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ti_usb_3410_5052.c

/* vi: ts=8 sw=8
 *
 * TI 3410/5052 USB Serial Driver
 *
 * Copyright (C) 2004 Texas Instruments
 *
 * This driver is based on the Linux io_ti driver, which is
 *   Copyright (C) 2000-2002 Inside Out Networks
 *   Copyright (C) 2001-2002 Greg Kroah-Hartman
 *
 * 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.
 *
 * For questions or problems with this driver, contact Texas Instruments
 * technical support, or Al Borchers <alborchers@steinerpoint.com>, or
 * Peter Berger <pberger@brimson.com>.
 * 
 * This driver needs this hotplug script in /etc/hotplug/usb/ti_usb_3410_5052
 * or in /etc/hotplug.d/usb/ti_usb_3410_5052.hotplug to set the device
 * configuration.
 *
 * #!/bin/bash
 *
 * BOOT_CONFIG=1
 * ACTIVE_CONFIG=2
 *
 * if [[ "$ACTION" != "add" ]]
 * then
 *    exit
 * fi
 *
 * CONFIG_PATH=/sys${DEVPATH%/?*}/bConfigurationValue
 *
 * if [[ 0`cat $CONFIG_PATH` -ne $BOOT_CONFIG ]]
 * then
 *    exit
 * fi
 *
 * PRODUCT=${PRODUCT%/?*}           # delete version
 * VENDOR_ID=`printf "%d" 0x${PRODUCT%/?*}`
 * PRODUCT_ID=`printf "%d" 0x${PRODUCT#*?/}`
 *
 * PARAM_PATH=/sys/module/ti_usb_3410_5052/parameters
 *
 * function scan() {
 *    s=$1
 *    shift
 *    for i
 *    do
 *          if [[ $s -eq $i ]]
 *          then
 *                return 0
 *          fi
 *    done
 *    return 1
 * }
 *
 * IFS=$IFS,
 *
 * if (scan $VENDOR_ID 1105 `cat $PARAM_PATH/vendor_3410` &&
 * scan $PRODUCT_ID 13328 `cat $PARAM_PATH/product_3410`) ||
 * (scan $VENDOR_ID 1105 `cat $PARAM_PATH/vendor_5052` &&
 * scan $PRODUCT_ID 20562 20818 20570 20575 `cat $PARAM_PATH/product_5052`)
 * then
 *    echo $ACTIVE_CONFIG > $CONFIG_PATH
 * fi
 */

#include <linux/kernel.h>
#include <linux/errno.h>
#include <linux/init.h>
#include <linux/slab.h>
#include <linux/tty.h>
#include <linux/tty_driver.h>
#include <linux/tty_flip.h>
#include <linux/module.h>
#include <linux/spinlock.h>
#include <linux/ioctl.h>
#include <linux/serial.h>
#include <linux/circ_buf.h>
#include <asm/uaccess.h>
#include <asm/semaphore.h>
#include <linux/usb.h>
#include <linux/usb/serial.h>

#include "ti_usb_3410_5052.h"
#include "ti_fw_3410.h"       /* firmware image for 3410 */
#include "ti_fw_5052.h"       /* firmware image for 5052 */


/* Defines */

#define TI_DRIVER_VERSION     "v0.9"
#define TI_DRIVER_AUTHOR      "Al Borchers <alborchers@steinerpoint.com>"
#define TI_DRIVER_DESC        "TI USB 3410/5052 Serial Driver"

#define TI_FIRMWARE_BUF_SIZE  16284

#define TI_WRITE_BUF_SIZE     1024

#define TI_TRANSFER_TIMEOUT   2

#define TI_DEFAULT_LOW_LATENCY      0
#define TI_DEFAULT_CLOSING_WAIT     4000        /* in .01 secs */

/* supported setserial flags */
#define TI_SET_SERIAL_FLAGS   (ASYNC_LOW_LATENCY)

/* read urb states */
#define TI_READ_URB_RUNNING   0
#define TI_READ_URB_STOPPING  1
#define TI_READ_URB_STOPPED   2

#define TI_EXTRA_VID_PID_COUNT      5


/* Structures */

struct ti_port {
      int               tp_is_open;
      __u8              tp_msr;
      __u8              tp_lsr;
      __u8              tp_shadow_mcr;
      __u8              tp_uart_mode;     /* 232 or 485 modes */
      unsigned int            tp_uart_base_addr;
      int               tp_flags;
      int               tp_closing_wait;/* in .01 secs */
      struct async_icount     tp_icount;
      wait_queue_head_t tp_msr_wait;      /* wait for msr change */
      wait_queue_head_t tp_write_wait;
      struct ti_device  *tp_tdev;
      struct usb_serial_port  *tp_port;
      spinlock_t        tp_lock;
      int               tp_read_urb_state;
      int               tp_write_urb_in_use;
      struct circ_buf         *tp_write_buf;
};

struct ti_device {
      struct semaphore  td_open_close_sem;
      int               td_open_port_count;
      struct usb_serial *td_serial;
      int               td_is_3410;
      int               td_urb_error;
};


/* Function Declarations */

static int ti_startup(struct usb_serial *serial);
static void ti_shutdown(struct usb_serial *serial);
static int ti_open(struct usb_serial_port *port, struct file *file);
static void ti_close(struct usb_serial_port *port, struct file *file);
static int ti_write(struct usb_serial_port *port, const unsigned char *data,
      int count);
static int ti_write_room(struct usb_serial_port *port);
static int ti_chars_in_buffer(struct usb_serial_port *port);
static void ti_throttle(struct usb_serial_port *port);
static void ti_unthrottle(struct usb_serial_port *port);
static int ti_ioctl(struct usb_serial_port *port, struct file *file, unsigned int cmd, unsigned long arg);
static void ti_set_termios(struct usb_serial_port *port,
      struct ktermios *old_termios);
static int ti_tiocmget(struct usb_serial_port *port, struct file *file);
static int ti_tiocmset(struct usb_serial_port *port, struct file *file,
      unsigned int set, unsigned int clear);
static void ti_break(struct usb_serial_port *port, int break_state);
static void ti_interrupt_callback(struct urb *urb);
static void ti_bulk_in_callback(struct urb *urb);
static void ti_bulk_out_callback(struct urb *urb);

static void ti_recv(struct device *dev, struct tty_struct *tty,
      unsigned char *data, int length);
static void ti_send(struct ti_port *tport);
static int ti_set_mcr(struct ti_port *tport, unsigned int mcr);
static int ti_get_lsr(struct ti_port *tport);
static int ti_get_serial_info(struct ti_port *tport,
      struct serial_struct __user *ret_arg);
static int ti_set_serial_info(struct ti_port *tport,
      struct serial_struct __user *new_arg);
static void ti_handle_new_msr(struct ti_port *tport, __u8 msr);

static void ti_drain(struct ti_port *tport, unsigned long timeout, int flush);

static void ti_stop_read(struct ti_port *tport, struct tty_struct *tty);
static int ti_restart_read(struct ti_port *tport, struct tty_struct *tty);

static int ti_command_out_sync(struct ti_device *tdev, __u8 command,
      __u16 moduleid, __u16 value, __u8 *data, int size);
static int ti_command_in_sync(struct ti_device *tdev, __u8 command,
      __u16 moduleid, __u16 value, __u8 *data, int size);

static int ti_write_byte(struct ti_device *tdev, unsigned long addr,
      __u8 mask, __u8 byte);

static int ti_download_firmware(struct ti_device *tdev,
      unsigned char *firmware, unsigned int firmware_size);

/* circular buffer */
static struct circ_buf *ti_buf_alloc(void);
static void ti_buf_free(struct circ_buf *cb);
static void ti_buf_clear(struct circ_buf *cb);
static int ti_buf_data_avail(struct circ_buf *cb);
static int ti_buf_space_avail(struct circ_buf *cb);
static int ti_buf_put(struct circ_buf *cb, const char *buf, int count);
static int ti_buf_get(struct circ_buf *cb, char *buf, int count);


