Commit | Line | Data |
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1da177e4 LT |
1 | /* |
2 | * USB Empeg empeg-car player driver | |
3 | * | |
4 | * Copyright (C) 2000, 2001 | |
5 | * Gary Brubaker (xavyer@ix.netcom.com) | |
6 | * | |
7 | * Copyright (C) 1999 - 2001 | |
8 | * Greg Kroah-Hartman (greg@kroah.com) | |
9 | * | |
10 | * This program is free software; you can redistribute it and/or modify | |
11 | * it under the terms of the GNU General Public License, as published by | |
12 | * the Free Software Foundation, version 2. | |
13 | * | |
14 | * See Documentation/usb/usb-serial.txt for more information on using this driver | |
15 | * | |
16 | * (07/16/2001) gb | |
17 | * remove unused code in empeg_close() (thanks to Oliver Neukum for pointing this | |
18 | * out) and rewrote empeg_set_termios(). | |
19 | * | |
20 | * (05/30/2001) gkh | |
21 | * switched from using spinlock to a semaphore, which fixes lots of problems. | |
22 | * | |
23 | * (04/08/2001) gb | |
24 | * Identify version on module load. | |
25 | * | |
26 | * (01/22/2001) gb | |
27 | * Added write_room() and chars_in_buffer() support. | |
28 | * | |
29 | * (12/21/2000) gb | |
30 | * Moved termio stuff inside the port->active check. | |
31 | * Moved MOD_DEC_USE_COUNT to end of empeg_close(). | |
32 | * | |
33 | * (12/03/2000) gb | |
34 | * Added port->tty->ldisc.set_termios(port->tty, NULL) to empeg_open() | |
35 | * This notifies the tty driver that the termios have changed. | |
36 | * | |
37 | * (11/13/2000) gb | |
38 | * Moved tty->low_latency = 1 from empeg_read_bulk_callback() to empeg_open() | |
39 | * (It only needs to be set once - Doh!) | |
40 | * | |
41 | * (11/11/2000) gb | |
42 | * Updated to work with id_table structure. | |
43 | * | |
44 | * (11/04/2000) gb | |
45 | * Forked this from visor.c, and hacked it up to work with an | |
46 | * Empeg ltd. empeg-car player. Constructive criticism welcomed. | |
47 | * I would like to say, 'Thank You' to Greg Kroah-Hartman for the | |
48 | * use of his code, and for his guidance, advice and patience. :) | |
49 | * A 'Thank You' is in order for John Ripley of Empeg ltd for his | |
50 | * advice, and patience too. | |
51 | * | |
52 | */ | |
53 | ||
54 | #include <linux/config.h> | |
55 | #include <linux/kernel.h> | |
56 | #include <linux/errno.h> | |
57 | #include <linux/init.h> | |
58 | #include <linux/slab.h> | |
59 | #include <linux/tty.h> | |
60 | #include <linux/tty_driver.h> | |
61 | #include <linux/tty_flip.h> | |
62 | #include <linux/module.h> | |
63 | #include <linux/spinlock.h> | |
64 | #include <asm/uaccess.h> | |
65 | #include <linux/usb.h> | |
66 | #include "usb-serial.h" | |
67 | ||
68 | static int debug; | |
69 | ||
70 | /* | |
71 | * Version Information | |
72 | */ | |
73 | #define DRIVER_VERSION "v1.2" | |
74 | #define DRIVER_AUTHOR "Greg Kroah-Hartman <greg@kroah.com>, Gary Brubaker <xavyer@ix.netcom.com>" | |
75 | #define DRIVER_DESC "USB Empeg Mark I/II Driver" | |
76 | ||
77 | #define EMPEG_VENDOR_ID 0x084f | |
78 | #define EMPEG_PRODUCT_ID 0x0001 | |
79 | ||
80 | /* function prototypes for an empeg-car player */ | |
81 | static int empeg_open (struct usb_serial_port *port, struct file *filp); | |
82 | static void empeg_close (struct usb_serial_port *port, struct file *filp); | |
83 | static int empeg_write (struct usb_serial_port *port, | |
84 | const unsigned char *buf, | |
85 | int count); | |
