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_VERSION "v0.7.2"
  23 #define DRIVER_AUTHOR "Matthias Urlichs <smurf@smurf.noris.de>"
  24 #define DRIVER_DESC "USB Driver for GSM modems"
  25
  26 #include <linux/kernel.h>
  27 #include <linux/jiffies.h>
  28 #include <linux/errno.h>
  29 #include <linux/slab.h>
  30 #include <linux/tty.h>
  31 #include <linux/tty_flip.h>
  32 #include <linux/module.h>
  33 #include <linux/bitops.h>
  34 #include <linux/uaccess.h>
  35 #include <linux/usb.h>
  36 #include <linux/usb/serial.h>
  37 #include <linux/serial.h>
  38 #include "usb-wwan.h"
  39
  40 static bool debug;
  41
  42 void usb_wwan_dtr_rts(struct usb_serial_port *port, int on)
  43 {
  44         struct usb_serial *serial = port->serial;
  45         struct usb_wwan_port_private *portdata;
  46         struct usb_wwan_intf_private *intfdata;
  47
  48         intfdata = port->serial->private;
  49
  50         if (!intfdata->send_setup)
  51                 return;
  52
  53         portdata = usb_get_serial_port_data(port);
  54         mutex_lock(&serial->disc_mutex);
  55         portdata->rts_state = on;
  56         portdata->dtr_state = on;
  57         if (serial->dev)
  58                 intfdata->send_setup(port);
  59         mutex_unlock(&serial->disc_mutex);
  60 }
  61 EXPORT_SYMBOL(usb_wwan_dtr_rts);
  62
  63 void usb_wwan_set_termios(struct tty_struct *tty,
  64                           struct usb_serial_port *port,
  65                           struct ktermios *old_termios)
  66 {
  67         struct usb_wwan_intf_private *intfdata = port->serial->private;
  68
  69         /* Doesn't support option setting */
  70         tty_termios_copy_hw(tty->termios, old_termios);
  71
  72         if (intfdata->send_setup)
  73                 intfdata->send_setup(port);
  74 }
  75 EXPORT_SYMBOL(usb_wwan_set_termios);
  76
  77 int usb_wwan_tiocmget(struct tty_struct *tty)
  78 {
  79         struct usb_serial_port *port = tty->driver_data;
  80         unsigned int value;
  81         struct usb_wwan_port_private *portdata;
  82
  83         portdata = usb_get_serial_port_data(port);
  84
  85         value = ((portdata->rts_state) ? TIOCM_RTS : 0) |
  86             ((portdata->dtr_state) ? TIOCM_DTR : 0) |
  87             ((portdata->cts_state) ? TIOCM_CTS : 0) |
  88             ((portdata->dsr_state) ? TIOCM_DSR : 0) |
  89             ((portdata->dcd_state) ? TIOCM_CAR : 0) |
  90             ((portdata->ri_state) ? TIOCM_RNG : 0);
  91
  92         return value;
  93 }
  94 EXPORT_SYMBOL(usb_wwan_tiocmget);
  95
  96 int usb_wwan_tiocmset(struct tty_struct *tty,
  97                       unsigned int set, unsigned int clear)
  98 {
  99         struct usb_serial_port *port = tty->driver_data;
 100         struct usb_wwan_port_private *portdata;
 101         struct usb_wwan_intf_private *intfdata;
 102
 103         portdata = usb_get_serial_port_data(port);
 104         intfdata = port->serial->private;
 105
 106         if (!intfdata->send_setup)
 107                 return -EINVAL;
 108
 109         /* FIXME: what locks portdata fields ? */
 110         if (set & TIOCM_RTS)
 111                 portdata->rts_state = 1;
 112         if (set & TIOCM_DTR)
 113                 portdata->dtr_state = 1;
 114
 115         if (clear & TIOCM_RTS)
 116                 portdata->rts_state = 0;
 117         if (clear & TIOCM_DTR)
 118                 portdata->dtr_state = 0;
 119         return intfdata->send_setup(port);
 120 }
 121 EXPORT_SYMBOL(usb_wwan_tiocmset);
 122
 123 static int get_serial_info(struct usb_serial_port *port,
 124                            struct serial_struct __user *retinfo)
 125 {
 126         struct serial_struct tmp;
 127
 128         if (!retinfo)
 129                 return -EFAULT;
 130
 131         memset(&tmp, 0, sizeof(tmp));
 132         tmp.line            = port->serial->minor;
 133         tmp.port            = port->number;
 134         tmp.baud_base       = tty_get_baud_rate(port->port.tty);
 135         tmp.close_delay     = port->port.close_delay / 10;
 136         tmp.closing_wait    = port->port.closing_wait == ASYNC_CLOSING_WAIT_NONE ?
