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         kfifo_free(&port->write_fifo);
 599         kfree(port->bulk_in_buffer);
 600         kfree(port->bulk_out_buffer);
 601         kfree(port->interrupt_in_buffer);
 602         kfree(port->interrupt_out_buffer);
 603         kfree(port);
 604 }
 605
 606 static struct usb_serial *create_serial(struct usb_device *dev,
 607                                         struct usb_interface *interface,
 608                                         struct usb_serial_driver *driver)
 609 {
 610         struct usb_serial *serial;
 611
 612         serial = kzalloc(sizeof(*serial), GFP_KERNEL);
 613         if (!serial) {
 614                 dev_err(&dev->dev, "%s - out of memory\n", __func__);
 615                 return NULL;
 616         }
 617         serial->dev = usb_get_dev(dev);
 618         serial->type = driver;
 619         serial->interface = interface;
 620         kref_init(&serial->kref);
 621         mutex_init(&serial->disc_mutex);
 622         serial->minor = SERIAL_TTY_NO_MINOR;
 623
 624         return serial;
 625 }
 626
 627 static const struct usb_device_id *match_dynamic_id(struct usb_interface *intf,
 628                                             struct usb_serial_driver *drv)
 629 {
 630         struct usb_dynid *dynid;
 631
 632         spin_lock(&drv->dynids.lock);
 633         list_for_each_entry(dynid, &drv->dynids.list, node) {
 634                 if (usb_match_one_id(intf, &dynid->id)) {
 635                         spin_unlock(&drv->dynids.lock);
 636                         return &dynid->id;
 637                 }
 638         }
 639         spin_unlock(&drv->dynids.lock);
 640         return NULL;
 641 }
 642
 643 static const struct usb_device_id *get_iface_id(struct usb_serial_driver *drv,
 644                                                 struct usb_interface *intf)
 645 {
 646         const struct usb_device_id *id;
 647
 648         id = usb_match_id(intf, drv->id_table);
 649         if (id) {
 650                 dbg("static descriptor matches");
 651                 goto exit;
 652         }
 653         id = match_dynamic_id(intf, drv);
 654         if (id)
 655                 dbg("dynamic descriptor matches");
 656 exit:
 657         return id;
 658 }
 659
 660 static struct usb_serial_driver *search_serial_device(
 661                                         struct usb_interface *iface)
 662 {
 663         const struct usb_device_id *id;
 664         struct usb_serial_driver *drv;
 665
 666         /* Check if the usb id matches a known device */
 667         list_for_each_entry(drv, &usb_serial_driver_list, driver_list) {
 668                 id = get_iface_id(drv, iface);
 669                 if (id)
 670                         return drv;
 671         }
 672
 673         return NULL;
 674 }
 675
 676 static int serial_carrier_raised(struct tty_port *port)
 677 {
 678         struct usb_serial_port *p = container_of(port, struct usb_serial_port, port);
 679         struct usb_serial_driver *drv = p->serial->type;
 680         if (drv->carrier_raised)
 681                 return drv->carrier_raised(p);
 682         /* No carrier control - don't block */
 683         return 1;
 684 }
 685
 686 static void serial_dtr_rts(struct tty_port *port, int on)
 687 {
 688         struct usb_serial_port *p = container_of(port, struct usb_serial_port, port);
 689         struct usb_serial_driver *drv = p->serial->type;
 690         if (drv->dtr_rts)
 691                 drv->dtr_rts(p, on);
 692 }
 693
 694 static const struct tty_port_operations serial_port_ops = {
 695         .carrier_raised = serial_carrier_raised,
 696         .dtr_rts = serial_dtr_rts,
 697         .activate = serial_activate,
 698         .shutdown = serial_down,
 699 };
 700
 701 int usb_serial_probe(struct usb_interface *interface,
 702                                const struct usb_device_id *id)
 703 {
 704         struct usb_device *dev = interface_to_usbdev(interface);
 705         struct usb_serial *serial = NULL;
 706         struct usb_serial_port *port;
 707         struct usb_host_interface *iface_desc;
 708         struct usb_endpoint_descriptor *endpoint;
 709         struct usb_endpoint_descriptor *interrupt_in_endpoint[MAX_NUM_PORTS];
