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Merge branch 'upstream-linus' of master.kernel.org:/pub/scm/linux/kernel/git/jgarzik...
[linux-2.6.22.y-op.git] / drivers / usb / serial / option.c
blob7716000045b73dd632d41f1104c9696b8d715077
1 /*
2 Option Card (PCMCIA to) USB to Serial Driver
3
4 Copyright (C) 2005 Matthias Urlichs <smurf@smurf.noris.de>
5
6 This driver is free software; you can redistribute it and/or modify
7 it under the terms of Version 2 of the GNU General Public License as
8 published by the Free Software Foundation.
9
10 Portions copied from the Keyspan driver by Hugh Blemings <hugh@blemings.org>
11
12 History:
13
14 2005-05-19 v0.1 Initial version, based on incomplete docs
15 and analysis of misbehavior with the standard driver
16 2005-05-20 v0.2 Extended the input buffer to avoid losing
17 random 64-byte chunks of data
18 2005-05-21 v0.3 implemented chars_in_buffer()
19 turned on low_latency
20 simplified the code somewhat
21 2005-05-24 v0.4 option_write() sometimes deadlocked under heavy load
22 removed some dead code
23 added sponsor notice
24 coding style clean-up
25 2005-06-20 v0.4.1 add missing braces :-/
26 killed end-of-line whitespace
27 2005-07-15 v0.4.2 rename WLAN product to FUSION, add FUSION2
28 2005-09-10 v0.4.3 added HUAWEI E600 card and Audiovox AirCard
29 2005-09-20 v0.4.4 increased recv buffer size: the card sometimes
30 wants to send >2000 bytes.
31
32 Work sponsored by: Sigos GmbH, Germany <info@sigos.de>
33
34 */
35
36 #define DRIVER_VERSION "v0.4"
37 #define DRIVER_AUTHOR "Matthias Urlichs <smurf@smurf.noris.de>"
38 #define DRIVER_DESC "Option Card (PC-Card to) USB to Serial Driver"
39
40 #include <linux/config.h>
41 #include <linux/kernel.h>
42 #include <linux/jiffies.h>
43 #include <linux/errno.h>
44 #include <linux/tty.h>
45 #include <linux/tty_flip.h>
46 #include <linux/module.h>
47 #include <linux/usb.h>
48 #include "usb-serial.h"
49
50 /* Function prototypes */
51 static int option_open(struct usb_serial_port *port, struct file *filp);
52 static void option_close(struct usb_serial_port *port, struct file *filp);
53 static int option_startup(struct usb_serial *serial);
54 static void option_shutdown(struct usb_serial *serial);
55 static void option_rx_throttle(struct usb_serial_port *port);
56 static void option_rx_unthrottle(struct usb_serial_port *port);
57 static int option_write_room(struct usb_serial_port *port);
58
59 static void option_instat_callback(struct urb *urb, struct pt_regs *regs);
60
61 static int option_write(struct usb_serial_port *port,
62 const unsigned char *buf, int count);
63
64 static int option_chars_in_buffer(struct usb_serial_port *port);
65 static int option_ioctl(struct usb_serial_port *port, struct file *file,
66 unsigned int cmd, unsigned long arg);
67 static void option_set_termios(struct usb_serial_port *port,
68 struct termios *old);
69 static void option_break_ctl(struct usb_serial_port *port, int break_state);
70 static int option_tiocmget(struct usb_serial_port *port, struct file *file);
71 static int option_tiocmset(struct usb_serial_port *port, struct file *file,
72 unsigned int set, unsigned int clear);
73 static int option_send_setup(struct usb_serial_port *port);
74
75 /* Vendor and product IDs */
76 #define OPTION_VENDOR_ID 0x0AF0
77 #define HUAWEI_VENDOR_ID 0x12D1
78 #define AUDIOVOX_VENDOR_ID 0x0F3D
79
80 #define OPTION_PRODUCT_OLD 0x5000
81 #define OPTION_PRODUCT_FUSION 0x6000
82 #define OPTION_PRODUCT_FUSION2 0x6300
83 #define HUAWEI_PRODUCT_E600 0x1001
84 #define AUDIOVOX_PRODUCT_AIRCARD 0x0112
85
86 static struct usb_device_id option_ids[] = {
87 { USB_DEVICE(OPTION_VENDOR_ID, OPTION_PRODUCT_OLD) },
88 { USB_DEVICE(OPTION_VENDOR_ID, OPTION_PRODUCT_FUSION) },
89 { USB_DEVICE(OPTION_VENDOR_ID, OPTION_PRODUCT_FUSION2) },
90 { USB_DEVICE(HUAWEI_VENDOR_ID, HUAWEI_PRODUCT_E600) },
91 { USB_DEVICE(AUDIOVOX_VENDOR_ID, AUDIOVOX_PRODUCT_AIRCARD) },
92 { } /* Terminating entry */
93 };
94
95 MODULE_DEVICE_TABLE(usb, option_ids);
96
97 static struct usb_driver option_driver = {
98 .owner = THIS_MODULE,
99 .name = "option",
100 .probe = usb_serial_probe,
101 .disconnect = usb_serial_disconnect,
102 .id_table = option_ids,
103 };
104
105 /* The card has three separate interfaces, wich the serial driver
106 * recognizes separately, thus num_port=1.
