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 void usb_wwan_set_termios(struct tty_struct *tty,
  59                           struct usb_serial_port *port,
  60                           struct ktermios *old_termios)
  61 {
  62         struct usb_wwan_intf_private *intfdata = port->serial->private;
  63
  64         /* Doesn't support option setting */
  65         tty_termios_copy_hw(&tty->termios, old_termios);
  66
  67         if (intfdata->send_setup)
  68                 intfdata->send_setup(port);
  69 }
  70 EXPORT_SYMBOL(usb_wwan_set_termios);
  71
  72 int usb_wwan_tiocmget(struct tty_struct *tty)
  73 {
  74         struct usb_serial_port *port = tty->driver_data;
  75         unsigned int value;
  76         struct usb_wwan_port_private *portdata;
  77
  78         portdata = usb_get_serial_port_data(port);
  79
  80         value = ((portdata->rts_state) ? TIOCM_RTS : 0) |
  81             ((portdata->dtr_state) ? TIOCM_DTR : 0) |
  82             ((portdata->cts_state) ? TIOCM_CTS : 0) |
  83             ((portdata->dsr_state) ? TIOCM_DSR : 0) |
  84             ((portdata->dcd_state) ? TIOCM_CAR : 0) |
  85             ((portdata->ri_state) ? TIOCM_RNG : 0);
  86
  87         return value;
  88 }
  89 EXPORT_SYMBOL(usb_wwan_tiocmget);
  90
  91 int usb_wwan_tiocmset(struct tty_struct *tty,
  92                       unsigned int set, unsigned int clear)
  93 {
  94         struct usb_serial_port *port = tty->driver_data;
  95         struct usb_wwan_port_private *portdata;
  96         struct usb_wwan_intf_private *intfdata;
  97
  98         portdata = usb_get_serial_port_data(port);
  99         intfdata = port->serial->private;
 100
 101         if (!intfdata->send_setup)
 102                 return -EINVAL;
 103
 104         /* FIXME: what locks portdata fields ? */
 105         if (set & TIOCM_RTS)
 106                 portdata->rts_state = 1;
 107         if (set & TIOCM_DTR)
 108                 portdata->dtr_state = 1;
 109
 110         if (clear & TIOCM_RTS)
 111                 portdata->rts_state = 0;
 112         if (clear & TIOCM_DTR)
 113                 portdata->dtr_state = 0;
 114         return intfdata->send_setup(port);
 115 }
 116 EXPORT_SYMBOL(usb_wwan_tiocmset);
 117
 118 static int get_serial_info(struct usb_serial_port *port,
 119                            struct serial_struct __user *retinfo)
 120 {
 121         struct serial_struct tmp;
 122
 123         if (!retinfo)
 124                 return -EFAULT;
 125
 126         memset(&tmp, 0, sizeof(tmp));
 127         tmp.line            = port->minor;
 128         tmp.port            = port->port_number;
 129         tmp.baud_base       = tty_get_baud_rate(port->port.tty);
 130         tmp.close_delay     = port->port.close_delay / 10;
 131         tmp.closing_wait    = port->port.closing_wait == ASYNC_CLOSING_WAIT_NONE ?
 132                                  ASYNC_CLOSING_WAIT_NONE :
 133                                  port->port.closing_wait / 10;
 134
 135         if (copy_to_user(retinfo, &tmp, sizeof(*retinfo)))
 136                 return -EFAULT;
 137         return 0;
 138 }
 139
 140 static int set_serial_info(struct usb_serial_port *port,
 141                            struct serial_struct __user *newinfo)
 142 {
 143         struct serial_struct new_serial;
 144         unsigned int closing_wait, close_delay;
 145         int retval = 0;
 146
 147         if (copy_from_user(&new_serial, newinfo, sizeof(new_serial)))
 148                 return -EFAULT;
 149
 150         close_delay = new_serial.close_delay * 10;
 151         closing_wait = new_serial.closing_wait == ASYNC_CLOSING_WAIT_NONE ?
