/*
  Keyspan USB to Serial Converter driver

  (C) Copyright (C) 2000-2001   Hugh Blemings <hugh@blemings.org>
  (C) Copyright (C) 2002        Greg Kroah-Hartman <greg@kroah.com>

  This program is free software; you can redistribute it and/or modify
  it under the terms of the GNU General Public License as published by
  the Free Software Foundation; either version 2 of the License, or
  (at your option) any later version.

  See http://blemings.org/hugh/keyspan.html for more information.

  Code in this driver inspired by and in a number of places taken
  from Brian Warner's original Keyspan-PDA driver.

  This driver has been put together with the support of Innosys, Inc.
  and Keyspan, Inc the manufacturers of the Keyspan USB-serial products.
  Thanks Guys :)

  Thanks to Paulus for miscellaneous tidy ups, some largish chunks
  of much nicer and/or completely new code and (perhaps most uniquely)
  having the patience to sit down and explain why and where he'd changed
  stuff.

  Tip 'o the hat to IBM (and previously Linuxcare :) for supporting
  staff in their work on open source projects.
*/


#include <linux/kernel.h>
#include <linux/jiffies.h>
#include <linux/errno.h>
#include <linux/init.h>
#include <linux/slab.h>
#include <linux/tty.h>
#include <linux/tty_driver.h>
#include <linux/tty_flip.h>
#include <linux/module.h>
#include <linux/spinlock.h>
#include <linux/uaccess.h>
#include <linux/usb.h>
#include <linux/usb/serial.h>
#include <linux/usb/ezusb.h>
#include "keyspan.h"

#define DRIVER_AUTHOR "Hugh Blemings <hugh@misc.nu"
#define DRIVER_DESC "Keyspan USB to Serial Converter Driver"

#define INSTAT_BUFLEN   32
#define GLOCONT_BUFLEN  64
#define INDAT49W_BUFLEN 512

        /* Per device and per port private data */
struct keyspan_serial_private {
        const struct keyspan_device_details     *device_details;

        struct urb      *instat_urb;
        char            instat_buf[INSTAT_BUFLEN];

        /* added to support 49wg, where data from all 4 ports comes in
           on 1 EP and high-speed supported */
        struct urb      *indat_urb;
        char            indat_buf[INDAT49W_BUFLEN];

        /* XXX this one probably will need a lock */
        struct urb      *glocont_urb;
        char            glocont_buf[GLOCONT_BUFLEN];
        char            ctrl_buf[8];    /* for EP0 control message */
};

struct keyspan_port_private {
        /* Keep track of which input & output endpoints to use */
        int             in_flip;
        int             out_flip;

        /* Keep duplicate of device details in each port
           structure as well - simplifies some of the
           callback functions etc. */
        const struct keyspan_device_details     *device_details;

        /* Input endpoints and buffer for this port */
        struct urb      *in_urbs[2];
        char            in_buffer[2][64];
        /* Output endpoints and buffer for this port */
        struct urb      *out_urbs[2];
        char            out_buffer[2][64];

        /* Input ack endpoint */
        struct urb      *inack_urb;
        char            inack_buffer[1];

        /* Output control endpoint */
        struct urb      *outcont_urb;
        char            outcont_buffer[64];

        /* Settings for the port */
        int             baud;
        int             old_baud;
        unsigned int    cflag;
        unsigned int    old_cflag;
        enum            {flow_none, flow_cts, flow_xon} flow_control;
        int             rts_state;      /* Handshaking pins (outputs) */
        int             dtr_state;
        int             cts_state;      /* Handshaking pins (inputs) */
        int             dsr_state;
        int             dcd_state;
        int             ri_state;
        int             break_on;

        unsigned long   tx_start_time[2];
        int             resend_cont;    /* need to resend control packet */
};

/* Include Keyspan message headers.  All current Keyspan Adapters
   make use of one of five message formats which are referred
   to as USA-26, USA-28, USA-49, USA-90, USA-67 by Keyspan and
   within this driver. */
#include "keyspan_usa26msg.h"
#include "keyspan_usa28msg.h"
#include "keyspan_usa49msg.h"
#include "keyspan_usa90msg.h"
#include "keyspan_usa67msg.h"


module_usb_serial_driver(serial_drivers, keyspan_ids_combined);

static void keyspan_break_ctl(struct tty_struct *tty, int break_state)
{
        struct usb_serial_port *port = tty->driver_data;
        struct keyspan_port_private     *p_priv;

        p_priv = usb_get_serial_port_data(port);

        if (break_state == -1)
                p_priv->break_on = 1;
        else
                p_priv->break_on = 0;

        keyspan_send_setup(port, 0);
}


static void keyspan_set_termios(struct tty_struct *tty,
                struct usb_serial_port *port, struct ktermios *old_termios)
{
        int                             baud_rate, device_port;
        struct keyspan_port_private     *p_priv;
        const struct keyspan_device_details     *d_details;
        unsigned int                    cflag;

        p_priv = usb_get_serial_port_data(port);
        d_details = p_priv->device_details;
        cflag = tty->termios.c_cflag;
        device_port = port->number - port->serial->minor;

        /* Baud rate calculation takes baud rate as an integer
           so other rates can be generated if desired. */
        baud_rate = tty_get_baud_rate(tty);
        /* If no match or invalid, don't change */
        if (d_details->calculate_baud_rate(port, baud_rate, d_details->baudclk,
                                NULL, NULL, NULL, device_port) == KEYSPAN_BAUD_RATE_OK) {
                /* FIXME - more to do here to ensure rate changes cleanly */
                /* FIXME - calcuate exact rate from divisor ? */
                p_priv->baud = baud_rate;
        } else
                baud_rate = tty_termios_baud_rate(old_termios);

        tty_encode_baud_rate(tty, baud_rate, baud_rate);
        /* set CTS/RTS handshake etc. */
        p_priv->cflag = cflag;
        p_priv->flow_control = (cflag & CRTSCTS) ? flow_cts : flow_none;

        /* Mark/Space not supported */
        tty->termios.c_cflag &= ~CMSPAR;

        keyspan_send_setup(port, 0);
}

static int keyspan_tiocmget(struct tty_struct *tty)
{
        struct usb_serial_port *port = tty->driver_data;
        struct keyspan_port_private *p_priv = usb_get_serial_port_data(port);
        unsigned int                    value;

        value = ((p_priv->rts_state) ? TIOCM_RTS : 0) |
                ((p_priv->dtr_state) ? TIOCM_DTR : 0) |
                ((p_priv->cts_state) ? TIOCM_CTS : 0) |
                ((p_priv->dsr_state) ? TIOCM_DSR : 0) |
                ((p_priv->dcd_state) ? TIOCM_CAR : 0) |
                ((p_priv->ri_state) ? TIOCM_RNG : 0);

        return value;
}

static int keyspan_tiocmset(struct tty_struct *tty,
                            unsigned int set, unsigned int clear)
{
        struct usb_serial_port *port = tty->driver_data;
        struct keyspan_port_private *p_priv = usb_get_serial_port_data(port);

        if (set & TIOCM_RTS)
                p_priv->rts_state = 1;
        if (set & TIOCM_DTR)
                p_priv->dtr_state = 1;
        if (clear & TIOCM_RTS)
                p_priv->rts_state = 0;
        if (clear & TIOCM_DTR)
                p_priv->dtr_state = 0;
        keyspan_send_setup(port, 0);
        return 0;
}

/* Write function is similar for the four protocols used
   with only a minor change for usa90 (usa19hs) required */
static int keyspan_write(struct tty_struct *tty,
        struct usb_serial_port *port, const unsigned char *buf, int count)
{
        struct keyspan_port_private     *p_priv;
        const struct keyspan_device_details     *d_details;
        int                             flip;
        int                             left, todo;
        struct urb                      *this_urb;
        int                             err, maxDataLen, dataOffset;

        p_priv = usb_get_serial_port_data(port);
        d_details = p_priv->device_details;

        if (d_details->msg_format == msg_usa90) {
                maxDataLen = 64;
                dataOffset = 0;
        } else {
                maxDataLen = 63;
                dataOffset = 1;
        }

        dev_dbg(&port->dev, "%s - for port %d (%d chars), flip=%d\n",
                __func__, port->number, count, p_priv->out_flip);

        for (left = count; left > 0; left -= todo) {
                todo = left;
                if (todo > maxDataLen)
                        todo = maxDataLen;

                flip = p_priv->out_flip;

                /* Check we have a valid urb/endpoint before we use it... */
                this_urb = p_priv->out_urbs[flip];
                if (this_urb == NULL) {
                        /* no bulk out, so return 0 bytes written */
                        dev_dbg(&port->dev, "%s - no output urb :(\n", __func__);
                        return count;
                }

                dev_dbg(&port->dev, "%s - endpoint %d flip %d\n",
                        __func__, usb_pipeendpoint(this_urb->pipe), flip);

                if (this_urb->status == -EINPROGRESS) {
                        if (time_before(jiffies,
                                        p_priv->tx_start_time[flip] + 10 * HZ))
                                break;
                        usb_unlink_urb(this_urb);
                        break;
                }

                /* First byte in buffer is "last flag" (except for usa19hx)
                   - unused so for now so set to zero */
                ((char *)this_urb->transfer_buffer)[0] = 0;

                memcpy(this_urb->transfer_buffer + dataOffset, buf, todo);
                buf += todo;

                /* send the data out the bulk port */
                this_urb->transfer_buffer_length = todo + dataOffset;

                err = usb_submit_urb(this_urb, GFP_ATOMIC);
                if (err != 0)
                        dev_dbg(&port->dev, "usb_submit_urb(write bulk) failed (%d)\n", err);
                p_priv->tx_start_time[flip] = jiffies;

                /* Flip for next time if usa26 or usa28 interface
                   (not used on usa49) */
                p_priv->out_flip = (flip + 1) & d_details->outdat_endp_flip;
        }

        return count - left;
}

static void     usa26_indat_callback(struct urb *urb)
{
        int                     i, err;
        int                     endpoint;
        struct usb_serial_port  *port;
        unsigned char           *data = urb->transfer_buffer;
        int status = urb->status;

        endpoint = usb_pipeendpoint(urb->pipe);

        if (status) {
                dev_dbg(&urb->dev->dev, "%s - nonzero status: %x on endpoint %d.\n",
                        __func__, status, endpoint);
                return;
        }

        port =  urb->context;
        if (urb->actual_length) {
                /* 0x80 bit is error flag */
                if ((data[0] & 0x80) == 0) {
                        /* no errors on individual bytes, only
                           possible overrun err */
                        if (data[0] & RXERROR_OVERRUN)
                                err = TTY_OVERRUN;
                        else
                                err = 0;
                        for (i = 1; i < urb->actual_length ; ++i)
                                tty_insert_flip_char(&port->port, data[i], err);
                } else {
                        /* some bytes had errors, every byte has status */
                        dev_dbg(&port->dev, "%s - RX error!!!!\n", __func__);
                        for (i = 0; i + 1 < urb->actual_length; i += 2) {
                                int stat = data[i], flag = 0;
                                if (stat & RXERROR_OVERRUN)
                                        flag |= TTY_OVERRUN;
                                if (stat & RXERROR_FRAMING)
                                        flag |= TTY_FRAME;
                                if (stat & RXERROR_PARITY)
                                        flag |= TTY_PARITY;
                                /* XXX should handle break (0x10) */
                                tty_insert_flip_char(&port->port, data[i+1],
                                                flag);
                        }
                }
                tty_flip_buffer_push(&port->port);
        }

