text: // SPDX-License-Identifier: GPL-2.0
  /*
    USB Driver layer for GSM modems
  
    Copyright (C) 2005  Matthias Urlichs <smurf@smurf.noris.de>
  
    Portions copied from the Keyspan driver by Hugh Blemings <hugh@blemings.org>
  
    History: see the git log.
  
    Work sponsored by: Sigos GmbH, Germany <info@sigos.de>
  
    This driver exists because the "normal" serial driver doesn't work too well
    with GSM modems. Issues:
    - data loss -- one single Receive URB is not nearly enough
    - controlling the baud rate doesn't make sense
  */
  
  #define DRIVER_AUTHOR "Matthias Urlichs <smurf@smurf.noris.de>"
  #define DRIVER_DESC "USB Driver for GSM modems"
  
  #include <linux/kernel.h>
  #include <linux/jiffies.h>
  #include <linux/errno.h>
  #include <linux/slab.h>
  #include <linux/tty.h>
  #include <linux/tty_flip.h>
  #include <linux/module.h>
  #include <linux/bitops.h>
  #include <linux/uaccess.h>
  #include <linux/usb.h>
  #include <linux/usb/serial.h>
  #include <linux/serial.h>
  #include "usb-wwan.h"
  
  /*
   * Generate DTR/RTS signals on the port using the SET_CONTROL_LINE_STATE request
   * in CDC ACM.
   */
  static int usb_wwan_send_setup(struct usb_serial_port *port)
  {
  	struct usb_serial *serial = port->serial;
  	struct usb_wwan_port_private *portdata;
  	int val = 0;
  	int ifnum;
  	int res;
  
  	portdata = usb_get_serial_port_data(port);
  
  	if (portdata->dtr_state)
  		val |= 0x01;
  	if (portdata->rts_state)
  		val |= 0x02;
  
  	ifnum = serial->interface->cur_altsetting->desc.bInterfaceNumber;
  
  	res = usb_autopm_get_interface(serial->interface);
  	if (res)
  		return res;
  
  	res = usb_control_msg(serial->dev, usb_sndctrlpipe(serial->dev, 0),
  				0x22, 0x21, val, ifnum, NULL, 0,
  				USB_CTRL_SET_TIMEOUT);
  
  	usb_autopm_put_interface(port->serial->interface);
  
  	return res;
  }
  
  void usb_wwan_dtr_rts(struct usb_serial_port *port, int on)
  {
  	struct usb_wwan_port_private *portdata;
  	struct usb_wwan_intf_private *intfdata;
  
  	intfdata = usb_get_serial_data(port->serial);
  
  	if (!intfdata->use_send_setup)
  		return;
  
  	portdata = usb_get_serial_port_data(port);
  	/* FIXME: locking */
  	portdata->rts_state = on;
  	portdata->dtr_state = on;
  
  	usb_wwan_send_setup(port);
  }
  EXPORT_SYMBOL(usb_wwan_dtr_rts);
  
  int usb_wwan_tiocmget(struct tty_struct *tty)
  {
  	struct usb_serial_port *port = tty->driver_data;
  	unsigned int value;
  	struct usb_wwan_port_private *portdata;
  
  	portdata = usb_get_serial_port_data(port);
  
  	value = ((portdata->rts_state) ? TIOCM_RTS : 0) |
  	    ((portdata->dtr_state) ? TIOCM_DTR : 0) |
  	    ((portdata->cts_state) ? TIOCM_CTS : 0) |
  	    ((portdata->dsr_state) ? TIOCM_DSR : 0) |
  	    ((portdata->dcd_state) ? TIOCM_CAR : 0) |
  	    ((portdata->ri_state) ? TIOCM_RNG : 0);
  
  	return value;
  }
  EXPORT_SYMBOL(usb_wwan_tiocmget);
  
  int usb_wwan_tiocmset(struct tty_struct *tty,
  		      unsigned int set, unsigned int clear)
  {
  	struct usb_serial_port *port = tty->driver_data;
  	struct usb_wwan_port_private *portdata;
  	struct usb_wwan_intf_private *intfdata;
  
  	portdata = usb_get_serial_port_data(port);
  	intfdata = usb_get_serial_data(port->serial);
  
  	if (!intfdata->use_send_setup)
  		return -EINVAL;
  
