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 void usb_wwan_dtr_rts(struct usb_serial_port *port, int on)
  41 {
  42         struct usb_serial *serial = port->serial;
  43         struct usb_wwan_port_private *portdata;
  44         struct usb_wwan_intf_private *intfdata;
  45
  46         intfdata = port->serial->private;
  47
  48         if (!intfdata->send_setup)
  49                 return;
  50
  51         portdata = usb_get_serial_port_data(port);
  52         mutex_lock(&serial->disc_mutex);
  53         portdata->rts_state = on;
  54         portdata->dtr_state = on;
  55         if (serial->dev)
  56                 intfdata->send_setup(port);
  57         mutex_unlock(&serial->disc_mutex);
  58 }
  59 EXPORT_SYMBOL(usb_wwan_dtr_rts);
  60
  61 void usb_wwan_set_termios(struct tty_struct *tty,
  62                           struct usb_serial_port *port,
  63                           struct ktermios *old_termios)
  64 {
  65         struct usb_wwan_intf_private *intfdata = port->serial->private;
  66
  67         /* Doesn't support option setting */
  68         tty_termios_copy_hw(&tty->termios, old_termios);
  69
  70         if (intfdata->send_setup)
  71                 intfdata->send_setup(port);
  72 }
  73 EXPORT_SYMBOL(usb_wwan_set_termios);
  74
  75 int usb_wwan_tiocmget(struct tty_struct *tty)
  76 {
  77         struct usb_serial_port *port = tty->driver_data;
  78         unsigned int value;
  79         struct usb_wwan_port_private *portdata;
  80
  81         portdata = usb_get_serial_port_data(port);
  82
  83         value = ((portdata->rts_state) ? TIOCM_RTS : 0) |
  84             ((portdata->dtr_state) ? TIOCM_DTR : 0) |
  85             ((portdata->cts_state) ? TIOCM_CTS : 0) |
  86             ((portdata->dsr_state) ? TIOCM_DSR : 0) |
  87             ((portdata->dcd_state) ? TIOCM_CAR : 0) |
  88             ((portdata->ri_state) ? TIOCM_RNG : 0);
  89
  90         return value;
  91 }
  92 EXPORT_SYMBOL(usb_wwan_tiocmget);
  93
  94 int usb_wwan_tiocmset(struct tty_struct *tty,
  95                       unsigned int set, unsigned int clear)
  96 {
  97         struct usb_serial_port *port = tty->driver_data;
  98         struct usb_wwan_port_private *portdata;
  99         struct usb_wwan_intf_private *intfdata;
 100
 101         portdata = usb_get_serial_port_data(port);
 102         intfdata = port->serial->private;
 103
 104         if (!intfdata->send_setup)
 105                 return -EINVAL;
 106
 107         /* FIXME: what locks portdata fields ? */
 108         if (set & TIOCM_RTS)
 109                 portdata->rts_state = 1;
 110         if (set & TIOCM_DTR)
 111                 portdata->dtr_state = 1;
 112
 113         if (clear & TIOCM_RTS)
 114                 portdata->rts_state = 0;
 115         if (clear & TIOCM_DTR)
 116                 portdata->dtr_state = 0;
 117         return intfdata->send_setup(port);
 118 }
 119 EXPORT_SYMBOL(usb_wwan_tiocmset);
 120
 121 static int get_serial_info(struct usb_serial_port *port,
 122                            struct serial_struct __user *retinfo)
 123 {
 124         struct serial_struct tmp;
 125
 126         if (!retinfo)
 127                 return -EFAULT;
 128
 129         memset(&tmp, 0, sizeof(tmp));
 130         tmp.line            = port->serial->minor;
 131         tmp.port            = port->number;
 132         tmp.baud_base       = tty_get_baud_rate(port->port.tty);
 133         tmp.close_delay     = port->port.close_delay / 10;
 134         tmp.closing_wait    = port->port.closing_wait == ASYNC_CLOSING_WAIT_NONE ?
 135                                  ASYNC_CLOSING_WAIT_NONE :
 136                                  port->port.closing_wait / 10;
 137
 138         if (copy_to_user(retinfo, &tmp, sizeof(*retinfo)))
 139                 return -EFAULT;
 140         return 0;
 141 }
 142
 143 static int set_serial_info(struct usb_serial_port *port,
 144                            struct serial_struct __user *newinfo)
 145 {
 146         struct serial_struct new_serial;
 147         unsigned int closing_wait, close_delay;
 148         int retval = 0;
 149
 150         if (copy_from_user(&new_serial, newinfo, sizeof(new_serial)))
 151                 return -EFAULT;
 152
 153         close_delay = new_serial.close_delay * 10;
 154         closing_wait = new_serial.closing_wait == ASYNC_CLOSING_WAIT_NONE ?
