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_wwan_port_private *portdata;
  45
  46         struct usb_wwan_intf_private *intfdata;
  47
  48         dbg("%s", __func__);
  49
  50         intfdata = port->serial->private;
  51
  52         if (!intfdata->send_setup)
  53                 return;
  54
  55         portdata = usb_get_serial_port_data(port);
  56         /* FIXME: locking */
  57         portdata->rts_state = on;
  58         portdata->dtr_state = on;
  59
  60         intfdata->send_setup(port);
  61 }
  62 EXPORT_SYMBOL(usb_wwan_dtr_rts);
  63
  64 void usb_wwan_set_termios(struct tty_struct *tty,
  65                           struct usb_serial_port *port,
  66                           struct ktermios *old_termios)
  67 {
  68         struct usb_wwan_intf_private *intfdata = port->serial->private;
  69
  70         dbg("%s", __func__);
  71
  72         /* Doesn't support option setting */
  73         tty_termios_copy_hw(tty->termios, old_termios);
  74
  75         if (intfdata->send_setup)
  76                 intfdata->send_setup(port);
  77 }
  78 EXPORT_SYMBOL(usb_wwan_set_termios);
  79
  80 int usb_wwan_tiocmget(struct tty_struct *tty)
  81 {
  82         struct usb_serial_port *port = tty->driver_data;
  83         unsigned int value;
  84         struct usb_wwan_port_private *portdata;
  85
  86         portdata = usb_get_serial_port_data(port);
  87
  88         value = ((portdata->rts_state) ? TIOCM_RTS : 0) |
  89             ((portdata->dtr_state) ? TIOCM_DTR : 0) |
  90             ((portdata->cts_state) ? TIOCM_CTS : 0) |
  91             ((portdata->dsr_state) ? TIOCM_DSR : 0) |
  92             ((portdata->dcd_state) ? TIOCM_CAR : 0) |
  93             ((portdata->ri_state) ? TIOCM_RNG : 0);
  94
  95         return value;
  96 }
  97 EXPORT_SYMBOL(usb_wwan_tiocmget);
  98
  99 int usb_wwan_tiocmset(struct tty_struct *tty,
 100                       unsigned int set, unsigned int clear)
 101 {
 102         struct usb_serial_port *port = tty->driver_data;
 103         struct usb_wwan_port_private *portdata;
 104         struct usb_wwan_intf_private *intfdata;
 105
 106         portdata = usb_get_serial_port_data(port);
 107         intfdata = port->serial->private;
 108
 109         if (!intfdata->send_setup)
 110                 return -EINVAL;
 111
 112         /* FIXME: what locks portdata fields ? */
 113         if (set & TIOCM_RTS)
 114                 portdata->rts_state = 1;
 115         if (set & TIOCM_DTR)
 116                 portdata->dtr_state = 1;
 117
 118         if (clear & TIOCM_RTS)
 119                 portdata->rts_state = 0;
 120         if (clear & TIOCM_DTR)
 121                 portdata->dtr_state = 0;
 122         return intfdata->send_setup(port);
 123 }
 124 EXPORT_SYMBOL(usb_wwan_tiocmset);
 125
 126 static int get_serial_info(struct usb_serial_port *port,
 127                            struct serial_struct __user *retinfo)
 128 {
 129         struct serial_struct tmp;
 130
 131         if (!retinfo)
 132                 return -EFAULT;
 133
 134         memset(&tmp, 0, sizeof(tmp));
 135         tmp.line            = port->serial->minor;
 136         tmp.port            = port->number;
 137         tmp.baud_base       = tty_get_baud_rate(port->port.tty);
 138         tmp.close_delay     = port->port.close_delay / 10;
 139         tmp.closing_wait    = port->port.closing_wait == ASYNC_CLOSING_WAIT_NONE ?