        /* Resubmit urb so we continue receiving */
        err = usb_submit_urb(urb, GFP_ATOMIC);
        if (err != 0)
                dev_dbg(&port->dev, "%s - resubmit read urb failed. (%d)\n", __func__, err);
}

/* Outdat handling is common for all devices */
static void     usa2x_outdat_callback(struct urb *urb)
{
        struct usb_serial_port *port;
        struct keyspan_port_private *p_priv;

        port =  urb->context;
        p_priv = usb_get_serial_port_data(port);
        dev_dbg(&port->dev, "%s - urb %d\n", __func__, urb == p_priv->out_urbs[1]);

        usb_serial_port_softint(port);
}

static void     usa26_inack_callback(struct urb *urb)
{
}

static void     usa26_outcont_callback(struct urb *urb)
{
        struct usb_serial_port *port;
        struct keyspan_port_private *p_priv;

        port =  urb->context;
        p_priv = usb_get_serial_port_data(port);

        if (p_priv->resend_cont) {
                dev_dbg(&port->dev, "%s - sending setup\n", __func__);
                keyspan_usa26_send_setup(port->serial, port,
                                                p_priv->resend_cont - 1);
        }
}

static void     usa26_instat_callback(struct urb *urb)
{
        unsigned char                           *data = urb->transfer_buffer;
        struct keyspan_usa26_portStatusMessage  *msg;
        struct usb_serial                       *serial;
        struct usb_serial_port                  *port;
        struct keyspan_port_private             *p_priv;
        int old_dcd_state, err;
        int status = urb->status;

        serial =  urb->context;

        if (status) {
                dev_dbg(&urb->dev->dev, "%s - nonzero status: %x\n", __func__, status);
                return;
        }
        if (urb->actual_length != 9) {
                dev_dbg(&urb->dev->dev, "%s - %d byte report??\n", __func__, urb->actual_length);
                goto exit;
        }

        msg = (struct keyspan_usa26_portStatusMessage *)data;

#if 0
        dev_dbg(&urb->dev->dev,
                "%s - port status: port %d cts %d dcd %d dsr %d ri %d toff %d txoff %d rxen %d cr %d",
                __func__, msg->port, msg->hskia_cts, msg->gpia_dcd, msg->dsr,
                msg->ri, msg->_txOff, msg->_txXoff, msg->rxEnabled,
                msg->controlResponse);
#endif

        /* Now do something useful with the data */


        /* Check port number from message and retrieve private data */
        if (msg->port >= serial->num_ports) {
                dev_dbg(&urb->dev->dev, "%s - Unexpected port number %d\n", __func__, msg->port);
                goto exit;
        }
        port = serial->port[msg->port];
        p_priv = usb_get_serial_port_data(port);

        /* Update handshaking pin state information */
        old_dcd_state = p_priv->dcd_state;
        p_priv->cts_state = ((msg->hskia_cts) ? 1 : 0);
        p_priv->dsr_state = ((msg->dsr) ? 1 : 0);
        p_priv->dcd_state = ((msg->gpia_dcd) ? 1 : 0);
        p_priv->ri_state = ((msg->ri) ? 1 : 0);

        if (old_dcd_state != p_priv->dcd_state)
                tty_port_tty_hangup(&port->port, true);

        /* Resubmit urb so we continue receiving */
        err = usb_submit_urb(urb, GFP_ATOMIC);
        if (err != 0)
                dev_dbg(&port->dev, "%s - resubmit read urb failed. (%d)\n", __func__, err);
exit: ;
}

static void     usa26_glocont_callback(struct urb *urb)
{
}


static void usa28_indat_callback(struct urb *urb)
{
        int                     err;
        struct usb_serial_port  *port;
        unsigned char           *data;
        struct keyspan_port_private             *p_priv;
        int status = urb->status;

        port =  urb->context;
        p_priv = usb_get_serial_port_data(port);
        data = urb->transfer_buffer;

        if (urb != p_priv->in_urbs[p_priv->in_flip])
                return;

        do {
                if (status) {
                        dev_dbg(&urb->dev->dev, "%s - nonzero status: %x on endpoint %d.\n",
                                __func__, status, usb_pipeendpoint(urb->pipe));
                        return;
                }

                port =  urb->context;
                p_priv = usb_get_serial_port_data(port);
                data = urb->transfer_buffer;

                if (urb->actual_length) {
                        tty_insert_flip_string(&port->port, data,
                                        urb->actual_length);
                        tty_flip_buffer_push(&port->port);
                }

                /* Resubmit urb so we continue receiving */
                err = usb_submit_urb(urb, GFP_ATOMIC);
                if (err != 0)
                        dev_dbg(&port->dev, "%s - resubmit read urb failed. (%d)\n",
                                                        __func__, err);
                p_priv->in_flip ^= 1;

                urb = p_priv->in_urbs[p_priv->in_flip];
        } while (urb->status != -EINPROGRESS);
}

static void     usa28_inack_callback(struct urb *urb)
{
}

static void     usa28_outcont_callback(struct urb *urb)
{
        struct usb_serial_port *port;
        struct keyspan_port_private *p_priv;

        port =  urb->context;
        p_priv = usb_get_serial_port_data(port);

        if (p_priv->resend_cont) {
                dev_dbg(&port->dev, "%s - sending setup\n", __func__);
                keyspan_usa28_send_setup(port->serial, port,
                                                p_priv->resend_cont - 1);
        }
}

static void     usa28_instat_callback(struct urb *urb)
{
        int                                     err;
        unsigned char                           *data = urb->transfer_buffer;
        struct keyspan_usa28_portStatusMessage  *msg;
        struct usb_serial                       *serial;
        struct usb_serial_port                  *port;
        struct keyspan_port_private             *p_priv;
        int old_dcd_state;
        int status = urb->status;

        serial =  urb->context;

        if (status) {
                dev_dbg(&urb->dev->dev, "%s - nonzero status: %x\n", __func__, status);
                return;
        }

        if (urb->actual_length != sizeof(struct keyspan_usa28_portStatusMessage)) {
                dev_dbg(&urb->dev->dev, "%s - bad length %d\n", __func__, urb->actual_length);
                goto exit;
        }

        /*
        dev_dbg(&urb->dev->dev,
                "%s %x %x %x %x %x %x %x %x %x %x %x %x", __func__,
                data[0], data[1], data[2], data[3], data[4], data[5],
                data[6], data[7], data[8], data[9], data[10], data[11]);
        */

        /* Now do something useful with the data */
        msg = (struct keyspan_usa28_portStatusMessage *)data;

        /* Check port number from message and retrieve private data */
        if (msg->port >= serial->num_ports) {
                dev_dbg(&urb->dev->dev, "%s - Unexpected port number %d\n", __func__, msg->port);
                goto exit;
        }
        port = serial->port[msg->port];
        p_priv = usb_get_serial_port_data(port);

        /* Update handshaking pin state information */
        old_dcd_state = p_priv->dcd_state;
        p_priv->cts_state = ((msg->cts) ? 1 : 0);
        p_priv->dsr_state = ((msg->dsr) ? 1 : 0);
        p_priv->dcd_state = ((msg->dcd) ? 1 : 0);
        p_priv->ri_state = ((msg->ri) ? 1 : 0);

        if (old_dcd_state != p_priv->dcd_state && old_dcd_state)
                tty_port_tty_hangup(&port->port, true);

                /* Resubmit urb so we continue receiving */
        err = usb_submit_urb(urb, GFP_ATOMIC);
        if (err != 0)
                dev_dbg(&port->dev, "%s - resubmit read urb failed. (%d)\n", __func__, err);
exit: ;
}

static void     usa28_glocont_callback(struct urb *urb)
{
}


static void     usa49_glocont_callback(struct urb *urb)
{
        struct usb_serial *serial;
        struct usb_serial_port *port;
        struct keyspan_port_private *p_priv;
        int i;

        serial =  urb->context;
        for (i = 0; i < serial->num_ports; ++i) {
                port = serial->port[i];
                p_priv = usb_get_serial_port_data(port);

                if (p_priv->resend_cont) {
                        dev_dbg(&port->dev, "%s - sending setup\n", __func__);
                        keyspan_usa49_send_setup(serial, port,
                                                p_priv->resend_cont - 1);
                        break;
                }
        }
}

        /* This is actually called glostat in the Keyspan
           doco */
static void     usa49_instat_callback(struct urb *urb)
{
        int                                     err;
        unsigned char                           *data = urb->transfer_buffer;
        struct keyspan_usa49_portStatusMessage  *msg;
        struct usb_serial                       *serial;
        struct usb_serial_port                  *port;
        struct keyspan_port_private             *p_priv;
        int old_dcd_state;
        int status = urb->status;

        serial =  urb->context;

        if (status) {
                dev_dbg(&urb->dev->dev, "%s - nonzero status: %x\n", __func__, status);
                return;
        }

        if (urb->actual_length !=
                        sizeof(struct keyspan_usa49_portStatusMessage)) {
                dev_dbg(&urb->dev->dev, "%s - bad length %d\n", __func__, urb->actual_length);
                goto exit;
        }

        /*
        dev_dbg(&urb->dev->dev, "%s: %x %x %x %x %x %x %x %x %x %x %x",
                __func__, data[0], data[1], data[2], data[3], data[4],
                data[5], data[6], data[7], data[8], data[9], data[10]);
        */

        /* Now do something useful with the data */
        msg = (struct keyspan_usa49_portStatusMessage *)data;

        /* Check port number from message and retrieve private data */
        if (msg->portNumber >= serial->num_ports) {
                dev_dbg(&urb->dev->dev, "%s - Unexpected port number %d\n",
                        __func__, msg->portNumber);
                goto exit;
        }
        port = serial->port[msg->portNumber];
        p_priv = usb_get_serial_port_data(port);

