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ftdi_sio.c

/*
 * 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/smp_lock.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/uaccess.h>
#include <linux/usb.h>
#include <linux/serial.h>
#include <linux/usb/serial.h>
#include "ftdi_sio.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>"
#define DRIVER_DESC "USB FTDI Serial Converters Driver"

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

00059 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 */
      __u8 rx_flags;          /* receive state flags (throttling) */
      spinlock_t rx_lock;     /* spinlock for receive state */
      struct delayed_work rx_work;
      struct usb_serial_port *port;
      int rx_processed;
      unsigned long rx_bytes;

      __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_bytes;
      unsigned long tx_outstanding_bytes;
      unsigned long tx_outstanding_urbs;
      unsigned short max_packet_size;
};

/* struct ftdi_sio_quirk is used by devices requiring special attention. */
00103 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]
 */



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_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(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) },
      /*
       * Due to many user requests for multiple ELV devices we enable
       * them by default.
       */
      { 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_WS300PC_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, 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(BANDB_VID, BANDB_USOTL4_PID) },
      { USB_DEVICE(BANDB_VID, BANDB_USTL4_PID) },
      { USB_DEVICE(BANDB_VID, BANDB_USO9ML2_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(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(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(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 },
      { },                          /* 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

/* rx_flags */
#define THROTTLED       0x01
#define ACTUALLY_THROTTLED    0x02

/* 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, struct file *filp);
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 work_struct *work);
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);
      char *buf;
      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 */
      }

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

      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,
                         buf, 0, WDR_TIMEOUT);

      kfree(buf);
      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);
      char *buf;
      __u16 urb_value;
      __u16 urb_index;
      __u32 urb_index_value;
      int rv;

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

      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,
                      buf, 0, WDR_SHORT_TIMEOUT);

      kfree(buf);
      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;
      char buf[1];
      int rv = 0;
      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,
                       buf, 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 short latency = 0;
      int rv = 0;


      dbg("%s", __func__);

      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,
                       (char *) &latency, 1, WDR_TIMEOUT);

      if (rv < 0) {
            dev_err(&port->dev, "Unable to read latency timer: %i\n", rv);
            return -EIO;
      }
      return latency;
}

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;

      lock_kernel();
      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))) {
                  unlock_kernel();
                  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)) {
            unlock_kernel();
            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;

      tty->low_latency = (priv->flags & ASYNC_LOW_LATENCY) ? 1 : 0;
      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))) {
            unlock_kernel();
            change_speed(tty, port);
      }
      else
            unlock_kernel();
      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 its the original SIO. */
            priv->chip_type = SIO;
            priv->baud_base = 12000000 / 16;
            priv->write_offset = 1;
      } else if (version < 0x400) {
            /* Assume its 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 its an FT232BM (or FT245BM) */
            priv->chip_type = FT232BM;
      } else {
            /* Assume its 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 = 0;

      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 = 0;

      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;
      char buf[1];
      int v = simple_strtoul(valbuf, NULL, 10);
      int rv = 0;

      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,
                       buf, 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->rx_lock);
      spin_lock_init(&priv->tx_lock);
      init_waitqueue_head(&priv->delta_msr_wait);
      /* This will push the characters through immediately rather
         than queue a task to deliver them */
      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;
      }

      INIT_DELAYED_WORK(&priv->rx_work, ftdi_process_read);
      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);
      read_latency_timer(port);
      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;
      int rv = 0;
      char buf[1];

      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);

      rv = usb_control_msg(udev, usb_sndctrlpipe(udev, 0),
                        FTDI_SIO_SET_LATENCY_TIMER_REQUEST,
                        FTDI_SIO_SET_LATENCY_TIMER_REQUEST_TYPE,
                        latency, 0, buf, 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_open(struct tty_struct *tty,
                  struct usb_serial_port *port, struct file *filp)
{ /* ftdi_open */
      struct usb_device *dev = port->serial->dev;
      struct ftdi_private *priv = usb_get_serial_port_data(port);
      unsigned long flags;

      int result = 0;
      char buf[1]; /* Needed for the usb_control_msg I think */

      dbg("%s", __func__);

      spin_lock_irqsave(&priv->tx_lock, flags);
      priv->tx_bytes = 0;
      spin_unlock_irqrestore(&priv->tx_lock, flags);
      spin_lock_irqsave(&priv->rx_lock, flags);
      priv->rx_bytes = 0;
      spin_unlock_irqrestore(&priv->rx_lock, flags);

      if (tty)
            tty->low_latency = (priv->flags & ASYNC_LOW_LATENCY) ? 1 : 0;

