1/* 2 * USB Serial Converter driver 3 * 4 * Copyright (C) 1999 - 2005 Greg Kroah-Hartman (greg@kroah.com) 5 * Copyright (C) 2000 Peter Berger (pberger@brimson.com) 6 * Copyright (C) 2000 Al Borchers (borchers@steinerpoint.com) 7 * 8 * This program is free software; you can redistribute it and/or 9 * modify it under the terms of the GNU General Public License version 10 * 2 as published by the Free Software Foundation. 11 * 12 * This driver was originally based on the ACM driver by Armin Fuerst (which was 13 * based on a driver by Brad Keryan) 14 * 15 * See Documentation/usb/usb-serial.txt for more information on using this 16 * driver 17 * 18 */ 19 20#include <linux/kernel.h> 21#include <linux/errno.h> 22#include <linux/init.h> 23#include <linux/slab.h> 24#include <linux/tty.h> 25#include <linux/tty_driver.h> 26#include <linux/tty_flip.h> 27#include <linux/module.h> 28#include <linux/moduleparam.h> 29#include <linux/seq_file.h> 30#include <linux/spinlock.h> 31#include <linux/mutex.h> 32#include <linux/list.h> 33#include <linux/uaccess.h> 34#include <linux/serial.h> 35#include <linux/usb.h> 36#include <linux/usb/serial.h> 37#include <linux/kfifo.h> 38#include "pl2303.h" 39 40/* 41 * Version Information 42 */ 43#define DRIVER_AUTHOR "Greg Kroah-Hartman, greg@kroah.com, http://www.kroah.com/linux/" 44#define DRIVER_DESC "USB Serial Driver core" 45 46/* Driver structure we register with the USB core */ 47static struct usb_driver usb_serial_driver = { 48 .name = "usbserial", 49 .probe = usb_serial_probe, 50 .disconnect = usb_serial_disconnect, 51 .suspend = usb_serial_suspend, 52 .resume = usb_serial_resume, 53 .no_dynamic_id = 1, 54 .supports_autosuspend = 1, 55}; 56 57/* There is no MODULE_DEVICE_TABLE for usbserial.c. Instead 58 the MODULE_DEVICE_TABLE declarations in each serial driver 59 cause the "hotplug" program to pull in whatever module is necessary 60 via modprobe, and modprobe will load usbserial because the serial 61 drivers depend on it. 62*/ 63 64static bool debug; 65/* initially all NULL */ 66static struct usb_serial *serial_table[SERIAL_TTY_MINORS]; 67static DEFINE_MUTEX(table_lock); 68static LIST_HEAD(usb_serial_driver_list); 69 70/* 71 * Look up the serial structure. If it is found and it hasn't been 72 * disconnected, return with its disc_mutex held and its refcount 73 * incremented. Otherwise return NULL. 74 */ 75struct usb_serial *usb_serial_get_by_index(unsigned index) 76{ 77 struct usb_serial *serial; 78 79 mutex_lock(&table_lock); 80 serial = serial_table[index]; 81 82 if (serial) { 83 mutex_lock(&serial->disc_mutex); 84 if (serial->disconnected) { 85 mutex_unlock(&serial->disc_mutex); 86 serial = NULL; 87 } else { 88 kref_get(&serial->kref); 89 } 90 } 91 mutex_unlock(&table_lock); 92 return serial; 93} 94 95static struct usb_serial *get_free_serial(struct usb_serial *serial, 96 int num_ports, unsigned int *minor) 97{ 98 unsigned int i, j; 99 int good_spot; 100 101 dbg("%s %d", __func__, num_ports); 102 103 *minor = 0; 104 mutex_lock(&table_lock); 105 for (i = 0; i < SERIAL_TTY_MINORS; ++i) { 106 if (serial_table[i]) 107 continue; 108 109 good_spot = 1; 110 for (j = 1; j <= num_ports-1; ++j) 111 if ((i+j >= SERIAL_TTY_MINORS) || (serial_table[i+j])) { 112 good_spot = 0; 113 i += j; 114 break; 115 } 116 if (good_spot == 0) 117 continue; 118 119 *minor = i; 120 j = 0; 121 dbg("%s - minor base = %d", __func__, *minor); 122 for (i = *minor; (i < (*minor + num_ports)) && (i < SERIAL_TTY_MINORS); ++i) { 123 serial_table[i] = serial; 124 serial->port[j++]->number = i; 125 } 126 mutex_unlock(&table_lock); 127 return serial; 128 } 129 mutex_unlock(&table_lock); 130 return NULL; 131} 132 133static void return_serial(struct usb_serial *serial) 134{ 135 int i; 136 137 dbg("%s", __func__); 138 139 mutex_lock(&table_lock); 140 for (i = 0; i < serial->num_ports; ++i) 141 serial_table[serial->minor + i] = NULL; 142 mutex_unlock(&table_lock); 143} 144 145static void destroy_serial(struct kref *kref) 146{ 147 struct usb_serial *serial; 148 struct usb_serial_port *port; 149 int i; 150 151 serial = to_usb_serial(kref); 152 153 dbg("%s - %s", __func__, serial->type->description); 154 155 /* return the minor range that this device had */ 156 if (serial->minor != SERIAL_TTY_NO_MINOR) 157 return_serial(serial); 158 159 if (serial->attached) 160 serial->type->release(serial); 161 162 /* Now that nothing is using the ports, they can be freed */ 163 for (i = 0; i < serial->num_port_pointers; ++i) { 164 port = serial->port[i]; 165 if (port) { 166 port->serial = NULL; 167 put_device(&port->dev); 168 } 169 } 170 171 usb_put_dev(serial->dev); 172 kfree(serial); 173} 174 175void usb_serial_put(struct usb_serial *serial) 176{ 177 kref_put(&serial->kref, destroy_serial); 178} 179 180/***************************************************************************** 181 * Driver tty interface functions 182 *****************************************************************************/ 183 184/** 185 * serial_install - install tty 186 * @driver: the driver (USB in our case) 187 * @tty: the tty being created 188 * 189 * Create the termios objects for this tty. We use the default 190 * USB serial settings but permit them to be overridden by 191 * serial->type->init_termios. 192 * 193 * This is the first place a new tty gets used. Hence this is where we 194 * acquire references to the usb_serial structure and the driver module, 195 * where we store a pointer to the port, and where we do an autoresume. 196 * All these actions are reversed in serial_cleanup(). 