Commit | Line | Data |
---|---|---|
815ddc99 | 1 | /* |
2f430b4b WL |
2 | * Copyright (C) 2006 |
3 | * Simon Schulz (ark3116_driver <at> auctionant.de) | |
4 | * | |
815ddc99 GKH |
5 | * ark3116 |
6 | * - implements a driver for the arkmicro ark3116 chipset (vendor=0x6547, | |
7 | * productid=0x0232) (used in a datacable called KQ-U8A) | |
8 | * | |
9 | * - based on code by krisfx -> thanks !! | |
10 | * (see http://www.linuxquestions.org/questions/showthread.php?p=2184457#post2184457) | |
11 | * | |
12 | * - based on logs created by usbsnoopy | |
13 | * | |
815ddc99 GKH |
14 | * This program is free software; you can redistribute it and/or modify it |
15 | * under the terms of the GNU General Public License as published by the | |
16 | * Free Software Foundation; either version 2 of the License, or (at your | |
17 | * option) any later version. | |
18 | */ | |
19 | ||
20 | #include <linux/kernel.h> | |
21 | #include <linux/init.h> | |
22 | #include <linux/tty.h> | |
23 | #include <linux/module.h> | |
24 | #include <linux/usb.h> | |
a969888c | 25 | #include <linux/usb/serial.h> |
2f430b4b WL |
26 | #include <linux/serial.h> |
27 | #include <asm/uaccess.h> | |
815ddc99 GKH |
28 | |
29 | ||
30 | static int debug; | |
31 | ||
32 | static struct usb_device_id id_table [] = { | |
33 | { USB_DEVICE(0x6547, 0x0232) }, | |
34 | { }, | |
35 | }; | |
36 | MODULE_DEVICE_TABLE(usb, id_table); | |
37 | ||
38 | struct ark3116_private { | |
39 | spinlock_t lock; | |
40 | u8 termios_initialized; | |
41 | }; | |
42 | ||
43 | static inline void ARK3116_SND(struct usb_serial *serial, int seq, | |
44 | __u8 request, __u8 requesttype, | |
45 | __u16 value, __u16 index) | |
46 | { | |
47 | int result; | |
48 | result = usb_control_msg(serial->dev, | |
988440e7 | 49 | usb_sndctrlpipe(serial->dev, 0), |
815ddc99 | 50 | request, requesttype, value, index, |
988440e7 WL |
51 | NULL, 0x00, 1000); |
52 | dbg("%03d > ok", seq); | |
815ddc99 GKH |
53 | } |
54 | ||
55 | static inline void ARK3116_RCV(struct usb_serial *serial, int seq, | |
56 | __u8 request, __u8 requesttype, | |
57 | __u16 value, __u16 index, __u8 expected, | |
58 | char *buf) | |
59 | { | |
60 | int result; | |
61 | result = usb_control_msg(serial->dev, | |
988440e7 WL |
62 | usb_rcvctrlpipe(serial->dev, 0), |
63 | request, requesttype, value, index, | |
64 | buf, 0x0000001, 1000); | |
815ddc99 | 65 | if (result) |
b268f484 JE |
66 | dbg("%03d < %d bytes [0x%02X]", seq, result, |
67 | ((unsigned char *)buf)[0]); | |
815ddc99 GKH |
68 | else |
69 | dbg("%03d < 0 bytes", seq); | |
70 | } | |
71 | ||
815ddc99 GKH |
72 | static inline void ARK3116_RCV_QUIET(struct usb_serial *serial, |
73 | __u8 request, __u8 requesttype, | |
74 | __u16 value, __u16 index, char *buf) | |
75 | { | |
76 | usb_control_msg(serial->dev, | |
988440e7 | 77 | usb_rcvctrlpipe(serial->dev, 0), |
815ddc99 GKH |
78 | request, requesttype, value, index, |
79 | buf, 0x0000001, 1000); | |
80 | } | |
81 | ||
815ddc99 GKH |
