SAFE public projects git trees. - safe/jmp/linux-2.6/blob - drivers/usb/serial/usb-serial.c

   1 /*
   2  * USB Serial Converter driver
   3  *
   4  * Copyright (C) 1999 - 2005 Greg Kroah-Hartman (greg@kroah.com)
   5  * Copyright (C) 2000 Peter Berger (pberger@brimson.com)
   6  * Copyright (C) 2000 Al Borchers (borchers@steinerpoint.com)
   7  *
   8  *      This program is free software; you can redistribute it and/or
   9  *      modify it under the terms of the GNU General Public License version
  10  *      2 as published by the Free Software Foundation.
  11  *
  12  * This driver was originally based on the ACM driver by Armin Fuerst (which was
  13  * based on a driver by Brad Keryan)
  14  *
  15  * See Documentation/usb/usb-serial.txt for more information on using this
  16  * driver
  17  *
  18  */
  19
  20 #include <linux/kernel.h>
  21 #include <linux/errno.h>
  22 #include <linux/init.h>
  23 #include <linux/slab.h>
  24 #include <linux/smp_lock.h>
  25 #include <linux/tty.h>
  26 #include <linux/tty_driver.h>
  27 #include <linux/tty_flip.h>
  28 #include <linux/module.h>
  29 #include <linux/moduleparam.h>
  30 #include <linux/seq_file.h>
  31 #include <linux/spinlock.h>
  32 #include <linux/mutex.h>
  33 #include <linux/list.h>
  34 #include <linux/uaccess.h>
  35 #include <linux/serial.h>
  36 #include <linux/usb.h>
  37 #include <linux/usb/serial.h>
  38 #include <linux/kfifo.h>
  39 #include "pl2303.h"
  40
  41 /*
  42  * Version Information
  43  */
  44 #define DRIVER_AUTHOR "Greg Kroah-Hartman, greg@kroah.com, http://www.kroah.com/linux/"
  45 #define DRIVER_DESC "USB Serial Driver core"
  46
  47 /* Driver structure we register with the USB core */
  48 static struct usb_driver usb_serial_driver = {
  49         .name =         "usbserial",
  50         .probe =        usb_serial_probe,
  51         .disconnect =   usb_serial_disconnect,
  52         .suspend =      usb_serial_suspend,
  53         .resume =       usb_serial_resume,
  54         .no_dynamic_id =        1,
  55 };
  56
  57 /* There is no MODULE_DEVICE_TABLE for usbserial.c.  Instead
  58    the MODULE_DEVICE_TABLE declarations in each serial driver
  59    cause the "hotplug" program to pull in whatever module is necessary
  60    via modprobe, and modprobe will load usbserial because the serial
  61    drivers depend on it.
  62 */
  63
  64 static int debug;
  65 /* initially all NULL */
  66 static struct usb_serial *serial_table[SERIAL_TTY_MINORS];
  67 static DEFINE_MUTEX(table_lock);
  68 static LIST_HEAD(usb_serial_driver_list);
  69
  70 /*
  71  * Look up the serial structure.  If it is found and it hasn't been
  72  * disconnected, return with its disc_mutex held and its refcount
  73  * incremented.  Otherwise return NULL.
  74  */
  75 struct usb_serial *usb_serial_get_by_index(unsigned index)
  76 {
  77         struct usb_serial *serial;
  78
  79         mutex_lock(&table_lock);
  80         serial = serial_table[index];
  81
  82         if (serial) {
  83                 mutex_lock(&serial->disc_mutex);
  84                 if (serial->disconnected) {
  85                         mutex_unlock(&serial->disc_mutex);
  86                         serial = NULL;
  87                 } else {
  88                         kref_get(&serial->kref);
  89                 }
  90         }
  91         mutex_unlock(&table_lock);
  92         return serial;
  93 }
  94
  95 static struct usb_serial *get_free_serial(struct usb_serial *serial,
  96                                         int num_ports, unsigned int *minor)
  97 {
  98         unsigned int i, j;
  99         int good_spot;
 100
 101         dbg("%s %d", __func__, num_ports);
 102
 103         *minor = 0;
 104         mutex_lock(&table_lock);
 105         for (i = 0; i < SERIAL_TTY_MINORS; ++i) {
 106                 if (serial_table[i])
 107                         continue;
 108
 109                 good_spot = 1;
 110                 for (j = 1; j <= num_ports-1; ++j)
 111                         if ((i+j >= SERIAL_TTY_MINORS) || (serial_table[i+j])) {
 112                                 good_spot = 0;
 113                                 i += j;
 114                                 break;
 115                         }
 116                 if (good_spot == 0)
 117                         continue;
 118
 119                 *minor = i;
 120                 j = 0;
 121                 dbg("%s - minor base = %d", __func__, *minor);
 122                 for (i = *minor; (i < (*minor + num_ports)) && (i < SERIAL_TTY_MINORS); ++i) {
 123                         serial_table[i] = serial;
 124                         serial->port[j++]->number = i;
 125                 }
 126                 mutex_unlock(&table_lock);
 127                 return serial;
 128         }
 129         mutex_unlock(&table_lock);
 130         return NULL;
 131 }
 132
 133 static void return_serial(struct usb_serial *serial)
 134 {
 135         int i;
 136
 137         dbg("%s", __func__);
 138
 139         mutex_lock(&table_lock);
 140         for (i = 0; i < serial->num_ports; ++i)
 141                 serial_table[serial->minor + i] = NULL;
 142         mutex_unlock(&table_lock);
 143 }
 144
 145 static void destroy_serial(struct kref *kref)
 146 {
 147         struct usb_serial *serial;
 148         struct usb_serial_port *port;
 149         int i;
 150
 151         serial = to_usb_serial(kref);
 152
 153         dbg("%s - %s", __func__, serial->type->description);
 154
 155         /* return the minor range that this device had */
 156         if (serial->minor != SERIAL_TTY_NO_MINOR)
 157                 return_serial(serial);
 158
 159         if (serial->attached)
 160                 serial->type->release(serial);
 161
 162         /* Now that nothing is using the ports, they can be freed */
 163         for (i = 0; i < serial->num_port_pointers; ++i) {
 164                 port = serial->port[i];
 165                 if (port) {
 166                         port->serial = NULL;
 167                         put_device(&port->dev);
 168                 }
 169         }
 170
 171         usb_put_dev(serial->dev);
 172         kfree(serial);
 173 }
 174
 175 void usb_serial_put(struct usb_serial *serial)
 176 {
 177         kref_put(&serial->kref, destroy_serial);
 178 }
 179
 180 /*****************************************************************************
 181  * Driver tty interface functions
 182  *****************************************************************************/
 183
 184 /**
 185  * serial_install - install tty
 186  * @driver: the driver (USB in our case)
 187  * @tty: the tty being created
 188  *
 189  * Create the termios objects for this tty.  We use the default
 190  * USB serial settings but permit them to be overridden by
 191  * serial->type->init_termios.