 140                                  ASYNC_CLOSING_WAIT_NONE :
 141                                  port->port.closing_wait / 10;
 142
 143         if (copy_to_user(retinfo, &tmp, sizeof(*retinfo)))
 144                 return -EFAULT;
 145         return 0;
 146 }
 147
 148 static int set_serial_info(struct usb_serial_port *port,
 149                            struct serial_struct __user *newinfo)
 150 {
 151         struct serial_struct new_serial;
 152         unsigned int closing_wait, close_delay;
 153         int retval = 0;
 154
 155         if (copy_from_user(&new_serial, newinfo, sizeof(new_serial)))
 156                 return -EFAULT;
 157
 158         close_delay = new_serial.close_delay * 10;
 159         closing_wait = new_serial.closing_wait == ASYNC_CLOSING_WAIT_NONE ?
 160                         ASYNC_CLOSING_WAIT_NONE : new_serial.closing_wait * 10;
 161
 162         mutex_lock(&port->port.mutex);
 163
 164         if (!capable(CAP_SYS_ADMIN)) {
 165                 if ((close_delay != port->port.close_delay) ||
 166                     (closing_wait != port->port.closing_wait))
 167                         retval = -EPERM;
 168                 else
 169                         retval = -EOPNOTSUPP;
 170         } else {
 171                 port->port.close_delay  = close_delay;
 172                 port->port.closing_wait = closing_wait;
 173         }
 174
 175         mutex_unlock(&port->port.mutex);
 176         return retval;
 177 }
 178
 179 int usb_wwan_ioctl(struct tty_struct *tty,
 180                    unsigned int cmd, unsigned long arg)
 181 {
 182         struct usb_serial_port *port = tty->driver_data;
 183
 184         dbg("%s cmd 0x%04x", __func__, cmd);
 185
 186         switch (cmd) {
 187         case TIOCGSERIAL:
 188                 return get_serial_info(port,
 189                                        (struct serial_struct __user *) arg);
 190         case TIOCSSERIAL:
 191                 return set_serial_info(port,
 192                                        (struct serial_struct __user *) arg);
 193         default:
 194                 break;
 195         }
 196
 197         dbg("%s arg not supported", __func__);
 198
 199         return -ENOIOCTLCMD;
 200 }
 201 EXPORT_SYMBOL(usb_wwan_ioctl);
 202
 203 /* Write */
 204 int usb_wwan_write(struct tty_struct *tty, struct usb_serial_port *port,
 205                    const unsigned char *buf, int count)
 206 {
 207         struct usb_wwan_port_private *portdata;
 208         struct usb_wwan_intf_private *intfdata;
 209         int i;
 210         int left, todo;
 211         struct urb *this_urb = NULL;    /* spurious */
 212         int err;
 213         unsigned long flags;
 214
 215         portdata = usb_get_serial_port_data(port);
 216         intfdata = port->serial->private;
 217
 218         dbg("%s: write (%d chars)", __func__, count);
 219
 220         i = 0;
 221         left = count;
 222         for (i = 0; left > 0 && i < N_OUT_URB; i++) {
 223                 todo = left;
 224                 if (todo > OUT_BUFLEN)
 225                         todo = OUT_BUFLEN;
 226
 227                 this_urb = portdata->out_urbs[i];
 228                 if (test_and_set_bit(i, &portdata->out_busy)) {
 229                         if (time_before(jiffies,
 230                                         portdata->tx_start_time[i] + 10 * HZ))
 231                                 continue;
 232                         usb_unlink_urb(this_urb);
 233                         continue;
 234                 }
 235                 dbg("%s: endpoint %d buf %d", __func__,
 236                     usb_pipeendpoint(this_urb->pipe), i);
 237
 238                 err = usb_autopm_get_interface_async(port->serial->interface);
 239                 if (err < 0)
 240                         break;
 241
 242                 /* send the data */
 243                 memcpy(this_urb->transfer_buffer, buf, todo);
 244                 this_urb->transfer_buffer_length = todo;
 245
 246                 spin_lock_irqsave(&intfdata->susp_lock, flags);
 247                 if (intfdata->suspended) {
 248                         usb_anchor_urb(this_urb, &portdata->delayed);
