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         } else {
 274                 if (urb->actual_length) {
 275                         tty_insert_flip_string(&port->port, data,
 276                                         urb->actual_length);
 277                         tty_flip_buffer_push(&port->port);
 278                 } else
 279                         dev_dbg(dev, "%s: empty read urb received\n", __func__);
 280         }
 281         /* Resubmit urb so we continue receiving */
 282         err = usb_submit_urb(urb, GFP_ATOMIC);
 283         if (err) {
 284                 if (err != -EPERM && err != -ENODEV) {
 285                         dev_err(dev, "%s: resubmit read urb failed. (%d)\n",
 286                                 __func__, err);
 287                         /* busy also in error unless we are killed */
 288                         usb_mark_last_busy(port->serial->dev);
 289                 }
 290         } else {
 291                 usb_mark_last_busy(port->serial->dev);
 292         }
 293 }
 294
 295 static void usb_wwan_outdat_callback(struct urb *urb)
 296 {
 297         struct usb_serial_port *port;
 298         struct usb_wwan_port_private *portdata;
 299         struct usb_wwan_intf_private *intfdata;
 300         unsigned long flags;
 301         int i;
 302
 303         port = urb->context;
 304         intfdata = usb_get_serial_data(port->serial);
 305
 306         usb_serial_port_softint(port);
 307         usb_autopm_put_interface_async(port->serial->interface);
 308         portdata = usb_get_serial_port_data(port);
 309         spin_lock_irqsave(&intfdata->susp_lock, flags);
 310         intfdata->in_flight--;
 311         spin_unlock_irqrestore(&intfdata->susp_lock, flags);
 312
 313         for (i = 0; i < N_OUT_URB; ++i) {
 314                 if (portdata->out_urbs[i] == urb) {
 315                         smp_mb__before_atomic();
 316                         clear_bit(i, &portdata->out_busy);
 317                         break;
 318                 }
 319         }
 320 }
 321
 322 int usb_wwan_write_room(struct tty_struct *tty)
 323 {
 324         struct usb_serial_port *port = tty->driver_data;
 325         struct usb_wwan_port_private *portdata;
 326         int i;
 327         int data_len = 0;
 328         struct urb *this_urb;
 329
 330         portdata = usb_get_serial_port_data(port);
 331
 332         for (i = 0; i < N_OUT_URB; i++) {
 333                 this_urb = portdata->out_urbs[i];
 334                 if (this_urb && !test_bit(i, &portdata->out_busy))
 335                         data_len += OUT_BUFLEN;
 336         }
 337
 338         dev_dbg(&port->dev, "%s: %d\n", __func__, data_len);
 339         return data_len;
 340 }
 341 EXPORT_SYMBOL(usb_wwan_write_room);
 342
 343 int usb_wwan_chars_in_buffer(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                 /* FIXME: This locking is insufficient as this_urb may
 356                    go unused during the test */
 357                 if (this_urb && test_bit(i, &portdata->out_busy))
 358                         data_len += this_urb->transfer_buffer_length;
 359         }
 360         dev_dbg(&port->dev, "%s: %d\n", __func__, data_len);
 361         return data_len;
 362 }
 363 EXPORT_SYMBOL(usb_wwan_chars_in_buffer);
 364
 365 int usb_wwan_open(struct tty_struct *tty, struct usb_serial_port *port)
 366 {
 367         struct usb_wwan_port_private *portdata;
 368         struct usb_wwan_intf_private *intfdata;
 369         struct usb_serial *serial = port->serial;
 370         int i, err;
 371         struct urb *urb;
 372
 373         portdata = usb_get_serial_port_data(port);
 374         intfdata = usb_get_serial_data(serial);
 375
 376         if (port->interrupt_in_urb) {
 377                 err = usb_submit_urb(port->interrupt_in_urb, GFP_KERNEL);
 378                 if (err) {
