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[TG3]: Set minimal hw interrupt mitigation.
[linux-2.6/verdex.git] / drivers / usb / serial / belkin_sa.c
blobabb1b2c543bbe11a7509857599024c8c7fdc3b6a
1 /*
2 * Belkin USB Serial Adapter Driver
3 *
4 * Copyright (C) 2000 William Greathouse (wgreathouse@smva.com)
5 * Copyright (C) 2000-2001 Greg Kroah-Hartman (greg@kroah.com)
6 *
7 * This program is largely derived from work by the linux-usb group
8 * and associated source files. Please see the usb/serial files for
9 * individual credits and copyrights.
10 *
11 * This program is free software; you can redistribute it and/or modify
12 * it under the terms of the GNU General Public License as published by
13 * the Free Software Foundation; either version 2 of the License, or
14 * (at your option) any later version.
15 *
16 * See Documentation/usb/usb-serial.txt for more information on using this driver
17 *
18 * TODO:
19 * -- Add true modem contol line query capability. Currently we track the
20 * states reported by the interrupt and the states we request.
21 * -- Add error reporting back to application for UART error conditions.
22 * Just point me at how to implement this and I'll do it. I've put the
23 * framework in, but haven't analyzed the "tty_flip" interface yet.
24 * -- Add support for flush commands
25 * -- Add everything that is missing :)
26 *
27 * 27-Nov-2001 gkh
28 * compressed all the differnent device entries into 1.
29 *
30 * 30-May-2001 gkh
31 * switched from using spinlock to a semaphore, which fixes lots of problems.
32 *
33 * 08-Apr-2001 gb
34 * - Identify version on module load.
35 *
36 * 12-Mar-2001 gkh
37 * - Added support for the GoHubs GO-COM232 device which is the same as the
38 * Peracom device.
39 *
40 * 06-Nov-2000 gkh
41 * - Added support for the old Belkin and Peracom devices.
42 * - Made the port able to be opened multiple times.
43 * - Added some defaults incase the line settings are things these devices
44 * can't support.
45 *
46 * 18-Oct-2000 William Greathouse
47 * Released into the wild (linux-usb-devel)
48 *
49 * 17-Oct-2000 William Greathouse
50 * Add code to recognize firmware version and set hardware flow control
51 * appropriately. Belkin states that firmware prior to 3.05 does not
52 * operate correctly in hardware handshake mode. I have verified this
53 * on firmware 2.05 -- for both RTS and DTR input flow control, the control
54 * line is not reset. The test performed by the Belkin Win* driver is
55 * to enable hardware flow control for firmware 2.06 or greater and
56 * for 1.00 or prior. I am only enabling for 2.06 or greater.
57 *
58 * 12-Oct-2000 William Greathouse
59 * First cut at supporting Belkin USB Serial Adapter F5U103
60 * I did not have a copy of the original work to support this
61 * adapter, so pardon any stupid mistakes. All of the information
62 * I am using to write this driver was acquired by using a modified
63 * UsbSnoop on Windows2000 and from examining the other USB drivers.