 710         struct usb_endpoint_descriptor *interrupt_out_endpoint[MAX_NUM_PORTS];
 711         struct usb_endpoint_descriptor *bulk_in_endpoint[MAX_NUM_PORTS];
 712         struct usb_endpoint_descriptor *bulk_out_endpoint[MAX_NUM_PORTS];
 713         struct usb_serial_driver *type = NULL;
 714         int retval;
 715         unsigned int minor;
 716         int buffer_size;
 717         int i;
 718         int num_interrupt_in = 0;
 719         int num_interrupt_out = 0;
 720         int num_bulk_in = 0;
 721         int num_bulk_out = 0;
 722         int num_ports = 0;
 723         int max_endpoints;
 724
 725         lock_kernel(); /* guard against unloading a serial driver module */
 726         type = search_serial_device(interface);
 727         if (!type) {
 728                 unlock_kernel();
 729                 dbg("none matched");
 730                 return -ENODEV;
 731         }
 732
 733         serial = create_serial(dev, interface, type);
 734         if (!serial) {
 735                 unlock_kernel();
 736                 dev_err(&interface->dev, "%s - out of memory\n", __func__);
 737                 return -ENOMEM;
 738         }
 739
 740         /* if this device type has a probe function, call it */
 741         if (type->probe) {
 742                 const struct usb_device_id *id;
 743
 744                 if (!try_module_get(type->driver.owner)) {
 745                         unlock_kernel();
 746                         dev_err(&interface->dev,
 747                                 "module get failed, exiting\n");
 748                         kfree(serial);
 749                         return -EIO;
 750                 }
 751
 752                 id = get_iface_id(type, interface);
 753                 retval = type->probe(serial, id);
 754                 module_put(type->driver.owner);
 755
 756                 if (retval) {
 757                         unlock_kernel();
 758                         dbg("sub driver rejected device");
 759                         kfree(serial);
 760                         return retval;
 761                 }
 762         }
 763
 764         /* descriptor matches, let's find the endpoints needed */
 765         /* check out the endpoints */
 766         iface_desc = interface->cur_altsetting;
 767         for (i = 0; i < iface_desc->desc.bNumEndpoints; ++i) {
 768                 endpoint = &iface_desc->endpoint[i].desc;
 769
 770                 if (usb_endpoint_is_bulk_in(endpoint)) {
 771                         /* we found a bulk in endpoint */
 772                         dbg("found bulk in on endpoint %d", i);
 773                         bulk_in_endpoint[num_bulk_in] = endpoint;
 774                         ++num_bulk_in;
 775                 }
 776
 777                 if (usb_endpoint_is_bulk_out(endpoint)) {
 778                         /* we found a bulk out endpoint */
 779                         dbg("found bulk out on endpoint %d", i);
 780                         bulk_out_endpoint[num_bulk_out] = endpoint;
 781                         ++num_bulk_out;
 782                 }
 783
 784                 if (usb_endpoint_is_int_in(endpoint)) {
 785                         /* we found a interrupt in endpoint */
 786                         dbg("found interrupt in on endpoint %d", i);
 787                         interrupt_in_endpoint[num_interrupt_in] = endpoint;
 788                         ++num_interrupt_in;
 789                 }
 790
 791                 if (usb_endpoint_is_int_out(endpoint)) {
 792                         /* we found an interrupt out endpoint */
 793                         dbg("found interrupt out on endpoint %d", i);
 794                         interrupt_out_endpoint[num_interrupt_out] = endpoint;
 795                         ++num_interrupt_out;
 796                 }
 797         }
 798
 799 #if defined(CONFIG_USB_SERIAL_PL2303) || defined(CONFIG_USB_SERIAL_PL2303_MODULE)
 800         /* BEGIN HORRIBLE HACK FOR PL2303 */
 801         /* this is needed due to the looney way its endpoints are set up */
 802         if (((le16_to_cpu(dev->descriptor.idVendor) == PL2303_VENDOR_ID) &&
 803              (le16_to_cpu(dev->descriptor.idProduct) == PL2303_PRODUCT_ID)) ||