86 | static int empeg_write_room (struct usb_serial_port *port); | |
87 | static int empeg_chars_in_buffer (struct usb_serial_port *port); | |
88 | static void empeg_throttle (struct usb_serial_port *port); | |
89 | static void empeg_unthrottle (struct usb_serial_port *port); | |
90 | static int empeg_startup (struct usb_serial *serial); | |
91 | static void empeg_shutdown (struct usb_serial *serial); | |
92 | static int empeg_ioctl (struct usb_serial_port *port, | |
93 | struct file * file, | |
94 | unsigned int cmd, | |
95 | unsigned long arg); | |
96 | static void empeg_set_termios (struct usb_serial_port *port, struct termios *old_termios); | |
97 | static void empeg_write_bulk_callback (struct urb *urb, struct pt_regs *regs); | |
98 | static void empeg_read_bulk_callback (struct urb *urb, struct pt_regs *regs); | |
99 | ||
100 | static struct usb_device_id id_table [] = { | |
101 | { USB_DEVICE(EMPEG_VENDOR_ID, EMPEG_PRODUCT_ID) }, | |
102 | { } /* Terminating entry */ | |
103 | }; | |
104 | ||
105 | MODULE_DEVICE_TABLE (usb, id_table); | |
106 | ||
107 | static struct usb_driver empeg_driver = { | |
108 | .owner = THIS_MODULE, | |
109 | .name = "empeg", | |
110 | .probe = usb_serial_probe, | |
111 | .disconnect = usb_serial_disconnect, | |
112 | .id_table = id_table, | |
113 | }; | |
114 | ||
115 | static struct usb_serial_device_type empeg_device = { | |
116 | .owner = THIS_MODULE, | |
117 | .name = "Empeg", | |
118 | .id_table = id_table, | |
119 | .num_interrupt_in = 0, | |
120 | .num_bulk_in = 1, | |
121 | .num_bulk_out = 1, | |
122 | .num_ports = 1, | |
123 | .open = empeg_open, | |
124 | .close = empeg_close, | |
125 | .throttle = empeg_throttle, | |
126 | .unthrottle = empeg_unthrottle, | |
127 | .attach = empeg_startup, | |
128 | .shutdown = empeg_shutdown, | |
129 | .ioctl = empeg_ioctl, | |
130 | .set_termios = empeg_set_termios, | |
131 | .write = empeg_write, | |
132 | .write_room = empeg_write_room, | |
133 | .chars_in_buffer = empeg_chars_in_buffer, | |
134 | .write_bulk_callback = empeg_write_bulk_callback, | |
135 | .read_bulk_callback = empeg_read_bulk_callback, | |
136 | }; | |
137 | ||
138 | #define NUM_URBS 16 | |
139 | #define URB_TRANSFER_BUFFER_SIZE 4096 | |
140 | ||
141 | static struct urb *write_urb_pool[NUM_URBS]; | |
142 | static spinlock_t write_urb_pool_lock; | |
143 | static int bytes_in; | |
144 | static int bytes_out; | |
145 | ||
146 | /****************************************************************************** | |
147 | * Empeg specific driver functions | |
148 | ******************************************************************************/ | |
149 | static int empeg_open (struct usb_serial_port *port, struct file *filp) | |
150 | { | |
151 | struct usb_serial *serial = port->serial; | |
152 | int result = 0; | |
153 | ||
154 | dbg("%s - port %d", __FUNCTION__, port->number); | |
155 | ||
156 | /* Force default termio settings */ | |
157 | empeg_set_termios (port, NULL) ; | |
158 | ||
159 | bytes_in = 0; | |
160 | bytes_out = 0; | |
161 | ||
162 | /* Start reading from the device */ | |
163 | usb_fill_bulk_urb( | |
164 | port->read_urb, | |
165 | serial->dev, | |
166 | usb_rcvbulkpipe(serial->dev, | |
167 | port->bulk_in_endpointAddress), | |
168 | port->read_urb->transfer_buffer, | |
169 | port->read_urb->transfer_buffer_length, | |
170 | empeg_read_bulk_callback, | |
171 | port); | |
172 | ||
173 | result = usb_submit_urb(port->read_urb, GFP_KERNEL); | |