/* Data */

/* module parameters */
static int debug;
static int low_latency = TI_DEFAULT_LOW_LATENCY;
static int closing_wait = TI_DEFAULT_CLOSING_WAIT;
static ushort vendor_3410[TI_EXTRA_VID_PID_COUNT];
static unsigned int vendor_3410_count;
static ushort product_3410[TI_EXTRA_VID_PID_COUNT];
static unsigned int product_3410_count;
static ushort vendor_5052[TI_EXTRA_VID_PID_COUNT];
static unsigned int vendor_5052_count;
static ushort product_5052[TI_EXTRA_VID_PID_COUNT];
static unsigned int product_5052_count;

/* supported devices */
/* the array dimension is the number of default entries plus */
/* TI_EXTRA_VID_PID_COUNT user defined entries plus 1 terminating */
/* null entry */
static struct usb_device_id ti_id_table_3410[1+TI_EXTRA_VID_PID_COUNT+1] = {
      { USB_DEVICE(TI_VENDOR_ID, TI_3410_PRODUCT_ID) },
      { USB_DEVICE(TI_VENDOR_ID, TI_3410_EZ430_ID) },
};

static struct usb_device_id ti_id_table_5052[4+TI_EXTRA_VID_PID_COUNT+1] = {
      { USB_DEVICE(TI_VENDOR_ID, TI_5052_BOOT_PRODUCT_ID) },
      { USB_DEVICE(TI_VENDOR_ID, TI_5152_BOOT_PRODUCT_ID) },
      { USB_DEVICE(TI_VENDOR_ID, TI_5052_EEPROM_PRODUCT_ID) },
      { USB_DEVICE(TI_VENDOR_ID, TI_5052_FIRMWARE_PRODUCT_ID) },
};

static struct usb_device_id ti_id_table_combined[] = {
      { USB_DEVICE(TI_VENDOR_ID, TI_3410_PRODUCT_ID) },
      { USB_DEVICE(TI_VENDOR_ID, TI_3410_EZ430_ID) },
      { USB_DEVICE(TI_VENDOR_ID, TI_5052_BOOT_PRODUCT_ID) },
      { USB_DEVICE(TI_VENDOR_ID, TI_5152_BOOT_PRODUCT_ID) },
      { USB_DEVICE(TI_VENDOR_ID, TI_5052_EEPROM_PRODUCT_ID) },
      { USB_DEVICE(TI_VENDOR_ID, TI_5052_FIRMWARE_PRODUCT_ID) },
      { }
};

static struct usb_driver ti_usb_driver = {
      .name             = "ti_usb_3410_5052",
      .probe                  = usb_serial_probe,
      .disconnect       = usb_serial_disconnect,
      .id_table         = ti_id_table_combined,
      .no_dynamic_id =  1,
};

static struct usb_serial_driver ti_1port_device = {
      .driver = {
            .owner            = THIS_MODULE,
            .name       = "ti_usb_3410_5052_1",
      },
      .description            = "TI USB 3410 1 port adapter",
      .usb_driver       = &ti_usb_driver,
      .id_table         = ti_id_table_3410,
      .num_interrupt_in = 1,
      .num_bulk_in            = 1,
      .num_bulk_out           = 1,
      .num_ports        = 1,
      .attach                 = ti_startup,
      .shutdown         = ti_shutdown,
      .open             = ti_open,
      .close                  = ti_close,
      .write                  = ti_write,
      .write_room       = ti_write_room,
      .chars_in_buffer  = ti_chars_in_buffer,
      .throttle         = ti_throttle,
      .unthrottle       = ti_unthrottle,
      .ioctl                  = ti_ioctl,
      .set_termios            = ti_set_termios,
      .tiocmget         = ti_tiocmget,
      .tiocmset         = ti_tiocmset,
      .break_ctl        = ti_break,
      .read_int_callback      = ti_interrupt_callback,
      .read_bulk_callback     = ti_bulk_in_callback,
      .write_bulk_callback    = ti_bulk_out_callback,
};

static struct usb_serial_driver ti_2port_device = {
      .driver = {
            .owner            = THIS_MODULE,
            .name       = "ti_usb_3410_5052_2",
      },
      .description            = "TI USB 5052 2 port adapter",
      .usb_driver       = &ti_usb_driver,
      .id_table         = ti_id_table_5052,
      .num_interrupt_in = 1,
      .num_bulk_in            = 2,
      .num_bulk_out           = 2,
      .num_ports        = 2,
      .attach                 = ti_startup,
      .shutdown         = ti_shutdown,
      .open             = ti_open,
      .close                  = ti_close,
      .write                  = ti_write,
      .write_room       = ti_write_room,
      .chars_in_buffer  = ti_chars_in_buffer,
      .throttle         = ti_throttle,
      .unthrottle       = ti_unthrottle,
      .ioctl                  = ti_ioctl,
      .set_termios            = ti_set_termios,
      .tiocmget         = ti_tiocmget,
      .tiocmset         = ti_tiocmset,
      .break_ctl        = ti_break,
      .read_int_callback      = ti_interrupt_callback,
      .read_bulk_callback     = ti_bulk_in_callback,
      .write_bulk_callback    = ti_bulk_out_callback,
};


/* Module */

MODULE_AUTHOR(TI_DRIVER_AUTHOR);
MODULE_DESCRIPTION(TI_DRIVER_DESC);
MODULE_VERSION(TI_DRIVER_VERSION);
MODULE_LICENSE("GPL");

module_param(debug, bool, S_IRUGO | S_IWUSR);
MODULE_PARM_DESC(debug, "Enable debugging, 0=no, 1=yes");

module_param(low_latency, bool, S_IRUGO | S_IWUSR);
MODULE_PARM_DESC(low_latency, "TTY low_latency flag, 0=off, 1=on, default is off");

module_param(closing_wait, int, S_IRUGO | S_IWUSR);
MODULE_PARM_DESC(closing_wait, "Maximum wait for data to drain in close, in .01 secs, default is 4000");

module_param_array(vendor_3410, ushort, &vendor_3410_count, S_IRUGO);
MODULE_PARM_DESC(vendor_3410, "Vendor ids for 3410 based devices, 1-5 short integers");
module_param_array(product_3410, ushort, &product_3410_count, S_IRUGO);
MODULE_PARM_DESC(product_3410, "Product ids for 3410 based devices, 1-5 short integers");
module_param_array(vendor_5052, ushort, &vendor_5052_count, S_IRUGO);
MODULE_PARM_DESC(vendor_5052, "Vendor ids for 5052 based devices, 1-5 short integers");
module_param_array(product_5052, ushort, &product_5052_count, S_IRUGO);
MODULE_PARM_DESC(product_5052, "Product ids for 5052 based devices, 1-5 short integers");

MODULE_DEVICE_TABLE(usb, ti_id_table_combined);


/* Functions */

static int __init ti_init(void)
{
      int i,j;
      int ret;

