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                         clear_bit(i, &portdata->out_busy);
 233                         break;
 234                 }
 235
 236                 /* send the data */
 237                 memcpy(this_urb->transfer_buffer, buf, todo);
 238                 this_urb->transfer_buffer_length = todo;
 239
 240                 spin_lock_irqsave(&intfdata->susp_lock, flags);
 241                 if (intfdata->suspended) {
 242                         usb_anchor_urb(this_urb, &portdata->delayed);
 243                         spin_unlock_irqrestore(&intfdata->susp_lock, flags);
 244                 } else {
 245                         intfdata->in_flight++;
 246                         spin_unlock_irqrestore(&intfdata->susp_lock, flags);
 247                         err = usb_submit_urb(this_urb, GFP_ATOMIC);
 248                         if (err) {
 249                                 dev_dbg(&port->dev,
 250                                         "usb_submit_urb %p (write bulk) failed (%d)\n",
 251                                         this_urb, err);
 252                                 clear_bit(i, &portdata->out_busy);
 253                                 spin_lock_irqsave(&intfdata->susp_lock, flags);
 254                                 intfdata->in_flight--;
 255                                 spin_unlock_irqrestore(&intfdata->susp_lock,
 256                                                        flags);
 257                                 usb_autopm_put_interface_async(port->serial->interface);
 258                                 break;
 259                         }
 260                 }
 261
 262                 portdata->tx_start_time[i] = jiffies;
 263                 buf += todo;
 264                 left -= todo;
 265         }
 266
 267         count -= left;
 268         dev_dbg(&port->dev, "%s: wrote (did %d)\n", __func__, count);
 269         return count;
 270 }
 271 EXPORT_SYMBOL(usb_wwan_write);
 272
 273 static void usb_wwan_indat_callback(struct urb *urb)
 274 {
 275         int err;
 276         int endpoint;
 277         struct usb_serial_port *port;
 278         struct device *dev;
 279         unsigned char *data = urb->transfer_buffer;
 280         int status = urb->status;
 281
 282         endpoint = usb_pipeendpoint(urb->pipe);
 283         port = urb->context;
 284         dev = &port->dev;
 285
 286         if (status) {
 287                 dev_dbg(dev, "%s: nonzero status: %d on endpoint %02x.\n",
 288                         __func__, status, endpoint);
 289         } else {
 290                 if (urb->actual_length) {
 291                         tty_insert_flip_string(&port->port, data,
 292                                         urb->actual_length);
 293                         tty_flip_buffer_push(&port->port);
 294                 } else
 295                         dev_dbg(dev, "%s: empty read urb received\n", __func__);
 296         }
 297         /* Resubmit urb so we continue receiving */
 298         err = usb_submit_urb(urb, GFP_ATOMIC);
 299         if (err) {
 300                 if (err != -EPERM) {
 301                         dev_err(dev, "%s: resubmit read urb failed. (%d)\n",
 302                                 __func__, err);
 303                         /* busy also in error unless we are killed */
 304                         usb_mark_last_busy(port->serial->dev);
 305                 }
 306         } else {
 307                 usb_mark_last_busy(port->serial->dev);
 308         }
 309 }
 310
 311 static void usb_wwan_outdat_callback(struct urb *urb)
 312 {
 313         struct usb_serial_port *port;
 314         struct usb_wwan_port_private *portdata;
 315         struct usb_wwan_intf_private *intfdata;
 316         int i;
 317
 318         port = urb->context;
 319         intfdata = port->serial->private;
 320
 321         usb_serial_port_softint(port);
 322         usb_autopm_put_interface_async(port->serial->interface);
 323         portdata = usb_get_serial_port_data(port);
 324         spin_lock(&intfdata->susp_lock);
 325         intfdata->in_flight--;
 326         spin_unlock(&intfdata->susp_lock);
 327
 328         for (i = 0; i < N_OUT_URB; ++i) {
 329                 if (portdata->out_urbs[i] == urb) {
 330                         smp_mb__before_clear_bit();
 331                         clear_bit(i, &portdata->out_busy);
 332                         break;
 333                 }
 334         }
 335 }
 336
 337 int usb_wwan_write_room(struct tty_struct *tty)
 338 {
 339         struct usb_serial_port *port = tty->driver_data;
 340         struct usb_wwan_port_private *portdata;
