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_serial *serial = port->serial;
  42         struct usb_wwan_port_private *portdata;
  43         struct usb_wwan_intf_private *intfdata;
  44
  45         intfdata = port->serial->private;
  46
  47         if (!intfdata->send_setup)
  48                 return;
  49
  50         portdata = usb_get_serial_port_data(port);
  51         mutex_lock(&serial->disc_mutex);
  52         portdata->rts_state = on;
  53         portdata->dtr_state = on;
  54         if (serial->dev)
  55                 intfdata->send_setup(port);
  56         mutex_unlock(&serial->disc_mutex);
  57 }
  58 EXPORT_SYMBOL(usb_wwan_dtr_rts);
  59
  60 void usb_wwan_set_termios(struct tty_struct *tty,
  61                           struct usb_serial_port *port,
  62                           struct ktermios *old_termios)
  63 {
  64         struct usb_wwan_intf_private *intfdata = port->serial->private;
  65
  66         /* Doesn't support option setting */
  67         tty_termios_copy_hw(&tty->termios, old_termios);
  68
  69         if (intfdata->send_setup)
  70                 intfdata->send_setup(port);
  71 }
  72 EXPORT_SYMBOL(usb_wwan_set_termios);
  73
  74 int usb_wwan_tiocmget(struct tty_struct *tty)
  75 {
  76         struct usb_serial_port *port = tty->driver_data;
  77         unsigned int value;
  78         struct usb_wwan_port_private *portdata;
  79
  80         portdata = usb_get_serial_port_data(port);
  81
  82         value = ((portdata->rts_state) ? TIOCM_RTS : 0) |
  83             ((portdata->dtr_state) ? TIOCM_DTR : 0) |
  84             ((portdata->cts_state) ? TIOCM_CTS : 0) |
  85             ((portdata->dsr_state) ? TIOCM_DSR : 0) |
  86             ((portdata->dcd_state) ? TIOCM_CAR : 0) |
  87             ((portdata->ri_state) ? TIOCM_RNG : 0);
  88
  89         return value;
  90 }
  91 EXPORT_SYMBOL(usb_wwan_tiocmget);
  92
  93 int usb_wwan_tiocmset(struct tty_struct *tty,
  94                       unsigned int set, unsigned int clear)
  95 {
  96         struct usb_serial_port *port = tty->driver_data;
  97         struct usb_wwan_port_private *portdata;
  98         struct usb_wwan_intf_private *intfdata;
  99
 100         portdata = usb_get_serial_port_data(port);
 101         intfdata = port->serial->private;
 102
 103         if (!intfdata->send_setup)
 104                 return -EINVAL;
 105
 106         /* FIXME: what locks portdata fields ? */
 107         if (set & TIOCM_RTS)
 108                 portdata->rts_state = 1;
 109         if (set & TIOCM_DTR)
 110                 portdata->dtr_state = 1;
 111
 112         if (clear & TIOCM_RTS)
 113                 portdata->rts_state = 0;
 114         if (clear & TIOCM_DTR)
 115                 portdata->dtr_state = 0;
 116         return intfdata->send_setup(port);
 117 }
 118 EXPORT_SYMBOL(usb_wwan_tiocmset);
 119
 120 static int get_serial_info(struct usb_serial_port *port,
 121                            struct serial_struct __user *retinfo)
 122 {
 123         struct serial_struct tmp;
 124
 125         if (!retinfo)
 126                 return -EFAULT;
 127
 128         memset(&tmp, 0, sizeof(tmp));
 129         tmp.line            = port->serial->minor;
 130         tmp.port            = port->number;
 131         tmp.baud_base       = tty_get_baud_rate(port->port.tty);
 132         tmp.close_delay     = port->port.close_delay / 10;
 133         tmp.closing_wait    = port->port.closing_wait == ASYNC_CLOSING_WAIT_NONE ?
