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Diffstat (limited to 'drivers/usb/serial/belkin_sa.c')
-rw-r--r--drivers/usb/serial/belkin_sa.c614
1 files changed, 614 insertions, 0 deletions
diff --git a/drivers/usb/serial/belkin_sa.c b/drivers/usb/serial/belkin_sa.c
new file mode 100644
index 000000000000..86994d117c44
--- /dev/null
+++ b/drivers/usb/serial/belkin_sa.c
@@ -0,0 +1,614 @@
+/*
+ * Belkin USB Serial Adapter Driver
+ *
+ * Copyright (C) 2000 William Greathouse (wgreathouse@smva.com)
+ * Copyright (C) 2000-2001 Greg Kroah-Hartman (greg@kroah.com)
+ *
+ * This program is largely derived from work by the linux-usb group
+ * and associated source files. Please see the usb/serial files for
+ * individual credits and copyrights.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * See Documentation/usb/usb-serial.txt for more information on using this driver
+ *
+ * TODO:
+ * -- Add true modem contol line query capability. Currently we track the
+ * states reported by the interrupt and the states we request.
+ * -- Add error reporting back to application for UART error conditions.
+ * Just point me at how to implement this and I'll do it. I've put the
+ * framework in, but haven't analyzed the "tty_flip" interface yet.
+ * -- Add support for flush commands
+ * -- Add everything that is missing :)
+ *
+ * 27-Nov-2001 gkh
+ * compressed all the differnent device entries into 1.
+ *
+ * 30-May-2001 gkh
+ * switched from using spinlock to a semaphore, which fixes lots of problems.
+ *
+ * 08-Apr-2001 gb
+ * - Identify version on module load.
+ *
+ * 12-Mar-2001 gkh
+ * - Added support for the GoHubs GO-COM232 device which is the same as the
+ * Peracom device.
+ *
+ * 06-Nov-2000 gkh
+ * - Added support for the old Belkin and Peracom devices.
+ * - Made the port able to be opened multiple times.
+ * - Added some defaults incase the line settings are things these devices
+ * can't support.
+ *
+ * 18-Oct-2000 William Greathouse
+ * Released into the wild (linux-usb-devel)
+ *
+ * 17-Oct-2000 William Greathouse
+ * Add code to recognize firmware version and set hardware flow control
+ * appropriately. Belkin states that firmware prior to 3.05 does not
+ * operate correctly in hardware handshake mode. I have verified this
+ * on firmware 2.05 -- for both RTS and DTR input flow control, the control
+ * line is not reset. The test performed by the Belkin Win* driver is
+ * to enable hardware flow control for firmware 2.06 or greater and
+ * for 1.00 or prior. I am only enabling for 2.06 or greater.
+ *
+ * 12-Oct-2000 William Greathouse
+ * First cut at supporting Belkin USB Serial Adapter F5U103
+ * I did not have a copy of the original work to support this
+ * adapter, so pardon any stupid mistakes. All of the information
+ * I am using to write this driver was acquired by using a modified
+ * UsbSnoop on Windows2000 and from examining the other USB drivers.
