drivers/usb/serial/usb_wwan.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 /*
   3   USB Driver layer for GSM modems
   4
   5   Copyright (C) 2005  Matthias Urlichs <smurf@smurf.noris.de>
   6
   7   Portions copied from the Keyspan driver by Hugh Blemings <hugh@blemings.org>
   8
   9   History: see the git log.
  10
  11   Work sponsored by: Sigos GmbH, Germany <info@sigos.de>
  12
  13   This driver exists because the "normal" serial driver doesn't work too well
  14   with GSM modems. Issues:
  15   - data loss -- one single Receive URB is not nearly enough
  16   - controlling the baud rate doesn't make sense
  17 */
  18
  19 #define DRIVER_AUTHOR "Matthias Urlichs <smurf@smurf.noris.de>"
  20 #define DRIVER_DESC "USB Driver for GSM modems"
  21
  22 #include <linux/kernel.h>
  23 #include <linux/jiffies.h>
  24 #include <linux/errno.h>
  25 #include <linux/slab.h>
  26 #include <linux/tty.h>
  27 #include <linux/tty_flip.h>
  28 #include <linux/module.h>
  29 #include <linux/bitops.h>
  30 #include <linux/uaccess.h>
  31 #include <linux/usb.h>
  32 #include <linux/usb/serial.h>
  33 #include <linux/serial.h>
  34 #include "usb-wwan.h"
  35
  36 /*
  37  * Generate DTR/RTS signals on the port using the SET_CONTROL_LINE_STATE request
  38  * in CDC ACM.
  39  */
  40 static int usb_wwan_send_setup(struct usb_serial_port *port)
  41 {
  42         struct usb_serial *serial = port->serial;
  43         struct usb_wwan_port_private *portdata;
  44         int val = 0;
  45         int ifnum;
  46         int res;
  47
  48         portdata = usb_get_serial_port_data(port);
  49
  50         if (portdata->dtr_state)
  51                 val |= 0x01;
  52         if (portdata->rts_state)
  53                 val |= 0x02;
  54
  55         ifnum = serial->interface->cur_altsetting->desc.bInterfaceNumber;
  56
  57         res = usb_autopm_get_interface(serial->interface);
  58         if (res)
  59                 return res;
  60
  61         res = usb_control_msg(serial->dev, usb_sndctrlpipe(serial->dev, 0),
  62                                 0x22, 0x21, val, ifnum, NULL, 0,
  63                                 USB_CTRL_SET_TIMEOUT);
  64
  65         usb_autopm_put_interface(port->serial->interface);
  66
  67         return res;
  68 }
  69
  70 void usb_wwan_dtr_rts(struct usb_serial_port *port, int on)
  71 {
  72         struct usb_wwan_port_private *portdata;
  73         struct usb_wwan_intf_private *intfdata;
  74
  75         intfdata = usb_get_serial_data(port->serial);
  76
  77         if (!intfdata->use_send_setup)
  78                 return;
  79
  80         portdata = usb_get_serial_port_data(port);
  81         /* FIXME: locking */
  82         portdata->rts_state = on;
  83         portdata->dtr_state = on;
  84
  85         usb_wwan_send_setup(port);
  86 }
  87 EXPORT_SYMBOL(usb_wwan_dtr_rts);
  88
  89 int usb_wwan_tiocmget(struct tty_struct *tty)
  90 {
  91         struct usb_serial_port *port = tty->driver_data;
  92         unsigned int value;
  93         struct usb_wwan_port_private *portdata;
  94
  95         portdata = usb_get_serial_port_data(port);
  96
  97         value = ((portdata->rts_state) ? TIOCM_RTS : 0) |
  98             ((portdata->dtr_state) ? TIOCM_DTR : 0) |
  99             ((portdata->cts_state) ? TIOCM_CTS : 0) |
 100             ((portdata->dsr_state) ? TIOCM_DSR : 0) |
 101             ((portdata->dcd_state) ? TIOCM_CAR : 0) |
 102             ((portdata->ri_state) ? TIOCM_RNG : 0);
 103
 104         return value;
 105 }
 106 EXPORT_SYMBOL(usb_wwan_tiocmget);
 107
 108 int usb_wwan_tiocmset(struct tty_struct *tty,
 109                       unsigned int set, unsigned int clear)
 110 {
 111         struct usb_serial_port *port = tty->driver_data;