107 */
108 static struct usb_serial_driver option_3port_device = {
109 .driver = {
110 .owner = THIS_MODULE,
111 .name = "option",
112 },
113 .description = "Option 3G data card",
114 .id_table = option_ids,
115 .num_interrupt_in = NUM_DONT_CARE,
116 .num_bulk_in = NUM_DONT_CARE,
117 .num_bulk_out = NUM_DONT_CARE,
118 .num_ports = 1, /* 3, but the card reports its ports separately */
119 .open = option_open,
120 .close = option_close,
121 .write = option_write,
122 .write_room = option_write_room,
123 .chars_in_buffer = option_chars_in_buffer,
124 .throttle = option_rx_throttle,
125 .unthrottle = option_rx_unthrottle,
126 .ioctl = option_ioctl,
127 .set_termios = option_set_termios,
128 .break_ctl = option_break_ctl,
129 .tiocmget = option_tiocmget,
130 .tiocmset = option_tiocmset,
131 .attach = option_startup,
132 .shutdown = option_shutdown,
133 .read_int_callback = option_instat_callback,
134 };
135
136 #ifdef CONFIG_USB_DEBUG
137 static int debug;
138 #else
139 #define debug 0
140 #endif
141
142 /* per port private data */
143
144 #define N_IN_URB 4
145 #define N_OUT_URB 1
146 #define IN_BUFLEN 4096
147 #define OUT_BUFLEN 128
148
149 struct option_port_private {
150 /* Input endpoints and buffer for this port */
151 struct urb *in_urbs[N_IN_URB];
152 char in_buffer[N_IN_URB][IN_BUFLEN];
153 /* Output endpoints and buffer for this port */
154 struct urb *out_urbs[N_OUT_URB];
155 char out_buffer[N_OUT_URB][OUT_BUFLEN];
156
157 /* Settings for the port */
158 int rts_state; /* Handshaking pins (outputs) */
159 int dtr_state;
160 int cts_state; /* Handshaking pins (inputs) */
161 int dsr_state;
162 int dcd_state;
163 int ri_state;
164
165 unsigned long tx_start_time[N_OUT_URB];
166 };
167
168 /* Functions used by new usb-serial code. */
169 static int __init option_init(void)
170 {
171 int retval;
172 retval = usb_serial_register(&option_3port_device);
173 if (retval)
174 goto failed_3port_device_register;
175 retval = usb_register(&option_driver);
176 if (retval)
177 goto failed_driver_register;
178
179 info(DRIVER_DESC ": " DRIVER_VERSION);
180
181 return 0;
182
183 failed_driver_register:
184 usb_serial_deregister (&option_3port_device);
185 failed_3port_device_register:
186 return retval;
187 }
188
189 static void __exit option_exit(void)
190 {
191 usb_deregister (&option_driver);
192 usb_serial_deregister (&option_3port_device);
193 }
194
195 module_init(option_init);
196 module_exit(option_exit);
197
198 static void option_rx_throttle(struct usb_serial_port *port)
199 {
200 dbg("%s", __FUNCTION__);
201 }
202
203 static void option_rx_unthrottle(struct usb_serial_port *port)
204 {
205 dbg("%s", __FUNCTION__);
206 }
207
208 static void option_break_ctl(struct usb_serial_port *port, int break_state)
209 {
210 /* Unfortunately, I don't know how to send a break */
211 dbg("%s", __FUNCTION__);
212 }
213
214 static void option_set_termios(struct usb_serial_port *port,
215 struct termios *old_termios)
216 {
217 dbg("%s", __FUNCTION__);
218
219 option_send_setup(port);
220 }
221
222 static int option_tiocmget(struct usb_serial_port *port, struct file *file)
223 {
224 unsigned int value;
225 struct option_port_private *portdata;
226
227 portdata = usb_get_serial_port_data(port);
