drivers/usb/serial/usb-serial.c

   1 /*
   2  * USB Serial Converter driver
   3  *
   4  * Copyright (C) 1999 - 2012 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 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
  21
  22 #include <linux/kernel.h>
  23 #include <linux/errno.h>
  24 #include <linux/init.h>
  25 #include <linux/slab.h>
  26 #include <linux/tty.h>
  27 #include <linux/tty_driver.h>
  28 #include <linux/tty_flip.h>
  29 #include <linux/module.h>
  30 #include <linux/moduleparam.h>
  31 #include <linux/seq_file.h>
  32 #include <linux/spinlock.h>
  33 #include <linux/mutex.h>
  34 #include <linux/list.h>
  35 #include <linux/uaccess.h>
  36 #include <linux/serial.h>
  37 #include <linux/usb.h>
  38 #include <linux/usb/serial.h>
  39 #include <linux/kfifo.h>
  40 #include "pl2303.h"
  41
  42 #define DRIVER_AUTHOR "Greg Kroah-Hartman <gregkh@linuxfoundation.org>"
  43 #define DRIVER_DESC "USB Serial Driver core"
  44
  45 /* There is no MODULE_DEVICE_TABLE for usbserial.c.  Instead
  46    the MODULE_DEVICE_TABLE declarations in each serial driver
  47    cause the "hotplug" program to pull in whatever module is necessary
  48    via modprobe, and modprobe will load usbserial because the serial
  49    drivers depend on it.
  50 */
  51
  52 /* initially all NULL */
  53 static struct usb_serial *serial_table[SERIAL_TTY_MINORS];
  54 static DEFINE_MUTEX(table_lock);
  55 static LIST_HEAD(usb_serial_driver_list);
  56
  57 /*
  58  * Look up the serial structure.  If it is found and it hasn't been
  59  * disconnected, return with its disc_mutex held and its refcount
  60  * incremented.  Otherwise return NULL.
  61  */
  62 struct usb_serial *usb_serial_get_by_index(unsigned index)
  63 {
  64         struct usb_serial *serial;
  65
  66         mutex_lock(&table_lock);
  67         serial = serial_table[index];
  68
  69         if (serial) {
  70                 mutex_lock(&serial->disc_mutex);
  71                 if (serial->disconnected) {
  72                         mutex_unlock(&serial->disc_mutex);
  73                         serial = NULL;
  74                 } else {
  75                         kref_get(&serial->kref);
  76                 }
  77         }
  78         mutex_unlock(&table_lock);
  79         return serial;
  80 }
  81
  82 static struct usb_serial *get_free_serial(struct usb_serial *serial,
  83                                         int num_ports, unsigned int *minor)
  84 {
  85         unsigned int i, j;
  86         int good_spot;
  87
  88         dev_dbg(&serial->interface->dev, "%s %d\n", __func__, num_ports);
  89
  90         *minor = 0;
  91         mutex_lock(&table_lock);
  92         for (i = 0; i < SERIAL_TTY_MINORS; ++i) {
  93                 if (serial_table[i])
  94                         continue;
  95
  96                 good_spot = 1;
  97                 for (j = 1; j <= num_ports-1; ++j)
  98                         if ((i+j >= SERIAL_TTY_MINORS) || (serial_table[i+j])) {
  99                                 good_spot = 0;
 100                                 i += j;
 101                                 break;
 102                         }
 103                 if (good_spot == 0)
 104                         continue;
 105
 106                 *minor = i;
 107                 j = 0;
 108                 dev_dbg(&serial->interface->dev, "%s - minor base = %d\n", __func__, *minor);
 109                 for (i = *minor; (i < (*minor + num_ports)) && (i < SERIAL_TTY_MINORS); ++i) {
 110                         serial_table[i] = serial;
 111                         serial->port[j++]->number = i;
 112                 }
 113                 mutex_unlock(&table_lock);
 114                 return serial;
 115         }
 116         mutex_unlock(&table_lock);
 117         return NULL;
 118 }
 119
 120 static void return_serial(struct usb_serial *serial)
 121 {
 122         int i;
 123
 124         mutex_lock(&table_lock);
 125         for (i = 0; i < serial->num_ports; ++i)
 126                 serial_table[serial->minor + i] = NULL;
 127         mutex_unlock(&table_lock);
 128 }
 129
 130 static void destroy_serial(struct kref *kref)
 131 {
 132         struct usb_serial *serial;
 133         struct usb_serial_port *port;
 134         int i;
 135
 136         serial = to_usb_serial(kref);
 137
 138         /* return the minor range that this device had */
 139         if (serial->minor != SERIAL_TTY_NO_MINOR)
 140                 return_serial(serial);
 141
 142         if (serial->attached)
 143                 serial->type->release(serial);
 144
 145         /* Now that nothing is using the ports, they can be freed */
 146         for (i = 0; i < serial->num_port_pointers; ++i) {
 147                 port = serial->port[i];
 148                 if (port) {
 149                         port->serial = NULL;
 150                         put_device(&port->dev);
 151                 }
 152         }
 153
 154         usb_put_dev(serial->dev);
 155         kfree(serial);
 156 }
 157
 158 void usb_serial_put(struct usb_serial *serial)
 159 {
 160         kref_put(&serial->kref, destroy_serial);
 161 }
 162
 163 /*****************************************************************************
 164  * Driver tty interface functions
 165  *****************************************************************************/
 166
 167 /**
 168  * serial_install - install tty
 169  * @driver: the driver (USB in our case)
 170  * @tty: the tty being created
 171  *
 172  * Create the termios objects for this tty.  We use the default
 173  * USB serial settings but permit them to be overridden by
 174  * serial->type->init_termios.
 175  *
 176  * This is the first place a new tty gets used.  Hence this is where we
 177  * acquire references to the usb_serial structure and the driver module,
 178  * where we store a pointer to the port, and where we do an autoresume.
 179  * All these actions are reversed in serial_cleanup().