+ */
+
+#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 <asm/uaccess.h>
+#include <linux/usb.h>
+#include "usb-serial.h"
+#include "belkin_sa.h"
+
+static int debug;
+
+/*
+ * Version Information
+ */
+#define DRIVER_VERSION "v1.2"
+#define DRIVER_AUTHOR "William Greathouse <wgreathouse@smva.com>"
+#define DRIVER_DESC "USB Belkin Serial converter driver"
+
+/* function prototypes for a Belkin USB Serial Adapter F5U103 */
+static int belkin_sa_startup (struct usb_serial *serial);
+static void belkin_sa_shutdown (struct usb_serial *serial);
+static int belkin_sa_open (struct usb_serial_port *port, struct file *filp);
+static void belkin_sa_close (struct usb_serial_port *port, struct file *filp);
+static void belkin_sa_read_int_callback (struct urb *urb, struct pt_regs *regs);
+static void belkin_sa_set_termios (struct usb_serial_port *port, struct termios * old);
+static int belkin_sa_ioctl (struct usb_serial_port *port, struct file * file, unsigned int cmd, unsigned long arg);
+static void belkin_sa_break_ctl (struct usb_serial_port *port, int break_state );
+static int belkin_sa_tiocmget (struct usb_serial_port *port, struct file *file);
+static int belkin_sa_tiocmset (struct usb_serial_port *port, struct file *file, unsigned int set, unsigned int clear);
+
+
+static struct usb_device_id id_table_combined [] = {
+ { USB_DEVICE(BELKIN_SA_VID, BELKIN_SA_PID) },
+ { USB_DEVICE(BELKIN_OLD_VID, BELKIN_OLD_PID) },
+ { USB_DEVICE(PERACOM_VID, PERACOM_PID) },
+ { USB_DEVICE(GOHUBS_VID, GOHUBS_PID) },
+ { USB_DEVICE(GOHUBS_VID, HANDYLINK_PID) },
+ { USB_DEVICE(BELKIN_DOCKSTATION_VID, BELKIN_DOCKSTATION_PID) },
+ { } /* Terminating entry */
+};
+
+MODULE_DEVICE_TABLE (usb, id_table_combined);
+
+static struct usb_driver belkin_driver = {
+ .owner = THIS_MODULE,
+ .name = "belkin",
+ .probe = usb_serial_probe,
+ .disconnect = usb_serial_disconnect,
+ .id_table = id_table_combined,
+};
+
+/* All of the device info needed for the serial converters */
+static struct usb_serial_device_type belkin_device = {
+ .owner = THIS_MODULE,
+ .name = "Belkin / Peracom / GoHubs USB Serial Adapter",
+ .short_name = "belkin",
+ .id_table = id_table_combined,
+ .num_interrupt_in = 1,
+ .num_bulk_in = 1,
+ .num_bulk_out = 1,
+ .num_ports = 1,
+ .open = belkin_sa_open,
+ .close = belkin_sa_close,
+ .read_int_callback = belkin_sa_read_int_callback, /* How we get the status info */
+ .ioctl = belkin_sa_ioctl,
+ .set_termios = belkin_sa_set_termios,
+ .break_ctl = belkin_sa_break_ctl,
+ .tiocmget = belkin_sa_tiocmget,
+ .tiocmset = belkin_sa_tiocmset,
+ .attach = belkin_sa_startup,
+ .shutdown = belkin_sa_shutdown,
+};
+
+
+struct belkin_sa_private {
+ spinlock_t lock;
+ unsigned long control_state;
+ unsigned char last_lsr;
+ unsigned char last_msr;
+ int bad_flow_control;
+};
+
+
+/*
+ * ***************************************************************************
+ * Belkin USB Serial Adapter F5U103 specific driver functions
+ * ***************************************************************************
+ */
+
+#define WDR_TIMEOUT 5000 /* default urb timeout */
+
+/* assumes that struct usb_serial *serial is available */
+#define BSA_USB_CMD(c,v) usb_control_msg(serial->dev, usb_sndctrlpipe(serial->dev, 0), \
+ (c), BELKIN_SA_SET_REQUEST_TYPE, \
+ (v), 0, NULL, 0, WDR_TIMEOUT)
+
+/* do some startup allocations not currently performed by usb_serial_probe() */
+static int belkin_sa_startup (struct usb_serial *serial)
+{
+ struct usb_device *dev = serial->dev;
+ struct belkin_sa_private *priv;
+
+ /* allocate the private data structure */
+ priv = kmalloc(sizeof(struct belkin_sa_private), GFP_KERNEL);
+ if (!priv)
+ return (-1); /* error */
+ /* set initial values for control structures */
+ spin_lock_init(&priv->lock);
+ priv->control_state = 0;
+ priv->last_lsr = 0;
+ priv->last_msr = 0;
+ /* see comments at top of file */
+ priv->bad_flow_control = (le16_to_cpu(dev->descriptor.bcdDevice) <= 0x0206) ? 1 : 0;
+ info("bcdDevice: %04x, bfc: %d", le16_to_cpu(dev->descriptor.bcdDevice), priv->bad_flow_control);
+
+ init_waitqueue_head(&serial->port[0]->write_wait);
+ usb_set_serial_port_data(serial->port[0], priv);
+
+ return (0);
+}
+
+
+static void belkin_sa_shutdown (struct usb_serial *serial)
+{
+ struct belkin_sa_private *priv;
+ int i;
+
+ dbg ("%s", __FUNCTION__);
+
+ /* stop reads and writes on all ports */
+ for (i=0; i < serial->num_ports; ++i) {
+ /* My special items, the standard routines free my urbs */
+ priv = usb_get_serial_port_data(serial->port[i]);
+ if (priv)
+ kfree(priv);
+ }
+}
+
+
+static int belkin_sa_open (struct usb_serial_port *port, struct file *filp)
+{
+ int retval = 0;
+
+ dbg("%s port %d", __FUNCTION__, port->number);
+
+ /*Start reading from the device*/
+ /* TODO: Look at possibility of submitting multiple URBs to device to
+ * enhance buffering. Win trace shows 16 initial read URBs.
