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 = usb_get_serial_data(port->serial);
  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 = usb_get_serial_data(port->serial);
  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 int usb_wwan_write(struct tty_struct *tty, struct usb_serial_port *port,
 182                    const unsigned char *buf, int count)
 183 {
 184         struct usb_wwan_port_private *portdata;
 185         struct usb_wwan_intf_private *intfdata;
 186         int i;
 187         int left, todo;
 188         struct urb *this_urb = NULL;    /* spurious */
 189         int err;
 190         unsigned long flags;
 191
 192         portdata = usb_get_serial_port_data(port);
 193         intfdata = usb_get_serial_data(port->serial);
 194
 195         dev_dbg(&port->dev, "%s: write (%d chars)\n", __func__, count);
 196
 197         i = 0;
 198         left = count;
 199         for (i = 0; left > 0 && i < N_OUT_URB; i++) {
 200                 todo = left;
 201                 if (todo > OUT_BUFLEN)
 202                         todo = OUT_BUFLEN;
 203
 204                 this_urb = portdata->out_urbs[i];
 205                 if (test_and_set_bit(i, &portdata->out_busy)) {
 206                         if (time_before(jiffies,
 207                                         portdata->tx_start_time[i] + 10 * HZ))
 208                                 continue;
 209                         usb_unlink_urb(this_urb);
 210                         continue;
 211                 }
 212                 dev_dbg(&port->dev, "%s: endpoint %d buf %d\n", __func__,
 213                         usb_pipeendpoint(this_urb->pipe), i);
 214
 215                 err = usb_autopm_get_interface_async(port->serial->interface);
 216                 if (err < 0) {
 217                         clear_bit(i, &portdata->out_busy);
 218                         break;
 219                 }
 220
 221                 /* send the data */
 222                 memcpy(this_urb->transfer_buffer, buf, todo);
 223                 this_urb->transfer_buffer_length = todo;
 224
 225                 spin_lock_irqsave(&intfdata->susp_lock, flags);
 226                 if (intfdata->suspended) {
 227                         usb_anchor_urb(this_urb, &portdata->delayed);
 228                         spin_unlock_irqrestore(&intfdata->susp_lock, flags);
 229                 } else {
 230                         intfdata->in_flight++;
 231                         spin_unlock_irqrestore(&intfdata->susp_lock, flags);
 232                         err = usb_submit_urb(this_urb, GFP_ATOMIC);
 233                         if (err) {
 234                                 dev_err(&port->dev,
 235                                         "%s: submit urb %d failed: %d\n",
 236                                         __func__, i, err);
 237                                 clear_bit(i, &portdata->out_busy);
 238                                 spin_lock_irqsave(&intfdata->susp_lock, flags);
 239                                 intfdata->in_flight--;
 240                                 spin_unlock_irqrestore(&intfdata->susp_lock,
 241                                                        flags);
 242                                 usb_autopm_put_interface_async(port->serial->interface);
 243                                 break;
 244                         }
 245                 }
 246
 247                 portdata->tx_start_time[i] = jiffies;
 248                 buf += todo;
 249                 left -= todo;
 250         }
 251
 252         count -= left;
 253         dev_dbg(&port->dev, "%s: wrote (did %d)\n", __func__, count);
 254         return count;
 255 }
 256 EXPORT_SYMBOL(usb_wwan_write);
 257
 258 static void usb_wwan_indat_callback(struct urb *urb)
 259 {
 260         int err;
 261         int endpoint;
 262         struct usb_serial_port *port;
 263         struct device *dev;
 264         unsigned char *data = urb->transfer_buffer;
 265         int status = urb->status;
 266