 155                         ASYNC_CLOSING_WAIT_NONE : new_serial.closing_wait * 10;
 156
 157         mutex_lock(&port->port.mutex);
 158
 159         if (!capable(CAP_SYS_ADMIN)) {
 160                 if ((close_delay != port->port.close_delay) ||
 161                     (closing_wait != port->port.closing_wait))
 162                         retval = -EPERM;
 163                 else
 164                         retval = -EOPNOTSUPP;
 165         } else {
 166                 port->port.close_delay  = close_delay;
 167                 port->port.closing_wait = closing_wait;
 168         }
 169
 170         mutex_unlock(&port->port.mutex);
 171         return retval;
 172 }
 173
 174 int usb_wwan_ioctl(struct tty_struct *tty,
 175                    unsigned int cmd, unsigned long arg)
 176 {
 177         struct usb_serial_port *port = tty->driver_data;
 178
 179         dev_dbg(&port->dev, "%s cmd 0x%04x\n", __func__, cmd);
 180
 181         switch (cmd) {
 182         case TIOCGSERIAL:
 183                 return get_serial_info(port,
 184                                        (struct serial_struct __user *) arg);
 185         case TIOCSSERIAL:
 186                 return set_serial_info(port,
 187                                        (struct serial_struct __user *) arg);
 188         default:
 189                 break;
 190         }
 191
 192         dev_dbg(&port->dev, "%s arg not supported\n", __func__);
 193
 194         return -ENOIOCTLCMD;
 195 }
 196 EXPORT_SYMBOL(usb_wwan_ioctl);
 197
 198 /* Write */
 199 int usb_wwan_write(struct tty_struct *tty, struct usb_serial_port *port,
 200                    const unsigned char *buf, int count)
 201 {
 202         struct usb_wwan_port_private *portdata;
 203         struct usb_wwan_intf_private *intfdata;
 204         int i;
 205         int left, todo;
 206         struct urb *this_urb = NULL;    /* spurious */
 207         int err;
 208         unsigned long flags;
 209
 210         portdata = usb_get_serial_port_data(port);
 211         intfdata = port->serial->private;
 212
 213         dev_dbg(&port->dev, "%s: write (%d chars)\n", __func__, count);
 214
 215         i = 0;
 216         left = count;
 217         for (i = 0; left > 0 && i < N_OUT_URB; i++) {
 218                 todo = left;
 219                 if (todo > OUT_BUFLEN)
 220                         todo = OUT_BUFLEN;
 221
 222                 this_urb = portdata->out_urbs[i];
 223                 if (test_and_set_bit(i, &portdata->out_busy)) {
 224                         if (time_before(jiffies,
 225                                         portdata->tx_start_time[i] + 10 * HZ))
 226                                 continue;
 227                         usb_unlink_urb(this_urb);
 228                         continue;
 229                 }
 230                 dev_dbg(&port->dev, "%s: endpoint %d buf %d\n", __func__,
 231                         usb_pipeendpoint(this_urb->pipe), i);
 232
 233                 err = usb_autopm_get_interface_async(port->serial->interface);
 234                 if (err < 0)
 235                         break;
 236
 237                 /* send the data */
 238                 memcpy(this_urb->transfer_buffer, buf, todo);
 239                 this_urb->transfer_buffer_length = todo;
 240
 241                 spin_lock_irqsave(&intfdata->susp_lock, flags);
 242                 if (intfdata->suspended) {
 243                         usb_anchor_urb(this_urb, &portdata->delayed);
 244                         spin_unlock_irqrestore(&intfdata->susp_lock, flags);
 245                 } else {
 246                         intfdata->in_flight++;
 247                         spin_unlock_irqrestore(&intfdata->susp_lock, flags);
 248                         err = usb_submit_urb(this_urb, GFP_ATOMIC);
 249                         if (err) {
 250                                 dev_dbg(&port->dev,
 251                                         "usb_submit_urb %p (write bulk) failed (%d)\n",
 252                                         this_urb, err);
 253                                 clear_bit(i, &portdata->out_busy);
 254                                 spin_lock_irqsave(&intfdata->susp_lock, flags);
 255                                 intfdata->in_flight--;
 256                                 spin_unlock_irqrestore(&intfdata->susp_lock,
 257                                                        flags);
 258                                 usb_autopm_put_interface_async(port->serial->interface);
 259                                 break;
 260                         }