 804             ((le16_to_cpu(dev->descriptor.idVendor) == ATEN_VENDOR_ID) &&
 805              (le16_to_cpu(dev->descriptor.idProduct) == ATEN_PRODUCT_ID)) ||
 806             ((le16_to_cpu(dev->descriptor.idVendor) == ALCOR_VENDOR_ID) &&
 807              (le16_to_cpu(dev->descriptor.idProduct) == ALCOR_PRODUCT_ID)) ||
 808             ((le16_to_cpu(dev->descriptor.idVendor) == SIEMENS_VENDOR_ID) &&
 809              (le16_to_cpu(dev->descriptor.idProduct) == SIEMENS_PRODUCT_ID_EF81))) {
 810                 if (interface != dev->actconfig->interface[0]) {
 811                         /* check out the endpoints of the other interface*/
 812                         iface_desc = dev->actconfig->interface[0]->cur_altsetting;
 813                         for (i = 0; i < iface_desc->desc.bNumEndpoints; ++i) {
 814                                 endpoint = &iface_desc->endpoint[i].desc;
 815                                 if (usb_endpoint_is_int_in(endpoint)) {
 816                                         /* we found a interrupt in endpoint */
 817                                         dbg("found interrupt in for Prolific device on separate interface");
 818                                         interrupt_in_endpoint[num_interrupt_in] = endpoint;
 819                                         ++num_interrupt_in;
 820                                 }
 821                         }
 822                 }
 823
 824                 /* Now make sure the PL-2303 is configured correctly.
 825                  * If not, give up now and hope this hack will work
 826                  * properly during a later invocation of usb_serial_probe
 827                  */
 828                 if (num_bulk_in == 0 || num_bulk_out == 0) {
 829                         unlock_kernel();
 830                         dev_info(&interface->dev, "PL-2303 hack: descriptors matched but endpoints did not\n");
 831                         kfree(serial);
 832                         return -ENODEV;
 833                 }
 834         }
 835         /* END HORRIBLE HACK FOR PL2303 */
 836 #endif
 837
 838 #ifdef CONFIG_USB_SERIAL_GENERIC
 839         if (type == &usb_serial_generic_device) {
 840                 num_ports = num_bulk_out;
 841                 if (num_ports == 0) {
 842                         unlock_kernel();
 843                         dev_err(&interface->dev,
 844                             "Generic device with no bulk out, not allowed.\n");
 845                         kfree(serial);
 846                         return -EIO;
 847                 }
 848         }
 849 #endif
 850         if (!num_ports) {
 851                 /* if this device type has a calc_num_ports function, call it */
 852                 if (type->calc_num_ports) {
 853                         if (!try_module_get(type->driver.owner)) {
 854                                 unlock_kernel();
 855                                 dev_err(&interface->dev,
 856                                         "module get failed, exiting\n");
 857                                 kfree(serial);
 858                                 return -EIO;
 859                         }
 860                         num_ports = type->calc_num_ports(serial);
 861                         module_put(type->driver.owner);
 862                 }
 863                 if (!num_ports)
 864                         num_ports = type->num_ports;
 865         }
 866
 867         serial->num_ports = num_ports;
 868         serial->num_bulk_in = num_bulk_in;
 869         serial->num_bulk_out = num_bulk_out;
 870         serial->num_interrupt_in = num_interrupt_in;
 871         serial->num_interrupt_out = num_interrupt_out;
 872
 873         /* found all that we need */
 874         dev_info(&interface->dev, "%s converter detected\n",
 875                         type->description);
 876
 877         /* create our ports, we need as many as the max endpoints */
 878         /* we don't use num_ports here because some devices have more
 879            endpoint pairs than ports */
 880         max_endpoints = max(num_bulk_in, num_bulk_out);
 881         max_endpoints = max(max_endpoints, num_interrupt_in);
 882         max_endpoints = max(max_endpoints, num_interrupt_out);
 883         max_endpoints = max(max_endpoints, (int)serial->num_ports);