+ */
+ port->read_urb->dev = port->serial->dev;
+ retval = usb_submit_urb(port->read_urb, GFP_KERNEL);
+ if (retval) {
+ err("usb_submit_urb(read bulk) failed");
+ goto exit;
+ }
+
+ port->interrupt_in_urb->dev = port->serial->dev;
+ retval = usb_submit_urb(port->interrupt_in_urb, GFP_KERNEL);
+ if (retval) {
+ usb_kill_urb(port->read_urb);
+ err(" usb_submit_urb(read int) failed");
+ }
+
+exit:
+ return retval;
+} /* belkin_sa_open */
+
+
+static void belkin_sa_close (struct usb_serial_port *port, struct file *filp)
+{
+ dbg("%s port %d", __FUNCTION__, port->number);
+
+ /* shutdown our bulk reads and writes */
+ usb_kill_urb(port->write_urb);
+ usb_kill_urb(port->read_urb);
+ usb_kill_urb(port->interrupt_in_urb);
+} /* belkin_sa_close */
+
+
+static void belkin_sa_read_int_callback (struct urb *urb, struct pt_regs *regs)
+{
+ struct usb_serial_port *port = (struct usb_serial_port *)urb->context;
+ struct belkin_sa_private *priv;
+ unsigned char *data = urb->transfer_buffer;
+ int retval;
+ unsigned long flags;
+
+ switch (urb->status) {
+ case 0:
+ /* success */
+ break;
+ case -ECONNRESET:
+ case -ENOENT:
+ case -ESHUTDOWN:
+ /* this urb is terminated, clean up */
+ dbg("%s - urb shutting down with status: %d", __FUNCTION__, urb->status);
+ return;
+ default:
+ dbg("%s - nonzero urb status received: %d", __FUNCTION__, urb->status);
+ goto exit;
+ }
+
+ usb_serial_debug_data(debug, &port->dev, __FUNCTION__, urb->actual_length, data);
+
+ /* Handle known interrupt data */
+ /* ignore data[0] and data[1] */
+
+ priv = usb_get_serial_port_data(port);
+ spin_lock_irqsave(&priv->lock, flags);
+ priv->last_msr = data[BELKIN_SA_MSR_INDEX];
+
+ /* Record Control Line states */
+ if (priv->last_msr & BELKIN_SA_MSR_DSR)
+ priv->control_state |= TIOCM_DSR;
+ else
+ priv->control_state &= ~TIOCM_DSR;
+
+ if (priv->last_msr & BELKIN_SA_MSR_CTS)
+ priv->control_state |= TIOCM_CTS;
+ else
+ priv->control_state &= ~TIOCM_CTS;
+
+ if (priv->last_msr & BELKIN_SA_MSR_RI)
+ priv->control_state |= TIOCM_RI;
+ else
+ priv->control_state &= ~TIOCM_RI;
+
+ if (priv->last_msr & BELKIN_SA_MSR_CD)
+ priv->control_state |= TIOCM_CD;
+ else
+ priv->control_state &= ~TIOCM_CD;
+
+ /* Now to report any errors */
+ priv->last_lsr = data[BELKIN_SA_LSR_INDEX];
+#if 0
+ /*
+ * fill in the flip buffer here, but I do not know the relation
+ * to the current/next receive buffer or characters. I need
+ * to look in to this before committing any code.
