Version:  2.0.40 2.2.26 2.4.37 3.2 3.3 3.4 3.5 3.6 3.7 3.8 3.9 3.10 3.11 3.12 3.13 3.14 3.15 3.16 3.17 3.18

Linux/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
 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 */
 47 static 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 
 64 static bool debug;
 65 /* initially all NULL */
 66 static struct usb_serial *serial_table[SERIAL_TTY_MINORS];
 67 static DEFINE_MUTEX(table_lock);
 68 static 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  */
 75 struct 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 
 95 static 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 
133 static 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 
145 static 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 
175 void 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  */
198 static 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 
246 static 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 
266 static 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  */
283 static 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 
298 static 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 
305 static 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  */
322 static 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 
350 static 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);
365 exit:
366         return retval;
367 }
368 
369 static 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 
377 static 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 
390 static 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 
400 static 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 
410 static 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 
427 static 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 
440 static 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 
453 static 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 
487 static int serial_proc_open(struct inode *inode, struct file *file)
488 {
489         return single_open(file, serial_proc_show, NULL);
490 }
491 
492 static 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 
500 static 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 
511 static 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 
523 static 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  */
540 void usb_serial_port_softint(struct usb_serial_port *port)
541 {
542         schedule_work(&port->work);
543 }
544 EXPORT_SYMBOL_GPL(usb_serial_port_softint);
545 
546 static 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 
562 static 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 
585 static 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 
615 static 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 
636 static 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 
652 static 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");
665 exit:
666         return id;
667 }
668 
669 /* Caller must hold table_lock */
670 static struct usb_serial_driver *search_serial_device(
671                                         struct usb_interface *iface)
672 {
673         const struct usb_device_id *id;
674         struct usb_serial_driver *drv;
675 
676         /* Check if the usb id matches a known device */
677         list_for_each_entry(drv, &usb_serial_driver_list, driver_list) {
678                 id = get_iface_id(drv, iface);
679                 if (id)
680                         return drv;
681         }
682 
683         return NULL;
684 }
685 
686 static int serial_carrier_raised(struct tty_port *port)
687 {
688         struct usb_serial_port *p = container_of(port, struct usb_serial_port, port);
689         struct usb_serial_driver *drv = p->serial->type;
690 
691         if (drv->carrier_raised)
692                 return drv->carrier_raised(p);
693         /* No carrier control - don't block */
694         return 1;
695 }
696 
697 static void serial_dtr_rts(struct tty_port *port, int on)
698 {
699         struct usb_serial_port *p = container_of(port, struct usb_serial_port, port);
700         struct usb_serial_driver *drv = p->serial->type;
701 
702         if (drv->dtr_rts)
703                 drv->dtr_rts(p, on);
704 }
705 
706 static const struct tty_port_operations serial_port_ops = {
707         .carrier_raised = serial_carrier_raised,
708         .dtr_rts = serial_dtr_rts,
709         .activate = serial_activate,
710         .shutdown = serial_down,
711 };
712 
713 int usb_serial_probe(struct usb_interface *interface,
714                                const struct usb_device_id *id)
715 {
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         unsigned int minor;
728         int buffer_size;
729         int i;
730         int j;
731         int num_interrupt_in = 0;
732         int num_interrupt_out = 0;
733         int num_bulk_in = 0;
734         int num_bulk_out = 0;
735         int num_ports = 0;