 152                         ASYNC_CLOSING_WAIT_NONE : new_serial.closing_wait * 10;
 153
 154         mutex_lock(&port->port.mutex);
 155
 156         if (!capable(CAP_SYS_ADMIN)) {
 157                 if ((close_delay != port->port.close_delay) ||
 158                     (closing_wait != port->port.closing_wait))
 159                         retval = -EPERM;
 160                 else
 161                         retval = -EOPNOTSUPP;
 162         } else {
 163                 port->port.close_delay  = close_delay;
 164                 port->port.closing_wait = closing_wait;
 165         }
 166
 167         mutex_unlock(&port->port.mutex);
 168         return retval;
 169 }
 170
 171 int usb_wwan_ioctl(struct tty_struct *tty,
 172                    unsigned int cmd, unsigned long arg)
 173 {
 174         struct usb_serial_port *port = tty->driver_data;
 175
 176         dev_dbg(&port->dev, "%s cmd 0x%04x\n", __func__, cmd);
 177
 178         switch (cmd) {
 179         case TIOCGSERIAL:
 180                 return get_serial_info(port,
 181                                        (struct serial_struct __user *) arg);
 182         case TIOCSSERIAL:
 183                 return set_serial_info(port,
 184                                        (struct serial_struct __user *) arg);
 185         default:
 186                 break;
 187         }
 188
 189         dev_dbg(&port->dev, "%s arg not supported\n", __func__);
 190
 191         return -ENOIOCTLCMD;
 192 }
 193 EXPORT_SYMBOL(usb_wwan_ioctl);
 194
 195 /* Write */
 196 int usb_wwan_write(struct tty_struct *tty, struct usb_serial_port *port,
 197                    const unsigned char *buf, int count)
 198 {
 199         struct usb_wwan_port_private *portdata;
 200         struct usb_wwan_intf_private *intfdata;
 201         int i;
 202         int left, todo;
 203         struct urb *this_urb = NULL;    /* spurious */
 204         int err;
 205         unsigned long flags;
 206
 207         portdata = usb_get_serial_port_data(port);
 208         intfdata = port->serial->private;
 209
 210         dev_dbg(&port->dev, "%s: write (%d chars)\n", __func__, count);
 211
 212         i = 0;
 213         left = count;
 214         for (i = 0; left > 0 && i < N_OUT_URB; i++) {
 215                 todo = left;
 216                 if (todo > OUT_BUFLEN)
 217                         todo = OUT_BUFLEN;
 218
 219                 this_urb = portdata->out_urbs[i];
 220                 if (test_and_set_bit(i, &portdata->out_busy)) {
 221                         if (time_before(jiffies,
 222                                         portdata->tx_start_time[i] + 10 * HZ))
 223                                 continue;
 224                         usb_unlink_urb(this_urb);
 225                         continue;
 226                 }
 227                 dev_dbg(&port->dev, "%s: endpoint %d buf %d\n", __func__,
 228                         usb_pipeendpoint(this_urb->pipe), i);
 229
 230                 err = usb_autopm_get_interface_async(port->serial->interface);
 231                 if (err < 0)
 232                         break;
 233
 234                 /* send the data */
 235                 memcpy(this_urb->transfer_buffer, buf, todo);
 236                 this_urb->transfer_buffer_length = todo;
 237
 238                 spin_lock_irqsave(&intfdata->susp_lock, flags);
 239                 if (intfdata->suspended) {
 240                         usb_anchor_urb(this_urb, &portdata->delayed);
 241                         spin_unlock_irqrestore(&intfdata->susp_lock, flags);
 242                 } else {
 243                         intfdata->in_flight++;
 244                         spin_unlock_irqrestore(&intfdata->susp_lock, flags);
 245                         err = usb_submit_urb(this_urb, GFP_ATOMIC);
 246                         if (err) {
 247                                 dev_dbg(&port->dev,
 248                                         "usb_submit_urb %p (write bulk) failed (%d)\n",
 249                                         this_urb, err);
 250                                 clear_bit(i, &portdata->out_busy);