228
229 value = ((portdata->rts_state) ? TIOCM_RTS : 0) |
230 ((portdata->dtr_state) ? TIOCM_DTR : 0) |
231 ((portdata->cts_state) ? TIOCM_CTS : 0) |
232 ((portdata->dsr_state) ? TIOCM_DSR : 0) |
233 ((portdata->dcd_state) ? TIOCM_CAR : 0) |
234 ((portdata->ri_state) ? TIOCM_RNG : 0);
235
236 return value;
237 }
238
239 static int option_tiocmset(struct usb_serial_port *port, struct file *file,
240 unsigned int set, unsigned int clear)
241 {
242 struct option_port_private *portdata;
243
244 portdata = usb_get_serial_port_data(port);
245
246 if (set & TIOCM_RTS)
247 portdata->rts_state = 1;
248 if (set & TIOCM_DTR)
249 portdata->dtr_state = 1;
250
251 if (clear & TIOCM_RTS)
252 portdata->rts_state = 0;
253 if (clear & TIOCM_DTR)
254 portdata->dtr_state = 0;
255 return option_send_setup(port);
256 }
257
258 static int option_ioctl(struct usb_serial_port *port, struct file *file,
259 unsigned int cmd, unsigned long arg)
260 {
261 return -ENOIOCTLCMD;
262 }
263
264 /* Write */
265 static int option_write(struct usb_serial_port *port,
266 const unsigned char *buf, int count)
267 {
268 struct option_port_private *portdata;
269 int i;
270 int left, todo;
271 struct urb *this_urb = NULL; /* spurious */
272 int err;
273
274 portdata = usb_get_serial_port_data(port);
275
276 dbg("%s: write (%d chars)", __FUNCTION__, count);
277
278 i = 0;
279 left = count;
280 for (i=0; left > 0 && i < N_OUT_URB; i++) {
281 todo = left;
282 if (todo > OUT_BUFLEN)
283 todo = OUT_BUFLEN;
284
285 this_urb = portdata->out_urbs[i];
286 if (this_urb->status == -EINPROGRESS) {
287 if (time_before(jiffies,
288 portdata->tx_start_time[i] + 10 * HZ))
289 continue;
290 usb_unlink_urb(this_urb);
291 continue;
292 }
293 if (this_urb->status != 0)
294 dbg("usb_write %p failed (err=%d)",
295 this_urb, this_urb->status);
296
297 dbg("%s: endpoint %d buf %d", __FUNCTION__,
298 usb_pipeendpoint(this_urb->pipe), i);
299
300 /* send the data */
301 memcpy (this_urb->transfer_buffer, buf, todo);
302 this_urb->transfer_buffer_length = todo;
303
304 this_urb->dev = port->serial->dev;
305 err = usb_submit_urb(this_urb, GFP_ATOMIC);
306 if (err) {
307 dbg("usb_submit_urb %p (write bulk) failed "
308 "(%d, has %d)", this_urb,
309 err, this_urb->status);
310 continue;
311 }
312 portdata->tx_start_time[i] = jiffies;
313 buf += todo;
314 left -= todo;
315 }
316
317 count -= left;
318 dbg("%s: wrote (did %d)", __FUNCTION__, count);
319 return count;
320 }
321
322 static void option_indat_callback(struct urb *urb, struct pt_regs *regs)
323 {
324 int i, err;
325 int endpoint;
326 struct usb_serial_port *port;
327 struct tty_struct *tty;
328 unsigned char *data = urb->transfer_buffer;
329
330 dbg("%s: %p", __FUNCTION__, urb);
331
332 endpoint = usb_pipeendpoint(urb->pipe);
333 port = (struct usb_serial_port *) urb->context;
334
335 if (urb->status) {
336 dbg("%s: nonzero status: %d on endpoint %02x.",
337 __FUNCTION__, urb->status, endpoint);
338 } else {
339 tty = port->tty;
340 if (urb->actual_length) {
341 for (i = 0; i < urb->actual_length ; ++i) {
342 if (tty->flip.count >= TTY_FLIPBUF_SIZE)
343 tty_flip_buffer_push(tty);
344 tty_insert_flip_char(tty, data[i], 0);
345 }
346 tty_flip_buffer_push(tty);
347 } else {