  	/* FIXME: what locks portdata fields ? */
  	if (set & TIOCM_RTS)
  		portdata->rts_state = 1;
  	if (set & TIOCM_DTR)
  		portdata->dtr_state = 1;
  
  	if (clear & TIOCM_RTS)
  		portdata->rts_state = 0;
  	if (clear & TIOCM_DTR)
  		portdata->dtr_state = 0;
  	return usb_wwan_send_setup(port);
  }
  EXPORT_SYMBOL(usb_wwan_tiocmset);
  
  static int get_serial_info(struct usb_serial_port *port,
  			   struct serial_struct __user *retinfo)
  {
  	struct serial_struct tmp;
  
  	memset(&tmp, 0, sizeof(tmp));
  	tmp.line            = port->minor;
  	tmp.port            = port->port_number;
  	tmp.baud_base       = tty_get_baud_rate(port->port.tty);
  	tmp.close_delay	    = port->port.close_delay / 10;
  	tmp.closing_wait    = port->port.closing_wait == ASYNC_CLOSING_WAIT_NONE ?
  				 ASYNC_CLOSING_WAIT_NONE :
  				 port->port.closing_wait / 10;
  
  	if (copy_to_user(retinfo, &tmp, sizeof(*retinfo)))
  		return -EFAULT;
  	return 0;
  }
  
  static int set_serial_info(struct usb_serial_port *port,
  			   struct serial_struct __user *newinfo)
  {
  	struct serial_struct new_serial;
  	unsigned int closing_wait, close_delay;
  	int retval = 0;
  
  	if (copy_from_user(&new_serial, newinfo, sizeof(new_serial)))
  		return -EFAULT;
  
  	close_delay = new_serial.close_delay * 10;
  	closing_wait = new_serial.closing_wait == ASYNC_CLOSING_WAIT_NONE ?
  			ASYNC_CLOSING_WAIT_NONE : new_serial.closing_wait * 10;
  
  	mutex_lock(&port->port.mutex);
  
  	if (!capable(CAP_SYS_ADMIN)) {
  		if ((close_delay != port->port.close_delay) ||
  		    (closing_wait != port->port.closing_wait))
  			retval = -EPERM;
  		else
  			retval = -EOPNOTSUPP;
  	} else {
  		port->port.close_delay  = close_delay;
  		port->port.closing_wait = closing_wait;
  	}
  
  	mutex_unlock(&port->port.mutex);
  	return retval;
  }
  
  int usb_wwan_ioctl(struct tty_struct *tty,
  		   unsigned int cmd, unsigned long arg)
  {
  	struct usb_serial_port *port = tty->driver_data;
  
  	dev_dbg(&port->dev, "%s cmd 0x%04x\n", __func__, cmd);
  
  	switch (cmd) {
  	case TIOCGSERIAL:
  		return get_serial_info(port,
  				       (struct serial_struct __user *) arg);
  	case TIOCSSERIAL:
  		return set_serial_info(port,
  				       (struct serial_struct __user *) arg);
  	default:
  		break;
  	}
  
  	dev_dbg(&port->dev, "%s arg not supported\n", __func__);
  
  	return -ENOIOCTLCMD;
  }
  EXPORT_SYMBOL(usb_wwan_ioctl);
  
  int usb_wwan_write(struct tty_struct *tty, struct usb_serial_port *port,
  		   const unsigned char *buf, int count)
  {
  	struct usb_wwan_port_private *portdata;
  	struct usb_wwan_intf_private *intfdata;
  	int i;
  	int left, todo;
  	struct urb *this_urb = NULL;	/* spurious */
  	int err;
  	unsigned long flags;
  
  	portdata = usb_get_serial_port_data(port);
  	intfdata = usb_get_serial_data(port->serial);
  
  	dev_dbg(&port->dev, "%s: write (%d chars)\n", __func__, count);
  
  	i = 0;
  	left = count;
  	for (i = 0; left > 0 && i < N_OUT_URB; i++) {
  		todo = left;
  		if (todo > OUT_BUFLEN)
  			todo = OUT_BUFLEN;
  
  		this_urb = portdata->out_urbs[i];
  		if (test_and_set_bit(i, &portdata->out_busy)) {
  			if (time_before(jiffies,
  					portdata->tx_start_time[i] + 10 * HZ))
  				continue;
  			usb_unlink_urb(this_urb);
  			continue;
  		}
  		dev_dbg(&port->dev, "%s: endpoint %d buf %d\n", __func__,
  			usb_pipeendpoint(this_urb->pipe), i);
  
  		err = usb_autopm_get_interface_async(port->serial->interface);
  		if (err < 0) {
  			clear_bit(i, &portdata->out_busy);
  			break;
  		}
  
