USB: serial: add metro-usb driver to the tree
authorAleksey Babahin <tamerlan311@gmail.com>
Thu, 8 Mar 2012 21:18:43 +0000 (13:18 -0800)
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>
Thu, 8 Mar 2012 21:24:09 +0000 (13:24 -0800)
This driver is for the Metrologic barcode scanner.

Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
drivers/usb/serial/metro-usb.c [new file with mode: 0644]
drivers/usb/serial/metro-usb.h [new file with mode: 0644]

diff --git a/drivers/usb/serial/metro-usb.c b/drivers/usb/serial/metro-usb.c
new file mode 100644 (file)
index 0000000..5b8ed50
--- /dev/null
@@ -0,0 +1,622 @@
+/*
+  Date Created:        9/15/2006
+  File Name:           metro-usb.c
+  Description: metro-usb.c is the drivers main source file. The driver is a USB to Serial converter.
+               The driver takes USB data and sends it to a virtual ttyUSB# serial port.
+               The driver interfaces with the usbserial.ko driver supplied by Linux.
+
+               NOTES:
+               To install the driver:
+               1. Install the usbserial.ko module supplied by Linux with: # insmod usbserial.ko
+               2. Install the metro-usb.ko module with: # insmod metro-usb.ko vender=0x#### product=0x#### debug=1
+                  The vendor, product and debug parameters are optional.
+
+               Some of this code is credited to Linux USB open source files that are distributed with Linux.
+
+  Copyright:   2007 Metrologic Instruments. All rights reserved.
+  Copyright:   2011 Azimut Ltd. <http://azimutrzn.ru/>
+  Requirements: gedit.exe, notepad.exe
+  Revision History:
+
+  Date:                        Developer:                      Revisions:
+  ------------------------------------------------------------------------------
+  1/30/2007            Philip Nicastro         Initial release. (v1.0.0.0)
+  2/27/2007            Philip Nicastro         Changed the metrousb_read_int_callback function to use a loop with the tty_insert_flip_char function to copy each byte to the tty layer. Removed the tty_buffer_request_room and the tty_insert_flip_string function calls. These calls were not supported on Fedora.
+  2/27/2007            Philip Nicastro         Released. (v1.1.0.0)
+  10/07/2011           Aleksey Babahin         Update for new kernel (tested on 2.6.38)
+                                               Add unidirection mode support
+*/
+
+#include <linux/kernel.h>
+#include <linux/init.h>
+#include <linux/tty.h>
+#include <linux/module.h>
+#include <linux/usb.h>
+#include <linux/errno.h>
+#include <linux/slab.h>
+#include <linux/tty_driver.h>
+#include <linux/tty_flip.h>
+#include <linux/moduleparam.h>
+#include <linux/spinlock.h>
+#include <asm/uaccess.h>
+#include <linux/errno.h>
+#include "metro-usb.h"
+#include <linux/usb/serial.h>
+
+/* Version Information */
+#define DRIVER_VERSION "v1.2.0.0"
+#define DRIVER_DESC "Metrologic Instruments Inc. - USB-POS driver"
+
+/* Device table list. */
+static struct usb_device_id id_table [] = {
+       { USB_DEVICE(FOCUS_VENDOR_ID, FOCUS_PRODUCT_ID) },
+       { USB_DEVICE(FOCUS_VENDOR_ID, FOCUS_PRODUCT_ID_UNI) },
+       { }, /* Optional paramenter entry. */
+       { }, /* Terminating entry. */
+};
+MODULE_DEVICE_TABLE(usb, id_table);
+
+/* Input parameter constants. */
+static int debug;
+static __u16 vendor;
+static __u16 product;
+
+/* Function prototypes. */
+static void metrousb_cleanup (struct usb_serial_port *port);
+static void metrousb_close (struct usb_serial_port *port);
+static int  metrousb_open (struct tty_struct *tty, struct usb_serial_port *port);
+static void metrousb_read_int_callback (struct urb *urb);
+static void metrousb_shutdown (struct usb_serial *serial);
+static int metrousb_startup (struct usb_serial *serial);
+static void metrousb_throttle(struct tty_struct *tty);
+static int metrousb_tiocmget(struct tty_struct *tty);
+static int metrousb_tiocmset(struct tty_struct *tty, unsigned int set, unsigned int clear);
+static void metrousb_unthrottle(struct tty_struct *tty);
+
+/* Driver structure. */
+static struct usb_driver metrousb_driver = {
+       .name =         "metro-usb",
+       .probe =        usb_serial_probe,
+       .disconnect =   usb_serial_disconnect,
+       .id_table =     id_table
+};
+
+/* Device structure. */
+static struct usb_serial_driver metrousb_device = {
+       .driver = {
+               .owner =        THIS_MODULE,
+               .name =         "metro-usb",
+       },
+       .description            = "Metrologic USB to serial converter.",
+       .id_table               = id_table,
+       .usb_driver             = &metrousb_driver,
+       .num_ports              = 1,
+       .open                   = metrousb_open,
+       .close                  = metrousb_close,
+       .read_int_callback      = metrousb_read_int_callback,
+       .attach                 = metrousb_startup,
+       .release                = metrousb_shutdown,
+       .throttle               = metrousb_throttle,
+       .unthrottle             = metrousb_unthrottle,
+       .tiocmget               = metrousb_tiocmget,
+       .tiocmset               = metrousb_tiocmset,
+};
+
+/* ----------------------------------------------------------------------------------------------
+  Description:
+       Clean up any urbs and port information.
