drivers/usb/serial/usb_wwan.c

   1 /*
   2   USB Driver layer for GSM modems
   3
   4   Copyright (C) 2005  Matthias Urlichs <smurf@smurf.noris.de>
   5
   6   This driver is free software; you can redistribute it and/or modify
   7   it under the terms of Version 2 of the GNU General Public License as
   8   published by the Free Software Foundation.
   9
  10   Portions copied from the Keyspan driver by Hugh Blemings <hugh@blemings.org>
  11
  12   History: see the git log.
  13
  14   Work sponsored by: Sigos GmbH, Germany <info@sigos.de>
  15
  16   This driver exists because the "normal" serial driver doesn't work too well
  17   with GSM modems. Issues:
  18   - data loss -- one single Receive URB is not nearly enough
  19   - controlling the baud rate doesn't make sense
  20 */
  21
  22 #define DRIVER_VERSION "v0.7.2"
  23 #define DRIVER_AUTHOR "Matthias Urlichs <smurf@smurf.noris.de>"
  24 #define DRIVER_DESC "USB Driver for GSM modems"
  25
  26 #include <linux/kernel.h>
  27 #include <linux/jiffies.h>
  28 #include <linux/errno.h>
  29 #include <linux/slab.h>
  30 #include <linux/tty.h>
  31 #include <linux/tty_flip.h>
  32 #include <linux/module.h>
  33 #include <linux/bitops.h>
  34 #include <linux/uaccess.h>
  35 #include <linux/usb.h>
  36 #include <linux/usb/serial.h>
  37 #include <linux/serial.h>
  38 #include "usb-wwan.h"
  39
  40 static int debug;
  41
  42 void usb_wwan_dtr_rts(struct usb_serial_port *port, int on)
  43 {
  44         struct usb_serial *serial = port->serial;
  45         struct usb_wwan_port_private *portdata;
  46
  47         struct usb_wwan_intf_private *intfdata;
  48
  49         dbg("%s", __func__);
  50
  51         intfdata = port->serial->private;
  52
  53         if (!intfdata->send_setup)
  54                 return;
  55
  56         portdata = usb_get_serial_port_data(port);
  57         mutex_lock(&serial->disc_mutex);
  58         portdata->rts_state = on;
  59         portdata->dtr_state = on;
  60         if (serial->dev)
  61                 intfdata->send_setup(port);
  62         mutex_unlock(&serial->disc_mutex);
  63 }
  64 EXPORT_SYMBOL(usb_wwan_dtr_rts);
  65
  66 void usb_wwan_set_termios(struct tty_struct *tty,
  67                           struct usb_serial_port *port,
  68                           struct ktermios *old_termios)
  69 {
  70         struct usb_wwan_intf_private *intfdata = port->serial->private;
  71
  72         dbg("%s", __func__);
  73
  74         /* Doesn't support option setting */
  75         tty_termios_copy_hw(tty->termios, old_termios);
  76
  77         if (intfdata->send_setup)
  78                 intfdata->send_setup(port);
  79 }
  80 EXPORT_SYMBOL(usb_wwan_set_termios);
  81
  82 int usb_wwan_tiocmget(struct tty_struct *tty, struct file *file)
  83 {
  84         struct usb_serial_port *port = tty->driver_data;
  85         unsigned int value;
  86         struct usb_wwan_port_private *portdata;
  87
  88         portdata = usb_get_serial_port_data(port);
  89
  90         value = ((portdata->rts_state) ? TIOCM_RTS : 0) |
  91             ((portdata->dtr_state) ? TIOCM_DTR : 0) |
  92             ((portdata->cts_state) ? TIOCM_CTS : 0) |
  93             ((portdata->dsr_state) ? TIOCM_DSR : 0) |
  94             ((portdata->dcd_state) ? TIOCM_CAR : 0) |
  95             ((portdata->ri_state) ? TIOCM_RNG : 0);
  96
  97         return value;
  98 }
  99 EXPORT_SYMBOL(usb_wwan_tiocmget);
 100
 101 int usb_wwan_tiocmset(struct tty_struct *tty, struct file *file,
 102                       unsigned int set, unsigned int clear)
 103 {
 104         struct usb_serial_port *port = tty->driver_data;
 105         struct usb_wwan_port_private *portdata;
 106         struct usb_wwan_intf_private *intfdata;
 107
 108         portdata = usb_get_serial_port_data(port);
 109         intfdata = port->serial->private;
 110
 111         if (!intfdata->send_setup)
 112                 return -EINVAL;
 113
 114         /* FIXME: what locks portdata fields ? */
 115         if (set & TIOCM_RTS)
 116                 portdata->rts_state = 1;
 117         if (set & TIOCM_DTR)
 118                 portdata->dtr_state = 1;
 119
 120         if (clear & TIOCM_RTS)
 121                 portdata->rts_state = 0;
 122         if (clear & TIOCM_DTR)