82 | static int ark3116_attach(struct usb_serial *serial) |
83 | { | |
84 | char *buf; | |
85 | struct ark3116_private *priv; | |
86 | int i; | |
87 | ||
88 | for (i = 0; i < serial->num_ports; ++i) { | |
7ac9da10 | 89 | priv = kzalloc(sizeof(struct ark3116_private), GFP_KERNEL); |
815ddc99 GKH |
90 | if (!priv) |
91 | goto cleanup; | |
815ddc99 GKH |
92 | spin_lock_init(&priv->lock); |
93 | ||
94 | usb_set_serial_port_data(serial->port[i], priv); | |
95 | } | |
96 | ||
97 | buf = kmalloc(1, GFP_KERNEL); | |
98 | if (!buf) { | |
988440e7 | 99 | dbg("error kmalloc -> out of mem?"); |
815ddc99 GKH |
100 | goto cleanup; |
101 | } | |
102 | ||
103 | /* 3 */ | |
988440e7 WL |
104 | ARK3116_SND(serial, 3, 0xFE, 0x40, 0x0008, 0x0002); |
105 | ARK3116_SND(serial, 4, 0xFE, 0x40, 0x0008, 0x0001); | |
106 | ARK3116_SND(serial, 5, 0xFE, 0x40, 0x0000, 0x0008); | |
107 | ARK3116_SND(serial, 6, 0xFE, 0x40, 0x0000, 0x000B); | |
815ddc99 GKH |
108 | |
109 | /* <-- seq7 */ | |
988440e7 WL |
110 | ARK3116_RCV(serial, 7, 0xFE, 0xC0, 0x0000, 0x0003, 0x00, buf); |
111 | ARK3116_SND(serial, 8, 0xFE, 0x40, 0x0080, 0x0003); | |
112 | ARK3116_SND(serial, 9, 0xFE, 0x40, 0x001A, 0x0000); | |
113 | ARK3116_SND(serial, 10, 0xFE, 0x40, 0x0000, 0x0001); | |
114 | ARK3116_SND(serial, 11, 0xFE, 0x40, 0x0000, 0x0003); | |
815ddc99 GKH |
115 | |
116 | /* <-- seq12 */ | |
988440e7 WL |
117 | ARK3116_RCV(serial, 12, 0xFE, 0xC0, 0x0000, 0x0004, 0x00, buf); |
118 | ARK3116_SND(serial, 13, 0xFE, 0x40, 0x0000, 0x0004); | |
815ddc99 GKH |
119 | |
120 | /* 14 */ | |
988440e7 WL |
121 | ARK3116_RCV(serial, 14, 0xFE, 0xC0, 0x0000, 0x0004, 0x00, buf); |
122 | ARK3116_SND(serial, 15, 0xFE, 0x40, 0x0000, 0x0004); | |
815ddc99 GKH |
123 | |
124 | /* 16 */ | |
988440e7 | 125 | ARK3116_RCV(serial, 16, 0xFE, 0xC0, 0x0000, 0x0004, 0x00, buf); |
815ddc99 | 126 | /* --> seq17 */ |
988440e7 | 127 | ARK3116_SND(serial, 17, 0xFE, 0x40, 0x0001, 0x0004); |
815ddc99 GKH |
128 | |
129 | /* <-- seq18 */ | |
988440e7 | 130 | ARK3116_RCV(serial, 18, 0xFE, 0xC0, 0x0000, 0x0004, 0x01, buf); |
815ddc99 GKH |
131 | |
132 | /* --> seq19 */ | |
988440e7 | 133 | ARK3116_SND(serial, 19, 0xFE, 0x40, 0x0003, 0x0004); |
815ddc99 GKH |
134 | |
135 | /* <-- seq20 */ | |
988440e7 WL |
136 | /* seems like serial port status info (RTS, CTS, ...) */ |
137 | /* returns modem control line status?! */ | |
138 | ARK3116_RCV(serial, 20, 0xFE, 0xC0, 0x0000, 0x0006, 0xFF, buf); | |
139 | ||
140 | /* set 9600 baud & do some init?! */ | |
141 | ARK3116_SND(serial, 147, 0xFE, 0x40, 0x0083, 0x0003); | |
142 | ARK3116_SND(serial, 148, 0xFE, 0x40, 0x0038, 0x0000); | |
143 | ARK3116_SND(serial, 149, 0xFE, 0x40, 0x0001, 0x0001); | |
144 | ARK3116_SND(serial, 150, 0xFE, 0x40, 0x0003, 0x0003); | |
145 | ARK3116_RCV(serial, 151, 0xFE, 0xC0, 0x0000, 0x0004, 0x03, buf); | |
146 | ARK3116_SND(serial, 152, 0xFE, 0x40, 0x0000, 0x0003); | |
147 | ARK3116_RCV(serial, 153, 0xFE, 0xC0, 0x0000, 0x0003, 0x00, buf); | |
148 | ARK3116_SND(serial, 154, 0xFE, 0x40, 0x0003, 0x0003); | |
