xref: /linux/drivers/usb/serial/belkin_sa.c (revision 6e8331ac6973435b1e7604c30f2ad394035b46e1)
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/kernel.h>
67 #include <linux/errno.h>
68 #include <linux/init.h>
69 #include <linux/slab.h>
70 #include <linux/tty.h>
71 #include <linux/tty_driver.h>
72 #include <linux/tty_flip.h>
73 #include <linux/module.h>
74 #include <linux/spinlock.h>
75 #include <asm/uaccess.h>
76 #include <linux/usb.h>
77 #include <linux/usb/serial.h>
78 #include "belkin_sa.h"
79 
80 static int debug;
81 
82 /*
83  * Version Information
84  */
85 #define DRIVER_VERSION "v1.2"
86 #define DRIVER_AUTHOR "William Greathouse <wgreathouse@smva.com>"
87 #define DRIVER_DESC "USB Belkin Serial converter driver"
88 
89 /* function prototypes for a Belkin USB Serial Adapter F5U103 */
90 static int  belkin_sa_startup		(struct usb_serial *serial);
91 static void belkin_sa_shutdown		(struct usb_serial *serial);
92 static int  belkin_sa_open		(struct usb_serial_port *port, struct file *filp);
93 static void belkin_sa_close		(struct usb_serial_port *port, struct file *filp);
94 static void belkin_sa_read_int_callback (struct urb *urb, struct pt_regs *regs);
95 static void belkin_sa_set_termios	(struct usb_serial_port *port, struct termios * old);
96 static int  belkin_sa_ioctl		(struct usb_serial_port *port, struct file * file, unsigned int cmd, unsigned long arg);
97 static void belkin_sa_break_ctl		(struct usb_serial_port *port, int break_state );
98 static int  belkin_sa_tiocmget		(struct usb_serial_port *port, struct file *file);
99 static int  belkin_sa_tiocmset		(struct usb_serial_port *port, struct file *file, unsigned int set, unsigned int clear);
100 
101 
102 static struct usb_device_id id_table_combined [] = {
103 	{ USB_DEVICE(BELKIN_SA_VID, BELKIN_SA_PID) },
104 	{ USB_DEVICE(BELKIN_OLD_VID, BELKIN_OLD_PID) },
105 	{ USB_DEVICE(PERACOM_VID, PERACOM_PID) },
106 	{ USB_DEVICE(GOHUBS_VID, GOHUBS_PID) },
107 	{ USB_DEVICE(GOHUBS_VID, HANDYLINK_PID) },
108 	{ USB_DEVICE(BELKIN_DOCKSTATION_VID, BELKIN_DOCKSTATION_PID) },
109 	{ }							/* Terminating entry */
110 };
111 
112 MODULE_DEVICE_TABLE (usb, id_table_combined);
113 
114 static struct usb_driver belkin_driver = {
115 	.name =		"belkin",
116 	.probe =	usb_serial_probe,
117 	.disconnect =	usb_serial_disconnect,
118 	.id_table =	id_table_combined,
119 	.no_dynamic_id = 	1,
120 };
121 
122 /* All of the device info needed for the serial converters */
123 static struct usb_serial_driver belkin_device = {
124 	.driver = {
125 		.owner =	THIS_MODULE,
126 		.name =		"belkin",
127 	},
128 	.description =		"Belkin / Peracom / GoHubs USB Serial Adapter",
129 	.id_table =		id_table_combined,
130 	.num_interrupt_in =	1,
131 	.num_bulk_in =		1,
132 	.num_bulk_out =		1,
133 	.num_ports =		1,
134 	.open =			belkin_sa_open,
135 	.close =		belkin_sa_close,
