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)
  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,
 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,
 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 (tty) {
 300                         if (urb->actual_length) {
 301                                 tty_insert_flip_string(tty, data,
 302                                                 urb->actual_length);
 303                                 tty_flip_buffer_push(tty);
 304                         } else
 305                                 dbg("%s: empty read urb received", __func__);
 306                         tty_kref_put(tty);
 307                 }
 308
 309                 /* Resubmit urb so we continue receiving */
 310                 if (status != -ESHUTDOWN) {
 311                         err = usb_submit_urb(urb, GFP_ATOMIC);
 312                         if (err) {
 313                                 if (err != -EPERM) {
 314                                         printk(KERN_ERR "%s: resubmit read urb failed. "
 315                                                 "(%d)", __func__, err);
 316                                         /* busy also in error unless we are killed */
 317                                         usb_mark_last_busy(port->serial->dev);
 318                                 }
 319                         } else {
 320                                 usb_mark_last_busy(port->serial->dev);
 321                         }
 322                 }
 323
 324         }
 325 }
 326
 327 static void usb_wwan_outdat_callback(struct urb *urb)
 328 {
 329         struct usb_serial_port *port;
 330         struct usb_wwan_port_private *portdata;
 331         struct usb_wwan_intf_private *intfdata;
 332         int i;
 333
 334         dbg("%s", __func__);
 335
 336         port = urb->context;
 337         intfdata = port->serial->private;
 338
 339         usb_serial_port_softint(port);
 340         usb_autopm_put_interface_async(port->serial->interface);
 341         portdata = usb_get_serial_port_data(port);
 342         spin_lock(&intfdata->susp_lock);
 343         intfdata->in_flight--;
 344         spin_unlock(&intfdata->susp_lock);
 345
 346         for (i = 0; i < N_OUT_URB; ++i) {
 347                 if (portdata->out_urbs[i] == urb) {
 348                         smp_mb__before_clear_bit();
 349                         clear_bit(i, &portdata->out_busy);
 350                         break;
 351                 }
 352         }
 353 }
 354
 355 int usb_wwan_write_room(struct tty_struct *tty)
 356 {
 357         struct usb_serial_port *port = tty->driver_data;
 358         struct usb_wwan_port_private *portdata;
 359         int i;
 360         int data_len = 0;
 361         struct urb *this_urb;
 362
 363         portdata = usb_get_serial_port_data(port);
 364
 365         for (i = 0; i < N_OUT_URB; i++) {
 366                 this_urb = portdata->out_urbs[i];
 367                 if (this_urb && !test_bit(i, &portdata->out_busy))
 368                         data_len += OUT_BUFLEN;
 369         }
 370
 371         dbg("%s: %d", __func__, data_len);
 372         return data_len;
 373 }
 374 EXPORT_SYMBOL(usb_wwan_write_room);
 375
 376 int usb_wwan_chars_in_buffer(struct tty_struct *tty)
 377 {
 378         struct usb_serial_port *port = tty->driver_data;
 379         struct usb_wwan_port_private *portdata;
 380         int i;
 381         int data_len = 0;
 382         struct urb *this_urb;
 383
 384         portdata = usb_get_serial_port_data(port);
 385
 386         for (i = 0; i < N_OUT_URB; i++) {
 387                 this_urb = portdata->out_urbs[i];
 388                 /* FIXME: This locking is insufficient as this_urb may
 389                    go unused during the test */
 390                 if (this_urb && test_bit(i, &portdata->out_busy))
 391                         data_len += this_urb->transfer_buffer_length;
 392         }
 393         dbg("%s: %d", __func__, data_len);
 394         return data_len;
 395 }
 396 EXPORT_SYMBOL(usb_wwan_chars_in_buffer);
 397
 398 int usb_wwan_open(struct tty_struct *tty, struct usb_serial_port *port)
 399 {
 400         struct usb_wwan_port_private *portdata;
 401         struct usb_wwan_intf_private *intfdata;
 402         struct usb_serial *serial = port->serial;
 403         int i, err;
 404         struct urb *urb;
 405
 406         portdata = usb_get_serial_port_data(port);
 407         intfdata = serial->private;
 408
 409         dbg("%s", __func__);
 410
 411         /* Start reading from the IN endpoint */
 412         for (i = 0; i < N_IN_URB; i++) {
 413                 urb = portdata->in_urbs[i];
 414                 if (!urb)
 415                         continue;
 416                 err = usb_submit_urb(urb, GFP_KERNEL);