815ddc99 GKH |
149 | |
150 | kfree(buf); | |
988440e7 | 151 | return 0; |
815ddc99 GKH |
152 | |
153 | cleanup: | |
004b4f2d ON |
154 | for (--i; i >= 0; --i) { |
155 | kfree(usb_get_serial_port_data(serial->port[i])); | |
815ddc99 | 156 | usb_set_serial_port_data(serial->port[i], NULL); |
004b4f2d | 157 | } |
815ddc99 GKH |
158 | return -ENOMEM; |
159 | } | |
160 | ||
161 | static void ark3116_set_termios(struct usb_serial_port *port, | |
606d099c | 162 | struct ktermios *old_termios) |
815ddc99 GKH |
163 | { |
164 | struct usb_serial *serial = port->serial; | |
165 | struct ark3116_private *priv = usb_get_serial_port_data(port); | |
adb5dca1 AC |
166 | struct ktermios *termios = port->tty->termios; |
167 | unsigned int cflag = termios->c_cflag; | |
815ddc99 GKH |
168 | unsigned long flags; |
169 | int baud; | |
170 | int ark3116_baud; | |
171 | char *buf; | |
172 | char config; | |
173 | ||
174 | config = 0; | |
175 | ||
441b62c1 | 176 | dbg("%s - port %d", __func__, port->number); |
815ddc99 | 177 | |
815ddc99 GKH |
178 | spin_lock_irqsave(&priv->lock, flags); |
179 | if (!priv->termios_initialized) { | |
180 | *(port->tty->termios) = tty_std_termios; | |
988440e7 WL |
181 | port->tty->termios->c_cflag = B9600 | CS8 |
182 | | CREAD | HUPCL | CLOCAL; | |
adb5dca1 AC |
183 | termios->c_ispeed = 9600; |
184 | termios->c_ospeed = 9600; | |
815ddc99 GKH |
185 | priv->termios_initialized = 1; |
186 | } | |
187 | spin_unlock_irqrestore(&priv->lock, flags); | |
188 | ||
adb5dca1 AC |
189 | cflag = termios->c_cflag; |
190 | termios->c_cflag &= ~(CMSPAR|CRTSCTS); | |
815ddc99 | 191 | |
815ddc99 GKH |
192 | buf = kmalloc(1, GFP_KERNEL); |
193 | if (!buf) { | |
194 | dbg("error kmalloc"); | |
195 | return; | |
196 | } | |
197 | ||
198 | /* set data bit count (8/7/6/5) */ | |
988440e7 WL |
199 | if (cflag & CSIZE) { |
200 | switch (cflag & CSIZE) { | |
815ddc99 GKH |
201 | case CS5: |
202 | config |= 0x00; | |
203 | dbg("setting CS5"); | |
204 | break; | |
205 | case CS6: | |
206 | config |= 0x01; | |
207 | dbg("setting CS6"); | |
208 | break; | |
209 | case CS7: | |
210 | config |= 0x02; | |
211 | dbg("setting CS7"); | |
212 | break; | |
213 | default: | |
568c24ad | 214 | dbg("CSIZE was set but not CS5-CS8, using CS8!"); |
988440e7 | 215 | /* fall through */ |
815ddc99 GKH |
216 | case CS8: |
217 | config |= 0x03; | |
218 | dbg("setting CS8"); | |
219 | break; | |
220 | } | |
221 | } | |
222 | ||
988440e7 WL |
223 | /* set parity (NONE/EVEN/ODD) */ |
224 | if (cflag & PARENB) { | |
815ddc99 GKH |
225 | if (cflag & PARODD) { |
226 | config |= 0x08; | |
227 | dbg("setting parity to ODD"); | |
228 | } else { | |
229 | config |= 0x18; | |
230 | dbg("setting parity to EVEN"); | |
231 | } | |
232 | } else { | |
233 | dbg("setting parity to NONE"); | |
234 | } | |
235 | ||
988440e7 | 236 | /* set stop bit (1/2) */ |
815ddc99 GKH |
237 | if (cflag & CSTOPB) { |
238 | config |= 0x04; | |
988440e7 | 239 | dbg("setting 2 stop bits"); |
