[deliverable/linux.git] / drivers / usb / serial / usb_wwan.c

/*
  USB Driver layer for GSM modems

  Copyright (C) 2005  Matthias Urlichs <smurf@smurf.noris.de>

  This driver is free software; you can redistribute it and/or modify
  it under the terms of Version 2 of the GNU General Public License as
  published by the Free Software Foundation.

  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_VERSION "v0.7.2"
#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"

static int debug;

void usb_wwan_dtr_rts(struct usb_serial_port *port, int on)
{
	struct usb_serial *serial = port->serial;
	struct usb_wwan_port_private *portdata;

	struct usb_wwan_intf_private *intfdata;

	dbg("%s", __func__);

	intfdata = port->serial->private;

	if (!intfdata->send_setup)
		return;

	portdata = usb_get_serial_port_data(port);
	mutex_lock(&serial->disc_mutex);
	portdata->rts_state = on;
	portdata->dtr_state = on;
	if (serial->dev)
		intfdata->send_setup(port);
	mutex_unlock(&serial->disc_mutex);
}
EXPORT_SYMBOL(usb_wwan_dtr_rts);

void usb_wwan_set_termios(struct tty_struct *tty,
			  struct usb_serial_port *port,
			  struct ktermios *old_termios)
{
	struct usb_wwan_intf_private *intfdata = port->serial->private;

	dbg("%s", __func__);

	/* Doesn't support option setting */
	tty_termios_copy_hw(tty->termios, old_termios);

	if (intfdata->send_setup)
		intfdata->send_setup(port);
}
EXPORT_SYMBOL(usb_wwan_set_termios);

int usb_wwan_tiocmget(struct tty_struct *tty, struct file *file)
{
	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, struct file *file,
		      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 = port->serial->private;

	if (!intfdata->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 intfdata->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;

	if (!retinfo)
		return -EFAULT;

	memset(&tmp, 0, sizeof(tmp));
	tmp.line            = port->serial->minor;
	tmp.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, struct file *file,
		   unsigned int cmd, unsigned long arg)
{
	struct usb_serial_port *port = tty->driver_data;

	dbg("%s cmd 0x%04x", __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;
	}

	dbg("%s arg not supported", __func__);

	return -ENOIOCTLCMD;
}
EXPORT_SYMBOL(usb_wwan_ioctl);

/* Write */
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 = port->serial->private;

	dbg("%s: write (%d chars)", __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;
		}
		dbg("%s: endpoint %d buf %d", __func__,
		    usb_pipeendpoint(this_urb->pipe), i);

		err = usb_autopm_get_interface_async(port->serial->interface);
		if (err < 0)
			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) {
				dbg("usb_submit_urb %p (write bulk) failed "
				    "(%d)", this_urb, 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;
	dbg("%s: wrote (did %d)", __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 tty_struct *tty;
	unsigned char *data = urb->transfer_buffer;
	int status = urb->status;

	dbg("%s: %p", __func__, urb);

	endpoint = usb_pipeendpoint(urb->pipe);
	port = urb->context;

	if (status) {
		dbg("%s: nonzero status: %d on endpoint %02x.",
		    __func__, status, endpoint);
	} else {
		tty = tty_port_tty_get(&port->port);
		if (urb->actual_length) {
			tty_insert_flip_string(tty, data, urb->actual_length);
			tty_flip_buffer_push(tty);
		} else
			dbg("%s: empty read urb received", __func__);
		tty_kref_put(tty);

		/* Resubmit urb so we continue receiving */
		if (status != -ESHUTDOWN) {
			err = usb_submit_urb(urb, GFP_ATOMIC);
			if (err) {
				if (err != -EPERM) {
					printk(KERN_ERR "%s: resubmit read urb failed. "
						"(%d)", __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;
	int i;

	dbg("%s", __func__);

	port = urb->context;
	intfdata = port->serial->private;

	usb_serial_port_softint(port);
	usb_autopm_put_interface_async(port->serial->interface);
	portdata = usb_get_serial_port_data(port);
	spin_lock(&intfdata->susp_lock);
	intfdata->in_flight--;
	spin_unlock(&intfdata->susp_lock);

	for (i = 0; i < N_OUT_URB; ++i) {
		if (portdata->out_urbs[i] == urb) {
			smp_mb__before_clear_bit();
			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;
	}

	dbg("%s: %d", __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;
	}
	dbg("%s: %d", __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 = serial->private;

	dbg("%s", __func__);

	/* 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) {
			dbg("%s: submit urb %d failed (%d) %d",
			    __func__, i, err, urb->transfer_buffer_length);
		}
	}

	if (intfdata->send_setup)
		intfdata->send_setup(port);

	serial->interface->needs_remote_wakeup = 1;
	spin_lock_irq(&intfdata->susp_lock);
	portdata->opened = 1;
	spin_unlock_irq(&intfdata->susp_lock);
	usb_autopm_put_interface(serial->interface);

	return 0;
}
EXPORT_SYMBOL(usb_wwan_open);

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 = port->serial->private;

	dbg("%s", __func__);
	portdata = usb_get_serial_port_data(port);

	if (serial->dev) {
		/* Stop reading/writing urbs */
		spin_lock_irq(&intfdata->susp_lock);
		portdata->opened = 0;
		spin_unlock_irq(&intfdata->susp_lock);

