git.oblomov.eu Git - linux-2.6/blob - drivers/usb/serial/usb-serial.c

   1 /*
   2  * USB Serial Converter driver
   3  *
   4  * Copyright (C) 1999 - 2005 Greg Kroah-Hartman (greg@kroah.com)
   5  * Copyright (C) 2000 Peter Berger (pberger@brimson.com)
   6  * Copyright (C) 2000 Al Borchers (borchers@steinerpoint.com)
   7  *
   8  *      This program is free software; you can redistribute it and/or
   9  *      modify it under the terms of the GNU General Public License version
  10  *      2 as published by the Free Software Foundation.
  11  *
  12  * This driver was originally based on the ACM driver by Armin Fuerst (which was
  13  * based on a driver by Brad Keryan)
  14  *
  15  * See Documentation/usb/usb-serial.txt for more information on using this 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", __FUNCTION__, 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", __FUNCTION__, *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", __FUNCTION__);
 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", __FUNCTION__, 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", __FUNCTION__);
 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                 /* only call the device specific open if this
 229                  * is the first time the port is opened */
 230                 retval = serial->type->open(port, filp);
 231                 if (retval)
 232                         goto bailout_module_put;
 233         }
 234
 235         mutex_unlock(&port->mutex);
 236         return 0;
 237
 238 bailout_module_put:
 239         module_put(serial->type->driver.owner);
 240 bailout_mutex_unlock:
 241         port->open_count = 0;
 242         tty->driver_data = NULL;
 243         port->tty = NULL;
 244         mutex_unlock(&port->mutex);
 245 bailout_kref_put:
 246         usb_serial_put(serial);
 247         return retval;
 248 }
 249
 250 static void serial_close(struct tty_struct *tty, struct file * filp)
 251 {
 252         struct usb_serial_port *port = tty->driver_data;
 253
 254         if (!port)
 255                 return;
 256
 257         dbg("%s - port %d", __FUNCTION__, port->number);
 258
 259         mutex_lock(&port->mutex);
 260
 261         if (port->open_count == 0) {
 262                 mutex_unlock(&port->mutex);
 263                 return;
 264         }
 265
 266         --port->open_count;
 267         if (port->open_count == 0) {
 268                 /* only call the device specific close if this
 269                  * port is being closed by the last owner */
 270                 port->serial->type->close(port, filp);
 271
 272                 if (port->tty) {
 273                         if (port->tty->driver_data)
 274                                 port->tty->driver_data = NULL;
 275                         port->tty = NULL;
 276                 }
 277
 278                 module_put(port->serial->type->driver.owner);
 279         }
 280
 281         mutex_unlock(&port->mutex);
 282         usb_serial_put(port->serial);
 283 }
 284
 285 static int serial_write (struct tty_struct * tty, const unsigned char *buf, int count)
 286 {
 287         struct usb_serial_port *port = tty->driver_data;
 288         int retval = -ENODEV;
 289
 290         if (!port || port->serial->dev->state == USB_STATE_NOTATTACHED)
 291                 goto exit;
 292
 293         dbg("%s - port %d, %d byte(s)", __FUNCTION__, port->number, count);
 294
 295         if (!port->open_count) {
 296                 retval = -EINVAL;
 297                 dbg("%s - port not opened", __FUNCTION__);
 298                 goto exit;
 299         }
 300
 301         /* pass on to the driver specific version of this function */
 302         retval = port->serial->type->write(port, buf, count);
 303
 304 exit:
 305         return retval;
 306 }
 307
 308 static int serial_write_room (struct tty_struct *tty)
 309 {
 310         struct usb_serial_port *port = tty->driver_data;
 311         int retval = -ENODEV;
 312
 313         if (!port)
 314                 goto exit;
 315
 316         dbg("%s - port %d", __FUNCTION__, port->number);
 317
 318         if (!port->open_count) {
 319                 dbg("%s - port not open", __FUNCTION__);
 320                 goto exit;
 321         }
 322
 323         /* pass on to the driver specific version of this function */
 324         retval = port->serial->type->write_room(port);
 325
 326 exit:
 327         return retval;
 328 }
 329
 330 static int serial_chars_in_buffer (struct tty_struct *tty)
 331 {
 332         struct usb_serial_port *port = tty->driver_data;
 333         int retval = -ENODEV;
 334
 335         if (!port)
 336                 goto exit;
 337
 338         dbg("%s = port %d", __FUNCTION__, port->number);
 339
 340         if (!port->open_count) {
 341                 dbg("%s - port not open", __FUNCTION__);
 342                 goto exit;
 343         }
 344
 345         /* pass on to the driver specific version of this function */
 346         retval = port->serial->type->chars_in_buffer(port);
 347
 348 exit:
 349         return retval;
 350 }
 351
 352 static void serial_throttle (struct tty_struct * tty)
 353 {
 354         struct usb_serial_port *port = tty->driver_data;
 355
 356         if (!port)
 357                 return;
 358
 359         dbg("%s - port %d", __FUNCTION__, port->number);
 360
 361         if (!port->open_count) {
 362                 dbg ("%s - port not open", __FUNCTION__);
 363                 return;
 364         }
 365
 366         /* pass on to the driver specific version of this function */
 367         if (port->serial->type->throttle)
 368                 port->serial->type->throttle(port);
 369 }
 370
 371 static void serial_unthrottle (struct tty_struct * tty)
 372 {
 373         struct usb_serial_port *port = tty->driver_data;
 374
 375         if (!port)
 376                 return;
 377
 378         dbg("%s - port %d", __FUNCTION__, port->number);
 379
 380         if (!port->open_count) {
 381                 dbg("%s - port not open", __FUNCTION__);