348 dbg("%s: empty read urb received", __FUNCTION__);
349 }
350
351 /* Resubmit urb so we continue receiving */
352 if (port->open_count && urb->status != -ESHUTDOWN) {
353 err = usb_submit_urb(urb, GFP_ATOMIC);
354 if (err)
355 printk(KERN_ERR "%s: resubmit read urb failed. "
356 "(%d)", __FUNCTION__, err);
357 }
358 }
359 return;
360 }
361
362 static void option_outdat_callback(struct urb *urb, struct pt_regs *regs)
363 {
364 struct usb_serial_port *port;
365
366 dbg("%s", __FUNCTION__);
367
368 port = (struct usb_serial_port *) urb->context;
369
370 if (port->open_count)
371 schedule_work(&port->work);
372 }
373
374 static void option_instat_callback(struct urb *urb, struct pt_regs *regs)
375 {
376 int err;
377 struct usb_serial_port *port = (struct usb_serial_port *) urb->context;
378 struct option_port_private *portdata = usb_get_serial_port_data(port);
379 struct usb_serial *serial = port->serial;
380
381 dbg("%s", __FUNCTION__);
382 dbg("%s: urb %p port %p has data %p", __FUNCTION__,urb,port,portdata);
383
384 if (urb->status == 0) {
385 struct usb_ctrlrequest *req_pkt =
386 (struct usb_ctrlrequest *)urb->transfer_buffer;
387
388 if (!req_pkt) {
389 dbg("%s: NULL req_pkt\n", __FUNCTION__);
390 return;
391 }
392 if ((req_pkt->bRequestType == 0xA1) &&
393 (req_pkt->bRequest == 0x20)) {
394 int old_dcd_state;
395 unsigned char signals = *((unsigned char *)
396 urb->transfer_buffer +
397 sizeof(struct usb_ctrlrequest));
398
399 dbg("%s: signal x%x", __FUNCTION__, signals);
400
401 old_dcd_state = portdata->dcd_state;
402 portdata->cts_state = 1;
403 portdata->dcd_state = ((signals & 0x01) ? 1 : 0);
404 portdata->dsr_state = ((signals & 0x02) ? 1 : 0);
405 portdata->ri_state = ((signals & 0x08) ? 1 : 0);
406
407 if (port->tty && !C_CLOCAL(port->tty) &&
408 old_dcd_state && !portdata->dcd_state)
409 tty_hangup(port->tty);
410 } else {
411 dbg("%s: type %x req %x", __FUNCTION__,
412 req_pkt->bRequestType,req_pkt->bRequest);
413 }
414 } else
415 dbg("%s: error %d", __FUNCTION__, urb->status);
416
417 /* Resubmit urb so we continue receiving IRQ data */
418 if (urb->status != -ESHUTDOWN) {
419 urb->dev = serial->dev;
420 err = usb_submit_urb(urb, GFP_ATOMIC);
421 if (err)
422 dbg("%s: resubmit intr urb failed. (%d)",
423 __FUNCTION__, err);
424 }
425 }
426
427 static int option_write_room(struct usb_serial_port *port)
428 {
429 struct option_port_private *portdata;
430 int i;
431 int data_len = 0;
432 struct urb *this_urb;
433
434 portdata = usb_get_serial_port_data(port);
435
436 for (i=0; i < N_OUT_URB; i++) {
437 this_urb = portdata->out_urbs[i];
438 if (this_urb && this_urb->status != -EINPROGRESS)
439 data_len += OUT_BUFLEN;
440 }
441
442 dbg("%s: %d", __FUNCTION__, data_len);
443 return data_len;
444 }
445
446 static int option_chars_in_buffer(struct usb_serial_port *port)
447 {
448 struct option_port_private *portdata;
449 int i;
450 int data_len = 0;
451 struct urb *this_urb;
452
453 portdata = usb_get_serial_port_data(port);
454
455 for (i=0; i < N_OUT_URB; i++) {
456 this_urb = portdata->out_urbs[i];
457 if (this_urb && this_urb->status == -EINPROGRESS)
458 data_len += this_urb->transfer_buffer_length;
459 }
460 dbg("%s: %d", __FUNCTION__, data_len);
461 return data_len;
462 }
463