 417                 if (err) {
 418                         dbg("%s: submit urb %d failed (%d) %d",
 419                             __func__, i, err, urb->transfer_buffer_length);
 420                 }
 421         }
 422
 423         if (intfdata->send_setup)
 424                 intfdata->send_setup(port);
 425
 426         serial->interface->needs_remote_wakeup = 1;
 427         spin_lock_irq(&intfdata->susp_lock);
 428         portdata->opened = 1;
 429         spin_unlock_irq(&intfdata->susp_lock);
 430         /* this balances a get in the generic USB serial code */
 431         usb_autopm_put_interface(serial->interface);
 432
 433         return 0;
 434 }
 435 EXPORT_SYMBOL(usb_wwan_open);
 436
 437 void usb_wwan_close(struct usb_serial_port *port)
 438 {
 439         int i;
 440         struct usb_serial *serial = port->serial;
 441         struct usb_wwan_port_private *portdata;
 442         struct usb_wwan_intf_private *intfdata = port->serial->private;
 443
 444         dbg("%s", __func__);
 445         portdata = usb_get_serial_port_data(port);
 446
 447         if (serial->dev) {
 448                 /* Stop reading/writing urbs */
 449                 spin_lock_irq(&intfdata->susp_lock);
 450                 portdata->opened = 0;
 451                 spin_unlock_irq(&intfdata->susp_lock);
 452
 453                 for (i = 0; i < N_IN_URB; i++)
 454                         usb_kill_urb(portdata->in_urbs[i]);
 455                 for (i = 0; i < N_OUT_URB; i++)
 456                         usb_kill_urb(portdata->out_urbs[i]);
 457                 /* balancing - important as an error cannot be handled*/
 458                 usb_autopm_get_interface_no_resume(serial->interface);
 459                 serial->interface->needs_remote_wakeup = 0;
 460         }
 461 }
 462 EXPORT_SYMBOL(usb_wwan_close);
 463
 464 /* Helper functions used by usb_wwan_setup_urbs */
 465 static struct urb *usb_wwan_setup_urb(struct usb_serial *serial, int endpoint,
 466                                       int dir, void *ctx, char *buf, int len,
 467                                       void (*callback) (struct urb *))
 468 {
 469         struct urb *urb;
 470
 471         if (endpoint == -1)
 472                 return NULL;    /* endpoint not needed */
 473
 474         urb = usb_alloc_urb(0, GFP_KERNEL);     /* No ISO */
 475         if (urb == NULL) {
 476                 dbg("%s: alloc for endpoint %d failed.", __func__, endpoint);
 477                 return NULL;
 478         }
 479
 480         /* Fill URB using supplied data. */
 481         usb_fill_bulk_urb(urb, serial->dev,
 482                           usb_sndbulkpipe(serial->dev, endpoint) | dir,
 483                           buf, len, callback, ctx);
 484
 485         return urb;
 486 }
 487
 488 /* Setup urbs */
 489 static void usb_wwan_setup_urbs(struct usb_serial *serial)
 490 {
 491         int i, j;
 492         struct usb_serial_port *port;
 493         struct usb_wwan_port_private *portdata;
 494
 495         dbg("%s", __func__);
 496
 497         for (i = 0; i < serial->num_ports; i++) {
 498                 port = serial->port[i];
 499                 portdata = usb_get_serial_port_data(port);
 500
 501                 /* Do indat endpoints first */
 502                 for (j = 0; j < N_IN_URB; ++j) {
 503                         portdata->in_urbs[j] = usb_wwan_setup_urb(serial,
 504                                                                   port->
 505                                                                   bulk_in_endpointAddress,
 506                                                                   USB_DIR_IN,
 507                                                                   port,
 508                                                                   portdata->
 509                                                                   in_buffer[j],
 510                                                                   IN_BUFLEN,
 511                                                                   usb_wwan_indat_callback);
 512                 }
 513
 514                 /* outdat endpoints */
 515                 for (j = 0; j < N_OUT_URB; ++j) {
 516                         portdata->out_urbs[j] = usb_wwan_setup_urb(serial,
 517                                                                    port->
 518                                                                    bulk_out_endpointAddress,
 519                                                                    USB_DIR_OUT,
 520                                                                    port,
 521                                                                    portdata->
 522                                                                    out_buffer