+
+  Input:
+       struct usb_serial_port *: pointer to a usb_serial_port structure.
+
+  Output:
+       int: Returns true (0) if successful, false otherwise.
+*/
+static void metrousb_cleanup (struct usb_serial_port *port)
+{
+       dbg("METRO-USB - %s - port number=%d", __FUNCTION__, port->number);
+
+       if (port->serial->dev) {
+               /* Shutdown any interrupt in urbs. */
+               if (port->interrupt_in_urb) {
+                       usb_unlink_urb(port->interrupt_in_urb);
+                       usb_kill_urb(port->interrupt_in_urb);
+               }
+
+               // temp
+               // this will be needed for the write urb
+               /* Shutdown any interrupt_out_urbs. */
+               //if (serial->num_bulk_in)
+               //      usb_kill_urb(port->read_urb);
+       }
+}
+
+/* ----------------------------------------------------------------------------------------------
+  Description:
+       Close the open serial port. Cleanup any open serial port information.
+
+  Input:
+       struct usb_serial_port *: pointer to a usb_serial_port structure.
+       struct file *: pointer to a file structure.
+
+  Output:
+       int: Returns true (0) if successful, false otherwise.
+*/
+static void metrousb_close (struct usb_serial_port *port)
+{
+       dbg("METRO-USB - %s - port number=%d", __FUNCTION__, port->number);
+       metrousb_cleanup(port);
+}
+
+/* ----------------------------------------------------------------------------------------------
+  Description:
+       Driver exit.
+
+  Input:
+       None:
+
+  Output:
+       None:
+*/
+static void __exit metrousb_exit(void)
+{
+       dbg("METRO-USB - %s", __FUNCTION__);
+
+       usb_deregister(&metrousb_driver);
+       usb_serial_deregister(&metrousb_device);
+}
+
+/* ----------------------------------------------------------------------------------------------
+  Description:
+       Driver initialization.
+
+  Input:
+       None:
+
+  Output:
+       int: Returns true (0) if successful, false otherwise.
+*/
+static int __init metrousb_init(void)
+{
+       int retval = 0;
+       int i = 0;
+
+       dbg("METRO-USB - %s", __FUNCTION__);
+
+       /* Add the device parameters if entered. */
+       if ((vendor > 0) && (product > 0)) {
+               struct usb_device_id usb_dev_temp[] = { {USB_DEVICE(vendor, product) } };
+
+               /* Find the last entry in id_table */
+               for (i=0; i < ARRAY_SIZE(id_table); i++) {
+                       if (id_table[i].idVendor == 0) {
+                               id_table[i] = usb_dev_temp[0];
+                               break;
+                       }
+               }
+
+               dbg("METRO-USB - %s - support added for unknown device: vendor=0x%x - product=0x%x", __FUNCTION__, vendor, product);
+               printk(KERN_INFO "Metro USB-POS support added for unknown device: vendor=0x%x - product=0x%x", vendor, product);
+       }
+
+       /* Register the devices. */
+       retval = usb_serial_register(&metrousb_device);
+       if (retval)
+               return retval;
+
+       /* Register the driver. */
+       retval = usb_register(&metrousb_driver);
+       if (retval)
+               usb_serial_deregister(&metrousb_device);
+
+       printk(KERN_INFO DRIVER_DESC " : " DRIVER_VERSION);
+
+       return retval;
+}
+
+/* ----------------------------------------------------------------------------------------------
+  Description:
+       Open the drivers serial port.