 180  */
 181 static int serial_install(struct tty_driver *driver, struct tty_struct *tty)
 182 {
 183         int idx = tty->index;
 184         struct usb_serial *serial;
 185         struct usb_serial_port *port;
 186         int retval = -ENODEV;
 187
 188         serial = usb_serial_get_by_index(idx);
 189         if (!serial)
 190                 return retval;
 191
 192         port = serial->port[idx - serial->minor];
 193         if (!port)
 194                 goto error_no_port;
 195         if (!try_module_get(serial->type->driver.owner))
 196                 goto error_module_get;
 197
 198         retval = usb_autopm_get_interface(serial->interface);
 199         if (retval)
 200                 goto error_get_interface;
 201
 202         retval = tty_standard_install(driver, tty);
 203         if (retval)
 204                 goto error_init_termios;
 205
 206         mutex_unlock(&serial->disc_mutex);
 207
 208         /* allow the driver to update the settings */
 209         if (serial->type->init_termios)
 210                 serial->type->init_termios(tty);
 211
 212         tty->driver_data = port;
 213
 214         return retval;
 215
 216  error_init_termios:
 217         usb_autopm_put_interface(serial->interface);
 218  error_get_interface:
 219         module_put(serial->type->driver.owner);
 220  error_module_get:
 221  error_no_port:
 222         usb_serial_put(serial);
 223         mutex_unlock(&serial->disc_mutex);
 224         return retval;
 225 }
 226
 227 static int serial_activate(struct tty_port *tport, struct tty_struct *tty)
 228 {
 229         struct usb_serial_port *port =
 230                 container_of(tport, struct usb_serial_port, port);
 231         struct usb_serial *serial = port->serial;
 232         int retval;
 233
 234         mutex_lock(&serial->disc_mutex);
 235         if (serial->disconnected)
 236                 retval = -ENODEV;
 237         else
 238                 retval = port->serial->type->open(tty, port);
 239         mutex_unlock(&serial->disc_mutex);
 240
 241         if (retval < 0)
 242                 retval = usb_translate_errors(retval);
 243
 244         return retval;
 245 }
 246
 247 static int serial_open(struct tty_struct *tty, struct file *filp)
 248 {
 249         struct usb_serial_port *port = tty->driver_data;
 250
 251         dev_dbg(tty->dev, "%s - port %d\n", __func__, port->number);
 252         return tty_port_open(&port->port, tty, filp);
 253 }
 254
 255 /**
 256  * serial_down - shut down hardware
 257  * @tport: tty port to shut down
 258  *
 259  * Shut down a USB serial port unless it is the console.  We never
 260  * shut down the console hardware as it will always be in use. Serialized
 261  * against activate by the tport mutex and kept to matching open/close pairs
 262  * of calls by the ASYNCB_INITIALIZED flag.
 263  */
 264 static void serial_down(struct tty_port *tport)
 265 {
 266         struct usb_serial_port *port =
 267                 container_of(tport, struct usb_serial_port, port);
 268         struct usb_serial_driver *drv = port->serial->type;
 269         /*
 270          * The console is magical.  Do not hang up the console hardware
 271          * or there will be tears.
 272          */
 273         if (port->port.console)
 274                 return;
 275         if (drv->close)
 276                 drv->close(port);
 277 }
 278
 279 static void serial_hangup(struct tty_struct *tty)
 280 {
 281         struct usb_serial_port *port = tty->driver_data;
 282
 283         dev_dbg(tty->dev, "%s - port %d\n", __func__, port->number);
 284         tty_port_hangup(&port->port);
 285 }
 286
 287 static void serial_close(struct tty_struct *tty, struct file *filp)
 288 {
 289         struct usb_serial_port *port = tty->driver_data;
 290
 291         dev_dbg(tty->dev, "%s - port %d\n", __func__, port->number);
 292         tty_port_close(&port->port, tty, filp);
 293 }
 294
 295 /**
 296  * serial_cleanup - free resources post close/hangup
 297  * @port: port to free up
 298  *
 299  * Do the resource freeing and refcount dropping for the port.
 300  * Avoid freeing the console.
 301  *
 302  * Called asynchronously after the last tty kref is dropped,
 303  * and the tty layer has already done the tty_shutdown(tty);
 304  */
 305 static void serial_cleanup(struct tty_struct *tty)
 306 {
 307         struct usb_serial_port *port = tty->driver_data;
 308         struct usb_serial *serial;
 309         struct module *owner;
 310
 311         /* The console is magical.  Do not hang up the console hardware
 312          * or there will be tears.
 313          */
 314         if (port->port.console)
 315                 return;
 316
 317         dev_dbg(tty->dev, "%s - port %d\n", __func__, port->number);
 318
 319         tty->driver_data = NULL;
 320
 321         serial = port->serial;
 322         owner = serial->type->driver.owner;
 323
 324         mutex_lock(&serial->disc_mutex);
 325         if (!serial->disconnected)
 326                 usb_autopm_put_interface(serial->interface);
 327         mutex_unlock(&serial->disc_mutex);
 328
 329         usb_serial_put(serial);
 330         module_put(owner);
 331 }
 332
 333 static int serial_write(struct tty_struct *tty, const unsigned char *buf,
 334                                                                 int count)
 335 {
 336         struct usb_serial_port *port = tty->driver_data;
 337         int retval = -ENODEV;
 338
 339         if (port->serial->dev->state == USB_STATE_NOTATTACHED)
 340                 goto exit;
 341
 342         dev_dbg(tty->dev, "%s - port %d, %d byte(s)\n", __func__,
 343                 port->number, count);
 344
 345         /* pass on to the driver specific version of this function */
 346         retval = port->serial->type->write(tty, port, buf, count);
 347         if (retval < 0)
 348                 retval = usb_translate_errors(retval);
 349 exit:
 350         return retval;
 351 }
 352
 353 static int serial_write_room(struct tty_struct *tty)
 354 {
 355         struct usb_serial_port *port = tty->driver_data;
 356
 357         dev_dbg(tty->dev, "%s - port %d\n", __func__, port->number);
 358         /* pass on to the driver specific version of this function */
 359         return port->serial->type->write_room(tty);
 360 }
 361
 362 static int serial_chars_in_buffer(struct tty_struct *tty)
 363 {
 364         struct usb_serial_port *port = tty->driver_data;
 365
 366         dev_dbg(tty->dev, "%s - port %d\n", __func__, port->number);
 367
 368         /* if the device was unplugged then any remaining characters
 369            fell out of the connector ;) */
 370         if (port->serial->disconnected)
 371                 return 0;
 372         /* pass on to the driver specific version of this function */
 373         return port->serial->type->chars_in_buffer(tty);
 374 }
 375
 376 static void serial_throttle(struct tty_struct *tty)
 377 {
 378         struct usb_serial_port *port = tty->driver_data;
 379
 380         dev_dbg(tty->dev, "%s - port %d\n", __func__, port->number);
 381
 382         /* pass on to the driver specific version of this function */
 383         if (port->serial->type->throttle)
 384                 port->serial->type->throttle(tty);
 385 }
 386
 387 static void serial_unthrottle(struct tty_struct *tty)
 388 {