 382                 return;
 383         }
 384
 385         /* pass on to the driver specific version of this function */
 386         if (port->serial->type->unthrottle)
 387                 port->serial->type->unthrottle(port);
 388 }
 389
 390 static int serial_ioctl (struct tty_struct *tty, struct file * file, unsigned int cmd, unsigned long arg)
 391 {
 392         struct usb_serial_port *port = tty->driver_data;
 393         int retval = -ENODEV;
 394
 395         if (!port)
 396                 goto exit;
 397
 398         dbg("%s - port %d, cmd 0x%.4x", __FUNCTION__, port->number, cmd);
 399
 400         if (!port->open_count) {
 401                 dbg ("%s - port not open", __FUNCTION__);
 402                 goto exit;
 403         }
 404
 405         /* pass on to the driver specific version of this function if it is available */
 406         if (port->serial->type->ioctl)
 407                 retval = port->serial->type->ioctl(port, file, cmd, arg);
 408         else
 409                 retval = -ENOIOCTLCMD;
 410
 411 exit:
 412         return retval;
 413 }
 414
 415 static void serial_set_termios (struct tty_struct *tty, struct ktermios * old)
 416 {
 417         struct usb_serial_port *port = tty->driver_data;
 418
 419         if (!port)
 420                 return;
 421
 422         dbg("%s - port %d", __FUNCTION__, port->number);
 423
 424         if (!port->open_count) {
 425                 dbg("%s - port not open", __FUNCTION__);
 426                 return;
 427         }
 428
 429         /* pass on to the driver specific version of this function if it is available */
 430         if (port->serial->type->set_termios)
 431                 port->serial->type->set_termios(port, old);
 432 }
 433
 434 static void serial_break (struct tty_struct *tty, int break_state)
 435 {
 436         struct usb_serial_port *port = tty->driver_data;
 437
 438         if (!port)
 439                 return;
 440
 441         dbg("%s - port %d", __FUNCTION__, port->number);
 442
 443         if (!port->open_count) {
 444                 dbg("%s - port not open", __FUNCTION__);
 445                 return;
 446         }
 447
 448         /* pass on to the driver specific version of this function if it is available */
 449         if (port->serial->type->break_ctl)
 450                 port->serial->type->break_ctl(port, break_state);
 451 }
 452
 453 static int serial_read_proc (char *page, char **start, off_t off, int count, int *eof, void *data)
 454 {
 455         struct usb_serial *serial;
 456         int length = 0;
 457         int i;
 458         off_t begin = 0;
 459         char tmp[40];
 460
 461         dbg("%s", __FUNCTION__);
 462         length += sprintf (page, "usbserinfo:1.0 driver:2.0\n");
 463         for (i = 0; i < SERIAL_TTY_MINORS && length < PAGE_SIZE; ++i) {
 464                 serial = usb_serial_get_by_index(i);
 465                 if (serial == NULL)
 466                         continue;
 467
 468                 length += sprintf (page+length, "%d:", i);
 469                 if (serial->type->driver.owner)
 470                         length += sprintf (page+length, " module:%s", module_name(serial->type->driver.owner));
 471                 length += sprintf (page+length, " name:\"%s\"", serial->type->description);
 472                 length += sprintf (page+length, " vendor:%04x product:%04x",
 473                                    le16_to_cpu(serial->dev->descriptor.idVendor),
 474                                    le16_to_cpu(serial->dev->descriptor.idProduct));
 475                 length += sprintf (page+length, " num_ports:%d", serial->num_ports);
 476                 length += sprintf (page+length, " port:%d", i - serial->minor + 1);
 477
 478                 usb_make_path(serial->dev, tmp, sizeof(tmp));
 479                 length += sprintf (page+length, " path:%s", tmp);
 480
 481                 length += sprintf (page+length, "\n");
 482                 if ((length + begin) > (off + count)) {
 483                         usb_serial_put(serial);
 484                         goto done;
 485                 }
 486                 if ((length + begin) < off) {
 487                         begin += length;
 488                         length = 0;
 489                 }
 490                 usb_serial_put(serial);
 491         }
 492         *eof = 1;
 493 done:
 494         if (off >= (length + begin))
 495                 return 0;
 496         *start = page + (off-begin);
 497         return ((count < begin+length-off) ? count : begin+length-off);
 498 }
 499
 500 static int serial_tiocmget (struct tty_struct *tty, struct file *file)
 501 {
 502         struct usb_serial_port *port = tty->driver_data;
 503
 504         if (!port)
 505                 return -ENODEV;
 506
 507         dbg("%s - port %d", __FUNCTION__, port->number);
 508
 509         if (!port->open_count) {
 510                 dbg("%s - port not open", __FUNCTION__);
 511                 return -ENODEV;
 512         }
 513
 514         if (port->serial->type->tiocmget)
 515                 return port->serial->type->tiocmget(port, file);
 516
 517         return -EINVAL;
 518 }
 519
 520 static int serial_tiocmset (struct tty_struct *tty, struct file *file,
 521                             unsigned int set, unsigned int clear)
 522 {
 523         struct usb_serial_port *port = tty->driver_data;
 524
 525         if (!port)
 526                 return -ENODEV;
 527
 528         dbg("%s - port %d", __FUNCTION__, port->number);
 529
 530         if (!port->open_count) {
 531                 dbg("%s - port not open", __FUNCTION__);
 532                 return -ENODEV;
 533         }
 534
 535         if (port->serial->type->tiocmset)
 536                 return port->serial->type->tiocmset(port, file, set, clear);
 537
 538         return -EINVAL;
 539 }
 540
 541 /*
 542  * We would be calling tty_wakeup here, but unfortunately some line
 543  * disciplines have an annoying habit of calling tty->write from
 544  * the write wakeup callback (e.g. n_hdlc.c).