197 */ 198static int serial_install(struct tty_driver *driver, struct tty_struct *tty) 199{ 200 int idx = tty->index; 201 struct usb_serial *serial; 202 struct usb_serial_port *port; 203 int retval = -ENODEV; 204 205 dbg("%s", __func__); 206 207 serial = usb_serial_get_by_index(idx); 208 if (!serial) 209 return retval; 210 211 port = serial->port[idx - serial->minor]; 212 if (!port) 213 goto error_no_port; 214 if (!try_module_get(serial->type->driver.owner)) 215 goto error_module_get; 216 217 retval = usb_autopm_get_interface(serial->interface); 218 if (retval) 219 goto error_get_interface; 220 221 retval = tty_standard_install(driver, tty); 222 if (retval) 223 goto error_init_termios; 224 225 mutex_unlock(&serial->disc_mutex); 226 227 /* allow the driver to update the settings */ 228 if (serial->type->init_termios) 229 serial->type->init_termios(tty); 230 231 tty->driver_data = port; 232 233 return retval; 234 235 error_init_termios: 236 usb_autopm_put_interface(serial->interface); 237 error_get_interface: 238 module_put(serial->type->driver.owner); 239 error_module_get: 240 error_no_port: 241 usb_serial_put(serial); 242 mutex_unlock(&serial->disc_mutex); 243 return retval; 244} 245 246static int serial_activate(struct tty_port *tport, struct tty_struct *tty) 247{ 248 struct usb_serial_port *port = 249 container_of(tport, struct usb_serial_port, port); 250 struct usb_serial *serial = port->serial; 251 int retval; 252 253 mutex_lock(&serial->disc_mutex); 254 if (serial->disconnected) 255 retval = -ENODEV; 256 else 257 retval = port->serial->type->open(tty, port); 258 mutex_unlock(&serial->disc_mutex); 259 260 if (retval < 0) 261 retval = usb_translate_errors(retval); 262 263 return retval; 264} 265 266static int serial_open(struct tty_struct *tty, struct file *filp) 267{ 268 struct usb_serial_port *port = tty->driver_data; 269 270 dbg("%s - port %d", __func__, port->number); 271 return tty_port_open(&port->port, tty, filp); 272} 273 274/** 275 * serial_down - shut down hardware 276 * @tport: tty port to shut down 277 * 278 * Shut down a USB serial port unless it is the console. We never 279 * shut down the console hardware as it will always be in use. Serialized 280 * against activate by the tport mutex and kept to matching open/close pairs 281 * of calls by the ASYNCB_INITIALIZED flag. 282 */ 283static void serial_down(struct tty_port *tport) 284{ 285 struct usb_serial_port *port = 286 container_of(tport, struct usb_serial_port, port); 287 struct usb_serial_driver *drv = port->serial->type; 288 /* 289 * The console is magical. Do not hang up the console hardware 290 * or there will be tears. 291 */ 292 if (port->port.console) 293 return; 294 if (drv->close) 295 drv->close(port); 296} 297 298static void serial_hangup(struct tty_struct *tty) 299{ 300 struct usb_serial_port *port = tty->driver_data; 301 dbg("%s - port %d", __func__, port->number); 302 tty_port_hangup(&port->port); 303} 304 305static void serial_close(struct tty_struct *tty, struct file *filp) 306{ 307 struct usb_serial_port *port = tty->driver_data; 308 dbg("%s - port %d", __func__, port->number); 309 tty_port_close(&port->port, tty, filp); 310} 311 312/** 313 * serial_cleanup - free resources post close/hangup 314 * @port: port to free up 315 * 316 * Do the resource freeing and refcount dropping for the port. 317 * Avoid freeing the console. 318 * 319 * Called asynchronously after the last tty kref is dropped, 320 * and the tty layer has already done the tty_shutdown(tty); 321 */ 322static void serial_cleanup(struct tty_struct *tty) 323{ 324 struct usb_serial_port *port = tty->driver_data; 325 struct usb_serial *serial; 326 struct module *owner; 327 328 /* The console is magical. Do not hang up the console hardware 329 * or there will be tears. 330 */ 331 if (port->port.console) 332 return; 333 334 dbg("%s - port %d", __func__, port->number); 335 336 tty->driver_data = NULL; 337 338 serial = port->serial; 339 owner = serial->type->driver.owner; 340 341 mutex_lock(&serial->disc_mutex); 342 if (!serial->disconnected) 343 usb_autopm_put_interface(serial->interface); 344 mutex_unlock(&serial->disc_mutex); 345 346 usb_serial_put(serial); 347 module_put(owner); 348} 349 350static int serial_write(struct tty_struct *tty, const unsigned char *buf, 351 int count) 352{ 353 struct usb_serial_port *port = tty->driver_data; 354 int retval = -ENODEV; 355 356 if (port->serial->dev->state == USB_STATE_NOTATTACHED) 357 goto exit; 358 359 dbg("%s - port %d, %d byte(s)", __func__, port->number, count); 360 361 /* pass on to the driver specific version of this function */ 362 retval = port->serial->type->write(tty, port, buf, count); 363 if (retval < 0) 364 retval = usb_translate_errors(retval); 365exit: 366 return retval; 367} 368 369static int serial_write_room(struct tty_struct *tty) 370{ 371 struct usb_serial_port *port = tty->driver_data; 372 dbg("%s - port %d", __func__, port->number); 373 /* pass on to the driver specific version of this function */ 374 return port->serial->type->write_room(tty); 375} 376 377static int serial_chars_in_buffer(struct tty_struct *tty) 378{ 379 struct usb_serial_port *port = tty->driver_data; 380 dbg("%s - port %d", __func__, port->number); 381 382 /* if the device was unplugged then any remaining characters 383 fell out of the connector ;) */ 384 if (port->serial->disconnected) 385 return 0; 386 /* pass on to the driver specific version of this function */ 387 return port->serial->type->chars_in_buffer(tty); 