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 int 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
  47         struct usb_wwan_intf_private *intfdata;
  48
  49         dbg("%s", __func__);
  50
  51         intfdata = port->serial->private;
  52
  53         if (!intfdata->send_setup)
  54                 return;
  55
  56         portdata = usb_get_serial_port_data(port);
  57         mutex_lock(&serial->disc_mutex);
  58         portdata->rts_state = on;
  59         portdata->dtr_state = on;
  60         if (serial->dev)
  61                 intfdata->send_setup(port);
  62         mutex_unlock(&serial->disc_mutex);
  63 }
  64 EXPORT_SYMBOL(usb_wwan_dtr_rts);
  65
  66 void usb_wwan_set_termios(struct tty_struct *tty,
  67                           struct usb_serial_port *port,
  68                           struct ktermios *old_termios)
  69 {
  70         struct usb_wwan_intf_private *intfdata = port->serial->private;
  71
  72         dbg("%s", __func__);
  73
  74         /* Doesn't support option setting */
  75         tty_termios_copy_hw(tty->termios, old_termios);
  76
  77         if (intfdata->send_setup)
  78                 intfdata->send_setup(port);
  79 }
  80 EXPORT_SYMBOL(usb_wwan_set_termios);
  81
  82 int usb_wwan_tiocmget(struct tty_struct *tty, struct file *file)
  83 {
  84         struct usb_serial_port *port = tty->driver_data;
  85         unsigned int value;
  86         struct usb_wwan_port_private *portdata;
  87
  88         portdata = usb_get_serial_port_data(port);
  89
  90         value = ((portdata->rts_state) ? TIOCM_RTS : 0) |
  91             ((portdata->dtr_state) ? TIOCM_DTR : 0) |
  92             ((portdata->cts_state) ? TIOCM_CTS : 0) |
  93             ((portdata->dsr_state) ? TIOCM_DSR : 0) |
  94             ((portdata->dcd_state) ? TIOCM_CAR : 0) |
  95             ((portdata->ri_state) ? TIOCM_RNG : 0);
  96
  97         return value;
  98 }
  99 EXPORT_SYMBOL(usb_wwan_tiocmget);
 100
 101 int usb_wwan_tiocmset(struct tty_struct *tty, struct file *file,
 102                       unsigned int set, unsigned int clear)
 103 {
 104         struct usb_serial_port *port = tty->driver_data;
 105         struct usb_wwan_port_private *portdata;
 106         struct usb_wwan_intf_private *intfdata;
 107
 108         portdata = usb_get_serial_port_data(port);
 109         intfdata = port->serial->private;
 110
 111         if (!intfdata->send_setup)
 112                 return -EINVAL;
 113
 114         /* FIXME: what locks portdata fields ? */
 115         if (set & TIOCM_RTS)
 116                 portdata->rts_state = 1;
 117         if (set & TIOCM_DTR)
 118                 portdata->dtr_state = 1;
 119
 120         if (clear & TIOCM_RTS)
 121                 portdata->rts_state = 0;
 122         if (clear & TIOCM_DTR)
 123                 portdata->dtr_state = 0;
 124         return intfdata->send_setup(port);
 125 }
 126 EXPORT_SYMBOL(usb_wwan_tiocmset);
 127
 128 static int get_serial_info(struct usb_serial_port *port,
 129                            struct serial_struct __user *retinfo)
 130 {
 131         struct serial_struct tmp;
 132
 133         if (!retinfo)
 134                 return -EFAULT;
 135
 136         memset(&tmp, 0, sizeof(tmp));
 137         tmp.line            = port->serial->minor;
 138         tmp.port            = port->number;
 139         tmp.baud_base       = tty_get_baud_rate(port->port.tty);
 140         tmp.close_delay     = port->port.close_delay / 10;
 141         tmp.closing_wait    = port->port.closing_wait == ASYNC_CLOSING_WAIT_NONE ?