        /* Update handshaking pin state information */
        old_dcd_state = p_priv->dcd_state;
        p_priv->cts_state = ((msg->cts) ? 1 : 0);
        p_priv->dsr_state = ((msg->dsr) ? 1 : 0);
        p_priv->dcd_state = ((msg->dcd) ? 1 : 0);
        p_priv->ri_state = ((msg->ri) ? 1 : 0);

        if (old_dcd_state != p_priv->dcd_state && old_dcd_state)
                tty_port_tty_hangup(&port->port, true);

        /* Resubmit urb so we continue receiving */
        err = usb_submit_urb(urb, GFP_ATOMIC);
        if (err != 0)
                dev_dbg(&port->dev, "%s - resubmit read urb failed. (%d)\n", __func__, err);
exit:   ;
}

static void     usa49_inack_callback(struct urb *urb)
{
}

static void     usa49_indat_callback(struct urb *urb)
{
        int                     i, err;
        int                     endpoint;
        struct usb_serial_port  *port;
        unsigned char           *data = urb->transfer_buffer;
        int status = urb->status;

        endpoint = usb_pipeendpoint(urb->pipe);

        if (status) {
                dev_dbg(&urb->dev->dev, "%s - nonzero status: %x on endpoint %d.\n",
                        __func__, status, endpoint);
                return;
        }

        port =  urb->context;
        if (urb->actual_length) {
                /* 0x80 bit is error flag */
                if ((data[0] & 0x80) == 0) {
                        /* no error on any byte */
                        tty_insert_flip_string(&port->port, data + 1,
                                                urb->actual_length - 1);
                } else {
                        /* some bytes had errors, every byte has status */
                        for (i = 0; i + 1 < urb->actual_length; i += 2) {
                                int stat = data[i], flag = 0;
                                if (stat & RXERROR_OVERRUN)
                                        flag |= TTY_OVERRUN;
                                if (stat & RXERROR_FRAMING)
                                        flag |= TTY_FRAME;
                                if (stat & RXERROR_PARITY)
                                        flag |= TTY_PARITY;
                                /* XXX should handle break (0x10) */
                                tty_insert_flip_char(&port->port, data[i+1],
                                                flag);
                        }
                }
                tty_flip_buffer_push(&port->port);
        }

        /* Resubmit urb so we continue receiving */
        err = usb_submit_urb(urb, GFP_ATOMIC);
        if (err != 0)
                dev_dbg(&port->dev, "%s - resubmit read urb failed. (%d)\n", __func__, err);
}

static void usa49wg_indat_callback(struct urb *urb)
{
        int                     i, len, x, err;
        struct usb_serial       *serial;
        struct usb_serial_port  *port;
        unsigned char           *data = urb->transfer_buffer;
        int status = urb->status;

        serial = urb->context;

        if (status) {
                dev_dbg(&urb->dev->dev, "%s - nonzero status: %x\n", __func__, status);
                return;
        }

        /* inbound data is in the form P#, len, status, data */
        i = 0;
        len = 0;

        while (i < urb->actual_length) {

                /* Check port number from message */
                if (data[i] >= serial->num_ports) {
                        dev_dbg(&urb->dev->dev, "%s - Unexpected port number %d\n",
                                __func__, data[i]);
                        return;
                }
                port = serial->port[data[i++]];
                len = data[i++];

                /* 0x80 bit is error flag */
                if ((data[i] & 0x80) == 0) {
                        /* no error on any byte */
                        i++;
                        for (x = 1; x < len && i < urb->actual_length; ++x)
                                tty_insert_flip_char(&port->port,
                                                data[i++], 0);
                } else {
                        /*
                         * some bytes had errors, every byte has status
                         */
                        for (x = 0; x + 1 < len &&
                                    i + 1 < urb->actual_length; x += 2) {
                                int stat = data[i], flag = 0;

                                if (stat & RXERROR_OVERRUN)
                                        flag |= TTY_OVERRUN;
                                if (stat & RXERROR_FRAMING)
                                        flag |= TTY_FRAME;
                                if (stat & RXERROR_PARITY)
                                        flag |= TTY_PARITY;
                                /* XXX should handle break (0x10) */
                                tty_insert_flip_char(&port->port, data[i+1],
                                                     flag);
                                i += 2;
                        }
                }
                tty_flip_buffer_push(&port->port);
        }

        /* Resubmit urb so we continue receiving */
        err = usb_submit_urb(urb, GFP_ATOMIC);
        if (err != 0)
                dev_dbg(&urb->dev->dev, "%s - resubmit read urb failed. (%d)\n", __func__, err);
}

/* not used, usa-49 doesn't have per-port control endpoints */
static void usa49_outcont_callback(struct urb *urb)
{
}

static void usa90_indat_callback(struct urb *urb)
{
        int                     i, err;
        int                     endpoint;
        struct usb_serial_port  *port;
        struct keyspan_port_private             *p_priv;
        unsigned char           *data = urb->transfer_buffer;
        int status = urb->status;

        endpoint = usb_pipeendpoint(urb->pipe);

        if (status) {
                dev_dbg(&urb->dev->dev, "%s - nonzero status: %x on endpoint %d.\n",
                    __func__, status, endpoint);
                return;
        }

        port =  urb->context;
        p_priv = usb_get_serial_port_data(port);

        if (urb->actual_length) {
                /* if current mode is DMA, looks like usa28 format
                   otherwise looks like usa26 data format */

                if (p_priv->baud > 57600)
                        tty_insert_flip_string(&port->port, data,
                                        urb->actual_length);
                else {
                        /* 0x80 bit is error flag */
                        if ((data[0] & 0x80) == 0) {
                                /* no errors on individual bytes, only
                                   possible overrun err*/
                                if (data[0] & RXERROR_OVERRUN)
                                        err = TTY_OVERRUN;
                                else
                                        err = 0;
                                for (i = 1; i < urb->actual_length ; ++i)
                                        tty_insert_flip_char(&port->port,
                                                        data[i], err);
                        }  else {
                        /* some bytes had errors, every byte has status */
                                dev_dbg(&port->dev, "%s - RX error!!!!\n", __func__);
                                for (i = 0; i + 1 < urb->actual_length; i += 2) {
                                        int stat = data[i], flag = 0;
                                        if (stat & RXERROR_OVERRUN)
                                                flag |= TTY_OVERRUN;
                                        if (stat & RXERROR_FRAMING)
                                                flag |= TTY_FRAME;
                                        if (stat & RXERROR_PARITY)
                                                flag |= TTY_PARITY;
                                        /* XXX should handle break (0x10) */
                                        tty_insert_flip_char(&port->port,
                                                        data[i+1], flag);
                                }
                        }
                }
                tty_flip_buffer_push(&port->port);
        }

        /* Resubmit urb so we continue receiving */
        err = usb_submit_urb(urb, GFP_ATOMIC);
        if (err != 0)
                dev_dbg(&port->dev, "%s - resubmit read urb failed. (%d)\n", __func__, err);
}


static void     usa90_instat_callback(struct urb *urb)
{
        unsigned char                           *data = urb->transfer_buffer;
        struct keyspan_usa90_portStatusMessage  *msg;
        struct usb_serial                       *serial;
        struct usb_serial_port                  *port;
        struct keyspan_port_private             *p_priv;
        int old_dcd_state, err;
        int status = urb->status;

        serial =  urb->context;

        if (status) {
                dev_dbg(&urb->dev->dev, "%s - nonzero status: %x\n", __func__, status);
                return;
        }
        if (urb->actual_length < 14) {
                dev_dbg(&urb->dev->dev, "%s - %d byte report??\n", __func__, urb->actual_length);
                goto exit;
        }

        msg = (struct keyspan_usa90_portStatusMessage *)data;

        /* Now do something useful with the data */

        port = serial->port[0];
        p_priv = usb_get_serial_port_data(port);

        /* Update handshaking pin state information */
        old_dcd_state = p_priv->dcd_state;
        p_priv->cts_state = ((msg->cts) ? 1 : 0);
        p_priv->dsr_state = ((msg->dsr) ? 1 : 0);
        p_priv->dcd_state = ((msg->dcd) ? 1 : 0);
        p_priv->ri_state = ((msg->ri) ? 1 : 0);

        if (old_dcd_state != p_priv->dcd_state && old_dcd_state)
                tty_port_tty_hangup(&port->port, true);

        /* Resubmit urb so we continue receiving */
        err = usb_submit_urb(urb, GFP_ATOMIC);
        if (err != 0)
                dev_dbg(&port->dev, "%s - resubmit read urb failed. (%d)\n", __func__, err);
exit:
        ;
}

static void     usa90_outcont_callback(struct urb *urb)
{
        struct usb_serial_port *port;
        struct keyspan_port_private *p_priv;

        port =  urb->context;
        p_priv = usb_get_serial_port_data(port);

        if (p_priv->resend_cont) {
                dev_dbg(&urb->dev->dev, "%s - sending setup\n", __func__);
                keyspan_usa90_send_setup(port->serial, port,
                                                p_priv->resend_cont - 1);
        }
}

/* Status messages from the 28xg */
static void     usa67_instat_callback(struct urb *urb)
{
        int                                     err;
        unsigned char                           *data = urb->transfer_buffer;
        struct keyspan_usa67_portStatusMessage  *msg;
        struct usb_serial                       *serial;
        struct usb_serial_port                  *port;
        struct keyspan_port_private             *p_priv;
        int old_dcd_state;
        int status = urb->status;

        serial = urb->context;

        if (status) {
                dev_dbg(&urb->dev->dev, "%s - nonzero status: %x\n", __func__, status);
                return;
        }

        if (urb->actual_length !=
                        sizeof(struct keyspan_usa67_portStatusMessage)) {
                dev_dbg(&urb->dev->dev, "%s - bad length %d\n", __func__, urb->actual_length);
                return;
        }


        /* Now do something useful with the data */
        msg = (struct keyspan_usa67_portStatusMessage *)data;

        /* Check port number from message and retrieve private data */
        if (msg->port >= serial->num_ports) {
                dev_dbg(&urb->dev->dev, "%s - Unexpected port number %d\n", __func__, msg->port);
                return;
        }

        port = serial->port[msg->port];
        p_priv = usb_get_serial_port_data(port);

        /* Update handshaking pin state information */
        old_dcd_state = p_priv->dcd_state;
        p_priv->cts_state = ((msg->hskia_cts) ? 1 : 0);
        p_priv->dcd_state = ((msg->gpia_dcd) ? 1 : 0);

        if (old_dcd_state != p_priv->dcd_state && old_dcd_state)
                tty_port_tty_hangup(&port->port, true);