		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_autopm_get_interface(serial->interface);
		serial->interface->needs_remote_wakeup = 0;
	}
}
EXPORT_SYMBOL(usb_wwan_close);

/* Helper functions used by usb_wwan_setup_urbs */
static struct urb *usb_wwan_setup_urb(struct usb_serial *serial, int endpoint,
				      int dir, void *ctx, char *buf, int len,
				      void (*callback) (struct urb *))
{
	struct urb *urb;

	if (endpoint == -1)
		return NULL;	/* endpoint not needed */

	urb = usb_alloc_urb(0, GFP_KERNEL);	/* No ISO */
	if (urb == NULL) {
		dbg("%s: alloc for endpoint %d failed.", __func__, endpoint);
		return NULL;
	}

	/* Fill URB using supplied data. */
	usb_fill_bulk_urb(urb, serial->dev,
			  usb_sndbulkpipe(serial->dev, endpoint) | dir,
			  buf, len, callback, ctx);

	return urb;
}

/* Setup urbs */
static void usb_wwan_setup_urbs(struct usb_serial *serial)
{
	int i, j;
	struct usb_serial_port *port;
	struct usb_wwan_port_private *portdata;

	dbg("%s", __func__);

	for (i = 0; i < serial->num_ports; i++) {
		port = serial->port[i];
		portdata = usb_get_serial_port_data(port);

		/* Do indat endpoints first */
		for (j = 0; j < N_IN_URB; ++j) {
			portdata->in_urbs[j] = usb_wwan_setup_urb(serial,
								  port->
								  bulk_in_endpointAddress,
								  USB_DIR_IN,
								  port,
								  portdata->
								  in_buffer[j],
								  IN_BUFLEN,
								  usb_wwan_indat_callback);
		}

		/* outdat endpoints */
		for (j = 0; j < N_OUT_URB; ++j) {
			portdata->out_urbs[j] = usb_wwan_setup_urb(serial,
								   port->
								   bulk_out_endpointAddress,
								   USB_DIR_OUT,
								   port,
								   portdata->
								   out_buffer
								   [j],
								   OUT_BUFLEN,
								   usb_wwan_outdat_callback);
		}
	}
}

int usb_wwan_startup(struct usb_serial *serial)
{
	int i, j, err;
	struct usb_serial_port *port;
	struct usb_wwan_port_private *portdata;
	u8 *buffer;

	dbg("%s", __func__);

	/* Now setup per port private data */
	for (i = 0; i < serial->num_ports; i++) {
		port = serial->port[i];
		portdata = kzalloc(sizeof(*portdata), GFP_KERNEL);
		if (!portdata) {
			dbg("%s: kmalloc for usb_wwan_port_private (%d) failed!.",
			    __func__, i);
			return 1;
		}
		init_usb_anchor(&portdata->delayed);

		for (j = 0; j < N_IN_URB; j++) {
			buffer = (u8 *) __get_free_page(GFP_KERNEL);
			if (!buffer)
				goto bail_out_error;
			portdata->in_buffer[j] = buffer;
		}

		for (j = 0; j < N_OUT_URB; j++) {
			buffer = kmalloc(OUT_BUFLEN, GFP_KERNEL);
			if (!buffer)
				goto bail_out_error2;
			portdata->out_buffer[j] = buffer;
		}

		usb_set_serial_port_data(port, portdata);

		if (!port->interrupt_in_urb)
			continue;
		err = usb_submit_urb(port->interrupt_in_urb, GFP_KERNEL);
		if (err)
			dbg("%s: submit irq_in urb failed %d", __func__, err);
	}
	usb_wwan_setup_urbs(serial);
	return 0;

bail_out_error2:
	for (j = 0; j < N_OUT_URB; j++)
		kfree(portdata->out_buffer[j]);
bail_out_error:
	for (j = 0; j < N_IN_URB; j++)
		if (portdata->in_buffer[j])
			free_page((unsigned long)portdata->in_buffer[j]);
	kfree(portdata);
	return 1;
}
EXPORT_SYMBOL(usb_wwan_startup);

static void stop_read_write_urbs(struct usb_serial *serial)
{
	int i, j;
	struct usb_serial_port *port;
	struct usb_wwan_port_private *portdata;

	/* Stop reading/writing urbs */
	for (i = 0; i < serial->num_ports; ++i) {
		port = serial->port[i];
		portdata = usb_get_serial_port_data(port);
		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]);
	}
}

void usb_wwan_disconnect(struct usb_serial *serial)
{
	dbg("%s", __func__);

	stop_read_write_urbs(serial);
}
EXPORT_SYMBOL(usb_wwan_disconnect);

void usb_wwan_release(struct usb_serial *serial)
{
	int i, j;
	struct usb_serial_port *port;
	struct usb_wwan_port_private *portdata;

	dbg("%s", __func__);

	/* Now free them */
	for (i = 0; i < serial->num_ports; ++i) {
		port = serial->port[i];
		portdata = usb_get_serial_port_data(port);

		for (j = 0; j < N_IN_URB; j++) {
			usb_free_urb(portdata->in_urbs[j]);
			free_page((unsigned long)
				  portdata->in_buffer[j]);
			portdata->in_urbs[j] = NULL;
		}
		for (j = 0; j < N_OUT_URB; j++) {
			usb_free_urb(portdata->out_urbs[j]);
			kfree(portdata->out_buffer[j]);
			portdata->out_urbs[j] = NULL;
		}
	}