136 	.read_int_callback =	belkin_sa_read_int_callback,	/* How we get the status info */
137 	.ioctl =		belkin_sa_ioctl,
138 	.set_termios =		belkin_sa_set_termios,
139 	.break_ctl =		belkin_sa_break_ctl,
140 	.tiocmget =		belkin_sa_tiocmget,
141 	.tiocmset =		belkin_sa_tiocmset,
142 	.attach =		belkin_sa_startup,
143 	.shutdown =		belkin_sa_shutdown,
144 };
145 
146 
147 struct belkin_sa_private {
148 	spinlock_t		lock;
149 	unsigned long		control_state;
150 	unsigned char		last_lsr;
151 	unsigned char		last_msr;
152 	int			bad_flow_control;
153 };
154 
155 
156 /*
157  * ***************************************************************************
158  * Belkin USB Serial Adapter F5U103 specific driver functions
159  * ***************************************************************************
160  */
161 
162 #define WDR_TIMEOUT 5000 /* default urb timeout */
163 
164 /* assumes that struct usb_serial *serial is available */
165 #define BSA_USB_CMD(c,v) usb_control_msg(serial->dev, usb_sndctrlpipe(serial->dev, 0), \
166 					    (c), BELKIN_SA_SET_REQUEST_TYPE, \
167 					    (v), 0, NULL, 0, WDR_TIMEOUT)
168 
169 /* do some startup allocations not currently performed by usb_serial_probe() */
170 static int belkin_sa_startup (struct usb_serial *serial)
171 {
172 	struct usb_device *dev = serial->dev;
173 	struct belkin_sa_private *priv;
174 
175 	/* allocate the private data structure */
176 	priv = kmalloc(sizeof(struct belkin_sa_private), GFP_KERNEL);
177 	if (!priv)
178 		return (-1); /* error */
179 	/* set initial values for control structures */
180 	spin_lock_init(&priv->lock);
181 	priv->control_state = 0;
182 	priv->last_lsr = 0;
183 	priv->last_msr = 0;
184 	/* see comments at top of file */
185 	priv->bad_flow_control = (le16_to_cpu(dev->descriptor.bcdDevice) <= 0x0206) ? 1 : 0;
186 	info("bcdDevice: %04x, bfc: %d", le16_to_cpu(dev->descriptor.bcdDevice), priv->bad_flow_control);
187 
188 	init_waitqueue_head(&serial->port[0]->write_wait);
189 	usb_set_serial_port_data(serial->port[0], priv);
190 
191 	return (0);
192 }
193 
194 
195 static void belkin_sa_shutdown (struct usb_serial *serial)
196 {
197 	struct belkin_sa_private *priv;
198 	int i;
199 
200 	dbg ("%s", __FUNCTION__);
201 
202 	/* stop reads and writes on all ports */
203 	for (i=0; i < serial->num_ports; ++i) {
204 		/* My special items, the standard routines free my urbs */
205 		priv = usb_get_serial_port_data(serial->port[i]);
206 		kfree(priv);
207 	}
208 }
209 
210 
211 static int  belkin_sa_open (struct usb_serial_port *port, struct file *filp)
212 {
213 	int retval = 0;
214 
215 	dbg("%s port %d", __FUNCTION__, port->number);
216 
217 	/*Start reading from the device*/
218 	/* TODO: Look at possibility of submitting multiple URBs to device to
219 	 *       enhance buffering.  Win trace shows 16 initial read URBs.