 251                                 spin_lock_irqsave(&intfdata->susp_lock, flags);
 252                                 intfdata->in_flight--;
 253                                 spin_unlock_irqrestore(&intfdata->susp_lock,
 254                                                        flags);
 255                                 usb_autopm_put_interface_async(port->serial->interface);
 256                                 break;
 257                         }
 258                 }
 259
 260                 portdata->tx_start_time[i] = jiffies;
 261                 buf += todo;
 262                 left -= todo;
 263         }
 264
 265         count -= left;
 266         dev_dbg(&port->dev, "%s: wrote (did %d)\n", __func__, count);
 267         return count;
 268 }
 269 EXPORT_SYMBOL(usb_wwan_write);
 270
 271 static void usb_wwan_indat_callback(struct urb *urb)
 272 {
 273         int err;
 274         int endpoint;
 275         struct usb_serial_port *port;
 276         struct device *dev;
 277         unsigned char *data = urb->transfer_buffer;
 278         int status = urb->status;
 279
 280         endpoint = usb_pipeendpoint(urb->pipe);
 281         port = urb->context;
 282         dev = &port->dev;
 283
 284         if (status) {
 285                 dev_dbg(dev, "%s: nonzero status: %d on endpoint %02x.\n",
 286                         __func__, status, endpoint);
 287         } else {
 288                 if (urb->actual_length) {
 289                         tty_insert_flip_string(&port->port, data,
 290                                         urb->actual_length);
 291                         tty_flip_buffer_push(&port->port);
 292                 } else
 293                         dev_dbg(dev, "%s: empty read urb received\n", __func__);
 294
 295                 /* Resubmit urb so we continue receiving */
 296                 err = usb_submit_urb(urb, GFP_ATOMIC);
 297                 if (err) {
 298                         if (err != -EPERM) {
 299                                 dev_err(dev, "%s: resubmit read urb failed. (%d)\n", __func__, err);
 300                                 /* busy also in error unless we are killed */
 301                                 usb_mark_last_busy(port->serial->dev);
 302                         }
 303                 } else {
 304                         usb_mark_last_busy(port->serial->dev);
 305                 }
 306         }
 307 }
 308
 309 static void usb_wwan_outdat_callback(struct urb *urb)
 310 {
 311         struct usb_serial_port *port;
 312         struct usb_wwan_port_private *portdata;
 313         struct usb_wwan_intf_private *intfdata;
 314         int i;
 315
 316         port = urb->context;
 317         intfdata = port->serial->private;
 318
 319         usb_serial_port_softint(port);
 320         usb_autopm_put_interface_async(port->serial->interface);
 321         portdata = usb_get_serial_port_data(port);
 322         spin_lock(&intfdata->susp_lock);
 323         intfdata->in_flight--;
 324         spin_unlock(&intfdata->susp_lock);
 325
 326         for (i = 0; i < N_OUT_URB; ++i) {
 327                 if (portdata->out_urbs[i] == urb) {
 328                         smp_mb__before_clear_bit();
 329                         clear_bit(i, &portdata->out_busy);
 330                         break;
 331                 }
 332         }
 333 }
 334
 335 int usb_wwan_write_room(struct tty_struct *tty)
 336 {
 337         struct usb_serial_port *port = tty->driver_data;
 338         struct usb_wwan_port_private *portdata;
 339         int i;
 340         int data_len = 0;
 341         struct urb *this_urb;
 342
 343         portdata = usb_get_serial_port_data(port);
 344
 345         for (i = 0; i < N_OUT_URB; i++) {
 346                 this_urb = portdata->out_urbs[i];
 347                 if (this_urb && !test_bit(i, &portdata->out_busy))
 348                         data_len += OUT_BUFLEN;
 349         }
 350
 351         dev_dbg(&port->dev, "%s: %d\n", __func__, data_len);
 352         return data_len;
 353 }
 354 EXPORT_SYMBOL(usb_wwan_write_room);
 355
 356 int usb_wwan_chars_in_buffer(struct tty_struct *tty)
 357 {
 358         struct usb_serial_port *port = tty->driver_data;