 379                         dev_err(&port->dev, "%s: submit int urb failed: %d\n",
 380                                 __func__, err);
 381                 }
 382         }
 383
 384         /* Start reading from the IN endpoint */
 385         for (i = 0; i < N_IN_URB; i++) {
 386                 urb = portdata->in_urbs[i];
 387                 if (!urb)
 388                         continue;
 389                 err = usb_submit_urb(urb, GFP_KERNEL);
 390                 if (err) {
 391                         dev_err(&port->dev,
 392                                 "%s: submit read urb %d failed: %d\n",
 393                                 __func__, i, err);
 394                 }
 395         }
 396
 397         spin_lock_irq(&intfdata->susp_lock);
 398         if (++intfdata->open_ports == 1)
 399                 serial->interface->needs_remote_wakeup = 1;
 400         spin_unlock_irq(&intfdata->susp_lock);
 401         /* this balances a get in the generic USB serial code */
 402         usb_autopm_put_interface(serial->interface);
 403
 404         return 0;
 405 }
 406 EXPORT_SYMBOL(usb_wwan_open);
 407
 408 static void unbusy_queued_urb(struct urb *urb,
 409                                         struct usb_wwan_port_private *portdata)
 410 {
 411         int i;
 412
 413         for (i = 0; i < N_OUT_URB; i++) {
 414                 if (urb == portdata->out_urbs[i]) {
 415                         clear_bit(i, &portdata->out_busy);
 416                         break;
 417                 }
 418         }
 419 }
 420
 421 void usb_wwan_close(struct usb_serial_port *port)
 422 {
 423         int i;
 424         struct usb_serial *serial = port->serial;
 425         struct usb_wwan_port_private *portdata;
 426         struct usb_wwan_intf_private *intfdata = usb_get_serial_data(serial);
 427         struct urb *urb;
 428
 429         portdata = usb_get_serial_port_data(port);
 430
 431         /*
 432          * Need to take susp_lock to make sure port is not already being
 433          * resumed, but no need to hold it due to initialized
 434          */
 435         spin_lock_irq(&intfdata->susp_lock);
 436         if (--intfdata->open_ports == 0)
 437                 serial->interface->needs_remote_wakeup = 0;
 438         spin_unlock_irq(&intfdata->susp_lock);
 439
 440         for (;;) {
 441                 urb = usb_get_from_anchor(&portdata->delayed);
 442                 if (!urb)
 443                         break;
 444                 unbusy_queued_urb(urb, portdata);
 445                 usb_autopm_put_interface_async(serial->interface);
 446         }
 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_kill_urb(port->interrupt_in_urb);
 453
 454         usb_autopm_get_interface_no_resume(serial->interface);
 455 }
 456 EXPORT_SYMBOL(usb_wwan_close);
 457
 458 static struct urb *usb_wwan_setup_urb(struct usb_serial_port *port,
 459                                       int endpoint,
 460                                       int dir, void *ctx, char *buf, int len,
 461                                       void (*callback) (struct urb *))
 462 {
 463         struct usb_serial *serial = port->serial;
 464         struct usb_wwan_intf_private *intfdata = usb_get_serial_data(serial);
 465         struct urb *urb;
 466
 467         urb = usb_alloc_urb(0, GFP_KERNEL);     /* No ISO */
 468         if (!urb)
 469                 return NULL;
 470
 471         usb_fill_bulk_urb(urb, serial->dev,
 472                           usb_sndbulkpipe(serial->dev, endpoint) | dir,
 473                           buf, len, callback, ctx);
 474
 475         if (intfdata->use_zlp && dir == USB_DIR_OUT)
 476                 urb->transfer_flags |= URB_ZERO_PACKET;
 477
 478         return urb;
 479 }
 480
 481 int usb_wwan_port_probe(struct usb_serial_port *port)
 482 {
 483         struct usb_wwan_port_private *portdata;
 484         struct urb *urb;
 485         u8 *buffer;
 486         int i;