220 	 */
221 	port->read_urb->dev = port->serial->dev;
222 	retval = usb_submit_urb(port->read_urb, GFP_KERNEL);
223 	if (retval) {
224 		err("usb_submit_urb(read bulk) failed");
225 		goto exit;
226 	}
227 
228 	port->interrupt_in_urb->dev = port->serial->dev;
229 	retval = usb_submit_urb(port->interrupt_in_urb, GFP_KERNEL);
230 	if (retval) {
231 		usb_kill_urb(port->read_urb);
232 		err(" usb_submit_urb(read int) failed");
233 	}
234 
235 exit:
236 	return retval;
237 } /* belkin_sa_open */
238 
239 
240 static void belkin_sa_close (struct usb_serial_port *port, struct file *filp)
241 {
242 	dbg("%s port %d", __FUNCTION__, port->number);
243 
244 	/* shutdown our bulk reads and writes */
245 	usb_kill_urb(port->write_urb);
246 	usb_kill_urb(port->read_urb);
247 	usb_kill_urb(port->interrupt_in_urb);
248 } /* belkin_sa_close */
249 
250 
251 static void belkin_sa_read_int_callback (struct urb *urb, struct pt_regs *regs)
252 {
253 	struct usb_serial_port *port = (struct usb_serial_port *)urb->context;
254 	struct belkin_sa_private *priv;
255 	unsigned char *data = urb->transfer_buffer;
256 	int retval;
257 	unsigned long flags;
258 
259 	switch (urb->status) {
260 	case 0:
261 		/* success */
262 		break;
263 	case -ECONNRESET:
264 	case -ENOENT:
265 	case -ESHUTDOWN:
266 		/* this urb is terminated, clean up */
267 		dbg("%s - urb shutting down with status: %d", __FUNCTION__, urb->status);
268 		return;
269 	default:
270 		dbg("%s - nonzero urb status received: %d", __FUNCTION__, urb->status);
271 		goto exit;
272 	}
273 
274 	usb_serial_debug_data(debug, &port->dev, __FUNCTION__, urb->actual_length, data);
275 
276 	/* Handle known interrupt data */
277 	/* ignore data[0] and data[1] */
278 
279 	priv = usb_get_serial_port_data(port);
280 	spin_lock_irqsave(&priv->lock, flags);
281 	priv->last_msr = data[BELKIN_SA_MSR_INDEX];
282 
283 	/* Record Control Line states */
284 	if (priv->last_msr & BELKIN_SA_MSR_DSR)
285 		priv->control_state |= TIOCM_DSR;
286 	else
287 		priv->control_state &= ~TIOCM_DSR;
288 
289 	if (priv->last_msr & BELKIN_SA_MSR_CTS)
290 		priv->control_state |= TIOCM_CTS;
291 	else
292 		priv->control_state &= ~TIOCM_CTS;
293 
294 	if (priv->last_msr & BELKIN_SA_MSR_RI)
295 		priv->control_state |= TIOCM_RI;
296 	else
297 		priv->control_state &= ~TIOCM_RI;
298 
299 	if (priv->last_msr & BELKIN_SA_MSR_CD)
300 		priv->control_state |= TIOCM_CD;
301 	else
302 		priv->control_state &= ~TIOCM_CD;
303 
304 	/* Now to report any errors */
305 	priv->last_lsr = data[BELKIN_SA_LSR_INDEX];
306 #if 0
307 	/*
308 	 * fill in the flip buffer here, but I do not know the relation
309 	 * to the current/next receive buffer or characters.  I need
310 	 * to look in to this before committing any code.
311 	 */
312 	if (priv->last_lsr & BELKIN_SA_LSR_ERR) {
313 		tty = port->tty;
314 		/* Overrun Error */
315 		if (priv->last_lsr & BELKIN_SA_LSR_OE) {
316 		}
317 		/* Parity Error */
318 		if (priv->last_lsr & BELKIN_SA_LSR_PE) {
319 		}
320 		/* Framing Error */
321 		if (priv->last_lsr & BELKIN_SA_LSR_FE) {
322 		}
323 		/* Break Indicator */
324 		if (priv->last_lsr & BELKIN_SA_LSR_BI) {