 249                         spin_unlock_irqrestore(&intfdata->susp_lock, flags);
 250                 } else {
 251                         intfdata->in_flight++;
 252                         spin_unlock_irqrestore(&intfdata->susp_lock, flags);
 253                         err = usb_submit_urb(this_urb, GFP_ATOMIC);
 254                         if (err) {
 255                                 dbg("usb_submit_urb %p (write bulk) failed "
 256                                     "(%d)", this_urb, err);
 257                                 clear_bit(i, &portdata->out_busy);
 258                                 spin_lock_irqsave(&intfdata->susp_lock, flags);
 259                                 intfdata->in_flight--;
 260                                 spin_unlock_irqrestore(&intfdata->susp_lock,
 261                                                        flags);
 262                                 usb_autopm_put_interface_async(port->serial->interface);
 263                                 break;
 264                         }
 265                 }
 266
 267                 portdata->tx_start_time[i] = jiffies;
 268                 buf += todo;
 269                 left -= todo;
 270         }
 271
 272         count -= left;
 273         dbg("%s: wrote (did %d)", __func__, count);
 274         return count;
 275 }
 276 EXPORT_SYMBOL(usb_wwan_write);
 277
 278 static void usb_wwan_indat_callback(struct urb *urb)
 279 {
 280         int err;
 281         int endpoint;
 282         struct usb_serial_port *port;
 283         struct tty_struct *tty;
 284         unsigned char *data = urb->transfer_buffer;
 285         int status = urb->status;
 286
 287         dbg("%s: %p", __func__, urb);
 288
 289         endpoint = usb_pipeendpoint(urb->pipe);
 290         port = urb->context;
 291
 292         if (status) {
 293                 dbg("%s: nonzero status: %d on endpoint %02x.",
 294                     __func__, status, endpoint);
 295         } else {
 296                 tty = tty_port_tty_get(&port->port);
 297                 if (tty) {
 298                         if (urb->actual_length) {
 299                                 tty_insert_flip_string(tty, data,
 300                                                 urb->actual_length);
 301                                 tty_flip_buffer_push(tty);
 302                         } else
 303                                 dbg("%s: empty read urb received", __func__);
 304                         tty_kref_put(tty);
 305                 }
 306
 307                 /* Resubmit urb so we continue receiving */
 308                 if (status != -ESHUTDOWN) {
 309                         err = usb_submit_urb(urb, GFP_ATOMIC);
 310                         if (err) {
 311                                 if (err != -EPERM) {
 312                                         printk(KERN_ERR "%s: resubmit read urb failed. "
 313                                                 "(%d)", __func__, err);
 314                                         /* busy also in error unless we are killed */
 315                                         usb_mark_last_busy(port->serial->dev);
 316                                 }
 317                         } else {
 318                                 usb_mark_last_busy(port->serial->dev);
 319                         }
 320                 }
 321
 322         }
 323 }
 324
 325 static void usb_wwan_outdat_callback(struct urb *urb)
 326 {
 327         struct usb_serial_port *port;
 328         struct usb_wwan_port_private *portdata;
 329         struct usb_wwan_intf_private *intfdata;
 330         int i;
 331
 332         dbg("%s", __func__);
 333
 334         port = urb->context;
 335         intfdata = port->serial->private;
 336
 337         usb_serial_port_softint(port);
 338         usb_autopm_put_interface_async(port->serial->interface);
 339         portdata = usb_get_serial_port_data(port);
 340         spin_lock(&intfdata->susp_lock);
 341         intfdata->in_flight--;
 342         spin_unlock(&intfdata->susp_lock);
 343
 344         for (i = 0; i < N_OUT_URB; ++i) {
 345                 if (portdata->out_urbs[i] == urb) {
 346                         smp_mb__before_clear_bit();