 123                 portdata->dtr_state = 0;
 124         return intfdata->send_setup(port);
 125 }
 126 EXPORT_SYMBOL(usb_wwan_tiocmset);
 127
 128 static int get_serial_info(struct usb_serial_port *port,
 129                            struct serial_struct __user *retinfo)
 130 {
 131         struct serial_struct tmp;
 132
 133         if (!retinfo)
 134                 return -EFAULT;
 135
 136         memset(&tmp, 0, sizeof(tmp));
 137         tmp.line            = port->serial->minor;
 138         tmp.port            = port->number;
 139         tmp.baud_base       = tty_get_baud_rate(port->port.tty);
 140         tmp.close_delay     = port->port.close_delay / 10;
 141         tmp.closing_wait    = port->port.closing_wait == ASYNC_CLOSING_WAIT_NONE ?
 142                                  ASYNC_CLOSING_WAIT_NONE :
 143                                  port->port.closing_wait / 10;
 144
 145         if (copy_to_user(retinfo, &tmp, sizeof(*retinfo)))
 146                 return -EFAULT;
 147         return 0;
 148 }
 149
 150 static int set_serial_info(struct usb_serial_port *port,
 151                            struct serial_struct __user *newinfo)
 152 {
 153         struct serial_struct new_serial;
 154         unsigned int closing_wait, close_delay;
 155         int retval = 0;
 156
 157         if (copy_from_user(&new_serial, newinfo, sizeof(new_serial)))
 158                 return -EFAULT;
 159
 160         close_delay = new_serial.close_delay * 10;
 161         closing_wait = new_serial.closing_wait == ASYNC_CLOSING_WAIT_NONE ?
 162                         ASYNC_CLOSING_WAIT_NONE : new_serial.closing_wait * 10;
 163
 164         mutex_lock(&port->port.mutex);
 165
 166         if (!capable(CAP_SYS_ADMIN)) {
 167                 if ((close_delay != port->port.close_delay) ||
 168                     (closing_wait != port->port.closing_wait))
 169                         retval = -EPERM;
 170                 else
 171                         retval = -EOPNOTSUPP;
 172         } else {
 173                 port->port.close_delay  = close_delay;
 174                 port->port.closing_wait = closing_wait;
 175         }
 176
 177         mutex_unlock(&port->port.mutex);
 178         return retval;
 179 }
 180
 181 int usb_wwan_ioctl(struct tty_struct *tty, struct file *file,
 182                    unsigned int cmd, unsigned long arg)
 183 {
 184         struct usb_serial_port *port = tty->driver_data;
 185
 186         dbg("%s cmd 0x%04x", __func__, cmd);
 187
 188         switch (cmd) {
 189         case TIOCGSERIAL:
 190                 return get_serial_info(port,
 191                                        (struct serial_struct __user *) arg);
 192         case TIOCSSERIAL:
 193                 return set_serial_info(port,
 194                                        (struct serial_struct __user *) arg);
 195         default:
 196                 break;
 197         }
 198
 199         dbg("%s arg not supported", __func__);
 200
 201         return -ENOIOCTLCMD;
 202 }
 203 EXPORT_SYMBOL(usb_wwan_ioctl);
 204
 205 /* Write */
 206 int usb_wwan_write(struct tty_struct *tty, struct usb_serial_port *port,
 207                    const unsigned char *buf, int count)
 208 {
 209         struct usb_wwan_port_private *portdata;
 210         struct usb_wwan_intf_private *intfdata;
 211         int i;
 212         int left, todo;
 213         struct urb *this_urb = NULL;    /* spurious */
 214         int err;
 215         unsigned long flags;
 216
 217         portdata = usb_get_serial_port_data(port);
 218         intfdata = port->serial->private;
 219
 220         dbg("%s: write (%d chars)", __func__, count);
 221
 222         i = 0;
 223         left = count;
 224         for (i = 0; left > 0 && i < N_OUT_URB; i++) {
 225                 todo = left;
 226                 if (todo > OUT_BUFLEN)
 227                         todo = OUT_BUFLEN;
 228
 229                 this_urb = portdata->out_urbs[i];
 230                 if (test_and_set_bit(i, &portdata->out_busy)) {
 231                         if (time_before(jiffies,
 232                                         portdata->tx_start_time[i] + 10 * HZ))
 233                                 continue;
 234                         usb_unlink_urb(this_urb);