+ */
+ if (priv->last_lsr & BELKIN_SA_LSR_ERR) {
+ tty = port->tty;
+ /* Overrun Error */
+ if (priv->last_lsr & BELKIN_SA_LSR_OE) {
+ }
+ /* Parity Error */
+ if (priv->last_lsr & BELKIN_SA_LSR_PE) {
+ }
+ /* Framing Error */
+ if (priv->last_lsr & BELKIN_SA_LSR_FE) {
+ }
+ /* Break Indicator */
+ if (priv->last_lsr & BELKIN_SA_LSR_BI) {
+ }
+ }
+#endif
+ spin_unlock_irqrestore(&priv->lock, flags);
+exit:
+ retval = usb_submit_urb (urb, GFP_ATOMIC);
+ if (retval)
+ err ("%s - usb_submit_urb failed with result %d",
+ __FUNCTION__, retval);
+}
+
+static void belkin_sa_set_termios (struct usb_serial_port *port, struct termios *old_termios)
+{
+ struct usb_serial *serial = port->serial;
+ struct belkin_sa_private *priv = usb_get_serial_port_data(port);
+ unsigned int iflag;
+ unsigned int cflag;
+ unsigned int old_iflag = 0;
+ unsigned int old_cflag = 0;
+ __u16 urb_value = 0; /* Will hold the new flags */
+ unsigned long flags;
+ unsigned long control_state;
+ int bad_flow_control;
+
+ if ((!port->tty) || (!port->tty->termios)) {
+ dbg ("%s - no tty or termios structure", __FUNCTION__);
+ return;
+ }
+
+ iflag = port->tty->termios->c_iflag;
+ cflag = port->tty->termios->c_cflag;
+
+ /* get a local copy of the current port settings */
+ spin_lock_irqsave(&priv->lock, flags);
+ control_state = priv->control_state;
+ bad_flow_control = priv->bad_flow_control;
+ spin_unlock_irqrestore(&priv->lock, flags);
+
+ /* check that they really want us to change something */
+ if (old_termios) {
+ if ((cflag == old_termios->c_cflag) &&
+ (RELEVANT_IFLAG(port->tty->termios->c_iflag) == RELEVANT_IFLAG(old_termios->c_iflag))) {
+ dbg("%s - nothing to change...", __FUNCTION__);
+ return;
+ }
+ old_iflag = old_termios->c_iflag;
+ old_cflag = old_termios->c_cflag;
+ }
+
+ /* Set the baud rate */
+ if( (cflag&CBAUD) != (old_cflag&CBAUD) ) {
+ /* reassert DTR and (maybe) RTS on transition from B0 */
+ if( (old_cflag&CBAUD) == B0 ) {
+ control_state |= (TIOCM_DTR|TIOCM_RTS);
+ if (BSA_USB_CMD(BELKIN_SA_SET_DTR_REQUEST, 1) < 0)
+ err("Set DTR error");
+ /* don't set RTS if using hardware flow control */
+ if (!(old_cflag&CRTSCTS) )
+ if (BSA_USB_CMD(BELKIN_SA_SET_RTS_REQUEST, 1) < 0)
+ err("Set RTS error");
+ }
+
+ switch(cflag & CBAUD) {
+ case B0: /* handled below */ break;
+ case B300: urb_value = BELKIN_SA_BAUD(300); break;
+ case B600: urb_value = BELKIN_SA_BAUD(600); break;
+ case B1200: urb_value = BELKIN_SA_BAUD(1200); break;
+ case B2400: urb_value = BELKIN_SA_BAUD(2400); break;
+ case B4800: urb_value = BELKIN_SA_BAUD(4800); break;
+ case B9600: urb_value = BELKIN_SA_BAUD(9600); break;
+ case B19200: urb_value = BELKIN_SA_BAUD(19200); break;
+ case B38400: urb_value = BELKIN_SA_BAUD(38400); break;
+ case B57600: urb_value = BELKIN_SA_BAUD(57600); break;
+ case B115200: urb_value = BELKIN_SA_BAUD(115200); break;
+ case B230400: urb_value = BELKIN_SA_BAUD(230400); break;
