dev, 0),
                            FTDI_SIO_SET_BAUDRATE_REQUEST,
                            FTDI_SIO_SET_BAUDRATE_REQUEST_TYPE,
                            urb_value, urb_index,
                            NULL, 0, WDR_SHORT_TIMEOUT);
        return rv;
}

static int write_latency_timer(struct usb_serial_port *port)
{
        struct ftdi_private *priv = usb_get_serial_port_data(port);
        struct usb_device *udev = port->serial->dev;
        int rv;
        int l = priv->latency;

        if (priv->flags & ASYNC_LOW_LATENCY)
                l = 1;

        dbg("%s: setting latency timer = %i", __func__, l);

        rv = usb_control_msg(udev,
                             usb_sndctrlpipe(udev, 0),
                             FTDI_SIO_SET_LATENCY_TIMER_REQUEST,
                             FTDI_SIO_SET_LATENCY_TIMER_REQUEST_TYPE,
                             l, priv->interface,
                             NULL, 0, WDR_TIMEOUT);
        if (rv < 0)
                dev_err(&port->dev, "Unable to write latency timer: %i\n", rv);
        return rv;
}

static int read_latency_timer(struct usb_serial_port *port)
{
        struct ftdi_private *priv = usb_get_serial_port_data(port);
        struct usb_device *udev = port->serial->dev;
        unsigned char *buf;
        int rv;

        dbg("%s", __func__);

        buf = kmalloc(1, GFP_KERNEL);
        if (!buf)
                return -ENOMEM;

        rv = usb_control_msg(udev,
                             usb_rcvctrlpipe(udev, 0),
                             FTDI_SIO_GET_LATENCY_TIMER_REQUEST,
                             FTDI_SIO_GET_LATENCY_TIMER_REQUEST_TYPE,
                             0, priv->interface,
                             buf, 1, WDR_TIMEOUT);
        if (rv < 0)
                dev_err(&port->dev, "Unable to read latency timer: %i\n", rv);
        else
                priv->latency = buf[0];

        kfree(buf);

        return rv;
}

static int get_serial_info(struct usb_serial_port *port,
                                struct serial_struct __user *retinfo)
{
        struct ftdi_private *priv = usb_get_serial_port_data(port);
        struct serial_struct tmp;

        if (!retinfo)
                return -EFAULT;
        memset(&tmp, 0, sizeof(tmp));
        tmp.flags = priv->flags;
        tmp.baud_base = priv->baud_base;
        tmp.custom_divisor = priv->custom_divisor;
        if (copy_to_user(retinfo, &tmp, sizeof(*retinfo)))
                return -EFAULT;
        return 0;
} /* get_serial_info */


static int set_serial_info(struct tty_struct *tty,
        struct usb_serial_port *port, struct serial_struct __user *newinfo)
{ /* set_serial_info */
        struct ftdi_private *priv = usb_get_serial_port_data(port);
        struct serial_struct new_serial;
        struct ftdi_private old_priv;

        if (copy_from_user(&new_serial, newinfo, sizeof(new_serial)))
                return -EFAULT;

        mutex_lock(&priv->cfg_lock);
        old_priv = *priv;

        /* Do error checking and permission checking */

        if (!capable(CAP_SYS_ADMIN)) {
                if (((new_serial.flags & ~ASYNC_USR_MASK) !=
                     (priv->flags & ~ASYNC_USR_MASK))) {
                        mutex_unlock(&priv->cfg_lock);
                        return -EPERM;
                }
                priv->flags = ((priv->flags & ~ASYNC_USR_MASK) |
                               (new_serial.flags & ASYNC_USR_MASK));
                priv->custom_divisor = new_serial.custom_divisor;
                goto check_and_exit;
        }

        if ((new_serial.baud_base != priv->baud_base) &&
            (new_serial.baud_base < 9600)) {
                mutex_unlock(&priv->cfg_lock);
                return -EINVAL;
        }

        /* Make the changes - these are privileged changes! */

        priv->flags = ((priv->flags & ~ASYNC_FLAGS) |
                                        (new_serial.flags & ASYNC_FLAGS));
        priv->custom_divisor = new_serial.custom_divisor;

        write_latency_timer(port);

check_and_exit:
        if ((old_priv.flags & ASYNC_SPD_MASK) !=
             (priv->flags & ASYNC_SPD_MASK)) {
                if ((priv->flags & ASYNC_SPD_MASK) == ASYNC_SPD_HI)
                        tty->alt_speed = 57600;
                else if ((priv->flags & ASYNC_SPD_MASK) == ASYNC_SPD_VHI)
                        tty->alt_speed = 115200;
                else if ((priv->flags & ASYNC_SPD_MASK) == ASYNC_SPD_SHI)
                        tty->alt_speed = 230400;
                else if ((priv->flags & ASYNC_SPD_MASK) == ASYNC_SPD_WARP)
                        tty->alt_speed = 460800;
                else
                        tty->alt_speed = 0;
        }
        if (((old_priv.flags & ASYNC_SPD_MASK) !=
             (priv->flags & ASYNC_SPD_MASK)) ||
            (((priv->flags & ASYNC_SPD_MASK) == ASYNC_SPD_CUST) &&
             (old_priv.custom_divisor != priv->custom_divisor))) {
                change_speed(tty, port);
                mutex_unlock(&priv->cfg_lock);
        }
        else
                mutex_unlock(&priv->cfg_lock);
        return 0;

} /* set_serial_info */


/* Determine type of FTDI chip based on USB config and descriptor. */
static void ftdi_determine_type(struct usb_serial_port *port)
{
        struct ftdi_private *priv = usb_get_serial_port_data(port);
        struct usb_serial *serial = port->serial;
        struct usb_device *udev = serial->dev;
        unsigned version;
        unsigned interfaces;

        /* Assume it is not the original SIO device for now. */
        priv->baud_base = 48000000 / 2;
        priv->write_offset = 0;

        version = le16_to_cpu(udev->descriptor.bcdDevice);
        interfaces = udev->actconfig->desc.bNumInterfaces;
        dbg("%s: bcdDevice = 0x%x, bNumInterfaces = %u", __func__,
                        version, interfaces);
        if (interfaces > 1) {
                int inter;

