1 /* 2 * USB Serial Converter driver 3 * 4 * Copyright (C) 2009 - 2013 Johan Hovold (jhovold@gmail.com) 5 * Copyright (C) 1999 - 2012 Greg Kroah-Hartman (greg@kroah.com) 6 * Copyright (C) 2000 Peter Berger (pberger@brimson.com) 7 * Copyright (C) 2000 Al Borchers (borchers@steinerpoint.com) 8 * 9 * This program is free software; you can redistribute it and/or 10 * modify it under the terms of the GNU General Public License version 11 * 2 as published by the Free Software Foundation. 12 * 13 * This driver was originally based on the ACM driver by Armin Fuerst (which was 14 * based on a driver by Brad Keryan) 15 * 16 * See Documentation/usb/usb-serial.txt for more information on using this 17 * driver 18 */ 19 20 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt 21 22 #include <linux/kernel.h> 23 #include <linux/errno.h> 24 #include <linux/init.h> 25 #include <linux/slab.h> 26 #include <linux/tty.h> 27 #include <linux/tty_driver.h> 28 #include <linux/tty_flip.h> 29 #include <linux/module.h> 30 #include <linux/moduleparam.h> 31 #include <linux/seq_file.h> 32 #include <linux/spinlock.h> 33 #include <linux/mutex.h> 34 #include <linux/list.h> 35 #include <linux/uaccess.h> 36 #include <linux/serial.h> 37 #include <linux/usb.h> 38 #include <linux/usb/serial.h> 39 #include <linux/kfifo.h> 40 #include <linux/idr.h> 41 #include "pl2303.h" 42 43 #define DRIVER_AUTHOR "Greg Kroah-Hartman <gregkh@linuxfoundation.org>" 44 #define DRIVER_DESC "USB Serial Driver core" 45 46 #define USB_SERIAL_TTY_MAJOR 188 47 #define USB_SERIAL_TTY_MINORS 512 /* should be enough for a while */ 48 49 /* There is no MODULE_DEVICE_TABLE for usbserial.c. Instead 50 the MODULE_DEVICE_TABLE declarations in each serial driver 51 cause the "hotplug" program to pull in whatever module is necessary 52 via modprobe, and modprobe will load usbserial because the serial 53 drivers depend on it. 54 */ 55 56 static DEFINE_IDR(serial_minors); 57 static DEFINE_MUTEX(table_lock); 58 static LIST_HEAD(usb_serial_driver_list); 59 60 /* 61 * Look up the serial port structure. If it is found and it hasn't been 62 * disconnected, return with the parent usb_serial structure's disc_mutex held 63 * and its refcount incremented. Otherwise return NULL. 64 */ 65 struct usb_serial_port *usb_serial_port_get_by_minor(unsigned minor) 66 { 67 struct usb_serial *serial; 68 struct usb_serial_port *port; 69 70 mutex_lock(&table_lock); 71 port = idr_find(&serial_minors, minor); 72 if (!port) 73 goto exit; 74 75 serial = port->serial; 76 mutex_lock(&serial->disc_mutex); 77 if (serial->disconnected) { 78 mutex_unlock(&serial->disc_mutex); 79 port = NULL; 80 } else { 81 kref_get(&serial->kref); 82 } 83 exit: 84 mutex_unlock(&table_lock); 85 return port; 86 } 87 88 static int allocate_minors(struct usb_serial *serial, int num_ports) 89 { 90 struct usb_serial_port *port; 91 unsigned int i, j; 92 int minor; 93 94 dev_dbg(&serial->interface->dev, "%s %d\n", __func__, num_ports); 95 96 mutex_lock(&table_lock); 97 for (i = 0; i < num_ports; ++i) { 98 port = serial->port[i]; 99 minor = idr_alloc(&serial_minors, port, 0, 0, GFP_KERNEL); 100 if (minor < 0) 101 goto error; 102 port->minor = minor; 103 port->port_number = i; 104 } 105 serial->minors_reserved = 1; 106 mutex_unlock(&table_lock); 107 return 0; 108 error: 109 /* unwind the already allocated minors */ 110 for (j = 0; j < i; ++j) 111 idr_remove(&serial_minors, serial->port[j]->minor); 112 mutex_unlock(&table_lock); 113 return minor; 114 } 115 116 static void release_minors(struct usb_serial *serial) 117 { 118 int i; 119 120 mutex_lock(&table_lock); 121 for (i = 0; i < serial->num_ports; ++i) 122 idr_remove(&serial_minors, serial->port[i]->minor); 123 mutex_unlock(&table_lock); 124 serial->minors_reserved = 0; 125 } 126 127 static void destroy_serial(struct kref *kref) 128 { 129 struct usb_serial *serial; 130 struct usb_serial_port *port; 131 int i; 132 133 serial = to_usb_serial(kref); 134 135 /* return the minor range that this device had */ 136 if (serial->minors_reserved) 137 release_minors(serial); 138 139 if (serial->attached && serial->type->release) 140 serial->type->release(serial); 141 142 /* Now that nothing is using the ports, they can be freed */ 143 for (i = 0; i < serial->num_port_pointers; ++i) { 144 port = serial->port[i]; 145 if (port) { 146 port->serial = NULL; 147 put_device(&port->dev); 148 } 149 } 150 151 usb_put_intf(serial->interface); 152 usb_put_dev(serial->dev); 153 kfree(serial); 154 } 155 156 void usb_serial_put(struct usb_serial *serial) 157 { 158 kref_put(&serial->kref, destroy_serial); 159 } 160 161 /***************************************************************************** 162 * Driver tty interface functions 163 *****************************************************************************/ 164 165 /** 166 * serial_install - install tty 167 * @driver: the driver (USB in our case) 168 * @tty: the tty being created 169 * 170 * Create the termios objects for this tty. We use the default 171 * USB serial settings but permit them to be overridden by 172 * serial->type->init_termios. 173 * 174 * This is the first place a new tty gets used. Hence this is where we 175 * acquire references to the usb_serial structure and the driver module, 176 * where we store a pointer to the port, and where we do an autoresume. 177 * All these actions are reversed in serial_cleanup(). 