388} 389 390static void serial_throttle(struct tty_struct *tty) 391{ 392 struct usb_serial_port *port = tty->driver_data; 393 dbg("%s - port %d", __func__, port->number); 394 395 /* pass on to the driver specific version of this function */ 396 if (port->serial->type->throttle) 397 port->serial->type->throttle(tty); 398} 399 400static void serial_unthrottle(struct tty_struct *tty) 401{ 402 struct usb_serial_port *port = tty->driver_data; 403 dbg("%s - port %d", __func__, port->number); 404 405 /* pass on to the driver specific version of this function */ 406 if (port->serial->type->unthrottle) 407 port->serial->type->unthrottle(tty); 408} 409 410static int serial_ioctl(struct tty_struct *tty, 411 unsigned int cmd, unsigned long arg) 412{ 413 struct usb_serial_port *port = tty->driver_data; 414 int retval = -ENODEV; 415 416 dbg("%s - port %d, cmd 0x%.4x", __func__, port->number, cmd); 417 418 /* pass on to the driver specific version of this function 419 if it is available */ 420 if (port->serial->type->ioctl) { 421 retval = port->serial->type->ioctl(tty, cmd, arg); 422 } else 423 retval = -ENOIOCTLCMD; 424 return retval; 425} 426 427static void serial_set_termios(struct tty_struct *tty, struct ktermios *old) 428{ 429 struct usb_serial_port *port = tty->driver_data; 430 dbg("%s - port %d", __func__, port->number); 431 432 /* pass on to the driver specific version of this function 433 if it is available */ 434 if (port->serial->type->set_termios) 435 port->serial->type->set_termios(tty, port, old); 436 else 437 tty_termios_copy_hw(tty->termios, old); 438} 439 440static int serial_break(struct tty_struct *tty, int break_state) 441{ 442 struct usb_serial_port *port = tty->driver_data; 443 444 dbg("%s - port %d", __func__, port->number); 445 446 /* pass on to the driver specific version of this function 447 if it is available */ 448 if (port->serial->type->break_ctl) 449 port->serial->type->break_ctl(tty, break_state); 450 return 0; 451} 452 453static int serial_proc_show(struct seq_file *m, void *v) 454{ 455 struct usb_serial *serial; 456 int i; 457 char tmp[40]; 458 459 dbg("%s", __func__); 460 seq_puts(m, "usbserinfo:1.0 driver:2.0\n"); 461 for (i = 0; i < SERIAL_TTY_MINORS; ++i) { 462 serial = usb_serial_get_by_index(i); 463 if (serial == NULL) 464 continue; 465 466 seq_printf(m, "%d:", i); 467 if (serial->type->driver.owner) 468 seq_printf(m, " module:%s", 469 module_name(serial->type->driver.owner)); 470 seq_printf(m, " name:\"%s\"", 471 serial->type->description); 472 seq_printf(m, " vendor:%04x product:%04x", 473 le16_to_cpu(serial->dev->descriptor.idVendor), 474 le16_to_cpu(serial->dev->descriptor.idProduct)); 475 seq_printf(m, " num_ports:%d", serial->num_ports); 476 seq_printf(m, " port:%d", i - serial->minor + 1); 477 usb_make_path(serial->dev, tmp, sizeof(tmp)); 478 seq_printf(m, " path:%s", tmp); 479 480 seq_putc(m, '\n'); 481 usb_serial_put(serial); 482 mutex_unlock(&serial->disc_mutex); 483 } 484 return 0; 485} 486 487static int serial_proc_open(struct inode *inode, struct file *file) 488{ 489 return single_open(file, serial_proc_show, NULL); 490} 491 492static const struct file_operations serial_proc_fops = { 493 .owner = THIS_MODULE, 494 .open = serial_proc_open, 495 .read = seq_read, 496 .llseek = seq_lseek, 497 .release = single_release, 498}; 499 500static int serial_tiocmget(struct tty_struct *tty) 501{ 502 struct usb_serial_port *port = tty->driver_data; 503 504 dbg("%s - port %d", __func__, port->number); 505 506 if (port->serial->type->tiocmget) 507 return port->serial->type->tiocmget(tty); 508 return -EINVAL; 509} 510 511static int serial_tiocmset(struct tty_struct *tty, 512 unsigned int set, unsigned int clear) 513{ 514 struct usb_serial_port *port = tty->driver_data; 515 516 dbg("%s - port %d", __func__, port->number); 517 518 if (port->serial->type->tiocmset) 519 return port->serial->type->tiocmset(tty, set, clear); 520 return -EINVAL; 521} 522 523static int serial_get_icount(struct tty_struct *tty, 524 struct serial_icounter_struct *icount) 525{ 526 struct usb_serial_port *port = tty->driver_data; 527 528 dbg("%s - port %d", __func__, port->number); 529 530 if (port->serial->type->get_icount) 531 return port->serial->type->get_icount(tty, icount); 532 return -EINVAL; 533} 534 535/* 536 * We would be calling tty_wakeup here, but unfortunately some line 537 * disciplines have an annoying habit of calling tty->write from 538 * the write wakeup callback (e.g. n_hdlc.c). 539 */ 540void usb_serial_port_softint(struct usb_serial_port *port) 541{ 542 schedule_work(&port->work); 543} 544EXPORT_SYMBOL_GPL(usb_serial_port_softint); 545 546static void usb_serial_port_work(struct work_struct *work) 547{ 548 struct usb_serial_port *port = 549 container_of(work, struct usb_serial_port, work); 550 struct tty_struct *tty; 551 552 dbg("%s - port %d", __func__, port->number); 553 554 tty = tty_port_tty_get(&port->port); 555 if (!tty) 556 return; 557 558 tty_wakeup(tty); 559 tty_kref_put(tty); 560} 561 562static void kill_traffic(struct usb_serial_port *port) 563{ 564 int i; 565 566 for (i = 0; i < ARRAY_SIZE(port->read_urbs); ++i) 567 usb_kill_urb(port->read_urbs[i]); 568 for (i = 0; i < ARRAY_SIZE(port->write_urbs); ++i) 569 usb_kill_urb(port->write_urbs[i]); 570 /* 571 * This is tricky. 572 * Some drivers submit the read_urb in the 573 * handler for the write_urb or vice versa 574 * this order determines the order in which 575 * usb_kill_urb() must be used to reliably 576 * kill the URBs. As it is unknown here, 577 * both orders must be used in turn. 578 * The call below is not redundant. 