                /* Multiple interfaces.*/
                if (version == 0x0800) {
                        priv->chip_type = FT4232H;
                        /* Hi-speed - baud clock runs at 120MHz */
                        priv->baud_base = 120000000 / 2;
                } else if (version == 0x0700) {
                        priv->chip_type = FT2232H;
                        /* Hi-speed - baud clock runs at 120MHz */
                        priv->baud_base = 120000000 / 2;
                } else
                        priv->chip_type = FT2232C;

                /* Determine interface code. */
                inter = serial->interface->altsetting->desc.bInterfaceNumber;
                if (inter == 0) {
                        priv->interface = INTERFACE_A;
                } else  if (inter == 1) {
                        priv->interface = INTERFACE_B;
                } else  if (inter == 2) {
                        priv->interface = INTERFACE_C;
                } else  if (inter == 3) {
                        priv->interface = INTERFACE_D;
                }
                /* BM-type devices have a bug where bcdDevice gets set
                 * to 0x200 when iSerialNumber is 0.  */
                if (version < 0x500) {
                        dbg("%s: something fishy - bcdDevice too low for multi-interface device",
                                        __func__);
                }
        } else if (version < 0x200) {
                /* Old device.  Assume it's the original SIO. */
                priv->chip_type = SIO;
                priv->baud_base = 12000000 / 16;
                priv->write_offset = 1;
        } else if (version < 0x400) {
                /* Assume it's an FT8U232AM (or FT8U245AM) */
                /* (It might be a BM because of the iSerialNumber bug,
                 * but it will still work as an AM device.) */
                priv->chip_type = FT8U232AM;
        } else if (version < 0x600) {
                /* Assume it's an FT232BM (or FT245BM) */
                priv->chip_type = FT232BM;
        } else {
                /* Assume it's an FT232R */
                priv->chip_type = FT232RL;
        }
        dev_info(&udev->dev, "Detected %s\n", ftdi_chip_name[priv->chip_type]);
}


/* Determine the maximum packet size for the device.  This depends on the chip
 * type and the USB host capabilities.  The value should be obtained from the
 * device descriptor as the chip will use the appropriate values for the host.*/
static void ftdi_set_max_packet_size(struct usb_serial_port *port)
{
        struct ftdi_private *priv = usb_get_serial_port_data(port);
        struct usb_serial *serial = port->serial;
        struct usb_device *udev = serial->dev;

        struct usb_interface *interface = serial->interface;
        struct usb_endpoint_descriptor *ep_desc = &interface->cur_altsetting->endpoint[1].desc;

        unsigned num_endpoints;
        int i;

        num_endpoints = interface->cur_altsetting->desc.bNumEndpoints;
        dev_info(&udev->dev, "Number of endpoints %d\n", num_endpoints);

        /* NOTE: some customers have programmed FT232R/FT245R devices
         * with an endpoint size of 0 - not good.  In this case, we
         * want to override the endpoint descriptor setting and use a
         * value of 64 for wMaxPacketSize */
        for (i = 0; i < num_endpoints; i++) {
                dev_info(&udev->dev, "Endpoint %d MaxPacketSize %d\n", i+1,
                        interface->cur_altsetting->endpoint[i].desc.wMaxPacketSize);
                ep_desc = &interface->cur_altsetting->endpoint[i].desc;
                if (ep_desc->wMaxPacketSize == 0) {
                        ep_desc->wMaxPacketSize = cpu_to_le16(0x40);
                        dev_info(&udev->dev, "Overriding wMaxPacketSize on endpoint %d\n", i);
                }
        }

        /* set max packet size based on descriptor */
        priv->max_packet_size = ep_desc->wMaxPacketSize;

        dev_info(&udev->dev, "Setting MaxPacketSize %d\n", priv->max_packet_size);
}


/*
 * ***************************************************************************
 * Sysfs Attribute
 * ***************************************************************************
 */

static ssize_t show_latency_timer(struct device *dev,
                                struct device_attribute *attr, char *buf)
{
        struct usb_serial_port *port = to_usb_serial_port(dev);
        struct ftdi_private *priv = usb_get_serial_port_data(port);
        if (priv->flags & ASYNC_LOW_LATENCY)
                return sprintf(buf, "1\n");
        else
                return sprintf(buf, "%i\n", priv->latency);
}


/* Write a new value of the latency timer, in units of milliseconds. */
static ssize_t store_latency_timer(struct device *dev,
                        struct device_attribute *attr, const char *valbuf,
                        size_t count)
{
        struct usb_serial_port *port = to_usb_serial_port(dev);
        struct ftdi_private *priv = usb_get_serial_port_data(port);
        int v = simple_strtoul(valbuf, NULL, 10);
        int rv;

        priv->latency = v;
        rv = write_latency_timer(port);
        if (rv < 0)
                return -EIO;
        return count;
}

/* Write an event character directly to the FTDI register.  The ASCII
   value is in the low 8 bits, with the enable bit in the 9th bit. */
static ssize_t store_event_char(struct device *dev,
        struct device_attribute *attr, const char *valbuf, size_t count)
{
        struct usb_serial_port *port = to_usb_serial_port(dev);
        struct ftdi_private *priv = usb_get_serial_port_data(port);
        struct usb_device *udev = port->serial->dev;
        int v = simple_strtoul(valbuf, NULL, 10);
        int rv;

        dbg("%s: setting event char = %i", __func__, v);

        rv = usb_control_msg(udev,
                             usb_sndctrlpipe(udev, 0),
                             FTDI_SIO_SET_EVENT_CHAR_REQUEST,
                             FTDI_SIO_SET_EVENT_CHAR_REQUEST_TYPE,
                             v, priv->interface,
                             NULL, 0, WDR_TIMEOUT);
        if (rv < 0) {
                dbg("Unable to write event character: %i", rv);
                return -EIO;
        }

        return count;
}

static DEVICE_ATTR(latency_timer, S_IWUSR | S_IRUGO, show_latency_timer,
                                                        store_latency_timer);
static DEVICE_ATTR(event_char, S_IWUSR, NULL, store_event_char);

static int create_sysfs_attrs(struct usb_serial_port *port)
{
        struct ftdi_private *priv = usb_get_serial_port_data(port);
        int retval = 0;

        dbg("%s", __func__);