 235                         continue;
 236                 }
 237                 dbg("%s: endpoint %d buf %d", __func__,
 238                     usb_pipeendpoint(this_urb->pipe), i);
 239
 240                 err = usb_autopm_get_interface_async(port->serial->interface);
 241                 if (err < 0)
 242                         break;
 243
 244                 /* send the data */
 245                 memcpy(this_urb->transfer_buffer, buf, todo);
 246                 this_urb->transfer_buffer_length = todo;
 247
 248                 spin_lock_irqsave(&intfdata->susp_lock, flags);
 249                 if (intfdata->suspended) {
 250                         usb_anchor_urb(this_urb, &portdata->delayed);
 251                         spin_unlock_irqrestore(&intfdata->susp_lock, flags);
 252                 } else {
 253                         intfdata->in_flight++;
 254                         spin_unlock_irqrestore(&intfdata->susp_lock, flags);
 255                         err = usb_submit_urb(this_urb, GFP_ATOMIC);
 256                         if (err) {
 257                                 dbg("usb_submit_urb %p (write bulk) failed "
 258                                     "(%d)", this_urb, err);
 259                                 clear_bit(i, &portdata->out_busy);
 260                                 spin_lock_irqsave(&intfdata->susp_lock, flags);
 261                                 intfdata->in_flight--;
 262                                 spin_unlock_irqrestore(&intfdata->susp_lock,
 263                                                        flags);
 264                                 usb_autopm_put_interface_async(port->serial->interface);
 265                                 break;
 266                         }
 267                 }
 268
 269                 portdata->tx_start_time[i] = jiffies;
 270                 buf += todo;
 271                 left -= todo;
 272         }
 273
 274         count -= left;
 275         dbg("%s: wrote (did %d)", __func__, count);
 276         return count;
 277 }
 278 EXPORT_SYMBOL(usb_wwan_write);
 279
 280 static void usb_wwan_indat_callback(struct urb *urb)
 281 {
 282         int err;
 283         int endpoint;
 284         struct usb_serial_port *port;
 285         struct tty_struct *tty;
 286         unsigned char *data = urb->transfer_buffer;
 287         int status = urb->status;
 288
 289         dbg("%s: %p", __func__, urb);
 290
 291         endpoint = usb_pipeendpoint(urb->pipe);
 292         port = urb->context;
 293
 294         if (status) {
 295                 dbg("%s: nonzero status: %d on endpoint %02x.",
 296                     __func__, status, endpoint);
 297         } else {
 298                 tty = tty_port_tty_get(&port->port);
 299                 if (urb->actual_length) {
 300                         tty_insert_flip_string(tty, data, 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                 /* Resubmit urb so we continue receiving */
 307                 if (status != -ESHUTDOWN) {
 308                         err = usb_submit_urb(urb, GFP_ATOMIC);
 309                         if (err) {
 310                                 if (err != -EPERM) {
 311                                         printk(KERN_ERR "%s: resubmit read urb failed. "
 312                                                 "(%d)", __func__, err);
 313                                         /* busy also in error unless we are killed */
 314                                         usb_mark_last_busy(port->serial->dev);
 315                                 }
 316                         } else {
 317                                 usb_mark_last_busy(port->serial->dev);
 318                         }
 319                 }
 320
 321         }
 322 }
 323
 324 static void usb_wwan_outdat_callback(struct urb *urb)
 325 {
 326         struct usb_serial_port *port;
 327         struct usb_wwan_port_private *portdata;
 328         struct usb_wwan_intf_private *intfdata;
 329         int i;
 330
 331         dbg("%s", __func__);
 332
 333         port = urb->context;
 334         intfdata = port->serial->private;
 335
 336         usb_serial_port_softint(port);
 337         usb_autopm_put_interface_async(port->serial->interface);
 338         portdata = usb_get_serial_port_data(port);
