?  search:
summary | log | graphiclog1 | graphiclog2 | commit | commitdiff | tree | refs | edit | fork
blame | history | raw | HEAD
i2c-eg20t: change timeout value 50msec to 1000msec
[zen-stable.git] / drivers / usb / serial / usb-serial.c
blob584f23c7b999f96c0518e0e69fe60f0081e247ca
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 /* perform the standard setup */
218 retval = tty_init_termios(tty);
219 if (retval)
220 goto error_init_termios;
221
222 retval = usb_autopm_get_interface(serial->interface);
223 if (retval)
224 goto error_get_interface;
225
226 mutex_unlock(&serial->disc_mutex);
227
228 /* allow the driver to update the settings */
229 if (serial->type->init_termios)
230 serial->type->init_termios(tty);
231
232 tty->driver_data = port;
233
234 /* Final install (we use the default method) */
235 tty_driver_kref_get(driver);
236 tty->count++;
237 driver->ttys[idx] = tty;
238 return retval;
239
240 error_get_interface:
241 error_init_termios:
242 module_put(serial->type->driver.owner);
243 error_module_get:
244 error_no_port:
245 usb_serial_put(serial);
246 mutex_unlock(&serial->disc_mutex);
247 return retval;
248 }
249
250 static int serial_activate(struct tty_port *tport, struct tty_struct *tty)
251 {
252 struct usb_serial_port *port =
253 container_of(tport, struct usb_serial_port, port);
254 struct usb_serial *serial = port->serial;
255 int retval;
256
257 mutex_lock(&serial->disc_mutex);
258 if (serial->disconnected)
259 retval = -ENODEV;
260 else
261 retval = port->serial->type->open(tty, port);
262 mutex_unlock(&serial->disc_mutex);
263
264 if (retval < 0)
265 retval = usb_translate_errors(retval);
266
267 return retval;
268 }
269
270 static int serial_open(struct tty_struct *tty, struct file *filp)
271 {
272 struct usb_serial_port *port = tty->driver_data;
273
274 dbg("%s - port %d", __func__, port->number);
275 return tty_port_open(&port->port, tty, filp);
276 }
277
278 /**
279 * serial_down - shut down hardware
280 * @tport: tty port to shut down
281 *
282 * Shut down a USB serial port unless it is the console. We never
283 * shut down the console hardware as it will always be in use. Serialized
284 * against activate by the tport mutex and kept to matching open/close pairs
285 * of calls by the ASYNCB_INITIALIZED flag.
286 */
287 static void serial_down(struct tty_port *tport)
288 {
289 struct usb_serial_port *port =
290 container_of(tport, struct usb_serial_port, port);
291 struct usb_serial_driver *drv = port->serial->type;
292 /*
293 * The console is magical. Do not hang up the console hardware
294 * or there will be tears.
295 */
296 if (port->port.console)
297 return;
298 if (drv->close)
299 drv->close(port);
300 }
301
302 static void serial_hangup(struct tty_struct *tty)
303 {
304 struct usb_serial_port *port = tty->driver_data;
305 dbg("%s - port %d", __func__, port->number);
306 tty_port_hangup(&port->port);
307 }
308
309 static void serial_close(struct tty_struct *tty, struct file *filp)
310 {
311 struct usb_serial_port *port = tty->driver_data;
312 dbg("%s - port %d", __func__, port->number);
313 tty_port_close(&port->port, tty, filp);
314 }
315
316 /**
317 * serial_cleanup - free resources post close/hangup
318 * @port: port to free up
319 *
320 * Do the resource freeing and refcount dropping for the port.
321 * Avoid freeing the console.
322 *
323 * Called asynchronously after the last tty kref is dropped,
324 * and the tty layer has already done the tty_shutdown(tty);
325 */
326 static void serial_cleanup(struct tty_struct *tty)
327 {
328 struct usb_serial_port *port = tty->driver_data;
329 struct usb_serial *serial;
330 struct module *owner;
331
332 /* The console is magical. Do not hang up the console hardware
333 * or there will be tears.