 487
 488         if (!port->bulk_in_size || !port->bulk_out_size)
 489                 return -ENODEV;
 490
 491         portdata = kzalloc(sizeof(*portdata), GFP_KERNEL);
 492         if (!portdata)
 493                 return -ENOMEM;
 494
 495         init_usb_anchor(&portdata->delayed);
 496
 497         for (i = 0; i < N_IN_URB; i++) {
 498                 buffer = (u8 *)__get_free_page(GFP_KERNEL);
 499                 if (!buffer)
 500                         goto bail_out_error;
 501                 portdata->in_buffer[i] = buffer;
 502
 503                 urb = usb_wwan_setup_urb(port, port->bulk_in_endpointAddress,
 504                                                 USB_DIR_IN, port,
 505                                                 buffer, IN_BUFLEN,
 506                                                 usb_wwan_indat_callback);
 507                 portdata->in_urbs[i] = urb;
 508         }
 509
 510         for (i = 0; i < N_OUT_URB; i++) {
 511                 buffer = kmalloc(OUT_BUFLEN, GFP_KERNEL);
 512                 if (!buffer)
 513                         goto bail_out_error2;
 514                 portdata->out_buffer[i] = buffer;
 515
 516                 urb = usb_wwan_setup_urb(port, port->bulk_out_endpointAddress,
 517                                                 USB_DIR_OUT, port,
 518                                                 buffer, OUT_BUFLEN,
 519                                                 usb_wwan_outdat_callback);
 520                 portdata->out_urbs[i] = urb;
 521         }
 522
 523         usb_set_serial_port_data(port, portdata);
 524
 525         return 0;
 526
 527 bail_out_error2:
 528         for (i = 0; i < N_OUT_URB; i++) {
 529                 usb_free_urb(portdata->out_urbs[i]);
 530                 kfree(portdata->out_buffer[i]);
 531         }
 532 bail_out_error:
 533         for (i = 0; i < N_IN_URB; i++) {
 534                 usb_free_urb(portdata->in_urbs[i]);
 535                 free_page((unsigned long)portdata->in_buffer[i]);
 536         }
 537         kfree(portdata);
 538
 539         return -ENOMEM;
 540 }
 541 EXPORT_SYMBOL_GPL(usb_wwan_port_probe);
 542
 543 int usb_wwan_port_remove(struct usb_serial_port *port)
 544 {
 545         int i;
 546         struct usb_wwan_port_private *portdata;
 547
 548         portdata = usb_get_serial_port_data(port);
 549         usb_set_serial_port_data(port, NULL);
 550
 551         for (i = 0; i < N_IN_URB; i++) {
 552                 usb_free_urb(portdata->in_urbs[i]);
 553                 free_page((unsigned long)portdata->in_buffer[i]);
 554         }
 555         for (i = 0; i < N_OUT_URB; i++) {
 556                 usb_free_urb(portdata->out_urbs[i]);
 557                 kfree(portdata->out_buffer[i]);
 558         }
 559
 560         kfree(portdata);
 561
 562         return 0;
 563 }
 564 EXPORT_SYMBOL(usb_wwan_port_remove);
 565
 566 #ifdef CONFIG_PM
 567 static void stop_urbs(struct usb_serial *serial)
 568 {
 569         int i, j;
 570         struct usb_serial_port *port;
 571         struct usb_wwan_port_private *portdata;
 572
 573         for (i = 0; i < serial->num_ports; ++i) {
 574                 port = serial->port[i];
 575                 portdata = usb_get_serial_port_data(port);
 576                 if (!portdata)
 577                         continue;
 578                 for (j = 0; j < N_IN_URB; j++)
 579                         usb_kill_urb(portdata->in_urbs[j]);
 580                 for (j = 0; j < N_OUT_URB; j++)
 581                         usb_kill_urb(portdata->out_urbs[j]);
 582                 usb_kill_urb(port->interrupt_in_urb);
 583         }
 584 }
 585
 586 int usb_wwan_suspend(struct usb_serial *serial, pm_message_t message)
 587 {
 588         struct usb_wwan_intf_private *intfdata = usb_get_serial_data(serial);
 589
 590         spin_lock_irq(&intfdata->susp_lock);
 591         if (PMSG_IS_AUTO(message)) {