 192  *
 193  * This is the first place a new tty gets used.  Hence this is where we
 194  * acquire references to the usb_serial structure and the driver module,
 195  * where we store a pointer to the port, and where we do an autoresume.
 196  * All these actions are reversed in serial_cleanup().
 197  */
 198 static int serial_install(struct tty_driver *driver, struct tty_struct *tty)
 199 {
 200         int idx = tty->index;
 201         struct usb_serial *serial;
 202         struct usb_serial_port *port;
 203         int retval = -ENODEV;
 204
 205         dbg("%s", __func__);
 206
 207         serial = usb_serial_get_by_index(idx);
 208         if (!serial)
 209                 return retval;
 210
 211         port = serial->port[idx - serial->minor];
 212         if (!port)
 213                 goto error_no_port;
 214         if (!try_module_get(serial->type->driver.owner))
 215                 goto error_module_get;
 216
 217         /* perform the standard setup */
 218         retval = tty_init_termios(tty);
 219         if (retval)
 220                 goto error_init_termios;
 221
 222         retval = usb_autopm_get_interface(serial->interface);
 223         if (retval)
 224                 goto error_get_interface;
 225
 226         mutex_unlock(&serial->disc_mutex);
 227
 228         /* allow the driver to update the settings */
 229         if (serial->type->init_termios)
 230                 serial->type->init_termios(tty);
 231
 232         tty->driver_data = port;
 233
 234         /* Final install (we use the default method) */
 235         tty_driver_kref_get(driver);
 236         tty->count++;
 237         driver->ttys[idx] = tty;
 238         return retval;
 239
 240  error_get_interface:
 241  error_init_termios:
 242         module_put(serial->type->driver.owner);
 243  error_module_get:
 244  error_no_port:
 245         usb_serial_put(serial);
 246         mutex_unlock(&serial->disc_mutex);
 247         return retval;
 248 }
 249
 250 static int serial_activate(struct tty_port *tport, struct tty_struct *tty)
 251 {
 252         struct usb_serial_port *port =
 253                 container_of(tport, struct usb_serial_port, port);
 254         struct usb_serial *serial = port->serial;
 255         int retval;
 256
 257         mutex_lock(&serial->disc_mutex);
 258         if (serial->disconnected)
 259                 retval = -ENODEV;
 260         else
 261                 retval = port->serial->type->open(tty, port);
 262         mutex_unlock(&serial->disc_mutex);
 263         return retval;
 264 }
 265
 266 static int serial_open(struct tty_struct *tty, struct file *filp)
 267 {
 268         struct usb_serial_port *port = tty->driver_data;
 269
 270         dbg("%s - port %d", __func__, port->number);
 271         return tty_port_open(&port->port, tty, filp);
 272 }
 273
 274 /**
 275  * serial_down - shut down hardware
 276  * @tport: tty port to shut down
 277  *
 278  * Shut down a USB serial port unless it is the console.  We never
 279  * shut down the console hardware as it will always be in use. Serialized
 280  * against activate by the tport mutex and kept to matching open/close pairs
 281  * of calls by the ASYNCB_INITIALIZED flag.
 282  */
 283 static void serial_down(struct tty_port *tport)
 284 {
 285         struct usb_serial_port *port =
 286                 container_of(tport, struct usb_serial_port, port);
 287         struct usb_serial_driver *drv = port->serial->type;
 288         /*
 289          * The console is magical.  Do not hang up the console hardware
 290          * or there will be tears.
 291          */
 292         if (port->console)
 293                 return;
 294         if (drv->close)
 295                 drv->close(port);
 296 }
 297
 298 static void serial_hangup(struct tty_struct *tty)
 299 {
 300         struct usb_serial_port *port = tty->driver_data;
 301         dbg("%s - port %d", __func__, port->number);
 302         tty_port_hangup(&port->port);
 303 }
 304
 305 static void serial_close(struct tty_struct *tty, struct file *filp)
 306 {
 307         struct usb_serial_port *port = tty->driver_data;
 308         dbg("%s - port %d", __func__, port->number);
 309         tty_port_close(&port->port, tty, filp);
 310 }
 311
 312 /**
 313  * serial_cleanup - free resources post close/hangup
 314  * @port: port to free up
 315  *
 316  * Do the resource freeing and refcount dropping for the port.
 317  * Avoid freeing the console.
 318  *
 319  * Called asynchronously after the last tty kref is dropped,
 320  * and the tty layer has already done the tty_shutdown(tty);
 321  */
 322 static void serial_cleanup(struct tty_struct *tty)
 323 {
 324         struct usb_serial_port *port = tty->driver_data;
 325         struct usb_serial *serial;
 326         struct module *owner;
 327
 328         /* The console is magical.  Do not hang up the console hardware
 329          * or there will be tears.