 267         endpoint = usb_pipeendpoint(urb->pipe);
 268         port = urb->context;
 269         dev = &port->dev;
 270
 271         if (status) {
 272                 dev_dbg(dev, "%s: nonzero status: %d on endpoint %02x.\n",
 273                         __func__, status, endpoint);
 274         } else {
 275                 if (urb->actual_length) {
 276                         tty_insert_flip_string(&port->port, data,
 277                                         urb->actual_length);
 278                         tty_flip_buffer_push(&port->port);
 279                 } else
 280                         dev_dbg(dev, "%s: empty read urb received\n", __func__);
 281         }
 282         /* Resubmit urb so we continue receiving */
 283         err = usb_submit_urb(urb, GFP_ATOMIC);
 284         if (err) {
 285                 if (err != -EPERM) {
 286                         dev_err(dev, "%s: resubmit read urb failed. (%d)\n",
 287                                 __func__, err);
 288                         /* busy also in error unless we are killed */
 289                         usb_mark_last_busy(port->serial->dev);
 290                 }
 291         } else {
 292                 usb_mark_last_busy(port->serial->dev);
 293         }
 294 }
 295
 296 static void usb_wwan_outdat_callback(struct urb *urb)
 297 {
 298         struct usb_serial_port *port;
 299         struct usb_wwan_port_private *portdata;
 300         struct usb_wwan_intf_private *intfdata;
 301         int i;
 302
 303         port = urb->context;
 304         intfdata = usb_get_serial_data(port->serial);
 305
 306         usb_serial_port_softint(port);
 307         usb_autopm_put_interface_async(port->serial->interface);
 308         portdata = usb_get_serial_port_data(port);
 309         spin_lock(&intfdata->susp_lock);
 310         intfdata->in_flight--;
 311         spin_unlock(&intfdata->susp_lock);
 312
 313         for (i = 0; i < N_OUT_URB; ++i) {
 314                 if (portdata->out_urbs[i] == urb) {
 315                         smp_mb__before_atomic();
 316                         clear_bit(i, &portdata->out_busy);
 317                         break;
 318                 }
 319         }
 320 }
 321
 322 int usb_wwan_write_room(struct tty_struct *tty)
 323 {
 324         struct usb_serial_port *port = tty->driver_data;
 325         struct usb_wwan_port_private *portdata;
 326         int i;
 327         int data_len = 0;
 328         struct urb *this_urb;
 329
 330         portdata = usb_get_serial_port_data(port);
 331
 332         for (i = 0; i < N_OUT_URB; i++) {
 333                 this_urb = portdata->out_urbs[i];
 334                 if (this_urb && !test_bit(i, &portdata->out_busy))
 335                         data_len += OUT_BUFLEN;
 336         }
 337
 338         dev_dbg(&port->dev, "%s: %d\n", __func__, data_len);
 339         return data_len;
 340 }
 341 EXPORT_SYMBOL(usb_wwan_write_room);
 342
 343 int usb_wwan_chars_in_buffer(struct tty_struct *tty)
 344 {
 345         struct usb_serial_port *port = tty->driver_data;
 346         struct usb_wwan_port_private *portdata;
 347         int i;
 348         int data_len = 0;
 349         struct urb *this_urb;
 350
 351         portdata = usb_get_serial_port_data(port);
 352
 353         for (i = 0; i < N_OUT_URB; i++) {
 354                 this_urb = portdata->out_urbs[i];
 355                 /* FIXME: This locking is insufficient as this_urb may
 356                    go unused during the test */
 357                 if (this_urb && test_bit(i, &portdata->out_busy))
 358                         data_len += this_urb->transfer_buffer_length;
 359         }
 360         dev_dbg(&port->dev, "%s: %d\n", __func__, data_len);
 361         return data_len;
 362 }
 363 EXPORT_SYMBOL(usb_wwan_chars_in_buffer);
 364
 365 int usb_wwan_open(struct tty_struct *tty, struct usb_serial_port *port)
 366 {
 367         struct usb_wwan_port_private *portdata;
 368         struct usb_wwan_intf_private *intfdata;
 369         struct usb_serial *serial = port->serial;