        /* XXX I've no idea if the original SIO supports the event_char
         * sysfs parameter, so I'm playing it safe.  */
        if (priv->chip_type != SIO) {
                dbg("sysfs attributes for %s", ftdi_chip_name[priv->chip_type]);
                retval = device_create_file(&port->dev, &dev_attr_event_char);
                if ((!retval) &&
                    (priv->chip_type == FT232BM ||
                     priv->chip_type == FT2232C ||
                     priv->chip_type == FT232RL ||
                     priv->chip_type == FT2232H ||
                     priv->chip_type == FT4232H)) {
                        retval = device_create_file(&port->dev,
                                                    &dev_attr_latency_timer);
                }
        }
        return retval;
}

static void remove_sysfs_attrs(struct usb_serial_port *port)
{
        struct ftdi_private *priv = usb_get_serial_port_data(port);

        dbg("%s", __func__);

        /* XXX see create_sysfs_attrs */
        if (priv->chip_type != SIO) {
                device_remove_file(&port->dev, &dev_attr_event_char);
                if (priv->chip_type == FT232BM ||
                    priv->chip_type == FT2232C ||
                    priv->chip_type == FT232RL ||
                    priv->chip_type == FT2232H ||
                    priv->chip_type == FT4232H) {
                        device_remove_file(&port->dev, &dev_attr_latency_timer);
                }
        }

}

/*
 * ***************************************************************************
 * FTDI driver specific functions
 * ***************************************************************************
 */

/* Probe function to check for special devices */
static int ftdi_sio_probe(struct usb_serial *serial,
                                        const struct usb_device_id *id)
{
        struct ftdi_sio_quirk *quirk =
                                (struct ftdi_sio_quirk *)id->driver_info;

        if (quirk && quirk->probe) {
                int ret = quirk->probe(serial);
                if (ret != 0)
                        return ret;
        }

        usb_set_serial_data(serial, (void *)id->driver_info);

        return 0;
}

static int ftdi_sio_port_probe(struct usb_serial_port *port)
{
        struct ftdi_private *priv;
        struct ftdi_sio_quirk *quirk = usb_get_serial_data(port->serial);


        dbg("%s", __func__);

        priv = kzalloc(sizeof(struct ftdi_private), GFP_KERNEL);
        if (!priv) {
                dev_err(&port->dev, "%s- kmalloc(%Zd) failed.\n", __func__,
                                        sizeof(struct ftdi_private));
                return -ENOMEM;
        }

        kref_init(&priv->kref);
        spin_lock_init(&priv->tx_lock);
        mutex_init(&priv->cfg_lock);
        init_waitqueue_head(&priv->delta_msr_wait);

        priv->flags = ASYNC_LOW_LATENCY;

        if (quirk && quirk->port_probe)
                quirk->port_probe(priv);

        /* Increase the size of read buffers */
        kfree(port->bulk_in_buffer);
        port->bulk_in_buffer = kmalloc(BUFSZ, GFP_KERNEL);
        if (!port->bulk_in_buffer) {
                kfree(priv);
                return -ENOMEM;
        }
        if (port->read_urb) {
                port->read_urb->transfer_buffer = port->bulk_in_buffer;
                port->read_urb->transfer_buffer_length = BUFSZ;
        }

        priv->port = port;

        /* Free port's existing write urb and transfer buffer. */
        if (port->write_urb) {
                usb_free_urb(port->write_urb);
                port->write_urb = NULL;
        }
        kfree(port->bulk_out_buffer);
        port->bulk_out_buffer = NULL;

        usb_set_serial_port_data(port, priv);

        ftdi_determine_type(port);
        ftdi_set_max_packet_size(port);
        if (read_latency_timer(port) < 0)
                priv->latency = 16;
        create_sysfs_attrs(port);
        return 0;
}

/* Setup for the USB-UIRT device, which requires hardwired
 * baudrate (38400 gets mapped to 312500) */
/* Called from usbserial:serial_probe */
static void ftdi_USB_UIRT_setup(struct ftdi_private *priv)
{
        dbg("%s", __func__);

        priv->flags |= ASYNC_SPD_CUST;
        priv->custom_divisor = 77;
        priv->force_baud = 38400;
} /* ftdi_USB_UIRT_setup */

/* Setup for the HE-TIRA1 device, which requires hardwired
 * baudrate (38400 gets mapped to 100000) and RTS-CTS enabled.  */

static void ftdi_HE_TIRA1_setup(struct ftdi_private *priv)
{
        dbg("%s", __func__);

        priv->flags |= ASYNC_SPD_CUST;
        priv->custom_divisor = 240;
        priv->force_baud = 38400;
        priv->force_rtscts = 1;
} /* ftdi_HE_TIRA1_setup */

/*
 * Module parameter to control latency timer for NDI FTDI-based USB devices.
 * If this value is not set in modprobe.conf.local its value will be set to 1ms.
 */
static int ndi_latency_timer = 1;

/* Setup for the NDI FTDI-based USB devices, which requires hardwired
 * baudrate (19200 gets mapped to 1200000).
 *
 * Called from usbserial:serial_probe.
 */
static int ftdi_NDI_device_setup(struct usb_serial *serial)
{
        struct usb_device *udev = serial->dev;
        int latency = ndi_latency_timer;

        if (latency == 0)
                latency = 1;
        if (latency > 99)
                latency = 99;

        dbg("%s setting NDI device latency to %d", __func__, latency);
        dev_info(&udev->dev, "NDI device with a latency value of %d", latency);

        /* FIXME: errors are not returned */
        usb_control_msg(udev, usb_sndctrlpipe(udev, 0),
                                FTDI_SIO_SET_LATENCY_TIMER_REQUEST,
                                FTDI_SIO_SET_LATENCY_TIMER_REQUEST_TYPE,
                                latency, 0, NULL, 0, WDR_TIMEOUT);
        return 0;
}