	/* Now free per port private data */
	for (i = 0; i < serial->num_ports; i++) {
		port = serial->port[i];
		kfree(usb_get_serial_port_data(port));
	}
}
EXPORT_SYMBOL(usb_wwan_release);

#ifdef CONFIG_PM
int usb_wwan_suspend(struct usb_serial *serial, pm_message_t message)
{
	struct usb_wwan_intf_private *intfdata = serial->private;
	int b;

	dbg("%s entered", __func__);

	if (message.event & PM_EVENT_AUTO) {
		spin_lock_irq(&intfdata->susp_lock);
		b = intfdata->in_flight;
		spin_unlock_irq(&intfdata->susp_lock);

		if (b)
			return -EBUSY;
	}

	spin_lock_irq(&intfdata->susp_lock);
	intfdata->suspended = 1;
	spin_unlock_irq(&intfdata->susp_lock);
	stop_read_write_urbs(serial);

	return 0;
}
EXPORT_SYMBOL(usb_wwan_suspend);

static void play_delayed(struct usb_serial_port *port)
{
	struct usb_wwan_intf_private *data;
	struct usb_wwan_port_private *portdata;
	struct urb *urb;
	int err;

	portdata = usb_get_serial_port_data(port);
	data = port->serial->private;
	while ((urb = usb_get_from_anchor(&portdata->delayed))) {
		err = usb_submit_urb(urb, GFP_ATOMIC);
		if (!err)
			data->in_flight++;
	}
}

int usb_wwan_resume(struct usb_serial *serial)
{
	int i, j;
	struct usb_serial_port *port;
	struct usb_wwan_intf_private *intfdata = serial->private;
	struct usb_wwan_port_private *portdata;
	struct urb *urb;
	int err = 0;

	dbg("%s entered", __func__);
	/* get the interrupt URBs resubmitted unconditionally */
	for (i = 0; i < serial->num_ports; i++) {
		port = serial->port[i];
		if (!port->interrupt_in_urb) {
			dbg("%s: No interrupt URB for port %d", __func__, i);
			continue;
		}
		err = usb_submit_urb(port->interrupt_in_urb, GFP_NOIO);
		dbg("Submitted interrupt URB for port %d (result %d)", i, err);
		if (err < 0) {
			err("%s: Error %d for interrupt URB of port%d",
			    __func__, err, i);
			goto err_out;
		}
	}

	for (i = 0; i < serial->num_ports; i++) {
		/* walk all ports */
		port = serial->port[i];
		portdata = usb_get_serial_port_data(port);

		/* skip closed ports */
		spin_lock_irq(&intfdata->susp_lock);
		if (!portdata->opened) {
			spin_unlock_irq(&intfdata->susp_lock);
			continue;
		}

		for (j = 0; j < N_IN_URB; j++) {
			urb = portdata->in_urbs[j];
			err = usb_submit_urb(urb, GFP_ATOMIC);
			if (err < 0) {
				err("%s: Error %d for bulk URB %d",
				    __func__, err, i);
				spin_unlock_irq(&intfdata->susp_lock);
				goto err_out;
			}
		}
		play_delayed(port);
		spin_unlock_irq(&intfdata->susp_lock);
	}
	spin_lock_irq(&intfdata->susp_lock);
	intfdata->suspended = 0;
	spin_unlock_irq(&intfdata->susp_lock);
err_out:
	return err;
}
EXPORT_SYMBOL(usb_wwan_resume);
#endif