 339         spin_lock(&intfdata->susp_lock);
 340         intfdata->in_flight--;
 341         spin_unlock(&intfdata->susp_lock);
 342
 343         for (i = 0; i < N_OUT_URB; ++i) {
 344                 if (portdata->out_urbs[i] == urb) {
 345                         smp_mb__before_clear_bit();
 346                         clear_bit(i, &portdata->out_busy);
 347                         break;
 348                 }
 349         }
 350 }
 351
 352 int usb_wwan_write_room(struct tty_struct *tty)
 353 {
 354         struct usb_serial_port *port = tty->driver_data;
 355         struct usb_wwan_port_private *portdata;
 356         int i;
 357         int data_len = 0;
 358         struct urb *this_urb;
 359
 360         portdata = usb_get_serial_port_data(port);
 361
 362         for (i = 0; i < N_OUT_URB; i++) {
 363                 this_urb = portdata->out_urbs[i];
 364                 if (this_urb && !test_bit(i, &portdata->out_busy))
 365                         data_len += OUT_BUFLEN;
 366         }
 367
 368         dbg("%s: %d", __func__, data_len);
 369         return data_len;
 370 }
 371 EXPORT_SYMBOL(usb_wwan_write_room);
 372
 373 int usb_wwan_chars_in_buffer(struct tty_struct *tty)
 374 {
 375         struct usb_serial_port *port = tty->driver_data;
 376         struct usb_wwan_port_private *portdata;
 377         int i;
 378         int data_len = 0;
 379         struct urb *this_urb;
 380
 381         portdata = usb_get_serial_port_data(port);
 382
 383         for (i = 0; i < N_OUT_URB; i++) {
 384                 this_urb = portdata->out_urbs[i];
 385                 /* FIXME: This locking is insufficient as this_urb may
 386                    go unused during the test */
 387                 if (this_urb && test_bit(i, &portdata->out_busy))
 388                         data_len += this_urb->transfer_buffer_length;
 389         }
 390         dbg("%s: %d", __func__, data_len);
 391         return data_len;
 392 }
 393 EXPORT_SYMBOL(usb_wwan_chars_in_buffer);
 394
 395 int usb_wwan_open(struct tty_struct *tty, struct usb_serial_port *port)
 396 {
 397         struct usb_wwan_port_private *portdata;
 398         struct usb_wwan_intf_private *intfdata;
 399         struct usb_serial *serial = port->serial;
 400         int i, err;
 401         struct urb *urb;
 402
 403         portdata = usb_get_serial_port_data(port);
 404         intfdata = serial->private;
 405
 406         dbg("%s", __func__);
 407
 408         /* Start reading from the IN endpoint */
 409         for (i = 0; i < N_IN_URB; i++) {
 410                 urb = portdata->in_urbs[i];
 411                 if (!urb)
 412                         continue;
 413                 err = usb_submit_urb(urb, GFP_KERNEL);
 414                 if (err) {
 415                         dbg("%s: submit urb %d failed (%d) %d",
 416                             __func__, i, err, urb->transfer_buffer_length);
 417                 }
 418         }
 419
 420         if (intfdata->send_setup)
 421                 intfdata->send_setup(port);
 422
 423         serial->interface->needs_remote_wakeup = 1;
 424         spin_lock_irq(&intfdata->susp_lock);
 425         portdata->opened = 1;
 426         spin_unlock_irq(&intfdata->susp_lock);
 427         usb_autopm_put_interface(serial->interface);
 428
 429         return 0;
 430 }
 431 EXPORT_SYMBOL(usb_wwan_open);
 432
 433 void usb_wwan_close(struct usb_serial_port *port)
 434 {
 435         int i;
 436         struct usb_serial *serial = port->serial;
 437         struct usb_wwan_port_private *portdata;
 438         struct usb_wwan_intf_private *intfdata = port->serial->private;
 439
 440         dbg("%s", __func__);
 441         portdata = usb_get_serial_port_data(port);
 442
 443         if (serial->dev) {
 444                 /* Stop reading/writing urbs */
 445                 spin_lock_irq(&intfdata->susp_lock);
 446                 portdata->opened = 0;
 447                 spin_unlock_irq(&intfdata->susp_lock);
 448
 449                 for (i = 0; i < N_IN_URB; i++)
 450                         usb_kill_urb(portdata->in_urbs[i]);
 451                 for (i = 0; i < N_OUT_URB; i++)
 452                         usb_kill_urb(portdata->out_urbs[i]);