174 | ||
175 | if (result) | |
176 | dev_err(&port->dev, "%s - failed submitting read urb, error %d\n", __FUNCTION__, result); | |
177 | ||
178 | return result; | |
179 | } | |
180 | ||
181 | ||
182 | static void empeg_close (struct usb_serial_port *port, struct file * filp) | |
183 | { | |
184 | dbg("%s - port %d", __FUNCTION__, port->number); | |
185 | ||
186 | /* shutdown our bulk read */ | |
187 | usb_kill_urb(port->read_urb); | |
188 | /* Uncomment the following line if you want to see some statistics in your syslog */ | |
189 | /* dev_info (&port->dev, "Bytes In = %d Bytes Out = %d\n", bytes_in, bytes_out); */ | |
190 | } | |
191 | ||
192 | ||
193 | static int empeg_write (struct usb_serial_port *port, const unsigned char *buf, int count) | |
194 | { | |
195 | struct usb_serial *serial = port->serial; | |
196 | struct urb *urb; | |
197 | const unsigned char *current_position = buf; | |
198 | unsigned long flags; | |
199 | int status; | |
200 | int i; | |
201 | int bytes_sent = 0; | |
202 | int transfer_size; | |
203 | ||
204 | dbg("%s - port %d", __FUNCTION__, port->number); | |
205 | ||
206 | while (count > 0) { | |
207 | ||
208 | /* try to find a free urb in our list of them */ | |
209 | urb = NULL; | |
210 | ||
211 | spin_lock_irqsave (&write_urb_pool_lock, flags); | |
212 | ||
213 | for (i = 0; i < NUM_URBS; ++i) { | |
214 | if (write_urb_pool[i]->status != -EINPROGRESS) { | |
215 | urb = write_urb_pool[i]; | |
216 | break; | |
217 | } | |
218 | } | |
219 | ||
220 | spin_unlock_irqrestore (&write_urb_pool_lock, flags); | |
221 | ||
222 | if (urb == NULL) { | |
223 | dbg("%s - no more free urbs", __FUNCTION__); | |
224 | goto exit; | |
225 | } | |
226 | ||
227 | if (urb->transfer_buffer == NULL) { | |
228 | urb->transfer_buffer = kmalloc (URB_TRANSFER_BUFFER_SIZE, GFP_ATOMIC); | |
229 | if (urb->transfer_buffer == NULL) { | |
230 | dev_err(&port->dev, "%s no more kernel memory...\n", __FUNCTION__); | |
231 | goto exit; | |
232 | } | |
233 | } | |
234 | ||
235 | transfer_size = min (count, URB_TRANSFER_BUFFER_SIZE); | |
236 | ||
237 | memcpy (urb->transfer_buffer, current_position, transfer_size); | |
238 | ||
239 | usb_serial_debug_data(debug, &port->dev, __FUNCTION__, transfer_size, urb->transfer_buffer); | |
240 | ||
241 | /* build up our urb */ | |
242 | usb_fill_bulk_urb ( | |
243 | urb, | |
244 | serial->dev, | |
245 | usb_sndbulkpipe(serial->dev, | |
246 | port->bulk_out_endpointAddress), | |
247 | urb->transfer_buffer, | |
248 | transfer_size, | |
249 | empeg_write_bulk_callback, | |
250 | port); | |
251 | ||
252 | /* send it down the pipe */ | |
253 | status = usb_submit_urb(urb, GFP_ATOMIC); | |
254 | if (status) { | |
255 | dev_err(&port->dev, "%s - usb_submit_urb(write bulk) failed with status = %d\n", __FUNCTION__, status); | |
256 | bytes_sent = status; | |
257 | break; | |
258 | } | |
259 | ||
260 | current_position += transfer_size; | |
261 | bytes_sent += transfer_size; | |
262 | count -= transfer_size; | |
263 | bytes_out += transfer_size; | |
264 | ||
265 | } | |
266 | ||
267 | exit: | |
268 | return bytes_sent; | |
269 | ||
270 | } | |
271 | ||
272 | ||
273 | static int empeg_write_room (struct usb_serial_port *port) | |
274 | { | |
275 | unsigned long flags; | |
276 | int i; | |
277 | int room = 0; | |
278 | ||
279 | dbg("%s - port %d", __FUNCTION__, port->number); | |
280 | ||
281 | spin_lock_irqsave (&write_urb_pool_lock, flags); | |