64 */
65
66 #include <linux/config.h>
67 #include <linux/kernel.h>
68 #include <linux/errno.h>
69 #include <linux/init.h>
70 #include <linux/slab.h>
71 #include <linux/tty.h>
72 #include <linux/tty_driver.h>
73 #include <linux/tty_flip.h>
74 #include <linux/module.h>
75 #include <linux/spinlock.h>
76 #include <asm/uaccess.h>
77 #include <linux/usb.h>
78 #include "usb-serial.h"
79 #include "belkin_sa.h"
80
81 static int debug;
82
83 /*
84 * Version Information
85 */
86 #define DRIVER_VERSION "v1.2"
87 #define DRIVER_AUTHOR "William Greathouse <wgreathouse@smva.com>"
88 #define DRIVER_DESC "USB Belkin Serial converter driver"
89
90 /* function prototypes for a Belkin USB Serial Adapter F5U103 */
91 static int belkin_sa_startup (struct usb_serial *serial);
92 static void belkin_sa_shutdown (struct usb_serial *serial);
93 static int belkin_sa_open (struct usb_serial_port *port, struct file *filp);
94 static void belkin_sa_close (struct usb_serial_port *port, struct file *filp);
95 static void belkin_sa_read_int_callback (struct urb *urb, struct pt_regs *regs);
96 static void belkin_sa_set_termios (struct usb_serial_port *port, struct termios * old);
97 static int belkin_sa_ioctl (struct usb_serial_port *port, struct file * file, unsigned int cmd, unsigned long arg);
98 static void belkin_sa_break_ctl (struct usb_serial_port *port, int break_state );
99 static int belkin_sa_tiocmget (struct usb_serial_port *port, struct file *file);
100 static int belkin_sa_tiocmset (struct usb_serial_port *port, struct file *file, unsigned int set, unsigned int clear);
101
102
103 static struct usb_device_id id_table_combined [] = {
104 { USB_DEVICE(BELKIN_SA_VID, BELKIN_SA_PID) },
105 { USB_DEVICE(BELKIN_OLD_VID, BELKIN_OLD_PID) },
106 { USB_DEVICE(PERACOM_VID, PERACOM_PID) },
107 { USB_DEVICE(GOHUBS_VID, GOHUBS_PID) },
108 { USB_DEVICE(GOHUBS_VID, HANDYLINK_PID) },
109 { USB_DEVICE(BELKIN_DOCKSTATION_VID, BELKIN_DOCKSTATION_PID) },
110 { } /* Terminating entry */
111 };
112
113 MODULE_DEVICE_TABLE (usb, id_table_combined);
114
115 static struct usb_driver belkin_driver = {
116 .owner = THIS_MODULE,
117 .name = "belkin",
118 .probe = usb_serial_probe,
119 .disconnect = usb_serial_disconnect,
120 .id_table = id_table_combined,
121 };
122
123 /* All of the device info needed for the serial converters */
124 static struct usb_serial_device_type belkin_device = {
125 .owner = THIS_MODULE,
126 .name = "Belkin / Peracom / GoHubs USB Serial Adapter",
127 .short_name = "belkin",
128 .id_table = id_table_combined,
129 .num_interrupt_in = 1,
130 .num_bulk_in = 1,
131 .num_bulk_out = 1,
132 .num_ports = 1,
133 .open = belkin_sa_open,
134 .close = belkin_sa_close,
135 .read_int_callback = belkin_sa_read_int_callback, /* How we get the status info */
136 .ioctl = belkin_sa_ioctl,
137 .set_termios = belkin_sa_set_termios,
138 .break_ctl = belkin_sa_break_ctl,
139 .tiocmget = belkin_sa_tiocmget,
140 .tiocmset = belkin_sa_tiocmset,
141 .attach = belkin_sa_startup,
142 .shutdown = belkin_sa_shutdown,
143 };
144
145
146 struct belkin_sa_private {
147 spinlock_t lock;
148 unsigned long control_state;
149 unsigned char last_lsr;
150 unsigned char last_msr;
151 int bad_flow_control;
152 };
153
154
155 /*
156 * ***************************************************************************
157 * Belkin USB Serial Adapter F5U103 specific driver functions
158 * ***************************************************************************
159 */
160
161 #define WDR_TIMEOUT 5000 /* default urb timeout */
162
163 /* assumes that struct usb_serial *serial is available */
164 #define BSA_USB_CMD(c,v) usb_control_msg(serial->dev, usb_sndctrlpipe(serial->dev, 0), \
165 (c), BELKIN_SA_SET_REQUEST_TYPE, \
166 (v), 0, NULL, 0, WDR_TIMEOUT)
167
168 /* do some startup allocations not currently performed by usb_serial_probe() */
169 static int belkin_sa_startup (struct usb_serial *serial)
170 {
171 struct usb_device *dev = serial->dev;
172 struct belkin_sa_private *priv;
173
174 /* allocate the private data structure */
175 priv = kmalloc(sizeof(struct belkin_sa_private), GFP_KERNEL);
176 if (!priv)
177 return (-1); /* error */
178 /* set initial values for control structures */
179 spin_lock_init(&priv->lock);
180 priv->control_state = 0;
181 priv->last_lsr = 0;
182 priv->last_msr = 0;
183 /* see comments at top of file */
184 priv->bad_flow_control = (le16_to_cpu(dev->descriptor.bcdDevice) <= 0x0206) ? 1 : 0;
185 info("bcdDevice: %04x, bfc: %d", le16_to_cpu(dev->descriptor.bcdDevice), priv->bad_flow_control);
186
187 init_waitqueue_head(&serial->port[0]->write_wait);
188 usb_set_serial_port_data(serial->port[0], priv);
189
190 return (0);
191 }
192
193
194 static void belkin_sa_shutdown (struct usb_serial *serial)
195 {
196 struct belkin_sa_private *priv;
197 int i;
198
199 dbg ("%s", __FUNCTION__);
200
201 /* stop reads and writes on all ports */
202 for (i=0; i < serial->num_ports; ++i) {
203 /* My special items, the standard routines free my urbs */
204 priv = usb_get_serial_port_data(serial->port[i]);
205 kfree(priv);
206 }
207 }
208
209
210 static int belkin_sa_open (struct usb_serial_port *port, struct file *filp)
211 {
212 int retval = 0;
213
214 dbg("%s port %d", __FUNCTION__, port->number);
215
216 /*Start reading from the device*/
217 /* TODO: Look at possibility of submitting multiple URBs to device to
218 * enhance buffering. Win trace shows 16 initial read URBs.