 112         struct usb_wwan_port_private *portdata;
 113         struct usb_wwan_intf_private *intfdata;
 114
 115         portdata = usb_get_serial_port_data(port);
 116         intfdata = usb_get_serial_data(port->serial);
 117
 118         if (!intfdata->use_send_setup)
 119                 return -EINVAL;
 120
 121         /* FIXME: what locks portdata fields ? */
 122         if (set & TIOCM_RTS)
 123                 portdata->rts_state = 1;
 124         if (set & TIOCM_DTR)
 125                 portdata->dtr_state = 1;
 126
 127         if (clear & TIOCM_RTS)
 128                 portdata->rts_state = 0;
 129         if (clear & TIOCM_DTR)
 130                 portdata->dtr_state = 0;
 131         return usb_wwan_send_setup(port);
 132 }
 133 EXPORT_SYMBOL(usb_wwan_tiocmset);
 134
 135 int usb_wwan_get_serial_info(struct tty_struct *tty,
 136                            struct serial_struct *ss)
 137 {
 138         struct usb_serial_port *port = tty->driver_data;
 139
 140         ss->line            = port->minor;
 141         ss->port            = port->port_number;
 142         ss->baud_base       = tty_get_baud_rate(port->port.tty);
 143         ss->close_delay     = port->port.close_delay / 10;
 144         ss->closing_wait    = port->port.closing_wait == ASYNC_CLOSING_WAIT_NONE ?
 145                                  ASYNC_CLOSING_WAIT_NONE :
 146                                  port->port.closing_wait / 10;
 147         return 0;
 148 }
 149 EXPORT_SYMBOL(usb_wwan_get_serial_info);
 150
 151 int usb_wwan_set_serial_info(struct tty_struct *tty,
 152                            struct serial_struct *ss)
 153 {
 154         struct usb_serial_port *port = tty->driver_data;
 155         unsigned int closing_wait, close_delay;
 156         int retval = 0;
 157
 158         close_delay = ss->close_delay * 10;
 159         closing_wait = ss->closing_wait == ASYNC_CLOSING_WAIT_NONE ?
 160                         ASYNC_CLOSING_WAIT_NONE : ss->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 EXPORT_SYMBOL(usb_wwan_set_serial_info);
 179
 180 int usb_wwan_write(struct tty_struct *tty, struct usb_serial_port *port,
 181                    const unsigned char *buf, int count)
 182 {
 183         struct usb_wwan_port_private *portdata;
 184         struct usb_wwan_intf_private *intfdata;
 185         int i;
 186         int left, todo;
 187         struct urb *this_urb = NULL;    /* spurious */
 188         int err;
 189         unsigned long flags;
 190
 191         portdata = usb_get_serial_port_data(port);
 192         intfdata = usb_get_serial_data(port->serial);
 193
 194         dev_dbg(&port->dev, "%s: write (%d chars)\n", __func__, count);
 195
 196         i = 0;
 197         left = count;
 198         for (i = 0; left > 0 && i < N_OUT_URB; i++) {
 199                 todo = left;
 200                 if (todo > OUT_BUFLEN)
 201                         todo = OUT_BUFLEN;
 202
 203                 this_urb = portdata->out_urbs[i];
 204                 if (test_and_set_bit(i, &portdata->out_busy)) {
 205                         if (time_before(jiffies,
 206                                         portdata->tx_start_time[i] + 10 * HZ))
 207                                 continue;
 208                         usb_unlink_urb(this_urb);
 209                         continue;
 210                 }
 211                 dev_dbg(&port->dev, "%s: endpoint %d buf %d\n", __func__,
 212                         usb_pipeendpoint(this_urb->pipe), i);
 213
 214                 err = usb_autopm_get_interface_async(port->serial->interface);
 215                 if (err < 0) {
 216                         clear_bit(i, &portdata->out_busy);
 217                         break;