 134                                  ASYNC_CLOSING_WAIT_NONE :
 135                                  port->port.closing_wait / 10;
 136
 137         if (copy_to_user(retinfo, &tmp, sizeof(*retinfo)))
 138                 return -EFAULT;
 139         return 0;
 140 }
 141
 142 static int set_serial_info(struct usb_serial_port *port,
 143                            struct serial_struct __user *newinfo)
 144 {
 145         struct serial_struct new_serial;
 146         unsigned int closing_wait, close_delay;
 147         int retval = 0;
 148
 149         if (copy_from_user(&new_serial, newinfo, sizeof(new_serial)))
 150                 return -EFAULT;
 151
 152         close_delay = new_serial.close_delay * 10;
 153         closing_wait = new_serial.closing_wait == ASYNC_CLOSING_WAIT_NONE ?
 154                         ASYNC_CLOSING_WAIT_NONE : new_serial.closing_wait * 10;
 155
 156         mutex_lock(&port->port.mutex);
 157
 158         if (!capable(CAP_SYS_ADMIN)) {
 159                 if ((close_delay != port->port.close_delay) ||
 160                     (closing_wait != port->port.closing_wait))
 161                         retval = -EPERM;
 162                 else
 163                         retval = -EOPNOTSUPP;
 164         } else {
 165                 port->port.close_delay  = close_delay;
 166                 port->port.closing_wait = closing_wait;
 167         }
 168
 169         mutex_unlock(&port->port.mutex);
 170         return retval;
 171 }
 172
 173 int usb_wwan_ioctl(struct tty_struct *tty,
 174                    unsigned int cmd, unsigned long arg)
 175 {
 176         struct usb_serial_port *port = tty->driver_data;
 177
 178         dev_dbg(&port->dev, "%s cmd 0x%04x\n", __func__, cmd);
 179
 180         switch (cmd) {
 181         case TIOCGSERIAL:
 182                 return get_serial_info(port,
 183                                        (struct serial_struct __user *) arg);
 184         case TIOCSSERIAL:
 185                 return set_serial_info(port,
 186                                        (struct serial_struct __user *) arg);
 187         default:
 188                 break;
 189         }
 190
 191         dev_dbg(&port->dev, "%s arg not supported\n", __func__);
 192
 193         return -ENOIOCTLCMD;
 194 }
 195 EXPORT_SYMBOL(usb_wwan_ioctl);
 196
 197 /* Write */
 198 int usb_wwan_write(struct tty_struct *tty, struct usb_serial_port *port,
 199                    const unsigned char *buf, int count)
 200 {
 201         struct usb_wwan_port_private *portdata;
 202         struct usb_wwan_intf_private *intfdata;
 203         int i;
 204         int left, todo;
 205         struct urb *this_urb = NULL;    /* spurious */
 206         int err;
 207         unsigned long flags;
 208
 209         portdata = usb_get_serial_port_data(port);
 210         intfdata = port->serial->private;
 211
 212         dev_dbg(&port->dev, "%s: write (%d chars)\n", __func__, count);
 213
 214         i = 0;
 215         left = count;
 216         for (i = 0; left > 0 && i < N_OUT_URB; i++) {
 217                 todo = left;
 218                 if (todo > OUT_BUFLEN)
 219                         todo = OUT_BUFLEN;
 220
 221                 this_urb = portdata->out_urbs[i];
 222                 if (test_and_set_bit(i, &portdata->out_busy)) {
 223                         if (time_before(jiffies,
 224                                         portdata->tx_start_time[i] + 10 * HZ))
 225                                 continue;
 226                         usb_unlink_urb(this_urb);
 227                         continue;
 228                 }
 229                 dev_dbg(&port->dev, "%s: endpoint %d buf %d\n", __func__,
 230                         usb_pipeendpoint(this_urb->pipe), i);
 231
 232                 err = usb_autopm_get_interface_async(port->serial->interface);
 233                 if (err < 0)
 234                         break;
 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 tty_struct *tty;
 279         struct device *dev;