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 messages");
Commit	Line	Data
0d456194 MG	1	/*
	2	USB Driver layer for GSM modems
	3
	4	Copyright (C) 2005 Matthias Urlichs <smurf@smurf.noris.de>
	5
	6	This driver is free software; you can redistribute it and/or modify
	7	it under the terms of Version 2 of the GNU General Public License as
	8	published by the Free Software Foundation.
	9
	10	Portions copied from the Keyspan driver by Hugh Blemings <hugh@blemings.org>
	11
	12	History: see the git log.
	13
	14	Work sponsored by: Sigos GmbH, Germany <info@sigos.de>
	15
	16	This driver exists because the "normal" serial driver doesn't work too well
	17	with GSM modems. Issues:
	18	- data loss -- one single Receive URB is not nearly enough
	19	- controlling the baud rate doesn't make sense
	20	*/
	21
	22	#define DRIVER_VERSION "v0.7.2"
	23	#define DRIVER_AUTHOR "Matthias Urlichs <smurf@smurf.noris.de>"
	24	#define DRIVER_DESC "USB Driver for GSM modems"
	25
	26	#include <linux/kernel.h>
	27	#include <linux/jiffies.h>
	28	#include <linux/errno.h>
	29	#include <linux/slab.h>
	30	#include <linux/tty.h>
	31	#include <linux/tty_flip.h>
	32	#include <linux/module.h>
	33	#include <linux/bitops.h>
66921edd	34	#include <linux/uaccess.h>
0d456194 MG	35	#include <linux/usb.h>
0d456194 MG	36	#include <linux/usb/serial.h>
02303f73	37	#include <linux/serial.h>
0d456194 MG	38	#include "usb-wwan.h"
	39
	40	static int debug;
	41
	42	void usb_wwan_dtr_rts(struct usb_serial_port *port, int on)
	43	{
	44	struct usb_serial *serial = port->serial;
	45	struct usb_wwan_port_private *portdata;
	46
	47	struct usb_wwan_intf_private *intfdata;
	48
	49	dbg("%s", __func__);
	50
	51	intfdata = port->serial->private;
	52
	53	if (!intfdata->send_setup)
	54	return;
	55
	56	portdata = usb_get_serial_port_data(port);
	57	mutex_lock(&serial->disc_mutex);
	58	portdata->rts_state = on;
	59	portdata->dtr_state = on;
	60	if (serial->dev)
	61	intfdata->send_setup(port);
	62	mutex_unlock(&serial->disc_mutex);
	63	}
	64	EXPORT_SYMBOL(usb_wwan_dtr_rts);
	65
	66	void usb_wwan_set_termios(struct tty_struct *tty,
	67	struct usb_serial_port *port,
	68	struct ktermios *old_termios)
	69	{
	70	struct usb_wwan_intf_private *intfdata = port->serial->private;
	71
	72	dbg("%s", __func__);
	73
	74	/* Doesn't support option setting */
	75	tty_termios_copy_hw(tty->termios, old_termios);
	76
	77	if (intfdata->send_setup)
	78	intfdata->send_setup(port);
	79	}
	80	EXPORT_SYMBOL(usb_wwan_set_termios);
	81
	82	int usb_wwan_tiocmget(struct tty_struct tty, struct file file)
	83	{
	84	struct usb_serial_port *port = tty->driver_data;
	85	unsigned int value;
	86	struct usb_wwan_port_private *portdata;
	87
	88	portdata = usb_get_serial_port_data(port);
	89
	90	value = ((portdata->rts_state) ? TIOCM_RTS : 0) \|
	91	((portdata->dtr_state) ? TIOCM_DTR : 0) \|
	92	((portdata->cts_state) ? TIOCM_CTS : 0) \|
	93	((portdata->dsr_state) ? TIOCM_DSR : 0) \|
	94	((portdata->dcd_state) ? TIOCM_CAR : 0) \|
	95	((portdata->ri_state) ? TIOCM_RNG : 0);
	96
	97	return value;
	98	}
	99	EXPORT_SYMBOL(usb_wwan_tiocmget);
	100
	101	int usb_wwan_tiocmset(struct tty_struct tty, struct file file,
102	unsigned int set, unsigned int clear)
103	{
104	struct usb_serial_port *port = tty->driver_data;
105	struct usb_wwan_port_private *portdata;
106	struct usb_wwan_intf_private *intfdata;
107
108	portdata = usb_get_serial_port_data(port);
109	intfdata = port->serial->private;
110
111	if (!intfdata->send_setup)
112	return -EINVAL;
113
114	/* FIXME: what locks portdata fields ? */
115	if (set & TIOCM_RTS)
116	portdata->rts_state = 1;
117	if (set & TIOCM_DTR)
118	portdata->dtr_state = 1;
119
120	if (clear & TIOCM_RTS)
121	portdata->rts_state = 0;
122	if (clear & TIOCM_DTR)
123	portdata->dtr_state = 0;
124	return intfdata->send_setup(port);
125	}
126	EXPORT_SYMBOL(usb_wwan_tiocmset);
127
02303f73 DW	128	static int get_serial_info(struct usb_serial_port *port,
	129	struct serial_struct __user *retinfo)
	130	{
	131	struct serial_struct tmp;
	132
	133	if (!retinfo)
	134	return -EFAULT;
	135
	136	memset(&tmp, 0, sizeof(tmp));
	137	tmp.line = port->serial->minor;
	138	tmp.port = port->number;