 330          */
 331         if (port->console)
 332                 return;
 333
 334         dbg("%s - port %d", __func__, port->number);
 335
 336         tty->driver_data = NULL;
 337
 338         serial = port->serial;
 339         owner = serial->type->driver.owner;
 340
 341         mutex_lock(&serial->disc_mutex);
 342         if (!serial->disconnected)
 343                 usb_autopm_put_interface(serial->interface);
 344         mutex_unlock(&serial->disc_mutex);
 345
 346         usb_serial_put(serial);
 347         module_put(owner);
 348 }
 349
 350 static int serial_write(struct tty_struct *tty, const unsigned char *buf,
 351                                                                 int count)
 352 {
 353         struct usb_serial_port *port = tty->driver_data;
 354         int retval = -ENODEV;
 355
 356         if (port->serial->dev->state == USB_STATE_NOTATTACHED)
 357                 goto exit;
 358
 359         dbg("%s - port %d, %d byte(s)", __func__, port->number, count);
 360
 361         /* count is managed under the mutex lock for the tty so cannot
 362            drop to zero until after the last close completes */
 363         WARN_ON(!port->port.count);
 364
 365         /* pass on to the driver specific version of this function */
 366         retval = port->serial->type->write(tty, port, buf, count);
 367
 368 exit:
 369         return retval;
 370 }
 371
 372 static int serial_write_room(struct tty_struct *tty)
 373 {
 374         struct usb_serial_port *port = tty->driver_data;
 375         dbg("%s - port %d", __func__, port->number);
 376         WARN_ON(!port->port.count);
 377         /* pass on to the driver specific version of this function */
 378         return port->serial->type->write_room(tty);
 379 }
 380
 381 static int serial_chars_in_buffer(struct tty_struct *tty)
 382 {
 383         struct usb_serial_port *port = tty->driver_data;
 384         dbg("%s = port %d", __func__, port->number);
 385
 386         /* if the device was unplugged then any remaining characters
 387            fell out of the connector ;) */
 388         if (port->serial->disconnected)
 389                 return 0;
 390         /* pass on to the driver specific version of this function */
 391         return port->serial->type->chars_in_buffer(tty);
 392 }
 393
 394 static void serial_throttle(struct tty_struct *tty)
 395 {
 396         struct usb_serial_port *port = tty->driver_data;
 397         dbg("%s - port %d", __func__, port->number);
 398
 399         WARN_ON(!port->port.count);
 400         /* pass on to the driver specific version of this function */
 401         if (port->serial->type->throttle)
 402                 port->serial->type->throttle(tty);
 403 }
 404
 405 static void serial_unthrottle(struct tty_struct *tty)
 406 {
 407         struct usb_serial_port *port = tty->driver_data;
 408         dbg("%s - port %d", __func__, port->number);
 409
 410         WARN_ON(!port->port.count);
 411         /* pass on to the driver specific version of this function */
 412         if (port->serial->type->unthrottle)
 413                 port->serial->type->unthrottle(tty);
 414 }
 415
 416 static int serial_ioctl(struct tty_struct *tty, struct file *file,
 417                                         unsigned int cmd, unsigned long arg)
 418 {
 419         struct usb_serial_port *port = tty->driver_data;
 420         int retval = -ENODEV;
 421
 422         dbg("%s - port %d, cmd 0x%.4x", __func__, port->number, cmd);
 423
 424         WARN_ON(!port->port.count);
 425
 426         /* pass on to the driver specific version of this function
 427            if it is available */
 428         if (port->serial->type->ioctl) {
 429                 retval = port->serial->type->ioctl(tty, file, cmd, arg);
 430         } else
 431                 retval = -ENOIOCTLCMD;
 432         return retval;
 433 }
 434
 435 static void serial_set_termios(struct tty_struct *tty, struct ktermios *old)
 436 {
 437         struct usb_serial_port *port = tty->driver_data;
 438         dbg("%s - port %d", __func__, port->number);
 439
 440         WARN_ON(!port->port.count);
 441         /* pass on to the driver specific version of this function
 442            if it is available */
 443         if (port->serial->type->set_termios)
 444                 port->serial->type->set_termios(tty, port, old);
 445         else
 446                 tty_termios_copy_hw(tty->termios, old);
 447 }
 448
 449 static int serial_break(struct tty_struct *tty, int break_state)
 450 {
 451         struct usb_serial_port *port = tty->driver_data;
 452
 453         dbg("%s - port %d", __func__, port->number);
 454
 455         WARN_ON(!port->port.count);
 456         /* pass on to the driver specific version of this function
 457            if it is available */
 458         if (port->serial->type->break_ctl)
 459                 port->serial->type->break_ctl(tty, break_state);
 460         return 0;
 461 }
 462
 463 static int serial_proc_show(struct seq_file *m, void *v)
 464 {
 465         struct usb_serial *serial;
 466         int i;
 467         char tmp[40];
 468
 469         dbg("%s", __func__);
 470         seq_puts(m, "usbserinfo:1.0 driver:2.0\n");
 471         for (i = 0; i < SERIAL_TTY_MINORS; ++i) {
 472                 serial = usb_serial_get_by_index(i);
 473                 if (serial == NULL)
 474                         continue;
 475
 476                 seq_printf(m, "%d:", i);
 477                 if (serial->type->driver.owner)
 478                         seq_printf(m, " module:%s",
 479                                 module_name(serial->type->driver.owner));
 480                 seq_printf(m, " name:\"%s\"",
 481                                 serial->type->description);
 482                 seq_printf(m, " vendor:%04x product:%04x",
 483                         le16_to_cpu(serial->dev->descriptor.idVendor),
 484                         le16_to_cpu(serial->dev->descriptor.idProduct));
 485                 seq_printf(m, " num_ports:%d", serial->num_ports);
 486                 seq_printf(m, " port:%d", i - serial->minor + 1);
 487                 usb_make_path(serial->dev, tmp, sizeof(tmp));
 488                 seq_printf(m, " path:%s", tmp);
 489
 490                 seq_putc(m, '\n');
 491                 usb_serial_put(serial);
 492                 mutex_unlock(&serial->disc_mutex);
 493         }
 494         return 0;
 495 }
 496
 497 static int serial_proc_open(struct inode *inode, struct file *file)
 498 {
 499         return single_open(file, serial_proc_show, NULL);
 500 }
 501
 502 static const struct file_operations serial_proc_fops = {
 503         .owner          = THIS_MODULE,
 504         .open           = serial_proc_open,
 505         .read           = seq_read,
 506         .llseek         = seq_lseek,
 507         .release        = single_release,
 508 };
 509
 510 static int serial_tiocmget(struct tty_struct *tty, struct file *file)
 511 {
 512         struct usb_serial_port *port = tty->driver_data;
 513
 514         dbg("%s - port %d", __func__, port->number);
 515
 516         WARN_ON(!port->port.count);
 517         if (port->serial->type->tiocmget)
 518                 return port->serial->type->tiocmget(tty, file);
 519         return -EINVAL;
 520 }
 521
 522 static int serial_tiocmset(struct tty_struct *tty, struct file *file,
 523                             unsigned int set, unsigned int clear)
 524 {
 525         struct usb_serial_port *port = tty->driver_data;
 526
 527         dbg("%s - port %d", __func__, port->number);
 528
 529         WARN_ON(!port->port.count);
 530         if (port->serial->type->tiocmset)
 531                 return port->serial->type->tiocmset(tty, file, set, clear);
 532         return -EINVAL;
 533 }
 534
 535 /*
 536  * We would be calling tty_wakeup here, but unfortunately some line
 537  * disciplines have an annoying habit of calling tty->write from
 538  * the write wakeup callback (e.g. n_hdlc.c).
 539  */
 540 void usb_serial_port_softint(struct usb_serial_port *port)
 541 {
 542         schedule_work(&port->work);
 543 }
 544 EXPORT_SYMBOL_GPL(usb_serial_port_softint);
 545
 546 static void usb_serial_port_work(struct work_struct *work)
 547 {
 548         struct usb_serial_port *port =
 549                 container_of(work, struct usb_serial_port, work);
 550         struct tty_struct *tty;
 551
 552         dbg("%s - port %d", __func__, port->number);
 553
 554         tty = tty_port_tty_get(&port->port);
 555         if (!tty)
 556                 return;
 557
 558         tty_wakeup(tty);
 559         tty_kref_put(tty);
 560 }
 561
 562 static void kill_traffic(struct usb_serial_port *port)
 563 {
 564         usb_kill_urb(port->read_urb);
 565         usb_kill_urb(port->write_urb);
 566         /*
 567          * This is tricky.