 142                                  ASYNC_CLOSING_WAIT_NONE :
 143                                  port->port.closing_wait / 10;
 144
 145         if (copy_to_user(retinfo, &tmp, sizeof(*retinfo)))
 146                 return -EFAULT;
 147         return 0;
 148 }
 149
 150 static int set_serial_info(struct usb_serial_port *port,
 151                            struct serial_struct __user *newinfo)
 152 {
 153         struct serial_struct new_serial;
 154         unsigned int closing_wait, close_delay;
 155         int retval = 0;
 156
 157         if (copy_from_user(&new_serial, newinfo, sizeof(new_serial)))
 158                 return -EFAULT;
 159
 160         close_delay = new_serial.close_delay * 10;
 161         closing_wait = new_serial.closing_wait == ASYNC_CLOSING_WAIT_NONE ?
 162                         ASYNC_CLOSING_WAIT_NONE : new_serial.closing_wait * 10;
 163
 164         mutex_lock(&port->port.mutex);
 165
 166         if (!capable(CAP_SYS_ADMIN)) {
 167                 if ((close_delay != port->port.close_delay) ||
 168                     (closing_wait != port->port.closing_wait))
 169                         retval = -EPERM;
 170                 else
 171                         retval = -EOPNOTSUPP;
 172         } else {
 173                 port->port.close_delay  = close_delay;
 174                 port->port.closing_wait = closing_wait;
 175         }
 176
 177         mutex_unlock(&port->port.mutex);
 178         return retval;
 179 }
 180
 181 int usb_wwan_ioctl(struct tty_struct *tty, struct file *file,
 182                    unsigned int cmd, unsigned long arg)
 183 {
 184         struct usb_serial_port *port = tty->driver_data;
 185
 186         dbg("%s cmd 0x%04x", __func__, cmd);
 187
 188         switch (cmd) {
 189         case TIOCGSERIAL:
 190                 return get_serial_info(port,
 191                                        (struct serial_struct __user *) arg);
 192         case TIOCSSERIAL:
 193                 return set_serial_info(port,
 194                                        (struct serial_struct __user *) arg);
 195         default:
 196                 break;
 197         }
 198
 199         dbg("%s arg not supported", __func__);
 200
 201         return -ENOIOCTLCMD;
 202 }
 203 EXPORT_SYMBOL(usb_wwan_ioctl);
 204
 205 /* Write */
 206 int usb_wwan_write(struct tty_struct *tty, struct usb_serial_port *port,
 207                    const unsigned char *buf, int count)
 208 {
 209         struct usb_wwan_port_private *portdata;
 210         struct usb_wwan_intf_private *intfdata;
 211         int i;
 212         int left, todo;
 213         struct urb *this_urb = NULL;    /* spurious */
 214         int err;
 215         unsigned long flags;
 216
 217         portdata = usb_get_serial_port_data(port);
 218         intfdata = port->serial->private;
 219
 220         dbg("%s: write (%d chars)", __func__, count);
 221
 222         i = 0;
 223         left = count;
 224         for (i = 0; left > 0 && i < N_OUT_URB; i++) {
 225                 todo = left;
 226                 if (todo > OUT_BUFLEN)
 227                         todo = OUT_BUFLEN;
 228
 229                 this_urb = portdata->out_urbs[i];
 230                 if (test_and_set_bit(i, &portdata->out_busy)) {
 231                         if (time_before(jiffies,
 232                                         portdata->tx_start_time[i] + 10 * HZ))
 233                                 continue;
 234                         usb_unlink_urb(this_urb);
 235                         continue;
 236                 }
 237                 dbg("%s: endpoint %d buf %d", __func__,
 238                     usb_pipeendpoint(this_urb->pipe), i);
 239
 240                 err = usb_autopm_get_interface_async(port->serial->interface);
 241                 if (err < 0)
 242                         break;
 243
 244                 /* send the data */
 245                 memcpy(this_urb->transfer_buffer, buf, todo);
