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) {
 309                                 if (err != -EPERM) {
 310                                         printk(KERN_ERR "%s: resubmit read urb failed. "
 311                                                 "(%d)", __func__, err);
 312                                         /* busy also in error unless we are killed */
 313                                         usb_mark_last_busy(port->serial->dev);
 314                                 }
 315                         } else {
 316                                 usb_mark_last_busy(port->serial->dev);
 317                         }
 318                 }
 319
 320         }
 321 }
 322
 323 static void usb_wwan_outdat_callback(struct urb *urb)
 324 {
 325         struct usb_serial_port *port;
 326         struct usb_wwan_port_private *portdata;
 327         struct usb_wwan_intf_private *intfdata;
 328         int i;
 329
 330         dbg("%s", __func__);
 331
 332         port = urb->context;
 333         intfdata = port->serial->private;
 334
 335         usb_serial_port_softint(port);
 336         usb_autopm_put_interface_async(port->serial->interface);
 337         portdata = usb_get_serial_port_data(port);
 338         spin_lock(&intfdata->susp_lock);
 339         intfdata->in_flight--;
 340         spin_unlock(&intfdata->susp_lock);
 341
 342         for (i = 0; i < N_OUT_URB; ++i) {
 343                 if (portdata->out_urbs[i] == urb) {
 344                         smp_mb__before_clear_bit();
 345                         clear_bit(i, &portdata->out_busy);
 346                         break;
 347                 }
 348         }
 349 }
 350
 351 int usb_wwan_write_room(struct tty_struct *tty)
 352 {
 353         struct usb_serial_port *port = tty->driver_data;
 354         struct usb_wwan_port_private *portdata;
 355         int i;
 356         int data_len = 0;
 357         struct urb *this_urb;
 358
 359         portdata = usb_get_serial_port_data(port);
 360
 361         for (i = 0; i < N_OUT_URB; i++) {
 362                 this_urb = portdata->out_urbs[i];
 363                 if (this_urb && !test_bit(i, &portdata->out_busy))
 364                         data_len += OUT_BUFLEN;
 365         }
 366
 367         dbg("%s: %d", __func__, data_len);
 368         return data_len;
 369 }
 370 EXPORT_SYMBOL(usb_wwan_write_room);
 371
 372 int usb_wwan_chars_in_buffer(struct tty_struct *tty)
 373 {
 374         struct usb_serial_port *port = tty->driver_data;
 375         struct usb_wwan_port_private *portdata;
 376         int i;
 377         int data_len = 0;
 378         struct urb *this_urb;
 379
 380         portdata = usb_get_serial_port_data(port);
 381
 382         for (i = 0; i < N_OUT_URB; i++) {
 383                 this_urb = portdata->out_urbs[i];
 384                 /* FIXME: This locking is insufficient as this_urb may
 385                    go unused during the test */
 386                 if (this_urb && test_bit(i, &portdata->out_busy))
 387                         data_len += this_urb->transfer_buffer_length;
 388         }
 389         dbg("%s: %d", __func__, data_len);
 390         return data_len;
 391 }
 392 EXPORT_SYMBOL(usb_wwan_chars_in_buffer);
 393
 394 int usb_wwan_open(struct tty_struct *tty, struct usb_serial_port *port)
 395 {
 396         struct usb_wwan_port_private *portdata;
 397         struct usb_wwan_intf_private *intfdata;
 398         struct usb_serial *serial = port->serial;
 399         int i, err;
 400         struct urb *urb;
 401
 402         portdata = usb_get_serial_port_data(port);
 403         intfdata = serial->private;
 404
 405         dbg("%s", __func__);
 406
 407         /* Start reading from the IN endpoint */
 408         for (i = 0; i < N_IN_URB; i++) {
 409                 urb = portdata->in_urbs[i];
 410                 if (!urb)
 411                         continue;
 412                 err = usb_submit_urb(urb, GFP_KERNEL);
 413                 if (err) {
 414                         dbg("%s: submit urb %d failed (%d) %d",
 415                             __func__, i, err, urb->transfer_buffer_length);
 416                 }
 417         }
 418
 419         if (intfdata->send_setup)
 420                 intfdata->send_setup(port);
 421
 422         serial->interface->needs_remote_wakeup = 1;
 423         spin_lock_irq(&intfdata->susp_lock);