 568          * Some drivers submit the read_urb in the
 569          * handler for the write_urb or vice versa
 570          * this order determines the order in which
 571          * usb_kill_urb() must be used to reliably
 572          * kill the URBs. As it is unknown here,
 573          * both orders must be used in turn.
 574          * The call below is not redundant.
 575          */
 576         usb_kill_urb(port->read_urb);
 577         usb_kill_urb(port->interrupt_in_urb);
 578         usb_kill_urb(port->interrupt_out_urb);
 579 }
 580
 581 static void port_release(struct device *dev)
 582 {
 583         struct usb_serial_port *port = to_usb_serial_port(dev);
 584
 585         dbg ("%s - %s", __func__, dev_name(dev));
 586
 587         /*
 588          * Stop all the traffic before cancelling the work, so that
 589          * nobody will restart it by calling usb_serial_port_softint.
 590          */
 591         kill_traffic(port);
 592         cancel_work_sync(&port->work);
 593
 594         usb_free_urb(port->read_urb);
 595         usb_free_urb(port->write_urb);
 596         usb_free_urb(port->interrupt_in_urb);
 597         usb_free_urb(port->interrupt_out_urb);
 598         if (!IS_ERR(port->write_fifo) && port->write_fifo)
 599                 kfifo_free(port->write_fifo);
 600         kfree(port->bulk_in_buffer);
 601         kfree(port->bulk_out_buffer);
 602         kfree(port->interrupt_in_buffer);
 603         kfree(port->interrupt_out_buffer);
 604         kfree(port);
 605 }
 606
 607 static struct usb_serial *create_serial(struct usb_device *dev,
 608                                         struct usb_interface *interface,
 609                                         struct usb_serial_driver *driver)
 610 {
 611         struct usb_serial *serial;
 612
 613         serial = kzalloc(sizeof(*serial), GFP_KERNEL);
 614         if (!serial) {
 615                 dev_err(&dev->dev, "%s - out of memory\n", __func__);
 616                 return NULL;
 617         }
 618         serial->dev = usb_get_dev(dev);
 619         serial->type = driver;
 620         serial->interface = interface;
 621         kref_init(&serial->kref);
 622         mutex_init(&serial->disc_mutex);
 623         serial->minor = SERIAL_TTY_NO_MINOR;
 624
 625         return serial;
 626 }
 627
 628 static const struct usb_device_id *match_dynamic_id(struct usb_interface *intf,
 629                                             struct usb_serial_driver *drv)
 630 {
 631         struct usb_dynid *dynid;
 632
 633         spin_lock(&drv->dynids.lock);
 634         list_for_each_entry(dynid, &drv->dynids.list, node) {
 635                 if (usb_match_one_id(intf, &dynid->id)) {
 636                         spin_unlock(&drv->dynids.lock);
 637                         return &dynid->id;
 638                 }
 639         }
 640         spin_unlock(&drv->dynids.lock);
 641         return NULL;
 642 }
 643
 644 static const struct usb_device_id *get_iface_id(struct usb_serial_driver *drv,
 645                                                 struct usb_interface *intf)
 646 {
 647         const struct usb_device_id *id;
 648
 649         id = usb_match_id(intf, drv->id_table);
 650         if (id) {
 651                 dbg("static descriptor matches");
 652                 goto exit;
 653         }
 654         id = match_dynamic_id(intf, drv);
 655         if (id)
 656                 dbg("dynamic descriptor matches");
 657 exit:
 658         return id;
 659 }
 660
 661 static struct usb_serial_driver *search_serial_device(
 662                                         struct usb_interface *iface)
 663 {
 664         const struct usb_device_id *id;
 665         struct usb_serial_driver *drv;
 666
 667         /* Check if the usb id matches a known device */
 668         list_for_each_entry(drv, &usb_serial_driver_list, driver_list) {
 669                 id = get_iface_id(drv, iface);
 670                 if (id)
 671                         return drv;
 672         }
 673
 674         return NULL;
 675 }
 676
 677 static int serial_carrier_raised(struct tty_port *port)
 678 {
 679         struct usb_serial_port *p = container_of(port, struct usb_serial_port, port);
 680         struct usb_serial_driver *drv = p->serial->type;
 681         if (drv->carrier_raised)
 682                 return drv->carrier_raised(p);
 683         /* No carrier control - don't block */
 684         return 1;
 685 }
 686
 687 static void serial_dtr_rts(struct tty_port *port, int on)
 688 {
 689         struct usb_serial_port *p = container_of(port, struct usb_serial_port, port);
 690         struct usb_serial_driver *drv = p->serial->type;
 691         if (drv->dtr_rts)
 692                 drv->dtr_rts(p, on);
 693 }
 694
 695 static const struct tty_port_operations serial_port_ops = {
 696         .carrier_raised = serial_carrier_raised,
 697         .dtr_rts = serial_dtr_rts,
 698         .activate = serial_activate,
 699         .shutdown = serial_down,
 700 };
 701
 702 int usb_serial_probe(struct usb_interface *interface,
 703                                const struct usb_device_id *id)
 704 {
 705         struct usb_device *dev = interface_to_usbdev(interface);
 706         struct usb_serial *serial = NULL;
 707         struct usb_serial_port *port;
 708         struct usb_host_interface *iface_desc;
 709         struct usb_endpoint_descriptor *endpoint;
 710         struct usb_endpoint_descriptor *interrupt_in_endpoint[MAX_NUM_PORTS];
 711         struct usb_endpoint_descriptor *interrupt_out_endpoint[MAX_NUM_PORTS];