 545  */
 546 void usb_serial_port_softint(struct usb_serial_port *port)
 547 {
 548         schedule_work(&port->work);
 549 }
 550
 551 static void usb_serial_port_work(struct work_struct *work)
 552 {
 553         struct usb_serial_port *port =
 554                 container_of(work, struct usb_serial_port, work);
 555         struct tty_struct *tty;
 556
 557         dbg("%s - port %d", __FUNCTION__, port->number);
 558
 559         if (!port)
 560                 return;
 561
 562         tty = port->tty;
 563         if (!tty)
 564                 return;
 565
 566         tty_wakeup(tty);
 567 }
 568
 569 static void port_release(struct device *dev)
 570 {
 571         struct usb_serial_port *port = to_usb_serial_port(dev);
 572
 573         dbg ("%s - %s", __FUNCTION__, dev->bus_id);
 574         port_free(port);
 575 }
 576
 577 static void kill_traffic(struct usb_serial_port *port)
 578 {
 579         usb_kill_urb(port->read_urb);
 580         usb_kill_urb(port->write_urb);
 581         usb_kill_urb(port->interrupt_in_urb);
 582         usb_kill_urb(port->interrupt_out_urb);
 583 }
 584
 585 static void port_free(struct usb_serial_port *port)
 586 {
 587         kill_traffic(port);
 588         usb_free_urb(port->read_urb);
 589         usb_free_urb(port->write_urb);
 590         usb_free_urb(port->interrupt_in_urb);
 591         usb_free_urb(port->interrupt_out_urb);
 592         kfree(port->bulk_in_buffer);
 593         kfree(port->bulk_out_buffer);
 594         kfree(port->interrupt_in_buffer);
 595         kfree(port->interrupt_out_buffer);
 596         flush_scheduled_work();         /* port->work */
 597         kfree(port);
 598 }
 599
 600 static struct usb_serial * create_serial (struct usb_device *dev,
 601                                           struct usb_interface *interface,
 602                                           struct usb_serial_driver *driver)
 603 {
 604         struct usb_serial *serial;
 605
 606         serial = kzalloc(sizeof(*serial), GFP_KERNEL);
 607         if (!serial) {
 608                 dev_err(&dev->dev, "%s - out of memory\n", __FUNCTION__);
 609                 return NULL;
 610         }
 611         serial->dev = usb_get_dev(dev);
 612         serial->type = driver;
 613         serial->interface = interface;
 614         kref_init(&serial->kref);
 615
 616         return serial;
 617 }
 618
 619 static const struct usb_device_id *match_dynamic_id(struct usb_interface *intf,
 620                                                     struct usb_serial_driver *drv)
 621 {
 622         struct usb_dynid *dynid;
 623
 624         spin_lock(&drv->dynids.lock);
 625         list_for_each_entry(dynid, &drv->dynids.list, node) {
 626                 if (usb_match_one_id(intf, &dynid->id)) {
 627                         spin_unlock(&drv->dynids.lock);
 628                         return &dynid->id;
 629                 }
 630         }
 631         spin_unlock(&drv->dynids.lock);
 632         return NULL;
 633 }
 634
 635 static const struct usb_device_id *get_iface_id(struct usb_serial_driver *drv,
 636                                                 struct usb_interface *intf)
 637 {
 638         const struct usb_device_id *id;
 639
 640         id = usb_match_id(intf, drv->id_table);
 641         if (id) {
 642                 dbg("static descriptor matches");
 643                 goto exit;
 644         }
 645         id = match_dynamic_id(intf, drv);
 646         if (id)
 647                 dbg("dynamic descriptor matches");
 648 exit:
 649         return id;
 650 }
 651
 652 static struct usb_serial_driver *search_serial_device(struct usb_interface *iface)
 653 {
 654         struct list_head *p;
 655         const struct usb_device_id *id;
 656         struct usb_serial_driver *t;
 657
 658         /* Check if the usb id matches a known device */
 659         list_for_each(p, &usb_serial_driver_list) {
 660                 t = list_entry(p, struct usb_serial_driver, driver_list);
 661                 id = get_iface_id(t, iface);
 662                 if (id)
 663                         return t;
 664         }
 665
 666         return NULL;
 667 }
 668
 669 int usb_serial_probe(struct usb_interface *interface,
 670                                const struct usb_device_id *id)
 671 {
 672         struct usb_device *dev = interface_to_usbdev (interface);
 673         struct usb_serial *serial = NULL;
 674         struct usb_serial_port *port;
 675         struct usb_host_interface *iface_desc;
 676         struct usb_endpoint_descriptor *endpoint;
 677         struct usb_endpoint_descriptor *interrupt_in_endpoint[MAX_NUM_PORTS];
 678         struct usb_endpoint_descriptor *interrupt_out_endpoint[MAX_NUM_PORTS];
 679         struct usb_endpoint_descriptor *bulk_in_endpoint[MAX_NUM_PORTS];
 680         struct usb_endpoint_descriptor *bulk_out_endpoint[MAX_NUM_PORTS];
 681         struct usb_serial_driver *type = NULL;
 682         int retval;
 683         int minor;
 684         int buffer_size;
 685         int i;
 686         int num_interrupt_in = 0;