 389         struct usb_serial_port *port = tty->driver_data;
 390
 391         dev_dbg(tty->dev, "%s - port %d\n", __func__, port->number);
 392
 393         /* pass on to the driver specific version of this function */
 394         if (port->serial->type->unthrottle)
 395                 port->serial->type->unthrottle(tty);
 396 }
 397
 398 static int serial_ioctl(struct tty_struct *tty,
 399                                         unsigned int cmd, unsigned long arg)
 400 {
 401         struct usb_serial_port *port = tty->driver_data;
 402         int retval = -ENODEV;
 403
 404         dev_dbg(tty->dev, "%s - port %d, cmd 0x%.4x\n", __func__,
 405                 port->number, cmd);
 406
 407         /* pass on to the driver specific version of this function
 408            if it is available */
 409         if (port->serial->type->ioctl) {
 410                 retval = port->serial->type->ioctl(tty, cmd, arg);
 411         } else
 412                 retval = -ENOIOCTLCMD;
 413         return retval;
 414 }
 415
 416 static void serial_set_termios(struct tty_struct *tty, struct ktermios *old)
 417 {
 418         struct usb_serial_port *port = tty->driver_data;
 419
 420         dev_dbg(tty->dev, "%s - port %d\n", __func__, port->number);
 421
 422         /* pass on to the driver specific version of this function
 423            if it is available */
 424         if (port->serial->type->set_termios)
 425                 port->serial->type->set_termios(tty, port, old);
 426         else
 427                 tty_termios_copy_hw(tty->termios, old);
 428 }
 429
 430 static int serial_break(struct tty_struct *tty, int break_state)
 431 {
 432         struct usb_serial_port *port = tty->driver_data;
 433
 434         dev_dbg(tty->dev, "%s - port %d\n", __func__, port->number);
 435
 436         /* pass on to the driver specific version of this function
 437            if it is available */
 438         if (port->serial->type->break_ctl)
 439                 port->serial->type->break_ctl(tty, break_state);
 440         return 0;
 441 }
 442
 443 static int serial_proc_show(struct seq_file *m, void *v)
 444 {
 445         struct usb_serial *serial;
 446         int i;
 447         char tmp[40];
 448
 449         seq_puts(m, "usbserinfo:1.0 driver:2.0\n");
 450         for (i = 0; i < SERIAL_TTY_MINORS; ++i) {
 451                 serial = usb_serial_get_by_index(i);
 452                 if (serial == NULL)
 453                         continue;
 454
 455                 seq_printf(m, "%d:", i);
 456                 if (serial->type->driver.owner)
 457                         seq_printf(m, " module:%s",
 458                                 module_name(serial->type->driver.owner));
 459                 seq_printf(m, " name:\"%s\"",
 460                                 serial->type->description);
 461                 seq_printf(m, " vendor:%04x product:%04x",
 462                         le16_to_cpu(serial->dev->descriptor.idVendor),
 463                         le16_to_cpu(serial->dev->descriptor.idProduct));
 464                 seq_printf(m, " num_ports:%d", serial->num_ports);
 465                 seq_printf(m, " port:%d", i - serial->minor + 1);
 466                 usb_make_path(serial->dev, tmp, sizeof(tmp));
 467                 seq_printf(m, " path:%s", tmp);
 468
 469                 seq_putc(m, '\n');
 470                 usb_serial_put(serial);
 471                 mutex_unlock(&serial->disc_mutex);
 472         }
 473         return 0;
 474 }
 475
 476 static int serial_proc_open(struct inode *inode, struct file *file)
 477 {
 478         return single_open(file, serial_proc_show, NULL);
 479 }
 480
 481 static const struct file_operations serial_proc_fops = {
 482         .owner          = THIS_MODULE,
 483         .open           = serial_proc_open,
 484         .read           = seq_read,
 485         .llseek         = seq_lseek,
 486         .release        = single_release,
 487 };
 488
 489 static int serial_tiocmget(struct tty_struct *tty)
 490 {
 491         struct usb_serial_port *port = tty->driver_data;
 492
 493         dev_dbg(tty->dev, "%s - port %d\n", __func__, port->number);
 494
 495         if (port->serial->type->tiocmget)
 496                 return port->serial->type->tiocmget(tty);
 497         return -EINVAL;
 498 }
 499
 500 static int serial_tiocmset(struct tty_struct *tty,
 501                             unsigned int set, unsigned int clear)
 502 {
 503         struct usb_serial_port *port = tty->driver_data;
 504
 505         dev_dbg(tty->dev, "%s - port %d\n", __func__, port->number);
 506
 507         if (port->serial->type->tiocmset)
 508                 return port->serial->type->tiocmset(tty, set, clear);
 509         return -EINVAL;
 510 }
 511
 512 static int serial_get_icount(struct tty_struct *tty,
 513                                 struct serial_icounter_struct *icount)
 514 {
 515         struct usb_serial_port *port = tty->driver_data;
 516
 517         dev_dbg(tty->dev, "%s - port %d\n", __func__, port->number);
 518
 519         if (port->serial->type->get_icount)
 520                 return port->serial->type->get_icount(tty, icount);
 521         return -EINVAL;
 522 }
 523
 524 /*
 525  * We would be calling tty_wakeup here, but unfortunately some line
 526  * disciplines have an annoying habit of calling tty->write from
 527  * the write wakeup callback (e.g. n_hdlc.c).
 528  */
 529 void usb_serial_port_softint(struct usb_serial_port *port)
 530 {
 531         schedule_work(&port->work);
 532 }
 533 EXPORT_SYMBOL_GPL(usb_serial_port_softint);
 534
 535 static void usb_serial_port_work(struct work_struct *work)
 536 {
 537         struct usb_serial_port *port =
 538                 container_of(work, struct usb_serial_port, work);
 539         struct tty_struct *tty;
 540
 541         tty = tty_port_tty_get(&port->port);
 542         if (!tty)
 543                 return;
 544
 545         dev_dbg(tty->dev, "%s - port %d\n", __func__, port->number);
 546
 547         tty_wakeup(tty);
 548         tty_kref_put(tty);
 549 }
 550
 551 static void kill_traffic(struct usb_serial_port *port)
 552 {
 553         int i;
 554
 555         for (i = 0; i < ARRAY_SIZE(port->read_urbs); ++i)
 556                 usb_kill_urb(port->read_urbs[i]);
 557         for (i = 0; i < ARRAY_SIZE(port->write_urbs); ++i)
 558                 usb_kill_urb(port->write_urbs[i]);
 559         /*
 560          * This is tricky.
 561          * Some drivers submit the read_urb in the
 562          * handler for the write_urb or vice versa
 563          * this order determines the order in which
 564          * usb_kill_urb() must be used to reliably
 565          * kill the URBs. As it is unknown here,
 566          * both orders must be used in turn.
 567          * The call below is not redundant.
 568          */
 569         usb_kill_urb(port->read_urb);
 570         usb_kill_urb(port->interrupt_in_urb);
 571         usb_kill_urb(port->interrupt_out_urb);
 572 }
 573
 574 static void port_release(struct device *dev)
 575 {
 576         struct usb_serial_port *port = to_usb_serial_port(dev);
 577         int i;
 578
 579         dev_dbg(dev, "%s\n", __func__);
 580
 581         /*
 582          * Stop all the traffic before cancelling the work, so that
 583          * nobody will restart it by calling usb_serial_port_softint.