 218                 }
 219
 220                 /* send the data */
 221                 memcpy(this_urb->transfer_buffer, buf, todo);
 222                 this_urb->transfer_buffer_length = todo;
 223
 224                 spin_lock_irqsave(&intfdata->susp_lock, flags);
 225                 if (intfdata->suspended) {
 226                         usb_anchor_urb(this_urb, &portdata->delayed);
 227                         spin_unlock_irqrestore(&intfdata->susp_lock, flags);
 228                 } else {
 229                         intfdata->in_flight++;
 230                         spin_unlock_irqrestore(&intfdata->susp_lock, flags);
 231                         err = usb_submit_urb(this_urb, GFP_ATOMIC);
 232                         if (err) {
 233                                 dev_err(&port->dev,
 234                                         "%s: submit urb %d failed: %d\n",
 235                                         __func__, i, err);
 236                                 clear_bit(i, &portdata->out_busy);
 237                                 spin_lock_irqsave(&intfdata->susp_lock, flags);
 238                                 intfdata->in_flight--;
 239                                 spin_unlock_irqrestore(&intfdata->susp_lock,
 240                                                        flags);
 241                                 usb_autopm_put_interface_async(port->serial->interface);
 242                                 break;
 243                         }
 244                 }
 245
 246                 portdata->tx_start_time[i] = jiffies;
 247                 buf += todo;
 248                 left -= todo;
 249         }
 250
 251         count -= left;
 252         dev_dbg(&port->dev, "%s: wrote (did %d)\n", __func__, count);
 253         return count;
 254 }
 255 EXPORT_SYMBOL(usb_wwan_write);
 256
 257 static void usb_wwan_indat_callback(struct urb *urb)
 258 {
 259         int err;
 260         int endpoint;
 261         struct usb_serial_port *port;
 262         struct device *dev;
 263         unsigned char *data = urb->transfer_buffer;
 264         int status = urb->status;
 265
 266         endpoint = usb_pipeendpoint(urb->pipe);
 267         port = urb->context;
 268         dev = &port->dev;
 269
 270         if (status) {
 271                 dev_dbg(dev, "%s: nonzero status: %d on endpoint %02x.\n",
 272                         __func__, status, endpoint);
 273
 274                 /* don't resubmit on fatal errors */
 275                 if (status == -ESHUTDOWN || status == -ENOENT)
 276                         return;
 277         } else {
 278                 if (urb->actual_length) {
 279                         tty_insert_flip_string(&port->port, data,
 280                                         urb->actual_length);
 281                         tty_flip_buffer_push(&port->port);
 282                 } else
 283                         dev_dbg(dev, "%s: empty read urb received\n", __func__);
 284         }
 285         /* Resubmit urb so we continue receiving */
 286         err = usb_submit_urb(urb, GFP_ATOMIC);
 287         if (err) {
 288                 if (err != -EPERM && err != -ENODEV) {
 289                         dev_err(dev, "%s: resubmit read urb failed. (%d)\n",
 290                                 __func__, err);
 291                         /* busy also in error unless we are killed */
 292                         usb_mark_last_busy(port->serial->dev);
 293                 }
 294         } else {
 295                 usb_mark_last_busy(port->serial->dev);
 296         }
 297 }
 298
 299 static void usb_wwan_outdat_callback(struct urb *urb)
 300 {
 301         struct usb_serial_port *port;
 302         struct usb_wwan_port_private *portdata;