        /* Resubmit urb so we continue receiving */
        err = usb_submit_urb(urb, GFP_ATOMIC);
        if (err != 0)
                dev_dbg(&port->dev, "%s - resubmit read urb failed. (%d)\n", __func__, err);
}

static void usa67_glocont_callback(struct urb *urb)
{
        struct usb_serial *serial;
        struct usb_serial_port *port;
        struct keyspan_port_private *p_priv;
        int i;

        serial = urb->context;
        for (i = 0; i < serial->num_ports; ++i) {
                port = serial->port[i];
                p_priv = usb_get_serial_port_data(port);

                if (p_priv->resend_cont) {
                        dev_dbg(&port->dev, "%s - sending setup\n", __func__);
                        keyspan_usa67_send_setup(serial, port,
                                                p_priv->resend_cont - 1);
                        break;
                }
        }
}

static int keyspan_write_room(struct tty_struct *tty)
{
        struct usb_serial_port *port = tty->driver_data;
        struct keyspan_port_private     *p_priv;
        const struct keyspan_device_details     *d_details;
        int                             flip;
        int                             data_len;
        struct urb                      *this_urb;

        p_priv = usb_get_serial_port_data(port);
        d_details = p_priv->device_details;

        /* FIXME: locking */
        if (d_details->msg_format == msg_usa90)
                data_len = 64;
        else
                data_len = 63;

        flip = p_priv->out_flip;

        /* Check both endpoints to see if any are available. */
        this_urb = p_priv->out_urbs[flip];
        if (this_urb != NULL) {
                if (this_urb->status != -EINPROGRESS)
                        return data_len;
                flip = (flip + 1) & d_details->outdat_endp_flip;
                this_urb = p_priv->out_urbs[flip];
                if (this_urb != NULL) {
                        if (this_urb->status != -EINPROGRESS)
                                return data_len;
                }
        }
        return 0;
}

static int keyspan_open(struct tty_struct *tty, struct usb_serial_port *port)
{
        struct keyspan_port_private     *p_priv;
        const struct keyspan_device_details     *d_details;
        int                             i, err;
        int                             baud_rate, device_port;
        struct urb                      *urb;
        unsigned int                    cflag = 0;

        p_priv = usb_get_serial_port_data(port);
        d_details = p_priv->device_details;

        /* Set some sane defaults */
        p_priv->rts_state = 1;
        p_priv->dtr_state = 1;
        p_priv->baud = 9600;

        /* force baud and lcr to be set on open */
        p_priv->old_baud = 0;
        p_priv->old_cflag = 0;

        p_priv->out_flip = 0;
        p_priv->in_flip = 0;

        /* Reset low level data toggle and start reading from endpoints */
        for (i = 0; i < 2; i++) {
                urb = p_priv->in_urbs[i];
                if (urb == NULL)
                        continue;

                /* make sure endpoint data toggle is synchronized
                   with the device */
                usb_clear_halt(urb->dev, urb->pipe);
                err = usb_submit_urb(urb, GFP_KERNEL);
                if (err != 0)
                        dev_dbg(&port->dev, "%s - submit urb %d failed (%d)\n", __func__, i, err);
        }

        /* Reset low level data toggle on out endpoints */
        for (i = 0; i < 2; i++) {
                urb = p_priv->out_urbs[i];
                if (urb == NULL)
                        continue;
                /* usb_settoggle(urb->dev, usb_pipeendpoint(urb->pipe),
                                                usb_pipeout(urb->pipe), 0); */
        }

        /* get the terminal config for the setup message now so we don't
         * need to send 2 of them */

        device_port = port->number - port->serial->minor;
        if (tty) {
                cflag = tty->termios.c_cflag;
                /* Baud rate calculation takes baud rate as an integer
                   so other rates can be generated if desired. */
                baud_rate = tty_get_baud_rate(tty);
                /* If no match or invalid, leave as default */
                if (baud_rate >= 0
                    && d_details->calculate_baud_rate(port, baud_rate, d_details->baudclk,
                                        NULL, NULL, NULL, device_port) == KEYSPAN_BAUD_RATE_OK) {
                        p_priv->baud = baud_rate;
                }
        }
        /* set CTS/RTS handshake etc. */
        p_priv->cflag = cflag;
        p_priv->flow_control = (cflag & CRTSCTS) ? flow_cts : flow_none;

        keyspan_send_setup(port, 1);
        /* mdelay(100); */
        /* keyspan_set_termios(port, NULL); */

        return 0;
}

static inline void stop_urb(struct urb *urb)
{
        if (urb && urb->status == -EINPROGRESS)
                usb_kill_urb(urb);
}

static void keyspan_dtr_rts(struct usb_serial_port *port, int on)
{
        struct keyspan_port_private *p_priv = usb_get_serial_port_data(port);

        p_priv->rts_state = on;
        p_priv->dtr_state = on;
        keyspan_send_setup(port, 0);
}

static void keyspan_close(struct usb_serial_port *port)
{
        int                     i;
        struct keyspan_port_private     *p_priv;

        p_priv = usb_get_serial_port_data(port);

        p_priv->rts_state = 0;
        p_priv->dtr_state = 0;

        keyspan_send_setup(port, 2);
        /* pilot-xfer seems to work best with this delay */
        mdelay(100);

        p_priv->out_flip = 0;
        p_priv->in_flip = 0;

        stop_urb(p_priv->inack_urb);
        for (i = 0; i < 2; i++) {
                stop_urb(p_priv->in_urbs[i]);
                stop_urb(p_priv->out_urbs[i]);
        }
}

/* download the firmware to a pre-renumeration device */
static int keyspan_fake_startup(struct usb_serial *serial)
{
        char    *fw_name;

        dev_dbg(&serial->dev->dev, "Keyspan startup version %04x product %04x\n",
                le16_to_cpu(serial->dev->descriptor.bcdDevice),
                le16_to_cpu(serial->dev->descriptor.idProduct));

        if ((le16_to_cpu(serial->dev->descriptor.bcdDevice) & 0x8000)
                                                                != 0x8000) {
                dev_dbg(&serial->dev->dev, "Firmware already loaded.  Quitting.\n");
                return 1;
        }

                /* Select firmware image on the basis of idProduct */
        switch (le16_to_cpu(serial->dev->descriptor.idProduct)) {
        case keyspan_usa28_pre_product_id:
                fw_name = "keyspan/usa28.fw";
                break;

        case keyspan_usa28x_pre_product_id:
                fw_name = "keyspan/usa28x.fw";
                break;

        case keyspan_usa28xa_pre_product_id:
                fw_name = "keyspan/usa28xa.fw";
                break;

        case keyspan_usa28xb_pre_product_id:
                fw_name = "keyspan/usa28xb.fw";
                break;

        case keyspan_usa19_pre_product_id:
                fw_name = "keyspan/usa19.fw";
                break;

        case keyspan_usa19qi_pre_product_id:
                fw_name = "keyspan/usa19qi.fw";
                break;

        case keyspan_mpr_pre_product_id:
                fw_name = "keyspan/mpr.fw";
                break;

        case keyspan_usa19qw_pre_product_id:
                fw_name = "keyspan/usa19qw.fw";
                break;

        case keyspan_usa18x_pre_product_id:
                fw_name = "keyspan/usa18x.fw";
                break;

        case keyspan_usa19w_pre_product_id:
                fw_name = "keyspan/usa19w.fw";
                break;

        case keyspan_usa49w_pre_product_id:
                fw_name = "keyspan/usa49w.fw";
                break;

        case keyspan_usa49wlc_pre_product_id:
                fw_name = "keyspan/usa49wlc.fw";
                break;

        default:
                dev_err(&serial->dev->dev, "Unknown product ID (%04x)\n",
                        le16_to_cpu(serial->dev->descriptor.idProduct));
                return 1;
        }

        dev_dbg(&serial->dev->dev, "Uploading Keyspan %s firmware.\n", fw_name);

        if (ezusb_fx1_ihex_firmware_download(serial->dev, fw_name) < 0) {
                dev_err(&serial->dev->dev, "failed to load firmware \"%s\"\n",
                        fw_name);
                return -ENOENT;
        }

        /* after downloading firmware Renumeration will occur in a
          moment and the new device will bind to the real driver */

        /* we don't want this device to have a driver assigned to it. */
        return 1;
}

/* Helper functions used by keyspan_setup_urbs */
static struct usb_endpoint_descriptor const *find_ep(struct usb_serial const *serial,
                                                     int endpoint)
{
        struct usb_host_interface *iface_desc;
        struct usb_endpoint_descriptor *ep;
        int i;

        iface_desc = serial->interface->cur_altsetting;
        for (i = 0; i < iface_desc->desc.bNumEndpoints; ++i) {
                ep = &iface_desc->endpoint[i].desc;
                if (ep->bEndpointAddress == endpoint)
                        return ep;
        }
        dev_warn(&serial->interface->dev, "found no endpoint descriptor for "
                 "endpoint %x\n", endpoint);
        return NULL;
}

static struct urb *keyspan_setup_urb(struct usb_serial *serial, int endpoint,
                                      int dir, void *ctx, char *buf, int len,
                                      void (*callback)(struct urb *))
{
        struct urb *urb;
        struct usb_endpoint_descriptor const *ep_desc;
        char const *ep_type_name;

        if (endpoint == -1)
                return NULL;            /* endpoint not needed */

        dev_dbg(&serial->interface->dev, "%s - alloc for endpoint %d.\n", __func__, endpoint);
        urb = usb_alloc_urb(0, GFP_KERNEL);             /* No ISO */
        if (urb == NULL) {
                dev_dbg(&serial->interface->dev, "%s - alloc for endpoint %d failed.\n", __func__, endpoint);
                return NULL;
        }

        if (endpoint == 0) {
                /* control EP filled in when used */
                return urb;
        }

        ep_desc = find_ep(serial, endpoint);
        if (!ep_desc) {
                /* leak the urb, something's wrong and the callers don't care */
                return urb;
        }
        if (usb_endpoint_xfer_int(ep_desc)) {
                ep_type_name = "INT";
                usb_fill_int_urb(urb, serial->dev,
                                 usb_sndintpipe(serial->dev, endpoint) | dir,
                                 buf, len, callback, ctx,
                                 ep_desc->bInterval);
        } else if (usb_endpoint_xfer_bulk(ep_desc)) {
                ep_type_name = "BULK";
                usb_fill_bulk_urb(urb, serial->dev,
                                  usb_sndbulkpipe(serial->dev, endpoint) | dir,
                                  buf, len, callback, ctx);
        } else {
                dev_warn(&serial->interface->dev,
                         "unsupported endpoint type %x\n",
                         usb_endpoint_type(ep_desc));
                usb_free_urb(urb);
                return NULL;
        }

        dev_dbg(&serial->interface->dev, "%s - using urb %p for %s endpoint %x\n",
            __func__, urb, ep_type_name, endpoint);
        return urb;
}