 347                         clear_bit(i, &portdata->out_busy);
 348                         break;
 349                 }
 350         }
 351 }
 352
 353 int usb_wwan_write_room(struct tty_struct *tty)
 354 {
 355         struct usb_serial_port *port = tty->driver_data;
 356         struct usb_wwan_port_private *portdata;
 357         int i;
 358         int data_len = 0;
 359         struct urb *this_urb;
 360
 361         portdata = usb_get_serial_port_data(port);
 362
 363         for (i = 0; i < N_OUT_URB; i++) {
 364                 this_urb = portdata->out_urbs[i];
 365                 if (this_urb && !test_bit(i, &portdata->out_busy))
 366                         data_len += OUT_BUFLEN;
 367         }
 368
 369         dbg("%s: %d", __func__, data_len);
 370         return data_len;
 371 }
 372 EXPORT_SYMBOL(usb_wwan_write_room);
 373
 374 int usb_wwan_chars_in_buffer(struct tty_struct *tty)
 375 {
 376         struct usb_serial_port *port = tty->driver_data;
 377         struct usb_wwan_port_private *portdata;
 378         int i;
 379         int data_len = 0;
 380         struct urb *this_urb;
 381
 382         portdata = usb_get_serial_port_data(port);
 383
 384         for (i = 0; i < N_OUT_URB; i++) {
 385                 this_urb = portdata->out_urbs[i];
 386                 /* FIXME: This locking is insufficient as this_urb may
 387                    go unused during the test */
 388                 if (this_urb && test_bit(i, &portdata->out_busy))
 389                         data_len += this_urb->transfer_buffer_length;
 390         }
 391         dbg("%s: %d", __func__, data_len);
 392         return data_len;
 393 }
 394 EXPORT_SYMBOL(usb_wwan_chars_in_buffer);
 395
 396 int usb_wwan_open(struct tty_struct *tty, struct usb_serial_port *port)
 397 {
 398         struct usb_wwan_port_private *portdata;
 399         struct usb_wwan_intf_private *intfdata;
 400         struct usb_serial *serial = port->serial;
 401         int i, err;
 402         struct urb *urb;
 403
 404         portdata = usb_get_serial_port_data(port);
 405         intfdata = serial->private;
 406
 407         dbg("%s", __func__);
 408
 409         /* Start reading from the IN endpoint */
 410         for (i = 0; i < N_IN_URB; i++) {
 411                 urb = portdata->in_urbs[i];
 412                 if (!urb)
 413                         continue;
 414                 err = usb_submit_urb(urb, GFP_KERNEL);
 415                 if (err) {
 416                         dbg("%s: submit urb %d failed (%d) %d",
 417                             __func__, i, err, urb->transfer_buffer_length);
 418                 }
 419         }
 420
 421         if (intfdata->send_setup)
 422                 intfdata->send_setup(port);
 423
 424         serial->interface->needs_remote_wakeup = 1;
 425         spin_lock_irq(&intfdata->susp_lock);
 426         portdata->opened = 1;
 427         spin_unlock_irq(&intfdata->susp_lock);
 428         /* this balances a get in the generic USB serial code */
 429         usb_autopm_put_interface(serial->interface);
 430
 431         return 0;
 432 }
 433 EXPORT_SYMBOL(usb_wwan_open);
 434
 435 void usb_wwan_close(struct usb_serial_port *port)
 436 {
 437         int i;
 438         struct usb_serial *serial = port->serial;
 439         struct usb_wwan_port_private *portdata;
 440         struct usb_wwan_intf_private *intfdata = port->serial->private;
 441
 442         dbg("%s", __func__);
 443         portdata = usb_get_serial_port_data(port);
 444
 445         if (serial->dev) {
 446                 /* Stop reading/writing urbs */
 447                 spin_lock_irq(&intfdata->susp_lock);
 448                 portdata->opened = 0;
 449                 spin_unlock_irq(&intfdata->susp_lock);
 450
 451                 for (i = 0; i < N_IN_URB; i++)
 452                         usb_kill_urb(portdata->in_urbs[i]);
 453                 for (i = 0; i < N_OUT_URB; i++)
 454                         usb_kill_urb(portdata->out_urbs[i]);
 455                 /* balancing - important as an error cannot be handled*/
 456                 usb_autopm_get_interface_no_resume(serial->interface);
 457                 serial->interface->needs_remote_wakeup = 0;
 458         }
 459 }
