Not receving any data on ttyUSB0

Deepthi,

what command are you using for reading data from USB serial device ? Do you see any error message when you execute the command ?If so then please provide the error log.

Regards,

Ajay

I am opening the device as

usb_read_fd=open(/dev/ttyUSB0,O_RDWR | O_NOCTTY|O_NDELAY);

Hi Ajay,

    Thanks for your replay

I even tried with out O_NDELAY to make it blocking.

Termios is set as

   tio.c_cflag = BAUDRATE | CS8 | CLOCAL | CREAD;/**115200,8bits,1 stopbit,1start,no parity,recive enable */
        tio.c_iflag = IGNPAR;
        tio.c_oflag = 0;
        tio.c_lflag = 0;
        tio.c_cc[VTIME] = 0;
        tio.c_cc[VMIN] = 0;
        tcflush(usb_read_fd, TCIFLUSH);
        if(tcsetattr(usb_read_fdTCSANOW,&tio)<0)
        {
                printf("Failed to set Termios\n");
                return -1;
        }
I even tried commenting out VTIME and VMIN.

Iam reading the device as

ret=read(usb_read_fd,buff,20);

read is always returning 0.

even in minicom Iam not able to see any data.

Please help me out to resolve this issue.

Thanks and Regards

Deepthi Kiran

 

 

 

Hi Ajay,

 

We are using USB based device . vendor  has  given windows driver which I had installed on my windows machine. If I connect this device to windows machine's USB port. Device is getting detected and creating virtual COM port. If I open the that com port using hyper terminal Iam able to see the continous  data.

For our actual need this has to be connected to DM6446 based custom board.I have built a driver with ti_usb_3410_5052 support in linux-2.6.18_pro500 kernel.

This is built as module and if I do insmod ti_usb_3410_5052.ko vendor=0x451 product 0x100.If  I connect USB device to our custom board it  is getting attached to ttyUSB0 .

Now if I try to read any data from it. Read is timing out.

Thanks and Regards

Deepthi

 

Ajay,

I tried   USB device connecting on to the board and run minicom on the board by selecting /dev/ttyUSB 0. but Iam not getting any data on the board's minicom.

This I did by loging on to the board using ssh

 Regards

Deepthi

Deepthi,

>>If I open the that com port using hyper terminal Iam able to see the continous  data.

What kind of data? Do you perform something on device?I didn't understand the device functionality, is it usb serial device  ? or something else?

Please also provide the details of software used  (Kernel version/PSP release version) on DM644x device ?

 

Regards,
Ajay

Ajay,

 The device is HD fono scthescope. Yeas it is USB to serial device. It will keep continoulsy sending data on opeing the created virtual port.

Kernel version is linux version ix 2.6.18 and PSP is 500.

Regards

Deepthi

 

 

Deepthi,

Thanks for providing the details.

The driver for you device need to submit read request to lower level usb driver so that it can issue the read request on usb bus. I am not sure if read() call from you application is

actually sending any read request down to driver. Can you see the driver file and check if ".read" is implemented and it submits request to usb stack.

Additionally provide the out put of [(a) $ cat /proc/driver/musb_hdrc and (b) $ cat /proc/interrupts ]after connecting the device and starting your application for read.

Regards,

Ajay

Ajay,

  Iam using the TI- provided driver only ti_usb_3410_5052.c file.There is no file created cat /proc/driver/musb_hdrc and (b) $ cat /proc/interrupts.

The statement Iam getting after connecting the device is

"usbserial_generic 1-1.3:1.0: generic converter detected
usb 1-1.3: generic converter now attached to ttyUSB0
usbcore: registered new driver usbserial_generic"

s there any other method to read the device if there is no read call implemented it it?

Regards

Deepthi

 

Ajay

Following is the file which is used for hd fono.

Inventra support is already added.