+
+  Input:
+       struct usb_serial_port *: pointer to a usb_serial_port structure.
+       struct file *: pointer to a file structure.
+
+  Output:
+       int: Returns true (0) if successful, false otherwise.
+*/
+static int metrousb_open (struct tty_struct *tty, struct usb_serial_port *port)
+{
+       struct usb_serial *serial = port->serial;
+       struct metrousb_private *metro_priv = usb_get_serial_port_data(port);
+       unsigned long flags = 0;
+       int result = 0;
+
+       dbg("METRO-USB - %s - port number=%d", __FUNCTION__, port->number);
+
+       /* Make sure the urb is initialized. */
+       if (!port->interrupt_in_urb) {
+               dbg("METRO-USB - %s - interrupt urb not initialized for port number=%d", __FUNCTION__, port->number);
+               return -ENODEV;
+       }
+
+       /* Set the private data information for the port. */
+       spin_lock_irqsave(&metro_priv->lock, flags);
+       metro_priv->control_state = 0;
+       metro_priv->throttled = 0;
+       spin_unlock_irqrestore(&metro_priv->lock, flags);
+
+       /*
+        * Force low_latency on so that our tty_push actually forces the data
+        * through, otherwise it is scheduled, and with high data rates (like
+        * with OHCI) data can get lost.
+        */
+       if (tty) {
+               tty->low_latency = 1;
+       }
+
+       /* Clear the urb pipe. */
+       usb_clear_halt(serial->dev, port->interrupt_in_urb->pipe);
+
+       /* Start reading from the device */
+       usb_fill_int_urb (port->interrupt_in_urb, serial->dev,
+                          usb_rcvintpipe (serial->dev, port->interrupt_in_endpointAddress),
+                          port->interrupt_in_urb->transfer_buffer,
+                          port->interrupt_in_urb->transfer_buffer_length,
+                          metrousb_read_int_callback, port, 1);
+       result = usb_submit_urb(port->interrupt_in_urb, GFP_KERNEL);
+
+       if (result) {
+               dbg("METRO-USB - %s - failed submitting interrupt in urb for port number=%d, error code=%d"
+                       , __FUNCTION__, port->number, result);
+               goto exit;
+       }
+
+       dbg("METRO-USB - %s - port open for port number=%d", __FUNCTION__, port->number);
+exit:
+       return result;
+}
+
+/* ----------------------------------------------------------------------------------------------
+  Description:
+       Read the port from the read interrupt.
+
+  Input:
+       struct urb *: urb structure to get data.
+       struct pt_regs *: pt_regs structure.
+
+  Output:
+       None:
+*/
+static void metrousb_read_int_callback (struct urb *urb)
+{
+       struct usb_serial_port *port = (struct usb_serial_port *)urb->context;
+       struct metrousb_private *metro_priv = usb_get_serial_port_data(port);
+       struct tty_struct *tty;
+       unsigned char *data = urb->transfer_buffer;
+       int throttled = 0;
+       int result = 0;
+       unsigned long flags = 0;
+
+       dbg("METRO-USB - %s - port number=%d", __FUNCTION__, port->number);
+
+       switch (urb->status) {
+               case 0:
+                       /* Success status, read from the port. */
+                       break;
+               case -ECONNRESET:
+               case -ENOENT:
+               case -ESHUTDOWN:
+                       /* urb has been terminated. */
+                       dbg("METRO-USB - %s - urb shutting down, port number=%d, error code=%d",
+                               __FUNCTION__, port->number, result);
+                       return;
+               default:
+                       dbg("METRO-USB - %s - non-zero urb received, port number=%d, error code=%d",
+                               __FUNCTION__, port->number, result);
+                       goto exit;
+       }
+
+
+       /* Set the data read from the usb port into the serial port buffer. */
+       tty = tty_port_tty_get(&port->port);
+       if (!tty) {
+               dbg("%s - bad tty pointer - exiting", __func__);
+               return;
+       }
+
+       if (tty && urb->actual_length) {
+               // Loop through the data copying each byte to the tty layer.
+               tty_insert_flip_string(tty, data, urb->actual_length);
+
+               // Force the data to the tty layer.