334 */
335 if (port->port.console)
336 return;
337
338 dbg("%s - port %d", __func__, port->number);
339
340 tty->driver_data = NULL;
341
342 serial = port->serial;
343 owner = serial->type->driver.owner;
344
345 mutex_lock(&serial->disc_mutex);
346 if (!serial->disconnected)
347 usb_autopm_put_interface(serial->interface);
348 mutex_unlock(&serial->disc_mutex);
349
350 usb_serial_put(serial);
351 module_put(owner);
352 }
353
354 static int serial_write(struct tty_struct *tty, const unsigned char *buf,
355 int count)
356 {
357 struct usb_serial_port *port = tty->driver_data;
358 int retval = -ENODEV;
359
360 if (port->serial->dev->state == USB_STATE_NOTATTACHED)
361 goto exit;
362
363 dbg("%s - port %d, %d byte(s)", __func__, port->number, count);
364
365 /* pass on to the driver specific version of this function */
366 retval = port->serial->type->write(tty, port, buf, count);
367 if (retval < 0)
368 retval = usb_translate_errors(retval);
369 exit:
370 return retval;
371 }
372
373 static int serial_write_room(struct tty_struct *tty)
374 {
375 struct usb_serial_port *port = tty->driver_data;
376 dbg("%s - port %d", __func__, port->number);
377 /* pass on to the driver specific version of this function */
378 return port->serial->type->write_room(tty);
379 }
380
381 static int serial_chars_in_buffer(struct tty_struct *tty)
382 {
383 struct usb_serial_port *port = tty->driver_data;
384 dbg("%s - port %d", __func__, port->number);
385
386 /* if the device was unplugged then any remaining characters
387 fell out of the connector ;) */
388 if (port->serial->disconnected)
389 return 0;
390 /* pass on to the driver specific version of this function */
391 return port->serial->type->chars_in_buffer(tty);
392 }
393
394 static void serial_throttle(struct tty_struct *tty)
395 {
396 struct usb_serial_port *port = tty->driver_data;
397 dbg("%s - port %d", __func__, port->number);
398
399 /* pass on to the driver specific version of this function */
400 if (port->serial->type->throttle)
401 port->serial->type->throttle(tty);
402 }
403
404 static void serial_unthrottle(struct tty_struct *tty)
405 {
406 struct usb_serial_port *port = tty->driver_data;
407 dbg("%s - port %d", __func__, port->number);
408
409 /* pass on to the driver specific version of this function */
410 if (port->serial->type->unthrottle)
411 port->serial->type->unthrottle(tty);
412 }
413
414 static int serial_ioctl(struct tty_struct *tty,
415 unsigned int cmd, unsigned long arg)
416 {
417 struct usb_serial_port *port = tty->driver_data;
418 int retval = -ENODEV;
419
420 dbg("%s - port %d, cmd 0x%.4x", __func__, port->number, cmd);
421
422 /* pass on to the driver specific version of this function
423 if it is available */
424 if (port->serial->type->ioctl) {
425 retval = port->serial->type->ioctl(tty, cmd, arg);
426 } else
427 retval = -ENOIOCTLCMD;
428 return retval;
429 }
430
431 static void serial_set_termios(struct tty_struct *tty, struct ktermios *old)
432 {
433 struct usb_serial_port *port = tty->driver_data;
434 dbg("%s - port %d", __func__, port->number);
435
436 /* pass on to the driver specific version of this function
437 if it is available */
438 if (port->serial->type->set_termios)
439 port->serial->type->set_termios(tty, port, old);
440 else
441 tty_termios_copy_hw(tty->termios, old);
442 }
443
444 static int serial_break(struct tty_struct *tty, int break_state)
445 {
446 struct usb_serial_port *port = tty->driver_data;
447
448 dbg("%s - port %d", __func__, port->number);
449
450 /* pass on to the driver specific version of this function
451 if it is available */
452 if (port->serial->type->break_ctl)
453 port->serial->type->break_ctl(tty, break_state);
454 return 0;
455 }
456
457 static int serial_proc_show(struct seq_file *m, void *v)
458 {
459 struct usb_serial *serial;
460 int i;
461 char tmp[40];
462
463 dbg("%s", __func__);
464 seq_puts(m, "usbserinfo:1.0 driver:2.0\n");
465 for (i = 0; i < SERIAL_TTY_MINORS; ++i) {
466 serial = usb_serial_get_by_index(i);
467 if (serial == NULL)
468 continue;
469
470 seq_printf(m, "%d:", i);
471 if (serial->type->driver.owner)
472 seq_printf(m, " module:%s",
473 module_name(serial->type->driver.owner));
474 seq_printf(m, " name:\"%s\"",
475 serial->type->description);
476 seq_printf(m, " vendor:%04x product:%04x",
477 le16_to_cpu(serial->dev->descriptor.idVendor),
478 le16_to_cpu(serial->dev->descriptor.idProduct));
479 seq_printf(m, " num_ports:%d", serial->num_ports);
480 seq_printf(m, " port:%d", i - serial->minor + 1);
481 usb_make_path(serial->dev, tmp, sizeof(tmp));
482 seq_printf(m, " path:%s", tmp);
483
484 seq_putc(m, '\n');
485 usb_serial_put(serial);
486 mutex_unlock(&serial->disc_mutex);
487 }
488 return 0;
489 }
490
491 static int serial_proc_open(struct inode *inode, struct file *file)
492 {
493 return single_open(file, serial_proc_show, NULL);
494 }
495
496 static const struct file_operations serial_proc_fops = {
497 .owner = THIS_MODULE,
498 .open = serial_proc_open,
499 .read = seq_read,
500 .llseek = seq_lseek,
501 .release = single_release,
502 };
503
504 static int serial_tiocmget(struct tty_struct *tty)
505 {
506 struct usb_serial_port *port = tty->driver_data;
507
508 dbg("%s - port %d", __func__, port->number);
509
510 if (port->serial->type->tiocmget)
511 return port->serial->type->tiocmget(tty);
512 return -EINVAL;
513 }
514
515 static int serial_tiocmset(struct tty_struct *tty,
516 unsigned int set, unsigned int clear)
517 {
518 struct usb_serial_port *port = tty->driver_data;
519
520 dbg("%s - port %d", __func__, port->number);
521
522 if (port->serial->type->tiocmset)
523 return port->serial->type->tiocmset(tty, set, clear);
524 return -EINVAL;
525 }
526
527 static int serial_get_icount(struct tty_struct *tty,
528 struct serial_icounter_struct *icount)
529 {
530 struct usb_serial_port *port = tty->driver_data;
531
532 dbg("%s - port %d", __func__, port->number);
533
534 if (port->serial->type->get_icount)
535 return port->serial->type->get_icount(tty, icount);
536 return -EINVAL;
537 }
538
539 /*
540 * We would be calling tty_wakeup here, but unfortunately some line
541 * disciplines have an annoying habit of calling tty->write from
542 * the write wakeup callback (e.g. n_hdlc.c).