736         int max_endpoints;
737 
738         mutex_lock(&table_lock);
739         type = search_serial_device(interface);
740         if (!type) {
741                 mutex_unlock(&table_lock);
742                 dbg("none matched");
743                 return -ENODEV;
744         }
745 
746         if (!try_module_get(type->driver.owner)) {
747                 mutex_unlock(&table_lock);
748                 dev_err(&interface->dev, "module get failed, exiting\n");
749                 return -EIO;
750         }
751         mutex_unlock(&table_lock);
752 
753         serial = create_serial(dev, interface, type);
754         if (!serial) {
755                 module_put(type->driver.owner);
756                 dev_err(&interface->dev, "%s - out of memory\n", __func__);
757                 return -ENOMEM;
758         }
759 
760         /* if this device type has a probe function, call it */
761         if (type->probe) {
762                 const struct usb_device_id *id;
763 
764                 id = get_iface_id(type, interface);
765                 retval = type->probe(serial, id);
766 
767                 if (retval) {
768                         dbg("sub driver rejected device");
769                         kfree(serial);
770                         module_put(type->driver.owner);
771                         return retval;
772                 }
773         }
774 
775         /* descriptor matches, let's find the endpoints needed */
776         /* check out the endpoints */
777         iface_desc = interface->cur_altsetting;
778         for (i = 0; i < iface_desc->desc.bNumEndpoints; ++i) {
779                 endpoint = &iface_desc->endpoint[i].desc;
780 
781                 if (usb_endpoint_is_bulk_in(endpoint)) {
782                         /* we found a bulk in endpoint */
783                         dbg("found bulk in on endpoint %d", i);
784                         bulk_in_endpoint[num_bulk_in] = endpoint;
785                         ++num_bulk_in;
786                 }
787 
788                 if (usb_endpoint_is_bulk_out(endpoint)) {
789                         /* we found a bulk out endpoint */
790                         dbg("found bulk out on endpoint %d", i);
791                         bulk_out_endpoint[num_bulk_out] = endpoint;
792                         ++num_bulk_out;
793                 }
794 
795                 if (usb_endpoint_is_int_in(endpoint)) {
796                         /* we found a interrupt in endpoint */
797                         dbg("found interrupt in on endpoint %d", i);
798                         interrupt_in_endpoint[num_interrupt_in] = endpoint;
799                         ++num_interrupt_in;
800                 }
801 
802                 if (usb_endpoint_is_int_out(endpoint)) {
803                         /* we found an interrupt out endpoint */
804                         dbg("found interrupt out on endpoint %d", i);
805                         interrupt_out_endpoint[num_interrupt_out] = endpoint;
806                         ++num_interrupt_out;
807                 }
808         }
809 
810 #if defined(CONFIG_USB_SERIAL_PL2303) || defined(CONFIG_USB_SERIAL_PL2303_MODULE)
811         /* BEGIN HORRIBLE HACK FOR PL2303 */
812         /* this is needed due to the looney way its endpoints are set up */
813         if (((le16_to_cpu(dev->descriptor.idVendor) == PL2303_VENDOR_ID) &&
814              (le16_to_cpu(dev->descriptor.idProduct) == PL2303_PRODUCT_ID)) ||
815             ((le16_to_cpu(dev->descriptor.idVendor) == ATEN_VENDOR_ID) &&
816              (le16_to_cpu(dev->descriptor.idProduct) == ATEN_PRODUCT_ID)) ||
817             ((le16_to_cpu(dev->descriptor.idVendor) == ALCOR_VENDOR_ID) &&
818              (le16_to_cpu(dev->descriptor.idProduct) == ALCOR_PRODUCT_ID)) ||
819             ((le16_to_cpu(dev->descriptor.idVendor) == SIEMENS_VENDOR_ID) &&
820              (le16_to_cpu(dev->descriptor.idProduct) == SIEMENS_PRODUCT_ID_EF81))) {
821                 if (interface != dev->actconfig->interface[0]) {
822                         /* check out the endpoints of the other interface*/
823                         iface_desc = dev->actconfig->interface[0]->cur_altsetting;
824                         for (i = 0; i < iface_desc->desc.bNumEndpoints; ++i) {
825                                 endpoint = &iface_desc->endpoint[i].desc;
826                                 if (usb_endpoint_is_int_in(endpoint)) {
827                                         /* we found a interrupt in endpoint */
828                                         dbg("found interrupt in for Prolific device on separate interface");
829                                         interrupt_in_endpoint[num_interrupt_in] = endpoint;
830                                         ++num_interrupt_in;
831                                 }
832                         }
833                 }
834 
835                 /* Now make sure the PL-2303 is configured correctly.