579 */ 580 usb_kill_urb(port->read_urb); 581 usb_kill_urb(port->interrupt_in_urb); 582 usb_kill_urb(port->interrupt_out_urb); 583} 584 585static void port_release(struct device *dev) 586{ 587 struct usb_serial_port *port = to_usb_serial_port(dev); 588 int i; 589 590 dbg ("%s - %s", __func__, dev_name(dev)); 591 592 /* 593 * Stop all the traffic before cancelling the work, so that 594 * nobody will restart it by calling usb_serial_port_softint. 595 */ 596 kill_traffic(port); 597 cancel_work_sync(&port->work); 598 599 usb_free_urb(port->interrupt_in_urb); 600 usb_free_urb(port->interrupt_out_urb); 601 for (i = 0; i < ARRAY_SIZE(port->read_urbs); ++i) { 602 usb_free_urb(port->read_urbs[i]); 603 kfree(port->bulk_in_buffers[i]); 604 } 605 for (i = 0; i < ARRAY_SIZE(port->write_urbs); ++i) { 606 usb_free_urb(port->write_urbs[i]); 607 kfree(port->bulk_out_buffers[i]); 608 } 609 kfifo_free(&port->write_fifo); 610 kfree(port->interrupt_in_buffer); 611 kfree(port->interrupt_out_buffer); 612 kfree(port); 613} 614 615static struct usb_serial *create_serial(struct usb_device *dev, 616 struct usb_interface *interface, 617 struct usb_serial_driver *driver) 618{ 619 struct usb_serial *serial; 620 621 serial = kzalloc(sizeof(*serial), GFP_KERNEL); 622 if (!serial) { 623 dev_err(&dev->dev, "%s - out of memory\n", __func__); 624 return NULL; 625 } 626 serial->dev = usb_get_dev(dev); 627 serial->type = driver; 628 serial->interface = interface; 629 kref_init(&serial->kref); 630 mutex_init(&serial->disc_mutex); 631 serial->minor = SERIAL_TTY_NO_MINOR; 632 633 return serial; 634} 635 636static const struct usb_device_id *match_dynamic_id(struct usb_interface *intf, 637 struct usb_serial_driver *drv) 638{ 639 struct usb_dynid *dynid; 640 641 spin_lock(&drv->dynids.lock); 642 list_for_each_entry(dynid, &drv->dynids.list, node) { 643 if (usb_match_one_id(intf, &dynid->id)) { 644 spin_unlock(&drv->dynids.lock); 645 return &dynid->id; 646 } 647 } 648 spin_unlock(&drv->dynids.lock); 649 return NULL; 650} 651 652static const struct usb_device_id *get_iface_id(struct usb_serial_driver *drv, 653 struct usb_interface *intf) 654{ 655 const struct usb_device_id *id; 656 657 id = usb_match_id(intf, drv->id_table); 658 if (id) { 659 dbg("static descriptor matches"); 660 goto exit; 661 } 662 id = match_dynamic_id(intf, drv); 663 if (id) 664 dbg("dynamic descriptor matches"); 665exit: 666 return id; 667} 668 669/* Caller must hold table_lock */ 670static struct usb_serial_driver *search_serial_device( 671 struct usb_interface *iface) 672{ 673 const struct usb_device_id *id = NULL; 674 struct usb_serial_driver *drv; 675 struct usb_driver *driver = to_usb_driver(iface->dev.driver); 676 677 /* Check if the usb id matches a known device */ 678 list_for_each_entry(drv, &usb_serial_driver_list, driver_list) { 679 if (drv->usb_driver == driver) 680 id = get_iface_id(drv, iface); 681 if (id) 682 return drv; 683 } 684 685 return NULL; 686} 687 688static int serial_carrier_raised(struct tty_port *port) 689{ 690 struct usb_serial_port *p = container_of(port, struct usb_serial_port, port); 691 struct usb_serial_driver *drv = p->serial->type; 692 693 if (drv->carrier_raised) 694 return drv->carrier_raised(p); 695 /* No carrier control - don't block */ 696 return 1; 697} 698 699static void serial_dtr_rts(struct tty_port *port, int on) 700{ 701 struct usb_serial_port *p = container_of(port, struct usb_serial_port, port); 702 struct usb_serial_driver *drv = p->serial->type; 703 704 if (drv->dtr_rts) 705 drv->dtr_rts(p, on); 706} 707 708static const struct tty_port_operations serial_port_ops = { 709 .carrier_raised = serial_carrier_raised, 710 .dtr_rts = serial_dtr_rts, 711 .activate = serial_activate, 712 .shutdown = serial_down, 713}; 714 715int usb_serial_probe(struct usb_interface *interface, 716 const struct usb_device_id *id) 717{ 718 struct usb_device *dev = interface_to_usbdev(interface); 719 struct usb_serial *serial = NULL; 720 struct usb_serial_port *port; 721 struct usb_host_interface *iface_desc; 722 struct usb_endpoint_descriptor *endpoint; 723 struct usb_endpoint_descriptor *interrupt_in_endpoint[MAX_NUM_PORTS]; 724 struct usb_endpoint_descriptor *interrupt_out_endpoint[MAX_NUM_PORTS]; 725 struct usb_endpoint_descriptor *bulk_in_endpoint[MAX_NUM_PORTS]; 726 struct usb_endpoint_descriptor *bulk_out_endpoint[MAX_NUM_PORTS]; 727 struct usb_serial_driver *type = NULL; 728 int retval; 729 unsigned int minor; 730 int buffer_size; 731 int i; 732 int j; 733 int num_interrupt_in = 0; 734 int num_interrupt_out = 0; 735 int num_bulk_in = 0; 736 int num_bulk_out = 0; 737 int num_ports = 0; 738 int max_endpoints; 739 740 mutex_lock(&table_lock); 741 type = search_serial_device(interface); 742 if (!type) { 743 mutex_unlock(&table_lock); 744 dbg("none matched"); 745 return -ENODEV; 746 } 747 748 if (!try_module_get(type->driver.owner)) { 749 mutex_unlock(&table_lock); 750 dev_err(&interface->dev, "module get failed, exiting\n"); 751 return -EIO; 752 } 753 mutex_unlock(&table_lock); 754 755 serial = create_serial(dev, interface, type); 756 if (!serial) { 757 module_put(type->driver.owner); 758 dev_err(&interface->dev, "%s - out of memory\n", __func__); 759 return -ENOMEM; 760 } 761 762 /* if this device type has a probe function, call it */ 763 if (type->probe) { 764 const struct usb_device_id *id; 765 766 id = get_iface_id(type, interface); 767 retval = type->probe(serial, id); 768 769 if (retval) { 770 dbg("sub driver rejected device"); 771 kfree(serial); 772 module_put(type->driver.owner); 773 return retval; 774 } 775 } 776 777 /* descriptor matches, let's find the endpoints needed */ 778 /* check out the endpoints */ 779 iface_desc = interface->cur_altsetting; 780 for (i = 0; i < iface_desc->desc.bNumEndpoints; ++i) { 781 endpoint = &iface_desc->endpoint[i].desc; 782 783 if (usb_endpoint_is_bulk_in(endpoint)) { 784 /* we found a bulk in endpoint */ 785 dbg("found bulk in on endpoint %d", i); 786 bulk_in_endpoint[num_bulk_in] = endpoint; 787 ++num_bulk_in; 788 } 789 790 if (usb_endpoint_is_bulk_out(endpoint)) { 791 /* we found a bulk out endpoint */ 792 dbg("found bulk out on endpoint %d", i); 793 bulk_out_endpoint[num_bulk_out] = endpoint; 794 ++num_bulk_out; 795 } 796 797 if (usb_endpoint_is_int_in(endpoint)) { 798 /* we found a interrupt in endpoint */ 799 dbg("found interrupt in on endpoint %d", i); 800 interrupt_in_endpoint[num_interrupt_in] = endpoint; 801 ++num_interrupt_in; 802 } 803 804 if (usb_endpoint_is_int_out(endpoint)) { 805 /* we found an interrupt out endpoint */ 806 dbg("found interrupt out on endpoint %d", i); 807 interrupt_out_endpoint[num_interrupt_out] = endpoint; 808 ++num_interrupt_out; 809 } 810 } 811 812#if defined(CONFIG_USB_SERIAL_PL2303) || defined(CONFIG_USB_SERIAL_PL2303_MODULE) 813 /* BEGIN HORRIBLE HACK FOR PL2303 */ 814 /* this is needed due to the looney way its endpoints are set up */ 815 if (((le16_to_cpu(dev->descriptor.idVendor) == PL2303_VENDOR_ID) && 816 (le16_to_cpu(dev->descriptor.idProduct) == PL2303_PRODUCT_ID)) || 817 ((le16_to_cpu(dev->descriptor.idVendor) == ATEN_VENDOR_ID) && 818 (le16_to_cpu(dev->descriptor.idProduct) == ATEN_PRODUCT_ID)) || 819 ((le16_to_cpu(dev->descriptor.idVendor) == ALCOR_VENDOR_ID) && 820 (le16_to_cpu(dev->descriptor.idProduct) == ALCOR_PRODUCT_ID)) || 821 ((le16_to_cpu(dev->descriptor.idVendor) == SIEMENS_VENDOR_ID) && 822 (le16_to_cpu(dev->descriptor.idProduct) == SIEMENS_PRODUCT_ID_EF81))) { 823 if (interface != dev->actconfig->interface[0]) { 824 /* check out the endpoints of the other interface*/ 825 iface_desc = dev->actconfig->interface[0]->cur_altsetting; 826 for (i = 0; i < iface_desc->desc.bNumEndpoints; ++i) { 827 endpoint = &iface_desc->endpoint[i].desc; 828 if (usb_endpoint_is_int_in(endpoint)) { 829 /* we found a interrupt in endpoint */ 830 dbg("found interrupt in for Prolific device on separate interface"); 831 interrupt_in_endpoint[num_interrupt_in] = endpoint; 832 ++num_interrupt_in; 833 } 834 } 835 } 836 837 /* Now make sure the PL-2303 is configured correctly. 838 * If not, give up now and hope this hack will work 839 * properly during a later invocation of usb_serial_probe 840 */ 841 if (num_bulk_in == 0 || num_bulk_out == 0) { 842 dev_info(&interface->dev, "PL-2303 hack: descriptors matched but endpoints did not\n"); 843 kfree(serial); 844 module_put(type->driver.owner); 845 return -ENODEV; 846 } 847 } 848 /* END HORRIBLE HACK FOR PL2303 */ 849#endif 850 851#ifdef CONFIG_USB_SERIAL_GENERIC 852 if (type == &usb_serial_generic_device) { 853 num_ports = num_bulk_out; 854 if (num_ports == 0) { 855 dev_err(&interface->dev, 856 "Generic device with no bulk out, not allowed.\n"); 857 kfree(serial); 858 module_put(type->driver.owner); 859 return -EIO; 860 } 861 } 862#endif 863 if (!num_ports) { 864 /* if this device type has a calc_num_ports function, call it */ 865 if (type->calc_num_ports) 866 num_ports = type->calc_num_ports(serial); 867 if (!num_ports) 868 num_ports = type->num_ports; 869 } 870 871 serial->num_ports = num_ports; 872 serial->num_bulk_in = num_bulk_in; 873 serial->num_bulk_out = num_bulk_out; 874 serial->num_interrupt_in = num_interrupt_in; 875 serial->num_interrupt_out = num_interrupt_out; 876 877 /* found all that we need */ 878 dev_info(&interface->dev, "%s converter detected\n", 879 type->description); 880 881 /* create our ports, we need as many as the max endpoints */ 882 /* we don't use num_ports here because some devices have more 883 endpoint pairs than ports */ 884 max_endpoints = max(num_bulk_in, num_bulk_out); 885 max_endpoints = max(max_endpoints, num_interrupt_in); 886 max_endpoints = max(max_endpoints, num_interrupt_out); 887 max_endpoints = max(max_endpoints, (int)serial->num_ports); 888 serial->num_port_pointers = max_endpoints; 889 890 dbg("%s - setting up %d port structures for this device", 891 __func__, max_endpoints); 892 for (i = 0; i < max_endpoints; ++i) { 893 port = kzalloc(sizeof(struct usb_serial_port), GFP_KERNEL); 894 if (!port) 895 goto probe_error; 896 tty_port_init(&port->port); 897 port->port.ops = &serial_port_ops; 898 port->serial = serial; 899 spin_lock_init(&port->lock); 900 /* Keep this for private driver use for the moment but 901 should probably go away */ 902 INIT_WORK(&port->work, usb_serial_port_work); 903 serial->port[i] = port; 904 port->dev.parent = &interface->dev; 905 port->dev.driver = NULL; 906 port->dev.bus = &usb_serial_bus_type; 907 port->dev.release = &port_release; 908 device_initialize(&port->dev); 909 } 910 911 /* set up the endpoint information */ 912 for (i = 0; i < num_bulk_in; ++i) { 913 endpoint = bulk_in_endpoint[i]; 914 port = serial->port[i]; 915 buffer_size = max_t(int, serial->type->bulk_in_size, 916 usb_endpoint_maxp(endpoint)); 917 port->bulk_in_size = buffer_size; 918 port->bulk_in_endpointAddress = endpoint->bEndpointAddress; 919 920 for (j = 0; j < ARRAY_SIZE(port->read_urbs); ++j) { 