 884         serial->num_port_pointers = max_endpoints;
 885         unlock_kernel();
 886
 887         dbg("%s - setting up %d port structures for this device",
 888                                                 __func__, max_endpoints);
 889         for (i = 0; i < max_endpoints; ++i) {
 890                 port = kzalloc(sizeof(struct usb_serial_port), GFP_KERNEL);
 891                 if (!port)
 892                         goto probe_error;
 893                 tty_port_init(&port->port);
 894                 port->port.ops = &serial_port_ops;
 895                 port->serial = serial;
 896                 spin_lock_init(&port->lock);
 897                 /* Keep this for private driver use for the moment but
 898                    should probably go away */
 899                 INIT_WORK(&port->work, usb_serial_port_work);
 900                 serial->port[i] = port;
 901                 port->dev.parent = &interface->dev;
 902                 port->dev.driver = NULL;
 903                 port->dev.bus = &usb_serial_bus_type;
 904                 port->dev.release = &port_release;
 905                 device_initialize(&port->dev);
 906         }
 907
 908         /* set up the endpoint information */
 909         for (i = 0; i < num_bulk_in; ++i) {
 910                 endpoint = bulk_in_endpoint[i];
 911                 port = serial->port[i];
 912                 port->read_urb = usb_alloc_urb(0, GFP_KERNEL);
 913                 if (!port->read_urb) {
 914                         dev_err(&interface->dev, "No free urbs available\n");
 915                         goto probe_error;
 916                 }
 917                 buffer_size = le16_to_cpu(endpoint->wMaxPacketSize);
 918                 port->bulk_in_size = buffer_size;
 919                 port->bulk_in_endpointAddress = endpoint->bEndpointAddress;
 920                 port->bulk_in_buffer = kmalloc(buffer_size, GFP_KERNEL);
 921                 if (!port->bulk_in_buffer) {
 922                         dev_err(&interface->dev,
 923                                         "Couldn't allocate bulk_in_buffer\n");
 924                         goto probe_error;
 925                 }
 926                 usb_fill_bulk_urb(port->read_urb, dev,
 927                                 usb_rcvbulkpipe(dev,
 928                                                 endpoint->bEndpointAddress),
 929                                 port->bulk_in_buffer, buffer_size,
 930                                 serial->type->read_bulk_callback, port);
 931         }
 932
 933         for (i = 0; i < num_bulk_out; ++i) {
 934                 endpoint = bulk_out_endpoint[i];
 935                 port = serial->port[i];
 936                 port->write_urb = usb_alloc_urb(0, GFP_KERNEL);
 937                 if (!port->write_urb) {
 938                         dev_err(&interface->dev, "No free urbs available\n");
 939                         goto probe_error;
 940                 }
 941                 if (kfifo_alloc(&port->write_fifo, PAGE_SIZE, GFP_KERNEL))
 942                         goto probe_error;
 943                 buffer_size = le16_to_cpu(endpoint->wMaxPacketSize);
 944                 port->bulk_out_size = buffer_size;
 945                 port->bulk_out_endpointAddress = endpoint->bEndpointAddress;
 946                 port->bulk_out_buffer = kmalloc(buffer_size, GFP_KERNEL);
 947                 if (!port->bulk_out_buffer) {
 948                         dev_err(&interface->dev,
 949                                         "Couldn't allocate bulk_out_buffer\n");
 950                         goto probe_error;
 951                 }
 952                 usb_fill_bulk_urb(port->write_urb, dev,
 953                                 usb_sndbulkpipe(dev,
 954                                         endpoint->bEndpointAddress),
 955                                 port->bulk_out_buffer, buffer_size,
 956                                 serial->type->write_bulk_callback, port);
 957         }
 958
 959         if (serial->type->read_int_callback) {
 960                 for (i = 0; i < num_interrupt_in; ++i) {
 961                         endpoint = interrupt_in_endpoint[i];
 962                         port = serial->port[i];