464 static int option_open(struct usb_serial_port *port, struct file *filp)
465 {
466 struct option_port_private *portdata;
467 struct usb_serial *serial = port->serial;
468 int i, err;
469 struct urb *urb;
470
471 portdata = usb_get_serial_port_data(port);
472
473 dbg("%s", __FUNCTION__);
474
475 /* Set some sane defaults */
476 portdata->rts_state = 1;
477 portdata->dtr_state = 1;
478
479 /* Reset low level data toggle and start reading from endpoints */
480 for (i = 0; i < N_IN_URB; i++) {
481 urb = portdata->in_urbs[i];
482 if (! urb)
483 continue;
484 if (urb->dev != serial->dev) {
485 dbg("%s: dev %p != %p", __FUNCTION__,
486 urb->dev, serial->dev);
487 continue;
488 }
489
490 /*
491 * make sure endpoint data toggle is synchronized with the
492 * device
493 */
494 usb_clear_halt(urb->dev, urb->pipe);
495
496 err = usb_submit_urb(urb, GFP_KERNEL);
497 if (err) {
498 dbg("%s: submit urb %d failed (%d) %d",
499 __FUNCTION__, i, err,
500 urb->transfer_buffer_length);
501 }
502 }
503
504 /* Reset low level data toggle on out endpoints */
505 for (i = 0; i < N_OUT_URB; i++) {
506 urb = portdata->out_urbs[i];
507 if (! urb)
508 continue;
509 urb->dev = serial->dev;
510 /* usb_settoggle(urb->dev, usb_pipeendpoint(urb->pipe),
511 usb_pipeout(urb->pipe), 0); */
512 }
513
514 port->tty->low_latency = 1;
515
516 option_send_setup(port);
517
518 return (0);
519 }
520
521 static inline void stop_urb(struct urb *urb)
522 {
523 if (urb && urb->status == -EINPROGRESS)
524 usb_kill_urb(urb);
525 }
526
527 static void option_close(struct usb_serial_port *port, struct file *filp)
528 {
529 int i;
530 struct usb_serial *serial = port->serial;
531 struct option_port_private *portdata;
532
533 dbg("%s", __FUNCTION__);
534 portdata = usb_get_serial_port_data(port);
535
536 portdata->rts_state = 0;
537 portdata->dtr_state = 0;
538
539 if (serial->dev) {
540 option_send_setup(port);
541
542 /* Stop reading/writing urbs */
543 for (i = 0; i < N_IN_URB; i++)
544 stop_urb(portdata->in_urbs[i]);
545 for (i = 0; i < N_OUT_URB; i++)
546 stop_urb(portdata->out_urbs[i]);
547 }
548 port->tty = NULL;
549 }
550
551 /* Helper functions used by option_setup_urbs */
552 static struct urb *option_setup_urb(struct usb_serial *serial, int endpoint,
553 int dir, void *ctx, char *buf, int len,
554 void (*callback)(struct urb *, struct pt_regs *regs))
555 {
556 struct urb *urb;
557
558 if (endpoint == -1)
559 return NULL; /* endpoint not needed */
560
561 urb = usb_alloc_urb(0, GFP_KERNEL); /* No ISO */
562 if (urb == NULL) {
563 dbg("%s: alloc for endpoint %d failed.", __FUNCTION__, endpoint);
564 return NULL;
565 }
566
567 /* Fill URB using supplied data. */
568 usb_fill_bulk_urb(urb, serial->dev,
569 usb_sndbulkpipe(serial->dev, endpoint) | dir,
570 buf, len, callback, ctx);
571
572 return urb;
573 }
574
575 /* Setup urbs */
576 static void option_setup_urbs(struct usb_serial *serial)
577 {
578 int j;
579 struct usb_serial_port *port;
580 struct option_port_private *portdata;
581
582 dbg("%s", __FUNCTION__);
583
584 port = serial->port[0];
585 portdata = usb_get_serial_port_data(port);
586
587 /* Do indat endpoints first */
588 for (j = 0; j <= N_IN_URB; ++j) {
589 portdata->in_urbs[j] = option_setup_urb (serial,