836                  * If not, give up now and hope this hack will work
837                  * properly during a later invocation of usb_serial_probe
838                  */
839                 if (num_bulk_in == 0 || num_bulk_out == 0) {
840                         dev_info(&interface->dev, "PL-2303 hack: descriptors matched but endpoints did not\n");
841                         kfree(serial);
842                         module_put(type->driver.owner);
843                         return -ENODEV;
844                 }
845         }
846         /* END HORRIBLE HACK FOR PL2303 */
847 #endif
848 
849 #ifdef CONFIG_USB_SERIAL_GENERIC
850         if (type == &usb_serial_generic_device) {
851                 num_ports = num_bulk_out;
852                 if (num_ports == 0) {
853                         dev_err(&interface->dev,
854                             "Generic device with no bulk out, not allowed.\n");
855                         kfree(serial);
856                         module_put(type->driver.owner);
857                         return -EIO;
858                 }
859         }
860 #endif
861         if (!num_ports) {
862                 /* if this device type has a calc_num_ports function, call it */
863                 if (type->calc_num_ports)
864                         num_ports = type->calc_num_ports(serial);
865                 if (!num_ports)
866                         num_ports = type->num_ports;
867         }
868 
869         serial->num_ports = num_ports;
870         serial->num_bulk_in = num_bulk_in;
871         serial->num_bulk_out = num_bulk_out;
872         serial->num_interrupt_in = num_interrupt_in;
873         serial->num_interrupt_out = num_interrupt_out;
874 
875         /* found all that we need */
876         dev_info(&interface->dev, "%s converter detected\n",
877                         type->description);
878 
879         /* create our ports, we need as many as the max endpoints */
880         /* we don't use num_ports here because some devices have more
881            endpoint pairs than ports */
882         max_endpoints = max(num_bulk_in, num_bulk_out);
883         max_endpoints = max(max_endpoints, num_interrupt_in);
884         max_endpoints = max(max_endpoints, num_interrupt_out);
885         max_endpoints = max(max_endpoints, (int)serial->num_ports);
886         serial->num_port_pointers = max_endpoints;
887 
888         dbg("%s - setting up %d port structures for this device",
889                                                 __func__, max_endpoints);
890         for (i = 0; i < max_endpoints; ++i) {
891                 port = kzalloc(sizeof(struct usb_serial_port), GFP_KERNEL);
892                 if (!port)
893                         goto probe_error;
894                 tty_port_init(&port->port);
895                 port->port.ops = &serial_port_ops;
896                 port->serial = serial;
897                 spin_lock_init(&port->lock);
898                 /* Keep this for private driver use for the moment but
899                    should probably go away */
900                 INIT_WORK(&port->work, usb_serial_port_work);
901                 serial->port[i] = port;
902                 port->dev.parent = &interface->dev;
903                 port->dev.driver = NULL;
904                 port->dev.bus = &usb_serial_bus_type;
905                 port->dev.release = &port_release;
906                 device_initialize(&port->dev);
907         }
908 
909         /* set up the endpoint information */
910         for (i = 0; i < num_bulk_in; ++i) {
911                 endpoint = bulk_in_endpoint[i];
912                 port = serial->port[i];
913                 buffer_size = max_t(int, serial->type->bulk_in_size,
914                                 usb_endpoint_maxp(endpoint));
915                 port->bulk_in_size = buffer_size;
916                 port->bulk_in_endpointAddress = endpoint->bEndpointAddress;
917 
918                 for (j = 0; j < ARRAY_SIZE(port->read_urbs); ++j) {
919                         set_bit(j, &port->read_urbs_free);
920                         port->read_urbs[j] = usb_alloc_urb(0, GFP_KERNEL);
921                         if (!port->read_urbs[j]) {
922                                 dev_err(&interface->dev,
923                                                 "No free urbs available\n");
924                                 goto probe_error;
925                         }
926                         port->bulk_in_buffers[j] = kmalloc(buffer_size,
927                                                                 GFP_KERNEL);
928                         if (!port->bulk_in_buffers[j]) {
929                                 dev_err(&interface->dev,
930                                         "Couldn't allocate bulk_in_buffer\n");
931                                 goto probe_error;