 963                         port->interrupt_in_urb = usb_alloc_urb(0, GFP_KERNEL);
 964                         if (!port->interrupt_in_urb) {
 965                                 dev_err(&interface->dev,
 966                                                 "No free urbs available\n");
 967                                 goto probe_error;
 968                         }
 969                         buffer_size = le16_to_cpu(endpoint->wMaxPacketSize);
 970                         port->interrupt_in_endpointAddress =
 971                                                 endpoint->bEndpointAddress;
 972                         port->interrupt_in_buffer = kmalloc(buffer_size,
 973                                                                 GFP_KERNEL);
 974                         if (!port->interrupt_in_buffer) {
 975                                 dev_err(&interface->dev,
 976                                     "Couldn't allocate interrupt_in_buffer\n");
 977                                 goto probe_error;
 978                         }
 979                         usb_fill_int_urb(port->interrupt_in_urb, dev,
 980                                 usb_rcvintpipe(dev,
 981                                                 endpoint->bEndpointAddress),
 982                                 port->interrupt_in_buffer, buffer_size,
 983                                 serial->type->read_int_callback, port,
 984                                 endpoint->bInterval);
 985                 }
 986         } else if (num_interrupt_in) {
 987                 dbg("the device claims to support interrupt in transfers, but read_int_callback is not defined");
 988         }
 989
 990         if (serial->type->write_int_callback) {
 991                 for (i = 0; i < num_interrupt_out; ++i) {
 992                         endpoint = interrupt_out_endpoint[i];
 993                         port = serial->port[i];
 994                         port->interrupt_out_urb = usb_alloc_urb(0, GFP_KERNEL);
 995                         if (!port->interrupt_out_urb) {
 996                                 dev_err(&interface->dev,
 997                                                 "No free urbs available\n");
 998                                 goto probe_error;
 999                         }
1000                         buffer_size = le16_to_cpu(endpoint->wMaxPacketSize);
1001                         port->interrupt_out_size = buffer_size;
1002                         port->interrupt_out_endpointAddress =
1003                                                 endpoint->bEndpointAddress;
1004                         port->interrupt_out_buffer = kmalloc(buffer_size,
1005                                                                 GFP_KERNEL);
1006                         if (!port->interrupt_out_buffer) {
1007                                 dev_err(&interface->dev,
1008                                   "Couldn't allocate interrupt_out_buffer\n");
1009                                 goto probe_error;
1010                         }
1011                         usb_fill_int_urb(port->interrupt_out_urb, dev,
1012                                 usb_sndintpipe(dev,
1013                                                   endpoint->bEndpointAddress),
1014                                 port->interrupt_out_buffer, buffer_size,
1015                                 serial->type->write_int_callback, port,
1016                                 endpoint->bInterval);
1017                 }
1018         } else if (num_interrupt_out) {
1019                 dbg("the device claims to support interrupt out transfers, but write_int_callback is not defined");
1020         }
1021
1022         /* if this device type has an attach function, call it */
1023         if (type->attach) {
1024                 if (!try_module_get(type->driver.owner)) {
1025                         dev_err(&interface->dev,
1026                                         "module get failed, exiting\n");
1027                         goto probe_error;
1028                 }
1029                 retval = type->attach(serial);
1030                 module_put(type->driver.owner);
1031                 if (retval < 0)
1032                         goto probe_error;
1033                 serial->attached = 1;