 687         int num_interrupt_out = 0;
 688         int num_bulk_in = 0;
 689         int num_bulk_out = 0;
 690         int num_ports = 0;
 691         int max_endpoints;
 692
 693         lock_kernel(); /* guard against unloading a serial driver module */
 694         type = search_serial_device(interface);
 695         if (!type) {
 696                 unlock_kernel();
 697                 dbg("none matched");
 698                 return -ENODEV;
 699         }
 700
 701         serial = create_serial (dev, interface, type);
 702         if (!serial) {
 703                 unlock_kernel();
 704                 dev_err(&interface->dev, "%s - out of memory\n", __FUNCTION__);
 705                 return -ENOMEM;
 706         }
 707
 708         /* if this device type has a probe function, call it */
 709         if (type->probe) {
 710                 const struct usb_device_id *id;
 711
 712                 if (!try_module_get(type->driver.owner)) {
 713                         unlock_kernel();
 714                         dev_err(&interface->dev, "module get failed, exiting\n");
 715                         kfree (serial);
 716                         return -EIO;
 717                 }
 718
 719                 id = get_iface_id(type, interface);
 720                 retval = type->probe(serial, id);
 721                 module_put(type->driver.owner);
 722
 723                 if (retval) {
 724                         unlock_kernel();
 725                         dbg ("sub driver rejected device");
 726                         kfree (serial);
 727                         return retval;
 728                 }
 729         }
 730
 731         /* descriptor matches, let's find the endpoints needed */
 732         /* check out the endpoints */
 733         iface_desc = interface->cur_altsetting;
 734         for (i = 0; i < iface_desc->desc.bNumEndpoints; ++i) {
 735                 endpoint = &iface_desc->endpoint[i].desc;
 736
 737                 if (usb_endpoint_is_bulk_in(endpoint)) {
 738                         /* we found a bulk in endpoint */
 739                         dbg("found bulk in on endpoint %d", i);
 740                         bulk_in_endpoint[num_bulk_in] = endpoint;
 741                         ++num_bulk_in;
 742                 }
 743
 744                 if (usb_endpoint_is_bulk_out(endpoint)) {
 745                         /* we found a bulk out endpoint */
 746                         dbg("found bulk out on endpoint %d", i);
 747                         bulk_out_endpoint[num_bulk_out] = endpoint;
 748                         ++num_bulk_out;
 749                 }
 750
 751                 if (usb_endpoint_is_int_in(endpoint)) {
 752                         /* we found a interrupt in endpoint */
 753                         dbg("found interrupt in on endpoint %d", i);
 754                         interrupt_in_endpoint[num_interrupt_in] = endpoint;
 755                         ++num_interrupt_in;
 756                 }
 757
 758                 if (usb_endpoint_is_int_out(endpoint)) {
 759                         /* we found an interrupt out endpoint */
 760                         dbg("found interrupt out on endpoint %d", i);
 761                         interrupt_out_endpoint[num_interrupt_out] = endpoint;
 762                         ++num_interrupt_out;
 763                 }
 764         }
 765
 766 #if defined(CONFIG_USB_SERIAL_PL2303) || defined(CONFIG_USB_SERIAL_PL2303_MODULE)
 767         /* BEGIN HORRIBLE HACK FOR PL2303 */
 768         /* this is needed due to the looney way its endpoints are set up */
 769         if (((le16_to_cpu(dev->descriptor.idVendor) == PL2303_VENDOR_ID) &&
 770              (le16_to_cpu(dev->descriptor.idProduct) == PL2303_PRODUCT_ID)) ||
 771             ((le16_to_cpu(dev->descriptor.idVendor) == ATEN_VENDOR_ID) &&
 772              (le16_to_cpu(dev->descriptor.idProduct) == ATEN_PRODUCT_ID)) ||
 773             ((le16_to_cpu(dev->descriptor.idVendor) == ALCOR_VENDOR_ID) &&
 774              (le16_to_cpu(dev->descriptor.idProduct) == ALCOR_PRODUCT_ID))) {
 775                 if (interface != dev->actconfig->interface[0]) {
 776                         /* check out the endpoints of the other interface*/
 777                         iface_desc = dev->actconfig->interface[0]->cur_altsetting;
 778                         for (i = 0; i < iface_desc->desc.bNumEndpoints; ++i) {
 779                                 endpoint = &iface_desc->endpoint[i].desc;
 780                                 if (usb_endpoint_is_int_in(endpoint)) {
 781                                         /* we found a interrupt in endpoint */
 782                                         dbg("found interrupt in for Prolific device on separate interface");
 783                                         interrupt_in_endpoint[num_interrupt_in] = endpoint;
 784                                         ++num_interrupt_in;
 785                                 }
 786                         }
 787                 }
 788
 789                 /* Now make sure the PL-2303 is configured correctly.