 137                                  ASYNC_CLOSING_WAIT_NONE :
 138                                  port->port.closing_wait / 10;
 139
 140         if (copy_to_user(retinfo, &tmp, sizeof(*retinfo)))
 141                 return -EFAULT;
 142         return 0;
 143 }
 144
 145 static int set_serial_info(struct usb_serial_port *port,
 146                            struct serial_struct __user *newinfo)
 147 {
 148         struct serial_struct new_serial;
 149         unsigned int closing_wait, close_delay;
 150         int retval = 0;
 151
 152         if (copy_from_user(&new_serial, newinfo, sizeof(new_serial)))
 153                 return -EFAULT;
 154
 155         close_delay = new_serial.close_delay * 10;
 156         closing_wait = new_serial.closing_wait == ASYNC_CLOSING_WAIT_NONE ?
 157                         ASYNC_CLOSING_WAIT_NONE : new_serial.closing_wait * 10;
 158
 159         mutex_lock(&port->port.mutex);
 160
 161         if (!capable(CAP_SYS_ADMIN)) {
 162                 if ((close_delay != port->port.close_delay) ||
 163                     (closing_wait != port->port.closing_wait))
 164                         retval = -EPERM;
 165                 else
 166                         retval = -EOPNOTSUPP;
 167         } else {
 168                 port->port.close_delay  = close_delay;
 169                 port->port.closing_wait = closing_wait;
 170         }
 171
 172         mutex_unlock(&port->port.mutex);
 173         return retval;
 174 }
 175
 176 int usb_wwan_ioctl(struct tty_struct *tty,
 177                    unsigned int cmd, unsigned long arg)
 178 {
 179         struct usb_serial_port *port = tty->driver_data;
 180
 181         dbg("%s cmd 0x%04x", __func__, cmd);
 182
 183         switch (cmd) {
 184         case TIOCGSERIAL:
 185                 return get_serial_info(port,
 186                                        (struct serial_struct __user *) arg);
 187         case TIOCSSERIAL:
 188                 return set_serial_info(port,
 189                                        (struct serial_struct __user *) arg);
 190         default:
 191                 break;
 192         }
 193
 194         dbg("%s arg not supported", __func__);
 195
 196         return -ENOIOCTLCMD;
 197 }
 198 EXPORT_SYMBOL(usb_wwan_ioctl);
 199
 200 /* Write */
 201 int usb_wwan_write(struct tty_struct *tty, struct usb_serial_port *port,
 202                    const unsigned char *buf, int count)
 203 {
 204         struct usb_wwan_port_private *portdata;
 205         struct usb_wwan_intf_private *intfdata;
 206         int i;
 207         int left, todo;
 208         struct urb *this_urb = NULL;    /* spurious */
 209         int err;
 210         unsigned long flags;
 211
 212         portdata = usb_get_serial_port_data(port);
 213         intfdata = port->serial->private;
 214
 215         dbg("%s: write (%d chars)", __func__, count);
 216
 217         i = 0;
 218         left = count;
 219         for (i = 0; left > 0 && i < N_OUT_URB; i++) {
 220                 todo = left;
 221                 if (todo > OUT_BUFLEN)
 222                         todo = OUT_BUFLEN;
 223
 224                 this_urb = portdata->out_urbs[i];
 225                 if (test_and_set_bit(i, &portdata->out_busy)) {
 226                         if (time_before(jiffies,
 227                                         portdata->tx_start_time[i] + 10 * HZ))
 228                                 continue;
 229                         usb_unlink_urb(this_urb);
 230                         continue;
 231                 }
 232                 dbg("%s: endpoint %d buf %d", __func__,
 233                     usb_pipeendpoint(this_urb->pipe), i);
 234
 235                 err = usb_autopm_get_interface_async(port->serial->interface);
 236                 if (err < 0)
 237                         break;
 238
 239                 /* send the data */