932                         }
933                         usb_fill_bulk_urb(port->read_urbs[j], dev,
934                                         usb_rcvbulkpipe(dev,
935                                                 endpoint->bEndpointAddress),
936                                         port->bulk_in_buffers[j], buffer_size,
937                                         serial->type->read_bulk_callback,
938                                         port);
939                 }
940 
941                 port->read_urb = port->read_urbs[0];
942                 port->bulk_in_buffer = port->bulk_in_buffers[0];
943         }
944 
945         for (i = 0; i < num_bulk_out; ++i) {
946                 endpoint = bulk_out_endpoint[i];
947                 port = serial->port[i];
948                 if (kfifo_alloc(&port->write_fifo, PAGE_SIZE, GFP_KERNEL))
949                         goto probe_error;
950                 buffer_size = serial->type->bulk_out_size;
951                 if (!buffer_size)
952                         buffer_size = usb_endpoint_maxp(endpoint);
953                 port->bulk_out_size = buffer_size;
954                 port->bulk_out_endpointAddress = endpoint->bEndpointAddress;
955 
956                 for (j = 0; j < ARRAY_SIZE(port->write_urbs); ++j) {
957                         set_bit(j, &port->write_urbs_free);
958                         port->write_urbs[j] = usb_alloc_urb(0, GFP_KERNEL);
959                         if (!port->write_urbs[j]) {
960                                 dev_err(&interface->dev,
961                                                 "No free urbs available\n");
962                                 goto probe_error;
963                         }
964                         port->bulk_out_buffers[j] = kmalloc(buffer_size,
965                                                                 GFP_KERNEL);
966                         if (!port->bulk_out_buffers[j]) {
967                                 dev_err(&interface->dev,
968                                         "Couldn't allocate bulk_out_buffer\n");
969                                 goto probe_error;
970                         }
971                         usb_fill_bulk_urb(port->write_urbs[j], dev,
972                                         usb_sndbulkpipe(dev,
973                                                 endpoint->bEndpointAddress),
974                                         port->bulk_out_buffers[j], buffer_size,
975                                         serial->type->write_bulk_callback,
976                                         port);
977                 }
978 
979                 port->write_urb = port->write_urbs[0];
980                 port->bulk_out_buffer = port->bulk_out_buffers[0];
981         }
982 
983         if (serial->type->read_int_callback) {
984                 for (i = 0; i < num_interrupt_in; ++i) {
985                         endpoint = interrupt_in_endpoint[i];
986                         port = serial->port[i];
987                         port->interrupt_in_urb = usb_alloc_urb(0, GFP_KERNEL);
988                         if (!port->interrupt_in_urb) {
989                                 dev_err(&interface->dev,
990                                                 "No free urbs available\n");
991                                 goto probe_error;
992                         }
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                                 dev_err(&interface->dev,
1000                                     "Couldn't allocate interrupt_in_buffer\n");
1001                                 goto probe_error;
1002                         }
1003                         usb_fill_int_urb(port->interrupt_in_urb, dev,
1004                                 usb_rcvintpipe(dev,
1005                                                 endpoint->bEndpointAddress),
1006                                 port->interrupt_in_buffer, buffer_size,
1007                                 serial->type->read_int_callback, port,
1008                                 endpoint->bInterval);
1009                 }
1010         } else if (num_interrupt_in) {
1011                 dbg("the device claims to support interrupt in transfers, but read_int_callback is not defined");
1012         }
1013 
1014         if (serial->type->write_int_callback) {
1015                 for (i = 0; i < num_interrupt_out; ++i) {
1016                         endpoint = interrupt_out_endpoint[i];
1017                         port = serial->port[i];
1018                         port->interrupt_out_urb = usb_alloc_urb(0, GFP_KERNEL);
1019                         if (!port->interrupt_out_urb) {
1020                                 dev_err(&interface->dev,
1021                                                 "No free urbs available\n");
1022                                 goto probe_error;