543 */
544 void usb_serial_port_softint(struct usb_serial_port *port)
545 {
546 schedule_work(&port->work);
547 }
548 EXPORT_SYMBOL_GPL(usb_serial_port_softint);
549
550 static void usb_serial_port_work(struct work_struct *work)
551 {
552 struct usb_serial_port *port =
553 container_of(work, struct usb_serial_port, work);
554 struct tty_struct *tty;
555
556 dbg("%s - port %d", __func__, port->number);
557
558 tty = tty_port_tty_get(&port->port);
559 if (!tty)
560 return;
561
562 tty_wakeup(tty);
563 tty_kref_put(tty);
564 }
565
566 static void kill_traffic(struct usb_serial_port *port)
567 {
568 int i;
569
570 for (i = 0; i < ARRAY_SIZE(port->read_urbs); ++i)
571 usb_kill_urb(port->read_urbs[i]);
572 for (i = 0; i < ARRAY_SIZE(port->write_urbs); ++i)
573 usb_kill_urb(port->write_urbs[i]);
574 /*
575 * This is tricky.
576 * Some drivers submit the read_urb in the
577 * handler for the write_urb or vice versa
578 * this order determines the order in which
579 * usb_kill_urb() must be used to reliably
580 * kill the URBs. As it is unknown here,
581 * both orders must be used in turn.
582 * The call below is not redundant.
583 */
584 usb_kill_urb(port->read_urb);
585 usb_kill_urb(port->interrupt_in_urb);
586 usb_kill_urb(port->interrupt_out_urb);
587 }
588
589 static void port_release(struct device *dev)
590 {
591 struct usb_serial_port *port = to_usb_serial_port(dev);
592 int i;
593
594 dbg ("%s - %s", __func__, dev_name(dev));
595
596 /*
597 * Stop all the traffic before cancelling the work, so that
598 * nobody will restart it by calling usb_serial_port_softint.
599 */
600 kill_traffic(port);
601 cancel_work_sync(&port->work);
602
603 usb_free_urb(port->interrupt_in_urb);
604 usb_free_urb(port->interrupt_out_urb);
605 for (i = 0; i < ARRAY_SIZE(port->read_urbs); ++i) {
606 usb_free_urb(port->read_urbs[i]);
607 kfree(port->bulk_in_buffers[i]);
608 }
609 for (i = 0; i < ARRAY_SIZE(port->write_urbs); ++i) {
610 usb_free_urb(port->write_urbs[i]);
611 kfree(port->bulk_out_buffers[i]);
612 }
613 kfifo_free(&port->write_fifo);
614 kfree(port->interrupt_in_buffer);
615 kfree(port->interrupt_out_buffer);
616 kfree(port);
617 }
618
619 static struct usb_serial *create_serial(struct usb_device *dev,
620 struct usb_interface *interface,
621 struct usb_serial_driver *driver)
622 {
623 struct usb_serial *serial;
624
625 serial = kzalloc(sizeof(*serial), GFP_KERNEL);
626 if (!serial) {
627 dev_err(&dev->dev, "%s - out of memory\n", __func__);
628 return NULL;
629 }
630 serial->dev = usb_get_dev(dev);
631 serial->type = driver;
632 serial->interface = interface;
633 kref_init(&serial->kref);
634 mutex_init(&serial->disc_mutex);
635 serial->minor = SERIAL_TTY_NO_MINOR;
636
637 return serial;
638 }
639
640 static const struct usb_device_id *match_dynamic_id(struct usb_interface *intf,
641 struct usb_serial_driver *drv)
642 {
643 struct usb_dynid *dynid;
644
645 spin_lock(&drv->dynids.lock);
646 list_for_each_entry(dynid, &drv->dynids.list, node) {
647 if (usb_match_one_id(intf, &dynid->id)) {
648 spin_unlock(&drv->dynids.lock);
649 return &dynid->id;
650 }
651 }
652 spin_unlock(&drv->dynids.lock);
653 return NULL;
654 }
655
656 static const struct usb_device_id *get_iface_id(struct usb_serial_driver *drv,
657 struct usb_interface *intf)
658 {
659 const struct usb_device_id *id;
660
661 id = usb_match_id(intf, drv->id_table);
662 if (id) {
663 dbg("static descriptor matches");
664 goto exit;
665 }
666 id = match_dynamic_id(intf, drv);
667 if (id)
668 dbg("dynamic descriptor matches");
669 exit:
670 return id;
671 }
672
673 /* Caller must hold table_lock */
674 static struct usb_serial_driver *search_serial_device(
675 struct usb_interface *iface)
676 {
677 const struct usb_device_id *id;
678 struct usb_serial_driver *drv;
679
680 /* Check if the usb id matches a known device */
681 list_for_each_entry(drv, &usb_serial_driver_list, driver_list) {
682 id = get_iface_id(drv, iface);
683 if (id)
684 return drv;
685 }
686
687 return NULL;
688 }
689
690 static int serial_carrier_raised(struct tty_port *port)
691 {
692 struct usb_serial_port *p = container_of(port, struct usb_serial_port, port);
693 struct usb_serial_driver *drv = p->serial->type;
694
695 if (drv->carrier_raised)
696 return drv->carrier_raised(p);
697 /* No carrier control - don't block */
698 return 1;
699 }
700
701 static void serial_dtr_rts(struct tty_port *port, int on)
702 {
703 struct usb_serial_port *p = container_of(port, struct usb_serial_port, port);
704 struct usb_serial_driver *drv = p->serial->type;
705
706 if (drv->dtr_rts)