static struct callbacks {
        void    (*instat_callback)(struct urb *);
        void    (*glocont_callback)(struct urb *);
        void    (*indat_callback)(struct urb *);
        void    (*outdat_callback)(struct urb *);
        void    (*inack_callback)(struct urb *);
        void    (*outcont_callback)(struct urb *);
} keyspan_callbacks[] = {
        {
                /* msg_usa26 callbacks */
                .instat_callback =      usa26_instat_callback,
                .glocont_callback =     usa26_glocont_callback,
                .indat_callback =       usa26_indat_callback,
                .outdat_callback =      usa2x_outdat_callback,
                .inack_callback =       usa26_inack_callback,
                .outcont_callback =     usa26_outcont_callback,
        }, {
                /* msg_usa28 callbacks */
                .instat_callback =      usa28_instat_callback,
                .glocont_callback =     usa28_glocont_callback,
                .indat_callback =       usa28_indat_callback,
                .outdat_callback =      usa2x_outdat_callback,
                .inack_callback =       usa28_inack_callback,
                .outcont_callback =     usa28_outcont_callback,
        }, {
                /* msg_usa49 callbacks */
                .instat_callback =      usa49_instat_callback,
                .glocont_callback =     usa49_glocont_callback,
                .indat_callback =       usa49_indat_callback,
                .outdat_callback =      usa2x_outdat_callback,
                .inack_callback =       usa49_inack_callback,
                .outcont_callback =     usa49_outcont_callback,
        }, {
                /* msg_usa90 callbacks */
                .instat_callback =      usa90_instat_callback,
                .glocont_callback =     usa28_glocont_callback,
                .indat_callback =       usa90_indat_callback,
                .outdat_callback =      usa2x_outdat_callback,
                .inack_callback =       usa28_inack_callback,
                .outcont_callback =     usa90_outcont_callback,
        }, {
                /* msg_usa67 callbacks */
                .instat_callback =      usa67_instat_callback,
                .glocont_callback =     usa67_glocont_callback,
                .indat_callback =       usa26_indat_callback,
                .outdat_callback =      usa2x_outdat_callback,
                .inack_callback =       usa26_inack_callback,
                .outcont_callback =     usa26_outcont_callback,
        }
};

        /* Generic setup urbs function that uses
           data in device_details */
static void keyspan_setup_urbs(struct usb_serial *serial)
{
        struct keyspan_serial_private   *s_priv;
        const struct keyspan_device_details     *d_details;
        struct callbacks                *cback;

        s_priv = usb_get_serial_data(serial);
        d_details = s_priv->device_details;

        /* Setup values for the various callback routines */
        cback = &keyspan_callbacks[d_details->msg_format];

        /* Allocate and set up urbs for each one that is in use,
           starting with instat endpoints */
        s_priv->instat_urb = keyspan_setup_urb
                (serial, d_details->instat_endpoint, USB_DIR_IN,
                 serial, s_priv->instat_buf, INSTAT_BUFLEN,
                 cback->instat_callback);

        s_priv->indat_urb = keyspan_setup_urb
                (serial, d_details->indat_endpoint, USB_DIR_IN,
                 serial, s_priv->indat_buf, INDAT49W_BUFLEN,
                 usa49wg_indat_callback);

        s_priv->glocont_urb = keyspan_setup_urb
                (serial, d_details->glocont_endpoint, USB_DIR_OUT,
                 serial, s_priv->glocont_buf, GLOCONT_BUFLEN,
                 cback->glocont_callback);
}

/* usa19 function doesn't require prescaler */
static int keyspan_usa19_calc_baud(struct usb_serial_port *port,
                                   u32 baud_rate, u32 baudclk, u8 *rate_hi,
                                   u8 *rate_low, u8 *prescaler, int portnum)
{
        u32     b16,    /* baud rate times 16 (actual rate used internally) */
                div,    /* divisor */
                cnt;    /* inverse of divisor (programmed into 8051) */

        dev_dbg(&port->dev, "%s - %d.\n", __func__, baud_rate);

        /* prevent divide by zero...  */
        b16 = baud_rate * 16L;
        if (b16 == 0)
                return KEYSPAN_INVALID_BAUD_RATE;
        /* Any "standard" rate over 57k6 is marginal on the USA-19
           as we run out of divisor resolution. */
        if (baud_rate > 57600)
                return KEYSPAN_INVALID_BAUD_RATE;

        /* calculate the divisor and the counter (its inverse) */
        div = baudclk / b16;
        if (div == 0)
                return KEYSPAN_INVALID_BAUD_RATE;
        else
                cnt = 0 - div;

        if (div > 0xffff)
                return KEYSPAN_INVALID_BAUD_RATE;

        /* return the counter values if non-null */
        if (rate_low)
                *rate_low = (u8) (cnt & 0xff);
        if (rate_hi)
                *rate_hi = (u8) ((cnt >> 8) & 0xff);
        if (rate_low && rate_hi)
                dev_dbg(&port->dev, "%s - %d %02x %02x.\n",
                                __func__, baud_rate, *rate_hi, *rate_low);
        return KEYSPAN_BAUD_RATE_OK;
}

/* usa19hs function doesn't require prescaler */
static int keyspan_usa19hs_calc_baud(struct usb_serial_port *port,
                                     u32 baud_rate, u32 baudclk, u8 *rate_hi,
                                     u8 *rate_low, u8 *prescaler, int portnum)
{
        u32     b16,    /* baud rate times 16 (actual rate used internally) */
                        div;    /* divisor */

        dev_dbg(&port->dev, "%s - %d.\n", __func__, baud_rate);

        /* prevent divide by zero...  */
        b16 = baud_rate * 16L;
        if (b16 == 0)
                return KEYSPAN_INVALID_BAUD_RATE;

        /* calculate the divisor */
        div = baudclk / b16;
        if (div == 0)
                return KEYSPAN_INVALID_BAUD_RATE;

        if (div > 0xffff)
                return KEYSPAN_INVALID_BAUD_RATE;

        /* return the counter values if non-null */
        if (rate_low)
                *rate_low = (u8) (div & 0xff);

        if (rate_hi)
                *rate_hi = (u8) ((div >> 8) & 0xff);

        if (rate_low && rate_hi)
                dev_dbg(&port->dev, "%s - %d %02x %02x.\n",
                        __func__, baud_rate, *rate_hi, *rate_low);

        return KEYSPAN_BAUD_RATE_OK;
}

static int keyspan_usa19w_calc_baud(struct usb_serial_port *port,
                                    u32 baud_rate, u32 baudclk, u8 *rate_hi,
                                    u8 *rate_low, u8 *prescaler, int portnum)
{
        u32     b16,    /* baud rate times 16 (actual rate used internally) */
                clk,    /* clock with 13/8 prescaler */
                div,    /* divisor using 13/8 prescaler */
                res,    /* resulting baud rate using 13/8 prescaler */
                diff,   /* error using 13/8 prescaler */
                smallest_diff;
        u8      best_prescaler;
        int     i;

        dev_dbg(&port->dev, "%s - %d.\n", __func__, baud_rate);

        /* prevent divide by zero */
        b16 = baud_rate * 16L;
        if (b16 == 0)
                return KEYSPAN_INVALID_BAUD_RATE;

        /* Calculate prescaler by trying them all and looking
           for best fit */

        /* start with largest possible difference */
        smallest_diff = 0xffffffff;

                /* 0 is an invalid prescaler, used as a flag */
        best_prescaler = 0;

        for (i = 8; i <= 0xff; ++i) {
                clk = (baudclk * 8) / (u32) i;

                div = clk / b16;
                if (div == 0)
                        continue;

                res = clk / div;
                diff = (res > b16) ? (res-b16) : (b16-res);

                if (diff < smallest_diff) {
                        best_prescaler = i;
                        smallest_diff = diff;
                }
        }

        if (best_prescaler == 0)
                return KEYSPAN_INVALID_BAUD_RATE;

        clk = (baudclk * 8) / (u32) best_prescaler;
        div = clk / b16;

        /* return the divisor and prescaler if non-null */
        if (rate_low)
                *rate_low = (u8) (div & 0xff);
        if (rate_hi)
                *rate_hi = (u8) ((div >> 8) & 0xff);
        if (prescaler) {
                *prescaler = best_prescaler;
                /*  dev_dbg(&port->dev, "%s - %d %d\n", __func__, *prescaler, div); */
        }
        return KEYSPAN_BAUD_RATE_OK;
}

        /* USA-28 supports different maximum baud rates on each port */
static int keyspan_usa28_calc_baud(struct usb_serial_port *port,
                                   u32 baud_rate, u32 baudclk, u8 *rate_hi,
                                   u8 *rate_low, u8 *prescaler, int portnum)
{
        u32     b16,    /* baud rate times 16 (actual rate used internally) */
                div,    /* divisor */
                cnt;    /* inverse of divisor (programmed into 8051) */

        dev_dbg(&port->dev, "%s - %d.\n", __func__, baud_rate);

                /* prevent divide by zero */
        b16 = baud_rate * 16L;
        if (b16 == 0)
                return KEYSPAN_INVALID_BAUD_RATE;

        /* calculate the divisor and the counter (its inverse) */
        div = KEYSPAN_USA28_BAUDCLK / b16;
        if (div == 0)
                return KEYSPAN_INVALID_BAUD_RATE;
        else
                cnt = 0 - div;

        /* check for out of range, based on portnum,
           and return result */
        if (portnum == 0) {
                if (div > 0xffff)
                        return KEYSPAN_INVALID_BAUD_RATE;
        } else {
                if (portnum == 1) {
                        if (div > 0xff)
                                return KEYSPAN_INVALID_BAUD_RATE;
                } else
                        return KEYSPAN_INVALID_BAUD_RATE;
        }

                /* return the counter values if not NULL
                   (port 1 will ignore retHi) */
        if (rate_low)
                *rate_low = (u8) (cnt & 0xff);
        if (rate_hi)
                *rate_hi = (u8) ((cnt >> 8) & 0xff);
        dev_dbg(&port->dev, "%s - %d OK.\n", __func__, baud_rate);
        return KEYSPAN_BAUD_RATE_OK;
}

static int keyspan_usa26_send_setup(struct usb_serial *serial,
                                    struct usb_serial_port *port,
                                    int reset_port)
{
        struct keyspan_usa26_portControlMessage msg;
        struct keyspan_serial_private           *s_priv;
        struct keyspan_port_private             *p_priv;
        const struct keyspan_device_details     *d_details;
        struct urb                              *this_urb;
        int                                     device_port, err;

        dev_dbg(&port->dev, "%s reset=%d\n", __func__, reset_port);

        s_priv = usb_get_serial_data(serial);
        p_priv = usb_get_serial_port_data(port);
        d_details = s_priv->device_details;
        device_port = port->number - port->serial->minor;

        this_urb = p_priv->outcont_urb;

        dev_dbg(&port->dev, "%s - endpoint %d\n", __func__, usb_pipeendpoint(this_urb->pipe));