	139	tmp.baud_base = tty_get_baud_rate(port->port.tty);
	140	tmp.close_delay = port->port.close_delay / 10;
	141	tmp.closing_wait = port->port.closing_wait == ASYNC_CLOSING_WAIT_NONE ?
	142	ASYNC_CLOSING_WAIT_NONE :
	143	port->port.closing_wait / 10;
	144
	145	if (copy_to_user(retinfo, &tmp, sizeof(*retinfo)))
	146	return -EFAULT;
	147	return 0;
	148	}
	149
	150	static int set_serial_info(struct usb_serial_port *port,
	151	struct serial_struct __user *newinfo)
	152	{
	153	struct serial_struct new_serial;
	154	unsigned int closing_wait, close_delay;
	155	int retval = 0;
	156
	157	if (copy_from_user(&new_serial, newinfo, sizeof(new_serial)))
	158	return -EFAULT;
	159
	160	close_delay = new_serial.close_delay * 10;
	161	closing_wait = new_serial.closing_wait == ASYNC_CLOSING_WAIT_NONE ?
	162	ASYNC_CLOSING_WAIT_NONE : new_serial.closing_wait * 10;
	163
	164	mutex_lock(&port->port.mutex);
	165
	166	if (!capable(CAP_SYS_ADMIN)) {
	167	if ((close_delay != port->port.close_delay) \|\|
	168	(closing_wait != port->port.closing_wait))
	169	retval = -EPERM;
	170	else
	171	retval = -EOPNOTSUPP;
	172	} else {
	173	port->port.close_delay = close_delay;
	174	port->port.closing_wait = closing_wait;
	175	}
	176
	177	mutex_unlock(&port->port.mutex);
	178	return retval;
	179	}
	180
	181	int usb_wwan_ioctl(struct tty_struct tty, struct file file,
	182	unsigned int cmd, unsigned long arg)
	183	{
	184	struct usb_serial_port *port = tty->driver_data;
	185
	186	dbg("%s cmd 0x%04x", __func__, cmd);
	187
	188	switch (cmd) {
	189	case TIOCGSERIAL:
	190	return get_serial_info(port,
	191	(struct serial_struct __user *) arg);
192	case TIOCSSERIAL:
193	return set_serial_info(port,
194	(struct serial_struct __user *) arg);
195	default:
196	break;
197	}
198
199	dbg("%s arg not supported", __func__);
200
201	return -ENOIOCTLCMD;
202	}
203	EXPORT_SYMBOL(usb_wwan_ioctl);
204
0d456194 MG	205	/* Write */
	206	int usb_wwan_write(struct tty_struct tty, struct usb_serial_port port,
	207	const unsigned char *buf, int count)
	208	{
	209	struct usb_wwan_port_private *portdata;
	210	struct usb_wwan_intf_private *intfdata;
	211	int i;
	212	int left, todo;
	213	struct urb this_urb = NULL; / spurious */
	214	int err;
	215	unsigned long flags;
	216
	217	portdata = usb_get_serial_port_data(port);
	218	intfdata = port->serial->private;
	219
	220	dbg("%s: write (%d chars)", __func__, count);
	221
	222	i = 0;
	223	left = count;
	224	for (i = 0; left > 0 && i < N_OUT_URB; i++) {
	225	todo = left;
	226	if (todo > OUT_BUFLEN)
	227	todo = OUT_BUFLEN;
	228
	229	this_urb = portdata->out_urbs[i];
	230	if (test_and_set_bit(i, &portdata->out_busy)) {
	231	if (time_before(jiffies,
	232	portdata->tx_start_time[i] + 10 * HZ))
	233	continue;
	234	usb_unlink_urb(this_urb);
	235	continue;
	236	}
	237	dbg("%s: endpoint %d buf %d", __func__,
	238	usb_pipeendpoint(this_urb->pipe), i);
	239
	240	err = usb_autopm_get_interface_async(port->serial->interface);
	241	if (err < 0)
	242	break;
	243
	244	/* send the data */
	245	memcpy(this_urb->transfer_buffer, buf, todo);
	246	this_urb->transfer_buffer_length = todo;
	247
	248	spin_lock_irqsave(&intfdata->susp_lock, flags);
	249	if (intfdata->suspended) {
	250	usb_anchor_urb(this_urb, &portdata->delayed);
	251	spin_unlock_irqrestore(&intfdata->susp_lock, flags);
	252	} else {
	253	intfdata->in_flight++;
	254	spin_unlock_irqrestore(&intfdata->susp_lock, flags);
	255	err = usb_submit_urb(this_urb, GFP_ATOMIC);
	256	if (err) {
	257	dbg("usb_submit_urb %p (write bulk) failed "
	258	"(%d)", this_urb, err);
	259	clear_bit(i, &portdata->out_busy);
	260	spin_lock_irqsave(&intfdata->susp_lock, flags);
	261	intfdata->in_flight--;
	262	spin_unlock_irqrestore(&intfdata->susp_lock,
	263	flags);
3d06bf15	264	usb_autopm_put_interface_async(port->serial->interface);
433508ae	265	break;
0d456194 MG	266	}
	267	}
	268
	269	portdata->tx_start_time[i] = jiffies;
	270	buf += todo;
	271	left -= todo;
	272	}
	273
	274	count -= left;
	275	dbg("%s: wrote (did %d)", __func__, count);
	276	return count;
	277	}
	278	EXPORT_SYMBOL(usb_wwan_write);
	279
	280	static void usb_wwan_indat_callback(struct urb *urb)
	281	{
	282	int err;
	283	int endpoint;