219 */
220 port->read_urb->dev = port->serial->dev;
221 retval = usb_submit_urb(port->read_urb, GFP_KERNEL);
222 if (retval) {
223 err("usb_submit_urb(read bulk) failed");
224 goto exit;
225 }
226
227 port->interrupt_in_urb->dev = port->serial->dev;
228 retval = usb_submit_urb(port->interrupt_in_urb, GFP_KERNEL);
229 if (retval) {
230 usb_kill_urb(port->read_urb);
231 err(" usb_submit_urb(read int) failed");
232 }
233
234 exit:
235 return retval;
236 } /* belkin_sa_open */
237
238
239 static void belkin_sa_close (struct usb_serial_port *port, struct file *filp)
240 {
241 dbg("%s port %d", __FUNCTION__, port->number);
242
243 /* shutdown our bulk reads and writes */
244 usb_kill_urb(port->write_urb);
245 usb_kill_urb(port->read_urb);
246 usb_kill_urb(port->interrupt_in_urb);
247 } /* belkin_sa_close */
248
249
250 static void belkin_sa_read_int_callback (struct urb *urb, struct pt_regs *regs)
251 {
252 struct usb_serial_port *port = (struct usb_serial_port *)urb->context;
253 struct belkin_sa_private *priv;
254 unsigned char *data = urb->transfer_buffer;
255 int retval;
256 unsigned long flags;
257
258 switch (urb->status) {
259 case 0:
260 /* success */
261 break;
262 case -ECONNRESET:
263 case -ENOENT:
264 case -ESHUTDOWN:
265 /* this urb is terminated, clean up */
266 dbg("%s - urb shutting down with status: %d", __FUNCTION__, urb->status);
267 return;
268 default:
269 dbg("%s - nonzero urb status received: %d", __FUNCTION__, urb->status);
270 goto exit;
271 }
272
273 usb_serial_debug_data(debug, &port->dev, __FUNCTION__, urb->actual_length, data);
274
275 /* Handle known interrupt data */
276 /* ignore data[0] and data[1] */
277
278 priv = usb_get_serial_port_data(port);
279 spin_lock_irqsave(&priv->lock, flags);
280 priv->last_msr = data[BELKIN_SA_MSR_INDEX];
281
282 /* Record Control Line states */
283 if (priv->last_msr & BELKIN_SA_MSR_DSR)
284 priv->control_state |= TIOCM_DSR;
285 else
286 priv->control_state &= ~TIOCM_DSR;
287
288 if (priv->last_msr & BELKIN_SA_MSR_CTS)
289 priv->control_state |= TIOCM_CTS;
290 else
291 priv->control_state &= ~TIOCM_CTS;
292
293 if (priv->last_msr & BELKIN_SA_MSR_RI)
294 priv->control_state |= TIOCM_RI;
295 else
296 priv->control_state &= ~TIOCM_RI;
297
298 if (priv->last_msr & BELKIN_SA_MSR_CD)
299 priv->control_state |= TIOCM_CD;
300 else
301 priv->control_state &= ~TIOCM_CD;
302
303 /* Now to report any errors */
304 priv->last_lsr = data[BELKIN_SA_LSR_INDEX];
305 #if 0
306 /*
307 * fill in the flip buffer here, but I do not know the relation
308 * to the current/next receive buffer or characters. I need
309 * to look in to this before committing any code.