 240                 memcpy(this_urb->transfer_buffer, buf, todo);
 241                 this_urb->transfer_buffer_length = todo;
 242
 243                 spin_lock_irqsave(&intfdata->susp_lock, flags);
 244                 if (intfdata->suspended) {
 245                         usb_anchor_urb(this_urb, &portdata->delayed);
 246                         spin_unlock_irqrestore(&intfdata->susp_lock, flags);
 247                 } else {
 248                         intfdata->in_flight++;
 249                         spin_unlock_irqrestore(&intfdata->susp_lock, flags);
 250                         err = usb_submit_urb(this_urb, GFP_ATOMIC);
 251                         if (err) {
 252                                 dbg("usb_submit_urb %p (write bulk) failed "
 253                                     "(%d)", this_urb, err);
 254                                 clear_bit(i, &portdata->out_busy);
 255                                 spin_lock_irqsave(&intfdata->susp_lock, flags);
 256                                 intfdata->in_flight--;
 257                                 spin_unlock_irqrestore(&intfdata->susp_lock,
 258                                                        flags);
 259                                 usb_autopm_put_interface_async(port->serial->interface);
 260                                 break;
 261                         }
 262                 }
 263
 264                 portdata->tx_start_time[i] = jiffies;
 265                 buf += todo;
 266                 left -= todo;
 267         }
 268
 269         count -= left;
 270         dbg("%s: wrote (did %d)", __func__, count);
 271         return count;
 272 }
 273 EXPORT_SYMBOL(usb_wwan_write);
 274
 275 static void usb_wwan_indat_callback(struct urb *urb)
 276 {
 277         int err;
 278         int endpoint;
 279         struct usb_serial_port *port;
 280         struct tty_struct *tty;
 281         unsigned char *data = urb->transfer_buffer;
 282         int status = urb->status;
 283
 284         endpoint = usb_pipeendpoint(urb->pipe);
 285         port = urb->context;
 286
 287         if (status) {
 288                 dbg("%s: nonzero status: %d on endpoint %02x.",
 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(tty, data,
 295                                                 urb->actual_length);
 296                                 tty_flip_buffer_push(tty);
 297                         } else
 298                                 dbg("%s: empty read urb received", __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                                 printk(KERN_ERR "%s: resubmit read urb failed. "
 307                                         "(%d)", __func__, err);
 308                                 /* busy also in error unless we are killed */
 309                                 usb_mark_last_busy(port->serial->dev);
 310                         }
 311                 } else {
 312                         usb_mark_last_busy(port->serial->dev);
 313                 }
 314         }
 315 }
 316
 317 static void usb_wwan_outdat_callback(struct urb *urb)
 318 {
 319         struct usb_serial_port *port;
 320         struct usb_wwan_port_private *portdata;
 321         struct usb_wwan_intf_private *intfdata;
 322         int i;
 323
 324         port = urb->context;
 325         intfdata = port->serial->private;
 326
 327         usb_serial_port_softint(port);
 328         usb_autopm_put_interface_async(port->serial->interface);
 329         portdata = usb_get_serial_port_data(port);
 330         spin_lock(&intfdata->susp_lock);
 331         intfdata->in_flight--;
 332         spin_unlock(&intfdata->susp_lock);
 333
 334         for (i = 0; i < N_OUT_URB; ++i) {
 335                 if (portdata->out_urbs[i] == urb) {
 336                         smp_mb__before_clear_bit();
 337                         clear_bit(i, &portdata->out_busy);