+               tty_flip_buffer_push(tty);
+       }
+       tty_kref_put(tty);
+
+       /* Set any port variables. */
+       spin_lock_irqsave(&metro_priv->lock, flags);
+       throttled = metro_priv->throttled;
+       spin_unlock_irqrestore(&metro_priv->lock, flags);
+
+       /* Continue trying to read if set. */
+       if (!throttled) {
+               usb_fill_int_urb (port->interrupt_in_urb, port->serial->dev,
+                                  usb_rcvintpipe (port->serial->dev, port->interrupt_in_endpointAddress),
+                                  port->interrupt_in_urb->transfer_buffer,
+                                  port->interrupt_in_urb->transfer_buffer_length,
+                                  metrousb_read_int_callback, port, 1);
+
+               result = usb_submit_urb(port->interrupt_in_urb, GFP_ATOMIC);
+
+               if (result) {
+                       dbg("METRO-USB - %s - failed submitting interrupt in urb for port number=%d, error code=%d",
+                               __FUNCTION__, port->number, result);
+               }
+       }
+       return;
+
+exit:
+       /* Try to resubmit the urb. */
+       result = usb_submit_urb (urb, GFP_ATOMIC);
+       if (result) {
+               dbg("METRO-USB - %s - failed submitting interrupt in urb for port number=%d, error code=%d",
+                       __FUNCTION__, port->number, result);
+       }
+}
+
+/* ----------------------------------------------------------------------------------------------
+  Description:
+       Set the modem control state for the entered serial port.
+
+  Input:
+       struct usb_serial_port *: pointer to a usb_serial_port structure.
+       unsigned int: control state value to set.
+
+  Output:
+       int: Returns true (0) if successful, false otherwise.
+*/
+static int metrousb_set_modem_ctrl(struct usb_serial *serial, unsigned int control_state)
+{
+       int retval = 0;
+       unsigned char mcr = METROUSB_MCR_NONE;
+
+       dbg("METRO-USB - %s - control state=%d", __FUNCTION__, control_state);
+
+       /* Set the modem control value. */
+       if (control_state & TIOCM_DTR)
+               mcr |= METROUSB_MCR_DTR;
+       if (control_state & TIOCM_RTS)
+               mcr |= METROUSB_MCR_RTS;
+
+       /* Send the command to the usb port. */
+       retval = usb_control_msg(serial->dev, usb_sndctrlpipe(serial->dev, 0),
+                               METROUSB_SET_REQUEST_TYPE, METROUSB_SET_MODEM_CTRL_REQUEST,
+                               control_state, 0, NULL, 0, WDR_TIMEOUT);
+       if (retval < 0)
+               dbg("METRO-USB - %s - set modem ctrl=0x%x failed, error code=%d", __FUNCTION__, mcr, retval);
+
+       return retval;
+}
+
+
+/* ----------------------------------------------------------------------------------------------
+  Description:
+       Shutdown the driver.
+
+  Input:
+       struct usb_serial *: pointer to a usb-serial structure.
+
+  Output:
+       int: Returns true (0) if successful, false otherwise.
+*/
+static void metrousb_shutdown (struct usb_serial *serial)
+{
+       int i = 0;
+
+       dbg("METRO-USB - %s", __FUNCTION__);
+
+       /* Stop reading and writing on all ports. */
+       for (i=0; i < serial->num_ports; ++i) {
+               /* Close any open urbs. */
+               metrousb_cleanup(serial->port[i]);
+
+               /* Free memory. */
+               kfree(usb_get_serial_port_data(serial->port[i]));
+               usb_set_serial_port_data(serial->port[i], NULL);
+
+               dbg("METRO-USB - %s - freed port number=%d", __FUNCTION__, serial->port[i]->number);
+       }
+}
+
+/* ----------------------------------------------------------------------------------------------
+  Description:
+       Startup the driver.
+
+  Input:
+       struct usb_serial *: pointer to a usb-serial structure.
+
+  Output:
+       int: Returns true (0) if successful, false otherwise.
+*/
+static int metrousb_startup(struct usb_serial *serial)
+{
+       struct metrousb_private *metro_priv;
+       struct usb_serial_port *port;
+       int i = 0;
+
+       dbg("METRO-USB - %s", __FUNCTION__);
+
+       /* Loop through the serial ports setting up the private structures.