 584          */
 585         kill_traffic(port);
 586         cancel_work_sync(&port->work);
 587
 588         usb_free_urb(port->interrupt_in_urb);
 589         usb_free_urb(port->interrupt_out_urb);
 590         for (i = 0; i < ARRAY_SIZE(port->read_urbs); ++i) {
 591                 usb_free_urb(port->read_urbs[i]);
 592                 kfree(port->bulk_in_buffers[i]);
 593         }
 594         for (i = 0; i < ARRAY_SIZE(port->write_urbs); ++i) {
 595                 usb_free_urb(port->write_urbs[i]);
 596                 kfree(port->bulk_out_buffers[i]);
 597         }
 598         kfifo_free(&port->write_fifo);
 599         kfree(port->interrupt_in_buffer);
 600         kfree(port->interrupt_out_buffer);
 601         kfree(port);
 602 }
 603
 604 static struct usb_serial *create_serial(struct usb_device *dev,
 605                                         struct usb_interface *interface,
 606                                         struct usb_serial_driver *driver)
 607 {
 608         struct usb_serial *serial;
 609
 610         serial = kzalloc(sizeof(*serial), GFP_KERNEL);
 611         if (!serial) {
 612                 dev_err(&dev->dev, "%s - out of memory\n", __func__);
 613                 return NULL;
 614         }
 615         serial->dev = usb_get_dev(dev);
 616         serial->type = driver;
 617         serial->interface = interface;
 618         kref_init(&serial->kref);
 619         mutex_init(&serial->disc_mutex);
 620         serial->minor = SERIAL_TTY_NO_MINOR;
 621
 622         return serial;
 623 }
 624
 625 static const struct usb_device_id *match_dynamic_id(struct usb_interface *intf,
 626                                             struct usb_serial_driver *drv)
 627 {
 628         struct usb_dynid *dynid;
 629
 630         spin_lock(&drv->dynids.lock);
 631         list_for_each_entry(dynid, &drv->dynids.list, node) {
 632                 if (usb_match_one_id(intf, &dynid->id)) {
 633                         spin_unlock(&drv->dynids.lock);
 634                         return &dynid->id;
 635                 }
 636         }
 637         spin_unlock(&drv->dynids.lock);
 638         return NULL;
 639 }
 640
 641 static const struct usb_device_id *get_iface_id(struct usb_serial_driver *drv,
 642                                                 struct usb_interface *intf)
 643 {
 644         const struct usb_device_id *id;
 645
 646         id = usb_match_id(intf, drv->id_table);
 647         if (id) {
 648                 dev_dbg(&intf->dev, "static descriptor matches\n");
 649                 goto exit;
 650         }
 651         id = match_dynamic_id(intf, drv);
 652         if (id)
 653                 dev_dbg(&intf->dev, "dynamic descriptor matches\n");
 654 exit:
 655         return id;
 656 }
 657
 658 /* Caller must hold table_lock */
 659 static struct usb_serial_driver *search_serial_device(
 660                                         struct usb_interface *iface)
 661 {
 662         const struct usb_device_id *id = NULL;
 663         struct usb_serial_driver *drv;
 664         struct usb_driver *driver = to_usb_driver(iface->dev.driver);
 665
 666         /* Check if the usb id matches a known device */
 667         list_for_each_entry(drv, &usb_serial_driver_list, driver_list) {
 668                 if (drv->usb_driver == driver)
 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
 682         if (drv->carrier_raised)
 683                 return drv->carrier_raised(p);
 684         /* No carrier control - don't block */
 685         return 1;
 686 }
 687
 688 static void serial_dtr_rts(struct tty_port *port, int on)
 689 {
 690         struct usb_serial_port *p = container_of(port, struct usb_serial_port, port);
 691         struct usb_serial_driver *drv = p->serial->type;
 692
 693         if (drv->dtr_rts)
 694                 drv->dtr_rts(p, on);
 695 }
 696
 697 static const struct tty_port_operations serial_port_ops = {
 698         .carrier_raised = serial_carrier_raised,
 699         .dtr_rts = serial_dtr_rts,
 700         .activate = serial_activate,
 701         .shutdown = serial_down,
 702 };
 703
 704 static int usb_serial_probe(struct usb_interface *interface,
 705                                const struct usb_device_id *id)
 706 {
 707         struct device *ddev = &interface->dev;
 708         struct usb_device *dev = interface_to_usbdev(interface);
 709         struct usb_serial *serial = NULL;
 710         struct usb_serial_port *port;
 711         struct usb_host_interface *iface_desc;
 712         struct usb_endpoint_descriptor *endpoint;
 713         struct usb_endpoint_descriptor *interrupt_in_endpoint[MAX_NUM_PORTS];
 714         struct usb_endpoint_descriptor *interrupt_out_endpoint[MAX_NUM_PORTS];
 715         struct usb_endpoint_descriptor *bulk_in_endpoint[MAX_NUM_PORTS];
 716         struct usb_endpoint_descriptor *bulk_out_endpoint[MAX_NUM_PORTS];
 717         struct usb_serial_driver *type = NULL;
 718         int retval;
 719         unsigned int minor;
 720         int buffer_size;
 721         int i;
 722         int j;
 723         int num_interrupt_in = 0;
 724         int num_interrupt_out = 0;
 725         int num_bulk_in = 0;
 726         int num_bulk_out = 0;
 727         int num_ports = 0;
 728         int max_endpoints;
 729
 730         mutex_lock(&table_lock);
 731         type = search_serial_device(interface);
 732         if (!type) {
 733                 mutex_unlock(&table_lock);
 734                 dev_dbg(ddev, "none matched\n");
 735                 return -ENODEV;
 736         }
 737
 738         if (!try_module_get(type->driver.owner)) {
 739                 mutex_unlock(&table_lock);
 740                 dev_err(ddev, "module get failed, exiting\n");
 741                 return -EIO;
 742         }
 743         mutex_unlock(&table_lock);
 744
 745         serial = create_serial(dev, interface, type);
 746         if (!serial) {
 747                 module_put(type->driver.owner);
 748                 dev_err(ddev, "%s - out of memory\n", __func__);
 749                 return -ENOMEM;
 750         }
 751
 752         /* if this device type has a probe function, call it */
 753         if (type->probe) {
 754                 const struct usb_device_id *id;
 755
 756                 id = get_iface_id(type, interface);
 757                 retval = type->probe(serial, id);
 758
 759                 if (retval) {
 760                         dev_dbg(ddev, "sub driver rejected device\n");
 761                         usb_serial_put(serial);
 762                         module_put(type->driver.owner);
 763                         return retval;
 764                 }
 765         }
 766
 767         /* descriptor matches, let's find the endpoints needed */
 768         /* check out the endpoints */
 769         iface_desc = interface->cur_altsetting;
 770         for (i = 0; i < iface_desc->desc.bNumEndpoints; ++i) {
 771                 endpoint = &iface_desc->endpoint[i].desc;
 772
 773                 if (usb_endpoint_is_bulk_in(endpoint)) {
 774                         /* we found a bulk in endpoint */
 775                         dev_dbg(ddev, "found bulk in on endpoint %d\n", i);
 776                         bulk_in_endpoint[num_bulk_in] = endpoint;
 777                         ++num_bulk_in;
 778                 }
 779
 780                 if (usb_endpoint_is_bulk_out(endpoint)) {
 781                         /* we found a bulk out endpoint */
 782                         dev_dbg(ddev, "found bulk out on endpoint %d\n", i);