 341         int i;
 342         int data_len = 0;
 343         struct urb *this_urb;
 344
 345         portdata = usb_get_serial_port_data(port);
 346
 347         for (i = 0; i < N_OUT_URB; i++) {
 348                 this_urb = portdata->out_urbs[i];
 349                 if (this_urb && !test_bit(i, &portdata->out_busy))
 350                         data_len += OUT_BUFLEN;
 351         }
 352
 353         dev_dbg(&port->dev, "%s: %d\n", __func__, data_len);
 354         return data_len;
 355 }
 356 EXPORT_SYMBOL(usb_wwan_write_room);
 357
 358 int usb_wwan_chars_in_buffer(struct tty_struct *tty)
 359 {
 360         struct usb_serial_port *port = tty->driver_data;
 361         struct usb_wwan_port_private *portdata;
 362         int i;
 363         int data_len = 0;
 364         struct urb *this_urb;
 365
 366         portdata = usb_get_serial_port_data(port);
 367
 368         for (i = 0; i < N_OUT_URB; i++) {
 369                 this_urb = portdata->out_urbs[i];
 370                 /* FIXME: This locking is insufficient as this_urb may
 371                    go unused during the test */
 372                 if (this_urb && test_bit(i, &portdata->out_busy))
 373                         data_len += this_urb->transfer_buffer_length;
 374         }
 375         dev_dbg(&port->dev, "%s: %d\n", __func__, data_len);
 376         return data_len;
 377 }
 378 EXPORT_SYMBOL(usb_wwan_chars_in_buffer);
 379
 380 int usb_wwan_open(struct tty_struct *tty, struct usb_serial_port *port)
 381 {
 382         struct usb_wwan_port_private *portdata;
 383         struct usb_wwan_intf_private *intfdata;
 384         struct usb_serial *serial = port->serial;
 385         int i, err;
 386         struct urb *urb;
 387
 388         portdata = usb_get_serial_port_data(port);
 389         intfdata = serial->private;
 390
 391         if (port->interrupt_in_urb) {
 392                 err = usb_submit_urb(port->interrupt_in_urb, GFP_KERNEL);
 393                 if (err) {
 394                         dev_dbg(&port->dev, "%s: submit int urb failed: %d\n",
 395                                 __func__, err);
 396                 }
 397         }
 398
 399         /* Start reading from the IN endpoint */
 400         for (i = 0; i < N_IN_URB; i++) {
 401                 urb = portdata->in_urbs[i];
 402                 if (!urb)
 403                         continue;
 404                 err = usb_submit_urb(urb, GFP_KERNEL);
 405                 if (err) {
 406                         dev_dbg(&port->dev, "%s: submit urb %d failed (%d) %d\n",
 407                                 __func__, i, err, urb->transfer_buffer_length);
 408                 }
 409         }
 410
 411         if (intfdata->send_setup)
 412                 intfdata->send_setup(port);
 413
 414         serial->interface->needs_remote_wakeup = 1;
 415         spin_lock_irq(&intfdata->susp_lock);
 416         portdata->opened = 1;
 417         spin_unlock_irq(&intfdata->susp_lock);
 418         /* this balances a get in the generic USB serial code */
 419         usb_autopm_put_interface(serial->interface);
 420
 421         return 0;
 422 }
 423 EXPORT_SYMBOL(usb_wwan_open);
 424
 425 static void unbusy_queued_urb(struct urb *urb,
 426                                         struct usb_wwan_port_private *portdata)
 427 {
 428         int i;
 429
 430         for (i = 0; i < N_OUT_URB; i++) {
 431                 if (urb == portdata->out_urbs[i]) {
 432                         clear_bit(i, &portdata->out_busy);
 433                         break;
 434                 }
 435         }
 436 }
 437
 438 void usb_wwan_close(struct usb_serial_port *port)
 439 {
 440         int i;
 441         struct usb_serial *serial = port->serial;
 442         struct usb_wwan_port_private *portdata;
 443         struct usb_wwan_intf_private *intfdata = port->serial->private;
 444         struct urb *urb;
 445
 446         portdata = usb_get_serial_port_data(port);
 447
 448         /* Stop reading/writing urbs */
 449         spin_lock_irq(&intfdata->susp_lock);
 450         portdata->opened = 0;
 451         spin_unlock_irq(&intfdata->susp_lock);
 452
 453         for (;;) {
 454                 urb = usb_get_from_anchor(&portdata->delayed);
 455                 if (!urb)
 456                         break;
 457                 unbusy_queued_urb(urb, portdata);
 458                 usb_autopm_put_interface_async(serial->interface);
 459         }
 460
 461         for (i = 0; i < N_IN_URB; i++)
 462                 usb_kill_urb(portdata->in_urbs[i]);
 463         for (i = 0; i < N_OUT_URB; i++)
 464                 usb_kill_urb(portdata->out_urbs[i]);