1034                 if (retval > 0) {
1035                         /* quietly accept this device, but don't bind to a
1036                            serial port as it's about to disappear */
1037                         serial->num_ports = 0;
1038                         goto exit;
1039                 }
1040         } else {
1041                 serial->attached = 1;
1042         }
1043
1044         if (get_free_serial(serial, num_ports, &minor) == NULL) {
1045                 dev_err(&interface->dev, "No more free serial devices\n");
1046                 goto probe_error;
1047         }
1048         serial->minor = minor;
1049
1050         /* register all of the individual ports with the driver core */
1051         for (i = 0; i < num_ports; ++i) {
1052                 port = serial->port[i];
1053                 dev_set_name(&port->dev, "ttyUSB%d", port->number);
1054                 dbg ("%s - registering %s", __func__, dev_name(&port->dev));
1055                 port->dev_state = PORT_REGISTERING;
1056                 retval = device_add(&port->dev);
1057                 if (retval) {
1058                         dev_err(&port->dev, "Error registering port device, "
1059                                 "continuing\n");
1060                         port->dev_state = PORT_UNREGISTERED;
1061                 } else {
1062                         port->dev_state = PORT_REGISTERED;
1063                 }
1064         }
1065
1066         usb_serial_console_init(debug, minor);
1067
1068 exit:
1069         /* success */
1070         usb_set_intfdata(interface, serial);
1071         return 0;
1072
1073 probe_error:
1074         usb_serial_put(serial);
1075         return -EIO;
1076 }
1077 EXPORT_SYMBOL_GPL(usb_serial_probe);
1078
1079 void usb_serial_disconnect(struct usb_interface *interface)
1080 {
1081         int i;
1082         struct usb_serial *serial = usb_get_intfdata(interface);
1083         struct device *dev = &interface->dev;
1084         struct usb_serial_port *port;
1085
1086         usb_serial_console_disconnect(serial);
1087         dbg("%s", __func__);
1088
1089         mutex_lock(&serial->disc_mutex);
1090         usb_set_intfdata(interface, NULL);
1091         /* must set a flag, to signal subdrivers */
1092         serial->disconnected = 1;
1093         mutex_unlock(&serial->disc_mutex);
1094
1095         for (i = 0; i < serial->num_ports; ++i) {
1096                 port = serial->port[i];
1097                 if (port) {
1098                         struct tty_struct *tty = tty_port_tty_get(&port->port);
1099                         if (tty) {
1100                                 tty_vhangup(tty);
1101                                 tty_kref_put(tty);
1102                         }
1103                         kill_traffic(port);
1104                         cancel_work_sync(&port->work);
1105                         if (port->dev_state == PORT_REGISTERED) {
1106
1107                                 /* Make sure the port is bound so that the
1108                                  * driver's port_remove method is called.
1109                                  */
1110                                 if (!port->dev.driver) {
1111                                         int rc;
1112
1113                                         port->dev.driver =
1114                                                         &serial->type->driver;
1115                                         rc = device_bind_driver(&port->dev);
1116                                 }
1117                                 port->dev_state = PORT_UNREGISTERING;
1118                                 device_del(&port->dev);
1119                                 port->dev_state = PORT_UNREGISTERED;
1120                         }
1121                 }
1122         }
1123         serial->type->disconnect(serial);
1124
1125         /* let the last holder of this object cause it to be cleaned up */
1126         usb_serial_put(serial);
1127         dev_info(dev, "device disconnected\n");
1128 }
1129 EXPORT_SYMBOL_GPL(usb_serial_disconnect);
1130
1131 int usb_serial_suspend(struct usb_interface *intf, pm_message_t message)
1132 {
1133         struct usb_serial *serial = usb_get_intfdata(intf);
1134         struct usb_serial_port *port;