 783                         bulk_out_endpoint[num_bulk_out] = endpoint;
 784                         ++num_bulk_out;
 785                 }
 786
 787                 if (usb_endpoint_is_int_in(endpoint)) {
 788                         /* we found a interrupt in endpoint */
 789                         dev_dbg(ddev, "found interrupt in on endpoint %d\n", i);
 790                         interrupt_in_endpoint[num_interrupt_in] = endpoint;
 791                         ++num_interrupt_in;
 792                 }
 793
 794                 if (usb_endpoint_is_int_out(endpoint)) {
 795                         /* we found an interrupt out endpoint */
 796                         dev_dbg(ddev, "found interrupt out on endpoint %d\n", i);
 797                         interrupt_out_endpoint[num_interrupt_out] = endpoint;
 798                         ++num_interrupt_out;
 799                 }
 800         }
 801
 802 #if defined(CONFIG_USB_SERIAL_PL2303) || defined(CONFIG_USB_SERIAL_PL2303_MODULE)
 803         /* BEGIN HORRIBLE HACK FOR PL2303 */
 804         /* this is needed due to the looney way its endpoints are set up */
 805         if (((le16_to_cpu(dev->descriptor.idVendor) == PL2303_VENDOR_ID) &&
 806              (le16_to_cpu(dev->descriptor.idProduct) == PL2303_PRODUCT_ID)) ||
 807             ((le16_to_cpu(dev->descriptor.idVendor) == ATEN_VENDOR_ID) &&
 808              (le16_to_cpu(dev->descriptor.idProduct) == ATEN_PRODUCT_ID)) ||
 809             ((le16_to_cpu(dev->descriptor.idVendor) == ALCOR_VENDOR_ID) &&
 810              (le16_to_cpu(dev->descriptor.idProduct) == ALCOR_PRODUCT_ID)) ||
 811             ((le16_to_cpu(dev->descriptor.idVendor) == SIEMENS_VENDOR_ID) &&
 812              (le16_to_cpu(dev->descriptor.idProduct) == SIEMENS_PRODUCT_ID_EF81))) {
 813                 if (interface != dev->actconfig->interface[0]) {
 814                         /* check out the endpoints of the other interface*/
 815                         iface_desc = dev->actconfig->interface[0]->cur_altsetting;
 816                         for (i = 0; i < iface_desc->desc.bNumEndpoints; ++i) {
 817                                 endpoint = &iface_desc->endpoint[i].desc;
 818                                 if (usb_endpoint_is_int_in(endpoint)) {
 819                                         /* we found a interrupt in endpoint */
 820                                         dev_dbg(ddev, "found interrupt in for Prolific device on separate interface\n");
 821                                         interrupt_in_endpoint[num_interrupt_in] = endpoint;
 822                                         ++num_interrupt_in;
 823                                 }
 824                         }
 825                 }
 826
 827                 /* Now make sure the PL-2303 is configured correctly.
 828                  * If not, give up now and hope this hack will work
 829                  * properly during a later invocation of usb_serial_probe
 830                  */
 831                 if (num_bulk_in == 0 || num_bulk_out == 0) {
 832                         dev_info(ddev, "PL-2303 hack: descriptors matched but endpoints did not\n");
 833                         usb_serial_put(serial);
 834                         module_put(type->driver.owner);
 835                         return -ENODEV;
 836                 }
 837         }
 838         /* END HORRIBLE HACK FOR PL2303 */
 839 #endif
 840
 841 #ifdef CONFIG_USB_SERIAL_GENERIC
 842         if (type == &usb_serial_generic_device) {
 843                 num_ports = num_bulk_out;
 844                 if (num_ports == 0) {
 845                         dev_err(ddev, "Generic device with no bulk out, not allowed.\n");
 846                         usb_serial_put(serial);
 847                         module_put(type->driver.owner);
 848                         return -EIO;
 849                 }
 850                 dev_info(ddev, "The \"generic\" usb-serial driver is only for testing and one-off prototypes.\n");
 851                 dev_info(ddev, "Tell linux-usb@vger.kernel.org to add your device to a proper driver.\n");
 852         }
 853 #endif
 854         if (!num_ports) {
 855                 /* if this device type has a calc_num_ports function, call it */
 856                 if (type->calc_num_ports)
 857                         num_ports = type->calc_num_ports(serial);
 858                 if (!num_ports)
 859                         num_ports = type->num_ports;
 860         }
 861
 862         serial->num_ports = num_ports;
 863         serial->num_bulk_in = num_bulk_in;
 864         serial->num_bulk_out = num_bulk_out;
 865         serial->num_interrupt_in = num_interrupt_in;
 866         serial->num_interrupt_out = num_interrupt_out;
 867
 868         /* found all that we need */
 869         dev_info(ddev, "%s converter detected\n", type->description);
 870
 871         /* create our ports, we need as many as the max endpoints */
 872         /* we don't use num_ports here because some devices have more
 873            endpoint pairs than ports */
 874         max_endpoints = max(num_bulk_in, num_bulk_out);
 875         max_endpoints = max(max_endpoints, num_interrupt_in);
 876         max_endpoints = max(max_endpoints, num_interrupt_out);
 877         max_endpoints = max(max_endpoints, (int)serial->num_ports);
 878         serial->num_port_pointers = max_endpoints;
 879
 880         dev_dbg(ddev, "setting up %d port structures for this device", max_endpoints);
 881         for (i = 0; i < max_endpoints; ++i) {
 882                 port = kzalloc(sizeof(struct usb_serial_port), GFP_KERNEL);
 883                 if (!port)
 884                         goto probe_error;
 885                 tty_port_init(&port->port);
 886                 port->port.ops = &serial_port_ops;
 887                 port->serial = serial;
 888                 spin_lock_init(&port->lock);
 889                 /* Keep this for private driver use for the moment but
 890                    should probably go away */
 891                 INIT_WORK(&port->work, usb_serial_port_work);
 892                 serial->port[i] = port;
 893                 port->dev.parent = &interface->dev;
 894                 port->dev.driver = NULL;
 895                 port->dev.bus = &usb_serial_bus_type;
 896                 port->dev.release = &port_release;
 897                 device_initialize(&port->dev);
 898         }
 899
 900         /* set up the endpoint information */
 901         for (i = 0; i < num_bulk_in; ++i) {
 902                 endpoint = bulk_in_endpoint[i];
 903                 port = serial->port[i];
 904                 buffer_size = max_t(int, serial->type->bulk_in_size,
 905                                 usb_endpoint_maxp(endpoint));
 906                 port->bulk_in_size = buffer_size;
 907                 port->bulk_in_endpointAddress = endpoint->bEndpointAddress;
 908
 909                 for (j = 0; j < ARRAY_SIZE(port->read_urbs); ++j) {
 910                         set_bit(j, &port->read_urbs_free);
 911                         port->read_urbs[j] = usb_alloc_urb(0, GFP_KERNEL);
 912                         if (!port->read_urbs[j]) {
 913                                 dev_err(ddev, "No free urbs available\n");
 914                                 goto probe_error;
 915                         }
 916                         port->bulk_in_buffers[j] = kmalloc(buffer_size,
 917                                                                 GFP_KERNEL);