325 		}
326 	}
327 #endif
328 	spin_unlock_irqrestore(&priv->lock, flags);
329 exit:
330 	retval = usb_submit_urb (urb, GFP_ATOMIC);
331 	if (retval)
332 		err ("%s - usb_submit_urb failed with result %d",
333 		     __FUNCTION__, retval);
334 }
335 
336 static void belkin_sa_set_termios (struct usb_serial_port *port, struct termios *old_termios)
337 {
338 	struct usb_serial *serial = port->serial;
339 	struct belkin_sa_private *priv = usb_get_serial_port_data(port);
340 	unsigned int iflag;
341 	unsigned int cflag;
342 	unsigned int old_iflag = 0;
343 	unsigned int old_cflag = 0;
344 	__u16 urb_value = 0; /* Will hold the new flags */
345 	unsigned long flags;
346 	unsigned long control_state;
347 	int bad_flow_control;
348 
349 	if ((!port->tty) || (!port->tty->termios)) {
350 		dbg ("%s - no tty or termios structure", __FUNCTION__);
351 		return;
352 	}
353 
354 	iflag = port->tty->termios->c_iflag;
355 	cflag = port->tty->termios->c_cflag;
356 
357 	/* get a local copy of the current port settings */
358 	spin_lock_irqsave(&priv->lock, flags);
359 	control_state = priv->control_state;
360 	bad_flow_control = priv->bad_flow_control;
361 	spin_unlock_irqrestore(&priv->lock, flags);
362 
363 	/* check that they really want us to change something */
364 	if (old_termios) {
365 		if ((cflag == old_termios->c_cflag) &&
366 		    (RELEVANT_IFLAG(port->tty->termios->c_iflag) == RELEVANT_IFLAG(old_termios->c_iflag))) {
367 			dbg("%s - nothing to change...", __FUNCTION__);
368 			return;
369 		}
370 		old_iflag = old_termios->c_iflag;
371 		old_cflag = old_termios->c_cflag;
372 	}
373 
374 	/* Set the baud rate */
375 	if( (cflag&CBAUD) != (old_cflag&CBAUD) ) {
376 		/* reassert DTR and (maybe) RTS on transition from B0 */
377 		if( (old_cflag&CBAUD) == B0 ) {
378 			control_state |= (TIOCM_DTR|TIOCM_RTS);
379 			if (BSA_USB_CMD(BELKIN_SA_SET_DTR_REQUEST, 1) < 0)
380 				err("Set DTR error");
381 			/* don't set RTS if using hardware flow control */
382 			if (!(old_cflag&CRTSCTS) )
383 				if (BSA_USB_CMD(BELKIN_SA_SET_RTS_REQUEST, 1) < 0)
384 					err("Set RTS error");
385 		}
386 
387 		switch(cflag & CBAUD) {
388 			case B0: /* handled below */ break;
389 			case B300: urb_value = BELKIN_SA_BAUD(300); break;
390 			case B600: urb_value = BELKIN_SA_BAUD(600); break;
391 			case B1200: urb_value = BELKIN_SA_BAUD(1200); break;
392 			case B2400: urb_value = BELKIN_SA_BAUD(2400); break;
393 			case B4800: urb_value = BELKIN_SA_BAUD(4800); break;
394 			case B9600: urb_value = BELKIN_SA_BAUD(9600); break;
395 			case B19200: urb_value = BELKIN_SA_BAUD(19200); break;
396 			case B38400: urb_value = BELKIN_SA_BAUD(38400); break;
397 			case B57600: urb_value = BELKIN_SA_BAUD(57600); break;
398 			case B115200: urb_value = BELKIN_SA_BAUD(115200); break;
399 			case B230400: urb_value = BELKIN_SA_BAUD(230400); break;
400 			default: err("BELKIN USB Serial Adapter: unsupported baudrate request, using default of 9600");
401 				urb_value = BELKIN_SA_BAUD(9600); break;
402 		}
403 		if ((cflag & CBAUD) != B0 ) {
404 			if (BSA_USB_CMD(BELKIN_SA_SET_BAUDRATE_REQUEST, urb_value) < 0)