  		/* send the data */
  		memcpy(this_urb->transfer_buffer, buf, todo);
  		this_urb->transfer_buffer_length = todo;
  
  		spin_lock_irqsave(&intfdata->susp_lock, flags);
  		if (intfdata->suspended) {
  			usb_anchor_urb(this_urb, &portdata->delayed);
  			spin_unlock_irqrestore(&intfdata->susp_lock, flags);
  		} else {
  			intfdata->in_flight++;
  			spin_unlock_irqrestore(&intfdata->susp_lock, flags);
  			err = usb_submit_urb(this_urb, GFP_ATOMIC);
  			if (err) {
  				dev_err(&port->dev,
  					"%s: submit urb %d failed: %d\n",
  					__func__, i, err);
  				clear_bit(i, &portdata->out_busy);
  				spin_lock_irqsave(&intfdata->susp_lock, flags);
  				intfdata->in_flight--;
  				spin_unlock_irqrestore(&intfdata->susp_lock,
  						       flags);
  				usb_autopm_put_interface_async(port->serial->interface);
  				break;
  			}
  		}
  
  		portdata->tx_start_time[i] = jiffies;
  		buf += todo;
  		left -= todo;
  	}
  
  	count -= left;
  	dev_dbg(&port->dev, "%s: wrote (did %d)\n", __func__, count);
  	return count;
  }
  EXPORT_SYMBOL(usb_wwan_write);
  
  static void usb_wwan_indat_callback(struct urb *urb)
  {
  	int err;
  	int endpoint;
  	struct usb_serial_port *port;
  	struct device *dev;
  	unsigned char *data = urb->transfer_buffer;
  	int status = urb->status;
  
  	endpoint = usb_pipeendpoint(urb->pipe);
  	port = urb->context;
  	dev = &port->dev;
  
  	if (status) {
  		dev_dbg(dev, "%s: nonzero status: %d on endpoint %02x.\n",
  			__func__, status, endpoint);
  	} else {
  		if (urb->actual_length) {
  			tty_insert_flip_string(&port->port, data,
  					urb->actual_length);
  			tty_flip_buffer_push(&port->port);
  		} else
  			dev_dbg(dev, "%s: empty read urb received\n", __func__);
  	}
  	/* Resubmit urb so we continue receiving */
  	err = usb_submit_urb(urb, GFP_ATOMIC);
  	if (err) {
  		if (err != -EPERM && err != -ENODEV) {
  			dev_err(dev, "%s: resubmit read urb failed. (%d)\n",
  				__func__, err);
  			/* busy also in error unless we are killed */
  			usb_mark_last_busy(port->serial->dev);
  		}
  	} else {
  		usb_mark_last_busy(port->serial->dev);
  	}
  }
  
  static void usb_wwan_outdat_callback(struct urb *urb)
  {
  	struct usb_serial_port *port;
  	struct usb_wwan_port_private *portdata;
  	struct usb_wwan_intf_private *intfdata;
  	unsigned long flags;
  	int i;
  
  	port = urb->context;
  	intfdata = usb_get_serial_data(port->serial);
  
  	usb_serial_port_softint(port);
  	usb_autopm_put_interface_async(port->serial->interface);
  	portdata = usb_get_serial_port_data(port);
  	spin_lock_irqsave(&intfdata->susp_lock, flags);
  	intfdata->in_flight--;
  	spin_unlock_irqrestore(&intfdata->susp_lock, flags);
  
  	for (i = 0; i < N_OUT_URB; ++i) {
  		if (portdata->out_urbs[i] == urb) {
  			smp_mb__before_atomic();
  			clear_bit(i, &portdata->out_busy);
  			break;
  		}
  	}
  }
  
  int usb_wwan_write_room(struct tty_struct *tty)
  {
  	struct usb_serial_port *port = tty->driver_data;
  	struct usb_wwan_port_private *portdata;
  	int i;
  	int data_len = 0;
  	struct urb *this_urb;
  