 359         struct usb_wwan_port_private *portdata;
 360         int i;
 361         int data_len = 0;
 362         struct urb *this_urb;
 363
 364         portdata = usb_get_serial_port_data(port);
 365
 366         for (i = 0; i < N_OUT_URB; i++) {
 367                 this_urb = portdata->out_urbs[i];
 368                 /* FIXME: This locking is insufficient as this_urb may
 369                    go unused during the test */
 370                 if (this_urb && test_bit(i, &portdata->out_busy))
 371                         data_len += this_urb->transfer_buffer_length;
 372         }
 373         dev_dbg(&port->dev, "%s: %d\n", __func__, data_len);
 374         return data_len;
 375 }
 376 EXPORT_SYMBOL(usb_wwan_chars_in_buffer);
 377
 378 int usb_wwan_open(struct tty_struct *tty, struct usb_serial_port *port)
 379 {
 380         struct usb_wwan_port_private *portdata;
 381         struct usb_wwan_intf_private *intfdata;
 382         struct usb_serial *serial = port->serial;
 383         int i, err;
 384         struct urb *urb;
 385
 386         portdata = usb_get_serial_port_data(port);
 387         intfdata = serial->private;
 388
 389         /* Start reading from the IN endpoint */
 390         for (i = 0; i < N_IN_URB; i++) {
 391                 urb = portdata->in_urbs[i];
 392                 if (!urb)
 393                         continue;
 394                 err = usb_submit_urb(urb, GFP_KERNEL);
 395                 if (err) {
 396                         dev_dbg(&port->dev, "%s: submit urb %d failed (%d) %d\n",
 397                                 __func__, i, err, urb->transfer_buffer_length);
 398                 }
 399         }
 400
 401         if (intfdata->send_setup)
 402                 intfdata->send_setup(port);
 403
 404         serial->interface->needs_remote_wakeup = 1;
 405         spin_lock_irq(&intfdata->susp_lock);
 406         portdata->opened = 1;
 407         spin_unlock_irq(&intfdata->susp_lock);
 408         /* this balances a get in the generic USB serial code */
 409         usb_autopm_put_interface(serial->interface);
 410
 411         return 0;
 412 }
 413 EXPORT_SYMBOL(usb_wwan_open);
 414
 415 void usb_wwan_close(struct usb_serial_port *port)
 416 {
 417         int i;
 418         struct usb_serial *serial = port->serial;
 419         struct usb_wwan_port_private *portdata;
 420         struct usb_wwan_intf_private *intfdata = port->serial->private;
 421
 422         portdata = usb_get_serial_port_data(port);
 423
 424         /* Stop reading/writing urbs */
 425         spin_lock_irq(&intfdata->susp_lock);
 426         portdata->opened = 0;
 427         spin_unlock_irq(&intfdata->susp_lock);
 428
 429         for (i = 0; i < N_IN_URB; i++)
 430                 usb_kill_urb(portdata->in_urbs[i]);
 431         for (i = 0; i < N_OUT_URB; i++)
 432                 usb_kill_urb(portdata->out_urbs[i]);
 433
 434         /* balancing - important as an error cannot be handled*/
 435         usb_autopm_get_interface_no_resume(serial->interface);
 436         serial->interface->needs_remote_wakeup = 0;
 437 }
 438 EXPORT_SYMBOL(usb_wwan_close);
 439
 440 /* Helper functions used by usb_wwan_setup_urbs */
 441 static struct urb *usb_wwan_setup_urb(struct usb_serial_port *port,
 442                                       int endpoint,
 443                                       int dir, void *ctx, char *buf, int len,
 444                                       void (*callback) (struct urb *))
 445 {
 446         struct usb_serial *serial = port->serial;
 447         struct urb *urb;
 448
 449         urb = usb_alloc_urb(0, GFP_KERNEL);     /* No ISO */
 450         if (urb == NULL) {
 451                 dev_dbg(&serial->interface->dev,
 452                         "%s: alloc for endpoint %d failed.\n", __func__,
 453                         endpoint);
 454                 return NULL;
 455         }
 456
 457         /* Fill URB using supplied data. */
 458         usb_fill_bulk_urb(urb, serial->dev,
 459                           usb_sndbulkpipe(serial->dev, endpoint) | dir,
 460                           buf, len, callback, ctx);
 461
