Linux-2.6.12-rc2v2.6.12-rc2

Initial git repository build. I'm not bothering with the full history,
even though we have it. We can create a separate "historical" git
archive of that later if we want to, and in the meantime it's about
3.2GB when imported into git - space that would just make the early
git days unnecessarily complicated, when we don't have a lot of good
infrastructure for it.

Let it rip!

1 files changed, 1842 insertions, 0 deletions

diff --git a/drivers/usb/serial/ti_usb_3410_5052.c b/drivers/usb/serial/ti_usb_3410_5052.c
new file mode 100644
index 00000000000..98054876cca
--- /dev/null
+++ b/drivers/usb/serial/ti_usb_3410_5052.c
@@ -0,0 +1,1842 @@
+/* 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/config.h>
+#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 "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 = {
+	.owner			= THIS_MODULE,
+	.name			= "ti_usb_3410_5052",
+	.probe			= usb_serial_probe,
+	.disconnect		= usb_serial_disconnect,
+	.id_table		= ti_id_table_combined,
+};
+
+static struct usb_serial_device_type ti_1port_device = {
+	.owner			= THIS_MODULE,
+	.name			= "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_device_type ti_2port_device = {
+	.owner			= THIS_MODULE,
+	.name			= "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 */
+
+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 = sizeof(ti_id_table_3410)/sizeof(struct usb_device_id)
+		- 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 = sizeof(ti_id_table_5052)/sizeof(struct usb_device_id)
+		- 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 = kmalloc(sizeof(struct ti_device), GFP_KERNEL);
+	if (tdev == NULL) {
+		dev_err(&dev->dev, "%s - out of memory\n", __FUNCTION__);
+		return -ENOMEM;
+	}
+	memset(tdev, 0, sizeof(struct ti_device));
+	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);
+		}
+	}
+
+	if (tdev)
+		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 {
+		if (tty->flip.count >= TTY_FLIPBUF_SIZE) {
+			tty_flip_buffer_push(tty);
+			if (tty->flip.count >= TTY_FLIPBUF_SIZE) {
+				dev_err(dev, "%s - dropping data, %d bytes lost\n", __FUNCTION__, length);
+				return;
+			}
+		}
+		cnt = min(length, TTY_FLIPBUF_SIZE - tty->flip.count);
+		memcpy(tty->flip.char_buf_ptr, data, cnt);
+		memset(tty->flip.flag_buf_ptr, 0, cnt);
+		tty->flip.char_buf_ptr += cnt;
+		tty->flip.flag_buf_ptr += cnt;
+		tty->flip.count += cnt;
+		data += cnt;
+		length -= cnt;
+	} while (length > 0);
+
+	tty_flip_buffer_push(tty);
+}
+
+
+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;
+}