 453                 usb_autopm_get_interface(serial->interface);
 454                 serial->interface->needs_remote_wakeup = 0;
 455         }
 456 }
 457 EXPORT_SYMBOL(usb_wwan_close);
 458
 459 /* Helper functions used by usb_wwan_setup_urbs */
 460 static struct urb *usb_wwan_setup_urb(struct usb_serial *serial, int endpoint,
 461                                       int dir, void *ctx, char *buf, int len,
 462                                       void (*callback) (struct urb *))
 463 {
 464         struct urb *urb;
 465
 466         if (endpoint == -1)
 467                 return NULL;    /* endpoint not needed */
 468
 469         urb = usb_alloc_urb(0, GFP_KERNEL);     /* No ISO */
 470         if (urb == NULL) {
 471                 dbg("%s: alloc for endpoint %d failed.", __func__, endpoint);
 472                 return NULL;
 473         }
 474
 475         /* Fill URB using supplied data. */
 476         usb_fill_bulk_urb(urb, serial->dev,
 477                           usb_sndbulkpipe(serial->dev, endpoint) | dir,
 478                           buf, len, callback, ctx);
 479
 480         return urb;
 481 }
 482
 483 /* Setup urbs */
 484 static void usb_wwan_setup_urbs(struct usb_serial *serial)
 485 {
 486         int i, j;
 487         struct usb_serial_port *port;
 488         struct usb_wwan_port_private *portdata;
 489
 490         dbg("%s", __func__);
 491
 492         for (i = 0; i < serial->num_ports; i++) {
 493                 port = serial->port[i];
 494                 portdata = usb_get_serial_port_data(port);
 495
 496                 /* Do indat endpoints first */
 497                 for (j = 0; j < N_IN_URB; ++j) {
 498                         portdata->in_urbs[j] = usb_wwan_setup_urb(serial,
 499                                                                   port->
 500                                                                   bulk_in_endpointAddress,
 501                                                                   USB_DIR_IN,
 502                                                                   port,
 503                                                                   portdata->
 504                                                                   in_buffer[j],
 505                                                                   IN_BUFLEN,
 506                                                                   usb_wwan_indat_callback);
 507                 }
 508
 509                 /* outdat endpoints */
 510                 for (j = 0; j < N_OUT_URB; ++j) {
 511                         portdata->out_urbs[j] = usb_wwan_setup_urb(serial,
 512                                                                    port->
 513                                                                    bulk_out_endpointAddress,
 514                                                                    USB_DIR_OUT,
 515                                                                    port,
 516                                                                    portdata->
 517                                                                    out_buffer
 518                                                                    [j],
 519                                                                    OUT_BUFLEN,
 520                                                                    usb_wwan_outdat_callback);
 521                 }
 522         }
 523 }
 524
 525 int usb_wwan_startup(struct usb_serial *serial)
 526 {
 527         int i, j, err;
 528         struct usb_serial_port *port;
 529         struct usb_wwan_port_private *portdata;
 530         u8 *buffer;
 531
 532         dbg("%s", __func__);
 533
 534         /* Now setup per port private data */
 535         for (i = 0; i < serial->num_ports; i++) {
 536                 port = serial->port[i];
 537                 portdata = kzalloc(sizeof(*portdata), GFP_KERNEL);
 538                 if (!portdata) {
 539                         dbg("%s: kmalloc for usb_wwan_port_private (%d) failed!.",
 540                             __func__, i);
 541                         return 1;
 542                 }
 543                 init_usb_anchor(&portdata->delayed);
 544
 545                 for (j = 0; j < N_IN_URB; j++) {
 546                         buffer = (u8 *) __get_free_page(GFP_KERNEL);