 303         struct usb_wwan_intf_private *intfdata;
 304         unsigned long flags;
 305         int i;
 306
 307         port = urb->context;
 308         intfdata = usb_get_serial_data(port->serial);
 309
 310         usb_serial_port_softint(port);
 311         usb_autopm_put_interface_async(port->serial->interface);
 312         portdata = usb_get_serial_port_data(port);
 313         spin_lock_irqsave(&intfdata->susp_lock, flags);
 314         intfdata->in_flight--;
 315         spin_unlock_irqrestore(&intfdata->susp_lock, flags);
 316
 317         for (i = 0; i < N_OUT_URB; ++i) {
 318                 if (portdata->out_urbs[i] == urb) {
 319                         smp_mb__before_atomic();
 320                         clear_bit(i, &portdata->out_busy);
 321                         break;
 322                 }
 323         }
 324 }
 325
 326 int usb_wwan_write_room(struct tty_struct *tty)
 327 {
 328         struct usb_serial_port *port = tty->driver_data;
 329         struct usb_wwan_port_private *portdata;
 330         int i;
 331         int data_len = 0;
 332         struct urb *this_urb;
 333
 334         portdata = usb_get_serial_port_data(port);
 335
 336         for (i = 0; i < N_OUT_URB; i++) {
 337                 this_urb = portdata->out_urbs[i];
 338                 if (this_urb && !test_bit(i, &portdata->out_busy))
 339                         data_len += OUT_BUFLEN;
 340         }
 341
 342         dev_dbg(&port->dev, "%s: %d\n", __func__, data_len);
 343         return data_len;
 344 }
 345 EXPORT_SYMBOL(usb_wwan_write_room);
 346
 347 int usb_wwan_chars_in_buffer(struct tty_struct *tty)
 348 {
 349         struct usb_serial_port *port = tty->driver_data;
 350         struct usb_wwan_port_private *portdata;
 351         int i;
 352         int data_len = 0;
 353         struct urb *this_urb;
 354
 355         portdata = usb_get_serial_port_data(port);
 356
 357         for (i = 0; i < N_OUT_URB; i++) {
 358                 this_urb = portdata->out_urbs[i];
 359                 /* FIXME: This locking is insufficient as this_urb may
 360                    go unused during the test */
 361                 if (this_urb && test_bit(i, &portdata->out_busy))
 362                         data_len += this_urb->transfer_buffer_length;
 363         }
 364         dev_dbg(&port->dev, "%s: %d\n", __func__, data_len);
 365         return data_len;
 366 }
 367 EXPORT_SYMBOL(usb_wwan_chars_in_buffer);
 368
 369 int usb_wwan_open(struct tty_struct *tty, struct usb_serial_port *port)
 370 {
 371         struct usb_wwan_port_private *portdata;
 372         struct usb_wwan_intf_private *intfdata;
 373         struct usb_serial *serial = port->serial;
 374         int i, err;
 375         struct urb *urb;
 376
 377         portdata = usb_get_serial_port_data(port);
 378         intfdata = usb_get_serial_data(serial);
 379
 380         if (port->interrupt_in_urb) {
 381                 err = usb_submit_urb(port->interrupt_in_urb, GFP_KERNEL);
 382                 if (err) {
 383                         dev_err(&port->dev, "%s: submit int urb failed: %d\n",
 384                                 __func__, err);
 385                 }
 386         }
 387
 388         /* Start reading from the IN endpoint */
 389         for (i = 0; i < N_IN_URB; i++) {
 390                 urb = portdata->in_urbs[i];
 391                 if (!urb)
 392                         continue;
 393                 err = usb_submit_urb(urb, GFP_KERNEL);
 394                 if (err) {
 395                         dev_err(&port->dev,
 396                                 "%s: submit read urb %d failed: %d\n",
 397                                 __func__, i, err);
 398                 }
 399         }
 400