405 				err("Set baudrate error");
406 		} else {
407 			/* Disable flow control */
408 			if (BSA_USB_CMD(BELKIN_SA_SET_FLOW_CTRL_REQUEST, BELKIN_SA_FLOW_NONE) < 0)
409 				err("Disable flowcontrol error");
410 
411 			/* Drop RTS and DTR */
412 			control_state &= ~(TIOCM_DTR | TIOCM_RTS);
413 			if (BSA_USB_CMD(BELKIN_SA_SET_DTR_REQUEST, 0) < 0)
414 				err("DTR LOW error");
415 			if (BSA_USB_CMD(BELKIN_SA_SET_RTS_REQUEST, 0) < 0)
416 				err("RTS LOW error");
417 		}
418 	}
419 
420 	/* set the parity */
421 	if( (cflag&(PARENB|PARODD)) != (old_cflag&(PARENB|PARODD)) ) {
422 		if (cflag & PARENB)
423 			urb_value = (cflag & PARODD) ?  BELKIN_SA_PARITY_ODD : BELKIN_SA_PARITY_EVEN;
424 		else
425 			urb_value = BELKIN_SA_PARITY_NONE;
426 		if (BSA_USB_CMD(BELKIN_SA_SET_PARITY_REQUEST, urb_value) < 0)
427 			err("Set parity error");
428 	}
429 
430 	/* set the number of data bits */
431 	if( (cflag&CSIZE) != (old_cflag&CSIZE) ) {
432 		switch (cflag & CSIZE) {
433 			case CS5: urb_value = BELKIN_SA_DATA_BITS(5); break;
434 			case CS6: urb_value = BELKIN_SA_DATA_BITS(6); break;
435 			case CS7: urb_value = BELKIN_SA_DATA_BITS(7); break;
436 			case CS8: urb_value = BELKIN_SA_DATA_BITS(8); break;
437 			default: err("CSIZE was not CS5-CS8, using default of 8");
438 				urb_value = BELKIN_SA_DATA_BITS(8);
439 				break;
440 		}
441 		if (BSA_USB_CMD(BELKIN_SA_SET_DATA_BITS_REQUEST, urb_value) < 0)
442 			err("Set data bits error");
443 	}
444 
445 	/* set the number of stop bits */
446 	if( (cflag&CSTOPB) != (old_cflag&CSTOPB) ) {
447 		urb_value = (cflag & CSTOPB) ? BELKIN_SA_STOP_BITS(2) : BELKIN_SA_STOP_BITS(1);
448 		if (BSA_USB_CMD(BELKIN_SA_SET_STOP_BITS_REQUEST, urb_value) < 0)
449 			err("Set stop bits error");
450 	}
451 
452 	/* Set flow control */
453 	if( (iflag&IXOFF)   != (old_iflag&IXOFF)
454 	||	(iflag&IXON)    != (old_iflag&IXON)
455 	||  (cflag&CRTSCTS) != (old_cflag&CRTSCTS) ) {
456 		urb_value = 0;
457 		if ((iflag & IXOFF) || (iflag & IXON))
458 			urb_value |= (BELKIN_SA_FLOW_OXON | BELKIN_SA_FLOW_IXON);
459 		else
460 			urb_value &= ~(BELKIN_SA_FLOW_OXON | BELKIN_SA_FLOW_IXON);
461 
462 		if (cflag & CRTSCTS)
463 			urb_value |=  (BELKIN_SA_FLOW_OCTS | BELKIN_SA_FLOW_IRTS);
464 		else
465 			urb_value &= ~(BELKIN_SA_FLOW_OCTS | BELKIN_SA_FLOW_IRTS);
466 
467 		if (bad_flow_control)
468 			urb_value &= ~(BELKIN_SA_FLOW_IRTS);
469 
470 		if (BSA_USB_CMD(BELKIN_SA_SET_FLOW_CTRL_REQUEST, urb_value) < 0)
471 			err("Set flow control error");
472 	}
473 
474 	/* save off the modified port settings */
475 	spin_lock_irqsave(&priv->lock, flags);
476 	priv->control_state = control_state;
477 	spin_unlock_irqrestore(&priv->lock, flags);
478 } /* belkin_sa_set_termios */
479 
480 
481 static void belkin_sa_break_ctl( struct usb_serial_port *port, int break_state )
482 {
483 	struct usb_serial *serial = port->serial;
484 
485 	if (BSA_USB_CMD(BELKIN_SA_SET_BREAK_REQUEST, break_state ? 1 : 0) < 0)
486 		err("Set break_ctl %d", break_state);
487 }
488 
489 
490 static int belkin_sa_tiocmget (struct usb_serial_port *port, struct file *file)
491 {