 338                         break;
 339                 }
 340         }
 341 }
 342
 343 int usb_wwan_write_room(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                 if (this_urb && !test_bit(i, &portdata->out_busy))
 356                         data_len += OUT_BUFLEN;
 357         }
 358
 359         dbg("%s: %d", __func__, data_len);
 360         return data_len;
 361 }
 362 EXPORT_SYMBOL(usb_wwan_write_room);
 363
 364 int usb_wwan_chars_in_buffer(struct tty_struct *tty)
 365 {
 366         struct usb_serial_port *port = tty->driver_data;
 367         struct usb_wwan_port_private *portdata;
 368         int i;
 369         int data_len = 0;
 370         struct urb *this_urb;
 371
 372         portdata = usb_get_serial_port_data(port);
 373
 374         for (i = 0; i < N_OUT_URB; i++) {
 375                 this_urb = portdata->out_urbs[i];
 376                 /* FIXME: This locking is insufficient as this_urb may
 377                    go unused during the test */
 378                 if (this_urb && test_bit(i, &portdata->out_busy))
 379                         data_len += this_urb->transfer_buffer_length;
 380         }
 381         dbg("%s: %d", __func__, data_len);
 382         return data_len;
 383 }
 384 EXPORT_SYMBOL(usb_wwan_chars_in_buffer);
 385
 386 int usb_wwan_open(struct tty_struct *tty, struct usb_serial_port *port)
 387 {
 388         struct usb_wwan_port_private *portdata;
 389         struct usb_wwan_intf_private *intfdata;
 390         struct usb_serial *serial = port->serial;
 391         int i, err;
 392         struct urb *urb;
 393
 394         portdata = usb_get_serial_port_data(port);
 395         intfdata = serial->private;
 396
 397         /* Start reading from the IN endpoint */
 398         for (i = 0; i < N_IN_URB; i++) {
 399                 urb = portdata->in_urbs[i];
 400                 if (!urb)
 401                         continue;
 402                 err = usb_submit_urb(urb, GFP_KERNEL);
 403                 if (err) {
 404                         dbg("%s: submit urb %d failed (%d) %d",
 405                             __func__, i, err, urb->transfer_buffer_length);
 406                 }
 407         }
 408
 409         if (intfdata->send_setup)
 410                 intfdata->send_setup(port);
 411
 412         serial->interface->needs_remote_wakeup = 1;
 413         spin_lock_irq(&intfdata->susp_lock);
 414         portdata->opened = 1;
 415         spin_unlock_irq(&intfdata->susp_lock);
 416         /* this balances a get in the generic USB serial code */
 417         usb_autopm_put_interface(serial->interface);
 418
 419         return 0;
 420 }
 421 EXPORT_SYMBOL(usb_wwan_open);
 422
 423 void usb_wwan_close(struct usb_serial_port *port)
 424 {
 425         int i;
 426         struct usb_serial *serial = port->serial;
 427         struct usb_wwan_port_private *portdata;
 428         struct usb_wwan_intf_private *intfdata = port->serial->private;
 429
 430         portdata = usb_get_serial_port_data(port);
 431
 432         if (serial->dev) {
 433                 /* Stop reading/writing urbs */
 434                 spin_lock_irq(&intfdata->susp_lock);
 435                 portdata->opened = 0;
 436                 spin_unlock_irq(&intfdata->susp_lock);
 437
 438                 for (i = 0; i < N_IN_URB; i++)
 439                         usb_kill_urb(portdata->in_urbs[i]);
 440                 for (i = 0; i < N_OUT_URB; i++)
 441                         usb_kill_urb(portdata->out_urbs[i]);
 442                 /* balancing - important as an error cannot be handled*/
 443                 usb_autopm_get_interface_no_resume(serial->interface);
 444                 serial->interface->needs_remote_wakeup = 0;
 445         }
 446 }
 447 EXPORT_SYMBOL(usb_wwan_close);
 448
 449 /* Helper functions used by usb_wwan_setup_urbs */