 401         spin_lock_irq(&intfdata->susp_lock);
 402         if (++intfdata->open_ports == 1)
 403                 serial->interface->needs_remote_wakeup = 1;
 404         spin_unlock_irq(&intfdata->susp_lock);
 405         /* this balances a get in the generic USB serial code */
 406         usb_autopm_put_interface(serial->interface);
 407
 408         return 0;
 409 }
 410 EXPORT_SYMBOL(usb_wwan_open);
 411
 412 static void unbusy_queued_urb(struct urb *urb,
 413                                         struct usb_wwan_port_private *portdata)
 414 {
 415         int i;
 416
 417         for (i = 0; i < N_OUT_URB; i++) {
 418                 if (urb == portdata->out_urbs[i]) {
 419                         clear_bit(i, &portdata->out_busy);
 420                         break;
 421                 }
 422         }
 423 }
 424
 425 void usb_wwan_close(struct usb_serial_port *port)
 426 {
 427         int i;
 428         struct usb_serial *serial = port->serial;
 429         struct usb_wwan_port_private *portdata;
 430         struct usb_wwan_intf_private *intfdata = usb_get_serial_data(serial);
 431         struct urb *urb;
 432
 433         portdata = usb_get_serial_port_data(port);
 434
 435         /*
 436          * Need to take susp_lock to make sure port is not already being
 437          * resumed, but no need to hold it due to initialized
 438          */
 439         spin_lock_irq(&intfdata->susp_lock);
 440         if (--intfdata->open_ports == 0)
 441                 serial->interface->needs_remote_wakeup = 0;
 442         spin_unlock_irq(&intfdata->susp_lock);
 443
 444         for (;;) {
 445                 urb = usb_get_from_anchor(&portdata->delayed);
 446                 if (!urb)
 447                         break;
 448                 unbusy_queued_urb(urb, portdata);
 449                 usb_autopm_put_interface_async(serial->interface);
 450         }
 451
 452         for (i = 0; i < N_IN_URB; i++)
 453                 usb_kill_urb(portdata->in_urbs[i]);
 454         for (i = 0; i < N_OUT_URB; i++)
 455                 usb_kill_urb(portdata->out_urbs[i]);
 456         usb_kill_urb(port->interrupt_in_urb);
 457
 458         usb_autopm_get_interface_no_resume(serial->interface);
 459 }
 460 EXPORT_SYMBOL(usb_wwan_close);
 461
 462 static struct urb *usb_wwan_setup_urb(struct usb_serial_port *port,
 463                                       int endpoint,
 464                                       int dir, void *ctx, char *buf, int len,
 465                                       void (*callback) (struct urb *))
 466 {
 467         struct usb_serial *serial = port->serial;
 468         struct usb_wwan_intf_private *intfdata = usb_get_serial_data(serial);
 469         struct urb *urb;
 470
 471         urb = usb_alloc_urb(0, GFP_KERNEL);     /* No ISO */
 472         if (!urb)
 473                 return NULL;
 474
 475         usb_fill_bulk_urb(urb, serial->dev,
 476                           usb_sndbulkpipe(serial->dev, endpoint) | dir,
 477                           buf, len, callback, ctx);
 478
 479         if (intfdata->use_zlp && dir == USB_DIR_OUT)
 480                 urb->transfer_flags |= URB_ZERO_PACKET;
 481
 482         return urb;
 483 }
 484
 485 int usb_wwan_port_probe(struct usb_serial_port *port)
 486 {
 487         struct usb_wwan_port_private *portdata;
 488         struct urb *urb;
 489         u8 *buffer;
 490         int i;
 491
 492         if (!port->bulk_in_size || !port->bulk_out_size)
 493                 return -ENODEV;
 494
 495         portdata = kzalloc(sizeof(*portdata), GFP_KERNEL);
 496         if (!portdata)
 497                 return -ENOMEM;
 498
 499         init_usb_anchor(&portdata->delayed);
 500
 501         for (i = 0; i < N_IN_URB; i++) {