 246                 this_urb->transfer_buffer_length = todo;
 247
 248                 spin_lock_irqsave(&intfdata->susp_lock, flags);
 249                 if (intfdata->suspended) {
 250                         usb_anchor_urb(this_urb, &portdata->delayed);
 251                         spin_unlock_irqrestore(&intfdata->susp_lock, flags);
 252                 } else {
 253                         intfdata->in_flight++;
 254                         spin_unlock_irqrestore(&intfdata->susp_lock, flags);
 255                         err = usb_submit_urb(this_urb, GFP_ATOMIC);
 256                         if (err) {
 257                                 dbg("usb_submit_urb %p (write bulk) failed "
 258                                     "(%d)", this_urb, err);
 259                                 clear_bit(i, &portdata->out_busy);
 260                                 spin_lock_irqsave(&intfdata->susp_lock, flags);
 261                                 intfdata->in_flight--;
 262                                 spin_unlock_irqrestore(&intfdata->susp_lock,
 263                                                        flags);
 264                                 continue;
 265                         }
 266                 }
 267
 268                 portdata->tx_start_time[i] = jiffies;
 269                 buf += todo;
 270                 left -= todo;
 271         }
 272
 273         count -= left;
 274         dbg("%s: wrote (did %d)", __func__, count);
 275         return count;
 276 }
 277 EXPORT_SYMBOL(usb_wwan_write);
 278
 279 static void usb_wwan_indat_callback(struct urb *urb)
 280 {
 281         int err;
 282         int endpoint;
 283         struct usb_serial_port *port;
 284         struct tty_struct *tty;
 285         unsigned char *data = urb->transfer_buffer;
 286         int status = urb->status;
 287
 288         dbg("%s: %p", __func__, urb);
 289
 290         endpoint = usb_pipeendpoint(urb->pipe);
 291         port = urb->context;
 292
 293         if (status) {
 294                 dbg("%s: nonzero status: %d on endpoint %02x.",
 295                     __func__, status, endpoint);
 296         } else {
 297                 tty = tty_port_tty_get(&port->port);
 298                 if (urb->actual_length) {
 299                         tty_insert_flip_string(tty, data, urb->actual_length);
 300                         tty_flip_buffer_push(tty);
 301                 } else
 302                         dbg("%s: empty read urb received", __func__);
 303                 tty_kref_put(tty);
 304
 305                 /* Resubmit urb so we continue receiving */
 306                 if (status != -ESHUTDOWN) {
 307                         err = usb_submit_urb(urb, GFP_ATOMIC);
 308                         if (err && err != -EPERM)
 309                                 printk(KERN_ERR "%s: resubmit read urb failed. "
 310                                        "(%d)", __func__, err);
 311                         else
 312                                 usb_mark_last_busy(port->serial->dev);
 313                 }
 314
 315         }
 316 }
 317
 318 static void usb_wwan_outdat_callback(struct urb *urb)
 319 {
 320         struct usb_serial_port *port;
 321         struct usb_wwan_port_private *portdata;
 322         struct usb_wwan_intf_private *intfdata;
 323         int i;
 324
 325         dbg("%s", __func__);
 326
 327         port = urb->context;
 328         intfdata = port->serial->private;
 329
 330         usb_serial_port_softint(port);
 331         usb_autopm_put_interface_async(port->serial->interface);
 332         portdata = usb_get_serial_port_data(port);
 333         spin_lock(&intfdata->susp_lock);
 334         intfdata->in_flight--;
 335         spin_unlock(&intfdata->susp_lock);
 336
 337         for (i = 0; i < N_OUT_URB; ++i) {
 338                 if (portdata->out_urbs[i] == urb) {
 339                         smp_mb__before_clear_bit();
 340                         clear_bit(i, &portdata->out_busy);