 424         portdata->opened = 1;
 425         spin_unlock_irq(&intfdata->susp_lock);
 426         usb_autopm_put_interface(serial->interface);
 427
 428         return 0;
 429 }
 430 EXPORT_SYMBOL(usb_wwan_open);
 431
 432 void usb_wwan_close(struct usb_serial_port *port)
 433 {
 434         int i;
 435         struct usb_serial *serial = port->serial;
 436         struct usb_wwan_port_private *portdata;
 437         struct usb_wwan_intf_private *intfdata = port->serial->private;
 438
 439         dbg("%s", __func__);
 440         portdata = usb_get_serial_port_data(port);
 441
 442         if (serial->dev) {
 443                 /* Stop reading/writing urbs */
 444                 spin_lock_irq(&intfdata->susp_lock);
 445                 portdata->opened = 0;
 446                 spin_unlock_irq(&intfdata->susp_lock);
 447
 448                 for (i = 0; i < N_IN_URB; i++)
 449                         usb_kill_urb(portdata->in_urbs[i]);
 450                 for (i = 0; i < N_OUT_URB; i++)
 451                         usb_kill_urb(portdata->out_urbs[i]);
 452                 usb_autopm_get_interface(serial->interface);
 453                 serial->interface->needs_remote_wakeup = 0;
 454         }
 455 }
 456 EXPORT_SYMBOL(usb_wwan_close);
 457
 458 /* Helper functions used by usb_wwan_setup_urbs */
 459 static struct urb *usb_wwan_setup_urb(struct usb_serial *serial, int endpoint,
 460                                       int dir, void *ctx, char *buf, int len,
 461                                       void (*callback) (struct urb *))
 462 {
 463         struct urb *urb;
 464
 465         if (endpoint == -1)
 466                 return NULL;    /* endpoint not needed */
 467
 468         urb = usb_alloc_urb(0, GFP_KERNEL);     /* No ISO */
 469         if (urb == NULL) {
 470                 dbg("%s: alloc for endpoint %d failed.", __func__, endpoint);
 471                 return NULL;
 472         }
 473
 474         /* Fill URB using supplied data. */
 475         usb_fill_bulk_urb(urb, serial->dev,
 476                           usb_sndbulkpipe(serial->dev, endpoint) | dir,
 477                           buf, len, callback, ctx);
 478
 479         return urb;
 480 }
 481
 482 /* Setup urbs */
 483 static void usb_wwan_setup_urbs(struct usb_serial *serial)
 484 {
 485         int i, j;
 486         struct usb_serial_port *port;
 487         struct usb_wwan_port_private *portdata;
 488
 489         dbg("%s", __func__);
 490
 491         for (i = 0; i < serial->num_ports; i++) {
 492                 port = serial->port[i];
 493                 portdata = usb_get_serial_port_data(port);
 494
 495                 /* Do indat endpoints first */
 496                 for (j = 0; j < N_IN_URB; ++j) {
 497                         portdata->in_urbs[j] = usb_wwan_setup_urb(serial,
 498                                                                   port->
 499                                                                   bulk_in_endpointAddress,
 500                                                                   USB_DIR_IN,
 501                                                                   port,
 502                                                                   portdata->
 503                                                                   in_buffer[j],
 504                                                                   IN_BUFLEN,
 505                                                                   usb_wwan_indat_callback);
 506                 }
 507
 508                 /* outdat endpoints */
 509                 for (j = 0; j < N_OUT_URB; ++j) {
 510                         portdata->out_urbs[j] = usb_wwan_setup_urb(serial,
 511                                                                    port->
 512                                                                    bulk_out_endpointAddress,
 513                                                                    USB_DIR_OUT,
 514                                                                    port,
 515                                                                    portdata->
 516                                                                    out_buffer
 517                                                                    [j],
 518                                                                    OUT_BUFLEN,