 790                  * If not, give up now and hope this hack will work
 791                  * properly during a later invocation of usb_serial_probe
 792                  */
 793                 if (num_bulk_in == 0 || num_bulk_out == 0) {
 794                         unlock_kernel();
 795                         dev_info(&interface->dev, "PL-2303 hack: descriptors matched but endpoints did not\n");
 796                         kfree (serial);
 797                         return -ENODEV;
 798                 }
 799         }
 800         /* END HORRIBLE HACK FOR PL2303 */
 801 #endif
 802
 803         /* found all that we need */
 804         dev_info(&interface->dev, "%s converter detected\n", type->description);
 805
 806 #ifdef CONFIG_USB_SERIAL_GENERIC
 807         if (type == &usb_serial_generic_device) {
 808                 num_ports = num_bulk_out;
 809                 if (num_ports == 0) {
 810                         unlock_kernel();
 811                         dev_err(&interface->dev, "Generic device with no bulk out, not allowed.\n");
 812                         kfree (serial);
 813                         return -EIO;
 814                 }
 815         }
 816 #endif
 817         if (!num_ports) {
 818                 /* if this device type has a calc_num_ports function, call it */
 819                 if (type->calc_num_ports) {
 820                         if (!try_module_get(type->driver.owner)) {
 821                                 unlock_kernel();
 822                                 dev_err(&interface->dev, "module get failed, exiting\n");
 823                                 kfree (serial);
 824                                 return -EIO;
 825                         }
 826                         num_ports = type->calc_num_ports (serial);
 827                         module_put(type->driver.owner);
 828                 }
 829                 if (!num_ports)
 830                         num_ports = type->num_ports;
 831         }
 832
 833         serial->num_ports = num_ports;
 834         serial->num_bulk_in = num_bulk_in;
 835         serial->num_bulk_out = num_bulk_out;
 836         serial->num_interrupt_in = num_interrupt_in;
 837         serial->num_interrupt_out = num_interrupt_out;
 838
 839         /* create our ports, we need as many as the max endpoints */
 840         /* we don't use num_ports here cauz some devices have more endpoint pairs than ports */
 841         max_endpoints = max(num_bulk_in, num_bulk_out);
 842         max_endpoints = max(max_endpoints, num_interrupt_in);
 843         max_endpoints = max(max_endpoints, num_interrupt_out);
 844         max_endpoints = max(max_endpoints, (int)serial->num_ports);
 845         serial->num_port_pointers = max_endpoints;
 846         unlock_kernel();
 847
 848         dbg("%s - setting up %d port structures for this device", __FUNCTION__, max_endpoints);
 849         for (i = 0; i < max_endpoints; ++i) {
 850                 port = kzalloc(sizeof(struct usb_serial_port), GFP_KERNEL);
 851                 if (!port)
 852                         goto probe_error;
 853                 port->serial = serial;
 854                 spin_lock_init(&port->lock);
 855                 mutex_init(&port->mutex);
 856                 INIT_WORK(&port->work, usb_serial_port_work);
 857                 serial->port[i] = port;
 858         }
 859
 860         /* set up the endpoint information */
 861         for (i = 0; i < num_bulk_in; ++i) {
 862                 endpoint = bulk_in_endpoint[i];
 863                 port = serial->port[i];
 864                 port->read_urb = usb_alloc_urb (0, GFP_KERNEL);
 865                 if (!port->read_urb) {
 866                         dev_err(&interface->dev, "No free urbs available\n");
 867                         goto probe_error;
 868                 }
 869                 buffer_size = le16_to_cpu(endpoint->wMaxPacketSize);
 870                 port->bulk_in_size = buffer_size;
 871                 port->bulk_in_endpointAddress = endpoint->bEndpointAddress;
 872                 port->bulk_in_buffer = kmalloc (buffer_size, GFP_KERNEL);
 873                 if (!port->bulk_in_buffer) {
 874                         dev_err(&interface->dev, "Couldn't allocate bulk_in_buffer\n");
 875                         goto probe_error;
 876                 }
 877                 usb_fill_bulk_urb (port->read_urb, dev,
 878                                    usb_rcvbulkpipe (dev,
 879                                                     endpoint->bEndpointAddress),
 880                                    port->bulk_in_buffer, buffer_size,
 881                                    serial->type->read_bulk_callback,
 882                                    port);
 883         }
 884
 885         for (i = 0; i < num_bulk_out; ++i) {
 886                 endpoint = bulk_out_endpoint[i];
 887                 port = serial->port[i];
 888                 port->write_urb = usb_alloc_urb(0, GFP_KERNEL);
 889                 if (!port->write_urb) {
 890                         dev_err(&interface->dev, "No free urbs available\n");
 891                         goto probe_error;
 892                 }
 893                 buffer_size = le16_to_cpu(endpoint->wMaxPacketSize);
 894                 port->bulk_out_size = buffer_size;
 895                 port->bulk_out_endpointAddress = endpoint->bEndpointAddress;
 896                 port->bulk_out_buffer = kmalloc (buffer_size, GFP_KERNEL);