      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, buf, 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(&priv->rx_lock, flags);
      priv->rx_flags &= ~(THROTTLED | ACTUALLY_THROTTLED);
      spin_unlock_irqrestore(&priv->rx_lock, flags);

      /* Start reading from the device */
      priv->rx_processed = 0;
      usb_fill_bulk_urb(port->read_urb, dev,
                  usb_rcvbulkpipe(dev, port->bulk_in_endpointAddress),
                  port->read_urb->transfer_buffer,
                        port->read_urb->transfer_buffer_length,
                  ftdi_read_bulk_callback, port);
      result = usb_submit_urb(port->read_urb, GFP_KERNEL);
      if (result)
            dev_err(&port->dev,
                  "%s - failed submitting read urb, error %d\n",
                  __func__, result);
      else
            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);
      char buf[1];

      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, buf, 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__);


      /* cancel any scheduled reading */
      cancel_delayed_work_sync(&priv->rx_work);

      /* 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\n", __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;
            priv->tx_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->actual_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);
            return;
      }

      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 void ftdi_read_bulk_callback(struct urb *urb)
{
      struct usb_serial_port *port = urb->context;
      struct tty_struct *tty;
      struct ftdi_private *priv;
      unsigned long countread;
      unsigned long flags;
      int status = urb->status;

      if (urb->number_of_packets > 0) {
            dev_err(&port->dev, "%s transfer_buffer_length %d "
                  "actual_length %d number of packets %d\n", __func__,
                  urb->transfer_buffer_length,
                  urb->actual_length, urb->number_of_packets);
            dev_err(&port->dev, "%s transfer_flags %x\n", __func__,
                  urb->transfer_flags);
      }

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

      if (port->port.count <= 0)
            return;

      tty = tty_port_tty_get(&port->port);
      if (!tty) {
            dbg("%s - bad tty pointer - exiting", __func__);
            return;
      }

      priv = usb_get_serial_port_data(port);
      if (!priv) {
            dbg("%s - bad port private data pointer - exiting", __func__);
            goto out;
      }

      if (urb != port->read_urb)
            dev_err(&port->dev, "%s - Not my urb!\n", __func__);

      if (status) {
            /* This will happen at close every time so it is a dbg not an
               err */
            dbg("(this is ok on close) nonzero read bulk status received: %d", status);
            goto out;
      }

      /* count data bytes, but not status bytes */
      countread = urb->actual_length;
      countread -= 2 * DIV_ROUND_UP(countread, priv->max_packet_size);
      spin_lock_irqsave(&priv->rx_lock, flags);
      priv->rx_bytes += countread;
      spin_unlock_irqrestore(&priv->rx_lock, flags);

      ftdi_process_read(&priv->rx_work.work);
out:
      tty_kref_put(tty);
} /* ftdi_read_bulk_callback */


static void ftdi_process_read(struct work_struct *work)
{ /* ftdi_process_read */
      struct ftdi_private *priv =
            container_of(work, struct ftdi_private, rx_work.work);
      struct usb_serial_port *port = priv->port;
      struct urb *urb;
      struct tty_struct *tty;
      char error_flag;
      unsigned char *data;

      int i;
      int result;
      int need_flip;
      int packet_offset;
      unsigned long flags;

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

      if (port->port.count <= 0)
            return;

      tty = tty_port_tty_get(&port->port);
      if (!tty) {
            dbg("%s - bad tty pointer - exiting", __func__);
            return;
      }

      priv = usb_get_serial_port_data(port);
      if (!priv) {
            dbg("%s - bad port private data pointer - exiting", __func__);
            goto out;
      }

      urb = port->read_urb;
      if (!urb) {
            dbg("%s - bad read_urb pointer - exiting", __func__);
            goto out;
      }

      data = urb->transfer_buffer;

      if (priv->rx_processed) {
            dbg("%s - already processed: %d bytes, %d remain", __func__,
                        priv->rx_processed,
                        urb->actual_length - priv->rx_processed);
      } else {
            /* The first two bytes of every read packet are status */
            if (urb->actual_length > 2)
                  usb_serial_debug_data(debug, &port->dev, __func__,
                                    urb->actual_length, data);
            else
                  dbg("Status only: %03oo %03oo", data[0], data[1]);
      }