1023                         }
1024                         buffer_size = usb_endpoint_maxp(endpoint);
1025                         port->interrupt_out_size = buffer_size;
1026                         port->interrupt_out_endpointAddress =
1027                                                 endpoint->bEndpointAddress;
1028                         port->interrupt_out_buffer = kmalloc(buffer_size,
1029                                                                 GFP_KERNEL);
1030                         if (!port->interrupt_out_buffer) {
1031                                 dev_err(&interface->dev,
1032                                   "Couldn't allocate interrupt_out_buffer\n");
1033                                 goto probe_error;
1034                         }
1035                         usb_fill_int_urb(port->interrupt_out_urb, dev,
1036                                 usb_sndintpipe(dev,
1037                                                   endpoint->bEndpointAddress),
1038                                 port->interrupt_out_buffer, buffer_size,
1039                                 serial->type->write_int_callback, port,
1040                                 endpoint->bInterval);
1041                 }
1042         } else if (num_interrupt_out) {
1043                 dbg("the device claims to support interrupt out transfers, but write_int_callback is not defined");
1044         }
1045 
1046         /* if this device type has an attach function, call it */
1047         if (type->attach) {
1048                 retval = type->attach(serial);
1049                 if (retval < 0)
1050                         goto probe_error;
1051                 serial->attached = 1;
1052                 if (retval > 0) {
1053                         /* quietly accept this device, but don't bind to a
1054                            serial port as it's about to disappear */
1055                         serial->num_ports = 0;
1056                         goto exit;
1057                 }
1058         } else {
1059                 serial->attached = 1;
1060         }
1061 
1062         /* Avoid race with tty_open and serial_install by setting the
1063          * disconnected flag and not clearing it until all ports have been
1064          * registered.
1065          */
1066         serial->disconnected = 1;
1067 
1068         if (get_free_serial(serial, num_ports, &minor) == NULL) {
1069                 dev_err(&interface->dev, "No more free serial devices\n");
1070                 goto probe_error;
1071         }
1072         serial->minor = minor;
1073 
1074         /* register all of the individual ports with the driver core */
1075         for (i = 0; i < num_ports; ++i) {
1076                 port = serial->port[i];
1077                 dev_set_name(&port->dev, "ttyUSB%d", port->number);
1078                 dbg ("%s - registering %s", __func__, dev_name(&port->dev));
1079                 device_enable_async_suspend(&port->dev);
1080 
1081                 retval = device_add(&port->dev);
1082                 if (retval)
1083                         dev_err(&port->dev, "Error registering port device, "
1084                                 "continuing\n");
1085         }
1086 
1087         serial->disconnected = 0;
1088 
1089         usb_serial_console_init(debug, minor);
1090 
1091 exit:
1092         /* success */
1093         usb_set_intfdata(interface, serial);
1094         module_put(type->driver.owner);
1095         return 0;
1096 
1097 probe_error:
1098         usb_serial_put(serial);
1099         module_put(type->driver.owner);
1100         return -EIO;
1101 }
1102 EXPORT_SYMBOL_GPL(usb_serial_probe);
1103 
1104 void usb_serial_disconnect(struct usb_interface *interface)
1105 {
1106         int i;
1107         struct usb_serial *serial = usb_get_intfdata(interface);
1108         struct device *dev = &interface->dev;
1109         struct usb_serial_port *port;
1110 
1111         usb_serial_console_disconnect(serial);
1112         dbg("%s", __func__);
1113 
1114         mutex_lock(&serial->disc_mutex);
1115         usb_set_intfdata(interface, NULL);
1116         /* must set a flag, to signal subdrivers */
1117         serial->disconnected = 1;
1118         mutex_unlock(&serial->disc_mutex);
1119 
1120         for (i = 0; i < serial->num_ports; ++i) {
1121                 port = serial->port[i];
1122                 if (port) {
1123                         struct tty_struct *tty = tty_port_tty_get(&port->port);
1124                         if (tty) {
1125                                 tty_vhangup(tty);
1126                                 tty_kref_put(tty);
1127                         }
1128                         kill_traffic(port);
1129                         cancel_work_sync(&port->work);
1130                         if (device_is_registered(&port->dev))