 918                         if (!port->bulk_in_buffers[j]) {
 919                                 dev_err(ddev, "Couldn't allocate bulk_in_buffer\n");
 920                                 goto probe_error;
 921                         }
 922                         usb_fill_bulk_urb(port->read_urbs[j], dev,
 923                                         usb_rcvbulkpipe(dev,
 924                                                 endpoint->bEndpointAddress),
 925                                         port->bulk_in_buffers[j], buffer_size,
 926                                         serial->type->read_bulk_callback,
 927                                         port);
 928                 }
 929
 930                 port->read_urb = port->read_urbs[0];
 931                 port->bulk_in_buffer = port->bulk_in_buffers[0];
 932         }
 933
 934         for (i = 0; i < num_bulk_out; ++i) {
 935                 endpoint = bulk_out_endpoint[i];
 936                 port = serial->port[i];
 937                 if (kfifo_alloc(&port->write_fifo, PAGE_SIZE, GFP_KERNEL))
 938                         goto probe_error;
 939                 buffer_size = serial->type->bulk_out_size;
 940                 if (!buffer_size)
 941                         buffer_size = usb_endpoint_maxp(endpoint);
 942                 port->bulk_out_size = buffer_size;
 943                 port->bulk_out_endpointAddress = endpoint->bEndpointAddress;
 944
 945                 for (j = 0; j < ARRAY_SIZE(port->write_urbs); ++j) {
 946                         set_bit(j, &port->write_urbs_free);
 947                         port->write_urbs[j] = usb_alloc_urb(0, GFP_KERNEL);
 948                         if (!port->write_urbs[j]) {
 949                                 dev_err(ddev, "No free urbs available\n");
 950                                 goto probe_error;
 951                         }
 952                         port->bulk_out_buffers[j] = kmalloc(buffer_size,
 953                                                                 GFP_KERNEL);
 954                         if (!port->bulk_out_buffers[j]) {
 955                                 dev_err(ddev, "Couldn't allocate bulk_out_buffer\n");
 956                                 goto probe_error;
 957                         }
 958                         usb_fill_bulk_urb(port->write_urbs[j], dev,
 959                                         usb_sndbulkpipe(dev,
 960                                                 endpoint->bEndpointAddress),
 961                                         port->bulk_out_buffers[j], buffer_size,
 962                                         serial->type->write_bulk_callback,
 963                                         port);
 964                 }
 965
 966                 port->write_urb = port->write_urbs[0];
 967                 port->bulk_out_buffer = port->bulk_out_buffers[0];
 968         }
 969
 970         if (serial->type->read_int_callback) {
 971                 for (i = 0; i < num_interrupt_in; ++i) {
 972                         endpoint = interrupt_in_endpoint[i];
 973                         port = serial->port[i];
 974                         port->interrupt_in_urb = usb_alloc_urb(0, GFP_KERNEL);
 975                         if (!port->interrupt_in_urb) {
 976                                 dev_err(ddev, "No free urbs available\n");
 977                                 goto probe_error;
 978                         }
 979                         buffer_size = usb_endpoint_maxp(endpoint);
 980                         port->interrupt_in_endpointAddress =
 981                                                 endpoint->bEndpointAddress;
 982                         port->interrupt_in_buffer = kmalloc(buffer_size,
 983                                                                 GFP_KERNEL);
 984                         if (!port->interrupt_in_buffer) {
 985                                 dev_err(ddev, "Couldn't allocate interrupt_in_buffer\n");
 986                                 goto probe_error;
 987                         }
 988                         usb_fill_int_urb(port->interrupt_in_urb, dev,
 989                                 usb_rcvintpipe(dev,
 990                                                 endpoint->bEndpointAddress),
 991                                 port->interrupt_in_buffer, buffer_size,
 992                                 serial->type->read_int_callback, port,
 993                                 endpoint->bInterval);
 994                 }
 995         } else if (num_interrupt_in) {
 996                 dev_dbg(ddev, "The device claims to support interrupt in transfers, but read_int_callback is not defined\n");
 997         }
 998
 999         if (serial->type->write_int_callback) {
1000                 for (i = 0; i < num_interrupt_out; ++i) {
1001                         endpoint = interrupt_out_endpoint[i];
1002                         port = serial->port[i];
1003                         port->interrupt_out_urb = usb_alloc_urb(0, GFP_KERNEL);
1004                         if (!port->interrupt_out_urb) {
1005                                 dev_err(ddev, "No free urbs available\n");
1006                                 goto probe_error;
1007                         }
1008                         buffer_size = usb_endpoint_maxp(endpoint);
1009                         port->interrupt_out_size = buffer_size;
1010                         port->interrupt_out_endpointAddress =
1011                                                 endpoint->bEndpointAddress;
1012                         port->interrupt_out_buffer = kmalloc(buffer_size,
1013                                                                 GFP_KERNEL);
1014                         if (!port->interrupt_out_buffer) {
1015                                 dev_err(ddev, "Couldn't allocate interrupt_out_buffer\n");
1016                                 goto probe_error;
1017                         }
1018                         usb_fill_int_urb(port->interrupt_out_urb, dev,
1019                                 usb_sndintpipe(dev,
1020                                                   endpoint->bEndpointAddress),
1021                                 port->interrupt_out_buffer, buffer_size,
1022                                 serial->type->write_int_callback, port,
1023                                 endpoint->bInterval);
1024                 }
1025         } else if (num_interrupt_out) {
1026                 dev_dbg(ddev, "The device claims to support interrupt out transfers, but write_int_callback is not defined\n");
1027         }
1028
1029         usb_set_intfdata(interface, serial);
1030
1031         /* if this device type has an attach function, call it */
1032         if (type->attach) {
1033                 retval = type->attach(serial);
1034                 if (retval < 0)
1035                         goto probe_error;
1036                 serial->attached = 1;
1037                 if (retval > 0) {
1038                         /* quietly accept this device, but don't bind to a
1039                            serial port as it's about to disappear */
1040                         serial->num_ports = 0;
1041                         goto exit;
1042                 }
1043         } else {
1044                 serial->attached = 1;
1045         }
1046
1047         /* Avoid race with tty_open and serial_install by setting the
1048          * disconnected flag and not clearing it until all ports have been
1049          * registered.