 370         int i, err;
 371         struct urb *urb;
 372
 373         portdata = usb_get_serial_port_data(port);
 374         intfdata = usb_get_serial_data(serial);
 375
 376         if (port->interrupt_in_urb) {
 377                 err = usb_submit_urb(port->interrupt_in_urb, GFP_KERNEL);
 378                 if (err) {
 379                         dev_err(&port->dev, "%s: submit int urb failed: %d\n",
 380                                 __func__, err);
 381                 }
 382         }
 383
 384         /* Start reading from the IN endpoint */
 385         for (i = 0; i < N_IN_URB; i++) {
 386                 urb = portdata->in_urbs[i];
 387                 if (!urb)
 388                         continue;
 389                 err = usb_submit_urb(urb, GFP_KERNEL);
 390                 if (err) {
 391                         dev_err(&port->dev,
 392                                 "%s: submit read urb %d failed: %d\n",
 393                                 __func__, i, err);
 394                 }
 395         }
 396
 397         spin_lock_irq(&intfdata->susp_lock);
 398         if (++intfdata->open_ports == 1)
 399                 serial->interface->needs_remote_wakeup = 1;
 400         spin_unlock_irq(&intfdata->susp_lock);
 401         /* this balances a get in the generic USB serial code */
 402         usb_autopm_put_interface(serial->interface);
 403
 404         return 0;
 405 }
 406 EXPORT_SYMBOL(usb_wwan_open);
 407
 408 static void unbusy_queued_urb(struct urb *urb,
 409                                         struct usb_wwan_port_private *portdata)
 410 {
 411         int i;
 412
 413         for (i = 0; i < N_OUT_URB; i++) {
 414                 if (urb == portdata->out_urbs[i]) {
 415                         clear_bit(i, &portdata->out_busy);
 416                         break;
 417                 }
 418         }
 419 }
 420
 421 void usb_wwan_close(struct usb_serial_port *port)
 422 {
 423         int i;
 424         struct usb_serial *serial = port->serial;
 425         struct usb_wwan_port_private *portdata;
 426         struct usb_wwan_intf_private *intfdata = usb_get_serial_data(serial);
 427         struct urb *urb;
 428
 429         portdata = usb_get_serial_port_data(port);
 430
 431         /*
 432          * Need to take susp_lock to make sure port is not already being
 433          * resumed, but no need to hold it due to ASYNC_INITIALIZED.
 434          */
 435         spin_lock_irq(&intfdata->susp_lock);
 436         if (--intfdata->open_ports == 0)
 437                 serial->interface->needs_remote_wakeup = 0;
 438         spin_unlock_irq(&intfdata->susp_lock);
 439
 440         for (;;) {
 441                 urb = usb_get_from_anchor(&portdata->delayed);
 442                 if (!urb)
 443                         break;
 444                 unbusy_queued_urb(urb, portdata);
 445                 usb_autopm_put_interface_async(serial->interface);
 446         }
 447
 448         for (i = 0; i < N_IN_URB; i++)
 449                 usb_kill_urb(portdata->in_urbs[i]);
 450         for (i = 0; i < N_OUT_URB; i++)
 451                 usb_kill_urb(portdata->out_urbs[i]);
 452         usb_kill_urb(port->interrupt_in_urb);
 453
 454         usb_autopm_get_interface_no_resume(serial->interface);
 455 }
 456 EXPORT_SYMBOL(usb_wwan_close);
 457
 458 static struct urb *usb_wwan_setup_urb(struct usb_serial_port *port,
 459                                       int endpoint,
 460                                       int dir, void *ctx, char *buf, int len,
 461                                       void (*callback) (struct urb *))
 462 {
 463         struct usb_serial *serial = port->serial;
 464         struct urb *urb;
 465
 466         urb = usb_alloc_urb(0, GFP_KERNEL);     /* No ISO */
 467         if (!urb)
 468                 return NULL;
 469
 470         usb_fill_bulk_urb(urb, serial->dev,
 471                           usb_sndbulkpipe(serial->dev, endpoint) | dir,
 472                           buf, len, callback, ctx);
 473