707 drv->dtr_rts(p, on);
708 }
709
710 static const struct tty_port_operations serial_port_ops = {
711 .carrier_raised = serial_carrier_raised,
712 .dtr_rts = serial_dtr_rts,
713 .activate = serial_activate,
714 .shutdown = serial_down,
715 };
716
717 int usb_serial_probe(struct usb_interface *interface,
718 const struct usb_device_id *id)
719 {
720 struct usb_device *dev = interface_to_usbdev(interface);
721 struct usb_serial *serial = NULL;
722 struct usb_serial_port *port;
723 struct usb_host_interface *iface_desc;
724 struct usb_endpoint_descriptor *endpoint;
725 struct usb_endpoint_descriptor *interrupt_in_endpoint[MAX_NUM_PORTS];
726 struct usb_endpoint_descriptor *interrupt_out_endpoint[MAX_NUM_PORTS];
727 struct usb_endpoint_descriptor *bulk_in_endpoint[MAX_NUM_PORTS];
728 struct usb_endpoint_descriptor *bulk_out_endpoint[MAX_NUM_PORTS];
729 struct usb_serial_driver *type = NULL;
730 int retval;
731 unsigned int minor;
732 int buffer_size;
733 int i;
734 int j;
735 int num_interrupt_in = 0;
736 int num_interrupt_out = 0;
737 int num_bulk_in = 0;
738 int num_bulk_out = 0;
739 int num_ports = 0;
740 int max_endpoints;
741
742 mutex_lock(&table_lock);
743 type = search_serial_device(interface);
744 if (!type) {
745 mutex_unlock(&table_lock);
746 dbg("none matched");
747 return -ENODEV;
748 }
749
750 if (!try_module_get(type->driver.owner)) {
751 mutex_unlock(&table_lock);
752 dev_err(&interface->dev, "module get failed, exiting\n");
753 return -EIO;
754 }
755 mutex_unlock(&table_lock);
756
757 serial = create_serial(dev, interface, type);
758 if (!serial) {
759 module_put(type->driver.owner);
760 dev_err(&interface->dev, "%s - out of memory\n", __func__);
761 return -ENOMEM;
762 }
763
764 /* if this device type has a probe function, call it */
765 if (type->probe) {
766 const struct usb_device_id *id;
767
768 id = get_iface_id(type, interface);
769 retval = type->probe(serial, id);
770
771 if (retval) {
772 dbg("sub driver rejected device");
773 kfree(serial);
774 module_put(type->driver.owner);
775 return retval;
776 }
777 }
778
779 /* descriptor matches, let's find the endpoints needed */
780 /* check out the endpoints */
781 iface_desc = interface->cur_altsetting;
782 for (i = 0; i < iface_desc->desc.bNumEndpoints; ++i) {
783 endpoint = &iface_desc->endpoint[i].desc;
784
785 if (usb_endpoint_is_bulk_in(endpoint)) {
786 /* we found a bulk in endpoint */
787 dbg("found bulk in on endpoint %d", i);
788 bulk_in_endpoint[num_bulk_in] = endpoint;
789 ++num_bulk_in;
790 }
791
792 if (usb_endpoint_is_bulk_out(endpoint)) {
793 /* we found a bulk out endpoint */
794 dbg("found bulk out on endpoint %d", i);
795 bulk_out_endpoint[num_bulk_out] = endpoint;
796 ++num_bulk_out;
797 }
798
799 if (usb_endpoint_is_int_in(endpoint)) {
800 /* we found a interrupt in endpoint */
801 dbg("found interrupt in on endpoint %d", i);
802 interrupt_in_endpoint[num_interrupt_in] = endpoint;
803 ++num_interrupt_in;
804 }
805
806 if (usb_endpoint_is_int_out(endpoint)) {
807 /* we found an interrupt out endpoint */
808 dbg("found interrupt out on endpoint %d", i);
809 interrupt_out_endpoint[num_interrupt_out] = endpoint;
810 ++num_interrupt_out;
811 }
812 }
813
814 #if defined(CONFIG_USB_SERIAL_PL2303) || defined(CONFIG_USB_SERIAL_PL2303_MODULE)
815 /* BEGIN HORRIBLE HACK FOR PL2303 */
816 /* this is needed due to the looney way its endpoints are set up */
817 if (((le16_to_cpu(dev->descriptor.idVendor) == PL2303_VENDOR_ID) &&
818 (le16_to_cpu(dev->descriptor.idProduct) == PL2303_PRODUCT_ID)) ||
819 ((le16_to_cpu(dev->descriptor.idVendor) == ATEN_VENDOR_ID) &&
820 (le16_to_cpu(dev->descriptor.idProduct) == ATEN_PRODUCT_ID)) ||
821 ((le16_to_cpu(dev->descriptor.idVendor) == ALCOR_VENDOR_ID) &&
822 (le16_to_cpu(dev->descriptor.idProduct) == ALCOR_PRODUCT_ID)) ||
823 ((le16_to_cpu(dev->descriptor.idVendor) == SIEMENS_VENDOR_ID) &&
824 (le16_to_cpu(dev->descriptor.idProduct) == SIEMENS_PRODUCT_ID_EF81))) {
825 if (interface != dev->actconfig->interface[0]) {
826 /* check out the endpoints of the other interface*/
827 iface_desc = dev->actconfig->interface[0]->cur_altsetting;
828 for (i = 0; i < iface_desc->desc.bNumEndpoints; ++i) {
829 endpoint = &iface_desc->endpoint[i].desc;
830 if (usb_endpoint_is_int_in(endpoint)) {
831 /* we found a interrupt in endpoint */
832 dbg("found interrupt in for Prolific device on separate interface");
833 interrupt_in_endpoint[num_interrupt_in] = endpoint;
834 ++num_interrupt_in;
835 }
836 }
837 }
838
839 /* Now make sure the PL-2303 is configured correctly.