/*
 * First port on JTAG adaptors such as Olimex arm-usb-ocd or the FIC/OpenMoko
 * Neo1973 Debug Board is reserved for JTAG interface and can be accessed from
 * userspace using openocd.
 */
static int ftdi_jtag_probe(struct usb_serial *serial)
{
        struct usb_device *udev = serial->dev;
        struct usb_interface *interface = serial->interface;

        dbg("%s", __func__);

        if (interface == udev->actconfig->interface[0]) {
                dev_info(&udev->dev,
                         "Ignoring serial port reserved for JTAG\n");
                return -ENODEV;
        }

        return 0;
}

/*
 * The Matrix Orbital VK204-25-USB has an invalid IN endpoint.
 * We have to correct it if we want to read from it.
 */
static int ftdi_mtxorb_hack_setup(struct usb_serial *serial)
{
        struct usb_host_endpoint *ep = serial->dev->ep_in[1];
        struct usb_endpoint_descriptor *ep_desc = &ep->desc;

        if (ep->enabled && ep_desc->wMaxPacketSize == 0) {
                ep_desc->wMaxPacketSize = cpu_to_le16(0x40);
                dev_info(&serial->dev->dev,
                         "Fixing invalid wMaxPacketSize on read pipe\n");
        }

        return 0;
}

static void ftdi_sio_priv_release(struct kref *k)
{
        struct ftdi_private *priv = container_of(k, struct ftdi_private, kref);

        kfree(priv);
}

static int ftdi_sio_port_remove(struct usb_serial_port *port)
{
        struct ftdi_private *priv = usb_get_serial_port_data(port);

        dbg("%s", __func__);

        remove_sysfs_attrs(port);

        kref_put(&priv->kref, ftdi_sio_priv_release);

        return 0;
}

static int ftdi_submit_read_urb(struct usb_serial_port *port, gfp_t mem_flags)
{
        struct urb *urb = port->read_urb;
        struct usb_serial *serial = port->serial;
        int result;

        usb_fill_bulk_urb(urb, serial->dev,
                           usb_rcvbulkpipe(serial->dev,
                                        port->bulk_in_endpointAddress),
                           urb->transfer_buffer,
                           urb->transfer_buffer_length,
                           ftdi_read_bulk_callback, port);
        result = usb_submit_urb(urb, mem_flags);
        if (result && result != -EPERM)
                dev_err(&port->dev,
                        "%s - failed submitting read urb, error %d\n",
                                                        __func__, result);
        return result;
}

static int ftdi_open(struct tty_struct *tty, struct usb_serial_port *port)
{ /* ftdi_open */
        struct usb_device *dev = port->serial->dev;
        struct ftdi_private *priv = usb_get_serial_port_data(port);
        unsigned long flags;
        int result;

        dbg("%s", __func__);

        write_latency_timer(port);

        /* No error checking for this (will get errors later anyway) */
        /* See ftdi_sio.h for description of what is reset */
        usb_control_msg(dev, usb_sndctrlpipe(dev, 0),
                        FTDI_SIO_RESET_REQUEST, FTDI_SIO_RESET_REQUEST_TYPE,
                        FTDI_SIO_RESET_SIO,
                        priv->interface, NULL, 0, WDR_TIMEOUT);

        /* Termios defaults are set by usb_serial_init. We don't change
           port->tty->termios - this would lose speed settings, etc.
           This is same behaviour as serial.c/rs_open() - Kuba */

        /* ftdi_set_termios  will send usb control messages */
        if (tty)
                ftdi_set_termios(tty, port, tty->termios);

        /* Not throttled */
        spin_lock_irqsave(&port->lock, flags);
        port->throttled = 0;
        port->throttle_req = 0;
        spin_unlock_irqrestore(&port->lock, flags);

        /* Start reading from the device */
        result = ftdi_submit_read_urb(port, GFP_KERNEL);
        if (!result)
                kref_get(&priv->kref);

        return result;
} /* ftdi_open */


static void ftdi_dtr_rts(struct usb_serial_port *port, int on)
{
        struct ftdi_private *priv = usb_get_serial_port_data(port);

        mutex_lock(&port->serial->disc_mutex);
        if (!port->serial->disconnected) {
                /* Disable flow control */
                if (!on && usb_control_msg(port->serial->dev,
                            usb_sndctrlpipe(port->serial->dev, 0),
                            FTDI_SIO_SET_FLOW_CTRL_REQUEST,
                            FTDI_SIO_SET_FLOW_CTRL_REQUEST_TYPE,
                            0, priv->interface, NULL, 0,
                            WDR_TIMEOUT) < 0) {
                            dev_err(&port->dev, "error from flowcontrol urb\n");
                }
                /* drop RTS and DTR */
                if (on)
                        set_mctrl(port, TIOCM_DTR | TIOCM_RTS);
                else
                        clear_mctrl(port, TIOCM_DTR | TIOCM_RTS);
        }
        mutex_unlock(&port->serial->disc_mutex);
}

/*
 * usbserial:__serial_close  only calls ftdi_close if the point is open
 *
 *   This only gets called when it is the last close
 *
 *
 */

static void ftdi_close(struct usb_serial_port *port)
{ /* ftdi_close */
        struct ftdi_private *priv = usb_get_serial_port_data(port);

        dbg("%s", __func__);

        /* shutdown our bulk read */
        usb_kill_urb(port->read_urb);
        kref_put(&priv->kref, ftdi_sio_priv_release);
} /* ftdi_close */



/* The SIO requires the first byte to have:
 *  B0 1
 *  B1 0
 *  B2..7 length of message excluding byte 0
 *
 * The new devices do not require this byte
 */
static int ftdi_write(struct tty_struct *tty, struct usb_serial_port *port,
                           const unsigned char *buf, int count)
{ /* ftdi_write */
        struct ftdi_private *priv = usb_get_serial_port_data(port);
        struct urb *urb;
        unsigned char *buffer;
        int data_offset ;       /* will be 1 for the SIO and 0 otherwise */
        int status;
        int transfer_size;
        unsigned long flags;

        dbg("%s port %d, %d bytes", __func__, port->number, count);

        if (count == 0) {
                dbg("write request of 0 bytes");
                return 0;
        }
        spin_lock_irqsave(&priv->tx_lock, flags);
        if (priv->tx_outstanding_urbs > URB_UPPER_LIMIT) {
                spin_unlock_irqrestore(&priv->tx_lock, flags);
                dbg("%s - write limit hit", __func__);
                return 0;
        }
        priv->tx_outstanding_urbs++;
        spin_unlock_irqrestore(&priv->tx_lock, flags);

        data_offset = priv->write_offset;
        dbg("data_offset set to %d", data_offset);