 261                 }
 262
 263                 portdata->tx_start_time[i] = jiffies;
 264                 buf += todo;
 265                 left -= todo;
 266         }
 267
 268         count -= left;
 269         dev_dbg(&port->dev, "%s: wrote (did %d)\n", __func__, count);
 270         return count;
 271 }
 272 EXPORT_SYMBOL(usb_wwan_write);
 273
 274 static void usb_wwan_indat_callback(struct urb *urb)
 275 {
 276         int err;
 277         int endpoint;
 278         struct usb_serial_port *port;
 279         struct tty_struct *tty;
 280         struct device *dev;
 281         unsigned char *data = urb->transfer_buffer;
 282         int status = urb->status;
 283
 284         endpoint = usb_pipeendpoint(urb->pipe);
 285         port = urb->context;
 286         dev = &port->dev;
 287
 288         if (status) {
 289                 dev_dbg(dev, "%s: nonzero status: %d on endpoint %02x.\n",
 290                         __func__, status, endpoint);
 291         } else {
 292                 tty = tty_port_tty_get(&port->port);
 293                 if (tty) {
 294                         if (urb->actual_length) {
 295                                 tty_insert_flip_string(tty, data,
 296                                                 urb->actual_length);
 297                                 tty_flip_buffer_push(tty);
 298                         } else
 299                                 dev_dbg(dev, "%s: empty read urb received\n", __func__);
 300                         tty_kref_put(tty);
 301                 }
 302
 303                 /* Resubmit urb so we continue receiving */
 304                 err = usb_submit_urb(urb, GFP_ATOMIC);
 305                 if (err) {
 306                         if (err != -EPERM) {
 307                                 dev_err(dev, "%s: resubmit read urb failed. (%d)\n", __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         dev_dbg(&port->dev, "%s: %d\n", __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         dev_dbg(&port->dev, "%s: %d\n", __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                         dev_dbg(&port->dev, "%s: submit urb %d failed (%d) %d\n",
 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                 dev_dbg(&serial->interface->dev,
 462                         "%s: alloc for endpoint %d failed.\n", __func__,
 463                         endpoint);
 464                 return NULL;
 465         }
 466
 467         /* Fill URB using supplied data. */
 468         usb_fill_bulk_urb(urb, serial->dev,
 469                           usb_sndbulkpipe(serial->dev, endpoint) | dir,
 470                           buf, len, callback, ctx);
 471
 472         return urb;
 473 }
 474
 475 /* Setup urbs */
 476 static void usb_wwan_setup_urbs(struct usb_serial *serial)
 477 {
 478         int i, j;
 479         struct usb_serial_port *port;
 480         struct usb_wwan_port_private *portdata;
 481
 482         for (i = 0; i < serial->num_ports; i++) {
 483                 port = serial->port[i];
 484                 portdata = usb_get_serial_port_data(port);
 485
 486                 /* Do indat endpoints first */
 487                 for (j = 0; j < N_IN_URB; ++j) {
 488                         portdata->in_urbs[j] = usb_wwan_setup_urb(serial,
 489                                                                   port->
 490                                                                   bulk_in_endpointAddress,
 491                                                                   USB_DIR_IN,
 492                                                                   port,
 493                                                                   portdata->
 494                                                                   in_buffer[j],
 495                                                                   IN_BUFLEN,
 496                                                                   usb_wwan_indat_callback);
 497                 }
 498
 499                 /* outdat endpoints */
 500                 for (j = 0; j < N_OUT_URB; ++j) {
 501                         portdata->out_urbs[j] = usb_wwan_setup_urb(serial,
 502                                                                    port->
 503                                                                    bulk_out_endpointAddress,
 504                                                                    USB_DIR_OUT,
 505                                                                    port,
 506                                                                    portdata->