 523                                                                    [j],
 524                                                                    OUT_BUFLEN,
 525                                                                    usb_wwan_outdat_callback);
 526                 }
 527         }
 528 }
 529
 530 int usb_wwan_startup(struct usb_serial *serial)
 531 {
 532         int i, j, err;
 533         struct usb_serial_port *port;
 534         struct usb_wwan_port_private *portdata;
 535         u8 *buffer;
 536
 537         dbg("%s", __func__);
 538
 539         /* Now setup per port private data */
 540         for (i = 0; i < serial->num_ports; i++) {
 541                 port = serial->port[i];
 542                 portdata = kzalloc(sizeof(*portdata), GFP_KERNEL);
 543                 if (!portdata) {
 544                         dbg("%s: kmalloc for usb_wwan_port_private (%d) failed!.",
 545                             __func__, i);
 546                         return 1;
 547                 }
 548                 init_usb_anchor(&portdata->delayed);
 549
 550                 for (j = 0; j < N_IN_URB; j++) {
 551                         buffer = (u8 *) __get_free_page(GFP_KERNEL);
 552                         if (!buffer)
 553                                 goto bail_out_error;
 554                         portdata->in_buffer[j] = buffer;
 555                 }
 556
 557                 for (j = 0; j < N_OUT_URB; j++) {
 558                         buffer = kmalloc(OUT_BUFLEN, GFP_KERNEL);
 559                         if (!buffer)
 560                                 goto bail_out_error2;
 561                         portdata->out_buffer[j] = buffer;
 562                 }
 563
 564                 usb_set_serial_port_data(port, portdata);
 565
 566                 if (!port->interrupt_in_urb)
 567                         continue;
 568                 err = usb_submit_urb(port->interrupt_in_urb, GFP_KERNEL);
 569                 if (err)
 570                         dbg("%s: submit irq_in urb failed %d", __func__, err);
 571         }
 572         usb_wwan_setup_urbs(serial);
 573         return 0;
 574
 575 bail_out_error2:
 576         for (j = 0; j < N_OUT_URB; j++)
 577                 kfree(portdata->out_buffer[j]);
 578 bail_out_error:
 579         for (j = 0; j < N_IN_URB; j++)
 580                 if (portdata->in_buffer[j])
 581                         free_page((unsigned long)portdata->in_buffer[j]);
 582         kfree(portdata);
 583         return 1;
 584 }
 585 EXPORT_SYMBOL(usb_wwan_startup);
 586
 587 static void stop_read_write_urbs(struct usb_serial *serial)
 588 {
 589         int i, j;
 590         struct usb_serial_port *port;
 591         struct usb_wwan_port_private *portdata;
 592
 593         /* Stop reading/writing urbs */
 594         for (i = 0; i < serial->num_ports; ++i) {
 595                 port = serial->port[i];
 596                 portdata = usb_get_serial_port_data(port);
 597                 for (j = 0; j < N_IN_URB; j++)
 598                         usb_kill_urb(portdata->in_urbs[j]);
 599                 for (j = 0; j < N_OUT_URB; j++)
 600                         usb_kill_urb(portdata->out_urbs[j]);
 601         }
 602 }
 603
 604 void usb_wwan_disconnect(struct usb_serial *serial)
 605 {
 606         dbg("%s", __func__);
 607
 608         stop_read_write_urbs(serial);
 609 }
 610 EXPORT_SYMBOL(usb_wwan_disconnect);
 611
 612 void usb_wwan_release(struct usb_serial *serial)
 613 {
 614         int i, j;
 615         struct usb_serial_port *port;
 616         struct usb_wwan_port_private *portdata;
 617
 618         dbg("%s", __func__);
 619
 620         /* Now free them */
 621         for (i = 0; i < serial->num_ports; ++i) {
 622                 port = serial->port[i];
 623                 portdata = usb_get_serial_port_data(port);
 624
 625                 for (j = 0; j < N_IN_URB; j++) {
 626                         usb_free_urb(portdata->in_urbs[j]);
 627                         free_page((unsigned long)
 628                                   portdata->in_buffer[j]);
 629                         portdata->in_urbs[j] = NULL;
 630                 }
 631                 for (j = 0; j < N_OUT_URB; j++) {
 632                         usb_free_urb(portdata->out_urbs[j]);
 633                         kfree(portdata->out_buffer[j]);
 634                         portdata->out_urbs[j] = NULL;
 635                 }
 636         }
 637
 638         /* Now free per port private data */
 639         for (i = 0; i < serial->num_ports; i++) {
 640                 port = serial->port[i];
 641                 kfree(usb_get_serial_port_data(port));
 642         }
 643 }
 644 EXPORT_SYMBOL(usb_wwan_release);
 645
 646 #ifdef CONFIG_PM
 647 int usb_wwan_suspend(struct usb_serial *serial, pm_message_t message)
 648 {