921 set_bit(j, &port->read_urbs_free); 922 port->read_urbs[j] = usb_alloc_urb(0, GFP_KERNEL); 923 if (!port->read_urbs[j]) { 924 dev_err(&interface->dev, 925 "No free urbs available\n"); 926 goto probe_error; 927 } 928 port->bulk_in_buffers[j] = kmalloc(buffer_size, 929 GFP_KERNEL); 930 if (!port->bulk_in_buffers[j]) { 931 dev_err(&interface->dev, 932 "Couldn't allocate bulk_in_buffer\n"); 933 goto probe_error; 934 } 935 usb_fill_bulk_urb(port->read_urbs[j], dev, 936 usb_rcvbulkpipe(dev, 937 endpoint->bEndpointAddress), 938 port->bulk_in_buffers[j], buffer_size, 939 serial->type->read_bulk_callback, 940 port); 941 } 942 943 port->read_urb = port->read_urbs[0]; 944 port->bulk_in_buffer = port->bulk_in_buffers[0]; 945 } 946 947 for (i = 0; i < num_bulk_out; ++i) { 948 endpoint = bulk_out_endpoint[i]; 949 port = serial->port[i]; 950 if (kfifo_alloc(&port->write_fifo, PAGE_SIZE, GFP_KERNEL)) 951 goto probe_error; 952 buffer_size = serial->type->bulk_out_size; 953 if (!buffer_size) 954 buffer_size = usb_endpoint_maxp(endpoint); 955 port->bulk_out_size = buffer_size; 956 port->bulk_out_endpointAddress = endpoint->bEndpointAddress; 957 958 for (j = 0; j < ARRAY_SIZE(port->write_urbs); ++j) { 959 set_bit(j, &port->write_urbs_free); 960 port->write_urbs[j] = usb_alloc_urb(0, GFP_KERNEL); 961 if (!port->write_urbs[j]) { 962 dev_err(&interface->dev, 963 "No free urbs available\n"); 964 goto probe_error; 965 } 966 port->bulk_out_buffers[j] = kmalloc(buffer_size, 967 GFP_KERNEL); 968 if (!port->bulk_out_buffers[j]) { 969 dev_err(&interface->dev, 970 "Couldn't allocate bulk_out_buffer\n"); 971 goto probe_error; 972 } 973 usb_fill_bulk_urb(port->write_urbs[j], dev, 974 usb_sndbulkpipe(dev, 975 endpoint->bEndpointAddress), 976 port->bulk_out_buffers[j], buffer_size, 977 serial->type->write_bulk_callback, 978 port); 979 } 980 981 port->write_urb = port->write_urbs[0]; 982 port->bulk_out_buffer = port->bulk_out_buffers[0]; 983 } 984 985 if (serial->type->read_int_callback) { 986 for (i = 0; i < num_interrupt_in; ++i) { 987 endpoint = interrupt_in_endpoint[i]; 988 port = serial->port[i]; 989 port->interrupt_in_urb = usb_alloc_urb(0, GFP_KERNEL); 990 if (!port->interrupt_in_urb) { 991 dev_err(&interface->dev, 992 "No free urbs available\n"); 993 goto probe_error; 994 } 995 buffer_size = usb_endpoint_maxp(endpoint); 996 port->interrupt_in_endpointAddress = 997 endpoint->bEndpointAddress; 998 port->interrupt_in_buffer = kmalloc(buffer_size, 999 GFP_KERNEL); 1000 if (!port->interrupt_in_buffer) { 1001 dev_err(&interface->dev, 1002 "Couldn't allocate interrupt_in_buffer\n"); 1003 goto probe_error; 1004 } 1005 usb_fill_int_urb(port->interrupt_in_urb, dev, 1006 usb_rcvintpipe(dev, 1007 endpoint->bEndpointAddress), 1008 port->interrupt_in_buffer, buffer_size, 1009 serial->type->read_int_callback, port, 1010 endpoint->bInterval); 1011 } 1012 } else if (num_interrupt_in) { 1013 dbg("the device claims to support interrupt in transfers, but read_int_callback is not defined"); 1014 } 1015 1016 if (serial->type->write_int_callback) { 1017 for (i = 0; i < num_interrupt_out; ++i) { 1018 endpoint = interrupt_out_endpoint[i]; 1019 port = serial->port[i]; 1020 port->interrupt_out_urb = usb_alloc_urb(0, GFP_KERNEL); 1021 if (!port->interrupt_out_urb) { 1022 dev_err(&interface->dev, 1023 "No free urbs available\n"); 1024 goto probe_error; 1025 } 1026 buffer_size = usb_endpoint_maxp(endpoint); 1027 port->interrupt_out_size = buffer_size; 1028 port->interrupt_out_endpointAddress = 1029 endpoint->bEndpointAddress; 1030 port->interrupt_out_buffer = kmalloc(buffer_size, 1031 GFP_KERNEL); 1032 if (!port->interrupt_out_buffer) { 1033 dev_err(&interface->dev, 1034 "Couldn't allocate interrupt_out_buffer\n"); 1035 goto probe_error; 1036 } 1037 usb_fill_int_urb(port->interrupt_out_urb, dev, 1038 usb_sndintpipe(dev, 1039 endpoint->bEndpointAddress), 1040 port->interrupt_out_buffer, buffer_size, 1041 serial->type->write_int_callback, port, 1042 endpoint->bInterval); 1043 } 1044 } else if (num_interrupt_out) { 1045 dbg("the device claims to support interrupt out transfers, but write_int_callback is not defined"); 1046 } 1047 1048 /* if this device type has an attach function, call it */ 1049 if (type->attach) { 1050 retval = type->attach(serial); 1051 if (retval < 0) 1052 goto probe_error; 1053 serial->attached = 1; 1054 if (retval > 0) { 1055 /* quietly accept this device, but don't bind to a 1056 serial port as it's about to disappear */ 1057 serial->num_ports = 0; 1058 goto exit; 1059 } 1060 } else { 1061 serial->attached = 1; 1062 } 1063 1064 /* Avoid race with tty_open and serial_install by setting the 1065 * disconnected flag and not clearing it until all ports have been 1066 * registered. 