      /* TO DO -- check for hung up line and handle appropriately: */
      /*   send hangup  */
      /* See acm.c - you do a tty_hangup  - eg tty_hangup(tty) */
      /* if CD is dropped and the line is not CLOCAL then we should hangup */

      need_flip = 0;
      for (packet_offset = priv->rx_processed;
            packet_offset < urb->actual_length; packet_offset += priv->max_packet_size) {
            int length;

            /* 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.  */
            char new_status = data[packet_offset + 0] &
                                    FTDI_STATUS_B0_MASK;
            if (new_status != priv->prev_status) {
                  priv->diff_status |=
                        new_status ^ priv->prev_status;
                  wake_up_interruptible(&priv->delta_msr_wait);
                  priv->prev_status = new_status;
            }

            length = min_t(u32, priv->max_packet_size, urb->actual_length-packet_offset)-2;
            if (length < 0) {
                  dev_err(&port->dev, "%s - bad packet length: %d\n",
                        __func__, length+2);
                  length = 0;
            }

            if (priv->rx_flags & THROTTLED) {
                  dbg("%s - throttled", __func__);
                  break;
            }
            if (tty_buffer_request_room(tty, length) < length) {
                  /* break out & wait for throttling/unthrottling to
                     happen */
                  dbg("%s - receive room low", __func__);
                  break;
            }

            /* Handle errors and break */
            error_flag = TTY_NORMAL;
            /* 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  */

            if (data[packet_offset+1] & FTDI_RS_OE) {
                  error_flag = TTY_OVERRUN;
                  dbg("OVERRRUN error");
            }
            if (data[packet_offset+1] & FTDI_RS_BI) {
                  error_flag = TTY_BREAK;
                  dbg("BREAK received");
                  usb_serial_handle_break(port);
            }
            if (data[packet_offset+1] & FTDI_RS_PE) {
                  error_flag = TTY_PARITY;
                  dbg("PARITY error");
            }
            if (data[packet_offset+1] & FTDI_RS_FE) {
                  error_flag = TTY_FRAME;
                  dbg("FRAMING error");
            }
            if (length > 0) {
                  for (i = 2; i < length+2; i++) {
                        /* Note that the error flag is duplicated for
                           every character received since we don't know
                           which character it applied to */
                        if (!usb_serial_handle_sysrq_char(tty, port,
                                    data[packet_offset + i]))
                              tty_insert_flip_char(tty,
                                    data[packet_offset + i],
                                    error_flag);
                  }
                  need_flip = 1;
            }

#ifdef NOT_CORRECT_BUT_KEEPING_IT_FOR_NOW
            /* if a parity error is detected you get status packets forever
               until a character is sent without a parity error.
               This doesn't work well since the application receives a
               never ending stream of bad data - even though new data
               hasn't been sent. Therefore I (bill) have taken this out.
               However - this might make sense for framing errors and so on
               so I am leaving the code in for now.
            */
            else {
                  if (error_flag != TTY_NORMAL) {
                        dbg("error_flag is not normal");
                        /* In this case it is just status - if that is
                           an error send a bad character */
                        if (tty->flip.count >= TTY_FLIPBUF_SIZE)
                              tty_flip_buffer_push(tty);
                        tty_insert_flip_char(tty, 0xff, error_flag);
                        need_flip = 1;
                  }
            }
#endif
      } /* "for(packet_offset=0..." */

      /* Low latency */
      if (need_flip)
            tty_flip_buffer_push(tty);

      if (packet_offset < urb->actual_length) {
            /* not completely processed - record progress */
            priv->rx_processed = packet_offset;
            dbg("%s - incomplete, %d bytes processed, %d remain",
                        __func__, packet_offset,
                        urb->actual_length - packet_offset);
            /* check if we were throttled while processing */
            spin_lock_irqsave(&priv->rx_lock, flags);
            if (priv->rx_flags & THROTTLED) {
                  priv->rx_flags |= ACTUALLY_THROTTLED;
                  spin_unlock_irqrestore(&priv->rx_lock, flags);
                  dbg("%s - deferring remainder until unthrottled",
                              __func__);
                  goto out;
            }
            spin_unlock_irqrestore(&priv->rx_lock, flags);
            /* if the port is closed stop trying to read */
            if (port->port.count > 0)
                  /* delay processing of remainder */
                  schedule_delayed_work(&priv->rx_work, 1);
            else
                  dbg("%s - port is closed", __func__);
            goto out;
      }