Below is my kernel configuration

   <M> USB Serial Converter support                                                            
                   [*]   USB Generic Serial Driver  

<M>   USB TI 3410/5052 Serial Driver

Do I need to add any additional thing to it. One more thing I have done is Iam buiiding  this module seperatly outside the kernel

by addding "ti_usb_3410_5052-objs           := usb-serial.o  generic.o ti_usb_3410_5052.o  bus.o"

If I use the ti_usb_3410_5052.ko which is created in the kernel source Iam getting undefind refernce to usb_serial register and all. So I need to load ti_usb_3410_5052.ko and then load  ti_usb_3410_5052.ko. but I have to use one more usb to serial device if I insert that then Iam getting as usb-serialis owened by ti_usb_3410_5052.

Is there any thing Iam missing here?

For other device also I need to compile the module sepratly to make it work.

If I build thes modules along with kernel, driver is getting loaded and device is getting detected but not getting attached to the ttyUSBx port. this might be because of worg vendor ID and product ID. How to give my requird vendor ID and product id in the driver?

The following is the driver code which Iam using for HD fono. Please check this and help me out to resolve the issue

/* 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 termios *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, struct pt_regs *regs);
static void ti_bulk_in_callback(struct urb *urb, struct pt_regs *regs);
static void ti_bulk_out_callback(struct urb *urb, struct pt_regs *regs);

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 int vendor_3410_count;
static ushort product_3410[TI_EXTRA_VID_PID_COUNT];
static int product_3410_count;
static ushort vendor_5052[TI_EXTRA_VID_PID_COUNT];
static int vendor_5052_count;
static ushort product_5052[TI_EXTRA_VID_PID_COUNT];
static 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) },
};

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_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",
 .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",
 .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 */
static __u16 vendor  = 0x4051;
static __u16 product = 0x0100;

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 = kmalloc(sizeof(struct ti_port), GFP_KERNEL);
  if (tport == NULL) {
   dev_err(&dev->dev, "%s - out of memory\n", __FUNCTION__);
   status = -ENOMEM;
   goto free_tports;
  }
  memset(tport, 0, sizeof(struct ti_port));
  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 termios *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 pt_regs *regs)
{
 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;
 __u8 msr;

 dbg("%s", __FUNCTION__);

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

static void ti_bulk_in_callback(struct urb *urb, struct pt_regs *regs)
{
 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 = 0;

 dbg("%s", __FUNCTION__);

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

 if (urb->status == -EPIPE)
  goto exit;

 if (urb->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;
  status = 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 (status)
  dev_err(dev, "%s - resubmit read urb failed, %d\n", __FUNCTION__, status);
}

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

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

 tport->tp_write_urb_in_use = 0;

 switch (urb->status) {
 case 0:
  break;
 case -ECONNRESET:
 case -ENOENT:
 case -ESHUTDOWN:
  dbg("%s - urb shutting down, %d", __FUNCTION__, urb->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__, urb->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) {
  urb = tport->tp_port->read_urb;
  urb->complete = ti_bulk_in_callback;
  urb->context = tport;
  urb->dev = tport->tp_port->serial->dev;
  status = usb_submit_urb(urb, GFP_KERNEL);
 }
 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 = (struct circ_buf *)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;
}

Deepthi,

I don;t see .read function so read() api may not be the correct one to use. I think you need to contact the person who has provided this driver to you. I have not used this device and dri

 .----------------------------------------------------
 .attach   = ti_startup,
 .shutdown  = ti_shutdown,
 .open   = ti_open,
 .close   = ti_close,
 .write   = ti_write,
 .write_room  = ti_write_room,
[...]
 .read_int_callback = ti_interrupt_callback,
 .read_bulk_callback = ti_bulk_in_callback,
 .write_bulk_callback = ti_bulk_out_callback,ver before.

-------------------------------------------------------

Regards,
Ajay

Ajay,

 This code is the part of kernel and is provided by TI only.

read call we can do because, I had already used read system call for ttyUSB0 for other USB to serial driver for pro4.In that also .read is not there.

Atleast can u help me out in resolving the compliation issue that I have mentioned in the abov mail.

Can you give me any contact person in TI to whom I can sek help in resovling this issue?

Regards

Deepthi

The driver might be missing some .h file and thus showing "undefined reference". You can find the related .h and add in .c file to fix it. The Vendor ID and product ID also can be mentioned inside the driver file. I think it should be taken by macros defined as TI_VENDOR_ID, TI_3410_PRODUCT_ID.

Regards,
Ajay