815ddc99 | 240 | } else { |
988440e7 | 241 | dbg("setting 1 stop bit"); |
815ddc99 GKH |
242 | } |
243 | ||
988440e7 | 244 | /* set baudrate */ |
568c24ad AC |
245 | baud = tty_get_baud_rate(port->tty); |
246 | ||
247 | switch (baud) { | |
248 | case 75: | |
249 | case 150: | |
250 | case 300: | |
251 | case 600: | |
252 | case 1200: | |
253 | case 1800: | |
254 | case 2400: | |
255 | case 4800: | |
256 | case 9600: | |
257 | case 19200: | |
258 | case 38400: | |
259 | case 57600: | |
260 | case 115200: | |
261 | case 230400: | |
262 | case 460800: | |
adb5dca1 AC |
263 | /* Report the resulting rate back to the caller */ |
264 | tty_encode_baud_rate(port->tty, baud, baud); | |
815ddc99 | 265 | break; |
568c24ad | 266 | /* set 9600 as default (if given baudrate is invalid for example) */ |
815ddc99 | 267 | default: |
adb5dca1 AC |
268 | tty_encode_baud_rate(port->tty, 9600, 9600); |
269 | case 0: | |
568c24ad | 270 | baud = 9600; |
815ddc99 GKH |
271 | } |
272 | ||
815ddc99 GKH |
273 | /* |
274 | * found by try'n'error, be careful, maybe there are other options | |
568c24ad | 275 | * for multiplicator etc! (3.5 for example) |
815ddc99 GKH |
276 | */ |
277 | if (baud == 460800) | |
278 | /* strange, for 460800 the formula is wrong | |
988440e7 | 279 | * if using round() then 9600baud is wrong) */ |
815ddc99 GKH |
280 | ark3116_baud = 7; |
281 | else | |
282 | ark3116_baud = 3000000 / baud; | |
283 | ||
284 | /* ? */ | |
988440e7 WL |
285 | ARK3116_RCV(serial, 0, 0xFE, 0xC0, 0x0000, 0x0003, 0x03, buf); |
286 | ||
815ddc99 GKH |
287 | /* offset = buf[0]; */ |
288 | /* offset = 0x03; */ | |
988440e7 | 289 | /* dbg("using 0x%04X as target for 0x0003:", 0x0080 + offset); */ |
815ddc99 GKH |
290 | |
291 | /* set baudrate */ | |
988440e7 WL |
292 | dbg("setting baudrate to %d (->reg=%d)", baud, ark3116_baud); |
293 | ARK3116_SND(serial, 147, 0xFE, 0x40, 0x0083, 0x0003); | |
294 | ARK3116_SND(serial, 148, 0xFE, 0x40, | |
295 | (ark3116_baud & 0x00FF), 0x0000); | |
296 | ARK3116_SND(serial, 149, 0xFE, 0x40, | |
297 | (ark3116_baud & 0xFF00) >> 8, 0x0001); | |
298 | ARK3116_SND(serial, 150, 0xFE, 0x40, 0x0003, 0x0003); | |
815ddc99 GKH |
299 | |
300 | /* ? */ | |
988440e7 WL |
301 | ARK3116_RCV(serial, 151, 0xFE, 0xC0, 0x0000, 0x0004, 0x03, buf); |
302 | ARK3116_SND(serial, 152, 0xFE, 0x40, 0x0000, 0x0003); | |
815ddc99 GKH |
303 | |
304 | /* set data bit count, stop bit count & parity: */ | |
305 | dbg("updating bit count, stop bit or parity (cfg=0x%02X)", config); | |
988440e7 WL |
306 | ARK3116_RCV(serial, 153, 0xFE, 0xC0, 0x0000, 0x0003, 0x00, buf); |
307 | ARK3116_SND(serial, 154, 0xFE, 0x40, config, 0x0003); | |
815ddc99 GKH |
308 | |
309 | if (cflag & CRTSCTS) | |
988440e7 | 310 | dbg("CRTSCTS not supported by chipset?!"); |
815ddc99 | 311 | |
988440e7 | 312 | /* TEST ARK3116_SND(154, 0xFE, 0x40, 0xFFFF, 0x0006); */ |
815ddc99 GKH |
313 | |
314 | kfree(buf); | |
adb5dca1 | 315 | |
815ddc99 GKH |
316 | return; |
317 | } | |