 519                                                                    usb_wwan_outdat_callback);
 520                 }
 521         }
 522 }
 523
 524 int usb_wwan_startup(struct usb_serial *serial)
 525 {
 526         int i, j, err;
 527         struct usb_serial_port *port;
 528         struct usb_wwan_port_private *portdata;
 529         u8 *buffer;
 530
 531         dbg("%s", __func__);
 532
 533         /* Now setup per port private data */
 534         for (i = 0; i < serial->num_ports; i++) {
 535                 port = serial->port[i];
 536                 portdata = kzalloc(sizeof(*portdata), GFP_KERNEL);
 537                 if (!portdata) {
 538                         dbg("%s: kmalloc for usb_wwan_port_private (%d) failed!.",
 539                             __func__, i);
 540                         return 1;
 541                 }
 542                 init_usb_anchor(&portdata->delayed);
 543
 544                 for (j = 0; j < N_IN_URB; j++) {
 545                         buffer = (u8 *) __get_free_page(GFP_KERNEL);
 546                         if (!buffer)
 547                                 goto bail_out_error;
 548                         portdata->in_buffer[j] = buffer;
 549                 }
 550
 551                 for (j = 0; j < N_OUT_URB; j++) {
 552                         buffer = kmalloc(OUT_BUFLEN, GFP_KERNEL);
 553                         if (!buffer)
 554                                 goto bail_out_error2;
 555                         portdata->out_buffer[j] = buffer;
 556                 }
 557
 558                 usb_set_serial_port_data(port, portdata);
 559
 560                 if (!port->interrupt_in_urb)
 561                         continue;
 562                 err = usb_submit_urb(port->interrupt_in_urb, GFP_KERNEL);
 563                 if (err)
 564                         dbg("%s: submit irq_in urb failed %d", __func__, err);
 565         }
 566         usb_wwan_setup_urbs(serial);
 567         return 0;
 568
 569 bail_out_error2:
 570         for (j = 0; j < N_OUT_URB; j++)
 571                 kfree(portdata->out_buffer[j]);
 572 bail_out_error:
 573         for (j = 0; j < N_IN_URB; j++)
 574                 if (portdata->in_buffer[j])
 575                         free_page((unsigned long)portdata->in_buffer[j]);
 576         kfree(portdata);
 577         return 1;
 578 }
 579 EXPORT_SYMBOL(usb_wwan_startup);
 580
 581 static void stop_read_write_urbs(struct usb_serial *serial)
 582 {
 583         int i, j;
 584         struct usb_serial_port *port;
 585         struct usb_wwan_port_private *portdata;
 586
 587         /* Stop reading/writing urbs */
 588         for (i = 0; i < serial->num_ports; ++i) {
 589                 port = serial->port[i];
 590                 portdata = usb_get_serial_port_data(port);
 591                 for (j = 0; j < N_IN_URB; j++)
 592                         usb_kill_urb(portdata->in_urbs[j]);
 593                 for (j = 0; j < N_OUT_URB; j++)
 594                         usb_kill_urb(portdata->out_urbs[j]);
 595         }
 596 }
 597
 598 void usb_wwan_disconnect(struct usb_serial *serial)
 599 {
 600         dbg("%s", __func__);
 601
 602         stop_read_write_urbs(serial);
 603 }
 604 EXPORT_SYMBOL(usb_wwan_disconnect);
 605
 606 void usb_wwan_release(struct usb_serial *serial)
 607 {
 608         int i, j;
 609         struct usb_serial_port *port;
 610         struct usb_wwan_port_private *portdata;
 611
 612         dbg("%s", __func__);
 613
 614         /* Now free them */
 615         for (i = 0; i < serial->num_ports; ++i) {
 616                 port = serial->port[i];
 617                 portdata = usb_get_serial_port_data(port);
 618
 619                 for (j = 0; j < N_IN_URB; j++) {
 620                         usb_free_urb(portdata->in_urbs[j]);
 621                         free_page((unsigned long)
 622                                   portdata->in_buffer[j]);
 623                         portdata->in_urbs[j] = NULL;
 624                 }
 625                 for (j = 0; j < N_OUT_URB; j++) {
 626                         usb_free_urb(portdata->out_urbs[j]);
 627                         kfree(portdata->out_buffer[j]);
 628                         portdata->out_urbs[j] = NULL;
 629                 }
 630         }
 631
 632         /* Now free per port private data */