 592                 if (intfdata->in_flight) {
 593                         spin_unlock_irq(&intfdata->susp_lock);
 594                         return -EBUSY;
 595                 }
 596         }
 597         intfdata->suspended = 1;
 598         spin_unlock_irq(&intfdata->susp_lock);
 599
 600         stop_urbs(serial);
 601
 602         return 0;
 603 }
 604 EXPORT_SYMBOL(usb_wwan_suspend);
 605
 606 /* Caller must hold susp_lock. */
 607 static int usb_wwan_submit_delayed_urbs(struct usb_serial_port *port)
 608 {
 609         struct usb_serial *serial = port->serial;
 610         struct usb_wwan_intf_private *data = usb_get_serial_data(serial);
 611         struct usb_wwan_port_private *portdata;
 612         struct urb *urb;
 613         int err_count = 0;
 614         int err;
 615
 616         portdata = usb_get_serial_port_data(port);
 617
 618         for (;;) {
 619                 urb = usb_get_from_anchor(&portdata->delayed);
 620                 if (!urb)
 621                         break;
 622
 623                 err = usb_submit_urb(urb, GFP_ATOMIC);
 624                 if (err) {
 625                         dev_err(&port->dev, "%s: submit urb failed: %d\n",
 626                                         __func__, err);
 627                         err_count++;
 628                         unbusy_queued_urb(urb, portdata);
 629                         usb_autopm_put_interface_async(serial->interface);
 630                         continue;
 631                 }
 632                 data->in_flight++;
 633         }
 634
 635         if (err_count)
 636                 return -EIO;
 637
 638         return 0;
 639 }
 640
 641 int usb_wwan_resume(struct usb_serial *serial)
 642 {
 643         int i, j;
 644         struct usb_serial_port *port;
 645         struct usb_wwan_intf_private *intfdata = usb_get_serial_data(serial);
 646         struct usb_wwan_port_private *portdata;
 647         struct urb *urb;
 648         int err;
 649         int err_count = 0;
 650
 651         spin_lock_irq(&intfdata->susp_lock);
 652         for (i = 0; i < serial->num_ports; i++) {
 653                 port = serial->port[i];
 654
 655                 if (!tty_port_initialized(&port->port))
 656                         continue;
 657
 658                 portdata = usb_get_serial_port_data(port);
 659
 660                 if (port->interrupt_in_urb) {
 661                         err = usb_submit_urb(port->interrupt_in_urb,
 662                                         GFP_ATOMIC);
 663                         if (err) {
 664                                 dev_err(&port->dev,
 665                                         "%s: submit int urb failed: %d\n",
 666                                         __func__, err);
 667                                 err_count++;
 668                         }
 669                 }
 670
 671                 err = usb_wwan_submit_delayed_urbs(port);
 672                 if (err)
 673                         err_count++;
 674
 675                 for (j = 0; j < N_IN_URB; j++) {
 676                         urb = portdata->in_urbs[j];
 677                         err = usb_submit_urb(urb, GFP_ATOMIC);
 678                         if (err < 0) {
 679                                 dev_err(&port->dev,
 680                                         "%s: submit read urb %d failed: %d\n",
 681                                         __func__, i, err);
 682                                 err_count++;
 683                         }
 684                 }
 685         }
 686         intfdata->suspended = 0;
 687         spin_unlock_irq(&intfdata->susp_lock);
 688
 689         if (err_count)
 690                 return -EIO;
 691
 692         return 0;
 693 }
 694 EXPORT_SYMBOL(usb_wwan_resume);
 695 #endif
 696
 697 MODULE_AUTHOR(DRIVER_AUTHOR);
 698 MODULE_DESCRIPTION(DRIVER_DESC);
 699 MODULE_LICENSE("GPL v2");