 712         struct usb_endpoint_descriptor *bulk_in_endpoint[MAX_NUM_PORTS];
 713         struct usb_endpoint_descriptor *bulk_out_endpoint[MAX_NUM_PORTS];
 714         struct usb_serial_driver *type = NULL;
 715         int retval;
 716         unsigned int minor;
 717         int buffer_size;
 718         int i;
 719         int num_interrupt_in = 0;
 720         int num_interrupt_out = 0;
 721         int num_bulk_in = 0;
 722         int num_bulk_out = 0;
 723         int num_ports = 0;
 724         int max_endpoints;
 725
 726         lock_kernel(); /* guard against unloading a serial driver module */
 727         type = search_serial_device(interface);
 728         if (!type) {
 729                 unlock_kernel();
 730                 dbg("none matched");
 731                 return -ENODEV;
 732         }
 733
 734         serial = create_serial(dev, interface, type);
 735         if (!serial) {
 736                 unlock_kernel();
 737                 dev_err(&interface->dev, "%s - out of memory\n", __func__);
 738                 return -ENOMEM;
 739         }
 740
 741         /* if this device type has a probe function, call it */
 742         if (type->probe) {
 743                 const struct usb_device_id *id;
 744
 745                 if (!try_module_get(type->driver.owner)) {
 746                         unlock_kernel();
 747                         dev_err(&interface->dev,
 748                                 "module get failed, exiting\n");
 749                         kfree(serial);
 750                         return -EIO;
 751                 }
 752
 753                 id = get_iface_id(type, interface);
 754                 retval = type->probe(serial, id);
 755                 module_put(type->driver.owner);
 756
 757                 if (retval) {
 758                         unlock_kernel();
 759                         dbg("sub driver rejected device");
 760                         kfree(serial);
 761                         return retval;
 762                 }
 763         }
 764
 765         /* descriptor matches, let's find the endpoints needed */
 766         /* check out the endpoints */
 767         iface_desc = interface->cur_altsetting;
 768         for (i = 0; i < iface_desc->desc.bNumEndpoints; ++i) {
 769                 endpoint = &iface_desc->endpoint[i].desc;
 770
 771                 if (usb_endpoint_is_bulk_in(endpoint)) {
 772                         /* we found a bulk in endpoint */
 773                         dbg("found bulk in on endpoint %d", i);
 774                         bulk_in_endpoint[num_bulk_in] = endpoint;
 775                         ++num_bulk_in;
 776                 }
 777
 778                 if (usb_endpoint_is_bulk_out(endpoint)) {
 779                         /* we found a bulk out endpoint */
 780                         dbg("found bulk out on endpoint %d", i);
 781                         bulk_out_endpoint[num_bulk_out] = endpoint;
 782                         ++num_bulk_out;
 783                 }
 784
 785                 if (usb_endpoint_is_int_in(endpoint)) {
 786                         /* we found a interrupt in endpoint */
 787                         dbg("found interrupt in on endpoint %d", i);
 788                         interrupt_in_endpoint[num_interrupt_in] = endpoint;
 789                         ++num_interrupt_in;
 790                 }
 791
 792                 if (usb_endpoint_is_int_out(endpoint)) {
 793                         /* we found an interrupt out endpoint */
 794                         dbg("found interrupt out on endpoint %d", i);
 795                         interrupt_out_endpoint[num_interrupt_out] = endpoint;
 796                         ++num_interrupt_out;
 797                 }
 798         }
 799
 800 #if defined(CONFIG_USB_SERIAL_PL2303) || defined(CONFIG_USB_SERIAL_PL2303_MODULE)
 801         /* BEGIN HORRIBLE HACK FOR PL2303 */
 802         /* this is needed due to the looney way its endpoints are set up */
 803         if (((le16_to_cpu(dev->descriptor.idVendor) == PL2303_VENDOR_ID) &&
 804              (le16_to_cpu(dev->descriptor.idProduct) == PL2303_PRODUCT_ID)) ||
 805             ((le16_to_cpu(dev->descriptor.idVendor) == ATEN_VENDOR_ID) &&
 806              (le16_to_cpu(dev->descriptor.idProduct) == ATEN_PRODUCT_ID)) ||
 807             ((le16_to_cpu(dev->descriptor.idVendor) == ALCOR_VENDOR_ID) &&
 808              (le16_to_cpu(dev->descriptor.idProduct) == ALCOR_PRODUCT_ID)) ||
 809             ((le16_to_cpu(dev->descriptor.idVendor) == SIEMENS_VENDOR_ID) &&
 810              (le16_to_cpu(dev->descriptor.idProduct) == SIEMENS_PRODUCT_ID_EF81))) {
 811                 if (interface != dev->actconfig->interface[0]) {
 812                         /* check out the endpoints of the other interface*/
 813                         iface_desc = dev->actconfig->interface[0]->cur_altsetting;
 814                         for (i = 0; i < iface_desc->desc.bNumEndpoints; ++i) {
 815                                 endpoint = &iface_desc->endpoint[i].desc;
 816                                 if (usb_endpoint_is_int_in(endpoint)) {
 817                                         /* we found a interrupt in endpoint */
 818                                         dbg("found interrupt in for Prolific device on separate interface");
 819                                         interrupt_in_endpoint[num_interrupt_in] = endpoint;
 820                                         ++num_interrupt_in;
 821                                 }
 822                         }
 823                 }
 824
 825                 /* Now make sure the PL-2303 is configured correctly.