        /* Determine total transfer size */
        transfer_size = count;
        if (data_offset > 0) {
                /* Original sio needs control bytes too... */
                transfer_size += (data_offset *
                                ((count + (priv->max_packet_size - 1 - data_offset)) /
                                 (priv->max_packet_size - data_offset)));
        }

        buffer = kmalloc(transfer_size, GFP_ATOMIC);
        if (!buffer) {
                dev_err(&port->dev,
                        "%s ran out of kernel memory for urb ...\n", __func__);
                count = -ENOMEM;
                goto error_no_buffer;
        }

        urb = usb_alloc_urb(0, GFP_ATOMIC);
        if (!urb) {
                dev_err(&port->dev, "%s - no more free urbs\n", __func__);
                count = -ENOMEM;
                goto error_no_urb;
        }

        /* Copy data */
        if (data_offset > 0) {
                /* Original sio requires control byte at start of
                   each packet. */
                int user_pktsz = priv->max_packet_size - data_offset;
                int todo = count;
                unsigned char *first_byte = buffer;
                const unsigned char *current_position = buf;

                while (todo > 0) {
                        if (user_pktsz > todo)
                                user_pktsz = todo;
                        /* Write the control byte at the front of the packet*/
                        *first_byte = 1 | ((user_pktsz) << 2);
                        /* Copy data for packet */
                        memcpy(first_byte + data_offset,
                                current_position, user_pktsz);
                        first_byte += user_pktsz + data_offset;
                        current_position += user_pktsz;
                        todo -= user_pktsz;
                }
        } else {
                /* No control byte required. */
                /* Copy in the data to send */
                memcpy(buffer, buf, count);
        }

        usb_serial_debug_data(debug, &port->dev, __func__,
                                                transfer_size, buffer);

        /* fill the buffer and send it */
        usb_fill_bulk_urb(urb, port->serial->dev,
                        usb_sndbulkpipe(port->serial->dev,
                                        port->bulk_out_endpointAddress),
                        buffer, transfer_size,
                        ftdi_write_bulk_callback, port);

        status = usb_submit_urb(urb, GFP_ATOMIC);
        if (status) {
                dev_err(&port->dev,
                        "%s - failed submitting write urb, error %d\n",
                        __func__, status);
                count = status;
                goto error;
        } else {
                spin_lock_irqsave(&priv->tx_lock, flags);
                priv->tx_outstanding_bytes += count;
                spin_unlock_irqrestore(&priv->tx_lock, flags);
        }

        /* we are done with this urb, so let the host driver
         * really free it when it is finished with it */
        usb_free_urb(urb);

        dbg("%s write returning: %d", __func__, count);
        return count;
error:
        usb_free_urb(urb);
error_no_urb:
        kfree(buffer);
error_no_buffer:
        spin_lock_irqsave(&priv->tx_lock, flags);
        priv->tx_outstanding_urbs--;
        spin_unlock_irqrestore(&priv->tx_lock, flags);
        return count;
} /* ftdi_write */


/* This function may get called when the device is closed */

static void ftdi_write_bulk_callback(struct urb *urb)
{
        unsigned long flags;
        struct usb_serial_port *port = urb->context;
        struct ftdi_private *priv;
        int data_offset;       /* will be 1 for the SIO and 0 otherwise */
        unsigned long countback;
        int status = urb->status;

        /* free up the transfer buffer, as usb_free_urb() does not do this */
        kfree(urb->transfer_buffer);

        dbg("%s - port %d", __func__, port->number);

        priv = usb_get_serial_port_data(port);
        if (!priv) {
                dbg("%s - bad port private data pointer - exiting", __func__);
                return;
        }
        /* account for transferred data */
        countback = urb->transfer_buffer_length;
        data_offset = priv->write_offset;
        if (data_offset > 0) {
                /* Subtract the control bytes */
                countback -= (data_offset * DIV_ROUND_UP(countback, priv->max_packet_size));
        }
        spin_lock_irqsave(&priv->tx_lock, flags);
        --priv->tx_outstanding_urbs;
        priv->tx_outstanding_bytes -= countback;
        spin_unlock_irqrestore(&priv->tx_lock, flags);

        if (status) {
                dbg("nonzero write bulk status received: %d", status);
        }

        usb_serial_port_softint(port);
} /* ftdi_write_bulk_callback */


static int ftdi_write_room(struct tty_struct *tty)
{
        struct usb_serial_port *port = tty->driver_data;
        struct ftdi_private *priv = usb_get_serial_port_data(port);
        int room;
        unsigned long flags;

        dbg("%s - port %d", __func__, port->number);

        spin_lock_irqsave(&priv->tx_lock, flags);
        if (priv->tx_outstanding_urbs < URB_UPPER_LIMIT) {
                /*
                 * We really can take anything the user throws at us
                 * but let's pick a nice big number to tell the tty
                 * layer that we have lots of free space
                 */
                room = 2048;
        } else {
                room = 0;
        }
        spin_unlock_irqrestore(&priv->tx_lock, flags);
        return room;
}

static int ftdi_chars_in_buffer(struct tty_struct *tty)
{
        struct usb_serial_port *port = tty->driver_data;
        struct ftdi_private *priv = usb_get_serial_port_data(port);
        int buffered;
        unsigned long flags;

        dbg("%s - port %d", __func__, port->number);

        spin_lock_irqsave(&priv->tx_lock, flags);
        buffered = (int)priv->tx_outstanding_bytes;
        spin_unlock_irqrestore(&priv->tx_lock, flags);
        if (buffered < 0) {
                dev_err(&port->dev, "%s outstanding tx bytes is negative!\n",
                        __func__);
                buffered = 0;
        }
        return buffered;
}

static int ftdi_process_packet(struct tty_struct *tty,
                struct usb_serial_port *port, struct ftdi_private *priv,
                char *packet, int len)
{
        int i;
        char status;
        char flag;
        char *ch;

        dbg("%s - port %d", __func__, port->number);

        if (len < 2) {
                dbg("malformed packet");
                return 0;
        }

        /* Compare new line status to the old one, signal if different/
           N.B. packet may be processed more than once, but differences
           are only processed once.  */
        status = packet[0] & FTDI_STATUS_B0_MASK;
        if (status != priv->prev_status) {
                priv->diff_status |= status ^ priv->prev_status;
                wake_up_interruptible(&priv->delta_msr_wait);
                priv->prev_status = status;
        }