318 | ||
319 | static int ark3116_open(struct usb_serial_port *port, struct file *filp) | |
320 | { | |
606d099c | 321 | struct ktermios tmp_termios; |
815ddc99 GKH |
322 | struct usb_serial *serial = port->serial; |
323 | char *buf; | |
324 | int result = 0; | |
325 | ||
441b62c1 | 326 | dbg("%s - port %d", __func__, port->number); |
815ddc99 GKH |
327 | |
328 | buf = kmalloc(1, GFP_KERNEL); | |
329 | if (!buf) { | |
988440e7 | 330 | dbg("error kmalloc -> out of mem?"); |
815ddc99 GKH |
331 | return -ENOMEM; |
332 | } | |
333 | ||
334 | result = usb_serial_generic_open(port, filp); | |
335 | if (result) | |
4edf2c83 | 336 | goto err_out; |
815ddc99 GKH |
337 | |
338 | /* open */ | |
988440e7 | 339 | ARK3116_RCV(serial, 111, 0xFE, 0xC0, 0x0000, 0x0003, 0x02, buf); |
815ddc99 | 340 | |
988440e7 WL |
341 | ARK3116_SND(serial, 112, 0xFE, 0x40, 0x0082, 0x0003); |
342 | ARK3116_SND(serial, 113, 0xFE, 0x40, 0x001A, 0x0000); | |
343 | ARK3116_SND(serial, 114, 0xFE, 0x40, 0x0000, 0x0001); | |
344 | ARK3116_SND(serial, 115, 0xFE, 0x40, 0x0002, 0x0003); | |
815ddc99 | 345 | |
988440e7 WL |
346 | ARK3116_RCV(serial, 116, 0xFE, 0xC0, 0x0000, 0x0004, 0x03, buf); |
347 | ARK3116_SND(serial, 117, 0xFE, 0x40, 0x0002, 0x0004); | |
815ddc99 | 348 | |
988440e7 WL |
349 | ARK3116_RCV(serial, 118, 0xFE, 0xC0, 0x0000, 0x0004, 0x02, buf); |
350 | ARK3116_SND(serial, 119, 0xFE, 0x40, 0x0000, 0x0004); | |
815ddc99 | 351 | |
988440e7 | 352 | ARK3116_RCV(serial, 120, 0xFE, 0xC0, 0x0000, 0x0004, 0x00, buf); |
815ddc99 | 353 | |
988440e7 | 354 | ARK3116_SND(serial, 121, 0xFE, 0x40, 0x0001, 0x0004); |
815ddc99 | 355 | |
988440e7 | 356 | ARK3116_RCV(serial, 122, 0xFE, 0xC0, 0x0000, 0x0004, 0x01, buf); |
815ddc99 | 357 | |
988440e7 | 358 | ARK3116_SND(serial, 123, 0xFE, 0x40, 0x0003, 0x0004); |
815ddc99 | 359 | |
988440e7 WL |
360 | /* returns different values (control lines?!) */ |
361 | ARK3116_RCV(serial, 124, 0xFE, 0xC0, 0x0000, 0x0006, 0xFF, buf); | |
815ddc99 | 362 | |
988440e7 | 363 | /* initialise termios */ |
815ddc99 GKH |
364 | if (port->tty) |
365 | ark3116_set_termios(port, &tmp_termios); | |
366 | ||
4edf2c83 | 367 | err_out: |
815ddc99 GKH |
368 | kfree(buf); |
369 | ||
370 | return result; | |
815ddc99 GKH |
371 | } |
372 | ||
373 | static int ark3116_ioctl(struct usb_serial_port *port, struct file *file, | |
374 | unsigned int cmd, unsigned long arg) | |
375 | { | |
2f430b4b WL |
376 | struct serial_struct serstruct; |
377 | void __user *user_arg = (void __user *)arg; | |
378 | ||
379 | switch (cmd) { | |
380 | case TIOCGSERIAL: | |
381 | /* XXX: Some of these values are probably wrong. */ | |
382 | memset(&serstruct, 0, sizeof (serstruct)); | |
383 | serstruct.type = PORT_16654; | |
384 | serstruct.line = port->serial->minor; | |
385 | serstruct.port = port->number; | |
386 | serstruct.custom_divisor = 0; | |
387 | serstruct.baud_base = 460800; | |
388 | ||
389 | if (copy_to_user(user_arg, &serstruct, sizeof (serstruct))) | |
390 | return -EFAULT; | |