 465         usb_kill_urb(port->interrupt_in_urb);
 466
 467         /* balancing - important as an error cannot be handled*/
 468         usb_autopm_get_interface_no_resume(serial->interface);
 469         serial->interface->needs_remote_wakeup = 0;
 470 }
 471 EXPORT_SYMBOL(usb_wwan_close);
 472
 473 /* Helper functions used by usb_wwan_setup_urbs */
 474 static struct urb *usb_wwan_setup_urb(struct usb_serial_port *port,
 475                                       int endpoint,
 476                                       int dir, void *ctx, char *buf, int len,
 477                                       void (*callback) (struct urb *))
 478 {
 479         struct usb_serial *serial = port->serial;
 480         struct urb *urb;
 481
 482         urb = usb_alloc_urb(0, GFP_KERNEL);     /* No ISO */
 483         if (urb == NULL) {
 484                 dev_dbg(&serial->interface->dev,
 485                         "%s: alloc for endpoint %d failed.\n", __func__,
 486                         endpoint);
 487                 return NULL;
 488         }
 489
 490         /* Fill URB using supplied data. */
 491         usb_fill_bulk_urb(urb, serial->dev,
 492                           usb_sndbulkpipe(serial->dev, endpoint) | dir,
 493                           buf, len, callback, ctx);
 494
 495         return urb;
 496 }
 497
 498 int usb_wwan_port_probe(struct usb_serial_port *port)
 499 {
 500         struct usb_wwan_port_private *portdata;
 501         struct urb *urb;
 502         u8 *buffer;
 503         int i;
 504
 505         if (!port->bulk_in_size || !port->bulk_out_size)
 506                 return -ENODEV;
 507
 508         portdata = kzalloc(sizeof(*portdata), GFP_KERNEL);
 509         if (!portdata)
 510                 return -ENOMEM;
 511
 512         init_usb_anchor(&portdata->delayed);
 513
 514         for (i = 0; i < N_IN_URB; i++) {
 515                 buffer = (u8 *)__get_free_page(GFP_KERNEL);
 516                 if (!buffer)
 517                         goto bail_out_error;
 518                 portdata->in_buffer[i] = buffer;
 519
 520                 urb = usb_wwan_setup_urb(port, port->bulk_in_endpointAddress,
 521                                                 USB_DIR_IN, port,
 522                                                 buffer, IN_BUFLEN,
 523                                                 usb_wwan_indat_callback);
 524                 portdata->in_urbs[i] = urb;
 525         }
 526
 527         for (i = 0; i < N_OUT_URB; i++) {
 528                 buffer = kmalloc(OUT_BUFLEN, GFP_KERNEL);
 529                 if (!buffer)
 530                         goto bail_out_error2;
 531                 portdata->out_buffer[i] = buffer;
 532
 533                 urb = usb_wwan_setup_urb(port, port->bulk_out_endpointAddress,
 534                                                 USB_DIR_OUT, port,
 535                                                 buffer, OUT_BUFLEN,
 536                                                 usb_wwan_outdat_callback);
 537                 portdata->out_urbs[i] = urb;
 538         }
 539
 540         usb_set_serial_port_data(port, portdata);
 541
 542         return 0;
 543
 544 bail_out_error2:
 545         for (i = 0; i < N_OUT_URB; i++) {
 546                 usb_free_urb(portdata->out_urbs[i]);
 547                 kfree(portdata->out_buffer[i]);
 548         }
 549 bail_out_error:
 550         for (i = 0; i < N_IN_URB; i++) {
 551                 usb_free_urb(portdata->in_urbs[i]);
 552                 free_page((unsigned long)portdata->in_buffer[i]);
 553         }
 554         kfree(portdata);
 555
 556         return -ENOMEM;
 557 }
 558 EXPORT_SYMBOL_GPL(usb_wwan_port_probe);
 559
 560 int usb_wwan_port_remove(struct usb_serial_port *port)
 561 {
 562         int i;
 563         struct usb_wwan_port_private *portdata;
 564
 565         portdata = usb_get_serial_port_data(port);
 566         usb_set_serial_port_data(port, NULL);
 567
 568         /* Stop reading/writing urbs and free them */
 569         for (i = 0; i < N_IN_URB; i++) {
 570                 usb_kill_urb(portdata->in_urbs[i]);
 571                 usb_free_urb(portdata->in_urbs[i]);
 572                 free_page((unsigned long)portdata->in_buffer[i]);
 573         }
 574         for (i = 0; i < N_OUT_URB; i++) {
 575                 usb_kill_urb(portdata->out_urbs[i]);
 576                 usb_free_urb(portdata->out_urbs[i]);
 577                 kfree(portdata->out_buffer[i]);
 578         }
 579
 580         /* Now free port private data */
 581         kfree(portdata);
 582         return 0;
 583 }
 584 EXPORT_SYMBOL(usb_wwan_port_remove);
 585
 586 #ifdef CONFIG_PM