1067 */ 1068 serial->disconnected = 1; 1069 1070 if (get_free_serial(serial, num_ports, &minor) == NULL) { 1071 dev_err(&interface->dev, "No more free serial devices\n"); 1072 goto probe_error; 1073 } 1074 serial->minor = minor; 1075 1076 /* register all of the individual ports with the driver core */ 1077 for (i = 0; i < num_ports; ++i) { 1078 port = serial->port[i]; 1079 dev_set_name(&port->dev, "ttyUSB%d", port->number); 1080 dbg ("%s - registering %s", __func__, dev_name(&port->dev)); 1081 device_enable_async_suspend(&port->dev); 1082 1083 retval = device_add(&port->dev); 1084 if (retval) 1085 dev_err(&port->dev, "Error registering port device, " 1086 "continuing\n"); 1087 } 1088 1089 serial->disconnected = 0; 1090 1091 usb_serial_console_init(debug, minor); 1092 1093exit: 1094 /* success */ 1095 usb_set_intfdata(interface, serial); 1096 module_put(type->driver.owner); 1097 return 0; 1098 1099probe_error: 1100 usb_serial_put(serial); 1101 module_put(type->driver.owner); 1102 return -EIO; 1103} 1104EXPORT_SYMBOL_GPL(usb_serial_probe); 1105 1106void usb_serial_disconnect(struct usb_interface *interface) 1107{ 1108 int i; 1109 struct usb_serial *serial = usb_get_intfdata(interface); 1110 struct device *dev = &interface->dev; 1111 struct usb_serial_port *port; 1112 1113 usb_serial_console_disconnect(serial); 1114 dbg("%s", __func__); 1115 1116 mutex_lock(&serial->disc_mutex); 1117 usb_set_intfdata(interface, NULL); 1118 /* must set a flag, to signal subdrivers */ 1119 serial->disconnected = 1; 1120 mutex_unlock(&serial->disc_mutex); 1121 1122 for (i = 0; i < serial->num_ports; ++i) { 1123 port = serial->port[i]; 1124 if (port) { 1125 struct tty_struct *tty = tty_port_tty_get(&port->port); 1126 if (tty) { 1127 tty_vhangup(tty); 1128 tty_kref_put(tty); 1129 } 1130 kill_traffic(port); 1131 cancel_work_sync(&port->work); 1132 if (device_is_registered(&port->dev)) 1133 device_del(&port->dev); 1134 } 1135 } 1136 serial->type->disconnect(serial); 1137 1138 /* let the last holder of this object cause it to be cleaned up */ 1139 usb_serial_put(serial); 1140 dev_info(dev, "device disconnected\n"); 1141} 1142EXPORT_SYMBOL_GPL(usb_serial_disconnect); 1143 1144int usb_serial_suspend(struct usb_interface *intf, pm_message_t message) 1145{ 1146 struct usb_serial *serial = usb_get_intfdata(intf); 1147 struct usb_serial_port *port; 1148 int i, r = 0; 1149 1150 serial->suspending = 1; 1151 1152 if (serial->type->suspend) { 1153 r = serial->type->suspend(serial, message); 1154 if (r < 0) { 1155 serial->suspending = 0; 1156 goto err_out; 1157 } 1158 } 1159 1160 for (i = 0; i < serial->num_ports; ++i) { 1161 port = serial->port[i]; 1162 if (port) 1163 kill_traffic(port); 1164 } 1165 1166err_out: 1167 return r; 1168} 1169EXPORT_SYMBOL(usb_serial_suspend); 1170 1171int usb_serial_resume(struct usb_interface *intf) 1172{ 1173 struct usb_serial *serial = usb_get_intfdata(intf); 1174 int rv; 1175 1176 serial->suspending = 0; 1177 if (serial->type->resume) 1178 rv = serial->type->resume(serial); 1179 else 1180 rv = usb_serial_generic_resume(serial); 1181 1182 return rv; 1183} 1184EXPORT_SYMBOL(usb_serial_resume); 1185 1186static const struct tty_operations serial_ops = { 1187 .open = serial_open, 1188 .close = serial_close, 1189 .write = serial_write, 1190 .hangup = serial_hangup, 1191 .write_room = serial_write_room, 1192 .ioctl = serial_ioctl, 1193 .set_termios = serial_set_termios, 1194 .throttle = serial_throttle, 1195 .unthrottle = serial_unthrottle, 1196 .break_ctl = serial_break, 1197 .chars_in_buffer = serial_chars_in_buffer, 1198 .tiocmget = serial_tiocmget, 1199 .tiocmset = serial_tiocmset, 1200 .get_icount = serial_get_icount, 1201 .cleanup = serial_cleanup, 1202 .install = serial_install, 1203 .proc_fops = &serial_proc_fops, 1204}; 1205 1206 1207struct tty_driver *usb_serial_tty_driver; 1208 1209static int __init usb_serial_init(void) 1210{ 1211 int i; 1212 int result; 1213 1214 usb_serial_tty_driver = alloc_tty_driver(SERIAL_TTY_MINORS); 1215 if (!usb_serial_tty_driver) 1216 return -ENOMEM; 1217 1218 /* Initialize our global data */ 1219 for (i = 0; i < SERIAL_TTY_MINORS; ++i) 1220 serial_table[i] = NULL; 1221 1222 result = bus_register(&usb_serial_bus_type); 1223 if (result) { 1224 printk(KERN_ERR "usb-serial: %s - registering bus driver " 1225 "failed\n", __func__); 1226 goto exit_bus; 1227 } 1228 1229 usb_serial_tty_driver->driver_name = "usbserial"; 1230 usb_serial_tty_driver->name = "ttyUSB"; 1231 usb_serial_tty_driver->major = SERIAL_TTY_MAJOR; 1232 usb_serial_tty_driver->minor_start = 0; 1233 usb_serial_tty_driver->type = TTY_DRIVER_TYPE_SERIAL; 1234 usb_serial_tty_driver->subtype = SERIAL_TYPE_NORMAL; 1235 usb_serial_tty_driver->flags = TTY_DRIVER_REAL_RAW | 1236 TTY_DRIVER_DYNAMIC_DEV; 1237 usb_serial_tty_driver->init_termios = tty_std_termios; 1238 usb_serial_tty_driver->init_termios.c_cflag = B9600 | CS8 | CREAD 1239 | HUPCL | CLOCAL; 1240 usb_serial_tty_driver->init_termios.c_ispeed = 9600; 1241 usb_serial_tty_driver->init_termios.c_ospeed = 9600; 1242 tty_set_operations(usb_serial_tty_driver, &serial_ops); 1243 result = tty_register_driver(usb_serial_tty_driver); 1244 if (result) { 1245 printk(KERN_ERR "usb-serial: %s - tty_register_driver failed\n", 1246 __func__); 1247 goto exit_reg_driver; 1248 } 1249 1250 /* register the USB driver */ 1251 result = usb_register(&usb_serial_driver); 1252 if (result < 0) { 1253 printk(KERN_ERR "usb-serial: %s - usb_register failed\n", 1254 __func__); 1255 goto exit_tty; 1256 } 1257 1258 /* register the generic driver, if we should */ 1259 result = usb_serial_generic_register(debug); 1260 if (result < 0) { 1261 printk(KERN_ERR "usb-serial: %s - registering generic " 1262 "driver failed\n", __func__); 1263 goto exit_generic; 1264 } 1265 1266 printk(KERN_INFO KBUILD_MODNAME ": " DRIVER_DESC "\n"); 1267 1268 return result; 1269 1270exit_generic: 1271 usb_deregister(&usb_serial_driver); 1272 1273exit_tty: 1274 tty_unregister_driver(usb_serial_tty_driver); 1275 1276exit_reg_driver: 1277 bus_unregister(&usb_serial_bus_type); 1278 1279exit_bus: 1280 printk(KERN_ERR "usb-serial: %s - returning with error %d\n", 1281 __func__, result); 1282 put_tty_driver(usb_serial_tty_driver); 1283 return result; 1284} 1285 1286 1287static void __exit