310 */
311 if (priv->last_lsr & BELKIN_SA_LSR_ERR) {
312 tty = port->tty;
313 /* Overrun Error */
314 if (priv->last_lsr & BELKIN_SA_LSR_OE) {
315 }
316 /* Parity Error */
317 if (priv->last_lsr & BELKIN_SA_LSR_PE) {
318 }
319 /* Framing Error */
320 if (priv->last_lsr & BELKIN_SA_LSR_FE) {
321 }
322 /* Break Indicator */
323 if (priv->last_lsr & BELKIN_SA_LSR_BI) {
324 }
325 }
326 #endif
327 spin_unlock_irqrestore(&priv->lock, flags);
328 exit:
329 retval = usb_submit_urb (urb, GFP_ATOMIC);
330 if (retval)
331 err ("%s - usb_submit_urb failed with result %d",
332 __FUNCTION__, retval);
333 }
334
335 static void belkin_sa_set_termios (struct usb_serial_port *port, struct termios *old_termios)
336 {
337 struct usb_serial *serial = port->serial;
338 struct belkin_sa_private *priv = usb_get_serial_port_data(port);
339 unsigned int iflag;
340 unsigned int cflag;
341 unsigned int old_iflag = 0;
342 unsigned int old_cflag = 0;
343 __u16 urb_value = 0; /* Will hold the new flags */
344 unsigned long flags;
345 unsigned long control_state;
346 int bad_flow_control;
347
348 if ((!port->tty) || (!port->tty->termios)) {
349 dbg ("%s - no tty or termios structure", __FUNCTION__);
350 return;
351 }
352
353 iflag = port->tty->termios->c_iflag;
354 cflag = port->tty->termios->c_cflag;
355
356 /* get a local copy of the current port settings */
357 spin_lock_irqsave(&priv->lock, flags);
358 control_state = priv->control_state;
359 bad_flow_control = priv->bad_flow_control;
360 spin_unlock_irqrestore(&priv->lock, flags);
361
362 /* check that they really want us to change something */
363 if (old_termios) {
364 if ((cflag == old_termios->c_cflag) &&
365 (RELEVANT_IFLAG(port->tty->termios->c_iflag) == RELEVANT_IFLAG(old_termios->c_iflag))) {
366 dbg("%s - nothing to change...", __FUNCTION__);
367 return;
368 }
369 old_iflag = old_termios->c_iflag;
370 old_cflag = old_termios->c_cflag;
371 }
372
373 /* Set the baud rate */
374 if( (cflag&CBAUD) != (old_cflag&CBAUD) ) {
375 /* reassert DTR and (maybe) RTS on transition from B0 */
376 if( (old_cflag&CBAUD) == B0 ) {
377 control_state |= (TIOCM_DTR|TIOCM_RTS);
378 if (BSA_USB_CMD(BELKIN_SA_SET_DTR_REQUEST, 1) < 0)
379 err("Set DTR error");
380 /* don't set RTS if using hardware flow control */
381 if (!(old_cflag&CRTSCTS) )
382 if (BSA_USB_CMD(BELKIN_SA_SET_RTS_REQUEST, 1) < 0)
383 err("Set RTS error");
384 }
385
386 switch(cflag & CBAUD) {
387 case B0: /* handled below */ break;
388 case B300: urb_value = BELKIN_SA_BAUD(300); break;
389 case B600: urb_value = BELKIN_SA_BAUD(600); break;
390 case B1200: urb_value = BELKIN_SA_BAUD(1200); break;
391 case B2400: urb_value = BELKIN_SA_BAUD(2400); break;
392 case B4800: urb_value = BELKIN_SA_BAUD(4800); break;
393 case B9600: urb_value = BELKIN_SA_BAUD(9600); break;
394 case B19200: urb_value = BELKIN_SA_BAUD(19200); break;
395 case B38400: urb_value = BELKIN_SA_BAUD(38400); break;
396 case B57600: urb_value = BELKIN_SA_BAUD(57600); break;
397 case B115200: urb_value = BELKIN_SA_BAUD(115200); break;
398 case B230400: urb_value = BELKIN_SA_BAUD(230400); break;