282 | ||
283 | /* tally up the number of bytes available */ | |
284 | for (i = 0; i < NUM_URBS; ++i) { | |
285 | if (write_urb_pool[i]->status != -EINPROGRESS) { | |
286 | room += URB_TRANSFER_BUFFER_SIZE; | |
287 | } | |
288 | } | |
289 | ||
290 | spin_unlock_irqrestore (&write_urb_pool_lock, flags); | |
291 | ||
292 | dbg("%s - returns %d", __FUNCTION__, room); | |
293 | ||
294 | return (room); | |
295 | ||
296 | } | |
297 | ||
298 | ||
299 | static int empeg_chars_in_buffer (struct usb_serial_port *port) | |
300 | { | |
301 | unsigned long flags; | |
302 | int i; | |
303 | int chars = 0; | |
304 | ||
305 | dbg("%s - port %d", __FUNCTION__, port->number); | |
306 | ||
307 | spin_lock_irqsave (&write_urb_pool_lock, flags); | |
308 | ||
309 | /* tally up the number of bytes waiting */ | |
310 | for (i = 0; i < NUM_URBS; ++i) { | |
311 | if (write_urb_pool[i]->status == -EINPROGRESS) { | |
312 | chars += URB_TRANSFER_BUFFER_SIZE; | |
313 | } | |
314 | } | |
315 | ||
316 | spin_unlock_irqrestore (&write_urb_pool_lock, flags); | |
317 | ||
318 | dbg("%s - returns %d", __FUNCTION__, chars); | |
319 | ||
320 | return (chars); | |
321 | ||
322 | } | |
323 | ||
324 | ||
325 | static void empeg_write_bulk_callback (struct urb *urb, struct pt_regs *regs) | |
326 | { | |
327 | struct usb_serial_port *port = (struct usb_serial_port *)urb->context; | |
328 | ||
329 | dbg("%s - port %d", __FUNCTION__, port->number); | |
330 | ||
331 | if (urb->status) { | |
332 | dbg("%s - nonzero write bulk status received: %d", __FUNCTION__, urb->status); | |
333 | return; | |
334 | } | |
335 | ||
336 | schedule_work(&port->work); | |
337 | } | |
338 | ||
339 | ||
340 | static void empeg_read_bulk_callback (struct urb *urb, struct pt_regs *regs) | |
341 | { | |
342 | struct usb_serial_port *port = (struct usb_serial_port *)urb->context; | |
343 | struct tty_struct *tty; | |
344 | unsigned char *data = urb->transfer_buffer; | |
345 | int i; | |
346 | int result; | |
347 | ||
348 | dbg("%s - port %d", __FUNCTION__, port->number); | |
349 | ||
350 | if (urb->status) { | |
351 | dbg("%s - nonzero read bulk status received: %d", __FUNCTION__, urb->status); | |
352 | return; | |
353 | } | |
354 | ||
355 | usb_serial_debug_data(debug, &port->dev, __FUNCTION__, urb->actual_length, data); | |
356 | ||
357 | tty = port->tty; | |
358 | ||
359 | if (urb->actual_length) { | |
360 | for (i = 0; i < urb->actual_length ; ++i) { | |
361 | /* gb - 2000/11/13 | |
362 | * If we insert too many characters we'll overflow the buffer. | |
363 | * This means we'll lose bytes - Decidedly bad. | |
364 | */ | |
365 | if(tty->flip.count >= TTY_FLIPBUF_SIZE) { | |
366 | tty_flip_buffer_push(tty); | |
367 | } | |
368 | tty_insert_flip_char(tty, data[i], 0); | |
369 | } | |
370 | /* gb - 2000/11/13 | |
371 | * Goes straight through instead of scheduling - if tty->low_latency is set. | |
372 | */ | |
373 | tty_flip_buffer_push(tty); | |
374 | bytes_in += urb->actual_length; | |
375 | } | |
376 | ||
377 | /* Continue trying to always read */ | |
378 | usb_fill_bulk_urb( | |
379 | port->read_urb, | |
380 | port->serial->dev, | |
381 | usb_rcvbulkpipe(port->serial->dev, | |
382 | port->bulk_in_endpointAddress), | |
383 | port->read_urb->transfer_buffer, | |
384 | port->read_urb->transfer_buffer_length, | |
385 | empeg_read_bulk_callback, | |
386 | port); | |
387 | ||
388 | result = usb_submit_urb(port->read_urb, GFP_ATOMIC); | |