 547                         if (!buffer)
 548                                 goto bail_out_error;
 549                         portdata->in_buffer[j] = buffer;
 550                 }
 551
 552                 for (j = 0; j < N_OUT_URB; j++) {
 553                         buffer = kmalloc(OUT_BUFLEN, GFP_KERNEL);
 554                         if (!buffer)
 555                                 goto bail_out_error2;
 556                         portdata->out_buffer[j] = buffer;
 557                 }
 558
 559                 usb_set_serial_port_data(port, portdata);
 560
 561                 if (!port->interrupt_in_urb)
 562                         continue;
 563                 err = usb_submit_urb(port->interrupt_in_urb, GFP_KERNEL);
 564                 if (err)
 565                         dbg("%s: submit irq_in urb failed %d", __func__, err);
 566         }
 567         usb_wwan_setup_urbs(serial);
 568         return 0;
 569
 570 bail_out_error2:
 571         for (j = 0; j < N_OUT_URB; j++)
 572                 kfree(portdata->out_buffer[j]);
 573 bail_out_error:
 574         for (j = 0; j < N_IN_URB; j++)
 575                 if (portdata->in_buffer[j])
 576                         free_page((unsigned long)portdata->in_buffer[j]);
 577         kfree(portdata);
 578         return 1;
 579 }
 580 EXPORT_SYMBOL(usb_wwan_startup);
 581
 582 static void stop_read_write_urbs(struct usb_serial *serial)
 583 {
 584         int i, j;
 585         struct usb_serial_port *port;
 586         struct usb_wwan_port_private *portdata;
 587
 588         /* Stop reading/writing urbs */
 589         for (i = 0; i < serial->num_ports; ++i) {
 590                 port = serial->port[i];
 591                 portdata = usb_get_serial_port_data(port);
 592                 for (j = 0; j < N_IN_URB; j++)
 593                         usb_kill_urb(portdata->in_urbs[j]);
 594                 for (j = 0; j < N_OUT_URB; j++)
 595                         usb_kill_urb(portdata->out_urbs[j]);
 596         }
 597 }
 598
 599 void usb_wwan_disconnect(struct usb_serial *serial)
 600 {
 601         dbg("%s", __func__);
 602
 603         stop_read_write_urbs(serial);
 604 }
 605 EXPORT_SYMBOL(usb_wwan_disconnect);
 606
 607 void usb_wwan_release(struct usb_serial *serial)
 608 {
 609         int i, j;
 610         struct usb_serial_port *port;
 611         struct usb_wwan_port_private *portdata;
 612
 613         dbg("%s", __func__);
 614
 615         /* Now free them */
 616         for (i = 0; i < serial->num_ports; ++i) {
 617                 port = serial->port[i];
 618                 portdata = usb_get_serial_port_data(port);
 619
 620                 for (j = 0; j < N_IN_URB; j++) {
 621                         usb_free_urb(portdata->in_urbs[j]);
 622                         free_page((unsigned long)
 623                                   portdata->in_buffer[j]);
 624                         portdata->in_urbs[j] = NULL;
 625                 }
 626                 for (j = 0; j < N_OUT_URB; j++) {
 627                         usb_free_urb(portdata->out_urbs[j]);
 628                         kfree(portdata->out_buffer[j]);
 629                         portdata->out_urbs[j] = NULL;
 630                 }
 631         }
 632
 633         /* Now free per port private data */
 634         for (i = 0; i < serial->num_ports; i++) {
 635                 port = serial->port[i];
 636                 kfree(usb_get_serial_port_data(port));
 637         }
 638 }
 639 EXPORT_SYMBOL(usb_wwan_release);
 640
 641 #ifdef CONFIG_PM
 642 int usb_wwan_suspend(struct usb_serial *serial, pm_message_t message)
 643 {
 644         struct usb_wwan_intf_private *intfdata = serial->private;
 645         int b;
 646
 647         dbg("%s entered", __func__);
 648
 649         if (message.event & PM_EVENT_AUTO) {
 650                 spin_lock_irq(&intfdata->susp_lock);
 651                 b = intfdata->in_flight;
 652                 spin_unlock_irq(&intfdata->susp_lock);
 653
 654                 if (b)
 655                         return -EBUSY;
 656         }
 657
 658         spin_lock_irq(&intfdata->susp_lock);
 659         intfdata->suspended = 1;
 660         spin_unlock_irq(&intfdata->susp_lock);
 661         stop_read_write_urbs(serial);
