drivers/usb/serial/usb_wwan.c

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