        /*
         * Although the device uses a bitmask and hence can have multiple
         * errors on a packet - the order here sets the priority the error is
         * returned to the tty layer.
         */
        flag = TTY_NORMAL;
        if (packet[1] & FTDI_RS_OE) {
                flag = TTY_OVERRUN;
                dbg("OVERRRUN error");
        }
        if (packet[1] & FTDI_RS_BI) {
                flag = TTY_BREAK;
                dbg("BREAK received");
                usb_serial_handle_break(port);
        }
        if (packet[1] & FTDI_RS_PE) {
                flag = TTY_PARITY;
                dbg("PARITY error");
        }
        if (packet[1] & FTDI_RS_FE) {
                flag = TTY_FRAME;
                dbg("FRAMING error");
        }

        len -= 2;
        if (!len)
                return 0;       /* status only */
        ch = packet + 2;

        if (!(port->console && port->sysrq) && flag == TTY_NORMAL)
                tty_insert_flip_string(tty, ch, len);
        else {
                for (i = 0; i < len; i++, ch++) {
                        if (!usb_serial_handle_sysrq_char(tty, port, *ch))
                                tty_insert_flip_char(tty, *ch, flag);
                }
        }
        return len;
}

static void ftdi_process_read(struct usb_serial_port *port)
{
        struct urb *urb = port->read_urb;
        struct tty_struct *tty;
        struct ftdi_private *priv = usb_get_serial_port_data(port);
        char *data = (char *)urb->transfer_buffer;
        int i;
        int len;
        int count = 0;

        tty = tty_port_tty_get(&port->port);
        if (!tty)
                return;

        for (i = 0; i < urb->actual_length; i += priv->max_packet_size) {
                len = min_t(int, urb->actual_length - i, priv->max_packet_size);
                count += ftdi_process_packet(tty, port, priv, &data[i], len);
        }

        if (count)
                tty_flip_buffer_push(tty);
        tty_kref_put(tty);
}

static void ftdi_read_bulk_callback(struct urb *urb)
{
        struct usb_serial_port *port = urb->context;
        unsigned long flags;

        dbg("%s - port %d", __func__, port->number);

        if (urb->status) {
                dbg("%s - nonzero read bulk status received: %d",
                                                __func__, urb->status);
                return;
        }

        usb_serial_debug_data(debug, &port->dev, __func__,
                                urb->actual_length, urb->transfer_buffer);
        ftdi_process_read(port);

        spin_lock_irqsave(&port->lock, flags);
        port->throttled = port->throttle_req;
        if (!port->throttled) {
                spin_unlock_irqrestore(&port->lock, flags);
                ftdi_submit_read_urb(port, GFP_ATOMIC);
        } else
                spin_unlock_irqrestore(&port->lock, flags);
}

static void ftdi_break_ctl(struct tty_struct *tty, int break_state)
{
        struct usb_serial_port *port = tty->driver_data;
        struct ftdi_private *priv = usb_get_serial_port_data(port);
        __u16 urb_value;

        /* break_state = -1 to turn on break, and 0 to turn off break */
        /* see drivers/char/tty_io.c to see it used */
        /* last_set_data_urb_value NEVER has the break bit set in it */

        if (break_state)
                urb_value = priv->last_set_data_urb_value | FTDI_SIO_SET_BREAK;
        else
                urb_value = priv->last_set_data_urb_value;

        if (usb_control_msg(port->serial->dev,
                        usb_sndctrlpipe(port->serial->dev, 0),
                        FTDI_SIO_SET_DATA_REQUEST,
                        FTDI_SIO_SET_DATA_REQUEST_TYPE,
                        urb_value , priv->interface,
                        NULL, 0, WDR_TIMEOUT) < 0) {
                dev_err(&port->dev, "%s FAILED to enable/disable break state "
                        "(state was %d)\n", __func__, break_state);
        }

        dbg("%s break state is %d - urb is %d", __func__,
                                                break_state, urb_value);

}


/* old_termios contains the original termios settings and tty->termios contains
 * the new setting to be used
 * WARNING: set_termios calls this with old_termios in kernel space
 */

static void ftdi_set_termios(struct tty_struct *tty,
                struct usb_serial_port *port, struct ktermios *old_termios)
{ /* ftdi_termios */
        struct usb_device *dev = port->serial->dev;
        struct ftdi_private *priv = usb_get_serial_port_data(port);
        struct ktermios *termios = tty->termios;
        unsigned int cflag = termios->c_cflag;
        __u16 urb_value; /* will hold the new flags */

        /* Added for xon/xoff support */
        unsigned int iflag = termios->c_iflag;
        unsigned char vstop;
        unsigned char vstart;

        dbg("%s", __func__);

        /* Force baud rate if this device requires it, unless it is set to
           B0. */
        if (priv->force_baud && ((termios->c_cflag & CBAUD) != B0)) {
                dbg("%s: forcing baud rate for this device", __func__);
                tty_encode_baud_rate(tty, priv->force_baud,
                                        priv->force_baud);
        }

        /* Force RTS-CTS if this device requires it. */
        if (priv->force_rtscts) {
                dbg("%s: forcing rtscts for this device", __func__);
                termios->c_cflag |= CRTSCTS;
        }

        cflag = termios->c_cflag;

        /* FIXME -For this cut I don't care if the line is really changing or
           not  - so just do the change regardless  - should be able to
           compare old_termios and tty->termios */
        /* NOTE These routines can get interrupted by
           ftdi_sio_read_bulk_callback  - need to examine what this means -
           don't see any problems yet */

        /* Set number of data bits, parity, stop bits */

        urb_value = 0;
        urb_value |= (cflag & CSTOPB ? FTDI_SIO_SET_DATA_STOP_BITS_2 :
                      FTDI_SIO_SET_DATA_STOP_BITS_1);
        if (cflag & PARENB) {
                if (cflag & CMSPAR)
                        urb_value |= cflag & PARODD ?
                                     FTDI_SIO_SET_DATA_PARITY_MARK :
                                     FTDI_SIO_SET_DATA_PARITY_SPACE;
                else
                        urb_value |= cflag & PARODD ?
                                     FTDI_SIO_SET_DATA_PARITY_ODD :
                                     FTDI_SIO_SET_DATA_PARITY_EVEN;
        } else {
                urb_value |= FTDI_SIO_SET_DATA_PARITY_NONE;
        }
        if (cflag & CSIZE) {
                switch (cflag & CSIZE) {
                case CS7: urb_value |= 7; dbg("Setting CS7"); break;
                case CS8: urb_value |= 8; dbg("Setting CS8"); break;
                default:
                        dev_err(&port->dev, "CSIZE was set but not CS7-CS8\n");
                }
        }