178 */ 179 static int serial_install(struct tty_driver *driver, struct tty_struct *tty) 180 { 181 int idx = tty->index; 182 struct usb_serial *serial; 183 struct usb_serial_port *port; 184 int retval = -ENODEV; 185 186 port = usb_serial_port_get_by_minor(idx); 187 if (!port) 188 return retval; 189 190 serial = port->serial; 191 if (!try_module_get(serial->type->driver.owner)) 192 goto error_module_get; 193 194 retval = usb_autopm_get_interface(serial->interface); 195 if (retval) 196 goto error_get_interface; 197 198 retval = tty_port_install(&port->port, driver, tty); 199 if (retval) 200 goto error_init_termios; 201 202 mutex_unlock(&serial->disc_mutex); 203 204 /* allow the driver to update the settings */ 205 if (serial->type->init_termios) 206 serial->type->init_termios(tty); 207 208 tty->driver_data = port; 209 210 return retval; 211 212 error_init_termios: 213 usb_autopm_put_interface(serial->interface); 214 error_get_interface: 215 module_put(serial->type->driver.owner); 216 error_module_get: 217 usb_serial_put(serial); 218 mutex_unlock(&serial->disc_mutex); 219 return retval; 220 } 221 222 static int serial_port_activate(struct tty_port *tport, struct tty_struct *tty) 223 { 224 struct usb_serial_port *port = 225 container_of(tport, struct usb_serial_port, port); 226 struct usb_serial *serial = port->serial; 227 int retval; 228 229 mutex_lock(&serial->disc_mutex); 230 if (serial->disconnected) 231 retval = -ENODEV; 232 else 233 retval = port->serial->type->open(tty, port); 234 mutex_unlock(&serial->disc_mutex); 235 236 if (retval < 0) 237 retval = usb_translate_errors(retval); 238 239 return retval; 240 } 241 242 static int serial_open(struct tty_struct *tty, struct file *filp) 243 { 244 struct usb_serial_port *port = tty->driver_data; 245 246 dev_dbg(tty->dev, "%s\n", __func__); 247 248 return tty_port_open(&port->port, tty, filp); 249 } 250 251 /** 252 * serial_port_shutdown - shut down hardware 253 * @tport: tty port to shut down 254 * 255 * Shut down a USB serial port. Serialized against activate by the 256 * tport mutex and kept to matching open/close pairs 257 * of calls by the ASYNCB_INITIALIZED flag. 258 * 259 * Not called if tty is console. 260 */ 261 static void serial_port_shutdown(struct tty_port *tport) 262 { 263 struct usb_serial_port *port = 264 container_of(tport, struct usb_serial_port, port); 265 struct usb_serial_driver *drv = port->serial->type; 266 267 if (drv->close) 268 drv->close(port); 269 } 270 271 static void serial_hangup(struct tty_struct *tty) 272 { 273 struct usb_serial_port *port = tty->driver_data; 274 275 dev_dbg(tty->dev, "%s\n", __func__); 276 277 tty_port_hangup(&port->port); 278 } 279 280 static void serial_close(struct tty_struct *tty, struct file *filp) 281 { 282 struct usb_serial_port *port = tty->driver_data; 283 284 dev_dbg(tty->dev, "%s\n", __func__); 285 286 tty_port_close(&port->port, tty, filp); 287 } 288 289 /** 290 * serial_cleanup - free resources post close/hangup 291 * @port: port to free up 292 * 293 * Do the resource freeing and refcount dropping for the port. 294 * Avoid freeing the console. 295 * 296 * Called asynchronously after the last tty kref is dropped. 297 */ 298 static void serial_cleanup(struct tty_struct *tty) 299 { 300 struct usb_serial_port *port = tty->driver_data; 301 struct usb_serial *serial; 302 struct module *owner; 303 304 dev_dbg(tty->dev, "%s\n", __func__); 305 306 /* The console is magical. Do not hang up the console hardware 307 * or there will be tears. 308 */ 309 if (port->port.console) 310 return; 311 312 tty->driver_data = NULL; 313 314 serial = port->serial; 315 owner = serial->type->driver.owner; 316 317 mutex_lock(&serial->disc_mutex); 318 if (!serial->disconnected) 319 usb_autopm_put_interface(serial->interface); 320 mutex_unlock(&serial->disc_mutex); 321 322 usb_serial_put(serial); 323 module_put(owner); 324 } 325 326 static int serial_write(struct tty_struct *tty, const unsigned char *buf, 327 int count) 328 { 329 struct usb_serial_port *port = tty->driver_data; 330 int retval = -ENODEV; 331 332 if (port->serial->dev->state == USB_STATE_NOTATTACHED) 333 goto exit; 334 335 dev_dbg(tty->dev, "%s - %d byte(s)\n", __func__, count); 336 337 retval = port->serial->type->write(tty, port, buf, count); 338 if (retval < 0) 339 retval = usb_translate_errors(retval); 340 exit: 341 return retval; 342 } 343 344 static int serial_write_room(struct tty_struct *tty) 345 { 346 struct usb_serial_port *port = tty->driver_data; 347 348 dev_dbg(tty->dev, "%s\n", __func__); 349 350 return port->serial->type->write_room(tty); 351 } 352 353 static int serial_chars_in_buffer(struct tty_struct *tty) 354 { 355 struct usb_serial_port *port = tty->driver_data; 356 struct usb_serial *serial = port->serial; 357 358 dev_dbg(tty->dev, "%s\n", __func__); 359 360 if (serial->disconnected) 361 return 0; 362 363 return serial->type->chars_in_buffer(tty); 364 } 365 366 static void serial_wait_until_sent(struct tty_struct *tty, int timeout) 367 { 368 struct usb_serial_port *port = tty->driver_data; 369 struct usb_serial *serial = port->serial; 370 371 dev_dbg(tty->dev, "%s\n", __func__); 372 373 if (!port->serial->type->wait_until_sent) 374 return; 375 376 mutex_lock(&serial->disc_mutex); 377 if (!serial->disconnected) 378 port->serial->type->wait_until_sent(tty, timeout); 379 mutex_unlock(&serial->disc_mutex); 380 } 381 382 static void serial_throttle(struct tty_struct *tty) 383 { 384 struct usb_serial_port *port = tty->driver_data; 385 386 dev_dbg(tty->dev, "%s\n", __func__); 387 388 if (port->serial->type->throttle) 389 port->serial->type->throttle(tty); 390 } 391 392 static void serial_unthrottle(struct tty_struct *tty) 393 { 394 struct usb_serial_port *port = tty->driver_data; 395 396 dev_dbg(tty->dev, "%s\n", __func__); 397 398 if (port->serial->type->unthrottle) 399 port->serial->type->unthrottle(tty); 400 } 401 402 static int serial_ioctl(struct tty_struct *tty, 403 unsigned int cmd, unsigned long arg) 404 { 405 struct usb_serial_port *port = tty->driver_data; 406 int retval = -ENOIOCTLCMD; 407 408 dev_dbg(tty->dev, "%s - cmd 0x%04x\n", __func__, cmd); 409 410 switch (cmd) { 411 case TIOCMIWAIT: 412 if (port->serial->type->tiocmiwait) 413 retval = port->serial->type->tiocmiwait(tty, arg); 414 break; 415 default: 416 if (port->serial->type->ioctl) 417 retval = port->serial->type->ioctl(tty, cmd, arg); 418 } 419 420 return retval; 421 } 422 423 static void serial_set_termios(struct tty_struct *tty, struct ktermios *old) 424 { 425 struct usb_serial_port *port = tty->driver_data; 426 427 dev_dbg(tty->dev, "%s\n", __func__); 428 429 if (port->serial->type->set_termios) 430 port->serial->type->set_termios(tty, port, old); 431 else 432 tty_termios_copy_hw(&tty->termios, old); 433 } 434 435 static int serial_break(struct tty_struct *tty, int break_state) 436 { 437 struct usb_serial_port *port = tty->driver_data; 438 439 dev_dbg(tty->dev, "%s\n", __func__); 440 441 if (port->serial->type->break_ctl) 442 port->serial->type->break_ctl(tty, break_state); 443 444 return 0; 445 } 446 447 static int serial_proc_show(struct seq_file *m, void *v) 448 { 449 struct usb_serial *serial; 450 struct usb_serial_port *port; 451 int i; 452 char tmp[40]; 453 454 seq_puts(m, "usbserinfo:1.0 driver:2.0\n"); 455 for (i = 0; i < USB_SERIAL_TTY_MINORS; ++i) { 456 port = usb_serial_port_get_by_minor(i); 457 if (port == NULL) 458 continue; 459 serial = port->serial; 460 461 seq_printf(m, "%d:", i); 462 if (serial->type->driver.owner) 463 seq_printf(m, " module:%s", 464 module_name(serial->type->driver.owner)); 465 seq_printf(m, " name:\"%s\"", 466 serial->type->description); 467 seq_printf(m, " vendor:%04x product:%04x", 468 le16_to_cpu(serial->dev->descriptor.idVendor), 469 le16_to_cpu(serial->dev->descriptor.idProduct)); 470 seq_printf(m, " num_ports:%d", serial->num_ports); 471 seq_printf(m, " port:%d", port->port_number); 472 usb_make_path(serial->dev, tmp, sizeof(tmp)); 473 seq_printf(m, " path:%s", tmp); 474 475 seq_putc(m, '\n'); 476 usb_serial_put(serial); 477 mutex_unlock(&serial->disc_mutex); 478 } 479 return 0; 480 } 481 482 static int serial_proc_open(struct inode *inode, struct file *file) 483 { 484 return single_open(file, serial_proc_show, NULL); 485 } 486 487 static const struct file_operations serial_proc_fops = { 488 .owner = THIS_MODULE, 489 .open = serial_proc_open, 490 .read = seq_read, 491 .llseek = seq_lseek, 492 .release = single_release, 493 }; 494 495 static int serial_tiocmget(struct tty_struct *tty) 496 { 497 struct usb_serial_port *port = tty->driver_data; 498 499 dev_dbg(tty->dev, "%s\n", __func__); 500 501 if (port->serial->type->tiocmget) 502 return port->serial->type->tiocmget(tty); 503 return -EINVAL; 504 } 505 506 static int serial_tiocmset(struct tty_struct *tty, 507 unsigned int set, unsigned int clear) 508 { 509 struct usb_serial_port *port = tty->driver_data; 510 511 dev_dbg(tty->dev, "%s\n", __func__); 512 513 if (port->serial->type->tiocmset) 514 return port->serial->type->tiocmset(tty, set, clear); 515 return -EINVAL; 516 } 517 518 static int serial_get_icount(struct tty_struct *tty, 519 struct serial_icounter_struct *icount) 520 { 521 struct usb_serial_port *port = tty->driver_data; 522 523 dev_dbg(tty->dev, "%s\n", __func__); 524 525 if (port->serial->type->get_icount) 526 return port->serial->type->get_icount(tty, icount); 527 return -EINVAL; 528 } 529 530 /* 531 * We would be calling tty_wakeup here, but unfortunately some line 532 * disciplines have an annoying habit of calling tty->write from 533 * the write wakeup callback (e.g. n_hdlc.c). 534 */ 535 void usb_serial_port_softint(struct usb_serial_port *port) 536 { 537 schedule_work(&port->work); 538 } 539 EXPORT_SYMBOL_GPL(usb_serial_port_softint); 540 541 static void usb_serial_port_work(struct work_struct *work) 542 { 543 struct usb_serial_port *port = 544 container_of(work, struct usb_serial_port, work); 545 546 tty_port_tty_wakeup(&port->port); 547 } 548 549 static void usb_serial_port_poison_urbs(struct usb_serial_port *port) 550 { 551 int i; 552 553 for (i = 0; i < ARRAY_SIZE(port->read_urbs); ++i) 554 usb_poison_urb(port->read_urbs[i]); 555 for (i = 0; i < ARRAY_SIZE(port->write_urbs); ++i) 556 usb_poison_urb(port->write_urbs[i]); 557 558 usb_poison_urb(port->interrupt_in_urb); 559 usb_poison_urb(port->interrupt_out_urb); 560 } 561 562 static void usb_serial_port_unpoison_urbs(struct usb_serial_port *port) 563 { 564 int i; 565 566 for (i = 0; i < ARRAY_SIZE(port->read_urbs); ++i) 567 usb_unpoison_urb(port->read_urbs[i]); 568 for (i = 0; i < ARRAY_SIZE(port->write_urbs); ++i) 569 usb_unpoison_urb(port->write_urbs[i]); 570 571 usb_unpoison_urb(port->interrupt_in_urb); 572 usb_unpoison_urb(port->interrupt_out_urb); 573 } 574 575 static void usb_serial_port_release(struct device *dev) 576 { 577 struct usb_serial_port *port = to_usb_serial_port(dev); 578 int i; 579 580 dev_dbg(dev, "%s\n", __func__); 581 582 usb_free_urb(port->interrupt_in_urb); 583 usb_free_urb(port->interrupt_out_urb); 584 for (i = 0; i < ARRAY_SIZE(port->read_urbs); ++i) { 585 usb_free_urb(port->read_urbs[i]); 586 kfree(port->bulk_in_buffers[i]); 587 } 588 for (i = 0; i < ARRAY_SIZE(port->write_urbs); ++i) { 589 usb_free_urb(port->write_urbs[i]); 590 kfree(port->bulk_out_buffers[i]); 591 } 592 kfifo_free(&port->write_fifo); 593 kfree(port->interrupt_in_buffer); 594 kfree(port->interrupt_out_buffer); 595 tty_port_destroy(&port->port); 596 kfree(port); 597 } 598 599 static struct usb_serial *create_serial(struct usb_device *dev, 600 struct usb_interface *interface, 601 struct usb_serial_driver *driver) 602 { 603 struct usb_serial *serial; 604 605 serial = kzalloc(sizeof(*serial), GFP_KERNEL); 606 if (!serial) 607 return NULL; 608 serial->dev = usb_get_dev(dev); 609 serial->type = driver; 610 serial->interface = usb_get_intf(interface); 611 kref_init(&serial->kref); 612 mutex_init(&serial->disc_mutex); 613 serial->minors_reserved = 0; 614 615 return serial; 616 } 617 618 static const struct usb_device_id *match_dynamic_id(struct usb_interface *intf, 619 struct usb_serial_driver *drv) 620 { 621 struct usb_dynid *dynid; 622 623 spin_lock(&drv->dynids.lock); 624 list_for_each_entry(dynid, &drv->dynids.list, node) { 625 if (usb_match_one_id(intf, &dynid->id)) { 626 spin_unlock(&drv->dynids.lock); 627 return &dynid->id; 628 } 629 } 630 spin_unlock(&drv->dynids.lock); 631 return NULL; 632 } 633 634 static const struct usb_device_id *get_iface_id(struct usb_serial_driver *drv, 635 struct usb_interface *intf) 636 { 637 const struct usb_device_id *id; 638 639 id = usb_match_id(intf, drv->id_table); 640 if (id) { 641 dev_dbg(&intf->dev, "static descriptor matches\n"); 642 goto exit; 643 } 644 id = match_dynamic_id(intf, drv); 645 if (id) 646 dev_dbg(&intf->dev, "dynamic descriptor matches\n"); 647 exit: 648 return id; 649 } 650 651 /* Caller must hold table_lock */ 652 static struct usb_serial_driver *search_serial_device( 653 struct usb_interface *iface) 654 { 655 const struct usb_device_id *id = NULL; 656 struct usb_serial_driver *drv; 657 struct usb_driver *driver = to_usb_driver(iface->dev.driver); 658 659 /* Check if the usb id matches a known device */ 660 list_for_each_entry(drv, &usb_serial_driver_list, driver_list) { 661 if (drv->usb_driver == driver) 662 id = get_iface_id(drv, iface); 663 if (id) 664 return drv; 665 } 666 667 return NULL; 668 } 669 670 static int serial_port_carrier_raised(struct tty_port *port) 671 { 672 struct usb_serial_port *p = container_of(port, struct usb_serial_port, port); 673 struct usb_serial_driver *drv = p->serial->type; 674 675 if (drv->carrier_raised) 676 return drv->carrier_raised(p); 677 /* No carrier control - don't block */ 678 return 1; 679 } 680 681 static void serial_port_dtr_rts(struct tty_port *port, int on) 682 { 683 struct usb_serial_port *p = container_of(port, struct usb_serial_port, port); 684 struct usb_serial_driver *drv = p->serial->type; 685 686 if (drv->dtr_rts) 687 drv->dtr_rts(p, on); 688 } 689 690 static ssize_t port_number_show(struct device *dev, 691 struct device_attribute *attr, char *buf) 692 { 693 struct usb_serial_port *port = to_usb_serial_port(dev); 694 695 return sprintf(buf, "%u\n", port->port_number); 696 } 697 static DEVICE_ATTR_RO(port_number); 698 699 static struct attribute *usb_serial_port_attrs[] = { 700 &dev_attr_port_number.attr, 701 NULL 702 }; 703 ATTRIBUTE_GROUPS(usb_serial_port); 704 705 static const struct tty_port_operations serial_port_ops = { 706 .carrier_raised = serial_port_carrier_raised, 707 .dtr_rts = serial_port_dtr_rts, 708 .activate = serial_port_activate, 709 .shutdown = serial_port_shutdown, 710 }; 711 712 static int usb_serial_probe(struct usb_interface *interface, 713 const struct usb_device_id *id) 714 { 715 struct device *ddev = &interface->dev; 716 struct usb_device *dev = interface_to_usbdev(interface); 717 struct usb_serial *serial = NULL; 718 struct usb_serial_port *port; 719 struct usb_host_interface *iface_desc; 720 struct usb_endpoint_descriptor *endpoint; 721 struct usb_endpoint_descriptor *interrupt_in_endpoint[MAX_NUM_PORTS]; 722 struct usb_endpoint_descriptor *interrupt_out_endpoint[MAX_NUM_PORTS]; 723 struct usb_endpoint_descriptor *bulk_in_endpoint[MAX_NUM_PORTS]; 724 struct usb_endpoint_descriptor *bulk_out_endpoint[MAX_NUM_PORTS]; 725 struct usb_serial_driver *type = NULL; 726 int retval; 727 int buffer_size; 728 int i; 729 int j; 730 int num_interrupt_in = 0; 731 int num_interrupt_out = 0; 732 int num_bulk_in = 0; 733 int num_bulk_out = 0; 734 int num_ports = 0; 735 int max_endpoints; 736 737 mutex_lock(&table_lock); 738 type = search_serial_device(interface); 739 if (!type) { 740 mutex_unlock(&table_lock); 741 dev_dbg(ddev, "none matched\n"); 742 return -ENODEV; 743 } 744 745 if (!try_module_get(type->driver.owner)) { 746 mutex_unlock(&table_lock); 747 dev_err(ddev, "module get failed, exiting\n"); 748 return -EIO; 749 } 750 mutex_unlock(&table_lock); 751 752 serial = create_serial(dev, interface, type); 753 if (!serial) { 754 module_put(type->driver.owner); 755 return -ENOMEM; 756 } 757 758 /* if this device type has a probe function, call it */ 759 if (type->probe) { 760 const struct usb_device_id *id; 761 762 id = get_iface_id(type, interface); 763 retval = type->probe(serial, id); 764 765 if (retval) { 766 dev_dbg(ddev, "sub driver rejected device\n"); 767 usb_serial_put(serial); 768 module_put(type->driver.owner); 769 return retval; 770 } 771 } 772 773 /* descriptor matches, let's find the endpoints needed */ 774 /* check out the endpoints */ 775 iface_desc = interface->cur_altsetting; 776 for (i = 0; i < iface_desc->desc.bNumEndpoints; ++i) { 777 endpoint = &iface_desc->endpoint[i].desc; 778 779 if (usb_endpoint_is_bulk_in(endpoint)) { 780 /* we found a bulk in endpoint */ 781 dev_dbg(ddev, "found bulk in on endpoint %d\n", i); 782 if (num_bulk_in < MAX_NUM_PORTS) { 783 bulk_in_endpoint[num_bulk_in] = endpoint; 784 ++num_bulk_in; 785 } 786 } 787 788 if (usb_endpoint_is_bulk_out(endpoint)) { 789 /* we found a bulk out endpoint */ 790 dev_dbg(ddev, "found bulk out on endpoint %d\n", i); 