399 default: err("BELKIN USB Serial Adapter: unsupported baudrate request, using default of 9600");
400 urb_value = BELKIN_SA_BAUD(9600); break;
401 }
402 if ((cflag & CBAUD) != B0 ) {
403 if (BSA_USB_CMD(BELKIN_SA_SET_BAUDRATE_REQUEST, urb_value) < 0)
404 err("Set baudrate error");
405 } else {
406 /* Disable flow control */
407 if (BSA_USB_CMD(BELKIN_SA_SET_FLOW_CTRL_REQUEST, BELKIN_SA_FLOW_NONE) < 0)
408 err("Disable flowcontrol error");
409
410 /* Drop RTS and DTR */
411 control_state &= ~(TIOCM_DTR | TIOCM_RTS);
412 if (BSA_USB_CMD(BELKIN_SA_SET_DTR_REQUEST, 0) < 0)
413 err("DTR LOW error");
414 if (BSA_USB_CMD(BELKIN_SA_SET_RTS_REQUEST, 0) < 0)
415 err("RTS LOW error");
416 }
417 }
418
419 /* set the parity */
420 if( (cflag&(PARENB|PARODD)) != (old_cflag&(PARENB|PARODD)) ) {
421 if (cflag & PARENB)
422 urb_value = (cflag & PARODD) ? BELKIN_SA_PARITY_ODD : BELKIN_SA_PARITY_EVEN;
423 else
424 urb_value = BELKIN_SA_PARITY_NONE;
425 if (BSA_USB_CMD(BELKIN_SA_SET_PARITY_REQUEST, urb_value) < 0)
426 err("Set parity error");
427 }
428
429 /* set the number of data bits */
430 if( (cflag&CSIZE) != (old_cflag&CSIZE) ) {
431 switch (cflag & CSIZE) {
432 case CS5: urb_value = BELKIN_SA_DATA_BITS(5); break;
433 case CS6: urb_value = BELKIN_SA_DATA_BITS(6); break;
434 case CS7: urb_value = BELKIN_SA_DATA_BITS(7); break;
435 case CS8: urb_value = BELKIN_SA_DATA_BITS(8); break;
436 default: err("CSIZE was not CS5-CS8, using default of 8");
437 urb_value = BELKIN_SA_DATA_BITS(8);
438 break;
439 }
440 if (BSA_USB_CMD(BELKIN_SA_SET_DATA_BITS_REQUEST, urb_value) < 0)
441 err("Set data bits error");
442 }
443
444 /* set the number of stop bits */
445 if( (cflag&CSTOPB) != (old_cflag&CSTOPB) ) {
446 urb_value = (cflag & CSTOPB) ? BELKIN_SA_STOP_BITS(2) : BELKIN_SA_STOP_BITS(1);
447 if (BSA_USB_CMD(BELKIN_SA_SET_STOP_BITS_REQUEST, urb_value) < 0)
448 err("Set stop bits error");
449 }
450
451 /* Set flow control */
452 if( (iflag&IXOFF) != (old_iflag&IXOFF)
453 || (iflag&IXON) != (old_iflag&IXON)
454 || (cflag&CRTSCTS) != (old_cflag&CRTSCTS) ) {
455 urb_value = 0;
456 if ((iflag & IXOFF) || (iflag & IXON))
457 urb_value |= (BELKIN_SA_FLOW_OXON | BELKIN_SA_FLOW_IXON);
458 else
459 urb_value &= ~(BELKIN_SA_FLOW_OXON | BELKIN_SA_FLOW_IXON);
460
461 if (cflag & CRTSCTS)
462 urb_value |= (BELKIN_SA_FLOW_OCTS | BELKIN_SA_FLOW_IRTS);
463 else
464 urb_value &= ~(BELKIN_SA_FLOW_OCTS | BELKIN_SA_FLOW_IRTS);
465
466 if (bad_flow_control)
467 urb_value &= ~(BELKIN_SA_FLOW_IRTS);
468
469 if (BSA_USB_CMD(BELKIN_SA_SET_FLOW_CTRL_REQUEST, urb_value) < 0)
470 err("Set flow control error");
471 }
472
473 /* save off the modified port settings */
474 spin_lock_irqsave(&priv->lock, flags);
475 priv->control_state = control_state;
476 spin_unlock_irqrestore(&priv->lock, flags);
477 } /* belkin_sa_set_termios */
478
479
480 static void belkin_sa_break_ctl( struct usb_serial_port *port, int break_state )
481 {
482 struct usb_serial *serial = port->serial;
483
484 if (BSA_USB_CMD(BELKIN_SA_SET_BREAK_REQUEST, break_state ? 1 : 0) < 0)
485 err("Set break_ctl %d", break_state);
486 }
487
488