        /* This is needed by the break command since it uses the same command
           - but is or'ed with this value  */
        priv->last_set_data_urb_value = urb_value;

        if (usb_control_msg(dev, usb_sndctrlpipe(dev, 0),
                            FTDI_SIO_SET_DATA_REQUEST,
                            FTDI_SIO_SET_DATA_REQUEST_TYPE,
                            urb_value , priv->interface,
                            NULL, 0, WDR_SHORT_TIMEOUT) < 0) {
                dev_err(&port->dev, "%s FAILED to set "
                        "databits/stopbits/parity\n", __func__);
        }

        /* Now do the baudrate */
        if ((cflag & CBAUD) == B0) {
                /* Disable flow control */
                if (usb_control_msg(dev, usb_sndctrlpipe(dev, 0),
                                    FTDI_SIO_SET_FLOW_CTRL_REQUEST,
                                    FTDI_SIO_SET_FLOW_CTRL_REQUEST_TYPE,
                                    0, priv->interface,
                                    NULL, 0, WDR_TIMEOUT) < 0) {
                        dev_err(&port->dev,
                                "%s error from disable flowcontrol urb\n",
                                __func__);
                }
                /* Drop RTS and DTR */
                clear_mctrl(port, TIOCM_DTR | TIOCM_RTS);
        } else {
                /* set the baudrate determined before */
                mutex_lock(&priv->cfg_lock);
                if (change_speed(tty, port))
                        dev_err(&port->dev, "%s urb failed to set baudrate\n",
                                __func__);
                mutex_unlock(&priv->cfg_lock);
                /* Ensure RTS and DTR are raised when baudrate changed from 0 */
                if (!old_termios || (old_termios->c_cflag & CBAUD) == B0)
                        set_mctrl(port, TIOCM_DTR | TIOCM_RTS);
        }

        /* Set flow control */
        /* Note device also supports DTR/CD (ugh) and Xon/Xoff in hardware */
        if (cflag & CRTSCTS) {
                dbg("%s Setting to CRTSCTS flow control", __func__);
                if (usb_control_msg(dev,
                                    usb_sndctrlpipe(dev, 0),
                                    FTDI_SIO_SET_FLOW_CTRL_REQUEST,
                                    FTDI_SIO_SET_FLOW_CTRL_REQUEST_TYPE,
                                    0 , (FTDI_SIO_RTS_CTS_HS | priv->interface),
                                    NULL, 0, WDR_TIMEOUT) < 0) {
                        dev_err(&port->dev,
                                "urb failed to set to rts/cts flow control\n");
                }

                /* raise DTR/RTS */
                set_mctrl(port, TIOCM_DTR | TIOCM_RTS);
        } else {
                /*
                 * Xon/Xoff code
                 *
                 * Check the IXOFF status in the iflag component of the
                 * termios structure. If IXOFF is not set, the pre-xon/xoff
                 * code is executed.
                 */
                if (iflag & IXOFF) {
                        dbg("%s  request to enable xonxoff iflag=%04x",
                                                        __func__, iflag);
                        /* Try to enable the XON/XOFF on the ftdi_sio
                         * Set the vstart and vstop -- could have been done up
                         * above where a lot of other dereferencing is done but
                         * that would be very inefficient as vstart and vstop
                         * are not always needed.
                         */
                        vstart = termios->c_cc[VSTART];
                        vstop = termios->c_cc[VSTOP];
                        urb_value = (vstop << 8) | (vstart);

                        if (usb_control_msg(dev,
                                            usb_sndctrlpipe(dev, 0),
                                            FTDI_SIO_SET_FLOW_CTRL_REQUEST,
                                            FTDI_SIO_SET_FLOW_CTRL_REQUEST_TYPE,
                                            urb_value , (FTDI_SIO_XON_XOFF_HS
                                                         | priv->interface),
                                            NULL, 0, WDR_TIMEOUT) < 0) {
                                dev_err(&port->dev, "urb failed to set to "
                                        "xon/xoff flow control\n");
                        }
                } else {
                        /* else clause to only run if cflag ! CRTSCTS and iflag
                         * ! XOFF. CHECKME Assuming XON/XOFF handled by tty
                         * stack - not by device */
                        dbg("%s Turning off hardware flow control", __func__);
                        if (usb_control_msg(dev,
                                            usb_sndctrlpipe(dev, 0),
                                            FTDI_SIO_SET_FLOW_CTRL_REQUEST,
                                            FTDI_SIO_SET_FLOW_CTRL_REQUEST_TYPE,
                                            0, priv->interface,
                                            NULL, 0, WDR_TIMEOUT) < 0) {
                                dev_err(&port->dev,
                                        "urb failed to clear flow control\n");
                        }
                }

                /* lower DTR/RTS */
                clear_mctrl(port, TIOCM_DTR | TIOCM_RTS);
        }
        return;
}

static int ftdi_tiocmget(struct tty_struct *tty, struct file *file)
{
        struct usb_serial_port *port = tty->driver_data;
        struct ftdi_private *priv = usb_get_serial_port_data(port);
        unsigned char *buf;
        int len;
        int ret;

        dbg("%s TIOCMGET", __func__);

        buf = kmalloc(2, GFP_KERNEL);
        if (!buf)
                return -ENOMEM;
        /*
         * The 8U232AM returns a two byte value (the SIO a 1 byte value) in
         * the same format as the data returned from the in point.
         */
        switch (priv->chip_type) {
        case SIO:
                len = 1;
                break;
        case FT8U232AM:
        case FT232BM:
        case FT2232C:
        case FT232RL:
        case FT2232H:
        case FT4232H:
                len = 2;
                break;
        default:
                ret = -EFAULT;
                goto out;
        }