      /* insert extra vendor and product ids */
      j = ARRAY_SIZE(ti_id_table_3410) - TI_EXTRA_VID_PID_COUNT - 1;
      for (i=0; i<min(vendor_3410_count,product_3410_count); i++,j++) {
            ti_id_table_3410[j].idVendor = vendor_3410[i];
            ti_id_table_3410[j].idProduct = product_3410[i];
            ti_id_table_3410[j].match_flags = USB_DEVICE_ID_MATCH_DEVICE;
      }
      j = ARRAY_SIZE(ti_id_table_5052) - TI_EXTRA_VID_PID_COUNT - 1;
      for (i=0; i<min(vendor_5052_count,product_5052_count); i++,j++) {
            ti_id_table_5052[j].idVendor = vendor_5052[i];
            ti_id_table_5052[j].idProduct = product_5052[i];
            ti_id_table_5052[j].match_flags = USB_DEVICE_ID_MATCH_DEVICE;
      }

      ret = usb_serial_register(&ti_1port_device);
      if (ret)
            goto failed_1port;
      ret = usb_serial_register(&ti_2port_device);
      if (ret)
            goto failed_2port;

      ret = usb_register(&ti_usb_driver);
      if (ret)
            goto failed_usb;

      info(TI_DRIVER_DESC " " TI_DRIVER_VERSION);

      return 0;

failed_usb:
      usb_serial_deregister(&ti_2port_device);
failed_2port:
      usb_serial_deregister(&ti_1port_device);
failed_1port:
      return ret;
}


static void __exit ti_exit(void)
{
      usb_serial_deregister(&ti_1port_device);
      usb_serial_deregister(&ti_2port_device);
      usb_deregister(&ti_usb_driver);
}


module_init(ti_init);
module_exit(ti_exit);


static int ti_startup(struct usb_serial *serial)
{
      struct ti_device *tdev;
      struct ti_port *tport;
      struct usb_device *dev = serial->dev;
      int status;
      int i;


      dbg("%s - product 0x%4X, num configurations %d, configuration value %d",
          __FUNCTION__, le16_to_cpu(dev->descriptor.idProduct),
          dev->descriptor.bNumConfigurations,
          dev->actconfig->desc.bConfigurationValue);

      /* create device structure */
      tdev = kzalloc(sizeof(struct ti_device), GFP_KERNEL);
      if (tdev == NULL) {
            dev_err(&dev->dev, "%s - out of memory\n", __FUNCTION__);
            return -ENOMEM;
      }
      sema_init(&tdev->td_open_close_sem, 1);
      tdev->td_serial = serial;
      usb_set_serial_data(serial, tdev);

      /* determine device type */
      if (usb_match_id(serial->interface, ti_id_table_3410))
            tdev->td_is_3410 = 1;
      dbg("%s - device type is %s", __FUNCTION__, tdev->td_is_3410 ? "3410" : "5052");

      /* if we have only 1 configuration, download firmware */
      if (dev->descriptor.bNumConfigurations == 1) {

            if (tdev->td_is_3410)
                  status = ti_download_firmware(tdev, ti_fw_3410,
                        sizeof(ti_fw_3410));
            else
                  status = ti_download_firmware(tdev, ti_fw_5052,
                        sizeof(ti_fw_5052));
            if (status)
                  goto free_tdev;

            /* 3410 must be reset, 5052 resets itself */
            if (tdev->td_is_3410) {
                  msleep_interruptible(100);
                  usb_reset_device(dev);
            }

            status = -ENODEV;
            goto free_tdev;
      } 

      /* the second configuration must be set (in sysfs by hotplug script) */
      if (dev->actconfig->desc.bConfigurationValue == TI_BOOT_CONFIG) {
            status = -ENODEV;
            goto free_tdev;
      }

      /* set up port structures */
      for (i = 0; i < serial->num_ports; ++i) {
            tport = kzalloc(sizeof(struct ti_port), GFP_KERNEL);
            if (tport == NULL) {
                  dev_err(&dev->dev, "%s - out of memory\n", __FUNCTION__);
                  status = -ENOMEM;
                  goto free_tports;
            }
            spin_lock_init(&tport->tp_lock);
            tport->tp_uart_base_addr = (i == 0 ? TI_UART1_BASE_ADDR : TI_UART2_BASE_ADDR);
            tport->tp_flags = low_latency ? ASYNC_LOW_LATENCY : 0;
            tport->tp_closing_wait = closing_wait;
            init_waitqueue_head(&tport->tp_msr_wait);
            init_waitqueue_head(&tport->tp_write_wait);
            tport->tp_write_buf = ti_buf_alloc();
            if (tport->tp_write_buf == NULL) {
                  dev_err(&dev->dev, "%s - out of memory\n", __FUNCTION__);
                  kfree(tport);
                  status = -ENOMEM;
                  goto free_tports;
            }
            tport->tp_port = serial->port[i];
            tport->tp_tdev = tdev;
            usb_set_serial_port_data(serial->port[i], tport);
            tport->tp_uart_mode = 0;      /* default is RS232 */
      }
      
      return 0;

free_tports:
      for (--i; i>=0; --i) {
            tport = usb_get_serial_port_data(serial->port[i]);
            ti_buf_free(tport->tp_write_buf);
            kfree(tport);
            usb_set_serial_port_data(serial->port[i], NULL);
      }
free_tdev:
      kfree(tdev);
      usb_set_serial_data(serial, NULL);
      return status;
}


static void ti_shutdown(struct usb_serial *serial)
{
      int i;
      struct ti_device *tdev = usb_get_serial_data(serial);
      struct ti_port *tport;

      dbg("%s", __FUNCTION__);

      for (i=0; i < serial->num_ports; ++i) {
            tport = usb_get_serial_port_data(serial->port[i]);
            if (tport) {
                  ti_buf_free(tport->tp_write_buf);
                  kfree(tport);
                  usb_set_serial_port_data(serial->port[i], NULL);
            }
      }

      kfree(tdev);
      usb_set_serial_data(serial, NULL);
}


static int ti_open(struct usb_serial_port *port, struct file *file)
{
      struct ti_port *tport = usb_get_serial_port_data(port);
      struct ti_device *tdev;
      struct usb_device *dev;
      struct urb *urb;
      int port_number;
      int status;
      __u16 open_settings = (__u8)(TI_PIPE_MODE_CONTINOUS | 
                       TI_PIPE_TIMEOUT_ENABLE | 
                       (TI_TRANSFER_TIMEOUT << 2));

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

      if (tport == NULL)
            return -ENODEV;

      dev = port->serial->dev;
      tdev = tport->tp_tdev;

      /* only one open on any port on a device at a time */
      if (down_interruptible(&tdev->td_open_close_sem))
            return -ERESTARTSYS;

      if (port->tty)
            port->tty->low_latency = 
                  (tport->tp_flags & ASYNC_LOW_LATENCY) ? 1 : 0;

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

      memset(&(tport->tp_icount), 0x00, sizeof(tport->tp_icount));

      tport->tp_msr = 0;
      tport->tp_shadow_mcr |= (TI_MCR_RTS | TI_MCR_DTR);

      /* start interrupt urb the first time a port is opened on this device */
      if (tdev->td_open_port_count == 0) {
            dbg("%s - start interrupt in urb", __FUNCTION__);
            urb = tdev->td_serial->port[0]->interrupt_in_urb;
            if (!urb) {
                  dev_err(&port->dev, "%s - no interrupt urb\n", __FUNCTION__);
                  status = -EINVAL;
                  goto up_sem;
            }
            urb->complete = ti_interrupt_callback;
            urb->context = tdev;
            urb->dev = dev;
            status = usb_submit_urb(urb, GFP_KERNEL);
            if (status) {
                  dev_err(&port->dev, "%s - submit interrupt urb failed, %d\n", __FUNCTION__, status);
                  goto up_sem;
            }
      }

      ti_set_termios(port, NULL);

      dbg("%s - sending TI_OPEN_PORT", __FUNCTION__);
      status = ti_command_out_sync(tdev, TI_OPEN_PORT,
            (__u8)(TI_UART1_PORT + port_number), open_settings, NULL, 0);
      if (status) {
            dev_err(&port->dev, "%s - cannot send open command, %d\n", __FUNCTION__, status);
            goto unlink_int_urb;
      }

      dbg("%s - sending TI_START_PORT", __FUNCTION__);
      status = ti_command_out_sync(tdev, TI_START_PORT,
            (__u8)(TI_UART1_PORT + port_number), 0, NULL, 0);
      if (status) {
            dev_err(&port->dev, "%s - cannot send start command, %d\n", __FUNCTION__, status);
            goto unlink_int_urb;
      }

      dbg("%s - sending TI_PURGE_PORT", __FUNCTION__);
      status = ti_command_out_sync(tdev, TI_PURGE_PORT,
            (__u8)(TI_UART1_PORT + port_number), TI_PURGE_INPUT, NULL, 0);
      if (status) {
            dev_err(&port->dev, "%s - cannot clear input buffers, %d\n", __FUNCTION__, status);
            goto unlink_int_urb;
      }
      status = ti_command_out_sync(tdev, TI_PURGE_PORT,
            (__u8)(TI_UART1_PORT + port_number), TI_PURGE_OUTPUT, NULL, 0);
      if (status) {
            dev_err(&port->dev, "%s - cannot clear output buffers, %d\n", __FUNCTION__, status);
            goto unlink_int_urb;
      }