	284	struct usb_serial_port *port;
	285	struct tty_struct *tty;
	286	unsigned char *data = urb->transfer_buffer;
	287	int status = urb->status;
	288
	289	dbg("%s: %p", __func__, urb);
	290
	291	endpoint = usb_pipeendpoint(urb->pipe);
	292	port = urb->context;
	293
	294	if (status) {
	295	dbg("%s: nonzero status: %d on endpoint %02x.",
	296	__func__, status, endpoint);
	297	} else {
	298	tty = tty_port_tty_get(&port->port);
	299	if (urb->actual_length) {
	300	tty_insert_flip_string(tty, data, urb->actual_length);
	301	tty_flip_buffer_push(tty);
	302	} else
	303	dbg("%s: empty read urb received", __func__);
	304	tty_kref_put(tty);
	305
	306	/* Resubmit urb so we continue receiving */
	307	if (status != -ESHUTDOWN) {
	308	err = usb_submit_urb(urb, GFP_ATOMIC);
c9c4558f ON	309	if (err) {
	310	if (err != -EPERM) {
	311	printk(KERN_ERR "%s: resubmit read urb failed. "
	312	"(%d)", __func__, err);
	313	/* busy also in error unless we are killed */
	314	usb_mark_last_busy(port->serial->dev);
	315	}
	316	} else {
0d456194	317	usb_mark_last_busy(port->serial->dev);
c9c4558f	318	}
0d456194 MG	319	}
	320
	321	}
0d456194 MG	322	}
	323
	324	static void usb_wwan_outdat_callback(struct urb *urb)
	325	{
	326	struct usb_serial_port *port;
	327	struct usb_wwan_port_private *portdata;
	328	struct usb_wwan_intf_private *intfdata;
	329	int i;
	330
	331	dbg("%s", __func__);
	332
	333	port = urb->context;
	334	intfdata = port->serial->private;
	335
	336	usb_serial_port_softint(port);
	337	usb_autopm_put_interface_async(port->serial->interface);
	338	portdata = usb_get_serial_port_data(port);
	339	spin_lock(&intfdata->susp_lock);
	340	intfdata->in_flight--;
	341	spin_unlock(&intfdata->susp_lock);
	342
	343	for (i = 0; i < N_OUT_URB; ++i) {
	344	if (portdata->out_urbs[i] == urb) {
	345	smp_mb__before_clear_bit();
	346	clear_bit(i, &portdata->out_busy);
	347	break;
	348	}
	349	}
	350	}
	351
	352	int usb_wwan_write_room(struct tty_struct *tty)
	353	{
	354	struct usb_serial_port *port = tty->driver_data;
	355	struct usb_wwan_port_private *portdata;
	356	int i;
	357	int data_len = 0;
	358	struct urb *this_urb;
	359
	360	portdata = usb_get_serial_port_data(port);
	361
	362	for (i = 0; i < N_OUT_URB; i++) {
	363	this_urb = portdata->out_urbs[i];
	364	if (this_urb && !test_bit(i, &portdata->out_busy))
	365	data_len += OUT_BUFLEN;
	366	}
	367
	368	dbg("%s: %d", __func__, data_len);
	369	return data_len;
	370	}
	371	EXPORT_SYMBOL(usb_wwan_write_room);
	372
	373	int usb_wwan_chars_in_buffer(struct tty_struct *tty)
	374	{
	375	struct usb_serial_port *port = tty->driver_data;
	376	struct usb_wwan_port_private *portdata;
	377	int i;
	378	int data_len = 0;
	379	struct urb *this_urb;
	380
	381	portdata = usb_get_serial_port_data(port);
	382
	383	for (i = 0; i < N_OUT_URB; i++) {
	384	this_urb = portdata->out_urbs[i];
	385	/* FIXME: This locking is insufficient as this_urb may
386	go unused during the test */
387	if (this_urb && test_bit(i, &portdata->out_busy))
388	data_len += this_urb->transfer_buffer_length;
389	}
390	dbg("%s: %d", __func__, data_len);
391	return data_len;
392	}
393	EXPORT_SYMBOL(usb_wwan_chars_in_buffer);
394
395	int usb_wwan_open(struct tty_struct tty, struct usb_serial_port port)
396	{
397	struct usb_wwan_port_private *portdata;
398	struct usb_wwan_intf_private *intfdata;
399	struct usb_serial *serial = port->serial;
400	int i, err;
401	struct urb *urb;
402
403	portdata = usb_get_serial_port_data(port);
404	intfdata = serial->private;
405
406	dbg("%s", __func__);
407
408	/* Start reading from the IN endpoint */
409	for (i = 0; i < N_IN_URB; i++) {
410	urb = portdata->in_urbs[i];
411	if (!urb)
412	continue;
413	err = usb_submit_urb(urb, GFP_KERNEL);
414	if (err) {
415	dbg("%s: submit urb %d failed (%d) %d",
416	__func__, i, err, urb->transfer_buffer_length);
417	}
418	}
419
420	if (intfdata->send_setup)
421	intfdata->send_setup(port);
422
423	serial->interface->needs_remote_wakeup = 1;
424	spin_lock_irq(&intfdata->susp_lock);
425	portdata->opened = 1;
426	spin_unlock_irq(&intfdata->susp_lock);
427	usb_autopm_put_interface(serial->interface);
428
429	return 0;
430	}
431	EXPORT_SYMBOL(usb_wwan_open);
432