791 if (num_bulk_out < MAX_NUM_PORTS) { 792 bulk_out_endpoint[num_bulk_out] = endpoint; 793 ++num_bulk_out; 794 } 795 } 796 797 if (usb_endpoint_is_int_in(endpoint)) { 798 /* we found a interrupt in endpoint */ 799 dev_dbg(ddev, "found interrupt in on endpoint %d\n", i); 800 if (num_interrupt_in < MAX_NUM_PORTS) { 801 interrupt_in_endpoint[num_interrupt_in] = 802 endpoint; 803 ++num_interrupt_in; 804 } 805 } 806 807 if (usb_endpoint_is_int_out(endpoint)) { 808 /* we found an interrupt out endpoint */ 809 dev_dbg(ddev, "found interrupt out on endpoint %d\n", i); 810 if (num_interrupt_out < MAX_NUM_PORTS) { 811 interrupt_out_endpoint[num_interrupt_out] = 812 endpoint; 813 ++num_interrupt_out; 814 } 815 } 816 } 817 818 #if defined(CONFIG_USB_SERIAL_PL2303) || defined(CONFIG_USB_SERIAL_PL2303_MODULE) 819 /* BEGIN HORRIBLE HACK FOR PL2303 */ 820 /* this is needed due to the looney way its endpoints are set up */ 821 if (((le16_to_cpu(dev->descriptor.idVendor) == PL2303_VENDOR_ID) && 822 (le16_to_cpu(dev->descriptor.idProduct) == PL2303_PRODUCT_ID)) || 823 ((le16_to_cpu(dev->descriptor.idVendor) == ATEN_VENDOR_ID) && 824 (le16_to_cpu(dev->descriptor.idProduct) == ATEN_PRODUCT_ID)) || 825 ((le16_to_cpu(dev->descriptor.idVendor) == ALCOR_VENDOR_ID) && 826 (le16_to_cpu(dev->descriptor.idProduct) == ALCOR_PRODUCT_ID)) || 827 ((le16_to_cpu(dev->descriptor.idVendor) == SIEMENS_VENDOR_ID) && 828 (le16_to_cpu(dev->descriptor.idProduct) == SIEMENS_PRODUCT_ID_EF81))) { 829 if (interface != dev->actconfig->interface[0]) { 830 /* check out the endpoints of the other interface*/ 831 iface_desc = dev->actconfig->interface[0]->cur_altsetting; 832 for (i = 0; i < iface_desc->desc.bNumEndpoints; ++i) { 833 endpoint = &iface_desc->endpoint[i].desc; 834 if (usb_endpoint_is_int_in(endpoint)) { 835 /* we found a interrupt in endpoint */ 836 dev_dbg(ddev, "found interrupt in for Prolific device on separate interface\n"); 837 if (num_interrupt_in < MAX_NUM_PORTS) { 838 interrupt_in_endpoint[num_interrupt_in] = endpoint; 839 ++num_interrupt_in; 840 } 841 } 842 } 843 } 844 845 /* Now make sure the PL-2303 is configured correctly. 846 * If not, give up now and hope this hack will work 847 * properly during a later invocation of usb_serial_probe 848 */ 849 if (num_bulk_in == 0 || num_bulk_out == 0) { 850 dev_info(ddev, "PL-2303 hack: descriptors matched but endpoints did not\n"); 851 usb_serial_put(serial); 852 module_put(type->driver.owner); 853 return -ENODEV; 854 } 855 } 856 /* END HORRIBLE HACK FOR PL2303 */ 857 #endif 858 859 #ifdef CONFIG_USB_SERIAL_GENERIC 860 if (type == &usb_serial_generic_device) { 861 num_ports = num_bulk_out; 862 if (num_ports == 0) { 863 dev_err(ddev, "Generic device with no bulk out, not allowed.\n"); 864 usb_serial_put(serial); 865 module_put(type->driver.owner); 866 return -EIO; 867 } 868 dev_info(ddev, "The \"generic\" usb-serial driver is only for testing and one-off prototypes.\n"); 869 dev_info(ddev, "Tell linux-usb@vger.kernel.org to add your device to a proper driver.\n"); 870 } 871 #endif 872 if (!num_ports) { 873 /* if this device type has a calc_num_ports function, call it */ 874 if (type->calc_num_ports) 875 num_ports = type->calc_num_ports(serial); 876 if (!num_ports) 877 num_ports = type->num_ports; 878 } 879 880 if (num_ports > MAX_NUM_PORTS) { 881 dev_warn(ddev, "too many ports requested: %d\n", num_ports); 882 num_ports = MAX_NUM_PORTS; 883 } 884 885 serial->num_ports = num_ports; 886 serial->num_bulk_in = num_bulk_in; 887 serial->num_bulk_out = num_bulk_out; 888 serial->num_interrupt_in = num_interrupt_in; 889 serial->num_interrupt_out = num_interrupt_out; 890 891 /* found all that we need */ 892 dev_info(ddev, "%s converter detected\n", type->description); 893 894 /* create our ports, we need as many as the max endpoints */ 895 /* we don't use num_ports here because some devices have more 896 endpoint pairs than ports */ 897 max_endpoints = max(num_bulk_in, num_bulk_out); 898 max_endpoints = max(max_endpoints, num_interrupt_in); 899 max_endpoints = max(max_endpoints, num_interrupt_out); 900 max_endpoints = max(max_endpoints, (int)serial->num_ports); 901 serial->num_port_pointers = max_endpoints; 902 903 dev_dbg(ddev, "setting up %d port structure(s)\n", max_endpoints); 904 for (i = 0; i < max_endpoints; ++i) { 905 port = kzalloc(sizeof(struct usb_serial_port), GFP_KERNEL); 906 if (!port) 907 goto probe_error; 908 tty_port_init(&port->port); 909 port->port.ops = &serial_port_ops; 910 port->serial = serial; 911 spin_lock_init(&port->lock); 912 /* Keep this for private driver use for the moment but 913 should probably go away */ 914 INIT_WORK(&port->work, usb_serial_port_work); 915 serial->port[i] = port; 916 port->dev.parent = &interface->dev; 917 port->dev.driver = NULL; 918 port->dev.bus = &usb_serial_bus_type; 919 port->dev.release = &usb_serial_port_release; 920 port->dev.groups = usb_serial_port_groups; 921 device_initialize(&port->dev); 922 } 923 924 /* set up the endpoint information */ 925 for (i = 0; i < num_bulk_in; ++i) { 926 endpoint = bulk_in_endpoint[i]; 927 port = serial->port[i]; 928 buffer_size = max_t(int, serial->type->bulk_in_size, 929 usb_endpoint_maxp(endpoint)); 930 port->bulk_in_size = buffer_size; 931 port->bulk_in_endpointAddress = endpoint->bEndpointAddress; 932 933 for (j = 0; j < ARRAY_SIZE(port->read_urbs); ++j) { 934 set_bit(j, &port->read_urbs_free); 935 port->read_urbs[j] = usb_alloc_urb(0, GFP_KERNEL); 936 if (!port->read_urbs[j]) 937 goto probe_error; 938 port->bulk_in_buffers[j] = kmalloc(buffer_size, 939 GFP_KERNEL); 940 if (!port->bulk_in_buffers[j]) 941 goto probe_error; 