391 | ||
392 | return 0; | |
393 | case TIOCSSERIAL: | |
394 | if (copy_from_user(&serstruct, user_arg, sizeof (serstruct))) | |
395 | return -EFAULT; | |
396 | return 0; | |
397 | default: | |
441b62c1 | 398 | dbg("%s cmd 0x%04x not supported", __func__, cmd); |
2f430b4b WL |
399 | break; |
400 | } | |
401 | ||
815ddc99 GKH |
402 | return -ENOIOCTLCMD; |
403 | } | |
404 | ||
405 | static int ark3116_tiocmget(struct usb_serial_port *port, struct file *file) | |
406 | { | |
407 | struct usb_serial *serial = port->serial; | |
408 | char *buf; | |
409 | char temp; | |
410 | ||
988440e7 | 411 | /* seems like serial port status info (RTS, CTS, ...) is stored |
815ddc99 GKH |
412 | * in reg(?) 0x0006 |
413 | * pcb connection point 11 = GND -> sets bit4 of response | |
414 | * pcb connection point 7 = GND -> sets bit6 of response | |
415 | */ | |
416 | ||
417 | buf = kmalloc(1, GFP_KERNEL); | |
418 | if (!buf) { | |
419 | dbg("error kmalloc"); | |
420 | return -ENOMEM; | |
421 | } | |
422 | ||
988440e7 WL |
423 | /* read register */ |
424 | ARK3116_RCV_QUIET(serial, 0xFE, 0xC0, 0x0000, 0x0006, buf); | |
815ddc99 GKH |
425 | temp = buf[0]; |
426 | kfree(buf); | |
427 | ||
988440e7 WL |
428 | /* i do not really know if bit4=CTS and bit6=DSR... just a |
429 | * quick guess! | |
815ddc99 | 430 | */ |
988440e7 WL |
431 | return (temp & (1<<4) ? TIOCM_CTS : 0) |
432 | | (temp & (1<<6) ? TIOCM_DSR : 0); | |
815ddc99 GKH |
433 | } |
434 | ||
435 | static struct usb_driver ark3116_driver = { | |
436 | .name = "ark3116", | |
437 | .probe = usb_serial_probe, | |
438 | .disconnect = usb_serial_disconnect, | |
439 | .id_table = id_table, | |
d9b1b787 | 440 | .no_dynamic_id = 1, |
815ddc99 GKH |
441 | }; |
442 | ||
443 | static struct usb_serial_driver ark3116_device = { | |
444 | .driver = { | |
445 | .owner = THIS_MODULE, | |
446 | .name = "ark3116", | |
447 | }, | |
448 | .id_table = id_table, | |
d9b1b787 | 449 | .usb_driver = &ark3116_driver, |
815ddc99 GKH |
450 | .num_ports = 1, |
451 | .attach = ark3116_attach, | |
452 | .set_termios = ark3116_set_termios, | |
453 | .ioctl = ark3116_ioctl, | |
454 | .tiocmget = ark3116_tiocmget, | |
455 | .open = ark3116_open, | |
456 | }; | |
457 | ||
458 | static int __init ark3116_init(void) | |
459 | { | |
460 | int retval; | |
461 | ||
462 | retval = usb_serial_register(&ark3116_device); | |
463 | if (retval) | |
464 | return retval; | |
465 | retval = usb_register(&ark3116_driver); | |
466 | if (retval) | |
467 | usb_serial_deregister(&ark3116_device); | |
468 | return retval; | |
469 | } | |
470 | ||
471 | static void __exit ark3116_exit(void) | |
472 | { | |
473 | usb_deregister(&ark3116_driver); | |
474 | usb_serial_deregister(&ark3116_device); | |
475 | } | |
476 | ||
477 | module_init(ark3116_init); | |
478 | module_exit(ark3116_exit); | |
479 | MODULE_LICENSE("GPL"); | |
480 | ||
481 | module_param(debug, bool, S_IRUGO | S_IWUSR); | |
482 | MODULE_PARM_DESC(debug, "Debug enabled or not"); | |
483 |