 280         unsigned char *data = urb->transfer_buffer;
 281         int status = urb->status;
 282
 283         endpoint = usb_pipeendpoint(urb->pipe);
 284         port = urb->context;
 285         dev = &port->dev;
 286
 287         if (status) {
 288                 dev_dbg(dev, "%s: nonzero status: %d on endpoint %02x.\n",
 289                         __func__, status, endpoint);
 290         } else {
 291                 tty = tty_port_tty_get(&port->port);
 292                 if (tty) {
 293                         if (urb->actual_length) {
 294                                 tty_insert_flip_string(&port->port, data,
 295                                                 urb->actual_length);
 296                                 tty_flip_buffer_push(tty);
 297                         } else
 298                                 dev_dbg(dev, "%s: empty read urb received\n", __func__);
 299                         tty_kref_put(tty);
 300                 }
 301
 302                 /* Resubmit urb so we continue receiving */
 303                 err = usb_submit_urb(urb, GFP_ATOMIC);
 304                 if (err) {
 305                         if (err != -EPERM) {
 306                                 dev_err(dev, "%s: resubmit read urb failed. (%d)\n", __func__, err);
 307                                 /* busy also in error unless we are killed */
 308                                 usb_mark_last_busy(port->serial->dev);
 309                         }
 310                 } else {
 311                         usb_mark_last_busy(port->serial->dev);
 312                 }
 313         }
 314 }
 315
 316 static void usb_wwan_outdat_callback(struct urb *urb)
 317 {
 318         struct usb_serial_port *port;
 319         struct usb_wwan_port_private *portdata;
 320         struct usb_wwan_intf_private *intfdata;
 321         int i;
 322
 323         port = urb->context;
 324         intfdata = port->serial->private;
 325
 326         usb_serial_port_softint(port);
 327         usb_autopm_put_interface_async(port->serial->interface);
 328         portdata = usb_get_serial_port_data(port);
 329         spin_lock(&intfdata->susp_lock);
 330         intfdata->in_flight--;
 331         spin_unlock(&intfdata->susp_lock);
 332
 333         for (i = 0; i < N_OUT_URB; ++i) {
 334                 if (portdata->out_urbs[i] == urb) {
 335                         smp_mb__before_clear_bit();
 336                         clear_bit(i, &portdata->out_busy);
 337                         break;
 338                 }
 339         }
 340 }
 341
 342 int usb_wwan_write_room(struct tty_struct *tty)
 343 {
 344         struct usb_serial_port *port = tty->driver_data;
 345         struct usb_wwan_port_private *portdata;
 346         int i;
 347         int data_len = 0;
 348         struct urb *this_urb;
 349
 350         portdata = usb_get_serial_port_data(port);
 351
 352         for (i = 0; i < N_OUT_URB; i++) {
 353                 this_urb = portdata->out_urbs[i];
 354                 if (this_urb && !test_bit(i, &portdata->out_busy))
 355                         data_len += OUT_BUFLEN;
 356         }
 357
 358         dev_dbg(&port->dev, "%s: %d\n", __func__, data_len);
 359         return data_len;
 360 }
 361 EXPORT_SYMBOL(usb_wwan_write_room);
 362
 363 int usb_wwan_chars_in_buffer(struct tty_struct *tty)
 364 {
 365         struct usb_serial_port *port = tty->driver_data;
 366         struct usb_wwan_port_private *portdata;
 367         int i;
 368         int data_len = 0;
 369         struct urb *this_urb;
 370
 371         portdata = usb_get_serial_port_data(port);
 372
 373         for (i = 0; i < N_OUT_URB; i++) {
 374                 this_urb = portdata->out_urbs[i];
 375                 /* FIXME: This locking is insufficient as this_urb may
 376                    go unused during the test */
 377                 if (this_urb && test_bit(i, &portdata->out_busy))
 378                         data_len += this_urb->transfer_buffer_length;
 379         }
 380         dev_dbg(&port->dev, "%s: %d\n", __func__, data_len);