                /* Make sure we have an urb then send the message */
        if (this_urb == NULL) {
                dev_dbg(&port->dev, "%s - oops no urb.\n", __func__);
                return -1;
        }

        /* Save reset port val for resend.
           Don't overwrite resend for open/close condition. */
        if ((reset_port + 1) > p_priv->resend_cont)
                p_priv->resend_cont = reset_port + 1;
        if (this_urb->status == -EINPROGRESS) {
                /*  dev_dbg(&port->dev, "%s - already writing\n", __func__); */
                mdelay(5);
                return -1;
        }

        memset(&msg, 0, sizeof(struct keyspan_usa26_portControlMessage));

        /* Only set baud rate if it's changed */
        if (p_priv->old_baud != p_priv->baud) {
                p_priv->old_baud = p_priv->baud;
                msg.setClocking = 0xff;
                if (d_details->calculate_baud_rate(port, p_priv->baud, d_details->baudclk,
                                                   &msg.baudHi, &msg.baudLo, &msg.prescaler,
                                                   device_port) == KEYSPAN_INVALID_BAUD_RATE) {
                        dev_dbg(&port->dev, "%s - Invalid baud rate %d requested, using 9600.\n",
                                __func__, p_priv->baud);
                        msg.baudLo = 0;
                        msg.baudHi = 125;       /* Values for 9600 baud */
                        msg.prescaler = 10;
                }
                msg.setPrescaler = 0xff;
        }

        msg.lcr = (p_priv->cflag & CSTOPB) ? STOPBITS_678_2 : STOPBITS_5678_1;
        switch (p_priv->cflag & CSIZE) {
        case CS5:
                msg.lcr |= USA_DATABITS_5;
                break;
        case CS6:
                msg.lcr |= USA_DATABITS_6;
                break;
        case CS7:
                msg.lcr |= USA_DATABITS_7;
                break;
        case CS8:
                msg.lcr |= USA_DATABITS_8;
                break;
        }
        if (p_priv->cflag & PARENB) {
                /* note USA_PARITY_NONE == 0 */
                msg.lcr |= (p_priv->cflag & PARODD) ?
                        USA_PARITY_ODD : USA_PARITY_EVEN;
        }
        msg.setLcr = 0xff;

        msg.ctsFlowControl = (p_priv->flow_control == flow_cts);
        msg.xonFlowControl = 0;
        msg.setFlowControl = 0xff;
        msg.forwardingLength = 16;
        msg.xonChar = 17;
        msg.xoffChar = 19;

        /* Opening port */
        if (reset_port == 1) {
                msg._txOn = 1;
                msg._txOff = 0;
                msg.txFlush = 0;
                msg.txBreak = 0;
                msg.rxOn = 1;
                msg.rxOff = 0;
                msg.rxFlush = 1;
                msg.rxForward = 0;
                msg.returnStatus = 0;
                msg.resetDataToggle = 0xff;
        }

        /* Closing port */
        else if (reset_port == 2) {
                msg._txOn = 0;
                msg._txOff = 1;
                msg.txFlush = 0;
                msg.txBreak = 0;
                msg.rxOn = 0;
                msg.rxOff = 1;
                msg.rxFlush = 1;
                msg.rxForward = 0;
                msg.returnStatus = 0;
                msg.resetDataToggle = 0;
        }

        /* Sending intermediate configs */
        else {
                msg._txOn = (!p_priv->break_on);
                msg._txOff = 0;
                msg.txFlush = 0;
                msg.txBreak = (p_priv->break_on);
                msg.rxOn = 0;
                msg.rxOff = 0;
                msg.rxFlush = 0;
                msg.rxForward = 0;
                msg.returnStatus = 0;
                msg.resetDataToggle = 0x0;
        }

        /* Do handshaking outputs */
        msg.setTxTriState_setRts = 0xff;
        msg.txTriState_rts = p_priv->rts_state;

        msg.setHskoa_setDtr = 0xff;
        msg.hskoa_dtr = p_priv->dtr_state;

        p_priv->resend_cont = 0;
        memcpy(this_urb->transfer_buffer, &msg, sizeof(msg));

        /* send the data out the device on control endpoint */
        this_urb->transfer_buffer_length = sizeof(msg);

        err = usb_submit_urb(this_urb, GFP_ATOMIC);
        if (err != 0)
                dev_dbg(&port->dev, "%s - usb_submit_urb(setup) failed (%d)\n", __func__, err);
        return 0;
}

static int keyspan_usa28_send_setup(struct usb_serial *serial,
                                    struct usb_serial_port *port,
                                    int reset_port)
{
        struct keyspan_usa28_portControlMessage msg;
        struct keyspan_serial_private           *s_priv;
        struct keyspan_port_private             *p_priv;
        const struct keyspan_device_details     *d_details;
        struct urb                              *this_urb;
        int                                     device_port, err;

        s_priv = usb_get_serial_data(serial);
        p_priv = usb_get_serial_port_data(port);
        d_details = s_priv->device_details;
        device_port = port->number - port->serial->minor;

        /* only do something if we have a bulk out endpoint */
        this_urb = p_priv->outcont_urb;
        if (this_urb == NULL) {
                dev_dbg(&port->dev, "%s - oops no urb.\n", __func__);
                return -1;
        }

        /* Save reset port val for resend.
           Don't overwrite resend for open/close condition. */
        if ((reset_port + 1) > p_priv->resend_cont)
                p_priv->resend_cont = reset_port + 1;
        if (this_urb->status == -EINPROGRESS) {
                dev_dbg(&port->dev, "%s already writing\n", __func__);
                mdelay(5);
                return -1;
        }

        memset(&msg, 0, sizeof(struct keyspan_usa28_portControlMessage));

        msg.setBaudRate = 1;
        if (d_details->calculate_baud_rate(port, p_priv->baud, d_details->baudclk,
                                           &msg.baudHi, &msg.baudLo, NULL,
                                           device_port) == KEYSPAN_INVALID_BAUD_RATE) {
                dev_dbg(&port->dev, "%s - Invalid baud rate requested %d.\n",
                                                __func__, p_priv->baud);
                msg.baudLo = 0xff;
                msg.baudHi = 0xb2;      /* Values for 9600 baud */
        }

        /* If parity is enabled, we must calculate it ourselves. */
        msg.parity = 0;         /* XXX for now */

        msg.ctsFlowControl = (p_priv->flow_control == flow_cts);
        msg.xonFlowControl = 0;

        /* Do handshaking outputs, DTR is inverted relative to RTS */
        msg.rts = p_priv->rts_state;
        msg.dtr = p_priv->dtr_state;

        msg.forwardingLength = 16;
        msg.forwardMs = 10;
        msg.breakThreshold = 45;
        msg.xonChar = 17;
        msg.xoffChar = 19;

        /*msg.returnStatus = 1;
        msg.resetDataToggle = 0xff;*/
        /* Opening port */
        if (reset_port == 1) {
                msg._txOn = 1;
                msg._txOff = 0;
                msg.txFlush = 0;
                msg.txForceXoff = 0;
                msg.txBreak = 0;
                msg.rxOn = 1;
                msg.rxOff = 0;
                msg.rxFlush = 1;
                msg.rxForward = 0;
                msg.returnStatus = 0;
                msg.resetDataToggle = 0xff;
        }
        /* Closing port */
        else if (reset_port == 2) {
                msg._txOn = 0;
                msg._txOff = 1;
                msg.txFlush = 0;
                msg.txForceXoff = 0;
                msg.txBreak = 0;
                msg.rxOn = 0;
                msg.rxOff = 1;
                msg.rxFlush = 1;
                msg.rxForward = 0;
                msg.returnStatus = 0;
                msg.resetDataToggle = 0;
        }
        /* Sending intermediate configs */
        else {
                msg._txOn = (!p_priv->break_on);
                msg._txOff = 0;
                msg.txFlush = 0;
                msg.txForceXoff = 0;
                msg.txBreak = (p_priv->break_on);
                msg.rxOn = 0;
                msg.rxOff = 0;
                msg.rxFlush = 0;
                msg.rxForward = 0;
                msg.returnStatus = 0;
                msg.resetDataToggle = 0x0;
        }

        p_priv->resend_cont = 0;
        memcpy(this_urb->transfer_buffer, &msg, sizeof(msg));

        /* send the data out the device on control endpoint */
        this_urb->transfer_buffer_length = sizeof(msg);

        err = usb_submit_urb(this_urb, GFP_ATOMIC);
        if (err != 0)
                dev_dbg(&port->dev, "%s - usb_submit_urb(setup) failed\n", __func__);
#if 0
        else {
                dev_dbg(&port->dev, "%s - usb_submit_urb(setup) OK %d bytes\n", __func__,
                    this_urb->transfer_buffer_length);
        }
#endif

        return 0;
}

static int keyspan_usa49_send_setup(struct usb_serial *serial,
                                    struct usb_serial_port *port,
                                    int reset_port)
{
        struct keyspan_usa49_portControlMessage msg;
        struct usb_ctrlrequest                  *dr = NULL;
        struct keyspan_serial_private           *s_priv;
        struct keyspan_port_private             *p_priv;
        const struct keyspan_device_details     *d_details;
        struct urb                              *this_urb;
        int                                     err, device_port;

        s_priv = usb_get_serial_data(serial);
        p_priv = usb_get_serial_port_data(port);
        d_details = s_priv->device_details;

        this_urb = s_priv->glocont_urb;

        /* Work out which port within the device is being setup */
        device_port = port->number - port->serial->minor;

        /* Make sure we have an urb then send the message */
        if (this_urb == NULL) {
                dev_dbg(&port->dev, "%s - oops no urb for port %d.\n", __func__, port->number);
                return -1;
        }

        dev_dbg(&port->dev, "%s - endpoint %d port %d (%d)\n",
                __func__, usb_pipeendpoint(this_urb->pipe),
                port->number, device_port);

        /* Save reset port val for resend.
           Don't overwrite resend for open/close condition. */
        if ((reset_port + 1) > p_priv->resend_cont)
                p_priv->resend_cont = reset_port + 1;

        if (this_urb->status == -EINPROGRESS) {
                /*  dev_dbg(&port->dev, "%s - already writing\n", __func__); */
                mdelay(5);
                return -1;
        }

        memset(&msg, 0, sizeof(struct keyspan_usa49_portControlMessage));

        /*msg.portNumber = port->number;*/
        msg.portNumber = device_port;