 897                 if (!port->bulk_out_buffer) {
 898                         dev_err(&interface->dev, "Couldn't allocate bulk_out_buffer\n");
 899                         goto probe_error;
 900                 }
 901                 usb_fill_bulk_urb (port->write_urb, dev,
 902                                    usb_sndbulkpipe (dev,
 903                                                     endpoint->bEndpointAddress),
 904                                    port->bulk_out_buffer, buffer_size,
 905                                    serial->type->write_bulk_callback,
 906                                    port);
 907         }
 908
 909         if (serial->type->read_int_callback) {
 910                 for (i = 0; i < num_interrupt_in; ++i) {
 911                         endpoint = interrupt_in_endpoint[i];
 912                         port = serial->port[i];
 913                         port->interrupt_in_urb = usb_alloc_urb(0, GFP_KERNEL);
 914                         if (!port->interrupt_in_urb) {
 915                                 dev_err(&interface->dev, "No free urbs available\n");
 916                                 goto probe_error;
 917                         }
 918                         buffer_size = le16_to_cpu(endpoint->wMaxPacketSize);
 919                         port->interrupt_in_endpointAddress = endpoint->bEndpointAddress;
 920                         port->interrupt_in_buffer = kmalloc (buffer_size, GFP_KERNEL);
 921                         if (!port->interrupt_in_buffer) {
 922                                 dev_err(&interface->dev, "Couldn't allocate interrupt_in_buffer\n");
 923                                 goto probe_error;
 924                         }
 925                         usb_fill_int_urb (port->interrupt_in_urb, dev,
 926                                           usb_rcvintpipe (dev,
 927                                                           endpoint->bEndpointAddress),
 928                                           port->interrupt_in_buffer, buffer_size,
 929                                           serial->type->read_int_callback, port,
 930                                           endpoint->bInterval);
 931                 }
 932         } else if (num_interrupt_in) {
 933                 dbg("the device claims to support interrupt in transfers, but read_int_callback is not defined");
 934         }
 935
 936         if (serial->type->write_int_callback) {
 937                 for (i = 0; i < num_interrupt_out; ++i) {
 938                         endpoint = interrupt_out_endpoint[i];
 939                         port = serial->port[i];
 940                         port->interrupt_out_urb = usb_alloc_urb(0, GFP_KERNEL);
 941                         if (!port->interrupt_out_urb) {
 942                                 dev_err(&interface->dev, "No free urbs available\n");
 943                                 goto probe_error;
 944                         }
 945                         buffer_size = le16_to_cpu(endpoint->wMaxPacketSize);
 946                         port->interrupt_out_size = buffer_size;
 947                         port->interrupt_out_endpointAddress = endpoint->bEndpointAddress;
 948                         port->interrupt_out_buffer = kmalloc (buffer_size, GFP_KERNEL);
 949                         if (!port->interrupt_out_buffer) {
 950                                 dev_err(&interface->dev, "Couldn't allocate interrupt_out_buffer\n");
 951                                 goto probe_error;
 952                         }
 953                         usb_fill_int_urb (port->interrupt_out_urb, dev,
 954                                           usb_sndintpipe (dev,
 955                                                           endpoint->bEndpointAddress),
 956                                           port->interrupt_out_buffer, buffer_size,
 957                                           serial->type->write_int_callback, port,
 958                                           endpoint->bInterval);
 959                 }
 960         } else if (num_interrupt_out) {
 961                 dbg("the device claims to support interrupt out transfers, but write_int_callback is not defined");
 962         }
 963
 964         /* if this device type has an attach function, call it */
 965         if (type->attach) {
 966                 if (!try_module_get(type->driver.owner)) {
 967                         dev_err(&interface->dev, "module get failed, exiting\n");
 968                         goto probe_error;
 969                 }
 970                 retval = type->attach (serial);
 971                 module_put(type->driver.owner);
 972                 if (retval < 0)
 973                         goto probe_error;
 974                 if (retval > 0) {
 975                         /* quietly accept this device, but don't bind to a serial port
 976                          * as it's about to disappear */
 977                         goto exit;
 978                 }
 979         }
 980
 981         if (get_free_serial (serial, num_ports, &minor) == NULL) {
 982                 dev_err(&interface->dev, "No more free serial devices\n");
 983                 goto probe_error;
 984         }
 985         serial->minor = minor;
 986
 987         /* register all of the individual ports with the driver core */
 988         for (i = 0; i < num_ports; ++i) {
 989                 port = serial->port[i];
 990                 port->dev.parent = &interface->dev;