  	portdata = usb_get_serial_port_data(port);
  
  	for (i = 0; i < N_OUT_URB; i++) {
  		this_urb = portdata->out_urbs[i];
  		if (this_urb && !test_bit(i, &portdata->out_busy))
  			data_len += OUT_BUFLEN;
  	}
  
  	dev_dbg(&port->dev, "%s: %d\n", __func__, data_len);
  	return data_len;
  }
  EXPORT_SYMBOL(usb_wwan_write_room);
  
  int usb_wwan_chars_in_buffer(struct tty_struct *tty)
  {
  	struct usb_serial_port *port = tty->driver_data;
  	struct usb_wwan_port_private *portdata;
  	int i;
  	int data_len = 0;
  	struct urb *this_urb;
  
  	portdata = usb_get_serial_port_data(port);
  
  	for (i = 0; i < N_OUT_URB; i++) {
  		this_urb = portdata->out_urbs[i];
  		/* FIXME: This locking is insufficient as this_urb may
  		   go unused during the test */
  		if (this_urb && test_bit(i, &portdata->out_busy))
  			data_len += this_urb->transfer_buffer_length;
  	}
  	dev_dbg(&port->dev, "%s: %d\n", __func__, data_len);
  	return data_len;
  }
  EXPORT_SYMBOL(usb_wwan_chars_in_buffer);
  
  int usb_wwan_open(struct tty_struct *tty, struct usb_serial_port *port)
  {
  	struct usb_wwan_port_private *portdata;
  	struct usb_wwan_intf_private *intfdata;
  	struct usb_serial *serial = port->serial;
  	int i, err;
  	struct urb *urb;
  
  	portdata = usb_get_serial_port_data(port);
  	intfdata = usb_get_serial_data(serial);
  
  	if (port->interrupt_in_urb) {
  		err = usb_submit_urb(port->interrupt_in_urb, GFP_KERNEL);
  		if (err) {
  			dev_err(&port->dev, "%s: submit int urb failed: %d\n",
  				__func__, err);
  		}
  	}
  
  	/* Start reading from the IN endpoint */
  	for (i = 0; i < N_IN_URB; i++) {
  		urb = portdata->in_urbs[i];
  		if (!urb)
  			continue;
  		err = usb_submit_urb(urb, GFP_KERNEL);
  		if (err) {
  			dev_err(&port->dev,
  				"%s: submit read urb %d failed: %d\n",
  				__func__, i, err);
  		}
  	}
  
  	spin_lock_irq(&intfdata->susp_lock);
  	if (++intfdata->open_ports == 1)
  		serial->interface->needs_remote_wakeup = 1;
  	spin_unlock_irq(&intfdata->susp_lock);
  	/* this balances a get in the generic USB serial code */
  	usb_autopm_put_interface(serial->interface);
  
  	return 0;
  }
  EXPORT_SYMBOL(usb_wwan_open);
  
  static void unbusy_queued_urb(struct urb *urb,
  					struct usb_wwan_port_private *portdata)
  {
  	int i;
  
  	for (i = 0; i < N_OUT_URB; i++) {
  		if (urb == portdata->out_urbs[i]) {
  			clear_bit(i, &portdata->out_busy);
  			break;
  		}
  	}
  }
  
  void usb_wwan_close(struct usb_serial_port *port)
  {
  	int i;
  	struct usb_serial *serial = port->serial;
  	struct usb_wwan_port_private *portdata;
  	struct usb_wwan_intf_private *intfdata = usb_get_serial_data(serial);
  	struct urb *urb;
  
  	portdata = usb_get_serial_port_data(port);
  
  	/*
  	 * Need to take susp_lock to make sure port is not already being
  	 * resumed, but no need to hold it due to initialized
  	 */
  	spin_lock_irq(&intfdata->susp_lock);
  	if (--intfdata->open_ports == 0)
  		serial->interface->needs_remote_wakeup = 0;
  	spin_unlock_irq(&intfdata->susp_lock);
  
  	for (;;) {
  		urb = usb_get_from_anchor(&portdata->delayed);
  		if (!urb)
  			break;
  		unbusy_queued_urb(urb, portdata);
  		usb_autopm_put_interface_async(serial->interface);
  	}
  