 341                         break;
 342                 }
 343         }
 344 }
 345
 346 int usb_wwan_write_room(struct tty_struct *tty)
 347 {
 348         struct usb_serial_port *port = tty->driver_data;
 349         struct usb_wwan_port_private *portdata;
 350         int i;
 351         int data_len = 0;
 352         struct urb *this_urb;
 353
 354         portdata = usb_get_serial_port_data(port);
 355
 356         for (i = 0; i < N_OUT_URB; i++) {
 357                 this_urb = portdata->out_urbs[i];
 358                 if (this_urb && !test_bit(i, &portdata->out_busy))
 359                         data_len += OUT_BUFLEN;
 360         }
 361
 362         dbg("%s: %d", __func__, data_len);
 363         return data_len;
 364 }
 365 EXPORT_SYMBOL(usb_wwan_write_room);
 366
 367 int usb_wwan_chars_in_buffer(struct tty_struct *tty)
 368 {
 369         struct usb_serial_port *port = tty->driver_data;
 370         struct usb_wwan_port_private *portdata;
 371         int i;
 372         int data_len = 0;
 373         struct urb *this_urb;
 374
 375         portdata = usb_get_serial_port_data(port);
 376
 377         for (i = 0; i < N_OUT_URB; i++) {
 378                 this_urb = portdata->out_urbs[i];
 379                 /* FIXME: This locking is insufficient as this_urb may
 380                    go unused during the test */
 381                 if (this_urb && test_bit(i, &portdata->out_busy))
 382                         data_len += this_urb->transfer_buffer_length;
 383         }
 384         dbg("%s: %d", __func__, data_len);
 385         return data_len;
 386 }
 387 EXPORT_SYMBOL(usb_wwan_chars_in_buffer);
 388
 389 int usb_wwan_open(struct tty_struct *tty, struct usb_serial_port *port)
 390 {
 391         struct usb_wwan_port_private *portdata;
 392         struct usb_wwan_intf_private *intfdata;
 393         struct usb_serial *serial = port->serial;
 394         int i, err;
 395         struct urb *urb;
 396
 397         portdata = usb_get_serial_port_data(port);
 398         intfdata = serial->private;
 399
 400         dbg("%s", __func__);
 401
 402         /* Start reading from the IN endpoint */
 403         for (i = 0; i < N_IN_URB; i++) {
 404                 urb = portdata->in_urbs[i];
 405                 if (!urb)
 406                         continue;
 407                 err = usb_submit_urb(urb, GFP_KERNEL);
 408                 if (err) {
 409                         dbg("%s: submit urb %d failed (%d) %d",
 410                             __func__, i, err, urb->transfer_buffer_length);
 411                 }
 412         }
 413
 414         if (intfdata->send_setup)
 415                 intfdata->send_setup(port);
 416
 417         serial->interface->needs_remote_wakeup = 1;
 418         spin_lock_irq(&intfdata->susp_lock);
 419         portdata->opened = 1;
 420         spin_unlock_irq(&intfdata->susp_lock);
 421         usb_autopm_put_interface(serial->interface);
 422
 423         return 0;
 424 }
 425 EXPORT_SYMBOL(usb_wwan_open);
 426
 427 void usb_wwan_close(struct usb_serial_port *port)
 428 {
 429         int i;
 430         struct usb_serial *serial = port->serial;
 431         struct usb_wwan_port_private *portdata;
 432         struct usb_wwan_intf_private *intfdata = port->serial->private;
 433
 434         dbg("%s", __func__);
 435         portdata = usb_get_serial_port_data(port);
 436
 437         if (serial->dev) {
 438                 /* Stop reading/writing urbs */
 439                 spin_lock_irq(&intfdata->susp_lock);
 440                 portdata->opened = 0;
 441                 spin_unlock_irq(&intfdata->susp_lock);
 442
 443                 for (i = 0; i < N_IN_URB; i++)
 444                         usb_kill_urb(portdata->in_urbs[i]);
 445                 for (i = 0; i < N_OUT_URB; i++)
 446                         usb_kill_urb(portdata->out_urbs[i]);
 447                 usb_autopm_get_interface(serial->interface);