1135         int i, r = 0;
1136
1137         serial->suspending = 1;
1138
1139         if (serial->type->suspend) {
1140                 r = serial->type->suspend(serial, message);
1141                 if (r < 0) {
1142                         serial->suspending = 0;
1143                         goto err_out;
1144                 }
1145         }
1146
1147         for (i = 0; i < serial->num_ports; ++i) {
1148                 port = serial->port[i];
1149                 if (port)
1150                         kill_traffic(port);
1151         }
1152
1153 err_out:
1154         return r;
1155 }
1156 EXPORT_SYMBOL(usb_serial_suspend);
1157
1158 int usb_serial_resume(struct usb_interface *intf)
1159 {
1160         struct usb_serial *serial = usb_get_intfdata(intf);
1161         int rv;
1162
1163         serial->suspending = 0;
1164         if (serial->type->resume)
1165                 rv = serial->type->resume(serial);
1166         else
1167                 rv = usb_serial_generic_resume(serial);
1168
1169         return rv;
1170 }
1171 EXPORT_SYMBOL(usb_serial_resume);
1172
1173 static const struct tty_operations serial_ops = {
1174         .open =                 serial_open,
1175         .close =                serial_close,
1176         .write =                serial_write,
1177         .hangup =               serial_hangup,
1178         .write_room =           serial_write_room,
1179         .ioctl =                serial_ioctl,
1180         .set_termios =          serial_set_termios,
1181         .throttle =             serial_throttle,
1182         .unthrottle =           serial_unthrottle,
1183         .break_ctl =            serial_break,
1184         .chars_in_buffer =      serial_chars_in_buffer,
1185         .tiocmget =             serial_tiocmget,
1186         .tiocmset =             serial_tiocmset,
1187         .cleanup =              serial_cleanup,
1188         .install =              serial_install,
1189         .proc_fops =            &serial_proc_fops,
1190 };
1191
1192
1193 struct tty_driver *usb_serial_tty_driver;
1194
1195 static int __init usb_serial_init(void)
1196 {
1197         int i;
1198         int result;
1199
1200         usb_serial_tty_driver = alloc_tty_driver(SERIAL_TTY_MINORS);
1201         if (!usb_serial_tty_driver)
1202                 return -ENOMEM;
1203
1204         /* Initialize our global data */
1205         for (i = 0; i < SERIAL_TTY_MINORS; ++i)
1206                 serial_table[i] = NULL;
1207
1208         result = bus_register(&usb_serial_bus_type);
1209         if (result) {
1210                 printk(KERN_ERR "usb-serial: %s - registering bus driver "
1211                        "failed\n", __func__);
1212                 goto exit_bus;
1213         }
1214
1215         usb_serial_tty_driver->owner = THIS_MODULE;
1216         usb_serial_tty_driver->driver_name = "usbserial";
1217         usb_serial_tty_driver->name =   "ttyUSB";
1218         usb_serial_tty_driver->major = SERIAL_TTY_MAJOR;
1219         usb_serial_tty_driver->minor_start = 0;
1220         usb_serial_tty_driver->type = TTY_DRIVER_TYPE_SERIAL;
1221         usb_serial_tty_driver->subtype = SERIAL_TYPE_NORMAL;
1222         usb_serial_tty_driver->flags = TTY_DRIVER_REAL_RAW |
1223                                                 TTY_DRIVER_DYNAMIC_DEV;
1224         usb_serial_tty_driver->init_termios = tty_std_termios;
1225         usb_serial_tty_driver->init_termios.c_cflag = B9600 | CS8 | CREAD
1226                                                         | HUPCL | CLOCAL;
1227         usb_serial_tty_driver->init_termios.c_ispeed = 9600;
1228         usb_serial_tty_driver->init_termios.c_ospeed = 9600;
1229         tty_set_operations(usb_serial_tty_driver, &serial_ops);
1230         result = tty_register_driver(usb_serial_tty_driver);
1231         if (result) {
1232                 printk(KERN_ERR "usb-serial: %s - tty_register_driver failed\n",
1233                        __func__);
1234                 goto exit_reg_driver;
1235         }
1236
1237         /* register the USB driver */
1238         result = usb_register(&usb_serial_driver);
1239         if (result < 0) {
1240                 printk(KERN_ERR "usb-serial: %s - usb_register failed\n",
1241                        __func__);