 460 EXPORT_SYMBOL(usb_wwan_close);
 461
 462 /* Helper functions used by usb_wwan_setup_urbs */
 463 static struct urb *usb_wwan_setup_urb(struct usb_serial *serial, int endpoint,
 464                                       int dir, void *ctx, char *buf, int len,
 465                                       void (*callback) (struct urb *))
 466 {
 467         struct urb *urb;
 468
 469         if (endpoint == -1)
 470                 return NULL;    /* endpoint not needed */
 471
 472         urb = usb_alloc_urb(0, GFP_KERNEL);     /* No ISO */
 473         if (urb == NULL) {
 474                 dbg("%s: alloc for endpoint %d failed.", __func__, endpoint);
 475                 return NULL;
 476         }
 477
 478         /* Fill URB using supplied data. */
 479         usb_fill_bulk_urb(urb, serial->dev,
 480                           usb_sndbulkpipe(serial->dev, endpoint) | dir,
 481                           buf, len, callback, ctx);
 482
 483         return urb;
 484 }
 485
 486 /* Setup urbs */
 487 static void usb_wwan_setup_urbs(struct usb_serial *serial)
 488 {
 489         int i, j;
 490         struct usb_serial_port *port;
 491         struct usb_wwan_port_private *portdata;
 492
 493         dbg("%s", __func__);
 494
 495         for (i = 0; i < serial->num_ports; i++) {
 496                 port = serial->port[i];
 497                 portdata = usb_get_serial_port_data(port);
 498
 499                 /* Do indat endpoints first */
 500                 for (j = 0; j < N_IN_URB; ++j) {
 501                         portdata->in_urbs[j] = usb_wwan_setup_urb(serial,
 502                                                                   port->
 503                                                                   bulk_in_endpointAddress,
 504                                                                   USB_DIR_IN,
 505                                                                   port,
 506                                                                   portdata->
 507                                                                   in_buffer[j],
 508                                                                   IN_BUFLEN,
 509                                                                   usb_wwan_indat_callback);
 510                 }
 511
 512                 /* outdat endpoints */
 513                 for (j = 0; j < N_OUT_URB; ++j) {
 514                         portdata->out_urbs[j] = usb_wwan_setup_urb(serial,
 515                                                                    port->
 516                                                                    bulk_out_endpointAddress,
 517                                                                    USB_DIR_OUT,
 518                                                                    port,
 519                                                                    portdata->
 520                                                                    out_buffer
 521                                                                    [j],
 522                                                                    OUT_BUFLEN,
 523                                                                    usb_wwan_outdat_callback);
 524                 }
 525         }
 526 }
 527
 528 int usb_wwan_startup(struct usb_serial *serial)
 529 {
 530         int i, j, err;
 531         struct usb_serial_port *port;
 532         struct usb_wwan_port_private *portdata;
 533         u8 *buffer;
 534
 535         dbg("%s", __func__);
 536
 537         /* Now setup per port private data */
 538         for (i = 0; i < serial->num_ports; i++) {
 539                 port = serial->port[i];
 540                 portdata = kzalloc(sizeof(*portdata), GFP_KERNEL);
 541                 if (!portdata) {
 542                         dbg("%s: kmalloc for usb_wwan_port_private (%d) failed!.",
 543                             __func__, i);
 544                         return 1;
 545                 }
 546                 init_usb_anchor(&portdata->delayed);
 547
 548                 for (j = 0; j < N_IN_URB; j++) {
 549                         buffer = (u8 *) __get_free_page(GFP_KERNEL);
 550                         if (!buffer)