 448                 serial->interface->needs_remote_wakeup = 0;
 449         }
 450 }
 451 EXPORT_SYMBOL(usb_wwan_close);
 452
 453 /* Helper functions used by usb_wwan_setup_urbs */
 454 static struct urb *usb_wwan_setup_urb(struct usb_serial *serial, int endpoint,
 455                                       int dir, void *ctx, char *buf, int len,
 456                                       void (*callback) (struct urb *))
 457 {
 458         struct urb *urb;
 459
 460         if (endpoint == -1)
 461                 return NULL;    /* endpoint not needed */
 462
 463         urb = usb_alloc_urb(0, GFP_KERNEL);     /* No ISO */
 464         if (urb == NULL) {
 465                 dbg("%s: alloc for endpoint %d failed.", __func__, endpoint);
 466                 return NULL;
 467         }
 468
 469         /* Fill URB using supplied data. */
 470         usb_fill_bulk_urb(urb, serial->dev,
 471                           usb_sndbulkpipe(serial->dev, endpoint) | dir,
 472                           buf, len, callback, ctx);
 473
 474         return urb;
 475 }
 476
 477 /* Setup urbs */
 478 static void usb_wwan_setup_urbs(struct usb_serial *serial)
 479 {
 480         int i, j;
 481         struct usb_serial_port *port;
 482         struct usb_wwan_port_private *portdata;
 483
 484         dbg("%s", __func__);
 485
 486         for (i = 0; i < serial->num_ports; i++) {
 487                 port = serial->port[i];
 488                 portdata = usb_get_serial_port_data(port);
 489
 490                 /* Do indat endpoints first */
 491                 for (j = 0; j < N_IN_URB; ++j) {
 492                         portdata->in_urbs[j] = usb_wwan_setup_urb(serial,
 493                                                                   port->
 494                                                                   bulk_in_endpointAddress,
 495                                                                   USB_DIR_IN,
 496                                                                   port,
 497                                                                   portdata->
 498                                                                   in_buffer[j],
 499                                                                   IN_BUFLEN,
 500                                                                   usb_wwan_indat_callback);
 501                 }
 502
 503                 /* outdat endpoints */
 504                 for (j = 0; j < N_OUT_URB; ++j) {
 505                         portdata->out_urbs[j] = usb_wwan_setup_urb(serial,
 506                                                                    port->
 507                                                                    bulk_out_endpointAddress,
 508                                                                    USB_DIR_OUT,
 509                                                                    port,
 510                                                                    portdata->
 511                                                                    out_buffer
 512                                                                    [j],
 513                                                                    OUT_BUFLEN,
 514                                                                    usb_wwan_outdat_callback);
 515                 }
 516         }
 517 }
 518
 519 int usb_wwan_startup(struct usb_serial *serial)
 520 {
 521         int i, j, err;
 522         struct usb_serial_port *port;
 523         struct usb_wwan_port_private *portdata;
 524         u8 *buffer;
 525
 526         dbg("%s", __func__);
 527
 528         /* Now setup per port private data */
 529         for (i = 0; i < serial->num_ports; i++) {
 530                 port = serial->port[i];
 531                 portdata = kzalloc(sizeof(*portdata), GFP_KERNEL);
 532                 if (!portdata) {
 533                         dbg("%s: kmalloc for usb_wwan_port_private (%d) failed!.",