 991                 port->dev.driver = NULL;
 992                 port->dev.bus = &usb_serial_bus_type;
 993                 port->dev.release = &port_release;
 994
 995                 snprintf (&port->dev.bus_id[0], sizeof(port->dev.bus_id), "ttyUSB%d", port->number);
 996                 dbg ("%s - registering %s", __FUNCTION__, port->dev.bus_id);
 997                 retval = device_register(&port->dev);
 998                 if (retval)
 999                         dev_err(&port->dev, "Error registering port device, "
1000                                 "continuing\n");
1001         }
1002
1003         usb_serial_console_init (debug, minor);
1004
1005 exit:
1006         /* success */
1007         usb_set_intfdata (interface, serial);
1008         return 0;
1009
1010 probe_error:
1011         for (i = 0; i < num_bulk_in; ++i) {
1012                 port = serial->port[i];
1013                 if (!port)
1014                         continue;
1015                 usb_free_urb(port->read_urb);
1016                 kfree(port->bulk_in_buffer);
1017         }
1018         for (i = 0; i < num_bulk_out; ++i) {
1019                 port = serial->port[i];
1020                 if (!port)
1021                         continue;
1022                 usb_free_urb(port->write_urb);
1023                 kfree(port->bulk_out_buffer);
1024         }
1025         for (i = 0; i < num_interrupt_in; ++i) {
1026                 port = serial->port[i];
1027                 if (!port)
1028                         continue;
1029                 usb_free_urb(port->interrupt_in_urb);
1030                 kfree(port->interrupt_in_buffer);
1031         }
1032         for (i = 0; i < num_interrupt_out; ++i) {
1033                 port = serial->port[i];
1034                 if (!port)
1035                         continue;
1036                 usb_free_urb(port->interrupt_out_urb);
1037                 kfree(port->interrupt_out_buffer);
1038         }
1039
1040         /* free up any memory that we allocated */
1041         for (i = 0; i < serial->num_port_pointers; ++i)
1042                 kfree(serial->port[i]);
1043         kfree (serial);
1044         return -EIO;
1045 }
1046
1047 void usb_serial_disconnect(struct usb_interface *interface)
1048 {
1049         int i;
1050         struct usb_serial *serial = usb_get_intfdata (interface);
1051         struct device *dev = &interface->dev;
1052         struct usb_serial_port *port;
1053
1054         usb_serial_console_disconnect(serial);
1055         dbg ("%s", __FUNCTION__);
1056
1057         usb_set_intfdata (interface, NULL);
1058         if (serial) {
1059                 for (i = 0; i < serial->num_ports; ++i) {
1060                         port = serial->port[i];
1061                         if (port) {
1062                                 if (port->tty)
1063                                         tty_hangup(port->tty);
1064                                 kill_traffic(port);
1065                         }
1066                 }
1067                 /* let the last holder of this object
1068                  * cause it to be cleaned up */
1069                 usb_serial_put(serial);
1070         }
1071         dev_info(dev, "device disconnected\n");
1072 }
1073
1074 int usb_serial_suspend(struct usb_interface *intf, pm_message_t message)
1075 {
1076         struct usb_serial *serial = usb_get_intfdata(intf);
1077         struct usb_serial_port *port;
1078         int i, r = 0;
1079
1080         if (!serial) /* device has been disconnected */
1081                 return 0;
1082
1083         for (i = 0; i < serial->num_ports; ++i) {
1084                 port = serial->port[i];
1085                 if (port)
1086                         kill_traffic(port);
1087         }
1088
1089         if (serial->type->suspend)
1090                 r = serial->type->suspend(serial, message);
1091
1092         return r;
1093 }
1094 EXPORT_SYMBOL(usb_serial_suspend);
1095
1096 int usb_serial_resume(struct usb_interface *intf)
1097 {
1098         struct usb_serial *serial = usb_get_intfdata(intf);
1099
1100         return serial->type->resume(serial);
1101 }
1102 EXPORT_SYMBOL(usb_serial_resume);
1103
1104 static const struct tty_operations serial_ops = {
1105         .open =                 serial_open,
1106         .close =                serial_close,
1107         .write =                serial_write,
1108         .write_room =           serial_write_room,
1109         .ioctl =                serial_ioctl,
1110         .set_termios =          serial_set_termios,
1111         .throttle =             serial_throttle,
1112         .unthrottle =           serial_unthrottle,
1113         .break_ctl =            serial_break,
1114         .chars_in_buffer =      serial_chars_in_buffer,
1115         .read_proc =            serial_read_proc,
1116         .tiocmget =             serial_tiocmget,
1117         .tiocmset =             serial_tiocmset,
1118 };
1119
1120 struct tty_driver *usb_serial_tty_driver;
1121
1122 static int __init usb_serial_init(void)
1123 {
1124         int i;
1125         int result;
1126
1127         usb_serial_tty_driver = alloc_tty_driver(SERIAL_TTY_MINORS);
1128         if (!usb_serial_tty_driver)
1129                 return -ENOMEM;
1130
1131         /* Initialize our global data */
1132         for (i = 0; i < SERIAL_TTY_MINORS; ++i) {
1133                 serial_table[i] = NULL;
1134         }
1135
1136         result = bus_register(&usb_serial_bus_type);