840 * If not, give up now and hope this hack will work
841 * properly during a later invocation of usb_serial_probe
842 */
843 if (num_bulk_in == 0 || num_bulk_out == 0) {
844 dev_info(&interface->dev, "PL-2303 hack: descriptors matched but endpoints did not\n");
845 kfree(serial);
846 module_put(type->driver.owner);
847 return -ENODEV;
848 }
849 }
850 /* END HORRIBLE HACK FOR PL2303 */
851 #endif
852
853 #ifdef CONFIG_USB_SERIAL_GENERIC
854 if (type == &usb_serial_generic_device) {
855 num_ports = num_bulk_out;
856 if (num_ports == 0) {
857 dev_err(&interface->dev,
858 "Generic device with no bulk out, not allowed.\n");
859 kfree(serial);
860 module_put(type->driver.owner);
861 return -EIO;
862 }
863 }
864 #endif
865 if (!num_ports) {
866 /* if this device type has a calc_num_ports function, call it */
867 if (type->calc_num_ports)
868 num_ports = type->calc_num_ports(serial);
869 if (!num_ports)
870 num_ports = type->num_ports;
871 }
872
873 serial->num_ports = num_ports;
874 serial->num_bulk_in = num_bulk_in;
875 serial->num_bulk_out = num_bulk_out;
876 serial->num_interrupt_in = num_interrupt_in;
877 serial->num_interrupt_out = num_interrupt_out;
878
879 /* found all that we need */
880 dev_info(&interface->dev, "%s converter detected\n",
881 type->description);
882
883 /* create our ports, we need as many as the max endpoints */
884 /* we don't use num_ports here because some devices have more
885 endpoint pairs than ports */
886 max_endpoints = max(num_bulk_in, num_bulk_out);
887 max_endpoints = max(max_endpoints, num_interrupt_in);
888 max_endpoints = max(max_endpoints, num_interrupt_out);
889 max_endpoints = max(max_endpoints, (int)serial->num_ports);
890 serial->num_port_pointers = max_endpoints;
891
892 dbg("%s - setting up %d port structures for this device",
893 __func__, max_endpoints);
894 for (i = 0; i < max_endpoints; ++i) {
895 port = kzalloc(sizeof(struct usb_serial_port), GFP_KERNEL);
896 if (!port)
897 goto probe_error;
898 tty_port_init(&port->port);
899 port->port.ops = &serial_port_ops;
900 port->serial = serial;
901 spin_lock_init(&port->lock);
902 /* Keep this for private driver use for the moment but
903 should probably go away */
904 INIT_WORK(&port->work, usb_serial_port_work);
905 serial->port[i] = port;
906 port->dev.parent = &interface->dev;
907 port->dev.driver = NULL;
908 port->dev.bus = &usb_serial_bus_type;
909 port->dev.release = &port_release;
910 device_initialize(&port->dev);
911 }
912
913 /* set up the endpoint information */
914 for (i = 0; i < num_bulk_in; ++i) {
915 endpoint = bulk_in_endpoint[i];
916 port = serial->port[i];
917 buffer_size = max_t(int, serial->type->bulk_in_size,
918 usb_endpoint_maxp(endpoint));
919 port->bulk_in_size = buffer_size;
920 port->bulk_in_endpointAddress = endpoint->bEndpointAddress;
921
922 for (j = 0; j < ARRAY_SIZE(port->read_urbs); ++j) {
923 set_bit(j, &port->read_urbs_free);
924 port->read_urbs[j] = usb_alloc_urb(0, GFP_KERNEL);
925 if (!port->read_urbs[j]) {
926 dev_err(&interface->dev,
927 "No free urbs available\n");
928 goto probe_error;
929 }
930 port->bulk_in_buffers[j] = kmalloc(buffer_size,
931 GFP_KERNEL);
932 if (!port->bulk_in_buffers[j]) {
933 dev_err(&interface->dev,
934 "Couldn't allocate bulk_in_buffer\n");
935 goto probe_error;
936 }
937 usb_fill_bulk_urb(port->read_urbs[j], dev,
938 usb_rcvbulkpipe(dev,
939 endpoint->bEndpointAddress),
940 port->bulk_in_buffers[j], buffer_size,
941 serial->type->read_bulk_callback,
942 port);
943 }
944
945 port->read_urb = port->read_urbs[0];
946 port->bulk_in_buffer = port->bulk_in_buffers[0];
947 }
948
949 for (i = 0; i < num_bulk_out; ++i) {
950 endpoint = bulk_out_endpoint[i];
951 port = serial->port[i];
952 if (kfifo_alloc(&port->write_fifo, PAGE_SIZE, GFP_KERNEL))
953 goto probe_error;