942 usb_fill_bulk_urb(port->read_urbs[j], dev, 943 usb_rcvbulkpipe(dev, 944 endpoint->bEndpointAddress), 945 port->bulk_in_buffers[j], buffer_size, 946 serial->type->read_bulk_callback, 947 port); 948 } 949 950 port->read_urb = port->read_urbs[0]; 951 port->bulk_in_buffer = port->bulk_in_buffers[0]; 952 } 953 954 for (i = 0; i < num_bulk_out; ++i) { 955 endpoint = bulk_out_endpoint[i]; 956 port = serial->port[i]; 957 if (kfifo_alloc(&port->write_fifo, PAGE_SIZE, GFP_KERNEL)) 958 goto probe_error; 959 buffer_size = serial->type->bulk_out_size; 960 if (!buffer_size) 961 buffer_size = usb_endpoint_maxp(endpoint); 962 port->bulk_out_size = buffer_size; 963 port->bulk_out_endpointAddress = endpoint->bEndpointAddress; 964 965 for (j = 0; j < ARRAY_SIZE(port->write_urbs); ++j) { 966 set_bit(j, &port->write_urbs_free); 967 port->write_urbs[j] = usb_alloc_urb(0, GFP_KERNEL); 968 if (!port->write_urbs[j]) 969 goto probe_error; 970 port->bulk_out_buffers[j] = kmalloc(buffer_size, 971 GFP_KERNEL); 972 if (!port->bulk_out_buffers[j]) 973 goto probe_error; 974 usb_fill_bulk_urb(port->write_urbs[j], dev, 975 usb_sndbulkpipe(dev, 976 endpoint->bEndpointAddress), 977 port->bulk_out_buffers[j], buffer_size, 978 serial->type->write_bulk_callback, 979 port); 980 } 981 982 port->write_urb = port->write_urbs[0]; 983 port->bulk_out_buffer = port->bulk_out_buffers[0]; 984 } 985 986 if (serial->type->read_int_callback) { 987 for (i = 0; i < num_interrupt_in; ++i) { 988 endpoint = interrupt_in_endpoint[i]; 989 port = serial->port[i]; 990 port->interrupt_in_urb = usb_alloc_urb(0, GFP_KERNEL); 991 if (!port->interrupt_in_urb) 992 goto probe_error; 993 buffer_size = usb_endpoint_maxp(endpoint); 994 port->interrupt_in_endpointAddress = 995 endpoint->bEndpointAddress; 996 port->interrupt_in_buffer = kmalloc(buffer_size, 997 GFP_KERNEL); 998 if (!port->interrupt_in_buffer) 999 goto probe_error; 1000 usb_fill_int_urb(port->interrupt_in_urb, dev, 1001 usb_rcvintpipe(dev, 1002 endpoint->bEndpointAddress), 1003 port->interrupt_in_buffer, buffer_size, 1004 serial->type->read_int_callback, port, 1005 endpoint->bInterval); 1006 } 1007 } else if (num_interrupt_in) { 1008 dev_dbg(ddev, "The device claims to support interrupt in transfers, but read_int_callback is not defined\n"); 1009 } 1010 1011 if (serial->type->write_int_callback) { 1012 for (i = 0; i < num_interrupt_out; ++i) { 1013 endpoint = interrupt_out_endpoint[i]; 1014 port = serial->port[i]; 1015 port->interrupt_out_urb = usb_alloc_urb(0, GFP_KERNEL); 1016 if (!port->interrupt_out_urb) 1017 goto probe_error; 1018 buffer_size = usb_endpoint_maxp(endpoint); 1019 port->interrupt_out_size = buffer_size; 1020 port->interrupt_out_endpointAddress = 1021 endpoint->bEndpointAddress; 1022 port->interrupt_out_buffer = kmalloc(buffer_size, 1023 GFP_KERNEL); 1024 if (!port->interrupt_out_buffer) 1025 goto probe_error; 1026 usb_fill_int_urb(port->interrupt_out_urb, dev, 1027 usb_sndintpipe(dev, 1028 endpoint->bEndpointAddress), 1029 port->interrupt_out_buffer, buffer_size, 1030 serial->type->write_int_callback, port, 1031 endpoint->bInterval); 1032 } 1033 } else if (num_interrupt_out) { 1034 dev_dbg(ddev, "The device claims to support interrupt out transfers, but write_int_callback is not defined\n"); 1035 } 1036 1037 usb_set_intfdata(interface, serial); 1038 1039 /* if this device type has an attach function, call it */ 1040 if (type->attach) { 1041 retval = type->attach(serial); 1042 if (retval < 0) 1043 goto probe_error; 1044 serial->attached = 1; 1045 if (retval > 0) { 1046 /* quietly accept this device, but don't bind to a 1047 serial port as it's about to disappear */ 1048 serial->num_ports = 0; 1049 goto exit; 1050 } 1051 } else { 1052 serial->attached = 1; 1053 } 1054 1055 /* Avoid race with tty_open and serial_install by setting the 1056 * disconnected flag and not clearing it until all ports have been 1057 * registered. 1058 */ 1059 serial->disconnected = 1; 1060 1061 if (allocate_minors(serial, num_ports)) { 1062 dev_err(ddev, "No more free serial minor numbers\n"); 1063 goto probe_error; 1064 } 1065 1066 /* register all of the individual ports with the driver core */ 1067 for (i = 0; i < num_ports; ++i) { 1068 port = serial->port[i]; 1069 dev_set_name(&port->dev, "ttyUSB%d", port->minor); 1070 dev_dbg(ddev, "registering %s\n", dev_name(&port->dev)); 1071 device_enable_async_suspend(&port->dev); 1072 1073 retval = device_add(&port->dev); 1074 if (retval) 1075 dev_err(ddev, "Error registering port device, continuing\n"); 1076 } 1077 1078 serial->disconnected = 0; 1079 1080 usb_serial_console_init(serial->port[0]->minor); 1081 exit: 1082 module_put(type->driver.owner); 1083 return 0; 1084 1085 probe_error: 1086 usb_serial_put(serial); 1087 module_put(type->driver.owner); 1088 return -EIO; 1089 } 1090 1091 static void usb_serial_disconnect(struct usb_interface *interface) 1092 { 1093 int i; 1094 struct usb_serial *serial = usb_get_intfdata(interface); 1095 struct device *dev = &interface->dev; 1096 struct usb_serial_port *port; 1097 struct tty_struct *tty; 1098 1099 usb_serial_console_disconnect(serial); 1100 1101 mutex_lock(&serial->disc_mutex); 1102 /* must set a flag, to signal subdrivers */ 1103 serial->disconnected = 1; 1104 mutex_unlock(&serial->disc_mutex); 1105 1106 for (i = 0; i < serial->num_ports; ++i) { 1107 port = serial->port[i]; 1108 tty = tty_port_tty_get(&port->port); 1109 if (tty) { 1110 tty_vhangup(tty); 1111 tty_kref_put(tty); 1112 } 1113 usb_serial_port_poison_urbs(port); 1114 wake_up_interruptible(&port->port.delta_msr_wait); 1115 cancel_work_sync(&port->work); 1116 if (device_is_registered(&port->dev)) 1117 device_del(&port->dev); 1118 } 1119 if (serial->type->disconnect) 1120 serial->type->disconnect(serial); 1121 1122 /* let the last holder of this object cause it to be cleaned up */ 1123 usb_serial_put(serial); 1124 dev_info(dev, "device disconnected\n"); 1125 } 1126 1127 int usb_serial_suspend(struct usb_interface *intf, pm_message_t message) 1128 { 1129 struct usb_serial *serial = usb_get_intfdata(intf); 1130 int i, r = 0; 1131 1132 serial->suspending = 1; 1133 1134 /* 1135 * serial->type->suspend() MUST return 0 in system sleep context, 1136 * otherwise, the resume callback has to recover device from 1137 * previous suspend failure. 