590 port->bulk_in_endpointAddress, USB_DIR_IN, port,
591 portdata->in_buffer[j], IN_BUFLEN, option_indat_callback);
592 }
593
594 /* outdat endpoints */
595 for (j = 0; j <= N_OUT_URB; ++j) {
596 portdata->out_urbs[j] = option_setup_urb (serial,
597 port->bulk_out_endpointAddress, USB_DIR_OUT, port,
598 portdata->out_buffer[j], OUT_BUFLEN, option_outdat_callback);
599 }
600 }
601
602 static int option_send_setup(struct usb_serial_port *port)
603 {
604 struct usb_serial *serial = port->serial;
605 struct option_port_private *portdata;
606
607 dbg("%s", __FUNCTION__);
608
609 portdata = usb_get_serial_port_data(port);
610
611 if (port->tty) {
612 int val = 0;
613 if (portdata->dtr_state)
614 val |= 0x01;
615 if (portdata->rts_state)
616 val |= 0x02;
617
618 return usb_control_msg(serial->dev,
619 usb_rcvctrlpipe(serial->dev, 0),
620 0x22,0x21,val,0,NULL,0,USB_CTRL_SET_TIMEOUT);
621 }
622
623 return 0;
624 }
625
626 static int option_startup(struct usb_serial *serial)
627 {
628 int i, err;
629 struct usb_serial_port *port;
630 struct option_port_private *portdata;
631
632 dbg("%s", __FUNCTION__);
633
634 /* Now setup per port private data */
635 for (i = 0; i < serial->num_ports; i++) {
636 port = serial->port[i];
637 portdata = kmalloc(sizeof(*portdata), GFP_KERNEL);
638 if (!portdata) {
639 dbg("%s: kmalloc for option_port_private (%d) failed!.",
640 __FUNCTION__, i);
641 return (1);
642 }
643 memset(portdata, 0, sizeof(struct option_port_private));
644
645 usb_set_serial_port_data(port, portdata);
646
647 if (! port->interrupt_in_urb)
648 continue;
649 err = usb_submit_urb(port->interrupt_in_urb, GFP_KERNEL);
650 if (err)
651 dbg("%s: submit irq_in urb failed %d",
652 __FUNCTION__, err);
653 }
654
655 option_setup_urbs(serial);
656
657 return (0);
658 }
659
660 static void option_shutdown(struct usb_serial *serial)
661 {
662 int i, j;
663 struct usb_serial_port *port;
664 struct option_port_private *portdata;
665
666 dbg("%s", __FUNCTION__);
667
668 /* Stop reading/writing urbs */
669 for (i = 0; i < serial->num_ports; ++i) {
670 port = serial->port[i];
671 portdata = usb_get_serial_port_data(port);
672 for (j = 0; j < N_IN_URB; j++)
673 stop_urb(portdata->in_urbs[j]);
674 for (j = 0; j < N_OUT_URB; j++)
675 stop_urb(portdata->out_urbs[j]);
676 }
677
678 /* Now free them */
679 for (i = 0; i < serial->num_ports; ++i) {
680 port = serial->port[i];
681 portdata = usb_get_serial_port_data(port);
682
683 for (j = 0; j < N_IN_URB; j++) {
684 if (portdata->in_urbs[j]) {
685 usb_free_urb(portdata->in_urbs[j]);
686 portdata->in_urbs[j] = NULL;
687 }
688 }
689 for (j = 0; j < N_OUT_URB; j++) {
690 if (portdata->out_urbs[j]) {
691 usb_free_urb(portdata->out_urbs[j]);
692 portdata->out_urbs[j] = NULL;
693 }
694 }
695 }
696
697 /* Now free per port private data */
698 for (i = 0; i < serial->num_ports; i++) {
699 port = serial->port[i];
700 kfree(usb_get_serial_port_data(port));
701 }
702 }
703
704 MODULE_AUTHOR(DRIVER_AUTHOR);
705 MODULE_DESCRIPTION(DRIVER_DESC);
706 MODULE_VERSION(DRIVER_VERSION);
707 MODULE_LICENSE("GPL");
708
709 #ifdef CONFIG_USB_DEBUG
710 module_param(debug, bool, S_IRUGO | S_IWUSR);
711 MODULE_PARM_DESC(debug, "Debug messages");
712 #endif
713
linux v2.6.22.y-op