        ret = usb_control_msg(port->serial->dev,
                        usb_rcvctrlpipe(port->serial->dev, 0),
                        FTDI_SIO_GET_MODEM_STATUS_REQUEST,
                        FTDI_SIO_GET_MODEM_STATUS_REQUEST_TYPE,
                        0, priv->interface,
                        buf, len, WDR_TIMEOUT);
        if (ret < 0)
                goto out;

        ret = (buf[0] & FTDI_SIO_DSR_MASK ? TIOCM_DSR : 0) |
                (buf[0] & FTDI_SIO_CTS_MASK ? TIOCM_CTS : 0) |
                (buf[0]  & FTDI_SIO_RI_MASK  ? TIOCM_RI  : 0) |
                (buf[0]  & FTDI_SIO_RLSD_MASK ? TIOCM_CD  : 0) |
                priv->last_dtr_rts;
out:
        kfree(buf);
        return ret;
}

static int ftdi_tiocmset(struct tty_struct *tty, struct file *file,
                        unsigned int set, unsigned int clear)
{
        struct usb_serial_port *port = tty->driver_data;
        dbg("%s TIOCMSET", __func__);
        return update_mctrl(port, set, clear);
}


static int ftdi_ioctl(struct tty_struct *tty, struct file *file,
                                        unsigned int cmd, unsigned long arg)
{
        struct usb_serial_port *port = tty->driver_data;
        struct ftdi_private *priv = usb_get_serial_port_data(port);

        dbg("%s cmd 0x%04x", __func__, cmd);

        /* Based on code from acm.c and others */
        switch (cmd) {

        case TIOCGSERIAL: /* gets serial port data */
                return get_serial_info(port,
                                        (struct serial_struct __user *) arg);

        case TIOCSSERIAL: /* sets serial port data */
                return set_serial_info(tty, port,
                                        (struct serial_struct __user *) arg);

        /*
         * Wait for any of the 4 modem inputs (DCD,RI,DSR,CTS) to change
         * - mask passed in arg for lines of interest
         *   (use |'ed TIOCM_RNG/DSR/CD/CTS for masking)
         * Caller should use TIOCGICOUNT to see which one it was.
         *
         * This code is borrowed from linux/drivers/char/serial.c
         */
        case TIOCMIWAIT:
                while (priv != NULL) {
                        interruptible_sleep_on(&priv->delta_msr_wait);
                        /* see if a signal did it */
                        if (signal_pending(current))
                                return -ERESTARTSYS;
                        else {
                                char diff = priv->diff_status;

                                if (diff == 0)
                                        return -EIO; /* no change => error */

                                /* Consume all events */
                                priv->diff_status = 0;

                                /* Return 0 if caller wanted to know about
                                   these bits */
                                if (((arg & TIOCM_RNG) && (diff & FTDI_RS0_RI)) ||
                                    ((arg & TIOCM_DSR) && (diff & FTDI_RS0_DSR)) ||
                                    ((arg & TIOCM_CD)  && (diff & FTDI_RS0_RLSD)) ||
                                    ((arg & TIOCM_CTS) && (diff & FTDI_RS0_CTS))) {
                                        return 0;
                                }
                                /*
                                 * Otherwise caller can't care less about what
                                 * happened,and so we continue to wait for more
                                 * events.
                                 */
                        }
                }
                return 0;
        default:
                break;
        }
        /* This is not necessarily an error - turns out the higher layers
         * will do some ioctls themselves (see comment above)
         */
        dbg("%s arg not supported - it was 0x%04x - check /usr/include/asm/ioctls.h", __func__, cmd);
        return -ENOIOCTLCMD;
}

static void ftdi_throttle(struct tty_struct *tty)
{
        struct usb_serial_port *port = tty->driver_data;
        unsigned long flags;

        dbg("%s - port %d", __func__, port->number);

        spin_lock_irqsave(&port->lock, flags);
        port->throttle_req = 1;
        spin_unlock_irqrestore(&port->lock, flags);
}

void ftdi_unthrottle(struct tty_struct *tty)
{
        struct usb_serial_port *port = tty->driver_data;
        int was_throttled;
        unsigned long flags;

        dbg("%s - port %d", __func__, port->number);

        spin_lock_irqsave(&port->lock, flags);
        was_throttled = port->throttled;
        port->throttled = port->throttle_req = 0;
        spin_unlock_irqrestore(&port->lock, flags);

        if (was_throttled)
                ftdi_submit_read_urb(port, GFP_KERNEL);
}

static int __init ftdi_init(void)
{
        int retval;

        dbg("%s", __func__);
        if (vendor > 0 && product > 0) {
                /* Add user specified VID/PID to reserved element of table. */
                int i;
                for (i = 0; id_table_combined[i].idVendor; i++)
                        ;
                id_table_combined[i].match_flags = USB_DEVICE_ID_MATCH_DEVICE;
                id_table_combined[i].idVendor = vendor;
                id_table_combined[i].idProduct = product;
        }
        retval = usb_serial_register(&ftdi_sio_device);
        if (retval)
                goto failed_sio_register;
        retval = usb_register(&ftdi_driver);
        if (retval)
                goto failed_usb_register;

        printk(KERN_INFO KBUILD_MODNAME ": " DRIVER_VERSION ":"
               DRIVER_DESC "\n");
        return 0;
failed_usb_register:
        usb_serial_deregister(&ftdi_sio_device);
failed_sio_register:
        return retval;
}


static void __exit ftdi_exit(void)
{

        dbg("%s", __func__);

        usb_deregister(&ftdi_driver);
        usb_serial_deregister(&ftdi_sio_device);

}


module_init(ftdi_init);
module_exit(ftdi_exit);

MODULE_AUTHOR(DRIVER_AUTHOR);
MODULE_DESCRIPTION(DRIVER_DESC);
MODULE_LICENSE("GPL");

module_param(debug, bool, S_IRUGO | S_IWUSR);
MODULE_PARM_DESC(debug, "Debug enabled or not");
module_param(vendor, ushort, 0);
MODULE_PARM_DESC(vendor, "User specified vendor ID (default="
                __MODULE_STRING(FTDI_VID)")");
module_param(product, ushort, 0);
MODULE_PARM_DESC(product, "User specified product ID");

module_param(ndi_latency_timer, int, S_IRUGO | S_IWUSR);
MODULE_PARM_DESC(ndi_latency_timer, "NDI device latency timer override");