1138 */ 1139 if (serial->type->suspend) { 1140 r = serial->type->suspend(serial, message); 1141 if (r < 0) { 1142 serial->suspending = 0; 1143 goto err_out; 1144 } 1145 } 1146 1147 for (i = 0; i < serial->num_ports; ++i) 1148 usb_serial_port_poison_urbs(serial->port[i]); 1149 err_out: 1150 return r; 1151 } 1152 EXPORT_SYMBOL(usb_serial_suspend); 1153 1154 static void usb_serial_unpoison_port_urbs(struct usb_serial *serial) 1155 { 1156 int i; 1157 1158 for (i = 0; i < serial->num_ports; ++i) 1159 usb_serial_port_unpoison_urbs(serial->port[i]); 1160 } 1161 1162 int usb_serial_resume(struct usb_interface *intf) 1163 { 1164 struct usb_serial *serial = usb_get_intfdata(intf); 1165 int rv; 1166 1167 usb_serial_unpoison_port_urbs(serial); 1168 1169 serial->suspending = 0; 1170 if (serial->type->resume) 1171 rv = serial->type->resume(serial); 1172 else 1173 rv = usb_serial_generic_resume(serial); 1174 1175 return rv; 1176 } 1177 EXPORT_SYMBOL(usb_serial_resume); 1178 1179 static int usb_serial_reset_resume(struct usb_interface *intf) 1180 { 1181 struct usb_serial *serial = usb_get_intfdata(intf); 1182 int rv; 1183 1184 usb_serial_unpoison_port_urbs(serial); 1185 1186 serial->suspending = 0; 1187 if (serial->type->reset_resume) { 1188 rv = serial->type->reset_resume(serial); 1189 } else { 1190 rv = -EOPNOTSUPP; 1191 intf->needs_binding = 1; 1192 } 1193 1194 return rv; 1195 } 1196 1197 static const struct tty_operations serial_ops = { 1198 .open = serial_open, 1199 .close = serial_close, 1200 .write = serial_write, 1201 .hangup = serial_hangup, 1202 .write_room = serial_write_room, 1203 .ioctl = serial_ioctl, 1204 .set_termios = serial_set_termios, 1205 .throttle = serial_throttle, 1206 .unthrottle = serial_unthrottle, 1207 .break_ctl = serial_break, 1208 .chars_in_buffer = serial_chars_in_buffer, 1209 .wait_until_sent = serial_wait_until_sent, 1210 .tiocmget = serial_tiocmget, 1211 .tiocmset = serial_tiocmset, 1212 .get_icount = serial_get_icount, 1213 .cleanup = serial_cleanup, 1214 .install = serial_install, 1215 .proc_fops = &serial_proc_fops, 1216 }; 1217 1218 1219 struct tty_driver *usb_serial_tty_driver; 1220 1221 /* Driver structure we register with the USB core */ 1222 static struct usb_driver usb_serial_driver = { 1223 .name = "usbserial", 1224 .probe = usb_serial_probe, 1225 .disconnect = usb_serial_disconnect, 1226 .suspend = usb_serial_suspend, 1227 .resume = usb_serial_resume, 1228 .no_dynamic_id = 1, 1229 .supports_autosuspend = 1, 1230 }; 1231 1232 static int __init usb_serial_init(void) 1233 { 1234 int result; 1235 1236 usb_serial_tty_driver = alloc_tty_driver(USB_SERIAL_TTY_MINORS); 1237 if (!usb_serial_tty_driver) 1238 return -ENOMEM; 1239 1240 /* Initialize our global data */ 1241 result = bus_register(&usb_serial_bus_type); 1242 if (result) { 1243 pr_err("%s - registering bus driver failed\n", __func__); 1244 goto exit_bus; 1245 } 1246 1247 usb_serial_tty_driver->driver_name = "usbserial"; 1248 usb_serial_tty_driver->name = "ttyUSB"; 1249 usb_serial_tty_driver->major = USB_SERIAL_TTY_MAJOR; 1250 usb_serial_tty_driver->minor_start = 0; 1251 usb_serial_tty_driver->type = TTY_DRIVER_TYPE_SERIAL; 1252 usb_serial_tty_driver->subtype = SERIAL_TYPE_NORMAL; 1253 usb_serial_tty_driver->flags = TTY_DRIVER_REAL_RAW | 1254 TTY_DRIVER_DYNAMIC_DEV; 1255 usb_serial_tty_driver->init_termios = tty_std_termios; 1256 usb_serial_tty_driver->init_termios.c_cflag = B9600 | CS8 | CREAD 1257 | HUPCL | CLOCAL; 1258 usb_serial_tty_driver->init_termios.c_ispeed = 9600; 1259 usb_serial_tty_driver->init_termios.c_ospeed = 9600; 1260 tty_set_operations(usb_serial_tty_driver, &serial_ops); 1261 result = tty_register_driver(usb_serial_tty_driver); 1262 if (result) { 1263 pr_err("%s - tty_register_driver failed\n", __func__); 1264 goto exit_reg_driver; 1265 } 1266 1267 /* register the USB driver */ 1268 result = usb_register(&usb_serial_driver); 1269 if (result < 0) { 1270 pr_err("%s - usb_register failed\n", __func__); 1271 goto exit_tty; 1272 } 1273 1274 /* register the generic driver, if we should */ 1275 result = usb_serial_generic_register(); 1276 if (result < 0) { 1277 pr_err("%s - registering generic driver failed\n", __func__); 1278 goto exit_generic; 1279 } 1280 1281 return result; 1282 1283 exit_generic: 1284 usb_deregister(&usb_serial_driver); 1285 1286 exit_tty: 1287 tty_unregister_driver(usb_serial_tty_driver); 1288 1289 exit_reg_driver: 1290 bus_unregister(&usb_serial_bus_type); 1291 1292 exit_bus: 1293 pr_err("%s - returning with error %d\n", __func__, result); 1294 put_tty_driver(usb_serial_tty_driver); 1295 return result; 1296 } 1297 1298 1299 static void __exit usb_serial_exit(void) 1300 { 1301 usb_serial_console_exit(); 1302 1303 usb_serial_generic_deregister(); 1304 1305 usb_deregister(&usb_serial_driver); 1306 tty_unregister_driver(usb_serial_tty_driver); 1307 put_tty_driver(usb_serial_tty_driver); 1308 bus_unregister(&usb_serial_bus_type); 1309 idr_destroy(&serial_minors); 