 507                                                                    out_buffer
 508                                                                    [j],
 509                                                                    OUT_BUFLEN,
 510                                                                    usb_wwan_outdat_callback);
 511                 }
 512         }
 513 }
 514
 515 int usb_wwan_startup(struct usb_serial *serial)
 516 {
 517         int i, j, err;
 518         struct usb_serial_port *port;
 519         struct usb_wwan_port_private *portdata;
 520         u8 *buffer;
 521
 522         /* Now setup per port private data */
 523         for (i = 0; i < serial->num_ports; i++) {
 524                 port = serial->port[i];
 525                 portdata = kzalloc(sizeof(*portdata), GFP_KERNEL);
 526                 if (!portdata) {
 527                         dev_dbg(&port->dev, "%s: kmalloc for usb_wwan_port_private (%d) failed!.\n",
 528                                 __func__, i);
 529                         return 1;
 530                 }
 531                 init_usb_anchor(&portdata->delayed);
 532
 533                 for (j = 0; j < N_IN_URB; j++) {
 534                         buffer = (u8 *) __get_free_page(GFP_KERNEL);
 535                         if (!buffer)
 536                                 goto bail_out_error;
 537                         portdata->in_buffer[j] = buffer;
 538                 }
 539
 540                 for (j = 0; j < N_OUT_URB; j++) {
 541                         buffer = kmalloc(OUT_BUFLEN, GFP_KERNEL);
 542                         if (!buffer)
 543                                 goto bail_out_error2;
 544                         portdata->out_buffer[j] = buffer;
 545                 }
 546
 547                 usb_set_serial_port_data(port, portdata);
 548
 549                 if (!port->interrupt_in_urb)
 550                         continue;
 551                 err = usb_submit_urb(port->interrupt_in_urb, GFP_KERNEL);
 552                 if (err)
 553                         dev_dbg(&port->dev, "%s: submit irq_in urb failed %d\n",
 554                                 __func__, err);
 555         }
 556         usb_wwan_setup_urbs(serial);
 557         return 0;
 558
 559 bail_out_error2:
 560         for (j = 0; j < N_OUT_URB; j++)
 561                 kfree(portdata->out_buffer[j]);
 562 bail_out_error:
 563         for (j = 0; j < N_IN_URB; j++)
 564                 if (portdata->in_buffer[j])
 565                         free_page((unsigned long)portdata->in_buffer[j]);
 566         kfree(portdata);
 567         return 1;
 568 }
 569 EXPORT_SYMBOL(usb_wwan_startup);
 570
 571 int usb_wwan_port_remove(struct usb_serial_port *port)
 572 {
 573         int i;
 574         struct usb_wwan_port_private *portdata;
 575
 576         portdata = usb_get_serial_port_data(port);
 577         usb_set_serial_port_data(port, NULL);
 578
 579         /* Stop reading/writing urbs and free them */
 580         for (i = 0; i < N_IN_URB; i++) {
 581                 usb_kill_urb(portdata->in_urbs[i]);
 582                 usb_free_urb(portdata->in_urbs[i]);
 583                 free_page((unsigned long)portdata->in_buffer[i]);
 584         }
 585         for (i = 0; i < N_OUT_URB; i++) {
 586                 usb_kill_urb(portdata->out_urbs[i]);
 587                 usb_free_urb(portdata->out_urbs[i]);
 588                 kfree(portdata->out_buffer[i]);
 589         }
 590
 591         /* Now free port private data */
 592         kfree(portdata);
 593         return 0;
 594 }
 595 EXPORT_SYMBOL(usb_wwan_port_remove);
 596
 597 #ifdef CONFIG_PM
 598 static void stop_read_write_urbs(struct usb_serial *serial)
 599 {
 600         int i, j;
 601         struct usb_serial_port *port;
 602         struct usb_wwan_port_private *portdata;
 603
 604         /* Stop reading/writing urbs */
 605         for (i = 0; i < serial->num_ports; ++i) {
 606                 port = serial->port[i];
 607                 portdata = usb_get_serial_port_data(port);
 608                 if (!portdata)
 609                         continue;
 610                 for (j = 0; j < N_IN_URB; j++)
 611                         usb_kill_urb(portdata->in_urbs[j]);
 612                 for (j = 0; j < N_OUT_URB; j++)
 613                         usb_kill_urb(portdata->out_urbs[j]);
 614         }
 615 }
 616
 617 int usb_wwan_suspend(struct usb_serial *serial, pm_message_t message)
 618 {
 619         struct usb_wwan_intf_private *intfdata = serial->private;
 620         int b;
 621
 622         if (PMSG_IS_AUTO(message)) {