 633         for (i = 0; i < serial->num_ports; i++) {
 634                 port = serial->port[i];
 635                 kfree(usb_get_serial_port_data(port));
 636         }
 637 }
 638 EXPORT_SYMBOL(usb_wwan_release);
 639
 640 #ifdef CONFIG_PM
 641 int usb_wwan_suspend(struct usb_serial *serial, pm_message_t message)
 642 {
 643         struct usb_wwan_intf_private *intfdata = serial->private;
 644         int b;
 645
 646         dbg("%s entered", __func__);
 647
 648         if (message.event & PM_EVENT_AUTO) {
 649                 spin_lock_irq(&intfdata->susp_lock);
 650                 b = intfdata->in_flight;
 651                 spin_unlock_irq(&intfdata->susp_lock);
 652
 653                 if (b)
 654                         return -EBUSY;
 655         }
 656
 657         spin_lock_irq(&intfdata->susp_lock);
 658         intfdata->suspended = 1;
 659         spin_unlock_irq(&intfdata->susp_lock);
 660         stop_read_write_urbs(serial);
 661
 662         return 0;
 663 }
 664 EXPORT_SYMBOL(usb_wwan_suspend);
 665
 666 static void play_delayed(struct usb_serial_port *port)
 667 {
 668         struct usb_wwan_intf_private *data;
 669         struct usb_wwan_port_private *portdata;
 670         struct urb *urb;
 671         int err;
 672
 673         portdata = usb_get_serial_port_data(port);
 674         data = port->serial->private;
 675         while ((urb = usb_get_from_anchor(&portdata->delayed))) {
 676                 err = usb_submit_urb(urb, GFP_ATOMIC);
 677                 if (!err)
 678                         data->in_flight++;
 679         }
 680 }
 681
 682 int usb_wwan_resume(struct usb_serial *serial)
 683 {
 684         int i, j;
 685         struct usb_serial_port *port;
 686         struct usb_wwan_intf_private *intfdata = serial->private;
 687         struct usb_wwan_port_private *portdata;
 688         struct urb *urb;
 689         int err = 0;
 690
 691         dbg("%s entered", __func__);
 692         /* get the interrupt URBs resubmitted unconditionally */
 693         for (i = 0; i < serial->num_ports; i++) {
 694                 port = serial->port[i];
 695                 if (!port->interrupt_in_urb) {
 696                         dbg("%s: No interrupt URB for port %d", __func__, i);
 697                         continue;
 698                 }
 699                 err = usb_submit_urb(port->interrupt_in_urb, GFP_NOIO);
 700                 dbg("Submitted interrupt URB for port %d (result %d)", i, err);
 701                 if (err < 0) {
 702                         err("%s: Error %d for interrupt URB of port%d",
 703                             __func__, err, i);
 704                         goto err_out;
 705                 }
 706         }
 707
 708         for (i = 0; i < serial->num_ports; i++) {
 709                 /* walk all ports */
 710                 port = serial->port[i];
 711                 portdata = usb_get_serial_port_data(port);
 712
 713                 /* skip closed ports */
 714                 spin_lock_irq(&intfdata->susp_lock);
 715                 if (!portdata->opened) {
 716                         spin_unlock_irq(&intfdata->susp_lock);
 717                         continue;
 718                 }
 719
 720                 for (j = 0; j < N_IN_URB; j++) {
 721                         urb = portdata->in_urbs[j];
 722                         err = usb_submit_urb(urb, GFP_ATOMIC);
 723                         if (err < 0) {
 724                                 err("%s: Error %d for bulk URB %d",
 725                                     __func__, err, i);
 726                                 spin_unlock_irq(&intfdata->susp_lock);
 727                                 goto err_out;
 728                         }
 729                 }
 730                 play_delayed(port);
 731                 spin_unlock_irq(&intfdata->susp_lock);
 732         }
 733         spin_lock_irq(&intfdata->susp_lock);
 734         intfdata->suspended = 0;
 735         spin_unlock_irq(&intfdata->susp_lock);
 736 err_out:
 737         return err;
 738 }
 739 EXPORT_SYMBOL(usb_wwan_resume);
 740 #endif
 741
 742 MODULE_AUTHOR(DRIVER_AUTHOR);
 743 MODULE_DESCRIPTION(DRIVER_DESC);
 744 MODULE_VERSION(DRIVER_VERSION);
 745 MODULE_LICENSE("GPL");
 746
 747 module_param(debug, bool, S_IRUGO | S_IWUSR);
 748 MODULE_PARM_DESC(debug, "Debug messages");