Skip to content
Snippets Groups Projects
Select Git revision
  • 032129cb03df196c4216a82295e6555539da4ce7
  • vme-testing default
  • ci-test
  • master
  • remoteproc
  • am625-sk-ov5640
  • pcal6534-upstreaming
  • lps22df-upstreaming
  • msc-upstreaming
  • imx8mp
  • iio/noa1305
  • vme-next
  • vme-next-4.14-rc4
  • v4.14-rc4
  • v4.14-rc3
  • v4.14-rc2
  • v4.14-rc1
  • v4.13
  • vme-next-4.13-rc7
  • v4.13-rc7
  • v4.13-rc6
  • v4.13-rc5
  • v4.13-rc4
  • v4.13-rc3
  • v4.13-rc2
  • v4.13-rc1
  • v4.12
  • v4.12-rc7
  • v4.12-rc6
  • v4.12-rc5
  • v4.12-rc4
  • v4.12-rc3
32 results

usb_wwan.c

Blame
  • usb_wwan.c 18.31 KiB
    /*
      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 bool 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;
    
    	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;
    
    	/* 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 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 = 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,
    		   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;
    
    	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 (tty) {
    			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 */
    		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;
    
    	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;
    
    	/* 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);
    	/* this balances a get in the generic USB serial code */
    	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;
    
    	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]);
    		/* balancing - important as an error cannot be handled*/
    		usb_autopm_get_interface_no_resume(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;
    
    	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;
    
    	/* 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);
    
    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);
    
    	/* Stop reading/writing urbs and free them */
    	for (i = 0; i < N_IN_URB; i++) {
    		usb_kill_urb(portdata->in_urbs[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_kill_urb(portdata->out_urbs[i]);
    		usb_free_urb(portdata->out_urbs[i]);
    		kfree(portdata->out_buffer[i]);
    	}
    
    	/* Now free port private data */
    	kfree(portdata);
    	return 0;
    }
    EXPORT_SYMBOL(usb_wwan_port_remove);
    
    #ifdef CONFIG_PM
    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);
    		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]);
    	}
    }
    
    int usb_wwan_suspend(struct usb_serial *serial, pm_message_t message)
    {
    	struct usb_wwan_intf_private *intfdata = serial->private;
    	int b;
    
    	if (PMSG_IS_AUTO(message)) {
    		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 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;
    		}
    	}
    }
    
    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++;
    		} else {
    			/* we have to throw away the rest */
    			do {
    				unbusy_queued_urb(urb, portdata);
    				usb_autopm_put_interface_no_suspend(port->serial->interface);
    			} while ((urb = usb_get_from_anchor(&portdata->delayed)));
    			break;
    		}
    	}
    }
    
    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;
    
    	/* 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) {
    			dev_err(&port->dev, "%s: Error %d for interrupt URB\n",
    				__func__, err);
    			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 || !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) {
    				dev_err(&port->dev, "%s: Error %d for bulk URB %d\n",
    					__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");