  	for (i = 0; i < N_IN_URB; i++)
  		usb_kill_urb(portdata->in_urbs[i]);
  	for (i = 0; i < N_OUT_URB; i++)
  		usb_kill_urb(portdata->out_urbs[i]);
  	usb_kill_urb(port->interrupt_in_urb);
  
  	usb_autopm_get_interface_no_resume(serial->interface);
  }
  EXPORT_SYMBOL(usb_wwan_close);
  
  static struct urb *usb_wwan_setup_urb(struct usb_serial_port *port,
  				      int endpoint,
  				      int dir, void *ctx, char *buf, int len,
  				      void (*callback) (struct urb *))
  {
  	struct usb_serial *serial = port->serial;
  	struct usb_wwan_intf_private *intfdata = usb_get_serial_data(serial);
  	struct urb *urb;
  
  	urb = usb_alloc_urb(0, GFP_KERNEL);	/* No ISO */
  	if (!urb)
  		return NULL;
  
  	usb_fill_bulk_urb(urb, serial->dev,
  			  usb_sndbulkpipe(serial->dev, endpoint) | dir,
  			  buf, len, callback, ctx);
  
  	if (intfdata->use_zlp && dir == USB_DIR_OUT)
  		urb->transfer_flags |= URB_ZERO_PACKET;
  
  	return urb;
  }
  
  int usb_wwan_port_probe(struct usb_serial_port *port)
  {
  	struct usb_wwan_port_private *portdata;
  	struct urb *urb;
  	u8 *buffer;
  	int i;
  
  	if (!port->bulk_in_size || !port->bulk_out_size)
  		return -ENODEV;
  
  	portdata = kzalloc(sizeof(*portdata), GFP_KERNEL);
  	if (!portdata)
  		return -ENOMEM;
  
  	init_usb_anchor(&portdata->delayed);
  
  	for (i = 0; i < N_IN_URB; i++) {
  		buffer = (u8 *)__get_free_page(GFP_KERNEL);
  		if (!buffer)
  			goto bail_out_error;
  		portdata->in_buffer[i] = buffer;
  
  		urb = usb_wwan_setup_urb(port, port->bulk_in_endpointAddress,
  						USB_DIR_IN, port,
  						buffer, IN_BUFLEN,
  						usb_wwan_indat_callback);
  		portdata->in_urbs[i] = urb;
  	}
  
  	for (i = 0; i < N_OUT_URB; i++) {
  		buffer = kmalloc(OUT_BUFLEN, GFP_KERNEL);
  		if (!buffer)
  			goto bail_out_error2;
  		portdata->out_buffer[i] = buffer;
  
  		urb = usb_wwan_setup_urb(port, port->bulk_out_endpointAddress,
  						USB_DIR_OUT, port,
  						buffer, OUT_BUFLEN,
  						usb_wwan_outdat_callback);
  		portdata->out_urbs[i] = urb;
  	}
  
  	usb_set_serial_port_data(port, portdata);
  
  	return 0;
  
  bail_out_error2:
  	for (i = 0; i < N_OUT_URB; i++) {
  		usb_free_urb(portdata->out_urbs[i]);
  		kfree(portdata->out_buffer[i]);
  	}
  bail_out_error:
  	for (i = 0; i < N_IN_URB; i++) {
  		usb_free_urb(portdata->in_urbs[i]);
  		free_page((unsigned long)portdata->in_buffer[i]);
  	}
  	kfree(portdata);
  
  	return -ENOMEM;
  }
  EXPORT_SYMBOL_GPL(usb_wwan_port_probe);
  
  int usb_wwan_port_remove(struct usb_serial_port *port)
  {
  	int i;
  	struct usb_wwan_port_private *portdata;
  
  	portdata = usb_get_serial_port_data(port);
  	usb_set_serial_port_data(port, NULL);
  
  	for (i = 0; i < N_IN_URB; i++) {
  		usb_free_urb(portdata->in_urbs[i]);
  		free_page((unsigned long)portdata->in_buffer[i]);
  	}
  	for (i = 0; i < N_OUT_URB; i++) {
  		usb_free_urb(portdata->out_urbs[i]);
  		kfree(portdata->out_buffer[i]);
  	}
  
  	kfree(portdata);
  
  	return 0;
  }
  EXPORT_SYMBOL(usb_wwan_port_remove);
  