492 	struct belkin_sa_private *priv = usb_get_serial_port_data(port);
493 	unsigned long control_state;
494 	unsigned long flags;
495 
496 	dbg("%s", __FUNCTION__);
497 
498 	spin_lock_irqsave(&priv->lock, flags);
499 	control_state = priv->control_state;
500 	spin_unlock_irqrestore(&priv->lock, flags);
501 
502 	return control_state;
503 }
504 
505 
506 static int belkin_sa_tiocmset (struct usb_serial_port *port, struct file *file,
507 			       unsigned int set, unsigned int clear)
508 {
509 	struct usb_serial *serial = port->serial;
510 	struct belkin_sa_private *priv = usb_get_serial_port_data(port);
511 	unsigned long control_state;
512 	unsigned long flags;
513 	int retval;
514 	int rts = 0;
515 	int dtr = 0;
516 
517 	dbg("%s", __FUNCTION__);
518 
519 	spin_lock_irqsave(&priv->lock, flags);
520 	control_state = priv->control_state;
521 
522 	if (set & TIOCM_RTS) {
523 		control_state |= TIOCM_RTS;
524 		rts = 1;
525 	}
526 	if (set & TIOCM_DTR) {
527 		control_state |= TIOCM_DTR;
528 		dtr = 1;
529 	}
530 	if (clear & TIOCM_RTS) {
531 		control_state &= ~TIOCM_RTS;
532 		rts = 0;
533 	}
534 	if (clear & TIOCM_DTR) {
535 		control_state &= ~TIOCM_DTR;
536 		dtr = 0;
537 	}
538 
539 	priv->control_state = control_state;
540 	spin_unlock_irqrestore(&priv->lock, flags);
541 
542 	retval = BSA_USB_CMD(BELKIN_SA_SET_RTS_REQUEST, rts);
543 	if (retval < 0) {
544 		err("Set RTS error %d", retval);
545 		goto exit;
546 	}
547 
548 	retval = BSA_USB_CMD(BELKIN_SA_SET_DTR_REQUEST, dtr);
549 	if (retval < 0) {
550 		err("Set DTR error %d", retval);
551 		goto exit;
552 	}
553 exit:
554 	return retval;
555 }
556 
557 
558 static int belkin_sa_ioctl (struct usb_serial_port *port, struct file * file, unsigned int cmd, unsigned long arg)
559 {
560 	switch (cmd) {
561 	case TIOCMIWAIT:
562 		/* wait for any of the 4 modem inputs (DCD,RI,DSR,CTS)*/
563 		/* TODO */
564 		return( 0 );
565 
566 	case TIOCGICOUNT:
567 		/* return count of modemline transitions */
568 		/* TODO */
569 		return 0;
570 
571 	default:
572 		dbg("belkin_sa_ioctl arg not supported - 0x%04x",cmd);
573 		return(-ENOIOCTLCMD);
574 		break;
575 	}
576 	return 0;
577 } /* belkin_sa_ioctl */
578 
579 
580 static int __init belkin_sa_init (void)
581 {
582 	int retval;
583 	retval = usb_serial_register(&belkin_device);
584 	if (retval)
585 		goto failed_usb_serial_register;
586 	retval = usb_register(&belkin_driver);
587 	if (retval)
588 		goto failed_usb_register;
589 	info(DRIVER_DESC " " DRIVER_VERSION);
590 	return 0;
591 failed_usb_register:
592 	usb_serial_deregister(&belkin_device);
593 failed_usb_serial_register:
594 	return retval;
595 }
596 
597 
598 static void __exit belkin_sa_exit (void)
599 {
600 	usb_deregister (&belkin_driver);
601 	usb_serial_deregister (&belkin_device);
602 }
603 
604 
605 module_init (belkin_sa_init);
606 module_exit (belkin_sa_exit);
607 
608 MODULE_AUTHOR( DRIVER_AUTHOR );
609 MODULE_DESCRIPTION( DRIVER_DESC );
610 MODULE_VERSION( DRIVER_VERSION );
611 MODULE_LICENSE("GPL");
612 
613 module_param(debug, bool, S_IRUGO | S_IWUSR);
614 MODULE_PARM_DESC(debug, "Debug enabled or not");
615