 826                  * If not, give up now and hope this hack will work
 827                  * properly during a later invocation of usb_serial_probe
 828                  */
 829                 if (num_bulk_in == 0 || num_bulk_out == 0) {
 830                         unlock_kernel();
 831                         dev_info(&interface->dev, "PL-2303 hack: descriptors matched but endpoints did not\n");
 832                         kfree(serial);
 833                         return -ENODEV;
 834                 }
 835         }
 836         /* END HORRIBLE HACK FOR PL2303 */
 837 #endif
 838
 839 #ifdef CONFIG_USB_SERIAL_GENERIC
 840         if (type == &usb_serial_generic_device) {
 841                 num_ports = num_bulk_out;
 842                 if (num_ports == 0) {
 843                         unlock_kernel();
 844                         dev_err(&interface->dev,
 845                             "Generic device with no bulk out, not allowed.\n");
 846                         kfree(serial);
 847                         return -EIO;
 848                 }
 849         }
 850 #endif
 851         if (!num_ports) {
 852                 /* if this device type has a calc_num_ports function, call it */
 853                 if (type->calc_num_ports) {
 854                         if (!try_module_get(type->driver.owner)) {
 855                                 unlock_kernel();
 856                                 dev_err(&interface->dev,
 857                                         "module get failed, exiting\n");
 858                                 kfree(serial);
 859                                 return -EIO;
 860                         }
 861                         num_ports = type->calc_num_ports(serial);
 862                         module_put(type->driver.owner);
 863                 }
 864                 if (!num_ports)
 865                         num_ports = type->num_ports;
 866         }
 867
 868         serial->num_ports = num_ports;
 869         serial->num_bulk_in = num_bulk_in;
 870         serial->num_bulk_out = num_bulk_out;
 871         serial->num_interrupt_in = num_interrupt_in;
 872         serial->num_interrupt_out = num_interrupt_out;
 873
 874         /* found all that we need */
 875         dev_info(&interface->dev, "%s converter detected\n",
 876                         type->description);
 877
 878         /* create our ports, we need as many as the max endpoints */
 879         /* we don't use num_ports here because some devices have more
 880            endpoint pairs than ports */
 881         max_endpoints = max(num_bulk_in, num_bulk_out);
 882         max_endpoints = max(max_endpoints, num_interrupt_in);
 883         max_endpoints = max(max_endpoints, num_interrupt_out);
 884         max_endpoints = max(max_endpoints, (int)serial->num_ports);
 885         serial->num_port_pointers = max_endpoints;
 886         unlock_kernel();
 887
 888         dbg("%s - setting up %d port structures for this device",
 889                                                 __func__, max_endpoints);
 890         for (i = 0; i < max_endpoints; ++i) {
 891                 port = kzalloc(sizeof(struct usb_serial_port), GFP_KERNEL);
 892                 if (!port)
 893                         goto probe_error;
 894                 tty_port_init(&port->port);
 895                 port->port.ops = &serial_port_ops;
 896                 port->serial = serial;
 897                 spin_lock_init(&port->lock);
 898                 /* Keep this for private driver use for the moment but
 899                    should probably go away */
 900                 INIT_WORK(&port->work, usb_serial_port_work);
 901                 serial->port[i] = port;
 902                 port->dev.parent = &interface->dev;
 903                 port->dev.driver = NULL;
 904                 port->dev.bus = &usb_serial_bus_type;
 905                 port->dev.release = &port_release;
 906                 device_initialize(&port->dev);
 907         }
 908
 909         /* set up the endpoint information */
 910         for (i = 0; i < num_bulk_in; ++i) {
 911                 endpoint = bulk_in_endpoint[i];
 912                 port = serial->port[i];
 913                 port->read_urb = usb_alloc_urb(0, GFP_KERNEL);
 914                 if (!port->read_urb) {
 915                         dev_err(&interface->dev, "No free urbs available\n");
 916                         goto probe_error;
 917                 }
 918                 buffer_size = le16_to_cpu(endpoint->wMaxPacketSize);
 919                 port->bulk_in_size = buffer_size;
 920                 port->bulk_in_endpointAddress = endpoint->bEndpointAddress;
 921                 port->bulk_in_buffer = kmalloc(buffer_size, GFP_KERNEL);
 922                 if (!port->bulk_in_buffer) {
 923                         dev_err(&interface->dev,
 924                                         "Couldn't allocate bulk_in_buffer\n");
 925                         goto probe_error;
 926                 }
 927                 usb_fill_bulk_urb(port->read_urb, dev,
 928                                 usb_rcvbulkpipe(dev,
 929                                                 endpoint->bEndpointAddress),
 930                                 port->bulk_in_buffer, buffer_size,
 931                                 serial->type->read_bulk_callback, port);
 932         }
 933
 934         for (i = 0; i < num_bulk_out; ++i) {
 935                 endpoint = bulk_out_endpoint[i];
 936                 port = serial->port[i];
 937                 port->write_urb = usb_alloc_urb(0, GFP_KERNEL);
 938                 if (!port->write_urb) {
 939                         dev_err(&interface->dev, "No free urbs available\n");
 940                         goto probe_error;
 941                 }
 942                 if (kfifo_alloc(&port->write_fifo, PAGE_SIZE, GFP_KERNEL,
 943                         &port->lock))
 944                         goto probe_error;
 945                 buffer_size = le16_to_cpu(endpoint->wMaxPacketSize);
 946                 port->bulk_out_size = buffer_size;
 947                 port->bulk_out_endpointAddress = endpoint->bEndpointAddress;
 948                 port->bulk_out_buffer = kmalloc(buffer_size, GFP_KERNEL);
 949                 if (!port->bulk_out_buffer) {
 950                         dev_err(&interface->dev,
 951                                         "Couldn't allocate bulk_out_buffer\n");
 952                         goto probe_error;
 953                 }
 954                 usb_fill_bulk_urb(port->write_urb, dev,
 955                                 usb_sndbulkpipe(dev,
 956                                         endpoint->bEndpointAddress),
 957                                 port->bulk_out_buffer, buffer_size,
 958                                 serial->type->write_bulk_callback, port);
 959         }
 960
 961         if (serial->type->read_int_callback) {
 962                 for (i = 0; i < num_interrupt_in; ++i) {
 963                         endpoint = interrupt_in_endpoint[i];
 964                         port = serial->port[i];
 965                         port->interrupt_in_urb = usb_alloc_urb(0, GFP_KERNEL);
 966                         if (!port->interrupt_in_urb) {
 967                                 dev_err(&interface->dev,
 968                                                 "No free urbs available\n");
 969                                 goto probe_error;
 970                         }
 971                         buffer_size = le16_to_cpu(endpoint->wMaxPacketSize);
 972                         port->interrupt_in_endpointAddress =
 973                                                 endpoint->bEndpointAddress;
 974                         port->interrupt_in_buffer = kmalloc(buffer_size,
 975                                                                 GFP_KERNEL);
 976                         if (!port->interrupt_in_buffer) {
 977                                 dev_err(&interface->dev,
 978                                     "Couldn't allocate interrupt_in_buffer\n");