389 | ||
390 | if (result) | |
391 | dev_err(&urb->dev->dev, "%s - failed resubmitting read urb, error %d\n", __FUNCTION__, result); | |
392 | ||
393 | return; | |
394 | ||
395 | } | |
396 | ||
397 | ||
398 | static void empeg_throttle (struct usb_serial_port *port) | |
399 | { | |
400 | dbg("%s - port %d", __FUNCTION__, port->number); | |
401 | usb_kill_urb(port->read_urb); | |
402 | } | |
403 | ||
404 | ||
405 | static void empeg_unthrottle (struct usb_serial_port *port) | |
406 | { | |
407 | int result; | |
408 | ||
409 | dbg("%s - port %d", __FUNCTION__, port->number); | |
410 | ||
411 | port->read_urb->dev = port->serial->dev; | |
412 | ||
413 | result = usb_submit_urb(port->read_urb, GFP_ATOMIC); | |
414 | ||
415 | if (result) | |
416 | dev_err(&port->dev, "%s - failed submitting read urb, error %d\n", __FUNCTION__, result); | |
417 | ||
418 | return; | |
419 | } | |
420 | ||
421 | ||
422 | static int empeg_startup (struct usb_serial *serial) | |
423 | { | |
424 | int r; | |
425 | ||
426 | dbg("%s", __FUNCTION__); | |
427 | ||
428 | if (serial->dev->actconfig->desc.bConfigurationValue != 1) { | |
429 | err("active config #%d != 1 ??", | |
430 | serial->dev->actconfig->desc.bConfigurationValue); | |
431 | return -ENODEV; | |
432 | } | |
433 | dbg("%s - reset config", __FUNCTION__); | |
434 | r = usb_reset_configuration (serial->dev); | |
435 | ||
436 | /* continue on with initialization */ | |
437 | return r; | |
438 | ||
439 | } | |
440 | ||
441 | ||
442 | static void empeg_shutdown (struct usb_serial *serial) | |
443 | { | |
444 | dbg ("%s", __FUNCTION__); | |
445 | } | |
446 | ||
447 | ||
448 | static int empeg_ioctl (struct usb_serial_port *port, struct file * file, unsigned int cmd, unsigned long arg) | |
449 | { | |
450 | dbg("%s - port %d, cmd 0x%.4x", __FUNCTION__, port->number, cmd); | |
451 | ||
452 | return -ENOIOCTLCMD; | |
453 | } | |
454 | ||
455 | ||
456 | static void empeg_set_termios (struct usb_serial_port *port, struct termios *old_termios) | |
457 | { | |
458 | ||
459 | dbg("%s - port %d", __FUNCTION__, port->number); | |
460 | ||
461 | if ((!port->tty) || (!port->tty->termios)) { | |
462 | dbg("%s - no tty structures", __FUNCTION__); | |
463 | return; | |
464 | } | |
465 | ||
466 | /* | |
467 | * The empeg-car player wants these particular tty settings. | |
468 | * You could, for example, change the baud rate, however the | |
469 | * player only supports 115200 (currently), so there is really | |
470 | * no point in support for changes to the tty settings. | |
471 | * (at least for now) | |
472 | * | |
473 | * The default requirements for this device are: | |
474 | */ | |
475 | port->tty->termios->c_iflag | |
476 | &= ~(IGNBRK /* disable ignore break */ | |
477 | | BRKINT /* disable break causes interrupt */ | |
478 | | PARMRK /* disable mark parity errors */ | |
479 | | ISTRIP /* disable clear high bit of input characters */ | |
480 | | INLCR /* disable translate NL to CR */ | |
481 | | IGNCR /* disable ignore CR */ | |
482 | | ICRNL /* disable translate CR to NL */ | |
483 | | IXON); /* disable enable XON/XOFF flow control */ | |
484 | ||
485 | port->tty->termios->c_oflag | |
486 | &= ~OPOST; /* disable postprocess output characters */ | |
487 | ||
488 | port->tty->termios->c_lflag | |
489 | &= ~(ECHO /* disable echo input characters */ | |
490 | | ECHONL /* disable echo new line */ | |
491 | | ICANON /* disable erase, kill, werase, and rprnt special characters */ | |