      /* reset the data toggle on the bulk endpoints to work around bug in
       * host controllers where things get out of sync some times */
      usb_clear_halt(dev, port->write_urb->pipe);
      usb_clear_halt(dev, port->read_urb->pipe);

      ti_set_termios(port, NULL);

      dbg("%s - sending TI_OPEN_PORT (2)", __FUNCTION__);
      status = ti_command_out_sync(tdev, TI_OPEN_PORT,
            (__u8)(TI_UART1_PORT + port_number), open_settings, NULL, 0);
      if (status) {
            dev_err(&port->dev, "%s - cannot send open command (2), %d\n", __FUNCTION__, status);
            goto unlink_int_urb;
      }

      dbg("%s - sending TI_START_PORT (2)", __FUNCTION__);
      status = ti_command_out_sync(tdev, TI_START_PORT,
            (__u8)(TI_UART1_PORT + port_number), 0, NULL, 0);
      if (status) {
            dev_err(&port->dev, "%s - cannot send start command (2), %d\n", __FUNCTION__, status);
            goto unlink_int_urb;
      }

      /* start read urb */
      dbg("%s - start read urb", __FUNCTION__);
      urb = port->read_urb;
      if (!urb) {
            dev_err(&port->dev, "%s - no read urb\n", __FUNCTION__);
            status = -EINVAL;
            goto unlink_int_urb;
      }
      tport->tp_read_urb_state = TI_READ_URB_RUNNING;
      urb->complete = ti_bulk_in_callback;
      urb->context = tport;
      urb->dev = dev;
      status = usb_submit_urb(urb, GFP_KERNEL);
      if (status) {
            dev_err(&port->dev, "%s - submit read urb failed, %d\n", __FUNCTION__, status);
            goto unlink_int_urb;
      }

      tport->tp_is_open = 1;
      ++tdev->td_open_port_count;

      goto up_sem;

unlink_int_urb:
      if (tdev->td_open_port_count == 0)
            usb_kill_urb(port->serial->port[0]->interrupt_in_urb);
up_sem:
      up(&tdev->td_open_close_sem);
      dbg("%s - exit %d", __FUNCTION__, status);
      return status;
}


static void ti_close(struct usb_serial_port *port, struct file *file)
{
      struct ti_device *tdev;
      struct ti_port *tport;
      int port_number;
      int status;
      int do_up;

      dbg("%s - port %d", __FUNCTION__, port->number);
                   
      tdev = usb_get_serial_data(port->serial);
      tport = usb_get_serial_port_data(port);
      if (tdev == NULL || tport == NULL)
            return;

      tport->tp_is_open = 0;

      ti_drain(tport, (tport->tp_closing_wait*HZ)/100, 1);

      usb_kill_urb(port->read_urb);
      usb_kill_urb(port->write_urb);
      tport->tp_write_urb_in_use = 0;

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

      dbg("%s - sending TI_CLOSE_PORT", __FUNCTION__);
      status = ti_command_out_sync(tdev, TI_CLOSE_PORT,
                 (__u8)(TI_UART1_PORT + port_number), 0, NULL, 0);
      if (status)
            dev_err(&port->dev, "%s - cannot send close port command, %d\n" , __FUNCTION__, status);

      /* if down is interrupted, continue anyway */
      do_up = !down_interruptible(&tdev->td_open_close_sem);
      --tport->tp_tdev->td_open_port_count;
      if (tport->tp_tdev->td_open_port_count <= 0) {
            /* last port is closed, shut down interrupt urb */
            usb_kill_urb(port->serial->port[0]->interrupt_in_urb);
            tport->tp_tdev->td_open_port_count = 0;
      }
      if (do_up)
            up(&tdev->td_open_close_sem);

      dbg("%s - exit", __FUNCTION__);
}


static int ti_write(struct usb_serial_port *port, const unsigned char *data,
      int count)
{
      struct ti_port *tport = usb_get_serial_port_data(port);
      unsigned long flags;

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

      if (count == 0) {
            dbg("%s - write request of 0 bytes", __FUNCTION__);
            return 0;
      }

      if (tport == NULL || !tport->tp_is_open)
            return -ENODEV;

      spin_lock_irqsave(&tport->tp_lock, flags);
      count = ti_buf_put(tport->tp_write_buf, data, count);
      spin_unlock_irqrestore(&tport->tp_lock, flags);

      ti_send(tport);

      return count;
}


static int ti_write_room(struct usb_serial_port *port)
{
      struct ti_port *tport = usb_get_serial_port_data(port);
      int room = 0;
      unsigned long flags;

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

      if (tport == NULL)
            return -ENODEV;
      
      spin_lock_irqsave(&tport->tp_lock, flags);
      room = ti_buf_space_avail(tport->tp_write_buf);
      spin_unlock_irqrestore(&tport->tp_lock, flags);

      dbg("%s - returns %d", __FUNCTION__, room);
      return room;
}


static int ti_chars_in_buffer(struct usb_serial_port *port)
{
      struct ti_port *tport = usb_get_serial_port_data(port);
      int chars = 0;
      unsigned long flags;

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

      if (tport == NULL)
            return -ENODEV;

      spin_lock_irqsave(&tport->tp_lock, flags);
      chars = ti_buf_data_avail(tport->tp_write_buf);
      spin_unlock_irqrestore(&tport->tp_lock, flags);

      dbg("%s - returns %d", __FUNCTION__, chars);
      return chars;
}


static void ti_throttle(struct usb_serial_port *port)
{
      struct ti_port *tport = usb_get_serial_port_data(port);
      struct tty_struct *tty;

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

      if (tport == NULL)
            return;

      tty = port->tty;
      if (!tty) {
            dbg("%s - no tty", __FUNCTION__);
            return;
      }

      if (I_IXOFF(tty) || C_CRTSCTS(tty))
            ti_stop_read(tport, tty);

}


static void ti_unthrottle(struct usb_serial_port *port)
{
      struct ti_port *tport = usb_get_serial_port_data(port);
      struct tty_struct *tty;
      int status;

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

      if (tport == NULL)
            return;

      tty = port->tty;
      if (!tty) {
            dbg("%s - no tty", __FUNCTION__);
            return;
      }

      if (I_IXOFF(tty) || C_CRTSCTS(tty)) {
            status = ti_restart_read(tport, tty);
            if (status)
                  dev_err(&port->dev, "%s - cannot restart read, %d\n", __FUNCTION__, status);
      }
}


static int ti_ioctl(struct usb_serial_port *port, struct file *file,
      unsigned int cmd, unsigned long arg)
{
      struct ti_port *tport = usb_get_serial_port_data(port);
      struct async_icount cnow;
      struct async_icount cprev;

      dbg("%s - port %d, cmd = 0x%04X", __FUNCTION__, port->number, cmd);

      if (tport == NULL)
            return -ENODEV;

      switch (cmd) {
            case TIOCGSERIAL:
                  dbg("%s - (%d) TIOCGSERIAL", __FUNCTION__, port->number);
                  return ti_get_serial_info(tport, (struct serial_struct __user *)arg);
                  break;

            case TIOCSSERIAL:
                  dbg("%s - (%d) TIOCSSERIAL", __FUNCTION__, port->number);
                  return ti_set_serial_info(tport, (struct serial_struct __user *)arg);
                  break;