 462         return urb;
 463 }
 464
 465 int usb_wwan_port_probe(struct usb_serial_port *port)
 466 {
 467         struct usb_wwan_port_private *portdata;
 468         struct urb *urb;
 469         u8 *buffer;
 470         int err;
 471         int i;
 472
 473         portdata = kzalloc(sizeof(*portdata), GFP_KERNEL);
 474         if (!portdata)
 475                 return -ENOMEM;
 476
 477         init_usb_anchor(&portdata->delayed);
 478
 479         for (i = 0; i < N_IN_URB; i++) {
 480                 if (!port->bulk_in_size)
 481                         break;
 482
 483                 buffer = (u8 *)__get_free_page(GFP_KERNEL);
 484                 if (!buffer)
 485                         goto bail_out_error;
 486                 portdata->in_buffer[i] = buffer;
 487
 488                 urb = usb_wwan_setup_urb(port, port->bulk_in_endpointAddress,
 489                                                 USB_DIR_IN, port,
 490                                                 buffer, IN_BUFLEN,
 491                                                 usb_wwan_indat_callback);
 492                 portdata->in_urbs[i] = urb;
 493         }
 494
 495         for (i = 0; i < N_OUT_URB; i++) {
 496                 if (!port->bulk_out_size)
 497                         break;
 498
 499                 buffer = kmalloc(OUT_BUFLEN, GFP_KERNEL);
 500                 if (!buffer)
 501                         goto bail_out_error2;
 502                 portdata->out_buffer[i] = buffer;
 503
 504                 urb = usb_wwan_setup_urb(port, port->bulk_out_endpointAddress,
 505                                                 USB_DIR_OUT, port,
 506                                                 buffer, OUT_BUFLEN,
 507                                                 usb_wwan_outdat_callback);
 508                 portdata->out_urbs[i] = urb;
 509         }
 510
 511         usb_set_serial_port_data(port, portdata);
 512
 513         if (port->interrupt_in_urb) {
 514                 err = usb_submit_urb(port->interrupt_in_urb, GFP_KERNEL);
 515                 if (err)
 516                         dev_dbg(&port->dev, "%s: submit irq_in urb failed %d\n",
 517                                 __func__, err);
 518         }
 519
 520         return 0;
 521
 522 bail_out_error2:
 523         for (i = 0; i < N_OUT_URB; i++) {
 524                 usb_free_urb(portdata->out_urbs[i]);
 525                 kfree(portdata->out_buffer[i]);
 526         }
 527 bail_out_error:
 528         for (i = 0; i < N_IN_URB; i++) {
 529                 usb_free_urb(portdata->in_urbs[i]);
 530                 free_page((unsigned long)portdata->in_buffer[i]);
 531         }
 532         kfree(portdata);
 533
 534         return -ENOMEM;
 535 }
 536 EXPORT_SYMBOL_GPL(usb_wwan_port_probe);
 537
 538 int usb_wwan_port_remove(struct usb_serial_port *port)
 539 {
 540         int i;
 541         struct usb_wwan_port_private *portdata;
 542
 543         portdata = usb_get_serial_port_data(port);
 544         usb_set_serial_port_data(port, NULL);
 545
 546         /* Stop reading/writing urbs and free them */
 547         for (i = 0; i < N_IN_URB; i++) {
 548                 usb_kill_urb(portdata->in_urbs[i]);
 549                 usb_free_urb(portdata->in_urbs[i]);
 550                 free_page((unsigned long)portdata->in_buffer[i]);
 551         }
 552         for (i = 0; i < N_OUT_URB; i++) {
 553                 usb_kill_urb(portdata->out_urbs[i]);
 554                 usb_free_urb(portdata->out_urbs[i]);
 555                 kfree(portdata->out_buffer[i]);
 556         }
 557
 558         /* Now free port private data */
 559         kfree(portdata);
 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         int b;
 588
 589         if (PMSG_IS_AUTO(message)) {
 590                 spin_lock_irq(&intfdata->susp_lock);
 591                 b = intfdata->in_flight;
 592                 spin_unlock_irq(&intfdata->susp_lock);
 593
 594                 if (b)
 595                         return -EBUSY;
 596         }
 597
 598         spin_lock_irq(&intfdata->susp_lock);
 599         intfdata->suspended = 1;
 600         spin_unlock_irq(&intfdata->susp_lock);