 450 static struct urb *usb_wwan_setup_urb(struct usb_serial *serial, int endpoint,
 451                                       int dir, void *ctx, char *buf, int len,
 452                                       void (*callback) (struct urb *))
 453 {
 454         struct urb *urb;
 455
 456         if (endpoint == -1)
 457                 return NULL;    /* endpoint not needed */
 458
 459         urb = usb_alloc_urb(0, GFP_KERNEL);     /* No ISO */
 460         if (urb == NULL) {
 461                 dbg("%s: alloc for endpoint %d failed.", __func__, 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 /* Setup urbs */
 474 static void usb_wwan_setup_urbs(struct usb_serial *serial)
 475 {
 476         int i, j;
 477         struct usb_serial_port *port;
 478         struct usb_wwan_port_private *portdata;
 479
 480         for (i = 0; i < serial->num_ports; i++) {
 481                 port = serial->port[i];
 482                 portdata = usb_get_serial_port_data(port);
 483
 484                 /* Do indat endpoints first */
 485                 for (j = 0; j < N_IN_URB; ++j) {
 486                         portdata->in_urbs[j] = usb_wwan_setup_urb(serial,
 487                                                                   port->
 488                                                                   bulk_in_endpointAddress,
 489                                                                   USB_DIR_IN,
 490                                                                   port,
 491                                                                   portdata->
 492                                                                   in_buffer[j],
 493                                                                   IN_BUFLEN,
 494                                                                   usb_wwan_indat_callback);
 495                 }
 496
 497                 /* outdat endpoints */
 498                 for (j = 0; j < N_OUT_URB; ++j) {
 499                         portdata->out_urbs[j] = usb_wwan_setup_urb(serial,
 500                                                                    port->
 501                                                                    bulk_out_endpointAddress,
 502                                                                    USB_DIR_OUT,
 503                                                                    port,
 504                                                                    portdata->
 505                                                                    out_buffer
 506                                                                    [j],
 507                                                                    OUT_BUFLEN,
 508                                                                    usb_wwan_outdat_callback);
 509                 }
 510         }
 511 }
 512
 513 int usb_wwan_startup(struct usb_serial *serial)
 514 {
 515         int i, j, err;
 516         struct usb_serial_port *port;
 517         struct usb_wwan_port_private *portdata;
 518         u8 *buffer;
 519
 520         /* Now setup per port private data */
 521         for (i = 0; i < serial->num_ports; i++) {
 522                 port = serial->port[i];
 523                 portdata = kzalloc(sizeof(*portdata), GFP_KERNEL);
 524                 if (!portdata) {
 525                         dbg("%s: kmalloc for usb_wwan_port_private (%d) failed!.",
 526                             __func__, i);
 527                         return 1;
 528                 }
 529                 init_usb_anchor(&portdata->delayed);
 530
 531                 for (j = 0; j < N_IN_URB; j++) {
 532                         buffer = (u8 *) __get_free_page(GFP_KERNEL);
 533                         if (!buffer)
 534                                 goto bail_out_error;
 535                         portdata->in_buffer[j] = buffer;
 536                 }