 381         return data_len;
 382 }
 383 EXPORT_SYMBOL(usb_wwan_chars_in_buffer);
 384
 385 int usb_wwan_open(struct tty_struct *tty, struct usb_serial_port *port)
 386 {
 387         struct usb_wwan_port_private *portdata;
 388         struct usb_wwan_intf_private *intfdata;
 389         struct usb_serial *serial = port->serial;
 390         int i, err;
 391         struct urb *urb;
 392
 393         portdata = usb_get_serial_port_data(port);
 394         intfdata = serial->private;
 395
 396         /* Start reading from the IN endpoint */
 397         for (i = 0; i < N_IN_URB; i++) {
 398                 urb = portdata->in_urbs[i];
 399                 if (!urb)
 400                         continue;
 401                 err = usb_submit_urb(urb, GFP_KERNEL);
 402                 if (err) {
 403                         dev_dbg(&port->dev, "%s: submit urb %d failed (%d) %d\n",
 404                                 __func__, i, err, urb->transfer_buffer_length);
 405                 }
 406         }
 407
 408         if (intfdata->send_setup)
 409                 intfdata->send_setup(port);
 410
 411         serial->interface->needs_remote_wakeup = 1;
 412         spin_lock_irq(&intfdata->susp_lock);
 413         portdata->opened = 1;
 414         spin_unlock_irq(&intfdata->susp_lock);
 415         /* this balances a get in the generic USB serial code */
 416         usb_autopm_put_interface(serial->interface);
 417
 418         return 0;
 419 }
 420 EXPORT_SYMBOL(usb_wwan_open);
 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
 429         portdata = usb_get_serial_port_data(port);
 430
 431         if (serial->dev) {
 432                 /* Stop reading/writing urbs */
 433                 spin_lock_irq(&intfdata->susp_lock);
 434                 portdata->opened = 0;
 435                 spin_unlock_irq(&intfdata->susp_lock);
 436
 437                 for (i = 0; i < N_IN_URB; i++)
 438                         usb_kill_urb(portdata->in_urbs[i]);
 439                 for (i = 0; i < N_OUT_URB; i++)
 440                         usb_kill_urb(portdata->out_urbs[i]);
 441                 /* balancing - important as an error cannot be handled*/
 442                 usb_autopm_get_interface_no_resume(serial->interface);
 443                 serial->interface->needs_remote_wakeup = 0;
 444         }
 445 }
 446 EXPORT_SYMBOL(usb_wwan_close);
 447
 448 /* Helper functions used by usb_wwan_setup_urbs */
 449 static struct urb *usb_wwan_setup_urb(struct usb_serial_port *port,
 450                                       int endpoint,
 451                                       int dir, void *ctx, char *buf, int len,
 452                                       void (*callback) (struct urb *))
 453 {
 454         struct usb_serial *serial = port->serial;
 455         struct urb *urb;
 456
 457         urb = usb_alloc_urb(0, GFP_KERNEL);     /* No ISO */
 458         if (urb == NULL) {
 459                 dev_dbg(&serial->interface->dev,
 460                         "%s: alloc for endpoint %d failed.\n", __func__,
 461                         endpoint);
 462                 return NULL;
 463         }
 464
 465         /* Fill URB using supplied data. */
 466         usb_fill_bulk_urb(urb, serial->dev,
 467                           usb_sndbulkpipe(serial->dev, endpoint) | dir,
 468                           buf, len, callback, ctx);
 469
 470         return urb;
 471 }
 472
 473 int usb_wwan_port_probe(struct usb_serial_port *port)
 474 {
 475         struct usb_wwan_port_private *portdata;
 476         struct urb *urb;
 477         u8 *buffer;
 478         int err;
 479         int i;
 480
 481         portdata = kzalloc(sizeof(*portdata), GFP_KERNEL);
 482         if (!portdata)
 483                 return -ENOMEM;
 484
 485         init_usb_anchor(&portdata->delayed);
 486
 487         for (i = 0; i < N_IN_URB; i++) {
 488                 if (!port->bulk_in_size)
 489                         break;
 490
 491                 buffer = (u8 *)__get_free_page(GFP_KERNEL);