+        * Currently we only use one port. */
+       for (i = 0; i < serial->num_ports; ++i) {
+               port = serial->port[i];
+
+               /* Declare memory. */
+               metro_priv = (struct metrousb_private *) kmalloc (sizeof(struct metrousb_private), GFP_KERNEL);
+               if (!metro_priv)
+                       return -ENOMEM;
+
+               /* Clear memory. */
+               memset (metro_priv, 0x00, sizeof(struct metrousb_private));
+
+               /* Initialize memory. */
+               spin_lock_init(&metro_priv->lock);
+               usb_set_serial_port_data(port, metro_priv);
+
+               dbg("METRO-USB - %s - port number=%d.", __FUNCTION__, port->number);
+       }
+
+       return 0;
+}
+
+/* ----------------------------------------------------------------------------------------------
+  Description:
+       Set the serial port throttle to stop reading from the port.
+
+  Input:
+       struct usb_serial_port *: pointer to a usb_serial_port structure.
+
+  Output:
+       None:
+*/
+static void metrousb_throttle (struct tty_struct *tty)
+{
+       struct usb_serial_port *port = tty->driver_data;
+       struct metrousb_private *metro_priv = usb_get_serial_port_data(port);
+       unsigned long flags = 0;
+
+       dbg("METRO-USB - %s - port number=%d", __FUNCTION__, port->number);
+
+       /* Set the private information for the port to stop reading data. */
+       spin_lock_irqsave(&metro_priv->lock, flags);
+       metro_priv->throttled = 1;
+       spin_unlock_irqrestore(&metro_priv->lock, flags);
+}
+
+/* ----------------------------------------------------------------------------------------------
+  Description:
+       Get the serial port control line states.
+
+  Input:
+       struct usb_serial_port *: pointer to a usb_serial_port structure.
+       struct file *: pointer to a file structure.
+
+  Output:
+       int: Returns the state of the control lines.
+*/
+static int metrousb_tiocmget (struct tty_struct *tty)
+{
+       unsigned long control_state = 0;
+       struct usb_serial_port *port = tty->driver_data;
+       struct metrousb_private *metro_priv = usb_get_serial_port_data(port);
+       unsigned long flags = 0;
+
+       dbg("METRO-USB - %s - port number=%d", __FUNCTION__, port->number);
+
+       spin_lock_irqsave(&metro_priv->lock, flags);
+       control_state = metro_priv->control_state;
+       spin_unlock_irqrestore(&metro_priv->lock, flags);
+
+       return control_state;
+}
+
+/* ----------------------------------------------------------------------------------------------
+  Description:
+       Set the serial port control line states.
+
+  Input:
+       struct usb_serial_port *: pointer to a usb_serial_port structure.
+       struct file *: pointer to a file structure.
+       unsigned int: line state to set.
+       unsigned int: line state to clear.
+
+  Output:
+       int: Returns the state of the control lines.
+*/
+static int metrousb_tiocmset (struct tty_struct *tty,
+                              unsigned int set, unsigned int clear)
+{
+       struct usb_serial_port *port = tty->driver_data;
+       struct usb_serial *serial = port->serial;
+       struct metrousb_private *metro_priv = usb_get_serial_port_data(port);
+       unsigned long flags = 0;
+       unsigned long control_state = 0;
+
+       dbg("METRO-USB - %s - port number=%d, set=%d, clear=%d", __FUNCTION__, port->number, set, clear);
+
+       spin_lock_irqsave(&metro_priv->lock, flags);
+       control_state = metro_priv->control_state;
+
+       // Set the RTS and DTR values.
+       if (set & TIOCM_RTS)
+               control_state |= TIOCM_RTS;
+       if (set & TIOCM_DTR)
+               control_state |= TIOCM_DTR;
+       if (clear & TIOCM_RTS)
+               control_state &= ~TIOCM_RTS;
+       if (clear & TIOCM_DTR)
+               control_state &= ~TIOCM_DTR;
+
+       metro_priv->control_state = control_state;
+       spin_unlock_irqrestore(&metro_priv->lock, flags);
+       return metrousb_set_modem_ctrl(serial, control_state);
+}
+
+/* ----------------------------------------------------------------------------------------------
+  Description:
+       Set the serial port unthrottle to resume reading from the port.
+
+  Input:
+       struct usb_serial_port *: pointer to a usb_serial_port structure.