1242                 goto exit_tty;
1243         }
1244
1245         /* register the generic driver, if we should */
1246         result = usb_serial_generic_register(debug);
1247         if (result < 0) {
1248                 printk(KERN_ERR "usb-serial: %s - registering generic "
1249                        "driver failed\n", __func__);
1250                 goto exit_generic;
1251         }
1252
1253         printk(KERN_INFO KBUILD_MODNAME ": " DRIVER_DESC "\n");
1254
1255         return result;
1256
1257 exit_generic:
1258         usb_deregister(&usb_serial_driver);
1259
1260 exit_tty:
1261         tty_unregister_driver(usb_serial_tty_driver);
1262
1263 exit_reg_driver:
1264         bus_unregister(&usb_serial_bus_type);
1265
1266 exit_bus:
1267         printk(KERN_ERR "usb-serial: %s - returning with error %d\n",
1268                __func__, result);
1269         put_tty_driver(usb_serial_tty_driver);
1270         return result;
1271 }
1272
1273
1274 static void __exit usb_serial_exit(void)
1275 {
1276         usb_serial_console_exit();
1277
1278         usb_serial_generic_deregister();
1279
1280         usb_deregister(&usb_serial_driver);
1281         tty_unregister_driver(usb_serial_tty_driver);
1282         put_tty_driver(usb_serial_tty_driver);
1283         bus_unregister(&usb_serial_bus_type);
1284 }
1285
1286
1287 module_init(usb_serial_init);
1288 module_exit(usb_serial_exit);
1289
1290 #define set_to_generic_if_null(type, function)                          \
1291         do {                                                            \
1292                 if (!type->function) {                                  \
1293                         type->function = usb_serial_generic_##function; \
1294                         dbg("Had to override the " #function            \
1295                                 " usb serial operation with the generic one.");\
1296                         }                                               \
1297         } while (0)
1298
1299 static void fixup_generic(struct usb_serial_driver *device)
1300 {
1301         set_to_generic_if_null(device, open);
1302         set_to_generic_if_null(device, write);
1303         set_to_generic_if_null(device, close);
1304         set_to_generic_if_null(device, write_room);
1305         set_to_generic_if_null(device, chars_in_buffer);
1306         set_to_generic_if_null(device, read_bulk_callback);
1307         set_to_generic_if_null(device, write_bulk_callback);
1308         set_to_generic_if_null(device, disconnect);
1309         set_to_generic_if_null(device, release);
1310 }
1311
1312 int usb_serial_register(struct usb_serial_driver *driver)
1313 {
1314         /* must be called with BKL held */
1315         int retval;
1316
1317         if (usb_disabled())
1318                 return -ENODEV;
1319
1320         fixup_generic(driver);
1321
1322         if (!driver->description)
1323                 driver->description = driver->driver.name;
1324
1325         /* Add this device to our list of devices */
1326         list_add(&driver->driver_list, &usb_serial_driver_list);
1327
1328         retval = usb_serial_bus_register(driver);
1329         if (retval) {
1330                 printk(KERN_ERR "usb-serial: problem %d when registering "
1331                        "driver %s\n", retval, driver->description);
1332                 list_del(&driver->driver_list);
1333         } else
1334                 printk(KERN_INFO "USB Serial support registered for %s\n",
1335                                                 driver->description);
1336
1337         return retval;
1338 }
1339 EXPORT_SYMBOL_GPL(usb_serial_register);
1340
1341
1342 void usb_serial_deregister(struct usb_serial_driver *device)
1343 {
1344         /* must be called with BKL held */
1345         printk(KERN_INFO "USB Serial deregistering driver %s\n",
1346                device->description);
1347         list_del(&device->driver_list);
1348         usb_serial_bus_deregister(device);
1349 }
1350 EXPORT_SYMBOL_GPL(usb_serial_deregister);
1351
1352 /* Module information */
1353 MODULE_AUTHOR(DRIVER_AUTHOR);
1354 MODULE_DESCRIPTION(DRIVER_DESC);
1355 MODULE_LICENSE("GPL");
1356
1357 module_param(debug, bool, S_IRUGO | S_IWUSR);
1358 MODULE_PARM_DESC(debug, "Debug enabled or not");