954 buffer_size = serial->type->bulk_out_size;
955 if (!buffer_size)
956 buffer_size = usb_endpoint_maxp(endpoint);
957 port->bulk_out_size = buffer_size;
958 port->bulk_out_endpointAddress = endpoint->bEndpointAddress;
959
960 for (j = 0; j < ARRAY_SIZE(port->write_urbs); ++j) {
961 set_bit(j, &port->write_urbs_free);
962 port->write_urbs[j] = usb_alloc_urb(0, GFP_KERNEL);
963 if (!port->write_urbs[j]) {
964 dev_err(&interface->dev,
965 "No free urbs available\n");
966 goto probe_error;
967 }
968 port->bulk_out_buffers[j] = kmalloc(buffer_size,
969 GFP_KERNEL);
970 if (!port->bulk_out_buffers[j]) {
971 dev_err(&interface->dev,
972 "Couldn't allocate bulk_out_buffer\n");
973 goto probe_error;
974 }
975 usb_fill_bulk_urb(port->write_urbs[j], dev,
976 usb_sndbulkpipe(dev,
977 endpoint->bEndpointAddress),
978 port->bulk_out_buffers[j], buffer_size,
979 serial->type->write_bulk_callback,
980 port);
981 }
982
983 port->write_urb = port->write_urbs[0];
984 port->bulk_out_buffer = port->bulk_out_buffers[0];
985 }
986
987 if (serial->type->read_int_callback) {
988 for (i = 0; i < num_interrupt_in; ++i) {
989 endpoint = interrupt_in_endpoint[i];
990 port = serial->port[i];
991 port->interrupt_in_urb = usb_alloc_urb(0, GFP_KERNEL);
992 if (!port->interrupt_in_urb) {
993 dev_err(&interface->dev,
994 "No free urbs available\n");
995 goto probe_error;
996 }
997 buffer_size = usb_endpoint_maxp(endpoint);
998 port->interrupt_in_endpointAddress =
999 endpoint->bEndpointAddress;
1000 port->interrupt_in_buffer = kmalloc(buffer_size,
1001 GFP_KERNEL);
1002 if (!port->interrupt_in_buffer) {
1003 dev_err(&interface->dev,
1004 "Couldn't allocate interrupt_in_buffer\n");
1005 goto probe_error;
1006 }
1007 usb_fill_int_urb(port->interrupt_in_urb, dev,
1008 usb_rcvintpipe(dev,
1009 endpoint->bEndpointAddress),
1010 port->interrupt_in_buffer, buffer_size,
1011 serial->type->read_int_callback, port,
1012 endpoint->bInterval);
1013 }
1014 } else if (num_interrupt_in) {
1015 dbg("the device claims to support interrupt in transfers, but read_int_callback is not defined");
1016 }
1017
1018 if (serial->type->write_int_callback) {
1019 for (i = 0; i < num_interrupt_out; ++i) {
1020 endpoint = interrupt_out_endpoint[i];
1021 port = serial->port[i];
1022 port->interrupt_out_urb = usb_alloc_urb(0, GFP_KERNEL);
1023 if (!port->interrupt_out_urb) {
1024 dev_err(&interface->dev,
1025 "No free urbs available\n");
1026 goto probe_error;
1027 }
1028 buffer_size = usb_endpoint_maxp(endpoint);
1029 port->interrupt_out_size = buffer_size;
1030 port->interrupt_out_endpointAddress =
1031 endpoint->bEndpointAddress;
1032 port->interrupt_out_buffer = kmalloc(buffer_size,
1033 GFP_KERNEL);
1034 if (!port->interrupt_out_buffer) {
1035 dev_err(&interface->dev,
1036 "Couldn't allocate interrupt_out_buffer\n");
1037 goto probe_error;
1038 }
1039 usb_fill_int_urb(port->interrupt_out_urb, dev,
1040 usb_sndintpipe(dev,
1041 endpoint->bEndpointAddress),
1042 port->interrupt_out_buffer, buffer_size,
1043 serial->type->write_int_callback, port,
1044 endpoint->bInterval);
1045 }
1046 } else if (num_interrupt_out) {
1047 dbg("the device claims to support interrupt out transfers, but write_int_callback is not defined");
1048 }
1049
1050 /* if this device type has an attach function, call it */
1051 if (type->attach) {
1052 retval = type->attach(serial);
1053 if (retval < 0)
1054 goto probe_error;
1055 serial->attached = 1;
1056 if (retval > 0) {
1057 /* quietly accept this device, but don't bind to a
1058 serial port as it's about to disappear */
1059 serial->num_ports = 0;
1060 goto exit;
1061 }
1062 } else {
1063 serial->attached = 1;
1064 }
1065
1066 /* Avoid race with tty_open and serial_install by setting the
1067 * disconnected flag and not clearing it until all ports have been
1068 * registered.