+
+  Output:
+       None:
+*/
+static void metrousb_unthrottle (struct tty_struct *tty)
+{
+       struct usb_serial_port *port = tty->driver_data;
+       struct metrousb_private *metro_priv = usb_get_serial_port_data(port);
+       unsigned long flags = 0;
+       int result = 0;
+
+       dbg("METRO-USB - %s - port number=%d", __FUNCTION__, port->number);
+
+       /* Set the private information for the port to resume reading data. */
+       spin_lock_irqsave(&metro_priv->lock, flags);
+       metro_priv->throttled = 0;
+       spin_unlock_irqrestore(&metro_priv->lock, flags);
+
+       /* Submit the urb to read from the port. */
+       port->interrupt_in_urb->dev = port->serial->dev;
+       result = usb_submit_urb(port->interrupt_in_urb, GFP_ATOMIC);
+       if (result) {
+               dbg("METRO-USB - %s - failed submitting interrupt in urb for port number=%d, error code=%d",
+                       __FUNCTION__, port->number, result);
+       }
+}
+
+/* Standard module function. */
+module_init(metrousb_init);
+module_exit(metrousb_exit);
+MODULE_LICENSE("GPL");
+MODULE_AUTHOR( "Philip Nicastro" );
+MODULE_AUTHOR( "Aleksey Babahin <tamerlan311@gmail.com>" );
+MODULE_DESCRIPTION( DRIVER_DESC );
+
+/* Module input parameters */
+module_param(debug, bool, S_IRUGO | S_IWUSR);
+MODULE_PARM_DESC(debug, "Print debug info (bool 1=on, 0=off)");
+
+module_param(vendor, ushort, 0);
+MODULE_PARM_DESC(vendor, "User specified vendor ID (ushort)");
+
+module_param(product, ushort, 0);
+MODULE_PARM_DESC(product, "User specified product ID (ushort)");
+
+
+
+
diff --git a/drivers/usb/serial/metro-usb.h b/drivers/usb/serial/metro-usb.h
new file mode 100644 (file)
index 0000000..0367b6c
--- /dev/null
@@ -0,0 +1,52 @@
+/*
+  Date Created:        1/12/2007
+  File Name:           metro-usb.h
+  Description: metro-usb.h is the drivers header file. The driver is a USB to Serial converter.
+               The driver takes USB data and sends it to a virtual ttyUSB# serial port.
+               The driver interfaces with the usbserial.ko driver supplied by Linux.
+
+               NOTES:
+               To install the driver:
+               1. Install the usbserial.ko module supplied by Linux with: # insmod usbserial.ko
+               2. Install the metro-usb.ko module with: # insmod metro-usb.ko vender=0x#### product=0x#### debug=1
+                  The vendor, product and debug parameters are optional.
+
+  Copyright:   2007 Metrologic Instruments. All rights reserved.
+  Copyright:   2011 Azimut Ltd. <http://azimutrzn.ru/>
+  Requirements: Notepad.exe
+
+  Revision History:
+
+  Date:                        Developer:                      Revisions:
+  ------------------------------------------------------------------------------
+  1/12/2007            Philip Nicastro         Initial release. (v1.0.0.0)
+  10/07/2011           Aleksey Babahin         Update for new kernel (tested on 2.6.38)
+                                               Add unidirection mode support
+
+
+*/
+
+#ifndef __LINUX_USB_SERIAL_METRO
+#define __LINUX_USB_SERIAL_METRO
+
+/* Product information. */
+#define FOCUS_VENDOR_ID                0x0C2E
+#define FOCUS_PRODUCT_ID       0x0720
+#define FOCUS_PRODUCT_ID_UNI   0x0710
+
+#define METROUSB_SET_REQUEST_TYPE      0x40
+#define METROUSB_SET_MODEM_CTRL_REQUEST        10
+#define METROUSB_SET_BREAK_REQUEST     0x40
+#define METROUSB_MCR_NONE               0x8     /* Deactivate DTR and RTS. */
+#define METROUSB_MCR_RTS                0xa     /* Activate RTS. */
+#define METROUSB_MCR_DTR                0x9     /* Activate DTR. */
+#define WDR_TIMEOUT                    5000    /* default urb timeout. */
+
+/* Private data structure. */
+struct metrousb_private {
+       spinlock_t lock;
+       int throttled;
+       unsigned long control_state;
+};
+
+#endif