            case TIOCMIWAIT:
                  dbg("%s - (%d) TIOCMIWAIT", __FUNCTION__, port->number);
                  cprev = tport->tp_icount;
                  while (1) {
                        interruptible_sleep_on(&tport->tp_msr_wait);
                        if (signal_pending(current))
                              return -ERESTARTSYS;
                        cnow = tport->tp_icount;
                        if (cnow.rng == cprev.rng && cnow.dsr == cprev.dsr &&
                            cnow.dcd == cprev.dcd && cnow.cts == cprev.cts)
                              return -EIO; /* no change => error */
                        if (((arg & TIOCM_RNG) && (cnow.rng != cprev.rng)) ||
                            ((arg & TIOCM_DSR) && (cnow.dsr != cprev.dsr)) ||
                            ((arg & TIOCM_CD)  && (cnow.dcd != cprev.dcd)) ||
                            ((arg & TIOCM_CTS) && (cnow.cts != cprev.cts)) ) {
                              return 0;
                        }
                        cprev = cnow;
                  }
                  break;

            case TIOCGICOUNT:
                  dbg("%s - (%d) TIOCGICOUNT RX=%d, TX=%d", __FUNCTION__, port->number, tport->tp_icount.rx, tport->tp_icount.tx);
                  if (copy_to_user((void __user *)arg, &tport->tp_icount, sizeof(tport->tp_icount)))
                        return -EFAULT;
                  return 0;
      }

      return -ENOIOCTLCMD;
}


static void ti_set_termios(struct usb_serial_port *port,
      struct ktermios *old_termios)
{
      struct ti_port *tport = usb_get_serial_port_data(port);
      struct tty_struct *tty = port->tty;
      struct ti_uart_config *config;
      tcflag_t cflag,iflag;
      int baud;
      int status;
      int port_number = port->number - port->serial->minor;
      unsigned int mcr;

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

      if (!tty || !tty->termios) {
            dbg("%s - no tty or termios", __FUNCTION__);
            return;
      }

      cflag = tty->termios->c_cflag;
      iflag = tty->termios->c_iflag;

      if (old_termios && cflag == old_termios->c_cflag
      && iflag == old_termios->c_iflag) {
            dbg("%s - nothing to change", __FUNCTION__);
            return;
      }

      dbg("%s - clfag %08x, iflag %08x", __FUNCTION__, cflag, iflag);

      if (old_termios)
            dbg("%s - old clfag %08x, old iflag %08x", __FUNCTION__, old_termios->c_cflag, old_termios->c_iflag);

      if (tport == NULL)
            return;

      config = kmalloc(sizeof(*config), GFP_KERNEL);
      if (!config) {
            dev_err(&port->dev, "%s - out of memory\n", __FUNCTION__);
            return;
      }

      config->wFlags = 0;

      /* these flags must be set */
      config->wFlags |= TI_UART_ENABLE_MS_INTS;
      config->wFlags |= TI_UART_ENABLE_AUTO_START_DMA;
      config->bUartMode = (__u8)(tport->tp_uart_mode);

      switch (cflag & CSIZE) {
            case CS5:
                      config->bDataBits = TI_UART_5_DATA_BITS;
                      break;
            case CS6:
                      config->bDataBits = TI_UART_6_DATA_BITS;
                      break;
            case CS7:
                      config->bDataBits = TI_UART_7_DATA_BITS;
                      break;
            default:
            case CS8:
                      config->bDataBits = TI_UART_8_DATA_BITS;
                      break;
      }

      if (cflag & PARENB) {
            if (cflag & PARODD) {
                  config->wFlags |= TI_UART_ENABLE_PARITY_CHECKING;
                  config->bParity = TI_UART_ODD_PARITY;
            } else {
                  config->wFlags |= TI_UART_ENABLE_PARITY_CHECKING;
                  config->bParity = TI_UART_EVEN_PARITY;
            }
      } else {
            config->wFlags &= ~TI_UART_ENABLE_PARITY_CHECKING;
            config->bParity = TI_UART_NO_PARITY;      
      }

      if (cflag & CSTOPB)
            config->bStopBits = TI_UART_2_STOP_BITS;
      else
            config->bStopBits = TI_UART_1_STOP_BITS;

      if (cflag & CRTSCTS) {
            /* RTS flow control must be off to drop RTS for baud rate B0 */
            if ((cflag & CBAUD) != B0)
                  config->wFlags |= TI_UART_ENABLE_RTS_IN;
            config->wFlags |= TI_UART_ENABLE_CTS_OUT;
      } else {
            tty->hw_stopped = 0;
            ti_restart_read(tport, tty);
      }

      if (I_IXOFF(tty) || I_IXON(tty)) {
            config->cXon  = START_CHAR(tty);
            config->cXoff = STOP_CHAR(tty);

            if (I_IXOFF(tty))
                  config->wFlags |= TI_UART_ENABLE_X_IN;
            else
                  ti_restart_read(tport, tty);

            if (I_IXON(tty))
                  config->wFlags |= TI_UART_ENABLE_X_OUT;
      }

      baud = tty_get_baud_rate(tty);
      if (!baud) baud = 9600;
      if (tport->tp_tdev->td_is_3410)
            config->wBaudRate = (__u16)((923077 + baud/2) / baud);
      else
            config->wBaudRate = (__u16)((461538 + baud/2) / baud);

      dbg("%s - BaudRate=%d, wBaudRate=%d, wFlags=0x%04X, bDataBits=%d, bParity=%d, bStopBits=%d, cXon=%d, cXoff=%d, bUartMode=%d",
      __FUNCTION__, baud, config->wBaudRate, config->wFlags, config->bDataBits, config->bParity, config->bStopBits, config->cXon, config->cXoff, config->bUartMode);

      cpu_to_be16s(&config->wBaudRate);
      cpu_to_be16s(&config->wFlags);

      status = ti_command_out_sync(tport->tp_tdev, TI_SET_CONFIG,
            (__u8)(TI_UART1_PORT + port_number), 0, (__u8 *)config,
            sizeof(*config));
      if (status)
            dev_err(&port->dev, "%s - cannot set config on port %d, %d\n", __FUNCTION__, port_number, status);

      /* SET_CONFIG asserts RTS and DTR, reset them correctly */
      mcr = tport->tp_shadow_mcr;
      /* if baud rate is B0, clear RTS and DTR */
      if ((cflag & CBAUD) == B0)
            mcr &= ~(TI_MCR_DTR | TI_MCR_RTS);
      status = ti_set_mcr(tport, mcr);
      if (status)
            dev_err(&port->dev, "%s - cannot set modem control on port %d, %d\n", __FUNCTION__, port_number, status);

      kfree(config);
}


static int ti_tiocmget(struct usb_serial_port *port, struct file *file)
{
      struct ti_port *tport = usb_get_serial_port_data(port);
      unsigned int result;
      unsigned int msr;
      unsigned int mcr;

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

      if (tport == NULL)
            return -ENODEV;

      msr = tport->tp_msr;
      mcr = tport->tp_shadow_mcr;

      result = ((mcr & TI_MCR_DTR) ? TIOCM_DTR : 0)
            | ((mcr & TI_MCR_RTS) ? TIOCM_RTS : 0)
            | ((mcr & TI_MCR_LOOP) ? TIOCM_LOOP : 0)
            | ((msr & TI_MSR_CTS) ? TIOCM_CTS : 0)
            | ((msr & TI_MSR_CD) ? TIOCM_CAR : 0)
            | ((msr & TI_MSR_RI) ? TIOCM_RI : 0)
            | ((msr & TI_MSR_DSR) ? TIOCM_DSR : 0);

      dbg("%s - 0x%04X", __FUNCTION__, result);

      return result;
}


static int ti_tiocmset(struct usb_serial_port *port, struct file *file,
      unsigned int set, unsigned int clear)
{
      struct ti_port *tport = usb_get_serial_port_data(port);
      unsigned int mcr;