        /* Only set baud rate if it's changed */
        if (p_priv->old_baud != p_priv->baud) {
                p_priv->old_baud = p_priv->baud;
                msg.setClocking = 0xff;
                if (d_details->calculate_baud_rate(port, p_priv->baud, d_details->baudclk,
                                                   &msg.baudHi, &msg.baudLo, &msg.prescaler,
                                                   device_port) == KEYSPAN_INVALID_BAUD_RATE) {
                        dev_dbg(&port->dev, "%s - Invalid baud rate %d requested, using 9600.\n",
                                __func__, p_priv->baud);
                        msg.baudLo = 0;
                        msg.baudHi = 125;       /* Values for 9600 baud */
                        msg.prescaler = 10;
                }
                /* msg.setPrescaler = 0xff; */
        }

        msg.lcr = (p_priv->cflag & CSTOPB) ? STOPBITS_678_2 : STOPBITS_5678_1;
        switch (p_priv->cflag & CSIZE) {
        case CS5:
                msg.lcr |= USA_DATABITS_5;
                break;
        case CS6:
                msg.lcr |= USA_DATABITS_6;
                break;
        case CS7:
                msg.lcr |= USA_DATABITS_7;
                break;
        case CS8:
                msg.lcr |= USA_DATABITS_8;
                break;
        }
        if (p_priv->cflag & PARENB) {
                /* note USA_PARITY_NONE == 0 */
                msg.lcr |= (p_priv->cflag & PARODD) ?
                        USA_PARITY_ODD : USA_PARITY_EVEN;
        }
        msg.setLcr = 0xff;

        msg.ctsFlowControl = (p_priv->flow_control == flow_cts);
        msg.xonFlowControl = 0;
        msg.setFlowControl = 0xff;

        msg.forwardingLength = 16;
        msg.xonChar = 17;
        msg.xoffChar = 19;

        /* Opening port */
        if (reset_port == 1) {
                msg._txOn = 1;
                msg._txOff = 0;
                msg.txFlush = 0;
                msg.txBreak = 0;
                msg.rxOn = 1;
                msg.rxOff = 0;
                msg.rxFlush = 1;
                msg.rxForward = 0;
                msg.returnStatus = 0;
                msg.resetDataToggle = 0xff;
                msg.enablePort = 1;
                msg.disablePort = 0;
        }
        /* Closing port */
        else if (reset_port == 2) {
                msg._txOn = 0;
                msg._txOff = 1;
                msg.txFlush = 0;
                msg.txBreak = 0;
                msg.rxOn = 0;
                msg.rxOff = 1;
                msg.rxFlush = 1;
                msg.rxForward = 0;
                msg.returnStatus = 0;
                msg.resetDataToggle = 0;
                msg.enablePort = 0;
                msg.disablePort = 1;
        }
        /* Sending intermediate configs */
        else {
                msg._txOn = (!p_priv->break_on);
                msg._txOff = 0;
                msg.txFlush = 0;
                msg.txBreak = (p_priv->break_on);
                msg.rxOn = 0;
                msg.rxOff = 0;
                msg.rxFlush = 0;
                msg.rxForward = 0;
                msg.returnStatus = 0;
                msg.resetDataToggle = 0x0;
                msg.enablePort = 0;
                msg.disablePort = 0;
        }

        /* Do handshaking outputs */
        msg.setRts = 0xff;
        msg.rts = p_priv->rts_state;

        msg.setDtr = 0xff;
        msg.dtr = p_priv->dtr_state;

        p_priv->resend_cont = 0;

        /* if the device is a 49wg, we send control message on usb
           control EP 0 */

        if (d_details->product_id == keyspan_usa49wg_product_id) {
                dr = (void *)(s_priv->ctrl_buf);
                dr->bRequestType = USB_TYPE_VENDOR | USB_DIR_OUT;
                dr->bRequest = 0xB0;    /* 49wg control message */;
                dr->wValue = 0;
                dr->wIndex = 0;
                dr->wLength = cpu_to_le16(sizeof(msg));

                memcpy(s_priv->glocont_buf, &msg, sizeof(msg));

                usb_fill_control_urb(this_urb, serial->dev,
                                usb_sndctrlpipe(serial->dev, 0),
                                (unsigned char *)dr, s_priv->glocont_buf,
                                sizeof(msg), usa49_glocont_callback, serial);

        } else {
                memcpy(this_urb->transfer_buffer, &msg, sizeof(msg));

                /* send the data out the device on control endpoint */
                this_urb->transfer_buffer_length = sizeof(msg);
        }
        err = usb_submit_urb(this_urb, GFP_ATOMIC);
        if (err != 0)
                dev_dbg(&port->dev, "%s - usb_submit_urb(setup) failed (%d)\n", __func__, err);
#if 0
        else {
                dev_dbg(&port->dev, "%s - usb_submit_urb(%d) OK %d bytes (end %d)\n", __func__,
                        outcont_urb, this_urb->transfer_buffer_length,
                        usb_pipeendpoint(this_urb->pipe));
        }
#endif

        return 0;
}

static int keyspan_usa90_send_setup(struct usb_serial *serial,

                                    struct usb_serial_port *port,
                                    int reset_port)
{
        struct keyspan_usa90_portControlMessage msg;
        struct keyspan_serial_private           *s_priv;
        struct keyspan_port_private             *p_priv;
        const struct keyspan_device_details     *d_details;
        struct urb                              *this_urb;
        int                                     err;
        u8                                              prescaler;

        s_priv = usb_get_serial_data(serial);
        p_priv = usb_get_serial_port_data(port);
        d_details = s_priv->device_details;

        /* only do something if we have a bulk out endpoint */
        this_urb = p_priv->outcont_urb;
        if (this_urb == NULL) {
                dev_dbg(&port->dev, "%s - oops no urb.\n", __func__);
                return -1;
        }

        /* Save reset port val for resend.
           Don't overwrite resend for open/close condition. */
        if ((reset_port + 1) > p_priv->resend_cont)
                p_priv->resend_cont = reset_port + 1;
        if (this_urb->status == -EINPROGRESS) {
                dev_dbg(&port->dev, "%s already writing\n", __func__);
                mdelay(5);
                return -1;
        }

        memset(&msg, 0, sizeof(struct keyspan_usa90_portControlMessage));

        /* Only set baud rate if it's changed */
        if (p_priv->old_baud != p_priv->baud) {
                p_priv->old_baud = p_priv->baud;
                msg.setClocking = 0x01;
                if (d_details->calculate_baud_rate(port, p_priv->baud, d_details->baudclk,
                                                   &msg.baudHi, &msg.baudLo, &prescaler, 0) == KEYSPAN_INVALID_BAUD_RATE) {
                        dev_dbg(&port->dev, "%s - Invalid baud rate %d requested, using 9600.\n",
                                __func__, p_priv->baud);
                        p_priv->baud = 9600;
                        d_details->calculate_baud_rate(port, p_priv->baud, d_details->baudclk,
                                &msg.baudHi, &msg.baudLo, &prescaler, 0);
                }
                msg.setRxMode = 1;
                msg.setTxMode = 1;
        }

        /* modes must always be correctly specified */
        if (p_priv->baud > 57600) {
                msg.rxMode = RXMODE_DMA;
                msg.txMode = TXMODE_DMA;
        } else {
                msg.rxMode = RXMODE_BYHAND;
                msg.txMode = TXMODE_BYHAND;
        }

        msg.lcr = (p_priv->cflag & CSTOPB) ? STOPBITS_678_2 : STOPBITS_5678_1;
        switch (p_priv->cflag & CSIZE) {
        case CS5:
                msg.lcr |= USA_DATABITS_5;
                break;
        case CS6:
                msg.lcr |= USA_DATABITS_6;
                break;
        case CS7:
                msg.lcr |= USA_DATABITS_7;
                break;
        case CS8:
                msg.lcr |= USA_DATABITS_8;
                break;
        }
        if (p_priv->cflag & PARENB) {
                /* note USA_PARITY_NONE == 0 */
                msg.lcr |= (p_priv->cflag & PARODD) ?
                        USA_PARITY_ODD : USA_PARITY_EVEN;
        }
        if (p_priv->old_cflag != p_priv->cflag) {
                p_priv->old_cflag = p_priv->cflag;
                msg.setLcr = 0x01;
        }

        if (p_priv->flow_control == flow_cts)
                msg.txFlowControl = TXFLOW_CTS;
        msg.setTxFlowControl = 0x01;
        msg.setRxFlowControl = 0x01;

        msg.rxForwardingLength = 16;
        msg.rxForwardingTimeout = 16;
        msg.txAckSetting = 0;
        msg.xonChar = 17;
        msg.xoffChar = 19;

        /* Opening port */
        if (reset_port == 1) {
                msg.portEnabled = 1;
                msg.rxFlush = 1;
                msg.txBreak = (p_priv->break_on);
        }
        /* Closing port */
        else if (reset_port == 2)
                msg.portEnabled = 0;
        /* Sending intermediate configs */
        else {
                msg.portEnabled = 1;
                msg.txBreak = (p_priv->break_on);
        }

        /* Do handshaking outputs */
        msg.setRts = 0x01;
        msg.rts = p_priv->rts_state;

        msg.setDtr = 0x01;
        msg.dtr = p_priv->dtr_state;

        p_priv->resend_cont = 0;
        memcpy(this_urb->transfer_buffer, &msg, sizeof(msg));

        /* send the data out the device on control endpoint */
        this_urb->transfer_buffer_length = sizeof(msg);

        err = usb_submit_urb(this_urb, GFP_ATOMIC);
        if (err != 0)
                dev_dbg(&port->dev, "%s - usb_submit_urb(setup) failed (%d)\n", __func__, err);
        return 0;
}

static int keyspan_usa67_send_setup(struct usb_serial *serial,
                                    struct usb_serial_port *port,
                                    int reset_port)
{
        struct keyspan_usa67_portControlMessage msg;
        struct keyspan_serial_private           *s_priv;
        struct keyspan_port_private             *p_priv;
        const struct keyspan_device_details     *d_details;
        struct urb                              *this_urb;
        int                                     err, device_port;

        s_priv = usb_get_serial_data(serial);
        p_priv = usb_get_serial_port_data(port);
        d_details = s_priv->device_details;

        this_urb = s_priv->glocont_urb;

        /* Work out which port within the device is being setup */
        device_port = port->number - port->serial->minor;

        /* Make sure we have an urb then send the message */
        if (this_urb == NULL) {
                dev_dbg(&port->dev, "%s - oops no urb for port %d.\n", __func__,
                        port->number);
                return -1;
        }

        /* Save reset port val for resend.
           Don't overwrite resend for open/close condition. */
        if ((reset_port + 1) > p_priv->resend_cont)
                p_priv->resend_cont = reset_port + 1;
        if (this_urb->status == -EINPROGRESS) {
                /*  dev_dbg(&port->dev, "%s - already writing\n", __func__); */
                mdelay(5);
                return -1;
        }

        memset(&msg, 0, sizeof(struct keyspan_usa67_portControlMessage));

        msg.port = device_port;

