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