492 | | ISIG /* disable interrupt, quit, and suspend special characters */ | |
493 | | IEXTEN); /* disable non-POSIX special characters */ | |
494 | ||
495 | port->tty->termios->c_cflag | |
496 | &= ~(CSIZE /* no size */ | |
497 | | PARENB /* disable parity bit */ | |
498 | | CBAUD); /* clear current baud rate */ | |
499 | ||
500 | port->tty->termios->c_cflag | |
501 | |= (CS8 /* character size 8 bits */ | |
502 | | B115200); /* baud rate 115200 */ | |
503 | ||
504 | /* | |
505 | * Force low_latency on; otherwise the pushes are scheduled; | |
506 | * this is bad as it opens up the possibility of dropping bytes | |
507 | * on the floor. We don't want to drop bytes on the floor. :) | |
508 | */ | |
509 | port->tty->low_latency = 1; | |
510 | ||
511 | return; | |
512 | } | |
513 | ||
514 | ||
515 | static int __init empeg_init (void) | |
516 | { | |
517 | struct urb *urb; | |
518 | int i, retval; | |
519 | ||
520 | /* create our write urb pool and transfer buffers */ | |
521 | spin_lock_init (&write_urb_pool_lock); | |
522 | for (i = 0; i < NUM_URBS; ++i) { | |
523 | urb = usb_alloc_urb(0, GFP_KERNEL); | |
524 | write_urb_pool[i] = urb; | |
525 | if (urb == NULL) { | |
526 | err("No more urbs???"); | |
527 | continue; | |
528 | } | |
529 | ||
530 | urb->transfer_buffer = kmalloc (URB_TRANSFER_BUFFER_SIZE, GFP_KERNEL); | |
531 | if (!urb->transfer_buffer) { | |
532 | err("%s - out of memory for urb buffers.", | |
533 | __FUNCTION__); | |
534 | continue; | |
535 | } | |
536 | } | |
537 | ||
538 | retval = usb_serial_register(&empeg_device); | |
539 | if (retval) | |
540 | goto failed_usb_serial_register; | |
541 | retval = usb_register(&empeg_driver); | |
542 | if (retval) | |
543 | goto failed_usb_register; | |
544 | ||
545 | info(DRIVER_VERSION ":" DRIVER_DESC); | |
546 | ||
547 | return 0; | |
548 | failed_usb_register: | |
549 | usb_serial_deregister(&empeg_device); | |
550 | failed_usb_serial_register: | |
551 | for (i = 0; i < NUM_URBS; ++i) { | |
552 | if (write_urb_pool[i]) { | |
1bc3c9e1 | 553 | kfree(write_urb_pool[i]->transfer_buffer); |
1da177e4 LT |
554 | usb_free_urb(write_urb_pool[i]); |
555 | } | |
556 | } | |
557 | return retval; | |
558 | } | |
559 | ||
560 | ||
561 | static void __exit empeg_exit (void) | |
562 | { | |
563 | int i; | |
564 | unsigned long flags; | |
565 | ||
566 | usb_deregister(&empeg_driver); | |
567 | usb_serial_deregister (&empeg_device); | |
568 | ||
569 | spin_lock_irqsave (&write_urb_pool_lock, flags); | |
570 | ||
571 | for (i = 0; i < NUM_URBS; ++i) { | |
572 | if (write_urb_pool[i]) { | |
573 | /* FIXME - uncomment the following usb_kill_urb call when | |
574 | * the host controllers get fixed to set urb->dev = NULL after | |
575 | * the urb is finished. Otherwise this call oopses. */ | |
576 | /* usb_kill_urb(write_urb_pool[i]); */ | |
1bc3c9e1 | 577 | kfree(write_urb_pool[i]->transfer_buffer); |
1da177e4 LT |
578 | usb_free_urb (write_urb_pool[i]); |
579 | } | |
580 | } | |
581 | ||
582 | spin_unlock_irqrestore (&write_urb_pool_lock, flags); | |
583 | } | |
584 | ||
585 | ||
586 | module_init(empeg_init); | |
587 | module_exit(empeg_exit); | |
588 | ||
589 | MODULE_AUTHOR( DRIVER_AUTHOR ); | |
590 | MODULE_DESCRIPTION( DRIVER_DESC ); | |
591 | MODULE_LICENSE("GPL"); | |
592 | ||
593 | module_param(debug, bool, S_IRUGO | S_IWUSR); | |
594 | MODULE_PARM_DESC(debug, "Debug enabled or not"); |