 551                                 goto bail_out_error;
 552                         portdata->in_buffer[j] = buffer;
 553                 }
 554
 555                 for (j = 0; j < N_OUT_URB; j++) {
 556                         buffer = kmalloc(OUT_BUFLEN, GFP_KERNEL);
 557                         if (!buffer)
 558                                 goto bail_out_error2;
 559                         portdata->out_buffer[j] = buffer;
 560                 }
 561
 562                 usb_set_serial_port_data(port, portdata);
 563
 564                 if (!port->interrupt_in_urb)
 565                         continue;
 566                 err = usb_submit_urb(port->interrupt_in_urb, GFP_KERNEL);
 567                 if (err)
 568                         dbg("%s: submit irq_in urb failed %d", __func__, err);
 569         }
 570         usb_wwan_setup_urbs(serial);
 571         return 0;
 572
 573 bail_out_error2:
 574         for (j = 0; j < N_OUT_URB; j++)
 575                 kfree(portdata->out_buffer[j]);
 576 bail_out_error:
 577         for (j = 0; j < N_IN_URB; j++)
 578                 if (portdata->in_buffer[j])
 579                         free_page((unsigned long)portdata->in_buffer[j]);
 580         kfree(portdata);
 581         return 1;
 582 }
 583 EXPORT_SYMBOL(usb_wwan_startup);
 584
 585 static void stop_read_write_urbs(struct usb_serial *serial)
 586 {
 587         int i, j;
 588         struct usb_serial_port *port;
 589         struct usb_wwan_port_private *portdata;
 590
 591         /* Stop reading/writing urbs */
 592         for (i = 0; i < serial->num_ports; ++i) {
 593                 port = serial->port[i];
 594                 portdata = usb_get_serial_port_data(port);
 595                 for (j = 0; j < N_IN_URB; j++)
 596                         usb_kill_urb(portdata->in_urbs[j]);
 597                 for (j = 0; j < N_OUT_URB; j++)
 598                         usb_kill_urb(portdata->out_urbs[j]);
 599         }
 600 }
 601
 602 void usb_wwan_disconnect(struct usb_serial *serial)
 603 {
 604         dbg("%s", __func__);
 605
 606         stop_read_write_urbs(serial);
 607 }
 608 EXPORT_SYMBOL(usb_wwan_disconnect);
 609
 610 void usb_wwan_release(struct usb_serial *serial)
 611 {
 612         int i, j;
 613         struct usb_serial_port *port;
 614         struct usb_wwan_port_private *portdata;
 615
 616         dbg("%s", __func__);
 617
 618         /* Now free them */
 619         for (i = 0; i < serial->num_ports; ++i) {
 620                 port = serial->port[i];
 621                 portdata = usb_get_serial_port_data(port);
 622
 623                 for (j = 0; j < N_IN_URB; j++) {
 624                         usb_free_urb(portdata->in_urbs[j]);
 625                         free_page((unsigned long)
 626                                   portdata->in_buffer[j]);
 627                         portdata->in_urbs[j] = NULL;
 628                 }
 629                 for (j = 0; j < N_OUT_URB; j++) {
 630                         usb_free_urb(portdata->out_urbs[j]);
 631                         kfree(portdata->out_buffer[j]);
 632                         portdata->out_urbs[j] = NULL;
 633                 }
 634         }
 635
 636         /* Now free per port private data */
 637         for (i = 0; i < serial->num_ports; i++) {
 638                 port = serial->port[i];
 639                 kfree(usb_get_serial_port_data(port));
 640         }
 641 }
 642 EXPORT_SYMBOL(usb_wwan_release);
 643
 644 #ifdef CONFIG_PM
 645 int usb_wwan_suspend(struct usb_serial *serial, pm_message_t message)
 646 {
 647         struct usb_wwan_intf_private *intfdata = serial->private;
 648         int b;
 649
 650         dbg("%s entered", __func__);
 651
 652         if (PMSG_IS_AUTO(message)) {
 653                 spin_lock_irq(&intfdata->susp_lock);
 654                 b = intfdata->in_flight;
 655                 spin_unlock_irq(&intfdata->susp_lock);
 656
 657                 if (b)
 658                         return -EBUSY;
 659         }
 660
 661         spin_lock_irq(&intfdata->susp_lock);
 662         intfdata->suspended = 1;
 663         spin_unlock_irq(&intfdata->susp_lock);
 664         stop_read_write_urbs(serial);