1310 } 1311 1312 1313 module_init(usb_serial_init); 1314 module_exit(usb_serial_exit); 1315 1316 #define set_to_generic_if_null(type, function) \ 1317 do { \ 1318 if (!type->function) { \ 1319 type->function = usb_serial_generic_##function; \ 1320 pr_debug("%s: using generic " #function "\n", \ 1321 type->driver.name); \ 1322 } \ 1323 } while (0) 1324 1325 static void usb_serial_operations_init(struct usb_serial_driver *device) 1326 { 1327 set_to_generic_if_null(device, open); 1328 set_to_generic_if_null(device, write); 1329 set_to_generic_if_null(device, close); 1330 set_to_generic_if_null(device, write_room); 1331 set_to_generic_if_null(device, chars_in_buffer); 1332 if (device->tx_empty) 1333 set_to_generic_if_null(device, wait_until_sent); 1334 set_to_generic_if_null(device, read_bulk_callback); 1335 set_to_generic_if_null(device, write_bulk_callback); 1336 set_to_generic_if_null(device, process_read_urb); 1337 set_to_generic_if_null(device, prepare_write_buffer); 1338 } 1339 1340 static int usb_serial_register(struct usb_serial_driver *driver) 1341 { 1342 int retval; 1343 1344 if (usb_disabled()) 1345 return -ENODEV; 1346 1347 if (!driver->description) 1348 driver->description = driver->driver.name; 1349 if (!driver->usb_driver) { 1350 WARN(1, "Serial driver %s has no usb_driver\n", 1351 driver->description); 1352 return -EINVAL; 1353 } 1354 1355 usb_serial_operations_init(driver); 1356 1357 /* Add this device to our list of devices */ 1358 mutex_lock(&table_lock); 1359 list_add(&driver->driver_list, &usb_serial_driver_list); 1360 1361 retval = usb_serial_bus_register(driver); 1362 if (retval) { 1363 pr_err("problem %d when registering driver %s\n", retval, driver->description); 1364 list_del(&driver->driver_list); 1365 } else { 1366 pr_info("USB Serial support registered for %s\n", driver->description); 1367 } 1368 mutex_unlock(&table_lock); 1369 return retval; 1370 } 1371 1372 static void usb_serial_deregister(struct usb_serial_driver *device) 1373 { 1374 pr_info("USB Serial deregistering driver %s\n", device->description); 1375 1376 mutex_lock(&table_lock); 1377 list_del(&device->driver_list); 1378 mutex_unlock(&table_lock); 1379 1380 usb_serial_bus_deregister(device); 1381 } 1382 1383 /** 1384 * usb_serial_register_drivers - register drivers for a usb-serial module 1385 * @serial_drivers: NULL-terminated array of pointers to drivers to be registered 1386 * @name: name of the usb_driver for this set of @serial_drivers 1387 * @id_table: list of all devices this @serial_drivers set binds to 1388 * 1389 * Registers all the drivers in the @serial_drivers array, and dynamically 1390 * creates a struct usb_driver with the name @name and id_table of @id_table. 1391 */ 1392 int usb_serial_register_drivers(struct usb_serial_driver *const serial_drivers[], 1393 const char *name, 1394 const struct usb_device_id *id_table) 1395 { 1396 int rc; 1397 struct usb_driver *udriver; 1398 struct usb_serial_driver * const *sd; 1399 1400 /* 1401 * udriver must be registered before any of the serial drivers, 1402 * because the store_new_id() routine for the serial drivers (in 1403 * bus.c) probes udriver. 1404 * 1405 * Performance hack: We don't want udriver to be probed until 1406 * the serial drivers are registered, because the probe would 1407 * simply fail for lack of a matching serial driver. 1408 * So we leave udriver's id_table set to NULL until we are all set. 1409 * 1410 * Suspend/resume support is implemented in the usb-serial core, 1411 * so fill in the PM-related fields in udriver. 1412 */ 1413 udriver = kzalloc(sizeof(*udriver), GFP_KERNEL); 1414 if (!udriver) 1415 return -ENOMEM; 1416 1417 udriver->name = name; 1418 udriver->no_dynamic_id = 1; 1419 udriver->supports_autosuspend = 1; 1420 udriver->suspend = usb_serial_suspend; 1421 udriver->resume = usb_serial_resume; 1422 udriver->probe = usb_serial_probe; 1423 udriver->disconnect = usb_serial_disconnect; 1424 1425 /* we only set the reset_resume field if the serial_driver has one */ 1426 for (sd = serial_drivers; *sd; ++sd) { 1427 if ((*sd)->reset_resume) { 1428 udriver->reset_resume = usb_serial_reset_resume; 1429 break; 1430 } 1431 } 1432 1433 rc = usb_register(udriver); 1434 if (rc) 1435 return rc; 1436 1437 for (sd = serial_drivers; *sd; ++sd) { 1438 (*sd)->usb_driver = udriver; 1439 rc = usb_serial_register(*sd); 1440 if (rc) 1441 goto failed; 1442 } 1443 1444 /* Now set udriver's id_table and look for matches */ 1445 udriver->id_table = id_table; 1446 rc = driver_attach(&udriver->drvwrap.driver); 1447 return 0; 1448 1449 failed: 1450 while (sd-- > serial_drivers) 1451 usb_serial_deregister(*sd); 1452 usb_deregister(udriver); 1453 return rc; 1454 } 1455 EXPORT_SYMBOL_GPL(usb_serial_register_drivers); 1456 1457 /** 1458 * usb_serial_deregister_drivers - deregister drivers for a usb-serial module 1459 * @serial_drivers: NULL-terminated array of pointers to drivers to be deregistered 1460 * 1461 * Deregisters all the drivers in the @serial_drivers array and deregisters and 1462 * frees the struct usb_driver that was created by the call to 1463 * usb_serial_register_drivers(). 1464 */ 1465 void usb_serial_deregister_drivers(struct usb_serial_driver *const serial_drivers[]) 1466 { 1467 struct usb_driver *udriver = (*serial_drivers)->usb_driver; 1468 1469 for (; *serial_drivers; ++serial_drivers) 1470 usb_serial_deregister(*serial_drivers); 1471 usb_deregister(udriver); 1472 kfree(udriver); 1473 } 1474 EXPORT_SYMBOL_GPL(usb_serial_deregister_drivers); 1475 1476 MODULE_AUTHOR(DRIVER_AUTHOR); 1477 MODULE_DESCRIPTION(DRIVER_DESC); 1478 MODULE_LICENSE("GPL"); 1479