usb_serial_exit(void) 1288{ 1289 usb_serial_console_exit(); 1290 1291 usb_serial_generic_deregister(); 1292 1293 usb_deregister(&usb_serial_driver); 1294 tty_unregister_driver(usb_serial_tty_driver); 1295 put_tty_driver(usb_serial_tty_driver); 1296 bus_unregister(&usb_serial_bus_type); 1297} 1298 1299 1300module_init(usb_serial_init); 1301module_exit(usb_serial_exit); 1302 1303#define set_to_generic_if_null(type, function) \ 1304 do { \ 1305 if (!type->function) { \ 1306 type->function = usb_serial_generic_##function; \ 1307 dbg("Had to override the " #function \ 1308 " usb serial operation with the generic one.");\ 1309 } \ 1310 } while (0) 1311 1312static void fixup_generic(struct usb_serial_driver *device) 1313{ 1314 set_to_generic_if_null(device, open); 1315 set_to_generic_if_null(device, write); 1316 set_to_generic_if_null(device, close); 1317 set_to_generic_if_null(device, write_room); 1318 set_to_generic_if_null(device, chars_in_buffer); 1319 set_to_generic_if_null(device, read_bulk_callback); 1320 set_to_generic_if_null(device, write_bulk_callback); 1321 set_to_generic_if_null(device, disconnect); 1322 set_to_generic_if_null(device, release); 1323 set_to_generic_if_null(device, process_read_urb); 1324 set_to_generic_if_null(device, prepare_write_buffer); 1325} 1326 1327static int usb_serial_register(struct usb_serial_driver *driver) 1328{ 1329 int retval; 1330 1331 if (usb_disabled()) 1332 return -ENODEV; 1333 1334 fixup_generic(driver); 1335 1336 if (!driver->description) 1337 driver->description = driver->driver.name; 1338 if (!driver->usb_driver) { 1339 WARN(1, "Serial driver %s has no usb_driver\n", 1340 driver->description); 1341 return -EINVAL; 1342 } 1343 1344 /* Add this device to our list of devices */ 1345 mutex_lock(&table_lock); 1346 list_add(&driver->driver_list, &usb_serial_driver_list); 1347 1348 retval = usb_serial_bus_register(driver); 1349 if (retval) { 1350 printk(KERN_ERR "usb-serial: problem %d when registering " 1351 "driver %s\n", retval, driver->description); 1352 list_del(&driver->driver_list); 1353 } else 1354 printk(KERN_INFO "USB Serial support registered for %s\n", 1355 driver->description); 1356 1357 mutex_unlock(&table_lock); 1358 return retval; 1359} 1360 1361static void usb_serial_deregister(struct usb_serial_driver *device) 1362{ 1363 printk(KERN_INFO "USB Serial deregistering driver %s\n", 1364 device->description); 1365 mutex_lock(&table_lock); 1366 list_del(&device->driver_list); 1367 usb_serial_bus_deregister(device); 1368 mutex_unlock(&table_lock); 1369} 1370 1371/** 1372 * usb_serial_register_drivers - register drivers for a usb-serial module 1373 * @udriver: usb_driver used for matching devices/interfaces 1374 * @serial_drivers: NULL-terminated array of pointers to drivers to be registered 1375 * 1376 * Registers @udriver and all the drivers in the @serial_drivers array. 1377 * Automatically fills in the .no_dynamic_id and PM fields in @udriver and 1378 * the .usb_driver field in each serial driver. 1379 */ 1380int usb_serial_register_drivers(struct usb_driver *udriver, 1381 struct usb_serial_driver * const serial_drivers[]) 1382{ 1383 int rc; 1384 const struct usb_device_id *saved_id_table; 1385 struct usb_serial_driver * const *sd; 1386 1387 /* 1388 * udriver must be registered before any of the serial drivers, 1389 * because the store_new_id() routine for the serial drivers (in 1390 * bus.c) probes udriver. 1391 * 1392 * Performance hack: We don't want udriver to be probed until 1393 * the serial drivers are registered, because the probe would 1394 * simply fail for lack of a matching serial driver. 1395 * Therefore save off udriver's id_table until we are all set. 1396 * 1397 * Suspend/resume support is implemented in the usb-serial core, 1398 * so fill in the PM-related fields in udriver. 1399 */ 1400 saved_id_table = udriver->id_table; 1401 udriver->id_table = NULL; 1402 1403 udriver->no_dynamic_id = 1; 1404 udriver->supports_autosuspend = 1; 1405 udriver->suspend = usb_serial_suspend; 1406 udriver->resume = usb_serial_resume; 1407 rc = usb_register(udriver); 1408 if (rc) 1409 return rc; 1410 1411 for (sd = serial_drivers; *sd; ++sd) { 1412 (*sd)->usb_driver = udriver; 1413 rc = usb_serial_register(*sd); 1414 if (rc) 1415 goto failed; 1416 } 1417 1418 /* Now restore udriver's id_table and look for matches */ 1419 udriver->id_table = saved_id_table; 1420 rc = driver_attach(&udriver->drvwrap.driver); 1421 return 0; 1422 1423 failed: 1424 while (sd-- > serial_drivers) 1425 usb_serial_deregister(*sd); 1426 usb_deregister(udriver); 1427 return rc; 1428} 1429EXPORT_SYMBOL_GPL(usb_serial_register_drivers); 1430 1431/** 1432 * usb_serial_deregister_drivers - deregister drivers for a usb-serial module 1433 * @udriver: usb_driver to unregister 1434 * @serial_drivers: NULL-terminated array of pointers to drivers to be deregistered 1435 * 1436 * Deregisters @udriver and all the drivers in the @serial_drivers array. 1437 */ 1438void usb_serial_deregister_drivers(struct usb_driver *udriver, 1439 struct usb_serial_driver * const serial_drivers[]) 1440{ 1441 for (; *serial_drivers; ++serial_drivers) 1442 usb_serial_deregister(*serial_drivers); 1443 usb_deregister(udriver); 1444} 1445EXPORT_SYMBOL_GPL(usb_serial_deregister_drivers); 1446 1447/* Module information */ 1448MODULE_AUTHOR(DRIVER_AUTHOR); 1449MODULE_DESCRIPTION(DRIVER_DESC); 1450MODULE_LICENSE("GPL"); 1451 1452module_param(debug, bool, S_IRUGO | S_IWUSR); 1453MODULE_PARM_DESC(debug, "Debug enabled or not"); 1454