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

      if (tport == NULL)
            return -ENODEV;

      mcr = tport->tp_shadow_mcr;

      if (set & TIOCM_RTS)
            mcr |= TI_MCR_RTS;
      if (set & TIOCM_DTR)
            mcr |= TI_MCR_DTR;
      if (set & TIOCM_LOOP)
            mcr |= TI_MCR_LOOP;

      if (clear & TIOCM_RTS)
            mcr &= ~TI_MCR_RTS;
      if (clear & TIOCM_DTR)
            mcr &= ~TI_MCR_DTR;
      if (clear & TIOCM_LOOP)
            mcr &= ~TI_MCR_LOOP;

      return ti_set_mcr(tport, mcr);
}


static void ti_break(struct usb_serial_port *port, int break_state)
{
      struct ti_port *tport = usb_get_serial_port_data(port);
      int status;

      dbg("%s - state = %d", __FUNCTION__, break_state);

      if (tport == NULL)
            return;

      ti_drain(tport, (tport->tp_closing_wait*HZ)/100, 0);

      status = ti_write_byte(tport->tp_tdev,
            tport->tp_uart_base_addr + TI_UART_OFFSET_LCR,
            TI_LCR_BREAK, break_state == -1 ? TI_LCR_BREAK : 0);

      if (status)
            dbg("%s - error setting break, %d", __FUNCTION__, status);
}


static void ti_interrupt_callback(struct urb *urb)
{
      struct ti_device *tdev = (struct ti_device *)urb->context;
      struct usb_serial_port *port;
      struct usb_serial *serial = tdev->td_serial;
      struct ti_port *tport;
      struct device *dev = &urb->dev->dev;
      unsigned char *data = urb->transfer_buffer;
      int length = urb->actual_length;
      int port_number;
      int function;
      int status = urb->status;
      int retval;
      __u8 msr;

      dbg("%s", __FUNCTION__);

      switch (status) {
      case 0:
            break;
      case -ECONNRESET:
      case -ENOENT:
      case -ESHUTDOWN:
            dbg("%s - urb shutting down, %d", __FUNCTION__, status);
            tdev->td_urb_error = 1;
            return;
      default:
            dev_err(dev, "%s - nonzero urb status, %d\n",
                  __FUNCTION__, status);
            tdev->td_urb_error = 1;
            goto exit;
      }

      if (length != 2) {
            dbg("%s - bad packet size, %d", __FUNCTION__, length);
            goto exit;
      }

      if (data[0] == TI_CODE_HARDWARE_ERROR) {
            dev_err(dev, "%s - hardware error, %d\n", __FUNCTION__, data[1]);
            goto exit;
      }

      port_number = TI_GET_PORT_FROM_CODE(data[0]);
      function = TI_GET_FUNC_FROM_CODE(data[0]);

      dbg("%s - port_number %d, function %d, data 0x%02X", __FUNCTION__, port_number, function, data[1]);

      if (port_number >= serial->num_ports) {
            dev_err(dev, "%s - bad port number, %d\n", __FUNCTION__, port_number);
            goto exit;
      }

      port = serial->port[port_number];

      tport = usb_get_serial_port_data(port);
      if (!tport)
            goto exit;

      switch (function) {
      case TI_CODE_DATA_ERROR:
            dev_err(dev, "%s - DATA ERROR, port %d, data 0x%02X\n", __FUNCTION__, port_number, data[1]);
            break;

      case TI_CODE_MODEM_STATUS:
            msr = data[1];
            dbg("%s - port %d, msr 0x%02X", __FUNCTION__, port_number, msr);
            ti_handle_new_msr(tport, msr);
            break;

      default:
            dev_err(dev, "%s - unknown interrupt code, 0x%02X\n", __FUNCTION__, data[1]);
            break;
      }

exit:
      retval = usb_submit_urb(urb, GFP_ATOMIC);
      if (retval)
            dev_err(dev, "%s - resubmit interrupt urb failed, %d\n",
                  __FUNCTION__, retval);
}


static void ti_bulk_in_callback(struct urb *urb)
{
      struct ti_port *tport = (struct ti_port *)urb->context;
      struct usb_serial_port *port = tport->tp_port;
      struct device *dev = &urb->dev->dev;
      int status = urb->status;
      int retval = 0;

      dbg("%s", __FUNCTION__);

      switch (status) {
      case 0:
            break;
      case -ECONNRESET:
      case -ENOENT:
      case -ESHUTDOWN:
            dbg("%s - urb shutting down, %d", __FUNCTION__, status);
            tport->tp_tdev->td_urb_error = 1;
            wake_up_interruptible(&tport->tp_write_wait);
            return;
      default:
            dev_err(dev, "%s - nonzero urb status, %d\n",
                  __FUNCTION__, status );
            tport->tp_tdev->td_urb_error = 1;
            wake_up_interruptible(&tport->tp_write_wait);
      }

      if (status == -EPIPE)
            goto exit;

      if (status) {
            dev_err(dev, "%s - stopping read!\n", __FUNCTION__);
            return;
      }

      if (port->tty && urb->actual_length) {
            usb_serial_debug_data(debug, dev, __FUNCTION__,
                  urb->actual_length, urb->transfer_buffer);

            if (!tport->tp_is_open)
                  dbg("%s - port closed, dropping data", __FUNCTION__);
            else
                  ti_recv(&urb->dev->dev, port->tty, urb->transfer_buffer,
                        urb->actual_length);

            spin_lock(&tport->tp_lock);
            tport->tp_icount.rx += urb->actual_length;
            spin_unlock(&tport->tp_lock);
      }

exit:
      /* continue to read unless stopping */
      spin_lock(&tport->tp_lock);
      if (tport->tp_read_urb_state == TI_READ_URB_RUNNING) {
            urb->dev = port->serial->dev;
            retval = usb_submit_urb(urb, GFP_ATOMIC);
      } else if (tport->tp_read_urb_state == TI_READ_URB_STOPPING) {
            tport->tp_read_urb_state = TI_READ_URB_STOPPED;
      }
      spin_unlock(&tport->tp_lock);
      if (retval)
            dev_err(dev, "%s - resubmit read urb failed, %d\n",
                  __FUNCTION__, retval);
}


static void ti_bulk_out_callback(struct urb *urb)
{
      struct ti_port *tport = (struct ti_port *)urb->context;
      struct usb_serial_port *port = tport->tp_port;
      struct device *dev = &urb->dev->dev;
      int status = urb->status;

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

      tport->tp_write_urb_in_use = 0;

      switch (status) {
      case 0:
            break;
      case -ECONNRESET:
      case -ENOENT:
      case -ESHUTDOWN:
            dbg("%s - urb shutting down, %d", __FUNCTION__, status);
            tport->tp_tdev->td_urb_error = 1;
            wake_up_interruptible(&tport->tp_write_wait);
            return;
      default:
            dev_err(dev, "%s - nonzero urb status, %d\n",
                  __FUNCTION__, status);
            tport->tp_tdev->td_urb_error = 1;
            wake_up_interruptible(&tport->tp_write_wait);
      }

      /* send any buffered data */
      ti_send(tport);
}


static void ti_recv(struct device *dev, struct tty_struct *tty,
      unsigned char *data, int length)
{
      int cnt;

      do {
            cnt = tty_buffer_request_room(tty, length);
            if (cnt < length) {
                  dev_err(dev, "%s - dropping data, %d bytes lost\n", __FUNCTION__, length - cnt);
                  if(cnt == 0)
                        break;
            }
            tty_insert_flip_string(tty, data, cnt);
            tty_flip_buffer_push(tty);
            data += cnt;
            length -= cnt;
      } while (length > 0);

}


static void ti_send(struct ti_port *tport)
{
      int count, result;
      struct usb_serial_port *port = tport->tp_port;
      struct tty_struct *tty = port->tty;
      unsigned long flags;