433	void usb_wwan_close(struct usb_serial_port *port)
434	{
435	int i;
436	struct usb_serial *serial = port->serial;
437	struct usb_wwan_port_private *portdata;
438	struct usb_wwan_intf_private *intfdata = port->serial->private;
439
440	dbg("%s", __func__);
441	portdata = usb_get_serial_port_data(port);
442
443	if (serial->dev) {
444	/* Stop reading/writing urbs */
445	spin_lock_irq(&intfdata->susp_lock);
446	portdata->opened = 0;
447	spin_unlock_irq(&intfdata->susp_lock);
448
449	for (i = 0; i < N_IN_URB; i++)
450	usb_kill_urb(portdata->in_urbs[i]);
451	for (i = 0; i < N_OUT_URB; i++)
452	usb_kill_urb(portdata->out_urbs[i]);
453	usb_autopm_get_interface(serial->interface);
454	serial->interface->needs_remote_wakeup = 0;
455	}
456	}
457	EXPORT_SYMBOL(usb_wwan_close);
458
459	/* Helper functions used by usb_wwan_setup_urbs */
460	static struct urb usb_wwan_setup_urb(struct usb_serial serial, int endpoint,
461	int dir, void ctx, char buf, int len,
462	void (callback) (struct urb ))
463	{
464	struct urb *urb;
465
466	if (endpoint == -1)
467	return NULL; /* endpoint not needed */
468
469	urb = usb_alloc_urb(0, GFP_KERNEL); /* No ISO */
470	if (urb == NULL) {
471	dbg("%s: alloc for endpoint %d failed.", __func__, endpoint);
472	return NULL;
473	}
474
475	/* Fill URB using supplied data. */
476	usb_fill_bulk_urb(urb, serial->dev,
477	usb_sndbulkpipe(serial->dev, endpoint) \| dir,
478	buf, len, callback, ctx);
479
480	return urb;
481	}
482
483	/* Setup urbs */
484	static void usb_wwan_setup_urbs(struct usb_serial *serial)
485	{
486	int i, j;
487	struct usb_serial_port *port;
488	struct usb_wwan_port_private *portdata;
489
490	dbg("%s", __func__);
491
492	for (i = 0; i < serial->num_ports; i++) {
493	port = serial->port[i];
494	portdata = usb_get_serial_port_data(port);
495
496	/* Do indat endpoints first */
497	for (j = 0; j < N_IN_URB; ++j) {
498	portdata->in_urbs[j] = usb_wwan_setup_urb(serial,
499	port->
500	bulk_in_endpointAddress,
501	USB_DIR_IN,
502	port,
503	portdata->
504	in_buffer[j],
505	IN_BUFLEN,
506	usb_wwan_indat_callback);
507	}
508
509	/* outdat endpoints */
510	for (j = 0; j < N_OUT_URB; ++j) {
511	portdata->out_urbs[j] = usb_wwan_setup_urb(serial,
512	port->
513	bulk_out_endpointAddress,
514	USB_DIR_OUT,
515	port,
516	portdata->
517	out_buffer
518	[j],
519	OUT_BUFLEN,
520	usb_wwan_outdat_callback);
521	}
522	}
523	}
524
525	int usb_wwan_startup(struct usb_serial *serial)
526	{
527	int i, j, err;
528	struct usb_serial_port *port;
529	struct usb_wwan_port_private *portdata;
530	u8 *buffer;
531
532	dbg("%s", __func__);
533
534	/* Now setup per port private data */
535	for (i = 0; i < serial->num_ports; i++) {
536	port = serial->port[i];
537	portdata = kzalloc(sizeof(*portdata), GFP_KERNEL);
538	if (!portdata) {
539	dbg("%s: kmalloc for usb_wwan_port_private (%d) failed!.",
540	__func__, i);
541	return 1;
542	}
543	init_usb_anchor(&portdata->delayed);
544
545	for (j = 0; j < N_IN_URB; j++) {
546	buffer = (u8 *) __get_free_page(GFP_KERNEL);
547	if (!buffer)
548	goto bail_out_error;
549	portdata->in_buffer[j] = buffer;
550	}
551
552	for (j = 0; j < N_OUT_URB; j++) {
553	buffer = kmalloc(OUT_BUFLEN, GFP_KERNEL);
554	if (!buffer)
555	goto bail_out_error2;
556	portdata->out_buffer[j] = buffer;
557	}
558
559	usb_set_serial_port_data(port, portdata);
560
561	if (!port->interrupt_in_urb)
562	continue;
563	err = usb_submit_urb(port->interrupt_in_urb, GFP_KERNEL);
564	if (err)
565	dbg("%s: submit irq_in urb failed %d", __func__, err);
566	}
567	usb_wwan_setup_urbs(serial);
568	return 0;
569
570	bail_out_error2:
571	for (j = 0; j < N_OUT_URB; j++)
572	kfree(portdata->out_buffer[j]);
573	bail_out_error:
574	for (j = 0; j < N_IN_URB; j++)
575	if (portdata->in_buffer[j])
576	free_page((unsigned long)portdata->in_buffer[j]);
577	kfree(portdata);
578	return 1;
579	}
580	EXPORT_SYMBOL(usb_wwan_startup);
581
582	static void stop_read_write_urbs(struct usb_serial *serial)
583	{
584	int i, j;
585	struct usb_serial_port *port;
586	struct usb_wwan_port_private *portdata;
587
588	/* Stop reading/writing urbs */
589	for (i = 0; i < serial->num_ports; ++i) {
590	port = serial->port[i];
591	portdata = usb_get_serial_port_data(port);