 537
 538                 for (j = 0; j < N_OUT_URB; j++) {
 539                         buffer = kmalloc(OUT_BUFLEN, GFP_KERNEL);
 540                         if (!buffer)
 541                                 goto bail_out_error2;
 542                         portdata->out_buffer[j] = buffer;
 543                 }
 544
 545                 usb_set_serial_port_data(port, portdata);
 546
 547                 if (!port->interrupt_in_urb)
 548                         continue;
 549                 err = usb_submit_urb(port->interrupt_in_urb, GFP_KERNEL);
 550                 if (err)
 551                         dbg("%s: submit irq_in urb failed %d", __func__, err);
 552         }
 553         usb_wwan_setup_urbs(serial);
 554         return 0;
 555
 556 bail_out_error2:
 557         for (j = 0; j < N_OUT_URB; j++)
 558                 kfree(portdata->out_buffer[j]);
 559 bail_out_error:
 560         for (j = 0; j < N_IN_URB; j++)
 561                 if (portdata->in_buffer[j])
 562                         free_page((unsigned long)portdata->in_buffer[j]);
 563         kfree(portdata);
 564         return 1;
 565 }
 566 EXPORT_SYMBOL(usb_wwan_startup);
 567
 568 int usb_wwan_port_remove(struct usb_serial_port *port)
 569 {
 570         int i;
 571         struct usb_wwan_port_private *portdata;
 572
 573         portdata = usb_get_serial_port_data(port);
 574         usb_set_serial_port_data(port, NULL);
 575
 576         /* Stop reading/writing urbs and free them */
 577         for (i = 0; i < N_IN_URB; i++) {
 578                 usb_kill_urb(portdata->in_urbs[i]);
 579                 usb_free_urb(portdata->in_urbs[i]);
 580                 free_page((unsigned long)portdata->in_buffer[i]);
 581         }
 582         for (i = 0; i < N_OUT_URB; i++) {
 583                 usb_kill_urb(portdata->out_urbs[i]);
 584                 usb_free_urb(portdata->out_urbs[i]);
 585                 kfree(portdata->out_buffer[i]);
 586         }
 587
 588         /* Now free port private data */
 589         kfree(portdata);
 590         return 0;
 591 }
 592 EXPORT_SYMBOL(usb_wwan_port_remove);
 593
 594 #ifdef CONFIG_PM
 595 static void stop_read_write_urbs(struct usb_serial *serial)
 596 {
 597         int i, j;
 598         struct usb_serial_port *port;
 599         struct usb_wwan_port_private *portdata;
 600
 601         /* Stop reading/writing urbs */
 602         for (i = 0; i < serial->num_ports; ++i) {
 603                 port = serial->port[i];
 604                 portdata = usb_get_serial_port_data(port);
 605                 if (!portdata)
 606                         continue;
 607                 for (j = 0; j < N_IN_URB; j++)
 608                         usb_kill_urb(portdata->in_urbs[j]);
 609                 for (j = 0; j < N_OUT_URB; j++)
 610                         usb_kill_urb(portdata->out_urbs[j]);
 611         }
 612 }
 613
 614 int usb_wwan_suspend(struct usb_serial *serial, pm_message_t message)
 615 {
 616         struct usb_wwan_intf_private *intfdata = serial->private;
 617         int b;
 618
 619         if (PMSG_IS_AUTO(message)) {
 620                 spin_lock_irq(&intfdata->susp_lock);
 621                 b = intfdata->in_flight;
 622                 spin_unlock_irq(&intfdata->susp_lock);
 623
 624                 if (b)
 625                         return -EBUSY;
 626         }
 627
 628         spin_lock_irq(&intfdata->susp_lock);
 629         intfdata->suspended = 1;
 630         spin_unlock_irq(&intfdata->susp_lock);
 631         stop_read_write_urbs(serial);
 632
 633         return 0;
 634 }
 635 EXPORT_SYMBOL(usb_wwan_suspend);
 636
 637 static void unbusy_queued_urb(struct urb *urb, struct usb_wwan_port_private *portdata)
 638 {
 639         int i;
 640
 641         for (i = 0; i < N_OUT_URB; i++) {
 642                 if (urb == portdata->out_urbs[i]) {