 601         stop_read_write_urbs(serial);
 602
 603         return 0;
 604 }
 605 EXPORT_SYMBOL(usb_wwan_suspend);
 606
 607 static void unbusy_queued_urb(struct urb *urb, struct usb_wwan_port_private *portdata)
 608 {
 609         int i;
 610
 611         for (i = 0; i < N_OUT_URB; i++) {
 612                 if (urb == portdata->out_urbs[i]) {
 613                         clear_bit(i, &portdata->out_busy);
 614                         break;
 615                 }
 616         }
 617 }
 618
 619 static void play_delayed(struct usb_serial_port *port)
 620 {
 621         struct usb_wwan_intf_private *data;
 622         struct usb_wwan_port_private *portdata;
 623         struct urb *urb;
 624         int err;
 625
 626         portdata = usb_get_serial_port_data(port);
 627         data = port->serial->private;
 628         while ((urb = usb_get_from_anchor(&portdata->delayed))) {
 629                 err = usb_submit_urb(urb, GFP_ATOMIC);
 630                 if (!err) {
 631                         data->in_flight++;
 632                 } else {
 633                         /* we have to throw away the rest */
 634                         do {
 635                                 unbusy_queued_urb(urb, portdata);
 636                                 usb_autopm_put_interface_no_suspend(port->serial->interface);
 637                         } while ((urb = usb_get_from_anchor(&portdata->delayed)));
 638                         break;
 639                 }
 640         }
 641 }
 642
 643 int usb_wwan_resume(struct usb_serial *serial)
 644 {
 645         int i, j;
 646         struct usb_serial_port *port;
 647         struct usb_wwan_intf_private *intfdata = serial->private;
 648         struct usb_wwan_port_private *portdata;
 649         struct urb *urb;
 650         int err = 0;
 651
 652         /* get the interrupt URBs resubmitted unconditionally */
 653         for (i = 0; i < serial->num_ports; i++) {
 654                 port = serial->port[i];
 655                 if (!port->interrupt_in_urb) {
 656                         dev_dbg(&port->dev, "%s: No interrupt URB for port\n", __func__);
 657                         continue;
 658                 }
 659                 err = usb_submit_urb(port->interrupt_in_urb, GFP_NOIO);
 660                 dev_dbg(&port->dev, "Submitted interrupt URB for port (result %d)\n", err);
 661                 if (err < 0) {
 662                         dev_err(&port->dev, "%s: Error %d for interrupt URB\n",
 663                                 __func__, err);
 664                         goto err_out;
 665                 }
 666         }
 667
 668         for (i = 0; i < serial->num_ports; i++) {
 669                 /* walk all ports */
 670                 port = serial->port[i];
 671                 portdata = usb_get_serial_port_data(port);
 672
 673                 /* skip closed ports */
 674                 spin_lock_irq(&intfdata->susp_lock);
 675                 if (!portdata || !portdata->opened) {
 676                         spin_unlock_irq(&intfdata->susp_lock);
 677                         continue;
 678                 }
 679
 680                 for (j = 0; j < N_IN_URB; j++) {
 681                         urb = portdata->in_urbs[j];
 682                         err = usb_submit_urb(urb, GFP_ATOMIC);
 683                         if (err < 0) {
 684                                 dev_err(&port->dev, "%s: Error %d for bulk URB %d\n",
 685                                         __func__, err, i);
 686                                 spin_unlock_irq(&intfdata->susp_lock);
 687                                 goto err_out;
 688                         }
 689                 }
 690                 play_delayed(port);
 691                 spin_unlock_irq(&intfdata->susp_lock);
 692         }
 693         spin_lock_irq(&intfdata->susp_lock);
 694         intfdata->suspended = 0;
 695         spin_unlock_irq(&intfdata->susp_lock);
 696 err_out:
 697         return err;
 698 }
 699 EXPORT_SYMBOL(usb_wwan_resume);
 700 #endif
 701
 702 MODULE_AUTHOR(DRIVER_AUTHOR);
 703 MODULE_DESCRIPTION(DRIVER_DESC);
 704 MODULE_LICENSE("GPL");