 534                             __func__, i);
 535                         return 1;
 536                 }
 537                 init_usb_anchor(&portdata->delayed);
 538
 539                 for (j = 0; j < N_IN_URB; j++) {
 540                         buffer = (u8 *) __get_free_page(GFP_KERNEL);
 541                         if (!buffer)
 542                                 goto bail_out_error;
 543                         portdata->in_buffer[j] = buffer;
 544                 }
 545
 546                 for (j = 0; j < N_OUT_URB; j++) {
 547                         buffer = kmalloc(OUT_BUFLEN, GFP_KERNEL);
 548                         if (!buffer)
 549                                 goto bail_out_error2;
 550                         portdata->out_buffer[j] = buffer;
 551                 }
 552
 553                 usb_set_serial_port_data(port, portdata);
 554
 555                 if (!port->interrupt_in_urb)
 556                         continue;
 557                 err = usb_submit_urb(port->interrupt_in_urb, GFP_KERNEL);
 558                 if (err)
 559                         dbg("%s: submit irq_in urb failed %d", __func__, err);
 560         }
 561         usb_wwan_setup_urbs(serial);
 562         return 0;
 563
 564 bail_out_error2:
 565         for (j = 0; j < N_OUT_URB; j++)
 566                 kfree(portdata->out_buffer[j]);
 567 bail_out_error:
 568         for (j = 0; j < N_IN_URB; j++)
 569                 if (portdata->in_buffer[j])
 570                         free_page((unsigned long)portdata->in_buffer[j]);
 571         kfree(portdata);
 572         return 1;
 573 }
 574 EXPORT_SYMBOL(usb_wwan_startup);
 575
 576 static void stop_read_write_urbs(struct usb_serial *serial)
 577 {
 578         int i, j;
 579         struct usb_serial_port *port;
 580         struct usb_wwan_port_private *portdata;
 581
 582         /* Stop reading/writing urbs */
 583         for (i = 0; i < serial->num_ports; ++i) {
 584                 port = serial->port[i];
 585                 portdata = usb_get_serial_port_data(port);
 586                 for (j = 0; j < N_IN_URB; j++)
 587                         usb_kill_urb(portdata->in_urbs[j]);
 588                 for (j = 0; j < N_OUT_URB; j++)
 589                         usb_kill_urb(portdata->out_urbs[j]);
 590         }
 591 }
 592
 593 void usb_wwan_disconnect(struct usb_serial *serial)
 594 {
 595         dbg("%s", __func__);
 596
 597         stop_read_write_urbs(serial);
 598 }
 599 EXPORT_SYMBOL(usb_wwan_disconnect);
 600
 601 void usb_wwan_release(struct usb_serial *serial)
 602 {
 603         int i, j;
 604         struct usb_serial_port *port;
 605         struct usb_wwan_port_private *portdata;
 606
 607         dbg("%s", __func__);
 608
 609         /* Now free them */
 610         for (i = 0; i < serial->num_ports; ++i) {
 611                 port = serial->port[i];
 612                 portdata = usb_get_serial_port_data(port);
 613
 614                 for (j = 0; j < N_IN_URB; j++) {
 615                         usb_free_urb(portdata->in_urbs[j]);
 616                         free_page((unsigned long)
 617                                   portdata->in_buffer[j]);
 618                         portdata->in_urbs[j] = NULL;
 619                 }
 620                 for (j = 0; j < N_OUT_URB; j++) {
 621                         usb_free_urb(portdata->out_urbs[j]);
 622                         kfree(portdata->out_buffer[j]);
 623                         portdata->out_urbs[j] = NULL;
 624                 }
 625         }
 626
 627         /* Now free per port private data */
 628         for (i = 0; i < serial->num_ports; i++) {
 629                 port = serial->port[i];
 630                 kfree(usb_get_serial_port_data(port));
 631         }
 632 }
 633 EXPORT_SYMBOL(usb_wwan_release);
 634
 635 #ifdef CONFIG_PM
 636 int usb_wwan_suspend(struct usb_serial *serial, pm_message_t message)
 637 {
 638         struct usb_wwan_intf_private *intfdata = serial->private;