  #ifdef CONFIG_PM
  static void stop_urbs(struct usb_serial *serial)
  {
  	int i, j;
  	struct usb_serial_port *port;
  	struct usb_wwan_port_private *portdata;
  
  	for (i = 0; i < serial->num_ports; ++i) {
  		port = serial->port[i];
  		portdata = usb_get_serial_port_data(port);
  		if (!portdata)
  			continue;
  		for (j = 0; j < N_IN_URB; j++)
  			usb_kill_urb(portdata->in_urbs[j]);
  		for (j = 0; j < N_OUT_URB; j++)
  			usb_kill_urb(portdata->out_urbs[j]);
  		usb_kill_urb(port->interrupt_in_urb);
  	}
  }
  
  int usb_wwan_suspend(struct usb_serial *serial, pm_message_t message)
  {
  	struct usb_wwan_intf_private *intfdata = usb_get_serial_data(serial);
  
  	spin_lock_irq(&intfdata->susp_lock);
  	if (PMSG_IS_AUTO(message)) {
  		if (intfdata->in_flight) {
  			spin_unlock_irq(&intfdata->susp_lock);
  			return -EBUSY;
  		}
  	}
  	intfdata->suspended = 1;
  	spin_unlock_irq(&intfdata->susp_lock);
  
  	stop_urbs(serial);
  
  	return 0;
  }
  EXPORT_SYMBOL(usb_wwan_suspend);
  
  /* Caller must hold susp_lock. */
  static int usb_wwan_submit_delayed_urbs(struct usb_serial_port *port)
  {
  	struct usb_serial *serial = port->serial;
  	struct usb_wwan_intf_private *data = usb_get_serial_data(serial);
  	struct usb_wwan_port_private *portdata;
  	struct urb *urb;
  	int err_count = 0;
  	int err;
  
  	portdata = usb_get_serial_port_data(port);
  
  	for (;;) {
  		urb = usb_get_from_anchor(&portdata->delayed);
  		if (!urb)
  			break;
  
  		err = usb_submit_urb(urb, GFP_ATOMIC);
  		if (err) {
  			dev_err(&port->dev, "%s: submit urb failed: %d\n",
  					__func__, err);
  			err_count++;
  			unbusy_queued_urb(urb, portdata);
  			usb_autopm_put_interface_async(serial->interface);
  			continue;
  		}
  		data->in_flight++;
  	}
  
  	if (err_count)
  		return -EIO;
  
  	return 0;
  }
  
  int usb_wwan_resume(struct usb_serial *serial)
  {
  	int i, j;
  	struct usb_serial_port *port;
  	struct usb_wwan_intf_private *intfdata = usb_get_serial_data(serial);
  	struct usb_wwan_port_private *portdata;
  	struct urb *urb;
  	int err;
  	int err_count = 0;
  
  	spin_lock_irq(&intfdata->susp_lock);
  	for (i = 0; i < serial->num_ports; i++) {
  		port = serial->port[i];
  
  		if (!tty_port_initialized(&port->port))
  			continue;
  
  		portdata = usb_get_serial_port_data(port);
  
  		if (port->interrupt_in_urb) {
  			err = usb_submit_urb(port->interrupt_in_urb,
  					GFP_ATOMIC);
  			if (err) {
  				dev_err(&port->dev,
  					"%s: submit int urb failed: %d\n",
  					__func__, err);
  				err_count++;
  			}
  		}
  
  		err = usb_wwan_submit_delayed_urbs(port);
  		if (err)
  			err_count++;
  
  		for (j = 0; j < N_IN_URB; j++) {
  			urb = portdata->in_urbs[j];
  			err = usb_submit_urb(urb, GFP_ATOMIC);
  			if (err < 0) {
  				dev_err(&port->dev,
  					"%s: submit read urb %d failed: %d\n",
  					__func__, i, err);
  				err_count++;
  			}
  		}
  	}
  	intfdata->suspended = 0;
  	spin_unlock_irq(&intfdata->susp_lock);
  
  	if (err_count)
  		return -EIO;
  
  	return 0;
  }
  EXPORT_SYMBOL(usb_wwan_resume);
  #endif
  
  MODULE_AUTHOR(DRIVER_AUTHOR);
  MODULE_DESCRIPTION(DRIVER_DESC);
  MODULE_LICENSE("GPL v2");
  