1131                                 device_del(&port->dev);
1132                 }
1133         }
1134         serial->type->disconnect(serial);
1135 
1136         /* let the last holder of this object cause it to be cleaned up */
1137         usb_serial_put(serial);
1138         dev_info(dev, "device disconnected\n");
1139 }
1140 EXPORT_SYMBOL_GPL(usb_serial_disconnect);
1141 
1142 int usb_serial_suspend(struct usb_interface *intf, pm_message_t message)
1143 {
1144         struct usb_serial *serial = usb_get_intfdata(intf);
1145         struct usb_serial_port *port;
1146         int i, r = 0;
1147 
1148         serial->suspending = 1;
1149 
1150         if (serial->type->suspend) {
1151                 r = serial->type->suspend(serial, message);
1152                 if (r < 0) {
1153                         serial->suspending = 0;
1154                         goto err_out;
1155                 }
1156         }
1157 
1158         for (i = 0; i < serial->num_ports; ++i) {
1159                 port = serial->port[i];
1160                 if (port)
1161                         kill_traffic(port);
1162         }
1163 
1164 err_out:
1165         return r;
1166 }
1167 EXPORT_SYMBOL(usb_serial_suspend);
1168 
1169 int usb_serial_resume(struct usb_interface *intf)
1170 {
1171         struct usb_serial *serial = usb_get_intfdata(intf);
1172         int rv;
1173 
1174         serial->suspending = 0;
1175         if (serial->type->resume)
1176                 rv = serial->type->resume(serial);
1177         else
1178                 rv = usb_serial_generic_resume(serial);
1179 
1180         return rv;
1181 }
1182 EXPORT_SYMBOL(usb_serial_resume);
1183 
1184 static const struct tty_operations serial_ops = {
1185         .open =                 serial_open,
1186         .close =                serial_close,
1187         .write =                serial_write,
1188         .hangup =               serial_hangup,
1189         .write_room =           serial_write_room,
1190         .ioctl =                serial_ioctl,
1191         .set_termios =          serial_set_termios,
1192         .throttle =             serial_throttle,
1193         .unthrottle =           serial_unthrottle,
1194         .break_ctl =            serial_break,
1195         .chars_in_buffer =      serial_chars_in_buffer,
1196         .tiocmget =             serial_tiocmget,
1197         .tiocmset =             serial_tiocmset,
1198         .get_icount =           serial_get_icount,
1199         .cleanup =              serial_cleanup,
1200         .install =              serial_install,
1201         .proc_fops =            &serial_proc_fops,
1202 };
1203 
1204 
1205 struct tty_driver *usb_serial_tty_driver;
1206 
1207 static int __init usb_serial_init(void)
1208 {
1209         int i;
1210         int result;
1211 
1212         usb_serial_tty_driver = alloc_tty_driver(SERIAL_TTY_MINORS);
1213         if (!usb_serial_tty_driver)
1214                 return -ENOMEM;
1215 
1216         /* Initialize our global data */
1217         for (i = 0; i < SERIAL_TTY_MINORS; ++i)
1218                 serial_table[i] = NULL;
1219 
1220         result = bus_register(&usb_serial_bus_type);
1221         if (result) {
1222                 printk(KERN_ERR "usb-serial: %s - registering bus driver "
1223                        "failed\n", __func__);
1224                 goto exit_bus;
1225         }
1226 
1227         usb_serial_tty_driver->driver_name = "usbserial";
1228         usb_serial_tty_driver->name = "ttyUSB";
1229         usb_serial_tty_driver->major = SERIAL_TTY_MAJOR;
1230         usb_serial_tty_driver->minor_start = 0;
1231         usb_serial_tty_driver->type = TTY_DRIVER_TYPE_SERIAL;
1232         usb_serial_tty_driver->subtype = SERIAL_TYPE_NORMAL;
1233         usb_serial_tty_driver->flags = TTY_DRIVER_REAL_RAW |
1234                                                 TTY_DRIVER_DYNAMIC_DEV;
1235         usb_serial_tty_driver->init_termios = tty_std_termios;
1236         usb_serial_tty_driver->init_termios.c_cflag = B9600 | CS8 | CREAD
1237                                                         | HUPCL | CLOCAL;
1238         usb_serial_tty_driver->init_termios.c_ispeed = 9600;
1239         usb_serial_tty_driver->init_termios.c_ospeed = 9600;
1240         tty_set_operations(usb_serial_tty_driver, &serial_ops);
1241         result = tty_register_driver(usb_serial_tty_driver);
1242         if (result) {
1243                 printk(KERN_ERR "usb-serial: %s - tty_register_driver failed\n",
1244                        __func__);
1245                 goto exit_reg_driver;
1246         }
1247 
1248         /* register the USB driver */
1249         result = usb_register(&usb_serial_driver);
1250         if (result < 0) {
1251                 printk(KERN_ERR "usb-serial: %s - usb_register failed\n",