+ default: err("BELKIN USB Serial Adapter: unsupported baudrate request, using default of 9600");
+ urb_value = BELKIN_SA_BAUD(9600); break;
+ }
+ if ((cflag & CBAUD) != B0 ) {
+ if (BSA_USB_CMD(BELKIN_SA_SET_BAUDRATE_REQUEST, urb_value) < 0)
+ err("Set baudrate error");
+ } else {
+ /* Disable flow control */
+ if (BSA_USB_CMD(BELKIN_SA_SET_FLOW_CTRL_REQUEST, BELKIN_SA_FLOW_NONE) < 0)
+ err("Disable flowcontrol error");
+
+ /* Drop RTS and DTR */
+ control_state &= ~(TIOCM_DTR | TIOCM_RTS);
+ if (BSA_USB_CMD(BELKIN_SA_SET_DTR_REQUEST, 0) < 0)
+ err("DTR LOW error");
+ if (BSA_USB_CMD(BELKIN_SA_SET_RTS_REQUEST, 0) < 0)
+ err("RTS LOW error");
+ }
+ }
+
+ /* set the parity */
+ if( (cflag&(PARENB|PARODD)) != (old_cflag&(PARENB|PARODD)) ) {
+ if (cflag & PARENB)
+ urb_value = (cflag & PARODD) ? BELKIN_SA_PARITY_ODD : BELKIN_SA_PARITY_EVEN;
+ else
+ urb_value = BELKIN_SA_PARITY_NONE;
+ if (BSA_USB_CMD(BELKIN_SA_SET_PARITY_REQUEST, urb_value) < 0)
+ err("Set parity error");
+ }
+
+ /* set the number of data bits */
+ if( (cflag&CSIZE) != (old_cflag&CSIZE) ) {
+ switch (cflag & CSIZE) {
+ case CS5: urb_value = BELKIN_SA_DATA_BITS(5); break;
+ case CS6: urb_value = BELKIN_SA_DATA_BITS(6); break;
+ case CS7: urb_value = BELKIN_SA_DATA_BITS(7); break;
+ case CS8: urb_value = BELKIN_SA_DATA_BITS(8); break;
+ default: err("CSIZE was not CS5-CS8, using default of 8");
+ urb_value = BELKIN_SA_DATA_BITS(8);
+ break;
+ }
+ if (BSA_USB_CMD(BELKIN_SA_SET_DATA_BITS_REQUEST, urb_value) < 0)
+ err("Set data bits error");
+ }
+
+ /* set the number of stop bits */
+ if( (cflag&CSTOPB) != (old_cflag&CSTOPB) ) {
+ urb_value = (cflag & CSTOPB) ? BELKIN_SA_STOP_BITS(2) : BELKIN_SA_STOP_BITS(1);
+ if (BSA_USB_CMD(BELKIN_SA_SET_STOP_BITS_REQUEST, urb_value) < 0)
+ err("Set stop bits error");
+ }
+
+ /* Set flow control */
+ if( (iflag&IXOFF) != (old_iflag&IXOFF)
+ || (iflag&IXON) != (old_iflag&IXON)
+ || (cflag&CRTSCTS) != (old_cflag&CRTSCTS) ) {
+ urb_value = 0;
+ if ((iflag & IXOFF) || (iflag & IXON))
+ urb_value |= (BELKIN_SA_FLOW_OXON | BELKIN_SA_FLOW_IXON);
+ else
+ urb_value &= ~(BELKIN_SA_FLOW_OXON | BELKIN_SA_FLOW_IXON);
+
+ if (cflag & CRTSCTS)
+ urb_value |= (BELKIN_SA_FLOW_OCTS | BELKIN_SA_FLOW_IRTS);
+ else
+ urb_value &= ~(BELKIN_SA_FLOW_OCTS | BELKIN_SA_FLOW_IRTS);
+
+ if (bad_flow_control)
+ urb_value &= ~(BELKIN_SA_FLOW_IRTS);
+
+ if (BSA_USB_CMD(BELKIN_SA_SET_FLOW_CTRL_REQUEST, urb_value) < 0)
+ err("Set flow control error");
+ }
+
+ /* save off the modified port settings */
+ spin_lock_irqsave(&priv->lock, flags);
+ priv->control_state = control_state;
+ spin_unlock_irqrestore(&priv->lock, flags);
+} /* belkin_sa_set_termios */
+
+
+static void belkin_sa_break_ctl( struct usb_serial_port *port, int break_state )
+{
+ struct usb_serial *serial = port->serial;
+
+ if (BSA_USB_CMD(BELKIN_SA_SET_BREAK_REQUEST, break_state ? 1 : 0) < 0)