 665
 666         return 0;
 667 }
 668 EXPORT_SYMBOL(usb_wwan_suspend);
 669
 670 static void unbusy_queued_urb(struct urb *urb, struct usb_wwan_port_private *portdata)
 671 {
 672         int i;
 673
 674         for (i = 0; i < N_OUT_URB; i++) {
 675                 if (urb == portdata->out_urbs[i]) {
 676                         clear_bit(i, &portdata->out_busy);
 677                         break;
 678                 }
 679         }
 680 }
 681
 682 static void play_delayed(struct usb_serial_port *port)
 683 {
 684         struct usb_wwan_intf_private *data;
 685         struct usb_wwan_port_private *portdata;
 686         struct urb *urb;
 687         int err;
 688
 689         portdata = usb_get_serial_port_data(port);
 690         data = port->serial->private;
 691         while ((urb = usb_get_from_anchor(&portdata->delayed))) {
 692                 err = usb_submit_urb(urb, GFP_ATOMIC);
 693                 if (!err) {
 694                         data->in_flight++;
 695                 } else {
 696                         /* we have to throw away the rest */
 697                         do {
 698                                 unbusy_queued_urb(urb, portdata);
 699                                 usb_autopm_put_interface_no_suspend(port->serial->interface);
 700                         } while ((urb = usb_get_from_anchor(&portdata->delayed)));
 701                         break;
 702                 }
 703         }
 704 }
 705
 706 int usb_wwan_resume(struct usb_serial *serial)
 707 {
 708         int i, j;
 709         struct usb_serial_port *port;
 710         struct usb_wwan_intf_private *intfdata = serial->private;
 711         struct usb_wwan_port_private *portdata;
 712         struct urb *urb;
 713         int err = 0;
 714
 715         dbg("%s entered", __func__);
 716         /* get the interrupt URBs resubmitted unconditionally */
 717         for (i = 0; i < serial->num_ports; i++) {
 718                 port = serial->port[i];
 719                 if (!port->interrupt_in_urb) {
 720                         dbg("%s: No interrupt URB for port %d", __func__, i);
 721                         continue;
 722                 }
 723                 err = usb_submit_urb(port->interrupt_in_urb, GFP_NOIO);
 724                 dbg("Submitted interrupt URB for port %d (result %d)", i, err);
 725                 if (err < 0) {
 726                         err("%s: Error %d for interrupt URB of port%d",
 727                             __func__, err, i);
 728                         goto err_out;
 729                 }
 730         }
 731
 732         for (i = 0; i < serial->num_ports; i++) {
 733                 /* walk all ports */
 734                 port = serial->port[i];
 735                 portdata = usb_get_serial_port_data(port);
 736
 737                 /* skip closed ports */
 738                 spin_lock_irq(&intfdata->susp_lock);
 739                 if (!portdata->opened) {
 740                         spin_unlock_irq(&intfdata->susp_lock);
 741                         continue;
 742                 }
 743
 744                 for (j = 0; j < N_IN_URB; j++) {
 745                         urb = portdata->in_urbs[j];
 746                         err = usb_submit_urb(urb, GFP_ATOMIC);
 747                         if (err < 0) {
 748                                 err("%s: Error %d for bulk URB %d",
 749                                     __func__, err, i);
 750                                 spin_unlock_irq(&intfdata->susp_lock);
 751                                 goto err_out;
 752                         }
 753                 }
 754                 play_delayed(port);
 755                 spin_unlock_irq(&intfdata->susp_lock);
 756         }
 757         spin_lock_irq(&intfdata->susp_lock);
 758         intfdata->suspended = 0;
 759         spin_unlock_irq(&intfdata->susp_lock);
 760 err_out:
 761         return err;
 762 }
 763 EXPORT_SYMBOL(usb_wwan_resume);
 764 #endif
 765
 766 MODULE_AUTHOR(DRIVER_AUTHOR);
 767 MODULE_DESCRIPTION(DRIVER_DESC);
 768 MODULE_VERSION(DRIVER_VERSION);
 769 MODULE_LICENSE("GPL");
 770
 771 module_param(debug, bool, S_IRUGO | S_IWUSR);
 772 MODULE_PARM_DESC(debug, "Debug messages");