1252                        __func__);
1253                 goto exit_tty;
1254         }
1255 
1256         /* register the generic driver, if we should */
1257         result = usb_serial_generic_register(debug);
1258         if (result < 0) {
1259                 printk(KERN_ERR "usb-serial: %s - registering generic "
1260                        "driver failed\n", __func__);
1261                 goto exit_generic;
1262         }
1263 
1264         printk(KERN_INFO KBUILD_MODNAME ": " DRIVER_DESC "\n");
1265 
1266         return result;
1267 
1268 exit_generic:
1269         usb_deregister(&usb_serial_driver);
1270 
1271 exit_tty:
1272         tty_unregister_driver(usb_serial_tty_driver);
1273 
1274 exit_reg_driver:
1275         bus_unregister(&usb_serial_bus_type);
1276 
1277 exit_bus:
1278         printk(KERN_ERR "usb-serial: %s - returning with error %d\n",
1279                __func__, result);
1280         put_tty_driver(usb_serial_tty_driver);
1281         return result;
1282 }
1283 
1284 
1285 static void __exit usb_serial_exit(void)
1286 {
1287         usb_serial_console_exit();
1288 
1289         usb_serial_generic_deregister();
1290 
1291         usb_deregister(&usb_serial_driver);
1292         tty_unregister_driver(usb_serial_tty_driver);
1293         put_tty_driver(usb_serial_tty_driver);
1294         bus_unregister(&usb_serial_bus_type);
1295 }
1296 
1297 
1298 module_init(usb_serial_init);
1299 module_exit(usb_serial_exit);
1300 
1301 #define set_to_generic_if_null(type, function)                          \
1302         do {                                                            \
1303                 if (!type->function) {                                  \
1304                         type->function = usb_serial_generic_##function; \
1305                         dbg("Had to override the " #function            \
1306                                 " usb serial operation with the generic one.");\
1307                         }                                               \
1308         } while (0)
1309 
1310 static void fixup_generic(struct usb_serial_driver *device)
1311 {
1312         set_to_generic_if_null(device, open);
1313         set_to_generic_if_null(device, write);
1314         set_to_generic_if_null(device, close);
1315         set_to_generic_if_null(device, write_room);
1316         set_to_generic_if_null(device, chars_in_buffer);
1317         set_to_generic_if_null(device, read_bulk_callback);
1318         set_to_generic_if_null(device, write_bulk_callback);
1319         set_to_generic_if_null(device, disconnect);
1320         set_to_generic_if_null(device, release);
1321         set_to_generic_if_null(device, process_read_urb);
1322         set_to_generic_if_null(device, prepare_write_buffer);
1323 }
1324 
1325 static int usb_serial_register(struct usb_serial_driver *driver)
1326 {
1327         int retval;
1328 
1329         if (usb_disabled())
1330                 return -ENODEV;
1331 
1332         fixup_generic(driver);
1333 
1334         if (!driver->description)
1335                 driver->description = driver->driver.name;
1336         if (!driver->usb_driver) {
1337                 WARN(1, "Serial driver %s has no usb_driver\n",
1338                                 driver->description);
1339                 return -EINVAL;
1340         }
1341         driver->usb_driver->supports_autosuspend = 1;
1342 
1343         /* Add this device to our list of devices */
1344         mutex_lock(&table_lock);
1345         list_add(&driver->driver_list, &usb_serial_driver_list);
1346 
1347         retval = usb_serial_bus_register(driver);
1348         if (retval) {
1349                 printk(KERN_ERR "usb-serial: problem %d when registering "
1350                        "driver %s\n", retval, driver->description);
1351                 list_del(&driver->driver_list);
1352         } else
1353                 printk(KERN_INFO "USB Serial support registered for %s\n",
1354                                                 driver->description);
1355 
1356         mutex_unlock(&table_lock);
1357         return retval;
1358 }
1359 
1360 static void usb_serial_deregister(struct usb_serial_driver *device)
1361 {
1362         printk(KERN_INFO "USB Serial deregistering driver %s\n",
1363                device->description);
1364         mutex_lock(&table_lock);
1365         list_del(&device->driver_list);
1366         usb_serial_bus_deregister(device);
1367         mutex_unlock(&table_lock);
1368 }
1369 
1370 /**
1371  * usb_serial_register_drivers - register drivers for a usb-serial module
1372  * @udriver: usb_driver used for matching devices/interfaces
1373  * @serial_drivers: NULL-terminated array of pointers to drivers to be registered
1374  *
1375  * Registers @udriver and all the drivers in the @serial_drivers array.