1050          */
1051         serial->disconnected = 1;
1052
1053         if (get_free_serial(serial, num_ports, &minor) == NULL) {
1054                 dev_err(ddev, "No more free serial devices\n");
1055                 goto probe_error;
1056         }
1057         serial->minor = minor;
1058
1059         /* register all of the individual ports with the driver core */
1060         for (i = 0; i < num_ports; ++i) {
1061                 port = serial->port[i];
1062                 dev_set_name(&port->dev, "ttyUSB%d", port->number);
1063                 dev_dbg(ddev, "registering %s", dev_name(&port->dev));
1064                 device_enable_async_suspend(&port->dev);
1065
1066                 retval = device_add(&port->dev);
1067                 if (retval)
1068                         dev_err(ddev, "Error registering port device, continuing\n");
1069         }
1070
1071         serial->disconnected = 0;
1072
1073         usb_serial_console_init(minor);
1074 exit:
1075         module_put(type->driver.owner);
1076         return 0;
1077
1078 probe_error:
1079         usb_serial_put(serial);
1080         module_put(type->driver.owner);
1081         return -EIO;
1082 }
1083
1084 static void usb_serial_disconnect(struct usb_interface *interface)
1085 {
1086         int i;
1087         struct usb_serial *serial = usb_get_intfdata(interface);
1088         struct device *dev = &interface->dev;
1089         struct usb_serial_port *port;
1090
1091         usb_serial_console_disconnect(serial);
1092
1093         mutex_lock(&serial->disc_mutex);
1094         /* must set a flag, to signal subdrivers */
1095         serial->disconnected = 1;
1096         mutex_unlock(&serial->disc_mutex);
1097
1098         for (i = 0; i < serial->num_ports; ++i) {
1099                 port = serial->port[i];
1100                 if (port) {
1101                         struct tty_struct *tty = tty_port_tty_get(&port->port);
1102                         if (tty) {
1103                                 tty_vhangup(tty);
1104                                 tty_kref_put(tty);
1105                         }
1106                         kill_traffic(port);
1107                         cancel_work_sync(&port->work);
1108                         if (device_is_registered(&port->dev))
1109                                 device_del(&port->dev);
1110                 }
1111         }
1112         serial->type->disconnect(serial);
1113
1114         /* let the last holder of this object cause it to be cleaned up */
1115         usb_serial_put(serial);
1116         dev_info(dev, "device disconnected\n");
1117 }
1118
1119 int usb_serial_suspend(struct usb_interface *intf, pm_message_t message)
1120 {
1121         struct usb_serial *serial = usb_get_intfdata(intf);
1122         struct usb_serial_port *port;
1123         int i, r = 0;
1124
1125         serial->suspending = 1;
1126
1127         if (serial->type->suspend) {
1128                 r = serial->type->suspend(serial, message);
1129                 if (r < 0) {
1130                         serial->suspending = 0;
1131                         goto err_out;
1132                 }
1133         }
1134
1135         for (i = 0; i < serial->num_ports; ++i) {
1136                 port = serial->port[i];
1137                 if (port)
1138                         kill_traffic(port);
1139         }
1140
1141 err_out:
1142         return r;
1143 }
1144 EXPORT_SYMBOL(usb_serial_suspend);
1145
1146 int usb_serial_resume(struct usb_interface *intf)
1147 {
1148         struct usb_serial *serial = usb_get_intfdata(intf);
1149         int rv;
1150
1151         serial->suspending = 0;
1152         if (serial->type->resume)
1153                 rv = serial->type->resume(serial);
1154         else
1155                 rv = usb_serial_generic_resume(serial);
1156
1157         return rv;
1158 }
1159 EXPORT_SYMBOL(usb_serial_resume);
1160
1161 static int usb_serial_reset_resume(struct usb_interface *intf)
1162 {
1163         struct usb_serial *serial = usb_get_intfdata(intf);
1164         int rv;
1165
1166         serial->suspending = 0;
1167         if (serial->type->reset_resume)
1168                 rv = serial->type->reset_resume(serial);
1169         else {
1170                 rv = -EOPNOTSUPP;
1171                 intf->needs_binding = 1;
1172         }
1173
1174         return rv;
1175 }
1176
1177 static const struct tty_operations serial_ops = {
1178         .open =                 serial_open,
1179         .close =                serial_close,
1180         .write =                serial_write,
1181         .hangup =               serial_hangup,
1182         .write_room =           serial_write_room,
1183         .ioctl =                serial_ioctl,
1184         .set_termios =          serial_set_termios,
1185         .throttle =             serial_throttle,
1186         .unthrottle =           serial_unthrottle,
1187         .break_ctl =            serial_break,
1188         .chars_in_buffer =      serial_chars_in_buffer,
1189         .tiocmget =             serial_tiocmget,
1190         .tiocmset =             serial_tiocmset,
1191         .get_icount =           serial_get_icount,
1192         .cleanup =              serial_cleanup,
1193         .install =              serial_install,
1194         .proc_fops =            &serial_proc_fops,
1195 };
1196
1197
1198 struct tty_driver *usb_serial_tty_driver;
1199
1200 /* Driver structure we register with the USB core */
1201 static struct usb_driver usb_serial_driver = {
1202         .name =         "usbserial",
1203         .probe =        usb_serial_probe,
1204         .disconnect =   usb_serial_disconnect,
1205         .suspend =      usb_serial_suspend,
1206         .resume =       usb_serial_resume,
1207         .no_dynamic_id =        1,
1208         .supports_autosuspend = 1,
1209 };
1210
1211 static int __init usb_serial_init(void)
1212 {
1213         int i;
1214         int result;
1215
1216         usb_serial_tty_driver = alloc_tty_driver(SERIAL_TTY_MINORS);
1217         if (!usb_serial_tty_driver)
1218                 return -ENOMEM;
1219
1220         /* Initialize our global data */
1221         for (i = 0; i < SERIAL_TTY_MINORS; ++i)
1222                 serial_table[i] = NULL;
1223
1224         result = bus_register(&usb_serial_bus_type);
1225         if (result) {
1226                 pr_err("%s - registering bus driver failed\n", __func__);
1227                 goto exit_bus;
1228         }
1229
1230         usb_serial_tty_driver->driver_name = "usbserial";
1231         usb_serial_tty_driver->name = "ttyUSB";
1232         usb_serial_tty_driver->major = SERIAL_TTY_MAJOR;
1233         usb_serial_tty_driver->minor_start = 0;
1234         usb_serial_tty_driver->type = TTY_DRIVER_TYPE_SERIAL;
1235         usb_serial_tty_driver->subtype = SERIAL_TYPE_NORMAL;
1236         usb_serial_tty_driver->flags = TTY_DRIVER_REAL_RAW |
1237                                                 TTY_DRIVER_DYNAMIC_DEV;
1238         usb_serial_tty_driver->init_termios = tty_std_termios;
1239         usb_serial_tty_driver->init_termios.c_cflag = B9600 | CS8 | CREAD
1240                                                         | HUPCL | CLOCAL;
1241         usb_serial_tty_driver->init_termios.c_ispeed = 9600;
1242         usb_serial_tty_driver->init_termios.c_ospeed = 9600;
1243         tty_set_operations(usb_serial_tty_driver, &serial_ops);
1244         result = tty_register_driver(usb_serial_tty_driver);
1245         if (result) {
1246                 pr_err("%s - tty_register_driver failed\n", __func__);
1247                 goto exit_reg_driver;
1248         }
1249
1250         /* register the USB driver */
1251         result = usb_register(&usb_serial_driver);
1252         if (result < 0) {
1253                 pr_err("%s - usb_register failed\n", __func__);
1254                 goto exit_tty;
1255         }
1256
1257         /* register the generic driver, if we should */