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

      spin_lock_irqsave(&tport->tp_lock, flags);

      if (tport->tp_write_urb_in_use) {
            spin_unlock_irqrestore(&tport->tp_lock, flags);
            return;
      }

      count = ti_buf_get(tport->tp_write_buf,
                        port->write_urb->transfer_buffer,
                        port->bulk_out_size);

      if (count == 0) {
            spin_unlock_irqrestore(&tport->tp_lock, flags);
            return;
      }

      tport->tp_write_urb_in_use = 1;

      spin_unlock_irqrestore(&tport->tp_lock, flags);

      usb_serial_debug_data(debug, &port->dev, __FUNCTION__, count, port->write_urb->transfer_buffer);

      usb_fill_bulk_urb(port->write_urb, port->serial->dev,
                     usb_sndbulkpipe(port->serial->dev,
                                  port->bulk_out_endpointAddress),
                     port->write_urb->transfer_buffer, count,
                     ti_bulk_out_callback, tport);

      result = usb_submit_urb(port->write_urb, GFP_ATOMIC);
      if (result) {
            dev_err(&port->dev, "%s - submit write urb failed, %d\n", __FUNCTION__, result);
            tport->tp_write_urb_in_use = 0; 
            /* TODO: reschedule ti_send */
      } else {
            spin_lock_irqsave(&tport->tp_lock, flags);
            tport->tp_icount.tx += count;
            spin_unlock_irqrestore(&tport->tp_lock, flags);
      }

      /* more room in the buffer for new writes, wakeup */
      if (tty)
            tty_wakeup(tty);
      wake_up_interruptible(&tport->tp_write_wait);
}


static int ti_set_mcr(struct ti_port *tport, unsigned int mcr)
{
      int status;

      status = ti_write_byte(tport->tp_tdev,
            tport->tp_uart_base_addr + TI_UART_OFFSET_MCR,
            TI_MCR_RTS | TI_MCR_DTR | TI_MCR_LOOP, mcr);

      if (!status)
            tport->tp_shadow_mcr = mcr;

      return status;
}


static int ti_get_lsr(struct ti_port *tport)
{
      int size,status;
      struct ti_device *tdev = tport->tp_tdev;
      struct usb_serial_port *port = tport->tp_port;
      int port_number = port->number - port->serial->minor;
      struct ti_port_status *data;

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

      size = sizeof(struct ti_port_status);
      data = kmalloc(size, GFP_KERNEL);
      if (!data) {
            dev_err(&port->dev, "%s - out of memory\n", __FUNCTION__);
            return -ENOMEM;
      }

      status = ti_command_in_sync(tdev, TI_GET_PORT_STATUS,
            (__u8)(TI_UART1_PORT+port_number), 0, (__u8 *)data, size);
      if (status) {
            dev_err(&port->dev, "%s - get port status command failed, %d\n", __FUNCTION__, status);
            goto free_data;
      }

      dbg("%s - lsr 0x%02X", __FUNCTION__, data->bLSR);

      tport->tp_lsr = data->bLSR;

free_data:
      kfree(data);
      return status;
}


static int ti_get_serial_info(struct ti_port *tport,
      struct serial_struct __user *ret_arg)
{
      struct usb_serial_port *port = tport->tp_port;
      struct serial_struct ret_serial;

      if (!ret_arg)
            return -EFAULT;

      memset(&ret_serial, 0, sizeof(ret_serial));

      ret_serial.type = PORT_16550A;
      ret_serial.line = port->serial->minor;
      ret_serial.port = port->number - port->serial->minor;
      ret_serial.flags = tport->tp_flags;
      ret_serial.xmit_fifo_size = TI_WRITE_BUF_SIZE;
      ret_serial.baud_base = tport->tp_tdev->td_is_3410 ? 921600 : 460800;
      ret_serial.closing_wait = tport->tp_closing_wait;

      if (copy_to_user(ret_arg, &ret_serial, sizeof(*ret_arg)))
            return -EFAULT;

      return 0;
}


static int ti_set_serial_info(struct ti_port *tport,
      struct serial_struct __user *new_arg)
{
      struct usb_serial_port *port = tport->tp_port;
      struct serial_struct new_serial;

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

      tport->tp_flags = new_serial.flags & TI_SET_SERIAL_FLAGS;
      if (port->tty)
            port->tty->low_latency =
                  (tport->tp_flags & ASYNC_LOW_LATENCY) ? 1 : 0;
      tport->tp_closing_wait = new_serial.closing_wait;

      return 0;
}


static void ti_handle_new_msr(struct ti_port *tport, __u8 msr)
{
      struct async_icount *icount;
      struct tty_struct *tty;
      unsigned long flags;

      dbg("%s - msr 0x%02X", __FUNCTION__, msr);

      if (msr & TI_MSR_DELTA_MASK) {
            spin_lock_irqsave(&tport->tp_lock, flags);
            icount = &tport->tp_icount;
            if (msr & TI_MSR_DELTA_CTS)
                  icount->cts++;
            if (msr & TI_MSR_DELTA_DSR)
                  icount->dsr++;
            if (msr & TI_MSR_DELTA_CD)
                  icount->dcd++;
            if (msr & TI_MSR_DELTA_RI)
                  icount->rng++;
            wake_up_interruptible(&tport->tp_msr_wait);
            spin_unlock_irqrestore(&tport->tp_lock, flags);
      }

      tport->tp_msr = msr & TI_MSR_MASK;

      /* handle CTS flow control */
      tty = tport->tp_port->tty;
      if (tty && C_CRTSCTS(tty)) {
            if (msr & TI_MSR_CTS) {
                  tty->hw_stopped = 0;
                  tty_wakeup(tty);
            } else {
                  tty->hw_stopped = 1;
            }
      }
}


static void ti_drain(struct ti_port *tport, unsigned long timeout, int flush)
{
      struct ti_device *tdev = tport->tp_tdev;
      struct usb_serial_port *port = tport->tp_port;
      wait_queue_t wait;
      unsigned long flags;

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

      spin_lock_irqsave(&tport->tp_lock, flags);

      /* wait for data to drain from the buffer */
      tdev->td_urb_error = 0;
      init_waitqueue_entry(&wait, current);
      add_wait_queue(&tport->tp_write_wait, &wait);
      for (;;) {
            set_current_state(TASK_INTERRUPTIBLE);
            if (ti_buf_data_avail(tport->tp_write_buf) == 0
            || timeout == 0 || signal_pending(current)
            || tdev->td_urb_error
            || !usb_get_intfdata(port->serial->interface))  /* disconnect */
                  break;
            spin_unlock_irqrestore(&tport->tp_lock, flags);
            timeout = schedule_timeout(timeout);
            spin_lock_irqsave(&tport->tp_lock, flags);
      }
      set_current_state(TASK_RUNNING);
      remove_wait_queue(&tport->tp_write_wait, &wait);

      /* flush any remaining data in the buffer */
      if (flush)
            ti_buf_clear(tport->tp_write_buf);

      spin_unlock_irqrestore(&tport->tp_lock, flags);

      /* wait for data to drain from the device */
      /* wait for empty tx register, plus 20 ms */
      timeout += jiffies;
      tport->tp_lsr &= ~TI_LSR_TX_EMPTY;
      while ((long)(jiffies - timeout) < 0 && !signal_pending(current)
      && !(tport->tp_lsr&TI_LSR_TX_EMPTY) && !tdev->td_urb_error
      && usb_get_intfdata(port->serial->interface)) {  /* not disconnected */
            if (ti_get_lsr(tport))
                  break;
            msleep_interruptible(20);
      }
}


static void ti_stop_read(struct ti_port *tport, struct tty_struct *tty)
{
      unsigned long flags;

      spin_lock_irqsave(&tport->tp_lock, flags);

      if (tport->tp_read_urb_state == TI_READ_URB_RUNNING)
            tport->tp_read_urb_state = TI_READ_URB_STOPPING;

      spin_unlock_irqrestore(&tport->tp_lock, flags);
}


static int ti_restart_read(struct ti_port *tport, struct tty_struct *tty)
{
      struct urb *urb;
      int status = 0;
      unsigned long flags;

      spin_lock_irqsave(&tport->tp_lock, flags);