 474         return urb;
 475 }
 476
 477 int usb_wwan_port_probe(struct usb_serial_port *port)
 478 {
 479         struct usb_wwan_port_private *portdata;
 480         struct urb *urb;
 481         u8 *buffer;
 482         int i;
 483
 484         if (!port->bulk_in_size || !port->bulk_out_size)
 485                 return -ENODEV;
 486
 487         portdata = kzalloc(sizeof(*portdata), GFP_KERNEL);
 488         if (!portdata)
 489                 return -ENOMEM;
 490
 491         init_usb_anchor(&portdata->delayed);
 492
 493         for (i = 0; i < N_IN_URB; i++) {
 494                 buffer = (u8 *)__get_free_page(GFP_KERNEL);
 495                 if (!buffer)
 496                         goto bail_out_error;
 497                 portdata->in_buffer[i] = buffer;
 498
 499                 urb = usb_wwan_setup_urb(port, port->bulk_in_endpointAddress,
 500                                                 USB_DIR_IN, port,
 501                                                 buffer, IN_BUFLEN,
 502                                                 usb_wwan_indat_callback);
 503                 portdata->in_urbs[i] = urb;
 504         }
 505
 506         for (i = 0; i < N_OUT_URB; i++) {
 507                 buffer = kmalloc(OUT_BUFLEN, GFP_KERNEL);
 508                 if (!buffer)
 509                         goto bail_out_error2;
 510                 portdata->out_buffer[i] = buffer;
 511
 512                 urb = usb_wwan_setup_urb(port, port->bulk_out_endpointAddress,
 513                                                 USB_DIR_OUT, port,
 514                                                 buffer, OUT_BUFLEN,
 515                                                 usb_wwan_outdat_callback);
 516                 portdata->out_urbs[i] = urb;
 517         }
 518
 519         usb_set_serial_port_data(port, portdata);
 520
 521         return 0;
 522
 523 bail_out_error2:
 524         for (i = 0; i < N_OUT_URB; i++) {
 525                 usb_free_urb(portdata->out_urbs[i]);
 526                 kfree(portdata->out_buffer[i]);
 527         }
 528 bail_out_error:
 529         for (i = 0; i < N_IN_URB; i++) {
 530                 usb_free_urb(portdata->in_urbs[i]);
 531                 free_page((unsigned long)portdata->in_buffer[i]);
 532         }
 533         kfree(portdata);
 534
 535         return -ENOMEM;
 536 }
 537 EXPORT_SYMBOL_GPL(usb_wwan_port_probe);
 538
 539 int usb_wwan_port_remove(struct usb_serial_port *port)
 540 {
 541         int i;
 542         struct usb_wwan_port_private *portdata;
 543
 544         portdata = usb_get_serial_port_data(port);
 545         usb_set_serial_port_data(port, NULL);
 546
 547         for (i = 0; i < N_IN_URB; i++) {
 548                 usb_free_urb(portdata->in_urbs[i]);
 549                 free_page((unsigned long)portdata->in_buffer[i]);
 550         }
 551         for (i = 0; i < N_OUT_URB; i++) {
 552                 usb_free_urb(portdata->out_urbs[i]);
 553                 kfree(portdata->out_buffer[i]);
 554         }
 555
 556         kfree(portdata);
 557
 558         return 0;
 559 }
 560 EXPORT_SYMBOL(usb_wwan_port_remove);
 561
 562 #ifdef CONFIG_PM
 563 static void stop_urbs(struct usb_serial *serial)
 564 {
 565         int i, j;
 566         struct usb_serial_port *port;
 567         struct usb_wwan_port_private *portdata;
 568
 569         for (i = 0; i < serial->num_ports; ++i) {
 570                 port = serial->port[i];
 571                 portdata = usb_get_serial_port_data(port);
 572                 if (!portdata)
 573                         continue;
 574                 for (j = 0; j < N_IN_URB; j++)
 575                         usb_kill_urb(portdata->in_urbs[j]);
 576                 for (j = 0; j < N_OUT_URB; j++)
 577                         usb_kill_urb(portdata->out_urbs[j]);
 578                 usb_kill_urb(port->interrupt_in_urb);
 579         }
 580 }
 581
 582 int usb_wwan_suspend(struct usb_serial *serial, pm_message_t message)
 583 {
 584         struct usb_wwan_intf_private *intfdata = usb_get_serial_data(serial);