 643                         clear_bit(i, &portdata->out_busy);
 644                         break;
 645                 }
 646         }
 647 }
 648
 649 static void play_delayed(struct usb_serial_port *port)
 650 {
 651         struct usb_wwan_intf_private *data;
 652         struct usb_wwan_port_private *portdata;
 653         struct urb *urb;
 654         int err;
 655
 656         portdata = usb_get_serial_port_data(port);
 657         data = port->serial->private;
 658         while ((urb = usb_get_from_anchor(&portdata->delayed))) {
 659                 err = usb_submit_urb(urb, GFP_ATOMIC);
 660                 if (!err) {
 661                         data->in_flight++;
 662                 } else {
 663                         /* we have to throw away the rest */
 664                         do {
 665                                 unbusy_queued_urb(urb, portdata);
 666                                 usb_autopm_put_interface_no_suspend(port->serial->interface);
 667                         } while ((urb = usb_get_from_anchor(&portdata->delayed)));
 668                         break;
 669                 }
 670         }
 671 }
 672
 673 int usb_wwan_resume(struct usb_serial *serial)
 674 {
 675         int i, j;
 676         struct usb_serial_port *port;
 677         struct usb_wwan_intf_private *intfdata = serial->private;
 678         struct usb_wwan_port_private *portdata;
 679         struct urb *urb;
 680         int err = 0;
 681
 682         /* get the interrupt URBs resubmitted unconditionally */
 683         for (i = 0; i < serial->num_ports; i++) {
 684                 port = serial->port[i];
 685                 if (!port->interrupt_in_urb) {
 686                         dbg("%s: No interrupt URB for port %d", __func__, i);
 687                         continue;
 688                 }
 689                 err = usb_submit_urb(port->interrupt_in_urb, GFP_NOIO);
 690                 dbg("Submitted interrupt URB for port %d (result %d)", i, err);
 691                 if (err < 0) {
 692                         dev_err(&port->dev, "%s: Error %d for interrupt URB\n",
 693                                 __func__, err);
 694                         goto err_out;
 695                 }
 696         }
 697
 698         for (i = 0; i < serial->num_ports; i++) {
 699                 /* walk all ports */
 700                 port = serial->port[i];
 701                 portdata = usb_get_serial_port_data(port);
 702
 703                 /* skip closed ports */
 704                 spin_lock_irq(&intfdata->susp_lock);
 705                 if (!portdata || !portdata->opened) {
 706                         spin_unlock_irq(&intfdata->susp_lock);
 707                         continue;
 708                 }
 709
 710                 for (j = 0; j < N_IN_URB; j++) {
 711                         urb = portdata->in_urbs[j];
 712                         err = usb_submit_urb(urb, GFP_ATOMIC);
 713                         if (err < 0) {
 714                                 dev_err(&port->dev, "%s: Error %d for bulk URB %d\n",
 715                                         __func__, err, i);
 716                                 spin_unlock_irq(&intfdata->susp_lock);
 717                                 goto err_out;
 718                         }
 719                 }
 720                 play_delayed(port);
 721                 spin_unlock_irq(&intfdata->susp_lock);
 722         }
 723         spin_lock_irq(&intfdata->susp_lock);
 724         intfdata->suspended = 0;
 725         spin_unlock_irq(&intfdata->susp_lock);
 726 err_out:
 727         return err;
 728 }
 729 EXPORT_SYMBOL(usb_wwan_resume);
 730 #endif
 731
 732 MODULE_AUTHOR(DRIVER_AUTHOR);
 733 MODULE_DESCRIPTION(DRIVER_DESC);
 734 MODULE_VERSION(DRIVER_VERSION);
 735 MODULE_LICENSE("GPL");
 736
 737 module_param(debug, bool, S_IRUGO | S_IWUSR);
 738 MODULE_PARM_DESC(debug, "Debug messages");