      /* urb is completely processed */
      priv->rx_processed = 0;

      /* if the port is closed stop trying to read */
      if (port->port.count > 0) {
            /* Continue trying to always read  */
            usb_fill_bulk_urb(port->read_urb, port->serial->dev,
                  usb_rcvbulkpipe(port->serial->dev,
                              port->bulk_in_endpointAddress),
                  port->read_urb->transfer_buffer,
                  port->read_urb->transfer_buffer_length,
                  ftdi_read_bulk_callback, port);

            result = usb_submit_urb(port->read_urb, GFP_ATOMIC);
            if (result)
                  dev_err(&port->dev,
                        "%s - failed resubmitting read urb, error %d\n",
                        __func__, result);
      }
out:
      tty_kref_put(tty);
} /* ftdi_process_read */


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 = 0;
      char buf[1];

      /* 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,
                  buf, 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 */
      char buf[1]; /* Perhaps I should dynamically alloc this? */

      /* 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 */

      termios->c_cflag &= ~CMSPAR;

      urb_value = 0;
      urb_value |= (cflag & CSTOPB ? FTDI_SIO_SET_DATA_STOP_BITS_2 :
                  FTDI_SIO_SET_DATA_STOP_BITS_1);
      urb_value |= (cflag & PARENB ?
                  (cflag & PARODD ? FTDI_SIO_SET_DATA_PARITY_ODD :
                   FTDI_SIO_SET_DATA_PARITY_EVEN) :
                  FTDI_SIO_SET_DATA_PARITY_NONE);
      if (cflag & CSIZE) {
            switch (cflag & CSIZE) {
            case CS5: urb_value |= 5; dbg("Setting CS5"); break;
            case CS6: urb_value |= 6; dbg("Setting CS6"); break;
            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 CS5-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,
                      buf, 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,
                            buf, 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 */
            if (change_speed(tty, port))
                  dev_err(&port->dev, "%s urb failed to set baudrate\n",
                        __func__);
            /* 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),
                            buf, 0, WDR_TIMEOUT) < 0) {
                  dev_err(&port->dev,
                        "urb failed to set to rts/cts flow control\n");
            }

      } 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),
                                  buf, 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,
                                  buf, 0, WDR_TIMEOUT) < 0) {
                        dev_err(&port->dev,
                              "urb failed to clear flow control\n");
                  }
            }

      }
      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[2];
      int ret;

      dbg("%s TIOCMGET", __func__);
      switch (priv->chip_type) {
      case SIO:
            /* Request the status from the device */
            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, 0,
                     buf, 1, WDR_TIMEOUT);
            if (ret < 0)
                  return ret;
            break;
      case FT8U232AM:
      case FT232BM:
      case FT2232C:
      case FT232RL:
      case FT2232H:
      case FT4232H:
            /* the 8U232AM returns a two byte value (the sio is a 1 byte
               value) - in the same format as the data returned from the in
               point */
            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, 2, WDR_TIMEOUT);
            if (ret < 0)
                  return ret;
            break;
      default:
            return -EFAULT;
      }

      return  (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;
}

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;
      struct ftdi_private *priv = usb_get_serial_port_data(port);
      unsigned long flags;

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

      spin_lock_irqsave(&priv->rx_lock, flags);
      priv->rx_flags |= THROTTLED;
      spin_unlock_irqrestore(&priv->rx_lock, flags);
}


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

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

      spin_lock_irqsave(&priv->rx_lock, flags);
      actually_throttled = priv->rx_flags & ACTUALLY_THROTTLED;
      priv->rx_flags &= ~(THROTTLED | ACTUALLY_THROTTLED);
      spin_unlock_irqrestore(&priv->rx_lock, flags);

      if (actually_throttled)
            schedule_delayed_work(&priv->rx_work, 0);
}

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");

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