 492                 if (!buffer)
 493                         goto bail_out_error;
 494                 portdata->in_buffer[i] = buffer;
 495
 496                 urb = usb_wwan_setup_urb(port, port->bulk_in_endpointAddress,
 497                                                 USB_DIR_IN, port,
 498                                                 buffer, IN_BUFLEN,
 499                                                 usb_wwan_indat_callback);
 500                 portdata->in_urbs[i] = urb;
 501         }
 502
 503         for (i = 0; i < N_OUT_URB; i++) {
 504                 if (!port->bulk_out_size)
 505                         break;
 506
 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         if (port->interrupt_in_urb) {
 522                 err = usb_submit_urb(port->interrupt_in_urb, GFP_KERNEL);
 523                 if (err)
 524                         dev_dbg(&port->dev, "%s: submit irq_in urb failed %d\n",
 525                                 __func__, err);
 526         }
 527
 528         return 0;
 529
 530 bail_out_error2:
 531         for (i = 0; i < N_OUT_URB; i++) {
 532                 usb_free_urb(portdata->out_urbs[i]);
 533                 kfree(portdata->out_buffer[i]);
 534         }
 535 bail_out_error:
 536         for (i = 0; i < N_IN_URB; i++) {
 537                 usb_free_urb(portdata->in_urbs[i]);
 538                 free_page((unsigned long)portdata->in_buffer[i]);
 539         }
 540         kfree(portdata);
 541
 542         return -ENOMEM;
 543 }
 544 EXPORT_SYMBOL_GPL(usb_wwan_port_probe);
 545
 546 int usb_wwan_port_remove(struct usb_serial_port *port)
 547 {
 548         int i;
 549         struct usb_wwan_port_private *portdata;
 550
 551         portdata = usb_get_serial_port_data(port);
 552         usb_set_serial_port_data(port, NULL);
 553
 554         /* Stop reading/writing urbs and free them */
 555         for (i = 0; i < N_IN_URB; i++) {
 556                 usb_kill_urb(portdata->in_urbs[i]);
 557                 usb_free_urb(portdata->in_urbs[i]);
 558                 free_page((unsigned long)portdata->in_buffer[i]);
 559         }
 560         for (i = 0; i < N_OUT_URB; i++) {
 561                 usb_kill_urb(portdata->out_urbs[i]);
 562                 usb_free_urb(portdata->out_urbs[i]);
 563                 kfree(portdata->out_buffer[i]);
 564         }
 565
 566         /* Now free port private data */
 567         kfree(portdata);
 568         return 0;
 569 }
 570 EXPORT_SYMBOL(usb_wwan_port_remove);
 571
 572 #ifdef CONFIG_PM
 573 static void stop_read_write_urbs(struct usb_serial *serial)
 574 {
 575         int i, j;
 576         struct usb_serial_port *port;
 577         struct usb_wwan_port_private *portdata;
 578
 579         /* Stop reading/writing urbs */
 580         for (i = 0; i < serial->num_ports; ++i) {
 581                 port = serial->port[i];
 582                 portdata = usb_get_serial_port_data(port);
 583                 if (!portdata)
 584                         continue;
 585                 for (j = 0; j < N_IN_URB; j++)
 586                         usb_kill_urb(portdata->in_urbs[j]);
 587                 for (j = 0; j < N_OUT_URB; j++)
 588                         usb_kill_urb(portdata->out_urbs[j]);
 589         }
 590 }
 591
 592 int usb_wwan_suspend(struct usb_serial *serial, pm_message_t message)
 593 {
 594         struct usb_wwan_intf_private *intfdata = serial->private;
 595         int b;
 596
 597         if (PMSG_IS_AUTO(message)) {
 598                 spin_lock_irq(&intfdata->susp_lock);
 599                 b = intfdata->in_flight;
 600                 spin_unlock_irq(&intfdata->susp_lock);
 601
 602                 if (b)
 603                         return -EBUSY;
 604         }
 605
 606         spin_lock_irq(&intfdata->susp_lock);
 607         intfdata->suspended = 1;
 608         spin_unlock_irq(&intfdata->susp_lock);
 609         stop_read_write_urbs(serial);
 610
 611         return 0;
 612 }
 613 EXPORT_SYMBOL(usb_wwan_suspend);