1258         result = usb_serial_generic_register();
1259         if (result < 0) {
1260                 pr_err("%s - registering generic driver failed\n", __func__);
1261                 goto exit_generic;
1262         }
1263
1264         return result;
1265
1266 exit_generic:
1267         usb_deregister(&usb_serial_driver);
1268
1269 exit_tty:
1270         tty_unregister_driver(usb_serial_tty_driver);
1271
1272 exit_reg_driver:
1273         bus_unregister(&usb_serial_bus_type);
1274
1275 exit_bus:
1276         pr_err("%s - returning with error %d\n", __func__, result);
1277         put_tty_driver(usb_serial_tty_driver);
1278         return result;
1279 }
1280
1281
1282 static void __exit usb_serial_exit(void)
1283 {
1284         usb_serial_console_exit();
1285
1286         usb_serial_generic_deregister();
1287
1288         usb_deregister(&usb_serial_driver);
1289         tty_unregister_driver(usb_serial_tty_driver);
1290         put_tty_driver(usb_serial_tty_driver);
1291         bus_unregister(&usb_serial_bus_type);
1292 }
1293
1294
1295 module_init(usb_serial_init);
1296 module_exit(usb_serial_exit);
1297
1298 #define set_to_generic_if_null(type, function)                          \
1299         do {                                                            \
1300                 if (!type->function) {                                  \
1301                         type->function = usb_serial_generic_##function; \
1302                         pr_debug("Had to override the " #function       \
1303                                 " usb serial operation with the generic one.");\
1304                         }                                               \
1305         } while (0)
1306
1307 static void fixup_generic(struct usb_serial_driver *device)
1308 {
1309         set_to_generic_if_null(device, open);
1310         set_to_generic_if_null(device, write);
1311         set_to_generic_if_null(device, close);
1312         set_to_generic_if_null(device, write_room);
1313         set_to_generic_if_null(device, chars_in_buffer);
1314         set_to_generic_if_null(device, read_bulk_callback);
1315         set_to_generic_if_null(device, write_bulk_callback);
1316         set_to_generic_if_null(device, disconnect);
1317         set_to_generic_if_null(device, release);
1318         set_to_generic_if_null(device, process_read_urb);
1319         set_to_generic_if_null(device, prepare_write_buffer);
1320 }
1321
1322 static int usb_serial_register(struct usb_serial_driver *driver)
1323 {
1324         int retval;
1325
1326         if (usb_disabled())
1327                 return -ENODEV;
1328
1329         fixup_generic(driver);
1330
1331         if (!driver->description)
1332                 driver->description = driver->driver.name;
1333         if (!driver->usb_driver) {
1334                 WARN(1, "Serial driver %s has no usb_driver\n",
1335                                 driver->description);
1336                 return -EINVAL;
1337         }
1338
1339         /* Add this device to our list of devices */
1340         mutex_lock(&table_lock);
1341         list_add(&driver->driver_list, &usb_serial_driver_list);
1342
1343         retval = usb_serial_bus_register(driver);
1344         if (retval) {
1345                 pr_err("problem %d when registering driver %s\n", retval, driver->description);
1346                 list_del(&driver->driver_list);
1347         } else
1348                 pr_info("USB Serial support registered for %s\n", driver->description);
1349
1350         mutex_unlock(&table_lock);
1351         return retval;
1352 }
1353
1354 static void usb_serial_deregister(struct usb_serial_driver *device)
1355 {
1356         pr_info("USB Serial deregistering driver %s\n", device->description);
1357         mutex_lock(&table_lock);
1358         list_del(&device->driver_list);
1359         usb_serial_bus_deregister(device);
1360         mutex_unlock(&table_lock);
1361 }
1362
1363 /**
1364  * usb_serial_register_drivers - register drivers for a usb-serial module
1365  * @serial_drivers: NULL-terminated array of pointers to drivers to be registered
1366  * @name: name of the usb_driver for this set of @serial_drivers
1367  * @id_table: list of all devices this @serial_drivers set binds to
1368  *
1369  * Registers all the drivers in the @serial_drivers array, and dynamically
1370  * creates a struct usb_driver with the name @name and id_table of @id_table.
1371  */
1372 int usb_serial_register_drivers(struct usb_serial_driver *const serial_drivers[],
1373                                 const char *name,
1374                                 const struct usb_device_id *id_table)
1375 {
1376         int rc;
1377         struct usb_driver *udriver;
1378         struct usb_serial_driver * const *sd;
1379
1380         /*
1381          * udriver must be registered before any of the serial drivers,
1382          * because the store_new_id() routine for the serial drivers (in
1383          * bus.c) probes udriver.
1384          *
1385          * Performance hack: We don't want udriver to be probed until
1386          * the serial drivers are registered, because the probe would
1387          * simply fail for lack of a matching serial driver.
1388          * So we leave udriver's id_table set to NULL until we are all set.
1389          *
1390          * Suspend/resume support is implemented in the usb-serial core,
1391          * so fill in the PM-related fields in udriver.
1392          */
1393         udriver = kzalloc(sizeof(*udriver), GFP_KERNEL);
1394         if (!udriver)
1395                 return -ENOMEM;
1396
1397         udriver->name = name;
1398         udriver->no_dynamic_id = 1;
1399         udriver->supports_autosuspend = 1;
1400         udriver->suspend = usb_serial_suspend;
1401         udriver->resume = usb_serial_resume;
1402         udriver->probe = usb_serial_probe;
1403         udriver->disconnect = usb_serial_disconnect;
1404
1405         /* we only set the reset_resume field if the serial_driver has one */
1406         for (sd = serial_drivers; *sd; ++sd) {
1407                 if ((*sd)->reset_resume)
1408                         udriver->reset_resume = usb_serial_reset_resume;
1409                         break;
1410         }
1411
1412         rc = usb_register(udriver);
1413         if (rc)
1414                 return rc;
1415
1416         for (sd = serial_drivers; *sd; ++sd) {
1417                 (*sd)->usb_driver = udriver;
1418                 rc = usb_serial_register(*sd);
1419                 if (rc)
1420                         goto failed;
1421         }
1422
1423         /* Now set udriver's id_table and look for matches */
1424         udriver->id_table = id_table;
1425         rc = driver_attach(&udriver->drvwrap.driver);
1426         return 0;
1427
1428  failed:
1429         while (sd-- > serial_drivers)
1430                 usb_serial_deregister(*sd);
1431         usb_deregister(udriver);
1432         return rc;
1433 }
1434 EXPORT_SYMBOL_GPL(usb_serial_register_drivers);
1435
1436 /**
1437  * usb_serial_deregister_drivers - deregister drivers for a usb-serial module
1438  * @serial_drivers: NULL-terminated array of pointers to drivers to be deregistered
1439  *
1440  * Deregisters all the drivers in the @serial_drivers array and deregisters and
1441  * frees the struct usb_driver that was created by the call to
1442  * usb_serial_register_drivers().
1443  */
1444 void usb_serial_deregister_drivers(struct usb_serial_driver *const serial_drivers[])
1445 {
1446         struct usb_driver *udriver = (*serial_drivers)->usb_driver;
1447
1448         for (; *serial_drivers; ++serial_drivers)
1449                 usb_serial_deregister(*serial_drivers);
1450         usb_deregister(udriver);
1451         kfree(udriver);
1452 }
1453 EXPORT_SYMBOL_GPL(usb_serial_deregister_drivers);
1454
1455 /* Module information */
1456 MODULE_AUTHOR(DRIVER_AUTHOR);
1457 MODULE_DESCRIPTION(DRIVER_DESC);
1458 MODULE_LICENSE("GPL");