489 static int belkin_sa_tiocmget (struct usb_serial_port *port, struct file *file)
490 {
491 struct belkin_sa_private *priv = usb_get_serial_port_data(port);
492 unsigned long control_state;
493 unsigned long flags;
494
495 dbg("%s", __FUNCTION__);
496
497 spin_lock_irqsave(&priv->lock, flags);
498 control_state = priv->control_state;
499 spin_unlock_irqrestore(&priv->lock, flags);
500
501 return control_state;
502 }
503
504
505 static int belkin_sa_tiocmset (struct usb_serial_port *port, struct file *file,
506 unsigned int set, unsigned int clear)
507 {
508 struct usb_serial *serial = port->serial;
509 struct belkin_sa_private *priv = usb_get_serial_port_data(port);
510 unsigned long control_state;
511 unsigned long flags;
512 int retval;
513 int rts = 0;
514 int dtr = 0;
515
516 dbg("%s", __FUNCTION__);
517
518 spin_lock_irqsave(&priv->lock, flags);
519 control_state = priv->control_state;
520
521 if (set & TIOCM_RTS) {
522 control_state |= TIOCM_RTS;
523 rts = 1;
524 }
525 if (set & TIOCM_DTR) {
526 control_state |= TIOCM_DTR;
527 dtr = 1;
528 }
529 if (clear & TIOCM_RTS) {
530 control_state &= ~TIOCM_RTS;
531 rts = 0;
532 }
533 if (clear & TIOCM_DTR) {
534 control_state &= ~TIOCM_DTR;
535 dtr = 0;
536 }
537
538 priv->control_state = control_state;
539 spin_unlock_irqrestore(&priv->lock, flags);
540
541 retval = BSA_USB_CMD(BELKIN_SA_SET_RTS_REQUEST, rts);
542 if (retval < 0) {
543 err("Set RTS error %d", retval);
544 goto exit;
545 }
546
547 retval = BSA_USB_CMD(BELKIN_SA_SET_DTR_REQUEST, dtr);
548 if (retval < 0) {
549 err("Set DTR error %d", retval);
550 goto exit;
551 }
552 exit:
553 return retval;
554 }
555
556
557 static int belkin_sa_ioctl (struct usb_serial_port *port, struct file * file, unsigned int cmd, unsigned long arg)
558 {
559 switch (cmd) {
560 case TIOCMIWAIT:
561 /* wait for any of the 4 modem inputs (DCD,RI,DSR,CTS)*/
562 /* TODO */
563 return( 0 );
564
565 case TIOCGICOUNT:
566 /* return count of modemline transitions */
567 /* TODO */
568 return 0;
569
570 default:
571 dbg("belkin_sa_ioctl arg not supported - 0x%04x",cmd);
572 return(-ENOIOCTLCMD);
573 break;
574 }
575 return 0;
576 } /* belkin_sa_ioctl */
577
578
579 static int __init belkin_sa_init (void)
580 {
581 int retval;
582 retval = usb_serial_register(&belkin_device);
583 if (retval)
584 goto failed_usb_serial_register;
585 retval = usb_register(&belkin_driver);
586 if (retval)
587 goto failed_usb_register;
588 info(DRIVER_DESC " " DRIVER_VERSION);
589 return 0;
590 failed_usb_register:
591 usb_serial_deregister(&belkin_device);
592 failed_usb_serial_register:
593 return retval;
594 }
595
596
597 static void __exit belkin_sa_exit (void)
598 {
599 usb_deregister (&belkin_driver);
600 usb_serial_deregister (&belkin_device);
601 }
602
603
604 module_init (belkin_sa_init);
605 module_exit (belkin_sa_exit);
606
607 MODULE_AUTHOR( DRIVER_AUTHOR );
608 MODULE_DESCRIPTION( DRIVER_DESC );
609 MODULE_VERSION( DRIVER_VERSION );
610 MODULE_LICENSE("GPL");
611
612 module_param(debug, bool, S_IRUGO | S_IWUSR);
613 MODULE_PARM_DESC(debug, "Debug enabled or not");
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