 587 static void stop_read_write_urbs(struct usb_serial *serial)
 588 {
 589         int i, j;
 590         struct usb_serial_port *port;
 591         struct usb_wwan_port_private *portdata;
 592
 593         /* Stop reading/writing urbs */
 594         for (i = 0; i < serial->num_ports; ++i) {
 595                 port = serial->port[i];
 596                 portdata = usb_get_serial_port_data(port);
 597                 if (!portdata)
 598                         continue;
 599                 for (j = 0; j < N_IN_URB; j++)
 600                         usb_kill_urb(portdata->in_urbs[j]);
 601                 for (j = 0; j < N_OUT_URB; j++)
 602                         usb_kill_urb(portdata->out_urbs[j]);
 603         }
 604 }
 605
 606 int usb_wwan_suspend(struct usb_serial *serial, pm_message_t message)
 607 {
 608         struct usb_wwan_intf_private *intfdata = serial->private;
 609
 610         spin_lock_irq(&intfdata->susp_lock);
 611         if (PMSG_IS_AUTO(message)) {
 612                 if (intfdata->in_flight) {
 613                         spin_unlock_irq(&intfdata->susp_lock);
 614                         return -EBUSY;
 615                 }
 616         }
 617         intfdata->suspended = 1;
 618         spin_unlock_irq(&intfdata->susp_lock);
 619
 620         stop_read_write_urbs(serial);
 621
 622         return 0;
 623 }
 624 EXPORT_SYMBOL(usb_wwan_suspend);
 625
 626 static int play_delayed(struct usb_serial_port *port)
 627 {
 628         struct usb_wwan_intf_private *data;
 629         struct usb_wwan_port_private *portdata;
 630         struct urb *urb;
 631         int err = 0;
 632
 633         portdata = usb_get_serial_port_data(port);
 634         data = port->serial->private;
 635         while ((urb = usb_get_from_anchor(&portdata->delayed))) {
 636                 err = usb_submit_urb(urb, GFP_ATOMIC);
 637                 if (!err) {
 638                         data->in_flight++;
 639                 } else {
 640                         /* we have to throw away the rest */
 641                         do {
 642                                 unbusy_queued_urb(urb, portdata);
 643                                 usb_autopm_put_interface_no_suspend(port->serial->interface);
 644                         } while ((urb = usb_get_from_anchor(&portdata->delayed)));
 645                         break;
 646                 }
 647         }
 648
 649         return err;
 650 }
 651
 652 int usb_wwan_resume(struct usb_serial *serial)
 653 {
 654         int i, j;
 655         struct usb_serial_port *port;
 656         struct usb_wwan_intf_private *intfdata = serial->private;
 657         struct usb_wwan_port_private *portdata;
 658         struct urb *urb;
 659         int err;
 660         int err_count = 0;
 661
 662         spin_lock_irq(&intfdata->susp_lock);
 663         for (i = 0; i < serial->num_ports; i++) {
 664                 /* walk all ports */
 665                 port = serial->port[i];
 666                 portdata = usb_get_serial_port_data(port);
 667
 668                 /* skip closed ports */
 669                 if (!portdata || !portdata->opened)
 670                         continue;
 671
 672                 if (port->interrupt_in_urb) {
 673                         err = usb_submit_urb(port->interrupt_in_urb,
 674                                         GFP_ATOMIC);
 675                         if (err) {
 676                                 dev_err(&port->dev,
 677                                         "%s: submit int urb failed: %d\n",
 678                                         __func__, err);
 679                                 err_count++;
 680                         }
 681                 }
 682
 683                 err = play_delayed(port);
 684                 if (err)
 685                         err_count++;
 686
 687                 for (j = 0; j < N_IN_URB; j++) {
 688                         urb = portdata->in_urbs[j];
 689                         err = usb_submit_urb(urb, GFP_ATOMIC);
 690                         if (err < 0) {
 691                                 dev_err(&port->dev, "%s: Error %d for bulk URB %d\n",
 692                                         __func__, err, i);
 693                                 err_count++;
 694                         }
 695                 }
 696         }
 697         intfdata->suspended = 0;
 698         spin_unlock_irq(&intfdata->susp_lock);
 699
 700         if (err_count)
 701                 return -EIO;
 702
 703         return 0;
 704 }
 705 EXPORT_SYMBOL(usb_wwan_resume);
 706 #endif
 707
 708 MODULE_AUTHOR(DRIVER_AUTHOR);
 709 MODULE_DESCRIPTION(DRIVER_DESC);
 710 MODULE_LICENSE("GPL");