1069 */
1070 serial->disconnected = 1;
1071
1072 if (get_free_serial(serial, num_ports, &minor) == NULL) {
1073 dev_err(&interface->dev, "No more free serial devices\n");
1074 goto probe_error;
1075 }
1076 serial->minor = minor;
1077
1078 /* register all of the individual ports with the driver core */
1079 for (i = 0; i < num_ports; ++i) {
1080 port = serial->port[i];
1081 dev_set_name(&port->dev, "ttyUSB%d", port->number);
1082 dbg ("%s - registering %s", __func__, dev_name(&port->dev));
1083 port->dev_state = PORT_REGISTERING;
1084 device_enable_async_suspend(&port->dev);
1085
1086 retval = device_add(&port->dev);
1087 if (retval) {
1088 dev_err(&port->dev, "Error registering port device, "
1089 "continuing\n");
1090 port->dev_state = PORT_UNREGISTERED;
1091 } else {
1092 port->dev_state = PORT_REGISTERED;
1093 }
1094 }
1095
1096 serial->disconnected = 0;
1097
1098 usb_serial_console_init(debug, minor);
1099
1100 exit:
1101 /* success */
1102 usb_set_intfdata(interface, serial);
1103 module_put(type->driver.owner);
1104 return 0;
1105
1106 probe_error:
1107 usb_serial_put(serial);
1108 module_put(type->driver.owner);
1109 return -EIO;
1110 }
1111 EXPORT_SYMBOL_GPL(usb_serial_probe);
1112
1113 void usb_serial_disconnect(struct usb_interface *interface)
1114 {
1115 int i;
1116 struct usb_serial *serial = usb_get_intfdata(interface);
1117 struct device *dev = &interface->dev;
1118 struct usb_serial_port *port;
1119
1120 usb_serial_console_disconnect(serial);
1121 dbg("%s", __func__);
1122
1123 mutex_lock(&serial->disc_mutex);
1124 usb_set_intfdata(interface, NULL);
1125 /* must set a flag, to signal subdrivers */
1126 serial->disconnected = 1;
1127 mutex_unlock(&serial->disc_mutex);
1128
1129 for (i = 0; i < serial->num_ports; ++i) {
1130 port = serial->port[i];
1131 if (port) {
1132 struct tty_struct *tty = tty_port_tty_get(&port->port);
1133 if (tty) {
1134 tty_vhangup(tty);
1135 tty_kref_put(tty);
1136 }
1137 kill_traffic(port);
1138 cancel_work_sync(&port->work);
1139 if (port->dev_state == PORT_REGISTERED) {
1140
1141 /* Make sure the port is bound so that the
1142 * driver's port_remove method is called.
1143 */
1144 if (!port->dev.driver) {
1145 int rc;
1146
1147 port->dev.driver =
1148 &serial->type->driver;
1149 rc = device_bind_driver(&port->dev);
1150 }
1151 port->dev_state = PORT_UNREGISTERING;
1152 device_del(&port->dev);
1153 port->dev_state = PORT_UNREGISTERED;
1154 }
1155 }
1156 }
1157 serial->type->disconnect(serial);
1158
1159 /* let the last holder of this object cause it to be cleaned up */
1160 usb_serial_put(serial);
1161 dev_info(dev, "device disconnected\n");
1162 }
1163 EXPORT_SYMBOL_GPL(usb_serial_disconnect);
1164
1165 int usb_serial_suspend(struct usb_interface *intf, pm_message_t message)
1166 {
1167 struct usb_serial *serial = usb_get_intfdata(intf);
1168 struct usb_serial_port *port;
1169 int i, r = 0;
1170
1171 serial->suspending = 1;
1172
1173 if (serial->type->suspend) {
1174 r = serial->type->suspend(serial, message);
1175 if (r < 0) {
1176 serial->suspending = 0;
1177 goto err_out;
1178 }
1179 }
1180
1181 for (i = 0; i < serial->num_ports; ++i) {
1182 port = serial->port[i];
1183 if (port)
1184 kill_traffic(port);
1185 }
1186
1187 err_out:
1188 return r;
1189 }
1190 EXPORT_SYMBOL(usb_serial_suspend);
1191
1192 int usb_serial_resume(struct usb_interface *intf)
1193 {
1194 struct usb_serial *serial = usb_get_intfdata(intf);
1195 int rv;
1196
1197 serial->suspending = 0;
1198 if (serial->type->resume)
1199 rv = serial->type->resume(serial);
1200 else
1201 rv = usb_serial_generic_resume(serial);
1202
1203 return rv;
1204 }
1205 EXPORT_SYMBOL(usb_serial_resume);
1206
1207 static const struct tty_operations serial_ops = {
1208 .open = serial_open,
1209 .close = serial_close,
1210 .write = serial_write,
1211 .hangup = serial_hangup,
1212 .write_room = serial_write_room,
1213 .ioctl = serial_ioctl,
1214 .set_termios = serial_set_termios,
1215 .throttle = serial_throttle,
1216 .unthrottle = serial_unthrottle,
1217 .break_ctl = serial_break,
1218 .chars_in_buffer = serial_chars_in_buffer,
1219 .tiocmget = serial_tiocmget,
1220 .tiocmset = serial_tiocmset,
1221 .get_icount = serial_get_icount,
1222 .cleanup = serial_cleanup,
1223 .install = serial_install,
1224 .proc_fops = &serial_proc_fops,
1225 };
1226
1227
1228 struct tty_driver *usb_serial_tty_driver;
1229
1230 static int __init usb_serial_init(void)
1231 {
1232 int i;
1233 int result;
1234
1235 usb_serial_tty_driver = alloc_tty_driver(SERIAL_TTY_MINORS);
1236 if (!usb_serial_tty_driver)
1237 return -ENOMEM;
1238
1239 /* Initialize our global data */
1240 for (i = 0; i < SERIAL_TTY_MINORS; ++i)
1241 serial_table[i] = NULL;
1242
1243 result = bus_register(&usb_serial_bus_type);
1244 if (result) {
1245 printk(KERN_ERR "usb-serial: %s - registering bus driver "
1246 "failed\n", __func__);
1247 goto exit_bus;
1248 }
1249