1137         if (result) {
1138                 err("%s - registering bus driver failed", __FUNCTION__);
1139                 goto exit_bus;
1140         }
1141
1142         usb_serial_tty_driver->owner = THIS_MODULE;
1143         usb_serial_tty_driver->driver_name = "usbserial";
1144         usb_serial_tty_driver->name =   "ttyUSB";
1145         usb_serial_tty_driver->major = SERIAL_TTY_MAJOR;
1146         usb_serial_tty_driver->minor_start = 0;
1147         usb_serial_tty_driver->type = TTY_DRIVER_TYPE_SERIAL;
1148         usb_serial_tty_driver->subtype = SERIAL_TYPE_NORMAL;
1149         usb_serial_tty_driver->flags = TTY_DRIVER_REAL_RAW | TTY_DRIVER_DYNAMIC_DEV;
1150         usb_serial_tty_driver->init_termios = tty_std_termios;
1151         usb_serial_tty_driver->init_termios.c_cflag = B9600 | CS8 | CREAD | HUPCL | CLOCAL;
1152         tty_set_operations(usb_serial_tty_driver, &serial_ops);
1153         result = tty_register_driver(usb_serial_tty_driver);
1154         if (result) {
1155                 err("%s - tty_register_driver failed", __FUNCTION__);
1156                 goto exit_reg_driver;
1157         }
1158
1159         /* register the USB driver */
1160         result = usb_register(&usb_serial_driver);
1161         if (result < 0) {
1162                 err("%s - usb_register failed", __FUNCTION__);
1163                 goto exit_tty;
1164         }
1165
1166         /* register the generic driver, if we should */
1167         result = usb_serial_generic_register(debug);
1168         if (result < 0) {
1169                 err("%s - registering generic driver failed", __FUNCTION__);
1170                 goto exit_generic;
1171         }
1172
1173         info(DRIVER_DESC);
1174
1175         return result;
1176
1177 exit_generic:
1178         usb_deregister(&usb_serial_driver);
1179
1180 exit_tty:
1181         tty_unregister_driver(usb_serial_tty_driver);
1182
1183 exit_reg_driver:
1184         bus_unregister(&usb_serial_bus_type);
1185
1186 exit_bus:
1187         err ("%s - returning with error %d", __FUNCTION__, result);
1188         put_tty_driver(usb_serial_tty_driver);
1189         return result;
1190 }
1191
1192
1193 static void __exit usb_serial_exit(void)
1194 {
1195         usb_serial_console_exit();
1196
1197         usb_serial_generic_deregister();
1198
1199         usb_deregister(&usb_serial_driver);
1200         tty_unregister_driver(usb_serial_tty_driver);
1201         put_tty_driver(usb_serial_tty_driver);
1202         bus_unregister(&usb_serial_bus_type);
1203 }
1204
1205
1206 module_init(usb_serial_init);
1207 module_exit(usb_serial_exit);
1208
1209 #define set_to_generic_if_null(type, function)                          \
1210         do {                                                            \
1211                 if (!type->function) {                                  \
1212                         type->function = usb_serial_generic_##function; \
1213                         dbg("Had to override the " #function            \
1214                                  " usb serial operation with the generic one.");\
1215                         }                                               \
1216         } while (0)
1217
1218 static void fixup_generic(struct usb_serial_driver *device)
1219 {
1220         set_to_generic_if_null(device, open);
1221         set_to_generic_if_null(device, write);
1222         set_to_generic_if_null(device, close);
1223         set_to_generic_if_null(device, write_room);
1224         set_to_generic_if_null(device, chars_in_buffer);
1225         set_to_generic_if_null(device, read_bulk_callback);
1226         set_to_generic_if_null(device, write_bulk_callback);
1227         set_to_generic_if_null(device, shutdown);
1228 }
1229
1230 int usb_serial_register(struct usb_serial_driver *driver) /* must be called with BKL held */
1231 {
1232         int retval;
1233
1234         fixup_generic(driver);
1235
1236         if (!driver->description)
1237                 driver->description = driver->driver.name;
1238
1239         /* Add this device to our list of devices */
1240         list_add(&driver->driver_list, &usb_serial_driver_list);
1241
1242         retval = usb_serial_bus_register(driver);
1243         if (retval) {
1244                 err("problem %d when registering driver %s", retval, driver->description);
1245                 list_del(&driver->driver_list);
1246         }
1247         else
1248                 info("USB Serial support registered for %s", driver->description);
1249
1250         return retval;
1251 }
1252
1253
1254 void usb_serial_deregister(struct usb_serial_driver *device) /* must be called with BKL held */
1255 {
1256         info("USB Serial deregistering driver %s", device->description);
1257         list_del(&device->driver_list);
1258         usb_serial_bus_deregister(device);
1259 }
1260
1261
1262
1263 /* If the usb-serial core is built into the core, the usb-serial drivers
1264    need these symbols to load properly as modules. */
1265 EXPORT_SYMBOL_GPL(usb_serial_register);
1266 EXPORT_SYMBOL_GPL(usb_serial_deregister);
1267 EXPORT_SYMBOL_GPL(usb_serial_probe);
1268 EXPORT_SYMBOL_GPL(usb_serial_disconnect);
1269 EXPORT_SYMBOL_GPL(usb_serial_port_softint);
1270
1271
1272 /* Module information */
1273 MODULE_AUTHOR( DRIVER_AUTHOR );
1274 MODULE_DESCRIPTION( DRIVER_DESC );
1275 MODULE_LICENSE("GPL");
1276
1277 module_param(debug, bool, S_IRUGO | S_IWUSR);
1278 MODULE_PARM_DESC(debug, "Debug enabled or not");