 662
 663         return 0;
 664 }
 665 EXPORT_SYMBOL(usb_wwan_suspend);
 666
 667 static void unbusy_queued_urb(struct urb *urb, struct usb_wwan_port_private *portdata)
 668 {
 669         int i;
 670
 671         for (i = 0; i < N_OUT_URB; i++) {
 672                 if (urb == portdata->out_urbs[i]) {
 673                         clear_bit(i, &portdata->out_busy);
 674                         break;
 675                 }
 676         }
 677 }
 678
 679 static void play_delayed(struct usb_serial_port *port)
 680 {
 681         struct usb_wwan_intf_private *data;
 682         struct usb_wwan_port_private *portdata;
 683         struct urb *urb;
 684         int err;
 685
 686         portdata = usb_get_serial_port_data(port);
 687         data = port->serial->private;
 688         while ((urb = usb_get_from_anchor(&portdata->delayed))) {
 689                 err = usb_submit_urb(urb, GFP_ATOMIC);
 690                 if (!err) {
 691                         data->in_flight++;
 692                 } else {
 693                         /* we have to throw away the rest */
 694                         do {
 695                                 unbusy_queued_urb(urb, portdata);
 696                                 //extremely dirty
 697                                 atomic_dec(&port->serial->interface->dev.power.usage_count);
 698                         } while ((urb = usb_get_from_anchor(&portdata->delayed)));
 699                         break;
 700                 }
 701         }
 702 }
 703
 704 int usb_wwan_resume(struct usb_serial *serial)
 705 {
 706         int i, j;
 707         struct usb_serial_port *port;
 708         struct usb_wwan_intf_private *intfdata = serial->private;
 709         struct usb_wwan_port_private *portdata;
 710         struct urb *urb;
 711         int err = 0;
 712
 713         dbg("%s entered", __func__);
 714         /* get the interrupt URBs resubmitted unconditionally */
 715         for (i = 0; i < serial->num_ports; i++) {
 716                 port = serial->port[i];
 717                 if (!port->interrupt_in_urb) {
 718                         dbg("%s: No interrupt URB for port %d", __func__, i);
 719                         continue;
 720                 }
 721                 err = usb_submit_urb(port->interrupt_in_urb, GFP_NOIO);
 722                 dbg("Submitted interrupt URB for port %d (result %d)", i, err);
 723                 if (err < 0) {
 724                         err("%s: Error %d for interrupt URB of port%d",
 725                             __func__, err, i);
 726                         goto err_out;
 727                 }
 728         }
 729
 730         for (i = 0; i < serial->num_ports; i++) {
 731                 /* walk all ports */
 732                 port = serial->port[i];
 733                 portdata = usb_get_serial_port_data(port);
 734
 735                 /* skip closed ports */
 736                 spin_lock_irq(&intfdata->susp_lock);
 737                 if (!portdata->opened) {
 738                         spin_unlock_irq(&intfdata->susp_lock);
 739                         continue;
 740                 }
 741
 742                 for (j = 0; j < N_IN_URB; j++) {
 743                         urb = portdata->in_urbs[j];
 744                         err = usb_submit_urb(urb, GFP_ATOMIC);
 745                         if (err < 0) {
 746                                 err("%s: Error %d for bulk URB %d",
 747                                     __func__, err, i);
 748                                 spin_unlock_irq(&intfdata->susp_lock);
 749                                 goto err_out;
 750                         }
 751                 }
 752                 play_delayed(port);
 753                 spin_unlock_irq(&intfdata->susp_lock);
 754         }
 755         spin_lock_irq(&intfdata->susp_lock);
 756         intfdata->suspended = 0;
 757         spin_unlock_irq(&intfdata->susp_lock);
 758 err_out:
 759         return err;
 760 }
 761 EXPORT_SYMBOL(usb_wwan_resume);
 762 #endif
 763
 764 MODULE_AUTHOR(DRIVER_AUTHOR);
 765 MODULE_DESCRIPTION(DRIVER_DESC);
 766 MODULE_VERSION(DRIVER_VERSION);
 767 MODULE_LICENSE("GPL");
 768
 769 module_param(debug, bool, S_IRUGO | S_IWUSR);
 770 MODULE_PARM_DESC(debug, "Debug messages");