 585
 586         spin_lock_irq(&intfdata->susp_lock);
 587         if (PMSG_IS_AUTO(message)) {
 588                 if (intfdata->in_flight) {
 589                         spin_unlock_irq(&intfdata->susp_lock);
 590                         return -EBUSY;
 591                 }
 592         }
 593         intfdata->suspended = 1;
 594         spin_unlock_irq(&intfdata->susp_lock);
 595
 596         stop_urbs(serial);
 597
 598         return 0;
 599 }
 600 EXPORT_SYMBOL(usb_wwan_suspend);
 601
 602 /* Caller must hold susp_lock. */
 603 static int usb_wwan_submit_delayed_urbs(struct usb_serial_port *port)
 604 {
 605         struct usb_serial *serial = port->serial;
 606         struct usb_wwan_intf_private *data = usb_get_serial_data(serial);
 607         struct usb_wwan_port_private *portdata;
 608         struct urb *urb;
 609         int err_count = 0;
 610         int err;
 611
 612         portdata = usb_get_serial_port_data(port);
 613
 614         for (;;) {
 615                 urb = usb_get_from_anchor(&portdata->delayed);
 616                 if (!urb)
 617                         break;
 618
 619                 err = usb_submit_urb(urb, GFP_ATOMIC);
 620                 if (err) {
 621                         dev_err(&port->dev, "%s: submit urb failed: %d\n",
 622                                         __func__, err);
 623                         err_count++;
 624                         unbusy_queued_urb(urb, portdata);
 625                         usb_autopm_put_interface_async(serial->interface);
 626                         continue;
 627                 }
 628                 data->in_flight++;
 629         }
 630
 631         if (err_count)
 632                 return -EIO;
 633
 634         return 0;
 635 }
 636
 637 int usb_wwan_resume(struct usb_serial *serial)
 638 {
 639         int i, j;
 640         struct usb_serial_port *port;
 641         struct usb_wwan_intf_private *intfdata = usb_get_serial_data(serial);
 642         struct usb_wwan_port_private *portdata;
 643         struct urb *urb;
 644         int err;
 645         int err_count = 0;
 646
 647         spin_lock_irq(&intfdata->susp_lock);
 648         for (i = 0; i < serial->num_ports; i++) {
 649                 port = serial->port[i];
 650
 651                 if (!test_bit(ASYNCB_INITIALIZED, &port->port.flags))
 652                         continue;
 653
 654                 portdata = usb_get_serial_port_data(port);
 655
 656                 if (port->interrupt_in_urb) {
 657                         err = usb_submit_urb(port->interrupt_in_urb,
 658                                         GFP_ATOMIC);
 659                         if (err) {
 660                                 dev_err(&port->dev,
 661                                         "%s: submit int urb failed: %d\n",
 662                                         __func__, err);
 663                                 err_count++;
 664                         }
 665                 }
 666
 667                 err = usb_wwan_submit_delayed_urbs(port);
 668                 if (err)
 669                         err_count++;
 670
 671                 for (j = 0; j < N_IN_URB; j++) {
 672                         urb = portdata->in_urbs[j];
 673                         err = usb_submit_urb(urb, GFP_ATOMIC);
 674                         if (err < 0) {
 675                                 dev_err(&port->dev,
 676                                         "%s: submit read urb %d failed: %d\n",
 677                                         __func__, i, err);
 678                                 err_count++;
 679                         }
 680                 }
 681         }
 682         intfdata->suspended = 0;
 683         spin_unlock_irq(&intfdata->susp_lock);
 684
 685         if (err_count)
 686                 return -EIO;
 687
 688         return 0;
 689 }
 690 EXPORT_SYMBOL(usb_wwan_resume);
 691 #endif
 692
 693 MODULE_AUTHOR(DRIVER_AUTHOR);
 694 MODULE_DESCRIPTION(DRIVER_DESC);
 695 MODULE_LICENSE("GPL");