592	for (j = 0; j < N_IN_URB; j++)
593	usb_kill_urb(portdata->in_urbs[j]);
594	for (j = 0; j < N_OUT_URB; j++)
595	usb_kill_urb(portdata->out_urbs[j]);
596	}
597	}
598
599	void usb_wwan_disconnect(struct usb_serial *serial)
600	{
601	dbg("%s", __func__);
602
603	stop_read_write_urbs(serial);
604	}
605	EXPORT_SYMBOL(usb_wwan_disconnect);
606
607	void usb_wwan_release(struct usb_serial *serial)
608	{
609	int i, j;
610	struct usb_serial_port *port;
611	struct usb_wwan_port_private *portdata;
612
613	dbg("%s", __func__);
614
615	/* Now free them */
616	for (i = 0; i < serial->num_ports; ++i) {
617	port = serial->port[i];
618	portdata = usb_get_serial_port_data(port);
619
620	for (j = 0; j < N_IN_URB; j++) {
621	usb_free_urb(portdata->in_urbs[j]);
622	free_page((unsigned long)
623	portdata->in_buffer[j]);
624	portdata->in_urbs[j] = NULL;
625	}
626	for (j = 0; j < N_OUT_URB; j++) {
627	usb_free_urb(portdata->out_urbs[j]);
628	kfree(portdata->out_buffer[j]);
629	portdata->out_urbs[j] = NULL;
630	}
631	}
632
633	/* Now free per port private data */
634	for (i = 0; i < serial->num_ports; i++) {
635	port = serial->port[i];
636	kfree(usb_get_serial_port_data(port));
637	}
638	}
639	EXPORT_SYMBOL(usb_wwan_release);
640
641	#ifdef CONFIG_PM
642	int usb_wwan_suspend(struct usb_serial *serial, pm_message_t message)
643	{
644	struct usb_wwan_intf_private *intfdata = serial->private;
645	int b;
646
647	dbg("%s entered", __func__);
648
649	if (message.event & PM_EVENT_AUTO) {
650	spin_lock_irq(&intfdata->susp_lock);
651	b = intfdata->in_flight;
652	spin_unlock_irq(&intfdata->susp_lock);
653
654	if (b)
655	return -EBUSY;
656	}
657
658	spin_lock_irq(&intfdata->susp_lock);
659	intfdata->suspended = 1;
660	spin_unlock_irq(&intfdata->susp_lock);
661	stop_read_write_urbs(serial);
662
663	return 0;
664	}
665	EXPORT_SYMBOL(usb_wwan_suspend);
666
667	static void play_delayed(struct usb_serial_port *port)
668	{
669	struct usb_wwan_intf_private *data;
670	struct usb_wwan_port_private *portdata;
671	struct urb *urb;
672	int err;
673
674	portdata = usb_get_serial_port_data(port);
675	data = port->serial->private;
676	while ((urb = usb_get_from_anchor(&portdata->delayed))) {
677	err = usb_submit_urb(urb, GFP_ATOMIC);
678	if (!err)
679	data->in_flight++;
680	}
681	}
682
683	int usb_wwan_resume(struct usb_serial *serial)
684	{
685	int i, j;
686	struct usb_serial_port *port;
687	struct usb_wwan_intf_private *intfdata = serial->private;
688	struct usb_wwan_port_private *portdata;
689	struct urb *urb;
690	int err = 0;
691
692	dbg("%s entered", __func__);
693	/* get the interrupt URBs resubmitted unconditionally */
694	for (i = 0; i < serial->num_ports; i++) {
695	port = serial->port[i];
696	if (!port->interrupt_in_urb) {
697	dbg("%s: No interrupt URB for port %d", __func__, i);
698	continue;
699	}
700	err = usb_submit_urb(port->interrupt_in_urb, GFP_NOIO);
701	dbg("Submitted interrupt URB for port %d (result %d)", i, err);
702	if (err < 0) {
703	err("%s: Error %d for interrupt URB of port%d",
704	__func__, err, i);
705	goto err_out;
706	}
707	}
708
709	for (i = 0; i < serial->num_ports; i++) {
710	/* walk all ports */
711	port = serial->port[i];
712	portdata = usb_get_serial_port_data(port);
713
714	/* skip closed ports */
715	spin_lock_irq(&intfdata->susp_lock);
716	if (!portdata->opened) {
717	spin_unlock_irq(&intfdata->susp_lock);
718	continue;
719	}
720
721	for (j = 0; j < N_IN_URB; j++) {
722	urb = portdata->in_urbs[j];
723	err = usb_submit_urb(urb, GFP_ATOMIC);
724	if (err < 0) {
725	err("%s: Error %d for bulk URB %d",
726	__func__, err, i);
727	spin_unlock_irq(&intfdata->susp_lock);
728	goto err_out;
729	}
730	}
731	play_delayed(port);
732	spin_unlock_irq(&intfdata->susp_lock);
733	}
734	spin_lock_irq(&intfdata->susp_lock);
735	intfdata->suspended = 0;
736	spin_unlock_irq(&intfdata->susp_lock);
737	err_out:
738	return err;
739	}
740	EXPORT_SYMBOL(usb_wwan_resume);
741	#endif
742
743	MODULE_AUTHOR(DRIVER_AUTHOR);
744	MODULE_DESCRIPTION(DRIVER_DESC);
745	MODULE_VERSION(DRIVER_VERSION);
746	MODULE_LICENSE("GPL");
747
748	module_param(debug, bool, S_IRUGO \| S_IWUSR);
749	MODULE_PARM_DESC(debug, "Debug messages");