 639         int b;
 640
 641         dbg("%s entered", __func__);
 642
 643         if (message.event & PM_EVENT_AUTO) {
 644                 spin_lock_irq(&intfdata->susp_lock);
 645                 b = intfdata->in_flight;
 646                 spin_unlock_irq(&intfdata->susp_lock);
 647
 648                 if (b)
 649                         return -EBUSY;
 650         }
 651
 652         spin_lock_irq(&intfdata->susp_lock);
 653         intfdata->suspended = 1;
 654         spin_unlock_irq(&intfdata->susp_lock);
 655         stop_read_write_urbs(serial);
 656
 657         return 0;
 658 }
 659 EXPORT_SYMBOL(usb_wwan_suspend);
 660
 661 static void play_delayed(struct usb_serial_port *port)
 662 {
 663         struct usb_wwan_intf_private *data;
 664         struct usb_wwan_port_private *portdata;
 665         struct urb *urb;
 666         int err;
 667
 668         portdata = usb_get_serial_port_data(port);
 669         data = port->serial->private;
 670         while ((urb = usb_get_from_anchor(&portdata->delayed))) {
 671                 err = usb_submit_urb(urb, GFP_ATOMIC);
 672                 if (!err)
 673                         data->in_flight++;
 674         }
 675 }
 676
 677 int usb_wwan_resume(struct usb_serial *serial)
 678 {
 679         int i, j;
 680         struct usb_serial_port *port;
 681         struct usb_wwan_intf_private *intfdata = serial->private;
 682         struct usb_wwan_port_private *portdata;
 683         struct urb *urb;
 684         int err = 0;
 685
 686         dbg("%s entered", __func__);
 687         /* get the interrupt URBs resubmitted unconditionally */
 688         for (i = 0; i < serial->num_ports; i++) {
 689                 port = serial->port[i];
 690                 if (!port->interrupt_in_urb) {
 691                         dbg("%s: No interrupt URB for port %d", __func__, i);
 692                         continue;
 693                 }
 694                 err = usb_submit_urb(port->interrupt_in_urb, GFP_NOIO);
 695                 dbg("Submitted interrupt URB for port %d (result %d)", i, err);
 696                 if (err < 0) {
 697                         err("%s: Error %d for interrupt URB of port%d",
 698                             __func__, err, i);
 699                         goto err_out;
 700                 }
 701         }
 702
 703         for (i = 0; i < serial->num_ports; i++) {
 704                 /* walk all ports */
 705                 port = serial->port[i];
 706                 portdata = usb_get_serial_port_data(port);
 707
 708                 /* skip closed ports */
 709                 spin_lock_irq(&intfdata->susp_lock);
 710                 if (!portdata->opened) {
 711                         spin_unlock_irq(&intfdata->susp_lock);
 712                         continue;
 713                 }
 714
 715                 for (j = 0; j < N_IN_URB; j++) {
 716                         urb = portdata->in_urbs[j];
 717                         err = usb_submit_urb(urb, GFP_ATOMIC);
 718                         if (err < 0) {
 719                                 err("%s: Error %d for bulk URB %d",
 720                                     __func__, err, i);
 721                                 spin_unlock_irq(&intfdata->susp_lock);
 722                                 goto err_out;
 723                         }
 724                 }
 725                 play_delayed(port);
 726                 spin_unlock_irq(&intfdata->susp_lock);
 727         }
 728         spin_lock_irq(&intfdata->susp_lock);
 729         intfdata->suspended = 0;
 730         spin_unlock_irq(&intfdata->susp_lock);
 731 err_out:
 732         return err;
 733 }
 734 EXPORT_SYMBOL(usb_wwan_resume);
 735 #endif
 736
 737 MODULE_AUTHOR(DRIVER_AUTHOR);
 738 MODULE_DESCRIPTION(DRIVER_DESC);
 739 MODULE_VERSION(DRIVER_VERSION);
 740 MODULE_LICENSE("GPL");
 741
 742 module_param(debug, bool, S_IRUGO | S_IWUSR);
 743 MODULE_PARM_DESC(debug, "Debug messages");