 502                 buffer = (u8 *)__get_free_page(GFP_KERNEL);
 503                 if (!buffer)
 504                         goto bail_out_error;
 505                 portdata->in_buffer[i] = buffer;
 506
 507                 urb = usb_wwan_setup_urb(port, port->bulk_in_endpointAddress,
 508                                                 USB_DIR_IN, port,
 509                                                 buffer, IN_BUFLEN,
 510                                                 usb_wwan_indat_callback);
 511                 portdata->in_urbs[i] = urb;
 512         }
 513
 514         for (i = 0; i < N_OUT_URB; i++) {
 515                 buffer = kmalloc(OUT_BUFLEN, GFP_KERNEL);
 516                 if (!buffer)
 517                         goto bail_out_error2;
 518                 portdata->out_buffer[i] = buffer;
 519
 520                 urb = usb_wwan_setup_urb(port, port->bulk_out_endpointAddress,
 521                                                 USB_DIR_OUT, port,
 522                                                 buffer, OUT_BUFLEN,
 523                                                 usb_wwan_outdat_callback);
 524                 portdata->out_urbs[i] = urb;
 525         }
 526
 527         usb_set_serial_port_data(port, portdata);
 528
 529         return 0;
 530
 531 bail_out_error2:
 532         for (i = 0; i < N_OUT_URB; i++) {
 533                 usb_free_urb(portdata->out_urbs[i]);
 534                 kfree(portdata->out_buffer[i]);
 535         }
 536 bail_out_error:
 537         for (i = 0; i < N_IN_URB; i++) {
 538                 usb_free_urb(portdata->in_urbs[i]);
 539                 free_page((unsigned long)portdata->in_buffer[i]);
 540         }
 541         kfree(portdata);
 542
 543         return -ENOMEM;
 544 }
 545 EXPORT_SYMBOL_GPL(usb_wwan_port_probe);
 546
 547 int usb_wwan_port_remove(struct usb_serial_port *port)
 548 {
 549         int i;
 550         struct usb_wwan_port_private *portdata;
 551
 552         portdata = usb_get_serial_port_data(port);
 553         usb_set_serial_port_data(port, NULL);
 554
 555         for (i = 0; i < N_IN_URB; i++) {
 556                 usb_free_urb(portdata->in_urbs[i]);
 557                 free_page((unsigned long)portdata->in_buffer[i]);
 558         }
 559         for (i = 0; i < N_OUT_URB; i++) {
 560                 usb_free_urb(portdata->out_urbs[i]);
 561                 kfree(portdata->out_buffer[i]);
 562         }
 563
 564         kfree(portdata);
 565
 566         return 0;
 567 }
 568 EXPORT_SYMBOL(usb_wwan_port_remove);
 569
 570 #ifdef CONFIG_PM
 571 static void stop_urbs(struct usb_serial *serial)
 572 {
 573         int i, j;
 574         struct usb_serial_port *port;
 575         struct usb_wwan_port_private *portdata;
 576
 577         for (i = 0; i < serial->num_ports; ++i) {
 578                 port = serial->port[i];
 579                 portdata = usb_get_serial_port_data(port);
 580                 if (!portdata)
 581                         continue;
 582                 for (j = 0; j < N_IN_URB; j++)
 583                         usb_kill_urb(portdata->in_urbs[j]);
 584                 for (j = 0; j < N_OUT_URB; j++)
 585                         usb_kill_urb(portdata->out_urbs[j]);
 586                 usb_kill_urb(port->interrupt_in_urb);
 587         }
 588 }
 589
 590 int usb_wwan_suspend(struct usb_serial *serial, pm_message_t message)
 591 {
 592         struct usb_wwan_intf_private *intfdata = usb_get_serial_data(serial);
 593
 594         spin_lock_irq(&intfdata->susp_lock);
 595         if (PMSG_IS_AUTO(message)) {
 596                 if (intfdata->in_flight) {
 597                         spin_unlock_irq(&intfdata->susp_lock);
 598                         return -EBUSY;