 649         struct usb_wwan_intf_private *intfdata = serial->private;
 650         int b;
 651
 652         dbg("%s entered", __func__);
 653
 654         if (PMSG_IS_AUTO(message)) {
 655                 spin_lock_irq(&intfdata->susp_lock);
 656                 b = intfdata->in_flight;
 657                 spin_unlock_irq(&intfdata->susp_lock);
 658
 659                 if (b)
 660                         return -EBUSY;
 661         }
 662
 663         spin_lock_irq(&intfdata->susp_lock);
 664         intfdata->suspended = 1;
 665         spin_unlock_irq(&intfdata->susp_lock);
 666         stop_read_write_urbs(serial);
 667
 668         return 0;
 669 }
 670 EXPORT_SYMBOL(usb_wwan_suspend);
 671
 672 static void unbusy_queued_urb(struct urb *urb, struct usb_wwan_port_private *portdata)
 673 {
 674         int i;
 675
 676         for (i = 0; i < N_OUT_URB; i++) {
 677                 if (urb == portdata->out_urbs[i]) {
 678                         clear_bit(i, &portdata->out_busy);
 679                         break;
 680                 }
 681         }
 682 }
 683
 684 static void play_delayed(struct usb_serial_port *port)
 685 {
 686         struct usb_wwan_intf_private *data;
 687         struct usb_wwan_port_private *portdata;
 688         struct urb *urb;
 689         int err;
 690
 691         portdata = usb_get_serial_port_data(port);
 692         data = port->serial->private;
 693         while ((urb = usb_get_from_anchor(&portdata->delayed))) {
 694                 err = usb_submit_urb(urb, GFP_ATOMIC);
 695                 if (!err) {
 696                         data->in_flight++;
 697                 } else {
 698                         /* we have to throw away the rest */
 699                         do {
 700                                 unbusy_queued_urb(urb, portdata);
 701                                 usb_autopm_put_interface_no_suspend(port->serial->interface);
 702                         } while ((urb = usb_get_from_anchor(&portdata->delayed)));
 703                         break;
 704                 }
 705         }
 706 }
 707
 708 int usb_wwan_resume(struct usb_serial *serial)
 709 {
 710         int i, j;
 711         struct usb_serial_port *port;
 712         struct usb_wwan_intf_private *intfdata = serial->private;
 713         struct usb_wwan_port_private *portdata;
 714         struct urb *urb;
 715         int err = 0;
 716
 717         dbg("%s entered", __func__);
 718         /* get the interrupt URBs resubmitted unconditionally */
 719         for (i = 0; i < serial->num_ports; i++) {
 720                 port = serial->port[i];
 721                 if (!port->interrupt_in_urb) {
 722                         dbg("%s: No interrupt URB for port %d", __func__, i);
 723                         continue;
 724                 }
 725                 err = usb_submit_urb(port->interrupt_in_urb, GFP_NOIO);
 726                 dbg("Submitted interrupt URB for port %d (result %d)", i, err);
 727                 if (err < 0) {
 728                         err("%s: Error %d for interrupt URB of port%d",
 729                             __func__, err, i);
 730                         goto err_out;
 731                 }
 732         }
 733
 734         for (i = 0; i < serial->num_ports; i++) {
 735                 /* walk all ports */
 736                 port = serial->port[i];
 737                 portdata = usb_get_serial_port_data(port);
 738
 739                 /* skip closed ports */
 740                 spin_lock_irq(&intfdata->susp_lock);
 741                 if (!portdata->opened) {
 742                         spin_unlock_irq(&intfdata->susp_lock);
 743                         continue;
 744                 }
 745
 746                 for (j = 0; j < N_IN_URB; j++) {
 747                         urb = portdata->in_urbs[j];
 748                         err = usb_submit_urb(urb, GFP_ATOMIC);
 749                         if (err < 0) {
 750                                 err("%s: Error %d for bulk URB %d",
 751                                     __func__, err, i);
 752                                 spin_unlock_irq(&intfdata->susp_lock);
 753                                 goto err_out;
 754                         }
 755                 }
 756                 play_delayed(port);
 757                 spin_unlock_irq(&intfdata->susp_lock);
 758         }
 759         spin_lock_irq(&intfdata->susp_lock);
 760         intfdata->suspended = 0;
 761         spin_unlock_irq(&intfdata->susp_lock);
 762 err_out:
 763         return err;
 764 }
 765 EXPORT_SYMBOL(usb_wwan_resume);
 766 #endif
 767
 768 MODULE_AUTHOR(DRIVER_AUTHOR);
 769 MODULE_DESCRIPTION(DRIVER_DESC);
 770 MODULE_VERSION(DRIVER_VERSION);
 771 MODULE_LICENSE("GPL");
 772
 773 module_param(debug, bool, S_IRUGO | S_IWUSR);
 774 MODULE_PARM_DESC(debug, "Debug messages");