+ err("Set break_ctl %d", break_state);
+}
+
+
+static int belkin_sa_tiocmget (struct usb_serial_port *port, struct file *file)
+{
+ struct belkin_sa_private *priv = usb_get_serial_port_data(port);
+ unsigned long control_state;
+ unsigned long flags;
+
+ dbg("%s", __FUNCTION__);
+
+ spin_lock_irqsave(&priv->lock, flags);
+ control_state = priv->control_state;
+ spin_unlock_irqrestore(&priv->lock, flags);
+
+ return control_state;
+}
+
+
+static int belkin_sa_tiocmset (struct usb_serial_port *port, struct file *file,
+ unsigned int set, unsigned int clear)
+{
+ struct usb_serial *serial = port->serial;
+ struct belkin_sa_private *priv = usb_get_serial_port_data(port);
+ unsigned long control_state;
+ unsigned long flags;
+ int retval;
+ int rts = 0;
+ int dtr = 0;
+
+ dbg("%s", __FUNCTION__);
+
+ spin_lock_irqsave(&priv->lock, flags);
+ control_state = priv->control_state;
+
+ if (set & TIOCM_RTS) {
+ control_state |= TIOCM_RTS;
+ rts = 1;
+ }
+ if (set & TIOCM_DTR) {
+ control_state |= TIOCM_DTR;
+ dtr = 1;
+ }
+ if (clear & TIOCM_RTS) {
+ control_state &= ~TIOCM_RTS;
+ rts = 0;
+ }
+ if (clear & TIOCM_DTR) {
+ control_state &= ~TIOCM_DTR;
+ dtr = 0;
+ }
+
+ priv->control_state = control_state;
+ spin_unlock_irqrestore(&priv->lock, flags);
+
+ retval = BSA_USB_CMD(BELKIN_SA_SET_RTS_REQUEST, rts);
+ if (retval < 0) {
+ err("Set RTS error %d", retval);
+ goto exit;
+ }
+
+ retval = BSA_USB_CMD(BELKIN_SA_SET_DTR_REQUEST, dtr);
+ if (retval < 0) {
+ err("Set DTR error %d", retval);
+ goto exit;
+ }
+exit:
+ return retval;
+}
+
+
+static int belkin_sa_ioctl (struct usb_serial_port *port, struct file * file, unsigned int cmd, unsigned long arg)
+{
+ switch (cmd) {
+ case TIOCMIWAIT:
+ /* wait for any of the 4 modem inputs (DCD,RI,DSR,CTS)*/
+ /* TODO */
+ return( 0 );
+
+ case TIOCGICOUNT:
+ /* return count of modemline transitions */
+ /* TODO */
+ return 0;
+
+ default:
+ dbg("belkin_sa_ioctl arg not supported - 0x%04x",cmd);
+ return(-ENOIOCTLCMD);
+ break;
+ }
+ return 0;
+} /* belkin_sa_ioctl */
+
+
+static int __init belkin_sa_init (void)
+{
+ int retval;
+ retval = usb_serial_register(&belkin_device);
+ if (retval)
+ goto failed_usb_serial_register;
+ retval = usb_register(&belkin_driver);
+ if (retval)
+ goto failed_usb_register;
+ info(DRIVER_DESC " " DRIVER_VERSION);
+ return 0;
+failed_usb_register:
+ usb_serial_deregister(&belkin_device);
+failed_usb_serial_register:
+ return retval;
+}
+
+
+static void __exit belkin_sa_exit (void)
+{
+ usb_deregister (&belkin_driver);
+ usb_serial_deregister (&belkin_device);
+}
+
+
+module_init (belkin_sa_init);
+module_exit (belkin_sa_exit);
+
+MODULE_AUTHOR( DRIVER_AUTHOR );
+MODULE_DESCRIPTION( DRIVER_DESC );
+MODULE_VERSION( DRIVER_VERSION );
+MODULE_LICENSE("GPL");
+
+module_param(debug, bool, S_IRUGO | S_IWUSR);
+MODULE_PARM_DESC(debug, "Debug enabled or not");