 599                 }
 600         }
 601         intfdata->suspended = 1;
 602         spin_unlock_irq(&intfdata->susp_lock);
 603
 604         stop_urbs(serial);
 605
 606         return 0;
 607 }
 608 EXPORT_SYMBOL(usb_wwan_suspend);
 609
 610 /* Caller must hold susp_lock. */
 611 static int usb_wwan_submit_delayed_urbs(struct usb_serial_port *port)
 612 {
 613         struct usb_serial *serial = port->serial;
 614         struct usb_wwan_intf_private *data = usb_get_serial_data(serial);
 615         struct usb_wwan_port_private *portdata;
 616         struct urb *urb;
 617         int err_count = 0;
 618         int err;
 619
 620         portdata = usb_get_serial_port_data(port);
 621
 622         for (;;) {
 623                 urb = usb_get_from_anchor(&portdata->delayed);
 624                 if (!urb)
 625                         break;
 626
 627                 err = usb_submit_urb(urb, GFP_ATOMIC);
 628                 if (err) {
 629                         dev_err(&port->dev, "%s: submit urb failed: %d\n",
 630                                         __func__, err);
 631                         err_count++;
 632                         unbusy_queued_urb(urb, portdata);
 633                         usb_autopm_put_interface_async(serial->interface);
 634                         continue;
 635                 }
 636                 data->in_flight++;
 637         }
 638
 639         if (err_count)
 640                 return -EIO;
 641
 642         return 0;
 643 }
 644
 645 int usb_wwan_resume(struct usb_serial *serial)
 646 {
 647         int i, j;
 648         struct usb_serial_port *port;
 649         struct usb_wwan_intf_private *intfdata = usb_get_serial_data(serial);
 650         struct usb_wwan_port_private *portdata;
 651         struct urb *urb;
 652         int err;
 653         int err_count = 0;
 654
 655         spin_lock_irq(&intfdata->susp_lock);
 656         for (i = 0; i < serial->num_ports; i++) {
 657                 port = serial->port[i];
 658
 659                 if (!tty_port_initialized(&port->port))
 660                         continue;
 661
 662                 portdata = usb_get_serial_port_data(port);
 663
 664                 if (port->interrupt_in_urb) {
 665                         err = usb_submit_urb(port->interrupt_in_urb,
 666                                         GFP_ATOMIC);
 667                         if (err) {
 668                                 dev_err(&port->dev,
 669                                         "%s: submit int urb failed: %d\n",
 670                                         __func__, err);
 671                                 err_count++;
 672                         }
 673                 }
 674
 675                 err = usb_wwan_submit_delayed_urbs(port);
 676                 if (err)
 677                         err_count++;
 678
 679                 for (j = 0; j < N_IN_URB; j++) {
 680                         urb = portdata->in_urbs[j];
 681                         err = usb_submit_urb(urb, GFP_ATOMIC);
 682                         if (err < 0) {
 683                                 dev_err(&port->dev,
 684                                         "%s: submit read urb %d failed: %d\n",
 685                                         __func__, i, err);
 686                                 err_count++;
 687                         }
 688                 }
 689         }
 690         intfdata->suspended = 0;
 691         spin_unlock_irq(&intfdata->susp_lock);
 692
 693         if (err_count)
 694                 return -EIO;
 695
 696         return 0;
 697 }
 698 EXPORT_SYMBOL(usb_wwan_resume);
 699 #endif
 700
 701 MODULE_AUTHOR(DRIVER_AUTHOR);
 702 MODULE_DESCRIPTION(DRIVER_DESC);
 703 MODULE_LICENSE("GPL v2");