        /* Only set baud rate if it's changed */
        if (p_priv->old_baud != p_priv->baud) {
                p_priv->old_baud = p_priv->baud;
                msg.setClocking = 0xff;
                if (d_details->calculate_baud_rate(port, p_priv->baud, d_details->baudclk,
                                                   &msg.baudHi, &msg.baudLo, &msg.prescaler,
                                                   device_port) == KEYSPAN_INVALID_BAUD_RATE) {
                        dev_dbg(&port->dev, "%s - Invalid baud rate %d requested, using 9600.\n",
                                __func__, p_priv->baud);
                        msg.baudLo = 0;
                        msg.baudHi = 125;       /* Values for 9600 baud */
                        msg.prescaler = 10;
                }
                msg.setPrescaler = 0xff;
        }

        msg.lcr = (p_priv->cflag & CSTOPB) ? STOPBITS_678_2 : STOPBITS_5678_1;
        switch (p_priv->cflag & CSIZE) {
        case CS5:
                msg.lcr |= USA_DATABITS_5;
                break;
        case CS6:
                msg.lcr |= USA_DATABITS_6;
                break;
        case CS7:
                msg.lcr |= USA_DATABITS_7;
                break;
        case CS8:
                msg.lcr |= USA_DATABITS_8;
                break;
        }
        if (p_priv->cflag & PARENB) {
                /* note USA_PARITY_NONE == 0 */
                msg.lcr |= (p_priv->cflag & PARODD) ?
                                        USA_PARITY_ODD : USA_PARITY_EVEN;
        }
        msg.setLcr = 0xff;

        msg.ctsFlowControl = (p_priv->flow_control == flow_cts);
        msg.xonFlowControl = 0;
        msg.setFlowControl = 0xff;
        msg.forwardingLength = 16;
        msg.xonChar = 17;
        msg.xoffChar = 19;

        if (reset_port == 1) {
                /* Opening port */
                msg._txOn = 1;
                msg._txOff = 0;
                msg.txFlush = 0;
                msg.txBreak = 0;
                msg.rxOn = 1;
                msg.rxOff = 0;
                msg.rxFlush = 1;
                msg.rxForward = 0;
                msg.returnStatus = 0;
                msg.resetDataToggle = 0xff;
        } else if (reset_port == 2) {
                /* Closing port */
                msg._txOn = 0;
                msg._txOff = 1;
                msg.txFlush = 0;
                msg.txBreak = 0;
                msg.rxOn = 0;
                msg.rxOff = 1;
                msg.rxFlush = 1;
                msg.rxForward = 0;
                msg.returnStatus = 0;
                msg.resetDataToggle = 0;
        } else {
                /* Sending intermediate configs */
                msg._txOn = (!p_priv->break_on);
                msg._txOff = 0;
                msg.txFlush = 0;
                msg.txBreak = (p_priv->break_on);
                msg.rxOn = 0;
                msg.rxOff = 0;
                msg.rxFlush = 0;
                msg.rxForward = 0;
                msg.returnStatus = 0;
                msg.resetDataToggle = 0x0;
        }

        /* Do handshaking outputs */
        msg.setTxTriState_setRts = 0xff;
        msg.txTriState_rts = p_priv->rts_state;

        msg.setHskoa_setDtr = 0xff;
        msg.hskoa_dtr = p_priv->dtr_state;

        p_priv->resend_cont = 0;

        memcpy(this_urb->transfer_buffer, &msg, sizeof(msg));

        /* send the data out the device on control endpoint */
        this_urb->transfer_buffer_length = sizeof(msg);

        err = usb_submit_urb(this_urb, GFP_ATOMIC);
        if (err != 0)
                dev_dbg(&port->dev, "%s - usb_submit_urb(setup) failed (%d)\n", __func__, err);
        return 0;
}

static void keyspan_send_setup(struct usb_serial_port *port, int reset_port)
{
        struct usb_serial *serial = port->serial;
        struct keyspan_serial_private *s_priv;
        const struct keyspan_device_details *d_details;

        s_priv = usb_get_serial_data(serial);
        d_details = s_priv->device_details;

        switch (d_details->msg_format) {
        case msg_usa26:
                keyspan_usa26_send_setup(serial, port, reset_port);
                break;
        case msg_usa28:
                keyspan_usa28_send_setup(serial, port, reset_port);
                break;
        case msg_usa49:
                keyspan_usa49_send_setup(serial, port, reset_port);
                break;
        case msg_usa90:
                keyspan_usa90_send_setup(serial, port, reset_port);
                break;
        case msg_usa67:
                keyspan_usa67_send_setup(serial, port, reset_port);
                break;
        }
}


/* Gets called by the "real" driver (ie once firmware is loaded
   and renumeration has taken place. */
static int keyspan_startup(struct usb_serial *serial)
{
        int                             i, err;
        struct keyspan_serial_private   *s_priv;
        const struct keyspan_device_details     *d_details;

        for (i = 0; (d_details = keyspan_devices[i]) != NULL; ++i)
                if (d_details->product_id ==
                                le16_to_cpu(serial->dev->descriptor.idProduct))
                        break;
        if (d_details == NULL) {
                dev_err(&serial->dev->dev, "%s - unknown product id %x\n",
                    __func__, le16_to_cpu(serial->dev->descriptor.idProduct));
                return 1;
        }

        /* Setup private data for serial driver */
        s_priv = kzalloc(sizeof(struct keyspan_serial_private), GFP_KERNEL);
        if (!s_priv) {
                dev_dbg(&serial->dev->dev, "%s - kmalloc for keyspan_serial_private failed.\n", __func__);
                return -ENOMEM;
        }

        s_priv->device_details = d_details;
        usb_set_serial_data(serial, s_priv);

        keyspan_setup_urbs(serial);

        if (s_priv->instat_urb != NULL) {
                err = usb_submit_urb(s_priv->instat_urb, GFP_KERNEL);
                if (err != 0)
                        dev_dbg(&serial->dev->dev, "%s - submit instat urb failed %d\n", __func__, err);
        }
        if (s_priv->indat_urb != NULL) {
                err = usb_submit_urb(s_priv->indat_urb, GFP_KERNEL);
                if (err != 0)
                        dev_dbg(&serial->dev->dev, "%s - submit indat urb failed %d\n", __func__, err);
        }

        return 0;
}

static void keyspan_disconnect(struct usb_serial *serial)
{
        struct keyspan_serial_private *s_priv;

        s_priv = usb_get_serial_data(serial);

        stop_urb(s_priv->instat_urb);
        stop_urb(s_priv->glocont_urb);
        stop_urb(s_priv->indat_urb);
}

static void keyspan_release(struct usb_serial *serial)
{
        struct keyspan_serial_private *s_priv;

        s_priv = usb_get_serial_data(serial);

        usb_free_urb(s_priv->instat_urb);
        usb_free_urb(s_priv->indat_urb);
        usb_free_urb(s_priv->glocont_urb);

        kfree(s_priv);
}

static int keyspan_port_probe(struct usb_serial_port *port)
{
        struct usb_serial *serial = port->serial;
        struct keyspan_serial_private *s_priv;
        struct keyspan_port_private *p_priv;
        const struct keyspan_device_details *d_details;
        struct callbacks *cback;
        int endp;
        int port_num;
        int i;

        s_priv = usb_get_serial_data(serial);
        d_details = s_priv->device_details;

        p_priv = kzalloc(sizeof(*p_priv), GFP_KERNEL);
        if (!p_priv)
                return -ENOMEM;

        p_priv->device_details = d_details;

        /* Setup values for the various callback routines */
        cback = &keyspan_callbacks[d_details->msg_format];

        port_num = port->number - port->serial->minor;

        /* Do indat endpoints first, once for each flip */
        endp = d_details->indat_endpoints[port_num];
        for (i = 0; i <= d_details->indat_endp_flip; ++i, ++endp) {
                p_priv->in_urbs[i] = keyspan_setup_urb(serial, endp,
                                                USB_DIR_IN, port,
                                                p_priv->in_buffer[i], 64,
                                                cback->indat_callback);
        }
        /* outdat endpoints also have flip */
        endp = d_details->outdat_endpoints[port_num];
        for (i = 0; i <= d_details->outdat_endp_flip; ++i, ++endp) {
                p_priv->out_urbs[i] = keyspan_setup_urb(serial, endp,
                                                USB_DIR_OUT, port,
                                                p_priv->out_buffer[i], 64,
                                                cback->outdat_callback);
        }
        /* inack endpoint */
        p_priv->inack_urb = keyspan_setup_urb(serial,
                                        d_details->inack_endpoints[port_num],
                                        USB_DIR_IN, port,
                                        p_priv->inack_buffer, 1,
                                        cback->inack_callback);
        /* outcont endpoint */
        p_priv->outcont_urb = keyspan_setup_urb(serial,
                                        d_details->outcont_endpoints[port_num],
                                        USB_DIR_OUT, port,
                                        p_priv->outcont_buffer, 64,
                                         cback->outcont_callback);

        usb_set_serial_port_data(port, p_priv);

        return 0;
}

static int keyspan_port_remove(struct usb_serial_port *port)
{
        struct keyspan_port_private *p_priv;
        int i;

        p_priv = usb_get_serial_port_data(port);

        stop_urb(p_priv->inack_urb);
        stop_urb(p_priv->outcont_urb);
        for (i = 0; i < 2; i++) {
                stop_urb(p_priv->in_urbs[i]);
                stop_urb(p_priv->out_urbs[i]);
        }

        usb_free_urb(p_priv->inack_urb);
        usb_free_urb(p_priv->outcont_urb);
        for (i = 0; i < 2; i++) {
                usb_free_urb(p_priv->in_urbs[i]);
                usb_free_urb(p_priv->out_urbs[i]);
        }

        kfree(p_priv);

        return 0;
}

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

MODULE_FIRMWARE("keyspan/usa28.fw");
MODULE_FIRMWARE("keyspan/usa28x.fw");
MODULE_FIRMWARE("keyspan/usa28xa.fw");
MODULE_FIRMWARE("keyspan/usa28xb.fw");
MODULE_FIRMWARE("keyspan/usa19.fw");
MODULE_FIRMWARE("keyspan/usa19qi.fw");
MODULE_FIRMWARE("keyspan/mpr.fw");
MODULE_FIRMWARE("keyspan/usa19qw.fw");
MODULE_FIRMWARE("keyspan/usa18x.fw");
MODULE_FIRMWARE("keyspan/usa19w.fw");
MODULE_FIRMWARE("keyspan/usa49w.fw");
MODULE_FIRMWARE("keyspan/usa49wlc.fw");