1376  * Automatically fills in the .no_dynamic_id field in @udriver and
1377  * the .usb_driver field in each serial driver.
1378  */
1379 int usb_serial_register_drivers(struct usb_driver *udriver,
1380                 struct usb_serial_driver * const serial_drivers[])
1381 {
1382         int rc;
1383         const struct usb_device_id *saved_id_table;
1384         struct usb_serial_driver * const *sd;
1385 
1386         /*
1387          * udriver must be registered before any of the serial drivers,
1388          * because the store_new_id() routine for the serial drivers (in
1389          * bus.c) probes udriver.
1390          *
1391          * Performance hack: We don't want udriver to be probed until
1392          * the serial drivers are registered, because the probe would
1393          * simply fail for lack of a matching serial driver.
1394          * Therefore save off udriver's id_table until we are all set.
1395          */
1396         saved_id_table = udriver->id_table;
1397         udriver->id_table = NULL;
1398 
1399         udriver->no_dynamic_id = 1;
1400         rc = usb_register(udriver);
1401         if (rc)
1402                 return rc;
1403 
1404         for (sd = serial_drivers; *sd; ++sd) {
1405                 (*sd)->usb_driver = udriver;
1406                 rc = usb_serial_register(*sd);
1407                 if (rc)
1408                         goto failed;
1409         }
1410 
1411         /* Now restore udriver's id_table and look for matches */
1412         udriver->id_table = saved_id_table;
1413         rc = driver_attach(&udriver->drvwrap.driver);
1414         return 0;
1415 
1416  failed:
1417         while (sd-- > serial_drivers)
1418                 usb_serial_deregister(*sd);
1419         usb_deregister(udriver);
1420         return rc;
1421 }
1422 EXPORT_SYMBOL_GPL(usb_serial_register_drivers);
1423 
1424 /**
1425  * usb_serial_deregister_drivers - deregister drivers for a usb-serial module
1426  * @udriver: usb_driver to unregister
1427  * @serial_drivers: NULL-terminated array of pointers to drivers to be deregistered
1428  *
1429  * Deregisters @udriver and all the drivers in the @serial_drivers array.
1430  */
1431 void usb_serial_deregister_drivers(struct usb_driver *udriver,
1432                 struct usb_serial_driver * const serial_drivers[])
1433 {
1434         for (; *serial_drivers; ++serial_drivers)
1435                 usb_serial_deregister(*serial_drivers);
1436         usb_deregister(udriver);
1437 }
1438 EXPORT_SYMBOL_GPL(usb_serial_deregister_drivers);
1439 
1440 /* Module information */
1441 MODULE_AUTHOR(DRIVER_AUTHOR);
1442 MODULE_DESCRIPTION(DRIVER_DESC);
1443 MODULE_LICENSE("GPL");
1444 
1445 module_param(debug, bool, S_IRUGO | S_IWUSR);
1446 MODULE_PARM_DESC(debug, "Debug enabled or not");
1447 

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