 979                                 goto probe_error;
 980                         }
 981                         usb_fill_int_urb(port->interrupt_in_urb, dev,
 982                                 usb_rcvintpipe(dev,
 983                                                 endpoint->bEndpointAddress),
 984                                 port->interrupt_in_buffer, buffer_size,
 985                                 serial->type->read_int_callback, port,
 986                                 endpoint->bInterval);
 987                 }
 988         } else if (num_interrupt_in) {
 989                 dbg("the device claims to support interrupt in transfers, but read_int_callback is not defined");
 990         }
 991
 992         if (serial->type->write_int_callback) {
 993                 for (i = 0; i < num_interrupt_out; ++i) {
 994                         endpoint = interrupt_out_endpoint[i];
 995                         port = serial->port[i];
 996                         port->interrupt_out_urb = usb_alloc_urb(0, GFP_KERNEL);
 997                         if (!port->interrupt_out_urb) {
 998                                 dev_err(&interface->dev,
 999                                                 "No free urbs available\n");
1000                                 goto probe_error;
1001                         }
1002                         buffer_size = le16_to_cpu(endpoint->wMaxPacketSize);
1003                         port->interrupt_out_size = buffer_size;
1004                         port->interrupt_out_endpointAddress =
1005                                                 endpoint->bEndpointAddress;
1006                         port->interrupt_out_buffer = kmalloc(buffer_size,
1007                                                                 GFP_KERNEL);
1008                         if (!port->interrupt_out_buffer) {
1009                                 dev_err(&interface->dev,
1010                                   "Couldn't allocate interrupt_out_buffer\n");
1011                                 goto probe_error;
1012                         }
1013                         usb_fill_int_urb(port->interrupt_out_urb, dev,
1014                                 usb_sndintpipe(dev,
1015                                                   endpoint->bEndpointAddress),
1016                                 port->interrupt_out_buffer, buffer_size,
1017                                 serial->type->write_int_callback, port,
1018                                 endpoint->bInterval);
1019                 }
1020         } else if (num_interrupt_out) {
1021                 dbg("the device claims to support interrupt out transfers, but write_int_callback is not defined");
1022         }
1023
1024         /* if this device type has an attach function, call it */
1025         if (type->attach) {
1026                 if (!try_module_get(type->driver.owner)) {
1027                         dev_err(&interface->dev,
1028                                         "module get failed, exiting\n");
1029                         goto probe_error;
1030                 }
1031                 retval = type->attach(serial);
1032                 module_put(type->driver.owner);
1033                 if (retval < 0)
1034                         goto probe_error;
1035                 serial->attached = 1;
1036                 if (retval > 0) {
1037                         /* quietly accept this device, but don't bind to a
1038                            serial port as it's about to disappear */
1039                         serial->num_ports = 0;
1040                         goto exit;
1041                 }
1042         } else {
1043                 serial->attached = 1;
1044         }
1045
1046         if (get_free_serial(serial, num_ports, &minor) == NULL) {
1047                 dev_err(&interface->dev, "No more free serial devices\n");
1048                 goto probe_error;
1049         }
1050         serial->minor = minor;
1051
1052         /* register all of the individual ports with the driver core */
1053         for (i = 0; i < num_ports; ++i) {
1054                 port = serial->port[i];
1055                 dev_set_name(&port->dev, "ttyUSB%d", port->number);
1056                 dbg ("%s - registering %s", __func__, dev_name(&port->dev));
1057                 port->dev_state = PORT_REGISTERING;
1058                 retval = device_add(&port->dev);
1059                 if (retval) {
1060                         dev_err(&port->dev, "Error registering port device, "
1061                                 "continuing\n");
1062                         port->dev_state = PORT_UNREGISTERED;
1063                 } else {
1064                         port->dev_state = PORT_REGISTERED;
1065                 }
1066         }
1067
1068         usb_serial_console_init(debug, minor);
1069
1070 exit:
1071         /* success */
1072         usb_set_intfdata(interface, serial);
1073         return 0;
1074
1075 probe_error:
1076         usb_serial_put(serial);
1077         return -EIO;
1078 }
1079 EXPORT_SYMBOL_GPL(usb_serial_probe);
1080
1081 void usb_serial_disconnect(struct usb_interface *interface)
1082 {
1083         int i;
1084         struct usb_serial *serial = usb_get_intfdata(interface);
1085         struct device *dev = &interface->dev;
1086         struct usb_serial_port *port;
1087
1088         usb_serial_console_disconnect(serial);
1089         dbg("%s", __func__);
1090
1091         mutex_lock(&serial->disc_mutex);
1092         usb_set_intfdata(interface, NULL);
1093         /* must set a flag, to signal subdrivers */
1094         serial->disconnected = 1;
1095         mutex_unlock(&serial->disc_mutex);
1096
1097         for (i = 0; i < serial->num_ports; ++i) {
1098                 port = serial->port[i];
1099                 if (port) {
1100                         struct tty_struct *tty = tty_port_tty_get(&port->port);
1101                         if (tty) {
1102                                 tty_vhangup(tty);
1103                                 tty_kref_put(tty);
1104                         }
1105                         kill_traffic(port);
1106                         cancel_work_sync(&port->work);
1107                         if (port->dev_state == PORT_REGISTERED) {
1108
1109                                 /* Make sure the port is bound so that the
1110                                  * driver's port_remove method is called.
1111                                  */
1112                                 if (!port->dev.driver) {
1113                                         int rc;
1114
1115                                         port->dev.driver =
1116                                                         &serial->type->driver;
1117                                         rc = device_bind_driver(&port->dev);
1118                                 }
1119                                 port->dev_state = PORT_UNREGISTERING;
1120                                 device_del(&port->dev);
1121                                 port->dev_state = PORT_UNREGISTERED;
1122                         }
1123                 }
1124         }
1125         serial->type->disconnect(serial);
1126
1127         /* let the last holder of this object cause it to be cleaned up */
1128         usb_serial_put(serial);
1129         dev_info(dev, "device disconnected\n");
1130 }
1131 EXPORT_SYMBOL_GPL(usb_serial_disconnect);
1132
1133 int usb_serial_suspend(struct usb_interface *intf, pm_message_t message)
1134 {
1135         struct usb_serial *serial = usb_get_intfdata(intf);
1136         struct usb_serial_port *port;
1137         int i, r = 0;
1138
1139         serial->suspending = 1;
1140
1141         if (serial->type->suspend) {
1142                 r = serial->type->suspend(serial, message);
1143                 if (r < 0) {
1144                         serial->suspending = 0;
1145                         goto err_out;
1146                 }
1147         }
1148
1149         for (i = 0; i < serial->num_ports; ++i) {
1150                 port = serial->port[i];
1151                 if (port)