1250 usb_serial_tty_driver->owner = THIS_MODULE;
1251 usb_serial_tty_driver->driver_name = "usbserial";
1252 usb_serial_tty_driver->name = "ttyUSB";
1253 usb_serial_tty_driver->major = SERIAL_TTY_MAJOR;
1254 usb_serial_tty_driver->minor_start = 0;
1255 usb_serial_tty_driver->type = TTY_DRIVER_TYPE_SERIAL;
1256 usb_serial_tty_driver->subtype = SERIAL_TYPE_NORMAL;
1257 usb_serial_tty_driver->flags = TTY_DRIVER_REAL_RAW |
1258 TTY_DRIVER_DYNAMIC_DEV;
1259 usb_serial_tty_driver->init_termios = tty_std_termios;
1260 usb_serial_tty_driver->init_termios.c_cflag = B9600 | CS8 | CREAD
1261 | HUPCL | CLOCAL;
1262 usb_serial_tty_driver->init_termios.c_ispeed = 9600;
1263 usb_serial_tty_driver->init_termios.c_ospeed = 9600;
1264 tty_set_operations(usb_serial_tty_driver, &serial_ops);
1265 result = tty_register_driver(usb_serial_tty_driver);
1266 if (result) {
1267 printk(KERN_ERR "usb-serial: %s - tty_register_driver failed\n",
1268 __func__);
1269 goto exit_reg_driver;
1270 }
1271
1272 /* register the USB driver */
1273 result = usb_register(&usb_serial_driver);
1274 if (result < 0) {
1275 printk(KERN_ERR "usb-serial: %s - usb_register failed\n",
1276 __func__);
1277 goto exit_tty;
1278 }
1279
1280 /* register the generic driver, if we should */
1281 result = usb_serial_generic_register(debug);
1282 if (result < 0) {
1283 printk(KERN_ERR "usb-serial: %s - registering generic "
1284 "driver failed\n", __func__);
1285 goto exit_generic;
1286 }
1287
1288 printk(KERN_INFO KBUILD_MODNAME ": " DRIVER_DESC "\n");
1289
1290 return result;
1291
1292 exit_generic:
1293 usb_deregister(&usb_serial_driver);
1294
1295 exit_tty:
1296 tty_unregister_driver(usb_serial_tty_driver);
1297
1298 exit_reg_driver:
1299 bus_unregister(&usb_serial_bus_type);
1300
1301 exit_bus:
1302 printk(KERN_ERR "usb-serial: %s - returning with error %d\n",
1303 __func__, result);
1304 put_tty_driver(usb_serial_tty_driver);
1305 return result;
1306 }
1307
1308
1309 static void __exit usb_serial_exit(void)
1310 {
1311 usb_serial_console_exit();
1312
1313 usb_serial_generic_deregister();
1314
1315 usb_deregister(&usb_serial_driver);
1316 tty_unregister_driver(usb_serial_tty_driver);
1317 put_tty_driver(usb_serial_tty_driver);
1318 bus_unregister(&usb_serial_bus_type);
1319 }
1320
1321
1322 module_init(usb_serial_init);
1323 module_exit(usb_serial_exit);
1324
1325 #define set_to_generic_if_null(type, function) \
1326 do { \
1327 if (!type->function) { \
1328 type->function = usb_serial_generic_##function; \
1329 dbg("Had to override the " #function \
1330 " usb serial operation with the generic one.");\
1331 } \
1332 } while (0)
1333
1334 static void fixup_generic(struct usb_serial_driver *device)
1335 {
1336 set_to_generic_if_null(device, open);
1337 set_to_generic_if_null(device, write);
1338 set_to_generic_if_null(device, close);
1339 set_to_generic_if_null(device, write_room);
1340 set_to_generic_if_null(device, chars_in_buffer);
1341 set_to_generic_if_null(device, read_bulk_callback);
1342 set_to_generic_if_null(device, write_bulk_callback);
1343 set_to_generic_if_null(device, disconnect);
1344 set_to_generic_if_null(device, release);
1345 set_to_generic_if_null(device, process_read_urb);
1346 set_to_generic_if_null(device, prepare_write_buffer);
1347 }
1348
1349 int usb_serial_register(struct usb_serial_driver *driver)
1350 {
1351 int retval;
1352
1353 if (usb_disabled())
1354 return -ENODEV;
1355
1356 fixup_generic(driver);
1357
1358 if (!driver->description)
1359 driver->description = driver->driver.name;
1360 if (!driver->usb_driver) {
1361 WARN(1, "Serial driver %s has no usb_driver\n",
1362 driver->description);
1363 return -EINVAL;
1364 }
1365 driver->usb_driver->supports_autosuspend = 1;
1366
1367 /* Add this device to our list of devices */
1368 mutex_lock(&table_lock);
1369 list_add(&driver->driver_list, &usb_serial_driver_list);
1370
1371 retval = usb_serial_bus_register(driver);
1372 if (retval) {
1373 printk(KERN_ERR "usb-serial: problem %d when registering "
1374 "driver %s\n", retval, driver->description);
1375 list_del(&driver->driver_list);
1376 } else
1377 printk(KERN_INFO "USB Serial support registered for %s\n",
1378 driver->description);
1379
1380 mutex_unlock(&table_lock);
1381 return retval;
1382 }
1383 EXPORT_SYMBOL_GPL(usb_serial_register);
1384
1385
1386 void usb_serial_deregister(struct usb_serial_driver *device)
1387 {
1388 printk(KERN_INFO "USB Serial deregistering driver %s\n",
1389 device->description);
1390 mutex_lock(&table_lock);
1391 list_del(&device->driver_list);
1392 usb_serial_bus_deregister(device);
1393 mutex_unlock(&table_lock);
1394 }
1395 EXPORT_SYMBOL_GPL(usb_serial_deregister);
1396
1397 /* Module information */
1398 MODULE_AUTHOR(DRIVER_AUTHOR);
1399 MODULE_DESCRIPTION(DRIVER_DESC);
1400 MODULE_LICENSE("GPL");
1401
1402 module_param(debug, bool, S_IRUGO | S_IWUSR);
1403 MODULE_PARM_DESC(debug, "Debug enabled or not");