      if (tport->tp_read_urb_state == TI_READ_URB_STOPPED) {
            tport->tp_read_urb_state = TI_READ_URB_RUNNING;
            urb = tport->tp_port->read_urb;
            spin_unlock_irqrestore(&tport->tp_lock, flags);
            urb->complete = ti_bulk_in_callback;
            urb->context = tport;
            urb->dev = tport->tp_port->serial->dev;
            status = usb_submit_urb(urb, GFP_KERNEL);
      } else  {
            tport->tp_read_urb_state = TI_READ_URB_RUNNING;
            spin_unlock_irqrestore(&tport->tp_lock, flags);
      }

      return status;
}


static int ti_command_out_sync(struct ti_device *tdev, __u8 command,
      __u16 moduleid, __u16 value, __u8 *data, int size)
{
      int status;

      status = usb_control_msg(tdev->td_serial->dev,
            usb_sndctrlpipe(tdev->td_serial->dev, 0), command,
            (USB_TYPE_VENDOR | USB_RECIP_DEVICE | USB_DIR_OUT),
            value, moduleid, data, size, 1000);

      if (status == size)
            status = 0;

      if (status > 0)
            status = -ECOMM;

      return status;
}


static int ti_command_in_sync(struct ti_device *tdev, __u8 command,
      __u16 moduleid, __u16 value, __u8 *data, int size)
{
      int status;

      status = usb_control_msg(tdev->td_serial->dev,
            usb_rcvctrlpipe(tdev->td_serial->dev, 0), command,
            (USB_TYPE_VENDOR | USB_RECIP_DEVICE | USB_DIR_IN),
            value, moduleid, data, size, 1000);

      if (status == size)
            status = 0;

      if (status > 0)
            status = -ECOMM;

      return status;
}


static int ti_write_byte(struct ti_device *tdev, unsigned long addr,
      __u8 mask, __u8 byte)
{
      int status;
      unsigned int size;
      struct ti_write_data_bytes *data;
      struct device *dev = &tdev->td_serial->dev->dev;

      dbg("%s - addr 0x%08lX, mask 0x%02X, byte 0x%02X", __FUNCTION__, addr, mask, byte);

      size = sizeof(struct ti_write_data_bytes) + 2;
      data = kmalloc(size, GFP_KERNEL);
      if (!data) {
            dev_err(dev, "%s - out of memory\n", __FUNCTION__);
            return -ENOMEM;
      }

      data->bAddrType = TI_RW_DATA_ADDR_XDATA;
      data->bDataType = TI_RW_DATA_BYTE;
      data->bDataCounter = 1;
      data->wBaseAddrHi = cpu_to_be16(addr>>16);
      data->wBaseAddrLo = cpu_to_be16(addr);
      data->bData[0] = mask;
      data->bData[1] = byte;

      status = ti_command_out_sync(tdev, TI_WRITE_DATA, TI_RAM_PORT, 0,
            (__u8 *)data, size);

      if (status < 0)
            dev_err(dev, "%s - failed, %d\n", __FUNCTION__, status);

      kfree(data);

      return status;
}


static int ti_download_firmware(struct ti_device *tdev,
      unsigned char *firmware, unsigned int firmware_size)
{
      int status = 0;
      int buffer_size;
      int pos;
      int len;
      int done;
      __u8 cs = 0;
      __u8 *buffer;
      struct usb_device *dev = tdev->td_serial->dev;
      struct ti_firmware_header *header;
      unsigned int pipe = usb_sndbulkpipe(dev,
            tdev->td_serial->port[0]->bulk_out_endpointAddress);


      buffer_size = TI_FIRMWARE_BUF_SIZE + sizeof(struct ti_firmware_header);
      buffer = kmalloc(buffer_size, GFP_KERNEL);
      if (!buffer) {
            dev_err(&dev->dev, "%s - out of memory\n", __FUNCTION__);
            return -ENOMEM;
      }

      memcpy(buffer, firmware, firmware_size);
      memset(buffer+firmware_size, 0xff, buffer_size-firmware_size);

      for(pos = sizeof(struct ti_firmware_header); pos < buffer_size; pos++)
            cs = (__u8)(cs + buffer[pos]);

      header = (struct ti_firmware_header *)buffer;
      header->wLength = cpu_to_le16((__u16)(buffer_size - sizeof(struct ti_firmware_header)));
      header->bCheckSum = cs;

      dbg("%s - downloading firmware", __FUNCTION__);
      for (pos = 0; pos < buffer_size; pos += done) {
            len = min(buffer_size - pos, TI_DOWNLOAD_MAX_PACKET_SIZE);
            status = usb_bulk_msg(dev, pipe, buffer+pos, len, &done, 1000);
            if (status)
                  break;
      }

      kfree(buffer);

      if (status) {
            dev_err(&dev->dev, "%s - error downloading firmware, %d\n", __FUNCTION__, status);
            return status;
      }

      dbg("%s - download successful", __FUNCTION__);

      return 0;
}


/* Circular Buffer Functions */

/*
 * ti_buf_alloc
 *
 * Allocate a circular buffer and all associated memory.
 */

static struct circ_buf *ti_buf_alloc(void)
{
      struct circ_buf *cb;

      cb = kmalloc(sizeof(struct circ_buf), GFP_KERNEL);
      if (cb == NULL)
            return NULL;

      cb->buf = kmalloc(TI_WRITE_BUF_SIZE, GFP_KERNEL);
      if (cb->buf == NULL) {
            kfree(cb);
            return NULL;
      }

      ti_buf_clear(cb);

      return cb;
}


/*
 * ti_buf_free
 *
 * Free the buffer and all associated memory.
 */

static void ti_buf_free(struct circ_buf *cb)
{
      kfree(cb->buf);
      kfree(cb);
}


/*
 * ti_buf_clear
 *
 * Clear out all data in the circular buffer.
 */

static void ti_buf_clear(struct circ_buf *cb)
{
      cb->head = cb->tail = 0;
}


/*
 * ti_buf_data_avail
 *
 * Return the number of bytes of data available in the circular
 * buffer.
 */

static int ti_buf_data_avail(struct circ_buf *cb)
{
      return CIRC_CNT(cb->head,cb->tail,TI_WRITE_BUF_SIZE);
}


/*
 * ti_buf_space_avail
 *
 * Return the number of bytes of space available in the circular
 * buffer.
 */

static int ti_buf_space_avail(struct circ_buf *cb)
{
      return CIRC_SPACE(cb->head,cb->tail,TI_WRITE_BUF_SIZE);
}


/*
 * ti_buf_put
 *
 * Copy data data from a user buffer and put it into the circular buffer.
 * Restrict to the amount of space available.
 *
 * Return the number of bytes copied.
 */

static int ti_buf_put(struct circ_buf *cb, const char *buf, int count)
{
      int c, ret = 0;

      while (1) {
            c = CIRC_SPACE_TO_END(cb->head, cb->tail, TI_WRITE_BUF_SIZE);
            if (count < c)
                  c = count;
            if (c <= 0)
                  break;
            memcpy(cb->buf + cb->head, buf, c);
            cb->head = (cb->head + c) & (TI_WRITE_BUF_SIZE-1);
            buf += c;
            count -= c;
            ret += c;
      }

      return ret;
}


/*
 * ti_buf_get
 *
 * Get data from the circular buffer and copy to the given buffer.
 * Restrict to the amount of data available.
 *
 * Return the number of bytes copied.
 */

static int ti_buf_get(struct circ_buf *cb, char *buf, int count)
{
      int c, ret = 0;

      while (1) {
            c = CIRC_CNT_TO_END(cb->head, cb->tail, TI_WRITE_BUF_SIZE);
            if (count < c)
                  c = count;
            if (c <= 0)
                  break;
            memcpy(buf, cb->buf + cb->tail, c);
            cb->tail = (cb->tail + c) & (TI_WRITE_BUF_SIZE-1);
            buf += c;
            count -= c;
            ret += c;
      }

      return ret;
}

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