1152                         kill_traffic(port);
1153         }
1154
1155 err_out:
1156         return r;
1157 }
1158 EXPORT_SYMBOL(usb_serial_suspend);
1159
1160 int usb_serial_resume(struct usb_interface *intf)
1161 {
1162         struct usb_serial *serial = usb_get_intfdata(intf);
1163         int rv;
1164
1165         serial->suspending = 0;
1166         if (serial->type->resume)
1167                 rv = serial->type->resume(serial);
1168         else
1169                 rv = usb_serial_generic_resume(serial);
1170
1171         return rv;
1172 }
1173 EXPORT_SYMBOL(usb_serial_resume);
1174
1175 static const struct tty_operations serial_ops = {
1176         .open =                 serial_open,
1177         .close =                serial_close,
1178         .write =                serial_write,
1179         .hangup =               serial_hangup,
1180         .write_room =           serial_write_room,
1181         .ioctl =                serial_ioctl,
1182         .set_termios =          serial_set_termios,
1183         .throttle =             serial_throttle,
1184         .unthrottle =           serial_unthrottle,
1185         .break_ctl =            serial_break,
1186         .chars_in_buffer =      serial_chars_in_buffer,
1187         .tiocmget =             serial_tiocmget,
1188         .tiocmset =             serial_tiocmset,
1189         .cleanup =              serial_cleanup,
1190         .install =              serial_install,
1191         .proc_fops =            &serial_proc_fops,
1192 };
1193
1194
1195 struct tty_driver *usb_serial_tty_driver;
1196
1197 static int __init usb_serial_init(void)
1198 {
1199         int i;
1200         int result;
1201
1202         usb_serial_tty_driver = alloc_tty_driver(SERIAL_TTY_MINORS);
1203         if (!usb_serial_tty_driver)
1204                 return -ENOMEM;
1205
1206         /* Initialize our global data */
1207         for (i = 0; i < SERIAL_TTY_MINORS; ++i)
1208                 serial_table[i] = NULL;
1209
1210         result = bus_register(&usb_serial_bus_type);
1211         if (result) {
1212                 printk(KERN_ERR "usb-serial: %s - registering bus driver "
1213                        "failed\n", __func__);
1214                 goto exit_bus;
1215         }
1216
1217         usb_serial_tty_driver->owner = THIS_MODULE;
1218         usb_serial_tty_driver->driver_name = "usbserial";
1219         usb_serial_tty_driver->name =   "ttyUSB";
1220         usb_serial_tty_driver->major = SERIAL_TTY_MAJOR;
1221         usb_serial_tty_driver->minor_start = 0;
1222         usb_serial_tty_driver->type = TTY_DRIVER_TYPE_SERIAL;
1223         usb_serial_tty_driver->subtype = SERIAL_TYPE_NORMAL;
1224         usb_serial_tty_driver->flags = TTY_DRIVER_REAL_RAW |
1225                                                 TTY_DRIVER_DYNAMIC_DEV;
1226         usb_serial_tty_driver->init_termios = tty_std_termios;
1227         usb_serial_tty_driver->init_termios.c_cflag = B9600 | CS8 | CREAD
1228                                                         | HUPCL | CLOCAL;
1229         usb_serial_tty_driver->init_termios.c_ispeed = 9600;
1230         usb_serial_tty_driver->init_termios.c_ospeed = 9600;
1231         tty_set_operations(usb_serial_tty_driver, &serial_ops);
1232         result = tty_register_driver(usb_serial_tty_driver);
1233         if (result) {
1234                 printk(KERN_ERR "usb-serial: %s - tty_register_driver failed\n",
1235                        __func__);
1236                 goto exit_reg_driver;
1237         }
1238
1239         /* register the USB driver */
1240         result = usb_register(&usb_serial_driver);
1241         if (result < 0) {
1242                 printk(KERN_ERR "usb-serial: %s - usb_register failed\n",
1243                        __func__);
1244                 goto exit_tty;
1245         }
1246
1247         /* register the generic driver, if we should */
1248         result = usb_serial_generic_register(debug);
1249         if (result < 0) {
1250                 printk(KERN_ERR "usb-serial: %s - registering generic "
1251                        "driver failed\n", __func__);
1252                 goto exit_generic;
1253         }
1254
1255         printk(KERN_INFO KBUILD_MODNAME ": " DRIVER_DESC "\n");
1256
1257         return result;
1258
1259 exit_generic:
1260         usb_deregister(&usb_serial_driver);
1261
1262 exit_tty:
1263         tty_unregister_driver(usb_serial_tty_driver);
1264
1265 exit_reg_driver:
1266         bus_unregister(&usb_serial_bus_type);
1267
1268 exit_bus:
1269         printk(KERN_ERR "usb-serial: %s - returning with error %d\n",
1270                __func__, result);
1271         put_tty_driver(usb_serial_tty_driver);
1272         return result;
1273 }
1274
1275
1276 static void __exit usb_serial_exit(void)
1277 {
1278         usb_serial_console_exit();
1279
1280         usb_serial_generic_deregister();
1281
1282         usb_deregister(&usb_serial_driver);
1283         tty_unregister_driver(usb_serial_tty_driver);
1284         put_tty_driver(usb_serial_tty_driver);
1285         bus_unregister(&usb_serial_bus_type);
1286 }
1287
1288
1289 module_init(usb_serial_init);
1290 module_exit(usb_serial_exit);
1291
1292 #define set_to_generic_if_null(type, function)                          \
1293         do {                                                            \
1294                 if (!type->function) {                                  \
1295                         type->function = usb_serial_generic_##function; \
1296                         dbg("Had to override the " #function            \
1297                                 " usb serial operation with the generic one.");\
1298                         }                                               \
1299         } while (0)
1300
1301 static void fixup_generic(struct usb_serial_driver *device)
1302 {
1303         set_to_generic_if_null(device, open);
1304         set_to_generic_if_null(device, write);
1305         set_to_generic_if_null(device, close);
1306         set_to_generic_if_null(device, write_room);
1307         set_to_generic_if_null(device, chars_in_buffer);
1308         set_to_generic_if_null(device, read_bulk_callback);
1309         set_to_generic_if_null(device, write_bulk_callback);
1310         set_to_generic_if_null(device, disconnect);
1311         set_to_generic_if_null(device, release);
1312 }
1313
1314 int usb_serial_register(struct usb_serial_driver *driver)
1315 {
1316         /* must be called with BKL held */
1317         int retval;
1318
1319         if (usb_disabled())
1320                 return -ENODEV;
1321
1322         fixup_generic(driver);
1323
1324         if (!driver->description)
1325                 driver->description = driver->driver.name;
1326
1327         /* Add this device to our list of devices */
1328         list_add(&driver->driver_list, &usb_serial_driver_list);
1329
1330         retval = usb_serial_bus_register(driver);
1331         if (retval) {
1332                 printk(KERN_ERR "usb-serial: problem %d when registering "
1333                        "driver %s\n", retval, driver->description);
1334                 list_del(&driver->driver_list);
1335         } else
1336                 printk(KERN_INFO "USB Serial support registered for %s\n",
1337                                                 driver->description);
1338
1339         return retval;
1340 }
1341 EXPORT_SYMBOL_GPL(usb_serial_register);
1342
1343
1344 void usb_serial_deregister(struct usb_serial_driver *device)
1345 {
1346         /* must be called with BKL held */
1347         printk(KERN_INFO "USB Serial deregistering driver %s\n",
1348                device->description);
1349         list_del(&device->driver_list);
1350         usb_serial_bus_deregister(device);
1351 }
1352 EXPORT_SYMBOL_GPL(usb_serial_deregister);
1353
1354 /* Module information */
1355 MODULE_AUTHOR(DRIVER_AUTHOR);
1356 MODULE_DESCRIPTION(DRIVER_DESC);
1357 MODULE_LICENSE("GPL");
1358
1359 module_param(debug, bool, S_IRUGO | S_IWUSR);
1360 MODULE_PARM_DESC(debug, "Debug enabled or not");