 623                 spin_lock_irq(&intfdata->susp_lock);
 624                 b = intfdata->in_flight;
 625                 spin_unlock_irq(&intfdata->susp_lock);
 626
 627                 if (b)
 628                         return -EBUSY;
 629         }
 630
 631         spin_lock_irq(&intfdata->susp_lock);
 632         intfdata->suspended = 1;
 633         spin_unlock_irq(&intfdata->susp_lock);
 634         stop_read_write_urbs(serial);
 635
 636         return 0;
 637 }
 638 EXPORT_SYMBOL(usb_wwan_suspend);
 639
 640 static void unbusy_queued_urb(struct urb *urb, struct usb_wwan_port_private *portdata)
 641 {
 642         int i;
 643
 644         for (i = 0; i < N_OUT_URB; i++) {
 645                 if (urb == portdata->out_urbs[i]) {
 646                         clear_bit(i, &portdata->out_busy);
 647                         break;
 648                 }
 649         }
 650 }
 651
 652 static void play_delayed(struct usb_serial_port *port)
 653 {
 654         struct usb_wwan_intf_private *data;
 655         struct usb_wwan_port_private *portdata;
 656         struct urb *urb;
 657         int err;
 658
 659         portdata = usb_get_serial_port_data(port);
 660         data = port->serial->private;
 661         while ((urb = usb_get_from_anchor(&portdata->delayed))) {
 662                 err = usb_submit_urb(urb, GFP_ATOMIC);
 663                 if (!err) {
 664                         data->in_flight++;
 665                 } else {
 666                         /* we have to throw away the rest */
 667                         do {
 668                                 unbusy_queued_urb(urb, portdata);
 669                                 usb_autopm_put_interface_no_suspend(port->serial->interface);
 670                         } while ((urb = usb_get_from_anchor(&portdata->delayed)));
 671                         break;
 672                 }
 673         }
 674 }
 675
 676 int usb_wwan_resume(struct usb_serial *serial)
 677 {
 678         int i, j;
 679         struct usb_serial_port *port;
 680         struct usb_wwan_intf_private *intfdata = serial->private;
 681         struct usb_wwan_port_private *portdata;
 682         struct urb *urb;
 683         int err = 0;
 684
 685         /* get the interrupt URBs resubmitted unconditionally */
 686         for (i = 0; i < serial->num_ports; i++) {
 687                 port = serial->port[i];
 688                 if (!port->interrupt_in_urb) {
 689                         dev_dbg(&port->dev, "%s: No interrupt URB for port\n", __func__);
 690                         continue;
 691                 }
 692                 err = usb_submit_urb(port->interrupt_in_urb, GFP_NOIO);
 693                 dev_dbg(&port->dev, "Submitted interrupt URB for port (result %d)\n", err);
 694                 if (err < 0) {
 695                         dev_err(&port->dev, "%s: Error %d for interrupt URB\n",
 696                                 __func__, err);
 697                         goto err_out;
 698                 }
 699         }
 700
 701         for (i = 0; i < serial->num_ports; i++) {
 702                 /* walk all ports */
 703                 port = serial->port[i];
 704                 portdata = usb_get_serial_port_data(port);
 705
 706                 /* skip closed ports */
 707                 spin_lock_irq(&intfdata->susp_lock);
 708                 if (!portdata || !portdata->opened) {
 709                         spin_unlock_irq(&intfdata->susp_lock);
 710                         continue;
 711                 }
 712
 713                 for (j = 0; j < N_IN_URB; j++) {
 714                         urb = portdata->in_urbs[j];
 715                         err = usb_submit_urb(urb, GFP_ATOMIC);
 716                         if (err < 0) {
 717                                 dev_err(&port->dev, "%s: Error %d for bulk URB %d\n",
 718                                         __func__, err, i);
 719                                 spin_unlock_irq(&intfdata->susp_lock);
 720                                 goto err_out;
 721                         }
 722                 }
 723                 play_delayed(port);
 724                 spin_unlock_irq(&intfdata->susp_lock);
 725         }
 726         spin_lock_irq(&intfdata->susp_lock);
 727         intfdata->suspended = 0;
 728         spin_unlock_irq(&intfdata->susp_lock);
 729 err_out:
 730         return err;
 731 }
 732 EXPORT_SYMBOL(usb_wwan_resume);
 733 #endif
 734
 735 MODULE_AUTHOR(DRIVER_AUTHOR);
 736 MODULE_DESCRIPTION(DRIVER_DESC);
 737 MODULE_VERSION(DRIVER_VERSION);
 738 MODULE_LICENSE("GPL");