 614
 615 static void unbusy_queued_urb(struct urb *urb, struct usb_wwan_port_private *portdata)
 616 {
 617         int i;
 618
 619         for (i = 0; i < N_OUT_URB; i++) {
 620                 if (urb == portdata->out_urbs[i]) {
 621                         clear_bit(i, &portdata->out_busy);
 622                         break;
 623                 }
 624         }
 625 }
 626
 627 static void play_delayed(struct usb_serial_port *port)
 628 {
 629         struct usb_wwan_intf_private *data;
 630         struct usb_wwan_port_private *portdata;
 631         struct urb *urb;
 632         int err;
 633
 634         portdata = usb_get_serial_port_data(port);
 635         data = port->serial->private;
 636         while ((urb = usb_get_from_anchor(&portdata->delayed))) {
 637                 err = usb_submit_urb(urb, GFP_ATOMIC);
 638                 if (!err) {
 639                         data->in_flight++;
 640                 } else {
 641                         /* we have to throw away the rest */
 642                         do {
 643                                 unbusy_queued_urb(urb, portdata);
 644                                 usb_autopm_put_interface_no_suspend(port->serial->interface);
 645                         } while ((urb = usb_get_from_anchor(&portdata->delayed)));
 646                         break;
 647                 }
 648         }
 649 }
 650
 651 int usb_wwan_resume(struct usb_serial *serial)
 652 {
 653         int i, j;
 654         struct usb_serial_port *port;
 655         struct usb_wwan_intf_private *intfdata = serial->private;
 656         struct usb_wwan_port_private *portdata;
 657         struct urb *urb;
 658         int err = 0;
 659
 660         /* get the interrupt URBs resubmitted unconditionally */
 661         for (i = 0; i < serial->num_ports; i++) {
 662                 port = serial->port[i];
 663                 if (!port->interrupt_in_urb) {
 664                         dev_dbg(&port->dev, "%s: No interrupt URB for port\n", __func__);
 665                         continue;
 666                 }
 667                 err = usb_submit_urb(port->interrupt_in_urb, GFP_NOIO);
 668                 dev_dbg(&port->dev, "Submitted interrupt URB for port (result %d)\n", err);
 669                 if (err < 0) {
 670                         dev_err(&port->dev, "%s: Error %d for interrupt URB\n",
 671                                 __func__, err);
 672                         goto err_out;
 673                 }
 674         }
 675
 676         for (i = 0; i < serial->num_ports; i++) {
 677                 /* walk all ports */
 678                 port = serial->port[i];
 679                 portdata = usb_get_serial_port_data(port);
 680
 681                 /* skip closed ports */
 682                 spin_lock_irq(&intfdata->susp_lock);
 683                 if (!portdata || !portdata->opened) {
 684                         spin_unlock_irq(&intfdata->susp_lock);
 685                         continue;
 686                 }
 687
 688                 for (j = 0; j < N_IN_URB; j++) {
 689                         urb = portdata->in_urbs[j];
 690                         err = usb_submit_urb(urb, GFP_ATOMIC);
 691                         if (err < 0) {
 692                                 dev_err(&port->dev, "%s: Error %d for bulk URB %d\n",
 693                                         __func__, err, i);
 694                                 spin_unlock_irq(&intfdata->susp_lock);
 695                                 goto err_out;
 696                         }
 697                 }
 698                 play_delayed(port);
 699                 spin_unlock_irq(&intfdata->susp_lock);
 700         }
 701         spin_lock_irq(&intfdata->susp_lock);
 702         intfdata->suspended = 0;
 703         spin_unlock_irq(&intfdata->susp_lock);
 704 err_out:
 705         return err;
 706 }
 707 EXPORT_SYMBOL(usb_wwan_resume);
 708 #endif
 709
 710 MODULE_AUTHOR(DRIVER_AUTHOR);
 711 MODULE_DESCRIPTION(DRIVER_DESC);
 712 MODULE_LICENSE("GPL");